JPS60139981A - Valve utilizing piezo-electric element - Google Patents

Abstract

PURPOSE:To amplify a distance of the displacement of a piezo-electric element to be transmitted to a valve unit, by providing a space, which contains a pressure transmitting medium, of large contour in a side of the piezo-electric element while of small contour in a side of the valve unit, in the case of a valve utilizing the piezo-electric element. CONSTITUTION:The main unit 1 of a valve forms a primary port 1a and a secondary port 1b, supporting a needle valve unit 2 in the bottom of a containing space S2 in the bottom of a containing space S2 of small contour filled with silicone oil L used as a pressure transmitting medium. While the main unit 1, forming a containing space S1 of larger contour successively to the containing space S2, provides a piston 4 on the upper part of the space S1, and a piezo- electric element E fixed by a supporting member 5 is adapted to the piston 4. If voltage is input from an electrode 7, the piezo-electric element E is displaced, and its displacement is transmitted to the needle valve unit 2. In this way, the valve unit 2 of this kind can be surely driven by amplifying the action of the piezo-electric element E to be transmitted to the valve unit 2 and increasing its stroke.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve using a piezoelectric element.
・Piezoelectric elements are small and lightweight, yet have high resolution, fast response speed, and generate large force, so they are suitable as valve drive members based on electrical signals in relatively small valves, but the amount of displacement is small. There is a drawback. In order to solve this problem, products have appeared in which a large number of piezoelectric elements are stacked to increase the amount of displacement, but this is still insufficient to drive the valve.

The present invention has been made focusing on the above-mentioned points,
A space for housing a pressure transmission medium of a large diameter on the piezoelectric element side and a small diameter on the valve body side is continuously provided, so that the amount of displacement of the piezoelectric element is amplified by the pressure transmission medium and transmitted to the valve body. It is.

Examples of the present invention will be described below.

In FIG. 1, a primary port 1a and a secondary port lb are formed in the valve body 1, and a valve seat IC is formed between them.
On the secondary roller lb side, a needle valve body 2 is slidably supported and mounted below a small-diameter accommodation space S2 filled with silicone oil L as a pressure transmission medium, and comes into contact with and separates from the valve seat IC. . A spring 3 is provided between the needle valve body 2 and the valve body 1 to bias it in the valve opening direction.

A large-diameter storage space S that is continuous to the storage space S2 above.
A piston 4 is provided above the space Sl, and a piezoelectric element E fixed by a support member 5 at the upper end of the valve body 1 is in contact with the piston 4. Spaces S+ and S2 are filled with silicone oil L as a pressure transmission medium. 6 is the 0 ring.

In the above configuration, when a signal voltage is input from the electrode 7, the piezoelectric element E is displaced in accordance with the voltage, and the amount of displacement is amplified by the silicone oil L and transmitted to the needle valve body 2.

In this case, a highly elastic rubber material may be used as the pressure transmission medium, and if this is used, the transition portion from the large-diameter accommodation space S+ to the small-diameter accommodation space S2 is formed in a tapered shape. Just do it.

In the embodiment of FIG. 2, the large-diameter accommodation space SL is formed by the large-diameter bellows B+, and the small-diameter maximum space S2 is formed by the small-diameter bellows B2,
Both bellows m+", the opposite end of B2 is a fixed ring member 10
The other end of the large-diameter bellows B1 is connected to the piezoelectric element E, and the needle valve body 2' is fixed to the free end of the small-diameter bellows B2. A return spring 3' is provided between the free ends.

In this case, the large-diameter bellows B1 is contracted to the same extent by the operation of the piezoelectric element E, and the small-diameter bellows B1 is expanded and expanded in the axial direction by the silicone oil filled inside, thereby driving the needle valve 2'. do.

Since the present invention is constructed as described above, it has the advantage that the movement of the piezoelectric element can be magnified and transmitted to the valve body, thereby increasing the stroke of this type of valve body.

[Brief explanation of drawings]

FIG. 1 is a sectional view of one embodiment of the present invention, and FIG. 2 is a sectional view of another embodiment. 2... Valve body, E... Piezoelectric element, Sl.
...Large diameter accommodation space, B2...Small diameter accommodation space, L...Pressure transmission medium. Patent applicant: Saginomiya Seisakusho Co., Ltd.

Claims (1)

[Claims] A large-diameter accommodation space and a small-diameter accommodation space are continuously provided between the valve body and the piezoelectric element from the piezoelectric element side, and the pressure transmission medium is filled across the re-accommodation space, and the valve body A valve using a piezoelectric element, characterized by being provided with a spring.