KR102067096B1 - A linear compressor - Google Patents

Abstract

The present invention relates to a linear compressor.
A linear compressor according to an embodiment of the present invention, a shell provided with a suction unit for suction of the refrigerant; A cylinder provided inside the shell; A piston reciprocating in the cylinder; A suction muffler movable together with the piston to form a refrigerant passage; A suction guide device provided at one side of the piston and configured to guide the refrigerant sucked from the suction unit to the suction muffler; And a back cover coupled to the suction guide device, wherein the back cover includes: a cover body having an insertion hole into which the suction guide device is inserted; And an indentation portion extending outwardly from the cover body and forcibly indenting at least a portion of the suction guide device.

Description

Linear compressor {A linear compressor}

The present invention relates to a linear compressor.

In general, a compressor is a mechanical device that increases pressure by receiving power from a power generator such as an electric motor or a turbine to compress air, refrigerant, or various other working gases. It is widely used throughout.

If the compressor is largely classified, a reciprocating compressor for compressing the refrigerant while the piston reciprocates linearly inside the cylinder is formed by forming a compression space in which the working gas is absorbed and discharged between the piston and the cylinder. A rotary compressor and orbiting scroll (Orbiting) for compressing the refrigerant while the roller is eccentrically rotated along the inner wall of the cylinder is formed between the roller and the eccentric rotating roller and the cylinder is formed. Compression spaces are formed between the scroll and the fixed scroll, and the working gas is absorbed and discharged, and the rotating scroll rotates along the fixed scroll and may be classified as a scroll compressor that compresses the refrigerant.

Recently, among the reciprocating compressors, in particular, a piston is directly connected to a reciprocating linear drive motor, thereby improving compression efficiency without mechanical loss due to movement conversion, and linear compressors having a simple structure have been developed.

Usually, the linear compressor is configured to suck, compress and then discharge the refrigerant while the piston moves in a closed shell to reciprocate linearly inside the cylinder by the linear motor.

The linear motor is configured such that a permanent magnet is positioned between the inner stator and the outer stator, and the permanent magnet is driven to linearly reciprocate by mutual electromagnetic force between the permanent magnet and the inner (or outer) stator. Then, as the permanent magnet is driven in a state connected to the piston, the piston sucks and compresses the refrigerant while discharging the refrigerant while reciprocating linearly inside the cylinder.

The linear compressor may include a muffler for reducing noise by forming a refrigerant passage through which the refrigerant passes, a suction pipe for guiding the refrigerant into the muffler, and a back cover for supporting the suction pipe. .

In connection with such a conventional linear compressor, the applicant has filed a patent application (hereinafter, referred to as a prior application) (Publication No. 10-2006-0081291).

In the linear compressor according to the conventional application, the fluid suctioned through the back cover 22 and the suction pipe 20 provided with the suction pipe 20 to the internal flow path 81 of the piston 30 and at the same time makes noise. A muffler 37 for reducing this is included.

In addition, the back cover 22 may be elastically supported by coupling a second spring 36 provided between the flange portion 34. In the process of driving the linear compressor, a large load may be applied to the back cover 22 by the elastic force through the second spring 36 or the vibration of the linear motor.

On the other hand, according to the prior art, the suction pipe 20 is provided to be fastened to the back cover 22 by a fastening member, or to be attached to the back cover 22 by an adhesive. In this case, the suction pipe 20 may be damaged by the load transmitted from the back cover 22 or may be separated from the back cover 22.

In addition, since the suction pipe 20 and the back cover 22 are made of different materials, for example, the suction pipe 20 is made of a light plastic material, and the back cover 22 is made of a heavy magnetic material. When the suction pipe 20 and the back cover 22 are fastened by the fastening member, the suction pipe 20 is damaged by the fastening force.

The present invention has been proposed to solve this problem, and an object thereof is to provide a linear compressor in which the back cover and the suction guide device can be firmly combined.

A linear compressor according to an embodiment of the present invention, a shell provided with a suction unit for suction of the refrigerant; A cylinder provided inside the shell; A piston reciprocating in the cylinder; A suction muffler movable together with the piston to form a refrigerant passage; A suction guide device provided at one side of the piston and configured to guide the refrigerant sucked from the suction unit to the suction muffler; And a back cover coupled to the suction guide device, wherein the back cover includes: a cover body having an insertion hole into which the suction guide device is inserted; And an indentation portion extending outwardly from the cover body and forcibly indenting at least a portion of the suction guide device.

According to the present invention, since the suction guide device can be forcibly pressed into the back cover, there is an advantage that a rigid coupling can be made between the back cover and the suction guide device.

In particular, the deformation occurs in the suction guide device according to the degree of forced indentation, so that a natural engagement between the back cover and the suction guide device can be securely coupled between the back cover and the suction guide device.

In addition, one side of the suction guide device may be supported by the stopper, and the other side may be supported by the locking part deformed in the pressing process, thereby preventing the suction guide device from being separated from the back cover.

In addition, since the back cover and the suction guide device are firmly coupled, the back cover and the suction guide device are loosened in the driving process of the linear compressor, and friction is generated between them, thereby preventing the suction guide device from being damaged. Can be.

1 is a cross-sectional view showing the internal configuration of a linear compressor according to an embodiment of the present invention.
Figure 2 is a perspective view showing the configuration of the back cover assembly according to an embodiment of the present invention.
3 is an exploded view of the back cover and the suction guide device according to an embodiment of the present invention.
4 is a view showing a state in which the back cover and the suction guide device is coupled according to an embodiment of the present invention.
5 is a cross-sectional view taken along line II ′ of FIG. 4.
FIG. 6 is an enlarged cross-sectional view of part “A” of FIG. 5.
7 is a cross-sectional view showing the relative positions of the suction muffler and the suction guide device when the piston according to the embodiment of the present invention is in the first position.
8 is a cross-sectional view showing the relative positions of the suction muffler and the suction guide device when the piston according to the embodiment of the present invention is in the second position.

Hereinafter, with reference to the drawings will be described a specific embodiment of the present invention. However, the spirit of the present invention is not limited to the embodiments presented, and those skilled in the art who understand the spirit of the present invention can easily suggest other embodiments within the scope of the same idea.

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

Referring to FIG. 1, a linear compressor 10 according to an exemplary embodiment of the present invention includes a cylinder 120 provided inside the shell 110 and a piston 130 reciprocating linearly in the cylinder 120. And a motor assembly 200 for imparting a driving force to the piston 130. The shell 110 may be configured by combining an upper shell and a lower shell. The motor assembly 200 may be referred to as a "linear motor".

The cylinder 120 may be made of a non-magnetic aluminum material (aluminum or aluminum alloy).

Since the cylinder 120 is made of an aluminum material, the magnetic flux generated by the motor assembly 200 may be transmitted to the cylinder 120 to prevent a phenomenon of leaking to the outside of the cylinder 120. In addition, the cylinder 120 may be formed by an extrusion rod processing method.

The piston 130 may be made of an aluminum material (aluminum or an aluminum alloy) that is a nonmagnetic material. Since the piston 130 is made of an aluminum material, the magnetic flux generated from the motor assembly 200 may be transmitted to the piston 130 to prevent a phenomenon of leaking to the outside of the piston 130. In addition, the piston 130 may be formed by a forging method.

In addition, the material composition ratio, that is, the type and component ratio of the cylinder 120 and the piston 130 may be the same. Since the piston 130 and the cylinder 120 are made of the same material (aluminum), the thermal expansion coefficients are the same. During operation of the linear compressor 10, the shell 100 has an environment of a high temperature (about 100 ° C.), and since the thermal expansion coefficients of the piston 130 and the cylinder 120 are the same, the piston 130 And cylinder 120 may be thermally deformed by the same amount.

As a result, the piston 130 and the cylinder 120 are thermally deformed in different sizes or directions to prevent the piston 120 from interfering with the cylinder 120 between the movements of the piston 130.

The shell 110 includes a suction part 101 through which the refrigerant flows and a discharge part 105 through which the refrigerant compressed in the cylinder 120 is discharged. The refrigerant sucked through the suction unit 101 flows into the piston 130 through the suction muffler 270. In the process of passing the refrigerant through the suction muffler 270, noise having various frequencies may be reduced.

Inside the cylinder 120, a compression space P through which the refrigerant is compressed by the piston 130 is formed. In addition, the piston 130, the suction hole (131a) for introducing the refrigerant into the compression space (P) is formed, the suction hole for selectively opening the suction hole (131a) on one side of the suction hole (131a) Valve 132 is provided.

At one side of the compression space P, discharge valve assemblies 170, 172, 174 for discharging the refrigerant compressed in the compression space P are provided. That is, the compression space P is understood as a space formed between one end of the piston 130 and the discharge valve assembly (170, 172, 174).

The discharge valve assemblies 170, 172, and 174 may include a discharge cover 172 that forms a discharge space of the refrigerant, and a discharge valve that opens when the pressure in the compression space P is equal to or greater than the discharge pressure, thereby introducing the refrigerant into the discharge space ( 170 and a valve spring 174 provided between the discharge valve 170 and the discharge cover 172 to impart an elastic force in the axial direction. Here, the “axial direction” may be understood as a direction in which the piston 130 reciprocates, that is, in a horizontal direction in FIG. 1.

The intake valve 132 may be formed on one side of the compression space P, and the discharge valve 170 may be provided on the other side of the compression space P, that is, on the opposite side of the intake valve 132.

In the process of the piston 130 reciprocating linearly inside the cylinder 120, when the pressure of the compression space (P) is lower than the discharge pressure and less than the suction pressure, the suction valve 132 is opened to cool the refrigerant Is sucked into the compression space (P). On the other hand, when the pressure of the compression space (P) is greater than the suction pressure, the refrigerant in the compression space (P) is compressed in the state in which the suction valve 132 is closed.

On the other hand, when the pressure of the compression space (P) is greater than the discharge pressure, the valve spring 174 is deformed to open the discharge valve 170, the refrigerant is discharged from the compression space (P), discharge It is discharged to the discharge space of the cover 172.

The refrigerant in the discharge space flows into the loop pipe 178 through the discharge muffler 176. The discharge muffler 176 may reduce the flow noise of the compressed refrigerant, and the loop pipe 178 guides the compressed refrigerant to the discharge unit 105. The loop pipe 178 is coupled to the discharge muffler 176 and extends flexibly, and is coupled to the discharge part 105.

The linear compressor 10 further includes a frame 110. The frame 110 is configured to fix the cylinder 120 and may be integrally formed with the cylinder 120 or fastened by a separate fastening member. In addition, the discharge cover 172 and the discharge muffler 176 may be coupled to the frame 110.

The motor stator 200 includes an outer stator 210 fixed to the frame 110 and disposed to surround the cylinder 120, and an inner stator 220 spaced apart from the inner stator 210. And a permanent magnet 230 positioned in a space between the outer stator 210 and the inner stator 220.

The permanent magnet 230 may linearly reciprocate by mutual electromagnetic force between the outer stator 210 and the inner stator 220. The permanent magnet 230 may be configured as a single magnet having one pole or a plurality of magnets having three poles are combined.

In addition, the permanent magnet 230 may be made of a relatively inexpensive ferrite material.

The permanent magnet 230 may be coupled to the piston 130 by a connection member 138. The connection member 138 may extend from one end of the piston 130 to the permanent magnet 130. As the permanent magnets 230 linearly move, the piston 130 may linearly reciprocate in the axial direction together with the permanent magnets 230.

The outer stator 210 includes coil windings 213 and 215 and a stator core 211.

The coil windings 213 and 215 include a bobbin 213 and a coil 215 wound in the circumferential direction of the bobbin 213. The cross section of the coil 215 may have a polygonal shape, for example, may have a hexagonal shape.

The stator core 211 may be formed by stacking a plurality of laminations in a circumferential direction and may be arranged to surround the coil windings 213 and 215.

When a current is applied to the motor assembly 200, a current flows in the coil 215, and a flux is formed around the coil 215 by the current flowing in the coil 215, and the magnetic flux Flows while forming a closed circuit along the outer stator 210 and the inner stator 220.

The magnetic flux flowing along the outer stator 210 and the inner stator 220 and the magnetic flux of the permanent magnet 230 may interact to generate a force for moving the permanent magnet 230.

One side of the outer stator 210 is provided with a stator cover 240. One end of the outer stator 210 may be supported by the frame 110, and the other end of the outer stator 210 may be supported by the stator cover 240. The stator cover 240 may be referred to as a “motor cover”.

The inner stator 220 is fixed to the outer circumference of the cylinder 120. In addition, the inner stator 220 is configured by stacking a plurality of laminations in the circumferential direction from the outside of the cylinder 120.

The linear compressor 10 further includes a supporter 135 supporting the piston 130 and a back cover 400 disposed in front of the supporter 135 and coupled to the stator cover 240.

The supporter 135 is coupled to the outside of the connection member 138. The back cover 400 may be disposed to cover at least a portion of the suction muffler 140.

The linear compressor 10 further includes a suction guide device 500 coupled to the back cover 400. The suction guide device 500 is understood as a device for guiding the refrigerant sucked through the suction part 101 to the suction muffler 270.

The suction guide device 500 is coupled to the back cover 400 and extends rearward, and in the reciprocating linear motion of the piston 130 and the suction muffler 270, close to or close to the suction muffler 270. And may be disposed away from the suction muffler 270 (see FIGS. 7,8).

The linear compressor 10 includes a plurality of springs 151 and 155, which are elastic members, in which natural frequencies are adjusted to allow the piston 130 to resonate.

The plurality of springs 151 and 155 may include a first spring 151 supported between the supporter 135 and the stator cover 240 and a second support between the supporter 135 and the back cover 400. A spring 155 is included. The elastic modulus of the first spring 151 and the second spring 155 may be the same.

A plurality of first springs 151 may be provided above and below the cylinder 120 or the piston 130, and the second spring 155 may be provided in front of the cylinder 120 or the piston 130. A plurality may be provided.

Here, the term “front” may be understood as a direction from the piston 130 toward the suction part 101. That is, the direction from the suction part 101 toward the discharge valve assembly 170, 172, 174 may be understood as “rear”. That is, the front (or upstream) and the rear (or downstream) may be defined based on the flow direction of the refrigerant.

In addition, the radial direction may be understood as a direction perpendicular to the front and the rear. These terms may be equally used in the following description.

A predetermined oil may be stored in the inner bottom surface of the shell 100. In addition, an oil supply device 160 for pumping oil may be provided below the shell 100. The oil supply device 160 may be operated by vibration generated as the piston 130 reciprocates linearly to pump oil upward.

The linear compressor 10 further includes an oil supply pipe 165 for guiding the flow of oil from the oil supply device 160. The oil supply pipe 165 may extend from the oil supply device 160 to a space between the cylinder 120 and the piston 130.

The oil pumped from the oil supply device 160 is supplied to the space between the cylinder 120 and the piston 130 via the oil supply pipe 165 to perform a cooling and lubricating action.

Figure 2 is a perspective view showing the configuration of the back cover assembly according to an embodiment of the present invention, Figure 3 is an exploded view of the back cover and the suction guide device according to an embodiment of the present invention, Figure 4 is according to an embodiment of the present invention The figure shows the back cover and the suction guide device combined.

2 to 4, the back cover assembly 300 according to the embodiment of the present invention includes a back cover 400 and a suction guide device 500.

The suction guide device 500 may be formed of a material in which a plastic material and a glass fiber are mixed. For example, the plastic material may include polybutylene terephtalate resin (PBT). The back cover 400 may be made of a metal material which is a magnetic material.

The back cover 400 includes a cover body 410 into which the suction guide device 500 is inserted, an extension part 412 extending rearward from both sides of the cover body 410, and the extension part 412. A coupling portion 414 extending radially outward from and coupled to the stator cover 240 is included.

The coupling part 414 has at least one fastening hole 416 through which a fastening member (not shown) fastened to the stator cover 240 is formed.

The cover body 410 is provided with a plurality of spring supporting parts 420 on which the second spring 155 is supported. The spring support 420 may protrude rearward from the cover body 410, and may have a conical shape so as to be coupled to one end of the second spring 155, for example. As described above, the second spring 155

The back cover 400 includes a press-fitting part 430 protruding forward from the cover body 410. The press-fit part 430 has a substantially hollow cylindrical shape, and forms an insertion space 432 into which the suction guide device 500 is inserted.

The suction guide device 500 includes a guide main body 501 having a substantially hollow cylindrical shape, and a refrigerant that protrudes forward from the guide main body 501 and is sucked through the suction part 101. Protruding guide 510 guided by 270 and the stopper 503 protruding by a predetermined length from the outer peripheral surface of the guide body 501 is included.

The protrusion guide 510 has a substantially hollow cylindrical shape and is disposed close to the suction part 101 to guide the refrigerant sucked through the suction part 101 to an internal space of the protrusion guide 510. . The protruding guide 510 extends from the guide body 501 toward the suction part 101 and is configured to accommodate a refrigerant.

The front part 513 defining the inflow hole 515 is coupled to the protruding guide 510. The front part 513 may extend in a radially inward direction from the rear end of the protruding guide 510 and may have a substantially disc shape. In addition, the inlet hole 515 is formed by penetrating the center region of the front portion 513 forward and backward.

The refrigerant sucked through the suction unit 101 may be guided into the inner space of the protruding guide 510, and may flow rearward toward the suction muffler 270 through the inlet hole 515. At this time, since the diameter of the inlet hole 515 is smaller than the diameter of the protruding guide 510, the flow rate of the refrigerant increases when the refrigerant flows from the inlet hole 515 to the protruding guide 510.

The stopper 503 is disposed at an approximately central portion with respect to the longitudinal direction (front and rear direction) of the guide body 501 and is formed to surround the outer circumferential surface of the guide body 501. The stopper 503 may limit the insertion distance of the suction guide device 500 when the suction guide device 500 is coupled to the back cover 400.

The suction guide device 500 may be forcibly pressed into and coupled to the back cover 400.

In detail, the suction guide device 500 includes an indentation corresponding part 520 and an indentation corresponding part 520 that are inserted into the indentation part 430 and pressed by the indentation part 430. A deformation part 525 is included to secure a deformation space in the process of being inserted into and deformed.

The distance from the center of the guide body 501 having a cylindrical shape to the deformable portion 525 may be shorter than the distance to the press-fit corresponding portion 520. Therefore, the deformable portion 525 may be understood as a portion which is not pressed by the press-fit portion 430.

The indentation counterpart 520 is formed to have a predetermined radius of curvature at the front portion of the guide body 501 to be rounded. The indentation counterpart 520 may be understood to constitute at least a part of the guide body 501. In addition, the press-fitting counterpart 520 may be spaced apart from each other.

The deformation part 525 is provided between the plurality of indentation counterparts 520 and extends linearly in a facing shape. The deformable portion 525 may be understood to be formed by linearly cutting a portion of the outer peripheral surface of the guide body 501. In addition, a plurality of deformation parts 525 may be provided, and both ends of the deformation parts 525 may be coupled to the indentation counterpart 520, respectively.

The guide body 501 further includes a locking part 522 extending forward from the press-fitting counterpart 520 and engaging on an outer side of the press-fitting part 430. The locking portion 522 may be provided at an end side of the guide body 501.

That is, the press-fitting counterpart 520 is a portion inserted into the press-fit part 430 when the suction guide device 500 is coupled to the back cover 400, and the catching part 522 is the It is understood as a portion projecting outward of the press-in portion 430.

3 and 4, the coupling action of the suction guide device 500 and the back cover 400 will be briefly described.

The suction guide device 500 moves forward from the rear of the cover body 410 so that the protruding guide 510 is inserted into the indentation part 430.

The outer diameter of the protrusion guide 510 is smaller than the inner diameter of the press-in portion 430, and thus the protrusion guide 510 passes through the press-in portion 430 to move forward of the press-in portion 430 Can be.

The outer diameter of the guide body 501 is somewhat larger than the inner diameter of the press-fit portion 430. Therefore, the guide body 501 may interfere with the indentation unit 430 in the process of being inserted into the indentation unit 430, and may be forcibly fitted (forced indentation) by applying a force of a predetermined size or more.

In detail, the indentation counterpart 520 may be deformed while passing through the indentation unit 430, that is, in a direction in which the size thereof is reduced. Secure the space for deformation.

The suction guide device 500 may move until the stopper 503 interferes with the back cover 400. If the stopper 503 interferes with the back cover 400, further insertion of the suction guide device 500 is restricted.

When coupling of the suction guide device 500 and the back cover 400 is completed, the press-fitting counterpart 520 is positioned in a deformed state inside the press-fitting part 430. In addition, the locking portion 522 may protrude to the outside of the press-fit portion 430, and may be caught at an end portion of the press-insert portion 430.

Hereinafter, the press-fit structure of the suction guide device 500 and the back cover 400 will be described in more detail.

FIG. 5 is a cross-sectional view taken along line II ′ of FIG. 4, and FIG. 6 is an enlarged cross-sectional view of part “A” of FIG. 5.

5 and 6, the guide body 501 of the suction guide device 500 according to the embodiment of the present invention is inserted into the insertion hole 405 of the back cover 400. The press-fit part 430 of the back cover 400 extends forward from the insertion hole 405.

The suction guide device 500 includes an indentation counterpart 520 which is provided inside the indentation unit 430 and pressed by the indentation unit 430. Since the press-fitting counterpart 520 is forcibly pushed into the press-fitting part 430 through the insertion hole 405, deformation may occur.

In this case, the deformation of the press-fitting counterpart 520 may be made by the deformation amount t1 in the inner radial direction of the guide body 501.

The guide main body 501 includes a locking part 522 which is formed at the front side of the press-fitting part 520 and which is caught at an end of the press-fitting part 430. The locking portion 522 is formed in a region corresponding to the thickness W1 of the front portion 513 of the outer circumferential surface of the guide body 501.

While the guide body 501 is press-fitted into the press-fitting part 430, the locking part 522 may be deformed by being pushed by the press-fitting part 430, but may be forward of the press-fitting part 430. In the moved state it may have a shape projecting in the radial direction by the restoring force.

This is because the end of the guide body 501, the hook portion 522 is formed is supported in the radial direction by the front portion 513, the strength can be formed high. On the other hand, since a part of the guide body 501 in which the press-fitting counterpart 520 is formed is supported by the thickness of the guide body 501, the strength thereof may be low.

Therefore, in the state where the guide body 501 is inserted into the press-fitting part 430, the press-fitting counterpart 520 is deformed by t1 in the inner radial direction, and the locking part 522 is in the outer radial direction. Deformation is generated as much as t2 to the engaging portion 430 is made.

The t1 is understood as the distance in which the press-fitting counterpart 520 is pressed with respect to the virtual line l1 extending the outer circumferential surface of the guide body 501. In addition, the t2 is understood as the distance from which the locking portion 522 is restored in the outer radial direction with respect to the imaginary line L1.

In addition, the stopper 503 may be caught by the interference part 435 of the cover body 410. Here, the interference part 435 may be understood as a part of the cover body 410 formed at the edge of the insertion hole 405.

In summary, the press-fitting counterpart 520 is a part of the guide main body 501 disposed between the rear surface 513a of the front part 513 and the stopper 503, and may have a front and rear length of C1. have.

According to this configuration, since the engaging portion 522 and the stopper 503 of the guide body 501 may be caught at both ends of the press-fit portion 430, the suction guide device 500 is the back cover There is an advantage that can be firmly coupled to (400).

Then, the suction guide device 500 is firmly coupled to the back cover 400, so that the suction guide device 500 is separated from the back cover 400 during the operation of the linear compressor, or the suction guide device ( 500 may be prevented from being damaged while interfering with the back cover 400.

Meanwhile, the suction guide device 500 further includes a flow guide 530 extending rearward from the inlet hole 515 toward the suction muffler 270. In the flow guide 530, a coolant flow path 535 is formed for the flow of the coolant.

Hereinafter, the flow of the refrigerant in the linear compressor will be described.

7 is a cross-sectional view illustrating a relative position of the suction muffler and the suction guide device when the piston according to the embodiment of the present invention is in the first position, and FIG. 8 illustrates the piston in the second position according to the embodiment of the present invention. When, the cross section showing the relative position of the suction muffler and the suction guide device.

In FIG. 7, the interior of the compressor 10 is shown when the piston 130 according to an embodiment of the present invention is in the first position. Here, the “first position” may be understood as a bottom dead center (BDC) of the piston 130.

When the motor assembly 200 is driven to move the permanent magnet 230 in one direction (left or front in FIG. 7), the piston 130 coupled to the permanent magnet 230 moves in the one direction. In addition, the suction muffler 270 coupled to the permanent magnet 230 also moves in the one direction.

As the permanent magnet 230 moves, the compression space P is expanded to form a pressure P1. At this time, the pressure P1 is formed lower than the suction pressure of the refrigerant. Therefore, the refrigerant may be sucked into the compression space P through the suction muffler 270 and through the open suction valve 132.

The suction muffler 270 includes a muffler main body 271 that is movably received inside the suction guide device 500, and a main body that is coupled to the muffler main body 271 and whose flow passage cross-sectional area is changed. A piston insertion portion 275 coupled to the portion 273 and the muffler body 271 and extending into the piston 130 is included.

The piston insertion part 275 includes a suction guide part 276 for guiding the refrigerant discharged from the piston insertion part 275 toward the suction hole 131a.

In detail, as the permanent magnet 230 moves forward, the suction muffler 270 is moved forward.

As the suction muffler 270 moves forward, the flow guide 530 may be drawn into the muffler main body 271. As the flow guide 530 is drawn in, the end of the flow guide 530 and the first inlet hole 274 of the body inserting portion 273 may be located at a close distance.

Therefore, since the refrigerant introduced through the flow guide 530 can be easily flowed to the main body inserting portion 330 through the first inlet hole 274, the flow path loss of the refrigerant is reduced, thereby compressing Efficiency can be improved.

In addition, the refrigerant introduced into the main body insertion part 273 may flow into the internal space of the piston insertion part 275 and be sucked into the suction hole 131a.

Meanwhile, at least some of the refrigerant discharged from the piston insertion part 275 may be stored in a storage space formed in the suction guide part 276 to prevent the refrigerant from flowing forward of the suction guide part 276. .

8 shows the inside of the compressor 10 when the piston 130 in the second position is in the second position. Here, the “second position” may be understood as a top dead center (TDC) of the piston 130.

In the state of FIG. 6, when the suction of the refrigerant into the compression space P is completed, the permanent magnet 230 moves in the other direction (rightward or rearward in FIG. 7), and thus the piston 130 and Suction muffler 270 moves rearward. In this process, the piston 130 compresses the refrigerant in the compression space P, and the first inlet hole 274 of the body inserting portion 273 is away from the flow guide 530.

When the refrigerant pressure in the compression space P is greater than or equal to the discharge pressure, the discharge valve 170 is opened, and the refrigerant flows into the internal space of the discharge muffler 176 through the open discharge valve 176. The discharge muffler 176 may reduce the flow noise of the compressed refrigerant.

The refrigerant may be introduced into the loop pipe 178 through the discharge muffler 176 and guided to the discharge unit 105.

10: linear compressor 100: shell
110: frame 115: back cover
120: cylinder 130: piston
133: flange portion 134: piston guide
135: supporter 138: connecting member
151,155: 1,2 spring 200: motor assembly
230: permanent magnet 240: stator cover
270: suction muffler 300: back cover assembly
400: back cover 410: cover body
414: coupling portion 420: spring support
430: indentation unit 435: interference unit
500: suction guide device 503: stopper
510: protrusion guide 520: indentation counterpart
522: locking portion 530: flow guide

Claims (15)

A shell provided with a suction unit for suction of the refrigerant;
A cylinder provided inside the shell;
A piston reciprocating in the cylinder;
A suction muffler movable together with the piston to form a refrigerant passage;
A suction guide device provided at one side of the piston and configured to guide the refrigerant sucked from the suction unit to the suction muffler; And
Includes a back cover coupled to the suction guide device,
In the back cover,
A cover body having an insertion hole into which the suction guide device is inserted; And
An indentation portion extending outward from the cover body and forcibly indenting at least a portion of the suction guide device;
The suction guide device,
A cylindrical guide body;
An indentation counterpart that forms at least a portion of an outer circumferential surface of the guide body and is pressed by the indentation unit; And
A linear compressor including a locking portion extending from the press-fit corresponding portion, the locking portion is engaged with the press-fit portion. delete delete The method of claim 1,
And the engaging portion protrudes from an end portion of the press-fitting portion. The method of claim 1,
The suction guide device,
And a stopper provided on an outer circumferential surface of the guide body, the stopper limiting a distance at which the guide body is inserted through the insertion hole. The method of claim 5,
The press-fit corresponding portion,
The linear compressor of the outer peripheral surface of the said guide body is formed in the area | region between the said locking part and the stopper. The method of claim 1,
About the imaginary line which extended the outer peripheral surface of the said guide main body,
The press-fitting counterpart is spaced in the inner radial direction of the guide body,
The engaging portion is a linear compressor, characterized in that extending in the outer radial direction of the guide body. The method of claim 1,
The press-fit corresponding portion is a linear compressor, characterized in that formed in a round. The method of claim 1,
The press-fitting portion is spaced apart from each other linear compressor, characterized in that a plurality is provided. The method of claim 9,
In the guide body,
And a deformation part extending linearly between the plurality of indentation counterparts and providing a space for deformation of the indentation counterpart when the indentation counterpart is pressed by the indentation part. The method of claim 1,
The suction guide device,
A protruding guide extending from the guide body in the direction of the suction part to receive the refrigerant sucked from the suction part; And
Is coupled to the protruding guide, and further includes a front portion defining an inlet hole for the refrigerant passing through the protruding guide,
The diameter of the inlet hole is a linear compressor, characterized in that smaller than the diameter of the protruding guide. The method of claim 11,
The suction guide device,
It further includes a flow guide extending from the inlet hole toward the suction muffler to form a refrigerant passage therein,
And the flow guide moves closer to or away from the suction muffler during the reciprocation of the piston and the suction muffler. The method of claim 1,
A linear motor providing power to the piston; And
A motor cover is supported on one side of the linear motor,
The back cover is coupled to the motor cover. The method of claim 13,
A supporter coupled to one side of the piston and moving together with the piston; And
And a spring coupled between the supporter and the back cover to provide a restoring force. The method of claim 1,
The suction guide device is a linear compressor, characterized in that the PBT resin and glass fibers are mixed.

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