Compressed gas precision filter

Abstract

The invention discloses a compressed gas ultrafilter. The ultrafilter comprises a filter seat, a cylindrical shell arranged on the filter seat, a filter element which is arranged on the filter seat and positioned in the cavity of the cylindrical shell, and a drain valve component which is arranged at the lower end of the cylindrical shell; the drain valve component comprises a supporting body arranged on a closed end face, an intermediate body arranged in the hollow passage of the supporting body, and a hollow drain rod which is arranged in a hollow rod-shaped part; a first seal ring is arranged between the supporting body and the cylindrical shell, and the whole supporting body is fastened by a nut; the intermediate body is provided with the hollow rod-shaped part matched with the hollow passage; a closing head is arranged on the top of the hollow drain rod, and a hole communicated with the hollow structure of the drain rod is formed in the drain rod close to the closing head; second seal rings which are peripherally arranged are formed in upper end parts of the closing head and the intermediate body. According to the compressed gas ultrafilter, the working stability of the drain valve can be guaranteed by virtue of the closed structure between the drain valve component and the cylindrical shell, and the closing performance of the filter cannot be influenced by the whole structure; the cylindrical shell is produced by adopting a cold extrusion molding process, so that the manufacture cost for the shell can be greatly reduced while the quality of the shell is guaranteed, and the production efficiency can be greatly improved and increased.

Description

technical field [0001] The invention relates to a precision filter for compressed gas. Background technique [0002] Under the guidance of energy-saving and emission-reduction policies, using natural gas as a fuel substitute can not only improve exhaust emissions but also save vehicle operating costs. [0003] However, when the compressed natural gas containing impurities and moisture enters the pipeline system of the gas engine, it is easy to cause corrosion, wear or blockage of the equipment. Although the primary filtration of the natural gas high-pressure filter can ensure the normal operation of the high and low pressure regulators, it is difficult for the electronic control The nozzles and other high-precision parts of the injection system will still cause damage to varying degrees, until the working stability of the system is affected. [0004] Most compressed gas filter devices have a shell structure for installing filter elements (such as the Chinese utility model p...

AI Technical Summary

Problems solved by technology

However, the existing technical means cannot reach a balance point on the economy of the shell and the reliability of pressure bearing

Moreover, while ensuring the pressure bearing capacity of the shell, the airtightness of the shell is also very important. Taking the Chinese utility model patent with the publication number CN202620906U as an example, the cooperation between the shell prepared by traditional technology and other auxiliary structures It is easy to cause the problem of poor sealing performance, which is a huge safety hazard for the filter device installed on the compressed gas pipeline

Especially the drain valve assembly installed in the shell, since the drain valve is a structure that is used regularly, if the airtight performance between it and the shell cannot be effectively resolved, the safety and working stability of the entire filter device cannot be guaranteed Moreover, the structure of the existing drain valve assembly is relatively complicated, and the installation is relatively inconvenient. The structure of the drain valve installation also directly affects the airtight performance of the entire shell

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