Filter device and filter unit

Abstract

To provide a filter device that does not require a power source independent of the filter's movement, in order to ensure that a vertically movable filter, used in a non-horizontal position, is in close contact with an opposing opening. [Solution] As the wire 13 is wound up, the frame 11 continues to rise beyond a predetermined height close to the position of use, and the shaft 83 comes into contact with the upper wall 53, preventing it from rising further. As a result, the shaft 83 is pushed down relative to the frame 11. Consequently, the lever member 85 rotates, and the rolling element 101 is pushed out behind the frame 11, causing the rolling element 101 to come into contact with and press against the rear wall 45 of the unit case 25. The rolling element 101 receives a reaction force from the rear wall 45, which pushes the frame 11 toward the opening in the front wall 41 of the unit case 25, causing the gasket 33 of the filter unit 9 to adhere tightly to the back of the front wall 41 of the annular portion 37.

Description

Technical Field

[0001] The present invention relates to a filter device that filters air by having a filter facing an opening through which air flows in or out, and a filter unit incorporated in the filter device.

Background Art

[0002] Filter devices are installed to filter air at the inlet or in the middle of an air flow path for ventilation, exhaust, air conditioning, air humidification, etc. Such filter devices are generally installed at positions that are inaccessible by hand without using a stepladder, etc., such as at a high place on the outer wall of a building, in the ceiling space inside a room, or at a high place on the inner wall surface of a room. It is laborious for a user or worker to climb up to near the filter device using a stepladder, etc. and perform operations such as attaching, detaching, cleaning, and replacing the filter. For this reason, as described in Patent Documents 1 to 8, filter devices that can raise and lower the filter electrically or manually are known.

[0003] When the filter is raised to the use position, in order for the filter to closely cover the opening through which air flows in or out, a mechanism for pressing the filter against the opening is required. In the case of a filter device in which the filter is used in a horizontal posture, the filter can be pressed against the opening by the mechanism for raising the filter (for example, Patent Documents 1 and 2). However, in the case of a filter device in which the filter is used in a non-horizontal posture (for example, Patent Documents 3 to 8), a special pressing mechanism is required. Patent Documents 3 to 6 and 8 do not describe such a pressing mechanism.

[0004] Patent Document 6 discloses a filter device that enables the lifting and lowering of an air filter (6) and, when the air filter (6) is attached (i.e., during use), holds a locking pin (12) on the side surface of the filter in a locking groove (13) of a filter chamber (7) (see the abstract). However, this mechanism does not press the air filter (8) to maintain a close contact state, although it holds the air filter (8) in the attachment position.

[0005] In contrast, Patent Document 7 discloses a filter device comprising "a lifting mechanism 7 that raises and lowers the filter 6 between a standby position below the mounting frame 5 and an installation position within the mounting frame 5, and a filter pressing mechanism 8 that presses the filter 6 in the installation position against the mounting frame 5" (see abstract). However, this filter device is "equipped with a controller 9 that controls the lifting motor 20 of the lifting mechanism 7 and the pressing motor 34 of the filter pressing mechanism 8, and by simply sending a remote operation signal to the controller 9, the filter 6 in the standby position can be raised to the installation position and pressed against the mounting frame 5, or the pressure on the installed filter 6 against the mounting frame 5 can be released and the filter 6 lowered to the standby position" (see abstract). The lifting and lowering of the filter and the pressing of the installed (i.e., in use) filter are realized by independent power sources, which has the problem of being structurally complex. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 6082674 [Patent Document 2] Japanese Patent Publication No. 2013-185755 [Patent Document 3] Patent No. 5327014 [Patent Document 4] Patent No. 4621321 [Patent Document 5] Patent No. 3255569 [Patent Document 6] Patent No. 3134621 [Patent Document 7] Japanese Patent Publication No. 2019-063739 [Patent Document 8] Japanese Utility Model Publication No. 6-32929 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] The present invention has been made in view of the above-mentioned problems, and aims to provide a filter device that does not require a power source independent of the raising and lowering of the filter, in order to bring a vertically movable filter, which is used in a non-horizontal position, into close contact with opposing openings. The present invention also aims to provide a filter unit that can constitute such a filter device. [Means for solving the problem]

[0008] To achieve the above objective, a first aspect of the present invention provides a filter device for filtering air, having a filter facing an opening through which air flows in or out, comprising a filter unit, a lifting mechanism, and first and second contact members. The filter unit includes the filter and a frame that detachably holds the filter. The lifting mechanism raises and lowers the frame between a usage position where the filter faces the opening and a position below it. The first and second contact members contact a part of the filter unit as the frame rises. The filter unit further comprises a first moving member and a second moving member. The first moving member is movable in the vertical direction relative to the frame, and as the frame rises and reaches the usage position, it comes into contact with and is pressed against the first contact member. The second moving member is connected to the first moving member and moves to come into contact with the second contact member as the first moving member is pushed down relative to the frame, and is pressed by the second contact member so that the frame is in close contact with the opening at the usage position.

[0009] With this configuration, since the frame that holds the filter can be raised and lowered, even if the filter device is installed at a high place, operations such as attaching, detaching, cleaning, and replacing the filter can be easily performed. As the frame rises beyond a predetermined height, the first contact member pushes the first moving member downward against the frame, and by utilizing this, the frame is brought into close contact with the opening when the filter is in use facing the opening, so it is not assumed that the filter will be used in a horizontal position, but may be used in a vertical position, for example. Also, since the frame is brought into close contact with the opening by utilizing the upward movement of the frame, an independent power source is not required in addition to the power source for raising and lowering the frame in order to bring the frame into close contact with the opening. Note that "direction intersecting the main surface" is not limited to "direction perpendicular to the main surface".

[0010] A second aspect of the present invention is a filter device according to the first aspect, wherein the second moving member has a lever member, the lever member is rotatably supported by the frame and rotatably connected to the first moving member, and rotates so that its tip contacts the second contact member as the first moving member is pushed down relative to the frame.

[0011] With this configuration, the second moving member can be easily realized by a lever member.

[0012] A third aspect of the present invention is a filter device according to the first or second aspect, wherein the filter unit further comprises an elastic member that biases the first moving member in an upward direction relative to the frame by an elastic restoring force.

[0013] This configuration prevents the second moving member from being interfered with by the second contact member during the process of the frame moving up and down. The elastic member may act directly on the second moving member, but even in that case, it still biases the first moving member.

[0014] According to a fourth aspect of the present invention, there is provided a filter device according to any one of the first to third aspects, wherein the second moving member has a rolling element that abuts against the second abutting member at a portion that abuts against the second abutting portion.

[0015] According to this configuration, in the process of raising and lowering the frame body, the frictional force applied to the second moving member by the second abutting member is suppressed to a low level by the rotation of the rolling element.

[0016] According to a fifth aspect of the present invention, there is provided a filter device according to any one of the first to fourth aspects, wherein the elevating mechanism includes a wire, a winding shaft, a rotating shaft, and a rotation transmission mechanism. The wire suspends the frame body. The winding shaft winds up and rewinds the wire. The rotating shaft can be rotationally driven from the outside of the filter device. The rotation transmission mechanism transmits the rotation applied to the rotating shaft to the rotation of the winding shaft.

[0017] According to this configuration, even if the filter device is installed at a high place, for example, by using a long rotary tool to rotate the rotating shaft, the frame body can be raised and lowered. Therefore, the filter device itself does not require an electric power source such as a motor.

[0018] According to a sixth aspect of the present invention, there is provided a filter device according to the fifth aspect, wherein the rotation transmission mechanism includes a worm gear having a worm and a worm wheel. The worm is connected to the rotating shaft. The worm wheel is connected to the winding shaft.

[0019] According to this configuration, since the transmission mechanism includes a worm gear, it is possible to prevent the reverse rotation of the winding shaft without separately providing a locking mechanism.

[0020] According to a seventh aspect of the present invention, there is provided a filter unit used as the filter unit included in the filter device according to any one of the first to sixth aspects. The filter unit includes a filter, a frame body, a first moving member, and a second moving member. The frame body detachably holds the filter. The first moving member is movable in the lifting direction with respect to the frame body, and abuts against and is pressed by the first abutting member in the process of the frame body rising to reach the use position. The second moving member is connected to the first moving member, and as the first moving member is pushed down with respect to the frame body, the second moving member moves so as to abut against the second abutting member, and by receiving pressure from the second abutting member, the frame body is pressed so as to closely contact the opening at the use position.

[0021] According to this configuration, a filter device according to any one of the first to sixth aspects can be configured.

[0022] According to an eighth aspect of the present invention, there is provided a filter unit according to the seventh aspect, wherein the second moving member has a lever member. The lever member is rotatably supported by the frame body and is rotatably connected to the first moving member. As the first moving member is pushed down with respect to the frame body, the tip end rotates so as to abut against the second abutting member.

[0023] According to this configuration, a filter device according to the second aspect can be configured.

Advantages of the Invention

[0024] As described above, according to the present invention, there is realized a filter device that uses a filter that is used in a non-horizontal posture and can be lifted and lowered, and that does not require a power source independent of the lifting and lowering of the filter in order to closely contact the opposing openings. Further, there is realized a filter unit that can constitute the filter device.

Brief Description of the Drawings

[0025] [Figure 1] It is a perspective view illustrating the appearance of a filter device according to an embodiment of the present invention. [Figure 2] Figure 1 is a perspective view illustrating the internal configuration of the filter device. [Figure 3] Figure 1 is a partially cutaway perspective view illustrating the configuration of the unit case of the filter device. [Figure 4] Figure 1 is a side cross-sectional view illustrating the configuration of the unit case and filter unit of the filter device, showing the state when the frame of the filter unit is just before it has finished rising. [Figure 5] This is a rear view illustrating the configuration of the filter unit in the filter device shown in Figure 1. [Figure 6] Figure 1 is a side cross-sectional view illustrating the configuration of the unit case and filter unit of the filter device, showing the filter unit's frame when it has finished rising and is in the operating position. [Figure 7] This is a rear view showing another example configuration of the filter unit. [Figure 8] This is a side cross-sectional view showing yet another configuration example of the filter unit, illustrating the state when the filter unit frame has completed its upward movement and is in the operational position. [Figure 9] This is a side cross-sectional view showing yet another configuration example of the filter unit, illustrating the state when the filter unit frame has completed its upward movement and is in the operational position. [Modes for carrying out the invention]

[0026] Figure 1 is a perspective view illustrating the external appearance of a filter device according to one embodiment of the present invention. This filter device 1001 is, for example, installed midway through ducts 1 and 3, which are air passages located near the ceiling of a building for purposes such as ventilation. The filter device 1001 filters the air passing through the ducts 1 and 3 using its built-in filter 5.

[0027] The illustrated filter device 1001 includes a filter chamber 7, a filter unit 9, and a lifting mechanism 10. The filter chamber 7 is box-shaped and connected to ducts 1 and 3, so that their internal spaces are in communication with each other. Air entering from duct 1 passes through the filter chamber 7 and exits into duct 3 without leaking to the outside. The filter unit 9 includes a frame 11 and a filter 5 that is detachably held in the frame 11.

[0028] The lifting mechanism 10 is installed in the filter chamber 7 and is the mechanism for raising and lowering the frame 11. The frame 11 can move up and down between a working position within the filter chamber 7 and a lowered position. The lifting mechanism 10 suspends the frame 11 by a wire 13, and raises and lowers the frame 11 by winding up and unwinding the wire 13. For example, the wire 13 is made of twisted thin stainless steel wires.

[0029] A ring-shaped portion 17 is connected to the lower end of the rotating shaft 15 of the lifting mechanism 13, and the ring-shaped portion 17 is exposed to the outside of the filter chamber 7. An operator can rotate the rotating shaft 15 by, for example, hooking the hook-shaped portion 21 provided at the tip of the manual handle 19 onto the ring-shaped portion 17 and rotating the handle 23 provided at the base end. This allows the frame 11 to be raised and lowered. Therefore, even if the filter device 1001 is installed at a high place, an operator can easily perform tasks such as attaching, detaching, cleaning, and replacing the filter 5 by pulling down the frame 11. For example, by replacing the handle 23 with a handy electric screwdriver (not shown), it is also possible to raise and lower the frame 11 electrically.

[0030] Figure 2 is a perspective view illustrating the internal configuration of the filter device 1001. Inside the filter chamber 7, a unit case 25 is erected to house the filter unit 9 in a vertically slidable manner and hold it in the position of use. The unit case 25 is a type of container with an opening for the air passage, receiving and housing the filter unit 9 from below. Another duct 27 is installed inside the filter chamber 7, connecting the duct 1 and the unit case 25, to guide the air that has passed through the duct 1 to the filter 5 of the filter unit 9 housed in the unit case 25.

[0031] The frame 11 of the filter unit 9 has a roughly rectangular annular section 29, and the filter 5 is mounted so as to cover the cavity of this section. The frame 11 further has a base section 31 that is connected to the bottom of the annular section 29 and protrudes in a flange-like manner. A gasket 33 is placed on the side of the annular section 29 that faces the duct 27 (the front). Similarly, a gasket 35 is placed on the upper surface of the base section 31. These gaskets 33 and 35 ensure a tight seal between the frame 11 and the unit case 25, thereby allowing air flowing in from the duct 1 to pass through the filter 5 without leakage, and the air that has passed through the filter 5 to reach the duct 3 without leakage.

[0032] Figure 3 is a partially cutaway perspective view illustrating the configuration of the unit case 25. The illustrated unit case 25 has a roughly rectangular annular section 37 and a base section 39 connected below it, in accordance with the shape of the frame 11 (see Figure 2) that it houses. Of the annular section 37, the front wall 41 to which the duct 27 is connected has an opening 43 that serves as an air passage. Similarly, the rear wall 45 located behind the front wall 41 also has an opening 47 that serves as an air passage. The annular section 37 further has side walls 49, 51 and a top wall 53. The top wall 53 is provided with a through hole 54 through which the wire 13 passes. The frame 11 is housed in the annular section 37 while surrounded by these front wall 41, rear wall 45, side walls 49, 51, and top wall 53, thereby restricting its position.

[0033] The space enclosed by the annular portion 37 is in communication with the space enclosed by the base portion 39. The base portion 39 has an upper wall 55 connected to the lower end of the annular portion 37, and a front wall 57, a rear wall 59, and side walls 61, 63 connected to the upper wall 55. The bottom surface of the base portion 39 is open across its entire surface 64 to receive the frame 11. To guide the rising frame 11, an inclined wall is formed at the joint between the lower end of the annular portion 37 and the upper wall 55 of the base portion 39, with the opening widening towards the bottom. When the frame 11 is lifted and housed in the unit case 25 and in the use position, the gasket 33 of the filter unit 9 is in close contact with the rear surface of the front wall 41 of the annular portion 37, and the gasket 35 is in close contact with the bottom surface of the upper wall 55 of the base portion 39.

[0034] The base portion 39 further has flanges 65 that extend outward and are connected to the lower ends of the front wall 57, rear wall 59, and side walls 61, 63. The flanges 65 are fastened to the periphery of the opening 69 formed in the bottom wall 67 of the filter chamber 7. As a result, the unit case 25 is erected on the bottom wall 67 of the filter chamber 7. The position of the opening 69 is determined such that the bottom surface of the base portion 39, which has an open front 64, and the opening 69 in the bottom wall 67 of the filter chamber 7 overlap each other, so that the unit case 25 can accept the filter unit 9. The position of the unit case 25 is determined by the position of the end of the duct 27 to which it is connected.

[0035] When the filter device 1001 is in use, the filter unit 9 is held in the operating position within the unit case 25. At this time, the filter 5 held by the frame 11 of the filter unit 9 faces the opening 43 in the front wall 41 of the annular section 37 to which the duct 27 is connected, in a vertical position. The filter 5 filters and allows the air flowing in from the opening 43 to pass through. As already mentioned, in order to allow the air flowing in from the opening 43 to pass through the filter 5 without leakage, the gasket 33 of the filter unit 9 is made to be tightly sealed against the back surface of the front wall 41 of the annular section 37. To achieve this tight seal, the filter unit 9 is equipped with a pressing mechanism that presses the frame 11 against the front wall 41 of the annular section 37. As will be described in detail later, the pressing mechanism uses the upward movement of the filter unit 9 to press the frame 11 against the front wall 41.

[0036] Returning to Figure 2, the lifting mechanism 10 installed in the filter chamber 7 includes a wire 13, a rotating shaft 15, and a winding shaft 71 for winding up and unwinding the wire 13. The winding shaft 71 is supported horizontally and rotatably by bearings (not shown) installed on the wall of the filter chamber 7. The winding shaft 71 has a bobbin 73 that regulates the axial position for winding the wire 13. The wire 13 is suspended from the bobbin 73 and wound onto the bobbin 73. In the illustrated example, the end of the winding shaft 71 is exposed to the outside of the filter chamber 7 and is connected to a worm wheel 75.

[0037] In the illustrated example, the rotating shaft 15 is supported vertically and rotatably outside the filter chamber 7 by bearings (not shown) installed on the wall of the filter chamber 7. A worm 77 that meshes with a worm wheel 75 is connected to the upper end of the rotating shaft 15. The worm wheel 75 and worm 77 constitute a worm gear and function as a rotation transmission mechanism 79 that transmits the rotation applied to the rotating shaft 15 by a manual handle 19 or the like to the rotation of the winding shaft 71. By using a worm gear in the rotation transmission mechanism 79, the advantage is obtained that the reverse rotation of the winding shaft 71 is prevented without the need for a separate stopping mechanism.

[0038] Figure 4 is a side cross-sectional view illustrating the configuration of the unit case 25 and the filter unit 9, illustrating the state when the frame 11 of the filter unit 9 is just before it has finished rising. Figure 5 is a rear view illustrating the configuration of the filter unit 9. In the illustrated example, the filter 5 is detachably held by a filter holding member 81 of the frame 11. The filter holding member 81 is set back at the rear so as to receive the filter 5 from the opening at the front of the frame 11 facing the duct 27, and supports the filter 5 from the rear so that the filter 5 can resist the pressure of the air supplied from the duct 27.

[0039] In the illustrated example, the filter unit 9 further includes a shaft 83 supported by a frame 11 so as to be movable in the axial direction, and a lever member 85 rotatably supported by the frame 11. The shaft 83 corresponds to a specific example of the "first moving member" of the present invention. The lever member 85 corresponds to a specific example of the "second moving member" of the present invention. The shaft 83 extends vertically along the main surface of the filter 5 and is supported so as to be movable through a shaft support member 91. The shaft support member 91 is fastened to the side wall 87 of the frame 11 at two locations via spacers 89. The shaft support member 91 is installed at two locations, above and below, for a single shaft 83, and supports the shaft 83 so as to be movable in the axial direction by inserting the shaft 83 through through holes 93 provided in the shaft support member 91.

[0040] The lever member 85 is rotatably supported in its center by one of the spacers 89 for fastening the shaft support member 91 to the side wall 87. This supported portion becomes the fulcrum 95 of the lever member 85. The base end of the lever member 85 is further connected to the shaft 83 so that it rotates in accordance with the movement of the shaft 83. A through hole 97 extending in one direction is provided at the base end of the lever member 85. When a pin 99 installed on the shaft 83 is inserted into the through hole 97, the lever member 85 rotates in accordance with the movement of the shaft 83. The direction in which the through hole 97 extends is set to move away from and towards the fulcrum 95. As a result, the lever member 85 can rotate around the fulcrum 95 without hindering the change in the distance between the pin 99 and the fulcrum 95 as the pin 99 moves in the axial direction of the shaft 83. A rolling element 101 is rotatably supported at the tip of the lever member 85.

[0041] The upper end of the shaft 83 is exposed above the upper wall 103 of the frame 11, passing through a through hole 105 provided in the upper wall 103. A flange 107 that protrudes radially is connected to the top of the shaft 83. In the illustrated example, the upper wall 103 has a recess 109, and the through hole 105 is provided at the bottom of the recess 109. A compression coil spring 111 is positioned between the bottom of the recess 109 and the flange 107. As a result, the shaft 83 is biased upward by the elastic restoring force of the compression coil spring 111. Consequently, in the illustrated example, the rolling element 101 of the lever member 85 is in a retracted position so as not to protrude behind the side wall 87 of the frame 11. This prevents the rolling element 101 from interfering with the rear wall 45 of the unit case 25 and hindering the upward movement of the frame 11.

[0042] Figure 6 is a side cross-sectional view illustrating the configuration of the unit case 25 and the filter unit 9, illustrating the state when the frame 11 of the filter unit 9 has completed its rise and is in the operating position. When the wire 13 is wound onto the bobbin 73, the frame 11 rises to a predetermined height relative to the unit case 25, and the flange 107 at the top of the shaft 83 comes into contact with the upper wall 53 of the unit case 25. The upper wall 53 corresponds to one specific example of the "first contact member" of the present invention.

[0043] As the wire 13 is further wound up, the frame 11 can continue to rise beyond a predetermined height, but the shaft 83 is prevented from rising by the upper wall 53. Therefore, as the frame 11 rises further, the shaft 83 is pushed down relative to the frame 11. As a result, the lever member 85 rotates, and the rolling element 101 is pushed out behind the frame 11, causing the rolling element 101 to come into contact with and press against the rear wall 45 of the unit case 25. The rear wall 45 corresponds to one specific example of the "second contact member" of the present invention.

[0044] The rolling element 101 receives a reaction force (reaction) from the rear wall 45, which presses the frame 11 toward the opening 43 (see Figure 3) in the front wall 41 of the unit case 25 (i.e., toward the front), causing the gasket 33 of the filter unit 9 to adhere tightly to the back surface of the front wall 41 of the annular portion 37. In other words, the frame 11 and the filter 5 adhere tightly and cover the opening 43. Since the rolling element 101 can roll on the surface of the rear wall 45 after contacting it, it reduces the frictional force from the rear wall 45 that would otherwise hinder the rotation of the lever member 85 as the frame 11 rises.

[0045] When the frame 11 rises to its operating position, the gasket 35 on the upper surface of the base portion 31 of the filter unit 9 comes into close contact with the bottom surface of the upper wall 55 of the base portion 39 of the unit case 25. As a result, even if one attempts to rotate the rotating shaft 15 using the manual handle 19 (see Figure 1), the upward movement of the frame 11 is prevented. In this way, at the operating position of the frame 11, the airtightness between the frame 11 and the opening 43, and between the frame 11 and the filter chamber 7 are maintained. As already mentioned, since a worm gear is used in the rotation transmission mechanism 79, the airtightness is not compromised even without a special stopping mechanism.

[0046] When lowering the frame 11 from its operating position for maintenance of the filter 5, as already mentioned, the operator only needs to rotate the winding shaft 71 in the opposite direction to the winding direction using the manual handle 19, etc., and no other operations are required. As a result of the winding shaft 71 rotating in the reverse direction, the wire 13 is unwound from the bobbin 73, and the frame 11 descends due to the weight of the filter unit 9.

[0047] The shaft 83, shaft support member 91, lever member 85, etc. constitute a pressing mechanism that presses the frame 11 against the front wall 41 of the annular portion 37. As is clear from what has already been said, the pressing mechanism uses the upward movement of the frame 11 to press the frame 11 against the front wall 41. In other words, the pressing mechanism does not require a power source independent of the lifting mechanism 10 that raises and lowers the frame 11.

[0048] (Other embodiments) Figure 7 is a rear view showing another configuration example of the filter unit 9. To facilitate the holding of the frame 11 in the operating position over a long period of time, some tensile elasticity may be imparted to the force with which the wire 13 pulls up the frame 11. In the illustrated example, a tension spring 115 is connected to the connection between the wire 13 and the frame 11.

[0049] The filter device 1001 had a shaft 83, a shaft support member 91, and a lever member 85 as a pressing mechanism (see Figures 3 and 6). Alternatively, it is possible to configure a pressing mechanism using other components that does not require a power source independent of the lifting mechanism 10. Figures 8 and 9 are side cross-sectional views showing yet another configuration example of the filter unit 9, illustrating the state when the frame 11 of the filter unit 9 has completed its rise and is in the operating position.

[0050] In the embodiment illustrated in Figure 8, a pair of link members 117, which are rotatably connected to each other, are used instead of the lever member 85 (see Figure 6). The shaft body 83 is supported so as to be movable in the axial direction by a shaft support member 91, similar to the embodiment illustrated in Figure 6. The upper end of the upper piece of the pair of link members 117 is rotatably supported by the shaft body 83. The lower end of the lower piece is rotatably supported by a support member 119 fastened to the side wall 87 of the frame body 11, similar to the shaft support member 91. A rolling element 101 is rotatably supported at the connecting portion of the pair of link members 117.

[0051] As the frame 11 rises, the shaft 83 is pushed down relative to the frame 11, causing the pair of link members 117 to bend more sharply. As a result, the rolling elements 101 supported at the connecting portion of the pair of link members 117 come into contact with and press against the rear wall 45 of the unit case 25. In this configuration, the shaft 83 corresponds to a specific example of the "first moving member" of the present invention, and the pair of link members 117 corresponds to a specific example of the "second moving member" of the present invention.

[0052] In the embodiment illustrated in Figure 9, an elastically curved elastic beam 121 is used instead of the pair of link members 117 illustrated in Figure 8. The upper end of the elastic beam 121 is rotatably supported by the shaft 83. The lower end is rotatably supported by the support member 119. As the frame 11 rises, the shaft 83 is pushed down relative to the frame 11, causing the elastic beam 121 to bend with a smaller radius of curvature. As a result, the central part of the elastic beam 121 contacts and presses against the rear wall 45 of the unit case 25. In this embodiment, the shaft 83 corresponds to a specific example of the "first moving member" of the present invention, and the elastic beam 121 corresponds to a specific example of the "second moving member" of the present invention. [Explanation of Symbols]

[0053] 1,3 Duct, 5 Filter, 7 Filter Chamber, 9 Filter Unit, 10 Lifting Mechanism, 11 Frame, 13 Wire, 15 Rotating Shaft, 17 Ring-shaped Part, 19 Manual Handle, 21 Hook-shaped Part, 23 Handle, 25 Unit Case, 27 Duct, 29 Annular Part, 31 Base Part, 33,35 Gasket, 37 Annular Part, 39 Base Part, 41 Front Wall, 43 Opening, 45 Rear Wall (Second Contact Member), 47 Opening, 49,51 Side Walls, 53 Top Wall (First Contact Member), 54 Through Hole, 55 Top Wall, 57 Front Wall, 59 Rear Wall, 61,63 Side Walls, 64 Front Surface, 65 Flange, 67 Bottom wall, 69 Opening, 71 Winding shaft, 73 Bobbin, 75 Worm wheel, 77 Worm, 79 Rotation transmission mechanism, 81 Filter holding member, 83 Shaft body (first moving member), 85 Lever member (second moving member), 87 Side wall, 89 Spacer, 91 Shaft support member, 93 Through hole, 95 Pivot, 97 Through hole, 99 Pin, 101 Rolling element, 103 Top wall, 105 Through hole, 107 Flange, 109 Recess, 111 Compression coil spring, 115 Tension spring, 117 Link member (second moving member), 119 Support member, 121 Elastic beam, 1001 Filter device.

Claims

1. A filter device that filters air by having a filter facing an opening through which air flows in or out, A filter unit having the filter and a frame that detachably holds the filter, The frame is raised and lowered between a position where the filter faces the opening and a position below it, The frame comprises first and second contact members that come into contact with a part of the filter unit during the process of the frame rising, The aforementioned filter unit is A first moving member that is movable in the vertical direction relative to the frame, and that contacts and is pressed against the first contact member in the process of the frame rising and reaching the usage position, A filter device further comprising: a second moving member connected to the first moving member, which moves to contact the second contact member as the first moving member is pushed down relative to the frame, and which presses the frame so that the frame is in close contact with the opening at the usage position by receiving pressure from the second contact member.

2. The second moving member has a lever member, The filter device according to claim 1, wherein the lever member is rotatably supported by the frame and rotatably connected to the first moving member, and rotates so that its tip contacts the second contact member as the first moving member is pushed down relative to the frame.

3. The filter device according to claim 1, further comprising an elastic member that biases the first moving member in an upward direction relative to the frame by an elastic restoring force.

4. The filter device according to claim 1, wherein the second moving member has rolling elements that contact the second contact member in the portion that contacts the second contact member.

5. The aforementioned lifting mechanism is A wire for suspending the aforementioned frame, A winding shaft for winding up and unwinding the aforementioned wire, A rotating shaft that can be rotated from outside the filter device, The filter device according to claim 1, further comprising a rotation transmission mechanism for transmitting the rotation applied to the rotating shaft to the rotation of the winding shaft.

6. The aforementioned rotational transmission mechanism is A worm connected to the aforementioned rotating shaft, The filter device according to claim 5, comprising a worm gear having a worm wheel connected to the winding shaft.

7. A filter unit used as the filter unit in the filter device described in claim 1, Filters and, A frame that detachably holds the aforementioned filter, A first moving member that is movable in the vertical direction relative to the frame, and that contacts and is pressed against the first contact member in the process of the frame rising and reaching the usage position, A filter unit comprising: a first moving member connected to the first moving member, which moves to contact the second contact member as the first moving member is pushed down relative to the frame, and which presses the frame by receiving pressure from the second contact member so that the frame is in close contact with the opening at the usage position.

8. A filter unit according to claim 7, The second moving member has a lever member, The lever member is rotatably supported by the frame and rotatably connected to the first moving member, and rotates so that its tip contacts the second contact member as the first moving member is pushed down relative to the frame, in a filter unit.

Images