Micro differential pressure transmitter

Abstract

The invention relates to a micro differential pressure transmitter which comprises a hollow shell, sleeves are arranged on the opposite inner side walls of the shell, the axes of the opposite sleeves coincide, a gap is formed between the ends close to each other, and the distance of the gap can be adjusted; a balance diaphragm which is arranged at the gap; and a balance spring which is partially arranged in the sleeve, and the part, exposed out of the sleeve, of the balance spring is connected with the balance diaphragm. The balance spring is arranged in the sleeve, the sleeve can support the balance spring, when the balance diaphragm is impacted by gas, the sleeve can reduce the swing range of the balance diaphragm by limiting the movement range of the balance spring, swing of the balance diaphragm can be reduced, and the measurement precision is improved. Meanwhile, the situation that the balance diaphragm is damaged due to the too large swing amplitude can be reduced, the gap between the opposite sleeves can be adjusted, the sleeves can adjust the movement range of the balance diaphragm, and then the pressure measuring range is adjusted.

Description

technical field [0001] The present application relates to the field of transmitters, in particular to a differential pressure transmitter. Background technique [0002] The differential pressure transmitter is an important means of measuring the liquid level. It is usually used to measure the liquid level of liquids such as tank-type liquefied natural gas, liquid hydrogen, and liquid oxygen. The current differential pressure transmitter has a balance diaphragm and The balance spring used to stabilize the balance diaphragm. In order to achieve better measurement results, the balance spring is in a natural state. During the actual measurement process, the balance diaphragm is displaced due to the different air pressure on both sides, but because the spring is completely in the In the natural state, this will cause the displacement of the balance diaphragm not only to move left and right, but also to move up and down, which will easily pull the balance diaphragm, making the bal...

AI Technical Summary

Problems solved by technology

[0002] The differential pressure transmitter is an important means of measuring the liquid level. It is usually used to measure the liquid level of liquids such as tank-type liquefied natural gas, liquid hydrogen, and liquid oxygen. The current differential pressure transmitter has a balance diaphragm and The balance spring used to stabilize the balance diaphragm. In order to achieve better measurement results, the balance spring is in a natural state. During the actual measurement process, the balance diaphragm is displaced due to the different air pressure on both sides, but because the spring is completely in the In the natural state, this will cause the displacement of the balance diaphragm not only to move left and right, but also to move up and down, which will easily pull the balance diaphragm, making the balance diaphragm tilt under the action of pressure, or move with the gas The impact randomly swings, and even causes damage to the balance diaphragm, and the instability and shaking of the balance diaphragm will lead to inaccurate measurement results

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