Scroll fluid machine

Abstract

A fixed scroll board 2 is attached to a casing 1 . Three fixed wraps 2 a are provided on the fixed scroll board 2 . An eccentric bush 8 is rotatably supported by the casing 1 . A pivot shaft 12 is eccentrically supported in an eccentric hole of the eccentric bush 8 . A scroll board 3 with three orbiting wraps 3 a is provided integrally with the pivot shaft 12 . A plurality of pumping chambers 13 are formed between the fixed wraps 2 a and the orbiting wraps 3 a . An inlet port 4 , which is communicated with an intake chamber formed inside a seal wall 2 b of the periphery of the fixed scroll board 2 , is provided. An outlet port 5 is provided on the fixed scroll board 2 . The pumping chambers 13 takes in and discharges working fluid three times during one rotation of the eccentric bush 8.

1 . A scroll fluid machine, wherein:
 a fixed scroll board is attached to a casing;   a plurality of fixed wraps are provided on the fixed scroll board;   an orbiting scroll board is attached to an eccentrically-orbiting member;   a plurality of orbiting wraps are provided on the orbiting scroll board; and   the fixed wraps and the orbiting wraps are configured to overlap each other.   
     
     
         2 . The scroll fluid machine according to  claim 1 , wherein:
 a seal wall is provided on the periphery of the fixed scroll board;   an intake chamber is formed between the fixed scroll board and the orbiting scroll board; and   an inlet port, which is communicated with the intake chamber, is provided on the fixed scroll board.   
     
     
         3 . The scroll fluid machine according to  claim 1 , wherein:
 a cover is provided on the front side of the fixed scroll board;   an outlet port is provided in the center part of the fixed wraps of the fixed scroll board; and   a collective outlet port, which is communicated with the outlet port, is provided on the cover.   
     
     
         4 . The scroll fluid machine according to anyone of  claims 1 , wherein a plurality of the fixed wraps and the orbiting wraps are provided at different arrangement angles such that phase angles of the fixed wraps and the orbiting wraps adjoining each other are shifted. 
     
     
         5 . The scroll fluid machine according to anyone of  claims 1 , wherein three of the fixed wraps and the orbiting wraps are provided at every 120° of arrangement angle such that the phase angles of said fixed wraps and said orbiting wraps adjoining each other are shifted by 120°. 
     
     
         6 . The scroll fluid machine according to anyone of  claims 1 , wherein:
 the cover is fixed to the casing; and   the fixed scroll board is attached to the cover movably in the axial direction of the orbiting member.   
     
     
         7 . The scroll fluid machine according to anyone of  claims 1 , wherein the orbiting member is a pivot shaft rotatably supported in an eccentric hole of an eccentric bush. 
     
     
         8 . The scroll fluid machine according to anyone of  claims 1 , wherein the orbiting member is a pivot shaft rotatably supported in an eccentric hole of a rotary shaft of an electric motor. 
     
     
         9 . The scroll fluid machine according to  claims 8 , wherein:
 three of the orbiting wraps are provided; and   the inner center position of a triangle formed of the centers of the three orbiting wraps of the orbiting scroll board, is attached to the pivot shaft while preventing the relative rotation.   
     
     
         10 . The scroll fluid machine according to  claim 8 , wherein:
 a fixed scroll is attached to the casing;   an orbiting scroll is attached to the end of the pivot shaft opposite to the end to which the orbiting scroll board is attached; and   the wraps of the fixed scroll and the wraps of the orbiting scroll are configured to overlap each other.   
     
     
         11 . The scroll fluid machine according to  claim 10 , wherein a first scroll work part including the fixed scroll board and the orbiting scroll board is used as a pump, while a second scroll work part including the orbiting scroll and the fixed scroll is used as an expander. 
     
     
         12 . The scroll fluid machine according to  claim 11 , wherein a heat-insulating board is provided between the first scroll work part and the second scroll work part. 
     
     
         13 . The scroll fluid machine according to  claim 11 , wherein:
 the collective outlet port of the pump is connected to an inlet of the expander via an evaporator;   and a relief valve connected to the inlet port and the collective outlet port is provided.   
     
     
         14 . The scroll fluid machine according to anyone of  claims 1 , wherein:
 the fixed scroll board is made of cast iron; and   the orbiting scroll board is made of aluminum alloy.   
     
     
         15 - 16 . (canceled) 
     
     
         17 . The scroll fluid machine according to anyone of  claims 1 , wherein:
 the fixed scroll board and the orbiting scroll board are made of aluminum alloy; and   at least one of the surfaces of the fixed scroll board and the orbiting scroll board is coated with coating material.   
     
     
         18 . The scroll fluid machine according to anyone of  claims 1 , wherein at least one of the fixed scroll board and the orbiting scroll board is formed of self lubricating resin by molding. 
     
     
         19 - 20 . (canceled) 
     
     
         21 . The scroll fluid machine according to claim  15 , wherein the coating material is diamond-like carbon, molybdenum disulfide or fluorine contained resin.