KR20040102913A - Piston assembly of linear compressor - Google Patents

Abstract

PURPOSE: A piston assembly of a linear compressor is provided to minimize noise and vibration produced when a suction valve is opened and shut. CONSTITUTION: A piston assembly of a linear compressor comprises a first piston(142) having a first penetration passage(141) through which a fluid passes; a second piston(145) having a second penetration passage(144) through which the fluid passes; and a suction valve(146) opening and shutting the second penetration passage of the second piston. The first piston is arranged in a cylinder in an advancing and retreating state. The second piston has a sound insulation chamber(143) formed between the first piston and the second piston. The piston assembly includes a spacer arranged between the first piston and the second piston.

Description

Piston assembly of 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 (linear compressor) is a linear driving force of the linear motor is transmitted to the piston and the piston sucks and compresses the refrigerant gas 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 a refrigerant suction path is formed at one side of the inner case 10. 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 refrigerant passage 38 is provided in the driving motor 30. The formed piston 40 is connected, the intake valve 50 for opening and closing the refrigerant passage 38 is mounted on the piston 40, 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 the refrigerant is sucked from the outside is connected to the sealed container 1 so as to be located next to the refrigerant suction path 18 of the back cover 20.

The drive motor 30 includes a stator S composed of an outer core 31 formed of a cylindrical laminate and an inner core 32 of a cylindrical laminate inserted into the outer core 31 so as to have a predetermined gap therebetween. The coil 33 wound on the outer core 31, the magnet 34 removably disposed between the outer core 31 and the inner core 32, and the magnet 34 are fixed and the It is configured to include a magnet frame 36 connected to the piston 40 so that the piston 40 can be moved forward and backward when the magnet (34).

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 the buffer.

On the other hand, the suction valve 50 has a structure in which one side is fixed to the piston 40 by the fastening bolt 52 and the opening and closing portion 54 for opening and closing the refrigerant through hole 38 of the piston 40 elastically bent. When the piston 40 is reversed in the direction of the back cover 20, the opening and closing portion 54 is pushed by the refrigerant in the refrigerant passage 38 to open the refrigerant passage 38, the piston When the 40 is advanced toward the discharge valve 70, the opening and closing portion 54 closes the refrigerant passage 38 by the elastic force between the refrigerant and the discharge valve 70 and its own elastic force.

In the linear compressor as described above, when a voltage is applied to the coil 33, the driving motor 30 operates to linearly reciprocate the magnet 34, and the linear reciprocating motion of the magnet 34 is performed by the magnet frame ( It is transmitted to the piston 40 through 36 to cause the piston 40 to reciprocate linearly 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 refrigerant introduced into the sealed container 1 is the back cover 20. The refrigerant is sucked into the cylinder 58 through the refrigerant suction passage 18 of the inner core 32, the inner through hole of the inner core 32, and the refrigerant passage 38 of the piston 40, and is compressed and discharged. The discharged refrigerant gas in the high temperature and high pressure state is discharged to the outside of the sealed container 1 through a discharge tube (not shown).

However, the linear compressor according to the related art generates noise and vibration while the opening and closing portion 52 of the suction valve 50 is impacted with one surface of the piston 40 when the suction valve 50 is opened and closed. Vibration is propagated to the outside of the sealed container through the refrigerant through passage 38 of the piston 40, the refrigerant through hole of the inner core 32 and the refrigerant suction passage 18 of the back cover 20.

An object of the present invention is to provide a piston assembly of a linear compressor that minimizes the noise and vibration generated when opening and closing the valve, to solve the problems of the prior art described above.

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 a piston assembly of one embodiment of the linear compressor according to the present invention;

4 is an internal configuration diagram of another embodiment of the linear compressor according to the present invention.

<Explanation of symbols on main parts of the drawings>

100: sealed container 109: cylinder

110: cylinder block 120: back cover

130: drive motor 131: outer core

132: inner core S: stator

133: coil 134: magnet

136: magnet frame 140: piston assembly

141: first passage 142: first piston

142a: fixing portion 142b: first fastening hole

143: sound insulation room 144: second passage

145: second piston 145a: second fastening hole

146: intake valve 146a: opening and closing portion

146b: third fastening hole 149: spacer

149a: through hole 170: discharge valve

176: spring 178: valve body

190: protrusion C: compression chamber

The piston assembly of the linear compressor according to the present invention for solving the above problems is a first piston disposed to be retractable into the cylinder and formed with a first passageway through which the fluid passes; A second piston having a sound insulation chamber formed between the first piston and a second through passage through which the fluid passes; It characterized in that it comprises a valve for opening and closing the second passage of the second piston.

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

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

As shown in FIG. 2, the linear compressor according to the present exemplary embodiment includes a lower container 102 in which an airtight container 100 is open at an upper surface thereof, and an upper cover 104 covering an upper surface of the lower container 102. do.

The cylinder block 110 having the cylinder 109 is mounted on the first damper 106 mounted on one side of the lower container 102 to be buffered and supported by the inside of the hermetic container 100. The back cover 120 having the furnace 120a is mounted on the second damper 108 mounted on the other side of the lower container 102 to be bufferably supported.

In addition, a driving motor 130 is disposed between the cylinder block 110 and the back cover 120 to generate a driving force for compressing the refrigerant, and the driving motor 130 moves into the cylinder 109. Piston assembly 140 for compressing the refrigerant in the cylinder 109 is connected while advancing, the cylinder block 110 forms a compression chamber (C) between the piston assembly 140 and the compression chamber (C) The discharge valve 170 for opening and closing the cylinder 109 for the discharge of the compressed refrigerant in the is mounted.

The drive motor 130 is a stator (S) composed of an outer core 131 made of a cylindrical laminate and an inner core 132 made of a cylindrical laminate disposed to have a predetermined gap with the outer core 131. A coil 133 mounted on the outer core 131, a magnet 134 linearly reciprocated by an electromagnetic force formed in the coil 133, and between the outer core 131 and the inner core 132. The magnet frame 136 is arranged to be retractable and the magnet 134 is fixed and fixed to the piston assembly 140 at one end.

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 fastening members at one side of the piston assembly 140. .

The piston assembly 140 may include a first piston 142 and a first piston 142 having a first through-path 141 through which a fluid (gas refrigerant) passes, and which may be retracted into the cylinder 109. And a second piston 145 having a sound isolation chamber 143 formed therebetween and a second through passage 144 through which a fluid (gas refrigerant) passes, and a second through passage of the second piston 145 ( A suction member 146 for opening and closing the 144 and a fastening member for fixing the suction valve 146 to the second piston 145 and for fixing the first piston 142 and the second piston 145. 148 is configured.

The first piston 142 is formed in a cylindrical shape having a relative tolerance with the cylinder 109, and is provided with a fixing portion 142a protruding in the circumferential direction at one end so that the magnet frame 136 can be fixed. .

In addition, the first piston 142 may include a first spring 151 disposed between one surface of the fixing portion 142a and the cylinder block 110, the other surface of the fixing portion 142, and the back cover 120. Is supported by a second spring 152 disposed between the piston assembly 140 and the piston assembly 140 to be bufferably supported between the cylinder block 110 and the back cover 120.

The second piston 145 is formed in a cylindrical shape having a relative tolerance with the cylinder 109, and the second through passage 144 is formed in the fluid transfer direction.

The intake valve 146 is mounted on a surface opposite to the discharge valve 170 of the second cylinder 145 and elastically bent to a portion facing the second through passage 144 of the second piston 145. The opening and closing part 146a is provided.

One end of the fastening member 148 is engaged with one surface of the intake valve 146, sequentially passes through the intake valve 146 and the second piston 145, and the other end is the other end of the first piston 142. The fastening bolt is screwed on.

On the other hand, the discharge valve 170 is fixed to the cylinder block 110 so as to communicate with the cylinder 109, the inner discharge cover 172 and the refrigerant discharge hole 171 formed on one side, and the inner discharge cover 172 A spring 176 on the outer discharge cover 174 and the inner discharge cover 172 to open and close the cylinder 109 and the outer discharge cover 174 is disposed spaced apart from the outside and connected to the discharge pipe 180 for discharging the refrigerant on one side. It is configured to include a valve body 178 supported by the.

In addition, reference numeral 182 is a suction connection pipe connected to the sealed container 100 to suck refrigerant from the outside, and reference numeral 184 is a loop pipe having one end connected to the discharge pipe 180, and reference numeral 186. One end is connected to the roof pipe 184 and is a discharge connection pipe extending through the sealed container 100 to the outside of the sealed container 100.

3 is an enlarged cross-sectional view of a piston assembly of one embodiment of the linear compressor according to the present invention.

The first piston 142 is provided with a first fastening hole 142b having a female thread to which the fastening member 148 is screwed on a surface opposite to the second piston 145.

The sound insulation chamber 143 is formed by opposing surfaces of the first piston 142 and the second piston 145 and an inner circumferential surface of the cylinder 109 so that the first through passage 141 and the second through passage ( It is in communication with each of the 144, the flow path area is formed larger than the first through passage 141 and the second through passage 144 to function as a resonance space.

The second piston 145 is formed with a second fastening hole 145a through which the fastening member 148 penetrates at a portion other than the second through passage 143.

The suction valve 146 is formed in a disk shape of a size covering one surface of the second piston 145, made of a metal material so that the opening and closing portion 146a can be opened and closed elastically, the second fastening hole A third fastening hole 146b through which the fastening member 148 penetrates is formed at a portion opposite to the 145a.

Meanwhile, as shown in FIG. 3, the piston assembly 140 further includes a spacer 149 disposed between the first piston 142 and the second piston 145.

Here, the spacer 149 is disposed between the first piston 142 and the second piston 145 when the first piston 142 and the second piston 145 are fixed by the fastening member 148. The first piston 142 and the second piston 145 are spaced apart by a predetermined width h so that the sound insulation chamber 143 can be formed, and the first through passage 141 and the second through passage 144 are spaced apart from each other. It is preferable that the size is not blocked.

In addition, the spacer 149 is preferably made of an elastic member such as rubber or spring so that the shock applied to the second piston 145 is canceled when the suction valve 146 is opened and closed.

Meanwhile, the spacer 149 is formed with a through hole 149a through which the fastening member 148 penetrates so as to be supported by the fastening member 148.

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

First, when a voltage is applied to the coil 133, the driving motor 130 is operated to linearly reciprocate the magnet 134, the linear reciprocating motion of the magnet 134 is a piston through the magnet frame 136 Delivered to the assembly 140, the piston assembly 140 is linearly reciprocated in the cylinder 109.

On the other hand, the discharge valve 170 and the suction valve 160 is operated in accordance with the linear reciprocating motion of the piston assembly 140, the gas refrigerant introduced into the sealed container 100 is the refrigerant suction of the back cover 120 Passes through the furnace 120a, the first through passage 141 of the first piston 142, the sound insulation chamber 143, and the second through passage 144 of the second piston 145 in order. It is sucked into the compression chamber (C), is compressed by the piston assembly 140 and then discharged.

That is, the suction valve 146 is the opening and closing portion 146a when the piston assembly 140 is reversed in the direction of the back cover 20, the second passage passage 144 of the second piston 145 and the sound insulation chamber 143 and the second through passage 144 and the first through passage 141 are opened while being pushed by the gas refrigerant in the first through passage 141 of the first piston 142. Is sucked into the compression chamber (C).

In addition, the suction valve 146 is formed by the elastic refrigerant and the gas refrigerant sucked into the compression chamber C by the opening and closing part 146a when the piston assembly 140 is advanced toward the discharge valve 170. The two through passages 144 are closed, and the gas refrigerant in the compression chamber C is compressed by the piston assembly 140.

When the refrigerant pressure in the compression chamber C exceeds the elastic force of the spring 176, the discharge valve 170 pushes the cylinder 109 while the valve body 178 is pushed by a high-pressure gas refrigerant. The open, compressed high-temperature, high-pressure gas refrigerant passes through the discharge pipe 180, the loop pipe 184, and the discharge connection pipe 186 in order to be discharged to the outside of the sealed container 100.

On the other hand, during the opening and closing of the suction valve 146 and the discharge valve 170 and the compression of the gas refrigerant as described above, the opening and closing portion 146a of the intake valve 146 continuously to the second piston 145. The impact is caused to noise, but the noise caused by the impact is transmitted to the sound insulation room 143 through the second through passage 144 of the second piston 145 and then inside the sound insulation room 143. It is offset by the resonance action by the expansion space of.

On the other hand, the second piston 145 generates vibration as well as noise during the impact of the opening and closing portion 146a, but the vibration of the second piston 145 is absorbed and buffered by the spacer 149.

4 is an internal configuration diagram of another embodiment of the linear compressor according to the present invention.

In the present embodiment, a protrusion 190 spaces apart from the first piston 142 and the second piston 145 on at least one of opposing surfaces of the first piston 142 and the second piston 145. Since other configurations are the same as in the embodiment of the present invention, the same reference numerals will be used below and detailed description thereof will be omitted.

The protrusion 190 is a boss that has the same inner diameter as the first fastening hole 142b of the first piston 142 and the fastening hole 145a of the second piston 145 and protrudes by a predetermined width h. It is composed.

On the other hand, the protrusion 190 has a female screw portion formed in the inner circumference, the fastening distance of the fastening member 148 is increased, the first piston 142 and the second piston 145 is more firmly fixed.

On the other hand, the present invention is not limited to the above embodiment, and is not limited to the number of cylinders and sound insulation chambers, and of course, it is also possible to form the sound insulation chambers between a plurality of cylinders, respectively.

The piston assembly of the linear compressor according to the present invention configured as described above is fixed to be spaced apart so that the first piston and the second piston provided with a refrigerant passage therebetween to form a soundproof chamber therebetween, for opening and closing the refrigerant passage Since the valve is mounted to the second piston, there is an advantage that the impact noise of the valve and the second piston generated when opening and closing the valve is canceled in the sound insulation room.

In addition, since the valve assembly, the first piston and the second piston are fixed by one fastening member, there is an advantage in that the fixing operation is easy and the structure is simple.

In addition, further comprising a spacer disposed between the first piston and the second piston, there is an advantage that the fixing operation for fixing the first piston and the second piston spaced apart.

In addition, the spacer is made of an elastic member, there is an advantage that the vibration due to the shock of the valve and the second piston is absorbed, cushioned.

In addition, the first piston and the second piston has a projection for separating the first piston and the second piston protrudes on at least one or more of the opposing surface is simple structure for separating the first piston and the second piston and There is a low cost advantage.

Claims (4)

A first piston disposed to be retractable into the cylinder and having a first passageway through which the fluid passes; A second piston having a sound insulation chamber formed between the first piston and a second through passage through which the fluid passes; And a valve for opening and closing a second passage of the second piston. The method of claim 1, And the piston assembly of the linear compressor further comprises a spacer disposed between the first piston and the second piston. The method of claim 1, The first piston and the second piston is a piston assembly of the linear compressor, characterized in that the projection projecting the spaced apart from the first piston and the second piston on at least one of the opposite surface. The method according to any one of claims 1 to 3, And the piston assembly of the linear compressor further comprises a fastening member for fixing the valve to the second piston and for fixing the second piston and the first piston.