Filter device and filter unit

Abstract

To provide a filter device that is used in a non-horizontal position and does not require a power source independent of the lifting and lowering of a filter in order to bring the liftable filter into close contact with an opposing opening. [SOLUTION] When the frame body 11 continues to rise above a predetermined height close to the use position due to the wire 13 being wound up, the shaft body 83 comes into contact with the top wall 53, preventing it from rising. This causes the shaft body 83 to be pushed down relative to the frame body 11. As a result, the lever member 85 rotates, and the rolling element 101 is pushed rearward from the frame body 11, causing the rolling element 101 to come into contact with and press against the rear wall 45 of the unit case 25. Receiving a reaction force from the rear wall 45, the rolling element 101 presses the frame body 11 toward the opening in the front wall 41 of the unit case 25, causing the gasket 33 of the filter unit 9 to tightly contact the rear surface 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 to a filter unit that is incorporated into the filter device. [Background technology]

[0002] Filter devices are installed to filter air at the entrance or midway of air flow paths for ventilation, exhaust, air conditioning, air humidification, etc. Such filter devices are generally installed in locations that are difficult to reach without using a stepladder or the like, such as high on the exterior walls of buildings, in the ceiling space inside buildings, or high on indoor walls. It is tiring for users or workers to climb up to the filter device using a stepladder or the like to install, remove, clean, replace, etc. the filter. For this reason, filter devices that allow the filter to be raised and lowered electrically or manually are known, as described in Patent Documents 1 to 8.

[0003] When the filter is raised to the usage position, a mechanism is required to press the filter against the opening so that the filter tightly covers the opening through which air flows in or out. If the filter device is used in a horizontal position, the filter can be pressed against the opening by a mechanism that raises the filter (for example, Patent Documents 1 and 2). However, if the filter device is used in a non-horizontal position (for example, Patent Documents 3 to 8), a special pressing mechanism is required. Patent Documents 3 to 8 do not describe such a pressing mechanism.

[0004] Patent Document 6 discloses a filter device that allows the air filter (6) to be raised and lowered, and that, when the air filter (6) is installed (i.e., in use), retains a locking pin (12) on the side of the filter in a locking groove (13) in the filter chamber (7) (see abstract). However, although this mechanism holds the air filter (8) in the installed position, it does not press the air filter (8) to maintain a tight contact state.

[0005] In response to this, Patent Document 7 discloses a filter device "equipped with an elevating mechanism 7 that raises and lowers a 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 at the installation position against the mounting frame 5" (see abstract). However, this filter device "has a controller 9 that controls the elevating motor 20 of the elevating mechanism 7 and the pressing motor 34 of the filter pressing mechanism 8, and is capable of raising the filter 6 from the standby position to the installation position and pressing it against the mounting frame 5, or releasing the pressure of the attached filter 6 against the mounting frame 5 and lowering the filter 6 to the standby position, simply by sending a remote control signal to the controller 9" (see abstract), and the raising and lowering of the filter and the pressing of the attached (i.e., used) filter are achieved by independent power sources, resulting in a complex structure. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6082674 [Patent Document 2] Japanese Patent Application Laid-Open 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 Application Publication No. 2019-063739 [Patent Document 8] Japanese Utility Model Application Publication No. 6-32929 Summary of the Invention [Problem to be solved by the invention]

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

[0008] To achieve the above object, 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 abutment members. The filter unit has the filter and a frame that detachably holds the filter. The lifting mechanism raises and lowers the frame between an in-use position where the filter faces the opening and a position below that. The first and second abutment members abut against portions of the filter unit as the frame rises. The filter unit further includes a first moving member and a second moving member. The first moving member is movable in an up-and-down direction relative to the frame body and abuts against and receives pressure from the first abutting member as the frame body rises and reaches the use position. The second moving member is connected to the first moving member and moves to abut against the second abutting member as the first moving member is pressed down relative to the frame body. By receiving pressure from the second abutting member, the second moving member presses the frame body so that the frame body is in close contact with the opening at the use position.

[0009] According to this configuration, the frame body holding the filter can be raised and lowered, making it easy to perform tasks such as attaching, removing, cleaning, and replacing the filter, even when the filter device is installed at a high location. As the frame body rises above a predetermined height, the first abutting member presses the first moving member downward against the frame body, thereby bringing the frame body into close contact with the opening at the use position where the filter faces the opening. Therefore, the filter does not necessarily have to be used in a horizontal position, but may be used in a vertical position, for example. Furthermore, because the frame body is brought into close contact with the opening using the upward movement of the frame body, no separate power source is required to bring the frame body into close contact with the opening, in addition to the power source for raising and lowering the frame body. The term "direction intersecting the main surface" does not necessarily mean "a 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 that is rotatably supported on the frame body and rotatably connected to the first moving member, and as the first moving member is pressed down against the frame body, the tip portion rotates so as to abut against the second abutment member.

[0011] According to this configuration, the second moving member can be easily realized by the 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 has an elastic member that urges the first moving member upward relative to the frame body by elastic restoring force.

[0013] With this configuration, the second moving member can be prevented from being interfered with by the second abutment member while the frame is moving up and down. Note that the elastic member may directly act on the second moving member, and in that case, it still biases the first moving member.

[0014] A fourth aspect of the present invention is 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 abutment member at a portion that abuts against the second abutment portion.

[0015] According to this configuration, the frictional force applied to the second moving member by the second contact member while the frame body is moving up and down is kept low by the rotation of the rolling elements.

[0016] According to a fifth aspect of the present invention, in the filter device according to any one of the first to fourth aspects, the lifting mechanism has a wire, a winding shaft, a rotating shaft, and a rotation transmission mechanism. The wire suspends the frame. The winding shaft winds and unwinds the wire. The rotating shaft can be rotated from outside the filter device. The rotation transmission mechanism transmits rotation imparted to the rotating shaft to rotation of the winding shaft.

[0017] With this configuration, even if the filter device is installed at a high place, the frame can be raised and lowered by rotating the rotation shaft using, for example, a long rotary tool, and 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, in the filter device according to the fifth aspect, the rotation transmission mechanism includes a worm gear having a worm and a worm wheel. The worm is connected to the rotation 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 winding shaft from moving backward without providing a separate stopping mechanism.

[0020] A seventh aspect of the present invention is a filter unit used as the filter unit included in the filter device according to any one of the first to sixth aspects, and includes a filter, a frame, a first moving member, and a second moving member. The frame detachably holds the filter. The first moving member is movable in an up-and-down direction relative to the frame, and abuts against and is pressed by the first abutting member as the frame rises and reaches the use position. The second moving member is connected to the first moving member, and as the first moving member is pressed down relative to the frame, moves to abut against the second abutting member and is pressed by the second abutting member, pressing the frame so that the frame fits tightly against the opening at the use position.

[0021] According to this configuration, it is possible to configure the filter device according to any one of the first to sixth aspects.

[0022] According to an eighth aspect of the present invention, in the filter unit according to the seventh aspect, the second moving member has a lever member that is rotatably supported by the frame body and rotatably connected to the first moving member, and as the first moving member is pressed down relative to the frame body, the lever member rotates so that its tip abuts against the second abutment member.

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

[0024] As described above, according to the present invention, a filter device that is used in a non-horizontal position and that can be raised and lowered to fit closely to opposing openings is realized, without requiring a power source independent of the filter raising and lowering. Also, a filter unit that can constitute the filter device is realized. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a perspective view illustrating an example of the appearance of a filter device according to an embodiment of the present invention; [Figure 2] 2 is a perspective view illustrating an example of the internal configuration of the filter device of FIG. 1. FIG. [Figure 3] 2 is a partially cutaway perspective view illustrating the configuration of a unit case of the filter device of FIG. 1. FIG. [Figure 4] 2 is a side cross-sectional view illustrating the configuration of a unit case and a filter unit of the filter device of FIG. 1, illustrating the state when the frame of the filter unit is in a state immediately before completion of lifting. FIG. [Figure 5] 2 is a rear view illustrating the configuration of a filter unit included in the filter device of FIG. 1. FIG. [Figure 6] 2 is a side cross-sectional view illustrating the configuration of a unit case and a filter unit of the filter device of FIG. 1, illustrating the state when the frame of the filter unit has completed raising and is in the use position. FIG. [Figure 7] FIG. 10 is a rear view showing another example of the configuration of the filter unit. [Figure 8] FIG. 10 is a side cross-sectional view showing yet another example of the configuration of the filter unit, illustrating the state when the frame of the filter unit has completed raising and is in the use position. [Figure 9] FIG. 10 is a side cross-sectional view showing yet another example of the configuration of the filter unit, illustrating the state when the frame of the filter unit has completed raising and is in the use position. DETAILED DESCRIPTION OF THE INVENTION

[0026] 1 is a perspective view illustrating the appearance of a filter device according to one embodiment of the present invention. As an example, this filter device 1001 is installed midway through ducts (air ducts) 1 and 3, which are air passages installed near the ceiling of a building for ventilation purposes, etc. Filter device 1001 filters air passing through ducts 1 and 3 using a built-in filter 5.

[0027] The illustrated filter device 1001 has a filter chamber 7, a filter unit 9, and an elevator mechanism 10. The filter chamber 7 is box-shaped and is connected to ducts 1 and 3, thereby communicating their internal spaces with each other. Air that enters through duct 1 passes through the filter chamber 7 and exits to duct 3 without leaking to the outside. The filter unit 9 has a frame 11 and a filter 5 that is detachably held by the frame 11.

[0028] The lifting mechanism 10 is a mechanical part that is installed in the filter chamber 7 and that lifts and lowers the frame 11. The frame 11 can be raised and lowered between a use position in the filter chamber 7 and a pulled-down position. The lifting mechanism 10 suspends the frame 11 by a wire 13, and lifts and lowers the frame 11 by winding up and unwinding the wire 13. The wire 13 may be made of, for example, twisted thin stainless steel wires.

[0029] A ring-shaped portion 17 is connected to the lower end of the rotary shaft 15 of the lifting mechanism 13, and the ring-shaped portion 17 is exposed to the outside of the filter chamber 7. For example, an operator can rotate the rotary shaft 15 by hooking a hook-shaped portion 21 provided at the tip of a manual handle 19 onto the ring-shaped portion 17 and rotating a 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 location, an operator can easily perform tasks such as attaching, removing, cleaning, and replacing the filter 5 by simply pulling down the frame 11. For example, by replacing the handle 23 with a handy electric screwdriver (not shown), the frame 11 can be raised and lowered electrically.

[0030] 2 is a perspective view illustrating the internal configuration of filter device 1001. A unit case 25 is installed inside filter chamber 7 to accommodate filter unit 9 so that it can slide vertically and hold it in an in-use position. Unit case 25 is a type of container with an opening in the air passage, and receives and houses filter unit 9 from below. Another duct 27 is installed inside filter chamber 7 to connect duct 1 and unit case 25, for guiding air that has passed through duct 1 to filter 5 of filter unit 9 housed in unit case 25.

[0031] The frame 11 of the filter unit 9 has a substantially rectangular annular portion 29, and the filter 5 is attached to cover the hollow portion. The frame 11 further has a flange-like protruding base 31 that is connected to the bottom of the annular portion 29. A gasket 33 is disposed on the surface of the annular portion 29 that faces the duct 27 (the front surface). Similarly, a gasket 35 is disposed on the upper surface of the base 31. These gaskets 33, 35 ensure close contact between the frame 11 and the unit case 25, thereby allowing the air flowing in from the duct 1 to pass through the filter 5 without leakage, and allowing the air that has passed through the filter 5 to reach the duct 3 without leakage.

[0032] FIG. 3 is a partially cutaway perspective view illustrating the configuration of the unit case 25. The illustrated unit case 25 has a substantially rectangular annular portion 37 that matches the shape of the frame 11 (see FIG. 2) to be housed therein, and a base portion 39 connected to the lower portion of the annular portion 37. An opening 43 serving as an air passage is formed in a front wall 41 of the annular portion 37 to which the duct 27 is connected. Similarly, an opening 47 serving as an air passage is also formed in a rear wall 45 located behind the front wall 41. The annular portion 37 further has side walls 49 and 51 and a top wall 53. The top wall 53 has a through-hole 54 through which the wire 13 passes. The frame 11 is housed in the annular portion 37 while being surrounded by the front wall 41, rear wall 45, side walls 49 and 51, and top wall 53, thereby restricting its position.

[0033] The space surrounded by the annular portion 37 is in communication with the space surrounded by the base portion 39. The base portion 39 has a top 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 and 63 connected to the top wall 55. The bottom surface of the base portion 39 is open all the way 64 to receive the frame 11. A sloping wall is formed at the joint between the lower end of the annular portion 37 and the top wall 55 of the base portion 39, so that the opening widens as it extends downward, in order to guide the frame 11 as it rises. When the frame 11 is raised and housed in the unit case 25 and is in the use position, the gasket 33 of the filter unit 9 comes into close contact with the back surface of the front wall 41 of the annular portion 37, and the gasket 35 comes into close contact with the bottom surface of the top wall 55 of the base portion 39.

[0034] The base 39 further has an outwardly projecting flange 65 that is connected to the lower ends of the front wall 57, rear wall 59, and side walls 61, 63. The flange 65 is fastened to the periphery of an opening 69 formed in a bottom wall 67 of the filter chamber 7. The unit case 25 is thereby erected on the bottom wall 67 of the filter chamber 7. The position of the opening 69 is determined so that the bottom surface of the base 39, which has an open entire surface 64, and the opening 69 in the bottom wall 67 of the filter chamber 7 overlap with each other so that the unit case 25 can receive the filter unit 9. The position of the unit case 25 is determined by the position of the end of the duct 27 to be connected.

[0035] When the filter device 1001 is in use, the filter unit 9 is held in the use position within the unit case 25. At this time, the filter 5 held in the frame 11 of the filter unit 9 faces, in a vertical position, the opening 43 in the front wall 41 of the annular portion 37 to which the duct 27 is connected. The filter 5 filters and passes air flowing in through the opening 43. As already described, to ensure that the air flowing in from the opening 43 passes through the filter 5 without leakage, the gasket 33 of the filter unit 9 is tightly attached to the back surface of the front wall 41 of the annular portion 37. To achieve this tight attachment, the filter unit 9 is provided with a pressing mechanism that presses the frame 11 against the front wall 41 of the annular portion 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 FIG. 2, the lifting mechanism 10 installed in the filter chamber 7 has, in addition to the wire 13 and the rotary shaft 15, a winding shaft 71 that winds up and unwinds the wire 13. The winding shaft 71 is supported in a horizontal position and rotatably by a bearing (not shown) installed in the wall of the filter chamber 7. The winding shaft 71 has a bobbin 73 that regulates the axial position of the wire 13 that is wound up. The wire 13 is suspended from the bobbin 73 and is wound around 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 in a vertical position and rotatably by bearings (not shown) installed on the wall of the filter chamber 7 outside 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 the worm 77 form a worm gear, which functions as a rotation transmission mechanism 79 that transmits the rotation imparted to the rotating shaft 15 by the manual handle 19 or the like to the rotation of the winding shaft 71. Using a worm gear for the rotation transmission mechanism 79 has the advantage that the winding shaft 71 is prevented from moving backward without the need for a separate stopping mechanism.

[0038] Fig. 4 is a side cross-sectional view illustrating the configuration of unit case 25 and filter unit 9, illustrating the state when frame 11 of filter unit 9 is in a state immediately before completion of lift. Fig. 5 is a rear view illustrating the configuration of filter unit 9. In the illustrated example, filter 5 is detachably held by a filter holding member 81 of frame 11. Filter holding member 81 is recessed to the rear so as to receive filter 5 from an opening on the front of frame 11 facing duct 27, and supports filter 5 from the rear so that filter 5 can resist the pressure of air sent from duct 27.

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

[0040] The lever member 85 is rotatably supported at its center by one of the spacers 89 that fasten the shaft support member 91 to the side wall 87. This supported portion serves as a fulcrum 95 of the lever member 85. The base end of the lever member 85 is further connected to the shaft body 83 so as to rotate as the shaft body 83 moves. A through hole 97 extending in one direction is provided at the base end of the lever member 85. A pin 99 installed on the shaft body 83 is inserted into the through hole 97, causing the lever member 85 to rotate as the shaft body 83 moves. The extension direction of the through hole 97 is set to a direction away from or approaching the fulcrum 95. As a result, the lever member 85 can rotate around the fulcrum 95 as the pin 99 moves in the axial direction of the shaft body 83 without preventing the distance between the pin 99 and the fulcrum 95 from changing. A rolling element 101 is rotatably supported at the tip of the lever member 85 .

[0041] The upper end of the shaft 83 passes through a through-hole 105 provided in the top wall 103 of the frame 11 and is exposed above the top wall 103. A flange 107 extending radially is connected to the top of the shaft 83. In the illustrated example, the top wall 103 has a recess 109, and the through-hole 105 is provided in the bottom of the recess 109. A compression coil spring 111 is disposed between the bottom of the recess 109 and the flange 107. Therefore, the shaft 83 is urged upward by the elastic restoring force of the compression coil spring 111. As a result, in the illustrated example, the rolling element 101 of the lever member 85 is in a retracted position where it does not extend rearward beyond 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 lifting of the frame 11.

[0042] 6 is a side cross-sectional view illustrating the configuration of unit case 25 and filter unit 9, illustrating the state when frame 11 of filter unit 9 has completed its ascent and is in the use position. When wire 13 is wound around bobbin 73, frame 11 rises to a predetermined height relative to unit case 25, and flange 107 at the top of shaft 83 abuts against top wall 53 of unit case 25. Top wall 53 corresponds to a specific example of a "first abutment member" of the present invention.

[0043] Even if the frame body 11 continues to rise above a predetermined height as the wire 13 is further wound up, the shaft body 83 is prevented from rising by the top wall 53. Therefore, as the frame body 11 rises further, the shaft body 83 is pushed down relative to the frame body 11. As a result, the lever member 85 rotates, and the rolling element 101 is pushed rearward from the frame body 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 a specific example of a "second abutment member" of the present invention.

[0044] The rolling elements 101 receive a reaction force (reaction) from the rear wall 45 and press the frame body 11 toward the opening 43 (see FIG. 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 tightly contact the back surface of the front wall 41 of the annular portion 37. In other words, the frame body 11 and the filter 5 tightly contact and cover the opening 43. After coming into contact with the rear wall 45, the rolling elements 101 can roll on the surface of the rear wall 45, thereby reducing the frictional force from the rear wall 45 that prevents the lever member 85 from rotating as the frame body 11 rises.

[0045] When the frame 11 is raised to the use position, the gasket 35 on the upper surface of the base 31 of the filter unit 9 comes into tight contact with the bottom surface of the upper wall 55 of the base 39 of the unit case 25. As a result, even if an attempt is made to rotate the rotary shaft 15 using the manual handle 19 (see FIG. 1 ), the frame 11 is prevented from rising. In this way, when the frame 11 is in the use position, tight contact is maintained between the frame 11 and the opening 43, and between the frame 11 and the filter chamber 7. As already mentioned, a worm gear is used in the rotation transmission mechanism 79, so tight contact is not lost even without a special stopping mechanism.

[0046] When the frame 11 needs to be lowered from the use position for maintenance of the filter 5 or the like, as already mentioned, the operator only needs to use the manual handle 19 or the like to rotate the winding shaft 71 in the opposite direction to that used for winding, and no other operation is required. As a result of the winding shaft 71 rotating in the opposite direction, the wire 13 is unwound from the bobbin 73, and the frame 11 is lowered by 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 body 11 against the front wall 41 of the annular portion 37. As is clear from the above description, the pressing mechanism uses the upward movement of the frame body 11 to press the frame body 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 body 11.

[0048] (Other embodiments) 7 is a rear view showing another example of the configuration of filter unit 9. In order to make it easier to hold frame body 11 in the use position for a long period of time, a certain degree of tensile elasticity may be imparted to the force with which wire 13 pulls frame body 11. In the illustrated example, a tension spring 115 is connected to the connection between wire 13 and frame body 11.

[0049] The filter device 1001 has a pressing mechanism including a shaft 83, a shaft support member 91, and a lever member 85 (see FIGS. 3 and 6). However, it is also possible to use other members to configure a pressing mechanism that does not require a power source independent of the lifting mechanism 10. FIGS. 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 lift and is in the use position.

[0050] In the embodiment shown in Fig. 8, a pair of link members 117 rotatably connected to each other is used instead of the lever member 85 (see Fig. 6). The shaft body 83 is supported by the shaft support member 91 so as to be movable in the axial direction, as in the embodiment shown in Fig. 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 which is 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 body 11 rises, the shaft body 83 is pressed down relative to the frame body 11, causing the pair of link members 117 to bend more sharply. As a result, the rolling element 101 supported at the connecting portion of the pair of link members 117 comes into contact with the rear wall 45 of the unit case 25 and presses against the rear wall 45. In this configuration, the shaft body 83 corresponds to a specific example of a "first moving member" of the present invention, and the pair of link members 117 correspond to a specific example of a "second moving member" of the present invention.

[0052] In the embodiment illustrated in FIG. 9, an elastically bending elastic beam 121 is used instead of the pair of link members 117 illustrated in FIG. 8. The upper end of the elastic beam 121 is rotatably supported by the shaft 83. The lower end is rotatably supported by a support member 119. When the shaft 83 is pressed down against the frame 11 as the frame 11 rises, the elastic beam 121 bends with a smaller radius of curvature. As a result, the center of the elastic beam 121 abuts against the rear wall 45 of the unit case 25 and presses against the rear wall 45. In this embodiment, the shaft 83 corresponds to a specific example of a "first moving member" of the present invention, and the elastic beam 121 corresponds to a specific example of a "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 portion, 19 manual handle, 21 hook-shaped portion, 23 handle, 25 unit case, 27 duct, 29 annular portion, 31 base portion, 33,35 gasket, 37 annular portion, 39 base portion, 41 front wall, 43 opening, 45 rear wall (second abutment member), 47 opening, 49,51 side wall, 53 top wall (first abutment member), 54 through hole, 55 top wall, 57 front wall, 59 rear wall, 61,63 side wall, 64 entire 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 fulcrum, 97 through hole, 99 pin, 101 rolling element, 103 top wall, 105 through hole, 107 flange, 109 recessed portion, 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 chamber through which air passes; an opening provided in the chamber through which the air flows in or out; a filter unit including: a filter that faces the opening and filters the air that flows in or out; a frame that detachably holds the filter; and a movable member that is installed on the frame and has first and second contact portions, and that converts movement of the first contact portion relative to the frame in a direction in which the frame moves along the opening into movement of the second contact portion that moves toward or away from the opening; an elevating mechanism that is installed in the chamber and that elevates the frame between a use position where the filter faces the opening and a position below the chamber; first and second abutment members disposed within the chamber; the first abutment member abuts against the first abutment portion and pushes it down when the frame body rises to the use position, thereby moving the second abutment portion away from the opening, The second abutment member abuts against the second abutment portion that moves away from the opening, and by applying a reaction force, presses the frame body so that the frame body is in close contact with the opening in the use position.

2. the movable member includes a motion member having the first contact portion and a lever member having the second contact portion, The filter device described in claim 1, wherein the lever member is rotatably supported on the frame body and rotatably connected to the moving member, and the second abutment portion rotates so as to abut against the second abutment member as the moving member is pressed down against the frame body.

3. The filter device according to claim 1 , wherein the filter unit further includes an elastic member that urges the movable member in a direction in which the second contact portion approaches the opening by means of an elastic restoring force.

4. The filter device according to claim 1 , wherein the movable member has a rolling element that abuts against the second abutment member at the second abutment portion.

5. The lifting mechanism includes: A wire for suspending the frame; a winding shaft for winding and unwinding the wire; a rotation shaft that can be rotated from the outside of the filter device; The filter device according to claim 1 , further comprising: a rotation transmission mechanism that transmits the rotation imparted to the rotation shaft to the rotation of the winding shaft.

6. The rotation transmission mechanism includes: a worm connected to the rotary shaft; 6. The filter device of claim 5, further comprising a worm gear having a worm wheel coupled to the winding shaft.

7. A filter unit used as the filter unit included in the filter device according to claim 1, a filter facing the opening for filtering the air flowing in or out; a frame that detachably holds the filter; a movable member that is installed on the frame body, has first and second contact portions, and converts movement of the first contact portion relative to the frame body in a direction in which the frame body moves along the opening into movement of the second contact portion moving toward or away from the opening, the first abutment portion is pressed down by contacting the first abutment member when the frame body is raised to the use position, and thereby the second abutment portion moves away from the opening; The second abutment portion, which moves away from the opening, abuts against the second abutment member and receives a reaction force, thereby pressing the frame body tightly against the opening in the use position.

8. 8. The filter unit according to claim 7, the movable member includes a motion member having the first contact portion and a lever member having the second contact portion, A filter unit in which the lever member is rotatably supported on the frame body and rotatably connected to the moving member, and as the moving member is pressed down against the frame body, the second abutment portion rotates so as to abut against the second abutment member.

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