JPS61218879A - Closing valve - Google Patents

Abstract

PURPOSE:To produce a closing valve which is suitable for high pressure fluid and movement caused by change in the strain of an electrical strain member by providing a pressure equilibrium section between inlet and outlet paths for high pressure fluid, and a valve to connect the above paths and cut off their connection by its sitting at a valve seat and leaving there respectively. CONSTITUTION:Positive and negative voltages are applied to each of thin plates 18A, 19A, 18B, 19B of electrical strain members 16A, 16B and metal plates 20A, 20B respectively from a direct current voltage source 24 by operating a change-over switch 25. The electrical strain members 16A, 16B moves downward in axial direction to separate a valve 12 from a valve seat 5, and an inlet path 2 is therefore connected with an outlet path 3. When the application of the voltage to the electrical strain members 16A, 16B is stopped, the contracted thin plates 18A, 18B and elongated ones 19A, 19B recover their original dimensions respectively to return the electrical strain members 16A, 16B to their original positions. A valve body 11 returns therefore to its original position to cut off connection between the inlet path 2 and outlet one 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an on-off valve that moves a valve body by strain displacement of an electrostrictive member to shut off communication between fluid inflow and outflow channels.

[Conventional technology]

This type of on-off valve is disclosed in Japanese Patent Laid-Open No. 57-29871. This on-off valve is provided with a valve body that is attached to and separates from the valve seat between the inflow and outflow passages to cut off communication between the inflow and outflow passages,
The valve body is actuated by an electrostrictive member.

[Problem that the invention seeks to solve]

However, the valve body is not in pressure equilibrium with the fluid pressure in the inlet and outlet channels, and the valve body moves against the acting force caused by this fluid pressure, so it is difficult to open and close extremely low-pressure fluid. It is only suitable for In addition, in order to balance the pressure of the fluid in the inflow and outflow channels, if a spool-shaped valve body is used that has a land on the opening/closing part, it will be necessary to move the valve body over a long distance, resulting in strain displacement of the electrostrictive member. There was a problem that it became unsuitable for transportation.

[Means for solving problems]

The present invention has been made in view of the above circumstances, and includes a valve seat formed in a valve hole in which a fluid inlet and an outlet are communicated with each other with a gap in the axial direction, and the valve seat is attached and separated from the valve seat. A valve body having a valve part that blocks communication between the inflow and outflow passages is provided in the valve hole so as to be freely movable in the axial direction. A balancing part is provided so that the pressure is approximately balanced against the pressure, and a plate-shaped electrostrictive member that causes strain displacement when a voltage is applied is simultaneously strained and displaced in the same direction outward of each balancing part of the valve body. It is configured to be electrically connected so that it can move in the axial direction.

[For production]

In the shut-off valve of the present invention configured as described above, the valve body is attached to and separated from the valve seat portion in a state where the pressure is substantially balanced with the fluid pressures of the inflow and outflow channels, and communication between the inflow and outflow channels is interrupted. It will be done. Further, the valve body is well supported and moved by the electrostrictive members on both sides or the balance parts on both sides.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, 10 indicates a valve body, and clamping members 6A, 6B and lid members 9A, 9B are jointly arranged on both sides of the intermediate member 1, and are integrally fixed by a plurality of tightening members 8A, 8B. A valve hole 4 is formed inside.

The intermediate member 1 is provided with a fluid inflow passage 2 and an outflow passage 3 which are opened and communicated with a valve hole 4 formed therein with a gap in the axial direction, and the inflow passage 2 and the outflow passage 3 in the valve hole 4 are open. An annular valve seat portion 5 is formed protruding from the inner surface of the communicating portion. Reference numeral 11 denotes a valve body provided in the valve hole 4 so as to be freely movable in the axial direction, and has a valve part 12 in the center that is attached to and separated from the valve seat part 5 to cut off communication between the inflow and outflow passages 2 and 3. Balancing parts 13A and 18B are provided on both sides with an interval in the axial direction so as to substantially balance the pressures with respect to the fluid pressures of the inflow passage 2 and the outflow passage 8, and the balancing parts 1 of the valve body 11
81% 18B consists of a disk-shaped diaphragm, and the peripheral edge of the diaphragm is formed by being clamped between the intermediate member 1 and the clamping members 6A and 6B. 15A, 15B are fixing members made of electrical insulating material for fixing the diaphragm; 16A, 16;
B is a disc-shaped electrostrictive member that causes strain displacement when voltage is applied;
Each balance section 18A of the valve body 11.

Fixing members 15A, 15B are provided on the outside of the valve body 18B, and their peripheral portions are clamped between the clamping members 6A, 6B and the lid members 9A, 9B, and their center portions are in the respective balance portions 18A, 18B of the valve body work 1. They are fixed by screw members 17A and 17B made of electrically insulating material. The electrostrictive members 16A and 16B are made of a piezoelectric material (for example, quartz, barium titanate, lead zirconate titanate, vinylidene fluoride, and composites thereof) that generates strain displacement when voltage is applied. The same disc-shaped thin plates 18A and 19A, 18B and 19B are attached to both sides of disc-shaped metal plates 20A and 20B. Each thin plate 18A of electrostrictive member 16A116B
, 19A, 18B, 19B and metal plates 20A, 20B
The connected lead wires 21A, 22A, 21B, 22B and the lead wires 2:11A, 28B are held by sealing members 82A, 82B made of an elastic material and led out of the valve body 10, and each electrostriction is caused by applying a voltage. Members 16A, 16B
lead wires 21A, so that strain displacement occurs in the same direction at the same time.
22A, 21B, 22B and lead wires 28A, 28B are electrically connected to a DC voltage source 24 via a changeover switch 25 with different electrode polarities.

Next, the operation of this configuration will be explained.

The drawing shows a state in which voltage is cut off to the electrostrictive members 16A and 16B, and the valve body 11 is connected to the valve portion 12 by the electrostrictive members 16A and 16B.
is held in a position where it is seated on the valve seat portion 5, thereby blocking the inflow path 2 and the outflow path 8. At this time, the valve portion 12 and the balance portion 18A of the valve body 11.

The fluid pressures of the inflow path 2 and the outflow path 8 that act on the fluid 18B are approximately in pressure equilibrium. Now, by operating the changeover switch 25, each thin plate 18A, 19A,
When a positive voltage is applied to metal plates 18B and 19B and a negative voltage is applied to metal plates 20A and 20B from the DC voltage source 24, the thin plates 18A and 18B contract in the radial direction, and the thin plates 19A and 19B expand in the radial direction, causing electrostriction. The members 16A and 16B are bent and distorted downward in the axial direction, moving the valve body 11 downward in the axial direction and separating the valve portion 12 from the valve seat portion 5, thereby establishing communication between the inflow path 2 and the outflow path 8. . When the changeover switch 25 is operated to cut off the voltage to the electrostrictive members 16A and 16B, the thin plates 18A and 1
As the contraction of 8B returns to its original state, the expansion of the thin plates 19A and 19B returns to their original state, and the electrostrictive members 16A and 16B are returned to the illustrated state, and the valve body 11 is returned to its original position to open the inflow path 2 and the outflow path. 3.

Due to the axial movement of the valve body 11, the pressure of the valve body 11 is approximately in equilibrium with the pressure of the fluid flowing through the inflow passage 2 and the outflow passage 3, so that the valve body is 11 can be moved well over a wide range of fluid pressures, and can be made into a valve suitable for opening and closing relatively high-pressure fluids. Further, by providing the valve element 11 having the valve part 12 that is attached to and separated from the valve seat part 5 to block communication between the inflow and outflow passages 2.8, it is unnecessary to move the valve element 11 for a long time, and the electrostrictive member 1
The strain displacement of 6A and 16B allows the valve to be made suitable for movement.

Furthermore, the valve body 11 can be well supported by the electrostrictive members 16A and 16B on both sides, and it is also possible to easily realize a valve with a relatively large flow rate.

FIG. 2 shows a case where an electrostrictive member with a different configuration is used. The electrostrictive member 26 has a structure in which thin plates 27 and 28 having different polarization directions are directly pasted together, and lead wires connected to the thin plates 27 and 28 are shown in FIG. 29 and 30 are connected to the DC voltage source 81 with different electrode polarities so as to obtain the same effect.

In addition, when implementing the present invention, the balance portion 1 of the valve body 11
: Instead of the diaphragm, IIA and 18B may be replaced with a beaded glass, or a piston portion that slides in the valve hole 4 may be integrally formed. Further, the valve seat portion 5 may be formed by recessing the inner surface of the valve hole 4, and the valve body 1O is composed of the intermediate member 1, the clamping members (iA, 5B, and the lid members 9A, 9B). Of course, it is not limited to this.

〔Effect of the invention〕

As described above, according to the present invention, by providing the balancing portion so as to substantially balance the pressures of the fluids in the inlet passage and the outlet passage, the valve can be made suitable for opening and closing relatively high-pressure fluid. In addition, by providing a valve body with a valve part that connects and separates from the valve seat part to shut off communication between the inflow and outflow channels, there is no need to move the valve body for a long time, making it suitable for movement due to strain displacement of the electrostrictive member. It can be used as a valve. Furthermore, the valve body is well supported, and furthermore, it has the advantage that it can easily be made into a valve with a relatively large flow rate.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of an on-off valve, and FIG. 2 is a partial sectional view using another electrostrictive member. 2-m-inflow path, 3-first outlet path, 4--one valve hole, 5--
1-valve seat part, 11-m-valve body, 12-m-valve part, 13a,
13n--balanced part, 16A, 16B, 26-electrostrictive member.

Claims (1)

[Claims] A valve seat is formed in a valve hole that communicates an inflow passage and an outflow passage with a fluid in the axial direction with a gap therebetween, and a valve part that is attached to and separated from the valve seat part cuts off communication between the inflow and outflow passages. A valve body is provided in the valve hole so as to be freely movable in the axial direction, and the valve body is provided with a balancing part on both sides of the valve part with a gap in the axial direction so as to substantially balance the pressure with the fluid pressure of the inlet passage and the outlet passage. , a plate-shaped electrostrictive member that generates strain displacement when a voltage is applied is electrically connected to the outside of each balanced part of the valve body so as to simultaneously generate strain displacement in the same direction and move the valve body in the axial direction. valve.