Gas path pressure release device and corresponding gas path pressure release device realizing large pressure reducing ratio

Abstract

The invention relates to an air path relief device. A housing of the relief device is provided with a piston cavity. The two ends of the piston cavity are communicated and provided with a relief spring chamber and a top rod chamber in a same axis. The piston cavity is provided with a piston. The relief spring chamber is provided with a relief spring in top pressure cooperation with the inner end and the piston. The external end of the relief spring is in top pressure cooperation with a pressure regulating screw cap spirally arranged in an external port of the relief spring chamber. An inner axis of the top rod chamber is provided with the top rod the inner end of which is in top pressure cooperation with the piston. The top rod is provided with a top pressure spring driving the top rod to support and press the piston. A valve sealing structure consisting of a dynamic sealing surface covered on the top rod and a static sealing surface arranged at a channel location is arranged on the channels of the top rod chamber and the piston cavity. The top rod chamber which is a sealing space is communicated with an air inlet. The channel between the piston and the sealing structure is communicated and provided with an air distributing cabin. The invention realizes feedback through changing the force way and sealing way of the piston and by using a secondary relief mechanism and has a good stability.

Description

technical field [0001] The invention relates to a gas path decompression device and a corresponding gas path decompression device realizing a large decompression ratio. Background technique [0002] At present, known decompressors are mostly made up of preload spring, decompression spring, piston, push rod, sealing surface, and pressure distribution chamber. The ejector rod and the sealing surface of this kind of pressure reducer are integrated. When the piston is subjected to high air pressure, the piston moves, driving the ejector rod to move, the sealing surface moves away with the ejector rod, the gas passage, the pressure reducer opens, and due to the interception and decompression, The output pressure is lower than the inlet pressure to achieve the decompression effect. But the known pressure reducer works under the resultant force of the spring force and the force that the piston is subjected to, because the air pressure working pressure is higher, the force of the d...

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Problems solved by technology

However, the known pressure reducer works under the resultant force of the spring force received by the piston and the force received by the piston. Because the air pressure working pressure is relatively high, the force of the decompression spring is large, and it is difficult to adjust the force of the pressure decompression spring, and the decompression ratio is small.

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