A liquefied natural gas cylinder for vehicles and its valve protection device

Abstract

The invention relates to a liquefied natural gas cylinder and a valve protection device thereof, in particular to a valve protection device of a liquefied natural gas cylinder for vehicles. At least one end of the air cylinder is provided with a valve. An air cylinder protection device is located at the end, with the valve, of the air cylinder. The air cylinder protection device comprises a metal protection ring, a protection ring cover plate and a hand wheel cover plate. The valve protection device is characterized in that one end of the metal protection ring is fixedly connected with a front seal of the air cylinder; the metal protection ring surrounds the valve of the air cylinder; the protection ring cover plate is detachably mounted at the other end of the metal protection ring; the protection ring cover plate shields the valve of the air cylinder; the protection ring cover plate is provided with at least one through hole; the hand wheel cover plate is rotationally mounted on the protection ring cover plate through a positioning mechanism and can shield the through hole selectively; and the positioning mechanism can position the hand wheel cover plate at any angle.

Description

technical field [0001] The invention relates to a gas cylinder valve protection device, in particular to a liquefied natural gas cylinder for vehicles and a valve protection device thereof. Background technique [0002] At present, for vehicles that use liquefied natural gas (LNG) as fuel, especially for truck gas cylinder gas supply systems, the gas cylinders are installed on the side or above the gas cylinder beams with brackets. Since the valve ends of the gas cylinders are exposed, valve protection is required for protection. [0003] Existing valve protection devices are made of metal materials, which are heavy and difficult to install, operate and maintain. Valve protection devices are generally made of metal materials for welding, with poor appearance and high cost. Due to the opaque metal color of the valve protection device in the prior art, the pressure gauge and other components are not easy to observe. For example, the valve protection device involved in the pate...

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Problems solved by technology

[0003] Existing valve protection devices are made of metal materials, which are heavy and difficult to install, operate and maintain. Valve protection devices are generally made of metal materials for welding, which has poor appearance and high cost

Due to the opaque metal color of the valve protection device in the prior art, the pressure gauge and other components are not easy to observe. For example, the valve protection device involved in the patent No. 201210497037.0, the valve protection structure at the front end of the gas cylinder is made of metal as a whole, which is heavy and difficult to install. Large, metal color is not easy to observe the operation status of valves and instruments, and there is no protection for parts such as air filling seat and return air seat

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