Scroll compressor provided with a stator winding baffle

Patent metadata

Field	Value
Publication number	US-11225967-B2
Application number	US-201916400541-A
Country	US
Kind code	B2
Filing date	May 1, 2019
Priority date	Jun 19, 2018
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

The scroll compressor (2) comprises a hermetic enclosure (3) comprising an outer shell (4); a compression unit (11) arranged within the hermetic enclosure (3); an electric motor (21) configured to drive the compression unit (11), the electric motor (21) including a rotor (22) and a stator (23); and an inner shell (26) in which the electric motor (21) is arranged. A baffle (34) is arranged inside the inner shell (26) at a stator end winding (25) of the electric motor (21), the baffle (34) comprising deflecting means configured to deflect at least a part of a main refrigerant flow, flowing inside the inner shell (26), towards said stator end winding (25).

First claim

What is claimed is:

1. A scroll compressor comprising:
a hermetic enclosure comprising an outer shell,
a compression unit arranged within the hermetic enclosure,
an electric motor configured to drive the compression unit with a drive shaft, the electric motor including a rotor and a stator, and
an inner shell arranged within the hermetic enclosure and in which the electric motor is arranged,
wherein a baffle is arranged inside the inner shell at a stator end winding of the electric motor, the baffle comprising deflecting means configured to deflect at least a part of a main refrigerant flow, flowing inside the inner shell, towards said stator end winding;
wherein the baffle defines a refrigerant outlet opening;
wherein the drive shaft is arranged in the refrigerant outlet opening wherein the baffle has a circular ring shape;
wherein the baffle includes a first axial section having an outer diameter substantially corresponding to an inner diameter of the inner shell, and a second axial section having an outer diameter smaller than the outer diameter of the first axial section and having an inner diameter larger than an outer diameter of said stator end winding; and
wherein the baffle further comprises a radially extending end wall which extends from the second axial section, the radially extending end wall defining the refrigerant outlet opening.

2. The scroll compressor according to claim 1 , wherein the first axial section includes at least one circumferential guiding portion having an inner guiding surface, the deflecting means and the inner guiding surface of the at least one circumferential guiding portion are configured to force a refrigerant flow entering the baffle in contact to said stator end winding.

3. The scroll compressor according to claim 2 , wherein a lower axial end surface of the at least one circumferential guiding portion rests on an upper surface of a stator core.

4. The scroll compressor according to claim 3 , wherein the first axial section includes at least one arcuate portion adjacent the at least one circumferential guiding portion, the at least one arcuate portion having a radius of curvature substantially corresponding to a radius of curvature of an inner surface of the inner shell.

5. The scroll compressor according to claim 2 , wherein the first axial section includes at least one arcuate portion adjacent the at least one circumferential guiding portion, the at least one arcuate portion having a radius of curvature substantially corresponding to a radius of curvature of an inner surface of the inner shell.

6. The scroll compressor according to claim 5 , wherein a lower axial end of the at least one circumferential guiding portion protruding in an axial direction from a lower axial end of the at least one arcuate portion.

7. The scroll compressor according to claim 2 , wherein the first axial section includes a plurality of circumferential guiding portions which are angularly offset and circumferentially distributed, and a plurality of arcuate portions which are angularly offset and circumferentially distributed, each of the arcuate portions extending between two adjacent circumferential guiding portions.

8. The scroll compressor according to claim 1 , wherein a circular gap (G) is defined between the rotor and the stator, and at least one outer flow channel (C) is formed between an outer surface of the stator and an inner surface of the inner shell, the scroll compressor being configured such that a first refrigerant flow part of the main refrigerant flow flows through the at least one outer flow channel (C) and a second refrigerant flow part of the main refrigerant flow flows through the circular gap (G).

9. The scroll compressor according to claim 8 , wherein the baffle and the stator define at least one refrigerant inlet opening through which the first refrigerant flow part can enter the baffle.

10. The scroll compressor according to claim 8 , wherein the first axial section is configured to collect the first refrigerant flow part of the main refrigerant flow and to deflect the first refrigerant flow part in both radial and circumferential directions along a surface of said stator end winding.

11. The scroll compressor according to claim 8 , wherein the baffle is angularly oriented in relation to the stator such that the at least one outer flow channel (C) is axially aligned with the at least one arcuate portion of the baffle.

12. The scroll compressor according to claim 1 , wherein the deflecting means includes a plurality of deflecting elements formed on an inner surface of the baffle.

13. The scroll compressor according to claim 12 , wherein each of the deflecting elements protrudes from a transition portion between the first and second axial sections.

14. The scroll compressor according to claim 12 , wherein each of the deflecting elements includes a curved blade shaped wall.

15. The scroll compressor according to claim 12 , wherein each of the deflecting elements is configured to deflect a part of the main refrigerant flow towards a respective circumferential guiding portion.

16. The scroll compressor according to claim 1 , wherein the baffle is arranged at an upper stator end winding of the electric motor, and wherein the deflecting means are configured to deflect at least a part of the main refrigerant flow, flowing inside the inner shell from a lower end of the electric motor towards an upper end of the electric motor, towards the upper stator end winding.

17. The scroll compressor according to claim 16 , wherein the baffle covers the upper stator end winding.

18. A scroll compressor comprising:
a hermetic enclosure comprising an outer shell,
a compression unit arranged within the hermetic enclosure,
an electric motor configured to drive the compression unit with a drive shaft, the electric motor including a rotor and a stator, and
an inner shell arranged within the hermetic enclosure and in which the electric motor is arranged,
wherein a baffle is arranged inside the inner shell at a stator end winding of the electric motor, the baffle comprising deflecting means configured to deflect at least a part of a main refrigerant flow, flowing inside the inner shell, towards said stator end winding;
wherein the baffle defines a refrigerant outlet opening;
wherein the drive shaft is arranged in the refrigerant outlet opening;
wherein the baffle has a circular ring shape;
wherein the baffle includes a first axial section having an outer diameter substantially corresponding to an inner diameter of the inner shell, and a second axial section having an outer diameter smaller than the outer diameter of the first axial section and having an inner diameter larger than an outer diameter of said stator end winding;
wherein the first axial section includes at least one circumferential guiding portion having an inner guiding surface, the deflecting means and the inner guiding surface of the at least one circumferential guiding portion are configured to force a refrigerant flow entering the baffle in contact to said stator end winding;
wherein the first axial section includes at least one arcuate portion adjacent the at least one circumferential guiding portion, the at least one arcuate portion having a radius of curvature substantially corresponding to a radius of curvature of an inner surface of the inner shell; and
wherein a lower axial end of the at least one circumferential guiding portion protruding in an axial direction from a lower axial end of the at least one arcuate portion.

Assignees

• Danfoss Commercial Compressors

Inventors

• Laville Alain
• Genevois David
• Lavy Julien

Classifications

• F04C2240/40

  Electric motor · CPC title

• F04C23/02

  Pumps characterised by combination with, or adaptation to, specific driving engines or motors · CPC title

• F04C29/045

  of the electric motor in hermetic pumps · CPC title

• F04C18/0215 Primary

  where only one member is moving · CPC title

• F04C23/008 Primary

  Hermetic pumps · CPC title