Natural gas hydraulic compression cylinder

Abstract

A natural gas hydraulic compression cylinder comprises a compression cylinder shell. A gas inlet and outlet opening is formed in the upper end of the compression cylinder shell, and a liquid inlet and outlet opening is formed in the lower end of the compression cylinder shell. An inner cavity of the compression cylinder shell is in sliding fit with a vertically-moving movable separation plate used for isolating a gas medium from a liquid medium. The inner cavity of the compression cylinder shell is divided by the movable separation plate into a gas compression cavity and a liquid expansion cavity. The volume of the gas compression cavity and the volume of the liquid expansion cavity relatively change along with vertical movement of the movable separation plate. When hydraulic oil injected in the compression cylinder compresses natural gas, the two media are not in contact, the phenomenon that the oil and the gas are mixed is avoided, the purity of the compressed natural gas can be improved, environment pollution can be avoided, and the safety of the work environment is improved.

Description

technical field [0001] The invention relates to a natural gas compression device, in particular to a natural gas hydraulic compression cylinder. Background technique [0002] At present, natural gas compression devices used in natural gas filling stations are roughly divided into three types: [0003] One is the crank-connecting rod piston compressor, which is driven by a motor to drive the crank-connecting rod mechanism to drive the piston rod to reciprocate in the cylinder, so that the volume of the cylinder changes back and forth continuously to compress the natural gas. In the design, in order to meet the rated compression displacement, motor starting torque and continuous work requirements, the volume of the cylinder is not large, and staged compression is required to save kinetic energy. However, the ratio of the compressed exhaust volume for one reciprocating movement of the piston mechanism to the required output exhaust volume is quite different. Therefore, the cr...

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Problems solved by technology

However, in the natural gas compression device with this structure, since the natural gas will generate compression heat during the compression process, the temperature inside the device will increase, which will lead to intensified molecular activities of the two media, causing some gas molecules and oil molecules to mix, resulting in some oil molecules. As the compressed natural gas enters the compressed natural gas pipeline, it is added to the car, which affects the performance of the car engine; while part of the gas molecules are discharged back to the oil tank at normal pressure with the hydraulic oil, and are released into the atmosphere due to the pressure being eliminated, causing environmental pollution and retention. Lower safety hazards, but also lead to increased losses of natural gas

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