Centrifugal compressor

Inactive Publication Date: 2012-06-14
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0031]According to the centrifugal compressor of the present invention, the centrifugal compressor is provided with: an impeller which includes a plurality of blades fixed radially to a rotating shaft; a resin housing which is arranged around the impeller and which is made of resin. Between the impeller and the resin housing, a flow path for a gas to be compressed is formed by an outer periphery of the impeller and an inner wall of a path forming section of the resin housing, the gas flowing in the flow path from an axial direction to a radial direction of the impeller. The inner wall of the path forming section of the resin housing is carved to form a depression in which an annular shroud is provided, the annular sh

Problems solved by technology

By this, the clearance T becomes wider and the gas leaks from the w

Method used

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first embodiment

[0045]A first embodiment of a centrifugal compressor to which the present invention is applied is explained in reference to FIG. 1. In FIG. 1, a rotating shaft 12 is arranged in a center of a resin housing 20, and an impeller 14 having a plurality of blades 16 fixed radially is fixed to an outer periphery of the rotating shaft 12. A hub face 18 of the impeller 14 curves from an inlet side to an outlet side in a flow direction of a gas to be compressed (a direction indicated with an arrow a) from an axial direction to a radial direction of the rotating shaft 12. The resin housing 20 includes a volute section 20a which forms a volute part s and a path forming section 20b which forms a flow path c for the gas to be compressed.

[0046]The outer edge of the blade forms a curved profile 16a. Along the curved profile 16a, an inner wall 20b1 of the path forming section 20b of the resin housing 20 is formed. The inner wall 20b1 is carved to form a depression 20b2 in which an annular shroud is ...

second embodiment

[0052]A second embodiment of the centrifugal compressor to which the present invention is applied is explained in reference to FIG. 2. In the second embodiment, as shown in FIG. 2, the downstream end 22a of the annular shroud 22 has two bending sections. The annular shroud 22 bends at a first bending section to extend to a position where the downstream end comes in contact with the wall 32 of the bearing housing 30 and bends at a second bending section to form a flange part 22a1. The wall 32 is formed with a depression 32a in which the flange part 22a1 is fitted. The flange part 22a1 is connected to the depression 32a by a bolt 40.

[0053]The flange part 22a1 is formed partially around the impeller 14. Thus, the downstream end 22a of the shroud 22 does not block the diffuser d or interfere with the flow of the gas in the diffuser. The rest of the structure is substantially the same as that of the first embodiment. The same parts are indicated by the same reference numerals.

[0054]Accor...

third embodiment

[0055]Next, a third embodiment in which the present invention is applied to a centrifugal compressor is explained in reference to FIG. 3. In the third embodiment, the depression 20b2 carved in the inner wall 20b1 of the path forming section 20b of the resin housing 20, is carved to form a groove 52. In the groove 52, a rubber or resin seal ring 50 is inserted. The rest of the structure is substantially the same as that of the second embodiment.

[0056]According to the third embodiment, even when the resin housing 20 thermally deforms, creating a gap between the depression 20b2 and a rear face of the annular shroud 22, it is possible to prevent the entry of the gas between the depression 20b2 and the annular shroud 22 by means of the seal ring 50. Therefore, the compression efficiency of the compressor does not decrease.

[0057]At an inlet of the impeller 14, the temperature of the gas is approximately the same as the ambient air and is low. At the inlet of the impeller, the temperatures...

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Abstract

A centrifugal compressor is equipped with a resin housing, that is made in a manner such that compression efficiency is not lost and merits such as weight and cost reduction are not cancelled out. The turbo charger housing comprises a volute section, a channel formation section, and an impeller that is fixed in the center of the channel formation section to a rotating shaft. An annular shroud is disposed in a recess formed on the inner wall of the channel formation section. The annular shroud forms the outer walls of a channel and a diffuser for compressed gas. The edge of the annular shroud spaced from a partition wall, which forms a portion of a bearing housing. If the resin housing undergoes thermal deformation, the dimensions of a gap between the annular shroud and the curved profile of a blade is maintained.

Description

TECHNICAL FIELD[0001]The present invention relates to a centrifugal compressor provided with a housing made of resin which is used in a turbocharger or the like.BACKGROUND ART[0002]A turbocharger installed in a vehicle or the like, drives a compressor by a exhaust turbine which is driven by energy of exhaust gas, compresses intake air in the compressor and supplies the compressed air to an engine. This type of turbocharger is provided with a bearing housing between a turbine housing of the exhaust turbine and a compressor housing for a turbo compressor. The bearing housing movably supports the rotating shaft rotatably. On the rotating shaft arranged through the bearing housing, an impeller of the turbo compressor and a wheel of the exhaust turbine are fixed.[0003]The bearing housing houses a bearing mechanism for movably supporting the rotating shaft rotatably. Between the bearing housing and the compressor housing, a seal wall is interposed to form a flow path for gas which is encl...

Claims

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Application Information

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IPC IPC(8): F01D1/02
CPCF04D29/023F04D29/441F04D29/4206F04D29/162F04D29/4213F04D29/685F05D2220/40F05D2250/52F05D2300/43F05D2300/502Y10S415/00
Inventor IBARAKI, SEIICHITOMITA, ISAOJINNAI, YASUAKIMIKOGAMI, TAKASHITOJO, MASAKIKITADA, AKIO
Owner MITSUBISHI HEAVY IND LTD
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