Housing for centrifugal compressor, centrifugal compressor, and method for producing a housing for a centrifugal compressor
A housing 1 for a centrifugal compressor 40 with a centrifugal impeller 42 has a front cover 2 . The front cover 2 defines a central axis 6 and has an axially oriented inlet 8 , a diffuser 10 in fluid connection with the inlet 8 , a collector 12 in fluid connection with the diffuser 10 , and a rear cover opening which is opposite of the inlet 8 and designed to sealingly receive a rear cover 4 . The diffuser has a first diffuser wall 30 and the collector has a collector wall 15 . The front cover 2 is made of a three-dimensionally shaped base 22 and a separate disk-shaped diffuser wall part 24 which is attached to the three-dimensionally shaped base 22 for forming the diffuser 10 and the collector 12.
1 . A housing for a centrifugal compressor, comprising:
a front cover, and
a separate diffuser wall part which is disk-shaped and comprises a diffuser side and a collector side opposite of the diffuser side,
wherein the front cover defines a central axis and comprises an axially oriented inlet, a first diffuser wall of a diffuser, wherein the diffuser is in fluid connection with the inlet, a collector wall of a collector, which wherein the collector is in fluid connection with the diffuser, an outlet in fluid connection with the collector, and a rear cover opening which is opposite of the inlet and designed to sealingly receive a rear cover, wherein the rear cover comprises a second diffuser wall of the diffuser, and wherein the second diffuser wall faces the first diffuser wall after assembly of the rear cover in the rear cover opening, and
wherein the front cover comprises a three-dimensionally shaped base that has a groove and the separate diffuser wall part, and wherein the separate diffuser wall part has an inner opening with a circumference that corresponds to the groove of the three-dimensionally shaped base and wherein the inner opening of the separate diffuser wall part is received in the groove and is attached by shrink-fit to the three-dimensionally shaped base, and the first diffuser wall comprises the diffuser side of the separate diffuser wall part and the collector wall comprises the collector side of the separate diffuser wall part.
2 . The housing for the centrifugal compressor according to claim 1 , wherein the separate diffuser wall part comprises a bevelled circumferential outer edge.
3 . The housing for the centrifugal compressor according to claim 1 , wherein the groove of the three-dimensionally shaped base comprises an annular groove.
4 . The housing for the centrifugal compressor according to claim 1 , wherein the rear cover is sealingly attached to the front cover.
5 . The centrifugal compressor, comprising:
the housing according to claim 1 , and a centrifugal impeller mounted in the housing for rotation about the central axis of the front cover of the housing.
6 . The centrifugal compressor according to claim 5 , wherein a drive shaft of the centrifugal impeller is drivingly connected to a driving mechanism.
7 . The centrifugal compressor according to claim 6 , wherein the driving mechanism is chosen from the group consisting of: a turbine for forming a turbocharger and a motor.
8 . The centrifugal compressor according to claim 5 , wherein the separate diffuser wall part is attached to the three-dimensionally shaped base with the shrink-fit by heat expansion of the separate diffuser wall part followed by cooling.
9 . The centrifugal compressor according to claim 8 , wherein a drive shaft of the centrifugal impeller is drivingly connected to a driving mechanism.
10 . The housing for the centrifugal compressor according to claim 1 , wherein the separate diffuser wall part is attached to the three-dimensionally shaped base with the shrink-fit by heat expansion of the separate diffuser wall part followed by cooling.
11 . The housing for the centrifugal compressor according to claim 1 , the disk-shaped diffuser plate comprises a central opening with an edge, the groove has two radially extending groove walls, the radially extending groove wall which is facing the rear cover opening is so low that it enables the shrink-fitting of the separate diffuser wall part by moving the central opening of the disk-shaped diffuser plate in axial direction over the radially extending groove wall which is facing the rear cover opening, and the radially extending groove wall which is facing the rear cover opening provides a form-fit connection with the edge of the central opening of the disk-shaped diffuser plate after the separate diffuser wall part and the three-dimensionally shaped base regain their original dimensions.
12 . A method for producing a housing for a centrifugal compressor, comprising the following steps:
providing a three-dimensionally shaped base for a front cover,
providing a separate diffuser wall part, which is disk-shaped and comprises a diffuser side and a collector side opposite of the diffuser side, and
shrink-fitting the separate diffuser wall part to the three-dimensionally shaped base for forming the front cover, wherein the front cover defines a central axis and comprises an axially oriented inlet, a first diffuser wall of a diffuser, wherein the diffuser is in fluid connection with the inlet, a collector wall of a collector, wherein the collector is in fluid connection with the diffuser, an outlet in fluid connection with the collector, and a rear cover opening which is opposite of the inlet and designed to sealingly receive a rear cover, wherein the rear cover comprises a second diffuser wall of the diffuser, wherein the second diffuser wall faces the first diffuser wall after assembly of the rear cover in the rear cover opening, and wherein the attaching of the separate diffuser wall part to the three-dimensionally shaped base completes the first diffuser wall with the diffuser side of the diffuser wall part and completes the collector wall with the collector side of the separate diffuser wall part.
13 . The method according to claim 8 , wherein the step of providing the three-dimensionally shaped base for the front cover comprises machining the three-dimensionally shaped base out of a piece of raw material.
14 . The method according to claim 13 , wherein the step of providing the three-dimensionally shaped base for the front cover comprises milling the three-dimensionally shaped base out of the piece of raw material with a 5-axis milling machine.
15 . The method according to claim 12 , further comprising the step of sealingly attaching the rear cover to the rear cover opening.
16 . The method according to claim 12 , wherein the step of providing the separate diffuser wall part comprises turning, cutting, or milling the separate diffuser wall part out of a sheet material.
17 . The method of claim 12 , wherein the separate diffuser wall part has an edge, and the separate diffuser wall part is attached to the three-dimensionally shaped base by seating the edge of the separate diffuser wall part into a groove formed in the front cover and the shrink-fitting by heat expansion followed by cooling.
18 . The method of claim 17 , wherein the groove of the three-dimensionally shaped base comprises an annular groove.
19 . The method of claim 12 , wherein the three-dimensionally shaped base has a groove and the separate diffuser wall part has an inner opening with a circumference that corresponds to the groove of the three-dimensionally shaped base, and wherein the inner opening of the separate diffuser wall part is received in the groove and is attached by the shrink-fit to the three-dimensionally shaped base.