Linear compressor

Patent metadata

Field	Value
Publication number	US-9863410-B2
Application number	US-201514643422-A
Country	US
Kind code	B2
Filing date	Mar 10, 2015
Priority date	Jun 24, 2014
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

A linear compressor is provided. The linear compressor may include a shell including a suction inlet, a cylinder provided in the shell to define a compression space for a refrigerant, a piston reciprocated in an axial direction within the cylinder, a discharge valve provided on or at one side of the cylinder to selectively discharge the refrigerant compressed in the compression space, at least one nozzle disposed in the cylinder to introduce at least a portion of the refrigerant discharged through the discharge valve into the cylinder, and a passage to guide the refrigerant discharged from the discharge valve to the at least one nozzle.

First claim

What is claimed is:

1. A linear compressor, comprising:
a shell;
a cylinder provided in the shell to define a compression space for a refrigerant, the cylinder including a cylinder body and a cylinder flange that extends outward from the cylinder body in a radial direction and has a seat surface;
a piston reciprocated in an axial direction within the cylinder;
a discharge valve provided at one end of the cylinder to selectively discharge the refrigerant compressed in the compression space;
at least one nozzle provided in the cylinder body to introduce at least a portion of the refrigerant discharged through the discharge valve into the cylinder;
a discharge cover that defines a discharge space in which the discharge valve discharges the refrigerant;
a frame coupled to an outside of the cylinder, the frame including a frame body that surrounds the cylinder body, a cover coupling portion that extends in a radial direction of the frame body and is coupled to the discharge cover, a recess recessed from the cover coupling portion and into which the cylinder flange is inserted and a seat that extends inward from the recess in the radial direction and on which the seat surface is seated;
a first passage formed between the seat of the frame and the seat surface of the cylinder flange, the first passage being configured to guide the refrigerant discharged from the discharge valve into the at least one nozzle; and
a filter provided in the first passage and including a felt formed of polyethylene terephthalate (PET) fiber or an adsorption paper, the filter having a ring shape such that the cylinder flange pushes the filter when the filter is seated on the seat and the cylinder is coupled to the frame.

2. The linear compressor according to claim 1 , further comprising a second passage defined between an outer circumferential surface of the cylinder flange and an inner circumferential surface of the recess.

3. The linear compressor according to claim 2 , further comprising a third passage that extends from the first passage to a space between an outer circumferential surface of the cylinder body and an inner circumferential surface of the frame body.

4. The linear compressor according to claim 3 , further comprising at least one gas inflow recessed from the outer circumferential surface of the cylinder body to communicate with the at least one nozzle, wherein at least a portion of the refrigerant flowing into the third passage flows toward an inner circumferential surface of the cylinder body through the at least one gas inflow and the at least one nozzle.

5. The linear compressor according to claim 4 , further comprising a second filter installed in the at least one gas inflow, the second filter comprising a thread.

6. The linear compressor according to claim 5 , further comprising:
a sealing pocket that communicates with the third passage; and
a sealing member movably installed in the sealing pocket to seal a space between the inner circumferential surface of the frame and the outer circumferential surface of the cylinder.

7. The linear compressor according to claim 6 , wherein the sealing pocket has a flow cross-sectional area greater than a flow cross-sectional area of the third passage with respect to a flow direction of the refrigerant.

8. The linear compressor according to claim 6 , wherein the sealing pocket is defined by a first inclined portion of the cylinder body and a pocket formation part that is recessed from the inner circumferential surface of the frame body.

9. The linear compressor according to claim 6 , wherein a length of the sealing pocket in an axial direction is greater than a diameter of the sealing member such that the sealing member is movable within the sealing pocket.

10. The linear compressor according to claim 4 , wherein the at least one gas inflow includes a first gas inflow, a second gas inflow, and a third gas inflow, wherein the first gas inflow and the second gas inflow are provided close to an end of the cylinder body at which the refrigerant is discharged, and the third gas inflow is provided close to another end of the cylinder body at which the refrigerant is suctioned.

11. The linear compressor according to claim 4 , wherein the at least one gas inflow includes a first gas inflow, a second gas inflow, and a third gas inflow, which are provided asymmetrically with respect to a central portion in an axial direction of the cylinder body.

12. The linear compressor according to claim 4 , wherein the at least one nozzle includes an inlet connected to the at least one gas inflow and an outlet connected to the inner circumferential surface of the cylinder body, wherein a diameter of the inlet is greater than a diameter of the outlet.

13. The linear compressor according to claim 3 , wherein the third passage extends perpendicularly from the first passage.

14. The linear compressor according to claim 2 , wherein the first passage extends perpendicularly from the second passage.

Assignees

• Lg Electronics Inc

Inventors

• Kim Junghae
• Lee Kyoungkyu
• Ahn Kwangwoon

Classifications

• F04B39/123

  Fluid connections · CPC title

• F04B39/0292 Primary

  Lubrication of pistons or cylinders · CPC title

• F04B39/122

  Cylinder block · CPC title

• F04B39/126

  Cylinder liners · CPC title

• F04B35/045

  using solenoids · CPC title