Compressor

Abstract

The invention relates to a compressor for refrigerant having a compressor housing, said compressor housing being provided with a suction inlet and a pressure outlet, said compressor comprising a compression unit, arranged in a compression housing section of said compressor housing and an electric motor arranged in a motor housing section of said compressor housing, said electric motor comprising a stator arranged within a stator receiving sleeve of said motor housing section and a rotor surrounded by said stator and arranged on a drive shaft of said electric motor for rotation about an axis of rotation together with said drive shaft, said stator comprising a stator core having a stack of laminations and extending parallel to said axis of rotation from a first front side to a second front side, said stator having windings extending through said stator core and forming end windings arranged in front of said front surfaces, and a channel for guiding at least a portion of said refrigerant entering through said suction inlet along an outer side of said stator before entering said compression unit.

1 . Compressor for refrigerant having a compressor housing, comprising a motor housing section and a compression section, said compressor housing being provided with a suction inlet and a pressure outlet, said compressor comprising a compression unit, arranged in the compression section and an electric motor arranged in a receptacle provided by a motor housing sleeve of said motor housing section, said motor housing sleeve being a integral segment of said motor housing section and having an inner cylindrical surface and being provided on its side opposite to said compression section by a cover releasable connected to said motor housing sleeve, said electric motor comprising a stator arranged within the receptacle of said motor housing sleeve and a rotor surrounded by said stator and arranged on a drive shaft of said electric motor for rotation about an axis of rotation together with said drive shaft, said drive shaft being mounted rotatably about an axis of rotation by a bearing system arranged between said compression unit and said electric motor and mounted in a bearing support integral with said compressor housing, said stator comprising a stator core having a stack of laminations and extending parallel to said axis of rotation from a first front side to a second front side, said stator having windings extending through said stator core and forming end windings arranged in front of said front sides, the stator core is provided with at least two stator support elements integrally manufactured as one piece with laminations forming said stator core and extending in radial direction of said axis of rotation beyond an outer surface of said stator core for support of said stator on the inner cylindrical surface of said motor housing sleeve without a weld therebetween, said at least two stator support elements together with said inner sleeve surface and said outer surface of said stator core forming at least two channels for guiding at least a portion of said refrigerant entering through said suction inlet along an outer side of said stator before entering said compression unit, an angular span of each of the at least two channels for guiding said outer flow of said refrigerant being greater than a radially outermost angular span of any individual one of the at least two stator support elements, and wherein said at least two flow guiding channels extend along said stator support elements of said electric motor and guide said outer flow along said stator support elements of said electric motor and the stator core is rotationally fixed to the motor housing sleeve at a predetermined angular orientation. 
     
     
         2 . Compressor in accordance with  claim 1 , wherein said end windings of said stator and an outer surface of said stator extending between said end windings of said stator, and in an operative state an inner flow of refrigerant flows along an inner surface of the end windings and between the end windings through a gap between the stator and the rotor. 
     
     
         3 . Compressor in accordance with  claim 1 , wherein the outer surfaces of said end windings are arranged more or less flush with said outer surface of said stator core. 
     
     
         4 . Compressor in accordance with  claim 1 , wherein said outer surface of said stator core is flush with said outer surfaces of said end windings. 
     
     
         5 . Compressor in accordance with  claim 1 , wherein said stator support elements are provided with radially outer support surfaces abutting on said inner sleeve surface of said housing sleeve. 
     
     
         6 . Compressor in accordance with  claim 1 , wherein said stator support elements are formed by protrusions of laminations of said stator core extending beyond said outer surface of said stator core. 
     
     
         7 . Compressor in accordance with  claim 1 , wherein the stator support elements extend only parallel to said axis of rotation. 
     
     
         8 . Compressor in accordance with  claim 1 , wherein said stator support elements are arranged and fixed on an outer contour of said stator core. 
     
     
         9 . Compressor in accordance with  claim 1 , wherein the stator support elements are arranged about said axis or rotation at identical angular distances from each other. 
     
     
         10 . Compressor in accordance with  claim 1 , wherein more than two stator support elements are provided. 
     
     
         11 . Compressor for refrigerant having a compressor housing, comprising a motor housing section and a compression section, said compressor housing being provided with a suction inlet and a pressure outlet, said compressor comprising a compression unit, arranged in the compression section of said compressor housing and an electric motor arranged in the motor housing section of said compressor housing, said electric motor comprising a stator arranged within a receptacle of a motor housing sleeve of said motor housing section and a rotor surrounded by said stator and arranged on a compressor drive shaft of said electric motor for rotation about an axis of rotation together with said compressor drive shaft, said compressor drive shaft extending from said rotor to the compression unit in order to drive one or more compression elements and said compressor drive shaft is mounted rotatably about the axis of rotation by a bearing system arranged between said compression unit and said electric motor and mounted in a bearing support integral with said compressor housing, a rotor supporting section of said drive shaft is merely supported by said bearing system and its free end arranged on a side of said rotor supporting section opposite to said bearing system is arranged free of support with respect to the compressor housing, said stator comprising a stator core having a stack of laminations and extending parallel to said axis of rotation from a first front side to a second front side, said stator having windings extending through said stator core and forming end windings arranged in front of said front surfaces, the stator core is provided with at least two stator support elements fixed to said stator core and extending in radial direction of said axis of rotation beyond an outer surface of said stator core for support of said stator on an inner cylindrical sleeve surface of said motor housing sleeve, and wherein a flow guiding channel for guiding at least a portion of said refrigerant entering through said suction inlet as an outer flow of refrigerant along an outer side of said stator before entering said compression unit is provided, said flow of refrigerant through said flow guiding channel extends along said stator support elements of said electric motor. 
     
     
         12 . Compressor in accordance with  claim 11 , wherein said motor housing sleeve is an integral section of the motor housing section. 
     
     
         13 . Compressor in accordance with  claim 11 , wherein said outer side of said stator is provided by outer surface of said end windings of said stator and an outer surface of said stator extending between said end windings of said stator, and that said flow of refrigerant through an inner flow of refrigerant is flowing along an inner surface of the respective end windings and between the end windings through a gap between stator and rotor. 
     
     
         14 . Compressor in accordance with  claim 11 , wherein said inner sleeve surface is a cylindrical surface. 
     
     
         15 . Compressor for refrigerant having a compressor housing, said compressor housing being provided with a suction inlet and a pressure outlet, said compressor comprising a compression unit, arranged in a compression section of said compressor housing and an electric motor arranged in a motor housing section of said compressor housing, said electric motor comprising a stator arranged within a motor housing sleeve being an integral segment of said motor housing section and a rotor surrounded by said stator and arranged on a drive shaft of said electric motor for rotation about an axis of rotation together with said drive shaft, said stator comprising a stator core having a stack of laminations and extending parallel to said axis of rotation from a first front side to a second front side, said stator having windings extending through said stator core and forming end windings arranged in front of said front sides, the stator core is provided with at least two stator support elements fixed to said stator core and extending in radial direction of said axis of rotation beyond an outer surface of said stator core for supporting of said stator on an inner sleeve surface of said motor housing sleeve, said at least two stator support elements together with said inner sleeve surface and said outer surface of said stator core forming a plurality of flow guiding channels that extend along said stator support elements of said electric motor and for guiding at least a portion of said refrigerant entering through said suction inlet along an outer side of said stator before entering said compression unit, and further comprising a gap between the stator and the rotor for providing an inner flow of refrigerant flow along an inner surface of the end windings; and wherein the stator core is rotationally fixed to the motor housing sleeve at a predetermined angular orientation in a contact abutting manner between said stator support element and said inner sleeve surface. 
     
     
         16 . Compressor for refrigerant having a compressor housing, said compressor housing being provided with a suction inlet and a pressure outlet, said compressor comprising a compression unit, arranged in a compression section of said compressor housing and an electric motor arranged in a motor housing section of said compressor housing, said electric motor comprising a stator arranged within a motor housing sleeve of said motor housing section said motor housing sleeve being an integral segment of said motor housing section and a rotor surrounded by said stator and arranged on a drive shaft of said electric motor for rotation about an axis of rotation together with said drive shaft, said stator comprising a stator core having a stack of laminations and extending parallel to said axis of rotation from a first front side to a second front side, said stator having windings extending through said stator core and forming end windings arranged in front of said front sides, and a channel for guiding at least a portion of said refrigerant entering through said suction inlet along an outer side of said stator before entering said compression unit, wherein the stator core is provided with at least two stator support elements fixed to said stator core and extending in radial direction of said axis of rotation beyond an outer surface of said stator core for support of said stator on an inner sleeve surface of said motor housing sleeve without a weld therebetween, said at least two stator support elements together with said inner sleeve surface and said outer surface of said stator core forming a plurality of flow guiding channels that extend along said stator support elements of said electric motor, for guiding at least a portion of said refrigerant; and wherein the stator core is rotationally fixed to the motor housing sleeve at a predetermined angular orientation; and
 further comprising surface contact abutment at an interface between the stator support elements and the motor housing sleeve to provide for the predetermined angular orientation, wherein the surface contact abutment rotationally fixes the stator relative to the motor housing sleeve.   
     
     
         17 . Compressor in accordance with  claim 15 , wherein each of the flow guiding channels define a channel depth radially between said inner sleeve surface and said outer surface of said stator core, wherein the channel depth remains substantially constant over a circumferential span for each of the flow guiding channels as between respective pairs of the least two stator support elements. 
     
     
         18 . Compressor in accordance with  claim 16 , wherein the at least two stator support elements are fixed to said stator core by being integrally manufactured as one piece with laminations forming said stator core. 
     
     
         19 . Compressor in accordance with  claim 16 , wherein each of the flow guiding channels define a channel depth radially between said inner sleeve surface and said outer surface of said stator core, wherein the channel depth remains substantially constant over a circumferential span for each of the flow guiding channels as between respective pairs of the at least two stator support elements. 
     
     
         20 . Compressor according to  claim 16 , wherein the surface contact abutment comprises a tongue and groove interlocking at the interface. 
     
     
         21 . Compressor according to  claim 16 , wherein the surface contact abutment comprises a friction fit at the interface. 
     
     
         22 . Compressor according to  claim 16 , wherein the surface contact abutment comprises a press fit at the interface.