Absolute pressure packaging structure of strain type pressure sensor

Abstract

The invention belongs to the technical field of pressure sensors, and particularly relates to an absolute pressure packaging structure of a strain type pressure sensor. The structure comprises a base,a housing, an elastomer diaphragm, a lead plate and an assembling mechanism for assembling the elastomer diaphragm and the lead plate, the housing is connected to the bottom of the base in a threadedmanner, the connecting end of the housing and the connecting end of the base are sealed through an O-shaped sealing ring, a pressure sensing channel is formed in the middle of the base, and the assembling mechanism is composed of an assembling plate, a pressing ring, a cover plate and a locking bolt. Both the housing and the assembling mechanism adopt detachable mounting structures, so that the assembly process is simpler and more convenient, the manufacturing cost of a sensor is effectively reduced, the maintenance and replacement of components are facilitated, and the use is convenient; andthe elastomer diaphragm and the lead plate are assembled in a unified manner by utilizing the assembling mechanism, the structure has the characteristics of simple and compact structure, high stability, strong practicability and wide application range, the sealing performance in the sensor is ensured, and the requirement of high-reliability absolute pressure measurement is met.

Description

technical field [0001] The invention relates to the technical field of pressure sensors, in particular to an absolute pressure packaging structure of a strain gauge pressure sensor. Background technique [0002] The most widely used strain gauges are adhesive strain gauges (ie, strain gauges). Its main disadvantages are small output signal, narrow linear range, and poor dynamic response (see resistance strain gauge, semiconductor strain gauge). However, due to the small size of the strain gauge, commercial strain gauges have a variety of specifications to choose from, and the form of elastic sensitive elements can be flexibly designed to suit various applications, so strain gauge pressure sensors made of strain gauges are still widely used. Applications. According to the different structures of elastic sensitive elements, strain gauge pressure sensors can be roughly divided into four types: strain tube type, diaphragm type, strain beam type, and combined type. [0003] Th...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides an absolute pressure packaging structure of a strain gauge pressure sensor, which solves the problem that although the existing absolute pressure packaging structure can measure absolute pressure effectively and reliably, it generally has poor structural rationality. The problem is that the packaging structure adopts the connection method of electron beam welding or laser welding, and the assembly process is complicated, which increases the manufacturing cost of the sensor, is not easy to maintain and replace, and causes inconvenience in use.

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