Linear compressor

Patent metadata

Field	Value
Publication number	US-9695811-B2
Application number	US-201414317120-A
Country	US
Kind code	B2
Filing date	Jun 27, 2014
Priority date	Jun 28, 2013
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

A linear compressor is provided. The linear compressor may include a shell having a refrigerant inlet, a cylinder arranged in the shell, a piston that reciprocates in the cylinder, a motor assembly that provides a drive force to the piston and having a permanent magnet, and a frame arranged on or at a side of the motor assembly. The cylinder may include a first outer circumference with which an inner stator of the motor assembly may be combined, and a second outer circumference that extends from the first outer circumference and forcibly press-fit into the frame.

First claim

What is claimed is:

1. A linear compressor, comprising:
a shell having an inlet;
a cylinder provided within the shell;
a piston that reciprocates in the cylinder;
a motor assembly that provides a drive force to the piston and having a permanent magnet; and
a frame arranged on a first side of the motor assembly; wherein the cylinder includes:
a first outer circumference with which an inner stator of the motor assembly is combined;
a second outer circumference that extends from the first outer circumference and which is forcibly press-fit into the frame;
a third outer circumference that extends from the second outer circumference;
a first step formed at an interface between the first outer circumference and the second outer circumference that supports an outer circumferential surface of the inner stator; and
a second step formed at an interface between the second outer circumference and the third outer circumference, wherein the second step includes a protrusion, wherein the frame includes:
a frame body haying an insertion portion into which the cylinder is inserted;
a press-fit portion into which the second outer circumference of the cylinder is forcibly press-fit;
a slope formed between the frame body and the press-fit portion; and
a hook that protrudes from an inner circumferential surface of the slope in a radial direction, wherein the hook is hooked on the protrusion, and wherein a space is formed between an inner circumferential surface of the hook and the second outer circumference.

2. The linear compressor according to claim 1 , wherein an inner diameter of the slope decreases as the slope, extends from the frame body to the press-fit portion.

3. The linear compressor according to claim 1 , wherein an external diameter of the second outer circumference is larger than an external diameter of the first outer circumference.

4. The linear compressor according to claim 1 , wherein an end of the press-fit portion of the frame is spaced from the inner stator.

5. The linear compressor according to claim 1 , wherein an external diameter of the third outer circumference is larger than a diameter of the second outer circumference.

6. The linear compressor according to claim 1 , wherein the second outer circumference includes a press-fit corresponding portion combined with the press-fit portion, and wherein a thickness of the press-fit corresponding portion is greater than a thickness of the press-fit portion.

7. The linear compressor according to claim 6 , wherein the thickness of the press-fit portion corresponding portion is five times to eight times the thickness of the press-fit portion.

8. The linear compressor according to claim 1 , wherein the motor assembly further includes an outer stator and a stator cover that supports the outer stator, and wherein the frame is coupled to the stator cover.

9. The linear compressor according to claim 1 , further including:
a discharge valve selectively opened to enable a refrigerant compressed in the cylinder to be discharged outside; and
a discharge muffler that surrounds the discharge valve, wherein the frame is coupled to the discharge muffler.

10. The linear compressor according to claim 1 , wherein the frame and the cylinder are made of aluminum or an aluminum alloy.

11. A linear compressor, comprising:
a shell having an inlet;
a cylinder provided within the shell;
a piston that reciprocates axially in the cylinder;
a motor assembly that provides a drive force to the piston and haying a permanent magnet; and
a frame arranged on a first side of the motor assembly and including a press-fit portion into which the cylinder is forcibly press-fit, wherein the cylinder includes:
a first outer circumference with which an inner stator of the motor assembly is combined; and
a second outer circumference that extends from the first outer circumference and which is forcibly press-fit into the press-fit portion of the frame, wherein an external diameter of the second outer circumference is larger than an external diameter of the first outer circumference; and
a first step formed at an interface between the first outer circumference and the second outer circumference, wherein the first step extends in a radial direction, wherein the inner stator is hooked to the first step, and wherein the inner stator is spaced apart from an end portion of the press-fit portion of the frame such that the inner stator does not contact with the press-fit portion.

12. The linear compressor according to claim 11 , wherein the frame further includes:
a frame body having an insertion portion into which the cylinder is inserted.

13. The linear compressor according to claim 12 , wherein a slope is formed between the frame body and the press-fit portion, and wherein an inner diameter of the slope decreases as the slope extends from the frame body to the press-fit portion.

14. The linear compressor according to claim 13 , wherein the frame further includes a hook at an inner circumferential surface of the slope, the hook being configured to be hooked on a protrusion of the cylinder.

15. The linear compressor according to claim 14 , wherein a space is formed between the hook and the second outer circumference.

16. The linear compressor according to claim 11 , wherein the cylinder further includes a third outer circumference that extends from the second outer circumference.

17. The linear compressor according to claim 16 , wherein a second step is formed at an interface between the second outer circumference and the third outer circumference.

18. The linear compressor according to claim 16 , wherein an external diameter of the third outer circumference is larger than the external diameter of the second outer circumference.

19. The linear compressor according to claim 12 , wherein the second outer circumference includes a press-fit corresponding portion combined with the press-fit portion, and wherein a thickness of the press-fit corresponding portion is five times to eight times greater than a thickness of the press-fit portion.

20. The linear compressor according to claim 11 , wherein the frame and the cylinder are made of aluminum or an aluminum alloy.

21. The linear compressor according to claim 1 , wherein the space is defined by the inner circumferential surface of the hook, the second outer circumference, and the protrusion.

Assignees

• Lg Electronics Inc

Inventors

• Kang Kyoungseok
• Jung Wonhyun
• Roh Chulgi
• Song Kiwook
• Kim Jookon
• Jeong Sangsub

Classifications

• F04B35/045 Primary

  using solenoids · CPC title

• F04B39/122

  Cylinder block · CPC title

• F04B39/127

  Mounting of a cylinder block in a casing · CPC title

• F04B39/0061

  using muffler volumes · CPC title

• F04B39/0284

  Constructional details, e.g. reservoirs in the casing (swash-plate compressors F04B27/0878, F04B27/109) · CPC title