KR100527587B1 - Noise reducing structure of reciprocating compressor - Google Patents

Abstract

The present invention relates to a reciprocating compressor in which a piston sucks and compresses a refrigerant into a compression space while linearly reciprocating inside a cylinder, and then discharges it. In particular, the noise is prevented by preventing radial vibration of a muffler installed to reduce the flow noise of the refrigerant. It relates to a noise reduction structure of a reciprocating compressor that can increase the reduction effect.

In the noise reduction structure of the reciprocating compressor according to the present invention, a cylinder, a piston, a driving means is installed inside the shell, and a first muffler for reducing the high frequency flow noise of the refrigerant is installed at one side of the inlet pipe for introducing the refrigerant into the shell. And a cylindrical second muffler for reducing low-frequency flow noise to be connected to the first muffler so that a part of the cylindrical muffler is inserted into the piston, and a dustproof member for reducing the radial vibration of the second muffler is outside the second muffler. It is installed to be attached to the circumference.

Description

Noise Reduction Structure of Reciprocating Compressor {NOISE REDUCING STRUCTURE OF RECIPROCATING COMPRESSOR}

The present invention relates to a reciprocating compressor in which a piston sucks and compresses a refrigerant into a compression space while linearly reciprocating inside a cylinder, and then discharges it. In particular, the noise is prevented by preventing radial vibration of a muffler installed to reduce the flow noise of the refrigerant. It relates to a noise reduction structure of a reciprocating compressor that can increase the reduction effect.

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

These compressors are classified into a reciprocating compressor which compresses the refrigerant while linearly reciprocating the inside of the cylinder by forming a compression space in which the working gas is absorbed and discharged between the piston and the cylinder. And a rotary compressor for compressing the refrigerant while the roller is eccentrically rotated along the inner wall of the cylinder to form a compression space in which the working gas is sucked and discharged between the eccentrically rotating roller and the cylinder. As a scroll compressor that compresses the refrigerant while the rotating scroll rotates along the fixed scroll to form a compression space in which the working gas is absorbed and discharged between the orbiting scroll and the fixed scroll. Divided.

Recently, among the reciprocating compressors, in particular, the piston is directly connected to the reciprocating linear motion drive motor, so that there is no mechanical loss due to the motion conversion to improve the compression efficiency as well as a simple linear compressor has been developed a lot.

1 is a side cross-sectional view showing a typical reciprocating compressor, Figure 2 is a side sectional view showing a muffler structure of a reciprocating compressor according to the prior art.

A typical reciprocating compressor compresses a working fluid such as a refrigerant while the piston reciprocates linearly in a cylinder. FIG. 1 relates to a linear compressor among reciprocating compressors. And a shell (Shell: 2) provided with an outlet pipe (2b) connected thereto, a cylinder (Cylinder: 4) installed inside the shell (2), and a compression space (P) while reciprocating linear motion inside the cylinder (4). A piston (Piston: 6) for sucking and compressing the refrigerant, and being discharged to be fixed to the outside of the cylinder (4), the driving means (10) for reciprocating linear movement of the piston (6), and the compression space ( It is installed at one end of the piston (6) forming the P), the suction valve 22 for sucking the refrigerant into the compression space (P), and one end of the cylinder (4) forming the compression space (P) The refrigerant from the compressed space (P) And a discharge valve assembly 24 for ejecting.

Here, the cylinder 4 is formed in a hollow shape so that the piston 6 can reciprocate linearly therein, and one end of the discharge valve assembly 24 is installed.

Next, the piston 6 has a refrigerant passage 6a formed at the center of the piston 6 so as to allow the refrigerant flowing from the inlet pipe 2a to flow therein, and is inserted into the cylinder 4 to form a compression space P at one side. The suction valve 22 is installed to open and close the refrigerant passage 6a at one end of the compression space P, and the other end is provided by restoring springs 8a and 8b provided in the axial direction. It is elastically supported by the cylinder 4 and a separate support frame 26, respectively.

Next, the driving means 10 is installed to be fixed to the outside of the cylinder 4, a cylindrical inner stator 12 having a plurality of laminations 12a laminated in the circumferential direction, and the inner stator 12. The outer outer stater 14 and the inner stator 12 and the outer stator 14 provided with a predetermined interval on the outer side and having a plurality of laminations 14b laminated on the outer side of the coil 14a in the circumferential direction. The permanent magnet 16 is installed in the space between the (6) and at the same time is connected to the other end of the piston (6) by the mounting member (15).

At this time, the inner stator 12 and the outer stator 14 are installed to be fixed by the frame 18 on the outside of the cylinder 4, the permanent magnet 16 is the mounting member 15 and the piston ( 6) together with the reciprocating linear motion is installed.

Next, the suction valve 22 is formed in a thin plate shape so that the center portion is partially cut to open and close the refrigerant passage 6a at one end side of the piston 6, and one side is at one end of the piston 6. It is installed to be fixed by a screw on.

Next, the discharge valve assembly 24 has a discharge cover 24a installed to form a discharge space O at one end of the cylinder 4 and a discharge valve installed to open and close one end of the cylinder 4. 24b and a valve spring 24c for providing an elastic force in the axial direction between the discharge cover 24a and the discharge valve 24b.

At this time, a curved loop pipe 28 is installed between one side of the discharge cover 24a and the outlet pipe 2b to guide the compressed refrigerant to be discharged to the outside as well as the cylinder 4. The vibrations caused by the interaction of the piston 6 and the driving means 10 buffer the transmission of the entire shell 2.

In addition, an oil supply device 30 is installed at the lower side of the frame 18 to supply oil stored in the lower portion of the inner side of the shell 2 between the piston 6 and the cylinder 4. The cylinder 4 is cooled while preventing friction and wear between the cylinder and the cylinder 4.

As described above, the cylinder 4, the piston 4, the driving means 10 and the oil supply device 30 and the like are connected to each other to form an assembly, which is a support spring 29 in the shell (2) It is installed to be supported by a shock absorber such as.

In particular, the inlet pipe 2 and the piston 6 inside the muffler 40 is installed to reduce the noise of the refrigerant flow, the conventional muffler structure as shown in Figure 2 and the inlet pipe 2 and A first muffler 42 having a plurality of noise reduction chambers formed therein so as to reduce high frequency noise of the flow noise of the refrigerant, and a part of the piston 6 connected to the first muffler 42. It is installed so as to be located inside is composed of a second muffler 44 of the cylindrical shape long in the axial direction to reduce the low frequency noise of the flow noise of the refrigerant.

Therefore, the coolant flows through the inlet pipe 2 and flows along the muffler 40 to flow into the piston 6, and at the same time, the coolant passes through the muffler 40, thereby reducing the noise of the coolant. Next, the refrigerant passing through the piston 6 is introduced into the compression space P while the suction valve 22 is opened due to the pressure difference, and the refrigerant compressed in the compression space P is compressed. The discharge valve 24b is opened and discharged to the outside along the loop pipe 28 and the outlet pipe 2b.

However, the noise reduction structure of the reciprocating compressor according to the prior art simply consists of a first muffler 42 having a plurality of noise reduction chambers and a second muffler 44 having an axially long cylindrical shape. (42) is formed long in the axial direction, when the vibration occurs in the radial direction, not only the amplitude is large, but also the resonance frequency and the operation frequency of the compressor increases the possibility that the resonance is generated, thereby the noise is generated by the resonance Not only is it largely generated, and furthermore, if a large vibration is generated in the radial direction, there is a problem in that the piston 6 is damaged.

The present invention has been made to solve the above problems of the prior art, by reducing the vibration in the radial direction can not only reduce the noise and vibration caused by the resonance, but also reciprocating compressor that can prevent damage to the piston The purpose is to provide a noise reduction structure.

Noise reduction structure of the reciprocating compressor according to the present invention for solving the above problems is a shell in which the inlet and outlet pipes for the refrigerant flows in and out, the cylinder is installed in the shell, the reciprocating straight line in the cylinder A reciprocating compressor comprising a piston for releasing and compressing a refrigerant into the compression space in the axial direction while discharging, and for discharging, and a driving means for reciprocating linear movement of the piston. A first muffler having a plurality of noise reduction chambers installed in the chamber to reduce the high frequency flow noise of the refrigerant, and formed to be in communication with the first muffler to be inserted into the piston to insert a portion of the refrigerant. The long cylindrical second muffler to be reduced, and the radius of the second muffler is attached to the outer circumference of the second muffler It is made of a dustproof member for reducing directional vibration.

In the present invention, the dustproof member is preferably a coil spring wound around the outer periphery of the second muffler.

In the present invention, the dustproof member is more preferably a rubber member attached to the outer circumference of the second muffler.

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

Figure 3 is a side sectional view showing a first embodiment of the muffler structure of the reciprocating compressor according to the present invention, Figure 4 is a side sectional view showing a second embodiment of the muffler structure of the reciprocating compressor according to the present invention, Figure 5 Is a graph showing the noise generated during operation in the reciprocating compressor according to the prior art and the present invention.

The first embodiment of the muffler of the reciprocating compressor according to the present invention is also installed inside the inlet pipe 2a through which oil is supplied into the shell 2 as in the prior art. Referring to FIG. 3, the inlet pipe 2a and the inlet are connected to each other, the first muffler 52 having a plurality of noise reduction chambers formed therein so as to reduce the high frequency noise of the refrigerant, and the low frequency of the refrigerant being installed to be connected to the first muffler 52. Cylindrical second muffler 54 formed long in the axial direction to reduce noise, and installed to be wound around the outer periphery of the second muffler 54 to reduce vibration in the radial direction of the second muffler 54 Made of a coil spring 56.

In this case, reference numerals not shown will be described with reference to FIG. 1.

Here, the first muffler (52) is installed so that the inlet is connected to the inlet pipe (2a) so that the refrigerant flows, and a plurality of diaphragm (52a) to be installed therein a plurality of noise reduction rooms having different volumes. It is formed inside.

In addition, the second muffler 54 is formed in an axially long cylindrical shape to be connected to the first muffler 52 so that one end thereof is positioned on the refrigerant passage 6a inside the piston 6. .

In addition, the coil spring 56 is wound so as to be in close contact with the outer circumference of the second muffler 54, by providing a damping force to reduce the vibration generated in the radial direction in the second muffler (54) To reduce the amplitude of the two muffler (54) to serve as a dustproof member.

On the other hand, the second embodiment of the reciprocating compressor according to the present invention is also installed so that the inlet pipe (2a) and the inlet as shown in Figure 4 is a plurality of noise reduction chamber to reduce the high frequency noise of the refrigerant inside A first muffler 62 formed in the second muffler, a second muffler 64 having a cylindrical shape extending in the axial direction to reduce low frequency noise of the refrigerant, and being installed to be connected to the first muffler 62 and the second muffler ( The rubber member 66 is attached to the outer circumference of the second muffler 54 so as to reduce vibration in the radial direction of the 64.

In this case, since the first muffler 62 and the second muffler 64 have the same structure as applied in the first embodiment, description thereof is omitted, and the rubber member 66 has an outer circumference of the second muffler 62. The second muffler 64 by providing a damping force to reduce the vibration generated in the radial direction in the second muffler 64 by being configured to be attached all along the axial direction, or only a portion at a predetermined interval. It acts as a dustproof member to reduce the amplitude of).

Looking at the operation of the noise reduction structure of the reciprocating compressor according to the present invention configured as described above, as the piston (6) is reciprocated linearly in the cylinder (40) by the drive means 10 the refrigerant is introduced into the inlet pipe (2a) flows through the first muffler (52, 62) and the second muffler (54, 64) in order to reduce the flow noise of the refrigerant, and then the refrigerant passing through the piston (6) is pressure The inlet valve 22 is opened by the vehicle to be compressed into the compression space P while being compressed, and the refrigerant compressed in the compression space P is opened while the discharge valve 24b is opened. And discharged to the outside along the outflow pipe 2b.

In this case, the refrigerant passing through the first mufflers 52 and 62 passes through a plurality of noise reduction chambers configured to have different volumes, and the frequency of the relatively high noise is attenuated as the volume of the refrigerant changes. The refrigerant passing through the mufflers 54 and 64 is attenuated by a relatively low noise frequency.

By the way, one end is fixed to the first muffler (52, 62), while the other end of the refrigerant along the beam-shaped second muffler (54, 64) of the free end is generated noise and vibration, the second muffler Vibration is attenuated by the coil spring 56 or the rubber member 66 even if a large vibration occurs in the radial direction on the free ends of the 54 and 64.

At this time, even if resonance occurs due to the frequency of vibration generated in the second mufflers 54 and 64 and the operating frequency of the compressor, the amplitude is reduced in the radial direction by the coil spring 56 or the rubber member 66. Therefore, not only vibration and noise can be reduced, but also damage to the piston 6 can be prevented in advance.

As described above, since the conventional muffler structure is simply composed of only the first muffler and the second muffler, as shown in FIG. 5, when a resonance occurs in which the vibration frequency of the muffler matches the operating frequency of the compressor, the amplitude of the vibration is very high. On the other hand, since the muffler structure of the present invention is composed of the first muffler, the second muffler, and the anti-vibration member (coil spring, rubber member), even if the vibration frequency of the muffler is generated to match the operating frequency of the compressor, the amplitude of vibration is It can be seen that the amplitude of the vibration is reduced by being reduced by the dustproof member.

The noise reduction structure of the reciprocating compressor according to the present invention configured as described above includes a first muffler having a plurality of noise reduction chambers formed therein, a second cylindrical muffler connected to the first muffler, and the second muffler. Since it is made of a dustproof member attached to the outer circumference to reduce the vibration in the radial direction, even if resonance occurs, the amplitude can be reduced to reduce noise and vibration, and furthermore, to prevent damage to the piston in advance as the amplitude is reduced. There is an advantage to that.

1 is a side cross-sectional view showing a typical reciprocating compressor,

Figure 2 is a side cross-sectional view showing a muffler structure of a reciprocating compressor according to the prior art,

3 is a side sectional view showing a first embodiment of a muffler structure of a reciprocating compressor according to the present invention;

4 is a side sectional view showing a second embodiment of the muffler structure of the reciprocating compressor according to the present invention;

Figure 5 is a graph showing the noise generated during operation in the reciprocating compressor according to the prior art and the present invention.

<Explanation of symbols on main parts of the drawings>

52: first muffler 54: second muffler

56: coil spring

Claims (3)

A shell provided with an inlet pipe and an outlet pipe through which refrigerant flows in and out; A cylinder installed inside the shell, A piston for forming a compression space while reciprocating linearly inside the cylinder to inject and compress the refrigerant into the compression space in the axial direction, and then discharge the piston; In the reciprocating compressor comprising a drive means for reciprocating linear movement of the piston, A first muffler installed inside the shell of the inlet pipe and provided with a plurality of noise reduction chambers for reducing high-frequency flow noise of the refrigerant; A long cylindrical second muffler formed to communicate with the first muffler to be inserted into a portion of the piston to reduce low frequency flow noise of the refrigerant; Noise reduction structure of the reciprocating compressor, characterized in that made of a dustproof member attached to the outer periphery of the second muffler to reduce the radial vibration of the second muffler. The method of claim 1, The anti-vibration member is a noise reduction structure of a reciprocating compressor, characterized in that the coil spring wound around the outer periphery of the second muffler. The method of claim 1, The anti-vibration member is a noise reduction structure of the reciprocating compressor, characterized in that the rubber member attached to the outer circumference of the second muffler.