Short-Shaft Electric Compressor

Abstract

The invention relates to an electric compressor ( 1 ) comprising a compression mechanism ( 3 ) rotated by a drive device that extends through a main casing ( 5 ) defining an internal volume ( 6 ) in which an electric motor ( 2 ) is installed. The electric motor comprises a stator ( 10 ) and a rotor ( 11 ) which extends at least partially on the outer periphery of the stator ( 10 ), said drive device comprising the rotor ( 11 ) solidly connected to a shaft ( 4 ) which extends through a plate ( 7 ) solidly connected to the main casing ( 2 ). The invention is characterised in that it includes a first rotation means ( 47 ) between the shaft ( 4 ) and the plate ( 7 ) and a second rotation means ( 51 ) between the drive device and the plate ( 7 ). The invention is suitable for motor vehicles.

1 . An electric compressor comprising a compression mechanism rotated by a drive device that extends through a main casing delimiting an internal volume inside which an electric motor is installed, the electric motor including a stator and a rotor, which extends at least partially on the outer periphery of the stator, said drive device including the rotor, solidly connected to a shaft, which extends through a plate solidly connected to the main casing, characterized in that it includes a first rotation means between the shaft and the plate and a second rotation means between the drive device and the plate. 
     
     
         2 . The compressor as claimed in  claim 1 , in which the first rotation means has an axis of rotation and the second rotation means extends in a plane, said plane and said axis extending angularly one in relation to the other. 
     
     
         3 . The compressor as claimed in  claim 1 , in which the plate includes an inner wall turned toward the electric motor and said rotor includes a support to which a multiplicity of permanent magnets is solidly connected, said second rotation means being interposed between the support and the wall. 
     
     
         4 . The compressor as claimed in  claim 1 , in which the plate includes an inner wall turned toward the electric motor and the shaft includes a disk, said second rotation means being interposed between said disk and the wall. 
     
     
         5 . The compressor as claimed in  claim 1 , in which the plate includes an outer wall turned toward the compression mechanism, said outer wall delimiting a housing for accommodating the first rotation means. 
     
     
         6 . The compressor as claimed in  claim 1 , in which the rotor includes a support to which a multiplicity of permanent magnets is solidly connected, said support includes an end wall solidly connected to the shaft and which extends radially in relation to the shaft, said end wall including at least one opening for the circulation of a coolant. 
     
     
         7 . The compressor as claimed in  claim 1 , in which the shaft incorporates a circumferential stop against which the first rotation means bears. 
     
     
         8 . The compressor as claimed in  claim 1 , in which the rotor includes a support to which a multiplicity of permanent magnets is solidly connected, said multiplicity of permanent magnets and the stator are offset, said stator being offset toward the compression mechanism. 
     
     
         9 . The compressor as claimed in  claim 1 , in which the first rotation means is a single-row ball bearing. 
     
     
         10 . The compressor as claimed in  claim 1 , in which the first rotation means is a double-row ball bearing. 
     
     
         11 . The compressor as claimed in  claim 1 , in which the second rotation means is a roller bearing. 
     
     
         12 . The compressor as claimed in  claim 1 , in which the second rotation means is a plain bearing. 
     
     
         13 . The compressor as claimed in  claim 1 , in which the electric motor separates the internal volume, delimiting a first chamber on one side and a second chamber on the other, said first chamber being supplied with coolant through an inlet made in the main casing, while the second chamber supplies the compression mechanism through a passage. 
     
     
         14 . The compressor as claimed in  claim 2 , in which the plate includes an inner wall turned toward the electric motor and said rotor includes a support to which a multiplicity of permanent magnets is solidly connected, said second rotation means being interposed between the support and the wall. 
     
     
         15 . The compressor as claimed in  claim 2 , in which the plate includes an inner wall turned toward the electric motor and the shaft includes a disk, said second rotation means being interposed between said disk and the wall. 
     
     
         16 . The compressor as claimed in  claim 2 , in which the plate includes an outer wall turned toward the compression mechanism, said outer wall delimiting a housing for accommodating the first rotation means. 
     
     
         17 . The compressor as claimed in  claim 3 , in which the plate includes an outer wall turned toward the compression mechanism, said outer wall delimiting a housing for accommodating the first rotation means. 
     
     
         18 . The compressor as claimed in  claim 4 , in which the plate includes an outer wall turned toward the compression mechanism, said outer wall delimiting a housing for accommodating the first rotation means.