Scroll compressor

Patent metadata

Field	Value
Publication number	US-10087937-B2
Application number	US-201514945567-A
Country	US
Kind code	B2
Filing date	Nov 19, 2015
Priority date	Nov 24, 2014
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

A scroll compressor is provided, in which a balancing space may be formed on a sub frame to accommodate at least one balance weight, and an oil discharge hole may be formed on a main frame, thereby suppressing, all from being introduced into or remaining in the balancing space to minimize agitation loss due to oil agitation in the balancing space, and forming a thrust surface of the main frame adjacent to an axial center of the drive shaft to suppress axial leakage at a central portion of the orbiting scroll, reducing a size of the main frame to reduce a total weight of the compressor, facilitating a centering operation of the sub frame, and suppressing an outer diameter of the sub frame from being increased, thereby accomplishing miniaturization of the scroll compressor.

First claim

What is claimed is:

1. A scroll compressor, comprising:
a casing divided into a suction space and a discharge space, wherein oil is stored in the suction space;
a main frame provided in the suction space of the casing;
a fixed scroll coupled to the main frame;
an orbiting scroll engaged with the fixed scroll to form a plurality of compression chambers including a suction chamber, an intermediate pressure chamber, and a discharge chamber while performing a relative movement;
a drive shaft coupled to the orbiting scroll to transmit a drive force to the orbiting scroll;
at least one balance weight coupled to the drive shaft to eliminate an eccentric load; and
a sub frame provided in the suction space of the casing, and coupled to the main frame to support the drive shaft along with the main frame, wherein a balancing space is formed on a surface of the sub frame facing the main frame to accommodate the at least one balance weight wherein an oil discharge hole is formed on the main frame to introduce the oil collected in the suction space into the plurality of compression chambers, an inlet of the oil discharge hole is formed outside of the balancing space, and a scatter hole that provides communication between the balancing space and the suction space is formed on the sub frame and wherein the oil discharge hole is formed to be lower than the scatter hole.

2. The scroll compressor of claim 1 , wherein an outlet of the oil discharge hole communicates with the suction chamber, which has a higher compression ratio among the plurality of compression chambers.

3. The scroll compressor of claim 1 , wherein a bearing receiving space is formed on the sub frame to accommodate a bearing that supports the drive shaft in a radial direction, and wherein one side of the bearing receiving space is formed to be open at a side of the balancing space.

4. The scroll compressor of claim 3 , wherein an inner diameter of the bearing receiving space is formed to be equal to or less than an inner diameter of the balancing space.

5. The scroll compressor of claim 1 , wherein at least one insertion protrusion is formed at an end portion of the sub frame to support an inner circumferential surface or an outer circumferential surface of the sub frame in a radial direction.

6. The scroll compressor of claim 1 , wherein the at least one balance weight includes a main balance weight and a sub balance weight, wherein the main balance weight is provided in the balancing space of the sub frame, and the sub balance weight is provided in an orbiting space formed on the main frame, and wherein an inner diameter of the orbiting space is less than an inner diameter of the balancing space.

7. The scroll compressor of claim 1 , wherein the main frame and the sub frame are coupled with at least one fastening bolt, and at least one head insertion groove, into which a head portion of the at least one fastening bolt is inserted, is formed on the main frame.

8. The scroll compressor of claim 7 , wherein the at least one head insertion groove is formed at an outside of a thrust surface of the main frame with respect to a central longitudinal axis of the scroll compressor.

9. The scroll compressor of claim 1 , wherein a surface, at which the main frame is brought into contact with the sub frame in an axial direction, is formed to be shorter than a length to an end of the shaft receiving portion of the main frame with respect to a thrust surface of the main frame, and wherein the sub frame is formed of a more rigid material than the main frame.

10. A scroll compressor, comprising:
a casing divided into a suction space and a discharge space, wherein oil is stored in the suction space;
a fixed scroll provided in the suction space of the casing;
an orbiting scroll engaged with the fixed scroll to form a plurality of compression chambers including a suction chamber, an intermediate pressure chamber, and a discharge chamber while performing a relative movement;
a drive shaft coupled to the orbiting scroll to transmit a drive force to the orbiting scroll;
a main balance weight and a sub balance weight coupled to the drive shaft with a predetermined distance therebetween to eliminate an eccentric load;
a main frame configured to support the drive shaft in a radial direction, and coupled to the fixed scroll to support the orbiting scroll in an axial direction, wherein an orbiting space that accommodates the sub balance weight is formed on a surface facing the orbiting scroll; and
a sub frame coupled to the main frame to support the drive shaft, wherein a balancing space that accommodates the main balance weight is formed on a surface of the sub frame facing the main frame, and wherein the balancing space is formed to have an inner diameter larger than an inner diameter of the orbiting space.

11. The scroll compressor of claim 10 , wherein an oil discharge hole is formed on the main frame to introduce oil collected in the balancing space into the plurality of compression chambers, and wherein an inlet of the oil discharge hole communicates with the balancing space.

12. The scroll compressor of claim 11 , wherein an oil discharge hole configured to introduce oil flowing into the suction space or oil flowing into the balancing space to the plurality of compression chambers is formed on the main frame, and wherein an outlet of the oil discharge hole communicates with the suction chamber at a side of the plurality of compression chambers having a relatively higher compression ratio among each suction chamber forming the plurality of compression chambers.

13. The scroll compressor of claim 10 , wherein an oil discharge hole is formed on the main frame to introduce oil collected in the suction space into the plurality of compression chambers, and wherein an inlet of the oil discharge hole is formed outside of the balancing space.

14. The scroll compressor of claim 13 , wherein a scatter hole that provides communicates between the balancing space and the suction space is formed on the sub frame, and the oil discharge hole is formed to be lower than the scatter hole.

15. The scroll compressor of claim 10 , wherein a bearing receiving space is formed on the sub frame to accommodate a bearing that supports the drive shaft in a radial direction, and wherein one side of the bearing receiving space is formed to be open at a side of the balancing space.

16. The scroll compressor of claim 10 , wherein a surface, at which the main frame is brought into contact with the sub frame in an axial direction, is formed to be shorter than a length to an end of the shaft receiving portion with respect to a thrust surface of the main frame, and wherein the sub frame is formed of a more rigid material than the main frame.

Assignees

• Lg Electronics Inc

Inventors

• Seong Sanghun
• Jang Kitae
• Won Inho
• Lee Jaesang
• Lee Byeongchul

Classifications

• F04C29/02

  Lubrication (of machines or engines in general F01M); Lubricant separation (separation in general B01D) · CPC title

• F04C29/005 Primary

  Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions · CPC title

• F04C29/0021

  Systems for the equilibration of forces acting on the pump (interstice adjustment other than by fluid pressure F01C21/102) · CPC title

• F04C18/0215

  where only one member is moving · CPC title

• F04C2240/807

  Balance weight, counterweight · CPC title