JPS62171570A - Closing valve - Google Patents

Abstract

PURPOSE:To ensure the linearity, prevent the generation of heat and accurately control the valve, by fixing one end of a spring valve member and connecting a piezoelectric actuator for applying a lateral load to the valve member with the other end of the valve member. CONSTITUTION:A valve housing 3 is provided with a fluid inlet 1 and a fluid outlet 2 at upper and lower opposed positions. A valve member 4 formed of a flat spring having a required curvature is located at the upper position of the outlet 2 in the valve housing 3. A valve seat 5 having a curvature corresponding to the curvature of the valve member 4 is provided around the outlet 2. The valve member 4 is engaged at its one end with a fixed stopper 6, and at the other end with a movable stopper 7. The movable stopper 7 is connected with a piezoelectric actuator 8 formed by stacking a plurality of piezoelectric elements. When a voltage is applied to the actuator 8 to apply a lateral load to the valve member 4, a couple is generated in the valve member 4 to displace same upwardly, thereby opening the outlet 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an on-off valve with a simple structure that utilizes the high responsiveness and large force of a piezoelectric element.

[Prior art] For example, a spool-type valve used for hydraulic control etc.
Due to constraints on geometry and machining, there is a problem that linearity is lost in the vicinity of the flow MO, and at the same time, heat generation occurs due to pressure loss, so the influence of the heat of the working fluid cannot be overlooked.

[Problems to be solved by the invention] In view of these circumstances, the present invention establishes linearity in the vicinity of flow 10 by introducing digital control such as pulse width modulation control, and suppresses heat generation due to pressure loss. Compared to analog valve control, this ensures linearity, prevents heat generation,
The purpose of this invention is to provide an on-off valve that enables precise control.

[Means for Solving the Problems J] The present invention provides a valve seat having a predetermined curvature surrounding the outlet in a valve box having a fluid inlet and an outlet, and a thin plate corresponding to the valve seat. It has a structure in which a spring valve body is arranged, one end of the valve body is fixed, and a piezoelectric actuator for applying a lateral load to the valve body is connected to the other end of the valve body.

(Function) Therefore, when the valve body is bent by the piezoelectric actuator,
A gap is formed between the valve body and the valve seat, and the outlet is heard.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, a valve body 4 made of a thin plate spring having a required curvature is arranged in a valve box 3 in which a fluid inlet 1 and an outlet 2 are provided in vertically opposed positions so as to be located above the outlet 2. At the same time, a valve seat 5 corresponding to the curvature of the valve body 4 is provided around the outlet 2, and a fixed stopper 6 and a movable stopper 7 are engaged with one end of the valve body 4. A piezoelectric actuator 8 is connected to a piezoelectric actuator 8 formed of a fa layer.

In such a configuration, when a voltage is applied to the actuator 8 and a load is applied to the valve body 4 from the lateral direction, the valve body 4 generates a couple due to the deviation between the apex and the point of application, causing the valve body 4 to be displaced upward. As a result, gaps are formed between the valve body 4 and the valve seat 5 on both sides, and the outlet 2 is opened. On the other hand, when the voltage of the actuator 8 is removed and the stored charge is released, the load on the valve body 4 is removed, and the valve body 4 recovers to its initial state due to the spring restoring force and comes into close contact with the valve seat 5 and exits. 2 closes. At this time, since the fluid pressure from the inlet side acts on the upper surface of the valve body 4, the sealing performance becomes even more reliable.

In the above, the maximum deflection of the thin plate spring constituting the valve body 4 occurs at the center, where Pk: buckling load e: deviation, which is proportional to the load and the deviation, and a relatively large displacement can be taken out. Therefore, linearity can be maintained even near the flow rate O by controlling the voltage of the actuator 8 by introducing digital control such as pulse width modulation control.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, according to the on-off valve of the present invention, the flow path is opened and closed by applying deflection to the valve body made of a thin plate spring using a piezoelectric actuator, so digital control is introduced. By doing so, linearity can be established in the vicinity of the flow rate O, and there is no heat generation due to pressure loss, and excellent effects such as enabling precise control can be achieved.

[Brief explanation of drawings]

FIG. 1 is a detailed explanatory diagram of the present invention. 1 is the inlet, 2 is the outlet, 3 is the valve box, 4 is the valve body, 5 is the valve seat,
6 is a fixed stopper, 7 is a movable stopper, and 8 is a piezoelectric actuator. Patent application Hitoshi Kawajima Harima Heavy Industries Co., Ltd.

Claims (1)

[Claims] 1) A valve seat having a required curvature so as to surround the outlet is provided in a valve box having a fluid inlet and outlet, and a valve body made of a thin plate spring corresponding to the valve seat is disposed, and the valve body An on-off valve characterized in that one end of the valve body is fixed, and a piezoelectric actuator for applying a lateral load to the valve body is connected to the other end of the valve body.