Scroll compressor having oil supply groove in communication with oil supply hole defined from oil passage to rotating shaft surface

Patent metadata

Field	Value
Publication number	US-12117002-B2
Application number	US-202318149973-A
Country	US
Kind code	B2
Filing date	Jan 4, 2023
Priority date	May 30, 2022
Publication date	Oct 15, 2024
Grant date	Oct 15, 2024

Abstract

A scroll compressor is disclosed. The scroll compressor may include an oil supply hole penetrating from an oil passage to an outer circumferential surface of a rotating shaft, and an oil supply groove communicating with the oil supply hole and formed along the outer circumferential surface of the rotating shaft. The oil supply groove may be provided in plurality axially spaced apart by a preset distance. This can prevent the oil supply groove from invading an oil film section and increase centrifugal force against oil in the oil supply groove, thereby suppressing friction loss and wear between a main frame and the rotating shaft.

First claim

What is claimed is:

1. A scroll compressor comprising:
a main frame defining a bearing hole that extends therethrough in an axial direction;
a non-orbiting scroll disposed at the main frame;
an orbiting scroll configured to engage the non-orbiting scroll and define compression chambers together with the non-orbiting scroll based on the orbiting scroll orbiting; and
a rotating shaft including a main bearing surface portion that is inserted through the bearing hole of the main frame and supported in a radial direction, the rotating shaft being coupled to the orbiting scroll and configured to transmit rotational force,
wherein the rotating shaft comprises:
an oil passage defined through opposite ends of the rotating shaft in the axial direction,
an oil supply hole defined between the oil passage and an outer circumferential surface of the rotating shaft and extending toward the bearing hole of the main frame, and
a plurality of oil supply grooves being in fluid communication with the oil supply hole and defined along the outer circumferential surface of the rotating shaft at the main bearing surface portion, at least some of the plurality of oil supply grooves being spaced apart from each other on a same axis,

wherein the plurality of oil supply grooves comprise:
a first oil supply groove having a first end being connected to the oil supply hole and a second end being located higher than the first end of the first oil supply groove,
a second oil supply groove having a first end being spaced apart from the oil supply hole and a second end being located higher than the first end of the second oil supply groove, and
a communication groove that is defined between the first oil supply groove and the second oil supply groove along the outer circumferential surface of the rotating shaft and that has a first end and a second end spaced apart from each other along the outer circumferential surface of the rotating shaft,

wherein the first end of the communication groove is connected to the second end of the first oil supply groove, and
wherein the second end of the communication groove is connected to the first end of the second oil supply groove.

2. The scroll compressor of claim 1 , wherein the first oil supply groove has at least one of an inclination angle, a length, a height, or a cross-sectional area that is the same as at least one of an inclination angle, a length, a height, or a cross-sectional area of the second oil supply groove.

3. The scroll compressor of claim 1 , wherein the first oil supply groove has at least one of an inclination angle, a length, a height, or a cross-sectional area that is different from at least one of an inclination angle, a length, a height, or a cross-sectional area of the second oil supply groove.

4. The scroll compressor of claim 3 , wherein an inclination angle of the first oil supply groove is larger than an inclination angle of the second oil supply groove.

5. The scroll compressor of claim 3 , wherein a length of the first oil supply groove is shorter than a length of the second oil supply groove.

6. The scroll compressor of claim 3 , wherein a height of the first oil supply groove is lower than a height of the second oil supply groove.

7. The scroll compressor of claim 3 , wherein a cross-sectional area of the first oil supply groove is smaller than a cross-sectional area of the second oil supply groove.

8. The scroll compressor of claim 1 , wherein the communication groove is defined in a circumferential direction that is orthogonal to the axial direction.

9. The scroll compressor of claim 8 , wherein the communication groove is inclined with respect to the circumferential direction.

10. The scroll compressor of claim 9 , wherein the communication groove has a first groove end being connected to the first oil supply groove and a second groove end being connected to the second oil supply groove, the first groove end being lower than the second groove end.

11. The scroll compressor of claim 9 , wherein an inclination angle of the communication groove is smaller than or equal to an inclination angle of the first oil supply groove or the second oil supply groove.

12. The scroll compressor of claim 1 , wherein the first end of the first oil supply groove that is connected to the oil supply hole is located on a same axial line as the first end of the second oil supply groove that is connected to the communication groove.

13. The scroll compressor of claim 1 , wherein the first end of the first oil supply groove that is connected to the oil supply hole is located on a different axial line from the first end of the second oil supply groove that is connected to the communication groove.

14. The scroll compressor of claim 13 , wherein the first end of the second oil supply groove is located more forward than the oil supply hole based on a rotational direction of the rotating shaft.

15. The scroll compressor of claim 1 , wherein the oil supply hole is a single oil supply hole, and
wherein the plurality of oil supply grooves are connected to each other such that one end of the plurality of oil supply grooves is connected to the single oil supply hole.

16. The scroll compressor of claim 1 , wherein the oil supply hole includes a plurality of oil supply holes being spaced apart from each other in the axial direction, and
wherein the plurality of oil supply grooves are connected to the plurality of oil supply holes, respectively.

17. A scroll compressor comprising:
a main frame defining a bearing hole therethrough in an axial direction;
a non-orbiting scroll disposed at the main frame;
an orbiting scroll configured to engage the non-orbiting scroll and define compression chambers together with the non-orbiting scroll based on the orbiting scroll orbiting; and
a rotating shaft including a main bearing surface portion that is inserted through the bearing hole of the main frame and supported in a radial direction, the rotating shaft being coupled to the orbiting scroll and configured to transmit rotational force,
wherein the rotating shaft comprises:
an oil passage defined through opposite ends of the rotating shaft in the axial direction,
an oil supply hole defined between the oil passage and an outer circumferential surface of the rotating shaft and extending toward the bearing hole of the main frame,
a plurality of oil supply grooves being in fluid communication with the oil supply hole and defined along the outer circumferential surface of the rotating shaft at the main bearing surface portion, at least some of the plurality of oil supply grooves being spaced apart from each other on a same axis, and
a communication groove that is defined between the plurality of oil supply grooves along the outer circumferential surface of the rotating shaft and that has a first end and a second end spaced apart from each other along the outer circumferential surface of the rotating shaft,

wherein the plurality of oil supply grooves comprise (i) a first oil supply groove having a first end and a second end and (ii) a second oil supply groove having a first end and a second end,
wherein the first end of the communication groove is connected to the second end of the first oil supply groove, and
wherein the second end of the communication groove is connected to the first end of the second oil supply groove.

18. The scroll compressor of claim 17 , wherein the plurality of oil supply grooves have the same inclination angle, length, height, or cross-sectional area.

Assignees

• Lg Electronics Inc

Inventors

• Park Honghee
• Lee Jaesang
• Yu Byeonghun
• Jang Sooho

Classifications

• F04C29/023

  Lubricant distribution through a hollow driving shaft (F04C29/025 takes precedence) · CPC title

• F04C23/008

  Hermetic pumps · CPC title

• F04C2240/603

  with internal channels for fluid distribution, e.g. hollow shaft · CPC title

• F04C15/0088

  Lubrication (of machines or engines in general F01M) · CPC title

• F05B2210/14

  Refrigerants with particular properties, e.g. HFC-134a · CPC title