JP3228317B2 - Motor type damper device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art As shown in FIGS. 16 and 17, a conventional damper device, especially a motor type damper device for a refrigerator, has a baffle 52 and a driving mechanism 53 such as a motor, etc. Are arranged (see Japanese Patent Application Laid-Open No. 6-109354). A leaf spring (not shown) that constantly presses the baffle 52 in the closing direction is disposed behind the baffle 52.

[0003] A motor-type damper device 5 having such a structure.
0 is used in the refrigerator 60 as shown in FIG. That is, the refrigerator 60 is divided into a freezer compartment 61, a refrigerator compartment 62 and a vegetable compartment 63, and an evaporator 64 is provided at the bottom of the freezer compartment 61. Evaporator 6
A fan motor 65 is disposed at the rear of the fan 4 to circulate the obtained cool air to the freezing room 61 and the refrigerating room 62.

[0004] A partition slope 66 is provided between the evaporator 64 and the refrigerating chamber 62 to block the cool air of the evaporator 64 from flowing directly to the refrigerating chamber 62. On the other hand, a cool air passage 67 is formed between the rear part of the partition slope 66 and the rear inner wall of the refrigerator 60, and the damper device 50 is disposed in the cool air passage 67. When the baffle 52 of the damper device 50 is in an open state, the cool air flow passage 67, which is a passage for the cool air, has a crank shape. Further, the damper device 50 is installed so as to be held by a partition wall 68 forming a part of the cool air flow passage 67.

[0005] In recent years, along with the mid-freezer of a refrigerator, a type of refrigerator has been developed in which cold air obtained at a central evaporator is transferred to a refrigerator room located at an upper position and a distant position.

[0006]

The conventional motor type damper device 50 shown in FIGS. 16 and 17 drives the baffle 52 because the motor is disposed not on the side of the baffle 52 but on the root side. The mechanism also has a structure provided at the base of the baffle 52. That is, the baffle 52 is driven by a motor and the baffle 5
2 requires a space at the base of the baffle 52, and the cam is disposed at the base of the baffle 52.
However, a large opening cannot be provided for the size.

A conventional motor type damper device 50
Is a type orthogonal to the cool air flow passage 67, and can be used only for bending the flow of the cool air at a right angle. Moreover, in the refrigerator 60 using such a damper device 50,
Since the cold air passage 67 has a crank shape, the cold air passage 6
7 becomes long, and loss occurs in terms of cold air transmission. This loss is extremely disadvantageous for the refrigerator in the mid-freezer partly due to its long cool air passage. Moreover, since the cold air flow passage 67 has a crank shape,
As shown in FIG. 18, the protrusion width M of the partition wall 68 into the inside of the refrigerator 60 is increased, which contributes to a reduction in the volume of the refrigerator 60.

Further, the opening operation of the baffle 52 does not open to a position parallel to the flow of cold air,
As shown in FIG. 7, since the baffle 52 opens only up to the oblique position, the baffle 52 becomes resistant to the flow of the cool air, which is not preferable for quick diffusion of the cool air.

Further, such a motor type damper device 5
In a damper device used for a refrigerator or the like, including zero, when the baffle 52 is in the closed position, it is required to completely shut off cold air and the like. On the other hand, the baffle 52
When in the closed position, the baffle 52 etc. freezes with other parts,
You need to be careful not to lock it. further,
Pressing with a leaf spring has a strong force and is preferable for complete blocking, but is not preferable for stable operation of the driving mechanism 53 such as a motor because the pressing force varies greatly depending on the position of the baffle 52. .

The present invention has been made in view of the above problems, and has as its object to provide a motor-operated damper device that can make full use of the size of a baffle and can reliably close the baffle. And It is another object of the present invention to provide a motor-type damper measure that makes it difficult to cause icing and that can perform stable and accurate driving.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, a motor, a baffle for opening and closing an opening through which a fluid flows, and a transmission unit for transmitting the drive of the motor to the baffle are provided. A motor-type damper device having a biasing means for bringing the baffle into contact with the opening, wherein the motor is disposed on the side of the baffle and provided on the baffle.
The shaft forming a part of the transmission means is engaged with the engaged portion,
The joint is a gap that is movable in the pressing direction of the urging means.
When the baffle is in the closed position, the baffle forms play in the opening and closing directions, and the baffle is brought into close contact with the opening by the biasing means.

[0012] In the second aspect of the present invention, the motor
A baffle that opens and closes an opening through which fluid flows,
Transmission means for transmitting the drive of the motor to the baffle, and the baffle
Motor type damper having urging means for contacting the opening
-In the device, place the motor on the side of the baffle and
A shaft with which the ruffle engages and forms part of the transmission means
And a gear engaged with the shaft and forming a part of the transmission means.
Is a play that is a gap that is movable in the rotation direction between
When the baffle is in the closed position, the baffle opens and closes
Form rattling and baffle by biasing means
Is in close contact with the opening.

According to a third aspect of the present invention, in the motor type damper device according to the first or second aspect, the shaft forming a part of the transmission means is a resin having a metal shaft inserted therein. It consists of. Further, in the invention according to claim 4 , in the motor type damper device according to claim 1 or 2 , the biasing means is a torsion coil spring. In addition, in the invention described in claim 5 , according to claim 1 or
2. In the motor type damper device described in 2 , the opening is formed inside the cylindrical frame body whose both ends are open.

In this motor type damper device, the rotational force of the motor is transmitted to the baffle via transmission means such as a sector gear, and the opening and closing operation is performed on the opening using a large area of the baffle. For this reason, the fluid flowing through the opening, for example, the cold air in the refrigerator, is blocked by the baffle or flows without being blocked. In addition, when the baffle is in the closed position, a play is provided in the drive transmission path from the motor to the baffle when the baffle rattles in the opening / closing direction. The biasing means firmly presses the baffle against the contact surface.

When the opening is provided inside the cylindrical frame whose both ends are opened, the fluid such as the cool air flows smoothly along the frame. In addition, when the shaft that engages with the baffle is formed of a resin in which a metal shaft is inserted, it is possible to accurately engage with the baffle. For this reason, even if the transmission means is arranged on the side of the baffle, the drive transmission is performed with high accuracy.

In addition, when the biasing means is a torsion coil spring, the change in spring pressure between the open position and the closed position of the baffle can be reduced, and the operation of the motor and the transmission means is stabilized. In addition, since the space between the torsion coil spring and the baffle and the space between the torsion coil spring and its supporting member are always in a sliding state, the risk of freezing is reduced.

[0017]

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

This motor type damper device has a stepping motor 1 as a driving source, a cylindrical frame 2 having both ends opened, 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 a sector gear 7 made of POM, reduces the rotation of the stepping motor 1 and transmits the rotation to the sector gear 7. A magnet 8 made of an isotropic ferrite magnet is fixed to one end of the sector gear 7, and a Hall IC 9 for detecting the approach of the magnet 8 is provided on the printed circuit board 10 on the frame 2.
Is fixed through. A shaft 13 made of SUS is fitted in the through hole 7b of the rotation center portion 7a of the sector gear 7 to transmit the rotation of the sector 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 2 so as to cover these moving mechanisms for moving the baffle 4, and is attached to the frame 2 by screws 12. The shaft portions 4a, 4 of the baffle 4
The b and the shaft 13 constitute a support portion of the baffle 4.
The pinion 6, the sector gear 7 and the shaft 13 constitute transmission means.

The frame 2 is made of ABS resin. In this embodiment, the frame 2 has a quadrangular prism shape, and a hook 2c for attachment is provided at one end. And
An opening 3 is formed inside the frame 2, and a baffle 4 and shaft portions 4 a and 4 b of the baffle are housed in the frame 2.

On the other hand, the opening 3 is formed by an opening forming portion 3a projecting obliquely from the frame 2 surrounding the periphery of the opening 3b. 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. In addition, the opening forming portion 3a on the shaft 13 side includes the shaft portions 4a and 4
When the motor-type damper device is mounted in the state of FIG. 1, frost and thawed water will accumulate at the base 3 d of the opening forming portion 3 a because the protrusion protrudes obliquely so as to cover b. In order to prevent this problem, a drain hole 2d is formed in the side surface of the frame 2, and the base 3d has a slope descending as approaching the drain hole 2d as shown in FIG. The opening 3 is formed integrally with the frame 2, but may be formed as a separate member.

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 around the shaft portions 4a and 4b through which the shaft 13 passes, and moves between an open position indicated by a dashed line in FIG. 1 and a closed position indicated by a solid line. A spring engaging portion 4h is provided substantially at the center of the baffle 4, and one end of a coil spring 15 serving as an urging means is hooked. The other end of the coil spring 15 is hooked on a groove 2 e formed in the frame 2. Further, a bearing 16 with a locking portion is fitted to the shaft 13 to support the shaft 13. Note that one end of the shaft 13 passes through the shaft portion 4b of the baffle 4,
The other end is supported by the cover 11, supported by the frame 2.

As shown in FIG. 4, a shaft portion 4a of the baffle 4 is provided with a shaft insertion notch hole 4c, a through hole 4d, and a groove 4f into which the center pin 17 of the shaft 13 is inserted. I have. The shaft portion 4b is provided with a through hole 4e and a groove 4g into which the pin 18 at one end of the shaft 13 is inserted.

As shown in FIG. 5, the shaft 13 has a through hole 13a for holding the center pin 17 therethrough, a through hole 13b for holding the pin 18 at one end and a pin at the other end. The baffle 4 has a through-hole 13c for holding the through-hole 19 and a flat small-diameter portion 13d for being inserted into the shaft insertion notch hole 4c of the baffle 4.

The baffle 4 and the shaft 13 configured as described above
Is performed by pins 17, 18, and 19. In this engagement, first, the baffle 4 is held on the frame body 2 at a position substantially coincident with its installation position, and the shaft insertion formed on one of the shaft portions 4a and 4b of the baffle 4 shown in FIG. FIG.
Insert in the direction of arrow B in (A). In addition to the pins 17, 18, and 19, the sector 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 4
a into the through hole 4d. Then, the shaft 13 is moved to FIG.
6A, one end of the shaft 13 is inserted into the through hole 4e of the shaft portion 4b. In this way,
The baffle 4 and the shaft 13 are integrated into the frame 2. At this time, the end of the shaft 13 is held by the frame 2, and the bearing 16 with the locking portion is also held by the frame 2. In addition, the bearing 16 with a locking portion has a locking portion 16a having elasticity, and the tip thereof is a hook portion. For this reason, after fitting into the bearing through-hole provided in the frame 2, the hook portion does not come off.

The pins 17, 18, and 19 are connected to the shaft 4a.
, The groove 4f of the shaft portion 4b, and the groove 7c formed in the rotation center portion 7a of the sector gear 7 in total. The engagement between the pins 17, 18 and the shaft portions 4a, 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 engagement between the shaft 13 and the shaft portions 4a and 4b of the baffle 4 is performed with a slight play gap h so that the baffle 4 can be inclined with respect to the opening 3. That is, the direction perpendicular to the surface of the opening 3 is the same as the direction in which the pins 17 and 18 are inserted, but a slight gap h in the vertical direction between the shaft 13 and the shafts 4a and 4b of the baffle 4. It is provided between them.

The motor type damper device configured as described above is incorporated in a refrigerator, for example, in a form as shown in FIG. Here, the same members as those shown in FIG. 18 are denoted by the same reference numerals, and description thereof will be omitted.

The refrigerator 30 is a refrigerator which is a mid-freezer. A freezer compartment 61 is provided at the center, a refrigerator compartment 62 is provided at an upper portion, and a vegetable compartment 63 is provided at a lower portion. Then, the duct 31 that blows cool air to the refrigerator compartment 62
The motor-type damper device is fitted into a portion of the duct 31 that communicates with the refrigerator compartment 62. That is, the frame 2 of the motor-type damper device is fitted so as to form a part of the duct 31, and the damper device itself also serves as the duct 31. This motor-type damper device may be attached to the vegetable compartment 63 instead of the refrigerator compartment 62, or may be attached to both compartments as shown in FIG.

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

A CPU or the like for controlling the temperature in the refrigerator 20 instructs 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 moves away from the opening 3 against the elastic force of the coil spring 15 and moves to an open position (see a dashed line in FIG. 1) which is a position parallel to the frame 2.

When the baffle 4 comes to the open position, the sector gear 7
The magnet 8 fixed to is rotated to a portion close to the Hall IC 9. Therefore, the Hall IC 9 generates a signal for stopping the stepping motor 1, and the stepping motor 1 stops driving. At this time, the elastic force of the coil spring 15 acts on the baffle 4 to move the baffle 4 to the closed position, but the open position is maintained by the current holding force or the reluctance torque of the stepping motor 1. The signal generation of the Hall IC 9 becomes the origin signal, and defines the origin of the movement of the baffle 4.

The room to which the cool air is to be sent, for example, the refrigeration room 62
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. Then, the movement position from the origin is detected by the number of pulses, and when a predetermined number of pulses is reached,
It is determined that the baffle 4 is in the closed position, and the driving of the stepping motor 1 is stopped. The drive of the stepping motor 1 is stopped even after the soft tape 14 fixed to the baffle 4 comes into contact with the contact portion 3c of the opening 3, even if the pins 17, 18,
19 is stopped after moving within the range of the play gap g.
For this reason, the force of the coil spring 15 acts on the baffle 4, and the soft tape 14 having elasticity is pressed, and the contact portion 3 c bites into the soft tape 14 and makes firm contact with the soft tape 14 without any gap. In this case, if the amount of protrusion of the contact portion 3c of the opening 3 and the shape of the baffle 4 vary, there is a possibility that the contact may not be performed completely even if there is a gap g. However, in this motor type damper device, the contact surface has a gap h that can be tilted freely, so that even if there is such a variation, the contact can be made in a perfect form.

Here, the movement time of the baffle 4 from the open position (the position indicated by the dashed 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, 10
25.8 seconds at 0 pps, 12.9 seconds at 200 pps, 3
8.6 seconds at 00 pps. Alternatively, if the baffle 4 is to be stopped between the open and closed positions instead of the fully opened position, the baffle 4 is temporarily moved to the open position, the home position is returned, and the pulse from the home position returns to the closed position. This is performed by stopping the stepping motor 1 in a smaller number of stages than in the case. In addition, the movement angle α from the open position (the dashed line position in FIG. 1) to the closed position (the solid line position in FIG. 1).
Is 45 degrees in this embodiment, but other angles can be employed as appropriate.

In the embodiment shown in FIGS. 1 to 7, since the opening 3 is formed obliquely with respect to the frame 2, the moving angle of the baffle 4 is reduced, and one end of the coil spring 15 is In addition, the other end can be locked to the baffle 4 for operation. For this reason, the coil spring 15 is
The baffle 4 can be securely housed without any gaps, and can be made compact and can exert its power sufficiently. In addition, since the open position of the baffle 4 is set to a position substantially parallel to the frame 2, the cool air flowing along the frame 2 in the open state is blocked by the baffle 4 and the opening 3. It flows almost straight, with almost no chance of being taken. For this reason, the transmission loss of the cold air is eliminated, and the refrigerator has high efficiency of the cold air transmission and the cold air diffusion.

Next, a second embodiment of the motor type damper device of the present invention will be described with reference to FIGS. This motor type damper device is also used for refrigerators.

This motor type damper device has substantially the same configuration as that of the first embodiment. Therefore, in the following description, the same members as those in the first embodiment will be denoted by the same reference numerals. The motor-type damper device includes a stepping motor 1 serving as a driving source, a cylindrical frame 2 having both ends opened, an opening 3 formed obliquely with respect to the frame 2, and an opening 3. And a baffle 4 that opens and closes with respect to.

The stepping motor 1 has an output shaft 5 made of SUS, and a pinion 6 made of 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 a sector gear 7 made of POM, reduces the rotation of the stepping motor 1 and transmits the rotation to the sector gear 7. A magnet 8 made of an isotropic ferrite magnet is fixed to one end of the sector gear 7, and a Hall IC for detecting the approach of the magnet 8 to the frame 2.
9 is fixed via a printed circuit board 10. Also,
A shaft 21 made of POM into which a metal shaft 20 made of stainless steel is inserted is fitted into the through hole 7b of the rotation center portion 7a of the sector gear 7, and the rotation of the sector gear 7 is performed by the shaft portions 4a and 4b of the baffle 4. To tell. A cover 11 made of ABS resin is fitted to the frame 2 so as to cover these moving mechanisms for moving the baffle 4, and is attached to the frame 2 by screws 12.

The shaft portions 4a and 4b of the baffle 4 and the shaft 2
1 constitutes a supporting portion of the baffle 4. In addition, the pinion 6, the sector gear 7, and the shaft 21 constitute transmission means. Further, between the shaft 21 and the through hole 7b, FIG.
As shown in FIG. 0, a play corresponding to the angle θ, that is, play is provided. The frame 2 is provided with a contact portion 2f for preventing the rotation of the sector gear 7.

The frame 2 is made of ABS resin. In this embodiment, the frame 2 has a quadrangular prism shape and is provided with a hook 2c at one end. And
An opening 3 is formed inside the frame 2, and a baffle 4 and shaft portions 4 a and 4 b of the baffle are housed in the frame 2.

On the other hand, the opening 3 is formed by an opening forming portion 3a projecting obliquely from the frame 2 surrounding the periphery of the opening 3b. 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 21 side includes the shaft portions 4a and 4
When the motor-type damper device is mounted in the state shown in FIG. 8, frost and thawed water will accumulate at the base 3d of the opening forming portion 3a. In order to prevent this problem, a drain hole 2d is formed in the side surface of the frame 2, and a root 3d is formed as a slope descending as approaching the drain hole 2d as shown in FIG. The opening 3 is formed integrally with the frame 2, but may be formed as a separate member.

The baffle 4 is made of polycarbonate, and on the opening 3 side of the baffle 4, a soft tape 14 made of foamed polyethylene is fixed. In addition, the baffle 4 is rotatable around the shaft portions 4a and 4b through which the shaft 21 passes, and moves between an open position indicated by a dashed line in FIG. 8 and a closed position indicated by a solid line. A spring locking portion 4j is provided substantially at the center of the baffle 4, and one end of a coil spring 15 serving as an urging means is fixed with a screw 4k fitted to the spring locking portion 4j. Also, this coil spring 1
The other end of 5 is hooked on a groove 2 e formed in the frame 2. Further, the shaft 21 is fitted into and supported by the bearing 2g. Note that one end of the shaft 21 penetrates the shaft portion 4 b of the baffle 4, is supported by the frame 2, and the other end penetrates the cover 11.

As shown in FIG. 11, the shaft portion 4a of the baffle 4 is provided with a through hole 4m having an oval cross section and a chamfered portion 4n around the through hole 4m. The shaft portion 4b has a through hole 4p having an oval cross section and a chamfered portion 4q around one end thereof.
Are provided.

As shown in FIG. 12, a metal shaft 20 made of stainless steel is inserted into the shaft 21, and both ends thereof are exposed. The cylindrical portion 21a fitted to the bearing portion 2g, the flat small-diameter portion 21b, and the flat small-diameter portion 21c that penetrates the shaft portion 4a and whose leading end engages with the shaft portion 4b.
Are provided. In addition, a metal other than stainless steel can be adopted as the metal shaft 20, but stainless steel is preferable in terms of rust and accuracy.

The baffle 4 and the shaft 21 thus configured
Is performed by the flat small diameter portion 21c. In this engagement, first, the baffle 4 is held in the frame body 2 at a position substantially coincident with the installation position, and the through hole formed in one of the shaft portions 4a and 4b of the baffle 4 shown in FIG. 4
The flat small diameter portion 21c of the shaft 21 is inserted into m in the direction indicated by the arrow D in FIG. Thereafter, the shaft 21 is further inserted and incorporated into the through hole 4p of the shaft portion 4b. Then, the cover 11 is fitted and fixed when the cylindrical portion 21a hits the shaft portion 4a.

The shaft 21 and the shaft portions 4a, 4b of the baffle 4
As shown in FIG. 8B, the engagement with b is performed with a slight play gap h so that the baffle 4 can be inclined with respect to the opening 3. That is, a slight gap h is provided between the shaft 21 and the shaft portions 4 a and 4 b of the baffle 4 in a direction perpendicular to the surface of the opening 3.

The motorized damper device configured as described above is incorporated in a refrigerator, for example, as shown in FIG. 7, similarly to the motorized damper device of the first embodiment. Note that the description of FIG.

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 30 instructs 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 21, the shaft portion 4a,
The signal is transmitted to the baffle 4 via the line 4b. As a result, the baffle 4 moves away from the opening 3 against the elastic force of the coil spring 15 and moves to an open position (see a dashed line in FIG. 8) which is a position parallel to the frame 2.

When the baffle 4 comes to the open position, the sector gear 7
The magnet 8 fixed to is rotated to a portion close to the Hall IC 9. Therefore, the Hall IC 9 generates a signal for stopping the stepping motor 1, and the stepping motor 1 stops driving. At this time, the elastic force of the coil spring 15 acts on the baffle 4 to move the baffle 4 to the closed position, but the open position is maintained by the current holding force or the reluctance torque of the stepping motor 1. The signal generation of the Hall IC 9 becomes the origin signal, and defines the origin of the movement of the baffle 4. Further, even if the hall IC 9 does not operate, the sector gear 7 is stopped by hitting the stop portion 2f. At this time, the stepping motor 1 loses synchronism and enters a locked state, but stops at a predetermined pulse exceeding a pulse necessary for the opening / closing operation, and keeps the locked state.

A room to which cold air is to be sent, for example, a refrigerator 62
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. Then, the movement position from the origin is detected by the number of pulses, and when a predetermined number of pulses is reached,
It is determined that the baffle 4 is in the closed position, and the driving of the stepping motor 1 is stopped. The drive of the stepping motor 1 is stopped after the shaft 21 moves within the range of the play angle θ even after the soft tape 14 fixed to the baffle 4 contacts the contact portion 3c of the opening 3. Stop. For this reason, the force of the coil spring 15 acts on the baffle 4, and the soft tape 14 having elasticity is pressed, and the contact portion 3 c bites into the soft tape 14 and makes firm contact with the soft tape 14 without any gap. At this time, if the amount of protrusion of the abutting portion 3c of the opening 3 or the shape of the baffle 4 varies, there is a possibility that the abutment may not be performed completely even at an angle θ. However, in this motor type damper device, the contact surface has a gap h that can be tilted freely, so that even if there is such a variation, the contact can be made in a perfect form.

Here, the moving time of the baffle 4 from the open position (the position indicated by the dashed line in FIG. 8) to the closed position (the position indicated by the solid line in FIG. 8) is controlled by the pulse generation rate. In this example, as in the previous example, the time is 25.8 seconds at 100 pps, 12.9 seconds at 200 pps, and 8.6 seconds at 300 pps. Alternatively, the baffle 4 may not be in the fully open position, but between the open and closed positions.
Is required to move the baffle 4 to the open position, return to the home position, and then stop the stepping motor 1 in a smaller number of steps than when the pulse from the home position is in the closed position. Do. In this embodiment, the movement angle α from the open position (the position indicated by the one-dot chain line in FIG. 8) to the closed position (the position indicated by the solid line in FIG. 8) is 45 degrees, but other angles may be appropriately employed. .

In the embodiment shown in FIGS. 8 to 12, since the opening 3 is formed obliquely with respect to the frame 2, the moving angle of the baffle 4 is reduced, and one end of the coil spring 15 is In addition, the other end can be locked to the baffle 4 for operation. For this reason, the coil spring 15 can be housed in the frame body 2, the size can be reduced, and the force can be sufficiently exerted, and the closed state of the baffle 4 can be reliably performed without a gap. In addition, since the open position of the baffle 4 is set to a position substantially parallel to the frame 2, the cool air flowing along the frame 2 in the open state is blocked by the baffle 4 and the opening 3. It flows almost straight, with almost no chance of being taken. As a result, there is no transmission loss of cold air,
It becomes a refrigerator with high efficiency of cold air transmission and cold air diffusion.

Further, the shaft 21 has an oval cross section, and the play gap h is only provided in a direction perpendicular to the surface of the opening 3.
Is provided, so that there is no backlash in a direction parallel to the surface of the opening 3. For this reason, there is no backlash in this direction, which is strictly limited in size, and a sufficient opening area can be obtained, and accurate operation can be performed. Further, since the shaft 21 is a shaft made of POM in which the metal shaft 20 made of stainless steel is inserted, sufficient strength and accuracy can be obtained and the cost can be reduced. In addition, since the outer periphery is made of resin, ice hardly adheres.

Next, a third embodiment of the motor type damper device of the present invention will be described with reference to FIGS. This motor type damper device is also used for refrigerators.

This motor type damper device has substantially the same structure and operation as the second embodiment, and the same members will be denoted by the same reference numerals. The difference is in the structure of the frame 2 and the structure of the spring serving as the urging means.
That is, the hook portion 2c of the frame 2 of this device is very narrow, and the length of the cylindrical frame 2 itself is smaller than that of the baffle 4. Also, a spring hole 3e through which a locking end 22a of the torsion coil spring 22 described later penetrates at the beginning of installation, and a locking end 2 of the torsion coil spring 22
A locking portion 3f for locking the 2a is provided in the opening forming portion 3a. In addition, the locking end 22a of the spring hole 3e is
After being expanded in the direction of the arrow A in FIG. 3A and locked by the locking portion 3f, the hole cover 23 closes the hole. The hole cover 23 also functions as a label for displaying a model name and the like.

The locking end 22a of the torsion coil spring 22 is bent at a right angle so as to be locked by the locking portion 3f, and the other end is bent in a mountain shape to form a contact end 22b. The central portion is a winding portion 22c wound around the shaft 21 several times. Then, the apex of the contact end 22b contacts the back surface of the baffle 4, and presses the baffle 4 toward the opening 3. The torsion coil spring 22 presses the baffle 4 using a repulsive force against rewinding.

In order to prevent the contact end 22b from moving in the horizontal direction, the baffle 4 is provided with spring movement preventing portions 24, 2
4 is provided so as to sandwich the contact end 22b. Also,
In order to prevent the winding portion 22c of the torsion coil spring 22 from hitting the opening forming portion 3a, the opening forming portion 3a facing the winding portion 22c is provided with a projecting portion 25 projecting from the opening 3b.

In the third embodiment, since the torsion coil spring 22 is used, the change in the spring pressure during the opening operation can be reduced as compared with the conventional leaf spring, and the driving mechanism is stabilized. Also, the spring pressure can be easily changed by changing the number of turns. Moreover, the winding portion 22c is
And the contact portion 22b rubs against the baffle 4, so that it is hard to freeze. In addition, the spring hole 3e
The hole cover 2 without any special drain holes
The ice or the like that accumulates at the base 3d can be discharged by peeling off the base 3.

Each of the above embodiments is an example of a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention. It is. For example, the frame 2 may be a frame using the duct 31 in the refrigerator 30 as it is. Further, the moving mechanism may be provided inside the wall of the duct 31 of the refrigerator 30. That is, the cover 11 may be used together with the duct 31 of the refrigerator 30.
Further, the baffle 4 may be driven in the opening direction by a motor, and the closing direction may be driven by a spring force of a coil spring or the like. Further, other than the stepping motor 1, other motors such as an AC synchronous motor and a DC motor can be used as the motor. Further, a normal gear may be used instead of the sector gear 7. 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.

The coil spring 15 is not pressed against the opening 3 by using a pulling force, but is
The baffle 4 may be brought into contact with the opening 3 by using a compression coil spring placed on the back surface of the opening 3. In this way, the response to icing is advantageous.
That is, if the compression coil spring is used, the expansion force of the compression coil spring is initially increased in the same direction with respect to the movement of the baffle 4 in the closing direction.
Can counter icing. On the other hand, in the case of the pulling force as in the first and second embodiments, the initial pulling force in the closing direction is a force having an angle with respect to the closing direction. It cannot be countered. When the baffle 4 is frozen in the open state as described above, if the baffle 4 is a compression coil spring, its spring force is reduced to 100%.
It can be used to release from freezing.

In place of the coil spring 15, a magnet is attached to the entire circumference or several places of the baffle 4.
A magnetic material such as iron may be attached to the entire periphery or several places of the opening forming portion 3a. In this case, a magnetic material may be used instead of the magnet, and the magnetic material may be a magnet, or both may be magnets. As described above, when the baffle 4 is brought into contact with the opening 3 using a magnet, a large driving force is required only by the stepping motor 1 or the like when the baffle 4 is separated from the opening 3. In the position, the baffle 4 is not loaded. For this reason, holding power such as day tent torque is hardly required. As a result, a drive source such as a motor can be reduced in size. In addition, it is preferable to use a plastic magnet as the magnet when the magnet is attached to the entire circumference of the baffle.

In each of the above-described embodiments, the case where the motor-type damper device of the present invention is used for controlling the cool air of the refrigerator has been described. The invention can be applied.

[0064]

As described above, claims 1 and 2
In the motor type damper device described in 2 , the motor is arranged on the side of the baffle, so that a part or all of the transmission means for transmitting the drive from the motor to the baffle can be easily arranged on the side of the baffle, and the base of the baffle can be easily arranged. It is not necessary to provide a space for the motor and the transmission means in the portion.
For this reason, the width of the baffle can be effectively used for the opening, and the opening can be enlarged. In addition, since the biasing means firmly closes the baffle by positively utilizing the mechanical margin that causes play, it is possible to completely shut off fluid such as cold air.

According to the third aspect of the present invention, since the shaft engaged with the baffle is formed by inserting a metal shaft, the strength can be secured. In addition, since the surroundings are made of resin, it is hard to freeze and the accuracy can be sufficiently secured and the cost can be reduced. In particular, since the motor is arranged on the side of the baffle, it is necessary to accurately and sufficiently transmit the drive of the motor to the shaft of the baffle on the side opposite to the side where the motor is arranged, The use of this axis is sufficient for this requirement.

Further, in the invention according to the fourth aspect , since the torsion coil spring is used as the urging means, the change in the spring pressure in opening and closing the baffle is reduced, and the drive mechanism is stabilized. In addition, since the torsion is caused by the torsion coil spring, icing hardly occurs at the contact portion and the holding portion of the torsion coil spring.

Further, in the motor type damper device according to the fifth aspect , since the baffle is provided inside the cylindrical frame, the damper device can be installed by fitting it to a cylindrical duct. For this reason, the space loss seen in the conventional damper device can be reduced. In addition, the cool air or the like flowing along the frame can be flowed along the frame as it is. Further, fluid flowing along the frame, for example, cold air in the refrigerator, flows straight along the frame. For this reason, the transmission loss of cold air or the like is eliminated, the fluid flows smoothly, and when used in a refrigerator, the refrigerator has high efficiency of cold air transmission and cold air diffusion.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of a motor-type damper device according to the present invention, wherein (A) is a cross-sectional view thereof, and (B) is an enlarged view 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.

FIGS. 4A and 4B are views showing a baffle used in the first embodiment shown in FIGS. 1 to 3, wherein FIG. 4A is a rear view, and FIG. 4B is a front view as viewed from an arrow B in FIG. (C) is a side view seen from arrow C of (A).

FIGS. 5A and 5B are diagrams showing axes used in the first embodiment shown in FIGS. 1 to 3, wherein FIG. 5A is a front view and FIG. 5B is a plan view.

FIG. 6 is a view for explaining a method of assembling the baffle and the shaft used in the first embodiment shown in FIGS. 1 to 3;
(A) is a plan view, and (B) is a view seen from the direction of arrow B in (A).

FIG. 7 is a sectional view showing an example of a refrigerator to which the motor type damper device of the present invention is applied.

FIGS. 8A and 8B are views showing a second embodiment of the motor type damper device of the present invention, wherein FIG. 8A is a sectional view thereof, and FIG. 8B is an enlarged view of a shaft portion thereof.

9 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 IX in FIG. 8;

FIG. 10 is a view seen from the direction of arrow X in FIG. 9, with the cover removed and a stepping motor virtually added.

FIGS. 11A and 11B are views showing a baffle used in the second embodiment shown in FIGS. 8 to 10, wherein FIG. 11A is a rear view and FIG.
3A is a front view as viewed from arrow B in FIG. 3A, FIG. 3C is a cross-sectional view taken along line CC in FIG. 3A, and FIG. 3D is a side view as viewed from arrow D in FIG.

FIGS. 12A and 12B are diagrams showing a shaft used in the second embodiment shown in FIGS. 8 to 10, wherein FIG. 12A is a front view, FIG. 12B is a sectional view taken along line BB of FIG. (C) is a side view seen from the direction of arrow C in (A), and (D) is a side view seen from the direction of arrow D in (A).

13A and 13B are diagrams showing a third embodiment of the motor type damper device of the present invention, wherein FIG. 13A is a cross-sectional view for explaining a state when a baffle is assembled, and FIG. It is sectional drawing at the time of.

FIG. 14 is a plan view as seen from a direction indicated by an arrow XIV in FIG. 13 (B).

FIG. 15 is a view seen from the direction of arrow XV in FIG.
It is the partially broken front view which omitted the front frame part and the opening formation part.

FIG. 16 is a front view of a conventional damper device.

FIG. 17 is a partially cutaway side view of FIG. 16;

FIG. 18 is a cross-sectional view showing an example of a refrigerator to which a conventional damper device is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stepping motor (motor) 2 Frame 3 Opening 3c Contact part 4 Baffle 4a, 4b Shaft 6 Pinion (transmission means) 7 Sector gear (transmission means) 13 Shaft (transmission means) 14 Soft tape 15 Coil spring (with Force means) 20 Metal shaft 21 Shaft (transmission means) g Gaps for play (play) h Gaps for play (play)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F25D 17/08 313

Claims (5)

(57) [Claims] 1. A motor, a baffle for opening and closing an opening through which a fluid flows, a transmission means for transmitting the drive of the motor to the baffle, and a biasing means for bringing the baffle into contact with the opening. the motor type damper device, the motor is arranged on the side of the baffle, the Ba
A part of the transmission means is formed in an engagement portion provided in the ruffle.
Shaft, and a pressing direction of the urging means to the engaging portion.
When the baffle is in the closed position, the baffle forms a play in the opening and closing direction, and the baffle is brought into close contact with the opening by the urging means. A motor type damper device characterized by the above-mentioned. 2. The motor and an opening through which a fluid flows are opened and closed.
And the drive of the motor is transmitted to the baffle.
Reach the transmission means and contact the baffle with the opening
Motor type damper device having biasing means
And place the motor on the side of the baffle.
The ruffle engages and forms part of the transmission means
A shaft and engaging with the shaft to form part of the transmission means
With a play that is a gap that can move in the rotation direction between the gears
When the baffle is in the closed position,
Form backlash in the opening and closing direction, and the urging means
Thus, it is noted that the baffle was brought into close contact with the opening.
Motor type damper device for a butterfly. 3. The shaft forming part of the transmission means.
Is made of resin with a metal shaft inserted inside.
The motor type damper device according to claim 1 or 2, wherein: 4. The torsion means is a torsion coil spring.
The motor type damper device according to claim 1 or 2, wherein: 5. A front end inside a cylindrical frame having both ends opened.
3. An opening according to claim 1, wherein said opening is formed.
The motor type damper device according to the above.