Pressure sensor with overpressure protective device

The technology of an overpressure protection device and a pressure sensor is applied in the measurement device, elastic deformation meter type fluid pressure measurement, measurement of fluid pressure and other directions, which can solve the problems of difficulty in mass production, etc. Damage, make simple effects

Inactive Publication Date: 2013-10-23
安徽皖科电子工程有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ring-shaped overvoltage protection diaphragm structure requires multi-section processing, which is difficult and difficult to produce in batches, and the transmission medium in the protection space is not easy to be completely discharged after the pressure is overloaded, which affects the zero point accuracy of the sensor.

Method used

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  • Pressure sensor with overpressure protective device
  • Pressure sensor with overpressure protective device

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Embodiment Construction

[0019] see Figure 1 ~ Figure 3 , the pressure sensor with an overvoltage protection device includes a base 6, a sensor cavity 2 is arranged in the base 6, a pressure sensitive diaphragm 4 is arranged in the sensor cavity 2, and the sensor cavity 2 is filled with There is silicone oil 5; the base 6 is provided with an isolation diaphragm 1 that transmits pressure to the silicone oil 5 in the sensor cavity 2 by generating displacement; the base 6 is also provided with an overpressure protection device 3 The overpressure protection device 3 includes a pressure-holding chamber 301 communicated with the sensor cavity 2, and the pressure-holding chamber 301 communicates with the sensor cavity 2 through a transition cavity 305; A piston 302 is arranged in the pressure chamber 301, and a piston rod 304 on the piston 302 is located in the transition chamber 305; the cross-sectional area of ​​the piston rod 304 is smaller than that of the piston 302; A high-pressure gas is provided in...

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Abstract

The invention discloses a pressure sensor with an overpressure protective device. A sensor cavity is formed in a base, and a pressure sensitive film and silicon oil are arranged in the sensor cavity; an isolating film is arranged below the base; the overpressure protective device is further arranged in the base and comprises a pressure retaining cavity which is communicated with the sensor cavity by a transitional cavity; a piston is arranged in the pressure retaining cavity; a piston rod on the piston is arranged in the transitional cavity; the cross section area of the piston rod is smaller than that of the piston; high-pressure gas is arranged in the pressure retaining cavity; the pressure of the high-pressure gas is more than twice the full-range pressure of the sensor. The pressure sensor with the overpressure protective device disclosed by the invention has the advantages of being capable of realizing the safety protection of the sensitive film of the pressure sensor and preventing the sensor from being damaged due to overload, simple to manufacture, capable of lowering the manufacturing cost of the sensor and the like.

Description

technical field [0001] The invention relates to a pressure sensor, in particular to a pressure sensor with an overpressure protection device which is suitable for occasions where the pressure fluctuates and is easy to be blocked, and large pressure is required to clear the blockage. Background technique [0002] A conventional single-cavity isolation diaphragm oil-filled pressure sensor consists of a sensor isolation diaphragm, a medium silicone oil, a chamber, a pressure sensitive diaphragm and a sensor base. The pressure acts on the isolation diaphragm of the sensor, and the measured pressure is transmitted to the pressure sensitive diaphragm through the medium silicone oil, and the displacement and deformation of the sensitive diaphragm generate a signal corresponding to the measured pressure. Due to the normal single-cavity isolation diaphragm oil-filled pressure sensor, the general overload capacity is 5 to 10 times the full scale of the sensor, especially the pressure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L19/06G01L7/08
Inventor 陈锦荣张从江査俊
Owner 安徽皖科电子工程有限公司
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