Damper device

Abstract

To provide a damper device capable of reliably preventing a reverse flow of air when a first damper and a second damper are in a closed state.SOLUTION: A damper device 1 includes a ventilation cylinder 11, a rotary shaft 21, a first damper 31, a second damper 41 and a sealing member 51. The ventilation cylinder 11 is formed with an annular protruding part 13 and an extension part 15. The annular protruding part 13 is positioned upstream of the rotary shaft 21, the first damper 31 and the second damper 41 in a circulating direction of air, and annularly extends along an inner peripheral surface 112 of the ventilation cylinder 11. The extension part 15 is positioned upstream of the rotary shaft 21, the first damper 31 and the second damper 41 in the circulating direction of air, and extends in a first direction in parallel with the rotary shaft 21. The sealing member 51 seals a gap between the first damper 31 and the second damper 41, and the annular protruding part 13, and seals a gab between the first damper 31 and the second damper 41, and the extension part 15.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a damper device. [Background technology]

[0002] Patent Document 1 discloses a conventional damper device. This damper device includes a ventilation cylinder, a rotating shaft, a first damper, a second damper, and a sealing member. The ventilation cylinder is formed in a generally elliptical cylindrical shape and extends in the axial direction. A frame is disposed inside the ventilation cylinder. The frame is formed in a generally elliptical annular shape that matches the inner peripheral surface of the ventilation cylinder. The rotating shaft is supported by the frame and extends perpendicular to the axial direction of the ventilation cylinder.

[0003] The first damper and the second damper are each disposed inside the vent cylinder. The first damper and the second damper are displaceable between a closed state in which the vent cylinder is closed and an open state in which the vent cylinder is opened by rotating about a rotation axis. The sealing members are attached to the first damper and the second damper, respectively, and are located inside the vent cylinder.

[0004] In this damper device, the ventilation cylinder is connected to a duct of an air conditioner. In this duct, air flows through the interior of the ventilation cylinder toward the downstream side in the axial direction of the ventilation cylinder when the first damper and the second damper in the damper device are shifted from a closed state to an open state. In this duct, air flows through the interior of the ventilation cylinder toward the downstream side in the axial direction of the ventilation cylinder when the first damper and the second damper in the damper device are shifted to a closed state, preventing air from flowing backward.

[0005] In this damper device, when the first damper and the second damper are displaced between the open state and the closed state, a gap exists between the inner circumferential surface of the ventilation cylinder and the first damper and the second damper so that the first damper and the second damper do not interfere with the ventilation cylinder. In this damper device, when the first damper and the second damper are displaced to the closed state, the sealing member abuts against the frame. In this damper device, the gap between the first damper and the second damper and the frame is thus sealed, making it difficult for air to flow through the gap between the inner circumferential surface and the first damper and the second damper in the closed state. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-180747 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in a configuration in which the first damper and the second damper are displaceable between a closed state and an open state, as in the conventional damper device described above, a gap inevitably exists between the first damper and the second damper to prevent interference between the first damper and the second damper. Therefore, in this type of damper device, air can flow through the gap between the first damper and the second damper even when the first damper and the second damper are in the closed state. As a result, this damper device cannot sufficiently prevent air from flowing back even when the first damper and the second damper are in the closed state.

[0008] The present invention has been made in consideration of the above-mentioned conventional situation, and has as its object to provide a damper device that can reliably prevent backflow of air when the first damper and the second damper are in a closed state. [Means for solving the problem]

[0009] The first damper device of the present invention includes a ventilated cylinder body that extends in an axial direction in a cylindrical shape and through which air can flow in the axial direction; a rotating shaft supported by the ventilation cylinder body and extending in a first direction intersecting the axial direction; a first damper and a second damper that are disposed inside the ventilation cylinder and that can be displaced between a closed state in which the ventilation cylinder is closed and an open state in which the ventilation cylinder is opened by rotating around the rotation axis; a sealing member located inside the ventilation cylinder, The ventilation cylinder has an annular protrusion located upstream of the rotation shaft, the first damper, and the second damper in the air flow direction, protruding from an inner circumferential surface of the ventilation cylinder toward the inside of the ventilation cylinder and extending annularly along the inner circumferential surface; an extension portion that is located upstream of the rotation shaft, the first damper, and the second damper in the air flow direction, and that is parallel to the rotation shaft and extends in the first direction, The sealing member seals between the first damper and the annular convex portion, and also seals between the first damper and the second damper and the extending portion.

[0010] In a first damper device of the present invention, an annular convex portion and an extension portion are formed on the ventilation cylinder. In this damper device, the sealing member seals between the first damper and the second damper and the annular convex portion, and also seals between the first damper and the second damper and the extension portion. This prevents air from flowing through a gap between the inner circumferential surface of the ventilation cylinder and the first damper and the second damper in a closed state, and also prevents air from flowing through a gap between the first damper and the second damper in a closed state.

[0011] As a result, in this damper device, air can be effectively prevented from flowing through the gap between the inner surface of the ventilation cylinder body and the first and second dampers in the closed state, and air can also be effectively prevented from flowing through the gap between the first and second dampers in the closed state.

[0012] Therefore, the first damper device of the present invention can reliably prevent backflow of air when the first damper and the second damper are in the closed state.

[0013] In the first damper device of the present invention, it is preferable that the sealing member has an annular sealing portion that is provided on the annular convex portion, extends annularly along the annular convex portion, and abuts against the first damper and the second damper to seal between the first damper and the second damper and the annular convex portion, and a linear sealing portion that is provided on the extending portion, extends linearly in the first direction, and abuts against the first damper and the second damper to seal between the first damper and the second damper and the extending portion.

[0014] In this case, the configuration of the sealing member can be simplified, while the annular sealing portion can effectively seal between the first damper and the second damper and the annular convex portion, and the linear sealing portion can effectively seal between the first damper and the second damper and the extension portion.

[0015] It is preferable that the linear sealing portions be able to contact the first and second dampers before the annular sealing portions. In this case, the linear sealing portions contact the first and second dampers, thereby slowing down the speed at which the first and second dampers contact the annular sealing portions. Therefore, this damper device can also suppress noise caused by the first and second dampers contacting the annular sealing portions.

[0016] The linear sealing portion preferably includes a first linear sealing portion that abuts against the first damper to seal between the first damper and the extension portion, and a second linear sealing portion that extends parallel to the first linear sealing portion while being spaced apart from the first linear sealing portion and abuts against the second damper to seal between the second damper and the extension portion. In this case, the first linear sealing portion and the second linear sealing portion can more effectively seal between the first damper and the extension portion, and between the second damper and the extension portion.

[0017] The first damper may have a first surface, a first back surface opposite the first surface and located upstream of the first surface in the air flow direction, and a first end surface connecting the first surface and the first back surface. The second damper may have a second surface, a second back surface opposite the second surface and located upstream of the second surface in the air flow direction, and a second end surface connecting the second surface and the second back surface. The annular sealing portion may be able to abut against the first back surface and the second back surface. The first linear sealing portion may be able to abut against the first end surface. It is preferable that the second linear sealing portion be able to abut against the second end surface.

[0018] In this case as well, it is possible to suitably seal between the first damper and the annular convex portion and between the first damper and the second damper and between the extending portion and the extending portion.

[0019] The first damper may have a first surface and a first back surface opposite the first surface and located upstream of the first surface in the air flow direction. The second damper may have a second surface and a second back surface opposite the second surface and located upstream of the second surface in the air flow direction. The sealing member may include a first sealing member attached to the first back surface and a second sealing member attached to the second back surface. Preferably, the first sealing member and the second sealing member abut against the annular protrusion to seal between the first damper and the second damper and between the annular protrusion and the first damper and between the first damper and the second damper and between the extending portion and the second damper.

[0020] This damper device also provides a suitable seal between the first damper and the second damper and the annular convex portion, and a suitable seal between the first damper and the second damper and the extending portion. Furthermore, in this damper device, the first sealing member can function as a weight for the first damper when the first damper transitions from an open state to a closed state. Similarly, the second sealing member can function as a weight for the second damper when the second damper transitions from an open state to a closed state. Therefore, in this damper device, the first damper and the second damper can be easily transitioned from an open state to a closed state.

[0021] The second damper device of the present invention includes a ventilated cylinder body that extends in an axial direction in a cylindrical shape and through which air can flow in the axial direction; a rotating shaft supported by the ventilation cylinder body and extending in a first direction intersecting the axial direction; a first damper and a second damper that are disposed inside the ventilation cylinder and that can be displaced between a closed state in which the ventilation cylinder is closed and an open state in which the ventilation cylinder is opened by rotating around the rotation axis; a sealing member located inside the ventilation cylinder, The ventilation cylinder is provided with an annular protrusion located upstream of the rotation shaft, the first damper, and the second damper in the air flow direction, the annular protrusion protruding from the inner circumferential surface of the ventilation cylinder toward the inside of the ventilation cylinder and extending annularly along the inner circumferential surface, the first damper has a first front surface and a first back surface opposite to the first front surface and located upstream of the first front surface in the air flow direction, the second damper has a second front surface and a second back surface opposite to the second front surface and located upstream of the second front surface in the air flow direction, the sealing member includes a first sealing body attached to the first rear surface and a second sealing body attached to the second rear surface, the first sealing body has a first contact portion that can contact the annular protrusion and a second contact portion that can contact the second sealing body, the second sealing body has a third contact portion that can come into contact with the annular protrusion and a fourth contact portion that can come into contact with the second contact portion, the first contact portion and the third contact portion contact the annular convex portion to seal between the first damper and the annular convex portion, and between the second damper and the annular convex portion, The second contact portion and the fourth contact portion contact each other to seal the gap between the first damper and the second damper.

[0022] In the second damper device of the present invention, the first abutment portion of the first sealing body and the third abutment portion of the second sealing body abut against the annular convex portion, thereby sealing between the first damper and the second damper and the annular convex portion. Furthermore, in this damper device, the second abutment portion of the first sealing body and the fourth abutment portion of the second sealing body abut against each other, thereby sealing between the first damper and the second damper. As a result, like the damper device of the first invention, this damper device can prevent air from flowing through the gap between the inner circumferential surface of the ventilation cylinder and the first damper and the second damper in the closed state, and can also prevent air from flowing through the gap between the first damper and the second damper in the closed state.

[0023] As a result, this damper device can also effectively prevent air from flowing through the gap between the first damper and the second damper in a closed state and the inner surface, and can also effectively prevent air from flowing through the gap between the first damper and the second damper in a closed state.

[0024] Therefore, the second damper device of the present invention can reliably prevent the backflow of air when the first damper and the second damper are in the closed state.

[0025] In the first and second damper devices of the present invention, the ventilation cylinder is preferably connected to an exhaust port of a dryer that dries materials to be dried. In this case, when the first and second dampers are in the open state, air discharged from the exhaust port, i.e., exhaust air, can be suitably discharged to the outside of the dryer through the ventilation cylinder. Furthermore, when the first and second dampers are in the closed position, air outside the dryer can be suitably prevented from flowing back into the dryer through the ventilation cylinder and the exhaust port. [Effects of the Invention]

[0026] The first damper device and the second damper device of the present invention can reliably prevent backflow of air when the first damper and the second damper are in a closed state. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a perspective view of a damper device according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the damper device of the first embodiment. [Figure 3] FIG. 3 is a cross-sectional view of the damper device of the first embodiment taken in the same direction as FIG. [Figure 4] FIG. 4 is a side view showing a dryer or the like in which the damper device of the first embodiment is used. [Figure 5] FIG. 5 is a cross-sectional view of the damper device of the first embodiment taken along line AA in FIG. [Figure 6] FIG. 6 is an enlarged cross-sectional view of a main part of the damper device of the first embodiment, showing the cross section BB of FIG. [Figure 7] FIG. 7 is a cross-sectional view of the damper device of the first embodiment taken in the same direction as FIGS. 2 and 3. FIG. [Figure 8] FIG. 8 is a cross-sectional view of the damper device according to the second embodiment. [Figure 9] FIG. 9 is a cross-sectional view of the damper device of the second embodiment taken in the same direction as FIG. [Figure 10] FIG. 10 is a perspective view of the damper device of the third embodiment. [Figure 11] FIG. 11 is a cross-sectional view of a damper device according to a third embodiment. [Figure 12] FIG. 12 is a cross-sectional view of a damper device according to a third embodiment, taken in the same direction as FIG. [Figure 13] FIG. 13 is a cross-sectional view showing the damper device of the third embodiment taken along line CC in FIG. [Figure 14] FIG. 14 is a cross-sectional view of the damper device according to the fourth embodiment. [Figure 15] FIG. 15 is a cross-sectional view of the damper device of the fourth embodiment taken in the same direction as FIG. [Figure 16] FIG. 16 is a cross-sectional view of the damper device according to the fifth embodiment. [Figure 17] FIG. 17 is a cross-sectional view of the damper device of the fifth embodiment taken in the same direction as FIG. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, first to fifth embodiments of the present invention will be described with reference to the drawings.

[0029] Example 1 1 to 3, the damper device 1 of the first embodiment includes a ventilation cylinder body 11, a rotating shaft 21, a first damper 31, a second damper 41, and a sealing member 51. The damper device 1 is used in a dryer 100 shown in FIG.

[0030] In this embodiment, the up-down direction, front-rear direction, and left-right direction of the damper device 1 are defined by arrows shown in FIG. 1. These up-down direction, front-rear direction, and left-right directions are perpendicular to one another. The up-down direction is an example of the "axial direction" in the present invention. The front-rear direction is an example of the "first direction" in the present invention. In FIG. 2 and subsequent figures, the up-down direction, front-rear direction, and left-right directions of the damper device 1 are defined in accordance with FIG. 1. Furthermore, the up-down direction, front-rear direction, and left-right directions of the dryer 100 correspond to the up-down direction, front-rear direction, and left-right directions of the damper device 1. The posture of the damper device 1 can be changed as appropriate.

[0031] As shown in FIGS. 1 to 3, the ventilation cylinder 11 is composed of a main body 11a and a flange 11b. The ventilation cylinder 11 is made of resin. The main body 11a is formed in a cylindrical shape and extends in the vertical direction. The ventilation cylinder 11 may also be made of metal. The main body 11a may also be formed in a rectangular cylindrical shape, etc.

[0032] The main body 11a has an outer circumferential surface 111 and an inner circumferential surface 112. The outer circumferential surface 111 forms the surface of the main body 11a. The inner circumferential surface 112 is located on the opposite side of the outer circumferential surface 111.

[0033] Furthermore, the main body 11a is formed with the annular protrusion 13 and the extending portion 15, as well as with a first insertion hole 17a and a second insertion hole 17b shown in Figures 1 and 5. As shown in Figures 2 and 3, the annular protrusion 13 protrudes from the inner circumferential surface 112 toward the inside of the main body 11a and goes around the inside of the main body 11a along the inner circumferential surface 112. As a result, the annular protrusion 13 is located inside the main body 11a and has a circular ring shape.

[0034] The extension portion 15 is located inside the main body portion 11a, at a location inside the annular protrusion 13. The extension portion 15 is formed in the shape of a rectangular plate whose left-right length is longer than its up-down length. In other words, the extension portion 15 is formed in the shape of a rectangular plate whose width length is longer than its thickness. As shown in Figures 5 and 6, the extension portion 15 extends linearly in the front-rear direction of the main body portion 11a, passing through the center of the main body portion 11a. The front and rear ends of the extension portion 15 are connected to the annular protrusion 13, respectively. In this way, the annular protrusion 13 and the extension portion 15 are integral with each other.

[0035] 1 and 5, the first insertion hole 17a and the second insertion hole 17b are located in the main body 11a above the annular protrusion 13 and the extension 15. The first insertion hole 17a and the second insertion hole 17b are arranged spaced apart in the front-rear direction across the center of the main body 11a. The first insertion hole 17a and the second insertion hole 17b each penetrate the main body 11a in the front-rear direction in a cylindrical shape. The first insertion hole 17a and the second insertion hole 17b are aligned in the front-rear direction.

[0036] 1, the flange portion 11b is formed in a disk shape having a larger diameter than the main body portion 11a and is connected to the lower end of the main body portion 11a. The flange portion 11b is also formed with a plurality of mounting portions 19 for mounting the ventilation cylinder body 11 to the dryer 100. The shape and number of the mounting portions 19 can be designed as appropriate.

[0037] As shown in FIG. 5, the rotating shaft 21 is made of metal. The rotating shaft 21 is formed in a cylindrical shape and extends in the front-rear direction. Here, the length of the rotating shaft 21 in the front-rear direction is approximately the same as the diameter of the main body 11a of the ventilation cylinder body 11. The rotating shaft 21 is attached to the main body 11a by being inserted into the first insertion hole 17a and the second insertion hole 17b, and is supported by the main body 11a. In this way, the rotating shaft 21 extends so as to penetrate the main body 11a in the front-rear direction while being supported by the main body 11a. The attachment of the rotating shaft 21 to the main body 11a will be described later. The rotating shaft 21 may also be formed in a solid cylindrical shape. Furthermore, the rotating shaft 21 may be made of resin.

[0038] As shown in Figures 1 to 3, the first damper 31 and the second damper 41 are each formed from a metal plate. As shown in Figures 2 and 3, the metal plates forming the first damper 31 and the second damper 41 are designed to have a thin plate thickness. Therefore, although the first damper 31 and the second damper 41 are made of metal, their own weights are light.

[0039] As shown in FIG. 1, the first damper 31 has a first damper main body 31a and a plurality of first connecting portions 31b. The first damper main body 31a is formed in a semicircular plate shape. As shown in FIGS. 2 and 3, the first damper main body 31a has a first front surface 311 and a first back surface 312 located on the opposite side of the first front surface 311. The first connecting portion 31b is integral with the first damper main body 31a at the left end of the first damper main body 31a. As shown in FIG. 1, the first connecting portions 31b are arranged spaced apart from each other in the front-rear direction. Each first connecting portion 31b is curved in a substantially annular shape so that the rotating shaft 21 can be placed therein.

[0040] The second damper 41 has a second damper main body 41a and multiple second connecting portions 41b. The second damper main body 41a is formed in a semicircular plate shape symmetrical to the first damper main body 31a. As shown in FIGS. 2 and 3, the second damper main body 41a has a second front surface 411 and a second back surface 412 located on the opposite side of the second front surface 411. The second connecting portion 41b is integral with the second damper main body 41a at the right end of the second damper main body 41a. As shown in FIG. 1, the second connecting portions 41b are spaced apart from each other in the front-rear direction. Like the first connecting portions 31b, the second connecting portions 41b are also curved in a substantially annular shape so that the rotation shaft 21 can be disposed therein.

[0041] In this damper device 1, the first back surface 312 of the first damper main body 31a and the second back surface 412 of the second damper main body 41a are each facing downward, and the second damper main body 41a is disposed to the left of the first damper main body 31a. In the first damper 31 and the second damper 41, the first connecting portions 31b and the second connecting portions 41b are disposed alternately in the front-rear direction.

[0042] In this damper device 1, the rotating shaft 21 is inserted through the first insertion hole 17a, then inserted through each of the first connecting portions 31b and each of the second connecting portions 41b, and finally inserted through the second insertion hole 17b. As a result, the rotating shaft 21 is attached to and supported by the main body portion 11a of the ventilation cylinder body 11 while being connected to the first damper 31 and the second damper 41. Note that the rotating shaft 21 may also be inserted through the second insertion hole 17b, first through each of the first connecting portions 31b, each of the second connecting portions 41b, and the first insertion hole 17a in this order.

[0043] As described above, the first insertion hole 17a and the second insertion hole 17b are located in the main body 11a above the annular convex portion 13 and the extending portion 15. Therefore, the rotating shaft 21 is supported by the main body 11a above the annular convex portion 13 and the extending portion 15. In addition, the first damper 31 and the second damper 41 connected to the rotating shaft 21 are located in the main body 11a above the annular convex portion 13 and the extending portion 15.

[0044] The first damper 31 and the second damper 41 are rotatable around the rotation shaft 21. Specifically, by rotating around the rotation shaft 21, the first damper 31 and the second damper 41 are displaceable within the main body 11a between a closed position shown in Figures 1, 2, and 5 and an open position shown in Figures 3 and 7.

[0045] In addition, in this damper device 1, the outer diameter of each of the first damper main body portion 31a and the second damper main body portion 41a is formed to be slightly smaller than the inner diameter of the main body portion 11a at a portion other than the annular convex portion 13.

[0046] This prevents interference between the first damper main body portion 31a and the second damper main body portion 41a and the inner circumferential surface 112 of the main body portion 11a when the damper device 1 is displaced between the open state and the closed state. Meanwhile, in the damper device 1, as shown in Fig. 2, when the first damper 31 and the second damper 41 are displaced to the closed state, a first gap S1 inevitably exists between the inner circumferential surface 112 of the main body portion 11a and the first damper main body portion 31a and the second damper main body portion 41a.

[0047] Furthermore, in this damper device 1, when the first damper 31 and the second damper 41 are connected to the rotating shaft 21, a second gap S2 inevitably exists between the first damper 31 and the second damper 41. More specifically, the second gap S2 exists between each first connecting portion 31b and each second connecting portion 41b. The second gap S2 also exists between the left end of the first damper main body portion 31a and the right end of the second damper main body portion 41a, that is, between a portion of the first damper main body portion 31a that is near the rotating shaft 21 and a portion of the second damper main body portion 41a that is near the rotating shaft 21. In this way, in this damper device 1, interference between the first damper 31 and the second damper 41 is prevented when the damper device 1 is switched between the open state and the closed state.

[0048] 6, the sealing member 51 is made of a resin such as synthetic rubber and is elastically deformable. The sealing member 51 has an annular sealing portion 51a and a linear sealing portion 51b.

[0049] The annular sealing portion 51a is formed in an annular shape with approximately the same diameter as the annular protrusion 13. In other words, the annular sealing portion 51a extends in an annular shape along the annular protrusion 13.

[0050] The linear sealing portion 51b is composed of a first linear sealing portion 511 and a second linear sealing portion 512. The first linear sealing portion 511 and the second linear sealing portion 512 are arranged inside the annular sealing portion 51a. The first linear sealing portion 511 and the second linear sealing portion 512 extend parallel to each other in the front-rear direction while being spaced apart in the front-rear direction. The front and rear ends of the first linear sealing portion 511 and the second linear sealing portion 512 are connected to the annular sealing portion 51a. Thus, in the sealing member 51, the annular sealing portion 51a, the first linear sealing portion 511, and the second linear sealing portion 512 are integral with each other.

[0051] The annular sealing portion 51a is attached to the upper surface of the annular protrusion 13 with an adhesive or double-sided tape. The first linear sealing portion 511 and the second linear sealing portion 512 are attached to the upper surface of the extension portion 15 with an adhesive or double-sided tape. In this way, the sealing member 51 is provided on the annular protrusion 13 and the extension portion 15, and is thereby disposed between the annular protrusion 13 and the extension portion 15 and the first and second dampers 31 and 41 in the vertical direction.

[0052] The dryer 100 shown in FIG. 4 is installed indoors (not shown) in a building such as a house. The dryer 100 includes a housing 101, a drum 102, a heated air supply unit 103, and the like. The housing 101 is formed in a generally rectangular box shape extending in the up-down, front-rear, and left-right directions. A door 104 is attached to a front wall 101a of the housing 101 so as to be able to open and close. An exhaust port 105 is formed in a top wall 101b of the housing 101. An exhaust path 106 is further provided inside the housing 101. The exhaust path 106 extends upward inside the housing 101 and is connected to the exhaust port 105 at its upper end.

[0053] The drum 102 and the heated air supply unit 103 are each disposed inside the housing 101. The drum 102 is formed in a cylindrical shape with a bottom and an opening at the front, and is capable of accommodating items to be dried (not shown) that a user (not shown) places through a door 104. Examples of items to be dried include washed clothes and blankets.

[0054] The heated air supply unit 103 is located below the drum 102 inside the housing 101. The heated air supply unit 103 heats air by burning fuel gas and supplies the heated high-temperature air into the drum 102. The heated air supply unit 103 may heat the air using an electric heater.

[0055] In the dryer 100, the material to be dried inside the drum 102 is dried by high-temperature air supplied into the drum 102 from a heated air supply unit 103. The air used to dry the material to be dried flows from the drum 102 through an exhaust path 106 and is discharged from an exhaust port 105 as exhaust air.

[0056] The damper device 1 is attached to the dryer 100. Specifically, in the damper device 1, the main body 11a of the ventilation cylinder 11 is aligned from above with the exhaust port 105 of the dryer 100. Then, in this state, the flange 11b of the ventilation cylinder 11 is brought into contact with the upper wall 101b of the housing 101, and the flange 11b is attached to the upper wall 101b of the housing 101 by each attachment portion 19. In this manner, by attaching the damper device 1 to the dryer 100, the main body 11a of the ventilation cylinder 11 is positioned so as to extend upward of the dryer 100. Then, in the ventilation cylinder 11, the main body 11a is connected to the exhaust port 105.

[0057] Furthermore, an exhaust duct 110 is connected to the main body 11a from above. Although not shown in the drawings, the exhaust duct 110 is in communication with the outdoors.

[0058] In this damper device 1, as described above, the main body 11a of the ventilation cylinder 11 is oriented to extend upward toward the dryer 100, so that the dryer 100 side of the ventilation cylinder 11, i.e., the lower side of the ventilation cylinder 11, is the upstream side in the exhaust gas flow direction. Also, because the main body 11a is oriented to extend upward toward the dryer 100, the first damper 31 and the second damper 41 are each positioned in a closed position due to their own weight inside the main body 11a, as shown in FIG.

[0059] Then, when drying of the material to be dried begins in the dryer 100, exhaust air is discharged into the exhaust port 105 and, ultimately, into the inside of the main body 11a. As a result, in the damper device 1, the first damper 31 and the second damper 41 each rotate around the rotation shaft 21 due to the wind pressure of the exhaust air, and are displaced from the closed position to the open position (see FIG. 3). Here, the amount of displacement of the first damper 31 and the second damper 41 when displacing from the closed position to the open position varies depending on the amount of exhaust air discharged from the exhaust port 105. Also, FIG. 3 shows a state in which the first damper 31 and the second damper 41 are displaced to the open position at their maximum. The same applies to FIGS. 9, 12, 15, and 17, which will be described later.

[0060] In this way, the first damper 31 and the second damper 41, which have been displaced to the open position, open the main body 11a. As a result, as shown by the white arrows in Fig. 3, the exhaust air passes over the first damper 31 and the second damper 41 and flows upward to the main body 11a, i.e., downstream in the exhaust air flow direction. The exhaust air then passes through the exhaust duct 110 and is discharged outdoors.

[0061] On the other hand, as the drying of the material to be dried in the dryer 100 is completed and the flow rate of the exhaust air discharged from the exhaust port 105 decreases, the first damper 31 and the second damper 41 rotate around the rotation shaft 21 due to their own weights and are displaced from the open position toward the closed position, as shown in Fig. 7. Then, as shown in Fig. 2, when the first damper 31 and the second damper 41 reach the closed position, the first damper main body 31a and the second damper main body 41a each assume a substantially horizontal position. In this way, the first damper 31 and the second damper 41 displaced to the closed position close the main body 11a.

[0062] In this damper device 1, the main body 11a is formed with an annular convex portion 13 and an extending portion 15. The sealing member 51 has an annular sealing portion 51a, a first linear sealing portion 511, and a second linear sealing portion 512. The annular sealing portion 51a is adhered to the annular convex portion 13, and the first linear sealing portion 511 and the second linear sealing portion 512 are adhered to the extending portion 15.

[0063] As a result, in this damper device 1, the first damper 31 and the second damper 41 are displaced to the closed position, so that in the first damper 31, the first back surface 312 of the first damper main body 31a abuts against the annular sealing portion 51a and also abuts against the first linear sealing portion 511. In addition, in the second damper 41, the second back surface 412 of the second damper main body 41a abuts against the annular sealing portion 51a and also abuts against the second linear sealing portion 512.

[0064] In the damper device 1, the first back surface 312 and the second back surface 412 abut against the annular sealing portion 51a, thereby sealing the gap between the first damper main body portion 31a and the annular protrusion 13, and the gap between the second damper main body portion 41a and the annular protrusion 13. Therefore, in the damper device 1, although a first gap S1 inevitably exists between the first damper main body portion 31a and the second damper main body portion 41a and the inner circumferential surface 112 of the main body portion 11a, the annular sealing portion 51a prevents air from flowing through the first gap S1 when the first damper 31 and the second damper 41 are in the closed position.

[0065] As a result, in this damper device 1, when the first damper 31 and the second damper 41 are in the closed position, it is difficult for outdoor air, which is outdoor air, to flow through the first gap S1, i.e., to flow back, from the exhaust duct 110 toward the exhaust port 105 of the dryer 100.

[0066] Furthermore, in this damper device 1, the first back surface 312 abuts against the first linear sealing portion 511, and the second back surface 412 abuts against the second linear sealing portion 512, thereby sealing the gap between the first damper main body portion 31a and the extension portion 15, and the gap between the second damper main body portion 41a and the extension portion 15, by the first linear sealing portion 511 and the second linear sealing portion 512. Therefore, in this damper device 1, although the second gap S2 inevitably exists between the first damper 31 and the second damper 41, the first linear sealing portion 511 and the second linear sealing portion 512 prevent air from flowing through the second gap S2 when the first damper 31 and the second damper 41 are in the closed position.

[0067] As a result, in this damper device 1, when the first damper 31 and the second damper 41 are in the closed position, it is difficult for outside air to flow back through the second gap S2.

[0068] Therefore, the damper device 1 of the first embodiment can reliably prevent the backflow of outside air when the first damper 31 and the second damper 41 are in the closed state.

[0069] In particular, this damper device 1 prevents outside air from flowing back through the first gap S1 and the second gap S2 from the exhaust duct 110 toward the exhaust port 105 of the dryer 100, thereby effectively preventing moisture and other substances contained in the outside air from entering the inside of the housing 101 through the exhaust port 105.

[0070] Furthermore, with this damper device 1, when the first damper 31 and the second damper 41 are in the closed state, it is possible to suitably suppress the generation of noise caused by exhaust air present below the first damper 31 and the second damper 41, including the inside of the main body 11a, flowing through the first gap S1 and the first gap S2 toward the exhaust duct 110, as well as to suitably suppress the generation of noise caused by outside air flowing through the first gap S1 and the second gap S2 toward the exhaust port 105. This allows the damper device 1 to exhibit high quietness.

[0071] 7, in the damper device 1, in the process in which the first damper 31 and the second damper 41 are displaced from the open position toward the closed position, the first back surface 312 of the first damper main body portion 31a abuts against the first linear sealing portion 511 before abutting against the annular sealing portion 51a of the sealing member 51. Similarly, the second back surface 412 of the second damper main body portion 41a abuts against the second linear sealing portion 512 before abutting against the annular sealing portion 51a.

[0072] As a result, the first damper 31 abuts against the annular sealing portion 51a in a state where its speed has been slowed down to a certain extent due to abutment with the first linear sealing portion 511. Similarly, the second damper 41 abuts against the annular sealing portion 51a in a state where its speed has been slowed down to a certain extent due to abutment with the second linear sealing portion 512. As a result, in this damper device 1, the generation of noise caused by the first damper 31 and the second damper 41 abutting against the annular sealing portion 51a is also suitably suppressed. In this respect as well, this damper device 1 exhibits high quietness.

[0073] Furthermore, in the damper device 1, the annular sealing portion 51a, the first linear sealing portion 511, and the second linear sealing portion 512 are integrated into the sealing member 51. This makes it possible to easily form the sealing member 51 in the damper device 1 and to easily attach the sealing member 51 to the annular protrusion 13 and the extension portion 15.

[0074] Furthermore, since the first linear sealing portion 511 and the second linear sealing portion 512 are attached to the extension portion 15 while being spaced apart in the left-right direction, in this damper device 1, when the first damper 31 and the second damper 41 are displaced between the open position and the closed position, each of the first connecting portions 31b and each of the second connecting portions 41b is less likely to interfere with the first linear sealing portion 511 and the second linear sealing portion 512.

[0075] Example 2 As shown in FIGS. 8 and 9, the damper device 2 of the second embodiment includes a sealing member 52 instead of the sealing member 51 in the damper device 1 of the first embodiment.

[0076] The sealing member 52 is made up of a first sealing member 52a and a second sealing member 52b. The first sealing member 52a and the second sealing member 52b are made of the same resin as the sealing member 51 in the damper device 1 of the first embodiment. Although detailed illustration is omitted, the first sealing member 52a and the second sealing member 52b are formed in a semicircular plate shape that follows the shapes of the first damper main body portion 31a and the second damper main body portion 41a. Furthermore, the first sealing member 52a and the second sealing member 52b are formed with a constant plate thickness. Furthermore, the plate thickness of the first sealing member 52a and the second sealing member 52b is the same.

[0077] The first sealing member 52a is attached to the first back surface 312 of the first damper main body portion 31a, and the second sealing member 52b is attached to the second back surface 412 of the second damper main body portion 41a. In this way, the first sealing member 52a and the second sealing member 52b are attached to the first damper 31 and the second damper 41, respectively. The first sealing member 52a and the second sealing member 52b are disposed inside the main body portion 11a together with the first damper 31 and the second damper 41, and are positioned above the annular convex portion 13 and the extending portion 15. The other configuration of the damper device 2 of the second embodiment is similar to that of the damper device 1 of the first embodiment, and the same configurations are denoted by the same reference numerals, and detailed description of the configurations will be omitted.

[0078] This damper device 2 is also attached to the dryer 100 in the same manner as the damper device 1 of Example 1, and the main body 11a of the ventilation cylinder 11 is connected to the exhaust port 105. In addition, an exhaust duct 110 is connected to the main body 11a from above (see FIG. 4).

[0079] 8, in this damper device 2, when the first damper 31 and the second damper 41 are displaced to the closed position, the first sealing member 52a comes into contact with the annular convex portion 13 and the extending portion 15. Similarly, the second sealing member 52b comes into contact with the annular convex portion 13 and the extending portion 15.

[0080] Thus, in the damper device 2, the first sealing member 52a seals between the annular protrusion 13 and the extending portion 15 and the first damper main body 31a. The second sealing member 52b seals between the annular protrusion 13 and the extending portion 15 and the second damper main body 41a. More specifically, the first sealing member 52a seals between the annular protrusion 13 and the first damper main body 31a at the location where it abuts against the annular protrusion 13, and seals between the extending portion 15 and the first damper main body 31a at the location where it abuts against the extending portion 15. The second sealing member 52b seals between the annular protrusion 13 and the second damper main body 41a at the location where it abuts against the annular protrusion 13, and seals between the extending portion 15 and the second damper main body 41a at the location where it abuts against the extending portion 15.

[0081] As a result, the first sealing member 52a and the second sealing member 52b, i.e., the sealing member 52, prevent outside air from flowing back through the first gap S1 when the first damper 31 and the second damper 41 are in the closed position, and also prevent outside air from flowing back through the second gap S2 when the first damper 31 and the second damper 41 are in the closed position.

[0082] 9, in this damper device 2, when the first damper 31 and the second damper 41 are displaced from the closed position to the open position, the first sealing member 52a is displaced integrally with the first damper main body 31a and separated from the annular convex portion 13 and the extending portion 15. Similarly, the second sealing member 52b is displaced integrally with the second damper main body 41a and separated from the annular convex portion 13 and the extending portion 15. As a result, in this damper device 2 as well, the exhaust air passes over the first damper 31 and the second damper 41, flows into the exhaust duct 110, and is discharged outdoors (see the white arrows in FIG. 9).

[0083] As described above, the first sealing member 52a and the second sealing member 52b are each formed to have a constant plate thickness in the damper device 2. Therefore, in the damper device 2, when the first damper 31 and the second damper 41 are displaced from the open position toward the closed position, the first sealing member 52a and the second sealing member 52b come into contact with the extending portion 15 before coming into contact with the annular protrusion 13.

[0084] As a result, the damper device 2 can also achieve the same effects as the damper device 1 of the first embodiment.

[0085] Furthermore, in this damper device 2, the first sealing member 52a attached to the first back surface 312 of the first damper main body portion 31a also functions as a weight for the first damper 31 when the first damper 31 and the second damper 41 are displaced from the open position to the closed position and back to the open position. Similarly, the second sealing member 52b attached to the second back surface 412 of the second damper main body portion 41a also functions as a weight for the second damper 41 when the first damper 31 and the second damper 41 are displaced from the open position to the closed position. As a result, in this damper device 2, the first damper 31 and the second damper 41 can be suitably displaced from the open position to the closed position.

[0086] Example 3 As shown in Figures 10 to 12, the damper device 3 of the third embodiment has a first damper 32, a second damper 42 and a sealing member 53 instead of the first damper 31, the second damper 41 and the sealing member 51 in the damper device 1 of the first embodiment.

[0087] 11 and 12, in this damper device 3, an extension portion 16 is formed in the main body portion 11a of the ventilation cylinder 11 instead of the extension portion 15 in the damper device 1 of Example 1. Furthermore, as shown in Fig. 13, in this damper device 3, a first insertion hole 18a and a second insertion hole 18b are formed in the main body portion 11a instead of the first insertion hole 17a and the second insertion hole 17b in the damper device 1 of Example 1.

[0088] Like the extension portion 15 in the damper device 1 of the first embodiment, the extension portion 16 is located inside the main body portion 11a at a location on the inside of the annular protrusion 13. The extension portion 16 passes through the center of the main body portion 11a and extends linearly in the front-to-rear direction of the main body portion 11a, with its front end and rear end each connected to the annular protrusion 13. In this way, the extension portion 16 is integral with the annular protrusion 13.

[0089] 11 and 12, the extension 16 is formed in a rectangular plate shape that is longer in the up-down direction than in the left-right direction. In other words, the extension 16 is formed in a rectangular plate shape that is longer in the up-down direction than in the width direction. As a result, the extension 16 protrudes upward beyond the annular protrusion 13.

[0090] 13, the first insertion hole 18a and the second insertion hole 18b are located in the main body 11a above the annular protrusion 13 and the extending portion 16. In other words, since the extending portion 16 is located above the annular protrusion 13, the first insertion hole 18a and the second insertion hole 18b are formed in the main body 11a above the first insertion hole 17a and the second insertion hole 17b in the damper device 1 of Example 1. Other configurations of the first insertion hole 18a and the second insertion hole 18b are similar to those of the first insertion hole 17a and the second insertion hole 17b.

[0091] 10 to 13, the first damper 32 and the second damper 42 are each made of resin, which reduces the weight of the first damper 32 and the second damper 42.

[0092] As shown in Fig. 10, the first damper 32 has a first damper main body portion 32a and a plurality of first connecting portions 32b. The first damper main body portion 32a is formed in a semicircular plate shape. As shown in Figs. 11 and 12, the first damper main body portion 32a is formed to have a greater plate thickness than the first damper main body portion 31a in the damper device 1 of Example 1. The first damper main body portion 32a has a first front surface 321, a first back surface 322 located on the opposite side of the first front surface 321, and a first end surface 323 located between the first front surface 321 and the first back surface 322 and connecting the first front surface 321 and the first back surface 322.

[0093] Each first connecting portion 32b is integral with the first damper main body portion 32a at the left end of the first damper main body portion 32a. As shown in Fig. 10, the first connecting portions 32b are spaced apart in the front-to-rear direction. As shown in Figs. 11 and 12, each first connecting portion 32b has a rectangular block shape that extends upward and leftward beyond the first damper main body portion 32a, and allows the rotation shaft 21 to be inserted therethrough.

[0094] As shown in Fig. 10, the second damper 42 has a second damper main body portion 42a and a plurality of second connecting portions 42b. The second damper main body portion 42a is formed in a semicircular plate shape symmetrical to the first damper main body portion 32a. The second damper main body portion 42a is also formed to have a greater plate thickness than the second damper main body portion 41a in the damper device 1 of the first embodiment (see Figs. 11 and 12). The plate thickness of the first damper main body portion 32a and the plate thickness of the second damper main body portion 42a are equal.

[0095] The second damper main body portion 42a has a second surface 421, a second back surface 422 located on the opposite side of the second surface 421, and a second end surface 423 located between the second surface 421 and the second back surface 422 and connecting the second surface 421 and the second back surface 422.

[0096] As shown in Figure 10, each second connecting portion 42b is integral with the second damper main body 42a at the right end of the second damper main body 42a. The second connecting portions 42b are spaced apart in the front-to-rear direction. Each second connecting portion 42b has a rectangular block shape that extends upward and to the right of the second damper main body 42a. Like each first connecting portion 32b, each second connecting portion 42b also allows the rotation shaft 21 to be inserted therethrough.

[0097] In this damper device 3, the first back surface 322 of the first damper main body portion 32a and the second back surface 422 of the second damper main body portion 42a are each facing downward, and the second damper main body portion 42a is disposed to the left of the first damper main body portion 32a. In the first damper 32 and the second damper 42, the first connecting portions 32b and the second connecting portions 42b are disposed alternately in the front-rear direction.

[0098] In this damper device 3, the rotating shaft 21 is inserted through the first insertion hole 18a, then inserted through each of the first connecting portions 32b and each of the second connecting portions 42b, and finally inserted through the second insertion hole 18b. As a result, the rotating shaft 21 is attached to and supported by the main body portion 11a of the ventilation cylinder body 11 while being connected to the first damper 32 and the second damper 42. Note that the rotating shaft 21 may also be inserted through the second insertion hole 18b, in this order, through each of the first connecting portions 32b, each of the second connecting portions 42b, and the first insertion hole 18a.

[0099] Thus, in this damper device 3, the first damper 32 and the second damper 42 are disposed inside the ventilation cylinder body 11 while being connected to the rotary shaft 21. More specifically, the first damper 32 and the second damper 42 are disposed inside the main body 11a at a location above the annular convex portion 13 and the extension portion 16. The first damper 32 and the second damper 42 also rotate around the rotary shaft 21, so that they can be displaced between a closed position shown in FIGS. 10, 11, and 13 and an open position shown in FIG. 12.

[0100] 11 , similarly to the damper device 1 of the first embodiment, in this damper device 3, when the first damper 32 and the second damper 42 are displaced to the closed state, a first gap S1 inevitably exists between the first damper main body portion 32 a and the inner circumferential surface 112 of the main body portion 11 a. Also, a second gap S2 inevitably exists between the first damper 32 and the second damper 42.

[0101] 11 and 12, the sealing member 53 is made up of a first sealing piece 53a and a second sealing piece 53b. The first sealing piece 53a and the second sealing piece 53b are also made of the same resin as the sealing member 51 in the damper device 1 of the first embodiment.

[0102] The first sealing piece 53a has a first annular sealing portion 531 and a first linear sealing portion 532. The first annular sealing portion 531 is an example of the "annular sealing portion" of the present invention. The first annular sealing portion 531 extends in a semicircular ring shape along the annular protrusion 13. The first linear sealing portion 532 is located at the left end of the first sealing piece 53a. The first linear sealing portion 532 extends linearly in the front-rear direction and is connected to the first annular sealing portion 531. The first linear sealing portion 532 protrudes upward beyond the first annular sealing portion 531.

[0103] The second sealing piece 53b has a second annular sealing portion 533 and a second linear sealing portion 534. The second annular sealing portion 533 is also an example of the "annular sealing portion" of the present invention. The second annular sealing portion 533 extends in a semicircular ring shape along the annular protrusion 13. The second linear sealing portion 534 is located at the right end of the second sealing piece 53b. The second linear sealing portion 534 extends linearly in the front-rear direction and is connected to the second annular sealing portion 533. The second linear sealing portion 534 protrudes upward beyond the second annular sealing portion 533.

[0104] In the first sealing piece 53a, the first annular sealing portion 531 is attached to the upper surface of the annular protrusion 13, and the first linear sealing portion 532 is attached to the right side surface of the extending portion 16. On the other hand, in the second sealing piece 53b, the second annular sealing portion 533 is attached to the upper surface of the annular protrusion 13, and the second linear sealing portion 534 is attached to the left side surface of the extending portion 16. In this way, the first annular sealing portion 531 and the second annular sealing portion 533 are each attached to the upper surface of the annular protrusion 13, so that the first annular sealing portion 531 and the second annular sealing portion 533 cover almost the entire annular protrusion 13 in an annular shape. In addition, the first linear sealing portion 532 and the second linear sealing portion 534 are arranged spaced apart in the left-right direction.

[0105] Thus, the first sealing piece 53a and the second sealing piece 53b, i.e., the sealing member 53, are provided on the annular convex portion 13 and the extending portion 16, and are disposed below the first and second dampers 32 and 42. Other configurations of this damper device 3 are similar to those of the damper device of the first embodiment.

[0106] This damper device 3 is also attached to the dryer 100 in the same manner as the damper device 1 of the first embodiment, and an exhaust duct 110 is connected to the main body 11a of the ventilation cylinder body 11. In the damper device 3, as well, as the flow rate of exhaust gas discharged from the exhaust port 105 decreases, the first damper 32 and the second damper 42 each rotate around the rotation axis 21 due to their own weight, and are displaced from the open position toward the closed position.

[0107] 11 , in the damper device 3, when the first damper 32 and the second damper 42 are displaced to the closed position, the first annular sealing portion 531 of the first sealing piece 53a abuts against the first back surface 322 of the first damper main body portion 32a, and the first linear sealing portion 532 abuts against the first end surface 323 of the first damper main body portion 32a. Meanwhile, in the second sealing piece 53b, the second annular sealing portion 533 abuts against the second back surface 422 of the second damper main body portion 42a, and the second linear sealing portion 534 abuts against the second end surface 423 of the second damper main body portion 42a.

[0108] As a result, in the damper device 3, the first annular sealing portion 531 seals between the first damper main body portion 32a and the annular protrusion 13, and the first linear sealing portion 532 seals between the first damper main body portion 32a and the extending portion 16. In addition, the second annular sealing portion 533 seals between the second damper main body portion 42a and the annular protrusion 13, and the second linear sealing portion 534 seals between the second damper main body portion 42a and the extending portion 16.

[0109] As a result, the first sealing piece 53a and the second sealing piece 53b, i.e., the sealing member 53, prevent outside air from flowing back through the first gap S1 when the first damper 32 and the second damper 42 are in the closed position, and also prevent outside air from flowing back through the second gap S2 when the first damper 32 and the second damper 42 are in the closed position.

[0110] In the first sealing piece 53a, the first linear sealing portion 532 contacts the first end surface 323 before the first annular sealing portion 531 contacts the first back surface 322. Similarly, in the second sealing piece 53b, the second linear sealing portion 534 contacts the second end surface 423 before the second annular sealing portion 533 contacts the second back surface 422.

[0111] 12, in this damper device 3, when the first damper 32 and the second damper 42 are displaced from the closed position to the open position, the first damper main body 32a and the second damper main body 42a are separated from the sealing member 53. As a result, in this damper device 3 as well, the exhaust air passes over the first damper 32 and the second damper 42, flows into the exhaust duct 110, and is discharged outdoors (see the white arrows in FIG. 12). In this way, this damper device 3 can also achieve the same effect as the damper device 1 of the first embodiment.

[0112] Example 4 14 and 15, the damper device 4 of the fourth embodiment includes a sealing member 54 instead of the sealing member 53 in the damper device 3 of the third embodiment. Also, in this damper device 4, an extension portion 16a is formed on the main body portion 11a of the ventilation cylinder body 11 instead of the extension portion 16 in the damper device 3 of the third embodiment.

[0113] Like the extension portion 16 in the damper device 3 of the third embodiment, the extension portion 16a is formed in a rectangular plate shape whose vertical length is longer than its horizontal length. Here, the extension portion 16a is located inside the main body portion 11a, above the annular protrusion 13, and extends from the inner circumferential surface 112 toward the inside of the main body portion 11a. More specifically, the extension portion 16a extends linearly in the front-to-rear direction of the main body portion 11a while passing through the center of the main body portion 11a. The front and rear ends of the extension portion 16a are connected to the inner circumferential surface 112 and the annular protrusion 13, respectively.

[0114] The sealing member 54 is made up of a first sealing member 54a and a second sealing member 54b. The first sealing member 54a and the second sealing member 54b are made of the same resin as the sealing member 51 in the damper device 1 of the first embodiment.

[0115] The first sealing member 54a has a first main body portion 541 and a first standing wall portion 542. The second sealing member 54b has a second main body portion 543 and a second standing wall portion 544. The first main body portion 541 and the second main body portion 543 are formed in the shape of semicircular plates that follow the shapes of the first damper main body portion 32a and the second damper main body portion 42a, respectively.

[0116] The first standing wall portion 542 is integral with the first main body portion 541 at the left end thereof. The first standing wall portion 542 extends linearly in the front-rear direction and extends higher than the first main body portion 541. The second standing wall portion 544 is integral with the second main body portion 543 at the right end thereof. The second standing wall portion 544 extends linearly in the front-rear direction and extends higher than the second main body portion 543.

[0117] The first sealing member 54a is adhered to the first back surface 322 and the first end surface 323 of the first damper main body portion 32a. Meanwhile, the second sealing member 54b is adhered to the second back surface 422 and the second end surface 423 of the second damper main body portion 42a. In this way, the first sealing member 54a and the second sealing member 54b are attached to the first damper 32 and the second damper 42, respectively, and are disposed inside the main body portion 11a together with the first damper 32 and the second damper 42.

[0118] In the first sealing member 54a, the first standing wall portion 542 protrudes leftward from the first end face 323, and in the second sealing member 54b, the second standing wall portion 544 protrudes rightward from the second end face 423. Other configurations of the damper device 4 are similar to those of the damper device 1 of the third embodiment.

[0119] This damper device 4 is also attached to the dryer 100 in the same manner as the damper device 1 of the first embodiment, and an exhaust duct 110 is connected to the main body 11a of the ventilation cylinder body 11.

[0120] 14, in this damper device 4, when the first damper 32 and the second damper 42 are displaced to the closed position, the first sealing member 54a comes into contact with the annular protrusion 13 and the extending portion 16a, and the second sealing member 54b comes into contact with the annular protrusion 13 and the extending portion 16a. More specifically, in the first sealing member 54a, the first main body portion 541 comes into contact with the annular protrusion 13, and the first standing wall portion 542 comes into contact with the right side surface of the extending portion 16a. Meanwhile, in the second sealing member 54b, the second main body portion 543 comes into contact with the annular protrusion 13, and the second standing wall portion 544 comes into contact with the left side surface of the extending portion 16a.

[0121] Thus, in the damper device 4, in the first sealing member 54a, the first main body portion 541 seals between the annular protrusion 13 and the first damper main body portion 32a, and the first standing wall portion 542 seals between the extending portion 16a6 and the first damper main body portion 32a. Similarly, in the second sealing member 54b, the second main body portion 543 seals between the annular protrusion 13 and the second damper main body portion 42a, and the second standing wall portion 544 seals between the extending portion 16a and the second damper main body portion 42a.

[0122] As a result, the first sealing member 54a and the second sealing member 54b, i.e., the sealing member 54, prevent outside air from flowing back through the first gap S1 when the first damper 32 and the second damper 42 are in the closed position, and also prevent outside air from flowing back through the second gap S2 when the first damper 32 and the second damper 42 are in the closed position.

[0123] In the first sealing member 54a, the first standing wall portion 542 abuts against the extending portion 16a before the first main body portion 541 abuts against the annular protrusion 13. In the second sealing member 54b, the second standing wall portion 544 abuts against the extending portion 16a before the second main body portion 543 abuts against the annular protrusion 13.

[0124] 15, in this damper device 4, when the first damper 32 and the second damper 42 are displaced from the closed position to the open position, the first sealing member 54a is displaced integrally with the first damper main body 32a and separated from the annular convex portion 13 and the extending portion 16a. Similarly, the second sealing member 54b is displaced integrally with the second damper main body 42a and separated from the annular convex portion 13 and the extending portion 16a. As a result, in this damper device 4 as well, the exhaust air passes over the first damper 32 and the second damper 41, flows into the exhaust duct 110, and is discharged outdoors (see the white arrows in FIG. 15). In this way, this damper device 4 can also achieve the same function as the damper device 1 of the first embodiment.

[0125] Furthermore, in this damper device 4, similarly to the damper device 2 of Example 2, the first sealing member 54a and the second sealing member 54b also function as weights for the first damper 32 and the second damper 42, respectively, when the first damper 32 and the second damper 42 are displaced from the open position to the closed position and back to the open position. Therefore, in this damper device 4, the first damper 32 and the second damper 42 can be suitably displaced from the open position to the closed position.

[0126] Example 5 16 and 17, the damper device 5 of the fifth embodiment includes a sealing member 55 instead of the sealing member 53 in the damper device 3 of the third embodiment. Moreover, unlike the damper devices 1 to 4 of the first to fourth embodiments, the damper device 5 does not have extensions 15, 16, 16a formed on the main body portion 11a.

[0127] The sealing member 55 is made up of a first sealing body 55a and a second sealing body 55b. The first sealing body 55a and the second sealing body 55b are made of the same resin as the sealing member 51 in the damper device 1 of the first embodiment.

[0128] The first sealing body 55a has a first contact portion 551 and a second contact portion 552. The second sealing body 55b has a third contact portion 553 and a fourth contact portion 554. The first contact portion 551 and the third contact portion 553 are formed in the shape of a semicircular plate that follows the shapes of the first damper main body portion 32a and the second damper main body portion 42a, respectively.

[0129] The second contact portion 552 is integral with the first contact portion 551 at the left end thereof. The second contact portion 552 extends linearly in the front-rear direction and extends higher than the first contact portion 551. The fourth contact portion 554 is integral with the third contact portion 553 at the right end thereof. The fourth contact portion 554 extends linearly in the front-rear direction and extends higher than the third contact portion 553.

[0130] Here, the second contact portion 552 and the fourth contact portion 554 are formed to have a greater plate thickness than the first standing wall portion 542 and the second standing wall portion 544 in the damper device 4 of the fourth embodiment.

[0131] The first sealing body 55a is attached to the first back surface 322 and the first end surface 323 of the first damper main body 32a, and the second sealing body 55b is attached to the second back surface 422 and the second end surface 423 of the second damper main body 42a. In this way, the first sealing body 55a and the second sealing body 55b are also attached to the first damper 32 and the second damper 42, respectively, and are disposed inside the main body 11a together with the first damper 32 and the second damper 42.

[0132] In addition, in the first sealing body 55a, the second contact portion 552 protrudes leftward from the first end face 323, and in the second sealing body 55b, the fourth contact portion 554 protrudes rightward from the second end face 423. Other configurations of the damper device 5 are similar to those of the damper device 1 of the third embodiment.

[0133] This damper device 5 is also attached to the dryer 100 in the same manner as the damper device 1 of the first embodiment, and an exhaust duct 110 is connected to the main body 11a of the ventilation cylinder body 11.

[0134] 16 , in this damper device 5, when the first damper 32 and the second damper 42 are displaced to the closed position, the first contact portion 551 of the first sealing body 55a comes into contact with the annular protrusion 13. In addition, the third contact portion 553 of the second sealing body 55b comes into contact with the annular protrusion 13. Furthermore, in the first sealing body 55a and the second sealing body 55b, the second contact portion 552 and the fourth contact portion 554 come into contact with each other while facing each other in the left-right direction. At this time, the second contact portion 552 and the fourth contact portion 554 come into contact with each other before the first and second contact portions 551 and 553 come into contact with the annular protrusion 13.

[0135] Thus, in this damper device 5, the first abutment portion 551 seals between the annular protrusion 13 and the first damper main body portion 32a, and the third abutment portion 553 seals between the annular protrusion 13 and the second damper main body portion 42a. The second abutment portion 552 and the fourth abutment portion 554 seal between the first sealing body 55a and the second sealing body 55b below the first damper 32 and the second damper 42.

[0136] As a result, the first sealing body 55a and the second sealing body 55b, i.e., the sealing member 55, prevent outside air from flowing back through the first gap S1 when the first damper 32 and the second damper 42 are in the closed position, and also prevent outside air from flowing back through the second gap S2 when the first damper 32 and the second damper 42 are in the closed position.

[0137] 17, in this damper device 5, when the first damper 32 and the second damper 42 are displaced from the closed position to the open position, the second contact portion 552 and the fourth contact portion 554 are separated from each other. Furthermore, the first sealing body 55a is displaced integrally with the first damper main body portion 32a and separated from the annular convex portion 13. Similarly, the second sealing body 55b is displaced integrally with the second damper main body portion 42a and separated from the annular convex portion 13. As a result, in this damper device 5 as well, the exhaust air passes over the first damper 32 and the second damper 41, flows into the exhaust duct 110, and is discharged outdoors (see the white arrows in FIG. 17). In this way, this damper device 5 can also achieve the same function as the damper device 1 of the first embodiment.

[0138] Furthermore, in this damper device 5, the first sealing body 55a and the second sealing body 55b also function as weights for the first damper 32 and the second damper 42, respectively, when the first damper 32 and the second damper 42 are displaced from the open position to the closed position and back to the open position. Therefore, in this damper device 5, the first damper 32 and the second damper 42 can be suitably displaced from the open position to the closed position.

[0139] Furthermore, in this damper device 5, the extensions 15, 16, 16a are not formed on the main body 11a, so that the ventilation cylinder body 11 can be formed more easily than in the damper devices 1 to 4 of the first to fourth embodiments.

[0140] The present invention has been described above in accordance with Examples 1 to 5, but it goes without saying that the present invention is not limited to the above Examples 1 to 5, and can be modified and applied as appropriate within the scope of the invention.

[0141] For example, in the damper device 1 of the first embodiment, the linear sealing portion 51b of the sealing member 51 is composed of a first linear sealing portion 511 and a second linear sealing portion 512. However, this is not limited thereto, and the linear sealing portion 51b may be composed of a single common line. Then, this linear sealing portion 51b may abut against both the first back surface 312 of the first damper main body portion 31a and the second back surface 412 of the second damper main body portion 41a, thereby sealing the gaps between the first damper main body portion 31a and the extension portion 15 and between the second damper main body portion 41a and the extension portion 15.

[0142] In the damper device 1 of Example 1, the first damper 31 and the second damper 41 are configured as separate bodies from the rotating shaft 21. However, this is not limiting, and the first connecting portion 31b of the first damper 31 or the second connecting portion 41b of the second damper 41 may be integral with the rotating shaft 21. The same applies to the damper devices 2 to 5 of Examples 2 to 5.

[0143] In the damper device 1 of the first embodiment, the first damper 31 and the second damper 41 are displaced from the closed state to the open state by the wind pressure of the exhaust air, and are displaced from the open state to the closed state by their own weight. However, this is not limiting, and the first damper 31 and the second damper 41 may be displaced between the closed state and the open state by the power of a motor or the like. The same applies to the damper devices 2 to 5 of the second to fifth embodiments.

[0144] Furthermore, when the damper device 1 of Example 1 is attached to the dryer 100, the main body 11a of the ventilation cylinder 11 is in a position extending upwardly of the dryer 100. However, this is not limiting, and the damper device 1 may be attached to the dryer 100 in a position in which the main body 11a extends toward the rear or right of the dryer 100. The same applies to the damper devices 2 to 5 of Examples 2 to 5.

[0145] Furthermore, when the damper device 1 of Example 1 is attached to the dryer 100, the main body 11a of the ventilation cylinder 11 is connected to the exhaust port 105. However, the damper device 1 is not limited to this, and may be attached to an exhaust duct of a cooking appliance, a ventilation duct of an air conditioner, etc. The same applies to the damper devices 2 to 5 of Examples 2 to 5. [Industrial Applicability]

[0146] The present invention can be used in exhaust devices for dryers and cooking appliances, as well as air conditioners and the like. [Explanation of symbols]

[0147] 1~5...Damper device 11...Ventilation cylinder body 13...Ring-shaped protrusion 15, 16, 16a...extension part 21...Rotation axis 31, 32...First damper 41, 42...Second damper 51~55...Sealing member 51a...Annular sealing portion 51b…Straight sealing part 52a, 54a...first sealing member 52b, 54b...second sealing member 55a...first sealing body 55b...Second sealing body 100...Dryer 105...Exhaust port 311, 321...first surface 323…First end surface 411, 421…Second surface 423…Second end surface 511, 532...First linear sealing part 512, 534...Second linear sealing part 531...First annular sealing portion (annular sealing portion) 533...Second annular sealing portion (annular sealing portion) 551...First contact part 552...Second contact part 553...Third contact part 554...Fourth contact part

Claims

1. a ventilating cylinder body extending in an axial direction in a cylindrical shape and allowing air to flow therethrough in the axial direction; a rotation shaft supported by the ventilation cylinder body and extending in a first direction intersecting the axial direction; a first damper and a second damper disposed inside the ventilation cylinder and displaceable between a closed state for closing the ventilation cylinder and an open state for opening the ventilation cylinder by rotating around the rotation axis; a sealing member located inside the ventilation cylinder, The ventilation cylinder has an annular protrusion located upstream of the rotation shaft, the first damper, and the second damper in the air flow direction, the annular protrusion protruding from an inner circumferential surface of the ventilation cylinder toward the inside of the ventilation cylinder and extending annularly along the inner circumferential surface; an extending portion that is located upstream of the rotation shaft, the first damper, and the second damper in the air flow direction, and that is parallel to the rotation shaft and extends in the first direction, The damper device, characterized in that the sealing member seals between the first damper and the second damper and the annular convex portion, and also seals between the first damper and the second damper and the extension portion.

2. the sealing member is an annular sealing portion that is provided on the annular convex portion, extends annularly along the annular convex portion, and abuts against the first damper and the second damper to seal between the first damper and the annular convex portion and between the second damper and the annular convex portion; 2. The damper device according to claim 1, further comprising a linear sealing portion provided on the extension portion, extending linearly in the first direction, and abutting against the first damper and the second damper to seal between the first damper and the extension portion and the second damper.

3. The damper device according to claim 2 , wherein the linear sealing portion is capable of contacting the first damper and the second damper before the annular sealing portion contacts the first damper and the second damper.

4. the linear sealing portion includes a first linear sealing portion that abuts against the first damper to seal between the first damper and the extension portion; 4. The damper device according to claim 2, further comprising a second linear sealing portion extending parallel to the first linear sealing portion while being spaced apart from the first linear sealing portion, and abutting the second damper to seal between the second damper and the extension portion.

5. the first damper has a first surface, a first back surface opposite to the first surface and located upstream of the first surface in the air flow direction, and a first end surface connecting the first surface and the first back surface, the second damper has a second front surface, a second back surface opposite to the second front surface and located upstream of the second front surface in the air flow direction, and a second end surface connecting the second front surface and the second back surface, the annular sealing portion is capable of contacting the first rear surface and the second rear surface, the first linear sealing portion is capable of abutting against the first end surface, The damper device according to claim 4 , wherein the second linear sealing portion is capable of abutting against the second end surface.

6. the first damper has a first surface and a first back surface opposite to the first surface and located upstream of the first surface in the air flow direction, the second damper has a second front surface and a second back surface opposite to the second front surface and located upstream of the second front surface in the air flow direction, the sealing member includes a first sealing member attached to the first rear surface and a second sealing member attached to the second rear surface, The damper device according to claim 1, wherein the first sealing member and the second sealing member seal between the first damper and the annular convex portion by abutting against the annular convex portion, and seal between the first damper and the second damper and the extending portion by abutting against the extending portion.

7. a ventilating cylinder body extending in an axial direction in a cylindrical shape and allowing air to flow therethrough in the axial direction; a rotation shaft supported by the ventilation cylinder body and extending in a first direction intersecting the axial direction; a first damper and a second damper disposed inside the ventilation cylinder and displaceable between a closed state for closing the ventilation cylinder and an open state for opening the ventilation cylinder by rotating around the rotation axis; a sealing member located inside the ventilation cylinder, The ventilation cylinder is provided with an annular protrusion located upstream of the rotation shaft, the first damper, and the second damper in the air flow direction, the annular protrusion protruding from an inner circumferential surface of the ventilation cylinder toward the inside of the ventilation cylinder and extending annularly along the inner circumferential surface, the first damper has a first surface and a first back surface opposite to the first surface and located upstream of the first surface in the air flow direction, the second damper has a second front surface and a second back surface opposite to the second front surface and located upstream of the second front surface in the air flow direction, the sealing member includes a first sealing body attached to the first rear surface and a second sealing body attached to the second rear surface, the first sealing body has a first contact portion that can contact the annular protrusion and a second contact portion that can contact the second sealing body, the second sealing body has a third contact portion that can come into contact with the annular protrusion and a fourth contact portion that can come into contact with the second contact portion, the first contact portion and the third contact portion contact the annular convex portion to seal between the first damper and the annular convex portion, and between the second damper and the annular convex portion, The damper device, wherein the second contact portion and the fourth contact portion contact each other to seal the gap between the first damper and the second damper.

8. 8. The damper device according to claim 1, wherein the ventilation cylinder is connected to an exhaust port of a dryer that dries the material to be dried.

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