KR20150040029A - A linear compressor - Google Patents

Abstract

The present invention relates to a linear compressor. According to an embodiment of the present invention, the linear compressor comprises: a shell having a refrigerant suction unit; a cylinder provided inside the shell; a piston which reciprocates inside the cylinder; and a suction muffler moving with the piston wherein the suction muffler comprises: a muffler body forming a refrigerant flow channel; a body insertion unit accommodated inside the muffler body and combined on the muffler body; and a piston insertion unit combined on the muffler body, enlarged to the inside of the piston, and inserted in accordance with a shape of the body insertion unit.

Description

[0001] The present invention relates to a linear compressor,

The present invention relates to a linear compressor.

Generally, a compressor is a mechanical device that receives power from an electric motor such as an electric motor or a turbine and compresses air, refrigerant or various other operating gases to increase the pressure. The compressor is used for a household appliance such as a refrigerator and an air conditioner, It is widely used throughout.

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

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

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

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

The linear compressor may be provided with a muffler for reducing the noise by forming a refrigerant passage through which the refrigerant passes.

Regarding the conventional muffler apparatus of a linear compressor, the present applicant has filed a patent application (hereinafter referred to as a conventional application) (Publication No. 10-2006-0081291).

The linear compressor according to the conventional application includes a muffler 88 for guiding the fluid sucked into the suction pipe 71 of the back cover 72 to the fluid suction passage 81 of the piston 80 and reducing the noise .

The muffler 88 includes a muffler body 90 and a noise pipe 90 protruding toward the center of the front end of the piston 80 in the muffler body 89.

According to the conventional technology, noise can be reduced by the muffler, but the effect thereof is insignificant. In addition, since the linear compressor is applied to various products such as a refrigerator or an air conditioner, ) Of the noise source.

Further, the conventional muffler is made of a metal material. When the muffler is made of a metal material, the muffler is not easy to mold, and the assembling process is complicated. If the muffler is made of a metal material having a high heat transfer rate, a large amount of heat loss is generated through the muffler.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a linear compressor having a muffler device capable of reducing noise.

A linear compressor according to an embodiment of the present invention includes: a shell having a refrigerant suction portion; A cylinder provided inside the shell; A piston reciprocating within the cylinder; A suction muffler provided movably together with the piston, the suction muffler including: a muffler body forming a refrigerant passage; A main body insertion portion accommodated in the muffler main body and coupled to the muffler main body; And a piston insertion portion coupled to the muffler body and extending into the piston, the piston insertion portion being fitted to the shape of the body insertion portion.

Further, the muffler body includes a wall forming at least a part of an outer circumferential surface of the muffler body.

The wall also includes a first wall to which at least a portion of the body insert is coupled; And a second wall extending from the first wall, wherein at least a portion of the piston insert is coupled.

The body inserting portion is provided with a flow guide for forming a flow path of the refrigerant; And a first engagement rib provided on one side of the flow guide and being press-fitted into the first wall.

Further, the muffler body includes a stopping step formed in a stepped manner, and the main body insertion portion includes an outer extension portion extending from the flow guide to the first engagement rib and seated in the engagement protrusion.

The first coupling rib includes a first bend portion that extends roundly and is coupled to the piston insertion portion.

Further, the piston inserting portion includes a body disposed inside the piston and guiding the flow of the refrigerant; And a second engaging rib provided on one side of the main body and press-fitted into the second wall.

The second engaging rib may include a second curved portion extending roundly and coupled to the main body insertion portion.

A first bending portion provided in the main body insertion portion; And a second bend portion provided in the piston insertion portion and coupled to the rounded portion of the first bend portion.

In addition, the first bend section may include a first hill part protruding in one direction; And a first curved portion that is recessed in the other direction.

The second bend portion may include a second bend portion protruding in the other direction and coupled to the first bend portion; And a second curved part that is recessed in one direction and is coupled to the first hill part.

The piston insertion portion may include a second engagement rib coupled to an inner circumferential surface of the muffler body; And a second support portion extending outwardly of the second engagement rib and coupled to the first support portion of the muffler body.

Further, the first support portion extends outward from the rim of the muffler body.

The main body insertion portion may include a first engagement rib coupled to an inner peripheral surface of the muffler body; And a first bend portion that defines one side of the first engagement rib and is formed to be round and coupled with at least a portion of the piston insertion portion.

Further, the suction muffler is characterized by being made of a plastic material.

According to the present invention, there is an advantage that a muffler body provided to be movable in accordance with the reciprocating motion of the piston and a plurality of insertion portions coupled to the muffler body can reduce the noise generated during the flow of the refrigerant in the suction muffler .

Further, since the plurality of inserting portions are press-fitted into the muffler body, the combined state of the muffler body and the plurality of inserting portions can be firmly maintained. The muffler main body and the plurality of inserting portions are made of a plastic material so that they can be elastically deformed, so that coupling through press-fitting can be facilitated.

In addition, since the main body insertion portion is press-fitted into the muffler body and then the piston insertion portion is press-fitted into the muffler body, forces are applied to the muffler body in the inward direction and forces are applied to the insertion portions in the outward direction, Assembly of the suction muffler can be effectively performed.

Further, the main body insertion portion and the piston insertion portion each include an engaging rib which is formed to be mutually engaged, and the engaging rib can be press-fitted into the inner wall of the muffler body, so that the muffler can be firmly assembled without a separate fastening member.

The coupling ribs are each provided with a curved portion, and the rounded portions are fitted to each other, so that the main body insertion portion and the piston insertion portion are firmly engaged with each other, and the slippage between the insertion portions can be prevented.

Further, since the muffler is made of a plastic material, there is an effect that the heat loss through the muffler between the refrigerant flows can be reduced.

1 is a cross-sectional view illustrating an internal configuration of a linear compressor according to an embodiment of the present invention.
2 is an internal cross-sectional view of a linear compressor showing a suction muffler according to an embodiment of the present invention.
3 is a cross-sectional view showing a configuration of a suction muffler according to an embodiment of the present invention.
4 is an exploded perspective view of a piston inserting portion and a body inserting portion of a suction muffler according to an embodiment of the present invention.
5 is a perspective view showing a configuration of a main body insertion portion according to an embodiment of the present invention.
6 is a cross-sectional view showing a press-fit structure of a suction muffler according to an embodiment of the present invention.
7 is a cross-sectional view showing a state before the main body insertion portion is press-fitted into the muffler body according to the embodiment of the present invention.
8 is a cross-sectional view showing a state in which a body insert portion is press-fitted into a muffler body according to an embodiment of the present invention.
9 is a sectional view showing a state before press fitting of a piston inserting portion into a muffler body according to an embodiment of the present invention.
10 is a cross-sectional view showing a state in which a piston inserting portion is press-fitted into a muffler body according to an embodiment of the present invention.
11 is a cross-sectional view showing the position of the suction muffler when the piston according to the embodiment of the present invention is in the first position.
12 is a sectional view showing the position of the suction muffler when the piston according to the embodiment of the present invention is in the second position.

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.

1 is a cross-sectional view illustrating an 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 embodiment of the present invention includes a cylinder 120 provided in a shell 110, a piston 130 that reciprocates linearly in the cylinder 120, And a motor assembly 200 for applying a driving force to the piston 130. The shell 110 may be constructed by combining an upper shell and a lower shell.

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

Since the cylinder 120 is made of an aluminum material, the magnetic flux generated in the motor assembly 200 can be prevented from being transmitted to the cylinder 120 and leaking to the outside of the cylinder 120. The cylinder 120 may be formed by an extrusion rod processing method.

The piston 130 may be made of an aluminum material (aluminum or aluminum alloy) which is a non-magnetic material. Since the piston 130 is made of an aluminum material, the magnetic flux generated in the motor assembly 200 can be prevented from being transmitted to the piston 130 and leaking to the outside of the piston 130. The piston 130 may be formed by a forging method.

The material composition ratio of the cylinder 120 and the piston 130, that is, kind and composition ratio, may be the same. Since the piston 130 and the cylinder 120 are made of the same material (aluminum), the coefficients of thermal expansion become equal to each other. Since the piston 130 and the cylinder 120 have the same thermal expansion coefficient during the operation of the linear compressor 10 and the inside of the shell 100 is high temperature (about 100 ° C) And the cylinder 120 can be thermally deformed by the same amount.

As a result, it is possible to prevent the piston 130 and the cylinder 120 from being thermally deformed in different sizes or directions to cause interference with the cylinder 120 between the movement of the piston 130 and the piston 130.

The shell 110 includes a suction portion 101 through which the refrigerant flows and a discharge portion 105 through which the refrigerant compressed in the cylinder 120 is discharged. The refrigerant sucked through the suction portion 101 flows into the piston 130 through the suction muffler 300. As the refrigerant passes through the suction muffler 300, noise having various frequencies can be reduced.

A compression space P in which the refrigerant is compressed by the piston 130 is formed in the cylinder 120. A suction hole 131a for introducing the refrigerant into the compression space P is formed in the piston 130 and a suction hole 131a for selectively opening the suction hole 131a is formed at one side of the suction hole 131a. A valve 132 is provided.

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

The discharge valve assembly (170, 172, 174) is provided with a discharge cover (172) for forming a refrigerant discharge space and a discharge valve And a valve spring 174 provided between the discharge valve 170 and the discharge cover 172 to apply an elastic force in the axial direction. Here, the "axial direction" can be understood as a direction in which the piston 130 reciprocates, that is, a lateral direction in FIG.

The suction valve 132 is 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 suction valve 132.

When the pressure in the compression space P is lower than the discharge pressure and becomes lower than the suction pressure in the reciprocating linear motion of the piston 130 in the cylinder 120, the suction valve 132 is opened, Is sucked into the compression space (P). On the other hand, when the pressure in the compression space P becomes equal to or higher than the suction pressure, the refrigerant in the compression space P is compressed while the suction valve 132 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 174 is deformed to open the discharge valve 170. The refrigerant is discharged from the compression space P, And 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 can reduce the flow noise of the compressed refrigerant, and the loop pipe 178 guides the compressed refrigerant to the discharge portion 105. The loop pipe 178 is connected to the discharge muffler 176 and extends in a curved shape, 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 may be fastened by a separate fastening member. The discharge cover 172 and the discharge muffler 176 may be coupled to the frame 110.

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

The permanent magnet 230 can reciprocate linearly due to mutual electromagnetic force between the outer stator 210 and the inner stator 220. The permanent magnet 230 may be formed of a single magnet having one pole or a plurality of magnets having three poles.

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 connecting member 138. The connecting member 138 may extend from one end of the piston 130 to the permanent magnet 130. As the permanent magnet 230 linearly moves, the piston 130 can linearly reciprocate in the axial direction together with the permanent magnet 230.

The outer stator 210 includes a coil winding body 213 and a stator core 211.

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

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

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

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.

A stator cover 240 is provided at one side of the outer stator 210. One end of the outer stator 210 may be supported by the frame 110 and the other end may be supported by the stator cover 240.

The inner stator 220 is fixed to the outer circumference of the cylinder 120. The inner stator 220 is formed 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 for supporting the piston 130 and a back cover 115 coupled to the front of the supporter 135.

The supporter 135 is coupled to the outside of the connecting member 138. The back cover 115 may be disposed to cover at least a portion of the suction muffler 140.

The linear compressor 10 includes a plurality of springs 151 and 155 which are resilient members whose natural frequencies are adjusted so that the piston 130 can resonate.

The plurality of springs 151 and 155 are provided with a first spring 151 supported between the supporter 135 and the stator cover 240 and a second spring 151 supported between the supporter 135 and the back cover 115. [ A spring 155 is included. The elastic modulus of the first spring 151 and the second spring 155 may be the same.

The first spring 151 may be provided on the upper side and the lower side of the cylinder 120 or the piston 130 and the second spring 155 may be provided on the front side of the cylinder 120 or the piston 130, May be provided.

Here, the "forward" can be understood as a direction from the piston 130 toward the suction portion 101. [ That is, the direction from the suction unit 101 to the discharge valve assemblies 170, 172, and 174 may be referred to as "rearward ". That is, forward (or upstream) and rearward (or downstream) may be defined with respect to the flow direction of the refrigerant.

The radial direction can be understood as a direction perpendicular to the front and rear directions. These terms may be used equally in the following description.

A predetermined oil may be stored in the inner bottom surface of the shell 100. An oil supply device 160 for pumping oil may be provided at a lower portion of the shell 100. The oil supply device 160 is operated by the vibration generated as the piston 130 linearly reciprocates to pump the 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 through the oil supply pipe 165 to perform cooling and lubrication.

3 is a cross-sectional view illustrating a configuration of a suction muffler according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view illustrating a suction muffler according to an embodiment of the present invention. FIG. 5 is an exploded perspective view of a piston inserting portion and a body inserting portion of a suction muffler according to an embodiment of the present invention, and FIG. 5 is a perspective view showing a configuration of a body inserting portion according to an embodiment of the present invention.

2 to 5, the linear compressor 10 according to the first embodiment of the present invention includes an inlet pipe 182 located at an inner side of a shell 110 to which the suction unit 101 is coupled, A muffler guide 180 disposed to surround the inlet pipe 182 and supported inside the back cover 115 is included.

The inlet pipe 182 is provided with a pipe inlet 182a formed at a position close to the suction portion 101 and guiding the inflow of the refrigerant and a pipe body 182b extending rearward from the pipe inlet 182a. And a pipe discharge hole 182c for discharging refrigerant that has passed through the pipe body 182b.

The muffler guide 180 has a substantially cylindrical shape. In the muffler guide 180, a space portion through which the suction muffler 300 can move is formed. The muffler guide 180 may extend forward and backward to guide the main body of the suction muffler 300, that is, the muffler body 310. The muffler body 310 can be moved inside the muffler guide 180.

The linear compressor (10) includes a suction muffler (300) as a muffler device for forming a refrigerant flow path through which refrigerant flows. The suction muffler 300 is provided to be movable forward or backward together with the piston 130.

The suction muffler 300 may be made of a plastic material whose heat transfer is limited. For example, the suction muffler 300 may include polybutylene terephthalate (PBT) resin and glass fiber.

The suction muffler 300 includes a muffler main body 310 movably received in the muffler guide 180 and a main body inserting portion 310 coupled to the inside of the muffler main body 310, And a piston insertion portion 350 coupled to the muffler main body 310 and extending into the piston 130. [

The suction muffler 300 is understood as a three-stage coupling assembly in which the muffler body 310, the main body insertion portion 330, and the piston insertion portion 350 are combined. For convenience of explanation, the aforementioned "muffler body 310, main body insertion portion 330, and piston insertion portion 350" may be referred to as "first member, second member, and third member".

The muffler body 310 has a substantially cylindrical shape and is provided so as to reciprocate forward or backward from the inside of the muffler guide 180. [

The muffler body 310 is formed with a pipe through-hole 312 through which the inflow pipe 182 can pass. The inlet pipe 182 may extend into the interior of the muffler body 310 through the pipe through-hole 312.

When the muffler body 310 is moved backward, the length of the inflow pipe 182 extending into the muffler body 310 is shortened. Then, the distance between the inflow pipe 182 and the main body insertion portion 330 is increased (see FIG. 12).

On the other hand, when the muffler body 310 is moved forward, the length of the inflow pipe 182 extending into the muffler body 310 becomes long. Then, the distance between the inflow pipe 182 and the main body inserting portion 330 becomes closer (see FIG. 11).

The main body insertion portion 330 is accommodated in the muffler main body 310. The muffler body 310 includes a wall 315 to which the main body insertion portion 330 is coupled. The wall 315 constitutes at least a part of the outer peripheral surface of the cylindrical muffler body 310.

The main body insertion part 330 includes a first engagement rib 336 coupled to the wall 315. The first engaging rib 336 may be forcedly inserted into the wall 315.

In detail, the outer peripheral surface of the first engaging rib 336 is provided with a press-fitting rib 338 which is press-fitted into the wall 315. The press-fitting rib 338 is configured to protrude slightly from the outer peripheral surface of the first engaging rib 336. The diameter of the first engagement rib 336 including the press-fitting rib 338 may be equal to or slightly larger than the inner diameter of the muffler body 310.

The press-fitting ribs 338 may be provided at a plurality of spaced apart from each other. For example, the press-fitting rib 338 may be disposed on a portion of the outer peripheral surface of the first engaging rib 336 where the first crest 337a is formed. Accordingly, three protrusions 337a are formed on the basis of FIG. 5, so that three press-fitting ribs 338 can be provided.

The main body inserting portion 330 is provided with a first inlet hole 331 for introducing the refrigerant discharged from the pipe discharge hole 182c of the inlet pipe 182 and a second inlet hole 331 extending rearward from the first inlet hole 331 A second flow guide 335 extending rearward from the first flow guide 333 and an outer extension portion 335a extending radially outward from the second flow guide 335. The first flow guide 333, And a first engaging rib 336 bent rearward from the outer extending portion 335a.

The cross-sectional area of the first inflow hole 331 is formed to be larger than the cross-sectional area of the pipe discharge hole 182c of the inflow pipe 182. In the process of sucking the refrigerant, the first inflow hole 331 is slightly spaced rearward from the pipe discharge hole 182c.

The refrigerant discharged from the pipe discharge hole 182c may be diffused due to expansion of the flow cross-sectional area in the process of flowing into the first inlet hole 331. [ Accordingly, the flow resistance of the refrigerant is increased, and the flow rate of the refrigerant is instantaneously decreased, thereby reducing the noise.

The first flow guide 333 may be inclined from the first inflow hole 331 in a direction in which the flow cross-sectional area decreases toward the downstream side with respect to the flow direction of the refrigerant. Accordingly, the flow resistance of the refrigerant decreases during the passage of the refrigerant through the first flow guide 333, thereby increasing the flow rate, thereby improving the suction efficiency of the refrigerant.

The second flow guide 335 extends from the first flow guide 333 toward the piston inserting portion 350 and the flow cross sectional area of the second flow guide 335 is greater than the first flow cross- . Accordingly, the flow rate of the refrigerant accelerated through the first flow guide 335 can be maintained through the second flow guide 335.

The refrigerant passing through the second flow guide 335 is discharged through the first discharge hole 339 and flows through the first coupling rib 336 and the second coupling rib 356 of the piston insertion portion 350 And flows into the inner space.

The first engagement rib 336 extends rearward from the rim of the outer extension 335a and has a substantially circular shape. The second engaging rib 356 is coupled to the first engaging rib 336 and extends rearward and has a substantially circular shape corresponding to the shape of the first engaging rib 336.

Sectional area of the inner space of the first engaging rib 336 and the second engaging rib 356 is formed to be larger than the flow cross-sectional area of the first discharging hole 339. [ This is due to the configuration in which the outer extension portion 335a extends radially toward the outside of the first discharge hole 339. [

Accordingly, the flow velocity of the refrigerant discharged from the first discharge hole 339 decreases while flowing in the inner space of the first and second coupling ribs 336 and 356, Can be reduced.

The second engagement rib 356 is configured to be coupled to the wall 315 of the muffler body 310. The second engaging rib 356 can be forcedly press-fitted into the wall 315, like the first engaging rib 336. The portion of the wall 315 to which the first engagement rib 336 is coupled is referred to as a "first wall" and the portion to which the second engagement rib 356 is coupled may be referred to as a "second wall" There will be.

Meanwhile, the first engaging rib 336 and the second engaging rib 356 include rounded portions, respectively, and the rounded portions are configured to be coupled to each other.

Specifically, the first engagement rib 336 includes a first bend portion 337 formed to have a predetermined curvature and disposed to face the piston insertion portion 350. The first curve portion 337 defines one surface of the first engagement rib 336 and extends in a predetermined direction.

The first bend section 337 includes a first crest section 337a that protrudes in one direction and a first bend section 337b that is recessed toward the other direction. Here, the one direction may be the rear direction and the other direction may be the front direction. The first hill 337a may be referred to as a "first convex portion ", and the first curved portion 337b may be referred to as a" first concave portion ".

The length of the first crest portion 337a protruding from the outer extending portion 335a may be longer than the length of the first curved portion 337b protruding from the outer extending portion 335a.

The second engaging rib 356 includes a second curved portion 357 formed to have a predetermined curvature and arranged to face the main body inserting portion 330. The second curved portion 357 defines one side of the second engaging rib 356 and extends roundly in a predetermined direction. The curved portion of the second curved portion 357 may be coupled to the curved portion of the first curved portion 337.

The second bend section 357 includes a second hill section 357a which protrudes in one direction and a second bend section 357b which is recessed toward the other direction. Here, the one direction may be the front direction and the other direction may be the rear direction. The second hill 357a may be referred to as a "second convex portion" and the second curved portion 357b may be referred to as a "second concave portion".

The length of the second crest 357a protruding from the second crest 358 of the piston 350 is longer than the length of the second crest 357b protruded from the second crest 358, .

The first crest portion 337a of the first curve portion 337 is fitted to the second curved portion 357b of the second curve portion 357 and the second crest portion 357a of the second curve portion 357 is fitted And can be fitted to the first curved portion 337b of the first curve portion 337. [

The crests 337a and the curved portions 337b of the first curve portion 337 are fitted to the curved portions 357b and the crests 357a of the second curved portion 357 to thereby form the curved portions 357b and the curved portions 357b of the second muffler 357, It is possible to prevent the body insert portion 330 and the piston insert portion 350 from being idle during the movement process.

When the first engaging rib 336 and the second engaging rib 356 are engaged, the first and second engaging ribs 336 and 356 have a substantially cylindrical shape. The inner space formed by the first and second coupling ribs 336 and 356 provides a space for the refrigerant to flow, and the flow cross-sectional area thereof may be larger than the flow cross-sectional area of the first discharge hole 339.

The piston inserting portion 350 extends rearward in a state of being coupled to the muffler body 310.

The piston inserting portion 350 is provided with a second engaging rib 356 which is press-fitted into the wall 315 of the muffler body 310 and a second engaging rib 356 which is provided inside the second engaging rib 356, A second inlet hole 351 for introducing the refrigerant discharged from the first inlet hole 339 into the piston inserting portion 350 and a second inlet hole 352 extending rearward from the second inlet hole 351 to provide a space for flowing the refrigerant, And a sub-main body 352 are included.

The second inlet hole 351 of the piston insertion portion 350 is spaced rearward from the first outlet hole 339 of the body insert portion 330. Sectional area of the refrigerant channel (hereinafter, referred to as the body internal channel) of the space formed by the first engaging rib 336 and the second engaging rib 356 is equal to or greater than the cross sectional area of the flow path of the first discharge hole 339 or the second inlet hole 351 . The main body internal flow path is formed between the first discharge hole 339 and the second inflow hole 351.

The piston inserting portion 350 further includes a second support portion 358 extending in an outer radial direction of the second engagement rib 356 and coupled to the muffler body 310.

The muffler body 310 includes a first support portion 318 coupled to the second support portion 358. The first support portion 318 is configured to extend radially outward from the wall 315 of the muffler body 310.

The first support portion 318 and the second support portion 358 may be referred to as a "rim portion" or "wing portion" as a portion protruding from each edge of the muffler body 310 and the piston inserting portion 350 There will be. The first support portion 318 and the second support portion 358 can stably maintain the engagement state of the muffler main body 310 and the piston inserting portion 350 and prevent the slip phenomenon.

The first support portion 318 and the second support portion 358 may be interposed between the flange portion 133 of the piston 130 and the piston guide 134 in a state where the first support portion 318 and the second support portion 358 are engaged with each other.

The flange portion 133 is a portion extending outward from the end of the piston 130 and supported inside the connecting member 138, and may have a substantially disc shape.

It is to be understood that the piston guide 134 is coupled to the flange portion 133 and the connecting member 138. In other words, the piston guide 350 may be interposed between the outer surface of the flange portion 300 and the inner surface of the connecting member 138.

The piston guide 134 has a substantially disc shape and supports the flange portion 300 to reduce a load acting on the piston 130 or the flange portion 330.

The first support portion 318 and the second support portion 358 may be fixed to each other between the flange portion 133 and the piston guide 134. [ Accordingly, the muffler body 310 and the piston inserting portion 350 are supported by the piston 130 by the first and second supporting portions 318 and 358 during the reciprocating motion of the piston 130, .

The piston inserting portion 350 further includes a second exhaust hole 359 through which coolant having passed through the inserting portion main body 352 is discharged. The second inflow hole 351 forms one side end of the insertion section main body 352 and the second discharge hole 359 forms the other end of the insertion section main body 352. The refrigerant discharged from the second discharge hole 359 may be sucked into the compression space P through the suction hole 131a of the piston 130. [

The piston inserting portion 350 is provided with a suction guide portion 360 provided adjacent to the second discharge hole 359 and guiding the refrigerant discharged from the second discharge hole 359 toward the suction hole 131a ).

The suction guide portion 360 is configured to surround at least a part of the insertion portion main body 352. In detail, the suction guide portion 360 is provided with a first extending portion 362 extending radially outwardly from one side of the outer peripheral surface of the insertion portion main body 352 and a second extending portion 362 bent from the first extending portion 362 and extending rearward A second extension 364 is provided.

At least a part of the refrigerant sucked into the compression space P is introduced into the space opened rearwardly defined by the first extension part 362, the second extension part 364 and the insertion part main body 352 A storage space 365 in which the refrigerant is stored is formed.

At least a part of the refrigerant discharged from the second discharge hole 359 flows backward through the space between the piston 130 and the insertion portion main body 352 or flows toward the periphery of the second discharge hole 359 You can have a vortex flow in space. Particularly, the greater the amount of refrigerant sucked into the compression space P, the more the flow is generated, and the reverse flow or vortex of the refrigerant may lower the suction efficiency of the refrigerant.

The storage space 365 may store the flow of the refrigerant to prevent reverse flow or vortex of the refrigerant. The refrigerant stored in the storage space 365 may be sucked into the compression space P during the next refrigerant suction process after the refrigerant is sucked and then compressed and discharged.

As described above, since the suction guide unit 360 is provided at a position adjacent to the second discharge hole 359 to control the flow of the refrigerant, the suction efficiency of the refrigerant can be improved.

6 is a cross-sectional view showing a press-fit structure of a suction muffler according to an embodiment of the present invention.

6, a suction muffler 300 according to an embodiment of the present invention includes a main body inserting portion 330 accommodated in a muffler main body 310 and a main body inserting portion 330 coupled to the muffler main body 310, 310 extending in the axial direction.

The muffler body 310 includes at least a portion of the main body insertion portion 330 and a wall 315 to which at least a portion of the piston insertion portion 350 is coupled. The coupling is by forced indentation.

The first wall 315a to which the first engaging rib 336 of the main body inserting portion 330 is engaged and the second engaging rib 356 of the piston inserting portion 350 are coupled to the wall 315, And a second wall 315b coupled thereto. The second wall 315b extends rearward from the first wall 315a.

The first engaging rib 336 and the second engaging rib 356 are rounded so that the length of the first engaging rib 336 and the second engaging rib 356 along the outer peripheral surface of the first engaging rib 336 and the second engaging rib 356 Can be formed differently.

That is, the length of the first engaging rib 336 protruding from the outer extending portion 335a is formed differently along the outer circumferential surface of the first engaging rib 336. The length of the second engagement rib 356 protruding from the second support portion 358 is formed differently along the outer peripheral surface of the second engagement rib 356.

6, the length of the coupling ribs 336 coupled to the right first wall 315a of the first coupling ribs 336 is short, while the length of the coupling ribs 336 coupled to the right first wall 315a is short, The length of the coupling ribs 336 coupled to the coupling ribs 336 becomes longer. The coupling rib 336 formed to be short corresponds to the portion forming the first curved portion 337b of the first curved portion 337 and the coupling rib 336 formed to be long corresponds to the first curved portion 337, The first crest portion 337a of the first crest 337a.

The length of the coupling rib 356 coupled to the right second wall 315b of the second coupling rib 356 is long while the length of the coupling rib 356 coupled to the left second wall 315b is long The length is shortened. The coupling rib 356 formed to be long corresponds to the portion forming the second hill 357a of the second bend section 357 and the coupling rib 356 formed to be short is connected to the second bend section 357, And the second curved portion 357b of the second curved portion 357b.

On the other hand, the muffler body 310 includes a stopper 317 for defining an end of the wall 315. The engaging protrusion 317 may be recessed from the inner circumferential surface of the muffler body 310 in the outer radial direction to be stepped.

The latching jaw 317 is understood as a portion in which at least a part of the main body insertion portion 330 is seated. The outer extension portion 335a of the main body insertion portion 330 may be seated in the locking protrusion 317. [ The first engagement rib 336 may extend rearward from the engagement protrusion 317 and may be coupled to the first wall 315a.

Hereinafter, an assembling process of the suction muffler according to the embodiment of the present invention will be described.

FIG. 7 is a cross-sectional view showing a state before the main body insertion portion is press-fitted into the muffler body according to the embodiment of the present invention, FIG. 8 is a sectional view showing a state where the main body insertion portion is press-fitted into the muffler body according to the embodiment of the present invention, FIG. 9 is a cross-sectional view showing a state before press fitting of a piston inserting portion into a muffler body according to an embodiment of the present invention, and FIG. 10 is a sectional view showing a state in which a piston inserting portion is press-fitted into a muffler body according to an embodiment of the present invention.

First, referring to FIG. 7, a process of attaching the main body insertion portion 330 to the muffler main body 310 will be described.

The main body insertion part 330 is inserted into the muffler main body 310 so that the first inflow hole 331 of the main body insertion part 330 is directed to the pipe through hole 312 of the muffler main body 310 And press. The main body insertion portion 330 may be inserted until the outer extension portion 335a is engaged with the engagement protrusion 317. [

The main body insertion portion 330 may be coupled to the muffler body 310 by a method of forcibly pressing the main body insertion portion 330 into the muffler body 310. As described above, at least one press-fitting rib 338 is provided on the outer circumferential surface of the first engaging rib 336 of the main body inserting portion 330, and the first engaging rib 336 including the press-fitting rib 338, The diameter of the muffler body 310 may be equal to or less than the inner diameter of the muffler body 310.

Therefore, the muffler main body 310 or the main body insertion portion 330 may be elastically deformed in the process of press-fitting the main body insertion portion 330. Since the muffler body 310 and the main body insertion portion 330 are made of a plastic material, there is no problem that a certain degree of elastic deformation occurs.

8 shows a state in which forces are applied to each other when the main body insertion portion 330 is press-fitted into the inside of the muffler main body 310. FIG.

When the main body insertion portion 330 and the muffler main body 310 are engaged with each other, a force F1 is applied to the main body insertion portion 330 located in the main body insertion portion 330 and the muffler main body 310 The force F2 acts in the inward direction.

Particularly, in the process of press-fitting the main body insertion portion 330, the peripheral region of the muffler main body 310 coupled with the press-fitting rib 338 is deformed outward by the force F1, May have a tendency to be deformed inward by the force F2. The deformation generated during the press-fitting process between the main body insert portion 330 and the muffler main body 310 can be referred to as "primary deformation ".

Meanwhile, the force F1 and the force F2 may interact with each other to maintain a firm engagement state between the main body insertion portion 330 and the muffler main body 310.

Next, referring to FIG. 9, a process of coupling the piston inserting portion 350 to the muffler body 310 to which the body inserting portion 330 is coupled will be described.

The piston inserting portion 350 is inserted into the muffler main body 310 such that the second engaging rib 356 of the piston inserting portion 350 faces the inside of the muffler main body 310.

The piston inserting portion 350 may be inserted until the second engaging rib 356 is engaged with the first engaging rib 336. The second peak 357a of the second curve 357 of the second coupling rib 356 is connected to the first curve 337b of the first curve 337 of the first coupling rib 336, The second curved portion 357b of the second curved portion 357 of the second coupling rib 356 is coupled to the first crest 337b of the first curved portion 337 of the first coupling rib 336, As shown in FIG.

The piston inserting part 350 may be coupled to the muffler body 310 by a method of forcibly inserting the piston inserting part 350 into the muffler body 310. As described in FIG. 8, the force of F2 in the inward direction acts on the muffler body 310. As shown in FIG. The inner diameter of the muffler body 310 in a state where the main body insertion portion 310 is engaged may be formed to be equal to or slightly smaller than the outer diameter of the second engagement rib 356 of the piston insertion portion 350.

The muffler main body 310 or the piston inserting portion 350 may be elastically deformed in the process of pushing the piston inserting portion 350 into the muffler main body 310. [ Since the muffler body 310 and the piston inserting part 350 are made of a plastic material, there is no problem that a certain degree of elastic deformation occurs.

10 shows a state in which forces are applied to each other when the main body insertion portion 330 is press-fitted into the inside of the muffler main body 310.

8, a force F1 acts on the main body insertion part 330 toward the muffler main body 310 in the primary direction, and the muffler main body 310 is provided with the main body 310, The force F2 acts inward toward the inserting portion 330.

When the piston inserting portion 350 is forcibly press-fitted, a force F3 acts on the piston inserting portion 350 toward the muffler body 310 in the outward direction, and as a reaction, the muffler body 310, The force F4 acts in the inward direction.

As a result, when the suction muffler 300 is assembled, a force F3 acts on the main body insertion portion 330 and the piston insertion portion 350 toward the muffler body 310 in the outward direction, The force F4 acts inwardly toward the main body insertion portion 330 and the piston insertion portion 350 in the main body 310.

In detail, in the process of press-fitting the piston inserting portion 350, a region of the muffler main body 310 which has been deformed inward due to the force F2 in the primary deformation is transferred from the piston inserting portion 350 to the outside And is deformed in the outward direction by a force F3 acting in a direction.

In the primary deformation, a portion of the muffler main body 310 deformed outward by the force F1 may have a tendency to be deformed inward by the force F4. The deformation generated during the press-fitting process between the piston inserting portion 350 and the muffler body 310 can be referred to as "secondary deformation ".

In other words, at least a part of the muffler main body 310 is subjected to a primary deformation force in the process of inserting the main body insertion part 330 into the muffler main body 310, The force acting on the primary deformed portion of the muffler body 310 to return to its original shape acts in the process of pushing the piston inserting portion 350 into the inside of the muffler body 310. [

In addition, the force F1, F2, F3, and F4 interact to balance the muffler body 310, the main body insertion portion 310, and the piston insertion portion 350, 310, the main body insertion portion 330 and the piston insertion portion 350 can be maintained firmly.

Fig. 11 is a cross-sectional view showing the position of the suction muffler when the piston according to the embodiment of the present invention is in the first position, Fig. 12 is a cross- Fig.

11, there is shown a view of the inside of the compressor 10 when the piston 130 according to the 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 and the permanent magnet 230 moves in one direction (left direction or forward direction in FIG. 11), the piston 130 coupled to the permanent magnet 230 moves in the one direction. The suction muffler 300 coupled to the permanent magnet 230 also moves in the one direction.

As the permanent magnet 230 moves, the compression space P expands to form the pressure P1. At this time, the pressure P1 is formed to be lower than the suction pressure of the refrigerant. Accordingly, the refrigerant can be sucked into the compression space P through the suction muffler 300 and the opened suction valve 132.

Specifically, as the permanent magnet 230 moves forward, the suction muffler 300 is moved forward. The first support portion 318 of the muffler main body 310 and the second support portion 358 of the piston inserting portion 350 are engaged with each other between the flange portion 133 and the piston guide 134 So that the suction muffler 300 can receive the driving force by the piston 130.

As the suction muffler 300 moves forward, the inlet pipe 182 can be drawn into the interior of the muffler body 310 through the pipe through-hole 312. As the inlet pipe 182 is drawn in, the pipe outlet hole 182c of the inlet pipe 182 and the first inlet hole 331 of the body insert 330 may be located at a close distance.

Therefore, the refrigerant introduced through the inlet pipe 182 can easily flow into the body insert part 330 through the first inlet hole 331, so that the flow path loss of the refrigerant is reduced, The efficiency can be improved.

The refrigerant discharged from the pipe discharge hole 182c flows to the inside of the main body insertion portion 330 through the first inlet hole 331. At this time, since the diameter of the first inflow hole 331 is larger than the diameter of the pipe discharge hole 182c, the flow rate of the refrigerant is reduced and noise can be reduced in the process. For example, noise in the mid-frequency band in the range of 1 to 2.5 KHz can be reduced.

The refrigerant flowing into the body insert part 33 through the first inlet hole 331 passes through the first outlet hole 339 through the first flow guide 333 and the second flow guide 335, .

At this time, the first flow guide 333 extends rearward so that the cross-sectional area of the flow path is reduced and the flow cross-sectional area of the second flow guide 335 is smaller than that of the first flow guide 333, The flow velocity may increase during the passage through the first flow guide 333 and the second flow guide 335.

The refrigerant discharged from the first discharge hole 339 flows into the second inlet hole 351 of the piston inserting portion 350 through the main body internal passage. The main body internal flow path is understood as a refrigerant flow path between the first discharge hole 339 and the second inflow hole 351. Sectional area of the main body internal flow path is formed to be larger than the flow path cross-sectional area of the first discharge hole 339 and the second inflow hole 351.

The refrigerant is diffused in the process of flowing from the first discharge hole 339 to the internal channel of the main body, and the flow velocity is reduced, so that the noise reduction effect can be obtained. For example, it is possible to reduce the noise in the high frequency band in the range of 4 to 5 KHz.

In addition, the flow rate of the refrigerant in the course of flowing into the second inflow hole 351 from the internal flow path of the main body increases, so that the suction efficiency can be improved.

The refrigerant flowing through the second inflow hole 351 flows through the insertion portion main body 352 and is discharged from the second discharge hole 359. The discharged refrigerant can be sucked into the compression space (P) through the suction hole (131a).

At least a portion of the refrigerant discharged from the second discharge hole 359 may be stored in the storage space 365 formed in the suction guide 360 and may be prevented from leaking forward.

That is, since the storage space 365 is formed in the suction guide part 360, the refrigerant flow backward to the front of the piston 130 or the vortex generated in the vicinity of the second discharge hole 359, And may be accommodated in the storage space 365. Thus, the suction efficiency of the refrigerant can be improved.

The suction guide unit 360 functions as a Helmholtz resonator. The Helmholtz resonator is understood as an acoustic device having a small hole or a neck portion for absorbing sound by resonating air at a specific frequency.

A narrow space between the second extension portion 364 of the suction guide 360 and the inner surface of the piston 130 forms the neck portion and resonance is generated in the neck portion so that sound absorption can be performed. As a result, resonance is generated by the structure of the suction guide portion 360, and noise can be reduced. For example, noise in a low frequency band in the range of about 5 to 600 Hz can be reduced.

12, there is shown a view of the inside of the compressor 10 when the piston 130 according to the embodiment of the present invention is in the second position. Here, the "second position" can be understood as a top dead center (TDC) of the piston 130. The position of the piston shown in Fig. 2 can be understood to be the "third position" located between the bottom dead center and the top dead center.

11, when the refrigerant is sucked into the compression space P, the permanent magnet 230 moves in the other direction (rightward or rearward in FIG. 12), and the piston 130 and / The suction muffler 300 moves backward. In this process, the piston 130 compresses the refrigerant in the compression space P, and the first inlet hole 331 of the body insert 330 is away from the inlet pipe 182.

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

The refrigerant flows into the loop pipe 178 through the discharge muffler 176 and can be guided to the discharge part 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: first and second springs 200: motor assembly
230: permanent magnet 240: stator cover
300: suction muffler 310: muffler body
317: latching jaw 330: main body insertion portion
336: first coupling rib 337: first bend section
350: piston insertion portion 356: second engagement rib 357: second bend 360: suction guide portion

Claims (19)

A shell having a refrigerant suction portion;
A cylinder provided inside the shell;
A piston reciprocating within the cylinder;
And a suction muffler provided movably together with the piston,
In the suction muffler,
A muffler body forming a refrigerant passage;
A body insert portion press-fitted into the muffler body; And
And a piston insertion portion that is press-fitted into the inside of the muffler body and extends into the inside of the piston, the piston insertion portion being fitted to the shape of the body insertion portion. The method according to claim 1,
In the muffler body,
And a wall forming at least a part of an inner circumferential surface of the muffler body. 3. The method of claim 2,
In the wall,
A first wall to which at least a portion of the body insert is coupled; And
And a second wall extending from the first wall and having at least a portion of the piston insert coupled therewith. The method of claim 3,
In the main body insertion portion,
A flow guide forming a flow path of the refrigerant; And
And a first coupling rib provided on one side of the flow guide and press-fitted into the first wall. 5. The method of claim 4,
Wherein the muffler body includes a stopping step formed in a stepped manner,
In the main body insertion portion,
And an outer extension portion extending from the flow guide to the first engagement rib, the outer extension portion being seated in the engagement protrusion. 5. The method of claim 4,
In the first engagement rib,
And a first bend portion formed to have a preset curvature and arranged to face the piston insertion portion. The method of claim 3,
In the piston inserting portion,
A body disposed inside the piston to guide the flow of the refrigerant; And
And a second coupling rib provided on one side of the main body and press-fitted into the second wall. 8. The method of claim 7,
And the second engaging rib has,
And a second bend portion formed to have a preset curvature and arranged to face the main body insertion portion. The method according to claim 1,
A first curve portion provided in the body insert portion; And
And a second bend portion provided in the piston insertion portion and coupled to the curved portion of the first bend portion. 10. The method of claim 9,
In the first bend section,
A first convex portion projecting in one direction; And
And a first concave portion that is recessed in the other direction. 11. The method of claim 10,
In the second bend section,
A second convex portion protruding in the other direction and coupled to the first curved portion; And
And a second concave portion that is recessed in the one direction and is coupled to the first crest portion. The method according to claim 1,
In the piston inserting portion,
A second engagement rib coupled to an inner circumferential surface of the muffler body; And
And a second support portion extending outside the second engagement rib and coupled to the first support portion of the muffler body. 13. The method of claim 12,
And the first support portion extends outward from the rim of the muffler body. The method according to claim 1,
In the main body insertion portion,
A first engagement rib coupled to an inner circumferential surface of the muffler body; And
And a first bend portion that defines one side of the first engagement rib and is formed to have a predetermined curvature and is engaged with at least a portion of the piston insertion portion. The method according to claim 1,
In the piston inserting portion,
A second engagement rib coupled to an inner circumferential surface of the muffler body; And
And a second bend portion that defines one side of the second engagement rib and is formed to have a predetermined curvature and is engaged with at least a portion of the main body insertion portion. 5. The method of claim 4,
And a press-fitting rib provided so as to protrude from an outer circumferential surface of the first engaging rib and press-fitted into the wall. 17. The method of claim 16,
And the plurality of press-fit ribs are spaced apart from each other. The method according to claim 1,
Wherein the suction muffler is made of a plastic material. A shell having a refrigerant suction portion;
A cylinder provided inside the shell;
A piston reciprocating within the cylinder;
And a suction muffler provided movably together with the piston,
In the suction muffler,
In the suction muffler,
A muffler body forming a refrigerant passage;
A body insert portion press-fitted into the muffler body; And
A piston insertion portion which is press-fitted into the inside of the muffler body and extends into the inside of the piston,
A force that primarily deforms at least a part of the muffler body is applied in a process of press-fitting the main body insert portion into the muffler main body,
Wherein a force to return to the original shape acts on the primary deformed portion of the muffler body in the process of press-fitting the piston inserting portion into the muffler body.

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