KR100746429B1 - Noise destructure for linear compressor - Google Patents

Abstract

A noise reducing structure for a linear compressor is provided to make a muffler assembly pass through a hole of a main body cover partially even in spite of axial reciprocation of the muffler assembly in association with a moving element, thereby forming a noise chamber of a relatively large diameter for increasing noise reducing effect. A noise reducing structure for a linear compressor includes a discharge structure formed of a fixed element(62), a moving element(64) and a linear motor(70) for inhaling, compressing and discharging refrigerant. A main body cover(100) is assembled into the structure with a distance therefrom in the axial direction for elastically supporting the moving element by a plurality of springs(S1,S2) in the axial direction. A muffler assembly(110) is fixed to the moving element and partially passes through a hole(100h) formed in the center of the main body cover in association with reciprocation of the moving element, so that the inhaled refrigerant passes through the muffler assembly and noise of the refrigerant is reduced during the passing.

Description

Noise reduction structure of linear compressor {NOISE DESTRUCTURE FOR LINEAR COMPRESSOR}

1 is a side cross-sectional view showing a noise reduction structure of a linear compressor according to the prior art;

Figure 2 is an exploded perspective view showing the muffler assembly installation structure of Figure 1,

3 is a side cross-sectional view showing a noise reduction structure of the linear compressor according to the present invention;

4 is an exploded perspective view illustrating the muffler assembly installation structure of FIG. 3;

5 is a graph illustrating a noise reduction amount according to an operating frequency in a conventional linear compressor and a linear compressor of the present invention.

<Explanation of symbols on main parts of the drawings>

62: fixed member 64: movable member

66: suction valve 68: discharge valve assembly

70: linear motor 80: supporter

90: motor cover 100: main body cover

100h: hole 110: muffler assembly

The present invention relates to a noise reduction structure of a linear compressor including a muffler assembly in which noise is reduced as the refrigerant flows before being introduced into the movable member. In particular, the internal noise and the installation structure of the muffler assembly are changed to reduce the flow noise of the refrigerant. And a noise reduction structure of a linear compressor that can prevent collision with other components.

1 is a side cross-sectional view showing a noise reduction structure of a linear compressor according to the prior art, Figure 2 is an exploded perspective view showing the muffler assembly installation structure of FIG.

The linear compressor according to the prior art is connected to the inlet pipe (not shown) and the outlet pipe (not shown) in which the refrigerant flows in and out of the shell as shown in FIG. 1, and is fixed to the inside of the shell. 2), the structure consisting of the movable member 4 and the linear motor 10 is installed, by the linear motor 10 in the state where one end of the movable member 4 is inserted into the fixing member (2) While driving, the refrigerant is compressed and discharged.

In addition, the supporter 20 extended in the radial direction at the other end of the movable member 4 is provided with various main springs (S1, S2) in the axial direction between the motor cover 30 and the main body cover (40). In addition, the muffler assembly 50 connected to the movable member 4 is installed to be located inside the main body cover 40 to reduce the flow noise of the refrigerant.

Here, the fixing member 2 is installed so that one end is fixed in a state penetrated through the main body frame 3, one end of the movable member 4 is inserted in the inner side to form a compression space (P), Refrigerant flows in and out of both sides of the compression space P, respectively.

At this time, the suction hole (4h) is formed so that the refrigerant can be supplied to the compression space (P) at one end of the movable member (4) and at the same time a thin suction valve to open and close the suction hole (4h) (6) is fixedly installed.

In addition, one end of the fixing member 2 is provided with a discharge valve assembly 8 for controlling the discharge of the refrigerant compressed in the compression space (P), the discharge valve assembly 8 is the fixing member (2) The discharge valve 8a which blocks one end of the discharge valve 8a is installed to be elastically supported by the spiral discharge valve spring 8c inside the discharge cap 8b fixed to one end of the fixing member 2 so as to be openable and openable.

Next, the linear motor 10 includes a cylindrical inner stator 12 configured to stack a plurality of laminations in a circumferential direction, and a plurality of laminations having a predetermined interval in the circumferential direction on a coil winding body in which the coil is wound in the circumferential direction. Cylindrical outer stator 14 provided with a pair of stacked core blocks and the inner stator 12 and the outer stator 14 are installed to be connected to the movable member 4 to reciprocate linear motion by mutual electromagnetic force. It is made of a permanent magnet (16).

At this time, the inner stator 12 is installed so that the other end is fixed to the outer peripheral surface of the fixing member 2 by a fixing ring (not shown) in a state where one end is supported by the main frame 3, and the outer stator 14 ) Is positioned on the outer circumferential surface of the inner stator 2 at a predetermined interval so that the other end is supported by the motor cover 30 while one end is also supported by the main frame 3 and the motor cover 30 is Bolted to the body frame (3), the permanent magnet 16 is axially movable between the inner stator 12 and the outer stator (14) and the other end of the movable member (4) and It is installed to be connected.

Next, the supporter 20 is installed on the other end of the movable member 4 so as to extend in the radial direction, and various support ends are formed to support various main springs S1 and S2 around the supporter 20. .

At this time, the main springs (S1, S2) are elastically supported on both sides in the axial direction with respect to the supporter 20, the supporter 20 is elastically supported by the motor cover 30 and the opposite direction Is elastically supported in the main body cover 40 which is spaced apart at a predetermined interval.

Of course, the motor cover 30 is fixed by the fastening means to the body frame 3, as mentioned above, the body cover 40 is also fixed to the motor cover 30 by the fastening means The supporter 20 is axially movable to the main body cover 40 by fastening means such as a bolt B and a nut N.

Specifically, the body cover 40 is formed so that the flat plate is bent in a 'c' shape as shown in Figure 2, the mounting portion 42 to reduce the noise of the suction refrigerant in the cylindrical shape protruding in the axial direction at the center thereof And an inflow hole 42h through which the refrigerant can be introduced, and fixing portions 44 screw-assembled to the motor cover 30 are formed at both ends of the bent portion.

At this time, the fixing part 44 is formed integrally with the main body cover 40, the mounting part 42 is manufactured separately and fixed to a hole formed in the center of the main body cover 40 by screws or the like separately, Since the mounting portion 42 is installed to protrude from the main body cover 40, the main body cover 40 and the mounting portion 42 are installed to maintain a predetermined distance so as not to collide with the shell even when vibration is generated.

Of course, the mounting part 42 resonates the noise of the suction refrigerant, and the muffler assembly 50 is installed to be partially inserted so that the refrigerant introduced through the inlet hole 42h is noisy in the mounting part 42. After being reduced, it is introduced into the muffler assembly 50.

Next, the muffler assembly 50 is installed so that the sound pipe 54 and the suction resonance unit 56 communicate with each other around the resonance unit 52 having the largest diameter.

Specifically, the resonance portion 52 is formed in a cylindrical shape formed inside the space in which the suction refrigerant flows, the radially connected to one end of the plate-shaped connecting portion 52a screwed to the movable member 4 ) Is formed, and the sound pipe 54 is formed to be axially elongated on one side of the connection portion 52a so as to communicate with the resonance portion 52 so as to be inserted into the movable member 4, and the suction resonance portion 56 is installed in a direction opposite to the sound pipe 56 so as to communicate with the resonance portion 52 is installed to be partially inserted into the mounting portion 42.

At this time, the resonator 52, the suction resonator 56, the sound pipe 54 is formed in smaller diameter in order, the refrigerant is introduced into the resonator 52 and the suction resonator (56) Holes (not shown) having a diameter smaller than the diameter are respectively formed in the direction so that refrigerant may flow through the holes.

Of course, even if the muffler assembly 50 moves reciprocally linearly with the movable member 4, the resonance portion 52 hits the mounting portion 42, or the sound pipe 54 is movable. It is designed in consideration of its axial length so as not to hit the member 4.

Therefore, the refrigerant introduced through the inlet pipe of the shell passes through the mounting unit 42 through the inlet hole 42h of the mounting unit, and then the suction resonance unit 56, the resonance unit 52, and the noise tube 54. As the refrigerant rapidly expands / collapses through), the refrigerant flows into the compression space P through the suction hole 4h of the movable member.

At this time, the noise is generated while the refrigerant is introduced into the compression space (P), the noise of the refrigerant is again the noise tube 54, the resonance unit 52 and the suction resonance unit 56, the mounting portion 42 It is reduced while passing, thereby preventing noise from being transmitted to the outside.

However, the linear compressor according to the prior art may be operated in a high cooling power mode or a low cooling power mode to cope with various loads according to each load, but the stroke length of the movable member 4 is higher in the high cooling power mode than in the low cooling power mode. Since the muffler assembly 50 reciprocates linearly together with the movable member 4 since the length becomes longer, the muffler assembly 50 reciprocates only inside the mounting portion 42 so that the muffler assembly 50 does not interfere with the mounting portion 42. The installation space must be secured in order to linearly move, and as a result, the size of the product increases.

In addition, the linear compressor according to the prior art is to reduce the noise of the suction refrigerant while passing through the mounting portion 42 and the muffler assembly 50 of the main body cover, by separately manufacturing the mounting portion 42 to the main body cover 40 Attached to a hole formed in the center, and the muffler assembly 50 is located inside the mounting portion 42, there is a problem that the manufacturing process and assembly process is complicated.

The present invention has been made to solve the above problems of the prior art, even if the muffler assembly with the movable member reciprocating linear movement so that the stroke length is variable, not only does not collide with other components but also can increase the noise reduction effect more The purpose is to provide a noise reduction structure of the linear compressor.

The noise reduction structure of the linear compressor according to the present invention for solving the above problems consists of a fixed member, a movable member and a linear motor to suck and compress the refrigerant, and then discharge the assembly, and assembled to be spaced apart from the structure in the axial direction. And suction a body cover for elastically supporting the movable member in the axial direction by a plurality of springs, and a portion thereof to pass through a hole formed in the center of the body cover as reciprocating linear movement fixed to the movable member. It consists of a muffler assembly that reduces noise as the refrigerant passes.

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

3 is a side cross-sectional view showing a noise reduction structure of the linear compressor according to the present invention, Figure 4 is an exploded perspective view showing the muffler assembly installation structure of FIG.

3 and 4, the linear compressor according to the present invention is installed in a shell (not shown) in which a structure composed of the fixing member 62, the movable member 64, and the linear motor 70 is an enclosed space. One end of the movable member 64 is inserted into the fixing member 62 and another end of the movable member 64 is connected to the supporter 80 to between the motor cover 90 and the main body cover 100. It is elastically supported by the main springs (S1, S2) in the axial direction to the reciprocating linear motion, the other end of the movable member 64 is also installed so that the muffler assembly 110 reciprocally linearly integrally to reduce the noise However, the main body cover 100 has a hole 100h formed at the center thereof so that the muffler assembly 110 may pass through the reciprocating linear motion so as not to interfere.

Of course, the shell is connected to the inlet pipe (not shown) and the outlet pipe (not shown) through which the refrigerant flows in and out, and one end of the movable member 64 is inserted into the fixing member 62 inside the shell. As the linear motor 70 reciprocates linearly, the refrigerant is sucked into the compression space P between the fixed member 62 and the movable member 64, compressed, and then discharged.

Here, one end of the fixing member 62 is fixed to the body frame 63, one end of the movable member 64 is inserted into the other end of the fixing member 62 to reciprocate linearly, and the movable member ( A plurality of suction holes 64h are formed at one end of the 64 to allow the refrigerant to be sucked into the compression space P, and at the same time, the thin suction valve 66 is installed to be opened and closed, and the fixing member 62 is disposed. One end of the discharge valve assembly 68 is composed of a discharge valve 68a, a discharge cap 68b and a discharge valve spring 68c to be opened and closed to discharge the compressed refrigerant.

At this time, the movable member 64 is connected to the linear motor 70 and the other end is reciprocated linearly driven, the linear motor 70 is a permanent magnet 76 between the inner stator 72 and the outer stator 74 ) Is positioned with a predetermined gap so as to generate a reciprocating driving force by mutual electromagnetic force.

In more detail, the inner stator 72 is formed in a cylindrical shape in which a plurality of laminations are laminated in the circumferential direction so that one end is supported by the main body frame 63 and the other end is fixed by a fixing ring (not shown). The outer stator 74 is installed to be fixed to the outer circumferential surface of the member 62, and the outer stator 74 is formed in a cylindrical shape with core blocks spaced apart from the coil winding body so that one end thereof is also supported by the main body frame 63. One end is installed to be supported by the motor cover 90, and the permanent magnet 76 is located between the inner stator 72 and the outer stator 74 and connected to the other end of the movable member 64. It is installed to be connected by (not shown).

In addition, the movable member 64 imparts a predetermined elastic support force in the axial direction even though the other end is driven in the axial direction by the linear motor 70, and the supporter () is provided at the other end of the movable member 64. 80 is connected, and the supporter 80 is elastically supported by a plurality of springs S1 and S2 between the motor cover 90 and the main body cover 100.

Accordingly, when a current is applied to the linear motor 70, mutual electromagnetic force is generated between the inner stator 72, the outer stator 74, and the permanent magnet 76, and the movable magnet 76 is operated together with the permanent magnet 76. The member 64 and the supporter 80 are elastically supported in the axial direction by the springs S1 and S2 to reciprocate linearly, and the refrigerant is sucked into the compression space P, compressed, and then discharged. Will be repeated.

At the same time, while the muffler assembly 110 with the movable member 64 reciprocates linearly to reduce the flow noise of the suction refrigerant, the muffler assembly 110 reciprocates with the movable member 64 in the axial direction. The hole 100h is formed in the center portion of the main body cover 100 which is located in the axial direction to be close to the muffler assembly 110 so as to pass through even a linear movement.

At this time, the main body cover 100 is formed such that the flat plate is bent in a 'c' shape as shown in Figure 4, the hole (100h) is formed in the center of the refrigerant flows into the muffler assembly 110 Allow a portion of the to pass through, and both ends of the bent is formed with a fixing part 104 is assembled to the motor cover (80).

Of course, the main body cover 100 is positioned at predetermined intervals to prevent its central portion from colliding with the shell located in the axial direction even if the movable member 64 reciprocates linearly and vibrates. However, it is preferable that the diameter of the hole 100h is designed to allow a portion of the muffler assembly 110 to pass therethrough.

In particular, the muffler assembly 110 is installed closest to the body cover 100 in the axial direction, but the muffler assembly 110 is installed so as to partially pass through the hole 100h of the body cover. The length in the axial direction is determined in consideration of the stroke and axial direction of the reciprocating linear movement with the movable member 64 and the collision with the shell in the axial direction.

Specifically, the muffler assembly 110 is installed so that the noise tube 114, the suction chamber 116, and the auxiliary chamber 118 communicate with each other around the noise chamber 112 having the largest diameter so that the suction refrigerant is mutually different. As noise passes in the opposite direction as it passes through other spaces, the flow noise is reduced.

At this time, the noise chamber 112 and the suction chamber 116 has a cylindrical shape having a similar diameter and a small communication hole (not shown) is formed in the center even though the connection portions are partitioned from each other, and the suction chamber 116 is different from the other. At one end, a suction hole (not shown) is formed on the same axis as the communication hole, while the noise chamber 112 and the suction chamber 116 are installed outside the other end of the movable member 64, while the noise The tube 114 is installed to be inserted into the other end of the movable member 64.

Of course, the muffler assembly 110 allows the suction chamber 116 to pass through the hole 100h of the body cover as the reciprocating linear motion with the movable member 64.

In more detail, the noise chamber 112 may be formed in a cylindrical shape having a diameter larger than that of the hole 100h of the main body cover, but the suction chamber 116 may have a diameter greater than that of the hole 100h of the main cover. It is preferable that the diameter is formed in a cylindrical shape so as to pass through the hole (100h) of the body cover, the sound pipe 114 is larger in diameter than the noise chamber 112 and the suction chamber 116. It is desirable to form not only small but also long cylindrical shape.

In particular, the auxiliary chamber 118 is connected to one side of the suction chamber 116 in a relatively small diameter and its cylindrical shape, but may be formed to protrude outside the suction chamber 116, the suction chamber 116 may be formed to be inserted into the inside, such an auxiliary chamber 118 is to be installed on the same axis to be close to the inlet pipe of the shell.

Of course, the muffler assembly 110 may protrude so that the auxiliary chamber 118 is connected to the inside / outside of the suction chamber 116, and thus the length of the auxiliary chamber 118 is increased in the axial direction, thereby reducing the noise while passing. Is improved.

Therefore, the noise reduction process of the suction refrigerant, the refrigerant introduced through the inlet pipe of the shell is the auxiliary chamber 118, the suction chamber 116, the noise chamber 112 through the hole (100h) of the body cover , The refrigerant rapidly expands or contracts while passing through the noise tube 114, or passes through a passage having a large flow resistance, and then the suction valve 66 is opened to compress the air through the suction hole 64h of the movable member. Allow it to enter the space (P).

At this time, the pressure difference between the inside and the outside of the compression space (P) is large, so that the noise is greatly generated while the refrigerant is sucked into the compression space (P), and the noise is again the noise tube 114 and the noise chamber ( 112, while resonating while passing through the suction chamber 116, the auxiliary chamber 118 is reduced.

As a result, the muffler assembly 110 has a diameter smaller than the hole 100h of the main body cover so that the suction chamber 116, which is a part thereof, can pass through the hole 100h of the main body cover. In addition, since the auxiliary chamber 118 is formed at one side of the suction chamber 116 to extend in the axial direction, the internal space can be made larger and the axial length thereof can be increased to increase the noise reduction effect. Since the noise chamber 112 may pass through the main body cover 100 in the axial direction, the noise chamber 112 may be installed to maintain only a predetermined distance from the shell in the axial direction, thereby reducing the installation space and miniaturizing the product.

Furthermore, the muffler assembly 110 is variably driven together with the movable member 64 in a low cooling force mode or a high cooling force mode so that the muffler assembly 110 passes through the hole 100h of the body cover even though the stroke length is increased. The axial space with the shell can be secured to prevent collision.

5 is a graph illustrating a noise reduction amount according to an operating frequency in a conventional linear compressor and a linear compressor of the present invention.

In the conventional linear compressor, since the muffler assembly is installed to reciprocate linearly inside the mounting portion of the shell and the main body cover, the effect of reducing the flow noise of the suction refrigerant is doubled by the mounting portion and the muffler assembly. Since the main body cover is installed to reciprocate linearly while passing through the suction chamber of the muffler assembly inside the shell, the flow noise of the suction refrigerant is further reduced by increasing the diameter of the muffler assembly and its axial length. As shown, although the noise of the full frequency band is generated, it can be seen that the IL (Insertion loss) performance of the muffler assembly of the present invention is improved over the IL (Insertion loss) performance of the conventional muffler assembly, in particular in the 2000 ~ 2500 Hz band The IL (Insertion loss) performance of the muffler assembly of the present invention is significantly improved It can be seen that.

In this case, the IL (Insertion loss) performance refers to the insertion loss, and the IL performance of the muffler assembly of the present invention is higher than that of the conventional muffler assembly because the amount of noise reduced as the sucked noise passes through each muffler. It can be seen that the noise reduction effect is more excellent.

In the above, the present invention has been described in detail by way of examples based on the embodiments of the present invention and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

The noise reduction structure of the linear compressor according to the present invention, which is configured as described above, is relatively relatively compared to the conventional one because a portion of the linear compressor may move through the hole of the body cover in the axial direction even if the muffler assembly is reciprocated linearly with the movable member. In addition to forming a large-diameter noise chamber, an auxiliary chamber can also be formed on one side thereof in the axial direction, thereby increasing the noise space and the axial length of the muffler assembly as a whole to increase the noise reduction effect, and furthermore, to the shell in the axial direction. Since it is installed considering only the distance between the and muffler assembly, it is possible to reduce the axial installation space of the muffler assembly, thereby miniaturizing the product.

Claims (4)

delete A structure comprising a fixed member, a movable member, and a linear motor to suck and compress the refrigerant, and to discharge the refrigerant; A main body cover axially spaced apart from the structure to elastically support the movable member in the axial direction by a plurality of springs; A muffler assembly which is fixed to the movable member and installed so that a portion thereof passes through a hole formed in the center of the main body cover as the reciprocating linear movement is carried out, thereby reducing noise while the suction refrigerant passes therethrough, The muffler assembly includes a mounting portion overlapping one end of the movable member and fixed by a fastening member, a noise chamber having a diameter greater than or equal to the hole diameter so as to project in the axial direction toward the main body cover relative to the mounting portion, and the noise chamber is in communication with the noise chamber. A suction chamber having a diameter smaller than the diameter of the hole so as to be connected to the axial direction of the noise chamber and penetrating the hole so as to be protruded in the axial direction so as to be located inside the movable member with respect to the mounting portion; Noise reduction structure of the linear compressor, characterized in that configured to include a noise tube. The method of claim 2, The muffler assembly further comprises: an auxiliary chamber extending in an outer axial direction of the suction chamber at a front end of the suction chamber of the suction chamber, the noise reduction structure of the linear compressor. The method of claim 3, wherein The muffler assembly further includes an auxiliary chamber extending in the axial direction of the suction chamber at a front end of the suction chamber in which the refrigerant flows.

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