Scroll Liquid Pump

Abstract

An orbiting scroll having three sets of wraps is combined on a fixed scroll having three sets of wraps integral to a frame facing each other. The orbiting scroll is adhered on the fixed scroll by the discharge pressure acted to a part of the backside of the orbiting scroll. The orbiting scroll is finely movable to the radial direction and the wraps of the both scrolls contact each other. Thereby it provides a scroll liquid pump that increases the pressure and carries the liquid refrigerant or oil.

1 . A scroll liquid pump, wherein
 an orbiting scroll having three sets of orbiting wraps is combined to the fixed scroll having three sets of fixed wraps facing each other,   such that a pumping chamber is formed by each pair of orbiting and fixed wraps;   a primary bearing is placed on the center part of the fixed scroll;   a secondary bearing is placed in a bearing housing integral to the fixed scroll,   a rotary shaft is provided supported by the primary bearing and the secondary bearing, the rotary shaft carrying a crank shaft;   an orbiting bearing housing open to the surface of the orbiting scroll on which the orbiting wraps are carried is placed in the center part of the orbiting scroll;   an orbiting bearing is provided in the orbiting bearing housing; and the orbiting bearing is fitted to the crank shaft.   
     
     
         2 . The scroll liquid pump according to  claim 1 , wherein
 a rotary ring is mounted on the crank shaft;   the rotary ring has an elongate hole;   the crank shaft has a flattened part fitted by loose fitting into the elongate hole;   the rotary ring is finely movable in a direction of a long axis of the elongate hole against the crank shaft;   the long axis of the elongate hole of the rotary ring and of the flattened part of the crank shaft make a non-zero receding angle with a line joining the centre of the crank shaft and the centre of the rotary shaft against the rotating direction.   
     
     
         3 . The scroll liquid pump according to  claim 1 , wherein
 outlet ports are placed in the center part of the orbiting wraps provided in the orbiting scroll;   seal members are provided on the location of the diameter similar to the outer diameter of the orbiting wraps on the opposite side of the orbiting wraps;   the pressure of the fluid discharged from the outlet ports is exerted in the inner space of the seal members.