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Wide-range pressure measurement diaphragm capsule

A wide range and pressure technology, applied in the field of wide range pressure measurement bellows, can solve the problems of low precision, low measurement range value, high measurement accuracy, etc., and achieve the effect of improving the range ratio and taking into account the measurement accuracy

Pending Publication Date: 2022-04-29
CHONGQING WECAN PRECISION INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, it is difficult to balance the measurement range value and measurement accuracy. The relative accuracy of the diaphragm differential pressure sensor with a high measurement range value is low, and when the relative accuracy of the diaphragm type differential pressure sensor is high, the measurement range value is low.
However, some application scenarios require a large width of the measurement range and high measurement accuracy

Method used

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  • Wide-range pressure measurement diaphragm capsule
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  • Wide-range pressure measurement diaphragm capsule

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Such as figure 1 As shown, a wide-range pressure measurement bellows includes two or more capacitive differential pressure sensor modules 100 and two pressure conduction channels, the measurement range of each of the differential pressure sensor modules 100 increases sequentially, and the measurement The measurement ranges of two differential pressure sensor modules 100 with adjacent ranges partially overlap, so as to obtain continuous ranges.

[0044] Such as figure 2 The differential pressure sensor module 100 is provided with two sealed sensing cavities 130 separated by a diaphragm 120 , and each of the sensing cavities 130 is respectively connected with a pressure introduction tube 160 . The two pressure introduction tubes 160 of each differential pressure sensor module 100 correspond to the two pressure conduction channels respectively, and all the pressure introduction tubes 160 corresponding to the same pressure conduction channel correspond to the same pressur...

Embodiment 2

[0059] Such as figure 1 , 3 , 4 and 8, a pressure measurement device includes the pressure measurement bellows as in Embodiment 1, and the pressure measurement bellows includes two cylindrical differential pressure sensor modules 100 . A pressure introduction seat 200 is arranged under the two differential pressure sensor modules 100, and a boss is arranged on the pressure introduction seat 200, and the two differential pressure sensor modules 100 are arranged side by side above the boss.

[0060] combine Figure 4~6 It can be seen that the pressure induction seat 200 is provided with a pressure introduction channel 210 corresponding to the two pressure introduction tubes 160 respectively, and the upper ends of the two pressure introduction channels 210 are opened on the upper surface of the boss of the pressure introduction seat 200 The lower ends of the two pressure introduction channels 210 are respectively opened on a pair of opposite side walls of the pressure introduct...

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Abstract

The invention discloses a wide-range pressure measurement diaphragm capsule, which comprises two or more capacitive differential pressure sensor modules and two pressure conduction channels, the measurement ranges of the differential pressure sensor modules are sequentially increased, and the measurement ranges of two differential pressure sensor modules with adjacent measurement ranges are partially overlapped, so that a continuous range is obtained. The differential pressure sensor module is internally provided with two sealed induction cavities formed by separation of a diaphragm, each induction cavity is connected with a pressure guiding pipe, the two pressure guiding pipes of each differential pressure sensor module are in one-to-one correspondence with the two pressure conduction channels and are communicated with the two pressure conduction channels, and the differential pressure sensor module has an overload protection function. The beneficial effects of the invention are that the measuring range ratio is greatly improved, and the measurement precision is considered at the same time.

Description

technical field [0001] The invention relates to a pressure measuring device, in particular to a wide range pressure measuring bellows. Background technique [0002] Pressure transmitters are widely used in fluid pressure and flow measurement devices. The core detection element of a type of pressure transmitter is a diaphragm differential pressure sensor. The diaphragm differential pressure sensor converts two pressure signals at different positions of the fluid into changes in the capacitance signal, and then the detection circuit at the back end processes the change in the capacitance signal to obtain the differential pressure value of the applied pressure. [0003] The diaphragm differential pressure sensor includes two disc-shaped diaphragm seats, a measuring diaphragm is arranged between the two diaphragm seats, and the two diaphragm seats are connected by butt welding to clamp the measuring diaphragm. Between the measuring diaphragm and the two diaphragm seats are res...

Claims

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Application Information

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IPC IPC(8): G01L7/10G01L13/02G01L13/06
CPCG01L7/102G01L13/028G01L13/06
Inventor 杨劲松刘庆王小文朱健何炳伟金亮
Owner CHONGQING WECAN PRECISION INSTR
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