Pressure balance system

Abstract

The invention discloses a pressure balance system which comprises a diaphragm type pressure sensor, two pressure transmitting cavities separated from each other are arranged in the diaphragm type pressure sensor, a closed pressure stabilizing box covers the diaphragm type pressure sensor, and a closed cavity is formed between the inner wall of the pressure stabilizing box and the outer wall of the diaphragm type pressure sensor, the outer wall of the diaphragm type pressure sensor is wrapped by the cavity, the cavity forms a pressure stabilizing cavity, a balance flow channel penetrates through the shell of the diaphragm type pressure sensor, and one pressure transmitting cavity is communicated with the pressure stabilizing cavity through the balance flow channel. The diaphragm type pressure sensor has the beneficial effects that through the compact and ingenious structural design, the use of a liquid pressure transmission medium is greatly reduced while the balance of the internal and external pressure of the diaphragm type pressure sensor is ensured, meanwhile, the unbalance of the pressure in the two pressure transmission cavities of the sensor caused by temperature change is remarkably reduced, and the precision of the sensor is improved.

Description

technical field [0001] The invention relates to a pressure measuring device, in particular to a pressure balance system of the pressure measuring device. Background technique [0002] A type of flow meter used to detect fluid flow. The detection principle is to detect the pressure values ​​at two different points on the fluid flow path. Since the pressure values ​​at these two points are different, the fluid flow can be calculated. The main body of this type of flowmeter is a fluid pressure detection device, and the core detection element of the fluid pressure detection device is a diaphragm pressure sensor. The diaphragm pressure sensor converts two pressure signals at different positions of the fluid into the change of the capacitance signal, and then the detection circuit at the back end processes the change of the capacitance signal to obtain the differential pressure value of the applied pressure. [0003] The diaphragm pressure sensor includes two disc-shaped diaphrag...

AI Technical Summary

Problems solved by technology

However, there are still some problems with this structure

First of all, the volume of the pressure stabilizing chamber is large, consumes more silicone oil, increases the cost, and brings challenges to the assembly and sealing between the cover body and the pressure induction seat

In addition, in order to simplify the structure, in the actual design, the pressure stabilizing chamber outside the sensor will be connected with one of the pressure transmitting chambers to ensure that the pressure inside and outside the sensor changes synchronously. As a result, the pressure of the silicon oil in the pressure transmission chamber on the side connected to the pressure stabilization chamber changes significantly on the measuring diaphragm, which affects the accuracy of the sensor

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