Scroll Compressor

Abstract

The purpose of the present invention is to suppress the contact between the wrap tooth tip and the tooth bottom by enlarging the tooth bottom step, and to reduce the loss owing to the gap as a result of enlarging the tooth bottom step. The fixed scroll includes a fixed scroll-side flat plate and a fixed-side wrap standing on one surface of the fixed-side plate while retaining the spiral shape. The orbiting scroll includes an orbiting-side plate and an orbiting-side wrap standing on one surface of the orbiting-side plate while retaining the spiral shape. The orbiting-side wrap orbits with respect to the fixed scroll while being in mesh with the fixed side wrap to form a compression chamber. Each of the fixed-side plate and the orbiting-side plate has the step on the tooth bottom at the inner periphery deeper than the step on the tooth bottom at the outer periphery. The step at the outer or the inner periphery, which is formed on the tooth bottom of the orbiting-side plate, has the depth smaller than the one on the tooth bottom of the fixed-side plate.

1 . A scroll compressor comprising:
 a fixed scroll including a fixed-side plate and a fixed-side wrap standing on one surface of the fixed-side plate while retaining a spiral shape;   an orbiting scroll including an orbiting-side plate, and an orbiting-side wrap standing on one surface of the orbiting-side plate while retaining a spiral shape, which allows the orbiting-side wrap to be in mesh with the fixed-side wrap for orbiting with respect to the fixed scroll to form a compression chamber; and   an electric motor for driving the orbiting scroll via a crankshaft,   wherein each tooth bottom of the fixed-side wrap and the orbiting-side wrap has a step formed to become deeper from an outer periphery to an inner periphery; and   the step is formed on the tooth bottom of the fixed-side wrap at the inner periphery so as to be deeper than the step formed on the tooth bottom of the orbiting-side wrap at the inner periphery.   
     
     
         2 . The scroll compressor according to  claim 1 ,
 wherein two steps are formed on the tooth bottom of the fixed-side wrap;   one step is formed on the tooth bottom of the orbiting-side wrap; and   the fixed-side wrap has the step formed on the tooth bottom at the innermost periphery deeper than the step formed on the tooth bottom of the orbiting-side wrap at the inner periphery.   
     
     
         3 . The scroll compressor according to  claim 2 , wherein the step formed on the tooth bottom of the orbiting-side wrap at the inner periphery has substantially the same depth as the depth of the second deepest step formed on the tooth bottom of the fixed-side wrap. 
     
     
         4 . The scroll compressor according to  claim 1 , wherein the step formed on the tooth bottom of the orbiting-side wrap at the innermost periphery has the depth substantially half the depth of the deepest step formed on the tooth bottom of the fixed-side wrap. 
     
     
         5 . The scroll compressor according to  claim 1 , wherein the step formed on the tooth bottom of the orbiting-side wrap at the innermost periphery has the depth ranging from 0.005% to 0.02% of an orbiting-side wrap tooth height  6   h.    
     
     
         6 . The scroll compressor according to  claim 1 , wherein the electric motor including a stator and a rotor is configured as a ferrite magnet electric motor having a ferrite magnet embedded in the rotor. 
     
     
         7 . The scroll compressor according to  claim 1 , wherein an R32 refrigerant is only filled into a refrigeration cycle, or filled into the refrigeration cycle at a rate of approximately 70% or higher.