KR20160011009A - Linear compressor - Google Patents

Abstract

The present invention relates to a linear compressor. According to an aspect, the linear compressor comprises: a shell wherein a suction unit is provided; a cylinder provided inside the shell to form a compression space for refrigerant; a frame coupled to an external side of the cylinder; a piston provided to be reciprocated in an axial direction within the cylinder; a stator cover coupled to the frame; and a linear motor arranged between the frame and the stator cover to provide power to the piston. The stator cover comprises: a body; and at least one frame coupling unit extending toward the frame in the body, and coupled to the frame.

Description

[0001] Linear compressor [0002]

The present specification relates to a linear compressor.

The cooling system is a system that generates cool air by circulating a coolant, and repeats the process of compressing, condensing, expanding, and evaporating the coolant. To this end, the cooling system includes a compressor, a condenser, an expansion device and an evaporator. The cooling system may be installed in a refrigerator or an air conditioner as a household appliance.

Generally, a compressor is a mechanical device that receives power from a power generating device such as an electric motor or a turbine to increase pressure by compressing air, refrigerant or various other operating gases. .

Such a compressor is broadly classified into a reciprocating compressor that compresses the refrigerant while linearly reciprocating the piston inside the cylinder so as to form a compression space in which a working gas is sucked and discharged between the piston and the cylinder. A rotary compressor for compressing the refrigerant while the roller is eccentrically rotated along the inner wall of the cylinder and a compression space for sucking and discharging the working gas between the roller and the cylinder, a scroll compressor in which a compression space in which an operating gas is sucked and discharged is formed between a fixed scroll and a fixed scroll and the orbiting scroll rotates along the fixed scroll to compress the refrigerant.

In recent years, among the reciprocating compressors, there has been developed a linear compressor in which a piston is directly connected to a driving motor that reciprocates linearly, so that compression efficiency can be improved without mechanical loss due to motion switching and a simple structure is constructed.

Normally, the linear compressor is configured to suck and compress the refrigerant while discharging the refrigerant while moving the piston in the sealed shell by reciprocating linear motion within the cylinder by the linear motor.

The linear motor is configured such that a permanent magnet is positioned between an inner stator and an outer stator, and the permanent magnet is driven to linearly reciprocate by the mutual electromagnetic force between the permanent magnet and the inner (or outer) stator. As the permanent magnet is driven in the state of being connected to the piston, the piston linearly reciprocates in the cylinder, sucks the refrigerant, compresses the refrigerant, and discharges the refrigerant.

A linear compressor is disclosed in Korean Patent Laid-Open Publication No. 10-2006-0119296 (published on November 24, 2006).

The linear compressor of the prior art includes a cylinder block, a linear motor disposed on one side of the cylinder block, and a core cover fastened to the cylinder block by bolts via the linear motor. The core cover may be supported with a spring whose natural frequency is adjusted so that the piston can resonate.

However, according to the conventional linear compressor, since the bolt passes through the core cover from the core cover side toward the cylinder block and the nut is fastened to the bolt from the core cover side, there is a problem that the core cover deforms in the process of fastening the nut to the bolt Lt; / RTI >

When the core cover is deformed as described above, there is a problem that the core cover is interfered with other structures by the deformation of the core cover, or the spring can not be accurately supported on the core cover.

An object of the present invention is to provide a linear compressor in which deformation of a stator cover is prevented in a process of fastening a stator cover and a frame.

A linear compressor according to one aspect includes: a shell provided with a suction portion; A cylinder disposed inside the shell and forming a compression space for the refrigerant; A frame coupled to the outside of the cylinder; A piston reciprocating axially inside the cylinder; A stator cover coupled to the frame; And a linear motor disposed between the frame and the stator cover for providing power to the piston, the stator cover comprising: a body; and at least one stator core extending from the body toward the frame, Frame combining unit.

The linear motor includes a bobbin to which the coil is wound, and a plurality of stator core block units surrounding the bobbin and circumferentially spaced apart from each other. The at least one frame coupling unit is disposed in a space between adjacent two stator core block units Lt; / RTI >

The stator cover may include a plurality of frame engaging portions spaced apart from each other in the circumferential direction of the body.

Further, at least two stator core block units may be positioned between adjacent two frame engaging portions.

Further, the frame may include a fastening hole for fastening the fastening member, and the frame fastening part may include a fastening groove for fastening the fastening member.

Further, the fastening member may be fastened to the fastening hole and the fastening groove from the frame side toward the frame fastening portion.

The stator cover may further include a back cover coupling portion extending from the body in a direction opposite to the frame coupling portion and coupled with the back cover.

The stator cover may include a plurality of back cover fastening portions spaced apart from each other in the circumferential direction of the body.

The back cover may include a fastening flange for fastening to the back cover engagement portion.

In addition, the fastening flange may include a fastening hole for fastening the fastening member, and the back cover fastening portion may include a fastening groove for fastening the fastening member.

Further, the fastening member may be fastened to the fastening hole and the fastening groove from the fastening flange side toward the back cover fastening portion.

The back cover engaging portion may be formed with a plurality of guide grooves for inserting guide pins for aligning the fastening holes and the fastening holes when assembling the back cover and the stator cover.

In addition, the fastening groove may be positioned between the plurality of guide grooves.

The stator cover may further include a reinforcing rib that connects the body and the back cover fastening portion.

The stator of claim 1, further comprising a plurality of springs disposed between the stator cover and the back cover to allow the piston to resonate, and the body includes a spring coupling protrusion coupled to at least one of the plurality of springs. .

According to the proposed invention, as the fastening member penetrating the frame is fastened to the frame engaging portion extending from the body of the stator cover, the fastening force of the fastening member is absorbed by the frame engaging portion.

Therefore, even if the frame engaging portion is deformed during the fastening operation of the fastening member, the frame engaging portion absorbs the fastening force, so that the body can be prevented from being deformed.

As the deformation of the body is prevented, the body can be prevented from interfering with the peripheral structure, and the spring for the piston resonance movement can be supported by the body at a predetermined position.

Further, since two or more stator core block units are positioned between adjacent two frame engaging portions, the stator cover can be coupled to the frame by a small number of frame engaging portions, the structure of the stator cover is simplified, The number of fastening members to be fastened to the fastening member is reduced, and the number of fastening members is reduced.

1 is a sectional view showing a configuration of a linear compressor according to an embodiment of the present invention;
2 is a perspective view illustrating a cylinder and a frame according to an embodiment of the present invention;
3 is a view showing a state where a stator cover is coupled to a frame according to an embodiment of the present invention.
4 is a view showing a state in which a back cover according to an embodiment of the present invention is coupled to a stator cover.
5 is a perspective view of a first stator of a linear motor according to an embodiment of the present invention;
6 is a perspective view of a stator cover according to an embodiment of the present invention;
7 is a view showing an arrangement of a frame coupling portion of a stator cover according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

1 is a cross-sectional view illustrating a configuration of a linear compressor according to an embodiment of the present invention.

Referring to FIG. 1, a linear compressor 100 according to an embodiment of the present invention includes a substantially cylindrical shell 101, a first cover 102 coupled to one side of the shell 101, And a second cover 103 coupled thereto.

The first cover 102 is disposed on the right side of the shell 101 and the second cover 103 is disposed on the right side of the shell 101. [ And may be located on the left side of the shell 101.

In a broad sense, the first cover 102 and the second cover 103 can be understood as a constitution of the shell 101. [

The linear compressor 100 includes a cylinder 120 provided in the shell 101, a piston 130 linearly reciprocating in the cylinder 120, and a driving force The linear motor 200 may further include a linear motor.

When the linear motor 200 is driven, the piston 130 can reciprocate at a high speed. The operating frequency of the linear compressor 100 according to the present embodiment is approximately 100 Hz.

In more detail, the linear compressor 100 may further include a suction unit 104 through which the refrigerant flows and a discharge unit 105 through which the refrigerant compressed in the cylinder 120 is discharged.

The suction unit 104 may be coupled to the first cover 102 and the discharge unit 105 may be coupled to the second cover 103.

The refrigerant sucked through the suction portion 104 flows into the piston 130 through the suction muffler 150. In the course of the refrigerant passing through the suction muffler 150, the noise can be reduced. The suction muffler 150 may include a first muffler 151 and a second muffler 153 coupled to the first muffler 151. At least a portion of the suction muffler 150 may be located within the piston 130.

The piston 130 may include a substantially cylindrical piston body 131 and a piston flange portion 132 extending radially from the piston body 131.

The piston body 131 reciprocates within the cylinder 120 and the piston flange 132 can reciprocate outside the cylinder 120.

The piston 130 may be made of an aluminum material (aluminum or aluminum alloy) which is a non-magnetic material. Since the piston 130 is made of an aluminum material, the magnetic flux generated in the linear motor 200 can be prevented from being transmitted to the piston 130 and leaking to the outside of the piston 130. The piston 130 may be formed by a forging method, although not limited thereto.

Meanwhile, the cylinder 120 may be made of an aluminum material (aluminum or aluminum alloy) which is a nonmagnetic material. The material composition ratio of the cylinder 120 and the piston 130, that is, kind and composition ratio, may be the same.

Since the cylinder 120 is made of an aluminum material, it is possible to prevent a magnetic flux generated in the linear motor 200 from being transmitted to the cylinder 120 and leaking to the outside of the cylinder 120. The cylinder 120 may be formed by an extrusion rod processing method, although not limited thereto.

The piston 130 and the cylinder 120 are made of the same material (aluminum), so that the coefficients of thermal expansion are equal to each other. During the operation of the linear compressor 100, a high temperature (about 100 ° C) environment is created inside the shell 100. Since the thermal expansion coefficient of the piston 130 is the same as that of the cylinder 120, And the cylinder 120 can be thermally deformed by the same amount.

As a result, since the piston 130 and the cylinder 120 are thermally deformed in different sizes or directions, interference between the piston 130 and the cylinder 120 can be prevented.

The cylinder 120 may receive at least a portion of the suction muffler 150 and at least a portion of the piston 130.

In the cylinder 120, a compression space P in which the refrigerant is compressed by the piston 130 may be formed. A suction hole 133 for introducing a refrigerant into the compression space P is formed in a front portion of the piston 130. The suction hole 133 is selectively provided in front of the suction hole 133, A suction valve 135 is provided. A coupling hole through which a predetermined fastening member is coupled may be formed at a substantially central portion of the suction valve 135.

A discharge cover 160 for forming a discharge space or a discharge path for the refrigerant discharged from the compression space P and a discharge cover 160 coupled to the discharge cover 160 and disposed in front of the compression space P, A discharge valve assembly 161, 162, 163 for selectively discharging compressed refrigerant may be provided.

The discharge valve assemblies 161, 162, and 163 are opened when the pressure in the compression space P is equal to or higher than the discharge pressure, and the refrigerant is discharged to the discharge space of the discharge cover 160, A valve spring 162 provided between the discharge valve 161 and the discharge cover 160 for applying an elastic force in the axial direction and a stopper 163 for limiting the amount of deformation of the valve spring 162 .

Here, the compression space P is a space formed between the suction valve 135 and the discharge valve 161. The suction valve 135 is disposed on one side of the compression space P and the discharge valve 161 can be disposed on the other side of the compression space P, have. The discharge valve 161 may be movably disposed at a front end of the cylinder 120.

The "axial direction" may be understood as a direction in which the piston 130 reciprocates or a direction in which the "permanent magnet" reciprocates.

In the "axial direction", the direction from the suction portion 104 toward the discharge portion 105, that is, the direction in which the refrigerant flows is referred to as "forward" and the opposite direction is defined as "rearward".

On the other hand, "radial direction" can be understood as a direction perpendicular to the direction in which the piston 130 reciprocates.

The stopper 163 may be seated in the discharge cover 160 and the valve spring 162 may be seated in the rear of the stopper 163. The discharge valve 161 is coupled to the valve spring 162 and the rear or rear surface of the discharge valve 161 is positioned to be supported on the front surface of the cylinder 120.

The valve spring 162 may include a plate spring, for example.

When the pressure in the compression space P is lower than the discharge pressure and the suction pressure is lower than the suction pressure in the reciprocating linear motion of the piston 130 in the cylinder 120, the suction valve 135 is opened, Is sucked into the compression space (P). On the other hand, when the pressure in the compression space P becomes equal to or higher than the suction pressure, the refrigerant in the compression space P is compressed while the suction valve 135 is closed.

On the other hand, when the pressure in the compression space P becomes equal to or higher than the discharge pressure, the valve spring 162 is deformed to open the discharge valve 161. The refrigerant is discharged from the compression space P, And is discharged into the discharge space of the cover 160.

The refrigerant flowing in the discharge space of the discharge cover 160 flows into the loop pipe 165. The loop pipe 165 is coupled to the discharge cover 160 and extends to the discharge part 105 to guide the compressed refrigerant in the discharge space to the discharge part 105. For example, the loop pipe 178 may have a round shape extending in a predetermined direction and may be coupled to the discharge unit 105.

The linear compressor 100 may further include a frame 110 coupled to the outside of the cylinder 120. The frame 110 is configured to fix the cylinder 120 and can be fastened to the cylinder 120 by a separate fastening member. The frame 110 is disposed to surround the cylinder 120. That is, the cylinder 120 can be received inside the frame 110. The discharge cover 160 may be coupled to the front surface of the frame 110.

On the other hand, at least a portion of the gaseous refrigerant in the high-pressure gas refrigerant discharged through the opened discharge valve 161 flows through the space of the portion where the cylinder 120 and the frame 110 are coupled to the outer peripheral surface side of the cylinder 120 Can flow.

The refrigerant flows into the cylinder 120 through the inlet 123 formed in the cylinder 120. The introduced refrigerant may flow into the space between the piston 130 and the cylinder 120 so that the outer circumferential surface of the piston 130 is spaced from the inner circumferential surface of the cylinder 120. Accordingly, the introduced refrigerant can function as a "gas bearing " which reduces friction with the cylinder 120 during reciprocation of the piston 130. [

The linear motor 200 includes a first stator 210 disposed to surround the cylinder 120, a second stator 250 disposed apart from the first stator 210, And a permanent magnet 260 positioned in a space between the first stator 210 and the second stator 250.

In this specification, either one of the first stator 210 and the second stator 250 may be an outer stator and the other may be an inner stator.

In FIG. 1, for example, the first stator 210 is an outer stator and the second stator 250 is an inner stator.

The permanent magnets 260 can reciprocate linearly by mutual electromagnetic forces between the first stator 210 and the second stator 250. The permanent magnet 260 may be composed of a single magnet having one pole or a magnet having three poles. A plurality of permanent magnets 260 may be provided on the outer side of the second stator 250.

The permanent magnet (260) may be coupled to the piston (130) by a connecting member (138). In detail, the connecting member 138 may be coupled to the piston flange portion 132 and may be bent and extended toward the permanent magnet 260. As the permanent magnet 260 reciprocates, the piston 130 can reciprocate axially together with the permanent magnet 260 by the connecting member 138.

The linear motor 200 may further include a fixing member 262 for fixing the permanent magnet 260 to the connecting member 138. The fixing member 262 may be composed of a glass fiber or a mixture of carbon fiber and resin. The fixing member 262 is provided so as to surround the inside and the outside of the permanent magnet 260 so that the permanent magnet 260 and the connecting member 138 can be firmly engaged with each other.

The first stator 210 may include coil winding bodies 240 and 242 and a plurality of stator core block units installed at predetermined intervals in the circumferential direction of the coil winding bodies 240 and 242.

Each of the plurality of stator core block units may include a plurality of core blocks. Each of the plurality of core blocks may include a plurality of laminations laminated in a circumferential direction, and may be disposed to surround the coil windings 240 and 242.

The coil windings 240 and 242 may include a bobbin 240 and a coil 242 wound around the bobbin 240 in the circumferential direction. The cross section of the coil 242 may have a polygonal shape, for example, a hexagonal shape.

The linear compressor 100 includes a supporter 300 supporting the piston 130 and a back cover 280 spaced apart from one side of the supporter 300 and coupled to the supporter 300 .

The supporter 300 may be coupled to the piston flange portion 132 and the connecting member 138 by a predetermined fastening member.

A suction guide portion 155 is coupled to the front of the back cover 280. The suction guide part 155 guides the refrigerant sucked through the suction part 104 into the suction muffler 150.

The linear compressor 100 may further include a plurality of springs 330 and 332 whose natural frequencies are adjusted so that the piston 130 can resonate.

The plurality of springs 330 and 332 may include a first spring 330 supported between the supporter 300 and the stator cover 270 and a second spring 330 supported between the supporter 300 and the back cover 280 And may include a second spring 332.

The linear compressor 100 may further include leaf springs 172 and 174 provided on both sides of the shell 101 to allow the internal parts of the compressor 100 to be supported by the shell 101.

The leaf springs 172 and 174 may include a first leaf spring 172 coupled to the first cover 102 and a second leaf spring 174 coupled to the second cover 103 . The first leaf spring 172 can be fitted to a portion where the shell 101 and the first cover 102 are coupled and the second leaf spring 174 can be engaged with the shell 101, 2 cover 103 is engaged.

2 is a perspective view showing a cylinder and a frame according to an embodiment of the present invention.

Referring to FIG. 2, the cylinder 120 may include a substantially cylindrical cylinder body 121 and a cylinder flange portion 125 extending in the radial direction from the cylinder body 121.

The cylinder body 121 may include an inlet 123 through which gas refrigerant flows. The inlet 123 may be recessed into a substantially circular shape along the outer circumferential surface of the cylinder body 121.

In addition, a plurality of the inflow portions 123 may be provided. The plurality of inflow portions 123 may be disposed axially spaced apart from the outer circumferential surface of the cylinder body 121.

The cylinder flange portion 125 may be provided with a coupling portion 126 to be coupled with the frame 110. The coupling portion 126 may protrude outward from the outer circumferential surface of the cylinder flange portion 125. The coupling portion 126 may be coupled to the cylinder coupling groove 118 of the frame 110 by a predetermined coupling member.

The cylinder flange 125 may include a seating surface 127 that is seated in the frame 110. The seating surface 127 may be a surface of the cylinder flange 125 extending in the radial direction from the cylinder body 121.

The frame 110 includes a frame body 111 surrounding the cylinder body 121 and a cover coupling part 114 extending in the radial direction of the frame body 111 and coupled to the discharge cover 160. [ . ≪ / RTI >

A plurality of discharge cover fastening holes 116 into which the fastening members to be coupled to the discharge cover 160 are inserted and a plurality of fastening members to be fastened to the cylinder flange portions 125 are inserted into the cover engaging portion 114, A cylinder coupling groove 118 may be formed.

A plurality of stator cover fastening holes 115 may be formed in the cover engaging portion 114 for fastening the stator cover 270 with fastening members. At this time, the plurality of stator cover fastening holes 115 and the plurality of discharge cover fastening holes 116 may be alternately arranged.

The frame 110 is provided with an insertion portion 117 which is recessed rearward from the cover engagement portion 114 and into which the cylinder flange portion 125 is inserted. That is, the insertion portion 117 may be disposed so as to surround the outer circumferential surface of the cylinder flange portion 125. The recessed depth of the insertion portion 117 may correspond to the front and rear widths of the cylinder flange portion 125.

A predetermined refrigerant flow space may be formed between the inner circumferential surface of the insertion portion 117 and the outer circumferential surface of the cylinder flange portion 125. The high-pressure gas refrigerant discharged from the discharge valve 161 can flow toward the outer circumferential surface of the cylinder body 121 via the refrigerant flow space.

The insertion portion 117 may include a supporting surface 119 facing the seating surface 127 of the cylinder flange portion 125. The seat surface 127 of the cylinder flange portion 125 is directly seated on the support surface 119 of the insertion portion 117 or the filter flange portion 125 is fitted to the filter surface, The seat surface 127 of the seat 125 can be seated.

The linear compressor 100 is provided between an outer circumferential surface of the cylinder body 121 and an inner circumferential surface of the frame body 111 and is provided with a sealing member 128 for sealing a space between the cylinder 120 and the frame 110 ). The sealing member 128 may have a ring shape.

FIG. 3 is a view showing a state where a stator cover is coupled to a frame according to an embodiment of the present invention, FIG. 4 is a view showing a state where a back cover according to an embodiment of the present invention is coupled to a stator cover, 5 is a perspective view of a first stator of a linear motor according to an embodiment of the present invention, FIG. 6 is a perspective view of a stator cover according to an embodiment of the present invention, and FIG. 7 is a perspective view of a stator cover according to an embodiment of the present invention. FIG. 7 is a view showing the arrangement of frame combining portions of FIG.

3 to 7, a first stator 210 of the linear motor 200 includes a bobbin 240 having a coil 242 wound in a circumferential direction and a bobbin 240 wound around the bobbin 240 in a circumferential direction And may include a plurality of stator core block units 211. A space 243 may be formed between adjacent two stator core block units 211.

The stator cover 270 includes a body 271 having an opening 272 through which the piston 130 can pass and at least one frame engaging portion 272 extending from the body 271 toward the frame 110. [ (274).

The at least one frame engaging portion 274 may extend from the first surface 271a of the body 271. [ The first spring 330 may be supported on a second surface 271b of the body 271, which faces the first surface 271a.

A plurality of frame engaging portions 274 may extend from the body 271 to secure the stator cover 270 and the frame 110 tightly.

The plurality of frame coupling portions 274 may be spaced apart from each other in the circumferential direction of the body 271.

One frame engaging portion 274 may be located in the space 243 between adjacent two stator core block units 211. [ The size of the stator cover 270 in the radial direction can be prevented from increasing as one frame engaging portion 274 is positioned in the space 243 between adjacent two stator core block units 211. [

As shown in FIG. 3, at least two stator core block units 211 may be positioned between adjacent two frame engaging portions 274.

Each of the frame engaging portions 274 may include a fastening groove 275 for fastening the fastening member S thereto.

When the respective frame engaging portions 274 are positioned in the space 243 between the two stator core block units 211, the engaging grooves 275 can be aligned with the stator cover engaging holes 115 of the frame 110 have.

The fastening member S may be fastened to the stator cover fastening hole 115 and the fastening groove 275 from the frame 110 toward the frame fastening part 274. [

According to the present embodiment, as the fastening member S passing through the frame 110 is fastened to the frame engaging portion 274 extending from the body 271 of the stator cover 270, So that the fastening force of the fastening member S is absorbed.

Therefore, even if the frame engaging portion 274 is deformed during the fastening of the fastening member S, the frame engaging portion 274 absorbs the fastening force, so that the body 271 can be prevented from being deformed.

It is possible to prevent the body 271 from being interfered with the peripheral structure by preventing the body 271 from being deformed and to prevent the first spring 330 for the piston resonance movement from supporting the body 271 .

Since two or more stator core block units 211 are positioned between adjacent two frame engaging portions 274, the stator cover 270 is fixed to the frame 110 by a small number of frame engaging portions 274. [ Can be combined. Therefore, the structure of the stator cover 270 is simplified, the number of fastening members to be fastened to the stator cover is reduced, and the number of times to fasten the fastening members is reduced.

The stator cover 270 may further include one or more back cover engaging portions 276 extending from the second surface 271b of the body 271 in a direction opposite to the extending direction of the frame engaging portion 274 have. That is, the at least one back cover coupling portion 276 may extend toward the back cover 280.

A plurality of back cover engaging portions 276 may extend from the body 271 to securely fasten the stator cover 270 and the back cover 280.

The plurality of back cover engaging portions 276 may be spaced apart from each other in the circumferential direction of the body 271.

Each of the plurality of back cover coupling portions 276 may have a coupling groove 277 for coupling the coupling member 285.

The coupling groove 275 of each of the frame coupling portions 274 and the coupling grooves 277 of the respective back cover coupling portions 276 may be disposed so as not to overlap with each other in the axial direction.

The back cover 280 may include one or more fastening flanges 282 for fastening with the one or more back cover engagement portions 276. The one or more fastening flanges 282 may be provided in the same number as the one or more back cover engaging portions 276.

In FIG. 4, it is disclosed, for example, that the back cover 280 includes a plurality of fastening flanges 282.

Each of the plurality of fastening flanges 282 may include a fastening hole 283 for fastening the fastening member 285.

The fastening member 285 is fastened to the fastening hole 283 of the fastening flange 282 and the fastening groove 284 of the back cover engaging portion 276 toward the back cover engaging portion 276 side from the fastening flange 282 side. (Not shown).

The back cover engaging portion 276 is engaged with the engaging member 285 as the engaging member 285 for engaging with the back cover 280 is fastened to the back cover engaging portion 276. According to this embodiment, As shown in FIG.

Therefore, even if the back cover engaging portion 276 is deformed during the fastening of the fastening member 285, the back cover engaging portion 276 absorbs the fastening force, so that the body 271 can be prevented from being deformed have.

As the deformation of the body 271 is prevented, the first spring 330 can be supported by the body 271 at a predetermined position.

The stator cover 270 may further include a reinforcing rib 279 connecting the body 271 and the back cover coupling portion 276. That is, the reinforcing rib 279 may be formed on the second surface 271b of the body 271.

The reinforcing rib 279 is formed so that the back cover engaging portion 276 is engaged with the engaging flange 282 and the back cover engaging portion 276, It can be prevented from being deformed radially outwardly.

Each of the plurality of fastening flanges 282 is provided with guide pins (not shown) for aligning the fastening holes 283 and the fastening holes 277 when the back cover 280 and the stator cover 270 are assembled A plurality of guide holes 284 may be formed.

In addition, a plurality of guide grooves 278 for inserting the guide pins may be formed in the back cover engaging portion 282.

At this time, the coupling grooves 277 may be disposed between the plurality of guide grooves 278, and the coupling holes 283 may be disposed between the plurality of guide holes 284. FIG.

The back cover 280 may further include a spring support portion 281 for supporting the second spring 332. For example, the back cover 280 may include a plurality of spring supports 281.

The plurality of spring supports 281 and the plurality of fastening flanges 282 may be arranged alternately.

A plurality of spring coupling protrusions 273 may be formed on the second surface 271b of the body 271 of the stator cover 270 to be engaged with the first springs 330. [

A plurality of first springs 273 can be seated on the second surface 271b of the body 271. [ When the plurality of first springs 273 are seated on the second surface 271b of the body 271, the respective spring engagement protrusions 273 are fitted into the respective first springs 330.

Therefore, the end of the first spring 330, which contacts the body 271, can be prevented from sliding on the body 271 by the spring coupling protrusion 273.

The plurality of first springs 330 may be spaced apart from each other in the circumferential direction of the body 271.

4, the supporters 300 may be seated on the upper side of the plurality of first springs 330.

A plurality of second springs 332 may be seated on the supporter 300. And the plurality of second springs 332 may be spaced apart from each other in the circumferential direction of the body 271.

At this time, each of the plurality of second springs 332 may be arranged in a line in the axial direction with each of the plurality of first springs 330.

The spring support portion 281 of the back cover 280 may be seated on the upper side of the plurality of second springs 332. At this time, one spring supporting portion 281 can be seated on two or more second springs 332 at the same time.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: Linear compressor 110: Frame
120: cylinder 130: piston
200: Linear motor 270: Stator cover
280: back cover

Claims (15)

A shell provided with a suction portion;
A cylinder disposed inside the shell and forming a compression space for the refrigerant;
A frame coupled to the outside of the cylinder;
A piston reciprocating axially inside the cylinder;
A stator cover coupled to the frame;
And a linear motor disposed between the frame and the stator cover for providing power to the piston,
The stator cover includes a body,
And one or more frame engaging portions extending from the body toward the frame and coupled to the frame. The method according to claim 1,
The linear motor includes a bobbin to which a coil is wound,
A plurality of stator core block units surrounding the bobbin and circumferentially spaced apart from each other,
Wherein the at least one frame engaging portion is located in a space between adjacent two stator core block units. 3. The method of claim 2,
Wherein the stator cover includes a plurality of frame engaging portions spaced apart in the circumferential direction of the body. The method of claim 3,
And at least two stator core block units are positioned between adjacent two frame engaging portions. The method according to claim 1,
Wherein the frame includes a fastening hole for fastening the fastening member,
And the frame engaging portion includes a fastening groove for fastening the fastening member. 6. The method of claim 5,
And the fastening member is fastened to the fastening hole and the fastening groove from the frame side toward the frame fastening portion. The method according to claim 1,
And a back cover coupled to the stator cover,
Wherein the stator cover further includes a back cover engagement portion extending in a direction opposite to the frame engagement portion in the body and engaged with the back cover. 8. The method of claim 7,
Wherein the stator cover includes a plurality of back cover engaging portions spaced apart in the circumferential direction of the body. 8. The method of claim 7,
Wherein the back cover includes a fastening flange for fastening to the back cover engagement portion. 10. The method of claim 9,
Wherein the fastening flange includes a fastening hole for fastening the fastening member,
Wherein the back cover coupling portion includes a coupling groove for coupling the coupling member. 11. The method of claim 10,
And the fastening member is fastened to the fastening hole and the fastening groove from the fastening flange side toward the back cover fastening portion. 11. The method of claim 10,
Wherein a plurality of guide grooves for inserting guide pins for aligning the fastening holes and the fastening holes are formed in the back cover engaging portion when the back cover and the stator cover are assembled. 13. The method of claim 12,
And the fastening groove is located between the plurality of guide grooves. 8. The method of claim 7,
Wherein the stator cover further comprises a reinforcing rib that connects the body and the back cover engagement portion. 8. The method of claim 7,
Further comprising a plurality of springs disposed between the stator cover and the back cover for allowing the piston to resonate,
Wherein the body further comprises a spring engaging projection coupled to at least one of the plurality of springs.

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