Pressure-sensitive switch, its method of calibration and use...

H - Electricity – 01 – H

Patent

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Details

H01H 35/34 (2006.01) G01V 1/00 (2006.01) G01V 1/18 (2006.01) G01V 1/20 (2006.01) G01V 13/00 (2006.01)

Patent

CA 2401008

A pressure-sensitive switch comprises (16) a base member (32) having a mounting surface (36) formed of electrically insulating material; two electrodes (38, 40) mounted on the base member (32) and each having an electrically conductive contact surface, and a flexible diaphragm (34) having its periphery secured in a fluid- tight manner to the mounting surface with its electrically conductive central portion overlying the contact surfaces of the electrodes. The diaphragm (34), which is formed with plural corrugations (66, 68, 70), is exposed to the external pressure. When the switch is exposed to atmospheric pressure, the central portion of the diaphragm does not touch the contact surfaces of said electrodes, but when the switch is exposed to a super-atmospheric pressure, the central portion is forced into contact with both contact surfaces, thus electrically connecting the two electrodes (38, 40). This pressure sensitive switch is especially useful for use with hydrophones, as in seismic streamer cables.

L'invention concerne un interrupteur manométrique (16) à membrane comprenant un élément de base (32) possédant une surface de montage (36) constituée d'un matériau isolant ; deux électrodes (38, 40) montées sur l'élément de base (32) et possédant une surface de contact conductrice d'électricité, et une membrane souple (34) dont la périphérie est fixée, de manière étanche aux fluides, à la surface de montage, sa partie centrale conductrice étant placée sur les surfaces de contact des électrodes. La membrane (34), qui présente plusieurs ondulations (66, 68, 70), est exposée à la pression extérieure. Lorsque l'interrupteur est exposé à la pression atmosphérique, la partie centrale de la membrane ne touche pas les surfaces de contact des électrodes, tandis que lorsque l'interrupteur subit une pression supérieure à la pression atmosphérique, cette dernière force ladite partie centrale à toucher les deux surfaces de contact, établissant ainsi un contact électrique entre les deux électrodes (38, 40). L'interrupteur manométrique de l'invention convient particulièrement à une utilisation avec des hydrophones, notamment pour des câbles de flûte sismique.

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