Double-suction centrifugal pump

Patent metadata

Field	Value
Publication number	US-11441576-B2
Application number	US-201917252932-A
Country	US
Kind code	B2
Filing date	May 29, 2019
Priority date	Jun 22, 2018
Publication date	Sep 13, 2022
Grant date	Sep 13, 2022

Abstract

The present invention relates to a reinforcing structure for a casing accommodating an impeller. A double-suction centrifugal pump includes: a rotational shaft (1); an impeller (2) secured to the rotational shaft (1); a casing (3) that accommodates the impeller (2) therein; and legs (5) secured to the casing (3). The casing (3) includes a suction volute (20) that communicates with a suction port (6), the casing (3) includes an upper casing (3a) and a lower casing (3b) fastened to each other, at least one rib (28A, 28B, 28C) is provided on each of both side surfaces of the lower casing (3b) constituting the suction volute (20), the rib (28A, 28B, 28C) extends in a radial direction of the rotational shaft (1) when viewed from an axial direction of the rotational shaft (1), and the rib (28A, 28B, 28C) is separated from the legs (5).

First claim

What is claimed is:

1. A double-suction centrifugal pump comprising:
a rotational shaft;
an impeller secured to the rotational shaft;
a casing that accommodates the impeller therein; and
legs secured to the casing,
wherein the casing includes a suction volute that communicates with a suction port,
the casing includes an upper casing and a lower casing fastened to each other,
at least one rib is provided on each of both side surfaces of the lower casing constituting the suction volute,
the at least one rib extends in a radial direction of the rotational shaft when viewed from an axial direction of the rotational shaft, and
the at least one rib is separated from the legs,
wherein the at least one rib provided on each of both side surfaces of the suction volute comprises a plurality of ribs, and
wherein the plurality of ribs are located in a fan-shaped area whose central line coincides with a vertical line passing through a central axis of the rotational shaft when viewed from the axial direction of the rotational shaft, and a central angle of the fan-shaped area is 140 degrees or less.

2. The double-suction centrifugal pump according to claim 1 , wherein the at least one rib has a height that gradually decreases with a distance from an upper end of the at least one rib.

3. The double-suction centrifugal pump according to claim 1 , wherein the lower casing has a semicircular annular portion extending along a circumferential surface of the rotational shaft, and an upper end of the at least one rib is connected to the semicircular annular portion.

4. The double-suction centrifugal pump according to claim 1 , wherein the at least one rib has a lower end smoothly connected to an outer surface of the lower casing.

5. The double-suction centrifugal pump according claim 1 , wherein at least one of the plurality of ribs has a cross section different from a cross section of another one of the plurality of ribs.

6. The double-suction centrifugal pump according to claim 1 , wherein the legs are located on extension lines of the plurality of ribs.

7. The double-suction centrifugal pump according to claim 1 , further comprising at least one upper rib provided on an outer surface of the upper casing.

8. The double-suction centrifugal pump according to claim 1 , further comprising at least one bottom rib provided on a bottom of the lower casing.

9. A double-suction centrifugal pump comprising:
a rotational shaft;
an impeller secured to the rotational shaft;
a casing that accommodates the impeller therein; and
legs secured to the casing,
wherein the casing includes a suction volute that communicates with a suction port,
the casing includes an upper casing and a lower casing fastened to each other,
at least one rib is provided on each of both side surfaces of the lower casing constituting the suction volute,
the at least one rib extends in a radial direction of the rotational shaft when viewed from an axial direction of the rotational shaft, and
the at least one rib is separated from the legs,
wherein the at least one rib provided on each of both side surfaces of the suction volute comprises a plurality of ribs, and
wherein the plurality of ribs have different lengths, and a respective rib closer to the suction port is longer.

Assignees

• Ebara Corp

Inventors

• Ogawa Soichiro
• Kawasaki Hiroyuki
• Miyamoto Takayuki

Classifications

• F05D2240/126

  Baffles or ribs · CPC title

• F04D29/4233

  with volutes extending mainly in axial or radially inward direction · CPC title

• F04D29/281

  for fans or blowers · CPC title

• F04D1/006 Primary

  double suction pumps · CPC title

• F05D2260/941

  particularly aimed at mechanical or thermal stress reduction · CPC title