JP2013210147A - Air filter unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air filter unit capable of maintaining an airtight state of an upper space of an air filter in an air filter box relative to an indoor side of the air filter box, and being inexpensively manufactured by applying a simple structure.SOLUTION: An air filter unit has a flexible shaft 8 connected to an air volume adjustment damper 9 side of the air filter unit 100 at its upper end, an outer cylinder 11 mounted by being fitted into a through hole 10 of a filter frame 4 supporting an air filter, an operation shaft 13 rotatably disposed in the outer cylinder 11, and a shaft coupling 14 connecting an upper end of the operation shaft 13 and a lower end of the flexible shaft. A first seal material 12 is disposed between the outer cylinder 11 and the through hole 10 of the filter frame 4 to keep airtightness, a second seal material 21 is disposed between the flexible shaft 8 and an upper section of the outer cylinder 11 to keep an airtight state, and a plug 22 is demountably mounted on a lower section of the outer cylinder 11.

Description

  The present invention relates to an air filter unit that is provided, for example, on the ceiling of a clean room and includes an air volume adjusting mechanism.

  An air filter unit provided with an air volume adjusting mechanism is disclosed in Patent Document 1. 1 and 2 of Patent Document 1, this air filter unit has an air filter box, and the air filter is built in the air filter box. The air filter box is attached to a hole in the ceiling, and the air volume adjusting mechanism is provided so as to penetrate the wall portion of the air filter box. The operation shaft at the lower end of the air volume adjusting mechanism is connected to a damper in the duct via a flexible shaft. When the user adjusts the opening and closing amount of the damper by rotating the operation shaft at the lower end protruding to the room side of the air filter box, the air filter is supplied by the damper while air is supplied to the air filter from the duct on the ceiling. It is possible to adjust the amount of air supplied to the air, that is, the amount of air blown from the air filter to the clean room.

  The outer cylinder of the air volume adjusting mechanism passes through the through hole in the wall portion of the air filter box, and the space between the outer cylinder and the through hole of the air volume adjusting mechanism is hermetically sealed by a sealing material. An operation shaft is rotatably disposed in the outer cylinder, and the upper end portion of the operation shaft is connected to the lower end portion of the flexible shaft using a shaft coupling.

Japanese Utility Model Publication 2-45710

  However, in the air volume adjusting mechanism described above, when the user adjusts the opening / closing amount of the damper by rotating the operation shaft by a predetermined angle to adjust to the predetermined air volume, it is packed in the annular gap between the operation shaft and the outer cylinder. The sealed material is destroyed by the rotation of the operation shaft. For this reason, every time the user rotates the operation shaft by a predetermined angle and adjusts it to a predetermined air volume, the user packs the sealing material into the annular gap between the operation shaft and the outer tube, An operation for sealing the annular gap is required. For this reason, the operation | work which seals the clearance gap is very troublesome and troublesome. Moreover, since the air filter in the air filter box acts as an air resistor and the pressure in the upper space of the air filter (the upstream space of the air filter) is increased, the upper space of the air filter is the indoor side of the air filter box It is necessary to make the airtightness higher than (the downstream space of the air filter).

3 and 4 of Patent Document 1 are different from the conventional air volume adjusting mechanism shown in FIGS. 1 and 2 of Patent Document 1 in that a new sealing material is applied every time the user adjusts the air volume. The air volume adjustment mechanism which does not need to perform has been proposed. In this air volume adjusting mechanism, the link shaft passes through the wall portion of the air filter box, the power shaft is connected to the upper protruding portion of the link shaft, and the operation shaft is connected to the lower protruding portion of the link shaft. . A reel material is interposed between the link shaft and the cylindrical fixing fitting that fixes the link shaft. In addition, another sealing material is interposed between the tubular fixing bracket and the hole in the wall of the air filter box, and is further separated between the set ring that fixes the vertical movement of the link shaft and the lower surface of the box wall. The sealing material is interposed. However, the lower end portion of the operation shaft itself is not kept in an airtight state, and is left exposed to the indoor side of the air filter box in which the air filter is disposed (the space downstream of the air filter). The shaft itself is not sufficiently airtight. For this reason, the upper space of the air filter (the upstream space of the air filter) is insufficient to maintain sufficient airtightness with respect to the indoor side of the air filter box (the downstream space of the air filter). Moreover, the structure of the air volume adjusting mechanism has a problem that it is complicated and expensive.
Therefore, in order to solve the above problems, the present invention is such that the upper space of the air filter in the air filter box (the upstream space of the air filter) is compared with the indoor side of the air filter box (the downstream space of the air filter). It is an object of the present invention to provide an air filter unit that can be held in an airtight state and that can be made inexpensive by adopting a simple structure.

The air filter unit of the present invention is an air filter unit that includes an air filter and has an air filter box that is attached to a hole in the ceiling, and adjusts the amount of air supplied from the duct on the back of the ceiling to the air filter. The air volume adjusting mechanism includes an air volume adjusting damper that changes the amount of air by changing the angle, a flexible shaft having an upper end connected to the air volume adjusting damper, and the air filter. An outer cylinder fitted in a through hole of a filter frame supported in the air filter box, an operation shaft rotatably disposed in the outer cylinder, an upper end portion of the operation shaft, and a lower end of the flexible shaft A shaft coupling for connecting parts, and a gap is formed between the outer cylinder and the through hole of the filter frame. A first sealing material that is maintained in a state; a second sealing material that is maintained in an airtight state between the flexible shaft and the upper portion of the outer cylinder; and a lower portion of the outer cylinder that can be opened and closed And the operation shaft is sealed in an airtight state by the second seal member and the lid member in the outer cylinder.
According to the above configuration, the first seal member holds the space between the outer cylinder and the through hole of the filter frame. In addition, when the operating shaft is not used, the operating shaft for the user to rotate is covered with the outer cylinder and sealed in the outer cylinder with the second sealing material and the lid member. Thereby, the upper space of the air filter in the air filter box can be kept airtight with respect to the indoor side of the air filter box, and since a simple structure is adopted, the air volume adjustment mechanism can be made inexpensive, The cost of the air filter unit can be reduced.

Preferably, the lid member is held in an airtight state with respect to the outer cylinder via a third sealing material.
According to the above configuration, when the operation shaft is not used, the operation shaft in the outer cylinder can be maintained in a higher airtight state by using the lid member and the third seal material.

Preferably, the air volume adjusting damper is housed in the air filter box.
According to the said structure, the air volume adjustment damper is previously accommodated in the air filter box. For this reason, when the air filter unit is attached to the back of the ceiling, it is not necessary to separately provide the air volume adjusting damper between the air filter box and the duct. Therefore, even after the ceiling construction work for fixing the ceiling plate, the air filter unit can be attached to the back of the ceiling, and the air filter unit attachment work period can be selected flexibly.

  According to the present invention, there is provided an air filter unit in which the upper space of the air filter in the air filter box can be kept airtight with respect to the indoor side of the air filter box and can be made inexpensive by adopting a simple structure. be able to.

It is a perspective view which shows preferable embodiment of the air filter unit of this invention. It is a figure which shows a part of cross section in the AA of the air filter unit shown in FIG. It is a figure which shows a part of cross section in the BB line of the air filter unit shown in FIG. It is sectional drawing which shows the structural example of the mechanism main-body part of the air volume adjustment mechanism shown in FIG. FIG. 5A shows a through hole of the filter frame passing through the outer cylinder, and FIG. 5B is a diagram showing an example of the internal structure of the flexible shaft 8.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
The embodiments described below are preferred specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.
FIG. 1 is a perspective view showing a preferred embodiment of an air filter unit of the present invention. 2 is a diagram showing a part of a cross section taken along line AA of the air filter unit shown in FIG. 3 is a diagram showing a part of a cross section taken along line BB of the air filter unit shown in FIG.

An air filter unit 100 shown in FIG. 1 is provided, for example, in a ceiling back SS of a clean room, and is connected to an air supply duct 7 arranged in the ceiling back SS. The air filter unit 100 includes, for example, a rectangular parallelepiped air filter box 1, and an air filter 2 and a filter frame 4 are disposed in the air filter box 1. The filter frame 4 holds the air filter 2 in the air filter box 1. The filter frame 4 is a quadrangular frame body having a rectangular hole 4H at the center in order to arrange the air filter 2.
As shown in FIG. 2, the air filter unit 100 includes an air filter box 1, an air filter 2, an air volume adjusting mechanism 3 shown in FIG. 3, a filter frame 4, and a wind direction control plate 29.

  The air filter box 1 and the duct 7 shown in FIG. 2 are arranged in the ceiling back SS of the ceiling 5 of the clean room, and the flange 7F of the duct 7 is connected to the flange 1F at the top of the air filter box 1. The duct 7 supplies air to the upper space 1G of the air filter box 1 (the upstream space of the air filter 2). The filter frame 4 is a rectangular frame in which the air filter 2 is disposed below the upper space 1G of the air filter box 1. The wind direction control plate 29 is disposed on the room side (downstream space of the air filter 2) 1M, which is the downstream side of the air filter 2, and the wind direction control plate 29 has a plurality of air holes 29H. The wind direction control plate 29 is exposed from the square hole 6 formed in the ceiling 5 to the indoor side of the clean room.

  The air filter 2 shown in FIG. 2 is a high-performance filter for sterilization called, for example, a HEPA filter. For example, an embossed type filter, a non-separator type filter, or a separator type filter can be adopted. However, the type of the air filter 2 can be arbitrarily selected according to the application. The embossed type filter opens the space between the folded filter media by forming an emboss on the sheet-like filter media instead of using a separator. The non-separator type filter is fixed using a hot melt adhesive in a state in which the filter medium is bent. In the separator type filter, a plate-like separator is disposed between the folded filter media. As the filter medium, for example, a synthetic fiber material, a glass fiber material, or a film of PTFE (polytetrafluoroethylene) or the like sandwiched between nonwoven fabrics can be used.

The air volume adjusting mechanism 3 shown in FIGS. 2 and 3 has an air volume adjusting damper 9 shown in FIGS. 2 and 3, a flexible shaft 8 shown in FIG. 3, and a main body mechanism portion 20 shown in FIG. The air volume adjusting damper 9 shown in FIGS. 2 and 3 is held in the air filter box 1 in advance, and the air volume adjusting damper 9 is disposed at the entrance of the upper space 1G of the air filter box 1. As shown in FIG. 2, the air volume adjusting damper 9 faces the outlet 7 </ b> A of the duct 7.
2 has an operation shaft 9A, a damper shaft 9B, a damper blade 9C, and a gear box 9D. When the operation shaft 9A of the air volume adjusting damper 9 is rotated, the operation shaft 9A and the damper shaft 9B are interlocked via a gear in the gear box 9D, so that the damper blade 9C moves in the R direction around the damper shaft 9B. . By moving the damper blade 9C in the R direction, the amount of air taken into the upper space 1G of the air filter box 1 from the duct 7 and supplied to the air filter 2 can be adjusted. The air supplied to the air filter 2 is filtered by the air filter 2, and the air direction control plate 29 is supplied from the lower space 1M of the air filter box 1 to the room side of the clean room through the plurality of air holes 29H.

Here, with reference to FIG. 3 and FIG. 4, the mechanism main-body part 20 of the air volume adjustment mechanism 3 is demonstrated. FIG. 4 is a cross-sectional view showing a structural example of the mechanism main body 20 of the air volume adjusting mechanism 3 shown in FIG.
The air volume adjustment mechanism 3 shown in FIG. 3 is disposed in the upper space 1G in the air filter box 1 and is a device for a user to remotely adjust the damper blade 9C of the air volume adjustment damper 9 manually. As already described, as shown in FIG. 3, the air volume adjusting mechanism 3 includes an air volume adjusting damper 9 disposed above the upper space 1G of the air filter box 1, a flexible shaft 8 that can be bent freely, The mechanism main body 20 is disposed below the upper space 1G of the air filter box 1. As shown in FIG. 3, the flexible shaft 8 connects the operation shaft 9 </ b> A and the mechanism main body 20.
As shown in FIG. 4, the mechanism main body 20 includes an outer cylinder 11, a sealing material 12 as a first sealing material, a sealing material 21 as a second sealing material, a plug 22 as a lid member, and a third A sealing material 23 as a sealing material, a flexible shaft receiving member 24 receiving the lower end portion of the flexible shaft 8, and an operation shaft receiving member 25 receiving the operation shaft 28 are provided.

The outer cylinder 11 shown in FIG. 4 has a first cylinder part 11A and a second cylinder part 11B, and the outer diameter of the first cylinder part 11A is smaller than the outer diameter of the second cylinder part 11B. 11 A of 1st cylinder parts and the 2nd cylinder part 11B are cylinder members which have an opening part in both an upper end part and a lower end part.
The male screw 11M formed on the outer peripheral portion of the lower portion of the first cylindrical portion 11A is screwed into the female screw 11N formed on the inner peripheral portion of the upper portion of the second cylindrical portion 11B, whereby the first cylindrical portion 11A. And the second cylinder portion 11B are connected. The first cylinder portion 11A and the second cylinder portion 11B of the outer cylinder 11 hold the flexible shaft receiving member 24 and seal the flexible shaft receiving member 24 and the operation shaft 28 so that the outer cylinder 11 is outside. On the other hand, it is airtight (sealed).

  As shown in FIGS. 4 and 5A, a circular through hole 10 is formed in the filter frame 4 in advance. An upper outer peripheral portion 11C of the second cylinder portion 11B is fixed by being fitted into the through hole 10 of the filter frame 4. The filter frame 4 is fixed by welding to the wall portion 1W of the air filter box 1. Moreover, the sealing material 12 is disposed between the outer peripheral portion 11C at the top of the second cylinder portion 11B and the inner peripheral portion forming the through hole 10 of the filter frame 4. After the filter frame 4 is welded and fixed to the inner wall 1W of the air filter box 1, the sealing material 12 forms the outer peripheral portion 11C of the upper portion of the second cylinder portion 11B and the through hole 10 of the filter frame 4. Seal it so that air does not pass through it. Thereby, the upper space 1G of the air filter box 1 is airtight with respect to the lower space 1M of the air filter box 1.

4 is disposed between the upper end portion of the first cylinder portion 11A of the outer cylinder 11 and the outer peripheral surface of the receiving member 24 of the flexible shaft, and the outer cylinder 11 and the flexible shaft 8 It is sealed between. Thereby, the upper space 1G of the air filter box 1 is airtight with respect to the lower space 1M of the air filter box 1.
The plug 22 shown in FIG. 4 is a lid member that is detachably attached to the opening 11D in the lower portion of the second cylinder portion 11B of the outer cylinder 11. A male screw 22 </ b> A is formed on the outer periphery of the plug 22, and a female screw 11 </ b> E is formed on the inner surface of the lower portion of the second tube portion 11 </ b> B of the outer tube 11. The male screw 22A is engaged with the female screw 11E. The sealing material 23 is disposed on the male screw 22 </ b> A, and the sealing material 23 seals between the male screw 22 </ b> A of the plug 22 and the female screw 11 </ b> E of the second cylinder portion 11 </ b> B of the outer cylinder 11. By disposing the sealing material 23, the user can use the finger to plug the plug 22 while keeping the male screw 22A of the plug 22 and the female screw 11E of the second cylinder portion 11B of the outer cylinder 11 sealed. Can be gripped and rotated in the V direction. Thereby, the upper space 1G of the air filter box 1 is more airtight than the lower space 1M of the air filter box 1.

As shown in FIG. 4, the flexible tube 15 is a long member constituting the flexible shaft 8. The receiving member 24 of the flexible shaft receives and fixes the lower end portion 15F of the flexible tube 15. The lower end portion 15F of the flexible tube 15 is held by a presser fitting 8P, and the presser fixture 8P is fixed to the wall 1W of the air filter box 1 using a base 8R.
FIG. 5B shows an example of the internal structure of the flexible shaft 8 shown in FIG.
The flexible tube 15 has an outer shaft 15A and an inner shaft 15B. Inner shaft 15B is covered with outer shaft 15A. As shown in FIG. 3, the upper end portion 15G of the inner shaft of the flexible tube 15 is connected to the operation shaft 9A. The operation shaft 13 shown in FIG. 5B is a member for rotating the inner shaft 15 </ b> B of the flexible tube 15 of the flexible shaft 8. The shaft coupling 14 connects the lower end portion of the inner shaft 15 </ b> B of the flexible tube 15 and the upper end portion of the operation shaft 13. As a result, the inner shaft 15B of the flexible tube 15 connects the operation shaft 9A and the operation shaft 13 of the air volume adjusting damper 9 shown in FIG.

  The cylindrical flexible shaft receiving member 24 shown in FIG. 5B has a large-diameter portion 24A and a small-diameter portion 24B, and the small-diameter portion 24B fits into the upper portion of the cylindrical operation shaft receiving member 25. Yes. The bolt 26 fixes the small diameter portion 24 </ b> B of the flexible shaft receiving member 24 and the operation shaft receiving member 25. The cylindrical operation shaft receiving member 25 receives the operation shaft 13. That is, the operation shaft 13 is held in the operation shaft receiving member 25 so that it can be smoothly rotated by using a plurality of bearings 27. The rod 28 is a lower end portion of the operation shaft 13 and is a portion that is sandwiched between tools in order to rotate the operation shaft 13 using a tool such as a wrench.

Next, an example of an air seal structure in the air filter unit 100 including the air volume adjusting mechanism 3 described above will be described.
As shown in FIGS. 2 and 3, an air filter 2 is built in the air filter box 1. As shown in FIG. 3, the outer cylinder 11 of the air volume adjusting mechanism 3 is formed in the through hole 10 of the filter frame 4. It is provided by passing through. The air filter box 1 is mounted in a hole 6 provided in the ceiling 5 of the clean room. An air volume adjusting damper 9 of the air volume adjusting mechanism 3 is provided in the air filter box 1 in advance. For this reason, the air volume of the air volume adjusting mechanism 3 is provided between the duct 7 disposed on the back side of the ceiling 5 and the air filter 2 in the air filter box 1 only by disposing the air filter box 1 on the ceiling SS. An adjustment damper 9 can be arranged.
As shown in FIGS. 2 and 3, a U-shaped groove 2 </ b> B is provided in the upper part of the filter frame 2 </ b> A of the air filter 2. As shown in FIGS. 3 and 4, the U-shaped groove 2B is filled with silicon gel 2C. Therefore, the airtight state between the air filter 2 and the filter frame 4 is maintained by the flange 4A of the filter frame 4 hitting the silicon gel 2C in the U-shaped groove 2B.

As shown in FIGS. 5A and 4, the outer cylinder 11 of the air volume adjusting mechanism 3 passes through the through hole 10 of the filter frame 4. However, since the sealing material 12 is disposed between the outer cylinder 11 and the through hole 10 of the filter frame 4, air does not pass between the outer cylinder 11 and the through hole 10 of the filter frame 4. It is airtight. As shown in FIG. 5B, an operation shaft 13 is rotatably arranged in the outer cylinder 11, and an upper end portion of the operation shaft 13 and a lower end portion of a thinner shaft 15 B of the flexible tube 15 of the flexible shaft 8 are arranged. They are connected by a shaft coupling 14.
Further, as shown in FIG. 4, the sealing member 21 is airtight between the receiving member 24 of the flexible shaft and the upper portion of the first cylinder portion 11 </ b> A of the outer cylinder 11 so that air does not pass therethrough. A plug 22 is provided in the second cylinder portion 11 </ b> B of the outer cylinder 11 so as to be freely opened and closed via a seal material 23. The flexible shaft receiving member 24, the operating shaft 13, the shaft coupling 14, and the operating shaft receiving member 25 use the outer cylinder 11, the sealing material 12, the sealing material 21, and preferably the sealing material 23. It can be completely covered from 1M and kept airtight so that air does not leak.

Here, the material example of the sealing materials 12, 21, 23 and the silicon gel 2C shown in FIG. 4 will be described.
A caulking material can be used as the material of the sealing materials 12 and 21 shown in FIG. This caulking material can be a silicone-based material or a urethane-based material, but the urethane-based material takes a long time to cure, and there is a possibility that a caulking failure due to sagging may occur when caulking a vertical surface. Therefore, a silicone-based material is preferable. As the silicone material, deacetic acid type silicone and dealcohol type are desirable, but deacetic acid type is quick drying and high strength, but it emits acetic acid odor and also corrodes metal. Because of this, it is more preferable to use a dealcoholization type. Further, when used in a clean room, a low siloxane dealcohol type of which a low volatility siloxane is removed from a silicone caulking material is most desirable.
As the silicon gel 2C shown in FIG. 4, a jelly-like sealing material made of a viscoelastic body such as silicon gel having adhesive force and elasticity as disclosed in Japanese Patent Application Laid-Open No. 59-193112 is preferable.
As the sealing material 23 shown in FIG. 4, a sealing tape can be used. As this sealing tape, “tetrafluoroethylene resin unfired tape for sealing (raw tape)” (JIS
K 6885) can be used. The material of the seal tape is polytetrafluoroethylene. The sealing tape is a sealing material used to fill a gap generated in a connecting portion of a pipe for guiding liquid or gas in a water pipe or an air pipe. This seal tape retains airtightness by winding an appropriate amount around the male thread of the pipe to be connected and then engaging with the female thread.

Next, the air volume adjusting operation in the air filter unit 100 including the air volume adjusting mechanism 3 described above will be described.
When the air volume of the air supplied to the air filter 2 needs to be adjusted when the air filter unit 100 is used, the user rotates the left side by holding the plug 22 shown in FIG. 4 with a tool, for example. Thus, the plug 22 is removed from the lower portion of the second cylinder portion 11B of the outer cylinder 11. Thus, even if the plug 22 is removed from the lower part of the second cylinder part 11B of the outer cylinder 11, the sealing material 23 is not destroyed and can be used again. Thereby, the opening part 11D of the lower part of the second cylinder part 11B is opened. If necessary, the old sealing material 23 can be peeled off and a new sealing material 23 can be used.

Next, the user applies a tool such as a wrench to the rod 28 of the flexible shaft 8 from the opening 11D in the lower portion of the released second cylinder portion 11B shown in FIG. Turn the shaft 13. As the operation shaft 13 rotates, the inner shaft 15B of the flexible tube 15 connected through the shaft coupling 14 rotates in conjunction with the operation shaft 13. As the inner shaft 15B of the flexible tube 15 rotates, the operation shaft 9A of the air volume adjusting damper 9 shown in FIGS. 2 and 3 rotates. By rotating the operation shaft 9A, in the gear box 9D, the operation shaft 9A and the damper shaft 9B are interlocked via a gear, and the damper blade 9C shown in FIG. 2 can rotate in the R direction. Thereby, the air quantity taken into the air filter 2 side from the duct 7, ie, the air quantity supplied to the air filter 2, can be adjusted by selecting the angle of the damper blade 9C.
After adjusting the amount of air supplied from the duct 7 to the air filter 2 as described above, the user again holds the plug 22 shown in FIG. 11 can be attached to the opening 11D of the lower portion of the second cylinder portion 11B. Thereby, the inside of the outer cylinder 11 can be reliably kept in an airtight state again.

  As shown in FIG. 4, a male screw 22 </ b> A is formed on the outer peripheral portion of the plug 22, and a female screw 11 </ b> E is formed on the inner surface of the lower portion of the second tube portion 11 </ b> B of the outer tube 11. When the male screw 22A is engaged with the female screw 11E, the seal member 23 maintains a state in which the space between the male screw 22A of the plug 22 and the female screw 11E on the inner surface of the lower portion of the second cylinder portion 11B of the outer cylinder 11 is sealed. doing. For this reason, the seal material 23 is removed from the upper space 1G of the air filter box 1 in spite of adopting a structure in which the plug 22 can be removed from the opening 11D in the lower portion of the second cylinder portion 11B of the outer cylinder 11. Air can be reliably prevented from leaking into the lower space 1M of the air filter box 1 through the outer cylinder 11.

  In the air filter unit 100 according to the embodiment of the present invention, as shown in FIG. 4, the space between the outer cylinder 11 and the through hole 10 of the filter frame 4 is held in an airtight state by the first seal member 12. Moreover, the operation shaft 13 for the user to rotate is covered with the outer cylinder 11 when the operation shaft 13 is not used, and is airtight in the outer cylinder 11 by the second sealing material 21 and the plug 22 which is a lid member. Is sealed. Thereby, the upper space of the air filter 2 in the air filter box 1 can be kept airtight with respect to the indoor side 1M of the air filter box 1. In addition, since the main body mechanism portion 20 of the air volume adjusting mechanism 3 employs a simple structure, the air volume adjusting mechanism 3 can be made inexpensive, so that the cost of the air filter unit 100 can be reduced.

  In addition, as shown in FIG. 4, by placing a seal material 23, which is a third seal material, between the lower portion of the outer cylinder 11 and the plug 22, which is a lid member, the operation shaft 13 can When not used, the outer cylinder 11 can be kept in an airtight state by using the plug 22 as a lid member and the seal material 23 as a third seal material. As a result, the upper space 1G of the air filter box 1 shown in FIG. 4 can be more reliably maintained in an airtight state with respect to the lower space 1M side of the air filter box 1.

Conventionally, since an air flow adjustment damper was provided between the air filter unit and the duct, it was necessary to install an air flow adjustment damper between the air filter unit and the duct before the ceiling construction for fixing the ceiling plate. The work period for attaching the air filter unit to the back of the ceiling has been limited.
However, in the air filter unit 100 of the embodiment of the present invention, as shown in FIG. 2, the air volume adjusting mechanism 3 including the air volume adjusting damper 9 is stored in the air filter box 1 in advance. For this reason, it is not necessary to separately install the air volume adjusting damper between the air filter box and the duct. When a construction worker puts in the back of the ceiling, the air filter unit 100 of the embodiment of the present invention can be attached to the back of the ceiling even after the ceiling construction work for fixing the ceiling plate. 100 installation work periods can be selected flexibly.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the claims. For example, in the example shown in FIGS. 2 and 3, one rectangular damper blade 9C is attached to the damper shaft 9B, but not limited to this, a plurality of damper blades are attached to the damper shaft 9B. May be.
As shown in FIGS. 2 and 3, as a seal structure for preventing air from passing through the air filter 2, the U-shaped groove 2 </ b> B of the filter frame 2 </ b> A is filled with silicon gel 2 </ b> C, and the filter frame 4. The flange 4A contacts the silicon gel 2C in the U-shaped groove 2B, thereby ensuring an airtight state between the air filter 2 and the filter frame 4. However, the present invention is not limited to this, and the air filter 2 may be fixed by being bolted to the filter frame from below the filter frame via a gasket. Alternatively, the air filter 2 may be fixed by pressing the air filter with its own weight or bolt tightening from above the filter frame to the filter frame via a gasket.

If the flexible shaft 8 has the shaft coupling 14 for connecting the operation shaft 13 and the inner shaft 15B of the flexible tube 15, the positional relationship among the operation shaft 13, the inner shaft 15B, and the shaft coupling 14 is not particularly limited. The flexible shaft 8 is not limited to the structure having the outer shaft 1 and the inner shaft 15B shown in FIG. The shaft coupling 14 may be arranged independently in the upper part of the outer cylinder 11 instead of in the outer cylinder 11.
A part of each configuration of the above embodiment can be omitted, or can be arbitrarily combined so as to be different from the above.

DESCRIPTION OF SYMBOLS 1 ... Air filter box, 2 ... Air filter, 3 ... Air volume adjustment mechanism, 4 ... Filter frame, 5 ... Ceiling, 6 ... Ceiling hole, 7 ... Duct, DESCRIPTION OF SYMBOLS 8 ... Flexible shaft, 9 ... Air volume adjustment damper, 10 ... Through-hole of filter frame, 11 ... Outer cylinder, 12 ... Sealing material as 1st sealing material, 13 ... Operation Shaft, 14 ... shaft coupling, 15 ... flexible tube, 20 ... main body mechanism, 21 ... sealing material as second sealing material, 22 ... plug as lid member, 23 ... -Seal material as the third seal material, 24 ... flexible shaft receiving member, 25 ... operation shaft receiving member, 28 ... rod, 29 ... wind direction control plate,

Claims (3)

An air filter unit having an air filter box with a built-in air filter and attached to a hole in the ceiling,
An air volume adjustment mechanism for adjusting the amount of air supplied from the ceiling duct to the air filter;
The air volume adjusting mechanism is
An air volume adjusting damper that changes the amount of air by changing the angle;
A flexible shaft having an upper end connected to the air volume adjustment damper side;
An outer cylinder fitted in a through hole of a filter frame that supports the air filter in the air filter box;
An operation shaft rotatably disposed in the outer cylinder;
A shaft coupling that connects the upper end of the operation shaft and the lower end of the flexible shaft;
A first sealing material that holds an airtight state between the outer cylinder and the through hole of the filter frame;
A second sealing material for maintaining an airtight state between the flexible shaft and the upper part of the outer cylinder;
A lid member attached to the lower part of the outer cylinder so that the lower part of the outer cylinder can be opened and closed;
The air filter unit is characterized in that the operation shaft is sealed in an airtight state by the second seal member and the lid member in the outer cylinder.   2. The air filter unit according to claim 1, wherein the lid member is held in an airtight state with respect to the outer cylinder via a third sealing material.   The air filter unit according to claim 1, wherein the air volume adjusting damper is housed in the air filter box.

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