JPS59103088A - Valve making use of shape memory alloy - Google Patents

Abstract

PURPOSE:To make a driving part compact, by a method wherein a diaphragm is placed on an opening part of the upper part of a body, whereon a thin plate or coil of a shape memory alloy is made to adhere, which is covered with a case on which a gate for heating and cooling is provided. CONSTITUTION:Normally a diaphragm 3 is floated in a convex shape by force, through which a thin plate 4a which combines a shape memory alloy with rubber is apt to float in the convex shape, and force of a fluid A, a gap (a) is provided between the diaphragm 3 and a protruded part 2 of the inside of a body 1, the fluid A is passed through the gap (a) and flows by turning into a fluid B. When heat of hot water or gas or electricity is made to flow in a cover case 6 and a temperature of the inside of the cover csse 6 is made more than a responsive temperature of the shape memory alloy, the gap (a) is closed by restoring the thin plate 4 to a concave state 4'. When an inflow of the heat into the cover case 6 is suspended and a temperature is lowered, the gap (a) is opened. In addition to the above, the thin plate 4 may be replaced with a coil- like object.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve that attempts to control fluid passing through a pipe body by utilizing the restoring action of a shape memory alloy due to temperature changes in opening and closing the valve.

A valve is connected in the middle of a pipe or at the end of a pipe to control fluid passing through the pipe, and is generally also called a valve.

The valve body includes globe valves, Sanders valves, butterfly valves, etc., but these can be opened and closed manually or by applying full pressure, electricity, etc. from the outside, and this will gradually be automated. We are following the direction of

Therefore, the mechanism becomes complicated, and the device for driving the opening and closing of the valve is larger than the valve body.For example, a diaphragm type or an electric type.

Electromagnetic methods have been developed, and these methods now account for a large portion of the cost.

Therefore, the present invention uses the conventional Sanders valve or the conventional Sanders valve.

A type of valve called a diaphragm valve is characterized by using the shape restoring action of the shape memory alloy due to temperature changes as the thrust for the movement or driving of the diaphragm. This method attempts to control the fluid by opening and closing the gap between the protrusion and the protrusion, and compared to conventional methods, the drive unit is more compact, simpler, more reliable, and lower in cost. It is an attempt to obtain.

The main configuration will be explained below using the embodiment shown in FIG.

What is the shape memory alloy used in this shape memory alloy valve?

It may be in the form of a thin plate or in the form of a coil, and may be one-way or two-way memory. However, in the case of one-way memory, it is combined with elasticity such as a spring.

FIG. 1 is a cross-sectional view of an example of the present invention (a combination of a tire flam and a narrow thin plate-like shape memory alloy;
The figure is a sectional view of an example in which a shape memory alloy is formed into a coil shape.

The body 1 is a tube made of cast iron, bronze, plastic, etc., and has a protrusion 2 of an appropriate height near its inner center.

The upper part of the body is opened approximately centering around the protrusion 2.

A diaphragm 3 with heat insulating properties such as rubber or Teflon is placed to cover it, and as shown in Fig. 4 are fixed in single or several parallel strips.

The shape memory alloy at this time has unidirectional memory (at a temperature higher than a preset temperature, it restores its original shape). However, in this case, elastic materials such as pi are combined using an arbitrary method. For example, a thin plate spring may be used between several parallel alloy strips, or a coil pie or the like may be used vertically between the cover 5 and the diaphragm 3 (described later).
It may be strained and used in combination, etc.), or it may be two-way memory (restores different shapes of chives on the low temperature side and high temperature side set in advance).

And a cover case 5 made of thin steel or plastic.
Cover it with something.

If the 21st
One or more of them are fixed vertically between the tire flam 3 and the cover case 5.

Also in this case, if a shape memory alloy with one-way memory is used, a coil spring or the like is also used.

The cover case 5 is provided with an inlet/outlet 8 through which the cover case interior 6 is heated or cooled by the inflow of electricity or a thermal fluid such as hot water or gas.

The operation of the shape memory alloy valve having the configuration shown in FIG. 1 is as follows.

It is assumed that the fluid flows within the body 1 as fluid B rather than fluid A.

When using shape memory alloys with unidirectional memory.

Normally, the diaphragm 3 is raised in a convex shape as shown by the solid line in FIG. and the protrusion 2 (this means that there is a gap a), and fluid A flows as fluid B through gap a.

Injecting heat such as hot water into the cover case chamber 6 (thereby, if the temperature exceeds the predetermined response temperature of the shape memory alloy 4, the shape memory alloy 4 will memorize in advance). A restoring effect is produced on the shaped alloy 4', that is, the concave shape as shown by the dotted line in FIG.

The gap a between the protrusion 2 is closed.

The flow of fluid A is controlled Q.

As a specific example, if we use a shape memory alloy 4 that is designed to restore response to the shape of the dotted alloy 4' at a temperature of 50°C, and now the cover Assuming that the case chamber 6 is kept at room temperature after being exposed to 20 degrees Celsius, the shape memory alloy will move as shown by the solid line in Fig. 1 due to the elastic force of the spring plate used together and the pressure of the fluid A. Alloy 4 maintains its shape.

The gap a between the tire flam 3 and the protrusion 2 is opened, and the fluid A flows as the fluid B. Heat such as hot water flows into the cover case chamber 6.

When the temperature reaches 50℃ or more, the shape memory alloy 4 responds, and its restoring force overcomes the elastic force of the pie and plate, forming the alloy 4' in the shape of the gate-shaped dotted line in Figure 1. .

The diaphragm 3 is pushed down to 3', the open gap a with the protrusion 2 is closed, and the fluid A is controlled.

If the inflow of hot water or the like stops or its temperature drops, the temperature inside the cover case chamber 6 will also drop, and the restoring force of the shape memory alloy 4' will be lost.

Due to the pressure of the fluid A and the elastic force of the pie and plate, the alloy 4 returns to the shape shown by the solid line, and the gap a is opened.

As shown in FIG.
(Even if the two are fixed, the principle of operation is the same and the operation is the same.

In addition, in the case of a two-way memory alloy, the low temperature side and the high temperature side (
・The shape of each solid line and the shape of the dotted line are convex when the temperature in the cover chamber 6 is low and concave when it is high, and in the case of a coil shape, it is in a contracted state and an expanded state. It is clear that if the shape of the projection 2 is memorized, the gap a between the projection 2 and the projection 2 can be opened and closed in the same way.

In this aspect, the present invention utilizes a shape memory alloy (
This makes the drive unit for opening and closing the valve compact and ensures simple and reliable operation using temperature changes inside the cover case chamber as a command signal.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a valve using a shape memory alloy in the case of a combination of a diaphragm and a narrow plate shape shape memory alloy according to the present invention. Figure 2 is a cross-sectional view of a valve using a shape memory alloy in the case of a combination of a diaphragm and a coiled shape memory alloy. t β also o1 and 乎＠ z']'+YO921!I-Ao rr?* Average M, ;'Se, p
++geff-4 r+Q
Stone 11 Bamboo ``jflI 亨）I 伶 1 Ruled policeman, n Sejin chest and 4 now 01 yo Tsukeki I QkeS 岑 381 day catch 10 nails 1'if IA b-eF3,6at a L+ii
'l' 1 77 gain thousand tons 1% association full use 11]
Up

Claims (1)

[Claims] A diaphragm is placed in the opening at the top of the body with a protrusion in the center of the protrusion, and a thin sheet of shape-memory alloy, or coil-shaped material, is fixed there, and the cover is attached. Cover with a case, cover the case indoors,
A valve utilizing a shape memory alloy, characterized in that a cover case is provided with an inlet/outlet for heating or cooling using electricity, hot water, gas, etc.