IMPELLER OF CENTRIFUGAL COMPRESSOR

• US 20120189454A1
• Filed: 08/10/2010
• Published: 07/26/2012
• Est. Priority Date: 10/07/2009
• Status: Active Grant

• Current Assignee: Mitsubishi Heavy Industries, Ltd.
• Original Assignee: Mitsubishi Heavy Industries, Ltd.
• Inventors: Tomita, Isao, Iwakiri, Kenichiro
• Granted Patent: US 9,033,667 B2
• Time in Patent Office: Days
• US Class Current: 416/223.R
• CPC Class Codes: F04D 29/284 for compressors
• CPC Class Codes: F04D 29/30 Vanes

Abstract

Providing an impeller of a centrifugal compressor, the impeller including, but not limited to: a plurality of full blades provided from the fluid inlet part to the fluid outlet part of the impeller, each full blade being arranged next to the adjacent full blade; a plurality of splitter blades provided on the hub surface, each splitter blade being provide between a full blade and the adjacent full blade from a location on a part way of the flow passage between the full blades to the fluid outlet part of the impeller, wherein the geometry of the flow entering part of the splitter blade is compatible with the complicated flow inside the compressor so that the evenly distributed flow rate distribution, the increased pressure ratio and the enhanced efficiency are achieved. An impeller of a centrifugal compressor, wherein, the leading edge blade angle θ in the tip end part of the flow entering front-end-part of the splitter blade 7 in the area of the higher height level from the hub surface is further inclined smoothly toward the blade suction surface side Sb of the full blade 5 in comparison with the inclination standard curve, the increased inclination angle becoming smoothly greater in response to the increase of the height level, and wherein, the leading edge blade angle θ in the hub side part of the flow entering front-end-part of the splitter blade 7 in the area of the lower height level from the hub surface is further inclined smoothly toward the blade pressure surface side Sa of the full blade 5 in comparison with the inclination standard curve, the decreased inclination angle toward minus side becoming smoothly smaller in response to the decrease of the height level.

Claims

1. An impeller of a centrifugal compressor, the impeller comprising:

a plurality of full blades provided on a hub surface from a working fluid inlet part of the impeller to a fluid outlet part of the impeller; and

a plurality of splitter blades, each splitter blade being provide between the full blade and the adjacent full blade from a middle of a flow passage formed between the full blades to the fluid outlet part of the impeller,

wherein a leading edge blade angle of a flow entering front-end-part of the splitter blade is varied depending on a height level from the hub surface in a height direction of the flow entering front-end-part,

further wherein a tip end part of the flow entering front-end-part of the splitter blade is inclined smoothly toward a blade suction surface side of the full blade, at a greater inclination angle than an inclination angle of other part of the flow entering front-end-part.

2. The impeller of the centrifugal compressor according to claim 1,

wherein the tip end part in the height direction of the flow entering front-end-part of the splitter blade is a part formed above a height level which is higher than or equal to approximately 70% of the total height from the hub surface, and

further wherein the inclination angle increases gradually up to a prescribed angle from a point above the height level of approximately 70% of the total height towards the tip end part.

3. An impeller of a centrifugal compressor, the impeller comprising:

a plurality of full blades provided on a hub surface from a working fluid inlet part of the impeller to a fluid outlet part of the impeller; and

a plurality of splitter blades, each splitter blade being provide between the full blade and the adjacent full blade from a middle of a flow passage formed between the full blades to the fluid outlet part of the impeller,

wherein a leading edge blade angle of a flow entering front-end-part of the splitter blade is varied depending on a height level from the hub surface in a height direction,

further wherein a hub side part of the flow entering front-end-part of the splitter blade is inclined smoothly toward a blade pressure surface side of the full blade, at a greater inclination angle than an inclination angle of other part of the flow entering front-end-part.

4. The impeller of the centrifugal compressor according to claim 3,

wherein the hub side part in the height direction of the flow entering front-end-part of the splitter blade is a part formed below a height level which is higher than or equal to approximately 70% of the total height from the hub surface, and

further wherein the inclination angle increases gradually up to a prescribed angle from a point below the height level of approximately 70% of the total height towards the hub surface.

5. An impeller of a centrifugal compressor, the impeller comprising:

a plurality of full blades provided on a hub surface from a working fluid inlet part of the impeller to a fluid outlet part of the impeller; and

a plurality of splitter blades, each splitter blade being provide between the full blade and the adjacent full blade from a middle of a flow passage formed between the full blades to the fluid outlet part of the impeller,

wherein a leading edge blade angle of a flow entering front-end-part of the splitter blade is varied depending on a height level from the hub surface in a height direction,

further wherein a tip end part in the height direction of the flow entering front-end-part of the splitter blade is inclined smoothly toward a blade suction surface side of the full blade, while a hub side part in the height direction of the flow entering front-end-part of the splitter blade is inclined smoothly toward a blade pressure surface side of the full blade.

6. The impeller of the centrifugal compressor according to claim 5,

wherein the tip end part of the flow entering front-end part is a part formed above a height level which is higher than or equal to approximately 70% of the total height from the hub surface, while the hub side part f the flow entering front-end part is a part formed below the height level.