JPH0495683A - Temperature reactive valve - Google Patents

Abstract

PURPOSE:To control the flow rate of controlled fluid from an inlet to an outlet by arranging fiber shape memorizing alloys different in transformation temperature in cross winding form in a valve so that the fiber shape memorizing alloys can be transformed in response to fluid temperature and a distance between windings can be varied. CONSTITUTION:An inlet member 1 and an outlet member 2 are fastened with a cap nut 3 to form a valve casing. The inlet member 1 and the outlet member 2 are provided with female screw portions 4, 5 for pipe connection. A nearly cylindrical valve chest 6 is formed in the valve casing between the female screw portions 4, 5, inside which fiber shape memorizing alloys 11 different in transformation temperature are arranged in a cross winding form. If the temperature of fluid flowing from an inlet 4 is 50 deg.C or lower, e.g. the shape memorizing alloys 11 has greater cross-winding gaps and larger passing areas in shape before transformed. As the temperature rises the shape memorizing alloys 11 are all transformed to reduce in cross-winding gaps and in passing areas, resulting in the condition that fluid is practically not passed. It is thus possible to control a passing flow rate in response to a fluid temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a device that is heated and cooled with a fluid to be controlled and changes the degree of valve opening according to its temperature, and in particular uses a fibrous shape memory alloy as a temperature responsive member. The present invention relates to a temperature-responsive valve that controls the opening degree of the valve.

Fluid with a temperature above or below a specified temperature is discharged from the system,
Temperature-responsive valves are used when a plurality of fluids are mixed to produce a fluid at 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. In other words, a disc-shaped, strip-shaped, or coil-shaped bimetal or shape memory alloy is combined into a valve member, and the bimetal or shape memory alloy is deformed by the temperature of the passing fluid, opening or closing the valve part, or causing the valve part to open or close. It controls the opening degree.

Problems to be Solved by the Present Invention In the conventional temperature-responsive valves mentioned above, those using bimetals have a small deformation force, so it is difficult to operate large valve members or valve members under high pressure. Additionally, shape memory alloys deform within a very narrow temperature range centered around their transformation temperature, so they cannot be used like bimetals. However, the deformation does not occur in proportion to temperature, and there is a problem in that it is not suitable for a valve mechanism that sequentially changes the valve opening degree in response to temperature changes.

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

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems is to form an inlet, a valve chamber, and an outlet with a valve casing,
A plurality of fibrous shape memory alloys having different transformation temperatures are arranged in a cross-wound shape in the valve chamber, and the S male shape memory alloys are sequentially transformed according to the temperature of the fluid in the valve chamber, forming a cross-wound wire. The distance between them is changed.

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

By arranging the male shape memory alloy in a cross-wound shape within the valve chamber, the fluid to be controlled flowing in from the inlet passes between the wires of the cross-wound shape and reaches the outlet. Since the wound cross wire is formed of a plurality of fibrous shape memory alloys having different transformation temperatures, the plurality of shape memory alloys are sequentially transformed depending on the fluid temperature, and the distance between the wires changes. A change in the distance between the coiled cross-wires is equivalent to a 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 a temperature-responsive valve that can control the passage flow rate according to the fluid temperature by using a shape memory alloy that can generate a large deformation force. .

Further, according to the present invention, the structure of the valve can be simplified by using the Ili miscellaneous shape memory alloy to function as a valve seat and also to function as a filter to capture foreign matter contained in the fluid. It is possible to make the shape smaller.

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

A cap nut 3 that uses the inlet member 1 and the outlet member 2 as fastening members
to form the valve casing. The ends of the inlet member 1 and the outlet member 2 are provided with internal threads 4 and 5 for piping connection, respectively.
establish. A substantially cylindrical valve chamber 6 is formed within the valve casing between the female threaded portions 4 and 5, and a plurality of fibrous shape memory alloys 11 having different transformation temperatures are arranged therein in a cross-wound configuration. That is, a plurality of m-male shape memory alloys having transformation temperatures of 50° C., 60° C., 70° C., 80° C., etc. are mixed and made into a cross-wound shape.
In order to arrange the valve chamber 6, the shape is memorized using a shape memory member (not shown) having the same shape as the cylindrical space of the valve chamber 6, and then the valve chamber 6 is arranged. Mesh plates 12 and 13 are attached to both ends of the valve chamber 6 on the entrance and exit sides to prevent the shape memory alloy 11 from being pulled out.

There are two types of deformation of shape memory alloys: one-directional and two-directional.
There are directional ones, but unidirectional ones are bias springs (
(not shown), it can be used almost in the same way as a bidirectional one.

In this example, an example using a bidirectional shape memory alloy is shown.

Reference number @20 is a gasket that maintains the connection between the inlet member 1 and the outlet member 2 airtight.

Next, the effect will be explained.

When the temperature of the fluid flowing in from the inlet portion 4 is 50° C. or lower, all of the plurality of shape memory alloys 11 are in the shape before transformation, and the gap in the cross-winding shape is large and the passing area is also large (Fig. 1). ). Therefore, the low-temperature fluid below 50° C. is discharged into the large outlet.

When the fluid temperature rises from 50°C to 60°C, 70°C, and 80°C, all of the shape memory alloys 11 undergo transformation, and the gaps in the mixed windings become smaller and the passing area becomes smaller (second
(state shown in the figure), almost no fluid passes through the outlet section 5.

In this example, the transformation temperature of the shape memory alloy 11 is set to 5
Although the transformation temperature is shown as 0°C to 80°C, the transformation temperature can be adjusted almost arbitrarily by changing the material composition of the shape memory alloy, and can range from minus several tens of degrees Celsius to plus 150°C depending on the usage conditions. It can be selected as appropriate.

[Brief explanation of drawings]

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

Claims (1)

[Claims] 1. An inlet, a valve chamber, and an outlet are formed in the valve casing, and a plurality of fibrous shape memory alloys with different transformation temperatures are arranged in a mixed coil shape in the valve chamber, and the fibrous shape memory alloys A temperature-responsive valve in which the shape-memory alloy undergoes sequential transformation and the distance between the wound wires changes.