Pressure sensor with double redundancies and high reliability
A pressure sensor, double redundancy technology, applied in the direction of fluid pressure measurement by changing ohmic resistance, can solve the problems of relatively large installation space, single measurement, measurement error, etc., to achieve small volume, small temperature error, frequency response high effect
Inactive Publication Date: 2010-06-02
李维平 +2
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Problems solved by technology
[0002] In the current aircraft, special machines and key control processes, there are many pressure physical quantities measured in the fuel supply system, lubrication system, hydraulic system, and gas compression system; conventional pressure sensors can only perform a single measurement of the system under test
Due to the importance of measurement, safety and reliability requirements, it is usually required to install two pressure sensors at the same pressure point to ensure that when one pressure sensor fails, the other can work normally, because the two sensors exist Due to the difference in performance, and due to the different positions installed in the measurement system, the result will bring systematic errors to the measurement; and the installation space requirement is relatively large; this requires a dual-redundant high-reliability pressure sensor
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[0010] Control attached figure 1 , its structure includes a pressure conversion joint 3, two silicon pressure sensitive cores 5, two silicon pressure sensitive core compensation circuits 8, a fixing bracket 9, four mounting screws 10, two electrical signal amplification processing boards 13, silicon pressure The connection lead 11 between the sensitive core compensation circuit and the electrical signal amplification processing board and the connection lead 15 between the electrical signal amplification processing board and the electrical connector, the stainless steel shell 14, the electrical connector 16, and the inner potting silicone 17; Between the two silicon pressure sensitive cores 5 and the pressure conversion joint 3, they are fastened by threads and then welded into a whole through the connecting weld 7. The two silicon pressure sensitive core compensation circuits 8 are respectively connected to the two silicon pressure sensitive cores. On the core body 5, the fixe...
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The invention relates to a pressure sensor with double redundancies and high reliability, which comprises a pressure conversion joint, two silicon pressure sensitive cores, two compensation circuits of the silicon pressure sensitive cores, two electric signal amplification processing boards, a stainless steel shell, an electric connector and potting silica gel, wherein the two silicon pressure sensitive cores are welded in the pressure conversion joint; the two compensation circuits of the silicon pressure sensitive cores are respectively connected with the two silicon pressure sensitive cores through connecting cables; the two electric signal amplification processing boards are respectively connected with output signals of the two compensation circuits of the silicon pressure sensitive cores; processing signals of the electric signal amplification processing boards are transmitted out from the aerial electric connector through the output ends of the circuits; the pressure conversion joint, the stainless steel shell and the aerial electric connector are welded into a whole body; and the silica gel is potted in the whole body. The invention has the advantages of small volume, light weight, full stainless steel watertight structure, pressure resistance, salt mist prevention, electromagnetic interference resistance, overpressure impact resistance, high frequency response, high comprehensive precision, small temperature error and the like.
Description
technical field [0001] The invention relates to a double-redundancy high-reliability pressure sensor for measuring the fluid pressure of aircraft and special machine oil supply system, lubrication system, hydraulic system, gas compression system, etc. The measurement medium is gas, hydraulic oil and other fluids, which belongs to the pressure sensor technology field. Background technique [0002] In the current aircraft, special machines and key control processes, there are many pressure physical quantities measured in the fuel supply system, lubrication system, hydraulic system, and gas compression system; conventional pressure sensors can only perform a single measurement of the system under test. Due to the importance of measurement, safety and reliability requirements, it is usually required to install two pressure sensors at the same pressure point to ensure that when one pressure sensor fails, the other can work normally, because the two sensors exist Due to the diffe...
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IPC IPC(8): G01L9/06
Inventor 李维平黄标佘德群
Owner 李维平
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