JP2760443B2 - Cool air flow control device - Google Patents

Description

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

2. Description of the Related Art In a refrigerator having a freezer compartment and a refrigerator compartment, cold air generated by an evaporator is sent into the refrigerator compartment through a duct. Here, the cool air flow control device is attached to the duct opening, and performs an operation of opening the opening when the temperature in the refrigerator rises and closing it when the temperature falls in the refrigerator. For example, Japanese Utility Model Laid-Open No. 61-23673 and Japanese Utility Model Laid-Open No. 61-2
A cool air flow control device disclosed in Japanese Patent Publication No. 05376 will be described. As shown in FIGS. 4 and 5, 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, a large-diameter portion, and a projection from a small-diameter portion. The third gear 12 having 12b, and the inclined cam 7 is 3
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. Have been.

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 tilt cam 7 converts 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 positions of opening and closing 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, which takes time to assemble. In addition, when the reed switch is mounted, a problem such as chipping of a glass tube occurs, and the contact is reliably opened and closed. However, there was a problem that was not sufficiently guaranteed.

An object of the present invention is to provide a cool air flow control device which is inexpensive, has a simple structure, and reliably opens and closes without detecting the opening and closing of the flap by electric 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 cool air, and is opened and closed by a blade of a rotary rotor between the inlet portion and the outlet portion. And a drive source for driving the rotor. The output shaft of the drive source and the rotor are transmitted by a torsion force.

When the opening is opened and closed by the rotor blades due to the above configuration, the output of the drive source is transmitted from the output shaft to the rotor by a torsion force, the rotor rotates, and the opening is closed by the rotor blades. When the rotor blade contacts the opening, the output from the drive source keeps its state while the output shaft rotates, and the control circuit is set so that the signal to the drive source is output only for a certain fixed time. The driving source is driven for a certain period of time and stops.

Embodiment An embodiment of the present invention will be described in detail with reference to FIGS. Reference numeral 20 denotes a rectangular housing, which is an annular recess 20a.
It has one bottom surface 21 and four side surfaces 22. One of the side surfaces has a cool air inlet 23, which communicates with a duct port (not shown). The inflow port 23 is
Two outlets 24a, 24b communicating with the annular recess 20a and having a side surface perpendicular to the inlet 23 communicating with the annular recess 20a.
have. The annular recess 20a between the inlet 23 and the outlets 24a, 24b has two openings 25a at an angle of about 120 °.
25b is formed outward from the center of the housing 20 corresponding to the respective outlets 24a, 24b. Openings 25a, 25b
Consists of four outer frames 26 and a window 27. Housing 20
Has a cylindrical protrusion 28 at the center thereof, and the protrusion 28 is hollow. The opening 2 in the annular concave portion 20a of the housing 20
There is a projection 29 protruding from the annular recess 20a at an angle of about 60 ° with 5a.

The cylindrical protrusion 28 of the housing 20 houses a DL motor 30 as a drive source, an output gear 31 thereof, and a disk-shaped base 33 holding the motor 30 and holding a reduction gear 32. The final output shaft 34 of the reduction gear 32 is the reduction gear 32
The housing 20 includes a gear portion 34a that meshes with a cylindrical projection 34b, and is held by guide pins 35 embedded in the housing 20 and the cylindrical projection 28.

Further, a rotor 36 rotatably mounted on the cylindrical projection 28 of the housing 20 is fitted. The rotor 36 has a cylindrical portion 36 that fits around the outer periphery of the cylindrical protrusion 28.
about 120 ° to rotate inside the annular recess 20a of the housing 20
Of the rectangular blades 36b, 36c, 36d attached to the cylindrical portion 36a at an angle and a concave portion 36e provided in the center of the cylindrical portion 36a, and the concave portion 36e is the final output of the reduction gear 32. The protrusion 34b of the shaft 34 is fitted into the press fit without permission. A high-density foam sealing material 37 is affixed to a surface of the blades 36b, 36c of the rotor 36 that comes into contact with the openings 20a, 25b of the housing 20, and a position for opening and closing the openings 25a, 25b by rotation of the rotor 36. It is in. The remaining 36d of the blade part is the housing 20
Of the housing 20 and the rotor 36 or the openings 25a and 25b are arranged to be in contact with each other when the openings 25a and 25b are completely opened.
A cover 38 covering the side facing the bottom surface 21 is mounted on the housing 20 by screws 39.

Here, the operation of the embodiment of the present invention will be described. When the temperature in the refrigerator becomes lower than a predetermined temperature by a temperature sensor (not shown) in the refrigerator, a drive signal is input to the motor 30 at CH ₁ of the circuit of FIG. The rotation is transmitted to. Here, since the rubber protrusion 34b of the final output shaft 34 is transmitted via the recess 36e of the rotor 36 and the lashing force, the rotor 36 rotates in a direction to close the openings 25a and 25b. Here, when the blades 36b, 36c of the rotor 36 come into contact with the openings 25a, 25b, the rotor 36 does not rotate, but the motor 30 and the final output shaft 34 rotate while sliding in the recess 36e of the rotor 36. Since the drive signal is output for a time slightly longer than the time when the rotor 36 closes the openings 25a and 25b, the rotor 36 slides for a while after the openings 25a and 25b are closed, and then stops. And held in that position.

Conversely, when the internal temperature rises, the motor 30 drive signal enters CH ₂ in the circuit of FIG. 3 and the motor 30 rotates in the reverse direction to open the openings 25a, 25.
Rotate to open b. Here, the blades 3 of the rotor 36
6d, the convex portion 29 protruding from the annular concave portion 20a contacts the opening 2
5a and 25b are fully opened and held. Here, the motor 30 continues to rotate in the same manner as described above, but the motor 30 and the final output shaft 34 rotate while sliding in the concave portion of the rotor 36, and the rotor 36 does not rotate. Since the driving signal is a circuit that is output slightly longer than the opening time of the rotor 36, the motor 30 is rotated for a while after the openings 25a and 25b are opened and stopped.

As described above, a rotor is provided with a blade portion, and in a damper thermometer having an opening which is opened and closed by the blade portion, a drive source for driving the rotor and a final output shaft of the drive source are formed of cylindrical rubber by a rotor rubber. The opening and closing of the opening by the rotor blades can be made shorter than the time required for opening and closing the opening by opening the opening by the rotor blades without using an electrical switch.で Just by setting the length longer, the rotor is securely held in the open and closed positions and rotates around the output shaft of the drive source, so that the gears and the motor are not damaged. It is easy to assemble and the number of parts is small.

Effects of the Invention As described above, the present invention provides a housing provided at an inlet of a cool air inlet duct, having an outlet communicating with the inlet of the cool air, and having an opening between the inlet and the outlet. A rotor having a blade portion rotatably provided in the housing for opening and closing the opening, and a drive source for driving the rotor; an output shaft of the drive source and the rotor are transmitted by a torsion force; Therefore, the opening and closing of the opening by the rotor blades is not particularly performed by using the electrical detection means, and the drive source drive signal output time is set slightly longer than the time required for opening and closing the opening, and the rotor is opened and closed. And the drive source output shaft is turned around, so that the gear drive unit is not damaged, and it can be provided at low cost because it is easy to assemble and the number of parts is small.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment of a cool air flow control device of the present invention, FIG. 2 is a sectional view of a main part of FIG. 1, FIG. 3 is a drive circuit diagram of FIG. 1, and FIG. FIG. 5 is a detailed view of the gear portion of the example of FIG. 20 ... housing, 23 ... inlet, 24a, 24b ... outlet, 25a, 25b ... opening, 30 ... drive source, 34 ... output shaft, 36 ... rotor, 36b, 36c ... Blade part, 36e ... recess.

Claims (1)

(57) [Claims] A housing provided at an outlet of the cool air inflow duct, having an outlet communicating with the inlet of the cool air, and having an opening provided between the inlet and the outlet; A rotor having a blade portion movably provided to open and close the opening; and a drive source for driving the rotor. The output shaft of the drive source, and the rotor has a concave portion engaged with the output shaft. A cool air flow control device characterized by being transmitted by a force.