Airflow turning protection structure for gauge pressure sensor

Abstract

The invention relates to the technical field of pressure sensors, and discloses an airflow turning protection structure for a gauge pressure sensor. The protection structure comprises a gauge pressuresensor module, and a protection part is arranged at the upper end of the gauge pressure sensor module. According to the invention, a turning airflow channel communicated with a protection cavity is formed between an upper cover and a dustproof cap and is matched with the protection cavity for use; a gas flow channel and a main gas flow channel on the side wall of the turning airflow channel enable gas to be turned to enter the protection cavity; when the pressure balance is achieved, impurities such as external large-particle dust and liquid cannot enter the airflow channel under the action of gravity; and even if part of light impurities can enter the airflow channel and are attached to the side wall of the airflow channel in the turning process, the airflow channel with the side walls arranged in the circumferential array mode can ensure good airflow passing performance, large-particle impurities are isolated while pressure balance is kept, and therefore the purpose of combined action of pressure balance and a protection structure is achieved.

Description

technical field [0001] The invention relates to the technical field of pressure sensors, in particular to a protective structure for changing the direction of airflow used in gauge pressure sensors. Background technique [0002] Pressure sensors are divided into two types: absolute pressure and gauge pressure. The absolute pressure sensor senses the difference between pressure and a fixed reference pressure; the gauge pressure sensor senses the difference between pressure and ambient pressure. Since the ambient pressure value is affected by temperature, humidity, altitude Influenced by other factors, the reference pressure values ​​in different environments are different. In order to ensure the output accuracy of gauge pressure sensors, it is necessary to ensure that the ambient pressure is balanced with the internal pressure of the sensor. [0003] In the prior art, while the internal pressure of the gauge pressure sensor is in balance with the ambient pressure, the harsh a...

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a protective structure for changing the direction of airflow for gauge pressure sensors, which has the advantages of pressure balance and protective structure acting together, and solves the internal pressure and environmental problems of gauge pressure sensors in the prior art. While the pressure balance is connected, the harsh atmospheric environment such as liquid, moisture and dust particles enter the interior of the pressure sensor, which will affect the measurement accuracy and durability of the gauge pressure sensor, and there is a problem in realizing the sensor reference pressure balance. At the same time, the problem of the shortcomings of not being able to protect

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