Impeller, rotor comprising same, and impeller manufacturing method

Patent metadata

Field	Value
Publication number	US-9611742-B2
Application number	US-201213976108-A
Country	US
Kind code	B2
Filing date	Feb 17, 2012
Priority date	Feb 24, 2011
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

An impeller is formed of two parts, i.e., an inner peripheral side part and an outer peripheral side part. The inner peripheral side part is molded in a cylindrical shape. The outer peripheral side part is formed by integrally molding an annular disc externally fitted to an outer peripheral surface of the inner peripheral side part, a plurality of blades provided at an interval in a circumferential direction on a surface that faces the other side in the axis line direction of the annular disc and forming a flow path extending in a radial direction, and a cover covering the plurality of blades from the other side in the axis line direction and having an insertion hole to which the inner peripheral side part is inserted in the axis line direction at an interval in a radial direction.

First claim

The invention claimed is:

1. A rotor comprising:
a rotating shaft;
an inner peripheral side part that forms a first portion of a disc, and that has a cylindrical shape around an axis line; and
an outer peripheral side part that includes an annular disc, a plurality of blades and a cover, wherein
an outer peripheral surface of the inner peripheral side part includes:
a small-diameter portion which is formed with an end portion at a first side of the inner peripheral side part in a direction of the axis line on the outer peripheral surface;
an enlarged-diameter portion which is continuous with the small-diameter portion and extends toward a second side of the inner peripheral side part in the axis line direction from the small-diameter portion and which has a diameter that gradually increases toward the second side in the axis line direction; and
a large-diameter portion which is continuous with the enlarged-diameter portion and extends toward the second side in the axis line direction from the enlarged-diameter portion and which is formed with an end portion at the second side in the axis line direction on the outer peripheral surface,

the annular disc forms a second portion of the disc and is capable of externally fitted to the large-diameter portion of the inner peripheral side part,
the blades are provided at intervals in a circumferential direction on a surface of the annular disc that faces the first side in the axis line direction and form a flow path extending in a radial direction, and
the cover covers the plurality of blades from the first side in the axis line direction, and has an insertion hole into which the inner peripheral side part is inserted in the axis line direction at an interval in a radial direction,
the inner peripheral side part is integrally molded with the rotating shaft,
in a cross section of the impeller that includes the axis line, the flow path is formed in a curved shape, and
the outer peripheral side part is configured such that the annular disc, the blades and the cover are integrally molded.

2. An impeller comprising:
an inner peripheral side part that forms a first portion of a disc, and that has a cylindrical shape around an axis line; and
an outer peripheral side part that includes an annular disc, a plurality of blades and a cover, wherein
an outer peripheral surface of the inner peripheral side part includes:
a small-diameter portion which is formed with an end portion at a first side of the inner peripheral side part in a direction of the axis line on the outer peripheral surface;
an enlarged-diameter portion which is continuous with the small-diameter portion and extends toward a second side of the inner peripheral side part in the axis line direction from the small-diameter portion and which has a diameter that gradually increases toward the second side in the axis line direction; and
a large-diameter portion which is continuous with the enlarged-diameter portion and extends toward the second side in the axis line direction from the enlarged-diameter portion and which is formed with an end portion at the second side in the axis line direction on the outer peripheral surface,

the annular disc forms a second portion of the disc and is externally fitted to the large-diameter portion of the inner peripheral side part at a fitting portion,
the blades are provided at intervals in a circumferential direction on a surface of the annular disc that faces the first side in the axis line direction and form a flow path extending in a radial direction,
the cover covers the plurality of blades from the first side in the axis line direction, and has an insertion hole into which the inner peripheral side part is inserted in the axis line direction at an interval in a radial direction,
the disc of the impeller is configured by the inner peripheral side part and the annular disc,
in a cross section of the impeller that includes the axis line, the flow path is formed in a curved shape, and
the outer peripheral side part is configured such that the annular disc, the blades and the cover are integrally molded.

3. The impeller according to claim 2 , wherein
the annular disc is externally fitted to the large-diameter portion of the inner peripheral side part through shrink fitting.

4. The impeller according to claim 3 , wherein:
an edge portion rising in a cylindrical shape from an inner side in a radial direction of the cover to the first side in the axis line direction is provided in the cover, and
an introduction portion of a fluid to the flow path is formed of the edge portion and the small-diameter portion of the inner peripheral side part.

5. The impeller according to claim 2 , wherein
at least a portion of the fitting portion is formed in a step shape.

6. The impeller according to claim 2 , wherein
at least a portion of the fitting portion is formed in a tapered shape.

7. The impeller according to claim 2 , further comprising
a key member that fixes the inner peripheral side part and the outer peripheral side part to each other, the key member being interposed in the fitting portion.

8. A rotor comprising:
an impeller according to claim 2 ; and
a rotating shaft to which a portion at the first side in the axis line direction of an inner peripheral surface of the inner peripheral side part of the impeller is externally fitted.

9. The rotor according to claim 8 , wherein
the inner peripheral side part is externally fitted to the rotating shaft through shrink fitting.

10. A method of manufacturing an impeller comprising an inner peripheral side part and an outer peripheral side part, the method comprising the steps of:
molding the inner peripheral side part that is in a cylindrical shape around an axis line, and forming a first portion of a disc as the inner peripheral side part, wherein an outer peripheral surface of the inner peripheral side part includes:
a small-diameter portion which is formed with an end portion at a first side of the inner peripheral side part in a direction of the axis line on the outer peripheral surface;
an enlarged-diameter portion which is continuous with the small-diameter portion and extends toward a second side of the inner peripheral side part in the axis line direction from the small-diameter portion and which has a diameter that gradually increases toward the second side in the axis line direction; and
a large-diameter portion which is continuous with the enlarged-diameter portion and extends toward the second side in the axis line direction from the enlarged-diameter portion and which is formed with an end portion at the second side in the axis line direction on the outer peripheral surface;

integrally molding the outer peripheral side part including an annular disc, a plurality of blades and a cover, the annular disc forming a second portion of the disc and being capable of externally fitting to the large-diameter portion of the inner peripheral side part, the blades being provided at intervals in a circumferential direction on a surface of the annular disk that faces the first side in the axis line direction and forming a flow path extending in a radial direction, and the cover covering the plurality of blades from the first side in the axis line direction and having an insertion hole into which the inner peripheral side part is inserted in the axis line direction at an interval in the radial direction;
forming the flow path in a curved shape in a cross section of the impeller that includes the axis line; and
fixing and integrating the inner peripheral side part and the outer peripheral side part by externally fitting the annular disc to a portion of the inner peripheral side part at the first side in

Assignees

• Nakaniwa Akihiro
• Shinohara Hitoshi
• Mitsubishi Heavy Ind Ltd
• Mitsubishi Heavy Ind Compressor Corp

Inventors

• Nakaniwa Akihiro
• Shinohara Hitoshi

Classifications

• F05D2260/37

  by a press fit connection · CPC title

• F01D5/14 Primary

  Form or construction (selecting particular materials, measures against erosion or corrosion F01D5/28) · CPC title

• F04D29/284

  for compressors · CPC title

• F04D29/624

  especially adapted for elastic fluid pumps · CPC title

• B23P15/006 Primary

  turbine wheels · CPC title