Centrifugal pump

Patent metadata

Field	Value
Publication number	US-2016281743-A1
Application number	US-201615181696-A
Country	US
Kind code	A1
Filing date	Jun 14, 2016
Priority date	Dec 27, 2013
Publication date	Sep 29, 2016
Grant date	—

Abstract

A centrifugal pump ( 10 ) includes a housing ( 26 ), an impeller ( 28 ) that is rotatably disposed in the housing ( 26 ), a shaft ( 62 ) that is provided at a center rotational axis of the impeller ( 28 ), and bearings members ( 70 ) that respectively and pivotally support the shaft ends ( 66 ). An elastic body ( 80 ) which is elastically deformable at least in an axial direction of the shaft ( 62 ) is provided between at least one of the bearings ( 70 ) and the housing ( 26 ) or at an intermediate portion of the shaft ( 62 ) in the axial direction. A tightening load exerted on the shaft and bearing members can be maintained in a predetermined range even when age-related deformation of the housing or other components occurs.

First claim

What is claimed is:

1 . A centrifugal pump comprising:
a housing with opposing walls defining a pumping chamber; an impeller rotatably disposed in the pumping chamber; a shaft fixed to the impeller at a center rotational axis of the impeller and having opposing shaft ends; bearing members on the housing walls pivotally supporting the opposing shaft ends, wherein the housing walls exert a tightening load on the shaft and bearing members; and an elastic body which is elastically deformable at least in the axial direction of the shaft and which is disposed to transmit the tightening load between the housing walls.

2 . The centrifugal pump according to claim 1 ,
wherein the elastic body is disposed between one of the bearing members and the housing.

3 . The centrifugal pump according to claim 2 ,
wherein the elastic body is disposed in a housing wall adjacent a rear surface side of the impeller.

4 . The centrifugal pump according to claim 2 ,
wherein the elastic body has a side wall surrounding an outer circumferential portion of the bearing member.

5 . The centrifugal pump according to claim 1 wherein the elastic body is made of silicone rubber.

6 . The centrifugal pump of claim 1 ,
wherein the elastic body is disposed at an intermediate portion of the shaft between separate shaft segments.

Assignees

• Terumo Corp

Inventors

• Itamochi Yosuke

Classifications

• A61M1/267

  used for pumping · CPC title

• F04D29/043

  Shafts · CPC title

• F04D1/00

  Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps (adapted for pumping specific fluids F04D7/00; priming or boosting F04D9/00) · CPC title

• F04D29/0467

  Spherical bearings · CPC title

• A61M1/1006

  Human Necessities · mapped topic