Enclosed pump switch level control system

F - Mech Eng,Light,Heat,Weapons – 04 – B

Patent

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Details

F04B 49/00 (2006.01) F04D 15/02 (2006.01) H01H 35/18 (2006.01)

Patent

CA 2477640

An arrangement (10) for controlling the liquid level in a basin (60) by selectively actuating a pump (64) has an environmentally-sealed enclosure (22) with an internal volume subject to thermal and pressure effects. A first (14) and a second (16) pressure sensing means are positioned in the enclosure and a barrier fluid (18) fills a balance of the internal volume. The first sensing means (14) is in a first chamber (22a) of the enclosure (22) and the second sensing means (16) is in a second chamber (22b). The barrier fluid (18) has a first portion (18a) in the first chamber (22a) and a second portion in the second chamber (22b). The first pressure sensing means (14) communicates an "on/off" signal to the pump (64). Diaphragms (26, 40) in the respective chambers (22a, 22b) allow the device to adjust to changes in atmospheric pressures. The barrier fluid (18) is electrically non-conductive, chemically non-reactive with any materials comprising the pressure sensing means and, preferably, an oil.

L'invention concerne un dispositif (10) qui permet de r~gler le niveau d'un liquide plac~ dans une cuve (60) en actionnant s~lectivement la pompe (64). Le dispositif comprend un couvercle ~tanche (22) dont le volume int~rieur utile est sensible aux effets thermique et de pression. Un premier (14) et un second (16) d~tecteurs de pression sont plac~s dans le couvercle et un fluide de barrage (18) r~tablit l'~quilibre du volume int~rieur utile. Le premier d~tecteur (14) est situ~ dans une premi­re chambre (22a) du couvercle (22) et le second d~tecteur (16) dans une seconde chambre (22b). Une premi­re partie (18a) du fluide de barrage (18) est situ~e dans la premi­re chambre (22a) et une seconde partie (18a) se trouve dans la seconde chambre (22b). Le premier d~tecteur (14) communique ~ la pompe (64) un signal de "marche-arrÚt". Le second d~tecteur (16) communique ~ la pompe (64) un signal d'avertissement pour niveau haut. Des diaphragmes (26, 40) pr~sents dans les chambres respectives (22a, 22b) permettent au dispositif de se r~gler en fonction des variations de la pression atmosph~rique. Le fluide de barrage (18) n'est pas conducteur d'~lectricit~, et ne pr~sente aucune r~action chimique avec une mati­re contenant le d~tecteur de pression, de pr~f~rence l'huile.

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