KR100320216B1 - Structure for reducing noise in linear compressor - Google Patents

Abstract

The present invention relates to a noise reduction structure of a linear compressor, and the present invention relates to a closed container having a suction pipe into which a refrigerant gas flows and a piston reciprocating linearly in a cylinder mounted in the sealed container and a refrigerant gas sucked into the suction pipe. Frequency suction noise generated when the refrigerant gas is sucked into the compression space of the cylinder as the piston moves linearly in a linear compressor having a muffler installed to communicate the refrigerant flow path formed in the piston with the refrigerant flow path inside the cylinder so that the gas flows into the cylinder. The low frequency suction noise generated in the process of inhaling, compressing and discharging the refrigerant gas is configured so that a reflection member reflecting the noise is installed between the muffler and the suction pipe so as to block the transmission to the cavity inside the sealed container. Blocks delivery to the internal cavity Prevent the closed container with a so as to be possible to reduce the vibration and noise of the compressor.

Description

Noise reduction structure of linear compressor {STRUCTURE FOR REDUCING NOISE IN LINEAR COMPRESSOR}

The present invention relates to a linear compressor, and more particularly to a noise reduction structure of the linear compressor to minimize the low-frequency noise generated in the intake system.

Generally, a compressor is a machine that compresses a fluid such as air or refrigerant gas. In one example of the compressor, a linear driving force of a motor is transmitted to a piston so that the piston sucks and compresses refrigerant gas while linearly reciprocating the inside of the cylinder.

FIG. 1 illustrates an example of the linear compressor. As shown in the drawing, the linear compressor has a sealed container 1 and a frame 10 formed in a predetermined shape and mounted inside the sealed container 1. And, the cylinder 20 is inserted into the cylinder insertion hole formed in the frame 10, the inner stator assembly 30 and the inner stator assembly 30 and the inner stator assembly 30 that is coupled to the frame 10 to form a motor A magnet 32 inserted into the gap between the outer stator assembly 31 and the inner stator assembly 30 and the outer stator assembly 31, and a magnet 32 inserted into the cylinder 20. It is connected to the magnet holder 33 is coupled to include a piston (40) for linear movement by receiving a linear movement of the magnet 32, the inside of the piston 40, the refrigerant gas flows through the pipe The refrigerant coolant flow path F is formed.

A discharge cover 60 formed in a cap shape is coupled to one side of the cylinder 20, and a discharge valve assembly 61 for opening and closing one side of the cylinder 20 is inserted into the discharge cover 60. At the end of the piston 40 is coupled to the suction valve 41 which is opened and closed in accordance with the suction of the gas, the lower portion of the frame 10 is equipped with an oil feeder 70 for supplying oil to the sliding parts.

And the cover 50 having a predetermined shape is coupled to one side of the frame 10, the movement of the moving mass (moving mass) including the piston 40 located on both sides of the piston 40 and moving together, respectively The first and second springs 71 and 72 are elastically supported to each other.

Reference numeral 34 is a coil assembly constituting the motor, 2 is a suction pipe.

The operation of the linear compressor as described above is as follows.

When power is applied to the linear compressor, the magnet 32 is linearly reciprocated by the operation of the motor, and the movement of the magnet 32 is transmitted to the piston 40 through the magnet holder 33, and the piston 40. The cylinder 20 is linearly reciprocated. At the same time as the linear reciprocating motion of the piston 40, the refrigerant gas introduced into the sealed container 1 by the operation of the suction valve and the discharge valve assembly is connected to the cylinder 20 through the refrigerant flow path F formed in the piston 40. The process of being sucked into the inside, compressed and discharged through the discharge valve assembly 61 and the discharge cover 60 is repeated.

Meanwhile, the refrigerant gas sucked into the cylinder 20 is in contact with the heated gas in the sealed container 1 in the process of sucking and compressing the refrigerant gas while linearly reciprocating the cylinder 40 in the cylinder 20. The gas suction guide and the noise reduction means are installed to reduce the noise generated by the operation of the suction valve 41 as well as to prevent a decrease in compression efficiency due to the increase in specific volume due to the heating.

As an example of the gas suction guide and the noise reduction means, as shown in FIG. 2, the first muffler 80 coupled to the gas flow path F side of the piston 40 and the sealed container 1. It consists of a second muffler (90) for communicating the suction pipe (2) and the first muffler (80) coupled.

The first muffler 80 extends and extends on the outer circumferential surface of the inlet pipe part 81, leaving a portion of one side of the inlet pipe part 81 having a predetermined diameter and a predetermined length and extending a predetermined length. A flange portion 82 having a resonant tube portion 82 having a predetermined length and extending to an end portion of the extension tube portion 83 inserted into the resonance tube portion 82 and an end of the resonance tube portion 82 to form an annular plate having a predetermined thickness ( 84). The end of the inlet pipe portion 81 and the end of the extension pipe portion 83 is located on the same line.

The second muffler 90 extends and extends in the guide tube portion 91 having a predetermined diameter and a predetermined length, and the extension tube portion 92 and the extension tube portion 92 having a predetermined length. It consists of a coupling surface portion 93 extending to form an annular plate at the end of.

In addition, the first muffler 80 is positioned such that the inflow pipe part 81, the resonance pipe part 82, and the extension pipe part 83 communicate with the refrigerant flow path F of the piston 40, and at the same time, the flange part 84. ) Is fixedly supported by a spring 72 that contacts one side of the piston 40 and elastically supports the movement of the piston 40. In addition, the second muffler (90) is inserted into the through-hole formed in the cover (50) of the expansion tube portion 92, the guide tube portion 91 is inserted into the extension tube portion 83 of the first muffler (80) The engaging surface portion 93 is in contact with the inner surface of the cover 50 and is fixedly supported by the spring 72.

As described above, the first muffler 80 moves together with the piston 40 as the piston 40 linearly moves. At this time, the refrigerant gas is sucked through the suction pipe 2 coupled to the hermetic container 1 to compress the space of the cylinder 20 through the second muffler 90, the first muffler 80, and the refrigerant passage F. P) is sucked into. The noise is reduced while the noise passes through the first and second mufflers 80 and 90 inside the cylinder 20.

However, in the conventional structure as described above, the low frequency noise generated at the suction system, that is, the suction port side of the piston 40 passes through the first and second mufflers 80 and 90, and the cavity inside the sealed container 1 is cavities. And the cavity mode again has a sealed container (1) to have a path for the noise to be delivered to the sound receiver. In order to reduce the low frequency suction noise, there is a method of increasing the inflation volume of the first and second mufflers 80 and 90 or increasing the resistance of the sound pressure transmission path. Increasing the resistance of the delivered path has a disadvantage in that the flow resistance of the suction refrigerant gas is increased, thereby lowering the efficiency.

An object of the present invention devised in view of the above point is to provide a noise reduction structure of a linear compressor to minimize low frequency noise caused by an intake system for sucking refrigerant gas.

1 is a cross-sectional view showing an example of a general linear compressor,

2 is a partial cross-sectional view of a linear compressor mainly showing a noise reduction structure of a conventional linear compressor;

Figure 3 is a front view showing a partially cut linear compressor with a linear compressor noise reduction structure of the present invention.

(Explanation of symbols for the main parts of the drawing)

One ; Airtight container 2; suction

20; Cylinder 40; piston

80,90; Muffler 100; Reflective member

In order to achieve the object of the present invention as described above, a closed vessel having a suction tube into which a refrigerant gas is introduced and a piston reciprocating linearly in a cylinder mounted in the sealed vessel and a refrigerant gas sucked into the suction tube into the cylinder. In a linear compressor having a muffler installed to communicate the refrigerant flow path formed in the piston and the suction pipe, the noise generated as the refrigerant gas is sucked into the compression space of the cylinder as the piston moves linearly. A noise reduction structure of a linear compressor is provided, wherein a reflection member for reflecting noise is provided between the muffler and the suction pipe so as to block the flow into the cavity.

Hereinafter, the linear compressor noise reduction structure of the present invention will be described according to the embodiment shown in the accompanying drawings.

Figure 3 shows an example of the noise reduction structure of the linear compressor of the present invention, as shown in the first, the linear compressor receives the driving force of the drive mechanism and the drive mechanism for generating a drive force inside the sealed container (1). Compressor mechanism portion for compressing the refrigerant gas, the electric mechanism portion is coupled to the frame 10 is made of a motor for generating a linear driving force, the compressor mechanism portion is coupled to the cylinder 20 and the cylinder 20 20 is inserted into the piston 40 and the discharge valve assembly 61 and the discharge cover 60 coupled to the end of the cylinder 20 is connected to the motor at the same time and is coupled to the end of the piston 40 It is configured to include a suction valve 41.

In addition, the suction tube 2 into which the refrigerant gas is sucked is coupled to one side of the sealed container 1, and the refrigerant gas sucked into the suction tube 2 into the piston 40 is compressed in the cylinder 20. A refrigerant flow path (F) is formed to guide the flow into the air inlet, and the suction valve 41 coupled to the end of the piston 40 opens and closes the refrigerant flow path (F). The cover 50 is coupled to one side of the frame 10, and the piston 40 is elastically supported by the first and second springs 71 and 72.

In addition, the cylinder 20 and the piston 40 are guided so that the refrigerant gas sucked into the suction pipe 2 between the piston 40 and the suction pipe 2 flows directly into the refrigerant flow path F of the piston 40. Mufflers 80 and 90 are installed to prevent the noise generated from the side from escaping to the outside.

The mufflers 80 and 90 are composed of a first muffler 80 and a second muffler 90 as described in the prior art. The first muffler 80 is positioned such that the inflow pipe part 81, the resonance pipe part 82, and the extension pipe part 83 communicate with the refrigerant passage F of the piston 40, and at the same time, the flange part 84 thereof. Is in contact with one side of the piston 40 and is fixedly supported by a spring 72 that elastically supports the movement of the piston 40. In addition, the second muffler 90 is inserted into the through-hole formed in the cover 50 and the guide tube 91 is inserted into the extension tube part 83 of the first muffler 80. The engagement surface portion 93 is in contact with the inner surface of the cover 50 and is fixedly supported by the spring 72. At this time, the inlet of the expansion pipe section 92 is spaced apart from the suction pipe 2 and is positioned on the same line with each other.

And a reflection member 100 for reflecting noise is installed between the expansion pipe portion 92 and the suction pipe (2) of the second muffler (90) and the reflection member 100 is formed in a plate shape having a predetermined area And is coupled to the end of the suction pipe (2). The reflective member 100 is formed to be larger than the inlet area of the expansion pipe section 92 of the second muffler 90 and is disposed to be spaced apart from the inlet of the expansion pipe section 92 by a predetermined distance.

Hereinafter, the operational effects of the linear compressor noise reduction structure of the present invention will be described.

First, when the piston 40 is linearly reciprocated inside the cylinder 20 by receiving the driving force of the motor, the piston 40 is linearly reciprocated by the operation of the suction valve 41 and the discharge valve assembly 61 at the same time. The refrigerant gas is sucked through the suction pipe 2 coupled to one side of the sealed container 1 and flows into the first muffler 80 through the expansion pipe part 92 and the guide pipe part 91 of the second muffler 90. do. The refrigerant gas introduced into the first muffler 80 passes through the extension pipe part 83, the resonance tube part 82, and the inlet pipe part 81 of the first muffler 80 to the refrigerant flow path F of the piston 40. The refrigerant gas is introduced into the compressed space P inside the cylinder 20. The refrigerant gas sucked into the cylinder compression space P is compressed and discharged through the discharge valve assembly 61. The refrigerant gas is compressed by repeating the above process.

In the above process, the refrigerant gas sucked into the suction pipe 2 is sucked into the compression space P of the cylinder 20 through the first and second mufflers 80 and 90, and thus, the heated gas inside the sealed container 1. Contact is prevented and the temperature rise of the refrigerant gas to be sucked is suppressed. In addition, the low frequency suction noise of the suction system generated during the suction of the refrigerant gas comes out through the first and second mufflers 80 and 90 and the low frequency suction noise coming out through the first and second mufflers 80 and 90. The low frequency suction noise is canceled by the reflection member 100 and canceled by the low frequency suction noise emitted through the first and second mufflers 80 and 90, thereby preventing the low frequency suction noise from being transmitted to the cavity inside the sealed container 1. To prevent excitation).

According to the present invention, the suction flow path of the refrigerant gas into which the refrigerant gas is sucked into the compression space P of the cylinder 20 is simplified, which not only prevents the suction flow path resistance from increasing, but also prevents the volume from increasing. Minimize noise.

As described above, the noise reduction structure of the linear compressor according to the present invention is a low frequency suction noise generated in the process of inhaling, compressing and discharging the refrigerant gas while the piston is linearly reciprocating in the cylinder is delivered to the inner cavity of the closed container. Blocking of the container is prevented from having the sealed container, thereby minimizing the occurrence of vibration noise during the operation of the compressor, thereby increasing the reliability of the compressor.

Claims (2)

A refrigerant container formed in the piston and a suction channel formed in the piston so that the piston reciprocating linearly in the cylinder mounted in the sealed container and the cylinder mounted in the sealed container and the refrigerant gas sucked into the cylinder are introduced into the cylinder. A linear compressor having a muffler installed to communicate with each other, the linear compressor having a muffler, in which the suction noise generated as the refrigerant gas is sucked into the compression space of the cylinder is prevented from being transferred to the cavity inside the sealed container. Noise reduction structure of the linear compressor, characterized in that the reflecting member for reflection is installed between the muffler and the suction pipe. The noise reduction structure of a linear compressor according to claim 1, wherein the reflective member is formed in a plate shape having a predetermined area and coupled to a suction pipe.