A large overload and high precision strain gauge pressure sensor
A pressure sensor, high-precision technology, applied in the field of medium pressure measurement, large overload and high-precision strain-type pressure sensor, to achieve the effect of improving overload capacity, high reliability, and enhancing anti-vibration
Active Publication Date: 2020-06-09
XIAN AEROSPACE PROPULSION INST
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Problems solved by technology
[0003] The purpose of the present invention is to solve the pressure measurement of the normal temperature pipeline of the existing liquid oxygen kerosene engine, which needs to meet the high-precision measurement requirements of large overload, vibration resistance, impact resistance and complex electromagnetic environment conditions, and provide a large overload high-precision strain type pressure sensor
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[0023] Below in conjunction with accompanying drawing and specific embodiment the content of the present invention is described in further detail:
[0024] Such as Figure 1 to Figure 4 The large-overload high-precision strain gauge pressure sensor shown includes a sensitive element 1, a shielding assembly 2, a nozzle 3, a casing nut 4, a housing 5, a cable 6, an electrical connector 7, silicone rubber 8 and epoxy glue 9; Epoxy glue 9, silicone rubber 8 and sensitive element 1 are sequentially arranged inside the housing 5; the sensitive element 1 includes an elastic diaphragm 11, a strain gauge 12 and a compensation circuit printed board 13, and the elastic diaphragm 11 is a variable-thickness diaphragm. The upper surface of the elastic diaphragm 11 is provided with an upper groove, and the lower surface is provided with a lower groove. The bottom surface of the upper groove is a plane, and the bottom surface of the lower groove is a smooth transition surface. The radial str...
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The present invention relates to a high-overload and high-precision strain pressure sensor. The objective of the invention is to solve the problem that a current liquid oxygen kerosine engine normal temperature pipeline pressure measurement needs to meet high overload, vibration resistance, impact resistance and high-precision measurement requirement in a complex electromagnetic environment condition. The sensor comprises a sensitive element, a shielding module, a filler neck, a housing, a cable, an electrical connector, silicone rubber and epoxy glue. The epoxy glue, the silicone rubber and the sensitive element are arranged in the housing; the sensitive element comprises an elastic membrance, a strain gage and a compensating circuit printed board, the upper surface of the elastic membrance is provided with an upper groove, the lower surface of the elastic membrance is provided with a lower groove, the strain gage is pasted at the bottom surface of the upper groove of the elastic membrance, a strain gage is in lead connection with the compensating circuit printed board, the compensating circuit printed board is connected with the cable, and the cable passes through the silicone rubber, the epoxy glue, the shielding module and the electrical connector in order; and the shielding module is arranged at the connection position of the housing and the cable, and comprises a cable fixing seat and a shielding layer, and the filler neck is fixedly arranged at one side of the housing.
Description
technical field [0001] The invention relates to the field of pressure sensors, in particular to a large overload and high precision strain type pressure sensor, which can be used for pressure measurement of liquid oxygen kerosene engine normal temperature pipelines under large overload, large impact and complex electromagnetic environment, and can also be applied to general environments Medium pressure measurement under conditions. Background technique [0002] Sensor technology runs through the entire process of liquid rocket engine development, and high-precision, high-stability, and high-reliability sensors are important guarantees for the development of liquid rocket engines. With the development of a new generation of liquid oxygen kerosene engines and heavy-duty engines, the application of high thrust and clean propellants not only increases the measurement range of the sensor, but also makes the working environment worse. At the same time, the sensor needs to withstan...
Claims
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Login to View More IPC IPC(8): G01L7/08G01L9/04
CPCG01L7/08G01L9/04
Inventor 李伟冯图徐中节乔智霞张爱文王彩红李辉
Owner XIAN AEROSPACE PROPULSION INST