JPH0747996B2 - Temperature responsive valve - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controllable fluid that is heated and cooled to change the valve opening degree according to the temperature thereof, and particularly uses a fibrous shape memory alloy as a temperature responsive member. The present invention relates to a temperature responsive valve that controls the valve opening.

Discharge fluid above or below a certain temperature to the outside of the system,
The temperature responsive valve is used when a plurality of fluids are mixed into a fluid having a predetermined temperature.

2. Description of the Related Art Conventionally, some valves of this type use a bimetal or a shape memory alloy as a temperature responsive member. That is, a disc-shaped, strip-shaped or coil-shaped bimetal or shape memory alloy and a valve member are integrally combined, and the bimetal or shape memory alloy is deformed by the temperature of the passing fluid to open or close the valve portion or the valve portion. It also controls the opening degree of.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above-mentioned conventional temperature-responsive valve, the one using a bimetal is very large for operating a large valve member or a valve member under high pressure because the deformation force of the bimetal is small. However, in the case of using a shape memory alloy, the deformation of the shape memory alloy is a deformation within a very narrow temperature range centered on its transformation temperature, so However, the deformation is not proportional to the temperature, and there is a problem that it is not suitable for a valve mechanism that sequentially changes the valve opening degree according to the temperature change.

Therefore, the technical problem of the present invention is to obtain a temperature responsive valve that changes the valve opening degree according to the fluid temperature by using a shape memory alloy that generates a large deformation force.

MEANS FOR SOLVING THE PROBLEM The technical means of the present invention taken to solve the above-mentioned technical problem forms an inlet, a valve chamber and an outlet in a valve casing,
A plurality of fibrous shape memory alloys having different transformation temperatures are arranged in a mixed wire winding in the valve chamber, and the fibrous shape memory alloy is sequentially transformed according to the temperature of the fluid in the valve chamber. Is designed to change.

Action The action of the above technical means is as follows.

By arranging the fibrous shape memory alloy in the mixed wire winding form and arranging it in the valve chamber, the controlled fluid flowing from the inlet passes between these mixed wire winding-shaped wires and reaches the outlet. Since the winding mixed wire is formed of a plurality of fibrous shape memory alloys having different transformation temperatures, the plurality of shape memory alloys are sequentially transformed according to the fluid temperature, and the distance between the wires changes. The change in the wire-to-wire distance between the winding mixed wires is equal to the change in the valve opening, and the flow rate of the controlled fluid from the inlet to the outlet is controlled.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to obtain the temperature responsive valve capable of controlling the passing flow rate according to the fluid temperature by using the shape memory alloy capable of generating a large deformation force. .

Further, according to the present invention, the fibrous shape memory alloy doubles as a valve and a valve seat, and also functions as a filter for capturing foreign matter contained in the fluid, thereby simplifying the structure as a valve. In addition to being able to do so, the shape can be made smaller.

Example An example showing a specific example of the above technical means will be described (see FIGS. 1 and 2).

Cap nut 3 using inlet member 1 and outlet member 2 as fastening members
Are fastened together to form a valve casing. Female thread portions 4 and 5 for pipe connection are provided at the ends of the inlet member 1 and the outlet member 2, respectively. A substantially cylindrical valve chamber 6 is formed in the valve casing between the female screw parts 4 and 5, and a plurality of fibrous shape memory alloys 11 having different transformation temperatures are arranged in a mixed wire winding inside. That is, a plurality of fibrous shape memory alloys having transformation temperatures of 50 ° C., 60 ° C., 70 ° C., 80 ° C., etc. are mixed to form a mixed wire winding and have the same shape as the cylindrical space of the valve chamber 6 to be arranged. The shape memory member (not shown) having the shape is used to store the shape and then the shape memory member is arranged. Mesh plates 12 and 13 for preventing the shape memory alloy 11 from coming out are attached to both ends of the valve chamber 6 on the inlet and outlet sides.

There are two types of deformation of shape memory alloy, one is unidirectional and the other is two.
Although there is a directional type, a unidirectional type can be used almost in the same way as a bidirectional type by using a bias spring (not shown). In this embodiment, an example using a bidirectional shape memory alloy is shown.

Reference numeral 20 is a gasket for keeping the connection between the inlet member 1 and the outlet member 2 airtight.

Next, the operation will be described.

When the temperature of the fluid flowing from the inlet portion 4 is 50 ° C. or lower, all of the plurality of shape memory alloys 11 have the shapes before the transformation, the gaps of the mixed wire winding are large, and the passing area is large (FIG. 1). State). Therefore, a large amount of low-temperature fluid below 50 ° C is discharged. Fluid temperature from 50 ℃ to 60 ℃, 70 ℃, 80
When the temperature rises to ℃, all of the shape memory alloys 11 are transformed and the mixed wire winding-shaped gap becomes small and the passage area becomes small (state shown in FIG. 2), and almost no fluid passes through the outlet portion 5. It becomes a state.

In this example, the transformation temperature of the shape memory alloy 11 was 50 ° C.
The transformation temperature can be adjusted to almost any value by changing the material composition of the shape memory alloy, depending on the operating conditions. It can be appropriately selected.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a temperature responsive valve of the present invention, and FIG. 2 is a partial sectional view of an essential part showing a deformed state of the temperature responsive member in FIG. 1: Inlet member, 2: Outlet member 6: Valve chamber, 11: Shape memory alloy 12, 13: Mesh plate

Claims (1)

[Claims] 1. A valve casing is used to form an inlet, a valve chamber and an outlet, and a plurality of fibrous shape memory alloys having different transformation temperatures are arranged in a mixed wire winding in the valve chamber, depending on the temperature of the fluid in the valve chamber. A temperature-responsive valve in which the fibrous shape memory alloy is sequentially transformed to change the wire-to-wire distance between the winding mixed wires.