JP3452114B2 - 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 which uses a motor or the like as a drive source and operates an opening / closing plate such as a baffle with respect to an opening, and is particularly suitable for controlling intake of cold air in a refrigerator. Damper device.

[0002]

2. Description of the Related Art A conventional damper device, particularly a motor type damper device 70 for a refrigerator, has a baffle 72 and a drive mechanism 73 such as a motor sandwiching a rotary fulcrum shaft 71, as shown in FIGS. Is arranged (see Japanese Patent Laid-Open No. 6-109354). Then, while the engagement between the baffle 72 and the members in the drive mechanism unit 73 is loosened, the baffle 72 is provided behind the baffle 72.
Further, a leaf spring (not shown) that constantly presses in the closing direction of the baffle 72 is arranged in order to enhance the airtightness of the frame 74. In order to further improve the airtightness, the soft tape 7 is attached to the contact surface of the baffle 72 with the frame 74.
The baffle 72 completely closes the opening 76 so that the frame 74 is submerged.

Such a conventional motor type damper device 7
At 0, the rotation torque of the motor is converted into thrust direction torque by the spindle. The thrust direction torque of the spindle drives the baffle 72 to rotate about the rotation fulcrum shaft 71. As described above, since the torque in the rotational direction is changed to the torque in the thrust direction, the baffle 72 is considered in consideration of the accuracy of each component.
It is necessary to provide rattling when closing the. Moreover, because of this rattling, the baffle 7
It is necessary to hold down 2.

Further, the motor type damper device 70 having such a structure is used in the refrigerator 80 as shown in FIG. That is, the refrigerator 80 has a freezing room 81.
The refrigerator compartment 81 is divided into a refrigerator compartment 82 and a vegetable compartment 83.
An evaporator 84 is provided at the bottom of the. A fan motor 85 is provided at the rear of the evaporator 84, and the obtained cool air is circulated in the freezing chamber 81 and the refrigerating chamber 82 by blowing air.

A partition slope 86 is provided between the evaporator 84 and the refrigerating compartment 82 to block the cool air of the evaporator 84 from directly flowing into the refrigerating compartment 82. On the other hand, a cold airflow passage 87 is formed between the rear part of the partition slope 86 and the inner wall of the rear part of the refrigerator 80, and the motor type damper device 70 is disposed in the cold airflow passage 87. Then, when the baffle 72 of the motor type damper device 70 is in an open state, the cold airflow passage 87, which is a passage for cool air, is configured to be in a crank state. Further, the motor type damper device 70 is installed so as to be held by a partition wall 88 forming a part of the cold airflow passage 87.

[0006] Recently, with the development of a mid-freezer in a refrigerator, a refrigerator of a type in which the cool air obtained in the evaporator at the center is passed to a refrigerating room at an upper position and a remote 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 cold air at a right angle. Moreover,
In the refrigerator 80 using such a motor type damper device 70, since the cold airflow passage 87 has a crank shape, the cold airflow passage 87 becomes long and a loss occurs in terms of cold air transmission. This loss is extremely disadvantageous to a recent mid-freezer refrigerator because the cold airflow passage 87 is long. Moreover, since the cold airflow passage 87 has a crank shape, as shown in FIG.
The protrusion width M to the inside of the refrigerator 80 of 8 becomes large,
This is one of the factors that reduce 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, but FIG.
As shown in FIG. 5, the baffle 72 becomes a resistance against the flow of the cool air because it is opened only at an oblique position, which is not preferable for quick diffusion of the cool air. Also, regarding the motor type damper device 70 itself,
The width N of the drive mechanism portion 73 is increased, and that portion becomes a large dead space.

Further, such a motor type damper device 7
In the damper device used in a refrigerator or the like including 0, it is required to completely shut off cold air and the like when the baffle 72 is in the closed position. In addition, baffle 7
In the closed position of 2, it is necessary to prevent the baffle 72 or the like from freezing and locking with other portions. Further, the pressing force of the leaf spring has a strong force and is preferable for completely shutting off the cool air. However, since the pressing force of the spring greatly varies depending on the position of the baffle 72, stable operation of the drive mechanism unit 73 such as a motor is possible. 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 three rooms like the refrigerator 80 shown in FIG. 18 and a type in which the temperature of all the rooms is controlled. It is becoming. Therefore, FIG.
Further, a plurality of motor type damper devices 70 each 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 has a frame 7
Two opening portions 76, 76 are formed in 4, and the drive mechanism portion 73 such as a motor is arranged so as to be located on the lower side of the back surface. Then, two baffles 72 as shown in FIG. 16 and FIG. 17 are provided and driven by one synchronous motor (not shown) in the drive mechanism 73, and the openings 76, 76 are provided.
It is designed to open and close. In addition, this baffle 7
The operations of Nos. 2 and 72 are performed in four modes in which both are in the open position, both are in the closed position, one is in the open position and the other is in the closed position, and the other is in the open position and one is in the closed position.

[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
There is a tendency for a limit to occur in the opening angle of. Moreover, since the drive source for the operation of the baffle 72 in the closing direction is the leaf spring, it is difficult to ensure the reliability of the operation against freezing or the like.

Further, in the conventional double damper device 77 shown in FIG. 19, two baffles 72, 72 arranged on the upper side are driven by one synchronous motor in the drive mechanism section 73.
Therefore, there is a problem that the drive mechanism unit 73 including the spindle is inevitably increased in size. That is, in the double damper device 77, since the spindle abuts on the root side of each central portion of the baffles 72, 72, the distance R between the spindles becomes large, and therefore the drive mechanism section 73 must be large. It's something you can't get.

On the other hand, considering the miniaturization of the drive mechanism section 73, the distance P between the openings 76 is inevitable.
Tends to be smaller. When the distance P between the openings 76, 76 becomes smaller, the heat insulation between the cold airflow passages 87 connected to the openings 76, 76 becomes insufficient, and the influence of the temperature of the one cold airflow passage 87 affects the other cold airflow passage 87. Will appear in. For this reason, it is difficult to perform severe temperature control for each room.

The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a damper device capable of increasing the opening angle of the baffle and downsizing the drive mechanism portion. Further, the present invention provides a double damper having such an effect, that is, a damper device having two opening / closing plates for opening / closing two openings, in accordance with the recent technical tendency of refrigerators. The purpose is to do.

[0015]

In order to achieve such a problem, in the damper device according to claim 1, there is provided a damper device having an opening / closing plate for opening and closing the opening and a drive portion for driving the opening / closing plate. The drive unit includes a drive source, and a drive vehicle having an engagement unit that is rotationally driven by the drive source,
A pair of gears each having an engaging portion and an engaged portion that can be engaged and disengaged and having tooth portions that mesh with each other; One of the rotations of the gear pair generated by the rotation of the pair of engaged gears while being engaged with the engaged portion is transmitted to the shaft portion of the opening / closing plate to open / close the opening / closing plate.

According to the damper device of the second aspect, in addition to the invention of the first aspect, in the drive wheel, one of the gear pairs is rotated to open the open / close plate, and then the other of the gear pairs is opened. Is rotated to rotate one of the pair of gears in the opposite direction, thereby closing the opening / closing plate. Further, in the damper device according to claim 3, in addition to the invention according to claim 1 or 2, the drive vehicle includes a plurality of engaging portions. further,
In the damper device according to the fourth aspect, the drive source is for rotating and driving the drive vehicle in both directions.

Further, in view of the above-mentioned object, in the damper device according to the fifth aspect, in the damper device having an opening / closing plate for opening / closing the opening and a driving part for driving the opening / closing plate, the driving part is A drive source, a cam body that is rotationally driven by the drive source, a gear unit, and an operation lever that is arranged to be engageable with and disengageable from the cam body and that is driven by engaging the cam body; A transmission gear that meshes with the gear portion of the body and engages with the shaft portion of the open / close plate, and transmits the rotation of the operating lever generated by rotationally driving the cam body to the shaft portion of the open / close plate to open / close the plate. Opening and closing operation of.

Further, in the damper device according to the sixth aspect, in addition to the invention according to the fifth aspect, the drive source is a drive source for rotating the cam body in both directions, and the opening / closing plate is provided by a biasing means. It is biased in the closing direction. Further, 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 operating lever to one side when rotating in one direction, and the other. A second feed portion for mechanically rotating the operating lever to the other side when rotating in the direction.

Further, in view of the object of providing the double damper device as described above, the damper device according to claim 8 has two opening and closing plates for opening and closing two openings, and the two opening and closing plates. In a damper device having a drive unit for driving an opening / closing plate, the drive unit includes a drive source, a drive vehicle having an engagement unit that is rotationally driven by the drive source, and a engaged member that can engage and disengage the engagement unit. A pair of gear pairs each having a coupling portion and tooth portions that mesh with each other, a first drive shaft that drives one of the opening and closing plates by following one of the gear pairs, and a cam body that is rotationally driven by a drive source. And a second operating shaft which is driven by being engaged with the cam body and which drives the other of the opening and closing plates following the operating lever, and is integrally engaged with the driving vehicle by the driving source. Drive the first drive shaft and the second drive by rotating the drive section and the cam body. One or two of the opening and closing plate is driven both are opened and closed operation.

Further, in the damper device according to a ninth aspect of the present invention, in addition to the invention according to the eighth aspect, the two opening / closing plates are arranged at positions facing each other with the drive section interposed therebetween. According to a tenth aspect of the present invention, in addition to the eighth or ninth aspect of the damper device, the drive vehicle rotates one of the gear pairs to open one of the opening and closing plates and then to open the other of the gear pairs. By doing so, one of the pair of gears is rotated in the opposite direction and one of the opening and closing plates is opened to closed. Further, in the damper device according to an eleventh aspect, in addition to the invention according to the eighth, ninth or tenth aspect, the drive vehicle includes a plurality of engaging portions. Furthermore, in the damper device according to a twelfth aspect, in addition to the invention according to the eighth, ninth, tenth or eleventh aspect, the operation lever is rotationally biased in the closing direction and is rotationally biased by the cam body. When rotated against the other, the other of the opening and closing plates changes from closed to open.

Further, the damper device according to claim 13 is
In addition to the invention described in claims 8, 9, 10, 11 or 12, the drive source is a drive source for rotationally driving the drive wheel and the cam body in both directions. Furthermore, 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 the other side of the opening / closing plate from the closed state to the other side. The second feeding portion is provided for rotating the other side of the opening / closing plate from the open state to the closed state by rotating the same.

A damper device according to a fifteenth aspect of the present invention is
In addition to the invention according to claim 8, 9, 10, 11, 12, 13 or 14, when one of the opening and closing plates is in an open state and a closed state, the opening and closing state of the other opening and closing plate is switched. By doing so, the open / closed state of the two open / close plates is opened,
At least four modes of open / close, closed open, and closed can be formed. Furthermore, in the damper device according to claim 16, in addition to the invention according to claim 8, 9, 10, 11, 12, 13, 14 or 15, the drive vehicle has a cam body and an engaging portion integrated with each other. Has been formed. Further, claim 17
In the damper device described above, in addition to the invention described in claim 16, the cam body and the engaging portion are respectively provided on different surfaces of the drive vehicle.

In each of these damper devices, the power of a drive source such as a motor is transmitted to a baffle that serves as an opening / closing plate, and the baffle opens and closes with respect to an opening provided in the frame. In the damper device according to claims 1 to 4,
The pair of gears meshing with each other engages with the engaging portions of the drive wheels that are rotationally driven by the drive source, thereby transmitting one rotation of the pair of gears to the shaft portion of the open / close plate, and It is opening and closing. Therefore, the opening angle of the opening / closing plate can be increased by setting various specifications of the gear pair. In addition, since one rotation of the gear pair that transmits the driving force to the shaft portion is restrained by the driving wheel, it is possible to prevent a trouble such as freezing.

In the damper device according to the fifth to seventh aspects, the opening / closing plate is opened / closed by operating the operation lever via the cam body and the transmission gear wheel which are rotationally driven by the drive source. Therefore, by setting the engagement range of the cam body and the operation lever to be wide and setting the rotation angle of the operation lever to be large, the opening angle of the opening / closing plate can be set to be large. In addition, if the cam body is allowed to rotate bidirectionally and the cam body is provided with both a feed section that mechanically rotates the operating lever to one side and a feed section that rotates the other to the other side, the operating lever is mechanically operated in either direction. Therefore, troubles such as freezing can be prevented.

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 for these two opening / closing plates have different configurations, and one opening / closing plate uses the gear pair and the intermittent rotation mechanism to perform the opening / closing operation of the opening / closing plate at a short timing. The opening angle is increased. In the other opening / closing plate, the engagement range between the cam body and the operating lever is set to be wide, and the opening angle of the opening / closing plate is increased by increasing the turning angle of the operating lever. Further, when the open / close plate on the cam body side is in the open and closed states, the open / close plate on the gear pair side is driven to switch the open / closed state, whereby four modes of open / close, open / close, closed open, and closed / closed are selected. Since the two chambers can be formed, the temperature of the two chambers can be controlled by one damper device.

Further, when the drive unit is arranged between the opening and closing plates, a wide dead space as in the conventional case does not occur. Moreover, the place where the drive unit is arranged is a place where sufficient heat insulation is required, and if the drive unit is provided so as to be contained in the minimum space required for the heat insulation, no dead space is generated. Will be things.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a damper device of 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 opening / closing plates, each drive mechanism for driving each opening / closing plate is used independently.
It is also possible to use a single damper device.
Further, this double damper device is used in a refrigerator and is also a motor type 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 the frames 3 and 3. It is mainly composed of two openings 4 and 4 respectively formed in the above, and resin baffles 5a and 5b as two opening and closing plates for opening and closing the openings 4 and 4.

The drive unit 2 drives the two baffles 5a and 5b, and as shown in FIGS. 3 and 4, each member forming the drive unit 2 in the resin case body 6. Are arranged. That is, in the case body 6, a stepping motor 7 as a drive source, a reduction gear train 8,
Drive vehicle 10 having protrusions 9 and 9 as two engaging portions
And a cam body 11 formed integrally with the drive vehicle 10.
And a first pair of gears that can be engaged with the protrusions 9, 9.
The operating gear 12 and the second operating gear 13, the operating lever 14 engaged with the cam body 11, the drive shaft 15 as the first drive shaft for driving the baffle 5a, and the second drive shaft for driving the baffle 5b. A drive shaft 16 as a drive shaft is arranged.

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

The insertion hole 21 is formed in the side wall 3 of the one frame 3.
It is for inserting the four cylindrical fixing shafts 3b protruding from a. A receiving hole 3d for inserting the tapping screw 3c for fixing is formed at the tip of the fixed shaft 3b. On the other hand, the insertion hole 22 is for inserting the tapping screw 3c that advances into the fixing shaft 3b from the other frame 3 side.

That is, the insertion holes 21 and 22 are cylindrical fixing shafts when fixing the frames 3 and 3 arranged at positions facing each other with the drive unit 2 in between, to the drive unit 2. It is a hole for inserting 3b and the tapping screw 3c into the case body 6. And tapping screw 3c
The frames 3 and 3 are fixed to the case body 6 by inserting them into the insertion holes 22 and fixing them to the fixing shaft 3b. Further, the side wall portion 18 of the case body 6 has
As shown in FIG. 1, groove portions 23, 23 are provided,
In the groove 23, the engaging protrusions 2 each having a triangular cross section are provided.
3a and 23a are provided. This engaging projection 23a,
Reference numeral 23a locks the elastic engaging arm portions 3e, 3e provided on each frame 3 to drive the driving portion 2 of each frame 3, 3.
It is intended to secure the fixation against.

Further, the lid-like 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 hitting portion 25 for restricting the rotation of the first operating gear 12 and the operating lever 14 and for preventing them from being erroneously assembled. Further, the bottom surface portion 17 of the case body 6 is provided with a hole 26 for allowing the drive shaft 15 of the one baffle 5 a to project from the inside of the case body 6 to the outside.

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

The fixed shaft 30 is a metal shaft that is erected on the main plate 37, and the fixed shaft 31 is a metal shaft that is inserted and fixed in the bottom surface portion 17 of the case body 6, and the fixed shafts 32 and 33. , 3
The resin shafts 4, 35, 36 are integrally provided on the bottom surface portion 17 of the case body 6. The fixed shafts 33, 3
As shown in FIG. 4, the centers of 4, 35 and 36 are hollow shafts having cavities.

The fixed shafts 30, 31, 32 and 33 have a first reduction gear 38, a second reduction gear 39 and a third reduction gear 38 of the reduction gear train 8, respectively.
The reduction gear 40 and the fourth reduction gear 41 are rotatably supported. Further, the fixed shaft 34 is attached to the drive vehicle 10.
Is rotatably supported. The drive wheel 10 has protrusions 9 and 9 on the surface of the case body 6 facing the bottom surface portion 17, that is, the lower surface in FIG. Further, the drive vehicle 10 is integrally provided with a cam body 11 on a surface of the case body 6 facing the lid-shaped member 20, that is, an upper surface in FIG. That is, the cam body 11 and the projecting portions 9 and 9 as the engaging portions are integrally provided on different surfaces of the drive wheel 10, and are configured to rotate in synchronization.

On the fixed shaft 35, the operating lever 14 and the first operating gear 12, which is one of a pair of gears, are coaxially and rotatably supported. Further, the second operating gear 13, which is the other of the pair of gears, is rotatably supported on the fixed shaft 36. The first operating gear 12 and the second operating gear 13, which are a pair of these gears, mesh with each other and are configured to rotate in synchronization.

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

The stepping motor 7 has a fixed shaft 42, and a rotor 43 having a pinion 43a is rotatably fitted to the fixed shaft 42. That is, the pinion 43a of the stepping motor 7 meshes with the tooth portion 38a of the first reduction gear 38, which is the first stage of the reduction gear train 8, and the pinion portion 38b of the first reduction gear 38 has the second reduction gear 3
It is meshed with the tooth portion 39a of No. 9. The pinion portion 39b of the second reduction gear 39 meshes with the tooth portion 40a of the third reduction gear 40, and the pinion portion 40b of the third reduction gear 40 meshes with the tooth portion 41a of the fourth reduction gear 41. . Further, the pinion portion 41 of the fourth reduction gear 41
b meshes with the receiving tooth portion 10a of the drive wheel 10,
The reduction gear train 8 is thus operated by the stepping motor 7
Is transmitted to the driving vehicle 10 after decelerating its rotation.

The drive wheel 10 has the fitting hole 10b fixed to the fixed shaft 34.
It is rotatably supported on the case body 6 in both directions by being inserted into the case body 6. This drive vehicle 10 has a fourth outer circumference.
Toothed tooth portion 1 meshing with the pinion portion 41b of the reduction gear 41
0a, the cam body 11 is integrally formed on the axially upper surface, and the projections 9, 9 are integrally formed on the axially lower surface. Therefore, the driving force of the stepping motor 7 is
The speed is reduced by the reduction gear train 8 and the cam body 11 and the protrusions 9, 9
Is transmitted to the cam body 11 and the projections 9 and 9 by the bidirectional rotation of the stepping motor 7.

As shown in FIGS. 5A and 5B, the cam body 11 is arranged so that it can be engaged with and disengaged from the operating lever 14. The cam body 11 has a non-contact surface portion 11a formed by an arcuate surface having a small diameter so as not to engage with the operation lever 14, and an operation lever 1 formed by an arcuate surface having a large diameter.
4 and a cam surface 11b that is configured to engage with the No. 4 and a cam surface 11b that rises radially outward from the non-contact surface portion 11a.
And a first feeding portion 11c continuous with the first feeding portion 11c
And a second feeding portion 11d provided at a position separated by 160 ° in the circumferential direction. The second feeding unit 11
The d is formed by a convex portion having a larger diameter in the radial direction than the first feeding portion 11c, and the tip end portion thereof is located outside the cam surface 11b.

The operation lever 14 is rotatably supported by the case body 6 by inserting the fitting hole 14a into the fixed shaft 35. The operation lever 14 includes an engaging portion 14b that engages with the cam body 11, and rotation-regulating convex pieces 14c and 14d.
And a gear portion 14e that meshes with the tooth portion 44a of the speed increasing gear 44 as a transmission gear that rotates integrally with the drive shaft 16 of the other baffle 5b. As will be described later, since the drive shaft 16 is rotationally biased in the closing direction, the operation lever 14 is also rotationally biased in the closing direction (direction indicated by arrow C) accordingly. Further, the engagement portion 14b is formed of a convex piece formed so as 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.

Further, the rotation-regulating convex piece 14c has a structure in which the operation lever 14 is rotated in the B direction from the position shown in FIG. 5B by moving the baffle 5b by, for example, a human hand. The operation lever 14 and the speed increasing gear 44 are prevented from being disengaged from each other. That is, when the operation lever 14 tries to rotate in the B direction, the operation lever 14 interferes with the speed increasing gear 44 to regulate the rotation range of the operation lever 14. Also, the rotation-regulating convex piece 1
4d, when the operating lever 14 tries to rotate in the arrow C direction from the position shown in FIG. 5 (A), the operating lever 14 strikes against the hitting portion 25 provided on the case body 6 to regulate the rotation range of the operating lever 14. It has become. It should be noted that the rotation restriction convex piece 14d hits the hitting portion 25 to detect the rotation initial position (0 °) described later.

With this configuration, when the drive wheel 10 rotates in the direction of arrow A from the position shown in FIG. 5 (A), the cam body 11 rotates integrally with the drive 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 operation lever 14 is not engaged and the operation lever 14 does not operate. Therefore, the drive shaft 16 of the other baffle 5b is held in the closed position by the spring biasing force described later. Then, the driving vehicle 10 rotates by 160 ° and the cam body 11
When the first feeding portion 11c of 1 starts to contact the engaging portion 14b of the operating lever 14, the operating lever 14 is fed in the direction of arrow B.

At this time, the operating lever 14 moves the speed increasing gear 4
4 is rotated to rotate the drive shaft 16 from the closed position to the open position. Further, when the drive wheel 10 rotates in the same direction, the operating lever 14 rides on the cam surface 11b of the cam body 11 and holds its position in a positional relationship as shown in FIG. Will be done. Then, even if the cam body 11 rotates in the direction of arrow A while the operation lever 14 rides on the cam surface 11b, the operation lever 1
4 does not work. That is, in the range where 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 operating lever 14 rides on the cam surface 11b and from that state, the drive wheel 10 rotates further 80 ° in the direction of arrow A until it reaches the state shown in FIG. 5B. The restricting convex piece 14c interferes with the speed increasing gear 44. As a result, the rotation angle of the operation lever 14 in the arrow B direction is restricted. In this embodiment, the stepping motor 7 is set to start reverse rotation when it rotates in a positive direction of a predetermined rotation range (260 °), and accordingly, the operation lever 14 rotates reversely. Becomes

From the positional relationship shown in FIG.
When 0 reversely rotates in the arrow D direction, 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 drive wheel 10 rotates 80 ° in the direction of the arrow D, the operation lever 14 is disengaged from the cam surface 11b and disengaged from the cam body 11. Then, the operation lever 14 is rotated by the rotational urging force in the arrow C direction,
It will rotate in the direction of arrow C. That is, drive shaft 1
The biasing force for rotating 6 is transmitted to the operation lever 14 via the speed increasing gear 44, and rotates the operation lever 14 in the arrow C direction. Then, the drive shaft 16 is held in the closed position in the range where the operation lever 14 does not contact the cam surface 11b and faces the non-contact surface portion 11a.

Even if the operating lever 14 is disengaged from the cam surface 11b, it may not rotate in the C direction at the position shown in FIG. 5B due to icing or the like. The operation lever 14 is mechanically rotated in the direction of arrow A by feeding while the second feeding portion 11d is in contact with the joining portion 14b.

Further, from the position shown in FIG.
0 rotates in the direction of arrow D, and the second feeding portion 11d engages with the engaging portion 1
When the operation lever 14 is fed in the direction of arrow C while abutting against 4b, the rotation restricting convex piece 14d abuts against the hitting portion 25, so that the rotation angle of the operation lever 14 is restricted. When the operation lever 14 hits the hitting portion 25 and its rotation is restricted in this manner, the stepping motor 7 recognizes its 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 and 9 as the engaging portions are integrally formed on the lower surface of the drive wheel 10 in FIG. 4, so that they can rotate integrally with the drive wheel 10. There is. As shown in FIGS. 6 (A), 6 (B) and 6 (C), the projections 9 and 9 are each formed of a projection-shaped member that extends radially outward from the center of rotation of the drive wheel 10. The tip portion is formed in an arc shape. And
The drive wheel 10 can be engaged with the first operating gear 12 by inserting the leading end portion into the fitting recess 12 a as the engaged portion of the first operating gear 12. That is, the drive wheel 10 rotates and drives the first operating gear 12 by rotating one of the protrusions 9, 9 while engaging the first operating gear 12.

The first operating gear 12 meshes with the second operating gear 13, and the first operating gear 12 will be described later.
The fitting concave portion 12a and the fitting concave portion 13a as the engaged portion of the second operation gear 13 are line-symmetrical to each other. for that reason,
When the drive wheel 10 rotates while engaging the protrusions 9 and 9 with the first operating gear 12, the second operating gear 13 also rotates in synchronization and comes to a position where the fitting recesses 12a and 13a contact each other. Therefore, the protrusions 9 and 9 have the fitting recess 12a.
When the first operating gear 12 is rotated by a predetermined angle, the fitting recess 13a of the second operating gear 13 is immediately rotated.
It is designed to get inside.

The projections 9 and 9 have their tips inserted into the fitting recess 13a of the second operating gear 13,
It engages with the second operating gear 13. In this way, the protrusions 9, 9
By rotating the drive wheel 10 while one of them is engaged with the second operation gear 13, the second operation gear 13 is rotationally driven. When the second operating gear 13 rotates, the first operating gear 12 rotates synchronously and rotates to the original position. In this embodiment, each range in which the drive wheel 10 rotates while the projections 9 and 9 are engaged with the first operation gear 12 and the second operation gear 13 is 80 °, and one projection 9 and the other protrusion 9 are 1 in the circumferential direction.
It is provided at a position separated by 60 °.

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 into the fixed shaft 35. ing. The first operating gear 12 has a shape in which two large-diameter fan gears 12c having different diameters and a small-diameter fan gear 12d are integrally arranged in the circumferential direction.

A tooth portion 12e for meshing with the second operating gear 13, which is the other of the gear pair, is formed in a section from the vicinity of the other end in the circumferential direction of the outer peripheral edge of the large-diameter fan gear 12c to the middle portion. There is. Further, fitting as an engaged portion formed so that the projections 9 and 9 are inserted into and engaged with a portion of the large-diameter fan-shaped gear 12c in the vicinity of one end in the circumferential direction of the outer peripheral edge, where the tooth portion 12e is not present. A recess 12a is formed. This fitting recess 12a
Is formed at a position corresponding to the fitting recess 13 a of the second operation gear 13. On the other hand, on the outer peripheral edge of the small diameter fan gear 12d, a gear portion 12h that meshes with a tooth portion 45a of a speed increasing gear 45 that rotates integrally with the drive shaft 15 of the one baffle 5a.
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 into the fixed shaft 36. The second operating gear 13 is formed of a fan gear, and a tooth portion 13c for meshing with a tooth portion 12e of the first operating gear 12 is provided in a section from the vicinity of the other end in the circumferential direction of the outer peripheral edge to the middle portion. Are formed. Therefore, the second operating gear 13 is
When the operating gear 12 rotates, it will rotate in synchronization.

Further, the tooth portion 13 is formed near one end in the circumferential direction of the outer peripheral edge.
In a portion without c, a fitting recess 13a as an engaged portion is formed in a notch shape so that the projections 9 enter and engage with each other. For this reason, when the drive wheel 10 rotates while the projections 9, 9 are inserted into the fitting recess 13a, the second operating gear 13 rotates and the first operating gear 12 rotates in synchronization. The fitting recess 13a is
It is provided at a position corresponding to the first operating gear 12a,
At the position shown in FIG. 6 (B), the protrusions 9 and 9 extend from the fitting recess 12 a of the first operating gear 12 to the second operating gear 13.
Can be moved to the fitting recess 13a or vice versa.

With such a configuration, the first operating gear 12
6B from the position where the driving vehicle 10 is shown in FIG. 6A.
When it is rotated 100 ° in the direction of the arrow A to the position shown in FIG. 1, one of the protrusions 9 enters into the fitting recess 12a and is engaged therewith to be rotated by the drive wheel 10. By this operation, the first
The operating gear 12 transmits the rotational force of the drive 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 also to rotate the second operating gear 13. There is. 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 drive wheel 10 further rotates in the direction of arrow A, the drive wheel 10 moves one of the protrusions 9 into the fitting recess 13a of the second operation gear 13 to move the second operation gear 13. Start driving. When the drive wheel 10 engages with the second operating gear 13 in this manner and rotates 80 ° in the direction of arrow A from the position shown in FIG. 6 (B) to the position shown in FIG. 6 (C), the second operating gear First synchronized with rotation of 13
The operating gear 12 will return to the original position. That is,
The fitting recess 12a of the first operating gear 12 and the second operating gear 13
With respect to the fitting recess 13a, the positional relationship is the farthest. By this operation, the first operating gear 12 rotates the drive shaft 15 of the one baffle 5a from the open position to the closed position. When the drive wheel 10 rotates 180 ° in the direction of arrow A from the position shown in FIG. 6 (A) to the position shown in FIG. 6 (C), the other of the protrusions 9 advances into the fitting recess 12 a of the first operating gear 12. Will begin to do.

When the drive wheel 10 is further rotated 80 ° in the direction of arrow A from the position shown in FIG. 6C, the baffle 5a abuts the opening 4 and the number of steps from the initial position of 0 ° is increased. It becomes a predetermined value, and the stepping motor 7 stops. As the operation during this period, the first operation gear 1
2 and the second operating gear 13 are engaged with each other by recesses 12a, 13
When a is moved closer, one drive shaft 15 is rotated 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. If the baffle 5a is rotated by a human hand or the like, the drive vehicle 10
Tries to rotate further in the direction of arrow A, but the cam body 11
The protruding portion in the radial direction hits the engaging portion 14b and is prevented from rotating any further.

When the drive wheel 10 starts to rotate in the direction indicated by the arrow A for a total of 260 ° and then starts to rotate in the reverse direction, an operation opposite to the operation described above starts. That is, from the positional relationship in which the fitting recesses 12a and 13a are close to each other, the drive wheel 10 rotates in the direction of the arrow D while engaging the other of the protrusions 9 with the fitting recess 12a, and the fitting recesses 12a and 13a are the highest. First to be in a distant position
The operating gear 12 is driven. The rotation angle of the driving vehicle 10 during this period is 80 °. Then, the positional relationship shown in FIG. 6C is obtained, and the drive shaft 15 is rotated to the closed position. Further, when the drive wheel 10 rotates from the position shown in FIG. 6 (C) to the position shown in FIG. 6 (B), the fitting recesses 12a, 13 are formed.
a is again approaching, and the drive shaft 15 is again rotated to the open position. Further, FIG. 6 (B) to FIG. 6 (A)
When the drive 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. In detail, the position where the drive vehicle 10 is rotated by 20 ° in the direction of arrow A from the position shown in FIG.
It rotates to the initial position (0 °).

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

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 pin 49 is 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 substrate 55. The lead wire 57 is taken out from a notch 58 formed in the side wall portion 18 of the case body 6.

The frames 3 and 3 are shown in FIGS. 1, 2 and 7, respectively.
As shown in, it has a thin prismatic shape. An opening 4 is formed inside the frames 3 and 3, and shafts 5c and 5c that engage with the drive shafts 15 and 16 of the baffles 5a and 5b are housed, respectively. The drive shafts 15 and 16 and the shaft portions 5c and 5c are provided on both sides of each frame 3.
Side walls 3a supporting the drive shafts 15 and 16 on the case body 6 side are through holes 3f and 3f. On the other hand, the other ends of the shaft portions 5c, 5c are fitted into a bottomed hole 3g provided in the side wall 3a and are rotatably supported. The engaging portions of the drive shafts 15 and 16 and the shaft portions 5c and 5c are oval-shaped and are engaged with a slight rotational play.

Further, the side wall 3 on the center side of one frame 3
Four fixing shafts 3b for fixing the frames 3 to each other with the driving unit 2 sandwiched therebetween are projected from a. Receiving holes 3d are formed at the tip of these fixing shafts 3b. Then, the fixing shaft 3b is inserted into the insertion hole 21 provided in the bottom surface portion 17 of the case body 6. In addition, a tapping screw 3c for advancing into the receiving hole 3d of the fixing shaft 3 and fixing both the frames 3 and 3 to the drive unit 2 is inserted through the side wall 3a on the center side of the other frame 3. There are four screw insertion holes 3h. With this configuration, both frames 3 and 3 are fixed so as to sandwich the case body 6 forming the drive unit 2.

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

With this configuration, the baffles 5a and 5b are
Is forcibly urged in the direction of arrow A in FIG. 7, that is, in the closing direction with the shafts 5c, 5c 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 operating lever 14 is urged to rotate in the arrow C direction. Therefore, the operation lever 14 is adapted 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 serves as a drive source that rotates the drive shaft 16 in the closing direction. Even if the operation lever 14 does not rotate in the closing direction due to freezing or the like, the second feeding portion 11d of the cam body 11 does not move the operation lever 14.
The operating lever 14 is rotated in the closing direction by hitting the engaging portion 14b. This ensures that the baffle 5b is closed even if icing or the like occurs.

On the other hand, the drive shaft 15 and the speed increasing gear 45 on the side of the baffle 5a are also always urged to rotate in the closing direction. When the baffle 5a is in the closed state, the protrusions 9 and 9 are not engaged with the first operating gear 12 and the second operating gear 13, that is, they are in a rattling state. This means that the rotational driving force is not transmitted. With such a configuration, the baffles 5a and 5b are
In the completely closed state, the urging force of the urging spring 59 results in the closed state.

A soft tape 60, which serves as a cushioning member, is fixed to the opening 4 side of the baffles 5a and 5b.
It constitutes a part of a and 5b. The baffle 5a,
Ribs may be provided on the back surface side of 5b in order to maintain the strength of the baffles 5a and 5b. Also, baffle 5
The a and 5b are rotatable about the drive shafts 15 and 16 as fulcrums, and open and close in the direction A or B shown by the arrow in FIG. The soft tape 60 is made of foamed polyurethane so that the amount of depression when the soft tape 60 comes into contact with the protruding portion 4c is large, but other elastic members such as foamed polyethylene or a rubber member may be used.

The circuit configuration of the stepping motor 7 is shown in FIG.
It is as shown in. That is, the two windings 61
, 8 transistors 62, and 8 diodes 63
And each element is arranged symmetrically so as to be driven by bipolar.

The double damper device 1 thus constructed is incorporated in a refrigerator 64 or the like, which is a mid-freezer as shown in FIG. 9, for example. Here, the same members as those shown in FIG. 16 are designated by the same reference numerals, and the description thereof will be omitted. This refrigerator 64 is a mid-freezer refrigerator,
A freezer compartment 81 is provided in the center, a refrigerating compartment 82 is provided in the upper part, and a vegetable compartment 83 is provided in the lower part. A duct 65 for blowing cool air to the refrigerating compartment 82 is formed, and the double damper device 1 is fitted in a portion of the duct 65 communicating with the refrigerating 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 arranged at the inlet of the duct 65, in other words, at the outlet 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 drive vehicle 10 is shown in FIGS.
4 and the operation explanatory diagram shown in FIG. 15. In FIG. 10, the rotation angle of the drive vehicle 10 is 0 °.
In the state, (A) shows the opened / closed state of the baffle 5a, and (B) shows the opened / closed state of the baffle 5b. Also,
Similarly, FIG. 11 shows the drive vehicle 10 in the 20 ° state, FIG. 12 shows the drive vehicle 10 in the 100 ° state, and FIG.
In the 80 ° state, FIG. 14 is the 260 ° state of the driving vehicle 10, (A) of 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 shown respectively.

First, after the double damper device 1 is installed in the refrigerator 64, the initial setting is performed by the following method. That is, the stepping motor 7 is rotated in the opposite direction to rotate the cam body 11 and the projections 9 and 9 integrally with the drive wheel 10. Then, the operation lever 14 is rotated by being sent to the second feeding portion 11d of the cam body 11,
As shown in (B), the operation lever 14 is locked by abutting the rotation restricting convex piece 14d against the hitting portion 25 provided on the case body 6, and the drive vehicle 10 is also locked. In addition,
At this time, the stepping motor 7 is made to output the drive signal of the number of steps capable of rotating over 0 °. As described above, in the present embodiment, the stepping motor 7 outputs an extra drive signal from the state where the drive vehicle 10 is locked, so that the initial setting position (0 °) is set.
Is being detected.

At this initial setting position (0 °), as shown in FIG.
Baffles 5a and 5b as shown in (A) and (B)
Both are closed. In addition, in this embodiment,
As shown in FIGS. 11A and 11B, the initial setting position (0
B) 5 a, 5 b
Both b 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 rotational urging force of the urging spring 59 causes the baffles 5a, 5b.
Is rotationally biased in the closing direction.

From such a state, the CPU or the like for controlling the temperature inside the refrigerator 64 by the operation of the refrigerator 64 issues an instruction to the double damper device 1 to introduce cold air into the chamber 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. It In the present embodiment, as shown in FIG. 15, the baffle 5 is changed depending on the rotation angle of the drive wheel 10.
The open / closed states of a and 5b are controlled respectively.

That is, the drive wheel 10 is rotated by 80 ° in the positive direction from the position (20 °) shown in FIGS. 11A and 11B, and the position (100) shown in FIGS.
(°), the cam body 11 does not engage with the operation lever 14 and idles. Therefore, the operating lever 14 does not rotate, and the baffle 5b remains in the closed state. During this time, one of the protrusions 9 is fitted into the fitting recess 1 of the first operating gear 12.
The first operating gear 12 rotates by rotating while entering into 2a.

Then, in synchronization with the first operating gear 12, the second gear
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 recesses 12a, 13a are brought close to each other. Then, the tooth portion 12 of the first operating 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, the baffle 5a is switched from the closed state to the open state while the baffle 5b is maintained in the closed state, and both the baffles 5a and 5b are changed from the closed / closed mode to the open / closed mode.

Further, the drive wheel 10 is further rotated 80 ° from the position (100 °) shown in FIGS. 12 (A) and 12 (B), and the position shown in FIGS. 13 (A) and 13 (B) ( 1
80 °), during that time, the first feeding portion 1 of the cam body 11
1c contacts the engaging portion 14b of the operating lever 14 to feed the moving lever 14, so that the operating lever 14 moves in the direction of arrow B in FIG. 13 (B).
It will rotate in the direction. Then, the speed increasing gear 44 engaged with the gear portion 14e of the operation lever 14 moves the drive shaft 16
The baffle 5b is rotated integrally with the baffle 5b and is rotated in the opening direction. In addition, the operation lever 14 further includes 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 period, one of the protrusions 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 into the fitting recess 13a. , The second operating gear 13 is rotated. Then, the first operating gear 12 rotates in synchronization with the second operating gear 13, and as shown in FIG. 13A, the first operating gear 12 and the second operating gear 13 are fitted into the fitting recesses 12a, 13a.
Are separated 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 changes to
Both baffles 5a, 5 are rotated together from the open state to the closed state.
b is changed from the open / close mode to the closed / open mode.

Further, the driving vehicle 10 is further shown in FIG.
And when rotated from the position (180 °) shown in (B) and 80 ° in the positive direction to the position (260 °) shown in FIGS. 14 (A) and (B), the cam body 11 operates during that time. The engaging portion 14b of the lever 14 rotates idly while contacting the cam surface 11b. Therefore, the operating lever 14
Does not rotate and the baffle 5b remains open. On the other hand, one of the protrusions 9 is disengaged from the fitting recess 13a of the second operating gear 13 during this time, and the other of the protrusions 9 enters the fitting recess 12a of the first operating gear 12 instead. Come on. Then, the other of the protrusions 9 rotates the first operating gear 12.

Then, in synchronization with the first operating gear 12, the second gear
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 into the fitting recess 12a,
The positional relationship is such that 13a is brought closer. Then, the speed increasing gear 4 engaged with the tooth portion 12e of the first operating 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 remains open, the baffle 5a
The baffles 5a and 5b by switching the closed state to the open state.
Is changed from closed open mode to open open mode.

When the driving wheel 10 is rotated from the initial position (0 °) to the position of 260 ° as shown in FIGS. 14 (A) and 14 (B), the stepping motor 7 is rotated in the reverse direction. It is set. When the drive wheel 10 is rotated in the reverse direction by the stepping motor 7, the baffles 5a and 5b are reversed in the opposite order every time the drive wheel 10 is rotated by 80 °.
Sequentially executes the above-mentioned modes.

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

The drive wheel 10 is further rotated in the opposite direction from the position of 20 °, and the second feed portion 11d of the cam body 11 is rotated.
The operating lever 14 is rotated by means of the rotation restricting convex piece 14d of the operating lever 14 to abut against the hitting portion 25. At this time, the stepping motor 7 outputs an extra drive signal to rotate the drive vehicle 10 mechanically. By mechanically locking, the position of the initial rotation position 0 ° of the driving vehicle 10 is detected.

Here, the movement of the baffles 5a and 5b among the four modes, such as the transition from the open / closed position to the open / open position and the transition from the closed / closed position to another position, is performed by the stepping motor 7
It is possible to freely carry out by detecting and controlling the number of steps and the rotation direction.

Here, the moving time of the baffles 5a and 5b from the open position to the closed position and in the opposite direction is controlled by the pulse generation rate. It is also possible to stop the baffles 5a and 5b in the middle of opening and closing instead of the completely open position. The movement angle from the open position to the closed position is 45 ° in this embodiment, but other angles can be appropriately adopted.

In this embodiment, since the opening 4 is formed vertically to the frame 3, the thickness of the frame 3 can be reduced. For this reason, the entire device including the frame 3 becomes small, and the double damper device 1 can be easily attached to another device, for example, a refrigerator. Further, since the open positions of the baffles 5a and 5b are set to be substantially parallel to the frames 3 and 3, the cold air flowing along the frames 3 and 3 in the open state is baffles 5a and 5b.
There is almost no obstruction by 5b or the openings 4 and 4, and it flows straight. Therefore, there is no loss of cold air transmission, and the refrigerator has high efficiency of cold air transmission and cold air diffusion.

Further, in this embodiment, the baffle 5 can be reliably operated even though the control is performed by the number of pulses.
It is possible to bring a and 5b to the closed position or the open position.
That is, when the baffles 5a and 5b do not operate once due to stray time of the stepping motor 7 or freezing of the baffles 5a and 5b, a reliable closing operation or opening operation cannot be performed, but in this embodiment, Cam body 11, operating lever 14, protrusions 9 and 9, first operating gear 12 and second
By using the mechanism in which the operating gear 13 is reliably brought into contact with and fed, it is possible to mechanically ensure the closed position or the open position. For this reason, malfunctions due to freezing and unintended cold air leakage do not occur.

In addition, the meshing portion of the first operating gear 12, the tooth portion 12e, and the tooth portion 45a of the speed increasing gear 45, 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 operating angles of a and 5b can be increased. In addition,
In this embodiment, the operating angle is 45 °.

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 gist of the present invention. is there. For example, only a mechanism for operating the baffle 5a can be taken out to be a single damper that drives one baffle, or a single damper that similarly uses a mechanism for operating the baffle 5b can be used.

Further, in the above-mentioned embodiment, the stepping motor 7 is bidirectionally rotated, but the operation lever 14 is used.
With the configuration in which the protruding portion of the cam body 11 that abuts on is removed, four modes can be obtained even if the stepping motor 7 is rotated only in one direction. In this case, the closing operation on the baffle 5b side completely depends 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 accelerated by the speed increasing gear 45 and transmitted to the drive shaft 15 to drive the baffle 5a. Although the rotation angle of the shaft 15 is made larger, one end of the drive shaft 15 is directly fixed to the rotation center of the first operating gear 12 and the speed increasing gear 45 is omitted if not particularly required. 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 opening 4 of the baffles 5a and 5b which comes into contact with the projecting portion 4c. However, when the tightness of the baffles 5a and 5b is not strictly required, the soft tape 60 is omitted. May be. further,
Although the reduction gear train 8 is used in the above-described embodiment,
The reduction gear train 8 is not always necessary. Further, as the driving method of the stepping motor 7, other driving methods such as unipolar driving can be appropriately adopted in addition to bipolar driving, and various specifications such as step angle and torque can be various values according to the usage form and the like. Can be adopted.

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

Further, instead of the stepping motor 7, D
Other drive sources such as a C motor or an AC synchronous motor may be used. In that case, the drive source may be a unidirectional rotation only if it is not limited to the above-mentioned four modes.

[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 which is 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 pair of gears meshing with each other engages with an engaging portion of a drive wheel that is rotationally driven by a drive source, thereby forming a pair of gears. One of the rotations is transmitted to the drive shaft to open / close the open / close plate. Therefore, the gear pair and the intermittent mechanism can be used to open / close the opening / closing plate at a short timing and increase the opening angle. In addition, since the rotation of one of the pair of gears that transmits the driving force to the drive shaft is restricted by the drive 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 operation lever via the cam body and the transmission gear that are rotationally driven by the drive source. Therefore, by setting the engagement range of the cam body and the operation lever to be wide and setting the rotation angle of the operation lever to be large, the opening angle of the opening / closing plate can be set to be large. In addition, if the cam body is allowed to rotate bidirectionally and the cam body is provided with both a feed section that mechanically rotates the operating lever to one side and a feed section that rotates the other to the other side, the operating lever is mechanically operated in either direction. Therefore, the opening / 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 for these two opening / closing plates have different configurations, and one opening / closing plate can increase the opening angle of the opening / closing plate by setting various specifications of the gear pair. The opening and closing plate of the other opening and closing plate can be set large by setting the engagement range of the cam body and the operating lever to be wide and setting the rotation angle of the operating lever to be large. Moreover, the opening and closing timings of the two mechanisms are shifted so that when the opening and closing plate on the cam body side is in the open and closed states, the opening and closing plate on the gear pair side is driven to switch between the opening and closing states. Multiple modes can be set by shifting the opening and closing of.

Further, the dead space can be reduced by providing the driving portion between the two opening / closing plates. Moreover, since the distance between the two openings can be lengthened by disposing the driving unit, the heat insulating effect is enhanced and severe temperature control can be performed. Further, since the drive unit is provided between the opening / closing plates, it becomes easy to transmit the operation to each of the opening / closing plates, and the distance between the openings can be set more freely than in the conventional case. For this reason, the mechanism of the drive unit can be simplified, and the design according to the heat insulation effect can be facilitated, and the air duct design can be facilitated.

[Brief description of drawings]

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

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

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

FIG. 4 is a developed vertical sectional view of the drive unit shown in FIG.

5A and 5B are schematic diagrams showing the relationship between the drive wheel and the cam body of the drive unit shown in FIG. 3 and the operating lever. FIG. 5A shows an example of a closed state and FIG. 5B shows an example of an open state. It is a thing.

6 is a schematic diagram showing a relationship between a drive wheel and a protrusion of the drive unit shown in FIG. 3, and a first operating gear and a second operating gear, in which (A) is an example of a closed state and (B) is ) Is an example of an open state, and (C) shows another example of a closed state.

7 is a sectional view taken along line VII-VII in FIG.

8 is a circuit diagram showing a drive circuit of the stepping motor of the drive section shown in FIG.

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

10 is a diagram showing an opening / closing operation of two baffles when the rotation angle of the drive vehicle of the damper device shown in FIG. 1 is 0 °, and (A) shows one baffle, a gear pair, and an engaging portion. 3B is a diagram showing the relationship between the other baffle and the operating lever and the cam body.

11 is a diagram showing an opening / closing operation of two baffles when the rotation angle of the drive vehicle of the damper device shown in FIG. 1 is 20 °, and FIG. 11 (A) shows one baffle, a gear pair, and an engaging portion. 3B is a diagram showing the relationship between the other baffle and the operating lever and the cam body.

FIG. 12 is a diagram showing an opening / closing operation of two baffles when the rotation angle of the drive vehicle of the damper device shown in FIG. 1 is 100 °, and (A) shows one baffle, a gear pair, and an engaging portion. 3B is a diagram showing the relationship between the other baffle and the operating lever and the cam body.

13 is a diagram showing an opening / closing operation of two baffles when the rotation angle of the drive vehicle of the damper device shown in FIG. 1 is 180 °, and FIG. 13 (A) shows one baffle, a gear pair, and an engaging portion. 3B is a diagram showing the relationship between the other baffle and the operating lever and the cam body.

FIG. 14 is a diagram showing an opening / closing operation of two baffles when the rotation angle of the drive vehicle of the damper device shown in FIG. 1 is 260 °, and (A) shows one baffle, a gear pair, and an engaging portion. 3B is a diagram showing the relationship between the other baffle and the operating lever and the cam body.

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

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

FIG. 17 is a partial cross-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 drawings] 1 double damper device 2 drive 4 openings 5a, 5b Baffle (opening and closing plate) 5c shaft 7 Stepping motor (drive source) 9 Projection (engagement part) 10 driving car 11 cam body 11c 1st feeding part 11d Second feeding section 12 First operating gear (one side of gear pair) 12a Fitting recess (engaged part) 12e Teeth 13 Second operating gear (the other side of the gear pair) 13a Fitting recess (engaged part) 13c teeth 14 Operation lever 14e Gear part 15 Drive shaft (first drive shaft) 16 Drive shaft (second drive shaft) 44 Speed increasing gear (transmission gear) 59 Biasing spring (biasing means)

Claims (17)

(57) [Claims] 1. A damper device having an opening / closing plate for opening / closing an opening and a driving unit for driving the opening / closing plate, wherein the driving unit includes a driving source and an engagement rotationally driven by the driving source. A drive wheel having a portion, and a pair of gears each having a toothed portion that includes an engaged portion that can be engaged with and disengaged from the engagement portion, and that has tooth portions that mesh with each other, 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 the shaft portion of the opening / closing plate. A damper device for opening and closing the opening and closing plate. 2. The drive wheel rotates one of the pair of gears to rotate one of the pair of gears in a reverse direction by rotating one of the pair of gears to close and open the opening / closing plate and then rotating the other of the pair of gears in the opposite direction. The damper device according to claim 1, wherein the opening and closing plate is opened to close. 3. The damper device according to claim 1, wherein the drive vehicle includes a plurality of the engaging portions. 4. The damper device according to claim 1, wherein the drive source is a drive source for rotationally driving the drive wheel in both directions. 5. A damper device having an opening / closing plate for opening / 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. And a gear part is provided, and an operating lever which is arranged to be engageable with and disengageable from the cam body and is driven by engaging with the cam body, and a gear part of the cam body are meshed with each other, and a shaft of the opening / closing plate is engaged. A transmission gear that engages with the shaft, and transmits the rotation of the operating lever generated by rotationally driving the cam body to the shaft portion of the opening / closing plate to open / close the opening / closing plate. Characteristic damper device. 6. The drive source is a drive source for rotating the cam body in both directions, and the opening / closing plate is biased in a closing direction by biasing means. The described damper device. 7. The cam body includes a first feeding portion for mechanically rotating the operation lever to one side when rotating in one direction, and a mechanical movement of the operation lever to another direction when rotating to the other side. The damper device according to claim 6, further comprising a second feed portion for rotating the damper. 8. A damper device having two opening / closing plates for opening / closing two openings and a drive unit for driving the two opening / closing plates, wherein the driving unit includes a drive source and the drive unit. A drive vehicle having an engaging portion that is rotationally driven by the source;
A pair of gear pairs, each of which includes an engaged portion that can be engaged and disengaged from each other and a tooth portion that meshes with each other, and a first pair that drives one of the opening and closing plates by following one of the pair of gears. A drive shaft, a cam body that is rotationally driven by the drive source, an operating lever that is driven by engaging with the cam body, and a second drive shaft that follows the operating lever and drives the other of the opening and closing plates. And the two opening / closing plates for driving one or both of the first drive shaft and the second drive shaft by rotationally driving the engagement portion and the cam body integrally with the drive vehicle by the drive source. A damper device that opens and closes. 9. The two opening / closing plates are arranged at positions facing each other with the driving unit interposed therebetween.
The described damper device. 10. The drive wheel rotates one of the pair of gears to open one of the opening and closing plates from closed to open, and then rotates the other of the pair of gears to reverse one of the pair of gears. The damper device according to claim 8 or 9, wherein one of the opening and closing plates is rotated to open and close the opening and closing plate. 11. The damper device according to claim 8, 9 or 10, wherein the drive vehicle includes a plurality of the engaging portions. 12. The operation lever is urged to rotate in a closing direction, and when the cam body is rotated against the urging force of rotation, the other of the opening and closing plates is changed from closed to open. The damper device according to claim 8, 9, 10, or 11. 13. The damper device according to claim 8, wherein the drive source is a drive source for rotationally driving the drive wheel and the cam body in both directions. . 14. The cam body includes a first feed portion for mechanically rotating the operation lever to one side to rotate the other side of the opening / closing plate from closed to open, and to the other side. 14. The damper device according to claim 13, further comprising a second feeding portion for mechanically rotating the operation lever to the other side during rotation to open the other side of the opening / closing plate from the open state. 15. When one of the opening and closing plates is in the open state and the closed state, the opening and closing state of the two opening and closing plates is opened and closed by switching the opening and closing state of the other opening and closing plate. And at least four modes of closed, closed, and closed can be formed.
The damper device according to 13 or 14. 16. The cam body and the engagement portion are integrally formed in the drive wheel.
The damper device according to 9, 10, 11, 12, 13, 14 or 15. 17. The damper device according to claim 16, wherein the cam body and the engagement portion are provided on different surfaces of the drive vehicle, respectively.