air purifier

Abstract

An air purifier (100) comprises a base part (3) and a first filter (FL1). The base part (3) has an intake port (31) through which air is taken in. The first filter (FL1) is disposed downstream of the base part (3) along the flow of the air. The first filter (FL1) includes a cleaning part (90) which cleans the air and a filter frame body (91) to which the cleaning part (90) is mounted. The base part (3) includes a protruding part (32) which protrudes toward the filter frame body (91). The protruding part (32) is opposite from the filter frame body (91).

Description

Technical Field

[0004] ,

[0006] , , , , , ,

[0005] , , , , ,

[0001] The present invention relates to an air purifier.

Background Art

[0002] The air purifier described in Patent Document 1 includes a housing perpendicular to the ground, an air inlet, an air outlet, a fan, and two filter units 21. The air inlet is installed at the bottom of the housing. The air outlet is installed at the apex of the housing. The fan installed below the housing sucks air from the lower air inlet, and the air travels upward through the vertical air passage inside the vertically extending housing and blows out from the upper air outlet. A large amount of dust floating at a high concentration near the ground is effectively sucked under the housing, inhaled into the housing, and filtered by the replaceable filter units installed inside the housing. The two filter units are arranged at intervals in the vertical direction at the lowermost part of the housing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the air purifier described in Patent Document 1, if the filter unit is not properly installed, for example, the filter unit may fall off during operation and the air purification may not be effectively performed.

[0005] An object of the present invention is to provide an air purifier capable of suppressing the filter from falling off.

Means for Solving the Problems

[0006] According to one aspect of the present invention, an air purifier comprises a base and a first filter. The base has an intake port into which air is drawn. The first filter is positioned downstream of the base in the airflow. The first filter includes a purification unit for purifying the air and a filter frame to which the purification unit is attached. The base includes a projection that protrudes toward the filter frame. The projection faces the filter frame. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide an air purifier that can suppress the detachment of the filter. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view showing an air purifier according to an embodiment of the present invention. [Figure 2] This is a cross-sectional view showing an air purifier according to this embodiment. [Figure 3A] This is a side view showing the protruding portion and the erected portion according to this embodiment. [Figure 3B] This is a plan view showing the protruding portion and the erected portion according to this embodiment. [Figure 4A] This is a plan view showing the first filter body according to this embodiment. [Figure 4B] Figure 4A is a cross-sectional view along the IVB-IVB line. [Figure 5] This is a perspective view showing the filter holding member and filter unit according to this embodiment. [Figure 6] This is a side view showing the filter holding member according to this embodiment. [Figure 7] This is a perspective view showing the base portion according to this embodiment. [Figure 8A] This is a side view showing a modified example of the protrusion according to this embodiment. [Figure 8B] This is a plan view showing a modified example of the protrusion according to this embodiment. [Figure 9]This is a perspective view showing the filter unit according to this embodiment. [Figure 10] This is an exploded perspective view showing the filter unit according to this embodiment. [Figure 11] This is a plan view showing the filter unit according to this embodiment. [Figure 12] This is a perspective view showing an enlarged portion of the second filter body according to this embodiment. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or corresponding parts will be denoted by the same reference numerals and will not be repeated in the description. Also, for the sake of explanation, a three-dimensional Cartesian coordinate system (X, Y, Z) is shown in the drawings as appropriate. In the drawings, the X and Y axes are parallel to the horizontal direction, and the Z axis is parallel to the vertical direction.

[0010] An air purifier 100 according to an embodiment of the present invention will be described with reference to Figures 1 to 12. First, the air purifier 100 will be described with reference to Figure 1. In the following description, the axial direction AD, circumferential direction CD, and radial direction RD of the air purifier 100 will be used with respect to the central axis AX. The axial direction AD indicates the direction along the central axis AX and is substantially parallel to the central axis AX. In the example of Figure 1, the axial direction AD is substantially parallel to the vertical direction, and the circumferential direction CD and radial direction RD are substantially parallel to the horizontal direction. The axial direction AD is substantially perpendicular to the radial direction RD. The radial direction RD can take any direction within 360 degrees around the central axis AX, as long as it is substantially perpendicular to the central axis AX. Viewing an object from the axial direction AD will be described as a plan view.

[0011] Figure 1 shows an air purifier 100 according to this embodiment. As shown in Figure 1, the air purifier 100 has, for example, a substantially cylindrical shape. Specifically, the air purifier 100 comprises a housing 1, a base portion 3, a support member 5, an upper structure 7, and an operation panel 9.

[0012] The housing 1 has, for example, a substantially cylindrical shape. The material of the housing 1 is, for example, a synthetic resin. The synthetic resin is, for example, an ABS resin (acrylonitrile, butadiene, styrene copolymer synthetic resin). The upper structure 7 is disposed inside the upper side of the housing 1. The operation panel 9 is disposed on the upper surface of the upper structure 7. The operation panel 9 receives inputs for operating the air cleaner 100 and notifies the state of the air cleaner 100. The operation panel 9 includes, for example, push switches and indicator lights.

[0013] Also, the air cleaner 100 has an air outlet 11 for blowing out air. The air outlet 11 is disposed at the upper part of the air cleaner 100. Specifically, the air outlet 11 surrounds the upper structure 7 in the circumferential direction CD at the upper part of the housing 1.

[0014] The base portion 3 is disposed at the lower part of the air cleaner 100. Specifically, the base portion 3 is disposed at the lower part of the housing 1. The base portion 3 has, for example, a substantially bottomed cylindrical shape. The material of the base portion 3 is, for example, a synthetic resin (for example, an ABS resin).

[0015] The base portion 3 has a plurality of suction ports 31. Air is sucked in from each suction port 31. That is, air is introduced into the interior of the air cleaner 100 from each suction port 31. The plurality of suction ports 31 are disposed on the circumferential surface of the base portion 3 along the circumferential direction CD. Therefore, according to the present embodiment, air can be effectively introduced into the interior of the air cleaner 100 from four directions below the air cleaner 100.

[0016] The support member 5 supports the base portion 3 from below the base portion 3. The support member 5 has, for example, a substantially disc shape.

[0017] FIG. 2 is a cross-sectional view showing the air cleaner 100. As shown in FIG. 2, the air cleaner 100 further includes a fan 13, an ion generator 15, a cover member 17, a filter unit FL, and a filter holding member CS. The housing 1 houses the fan 13, the ion generator 15, the cover member 17, the filter unit FL, and the filter holding member CS.

[0018] The fan 13 draws in outside air AR from each intake port 31. Then, the fan 13 blows out the air AR, which has had dust collected by the filter FL, from the outlet port 11 to the outside of the air purifier 100. The fan 13 is a centrifugal fan. Specifically, the fan 13 includes a motor 130 and an impeller 131. The motor 130 rotates the impeller 131 around the central axis AX. The impeller 131 has multiple blades.

[0019] The cover member 17 covers the fan 13 from above. The cover member 17 has a plurality of ventilation holes 171 for allowing air AR to pass through.

[0020] The ion generator 15 generates ions. As a result, the air AR that has passed through the filter section FL contains ions. The fan 13 then blows out the ion-containing air AR from the outlet 11. The air AR can also be disinfected by the ions. The ion generator 15 is positioned between the fan 13 and the filter section FL. That is, the ion generator 15 is positioned downstream of the air AR flow from the filter section FL. The ion generator 15 generates, for example, positive ions and / or negative ions. The ion generator 15 includes, for example, a discharge electrode and a power supply circuit.

[0021] The filter unit FL purifies the air AR. The filter unit FL is positioned between the fan 13 and the base unit 3. In other words, the filter unit FL is positioned downstream of the base unit 3 in the air AR flow.

[0022] Specifically, the filter section FL includes a first filter FL1 and a filter unit FL2. The first filter FL1 can be considered a pre-filter.

[0023] The filter unit FL2 purifies the air AR. In this embodiment, the filter unit FL2 collects dust contained in the air AR. The filter unit FL2 is positioned downstream of the base unit 3 in the flow of the air AR.

[0024] Specifically, the filter unit FL2 includes a second filter 60 and a frame 80.

[0025] The second filter 60 purifies the air AR. In this embodiment, the second filter 60 collects dust contained in the air AR passing through the second filter 60. The function of the second filter 60 is not particularly limited as long as it purifies the air AR. The second filter 60 is positioned downstream of the base portion 3 in the flow of air AR. The second filter 60 is positioned downstream of the first filter FL1 in the flow of air AR. The frame 80 surrounds the second filter 60 while contacting it. Details of the second filter 60 and the frame 80 will be described later.

[0026] The first filter FL1 purifies the air AR. In this embodiment, the first filter FL1 collects dust contained in the air AR passing through the first filter FL1. The function of the first filter FL1 is not particularly limited as long as it purifies the air AR. For example, the first filter FL1 may be a deodorizing filter that removes odors. The first filter FL1 is positioned downstream of the base unit 3 in the flow of air AR. The first filter FL1 is positioned upstream of the second filter 60 in the flow of air AR. In other words, the first filter FL1 is positioned below the second filter 60. Details of the first filter FL1 will be described later.

[0027] The filter holding member CS holds the filter unit FL2. The filter holding member CS is located inside the housing 1. The filter holding member CS has, for example, a roughly covered rectangular tube shape. Specifically, the filter holding member CS includes a frame member 40 and a cover member 41. The frame member 40 surrounds the second filter 60 in the circumferential direction CD. The frame member 40 has, for example, a roughly rectangular tube shape. The cover member 41 covers the second filter 60. The cover member 41 has a plurality of vents 191a for allowing air AR to pass through.

[0028] The frame 80 is positioned in the gap between the filter holding member CS (specifically the frame member 40) and the second filter 60, and seals the gap. Therefore, according to this embodiment, it is possible to suppress the inflow of dust-containing air into the housing 1 through the gap between the filter holding member CS and the second filter 60. In particular, in this embodiment, the frame 80 is elastic. Therefore, it can effectively seal the gap between the filter holding member CS and the second filter 60. Preferably, the material of the frame 80 is a porous material. A porous material is, for example, a sponge. According to this preferred example, the gap between the filter holding member CS and the second filter 60 can be sealed even more effectively.

[0029] The base portion 3 includes a base body 30 and a protruding portion 32. Preferably, the base portion 3 further includes a plurality of upright portions 33. For example, the base body 30, the protruding portion 32, and the plurality of upright portions 33 are integrally molded.

[0030] The base body 30 has, for example, a roughly bottomed cylindrical shape. Multiple suction ports 31 are arranged on the base body 30. Multiple upright sections 33 are erected from the base body 30.

[0031] The protruding portion 32 extends from the base body 30 toward the first filter FL1. The protruding portion 32 faces the first filter FL1 (specifically the first filter frame 91 in Figure 4A) in the axial direction AD. Therefore, even if the first filter FL1 is not properly installed, the protruding portion 32 supports the first filter FL1, preventing it from falling off during operation. As a result, air AR can be effectively purified. Furthermore, even if the first filter FL1 is not properly installed, the protruding portion 32 supports the first filter FL1, maintaining its position in a nearly fixed location. Therefore, air AR passes through the first filter FL1 appropriately. As a result, air AR can be effectively purified.

[0032] Furthermore, even if the user forgets to place the first filter FL1 and the second filter 60 shifts downward due to its own weight, the second filter 60 is supported by the protrusion 32. Therefore, the second filter 60 is prevented from falling. As a result, the intake port 31 is not blocked by the second filter 60. Thus, according to this embodiment, air AR can be smoothly introduced into the air purifier 100 from each intake port 31. However, if the second filter 60 were to fall, there is a possibility that the intake port 31 could be blocked by the fallen second filter 60.

[0033] Furthermore, even if the first filter FL1 is not properly installed by the user and shifts downward due to its own weight, the first filter FL1 is supported by the protrusion 32. Therefore, the first filter FL1 and the second filter 60 are prevented from falling. As a result, the intake port 31 is prevented from being blocked by the first filter FL1 and the second filter 60. Thus, air AR can be smoothly introduced into the air purifier 100 from each intake port 31. However, if the first filter FL1 falls, there is a possibility that the intake port 31 may be blocked by the fallen first filter FL1. Also, if the first filter FL1 falls, there is a possibility that the second filter 60 may also fall due to its own weight. As a result, there is a possibility that the intake port 31 may be blocked by the fallen first filter FL1 and the second filter 60.

[0034] In particular, in this embodiment, it is preferable that the protrusion 32 protrudes from the central part of the base part 3 (specifically, the base body 30). According to this preferred example, when introducing air AR from each intake port 31 toward the first filter FL1, it is possible to suppress the obstruction of the introduction of air AR to the first filter FL1 by the protrusion 32.

[0035] Furthermore, in this embodiment, the protrusion 32 contacts the first filter FL1 (specifically, the first filter frame 91 in Figure 4A) from below. Therefore, the protrusion 32 can support the first filter FL1 while maintaining its axial position AD. As a result, the detachment of the first filter FL1 can be effectively suppressed.

[0036] Furthermore, in this embodiment, it is preferable that the tip portion 32a of the protrusion 32 includes a convex curved surface toward the first filter FL1. According to this preferred example, physical influence from the protrusion 32 to the first filter FL1 (specifically, the first filter frame 91 in Figure 4A) can be suppressed. Also, even if the user forgets to position the first filter FL1 and the second filter 60 shifts downward and comes into contact with the protrusion 32, physical influence from the protrusion 32 to the second filter 60 can be suppressed.

[0037] Next, the protruding portion 32 and the upright portion 33 will be described with reference to Figures 3A and 3B. Figure 3A is a side view showing the protruding portion 32 and the upright portion 33. Figure 3B is a top view showing the protruding portion 32 and the upright portion 33.

[0038] As shown in Figures 3A and 3B, the projection 32 is positioned on the central axis AX and extends along the axial direction AD. The projection 32 is also roughly columnar in shape. For example, the projection 32 has a roughly cylindrical shape. However, as long as the projection 32 protrudes from the base body 30, the shape of the projection 32 is not particularly limited. For example, the projection 32 may have a roughly frustoconical shape. The number of projections 32 is also not limited to one, but may be two or more. The position of the projections 32 is also not limited, and any arrangement is possible.

[0039] Multiple upright portions 33 are arranged on the circumferential surface of the protruding portion 32 at intervals along the circumferential direction CD. Each of the multiple upright portions 33 widens from its tip towards its base. For example, the upright portions 33 have a roughly triangular shape. In addition, as shown in Figure 3B, in a plan view, each upright portion 33 extends radially outward RD. Furthermore, at least two of the multiple upright portions 33 are non-parallel to each other. Therefore, according to this embodiment, for example, when the second filter 60 has a pleated structure, the following effect is obtained. That is, even if the user forgets to position the first filter FL1 and the protruding portion 32 enters the gap between the peaks of the pleated structure in the second filter 60 that has shifted downward, the non-parallel upright portions 33 can suppress further downward shifting of the second filter 60. This is because the non-parallel upright portions 33 function as stoppers.

[0040] In the example shown in Figure 3B, among the multiple upright sections 33, upright sections 33a and 33b adjacent to each other in the circumferential direction CD are non-parallel to each other. In plan view, upright section 33a is approximately perpendicular to upright section 33b. The number of multiple upright sections 33 is not particularly limited. For example, upright section 33a may be approximately acute or approximately obtuse relative to upright section 33b.

[0041] Next, the first filter FL1 will be described with reference to Figures 4A and 4B. Figure 4A is a plan view showing the first filter FL1. The first filter FL1 is washable.

[0042] As shown in Figure 4A, the first filter FL1 comprises a first filter body 90 and a first filter frame 91. In Figure 4A, the first filter body 90 is shaded to improve readability. The first filter body 90 corresponds to an example of a "purification section". The first filter frame 91 corresponds to an example of a "filter frame".

[0043] The first filter body 90 purifies the air AR that passes through it. In this embodiment, the first filter body 90 collects dust contained in the air AR that passes through it. The first filter body 90 is a sheet that allows air AR to pass through it and is substantially sheet-like. In the example of Figure 4A, the first filter body 90 has a substantially rectangular shape. The material of the first filter body 90 is, for example, a synthetic resin (for example, polyethylene terephthalate (PET)). In this embodiment, the minimum size of dust (particles) that the first filter body 90 can collect is larger than the minimum size of dust (particles) that the second filter 60 (Figure 2) can collect.

[0044] Therefore, the first filter body 90 collects relatively large dust particles. As a result, clogging of the second filter 60, which is located downstream of the first filter body 90, by relatively large dust particles can be suppressed. Consequently, the decrease in the collection efficiency of the second filter 60 can be suppressed compared to when the first filter body 90 is not installed. Because the second filter 60 is located downstream of the first filter body 90, it collects relatively small dust particles.

[0045] Furthermore, as long as the first filter body 90 purifies the air AR, the function of the first filter body 90 is not particularly limited. For example, the first filter body 90 may have a deodorizing function.

[0046] The first filter body 90 is attached to the first filter frame 91. The material of the first filter frame 91 is, for example, synthetic resin (for example, polypropylene (PP)). As an example, the first filter frame 91 includes a roughly rectangular annular frame portion 931, a roughly straight skeletal portion 932, and a roughly straight skeletal portion 933. The skeletal portions 932 and 933 are roughly perpendicular to each other. The skeletal portion 932 extends from one side 90a of the frame portion 931 to the opposite other side 90b. The skeletal portion 933 extends from one side 90c of the frame portion 931 to the opposite other side 90d.

[0047] Figure 4B is a cross-sectional view along the line IVB-IVB in Figure 4A. As shown in Figure 4B, the protrusion 32 faces the first filter frame 91 from below the first filter FL1 in the axial direction AD. The protrusion 32 then contacts the first filter frame 91. In other words, the protrusion 32 contacts the first filter frame 91, not the first filter body 90. Therefore, damage to the first filter body 90 can be prevented.

[0048] Preferably, the projection 32 faces the central portion 934 of the first filter frame 91. The projection 32 then contacts the central portion 934. The central portion 934 is the intersection of the two skeletal portions 932. The central axis AX passes through the central portion 934. The central portion 934 corresponds to an example of an "opposing portion". On the other hand, as explained with reference to Figure 2, preferably, the projection 32 protrudes from the central portion of the base portion 3, and the central axis AX passes through the projection 32. This preferred example has the following effects.

[0049] In other words, for example, when the base portion 3 is attached to the housing 1 (e.g., the filter holding member CS) by screw-type engagement (horizontal rotation), even when the base portion 3 is rotated horizontally around the central axis AX, the position of the protrusion 32 does not change, or hardly changes. This is because the protrusion 32 is positioned on the central axis AX, which is the center of rotation. In other words, the protrusion 32 only rotates without changing its position much. Therefore, the area of ​​the first filter frame 91 can be reduced compared to the case where the position of the protrusion 32 changes with the horizontal rotation of the base portion 3. As a result, the pressure loss of the first filter body 90 can be reduced. The screw-type engagement of the base portion 3 will be described later.

[0050] More preferably, the first filter frame 91 has a recess 935. The recess 935 is located on the lower surface of the central portion 934. The recess 935 is recessed on the upper side of the axial direction AD. The recess 935 has, for example, a substantially bowl shape (substantially curved surface) recessed on the upper side of the axial direction AD. The tip 32a of the projection 32 fits into the recess 935. According to this preferred example, displacement of the projection 32 from the central portion 934 can be suppressed. Therefore, displacement of the projection 32 from the first filter frame 91 and contact with the first filter body 90 can be suppressed.

[0051] As shown in Figures 4A and 4B, the first filter frame 91 further includes a first claw portion 936 and a second claw portion 937.

[0052] The first claw portion 936 protrudes from one side 90c of the frame portion 931 toward the outside of the frame portion 931.

[0053] The second claw portion 937 is positioned on the other side 90d of the frame portion 931. In cross-sectional view, the second claw portion 937 has a substantially U-shape. The second claw portion 937 is elastic. For example, the second claw portion 937 constitutes a leaf spring.

[0054] Next, the filter holding member CS will be described with reference to Figures 5 and 6. Figure 5 is a perspective view showing the filter holding member CS and the filter unit FL2. In Figure 5, diagonal dashed lines are added to the frame 80 for easier viewing.

[0055] As shown in Figure 5, the filter holding member CS holds the filter unit FL2. Details of the filter unit FL2 will be described later.

[0056] The filter holding member CS has a roughly rectangular opening PN. The filter unit FL2 is exposed through the opening PN.

[0057] The filter holding member CS further includes a protruding portion 42, a plurality of wall portions 43, a first engaging portion 44, and a second engaging portion 45. In the example shown in Figure 5, the filter holding member CS includes four wall portions 43.

[0058] The protruding portion 42 is located in the axial direction AD on the opposite side of the cover member 41 (Figure 2) of the filter holding member CS. The protruding portion 42 extends radially outward RD from the lower end of the frame member 40 in the axial direction AD of the filter holding member CS.

[0059] Multiple wall portions 43 are arranged on the protruding portion 42 along the circumferential direction CD. Each wall portion 43 protrudes downward from the protruding portion 42 in the axial direction AD. Each wall portion 43 is also curved along the circumferential direction CD and has a substantially arc shape. Furthermore, a gap 46 is formed between adjacent wall portions 43 along the circumferential direction CD.

[0060] The first engaging portion 44 is positioned on the protruding portion 42. The first engaging portion 44 is positioned radially RD inward relative to the wall portion 43. The first engaging portion 44 protrudes downward in the axial direction AD. The first engaging portion 44 has a hole 44a. The hole 44a is recessed radially RD outward.

[0061] The second engaging portion 45 is positioned on the protruding portion 42. The second engaging portion 45 is positioned radially RD inward relative to the wall portion 43. The second engaging portion 45 is recessed toward the upward direction in the axial direction AD.

[0062] Here, the first claw portion 936 of the first filter FL1, shown in Figures 4A and 4B, engages with the first engaging portion 44. Specifically, the first claw portion 936 of the first filter FL1 is inserted into the hole 44a of the first engaging portion 44. In addition, the second claw portion 937 of the first filter FL1, shown in Figures 4A and 4B, engages with the second engaging portion 45. As a result, the first filter FL1 is mounted on the filter holding member CS. With the first filter FL1 mounted on the filter holding member CS, the four corners of the first filter FL1 are each located in the four gaps 46.

[0063] Furthermore, the filter holding member CS further includes a plurality of engaging portions 47 for attaching the base portion 3 (Figure 1). In the example of Figure 5, the filter holding member CS includes three engaging portions 47. Each engaging portion 47 is located on the wall portion 43. The plurality of engaging portions 47 are arranged, for example, at approximately equal intervals in the circumferential direction CD. Each engaging portion 47 is recessed inward in the radial direction RD.

[0064] Figure 6 is a side view showing the filter holding member CS. As shown in Figure 6, as an example, the engaging portion 47 of the filter holding member CS has a substantially L-shape. Specifically, the engaging portion 47 includes a first recess 470 and a second recess 471. The first recess 470 is recessed from the outer surface of the wall portion 43. The first recess 470 extends upward in the axial direction AD from the lower end of the wall portion 43. The second recess 471 is continuous with the upper end of the first recess 470. The second recess 471 extends along the circumferential direction CD. The second recess 471 is recessed from the outer surface of the wall portion 43.

[0065] Next, with reference to Figure 7, the configuration for attaching the base portion 3 to the filter holding member CS (screw-type engagement configuration) will be described. Figure 7 is a perspective view showing the base portion 3. As shown in Figure 7, the base portion 3 has an opening 30a. The opening 30a is open toward the upper side in the axial direction AD. The opening 30a is approximately circular.

[0066] Furthermore, the base portion 3 further includes a bottom portion 34, a peripheral wall portion 35, a plurality of claw portions 36, and an opening edge portion 30b. In the example shown in Figure 7, the base portion 3 includes three claw portions 36.

[0067] The bottom portion 34 is substantially disc-shaped. The protruding portion 32 protrudes from the center of the base portion 3 at the bottom portion 34. The peripheral wall portion 35 extends along the circumferential direction CD. The peripheral wall portion 35 also extends upward in the axial direction AD from the bottom portion 34. Multiple suction ports 31 are arranged on the peripheral wall portion 35. The opening edge portion 30b is located at the upper end of the peripheral wall portion 35. The opening edge portion 30b forms the edge of the opening 30a and has a substantially annular shape.

[0068] Multiple claw portions 36 are arranged on the opening edge 30b along the circumferential direction CD. For example, the multiple claw portions 36 are arranged at approximately equal intervals along the circumferential direction CD. Each claw portion 36 protrudes radially inward RD from the opening edge 30b.

[0069] The claw portion 36 engages with the engaging portion 47 of the filter holding member CS shown in Figures 5 and 6. As a result, the base portion 3 is attached to the filter holding member CS.

[0070] Specifically, the claw portion 36 is inserted from below into the first recess 470 of the engaging portion 47 in the filter holding member CS shown in Figure 6. Then, when the base portion 3 is rotated in the circumferential direction CD, the claw portion 36 enters the second recess 471. As a result, the base portion 3 is attached to the filter holding member CS.

[0071] Here, we define the first and second states of the base portion 3. The first state of the base portion 3 indicates a state in which the base portion 3 is detachably attached to the housing 1 (Figure 1). Specifically, the first state of the base portion 3 indicates a state in which the base portion 3 is detachably attached to the filter holding member CS. More specifically, the first state of the base portion 3 indicates a state in which the claw portion 36 is inserted (positioned) into the first recess 470 of the engaging portion 47. Therefore, in the first state, the base portion 3 is detachably attached to the housing 1 (specifically, the filter holding member CS).

[0072] The second state of the base portion 3 indicates that the base portion 3 is in a state in which it cannot be detached from the housing 1 (Figure 1). Specifically, the second state of the base portion 3 indicates that the base portion 3 is in a state in which it cannot be detached from the filter holding member CS. More specifically, the second state of the base portion 3 indicates that the claw portion 36 has entered (positioned) into the second recess 471 of the engaging portion 47. In other words, the second state of the base portion 3 indicates that the base portion 3 has rotated approximately horizontally relative to the first state. To put it another way, the second state of the base portion 3 indicates that the base portion 3 has rotated circumferentially in the CD direction relative to the first state. Therefore, in the second state, the base portion 3 is in a state in which it cannot be detached from the housing 1 (specifically, the filter holding member CS).

[0073] Next, a modified example of the protrusion 32 will be described with reference to Figures 8A and 8B. Figure 8A is a side view showing a modified example of the protrusion 32. Figure 8B is a top view showing a modified example of the protrusion 32. Hereinafter, the modified example of the protrusion 32 may be referred to as "protrusion 32A".

[0074] As shown in Figures 8A and 8B, the projection 32A further includes a plurality of protrusions 37. The plurality of protrusions 37 are arranged on the circumferential surface of the projection 32 at the tip side of the projection 32, along the circumferential direction CD. Each protrusion 37 protrudes radially outward RD. Also, as shown in Figure 8B, at least two of the plurality of protrusions 37 are non-parallel to each other. Therefore, according to a modified example, for example, when the second filter 60 has a pleated structure, the following effect is obtained. That is, even if the user forgets to position the first filter FL1 and the projection 32 faces the gap between the peaks of the pleated structure in the second filter 60 that has shifted downward, the non-parallel protrusions 37 can suppress further downward shifting of the second filter 60. This is because the non-parallel protrusions 37 function as stoppers.

[0075] In the example shown in Figure 8B, among the multiple protrusions 37, protrusions 37a and 37b adjacent to each other in the circumferential direction CD are non-parallel to each other. In plan view, protrusion 37a is approximately perpendicular to protrusion 37b. The number of multiple protrusions 37 is not particularly limited. For example, protrusion 37a may be approximately acute or approximately obtuse with respect to protrusion 37b. The base portion 3 does not necessarily have to have an upright portion 33.

[0076] Next, the details of the filter unit FL2 will be described with reference to Figures 9 to 12. Figure 9 is a perspective view showing the filter unit FL2. As shown in Figure 9, the filter unit FL2 includes a second filter 60 and a frame 80. The second filter 60 has a curved, roughly rectangular parallelepiped shape (for example, a curved, roughly cubic shape). In other words, the second filter 60 has a curved, roughly rectangular parallelepiped shape (for example, a curved, roughly cubic shape).

[0077] The second filter 60 includes a pair of first side sections 610, a pair of second side sections 620, an air inlet surface SF1, and an air outlet surface SF2. The first side section 610 is an example of a "side section".

[0078] The pair of first side portions 610 face each other in a direction substantially perpendicular to the axial direction AD. The pair of first side portions 610 extend along the axial direction AD. Of the pair of first side portions 610, at least one first side portion 610 is curved toward the other first side portion 610. In the example of Figure 9, the pair of first side portions 610 are curved toward each other.

[0079] In the description of the second filter 60 in this specification, bending is synonymous with flexing.

[0080] The pair of second side portions 620 face each other in a direction substantially perpendicular to the axial direction AD. The pair of second side portions 620 extend along the axial direction AD. The pair of second side portions 620 are substantially perpendicular to the pair of first side portions 610.

[0081] Air flows into the air inlet surface SF1. The air inlet surface SF1 is approximately perpendicular to the axial direction AD. Furthermore, the air inlet surface SF1 is approximately perpendicular to the first side surface 610 and the second side surface 620.

[0082] Air flows out from the air outlet surface SF2. The air outlet surface SF2 is approximately perpendicular to the axial direction AD. The air outlet surface SF2 is also approximately perpendicular to the first side surface 610 and the second side surface 620. The air outlet surface SF2 faces the air inlet surface SF1 in the axial direction AD.

[0083] The frame 80 is elastic and surrounds the second filter 60 while making surface contact with it. The frame 80 has, for example, a roughly square ring shape. The frame 80 is positioned at the lower end of the second filter 60. Specifically, the frame 80 is positioned at the rear end of the second filter 60 in a predetermined direction DZ. The predetermined direction DZ is roughly parallel to the axial direction AD. Specifically, the predetermined direction DZ indicates the direction from the air inlet surface SF1 to the air outlet surface SF2.

[0084] It is preferable that the width L1 of the frame 80 in a predetermined direction DZ is smaller than the width L2 of the second filter 60 in a predetermined direction DZ. According to this preferred example, the amount of material used for the frame 80 can be reduced compared to the case where the width L1 of the frame 80 and the width L2 of the second filter 60 are equal. Therefore, the cost of the filter unit FL2 can be reduced.

[0085] Specifically, the frame 80 includes a pair of first frame elements 800 and a pair of second frame elements 810. The first frame elements 800 correspond to an example of a "frame element".

[0086] Each pair of first frame elements 800 is positioned corresponding to a pair of first side portions 610. The pair of first frame elements 800 face each other via a second filter 60.

[0087] The first frame element 800 contacts the curved first side portion 610. For example, the first frame element 800 makes surface contact with the curved first side portion 610. Specifically, the inner surface 802 of the first frame element 800 is curved along the curved first side portion 610 and makes contact with the curved first side portion 610. For example, the inner surface 802 of the first frame element 800 makes surface contact with the curved first side portion 610.

[0088] Therefore, according to this embodiment, it is possible to suppress the formation of a gap between the first frame element 800 and the curved first side portion 610. As a result, according to this embodiment, it is possible to suppress the inflow of air containing dust into the interior of the housing 1 (Figure 2) from between the first frame element 800 and the curved first side portion 610.

[0089] In addition, the outer surface 801 of the first frame element 800 extends in a substantially straight line. Therefore, as shown in Figure 5, the outer surface 801 of the first frame element 800 contacts the inner surface 40a of the filter holding member CS (specifically, the frame member 40). For example, the outer surface 801 of the first frame element 800 makes surface contact with the inner surface 40a. The inner surface 40a of the filter holding member CS (specifically, the frame member 40) is a substantially flat surface. Therefore, it is possible to suppress the formation of a gap between the first frame element 800 and the opening PN of the filter holding member CS (specifically, the frame member 40). As a result, according to this embodiment, it is possible to suppress the inflow of air containing dust into the interior of the housing 1 (Figure 2) from between the first frame element 800 and the opening PN of the filter holding member CS (specifically, the frame member 40).

[0090] Returning to Figure 9, the pair of second frame elements 810 are each positioned corresponding to the pair of second side portions 620. The pair of second frame elements 810 face each other via the second filter 60. The pair of second frame elements 810 are substantially perpendicular to the pair of first frame elements 800.

[0091] The second frame element 810 contacts the second side portion 620. For example, the second frame element 810 makes surface contact with the second side portion 620. Specifically, the inner surface 812 of the second frame element 810 is aligned with the second side portion 620 and contacts the second side portion 620. For example, the inner surface 812 of the second frame element 810 makes surface contact with the second side portion 620.

[0092] Therefore, according to this embodiment, it is possible to suppress the formation of a gap between the second frame element 810 and the second side portion 620. As a result, according to this embodiment, it is possible to suppress the inflow of air containing dust into the interior of the housing 1 (Figure 2) from between the second frame element 810 and the second side portion 620.

[0093] In addition, the outer surface 811 of the second frame element 810 extends in a substantially straight line. Therefore, as shown in Figure 5, the outer surface 811 of the second frame element 810 contacts the inner surface 40a of the filter holding member CS (specifically, the frame member 40). For example, the outer surface 811 of the second frame element 810 makes surface contact with the inner surface 40a.

[0094] Therefore, it is possible to suppress the formation of a gap between the second frame element 810 and the opening PN of the filter holding member CS (specifically, the frame member 40). As a result, according to this embodiment, it is possible to suppress the inflow of air containing dust into the interior of the housing 1 (Figure 2) from between the second frame element 810 and the opening PN of the filter holding member CS (specifically, the frame member 40).

[0095] As explained above with reference to Figure 5, the outer surfaces of the frame 80 (a pair of outer surfaces 801 and a pair of outer surfaces 811) come into contact (surface contact) with the inner surface 40a of the filter holding member CS (specifically, the frame member 40), thereby suppressing the inflow of dust-containing air into the housing 1 (Figure 2) from between the frame 80 and the opening PN of the filter holding member CS (specifically, the frame member 40).

[0096] Returning to Figure 9, let's explain the reason why the first side portion 610 of the second filter 60 curves. Specifically, when the frame 80 is attached to the second filter 60, the elasticity of the frame 80 causes the first side portion 610 to curve. For example, when wrapping the frame 80 around the second filter 60, the elasticity of the frame 80 causes the first side portion 610 to curve. The details of the cause will be described later.

[0097] Figure 10 is an exploded perspective view showing the filter unit FL2. Figure 10 shows the second filter 60 before it is curved. As shown in Figure 10, the second filter 60 includes a second filter frame 630 and a second filter body 650. In Figures 9 to 11, dot hatching is applied to the second filter frame 630 for easier viewing of the drawings.

[0098] The second filter frame 630 surrounds the second filter body 650 and holds the second filter body 650. The second filter frame 630 has a roughly rectangular tubular shape. The second filter frame 630 is made of, for example, a nonwoven fabric. The nonwoven fabric contains, for example, multiple types of synthetic resins.

[0099] Specifically, the second filter frame 630 includes a pair of first wall portions 631 and a pair of second wall portions 632. The first wall portions 631 correspond to an example of a "wall portion".

[0100] The pair of first wall portions 631 face each other in a direction substantially perpendicular to the axial direction AD. The pair of first wall portions 631 extend along the axial direction AD. The pair of first wall portions 631 are substantially flat. The first wall portions 631 have substantially flat outer surfaces 631a.

[0101] The pair of second wall portions 632 face each other in a direction substantially perpendicular to the axial direction AD. The pair of second wall portions 632 extend along the axial direction AD. The pair of second wall portions 632 are substantially perpendicular to the pair of first wall portions 631. The pair of second wall portions 632 are substantially flat. The second wall portions 632 have substantially flat outer surfaces 632a.

[0102] The second filter body 650 purifies the air. Therefore, the second filter body 650 can be considered a "purification section". In this embodiment, the second filter body 650 collects dust contained in the air. The second filter body 650 has a pleated structure. For example, the second filter body 650 has a zigzag shape formed by alternately repeating mountain folds and valley folds on a sheet-like filter material. Therefore, the second filter body 650 includes multiple folding elements EL. A pleat line PL1 is visible on the inlet surface SF10 of the second filter body 650. A pleat line PL2 is visible on the outlet surface SF20 of the second filter body 650. Hereinafter, pleat lines PL1 and PL2 will be collectively referred to as pleat line PL.

[0103] The second filter body 650 is, for example, a HEPA (High Efficiency Particulate Air) filter. A HEPA filter is an air filter that has a particle collection efficiency of 99.97% or more for particles with a diameter of 0.3 μm at the rated airflow rate, and an initial pressure loss of 245 Pa or less.

[0104] Specifically, the second filter body 650 includes a pair of first body side sections 651, a pair of second body side sections 652, a body inlet surface SF10, and a body outlet surface SF20. The first body side section 651 is an example of a "body side section".

[0105] The pair of first body side portions 651 face each other in a direction substantially perpendicular to the axial direction AD. The pair of first body side portions 651 extend along the axial direction AD.

[0106] The pair of second body side sections 652 face each other in a direction substantially perpendicular to the axial direction AD. The pair of second body side sections 652 extend along the axial direction AD. The pair of second body side sections 652 are substantially perpendicular to the pair of first body side sections 651.

[0107] Air flows into the main body inlet surface SF10. The main body inlet surface SF10 is approximately perpendicular to the axial direction AD. Furthermore, the main body inlet surface SF10 is approximately perpendicular to the first main body side surface 651 and the second main body side surface 652.

[0108] Air flows out from the main body outlet surface SF20. The main body outlet surface SF20 is approximately perpendicular to the axial direction AD. The main body outlet surface SF20 is also approximately perpendicular to the first main body side surface 651 and the second main body side surface 652. The main body outlet surface SF20 faces the main body inlet surface SF10 in the axial direction AD.

[0109] In the frame 80, the first frame element 800 has an outer surface 801 and an inner surface 802. The second frame element 810 has an outer surface 811 and an inner surface 812.

[0110] Next, we will describe the details of the filter unit FL2 with reference to Figure 11. Figure 11 is a plan view showing the filter unit FL2.

[0111] First, with reference to Figure 11, the details of the cause of the second filter 60 bending will be explained. Specifically, the second filter body 650 has a pleated structure. Therefore, when the frame 80 is attached to the second filter 60, the first wall portion 631 and the first body side portion 651, which are aligned with the direction in which the pleat line PL extends, are prone to bending due to the elasticity of the frame 80. On the other hand, the second wall portion 632 and the second body side portion 652, which are approximately perpendicular to the pleat line PL, are less prone to bending even when the elasticity of the frame 80 is applied.

[0112] The cause of the second filter 60 curvature has been explained above with reference to Figures 9 and 11. However, the cause of curvature is not particularly limited; it is sufficient that the second filter 60 is curved in the filter unit FL2.

[0113] The filter unit FL2 will now be described with reference to Figure 11. In the second filter frame 630, at least one of the pair of first wall portions 631 curves toward the other first wall portion 631. In the example in Figure 11, the pair of first wall portions 631 curve toward each other.

[0114] In the second filter body 650, the first body side portion 651 faces the first wall portion 631. The first body side portion 651 is curved along the curved first wall portion 631. The curved first body side portion 651 extends along the pleat line PL of the second filter body 650. The curved first body side portion 651 is in contact with the curved first wall portion 631. For example, the curved first body side portion 651 is in surface contact with the curved first wall portion 631. Note that in Figure 11, a gap is shown between the first body side portion 651 and the first wall portion 631 for clarity.

[0115] Furthermore, the outer surface 631a of the first wall portion 631 of the second filter frame 630 is in contact with the inner surface 802 of the first frame element 800 of the frame 80. For example, the outer surface 631a is in surface contact with the inner surface 802. Therefore, according to this embodiment, it is possible to suppress the inflow of air containing dust into the housing 1 (Figure 2) from between the frame 80 and the curved second filter frame 630.

[0116] Furthermore, in the second filter body 650, the second body side portion 652 faces the second wall portion 632. The second body side portion 652 is in contact with the second wall portion 632. In a plan view, the second body side portion 652 and the second wall portion 632 extend in a substantially straight line. The second body side portion 652 is in contact with the second wall portion 632.

[0117] Furthermore, the outer surface 632a of the second wall portion 632 of the second filter frame 630 is in contact with the inner surface 812 of the second frame element 810 of the frame 80. For example, the outer surface 632a is in surface contact with the inner surface 812. Therefore, according to this embodiment, it is possible to suppress the inflow of air containing dust into the housing 1 (Figure 2) from between the frame 80 and the second filter frame 630.

[0118] Here, as shown in Figure 11, in the second filter 60, the first wall portion 631 and the first main body side portion 651 constitute a curved first side portion 610. Therefore, the first side portion 610 is curved in a plan view. Also, in the second filter 60, the second wall portion 632 and the second main body side portion 652 constitute a second side portion 620. Therefore, the second side portion 620 extends in a substantially straight line in a plan view.

[0119] Next, the second filter body 650 will be described with reference to Figure 12. Figure 12 is a perspective view showing an enlarged portion of the second filter body 650. In Figure 12, a portion of the inlet surface SF10 of the second filter body 650 is shown in an enlarged view.

[0120] As shown in Figure 12, the second filter body 650 further includes a plurality of spacers 605. The spacers 605 maintain a substantially constant distance between adjacent bent elements EL. The spacers 605 are made of, for example, synthetic resin.

[0121] In particular, in this embodiment, a spacer 605 is also located in the central part AA of the second filter body 650. Therefore, even if the user forgets to place the first filter FL1 (Figure 2) and the second filter 60 shifts downward due to its own weight, the spacer 605 in the central part AA of the second filter body 650 will contact the protruding part 32 (Figure 2). Thus, it is possible to suppress the physical influence of the protruding part 32 on the bending element EL of the second filter body 650.

[0122] Embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the embodiments described above, and can be implemented in various forms without departing from its spirit. Furthermore, the multiple components disclosed in the above embodiments can be modified as appropriate. For example, some components from all the components shown in one embodiment may be added to the components of another embodiment, or some components from all the components shown in one embodiment may be deleted from the embodiment.

[0123] Furthermore, the drawings schematically show each component in order to facilitate understanding of the invention, and the thickness, length, number, spacing, etc. of each component shown may differ from the actual dimensions due to the convenience of drawing creation. Also, the configuration of each component shown in the above embodiments is merely an example and is not particularly limiting, and it goes without saying that various modifications are possible without substantially departing from the effects of the present invention.

[0124] (1) In the embodiment described with reference to Figures 9 and 10, the second side portion 620 of the second filter 60 was substantially straight in plan view. However, the second side portion 620 may be curved, similar to the first side portion 610. In this case, the inner surface 812 of the second frame element 810 of the frame 80 is curved along the second side portion 620. The inner surface 812 is in contact with the second side portion 620. For example, the inner surface 812 is in surface contact with the second side portion 620.

[0125] Specifically, in the second filter 60, the second wall portion 632 of the second filter frame 630 and the second body side portion 652 of the second filter body 650 may be curved in the same way as the first wall portion 631 and the first body side portion 651. In this case, the inner surface 812 of the second frame element 810 of the frame 80 is curved along the second wall portion 632. The inner surface 812 is in contact with the outer surface 632a of the second wall portion 632. For example, the inner surface 812 is in surface contact with the outer surface 632a of the second wall portion 632.

[0126] (2) In the embodiment described with reference to Figures 2 and 4B, the protrusion 32 was in contact with the first filter frame 91 of the first filter FL1. However, the protrusion 32 may be separated from the first filter FL1. In this case, it is possible to suppress the load on the first filter FL1 from the protrusion 32. Specifically, the protrusion 32 protrudes upward in the axial direction AD from the base body 30. The tip 32a of the protrusion 32 is separated from the first filter FL1 in the axial direction AD. In this case, if the first filter FL1 bends downward due to aging, the protrusion 32 may come into contact with the first filter frame 91 of the first filter FL1.

[0127] (3) The present application further discloses the following notes. These notes are not intended to limit the present invention.

[0128] (Note 1) A filter to purify the air, A frame that is elastic and surrounds the filter while in contact with it. Equipped with, The filter includes a pair of side portions that face each other, Of the pair of side portions, at least one side portion is curved toward the other side portion. The frame includes frame elements that contact the curved side portion, The inner surface of the frame element is curved along the curved side portion and in contact with the curved side portion. The outer surface of the frame element is a filter unit that extends in a straight line.

[0129] (Note 2) The filter further includes an air inlet surface into which the air flows and an air outlet surface into which the air flows out. The width of the frame in a predetermined direction is smaller than the width of the filter in the predetermined direction. The predetermined direction refers to the direction from the air inlet surface to the air outlet surface, The frame is positioned at the rear end of the filter in the predetermined direction, and is part of the filter unit as described in Appendix 1.

[0130] (Note 3) The outer surface of the frame element is in contact with the inner surface of a filter holding member that holds the filter unit in an air purifier, as described in Appendix 1 or Appendix 2.

[0131] (Note 4) The material of the frame is a porous material, as described in any one of the appendices 1 to 3.

[0132] (Note 5) The filter has a substantially rectangular parallelepiped shape, The frame is a filter unit according to any one of the appendices 1 to 4, having a substantially square ring shape.

[0133] (Note 6) The aforementioned filter is A purifying unit having a pleated structure and purifying the air, A filter frame surrounds the aforementioned purification section and holds the purification section. Includes, The filter frame includes a pair of walls facing each other, Of the pair of wall sections, at least one wall section curves toward the other wall section. The purification section includes a main body side portion that curves along the curved wall portion, The curved side portion of the main body extends along the pleat line of the purification section, The curved wall portion and the curved side portion of the main body are the filter unit according to any one of the appendices 1 to 5 that constitute the curved side portion. [Industrial applicability]

[0134] This invention provides an air purifier and has industrial applicability. [Explanation of symbols]

[0135] 1 cabinet 3. Base section 30 Base Unit 31 Inlet 32 Protrusion 33. Erecting Section 60. Second filter 80 frame 90. First filter body (purification section) 91. First filter frame (filter frame) 100 Air Purifiers FL1 First Filter FL2 Filter Unit

Claims

1. A base section having an air intake port into which air is drawn in, A first filter positioned downstream of the base portion from the airflow and Equipped with, The first filter is, The aforementioned air purification unit, The filter frame to which the purification unit is attached Includes, The base portion includes a projection that protrudes upward toward the filter frame, The suction port is formed on the side of the base portion, next to the protruding portion. The aforementioned protruding portion is formed in a columnar shape protruding from the central part of the base portion, and its tip faces the filter frame, in this air purifier.

2. The air purifier according to claim 1, wherein the protruding portion is in contact with the filter frame.

3. The aforementioned protruding portion protrudes from the central part of the base portion, The filter frame includes a portion facing the protruding portion, as per claim 1 or claim 2. The air purifier described above.

4. The base portion has a plurality of suction ports, The plurality of suction ports are arranged on the circumferential surface of the base portion, in accordance with claim 3. The air purifier described.

5. The device further comprises a housing for the first filter, The base portion is detachable from the housing in the first state, and inseparable from the housing in the second state. The second state refers to a state in which the base portion is rotated substantially horizontally relative to the first state. The air purifier according to claim 3 or claim 4.

6. The base portion is The base body and Multiple upright parts erected from the base body and It further includes, The plurality of erected portions are arranged on the circumferential surface of the protruding portion at intervals along the circumferential direction. The aforementioned upright portion widens from the tip of the upright portion toward the base end, Claim 1 An air purifier according to any one of claims 5.

7. The tip of the protruding portion includes a convex curved surface toward the first filter, as per claim 1. An air purifier according to any one of claims 6.

8. A second filter is located downstream of the first filter in the airflow and purifies the air. An air purifier according to any one of claims 1 to 7, further comprising a filter.

Images