JPH0725920U - Separation device - Google Patents

Abstract

(57) [Summary] [Object] To enable a cleaning device for backwashing a filter element to be compactly housed in a casing in a separation device for collecting dust by passing dust-containing gas to a filter element housed in a casing. [Structure] An air tank 23 is detachably attached to a central portion of an inner surface of an upper casing 2, and an injection nozzle facing an upper end opening of each filter element 13 is attached to a pipe 26 radially extending from the air tank 23. With this structure, each filter element 13 can be arranged in an arbitrary shape inside the casing 1, and by arranging the injection nozzles radially from the air tank 23, the cleaning air having a uniform pressure can be injected from each injection nozzle.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a separation device used for collecting powder in a classification plant, collecting harmful dust in a production line, and collecting excess powder in a powder coating application system.

[0002]

[Prior art]

 Usually, in a classification plant, the gas exhausted from the classifier contains a large amount of dust and excess powder that is not classified.Therefore, the exhaust gas is introduced into a separation device to remove dust from the gas and clean it. It is discharged as gas.

As a separating device used for collecting the dust, there has been a device proposed by Japanese Utility Model Publication No. 1-15822.

As shown in FIG. 8, this apparatus is provided with a plurality of filter elements 42 inside a casing 41, and dust particles in the gas are removed by passing dust-containing gas through the filter elements 42. The clean air is discharged from the discharge port 43 at the top of the case.

By the way, in this type of separation device, in order to avoid clogging of the filter element, it is necessary to frequently clean the filter element.

In order to deal with such cleaning of the filter element, in the above-mentioned proposed apparatus, as shown in FIG. 8, an air tank in which an air supply pipe 44 traversed inside the casing 41 is arranged outside the casing 41 is used. A plurality of air injection nozzles 45 are formed in the air supply pipe 44 in the length direction, and each of the injection nozzles 45 faces the upper end opening of each filter element 42. With this structure, by injecting high-pressure air from each nozzle 45 into the filter element 42, the dust attached to the outer periphery of each filter element 42 can be blown off and blown off from the filter element 42.

[0007]

[Problems to be solved by the device]

 However, in the structure in which the air supply pipe 44 is horizontally penetrated from the outside to the inside of the casing 41 like the above-mentioned conventional device, a large number of air injection nozzles 45 are provided along the length direction of the air supply pipe 44. Therefore, the arrangement shape of the filter element 42 is also restricted accordingly, and the arrangement of each filter element 42 becomes inefficient, which is necessary for storing the filter in the internal space of the casing 41. There is a problem that the cross-sectional area of the space becomes large.

Further, since the air tank 46 is largely exposed to the outside of the casing 41, an extra space is required when the separation device is installed, and the inspection space or the like may be restricted.

Further, in the structure in which the air injection nozzles 45 are arranged in the length direction of the air supply pipe 44 as described above, the air pressure is low in the nozzle 45 close to the air introduction side, and the air pressure decreases as the distance increases. Becomes higher. For this reason, there is a problem that the air pressure ejected from each nozzle 45 to each filter element 42 varies, and a stable dust removal effect cannot be obtained.

Further, as the conventional filter element 42, in order to increase the collecting area of the filter, a large number of cylindrical filter passages are arranged in an annular shape as shown in FIG. 5, and each filter passage has a pleated shape. There are those in which the inner peripheral surface and the outer peripheral surface are used as filtration surfaces. When such a filter element is used in the separation device shown in FIG. 8, in the structure in which the air injection nozzle 45 is simply exposed to the upper end of the filter element, most of the air ejected from the nozzle 45 is at the center of the filter element. There is a problem that the particles collide with the protrusions arranged in the above and are dispersed, and almost no air is introduced into the inside of each filter passage, resulting in an insufficient dust removal effect.

Therefore, the present invention solves the above problems, allows a large number of filter elements to be efficiently arranged inside the casing, and can introduce high-pressure cleaning air of uniform pressure into each filter element, and a large number of filter elements can be introduced. It is an object of the present invention to provide a separating device that can be applied to a filter element in which the filter passages are arranged in a ring.

[0012]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a first means of the present invention is to provide a partition plate for partitioning the inside of the casing into upper and lower parts, and to the partition plate, a plurality of filter elements having upper ends opened, The air injection nozzle connected to the air tank faces the upper opening of each filter element, the dust-containing gas inlet is provided in the casing below the partition plate, and the clean air outlet is provided in the upper casing. The air tank is attached to the inside of the casing so as to be located substantially at the center of the arrangement shape of the filter elements, and the injection nozzle is connected to a pipe extending radially from the air tank.

The second means is that the casing is divided into upper and lower parts at the position of the partition plate, and the air tank, the pipe and the injection nozzle are integrally and detachably mounted in the upper casing.

Further, the third means is to provide a tapered sleeve having a diameter expanding toward the filter element between the injection nozzle and the filter element, and between the upper end opening of the sleeve and the injection nozzle. A gap was provided to allow air to flow in.

A fourth means forms the filter element by arranging a large number of cylindrical filter passages in an annular shape, and forms a space inside the filter element surrounded by the filter passages inside the sleeve. A conical projection that closes was provided, and the injection nozzle was annularly arranged along the circumference of the projection.

[0016]

[Action]

 In the above first means, by mounting the air tank inside the casing so as to be the center of the arrangement of each filter element, each filter element can be arranged in an arbitrary shape inside the casing, and a small space is required. It can be efficiently stored in the casing. Further, by providing the air injection nozzles in the pipes extending radially from the air tank, the air pressure acting on each nozzle becomes almost uniform, and the uniform effect of removing the air can be obtained. Further, the air tank is housed in the casing, and the protrusion to the outside of the casing is eliminated, so the installation space for the separator is reduced.

Further, if the air tank can be attached to and detached from the casing together with the pipe and the air injection nozzle as in the second means, the work of attaching the air tank or the like can be facilitated, and each nozzle or air tank for each filter element can be easily attached. The alignment of can also be easily performed with the device removed from the separation device.

On the other hand, in the third means, when the compressed air is injected from the air injection nozzle into the inside of the tapered sleeve, the air is sucked into the inside of the sleeve from the gap between the nozzle and the end portion of the sleeve by the ejector effect, and the amount is increased. Air is introduced from the sleeve into the interior of the filter element.

Further, when the fourth means is adopted, the compressed air introduced into the sleeve from the air injection nozzles arranged annularly is annularly arranged from the opening at the lower end of the sleeve by the conical projection. The filter is smoothly introduced into the upper opening of each filter material for effective cleaning operation.

[0020]

【Example】

 An embodiment of the present invention will be described below with reference to the attached FIGS. As shown in FIGS. 1 and 2, the casing 1 is divided into an upper casing 2 and a lower casing 3 having a lower end opened, and a plurality of support legs 4 are attached to the lower casing 3.

The upper casing 2 and the lower casing 3 are detachably coupled to each other by a turnbuckle type coupling fitting 5 provided on the outer periphery of the divided portion, and a dust-containing gas inlet is provided on the outer periphery of the lower casing 3. 6, clean air discharge ports 7 are provided on the outer periphery of the upper casing 2.

A partition plate 8 for partitioning the inside of the casing 1 into upper and lower parts is attached to a divided portion of the upper casing 2 and the lower casing 3. An annular protrusion 9 is integrally provided on the outer peripheral edge of the partition plate 8. An annular packing 10 is provided on the outer periphery of the upper casing 2 and the lower casing 3 in a state where the casing 1 is connected to the protrusion 9. 11 closely adheres to each other, and the inside of the casing 1 is hermetically sealed.

As shown in FIG. 3, a plurality of through holes 12 are formed in the partition plate 8 at substantially equal distances from the center, and each of the through holes 12 has a filter element 13 and a tapered sleeve 17 respectively. Is installed.

As shown in FIGS. 3 to 6, this filter element 13 has two filter materials 14 a and 14 b formed in a continuous corrugation by press working, and the convex portions of the corrugation are joined to face each other. The joined material is formed into an annular shape, and a large number of cylindrical filter passages 14 are annularly arranged between the filter materials 14a and 14b. And the outer peripheral surface is used as the filtration surface. Further, a packing frame 15 is joined to the outer periphery of the upper end of each filter material 14, and the filter element 13 is fixed to the partition plate 8 by the packing frame 15. Each of the filter materials 14a and 14b is formed of a polyester needle felt or the like having a self-shape retaining property, and has an upper end opened and a lower end closed.

It should be noted that instead of the filter element 13 having the above-described shape, a general cylindrical shape formed of a fiber, plastic, metal or the like having a shape-retaining property with only the inner peripheral surface or only the outer peripheral surface as a filtering surface. Filter elements can also be used.

A flange plate 18 fitted to the outside of the packing frame 15 and a presser plate 16 are attached to the outer circumference of the lower end of the tapered sleeve 17, and the flange plate 18 is fitted to the packing frame 15. Then, the pressing plate 16 is fastened to the partition plate 18 with bolts and nuts, so that it is fixed while being positioned above the filter element 13. Both upper and lower ends of the sleeve 17 are open, and a reduced diameter portion 17a is provided near the upper end, and the diameter is expanded in a trumpet shape from the reduced diameter portion 17a toward the lower end.

Further, a conical projection 19 protruding toward the inside of the sleeve 17 is attached to the inner circumference of the upper end of each of the filter materials 14 a and 14 b of the filter element 13. The surface of the protrusion 19 is a tapered surface having an inclination angle substantially the same as the enlarged diameter portion 17b of the sleeve 17, and the protrusion 19 allows the inside of the sleeve 17 to communicate with the upper end opening of the filter element 13. An annular passage 20 is formed. The projection 19 closes the upper end of the space 21 formed inside each filter passage 14 of the filter element 13, and the interior of the sleeve 17 and the space are blocked by the projection 19.

The protrusions 19 and the packing frame 15 mounted on the inside and the outside of the filter element 13 are made of resin, and are integrally formed around the upper end of the filter element 13 by a mold or the like. As a result, as shown in FIG. 5, the protrusion 19 and the packing frame 15 fill the gaps formed in the inner and outer circumferences of the filter materials 14a and 14b, and the annular passage 20 of the sleeve 17 and each filter passage 14 communicate with each other in an airtight state. Is formed.

On the other hand, a reinforcing plate 22 is attached to the upper end of the upper casing 2 at the center of the casing 1, and an air tank 23 is detachably attached to the inner surface of the reinforcing plate 22 using bolts 24. . A connection pipe 25 protruding to the outside of the casing 1 is attached to the upper portion of the air tank 23, and a compressed air replenishing device (not shown) installed outside the device is connected to the connection pipe 25. Has become.

A plurality of pipes 26 extending radially toward the filter elements 13 are attached to the peripheral surface of the air tank 23, and backwash valves 27 are attached to the ends of the pipes 26, respectively. . A large number of air injection nozzles 29 facing the upper end openings 28 of the sleeves 17 are provided on the discharge side of the respective backwash valves 27. By opening the backwash valves 27, the nozzles 29 are inserted into the sleeve 17. Compressed air is blown in and high pressure air is introduced into the inside of the annular filter element 13 through the sleeve 17.

The plurality of injection nozzles 29 are arranged along an annular passage 20 formed inside the sleeve 17 by a conical projection 19 as shown in FIG. The air thus blown out smoothly from the passage 20 of the sleeve 17 toward the upper end openings of the filter materials 14a and 14b.

The upper end opening 28 of each sleeve 17 facing each nozzle 29 is formed with a diameter larger than the outer diameter of the nozzle 29, and an annular shape through which air flows between the nozzle 29 and the upper end peripheral edge of the sleeve 17. A gap 30 is formed.

The separating apparatus of this embodiment has the structure as described above, and when dust-containing gas is supplied from the inlet 6 into the lower casing 3, the dust-containing gas is discharged from the space outside each filter element 13. Dust contained in the gas enters the inside and is collected on the outer circumference of each of the filter materials 14a and 14b. The clean air that has passed through the filter element 13 rises inside the filter passages 14 of the filter element 13, flows into the upper casing 2, and is discharged from the discharge port 7.

On the other hand, when cleaning the filter element 13, the backwash valve 27 above the filter element 13 to be cleaned is opened, and compressed air having a higher pressure than the air tank 23 is injected from the injection nozzle 29 to the inside of the sleeve 17. To spray.

When the high-pressure air is thus injected into the sleeve 17 in a conical annular shape, a negative pressure is generated in the surroundings by the air injection flow, so that the external air is discharged from the gap 30 between the nozzle 29 and the sleeve 17 by the ejector effect. It is sucked into the sleeve 17.

The jet flow accompanied by the suction air due to the ejector effect is branched into the annular passage 20 along the conical projection 19 inside the sleeve 17, and all the air is leaked to the sleeve 17 without leaking to the outside. Is introduced into the inside of each filter material 14a, 14b of the filter element 13 from the lower end.

Therefore, in the inside of the filter element 13, a violent flow due to the jet flow and the expansion accompanied thereby occur, and the air action blows away the dust adhering to the outer periphery of each filter passage 14.

In the structure of the above-described embodiment, since the air injection nozzles 29 are attached to the pipes 26 radially extending from the air tank 23, compressed air of a constant pressure is always supplied from the air tank 23 to each nozzle 29. Therefore, it is possible to obtain a stable cleaning effect by the high pressure air for each filter element 13.

Further, when the air tank 23 is removed from the upper casing 2, the cleaning devices such as the backwash valve 27 and the air injection nozzle 29 can be taken out from the casing 1 as a unit, so that inspection, replacement, and cleaning of them are possible. It is possible to easily perform such work. On the contrary, when the air tank 23 is attached to the upper casing 2, the backwash valve 27 and the air injection nozzle 29 are also mounted at a fixed position at the same time, and therefore the backwash valve 27 and the nozzles are removed from the casing 1. By positioning 29 in the air tank 23 and attaching the air tank 23 to the separating device, each nozzle 29 can be accurately arranged at a position that optimally faces each filter element 13.

FIG. 7 shows another embodiment in which the filter has a larger filtering area. In this example, a plurality of filter elements 31 are annularly arranged outside the filter element 13 arranged concentrically adjacent to the air tank 23, and two filter elements are provided in a pipe 32 radially extending from the air tank 23. Two nozzles 33 facing 31 are connected.

Arrangement of such a filter element can be selected arbitrarily as long as the air tank 23 is located at the center of the arrangement shape. It is also possible to connect three or more nozzles 33 to the pipe 32 extending from the air tank 23 and wash the three or more filter elements 31 simultaneously by operating the backwash valve 27.

Although the air tank 23 is attached to the reinforcing plate 22 fixed to the upper casing 2 in the above-described embodiment, the lid plate to which the cleaning device such as the air tank 23 is attached is attached to the upper casing 2. It may be detachably attached. Further, in the case of a large-sized separating device, a cleaning device such as an air tank becomes large in size, so that the cleaning device may be mounted as a set on the partition plate 8.

Further, the filter element 13 and the sleeve 17 may be integrally fixed to the partition plate 8.

[0044]

【effect】

 As described above, in the present invention, the air tank is arranged in the center of the filter element in the casing, so that the filter elements can be efficiently housed in the casing in any arrangement, and the separating device is formed in a compact shape. be able to.

Further, since the air injection nozzles are radially arranged from the air tank, the cleaning air can be blown out to each filter element with a uniform pressure, and a stable filter cleaning operation can be obtained.

Further, like the second means, if the air tank, the pipe and the injection nozzle are integrally removable from the casing, the cleaning device can be easily replaced or repaired, and the position of the injection nozzle with respect to the filter element can be aligned. Work can be done easily and accurately.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a separation device according to an embodiment.

2 is a view of the inside of the casing of FIG. 1 as seen from above.

FIG. 3 is an enlarged cross-sectional view showing a main part of FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a perspective view showing a filter element.

FIG. 6 is a plan view seen from the line VI-VI in FIG.

FIG. 7 is a transverse plan view showing another embodiment.

FIG. 8 is a vertical sectional front view showing a conventional example.

[Explanation of symbols]

 1 Casing 2 Upper casing 3 Lower casing 6 Inlet 7 Discharge port 8 Partition plate 13, 31 Filter element 14 Filter passage 14a, 14b Filter material 19 Protrusion 20 Passage 23 Air tank 26, 32 Piping 27 Backwash valve 29, 33 Air injection nozzle 30 gap

Claims (4)

[Scope of utility model registration request] 1. A casing is provided with a partition plate for partitioning the interior into upper and lower parts, and a plurality of filter elements having upper ends opened are attached to the partition plate, and the upper end openings of the respective filter elements are respectively connected to air tanks. In the separation device in which the air injection nozzle is faced, the dust-containing gas inlet is provided in the casing below the partition plate, and the clean air outlet is provided in the upper casing, the air tank is provided inside the casing. A separating device, characterized in that the filter element is mounted so as to be positioned substantially in the center of the arrangement shape, and the injection nozzle is connected to a pipe radially extending from the air tank. 2. The casing according to claim 1, wherein the casing is divided into upper and lower parts at a position of a partition plate, and the air tank, the pipe and the injection nozzle are integrally and detachably mounted in an upper casing thereof. Separation device. 3. A tapered sleeve having a diameter increasing toward the filter element is provided between the injection nozzle and the filter element, and a gap into which air flows is provided between an upper end opening of the sleeve and the injection nozzle. The separation device according to claim 1 or 2, wherein 4. A conical projection for forming the filter element by arranging a large number of cylindrical filter passages in an annular shape and closing a space inside the filter element surrounded by the filter passages inside the sleeve. 4. The separation device according to claim 3, wherein the injection nozzle is arranged annularly along the circumference of the protrusion.