JP5736618B2 - Dust collector - Google Patents

Description

  The present invention includes a housing whose interior is partitioned into a supply chamber and an exhaust chamber by a partition wall, and a filtration target gas that is provided in the partition wall and flows in the housing from the supply chamber side to the exhaust chamber side. A filter mechanism for collecting the contained dust, and an injection mechanism for discharging the compressed air discharged from the compressed air supply means in a pulse shape from the exhaust chamber side to the filter mechanism, and for removing the dust collected by the filter mechanism; The present invention relates to a dust collector provided with

Such a dust collector causes the filtration target gas to flow through the housing in a direction from the air supply chamber to the exhaust chamber and collects dust contained in the filtration target gas in the filter mechanism, thereby reducing the filtration target gas. It is to be cleaned. Incidentally, specific examples of the gas to be filtered include, for example, dust-containing air discharged from a blast furnace, an electric furnace, an incinerator, a crushing facility, and the like.
In addition, by using the injection mechanism to inject high-pressure compressed air from the exhaust chamber side into the filter mechanism in a pulsed manner, it is possible to perform a regeneration process for removing dust collected by the filter mechanism and to clean the filter mechanism. It is configured as follows.
In other words, the regenerating process of the filter mechanism with compressed air is repeatedly performed to prevent the filter mechanism from being clogged with dust, thereby maintaining the desired dust collecting capability and relating to the regeneration of the filter mechanism. The period during which the dust collector can be operated without maintenance is extended.

In other words, the plurality of cylindrical filters constituting the filter mechanism are supported by the partition walls in a state where the filter openings at the base ends thereof are arranged in a straight line in a posture facing the exhaust chamber. In addition, the injector pipes whose base ends constituting the injection mechanism are opened and whose tips are blocked are arranged in a row with at least a portion in the direction along the axis along the direction in which the plurality of filter openings are arranged. It arrange | positions in the exhaust chamber in the state which opposes the some filter opening part located in a line. Furthermore, the injector pipe is provided with a plurality of injection holes for injecting compressed air into the plurality of filter openings, arranged in a direction along the axis.
Then, high pressure compressed air is supplied in a pulse shape to the opening end of the injector pipe, and the compressed air is injected from each injection hole of the injector pipe into each cylindrical filter through each filter opening. In this configuration, dust adhering to the cylindrical wall portion of the filter is removed to the air supply chamber side.

By the way, high-pressure compressed air is supplied in a pulse form from the opening end of the injector pipe into the injector pipe for a very short time (for example, about 0.1 to 0.5 seconds). By flowing toward and colliding with the closed end, it flows in the reverse direction (opening end side) and spreads over the entire area of the injector pipe. In this case, most of the velocity energy of the compressed air changes to pressure energy, but since the degree of expansion of the compressed air is weaker toward the opening end, the pressure in the injector pipe is such that the pressure decreases toward the opening end. A pressure distribution of compressed air with a large difference in height occurs.
Accordingly, since the injection hole closer to the opening end of the injector pipe tends to have a smaller injection amount of compressed air, among the plurality of cylindrical filters, the injection amount of compressed air injected to the cylindrical filter closer to the opening end is smaller. As a result, the ability to wipe off dust adhering to the cylindrical filter (hereinafter, sometimes referred to as “wiping off force”) is reduced.
That is, the regeneration degree of the plurality of tubular filters arranged in the direction along the axis of the injector pipe varies in such a form that the regeneration degree becomes smaller as the tubular filter is closer to the opening end of the injector pipe.

Therefore, in the conventional dust collector, the following measures have been taken in order to suppress the variation in the regeneration degree of the plurality of cylindrical filters as described above (see, for example, Patent Document 1).
That is, a plurality of injection holes arranged in the direction along the axis of the injector pipe, with at least one of the opening area and flow resistance of the injection holes and the effective area of the wind receiving wall provided at the inlet of the injection hole as a changing element The changing element is changed from the opening end of the injector pipe to the closing end so as to be uniform so that the amount of compressed air injected from the nozzle becomes uniform.
For example, when the injection hole is constituted by a short pipe (nozzle), the inner diameter of the short pipe is made smaller as the short pipe is closer to the closed end of the injector pipe, or the length of the short pipe is blocked by the injector pipe. The shorter tube near the end was longer.

As another countermeasure, the inner diameter of the injector pipe is decreased from the open end toward the closed end.
For example, the injector pipe is composed of a tapered pipe material whose inner diameter gradually decreases from the open end toward the closed end. Alternatively, the injector pipe is configured in a multi-stage tubular shape in which a plurality of pipe materials having different inner diameters are connected so that the inner diameter becomes smaller from the open end toward the closed end.
Then, in order to reduce variations in the injection amount of compressed air injected into each of the plurality of cylindrical filters from the plurality of injection holes arranged in the direction along the axis of the injector pipe, the axis of the injector pipe is reduced. Variations in the degree of regeneration of the plurality of cylindrical filters arranged in the direction along the direction are suppressed.

JP 7-16413 A

By the way, the regeneration degree of the cylindrical filter does not depend only on the injection amount of the compressed air injected to the cylindrical filter, but also depends on the injection speed of the compressed air. That is, the faster the compressed air injection speed, the greater the force to be removed and the more the degree of regeneration is promoted.
However, in the conventional dust collector, even if the variation in the injection amount of the compressed air from each of the plurality of injection holes arranged in the direction along the axis of the injector pipe is reduced, the height difference is reduced in a form that becomes lower toward the opening end side. The pressure distribution of the compressed air in the injector pipe having a large diameter is not reduced.
That is, even if the injection amount of the compressed air from the injection hole near the opening end increases, the pressure of the compressed air remains low, and the speed of the compressed air injected from the injection hole near the opening end is increased. Since there is no such thing, the wiping-off force is not sufficiently increased, and the regeneration degree of the cylindrical filter close to the opening end of the injector pipe is not sufficiently improved.
Therefore, in the conventional dust collector, the variation in the regeneration degree of the plurality of cylindrical filters arranged in the direction along the axis of the injector pipe cannot be sufficiently suppressed.

  In addition, in order to increase the speed of the compressed air injected from the injection hole near the opening end, the direction along the axial center in the injector pipe is increased by increasing the supply pressure of the compressed air supplied to the injector pipe by the compressed air supply means. It is assumed that the pressure of the compressed air is increased over the entire area. However, in order to increase the supply pressure of the compressed air, it is necessary to replace the compressed air supply means for discharging the compressed air with a high-capacity one, and the injector pipe and the pipe for guiding the compressed air to the injector pipe It is necessary to increase the pressure resistance specifications of the roads, etc., and the amount of compressed air required also increases, which is a great factor in increasing costs and is not a good measure.

Moreover, even if any one of the above-described multiple types of configurations for equalizing the injection amount of the compressed air from the plurality of injection holes arranged in the direction along the axis of the injector pipe is used, the manufacturing cost is high. Therefore, there is a problem that the price of the dust collector becomes high.
For example, when the injection hole is constituted by a short pipe, it is necessary to use a plurality of types of short pipes having different diameters or a plurality of types of short pipes having different lengths. It is necessary to attach the pipe to the injector pipe by welding or the like, which increases the manufacturing cost.
Further, when the injector pipe is formed of a tapered pipe material or is formed in a multistage tubular shape, the material cost and the processing cost are increased, and the manufacturing cost is increased.

  The present invention has been made in view of such circumstances, and its purpose is to sufficiently suppress variations in the degree of regeneration of a plurality of cylindrical filters arranged in the direction along the axis of the injector pipe while reducing the cost. An object of the present invention is to provide a dust collector that can do this.

In order to achieve the above object, a dust collector according to the present invention is provided with a casing that is partitioned into a supply chamber and an exhaust chamber by a partition wall, and provided in the partition wall. A filter mechanism for collecting dust contained in the gas to be filtered flowing from the air chamber side to the exhaust chamber side, and compressed air discharged from the compressed air supply means in a pulse form from the exhaust chamber side to the filter mechanism An injection mechanism that injects and removes dust collected by the filter mechanism, and the filter mechanism includes a plurality of bottomed cylindrical filters, and the plurality of cylindrical filters However, the injection pipe is supported by the partition wall in a state where the filter openings at the base ends face the exhaust chamber, and the injection mechanism is an injector pipe whose base end is open and whose tip is closed. It is configured with its In the exhaust chamber, the injector pipe faces the plurality of filter openings arranged in a row in a posture in which at least a part in the direction along the axial center is aligned with the arrangement direction of the plurality of filter openings. A dust collector in which a plurality of injection holes for injecting the compressed air to each of the plurality of filter openings are arranged in a direction along the axial center in the injector pipe. ,
The injection mechanism stores the compressed air from the compressed air supply means and is connected in a state where the opening end side of the injector pipe communicates with the inside thereof; the opening end of the injector pipe; and the header tank A communication state switching means that can be switched between a communication state for communicating with the inside and a communication cut-off state that does not allow communication with the inside, and the storage of the header tank by the switching of the communication state switching means to the communication state. Configured to inject compressed air from the open end into the injector pipe,
The inner diameter of the injector pipe is constant,
An annular contraction that provides resistance to the flow of the compressed air from the open end of the injector pipe toward the closed end in at least one portion in the portion between the two injection holes adjacent in the direction along the axis in the injector pipe. The diameter portion is provided.

According to the above characteristic configuration, the compressed air injected in a pulse form from the opening end into the injector pipe is provided in at least one place in the portion between the two injection holes adjacent in the direction along the axial center in the injector pipe. The flow is directed toward the closed end while the flow is resisted by the annular reduced diameter portion, and the compressed air that has reached the closed end collides with the closed end and flows in the opposite direction. Therefore, the compressed air in the injector pipe The degree of expansion in the direction along the axial center of the injector pipe is equalized, and the pressure of the compressed air at the opening end side of the annular reduced diameter portion in the injector pipe is increased.
Incidentally, the annular diameter-reduced portion indicates a form having an opening such as a hole having an area smaller than the cross-sectional area of the flow path of the injector pipe.
In other words, most of the velocity energy of the compressed air jetted into the injector pipe is changed to pressure energy, but the degree of expansion of the compressed air in the injector pipe is equalized in the direction along the axis of the injector pipe. At the same time, the pressure of the compressed air in the portion closer to the opening end side than the annular diameter-reduced portion in the injector pipe is increased, and the difference in height of the compressed air in the direction along the axial center in the injector pipe is reduced. . That is, the pressure distribution of the compressed air in the direction along the axis in the injector pipe is reduced. As a result, variations in the injection amount and injection speed of compressed air from the plurality of injection holes arranged in the direction along the axis of the injector pipe are reduced without increasing the supply pressure of the compressed air to the injector pipe by the compressed air supply means. Thus, variations in the regeneration degree of the plurality of cylindrical filters arranged in the direction along the axis of the injector pipe are sufficiently suppressed.
And since it is a simple structure which uses a pipe material with a constant inner diameter as an injector pipe and only provides an annular diameter-reduced portion in the injector pipe, each of the plurality of injection holes arranged in the direction along the axis of the injector pipe Compared to any conventional configuration for equalizing the injection amount of compressed air, the cost can be reduced.

In addition, the communication state switching means is switched to the communication cut-off state, the compressed air is stored in the header tank at a high pressure, and the supply of compressed air from the compressed air supply means to the header tank is cut off. By switching the means to the communication state, a predetermined amount of compressed air stored in the header tank is injected into the injector pipe in a pulsed manner in a very short time, so the consumption of compressed air can be reduced. Thus, the running cost can be reduced.
Accordingly, it is possible to provide a dust collector capable of sufficiently suppressing variations in the degree of regeneration of a plurality of cylindrical filters arranged in the direction along the axis of the injector pipe while reducing the cost and reducing the running cost. Can now.

  According to a further characteristic configuration of the dust collector according to the present invention, the annular reduced diameter portion is provided at one location in the injector pipe, and the position thereof is centered from the open end toward the closed end. In a direction along the direction, from a position separated by a length corresponding to 1/2 of the total length of the pipe, which is the length between the open end and the closed end, to a position separated by a length corresponding to 3/4 of the total length of the pipe It is in the point between.

That is, the inventors of the present invention have intensively studied in order to reduce the pressure distribution of the compressed air in the direction along the axis in the injector pipe. And by setting the installation location of the annular reduced diameter portion in the injector pipe to the position of this characteristic configuration, the height difference of the pressure of the compressed air in the direction along the axial center in the injector pipe can be effectively reduced. The inventors have found that the pressure distribution of compressed air in the injector pipe can be effectively reduced.
First, viewpoints in considering the above points will be described.
Assuming that the opening area of the injection hole is a predetermined area, the faster the speed of the compressed air injected from the injection hole, the greater the wiping force, and the speed of the compressed air injected from the injection hole The higher the pressure of compressed air, the faster. Therefore, the lower limit pressure of the compressed air in the injector pipe necessary to obtain a speed sufficient to sufficiently remove dust adhering to the cylindrical filter is set as a necessary lower limit pressure. When the pressure distribution of the compressed air is such that the pressure of the compressed air becomes the necessary lower limit pressure over almost the entire region in the direction along the axis in the injector pipe, a plurality of cylinders aligned in the direction along the axis of the injector pipe All the filters can be properly reproduced.

On the other hand, it is desired to reduce the supply pressure of compressed air supplied to the injector pipe by the compressed air supply means as much as possible. However, if the supply pressure of the compressed air is too low, the compressed air pressure becomes the necessary lower limit pressure over almost the entire region in the direction along the axial center in the injector pipe even if the annular reduced diameter portion is provided. The pressure distribution cannot be reduced.
By the way, in the state where the annular reduced diameter portion is not provided, the pressure distribution of the compressed air in the direction along the axial center in the injector pipe is a pressure distribution that gradually increases from the opening end toward the closing end. Therefore, as the compressed air supply pressure to be set as low as possible under the condition that the pressure distribution of the compressed air can be reduced so that the pressure of the compressed air becomes the necessary lower limit pressure over almost the entire region in the direction along the axis in the injector pipe. For example, when the annular diameter-reduced portion is not provided, the supply pressure of the compressed air when the following pressure distribution is exhibited as the pressure distribution of the compressed air in the direction along the axial center in the injector pipe is preferable. That is, the pressure distribution of the compressed air is such that the pressure gradually increases from the open end to the closed end, and becomes the necessary lower limit pressure at the approximate center between the open end and the closed end.

  Moreover, if the installation position of the annular reduced diameter portion in the direction along the axial center in the injector pipe is too close to the closed end side, the effect of increasing the pressure of the compressed air in the opening end side portion in the injector pipe is small. Become. Conversely, if the installation position of the annular reduced diameter portion in the direction along the axial center in the injector pipe is too close to the opening end side, the pressure of the compressed air at the closed end side in the injector pipe may be too low. In particular, there is a possibility that the pressure of the compressed air at the portion immediately behind (closed end side) of the annular reduced diameter portion is excessively lowered.

Based on the above viewpoint, the inventors diligently studied the installation position of the annular reduced diameter portion in the direction along the axial center in the injector pipe.
By providing the annular reduced diameter portion, the pressure of the compressed air at the closed end side of the injector pipe in the injector pipe (particularly the portion immediately behind the annular reduced diameter portion) is reduced. However, in order to prevent the pressure from becoming lower than the necessary lower limit pressure, the annular reduced diameter portion has a length corresponding to ½ of the total pipe length in the direction along the axial center from the open end to the closed end in the injector pipe. It has been found that it is necessary to provide on the closed end side from a remote position.
Moreover, in order to raise the pressure of compressed air more than a required minimum pressure over the substantially whole region of the opening end side part rather than the annular diameter reduction part in an injector pipe by providing an annular diameter reduction part, an annular diameter reduction part In the injector pipe, it was found that it is necessary to be provided on the opening end side from a position separated by a length corresponding to 3/4 of the total length of the pipe in the direction along the axial center from the opening end toward the closing end.

That is, in the injector pipe, a position separated from a position corresponding to ½ of the total length of the pipe in a direction along the axial center from the opening end toward the closed end, a length corresponding to 3/4 of the total length of the pipe. An annular diameter-reduced portion is provided at one place between the steps. Then, while reducing the supply pressure of the compressed air to the injector pipe by the compressed air supply means as much as possible, the injector so that the pressure of the compressed air becomes equal to or higher than the necessary lower limit pressure over the entire region in the direction along the axis in the injector pipe. The pressure distribution of the compressed air in the direction along the axis in the pipe can be reduced.
Therefore, by reducing the supply pressure of compressed air to the injector pipe as much as possible, the running cost is reduced as much as possible, and the variation in the degree of regeneration of the multiple cylindrical filters aligned in the direction along the axis of the injector pipe is accurately suppressed. can do.

Further characteristic configuration of the dust collector according to the present invention, the injector pipe is composed of two tubular portions divided in the direction along the axis at the installation location of the annular reduced diameter portion,
The annular reduced diameter portion is constituted by a plate-like annular body having an outer diameter larger than an inner diameter of each of the two tubular portions and a smaller inner diameter,
The annular body is located between the end surfaces of the two tubular portions.

According to the above characteristic configuration, a part of the compressed air injected in a pulse shape from the opening end into the injector pipe collides with the annular portion protruding from the inner surface of the injector pipe to the axial center side in the annular body, thereby opening the opening. It flows to the end side, the remaining part passes through the hole of the annular body, flows toward the closed end side, collides with the closed end, and flows to the annular body side (open end side).
Since the compressed air flows in the injector pipe in such a form, the degree of expansion of the compressed air in the injector pipe is equalized in the direction along the axis of the injector pipe, so that it follows the axis in the injector pipe. Compressed air pressure distribution in the direction is reduced.

And an injector pipe is comprised by the two tubular parts divided in the direction along an axial center in the installation location of an annular reduced diameter part, and the annular body which comprises an annular reduced diameter part is the end surface of each of these two tubular parts. Since it is provided in a state of being sandwiched between them, it is possible to simplify the installation configuration of the annular diameter-reduced portion to the injector pipe, and it is possible to reduce the cost.
Therefore, it is possible to sufficiently suppress the variation in the regeneration degree of the plurality of cylindrical filters arranged in the direction along the axis of the injector pipe while further reducing the price.

  A further characteristic configuration of the dust collector according to the present invention is such that the annular reduced diameter portion extends along the axial center in a portion between two injection holes adjacent in the direction along the axial center in the injector pipe. It exists in the point provided in the position of the said opening end side in the direction along the said axial center rather than the center of a direction or the center.

That is, when the compressed air passes through an opening such as a hole of the annular reduced diameter portion, it tends to go around the closed end side of the annular reduced diameter portion (that is, the rear side of the annular reduced diameter portion). Immediately behind, a vortex portion where the compressed air flows in a vortex is likely to occur.
And if the vortex part is generated so as to overlap the vicinity of the opening end side of the injection hole or above the injection hole, it is affected by the vortex part, and it becomes difficult for the compressed air to be injected from the injection hole. The amount of compressed air injection tends to decrease.
Therefore, the annular diameter-reduced portion is opened at the center between the two injection holes adjacent in the direction along the axis in the injector pipe or in the direction along the axis rather than the center in the direction along the axis. Provided on the side position. Then, even if a vortex portion of compressed air is generated immediately behind the annular reduced diameter portion, the vortex portion can be separated from the injection hole immediately behind the annular reduced diameter portion as much as possible. It can suppress affecting the injection of the compressed air from the injection hole immediately behind the diameter portion.
Therefore, it is possible to reduce the variation in the injection speed of the compressed air from the plurality of injection holes arranged in the direction along the axis of the injector pipe and further reduce the variation in the injection amount. Variations in the degree of regeneration of the plurality of cylindrical filters arranged in the direction along the direction can be further suppressed.

Schematic longitudinal front view of the dust collector according to the embodiment Schematic cross-sectional plan view of the main part of the dust collector according to the embodiment Longitudinal front view of the main part of the dust collector according to the embodiment Longitudinal front view of the main part of the injector pipe showing the installation configuration of the annular body Longitudinal side view of the main part of the injector pipe showing the installation configuration of the annular body Front view of the main part of the injector pipe showing the installation configuration of the annular body The figure which shows the internal pressure distribution of the cylindrical filter in the direction in alignment with the axial center of the injector pipe in the dust collector which concerns on embodiment. The figure which shows the internal pressure distribution of the cylindrical filter in the direction in alignment with the axial center of the injector pipe in the dust collector which concerns on another embodiment. The figure which shows the comparative example of the internal pressure distribution of the cylindrical filter in the direction in alignment with the axial center of an injector pipe

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1 and FIG. 2, the dust collector includes a housing 1 that is partitioned into a supply chamber 2 and an exhaust chamber 3 by a partition wall 4, and the partition wall 4. A filter mechanism F that collects dust contained in dust-containing air G (an example of gas to be filtered) that flows from the air supply chamber 2 side to the exhaust chamber 3 side, and an air compressor 6 (an example of compressed air supply means) ) From the exhaust chamber 3 side through the filter mechanism F and ejected in the form of pulses to the air supply chamber 2 side to remove dust collected in the filter mechanism F; It is configured with.

As shown in FIGS. 1 to 3, the filter mechanism F is configured to include a plurality of bottomed cylindrical tubular filters 5, and the plurality of cylindrical filters 5 are respectively filters at the base ends. The openings 5w are supported by the partition walls 4 in a state where the openings 5w face the exhaust chamber 3 and are arranged in a straight line.
The injection mechanism J includes an injector pipe 11 having a base end opened and a tip closed, and the injector pipe 11 has at least a part of the plurality of filter openings in the direction along the axis A. It is disposed in the exhaust chamber 3 so as to face the plurality of filter openings 5w arranged in a row in a posture along the 5w alignment direction.
As shown in FIG. 3, the injector pipe 11 is provided with a plurality of injection holes 12 for injecting compressed air H into the plurality of filter openings 5 w in a direction along the axis A.

In this embodiment, as shown in FIG. 2, the filter mechanism F moves the filter row Fr in which the plurality of cylindrical filters 5 are arranged in a straight row into the arrangement direction of the plurality of cylindrical filters 5 in the filter row Fr. The injection mechanism J is configured to include a plurality of injector pipes 11 in a state corresponding to each of the plurality of filter rows Fr.
Further, the dust collector includes a pressure difference detection unit (not shown) that detects a pressure difference between the inside and the outside of the cylindrical filter 5, and a control that controls the operation of the dust collector such as the operation of the injection mechanism J. A part 21 and the like are also provided.

As shown in FIGS. 1 to 3, in the present invention, the compressed air H from the air compressor 6 is stored and connected to the injection mechanism J in a state where the open end 11 w side of the injector pipe 11 communicates with the inside. Diaphragm that can be switched between a header tank 13, a valve opening state (an example of a communication state) in which the opening end 11 w of the injector pipe 11 communicates with the inside of the header tank 13, and a valve closing state (an example of a communication cut-off state) in which communication is not established. Valve 14 (an example of a communication state switching means), and the compressed air H stored in the header tank 13 is injected into the injector pipe 11 from the opening end 11w by switching the diaphragm valve 14 to the open state. It is configured as follows.
In addition, the injector pipe 11 is configured in a straight tube shape in which the axis A is linear and the inner diameter and outer diameter are constant over the entire length from the open end 11w to the closed end 11s.
Furthermore, an annular shape that provides resistance to the flow of compressed air H from the open end 11w of the injector pipe 11 toward the closed end 11s at at least one location in the direction along the axis A in the injector pipe 11 (in this embodiment, one location). A reduced diameter portion R is provided.
In this embodiment, each of the plurality of injector pipes 11 is provided with an annular reduced diameter portion R.

Next, each part of the dust collector will be described.
As shown in FIG. 1 and FIG. 2, the housing 1 is provided on the partition wall 4 at the upper part, the interior of the casing 1 is partitioned in the vertical direction by the partition wall 4, and the dust-containing air G is supplied to the lower part. An exhaust chamber 3 through which the purified air C purified by the cylindrical filter 5 flows is formed. The casing 1 is formed so that the outer shape of the location where the cylindrical filter 5 in the air supply chamber 2 is arranged and the location where the exhaust chamber 3 is formed is substantially rectangular in top view, and the cylindrical filter 5 in the air supply chamber 2 is arranged. The outer shape of the lower side of the portion to be formed is formed in a funnel shape.

And the dust containing air introduction path 7 which introduces the dust containing air G from an incinerator etc. (not shown) into the air supply chamber 2 is connected to the upper end part formed in the funnel shape of the housing | casing 1, A purified air discharge path 8 for discharging the purified air C purified by the cylindrical filter 5 from the discharge chamber 3 is connected to an upper portion formed in a rectangular shape of the housing 1. A suction device (not shown) is provided on the downstream side of the purified air discharge path 8 so that the purified air C in the exhaust chamber 3 can be sucked into the external space. A discharge port 9 is formed at the lower end of the funnel-shaped portion of the housing 1 and a rotary valve 10 is provided at the discharge port 9, which is obtained by regenerating the cylindrical filter 5 described later. It is comprised so that the dust etc. in the air supply chamber 2 which were produced can be discharged | emitted.
Accordingly, the dust-containing air G generated in an incinerator or the like (not shown) is introduced into the air supply chamber 2 through the dust-containing air introduction path 7 by the suction force of the suction device (not shown), and the cylindrical filter 5 As a result, the dust is collected and becomes purified air C, which is discharged from the exhaust chamber 3 through the purified air discharge path 8 to the external space connected to the downstream side of the dust collector.

  Although the detailed illustration is omitted, the cylindrical filter 5 has a bottomed cage shape (for example, a bottomed cylindrical cage shape in which a plurality of linear rods are attached to a plurality of ring-shaped frames formed in an annular shape. As a bag filter in which a bag-like (bottomed tubular) bug (not shown) configured to allow the passage of dust-containing air G is covered outside a support body (not shown) formed in It is configured. The bug is composed of a filter cloth that can satisfactorily collect dust in the dust-containing air G. For example, a base cloth formed by a non-woven fabric attached on the outside of the cloth with a cloth inside, or a non-woven cloth or woven cloth, etc. Consists of. The material of the filter cloth is made of synthetic fiber or glass fiber. The lower portion of the bag is bag-shaped, the upper opening is a filter opening 5w, and the upper end of the bug is sandwiched and fixed between the support and the partition wall 4. Incidentally, the length in the direction along the axial center of each cylindrical filter 5 is, for example, about 1 to 12 meters (m), and the inner diameter of each cylindrical filter 5 is, for example, about 100 to 164 mmφ.

Each cylindrical filter 5 is attached to the partition wall 4 in a suspended state with a filter opening 5w formed at the upper end as shown in FIGS.
In this embodiment, 16 cylindrical filters 5 are arranged in a line at equal intervals in a linear filter arrangement direction (left and right direction in FIGS. 1 and 2) to form a filter array Fr. The filter rows Fr of the rows are arranged at equal intervals in a direction orthogonal to the filter arrangement direction (a direction orthogonal to the paper surface of FIG. 1, the vertical direction of FIG. 2), and 256 cylindrical filters 5 are provided. . It should be noted that the number of cylindrical filters 5 constituting the filter row Fr, the number of filter rows Fr arranged, the shape of the bug, and the like can be appropriately changed in relation to the amount of dust processing.

As shown in FIGS. 1 to 3, the injector pipe 11 has an end on the opening end 11 w side projecting outward from the side wall of the housing 1, and the remaining portion has 16 filter openings as described above. Each of the 16 rows of filter rows Fr is positioned in the exhaust chamber 3 so as to face the 16 filter openings 5w arranged in a row in a lateral orientation along the arrangement direction of the portions 5w. Arranged.
In this embodiment, as shown in FIGS. 4 to 6, the injection hole 12 is configured by circular perforations formed in the injector pipe 11, and the opening edge portion of each injection hole 12 is subjected to burring processing. The ring-shaped rising portion 12t is provided so as to protrude outward in the radial direction of the injector pipe 11.
That is, each injector pipe 11 is provided with 16 injection holes 12 at equal intervals so as to correspond one-to-one to the filter openings 5 w of the cylindrical filter 5.
Each injection hole 12 is provided in the injector pipe 11 so that the center of each injection hole 12 is located at the approximate center of each filter opening 5w when viewed in the direction along the axis of each cylindrical filter 5. Yes.
And since the spreading | diffusion of the compressed air H injected from the injection hole 12 is suppressed by the ring-shaped rising part 12t of the opening edge part of the injection hole 12, the filter opening part of each cylindrical filter 5 from each injection hole 12 When compressed air H is injected at 5w, leakage of compressed air H to the outside is sufficiently suppressed.

Next, a specific configuration of the annular reduced diameter portion R and a mounting configuration of the annular reduced diameter portion R with respect to the injector pipe 11 will be described based on FIGS.
As shown also in FIG. 3, in this embodiment, the installation position of the annular reduced diameter portion R is between the tenth injection hole 12 and the eleventh injection hole 12 from the opening end 11 w side in the injector pipe 11. Is set at the center in the direction along the axis A.
In addition, the injector pipe 11 is composed of two tubular portions 11p separated in the direction along the axis A at the installation location of the annular reduced diameter portion R, and the annular reduced diameter portion R is outside the inner diameter of the tubular portion 11p. A plate-like annular body 18 having a large diameter and a small inner diameter (diameter of the hole 18h) is used. Incidentally, the outer diameter of the annular body 18 is substantially the same as the outer diameter of the tubular portion 11p. Further, the hole 18 h of the annular body 18 is provided concentrically with a circle forming the outer periphery of the annular body 18.
The annular body 18 is sandwiched between the end surfaces of the two tubular portions 11p.
When the structure for sandwiching the annular body 18 between the end faces of the two tubular portions 11p is described, as shown in FIGS. 4 and 6, the annular body 18 is disposed on the radially outer side in the thickness direction. A thin-walled portion 18 t that is thinned from both sides is formed in an annular shape over the entire circumference of the annular body 18. The width of the thin portion 18t in the radial direction is substantially the same as the thickness of the tube wall of the tubular portion 11p. In the state where the annular body 18 is disposed between the end surfaces of the two tubular portions 11p, the two groove portions formed between the thin-walled portion 18t of the annular body 18 and the end surfaces of the tubular portions 11p, respectively. By filling the welding material 20, the annular body 18 is welded between the two tubular portions 11p.

As shown in FIGS. 1 to 3, one header tank 13 is provided for the 16 injector pipes 11, and a diaphragm valve 14 is provided for each of the 16 injector pipes 11.
That is, as shown in FIG. 3, the end of the 16 injector pipes 11 on the opening end 11 w side is provided in a state of entering the inside of the header tank 13, and each diaphragm valve 14 is switched to the open state. When the opening end 11w of the injector pipe 11 communicates with the header tank 13 and is switched to the valve-closed state, the communication between the opening end 11w of the injector pipe 11 and the header tank 13 is cut off.
A storage pressure detector 15 that detects the pressure of the compressed air H in the header tank 13 is provided.

Since the structure and operation of the diaphragm valve 14 are well known, they will be briefly described with illustration and detailed description omitted.
The diaphragm valve 14 includes a pressure chamber that applies a back pressure to the diaphragm, and an electromagnetic valve that opens and closes an exhaust passage that exhausts the pressure chamber. When the solenoid valve is closed, the primary pressure (pressure in the header tank 13) is guided to the pressure chamber through the communication hole, the pressure of the pressure chamber is applied to the diaphragm, and the valve body attached to the diaphragm is moved to the valve seat. The diaphragm valve 14 is closed. On the other hand, when the solenoid valve is in an open state, the pressure in the pressure chamber is reduced and lowered, the diaphragm is pushed by the primary pressure (pressure in the header tank 13), and the valve body attached to the diaphragm is separated from the valve seat, The diaphragm valve 14 is opened.
That is, the diaphragm valve 14 is switched between the open state and the closed state by the opening / closing operation of the electromagnetic valve.

As shown in FIG. 1, the air compressor 6 and the header tank 13 are connected by a compressed air supply path 16, and the compressed air H discharged from the air compressor 6 is supplied to the header tank 13. Yes. The compressed air supply path 16 is provided with a compressed air interrupting valve 17 for intermittently supplying the compressed air H to the header tank 13.
Then, the control unit 21 opens the compressed air intermittent valve 17 at a predetermined regeneration timing at which regeneration of the tubular filter 5 needs to be performed, and the compression in the header tank 13 detected by the stored pressure detector 15 is performed. When the pressure of the air H reaches a predetermined target storage pressure, the compressed air intermittent valve 17 is closed.
That is, the compressed air H from the air compressor 6 is stored in the header tank 13 at the target storage pressure.
Incidentally, in this embodiment, the target storage pressure is set to 0.2 MPa, for example.

Subsequently, when the pressure in the header tank 13 detected by the storage pressure detector 15 reaches a predetermined target storage pressure, the control unit 21 closes the compressed air intermittent valve 17 to provide 16 diaphragms. A predetermined one of the valves 14 is configured to open for a preset regeneration time. Incidentally, the set regeneration time is set to a time slightly longer than the time required for substantially the entire amount of the compressed air H stored in the header tank 13 to be injected from the injection hole 12 of the injector pipe 11.
That is, when the diaphragm valve 14 is opened, the compressed air intermittent valve 17 is closed, so that the supply of the compressed air H from the air compressor 6 to the header tank 13 is cut off. The high-pressure compressed air H stored in 13 is injected in pulses from 16 injection holes 12 provided in the injector pipe 11 through the injector pipe 11.
Incidentally, in this embodiment, the set reproduction time is set to a time between about 0.1 to 0.5 seconds, for example.

In this embodiment, the inner diameter of the injector pipe 11 is about 114.3 mmφ. The pitch at the center of the injection holes 12 is about 167 mm.
The total length of the injector pipe 11 (the length between the open end 11w and the closed end 11s) is about 3200 to 3500 mm.
The distance between the opening end 11w and the center of the injection hole 12 on the opening end 11w side is about 650 to 1000 mm, and the distance between the closing end 11s and the center of the injection hole 12 on the closing end 11s side is 60 to 90 mm.
In the injector pipe 11, the center between the open end 11w and the closed end 11s is a position corresponding to the vicinity of the installation position of the seventh injection hole 12 from the open end 11w. Further, in the injector pipe 11, it corresponds to 3/4 of the total length of the pipe, which is the length between the open end 11w and the closed end 11s in the direction along the axis A from the open end 11w to the closed end 11s. The position apart from the length is a position corresponding to the vicinity of the installation position of the twelfth injection hole 12 from the opening end 11w.
That is, in this embodiment, the annular reduced diameter portion R is provided at one place in the injector pipe 11, and the position of the pipe is the entire length of the pipe in the direction along the axis A from the open end 11w toward the closed end 11s. The distance between the position corresponding to 1/2 and the position spaced apart corresponding to 3/4 of the total length of the pipe.

The inner diameter of the annular body 18 is about 84 mmφ. That is, in this embodiment, the opening area reduction ratio of the injector pipe 11 by the annular body 18 (ratio of the area of the opening portion (hole 18h) of the annular body 18 to the area of the opening portion in the cross section of the injector pipe 11) is 0. .54 or so.
Further, when the injector pipe 11 is disposed above each filter row Fr with respect to each filter row Fr, the distance between the injector pipe 11 and the filter opening 5w of the cylindrical filter 5 is, for example, 100 to It is about 250 mm.

  Moreover, the capacity | capacitance which can store the compressed air H in the header tank 13 is about 34.3 liters. In addition, the capacity | capacitance which can store the compressed air H in the header tank 13 from the capacity | capacitance of the header tank 13 to the volume of the protrusion part to the header tank 13 of the 16 injector pipes 11, and the header tank 13 in the diaphragm valve 14 It is the volume obtained by subtracting the volume of the portion located.

  The control unit 21 includes a central processing unit (CPU), a memory, a storage unit, and the like (not shown), and includes known information processing means that can execute a predetermined program and process information by the CPU. And configured to be able to control the operation of the dust collector.

The pressure difference detection unit includes a known pressure detection unit, and is provided in the dust-containing air introduction path 7 and is a first pressure detection unit (not shown) that detects the pressure outside the cylindrical filter 5 (air supply chamber 2 side). ) And a second pressure detection unit (not shown) that detects the pressure inside the tubular filter 5 (exhaust chamber 3 side), and is provided in the exhaust chamber 3, and includes the first pressure detection unit and the second pressure detection unit. The internal / external differential pressure of the cylindrical filter 5 can be detected based on the detected pressure from the pressure detector. The detected internal / external differential pressure of the cylindrical filter 5 is configured to be output to the control unit 21.
In addition, a predetermined pressure difference serving as a reference for determining that dust has adhered to the outside of the cylindrical filter 5 and the dust cannot be collected efficiently is preset as a regeneration start differential pressure. That is, the internal / external pressure difference of the cylindrical filter 5 is a pressure loss of the dust-containing air G flowing from the outside to the inside of the cylindrical filter 5, whereas the regeneration start differential pressure is It is set as the value of pressure loss when regeneration is required. Note that the regeneration start differential pressure is stored in the storage unit of the control unit 21 in advance.
The purified air discharge path 8 is provided with a known flow rate detection unit (not shown) for detecting the flow rate of the purified air C discharged from the exhaust chamber 3 to the external space, and the detected flow rate is controlled by the control unit. It is comprised so that it may output to 21.

Next, the control operation of the control unit 21 will be described.
In the dust collection operation of the dust collector, the control unit 21 starts suction by a suction device (not shown) connected to the downstream side of the purified air discharge path 8 and connects to the upstream side of the dust-containing air introduction path 7. Dust-containing air G is introduced into the air supply chamber 2 in the housing 1 from an incinerator or the like (not shown). As a result, the dust-containing air G is allowed to flow from the air supply chamber 2 side to the exhaust chamber 3 side via the cylindrical filter 5 (from the outside to the inside of the cylindrical filter 5), and the dust in the dust-containing air G is discharged. The dust is collected by the bug of the cylindrical filter 5 and the dust-containing air G is purified and treated as purified air C. In this dust collection operation, the collected dust adheres to the outside of the bug of the cylindrical filter 5. In the dust collection operation, the control unit 21 monitors information on the internal and external differential pressures inside and outside the cylindrical filter 5 from the pressure difference detection unit (the first pressure detection unit and the second pressure detection unit). Further, in the dust collection operation, the control unit 21 detects the flow rate of the purified air C discharged from the purified air discharge path 8 with the flow rate detection unit, and the suction device so that the detected flow rate becomes a predetermined flow rate. Etc. (not shown) are controlled.
Thereby, the dust in the dust-containing air G can be collected by the cylindrical filter 5 and the dust-containing air G can be purified well to be purified air C.

On the other hand, when this dust collection operation is continued, dust adhering to the outside of the cylindrical filter 5 increases, and dust adheres to the outside of the bug and the inside of the fiber. In such a state, pressure loss occurs in the cylindrical filter 5 and it is difficult to efficiently collect dust. Therefore, the control unit 21 detects the fact that such a dust layer is formed and the regeneration timing is reached, and the cylindrical filter detected by the pressure difference detection unit (the first pressure detection unit and the second pressure detection unit). 5 is recognized as a regeneration start differential pressure, and it is determined that regeneration of the cylindrical filter 5 is necessary.
In such a state, the regeneration operation of the cylindrical filter 5 is performed in a state where the dust collection operation is performed (a state where dust is collected).

In the regeneration operation, the control unit 21 opens the compressed air intermittent valve 17 and closes the compressed air intermittent valve 17 when the pressure in the header tank 13 detected by the stored pressure detector 15 reaches the target stored pressure. At the same time, the control for opening any one of the 16 diaphragm valves 14 during the set regeneration time is sequentially executed for each of the 16 diaphragm valves 14 one by one.
Then, since the compressed air H of high pressure (for example, 0.2 MPa) is stored in the header tank 13, the compressed air H is extremely short (for example, for example, as the diaphragm valve 14 is opened). 0.1 to 0.5 second) is injected into the specific injector pipe 11 from the opening end 11w in a pulse shape and flows through the injector pipe 11 at a very high speed (about the sound speed). From the injection hole 12, it injects in the form of a pulse in each cylindrical filter 5 through each filter opening part 5w.

At this time, a part of the compressed air H injected in a pulse shape into the injector pipe 11 from the opening end 11 w toward the closed end 11 s projects from the inner surface of the injector pipe 11 in the annular body 18 toward the axial center side. It collides with the portion and flows toward the open end 11w, and the remaining portion passes through the hole 18h of the annular body 18 and further flows toward the closed end 11s, collides with the closed end 11s, and flows into the annular body 18 side (open end 11w). Side).
And, since the compressed air H flows in the injector pipe 11 in such a form, the degree of expansion of the compressed air H in the injector pipe 11 is equalized in the direction along the axis A of the injector pipe 11. The pressure distribution of the compressed air H in the direction along the axis A in the injector pipe 11 is reduced.
And the annular body 18 is provided in the center of the direction in alignment with the axial center A between the two injection holes 12 adjacent in the direction in alignment with the axial center A in the injector pipe 11. FIG. As a result, even if a swirl of compressed air H is generated immediately behind the annular body 18 (closed end 11s side), the injection hole 12 immediately behind the annular body 18 (closed end 11s side) is moved away from the swirl part. Since they can be separated, the influence of the swirl portion on the injection of the compressed air H from the injection hole 12 immediately behind the annular body 18 (closed end 11s side) can be suppressed.
Therefore, the variation in the injection amount of the compressed air H from the plurality of injection holes 12 of the injector pipe 11 is suppressed, and the variation in the injection speed of the compressed air H from the plurality of injection holes 12 is also suppressed. 11 can sufficiently suppress variations in the degree of regeneration of the plurality of cylindrical filters 5 arranged in the direction along the axis A.

Next, based on FIG. 7 and FIG. 9, the result of verifying that the pressure distribution of the compressed air H in the direction along the axis A in the injector pipe 11 can be reduced by providing the annular body 18 as described above. Will be explained.
7 and 9 show the internal pressure of the 16 cylindrical filters 5 arranged in the direction along the axis A of the injector pipe 11 (pressure at a position 4 meters (4 m) downward from the filter opening 5w). ) (Hereinafter may be referred to as a filter internal pressure distribution in a direction along the axis A of the injector pipe 11). The filter internal pressure distribution is along the axis A in the injector pipe 11. The pressure distribution of the compressed air H in the direction is reflected. Therefore, the pressure distribution of the compressed air H in the direction along the axis A in the injector pipe 11 is the same as the filter internal pressure distribution shown in each of FIGS. 7 and 9, although the actual pressure value is different.

7 and FIG. 9, the horizontal axis indicates the arrangement position of each of the 16 cylindrical filters 5 in the direction along the axis A of the injector pipe 11. That is, the numbers indicating the first, second,..., Fifteenth and sixteenth order from the open end 11w are added to the code “5” indicating the cylindrical filter as a subscript, so that 16 The arrangement | positioning position from the opening end 11w of the injector pipe 11 in each cylindrical filter 5 is shown. For example, “5 ₋₁₀ ” indicates a position where the tenth cylindrical filter 5 from the opening end 11 w is disposed, and “5 ₋₁₁ ” indicates that the eleventh cylindrical filter 5 is disposed from the opening end 11 w. Indicates the position.

Further, the arrangement form of the 16 injection holes 12 in the direction along the axis A of the injector pipe 11 corresponds to the arrangement form of the 16 cylindrical filters 5 in the direction along the axis A of the injector pipe 11. . Therefore, the numbers indicating the first, second,..., Fifteenth and sixteenth order from the opening end 11w are added to the reference numeral “12” indicating the injection hole 12 by a subscript. The arrangement position from the opening end 11 w of the injector pipe 11 in each of the injection holes 12 is shown corresponding to each cylindrical filter 5. For example, “12 ₋₁₀ ” indicates a position where the tenth injection hole 12 from the opening end 11 w is disposed, and “12 ₋₁₁ ” indicates the eleventh injection hole 12 from the opening end 11 w. Indicates the position.

By the way, the lower limit pressure of the compressed air H in the injector pipe 11 necessary to obtain the speed of the compressed air H that can sufficiently remove dust adhering to the cylindrical filter 5 is set as the required lower limit pressure. . Then, in order to enable the regeneration of the 16 cylindrical filters 5 arranged in the direction along the axis A of the injector pipe 11 to be performed appropriately, the entire area in the direction along the axis A in the injector pipe 11 is substantially the same. It is necessary to make the pressure of the compressed air H over the necessary lower limit pressure.
Accordingly, the internal pressure of the cylindrical filter 5 corresponding to the necessary lower limit pressure in the injector pipe 11 (may be referred to as the necessary lower limit internal pressure of the cylindrical filter 5) is set as K, and each of FIGS. Shown in In other words, in order to properly regenerate all the 16 tubular filters 5 arranged in the direction along the axis A of the injector pipe 11, the internal pressure of all the 16 tubular filters 5 is as low as possible. The internal pressure is preferably set to K or higher.
The vertical width of the internal pressure value of each cylindrical filter 5 shown in each of FIGS. 7 and 9 corresponds to the width of the lower limit value and the upper limit value of the five actual measurement values. Further, the horizontal line between the lower limit value and the upper limit value of the internal pressure value of each cylindrical filter 5 is a median value of five actual measurement values.

FIG. 9 shows the filter internal pressure distribution in the direction along the axis A of the injector pipe 11 when the annular body 18 is not provided.
As shown in FIG. 9, when the annular body 18 is not provided, the filter internal pressure distribution in the direction along the axis A of the injector pipe 11 gradually increases from the opening end 11w of the injector pipe 11 toward the closing end 11s. The required lower limit internal pressure in the vicinity of the center between the open end 11w and the closed end 11s (corresponding to the arrangement position of the seventh cylindrical filter 5 (seventh injection hole 12) from the open end 11w in this embodiment) The pressure distribution is in the form of K. That is, the internal pressures of most of the first to seventh cylindrical filters 5 are lower than the required lower limit internal pressure K.
Accordingly, the pressure distribution of the compressed air H in the direction along the axis A of the injector pipe 11 gradually increases from the opening end 11w of the injector pipe 11 toward the closing end 11s, and between the opening end 11w and the closing end 11s. The pressure distribution is in the form of the required lower limit pressure in the vicinity of the center (corresponding to the installation position of the seventh injection hole 12 from the opening end 11w in this embodiment).

7, as in the above embodiment, the annular body 18 is provided at the center in the direction along the axis A at the portion between the tenth injection hole 12 and the eleventh injection hole 12 from the opening end 11w. The filter internal pressure distribution in the case is shown. That is, the annular body 18 is 3 in the injector pipe 11 from a position separated by a length corresponding to ½ of the total pipe length in the direction along the axis A from the open end 11w to the closed end 11s. It is provided at a position separated by a length corresponding to / 4.
For all the 16 tubular filters 5 arranged in the direction along the axis A of the injector pipe 11, the internal pressure can be made higher than the necessary lower limit internal pressure K. That is, the open end of the injector pipe 11 is more open than the annular body 18 while avoiding the pressure of the compressed air H in the portion closer to the closed end 11 s than the annular body 18 in the injector pipe 11 being lower than the necessary lower limit pressure. The pressure of the compressed air H in the portion on the 11w side can be increased so as to be approximately equal to or higher than the necessary lower limit pressure. As a result, the pressure distribution of the compressed air H in the direction along the axis A in the injector pipe 11 can be sufficiently reduced.

[Another embodiment]
(A) The specific configuration of the annular reduced diameter portion R is not limited to the annular body 18 exemplified in the above embodiment.
(A-1) When the annular diameter-reduced portion R is constituted by the annular body 18, the opening area reduction rate of the injector pipe 11 by the annular body 18 is not limited to 0.54 exemplified in the above embodiment. Absent. For example, in the injector pipe 11 according to the inner diameter and length of the injector pipe 11, the number of injection holes 12, the hole diameter, the storage pressure of the compressed air H in the header tank 13, the storage capacity of the compressed air H in the header tank 13, etc. Can be appropriately set so that the pressure distribution of the compressed air H can be reduced as desired (conditions in which the minimum pressure is equal to or higher than the lower limit pressure).
(A-2) When the annular diameter-reduced portion R is constituted by the annular body 18, in the above embodiment, the hole 18 h of the annular body 18 is provided concentrically with a circle that forms the outer periphery of the annular body 18. However, the hole 18 h of the annular body 18 may be provided so as to be shifted from the center of the circle forming the outer periphery of the annular body 18. In this case, for example, if the annular body 18 is provided in the injector pipe 11 with the hole 18 h approaching the injection hole 12, the swirl of the compressed air H formed immediately behind the annular body 18 is reduced. be able to.
(A-3) The annular reduced diameter portion R may be formed of a cylindrical body whose length in the direction along the axis is shorter than the interval between the adjacent injection holes 12. In this case, a straight tubular cylinder whose inner diameter is smaller than the inner diameter of the injector pipe 11 and constant in the direction along the axis may be used, or a tapered tubular body whose inner diameter gradually decreases from the proximal end toward the distal end. But it ’s okay.

(B) When the injector pipe 11 is configured in the same manner as in the above-described embodiment, and the annular reduced diameter portion R is also configured by the annular body 18 similar to that in the above-described embodiment, the injector pipe 11 extends along the axis A in the injector pipe 11. The installation position of the annular body 18 in the direction is not limited to the position illustrated in the above embodiment, and can be variously changed.
For example, you may provide in the part by the side of the opening end 11w rather than the center between the opening end 11w and the obstruction | occlusion end 11s.
FIG. 8 shows a filter internal pressure distribution when the annular body 18 is provided in a portion between the sixth injection hole 12 and the seventh injection hole 12 as a specific example in this case. The description conditions in FIG. 8 are the same as the description conditions in FIGS. 7 and 9 described in the above embodiment.
As shown in FIG. 8, in this case, the internal pressure of the cylindrical filter 5 on the opening end 11 w side of the annular body 18 in the direction along the axis A of the injector pipe 11 is higher than the necessary lower limit internal pressure K. Can be raised. However, only the tubular filter 5 (seventh tubular filter 5 from the opening end 11w) immediately behind the annular body 18 (closed end 11s side) has an internal pressure that is too low and is slightly lower than the necessary lower limit internal pressure K. Become.
That is, the pressure of the compressed air H is slightly lower than the required lower limit pressure only at the portion immediately behind the annular body 18 (closed end 11 s side), but on the opening end 11 w side of the annular body 18 in the injector pipe 11. The pressure of the compressed air H in the portion can be increased so as to be equal to or higher than the necessary lower limit pressure.
Therefore, the compressed air H in the direction along the axis A in the injector pipe 11 can be sufficiently suppressed so that the variation in the regeneration degree of the plurality of cylindrical filters 5 arranged in the direction along the axis A of the injector pipe 11 can be sufficiently suppressed. Pressure distribution can be reduced.

Further, the annular body 18 is placed in the injector pipe 11 at a portion closer to the closed end 11s than the twelfth injection hole 12 (that is, in the injector pipe 11, from the open end 11w to the closed end 11s in the axial center A). You may provide in the direction along the direction of the closed end 11s side from the position away from the length corresponding to 3/4 of pipe full length.
However, in order to reduce the pressure distribution of the compressed air H in the injector pipe 11 as much as possible, the installation position of the annular body 18 in the direction along the axis A in the injector pipe 11 is the opening end 11w in the injector pipe 11. In the direction along the axis A toward the closed end 11s from a position separated by a length corresponding to 1/2 of the total length of the pipe to a position separated by a length corresponding to 3/4 of the total length of the pipe It is preferable to set.

(C) In the above embodiment, the annular reduced diameter portion R is provided at one location in the direction along the axis A in the injector pipe 11, but it may be provided at two or more locations. In this case, the opening area reduction ratio of the injector pipe 11 by the annular reduced diameter portion R (ratio of the area of the opening portion of the annular reduced diameter portion R to the area of the opening portion in the cross section of the injector pipe 11) is the closed end 11s side. It is preferable to increase the diameter of the annular reduced diameter portion R.

(D) The hole diameters of the plurality of injection holes 12 arranged in the direction along the axis A of the injector pipe 11 may all be the same, or may be different, for example, in a state of becoming larger toward the opening end 11w side.

(E) In the portion between the two injection holes 12 adjacent in the direction along the axis A in the injector pipe 11, the installation position of the annular reduced diameter portion R is the position exemplified in the above embodiment, that is, the shaft The position is not limited to the center in the direction along the center A, and may be a position closer to the opening end 11w in the direction along the axis A than the center in the direction along the axis A.

(F) The specific configuration of the injection hole 12 is not limited to the case where the injection hole 12 is configured by perforation formed in the injector pipe 11 as in the above embodiment. For example, you may comprise by the cylindrical body attached to the tube wall of the injector pipe 11 in the state connected to the inside.

(G) Inner diameter and length of the injector pipe 11, the number of injection holes 12 installed in the direction along the axis A, the diameter of the injection holes 12, the distance between the two injection holes 12 adjacent in the direction along the axis A, etc. The specification of the injector pipe 11 is not limited to the specification described in the above embodiment. It can be appropriately changed according to the arrangement form (number, pitch, etc.) of the plurality of cylindrical filters 5 arranged in a line.
The capacity of the header tank 13 depends on the inner diameter and length of the injector pipe 11, the number of injection holes 12 installed in the direction along the axis A, the hole diameter of the injection holes 12, and the like. It is set as small as possible under the condition that the pressure distribution of H can be reduced as desired.

(H) The structure for providing the annular body 18 in the injector pipe 11 is not limited to the structure illustrated in the above embodiment.
For example, the two tubular portions 11p are arranged in a state where the annular body 18 is sandwiched between the respective end faces, and an annular connecting ring whose inner diameter is slightly larger than the outer diameter of the tubular portion 11p is provided in the two tubular portions 11p. It fits outside in the state straddled, and in that state, the connecting ring and each tubular portion 11p may be welded.

(I) In the case where a plurality of cylindrical filters 5 are arranged in a row, the interval between the cylindrical filters 5 is not limited to the case of equal intervals as in the above embodiment, and may be varied. .

(J) The arrangement position of each of the plurality of injection holes 12 with respect to each of the plurality of filter openings 5w as viewed in the direction along the axis of the cylindrical filter 5 is the same for all the injection holes 12 as illustrated in the above embodiment. In addition, the present invention is not limited to the case where the center of the injection hole 12 is located at the approximate center of the filter opening 5w. For example, if the configuration is such that the compressed air H injected from the injection hole 12 flows well into the filter opening 5w arranged oppositely, a part of the plurality of injection holes 12 is located at the center of the injection hole 12. The arrangement may be such that the arrangement is shifted from the center of the filter opening 5w, or the arrangement position with respect to the filter opening 5w may be different for each of the plurality of injection holes 12w.

(K) In the above-described embodiment, the injector pipe 11 is a straight tube with the axial center A extending straight from the open end 11w to the closed end 11s, but the shape of the injector pipe 11 is such that the inner diameter is constant. It can be changed as appropriate. For example, the injector pipe 11 may be formed in a bifurcated shape that is branched in such a manner that the axial centers A of the two branch pipe portions intersect. The bifurcated injector pipe 11 includes a plurality of filters arranged in a row in a posture in which each of the two branch pipe portions is aligned with the arrangement direction of the plurality of filter openings 5w in each of the two filter rows Fr. You may arrange | position in the state opposed to the opening part 5w. In this case, the diaphragm valve 14 is provided at the opening end 11w common to the two branch pipe portions in the bifurcated injector pipe 11, and the two filter rows Fr are simultaneously regenerated. In this case, the total length of the injector pipe 11 is the length of the path in the injector pipe 11 from the open end 11w to the closed end 11s of each branch pipe portion along the axis A.
Alternatively, the injector pipe 11 may be configured in a bent tubular shape bent in an L shape or the like. The bent tubular injector pipe 11 is opposed to the plurality of filter openings 5w arranged in a row in a posture in which the straight tubular portion on the closed end 11s side is aligned with the arrangement direction of the plurality of filter openings 5w. You may arrange | position in a state. In this case, the total length of the injector pipe 11 is the length of the path in the injector pipe 11 from the open end 11w to the closed end 11s along the axis A.

(L) The form in which the compressed air H is ejected one by one into each of the plurality of injector pipes 11 is the form exemplified in the above embodiment, that is, in the header tank 13 detected by the storage pressure detector 15. When the pressure becomes the target storage pressure, the compressed air interrupting valve 17 is closed and any one of the plurality of diaphragm valves 14 is not opened for a set regeneration time. For example, the storage pressure detector 15 may be omitted, and the control for opening one of the plurality of diaphragm valves 14 during the set regeneration time may be performed one by one at predetermined time intervals. The predetermined time is set to a time required to store at least the compressed air H at the target storage pressure in the header tank 13.

(M) The specific configuration of the communication state switching means is not limited to the diaphragm valve exemplified in the above embodiment, and may be configured by, for example, an electromagnetic valve.

  As described above, it is possible to provide a dust collector that can sufficiently suppress variation in the degree of regeneration of the plurality of cylindrical filters arranged in the direction along the axis of the injector pipe while reducing the price.

DESCRIPTION OF SYMBOLS 1 Case 2 Air supply chamber 3 Exhaust chamber 4 Partition wall 5 Cylindrical filter 5w Filter opening 6 Air compressor (compressed air supply means)
11 Injector pipe 11p Tubular portion 11s Closed end 11w Open end 12 Injection hole 13 Header tank 14 Diaphragm valve (communication state switching means)
18 Annular body A Injector pipe axis F Filter mechanism G Dust-containing air (gas to be filtered)
H Compressed air J Injection mechanism R

Claims (4)

A housing whose interior is partitioned into a supply chamber and an exhaust chamber by a partition wall;
A filter mechanism that is provided on the partition wall and collects dust contained in the gas to be filtered flowing in the housing from the air supply chamber side to the exhaust chamber side;
A jetting mechanism for jetting compressed air discharged from the compressed air supply means in a pulsed manner from the exhaust chamber side to the filter mechanism, and for removing dust collected by the filter mechanism;
The filter mechanism includes a plurality of bottomed cylindrical filters, and the plurality of cylindrical filters are arranged in a row in such a posture that the filter openings at the base ends thereof face the exhaust chamber. In the state, supported by the partition wall,
The injection mechanism is configured to include an injector pipe having a base end opened and a tip closed, and the injector pipe has at least a part in a direction along an axis thereof in the direction in which the plurality of filter openings are arranged. Arranged in the exhaust chamber in a state of facing the plurality of filter openings arranged in a row,
A dust collector in which a plurality of injection holes for injecting the compressed air to the plurality of filter openings are arranged in the injector pipe in a direction along the axis,
The injection mechanism stores the compressed air from the compressed air supply means and is connected in a state where the opening end side of the injector pipe communicates with the inside thereof; the opening end of the injector pipe; and the header tank A communication state switching means that can be switched between a communication state for communicating with the inside and a communication cut-off state that does not allow communication with the inside, and the storage of the header tank by the switching of the communication state switching means to the communication state. Configured to inject compressed air from the open end into the injector pipe,
The inner diameter of the injector pipe is constant,
An annular contraction that provides resistance to the flow of the compressed air from the open end of the injector pipe toward the closed end in at least one portion in the portion between the two injection holes adjacent in the direction along the axis in the injector pipe. A dust collector with a diameter.   The annular diameter-reduced portion is provided at one location in the injector pipe, and the position thereof is between the open end and the closed end in a direction along the axial center from the open end toward the closed end. The dust collector according to claim 1, wherein the dust collector is located between a position separated by a length corresponding to ½ of the total length of the pipe and a position separated by a length corresponding to 3/4 of the total length of the pipe. The injector pipe is composed of two tubular parts separated in a direction along the axial center at an installation location of the annular reduced diameter part,
The annular reduced diameter portion is constituted by a plate-like annular body having an outer diameter larger than an inner diameter of each of the two tubular portions and a smaller inner diameter,
The dust collector according to claim 1 or 2, wherein the annular body is sandwiched between end faces of the two tubular portions.   In the portion between two injection holes adjacent to each other in the direction along the axis in the injector pipe, the annular reduced diameter portion is in the center along the axis or in the direction along the axis rather than in the center. The dust collector according to claim 1, wherein the dust collector is provided at a position on the opening end side.

Images