JP2009136760A - Hepa (high efficiency particulate air) filter and air cleaning unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an HEPA filter preventing flow-out of gas from a space between the HEPA filter and the inner wall of a vessel with the HEPA filter installed therein, and an air cleaning unit equipped with such an HEPA filter. <P>SOLUTION: The HEPA filter 10 includes flat bodies 12 consisting of a filter medium, and a frame 11 fixedly provided on periphery parts of the flat bodies 12, wherein a contour viewed from a main face 20 of the HEPA filter 10 is in a roughly trapezoidal shape with a pair of facing sides approaching to each other from one end toward the other end, or deformable to a roughly trapezoidal shape. The HEPA filter 10 is set at a setting part 30a of the vessel 30 whose inner peripheral shape of a cross section roughly orthogonal to the advancing direction of gas is roughly trapezoidal shape due to draft, to constitute the air cleaning unit 9. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a manufacturing facility such as a semiconductor device and a pharmaceutical device, and further relates to a HEPA filter used for a system that requires air cleaning means such as a fuel cell power generation system, and an air cleaning unit including the HEPA filter.

  In a fuel cell power generation system, an air cleaning unit including a HEPA filter (High Efficiency Particulate Air Filter) is used to remove particles such as dust from air sent as a reaction gas to the fuel cell. The HEPA filter is an air filter having a particle collection rate of 99.97% or more with respect to particles having a rated air volume and a particle size of 0.3 μm.

  FIG. 13 is a diagram illustrating a configuration of a general fuel cell power generation system. As shown in FIG. 13, the fuel cell power generation system includes a fuel cell 81, a hydrogen generator 82 that supplies fuel gas to the fuel cell 81, and an air supply device 83 that supplies oxidant gas to the fuel cell 81. Have. The hydrogen generator 82 supplies hydrogen gas obtained by reforming the raw material gas to the fuel cell 81 as fuel gas. The air supply device 83 supplies the air purified by the air purification unit 88 to the fuel cell 81 as an oxidant gas. In the fuel cell 81, power is generated by reacting the fuel gas and the oxidant gas with a catalyst.

The catalyst constituting the fuel cell is generally based on platinum. In such a fuel cell, impurities (NOx, SOx, dust, etc.) in the oxidant gas become an obstacle to power generation performance. . Therefore, in the air cleaning unit 88, a HEPA filter 84 for adsorbing particles such as dust and a chemical for adsorbing impurities such as ammonia gas and hydrogen sulfide in a box-shaped container having an air inlet / outlet formed therein. Filters 85 and 86 are stacked in the traveling direction of the gas conducted to the container (see Patent Document 1).
JP 2005-327684 A

  FIG. 14 is a diagram showing a HEPA filter installed in a container in a conventional air purification unit. As shown in FIG. 14, generally, when the suction portion of the HEPA filter 10 is viewed from the front, the HEPA filter 10 has a rectangular shape, and the installation portion of the HEPA filter 10 in the container 30 has a rectangular shape according to the HEPA filter 10. Designed to. However, in reality, the container 30 made of synthetic resin or the like has a draft because it is mass-produced using a mold or the like, and the installation portion of the HEPA filter 10 of the container 30 is substantially trapezoidal. Therefore, when the suction portion of the HEPA filter 10 is viewed from the front, a small amount of gaps D and D are generated between the inner wall of the container 30 that is substantially trapezoidal due to the draft and the rectangular HEPA filter 10. . The draft may be determined at the container design stage, but it is also customarily provided by the mold manufacturer at the time of manufacture, and there is a slight difference in the draft depending on the molding accuracy of the container. Sometimes.

  As described above, when a gap is generated between the inner wall of the container and the HEPA filter, most of the air sucked into the air cleaning unit flows out of the gap, and impurities are contained in the oxidant gas supplied to the fuel cell. Will be included. In particular, in a fuel cell, if even a small amount of particles adhere to the surface of the catalyst, the catalytic activity is hindered. Therefore, a high level of dust collection and removal capability is required for the air purification unit provided in the fuel cell power generation system.

  The present invention has been made to solve the above-described problems, and is capable of preventing gas from flowing out between the HEPA filter and the inner wall of the container in which the HEPA filter is installed, and It aims at providing the air purifying unit provided with such a HEPA filter.

  The HEPA filter according to the present invention includes a face body made of a filter medium and a frame body fixed to the peripheral edge portion of the face body, and a pair of opposing sides close to each other from one end to the other end. It is a HEPA filter.

  Further, in the HEPA filter according to the present invention, the face body has a substantially rectangular shape, and the frame body has a substantially trapezoidal shape in which a pair of sides whose outer circumferences face each other are close to each other from one end to the other end. The circumference is substantially rectangular.

  Further, in the present invention, in the HEPA filter, the face body has a substantially trapezoidal shape in which a pair of opposite sides are close to each other from one end to the other end, and the outer periphery of the frame body is also substantially trapezoidal. It is.

  The HEPA filter according to the present invention is a HEPA filter that includes a face body made of a filter medium and a frame body provided at a peripheral portion of the face body, and is used by being installed in the installation portion of a container having a substantially trapezoidal installation portion. And when it installs in the said installation part of the said container, it is comprised so that it can deform | transform into the substantially trapezoid shape along the shape of the installation part of the said container by shrink | contracting one side among four sides.

  Also, in the HEPA filter according to the present invention, the face body has a substantially rectangular shape formed by folding a sheet-like filter medium into a bowl shape, and the frame body is substantially the same as a fold crease in a peripheral portion of the face body. It is a substantially U-shape fixed to three sides excluding one side that is orthogonal.

  Also, in the HEPA filter according to the present invention, the face body has a substantially rectangular shape formed by folding a sheet-like filter medium into a bowl shape, and the frame body is substantially the same as a fold crease in a peripheral portion of the face body. It is a rectangular frame provided with a stretchable first frame member fixed on one orthogonal side and a non-stretchable second frame member fixed on three sides excluding the one side. .

  Further, in the present invention, in the HEPA filter, a layer made of a foamable resin is formed on an outer periphery of the frame body.

  In the HEPA filter according to the present invention, a layer made of a sealing material that is expanded by heat is formed on the outer periphery of the frame body.

  The air purification unit according to the present invention has a substantially rectangular parallelepiped shape in which one of the six faces is a lid, and is provided with a gas inlet and an outlet, and is substantially orthogonal to the gas traveling direction flowing from the inlet toward the outlet. An inner peripheral shape of the cross-section to be substantially trapezoidal, and the HEPA filter installed in the container, wherein the face body of the HEPA filter is substantially orthogonal to the gas traveling direction in the container, The longer side of the set of parallel sides of the HEPA filter is in contact with the lid of the container, and the remaining three sides are in contact with the surface of the container other than the lid.

  The present invention has the following effects.

  ADVANTAGE OF THE INVENTION According to this invention, the outflow of the gas from between a HEPA filter and the inner wall of the container in which this HEPA filter was installed can be prevented. Therefore, the particle collection rate of the HEPA filter of the air purification unit provided with the HEPA filter does not decrease, and the performance of the air purification unit can be ensured.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout the drawings, and redundant description thereof is omitted.

Embodiment 1

  A HEPA filter and an air cleaning unit according to Embodiment 1 of the present invention will be described. 1 is an exploded perspective view showing a configuration of an air purification unit according to Embodiment 1, FIG. 2 is a front view showing a HEPA filter according to Embodiment 1, and FIG. 3 is a modification of the HEPA filter according to Embodiment 1. FIG. 4 is an exploded perspective view showing the structure of the container, and FIG. 5 is a cross-sectional view showing the HEPA filter built in the container.

  As shown in FIG. 1, the air purification unit 9 includes a substantially rectangular parallelepiped container 30 and a HEPA filter 10 installed in the container 30. Usually, in the container 30, in addition to the HEPA filter 10 that is a dust collection filter, a chemical filter that collects chemical substances such as hydrogen sulfide and ammonia is laminated. Such an air purification unit 9 can be provided, for example, in a path for supplying an oxidant gas to the fuel cell in a fuel cell power generation system. Hereinafter, each of the HEPA filter 10 and the container 30 provided in the air cleaning unit 9 will be described in detail.

  First, the configuration of the HEPA filter 10 will be described.

  As shown in FIG. 2, the HEPA filter 10 includes a face body 12 made of a filter medium, and a frame body 11 fixed to the peripheral edge of the face body 12. Hereinafter, two surfaces of the HEPA filter 10 where the face body 12 is exposed are referred to as “main surfaces 20, 20”, and four surfaces substantially perpendicular to the main surfaces 20, 20 are referred to as “circumferential surfaces 24”. The HEPA filter 10 has a substantially trapezoidal shape when the main surface 20 is viewed from the front, and one set of opposing sides among the four sides forming the outer shape of the main surface 20 is from one end to the other. Are close to each other.

  The face body 12 functions as an adsorbing portion of the HEPA filter 10 and collects airborne fine particles by a filtering action. The face body 12 is made of a sheet-like filter medium made of glass fiber, natural fiber, synthetic fiber, metal fiber, or plastic film. The sheet-shaped filter medium constituting the face body 12 is selected so that the HEPA filter 10 has a particle collection rate of 99.97% or more with respect to particles having a rated air volume and a particle size of 0.3 μm.

  In order to increase the surface area, the sheet-like filter medium constituting the face body 12 is used by bending a rectangular shape into a bowl shape, and the face body 12 has a substantially rectangular shape as a whole. Hereinafter, for convenience of explanation, two sides substantially perpendicular to the fold fold M of the face body 12 are referred to as “upper side 12a” and “lower side 12c”, and two sides substantially parallel to the fold fold M are also referred to as “side 12b, 12b ".

  The frame 11 is a substantially rectangular frame, and the inner peripheral shape of the frame is a substantially rectangular shape that matches the outer peripheral shape of the face body 12, and the peripheral edge of the face body 12 is fixed to the inner peripheral surface of the frame body 11. The width of a pair of sides to which the side edges 12b and 12b of the face body 12 are fixed is continuously reduced from one end to the other end of the frame body 11, and the outer peripheral shape of the frame body 11 is the face body 12. It is substantially trapezoidal with the side to which the upper side 12a is fixed as the upper base and the side to which the lower side 12c is fixed as the lower base.

  Thus, the outer periphery of the main surface 20 when viewed from the front is obtained by fixing the peripheral edge of the face body 12 having a substantially rectangular outer peripheral shape to the inner periphery of the frame body 11 having a substantially trapezoidal outer peripheral shape. A substantially trapezoidal HEPA filter 10 is configured in which a pair of opposing sides approach each other from one end to the other end.

  However, as shown in FIG. 3, the peripheral edge portion of the substantially trapezoidal face body 12 in which a pair of opposite sides are close to each other from one end to the other end is surrounded by a frame body 11 having a substantially uniform width. The HEPA filter 10 having an approximately trapezoidal outer shape when the surface 20 is viewed from the front can also be configured. In such a HEPA filter 10, the outer peripheral shape of the face body 12 and the outer peripheral shape of the frame body 11 are both substantially trapezoidal. The face body 12 can be expanded and contracted in a direction substantially perpendicular to the crease fold M by widening or narrowing the distance between the ridge and valley of the ridge, and the substantially rectangular face body 12 can be deformed into a substantially trapezoidal shape. . Accordingly, the frame body 11 is formed in a substantially trapezoidal shape in which a pair of opposing sides having a substantially uniform width are close to each other from one end to the other end, and the peripheral edge portion of the face body 12 is formed on the inner periphery of the frame body 11. Is fixed, the face body 12 has a substantially trapezoidal shape in which a pair of sides whose outer peripheral shapes oppose each other are close to each other from one end to the other end.

  In addition, the face body 12 is fixed to the frame body 11 using an adhesive that does not generate contamination. Examples of such an adhesive include acrylic adhesives such as Loctite 330 (manufactured by Henkel Japan Co., Ltd., “Loctite” is a registered trademark of Henkel Corporation), and Loctite Hysol U-10FL (manufactured by Henkel Japan K.K.). Both “Loctite” and “Hysol” include urethane adhesives such as registered trademarks of Henkel Corporation.

  Moreover, at least the outer peripheral part of the frame 11 is comprised with synthetic resin foams, such as a polyethylene foam, a polypropylene foam, a urethane foam. Thus, by constituting at least the outer peripheral portion of the frame 11 with a foam, when the HEPA filter 10 is installed in the container 30, the frame 11 abuts against the inner wall of the container 30 and compresses and deforms. Thus, both shape errors can be absorbed and the frame 11 and the inner wall of the container 30 can be brought into close contact with each other.

  Next, the configuration of the container 30 in which the HEPA filter 10 is housed will be described.

  As shown in FIG. 4, the container 30 is a substantially rectangular parallelepiped whose one surface is a lid, and is composed of a container lid 31 and a container body 32. If the surface facing the container lid 31 of the container body 32 is a bottom surface 47 and the four surfaces substantially orthogonal to the bottom surface 47 are side surfaces 43, 44, 45, 46, a pair of side surfaces 44, 43 facing each other out of the side surfaces is formed. A gas inlet 41 and an outlet 42 are respectively provided. Since the gas flowing into the container 30 from the inlet 41 flows out from the outlet 42, the gas traveling direction in the container 30 is a direction from the inlet 41 toward the outlet 42.

  The container 30 is, for example, a molded product of a resin material such as polypropylene (PP) or polyphenylene sulfide (PPS) or a metal material such as stainless steel or aluminum. Since the container lid 31 and the container main body 32 are mass-produced using a mold such as a mold, the container main body 32 is provided with a draft for convenience when releasing the molded product from the mold. Yes. The draft angle is provided on the side surfaces 43, 44, 45, and 46 of the container body 32, and the side surfaces 43, 44, 45, and 46 are angled from a substantially right angle to the bottom surface 47 of the container body 32 (for example, Tilted outward by about 1 degree).

  And the HEPA filter 10 of the said structure is installed in the container 30 of the said structure, and the air purifying unit 9 is comprised.

  As shown in FIGS. 1 and 5, the main surfaces 20 and 20 of the HEPA filter 10 installed inside the container 30 are substantially orthogonal to the gas traveling direction in the container 30. The cross-sectional shape substantially orthogonal to the gas traveling direction in the container 30 is a substantially trapezoidal shape formed by the side surfaces 45 and 46, the bottom surface 47 and the container lid 31. Therefore, as shown in FIG. 4, the installation portion 30 a of the HEPA filter 10 in the container 30, that is, the shape of the space in which the HEPA filter 10 is arranged in the container 30 is substantially the same as viewed from the gas traveling direction in the container 30. It will be trapezoidal.

  In such an air cleaning unit 9, the container 30 and the HEPA filter 10 are designed such that all the peripheral surfaces 24 of the HEPA filter 10 installed in the installation part 30 a of the container 30 are in contact with the inner wall of the container 30. . Specifically, the four sides 21, 22, 23, and 23 forming the outer shape of the main surface 20 of the HEPA filter 10 are also included in the peripheral surface 24, and one of these four sides 21, 22, 23, and 23 is included. The longer side (hereinafter referred to as “upper base 21”) of the pair of parallel sides contacts the container lid 31, and the shorter side (hereinafter referred to as “lower base 22”) is the bottom surface 47 of the container body 32. The shape of the container 30 and the HEPA filter 10 is determined so that a pair of non-parallel two sides (hereinafter referred to as “slope sides 23, 23”) are in contact with the side surfaces 45, 46 of the container body 32. .

  At this time, since at least the outer periphery of the frame 11 of the HEPA filter 10 is made of foam, the outer peripheral shape of the HEPA filter 10 is designed to be slightly larger than the inner peripheral shape of the installation portion 30a of the container 30, In order to improve the adhesion between the HEPA filter 10 and the container 30, it is desirable that the HEPA filter 10 is embedded in the container 30 in a state where the foam is compressed.

  Further, as shown in FIG. 2, in the four sides constituting the main surfaces 20 and 20 of the HEPA filter 10, an angle R formed by an angle substantially perpendicular to the upper base 21 and the hypotenuses 23 and 23 is, for example, 1 to 3 degrees. Designed with a range of This angle is determined according to the draft angle provided on the side surfaces 45 and 46 of the container 30.

  In the air cleaning unit 9 having the above configuration, when the inside of the container 30 is viewed from the traveling direction of the gas flowing from the inlet 41 to the outlet 42, in other words, when the main surface 20 of the HEPA filter 10 is viewed from the front, 30 has a substantially trapezoidal shape because of the draft, but the shape of the substantially trapezoidal installation portion 30a and the outer shape of the HEPA filter 10 match each other, so that the inner wall of the container 30 and the HEPA There is no gap between the filter 10 and the peripheral surface 24. Therefore, in this air cleaning unit 9, the HEPA filter 10 can exhibit an appropriate dust collection function.

Embodiment 2

  Next, a HEPA filter and an air cleaning unit according to Embodiment 2 of the present invention will be described. 6 is an exploded perspective view showing the configuration of the air purification unit according to the second embodiment, FIG. 7 is a front view showing the HEPA filter according to the second embodiment, and FIG. 8 is a first view of the HEPA filter according to the second embodiment. FIG. 9 is a front view showing a second modification of the HEPA filter according to Embodiment 2, and FIG. 10 is a cross-sectional view showing the HEPA filter built in the container. Note that the HEPA filter and the air purification unit according to the second embodiment are different from the HEPA filter and the air purification unit according to the first embodiment in the structure of the HEPA filter 10. Therefore, in the following, the HEPA filter 10 will be described in detail, and the other description will be omitted.

  As shown in FIGS. 6 and 10, the air purification unit 9 includes a substantially rectangular parallelepiped container 30 and a HEPA filter 10 installed in an installation part 30 a in the container 30. The HEPA filter 10 is disposed so that the traveling direction of the gas flowing in the container 30 from the inlet 41 toward the outlet 42 is substantially orthogonal to the main surfaces 20 and 20 thereof. And the inner peripheral shape of the cross section substantially orthogonal to the gas traveling direction of the installation portion 30 a of the container 30 is substantially trapezoidal due to the draft provided in the container 30. Therefore, in the air cleaning unit 9 according to the present embodiment, when the inside of the container 30 is viewed from the traveling direction of the gas flowing from the inlet 41 toward the outlet 42, in other words, the main surface 20 of the HEPA filter 10 is viewed from the front. In this case, the HEPA filter 10 is deformed into a substantially trapezoidal shape along the shape of the installation portion 30a of the container 30 by contracting the length of one side among the four sides forming the outer shape of the main surface 20 thereof. In the state, it is installed in the installation part 30 a of the container 30. Note that one side whose length contracts among the four sides forming the outer shape of the main surface 20 of the HEPA filter 10 is a side that contacts the bottom surface 47 when installed on the installation unit 30 a of the container 30.

  Hereinafter, the configuration of the HEPA filter 10 will be described. As shown in FIG. 7, the HEPA filter 10 includes a face body 12 made of a filter medium, and a frame body 11 provided at the peripheral edge of the face body 12. The face body 12 is formed by bending a rectangular sheet-shaped filter medium into a bowl shape, and the face body 12 has a substantially rectangular shape as a whole. The face body 12 can be finely adjusted in size in a direction substantially perpendicular to the fold crease M by widening or narrowing the gap between the ridges and valleys of the ridges, and can be deformed from a substantially rectangular shape to a substantially trapezoidal shape. is there.

  The frame 11 is fixed to three sides (upper side 12a, side sides 12b, 12b) excluding one side (lower side 12c) that is substantially orthogonal to the crease fold M of the peripheral edge of the face piece 12, and is substantially U-shaped ( In FIG. 7, it has an upside down substantially U shape. Moreover, at least the outer peripheral part of the frame 11 is comprised with the synthetic resin foam described in Embodiment 1, and the frame 11 has elasticity as a whole. With this configuration, the lower side 12c of the face body 12 of the HEPA filter 10 can freely expand and contract in a direction substantially perpendicular to the crease fold M. Therefore, when the HEPA filter 10 is pressurized from the peripheral surface 24 substantially parallel to the crease fold M, the lower side 12c of the face body 12 contracts, and the HEPA filter 10 has an outer shape of the main surfaces 20 and 20 having a substantially trapezoidal shape. Can be deformed.

  However, as shown in FIG. 8, the first frame member 11 a having elasticity that is fixed to one side (lower side 12 c) that is substantially orthogonal to the fold crease M of the peripheral portion of the face body 12 and the one side are excluded. The substantially rectangular frame 11 composed of the non-stretchable second frame member 11b fixed on the three sides (the upper side 12a, the side sides 12b, 12b) is replaced with a substantially U-shaped frame 11. The HEPA filter 10 can be provided. In this case, if the HEPA filter 10 is pressurized from the circumferential surface 24 substantially parallel to the crease fold M of the face piece 12, the first frame member 11a contracts together with the lower side 12c of the face piece 12, and the outer shapes of the main faces 20, 20 The HEPA filter 10 can be deformed so as to have a substantially trapezoidal shape.

  Alternatively, as shown in FIG. 9, the HEPA filter 10 is arranged on a substantially rectangular face 12, a rectangular frame 11 surrounding the face 12 with a substantially uniform width, and an outer periphery of the frame 11. It can also be constituted by the layer 15 made of the formed synthetic resin foam. As the synthetic resin foam constituting the layer 15 made of the synthetic resin foam, the same type as described in the first embodiment can be used. In this case, the HEPA filter 10 can be deformed so that the outer shapes of the main surfaces 20 and 20 are substantially trapezoidal by pressurizing and shrinking the layer 15 made of the synthetic resin foam of the HEPA filter 10.

  As shown in FIGS. 6 and 10, the HEPA filter 10 configured as described above has four sides forming the outer shape of the main surface 20 of the HEPA filter 10 in a state where the HEPA filter 10 is installed in the installation part 30 a of the container 30. Among them, the upper base 21 is in contact with the container lid 31, the oblique sides 23, 23 are in contact with the side faces 45, 46 of the container main body 32, the lower base 22 is in contact with the bottom 47 of the container main body 32, and the lower base 22 Is contracted to a substantially trapezoidal shape (a substantially trapezoidal shape close to each other from one end to the other end) along the shape of the installation portion 30a.

  Needless to say, in the air cleaning unit 9, the HEPA filter 10 is deformed and accommodated in the installation portion 30a of the container 30 as described above, and the peripheral surface 24 of the HEPA filter 10 is located on the inner periphery of the installation portion 30a of the container 30. The sizes of the container 30 and the HEPA filter 10 are designed so as to have a contact relationship.

  As described above, in the air cleaning unit 9, since the HEPA filter 10 is deformed, there is no gap between the inner wall of the container 30 and the peripheral surface 24 of the HEPA filter 10, so the HEPA filter 10 exhibits an appropriate dust collecting function. can do. Moreover, even if a variation in draft angle occurs in each of the containers 30 that are mass-produced, the lower base 22 of the HEPA filter 10 can be expanded and contracted to such an extent that the variation can be sufficiently absorbed, and the container 30 and the HEPA filter 10 Since high accuracy is not required for the shape, it is possible to contribute to improvement in productivity of the container 30 and the HEPA filter 10 and reduction in manufacturing cost.

Embodiment 3

  Next, a HEPA filter and an air cleaning unit according to Embodiment 3 of the present invention will be described. The HEPA filter and air purification unit according to Embodiment 3 is provided with a thermal expansion sealing material layer 13 on the peripheral surface 24 of the HEPA filter 10 compared to the HEPA filter and air purification unit according to Embodiment 1 described above. Is different. Therefore, in the following, the HEPA filter 10 will be described in detail, and the other description will be omitted.

  FIG. 11 is a front view showing the HEPA filter according to the third embodiment, FIG. 12 is a diagram for explaining an operation process for installing the HEPA filter in the container, (a) shows a state before heating, and (b) shows after the heating. FIG.

  As shown in FIG. 11, the HEPA filter 10 includes a substantially rectangular face body 12 made of a filter medium and a substantially rectangular frame body 11, and the peripheral edge of the face body 12 is fixed to the inner periphery of the frame body 11. ing. On the outer peripheral surface of the frame 11, a thermal expansion sealing material layer 13 is formed by applying or sticking a thermal expansion sealing material. Here, the “thermal expansion sealing material” refers to a material that expands when heated to a predetermined temperature and retains its shape once expanded. The thermal expansion sealing material is, for example, a trade name of Fibro (Fiblo is a registered trademark of Sekisui Chemical Co., Ltd.) and a trade name of Microsphere (Kureha Microsphere is a registered trademark of Kureha Co., Ltd.).

  The HEPA filter 10 shown in FIG. 11 has a substantially rectangular shape, but may have a substantially trapezoidal shape. Further, the thermal expansion sealing material layer 13 may be formed on the peripheral surface 24 of the HEPA filter 10 according to the first embodiment or the second embodiment.

  The HEPA filter 10 having the above-described configuration is installed in the installation unit 30a of the container 30, and the air purification unit 9 is configured. The work process for installing the HEPA filter 10 in the installation part 30a of the container 30 is as follows.

  First, the HEPA filter 10 is disposed on the installation portion 30 a of the container body 32. At this time, the traveling direction of the gas determined by the gas inlet 41 and the outlet 42 of the container 30 is substantially orthogonal to the main surfaces 20 and 20 of the HEPA filter 10. Next, the container body 32 is sealed with the container lid 31. As shown in FIG. 12A, the HEPA filter 10 arranged in the container 30 in this way does not adhere to the inner wall of the container 30, but is held at a predetermined position (installation portion 30a) in the container 30. It has a size of about. Finally, the HEPA filter 10 together with the container 30 is heated (heated) to a temperature at which the thermal expansion sealing material of the thermal expansion sealing material layer 13 is thermally expanded. As a result, as shown in FIG. 12B, the thermal expansion sealing material layer 13 of the HEPA filter 10 is thermally expanded to close the gap between the HEPA filter 10 and the container 30.

  In consideration of the heating process of the thermal expansion sealing material layer 13 described above, the container 30 of the air cleaning unit 9 is made of a heat-resistant resin such as polyphenylene sulfide (PPS) resin or a metal-based material such as aluminum. Is desirable.

  In the air purification unit 9 in which the HEPA filter 10 is installed in the container 30 by the above operation process, the thermal expansion sealing material layer 13 provided on the peripheral surface 24 of the frame 11 has a gap between the HEPA filter 10 and the container 30. Since it expand | swells so that it may fill, a clearance gap does not arise between the HEPA filter 10 and the container 30. FIG. Therefore, in this air purification unit 9, the HEPA filter 10 can exhibit an appropriate dust collection function. Moreover, even if draft and size variations occur in each of the containers 30 that are mass-produced, the gap between the container 30 and the HEPA filter 10 caused by these is filled with the thermal expansion sealing material layer 13. Since high accuracy is not required for the shapes of the 30 and the HEPA filter 10, it is possible to contribute to the improvement of the productivity of the container 30 and the HEPA filter 10 and the reduction of the manufacturing cost.

  The HEPA filter and the air purification unit according to the present invention are useful in industrial fields that require clean air, such as fuel cell systems, manufacturing equipment in the semiconductor field and pharmaceutical equipment field.

It is a disassembled perspective view which shows the structure of the air purifying unit which concerns on Embodiment 1. FIG. 1 is a front view showing a HEPA filter according to Embodiment 1. FIG. 6 is a front view showing a modification of the HEPA filter according to Embodiment 1. FIG. It is a disassembled perspective view which shows the structure of a container. It is sectional drawing which shows the HEPA filter built in the container. It is a disassembled perspective view which shows the structure of the air purifying unit which concerns on Embodiment 2. FIG. 6 is a front view showing a HEPA filter according to Embodiment 2. FIG. It is a front view which shows the 1st modification of the HEPA filter which concerns on Embodiment 2. FIG. 10 is a front view showing a second modification of the HEPA filter according to Embodiment 2. FIG. It is sectional drawing which shows the HEPA filter built in the container. 10 is a front view showing a HEPA filter according to Embodiment 3. FIG. It is a figure explaining the operation | work process which equips a container with a HEPA filter, (a) is a state before a heating, (b) is a figure which shows the state after a heating. It is a figure explaining the structure of a general fuel cell power generation system. It is a figure which shows the HEPA filter installed in the container in the conventional air purification unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 9 Air purification unit 10 HEPA filter 11 Frame body 12 Face body 12a Upper side 12b Side side 12c Lower side 13 Thermal expansion sealing material layer 20 Main surface 20, 20
21 Upper base 22 Lower base 23 Side 24 Peripheral surface 24
30 Container 30a Installation part 31 Container lid 32 Container body 41 Inlet 42 Outlet 43, 44, 45, 46 Side surface 47 Bottom surface

Claims (9)

  A substantially trapezoidal HEPA filter comprising a face piece made of a filter medium and a frame fixed to the peripheral edge of the face piece, and having a pair of opposing sides close to each other from one end to the other end. The face body has a substantially rectangular shape, and the frame body has a substantially trapezoidal shape in which a pair of sides facing the outer periphery are close to each other from one end to the other end, and the inner periphery is a substantially rectangular shape.
The HEPA filter according to claim 1. The face body has a substantially trapezoidal shape in which a pair of opposite sides are close to each other from one end to the other end, and the outer periphery of the frame is also substantially trapezoidal.
The HEPA filter according to claim 1. A HEPA filter comprising a face piece made of a filter medium and a frame provided at a peripheral portion of the face piece, and installed and used in the installation part of a container having a substantially trapezoidal installation part,
A HEPA filter configured to be deformable into a substantially trapezoidal shape along the shape of the container installation part by contracting one of the four sides when installed in the installation part of the container. The face body is a substantially rectangular shape formed by folding a sheet-like filter medium into a bowl shape,
The frame body is substantially U-shaped fixed to three sides excluding one side that is substantially orthogonal to the crease fold in the peripheral portion of the face piece.
The HEPA filter according to claim 4. The face body is a substantially rectangular shape formed by folding a sheet-like filter medium into a bowl shape,
The frame body includes a first frame member having elasticity that is fixed to one side substantially perpendicular to the crease fold of the periphery of the face piece, and a non-stretching property that is fixed to three sides excluding the one side. A rectangular frame provided with a second frame member of
The HEPA filter according to claim 4. A layer made of a foamable resin is formed on the outer periphery of the frame,
The HEPA filter according to claim 4. A layer made of a sealing material that expands due to heat is formed on the outer periphery of the frame,
The HEPA filter according to any one of claims 1 to 7. A substantially rectangular parallelepiped shape in which one of the six faces is a lid, and an inner peripheral shape of a cross section substantially perpendicular to the traveling direction of the gas flowing from the inlet toward the outlet is provided. A container having a shape, and the HEPA filter according to any one of claims 1 to 8 installed in the container,
The face of the HEPA filter is substantially orthogonal to the gas traveling direction in the container, the longer side of the set of parallel sides of the HEPA filter is in contact with the lid of the container, and the remaining three sides are In contact with a surface of the container other than the lid,
Air purification unit.

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