Scroll and manufacture method therefor

Abstract

Disclosed herein is a scroll for scroll compressor, comprising an orbiting and a stationary spiral each composed of a spiral body and a base plate, in which one of the spirals is made of metal and the other is made of elastic and plastic material to provide a mutual axial and radial compensating effect. The use of elastic and plastic material for making one of the spirals allows the two spirals to contact each other surface to surface instead of linear contact, and provides a sealing effect due to deformation of the material caused by squeezing. These spirals can be formed by molding, eliminating the need of machining and surface hardening, and providing a hard oxidized layer on their surface. The use of hard material for a spiral and soft material for another spiral can lower the requirement for precision of geometric shape without loss in operating efficiency, and consequently lower their production cost. Such features also reduce noise and vibration in orbiting, make them more wear resistant, and extend their service life.

1 - 20 . (canceled)  
   
   
       21 . A scroll comprising an orbiting spiral and a stationary spiral each composed of a spiral body and a corresponding base plate, characterized by using of elastic or plastic material, or elastic and plastic material for making either or both the spirals, and making use of the elasticity or plasticity of such material to decrease the unevenness of the contact surface of these two spirals and increase the contact surface area by deformation of the material caused by squeezing upon orbiting of the orbiting spiral around the stationary spiral so as to provide a sealing effect between two contact surfaces of these two spirals and a mutual axial and radial compensating effect during orbiting.  
   
   
       22 . The scroll as claimed in  claim 21  wherein either or both of the orbiting spiral and the stationary spiral are made of elastic or/and plastic material.  
   
   
       23 . The scroll as claimed in  claim 21  wherein the elastic or plastic material is polytetrafluoroethylene, polyurethane or synthetic rubber.  
   
   
       24 . The scroll as claimed in  claim 21  wherein the surface of the frame of either or both of the orbiting spiral and the stationary spiral is coated with elastic or/and plastic coating material.  
   
   
       25 . The scroll as claimed in  claim 24  wherein the frames of the orbiting spiral and the stationary spiral are formed with a plurality of through or blind pores to increase the bond strength of the said coating material.  
   
   
       26 . A scroll manufacture method characterized by the following steps: 
 making spiral bodies with sheet;    fixing each spiral body to a metal base plate; and    coating the outer surface of each spiral body and the bottom of each metal base plate contacting with the spiral body with an elastic material, or forming thereon a plastic layer by molding.    
   
   
       27 . The scroll manufacture method as claimed in  claim 26  wherein the said sheet is formed with a plurality of pores.  
   
   
       28 . The scroll manufacture method as claimed in  claim 26  herein the said sheet is a metal or plastic sheet.  
   
   
       29 . The scroll manufacture method as claimed in  claim 26  wherein said elastic material is either polytetrafluoroethylene, or polyurethane or synthetic rubber.  
   
   
       30 . A scroll manufacture method characterized by the following steps: 
 coating the sheet with elastic material; then    making spiral bodies; and    fixing each spiral body to a metal base plate.    
   
   
       31 . The scroll manufacture method as claimed in  claim 30  wherein said sheet is formed with a plurality of pores.  
   
   
       32 . The scroll manufacture method as claimed in  claim 30  wherein said sheet is a metal or plastic sheet.  
   
   
       33 . The scroll manufacture method as claimed in  claim 30  wherein said elastic material is either polytetrafluoroethylene, or polyurethane or synthetic rubber.  
   
   
       34 . A scroll manufacture method characterized by the following steps: 
 Forming of a frame for spiral body on each metal base plate by molding; and    Coating the frame and the metal base plate with elastic material, or forming thereon a plastic layer by molding.    
   
   
       35 . The scroll manufacture method as claimed in  claim 34  wherein the metal base plate and the frame for the spiral body are formed as an integrated part by molding.  
   
   
       36 . The scroll manufacture method as claimed in  claim 34  wherein the said elastic material is either polytetrafluoroethylene, or polyurethane or synthetic rubber.  
   
   
       37 . A scroll manufacture method characterized by forming of the scroll on the metal base plate with elastic material by molding.  
   
   
       38 . The scroll manufacture method as claimed in  claim 37  wherein the said elastic material is either polytetrafluoroethylene, or polyurethane or synthetic rubber.