Variable capacity scroll compressor

Abstract

Disclosed is a variable capacity scroll compressor including an intake passage connected to an intake chamber, an exhaust passage connected to an exhaust chamber, a bypass port formed through a wall defining a compression space, 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, and a control valve for selectively applying one of low-pressure fluid and high-pressure fluid in the exhaust passage to the check valve to control the check valve to one of opening and closing positions.

1 . A variable capacity scroll compressor comprising: 
 a bypass port formed through a wall defining a compression space;    a bypass passage having a first end connected to the bypass port and a second end connected to an intake chamber that is in a low-pressure state;    a check valve for selectively connecting the bypass passage to the bypass port; and    a control valve for selectively applying one of low-pressure fluid and high-pressure fluid in an exhaust passage to the check valve to control the check valve to one of opening and closing positions.    
     
     
         2 . The variable capacity scroll compressor according to  claim 1 , wherein the control valve is connected to (a) a low-pressure passage connected to an intake passage, (b) a high-pressure passage connected to the exhaust passage, and (c) a control passage connected to the check valve, thereby controlling an application of pressure.  
     
     
         3 . The variable capacity scroll compressor according to  claim 1 , wherein the check valve is a float valve.  
     
     
         4 . The variable capacity scroll compressor according to  claim 1 , wherein the bypass port is formed at a stationary scroll member.  
     
     
         5 . The variable capacity scroll compressor according to  claim 1 , wherein the bypass port is formed at an orbiting scroll member.  
     
     
         6 . The variable capacity scroll compressor according to  claim 1 , wherein the control valve is a solenoid valve.  
     
     
         7 . The variable capacity scroll compressor according to  claim 1 , wherein the bypass port is formed on an opposite side of a location, where a start point of the compression space is formed, based on a center of a scroll member.  
     
     
         8 . The variable capacity scroll compressor according to  claim 1 , wherein the bypass port is formed at a location where the bypass port can be closed by a rotational scroll wrap.  
     
     
         9 . The variable capacity scroll compressor according to  claim 1 , wherein the low-pressure fluid is supplied through an intake passage of the compressor.  
     
     
         10 . The variable capacity scroll compressor according to  claim 1 , wherein the control valve is connected to (a) a high-pressure passage connected to the exhaust passage and (b) a control passage connected to the check valve, thereby controlling an application of pressure applying.  
     
     
         11 . The variable capacity scroll compressor according to  claim 1 , wherein the control passage is formed penetrating a seal plate dividing a low-pressure side from a high-pressure side.  
     
     
         12 . A variable capacity scroll compressor comprising: 
 a bypass port formed on a compression path defined between first and second scroll members;    a check valve for controlling opening and closing states of the bypass port; and    a bypass controller for controlling an opening/closing operation of the check valve using at least pressure applied from an exhaust passage.    
     
     
         13 . The variable capacity scroll compressor according to  claim 1 , wherein the bypass controller comprises: 
 a control valve for selectively supplying one of fluid pressure of an intake passage and fluid pressure of the exhaust pressure; and    a control passage having opposite ends respectively connected to the control valve and the check valve to apply the fluid pressure supplied from the control valve to the check valve.    
     
     
         14 . The variable capacity scroll compressor according to  claim 12 , wherein the bypass controller comprises: 
 a control valve for selectively supplying fluid pressure of the exhaust passage; and    a control passage having opposite ends respectively connected to the control valve and the check valve to apply the fluid pressure supplied from the control valve to the check valve.    
     
     
         15 . The variable capacity scroll compressor according to  claim 12 , wherein fluid being compressed is exhausted to an intake chamber through the bypass port.  
     
     
         16 . The variable capacity scroll compressor according to  claim 12 , wherein the bypass port is designed to bypass fluid compressed in at least one of two intake spaces.  
     
     
         17 . The variable capacity scroll compressor according to  claim 12 , wherein the bypass port is defined between an inner circumference of a rotational scroll wrap formed on the first scroll member and an outer circumference of a rotational scroll wrap formed on the second scroll member.  
     
     
         18 . The variable capacity scroll compressor according to  claim 12 , wherein the check valve comprises a check ball that is designed to freely move in a cavity by fluid pressure.  
     
     
         19 . A variable capacity scroll compressor comprising: 
 a bypass port formed on a compression path defined between first and second scroll members;    a float valve for controlling opening and closing states of the bypass port; and    a bypass controller for controlling an operation of the check valve by high-pressure fluid applied from an exhaust passage.    
     
     
         20 . A variable capacity scroll compressor according to  claim 19 , wherein, in order to control the operation of the check valve, low-pressure fluid may be further applied to the bypass controller from an intake passage.  
     
     
         21 . A variable capacity scroll compressor according to  claim 19 , wherein the bypass port is formed at a location allowing for both of symmetry and asymmetry operation modes of the scroll compressor.  
     
     
         22 . A variable capacity scroll compressor according to  claim 19 , wherein the bypass port is formed on a sidewall defining a compression space.