JP2016120469A - Filter, and dust collector including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture simply and inexpensively a Venturi tube through which gas for backwash flows, and to reduce maintenance cost, in a filter mounted on a partition wall for partitioning a collection chamber into which gas including powder flows from a clean chamber into which clean gas is collected.SOLUTION: A resin-molded cylindrical filter boss 12 is connected to the end of the opening side of a bottomed cylindrical filter medium 11, and a Venturi part 15 through which gas for backwash flows is formed integrally inside the filter boss 12.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a filter for collecting powder in gas and a dust collector equipped with the filter.

  In a dust collector, which is an example of a collecting device that separates and collects powder from gas containing powder such as fine dust, for example, as shown in Patent Document 1, gas containing powder A bottomed cylindrical filter is attached to the partition wall that separates the collection chamber into which clean gas is collected and the clean gas obtained by filtering the powder through the filter is taken out through the clean chamber. The high-pressure gas that is intermittently ejected from the injector tube in the clean chamber is blown into the filter through the venturi tube supported by the partition wall, so that air is efficiently blown into the filter by the outside air attraction of the venturi tube. There is known a device equipped with a pulse jet type backwashing means for effectively blowing off and removing the powder adhering to the filter to the collection chamber side.

JP 2010-75902 A

  The Venturi tube having a constricted middle portion is a straight metal tube formed by a spatula drawing process or the like, and thus requires a lot of processing and becomes a costly part.

  In addition, when the gas to be dust-removed is a corrosive gas containing SOx, hydrogen chloride, etc., the thin tip of the Venturi tube is corroded in a relatively short period of time and is likely to be deformed or missing. Therefore, it was necessary to replace the expensive Venturi tube, and the maintenance cost was high.

  In particular, when the venturi pipe is fixed to the partition wall by welding, the replacement of the venturi pipe becomes large.

  The present invention has been made paying attention to such a situation, and a filter capable of easily and inexpensively manufacturing a venturi tube and contributing to a reduction in maintenance cost, and a dust collector equipped with the filter The purpose is to provide.

  In order to achieve the above object, the present invention is configured as follows.

  (1) The filter of the present invention is a filter attached to a partition wall that partitions a collection chamber into which a gas containing powder flows and a clean chamber in which clean gas is collected, and is an opening in a bottomed cylindrical filter medium A cylindrical filter boss molded with resin is connected to the end portion on the side, and a venturi portion for allowing the backwash gas to flow is integrally formed inside the filter boss.

  According to the present invention, since the venturi part is integrally formed with the filter boss, the metal tube is not required to be troublesome to form a venturi part by performing a spatula drawing process, and has a venturi function for backwashing. The filter can be manufactured easily and inexpensively.

  In addition, since the filter itself that is replaced in a timely manner is equipped with a venturi section, the venturi section becomes new each time the filter is replaced, and there is no need to consider the corrosion of the venturi section, making it suitable for dust removal treatment of corrosive gas. It can be carried out.

(2) In one embodiment of the present invention, the powder is a product powder, the concentration of the product powder contained in the gas is 5 g / m ³ or more, and the filter medium is pleated. While being bent, the pleat angle is 15 ° or more and 45 ° or less.

In the dust collector for product collection, the concentration of the product powder contained in the gas is as high as 5 g / m ³ or more compared to the environmental dust collection, and the pleated filter is likely to be clogged and difficult to use. However, according to this embodiment, by setting the pleat angle to 15 ° or more and 45 ° or less, clogging can be suppressed and a pleat type filter can be suitably used.

  (3) In a preferred embodiment of the present invention, the filter boss is made of an elastically deformable resin material and can be externally fitted to a filter support member attached to the partition wall. The periphery includes an engaging portion that elastically engages with an engaging portion provided on the outer periphery of the filter support member.

  According to this embodiment, the filter can be mounted in a state where it is correctly positioned on the filter support member by utilizing the elasticity of the filter boss.

  (4) In another embodiment of the present invention, the engagement state between the engagement portions is maintained by preventing the filter boss from being deformed outward by tightening a tightening band attached to the outer periphery of the filter boss. To do.

  According to this embodiment, the filter externally fitted to the filter support member can be firmly fixed and held at an appropriate connection position, and the filter support member and the filter boss are brought into close contact with each other by tightening, so that the gas is short-circuited and the filter inside Can be prevented.

  (5) In still another embodiment of the present invention, the tightening band includes a tightening hook lever, and can be switched between a tightening state and a tightening release state by forward and reverse rotation exceeding the dead point of the hook lever.

  According to this embodiment, the filter can be easily fixed and released from the filter support member by the forward / reverse rotation operation of the hook lever, and the filter can be easily replaced.

  (6) In another embodiment of the present invention, the filter boss includes a screw portion for screwing and mounting to a filter support member attached to the partition wall.

  According to this embodiment, the filter can be easily and quickly detached from the filter support member.

  (7) In still another embodiment of the present invention, the screw portion is a multiple thread.

  According to this embodiment, the filter can be attached to the filter support member by screwing evenly over substantially the entire circumference with few rotation operations less than one round, and the filter can be attached and detached more easily and quickly. be able to. For example, when the four-thread screw is used, the filter support member can be securely attached to the filter support member in a state of being screwed over substantially the entire circumference only by tightening and rotating the filter by about 90 degrees, which is a quarter of the entire circumference. Can be linked.

  (8) In another embodiment of the present invention, a mounting flange having a larger diameter than the filter mounting hole formed in the partition wall is provided in the filter boss, and the filter can be inserted into the filter mounting hole from the clean chamber side. did.

  According to this embodiment, it is possible to mount the filter by dropping it into the partition wall from above without mounting a filter support member for each filter mounting hole of the partition wall, simplifying the filter mounting operation and reducing the number of filters. This eliminates the need for the filter support member, thereby reducing the number of parts and reducing the cost.

  (9) The dust collector of the present invention partitions the collection chamber into which the gas containing the powder flows and the clean chamber into which the clean gas is collected with a partition provided with a filter, and the gas in the collection chamber passes through the filter. And a dust collector equipped with a backwashing means for supplying a backwashing gas toward the inside of the filter in the cleanroom, wherein the filter is the above (1) Or any one of the filters (8).

  According to the present invention, a filter having a venturi function for backwashing can be manufactured easily and inexpensively, and a dust removal treatment of corrosive gas can be suitably performed.

  Thus, according to the present invention, it is possible to provide a filter that can easily and inexpensively manufacture a venturi tube and contribute to a reduction in maintenance cost, and a dust collector including the filter.

It is a vertical front view which shows schematic structure of a dust collector. It is a partial longitudinal cross-sectional front view of the filter fixed by mounting. It is a front view of the filter fixed by mounting. It is a cross-sectional top view which shows the clamping mounting site | part of a filter. It is a perspective view of a fastening band. It is a partially longitudinal front view of a conventional example. It is a partial longitudinal cross-sectional front view of the filter mounted and fixed by other mounting structures. It is a top view of the filter attachment structure of FIG. It is a figure which shows the structure of a pleated filter. It is a figure which shows the relationship between the operation time t of the filter from which a pleat angle differs, and filter differential pressure (DELTA) P. It is a figure which shows the relationship between the pleat angle (theta) of the filter of FIG. 10, and filter total surface area ratio S / So. It is a front view of the filter mounted and fixed by another tightening mechanism. It is a cross-sectional top view which shows a clamp | tightening mounting | wearing site | part. It is a perspective view of a fastening band. It is a cross-sectional top view which shows the clamping mounting site | part provided with the other clamping mechanism. It is a front view of a fastening band. It is a cross-sectional top view which shows the clamping mounting site | part provided with the other clamping mechanism. It is a front view which shows a clamp | tightening mounting | wearing site | part. It is a cross-sectional top view which shows the clamping mounting site | part provided with the other clamping mechanism. It is a front view which shows a clamp | tightening mounting | wearing site | part. It is a cross-sectional top view which shows the clamping mounting site | part provided with the other clamping mechanism. It is a front view which shows a clamp | tightening mounting | wearing site | part. It is a vertical front view which shows a fastening band positioning structure. It is a partially cutaway front view showing another embodiment of the tightening band positioning structure. It is a partial longitudinal cross-sectional front view of the filter mounted and fixed by another mounting structure. It is a partial longitudinal cross-sectional front view of the filter mounted and fixed by another mounting structure. It is a top view of a filter. It is the schematic which shows various types of the supply and discharge form of the gas containing powder.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal front view showing a schematic configuration of the dust collector. This dust collector purifies gas containing powder such as fine dust discharged from various facilities, and a vertical cylindrical casing 1 is partitioned by partition walls 2 at the top and bottom, A collection chamber 3 into which the contained gas flows from the inlet 1a is formed below the partition wall 2, and a clean chamber 4 is formed above the partition wall 2 where the purified gas is recovered and taken out from the outlet 1b. Yes. Filter mounting holes 2a are formed at a plurality of locations of the partition wall 2, and a plurality of filters 5 for filtering and collecting powder from gas flowing from the collection chamber 3 to the clean chamber 4 are collected in each filter mounting hole 2a. It is deployed in the collection room 3.

  The clean chamber 4 is connected to the blower 6 so as to suck and send the purified gas, and a nozzle tube 7 serving as a backwashing mechanism is provided inside the clean chamber 4. The collected air is blown into each filter 5 from the inside, and the collected powder is backwashed and separated from the filter 5 and collected in a funnel-like hopper 8 provided at the lower portion of the collection chamber 3. The powder collected in the hopper 8 is configured so that it can be taken out of the machine in a timely manner through a rotary valve 9 provided at the lower end of the hopper 8.

  FIG. 2 shows an example of an attachment structure for attaching the filter 5 to the vent hole 2 a of the partition wall 2. In this mounting structure, a cylindrical filter support member 10 made of a metal material is welded and fixed to the vent hole 2 a of the partition wall 2.

  In the filter 5 of this embodiment, a pleated filter medium 11 formed into a cylindrical shape having a substantially star-shaped cross section in which the ridges are continuous in the circumferential direction is used, and an elastically deformable material such as soft resin or rubber, for example, A filter medium 11 made of nonwoven fabric or the like is inserted into the lower end portion of the filter boss 12 made of urethane resin, and is welded or bonded and fixed. Further, the lower end of the filter medium 11 formed in a cylindrical shape is closed with a bottom cap 13, and a retainer 14 formed in a cylindrical basket shape with a hard resin material is provided on the inner periphery of the filter medium 11, so The filter medium 11 is prevented from being deformed by the pressure.

  In this embodiment, the filter boss 12 is curved and bulged at the inner periphery, and the venturi portion 15 is integrally formed. The venturi unit 15 functions to attract the air on the clean chamber 4 side into the filter 5 by blowing in intermittently ejected air from the nozzle tube 7, and from the inside of the filter 5 to the collection chamber 3. A large amount of air is caused to flow toward the filter, and the filter 5 is backwashed efficiently. That is, it has the same function as a conventional Venturi tube.

  An engagement groove 16 is formed in an annular shape on the outer periphery of the filter support member 10, and an engagement protrusion 17 is formed in an annular shape on the inner periphery of the filter boss 12. The filter boss 12 is externally press-fitted into the filter support member 10 from below, and the engagement protrusion 17 that is elastically expanded and deformed is elastically engaged with the engagement groove 16, so that the filter 5 is supported by the filter. The member 10 is mounted and supported at a predetermined height position.

  A conventional Venturi tube formed by drawing a straight metal pipe with a spatula also serves as the filter support member 10 and extends downward from the partition wall 2 longer than the filter support member 10. For this reason, when externally fitting a conventional filter to the venturi tube from below, the filter boss tends to come into contact with the constricted shape of the venturi tube, and it takes time to mount many filters. In the filter 5 according to the embodiment, the venturi 15 is integrally formed with the filter boss 12, so the filter boss 12 of the filter 5 is externally fitted to the short cylindrical filter support member 10 extending downward from the partition wall 2. What is necessary is just to mount | wear, and mounting | wearing is easy.

  After the filter 5 is mounted on the filter support member 10, the tightening band 18 is positioned outside the engagement portion between the engagement groove 16 and the engagement protrusion 17, and is wound around the outer periphery of the filter boss 12. Then, by tightening the tightening band 18 as described later, the filter boss 12 can be firmly mounted and fixed at a predetermined position by preventing the filter boss 12 from expanding in diameter.

  Further, the inner periphery of the filter boss 12 tightened by the tightening band 18 is crimped to the outer periphery of the filter support member 10, and the collection chamber 3 and the inside of the filter can communicate with each other without passing through the filter medium 11. Is prevented. In particular, the engagement protrusion 17 of the filter boss 12 is press-fitted into close contact with the engagement groove 16 of the filter support member 10 to provide a high sealing function.

  3 is a front view of the band tightened state, FIG. 4 is a transverse plan view of the band tightened state, and FIG. 5 is a perspective view of the tightening band 18.

  The tightening band 18 of this embodiment is made of a thin metal strip longer than the circumference of the filter boss 12 and is configured to be wound and fastened by a tightening mechanism 20 provided over both ends thereof.

  The tightening mechanism 20 is configured in a buckle system. Specifically, a hook lever 22 made of a thick plate material is pivotally supported around a fulcrum a so as to be pivotable inward and outward on a bifurcated fulcrum bracket 21 welded and fixed to the outer surface on one end side of the tightening band 18. A rectangular loop-shaped locking member 24 is pivotally connected to the outer surface of the other end 18 with a fulcrum bracket 23 so as to be rotatable around a fulcrum b.

  According to this tightening mechanism 20, the loop free end portion of the locking member 24 is locked by the hook portion 25 of the hook lever 22 rotated outward, and the locking point between the locking member 24 and the hook lever 22 is locked. By rotating the hook lever 22 inward until c exceeds a dead point D indicated as a winding tangent passing through the fulcrum b, the tightening band 18 wound around the filter boss 12 is tightened, and The hook lever 22 rotated to the tightening position beyond the dead point D is urged to rotate in the tightening rotation direction by the band tension, so that the tightened state is maintained.

  In this case, tightening is maximized when the hook lever 22 exceeds the dead point D, and tightening is slightly reduced when the hook lever 22 is rotated to the tightening position beyond the dead point D. The boss 12 itself elastically shrinks and deforms to allow the hook lever 22 to exceed the dead point. When the hook lever 22 exceeds the dead point D, the filter boss 12 is elastically restored in the diameter increasing direction. As a result, a predetermined tightening state without slack is brought about.

  As described above, in this embodiment, the filter boss 12 to be tightened is formed of an elastically deformable material, and the tightened state is maintained by using the elasticity of the filter boss 12 itself. In order to prevent the occurrence of slack, it is possible to provide a simple configuration that does not require the provision of a spring material or the like, and the tightening function does not deteriorate even when the spring material is used repeatedly.

  Further, in this embodiment, the tightening band 18 prevents the hook lever 22 rotated to the tightening position beyond the dead point D from being inadvertently rotated in the slack direction due to vibration during operation or the like. A lever lock mechanism 26 is provided.

  That is, a bifurcated fixing and locking portion 27 is welded and fixed to the outer surface of the tightening band 18 separately from the fulcrum bracket 21. The fixed locking portion 27 is installed so that the free end portion of the hook lever 22 rotated to the tightening position is inserted. Further, the hook lever 22 has a lock hole 28 as shown by an imaginary line in FIG. 4, and the fixed engagement portion 27 has a lock hole 29 as shown in FIG. 5, and the fixed engagement portion 27 of the hook lever 22. In the inserted state, the through holes are formed so as to overlap each other. After the hook lever 22 is turned to the tightening position, the lock pin 30 is inserted and fixed over the overlapping lock holes 28 and 29. Accordingly, a lever lock mechanism 26 having a pin lock structure that prevents the hook lever 22 in the tightening position from rotating in the slack direction is configured. In addition, if the lock pin 30 is connected to the fixed locking part 27 via the chain 31 as shown in FIG.

  When removing the filter 5 for maintenance such as cleaning or replacement of the filter 5, the lock pin 30 is removed from the lock holes 28 and 29 to release the lever lock, and the hook lever 22 is moved beyond the dead point D. Then, the winding of the tightening band 18 is released by rotating it largely in the slack direction. Next, the filter 5 is pulled down strongly, so that the portion of the filter boss 12 where the engagement protrusions 17 are formed is elastically expanded and deformed, and the filter 5 is separated from the engagement groove 16. Unplug from.

  In the filter 5 of this embodiment, since the venturi 15 is integrally formed with the filter boss 12, a laborious process such as forming the venturi 15 by applying a spatula to the straight metal pipe is not required, and backwashing is performed. A filter having a venturi function can be easily and inexpensively manufactured.

  Also, the filter 5 is replaced as needed, but since the filter 5 itself is provided with a venturi section 15, the venturi section 15 becomes new each time the filter 5 is replaced, like a conventional venturi pipe. Therefore, it is not necessary to consider the corrosion, and therefore, dust removal treatment of a corrosive gas such as SOx or hydrogen chloride can be suitably performed.

  Further, in the conventional filter 70 having no venturi portion 15, for example, as shown in FIG. 6, the filter boss 71 is short, and the metal venturi pipe 72 extends downward from the filter boss 71. For this reason, in the region A from the lower end of the venturi pipe 72 to the lower end of the filter boss 71, the effect of backwashing by the venturi pipe 72 cannot be obtained, and the adhered powder cannot be separated, Since it is sucked from the Venturi tube 72 to the clean chamber 4 side, one layer of powder adheres.

  On the other hand, in the filter 5 of this embodiment in which the venturi portion 15 is integrally formed with the filter boss 12, there is no region A where the powder remains adhered because the effect of backwashing cannot be obtained. do not do.

  In the filter 5 of the above embodiment, the filter 5 is mounted from below on the filter support member 10 welded to the filter mounting hole 2a of the partition wall 2, but as another embodiment of the present invention, the space of the clean chamber 4 is used. When a sufficient height can be secured, the filter may be directly inserted into the filter mounting hole 2a of the partition wall 2 from above.

  FIG. 7 is a partially longitudinal front view showing a structure when the filter 5 is mounted from above, and FIG. 8 is a plan view thereof.

  In the filter 5 of this embodiment, a flange 12a is provided at the upper end of the filter boss 12, and it can be directly inserted into the filter mounting hole 2a of the partition wall 2 from above. In this case, the flanges 12a of the group of filters 5 mounted in parallel are pressed and supported by a long fixing member 57 connected to the partition wall 2 by bolts 56, so that the flanges 12a of each filter 5 can be individually bolted or the like. Compared to the case of fixing to the partition wall 2, a large number of filters 5 can be easily fixed or released with a small number of members and a small number of operations.

  According to this embodiment, since the filter 5 is inserted into the filter mounting hole 2a of the partition wall 2 and mounted, the filter support member 10 required for each filter 5 becomes unnecessary, and the filter support member 10 is attached to the partition wall 2. There is no need for welding or screwing to the filter mounting hole 2a.

  Further, since the venturi portion 15 is integrally formed with the filter boss 12 of the filter 5, the venturi tube is inserted into the filter after the filter is mounted in the filter mounting hole 2a of the partition wall 2 as in the conventional example. Then, the work of fixing it becomes unnecessary.

  If the bolt insertion hole 58 of the fixing member 57 is a long hole, the bolt 56 is slightly loosened, and the fixing member 57 is moved along the long hole direction until it is disengaged from the flange 12a. Even if the 57 is not completely removed from the partition wall 2, the filter can be inserted into and removed from the filter mounting hole 2a, and the handleability in replacing the filter 5 is improved.

  Next, another embodiment of the present invention will be described.

The above-described embodiment, the dust-containing concentrations, for example, but was preferred for the environmental dust to the dust collecting fine dust of about less than 5 g / m ^3, the dust-containing concentration is 5 g / m ³ or more products catching An embodiment suitable for a dust collector for the purpose of collection will be described.

  In a dust collector for product collection, for example, a dust collector that separates and collects product powder conveyed by a carrier gas from the carrier gas, the concentration of the product powder contained in the gas is high. When the pleated filter 5 in which the filter medium 11 is formed into a cylindrical shape having a substantially star-shaped cross section is used, as shown in FIG. 9A, a valley between the ridges 11a and 11a bent in a pleat shape is used. Even if the product powder 65 is clogged in the portion and backwashed, the product powder 65 cannot be removed sufficiently.

  In this embodiment, in a pleated filter used in a dust collector for collecting products, the product powder is prevented from clogging in the valley between the ridges 11a and 11a.

  Specifically, as shown in FIG. 9B, the pleat angle θ of the filter medium 11 made of a nonwoven fabric bent in a pleat shape, that is, the adjacent ridges 11a and ridges 11a of the filter medium 11 bent in a substantially star shape in cross section. The angle θ of the valley between the two is set to a predetermined angle range.

  FIG. 10 is a diagram showing the results of a test conducted to obtain a preferable angle range of the pleat angle θ.

In this test, slaked lime having an average particle size of 4.3 μm (D ₅₀ = 4.3 μm) was used as the product powder, and the dust concentration, that is, the concentration of the product powder contained in the gas was set to 100 g / m ^3. It was. As shown in FIG. 9B, the filter used had an inner diameter D1 of 90 mm, an outer diameter D2 of 120 mm, and a length of 1000 mm. Moreover, the speed of the gas which passes the filter in a dust collector was 1.0 m / min.

  The horizontal axis in FIG. 10 indicates the operation time t (h), and the vertical axis indicates the filter differential pressure ΔP (kPa). The filter differential pressure ΔP was measured as the differential pressure between the collection chamber 3 and the clean chamber 4 as shown in the dust collector of FIG.

  The filter differential pressure ΔP is measured for each of the pleated type filters having the pleat angle θ of 11 °, 17 °, 22 °, and 33 °, and the angle θ is 180 °, that is, the pleated type is not used. The filter differential pressure ΔP was measured for the cylindrical filter. Note that the total surface area of this non-pleated filter is So, and, as will be described later, the total surface area S is a ratio with the total surface area S of each pleated filter having a pleat angle θ of 11 °, 17 °, 22 °, and 33 °. The surface area ratio S / So was calculated.

  As shown in FIG. 10, in the case of a pleated filter having a pleat angle θ of 11 °, the filter differential pressure ΔP increases rapidly immediately after the start of operation, and in the case of a pleated filter having a pleat angle θ of 17 °, It can be seen that the filter differential pressure ΔP rapidly increases around 2 hours after the start, and the filter is clogged.

Therefore, when the average particle size of the product powder is 4.3 μm (D ₅₀ = 4.3 μm) and the dust concentration is about 100 g / m ³ , the pleat angle θ of the filter 5 is larger than 17 °. It is preferable that it is 22 degrees or more.

  However, since the average particle diameter of the product powder to be collected is generally 10 μm or more, the pleat angle θ of the filter 5 may be 17 ° or more.

  FIG. 11 is a diagram showing the relationship between the pleat angle θ of each pleated filter having a pleat angle θ of 11 °, 17 °, 22 °, and 33 ° and the total surface area ratio S / So of the filter.

  As described above, the total surface area ratio S / So of the filter is that the pleat angle θ is 180 °, that is, the pleat angle θ is 11 when the total surface area of the filter that is not a pleat type and the filter medium 11 is simply cylindrical is So. It is a ratio with the total surface area S of each pleated filter of °, 17 °, 22 °, and 33 °.

  As shown in FIG. 11, the pleat angle θ is 180 °, that is, the pleat type filter having a pleat angle θ of 45 ° as compared with the total surface area So of the filter medium 11 which is not a pleat type and is simply cylindrical. It can be seen that the total surface area S is about 3 times and the total surface area S is about 7 times in a pleated filter having a pleat angle θ of 15 °.

  As described above, the pleat type filter having the pleat angles θ of 45 ° and 15 ° can increase the total surface area, and thus the filtration area, by about 3 times and about 7 times as compared with the non-pleated filter. For this reason, since the filter medium can be reduced in size, the volume of the entire dust collector can be reduced, and the cost can be reduced.

  Based on FIGS. 10 and 11, in order to reduce the size while suppressing clogging, the filter 5 of the present invention has a pleat angle θ of 15 ° to 45 °. The pleat angle θ is preferably not less than 15 ° and not more than 40 °, more preferably not less than 15 ° and not more than 35 °, and still more preferably not less than 20 ° and not more than 35 °. In the filter 5 of the type, the pleat angle is set to 22 °.

By prescribing the pleat angle of the pleated filter in this way, the concentration of the product powder contained in the gas is high, for example, it is suitably used for a dust collector intended to collect a product of 5 g / m ³ or more. be able to.

  12 to 14 show other embodiments of the tightening mechanism 20 and the lever lock mechanism 26 shown in FIGS.

  In the tightening mechanism 20 of this embodiment, an engagement hole 32 is formed on the other end side of the tightening band 18 and the engagement hole 32 is directly locked by the hook portion 25 of the hook lever 22. The buckle type tightening function and handling are the same as in the previous embodiment. According to this structure, the locking member 24 and its fulcrum bracket 23 in the previous embodiment are not necessary.

  In addition, the lock pin 30 of the lever lock mechanism 26 is formed in a substantially inverted U shape having a long one end side, and a holding hole 33 for inserting and holding the one end side of the lock pin 30 is formed in the fixed engagement portion 27 to lock the lock pin 30. The pin 30 is held so that it can move up and down and cannot be removed upward. This eliminates the need for the chain 31 to be secured to the lock pin 30 as in the above embodiment.

  The present invention can also be implemented in the following forms.

  (1) As shown in FIGS. 15 and 16, a lever lock mechanism 26 having a pin lock structure is mounted on the fulcrum bracket 21, and the lock pin 30 is inserted between the fulcrum bracket 21 and the hook lever 22. You can also

  (2) As shown in FIGS. 17 and 18, a rectangular loop-shaped lock arm 36 is pivotally connected to the outer surface of the other end of the fastening band 18 via a fulcrum bracket 35 so as to be rotatable around a fulcrum d. The hook lever 22 is rotated in the slack direction by locking the free end portion of the lock arm 36 from the outside to the notch 37 formed in the free end portion of the hook lever 22 rotated to the tightening position. A lever lock mechanism 26 for blocking can also be configured.

  (3) As shown in FIGS. 19 and 20, a rectangular loop-shaped lock arm 38 is pivotally connected to the free end of the hook lever 22 so as to be rotatable around a fulcrum e, and the hook lever 22 is moved to the tightening position. After the rotation, the lock arm 38 is rotated inward, and the free end portion of the lock arm 38 is moved over and locked to the locking claw 39 cut and raised from the fastening band 18. A lever lock mechanism 26 that prevents rotation in the slack direction can also be configured.

  (4) As shown in FIGS. 21 and 22, the tightening mechanism 20 may be configured such that a hook portion 25 is formed on the outer side of the hook lever 22.

  (5) As shown in FIG. 23, the lower ridge 51 is formed in an annular shape on the outer periphery of the filter boss 12 so as to be positioned below the clamping band 18 so that the ridge 51 is appropriate in the width direction of the clamping band 18. In addition to functioning as a positioning portion that determines a proper mounting position, it also functions as a stopper that prevents the fastening band 18 from moving downward due to vibrations after mounting.

  (6) As shown in FIG. 24, the engagement groove 52 is formed in an annular shape on the outer periphery of the filter boss 12, and the engagement protrusion is engaged with the engagement groove 52 at the center in the width direction of the tightening band 18. The strips 53 are formed continuously or intermittently at appropriate positions excluding the tightening points, and the engagement grooves 52 and the engagement protrusions 53 are engaged to position the tightening band 18 in the band width direction and to extend in the band width direction. It can also be configured to prevent shifting.

  (7) As a means for preventing the tightening band 18 from being positioned in the band width direction and moving in the band width direction, a shallow engagement groove having a width corresponding to the band width is formed in an annular shape on the outer periphery of the filter boss 12. Alternatively, it is also possible to use means such as engaging small protrusions protruding at a plurality of locations on the outer periphery of the filter boss 12 into circumferential elongated holes formed at a plurality of locations in the longitudinal direction of the fastening band 18.

  (8) As shown in FIG. 25, a screw groove 54 is formed on the outer periphery of the filter support member 10, and a screw protrusion (thread portion) 55 that engages with the screw groove 54 is formed on the inner periphery of the filter boss 12. The filter 5 can also be formed and screwed onto the filter support member 10. In this case, the screwed mounting state can be maintained by screwing the upper end of the filter boss 12 into a state where the upper end of the filter boss 12 is strongly pressed against the partition wall 2 and elastically deformed. In addition, it can also be carried out by forming a screw protrusion on the outer periphery of the filter support member 10 and a screw groove (thread portion) on the inner periphery of the filter boss 12.

  (9) As shown in FIGS. 26 and 27, the filter 5 is rotated about 90 degrees by making the thread groove 54 of the filter support member 10 and the thread protrusion 55 of the filter boss 12 into four threads, respectively. By simply doing so, it can be stably connected and fixed in a state where the screw is uniformly engaged over the entire circumference.

  When the filter 5 is screwed into the filter support member 10, it is desirable to provide means for preventing the filter 5 from loosening due to vibration or the like. For example, by providing the partition wall 2 (or the filter support member 10) with protrusions or pins that bite into and engage with the upper end (or inner periphery) of the filter boss 12 at a predetermined screwing position, screwing is prevented due to vibration or the like. The filter 5 can be removed by preventing it from sagging and turning it strongly in the opposite direction over the bite engagement.

  FIG. 28 shows some of the forms of inflow of the gas containing powder into the dust collector, and is selected according to the type of gas containing powder, and the like.

  When the powder contained in the gas is composed of coarse particles or sharply shaped particles, as shown in FIG. 28 (a), the gas containing the powder is allowed to flow under the filter group, thereby allowing the filter 5 to flow. It is possible to prevent the filter medium from being directly damaged by the powder collision.

  When the particle size of the powder contained in the gas is small, as shown in FIG. 28 (b), the gas containing the powder is caused to flow upward from the collection chamber, so that it is removed from the filter 5 and deposited in the lower part. It is possible to prevent the powder that has been swollen by the gas flow and re-adsorbed on the filter 5.

  As shown in FIG. 28 (c), when flowing in the tangential direction above the collection chamber, it is possible to suppress the rough particles in the gas from directly colliding with the filter 5, and the filter medium of the filter 5 is less likely to be damaged. Become. Further, the fine particles tend to aggregate while swirling and are easily collected by the filter 5.

  In the case where the particles of the powder contained in the gas are fine and do not fall when they rise, as shown in FIG. 28 (d), a collision plate 59 facing the inflow port 1a is provided, and the particles rise. Make it harder.

  In addition, as shown in FIG. 28 (e), when the inlet 1a is provided on the upper side and there is a possibility that the filter medium of the filter 5 may be damaged by collision with coarse particles, the gas containing the powder that has flowed in. May be guided downward by a U-shaped guide plate 60 in plan view.

2 Partition 2a Filter mounting hole 3 Collection chamber 4 Clean room 5 Filter 10 Filter support member 11 Filter medium 12 Filter boss 12a Flange 15 Venturi portion 16 Engagement portion (engagement groove)
17 Engagement part (engagement ridge)
18 Tightening band 22 Hook lever D Dead point θ Pleated angle

Claims (9)

A filter attached to a partition partitioning a collection chamber into which a gas containing powder flows and a clean chamber in which clean gas is collected;
A tubular filter boss molded with resin is connected to an end portion on the opening side of the bottomed cylindrical filter medium, and a venturi part for flowing backwashing gas is integrally formed inside the filter boss.
A filter characterized by that. The powder is a product powder, and the concentration of the product powder contained in the gas is 5 g / m ³ or more,
The filter medium is bent into a pleat shape, and the pleat angle is 15 ° or more and 45 ° or less.
The filter according to claim 1. The filter boss is made of an elastically deformable resin material and can be externally fitted to a filter support member attached to the partition wall, and an inner periphery of the filter boss has an outer periphery of the filter support member. An engagement portion that elastically engages with the provided engagement portion;
The filter according to claim 1 or 2. By tightening a tightening band attached to the outer periphery of the filter boss, the filter boss is prevented from being deformed outward, and the engagement state between the engagement portions is maintained.
The filter according to claim 3. The tightening band is provided with a hook lever for tightening, and can be switched between a tightening state and a tightening release state by forward and reverse rotation exceeding the dead point of the hook lever.
The filter according to claim 4. The filter boss includes a screw portion for screwing and mounting the filter support member attached to the partition wall,
The filter according to claim 3. The screw part is a multiple thread;
The filter according to claim 6. A mounting flange having a larger diameter than the filter mounting hole formed in the partition wall is provided in the filter boss, and the filter can be inserted into the filter mounting hole from the clean chamber side.
The filter according to claim 1 or 2. The collection chamber into which the gas containing the powder flows and the clean chamber in which the clean gas is collected are partitioned by a partition provided with a filter so that the gas in the collection chamber flows through the filter to the clean chamber. A dust collector equipped with in the clean room backwashing means for supplying backwashing gas toward the inside of the filter, comprising:
The filter is the filter according to any one of claims 1 to 8,
Dust collector characterized by that.

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