JP2834216B2 - Damper device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a damper device that controls the temperature in a refrigerator by opening and closing a cold air intake of a refrigerator.

2. Description of the Related Art In a refrigerator having a freezer compartment and a refrigerator compartment, cold air produced by an evaporator is sent into a refrigerator compartment through a duct. Here, the damper thermo is attached to the duct opening, and the motor performs the operation of opening the opening when the temperature in the refrigerating compartment rises and closing the opening when the temperature falls. For example, Japanese Utility Model Application Laid-Open No. 61-23673 and Japanese Utility Model Application
A description will be given of a damper thermostat disclosed in -205376. As shown in FIGS. 6 and 7, 1 is attached to the duct opening, a housing having an opening 2, 3 is a flap that operates to open and close the opening rotatably, and 4 urges the flap in a closing direction. It is a spring. 5 is an AC motor as a driving source,
Reference numeral 6 denotes a gear box for reducing the rotation of the motor 5, reference numeral 7 denotes a tilt cam interlocked with a gear, and reference numeral 8 denotes a pin which comes into contact with the tilt cam and opens and closes the flap 4.

The gear box 6 includes a motor output shaft 9, a first gear 10 meshing with the motor output shaft 9, a second gear 11 meshing with the first gear 10, a gear portion 12 a meshing with the second gear 11, and a projection 12 b having a large diameter portion and a small diameter portion. Is the third gear 12 with the inclination cam 7
It meshes with the number 12 gear. Reference numeral 13 denotes a reed switch, 14 denotes a magnet, 15 denotes a magnet holding plate, which is rotatably supported by the gear box 6, and is urged by a leaf spring 16 so as to always contact the projection 12b of the third gear 12. ing.

The operation will now be described. The motor 5 rotates according to the temperature in the refrigerator, and the rotation is performed by the motor output shaft 9 and the first gear 1.
It is transmitted to the 0th and 2nd gears 11 and the 3rd gear 12 and transmitted to the inclined cam 7. Here, the rotation of the inclined cam 7 changes the pin 8 into a linear motion, displaces the flap 3 in the opening direction against the urging force of the spring 4, and displaces the flap 3 to close by the urging force of the spring 4. Can be done. Here, it is necessary to stop the rotation of the motor 5 at the opening and closing points of the flap 3. For this reason, a projection 12b is provided on the third gear 12 that moves in conjunction with the inclined cam 7, and when the flap 3 is open, the magnet holding plate 15 contacts the large diameter portion to turn on the reed switch 13 and close the flap 3 At this time, the driving of the motor 5 is stopped by making the reed switch 13 be turned off by making contact with the small diameter portion.

Problems to be Solved by the Invention However, in the above configuration, there is a possibility that the open / close positions of the flap may vary due to the variation of each gear, magnet, and reed switch. In addition, parts such as a reed switch, a magnet, and a wiring board are required, and there is a problem that assembling takes a long time. There were problems that were not guaranteed enough.

An object of the present invention is to provide a damper device that is inexpensive, has a simple structure, and reliably opens and closes without detecting the opening and closing of the flap by electrical means.

Means for Solving the Problems In order to solve the above problems, the present invention is provided at a cool air inflow duct port, has an inlet portion and an outlet portion for the cool air, and has a rotary rotor blade between the inlet portion and the outlet portion. It comprises a housing having an opening to be opened and closed and a drive source for driving the rotor, comprising a magnet on the output shaft of the drive source, a magnetic body integrally with the rotor, or conversely, an output shaft of the drive source. In this configuration, a magnetic body is provided, a magnet is integrally provided with the rotor, and the output shaft and the rotor are transmitted by the magnetic force of the magnet.

Operation Due to the above configuration, when the opening is opened and closed by the rotor blade, the output of the drive source is normally transmitted from the output shaft to the rotor by the magnetic force of the magnet to rotate the rotor, and the opening is closed by the rotor blade. At this time, the rotor blades come into contact with the opening, and the output from the drive source is set in a control circuit so that the output shaft keeps its state while the output shaft idles, and outputs a signal to the drive source only for a certain period of time. In other words, the drive source is driven for a certain period of time and stops.

Embodiment One embodiment of the first embodiment of the present invention will be described in detail with reference to FIGS. 1, 2, and 5. FIG. Reference numeral 20 denotes a rectangular housing having an annular recess 20a, one bottom surface 21 and four side surfaces 22. One of the side surfaces has a cool air inlet 23, and the cool air inlet 23 is a duct opening. (Not shown). The inflow port 23 communicates with the annular recess 20a, and the annular recess 20a is formed on a side surface perpendicular to the inflow port 23.
It has two outlets 24a and 24b communicating with the outlet. The annular recess 20a between the inlet 23 and the outlets 24a, 24b has about 12
Two openings 25a, 25b are formed at an angle of 0 ° from the center of the housing 20 to the outside corresponding to the respective outlets 24a, 24b. Each of the openings 25a and 25b includes four outer frames 26 and a window 27. The central portion of the housing 20 has a cylindrical protrusion 28, the cylindrical protrusion 28 is provided, and the cylindrical protrusion 28 is hollow. Further, a convex portion 29 protruding at an angle of about 60 ° from the opening 25a is formed in the annular concave portion 20a of the housing 20. The cylindrical projection 28 of the housing 20 houses a DC motor 30 as a drive source, an output gear 31 thereof, and a disc-shaped base plate 33 holding the DC motor 30 and holding a reduction gear 32. The output shaft 34, which is the final output stage of the reduction gear 32, includes a gear portion 34a meshing with the reduction gear 32, a disk-shaped protrusion 34b, and a hole 34c, and is provided at the center of the cylindrical protrusion 28 of the housing 20. It is held by embedded guide pins 35. A concave portion 34d is formed in the disk-shaped projecting portion 34b of the output shaft 34, which is the final output stage. The concave portion 34d is strong so that the cylindrical magnet 36, which is magnetized to four poles in the circumferential direction, does not rotate. Press-fit. Further, a rotor 37 rotatably attached to the cylindrical projection 28 of the housing 20 is fitted. The rotor 37
Is a rectangular blade portion 3 attached to the cylindrical portion 37a at an angle of about 120 ° which rotates in the cylindrical concave portion 20a of the housing 20 and the cylindrical portion 37a fitted on the outer periphery of the cylindrical projecting portion 28.
7b, 37c, 37d and a cylindrical convex portion 37e provided at the center of the inside of the cylindrical portion 37a of the rotor 37. The outer diameter of the convex portion 37e is slightly smaller than the inner diameter of the magnet 36. The protrusion
The magnetic body 38 is firmly pressed into 37e. Magnetic body 38
A hole 38a is formed at the center of the hole 38a so as to freely slide with the guide pin 35. The magnetic body 38 press-fitted into the cylindrical convex portion 37e of the rotor 37 is inside a cylindrical, circumferentially magnetized magnet 36 press-fitted into the output shaft 34, which is the final output stage of the reduction gear 32. The hole 38a through which the magnetic body 38 penetrates is fitted to the guide pin 35 and is rotatably mounted. The blades 37b, 37 of the rotor 37
A high-density foam sealing material 39 is attached to the surface of the housing c that comes into contact with the openings 25a and 25b of the housing 20, and is positioned to open and close the openings 25a and 25b by the rotation of the rotor 37. The remaining 37d of the blade portion is the convex portion 29 of the housing 20.
When the rotor 37 completely opens the openings 25a, 25b, the rotor 37 is in contact with the rotor 37. Also, the bottom surface 21 of the housing 20
A cover 40 that covers the side facing the housing 20 is attached to the housing 20 by screws 41.

Here, the operation of the first embodiment of the present invention will be described.

When the temperature inside the refrigerator becomes lower than a predetermined temperature by a temperature sensor (not shown) in the refrigerator, a signal is input to CH1 of the circuit of FIG. 5, a drive signal is input to the motor 30, and a reduction gear is input to the motor 30.
The rotation is transmitted to the output shaft 34 which is the final output stage via 32. Here, the magnet 36, which is press-fitted into the output shaft 34, which is the final output stage, and is magnetized to four poles in the circumferential direction,
The rotor 37 is driven by the magnetic force of the magnet 36 and the magnet 36 pressed into the convex portion 37e of the
Rotate 25b in the closing direction. Here, the blades 3 of the rotor 37
When the openings 7b and 37c come into contact with the openings 25a and 25b, the rotor 37 does not rotate, but the motor 30, the output shaft 34 and the magnet 36, which are the final output stage, are magnetically pressed into the protrusions 37e of the rotor 37. It rotates in a direction that cuts the magnetic speed with the body 38. The drive signal is a circuit that is output only for a time slightly longer than the time when the rotor 37 closes the openings 25a and 25b.
After closing 25b, it rotates and stops for a while, and holds rotor 37 at that position.

Conversely, when the internal temperature rises, a signal is input to CH2 in the circuit of FIG. 5 and a drive signal is input to the motor 30, and the motor 30 rotates in a direction to reversely open the openings 25a and 25b. Here, the blade portion 37d of the rotor 37 comes into contact with the convex portion 29 protruding from the annular concave portion 20a of the housing 20, and the openings 25a and 25b are fully opened and held. Here, the motor 30 continues to rotate in the same manner as described above, but the output shaft 34 and the magnet 36, which are the final output stages of the motor 30, cut off the magnetic speed with the magnetic body 38 press-fitted into the convex portion 37e of the rotor 37. , And the rotor 37 does not rotate. Since the drive signal is a circuit that is output slightly longer than the opening time of the rotor 37, the motor 30 is rotated and stopped for a while after the openings 25a and 25b are opened.

As described above, in a damper device provided with a blade portion on a rotary rotor and having an opening which is opened and closed by the blade portion, a drive source for driving the rotor, and a magnet provided on an output shaft which is a final output stage of the drive source. Since the rotor is integrally provided with the magnetic body and the output shaft and the rotor are transmitted by the magnetic force of the magnet, the opening and closing of the opening by the blades of the rotor can be performed without using an electrical switch. By simply setting the output time of the signal for driving the power source to be slightly longer than the time required for opening and closing the opening, the rotor is reliably held in the open and closed positions, and the drive source output shaft runs idle with the rotor without frictional resistance. Therefore, there is no change in the opening force and the closing force due to wear, and there is no damage because the gears and the motor are not locked in the output state. or,
The number of parts is small and assembly is easy.

An embodiment according to claim 2 of the present invention will be described below with reference to FIGS. A concave portion 34d 'is formed in the disk-shaped projecting portion 34b' of the output shaft 34 ', which is the final output stage, and the concave portion 34d'
34d 'includes a magnetic body 38 having a hole 38a penetrated in the center.
Is firmly pressed in so as not to rotate. Rotor 37 '
A cylindrical convex portion 37e 'is formed at the center of the inside of the cylindrical portion 37a'. The cylindrical convex portion 37e 'prevents the magnet 36' which is cylindrical and magnetized in four poles in the circumferential direction from rotating. Pressed firmly. The outer diameter of the disk-shaped projection 34b 'of the output shaft 34', which is the final output stage, is slightly smaller than the inner diameter of the magnet 36 ', and is embedded in the center of the cylindrical projection 28' of the housing 20 '. A guide pin 35 'penetrates a hole 34c' provided in the output shaft 34, which is the final output stage, and is rotatably fitted and held. The distal end 35a of the guide pin 35 'is rotatably fitted in a concave portion 37f provided in the center of the cylindrical portion 37a' of the rotor 37 ', and the rotor 37' is held. Other configurations are the same as those in FIG. 1 and FIG.
The operation of the second embodiment constructed as described above differs from that of the first embodiment in that the magnetic body 38 'is press-fitted into the output shaft 34', which is the final output stage, and the rotor 3
The point that the magnet 36 'is press-fitted into 7' is the same as the content of claim 1. Therefore, the effect is the same as that of the first aspect.

Effect of the Invention As described above, the present invention is provided at a cool air inflow duct, has an outlet communicating with the cool air inlet, and a housing provided with an opening between the inlet and the outlet, A rotor having a blade portion rotatably provided in the housing and opening and closing the opening; and a drive source for driving the rotor, the output source of the drive source includes a magnet, and is integrally formed with the rotor. With a magnetic material, and conversely, with a magnetic material on the output shaft of the drive source, with a magnet integrated with the rotor,
Since the output shaft and the rotor are transmitted by the magnetic force of the magnet, the opening and closing of the opening by the blade of the rotor can be performed without using an electric switch. By simply setting the time slightly longer than the time required for the rotor, the rotor is reliably held in the open and closed positions, and the output shaft of the drive source idles with the rotor without friction resistance, so there is no change in the opening and closing forces due to friction. Also, since the gears and the motors are not locked in the output state, they are not damaged, so that a highly reliable damper device that meets the needs of the customer can be constructed, and its practical effect is large. .

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of one embodiment of the damper device of the present invention according to claim 1, FIG. 2 is a sectional view of a principal part of the damper device of FIG. 1, and FIG. 3 is a claim of the damper device of the present invention. FIG. 4 is an exploded perspective view of one embodiment of FIG. 2, FIG. 4 is a sectional view of a main part of the damper device of FIG. 3, FIG. 5 is a drive circuit diagram of the damper device of FIG. 1 and FIG. FIG. 7 is a detailed view of the gear portion of the damper thermostat in FIG. 20,20 ′… Housing, 23… Inlet, 24a, 24b…
Outlet, 25a, 25b Opening, 30 Drive source, 34, 34 '
... output shaft, 36, 36 '... magnet, 37, 37' ... rotor, 38, 38 '... magnetic material, 37b, 37c ... blade.

Claims (2)

(57) [Claims] A housing provided at an outlet of the cool air inflow duct and having an outlet communicating with the inlet of the cool air, and an opening provided between the inlet and the outlet; A rotor that is rotatably provided and has a blade portion that opens and closes the opening, and a drive source that drives the rotor; a magnet is provided on an output shaft of the drive source; and a magnetic body is provided integrally with the rotor, An output shaft and a rotor are conducted by a magnetic force of the magnet. 2. A housing installed at a cool air inlet duct, having an outlet communicating with the cool air inlet, and an opening provided between the inlet and the outlet; A rotor that is rotatably provided and has a blade that opens and closes the opening, and a drive source that drives the rotor; a magnetic body is provided on an output shaft of the drive source; and a magnet is provided integrally with the rotor. An output shaft and a rotor are conducted by a magnetic force of the magnet.