WO2004060566A1 - Centrifugal separator - Google Patents

Abstract

A screen-bowl type centrifugal separator capable of eliminating productivity lowering caused by clogging by a material to be processed such as crystals in a screen portion as an essential portion of the separator as well as reducing the leak of the material to be processed in the screen portion. Inside a hub (41) of a screw conveyer (40), a cleaning liquid receiver (43) is provided for receiving the cleaning liquid for a cleaning nozzle (45). Furthermore, inside the cleaning liquid receiver (43), there is provided a remaining layer cleaning liquid receiver (46) separately from the cleaning liquid receiver (43), for receiving a cleaning liquid for cleaning the remaining layered material to be processed in the screen portion (30). The cleaning liquid supplied to the remaining layer cleaning liquid receiver (46) is injected by a remaining layer cleaning path provided along a helical direction of a flight (42), while being separated from the cleaning liquid receiver (43), directly toward the remaining layered material to be processed from the outer periphery of the flight (42).

Description

 Description Centrifuge Technical field

 According to the present invention, a screw conveyor is provided in a bowl, and these are relatively rotatably supported to separate a processed material from a stock solution supplied into the bowl, and an inner peripheral surface on one end side of the bowl. A centrifugal separator for washing and dewatering the processing object by means of a screen provided along with a cleaning liquid receiver for receiving the cleaning liquid supplied to the hub of the screw conveyer; The present invention relates to a centrifugal separator having a washing nozzle for ejecting a washing liquid in the section toward the screen section. Such a centrifuge is used for purifying various crystals in the fields of the chemical industry and the food industry. Background art

Conventionally, in a screen bowl type centrifuge, when an undiluted solution consisting of a crystalline solid and a solvent is supplied into the bowl, the undiluted solution is separated into crystals and a solvent in the bowl by centrifugal force. The crystals settle on the inner peripheral surface of the bowl, and are conveyed by a screw con- verter provided with a slight rotation difference from the bowl, and are subjected to a liquid removing action at a tapered portion on one end side of the powl. In general, the dehydrated crystals adhere to the crystal surface impurities and solvents generated during the manufacturing process.In order to clean these extra deposits, the crystals are placed on the inner peripheral side of the bowl following the taper. In addition to providing a screen part, a cleaning nozzle that jets the cleaning liquid toward the relevant part is provided on the hub of the screw conveyor, and the cleaning part sprays the cleaning liquid all over the crystal being transported. Cleaning was done by doing. For example, see Patent Literature 1 (Japanese Patent Application Laid-Open No. 2000-3202583). '

 However, in the screen bowl type centrifuge as described above. In the radial gap formed between the outer peripheral edge of the screw conveyor and the inner peripheral surface of the screen, crystals are not transported by the conveyor. After a long operation, the residual layer of the crystal does not move, and is pressed against the outer periphery of the flight.

 Thus, there is a problem that the crystals forming the remaining layer not only impair the permeability of the cleaning solution, but also impair the mobility for replacement with the new remaining layer crystal. Such a condition is generally called screen clogging. In order to eliminate the clogging of the screen, it is necessary to suspend the supply of the stock solution and to supply the cleaning solution for a certain period of time instead. For this reason, the suspension time of the supply of undiluted solution could not contribute to production, which was a factor that reduced productivity.

 Furthermore, regarding the leakage at the screen part, when the cleaning liquid is jetted all over the crystal transported by the fly, the amount of the crystal is proportional to the amount of the liquid passing through the crystal layer. However, there has been a problem that crystals in an amount proportional to the screen opening cause leakage.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. In a screen bowl type centrifugal separator, a processed material such as a crystal in a main part of a screen part is provided. It is an object of the present invention to provide a centrifugal separator that can not only reduce the decrease in productivity due to the occurrence of clogging due to clogging, but also reduce the amount of clogging of the processed material in the screen part. '' Disclosure of the Invention The gist of the present invention to achieve the above-mentioned object lies in the following inventions.

 [1] A screw conveyer is provided in a bowl, and these are relatively rotatably supported to separate a processed material from a stock solution supplied into the bowl, and an inner peripheral surface on one end side of the bowl. A centrifugal separator for washing and dewatering the above-mentioned processed material at a screen portion provided along with a cleaning liquid receiving portion for receiving the cleaning liquid supplied to the hub of the screw conveyor; A centrifugal separator having a cleaning nozzle for ejecting a cleaning liquid in a receiving portion toward the screen portion,

 In the cleaning liquid receiving portion, a residual layer cleaning liquid receiving portion for receiving a cleaning liquid for cleaning a residual layer processed product generated in a gap between an outer peripheral edge of the screw conveyor and an inner peripheral surface of the screen portion is provided with the cleaning liquid. It is provided separately from the receiving part,

 Along the spiral direction of the flight, the cleaning liquid in the cleaning liquid receiving portion for the residual layer is directly separated from the cleaning liquid receiving portion toward the residual layer processed material from the outer peripheral edge of the flight. A centrifugal separator characterized by forming a washing path for the remaining layer to be ejected.

 [2] A screw conveyer is provided in the powl, and these are relatively rotatably supported to separate the processed material from the undiluted solution supplied into the bowl and to the inner peripheral surface on one end side of the bowl. A centrifugal separator for cleaning and dewatering the above-mentioned processed material at a screen portion provided along the cleaning portion; a cleaning liquid receiving portion for receiving the cleaning liquid supplied to the hub of the screw conveyor; A washing nozzle for ejecting a washing liquid in the section toward the screen section,

In the cleaning liquid receiving portion, a cleaning process is performed for cleaning a residual layer processed product generated in a gap between the outer peripheral edge of the screw of the screw conveyor and the inner peripheral surface of the screen portion. A cleaning liquid receiving section for the remaining layer that receives the cleaning liquid is provided separately from the inside of the cleaning liquid receiving section,

 A connecting pipe is provided at a position where the inner peripheral edge of the fly is continuous at predetermined intervals along a spiral direction of the fly, at a bottom side of the residual layer cleaning liquid receiving portion, and a hub or fly of the screw conveyor is provided. A cleaning liquid discharge hole extending radially from the inner peripheral side of the hub to the outer peripheral edge of the fly and communicating with the connection pipe,

 A centrifugal separator characterized in that the cleaning liquid in the cleaning liquid receiving portion for the residual layer is jetted directly from the front end of each of the cleaning liquid discharge holes opened in the outer peripheral edge of the cleaning liquid toward the residual layer processing object.

 [3] A screw conveyor is provided in the bowl, and these are relatively rotatably supported. The processed material is separated from the stock solution supplied into the bowl, and the inner peripheral surface at one end of the powl is provided. A centrifugal separator for washing and dewatering the processed material in a screen section provided along the line, wherein a cleaning liquid receiving section for receiving the cleaning liquid supplied into the hap of the screw conveyer; A centrifugal separator having a cleaning nozzle for ejecting a cleaning liquid in a receiving portion toward the screen portion,

 In the cleaning liquid receiving portion, a residual layer cleaning liquid receiving portion for receiving a cleaning liquid for cleaning a residual layer processed product generated in a gap between an outer peripheral edge of the screw conveyor and an inner peripheral surface of the screen portion is provided. It is provided separately from the inside of the washing liquid receiving section,

 A connection pipe is provided at a position adjacent to a surface of the fly opposite to the processed material transfer surface, at predetermined intervals along a spiral direction of the fly, at a bottom side of the residual layer cleaning liquid receiver, and Providing a washing liquid communication hole through which the connection pipe communicates with the haptic of the screw conveyor;

A predetermined distance along the spiral direction of the flight At intervals, a cleaning liquid discharge pipe extending radially from the inner peripheral edge to the outer peripheral edge of the flight and communicating with the cleaning liquid communication hole is attached,

 A centrifugal separator, wherein the cleaning liquid in the cleaning liquid receiving portion for the residual layer is directly discharged from the distal end of the cleaning liquid discharge pipe toward the residual layer processed material. -

[4] The method according to [2], wherein a groove extending continuously in a spiral direction of the fly and formed in a distal end surface of the outer peripheral edge of the fly and communicating with a distal end of each of the cleaning liquid discharge holes is formed. Centrifuge.

 [5] A feed tube for supplying a stock solution extending in the axial direction is inserted into the inside of the hub of the screw conveyor.

 A cleaning liquid supply path for supplying a cleaning liquid to the cleaning liquid receiving section is formed in the feed tube, and an opening for the cleaning liquid supply path is provided in the middle of the feed tube overlapping the cleaning liquid receiving section in the radial direction. In the feed tube, a residual layer cleaning liquid supply path for supplying the residual layer cleaning liquid to the residual layer cleaning liquid receiving part is formed, and in the middle of a feed tube radially overlapping the residual layer cleaning liquid receiving part. The centrifuge according to [1], [2], [3], or [4], wherein an opening for the supply path of the residual layer cleaning liquid is provided.

 Next, the operation of the present invention will be described.

According to the centrifuge described in the above [1], when the stock solution is supplied into the powl, the stock solution is separated into a processed product and a mother liquor in the bowl by centrifugal force, and the processed product is formed on the inner peripheral surface of the bowl. The settled material is conveyed by a screw conveyor provided with a rotation difference from the bowl. However, in the radial gap formed between the outer peripheral edge of the screw of the screw conveyor and the inner peripheral surface of the screen part, the processed material is not sufficiently transported by the conveyor, and is _c transported as the remaining layer. Processed material that has been drained on the way is generally free from impurities generated during the manufacturing process. And the mother liquor itself are adhered to the surface, and in order to wash out these extraneous substances, a screen provided along the inner peripheral surface at one end of the bowl is used to clean the screen at the hub of the screw conveyor. Cleaning is performed by spraying the cleaning liquid from the nozzle toward the processing object. The cleaning liquid here is supplied to the cleaning liquid receiving section in the haptic via a cleaning liquid supply path separately provided in a feed tube for supplying the undiluted liquid into the bowl.

 In the cleaning liquid receiving portion, a remaining layer cleaning liquid receiving portion for receiving a cleaning liquid for cleaning the remaining layer of the processed material is provided separately from the cleaning liquid receiving portion, and the remaining layer cleaning liquid receiving portion is provided. The cleaning liquid supplied to the filter is separated from the cleaning liquid receiving portion by the residual layer cleaning path provided along the spiral direction of the fly, and directly from the outer peripheral edge of the fly toward the residual layer processing object. It is gushing. As a result, it is possible to separately perform the cleaning of the processed material by the cleaning nozzle and the cleaning of the residual layer processed material by the cleaning path for the residual layer, so that the type and amount of the cleaning liquid can be different from each other. .

 As described above, separately from the entire processed material, the residual layer processed material generated in the gap between the outer peripheral edge of the screw conveyor and the inner peripheral surface of the screen portion can be particularly directly cleaned, so that the residual layer can be cleaned. This eliminates sticking of the layer processing material, improves mobility, and improves the permeability of the cleaning liquid to the entire processing material being transported. Therefore, clogging of the processed material in the screen portion can be prevented beforehand, and the amount of the cleaning liquid for replacing impurities in the original processed material can be suppressed. The amount of eye leakage can be reduced.

Further, according to the centrifuge described in the above [2], the cleaning liquid in the residual layer cleaning liquid receiving portion is provided at a predetermined interval along a spiral direction of the fly at a position where the inner peripheral edge of the fly is continuous. Washing provided inside the hub or flight of the screw conveyor through the connection pipes provided every other Jump out into the bowl from the liquid discharge hole. The cleaning liquid discharge holes radially extend from the inner peripheral side of the hub to the outer peripheral edge of the fly, and are directed toward the residual layer processing object from the front end openings of the respective cleaning liquid discharge holes that open to the outer peripheral edges of the fly. The cleaning liquid can be ejected directly.

 Here, as in the centrifugal separator according to the above [4], a groove extending continuously in the spiral direction of the fly and communicating with the distal end port of each of the washing liquid discharge holes is formed on the distal end surface of the outer peripheral edge of the fly. If formed, the cleaning liquid discharged from the tip end of each cleaning liquid discharge hole spreads over the entire outer peripheral edge of the fly along the groove, and is directly jetted toward the remaining layer processing material so as to spread over the entire circumference in the radial direction. That's a thing.

 Further, according to the centrifuge described in the above [3], the cleaning liquid in the residual layer cleaning liquid receiving portion is subjected to a frying operation at a position adjacent to a surface of the freight opposite to a processing object transport surface. Through the connecting pipes provided at predetermined intervals along the spiral direction of the nozzle and the cleaning liquid communication holes provided in the hub of the screw conveyor, and to the face on the opposite side of the flight, The cleaning liquid discharge pipes that are introduced into the cleaning liquid discharge pipes provided at predetermined intervals along the spiral direction extend radially from the inner peripheral edge to the outer peripheral edge of the fly, and extend along the outer peripheral edge of the fly. The cleaning liquid can be jetted directly from the tip end of each of the cleaning liquid discharge pipes toward the residual layer processed material. According to such a configuration, it is not necessary to provide a hole in the fly itself, and the cleaning liquid discharge pipe can be retrofitted to the fly, so that the manufacture can be performed relatively easily. .

Furthermore, in order to supply the cleaning liquid to the cleaning liquid receiving portion and the residual layer cleaning liquid receiving portion in the haptic of the squirrel conveyor, as described in the above [5], the cleaning liquid is similarly introduced into the hub. A part of the feed tube for supplying the undiluted solution can be effectively used. In other words, a cleaning liquid supply path for supplying the cleaning liquid to the cleaning liquid receiving section is formed in the feed tube, and an opening for the cleaning liquid supply path is provided in the middle of the feed tube overlapping the cleaning liquid receiving section in the radial direction.

 Similarly, a residual layer cleaning liquid supply path for supplying the residual layer cleaning liquid to the residual layer cleaning liquid receiving section is formed in the feed tube, and in the middle of a feed tube radially overlapping the residual layer cleaning liquid receiving section. By providing an opening for the residual layer cleaning liquid supply path, it is possible to efficiently supply the cleaning liquid separately to the cleaning liquid receiving section and the residual layer cleaning liquid receiving section. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a longitudinal sectional view showing a main part of a centrifuge according to a first embodiment of the present invention.

 FIG. 2 is a longitudinal sectional view showing the whole of the centrifuge according to the first embodiment of the present invention.

 FIG. 3 is a sectional view taken along line III-III in FIG.

 FIG. 4 is a longitudinal sectional view showing a main part of a centrifuge according to a second embodiment of the present invention.

 FIG. 5 is an enlarged longitudinal sectional view showing a main part of a centrifuge according to a second embodiment of the present invention.

 FIG. 6 is a sectional view taken along line VI-VI of FIG.

 FIG. 7 is a longitudinal sectional view showing a main part of a centrifuge according to a third embodiment of the present invention.

 FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, various embodiments representing the present invention will be described with reference to the drawings. 1 to 3 show a first embodiment of the present invention.

 The centrifugal separator 10 according to the present embodiment is called a screen bowl type centrifugal separator, and is provided with a screw conveyor 40 in a substantially cylindrical bowl 20. It is supported so as to be relatively rotatable, and is configured such that a processed material to be processed and a mother liquor can be separately separated from a stock solution supplied into the bowl 20.

 Here, the processed material corresponds to various crystals in the fields of the chemical industry and the food industry, and specifically, for example, terephthalic acid as a raw material for pet bottles and polyester fibers, paraxylene as a raw material for terephthalic acid, and CD. — Bisphenol, which is a raw material for ROM, and glutamine soda, which is a raw material for chemical seasonings and ingredients. Various solvents correspond to the mother liquor. Each seed crystal has a solvent constituting an unpolymerized substance slurry adhered to the crystal surface during the manufacturing process, and these adhered substances can be washed and replaced with a washing liquid (a specific other solvent or the like). Hereinafter, an example in which the present invention is applied to a crystal as a processed material will be described.

As shown in FIG. 2, the bowl 20 and the screw conveyor 40 therein are rotatably supported inside the casing 11 via shafts 12a and 12b. The powl 20 and the screw conveyor 40 are rotationally driven at a slight differential speed by a differential device 14 connected to a bearing 13 on one side. Such a differential device 14 itself is publicly known, and a detailed description thereof will be omitted. The interior of the casing 11 is partitioned so as to correspond to a discharge port 24, a screen portion 30, a dam portion 26, and the like provided in a bowl 20 described below. A crystal discharge port 15 communicating with the discharge port 24, a cleaning liquid discharge port 16 communicating with the screen section 30, and a mother liquid discharge port 1 communicating with the dam section 26 are provided at a lower portion of the casing 11. 7 are provided respectively. One end side of the bowl 20 (right side in Fig. 2) is the direction of crystal discharge, and from the other end side of the pole 20 (left side in Fig. 2), in order from the large-diameter parallel 'cylindrical part 21 and one end. It is divided into a tapered portion 22 whose inner diameter gradually decreases toward the side, and a small-diameter parallel tube portion 23. At the distal end of the small-diameter parallel cylindrical portion 23, a crystal discharge port 24 is opened, and near the distal end of the large-diameter parallel cylindrical portion 21, the liquid depth in the radial direction of the bowl 20 is regulated. A dam 26 is provided which can discharge the mother liquor from which the crystals have been separated out of the bowl 20.

 As shown in Fig. 1, the small-diameter parallel cylindrical portion 23 has a large number of filtrate discharge holes 25 formed on the wall surface, and the inner peripheral side is covered with a cylindrical filter medium 31 in the entire circumferential direction, and the screen is screened. Part 30. The size of the filtrate discharge hole 25 does not need to be considered so much in terms of the crystal particle diameter.However, the filter medium 31 is made of a material having a large number of micropores or slits whose diameter is smaller than the crystal particle diameter. Become. Specifically, for example, edge wire screens, porous ceramic moldings, and the like may be used. The inner peripheral surface of the parallel cylindrical portion 23 is shaved by the thickness of the filter medium 31.

 The screw conveyor 40 includes a hub 41 serving as a rotating shaft thereof, and a fly 42 provided in a screw-shape on the outer periphery of the hub 41. The fly 42 holds crystals in a bowl 20. It is formed so as to be conveyed to one end (right side in Fig. 2). The screw conveyor 40 and the bowl 20 are different between the outer peripheral edge of the fly 42 and the inner peripheral surface of the parallel tubular portion 23 (the surface of the filter medium 31 of the screen portion 30). Due to the structure that rotates at the speed, it is set so that there is a gap in the radial direction.

The hub 41 has a cleaning liquid receiving portion 43 for receiving the cleaning liquid supplied therein, and a cleaning nozzle 4 for jetting the cleaning liquid in the cleaning liquid receiving portion 43 toward the screen portion 30 of the bowl 20. 5 is provided. The cleaning liquid receiving section 43 is located in the entire circumferential direction of the inner peripheral surface of the hub 41! : Specified width in the direction of the beam axis It consists of a part surrounded by a partition that extends to

 A cleaning liquid communication hole 44 is provided at predetermined intervals on a peripheral wall of the hap 41, which is a bottom side of the cleaning liquid receiving portion 43, and a cleaning communicating with the cleaning liquid communication hole 44 is provided on an outer peripheral surface side of the hap 41. Nozzles 45 are provided. Here, the cleaning nozzle 45 is arranged at a position slightly opposite to the center of the pitch of the fly 42 as shown in FIG. 1 (left side in FIG. 1) and facing the screen portion 30 in the radial direction. I have.

 Further, in the cleaning liquid receiving section 43, a residual layer cleaning liquid receiving section 46 for receiving a cleaning liquid for cleaning residual layer crystals generated in a gap between the outer peripheral edge of the fly 42 and the inner peripheral surface of the screen section 30 is provided. It is provided separately from the inside of the washing liquid receiving section 43. The residual layer cleaning liquid receiving part 46 is provided with a partition extending at a predetermined width in the axial direction over the entire circumferential direction at both ends of the cylindrical member. 7 is provided so as to protrude, and the cleaning liquid receiving portion 46 for the remaining layer is fixed by the respective connection pipes 47 so as to be separated from the inner peripheral surface of the hub 41 in the cleaning liquid receiving portion 43. As shown in FIG. 1, the connection pipes 47 are arranged at predetermined intervals along the spiral direction of the fly 42 at a position where the inner peripheral edge of the fly 42 is continuous.

 In the present embodiment, at the position where the inner peripheral edge of the fly 42 in the screw conveyor 40 is continuous, inside the hap 41 or the fly 42, the outer peripheral edge of the fly 42 from the inner peripheral side of the hub 41. A plurality of cleaning liquid discharge holes 49 are provided extending in the radial direction to communicate with the connection pipes 47. The cleaning liquid discharge holes 49 together with the connection pipes 47 are used to transfer the cleaning liquid in the residual layer cleaning liquid receiving section 46 from the outer periphery of the fly 42 while being separated from the cleaning liquid receiving section 43. It forms a cleaning path for the residual layer that is jetted directly toward the residual layer crystal on the lean part 30.

Inside the hub 41, a feed tube for supplying a stock solution extending in the axial direction is provided. Move 60 has been purchased. The starting end of the feed tube 60 extends outside from the hub 41 and the bowl 20 to become a stock solution supply port 61, and the end of the feed tube 60 is arranged substantially in the center of the hub 41 and has a stock solution outlet 6. The cleaning liquid is supplied to the cleaning liquid supply pipe 71 for supplying the cleaning liquid to the cleaning liquid receiving section 43 in the feed tube 60 and the cleaning liquid receiving section 46 for the residual layer. And a residual layer cleaning liquid supply pipe 72 forming a residual layer cleaning liquid supply path.

 The starting end of the cleaning liquid supply pipe 71 forms a cleaning liquid supply port 71 a that opens substantially perpendicularly to the axial direction on the starting end side of the feed tube 60. Also, in the middle of the feed tube 60 radially overlapping the cleaning liquid receiving portion 43 in the hub 41, an opening 71b of the cleaning liquid supply pipe 71 is opened substantially at right angles to the axial direction. are doing. On the other hand, the beginning of the residual-layer cleaning liquid supply pipe 72 forms a residual-layer cleaning liquid supply port 72 a that opens substantially perpendicularly to the axial direction on the start end side of the feed tube 60. Also, in the middle of the feed tube 60 radially overlapping the cleaning liquid receiving portion 46 for the residual layer in the hub 41, an opening 72b of the cleaning liquid supply pipe 72 for the residual layer is substantially in the axial direction. It opens at right angles. Next, the operation of the centrifuge 10 according to the first embodiment will be described.

 In FIGS. 1 and 2, the stock solution is supplied into the bowl 20 via a feed tube 60 using a drive source such as a pump. The undiluted solution sent from the undiluted solution supply port 61 of the feed tube 60 is transferred to the hub of the screw compressor 40.

The solution exits from a stock solution outlet 62 located in the vicinity of the center in 41 and is inserted into a dam portion 26 in a bowl 20 to a predetermined depth set in advance. Stock solution is bowl

Under the effect of centrifugal force within 20, the crystals are settled and separated from the mother liquor.

The crystal that settles to the inner peripheral surface side of the bowl 20 due to the action of the centrifugal force is converted into the tapered portion of the powl 20 by the fly 42 of the screw conveyor 40 rotating at a slightly different speed from the bowl 20. Conveyed to 2 and set in advance in dam section 26 The liquid is removed when moving on the inner peripheral surface of the tapered portion 22 to the inner diameter side of the liquid depth, and is further conveyed to the screen portion 30.

 Crystals that have been drained during transportation have impurities and mother liquor themselves generated during the manufacturing process attached to the surface, and crystals that have reached the screen part 30 have the cleaning nozzle 4 Washing is performed by the washing liquid ejected from 5: The washing liquid is generally pure water, acetic acid, pure phenol, sulfuric acid, hydrochloric acid, or the like. The washing liquid is supplied through the washing liquid supply pipe 71 inserted separately into the feed tube 60. The cleaning liquid is supplied to the cleaning liquid receiving part 43 in the hap 41. The cleaning liquid received in the cleaning liquid receiving part 43 is ejected from the cleaning nozzle 45 through the cleaning liquid communication hole 44 in the peripheral wall of the hub 41.

 As described above, the crystal undergoes the washing and dewatering actions in the screen part 30 and is further conveyed to the discharge port 24 side, and the crystal is conveyed to the outer periphery of the fly 42 of the screen conveyor 40. A crystal residual layer is formed in the gap between the screen portion 30 and the inner peripheral surface. The residual layer crystal is directly and locally cleaned by the cleaning liquid sprayed from the outer periphery of the fly 42 in a state of being separated from the cleaning liquid receiving portion 43 by the residual layer cleaning path. In many cases, the cleaning liquid used here is the same as the liquid ejected from the cleaning nozzle 45. The cleaning liquid is supplied through the residual layer cleaning liquid supply pipe 72 separately inserted into the feed tube 60, and the haptic 4 1 It is supplied to the residual layer cleaning liquid receiving part 46 inside.

More specifically, the cleaning liquid in the residual layer cleaning liquid receiving portion 46 is provided at predetermined intervals along the spiral direction of the fly 42 at a position where the inner peripheral edge of the fly 42 is continuous. It passes through the connecting pipe 47 and jumps out into the bowl 20 from the washing liquid discharge hole 49 provided inside the hub 41 or the fly 42. The cleaning liquid discharge holes 49 extend radially from the inner peripheral side of the hub 4 1 to the outer peripheral edge of the fly 4 2. Do not spray the cleaning solution directly on the remaining crystal. Can be.

 As described above, apart from cleaning the entire crystal by the cleaning nozzle 45, the residual layer crystal can be particularly locally and directly cleaned by the residual layer cleaning path, so that the residual layer crystal is not fixed and moves. And the permeability of the cleaning solution to the entire crystal being transported is improved. Therefore, the clogging of the crystal in the screen part 30 can be prevented beforehand, and the amount of the cleaning liquid for replacing the original impurity in the crystal can be suppressed. It is possible to reduce the amount of crystal leakage at 30.

 Moreover, since the cleaning liquid is supplied separately to the cleaning liquid receiving portion 43 and the cleaning liquid receiving portion 46 for the remaining layer while being separated from each other, the amount of the cleaning liquid ejected from the cleaning nozzle 45 and the amount of the remaining liquid Since the amount of the cleaning liquid spouted from the cleaning path can be separately controlled from the outside, adjustment of both the optimum cleaning liquid amount to reduce the replacement rate of crystal cleaning and the amount of leakage Can be easily performed. "

 In the screen part 30, the cleaning liquid ejected from the cleaning nozzle 45 and the residual layer cleaning path passes through the filter medium 31 after washing the crystals and residual layer crystals, and the filtrate is discharged from the discharge hole 25 to the bowl 2 °. Is discharged to the outside. Further, the crystals washed and drained in the screen section 30 are discharged from the discharge port 24 to the outside of the bowl 20, and finally collected from the crystal discharge port 15 in the casing 11. 4 to 6 show a second embodiment of the present invention.

The centrifuge 1 OA according to the present embodiment extends continuously to the tip end surface of the outer periphery of the fly 42 in the first embodiment described above in the spiral direction of the fly 42, A groove 49a is formed in which the tip end of each cleaning liquid discharge hole 49 communicates. For example, the width of the groove 49a may be set to about 1 to 5 mm, and the depth may be set to about 10 to 25 mm. The same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted. According to such a second embodiment, the cleaning liquid discharged from the tip end of each of the cleaning liquid discharge holes 49 spreads over the entire outer peripheral edge of the fly 42 along the groove 49a, and the remaining layer It can be directly extracted so as to spread all over the circumference in the radial direction toward the processing object. This makes it possible to enhance the permeability of the cleaning liquid to the crystals and the mobility of the remaining layer crystals, as in the above embodiments.

 7 and 8 show a third embodiment of the present invention.

 As shown in FIG. 7, the centrifugal separator 10 B according to the present embodiment includes a connection pipe 47 of the residual-layer washing liquid receiving section 46, and a processing object transport surface 4 of the fly 42. At the position adjacent to the surface 4 2b opposite to 2 a, they are arranged at predetermined intervals along the spiral direction of the fly 42, and the connecting pipe 4 is provided on the peripheral wall of the hub 41. A cleaning liquid communication hole 48 for communicating with 7 is provided.

 The surface 42 b of the screw 42 on the opposite side of the processed material transfer surface 42 a of the fly 42 is arranged at predetermined intervals along the spiral direction of the fly 42. A plurality of cleaning liquid discharge pipes 80 extending radially from the inner peripheral edge to the outer peripheral edge of 42 and communicating with the respective cleaning liquid communication holes 48 are attached. The cleaning liquid discharge pipe 80 forms a residual layer cleaning path together with the connection pipe 47 and the cleaning liquid communication hole 48.

 According to such a third embodiment, the cleaning liquid in the residual layer cleaning liquid receiving portion 46 is located at a position adjacent to the surface 42 b of the fly 42 opposite to the processing object transport surface 42 a. A connecting pipe 47 provided at a predetermined interval along a spiral direction of the fly 42, and a hub of the screw conveyor 40.

The cleaning liquid provided at predetermined intervals along the spiral direction of the fly 42 on the surface 42b opposite to the fly 42 passing through the cleaning liquid communication hole 48 provided in 41. It is introduced into the discharge pipe 80.

Each washing liquid discharge pipe 80 extends from the inner peripheral edge of the fly 42 to the outer peripheral edge. The cleaning liquid can be directly ejected toward the residual layer processing object from the distal end port of each cleaning liquid discharge pipe 80 along the outer periphery of the fly 42. According to such a configuration, it is not necessary to form a hole in the fly 42 itself, and the cleaning liquid discharge pipe 80 can be retrofitted to the fly 42, so that it can be manufactured relatively easily. By attaching the cleaning liquid discharge pipes 80 radially at as small an interval as possible, the cleaning liquid can be ejected so as to spread over the remaining layer crystals in all circumferential directions.

 As described above, the embodiments of the present invention have been described with reference to the drawings. According to these specific configurations, it is possible to enhance the permeability of the cleaning liquid to the crystals and the mobility of the remaining layer crystals. However, the present invention is not limited to these embodiments, and it goes without saying that changes and additions without departing from the spirit of the present invention are included in the present invention. Industrial applicability

 ADVANTAGE OF THE INVENTION According to the centrifugal separator which concerns on this invention, since a washing | cleaning liquid can be sprayed directly from the outer periphery of the fry of a screen conveyor to the remaining layer processing thing adhering to the inner peripheral surface of a screen part, Since the mobility of the remaining layer is improved and the permeability of the entire cleaning solution is increased, it is possible to prevent the solidification of the remaining layer by locally cleaning only the remaining layer processed material and increasing the liquid content of the processed material. It becomes.

In addition, when the cleaning liquid is applied to the entire processed material, the amount of the processed material is proportional to the amount of the cleaning liquid passing through the processed material layer, and the amount of the processed liquid is proportional to the opening of the screen. The cleaning liquid is sprayed directly from the outer peripheral edge of the freight to the remaining layer processing material as described above, thereby preventing the remaining layer processing material from sticking to the processing object being transported. Since the permeability of the cleaning solution is improved, the cleaning solution is intended to replace impurities in the original processed product. This makes it possible to reduce the amount, and it is possible to reduce the total leakage amount of the processed material in the screen part.

Claims

The scope of the claims 1. A screw conveyor (40) is provided in the bowl (20), and these are relatively rotatably supported to separate the processed material from the stock solution supplied into the bowl (20). A centrifuge (10, 10) for washing and dewatering the processed material at a screen section (30.) provided along the inner peripheral surface on one end side of the powl (20). A, 10 B), a cleaning liquid receiving part (43) for receiving the cleaning liquid supplied to the hub (41) of the screw conveyor (40), and the cleaning liquid receiving part A centrifuge (.10, 10A, 10B) having a cleaning nozzle (45) for jetting the cleaning liquid in (43) toward the screen section (30). hand,  Remaining layer treatment generated in the cleaning liquid receiving portion (43) in a gap between the outer peripheral edge of the flight (42) of the screw conveyer (40) and the inner peripheral surface of the screen portion (30). A residual layer cleaning liquid receiving section (46) for receiving a cleaning liquid for cleaning an object is provided separately from the inside of the cleaning liquid receiving section (43), and is provided along the spiral direction of the fly (42). The cleaning liquid in the residual layer cleaning liquid receiving section (46) is directed from the outer periphery of the fly (42) toward the residual layer processing material in a state of being separated from the cleaning liquid receiving section (43). A centrifugal separator (10, 10A, 10B) characterized by forming a cleaning path for the residual layer to be directly ejected by using a centrifuge.  2. A screw conveyor (40) is provided in the bowl (20), and these are relatively rotatably supported to separate the processed material from the stock solution supplied into the bowl (20). At the same time, a centrifuge (10, 10A) for washing and dewatering the processed material at a screen portion (30) provided along the inner peripheral surface on one end side of the bowl (20). In the above, the screw conveyor ( Washing that receives the washing liquid supplied to the hub (41) of 40) A centrifuge (1) having a liquid receiving portion (43) and a cleaning nozzle (45) for jetting the cleaning liquid in the cleaning liquid receiving portion (43) toward the screen portion (30). 0, 1 0 A) where,  In the cleaning liquid receiving portion (43), a residual layer formed between the outer periphery of the flight (42) of the screw conveyor (40) and the inner peripheral surface of the screen portion (30). A residual layer cleaning liquid receiving section (46) for receiving a cleaning liquid for cleaning the processing object is provided separately from the inside of the cleaning liquid receiving section (43), and the inner periphery of the fly (42) is continuous. At the position, a connecting pipe (47) is provided at the bottom side of the residual layer cleaning liquid receiving portion (46) at predetermined intervals along the spiral direction of the fly (42), and the screw conveyer is provided. The connecting pipe (47) extends radially from the inner periphery of the hub (41) to the outer periphery of the fly (42) inside the hub (41) or the fly (42) of the (40). Is provided with a washing liquid discharge port (4 9)  The cleaning liquid in the residual-layer cleaning liquid receiving portion (46) is directed toward the residual-layer-processed material from the distal end of each of the cleaning liquid discharge holes (49) opened on the outer periphery of the fly (42). A centrifuge (10, 10A;) characterized by direct ejection. 3. Equipped with a screw conveyer (40) in the bowl (20), which is relatively rotatably supported, and separates the processed material from the stock solution supplied into the bowl (20). And a centrifugal separator (10B) for washing and dewatering the processed material at a screen part (30) provided along the inner peripheral surface on one end side of the bowl (20). A cleaning liquid receiving portion (43) for receiving the cleaning liquid supplied therein and a cleaning liquid in the cleaning liquid receiving portion (43) are supplied to the hub (41) of the screw conveyor (40) by the cleaning portion (43). A centrifuge (10B) having a washing nozzle (45) emerging toward 30). In the cleaning liquid receiving portion (43), a residual layer formed between the outer periphery of the fly (42) of the screw conveyor (40) and the inner peripheral surface of the screen portion (30). A residual layer cleaning liquid receiving section (46) for receiving a cleaning liquid for cleaning the processing object is provided separately from the inside of the cleaning liquid receiving section (43), and a processing object transport surface of the fly (42) is provided. At a position adjacent to the surface (42b) opposite to the surface (42a), at predetermined intervals along the spiral direction of the fly (42), the cleaning liquid receiving portion for the residual layer (46) ), A connection pipe (47) is provided on the bottom side, and a cleaning liquid communication hole (48) for connecting the connection pipe (47) to the hub (41) of the screw conveyor (40) is provided.  Radiation is made from the inner peripheral edge to the outer peripheral edge of the fly (42) at predetermined intervals along the spiral direction of the fly (42) on the opposite surface (42b) of the fly (42). A cleaning liquid discharge pipe (80) that extends in the direction and communicates with the cleaning liquid communication hole (48).  A centrifugal separator characterized in that the cleaning liquid in the residual-layer cleaning liquid receiving section (46) is jetted directly from the distal end port of the cleaning liquid discharge pipe (80) toward the residual-layer processed material. 1 0 B).  4. A groove extending continuously in the helix direction of the flyt (42) to the tip end surface of the outer periphery of the flyt (42), and communicating with the tip end of each of the cleaning liquid discharge holes (49). 3. The centrifugal separator (10A) according to claim 2, wherein (49a) is formed.  5. Insert the feed tube (60) for supplying the undiluted solution extending in the axial direction into the hub (41) of the screw conveyor (40). A cleaning liquid supply path (71) for supplying a cleaning liquid to the cleaning liquid receiving section (43) is formed in the feed tube (60), and a radial direction with respect to the cleaning liquid receiving section (43) is formed. An opening for the cleaning liquid supply path (71) is provided in the middle of the feed tube (60) overlapping the In the feed tube (60), a residual layer cleaning liquid supply path (72) for supplying a cleaning liquid to the residual layer cleaning liquid receiving part (46) is formed, and the residual layer cleaning liquid receiving part (46) is formed. 3. An opening for the residual layer cleaning liquid supply path (72) is provided in the middle of a feed tube (60) radially overlapping with (1), (2) and (3). Centrifuge (10, 10A, 10B) according to paragraph 3 or 4.