Scroll fluid machine

Abstract

In the scroll fluid machine in which an orbiting scroll 10 is pivot-driven by a rotary shaft 102 rotatably supported by the casing 100 and a pivot shaft 104 eccentrically and rotatably supported by the rotary shaft 102 , as a method, a self-rotation prevention board 109 is attached to one end of the pivot shaft 104 and a self-rotation prevention pin 110 is attached to the self-rotation prevention board 109 . The self-rotation prevention pin 110 is configured to perform an orbiting motion while keeping in contact with the inner surface of the self-rotation prevention bearing (guide body) 111 . Further, as another method, the outer periphery of one end 104 b of the pivot shaft is configure to perform an orbiting motion while keeping in contact with the inner surface of the balance bearing (guide body) 51 . Based on these methods, an eccentrically pivot driven orbiting scroll performs an orbiting motion without whirling, and thus a high-speed operation of the scroll fluid machine is enabled.

1 . A scroll fluid machine, comprising:
 a rotary shaft, having a stator fixed to a casing, rotatably supported by said casing;   a rotor fixed to said rotary shaft;   a pivot shaft eccentrically and rotatably supported by said rotary shaft;   a self-rotation prevention means for preventing the self-rotation of said pivot shaft; and   a work part configured with combination of an orbiting scroll, fitted in a pivot drive part of said pivot shaft, having spiral wraps on both surfaces, and a pair of fixed scrolls fixed to one end of said casing, wherein:   said pivot shaft passes through said work part;   a fixed scroll located at the most outer part has a guide body; and   one end of said pivot shaft performs an orbiting motion guided by said guide body.   
     
     
         2 . The scroll fluid machine according to  claim 1 , wherein:
 said guide body is a self-rotation prevention guide fixed to said fixed scroll located at the most outer part; and   said self-rotation prevention means is configured with a self-rotation prevention board fixed to one end of said pivot shaft, self-rotation prevention pins attached to more than two locations of said self-rotation prevention board, and said self-rotation prevention guide; and   said self-rotation prevention pin performs an orbiting motion while keeping in contact with the inner surface of said self-rotation prevention guide.   
     
     
         3 . The scroll fluid machine according to  claim 2 , wherein:
 said self-rotation prevention guide is a self-rotation prevention bearing; and   said self-rotation prevention pin performs an orbiting motion while keeping in contact with the inner surface of the inner race of the self-rotation prevention bearing.   
     
     
         4 . The scroll fluid machine according to  claim 2 , wherein:
 said self-rotation prevention guide is a self-rotation prevention slide member having a circular hole, and;   said self-rotation prevention pin performs an orbiting motion while keeping in contact with the inner surface of the self-rotation prevention slide member.   
     
     
         5 . The scroll fluid machine according to  claim 2 , wherein:
 said self-rotation prevention guide produces a reaction force equivalent to the load radially produced at one end of said pivot shaft; thereby   preventing said pivot shaft from being radially displaced.   
     
     
         6 - 7 . (not entered) 
     
     
         8 . The scroll fluid machine according to  claim 1 , wherein: said guide body is a balance bearing, and;
 the outer periphery of the pivot shaft tip performs an orbiting motion while keeping in contact with the inner race of said balance bearing provided in the center part of the fixed scroll located at the most outer part.   
     
     
         9 . The scroll fluid machine according to  claim 8 , wherein:
 said balance bearing produces a reaction force equivalent to the load radially produced at one end of said pivot shaft, thereby preventing said pivot shaft from being radially displaced.   
     
     
         10 . The scroll fluid machine according to  claim 8 , wherein:
 said self-rotation prevention means is configured with a self-rotation prevention board attached to the other end of said pivot shaft, self-rotation prevention pins attached to more than two locations of the self-rotation prevention board, and a self-rotation prevention bearing fixed to the casing; and   said self-rotation prevention pin performs an orbiting motion while keeping in contact with the inner race of the self-rotation prevention bearing.   
     
     
         11 . The scroll fluid machine according to  claim 8 , wherein:
 said self-rotation prevention means is configured with a self-rotation prevention board attached to the other end of said pivot shaft, self-rotation prevention pins attached to more than two locations of the self-rotation prevention board, and a self-rotation prevention slide member, having a circular hole and fixed to the casing; and   said self-rotation prevention pin performs an orbiting motion while keeping in contact with the self-rotation prevention slide member.   
     
     
         12 . The scroll fluid machine according to  claim 8 , wherein one end of said pivot shaft having contact with said inner race of the balance bearing has a curved surface in the axis direction. 
     
     
         13 . The scroll fluid machine according to  claim 8 , wherein:
 a cover insulating the work chamber from outside air is provided in the center part of the fixed scroll located at the most outer part, and   an outlet is provided at a part of the casing.   
     
     
         14 . A scroll fluid machine, comprising:
 a rotary shaft, having a stator fixed to a casing, rotatably supported by said casing;   a rotor fixed to said rotary shaft;   a pivot shaft eccentrically and rotatably supported by said rotary shaft;   a self-rotation prevention means for preventing the self-rotation of said pivot shaft; and   a pair or pairs of work parts configured with combination of an orbiting scroll, fitted in a pivot drive part of said pivot shaft, having spiral wraps on both surfaces, and a fixed scroll, fixed to one end of said casing, having spiral wraps, and   a pair or pairs of work parts configured with combination of an orbiting scroll, fitted in a second pivot drive part of said pivot shaft, having spiral wraps on both surfaces, and a fixed scroll, fixed to the other end of said casing, having spiral wraps, wherein:   one end of said pivot shaft passes through said work part on one end side, a fixed scroll located at the most outer part on one end side has a guide body, and one end outer periphery of said pivot shaft performs an orbiting motion guided by said guide body on one end side; and   the other end of said pivot shaft passes through said work part on the other end side, a fixed scroll located at the most outer part on the other end side has a guide body, and the other end outer periphery of said pivot shaft performs an orbiting motion guided by said guide body on the other end side.   
     
     
         15 . The scroll fluid machine according to  claim 14 , wherein:
 said guide body is a balance bearing or a self-rotation prevention means;   said balance bearing is provided in the center part of the fixed scroll located at the most outer part at one side;   the tip outer periphery of said pivot shaft performs an orbiting motion while keeping in contact with said inner race of the balance bearing; and   said self-rotation prevention means is configured with a self-rotation prevention board fixed to the other end of said pivot shaft, self-rotation prevention pins attached to more than two locations of said self-rotation prevention board, and said self-rotation prevention guide fixed to the fixed scroll located at the most outer part located at the other side of said pivot shaft; and   said self-rotation prevention pin performs an orbiting motion while keeping in contact with the inner surface of said self-rotation prevention guide.   
     
     
         16 . The scroll fluid machine according to  claim 15 , wherein said self-rotation prevention guide is a self-rotation prevention bearing and said self-rotation prevention pin performs an orbiting motion while keeping in contact with the inner surface of the inner race of the self-rotation prevention bearing. 
     
     
         17 . The scroll fluid machine according to  claim 15 , wherein said self-rotation prevention guide is a self-rotation prevention slide member having a circular hole, and said self-rotation prevention pin performs an orbiting motion while keeping in contact with the inner surface of the self-rotation prevention slide member. 
     
     
         18 - 19 . (not entered) 
     
     
         20 . The scroll fluid machine according to  claim 14 , wherein said guide body is a balance bearing, and the outer periphery of both ends of the pivot shaft performs an orbiting motion while keeping in contact with the inner race of said balance bearing provided in the center part of the fixed scroll located at the most outer part at both sides. 
     
     
         21 . The scroll fluid machine according to  claim 20 , wherein:
 said self-rotation prevention means is configured with a self-rotation prevention guide fixed to the fixed scroll at the most inner side that is fixed to one end or the other end of the casing, a self-rotation prevention board attached to said pivot shaft near the self-rotation prevention guide, and a self-rotation prevention pins attached to at least two or more locations of the self-rotation prevention board; and   the self-rotation prevention pins perform an orbiting motion while keeping in contact with the inner surface of said self-rotation prevention guide.   
     
     
         22 . The scroll fluid machine according to  claim 21 , wherein said self-rotation prevention guide is a self-rotation prevention bearing, and said self-rotation prevention pins perform an orbiting motion while keeping in contact with the inner surface of the inner race of the self-rotation prevention bearing. 
     
     
         23 . The scroll fluid machine according to  claim 21 , wherein said self-rotation prevention guide is a self-rotation prevention slide member having a circular hole, and said self-rotation prevention pins perform an orbiting motion while keeping in contact with the inner surface of the self-rotation prevention slide member. 
     
     
         24 . The scroll fluid machine according to  claim 21 , wherein a cover insulating the work chamber from outside air is provided in the center part of the fixed scroll located at the most outer part, and an outlet is provided at a part of the casing. 
     
     
         25 . A scroll fluid machine, comprising:
 (1) a rotary shaft, having a stator fixed to a casing, rotatably supported by said casing;   (2) a rotor fixed to said rotary shaft;   (3) a pivot shaft eccentrically and rotatably supported by said rotary shaft;   a self-rotation prevention means for preventing the self-rotation of said pivot shaft;   (4) a self-rotation prevention means for preventing the self-rotation of said pivot shaft; and   (5) four sets of work chambers configured with combination of a fixed scroll having wraps on one surface, an orbiting scroll having wraps on both surfaces, a fixed scroll having wraps on both surfaces, an orbiting scroll having wraps on both surfaces, and a fixed scroll having wraps on one surface, with the wraps combined with each other in this order, wherein:
 said two orbiting scrolls are attached in series to said pivot shaft; 
 a hole that allows said pivot shaft to pass through and perform an orbiting motion, is provided at the paneling of said three fixed scroll; 
 a balance bearing is provided in the center part of the paneling of the fixed scroll that is located at the most outer part; and 
 the outer periphery of the pivot shaft tip performs an orbiting motion while keeping in contact with the inner surface of the inner race of said balance bearing. 
   
     
     
         26 . The scroll fluid machine according to  claim 25 , wherein the phases of starting the inlet or the outlet are all shifted in said four sets of work chambers and the shifted amounts are multiples of 90 degrees. 
     
     
         27 . The scroll fluid machine according to  claim 25 , wherein: two sets of the work chambers on one side of said four sets of the work chambers are expanders, and the other two sets of the work chambers adjacently provided on the other side are compressors, and
 a seal mechanism sealing between the expander and the compressor is provided at a through-hole of the pivot shaft in the center part of the paneling of the fixed scroll that is located between said expander and said compressor, having wraps on both sides of the paneling.   
     
     
         28 . (not entered) 
     
     
         29 . The scroll fluid machine according to  claim 25 , wherein the paneling is divided in the fixed scroll that is located in the middle of said four sets of the work chamber, having wraps on both sides, and a heat insulating plate is inserted between said divided paneling. 
     
     
         30 . The scroll fluid machine according to  claim 1 , wherein a seal mechanism sealing between the work chamber and the casing is provided in the center part of the paneling of the fixed scroll that is directly connected to the casing. 
     
     
         31 . The scroll fluid machine according to  claim 27 , wherein said seal seals both surfaces of a disk integrally attached to the pivot shaft with a ring-shaped sealing member. 
     
     
         32 . The scroll fluid machine according to  claim 1 , wherein an outlet cover configuring an outlet separating the outlet chamber from outside air is provided at the paneling of the fixed scroll at the most outer side. 
     
     
         33 . (not entered) 
     
     
         34 . The scroll fluid machine according to  claim 1 , wherein the cross-section of a fitting part between a pivot drive part or a second pivot drive part and a hole in the center part of the orbiting scroll, has a noncircular shape. 
     
     
         35 . The scroll fluid machine according to  claim 34 , wherein the fitting parts of the pivot drive part or the second pivot drive part and the hole of the center part of said orbiting scroll, are slidable to each other in the axis direction. 
     
     
         36 . The scroll fluid machine according to  claim 2 , wherein:
 if the outer diameter of said self-rotation prevention pin provided at the self-rotation prevention board that is attached to one end of said pivot shaft, is defined as d 1 , the inner diameter of the inner race of said self-rotation prevention bearing or the inner diameter of said self-rotation prevention slide member is defined as D 1 , and the orbit radius of the pivot shaft is defined as ε; then   the difference between the values of D 1 −d 1  and 2ε is determined so as to be smaller than the bearing inner gap of said self-rotation prevention bearing.   
     
     
         37 . The scroll fluid machine according to  claim 8 ; wherein:
 if the outer diameter of one end or the other end of said pivot shaft is defined as d 2 , the inner diameter of the inner race of said balance bearing is defined as D 2 , and the orbit radius of the pivot shaft is defined as ε; then   the difference between the values of D 2 −d 2  and 2ε is determined so as to be smaller than the bearing inner gap of said balance bearing.   
     
     
         38 . The scroll fluid machine according to  claim 10 , wherein:
 if the outer diameter of said self-rotation prevention pin attached to the self-rotation prevention board that is attached to the other end or the middle part of said pivot shaft, is defined as d 3 , the inner diameter of the inner race of said self-rotation prevention bearing or the inner diameter of the self-rotation prevention slide member is defined as D 3 , and the orbit radius of the pivot shaft is defined as ε; then   the difference between the values of D 3 −d 3  and 2ε is determined so as to be smaller than the bearing inner gap of said self-rotation prevention bearing.   
     
     
         39 . (not entered)