Reciprocating piston compressor for refrigerant

Abstract

In order to increase the efficiency, in respect of the quantity of refrigerant to be compressed, of a reciprocating piston compressor for refrigerant, comprising a compressor housing having at least one compressor stage that has at least one cylinder unit, wherein a piston is movably arranged in the cylinder unit, a cylinder drive that is arranged in the compressor housing, for the at least one piston, a valve plate that closes off a cylinder chamber and is provided with at least one suction valve which, for its part, has a suction opening, arranged in the valve plate and closable by a suction vane, and has at least one outlet valve with an outlet opening, wherein the at least one suction valve and the at least one outlet valve are associated with the respective cylinder chamber, and a cylinder head that is arranged on an opposite side of the valve plate to the cylinder chamber, it is proposed that the valve plate should have, on its side facing the cylinder chamber, a recess, which is arranged inside an external contour of an abutment face of the suction vane that is associated with the suction opening and which extends from the suction opening and is open toward this abutment face.

1 . A reciprocating piston compressor for refrigerant, comprising a compressor housing having at least one compressor stage that has at least one cylinder unit, which itself comprises at least one cylinder chamber, wherein a piston is movably arranged in the cylinder unit, a cylinder drive that is arranged in the compressor housing, for the at least one piston, a valve plate that closes off the cylinder chamber and is provided with at least one suction valve which, for its part, has a suction opening, arranged in the valve plate and closable by a suction vane, and has at least one outlet valve with an outlet opening, wherein the at least one suction valve and the at least one outlet valve are associated with the respective cylinder chamber, and a cylinder head that is arranged on an opposite side of the valve plate to the cylinder chamber, the valve plate has, on its side facing the cylinder chamber, a recess, which is arranged inside an external contour ( 262 ) of an abutment face ( 256 ) of the suction vane ( 246 ) that is associated with the suction opening ( 242 ) and which extends from the suction opening ( 242 ) and is open toward this abutment face ( 256 ). 
     
     
         2 . The reciprocating piston compressor as claimed in  claim 1 , wherein the recess has a recess base that is set back in relation to the abutment face of the suction vane. 
     
     
         3 . The reciprocating piston compressor as claimed in  claim 2 , wherein the recess base extends into the suction opening. 
     
     
         4 . The reciprocating piston compressor as claimed in  claim 1 , wherein the recess, starting from the abutment face of the suction vane, has a depth that is greater than a thickness of a lubricant film that is formed between the suction vane and the abutment face when the suction opening is sealed off. 
     
     
         5 . The reciprocating piston compressor as claimed in  claim 1 , wherein, starting from the abutment face of the suction vane, the depth of the recess is at least 0.2 mm, in particular at least 0.3 mm. 
     
     
         6 . The reciprocating piston compressor as claimed in  claim 1 , wherein, starting from the abutment face of the suction vane, the depth of the recess is at most 40%, in particular at most 50%, of the thickness of the valve plate. 
     
     
         7 . The reciprocating piston compressor as claimed in  claim 1 , wherein the recess runs at a spacing from the external contour of the abutment face of the suction vane. 
     
     
         8 . The reciprocating piston compressor as claimed in  claim 1 , wherein the recess and the suction opening are surrounded by a contact face for the suction vane that runs peripherally all the way around them. 
     
     
         9 . The reciprocating piston compressor as claimed in  claim 1 , wherein, on its side facing the suction vane and open toward the abutment face of the suction vane, the recess has a surface area that is at least 10%, preferably at least 20%, even more preferably at least 50% of a cross-sectional surface area of the suction opening. 
     
     
         10 . The reciprocating piston compressor as claimed in  claim 1 , wherein the recess extends from the suction opening in the direction of a suction vane foot. 
     
     
         11 . The reciprocating piston compressor as claimed in  claim 1 , wherein the recess extends from the suction opening in the direction of a suction vane end. 
     
     
         12 . The reciprocating piston compressor as claimed in  claim 1 , wherein the recess extends from the suction opening over a region of the valve plate that, on the side with the cylinder head, abuts against a foot region of the cylinder head. 
     
     
         13 . The reciprocating piston compressor as claimed in  claim 1 , wherein the recess extends from the suction opening over a region of the valve plate that delimits an outlet chamber on the side with the cylinder head. 
     
     
         14 . The reciprocating piston compressor as claimed in  claim 1 , wherein the cylinder head is provided with a connector for refrigerant that is to be drawn in. 
     
     
         15 . The reciprocating piston compressor as claimed in  claim 14 , wherein a suction duct extends through the cylinder head from the connector for the refrigerant that is to be compressed as far as the suction opening. 
     
     
         16 . The reciprocating piston compressor as claimed in  claim 15 , wherein the suction duct has a duct cross section that corresponds to at most twice, even more preferably at most 1.5 times, a cross-sectional surface area of flow of the suction opening. 
     
     
         17 . The reciprocating piston compressor as claimed in  claim 14 , wherein a suction duct that leads to a plurality of suction openings has a cross-sectional surface area of flow that corresponds to at most twice, even more preferably at most 1.5 times, the sum of the cross-sectional surface areas of flow of the suction ducts. 
     
     
         18 . The reciprocating piston compressor as claimed in  claim 15 , wherein the suction duct is shaped within the cylinder head. 
     
     
         19 . The reciprocating piston compressor as claimed in  claim 15 , wherein the suction duct is formed substantially in an insert that is inserted into the cylinder head. 
     
     
         20 . A valve plate for a reciprocating piston compressor comprising a compressor housing having at least one compressor stage that has at least one cylinder unit, which itself comprises at least one cylinder chamber, wherein the valve plate closes off the cylinder chamber and carries a cylinder head and is provided with at least one suction valve which, for its part, has a suction opening, arranged in the valve plate and closable by a suction vane, and is provided with at least one outlet valve with an outlet opening, wherein the at least one suction valve and the at least one outlet valve are associated with the respective cylinder chamber, the valve plate has, on its side facing the cylinder chamber, a recess, which is arranged inside an external contour of an abutment face of the suction vane that is associated with the suction opening and which extends from the suction opening and is open toward this abutment face. 
     
     
         21 . The valve plate as claimed in  claim 20 , wherein the recess has a recess base that is set back in relation to the abutment face of the suction vane. 
     
     
         22 . The valve plate as claimed in  claim 21 , wherein the recess base extends into the suction opening. 
     
     
         23 . The valve plate as claimed in  claim 20 , wherein the recess, starting from the abutment face of the suction vane, has a depth that is greater than a thickness of a lubricant film that is formed between the suction vane and the abutment face when the suction opening is sealed off. 
     
     
         24 . The valve plate as claimed in  claim 20 , wherein, starting from the abutment face of the suction vane, the depth of the recess is at least 0.2 mm, in particular at least 0.3 mm. 
     
     
         25 . The valve plate as claimed in  claim 20 , wherein, starting from the abutment face of the suction vane, the depth of the recess is at most 40%, in particular at most 50%, of the thickness of the valve plate. 
     
     
         26 . The valve plate as claimed in  claim 20 , wherein the recess runs at a spacing from the external contour of the abutment face of the suction vane. 
     
     
         27 . The valve plate as claimed in  claim 20 , wherein the recess and the suction opening are surrounded by a contact face for the suction vane that runs peripherally all the way around them. 
     
     
         28 . The valve plate as claimed in  claim 20 , wherein, on its side facing the suction vane and open toward the abutment face of the suction vane, the recess has a surface area that is at least 10%, preferably at least 20%, even more preferably at least 50% of a cross-sectional surface area of the suction opening. 
     
     
         29 . The valve plate as claimed in  claim 20 , wherein the recess extends from the suction opening in the direction of a suction vane foot. 
     
     
         30 . The valve plate as claimed in  claim 20 , wherein the recess extends from the suction opening in the direction of a suction vane end. 
     
     
         31 . The valve plate as claimed in  claim 20 , wherein the recess extends from the suction opening over a region of the valve plate that, on the side with the cylinder head, abuts against a foot region of the cylinder head. 
     
     
         32 . The valve plate as claimed in  claim 20 , wherein the recess extends from the suction opening over a region of the valve plate that delimits an outlet chamber on the side with the cylinder head.