JPS5857573A - Thermo sensitive valve - Google Patents

Abstract

PURPOSE:To enable to sense to the temperature of water and to automatically open and close the flow of water by a method wherein the martensite transformation point of a spring, which is one of two springs installed within the valve and acts for parting a valve from a valve seat, and the Curie point of a thermosensitive magnetic material are rendered to be nearly equal to each other. CONSTITUTION:A thermo sensitive device consisting of the tension spring 5, which is made by forming a memory alloy in corrugated shape, and a compression spring 6 made of ordinal spring material is provided within a casing 1. When water with elevated temperature comes in the casing 1 from an intake 12 and the temperature of the valve 4 made of thermo sensitive magnetic material exceeds its Curie point, the valve 4, which is firmly attracted by a permanent magnet 2, is shifted by being pushed by the pressure of the water, because of the disappearance of the attractive force of the valve 4. Consequently, the water flows into the valve and causes to heat the spring 5 of the thermo sensitive device, resulting in transforming the memory alloy from its martensite state to its mother phase and abruptly contracting the device and consequently abruptly discharging the water through the valve from efflux holes 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature-sensitive pulp that automatically opens and closes fluid passages in response to the temperature of the fluid.

Traditionally, pulp has been used as a means to stop the flow of water and open holes. In addition, electromagnetic pulp is usually used in order to increase the deviation especially in the opening and closing parts. However, since electromagnetic pulp uses the magnetic force created by electricity to drive the pulp, it requires electrical wiring when used, and if it is installed directly in water, the electrical circuit and wiring parts are waterproof. However, there are problems in that it is complicated and the equipment is expensive. On the other hand, if a means such as electromagnetic pulp is not used, there is a method of constructing the structure using bimetal, but bimetal has the disadvantage that the deviation due to temperature is small and the paternal side is also small, so the desired performance cannot be obtained. there were.

The object of the present invention is to develop a completely new temperature-sensitive pulp that has a simple structure and operates reliably, which responds to the temperature of water and automatically opens and closes the flow of water without requiring energy from electricity or other sources in water. Our goal is to provide the following.

Shape memory alloys are materials that can produce large deviations due to temperature changes. Shape memory alloy.

It is a material that has the unique property of forming a shape in a high-temperature matrix, deforming in the martensitic transformation temperature range of 150°C or less, and returning to its original shape when the temperature of the matrix is returned again. Also, for the same amount of strain, the tensile strength of the material in the martensitic transformation state is almost equal to that in the matrix state! By combining this with a normal spring, it is possible to construct a temperature-sensing device that can automatically fully deflect the valve as the temperature rises or falls. Shape memory properties are Ni49-51%
Ti-Ni alloy, or Cu-Al-Ni alloy, Cu-
This is a unique characteristic that appears in Zn-Al alloys, etc., but its origin has not been fully elucidated, and it is known from the literature that it is possible to combine a shape memory alloy with a normal spring to construct a device that operates according to temperature changes. However, the details of the method and means are not currently clear.

Examples will be described below with reference to the drawings.

FIG. 1 is an external view of an embodiment of a temperature-sensitive valve according to the present invention. The threaded portion on the right side is connected to another mechanism so that fluid such as water flowing in through the valve from the right end inlet flows out through the outflow hole 11 on the circumferential surface of the housing 1. The fluid flow may be in the opposite direction. The internal structure of this thermosensitive pulp is shown in FIGS. 2 and 3.

First, in FIG. 2, the housings 1, . . . , 2 of the temperature-sensitive valve are provided with screws on the outer circumferential surface of the portion that will become the water intake port 12 for attachment to other structures.

The housing 1 is made of aluminum alloy or aluminum-zinc alloy.

Alternatively, a resin ring or a non-magnetic material is preferable. A permanent magnet 2, which serves as a valve seat, is installed and fixed near the intake port 12 of the housing 1. The permanent magnet 2 may be a rubber magnet, a barium ferrite magnet, an alnico magnet, or a rare earth magnet, and is magnetized so that the direction of the magnetic pole is in the in-plane direction or an in-plane VcN-8 pole is generated. The center of the permanent magnet 2 is hollow so that water can pass through it.

Inside the body 1, there is further a valve 4 made of a temperature-sensitive magnetic material.
is movable in the axial direction.

When the valve 4 is below one Curie point, it is attracted to the permanent magnet 2 as shown in Fig. 2, and its surfaces come into close contact with each other to stop the flow of fluid, but when it is separated from the permanent magnet 2 as shown in Fig. 3. The outflow hole 11 is connected to the inlet 121' (to allow fluid to pass therethrough).

In order to improve the close contact between the surfaces of the permanent magnet 2 and the valve 4, a ring-shaped backing 5 made of rubber, cloth, resin, etc. is adhered to the surface of the magnet 2. The temperature-sensitive magnetic material constituting the valve 4 is selected so that its magnetic transformation point (curi point) approximately coincides with the opening/closing set temperature of the entire temperature-sensitive pulp.

Temperature-sensitive magnetic materials include metal oxide ferrite temperature-sensitive magnetic materials and Fe-Ni-Cr-based metal temperature-sensitive magnetic materials, but metal temperature-sensitive magnetic materials are preferred here.

Further, inside the housing 1, a temperature sensing element is provided which contracts and expands in response to temperature. The temperature sensing element is composed of five tension springs 5 made by shaping shape memory alloy strips into a corrugated shape and three compression springs 6 made of nine ordinary spring materials.

As is clear from the springs 5 and 6 in FIG. 2(b), the shape memory alloy springs 5 and the normal springs 6 are alternately and symmetrically arranged adjacent to each other. Here, the strength of the shape memory alloy spring 5 is e TM.

Assuming that the strength of the normal spring 6 is TN, when the temperature is high and the shape memory alloy is in the matrix state, the temperature sensing element contracts,
The state is shown in FIG. 6, and the relationship is TM>TN.

Next, the temperature drops and the shape memory alloy enters the martensitic transformation region.

Shape memory alloy spring 5 has low tensile strength 9 Normal spring 6
The force of 2 prevails, and the temperature sensing element usually expands due to the spring pressure of spring 2. In this case, the force of each spring is FiTM<TN.

In this way, as the temperature rises and falls, the forces of the shape memory alloy spring 5 and the normal spring B become opposite to each other. Even in that case, the shape memory alloy springs 5 and 9 are placed in symmetrical positions with respect to the regular spring 6 so that an average force as a temperature sensing element can be obtained by the shape memory alloy spring 5 and the regular spring 6. Must be placed alternately. Therefore, in order to constitute one temperature sensing element, at least two or more combinations of the shape memory alloy spring 5 and the normal spring A are required.

Next, the operation of this temperature-sensitive valve will be explained. In FIG. 2, it is assumed that the temperature-sensitive valve is in a low temperature state. Now, water whose temperature has risen is coming in from the intake port 12, and the valve 4 has exceeded one point.

The valve 4 made of a temperature-sensitive magnetic material, which had been strongly attracted by the permanent magnet 2, loses its attractive force and is moved by the water pressure. Then, the heated water flows into the valve and warms the spring 5 of the temperature sensing element, so the shape memory alloy changes from the martensitic state to the matrix, and the temperature sensing element rapidly changes as shown in Figure 3. The water passes through the entire pulp and flows through the outflow hole 1.
It starts to flow rapidly from 1. Next, when the temperature of the flowing water drops, the shape memory alloy spring 5 of the temperature sensing element enters the martensite state, so TN>TM, and the force of the spring 6 normally overcomes the temperature sensing element, causing it to expand. On the other hand, since the temperature-sensitive magnetic material constituting the valve 4 has a temperature of less than one Curie point, it generates magnetism, and when the temperature-sensitive element approaches the permanent magnet 2 due to extension,
A magnetic path is formed between it and the permanent magnet 2.

It is suddenly attracted to the magnetic surface and blocks the flow of water.

Note that a temperature-sensitive magnetic material may be used in place of the permanent magnet 2 forming the valve seat, and the valve 4 may be formed of a permanent magnet material.

It goes without saying that the number of springs 5 and 6 can be changed.

As described above, according to the temperature-sensitive valve of the present invention.

No external power is required to drive the valve.

The amount of valve deviation is large, and a large valve closing force can be obtained, so operation is reliable, and the structure is simple and can be provided at low cost.
Industrially useful.

[Brief explanation of the drawing]

FIG. 1 is an external view of an embodiment of the temperature-sensitive pulp according to the present invention;
FIG. 2(a) Longitudinal cross-sectional view of the same example at low temperature, 2nd
Figure (b) i'' is also a left side view, and Figure 3 is a longitudinal cross-sectional view of the same example at high temperature. 1... Housing body, 2... Permanent magnet, 3... Backing. 4 ... Valve, 5... Shape memory alloy spring, 6... Ordinary nokune. Fig. 1

Claims (1)

[Claims] 1. A housing that constitutes a fluid passage, a valve seat provided in the housing, a movable valve facing the valve seat, and a shape memory alloy that is made of a multi/site transformation. a first spring adapted to pull the valve away from the valve seat at temperatures above the temperature;
a second spring made of ordinary spring material and incorporated to move the valve closer to the valve seat at temperatures below the martensitic transformation point of the second spring; A permanent magnet is used for one of the springs, and a temperature-sensitive magnetic material is used for the other, and the martensitic transformation point of the first spring is selected and configured so that the Curie point of the temperature-sensitive magnetic material is almost the same. Temperature-sensitive pulp featuring Below margin