Centrifugal pump

Patent metadata

Field	Value
Publication number	US-10519977-B2
Application number	US-201615134236-A
Country	US
Kind code	B2
Filing date	Apr 20, 2016
Priority date	May 20, 2015
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

A centrifugal pump is provided, which includes a rotor assembly and a shaft. The rotor assembly includes an injection molded body and a shaft sleeve, the rotor assembly is injection molded taking the shaft sleeve as an injection molding insert, and the impeller injection molded body and the shaft sleeve are fixed by injection molding. The rotor assembly is rotatably supported on the shaft by the shaft sleeve, and the shaft sleeve is processed by injection molding or forging. The shaft sleeve is of a hollow structure, and the shaft sleeve includes a body. A central hole is formed in the body. The shaft sleeve further includes an impeller limiting portion configured to limit a rotating movement and an axial movement of the shaft sleeve with respect to the injection molded body.

First claim

The invention claimed is:

1. A centrifugal pump, comprising a rotor assembly and a shaft, wherein the rotor assembly comprises an injection molded body and a shaft sleeve, the injection molded body comprises an impeller, the rotor assembly is formed by injection molding taking the shaft sleeve as an injection molding insert, the injection molded body is fixed to the shaft sleeve by injection molding, and the rotor assembly is rotatably supported on the shaft via the shaft sleeve, wherein:
the shaft sleeve is formed by injection molding, or formed by forging, or formed by forging and machining, or formed by extruding and machining, or formed by powder sintering, or formed by machining;
the shaft sleeve comprises a body, a central hole is formed in the body of the shaft sleeve, the body of the shaft sleeve comprises an outer surface and an inner surface, the inner surface encloses to form the central hole, the shaft is arranged to pass through the central hole, and the outer surface is fixed by injection molding to the injection molded body; and
the shaft sleeve further comprises an impeller limiting portion, the impeller limiting portion is arranged on an outer surface of the shaft sleeve, the impeller limiting portion comprises protrusions distributed at intervals and protruding beyond the outer surface of the shaft sleeve in a radial direction, and the impeller limiting portion is configured to limit a rotating movement and an axial movement of the shaft sleeve with respect to the injection molded body via the protrusions; and
inner grooves are formed in an inner surface of the shaft sleeve and are formed by sinking from the inner surface of the shaft sleeve into a body of the shaft sleeve, the inner grooves are arranged at portions where the protrusions are arranged; and
wherein the protrusions are protruding ribs formed by protruding from the outer surface of the shaft sleeve, and the protruding ribs extend in an axial direction of the shaft sleeve, a width of each of the protruding ribs is less than a distance between adjacent protruding ribs, the protruding ribs are arranged to form at least one segment in the axial direction of the shaft sleeve, and top portions of the protruding ribs are located in the same cylindrical surface or the same truncated conical surface taking a central axis of the shaft sleeve as a central line;
the centrifugal pump comprises at least one inner passage, and the inner passage comprises clearances formed between the shaft and the inner grooves of the shaft sleeve; and
the number of protruding ribs is the same as the number of the inner grooves, the protruding ribs are arranged corresponding to the inner grooves, and thicknesses of positions where the inner grooves and the protruding ribs are arranged, of the body of the shaft sleeve are equal to thicknesses of positions where the inner grooves and the protruding ribs are not provided, of the body of the shaft sleeve.

2. The centrifugal pump according to claim 1 , wherein protrusions extend in an axial direction of the shaft sleeve, and lengths of the protrusions are less than or equal to a length of the shaft sleeve, or a height of one part of each of the protrusions protruding beyond the outer surface of the shaft sleeve is greater than a height of another part of the protrusion.

3. The centrifugal pump according to claim 2 , wherein the outer surface of the shaft sleeve comprises a first cylindrical surface and a second cylindrical surface, an outer diameter of the first cylindrical surface is the same as an outer diameter of the second cylindrical surface, each of the protrusions is arranged between the first cylindrical surface and the second cylindrical surface, and in a cross section passing through a central axis of the shaft sleeve and the protrusion, each of the protrusions comprises at least a circular-arc shaped part.

4. The centrifugal pump according to claim 3 , wherein at least two said impeller limiting portions are provided in a circumferential direction of the outer surface of the shaft sleeve, and the impeller limiting portions are distributed at equal intervals or uniformly distributed in the circumferential direction of the outer surface of the shaft sleeve.

5. The centrifugal pump according to claim 4 , wherein the centrifugal pump comprises at least one inner passage, and the inner passage comprises clearances formed between the shaft and the inner grooves of the shaft sleeve.

6. The centrifugal pump according to claim 2 , wherein the outer diameters of the protrusions are the same, the outer surface of the shaft sleeve comprises three parts, the protrusions are located at a middle part of the shaft sleeve, each of the protrusions has a maximum outer surface, the maximum outer surface forming a virtual circle, the virtual circle has a diameter greater than outer diameters of the other two parts of the outer surface, and along the axial direction of the shaft sleeve, the other two parts of the outer surface have outer diameters gradually increased from two ends of the shaft sleeve to a connection portion between the protrusions and the other two parts.

7. The centrifugal pump according to claim 6 , wherein at least two said impeller limiting portions are provided in a circumferential direction of the outer surface of the shaft sleeve, and the impeller limiting portions are distributed at equal intervals or uniformly distributed in the circumferential direction of the outer surface of the shaft sleeve.

8. The centrifugal pump according to claim 7 , wherein the centrifugal pump comprises at least one inner passage, and the inner passage comprises clearances formed between the shaft and the inner grooves of the shaft sleeve.

9. The centrifugal pump according to claim 2 , wherein at least two said impeller limiting portions are provided in a circumferential direction of the outer surface of the shaft sleeve, and the impeller limiting portions are distributed at equal intervals or uniformly distributed in the circumferential direction of the outer surface of the shaft sleeve.

10. The centrifugal pump according to claim 9 , wherein the centrifugal pump comprises at least one inner passage, and the inner passage comprises clearances formed between the shaft and the inner grooves of the shaft sleeve.

11. The centrifugal pump according to claim 2 , wherein the centrifugal pump comprises at least one inner passage, and the inner passage comprises clearances formed between the shaft and the inner grooves of the shaft sleeve.

12. The centrifugal pump according to claim 1 , wherein a length of each of the protruding ribs is the same as a length of the shaft sleeve, each of the protruding ribs comprises portions towards two ends of the shaft sleeve and a portion at a middle portion of the shaft sleeve, and a height of each of the portions towards two ends of the shaft sleeve protruding beyond the outer surface of the shaft sleeve is less than a height of the portion at the middle portion of the shaft sleeve protruding beyond the outer surface of the shaft sleeve.

13. The centrifugal pump according to claim 12 , wherein at least two said impeller limiting portions are provided in a circumferential direction of the outer surface of the shaft sleeve, and the impeller limiting portions are distributed at equal intervals or uniformly distributed in the circumferential direction of the outer surface of the shaft sleeve.

14. The centrifugal pump according to claim 13 , wherein the centrifugal pump comprises at least one inner passage, and the inner passage comprises clearances formed between the shaft and the inner grooves of the shaft sleeve.

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Assignees

• Hangzhou Sanhua Res Inst Co Ltd
• Zhejiang Sanhua Automotive Components Co Ltd

Inventors

• Zhang Junchao
• Ye Wei
• Bao Junfeng
• Zhang Rongrong

Classifications

• F04D29/628 Primary

  especially adapted for liquid pumps · CPC title

• F04D29/22

  specially for centrifugal pumps · CPC title

• F04D29/043

  Shafts · CPC title

• F04D29/053

  Shafts · CPC title

• F04D29/02

  Selection of particular materials (for handling specific liquids F04D7/00 {F04D23/001}) · CPC title