Filter holding device of air cleaning device

Abstract

To provide a filter holding device which is preferably used for an air cleaning device which achieves reduction of the number of components, thereby forming a simple structure enabling easy assembly and disassembly.SOLUTION: A holding device of a filter Fm which is replaceably installed upright at a suction port Ai which is open on a standing wall of an air cleaning device Ac. The holding device includes: a cylindrical filter holding part Hf having a function for supporting and holding the filter Fm; and attachment frame parts 1 to 4 which are formed integrally with the tip side of the holding part Hf and attached to the suction port Ai.SELECTED DRAWING: Figure 15

Description

[Technical Field]

[0001] The present invention relates to a filter holder that is replaceably mounted on a device (hereinafter referred to as an air purifier) ​​equipped with an air filter that purifies the air in a space and recirculates it back into the space or exhausts it to the outside, and is used in spaces such as clean rooms in pharmaceutical and cosmetic manufacturing plants and research facilities that handle substances that are harmful or potentially harmful to the human body and the environment, or hazard control rooms, hazard control cabinets, and draft chambers that are installed for the purpose of isolation against biohazards or radioactive materials. [Background technology]

[0002] BACKGROUND ART Air purifying devices have been used in various industrial fields for purifying the air inside equipment such as hazard control rooms and draft chambers.

[0003] An example of a known air purifying device is one that is formed with a housing having a wall structure in the shape of a vertically long, approximately rectangular parallelepiped, an air intake opening formed in the lower part of the front wall of the housing, an air exhaust opening formed in the upper wall of the housing, a HEPA filter (High Efficiency Particulate Air Filter, hereinafter referred to as the filter unit) that is detachably mounted on a stand in a position that traverses the interior of the housing at a midpoint in the height direction of the housing above the air intake, and a filter replacement port with a lid provided on the front wall of the housing above the filter unit. It should be noted that there is also an air cleaning device that uses a unitized ULPA filter (Ultra Low Penetration Air Filter, hereinafter, included in the filter unit) instead of the filter unit.

[0004] Conventional air purifying devices (hereinafter simply referred to as "devices"; see Patent Documents 1 and 2) have a structure in which an air intake is formed at the bottom of the front wall, a stand for supporting a filter unit horizontally is provided above the air intake inside the housing, and the filter unit is installed in a horizontal position on the stand, which has led to the following problems:

[0005] In conventional devices, the filter unit is placed in a horizontal position inside a housing, and therefore the housing needs to have a depth that can accommodate at least the front-to-rear width of the filter unit in the horizontal position.

[0006] In other words, a filter unit having an air filtration surface of a required area has a front-to-back width (depth) corresponding to the filtration area when in a horizontal position, which creates the drawback that the front-to-back width (depth) of the housing must be increased.

[0007] Furthermore, in conventional devices, the air intake is located at the bottom of the front wall of the housing, and the interior of the housing from the air intake to the air filtration surface (primary side) of the filter unit installed horizontally inside the housing is the contaminated area of ​​the air purifying device.

[0008] Furthermore, when replacing the filter in the filter unit, in order to prevent harmful substances adhering to the contaminated area, including the air filtration surface (primary side) of the filter unit, from scattering, the contaminated area is washed with water, chemicals, etc. However, because the area to be cleaned is inside the housing downstream from the air intake, it is difficult to visually check the cleaning status. In addition, it is difficult to visually check the inside of the housing, including the air filtration surface of the filter unit, from the air intake, which has been pointed out as a problem that makes the cleaning work difficult.

[0009] Furthermore, in conventional devices, the filter unit is installed horizontally inside the housing, so for filter replacement, inspection, etc., a filter replacement port with a lid had to be provided on the front wall of the housing above the installation height of the filter unit.

[0010] The inventors of the present invention have proposed a new air purifying device that completely solves the above-mentioned problems of conventional air purifying devices in Patent No. 6993121 (see Patent Document 3). That is, the proposed air purifying device is configured with a housing with a wall structure that forms the main body of the device, an air intake port formed in the front wall of the housing, a filter unit detachably attached in front of the air intake port in a vertical front position so as to close the air intake port, and an air exhaust port that is connected via a duct to an external fan provided on the top wall of the housing.

[0011] In the proposed device, if the vertical and horizontal dimensions of the front wall of the housing (the size of the front wall) are formed to a size that can accommodate the filter unit in its front-facing shape (upright position), the front-to-back width (depth dimension) of the housing can be formed to a size that corresponds to the front-to-back width (depth amount) of the filter unit when upright.

[0012] As described above, the proposed air purification device is formed by comprising a housing that forms the main body, an air intake port provided on the front of the housing, a filter unit that is detachably arranged in front of the air intake port in a vertical, frontal position so as to cover the air intake port, and an exhaust port that is connected via a duct to an external fan provided on the top surface (wall) of the housing. This has the advantage that the front-to-back width (depth) of the housing can be made small, and the size of the installation space for the exhaust equipment in the hazard control room can be reduced in the depth direction of the housing.

[0013] Furthermore, because the filter unit is detachably mounted in a vertical, upright position on the front of the housing, the inside of the housing does not become a contaminated area, and therefore there is no need to clean the inside of the housing with water, etc. Furthermore, because the filter is placed in a vertical, upright position on the front wall (standing wall) of the housing, all tasks such as filter maintenance, filter replacement, and washing with water if necessary can all be carried out in areas outside the housing, which has the advantage of improving work accuracy and increasing work efficiency.

[0014] Here, the filter unit used in the proposed device must be able to be airtightly attached in an upright position from the front of the air intake port provided on the front wall of the housing, and must also be able to be easily attached and detached from the air intake port when replacing the filter.

[0015] Therefore, the inventors of the present invention have proposed a filter unit suitable for use in a previously patented air purifying device (see Patent Document 3) in Japanese Patent No. 6993122 (see Patent Document 4).

[0016] The previously proposed filter unit comprises an outer frame that is annular when viewed from the front and has an L-shaped (or inverted L-shaped) cross section with a flange, a cylindrical inner frame that extends rearward from the back of the outer frame to cover the outer periphery of the filter and is connected to the outer frame, and a pressing member that presses the filter stored in the inner frame from the rear to the front of the inner frame.Therefore, it was essential to have a frame connecting structure for connecting the outer frame and inner frame with screws or the like, an airtight structure for the connecting part that interposes a gasket or the like at the connecting part to maintain airtightness at the connecting part, and a pressing member connecting structure that connects the pressing member that presses and supports the filter to the rear end of the inner frame. [Prior art documents] [Patent documents]

[0017] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-10743 [Patent Document 2] Patent No. 4627310 [Patent Document 3] Patent No. 6993121 [Patent Document 4] Patent No. 6993122 Summary of the Invention [Problem to be solved by the invention]

[0018] The filter unit proposed in Patent Document 4 requires several main parts, namely an outer frame, an inner frame, and a clamping member, and also requires a connecting structure between the inner and outer frames, an airtight structure at the connecting parts, and a connecting structure for the clamping member. This makes the overall structure of the filter unit complex, and also makes the assembly of the filter unit and disassembly for filter conversion complicated.

[0019] Therefore, the objective of the present invention is to provide a filter holding device suitable for use in an air purifier, which has a simple structure that reduces the number of parts and allows for easy assembly and disassembly, as well as filter replacement, so that the filter can be held and installed directly at the suction port. [Means for solving the problem]

[0020] The configuration of the present invention, which has been made with the aim of solving the above-mentioned problems, is a filter holding device that is installed in an upright position so that it can be replaced at an air suction port opening in the vertical wall of an air purification device, and is characterized in that the holding device comprises a cylindrical filter holding portion that has the function of supporting and holding the filter, and a mounting frame portion that is formed integrally with the tip side of the holding portion and is attached to the suction port. In the present invention, the standing wall means a wall on which a suction port is provided, and in an apparatus such as a draft chamber, the standing wall is a concept that includes the inner wall of the working space.

[0021] In the present invention, the short side portions of the approximately L-shaped cross section arranged on the edge of the suction port, which are positioned at the top and bottom of the suction port when viewed from the front, are referred to as the upper and lower mounting frame portions of the suction port, and the portions positioned on the left and right sides of the suction port are referred to as the left and right mounting frame portions of the suction port.

[0022] The four plate-like members, each with an approximately L-shaped cross section, which have upper and lower mounting frame portions and mounting frame portions on both the left and right sides, form a cylindrical filter holding portion that is approximately square when viewed from the front by joining the adjacent portions of the adjacent longitudinal side members.

[0023] In the state described in paragraphs 0021 and 0022 above, the mounting frame portions located at the top and bottom of the suction port and the mounting frame portions located on both the left and right sides are not connected at the four corners of the suction port, and these non-connected portions form gaps.

[0024] In the present invention, in order to fill the gaps in the non-connected portions formed at the locations corresponding to the four corners of the suction port in the four mounting frame portions arranged on the outer edge of the suction port, a corner member is placed in at least one of the gaps to join the non-connected portions of the mounting frame portions.

[0025] The corner member is made up of a joint plate material that is joined flush with the surface of the short side portion of the mounting frame, and a corner cover that covers the entire surface of the joint plate material from the outside.

[0026] In the present invention, the plate-like member with an approximately L-shaped cross section that constitutes the mounting frame portion and the cylindrical filter holding portion formed behind this mounting frame portion, or the cylindrical filter holding portion, can be made of aluminum-based extruded material or the like. [Effects of the Invention]

[0027] The present invention provides a filter holder for an air purifier that is installed in an upright position so that it can be replaced at an air suction port opening in a vertical wall of the air purifier. The holder is configured to include a cylindrical filter holder that supports and holds the filter, and a mounting frame that is integrally formed at the tip of the holder and attached to the suction port. By integrating the filter holder and the mounting frame that attaches to the suction port into a single-part structure, the number of parts can be reduced. Furthermore, because it is a single-part structure, the mounting frame can be installed directly at the suction port while holding the filter, simplifying operations such as installing and replacing the filter. Furthermore, if the filter holder is pre-formed into a single cylindrical shape by extrusion molding, the number of parts can be further reduced.

[0028] In the present invention, filter replacement can be performed easily and simply by removing the mounting frame portion of the filter holding device of the present invention from the suction port, and the cylindrical holding portion that is integral with the cylindrical frame portion that holds the filter can also be pulled out from the suction port. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 2 is a front view of an example of a filter holding device according to the present invention. [Figure 2] FIG. 2 is a right side view of the filter holding device of FIG. 1. [Figure 3] FIG. 2 is a plan view of the filter holding device of FIG. 1. [Figure 4] 2 is an end view of the filter holding device of FIG. 1 taken along the line AA. [Figure 5] BB arrow end view of the filter holding device of FIG. 1. [Figure 6] 2 is a front view of the filter holder of FIG. 1 without the corner members attached. [Figure 7] 7 is an enlarged perspective view of the front side of the filter holding device of FIG. 6 in a state where the gap is closed by a connecting plate of a corner member. [Figure 8] FIG. 8 is an enlarged perspective view of the rear side of the filter holding device of FIG. 7. [Figure 9] FIG. 10 is a perspective view of the rear side of a corner member in which a joint plate and a corner cover are integrated. [Figure 10] FIG. 10 is a perspective view of the front surface side of the corner member of FIG. 9. [Figure 11] FIG. 10 is a rear view of the corner member of FIG. 9 . [Figure 12] FIG. 12 is a right side view of the corner member of FIG. 11 . [Figure 13] (a) is a schematic oblique view illustrating the manner in which the long side members of four plate-like members with an approximately L-shaped cross section that constitute the upper and lower mounting frame portions and the left and right mounting frame portions in the filter holding device of the present invention are connected to each other, and (b) is a partially enlarged view of (a). [Figure 14] FIG. 14 is a schematic perspective view illustrating a state in which the filter holding device of the present invention illustrated in FIGS. 1 to 13 is attached to an air cleaning device. [Figure 15] FIG. 15 is a longitudinal side view of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0030] Next, an example of the filter holding device Fu of the present invention will be described with reference to the drawings.

[0031] 14 and 15 are a perspective view and a longitudinal side view of an example of an air purifying device Ac equipped with an example of a filter holding device Fu of the present invention. In Fig. 14 and Fig. 15, Ca is a housing that forms the main body of the air purifying device Ac, Ai is an air suction port formed in the front wall (front panel) Fp of the housing Ca, and the filter holding device Fu of the present invention is airtightly and detachably attached to the suction port Ai in an upright position with bolts b. Fm is a filter.

[0032] 14 and 15, Cw is the mounting wall of the air purification device Ac in the installation space Cr such as a clean room, and F is the installation floor surface of the air purification device Ac. In the housing Ca, Ex is the exhaust port, Fn is the filter measurement nozzle placed between the rear surface of the filter holder Fu and the exhaust port Ex, Ip is the differential pressure meter box placed above the suction port Ai, and Ba is the installation base of the housing Ca.

[0033] Next, the basic configuration of the filter holder Fu of the present invention, which is detachably attached to the air purifying device Ac outlined in Figures 14 and 15, will be described with reference to Figures 1 to 6. In this specification, when viewing the open rectangular suction port Ai from the front, the upper side is the upper part, the lower side is the lower part, the left side is the left side, the right side is the right side, and the direction toward the back of the housing from the suction port Ai is the inside of the housing.

[0034] In Figures 1 to 6, 1 is the mounting frame portion at the top of the suction port Ai when viewed from the front, 2 is the mounting frame portion at the bottom of the suction port Ai, 3 is the mounting frame portion at the left side of the suction port Ai, and 4 is the mounting frame portion at the right side of the suction port Ai.

[0035] The four mounting frame portions 1 to 4 are configured by short side portions Sp of four plate-like members Pm each having a substantially L-shaped cross section.

[0036] The longitudinal portions Lp of the four plate-like members Pm, each having an approximately L-shaped cross section, are positioned as members extending toward the innermost part of the housing of the suction port Ai and are joined (bonded) together to form a rectangular cylindrical shape, forming the filter Fm holding portion Hf that wraps around and holds the filter Fm from the outer surface.

[0037] When the upper and lower mounting frame portions 1, 2 and the left and right mounting frame portions 3, 4 are positioned in their corresponding positions relative to the suction port Ai, the four plate-shaped members Pm and their respective short side portions Sp and long side portions Lp are positioned as shown in Figure 13(a).

[0038] In the four plate-like members Pm arranged as shown in Figure 13(a), adjacent longitudinal side portions Lp at 90-degree angles are joined together by threading a screw B through the screw hole Bh of one side and into the screw groove Bg of the other side, as shown in Figure 13(b), forming a rectangular cylinder when viewed from the front. This cylinder serves as the holder Hf for the filter Fm. Note that screw joining is just one example of the means for connecting the longitudinal side portions Lp to each other, and any other suitable joining method can be used, such as adhesive bonding, welding, or connection using other connecting parts.

[0039] 13(a) and 13(b), the four plate-like members Pm are joined together at their longitudinal portions Lp, and each longitudinal portion Lp forms a rectangular cylindrical filter holding portion Hf, resulting in the filter holding device of the present invention shown in the front view of FIG. In this embodiment, the rectangular cylindrical holding portion Hf is formed by joining four plate-like members Pm, but the holding portion Hf may be formed into a rectangular cylindrical shape by extrusion processing from the beginning.

[0040] In the pre-completion state of the filter holding device of the present invention shown in Figure 6, in the upper and lower mounting frame portions 1, 2 formed by the short side portions Sp of the four plate-shaped members Pm, and the left and right mounting frame portions 3, 4 adjacent to these, gaps (voids, spaces) Sg are created at the longitudinal ends of each adjacent mounting frame portion 1 to 4, where the mounting frame portions 1 to 4 are not continuous and are not connected to each other.

[0041] Since the gaps Sg in the non-connected portions correspond to the four corners of the filter Fm when viewed from the front, sealing at least one of the gaps Sg can further improve airtightness. Also, sealing the four gaps Sg and forming the top, bottom, left, and right mounting frame portions 1 to 4 into a closed, roughly frame-like shape can be expected to further improve airtightness.

[0042] Therefore, in the present invention, adjacent gaps Sg between the upper, lower, left and right mounting frames 1 to 4, which are discontinuously open at a 90-degree angle, are connected by corner members Cm consisting of corner joint plates 5 (hereinafter referred to as joint plates 5) and corner covers 6 as illustrated in Figures 7 and 8, thereby integrating each mounting frame section 1 to 4 into a rectangular frame shape.

[0043] The corner member Cm will be described with reference to FIGS. 7, 8, and 9 to 12. FIG.

[0044] The plate-shaped member Pm has a short side portion Sp and a long side portion Lp with an approximately L-shaped cross section, and the edges along the length of both the short and long side portions Sp and Lp have flange-shaped edge portions Se and Le formed with an L-shaped cross section and a C-shaped cross section.

[0045] Therefore, adjacent 90-degree gaps Sg (also called corners Sg) in the short side portions Sp of the mounting frames 1 to 4 are closed using connecting plates 5 having a rectangular flat surface that follows the shape of the corners Sg and rising portions (flanges) 5a, 5b that are the same height as the edge portions Se of two adjacent sides of this flat surface. The connecting plates 5 are attached to the corresponding mounting frames 1 to 4 by welding or adhesive.

[0046] In this embodiment, a corner cover 6 is placed on top of the connecting plate 5 to form a corner member Cm (see FIGS. 9 to 12). The corner cover 6 also has flanges 6a, 6b on two sides. By providing the corner cover 6, the sealing strength (joint strength) of the 90-degree gap Sg by the connecting plate 5 and the airtightness can be further improved.

[0047] Figure 1 shows the front view of the filter holding device Fu of the present invention in which the corner members Cm are attached to the gaps Sg formed by the ends of adjacent mounting frame portions 1 to 4 at the top, bottom, and left and right mounting frame portions 1 to 4.

[0048] Fig. 2 shows the right side view of the filter holding device Fu of Fig. 1, and Fig. 3 shows the same as seen from above. Fig. 4 is an end view taken along the line AA in Fig. 1, Fig. 5 is an end view taken along the line BB in Fig. 1, and Fm in Fig. 1 is a filter. In Figs. 4 and 5, Ps denotes airtight packing, which is disposed on the back surface of each of the mounting frames 1 to 4.

[0049] An example of the filter holding device Fu of the present invention described above is one in which four plate-shaped members Pm having an approximately L-shaped cross section are arranged with their short side portions Sp as upper and lower mounting frame portions 1, 2 and left and right mounting frame portions 3, 4, and the long side portions Lp of each mounting frame portion 1 to 4 are joined into a rectangular cylindrical shape to form a holding portion Hf for the filter Fm, which can be rephrased as follows.

[0050] That is, another example of the filter holding device Fu of the present invention can be formed by a rectangular cylindrical filter Fm holding portion Hf that surrounds and holds the outer periphery of the filter Fm, and the tip side of this holding portion Hf being formed, for example, in a flange shape as part of the mounting frame portions 1 to 4 of the air purification device Ac, or as part of these mounting frame portions 1 to 4.

[0051] As described above, the present invention comprises a frame-shaped mounting frame portion, a cylindrical filter holding portion formed integrally at the rear (back) of the mounting frame portion, and a filter held in this holding portion to form a filter holding device.Since the filter can be held and installed directly at the suction port, the filter holding device has the advantage of having a small number of parts and the filter can be easily replaced. In this embodiment, an air purifying device is used by being installed on the wall of a clean room, but it can also be applied to a filter holding device for air purifying devices such as draft chambers, hazard control rooms, and hazard control cabinets.

[0052] The filter holding device of the present invention can be made by joining four plate-shaped members having an approximately L-shaped cross section with short side and long side portions and using corner members to form a picture-frame-shaped mounting frame portion and a filter holding portion behind this mounting frame portion, so that a filter holding device with a small number of different parts can be constructed. [Explanation of symbols]

[0053] Ac Air Purifier Ca housing Ai Air Intake b. Bolted (or bolted) Pm Plate-shaped member Lp Long side part Sp Short side part 1,2 Upper and lower mounting frame parts 3,4 Left and right mounting frame parts Hf Filter Fm holder Sg Gap Bh screw hole Bg screw groove B Vis 5. Joint board 6 Corner Covers Cm corner member Fm filter

Claims

1. A filter holding device that is replaceably installed in an upright position at an air suction port opening in the vertical wall of an air purifying device, characterized in that the holding device comprises a cylindrical filter holding portion that has the function of supporting and holding the filter, and a mounting frame portion that is formed at the tip side of the holding portion and is attached to the suction port.

2. A filter holding device according to claim 1, wherein the short side portions of four plate-shaped members each having an approximately L-shaped cross section consisting of a long side portion and a short side portion are formed as the mounting frame portion, and the long side portions of the four plate-shaped members are connected to form the cylindrical filter holding portion.

3. 3. The filter holding device according to claim 2, wherein said mounting frame and said filter holding portion are integrally formed into a cylindrical shape by extrusion molding.

4. A filter holding device according to claim 2 or 3, wherein in the mounting frame portion arranged on the outer peripheral edge of the suction port, at least one corner member is placed in the gap of the non-connected portion formed by each end of the mounting frame portion corresponding to the four corners of the outer peripheral edge of the suction port, and the non-connected portion is joined with the corner member, thereby connecting the mounting frame portions together.

5. 5. The filter holder according to claim 4, wherein said corner member comprises a connecting plate joined flush with the surface of the short side portion of said mounting frame, and a corner cover covering the entire surface of said connecting plate from the outside.

6. An air purifying device equipped with the filter holding device of claim 1.

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