A kind of end face sealing lng filling port with positioning structure

Abstract

The invention discloses an end face sealed LNG (liquefied natural gas) filling port with a positioning structure. The end face sealed LNG filling port comprises a valve body, a valve core, an end cap and a spring, the valve core is arranged in a hollow cavity of the valve body, the end cap is connected with the end of the valve body, and the spring is arranged between the valve core and the end cap. A centre is arranged between the valve core and the spring, one end of the centre is connected with the spring, the other end of the centre is provided with a tip, and the end face of the valve core is provided with a recess portion fitting the tip portion in shape. By precision positioning of the valve core through the tip of the centre, accumulated tolerance generated after combination of parts is overcome; since an elastic force of the spring is applied to the center point of the valve core through the centre, valve core stress unbalance caused by positional deviation of the valve core and spring deformation or shaking can be prevented, and deflection or inclination of the valve core relative to the valve body is avoided to guarantee constant favorable contact of seal surfaces of the valve core and the valve body.

Description

technical field [0001] The invention relates to the technical field of an LNG filling port, in particular to an end face sealed LNG filling port with a positioning structure. Background technique [0002] The LNG filling port is mainly used for the filling of ultra-low temperature liquid in storage tanks of LNG vehicles, ships, etc., including industrial gases such as LNG and liquid nitrogen. [0003] The existing filling ports in the market are technically derived from JC Carter and Macro (now a sub-brand of ECI) in the United States. Almost all of them adopt radial sealing. The sealing structure and the design of the seal are almost exactly the same, and they are all radial sliding seals. , using springs with PTFE or PCTFE seals, the size of the seals is almost the same, only the appearance of the filling port is slightly different. A liquefied natural gas (LNG) filling port disclosed by Macro (Mark Technology Co., Ltd.), such as figure 1 As shown, the seal 101 is arrang...

AI Technical Summary

Problems solved by technology

This structure solves the problem of scratches and damages on the sealing surface, but this sealing method lacks a positioning guarantee structure, and the compression spring 203 is prone to inclination and shaking, which will cause the deviation and inclination of the valve core, and the pressure applied to the valve core The distribution of the spring force is uneven, and the direction of the spring force is skewed to the axis of the valve body, resulting in the relative inclination of the annular seal 202 on the valve core and the sealing surface 201 of the valve body, so that the sealing belt cannot be overlapped and leakage occurs

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