Floating film box suitable for micro-differential pressure transmitter

Abstract

The invention relates to the technical field of differential pressure transmitter and particularly discloses a floating film box suitable for a micro-differential pressure transmitter. The floating film box comprises a sensor part, a cup body part and body part, wherein the cup body part is welded together with the body part and comprises a cup body, the cup body is welded together with the sensorpart, and an annular cavity is formed in the cup body part along the periphery of the sensor part; the body part comprises an isolation diaphragm and a body, the isolation diaphragm is welded together with the outer surface of the body and is welded together with the positive pressure side end surface and a negative pressure side end surface of the body so as to form two symmetric chambers; and two symmetric flow guiding holes are formed in the body, one end of each flow guiding hole is connected with the annular cavity, the other end of each flow guiding hole is connected with the chambers,and filling liquid is introduced into the chambers, the annular cavity and the flow guiding holes. The floating film box provided by the invention is suitable for the micro-differential pressure transmitter.

Description

technical field [0001] The invention relates to the technical field of differential pressure transmitters, in particular to a floating bellows suitable for differential pressure transmitters. Background technique [0002] Capacitive differential pressure transmitters have been widely used in various industrial fields, but there is no reliable solution for accurate measurement of micro-differential pressure in the prior art. Such as figure 1 As shown, it is the existing floating bellows structure. The differential pressure transmitter is composed of a detection part and a conversion part. The detection part includes a sensor part 20, a cup body part 30, a body part 40, a cup body 31, an isolation diaphragm 41, It is composed of filling liquid 11, body 42, protective diaphragm 44, etc. The combination of all metal parts adopts a fully welded integrated structure. As a medium for pressure transmission, the bellows is filled with filling liquid, and the filling liquid fills b...

AI Technical Summary

Problems solved by technology

[0005] However, the structural design of this kind of differential pressure transmitter with floating bellows structure is complex and difficult to manufacture, especially when used for micro-differential pressure transmitters. Due to the small measurement range (0.1~1kPa), any tiny Changes and disturbances can have a significant adverse effect on product performance, and such changes and disturbances are difficult to control during the manufacturing process

These influencing factors lead to poor temperature characteristics of the product, poor repeatability and stability, high dispersion of static pressure and one-way static pressure, and long-term stability degradation, which directly affect the normal operation of the product.

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