CN109253575B

CN109253575B - Air door device

Info

Publication number: CN109253575B
Application number: CN201810685208.XA
Authority: CN
Inventors: 坂本学
Original assignee: Nidec Sankyo Corp
Current assignee: Nidec Instruments Corp
Priority date: 2017-07-13
Filing date: 2018-06-28
Publication date: 2020-07-03
Anticipated expiration: 2038-06-28
Also published as: CN208419348U; JP2019020010A; CN109253575A

Abstract

A damper device capable of smoothly opening and closing an opening of a movable cover. In the damper device (1), a guide mechanism (15) guides a movable cover (20) and moves the movable cover in an opening direction (L1) and a closing direction (L2) to control the supply of cold air. In the guide mechanism (15), the dimension in the first direction (Y) is larger than the dimension in the second direction (X) with respect to the gap between the outer peripheral surface of the first guide shaft (121) and the inner peripheral surface of the first guide hole (231), and conversely, the dimension in the second direction (X) is larger than the dimension in the first direction (Y) with respect to the gap between the outer peripheral surface of the second guide shaft (122) and the inner peripheral surface of the second guide hole (232). Therefore, even if the deviation of the clearance occurs at the time of manufacturing, an excessive load is not generated. Therefore, the opening (61) can be smoothly opened and closed by the movable cover (20).

Description

Air door device

Technical Field

The present invention relates to a damper device installed in a fluid passage.

Background

The following techniques are proposed: a damper device is provided at an opening of a fluid passage through which a fluid such as a cooling medium flows, or a ventilation port, to control the flow of the fluid (see patent document 1). Further, as a damper device, the following techniques are proposed: the opening is opened and closed by linearly driving a movable cover covering the opening in an opening direction and a closing direction (see patent document 2). In the damper device described in patent document 2, the drive unit is fixed at a position distant from the partition plate by a support body supported by the partition plate having the opening formed therein, and the rotation of the rotary body of the drive unit is transmitted to the movable cover via the feed screw mechanism, whereby the movable cover is linearly moved. In this case, a form has been proposed in which a guide shaft formed on one of the movable cover and the support is passed through a guide formed on the other to guide the movable cover. Further, there is proposed a structure in which the leading end side of the guide shaft is made thin so that the movable cover can smoothly slide.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 11-118317

Patent document 2: japanese patent laid-open publication No. 2016-161232

Disclosure of Invention

Technical problem to be solved by the invention

However, in the damper device of patent document 2, when the leading end side of the guide shaft is made thin, or when the root portion of the guide shaft is fitted into the guide hole, there is a problem that the movable cover cannot be smoothly slid. Further, when the leading end side of the guide shaft is made thin, there is a problem that the movable cover shakes.

In view of the above problems, an object of the present invention is to provide a damper device capable of smoothly opening and closing an opening of a movable cover.

Technical scheme for solving technical problem

In order to solve the above-described problems, the present invention provides a damper device, comprising: a movable cover disposed so as to cover the opening; a drive unit that linearly drives the movable cover in a closing direction close to the opening portion and an opening direction away from the opening portion; and a support that supports the drive unit from the opening direction side, wherein one of the support and the movable cover is provided with a first guide shaft and a second guide shaft that extend in a moving direction of the movable cover, a first guide hole into which the first guide shaft is fitted and a second guide hole into which the second guide shaft is fitted are provided in the other of the support and the movable cover, and a gap between an outer peripheral surface of the first guide shaft and an inner peripheral surface of the first guide hole, a dimension in a first direction orthogonal to a moving direction of the movable cover is larger than a dimension in a second direction orthogonal to the moving direction of the movable cover and intersecting the first direction, and the dimension in the second direction is larger than the dimension in the first direction with respect to a gap between an outer peripheral surface of the second guide shaft and an inner peripheral surface of the second guide hole.

In the present invention, in the guide shaft and the guide hole for guiding the movable cover, the dimension in the first direction is larger than the dimension in the second direction with respect to the gap between the outer peripheral surface of the first guide shaft and the inner peripheral surface of the first guide hole, and conversely, the dimension in the second direction is larger than the dimension in the first direction with respect to the gap between the outer peripheral surface of the second guide shaft and the inner peripheral surface of the second guide hole. Therefore, even if the deviation of the clearance occurs at the time of manufacturing, an excessive load is not generated. Therefore, the opening can be smoothly opened and closed by the movable cover.

In the present invention, the following manner may be adopted: the one member is the support, and the other member is the movable cover. According to this aspect, the movable cover can be reduced in weight, and therefore the movable cover can be smoothly driven.

In the present invention, the following manner may be adopted: the moving direction of the movable hood and the second direction are horizontal directions, and the first direction is a vertical direction.

In the present invention, the following manner may be adopted: the one member is provided with a third guide shaft extending in a moving direction of the movable cover, the other member is provided with a third guide hole into which the third guide shaft is fitted, and a gap between an outer peripheral surface of the third guide shaft and an inner peripheral surface of the third guide hole is larger in the second direction than in the first direction. According to this aspect, even when the guide shaft and the guide hole are increased, an excessive load is not generated, and therefore, the opening/closing of the opening by the movable cover can be smoothly performed.

In the present invention, the following manner may be adopted: the first guide shaft is staggered with respect to the first direction from the second guide shaft and the third guide shaft, and is located between the second guide shaft and the third guide shaft in the second direction. According to this aspect, the movable cover can be guided by the three sets of guide shafts and guide holes, and therefore the movable cover can be guided in a stable state.

In the present invention, the following manner may be adopted: when the movable cover is moved in the opening direction to the maximum extent, the support and the movable cover abut against each other.

In the present invention, the following manner may be adopted: a protrusion protruding toward the other is formed on one of the support and the movable cover, and the support and the movable cover are brought into contact via the protrusion when the movable cover is moved in the opening direction to the maximum extent. According to this aspect, the support and the movable cover reliably abut against each other. In this case, the following manner may be adopted: a plurality of the protrusions are formed. In the present invention, the following manner may be adopted: the protrusions are formed at three locations. According to this aspect, the support and the movable cover reliably abut against each other. In the present invention, the following manner may be adopted: the three portions are a portion adjacent to the first guide shaft on the radially outer side, a portion adjacent to the second guide shaft on the radially outer side, and a portion adjacent to the third guide shaft on the radially outer side, respectively, as viewed from the center of the movable cover.

In the present invention, the following manner may be adopted: the drive unit includes a drive source and a rotating body that has an engagement portion formed of a spiral convex portion or a spiral concave portion on an outer circumferential surface thereof and is driven by the drive source to rotate about an axis extending toward the movable cover in a moving direction, and the movable cover includes: a rotating body arrangement hole in which a portion of the rotating body on which the engaging portion is formed is arranged; and an engaged portion that engages with the engaging portion at an inner peripheral surface of the rotating body placement hole, and that forms a feed screw mechanism with the engaging portion.

In the present invention, the following manner may be adopted: the support is provided with a fan supported by the movable cover on the closing direction side, the movable cover includes an end plate portion facing the fan in the opening direction and a cylindrical body portion protruding from the end plate portion in the closing direction so as to surround the periphery of the fan, and the end plate portion is provided with the rotor placement hole. In this case, a manner in which the fan is a centrifugal fan may be employed. In the present invention, the following manner may be adopted: the fan is provided with a plurality of connecting shafts for connecting the support body and the fan. In the present invention, the following manner may be adopted: the one member is the support, the other member is the movable cover, and the support and the fan are connected by the first guide shaft and the second guide shaft.

In the present invention, a mode of supplying cold air through the opening portion may be adopted.

(effect of the invention)

Drawings

Fig. 1 is a perspective view of a damper device to which the present invention is applied.

Fig. 2 is a sectional view of a state in which the movable cover is in the closed position in the damper device shown in fig. 1.

Fig. 3 is an exploded perspective view of the damper device shown in fig. 1 with the support member removed.

Fig. 4 is an exploded perspective view of the damper device shown in fig. 1 with the support and the movable cover removed.

Fig. 5 is an exploded perspective view of the damper device shown in fig. 1, with the support, the movable cover, the drive unit, and the fan removed.

Fig. 6 is a perspective view of the movable cover used in the damper device shown in fig. 1, as viewed from the opening direction.

Fig. 7 is a perspective view of the movable cover used in the damper device shown in fig. 1, as viewed from the closing direction.

Fig. 8 is an exploded perspective view of the drive unit used in the damper device shown in fig. 1, as viewed from the opening direction.

Fig. 9 is an exploded perspective view of the drive unit used in the damper device shown in fig. 1, as viewed from the closing direction.

Fig. 10 is an exploded perspective view of a geared motor used in the drive unit shown in fig. 1.

Fig. 11 is an explanatory view of the guide mechanism shown in fig. 4.

(symbol description)

H … in the horizontal direction (second direction), V … in the vertical direction (first direction), L … axis, L1 … in the opening direction, L2 … in the closing direction, X … in the second direction, Y … in the first direction, 1 … damper device, 10 … support, 11 … plate, 12 … connecting shaft, 15 … guide mechanism, 20 … movable cover, 21 … end plate, 22 … cylindrical main body portion, 23 … projection, 24 … cylindrical rib, 25 … rotor disposition hole, 26 … engaged portion, 27 … thick wall portion, 28 … notch, 29 … projection, 30 … drive unit, 31 …, 32 … bottom plate portion, 33, 421 … cylindrical portion, 35 … flange portion, 36 … engaging portion, 37 … transmitting portion, 38 … feed screw mechanism, 40 … gear drive motor, 41 … motor body, 3642, …, 43, …, fan housing …, 3650, 3652 centrifugal 3651, 53 … impeller, 60 … fixing member, 61, 110 … opening part, 100 … fluid passage, 121 … first guide shaft, 122 … second guide shaft, 123 … third guide shaft, 230 … protrusion, 231 … first guide hole, 232 … second guide hole, 233 … third guide hole

Detailed Description

Hereinafter, an embodiment of a damper device to which the present invention is applied will be described with reference to the drawings. In the following description, the rotation center axis of the rotating body is defined as an axis L, and the opening direction L1 and the closing direction L2 of the movable cover 20 in the direction in which the axis L extends are described. In addition, Y is given to a first direction orthogonal to the axis L, and X is given to a second direction orthogonal to the axis L and intersecting the first direction Y. In this embodiment, the first direction Y is a vertical direction V, and the second direction X is a horizontal direction H. In addition, Va and Vb are respectively indicated above and below the vertical direction V. Further, Ha is indicated on one side in the horizontal direction H, and Hb is indicated on the other side.

(Overall Structure)

Fig. 1 is a perspective view of a damper device 1 to which the present invention is applied, fig. 1 (a) is a perspective view of a state in which a movable cover 20 is at a closed position, and fig. 1 (b) is a perspective view of a state in which the movable cover 20 is at an open position. Fig. 2 is a sectional view of the damper device 1 shown in fig. 1 in a state where the movable cover 20 is in the closed position. Fig. 3 is an exploded perspective view of the damper device 1 shown in fig. 1 with the support member 10 removed. Fig. 4 is an exploded perspective view of the damper device 1 shown in fig. 1, with the support 10 and the movable cover 20 removed. Fig. 5 is an exploded perspective view of the damper device 1 shown in fig. 1, with the support 10, the movable cover 20, the drive unit 30, and the fan 50 removed. Fig. 6 is a perspective view of the movable cover 20 used in the damper device 1 shown in fig. 1, as viewed from the opening direction L1. Fig. 7 is a perspective view of the movable cover 20 used in the damper device 1 shown in fig. 1, as viewed from the closing direction L2.

The damper device 1 shown in fig. 1 to 5 controls supply of a fluid in an opening 110 of a fluid passage 100 such as a duct through which a fluid such as cold air flows. In this embodiment, the damper device 1 controls the supply of cold air in the refrigerator. The damper device 1 includes a movable cover 20 disposed so as to cover the opening 110 of the fluid passage 100, a drive unit 30 for linearly driving the movable cover 20 in a closing direction L2 in which the movable cover approaches the opening 110 and in an opening direction L1 in which the movable cover moves away from the opening 110, and a support 10 for supporting the drive unit 30. The support body 10 has a plate portion 11 located on the opening direction L1 side with respect to the drive unit 30, and the plate portion 11 holds the drive unit 30 from the opening direction L1 side.

The damper device 1 has a fixing member 60 for fixing the damper device 1 in the fluid passage 100. The fixing member 60 is formed with an opening 61 overlapping the opening 110 of the fluid passage 100. Therefore, the movable cover 20 is switched by the drive unit 30 between a closed state covering the opening 61 of the fixed member 60 and an open state opening the opening 61 of the fixed member 60. When the damper device 1 is fixed to the fluid passage 100, the damper device 1 may be fixed by the plate portion 11.

The fan 50 is fixed to the support 10 on the side of the movable cover 20 in the closing direction L2, and the fan 50 is in a state of protruding from the fixing member 60 in the opening direction L1. In the present embodiment, the fan 50 is a centrifugal fan 51, and includes a plate 52 that supports a fan motor (not shown), an impeller 53 connected to an output shaft of the fan motor, and an annular connecting portion 54 that connects blades of the impeller 53 to each other, and discharges cold air drawn from the

openings

61 and 110 in a direction perpendicular to a rotation center axis (axis L) as indicated by an arrow C in fig. 1 (b).

Therefore, as shown in fig. 6 and 7, the movable cover 20 includes an end plate portion 21 facing the fan 50 in the opening direction L1, and a cylindrical body portion 22 protruding from the end plate portion 21 in the closing direction L2 so as to surround the periphery of the fan 50.

In the present embodiment, as shown in fig. 1, 3, 4, and 5, when fixing the fan 50 to the support body 10, the support body 10 includes a plurality of connecting shafts 12 protruding from the plate portion 11 in the closing direction L2, and the tip end portions of the connecting shafts 12 are connected to the plate 52 of the fan 50. In this embodiment, three connecting shafts 12 are provided.

(Structure of guide mechanism 15)

In the present embodiment, the three connecting shafts 12 are used as guide shafts of the guide mechanism 15 for guiding when the movable cover 20 is moved in the opening direction L1 and the closing direction L2, respectively. That is, one of the three connecting shafts 12 constitutes a first guide shaft 121, the other connecting shaft 12 constitutes a second guide shaft 122, and the remaining connecting shafts 12 constitute a third guide shaft 123. On the other hand, semicircular protruding portions 23 are formed at three locations on the outer peripheral surface of the cylindrical body portion 22 of the movable cover 20, and a first guide hole 231 into which the first guide shaft 121 is fitted, a second guide hole 232 into which the second guide shaft 122 is fitted, and a third guide hole 233 into which the third guide shaft 123 is fitted are formed in each of the three protruding portions 23. In the present embodiment, since the three connecting shafts 12 are formed at equal angular intervals around the axis L, the three guide shafts (the first guide shaft 121, the second guide shaft 122, and the third guide shaft 123) and the three guide holes (the first guide hole 231, the second guide hole 232, and the third guide hole 233) are formed at equal angular intervals around the axis L.

(Structure of drive unit 30)

Fig. 8 is an exploded perspective view of the drive unit 30 used in the damper device 1 shown in fig. 1, as viewed from the opening direction L1. Fig. 9 is an exploded perspective view of the drive unit 30 used in the damper device 1 shown in fig. 1, as viewed from the closing direction L2. Fig. 10 is an exploded perspective view of the geared motor 40 used in the drive unit 30 shown in fig. 8.

As shown in fig. 8 and 9, the drive unit 30 includes a gear motor 40 and a rotary body 31 that rotates about an axis L by the gear motor 40. The rotary body 31 has a circular bottom plate portion 32 and a cylindrical portion 33 projecting from an outer edge of the bottom plate portion 32 in the opening direction L1, and a nut portion 34 into which an output gear 492 of the geared motor 40 is fitted is formed at the center of the bottom plate portion 32. Therefore, when power is supplied to the gear motor 40 and the output gear 492 rotates, the rotary body 31 rotates about the axis L.

An annular flange 35 that protrudes radially outward is formed at the end of the rotating body 31 in the closing direction L2. The flange portion 35 projects radially outward from a position adjacent to the bottom plate portion 32 in the closing direction L2. As will be described later, the flange portion 35 suppresses leakage of cold air from between the drive unit 30 and the movable cover 20 when the movable cover 20 moves most largely in the closing direction L2. Further, at the inner edge of the flange portion 35, drainage holes 350 are formed at two circumferential locations. The hole 350 is a portion for discharging water attached to the cylindrical portion 33 or ice pieces scraped off from the cylindrical portion 33 to prevent the ice pieces from being sandwiched between the flange portion 35 and the movable hood 20. Further, at a position adjacent to the hole 350 in the opening direction L1, an end 36a of an engagement portion 36 described later protrudes in the closing direction L2. The end portion 36a is a contact portion with which the movable hood 20 abuts when the rotary body 31 rotates about the counterclockwise CCW and the movable hood 20 moves in the closing direction L2.

As shown in fig. 8, 9, and 10, the geared motor 40 includes a motor main body 41 as a drive source and a transmission mechanism 45 that transmits the rotation of the motor main body 41 to the output gear 492. In this embodiment, the motor main body 41 is a stepping motor, and the power supply portion 411 is provided on the outer peripheral side of the stator 410. The geared motor 40 includes a floor plate 42 fixed to a mounting plate 415 fixed to an end of the motor body 41 in the closing direction L2, and a cup-shaped case 43 fixed to the floor plate so as to cover the floor plate 42, and a transmission mechanism 45 is disposed between the floor plate 42 and the case 43. The floor 42 and the housing 43 are coupled by screws 44.

As shown in fig. 10, the transmission mechanism 45 includes a motor pinion 450 fixed to the motor shaft 413 of the motor body 41, a first gear 46 meshing with the motor pinion 450, a second gear 47 meshing with the first gear 46, a third gear 48 meshing with the second gear 47, and a fourth gear 49 meshing with the third gear 48. The first gear 46, the second gear 47, and the third gear 48 are rotatably supported by a first support shaft 460, a second support shaft 470, and a third support shaft 480, respectively, both ends of which are supported by the floor 42 and the housing 43. The fourth gear 49 is rotatably supported by a cylindrical portion 421 protruding from the floor 42 in the closing direction L2.

The first gear 46 is a compound gear in which a large-diameter gear 461 meshing with the motor pinion 450 and a small-diameter gear 462 having a smaller diameter than the large-diameter gear 461 are integrally formed. The second gear 47 is a compound gear in which a large-diameter gear 471 meshed with the small-diameter gear 462 of the first gear 46 and a small-diameter gear 472 having a smaller diameter than the large-diameter gear 471 are integrally formed. The third gear 48 is a compound gear in which a large diameter gear 481 meshing with the small diameter gear 472 of the second gear 47 and a small diameter gear 482 having a smaller diameter than the large diameter gear 481 are integrally formed. The fourth gear 49 is a compound gear in which a large-diameter gear 491 meshing with the small-diameter gear 482 of the third gear 48 and an output gear 492 smaller in diameter than the large-diameter gear 491 are integrally formed. The output gear 492 of the fourth gear 49 is fixed to the rotary body 31 by a screw 490 in a state of being fitted into the nut portion 34 of the rotary body 31, and the fourth gear 49 and the rotary body 31 rotate integrally. Therefore, the transmission mechanism 45 is configured as a reduction gear mechanism, and the rotation of the motor main body 41 is reduced in speed by the transmission mechanism 45 (reduction gear mechanism) and transmitted to the rotating body 31.

(Structure of rotating body 31 and transmission part 37 of movable cover 20)

In this embodiment, the rotation of the rotating body 31 is transmitted to the movable hood 20 via the transmission unit 37, and the movable hood 20 is driven in the opening direction L1 and the closing direction L2 along the axis L. In the present embodiment, the transmission portion 37 is configured to use three guide shafts (the first guide shaft 121, the second guide shaft 122, and the third guide shaft 123) and three guide holes (the first guide hole 231, the second guide hole 232, and the third guide hole 233) as the feed screw mechanism 38 of the anti-backlash mechanism.

More specifically, an engagement portion 36 formed of a spiral convex portion or a spiral concave portion is formed on the outer peripheral surface of the cylindrical portion 33 of the rotating body 31. In the present embodiment, the engagement portion 36 is formed of two convex portions extending in a spiral shape, and the engagement portion 36 extends from an end portion of the cylindrical portion 33 in the opening direction L1 to an end portion in the closing direction L2. Further, a rotor arrangement hole 25 in which a portion (cylindrical portion 33) of the rotor 31 where the engaging portion is formed in the center of the end plate portion 21, and an engaged portion 26 which engages with the engaging portion 36 and forms a feed screw mechanism 38 with the engaging portion 36 is formed on the inner circumferential surface of the rotor arrangement hole 25 in the movable cover 20. In this embodiment, the engaged portion 26 is formed as a groove extending in a spiral shape, and the engaging portion 36 is fitted inside the engaged portion 26. In this embodiment, when the groove (engaged portion 26) is formed, the following structure is formed: a circumferential portion of the inner circumferential surface of the rotor disposition hole 25 is a thick portion 27 extending radially inward, and a groove (engaged portion 26) is formed in the thick portion 27. Here, the engaged portions 26 are formed at two locations in the circumferential direction.

Therefore, a notch 28 that is recessed radially outward is formed at a portion sandwiched by the wall thickness portions 27 in the circumferential direction. Therefore, as shown in fig. 1, when the movable hood 20 is moved in the opening direction L1 in a state where the axis L is arranged in the horizontal direction, water adhering to the outer peripheral surface of the rotating body 31 due to condensation falls inside the movable hood 20 via the notch 28, and then flows out downward from the movable hood 20. Therefore, coagulation or the like is less likely to occur on the outer peripheral surface of the rotating body 31.

In this embodiment, a projection 29 projecting radially inward is formed on the inner peripheral surface of the rotor arrangement hole 25 at a position where the notch 28 is formed. Therefore, it is possible to avoid a situation in which the engagement portion 36 of the rotating body 31 is fitted into the notch 28 when the damper device 1 is assembled. In this embodiment, the convex portion 29 is formed substantially at the center in the circumferential direction of the notch 28. The projections 29 may be formed at a plurality of positions of the notch 28.

(detailed construction in open and closed states)

In the damper device 1 of this embodiment, when the rotary body 31 rotates about the axis L, the engaged portion 26 (groove) of the movable cover 20 is guided by the engaging portion (protrusion) of the rotary body 31, and as a result, the movable cover 20 is driven in the opening direction L1 and the closing direction L2 along the axis L.

More specifically, when the rotary body 31 rotates in the clockwise CW direction about the axis L, the rotation is transmitted to the movable hood 20 via the feed screw mechanism 38, and therefore the movable hood 20 moves in the opening direction L1 in the direction of the axis L. As a result, as shown in fig. 1 (b), the cylindrical body portion 22 of the movable hood 20 is separated from the opening portion 61, and thus, the fixed member 60 and the movable hood 20 are opened. Therefore, as shown by an arrow C in fig. 1 (b), the cold air supplied from the fluid passage 100 is supplied into the refrigerator compartment through the damper device 1.

On the other hand, when the rotary body 31 rotates in the counterclockwise CCW direction about the axis L, the rotation is transmitted to the movable cover 20 via the feed screw mechanism 38, and therefore, the movable cover 20 moves in the closing direction L2 in the axis L direction. As a result, as shown in fig. 1 (a), the cylindrical body portion 22 of the movable hood 20 approaches the opening portion 61, and therefore, the fixed member 60 and the movable hood 20 are in a closed state. Therefore, the supply of the cold air from the fluid passage 100 is cut off, and the supply of the cold air into the cabinet of the refrigerator is stopped.

In this embodiment, when the movable cover 20 is moved to the maximum in the opening direction L1, the end plate portion 21 of the movable cover 20 abuts against the plate portion 11 of the support 10. Here, in the end plate portion 21 of the movable cover 20, the protruding portion 23 in which the guide holes (the first guide hole 231, the second guide hole 232, and the third guide hole 233) are formed protrudes in the opening direction L1 from the other portion of the end plate portion 21. In addition, in the end plate portion 21, the annular convex portion 250 is formed from the edge of the rotor disposition hole 25 in the opening direction L1, but the protruding portion 23 protrudes in the opening direction L1 at the same height as the annular convex portion 250. Therefore, when the movable cover 20 moves to the maximum extent in the opening direction L1, the protruding portion 23 of the end plate portion 21 of the movable cover 20 abuts against the plate portion 11 of the support 10.

In the present embodiment, the three protrusions 23 are each formed with a cylindrical or hemispherical protrusion 230 protruding in the opening direction L1. In this embodiment, the three protrusions 230 are formed at a portion adjacent to the first guide hole 231 (first guide shaft 121) on the radially outer side, at a portion adjacent to the second guide hole 232 (second guide shaft 122) on the radially outer side, and at a portion adjacent to the third guide hole 233 (third guide shaft 123) on the radially outer side, respectively, when viewed from the center of the movable cover 20.

In this embodiment, when the movable cover 20 is moved most largely in the closing direction L2, as shown in fig. 2, the end plate portion 21 of the movable cover 20 approaches the flange portion 35 formed on the rotating body 31 of the drive unit 30 from the opening direction L1 side at a position closer to the closing direction L2 side (opening 61 side) than the rotating body 31 of the drive unit 30 and the transmission portion 37 (feed screw mechanism 38) of the movable cover 20. Therefore, in a state where the movable cover 20 is moved most largely in the closing direction L2, the cold air is suppressed from leaking from the rotary body 31 of the drive unit 30 and the transmission portion 37 (feed screw mechanism 38) of the movable cover 20. Here, either a structure in which the end plate portion 21 of the movable cover 20 abuts against the flange portion 35 of the rotary body 31 when the movable cover 20 moves most largely in the closing direction L2 or a structure in which the end plate portion and the flange portion are separated by a very small gap may be used, and in either case, leakage of cold air from the rotary body 31 of the drive unit 30 and the transmission portion 37 (feed screw mechanism 38) of the movable cover 20 can be suppressed. Further, if the end plate portion 21 of the movable cover 20 abuts against the flange portion 35 of the rotary body 31 when the movable cover 20 moves most largely in the closing direction L2, it is possible to further suppress leakage of the cold air from the rotary body 31 of the drive unit 30 and the transmission portion 37 (feed screw mechanism 38) of the movable cover 20.

In this embodiment, an annular cylindrical rib 24 protruding from the periphery of the rotor disposition hole 25 in the closing direction L2 is formed in the end plate portion 21, and the cylindrical rib 24 is formed so as to surround the rotor disposition hole 25. Therefore, when the movable cover 20 moves most largely in the closing direction L2, the end plate portion 21 of the movable cover 20 approaches the flange portion 35 of the rotating body 31 formed in the drive unit 30 from the opening direction L1 side via the cylindrical rib 24. Therefore, in the state where the movable cover 20 is moved most largely in the closing direction L2, the cold air can be suppressed from leaking from the rotary body 31 of the drive unit 30 and the transmission portion 37 (feed screw mechanism 38) of the movable cover 20.

(clearance of guide mechanism)

Fig. 11 is an explanatory diagram of the guide mechanism shown in fig. 4, which is a cross-sectional view taken when a position where the guide hole is formed is cut by a plane orthogonal to the axis L, and fig. 11 also shows an enlarged view of clearances between the guide holes (the first guide hole 231, the second guide hole 232, and the third guide hole 233) and the guide shafts (the first guide shaft 121, the second guide shaft 122, and the third guide shaft 123).

In the guide mechanism 15 described with reference to fig. 4 and the like, the dimension Y1 in the first direction Y orthogonal to the moving direction of the movable hood 20 is larger than the dimension X1 in the second direction X orthogonal to the moving direction of the movable hood 20 and intersecting the first direction Y with respect to the gap between the outer peripheral surface of the first guide shaft 121 and the inner peripheral surface of the first guide hole 231. In contrast, the dimension X2 in the second direction X is larger than the dimension Y2 in the first direction Y with respect to the clearance between the outer peripheral surface of the second guide shaft 122 and the inner peripheral surface of the second guide hole 232. Further, a dimension X3 in the second direction X is larger than a dimension Y3 in the first direction Y with respect to a gap between the outer peripheral surface of the third guide shaft 123 and the inner peripheral surface of the third guide hole 233. That is, the first guide hole 231, the second guide hole 232, and the third guide hole 233 ensure clearances necessary for sliding after aligning the centers with the first guide shaft 121, the second guide shaft 122, and the third guide shaft 123, and further, set optimum clearances in the vertical direction V and the horizontal direction H.

This structure is realized, for example, by forming the first guide shaft 121, the second guide shaft 122, and the third guide shaft 123 to have a perfect circular cross section and forming the first guide hole 231, the second guide hole 232, and the third guide hole 233 to have a long circular shape (long japanese: Yen shape). The first guide shaft 121, the second guide shaft 122, and the third guide shaft 123 may be formed in an oblong shape in cross section, and the first guide hole 231, the second guide hole 232, and the third guide hole 233 may be formed in a perfect circle shape.

In this embodiment, the moving direction (extending direction of the axis L) and the second direction X of the movable hood 20 are the horizontal direction H, and the first direction Y is the vertical direction V. Therefore, the clearance between the outer peripheral surface of the first guide shaft 121 and the inner peripheral surface of the first guide hole 231 is larger in the vertical direction V than in the horizontal direction H. In contrast, the gap between the outer peripheral surface of the second guide shaft 122 and the inner peripheral surface of the second guide hole 232 is larger in the horizontal direction H than in the vertical direction V. Further, the clearance between the outer peripheral surface of the third guide shaft 123 and the inner peripheral surface of the third guide hole 233 is larger in the horizontal direction H than in the vertical direction V. Therefore, in this embodiment, the guide shafts (the first guide shaft 121, the second guide shaft 122, and the third guide shaft 123) slide with portions of the inner peripheral surfaces of the guide holes (the first guide hole 231, the second guide hole 232, and the third guide hole 233) having narrow clearances. In this embodiment, the first guide shaft 121 is offset from the second guide shaft 122 and the third guide shaft 123 with respect to the first direction Y, and is positioned between the second guide shaft 122 and the third guide shaft 123 in the second direction X. The second guide shaft 122 and the third guide shaft 123 are located at the same position in the first direction Y.

In the guide mechanism configured as described above, the first guide shaft 121, the second guide shaft 122, and the third guide shaft 123 are arranged along the horizontal direction H. Therefore, when the movable cover 20 moves in the opening direction L1 and the closing direction L2 while applying the weight force Vb downward of the vertical direction V, the second guide shaft 122 and the third guide shaft 123 slide in contact with the upper portion 232a of the inner surface of the second guide hole 232 and the upper portion 233a of the inner surface of the third guide hole 233, respectively.

When the movable cover 20 moves in the opening direction L1, the movable cover 20 attempts to rotate clockwise CW, but the rotation at this time is prevented by the portion 231a on the one side Ha in the horizontal direction H of the inner surface of the first guide hole 231 coming into contact with the first guide shaft 121, and in this state, the first guide shaft 121 and the portion 231a on the one side Ha in the horizontal direction H of the inner surface of the first guide hole 231 slide. On the other hand, when the movable cover 20 moves in the closing direction L2, the movable cover 20 attempts to rotate about the counterclockwise CCW, but the rotation at this time is prevented by the portion 231b on the other side Hb of the inner surface of the first guide hole 231 in the horizontal direction H coming into contact with the first guide shaft 121, and in this state, the first guide shaft 121 and the portion 231b on the other side Hb of the inner surface of the first guide hole 231 in the horizontal direction H slide. In this case, since the first guide hole 231 is formed in an oval shape, rattling does not occur, and it is difficult for the movable cover 20 to move due to an excessively small clearance.

(main effect of the present embodiment)

As described above, in the damper device 1 of the present embodiment, when the movable cover 20 is moved in the opening direction L1 by the drive unit 30, the cold air supplied from the opening 61 can be made to flow out to the outside of the movable cover 20, and on the other hand, when the movable cover 20 is moved in the closing direction L2, the opening 61 is covered, and therefore, the flow of the cold air can be stopped.

The drive unit 30 includes a flange portion 35 that protrudes in a direction orthogonal to the driving direction (the axis L direction) of the movable hood 20 at a position closer to the opening 61 than the transmission portion 37 (the feed screw mechanism 38) from the drive unit 30 to the movable hood 20, and when the movable hood 20 moves most in the closing direction L2, the movable hood 20 approaches the flange portion 35 from the opening direction L1 side. Therefore, when the movable cover 20 moves most largely in the closing direction L2, the leakage of the cold air from between the movable cover 20 and the drive unit 30 can be suppressed.

The movable hood 20 includes a cylindrical rib 24 that protrudes toward the flange portion 35 so as to surround the periphery of the transmission portion 37, and when the movable hood 20 moves in the closing direction L2 to the maximum extent, the movable hood 20 and the flange portion 35 approach each other via the cylindrical rib 24. Therefore, when the movable hood 20 moves most largely in the closing direction L2, the movable hood 20 and the flange portion 35 can be reliably brought close to each other. Even when the movable hood 20 and the flange portion 35 abut against each other, if the cylindrical rib 24 is provided, the contact area between the movable hood 20 and the flange portion 35 is narrow, and therefore, the movable hood 20 and the flange portion 35 are unlikely to freeze and become immovable.

Further, since the movable cover 20 is brought close to the flange portion 35 of the drive unit 30 from the opening direction L1, even in the form in which the support 10 supports the drive unit 30 from the side opposite to the side where the opening portion 61 is located (the side of the opening direction L1), when the movable cover 20 moves most largely in the closing direction L2, the leakage of cold air from between the movable cover 20 and the drive unit 30 can be suppressed.

In particular, in this embodiment, since the notch 28 is formed in the inner peripheral surface of the rotor disposition hole 25, the condensed water or the like can be made to flow out from the gap between the notch 28 of the rotor disposition hole 25 and the rotor 31. In this case, there is a possibility that the cold air leaks from the notch 28 when the movable cover 20 moves most largely in the closing direction L2, but in this embodiment, the cold air can be suppressed from leaking from the notch 28 because the movable cover 20 approaches the flange 35 from the side in the opening direction L1.

When the notch 28 is provided in the rotor arrangement hole 25, there is a possibility that the engagement portion 36 of the rotor 31 may be fitted into the notch 28 when the damper device 1 is assembled, but in this embodiment, the protrusion 29 is formed in the notch 28. Therefore, when the damper device 1 is assembled, the engagement portion 36 of the rotating body 31 can be prevented from being fitted into the notch 28.

The fan 50 is supported by the support 10 via a plurality of connecting shafts 12 with respect to the movable cover 20 in the closing direction L2 side, and the guide mechanism 15 is configured by the plurality of connecting shafts 12. Therefore, when the movable hood 20 is driven, a situation such as the movable hood 20 being inclined is less likely to occur.

In the guide mechanism 15, the dimension in the first direction Y is larger than the dimension in the second direction X in the gap between the outer peripheral surface of the first guide shaft 121 and the inner peripheral surface of the first guide hole 231, whereas the dimension in the second direction X is larger than the dimension in the first direction Y in the gap between the outer peripheral surface of the second guide shaft 122 and the inner peripheral surface of the second guide hole 232. Further, the clearance between the outer peripheral surface of the third guide shaft 123 and the inner peripheral surface of the third guide hole 233 is larger in the second direction X than in the first direction Y. Therefore, even if the deviation of the clearance occurs at the time of manufacturing, an excessive load is not generated. In addition, even if expansion or contraction due to temperature change occurs, an excessive load is not generated. Therefore, the opening 61 can be smoothly opened and closed by the movable cover 20. In particular, in this embodiment, since three guide shafts (the first guide shaft 121, the second guide shaft 122, and the third guide shaft 123) are used, the movable hood 20 can be guided in a stable state, and since the gap satisfies the above-described condition, even if the guide shafts are added, the opening 61 can be smoothly opened and closed by the movable hood 20.

Further, since the fan 50 is the centrifugal fan 51, even when the movable cover 20 is disposed on the side of the opening direction L1, the cold air can be discharged without being disturbed by the movable cover 20.

When the movable cover 20 is moved to the maximum extent in the opening direction L1, the support 10 and the movable cover 20 abut against each other, but the support 10 and the movable cover 20 abut against each other via the projection 230 formed on the movable cover 20. Therefore, the support 10 and the movable cover 20 reliably abut. Further, since the support 10 and the movable cover 20 are in contact with each other via the projection 230, the contact area is narrow. Therefore, the support 10 and the movable cover 20 are not likely to freeze and become immovable. Further, since the plurality of projections 230 are formed, the support 10 and the movable cover 20 reliably abut via the projections 230. Since the protrusions 230 are formed at three locations, the support 10 and the movable cover 20 reliably abut at three locations. Further, the three positions where the protrusions 230 are formed are a position adjacent to the first guide shaft 121 on the radially outer side, a position adjacent to the second guide shaft 122 on the radially outer side, and a position adjacent to the third guide shaft 123 on the radially outer side, respectively, when viewed from the center of the movable cover 20. Therefore, the support 10 and the movable cover 20 are in contact with each other via the projection 230 at a position away from the center of the movable cover 20, and therefore, the movable cover 20 is less likely to tilt when the support 10 and the movable cover 20 are in contact with each other.

(other means)

In the above embodiment, the guide shaft is formed on the support 10 side, but the guide shaft may be provided on the movable cover 20 side. In this case, a guide hole is formed on the support body 10 side.

In the above embodiment, when the movable hood 20 is moved to the maximum in the closing direction L2, the flange portion 35 of the drive unit 30 and the movable hood 20 are brought into contact with each other via the cylindrical rib 24 formed on the movable hood 20, but the cylindrical rib 24 may be formed on the flange portion 35 side.

In the above embodiment, when the movable cover 20 is moved to the maximum in the opening direction L1, the support 10 and the movable cover 20 are in contact with each other via the projection 230 formed on the movable cover 20, but the projection 230 may be formed on the support 10 side.

In the above embodiment, the connection shaft 12 connecting the support body 10 and the fan 50 is used as the guide shaft, but the connection shaft 12 and the guide shaft may be formed of different shafts. When the connecting shaft 12 and the guide shaft are formed by different shafts, the overlap in the axial direction of the guide hole and the guide shaft can be increased, and a stable guide amount can be realized. That is, in the case of using the connecting shaft 12 as the guide shaft, only the guide hole and the sliding portion of the connecting shaft 12 (guide shaft) are formed by the thickness amount, but in the case of forming the connecting shaft 12 and the guide shaft by different shafts, it is easy to thicken the portion constituting the guide hole, and to lengthen the guide hole and the sliding portion of the guide shaft in the axial direction.

In the above-described embodiment, the present invention is applied to the damper device 1 attached to the fluid passage 100 through which the cold air (fluid) flows, but the present invention may be applied to the damper device 1 provided in the fluid passage through which various fluids (liquids or gases) other than the cold air flow.

Claims

1. A damper device, comprising:

a movable cover disposed so as to cover the opening;

a drive unit that linearly drives the movable cover in a closing direction close to the opening portion and an opening direction away from the opening portion; and

a support body that supports the drive unit from the opening direction side,

a first guide shaft and a second guide shaft extending in a moving direction of the movable cover are provided on one of the support and the movable cover,

a first guide hole into which the first guide shaft is fitted and a second guide hole into which the second guide shaft is fitted are provided in the other of the support and the movable cover,

a clearance between an outer peripheral surface of the first guide shaft and an inner peripheral surface of the first guide hole is larger in a first direction orthogonal to a moving direction of the movable cover than in a second direction orthogonal to the moving direction of the movable cover and intersecting the first direction,

the clearance between the outer peripheral surface of the second guide shaft and the inner peripheral surface of the second guide hole is larger in the second direction than in the first direction.

2. The damper device of claim 1,

said one component is said support body,

the other component is the movable cover.

3. The damper device of claim 1,

the moving direction of the movable hood and the second direction are horizontal directions,

the first direction is a vertical direction.

4. The damper device of claim 1,

a third guide shaft extending in the moving direction of the movable cover is provided on the one member,

a third guide hole into which the third guide shaft is fitted is provided in the other member,

the clearance between the outer peripheral surface of the third guide shaft and the inner peripheral surface of the third guide hole is larger in the second direction than in the first direction.

5. The damper device of claim 4,

the first guide shaft is staggered with respect to the first direction from the second guide shaft and the third guide shaft, and is located between the second guide shaft and the third guide shaft in the second direction.

6. The damper device of claim 4,

when the movable cover is moved in the opening direction to the maximum extent, the support and the movable cover abut against each other.

7. The damper device of claim 6,

a protrusion protruding toward the other is formed on one of the support and the movable cover,

when the movable cover is moved in the opening direction to the maximum extent, the support and the movable cover are brought into contact with each other via the projection.

8. The damper device of claim 7,

a plurality of the protrusions are formed.

9. The damper device of claim 8,

the protrusions are formed at three locations.

10. The damper device of claim 9,

the three portions are a portion adjacent to the first guide shaft on the radially outer side, a portion adjacent to the second guide shaft on the radially outer side, and a portion adjacent to the third guide shaft on the radially outer side, respectively, as viewed from the center of the movable cover.

11. The damper device of claim 1,

the drive unit includes a drive source and a rotating body that is provided with an engaging portion formed of a spiral convex portion or a spiral concave portion on an outer peripheral surface and that is driven by the drive source to rotate around an axis extending toward the movable cover in a moving direction,

the movable cover includes: a rotating body arrangement hole in which a portion of the rotating body on which the engaging portion is formed is arranged; and an engaged portion that engages with the engaging portion at an inner peripheral surface of the rotating body placement hole, and that forms a feed screw mechanism with the engaging portion.

12. The damper device of claim 11,

a fan is supported by the support body on the closing direction side with respect to the movable cover,

the movable cover includes an end plate portion facing the fan in the opening direction and a cylindrical body portion projecting from the end plate portion in the closing direction so as to surround the fan,

the rotor disposition hole is formed in the end plate portion.

13. The damper device of claim 12,

the fan is a centrifugal fan.

14. The damper device of claim 12,

the fan is provided with a plurality of connecting shafts for connecting the support body and the fan.

15. The damper device of claim 12,

said one component is said support body,

said other component is said movable cover and,

the support body and the fan are connected by the first guide shaft and the second guide shaft.

16. The damper device according to any one of claims 1 to 15, wherein cool air is supplied through the opening portion.