JPH10325669A - Damper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge the aperture angle of a baffle (opening and closing plate) and also, miniaturize a drive mechanism part. SOLUTION: This damper device has an opening and closing plate for opening and closing an aperture, and a driver 2 for driving this opening and closing plate. The driver 2 has a driving source 7, a driving wheel 10 being rotated by this driving source 7, and the first motion gear 12 and the second motion gear 13 as a pair of gears having engaged parts to engage wit the engaging parts 9 of this driving wheel 10 severally and also engaging with each other, and this performs the opening and closing motion of the opening and closing plate, transmitting the rotation of the first motion gear 12 generated by the driving wheel 10 rotating while making the engaging part engage with either of the engaged parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper device using a motor or the like as a drive source and operating an opening / closing plate such as a baffle with respect to an opening, and is particularly suitable for controlling the intake of cool air in a refrigerator. Related to a simple damper device.

[0002]

2. Description of the Related Art As shown in FIGS. 16 and 17, a conventional damper device, in particular, a motor type damper device for a refrigerator, has a baffle 72 and a driving mechanism 73 such as a motor, etc. Are arranged (see Japanese Patent Application Laid-Open No. 6-109354). While the backlash of the baffle 72 and the engagement between the members in the drive mechanism 73 are made loose, the baffle 72
And a leaf spring (not shown) that is constantly pressed in the closing direction of the baffle 72 to increase the degree of sealing of the frame 74. In order to further improve the degree of sealing, the soft tape 7
5, the opening 76 is completely closed by the baffle 72 so that the frame 74 is sunk.

[0003] Such a conventional motor type damper device 7
At 0, the rotational torque of the motor is converted by the spindle into torque in the thrust direction. The baffle 72 is driven to rotate around the rotation fulcrum shaft 71 by the thrust torque of the spindle. As described above, the rotational direction torque is changed to the thrust direction torque.
It is necessary to provide backlash when closing the door. In addition, because of this rattling, the baffle 7
It is necessary to hold down 2.

A motor type damper device 70 having such a structure is used in a refrigerator 80 as shown in FIG. That is, the refrigerator 80 is
And a refrigerator compartment 82 and a vegetable compartment 83,
An evaporator 84 is provided at the bottom of the evaporator. A fan motor 85 is arranged at the rear of the evaporator 84 to circulate the obtained cool air through the freezing room 81 and the refrigeration room 82.

[0005] A partition slope 86 is provided between the evaporator 84 and the refrigerating chamber 82 to block the cool air of the evaporator 84 from flowing directly to the refrigerating chamber 82. On the other hand, a cool air flow passage 87 is formed between the rear part of the partition slope 86 and the rear inner wall of the refrigerator 80, and a motor type damper device 70 is disposed in the cool air flow passage 87. When the baffle 72 of the motor-type damper device 70 is in an open state, the cool air flow passage 87, which is a passage of the cool air, is in a crank state. The motor-type damper device 70 is installed so as to be held by a partition wall 88 that forms a part of the cool air flow passage 87.

[0006] In recent years, with the mid-freezer of the refrigerator, a type of refrigerator in which the cool air obtained at the central evaporator portion is circulated to a refrigerator room at an upper position and a distant position has appeared.

The motor type damper device 70 is of a type orthogonal to the cold air flow passage 87 as described above, and can be used only for bending the flow of the cold air at a right angle. Moreover,
In the refrigerator 80 using such a motor-type damper device 70, since the cold air flow passage 87 has a crank shape, the cold air flow passage 87 becomes long, and loss occurs in terms of cold air transmission. This loss is extremely disadvantageous for a recent mid-freezer refrigerator due to its long cool air flow passage 87. In addition, since the cold air flow passage 87 has a crank shape, as shown in FIG.
8, the protrusion width M into the interior of the refrigerator 80 is increased,
This contributes to reducing the volume of the refrigerator 80.

Further, the opening operation of the baffle 72 does not open to a position parallel to the flow of cold air,
As shown in FIG. 7, since the baffle 72 opens only up to the oblique position, the baffle 72 becomes resistant to the flow of cool air, which is not preferable for rapid diffusion of cool air. Also, regarding the motor type damper device 70 itself,
The width N of the drive mechanism 73 is increased, and that portion forms a large dead space.

Further, such a motor type damper device 7
In a damper device used for a refrigerator or the like, including 0, when the baffle 72 is in the closed position, it is required to completely shut off cold air and the like. In addition, baffle 7
In the closed position 2, it is necessary to prevent the baffle 72 and the like from freezing and locking with other parts. Further, the pressing by the leaf spring has a strong force and is preferable for completely shutting off the cool air. Is not preferred.

Further, recently, there are many refrigerators in which the inside of the refrigerator is divided into four or more rooms instead of the three rooms as in the refrigerator 80 shown in FIG. It is becoming. Therefore, FIG.
Further, a plurality of motor-type damper devices 70 having one opening 76 shown in FIG. 17 are used, or a double damper device 77 having two openings 76 as shown in FIG. 19 is used. This double damper device 77
4, two openings 76, 76 are formed, and a driving mechanism 73 such as a motor is disposed so as to be located on the lower side of the back surface. Then, two baffles 72 as shown in FIGS. 16 and 17 are provided, driven by one synchronous motor (not shown) in the drive mechanism 73, and the openings 76, 76 are provided.
Is opened and closed. This baffle 7
The operations 2 and 72 are such that the two modes are open, both are closed, one is open, the other is closed, the other is open, and one is closed.

[0011]

In the conventional motor type damper device 70 and double damper device 77 shown in FIGS. 16, 17 and 19, the rotational torque of the motor is converted by the spindle in the thrust direction. Baffle 72
Is likely to have a limit on the opening angle of the lens. In addition, since the driving source for the operation in the closing direction of the baffle 72 is a leaf spring, it is difficult to guarantee the reliability of the operation against icing or the like.

In the conventional double damper device 77 shown in FIG. 19, two baffles 72, 72 arranged on the upper side by one synchronous motor in the drive mechanism 73.
Need to be operated, there arises a problem that the drive mechanism 73 including the spindle is inevitably increased in size. That is, the double damper device 77 has a structure in which the spindle abuts against the root of each of the center portions of the baffles 72, 72, so that the distance R between the spindles becomes large, so that the drive mechanism 73 must be large. It has not been obtained.

On the other hand, in consideration of the miniaturization of the driving mechanism 73, the distance P between the two openings 76, 76 is inevitable.
Tends to be smaller. When the distance P between the openings 76, 76 is reduced, the heat insulation between the cool air passages 87 connected to the openings 76, 76 becomes insufficient, and the influence of the temperature of one cool air passage 87 causes the other cool air passage 87 to cool. Will appear. For this reason, severe temperature control for each room is difficult.

The present invention has been made in view of the above problems, and has as its object to provide a damper device capable of increasing the opening angle of the baffle and reducing the size of the drive mechanism. In addition, the present invention provides a double damper having such an effect, that is, a type of damper device provided with two opening and closing plates for opening and closing two openings, in accordance with the recent technical trend of refrigerators. The purpose is to do.

[0015]

According to a first aspect of the present invention, there is provided a damper device having an opening / closing plate for opening / closing an opening and a driving unit for driving the opening / closing plate. A driving unit, a driving vehicle having a driving source, and an engagement unit that is rotationally driven by the driving source;
A pair of gear pairs each having an engaging portion and an engaged portion that can be disengaged and disengaged, and having a pair of gear pairs that have teeth that mesh with each other and that is driven to rotate by a driving wheel. The rotation of one of the gear pairs generated by rotating while engaging with one of the engaged portions is transmitted to the shaft portion of the opening and closing plate to perform the opening and closing operation of the opening and closing plate.

In addition, in the damper device according to the second aspect, in addition to the invention according to the first aspect, the driving wheel rotates one of the gear pairs to open and close the open / close plate and then opens the other of the gear pairs. , One of the gear pairs is rotated in the opposite direction to open and close the open / close plate. According to a third aspect of the present invention, in addition to the first or second aspect, the driving wheel includes a plurality of engaging portions. further,
In the damper device according to the fourth aspect, the drive source is for rotating the drive vehicle bidirectionally.

In view of the above-mentioned object, a damper device according to a fifth aspect of the present invention includes an opening / closing plate for opening / closing an opening and a driving unit for driving the opening / closing plate. A driving source, a cam body rotatably driven by the driving source, a gear portion, and an operating lever which is arranged to be disengageable from the cam body and is driven by engaging with the cam body; A transmission gear meshing with the gear of the body and engaging with the shaft of the opening and closing plate, and transmitting the rotation of the operation lever generated by rotating the cam body to the shaft of the opening and closing plate, Open / close operation.

Further, in the damper device according to the sixth aspect, in addition to the invention according to the fifth aspect, the driving source is a driving source for rotating the cam body in both directions, and the opening / closing plate is biased by biasing means. It is biased in the closing direction. In addition, in the damper device according to claim 7, in addition to the invention according to claim 6, the cam body includes a first feed portion for mechanically rotating the operation lever to one side when rotating in one direction, and another. A second feed portion for mechanically rotating the operation lever to the other when rotating in the direction.

In view of the object of providing the double damper device as described above, the damper device according to the eighth aspect has two opening / closing plates for opening and closing two openings, and the two opening / closing plates. In a damper device having a driving unit for driving an opening / closing plate, the driving unit includes a driving source, a driving wheel having an engaging portion that is rotationally driven by the driving source, and an engaged member that can be disengaged from the engaging portion. A pair of gear pairs each having a mating portion and having teeth meshing with each other, a first drive shaft driven by one of the gear pairs to drive one of the open / close plates, and a cam body rotationally driven by a drive source An operating lever driven by being engaged with the cam body, and a second drive shaft driven by the operating lever to drive the other of the open / close plate, and integrally engaged with the driving vehicle by a driving source. The first drive shaft and the second drive are driven by rotating the section and the cam body. One or two of the opening and closing plate is driven both are opened and closed operation.

According to a ninth aspect of the present invention, in addition to the eighth aspect of the present invention, the two opening / closing plates are arranged at positions facing each other with the drive unit interposed therebetween. According to a tenth aspect of the present invention, in addition to the invention of the eighth or ninth aspect, the driving wheel rotates one of the gear pairs to open one of the open / close plates from a closed state, and then rotates the other of the gear pairs. As a result, one of the pair of gears is rotated in the opposite direction, and one of the open / close plates is changed from open to closed. Further, in the damper device according to the eleventh aspect, in addition to the invention according to the eighth, ninth, or tenth aspect, the driving wheel includes a plurality of engaging portions. Further, in the damper device according to the twelfth aspect, in addition to the invention according to the eighth, ninth, tenth, or eleventh aspect, the operating lever is urged to rotate in the closing direction and is urged to rotate by the cam body. When rotated counterclockwise, the other of the open / close plates changes from closed to open.

According to a thirteenth aspect of the present invention, there is provided a damper device comprising:
In addition to the eighth, ninth, tenth, eleventh and twelfth aspects, the drive source is a drive source for rotating the drive vehicle and the cam body in two directions. Further, the damper device according to claim 14 is, in addition to the invention according to claim 13,
The cam body has a first feed portion for mechanically rotating the operating lever to one side when rotating to one side to open and close the other of the open / close plates, and mechanically moving the operating lever to the other side when rotating to the other side. A second feed unit is provided for rotating the opening / closing plate from open to closed by rotating the opening / closing plate.

Further, the damper device according to claim 15 is
In addition to the invention according to claims 8, 9, 10, 11, 12, 13 or 14, when one of the open / close plates is in the open state and the closed state, the open / close state of the other open / close plate is switched. This opens and closes the open / close state of the two open / close plates,
It can be formed in at least four modes of opening and closing, closing and opening, and closing and closing. Furthermore, in the damper device according to the sixteenth aspect, in addition to the invention according to the eighth, ninth, tenth, eleventh, twelve, thirteenth, thirteenth, or fifteenth aspects, the cam body and the engaging portion are integrally formed with the driving vehicle. Is formed. Further, claim 17
In the damper device described above, in addition to the invention described in claim 16, the cam body and the engagement portion are provided on different surfaces of the driving vehicle.

In each of these damper devices, the power of a drive source such as a motor is transmitted to a baffle serving as an opening / closing plate, and the baffle opens and closes an opening provided in a frame. In the damper device according to claims 1 to 4,
The gear pair meshing with each other is engaged with an engagement portion of a driving wheel that is rotationally driven by a drive source, thereby transmitting one rotation of the gear pair to a shaft portion of the opening and closing plate, and Opening / closing operation is being performed. Therefore, by setting various specifications of the gear pair, the opening angle of the opening / closing plate can be increased. In addition, since one rotation of the gear pair transmitting the driving force to the shaft portion is restrained by the driving wheel, troubles such as icing can be prevented.

Further, in the damper device according to the fifth to seventh aspects, the opening / closing operation of the opening / closing plate is performed by operating the operation lever via the cam body and the transmission gear that are rotationally driven by the driving source. Therefore, the opening angle of the opening / closing plate can be made large by setting a wide range in which the cam body and the operation lever engage with each other and increasing the rotation angle of the operation lever. In addition, if the cam body is made bidirectionally rotatable and the cam body is provided with both a feed section for mechanically rotating the operation lever in one direction and a feed section for rotating the other in the other direction, the operation lever is mechanically movable in either direction. And troubles such as icing can be prevented.

Further, in the damper device according to claims 8 to 17, two openings are provided, and two opening / closing plates open and close the opening. The drive mechanisms for these two open / close plates have different configurations, and one of the open / close plates uses a gear pair and an intermittent rotation mechanism to open / close the open / close plate at a short timing and to perform the operation. The opening angle is increased. The other opening / closing plate sets a wide range of engagement between the cam body and the operating lever, and increases the opening angle of the opening / closing plate by increasing the rotation angle of the operating lever. When the open / close plate on the cam body side is in the open / closed state, the open / close, open / close, close / close and close modes are switched by driving the open / close plate on the gear pair side to switch the open / close state. Since the two rooms can be formed, the temperature of the two rooms can be controlled by one damper device.

Further, when the drive section is disposed between the two open / close plates, a wide dead space unlike the conventional case does not occur. Moreover, the place where the drive unit is disposed is a place where sufficient heat insulation is required, and if the drive unit is provided so as to fit in the minimum necessary space for the heat insulation, no dead space is generated. It will be.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a damper device according to the present invention will be described with reference to FIGS. Although the damper device of this embodiment is a double damper device having two openings and two open / close plates, each drive mechanism for driving each open / close plate is used alone.
It is also possible to use a single damper device.
The double damper device is used for a refrigerator and is a motor-driven damper device driven by a motor.

As shown in FIGS. 1 and 2, the double damper device 1 includes a drive unit 2, two resin frames 3 and 3 arranged on both sides of the drive unit 2, , And two baffles 5a and 5b made of resin as opening and closing plates for opening and closing the openings 4 and 4, respectively.

The drive unit 2 drives the two baffles 5a and 5b. As shown in FIGS. 3 and 4, each member constituting the drive unit 2 is housed in a resin case body 6. Is arranged. That is, in the case body 6, a stepping motor 7 as a driving source, a reduction gear train 8,
Drive wheel 10 having projections 9, 9 as two engagement portions
And a cam body 11 formed integrally with the driving wheel 10
And a first gear pair that can be engaged with the protrusions 9, 9.
An operation gear 12 and a second operation gear 13, an operation lever 14 that engages with the cam body 11, a drive shaft 15 as a first drive shaft for driving the baffle 5a, and a second shaft for driving the baffle 5b. A drive shaft 16 as a drive shaft is arranged.

The case body 6 includes a bottom portion 17 and a bottom portion 17.
Cup-shaped member 19 comprising a side wall portion 18 formed so as to extend in the vertical direction of the bottom portion 17 from the outer peripheral end portion of the
And a lid 20 fixed so as to cover the open portion of the cup 19. In addition, in the bottom part 17 of the case body 6, the insertion holes 21, 21 and
21 and 21 are provided. In addition, the cover member 20 of the case body 6 is also provided with insertion holes 22 at positions corresponding to the insertion holes 21, 21, 21, 21 respectively.

The insertion hole 21 is formed in the side wall 3 of one frame 3.
This is for inserting four cylindrical fixing shafts 3b protruding from a. A receiving hole 3d for inserting the tapping screw 3c for fixing is formed in the distal end portion of the fixed shaft 3b. On the other hand, the insertion hole 22 is for inserting a self-tapping screw 3c that is advanced from the other frame 3 side into the fixing shaft 3b.

In other words, the insertion holes 21 and 22 are used to fix the frames 3 and 3 which are arranged at positions facing each other across the drive unit 2 with respect to the drive unit 2. 3b and a hole for inserting the self-tapping screw 3c into the case body 6. And tapping screw 3c
Are fixed to the fixing shaft 3b through the insertion holes 22 so that the frames 3, 3 are fixed to the case body 6. Further, the side wall portion 18 of the case body 6 includes
As shown in FIG. 1, grooves 23 are provided,
The engaging projections 2 each having a triangular cross section are formed in the groove 23.
3a and 23a are provided. The engagement projections 23a,
Reference numeral 23a locks the engaging arm portions 3e, 3e having elasticity provided on the respective frames 3, and drives the driving portions 2 of the respective frames 3, 3.
It is intended to ensure the fixing to the.

The cover member 20 of the case body 6 is provided with a hole 24 for projecting the drive shaft 16 of the other baffle 5b from the inside of the case body 6 to the outside. Further, the cup-shaped member 19 is integrally provided with a stop portion 25 for regulating the rotation of the first operation gear 12 and the operation lever 14 and preventing the erroneous assembly thereof. Further, a hole 26 is provided in the bottom surface portion 17 of the case body 6 to allow the drive shaft 15 of the one baffle 5 a to protrude from the inside of the case body 6 to the outside.

The case 6 includes a plurality of fixed shafts 2.
8, 29, 30, 31, 32, 33, 34, 35, 36
Is erected. The fixed shafts 28 and 29 are resin shafts provided integrally with the case body 6, and have a stepped portion at the tip which switches from a large diameter to a small diameter. The fixed shafts 28 and 29 are for positioning the stepping motor 7. The base plate 37 fixed on the upper surface of the stepping motor 7 is placed on the above-mentioned stepped portion, and is fixed to the base plate 37. Notch 37a and hole 37 formed
b.

The fixed shaft 30 is a metal shaft erected on the base plate 37, and the fixed shaft 31 is a metal shaft penetrated and fixed to the bottom portion 17 of the case body 6, and fixed shafts 32, 33. , 3
Reference numerals 4, 35, and 36 are resin shafts provided integrally with the bottom portion 17 of the case body 6. The fixed shafts 33, 3
4, 35 and 36 have hollow cavities at the center as shown in FIG.

The fixed shafts 30, 31, 32, and 33 have a first reduction gear 38, a second reduction gear 39, and a third reduction gear
A reduction gear 40 and a fourth reduction gear 41 are rotatably supported respectively. Furthermore, the fixed shaft 34 has the drive vehicle 10
Is rotatably supported. The drive vehicle 10 has projections 9 on the surface of the case body 6 facing the bottom surface portion 17, that is, the lower surface in FIG. Further, the driving wheel 10 is provided with a cam body 11 integrally on a surface of the case body 6 facing the lid member 20, that is, an upper surface in FIG. That is, the cam body 11 and the projections 9 as engagement portions are integrally provided on different surfaces of the driving wheel 10, and are configured to rotate in synchronization.

On the fixed shaft 35, the operation lever 14 and the first operation gear 12 which is one of a pair of gear pairs are rotatably supported coaxially. Further, the second operation gear 13 which is the other of the pair of gear pairs is rotatably supported on the fixed shaft 36. Note that the first operation gear 12 and the second operation gear 13 forming the gear pair are meshed with each other, and are configured to rotate synchronously.

The stepping motor 7 as a driving source is a driving source for bidirectional rotation. The rotational driving force of the stepping motor 7 is reduced by the reduction gear train 8 and transmitted to the driving vehicle 10. The Rukoto. As described above, the driving wheel 10 is formed integrally with the projections 9, 9 and the cam body 11, so that the rotational driving force of the stepping motor 7 is transmitted to the projections 9, 9 and the cam body 11. Becomes

The stepping motor 7 has a fixed shaft 42, on which a rotor 43 having a pinion 43a is rotatably fitted. That is, the pinion 43a of the stepping motor 7 meshes with the teeth 38a of the first reduction gear 38, which is the first stage of the reduction gear train 8, and the pinion 38b of the first reduction gear 38
Nine teeth 39a. The pinion 39b of the second reduction gear 39 meshes with the teeth 40a of the third reduction gear 40, and the pinion 40b of the third reduction gear 40 meshes with the teeth 41a of the fourth reduction gear 41. . Further, the pinion portion 41 of the fourth reduction gear 41
b is engaged with the receiving tooth portion 10a of the driving wheel 10,
The reduction gear train 8 is thus provided with the stepping motor 7.
Is reduced and transmitted to the driving vehicle 10.

The driving wheel 10 is provided with the fitting hole 10b and the fixed shaft 34.
, Is rotatably supported on the case body 6 in both directions. The outer circumference of the drive vehicle 10 is the fourth
Receiving tooth portion 1 meshing with pinion portion 41b of reduction gear 41
The cam body 11 is formed integrally on the upper surface in the axial direction, and the projections 9 are formed integrally on the lower surface in the axial direction. Therefore, the driving force of the stepping motor 7 is
The cam body 11 and the projections 9, 9 are reduced by the reduction gear train 8,
The cam body 11 and the projections 9 are rotatable in both directions by the bidirectional rotation of the stepping motor 7.

As shown in FIGS. 5A and 5B, the cam body 11 is arranged so as to be engaged with and disengaged from the operation lever 14. The cam body 11 has a non-contact surface portion 11a formed of a small-diameter arc-shaped surface and configured not to be engaged with the operation lever 14, and an operation lever 1 formed of a large-diameter arc-shaped surface.
4 and a cam surface 11b that rises radially outward from the non-contact surface portion 11a.
And a first feed portion 11c
And a second feed portion 11d provided at a position 160 ° in the circumferential direction from the second feed portion 11d. In addition, the second feeding unit 11
d is formed of a convex portion having a diameter larger in the radial direction than the first feed portion 11c, and a tip portion thereof is located outside the cam surface 11b.

The operating lever 14 is rotatably supported by the case body 6 by inserting the fitting hole 14a through the fixed shaft 35. The operation lever 14 includes an engagement portion 14b that engages with the cam body 11, and rotation-preventing projections 14c and 14d.
And a gear portion 14e that meshes with a tooth portion 44a of a speed increasing gear 44 as a transmission gear that rotates integrally with the drive shaft 16 of the other baffle 5b. Since the drive shaft 16 is urged to rotate in the closing direction as will be described later, the operating lever 14 is also urged to rotate in the closing direction (the direction of arrow C). The engaging portion 14b is formed of a convex piece formed to extend radially outward from the rotation center of the operation lever 14, and is arranged so as to ride on the cam surface 11b of the cam body 11.

The rotation restricting projection 14c is used to move the operating lever 14 in the direction B from the position shown in FIG. 5B by moving the baffle 5b with a human hand, for example. This is for preventing the operation lever 14 and the speed increasing gear 44 from being disengaged from each other. That is, when the operation lever 14 attempts to rotate in the B direction, it interferes with the speed increasing gear 44 and regulates the rotation range of the operation lever 14. In addition, the rotation regulating convex piece 1
4d is to restrict the rotation range of the operation lever 14 when the operation lever 14 tries to rotate in the direction of arrow C from the position shown in FIG. It has become. The rotation initial position (0 °), which will be described later, is detected by utilizing the rotation restricting convex piece 14d abutting against the contact portion 25.

With this configuration, when the driving wheel 10 rotates in the direction of arrow A from the position shown in FIG. 5A, the cam body 11 rotates integrally with the driving wheel 10. At this time, the cam body 11
Is the engaging portion 14b of the operating lever 14 at the first 160 °.
Since the non-contact surface portion 11a is opposed to the operating lever 14, the operating lever 14 is not engaged, and the operating lever 14 does not operate. For this reason, the drive shaft 16 of the other baffle 5b is held at the closed position by a spring urging force described later. Then, the driving wheel 10 rotates by 160 ° and the cam body 11
When the first feed portion 11c starts to contact the engagement portion 14b of the operation lever 14, the operation lever 14 is sent in the direction of arrow B.

At this time, the operating lever 14 is
4 to rotate the drive shaft 16 from the closed position to the open position. Further, when the driving wheel 10 rotates in the same direction, the operation lever 14 rides on the cam surface 11b of the cam body 11 and holds the position in a positional relationship as shown in FIG. Will be done. Then, even if the cam body 11 rotates in the direction indicated by the arrow A with the operation lever 14 riding on the cam surface 11b, the operation lever 1
4 does not work. In other words, as long as the cam surface 11b and the engaging portion 14b of the operation lever 14 can contact each other, the drive shaft 1
6 will be held in the open position.

It should be noted that while the operation lever 14 is on the cam surface 11b and the driving vehicle 10 is further rotated by 80 ° in the direction indicated by the arrow A from that state until the state shown in FIG. The restricting convex piece 14 c interferes with the speed increasing gear 44. This restricts the rotation angle of the operation lever 14 in the direction indicated by the arrow B. In this embodiment, the stepping motor 7 is set so as to start reverse rotation when it rotates in the forward direction within a predetermined rotation range (260 °). Becomes

Further, based on the positional relationship shown in FIG.
When 0 rotates in the reverse direction of the arrow D, the drive shaft 16 is held in the open position while the operation lever 14 is engaged with the cam surface 11b. Then, when the driving wheel 10 rotates by 80 ° in the direction of arrow D, the operation lever 14 is disengaged from the cam surface 11b, and the engagement with the cam body 11 is released. Then, the operation lever 14 is turned by the rotational urging force in the direction of arrow C.
It turns in the direction of arrow C. That is, the drive shaft 1
6 is transmitted to the operation lever 14 via the speed increasing gear 44, and rotates the operation lever 14 in the direction of arrow C. Then, in a range in which the operation lever 14 does not contact the cam surface 11b and faces the non-contact surface portion 11a, the drive shaft 16 is held at the closed position.

The operating lever 14 may not rotate in the direction C at the position shown in FIG. 5B even if it comes off the cam surface 11b due to icing or the like. The operation lever 14 is mechanically rotated in the direction of arrow A by feeding the second feed portion 11d while abutting on the joint portion 14b.

The driving vehicle 1 is moved from the position shown in FIG.
0 rotates in the direction of arrow D, and the second feed portion 11d
When the operation lever 14 is to be moved in the direction of arrow C while abutting on the rotation lever 4b, the rotation restricting projection 14d abuts against the stop portion 25, so that the rotation angle of the operation lever 14 is restricted. As described above, when the operation lever 14 hits the degree contact portion 25 and the rotation thereof is regulated, the stepping motor 7 recognizes the initial position. In this way, the operating lever 14 is moved by the cam body 11
The baffle 5b is rotated bidirectionally within a predetermined angle range, and the other baffle 5b is rotated to the open / close position.

Further, the projections 9 as engaging portions are formed integrally with the lower surface of the driving wheel 10 in FIG. 4 so as to rotate integrally with the driving wheel 10. I have. As shown in FIGS. 6 (A), 6 (B) and 6 (C), the protruding portions 9 are formed of protruding members extending radially outward from the center of rotation of the driving wheel 10, respectively. The tip portion is formed in an arc shape. And
The drive wheel 10 can be engaged with the first operation gear 12 by this tip portion entering the fitting concave portion 12 a as the engaged portion of the first operation gear 12. That is, the driving wheel 10 rotates the first operation gear 12 by rotating one of the protrusions 9, 9 while engaging the first operation gear 12 with the first operation gear 12.

The first operating gear 12 meshes with the second operating gear 13 and, as will be described later, the first operating gear 12
The fitting concave portion 12a and the fitting concave portion 13a as the engaged portion of the second operation gear 13 have a line-symmetric relationship. for that reason,
When the driving wheel 10 rotates while the projections 9, 9 are engaged with the first operation gear 12, the second operation gear 13 also rotates synchronously and comes to a position where the fitting recesses 12 a, 13 a come into contact with each other. Therefore, the projections 9, 9 are fitted into the fitting recesses 12a.
When the first operating gear 12 is rotated by a predetermined angle, the fitting recess 13a of the second operating gear 13
It is designed to get inside.

The protrusions 9, 9 have their tip portions inserted into the fitting recesses 13a of the second operation gear 13, so that
The second operation gear 13 is engaged. Thus, the projections 9, 9
The driving wheel 10 rotates while one of them engages with the second operation gear 13, thereby rotating the second operation gear 13. When the second operation gear 13 rotates, the first operation gear 12 rotates synchronously and rotates to the original position. In this embodiment, the range in which the driving wheel 10 rotates while the protrusions 9 and 9 are engaged with the first operation gear 12 and the second operation gear 13 is 80 °, and one of the protrusions 9 and the other protrusion 9
It is provided at a position 60 degrees apart.

The first operating gear 12, which is one of the pair of gears, is rotatably supported by the case body 6 coaxially with the operating lever 14 by inserting the fitting hole 12b through the fixed shaft 35. ing. The first operating gear 12 has a shape in which two large-diameter sector gears 12c and small-diameter sector gears 12d having different diameters are integrally arranged in the circumferential direction.

In the section from the vicinity of the other end in the circumferential direction of the outer peripheral edge of the large-diameter sector gear 12c to an intermediate portion, a tooth portion 12e for meshing with the second operating gear 13 which is the other of the gear pair is formed. I have. In addition, a portion as the engaged portion formed such that the projections 9, 9 enter and engage with the portion without the tooth portion 12e in the vicinity of one circumferential end of the outer peripheral edge of the large diameter sector gear 12c. A recess 12a is formed. This fitting recess 12a
Are formed at positions corresponding to the fitting recesses 13 a of the second operation gear 13. On the other hand, a gear portion 12h meshing with a tooth portion 45a of a speed increasing gear 45 that rotates integrally with the drive shaft 15 of one baffle 5a is provided on the outer peripheral edge of the small diameter sector gear 12d.
Is provided.

On the other hand, the second operating gear 13, which is the other of the pair of gears, is rotatably supported by the case body 6 by inserting the fitting hole 13b through the fixed shaft 36. The second operating gear 13 is formed of a sector gear, and a section from the vicinity of the other end in the circumferential direction of the outer peripheral edge to an intermediate portion has a tooth portion 13 c for meshing with the tooth portion 12 e of the first operating gear 12. Are formed. For this reason, the second operation gear 13 is
When the operation gear 12 rotates, it rotates synchronously.

In the vicinity of one end of the outer peripheral edge in the circumferential direction, the teeth 13
In a portion without c, a fitting concave portion 13a is formed as a notched portion to be engaged so that the projecting portions 9, 9 enter and engage. Therefore, when the driving wheel 10 rotates while the protrusions 9 and 9 are inserted into the fitting recesses 13a, the second operation gear 13 rotates and the first operation gear 12 rotates synchronously. The fitting recess 13a is
It is provided at a position corresponding to the first operation gear 12a,
In the position shown in FIG. 6B, the protrusions 9, 9 move from the fitting recess 12 a of the first operation gear 12 to the second operation gear 13.
To the fitting recess 13a or vice versa.

With such a configuration, the first operation gear 12
FIG. 6 (B) shows that the driving vehicle 10 is moved from the position shown in FIG.
Is rotated in the direction of the arrow A by 100 ° to the position shown by the arrow, one of the protrusions 9 enters into the fitting recess 12a and is engaged therewith, and is rotated by the driving wheel 10. By this operation, the first
The operation gear 12 transmits the rotational force of the driving wheel 10 to the speed increasing gear 45 to drive the drive shaft 15 of the one baffle 5a from the closed position to the open position, and to rotate the second operation gear 13. I have. Then, the first operating gear 12 and the second operating gear 13 have a positional relationship in which the fitting recesses 12a and 13a are in contact with each other.

When the driving wheel 10 further rotates in the direction indicated by the arrow A, the driving wheel 10 moves one of the projections 9 to the fitting recess 13 a of the second operation gear 13 to move the second operation gear 13. Start driving. When the driving wheel 10 rotates from the position shown in FIG. 6 (B) to the position shown in FIG. 6 (C) by 80 ° in the direction of arrow A while engaging with the second operation gear 13, the second operation gear And rotates in synchronization with the rotation of the thirteenth
The operation gear 12 returns to the original position. That is,
Fitting recess 12a of first operating gear 12 and second operating gear 13
Is located farthest from the fitting recess 13a. With this operation, the first operation gear 12 rotates the drive shaft 15 of the one baffle 5a from the open position to the closed position. When the driving wheel 10 rotates 180 ° in the direction of arrow A from the position shown in FIG. 6A to the position shown in FIG. 6C, the other of the projections 9 advances into the fitting recess 12 a of the first operation gear 12. Will begin to do so.

When the driving wheel 10 is further rotated by 80 ° in the direction of arrow A from the position shown in FIG. 6C, the baffle 5a hits the opening 4 and the number of steps from the initial position of 0 ° is reduced. The predetermined value is reached, and the stepping motor 7 stops. During this time, the first operation gear 1
2 and the second operating gear 13 are fitted into the fitting recesses 12a, 13
a, and one drive shaft 15 is turned from the closed position to the open position. When the rotation of the drive shaft 15 is restricted, the stepping motor 7 stops at that position, and the baffle 5a is held at the open position. When the baffle 5a is to be rotated by a human hand or the like, the driving vehicle 10
Tries to rotate further in the direction of arrow A, but the cam body 11
The radially protruding portion of the abutment abuts on the engaging portion 14b, and does not rotate any further.

When the driving wheel 10 starts to reversely rotate after a total of 260 ° rotation in the direction of arrow A, the operation opposite to the above-mentioned operation starts. That is, from the positional relationship between the fitting recesses 12a and 13a, the driving wheel 10 rotates in the direction of arrow D while engaging the other of the protrusions 9 with the fitting recess 12a, and the fitting recesses 12a and 13a First so that it is far away
The operation gear 12 is driven. The rotation angle of the driving wheel 10 during this time is 80 °. Then, the positional relationship as shown in FIG. 6C is established, and the drive shaft 15 is rotated to the closed position. Further, when the driving wheel 10 rotates from the position shown in FIG. 6C to the position shown in FIG.
a approaches again, and the drive shaft 15 is again turned to the open position. 6 (B) to FIG. 6 (A)
When the driving wheel 10 rotates to the position shown in FIG.
2a and 13a are separated from each other, and the drive shaft 15 is driven to the closed position. More specifically, the position where the drive vehicle 10 rotates in the direction of arrow A by 20 ° from the position shown in FIG.
Rotate by 0 ° to the initial position (0 °).

On the other hand, the stepping motor 7 as a driving source is as shown in FIG. That is, the rotor 43 is urged to one side by the spring 46 to prevent vibration. In addition, the rotor 43 has a magnet 47 in addition to the pinion 43 a, and the magnet wire 4 faces the magnet 47 and surrounds the rotor 43.
8 and a stator comprising a bobbin 50 provided with a protruding pin 49, two cores 51, 51 and two stator cases 52, 52 are provided.

A side plate 53 and a mounting plate 54 are provided so as to sandwich the stator cases 52, 52.
In addition, the board 55 is attached to the bracket 56, and the protruding pins 49 are connected to the printed circuit on the surface of the board 55. On the other hand, a lead wire 57 for supplying electric power from the outside to the stepping motor 7 is connected to the board 55. The lead wire 57 is taken out from a notch 58 formed in the side wall portion 18 of the case body 6.

Frames 3 and 3 are shown in FIGS. 1, 2 and 7 respectively.
As shown in the figure, it has a thin rectangular prism shape. An opening 4 is formed inside the frames 3 and 3, and shafts 5 c and 5 c which engage with the drive shafts 15 and 16 of the baffles 5 a and 5 b are stored therein. On both sides of each frame 3, drive shafts 15, 16 and shaft portions 5c, 5c
Are formed, and portions of the case body 6 supporting the drive shafts 15, 16 are through holes 3f, 3f. On the other hand, the other end sides of the shaft portions 5c, 5c are fitted into bottomed holes 3g provided in the side wall 3a and are rotatably supported. The portions of the drive shafts 15, 16 and the shaft portions 5c, 5c which engage each other are each formed in an oval shape and are engaged with a slight rotational play.

The side wall 3 on the central side of one frame 3
In a, four fixing shafts 3b for fixing the frames 3 to each other with the drive unit 2 interposed therebetween are projected. A receiving hole 3d is formed in each of the distal ends of the fixing shafts 3b. Then, the fixing shaft 3b is inserted into an insertion hole 21 provided in the bottom portion 17 of the case body 6. In addition, the center side wall 3a of the other frame 3 is inserted with a tapping screw 3c which advances into the receiving hole 3d of the fixing shaft 3 and fixes the frames 3, 3 to the drive unit 2. 4h are provided at four places. With this configuration, the frames 3 and 3 are fixed so as to sandwich the case body 6 that forms the driving unit 2.

On the other hand, the opening 4 is formed by an opening forming portion 4a projecting parallel to the frame 3 surrounding the opening 4b. The portion of the opening forming portion 4a facing the opening 4b is a protruding portion 4c that comes into contact with the baffles 5a and 5b, and forms a contact surface. In addition, the portion protruding on the opposite side to the protruding portion 4c, that is, the protruding portion 4d on the side opposite to the side where the baffles 5a and 5b abut, is provided.
As shown in FIG. 7, locking portions 4e, 4e for locking one ends of biasing springs 59, 59 serving as biasing means for forcibly biasing the baffles 5a, 5b in the closing direction, are provided. The urging springs 59, 59 are respectively connected to the locking portions 4e, 4e.
4e has one end locked and the other end baffle 5
a, 5b are engaged with the opening-side protrusions 5d, 5d.
Although the opening 4 is formed integrally with the frame 3, it may be formed as a separate member.

With this configuration, the baffles 5a, 5b
Are forcibly urged in the direction indicated by the arrow A in FIG. 7, that is, in the closing direction about the shaft portions 5 c, 5 c as the center of rotation. Therefore, the drive shaft 16 and the speed increasing gear 44 on the baffle 5b side
Are always urged to rotate in the closing direction, and the operation lever 14 is urged to rotate in the arrow C direction. Therefore, the operation lever 14 is configured to rotate in the closing direction when the engagement with the cam surface 11b of the cam body 11 is released. That is, the biasing spring 59 is a drive source that rotates the drive shaft 16 in the closing direction. Note that even if the operation lever 14 does not rotate in the closing direction due to icing or the like, the second feed portion 11d of the cam body 11
And the operating lever 14 is rotated in the closing direction. This ensures that the baffle 5b closes even if icing or the like occurs.

On the other hand, the drive shaft 15 and the speed increasing gear 45 on the baffle 5a side are also constantly urged to rotate in the closing direction. When the baffle 5 a is in the closed state, the projections 9, 9 are not engaged with the first operation gear 12 and the second operation gear 13, that is, in a rattled state. That is, the rotational driving force is not transmitted. With such a configuration, the baffles 5a and 5b
In the completely closed state, the state is closed by the urging force of the urging spring 59.

On the opening 4 side of the baffles 5a and 5b, a soft tape 60 serving as a cushioning member is fixed.
a and 5b. The baffles 5a,
Ribs may be provided on the back side of 5b to maintain the strength of baffles 5a and 5b. Also, baffle 5
7a and 5b are rotatable around the drive shafts 15 and 16, and open and close in the directions indicated by arrows A or B in FIG. The soft tape 60 is made of foamed polyurethane so as to increase the amount of sink when the soft tape 60 comes into contact with the protruding portion 4c, but may be made of another elastic member such as foamed polyethylene or a rubber member.

The circuit configuration of the stepping motor 7 is shown in FIG.
It is as shown in. That is, the two windings 61
And eight transistors 62 and eight diodes 63
, And the elements are symmetrically arranged so as to be driven in a bipolar manner.

The double damper device 1 configured as described above is incorporated in, for example, a refrigerator 64 or the like having a mid-freezer as shown in FIG. Here, the same members as those shown in FIG. 16 are denoted by the same reference numerals, and description thereof will be omitted. The refrigerator 64 is a mid-freezer refrigerator.
A freezing compartment 81 is provided at the center, a refrigeration compartment 82 is provided at an upper portion, and a vegetable compartment 83 is provided at a lower portion. A duct 65 for blowing cool air to the refrigerator compartment 82 is formed, and the double damper device 1 is fitted into a portion of the duct 65 which communicates with the refrigerator compartment 82 and the vegetable compartment 83. That is, the frame 3 of the double damper device 1
Are fitted so as to form a part of the duct 65, and the double damper device 1 itself also serves as the duct 65. The double damper device 1 may be disposed at the entrance of the duct 65, in other words, at the exit of the room of the evaporator 84.

Next, the operation of the double damper device 1 will be described. The relationship between the open / closed state of the baffles 5a and 5b and the rotation angle of the driving vehicle 10 is shown in FIG.
4 and the operation explanatory diagram shown in FIG. FIG. 10 shows that the rotation angle of the driving vehicle 10 is 0 °.
(A) shows the open / closed state of the baffle 5a, and (B) shows the open / closed state of the baffle 5b. Also,
Similarly, FIG. 11 shows a state in which the driving vehicle 10 is in the 20 ° state, FIG. 12 shows a state in which the driving vehicle 10 is in the 100 ° state, and FIG.
In the 80 ° state, FIG. 14 shows the 260 ° state of the driving vehicle 10, (A) in each of FIGS. 11 to 14 shows the open / closed state of the baffle 5a, and (B) shows the open / closed state of the baffle 5b. Are respectively shown.

First, after assembling the double damper device 1 into the refrigerator 64, initial setting is performed by the following method. That is, the stepping motor 7 is rotated in the reverse direction to rotate the cam body 11 and the projections 9 and 9 integrally with the driving wheel 10. Then, it is sent to the second feed portion 11d of the cam body 11 and the operation lever 14 rotates, and FIG.
As shown in (B), the operation lever 14 is locked by abutting the rotation restricting projection 14d against the stop portion 25 provided on the case body 6, and the driving wheel 10 is also in the locked state. In addition,
At this time, the stepping motor 7 outputs a drive signal of a step number capable of rotating beyond 0 °. As described above, in the present embodiment, by outputting an extra drive signal to the stepping motor 7 from the state where the drive vehicle 10 is locked, the initial set position (0 °) is obtained.
Has been detected.

At this initial setting position (0 °), FIG.
As shown in (A) and (B), baffles 5a and 5b
Both are in the closed state. In this embodiment,
As shown in FIGS. 11A and 11B, the initial setting position (0
°) to the position rotated 20 °, the baffles 5a, 5
b both remain closed. When the baffles 5a and 5b are closed, the driving force of the stepping motor 7 is not transmitted. In this closed state, the baffles 5a, 5b
Are biased to rotate in the closing direction.

From such a state, a CPU or the like for controlling the temperature in the refrigerator 64 by the operation of the refrigerator 64 instructs the double damper device 1 to introduce cold air into the room in which the baffles 5a and 5b are involved. Then, the rotor 43 of the stepping motor 7 is driven, and its rotation is transmitted to the driving vehicle 10 via the pinion 43a, the first reduction gear 38, the second reduction gear 39, the third reduction gear 40, and the fourth reduction gear 41. You. In the present embodiment, as shown in FIG. 15, the baffle 5
a and 5b are controlled respectively.

That is, the drive vehicle 10 is rotated by 80 ° in the forward direction from the position (20 °) shown in FIGS. 11A and 11B, and the position (100) shown in FIGS.
In this case, the cam body 11 idles without engaging with the operation lever 14. Therefore, the operation lever 14 does not rotate, and the baffle 5b remains closed. During this, one of the projections 9 is engaged with the fitting recess 1 of the first operation gear 12.
The first operation gear 12 is rotated while rotating into the inside 2a.

Then, in synchronization with the first operation gear 12, the second
The operating gear 13 also rotates, and the first operating gear 12 and the second operating gear 13 have a positional relationship in a state where the fitting concave portions 12a and 13a are brought close to each other. Then, the tooth portion 12 of the first operation gear 12
The speed increasing gear 45 engaged with e rotates integrally with the drive shaft 15, and the baffle 5a is rotated in the opening direction. That is, during this period, while the baffle 5b maintains the closed state, the baffle 5a is switched from the closed state to the open state, and the baffles 5a and 5b are changed from the closed / closed mode to the open / close mode.

Further, the drive vehicle 10 is further rotated by 80 ° from the position (100 °) shown in FIGS. 12A and 12B to obtain a position (FIG. 13A and FIG. 1
80 °), the first feed portion 1 of the cam body 11
1C is fed while abutting on the engaging portion 14b of the operation lever 14, so that the operation lever 14 is moved in the direction indicated by the arrow B in FIG.
It will rotate in the direction. Then, the speed increasing gear 44 engaged with the gear portion 14 e of the operation lever 14 is moved to the drive shaft 16.
, And the baffle 5b is rotated in the opening direction. The operation lever 14 further moves the cam body 1.
When 1 rotates, it rides on the cam surface 11b and is held in position.

On the other hand, during this time, one of the projections 9 moves from the fitting recess 12a of the first operating gear 12 to the fitting recess 13a of the second operating gear 13, and rotates while entering the fitting recess 13a. , The second operating gear 13 is rotated. Then, the first operation gear 12 rotates in synchronization with the second operation gear 13, and as shown in FIG. 13A, the first operation gear 12 and the second operation gear 13 are fitted into the fitting recesses 12 a, 13 a.
Are kept away from each other. During this time, the speed increasing gear 45
Rotates integrally with the drive shaft 15, and the baffle 5a rotates in the closing direction. That is, during this period, the baffle 5b changes from the closed state to the open state, and the baffle 5a
The baffles 5a and 5 are rotated together from the open state to the closed state.
b is changed from the open / close mode to the close / open mode.

Further, the driving vehicle 10 is further moved to the state shown in FIG.
14 (A) and (B), the cam body 11 is in operation. The lever 14 idles while the engaging portion 14b of the lever 14 contacts the cam surface 11b. Therefore, the operation lever 14
Does not rotate, and the baffle 5b remains open. On the other hand, one of the projections 9 is disengaged from the fitting recess 13a of the second operation gear 13 during this time, and the other of the projections 9 enters the fitting recess 12a of the first operation gear 12 instead. Will come. Then, the other of the protrusions 9 rotates the first operation gear 12.

Then, in synchronization with the first operation gear 12, the second
The operating gear 13 also rotates, and the first gear as shown in FIG.
The operating gear 12 and the second operating gear 13 are fitted with fitting recesses 12a,
13a is brought close to the position. Then, the speed increasing gear 4 engaged with the tooth portion 12e of the first operation gear 12
5 rotates integrally with the drive shaft 15, and the baffle 5a is rotated in the opening direction. That is, during this period,
While the baffle 5b maintains the open state, the baffle 5a
Is switched from the closed state to the open state, and both baffles 5a, 5b
Is changed from the closed-open mode to the open-open mode.

When the drive vehicle 10 is rotated from the initial position (0 °) to a position of 260 ° as shown in FIGS. 14A and 14B, the stepping motor 7 rotates in the reverse direction. Is set. When the driving wheel 10 is rotated in the reverse direction by the stepping motor 7, the baffles 5a, 5b
Sequentially executes the above-described modes.

That is, when the driving wheel 10 is rotated in the opposite direction from the position of 260 ° to the position of 180 °, the baffles 5a and 5b are changed from the open / open mode to the closed / open mode. When the drive vehicle 10 is rotated from the position of 180 ° to the position of 100 °, the baffles 5a and 5b are switched from the closed / open mode to the open / close mode. When the driving wheel 10 is further rotated from the position of 100 ° to the position of 20 °, the baffles 5a,
5b changes from the open / close mode to the close / close mode.

When the driving wheel 10 is further rotated in the reverse direction from the position of 20 °, the second feed portion 11 d of the cam body 11 is rotated.
Then, the operation lever 14 is rotated, and the rotation restricting convex piece 14d of the operation lever 14 is brought into contact with the stop portion 25. At this time, while the stepping motor 7 outputs an extra driving signal, the rotation of the driving wheel 10 is mechanically controlled. The initial rotation position of the driving vehicle 10 is detected at 0 ° by the automatic locking.

Here, the movement between the four modes, such as the transition of the baffles 5a, 5b from the open / close position to the open / open position and the transition from the closed / closed position to another position, is performed by the stepping motor 7b.
The number of steps and the direction of rotation can be detected and controlled to freely perform the operations.

Here, the movement time of the baffles 5a and 5b from the open position to the closed position and the movement time in the opposite direction is controlled by the pulse generation rate. Further, the baffles 5a and 5b can be stopped at an intermediate position between the open position and the closed position instead of the completely open position. Although the movement angle from the open position to the closed position is set to 45 ° in this embodiment, other angles may be appropriately used.

In this embodiment, since the opening 4 is formed perpendicular to the frame 3, the thickness of the frame 3 can be reduced. For this reason, the entire device including the frame 3 is reduced in size, and the double damper device 1 can be easily attached to another device, for example, a refrigerator. In addition, since the open positions of the baffles 5a and 5b are substantially parallel to the frames 3 and 3, the cool air flowing along the frames 3 and 3 when the baffles 5a and 5b are open is
There is almost no obstruction by the openings 5b and the openings 4 and 4, and the air flows straight. For this reason, the transmission loss of the cold air is eliminated, and the refrigerator has high efficiency of the cold air transmission and the cold air diffusion.

Further, in this embodiment, the baffle 5 is surely controlled in spite of the control by the number of pulses.
a and 5b can be brought to the closed position and the open position.
That is, if the baffles 5a and 5b do not operate once due to the stray time of the stepping motor 7 or the freezing of the baffles 5a and 5b, the closing operation and the opening operation cannot be performed reliably. The cam body 11, the operation lever 14, the projections 9, 9, the first operation gear 12, and the second
The use of the mechanism for securely bringing the operating gear 13 into contact with the feeding mechanism makes it possible to mechanically ensure the closed position and the open position mechanically. For this reason, malfunctions due to icing and leaks of cool air that should not occur do not occur.

In addition, the meshing portion between the first operating gear 12, the tooth portion 12e, and the tooth portion 45a of the speed increasing gear 45, and the tooth of the gear portion 14e of the operating lever 14 and the tooth portion 44 of the speed increasing gear 44.
By adjusting the number of teeth in the meshing part of a, the baffle 5
The operation angles of a and 5b can be increased. In addition,
In this embodiment, an operation angle of 45 ° is provided.

The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention. is there. For example, it is possible to take out only a mechanism for operating the baffle 5a and use a single damper for driving one baffle or a single damper using a mechanism for operating the baffle 5b.

In the above-described embodiment, the stepping motor 7 is bidirectionally rotated.
If the protruding portion of the cam body 11 is removed, the four modes can be obtained even if the stepping motor 7 is rotated only in one direction. In this case, the closing operation of the baffle 5b depends completely on the biasing spring 59.

Further, in the above-described embodiment, as a mechanism for driving the baffle 5a, the rotation of the first operation gear 12 is transmitted to the drive shaft 15 at an increased speed via the speed-increasing gear 45 so as to be driven. Although the rotation angle of the shaft 15 is configured to be larger, if not particularly required, one end of the drive shaft 15 is directly fixed to the rotation center of the first operation gear 12 and the speed increasing gear 45 is omitted. You may. In addition, as a mechanism for driving the baffle 5b, one end of the drive shaft 16 is directly fixed to the rotation center of the cam body 11, and the speed increasing gear 4
4 may also be omitted.

Further, the soft tape 60 is provided at the portion of the baffles 5a, 5b which comes into contact with the projection 4c of the opening 4, but the soft tape 60 is omitted when the degree of sealing of the baffles 5a, 5b is not strictly required. May be. further,
In the above embodiment, the reduction gear train 8 is used.
The reduction gear train 8 is not always necessary. As the driving method of the stepping motor 7, other driving methods such as bipolar driving and unipolar driving can be appropriately adopted, and various specifications such as a step angle and a torque also have various values according to the usage form. Can be adopted.

In the above-described embodiment, the frames 3 and 3 are duct-shaped damper devices, but can be applied to damper devices having other configurations. Further, the present invention can be applied to various damper devices for controlling other fluids, such as a ventilation duct, instead of a refrigerator. Further, the frames 3 and 3 may be configured using a frame on a side to which the damper device is attached, for example, a cool air blowing duct 65 of the refrigerator 64 shown in FIG. When three or more openings 4 are arranged side by side, the double damper device 1 can be used for a part thereof. Further, a plurality of, specifically, two projections 9 are provided as engagement portions. However, in the case of a single damper, one projection 9 may be provided.

Also, instead of the stepping motor 7, D
Another drive source such as a C motor or an AC synchronous motor may be used. In this case, a drive source that rotates only in one direction may be used as long as the drive mode is not limited to the four modes described above.

[0095]

As described above, in the double damper device of the present invention, the power of the drive source such as the motor is transmitted to the baffle serving as the opening and closing plate, and the baffle is opened and closed with respect to the opening provided in the frame. In the damper device according to any one of claims 1 to 4, the gear pair meshing with each other is engaged with an engaging portion of a driving wheel that is rotationally driven by a driving source, so that the gear pair is engaged. Is transmitted to the drive shaft to open and close the opening and closing plate. Therefore, the opening / closing operation of the opening / closing plate can be performed at a short timing by using the gear pair and the intermittent mechanism, and the opening angle can be increased. In addition, since one rotation of the gear pair transmitting the driving force to the driving shaft is restricted by the driving wheel, the opening / closing plate can be reliably operated even if icing or the like occurs.

Further, in the damper device according to the fifth to seventh aspects, the opening / closing operation of the opening / closing plate is performed by operating the operating lever via the cam body and the transmission gear that are rotationally driven by the driving source. Therefore, the opening angle of the opening / closing plate can be made large by setting a wide range in which the cam body and the operation lever engage with each other and increasing the rotation angle of the operation lever. In addition, if the cam body is made bidirectionally rotatable and the cam body is provided with both a feed section for mechanically rotating the operation lever in one direction and a feed section for rotating the other in the other direction, the operation lever is mechanically movable in either direction. The opening and closing plate can be reliably operated even if icing or the like occurs.

Further, in the damper device according to the eighth to seventeenth aspects, two openings are provided, and the two opening / closing plates open and close with respect to the openings. The drive mechanisms of these two open / close plates have different configurations, and one of the open / close plates can increase the open angle of the open / close plate by setting various specifications of the gear pair. The other opening / closing plate has a wide range of engagement between the cam body and the operating lever, and a large opening angle of the opening / closing plate can be obtained by increasing the rotation angle of the operating lever. In addition, the opening and closing timing of the two mechanisms is shifted, and when the opening and closing plate on the cam body is in the open and closed states, the opening and closing state is driven by driving the opening and closing plate on the gear pair side to switch the opening and closing state. By shifting the opening and closing of, a plurality of modes can be set.

Further, by providing a structure in which a driving section is provided between two open / close plates, a dead space can be reduced. In addition, since the distance between the two openings can be increased by disposing the driving unit, the heat insulating effect is enhanced, and severe temperature control can be performed. Further, since the drive section is provided between the open / close plates, the operation can be easily transmitted to the respective open / close plates, and the distance between the openings can be set more freely than before. For this reason, the mechanism of the drive unit can be simplified, design can be made easily in accordance with the heat insulating effect, and air path design becomes easy.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional plan view of a damper device according to an embodiment of the present invention as viewed from above, and a partial cross-sectional view taken along line AA thereof.

FIG. 2 is a view of the damper device shown in FIG. 1 as viewed from the direction of arrow II, in which the left baffle is open and the right baffle is closed in FIG.

FIG. 3 is a plan view illustrating an internal structure of a drive unit of the damper device illustrated in FIG.

FIG. 4 is a developed vertical sectional view of a driving unit shown in FIG. 3;

5A and 5B are schematic diagrams illustrating a relationship between a driving wheel, a cam body, and an operation lever of the driving unit illustrated in FIG. 3; FIG. 5A illustrates an example of a closed state, and FIG. 5B illustrates an example of an open state; It is a thing.

6A and 6B are schematic diagrams illustrating a relationship between a driving wheel and a projection of a driving unit illustrated in FIG. 3 and a first operation gear and a second operation gear, wherein FIG. 6A is an example of a closed state, and FIG. () Shows an example of the open state, and (C) shows another example of the closed state.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 2;

FIG. 8 is a circuit diagram showing a driving circuit of a stepping motor of the driving unit shown in FIG.

FIG. 9 is a diagram for explaining a state where the damper device of FIG. 1 is incorporated in a refrigerator.

10A and 10B are diagrams showing opening and closing operations of two baffles when the rotation angle of the driving wheel of the damper device shown in FIG. 1 is 0 °, and FIG. 10A shows one of the baffles, a gear pair, and an engagement portion; (B) is a diagram showing the relationship between the other baffle, the operating lever, and the cam body.

11A and 11B are diagrams illustrating opening and closing operations of two baffles when the rotation angle of the driving wheel of the damper device illustrated in FIG. 1 is 20 °, and FIG. 11A illustrates one baffle, a gear pair, and an engagement portion; (B) is a diagram showing the relationship between the other baffle, the operating lever, and the cam body.

12A and 12B are diagrams showing opening and closing operations of two baffles when the rotation angle of the driving wheel of the damper device shown in FIG. 1 is 100 °, and FIG. 12A shows one of the baffles, a gear pair, and an engagement portion; (B) is a diagram showing the relationship between the other baffle, the operating lever, and the cam body.

13A and 13B are diagrams showing opening and closing operations of two baffles when the rotation angle of the driving wheel of the damper device shown in FIG. 1 is 180 °, and FIG. 13A shows one of the baffles, a gear pair, and an engagement portion; (B) is a diagram showing the relationship between the other baffle, the operating lever, and the cam body.

14A and 14B are diagrams illustrating opening and closing operations of two baffles when the rotation angle of the driving wheel of the damper device illustrated in FIG. 1 is 260 °, and FIG. 14A illustrates one baffle, a gear pair, and an engagement portion; (B) is a diagram showing the relationship between the other baffle, the operating lever, and the cam body.

FIG. 15 is a diagram showing a relationship between the operation of the stepping motor of the damper device shown in FIG. 1, the rotation operation of the driving vehicle, and the opening and closing operation of the two baffles.

FIG. 16 is a rear view of a conventional motor type damper device.

FIG. 17 is a partial sectional side view of a conventional motor type damper device.

FIG. 18 is a view for explaining a state in which a conventional motor type damper device or double damper device is incorporated in a refrigerator.

FIG. 19 is a front view of a conventional double damper device. [Brief description of the drawings] 1 Double damper device 2 Drive unit 4 Opening 5a, 5b Baffle (opening / closing plate) 5c Shaft 7 Stepping motor (drive source) 9 Projection (engagement) 10 Drive wheel 11 Cam body 11c First feed portion 11d Second feed portion 12 First operating gear (one of gear pair) 12a Fitting recess (engaged portion) 12e Tooth portion 13 Second working gear (the other of gear pair) 13a Fitting recess ( 13c tooth portion 14 operating lever 14e gear portion 15 drive shaft (first drive shaft) 16 drive shaft (second drive shaft) 44 speed-up gear (transmission gear) 59 biasing spring (biasing means)

Claims (17)

[Claims] 1. A damper device having an opening / closing plate for opening and closing an opening, and a driving unit for driving the opening / closing plate, wherein the driving unit includes a driving source and an engagement rotatably driven by the driving source. A driving wheel having a portion, and a pair of gear pairs, each having an engaged portion that can be disengaged from the engaging portion and having a tooth portion that meshes with each other and rotationally driven by the driving wheel, One rotation of the gear pair generated by the drive wheel rotating while engaging the engagement portion with one of the engaged portions of the gear pair is transmitted to a shaft portion of the open / close plate. A damper device for opening and closing the opening and closing plate. 2. The driving wheel rotates one of the gear pairs to open and close the opening / closing plate, and then rotates the other of the gear pairs in the opposite direction by rotating the other of the gear pairs. 2. The damper device according to claim 1, wherein the opening / closing plate is closed from an open state. 3. The damper device according to claim 1, wherein the driving wheel includes a plurality of the engaging portions. 4. The damper device according to claim 1, wherein the drive source is a drive source for rotating the drive vehicle bidirectionally. 5. A damper device having an opening / closing plate for opening and closing an opening and a driving unit for driving the opening / closing plate, wherein the driving unit includes a driving source, and a cam body rotationally driven by the driving source. An operating lever, which is provided with a gear portion, is arranged to be disengageable from the cam body and is driven by engaging with the cam body, and a shaft of the opening / closing plate which meshes with the gear portion of the cam body. A transmission gear engaged with the opening and closing portion, and transmitting the rotation of the operation lever generated by rotating the cam body to the shaft portion of the opening and closing plate to perform the opening and closing operation of the opening and closing plate. Characteristic damper device. 6. The driving source for rotating the cam body bidirectionally, wherein the opening / closing plate is urged in a closing direction by an urging means. The described damper device. 7. The cam body has a first feed portion for mechanically rotating the operation lever in one direction when rotating in one direction, and mechanically moving the operation lever in the other direction when rotating in the other direction. The damper device according to claim 6, further comprising a second feeder for rotating the damper. 8. A damper device having two opening / closing plates for opening and closing two openings, and a driving unit for driving the two opening / closing plates, wherein the driving unit includes a driving source and the driving unit. A drive vehicle having an engagement portion that is rotationally driven by a source;
A pair of gear pairs each having an engaged portion which can be disengaged and engaged with each other and having tooth portions meshing with each other; and a first driving one of the open / close plates driven by one of the pair of gears. A drive shaft, a cam body rotationally driven by the drive source, an operation lever driven by engaging with the cam body, and a second drive shaft driven by the operation lever to drive the other of the open / close plate. And the drive source rotates the engagement portion and the cam body integrally with the drive vehicle to drive one or both of the first drive shaft and the second drive shaft, so that the two opening / closing plates are provided. Opening and closing operation of the damper. 9. The apparatus according to claim 8, wherein the two opening / closing plates are arranged at positions facing each other with the driving unit interposed therebetween.
The described damper device. 10. The driving wheel rotates one of the pair of gears to open one of the open / close plates from a closed state, and then rotates the other of the pair of gears to rotate one of the pair of gears in a reverse direction. The damper device according to claim 8, wherein one of the open / close plates is rotated from open to closed by rotating. 11. The damper device according to claim 8, wherein the drive wheel includes a plurality of the engaging portions. 12. The operating lever is urged to rotate in the closing direction, and when rotated by the cam body against the urge to rotate, the other of the open / close plates changes from closed to open. The damper device according to claim 8, 9, 10, or 11, wherein 13. The damper device according to claim 8, wherein the drive source is a drive source for rotating the drive vehicle and the cam body in two directions. . 14. The cam body has a first feed portion for mechanically rotating the operation lever to one side when rotating to one side to open the other of the open / close plates from closed to open, and 14. The damper device according to claim 13, further comprising: a second feed portion for mechanically rotating the operation lever to the other side during rotation to open and close the other of the open / close plates. 15. An open / close state of two open / close plates by switching an open / close state of the other open / close plate when one of the open / close plates is in an open state and a closed state. , And can be formed in at least four modes of closing, opening and closing.
15. The damper device according to 13 or 14. 16. The drive vehicle according to claim 8, wherein the cam body and the engaging portion are integrally formed.
The damper device according to 9, 10, 11, 12, 13, 14 or 15. 17. The damper device according to claim 16, wherein said cam body and said engaging portion are respectively provided on different surfaces of said driving wheel.