Air filter mounting structure and air purifier

Abstract

To provide a mounting structure of an air filter capable of minimizing a space around an outer frame of the air filter housed within a casing.SOLUTION: A mounting structure includes a bolt, a first locking member and a second locking member. The bolt pushes an outer frame of an air filter housed into a housing part of a casing against a first side in an air flow direction. The first locking member has a locking part which is arranged on the second side in the air flow direction with respect to the air filter, is elongated to the side of a bolt-receiving part and a wall part of the housing part surrounding the outer frame and further is elongated to the first side. The second locking member is provided on a position of the wall part opposite to a position on a circumference of the outer frame on which the first locking member is arranged, and has an opening part which is inserted to the locking part and a support part which supports a tip part of the locking part. The opening part is opened so as to separate the air filter from the bolt receiving part to the first side because the bolt pushes the outer frame in the air flow direction.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a mounting structure for mounting an air filter to a casing, and to an air purifier. [Background technology]

[0002] An air filter for purifying air is disposed inside the air purifier. The air filter includes a filter medium for collecting fine particles such as dust particles in the air, and an outer frame surrounding the filter medium. The air purifier takes in external air, passes the air through the filter medium, and discharges the purified air to the outside. Therefore, it is preferable that the air filter is airtightly disposed at a predetermined position on the air flow path inside the air purifier so that the taken-in air reliably passes through the filter medium.

[0003] Conventionally, mounting structures for mounting an air filter to a casing that houses the air filter are known (Patent Documents 1 and 2). In the mounting structure of Patent Document 1, mounting is performed by screwing a bolt into a fixing bracket and a bolt receiving part that are arranged in the space between the outer frame of the air filter and a side wall part of the casing that faces the outer frame of the air filter housed in the casing. In the mounting structure of Patent Document 2, a pressing plate and a bolt receiving part are arranged in adjacent spaces of a plurality of spaces separated by horizontal and vertical plates so that a plurality of air filters can be housed in a lattice pattern along a plane perpendicular to the airflow direction, and mounting is performed by screwing a bolt. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2009-95811 A [Patent Document 2] JP 2010-149092 A Summary of the Invention [Problem to be solved by the invention]

[0005] In order to reduce the space required for arranging the air purifier, it is desirable for the air purifier to be compact, while it is desirable for the air purifier to have a large processing air volume. However, in order to increase the processing air volume, a large air filter equipped with a filter material with a large filtering area is generally used, so there are conflicting demands for making the air purifier compact and increasing the processing air volume. In the mounting structure described in Patent Documents 1 and 2, bolts and metal fittings are arranged around the outer frame of the air filter, and a working space is required to tighten the bolts with tools or by hand, so there is a limit to designing a compact air purifier using a large-sized air filter.

[0006] SUMMARY OF THE PRESENT DISCLOSURE In view of the above, an object of the present invention is to provide an air filter mounting structure and an air purifier that can reduce the space around the outer frame of an air filter housed within a casing. [Means for solving the problem]

[0007] One aspect of the present invention is an air filter mounting structure. A mounting structure for mounting an air filter having a filter medium surrounded by an outer frame to a casing, A bolt that presses the outer frame of the air filter accommodated in an accommodation section of the casing, which is configured to move and accommodate the air filter to a first side in an air flow direction in which gas passes through the filter medium, against the first side in the air flow direction; a first locking member disposed on a second side in the airflow direction opposite to the first side with respect to the air filter accommodated in the accommodation section, the first locking member having a bolt receiving portion into which the bolt is screwed, and a locking portion extending from the bolt receiving portion to a side of a wall portion of the accommodation section surrounding the outer frame so as to face the outer frame, and further extending to the first side in the airflow direction and having a tip portion; a second locking member provided at a position of the wall portion opposite to a position on the circumference of the outer frame at which the first locking member is arranged, the second locking member having an opening for receiving the locking portion so as to be inserted through the locking portion, and a support portion for supporting the tip end of the locking portion inserted through the opening, on a first side of the opening in the air flow direction; The opening is characterized in that it opens so as to prevent the engaging portion inserted into the opening from slipping out of the opening to the second side in the air flow direction, while the bolt is screwed into the bolt receiving portion to press the outer frame in the air flow direction, thereby separating the air filter from the bolt receiving portion to the first side in the air flow direction.

[0008] the engaging portion has a first portion extending from the bolt receiving portion toward the wall portion, and a second portion bending from an end portion of the first portion toward the wall portion and extending toward the first side in the air flow direction, It is preferable that the length of the opening in the air flow direction is shorter than the length of the second portion in the air flow direction.

[0009] the engaging portion has a first portion extending from the bolt receiving portion toward the wall portion, and a second portion bending from an end portion of the first portion toward the wall portion and extending toward the first side in the air flow direction, It is preferable that the distance between the opening and the wall is three times or less the length of the second portion along the extension direction of the first portion.

[0010] It is preferable that the second engaging member further includes an abutment portion on a first side of the support portion in the air flow direction, the abutment portion having a narrower distance from the wall portion so as to prevent movement of the tip portion toward the first side in the air flow direction.

[0011] It is preferable that the abutment portion extends at an incline with respect to the air flow direction so that a distance between the second engaging member and the wall portion becomes narrower toward a first side in the air flow direction.

[0012] It is preferable that the length of the opening in a direction parallel to the circumferential extension of the outer frame is longer than the length in that direction of the part of the engaging portion inserted into the opening, and is not more than 110% of that length.

[0013] Another aspect of the present invention is an air purifier. The air purifier comprises: an air filter having a filter medium surrounded by an outer frame; A casing having a storage section configured to move and store the air filter in an airflow direction in which gas passes through the filter material; The mounting structure is characterized by comprising: Effect of the Invention

[0014] According to the above aspect, it is possible to reduce the space around the outer frame of the air filter housed in the casing. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a front view showing an example of an air purifier. [Diagram 2] FIG. 2 is an internal configuration diagram showing an air filter mounting structure with a part of the air purifier removed. [Diagram 3] FIG. [Figure 4] FIG. 2 is a diagram showing the mounting structure in an attached state. [Diagram 5] FIG. 2 is a diagram showing the mounting structure in an attached state. [Figure 6] FIG. 2 is a diagram showing the mounting structure in an attached state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The air filter mounting structure and the air purifier according to the present embodiment will be described below.

[0017] Fig. 1 is a front view showing an example of an air purifier 1 according to the present embodiment. Fig. 2 is an internal configuration diagram showing an attachment structure 10 for an air filter 2 of the air purifier 1 with an upper rear cover (not shown) removed.

[0018] The air purifier 1 includes an air filter 2, a casing 3, and an attachment structure 10. In Fig. 2, the air filter 2 is omitted from the illustration.

[0019] (Air filter) The air filter 2 includes an outer frame 2b (see FIGS. 4 to 6) and a filter medium 2a (see FIGS. 4 and 5) surrounded by the outer frame 2b.

[0020] The outer frame 2b has a rectangular shape when viewed in the airflow direction (hereinafter simply referred to as the airflow direction) X in which air passes through the filter medium 2a of the air filter 2, and surrounds the filter medium 2a. The outer frame 2b is made by combining a plurality of plate materials so that they are arranged at positions corresponding to each of the four sides. The plate materials are, for example, aluminum or aluminum alloy, stainless steel, or ceramic.

[0021] The filter material 2a is a member that collects fine particles such as dust particles in the gas. The filter material 2a is, for example, a fibrous body made of glass fiber, silica fiber, or a mixture of these fibers, and has the form of, for example, nonwoven fabric, paper, cotton, or a mat. Specific examples of the filter material 2a include glass nonwoven fabric, glass filter paper, glass wool, etc., which are made of glass fiber. The filter material 2a may further contain a binder that bonds the fibers together. In order to ensure a filtering area, the filter material 2a is preferably pleated and has a zigzag shape in which mountain folds and valley folds are alternately repeated. This increases the amount of air that can be processed, and the filter material 2a can have a long life.

[0022] The air filter 2 has the performance of, for example, a HEPA (High Efficiency Particulate Air) filter. A HEPA filter is a filter that has a collection efficiency of 99.97% or more for particles with a particle diameter of 0.3 μm at a rated air volume and an initial pressure loss of 245 Pa or less.

[0023] (Casing) 1 and 2, an exhaust port 2c is formed in an upper part of the front side portion of the casing 3, and an intake port 2d is formed in a lower part of the rear side portion of the casing 3. A punching metal 6 is provided on the front side of the casing 3 so as to close the exhaust port 2c from the inside of the casing 3. A pre-filter 8 is provided on the rear side of the casing 3 so as to cover the intake port 2d from the outside of the casing 3.

[0024] When the rear upper cover (not shown) is attached to the casing 3, a flow path for flowing the air taken in from the intake port 2d toward the exhaust port 2c is formed in the air purifier 1. The casing 3 has a storage section 4 that constitutes a part of the flow path. The storage section 4 shown in FIG. 2 is formed at a position adjacent to the upstream side (second side) of the exhaust port 2c in the airflow direction X. The storage section 4 is a section that stores the air filter 2. The storage section 4 is configured so that the air filter 2 can be moved in the airflow direction X and stored therein. Specifically, the storage section 4 has a rectangular wall section 4a that circumferentially surrounds the outer frame 2b so as to face an end face of the outer frame 2b of the air filter 2 stored in the storage section 4.

[0025] A gasket (not shown) is preferably disposed on the upstream side of the edge of the casing 3 surrounding the exhaust port 2c in the airflow direction X. When the air filter 2 is attached to the casing 3 in an attached state (hereinafter also simply referred to as the attached state), the gasket is sandwiched between the air filter 2 and the edge, thereby ensuring that air discharged from the exhaust port 2c passes through the air filter 2.

[0026] (Mounting structure) Fig. 3 is an exploded perspective view showing the mounting structure 10. Figs. 4 to 6 are views showing the mounting structure in an attached state. The mounting structure 10 is a structure for airtightly mounting the air filter 2 housed in the housing section 4 to the casing 3. As shown in Fig. 2, the air purifier 1 has the mounting structures 10 arranged at a total of six locations along the wall section 4a of the housing section 4. In the following explanation, the mounting structure 10 surrounded by the dashed circle in Fig. 2 will be used as an example among these six mounting structures 10, but the mounting structures 10 are configured similarly to one another except for the arrangement positions and the facing direction of the first and second locking members described later. Figs. 4 to 6 show the mounting structure 10 surrounded by the dashed circle in Fig. 2.

[0027] The mounting structure 10 includes a bolt 13 , a first locking member 11 , and a second locking member 12 .

[0028] The bolt 13 is a member that presses the outer frame 2b of the air filter 2 housed in the housing portion 4 of the casing 3 in the airflow direction X. The bolt 13 is arranged to extend in a direction parallel to the airflow direction X. For example, the bolt 13 has a thread nominal size (JIS B1180:2014) of M8 or M10.

[0029] The first locking member 11 is disposed upstream of the air filter 2 housed in the housing portion 4 in the airflow direction X. The first locking member 11 has a bolt receiving portion 11a and a locking portion 11b.

[0030] The bolt receiving portion 11a is a portion in which a screw hole into which the bolt 13 is screwed is formed.

[0031] The locking portion 11b extends from the bolt receiving portion 11a toward the wall portion 4a of the storage portion 4 (the lower right side in the Y direction in FIG. 3), and further extends toward the downstream side (first side) in the airflow direction X, and has a tip portion 11e. The locking portion 11b has a first portion 11c and a second portion 11d. The first portion 11c is a portion that extends from the bolt receiving portion 11a toward the wall portion 4a (the lower right side in the Y direction in FIG. 3). The second portion 11d is a portion that extends from the end of the first portion 11c on the wall portion 4a side toward the downstream side in the airflow direction X so as to bend relative to the first portion 11c.

[0032] In the example shown in FIG. 3, such a first locking member 11 has an L-shape in a cross section perpendicular to the Z direction.

[0033] The second locking member 12 is a member provided at a position on the wall portion 4a that faces the circumferential position of the outer frame 2b at which the first locking member 11 is disposed. The second locking member 12 has an opening, a support portion 12b, and an attachment base portion 12d.

[0034] The opening is a portion where an opening 12a is formed to receive the locking portion 11b so as to be inserted into the locking portion 11b. Therefore, the length W12a in the Z direction of the opening 12a is longer than the length W11c in the Z direction of the locking portion 11b of the first locking member 11.

[0035] The support portion 12b is a portion that supports the tip portion 11e of the locking portion 11b inserted into the opening, on the downstream side of the opening in the airflow direction X. In the attached state, the tip portion 11e is supported by the support portion 12b from the left side in the Y direction, for example, as shown in FIG.

[0036] The mounting base 12d is a portion that is fixed to the wall portion 4a in order to mount the second locking member 12 to the wall portion 4a. Specifically, the mounting base 12d is fixed to the wall surface facing the inner periphery of the wall portion 4a by welding or fastening with screws or the like.

[0037] In order to reduce the space between the outer frame 2b of the air filter 2 and the wall portion 4a of the storage section 4, it is preferable that the first locking member 11 and the second locking member 12 are obtained by bending a plate-shaped member having a certain thickness, as shown in FIG. 3.

[0038] The opening is opened so as to prevent the locking portion 11b inserted through the opening from slipping off to the upstream side in the airflow direction X from the opening, while the bolt 13 is screwed into the bolt receiving portion 11a to press the outer frame 2b in the airflow direction X, thereby separating the air filter 2 from the bolt receiving portion 11a to the downstream side in the airflow direction X. Specifically, in order to prevent the locking portion 11b from slipping off, the opening has an opening 12a closed on the upstream side in the airflow direction X as shown in Fig. 3. Meanwhile, the length L12a of the opening 12a in the airflow direction X is greater than the length (thickness) in the airflow direction X of the first portion 11c of the locking portion 11b so that the locking portion 11b can move in the airflow direction X during the installation work.

[0039] When the air filter 2 is attached using such an attachment structure 10, first, as shown in FIG. 2, the air filter 2 is moved downstream in the airflow direction X and accommodated in the accommodation section 4 with the rear upper cover (not shown) removed from the air purifier 1. Next, the locking portion 11b of the first locking member 11 is inserted from the tip portion 11e through the opening 12a of the second locking member 12, and the first locking member 11 is positioned so that the extension direction of the second portion 11d of the locking portion 11b is parallel to the opening and the support portion 12b of the second locking member 12. In this state, when the bolt 13 is screwed (tightened) into the screw hole of the bolt receiving section 11a, the first portion 11c of the locking portion 11b moves, for example, from the downstream side to the upstream side in the airflow direction X within the opening 12a, and the first portion 11c is separated from the outer frame 2b of the air filter 2. When the bolt 13 is subsequently tightened, the first portion 11c comes into contact with the upstream edge that defines the opening 12a, and the first locking member 11 exerts a force to press the air filter 2 downstream while restricting movement toward the upstream side. In this state, by further tightening the bolt 13, the air filter 2 is strongly pressed toward the exhaust port 2c, and is attached to the casing 3 (hereinafter also referred to as the attached state). As a result, the air filter 2 is airtightly arranged at a predetermined position on the air flow path in the air purifier 1 so that air taken into the casing 3 and discharged from the exhaust port 2c passes through the air filter 2 without fail.

[0040] On the other hand, when removing the installed air filter 2 from the casing 3, the force applied to the air filter 2 by the first locking member 11 is weakened by loosening the bolts 13, and further, the first portion 11c located within the opening 12a is allowed to move freely in the airflow direction X, whereby the locking portion 11b can be pulled out of the opening 12a and the first locking member 11 can be removed from the second locking member 12. By removing the first locking member 11 in this manner, the air filter 2 can be removed by moving it so as to be pulled out toward the upstream side in the airflow direction X from the housing portion 4, and the air filter 2 can be replaced.

[0041] According to the mounting structure 10 of this embodiment, the air filter 2 is attached using the bolts 13, so that the air filter 2 appears to be tightly fastened when the rear upper cover (not shown) is removed as shown in FIG. 2. On the other hand, the bolts 13 are arranged to press the outer frame 2b of the air filter 2, and no bolts are arranged in the space between the outer frame 2b and the wall 4a. Therefore, no space is required between the outer frame 2b and the wall 4a to arrange the bolts or to perform the work of fastening the bolts, and the space around the outer frame 2b of the air filter 2 housed in the casing 3 can be reduced. This allows the arrangement space of the air filter 2 in the casing 3 to be reduced, and the air purifier 1 to be made compact. In addition, as described above, the space around the outer frame 2b of the air filter 2 can be reduced, so that a large air filter 2 with a large filtration area can be arranged. In other words, the air purifier 1 can be made compact and the processing air volume can be improved at the same time.

[0042] According to one embodiment, the length L12a (see FIG. 3) of the opening 12a in the airflow direction X is preferably shorter than the length L11d (see FIG. 3) of the second portion 11d in the airflow direction X. This allows the tip portion 11e of the first locking member 11 to be reliably supported by the support portion 12b of the second locking member 12, as shown in FIG. 4. Furthermore, when the length L12a of the opening 12a is short, the tip portion 11e of the second portion 11d of the first locking member 11 comes into contact with the second locking member 12, making it easier to fix the first locking member 11, and thus improving the work efficiency of attaching the air filter 2. From this point of view, the length L12a is preferably 60 to 90% of the length L11d.

[0043] According to one embodiment, the gap G (see FIG. 3) between the opening and the wall 4a is preferably three times or less the length (thickness) T11d (see FIG. 3) of the second portion 11d along the extending direction Y of the first portion 11c. Such a configuration contributes to reducing the space between the outer frame 2b of the air filter 2 and the wall 4a of the housing 4. Furthermore, since the gap G is narrow, the tip 11e of the first locking member 11 is easily supported not only by the support portion 12b of the second locking member 12 but also by the wall 3a of the casing 3, and the posture of the first locking member 11 is easily stabilized. From this point of view, the gap G is preferably 1.8 to 2.2 times the length (thickness) T11d.

[0044] According to one embodiment, the second locking member 12 preferably further includes an abutment portion 12c, further downstream in the airflow direction X from the support portion 12b, with a narrower distance from the wall portion 4a so as to prevent the tip portion 11e from moving downstream in the airflow direction X. According to this embodiment, when performing the installation work, the tip portion 11e of the first locking member 11 can be abutted against the abutment portion 12c, and the first portion 11c of the locking portion 11b can be disposed at a certain distance from the outer frame 2b of the air filter 2. Therefore, the first locking member 11 into which the bolt 13 has been screwed in beforehand can be used for fastening, and the amount of screwing of the bolt 13 can be reduced.

[0045] In this embodiment, it is further preferable that the abutment portion 12c extends at an incline with respect to the airflow direction X so that the distance between the second locking member 12 and the wall portion 4a narrows toward the downstream side of the airflow direction X. This makes it easier for the tip portion 11e to be restrained from both sides of the second locking member 12 and the wall portion 4a, and makes it easier to stabilize the posture of the first locking member 11 during the installation work.

[0046] According to one embodiment, the length W12a (see FIG. 3) of the opening 12a in a direction parallel to the circumferential extension direction of the outer frame 2b (direction Z in FIGS. 4 to 6) is longer than the length W11c (see FIG. 3) of the portion of the locking portion 11b inserted into the opening in the direction, and is preferably 110% or less of the length W11c. According to this embodiment, the locking portion 11b is restrained from both sides in the parallel direction (Z direction), so that the wobbling of the first locking member 11 during the installation work is suppressed, and the installation work is made easier. In addition, by providing the above-mentioned embodiment in which the abutting portion 12c narrows toward the downstream side in the airflow direction X, the first locking member 11 is supported from various directions, and the wobbling of the first locking member 11 during the installation work is effectively suppressed. Therefore, the efficiency of the installation work of the air filter 2 is greatly improved.

[0047] The air purifier 1 further includes an operation unit 7 (see FIG. 1), a fan (not shown), a power plug (not shown), and legs (see FIG. 1).

[0048] The operation unit 7 is disposed on a surface (front surface) facing the front side of the casing 3. The operation unit 7 is provided with buttons for instructing the air purifier 1 to start and stop operation, and the like.

[0049] The fan is disposed in the lower part of the casing 3, downstream of the airflow direction X of the air intake port 2d. When the operation of the air purifier 1 is instructed by operating the button on the operation unit 7, the fan is driven to rotate, whereby air is taken in through the air intake port 2d, and an airflow that flows toward the exhaust port 2c is formed.

[0050] The power plug is for supplying external power to the air purifier 1.

[0051] The legs are configured to allow the air purifier 1 to stand upright. Specifically, the legs have a shape that extends linearly toward the rear and front of the page of Fig. 1 of the casing 3, and are attached to both ends of the lower end of the casing 3 in the left-right direction of Fig. 1. In the example shown in Fig. 1, casters are provided at both ends of the legs in the extending direction. The legs are not shown in Fig. 2.

[0052] The application of the mounting structure 10 is not limited to the air purifier 1. The mounting structure 10 may be for mounting the air filter 2 to a casing 3 having a housing portion 4, which is installed in the middle of a duct constituting an air conditioning system of a building such as a building or a factory.

[0053] The above provides a detailed explanation of the air filter mounting structure and air purifier of the present invention. However, the air filter mounting structure and air purifier of the present invention are not limited to the above-described embodiments, and various improvements and modifications may be made without departing from the spirit and scope of the present invention.

[0054] Regarding the second side and the first side in the airflow direction, in the above embodiment, the first side is the downstream side and the second side is the upstream side, but in one embodiment, the first side may be the upstream side and the second side may be the downstream side. In this case, the air purifier 1 is configured so that the exhaust port 2c is the intake port and the intake port 2d is the intake port, and an airflow is formed from the intake port to the exhaust port. In the air purifier 1 configured in this manner, the above-mentioned prefilter may be omitted, and instead, a prefilter may be provided between the punching metal 6 and the air filter 2 housed in the housing 4. [Explanation of symbols]

[0055] 1. Air purifier 2. Air Filter 2a Filter media 2b Outer frame 2c Exhaust port 2d Air Intake 3. Casing 4. Storage section 4a wall 6. Punching metal 7 Control section 8 Pre-filter 10. Mounting structure 11 First locking member 11a Bolt receiving part 11b Locking part 11c First Part 11d. Second Part 11e Tip 12 Second locking member 12a opening 12b Support part 12c Contact part 12d Mounting base 13 Volts

Claims

1. A mounting structure for mounting an air filter having a filter medium surrounded by an outer frame to a casing, A bolt that presses the outer frame of the air filter accommodated in an accommodation section of the casing, which is configured to move and accommodate the air filter to a first side in an air flow direction in which gas passes through the filter medium, against the first side in the air flow direction; a first engaging member disposed on a second side in the air flow direction opposite to the first side with respect to the air filter accommodated in the accommodating section, the first engaging member having a bolt receiving portion into which the bolt is screwed, and an engaging portion extending from the bolt receiving portion to a side of a wall portion of the accommodating section surrounding the outer frame so as to face the outer frame, and further extending to the first side in the air flow direction and having a tip portion; a second locking member provided at a position of the wall portion opposite to a position on the circumference of the outer frame at which the first locking member is arranged, the second locking member having an opening for receiving the locking portion so as to be inserted through the locking portion, and a support portion for supporting the tip end of the locking portion inserted through the opening, on a first side of the opening in the air flow direction; the opening is opened so that the locking portion inserted into the opening is prevented from slipping out of the opening to a second side in the air flow direction, while the bolt is screwed into the bolt receiving portion to press the outer frame in the air flow direction, thereby separating the air filter from the bolt receiving portion to a first side in the air flow direction, the engaging portion has a first portion extending from the bolt receiving portion toward the wall portion, and a second portion bending from an end portion of the first portion toward the wall portion and extending toward a first side in the air flow direction, An air filter mounting structure, comprising: a length of the opening in the air flow direction that is shorter than a length of the second portion in the air flow direction.

2. the engaging portion has a first portion extending from the bolt receiving portion toward the wall portion, and a second portion bending from an end portion of the first portion toward the wall portion and extending toward a first side in the air flow direction, 2. The air filter mounting structure according to claim 1, wherein a distance between the opening and the wall portion is equal to or less than three times a length of the second portion along an extension direction of the first portion.

3. 3. An air filter mounting structure as described in claim 1 or 2, wherein the second engaging member further comprises an abutment portion on a first side of the support portion in the air flow direction, the abutment portion having a narrower distance from the wall portion so as to prevent the tip portion from moving toward the first side in the air flow direction.

4. 4. The air filter mounting structure according to claim 3, wherein the abutting portion extends at an angle with respect to the air flow direction such that a distance between the second engaging member and the wall portion becomes narrower toward a first side in the air flow direction.

5. 2. An air filter mounting structure as described in claim 1, wherein a length of the opening in a direction parallel to the circumferential extension direction of the outer frame is longer than a length in that direction of the portion of the engaging portion inserted into the opening, and is no more than 110% of that length.

6. an air filter having a filter medium surrounded by an outer frame; A casing having a storage section configured to move and store the air filter in an airflow direction in which gas passes through the filter material; An air purifier comprising: the mounting structure according to any one of claims 1 to 5.

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