A natural gas filling tank

Abstract

The invention discloses a natural gas filling tank. The natural gas filling tank comprises a shell with an inner cavity. The shell is internally provided with a piston plate in a sliding manner. A first valve group and a second valve group communicate with an empty tank part. A third valve group and a fourth valve group communicate with a filling part. The piston plate is provided with a pluralityof grooves at intervals. Each groove is internally provided with an elastic sealing block. A switch valve comprises a valve body pipeline communicating with the shell and a baffle covering an external end opening of the valve body pipeline, and a tension spring is fixedly connected between the valve body pipeline and the baffle. The valve body pipeline is internally and rotationally provided witha valve body rotating ball. The inner side of the baffle is fixedly connected with an ejector rod. According to the natural gas filling tank, the pressure stability of natural gas of the filling partis achieved, a multi-level sealing structure between the piston plate and the shell is formed through the multiple elastic sealing blocks, the empty tank part and the filling part are subjected to sealing isolation, the purity of the gas is guaranteed, meanwhile, by means of the grooves, lubricating liquid is conveniently stored, the abrasion of the piston plate is slowed down, and the service life of the filling tank is greatly prolonged.

Description

technical field [0001] The invention relates to natural gas filling equipment, in particular to a natural gas filling tank. Background technique [0002] Natural gas is recognized as the cleanest energy on earth, and it has gradually replaced coal as household energy. The natural gas filling tanks currently used in the market usually use suction pumps for filling when the pressure in the tank is insufficient. As the natural gas decreases, the suction pump will make it difficult to discharge the remaining natural gas, and the power of the suction pump will increase. Therefore, it is very necessary to design a new natural gas filling tank. [0003] Moreover, the study also found that a large number of link structures are distributed on the surface of earthworms. During the movement of earthworms in the soil, the link structures expand and form a multi-level sealing structure with the soil to support the forward movement of the earthworm body segments. At the same time, the gr...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the reduction of natural gas in the existing natural gas filling tank will cause difficulty in discharging the remaining natural gas, unstable pressure and poor sealing performance

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