JP2769309B2 - Damper opening and closing 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 opening / closing device for adjusting a flow rate in a refrigerating room or a switching room of an electric refrigerator or the like.

[0002]

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 out through a duct into the refrigerator compartment.

Here, the damper opening / closing device is mounted on a duct opening and uses a shape memory alloy coil spring to open the opening when the temperature in the refrigerator rises and close it when the temperature falls. .

FIG. 4 shows a conventional damper opening / closing device.
This will be described with reference to FIG. In the drawing, reference numeral 1 denotes a substrate having an opening 2, which is attached to a duct opening. Reference numeral 3 denotes an opening / closing plate rotatably supported by the substrate 1 so that the opening 2 can be opened and closed. Reference numeral 3a denotes a sealing member attached to the opening / closing plate 3 to seal the opening 2. 4 is the open / close plate 3
In the closing direction.

[0005] Reference numeral 5 denotes a shape memory alloy coil spring which is locked to the opening / closing plate 3 and the substrate 1 by hook portions 5a at both ends, and opens the opening / closing plate 3 against the spring force of the spring 4 when contracted. Work on. Reference numeral 6 denotes a linear heater wound around a wire portion of the shape memory alloy coil spring 5, and both ends are connected to a lead wire 7.

Next, the operation will be described. When the temperature in the refrigerator compartment is higher than the set value, the heater 6 is energized by the control circuit, and the heat generated by the heater 6 transforms the shape memory alloy coil spring 5 from a martensite phase to an austenite phase and contracts. Then, the opening / closing plate 3 is rotated in the opening direction, and cool air flows into the refrigerator from the opening 2.

Conversely, when the temperature in the refrigerator becomes lower than the set value, the control circuit stops the supply of power to the heater 6, the temperature of the shape memory alloy coil spring 5 falls, the phase changes from the austenite phase to the martensite phase, and the output changes. The opening and closing plate 3 is rotated in the closing direction by the spring 4 so that the opening and closing
The sealing member 3a attached to the substrate closes the opening 2 of the substrate 1 and stops the flow of cold air into the refrigerator compartment.

[0008]

However, since the shape memory alloy coil spring 5 of the conventional damper opening / closing device is directly attached to the opening / closing plate 3 and the substrate 1 by the hook portions 5a at both ends thereof, stress is applied to the hook portions 5a. Tends to concentrate, and there is a possibility that the hook portion 5a may be deformed particularly at a low temperature, so that the opening and closing performance cannot be guaranteed for a long period of time.

Further, the connection between the heater 6 and the lead wire 7 is separated from the winding portion of the heater 6 in the shape memory alloy coil spring 5, and the length of the drawing out from the winding portion of the heater 6 is long. As the position of the part becomes unstable, connection work takes time,
Since the length of the heater 6 pulled out from the winding part is long, there is also a problem that too much force is applied when the end of the heater 6 is drawn in the assembling process, and the heater 6 is disconnected.

If the lead wire 7 is insufficiently fixed to the substrate 1, if the lead wire 7 is pulled by mistake, the connection between the heater 6 and the lead wire 7 may be disconnected or the heater 6 may be disconnected. There was also the problem of doing.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and a highly reliable damper opening / closing device that does not deform a shape memory alloy spring, can easily connect a lead wire and a heater wire, and is free from disconnection. The purpose is to provide.

[0012]

In order to achieve the above object, the present invention provides a pair of holders having a plurality of holes into which the ends of a shape memory alloy coil spring are inserted and held, and a holding portion for holding a lead wire. And the shape memory alloy coil spring is attached to the opening / closing plate and the substrate via the holder.

As a result, there is no deformation of the shape memory alloy coil spring, and the work of connecting the lead wire and the heater wire is simple.
It is possible to obtain a highly reliable damper opening / closing device without fear of disconnection.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A damper opening / closing device according to the present invention comprises a substrate having an opening, an opening / closing plate pivotally supported by the substrate to open and close the opening, and closing (or opening) the opening / closing plate. ), A shape memory alloy coil spring that opens and closes the open / close plate against the spring, a heater wound around a wire portion of the shape memory alloy coil spring, and both ends of the heater electrically. A pair of lead wires to be connected, a pair of holders having a plurality of holes into which the ends of the shape memory alloy coil spring are inserted and held, and a holding portion holding the lead wire, wherein the shape memory alloy coil spring is It is attached to the opening / closing plate and the substrate via the holder.

In the present invention, the shape memory alloy coil spring is
Since the end of the shape memory alloy coil spring is attached to the opening / closing plate and the substrate via a holder having a plurality of holes into which the ends are inserted and held, the stress applied to the shape memory alloy coil spring is brought into contact with the plurality of holes of the holder. Therefore, deformation of the shape memory alloy coil spring can be prevented.

Further, in the present invention, since the holder is provided with the holding portion for holding the lead wire, the connecting portion between the heater and the lead wire can be brought close to the winding portion of the heater in the shape memory alloy coil spring. Since the length of the drawer from the winding portion can be shortened, the position of the end of the heater is stabilized, the connection work does not take much time, and the heater does not break due to the drawing of the end of the heater.

Also, since the holder is provided with a holding portion for holding the lead wire, even if the lead wire is pulled by mistake, the pulling force can be received by the holder. Never reach.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. In the figure, reference numeral 10 denotes a substrate having an opening 11, which is attached to a duct opening.
Reference numeral 12 denotes an opening and closing plate which is rotatably supported by the substrate 10 so that the opening 11 can be opened and closed. Reference numeral 12a denotes a sealing member attached to the opening / closing plate 12 to seal the opening 11. Reference numeral 13 denotes a spring which is hooked on the opening / closing plate 12 and the substrate 10 and biases the opening / closing plate 12 in the closing direction.

Reference numeral 14 denotes a shape memory alloy coil spring, around which a linear heater 15 having an insulating coating is wound, and the coil end is passed through four or more holes 16a provided in a flat holder 16. Is locked to the opening / closing plate 12 and the substrate 10 via the hook portion 16b of the holder, and acts in the direction of opening the opening / closing plate 12 against the spring force of the spring 13 when contracted. The holder 16 has an L-shaped projection 17 and a lead wire 18 connected to an external power supply.
The connection between the heater and the heater 15 is fixed to the L-shaped projection 17 after insulation treatment.

Next, the operation will be described. When the temperature in the refrigerator compartment is higher than the set value, the control circuit energizes the heater 15, and the heat generated by the heater 15 transforms the shape memory alloy coil spring 14 from a martensite phase to an austenite phase and contracts. , Spring 13
The opening / closing plate 12 is rotated in the opening direction against the pressure, and cool air flows into the refrigerator through the opening 11.

Conversely, when the temperature in the refrigerator becomes lower than the set value, the control circuit stops the supply of power to the heater 15, and the temperature of the shape memory alloy coil spring 14 changes from the austenitic phase to the martensite phase and the output decreases. To do
The opening / closing plate 12 is rotated in the closing direction by the spring 13 to close the opening 11 of the substrate 10 and stop the flow of cool air into the refrigerator compartment.

As described above, in the damper opening / closing device of the present embodiment, the shape memory alloy coil spring 14 is connected to the holder 16 having the plurality of holes 16a into which the ends of the shape memory alloy coil spring 14 are inserted and held. Since it is attached to the opening / closing plate 12 and the substrate 10, the stress applied to the shape memory alloy coil spring 14 is
6a, so that the shape memory alloy coil spring 14 can be prevented from being deformed.

Further, since the L-shaped projection 17 for holding the lead wire 18 is provided on the holder 16, the connecting portion between the heater 15 and the lead wire 18 is brought close to the winding portion of the heater 15 in the shape memory alloy coil spring 14. Since the length of the heater 15 drawn out from the winding portion can be shortened, the position of the end of the heater 15 is stabilized, the connection work does not take much time, and the heater 15 is disconnected by drawing the end of the heater 15 around. Disappears.

Further, since the L-shaped protrusion 17 for holding the lead wire 18 is provided on the holder 16, even if the lead wire 18 is pulled by mistake, the pulling force is not applied to the holder 16.
Therefore, no force is applied to the connection between the heater 15 and the lead wire 18 or the heater 15.

[0025]

As described above, according to the present invention, the shape memory alloy coil spring is attached to the opening / closing plate and the substrate via the holder having a plurality of holes into which the ends of the shape memory alloy coil spring are inserted and held. The stress applied to the shape memory alloy coil spring is distributed and applied to the contact portions of the holder with the plurality of holes, thereby preventing the deformation of the shape memory alloy coil spring and improving the reliability of the shape memory alloy coil spring. be able to.

Further, in the present invention, since the holder is provided with the holding portion for holding the lead wire, the connection portion between the heater and the lead wire can be brought close to the winding portion of the heater in the shape memory alloy coil spring. Since the length of the drawer from the winding portion can be shortened, the position of the end of the heater is stabilized, the connection work does not take much time, and the heater does not break due to the drawing of the end of the heater. Also, even if you accidentally pull the lead wire,
Since the holder receives the pulling force, no force is applied to the connection between the heater and the lead wire or the heater. Therefore, it is possible to obtain a highly reliable damper opening / closing device in which the connection between the lead wire and the heater wire is simple and there is no risk of disconnection.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a damper opening / closing device according to the present invention.

FIG. 2 is a perspective view of a main part of the damper opening / closing device of the embodiment.

FIG. 3 is an essential part perspective view showing a holder of the damper opening / closing device of the embodiment.

FIG. 4 is a sectional view of a conventional damper opening / closing device.

FIG. 5 is a front view of a main part of the conventional damper opening / closing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Substrate 11 Opening 12 Opening / closing plate 13 Spring 14 Shape memory alloy coil spring 15 Heater 16 Holder 16a Hole 17 L-shaped projection 18 Lead wire

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model 62-194938 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) F25D 17/08 316

Claims (1)

(57) [Claims] A substrate having an opening, an opening and closing plate pivotally supported by the substrate to open and close the opening, a spring for urging the opening and closing plate in a closing (or opening) direction, A shape memory alloy coil spring that opens and closes the open / close plate against a spring, a heater wound around a wire portion of the shape memory alloy coil spring, and a pair of lead wires electrically connected to both ends of the heater; It comprises a pair of holders having a plurality of holes in which the terminals of the shape memory alloy coil spring are inserted and held and a holding portion for holding the lead wire,
The damper opening / closing device, wherein the shape memory alloy coil spring is attached to the opening / closing plate and the substrate via the holder.