Refrigerant compressor and refrigeration appliance using same

Abstract

A synthetic resin film is formed on a region of a valve plate ( 117 ) which is brought into contact with an arm portion of a suction valve ( 120 ) or a region of the valve plate ( 117 ) which is brought into contact with an arm portion of a discharge valve ( 121 ). With such a configuration, delay in opening of the suction valve ( 120 ) or the discharge valve ( 121 ) caused by adhesion force of refrigerating oil is suppressed so that a pressure loss in a suction stroke or a discharge stroke can be reduced whereby compressor efficiency is enhanced. Further, a striking sound generated at the time of closing the suction valve ( 120 ) or the discharge valve ( 121 ) is reduced by an elastic effect of the synthetic resin film so that the reduction of noises is realized.

1 . A refrigerant compressor comprising, inside a sealed container:
 a cylinder which houses a piston movable in a reciprocating manner;   a valve plate which is disposed on an opening end of the cylinder and has a suction valve seat formed so as to surround a suction hole; and   a suction valve configured to open and close the suction hole,   wherein   the suction valve includes an opening and closing portion, and an arm portion to be operated along with opening and closing of the opening and closing portion, and   the refrigerant compressor further comprises a synthetic resin film in at least a region of the valve plate which is brought into contact with the arm portion of the suction valve.   
     
     
         2 . A refrigerant compressor comprising, inside a sealed container:
 a cylinder which houses a piston movable in a reciprocating manner;   a valve plate which is disposed on an opening end of the cylinder and has a discharge valve seat formed so as to surround a discharge hole; and   a discharge valve configured to open and close the discharge hole,   wherein   the discharge valve includes an opening and closing portion, and an arm portion to be operated along with opening and closing of the opening and closing portion, and   the refrigerant compressor further comprises a synthetic resin film in at least a region of the valve plate which is brought into contact with the arm portion of the discharge valve.   
     
     
         3 . A refrigerant compressor comprising, inside a sealed container:
 a cylinder which houses a piston movable in a reciprocating manner;   a valve plate which is disposed on an opening end of the cylinder and has a suction valve seat formed so as to surround a suction hole; and   a suction valve configured to open and close the suction hole,   wherein   the suction valve includes an opening and closing portion, and an arm portion to be operated along with opening and closing of the opening and closing portion, and   the refrigerant compressor further comprises a synthetic resin film in at least a region of the arm portion of the suction valve which is brought into contact with the valve plate.   
     
     
         4 . A refrigerant compressor comprising, inside a sealed container:
 a cylinder which houses a piston movable in a reciprocating manner;   a valve plate which is disposed on an opening end of the cylinder and has a discharge valve seat formed so as to surround a discharge hole; and   a discharge valve configured to open and close the discharge hole,   wherein   the discharge valve includes an opening and closing portion, and an arm portion to be operated along with opening and closing of the opening and closing portion, and   the refrigerant compressor further comprises a synthetic resin film in at least a region of the arm portion of the discharge valve which is brought into contact with the valve plate.   
     
     
         5 . A refrigerant compressor comprising, inside a sealed container:
 a cylinder which houses a piston movable in a reciprocating manner;   a valve plate which is disposed on an opening end of the cylinder and has a suction valve seat formed so as to surround a suction hole; and   a suction valve configured to open and close the suction hole,   wherein   the suction valve includes an opening and closing portion, and an arm portion to be operated along with opening and closing of the opening and closing portion, and   the refrigerant compressor further comprises a surface treatment film containing a synthetic resin, in a region of the valve plate which opposes the opening and closing portion of the suction valve or on the opening and closing portion of the suction valve.   
     
     
         6 . The refrigerant compressor according to  claim 5 , wherein the surface treatment film containing the synthetic resin is disposed in either one of a region of the valve plate which opposes a fixed portion of the suction valve or the fixed portion of the suction valve. 
     
     
         7 . The refrigerant compressor according to  claim 5 , wherein a recessed portion is formed on a region of the valve plate which opposes the arm portion of the suction valve on a side opposite to the opening and closing portion. 
     
     
         8 . The refrigerant compressor according to  claim 1 , wherein the synthetic resin film is disposed in either one of a region of the valve plate which opposes opening and closing portion of the suction valve or the opening and closing portion of the suction valve. 
     
     
         9 . The refrigerant compressor according to  claim 1 , wherein the synthetic resin film contains fluororubber as a binder, and a fluororesin as a solid lubricant. 
     
     
         10 . The refrigerant compressor according to  claim 2 , wherein the synthetic resin film contains fluororubber as a binder, and a fluororesin as a solid lubricant. 
     
     
         11 . The refrigerant compressor according to  claim 3 , wherein the synthetic resin film contains fluororubber as a binder, and a fluororesin as a solid lubricant. 
     
     
         12 . The refrigerant compressor according to  claim 4 , wherein the synthetic resin film contains fluororubber as a binder, and a fluororesin as a solid lubricant. 
     
     
         13 . The refrigerant compressor according to  claim 1 , wherein a total film thickness of the synthetic resin film is set to a value which falls within a range of 1 μm to 100 μm. 
     
     
         14 . A refrigeration appliance comprising a refrigerant circuit which is formed by annularly connecting the refrigerant compressor according to  claim 1 , a radiator, a pressure reduction device, and a heat absorber, by a pipe. 
     
     
         15 . The refrigerant compressor according to  claim 2 , wherein a total film thickness of the synthetic resin film is set to a value which falls within a range of 1 μm to 100 μm. 
     
     
         16 . The refrigerant compressor according to  claim 3 , wherein a total film thickness of the synthetic resin film is set to a value which falls within a range of 1 μm to 100 μm. 
     
     
         17 . The refrigerant compressor according to  claim 4 , wherein a total film thickness of the synthetic resin film is set to a value which falls within a range of 1 μm to 100 μm. 
     
     
         18 . A refrigeration appliance comprising a refrigerant circuit which is formed by annularly connecting the refrigerant compressor according to  claim 2 , a radiator, a pressure reduction device, and a heat absorber, by a pipe. 
     
     
         19 . A refrigeration appliance comprising a refrigerant circuit which is formed by annularly connecting the refrigerant compressor according to  claim 3 , a radiator, a pressure reduction device, and a heat absorber, by a pipe. 
     
     
         20 . A refrigeration appliance comprising a refrigerant circuit which is formed by annularly connecting the refrigerant compressor according to  claim 4 , a radiator, a pressure reduction device, and a heat absorber, by a pipe.