JPH0450582A - Switch valve - Google Patents

Abstract

PURPOSE:To simplify component parts so as to reduce the size by fixing a valve body to a valve chamber through a valve body fixing rod for linking the valve body and the valve chamber in such a way that the rolled valve body of a shape memory alloy and the valve are not protruded into the valve chamber, for a switch valve having the valve chamber. CONSTITUTION:For a switch valve main body 1, an entrance 2 for a fluid to be flown in, and an exit 3 for the fluid to be flown out, are indicated, and the switch valve is formed out of a valve chamber 4, a valve chamber entrance 5, a valve port 6, a mounting part 7 of the valve chamber, a stopper 8 of a valve body, a valve body 9, a cap 24 of the valve chamber, and of a valve body fixing rod 41 for fixing to the cap of the valve chamber. The valve body 9 is in a rolled shape, and is made of a thin plate of shape memory alloy, and a martensite transformation is carried out. The valve body 9 is fixed to the cap 24 of the valve chamber 4 through the valve body fixing rod 41 by the valve body fixing rod 41, and is welded on the innermost side of the rolled shape of the valve body 9. As a result, the number of parts is reduced, and the size can be smaller compared with a heat reacting valve.

Description

Detailed Description of the Invention A. Object of the Invention [Field of Industrial Application] The present invention relates to an on-off valve that adjusts the flow rate of fluid in a piping system for hot water supply, and relates to a part that senses temperature as a valve body. , relates to an on-off valve using a shape memory alloy member.

[Conventional technology]

Conventionally, when the temperature of the fluid flowing through the fluid passage deviates from the set temperature, an on-off valve that uses a member made of a shape memory alloy in the opening/closing part that senses the temperature and operates the valve body was developed in 1986. This is already known from publications such as No.-41498. However, the movable parts of conventional on-off valves include a valve body, a movable support member, a fixed support member, a snap ring, a coil made of a shape memory alloy as an on-off element, a bias spring, and the like.

That is, when a conventional on-off valve is shown in FIG. 5, an on-off valve main body 1 has an inlet 2, fluid at the inlet 2 passes through a valve port 12 to form an port 3, and an opening portion of the valve port 12 on the valve chamber 4 side. A valve seat 22 is formed on the
The valve body 18 is placed on the valve chamber 4 side of the valve port 12 so as to sit on the valve seat 22 and close the valve port 12 and open the valve port 12 away from the valve seat 22, and the valve rod 17 is fixed to the valve body 18. Then, the valve body 1 of the valve stem 17
A movable support member 1 is attached to the 8 side portion so as to move together with the valve stem 17.
5 is installed, its outer peripheral portion slides on the inner peripheral wall of the valve chamber 4,
Attach the fixed support member 16 to the outlet 3 side part of the valve chamber 4, fit the outlet 3 side part of the valve stem 17 into the guide hole (not shown) and slide it, and cool it down to a predetermined temperature. A temperature-responsive element 14 made in a coil shape from a shape memory alloy that undergoes thermoelastic martensitic transformation from phase to martensitic phase and undergoes reverse transformation when heated above a predetermined temperature is attached to the valve stem 17.
, with both ends against both support members 15 and 16;
Conventionally, the temperature-responsive element 14 transforms according to the temperature of the fluid in the valve chamber 4 and drives the valve body 18, and when the temperature reaches a predetermined temperature or higher, the valve body 18 seats on the valve seat 22 and closes the valve port 12. It is an on-off valve.

For this reason, a space is required in the valve body to house and slide the valve body, coil, and bias spring, and the mechanism is complicated and has many parts, which poses a problem when miniaturizing the valve body.

[Problem to be solved by the invention]

In order to eliminate these drawbacks, the present invention includes a valve body, a valve stem, a moving support member, a fixed support member, a snap ring, a shape memory alloy coil as an opening/closing element, and
It is an object of the present invention to provide an on-off valve that is miniaturized by simplifying the components by using only a rolled valve body for the bias spring portion.

9. Structure of the Invention [Means for Solving the Problems] In order to solve the above problems, in the present invention, a roll-shaped valve body is formed using a shape memory alloy plate, and a conventional An on-off valve has the function of an on-off valve body and on-off element, and uses deformation due to transformation of the shape memory alloy of this valve body to adjust the flow rate by changing the temperature of the fluid directly from the inlet. The key point is that it uses a memory alloy valve body. As a result, the on-off valve according to the present invention has a very simple structure and does not require space for storing and sliding bias springs, etc., so the mechanism is simpler and has fewer parts than previous on-off valves. It became possible to downsize.

That is, the present invention provides: 1. In an on-off valve having a valve chamber, a rolled valve body made of a shape memory alloy is provided in the valve chamber, and the valve body is arranged in a manner that prevents the valve body from protruding from the valve chamber. An on-off valve characterized in that the valve body is fixed by a valve body fixing rod that is integral with the valve body or connected to the valve body and the valve chamber.

2. In an on-off valve having a valve chamber, a rolled valve body made of a shape memory alloy is provided in the valve chamber, and a stopper for the valve body is provided to prevent the valve body from protruding from the valve chamber. An on-off valve characterized by the provision of an on-off valve.

3. The on-off valve according to claims 1 and 2, characterized in that a thin film is formed at the tip of a rolled valve body made of a shape memory alloy within the valve chamber.

[Effect]

FIG. 1 shows a cross-sectional view of an on-off valve provided with a rolled valve body using the shape memory alloy of the present invention. In Fig. 1(a), fluid enters the on-off valve body l from the fluid inlet 2, and Figs. 2(a) and (b) show that the valve body 9 is prevented from protruding from the valve chamber 4.
, a stopper 8 of the valve body shown in (C) is provided, and the stopper 8 of the valve body shown in FIG.
), the stopper 8 of the valve body is a mesh.

FIGS. 2(b) and 2(c) show a stopper 8 having a lattice-like valve body.

The valve chamber 4 in FIG. 1 has a threaded portion 10 of the valve chamber as shown in FIG. A threaded portion of the valve chamber is attached to and connected to a cap 24 of the valve chamber by a plurality of legs 23, so that fluid flows out to the valve port 6.

The rolled valve body 9 made of a shape memory alloy is attached to the inner wall of the rolled valve body by a thin rod, that is, a valve body fixing rod 41 fixed to the cap 24 of the valve chamber, as shown in FIG. 1(a). Although it is in close contact with the cap 24 of the valve body, it is separated and not bonded, and is only partially fixed by the valve body fixing rod 41. Therefore, the valve body can freely loosen or tighten the thin plate wound into a roll around the valve body fixing rod 41 to increase or decrease the diameter of the roll. The valve body 9 is shaped like a roll as shown in FIG. In this case, the stopper 8 of the valve body is unnecessary, and if the valve body 9 is not fixed to the cap 24 of the valve chamber by the valve body fixing rod 41, the valve body is fixed to the inner wall of the thin plate of FIG.
The valve body 9 may be free in the valve chamber 4 as shown in b), (e), and (d). It is common to fix the valve body with a valve body fixing rod 41, and the valve body 9 shown in FIG. 4(b)
Attach the thin film 11 to the tip of the valve body 9 using a.

The function of this thin film 11 is that it has a cap-like shape attached to the tip of the valve body 9 made of a shape memory alloy with adhesive, as shown in FIG. 4(b). Stopper 8
This is a thin film that prevents the fluid entering from the valve body 9 from flowing backward through the thin film 11 of the valve body 9. It is made of resin, paper, or cloth, and is a thin film that does not allow fluid to pass through and can follow even when the valve body expands and contracts. It can be made of any material.

〔Example〕

The on-off valve of the present invention will be explained based on the drawings. Figure 1 (a
), (b), (C), and (d) are cross-sectional views of the on-off valve of the present invention.

FIG. 1(a) shows an inlet 2 through which fluid flows in, an outlet 3 through which fluid flows out, in an on-off valve body 1, including a valve chamber 4, a valve chamber inlet 5, a valve port 6, and a valve chamber 4, a valve chamber inlet 5, a valve port 6, and The chamber is attached to an opening/closing valve consisting of a part 7, a valve stopper 8, a valve body 9, a valve chamber cap 24, and a valve body fixing rod 41 fixed to the valve chamber cap. The valve body 9 has a roll shape as shown in FIG. 4(a),
It is made of a thin plate of shape memory alloy, and undergoes martensitic transformation from the parent phase in the state of the valve body in FIG. 1(C) to the state in the state of the valve body in FIG. 1(b). In FIG. 1(a), the valve body 9 is fixed to the cap 24 of the valve chamber 4 via the valve body fixing rod 41 only by the valve body fixing rod, and is welded to the innermost side of the rolled valve body. Therefore, the roll of the valve body can freely expand and contract depending on the temperature, allowing martensitic transformation from the parent phase, so that the valve body 9 closes the valve chamber 4 when the parent phase is in the parent phase, as shown in Fig. 1(c). , when the flow of the fluid stops, the temperature of the fluid decreases, and the martensitic transformation is completed, as shown in Figure 1 (
As shown in figure b), fluid passes through the stopper 8 of the valve body, flows from the valve chamber inlet 5 through the valve port 6, and exits from the outlet.

In FIG. 1(b), the valve body 9 may be a roll-shaped valve body without a thin film as shown in FIG. 4(a), and here the valve body 9 of FIG. 4(b) is used. A thin film 11 is adhered to the valve body 9 like a cap to the tip of the valve body 9, and the thin film 11 is attached in close contact with the inside of the valve chamber 4, so that the thin film 11 can follow the expansion and contraction of the valve body. This shows a state in which the phase changes to martensitic transformation and shrinks at the temperature of the fluid, the fluid is lower than the set temperature, and the flow rate of the fluid is large. FIG. 1(c) shows a case where the temperature of the fluid becomes higher than the set temperature, and the flow rate of the fluid becomes zero.

Figures 2 (a), (b), and (C) show a stopper 8 for storing the valve body in the valve chamber and preventing it from coming out from the valve chamber.
is a perspective view showing various stoppers of a valve body stopper 8 for storing the valve body in the valve chamber, and it is sufficient that the valve body 9 does not protrude from the valve chamber 4.

FIG. 3 is a perspective view of the valve chamber 4, that is, the valve chamber 4 is a threaded portion 1 of the valve chamber.
It consists of a valve port 6 which is screwed to the opening/closing valve body by a screw 0 and through which fluid flows, and a leg 23 that connects a cap 24 of the valve chamber. FIG. 4 is a perspective view of the valve body 9. Figure 4 (a
) shows the valve body 9, which has a roll shape, but in the case of the valve body 9 in Fig. 4(a), the cap 2 of the valve chamber
4 is tightly closed to prevent fluid from flowing and fixed with a valve body fixing rod.

In the case of the valve body 9 shown in FIG. 4(b), a thin film 11 is attached to the tip of the valve body 9.
In this case, the valve body fixing rod 41 is attached to the cap of the valve chamber as shown in FIGS. 1(a), (b), (c), and (d). Although it is not necessary to fix the valve body with the valve body fixing frame 41, from the viewpoint of stability, it is better to fix the valve body with the valve body fixing frame 41. The thin film 11 is made of a resin-based film such as vinyl or paper (
(coated with oil) etc.

A valve body made of a shape memory alloy has a rolled shape with a reduced outer diameter when the temperature of the fluid flowing through the valve chamber is lower than the set temperature, and a rolled shape when the temperature of the fluid is higher than the set temperature. Metallic phase transformation treatment is applied so that the outer diameter is enlarged. As a result, as shown in FIG. 1(c), the valve body 9 is in the state of a matrix of shape memory alloy,
The valve body 9 is in close contact with the inside of the valve chamber, and the flow of fluid is stopped when fluid having a predetermined high temperature flows.

As shown in FIG. 1(b), when the valve body is in a contracted state, the temperature of the fluid decreases, and the shape memory alloy valve body undergoes martensitic transformation, causing the outer part of the valve port 6 and valve body 9 to be transformed into martensitic material. Due to the wide distance between the diameter and the diameter, the flow rate of the fluid passing through it is maximized. On the other hand, when the valve body is between a predetermined high temperature and a predetermined low temperature, the transformation proceeds in the middle of the hysteresis, so that the outer part of the valve port 6 and the valve body 9 is The flow rate becomes small because the distance from the diameter becomes narrow to about the middle between FIG. 1(c) and FIG. 1(b). The alloy used for the valve body of the on-off valve of the present invention is a shape memory alloy, as shown in Fig. 1(b), (c), and (d), so that when the temperature of the fluid passing through it becomes lower than the set temperature. It returns to its contracted state by itself, and the flow rate of the fluid passing through it increases again. For this reason, a bias spring is not required, and the valve body and opening/closing element are made of the same part, resulting in a very simple structure and a reduction in the number of parts. This makes it possible to make the valve smaller than conventional on-off valves.

C1 Effects of the invention [Effects of the invention] By using a shape memory alloy and making the valve body and thermally responsive element of the on-off valve into the same part, parts such as bias springs and sliding parts are unnecessary, and the structure of the valve is improved. Because it has become much simpler, the number of parts has been reduced, making it possible to make it smaller than conventional thermally responsive valves.

[Brief explanation of the drawing]

FIG. 1(a) is a sectional view of an on-off valve according to an embodiment of the present invention, in which a valve body is fixed to a cap of a valve chamber by a valve body fixing rod. FIGS. 1(b), (c), and (d) are cross-sectional views of embodiments of the present invention. In the drawings, FIG. 1(b) is a sectional view of the on-off valve of the present invention when the flow rate is large, and FIG. 1(c) is a cross-sectional view of the on-off valve of the present invention when the flow rate is stopped. FIG. FIG. 1(d) is a sectional view of the on-off valve of the present invention when the flow rate becomes easy between that of FIG. 1(b) and FIG. 1(c). FIGS. 2(a), 2(b), and 2(c) are perspective views of a stopper for the valve body for storing the valve body in the valve chamber and preventing the valve body from protruding from the valve chamber. FIG. 3 is a perspective view of the valve chamber. FIGS. 4(a) and 4(b) are perspective views of a rolled valve body of the present invention. FIG. 5 is a sectional view of a conventional temperature-responsive valve. 1... Open-close valve body, 2... Population, 3... Outlet,
4...Valve chamber, 5...Valve chamber inlet, 6.12...Valve port, 7...Valve chamber is installed partially, 8...(Store the valve body in the valve chamber) ) Valve body stopper, 9, 18...
・Valve body, 10...Threaded part of valve chamber, 11...Thin film, 1
3... Valve seat member, 14... Temperature responsive element, 15...
- Moving support member, 16... Fixed support member, 17...
Valve stem, 19, 20...snap, ring, 21...
Gasket, 22... Valve seat, 23... Leg, 24...
・Valve chamber cap, 41...valve body fixing rod.

Claims (1)

[Scope of Claims] 1. In an on-off valve having a valve chamber, a rolled valve body made of a shape memory alloy is provided in the valve chamber, and a valve body is provided in the valve chamber to prevent the valve body from protruding from the valve chamber. An on-off valve characterized in that the valve body is fixed to the valve chamber by a valve body fixing rod that is integral with the valve body and the valve chamber or connected to the valve body and the valve chamber. 2. In an on-off valve having a valve chamber, a rolled valve body made of a shape memory alloy is provided in the valve chamber, and a stopper for the valve body is provided to prevent the valve body from protruding from the valve chamber. An on-off valve characterized by the provision of an on-off valve. 3. The on-off valve according to claims 1 and 2, characterized in that a thin film is formed at the tip of a rolled valve body made of a shape memory alloy within the valve chamber.