KR20040105084A - Linear compressor - Google Patents

Abstract

The present invention relates to a linear compressor having high efficiency and capable of reducing noise in various bands, comprising: a cylinder; A piston disposed to be able to move in and out of the cylinder, having a through passage formed therein so as to suck the fluid into the cylinder, and having a suction valve configured to open and close the through passage; A discharge valve for opening and closing the cylinder; A linear motor for advancing and retracting the piston; A back cover disposed to be spaced apart from the cylinder; a first silencer mounted to an end of the piston, in communication with a passage of the piston, and having a suction hole to allow fluid to be sucked; And a second silencer mounted on the back cover to vary the internal volume of the first silencer and having a suction hole communicating with the outside of the back cover so that fluid outside the back cover can be sucked. do.

Description

Linear compressor {Linear compressor}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear compressor, and more particularly, to a piston assembly of a linear compressor for attenuating and mitigating noise and vibration generated during opening and closing of a suction valve.

In general, a linear compressor is a linear driving force of the linear motor is transmitted to the piston, the piston sucks and compresses the fluid while linearly reciprocating the inside of the cylinder.

1 is an internal configuration diagram of a linear compressor according to the prior art.

In the conventional linear compressor, as shown in FIG. 1, an inner case 10 having a cylindrical shape having a predetermined length is installed inside the sealed container 1, and one side of the inner case 10 has a fluid suction path. A back cover 20 having an 18 formed thereon is coupled thereto, and a driving motor 30 generating a driving force is mounted in the inner case 10, and a fluid passage 38 is provided in the driving motor 30. The formed piston 40 is connected, the intake valve 50 for opening and closing the fluid passage 38 to the piston 40 is mounted, the piston 40 is advanced to the other side of the inner case 10 A cylinder block 60 having a cylinder portion 58 inserted therein is coupled, and a discharge valve 70 for opening and closing the cylinder portion 58 is mounted to the cylinder block 60.

A suction pipe 2 through which fluid is sucked from the outside is connected to the sealed container 1 so as to be located next to the fluid suction path 18 of the back cover 20.

The drive motor 30 is wound around the inner core 32 and the outer core 31 of the cylindrical stack inserted into the outer core 31 and the outer core 31 having a predetermined gap therebetween. The stator S composed of the coil 33, the magnet 34 removably disposed between the outer core 31 and the inner core 32, the magnet 34 are fixed, and the magnet ( 34 includes a magnet frame 36 connected to the piston 40 to allow the piston 40 to move forward and backward.

The outer core 31 is inserted into the inner case 10 and fixedly coupled to the back cover 20, and the inner core 32 is a cylindrical coupling portion 21 formed on the back cover 20. The magnet 34 is fixed to the outer circumference of the magnet frame 36 so that the magnet 34 can be disposed between the outer core 31 and the inner core 32.

The magnet frame 36 and the piston 40 are connected to the first spring 37a disposed between the cylinder block 60 and the second spring 37b disposed between the inner core 32. By elastic support.

The intake valve 50 has a structure in which one side is fixed with a fastening bolt to the piston 40 and an opening / closing part for opening and closing the fluid through hole 38 of the piston 40 is elastically bent, the piston 40 When the back cover 20 is reversed in the direction of the back cover 20, the opening and closing portion is pushed by the fluid in the fluid passageway 38 to open the fluid passageway 38, the piston 40 in the discharge valve 70 direction The opening and closing part closes the fluid passage 38 by its elastic force and the fluid between the discharge valve 70 when it is advanced.

The discharge valve 70 is mounted to the cylinder block 60 and the discharge cover 72 is connected to the discharge pipe on one side, and the discharge cover 72 is supported by a spring 74 to the The valve body 76 is arranged in close contact with the end portion and opens and closes the end portion of the cylinder portion 58.

On the other hand, the linear compressor generates noise while the opening and closing portion of the suction valve 50 impacts the piston 40 when opening and closing the suction valve 50, the valve body (opening and closing of the discharge valve 70) ( Noise is generated when 76 is impacted with the cylinder portion 58, and the noise (dotted line) is caused by the fluid through hole 38 of the piston 40 and the fluid through hole of the inner core 32 and the back cover 20. Is delivered to the outside of the sealed container (1) through the fluid intake path 18 of the), in order to prevent the noise (dotted line), a separate silencer 80 is mounted on one side of the noise transmission path.

The silencer 80 is fixedly mounted to an end portion of the piston 40 so as to be spaced apart from the fluid suction path 18 of the back cover 20, and sucked into the fluid suction path 18 of the back cover 20. A fluid through hole 82 is formed to allow fluid to be sucked into the fluid passage 38 of the piston 40, and the inside of the piston 40 is enlarged.

Looking at the operation of the linear compressor as described above is as follows.

First, when a voltage is applied to the coil 33, the drive motor 30 is operated to linearly reciprocate the magnet 34, the linear reciprocating motion of the magnet 34 is a piston through the magnet frame 36 It is transmitted to 40 so that the piston 40 linearly reciprocates in the cylinder portion 58.

While the piston 40 linearly reciprocates in the cylinder portion 41, the discharge valve 70 and the suction valve 50 are opened and closed, and the gas fluid introduced into the sealed container 1 is the back cover 20. Suction through the fluid suction passage 18 and the inner through hole of the inner core 32 and the fluid silencer 80 and the fluid passage passage 38 of the piston 40 to be compressed into the cylinder portion 58. Then discharged. The discharged high temperature and high pressure fluid gas is discharged to the outside of the sealed container 1 through a discharge tube (not shown).

However, in the linear compressor according to the related art, since the muffler 80 is spaced apart from the fluid suction path 18 of the back cover 20 and linearly reciprocates with the piston 40, the back cover 20 Fluid (solid line) sucked through the fluid suction path 18 of the cylinder 40 is difficult to be sucked into the fluid passage path 38 of the cylinder 40 through the silencer 80, and thus there is a problem that the efficiency is lowered. .

The present invention has been made to solve the above problems of the prior art, and an object thereof is to provide a linear compressor having high efficiency and capable of reducing noise in various bands.

1 is an internal configuration diagram of a linear compressor according to the prior art,

2 is an internal configuration of a linear compressor according to an embodiment of the present invention;

3 is an enlarged cross-sectional view of an internal expansion of the second silencer of the embodiment of the linear compressor according to the present invention;

Figure 4 is an enlarged cross-sectional view of the inside of the second silencer of the linear compressor according to an embodiment of the present invention;

5 is an enlarged cross-sectional view showing another embodiment of the linear compressor according to the present invention;

6 is an enlarged sectional view showing another embodiment of the linear compressor according to the present invention.

<Explanation of symbols on main parts of the drawings>

101: lower container 102: upper cover

104: airtight container 104a: suction connection pipe

104b: discharge connection pipe 106: first damper

108: second damper 109: cylinder

110: cylinder block 120: back cover

120a: opening hole 120b: communication hole

130: linear motor 131: outer core

132: inner core 133; coil

134: magnet 136: magnet frame

140: through passage 142: intake valve

144: piston 144a: first spring

144b: second spring 150: discharge valve

151: discharge hole 152: inner discharge cover

153: discharge pipe 154: outer discharge cover

156: spring 158: valve body

160: first silencer 160a: communication hole

160b: suction hole 162: expansion chamber

163: communication hole 164: Helmholtz resonator

170: second silencer 170a; Suction hole

172: fluid suction part 174: suction pipe part

180: fluid leakage prevention part C: compression chamber

t: gap

Linear compressor according to the present invention for solving the above problems is a cylinder; A piston disposed to be able to move in and out of the cylinder, having a through passage formed therein so as to suck the fluid into the cylinder, and having a suction valve configured to open and close the through passage; A discharge valve for opening and closing the cylinder; A linear motor for advancing and retracting the piston; A back cover disposed to be spaced apart from the cylinder; a first silencer mounted to an end of the piston, in communication with a passage of the piston, and having a suction hole to allow fluid to be sucked; And a second silencer mounted on the back cover to vary the internal volume of the first silencer and having a suction hole communicating with the outside of the back cover so that fluid outside the back cover can be sucked. do.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is an internal configuration diagram showing an embodiment of a linear compressor according to the present invention.

As shown in FIG. 2, the linear compressor according to the present embodiment includes a sealed container 104 including a lower container 101 and an upper cover 102, and a first damper mounted on one side of the sealed container 104. A cylinder block 110 having a cylinder 109 mounted thereon and being buffered thereon and a second damper 108 mounted on the other side of the hermetically sealed container 104 so as to be bufferably supported thereon. A back cover 120 disposed to be spaced apart from the cylinder 109 and the cylinder block 110, and a linear motor fixed to the cylinder block 110 and the back cover 120 and generating a driving force for compressing the fluid ( 130 and a passage passage 140 connected to the linear motor 130 to compress the fluid in the cylinder 109 while advancing into the cylinder 109 and allowing the fluid to be sucked into the cylinder 109. ) Is formed and a piece having a suction valve 142 for opening and closing the through passage 140 144 and a discharge valve 150 which forms a compression chamber C together with the cylinder 109 and the piston 144 and opens and closes the cylinder 109, and is mounted to an end of the piston 144. A first silencer 160 having a noise space therein and a communication hole 160a communicating with the through passage 140 of the piston 144 and a suction hole 160b formed therein, and the first silencer The suction hole 170a communicating with the outside of the back cover 120 is formed to be mounted on the back cover 120 so that the internal volume of the 160 is variable, and the fluid outside the back cover 120 can be sucked. The second silencer 170 is configured.

The hermetically sealed container 104 is connected to the suction connection pipe 104a through which the fluid is sucked to one side, and the discharge connection pipe 104b through which the compressed fluid is discharged to the other side.

The back cover 120 has an opening hole 120a in which the second silencer 170 is mounted so that the fluid in the sealed container 104 can be directly sucked into the suction hole 170a of the second silencer 170. Is formed.

Here, the opening hole 120a is formed in the same line as the center of the piston 144 and the first muffler 160, and the first muffler 160 is inserted so that the first muffler 160 is inserted. It is preferred to be formed the same size or slightly larger.

The linear motor 130 includes an outer core 131 made of a laminated body, an inner core 132 made of a laminated body arranged to have a predetermined gap with the outer core 131, and a coil mounted to the outer core 131. A stator (S) consisting of 133, the magnet 134 is advanced and retracted by the magnetic force formed around the coil 133, and the outer core 131 and the inner core 132 is disposed to be retractable The magnet 134 is mounted and consists of a mover (M) consisting of a magnet frame 136 fixed to the piston 144.

The outer core 131 is disposed between the opposite surface of the cylinder block 110 and the back cover 120 is fixedly coupled to the cylinder block 110 and the back cover 120 by a fastening means such as a fastening member, The inner core 132 is fixedly coupled to the cylinder block 110 by fastening means such as fastening members, and the magnet frame 136 is fixedly coupled to fastening means such as the piston 144 and fastening members.

The piston 144 is intermittently inserted into the cylinder 109 so that the piston 144 can be retracted into the cylinder 109, the suction valve 142 is mounted on one side of the piston 109, and the opposite side of the piston 144 is inserted into the cylinder 109. The fixing part 146 fixed by the fastening means such as the magnet frame 136 and the fastening member protrudes in the radial direction.

The piston 144 may include a first spring 144a disposed between one surface of the fixing part 146 and the cylinder block 110, and the other surface of the fixing part 146 and the back cover 120. It is elastically supported by the second spring 144b interposed therebetween, and moves forward and backward together with the mover M of the linear motor 130 and the first silencer 160.

On the other hand, the suction valve 142 is fixed to one side of the piston 144 and the portion corresponding to the fluid passage passage 140 of the piston 144 is made of a structure that is elastically bent.

The discharge valve 150 is fixed to the cylinder block 110 so as to communicate with the cylinder 109, and an inner discharge cover 152 having a fluid discharge hole 151 formed at one side thereof, and an outer side of the inner discharge cover 152. An outer discharge cover 154 disposed to be spaced apart from each other and connected to a discharge pipe 153 for discharging fluid on one side, and a spring 156 mounted on the inner discharge cover 152 to be in close contact with an end of the cylinder 109. And a valve body 158 that opens and closes the cylinder 109 while being spaced apart.

At least one of the first silencer 160 and the second silencer 170 may be made of a nonmagnetic material so that the compression efficiency of the linear compressor is not reduced.

That is, the linear motor 130 includes a coil 133 and a magnet 134 to form a strong magnetic force, and most of the components constituting the linear compressor are generally made of steel. The first silencer When both the 160 and the second silencer 170 are made of a magnetic material, the magnetic force formed in the linear motor 130 is transmitted to the second silencer 170 and the back cover 120 through the first silencer 160. Therefore, electromagnetic losses are generated, and the advancing and retracting operation of the first muffler 160 is not smooth due to the magnetic force of the first muffler 160 and the second muffler 170.

The first silencer 160 has the communication hole 160a formed at the center of the surface facing the piston 144, and the suction hole 160b at the center of the surface of the second silencer 170. Is formed, has a resonance space between the communication hole (160a) and the suction hole (160b).

The second silencer 170 has a surface facing the piston 144 is opened, the suction hole 170a is formed at the center of the opposite surface of the opening surface to have a resonance space therein, and the first silencer ( 160, the resonance space is changed to reduce the noise of various bands.

Reference numeral 200 is a loop pipe, one end of which is connected to the discharge pipe 153 and the other end of which is connected to the discharge connection pipe 104b.

3 is an enlarged cross-sectional view when the second silencer is expanded inside the linear compressor according to an embodiment of the present invention, and FIG. 4 is an enlarged cross-sectional view when the inside is reduced the second silencer according to the embodiment of the linear compressor according to the present invention.

The first silencer 160 includes at least one of an expansion chamber 162 for reducing a high frequency or a Helmholtz resonator 164 for reducing a low frequency.

The expansion chamber 162 is elongated in the longitudinal direction of the first silencer 160, and a communication hole 163 communicating with one side of the Helmholtz resonator 164 is formed.

The Helmholtz resonator 164 is formed of a hollow tube long in the fluid suction direction inside the expansion chamber 162.

The second silencer 170 is disposed in the opening hole 120a formed in the back cover 120, and at the edge of the fluid suction part 172 and the fluid suction part 172 where the suction hole 170a is formed. Consists of a fluid leakage preventing portion 180 protruding to extend to surround a portion of the outer circumference of the first muffler 160.

The fluid leakage preventing unit 180 is formed in a cylindrical shape, and a portion surrounding the outer peripheral portion of the first silencer 160 has a gap t between the outer circumference of the first silencer 160 and 0.1 mm to 1.0 mm. It is preferable.

That is, the fluid leakage preventing unit 180 maintains a gap t of 0.1 mm or more with the first muffler 170 in consideration of the assembly tolerance with the first muffler 160 or the advancing / removing operation of the first muffler 160. It is preferable to limit the gap t to 1 mm or less because the leakage of fluid is increased when the gap t is too large.

Looking at the operation of the present invention configured as described above are as follows.

First, when a voltage is applied to the coil 133 of the linear motor 130, a magnetic field is formed around the coil 133, and the magnet 134 interacts with the magnetic field around the coil 133. The retraction operation of the magnet 134 is transmitted to the piston 144 and the first muffler 160 through the magnet frame 136.

The piston 144 compresses the interior of the compression chamber C while advancing into the cylinder 109, and the first silencer 160 advances and retreats into the second silencer 170 while the second silencer ( The internal volume of the 170 is varied, and the second silencer 170 is able to block noise in various bands while the internal volume is variable.

On the other hand, the suction valve 142 and the discharge valve 150 is opened and closed operation by the pressure change by the retraction operation of the piston 144 and the first silencer 160, the fluid (solid line) is the suction connection pipe ( It is sucked into the sealed container 104 through 102b).

The fluid sucked into the sealed container 104 is sucked into the second silencer 170 through the suction hole 170a of the second silencer 170, and the fluid leakage of the second silencer 170 is prevented. It is blocked by the prevention unit 180 and is sucked into the first silencer 160 through the suction hole 160b of the first silencer 160 while preventing the leakage around the first silencer 160 as much as possible.

The fluid sucked into the first silencer 160 passes through the through hole 140 and the suction valve 142 of the communication hole 160a, the piston 144, and is sucked into the compression chamber C. After being compressed by the piston 144, the discharge valve 150, the discharge pipe 153, the loop pipe 200, and the discharge connection pipe 104b are sequentially discharged.

On the other hand, the linear compressor generates a noise (dotted line) due to the impact when opening and closing the suction valve and the discharge valve, the noise is first through the through-hole 140 and the communication hole (160a) of the piston (144). It is delivered to the interior of the muffler 160.

The noise transmitted to the inside of the first muffler 160 passes through the Helmholtz resonator 164 to block noise in the low frequency band, and to block the noise in the high frequency band by the expansion chamfer 162. Noise that is not blocked by the first muffler 160 is transmitted to the inside of the second muffler 170.

On the other hand, the noise transmitted to the second muffler 170 is blocked by the internal space of the second muffler 170, since the internal volume of the second muffler 170 is changed to block the noise of various bands Finally, the noise transmitted to the outside of the sealed container 104 through the second silencer 170 is minimized.

5 is an enlarged cross-sectional view showing another embodiment of the linear compressor according to the present invention.

As shown in FIG. 4, the linear compressor of the present embodiment protrudes in the direction of the first silencer 160 to the fluid suction part 172 of the second silencer 170 and also the direction of the first silencer 160. The suction pipe part 174 is provided to reduce the inner diameter toward the side, and the expansion chamber 162 and the Helmholtz resonator 164 of the first silencer 160 do not collide with or interfere with the suction pipe part 174. It is made of the same or similar shape as the suction pipe 174, and the configuration and operation of the other than the first silencer and the second silencer is the same as the embodiment of the present invention, the same reference numerals are used and the detailed description thereof will be omitted. .

The suction pipe part 174 is formed at the inner center of the fluid leakage preventing unit 180 to be spaced apart from the inner wall surface of the fluid leakage preventing unit 180 of the second silencer 170, It has a tubular shape to act like the Helmholtz resonator 164.

In addition, the suction pipe 174 is preferably formed in a funnel shape so that the suction of the fluid is easy.

Reference numeral 165 is a Helmholtz resonator formed to protrude into the through passage 140 of the piston 144.

6 is an enlarged sectional view showing another embodiment of the linear compressor according to the present invention.

In the linear compressor of the present embodiment, as shown in FIG. 5, the second silencer 170 is mounted inside the back cover 120, and the suction cover of the second silencer 170 is provided in the back cover 120. A communication hole 120b communicating with 170a is formed, and other configurations are the same as those of the exemplary embodiment of the present invention. Therefore, the same reference numerals are used, and detailed description thereof will be omitted.

The communication hole 120b of the back cover 120 is preferably formed to be the same size or slightly larger than the suction hole 170a of the second silencer 170, and the fluid inside the sealed container 104 is the back cover. It passes through the communication hole (120b) and the suction hole (170a) of the second silencer in order to be sucked.

On the other hand, the present invention is not limited to the above embodiment, it is also possible to apply a plurality of sets of the first silencer and the second silencer whose internal volume is changed by the first silencer is operated.

The linear compressor according to the present invention configured as described above blocks the noise of various bands while the first silencer and the first silencer block the noise transmitted and received through the interior of the piston and retract with the piston. It is configured to include a second silencer, there is an advantage that can more reliably block the noise transmitted to the outside.

The first silencer may include a suction hole through which fluid is sucked, and the second silencer may include a fluid suction part including a suction hole through which fluid is sucked, and a portion of an outer circumference of the first silencer, protruding from an edge of the fluid suction part. It is composed of a fluid leakage preventing portion extended to be cheap, it is possible to minimize the fluid leaking around the first silencer has the advantage of high efficiency.

Claims (6)

A cylinder; A piston disposed to be able to move in and out of the cylinder, having a through passage formed therein so as to suck the fluid into the cylinder, and having a suction valve configured to open and close the through passage; A discharge valve for opening and closing the cylinder; A linear motor for advancing and retracting the piston; A back cover spaced apart from the cylinder: A first silencer mounted at an end of the piston, in communication with a passage of the piston, and having a suction hole to allow fluid to be sucked; And a second silencer mounted on the back cover to vary the internal volume of the first silencer and having a suction hole communicating with the outside of the back cover so that fluid outside the back cover can be sucked. Linear compressor. The method of claim 1, At least one of the first silencer and the second silencer is a nonmagnetic material. The method of claim 1, And the first silencer comprises at least one expansion chamber or a Helmholtz resonator. The method according to claim 1 or 3, The second muffler is disposed in an opening hole formed in the back cover and includes a fluid suction part in which the suction hole is formed, and a fluid leakage preventing part extending from an edge of the fluid suction part to surround a portion of an outer circumference of the first muffler. Linear compressor, characterized in that configured. The method of claim 4, wherein And the fluid suction part includes a suction pipe part which protrudes in the direction of the first silencer and reduces an inner diameter toward the direction of the first silencer. The method of claim 4, wherein The fluid leakage preventing unit has a linear compressor, characterized in that the gap between the outer periphery of the first silencer and 0.1 ~ 1.0mm.