KR20180091451A - Linear compressor - Google Patents

Abstract

The present invention relates to a linear compressor. The linear compressor comprises: a cylinder in which an axially reciprocating piston is received; an outer stator located radially outward of the cylinder; a frame having a frame main body in which the cylinder is accommodated and a frame flange disposed in the axial direction of the outer stator; a stator cover located axially rearward of the outer stator; and a cover fastening member for fastening the stator cover and the frame to fix the outer stator. The stator cover includes: a cover fastening ring coupled with the cover fastening member; and a cover plate disposed between the cover fastening ring and the outer stator.

Description

[0001] Linear compressor [0002]

The present invention 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 compressors are broadly classified into a reciprocating compressor that compresses the refrigerant while linearly reciprocating the piston inside the cylinder so that a compression space in which the working gas is sucked or discharged is formed between the piston and the cylinder, A rotary compressor for compressing the refrigerant while the roller is eccentrically rotated along the cylinder inner wall and a compression space in which a working space is sucked or discharged between the cylinder and the cylinder is formed between the eccentrically rotated roller and the cylinder, a scroll compressor in which a compression space in which an operating gas is sucked or 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, a linear compressor has been developed in which the piston is directly connected to a driving motor that reciprocates linearly in the reciprocating compressor, and the compression efficiency can be improved without mechanical loss due to motion switching, and is configured with a simple structure.

Normally, in a linear compressor, a piston is linearly reciprocated in a cylinder by a linear motor in a closed shell, and sucks the refrigerant, compresses it, and then discharges it.

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.

Regarding a conventional linear compressor, the present applicant has been registered by applying a patent application (hereinafter referred to as a prior art document).

[Prior Art]

1. Application No. 10-2014-0078762, filed on June 26, 2014, entitled " Linear compressor

2. Application No. 10-2014-0091881, filed on July 21, 2014, entitled " Linear compressor

The linear compressor according to the above [Prior Art] includes a shell provided with a suction portion, a cylinder provided inside the shell and forming a compression space of the refrigerant, a piston provided to be reciprocatable axially in the cylinder, At least one spring for inducing motion and a guide device formed at the inner circumferential surface of the cylinder to increase the degree of freedom of movement of the spring.

In particular, [Prior Art] aims to provide a linear compressor in which deformation of the stator cover is prevented in the process of fastening the stator cover and the frame.

[Prior Art] includes a frame extending from the body of the stator cover, and as the fastening member penetrating the frame is fastened to the fastening portion, the fastening portion of the frame fastening portion absorbs the fastening force of the fastening member. Therefore, even if the frame engaging portion is deformed in the fastening process of the fastening member, the frame engaging portion absorbs the fastening force, thereby preventing the body from being deformed.

However, the configuration of this [prior art document] is advantageous for modification but has a problem that the configuration is too complicated. As a result, the productivity of the compressor is deteriorated and the production cost is high.

The present invention provides a linear compressor provided with a stator cover that is deformed and easy to process by making a portion affected by a fastening force by a fastening member and a portion where various structures should be provided.

In order to solve the problem that the shape is too complicated and the productivity is low, there is provided a linear compressor provided with a stator cover that maintains this function and simplifies the shape.

Also provided is a linear compressor provided with a stator cover having an increased strength of a coupling portion to prevent deformation in the fastening process of the fastening member.

The present invention also provides a linear compressor provided with a stator cover which is easily adaptable to change of engagement position of a fastening member or the like and change of shape.

According to an aspect of the present invention, there is provided a linear compressor including: a cylinder accommodating an axially reciprocating piston; an outer stator located radially outward of the cylinder; a frame body accommodating the cylinder; A stator cover disposed axially rearward of the outer stator and a cover fastening member fastening the stator cover and the frame so as to fix the outer stator, A cover fastening ring coupled with the cover fastening member, and a cover plate disposed between the cover fastening ring and the outer stator.

In particular, the cover plate and the cover fastening ring may be provided as separate members.

For example, the axial length of the cover fastening ring may be longer than the axial length of the cover plate. This corresponds to one of the methods for increasing the strength of the cover fastening ring.

Further, the cover plate and the cover fastening ring can be manufactured by different molding methods. For example, the cover plate may be formed in a sheet metal shape, and the cover fastening ring may be formed by a die casting method.

The cover plate may include a fastening cutout portion through which the cover fastening member passes, and the cover fastening ring may include a cover fastening hole to which the cover fastening member is coupled. That is, since the cover fastening member is not directly coupled to the cover plate, it is hardly affected by the fastening force.

At this time, the fastening cut-out portion may be formed to be recessed inward from the outer surface of the cover plate. In another aspect, the fastening cutout portion may be formed such that a hole through which the cover fastening member passes is extended to the outer surface of the cover plate.

In addition, the cover fastening ring may be provided such that the radial width of the portion where the cover fastening hole is formed is wider inward than the radial width of the portion where the cover fastening hole is not formed.

The cover plate may include a fastening ring seating portion provided to correspond to the shape of the cover fastening ring so that the cover fastening ring is seated.

Particularly, the fastening ring seating portion may be formed with a fastening cutout portion through which the cover fastening member passes.

The frame flange, the outer stator, the cover plate, and the cover fastening ring may be disposed in order in the axial direction. That is, the cover fastening ring is disposed axially spaced apart from the outer stator by the cover plate.

The frame flange and the cover plate may be disposed to cover one radial side of the outer stator, respectively, and the cover fastening ring may be located radially outward of the outer stator. At this time, the cover fastening member is located radially outward of the outer stator, and fastens the frame flange and the cover fastening ring.

According to the present invention, the stator cover is provided to make the cover fastening ring affected by the fastening force of the cover fastening member and the cover plate to which various structures are to be provided. Accordingly, there is an advantage in that it is possible to provide a linear compressor including a stator cover which is prevented from being deformed and easy to be machined.

Further, since the cover fastening ring and the cover plate are provided as separate members, they may be formed to have different lengths in the axial direction. Accordingly, there is an advantage that the strength of the cover fastening ring is sufficiently secured, and deformation of the stator cover is prevented.

In addition, since the cover plate is not directly coupled to the cover fastening member, the cover plate is hardly affected by the fastening force of the cover fastening member, thereby preventing deformation of the stator cover.

Further, since the cover fastening ring and the cover plate are provided as separate members, the cover fastening ring and the cover plate can be manufactured by different molding methods and are easy to process.

Further, since the cover fastening ring and the cover plate are provided in a simple form, the stator cover can be easily manufactured and the productivity is high.

Further, the cover plate can be easily handled without changing the shape even if the engagement position of the cover fastening member is changed in accordance with the change of the structure and shape such as the size of the outer stator.

1 is an external perspective view showing a configuration of a linear compressor according to an embodiment of the present invention.
2 is an exploded perspective view of a shell and a shell cover of a linear compressor according to an embodiment of the present invention.
3 is an exploded perspective view of internal components of a linear compressor according to an embodiment of the present invention.
4 is a cross-sectional view taken along line I-I 'of FIG.
5 is a perspective view showing a frame, a motor assembly, and a stator cover according to an embodiment of the present invention.
6 is a perspective view showing a frame according to an embodiment of the present invention.
7 is a perspective view showing a stator cover according to an embodiment of the present invention.
8 is a view showing a cover plate according to an embodiment of the present invention.
9 is a view showing a cover fastening ring according to an embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. It is to be understood, however, that the spirit of the invention is not limited to the embodiments shown and that those skilled in the art, upon reading and understanding the spirit of the invention, may easily suggest other embodiments within the scope of the same concept.

FIG. 1 is an external perspective view showing a configuration of a linear compressor according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a shell and a shell cover of a linear compressor according to an embodiment of the present invention.

Referring to FIGS. 1 and 2, a linear compressor 10 according to an embodiment of the present invention includes a shell 101 and shell covers 102 and 103 coupled to the shell 101. In a broad sense, the shell covers 102 and 103 can be understood as one configuration of the shell 101. [

On the lower side of the shell 101, the legs 50 can be engaged. The legs 50 may be coupled to the base of the product on which the linear compressor 10 is installed. For example, the product includes a refrigerator, and the base may include a machine room base of the refrigerator. As another example, the product may include an outdoor unit of the air conditioner, and the base may include a base of the outdoor unit.

The shell 101 has a substantially cylindrical shape and can be arranged in a lateral direction or in an axial direction. 1, the shell 101 may be elongated in the transverse direction and may have a somewhat lower height in the radial direction. That is, since the linear compressor 10 can have a low height, when the linear compressor 10 is installed in the machine room base of the refrigerator, the height of the machine room can be reduced.

A terminal 108 may be provided on the outer surface of the shell 101. The terminal 108 is understood as a configuration for transmitting external power to the motor assembly 140 (see Fig. 3) of the linear compressor. The terminal 108 may be connected to the lead of the coil 141c (see FIG. 3).

On the outside of the terminal 108, a bracket 109 is provided. The bracket 109 may include a plurality of brackets surrounding the terminal 108. The bracket 109 may function to protect the terminal 108 from an external impact or the like.

Both sides of the shell 101 are configured to be open. On both sides of the opened shell 101, the shell covers 102 and 103 can be coupled. Specifically, the shell covers 102 and 103 are provided with a first shell cover 102 coupled to one side of the shell 101 that is open, and a second shell cover 102 coupled to the other side of the shell 101, (103). By the shell covers 102 and 103, the inner space of the shell 101 can be sealed.

1, the first shell cover 102 is located on the right side of the linear compressor 10 and the second shell cover 103 is located on the left side of the linear compressor 10 . In other words, the first and second shell covers 102 and 103 may be arranged to face each other.

The linear compressor 10 further includes a plurality of pipes 104, 105, and 106 which are provided in the shell 101 or the shell covers 102 and 103 to suck, discharge, or inject refrigerant.

The plurality of pipes 104, 105, and 106 are provided with a suction pipe 104 for allowing refrigerant to be sucked into the linear compressor 10, a discharge pipe 104 for discharging the compressed refrigerant from the linear compressor 10, (105) and a process pipe (106) for replenishing refrigerant to the linear compressor (10).

For example, the suction pipe 104 may be coupled to the first shell cover 102. The refrigerant can be sucked into the linear compressor (10) along the axial direction through the suction pipe (104).

The discharge pipe 105 may be coupled to the outer circumferential surface of the shell 101. The refrigerant sucked through the suction pipe 104 can be compressed while flowing in the axial direction. The compressed refrigerant can be discharged through the discharge pipe 105. The discharge pipe 105 may be disposed at a position adjacent to the second shell cover 103 than the first shell cover 102.

The process pipe 106 may be coupled to the outer circumferential surface of the shell 101. The operator can inject the refrigerant into the linear compressor 10 through the process pipe 106.

The process pipe 106 may be coupled to the shell 101 at a different height than the discharge pipe 105 to avoid interference with the discharge pipe 105. The height is understood as a distance in a vertical direction (or a radial direction) from the legs 50. The discharge pipe (105) and the process pipe (106) are coupled to the outer peripheral surface of the shell (101) at different heights, so that the operator can enjoy the convenience of operation.

At least a portion of the second shell cover 103 may be positioned adjacent to the inner circumferential surface of the shell 101, corresponding to the point where the process pipe 106 is coupled. In other words, at least a portion of the second shell cover 103 may act as a resistance of the refrigerant injected through the process pipe 106.

Therefore, from the viewpoint of the flow path of the coolant, the size of the flow path of the coolant flowing through the process pipe 106 is formed to be small as it enters the inner space of the shell 101. In this process, the pressure of the refrigerant can be reduced to vaporize the refrigerant, and in this process, the oil contained in the refrigerant can be separated. Therefore, the refrigerant compression performance can be improved while the oil-separated refrigerant flows into the interior of the piston 130 (see FIG. 3). The oil fraction can be understood as operating oil present in the cooling system.

On the inner surface of the first shell cover 102, a cover supporting portion 102a is provided. A second supporting device 185, which will be described later, may be coupled to the cover supporting portion 102a. The cover supporting portion 102a and the second supporting device 185 can be understood as devices for supporting the main body of the linear compressor 10. [

In this case, the main body of the linear compressor 10 refers to a part provided inside the shell 101, and may include, for example, a driving part that reciprocates forward and backward and a supporting part that supports the driving part. The drive unit may include components such as a piston 130, a magnet frame 138, a permanent magnet 146, a supporter 137, and a suction muffler 150. The support portion may include components such as resonance springs 176a and 176b, a rear cover 170, a stator cover 200, a first support device 165, and a second support device 185 and the like.

A stopper 102b may be provided on the inner surface of the first shell cover 102. [ The stopper 102b is configured to prevent the main body of the compressor, in particular, the motor assembly 140 from being damaged by colliding with the shell 101 due to vibration or impact generated during transportation of the linear compressor 10, do. The stopper 102b is located adjacent to a rear cover 170 to be described later so that when the linear compressor 10 is shaken, the rear cover 170 interferes with the stopper 102b, It is possible to prevent the shock from being transmitted to the assembly 140.

The inner circumferential surface of the shell 101 may be provided with a spring coupling portion 101a. For example, the spring engagement portion 101a may be disposed at a position adjacent to the second shell cover 103. The spring coupling portion 101a may be coupled to a first support spring 166 of a first support device 165, which will be described later. The main body of the compressor can be stably supported on the inner side of the shell 101 by the engagement of the spring coupling portion 101a and the first support device 165. [

FIG. 3 is an exploded perspective view of internal components of a linear compressor according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view illustrating an internal configuration of a linear compressor according to an embodiment of the present invention.

3 and 4, the linear compressor 10 according to the embodiment of the present invention includes a cylinder 120 provided inside the shell 101, and a reciprocating linear motion And a motor assembly 140 as a linear motor for imparting a driving force to the piston 130. The motor 130 includes a piston 130, When the motor assembly 140 is driven, the piston 130 can reciprocate in the axial direction.

The linear compressor 10 further includes a suction muffler 150 coupled to the piston 130 to reduce noise generated from the refrigerant sucked through the suction pipe 104. The refrigerant sucked through the suction pipe 104 flows into the piston 130 through the suction muffler 150. For example, in the course of the refrigerant passing through the suction muffler 150, the flow noise of the refrigerant can be reduced.

The suction muffler 150 includes a plurality of mufflers 151, 152 and 153. The plurality of mufflers 151, 152 and 153 include a first muffler 151, a second muffler 152 and a third muffler 153 coupled to each other.

The first muffler 151 is positioned inside the piston 130 and the second muffler 152 is coupled to the rear side of the first muffler 151. The third muffler 153 accommodates the second muffler 152 therein and may extend to the rear of the first muffler 151. From the viewpoint of the flow direction of the refrigerant, the refrigerant sucked through the suction pipe 104 can pass through the third muffler 153, the second muffler 152 and the first muffler 151 in order. In this process, the flow noise of the refrigerant can be reduced.

The suction muffler 150 further includes a muffler filter 155. The muffler filter 155 may be positioned at an interface between the first muffler 151 and the second muffler 152. For example, the muffler filter 155 may have a circular shape, and the outer periphery of the muffler filter 155 may be supported between the first and second mufflers 151 and 152.

Hereinafter, a direction is defined.

The term "axial direction" can be understood as a direction in which the piston 130 reciprocates, that is, a lateral direction in FIG. Of these "axial directions", the direction from the suction pipe 104 toward the compression space P, that is, the direction in which the refrigerant flows is referred to as "forward" and the opposite direction is defined as "rearward". When the piston 130 moves forward, the compression space P can be compressed.

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

The piston 130 includes 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 cylinder (120) is configured to receive at least a portion of the first muffler (151) and at least a portion of the piston body (131).

A compression space P in which the refrigerant is compressed by the piston 130 is formed in the cylinder 120. A suction hole 133 for introducing a refrigerant into the compression space P is formed in a front portion of the piston body 131. A suction hole 133 is formed in front of the suction hole 133, A suction valve 135 is provided. At a substantially central portion of the suction valve 135, a fastening hole to which a predetermined fastening member is coupled is formed.

A discharge cover 160 which forms a discharge space 160a of the refrigerant discharged from the compression space P and a discharge cover 160 which is coupled to the discharge cover 160 and is disposed in front of the compression space P, There is provided a discharge valve assembly 161, 163 for selectively discharging the compressed refrigerant. The discharge space 160a includes a plurality of spaces defined by inner walls of the discharge cover 160. The plurality of space portions are arranged in the front-rear direction and can communicate with each other.

The discharge valve assembly 161 and 163 are provided with a discharge valve 161 that opens when the pressure in the compression space P becomes equal to or higher than the discharge pressure and causes the refrigerant to flow into the discharge space of the discharge cover 160, And a spring assembly 163 provided between the cover 161 and the discharge cover 160 to provide an elastic force in the axial direction.

The spring assembly 163 includes a valve spring 163a and a spring support portion 163b for supporting the valve spring 163a on the discharge cover 160. [ For example, a rear portion or a rear surface of the discharge valve 161 is positioned so as to be supported on the front surface of the cylinder 120. When the discharge valve 161 is supported on the front surface of the cylinder 120, the compression space P is maintained in a closed state. When the discharge valve 161 is separated from the front surface of the cylinder 120, The space P is opened so that the compressed refrigerant in the compression space P can be discharged.

The compression space P is understood as a space formed between the suction valve 135 and the discharge valve 161. The suction valve 135 is formed on one side of the compression space P and the discharge valve 161 is disposed on the other side of the compression space P, that is, on the opposite side of the suction valve 135 Can be provided.

When the pressure in the compression space P becomes lower than the discharge pressure and becomes lower than the suction pressure in the course of reciprocating linear motion of the piston 130 in the cylinder 120, the suction valve 135 is opened, And 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 163a is deformed forward to open the discharge valve 161, and the refrigerant is discharged from the compression space P , And is discharged to the discharge space of the discharge cover (160). When the discharge of the refrigerant is completed, the valve spring 163a provides a restoring force to the discharge valve 161 so that the discharge valve 161 is closed.

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

The linear compressor 10 further includes a roof pipe 162b which is coupled to the cover pipe 162a and transfers the refrigerant flowing through the cover pipe 162a to the discharge pipe 105. [ One side of the loop pipe 162b may be coupled to the cover pipe 162a and the other side may be coupled to the discharge pipe 105. [

The loop pipe 162b is made of a flexible material and can be relatively long. The loop pipe 162b may extend from the cover pipe 162a along the inner circumferential surface of the shell 101 and may be coupled to the discharge pipe 105. [ For example, the loop pipe 162b may have a coiled shape.

The linear compressor (10) further includes a frame (110). The frame 110 is understood as a structure for fixing the cylinder 120. In detail, the cylinder 120 may be disposed inside the frame 110 and fixed.

In addition, the cylinder 120 and the frame 110 may be made of aluminum or an aluminum alloy.

The frame 110 is disposed to surround the cylinder 120. That is, the cylinder 120 may be positioned to be received inside the frame 110. The discharge cover 160 may be coupled to the front surface of the frame 110 by fastening members.

The motor assembly 140 includes an outer stator 141 fixed to the frame 110 so as to surround the cylinder 120 and an inner stator 148 disposed apart from the inner stator 141 And a permanent magnet 146 positioned in the space between the outer stator 141 and the inner stator 148.

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

The permanent magnet 146 may be installed on the magnet frame 138. The magnet frame 138 has a substantially cylindrical shape and may be arranged to be inserted into a space between the outer stator 141 and the inner stator 148.

 4, the magnet frame 138 is coupled to the piston flange portion 132, extends in the outer radial direction, and can be bent forward. The permanent magnet 146 may be installed at a front portion of the magnet frame 138. When the permanent magnet 146 reciprocates, the piston 130 can reciprocate axially together with the permanent magnet 146.

The outer stator 141 includes coil winding bodies 141b, 141c and 141d and a stator core 141a.

The stator core 141a includes a plurality of core blocks formed by stacking a plurality of laminations in a circumferential direction. The plurality of core blocks may be disposed so as to surround at least a part of the coil winding body 141b, 141c, and 141d.

The coil windings 141b, 141c and 141d include a bobbin 141b and a coil 141c wound around the bobbin in the circumferential direction. The coil windings 141b, 141c and 141d further include a terminal portion 141d for guiding the power line connected to the coil 141c to be drawn out or exposed to the outside of the outer stator 141. The terminal portion 141d may be arranged to be inserted into a terminal insertion portion 119c (see Fig. 6) described later.

A stator cover 200 is provided at one side of the outer stator 141. That is, one side of the outer stator 141 may be supported by the frame 110 and the other side may be supported by the stator cover 200. The frame 110 is positioned in the axial direction of the outer stator 141 and the stator cover 200 is positioned behind the outer stator 141 in the axial direction.

The linear compressor 10 further includes a cover fastening member 200a for fastening the stator cover 200 and the frame 110 together. The cover fastening member 200a extends forward toward the frame 110 through the stator cover 200 and is coupled to the first fastening hole 119a of the frame 110 .

The inner stator 148 is fixed to the outer periphery of the frame 110. The inner stator 148 is formed by laminating a plurality of laminations in the circumferential direction from the outside of the frame 110.

The linear compressor (10) further includes a supporter (137) for supporting the piston (130). The supporter 137 is coupled to the rear side of the piston 130 and the muffler 150 can be disposed inside the supporter 137. The piston flange portion 132, the magnet frame 138, and the supporter 137 may be fastened by a fastening member.

To the supporter 137, a balance weight 179 may be combined. The weight of the balance weight 179 can be determined based on the operating frequency range of the compressor main body.

The linear compressor 10 further includes a rear cover 170 coupled to the stator cover 200 and extended rearwardly and supported by a second support device 185. In detail, the rear cover 170 includes three support legs, and the three support legs can be coupled to the rear surface of the stator cover 200. [

A spacer 181 may be interposed between the three support legs and the rear surface of the stator cover 200. The distance from the stator cover 200 to the rear end of the rear cover 170 can be determined by adjusting the thickness of the spacer 181. The rear cover 170 may be spring-supported to the supporter 137.

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

The linear compressor 10 further includes a plurality of resonance springs 176a and 176b whose natural frequencies are adjusted so that the piston 130 can resonate.

The plurality of resonance springs 176a and 176b are provided with a first resonance spring 176a supported between the supporter 137 and the stator cover 200 and a second resonance spring 176b between the supporter 137 and the rear cover 170 And a second resonance spring 176b supported.

By the action of the plurality of resonance springs (176a, 176b), stable movement of the driving part reciprocating in the linear compressor (10) is performed, and vibration or noise caused by the movement of the driving part can be reduced.

The supporter 137 includes a spring support portion 137a coupled to the first resonance spring 176a.

The linear compressor 10 further includes a first supporting device 165 coupled to the discharge cover 160 and supporting one side of the main body of the compressor 10. The first support device 165 may be disposed adjacent to the second shell cover 103 to elastically support the main body of the compressor 10. In detail, the first supporting device 165 includes a first supporting spring 166. [ The first support spring 166 may be coupled to the spring coupling portion 101a.

The linear compressor 10 further includes a second supporting device 185 coupled to the rear cover 170 and supporting the other side of the main body of the compressor 10. [ The second support device 185 may be coupled to the first shell cover 102 to elastically support the main body of the compressor 10. Specifically, the second support device 185 includes a second support spring 186. The second support spring 186 may be coupled to the cover support portion 102a.

The linear compressor 10 includes a plurality of sealing members 110a, 128a, 128b, 129a, and 129b for increasing a coupling force between the frame 110 and components around the frame 110. [

In detail, the plurality of sealing members 110a, 128a, 128b, 129a, and 129b includes a first sealing member 110a provided at a portion where the frame 110 and the discharge cover 160 are coupled. The second and third sealing members 128a and 128b provided at a portion where the frame 110 and the cylinder 120 are coupled are formed in the plurality of sealing members 110a, 128a, 128b, 129a, and 129b .

The plurality of sealing members 110a, 128a, 128b, 129a, and 129b may further include a fourth sealing member 129a provided between the cylinder 120 and the frame 110. The plurality of sealing members 110a, 128a, 128b, 129a and 129b may further include a fifth sealing member 129b provided at a portion where the frame 110 and the inner stator 148 are coupled to each other .

The first to fifth sealing members 110a, 128a, 128b, 129a, and 129b may have a ring shape.

5 is a perspective view showing a frame, a motor assembly, and a stator cover according to an embodiment of the present invention.

As shown in FIG. 5, the frame 110 and the stator cover 200 are fastened by the cover fastening member 200a. Also, the outer stator 141 is positioned between the frame 110 and the stator cover 200.

5, the cylinder 120 coupled to the inside of the frame 111 and the inner stator 148 coupled to the outside of the frame 111 are shown.

The permanent magnet 146, the piston 130, the resonance springs 176a and 176b, and the rear cover 170 are coupled to the upper side with reference to FIG. In detail, the permanent magnet 146 is inserted between the inner stator 148 and the outer stator 141, and the piston 130 is inserted and coupled to the inside of the cylinder 120.

5, the discharge cover 160 and the like are coupled to the lower side.

That is, FIG. 5 shows a part of the configuration of the linear compressor 10, and particularly shows a configuration that is coupled by the cover fastening member 200a.

At this time, the outer stator 141 is fixed as the frame 110 and the stator cover 200 are fastened by the cover fastening member 200a. That is, the frame 110, the outer stator 141, and the stator cover 200 are held in close contact with the cover fastening member 200a.

As described above, the outer stator 141 includes a plurality of stator cores 141a and the coil winding bodies 141b, 141c, and 141d. The plurality of stator cores 141a are spaced apart from each other and a space in which the cover fastening member 200a can be positioned is formed between adjacent two stator cores 230. [

Hereinafter, the frame 110 and the stator cover 200 coupled by the cover fastening member 200a will be described in detail with reference to FIG.

6 is a perspective view showing a frame according to an embodiment of the present invention.

6, the frame 110 includes an axially extending frame body 111 and a frame flange 112 extending radially outwardly from the frame body 111. As shown in FIG.

The frame body 111 has a cylindrical shape having a central axis in the axial direction, and the cylinder 120 is accommodated in the frame body 111.

 The frame flange 112 may extend from the outer circumferential surface of the frame body 111 to form a first predetermined angle. For example, the first setting angle may be about 90 degrees.

The front surface of the frame flange 112 may be provided with an installation groove on which the first sealing member 127 is installed. That is, the first sealing member 127 is inserted into the mounting groove, and the frame 110 and the discharge cover 160 are coupled. Accordingly, refrigerant can be prevented from flowing between the frame 110 and the discharge cover 160.

The frame flange 112 further includes fastening holes 119a and 119b to which a predetermined fastening member is coupled to fasten the frame 110 and peripheral components. The fastening holes 119a and 119b may be disposed along the outer circumference of the frame flange 112, respectively.

The fastening holes 119a and 119b include a first fastening hole 119a to which the cover fastening member 200a is coupled. A plurality of the first fastening holes 119a may be spaced apart from each other. For example, as shown in FIG. 6, three first fastening holes 119a may be formed.

The coupling holes 119a and 119b may further include a second coupling hole 119b to which a coupling member for coupling the ejection cover 160 and the frame 110 is coupled. The plurality of second fastening holes 119b may be spaced apart from each other. For example, three of the second fastening holes 119b may be formed.

Three of the first and second fastening holes 119a and 119b are disposed along the outer periphery of the frame flange 112, respectively. That is, since the frame 110 is uniformly arranged in the circumferential direction with respect to the center of the frame 110, the frame 110 is supported at three points on peripheral components, for example, the stator cover 100 and the discharge cover 160, Can be combined with peripheral components.

The frame flange 112 is formed with a terminal insertion portion 119c for providing a lead-out path of the terminal portion 141d of the motor assembly 140. [ The terminal inserting portion 119c is formed such that the frame flange 112 is cut in the front-rear direction.

The terminal portion 141d may extend forward from the coil 141c and be inserted into the terminal insertion portion 119c. The terminal portion 141d may be exposed to the outside from the motor assembly 140 and the frame 110 and may be connected to a cable directed to the terminal 108. [

A plurality of the terminal inserting portions 119c may be provided and the plurality of terminal inserting portions 119c may be disposed along the outer circumference of the frame flange 112. Of the plurality of terminal inserting portions 119c, only one terminal inserting portion 119c into which the terminal portions 141d are inserted is provided. It is understood that the remaining terminal inserting portion 119c is provided for preventing the frame 110 from being deformed.

For example, in the frame flange 112, three terminal insertion portions 119c are formed. The terminal portion 141d is inserted into one terminal insertion portion 119c and the terminal portion 141d is not inserted into the remaining two terminal insertion portions 119c.

A great deal of stress may be applied to the frame 110 when the stator cover 200 or the discharge cover 160 is fastened or coupled with the cylinder 120. If only one terminal inserting portion 119c is formed in the frame flange 112, the stress may be concentrated at a specific point so that the frame flange 112 may be deformed.

Thus, in the present embodiment, the terminal insertion portions 119c are formed at three positions of the frame flange 112, that is, evenly arranged in the circumferential direction with respect to the center of the frame 110, Can be prevented from being generated.

6, the frame 110 further includes a frame inclined portion 113 extending obliquely from the frame flange 112 toward the frame body 111. As shown in FIG. The outer surface of the frame inclined portion 113 may extend to form a second predetermined angle with respect to the outer peripheral surface of the frame body 111, that is, the axial direction. For example, the second setting angle may be formed to be larger than 0 degrees and smaller than 90 degrees.

The frame connection part 113 is formed with a gas hole 114 (see FIG. 2) for guiding the refrigerant discharged from the discharge valve 161 to the cylinder 120. In detail, the gas hole 114 extends from the frame flange 112 and extends to the frame body 111 through the frame connection part 113.

Meanwhile, the frame connection part 113 may be provided along the periphery of the frame body 111. Only one frame connection part 113, in which the gas holes 114 are formed, is provided among the plurality of frame connection parts 113. It is understood that the remaining frame connecting portions 113 are provided for preventing the frame 110 from being deformed.

For example, in the frame 110, three frame connection portions 113 are formed. The gas hole 114 is formed in one frame connecting portion 113 and the gas hole 114 is not formed in the remaining two frame connecting portions 113. This is to prevent stress concentration as described above.

As shown in FIG. 6, the frame body 111 includes a second installation groove 111b in which the fifth sealing member 129b is installed. The fifth sealing member 129b is inserted into the second installation groove 111b and the frame 110 and the inner stator 148 are engaged. Accordingly, refrigerant can be prevented from flowing between the frame 110 and the inner stator 148.

FIG. 7 is a perspective view showing a stator cover according to an embodiment of the present invention, FIG. 8 is a view showing a cover plate according to an embodiment of the present invention, FIG. 9 is a view showing a cover fastening ring according to an embodiment of the present invention to be.

As shown in FIGS. 7 to 9, the stator cover 200 includes a cover plate 210 and a cover fastening ring 220.

5, the cover plate 210 is disposed on one side of the outer stator 141, and the cover fastening ring 220 covers the cover plate 210, which is not in contact with the outer stator 141, As shown in FIG. That is, the frame flange 112, the outer stator 141, the cover plate 210, and the cover fastening ring 220 are disposed in order.

7, the cover plate 210 and the cover fastening ring 220 are detachable from each other. That is, the cover plate 210 and the cover fastening ring 220 are provided as separate members. In addition, the cover plate 210 and the cover fastening ring 220 may be integrally formed as shown in FIG.

The cover plate 210 is provided in a flat plate shape having a predetermined thickness. Here, the thickness refers to the axial length of the linear compressor 10. 8, the cover plate 210 is provided with a disk having an opening 210a on the inner side, that is, a donut-shaped flat plate having a predetermined thickness.

A spring seat 213 on which the resonance springs 176a and 176b are seated is provided on one side of the cover plate 210. Specifically, the spring seating portion 213 is provided to support one side of the first resonance spring 176a. The first resonance spring 176a is disposed between the spring seating portion 213 of the cover plate 210 and the spring support portion 137a of the supporter 137. [

The spring receiving portion 213 and the spring supporting portion 137a are also provided in three pairs and each of the six spring receiving portions 213 and the spring supporting portions 137a are provided by six springs constituted by three pairs of the first resonant spring 176a. For example, as shown in FIG. 8, the spring seating portions 213 are arranged evenly in the circumferential direction with respect to the center in three pairs. Further, the pair of spring seating portions 213 are spaced apart at a predetermined interval.

In addition, fastening holes 214 and 215 formed between a pair of adjacent spring seating portions 213 are formed on one side of the cover plate 210. As shown in FIG. 8, three fastening holes 214 and 215 are provided between adjacent pair of spring seating portions 213.

The fastening holes 214 and 215 include a third fastening hole 214 coupled to the rear cover 170 by a predetermined fastening member. The fastening holes 214 and 215 include fastening holes 215 on both sides of the third fastening hole 214. In other words, the third fastening holes 214 are arranged in the circumferential direction with respect to the center of the three fastening holes 214, and the fastening holes 215 are provided at six sides and are respectively disposed on both sides of the third fastening holes 214 do.

At this time, the rear cover 170 may be provided with a fastening hole corresponding to the fastening hole of the cover plate 210. Specifically, three fastening holes are provided in three support legs included in the rear cover 170, respectively. Therefore, the cover plate 210 and the rear cover 170 are disposed so that the respective fastening holes correspond to each other, and a predetermined fastening member is engaged with the third fastening hole 214. Also, the spacer 181 disposed between the rear cover 170 and the stator cover 210 may be provided with holes corresponding to the fastening holes.

The cover plate 210 is provided with a fastening ring seating portion 211 on which the cover fastening ring 220 is seated. The fastening ring seating portions 211 are provided so as to correspond to each other in the form of the cover fastening ring 220. The fastening ring seating portion 211 is formed with a fastening cutout portion 212 through which the cover fastening member 220 passes.

As shown in FIG. 8, the fastening cut-out portion 212 is provided inwardly recessed from the outer surface of the cover plate 210. That is, it can be understood that the fastening cutout portion 212 is a part of the outer surface of the cover plate 210.

In other respects, the fastening cutout portion 212 is formed in such a shape that a hole through which the cover fastening member 200a passes is extended to the outer side surface. Accordingly, even if the engaging position of the cover fastening member 200a is changed according to the shape and size of the outer stator 141, the fastening cut-out portion 212 is not required to be changed.

For example, when the outer stator 141 is extended in the radial direction, the engagement position of the cover fastening member 200a is moved radially outward. Since the hole through which the cover fastening member 200a passes is extended to the outer side, the fastening cutout portion 212 can receive the cover fastening member 200a even if the position of the cover fastening member 200a moves outward.

The fastening cutout portions 212 are disposed between the pair of spring seating portions 213, respectively. Particularly, the fastening ring seating portion 211 is formed to be wider inward between the pair of spring seating portions 213, and the fastening cutout portion 212 is formed at the position.

As described above, the cover fastening ring 220 is provided in a shape corresponding to the fastening ring seating portion 211. The outer surface of the cover fastening ring 220 and the outer surface of the cover plate 210 correspond to each other. That is, the outer diameter of the cover fastening ring 220 and the cover plate 210 may be the same.

Further, the cover fastening ring 220 has a predetermined thickness, that is, an axial length. The axial length of the cover fastening ring 220 may be longer than the axial length of the cover plate 210. That is, the cover fastening ring 220 may be thicker than the cover plate 210.

The cover fastening ring 220 includes a cover fastening hole 222 which is engaged with the cover fastening member 200a. The portion where the cover fastening hole 222 is formed is formed wider inward than a portion where the cover fastening hole 222 is not formed. That is, as shown in FIG. 9, the outer surface of the cover fastening ring 220 is provided in a circular shape, but the inner surface of the cover fastening ring 220 is partially protruded inward. Due to this shape, when the cover fastening member 200a is coupled to the cover fastening ring 220, sufficient rigidity can be secured.

A cover fastening member seating portion 222a on which a bolt or a head of the cover fastening member 200a is seated is provided on one side of the cover fastening hole 222. [ The cover fastening member seating portion 222a is formed to be wider than the cover fastening hole 222 corresponding to the shape of the bolt or head. Therefore, as shown in FIG. 5, the cover fastening member 200a can be stably stuck to the cover fastening ring 220. FIG.

5, the frame flange 112, the outer stator 141, the cover plate 210, and the cover 200 are assembled together by the cover fastening member 200a. And fastening rings 220 are arranged in order.

First, the cover fastening member 200a extends through the first fastening hole 119a of the frame flange 112 toward the outer stator 141. This is an example, and the cover fastening member 200a may be coupled to the first fastening hole 119a without passing through the first fastening hole 119a.

The cover fastening member 200a extending along the outer side of the outer stator 141 passes through the cover plate 210 and is engaged with the cover fastening ring 220. [ Specifically, it passes through the fastening cut-off portion 212, passes through the cover fastening hole 222, and is coupled with a bolt or a head.

Accordingly, the frame 110, the outer stator 141, and the stator cover 200 may be combined. At this time, a force is applied to the stator cover 200 and the frame 100 by the fastening force of the cover fastening member 200a.

Since the cover plate 210 passes without being coupled with the cover fastening member 200a, the cover plate 210 is hardly affected by the fastening force as described above. In addition, the frame 110 and the cover fastening ring 220, to which the cover fastening member 200a is coupled, are relatively thick and may not be deformed by the fastening force.

In addition, since the cover plate 210 is hardly affected by the fastening force, the spring seating portion 213 and the fastening holes 214 and 215 can be formed in a sheet metal shape so as to be easily formed. Further, the cover fastening ring 220 may be formed of a material or a molding method having a higher rigidity than the cover plate 210 so as not to be deformed by the fastening force.

Consequently, the stator cover 200 is provided so as to double the portion affected by the fastening force by the cover fastening member 200a and the portion where various structures are to be provided. Accordingly, the linear compressor 10 according to the principles of the present invention can include a stator cover 200 that is deformable and easy to process.

10: compressor 110: frame
111: frame body 112: frame flange
120: cylinder 130: piston
140: motor assembly 141: outer stator
200: stator cover 210: cover plate
220: Cover tightening ring

Claims (12)

A cylinder accommodating a piston reciprocating in an axial direction;
An outer stator located radially outward of the cylinder;
A frame having a frame body in which the cylinder is received and a frame flange positioned in the axial direction of the outer stator;
A stator cover located axially rearward of the outer stator; And
And a cover fastening member for fastening the stator cover and the frame to fix the outer stator,
In the stator cover,
A cover fastening ring coupled with the cover fastening member; And
And a cover plate disposed between the cover fastening ring and the outer stator. The method according to claim 1,
Wherein the cover plate and the cover fastening ring are provided separately from each other. 3. The method of claim 2,
And the axial length of the cover fastening ring is longer than the axial length of the cover plate. 3. The method of claim 2,
Wherein the cover plate and the cover fastening ring are manufactured by different molding methods. The method according to claim 1,
Wherein the cover plate includes a fastening cutout portion through which the cover fastening member passes,
Wherein the cover fastening ring includes a cover fastening hole to which the cover fastening member is coupled. 6. The method of claim 5,
Wherein the fastening cut-out portion is formed to be recessed inward from an outer surface of the cover plate. 6. The method of claim 5,
Wherein the fastening cutout portion is formed in a shape in which a hole through which the cover fastening member extends is extended to an outer surface of the cover plate. 6. The method of claim 5,
Wherein the cover fastening ring is provided such that a radial width of a portion where the cover fastening hole is formed is wider inward than a radial width of a portion where the cover fastening hole is not formed. The method according to claim 1,
Wherein the cover plate includes a fastening ring seating portion provided so as to correspond to the shape of the cover fastening ring so that the cover fastening ring is seated. 10. The method of claim 9,
And a fastening cutout portion through which the cover fastening member passes is formed in the fastening ring seating portion. The method according to claim 1,
Wherein the frame flange, the outer stator, the cover plate, and the cover fastening ring are disposed in order in the axial direction. 12. The method of claim 11,
The frame flange and the cover plate are disposed so as to respectively cover one radial side of the outer stator,
And the cover fastening ring is located radially outward of the outer stator.

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