Pilot-operated type gas injection valve

Abstract

The invention discloses a pilot-operated type gas injection valve which comprises a valve body and a solenoid valve. A partition is arranged in the valve body and provided with a first through hole. The tail of a valve element is in sliding fit with the first through hole. A shaft seal device is arranged between the tail of the valve element and the through hole of the partition. A high-pressure cavity communicates with a gas inlet, and a low-pressure cavity communicates with a gas outlet. The solenoid valve is provided with a working fluid connector communicating with the high-pressure cavity, the low-pressure cavity and a high pressure and low pressure conversion cavity. When the high-pressure cavity communicates with the high pressure and low pressure conversion cavity, the gas injection valve is closed; and when the low-pressure cavity communicates with the high pressure and low pressure conversion cavity, the gas injection valve is opened. According to the pilot-operated type gasinjection valve, resultant force of pressure force acting on the valve element is controlled through the solenoid valve, motion of the valve element is achieved, the motion speed of the valve elementand the flow of the valve are increased, and the pilot-operated type gas injection valve is especially suitable for large or super-large gas injection valves.

Description

technical field [0001] The invention relates to the technical field of gas injection valves, in particular to a gas injection valve with double valves and large flow. Background technique [0002] Chinese invention patent CN104197027A discloses an integral pilot-operated gas injection valve and its assembly method. The gas injection valve has two valves, and its integral valve core has two valve plates, one valve plate and one valve seat are matched. Form a valve, the outer diameter of the front valve plate is smaller than the outer diameter of the rear valve plate, and the outer diameter of the front valve plate is slightly smaller than the vent hole inner diameter of the rear valve seat, so that the valve core can be loaded from right to left as a whole. [0003] The above-mentioned gas injection valve realizes the opening of the valve by electromagnetic force, and realizes the closing of the valve by the spring force of the return spring. If it is applied to a super-larg...

AI Technical Summary

Problems solved by technology

If it is applied to a super-large gas injection valve, as the diameter of the valve increases, the area difference between the two valve pieces becomes larger and larger, the resultant force of the gas pressure becomes larger, and the electromagnetic force required to open the valve becomes larger and larger. , so higher requirements are put forward for the electromagnetic force, and it becomes more and more difficult to realize the high-speed response of the valve.

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