Differential pressure sensor for switching value

Abstract

The invention relates to a differential pressure sensor for a switching value. The differential pressure sensor comprises a shell body and a signal control unit, wherein an inner cavity of the shell body is provided with a high-pressure chamber and a low-pressure chamber, a first pressure sensing film is arranged in the high-pressure chamber, a second pressure sensing film is arranged in the low-pressure chamber, a connecting rod is arranged between the first pressure sensing film and the second pressure sensing film, two ends of the connecting rod are adhered on the first pressure sensing film and the second pressure sensing film, a pressure value adjusting knob is arranged at one end of the connecting rod, the signal control unit is arranged in an electrical chamber of the shell body, and comprises a sensing microswitch which is connected with a circuit function module, and the circuit function module is connected with a central processor (ECU) through a trigger circuit. The differential pressure sensor can be used for accurately acquiring a pressure drop of a fluid passageway component, outputting a reliable, simple and manageable signal, and driving an indicator lamp or transferring a signal to the central process (ECU) by only outputting an indication signal at a certain point, so that the signal is stable and simple, and cannot be affected by a severe environment.

Description

technical field [0001] The invention belongs to an early warning device used for early warning that the pressure difference of each component in a fluid passage exceeds a threshold, especially a design of a pressure difference early warning sensor for each component of a low-pressure oil circuit or a gas circuit. It can warn the components in the fluid passage, and the pressure drop of the components exceeds the threshold due to the accumulation or blockage of impurities, especially suitable for the life warning of oil circuit components in the automotive industry. The output signal adopts the on-off signal and level signal that are convenient for the host computer or ECU to detect. Background technique [0002] Commonly used differential pressure sensors are also called differential pressure transmitters, mainly including capacitive differential pressure transmitters, ceramic differential pressure sensors, and diffused silicon differential pressure sensors. [0003] Capaci...

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Problems solved by technology

Potassium sodium tartrate has great piezoelectric sensitivity and piezoelectric coefficient, but it can only be applied in an environment with low room temperature and humidity.

[0007] The above are the well-known differential pressure sensors in the prior art. These sensors are all analog output. Generally, AD collection and secondary development are required to indicate business trips. Pressure value, and because of its manufacturing process, its price remains high; at the same time, this type of sensor is easily affected by temperature, and cannot meet the requirements of some industries

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