JPH0331891Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a directional control valve, and more particularly, to a directional control valve whose valve seat is opened and closed by a piezoelectric actuator.

[Prior Art] A directional control valve that utilizes the property of a piezoelectric element to be distorted when energized and opens and closes a valve seat using a valve body provided in a piezoelectric actuator using the piezoelectric element is disclosed in Japanese Patent Application Laid-Open No. 56-76779. Publication No. 61-152872
It is already known from the publication.

However, in the above-mentioned known directional control valve, the valve seat is opened and closed by a valve body provided on a single piezoelectric actuator whose one or both ends are fixed to the valve body, etc., so the valve seat is closed by the valve body. Not only is the seating uneven and prone to leaks, but the sealing force is small, which limits the usable flow rate and pressure.

In order to solve this problem, it is possible to drive the valve body using multiple piezoelectric actuators, but since the performance of each piezoelectric actuator varies, it is difficult to simply increase the number of piezoelectric actuators. Not only does the acting force of each piezoelectric actuator interfere with each other, reducing the efficiency of the actuator, but also creates a new problem in that wiring requires trouble.

[Problem to be solved by the invention] The problem to be solved by the invention is to provide a directional control valve using a piezoelectric actuator that has good sealing performance of the valve body, good efficiency of the piezoelectric actuator, and can simplify wiring. It is in.

[Means for Solving the Problems] In order to solve the above problems, the present invention opens and closes a valve seat formed in a valve chamber of a valve body using a valve body provided on a piezoelectric actuator whose one end is fixed to the valve body. In the directional control valve, the piezoelectric actuator is configured to include a fixed part integrally formed with the substrate, a substrate having a plurality of displacement parts integrally formed with the fixed part and extending at substantially equal angles toward the valve body, and each displacement part. and a piezoelectric element attached from near the tip of the section to the fixed section, and the free ends of the plurality of displacement sections are swingably locked to the valve body.

[Operation] When a voltage of a predetermined polarity is applied to the piezoelectric actuator, the actuator is distorted and the valve body opens or closes the valve seat, and when the voltage is removed from the piezoelectric actuator or a voltage of the opposite polarity is applied. , the actuator is deflected in the opposite direction and the valve body is moved to another operating position.

In this case, since the valve body is swingable relative to the free ends of the plurality of displacement parts arranged at approximately equal angles to the valve body, the movement posture of the valve body when the piezoelectric actuator is distorted is Not only is the sealing performance improved by being stable and evenly seated on the valve seat, but the sealing force of the valve body is increased by providing piezoelectric elements in each of the multiple displacement parts, so the operating range of flow rate and pressure can be reduced. Can be expanded.

In addition, the efficiency of the piezoelectric actuator is improved because each displacement part can be freely distorted without interfering with each other.Furthermore, since the fixed part of the substrate that makes up the piezoelectric actuator is integrally formed, wiring to the piezoelectric actuator is simplified. It's easy.

[Example] Figures 1 and 2 show three directional control valves of the present invention.
An example is shown in which a port valve is used, and the valve body 1
is constructed by integrating main body members 1a and 1b by appropriate means, and a valve seat 2 is formed inside, and a valve chamber 2 is provided approximately at the center of main body members 1a and 1b. Inlet port 3 and outlet port 4 leading to
are opened with their valve seats 3a and 4a facing each other, and an output port 5 is opened in the valve chamber 2.

The piezoelectric actuator 7, one end of which is sandwiched between the peripheral walls of the valve bodies 1a and 1b, has a substrate 8 and a piezoelectric element 9.
It is configured as a bimorph type consisting of a and 9b. As shown in FIG. 2, the substrate 8 has substantially equal angle notches 8c, . A plurality of displacement parts 8b of equal size,...
..., the piezoelectric elements 9a, 9b have displacement parts 8b,
... from near the tip to the fixed part 8a, and when a voltage is applied with a predetermined polarity, the displacement part 8b, ... and the piezoelectric element 9a,
9b is distorted in one direction, and when the voltage application is removed or a voltage of the opposite polarity is applied, the distortion occurs in the opposite direction.

The displacement portion 8a and the piezoelectric elements 9a, 9b in the piezoelectric actuator 7 may be fan-shaped as shown in the upper part of FIG. 2, or may be formed into a fan shape as shown in the lower part of FIG. It can also be rectangular.

As described above, since the fixing portion 8a of the substrate 8 in the piezoelectric actuator 7 is integrally formed, there is no need to perform wiring for each substrate 8 separately.

Displaced portion 8b of the substrate 8, free end 10,
... are swingably inserted into locking grooves 13a, ... having a V-shaped cross section, formed on the outer periphery of the valve frame 13 having the valve member 12, and
3 is biased in the direction of closing the valve seat 3a by a spring receiver 15 fitted at one end being pressed by a return spring 16 contracted within the valve chamber 2. .

Although not shown, the valve seats 3a, 4a
can be formed by a hollow screw member screwed onto the main body members 1a, 1b, and in this case, the stroke of the valve member 1 can be adjusted by moving the screw member back and forth.

In the above embodiment, as shown in FIG.
When a voltage of a predetermined polarity is applied to the piezoelectric actuator 7 in a state where the valve seat 3a is closed and the valve seat 4a is opened, the piezoelectric actuator 7 moves to the substrate 8 sandwiched between the main body members 1a and 1b. The valve element 14 opens the valve seat 3a and closes the valve seat 4a. Therefore, the pressure fluid from the inlet port 3 flows out from the outlet port 5.

Further, when the application of voltage to the piezoelectric actuator 7 is canceled or a voltage of the opposite polarity is applied, the valve body 14 returns to the illustrated state, and the fluid from the outlet port 5 is discharged from the discharge port 4.

In this case, the valve body 14 has a plurality of displacement portions 8b, . . . , free ends 10, .
Since it can be swung relative to ..., its moving posture is stable and it seats uniformly on the valve seats 3a and 4a, improving sealing performance.In addition, each displacement part is free to be distorted and does not interfere with each other. Therefore, it is possible to close the valve seat with a large force and expand the usable range of flow rate and pressure.

Furthermore, since the fixing portion 8a of the substrate 8 in the piezoelectric actuator 7 is integrated, a plurality of displacement portions 8
b, . . . but the wiring is simple.

Furthermore, since there is no need to take the trouble of integrally attaching the valve body 14 to the piezoelectric actuator 7, assembly and disassembly of the valve body is easy even though the valve body 14 is driven by a plurality of displacement parts 8b, . It's extremely easy.

[Effects of the invention] In the directional control valve of the invention, the free ends of the plurality of displacement parts extending at approximately equal angles from the substrate constituting the piezoelectric actuator are swingably locked to the valve body.
The moving posture of the valve body is stabilized, and the valve body is seated uniformly on the valve seat, improving sealing performance.

In addition, by driving the valve body with multiple displacement parts, the sealing force is increased and the usable range of flow rate and pressure is expanded, but each displacement part is freely distorted and does not interfere with each other. Not only can the efficiency of the actuator be improved, but also the wiring of the piezoelectric actuator is simple because the fixing part of the substrate is integrally formed.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a vertical front view, and FIG. 2 is a plan view of the main part. The following shows the case where is made into a rectangle. DESCRIPTION OF SYMBOLS 1... Valve body, 2... Valve chamber, 3a, 4a... Valve seat, 7... Piezoelectric actuator, 8... Substrate, 8
a... fixed part, 8b... displacement part, 14... valve body.

Claims (1)

[Scope of Claim for Utility Model Registration] A directional control valve in which a valve seat formed in a valve chamber of a valve body is opened and closed by a valve body provided on a piezoelectric actuator whose one end is fixed to the valve body, wherein the piezoelectric actuator is integrated with the piezoelectric actuator. a fixed part formed in a base plate, and a substrate having a plurality of displacement parts integrally with the fixed part and extending at substantially equal angles toward the valve body;
and a piezoelectric element attached from near the tip of each displacement part to a fixed part, and the free ends of the plurality of displacement parts are swingably locked to the valve body. valve.