KR20160024217A - Linear compressor - Google Patents

Linear compressor Download PDF

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Publication number
KR20160024217A
KR20160024217A KR1020140110775A KR20140110775A KR20160024217A KR 20160024217 A KR20160024217 A KR 20160024217A KR 1020140110775 A KR1020140110775 A KR 1020140110775A KR 20140110775 A KR20140110775 A KR 20140110775A KR 20160024217 A KR20160024217 A KR 20160024217A
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KR
South Korea
Prior art keywords
spring
portion
plurality
piston
cylinder
Prior art date
Application number
KR1020140110775A
Other languages
Korean (ko)
Inventor
김정해
기성현
최기철
Original Assignee
엘지전자 주식회사
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Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020140110775A priority Critical patent/KR20160024217A/en
Publication of KR20160024217A publication Critical patent/KR20160024217A/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F04B35/045Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric using solenoids
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/122Cylinder block
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K33/00Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/02Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K41/00Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02Linear motors; Sectional motors

Abstract

The present invention relates to a linear compressor.
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 linear motor for providing power to the piston; A stator cover for supporting the linear motor together with the frame; A spring unit for allowing the piston to resonate; And a back cover for supporting the spring unit, wherein the spring unit includes: a supporter connected to the piston, the spring having a spring support portion; a first spring supported on the first surface of the stator cover and the spring support portion; A second surface of the spring support, and a second spring supported by the back cover.

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.

A second main spring is supported on the core cover to allow the piston to resonate. One side of the second main spring is supported by a spring support. One side of the first main spring is supported on the other side of the spring support. The other side of the first main spring is supported by the back cover.

The first and second main springs are supported by a spring support, a back cover, and a core cover. When the spring support, the back cover, and the core cover are fastened to the peripheral structure, The spring support, the back cover or the core cover may interfere with the peripheral structure, and since the first main spring or the second main spring can not be supported in a fixed position, The resonance motion is not properly performed, which causes noise during the piston motion.

It is an object of the present invention to provide a linear compressor in which deformation of a supporter for supporting a spring is prevented.

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 linear motor for providing power to the piston; A stator cover for supporting the linear motor together with the frame; A spring unit for allowing the piston to resonate; And a back cover for supporting the spring unit, wherein the spring unit includes: a supporter connected to the piston and having a spring support portion; a first spring supported on the first surface of the stator cover and the spring support portion; A second surface of the spring support, and a second spring supported by the back cover.

In addition, the first spring and the second spring may be arranged in line in the axial direction.

The first spring includes a first end seated on a first surface of the spring support portion and the second spring includes a second end seated on a second surface of the spring support portion, And the second end may be parallel to the axial direction.

In addition, the first end and the second end may be located on the opposite sides with respect to the line.

In addition, the supporter may include a body connectable to the piston, and a plurality of spring supports may extend from the body.

The plurality of spring supporting portions may be connected by a connecting portion.

The body may include an engaging portion formed with an opening and a circumferential portion extending from the engaging portion, and the plurality of spring supporting portions may extend in a direction intersecting the axial direction at an end of the circumferential portion.

In addition, at least one forming portion for strength reinforcement may be formed at a connection portion between the plurality of spring supporting portions and the peripheral portion.

Also, at the circumferential portion, one or more air flow holes for air flow may be formed.

In addition, each of the spring supporting portions may include a first engaging projection and a second engaging projection to which the first spring and the second spring are engaged.

The width of each of the spring support portions adjacent to the body may be greater than the width of the engagement projection side of each of the spring support portions.

In addition, the back cover may include a spring support portion for supporting the second spring, and the spring support portion of the supporter and the spring support portion of the back cover may overlap in the axial direction.

Further, the stator cover includes a plurality of back cover fastening portions to be fastened to the back cover, and a spring support portion of the supporter can be positioned between adjacent two back cover fastening portions.

The axial length of the first spring and the axial length of the second spring may be the same.

According to another aspect, a linear compressor 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 linear motor for providing power to the piston; A stator cover for supporting the linear motor together with the frame; A plurality of first springs seated on the stator cover; A supporter supporting the plurality of first springs and connected to the piston; A plurality of second springs seated on the supporter; And a back cover for supporting the plurality of second springs, wherein the plurality of first springs and the plurality of second springs are seated on the supporter, and each of the plurality of first springs and the plurality of second Each of the springs may be arranged in a line.

According to the present invention, since the first spring is supported on one side of the spring support portion of the supporter, the second spring is supported on the other side, and the first spring and the second spring are arranged in a row, have.

In addition, since the plurality of spring supporting portions are connected by the connecting portion, it is possible to prevent one or more of the plurality of spring supporting portions from being deformed by the elastic force of the spring supported by the plurality of spring supporting portions.

The first end of the first spring and the second end of the second spring are located opposite to each other with respect to a line connecting the respective ends, and a line connecting the first end and the second end The first spring and the second spring on both sides of the supporter act as one spring in parallel with the center connecting line L so that the resonance of the piston can be smoothly performed.

Further, there is an advantage that the side forces of the respective springs can be canceled as the respective springs are aligned.

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 is coupled to a stator cover according to an embodiment of the present invention.
5 is a view showing a state where a spring unit and a connection member are combined according to an embodiment of the present invention.
6 is a perspective view of a supporter according to an embodiment of the present invention;
Fig. 7 (a) is a view of the first spring of Fig. 5 viewed from the direction A. Fig.
Fig. 7 (b) is a view of the second spring of Fig. 5 in the direction of B; Fig.
8 is a perspective view of a stator cover according to an embodiment of the present invention.
9 and 10 are perspective views of a back 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 the 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 320. In detail, the connecting member 320 may be coupled to the piston flange portion 132 and bent to extend 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 320.

The linear motor 200 may further include a fixing member 322 for fixing the permanent magnet 260 to the connecting member 320. The fixing member 322 may be composed of a glass fiber or a mixture of carbon fiber and resin. The fixing member 322 is provided so as to surround the inside and outside of the permanent magnet 260 to firmly hold the coupling state of the permanent magnet 260 and the connecting member 320.

The first stator 210 may include coil winding bodies 240 and 242 and a plurality of core block units 211 installed at regular intervals in the circumferential direction of the coil winding bodies 240 and 242 .

Each of the plurality of core block units 211 is formed by stacking a plurality of laminations in the circumferential direction and may be arranged to surround the coil winding bodies 240 and 242. A space of a predetermined size may be formed between adjacent two core block units 211.

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 may further include a supporter 310 supporting the piston 130 and a back cover 280 spaced apart from the supporter 310.

The supporter 310 may be coupled to the piston flange portion 132 and the connecting member 320 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 310 and the stator cover 270 and a second spring 330 supported between the supporter 310 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 spaced axially 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 to be fastened to the stator cover 270 by 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, and FIG. 4 is a view showing a state where a back cover is coupled to a stator cover according to an embodiment of the present invention.

3 and 4, the cylinder 120 is coupled to the frame 110 at one side of the frame 110 and the stator cover 270 is coupled to the frame 110 at the other side of the frame 110. [ 110).

At this time, the stator cover 270 and the frame 110 are coupled by the fastening member S in a state where the linear motor 200 is positioned between the frame 110 and the stator cover 270 .

The spring unit 300 may be seated on the stator cover 270. The back cover 280 may be seated on the spring unit 300.

The back cover 280 may be coupled to the stator cover 270 by a fastening member 292 in a state where the back cover 280 is mounted on the spring unit 300.

The spring unit 300 includes a plurality of first springs 330 seated on the stator cover 270, a supporter 310 seated on the plurality of first springs 330, And a plurality of second springs 332 which are seated on the first springs 332.

The plurality of first springs 330 may be spaced apart from each other in the circumferential direction of the stator cover 270 and the plurality of second springs 332 may be spaced apart in the circumferential direction of the supporter 310 .

The axial length of each of the plurality of first springs 330 is the same as the axial length of each of the plurality of second springs 332.

FIG. 5 is a view showing a combined state of a spring unit and a connecting member according to an embodiment of the present invention, and FIG. 6 is a perspective view of a supporter according to an embodiment of the present invention.

1, 5, and 6, the connecting member 320 may be formed in a cylindrical shape, for example. A plurality of permanent magnets 242 may be spaced around the circumference of the connecting member 320. The fixing member 322 covers the plurality of permanent magnets 242.

The supporter 310 may include a body 311 formed in a cylindrical shape. However, in the present specification, the shape of the body 311 is not limited to a cylindrical shape but may be formed in a polygonal shape.

The body 311 may be connected to the piston 150.

The body 311 may include a coupling portion 311a that can be connected to the piston 150 and a peripheral portion 311b that defines a periphery of the coupling portion 311a.

Specifically, when the connecting member 320 is in contact with the engaging portion 311a and the piston flange portion 132 is in contact with the connecting member 320, the engaging member is engaged with the engaging portion 311a, The member 320 and the piston flange portion 132 are fastened.

The coupling portion 311a may be formed with an opening 312 through which the suction muffler 150 passes and a coupling hole 313 through which the coupling member is coupled.

One or more air flow holes 314 may be formed in the coupling portion 311a to reduce the flow resistance during movement of the supporter 310 together with the piston 130. [

At least one air flow hole 315 may be formed in the peripheral portion 311b to reduce the flow resistance during movement of the supporter 310 together with the piston 130. [

The at least one air flow hole 315 also serves to increase the strength of the peripheral portion 311b.

For example, a plurality of air flow holes 315 may be provided in the circumferential portion 311b. In this case, a plurality of air flow holes 315 may be arranged in the circumferential direction of the circumferential portion 311b have.

The supporter 310 may include a plurality of spring supports 316 extending from the body 311.

For example, the plurality of spring supports 316 may extend in a direction intersecting the axial direction at an end of the peripheral portion 311b.

The first surface of each spring support 316 includes at least one first engagement protrusion 317a for engaging one or more first springs 330 and the second surface of each spring support 316 has one And at least one second coupling protrusion 317b for coupling with the second spring 330.

In this embodiment, for example, the spring supporting portions 316 support a plurality of first springs and a plurality of second springs.

Each of the spring supporting portions 316 may include a plurality of first coupling protrusions 317a spaced apart and a plurality of second coupling protrusions 317b spaced apart from each other.

At this time, the plurality of first engagement protrusions 317a and the plurality of second engagement protrusions 317b may be positioned opposite to each other with respect to the respective spring support portions 316.

The plurality of first engagement protrusions 317a and the plurality of second engagement protrusions 317b may be disposed to overlap with each other in the axial direction.

Each of the plurality of first springs 330 coupled to the plurality of first coupling protrusions 317a and each of the plurality of second springs 332 coupled to the plurality of second coupling protrusions 317a may include a plurality of first springs 330, Lt; / RTI >

The plurality of first springs 330 may be positioned at a position where the elastic force is applied to the spring support portion 316 and at a point where the plurality of second springs 332 apply elastic force to the spring support portion 316 The deformation of each of the spring supporting portions 316 can be minimized.

That is, the supporter 310 is moved in one direction during operation of the compressor, and the spring on one side of the supporter is compressed, while the spring on the other side of the supporter is stretched to support the supporter. Can be minimized.

According to the present embodiment, the supporter 310 includes three spring supporting portions 316, and each spring supporting portion 316 supports two first springs 330 and two second springs 332 can do. Therefore, the supporter can support six first springs and six second springs.

According to this embodiment, as the number of springs that can be supported by the supporter is increased, compared with the case where the conventional compressor uses less than 12 springs, the total spring constant of the spring unit is made equal, The spring constant of the spring of the gas spring (piston) can be reduced, the side force by each spring can be reduced, and the lifting force of the gas bearing (piston) can be improved.

The plurality of spring support portions 316 may be connected by a connection portion 318.

The plurality of spring supporting portions 316 are connected by the connecting portion 318 so that the plurality of spring supporting portions 316 are connected by the elastic force of the springs 330 and 332 supported by the plurality of spring supporting portions 316, (316) can be prevented from being deformed.

The spring supporting portions 316 may be enlarged in width toward the body 331 at the portions where the coupling protrusions 317a and 317b are formed. That is, the width of the portion of each of the spring support portions 316 adjacent to the body 331 is larger than the width of the engagement protrusions 317a and 317b of the respective spring support portions 316.

At least one forming portion 319 may be formed at the connecting portion between the body 311 and the spring supporting portions 316 to prevent deformation of the spring supporting portions 316.

FIG. 7A is a view of the first spring of FIG. 5 viewed from the direction A, and FIG. 7B is a view of the second spring of FIG.

Referring to FIGS. 6 and 7A and 7B, the first spring 330 is coupled to the first coupling protrusion 317a, and the second spring 332 is coupled to the second coupling And is coupled to the projection 317b.

The second spring 332 includes a first end 331 of the first spring 330 and the second spring 332 includes a second end 333. The end portions 331 and 333 of the respective springs 330 and 332 are seated on the spring support portion 316.

In Fig. 7, Os is the center of the first spring 330 and the second spring 332, respectively, and L is a center connecting line connecting the centers of the springs 330 and 332. The center connecting line (L) is parallel to the axial direction.

The line connecting the first end 331 of the first spring 330 and the second end 333 of the second spring 332 is parallel to the center connecting line L. [

A line connecting the first end 331 of the first spring 330 and the second end 333 of the second spring 332 is parallel to the center connecting line L. [ That is, the first end 331 of the first spring 330 and the second end 333 of the second spring 332 are aligned.

The first end portion 331 of the first spring 330 and the second end portion 333 of the second spring 332 are positioned opposite to each other with reference to a line connecting the respective end portions 331 and 333 .

The first end portion 331 of the first spring 330 and the second end portion 333 of the second spring 332 are positioned opposite to each other with reference to a line connecting the end portions of the first spring 330 and the second spring 332, The lines connecting the first end 331 and the second end 333 are parallel to the center connecting line L so that the first spring 330 and the second spring 330 on both sides of the supporter 310, The piston 332 functions as one spring, so that the piston 130 can be smoothly resonated.

Further, there is an advantage that the side forces of the respective springs can be canceled as the respective springs are aligned.

8 is a perspective view of a stator cover according to an embodiment of the present invention.

1, 3, 4 and 8, the stator cover 270 includes a body 271 having an opening 272 through which the piston 130 can pass, And one or more frame engaging portions 274 extending from the frame 110 toward the frame 110.

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 so that the stator cover 270 and the frame 110 are securely fastened.

The plurality of frame engaging 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 a space between adjacent two stator cores 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 between adjacent two stator cores 211. [

As shown in FIG. 3, at least two 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 (not shown) for fastening the fastening member S thereto.

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

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

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 .

The stator cover 270 is coupled to the frame 110 by a small number of frame engaging portions 274 since two or more core block units 211 are positioned between adjacent two frame engaging portions 274. . 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 secure the stator cover 270 and the back cover 280 tightly.

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 292.

Here, the fastening grooves of the respective frame engaging portions 274 and the fastening grooves 277 of the respective back cover engaging portions 276 may be arranged so as not to overlap with each other in the axial direction.

The back cover engaging portion 276 is engaged with the engaging member 292 as the engaging member 292 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 292, 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 to 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 may be formed such that the back cover engaging portion 276 is deformed radially outward of the body 271 in the process of fastening the fastening member 292 to the back cover engaging portion 276 .

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 coupled with the first springs 330. [

The 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 in 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.

The spring support portion 316 of the supporter 310 may be positioned between adjacent two back cover engagement portions 276.

9 and 10 are perspective views of a back cover according to an embodiment of the present invention.

Referring to FIGS. 4, 8, 9 and 10, the back cover 280 may include a body 281 having a refrigerant passage portion 282 through which refrigerant passes.

The back cover 280 may include at least one stator cover engaging portion 283 extending from the body 281 and coupled to the back cover engaging portion 276 and extending from the body 281, And one or more spring supports 288 for supporting the second spring 332.

9 shows that the back cover 280 includes a plurality of stator cover engaging portions 283 and a plurality of spring supports 288 as an example.

The plurality of stator cover engaging portions 283 and the plurality of spring supporting portions 288 may be disposed alternately.

Each of the plurality of stator cover engaging portions 283 may include an extending portion 284 that is axially bent at the body 281 and a fastening flange 285 that is bent at the extending portion 284 . That is, the fastening flange 285 is bent in the direction intersecting the axial direction in the extending portion 284.

Therefore, the body 281 and the fastening flange 285 may be spaced apart from each other in the axial direction.

The fastening flange 285 may include a fastening hole 286 for fastening the fastening member 292 to the back cover fastening part 276. The coupling member 292 is fastened to the coupling hole 286 and the coupling groove 277 of the back cover coupling portion 276 from the coupling flange 285 toward the back cover coupling portion 276 .

According to the present embodiment, since the fastening flange 285 is formed by bending the extending portion 284 extending in the axial direction in the body 281, the fastening force of the fastening member 292 is transmitted to the stator cover engaging portion 283 are absorbed.

Therefore, even if the stator cover engaging portion 283 is deformed during the fastening operation of the fastening member 292, the stator cover engaging portion 283 absorbs the fastening force, so that the body 281 of the back cover 280 It can be prevented from being deformed.

A plurality of guide holes 287 are formed in the fastening flange 285 for passing the guide pins for aligning the fastening holes 277 of the back cover engaging portion 276 with the fastening holes 286 . The fastening holes 286 may be positioned between the plurality of guide holes 287.

The body 291 may be formed with a slit 290 for preventing the fastening force of the fastening member 292 from being transmitted to the spring support portion 288. The spring support 288 and the fastening flange 285 may be axially spaced.

As the fastening member 292 is prevented from transmitting the fastening force of the fastening flange 285 to the spring supporting portion 288, the spring supporting portion 288 is prevented from being deformed, To be supported by the spring support 288 at the position.

The elastic force of the second spring 332 applied to the spring support portion 288 can be prevented from being transmitted to the stator cover engagement portion 283 by the slit 290.

The spring support portions 288 may be formed with spring engagement protrusions 289 for engaging with the plurality of second springs 332, respectively.

At this time, a plurality of spring engaging protrusions 289 may be formed on one spring supporting portion 288.

Accordingly, as each of the plurality of second springs 332 is engaged with each of the plurality of spring coupling protrusions 289, an end portion of the plurality of second springs 332, which contacts the spring support portion 228, Can be prevented from sliding on the spring support portion (228).

Meanwhile, a spacer 350 may be provided between the back cover engaging portion 276 and the fastening flange 285. That is, when the spacer 350 is positioned between the back cover coupling portion 276 and the coupling flange 285, the coupling member 292 is coupled to the coupling flange and the back cover coupling portion 276 .

The spacers 350 are formed by the first springs 330 and the second springs 332 by the tolerances generated in manufacturing the back cover 280, the supporter 310 and the stator cover 270, The distance between the body 271 of the stator cover 270 and the body 281 of the supporter 310 or the supporter 310 and the back cover 280 is not kept constant.

The thickness of the spacer 350 may vary depending on the distance between the body 271 of the stator cover 270 and the body 281 of the supporter 310 or the supporter 310 and the back cover 280 have.

The spacer 350 may include a slot 352 (or a hole) through which the fastening member 350 passes and a plurality of guide holes 354 through which the guide pin passes. The slots 352 (or holes) may be positioned between the plurality of guide holes 354.

The spring support portion 316 of the supporter 310 and the spring support portion 288 of the back cover 280 may be disposed to overlap with each other in the axial direction.

Accordingly, the first engaging protrusion 317a and the second engaging protrusion 317b of the supporter 310 and the spring engaging protrusion 289 of the back cover 280 may be arranged in a line in the axial direction.

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 300: Spring unit
310: Supporter 330: First spring
332: second spring

Claims (15)

  1. 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 linear motor for providing power to the piston;
    A stator cover for supporting the linear motor together with the frame;
    A spring unit for allowing the piston to resonate; And
    And a back cover for supporting the spring unit,
    The spring unit includes:
    A supporter connected to the piston and having a spring support portion,
    A first spring supported on a first surface of the stator cover and the spring support portion,
    A second surface of the spring support portion and a second spring supported by the back cover.
  2. The method according to claim 1,
    Wherein the first spring and the second spring are arranged in line in the axial direction.
  3. 3. The method of claim 2,
    The first spring including a first end seated on a first surface of the spring support,
    The second spring including a second end seated on a second surface of the spring support,
    And a line connecting the first end and the second end is parallel to the axial direction.
  4. The method of claim 3,
    Wherein the first end and the second end are located opposite to each other with respect to the line.
  5. The method according to claim 1,
    The supporter comprising a body connectable to the piston,
    Wherein a plurality of spring supports extend from the body.
  6. 6. The method of claim 5,
    Wherein the plurality of spring supports are connected by a connecting portion.
  7. 6. The method of claim 5,
    The body includes an engaging portion formed with an opening,
    And a circumferential portion extending from the engaging portion,
    And the plurality of spring supporting portions at the end of the peripheral portion extend in a direction intersecting with the axial direction.
  8. 8. The method of claim 7,
    And at least one forming portion for strength reinforcement is formed at a connection portion between the plurality of spring supporting portions and the peripheral portion.
  9. 8. The method of claim 7,
    And at least one air flow hole for air flow is formed in the peripheral portion.
  10. 6. The method of claim 5,
    Wherein each of the spring supporting portions includes a first engaging projection and a second engaging projection to which the first spring and the second spring are engaged.
  11. 11. The method of claim 10,
    Wherein a width of a portion of each of the spring support portions adjacent to the body is larger than a width of a side of the engagement projection of each of the spring support portions.
  12. The method according to claim 1,
    Wherein the back cover includes a spring support portion for supporting the second spring,
    Wherein the spring support portion of the supporter and the spring support portion of the back cover overlap in the axial direction.
  13. The method according to claim 1,
    Wherein the stator cover includes a plurality of back cover fastening portions to be fastened to the back cover,
    And a spring support portion of the supporter is positioned between two adjacent back cover fastening portions.
  14. The method according to claim 1,
    Wherein the axial length of the first spring and the axial length of the second spring are the same.
  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 linear motor for providing power to the piston;
    A stator cover for supporting the linear motor together with the frame;
    A plurality of first springs seated on the stator cover;
    A supporter supporting the plurality of first springs and connected to the piston;
    A plurality of second springs seated on the supporter; And
    And a back cover for supporting the plurality of second springs,
    Wherein the plurality of first springs and the plurality of second springs are arranged in a line in a state in which the plurality of first springs and the plurality of second springs are seated on the supporter.
KR1020140110775A 2014-08-25 2014-08-25 Linear compressor KR20160024217A (en)

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