CN210239937U

CN210239937U - Linear compressor

Info

Publication number: CN210239937U
Application number: CN201920883154.8U
Authority: CN
Inventors: Sang-Ik Son; 孙尚翼; Dong-Han Kim; 金烔汉; Woo-Joo Jeon; 全宇宙
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 2019-02-12
Filing date: 2019-06-12
Publication date: 2020-04-03
Anticipated expiration: 2029-06-12
Also published as: KR102217342B1; KR20200098291A

Abstract

According to the utility model discloses a linear compressor, it includes: a piston that reciprocates in an axial direction; a cylinder provided in such a manner as to accommodate the piston; a gas inflow passage recessed radially inward from an outer peripheral surface of the cylinder; a placement groove that is further recessed inward in the radial direction from the gas inflow channel; a filter member disposed in the gas inflow passage; and a filter fixing member inserted into the seating groove and pressing the filter member toward an inner side of the cylinder. And, other embodiments may be implemented. This has the advantage that the filter member can be prevented from slipping off the cylinder or idling.

Description

Linear compressor

Technical Field

The utility model relates to a linear compressor.

Background

Generally, a Compressor (Compressor) is a mechanical device that receives power from a power generation device such as an electric motor or a turbine, compresses air, a refrigerant, or other various working gases, and increases the pressure, and is widely used in the household appliance and the entire industrial field.

Such compressors may be classified into a reciprocating compressor (reciprocating compressor), a rotary compressor (rotary compressor), and a scroll compressor (scroll compressor).

In the reciprocating compressor, a compression space for compressing a working gas is formed between a Piston (Piston) and a Cylinder (Cylinder), the Piston linearly reciprocates inside the Cylinder, and compresses a refrigerant flowing into the compression space.

Recently, among the reciprocating compressors, a linear compressor has been developed in which a piston is directly connected to a driving motor performing a reciprocating linear motion, thereby improving compression efficiency without causing a mechanical loss due to motion conversion and having a simple structure.

A linear compressor is disclosed in korean laid-open patent No. 10-2016-.

In the linear compressor disclosed in the prior art document, a gas bearing technology is disclosed which supplies a refrigerant gas to a space between a cylinder and a piston and performs a bearing function. The refrigerant gas flows toward the outer circumferential surface of the piston through an Orifice (Orifice) formed in the cylinder, thereby performing a bearing function with respect to the reciprocating piston.

In addition, in order to improve the compression efficiency of the linear compressor, it is necessary to minimize the consumption flow rate of the refrigerant gas used as the gas bearing. In order to reduce the consumption flow rate of the refrigerant gas, it is necessary to reduce the diameter or the number of the orifices formed in the cylinder, but if the diameter of the orifices is reduced or the number of the orifices is reduced, the orifices are blocked, which greatly affects the reliability of the compressor.

That is, when the orifice diameter of the cylinder is small or the number of orifices is small, a clogging phenomenon occurs due to oil or a mixture of oil and dust, etc., and thus there is a problem in that the function of the gas bearing is significantly reduced.

In order to solve such a problem, the conventional document is used as a filter member of a sediment filter system in which a thread (thread) made of a pet (polyethylene terephthalate) material is wound around a gas inflow passage formed in an outer circumferential surface of a cylinder.

However, in this case, when the filter is exposed to operating conditions of the compressor in which the pressure and temperature change rapidly for a long time, there is a problem in that the filtering performance is deteriorated as the time is longer because the tension of the filter is reduced. If the filtering performance is significantly reduced, there is a problem in that the clogging phenomenon of the orifice is increased by the oil or dust mixture.

SUMMERY OF THE UTILITY MODEL

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a linear compressor in which a filter member provided in a cylinder can be firmly fixed.

Another object of the present invention is to provide a linear compressor capable of maintaining tension of a filter by pressing a filter member to an inner side of a cylinder even if the compressor is operated for a long time.

It is still another object of the present invention to provide a linear compressor capable of mounting and separating a filter fixing member using a simple structure.

In order to achieve the above object, a linear compressor according to an embodiment of the present invention includes: a piston that reciprocates in an axial direction; and a cylinder for accommodating the piston. The cylinder is formed with: a gas inflow passage recessed radially inward from an outer peripheral surface of the cylinder; and a placement groove that is further recessed inward in the radial direction from the gas inflow channel.

In this case, the filter member is disposed in the gas inflow passage, and a filter fixing member for pressing the filter member toward the inside of the cylinder is inserted into the installation groove, so that the filter member can be pressed such that a part of the filter member is brought into close contact with the bottom surface of the installation groove.

With such a filter fixing member, the filter member can be firmly fixed to the cylinder, and a phenomenon in which the filter member is detached from the inside of the cylinder or idles can be prevented. And, by the filter fixing member pressing a portion of the filter member toward the inside of the cylinder, the tension of the filter member is maintained even if the compressor is operated for a long time, so that the reduction of the filter performance can be minimized.

Also, the gas inflow path may extend in a circumferential direction of the cylinder, and the filter member may be wound and disposed along the gas inflow path in the circumferential direction. In this case, the seating groove may be further recessed in the axial direction from the gas inflow passage.

According to an embodiment, the filter fixing member may include: a cover part received in the seating groove and covering a portion of the filter member; a first seating portion extending from the cover portion and seated inside the seating groove; and a second seating portion extending from the cover portion and seated inside the seating groove.

At this time, the first seating portion may extend from one end portion of the cover portion toward an inner side of the seating groove, and the second seating portion may extend from the other end portion of the cover portion toward the inner side of the seating groove. At this time, a portion of the filter member may be disposed between the first seating portion and the second seating portion. Thereby, the filter fixing member can be securely inserted inside the cylinder.

And, the first and second seating portions respectively include first surfaces forming a plane and second surfaces forming a curved surface, the respective first surfaces may be disposed to face each other, and the respective second surfaces may be arcuately projected toward directions opposite to each other.

Wherein the filter member may include a thread (thread) formed of a pet (polyethylene terephthalate) material. Also, the filter fixing member may be formed of an engineering plastic material.

According to another embodiment, the filter fixing member may include: a cover part received in the seating groove and covering a portion of the filter member; and a seating portion formed by both side ends of the cover being respectively arc-shaped, and inserted into both sides of the seating groove.

According to still another embodiment, the filter fixing member may include: a plate disposed inside the seating groove; and an extension portion extending upward from the plate, the extension portion covering a portion of the filter member by plastic deformation.

At the moment, the plate is tightly attached to the bottom surface of the placement groove, and the extension part can be tightly attached to the inner side surface of the placement groove. The extension may be formed to have the same width as that of the plate.

And, the extension part includes: a first extension portion extending upward from one end portion of the plate; and a second extending portion extending upward from the other end portion of the plate, the first extending portion and the second extending portion being capable of being brought into close contact with the filter member by being plastically deformed in a direction in which the first extending portion and the second extending portion approach each other.

Drawings

Fig. 1 is a perspective view of a linear compressor according to a first embodiment of the present invention.

Fig. 2 is an exploded perspective view of a compressor body accommodated in a casing of a linear compressor according to a first embodiment of the present invention.

Fig. 3 is a view showing a section taken along line IV-IV' of fig. 1.

Fig. 4 is a perspective view of the cylinder according to the first embodiment of the present invention.

Fig. 5 is a view showing a state in which a filter member is disposed in a mounting groove of a cylinder according to a first embodiment of the present invention.

Fig. 6 is a view showing a section taken along line II-II' of fig. 5.

Fig. 7 is a perspective view of a filter fixing member according to a first embodiment of the present invention.

Fig. 8 is a diagram showing a state in which the filter fixing member according to the first embodiment of the present invention is disposed in the installation groove of the cylinder.

Fig. 9 is a view showing a cross section taken along line III-III' of fig. 8.

Fig. 10 is a perspective view of a filter fixing member according to a second embodiment of the present invention.

Fig. 11 is a sectional view showing a state where a filter fixing member according to a second embodiment of the present invention is disposed in a mounting groove of a cylinder.

Fig. 12 is a perspective view of a cylinder according to a third embodiment of the present invention.

Fig. 13 is a perspective view of a filter fixing member according to a third embodiment of the present invention.

Fig. 14A is a sectional view taken along line VI-VI' of fig. 12.

Fig. 14B is a sectional view showing a state where the filter fixing member is disposed in the disposition groove of the cylinder in fig. 14A.

Fig. 14C is a sectional view showing a state where the filter member is disposed in the disposition groove in fig. 14B.

Fig. 14D is a sectional view showing a state in which the filter member in fig. 14C is fixed by the filter fixing member.

Fig. 15 is a perspective view of a filter fixing member according to a fourth embodiment of the present invention.

Fig. 16A is a sectional view showing a mounting groove of a cylinder according to a fourth embodiment of the present invention.

Fig. 16B is a sectional view showing a state where the filter fixing member is disposed in the disposition groove in fig. 16A.

Fig. 16C is a sectional view showing a state where the filter member is disposed in the disposition groove in fig. 16B.

Fig. 16D is a sectional view showing a state in which the filter member in fig. 16C is fixed by the filter fixing member.

Detailed Description

Referring to fig. 1, a linear compressor 10 according to a first embodiment of the present invention includes: a housing (s hell) 101; and case covers 102, 103 coupled to the case 101. In a broad sense, the housing covers 102, 103 can be understood as a structure of the housing 101.

A leg 50 may be coupled to the lower side of the housing 101. The leg 50 may be coupled to a base of a product for installing the linear compressor 10. For example, the product comprises a refrigerator, and the base may comprise a base of a machine compartment of the refrigerator. As another example, the product may include an outdoor unit of an air conditioner, and the base may include a base of the outdoor unit.

The housing 101 has a substantially cylindrical shape and can be placed horizontally in a lateral direction or in an axial direction. The housing 101 may extend long in the lateral direction with a slightly lower height in the radial direction, based on fig. 1. That is, since the linear compressor 10 may have a low height, the height of the machine room can be reduced, for example, when the linear compressor 10 is provided at a machine room base of a refrigerator.

A terminal 108 may be provided on an outer surface of the housing 101. The wire 108 is understood as a structure for transmitting an external power to a motor assembly 140 (refer to fig. 3) of the linear compressor. In particular, the connection 108 may be connected to a lead wire of the coil 141c (refer to fig. 3).

A bracket 109 is provided on the outside of the wiring 108. The support 109 may include a plurality of supports surrounding the wire 108. The bracket 109 may function to protect the wire 108 from external impact or the like.

Both side portions of the housing 101 are formed with openings. The case covers 102 and 103 may be coupled to both side portions of the case 101 forming the opening. In detail, the housing covers 102, 103 include: a first case cover 102 coupled to one side portion of the case 101 where an opening is formed; and a second housing cover 103 coupled to the other side portion of the housing 101 where the opening is formed. The internal space of the housing 101 can be sealed by the housing covers 102 and 103.

With reference to fig. 1, the first housing cover 102 may be located at a right side portion of the linear compressor 10, and the second housing cover 103 may be located at a left side portion of the linear compressor 10. In other words, the first housing cover 102 and the second housing cover 103 may be configured in such a manner as to face each other.

The linear compressor 10 further includes a plurality of

pipes

104, 105, and 106 provided in the casing 101 or the casing covers 102 and 103 and capable of sucking, discharging, and injecting a refrigerant.

The plurality of

tubes

104, 105, 106 comprises: a suction pipe 104 for sucking the refrigerant into the linear compressor 10; a discharge pipe 105 for discharging the compressed refrigerant from the linear compressor 10; and a process pipe 106 for supplementing the linear compressor 10 with a refrigerant.

For example, the suction tube 104 may be coupled to the first housing cover 102. Refrigerant may be sucked into the interior of the linear compressor 10 in an axial direction through the suction pipe 104.

The discharge pipe 105 may be coupled to an outer circumferential surface of the casing 101. The refrigerant sucked through the suction pipe 104 may flow in the axial direction and be compressed. Further, the compressed refrigerant may be discharged through the discharge pipe 105. The discharge pipe 105 may be disposed closer to the second housing cover 103 than the first housing cover 102.

The process tube 106 may be coupled to the outer circumferential surface of the housing 101. An operator may inject a refrigerant into the linear compressor 10 through the process pipe 106.

To avoid interference with the discharge pipe 105, the process pipe 106 may be coupled to the enclosure 101 at a different height than the discharge pipe 105. The height is understood to be the distance from the leg 50 towards the vertical (or radial) direction. The discharge pipe 105 and the process pipe 106 are coupled to the outer peripheral surface of the casing 101 at different heights, so that the convenience of the worker can be improved.

At least a portion of the second housing cover 103 may be adjacently located on the inner circumferential surface of the housing 101 corresponding to the location where the process tube 106 is coupled. In other words, at least a portion of the second housing cover 103 may function as a resistance to the refrigerant injected through the process tube 106.

Therefore, from the viewpoint of the flow path of the refrigerant, the flow path of the refrigerant flowing in through the process pipe 106 is formed to have a size: the second housing cover 103 is made smaller while entering the inner space of the housing 101, and is made larger again after passing through the second housing cover 103. In this process, the pressure of the refrigerant is reduced, whereby the refrigerant can be vaporized, and in this process, the oil contained in the refrigerant can be separated. Therefore, the oil-separated refrigerant flows into the piston 130 (see fig. 3), and the compression performance of the refrigerant can be improved. The oil component is understood to be the working oil present in the cooling system.

A cover support portion 102a (see fig. 3) is provided on an inner surface of the first housing cover 102. A second supporting device 185 described later may be coupled to the cover supporting portion 102 a. The cover supporting part 102a and the second supporting means 185 may be understood as means for supporting the body of the linear compressor 10.

The main body of the linear compressor 10 is a member disposed inside the casing 101, and may include, for example, a driving part reciprocating back and forth and a supporting part supporting the driving part.

The driving part may include components such as a piston 130, a magnet 146, a supporter 137, and a muffler 150, which will be described later. Further, the support portion may include components such as resonance springs 176a, 176b, a rear cover 170, a stator cover 149, a first supporting device 165, and a second supporting device 185, which will be described later.

A stopper (stopper)102b (see fig. 3) may be provided on the inner surface of the first housing cover 102. The stop 102b is understood as: a structure for preventing the body of the linear compressor 10, particularly the motor assembly 140 from being damaged by collision with the casing 101 due to vibration, impact, or the like generated during the handling of the linear compressor 10.

The stopper 102b is disposed adjacent to a rear cover 170, which will be described later, and when the linear compressor 10 shakes, the rear cover 170 interferes with the stopper 102b, thereby preventing impact from being transmitted to the motor assembly 140.

A spring fastening portion 101a (refer to fig. 3) may be provided on an inner circumferential surface of the housing 101. For example, the spring fastening portion 101a may be disposed at a position adjacent to the second housing cover 103. The spring fastening portion 101a may be coupled to a first support spring 166 of a first support device 165, which will be described later. The spring fastening portion 101a is combined with the first supporting means 165, whereby the body of the compressor can be stably supported inside the casing 101.

Fig. 2 is an exploded perspective view of a compressor body accommodated inside a casing of a linear compressor according to a first embodiment of the present invention, and fig. 3 is a view showing a cross section taken along line IV-IV' of fig. 1.

Referring to fig. 2 and 3, a linear compressor 10 according to a first embodiment of the present invention includes: a cylinder 120 provided inside the housing 101; a piston 130 reciprocating linearly inside the cylinder 120; and a motor assembly 140 as a linear motor providing a driving force to the piston 130. The piston 130 may reciprocate in an axial direction when the motor assembly 140 is driven.

And, the linear compressor 10 further includes: a suction muffler 150 coupled to the piston 130 and for reducing noise generated from the refrigerant sucked through the suction pipe 104. The refrigerant sucked through the suction pipe 104 flows toward the inside of the piston 130 through the suction muffler 150. For example, the flow noise of the refrigerant can be reduced during the refrigerant passes through the suction muffler 150.

The suction muffler 150 includes a plurality of

mufflers

151, 152, 153. The plurality of mufflers includes a first muffler 151, a second muffler 152 and a third muffler 153, which are combined with each other.

The first muffler 151 is located inside the piston 130, and the second muffler 152 is coupled to a rear side of the first muffler 151. Further, the third muffler 153 may receive the second muffler 152 therein and extend rearward of the first muffler 151. The refrigerant sucked through the suction pipe 104 may sequentially pass through the third muffler 153, the second muffler 152, and the first muffler 151 from the viewpoint of the flow direction of the refrigerant. In this process, the flow noise of the refrigerant can be reduced.

The suction muffler 150 further includes a muffler filter 155. The noise elimination filter 155 may be located at a boundary surface where the first muffler 151 and the second muffler 152 are combined. For example, the noise elimination filter 155 may have a circular shape, and an outer circumferential portion of the noise elimination filter 155 may be supported between the first muffler 151 and the second muffler 152.

Hereinafter, the direction is defined.

"axial" is to be understood as the direction in which the piston 130 reciprocates, i.e., transverse in fig. 3. In the "axial direction", a direction from the suction pipe 104 toward the compression space P, that is, a direction in which the refrigerant flows is defined as "forward", and a direction opposite thereto is defined as "backward". When the piston 130 moves forward, the compression space P may be compressed.

On the other hand, the "radial direction" may be understood as a direction perpendicular to the direction in which the piston 130 reciprocates, and may be understood as a longitudinal direction in fig. 3.

The piston 130 includes: a piston body 131 having a substantially cylindrical shape; and a piston flange portion 132 extending in the radial direction from the piston body 131. The piston body 131 is capable of reciprocating inside the cylinder 120, and the piston flange 132 is capable of reciprocating outside the cylinder 120.

The cylinder 120 includes: a cylinder body 121 extending in the axial direction; and a cylinder flange 122 provided outside a front portion of the cylinder body 121. At least a part of the first muffler 151 and at least a part of the piston body 131 are accommodated inside the cylinder 120.

A gas inflow passage 123 (see fig. 4) is formed in the cylinder body 121, and at least a part of the refrigerant discharged through a discharge valve 161 described later flows into the gas inflow passage 123. The gas inflow passage 123 is formed in the outer circumferential surface of the cylinder body 121.

The gas inflow passage 123 is formed by being recessed radially inward from the outer circumferential surface of the cylinder body 121. The gas inflow path 123 may extend in a circumferential direction of the cylinder body 121. The gas inflow passages 123 may be arranged in plurality on the outer circumferential surface of the cylinder body 121 at intervals in the axial direction.

A filter member 127 (see fig. 5) described later is disposed in the gas inflow passage 123. The filter member 127 may be wound toward the inside along the gas inflow passage 123.

A filter fixing member 200 (see fig. 8) for fixing the filter member 127 is provided in the gas inflow passage 123. The filter fixing member 200 may be inserted into a position inside the gas inflow path 123 to fix the filter member 127.

A compression space P is formed inside the cylinder 120, and the refrigerant is compressed in the compression space P by the piston 130. A suction hole 133 for allowing the refrigerant to flow into the compression space P is formed in a front surface portion of the piston body 131, and a suction valve 135 for selectively opening the suction hole 133 is provided in front of the suction hole 133.

A fastening hole is formed in a front surface portion of the piston body 131, and a predetermined fastening member is coupled to the fastening hole. In detail, the fastening hole is located at the center of the front surface portion of the piston body 131, and a plurality of suction holes 133 are formed to surround the fastening hole. The fastening member penetrates the suction valve 135 and is coupled to the fastening hole, thereby fixing the suction valve 135 to the front surface of the piston body 131.

In front of the compression space P are provided: a discharge cap 160 for forming a discharge space 160a for the refrigerant discharged from the compression space P; and

discharge valve assemblies

161 and 163 coupled to the discharge cap 160 and selectively discharging the refrigerant compressed in the compression space P. The discharge space 160a includes a plurality of spaces defined by the inner wall of the discharge cap 160. The plurality of space portions are arranged in the front-rear direction and can communicate with each other.

The

spit valve assemblies

161, 163 include: a discharge valve 161 that is opened when the pressure in the compression space P is equal to or higher than a discharge pressure, and that allows the refrigerant to flow into the discharge space 160a of the discharge cap 160; and a spring assembly 163 disposed between the discharge valve 161 and the discharge cap 160 for providing an elastic force in an axial direction.

The spring assembly 163 includes: a valve spring 163 a; and a spring support portion 163b for supporting the valve spring 163a to the discharge cap 160. For example, the valve spring 163a may include a plate spring. The spring support portion 163b may be integrally injection-molded to the valve spring 163a through an injection molding process.

The discharge valve 161 is coupled to the valve spring 163a, and a rear portion or a rear surface of the discharge valve 161 is supported on a front surface of the cylinder 120. When the discharge valve 161 is supported on the front surface of the cylinder 120, the compression space P is kept in a sealed state, and when the discharge valve 161 is spaced apart from the front surface of the cylinder 120, the compression space P is opened, and the compressed refrigerant in the compression space P can be discharged.

Therefore, the compression space P is understood as a space formed between the suction valve 135 and the discharge valve 161. The suction valve 135 may be formed at one side of the compression space P, and the discharge valve 161 may be disposed at the other side of the compression space P, i.e., at the opposite side of the suction valve 135.

When the pressure of the compression space P is lower than the discharge pressure and equal to or lower than the suction pressure while the piston 130 is linearly reciprocating inside the cylinder 120, the suction valve 135 is opened, and the refrigerant is sucked into the compression space P. On the other hand, if the pressure of the compression space P is equal to or higher than the suction pressure, the refrigerant in the compression space P is compressed in a state where the suction valve 135 is closed.

When the pressure in the compression space P is equal to or higher than the discharge pressure, the valve spring 163a is deformed forward, and the discharge valve 161 is opened, so that the refrigerant is discharged from the compression space P to the discharge space 160 a. When the discharge of the refrigerant is completed, the valve spring 163a provides a restoring force to the discharge valve 161, thereby closing the discharge valve 161.

The linear compressor 10 further includes a head pipe 162a coupled to the discharge head 160 and configured to discharge the refrigerant flowing through the discharge space 160a of the discharge head 160. For example, the cover tube 162a may be made of a metal material.

Further, the linear compressor 10 further includes an annular pipe 162b coupled to the head pipe 162a, and configured to deliver the refrigerant flowing in the head pipe 162a to the discharge pipe 105. One side of the annular tube 162b may be coupled to the cap tube 162a, and the other side may be coupled to the discharge tube 105.

The annular tube 162b is made of a flexible material and may be formed relatively long. The annular pipe 162b may extend from the cover pipe 162a along the inner circumferential surface of the casing 101 in a curved manner, and may be coupled to the discharge pipe 105. For example, the annular tube 162b may have a wound configuration.

The linear compressor 10 further comprises a frame 110. The frame 110 is understood as a structure for fixing the cylinder 120. For example, the air cylinder 120 may be pressed (press fitting) to the inside of the frame 110. The cylinder 120 and the frame 110 may be made of aluminum or an aluminum alloy.

The frame 110 includes: a frame body 111 having a substantially cylindrical shape; and a frame flange portion 112 extending in a radial direction from the frame body 111. The frame body 111 is disposed so as to surround the cylinder 120. That is, the cylinder 120 may be accommodated inside the frame body 111. Further, the frame flange portion 112 may be coupled to the discharge cap 160.

Further, a gas hole 114 is formed in the frame 110, and the gas hole 114 is used to flow at least a part of the refrigerant discharged through the discharge valve 161 toward the cylinder 120. The gas hole 114 is used to communicate the frame flange 112 with the frame body 111.

A filter for filtering foreign substances in the refrigerant flowing into the gas hole 114 is disposed in the frame flange 112. The filter may be press-fitted into an inner space formed in the frame flange portion 112.

The motor assembly 140 includes: an outer stator 141; an inner stator 148 disposed at an interval toward an inner side of the outer stator 141; and a magnet 146 positioned in a space between the outer stator 141 and the inner stator 148.

The magnet 146 may linearly reciprocate by a mutual electromagnetic force with the outer stator 141 and the inner stator 148. The magnet 146 may be a single magnet having one pole, or may be a plurality of side magnets having three poles.

The inner stator 148 is fixed to the outer circumference of the frame body 111. In addition, the inner stator 148 may be formed by stacking a plurality of lamination sheets in a radial direction at an outer side of the frame body 111.

The outer stator 141 includes

coil winding bodies

141b, 141c, and 141d and a stator core 141 a. The coil winding body includes: a bobbin (bobbin)141 b; and a coil 141c wound along a circumferential direction of the bobbin 141 b.

The coil winding body further includes a terminal portion 141d that guides a power supply line connected to the coil 141c such that the power supply line is drawn out or exposed to the outside of the outer stator 141. The terminal portion 141d may extend through the frame flange portion 112.

The stator core 141a includes a plurality of core blocks (core blocks), and the plurality of core blocks is formed by stacking a plurality of stacked plates (lamination) in a circumferential direction. The plurality of core blocks may be arranged to surround at least a portion of the

coil winding bodies

141b and 141 c.

A stator cover 149 is provided at one side of the outer stator 141. At this time, one side of the outer stator 141 may be supported by the frame flange part 112, and the other side may be supported by the stator cover 149. In order, the frame flange portion 112, the outer stator 141, and the stator cover 149 are provided in this order in the axial direction.

Also, the linear compressor 10 further includes a cover fastening member 149a for fastening the stator cover 149 and the frame flange portion 112. The cover fastening member 149a may penetrate the stator cover 149, extend forward toward the frame flange 112, and be coupled to the frame flange 112.

The linear compressor 10 further includes a rear cover 170 coupled to the stator cover 149, extending rearward, and supported by a second support device 185.

In detail, the rear cover 170 includes three support legs, which may be coupled to a rear surface of the stator cover 149. Spacers (spacers) 181 may be provided between the three support legs and the rear surface of the stator cover 149. By adjusting the thickness of the spacer 181, the distance from the stator cover 149 to the rear end of the rear cover 170 can be determined.

The linear compressor 10 further includes an inflow guide portion 156 coupled to the rear cover 170, and guiding the refrigerant to flow into the suction muffler 150. At least a portion of the inflow guide portion 156 may be inserted inside the suction muffler 150.

Also, the linear compressor 10 further includes a plurality of

resonant springs

176a and 176b, and a natural frequency of each of the plurality of

resonant springs

176a and 176b is adjusted such that the piston 130 can perform a resonant motion. The plurality of resonance springs 176a and 176b perform stable movement of the driving part, which reciprocates inside the linear compressor 10, and can reduce generation of vibration and noise caused by the movement of the driving part.

The linear compressor 10 further includes a first supporting device 165 coupled to the discharge cap 160 and supporting one side of the body of the compressor 10. The first supporting means 165 may be disposed adjacent to the second housing cover 103 so as to elastically support the body of the compressor 10. In detail, the first supporting means 165 includes a first supporting spring 166. The first supporting spring 166 may be coupled to the spring fastening portion 101 a.

The linear compressor 10 further includes a second supporting device 185 coupled to the rear cover 170 to support the other side of the body of the compressor 10. The second supporting means 185 may be combined with the first housing cover 102 to elastically support the body of the compressor 10. In detail, the second supporting means 185 includes a second supporting spring 186. The second support spring 186 may be coupled to the cover support portion 102 a.

Also, the linear compressor 10 includes a plurality of sealing members for increasing a coupling force between the frame 110 and components around the frame 110. A plurality of the sealing members may have a ring shape.

In detail, the plurality of sealing members include a first sealing member 127 provided at a portion where the frame 110 and the discharge cap 160 are coupled. And, the plurality of sealing members further includes: a second sealing member 128 and a third sealing member 129a provided to a portion where the frame 110 and the cylinder 120 are combined; and a fourth sealing member 129b provided to a portion where the frame 110 and the inner stator 148 are combined.

Hereinafter, the filter fixing member of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 4 is a perspective view of a cylinder according to a first embodiment of the present invention, fig. 5 is a view showing a state in which a filter member is disposed in a seating groove of the cylinder according to the first embodiment of the present invention, and fig. 6 is a view of a cross section taken along line II-II' of fig. 5.

Referring to fig. 4 to 6, the linear compressor 10 includes: a cylinder 120; and a filter member 127 wound around an outer circumferential surface of the cylinder 120.

The cylinder 120 includes: a cylinder body 121; and a cylinder flange 122 provided outside the front portion of the cylinder body 121.

The cylinder body 121 extends long in the lateral or axial direction, and may have a cylindrical shape with a hollow inside. Both ends of the cylinder body 121 are open and form a predetermined internal space. The piston 130 is disposed inside the cylinder body 121, and the frame 110 is disposed outside the cylinder body.

The cylinder 120 further includes a gas inflow passage 123.

The gas inflow passage 123 is a space in which a part of the refrigerant flows into the cylinder 120. In the present embodiment, a part of the refrigerant discharged through the discharge valve 161 flows into the gas hole 114 formed in the frame 110, and the refrigerant flowing into the gas hole 114 may flow along the gas inflow passage 123 on the outer circumferential surface of the cylinder 120.

Specifically, the gas inflow passage 123 is recessed radially inward from the outer peripheral surface of the cylinder body 121. That is, the gas inflow path 123 may extend from the outer circumferential surface of the cylinder body 121 toward the inner circumferential surface thereof.

The gas inflow passage 123 may extend in the circumferential direction of the cylinder body 121. For example, the gas inflow passage 123 may be formed in a circular band shape on the outer circumferential surface of the cylinder body 121.

The gas inflow path 123 may have a predetermined first width W1 and may be formed to be recessed by a first depth D1. The "width" may refer to a length extending toward an axial direction of the cylinder 120. The "depth" may refer to a length extending toward a radius direction of the cylinder 120.

The plurality of gas inflow passages 123 may be arranged at intervals in the axial direction on the outer circumferential surface of the cylinder body 121. In the present embodiment, the gas inflow path 123 is formed in two on the outer circumferential surface of the cylinder body 121, but is not limited thereto. For example, the gas inflow path 123 may be provided singly or in three or more on the outer circumferential surface of the cylinder body 121.

A filter member 127, which will be described later, is disposed in the gas inflow passage 123. The filter member 127 may be provided to be wound around the inside of the gas inflow passage 123.

The cylinder 120 further includes a gas inlet 124 penetrating from the gas inlet flow path 123 to the inner circumferential surface of the cylinder 120.

The gas inlet 124 is understood to be a passage through which the refrigerant flowing through the gas inlet flow path 123 flows into the inside of the cylinder 120. The gas inlet 124 penetrates the inner surface of the gas inlet flow path 123 toward the inside of the cylinder 120. For example, the gas inlet 124 may be formed to penetrate from the inner bottom surface of the gas inlet flow path 123 to the inner circumferential surface of the cylinder 120.

The plurality of gas inlets 124 may be formed at intervals in the circumferential direction of the gas inlet channel 123. Accordingly, the refrigerant flowing into the gas inflow passage 123 flows along the circumferential surface of the gas inflow passage 123, and then uniformly flows into the cylinder 120 through the gas inflow port 124.

The cylinder 120 further includes a seating groove 125, and a filter fixing member 200, which will be described later, is seated in the seating groove 125.

The seating groove 125 is formed by further recessing the gas inflow passage 123 inward in the radial direction of the cylinder 120. The seating groove 125 may be formed to extend further in the axial direction of the gas inflow passage 123.

That is, the seating groove 125 has a second width W2 greater than the first width W1, and may be concavely formed with a second depth D2 greater than the first depth D1.

According to this configuration, if the filter member 127 is disposed inside the gas inflow passage 123, the bottom surface 125a of the installation groove 125 and the installation surface 127a of the filter member 127 can be spaced apart from each other. That is, the bottom surface 125a of the seating groove 125 and the seating surface 127a of the filter member 127 may be spaced apart by a predetermined interval L1 in the radial direction of the cylinder 120.

The seating groove 125 is a portion for seating a filter fixing member 200 described later. A portion of the filter member 127 is placed in the seating groove 125, and the filter fixing member 200 may fix a portion of the filter member 127.

A plurality of the installation grooves 125 may be disposed inside the gas inflow passage 123. For example, a plurality of placement grooves 125 may be disposed at intervals in the circumferential direction in the gas inflow channel 123.

In this case, the plurality of seating grooves 125 may be disposed between the plurality of gas holes 124 formed along the circumferential direction of the cylinder 120. For example, the seating grooves 125 and the gas holes 124 may be alternately arranged.

Therefore, a plurality of filter fixing members 200 may be provided along the circumferential direction of the gas inflow path 123, so that the filter member 127 can be firmly fixed to the cylinder 120.

The filter member 127 is provided so as to be wound around the inside of the gas inflow passage 123. The filter member 127 includes a thread (thread) formed of a polyethylene terephthalate (PET) material. The filter member 127 may be understood as a "thread filter". Further, the filter member 127 may be wound a plurality of times along the gas inflow path 123 to serve as a precipitation filter.

The filter member 127 is in close contact with the inner surface of the gas inflow passage 123. Further, a part of the filter member 127 may be exposed through a seating groove 125 formed in the gas inflow passage 123. That is, a portion of the filter member 127 may be spaced apart from the inner surface or bottom surface 125a of the seating groove 125.

Fig. 7 is a perspective view of a filter fixing member according to a first embodiment of the present invention, fig. 8 is a view showing a state in which the filter fixing member according to the first embodiment of the present invention is disposed in a disposition groove of a cylinder, and fig. 9 is a view showing a cross section taken along line III-III' of fig. 8.

Referring to fig. 7 to 9, the linear compressor 10 further includes a filter fixing member 200 for fixing the filter member 127 to the cylinder 120.

The filter fixing member 200 is a member that is seated in a seating groove 125 formed at the cylinder 120, thereby fixing the filter member 127. The filter fixing member 200 may be provided with at least one or more gas inflow passages 123, so that the filter member 127 can be fixed.

In this embodiment, the filter fixing member 200 may be formed of a metal material or an engineering plastic material.

Specifically, the filter fixing member 200 includes: a cover part 210 received in the seating groove 125 and for covering the filter member 127; and

seating portions

220, 230 seated in the seating grooves 125.

The cover 210 may extend long in the axial direction, and may be formed in a rod shape, for example. The cover 210 is disposed to cover at least a part of the installation groove 125.

In this case, the cover 210 may be disposed in the seating groove 125, thereby pressing the filter member 127 such that the filter member 127 is closely attached to the inside of the cylinder 120. That is, if the filter fixing member 200 is seated in the seating groove 125, the cover 210 may contact the filter member 127.

The

seating portions

220 and 230 extend from both ends of the cover 210 and are seated on the inner side surfaces of the seating grooves 125, respectively. The

seating portions

220 and 230 extend from the cover 210 in the same direction, and may have a symmetrical structure.

Specifically, the

placement units

220 and 230 include: a first seating portion 220 extending from one end of the cover portion 210 toward the inside in the radial direction of the cylinder 120; and a second seating portion 230 extending from the other end portion of the cover portion 210 toward the inside in the radial direction of the cylinder 120.

That is, the first seating portion 220 and the second seating portion 230 may be understood to extend from the cover 210 toward the seating groove 125.

The first and second mounting

portions

220 and 230 are closely attached to the inner side surfaces of the mounting groove 125. The first and

second seating portions

220 and 230 are inserted into the seating groove 125, so that the cover 210 presses the filter member 127.

That is, when the first and

second seating portions

220 and 230 are inserted into the seating groove 125, the cover 210 presses the filter member 127 toward the inside of the cylinder 120, and thus, a portion of the filter member 127 may be pressed toward the inside of the seating groove 125. Thereby, the filter member 127 can be firmly supported by the cylinder 120 and can maintain tension.

The filter member 127 may be pressed by the cover 210 in a state of being pressed into the gas inflow passage 123, which is an outer circumferential surface of the cylinder 120. At this time, a portion of the filter member 127 exposed to the inside of the installation groove 125 may be closely attached to the inside of the installation groove 125 by pressing the cover 210.

That is, a portion of the filter member 127 may contact the bottom surface 125a of the seating groove 125. With this configuration, the filter member 127 can be prevented from being detached from the cylinder 120 or idling.

Also, the first seating portion 220 and the second seating portion 230 may have a semicircular shape.

In the present embodiment, the first seating portion 220 and the second seating portion 230 may be formed in a semi-cylindrical shape having a symmetrical structure. That is, the first seating portion 220 extends from the front of the cover 210 to have a semicircular cross section, and the second seating portion 230 extends from the rear of the cover 210 to have a semicircular cross section.

At this time, the first seating portion 220 may include: a first face 220a forming a plane; and a second surface 220b forming a curved surface, the second seating portion 230 may include: a first face 230a forming a plane; and a second face 230b forming a curved surface.

Further, the

first faces

220a, 230a of the first and

second seating portions

220, 230 are disposed in such a manner as to face each other, and the respective

second faces

220b, 230b of the first and

second seating portions

220, 230 may be arcuately projected in opposite directions.

In the present embodiment, the case where the first and

second seating portions

220 and 230 are formed in a semicircular or semi-cylindrical shape has been described, but the present invention is not limited thereto.

For example, the first and

second seating portions

220 and 230 may be formed in a rectangular parallelepiped or polyhedral shape. That is, in various embodiments, the first seating portion 220 and the second seating portion 230 may be formed to extend in a rectangular parallelepiped or polyhedral shape from both end portions of the cover portion 210, respectively. In this case, the seating groove 125 may be formed in a shape corresponding to the shapes of the first and

second seating portions

220 and 230.

Fig. 10 is a perspective view of a filter fixing member according to a second embodiment of the present invention, and fig. 11 is a sectional view showing a state in which the filter fixing member according to the second embodiment of the present invention is disposed in a mounting groove of a cylinder.

This embodiment is characterized in that the other portions are the same as those of the first embodiment, and there is a difference only in the structure of the filter fixing member. Therefore, only the characteristic portions of the present embodiment will be described below, and the same portions as those of the first embodiment will be referred to in the description of the first embodiment.

Referring to fig. 10 and 11, the linear compressor 10 of the second embodiment includes: a cylinder 120; a filter member 127 wound around an outer circumferential surface of the cylinder 120; and a filter fixing member 300 for fixing the filter member 127.

The cylinder 120 and the filter member 127 are the same as those of the first embodiment described above, and thus, detailed description of the cylinder 120 and the filter member 127 will be omitted.

The filter fixing member 300 is seated in a seating groove 125 formed at the cylinder 120, thereby fixing the filter member 127. The filter fixing member 300 is provided with at least one gas inflow path 123 so that the filter member 127 can be fixed.

Specifically, the filter fixing member 300 includes: a cover 310 covering a part of the filter member 127; and

seating portions

320 and 330 formed at both sides of the cover 310 and inserted into the seating groove 125.

The cover 310 is formed to be long in the axial direction, and may be formed in a rod shape, for example. The cover 310 is disposed to cover at least a part of the installation groove 125.

At this time, the cover 310 is disposed in the seating groove 125, so that the filter member 127 can be pressed to closely contact the inside of the cylinder 120 with the filter member 127. That is, if the filter fixing member 300 is seated in the seating groove 125, the cover 310 may contact the filter member 127.

The receiving

portions

320 and 330 extend from both ends of the cover 310 and are inserted into the inner surface of the receiving groove 125.

In particular, the

seating portions

320 and 330 may be formed to be curved outward from both ends of the cover 310. The

placement portions

320 and 330 have a symmetrical structure, and may be formed in a fan shape, for example.

Specifically, the

placement portions

320 and 330 include: a first seating portion 320 formed in an arc shape at one end portion of the cover portion 310; and a second seating portion 330 formed in an arc shape at the other end of the cover portion 310.

The first receiving portion 320 and the second receiving portion 330 are portions that are in close contact with the inner surfaces of the receiving groove 125. The first seating portion 320 and the second seating portion 330 are inserted into both inner side surfaces of the seating groove 125, so that the cover 310 presses the filter member 127.

At this time, the filter member 127 may be pressed by the cover 310 in a state of being inserted into the gas inflow passage 123. Thus, a part of the filter member 127 exposed to the inside of the installation groove 125 is pressed by the lid 310, and is closely attached to the inside of the installation groove 125, so that the tension of the filter member 127 can be maintained.

With this configuration, the filter member 127 can be prevented from being detached from the cylinder 120 or idling.

Fig. 12 is a perspective view of a cylinder according to a third embodiment of the present invention, and fig. 13 is a perspective view of a filter fixing member according to the third embodiment of the present invention.

Referring to fig. 12 and 13, the linear compressor 10 of the third embodiment includes: a cylinder 1200; a filter member 1270 wound around the outer circumferential surface of the cylinder 1200; and a filter fixing member 400 for fixing the filter member 1270.

The cylinder 1200 and the filter member 1270 are very similar to those of the first embodiment described above, and thus, detailed descriptions of the cylinder 1200 and the filter member 1270 are omitted.

The filter fixing member 400 is seated in a seating groove 1250 formed at the cylinder 1200, thereby fixing the filter member 1270. The filter fixing member 400 may be provided with one or more gas inflow passages 1230 formed in the cylinder 1200, and may fix the filter member 1270.

Specifically, the filter fixing member 400 includes: a plate 410 seated in the seating groove 1250; and a pair of

extensions

420, 430 formed at both sides of the plate 410.

At this time, the plate 410 and/or the pair of

extensions

420 and 430 may be formed of a material capable of plastic deformation. For example, the filter fixing member 400 may be integrally formed of a plastic material capable of plastic deformation.

The plate 410 is disposed inside the disposition groove 1250, and may have a quadrangular shape, for example. The plate 410 may have an area corresponding to the bottom surface of the seating groove 1250. Thus, the plate 410 may be disposed to cover the entire bottom surface of the seating groove 1250.

The pair of

extensions

420 and 430 extend from both ends of the plate 410, respectively, and are disposed on the inner surface of the disposition groove 1250.

In particular, the pair of

extensions

420 and 430 may extend from both ends of the plate 410 toward the outside in the radial direction of the cylinder 1200. For example, the pair of

extensions

420 and 430 may extend from both ends of the plate 410 at an angle perpendicular to the plate 410.

Specifically, the pair of

extensions

420, 430 includes: a first extension part 420 formed in a perpendicular manner from one end of the plate 410; and a second extension 430 formed in a perpendicular manner from the other end of the plate 410.

The first extension part 420 and the second extension part 430 are closely attached to the inner side surface of the seating groove 1250. The first extension part 420 and the second extension part 430 can press the filter member 1270 by being plastically deformed after being inserted into the inside of the seating groove 1250.

Hereinafter, a method of attaching a filter fixing member according to a fourth embodiment will be described in detail with reference to the accompanying drawings

Fig. 14A is a sectional view taken along line VI-VI' of fig. 12, fig. 14B is a sectional view showing a state where a filter fixing member is disposed in a disposition groove of the cylinder in fig. 14A, fig. 14C is a sectional view showing a state where a filter member is disposed in a disposition groove in fig. 14B, and fig. 14D is a sectional view showing a state where the filter member in fig. 14C is fixed by the filter fixing member.

First, as shown in fig. 14A and 14B, the filter fixing member 400 is seated in the seating groove 1250 of the cylinder 1200. At this time, the filter fixing member 400 may be pressed into the inner side of the seating groove 1250 and fixed.

If the filter fixing member 400 is seated in the seating groove 1250, the plate 410 of the filter fixing member 400 may cover the entire bottom surface of the seating groove 1250. In addition, the

extension parts

420 and 430 of the filter fixing member 400 may be closely attached to both inner side surfaces of the seating groove 1250, respectively.

Thereafter, as shown in fig. 14C, the filter member 1270 is disposed in the gas inflow passage 1230 formed in the cylinder 1200.

Specifically, the filter member 1270 is wound in the circumferential direction along the gas inflow passage 1230. Thereby, a portion of the filter member 1270 is exposed by the seating groove 1250. In other words, a portion of the filter member 1270 is in a state of being spaced apart from the bottom surface of the seating groove 1250.

At this time, a part of the filter member 1270 is disposed inside the filter fixing member 400. That is, a part of the filter member 1270 may be disposed above the plate 410 or radially outward.

When the installation of the filter member 1270 is finished, the filter member 1270 is pressed by pressing or bending both sides of the filter fixing member 400.

Specifically, the pair of

extension portions

420 and 430 of the filter fixing member 400 are bent toward the inside direction or the direction to approach each other. Thereby, the pair of

extension portions

420 and 430 can be bent in a direction of being closely attached to the filter member 1270 by plastic deformation.

That is, the pair of

extensions

420 and 430 can fix the filter member 1270 by pressing the upper portion of the filter member 1270 positioned inside the filter fixing member 400. Thereby, the filter member 1270 is closely attached to the outer surface of the plate 410, and can be firmly fixed to the cylinder 1200 by being pressed by the pair of

extension portions

420 and 430. According to this structure, the tension of the filter member 1270 can be maintained, and the filter member 1270 can be prevented from being detached from the cylinder 1200 to the outside or idling.

Fig. 15 is a perspective view of a filter fixing member according to a fourth embodiment of the present invention, fig. 16A is a sectional view showing a mounting groove of a cylinder according to the fourth embodiment of the present invention, fig. 16B is a sectional view showing a state in which the filter fixing member is disposed in the mounting groove of fig. 16A, fig. 16C is a sectional view showing a state in which the filter member is disposed in the mounting groove of fig. 16B, and fig. 16D is a sectional view showing a state in which the filter member of fig. 16C is fixed by the filter fixing member.

This embodiment is characterized in that the other portions are the same as the third embodiment, and there is a difference only in the structure of the filter fixing member. Therefore, only the characteristic portions of the present embodiment will be described below, and the description of the third embodiment will be applied to the same portions as those of the third embodiment.

Referring to fig. 15 and 16A to 16D, the linear compressor 10 of the fourth embodiment includes: a cylinder 1200; a filter member 1270 wound around the outer circumferential surface of the cylinder 1200; and a filter fixing member 500 for fixing the filter member 1270.

The cylinder 1200 and the filter member 1270 are the same as those of the third embodiment described above, and thus, detailed description thereof will be omitted.

The filter fixing member 500 is seated in a seating groove 1250 formed at the cylinder 1200, thereby fixing the filter member 1270. The filter fixing member 500 may be provided with at least one gas inflow passage 1230 formed in the cylinder 1200, so that the filter member 1270 may be fixed.

Specifically, the filter fixing member 500 includes: a plate 510 disposed inside the seating groove 1250; and an extension part 520 extending from the plate 510 toward one side.

At this time, the plate 510 and/or the extension 520 may be formed by such a setting capable of plastic deformation. For example, the filter fixing member 500 may be integrally formed of a plastic material capable of plastic deformation.

The plate 510 is seated in the seating groove 1250, and may have a quadrangular shape, as an example. The plate 510 may have an area corresponding to the bottom surface of the seating groove 1250. Thus, the plate 510 may be disposed to cover the entire bottom surface of the seating groove 1250.

The extension part 520 extends upward from the end of the plate 510 and is disposed at the inner side of the seating groove 1250.

In particular, the extension 520 may extend from one end of the plate 510 toward the outer side in the radial direction of the cylinder 1200. For example, the extension part 520 may extend from one end of the plate 510 in a direction perpendicular to the plate 510. At this time, the width of the extension 520 may be formed to be the same as the width of the plate 510.

The extension 520 is a portion closely attached to the inner side surface of the seating groove 1250. The extension part 520 can press the filter member 1270 by performing plastic deformation after being inserted into the inner side of the seating groove 1250.

Hereinafter, a method of attaching a filter fixing member according to a fourth embodiment will be described in detail with reference to the drawings.

First, as shown in fig. 16A and 16B, the filter fixing member 500 is seated in the seating groove 1250 of the cylinder 1200. At this time, the plate 510 of the filter fixing member 500 may be pressed into the inner side of the seating groove 1250 and fixed.

If the filter fixing member 500 is seated in the seating groove 1250, the plate 510 of the filter fixing member 500 may cover the entire bottom surface of the seating groove 1250. In addition, the extension part 520 of the filter fixing member 500 may be closely attached to the inner side surface of the seating groove 1250.

Thereafter, as shown in fig. 16C, the filter member 1270 is provided in the gas inflow passage 1230 formed in the cylinder 1200.

Specifically, the filter member 1270 is wound around along the inner side of the gas inflow passage 1230 in the circumferential direction. Thereby, a portion of the filter member 1270 is exposed by the seating groove 1250. In other words, a portion of the filter member 1270 is in a state of being spaced apart from the bottom surface of the seating groove 1250.

At this time, a part where the filter member 1270 is disposed inside the filter fixing member 500. That is, a part of the filter member 1270 may be disposed above the plate 510 or radially outward.

When the setting of the filter member 1270 is finished, the filter member 1270 is pressed by pressing one side of the filter fixing member 500.

Specifically, the extension part 520 of the filter fixing member 500 is bent toward an inner direction or a direction in which the plate 510 is bent. Thereby, the extension part 520 can be bent in a direction of being closely attached to the filter member 1270 by being plastically deformed.

The extension 520 can fix the filter member 1270 by pressing a portion of the filter member 1270 located inside the filter fixing member 500. Thereby, the filter member 1270 is closely attached to the outer surface of the plate 510, and can be firmly fixed to the cylinder 1200 by being pressed by the extension part 520. This can maintain the tension of the filter member 1270, and prevent the filter member 1270 from being detached from the cylinder 1200 or idling.

According to the linear compressor of the present invention having the above-described structure, the following effects can be obtained.

First, since the filter fixing member for gripping the filter member provided in the cylinder is provided, there is an advantage in that the filter member can be prevented from being detached from the cylinder or idling.

In particular, the filter fixing member may press the filter member from the outside toward the inside of the cylinder, and thus, even if the tension of the wire filter is weakened as the compressor is operated for a long time, the tension of the wire filter is maintained, thereby enabling to maintain the filter performance.

Second, the filter fixing member can be easily attached to the installation groove that is further recessed toward the inside in the radial direction from the gas inflow passage for installing the filter member, and thus, there is an advantage that the filter member can be attached and detached with a simple structure.

Thirdly, since a part of the filter fixing member is seated in the seating groove and the other part of the filter fixing member fixes the filter member by performing plastic deformation, there is an advantage in that the filter fixing member has a high degree of freedom in installation.

Claims

1. A linear compressor, characterized by comprising:

a piston that reciprocates in an axial direction;

a cylinder provided in such a manner as to accommodate the piston;

a gas inflow passage recessed radially inward from an outer peripheral surface of the cylinder;

a placement groove that is further recessed inward in the radial direction from the gas inflow channel;

a filter member disposed in the gas inflow passage; and

a filter fixing member inserted into the seating groove and pressing the filter member toward an inside of the cylinder.

2. Linear compressor according to claim 1,

the filter fixing member presses the filter member such that a portion of the filter member is closely attached to the bottom surface of the seating groove.

3. Linear compressor according to claim 1,

the gas inflow flow path extends in a circumferential direction of the cylinder,

the filter member is provided so as to be wound in a circumferential direction along the gas inflow passage.

4. Linear compressor according to claim 3,

the seating groove is further recessed in the axial direction from the gas inflow passage.

5. Linear compressor according to claim 4,

the filter fixing member includes:

a cover part accommodated in the seating groove and covering a portion of the filter member;

a first seating portion extending from the cover portion and seated inside the seating groove; and

a second seating portion extending from the cover portion and seated inside the seating groove.

6. Linear compressor according to claim 5,

the first seating portion extends from one end portion of the cover portion toward an inner side of the seating groove,

the second mounting portion extends from the other end portion of the cover portion toward the inside of the mounting groove.

7. Linear compressor according to claim 5,

a portion of the filter member is disposed between the first and second seating portions.

8. Linear compressor according to claim 6,

the first and second placing portions respectively include a first surface forming a plane and a second surface forming a curved surface,

the first faces are arranged to face each other, and the second faces are arcuately convex in opposite directions.

9. Linear compressor according to claim 1,

the filter member includes a filament formed of a PET material.

10. Linear compressor according to claim 1,

the filter fixing member is formed of an engineering plastic material.

11. Linear compressor according to claim 4,

the filter fixing member includes:

a cover part accommodated in the seating groove and covering a portion of the filter member; and

and a seating part formed by both side ends of the cover part being respectively arc-shaped, the seating part being inserted into both sides of the seating groove.

12. Linear compressor according to claim 4,

the filter fixing member includes:

a plate disposed inside the seating groove; and

an extension extending upward from the plate, the extension covering a portion of the filter member by plastic deformation.

13. Linear compressor according to claim 12,

the board is closely attached to the bottom surface of the placing groove,

the extension part is tightly attached to the inner side surface of the placement groove.

14. Linear compressor according to claim 12,

the extension is formed to have the same width as that of the plate.

15. Linear compressor according to claim 12,

the extension includes:

a first extension extending upward from one end of the plate; and

a second extending portion extending upward from the other end portion of the plate,

the first extension portion and the second extension portion are closely attached to the filter member by being plastically deformed in a direction in which they approach each other.