Housing for a fan of a scroll compressor

Patent metadata

Field	Value
Publication number	US-9874212-B2
Application number	US-201414780263-A
Country	US
Kind code	B2
Filing date	Mar 25, 2014
Priority date	Apr 5, 2013
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

Housing for channelling the airflow of a radial fan of an air-cooled scroll compressor, where this housing is formed by a volute with an outlet and an outlet bend connecting thereto with an included angle. The included angle is an acute angle that extends from one side of the median plane defined by the axis of the inlet and the center of the output of the outlet bend to the other side of the median plane located on the side of the end point of the transverse wall and up to a distance from this median plane.

First claim

The invention claimed is:

1. A housing for channelling an airflow of a radial fan of an air-cooled scroll compressor, comprising:
a volute for the housing of a rotor of the radial fan with an axial inlet for drawing in air in an axial direction parallel to a geometric axis through a center of the axial inlet and perpendicular to a plane of the axial inlet and a radial outlet, and
an outlet bend fitting to the radial outlet with an axial output,
whereby the volute is formed by two opposite walls, at least one of which is provided with a passage that forms the axial inlet, and which are connected together by a transverse wall whose radial distance to the geometric axis gradually increases in a rotation direction around the geometric axis from a starting point to an end point, and
whereby on an inside of the housing, the outlet bend connects to the transverse wall with an included angle at the location of the starting point, wherein the included angle is an acute angle viewed in a perpendicular projection on a plane perpendicular to the axis of the axial inlet, and the included angle extends from one side of the median plane defined by the axis of the axial inlet and a center of the axial output of the outlet bend to the other side of the median plane located on the side of the end point of the transverse wall and at a distance from this median plane.

2. The housing according to claim 1 , wherein a shortest distance from the starting point of the transverse wall to the median plane is greater than five percent of the diameter of the axial inlet.

3. The housing according to claim 2 , wherein the outlet bend at the location of the aforementioned end point of the transverse wall fits essentially tangentially to this transverse wall, viewed in a perpendicular projection on a plane perpendicular to the axis of the axial inlet.

4. The housing according to claim 2 , wherein the shortest distance from the starting point of the transverse wall to the median plane is greater than ten percent of the diameter of the axial inlet.

5. The housing according to claim 1 , wherein the outlet bend at the location of the end point of the transverse wall fits essentially tangentially to this transverse wall, viewed in a perpendicular projection on a plane perpendicular to the axis of the axial inlet.

6. The housing according to claim 1 , wherein the outlet bend forms a channel for bending the flow originating from the radial outlet in an axial direction opposite to the flow direction in the axial inlet.

7. The housing according to claim 1 , wherein in a cross-section according to the median plane, the outside wall of the outlet bend defines a circular segment with a radius that is greater than the width of the volute measured in the axial direction.

8. The housing according to claim 7 , wherein an end of the circular segment of the outside wall of the outlet bend fits tangentially to the second wall of the volute.

9. The housing according to claim 8 wherein the aforementioned circular segment extends from the radial output over an angle that is such that the second wall concerned and the other end of the circular segment are each located at an opposite side of the first wall of the volute and at a distance therefrom.

10. The housing according to claim 7 wherein the circular segment extends from the radial output over an angle that is such that the second wall concerned and the other end of the circular segment are each located at an opposite side of the first wall of the volute and at a distance therefrom.

11. The housing according to claim 10 , wherein the aforementioned circular segment extends from the radial output over an angle of 90°.

12. The housing according to claim 7 , wherein the outside wall is a cylindrical wall with a center line through the center of the circular segment and perpendicular to the median plane.

13. The housing according to claim 12 , wherein the inside wall on the inside of the outlet bend is a cylindrical wall that is concentric to the cylindrical outside wall.

14. The housing according to claim 7 , wherein in a cross-section according to the median plane, the inside wall of the outlet bend defines a circular segment.

15. The housing according to claim 14 , wherein the circular segment of the outlet bend on the inside wall is concentric to the circular segment of the outside wall of the outlet bend.

16. The housing according to claim 15 , wherein the circular segment of the inside wall of the outlet bend fits tangentially to the first wall.

17. The housing according to claim 14 , wherein the circular segment of the inside wall of the outlet bend fits tangentially to the first wall.

18. The housing according to claim 1 , wherein the housing is constructed from two parts with a dividing line between the two parts which, at the location of the transverse wall of the volute is located in a dividing plane perpendicular to the geometric axis, and at the location of the outlet bend in two dividing planes that are oblique with respect to the first dividing plane.

19. An air-cooled scroll compressor with a radial fan with a rotor that is affixed in a housing, wherein the housing is a housing according to claim 1 .

20. The air-cooled scroll compressor according to claim 19 , wherein the axial output of the outlet bend is provided with a deflector for channelling the ventilation flow over or along the cooling fins of the scroll compressor.

21. A housing for channelling an airflow of a radial fan of an air-cooled scroll compressor, comprising:
a volute for the housing of a rotor of the radial fan with an axial inlet for drawing in air in an axial direction parallel to a geometric axis through a center of the axial inlet and perpendicular to a plane of the axial inlet and a radial outlet, and
an outlet bend fitting to the radial outlet with an axial output,
whereby the volute is formed by two opposite walls, at least one of which is provided with a passage that forms the axial inlet, and which are connected together by a transverse wall whose radial distance to the geometric axis gradually increases in a rotation direction around geometric axis from a starting point to an end point, and
whereby on an inside of the housing, the outlet bend connects to the transverse wall with an included angle at the location of the starting point, wherein the included angle is an acute angle viewed in a perpendicular projection on a plane perpendicular to the axis of the axial inlet, and the included angle extends from one side of the median planer defined by the axis of the axial inlet and the center of the axial output of the outlet bend to the other side of the median plane located on the side of the end point of the transverse wall and at a distance from this median plane,
wherein a shortest distance from the starting point of the transverse wall to the median plane is greater than five percent of the diameter of the axial inlet, and
wherein the outlet bend forms a channel for bending the airflow originating from the radial outlet in an axial direction opposite to the flow direction in the axial inlet.

Assignees

• Atlas Copco Airpower Nv

Inventors

• Theelen Jochen Emiel C
• Van Leuven Gert August
• Van Mieghem Luc
• Mathys Wim Jan L
• Potters Tom Andre J
• STOOP Koen

Classifications

• F04C18/0223 Primary

  with symmetrical double wraps · CPC title

• F04D29/424

  Double entry casings · CPC title

• F04C29/04 Primary

  Heating; Cooling (of machines or engines in general F01P); Heat insulation (heat insulation in general F16L59/00) · CPC title

• F04D29/4253

  with axial entry and discharge · CPC title

• F04D29/582

  specially adapted for elastic fluid pumps · CPC title