A pressure differential transmitter

Abstract

The invention relates to the technical field of sensors, and discloses a differential pressure transmitter, which includes a base and a positive pressure isolation diaphragm. The end face of the base and the inner side of the positive pressure isolation diaphragm are provided with a spike filter device, and the spike filter The device comprises a buffer groove, a sealing piston, a buffer spring, a positioning pull rod and a pressure bearing part, and the positioning pull rod pulls and positions the sealing piston in the buffer groove under the pressure elastic force of the buffer spring. In the present invention, a spike filter device is set in the high-pressure chamber of the base, and the initial state of the buffer spring under pressure is set to the displacement limit generated when the positive pressure isolation diaphragm reaches the calibrated pressure value. When the system is subjected to a fluid spike or pulse When acting, the pressure exceeding the threshold will preferentially act on the pressure-bearing parts through the positive pressure isolation diaphragm, driving the sealing piston to compress the buffer spring, and the pressure displacement exceeding the threshold will be buffered by the silicone oil entering the buffer tank, effectively protecting the center pressure sensor The diaphragm and associated capacitors are protected from spikes.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a pressure differential transmitter. Background technique [0002] Transmitters are all sensors that can output standard signals. They work based on the principle of negative feedback. They are mainly composed of measurement parts, amplifiers and feedback parts. They are commonly used detection equipment in process control processes. According to their pressure-signal conversion methods, they can be Divided into: resistance strain gauge pressure transmitter, diffused silicon pressure transmitter, ceramic pressure transmitter, etc. Among them, pressure transmitters that display pressure detection values ​​with capacitance changes are also called differential pressure transmitters. [0003] Such as figure 1 As shown, the central pressure-sensing diaphragm 2 is a measuring diaphragm, also known as a movable electrode, which forms two capacitive plates with the arc-shaped electrode...

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Problems solved by technology

[0005] In view of the deficiencies in the use of the existing differential pressure transmitters proposed in the background technology, the present invention provides a pressure differential pressure transmitter, which has the advantages of fluid spike protection function, and solves the problems raised in the above background technology. The problem

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