JPH09184673A - Motor driven type damper device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the position of a buffle to be held with a slight force. SOLUTION: This motor-driven type damper device is comprised of a motor, a buffle 4 for opening or closing an opening 3 through which fluid passes, and a transmitting means for transmitting a driving operation of the motor to the buffle 4. Then, the buffle 4 is provided with a magnetic member 9 for the buffle and further there are provided some attracting magnetic members 8, 22 attracting the magnetic member 9 for the buffle at at least one of either a closed position or an opened position of the buffle 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper device that uses a motor as a drive source and operates a baffle with respect to an opening, and more particularly to a damper device suitable for controlling intake of cold air in a refrigerator.

[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 portion 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). A leaf spring (not shown) that constantly presses the baffle 72 in the closing direction is arranged behind the baffle 72.

A motor type damper device 7 having such a structure
As the motor of 0, a small synchronous motor or a stepping motor is adopted. In the case of a small synchronous motor, a baffle 72 is opened and closed by rotating it in a fixed direction by using a cam or the like. On the other hand, when using a stepping motor, the baffle 72 is opened and closed by rotating the motor in both directions.

[0004]

Since the conventional motor type damper device 70 shown in FIGS. 20 and 21 uses a leaf spring to urge the baffle 72 in the closing direction, the baffle 72 is in the open position. When it becomes, the strongest force is added. On the other hand, when the baffle 72 is in the open position, the baffle 72 does not become a resistance against the fluid, so that the force for holding the baffle 72 in the open position is sufficient. However, as described above, since the biasing force of the leaf spring is applied, a strong force is required to maintain the position of the baffle 72 at the open position. For this reason, the motor or the like becomes large and the electric capacity increases. As a result, there are disadvantages in terms of cost and space.

It is an object of the present invention to provide a motor type damper device capable of holding the position of a baffle with a small force.

[0006]

In order to achieve such a problem, according to the invention of claim 1, a motor, a baffle for opening and closing an opening through which a fluid flows, and a transmission means for transmitting the drive of the motor to the baffle. In the motor type damper device having the above, the baffle is provided with the baffle magnetic body, and the attraction magnetic body that attracts the baffle magnetic body is provided at at least one of the closed position and the open position of the baffle.

In addition, in the invention described in claim 2, in the motor type damper device according to claim 1, magnetic detection means for detecting opening and closing of the baffle is arranged at at least one of a closed position and an open position of the baffle. doing.

In this motor type damper device, the rotational force of the motor is transmitted to the baffle via a fan-shaped gear or the like, and the baffle operates with respect to the opening. An opening is formed inside the tubular frame, and the baffle moves between a closed position where it abuts the opening and an open position where it does not abut the opening. Therefore, the fluid flowing along the frame or the like, for example, the cool air in the refrigerator flows along the frame or the like. Further, since the baffle is provided with the baffle magnetic body and at least one of the closed position and the open position, the baffle magnetic body is provided with the attraction magnetic body that attracts the baffle magnetic body. Other position holding forces may be unnecessary or greatly reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a motor type damper device of the present invention will be described with reference to FIGS. The motor-type damper device is used in a refrigerator.

In this motor type damper device, a stepping motor 1 serving as a drive source, a cylindrical frame 2 having both ends open, and an opening 3 formed obliquely with respect to the frame 2.
And a baffle 4 that opens and closes the opening 3.

The stepping motor 1 has an output shaft 5 made of SUS, and a pinion 6 made of polyacetal (hereinafter referred to as POM) is fitted to the output shaft 5. The shaft end 6a of the pinion 6 on the side opposite to the stepping motor 1 is supported in a bearing shape by a concave portion 2b of the side 2a of the frame 2. The pinion 6 meshes with the fan-shaped gear 7 made of POM, reduces the rotation of the stepping motor 1 and transmits it to the fan-shaped gear 7. A shaft 13 made of SUS is fitted in the through hole 7b of the rotation center portion 7a of the fan gear 7 to transmit the rotation of the fan gear 7 to the shaft portions 4a and 4b of the baffle 4. A cover 11 made of ABS resin is fitted to the frame body 2 so as to cover these moving mechanisms for moving the baffle 4, and is attached to the frame body 2 by screws 12 and 12. Baffle 4
The shaft portions 4a and 4b and the shaft 13 form a support portion of the baffle 4.

The frame body 2 is made of ABS resin, and in this embodiment, it has a quadrangular prism shape and is provided with a hook 2c for attachment at one end thereof. And
An opening 3 is formed inside the frame body 2, and the baffle 4 and the baffle shaft portions 4 a and 4 b are housed in the frame body 2. At a position facing the baffle 4 at the open position of the frame body 2, a magnetic IC 8 for attraction and a Hall IC 10 for detecting the approach of a magnet 9 as a magnetic body for baffle which will be described later are provided. The Hall IC 10 is fixed to the printed board 20 fixed to the frame body 2. In addition, the frame body 2 is provided with contact portions 21 and 21 that prevent the movement of the sector gear 7.
Are provided so as to face both ends of the sector gear 7.

On the other hand, the opening 3 is formed by surrounding an opening 3b with an opening forming portion 3a that obliquely projects from the frame body 2. The opening 3 of the opening forming portion 3a
The portion facing b is a contact portion 3c protruding toward the baffle 4 and forms a contact surface. Further, the opening forming portion 3a on the shaft 13 side is provided with the shaft portions 4a, 4 of the shaft 13 and the baffle 4.
Since it largely protrudes obliquely so as to cover b, if this motor-type damper device is attached in the state of FIG. 1, frost and thawed water will collect in the root portion 3d of the opening forming portion 3a. In order to prevent this problem, a drainage hole 2d is formed on the side surface of the frame body 2, and the root portion 3d is formed as an inclined surface which descends as it approaches the drainage hole as shown in FIG. A bridging portion 3e is formed so as to cross the center of the opening 3b, and an attracting magnetic body 22 that attracts the magnet 9 serving as the baffle magnetic body is provided in the center thereof.

The baffle 4 is made of polycarbonate, and a soft tape 14 made of foamed polyethylene is fixed to the opening 3 side of the baffle 4. Further, the baffle 4 is rotatable about shaft portions 4a and 4b through which the shaft 13 penetrates, and moves between an open position indicated by a chain line in FIG. 1 and a closed position indicated by a solid line. A magnet 9 which is an isotropic ferrite magnet and constitutes a baffle magnetic body is provided at a substantially central position of the baffle 4. Here, the shaft 13 has a bearing 16 with a locking portion.
Are fitted to support the shaft 13. In addition, one end of the shaft 13 penetrates the shaft portion 4 b of the baffle 4, is supported by the frame body 2, and the other end is supported by the cover 11.

As shown in FIG. 5, the shaft portion 4a of the baffle 4 is provided with a shaft insertion cutout hole 4c, a through hole 4d, and a groove 4f into which the central pin 17 of the shaft 13 is inserted. There is. Further, the shaft portion 4b is provided with a through hole 4e and a groove 4g into which the pin 18 on one end side of the shaft 13 is inserted.

As shown in FIG. 6, the shaft 13 has a through hole 13a for holding the central pin 17 therethrough, a through hole 13b for holding the pin 18 on one end side, and a pin on the other end side. A through hole 13c for penetrating and holding 19 and a flat small diameter portion 13d for inserting into the shaft insertion cutout hole 4c of the baffle 4 are provided.

The baffle 4 and the shaft 13 configured as described above
The engagement with is performed by pins 17, 18 and 19. This engagement is carried out by first holding the baffle 4 in the frame pair 2 at a position substantially corresponding to the installation position thereof, and inserting the shaft formed in one of the shaft portions 4a, 4b of the baffle 4 shown in FIG. The flat small-diameter portion 13d of the shaft 13 in which the pins 17, 18, and 19 are previously inserted and fixed in the cutout hole 4c is shown in FIG.
Insert in the direction of arrow B in (A). In addition to the pins 17, 18, and 19, the fan gear 7 and the bearing 16 with a locking portion are fixed to the shaft 13 in advance.

Thereafter, the shaft 13 is further inserted, and the shaft portion 4
It is incorporated in the through hole 4d of a. Then, the shaft 13 is shown in FIG.
(A) and FIG. 7 (A), it moves to the left and puts one end of the shaft 13 into the through hole 4e of the shaft portion 4b. In this way,
The baffle 4 and the shaft 13 are integrally assembled to the frame body 2. At this time, the end of the shaft 13 is held by the frame body 2, and the bearing 16 with the locking portion is also held by the frame body 2. The bearing 16 with the locking portion has a locking portion 16a having elasticity, and its tip is a hook portion. For this reason, after fitting into the bearing through hole provided in the frame body 2, it is prevented from coming off by the action of the hook portion.

The pins 17, 18 and 19 are provided on the shaft portion 4a.
The groove 4f, the groove 4g of the shaft portion 4b, and the groove 7c formed in the rotation center portion 7a of the fan gear 7 are located at a total of three places. The engagement between the pins 17 and 18 and the shaft portions 4a and 4b of the baffle 4 and the engagement between the pin 19 and the groove 7c are performed with a slight clearance g for play. The shaft 13 and the shaft portions 4a and 4b of the baffle 4 are engaged with each other with a slight play gap h so that the baffle 4 can be tilted with respect to the opening 3. That is, the direction perpendicular to the surface of the opening 3, which is the same as the insertion direction of the pin 16, has a slight gap h in the vertical direction between the shaft 13 and the shaft portions 4a and 4b of the baffle 4. It is provided.

The motor type damper device constructed as described above is incorporated in a refrigerator in a form as shown in FIG. 11, for example.

The refrigerator 30 is a mid-freezer type refrigerator having a freezing compartment 23 in the center, a refrigerating compartment 24 in the upper part, and a vegetable compartment 25 in the lower part. And a duct 26 for blowing cool air to the refrigerator compartment 24.
The motor-type damper device is fitted into a portion of the duct 26 that communicates with the refrigerator compartment 24. That is, the frame 2 of the motor type damper device is fitted so as to form a part of the duct 26, and the damper device itself also serves as the duct 26. The motor-type damper device may be attached to the vegetable compartment 25 instead of the refrigerator compartment 24, or may be attached to both compartments as shown in FIG. In the refrigerator 30, the cool air generated in the evaporator 27 is sent to the refrigerating room 24 and the vegetable room 25 by the fan motor 28 via the cold airflow passage 29. Then, the introduction of the cold air into the refrigerator compartment 24 and the vegetable compartment 25 is controlled by these damper devices.

Next, the operation of this motor type damper device will be described.

A CPU or the like for controlling the temperature inside the refrigerator 30 issues a command to the motor type damper device to introduce cold air. Then, the stepping motor 1 is driven, and its rotation is performed by the pinion 6, the sector gear 7, the shaft 13, the shaft portion 4a,
The signal is transmitted to the baffle 4 via the line 4b. As a result, the baffle 4 is separated from the opening 3 against the attraction force between the magnet 9 and the attraction magnetic body 22, and is moved to the open position (see the alternate long and short dash line in FIG. 1) which is a position parallel to the frame body 2. Moving.

The stepping motor 1 is driven at a constant pulse rate, as shown in FIGS. 8 and 9.
There is a method of changing the pulse rate as shown in.
In the method shown in FIGS. 8 and 9, first, the stepping motor 1 is driven at a low pulse rate (R1 in FIG. 8). At this low pulse rate R1, the torque becomes large. When the baffle 4 freezes, this driving is performed for the time t1 required to separate the baffle 4 from the freeze. Further, the magnet 9 is separated from the attracting magnetic body 22 by driving with the low pulse rate R1, that is, with high torque. Note that this time t1 is as shown in FIG.
As shown in, set by setting a timer.

After that, a high pulse rate (R2 in FIG. 8)
Drive the baffle 4 to immediately before the open position. This high pulse rate R2 can be set to an appropriate value that satisfies a predetermined opening / closing time. In addition, this high pulse rate R
The time t2 for driving at 2 is also set by starting a timer as shown in FIG.

When the baffle 4 comes just before the open position, it is driven again at a low pulse rate (R3 in FIG. 8). Then, the magnet 9 of the baffle 4 is attracted to the attracting magnetic body 8 of the frame body 2, the attracting magnetic body 8 and the magnet 9 contact each other, and the baffle 4 is in the open position. The time t3 of the low pulse rate R3 is set to a time that covers variations in the operating time of the baffle 4, that is, the difference between the maximum and the minimum of the operating time. Therefore, normally, the pulse is continuously supplied to the stepping motor 1 even after the magnet 9 hits the attracting magnetic body 8 and enters the attracting state. However, since the baffle 4 cannot rotate, the stepping motor 1 is out of step and the baffle 4 is locked. At this time, the pin 17 is attached to the shaft portion 4a and the pin 18
Causes noise to strike the shaft portion 4b and the pin 19 to the groove 7c at the low pulse rate R3. However, since the pulse rate is low, noise also becomes small as shown in FIG. That is, the noise in the step-out state is smaller as the pulse rate is lower. Therefore, the baffle 4 is conventionally driven at 100 pps to 300 pps, whereas in this embodiment, 25 pps or 50 pps is adopted as the low pulse rate, so that noise is reduced.

In this way, the baffle 4 is attached to the magnetic material 8 for adsorption.
To cause the stepping motor 1 to step out, the original position of the baffle 4 is reset on the circuit. By doing so, the origin of the baffle 4 can be reliably defined. The origin may be defined on the closed position side instead of the open position side, or may be set on both sides.

Although the low pulse rate R1 and the low pulse rate R3 are the same in this example, they may be different. Further, the transition from the low pulse rate to the high pulse rate and vice versa may be gradually performed.

On the other hand, when the baffle 4 comes to the open position, the magnet 9 fixed to the baffle 4 comes close to the Hall IC 10. Therefore, the Hall IC 10 generates a signal to notify the CPU and the like in the refrigerator 30 that the baffle 4 has reached the open position. In this state, the attracting magnetic body 8
The open position is maintained by the attraction force of the magnet 9 or by the attraction force of the stepping motor 1 or the relaxation torque in addition to the attraction force. The Hall IC 10 is for monitoring the operation of the baffle 4 as described above, and notifies the CPU and the like that the baffle 4 is on the open position side.

A room to which cold air is sent, for example, a cold room 24
When the baffle 4 cools down and a signal instructing to close the baffle 4 is generated, the stepping motor 1 is rotated in the direction opposite to that in the previous driving in the opening direction, and the baffle 4 starts to be driven in the closing direction. The pulse rate and the time for driving the stepping motor 1 at this time are the same as those in the driving in the opening direction. That is, the low palace rate R
It drives at time t1 at 1, then at next higher pulse rate R2 for time t2, and finally at lower pulse rate R3 for time t3. Then, the moving position from the origin is detected based on the number of pulses. When the number of pulses reaches a predetermined number, the closing position of the baffle 4 is determined, and the driving of the stepping motor 1 is stopped.

Stopping the driving of the stepping motor 1
Even after the soft tape 14 fixed to the baffle 4 contacts the contact portion 3C of the opening 3, the pins 17, 18, 19
Stops after moving within the range of the play gap g. Therefore, the attraction force of the magnet 9 acts on the baffle 4,
The soft tape 14 having elastic force is pressed, and the contact portion 3
The c bites into the soft tape 14 and firmly abuts without a gap. At the time of this contact, if there is variation in the amount of protrusion of the contact portion 3c of the opening 3 or the shape of the baffle 4,
Even if there is a gap g, there is a possibility that the contact will not be completed completely, but in this motor type damper, there is a gap h that allows the contact surface to tilt freely, so there is such variation. However, they can be brought into complete contact with each other. Further, normally, the stepping motor 1 comes into contact with the opening 3 of the baffle 4 in a step-out manner in the same manner as in the opening direction. Further, the low pulse rates R1 and R3 may be made different as in the case of the driving in the opening direction, or the low pulse rate and the high pulse rate may be gradually changed.

Here, the moving time from the open position of the baffle 4 (the position indicated by the chain line in FIG. 1) to the closed position (the position indicated by the solid line in FIG. 1) is controlled by the pulse generation rate. In this example, the initial time t1 is driven at 25 pps or 50 pps for about 1 second, and the subsequent time t2 is 100 pps, 200 pp.
It is driven at s or 300 pps. And 10
Approximately 25 seconds for 0 pps and approximately 1 for 200 pps
In the case of 2 seconds and 300 pps, it is about 8 seconds. The last time t3 is 25 pps or 50 pps, and the drive is continued for about 1 second. This driving method is the same in the case of the opening direction described above.

When it is desired to stop the baffle 4 between the open position and the closed position instead of the completely open position, the baffle 4 is once moved to the open position to return to the origin, and then the pulse from the origin is applied. This is done by stopping the stepping motor 1 in a smaller number of stages than in the closed position. The movement angle α from the open position (the position indicated by the one-dot chain line in FIG. 1) to the closed position (the position indicated by the solid line in FIG. 1) is 4 in this embodiment.
Although it is set to 5 degrees, other angles can be appropriately adopted.

In the embodiment shown in FIGS. 1 to 11, since the opening 3 is formed obliquely with respect to the frame body 2, the movement angle of the baffle 4 becomes small and the baffle 4 can be opened and closed quickly. be able to. In addition, since the protrusion of the opening forming portion 3a can be inclined, the degree of blocking the fluid is smaller than the amount of protrusion. In addition, since the open position of the baffle 4 is set to be substantially parallel to the frame body 2, cold air flowing along the frame body 2 in the open state is blocked by the baffle 4 and the opening 3. Almost nothing is done, and it flows straight. Therefore, there is no loss of cold air transmission,
A refrigerator with good efficiency of cold air transmission and diffusion.

Next, a second embodiment of the motor type damper device of the present invention will be described with reference to FIGS. This device is also incorporated in the refrigerator as in the first embodiment.

This motor type damper device has an AC synchronous motor 31 as a drive source, a cylindrical frame body 32 with both ends open, and an opening 33 formed in one of the frame bodies 32.
And a baffle 34 that opens and closes with respect to the opening 33.
It is mainly composed of

The AC synchronous motor 31 has an output shaft 35 made of SUS, and a pinion 36 made of POM is fitted to the output shaft 35. The pinion 36 meshes with the first gear 37, the first gear 37 meshes with the second gear 38, the second gear 38 meshes with the idler gear 39,
The idler gear 39 meshes with the gear portion 41 of the cam gear 40. In this way, the rotation of the AC synchronous motor 31 is transmitted to the cam gear 40.

The cam gear 40 is provided with a cam groove 42. The cam form by the cam groove 42 is as shown in FIG. Further, in the cam groove 42,
The cam follower portion 44 of the spindle 43 is engaged. The baffle 34 is locked to one end of the spindle 43 via a mounting shaft 45.

The frame 32 is made of ABS resin and, in this embodiment, has a quadrangular prism shape and is integrally formed with a device main body frame 46 for accommodating drive mechanism parts such as the AC synchronous motor 31 and the cam gear 40. Has been done. And the frame 3
The opening 33 is formed at one end of the baffle 2, and the attraction magnetic body 48 and the Hall IC 49 are provided on the back surface of the baffle 34 at a position facing a magnet 47 described later.

On the other hand, the opening 33 is formed by surrounding an opening 33b with an opening forming portion 33a that obliquely projects from the frame 32. Then, the opening forming portion 33
The portion of the a that faces the opening 33b becomes the contact portion 33c that projects toward the baffle 34, and forms the contact surface.
Although the opening 33 is formed integrally with the frame 32, it may be a separate member.

The baffle 34 is made of polycarbonate, and the soft tape 50 made of foamed polyethylene is fixed to the opening 33 side of the baffle 34. The baffle 34 is provided with shafts 51, 51, which are inserted into shaft parts 52, 52 formed in the apparatus body frame 46, and are rotatable about the shafts 51, 51 as fulcrums. Then, it moves between the closed position indicated by the alternate long and short dash line in FIG. 13 and the open position indicated by the solid line. A magnet 47 is provided at a substantially central position of the baffle 34 and abuts on the magnetic attraction member 48 when the magnet 47 is in the closed position.

A holding plate 53 made of a magnetic material is provided on the back surface of the baffle 34 to regulate the position of the baffle 34 when the baffle 34 is open and to attract the magnet 47. The holding plate 53 is fixed to the device body frame 46 with screws 54.

Next, the operation of the motor type damper device according to the second embodiment will be described.

A CPU or the like for controlling the temperature in the refrigerator issues an instruction to introduce cold air to the motor type damper device. Then, the AC synchronous motor 31 is driven, and its rotation is transmitted to the cam gear 40 via the pinion 36, the first gear 37, the second gear 38, and the idler gear 39. Then
The rotation causes the spindle 43 to linearly move by the cam groove 42, and drives the baffle 34. As a result, the baffle 34 moves away from the opening 33 against the attraction force of the magnet 47 and the attraction magnetic body 48, and the open position (see the solid line in FIG. 1).
Go to

The AC synchronous motor 31 is driven at a constant rotation, but as shown in FIG. 15, the initial inclination of the cam groove 42 is a cam shape having a smooth angle θ1, so that driving is started. At this time, the magnet 47 is gradually separated from the attracting magnetic body 48 with a large torque. That is, a sufficient torque can be generated in order to counter the attractive force. After that, the angle θ2 becomes steeper, and the baffle 34 rapidly moves to the open position side. When the spindle 43 reaches the position where the angle θ2 is reached, the Hall IC 49 detects the separation of the magnet 47 and outputs a signal 55 indicating that the baffle 34 is at the open position side to a control circuit such as a CPU. Will be sent to.

When the baffle 34 comes to the open position side, the magnet 47 is attracted to the holding plate 53, and the baffle 34 stops moving. On the other hand, the AC synchronous motor 31 stops after a predetermined time elapses. At this time, the cam follower unit 44 is
It comes to the position of M shown in FIG. 15 and stops. Then, the attraction force acts between the magnet 47 and the holding plate 53, and the baffle 34 holds the open position.
The energized holding force or reluctance torque may be applied to hold the open position.

When the room to which the cool air is sent, for example, the refrigerating room is cooled and a signal is generated to instruct the baffle 34 to be closed, the AC synchronous motor 31 starts to rotate in the same direction as before, and the baffle 34 is removed. , Begins to be driven in the closing direction. Even at this time, the cam groove 4 having a gentle angle at the beginning of driving
2, the baffle 34 moves gradually. That is, the torque is increased in order to counter the attractive force between the magnet 47 and the holding plate 53. After that, the cam groove 42 becomes a steep angle, and the baffle 34 is closed at a high speed.
Then, after a lapse of a predetermined time, it is determined that the baffle 34 is at the closed position, and the AC synchronous motor 31 stops driving. In addition,
At this closed position, the Hall IC 49 detects the approach of the magnet 47 and sends a signal 56 indicating that the baffle 34 is on the closed position side to a control circuit such as a CPU. As described above, the Hall IC 49 has a function of monitoring the operation of the baffle 34.

The driving of the AC synchronous motor 31 is stopped by the cam follower portion 44 having a horizontal cam groove 42 even after the soft tape 50 fixed to the baffle 34 comes into contact with the contact portion 33c of the opening 33. Move the part a little and then stop. Then, the soft tape 50 having an elastic force is applied to the contact portion 33 between the magnet 47 and the magnetic attraction member 48.
Since the contact portion 33c is set at a position where it bites into c, the abutting portion 33c tightly abuts the soft tape 50 without a gap. At the time of this contact, the contact portion 3 of the opening 33 is
If there is variation in the amount of protrusion of 3c or the shape of the baffle 34, there is a possibility that the contact will not be completed even with such settings, but in this motor type damper, the contact surface is The shafts 51, 51 and the shaft portion 52, so that they can be tilted
Since gaps (not shown) are provided between the mounting shaft 45 and the baffle 34 and between the mounting shaft 45 and the mounting shaft 45, even if there are such variations, they can be brought into complete contact with each other.

The above-described embodiments are examples of preferred embodiments of the present invention, but the present invention is not limited to these, and various modifications can be made without departing from the gist of the present invention. Is. For example, in the first embodiment, the frame body 2 may be used as the frame body by directly using the duct in the refrigerator 30. Further, the moving mechanism may be provided inside the duct wall of the refrigerator 30. That is, the cover 11 may be used together with the duct wall of the refrigerator 30. Also, the origin of the baffle 4 is not in the open position,
It may be in the closed position. Further, as the motor, in addition to the stepping motor 1, other motors such as an AC synchronous motor and a DC motor can be used. Further, instead of the sector gear 7, a normal gear may be used. Further, the opening 3 may not be inclined with respect to the frame 2 but may be in a direction perpendicular to the frame 2. In addition, the opening position of the baffle 4 may be not obliquely parallel to the frame 2 but may be oblique.

Further, in the first embodiment, the magnet 9 may be a magnetic body other than the magnet, the attraction magnetic bodies 8 and 22 may be magnets, or all the magnetic bodies may be magnets. This relationship is the same in the second embodiment. Further, a reed switch may be used instead of the Hall ICs 10 and 49. These Hall ICs
You may use 10,49 and a reed switch for control of the drive time of the motors 1,31.

Further, as a modification of the first embodiment,
A magnet 60 as shown in FIG. 16 and FIG. 17 is attached to the entire circumference or several places of the baffle 4, while a magnetic body 61 such as iron is attached to the entire circumference or several places of the opening forming portion 3a, and the magnetic body is attached to the frame body 2. You may make it attach 62. In this case, the magnet 60 may be replaced by a magnetic material, and the magnetic materials 61 and 62 may be magnets, or both may be magnets. As described above, when the baffle 4 is brought into contact with the opening 3 using the magnet,
Only a large driving force by the stepping motor 1 or the like is required when separating the baffle 4 from the opening 3, and no load is applied to the baffle 4 at other positions. Therefore, a holding force such as a day tent torque is almost unnecessary. As a result, the drive source such as the motor can be downsized. If a magnet is adopted as the magnet 60, it is preferable when it is attached to the entire circumference of the baffle 4.

When a magnet is used, FIG.
Also, a structure as shown in FIG. 19 may be used. That is, the magnet 63 is attached to the center of the baffle 4 by the spring 64 so as to be slightly movable in the vertical direction with respect to the opening 3. On the other hand, a bridging portion 3e extending from the opening forming portion 3a is formed at the center of the opening 3, and a magnetic material 65 such as iron is arranged at the center thereof. In this example as well, a combination of a magnet and a magnetic body similar to those in FIGS. 16 and 17 may be used. In the case of this example, in addition to the effect that the drive source such as the motor can be downsized as in FIGS. 16 and 17, various errors can be absorbed by the spring 64, which facilitates the manufacturing work and the assembling work.

In each of the above-mentioned embodiments, the case where the motor type damper device of the present invention is used for controlling the cool air of the refrigerator is shown, but the present invention is also applicable to other devices such as air conditioners and water supply devices that handle fluids. The invention can be applied.

Further, the position is held at both the open position and the closed position by utilizing the attractive force of a magnet or the like.
Position holding using the attraction force may be provided on at least one side and another holding mechanism such as a motor reluctance torque may be used on the other side. Even in that case, on one side, the position can be held with a small force. In addition, in the case of one side, it is preferable that the closed position side has a structure utilizing the suction force. This is because the open position does not receive the resistance of the fluid, and the reluctance torque of the motor or the like is sufficient.

As explained above, in the motor type damper device according to the first aspect, since the baffle position is held by utilizing the attraction force of the magnet, a large force other than the attraction force is not required. Baffle position can be maintained.
As a result, for example, the position holding means that also serves as a drive source such as a motor can be downsized, and the entire device can be downsized. Further, since it is possible to energize the motor or the like and maintain the position with no need or low power, the required power and current capacity of the device can be reduced, and an energy saving device can be obtained.

According to the second aspect of the present invention, since the opening and closing of the baffle can be monitored by the magnetic detection means, there is no danger that the device will run out because the operating position is unknown.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of a motor type damper device of the present invention, (A) is a sectional view thereof, and (B) is an enlarged view of a periphery of a shaft portion thereof.

FIG. 2 is a partially cutaway front view in which the front frame portion and the opening forming portion are omitted, as viewed from the direction of arrow II in FIG. 1;

FIG. 3 is a view as viewed from the direction of arrow III in FIG. 2, with a cover removed and a stepping motor virtually added.

FIG. 4 is a view of the baffle viewed from a direction indicated by an arrow IV in FIG. 1 when the baffle is in an open position.

FIG. 5 is a diagram showing a baffle used in the first embodiment shown in FIGS. 1 to 4, (A) is a rear view, and (B) is a front view seen from an arrow B of (A). 7C is a side view seen from the arrow C of FIG.

FIG. 6 is a view showing a shaft used in the first embodiment shown in FIGS. 1 to 4, (A) is a front view, and (B) is a plan view.

FIG. 7 is a view for explaining a method of assembling the baffle and the shaft used in the first embodiment shown in FIGS. 1 to 4;
(A) is a plan view, (B) is a view seen from the arrow B direction of (A).

FIG. 8 is a diagram showing fluctuations in the pulse rate for driving the stepping motor used in the first embodiment shown in FIGS. 1 to 4.

9 is a flowchart for driving a stepping motor used in the first embodiment shown in FIGS. 1 to 4. FIG.

FIG. 10 is a graph showing noise during step-out of the stepping motor in the first embodiment shown in FIGS. 1 to 4, (A) showing background noise, and (B) shown in parentheses. The noise when the stepping motor is driven with the voltage and the pulse rate is shown. The numerical value in each graph shows the maximum value of each noise.

FIG. 11 is a cross-sectional view showing an example of a refrigerator to which the motor type damper device of the present invention is applied.

FIG. 12 is a plan view of a second embodiment of the motor type damper device of the present invention.

FIG. 13 is a sectional view of FIG.

FIG. 14 is a sectional view taken along the line ABCDE of FIG. 12;

FIG. 15 is a diagram showing signals from a cam form of a cam gear used in FIG. 12 and a Hall IC.

FIG. 16 is a side view with a cross section of a frame and an opening for explaining a modified example of the magnetic material for baffle and the magnetic material for adsorption according to the first embodiment of the motor type damper device of the present invention.

FIG. 17 is a view as seen from the direction of the arrow XIIV in FIG. 16, and is a partially cutaway front view in which the front frame portion and the opening forming portion are omitted.

FIG. 18 is a side view with a frame and an opening in section for explaining a second modified example of the magnetic material for baffle and the magnetic material for adsorption according to the first embodiment of the motor-type damper device of the present invention. Is.

FIG. 19 is a view as seen from the direction of the arrow XVIV in FIG. 13, and is a front view of a main part with the front frame and the opening forming part omitted.

FIG. 20 is a front view of a conventional damper device.

FIG. 21 is a partially cutaway side view of FIG. 20.

[Explanation of symbols]

 1 Stepping Motor (Motor) 2 Frame 3 Opening 3c Abutment 4 Baffle 6 Pinion (Transmission Means) 7 Fan Gear (Transmission Means) 8 Magnetic Material for Adsorption 9 Magnet (Magnetic Material for Baffles) 10 Hall IC (Magnetic) Detection means) 13 axis (transmission means) 14 soft tape 22 magnetic material for adsorption

Claims (2)

[Claims] 1. A motor type damper device having a motor, a baffle for opening and closing an opening through which a fluid flows, and a transmission means for transmitting the drive of the motor to the baffle, wherein the baffle is provided with a magnetic material for baffle. A motor-type damper device characterized in that an adsorption magnetic body that attracts the baffle magnetic body is provided at at least one of a closed position and an open position of the baffle. 2. A magnetic detection means for detecting opening / closing of the baffle is arranged at at least one of a closed position and an open position of the baffle.
The motor type damper device described.