Pressure sensor

Abstract

The invention relates to the technical field of sensors and particularly discloses a pressure sensor. The pressure sensor comprises a pressure core body and a sensor base, wherein the pressure core body and the sensor base form a pressure cavity; the sensor base is provided with a pressure inlet communicated with the pressure cavity; and the tested system pressure is communicated with the pressure inlet. The pressure sensor also comprises a pressure protector, the pressure protector is arranged at the pressure inlet; and when the tested system pressure is greater than a preset value, the pressure protector closes the pressure inlet. In the pressure sensor provided by the invention, the pressure protector is arranged at the pressure inlet of the pressure cavity, and when the tested system pressure is greater than the preset value, the pressure protector closes the pressure inlet, so that the test system pressure cannot enter into the pressure cavity, thus the pressure core body is effective protected; and the pressure sensor has the advantages of better durability, better reliability and loner service life.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a pressure sensor with a pressure protection function. Background technique [0002] A pressure sensor is a sensor that can be used to detect liquid or gas pressure. It has the advantages of high measurement accuracy, high stability, corrosion resistance, wear resistance, impact resistance, etc., and is widely used in various industrial controls. [0003] Please see figure 1 , figure 1 It is a structural schematic diagram of a typical pressure sensor in the prior art. [0004] Such as figure 1 As shown, the pressure sensor includes a sensor seat 1, a sealing ring 2, a pressure core 3, an isolation ring 4, a retaining spring 5, a housing assembly 6, a wire harness 7, etc., and the pressure core 3 is made of ceramic materials, and it is provided with The pressure element, the pressure core 3 and the sensor base 1 form a pressure cavity, and the sensor base 1 is provided with a ...

AI Technical Summary

Problems solved by technology

[0005] The maximum pressure that the pressure core 3 made of ceramic material can withstand is the failure pressure. The failure pressure of the pressure core 3 in the prior art can only reach 3 times of the specification value. When the system under test produces an abnormality, the pressure It may exceed 3 times or even higher than the specification value, which will cause the pressure core 3 to rupture and be damaged, thus making the pressure sensor scrapped and unable to continue to use

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