Variable capacity scroll compressor

Abstract

Disclosed is a variable capacity scroll compressor including one or more bypass ports formed in a compression space, the bypass port being manipulated by intake/exhaust pressure of the compressor to control compression volume in multi-stages.

1 . A variable capacity scroll compressor comprising: 
 a motor;    a driving shaft driven by the motor;    an orbiting scroll member orbited by the driving shaft;    a stationary scroll member in mesh with the orbiting scroll member to form a compression space;    two or more bypass ports formed along the compression space, the bypass port allowing fluid being compressed to be bypassed at two or more points and thereby enabling to control a compression volume in three or more stages;    a bypass passage having a first end connected to the bypass port and a second end connected to the intake chamber that is in a low-pressure state;    a check valve for selectively connecting the bypass passage to the bypass port;    a control valve for selectively applying one of low-pressure fluid in an intake passage of the scroll compressor and high-pressure fluid in an exhaust passage of the scroll compressor to control the check valve to one of opening and closing positions; and    a control passage allowing the pressure of the fluid selected by the check valve to be applied to the check valve.    
   
   
       2 . The variable capacity scroll compressor according to  claim 1 , wherein the check valve connecting the control valve with the check valve passes through a point of an upper seal case covering a top of a high pressure chamber.  
   
   
       3 . The variable capacity scroll compressor according to  claim 1 , further comprising: 
 a seal case partly covering the compressor;    two or more control passages connecting the control valve with the check valve, and    a sealing member formed at a part of a contact portion where the control passage is in contact with the seal case at a position where the control passages are concentrated and pass through the seal case.    
   
   
       4 . The variable capacity scroll compressor according to  claim 3 , wherein the sealing member formed at the point where the control passage passes through the seal case has a lower side corner extending toward an exterior so as not to be separated.  
   
   
       5 . The variable capacity scroll compressor according to  claim 1 , wherein the bypass port is formed adjacent to an inner circumference and/or an outer circumference of a stationary helical wrap.  
   
   
       6 . The variable capacity scroll compressor according to  claim 1 , wherein the bypass port is formed on the stationary helical wrap.  
   
   
       7 . The variable capacity scroll compressor according to  claim 1 , wherein the bypass port is formed in at least one of first and second compression spaces.  
   
   
       8 . The variable capacity scroll compressor according to  claim 1 , wherein the check valve is controlled by pressure.  
   
   
       9 . A variable capacity scroll compressor comprising: 
 two or more bypass ports formed along a compression space of a scroll member, the bypass port allowing fluid in compression to be bypassed at two or more points;    a bypass passage having one end connected to each of the bypass ports and allowing the fluid in compression to be bypassed;    a check valve for controlling the bypass passage in an opening state or a closing state; and    a control valve for allowing at least high-pressure fluid of an exhaust passage of the scroll compressor to be selectively applied to the check valve via a predetermined control passage so as to control the check valve to one of opening and closing positions.    
   
   
       10 . The variable capacity scroll compressor according to  claim 9 , wherein the bypass port is three or four.  
   
   
       11 . The variable capacity scroll compressor according to  claim 9 , wherein the bypass port has an exhaust port connected with an intake port of the scroll compressor.  
   
   
       12 . The variable capacity scroll compressor according to  claim 9 , wherein the check valve moves toward a pressure-less side between the pressure of the control valve and fluid pressure while being compressed.  
   
   
       13 . The variable capacity scroll compressor according to  claim 9 , wherein the check valve is moved by fluid pressure.  
   
   
       14 . The variable capacity scroll compressor according to  claim 9 , wherein the control passage comprises a plurality of control passages, which are bound in a bundle when entering inside the scroll compressor.  
   
   
       15 . The variable capacity scroll compressor according to  claim 9 , further a sealing member for sealing a contact portion with which the control passage is in contact when entering inside the scroll compressor.  
   
   
       16 . The variable capacity scroll compressor according to  claim 9 , wherein the control passage forms a single module.  
   
   
       17 . A variable capacity scroll compressor comprising: 
 two or more bypass ports formed in a compression space, for allowing compressed fluid to be bypassed;    a check valve for controlling opening and closing states of the bypass port; and    a plurality of control passages formed in a single module, an exhaust pressure of the compressor being selectively applied toward the check valve so as to control operational states of the check valve.    
   
   
       18 . The variable capacity scroll compressor according to  claim 17 , wherein the single module is formed at a portion where the compressor meets the control passage.  
   
   
       19 . The variable capacity scroll compressor according to  claim 17 , wherein the bypass port allows the scroll compressor to be operated in multi-stages.  
   
   
       20 . The variable capacity scroll compressor according to  claim 17 , wherein a portion where the single module is in contact with the compressor is sealed.