KR20220088005A - Linear compressor - Google Patents

Abstract

A linear compressor is provided. A linear compressor according to an aspect of the present specification includes a shell having a suction pipe for sucking a refrigerant, a cylinder disposed in the shell, a piston disposed in the cylinder and reciprocating in the axial direction, and the a suction muffler disposed at the rear of the piston; an inner guide communicating with the suction muffler and disposed inside the piston; an auxiliary guide disposed inside the suction muffler and coupled to the rear of the inner guide; and a metal mesh disposed in the expansion space formed between the auxiliary guides.

Description

Linear compressor {LINEAR COMPRESSOR}

This specification relates to a linear compressor. More particularly, it relates to a linear compressor that compresses a refrigerant by a linear reciprocating motion of a piston.

In general, a compressor refers to a device configured to compress a working fluid such as air or a refrigerant by receiving power from a power generating device such as a motor or a turbine. Specifically, the compressor is widely applied to the entire industry, home appliances, in particular, a vapor compression refrigeration cycle (hereinafter referred to as a 'refrigeration cycle').

Such a compressor may be classified into a reciprocating compressor, a rotary compressor (rotary compressor), and a scroll compressor according to a method of compressing the refrigerant.

The reciprocating compressor is a method in which a compression space is formed between the piston and the cylinder and the piston moves linearly to compress the fluid. It is a method of compressing the fluid by rotating a pair of scrolls in engagement.

Recently, among reciprocating compressors, the use of a linear compressor using a linear reciprocating motion without using a crankshaft is gradually increasing. The linear compressor has advantages in that the efficiency of the compressor is improved because the mechanical loss involved in converting the rotational motion into a linear reciprocating motion is small, and the structure is relatively simple.

The linear compressor is configured such that a cylinder is positioned inside a casing forming a closed space to form a compression chamber, and a piston covering the compression chamber reciprocates within the cylinder. In a linear compressor, when the piston is positioned at the bottom dead center (BDC), the fluid in the enclosed space is sucked into the compression chamber, and when the piston is positioned at the top dead center (TDC), the fluid in the compression chamber is The process of being compressed and discharged is repeated.

A compression unit and a drive unit are respectively installed inside the linear compressor, and through movement generated in the drive unit, the compression unit performs a process of compressing and discharging refrigerant while resonating by a resonance spring.

The piston of the linear compressor sucks the refrigerant into the casing through the suction pipe while reciprocating at high speed inside the cylinder by the resonance spring, and then discharges from the compression space through the forward movement of the piston and moves to the condenser through the discharge pipe. A series of processes are repeatedly performed.

As the piston reciprocates inside the cylinder in the axial direction, noise is generated in the process of continuously sucking, compressing, and discharging refrigerant.

In order to reduce the noise generated in this way, a muffler is installed inside the piston body.

In this case, as the refrigerant flows into the expansion space in the muffler, the refrigerant is dispersed and the pressure of the refrigerant is lowered.

Korean Patent Publication No. 10-1484324 B (2015.01.20. Announcement)

An object of the present specification is to provide a linear compressor capable of preventing a pressure drop of a refrigerant when a refrigerant flows into an expansion space within a muffler.

In addition, an object of the present specification is to provide a linear compressor capable of reducing noise by dissipating wave energy in an expansion space within a muffler.

A linear compressor according to an aspect of the present specification for achieving the above object includes a shell having a suction pipe for sucking a refrigerant, a cylinder disposed in the shell, and a cylinder disposed in the cylinder and reciprocating in the axial direction A moving piston, a suction muffler disposed behind the piston, an inner guide communicating with the suction muffler and disposed inside the piston, and an auxiliary guide disposed inside the suction muffler and coupled to the rear of the inner guide; , It may include a metal mesh disposed in the expansion space formed between the inner guide and the auxiliary guide.

Through this, when the refrigerant flows into the expansion space in the muffler, it is possible to prevent the pressure drop of the refrigerant.

In addition, it is possible to reduce the noise by dissipating the wave energy in the expansion space in the muffler.

In addition, the density of the edge region of the metal mesh may be higher than that of the central region.

In addition, the metal mesh may include a first mesh member formed in a cylindrical shape, and a second mesh member extending inward from the inner surface of the first mesh member.

In addition, the inner guide includes an inner body extending in an axial direction, an inner flange extending in a radial direction in a rear region of the inner body, and an inner coupling portion extending rearwardly from the inner flange, wherein the auxiliary guide includes: It may include an auxiliary body overlapping the inner body in an axial direction, an auxiliary flange extending in a radial direction from the auxiliary body, and an auxiliary coupling part extending forwardly from the auxiliary flange and coupled to the inner coupling part.

In addition, the inner coupling portion and the auxiliary coupling portion may overlap in an axial direction.

In addition, the expansion space may be formed in a space between the inner flange and the inner coupling part and the auxiliary flange and the auxiliary coupling part, and the expansion space may not overlap the auxiliary body in an axial direction.

In addition, the metal mesh may include a first mesh member formed in a cylindrical shape and disposed in the expansion space, and a second mesh member extending inward from the inner surface of the first mesh member and disposed between the inner body and the auxiliary body. may include

In addition, the second mesh member may not overlap the inner space of the auxiliary body in the axial direction.

In addition, the inner body and the auxiliary body may be spaced apart in an axial direction.

A linear compressor according to an aspect of the present specification for achieving the above object includes a shell having a suction pipe for sucking a refrigerant, a cylinder disposed in the shell, and a cylinder disposed in the cylinder and reciprocating in the axial direction A moving piston, a suction muffler disposed behind the piston, an inner guide communicating with the suction muffler and disposed inside the piston, and an auxiliary guide disposed inside the suction muffler and coupled to the rear of the inner guide; , a metal filter coupled to the auxiliary guide, and an expansion space may be formed between the inner guide and the auxiliary guide and the metal filter.

Through this, when the refrigerant flows into the expansion space in the muffler, it is possible to prevent the pressure drop of the refrigerant.

In addition, it is possible to reduce the noise by dissipating the wave energy in the expansion space in the muffler.

In addition, the inner guide includes an inner body extending in an axial direction, an inner flange extending in a radial direction in a rear region of the inner body, and an inner coupling portion extending rearwardly from the inner flange, wherein the auxiliary guide includes: An auxiliary body coupled to the rear surface of the inner body, an auxiliary flange extending in a radial direction from the auxiliary body, an auxiliary coupling portion extending forwardly from the auxiliary flange and coupled to the inner coupling portion, and formed in the auxiliary body, and a metal filter hole communicating with the expansion space, wherein the metal filter may be disposed in the metal filter hole.

In addition, the auxiliary guide may include a step portion formed on the front surface of the auxiliary body and coupled to the inner body.

Through the present specification, it is possible to provide a linear compressor capable of preventing the pressure drop of the refrigerant when the refrigerant flows into the expansion space in the muffler.

In addition, through the present specification, it is possible to provide a linear compressor capable of reducing noise by dissipating wave energy in the expansion space within the muffler.

1 is a perspective view of a linear compressor according to an embodiment of the present specification.
2 is a cross-sectional view of a linear compressor according to an embodiment of the present specification.
3 is a cross-sectional view of a muffler unit and a metal mesh of a linear compressor according to an embodiment of the present specification.
4 and 5 are schematic views of a mesh member according to an embodiment of the present specification.
6 is a view showing the overall shape of the mesh member according to an embodiment of the present specification.
FIG. 7 is a cutaway view of a part of FIG. 6 .
8 is an exploded perspective view illustrating a part of a muffler unit of a linear compressor according to another exemplary embodiment of the present specification.
9 is a cross-sectional view of a muffler unit and a metal filter of a linear compressor according to another embodiment of the present specification.
10 is a table comparing the efficiency of the conventional and linear compressors according to embodiments of the present specification.

Hereinafter, embodiments disclosed in the present specification (discloser) will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numbers regardless of reference numerals, and redundant description thereof will be omitted.

In the description of the embodiments disclosed herein, when a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but It should be understood that other components may exist in between.

In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed in this specification is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present specification , should be understood to include equivalents or substitutes.

On the other hand, the terms of the specification (discloser) can be replaced with terms such as document, specification, description.

1 is a perspective view of a linear compressor according to an embodiment of the present specification.

Referring to FIG. 1 , the linear compressor 100 according to an embodiment of the present specification may include a shell 111 and shell covers 112 and 113 coupled to the shell 111 . In a broad sense, the shell covers 112 and 113 may be understood as one configuration of the shell 111 .

The lower side of the shell 111, the leg 20 may be coupled. The leg 20 may be coupled to the base of the product on which the linear compressor 100 is installed. For example, the product may include a refrigerator, and the base may include a machine room base of the refrigerator. As another example, the product may include the outdoor unit of the air conditioner, and the base may include the base of the outdoor unit.

The shell 111 has a substantially cylindrical shape, and may form an arrangement lying in a transverse direction or an arrangement lying in an axial direction. Referring to FIG. 1 , the shell 111 extends long in the horizontal direction, and may have a rather low height in the radial direction. That is, since the linear compressor 100 may have a low height, for example, when the linear compressor 100 is installed in the machine room base of the refrigerator, there is an advantage that the height of the machine room can be reduced.

In addition, the longitudinal central axis of the shell 111 coincides with the central axis of the main body of the compressor 100 to be described later, and the central axis of the main body of the compressor 100 is the cylinder 140 and the piston constituting the main body of the compressor 100 . It may coincide with the central axis of (150).

The terminal 30 may be installed on the outer surface of the shell 111 . The terminal 30 may transmit external power to the driving unit 130 of the linear compressor 100 . Specifically, the terminal 30 may be connected to a lead wire of the coil 132b.

A bracket 31 may be installed outside the terminal 30 . The bracket 31 may include a plurality of brackets surrounding the terminal 30 . The bracket 31 may function to protect the terminal 30 from an external impact.

Both sides of the shell 111 may be open. Shell covers 112 and 113 may be coupled to both sides of the opened shell 111 . Specifically, the shell covers 112 and 113 include a first shell cover 112 coupled to one open side of the shell 111 and a second shell cover 113 coupled to the other open side of the shell 111 . ) may be included. The inner space of the shell 111 may be sealed by the shell covers 112 and 113 .

Referring to FIG. 1 , the first shell cover 112 may be located on the right side of the linear compressor 100 , and the second shell cover 113 may be located on the left side of the linear compressor 100 . In other words, the first and second shell covers 112 and 113 may be disposed to face each other. In addition, it may be understood that the first shell cover 112 is located on the suction side of the refrigerant, and the second shell cover 113 is located on the discharge side of the refrigerant.

The linear compressor 100 is provided in the shell 111 or the shell covers 112 and 113, and may include a plurality of pipes 114, 115, and 40 capable of sucking, discharging, or injecting refrigerant.

A plurality of pipes (114, 115, 40) is a suction pipe (114) so that the refrigerant is sucked into the interior of the linear compressor (100), and a discharge pipe (115) so that the compressed refrigerant is discharged from the linear compressor (100), It may include a replenishment pipe 40 for replenishing the refrigerant to the linear compressor 100 .

For example, the suction pipe 114 may be coupled to the first shell cover 112 . The refrigerant may be sucked into the linear compressor 100 along the axial direction through the suction pipe 114 .

The discharge pipe 115 may be coupled to the outer peripheral surface of the shell 111 . The refrigerant sucked through the suction pipe 114 may be compressed while flowing in the axial direction. And the compressed refrigerant may be discharged through the discharge pipe (115). The discharge pipe 115 may be disposed at a position closer to the second shell cover 113 than the first shell cover 112 .

The supplementary pipe 40 may be coupled to the outer circumferential surface of the shell 111 . The operator may inject the refrigerant into the linear compressor 100 through the supplementary pipe 40 .

The supplementary pipe 40 may be coupled to the shell 111 at a different height from the discharge pipe 115 in order to avoid interference with the discharge pipe 115 . Here, the height may be understood as the distance in the vertical direction from the leg 20 . Since the discharge pipe 115 and the supplement pipe 40 are coupled to the outer peripheral surface of the shell 111 at different heights, work convenience can be promoted.

At least a portion of the second shell cover 113 may be located adjacent to the inner circumferential surface of the shell 111 corresponding to the point at which the supplementary pipe 40 is coupled. In other words, at least a portion of the second shell cover 113 may act as a resistance of the refrigerant injected through the supplementary pipe 40 .

Therefore, from the viewpoint of the flow path of the refrigerant, the size of the flow path of the refrigerant introduced through the supplementary pipe 40 is reduced by the second shell cover 113 while entering the inner space of the shell 111, and becomes larger again as it passes therethrough. can be formed to In this process, the pressure of the refrigerant is reduced and the refrigerant may be vaporized, and in this process, the oil contained in the refrigerant may be separated. Accordingly, as the refrigerant from which the oil is separated flows into the piston 150, the compression performance of the refrigerant may be improved. Oil can be understood as the hydraulic fluid present in the cooling system.

2 is a cross-sectional view for explaining the structure of the linear compressor 100 .

Hereinafter, the linear compressor according to the present specification will be described by taking as an example a linear compressor in which a piston performs an operation of sucking in and compressing a fluid while linearly reciprocating, and discharging the compressed fluid.

The linear compressor may be a component of a refrigeration cycle, and the fluid compressed in the linear compressor may be a refrigerant circulating in the refrigeration cycle. The refrigeration cycle may include a condenser, an expansion device and an evaporator in addition to the compressor. In addition, the linear compressor may be used as one component of the cooling system of the refrigerator, and is not limited thereto and may be widely used throughout the industry.

Referring to FIG. 2 , the compressor 100 may include a casing 110 and a body accommodated in the casing 110 . The main body of the compressor 100 includes a frame 120 , a cylinder 140 fixed to the frame 120 , a piston 150 linearly reciprocating inside the cylinder 140 , and a piston fixed to the frame 120 . A driving unit 130 that applies a driving force to 150 may be included. Here, the cylinder 140 and the piston 150 may be referred to as compression units 140 and 150 .

The compressor 100 may include bearing means for reducing friction between the cylinder 140 and the piston 150 . The bearing means may be oil bearings or gas bearings. Alternatively, a mechanical bearing may be used as the bearing means.

The main body of the compressor 100 may be elastically supported by support springs 116 and 117 installed at both inner ends of the casing 110 . The support springs 116 and 117 may include a first support spring 116 for supporting the rear of the body and a second support spring 117 for supporting the front of the body. The support springs 116 and 117 may include leaf springs. The support springs 116 and 117 may absorb vibrations and shocks generated according to the reciprocating motion of the piston 150 while supporting the internal components of the main body of the compressor 100 .

The casing 110 may form an enclosed space. The sealed space includes an accommodation space 101 in which the sucked refrigerant is accommodated, a suction space 102 filled with the refrigerant before being compressed, a compression space 103 for compressing the refrigerant, and a discharge space filled with the compressed refrigerant ( 104) may be included.

The refrigerant sucked from the suction pipe 114 connected to the rear side of the casing 110 is filled in the receiving space 101 , and the refrigerant in the suction space 102 communicating with the receiving space 101 is compressed in the compression space 103 . is discharged to the discharge space 104 , and may be discharged to the outside through the discharge pipe 115 connected to the front side of the casing 110 .

The casing 110 includes a shell 111 having both ends open and formed in a substantially transversely long cylindrical shape, a first shell cover 112 coupled to the rear side of the shell 111, and a second coupled to the front side. It may include a shell cover 113 . Here, the front side may be interpreted to mean a direction in which the compressed refrigerant is discharged to the left of the drawing, and the rear side may be interpreted to mean a direction in which the refrigerant is introduced to the right side of the drawing. In addition, the first shell cover 112 or the second shell cover 113 may be integrally formed with the shell 111 .

The casing 110 may be formed of a thermally conductive material. Through this, the heat generated in the inner space of the casing 110 can be quickly radiated to the outside.

The first shell cover 112 may be coupled to the shell 111 to seal the rear side of the shell 111 , and the suction pipe 114 may be inserted and coupled to the center of the first shell cover 112 .

The rear side of the main body of the compressor 100 may be elastically supported in the radial direction of the first shell cover 112 by the first support spring 116 .

The first support spring 116 may include a circular leaf spring. The edge of the first support spring 116 may be elastically supported in the forward direction with respect to the back cover 123 by the support bracket 123a. The opened central portion of the first support spring 116 may be supported in a rearward direction with respect to the first shell cover 112 by the suction guide 116a.

The suction guide 116a may have a through passage formed therein. The suction guide 116a may be formed in a cylindrical shape. The suction guide 116a may have a central opening coupled to a front side outer circumferential surface of the first support spring 116 , and a rear side end may be supported by the first shell cover 112 . At this time, a separate suction-side support member 116b may be interposed between the suction guide 116a and the inner surface of the first shell cover 112 .

The rear side of the suction guide 116a communicates with the suction pipe 114 , and the refrigerant sucked through the suction pipe 114 passes through the suction guide 116a and can be smoothly introduced into the muffler unit 160 to be described later.

A damping member 116c may be disposed between the suction guide 116a and the suction-side support member 116b. The damping member 116c may be formed of a rubber material or the like. Accordingly, it is possible to block the vibration that may be generated while the refrigerant is sucked through the suction pipe 114 from being transmitted to the first shell cover 112 .

The second shell cover 113 may be coupled to the shell 111 to seal the front side of the shell 111 , and the discharge pipe 115 may be inserted through the roof pipe 115a to be coupled thereto. The refrigerant discharged from the compression space 103 may be discharged to the refrigerating cycle through the loop pipe 115a and the discharge pipe 115 after passing through the discharge cover assembly 180 .

The front side of the main body of the compressor 100 may be elastically supported in the radial direction of the shell 111 or the second shell cover 113 by the second support spring 117 .

The second support spring 117 may include a circular leaf spring. The opened central portion of the second support spring 117 may be supported in a rearward direction with respect to the discharge cover assembly 180 by the first support guide 117b. The edge of the second support spring 117 may be supported in the forward direction with respect to the inner surface of the shell 111 or the inner peripheral surface of the shell 111 adjacent to the second shell cover 113 by the support bracket 117a. .

Unlike FIG. 2 , the edge of the second support spring 117 is adjacent to the inner surface of the shell 111 or the second shell cover 113 through a separate bracket (not shown) coupled to the second shell cover 113 . It may be supported in the forward direction with respect to the inner circumferential surface of the shell 111 .

The first support guide 117b may be formed in a cylindrical shape. A cross-section of the first support guide 117b may include a plurality of diameters. The front side of the first support guide 117b may be inserted into the central opening of the second support spring 117 , and the rear side may be connected to the discharge cover assembly 180 . The support cover 117c may be coupled to the front side of the first support guide 117b with the second support spring 117 interposed therebetween. A cup-shaped second support guide 117d concave in the front may be coupled to the front side of the support cover 117c. A cup-shaped third support guide 117e corresponding to the second support guide 117d and recessed rearward may be coupled to the inside of the second shell cover 113 . The second support guide 117d may be inserted into the inside of the third support guide 117e to be supported in the axial direction and/or the radial direction. In this case, a gap may be formed between the second support guide 117d and the third support guide 117e.

The frame 120 may include a body portion 121 supporting the outer circumferential surface of the cylinder 140 and a first flange portion 122 connected to one side of the body portion 121 and supporting the driving unit 130 . can The frame 120 may be elastically supported with respect to the casing 110 by the first and second support springs 116 and 117 together with the driving unit 130 and the cylinder 140 .

The body part 121 may surround the outer peripheral surface of the cylinder 140 . The body portion 121 may be formed in a cylindrical shape. The first flange part 122 may be formed to extend radially from the front end of the body part 121 .

A cylinder 140 may be coupled to the inner circumferential surface of the body portion 121 . An inner stator 134 may be coupled to an outer circumferential surface of the body portion 121 . For example, the cylinder 140 may be fixed by press fitting on the inner circumferential surface of the body portion 121 , and the inner stator 134 may be fixed using a separate fixing ring (not shown).

The outer stator 131 may be coupled to the rear surface of the first flange part 122 , and the discharge cover assembly 180 may be coupled to the front surface thereof. For example, the outer stator 131 and the discharge cover assembly 180 may be fixed through a mechanical coupling means.

A bearing inlet groove 125a constituting a part of the gas bearing is formed on one side of the front surface of the first flange portion 122 , and a bearing communication hole 125b penetrates from the bearing inlet groove 125a to the inner circumferential surface of the body portion 121 . ) is formed, and a gas groove 125c communicating with the bearing communication hole 125b may be formed on the inner circumferential surface of the body portion 121 .

The bearing inlet groove (125a) is formed by being depressed in the axial direction to a predetermined depth, and the bearing communication hole (125b) is a hole having a smaller cross-sectional area than the bearing inlet groove (125a) toward the inner peripheral surface or the inner surface of the body part 121. It may be formed to be inclined. In addition, the gas groove 125c may be formed in an annular shape having a predetermined depth and an axial length on the inner circumferential surface of the body portion 121 . Alternatively, the gas groove 125c may be formed on the outer circumferential surface of the cylinder 140 in contact with the inner circumferential surface of the body portion 121 or may be formed on both the inner circumferential surface of the body portion 121 and the outer circumferential surface of the cylinder 140 .

In addition, a gas inlet 142 corresponding to the gas groove 125c may be formed on the outer peripheral surface of the cylinder 140 . The gas inlet 142 forms a kind of nozzle part in the gas bearing.

Meanwhile, the frame 120 and the cylinder 140 may be formed of aluminum or an aluminum alloy material.

The cylinder 140 may be formed in a cylindrical shape in which both ends are open. The piston 150 may be inserted through the rear end of the cylinder 140 . The front end of the cylinder 140 may be closed via the discharge valve assembly 170 . A compression space 103 may be formed between the cylinder 140 , the front end of the piston 150 , and the discharge valve assembly 170 . Here, the front end of the piston 150 may be referred to as a head portion (151). The volume of the compression space 103 increases when the piston 150 moves backward, and decreases as the piston 150 moves forward. That is, the refrigerant introduced into the compression space 103 may be compressed while the piston 150 advances and discharged through the discharge valve assembly 170 .

The cylinder 140 may include a second flange portion 141 disposed at the front end. The second flange portion 141 may be bent to the outside of the cylinder 140 . The second flange portion 141 may extend in an outer circumferential direction of the cylinder 140 . The second flange portion 141 of the cylinder 140 may be coupled to the frame 120 . For example, a flange groove corresponding to the second flange portion 141 of the cylinder 140 may be formed at the front end of the frame 120 , and the second flange portion 141 of the cylinder 140 may be It may be inserted into the flange groove and coupled through a coupling member.

On the other hand, a gas bearing means capable of lubricating the gas between the cylinder 140 and the piston 150 by supplying the discharge gas at an interval between the outer circumferential surface of the piston 150 and the outer circumferential surface of the cylinder 140 may be provided. The discharge gas supplied between the cylinder 140 and the piston 150 may provide levitation force to the piston 150 to reduce friction between the piston 150 and the cylinder 140 .

For example, the cylinder 140 may include a gas inlet 142 . The gas inlet 142 may communicate with the gas groove 125c formed on the inner circumferential surface of the body 121 . The gas inlet 142 may radially penetrate the cylinder 140 . The gas inlet 142 may guide the compressed refrigerant flowing into the gas groove 125c between the inner peripheral surface of the cylinder 140 and the outer peripheral surface of the piston 150 . Alternatively, in consideration of the convenience of processing, the gas groove 125c may be formed on the outer peripheral surface of the cylinder 140 .

The inlet of the gas inlet 142 may be relatively wide, and the outlet may be formed as a fine through hole to serve as a nozzle. A filter (not shown) for blocking the inflow of foreign substances may be additionally provided at the inlet of the gas inlet 142 . The filter may be a metal mesh filter, or may be formed by winding a member such as Cecil.

A plurality of gas inlets 142 may be independently formed, or an inlet may be formed in an annular groove and a plurality of outlets may be formed at regular intervals along the annular groove. The gas inlet 142 may be formed only on the front side with respect to the middle of the cylinder 140 in the axial direction. Alternatively, the gas inlet 142 may also be formed on the rear side with respect to the middle of the cylinder 140 in the axial direction in consideration of the deflection of the piston 150 .

The piston 150 is inserted into the open end at the rear of the cylinder 140 , and is provided to seal the rear of the compression space 103 .

The piston 150 may include a head part 151 and a guide part 152 . The head part 151 may be formed in a disk shape. The head part 151 may be partially open. The head part 151 may partition the compression space 103 . The guide part 152 may extend rearward from the outer circumferential surface of the head part 151 . The guide part 152 may be formed in a cylindrical shape. The guide part 152 may have a hollow interior and may be partially sealed by the head part 151 at the front. The rear of the guide part 152 may be opened to be connected to the muffler unit 160 . The head unit 151 may be provided as a separate member coupled to the guide unit 152 . Alternatively, the head part 151 and the guide part 152 may be integrally formed.

The piston 150 may include a suction port 154 . The suction port 154 may pass through the head part 151 . The suction port 154 may communicate with the suction space 102 and the compression space 103 inside the piston 150 . For example, the refrigerant flowing into the suction space 102 inside the piston 150 from the receiving space 101 passes through the suction port 154 and the compression space 103 between the piston 150 and the cylinder 140 . ) can be inhaled.

The suction port 154 may extend in an axial direction of the piston 150 . The suction port 154 may be inclined in the axial direction of the piston 150 . For example, the suction port 154 may extend toward the rear of the piston 150 to be inclined in a direction away from the central axis.

The suction port 154 may have a circular cross-section. The suction port 154 may have a constant inner diameter. Alternatively, the suction port 154 may be formed as a long hole in which the opening extends in the radial direction of the head portion 151, or may be formed such that the inner diameter increases toward the rear.

A plurality of suction ports 154 may be formed in any one or more directions of a radial direction and a circumferential direction of the head part 151 .

A suction valve 155 for selectively opening and closing the suction port 154 may be mounted on the head 151 of the piston 150 adjacent to the compression space 103 . The suction valve 155 may open or close the suction port 154 by operating by elastic deformation. That is, the suction valve 155 may be elastically deformed to open the suction port 154 by the pressure of the refrigerant flowing into the compression space 103 through the suction port 154 . The suction valve 155 may be a lead valve, but is not limited thereto and may be variously changed.

The piston 150 may be connected to the mover 135 . The mover 135 may reciprocate in the front-rear direction according to the movement of the piston 150 . An inner stator 134 and a cylinder 140 may be disposed between the mover 135 and the piston 150 . The mover 135 and the piston 150 may be connected to each other by a magnet frame 136 formed by bypassing the cylinder 140 and the inner stator 134 to the rear.

The muffler unit 160 may be coupled to the rear of the piston 150 to reduce noise generated while the refrigerant is sucked into the piston 150 . The refrigerant sucked through the suction pipe 114 may flow into the suction space 102 inside the piston 150 through the muffler unit 160 .

The muffler unit 160 includes a suction muffler 161 communicating with the receiving space 101 of the casing 110 , and an inner guide 162 connected to the front of the suction muffler 161 and guiding the refrigerant to the suction port 154 . ) may be included.

The suction muffler 161 may be positioned at the rear of the piston 150 , the rear opening may be disposed adjacent to the suction pipe 114 , and the front end may be coupled to the rear of the piston 150 . The suction muffler 161 may have a flow path formed in the axial direction to guide the refrigerant in the accommodation space 101 to the suction space 102 inside the piston 150 .

A plurality of noise spaces partitioned by a baffle may be formed inside the suction muffler 161 . The suction muffler 161 may be formed by coupling two or more members to each other, and for example, a plurality of noise spaces may be formed while the second suction muffler is press-fitted inside the first suction muffler. In addition, the suction muffler 161 may be formed of a plastic material in consideration of weight or insulation.

One side of the inner guide 162 may communicate with the noise space of the suction muffler 161 , and the other side may be deeply inserted into the piston 150 . The inner guide 162 may be formed in a pipe shape. Both ends of the inner guide 162 may have the same inner diameter. The inner guide 162 may be formed in a cylindrical shape. Alternatively, the inner diameter of the front end on the discharge side may be formed to be larger than the inner diameter of the rear end on the opposite side.

The suction muffler 161 and the inner guide 162 may be provided in various shapes, and the pressure of the refrigerant passing through the muffler unit 160 may be adjusted through them. The suction muffler 161 and the inner guide 162 may be integrally formed.

The discharge valve assembly 170 may include a discharge valve 171 and a valve spring 172 provided on the front side of the discharge valve 171 to elastically support the discharge valve 171 . The discharge valve assembly 170 may selectively discharge the refrigerant compressed in the compression space 103 . Here, the compression space 103 means a space formed between the intake valve 155 and the discharge valve 171 .

The discharge valve 171 may be disposed to support the front surface of the cylinder 140 . The discharge valve 171 may selectively open and close the front opening of the cylinder 140 . The discharge valve 171 may open or close the compression space 103 by operating by elastic deformation. The discharge valve 171 may be elastically deformed to open the compression space 103 by the pressure of the refrigerant flowing into the discharge space 104 through the compression space 103 . For example, in a state in which the discharge valve 171 is supported on the front surface of the cylinder 140 , the compression space 103 maintains a sealed state, and the discharge valve 171 is spaced apart from the front surface of the cylinder 140 . The compressed refrigerant of the compressed space 103 may be discharged to the open space in the . The discharge valve 171 may be a reed valve, but is not limited thereto.

The valve spring 172 may be provided between the discharge valve 171 and the discharge cover assembly 180 to provide an elastic force in the axial direction. The valve spring 172 may be provided as a compression coil spring, or may be provided as a leaf spring in consideration of occupied space or reliability.

When the pressure in the compression space 103 is equal to or greater than the discharge pressure, the valve spring 172 deforms forward to open the discharge valve 171 , and the refrigerant is discharged from the compression space 103 to the discharge cover assembly 180 . It may be discharged to the first discharge space 104a. When the discharge of the refrigerant is completed, the valve spring 172 may provide a restoring force to the discharge valve 171 to close the discharge valve 171 .

A process in which the refrigerant flows into the compression space 103 through the suction valve 155 and the refrigerant in the compression space 103 is discharged to the discharge space 104 through the discharge valve 171 will be described as follows.

In the process of the piston 150 reciprocating and linear motion inside the cylinder 140 , when the pressure in the compression space 103 becomes less than a predetermined suction pressure, the suction valve 155 is opened and the refrigerant flows into the compression space 103 . is inhaled On the other hand, when the pressure in the compression space 103 exceeds the predetermined suction pressure, the refrigerant in the compression space 103 is compressed in a state in which the suction valve 155 is closed.

On the other hand, when the pressure in the compression space 103 is equal to or greater than a predetermined discharge pressure, the valve spring 172 deforms forward and opens the discharge valve 171 connected thereto, and the refrigerant is discharged from the compression space 103 into the discharge cover assembly ( It is discharged to the discharge space 104 of 180). When the discharge of the refrigerant is completed, the valve spring 172 provides a restoring force to the discharge valve 171 , and the discharge valve 171 is closed to seal the front of the compression space 103 .

The discharge cover assembly 180 is installed in front of the compression space 103 to form a discharge space 104 for accommodating the refrigerant discharged from the compression space 103 , and is coupled to the front of the frame 120 so that the refrigerant is Noise generated in the process of being discharged from the compressed space 103 may be attenuated. The discharge cover assembly 180 may be coupled to the front of the first flange part 122 of the frame 120 while accommodating the discharge valve assembly 170 . For example, the discharge cover assembly 180 may be coupled to the first flange part 122 through a mechanical coupling member.

And between the discharge cover assembly 180 and the frame 120, a gasket 165 for insulation and an O-ring 166 (O-ring) for suppressing leakage of the refrigerant in the discharge space 104 may be provided. .

The discharge cover assembly 180 may be formed of a thermally conductive material. Accordingly, when a high-temperature refrigerant flows into the discharge cover assembly 180 , the heat of the refrigerant is transferred to the casing 110 through the discharge cover assembly 180 to be radiated to the outside of the compressor.

The discharge cover assembly 180 may include a single discharge cover, or a plurality of discharge covers may be arranged to communicate sequentially. When the discharge cover assembly 180 is provided with a plurality of discharge covers, the discharge space 104 may include a plurality of space portions partitioned by each discharge cover. The plurality of space portions may be disposed in the front-rear direction and may communicate with each other.

For example, when there are three discharge covers, the discharge space 104 is a first discharge space 104a formed between the frame 120 and the first discharge cover 181 coupled to the front side of the frame 120 . and a second discharge space 104b formed between the first discharge cover 181 and a second discharge cover 182 that communicates with the first discharge space 104a and is coupled to the front side of the first discharge cover 181 . ) and a third discharge space ( 104c).

In addition, the first discharge space 104a selectively communicates with the compression space 103 by the discharge valve 171 , the second discharge space 104b communicates with the first discharge space 104a , and the third discharge The space 104c may communicate with the second discharge space 104b. Accordingly, the refrigerant discharged from the compression space 103 passes through the first discharge space 104a, the second discharge space 104b, and the third discharge space 104c in sequence, the discharge noise is attenuated, and the third discharge It may be discharged to the outside of the casing 110 through the roof pipe 115a and the discharge pipe 115 communicating with the cover 183 .

The driving unit 130 includes an outer stator 131 disposed between the shell 111 and the frame 120 to surround the body portion 121 of the frame 120 , and between the outer stator 131 and the cylinder 140 . It may include an inner stator 134 disposed to surround the cylinder 140 , and a mover 135 disposed between the outer stator 131 and the inner stator 134 .

The outer stator 131 may be coupled to the rear of the first flange portion 122 of the frame 120 , and the inner stator 134 may be coupled to an outer peripheral surface of the body portion 121 of the frame 120 . In addition, the inner stator 134 may be disposed to be spaced apart from the inside of the outer stator 131 , and the mover 135 may be disposed in a space between the outer stator 131 and the inner stator 134 .

A winding coil may be mounted on the outer stator 131 , and the mover 135 may include a permanent magnet. The permanent magnet may be configured as a single magnet having one pole, or by combining a plurality of magnets having three poles.

The outer stator 131 may include a coil winding body 132 surrounding the axial direction in a circumferential direction and a stator core 133 stacked while surrounding the coil winding body 132 . The coil winding body 132 may include a hollow cylindrical bobbin 132a and a coil 132b wound in a circumferential direction of the bobbin 132a. The cross-section of the coil 132b may be formed in a circular or polygonal shape, for example, may have a hexagonal shape. In the stator core 133 , a plurality of lamination sheets may be radially stacked, and a plurality of lamination blocks may be stacked along a circumferential direction.

The front side of the outer stator 131 may be supported by the first flange part 122 of the frame 120 , and the rear side may be supported by the stator cover 137 . For example, the stator cover 137 may be provided in the shape of a hollow disk, the outer stator 131 may be supported on the front surface, and the resonance spring 118 may be supported on the rear surface.

The inner stator 134 may be configured by stacking a plurality of laminations on the outer circumferential surface of the body portion 121 of the frame 120 in the circumferential direction.

One side of the mover 135 may be coupled to and supported by the magnet frame 136 . The magnet frame 136 has a substantially cylindrical shape and may be disposed to be inserted into a space between the outer stator 131 and the inner stator 134 . And the magnet frame 136 is coupled to the rear side of the piston 150 may be provided to move together with the piston (150).

For example, the rear end of the magnet frame 136 is bent and extended in the radial direction to form a first coupling portion 136a, the first coupling portion 136a is a third formed at the rear of the piston (150). It may be coupled to the flange portion 153 . The first coupling portion 136a of the magnet frame 136 and the third flange portion 153 of the piston 150 may be coupled through a mechanical coupling member.

Furthermore, a fourth flange portion 161a formed in front of the suction muffler 161 is interposed between the third flange portion 153 of the piston 150 and the first coupling portion 136a of the magnet frame 136 . can Accordingly, the piston 150, the muffler unit 160, and the mover 135 may be linearly reciprocated together in an integrally coupled state.

When a current is applied to the driving unit 130 , magnetic flux is formed in the winding coil, and the magnetic flux formed in the winding coil of the outer stator 131 and the magnetic flux formed by the permanent magnet of the mover 135 are mutually Electromagnetic force is generated by the action, so that the mover 135 can move. Also, the piston 150 connected to the magnet frame 136 may reciprocate in the axial direction integrally with the mover 135 at the same time as the mover 135 reciprocates in the axial direction.

Meanwhile, the driving unit 130 and the compression units 140 and 150 may be supported in the axial direction by the support springs 116 and 117 and the resonance spring 118 .

The resonance spring 118 amplifies the vibration implemented by the reciprocating motion of the mover 135 and the piston 150, thereby achieving effective compression of the refrigerant. Specifically, the resonance spring 118 may be adjusted to a frequency corresponding to the natural frequency of the piston 150 to allow the piston 150 to perform a resonance motion. In addition, the resonance spring 118 may induce a stable movement of the piston 150 to reduce vibration and noise generation.

The resonant spring 118 may be an axially extending coil spring. Both ends of the resonance spring 118 may be connected to the vibrating body and the fixed body, respectively. For example, one end of the resonance spring 118 may be connected to the magnet frame 136 , and the other end may be connected to the back cover 123 . Accordingly, the resonance spring 118 may be elastically deformed between the vibrating body vibrating at one end and the fixed body fixed at the other end.

The natural frequency of the resonant spring 118 is designed to match the resonant frequency of the mover 135 and the piston 150 when the compressor 100 is operating, thereby amplifying the reciprocating motion of the piston 150 . However, since the back cover 123 provided as a fixed body is elastically supported by the casing 110 through the first support spring 116 , it may not be strictly fixed.

The resonance spring 118 may include a first resonance spring 118a supported on the rear side with respect to the spring supporter 119 and a second resonance spring 118b supported on the front side.

The spring supporter 119 includes a body portion 119a surrounding the suction muffler 161, a second coupling portion 119b bent in the inner radial direction from the front of the body portion 119a, and the body portion 119a. It may include a support portion 119c that is bent from the rear to the outer radial direction.

The front surface of the second coupling part 119b of the spring supporter 119 may be supported by the first coupling part 136a of the magnet frame 136 . The inner diameter of the second coupling portion 119b of the spring supporter 119 may surround the outer diameter of the suction muffler 161 . For example, the second coupling portion 119b of the spring supporter 119, the first coupling portion 136a of the magnet frame 136, and the third flange portion 153 of the piston 150 are sequentially disposed It may then be integrally coupled through a mechanical member. At this time, the fourth flange portion 161a of the suction muffler 161 is interposed between the third flange portion 153 of the piston 150 and the first coupling portion 136a of the magnet frame 136 to be fixed together. It can be as described above.

The first resonance spring 118a may be disposed between the front surface of the back cover 123 and the rear surface of the spring supporter 119 . The second resonance spring 118b may be disposed between the rear surface of the stator cover 137 and the front surface of the spring supporter 119 .

A plurality of first and second resonance springs 118a and 118b may be disposed in a circumferential direction of the central axis. The first resonant spring 118a and the second resonant spring 118b may be disposed side by side in the axial direction or may be disposed to cross each other. The first and second resonance springs 118a and 118b may be disposed at regular intervals in the radial direction of the central axis. For example, the first and second resonant springs 118a and 118b may be provided by three, respectively, and may be disposed at intervals of 120 degrees in the radial direction of the central axis.

The compressor 100 may include a plurality of sealing members capable of increasing the coupling force between the frame 120 and components around it.

For example, the plurality of sealing members are interposed in a portion where the frame 120 and the discharge cover assembly 180 are coupled, and a first sealing member inserted into an installation groove provided at the front end of the frame 120 and the frame ( It may include a second sealing member provided at a portion where the 120 and the cylinder 140 are coupled and inserted into the installation groove provided on the outer surface of the cylinder 140 . The second sealing member prevents the refrigerant in the gas groove 125c formed between the inner circumferential surface of the frame 120 and the outer circumferential surface of the cylinder 140 from leaking to the outside, and increases the coupling force between the frame 120 and the cylinder 140 . can be increased In addition, the plurality of sealing members may further include a third sealing member provided at a portion where the frame 120 and the inner stator 134 are coupled and inserted into an installation groove provided on an outer surface of the frame 120 . Here, the first to third sealing members may have a ring shape.

The operation of the linear compressor 100 described above is as follows.

First, when a current is applied to the driving unit 130 , a magnetic flux may be formed in the outer stator 131 by the current flowing through the coil 132b. The magnetic flux formed in the outer stator 131 generates an electromagnetic force, and the mover 135 having a permanent magnet may linearly reciprocate by the generated electromagnetic force. This electromagnetic force is generated in the direction (forward direction) of the piston 150 toward top dead center (TDC) during the compression stroke, and the piston 150 moves toward the bottom dead center (BDC) during the suction stroke. ) may occur alternately in the direction toward (rear direction). That is, the driving unit 130 may generate thrust, which is a force that pushes the mover 135 and the piston 150 in the moving direction.

The piston 150 linearly reciprocating within the cylinder 140 may repeatedly increase or decrease the volume of the compression space 103 .

When the piston 150 moves in a direction (rear direction) to increase the volume of the compression space 103 , the pressure of the compression space 103 may decrease. Accordingly, the suction valve 155 mounted on the front of the piston 150 is opened, and the refrigerant staying in the suction space 102 may be sucked into the compression space 103 along the suction port 154 . This suction stroke may proceed until the piston 150 is positioned at the bottom dead center by maximally increasing the volume of the compression space 103 .

The piston 150 that has reached the bottom dead center may perform a compression stroke while moving in a direction (forward direction) in which the movement direction is changed to decrease the volume of the compression space 103 . During the compression stroke, the suctioned refrigerant may be compressed while the pressure of the compression space 103 is increased. When the pressure of the compression space 103 reaches the set pressure, the discharge valve 171 is pushed out by the pressure of the compression space 103 and is opened from the cylinder 140, and the refrigerant is discharged from the discharge space 104 through the spaced apart space. ) can be discharged. This compression stroke may be continued while the piston 150 moves to the top dead center where the volume of the compression space 103 is minimized.

As the suction stroke and the compression stroke of the piston 150 are repeated, the refrigerant introduced into the receiving space 101 inside the compressor 100 through the suction pipe 114 is transferred to the suction guide 116a, the suction muffler 161 and the inner guide ( 162) flows into the suction space 102 inside the piston 150, and the refrigerant in the suction space 102 flows into the compression space 103 inside the cylinder 140 during the suction stroke of the piston 150. can be imported. After the refrigerant in the compression space 103 is compressed during the compression stroke of the piston 150 and discharged to the discharge space 104 , it is discharged to the outside of the compressor 100 through the loop pipe 115a and the discharge pipe 115 . flow can be formed.

3 is a cross-sectional view of a muffler unit and a metal mesh of a linear compressor according to an embodiment of the present specification. 4 and 5 are schematic views of a mesh member according to an embodiment of the present specification. 6 is a view showing the overall shape of the mesh member according to an embodiment of the present specification. FIG. 7 is a cutaway view of a part of FIG. 6 .

2 to 7, the linear compressor 100 according to an embodiment of the present specification includes a shell 111, a cylinder 140, a piston 150, a muffler unit 160, and a metal mesh. (200) may be included, but may be implemented except for some of these configurations, and does not exclude additional configurations.

The shell 111 may include a suction pipe or a suction pipe 114 for sucking the refrigerant. The cylinder 140 may be disposed inside the shell 111 , and the piston 150 may be disposed inside the cylinder 140 . The piston 150 may reciprocate in the axial direction within the cylinder 140 . The refrigerant introduced into the shell 111 through the suction pipe 114 may be introduced into the piston 150 through the muffler unit 160 .

The muffler unit 160 may be disposed in the shell 111 . At least a portion of the muffler unit 160 may be disposed in the piston 150 . The muffler unit 160 may reduce noise generated when the refrigerant flowing into the shell 111 flows into the piston 150 . The muffler unit 160 may include a suction muffler 161 , an inner guide 162 , and an auxiliary guide 163 .

The suction muffler 161 may be disposed in the shell 111 . The suction muffler 161 may be disposed behind the piston 150 . The suction muffler 161 may be coupled to the third flange part 153 of the piston 150 .

The suction muffler 161 may include a suction body 1611 . The suction body 1611 may be disposed at the rear of the piston. The suction body 1611 may be formed in a cylindrical shape with an open center. An auxiliary guide 163 may be disposed in the suction body 1611 . An inner guide 162 may be coupled to the front of the suction body 1611 .

The suction muffler 161 may include a fourth flange portion 161a. The fourth flange portion 161a may extend radially from the front of the suction body 1611 . The fourth flange portion 161a may be coupled to the third flange portion 153 of the piston 150 . The fourth flange portion 161a may be coupled to the third flange portion 153 of the piston 150 together with the inner flange 1622 of the inner guide 162 .

The suction muffler 161 may include a muffler suction port 1613 . The muffler suction port 1613 may be disposed in a rear region of the suction muffler 161 . The muffler suction port 1613 may be formed on the rear surface of the suction body 1611 . The muffler suction port 1613 may be formed in a central region of the rear surface of the suction body 1611 .

The suction muffler 161 may include a suction guide unit 1612 . The suction guide unit 1612 may be disposed in a rear region of the suction muffler 161 . The suction guide part 1612 may be formed on the rear surface of the suction body 1611 . The suction guide part 1612 may extend forward from the central region of the rear surface of the suction body 1611 . The suction guide part 1612 may be formed in a cylindrical shape. The inner space of the suction guide unit 1612 may be referred to as a muffler suction port 1613 .

The inner guide 162 may be disposed in the inner guide 162 of the piston 150 . The inner guide 162 may communicate with the suction muffler 161 . The inner guide 162 may be coupled to the third flange portion 153 of the piston 150 . The inner guide 162 may provide a flow path of the refrigerant flowing into the piston 150 past the suction muffler 161 and the auxiliary guide 163 .

The inner guide 162 may include an inner body 1621 . The inner body 1621 may extend in an axial direction. The inner body 1621 may be spaced apart from the auxiliary guide 163 . A part of the inner body 1621 may be disposed inside the piston 150 , and another part may be disposed inside the suction muffler 161 . The inner body 1621 may be formed in a cylindrical shape. The inner body 1621 may increase in diameter toward the front. Alternatively, the inner body 1621 may have the same diameter.

The inner guide 162 may include an inner flange portion 1622 . The inner flange 1622 may extend radially from the inner body 1621 . The inner flange 1622 may extend radially in a rear region of the inner body 1621 . The inner flange 1622 may be spaced apart from the rear surface of the inner body 1621 . The inner flange 1622 may be coupled to the third flange portion 153 of the piston 150 . The inner flange 1622 may be disposed between the third flange portion 153 of the piston 150 and the fourth flange portion 161a of the suction muffler 161 .

The inner guide 162 may include an inner coupling portion 1627 . The inner coupling portion 1627 may extend rearwardly from the inner flange 1622 . The internal coupling part 1627 may be disposed on the inner surface of the suction body 1611 of the suction muffler 161 . The inner coupling portion 1627 may be coupled to the auxiliary coupling portion 1634 of the auxiliary guide 163 . The inner coupling portion 1627 may overlap the auxiliary coupling portion 1634 of the auxiliary guide 163 in the axial direction.

The inner guide 162 may include a first protrusion 1623 and a second protrusion 1624 spaced apart from the first protrusion 1623 in the axial direction. The first protrusion 1623 and the second protrusion 1624 may extend radially from the front region of the inner body 1621 . The first protrusion 1623 and the second protrusion 1624 may be formed in a ring shape. The first protrusion 1623 and the second protrusion 1624 may be formed in a region adjacent to the front end of the inner body 1621 .

The refrigerant flowing into the inner suction port 1626 through the auxiliary guide 163 may pass through the inner body 1621 of the inner guide 162 and be introduced into the piston 150 through the inner discharge port 1625 .

The auxiliary guide 163 may be disposed at the rear of the piston 150 . The auxiliary guide 163 may be disposed in the suction muffler 161 . The auxiliary guide 163 may be coupled to the rear of the inner guide 162 .

The auxiliary guide 163 may include an auxiliary body 1631 . The auxiliary body 1631 may extend in an axial direction. The auxiliary body 1631 may be disposed in the suction muffler 161 . The auxiliary body 1631 may be spaced apart from the inner guide 162 . The auxiliary body 1631 may overlap the rear end of the inner body 1621 in the axial direction. The auxiliary body 1631 may be formed in a cylindrical shape.

The auxiliary guide 163 may include an auxiliary flange 1633 . The auxiliary flange 1633 may extend radially from the auxiliary body 1631 . An outer end of the auxiliary flange 1633 may contact an inner surface of the suction body 1611 of the suction muffler 161 .

The auxiliary guide 163 may include an auxiliary coupling unit 1634 . The auxiliary coupling portion 1634 may extend forwardly from the auxiliary flange 1633 . The auxiliary coupling portion 1634 may extend forward from the outer end of the auxiliary flange 1633 . The auxiliary coupling portion 1634 may overlap the inner coupling portion 1627 in an axial direction. The front end of the auxiliary coupling portion 1634 may be coupled to the rear end of the inner coupling portion 1627 .

The auxiliary guide 163 may include an extension 1632 formed in a rear region of the auxiliary body 1631 . The diameter of the extension 1632 may be larger than the diameter of the auxiliary body 1631 . The extension 1632 allows the refrigerant passing through the suction muffler 161 to smoothly flow to the auxiliary guide 163 .

The auxiliary guide 163 may include an auxiliary extension 1637 . The auxiliary extension 1637 may refer to a front area of the auxiliary body 1631 . The auxiliary extension 1637 may be disposed in front of the auxiliary flange 1633 .

The refrigerant flowing into the shell 111 through the suction pipe 114 flows into the muffler suction port 1613 of the suction muffler 161, passes through the inside of the suction body 1611, and flows into the auxiliary suction port 1636. do. The refrigerant passing through the auxiliary body 1631 is introduced into the inner guide 162 through the auxiliary discharge port 1635 , some of which is introduced into the expansion space to attenuate noise generated by the inflow of the refrigerant.

The expansion space is a space between the inner body 1621 , the inner flange 1622 , the inner coupling portion 1627 , the auxiliary coupling portion 1634 , the auxiliary flange 1633 , and the auxiliary body 1631 . Meaning, the metal mesh 200 may be disposed in this expansion space. The expansion space may be formed in a space between the inner flange 1622 , the inner coupling portion 1627 , the auxiliary flange 1633 , and the auxiliary coupling portion 1634 . The expansion space may not overlap the auxiliary body 1631 in the axial direction.

The metal mesh 200 may be disposed between the inner guide 162 and the auxiliary guide 163 . The metal mesh 200 may be disposed in the expansion space formed between the inner guide 162 and the auxiliary guide 163 . The metal mesh 200 may be formed of a metal material. The metal mesh 200 may be made by twisting thin thread-like metal into a mesh shape. The metal mesh 200 reduces the flow rate of the refrigerant flowing into the inner guide 162 passing through the auxiliary guide 163 to the expansion space, while the refrigerant flowing into the inner guide 162 through the auxiliary guide 163 is It can sustain the wave propagating into the expansion space. Through this, when the refrigerant flows into the expansion space in the muffler unit 160, it is possible to prevent the pressure drop of the refrigerant. In addition, it is possible to reduce the noise by dissipating the wave energy in the expansion space in the muffler unit 160 .

Referring to FIG. 4 , the metal mesh 200 may have the same density as a whole. Alternatively, referring to FIG. 5 , in the metal mesh 200 , the density of the edge region may be higher than the density of the central region. Here, the edge region may refer to a region that is in direct contact with or most adjacent to the inner guide 162 and/or the auxiliary guide 163 . Through this, it is possible to reduce the flow rate of the refrigerant flowing into the inner guide 162 through the auxiliary guide 163 to further reduce the flow rate of the refrigerant flowing into the expansion space, thereby preventing the pressure drop of the refrigerant, and dissipating the wave energy to reduce noise.

6 and 7 , the metal mesh 200 includes a first mesh member 210 formed in a cylindrical shape, and a second mesh member 220 extending inward from the inner surface of the first mesh member 210 . ) may be included. The second mesh member 220 may be formed in a central region of the inner surface of the first mesh member 210 . The first mesh member 200 may be disposed in the expansion space between the inner guide 162 and the auxiliary guide 163 . The second mesh member 200 may be disposed between the inner body 1621 of the inner guide 162 and the auxiliary body 1631 of the auxiliary guide 163 . The second mesh member 200 may be disposed between the rear end of the inner body 1621 of the inner guide 162 and the front end of the auxiliary body 1631 of the auxiliary guide 163 . The second mesh member 220 may not overlap the inner space of the auxiliary body 1631 in the axial direction.

That is, the mesh member 200 is made into a single fixed shape, disposed between the inner guide 162 and the auxiliary guide 163 where the expansion space is formed, and the inner guide 162 and the auxiliary guide 163 are combined. In this case, manufacturing easiness can be improved.

8 is an exploded perspective view illustrating a part of a muffler unit of a linear compressor according to another exemplary embodiment of the present specification. 9 is a cross-sectional view of a muffler unit and a metal filter of a linear compressor according to another embodiment of the present specification.

8 and 9 , the linear compressor 100 according to another embodiment of the present specification includes a shell 111 , a cylinder 140 , a piston 150 , a muffler unit 160 , and a metal filter 300 may be included, but may be implemented except for some of the configurations, and does not exclude additional configurations.

A configuration not described below may be understood to be the same as a detailed configuration of the linear compressor 100 according to an embodiment of the present specification.

The auxiliary guide 163 may be disposed in the suction muffler 161 . The auxiliary guide 163 may be coupled to the rear of the inner guide 162 .

The auxiliary body 1631 of the auxiliary guide 163 may be coupled to the inner body 1621 of the inner guide 162 . The front end of the auxiliary body 1631 of the auxiliary guide 163 may be coupled to the rear end of the inner body 1621 of the inner guide 162 . That is, the auxiliary body 1631 of the auxiliary guide 163 according to an embodiment of the present specification is spaced apart from the inner body 1621 of the inner guide 162 in the axial direction, but the auxiliary guide according to another embodiment of the present specification The auxiliary body 1631 of 163 may be coupled to the rear end of the inner body 1621 of the inner guide 162 .

The auxiliary guide 163 may include a metal filter hole 1638 . The metal filter hole 1638 may be formed in the auxiliary body 1631 . The metal filter hole 1638 may be formed in the front region of the auxiliary body 1631 . Specifically, the metal filter hole 1638 may be formed in the auxiliary extension portion 1637 which is a front region of the auxiliary body 1631 and is disposed in front of the auxiliary flange 1633 . A cross-section of the metal filter hole 1638 may be formed in a rectangular shape. The metal filter hole 1638 may communicate with an expansion space formed between the inner guide 162 and the auxiliary guide 163 . A metal filter 300 may be disposed in the metal filter hole 1638 .

The metal filter hole 1638 may include a plurality of metal filter holes 1638 that are spaced apart from each other. The plurality of metal filter holes 1638 may be radially disposed with respect to the central region of the auxiliary guide 163 .

The auxiliary guide 163 may include a step portion 1639 . The step portion 1639 may be formed at the front end of the auxiliary body 1631 . Specifically, the step portion 1639 may be formed at the front end of the auxiliary extension portion 1637 . When the auxiliary guide 163 is coupled to the rear end of the inner guide 162 , the step portion 1639 may serve as a guide for the rear end of the inner body 1621 . In this case, a step portion corresponding to the step portion 1639 may also be formed at the rear end of the inner body 1621 .

The metal filter 300 may be coupled to the auxiliary guide 163 . The metal filter 300 may be disposed on the auxiliary guide 163 . The metal filter 300 may be coupled to the metal filter hole 1638 . The metal filter 300 may include a plurality of metal filters 300 . Each of the plurality of metal filters 300 may be coupled to each of the plurality of metal filter holes 1638 . Alternatively, the metal filter 300 may surround the front region of the auxiliary body 1631 , that is, the outer peripheral surface of the auxiliary extension portion 1637 so as to surround the metal filter hole 1638 .

The metal filter 300 may be formed of a metal material. The metal filter 300 may be formed in the form of a metal thread mesh. An expansion space may be formed between the inner guide 162 and the auxiliary guide 163 and the metal filter 300 . Specifically, the outer circumferential surface of the inner body 1621 of the inner guide 162 , the inner flange 1622 , the inner coupling portion 1627 , the outer circumferential surface of the auxiliary body 1631 of the auxiliary guide 163 , and the auxiliary flange An expansion space may be formed in a space between the 1633 , the auxiliary coupling unit 1634 , and the metal filter 300 .

The metal filter 300 reduces the flow rate of refrigerant flowing into the expansion space from the auxiliary body 1631 of the auxiliary guide 163 and maintains the wave transmitted from the auxiliary body 1631 of the auxiliary guide 163 to the expansion space. can do it Through this, when the refrigerant flows into the expansion space in the muffler unit 160, it is possible to prevent the pressure drop of the refrigerant. In addition, it is possible to reduce the noise by dissipating the wave energy in the expansion space in the muffler unit 160 .

10 is a table comparing the efficiency of the conventional and linear compressors according to embodiments of the present specification.

Referring to FIG. 10 , it can be seen that the efficiency of the refrigerant of the linear compressor 100 according to the embodiments of the present specification is improved by 0.075 compared to the related art. That is, it is possible to improve the compression efficiency of the refrigerant while reducing noise through the metal mesh 200 and the metal filter 300 .

Any or other embodiments of the present specification described above are not mutually exclusive or distinct. Any of the above-described embodiments or other embodiments of the present specification may be combined or combined with each configuration or function.

For example, it means that configuration A described in a specific embodiment and/or drawings may be combined with configuration B described in other embodiments and/or drawings. That is, even if the coupling between the components is not directly described, it means that the coupling is possible except for the case where it is described that the coupling is impossible.

The above detailed description should not be construed as restrictive in all respects and should be considered as exemplary. The scope of this specification should be determined by a reasonable interpretation of the appended claims, and all modifications within the scope of equivalents of this specification are included in the scope of this specification.

100: compressor 101: accommodation space
102: suction space 103: compression space
104: discharge space 110: casing
111: shell 112: first shell cover
113: second shell cover 114: suction pipe
115: discharge pipe 115a: loop pipe
116: first support spring 116a: suction guide
116b: suction side support member 116c: damping member
117: second support spring 117a: support bracket
117b: first support guide 117c: support cover
117d: second support guide 117e: third support guide
118: resonance spring 118a: first resonance spring
118b: second resonance spring 119: spring supporter
119a: body portion 119b: second coupling portion
119c: support 120: frame
121: body portion 122: first flange portion
123: back cover 123a: support bracket
130: drive unit 131: outer stator
132: coil winding body, 132a: bobbin
132b: coil 133: stator core
134: inner stator 135: mover
136: magnet frame 136a: first coupling portion
137: stator cover 140: cylinder
141: second flange portion 142: gas inlet
150: piston 151: head portion
152: guide portion 153: third flange portion
154: suction port 155: suction valve
160: muffler unit 161: suction muffler
161a: fourth flange portion 162: inner guide
170: discharge valve assembly 171: discharge valve
172: valve spring 180: discharge cover assembly
181: first discharge cover 182: second discharge cover
183: third discharge cover 200: metal mesh
300: metal filter

Claims (12)

a shell having a suction pipe for sucking the refrigerant;
a cylinder disposed within the shell;
a piston disposed in the cylinder and reciprocating in an axial direction;
a suction muffler disposed behind the piston;
an inner guide communicating with the suction muffler and disposed inside the piston;
an auxiliary guide disposed inside the suction muffler and coupled to the rear of the inner guide; and
and a metal mesh disposed in an expansion space formed between the inner guide and the auxiliary guide. The method of claim 1,
The metal mesh has a higher density in the edge region than in the central region. The method of claim 1,
The metal mesh includes a first mesh member formed in a cylindrical shape, and a second mesh member extending inward from an inner surface of the first mesh member. The method of claim 1,
The inner guide includes an inner body extending in an axial direction, an inner flange extending radially in a rear region of the inner body, and an inner coupling portion extending rearwardly from the inner flange,
The auxiliary guide includes an auxiliary body overlapping the inner body in an axial direction, an auxiliary flange extending in a radial direction from the auxiliary body, and an auxiliary coupling portion extending forwardly from the auxiliary flange and coupled to the inner coupling portion linear compressor. 5. The method of claim 4,
The internal coupling part and the auxiliary coupling part overlap in an axial direction. 5. The method of claim 4,
The expansion space is formed in a space between the inner flange and the inner coupling portion and the auxiliary flange and the auxiliary coupling portion,
The expansion space does not overlap the auxiliary body in the axial direction. 7. The method of claim 6,
The metal mesh includes a first mesh member formed in a cylindrical shape and disposed in the expansion space, and a second mesh member extending inward from the inner surface of the first mesh member and disposed between the inner body and the auxiliary body a linear compressor. 8. The method of claim 7,
The second mesh member does not overlap the inner space of the auxiliary body in the axial direction. 5. The method of claim 4,
The inner body and the auxiliary body are axially spaced apart linear compressor. a shell having a suction pipe for sucking the refrigerant;
a cylinder disposed within the shell;
a piston disposed in the cylinder and reciprocating in an axial direction;
a suction muffler disposed behind the piston;
an inner guide communicating with the suction muffler and disposed inside the piston;
an auxiliary guide disposed inside the suction muffler and coupled to the rear of the inner guide; and
A metal filter coupled to the auxiliary guide,
An expansion space is formed between the inner guide, the auxiliary guide, and the metal filter. 11. The method of claim 10,
The inner guide includes an inner body extending in an axial direction, an inner flange extending radially in a rear region of the inner body, and an inner coupling portion extending rearwardly from the inner flange,
The auxiliary guide includes an auxiliary body coupled to the rear surface of the inner body, an auxiliary flange extending in a radial direction from the auxiliary body, and an auxiliary coupling portion extending forwardly from the auxiliary flange and coupled to the inner coupling portion; and a metal filter hole formed in the auxiliary body and communicating with the expansion space,
The metal filter is disposed in the metal filter hole. 12. The method of claim 11,
The auxiliary guide is formed on the front surface of the auxiliary body and linear compressor including a step portion coupled to the inner body.

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