Piezoelectric type high-speed large-flow two-position three-way valve

Abstract

The invention discloses a piezoelectric type high-speed large-flow two-position three-way valve. The two-position three-way valve comprises a valve body, wherein the valve body is provided with an opening end and a closed end; a bonnet is arranged at the opening end of the valve body; a cavity of the valve body is a step cavity consisting of a first cavity and a second cavity; an outer valve element penetrates in the first cavity; one end of the outer valve element extends to the closed end of the valve body; the other end of the outer valve element extends to the opening end of the valve bodyand penetrates in the second cavity; a piezoelectric ring which is ring-shaped, and can be electrified to deform and drive the outer valve element to slide axially is arranged in the second cavity and positioned between the outer valve element and the bonnet; a cavity of the outer valve element is successively divided into a first cavity, a second cavity, a third cavity and a fourth cavity from the end facing the opening end to the other end; a first inner valve element penetrates in the first cavity; and a second inner valve element penetrates in the fourth cavity. By an inverse piezoelectric effect of a piezoelectric ring, the outer valve element can rapidly respond and act, the control precision is high, the flow is large, and the responding speed is high.

Description

Technical field [0001] The invention relates to a two-position three-way valve, in particular to a piezoelectric high-speed large-flow two-position three-way valve. Background technique [0002] At present, the marine diesel electronically controlled fuel injection system has very high requirements for high-speed and large-flow solenoid valves: it must meet the requirements of large flow, high-speed response, high control accuracy and good consistency; at the same time, it must be able to operate under high pressure, high temperature, Under severe conditions such as high humidity and vibration, it can work stably and reliably at a high frequency according to the control requirements of the system. However, the high-pressure, large-flow and fast response of high-speed and large-flow valves are often a contradiction. The requirement of large flow needs to be achieved by increasing the flow area of ​​the valve port, which increases the quality of the valve core, thereby increasing ...

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Problems solved by technology

[0003] In the prior art, the Chinese utility model patent with the authorized announcement number CN1131387C discloses a two-position three-way solenoid valve with a double free inner cone valve core. Although the solenoid valve has high-speed dynamic response performance and large flow characteristics, it is actually used There are the following problems: because the outer spool of the solenoid valve is reset by the elastic force of the return spring, and it is difficult to ensure the same precise elastic force for the same type of spring, so it is difficult to guarantee the same type of solenoid valve during production of this solenoid valve. Have the same response speed, resulting in low control precision of the solenoid valve

[0004] The Chinese invention patent with the authorized notification number CN103851226B discloses a high-speed and large-flow self-resetting solenoid valve. Although the solenoid valve has high-speed dynamic response performance and large flow characteristics, it has the following problems in actual use: due to the external valve of the solenoid valve The core relies on the hydraulic pressure to reset, so that the electromagnetic force required to open the solenoid valve is large, the trigger current is large, the heat is serious after long-term work, and the hydraulic pressure changes complicatedly when the solenoid valve is opened and closed, so it is difficult for this solenoid valve to have the same Response speed, resulting in low control precision of the solenoid valve

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