Large-flow three-stage pilot type electromagnetic valve

Abstract

The invention provides a large-flow three-stage pilot type electromagnetic valve which solves the problems that the pressure load is too large, the response speed is slow and the system index requirement cannot be met under the conditions of large flow and small flow resistance of an existing valve. The high-flow three-stage pilot type electromagnetic valve comprises a first-stage electromagneticpilot valve, a second-stage pneumatic control pilot valve and a third-stage control main valve; the third-stage control main valve comprises a main valve body, a main valve core and a main valve spring; the main valve core is hermetically arranged in the main valve body, and two independent air cavities, namely an air opening cavity and a main valve spring mounting cavity are formed between in main valve body; the main valve body is provided with a medium inlet and a medium outlet; the main valve spring is arranged in the spring mounting cavity and provides closing force for the main valve core, so that the medium inlet and the medium outlet are blocked; the first-stage electromagnetic pilot valve controls the on-off of a gas path of the second-stage pneumatic control pilot valve through on-off of power, and the second-stage pneumatic control pilot valve is used for controlling inflation and exhaust of the air opening cavity and providing opening force for the main valve core.

Description

technical field

[0001] The invention belongs to the electromagnetic control valve technology, and specifically relates to a three-stage pilot solenoid valve with large flow rate, which can be used as a large-flow fast-response control valve for high-pressure medium in liquid rocket engines, satellite in-orbit execution power systems, and ground test systems, to realize the control valve. On-off and sealing control of medium passage. Background technique

[0002] With the transformation and upgrading of aerospace equipment, the tactical and technical indicators of the power system continue to improve, and the requirements for the response performance of the engine are increasing. The large flow and fast response control valve technology has become a key technology that restricts the performance of equipment. In a liquid injection system, the requirements for the development of a large-diameter fast-response control valve with a flow rate of 5kg / s (flow resistance required to ...

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