Electromagnetic automatic control valve

Abstract

The invention discloses an electromagnetic automatic control valve. The lower section of a valve body is provided with an air inlet and a piston cavity; a sealing piston and a screw plug with an air outlet are arranged in the piston cavity; a spring is arranged at the upper end of the sealing piston; a coil is wound on the outer surface of the upper section of the valve body; a spool chamber is arranged inside the upper section of the valve body; a valve element is arranged in the spool chamber and can move up and down; an outer cover is arranged on the outer surface of the upper section of the valve body; the valve body between the spool chamber and the piston cavity is a center valve body; the following two air ducts are arranged in the center valve body: one air duct is a middle section pressurization air duct which is uncommunicated with the piston cavity and is communicated with the spool chamber and the other air duct is a pressurization and decompression air duct which is communicated with both the piston cavity and the spool chamber; the middle section pressurization air duct is communicated with the air inlet and a first section pressurization air duct is arranged between the middle section pressurization air duct and the air inlet; and the pressurization and decompression air duct is communicated with the air outlet and a decompression air duct is arranged between the pressurization and decompression air duct and the air outlet. The switching-on and switching-off between the middle section pressurization air duct and the pressurization and decompression air duct are controlled by controlling a power supply of the coil, so that the low voltage switching control is implemented.

Description

Technical field [0001] The invention relates to an electric control valve, in particular to an electromagnetic automatic control valve that uses air pressure at an air inlet to realize a low-voltage control switch. Background technique [0002] The electronic control valve is mainly used for the exhaust control of high-pressure gas. The principle is to use the control of the coil power supply to realize the on-off state of the electronic control valve to control the discharge of high-pressure gas and the discharge amount. [0003] For example, the compressor used in the refrigeration cycle of automobile air conditioning is driven by the engine, and the speed of the engine changes according to the movement state of the automobile. The variable capacity compressor with variable refrigerant displacement can obtain sufficient cooling capacity when the engine is idling. In a variable displacement compressor, the main shaft is driven by the engine to drive the hinge mechanism in the cra...

AI Technical Summary

Problems solved by technology

[0006] Although the above-mentioned traditional electronically controlled valves have their own advantages and solve corresponding problems, they all have a common problem: in order to achieve the no-leakage effect when closing, a spring with a large spring force is required for the valve stem ( In this patent, the piston is pressed for the corresponding parts used for opening and closing), resulting in a relatively high opening pressure. The energy consumption is high, and the control accuracy is reduced, and the safety pressure point is difficult to adjust

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