Flow path switch control device

Abstract

The invention discloses a flow path switch control device which is used for control systems, such as heating ventilating and air conditioning, refrigeration and the like. In the prior art, because the pressure of the upper part of a piston instantaneously lowers at the moment that a pilot valve is switched on and off, a larger pressure difference is formed between the upper part and the lower part of the piston to push the piston to move so as to generate strong impact with a piston stopping component, and the service life of a product and the operation stability of a refrigeration system are influenced. The flow path switch control device comprises a fluid inlet, a fluid outlet, a valve device and a pressure balance control loop, wherein the valve device is arranged between the fluid inlet and the fluid outlet; the pressure balance control loop is also provided with a regulation device for alleviating the pressure variation of fluid flowing through the pressure balance control loop when the flow path switch device is opened and closed, so that the flow path switch control device is stable when being switched on and off, the problems of intense vibration and high noise at the moment of high differential pressure movement are solved.

Description

technical field [0001] The invention relates to the field of fluid control, in particular to a switch device used in control systems such as heating, ventilating, air-conditioning, refrigeration, etc., in particular to a flow path switch control device suitable for large capacity and high pressure. Background technique [0002] Electromagnetic switches are often used in HVAC, refrigeration and other systems involving temperature control and regulation. The main principle is to use the electromagnetic force generated after the coil is energized to control the up and down movement of the core iron, so that the solenoid valve can be opened or closed in the air conditioning system. Close, so as to control the on-off of the medium in the pipeline system. With the gradual increase of personal housing area and the increase of buildings such as large shopping malls, the demand for large-capacity air-conditioning units is gradually increasing. In such large-capacity air-conditioning ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to control and slow down the change of the fluid pressure passing through the valve device by improving the large-diameter electromagnetic switch structure of the prior art in the refrigeration system, and gradually increase the pressure during the valve opening process Balance the flow area of ​​the fluid in the control circuit to gradually increase the pressure difference between the front and back of the valve body, so that the valve opens smoothly without strong impact and vibration, and avoids strong vibration and noise generated by the electromagnetic switch at the moment of high pressure difference action problem, for this reason the present invention adopts the following scheme:

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