mechanical pressure sensor

Abstract

The present invention proposes a mechanical pressure sensor, which is provided with double contacts or multiple contacts in contact with the metal wire row to prevent the overall pressure detection from being inaccurate when a single contact is set to fail in contact with the metal wire row; on this basis, the set Compared with the existing welding contacts, the arc-shaped contact has a larger contact area with the metal wire row, which can prevent the metal oxide particles from isolating the contact and the metal wire as far as possible, which is convenient for integrated molding and reduces costs; here Basically, the metal wires arranged in a fan shape are set, and the double contacts or multi-contacts can always keep in contact with the metal wires when rotating around the center of the circle. Compared with the existing parallel metal wires, the contact performance is better; setting the first The two contacts can support the body of the contact piece, making it more balanced on the left and right sides, preventing the body of the contact piece from tilting to one side and contacting the thick film resistor; the end is provided with an arc-shaped extension, which is easy to wear The swing frame is fixed thereto, and can keep in contact with the spring seat during the rotation of the contact piece body.

Description

Technical field [0001] The present invention relates to a pressure sensor, and particularly relates to a mechanical pressure sensor. Background technique [0002] Mechanical pressure sensors are widely used in automobiles, the power line of the hull, the water treatment engineering, industrial process measurement and control, hydraulic and pneumatic control engineering, the product has excellent vibration resistance, long life, easy installation, stable quality , reliable, wide operating temperature range. Field of application, which can be subdivided into oil pressure sensor and pressure type pressure sensor. [0003] like figure 1 , The mechanical pressure sensor core is an elastic member contacts a1 and a2 a thick film resistors, thick film resistors on a ceramic substrate comprising a2 a20, a20 ceramic substrate with a metal wire A21 arranged side by side, the adjacent metal lines continuous coating the thick film resistor layer A22, the zero wire spring contact pieces a1 and...

AI Technical Summary

Problems solved by technology

[0004] However, in actual use, it is found that when the mechanical pressure sensor is used for a long time, the elastic contact piece a1 rubs repeatedly with the metal wire a21 and the ceramic substrate a20, and metal oxide particles are prone to appear. When these particles just adhere to the metal wire When a21 is between the elastic contact piece a1, good electrical contact cannot be maintained between the two, resulting in the actual measured resistance value being too large and unstable, which in turn leads to inaccurate pressure detection

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