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Centrifugal compressor and turbocharger equipped with centrifugal compressor

A technology of centrifugal compressors and impellers, which is used in the lubrication of mechanical equipment, machines/engines, and engines, etc., can solve the problem of inability to compress air cooling, and achieve the effect of improving cooling performance

Active Publication Date: 2021-02-26
MITSUBISHI HEAVY IND ENGINE & TURBOCHARGER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in recent turbochargers in which the temperature of the discharge air from the centrifugal compressor tends to rise, there is a problem that the compressed air may not be cooled as expected in the centrifugal compressor.

Method used

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  • Centrifugal compressor and turbocharger equipped with centrifugal compressor
  • Centrifugal compressor and turbocharger equipped with centrifugal compressor
  • Centrifugal compressor and turbocharger equipped with centrifugal compressor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0076] Such as figure 1 As shown, the turbocharger 1 according to Embodiment 1 of the present disclosure includes a turbine 2 and a centrifugal compressor 3 . The turbine 2 includes a casing 20 and an impeller 21 provided rotatably inside the casing 20 .

[0077] The centrifugal compressor 3 includes: a housing 30 ; an impeller 31 provided rotatably inside the housing 30 ; a rotating shaft 32 connected to the impeller 31 at one end; and a bearing member 33 supporting the rotating shaft 32 in the housing 30 . The bearing member 33 includes: a thrust bearing 34 supporting the rotating shaft 32 in the axial direction of the rotating shaft 32 ; and a journal bearing 35 supporting the rotating shaft 32 in a direction perpendicular to the axial direction of the rotating shaft 32 . The other end of the rotating shaft 32 is connected to the impeller 21 of the turbine 2 . According to this configuration, when the impeller 21 rotates, the rotation is transmitted to the impeller 31 vi...

Embodiment approach 2

[0093] Next, a turbocharger according to Embodiment 2 will be described. In the turbocharger of the second embodiment, the structure of the oil circulation path 4 is changed from that of the first embodiment. In addition, in Embodiment 2, the same reference numerals are assigned to the same components as those in Embodiment 1, and detailed description thereof will be omitted.

[0094] Such as Figure 4 As shown, in the turbocharger 1 according to Embodiment 2 of the present disclosure, the oil supply source 60 (refer to image 3 ) directly supplies oil as lubricating oil to the lubricating oil passage 40 . The cooling oil passage 50 is configured to include, instead of the communicating portion 52 of the turbocharger 1 according to Embodiment 1, a communicating portion formed so as to surround the periphery of the scroll passage 38 in a direction perpendicular to the axial direction of the scroll passage 38 . Path 55 , one end of the communication path 55 communicates with ...

Embodiment approach 3

[0102] Next, a turbocharger according to Embodiment 3 will be described. In the turbocharger of the third embodiment, the structure of the oil circulation path 4 is changed from that of the first embodiment. In addition, in Embodiment 3, the same reference numerals are assigned to the same components as those in Embodiment 1, and detailed description thereof will be omitted.

[0103] Such as Image 6 As shown, in the turbocharger 1 according to Embodiment 3 of the present disclosure, the oil supply source 60 (refer to image 3 ) directly supplies oil as lubricating oil and cooling oil to the lubricating oil passage 40 and the cooling oil passage 50 , respectively. The lubricating oil path 40 is not branched into two branch paths on the way, but is configured to communicate only with the journal bearing 35 . Lubricating oil path 40 includes an oil supply path 44 communicating with thrust bearing 34 at one end and with annular portion 51 of cooling oil path 50 at the other en...

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Abstract

A centrifugal compressor equipped with: a housing; an impeller provided so as to be capable of rotating inside the housing; a rotary shaft connected to the impeller; and a bearing member for supporting the rotary shaft inside the housing. An oil circulation passage in which oil circulates is formed in the housing. The oil circulation passage includes a lubricating oil passage in which oil circulates as lubricating oil supplied to the bearing member, and a cooling oil passage in which oil circulates as cooling oil that exchanges heat with a fluid compressed by the impeller. The cooling oil passage is configured such that oil bypasses the bearing member and flows into the cooling oil passage as cooling oil.

Description

technical field [0001] The present disclosure relates to a centrifugal compressor and a turbocharger including the centrifugal compressor. Background technique [0002] Generally, the fluid compressed by the centrifugal compressor becomes high temperature. In the turbocharger, if the high-temperature air compressed by the centrifugal compressor is directly supplied to the engine, abnormalities such as knocking and pre-ignition may occur, thereby degrading the performance of the engine. In addition, the temperature of the discharge air from the centrifugal compressor of the turbocharger tends to increase year by year due to the introduction of EGR (Exhaust Gas Recirculation) and the application of lean burn / Miller cycle. Therefore, development of a technology for cooling compressed air in a centrifugal compressor of a turbocharger is underway. For example, Patent Document 1 discloses a turbocharger that is cooled by blowing lubricating oil for cooling from the bearing housi...

Claims

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Application Information

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IPC IPC(8): F04D29/58F02B39/00
CPCF05D2220/40F04D17/10F04D29/063F04D29/4206F02B37/00F02B39/14F02B39/005F04D29/5833F04D29/057F04D29/0513Y02T10/12F01M11/02F01M2011/021F04D29/056F04D29/284F04D29/582
Inventor 藤田豊段本洋辅冈信仁
Owner MITSUBISHI HEAVY IND ENGINE & TURBOCHARGER LTD
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