Gas cylinder integrated valve for automotive liquefied natural gas

Abstract

The invention relates to a gas cylinder integrated valve for automotive liquefied natural gas, which is characterized in that a distributing head is a porous cavity having a flat cylindrical shape, wherein a pipeline is reserved in the distributing head; a plurality of threaded interfaces are arranged on an upper end face of the distributing head; a one-way throttle valve, a stop valve I, a liquidometer sensor component, an economical gas throttle valve, an emergency cut-off valve, a stop valve III and a pressurizing pressure regulating valve are all sealed by using low-temperature resisting sealing elements and are directly integrated and connected with the corresponding threaded interfaces of the distributing head through threads; a connecting pipeline between the valve and the distributing head in the prior art is abandoned; three welded thread ports and liquid filling interfaces are respectively welded with side holes of the distributing head and are integrated with the distributing head; the liquid level height in the gas cylinder is detected by the liquidometer sensor component; the change in pressure is monitored by a pressure gage; and the safety of the gas cylinder and system is ensured by a double insurance which is formed by a first-level safety valve and a second-level safety valve. The gas cylinder integrated valve for automotive liquefied natural gas has the advantages of compact structure, excellent reliability and safety, lower cost, convenience in detecting and maintaining, and the like.

Description

technical field [0001] The invention relates to an integrated valve for liquefied natural gas cylinders for vehicles, which belongs to the technical field of low-temperature liquefied natural gas applications, and is particularly suitable for filling and supplying liquids for liquefied natural gas cylinders for vehicles. Background technique [0002] Liquefied natural gas (LNG) cylinder is a kind of cryogenic liquid insulated cylinder, and the liquid filling and liquid supply of LNG cylinder must be realized through various control valves. In the background technology, at present, domestic and foreign liquefied natural gas cylinder manufacturers all adopt the connection method of "distribution head-stainless steel pipe-control valve-stainless steel pipe-connector-external pipeline" in the installation of their control valves, that is, in Multiple stainless steel pipes are welded to the multiple interfaces of the distribution head, and then the stainless steel pipes are welde...

AI Technical Summary

Problems solved by technology

The main defect of this connection method in actual use is that it is difficult to manufacture and maintain, especially once the valve is damaged, the stainless steel pipe must be cut and welded to repair or replace the valve. Steel pipes will increase heat transfer, which is not conducive to the insulation of cryogenic cylinders

The patent with the publication number CN101761776A discloses a dispensing head on a vehicle-mounted gas cylinder, which moves the one-way valve at the liquid inlet to prevent backflow to the middle and rear of the distributing head, which increases the filling speed to a certain extent , but other control valves are still connected to the distribution head through stainless steel pipes, which also have the defects of difficult manufacturing and maintenance, and poor thermal insulation effect at low temperature

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