Liquefied natural gas automobile fuel gas self-pressurization gas supply system and technical control

Abstract

The invention relates to a liquefied natural gas automobile fuel gas self-pressurization gas supply system and technical control, belonging to the mechanical field. A low temperature storage tank is internally fixed with a pump body which is electrically connected with one end of a liquid phase pipe, the low temperature storage tank is electrically connected with one end of a gas phase pipe, the other end of the liquid phase pipe is electrically connected with the lower end of one end of a carburetor, the other end of the gas phase pipe is electrically connected with the upper end of one end of the carburetor, the lower end of the other end of the carburetor is electrically connected with one end of a lower gas phase pipe, the upper end of the other end of the carburetor is electrically connected with one end of an upper gas phase pipe, the other end of the lower gas phase pipe is electrically connected with one end of a lower electromagnetic valve, the other end of the upper gas phase pipe is electrically connected with one end of an upper electromagnetic valve, the other end of the lower electromagnetic valve is electrically connected with a lower inlet end of a mixing pipe, the other end of the upper electromagnetic valve is electrically connected with an upper inlet end of the mixing pipe, the outlet end of the mixing pipe is fixed with the inlet end of an engine, the engine is electrically connected with a controller, and the controller is electrically connected with the lower and the upper electromagnetic valves. The pressure of the low temperature storage tank is 0-0.5MPa, and the pressure at the gas inlet end of the engine is 0.5-3MPa. The invention is applied for gasifying and pressurizing vehicle fuel and controlled by liquid-gas double ways of the pump body inside the storage tank.

Description

technical field [0001] The invention relates to a self-pressurized gas supply system for liquefied natural gas vehicles and its technical control, and relates to the field of mechanical technology; in particular, it relates to the technical field of mechanical devices and electrical control for supercharging, vaporizing and transporting liquefied natural gas in low-temperature gas cylinders carrying fuel for natural gas vehicles. Background technique [0002] At present, natural gas vehicles, due to the particularity of vehicle use space and conditions, require the energy density of liquefied natural gas (LNG) fuel to be stored as high as possible, in order to meet the limited storage volume conditions of LNG cryogenic cylinders and the limited installation space of vehicles. Achieve longer cruising range. Specifically, LNG in the normal-pressure state is stored in the vehicle-mounted LNG cryogenic gas cylinder and used as fuel for automobiles; in this way, compared with CNG...

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Problems solved by technology

[0004] The present invention can effectively utilize the limited space of the vehicle, change the storage waste that requires continuous pressurization when using liquefied natural gas cylinders, the unstable gas supply pressure of the engine, which affects the emptying of the storage tank of the liquefied natural gas filling station, and increases the economy of waste, etc. The current situation solves the contradiction that the pressure, temperature, and flow between the gas supply fuel of the LNG low-temperature storage tank and the engine inlet cannot change with the engine speed, and ensures the safety of the vehicle during transportation and use; the technical design of the present invention is scientific and reasonable, and the structure is simple and ingenious , Easy to install, use and maintain, stable and reliable effect, conducive to popularization and application

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