JP2014140821A - Replaceable air filter unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a replaceable air filter unit in which a filter can be safely and quickly replaced, as the replaceable air filter unit.SOLUTION: The replaceable air filter unit includes a filter provided in an inside space of a filter casing, and an opening provided in the filter casing. The replaceable air filter unit further includes in two inner wall surfaces of the filter casing, support frames for supporting the filter and at least two filter attaching implements for supporting-fixing the filter by abutting on filter mounting surfaces provided in the inner wall surfaces of the filter casing. The filter attaching implement includes a clamp part having a gripping lever and a presser support bar for advancing or retreating in conjunction with rising-up/falling-down of the gripping lever. When replacing the filter with a new filter, the gripping lever is raised up and fallen down, and the presser support bar is advanced or retreated.

Description

  The present invention relates to a replaceable air filter unit.

  Conventionally, in facilities such as hospitals and pharmaceutical factories, an air filter unit that removes harmful dust contained in gas to be exhausted in the facility is used. This air filter unit is a hermetically replaceable air filter unit that allows an operator to safely replace and replace a used air filter by sealing the air filter containing harmful substances in a plastic bag. ing.

In the sealed exchange type air filter unit, the filter support frame does not have to be fixed in the filter chamber (filter casing), and there is no need to attach an auxiliary metal fitting to the lower surface of the filter, and the upper surface of the filter is pressed against the ceiling surface of the filter chamber. A known filter mounting mechanism is known (Patent Document 1).
The filter mounting mechanism includes a filter support guide mechanism that holds the filter in and out of the filter chamber. This filter support guide mechanism has two front and rear members attached to the bottom surface thereof so that a spring is sandwiched between two U-shaped members that are long in the left-right direction with respect to the filter insertion direction. A rotating shaft is provided horizontally on the inner bottom surface of the filter chamber so that the filter is raised together with the filter support guide mechanism and the upper surface of the filter is pressed against the filter mounting surface provided on the ceiling surface of the filter chamber. A driven shaft connected to the rotating shaft so as to rotate in the reverse direction via a connecting rod is provided. Two eccentric cams are attached to each of the rotating shaft and the driven shaft, and the filter support guide mechanism is placed so that the bottom surface of the U-shaped member comes into contact with the cam surface of the eccentric cam.

In addition, there is also known a filter replacement method that enables safe filter replacement in a hermetically replaceable air filter (Patent Document 2).
Specifically, first, the opening and closing lid of the casing of the sealed exchange type filter unit is opened, the bag stored in the storage chamber is pulled out, and the used filter is stored in the bag without directly touching the filter. . Next, after heat-sealing the bag at a portion between the lip of the bag and the stored filter, the bag is cut at the heat-sealing portion, and the used filter-containing bag is removed. After that, the mouth of the bag prepared with a new filter inside is detachably attached to the outer periphery of the exchange port, and the old bag remaining remaining on the mouth after being heat-sealed is removed from the mouth and renewed. The bag is put in a space area of the bag, and the bag is heat-sealed between the internal filter and the bag remaining portion. Thereafter, the heat seal part is cut to separate and remove the space, and the filter together with the bag is pushed into a predetermined position in the casing, the bag is folded and stored in the storage chamber, and the opening / closing lid is opened. close up.

Japanese Patent No. 3793581 Japanese Patent Publication No. 63-66574

  However, since the known filter mounting mechanism described above includes the filter support guide mechanism, the structure becomes complicated, the number of members used increases, the weight increases, and the installation work is adversely affected. In addition, since the rotation shaft extends outside from the wall surface of the filter chamber, in order to prevent harmful dust leakage from the gap around the rotation shaft, the work of caulking sealing increases, the filter chamber wall The problem is that the configuration is complicated. Furthermore, if the sealing process is insufficient, harmful dust may leak.

  Further, in the filter replacement method in the above-described hermetic exchange type air filter, a replacement bag is attached to a port of an exchange port for exchanging the filter, and a door that contacts the port and isolates the internal space of the filter chamber. Is provided in the filter chamber. Therefore, the prevention of dust leakage is limited to the contact of the door with the port. Only this leakage prevention may not sufficiently prevent harmful dust collected by the filter from leaking outside.

It is also conceivable to use a screw-type jack for moving the filter in the inner space of the filter chamber so that the filter comes into contact with the filter mounting surface. However, when a screw-type jack is used, the screw-type jack needs to be rotated many times in order to move the filter upward and support the screw-type jack. In particular, when the bag is used to safely replace the filter, the rotation operation must be performed through the bag, and the bag may be twisted by a frequent rotation operation to open a hole in the bag. On the other hand, when the rotating shaft of the screw jack is extended to the outside of the filter chamber, the clearance of the filter chamber around the rotating shaft is subjected to caulking sealing treatment, but sufficient sealing cannot be performed and harmful from a slight clearance. There is a risk that the dust will easily leak out.
Also, when two screw jacks are provided on both sides of the filter, the upper surface of the filter is brought into close contact with the filter mounting surface while maintaining the orientation of the upper surface of the filter constant. It ’s difficult. The reason is that insufficient screw winding may cause harmful dust leakage due to insufficient sealing of the upper surface of the filter, while excessive screw winding may damage the filter. Moreover, if a screw-type jack is used, a filter mounting mechanism will become large and weight will also become heavy.
For this reason, in a hermetically replaceable air filter unit, it is required to replace the filter more safely and quickly than in the past.

  Accordingly, the present invention provides a replaceable air filter unit that can safely and quickly replace a filter in a replaceable air filter unit, and in particular, a replaceable air filter unit that can be reduced in weight and has a compact device configuration. The purpose is to do.

One embodiment of the present invention is a replaceable air filter unit. The unit is
A filter casing;
A filter provided in the internal space of the filter casing;
An opening provided in the filter casing from which the filter can be removed from the filter casing;
On the two inner wall surfaces of the filter casing, a support frame that supports the filter,
And at least two filter removal jigs attached to the inner wall surface of the filter casing, wherein the filter is supported and fixed in contact with a filter mounting surface provided on the inner wall surface of the filter casing.
The filter fixture includes a clamp portion including a gripping lever and a pressing support bar that moves forward or backward in conjunction with the raising and lowering of the gripping lever. When the filter is replaced with a new filter, the new filter is further brought into contact with the filter mounting surface from the position of the opening in order to move the filter in contact with the filter mounting surface to the position of the opening. For this purpose, the holding lever is moved up and down to move the holding support bar forward or backward.

  The filter fixtures are attached to inner wall surfaces on both sides of the inner wall surface having the opening of the filter casing, and each of the filter fixtures has a guide rod that penetrates a through hole provided in the support frame. It is preferable that at least two are provided on both sides of the clamp part.

  The filter casing is further erected from the outer wall surface of the filter casing so as to cover the outer periphery of the periphery of the opening, and has a plate-like standing member having a surface bent in the outer direction of the periphery of the opening; A fixed surface that is fixed to the surface of the standing member in a plane, and an opening lid that closes the opening by fixing the surface of the standing member and the fixed surface; preferable.

  It is preferable that a gasket having a circular cross section is provided on the surface of the filter that comes into contact with the filter mounting surface.

As the particle removal filter, a prefilter, a medium performance filter, and a high performance filter (quasi-HEPA filter, HEPA filter, ULPA filter, ultra-ULPA filter) can be used as the filter. Furthermore, as the gas removal filter, an acid gas removal filter, an alkaline gas removal filter, and an organic gas removal filter can be used for the filter.
In particular, when used in facilities such as hospitals and pharmaceutical factories, the filter is provided on the upstream side in the gas flow direction from the HEPA filter and the HEPA filter, and collects some of the particles in the gas. It is preferable to have a prefilter.

  According to the exchange type air filter unit described above, the filter can be exchanged safely and quickly. Furthermore, the weight can be reduced and a compact device configuration can be obtained.

(A), (b) is the front view and sectional drawing of a hermetic exchange type air filter unit of this embodiment. (A) is a figure explaining the clamp part of an example used for this embodiment, (b) is a diagram explaining the mechanism of a clamp part, (c) is a guide rod used for this embodiment It is a figure explaining an example, (d) is a figure explaining the gasket used for this embodiment. It is a figure which shows the structure of the filter used for this embodiment. It is a figure explaining the structure around the opening of this embodiment. It is a figure explaining the other example of the guide rod used for this embodiment. It is a figure explaining the 1st step of replacement | exchange of the air filter in the hermetic exchange type air filter unit of this embodiment. It is a figure explaining the 2nd step of exchange of the air filter in the hermetic exchange type air filter unit of this embodiment. It is a figure explaining the 3rd step of exchange of an air filter in a sealed exchange type air filter unit of this embodiment. It is a figure explaining the 4th step of replacement | exchange of the air filter in the airtight replacement type | formula air filter unit of this embodiment. It is a figure explaining the 5th step of replacement | exchange of the air filter in the airtight replacement type | formula air filter unit of this embodiment. It is a figure explaining the 6th step of replacement | exchange of the air filter in the airtight replacement | exchange type air filter unit of this embodiment. It is a figure explaining the 7th step of replacement | exchange of the air filter in the airtight replacement | exchange type air filter unit of this embodiment. It is a figure explaining the 8th step of replacement | exchange of the air filter in the airtight replacement type air filter unit of this embodiment.

  Hereinafter, the exchangeable air filter unit of the present invention will be described in detail.

(Replaceable air filter unit)
FIG. 1A and FIG. 1B are a front view and a cross-sectional view of a hermetically replaceable air filter unit (hereinafter simply referred to as a unit) 1 of the present embodiment. FIG.1 (b) is sectional drawing cut | disconnected along the XX 'line in Fig.1 (a).
The unit 1 includes a filter casing 2, a filter 3, a support frame 4, and a filter removing jig 5. Further, the wall surface of the filter casing 2 is provided with an opening 2a. In the unit 1, the filter 3 is provided in the filter casing 2, and a storage space for storing the plastic bag by folding it outside the filter 3 is provided. An opening 2a and an opening lid are provided outside the storage space. At the periphery of the opening 2a, the rim of the plastic bag is attached in an airtight and detachable manner, and the plastic bag is folded and stored in the storage space.

A filter casing (hereinafter simply referred to as a casing) 2 forms a box shape by combining stainless steel plates, and introduces gas to be exhausted (introduced from above the unit 1 in FIGS. 1A and 1B). Then, dust or the like in the gas is removed by the filter 3 and discharged to the outside (discharged from the side of the unit 1 in FIGS. 1A and 1B).
The filter 3 is provided in the internal space of the casing 2. The filter 3 is, for example, a HEPA filter (air filter having a particle collection rate of 99.97% or more for particles having a particle diameter of 0.3 μm and an initial pressure loss of 245 Pa or less). It is preferable to provide a prefilter that collects some of the particles in the gas because the particle collection rate is inferior to that of the HEPA filter. The HEPA filter and the prefilter are housed in a filter frame (not shown). The filter frame is provided with a pre-filter on the upstream side of the gas flow with respect to the HEPA filter.

  The opening 2 a is provided on the front wall surface of the casing 2. The opening 2a is closed by an opening lid 8 (see FIG. 1B). In FIG. 1A, the opening lid 8 that covers the opening 2 a is not shown to show the details of the inside of the casing 2. The opening 2 a has such a size that the filter 3 can be taken out from the casing 2.

The support frame 4 is a member on which the filter 3 is mounted and supported from the bottom surface of the filter 3. The support frame 4 is provided on the two inner wall surfaces of the casing 2. Specifically, assuming that the open wall surface of the opening 2a is the front surface, the support frames 4 are provided on the side wall surfaces on both sides as viewed from the front surface. More specifically, the support frame 3 is supported from below by a pressing support bar of the filter fixture 5 described later. The filter attachment 5 is fixed to the side surface through the plate material 7. Therefore, the support frame 4 is moved up and down in the figure by the advancement or retreat of the holding support bar provided in the filter fixture 5.
The filter attachment 5 includes a clamp portion 10 and a guide rod 12. The clamp unit 10 will be described later.

  Two guide rods 12 are attached to the wall surfaces on both sides of the filter fixture 5 (inner wall surfaces on both sides of the inner wall surface having the opening 2 a), and are fixed to a plate 7 fixed to the side surface of the casing 2. When the support frame 4 is raised and lowered, since the support surface of the filter fixture 5 that supports the support frame 4 from below is small, the guide bar 12 is provided with the filter 3 so that the arrangement of the support frame 4 can be maintained horizontal. To move up and down horizontally.

The clamp portion 10 of the filter attachment 5 includes a gripping lever 10a and a pressing support bar 10b that moves forward or backward in conjunction with the raising and lowering of the gripping lever 10a. FIG. 2A is a diagram illustrating an example of the clamp unit 10 used in the present embodiment, and FIG. 2B is a diagram illustrating a mechanism of the clamp unit 10.
As shown in FIG. 2A, when the gripping lever 10a is tilted in the direction of the arrow (falling from the dotted line to the solid line), the pressing support bar 10b moves forward. For this reason, the support frame 4 on which the filter 3 is placed can be moved upward. As can be seen from the diagram shown in FIG. 2B, when the grip lever 10a is tilted, the grip lever 10a rotates about the support shaft 10c. At this time, the moving shaft 10d located in the lateral direction in the middle of the gripping lever 10a moves to the right in the figure by tilting the gripping lever 10a. By the movement of the moving shaft 10d, the angle formed by the first cam 10e and the second cam 10f supported on the same shaft as the moving shaft 10d is increased. One end of the first cam 10e is a moving shaft 10g, and one end of the second cam 10f is a support shaft 10h. As a result, the first cam 10e and the second cam 10f spread in a straight line, so that the pressing support bar 10b positioned above the moving shaft 10g is advanced upward.

Similarly, when the grip lever 10a is raised in the direction opposite to the arrow from the position of the solid line in FIG. 2A, each part and each axis move and rotate in the direction opposite to the arrow shown in FIG. As a result, the holding support bar 10b positioned above the moving shaft 10g is retracted downward.
The amount of forward or backward movement of the pressing support rod 10b of the clamp unit 10 is determined by the dimensions of each part of the clamp unit 10. Therefore, the filter fixture 5 according to the present embodiment is positioned at a position in the height direction of the casing 2 so that the filter 3 comes into contact with the filter mounting surface 14 when the presser support rod 10b is most advanced. It is attached. An example of such a clamp portion 10 is a lateral push type toggle clamp KC-51B-M (in 5 / B) manufactured by Kakuda Kogyo Co., Ltd. The mechanism of the clamp part 10 is not limited to a mechanism as shown in FIG. It may be a mechanism in which the holding support bar 10b moves forward by pulling up the grip lever 10a from the collapsed state.

  Therefore, when the filter 3 is replaced with a new filter, in order to move the filter 3 in contact with the filter mounting surface 14 to the position of the opening 2a, the new filter is further brought into contact with the filter mounting surface 14 from the position of the opening 2a. In order to achieve this, the holding lever 10a is raised and lowered to move the holding support bar 10b forward or backward.

FIG. 2C is a view for explaining the guide rod 12. As shown in FIG. 1B, two guide rods 12 are provided on both sides with the clamp portion 10 interposed therebetween. Each of the two guide rods 12 penetrates the support frame 4 on which the filter 3 is placed. For this reason, the support frame 4 moves up and down along the guide rod 12. Since the guide rods 12 are provided on both sides with the clamp portion 10 in between, the support frame 4 can be kept horizontal when the support frame 4 is raised and lowered.

  FIG. 2D is a view for explaining a gasket used in the present embodiment. The gasket 16 is a member that blocks the flow of gas between the frame 3a that houses the filter and the ceiling member 18 that constitutes the filter mounting surface 14, and is made of a chloroprene rubber material. As shown in FIG. 2 (d), the gasket 16 is preferably a gasket having a circular cross section, that is, a kamaboko-shaped gasket. By using the gasket 16 having a circular cross section, the pressure-bonding area with the filter mounting surface 14 is smaller than that of a conventionally used flat gasket. For this reason, it is possible to prevent the gasket residue from sticking to the ceiling member 18, which has been a problem due to the large crimping area. If this sticking remains, it leads to gas leakage and the function as a filter is lowered, which is not preferable. Also, it takes time and effort to remove the sticking. By using the gasket 16 having a circular cross section, even if the gasket 14 is pressure-bonded to the filter mounting surface 14, the pressure-bonding area is not large, so that a residue hardly remains on the filter mounting surface 14.

  FIG. 3 is a diagram illustrating a configuration of a filter used in the present embodiment. As shown in FIG. 3, the filter 3 includes a HEPA filter 3 b and a prefilter 3 c that is provided upstream of the HEPA filter 3 b in the gas flow direction and collects a part of particles in the gas. It is preferable. Conventionally, the prefilter and the HEPA filter are provided in separate units and are exchanged separately. However, such an apparatus has a large casing. From this point, it is preferable that the HEPA filter 3 b and the pre-filter 3 c are accommodated in the same filter 3. An interval is provided between the pre-filter 3c and the HEPA filter 3b, but this is not essential. The prefilter and the HEPA filter used are not particularly limited, and known ones are used. For example, a mat-like material obtained by curling long glass fibers is used for the pre-filter 3c, and a separator-type HEPA filter in which glass fiber paper is pleated and spaced by a separator is used for the HEPA filter 3b.

  FIG. 4 is a diagram illustrating a configuration around the opening according to the present embodiment. The opening 2 a is formed by a tubular opening port 20 erected from the casing 2. Elastic O-rings 2 c, 2 d, 2 e are arranged on the outer peripheral side wall of the opening port 20 so as to sandwich the vinyl bag 24 between the outer peripheral side wall of the opening port 20. The elastic O-ring 2 e is provided at the end of the plastic bag 24 and is integrated with the plastic bag 24. The plastic bag 24 is folded and stored in the storage space S (see FIG. 1B) shown in FIG. The vinyl bag 24 is used to replace the filter 3 in a sealed state without directly touching the filter 3 when the filter 3 is replaced with a new filter as will be described later. The vinyl bag 24 is not limited as long as it is made of a known material and manufacturing method.

  Further, the casing 2 is further erected from the outer wall surface of the casing 2 so as to cover the outer periphery of the periphery of the opening 2a, and has a plate-like erection having a surface 26 bent in an angle shape toward the outer side of the periphery of the opening 2a. A member 28 is provided. Further, the casing 2 includes an opening lid 8 having a fixed surface 30 bent in an angle shape and fixed to the surface 26 of the standing member 28. The surface 26 and the fixed surface 30 of the standing member 28 are fixed in a planar shape via a member 32. The surface 26 and the fixing surface 30 of the standing member 28 are fixed in a planar shape via a member 32 using bolts 31a and nuts 31b. Such fixing is performed at a plurality of places, for example, 16 places outside the periphery of the opening 2a. Therefore, the opening 2 a is covered with the plastic bag 24 and isolated from the internal space of the casing 2, and the opening 2 a is isolated from the external space by the opening lid 8. Therefore, the internal space of the casing 2 is isolated twice. The double isolation structure as described above is that when the opening 2a is directly closed by the opening lid 8 and the internal space of the casing 2 is isolated, the plastic bag 24 is damaged by the contact between the tip of the opening 2a and the opening lid 8. In addition to being easy, the contact portion between the opening 2a and the opening lid 8 becomes a thin region at the tip of the opening 2a, and harmful dust is likely to leak from the internal space of the casing 2. Moreover, when the lip of the vinyl bag 24 is located in the external space, it is easily deteriorated by receiving ultraviolet rays. Therefore, as in the present embodiment, the surface 26 and the contact surface 30 of the standing member 28 are fixed in a planar shape using the bolt 30 and the nut 31, and the structure of the opening 2a is double separated. As described above, it is preferable to enhance the prevention of harmful dust leakage and protect the plastic bag 24 from ultraviolet rays.

The casing 2 of the present embodiment is configured by combining plate materials such as stainless steel plates. When fixing plate materials, from the viewpoint of reliability in preventing leakage, the plate materials are all welded, but spot welding can also be performed. In that case, the portions other than spot welding may be sealed with a caulking material. By performing spot welding in this way, the weight of the casing 2 can be reduced.
As shown in FIG. 2 (c), the guide rod 12 in the present embodiment is a rod that penetrates a through hole provided in the support frame 4. However, the guide rod 12 is a hollow fixed to the support frame 4 as shown in FIG. It may be a rod that penetrates the pipe 34.

(Filter replacement method)
Since the filter 3 collects harmful dust and the like, the operator needs to perform replacement work with the filter 3 sealed. Hereinafter, a method of replacing the filter while maintaining the sealed state of the filter 3 will be described.

  First, as shown in FIG. 6A, the opening lid 8 is opened, and as shown in FIG. 6B, the plastic bag 24 folded in the storage space in the casing 2 is pulled out and opened. The filter 3 is removed, and the filter 3 is taken into the plastic bag 24 without directly touching the filter 3. When removing the filter 3, the filter 3 is lowered to the position of the opening 2 a by causing the gripping lever 10 a of the clamp portion 10 of the filter attachment 5, and the lowered filter 3 is lowered from the support frame 4 and placed in the vinyl bag 24. Into. The work of lowering the filter 3 from the support frame 4 caused by the grip lever 10 a is performed manually by the operator from the outside of the plastic bag 24.

  Next, as shown in FIG. 6C, the plastic bag 24 is heat-sealed at a portion 24b between the front edge 24a of the plastic bag 24 and the frame 3 accommodated therein. Thereafter, as shown in FIG. 6D, the plastic bag 24 is cut at the heat-sealed portion 24b. Thereby, the used filter 3 which sealed the filter 3 is removed. At this time, since the opening of the remaining portion 24c of the beer bag 24 left on the casing 2 side is closed by heat sealing, the internal space of the casing 2 is kept closed. Accordingly, even in this case, toxic fine particles remaining in the internal space of the casing 2 do not leak to the outside.

Next, as shown in FIG. 6E, a plastic bag 24 ′ containing a new filter 3 ′ at the bottom is prepared. As shown in FIG. 6F, the rim 24a ′ of the plastic bag 24 ′ covers the remaining portion 24c. In addition, a plastic bag 24 ′ having an O-ring 2 e ′ at the end is overlapped on the remaining portion 24 c and covered on the periphery of the opening 2 a.
At this time, as shown in FIG. 6F, while removing the remaining portion 24c from the elastic O-rings 2c and 2d provided in the opening 2a and holding the remaining portion 24c, a new O-ring 2e ′ is provided at the end. The edge 24a 'of the plastic bag 24' is sandwiched between the elastic O-rings 2c and 2d. In this manner, the opening 2a can be attached to the vinyl bag 24 'with the internal space of the casing 2 closed. The removal of the remaining portion 24c from the opening 2a and the mounting of the plastic bag 24 'are performed manually by the operator.

  Thereafter, as shown in FIG. 6G, the remaining portion 24c removed from the opening 2a is taken into a pocket portion 24b ′ provided at the bottom of the plastic bag 24 ′, and a connecting portion between the pocket portion 24b ′ and the plastic bag 24 ′ is formed. After heat sealing, this part is cut. As a result, the remaining portion 24c is removed from the plastic bag 24 'while being accommodated in the pocket portion 24b' and sealed. Since the connecting portion between the plastic bag 24 'and the pocket portion 24b' is heat-sealed and this connecting portion is cut, the remaining body of the plastic bag 24 'has no holes. In this state, as shown in FIG. 6H, the filter 3 ′ in the plastic bag 24 ′ is placed on the support frame 4 in the casing 2 from the outside of the plastic bag 24 ′. The support frame 4 on which the filter 3 ′ is placed is raised by tilting the grip lever 10 a of the clamp portion 10 of the filter attachment 5, and the filter 3 ′ is brought into contact with the filter mounting surface 14 and fixed. Thereafter, the plastic bag 24 ′ is folded and stored in the storage space. Finally, the opening lid 8 is closed.

  As described above, even when the filter is replaced, the filter can be replaced while the internal space of the casing 2 is blocked from the outside using the vinyl bag 24 and the plastic bag 24 '. Therefore, the filter 3 can be replaced safely. At this time, when the filter 3 is mounted in contact with the filter mounting surface 14, the operator mounts it through the vinyl bags 24, 24 ′. Therefore, it is preferable that the operator's manual work is simple. In the conventional operation of rotating the rotation shaft or the rotation operation using a jack, the plastic bags 24, 24 'are easily damaged. For this reason, when the filter is mounted, it is effective to be a simple operation of raising and lowering like the grip lever 10a. Therefore, the filter 3 can be replaced quickly.

  The filter attachment 5 of the present embodiment is attached to the inner wall surfaces on both sides of the inner wall surface having the opening 2 a of the casing 2, and each of the filter attachments 5 passes through a through hole provided in the support frame 4. Since at least two guide rods 12 are provided on both sides of the clamp portion 10, the support frame 4 can always be kept horizontal, and the filter 3 can be mounted on the casing 2 without being inclined on the filter mounting surface 14. Can do.

  Further, in the casing 2 of the present embodiment, a plate-like standing member 28 that is provided upright from the outer wall surface of the casing 2 so as to cover the outer periphery of the opening 2a and has a surface bent in the outer direction of the outer periphery of the opening 2a. And an angled fixed surface 30 that is fixed to the surface 26 of the standing member 28, and the opening 2 a is closed by fixing the surface 26 and the fixing surface 30 of the standing member 28. An open lid 8 is provided on the casing. That is, the opening 2a has a double isolation structure. For this reason, compared with the case where the opening 2a is directly closed by the opening lid 8 to isolate the internal space of the casing 2, damage to the vinyl bag 24 can be suppressed by the contact between the tip of the opening 2a and the opening lid 8. Further, harmful dust is prevented from leaking from the internal space of the casing 2. Moreover, since the lip of the vinyl bag 24 is not exposed to the external space, deterioration due to ultraviolet rays is prevented.

  In the present embodiment, a gasket 16 having a circular cross section is provided on the surface of the filter 3 that contacts the filter mounting surface 14. For this reason, the residue of the gasket 16 is difficult to adhere to the filter mounting surface 14, and gas leakage due to the adhesion of the residue can be suppressed.

  The filter 3 to be replaced includes a HEPA filter and a prefilter that is provided upstream of the HEPA filter in the gas flow direction and collects a part of particles in the gas. For this reason, compared with the case where the HEPA filter and the pre-filter are arrange | positioned in a separate casing like the past, the unit 1 can be reduced in size and also a weight can be reduced. That is, the unit 1 has a compact device configuration that can be reduced in weight.

  Although the replaceable air filter unit of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment, and various improvements and modifications may be made without departing from the gist of the present invention. Of course.

1 Unit 2 Filter casing 2a Opening 2b Member 2c, 2d, 2e Elastic O-ring 3, 3 'Filter 3a Frame 3b HEPA filter 3c Prefilter 4 Support frame 5 Filter removal jig 8 Opening lid 10 Clamping part 10a Holding lever 10b Pressing Support rods 10c, 10h Support shafts 10d, 10g Moving shaft 10e First cam 10f Second cam 12 Guide rod 14 Filter mounting surface 16 Gasket 18 Ceiling member 20 Open ports 24, 24 'Plastic bags 24a, 24a' Edge 24b Portion 24c Remaining portion 24b 'Pocket portion 26 Surface 28 Standing member 30 Fixed surface 31a Bolt 31b Nut 32 Member 34 Hollow pipe

Claims (5)

A replaceable air filter unit,
A filter casing;
A filter provided in the internal space of the filter casing;
An opening provided in the filter casing from which the filter can be removed from the filter casing;
On the two inner wall surfaces of the filter casing, a support frame that supports the filter,
Comprising at least two filter removal jigs attached to the inner wall surface of the filter casing, wherein the filter is supported and fixed in contact with a filter mounting surface provided on the inner wall surface of the filter casing;
The filter attachment has a clamp portion including a gripping lever and a pressing support bar that moves forward or backward in conjunction with the raising and lowering of the gripping lever,
When the filter is replaced with a new filter, the new filter is further brought into contact with the filter mounting surface from the position of the opening in order to move the filter in contact with the filter mounting surface to the position of the opening. For this purpose, an exchangeable air filter unit characterized in that the holding lever is moved up and down to move the holding support bar forward or backward. The filter fixture is attached to inner wall surfaces on both sides of the inner wall surface having the opening of the filter casing,
2. The replaceable air filter unit according to claim 1, wherein each of the filter fixtures includes at least two guide rods penetrating through a through hole provided in the support frame on both sides of the clamp portion.   The filter casing is further erected from the outer wall surface of the filter casing so as to cover the outer periphery of the periphery of the opening, and has a plate-like standing member having a surface bent in the outer direction of the periphery of the opening; An opening lid that has a fixed surface that is fixed to the surface of the standing member in a planar shape, and that closes the opening by fixing the surface of the standing member and the fixing surface. 3. The replaceable air filter unit according to 1 or 2.   The exchangeable air filter unit according to any one of claims 1 to 3, wherein a gasket having a circular cross section is provided on a surface of the filter that contacts the filter mounting surface.   The said filter has a HEPA filter and the pre filter which is provided in the upstream of the flow direction of gas from the said HEPA filter, and collects a part of particle | grains in the said gas. The replaceable air filter unit according to the item.

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