JPH02211324A - Thermostat - Google Patents

Abstract

PURPOSE:To get rid of leak from between the portions a wire by conducting the winding in a spiral shape of a shape memorizing alloy wire rod covered with an elastic material such as rubber or the like, at a surface, and forming a thermostat so that spaces between the portions of the wire may be isolated at the time of a high temperature, and conducting a close adhesion by means of the elastic material at the time of a low temperature. CONSTITUTION:A thermostat 10 is made up of a spiral body 12 which is formed by winding in a cylindrical shape a wire rod 14 that is a shape memorizing alloy core rod 16 whose surface is covered with a rubber elastic body 18. The spiral body 12 is so qualified that the portions of the wire rod adhere closely to each other at the time of a low temperature and they are isolated from each other at the time of a high temperature. A flange 20 is fitted at one end of the spiral body 12, and a seal plate 22 is fitted to the other end. When fitting is made so that the flange 20 may partition a flow passage, a closing condition is brought about at the time of the low temperature as the portions of the wire rod 14 are made to adhere each other by means of the elastic material. Leak is more perfectly prevented by especially providing a spring and conducting pressing. Also, to deteriorate the core material by a large stress does not occur if the processing of an elastic body cover is conducted by isolating spaces between the portions of the wire rod at the time of the high temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a cooling water flow flowing through a radiator of a water-cooled engine! 11. It relates to thermostats used for adjustment, etc.

BACKGROUND ART AND PRIOR ART PROBLEM TO BE SOLVED BY THE INVENTION Conventionally, this type of thermostat is of a poppet type, but in order to have a simpler structure, the present invention uses a wire rod made of a shape memory alloy wound to form a spiral body. The aim is to realize a thermostat that opens and closes by changing the spacing between the wires.

This spiral body is 111. , S thermostats are shown in, for example, Japanese Patent Application Laid-Open No. 59-54'788, but if wires made of shape memory alloy are simply used, leakage may occur between the wires when the wires are brought into close contact with each other and closed. , the disadvantage is that it cannot be completely closed.

The present invention eliminates this drawback while using a spiral body,
The objective is to obtain a thermostat that can be completely closed without leakage.

Means for Solving the Problems The present invention involves winding shape memory alloy wire rods to form a helical body, deforming this helical state by temperature to change the spacing between the wire rods, and reducing the rit of fluid passing between the wire rods. In a thermostat that changes the temperature, the wire rod is formed by covering the surface of a core material made of a shape memory alloy with an elastic body such as rubber, and the spiral body is characterized so that the wire rods are separated at high temperatures. This is a thermostat that features:

This thermostat may include a spring that deforms the spiral body so that the wire is in close contact with the U when the temperature is low.

Function: In this thermostat, since the wire is covered with an elastic body, it is possible to prevent leakage at the 11 o'clock position.In particular, if a spring is provided, leakage can be better prevented.

Furthermore, in order to cover an elastic material such as rubber, the wire rods are spaced apart and the elastic material is applied to the surface, usually at least 100%
It is necessary to heat the metal to a high temperature of around 30°F, and when large stress is generated at high temperatures, shape memory alloys deteriorate and become less durable, but in this spiral structure, the wires become separated at high temperatures. Because of these properties, even when coating an elastic body at high temperatures, the coating process can be performed without generating large stress, and no deterioration occurs.

EXAMPLES Below, examples illustrating the present invention will be specifically described.

1 and 2 show a thermostat 10 of a first embodiment.

In this thermostat 10, the spiral body 12 is formed by winding a wire 14 into a cylindrical shape.

This wire rod 14 is formed by covering the surface of a core material 16 made of a shape memory alloy with an elastic body 18 made of rubber. The spiral body 12 is
The wires are shaped so that they are in close contact with each other when the temperature is low, and the wires are separated from each other when the temperature is high. A flange 20 is attached to one end of this spiral body 12, and a seal plate 22 is attached to the other end.

Since this thermostat 10 has the following configuration,
The flanges 20 are used to partition the flow path (not shown).At low temperatures, the wire rods 14 are in close contact with each other, as shown in FIG. 1, and in a closed state, and at high temperatures, as shown in FIG. As shown, gaps are created between the wires 14 through which fluid can flow.

FIG. 3 shows a thermostat 30 of a second embodiment.

In this thermostat 30, the spiral body 32 is formed by winding a wire 34 into a conical shape.

This wire rod 34 is formed by covering a core material 36 made of a shape memory alloy with an elastic body 38, similar to the wire rod 14 in the above example.

The spiral body 32 has a shallow conical shape when the temperature is low, and the wires are in close contact with each other, and a deep conical shape when the temperature is high, so that the wires are separated from each other. The center of this spiral body 32 is sealed with an elastic material to prevent leakage, and the periphery is attached to a flange 40.

In this thermostat 30, when the temperature is low, the wire rods 34 are in close contact with each other, as shown by the solid line in the figure, and the thermostat 30 is in a closed state, and when the temperature is high, the space between the wire rods 34 is expanded, as shown by the phantom line, allowing fluid to flow.

FIG. 4 shows a thermostat 50 according to a third embodiment.

This thermostat 50 is similar to the thermostat 3 in the above example.
0, the spiral body 52 has a planar shape when the temperature is low and a conical shape when the temperature is high.

5 and 6 show a thermostat 70 according to a fourth embodiment.

In this thermostat 70, the spiral body 72 is formed by winding a wire 74 into a cylindrical shape.

This wire rod 74, like the wire rod 14, is formed by covering a core material 76 made of a shape memory alloy with an elastic body 78. The spiral body 72 is such that the wires separate from each other when the temperature increases. Note that this spiral body 72, like those on each side, has the property of deforming so that the wire sticks tightly at low temperatures, or does not generate deforming force when the temperature becomes low. A plate-shaped flange 82 having a hole 80 is attached to one end of this spiral body 72, and a seal plate 84 is attached to the other end. A bottle 86 is provided, and a spring 88 is provided between the bottle 86 and the seal plate 84 to push the seal plate 84 toward the flange 82.

Since this thermostat has the following configuration, when the temperature is low, the elastic force of the spring 88 causes the
The wire rods are brought into close contact with each other and the mine is completely closed.

state. At this time, when the spiral body 72 generates a deforming force at a low temperature, it goes without saying that the deforming force also acts. At high temperatures, the spiral body 72 deforms against the spring 88, as shown in FIG. 6, creating gaps between the wires to allow fluid to pass through.

Effects of the Invention As mentioned above, the thermostat of the present invention forms a spiral body using a wire whose surface is coated with an elastic material, so that when the thermostat is closed, the wires are in close contact with each other without any gaps and no leakage occurs. Become. In particular, if a spring is provided so that the wires are pressed against each other, leakage can be more completely prevented.

Furthermore, in this thermostat, the wires are spaced apart when the spiral body is at high temperature, so even if the wires are spaced apart and heated when the elastic body is coated, the shape memory of the wire is maintained. Since it does not cause large stress on the alloy,
It does not cause deterioration and shorten the lifespan.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view u'ii of the first embodiment of the present invention at low temperature, FIG. 2 is a front sectional view of the same side at high temperature, and FIG. 3 is a front sectional view of the second embodiment. Figure 4 shows 11: of the third embodiment. A cross-sectional view, FIG. 5 is a front cross-sectional view of the fourth embodiment at low temperature, and FIG.
The figure is a front sectional view of the same side at high temperature. 10. 30, 50, 70... thermostat, 12.
32,52.72...Spiral body, 14,34°74.
... Wire rod, 16, 36, 76 ... Core material, 18, 38.
78...Elastic body, 88...Spring.

Claims (1)

[Claims] 1. Shape memory alloy wire rods are wound to form a spiral body, and this spiral state is deformed by temperature to change the spacing between the wire rods and change the amount of fluid passing between the wire rods. The thermostat is characterized in that the wire rods are formed by covering the surface of a core material made of a shape memory alloy with an elastic body such as rubber, and the spiral body is characterized in that the wire rods are separated from each other at high temperatures. thermostat. 2. The thermostat according to claim 1, further comprising a spring that deforms the spiral body so that the wires come into close contact with each other at low temperatures.