Centrifugal separator for cleaning gas

Patent metadata

Field	Value
Publication number	US-10493468-B2
Application number	US-201615542785-A
Country	US
Kind code	B2
Filing date	Jan 27, 2016
Priority date	Feb 2, 2015
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

A centrifugal separator for cleaning a gas containing liquid impurities includes a stationary casing including a surrounding sidewall, a first end wall and a second end wall which enclose a space through which a gas flow is permitted. The space includes an upper separation chamber and a lower discharge chamber. The separator further includes an inlet extending through the stationary casing and permitting supply of the gas to be cleaned to the separation chamber, a rotating member including a stack of separation discs and being arranged to rotate around an axis of rotation, wherein the stack of separation discs is arranged in the separation chamber and a drive member for rotating the rotating member. The discharge chamber is arranged axially below the stack of separation discs such that clean gas and separated liquid impurities both enter said discharge chamber after being separated in said stack of separation discs, and further, the separator includes a gas outlet configured to permit discharge of cleaned gas from said stationary casing, wherein the gas outlet includes an outlet opening through the stationary casing and a portion extending from the outlet opening into the discharge chamber. Further, there is a drainage outlet arranged in said discharge chamber and configured to permit discharge of separated liquid impurities from said stationary casing.

First claim

The invention claimed is:

1. A centrifugal separator for cleaning a gas containing liquid impurities, comprising:
a stationary casing comprising a surrounding side wall, a first end wall and a second end wall, the surrounding side wall and the first and second end walls enclosing a space through which a gas flow is permitted, said space comprising an upper separation chamber and a lower discharge chamber;
an inlet extending through the stationary casing and permitting supply of the gas to be cleaned to the separation chamber;
a rotating member comprising a stack of separation discs and being arranged to rotate around an axis of rotation, wherein the stack of separation discs is arranged in the separation chamber;
a drive member for rotating the rotating member, wherein said lower discharge chamber is arranged axially below the stack of separation discs such that clean gas and separated liquid impurities both enter said lower discharge chamber after being separated in said stack of separation discs;
a gas outlet configured to permit discharge of cleaned gas from said stationary casing, wherein the gas outlet comprises an outlet opening through the stationary casing and a portion extending from the outlet opening into the lower discharge chamber, the portion having an inlet opening spaced from the outlet opening; and
a drainage outlet arranged in said lower discharge chamber and configured to permit discharge of separated liquid impurities from said stationary casing,
wherein the rotating member further comprises a lower flange arranged axially below said portion of the gas outlet extending from the outlet opening into the lower discharge chamber.

2. The centrifugal separator according to claim 1 , wherein said lower flange is arranged axially between the drainage outlet and said portion of the gas outlet extending from the outlet opening into the lower discharge chamber.

3. The centrifugal separator according to claim 1 , wherein the rotating member further comprises an upper flange arranged axially between the portion of the gas outlet extending into the lower discharge chamber and the disc stack.

4. The centrifugal separator according to claim 3 , wherein the inlet opening is under the upper flange and within an outer circumference of the upper flange.

5. The centrifugal separator according to claim 1 , wherein the rotating member further comprises a frustoconical portion onto which said disc stack is arranged.

6. The centrifugal separator according to claim 1 , wherein said portion of the gas outlet extending from the outlet opening into the lower discharge chamber is hollow and comprises a peripheral wall and an opening in the peripheral wall through which the cleaned gas is retrieved and directed to said outlet opening through the stationary casing.

7. The centrifugal separator according to claim 6 , wherein said portion of the gas outlet extends into the stationary casing such that said opening in the peripheral wall is located on a radius from rotational axis that is less than half of the total radius of the stationary casing.

8. The centrifugal separator according to claim 6 , wherein said opening in the peripheral wall faces the rotational axis.

9. The centrifugal separator according to claim 6 , wherein said opening in the peripheral wall faces away from said rotational axis.

10. The centrifugal separator according to claim 9 , wherein said opening in the peripheral wall is directed in a direction that is approximately 45 degrees relative the rotational axis.

11. The centrifugal separator according to claim 6 , wherein said portion of the gas outlet extending from the outlet opening into the lower discharge chamber comprises a tubular part and a narrowing part, wherein said tubular part is arranged at said outlet opening through the stationary casing and said narrowing part comprises said opening in the peripheral wall and wherein said narrowing part is arranged further away from said outlet opening through the stationary casing compared to said tubular part.

12. The centrifugal separator according to claim 11 , wherein said narrowing part comprises and end wall extending in a plane formed by the rotational axis and the radius from the rotational axis.

13. A method for cleaning a gas containing liquid impurities comprising the steps of:
providing the centrifugal separator according to claim 1 ;
introducing gas containing liquid impurities into the inlet of said centrifugal separator; and
discharging clean gas through said gas outlet and discharging liquid impurities separated from the gas through said drainage outlet.

14. The method according to claim 13 , wherein said gas containing liquid impurities is crankcase gas of a combustion engine and said liquid impurities comprises oil.

15. The centrifugal separator according to claim 1 , wherein the rotating member further comprises an upper flange arranged axially between the portion of the gas outlet extending into the lower discharge chamber and the disc stack.

16. The centrifugal separator according to claim 1 , wherein the portion has a tubular sidewall and an end wall, and
wherein the inlet opening is formed in the tubular sidewall.

17. The centrifugal separator according to claim 1 , further comprising a drainage hole in the portion between the inlet opening and the outlet opening.

18. The centrifugal separator according to claim 1 , further comprising an outlet conduit extending outwardly from the outlet opening.

Assignees

• Alfa Laval Corp Ab

Inventors

• Pogén Mats-Örjan

Classifications

• B04B11/06

  Arrangement of distributors or collectors in centrifuges · CPC title

• F01M13/04

  having means for purifying air before leaving crankcase, e.g. removing oil · CPC title

• B04B7/02

  Casings; Lids (shock absorbers, vibration dampers F16F) · CPC title

• B04B11/02

  Continuous feeding or discharging; Control arrangements therefor · CPC title

• B04B5/12 Primary

  Centrifuges in which rotors other than bowls generate centrifugal effects in stationary containers · CPC title