WO1999030039A1

WO1999030039A1 - Centrifugal pump

Info

Publication number: WO1999030039A1
Application number: PCT/JP1997/004485
Authority: WO
Inventors: Yukimasa Nakatsukasa
Original assignee: Ebara Corporation
Priority date: 1997-12-08
Filing date: 1997-12-08
Publication date: 1999-06-17
Also published as: AU5138398A

Abstract

A centrifugal pump capable of solving various problems which would otherwise have been caused in centrifugal pumps having an impeller rotatably received within a casing formed with a suction port and a discharge port and made of stainless steel. According to the invention, a centrifugal pump comprises a casing (C) formed with a suction port (I) and a discharge port (E) and made of stainless steel and an impeller (1- 1-7) rotatably received within the casing (C), with the pump (P) and drive means (M) arranged vertically. A working fluid is a water mixed with foreign matters (EJ, EJ-1), and a semi-open type impeller and a closed impeller are constructed so that they can be interchanged with each other. If vanes can be interchanged depending upon a kind of foreign matters or a kind of wastes mixed in a water being treated, a demand to use a variety of impellers for the same casing can be met. Further, even when the vanes are interchanged by different ones, a substantial change in an amount of foreign matters passing through the pump does not occur.

Description

Description Centrifugal pump Technical field

The present invention relates to an improvement in a centrifugal pump in which a suction port and a discharge port are formed, and an impeller is rotatably housed inside a casing made of stainless steel. Background art

Such centrifugal pumps are widely used because they can exhibit desired performance and have relatively low manufacturing costs.

However, for example, the pump and the driving means are arranged in the lateral direction, the pump rotation shaft and the output shaft of the driving means are flanged, and the pump rotation shaft is supported by the motor-side bearing and the impeller-side bearing. In the case of a centrifugal pump of the type in which the motor-side bearing and the impeller-side bearing are supported by a bearing housing, the rotary shaft is removed from the pump casing along with the bearing when performing disassembly for maintenance, repair, and other purposes. Was difficult. This required a great deal of labor for disassembly and assembly.

In a pump in which the output shaft of the driving means is inserted into the bore of the connection point provided on the pump rotation shaft, as shown in Fig. 5, two slits are provided at the connection points 10-J. S l and S 2 were formed. However, in such a configuration, if the fastening by the fastening screws bl and b2 is not equal, the same linearity between the motor output shaft and the pump rotation shaft is not maintained, and the rotation transmission system member of the pump is not long. Differential motion and whirling occur, causing interference with the casing, which is inconvenient.

In addition, the centrifugal pump, which has an inner casing for supporting the liner ring provided near the impeller and joins the inner casing to the casing body, securely seals the joint. For this purpose, welding had to be performed over the entire circumference of the inner casing, and the labor required for manufacturing was extremely large.

The pump and the driving means are arranged in the vertical direction, and the rotating shaft is In the pump of the type supported by the lower and lower bearings, the number of parts near the impeller was relatively large, and as a result the number of parts required a lot of labor for assembly, and the strength design was very difficult. .

In addition, bearing housings, motor brackets, motor casings, etc. are used to support members such as bearings, but it is difficult to mount and position these members. In the past, stainless steel submerged filth pumps were conventionally manufactured at low cost, so the casing was automatically determined once the impeller was selected. On the other hand, even with such a stainless steel pump, depending on the type of dirt or foreign matter mixed with the working fluid, the output of the driving means, etc., even if the same casing is used, plural kinds of blades ( Or there is a request to select and use an impeller.

However, in such a conventional pump, whether or not dirt or foreign matter can pass through the pump is determined by the inner diameters of the suction port and the discharge port formed in the pump casing. Could not be used for

In addition to this, in a centrifugal pump in which an inlet and an outlet are formed and an impeller is rotatably housed inside a casing made of stainless steel, the impeller is provided around the rotation axis of the pump in the casing. Dirty or foreign matter is entangled with the spring of the mechanical seal that has been set, causing the motor to lock or preventing the spring from operating, resulting in a situation that impairs the sealing property of the mechanical seal. There was a possibility.

The present invention has been proposed in order to solve the above-mentioned problems of the prior art. An impeller is provided inside a casing formed with a suction port and a discharge port and made of stainless steel. An object of the present invention is to provide a centrifugal pump capable of solving a problem that may occur in a centrifugal pump rotatably housed. Disclosure of the invention

The centrifugal pump according to the present invention is a centrifugal pump in which a suction port and a discharge port are formed and an impeller is rotatably housed inside a casing made of a stainless steel plate, wherein the pump and the driving means are provided. It is arranged in the horizontal direction, the pump rotation axis and the driving means The pump shaft is supported by a motor-side bearing and an impeller-side bearing, and the motor-side bearing and the impeller-side bearing are supported by a bearing housing. The outer flange portion is in contact with the casing and is supported by the ribs. The bearing is characterized in that the inner diameter of the portion of the housing where the impeller-side bearing is supported is smaller than the inner diameter of the opening at the impeller-side end of the flange.

According to the present invention having such a configuration, since the inner diameters of the respective parts are configured to have the above-described relationship, it is possible to separate the flange and draw out the rotating shaft together with the motor-side bearing and the impeller-side bearing. Then, the rotating shaft can be removed together with the bearing from the bearing housing or the pump casing. As a result, maintenance, repair, and other disassembly operations are easier. Also, when assembling, since the rotating shaft may be inserted together with the bearing, the labor of the assembling work is remarkably reduced.

Further, the centrifugal pump of the present invention is a centrifugal pump in which a suction port and a discharge port are formed and an impeller is rotatably housed inside a casing made of a stainless steel plate. The output shaft of the driving means is inserted into a lumen at a connection point provided on the pump rotation shaft, and the output shaft of the driving means is keyed to the lumen. A key groove is formed, and the connection portion includes a slit formed on only one side with respect to a center line thereof, and a cutout provided on a side on which the slit is formed. And fastening means for inserting the notch into the slit to tighten the slit.

According to the present invention having such a configuration, it is very difficult to form two slits at the connection points and equally fasten the fastening means provided at the two places for fastening the slits. In view of the above, since only a single slit was configured to be fastened, the same linearity between the motor output shaft and the pump rotation shaft was maintained, and the interference between the pump rotation transmission system member and the casing. And other inconveniences are prevented.

Further, according to the centrifugal pump of the present invention, in the centrifugal pump in which the suction port and the discharge port are formed and the impeller is rotatably housed inside a casing made of a stainless steel plate, Are arranged in the horizontal direction, near the impeller. And an inner casing for supporting the liner ring provided in the casing. The inner casing is joined to the casing main body, and at a place where the inner casing is joined to the casing main body, A part of the casing protrudes toward the casing body and makes line contact with the inner wall surface of the casing body, and the line contact portion has a continuous closed curve (for example, a circular shape) and is in line contact with the casing body. The inner casing is spot-welded to the inner wall surface of the casing body at a portion closer to the end than the location.

According to the present invention having such a configuration, since the protruding portion of the inner casing is brought into point contact with the inner wall surface of the casing main body (preferably, metal contacts each other), a sufficient seal can be secured. And since sufficient sealing is performed by the said line contact, there is no need to apply a special seal over the entire circumference of the inner casing or to perform continuous welding.

Further, the centrifugal pump of the present invention is a centrifugal pump in which a suction port and a discharge port are formed, and an impeller is rotatably housed inside a casing made of stainless steel, wherein the pump and the driving means are provided. A lower casing is provided between the driving means and the impeller, a rotating shaft is supported by an upper bearing and a lower bearing, and an oil seal is provided below the lower bearing. An oil filling chamber is defined by an oil seal and lower casing, and a strainer, motor casing, and a suction cover are attached to the lower casing.

According to the present invention having such a configuration, the lower casing performs support of the lower bearing, support of the oil seal, definition of the oil filling chamber, installation of the strainer, installation of the motor casing, and installation of the suction cover. It is configured as a member. By configuring the lower casing in this manner, the mounting members such as screws and bolts are concentrated on the lower casing, and the assembling work is facilitated. At the same time, the parts for mounting or disposing the above-mentioned members are only the lower casing and the mounting members (or fastening members) (such as screws and bolts), so the number of parts is dramatically reduced. I do. Furthermore, since the external force or load acting on each member also concentrates on the lower casing, only the strength of the lower casing needs to be considered when designing the strength, and the labor required for the strength design is greatly reduced. Is done.

Here, a bearing cover for supporting an upper bearing is provided above the driving means. Preferably, the bearing cover is made of a material having good workability, heat radiation, and light weight. These are the forces that can dissipate and diffuse the heat inside the motor.

The centrifugal pump according to the present invention is a centrifugal pump in which a suction port and a discharge port are formed and an impeller is rotatably housed inside a casing made of stainless steel plate, wherein the pump and the driving means are provided. The rotating shaft is supported by an upper bearing and a lower bearing, the lower bearing is supported by a bearing housing, and an oil filling chamber is defined by the bearing housing and a motor bracket. And a tightening band for assembling the drive means and its casing by engaging the hook-shaped portion with the lower end of the motor cover. The bearing housing, the motor bracket, the motor casing, the tightening band The lower end of the bracket is fixed at one place by fastening means, and the bearing housing, motor bracket, motor casing The space defined by grayed is fitted is 0-ring, the clamping band under end is welded to the fastening means.

According to the present invention having such a configuration, the zero ring functions as a seal for preventing water from entering from the outside of the pump and a seal for preventing oil in the oil chamber from leaking to the outside, so that the number of parts is reduced. Then, the assembling work becomes easy. Since the bearing housing, motor bracket, motor casing, and tightening band are fixed at one place, the assembly work becomes easy. Furthermore, since the tightening assembly is performed by the tightening band, the speed of the assembling work is improved.

The centrifugal pump according to the present invention is a centrifugal pump in which a suction port and a discharge port are formed and an impeller is rotatably housed inside a casing made of a stainless steel plate, wherein the pump and the driving means are provided. The rotating shaft is supported by an upper bearing and a lower bearing, the lower bearing is supported by a bearing housing, and the bearing housing and the motor bracket define an oil filling chamber. The housing, motor bracket, motor casing, and the lower end of the tightening band are fixed in one place by fastening means, and in the fixed place, the space defined by the bearing housing, motor bracket, and motor casing is zero. The ring is fitted, and the end of the motor casing is narrowed by the lower end of the engagement cap and the motor bracket. The engaging cap is fixed to the motor bracket by fastening means.

Further, the centrifugal pump of the present invention is a centrifugal pump in which a suction port and a discharge port are formed, and an impeller is rotatably housed inside a casing made of a stainless steel plate. The working fluid is water mixed with foreign matter, and the semi-open impeller and the close impeller are configured to be interchangeable.

ADVANTAGE OF THE INVENTION According to this invention, since the blades can be replaced, it is possible to respond to a request to use various impellers for the same casing. Then, a blade having a size and shape corresponding to the type of foreign matter or waste mixed with the working fluid or the output of the driving means can be used.

Here, when using relatively small semi-open impeller blades, such as in the case of a working fluid containing foreign matter that may damage the blades due to collision, the level of the blade tip is closed. Preferably, it is configured to be approximately equal to the level of the car's main plate. With this configuration, the foreign matter can be reliably removed from the casing while preventing the collision of the foreign matter with the blade. At the same time, even if the blades are replaced, it is possible to prevent a large change in the amount of foreign matter passing therethrough.

Further, it is preferable that the respective ends of the casing, the casing of the driving means, and the motor bracket are integrally engaged at one place by the fastening means. With this configuration, assembly becomes very easy, and the labor for assembly is reduced.

Further, an air bleeding mechanism is provided in a region of the casing above the level of the tip of the blade, the air bleeding mechanism comprising: an air bleeding hole drilled at a predetermined position in the casing; It is preferable to have a sewage diffusion prevention cover for preventing sewage from scattering from the water. The air present in such areas is not exhausted by the rotation of the impeller, and if not removed, would have a serious adverse effect on the pumping function. And, since the sewage diffusion prevention cover is provided, sewage can be prevented from being spouted and diffused with the spouting of air.

In addition to the above, the centrifugal pump of the present invention has a suction port and a discharge port, and a rotatable impeller rotatably accommodated inside a casing made of a stainless steel plate. The heart pump is characterized in that a female force seal cover surrounding the female force seal is provided around the female force seal provided around the rotation axis of the pump in the casing. And

By providing this mechanical seal cover, it is possible to prevent dirt or foreign matter from getting entangled in the spring of the mechanical seal, and to prevent failure of the motor lock or the mechanical seal due to a malfunction of the spring.

Alternatively, in a centrifugal pump in which a suction port and a discharge port are formed and an impeller is rotatably housed inside a casing made of stainless steel, a mechanism provided around a rotation axis of the pump in a casing. An inner casing protruding from the casing body toward the impeller is formed so as to surround the two-curl seal, and an air vent hole is formed in the inner casing. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a side sectional view showing a first embodiment of the present invention, FIG. 2 is a side sectional view showing a second embodiment of the present invention, and FIG. 3 is used in the second embodiment. FIG. 4 is a perspective view of the output shaft, FIG. 4 is a cross-sectional view taken along line (4)-(4) in FIG. 3, FIG. 5 is a cross-sectional view of an output shaft used other than in the present invention, and FIG. FIG. 7 is a side sectional view showing a third embodiment of the present invention, FIG. 7 is a partially enlarged view of FIG. 6, FIG. 8 is a side sectional view showing a fourth embodiment of the present invention, and FIG. 10 is a side sectional view showing a pump different from the embodiment of FIG. 9, FIG. 10 is a side sectional view showing a fifth embodiment of the present invention, and FIG. 11 is a part of FIG. FIG. 12 is an enlarged view, FIG. 12 is a side sectional view showing a sixth embodiment of the present invention, FIG. 13 is a partially enlarged view of FIG. 12, and FIG.で A side sectional view showing one mode of the embodiment. FIG. 15 is a side sectional view showing another mode of the seventh embodiment of the present invention, FIG. 16 is a partially enlarged view of FIG. 15, and FIG. FIG. 18 is a side sectional view showing an eighth embodiment, and FIG. 18 is a side sectional view showing a ninth embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 shows a first embodiment of the present invention. In FIG. 1, the whole is denoted by reference numeral P to indicate a centrifugal pump according to the first embodiment, which is configured by rotatably housing an impeller 1 inside a stainless steel casing C. It is driven by a motor indicated by. The rotating shaft 10 of the pump P is connected to the output shaft MO of the motor via the pump-side coupling 12 and the motor-side coupling MF. The rotating shaft 10 is supported by a motor-side bearing 14 and an impeller-side bearing 16 .The motor-side bearing 14 and the impeller-side bearing 16 are connected to a bearing housing 18 (in FIG. Attached to the pump casing C.

Reference numeral 20 denotes a lip of the bearing housing 18 and has a role of supporting a flange that comes into contact with the bearing housing 18 and the casing.

In the bearing housing 18, the inner diameter of the portion where the motor-side bearing 14 is supported is indicated by reference numeral ø1, and the inner diameter of the portion where the impeller-side bearing 16 is supported is indicated by internal diameter ø2. . The inner diameter of the opening at the end of the lip 20 supporting the bearing housing 18 on the side of the impeller 1 is indicated by reference numeral 03.

Here, in the embodiment of FIG. 1, between the inner diameters ø1, Φ2, and Φ3,

0 3〉 0 2〉 0 1

Is established. Therefore, if the coupling 12 is separated and the rotating shaft 10 is pulled out in the direction of the arrow 1 in FIG. 1 together with the motor-side bearing 14 and the impeller-side bearing 16, the bearing can be removed together with the bearing. I can do it. As a result, disassembly work for maintenance, repair, and other tasks becomes easier. At the time of assembling, the rotating shaft 10 (along with the motor-side bearing 14 and the impeller-side bearing 16) may be inserted in the direction opposite to the arrow 1A, so that the assembling work is significantly reduced. is there.

2, 3, and 4 show a second embodiment of the present invention.

In FIG. 2, a rotary shaft 10 of the pump, which is indicated as a whole by reference numeral P, is connected to an output shaft MO of a driving motor, which is indicated by the reference numeral M, through a connection point 10-J. Here, the single unit of the rotary shaft 10 (including the connection point 10-J) of the pump P is shown in Figs.

In FIGS. 3 and 4, the connection point 10 — J of the rotating shaft 10 is a bore 10 — I into which the motor output shaft M 0 (FIG. 2) is to be inserted, and a center line 10 — C Against one side (In Fig. 3, in the center line 10-C, the left side of the center line 10-C), and the notch for tightening the slit 10-S with the fastening screw 24 26 are formed. A keyway 10-K for keying the motor output shaft M0 (FIG. 2) is formed in the bore 10-I of the connection point 10-J.

When connecting the rotating shaft 10 and the motor output shaft M O, the motor output shaft M O is inserted into the inner cavity 10-I and fixed with the key 28. Then, the fastening screws 24 may be tightened.

Here, as shown in Fig. 5, when two slits S1 and S2 are formed at the connection point 10-J, if the fastening by the fastening screws bl and b2 is uneven, However, the same linearity between the motor output shaft MO and the rotary shaft 10 is not maintained, which causes problems such as interference between the rotation transmission system member of the pump P and the casing C. However, it is very difficult to equally fasten the screws b1 and b2 provided at the two locations.

Therefore, in the embodiment of FIG. 2 to FIG. 4, only a single slit 10—S is fastened, so that the interference between the rotation transmission system member of the pump P and the casing C is achieved. It prevents such inconveniences.

6 and 7 show a third embodiment of the present invention.

In FIG. 6, the output shaft of the motor (indicated by the symbol M O in FIGS. 1 and 2) is used as the rotary shaft 10 of the pump, which is entirely represented by the symbol P. In this embodiment, the liner ring 30 provided in the vicinity of the impeller 1 is supported by an inner casing C- 12, and the inner casing C- 12 is a portion indicated by reference numeral (7) in FIG. , Is joined to the casing body C-10.

The location indicated by reference numeral (7) is clearly shown in FIG. Reference numeral 30 in FIG. 7 denotes a portion indicated by reference numeral (7) in FIG. 6, that is, a connection portion between the casing body C-10 and the inner casing C-12.

At the connection point 30, the portion indicated by the reference numeral 30 — T of the inner casing C—12 protrudes toward the casing body C 110, and is linearly connected to the casing body inner wall surface C 110 — 1. The contact 3 4 forms a continuous closed curve (for example, a circumferential shape). In the inner casing C-12, the portion 30-E above the line contact point 34 in FIG. 7 is spot-welded at the point indicated by reference numeral 36, Thus, the inner casing C-12 is fixed to the casing body C-10.

A projecting portion 30-T is formed on the inner casing C-12, and the projecting portion 30-T is in line contact with the casing body C-110 (inner wall surface C-110-I) (reference numeral 34). ), And the metals are brought into contact with each other, so that sufficient sealing can be performed against the action of hydraulic pressure as indicated by the arrow 7L. Then, since sufficient sealing is performed by the line contact (reference numeral 34), it is not necessary to perform welding over the entire circumference of the inner casing C-112.

Then, in order to fix the inner casing C-112 to the casing body C-110, the part 30-E of the inner casing C-112 is changed to the casing body C--10. Point welding (code 36) is sufficient.

In other words, according to this embodiment, there is no need to perform a welding operation or a special sealing method over the entire circumference of the inner casing C-12, so that the manufacturing or processing labor is significantly reduced. is there.

The other parts of the casing are indicated by reference signs CE in FIG.

In addition, the connections shown in FIGS. 6 and 7 are also applicable to the pumps shown in FIGS. 1 and 2, and in order to indicate that, in FIGS. F 6).

FIG. 8 shows a fourth embodiment of the present invention.

In FIG. 8, the pump indicated by the symbol P in its entirety has a suction port I for sucking water through a suction cover (not shown) 491-1a and a discharge port E for discharging water, and is made of stainless steel. Shell casing C made of stainless steel.

This pump P is different from the pumps shown in FIGS. 1, 2 and 6 in that it has a drive mechanism (motor: indicated by symbol M) inside. That is, the rotating shaft 10 of the pump P in FIG. 8 is integrated with the rotor 38, and a stay 39 is provided to face the rotor 38.

A lower casing 40 is provided below the pump P, and the lower casing 40 is shown with hatching in FIG.

In FIG. 8, the rotating shaft 10 is supported by an upper bearing 41 and a lower bearing 42, and oil seals 43, 43 are provided below the lower bearing 42. An oil filling chamber 44 is defined by 43, 43 and the lower casing 40. The oil filling chamber is filled with lubricating oil.

The outer casing C is attached to the lower casing 40 with screws 46, the motor casing 47 is attached with screws 48, and the suction cover 49-a (shown clearly) is attached with screws 49. ) Is attached. In other words, the lower casing 40 supports the lower bearing 42, supports the oil seal 43, defines and installs the oil filling chamber 44, mounts the motor casing 47, installs the suction cover 49, and It is configured as a member for performing the attachment.

By configuring the lower casing 40 in this manner, mounting members such as screws and bolts are concentrated on the lower casing 40, and the assembling work is facilitated. At the same time, the parts for mounting or disposing the above-mentioned members are only the lower casing 40 and the mounting members (such as screws and bolts), so that the number of parts is drastically reduced. Furthermore, since the external force or load acting on each member is also concentrated on the lower casing 40, only the strength of the lower casing 40 needs to be considered when designing the strength, which is spent on the strength design. Labor is greatly reduced.

In this regard, the embodiment of FIG. 8 shows that the lower casing 40 (in the embodiment of FIG. 8) is divided into two members 40-A and 40-B. This is very advantageous as compared with the pump shown by. That is, in FIG. 9, the member 40—A supports the lower bearing 42 and the upper oil seal 43, and the member 40—B is the lower oil seal, the suction cover 49-a, and the poly 51 The oil filling chamber 44A is defined by the members 40-1A and 40-B. Therefore, as compared with FIG. 9, the labor for assembling and designing the strength is increased, and the number of parts is increased.

Further, in the embodiment of FIG. 8, a bearing cover 50 for supporting the upper bearing 41 is fitted to the upper part of the pump P. The bearing cover 50 is made of a material having good workability, heat dissipation and lightness, for example, like aluminum, and not only supports the bearing 41 but also dissipates heat inside the module. Heat dissipation effect

^ '9 O o

FIGS. 10 and 11 show a fifth embodiment of the present invention. The pump indicated by reference numeral P in FIG. 10 as a whole has a drive mechanism (motor: indicated by reference numeral M) therein, similarly to the pump shown in FIG. That is, also in the pump P of FIG. 10, the rotating shaft 10 is integrated with the rotor 38, and a stay 39 is provided to face the rotor 38. Reference numeral 49 indicates casing of the motor M.

The rotating shaft 10 is supported by an upper bearing 41 and a lower bearing 42, and a mechanical seal 52 is provided below the lower bearing 42. The lower bearing 42 is supported by a bearing housing 53. The bearing housing 53, together with the lower bracket 54, defines an oil filling chamber 44 in which lubricating oil is filled.

In FIG. 10, reference numeral 55 denotes a fastening band for assembly. The fastening band 55 has its lower end fixed at the position indicated by the reference numeral (11) in FIG. 10. The hook-shaped portion 55-F at the upper end engages with the lower end of the motor cover 57. The motor M and motor casing 49 are assembled.

The location indicated by reference numeral (11) in Fig. 10 is the location where the bearing housing 53, the motor bracket 54, the motor casing 49, and the tightening band 55 are fixed at the same time. 1 is indicated by 1.

In FIG. 11, bearing housing 53, motor bracket 54, motor casing 49, and tightening band 55 are concentrated at the portion indicated by reference numeral (11) as described above. The 0 ring 56 is fitted in the space (1 1) -S defined by these members.

The 0 ring 56 serves to prevent water outside the pump from entering the motor M (FIG. 10) or the oil filling chamber 44 (FIG. 10), It has the effect of preventing the lubricating oil in the chamber 44 from entering the motor M.

In other words, the 0 ring 56 functions as a water seal and an oil seal. In this way, by giving the 0-ring 56 a function as two types of sealing materials, the number of parts is reduced and the assembling work is facilitated.

Again at the point (11) in Fig. 11, the mobile bracket 54 and the motor casing The fastening band 55 is pressed and fixed to the nut 59 screwed to the bolt 58. At the same time, a fastening band 55 is welded to the nut 59 (reference numeral 60 in FIG. 11). Therefore, when assembling the pump, the tip 55-F of the tightening band 55 is engaged with the lower end of the motor cover 57, and the nut 59 is lowered by rotating the bolt 58 so that the band 59 is lowered. 5 The tightening assembly according to 5 is performed.

FIGS. 12 and 13 show a sixth embodiment of the present invention.

The pump denoted by reference numeral P in FIG. 12 also has a drive mechanism (motor: denoted by reference character M) inside thereof, similarly to the pump shown in FIG. A stator 39 is provided integrally with the evening 38 and opposed to the rotor 38. Reference numeral 49 indicates the case of the mobile phone.

The rotating shaft 10 is supported by an upper bearing 4 1 and a lower bearing 4 2 .A mechanical force seal 5 2 is provided below the lower bearing 4 2, and the upper bearing 4 2 is supported by a bearing housing 5 3. ing. The bearing housing 53 and the motor bracket 54 define an oil filling chamber 44 filled with lubricating oil, and the oil filling chamber 44 is provided with a baffle plate 61. The baffle plate 61 is for preventing the lubricating oil in the oil filling chamber 44 from rotating.

In this embodiment, the bearing housing 53, the motor bracket 54, and the motor casing 49 are simultaneously fixed at the position indicated by the reference numeral (13). Details of this part (13) are shown in Fig.13.

In FIG. 13, the space indicated by the reference numeral (13) is a space defined by the bearing housing 53, the motor bracket 54, and the motor casing 49. Are fitted.

The O-ring 62 functions to prevent water outside the pump from entering the inside of the motor M (FIG. 12) or the filling chamber 44 (FIG. 12). This has the effect of preventing the lubricating oil in the oil filling chamber 44 from entering the motor M. Therefore, the O-ring 62 also functions as a water seal and a wheel seal. And, since the 0-ring 62 functions as two types of sealing materials, the number of parts is reduced, and the assembling work is facilitated.

The end of the motor casing 4 9 4 9 — E is the lower end of the engagement cap 6 3 6 3 — E and the motor bracket 54 pinch and fix it. The cap 63 is fixed by screwing the bolt 64 and the nut 65 together.

That is, in the embodiment shown in FIGS. 12 and 13, the end 49 -E of the motor casing 49 is held by the lower end 63 -E of the engagement cap 63 and the motor bracket 54. The bolt (64) and the nut (65) are screwed together to fix the cap (63) to the motor bracket (54), thereby completing the fixing of the portion (13).

Reference numeral 66 in FIG. 13 denotes a sleeve that functions as a stopper for preventing deformation of the cap 63.

FIG. 14, FIG. 15, and FIG. 16 show a seventh embodiment of the present invention.

The pump indicated by the reference symbol P in FIG. 14 is a so-called “submerged waste pump”, for example, a pump having a casing C formed by pressing stainless steel. Then, from the suction port indicated by the symbol I, water mixed with dirt or foreign matter EJ indicated by a dotted line in FIG. 14 (FIG. 15) is sucked, and the impeller 1-7 having the impeller 70 (closed impeller main plate) is drawn. (Closed impeller) gives heads and discharges from outlet E.

Here, the blade indicated by reference numeral 70 (the main plate of the closed impeller) has a very large area, as is clear from FIG. 14, and is set to a size large enough to push out and discharge foreign matter EJ. . Such a blade 70 is very useful for removing foreign substances that cannot be discharged from the casing C by simply adding head to water.

On the other hand, the pump shown in FIG. 15 also relates to the same embodiment as the pump P shown in FIG. 14, and the pump in FIG. 15 also has an impeller (semi-open type impeller). However, the blades 74 (semi-open impeller blades) used in the pump shown in FIG. 15 are much smaller than the blades 70 (closed impeller main plate) in FIG. Are also provided. The level of the tip of the impeller 74 (the lower end in Fig. 15) 74-E (indicated by the two-dot chain line in Fig. 15) LP is almost equal to the level of the main plate of the closed impeller. It is designed so that foreign matter EJ-1 of diameter D—EJ does not interfere with the blade 74.

Such a blade 74 is suitable for, for example, discharging foreign matter from the pump casing such that the blade itself is damaged when it comes into contact with the blade. Here, the level LP at the tip of the impeller 74 is almost equal to the level at the tip of the impeller 1-7. Therefore, also in FIG. 15, the cross-sectional area of the portion through which the foreign matter EJ-1 passes in the casing C is equal to the cross-sectional area of the portion through which the foreign matter EJ passes in FIG. In other words, the pump of FIG. 14 and the pump of FIG. 15 having different blade shapes and sizes have the same amount of foreign matter passing therethrough.

As described above, the embodiments shown in FIGS. 14 and 15 are characterized in that the blades can be replaced depending on the type of foreign matter or waste mixed in the water to be treated. Moreover, even if the blades are replaced, the amount of foreign matter passing through does not change significantly. At this time, when replacing the blades, the blade mounting bolts 7 2 (FIG. 14) of the impellers 1 to 7 may be removed.

Further, according to the embodiments shown in FIGS. 14 and 15, blades having dimensions and shapes corresponding to the pump output can be used. That is, if the horsepower of the motor M is large, a large blade can be used, and if the horsepower is small, a small blade may be used.

Conventionally, with a stainless steel submersible filth pump as shown in Figs. 14 and 15, the casing was automatically determined when the impeller was selected because of its low cost. In such a conventional pump, whether or not dirt or foreign matter can pass through the pump is determined by the inner diameters of a suction port and a discharge port formed in the pump casing. Could not be used for the same casing.

However, according to the embodiments shown in FIGS. 14 and 15, since the blades can be replaced, it is possible to respond to a request to use various impellers for the same casing.

When assembling the embodiment shown in FIGS. 14 and 15, the ends of the casing, the motor casing 49 and the motor bracket 54 are assembled and integrated by the assembly bolts 76. I have. With this configuration, the labor required for assembly is greatly reduced.

When the blade 74 shown in FIG. 15 is used, air or bubbles existing above the level LP cannot be removed. Therefore, in FIG. 15, the portion indicated by reference numeral (16) is used to remove air or bubbles existing above the level LP. Is configured. The configuration of the area indicated by the reference numeral (16) is shown in FIG.

In FIG. 16, air or air bubbles BC are retained in a region above the level LP in the space inside the casing C. It is difficult for the blade 74 shown in FIG. 15 to add a head to the area above the level LP, and the blade 74 discharges air or air bubbles BC from the discharge port E (FIG. 15). I can't do that.

Therefore, as shown in FIG. 17, an air vent hole 78 is formed in the portion (16) of the casing C. At the same time, a cover 79 surrounding the air vent hole 78 is formed in order to prevent the sewage from being scattered by the ejection.

FIG. 17 shows an eighth embodiment of the present invention.

In FIG. 17, the pump denoted by reference numeral P as a whole has a rotation axis 10 as an output shaft of a motor M as driving means. In the casing C, the impeller 1 is rotatably housed. Then, water is sucked in from the suction port I (arrows A-I), the head is added by the impeller 1, and then water is discharged from the discharge port E (arrows A-E). A mechanical seal 82 is provided around the rotation axis 10 in the casing C. Further, a mechanical seal cover 84 is provided so as to surround the mechanical seal 82.

By providing the mechanical seal cover 84, it is possible to prevent dirt or foreign matter from entangled in the spring (not clearly shown in FIG. 17) of the mechanical seal 82. Therefore, it is possible to prevent the motor port ゃ, which may be generated when dirt or foreign matter is entangled with the spring of the mechanical seal 82, and also prevent the seal from being damaged.

FIG. 18 shows a ninth embodiment of the present invention. This embodiment is substantially the same as the embodiment of FIG. 17, except that the casing C-8 is formed so as to surround the female seal 82 instead of the mechanical seal cover 84 of FIG. 6 is extended.

The operation and effect of the embodiment of FIG. 18 are substantially the same as those of the embodiment of FIG. However, in the case of casing C186 of the embodiment of FIG. 18, it is necessary to form an air vent hole. The invention's effect

The functions and effects of the present invention are listed below.

(1) Inner diameter ø1 of the bearing housing where the motor-side bearing is supported, ø2 of the area where the impeller-side bearing is supported, and the end of the lip supporting the bearing housing on the impeller side By setting the inner diameter of the opening of the part to 0 3> 0 2> 0 1, it becomes easy to remove the output shaft from the pump casing together with the bearing. As a result, the disassembling operation and the assembling operation become extremely easy.

(2) Since only a single slit is formed at the connection point where the pump output shaft is connected to the motor output shaft, linearity between the pump output shaft and the motor output shaft is ensured, and the pump rotation transmission system Problems such as interference between the member and the casing are prevented.

(3) At the joint between the inner casing and the casing body, a part of the inner casing is projected toward the casing body side, and is brought into line contact with the inner wall surface of the casing body to make sufficient metal contact. Ensuring sealing performance. At the same time, it became unnecessary to perform welding all around the inner casing.

(4) Assemble the lower casing as a member that supports the lower bearing, supports the oil seal, defines the oil filling chamber, attaches the strainer, attaches the motor casing, and attaches the suction cover. Work has been simplified, the number of parts has been dramatically reduced, and only the strength of the lower casing has to be considered when designing the strength.

(5) If the bearing cover for supporting the upper bearing is made of a material with good workability, heat dissipation and light weight, the heat of the motor can be dissipated.

(6) If the ring is configured to function as a water seal and an oil seal, the number of parts is reduced and the assembling work is facilitated.

(7) If it is configured to be assembled using a tightening band, assembly will be easy.o

(8) If it is configured so that the blades can be replaced depending on the type of foreign matter or waste mixed in the water to be treated, it is possible to meet the demand for using various impellers for the same casing. . Moreover, even if the blades are replaced, the amount of foreign matter passing through does not change significantly. (9) When the blades are replaceable, if the respective ends of the casing, motor casing, and motor bracket are assembled and integrated with the assembly bolts, The labor involved is greatly reduced.

(10) When the blades are configured to be replaceable, air or bubbles existing above the level of the tip of the small blade can be removed by providing an air venting mechanism.

(1 1) By having a structure surrounding the mechanical seal, it is possible to prevent dirt or foreign matter from getting entangled in the spring of the mechanical seal, and also to prevent the motor lock or the seal from being damaged.

Claims

The scope of the claims

1. In a centrifugal pump in which an inlet and an outlet are formed and an impeller is rotatably housed inside a casing made of stainless steel plate, the pump and the driving means are arranged in a horizontal direction. The pump rotating shaft and the output shaft of the driving means are flanged, the pump rotating shaft is supported by a motor-side bearing and an impeller-side bearing, and the motor-side bearing and the impeller-side bearing are a bearing housing. It is supported, and the flange outside the bearing housing is in contact with the casing and is supported by the rib.The inner diameter of the bearing housing where the motor-side bearing is supported is the impeller-side bearing Is smaller than the inside diameter of the place where the bearing is supported, and the inside diameter of the place where the impeller side bearing of the bearing housing is supported is smaller than the inside diameter of the opening at the impeller end of the flange. Centrifugal pump, characterized in that.

2. In a centrifugal pump in which a suction port and a discharge port are formed and an impeller is rotatably housed inside a casing made of a stainless steel plate, the pump and the driving means are arranged in a horizontal direction. An output shaft of the driving means is inserted into a lumen at a connection point provided on the pump rotating shaft, and a key groove for keying the output shaft of the driving means is formed in the lumen. The connection portion includes a slit formed on only one side with respect to the center line, a notch provided on the side where the slit is formed, and a notch inserted into the notch. A centrifugal pump having a fastening means for tightening a slit.

3. In a centrifugal pump having a suction port and a discharge port formed therein and an impeller rotatably housed inside a casing made of a stainless steel plate, the pump and the driving means are arranged in the horizontal direction. An inner casing provided near the impeller for supporting a liner ring, the inner casing is joined to the casing body, and the inner casing is joined to the casing body. At the point where the inner casing protrudes toward the casing body side and makes line contact with the inner wall surface of the casing body, and the line contact point has a continuous closed curve. From the point of contact A centrifugal pump characterized in that the inner casing is spot-welded to the inner wall surface of the casing body at the end portion.

4. In a centrifugal pump having a suction port and a discharge port formed therein and an impeller rotatably housed inside a casing made of stainless steel plate, the pump and the driving means are arranged vertically. A lower casing is provided between the driving means and the impeller, a rotating shaft is supported by an upper bearing and a lower bearing, and an oil seal is provided below the lower bearing. A centrifugal pump wherein an oil filling chamber is defined by a lower casing, and a strainer, a motor casing, and a suction cover are attached to a lower casing.

5. A bearing cover for supporting an upper bearing is fitted above the driving means, and the bearing cover is made of a material having good workability, heat radiation, and light weight. Range 4 centrifugal pump.

6. In a centrifugal pump having a suction port and a discharge port formed therein and an impeller rotatably housed inside a casing made of a stainless steel plate, the pump and the driving means are vertically arranged. The rotating shaft is supported by an upper bearing and a lower bearing, and the lower bearing is supported by a bearing housing. An oil filling chamber is defined by the bearing housing and a motor bracket. It has a fastening band which engages with the lower end to assemble the driving means and its casing, and the bearing housing, the motor bracket, the motor casing, and the lower end of the fastening band are connected at one place by the fastening means. At the fixed location, the bearing housing, the motor bracket, and the space defined by the motor casing A centrifugal pump wherein an O-ring is fitted, and a lower end of the tightening band is welded to the fastening means.

7. In a centrifugal pump having a suction port and a discharge port formed therein and an impeller rotatably housed inside a casing made of a stainless steel plate, the pump and the driving means are arranged vertically. The rotating shaft is supported by an upper bearing and a lower bearing, the lower bearing is supported by a bearing housing, and an oil filling chamber is defined by the bearing housing and the motor bracket. The bearing housing, the motor bracket, and the motor casing , The lower end of the tightening band is fixed at one place by fastening means, At the fixing point, a ring is fitted in the space defined by the bearing housing, the motor bracket, and the motor casing. A centrifugal pump characterized in that the engagement cap is fixed to the motor bracket by fastening means.

8. In a centrifugal pump in which a suction port and a discharge port are formed and an impeller is rotatably housed inside a casing made of stainless steel, the pump and the driving means are vertically arranged, The centrifugal pump is characterized in that the working fluid is water mixed with foreign matter, and the semi-open impeller and the closed impeller are configured to be interchangeable.

9. The centrifugal pump according to claim 8, wherein the semi-open type impeller is configured so that the level at the blade tip is substantially equal to the level of the main plate of the closed impeller.

10. The casing according to claim 8 or claim 9, wherein each end of the casing, the casing of the driving means, and the motor bracket is integrally engaged at one place by the fastening means. Any centrifugal pump.

11. An air venting mechanism is provided in a region of the casing above the level of the tip of the blade, the air venting mechanism includes an air vent hole drilled at a predetermined position of the casing, and an air vent mechanism. 10. The pump according to claim 8, further comprising a sewage diffusion prevention cover for preventing sewage from scattering from the holes.

12. A centrifugal pump in which an inlet and an outlet are formed and an impeller is rotatably housed inside a casing made of stainless steel plate, provided around the pump rotation shaft in a casing. A remote pump, wherein a mechanical seal cover surrounding the mechanical seal is provided around the provided mechanical seal.

13. A centrifugal pump in which an intake port and a discharge port are formed and an impeller is rotatably housed inside a casing made of stainless steel plate, and around a pump rotation shaft in the casing. Forming an inner casing projecting from the casing body toward the impeller so as to surround the mechanical seal provided on the inner casing; A centrifugal pump characterized in that an air vent hole is formed in the ring.