JPH079337B2 - Damper opening and closing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper opening / closing device for adjusting the flow rate of cold air in a refrigerating room such as an electric refrigerator or a switching room.

2. Description of the Related Art In a refrigerator having a freezer compartment and a refrigerating compartment, cold air produced by an evaporator is sent into the refrigerating compartment through a duct.

Here, the damper opening / closing device is attached to the duct port, and the shape memory alloy coil spring performs an operation of opening the opening when the temperature inside the refrigerating chamber rises, and conversely closing it when the temperature falls.

A conventional damper opening / closing device will be described with reference to FIGS. 4 and 5. Reference numeral 1 is a substrate attached to the duct opening and having an opening 2. Reference numeral 3 denotes an opening / closing plate which is rotatably attached to open / close the opening 2. Reference numeral 3a is a seal member attached to the opening / closing plate 3 to seal the opening 2.

Reference numeral 4 denotes a spring that biases the opening / closing plate 3 in the closing direction. Numeral 5 is a shape memory alloy coil spring, which is rotatably attached to the opening / closing plate 3 and the substrate 1 by the hook portions 5a at both ends, and acts in a direction to open the opening / closing plate 3 against the spring force of the spring 4 when contracting. Is positioned and locked.

A linear heater 6 is wound around the shape memory alloy coil spring wire rod portion 5, and both ends thereof are connected to the lead wire 7. Next, the operation will be described. When the temperature in the refrigerating chamber is higher than the installation value, the heater 6 is energized by the control circuit, and the heat generation of the heater 6 causes the shape memory alloy coil spring 5 to transform from the martensite phase to the austenite phase and contract, thereby resisting the spring 4. The opening / closing plate 3 is rotated in the opening direction to allow cold air to flow into the refrigerator through the opening. On the contrary, when the temperature in the refrigerating chamber becomes lower than the set value, the control circuit stops the energization of the heater 6, and the temperature of the shape memory alloy coil spring 5 is transformed from the down austenite phase to the martensite phase and the output is reduced. The opening / closing plate 3 is rotated in the closing direction by 4 and the sealing member 3a attached to the opening / closing plate 3
Closes the opening 2 of the substrate 1 to stop the cold air from flowing into the refrigerating chamber.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above configuration, since the opening / closing plate using the shape memory alloy coil spring is performed at the hook portion of the shape memory alloy coil spring, stress is likely to be concentrated on the hook portion, especially at low temperature. As a result, the hook portion may be deformed and the opening / closing performance cannot be guaranteed for a long period of time. Further, since the connecting portion between the heater and the lead wire is in a hollow state, it takes a long time to perform the connecting work, and there is a problem that an excessive force is applied during the connecting work and assembling to break the wire.

The present invention is to provide a damper opening / closing device which is inexpensive, has no deformation of the shape memory alloy spring, is easy to connect the lead edge and the heater wire, and is free from the risk of disconnection.

Means for Solving the Problems In order to solve the above problems, the present invention relates to a substrate having an opening, an opening / closing plate that is rotatably supported by the substrate to open and close the opening, and the opening / closing plate is closed (or opened). And a shape memory alloy coil spring that opens and closes the opening and closing plate against the spring, the shape memory alloy coil spring comprising:
A heater is wound around the wire member, and the end of the shape memory alloy coil spring is held by a holder having a flat plate shape and a plurality of holes, and the holder keeps the connection portion between the heater and the lead wire of the shape memory alloy coil spring. The shape memory alloy coil spring has a holding portion and is attached to the opening / closing plate and the substrate via the holder.

With the above configuration, the opening / closing plate is rotated by the expansion / contraction of the shape memory alloy coil spring, not through the hook portion of the spring but through the holder by connecting the coil end of the terminal and the holder. Also, assembling, coil the heater to the shape memory alloy coil spring, attach the holder, connect the heater and the lead wire, fix the connection part to the protrusion of the holder, and lock the holder to the open / close plate and the board. To do.

Embodiment An embodiment of the present invention will be described in detail with reference to FIGS. Reference numeral 10 is a substrate attached to the duct opening and having an opening 11. Reference numeral 12 denotes an opening 11 that is rotatably supported by the substrate 10.
An opening / closing plate that opens and closes is a seal member that is attached to the opening and closing plate 12 and seals the opening 11.

Reference numeral 13 is a spring installed on the opening / closing plate 12 and the substrate 10 to urge the opening / closing plate 12 in the closing direction.

Reference numeral 14 is 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 plate-shaped holder 16, and It is rotatably attached to the opening / closing plate 12 and the substrate 10 via the hook portion 16b, and is installed so as to work in the direction of opening the opening / closing plate 12 against the spring force of the spring 13 when contracted. Has been done. Also, the holder 16
The connecting portion between the lead wire 18 and the heater 15, which has an L-shaped protrusion 17 and is connected to an external power source, is fixed to the L-shaped protrusion 17 after being insulated.

Here, 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 causes the shape memory alloy coil spring 14
Transforms from the martensite phase to the austenite phase and contracts, and rotates the opening / closing plate 12 in the opening direction against the spring 13 via the holder 16, causing cold air to flow into the chamber through the opening 11.

On the contrary, when the temperature in the refrigerating chamber becomes lower than the set value, the control circuit stops the energization of the heater 15, and the temperature of the shape memory alloy coil spring 14 decreases from the austenite phase to the martensite phase and the output decreases. 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 inflow of cold air into the refrigerating chamber.

As described above, the substrate having the opening, the opening / closing plate pivotally supported by the substrate to open / close the opening, the spring for urging the opening / closing plate in the opening direction, and the opening / closing plate against the urging spring are provided. A damper opening / closing device comprising a shape memory alloy coil spring that is opened and closed and coiled a linear heater, having a plurality of holes at both ends of the shape memory alloy coil spring through which the shape memory alloy coil spring is inserted, and connecting the heater and the lead wire. By providing a holder with a protrusion for holding the shape memory alloy coil spring and a hook part for adjusting the shape memory alloy coil spring between the opening and closing plate and the substrate, stress concentration on the shape memory alloy coil spring can be relaxed when the opening and closing plate is opened and closed. , The reliability can be improved.

Also, assembling, coil the heater to the shape memory alloy coil spring, attach the holder, connect the heater and the lead wire, fix the connection part to the protrusion of the holder, and lock the holder to the open / close plate and the board. Since it is carried out, the heater is not overloaded, there is no fear of disconnection, and it is simple.

EFFECTS OF THE INVENTION As described above, the present invention includes a substrate having an opening,
An opening / closing plate that is rotatably supported by the substrate to open and close the opening,
A spring for urging the opening / closing plate in the closing (or opening) direction and a shape memory alloy coil spring for opening / closing the opening / closing plate against the urging spring. The shape memory alloy coil spring has a heater wound around a wire member. The end of the shape memory alloy coil spring is held by a holder having a flat plate shape and a plurality of holes, and the holder has a holding portion for holding a connecting portion between the heater and the lead wire of the shape memory alloy coil spring. Since the shape memory alloy coil spring is configured to be attached to the opening / closing plate and the substrate via the holder, stress concentration on the shape memory alloy coil spring can be relieved when the opening / closing plate is opened and closed, and reliability can be improved. It is possible to prevent heater breakage, reduce the number of assembly steps, and provide at low cost.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the damper opening / closing device of the present invention, and FIG. 2 is a perspective view of an essential part of the damper opening / closing device of FIG.
FIG. 3 is an enlarged view of the holder of the damper opening / closing device of FIG. 1,
FIG. 4 is a sectional view of a conventional damper opening / closing device, and FIG. 5 is a front view of a main part of FIG. 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 protrusion, 18
……Lead.

Claims (1)

[Claims] 1. A substrate having an opening, an opening / closing plate rotatably supported by the substrate to open / close the opening, a spring for urging the opening / closing plate in a closing (or opening) direction, and the spring. It consists of a shape memory alloy coil spring that opens and closes the opening and closing plate against
In the shape memory alloy coil spring, a heater is wound around a wire member, and an end of the shape memory alloy coil spring is held by a holder having a flat plate shape and a plurality of holes, and the holder is a heater and a lead wire of the shape memory alloy coil spring. The damper opening / closing device is characterized in that it has a holding portion for holding the connecting portion of the above, and the shape memory alloy coil spring is attached to the opening / closing plate and the substrate via the holder.