Novel quick coupling device for pressure gauge

Abstract

The invention relates to an improvement on a connecting joint device and particularly relates to a novel quick coupling device for a pressure gauge, the clamping action, the sealing action, the pressure supply action and the dismounting action of the pressure gauge can be achieved through on-off control over a calibration gas circuit, a clamping and loosening driving gas circuit and a sealing gascircuit, that pressure can be stably supplied while the pressure gauge is clamped is guaranteed, and dismounting is convenient. The device comprises an outer sleeve (1), a clamping jaw (2), a sealingring movable sleeve (3), a floating inner pipe (4), a tensioning sleeve (5), a sealing pressure-bearing sleeve (6) and a base (8), wherein the floating inner pipe (4) is arranged in the tensioning sleeve (5) and is in sliding fit with the tensioning sleeve (5), the sealing ring movable sleeve (3) is arranged at the top of the floating inner pipe (4), the clamping jaw (2) is arranged on an upper portion of the tensioning sleeve (5), the sealing pressure-bearing sleeve is arranged on a lower portion of the tensioning sleeve, and the tensioning sleeve can be in rotating fit with the clamping jaw.

Description

technical field [0001] The invention relates to an improvement to a connecting joint device, in particular to a novel quick joint device for a pressure gauge. Background technique [0002] A pressure gauge is an instrument that uses elastic elements as sensitive elements to measure and indicate pressure higher than the environment. It is widely used, and it pervades almost all industrial processes and scientific research fields. It can be seen everywhere in the fields of heat pipe network, oil and gas transmission, water supply and gas supply system, vehicle maintenance shop, industrial process control and technical measurement. Especially in the occasions where the pressure gauge needs to be clamped frequently on the pressure gauge verification device, due to the high mechanical strength and convenient production of the elastic sensitive element of the mechanical and digital display pressure gauge, the mechanical and digital display pressure gauge be more and more widely u...

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned structure has a major problem in the actual use process. When the quick joint is connected to the pressure gauge, when the pressure gauge is fed with high-pressure and low-pressure media, the tightness between the quick joint and the pressure gauge is poor, and the pressure gauge may even appear from the pressure gauge at high pressure. The specific reasons for the detachment of the quick connector are as follows:

[0006] The opening of the claw is to drive the ejector rod by pushing the fulcrum, and further push the tension sleeve to move upward, thereby pushing the claw to open. When the pressure gauge is installed, the seal is through the contact between the pressure gauge and the movable sleeve of the sealing ring, and through the return spring. Pull the sealing pressure-bearing sleeve, and further drive the tensioning sleeve to further tighten the jaws through the sealing pressure-bearing sleeve, but in the actual use process, when the pressure gauge is connected to a large pressure, it is difficult to keep the jaws downward through the elastic force of the return spring. Therefore, the locking action of the pressure gauge cannot be realized, resulting in that the pressure gauge and the movable sleeve of the sealing ring cannot be pressed tightly. It can be said that it is more difficult to compress, so it often leads to frequent leakage

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