Valve for air conditioning system with proportional solenoid

F - Mech Eng,Light,Heat,Weapons – 16 – K

Patent

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Details

F16K 31/06 (2006.01) F25B 41/06 (2006.01) H01F 7/16 (2006.01)

Patent

CA 2147156

An expansion valve (10) for heat transfer systems such as an air conditioning system, includes a control element (20) for controlling the flow rate of working fluid through the valve. The control element has a stem member (28) and movable member (42) movable on the stem member. Openings (38) to an internal passage (30) in the stem member are regulated by positioning the movable member to achieve regulated flow rate of refrigerant material through the valve. The movable member of the control element is moved by a plunger (24) of a proportional solenoid (22). The proportional solenoid has a magnetic flux circuit including a low permeance isolation tube (62) surrounding the plunger, which enables removal of the coil (76) and frame (78) of the solenoid from the valve. The solenoid further includes a variable permeance flux washer (69) the flux through which varies with plunger position, which is disposed from a gap (82) which provides an area of magnetic saturation. The proportional solenoid produces force/displacement characteristics which enable precise control of the control element and accurate regulation of the refrigerant flow rate through the valve.

Une vanne d'expansion (10) pour des systèmes de transfert de chaleur tels qu'un système d'air conditionné comprend un élément de régulation (20) permettant de réguler le débit d'un fluide passant à travers la vanne. L'élément de régulation possède une tige (28) et un élément mobile (42) en mouvement sur la tige. Des orifices (38) donnant sur un passage interne (30) de la tige sont régulés en positionnant l'élément mobile afin d'obtenir un débit régulé du fluide réfrigérant à travers la vanne. L'élément mobile de l'élément de régulation est déplacé par un piston (24) d'un solénoïde proportionnel (22). Le solénoïde proportionnel possède un circuit de flux magnétique comprenant un tube d'isolation de faible perméance (62) qui entoure le piston, afin de pouvoir démonter la bobine (76) et le cadre (78) du solénoïde de la vanne. Le solénoïde comprend en outre une rondelle de flux à perméance variable (69), le flux passant à travers la rondelle variant en fonction de la position du piston, et étant disposé en laissant un espace (82) pour former une zone de saturation magétique. Le solénoïde proportionnel produit des caractéristiques de force/déplacement qui permettent une commande précise de l'élément de régulation et une régulation précise du débit de réfrigérant à travers la vanne.

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