KR100624822B1 - Linear compressor - Google Patents

Abstract

In the linear compressor according to the present invention, the mass is directly connected to the main spring carrying the linear reciprocating movable part in the shell, and the mass of the mass is larger than the mass of the movable part, whereby the operating frequency of the linear compressor is increased. The vibration is attenuated when it coincides with the natural frequency of the movable part. The natural frequency of the movable part is changed according to the load of the linear compressor, and the operating frequency can be varied according to the load in order to damp the vibration. By driving in accordance with the natural frequency of the movable portion, there is an effect that high efficiency operation is possible.

Linear compressor, fixed part, moving part, linear motor, mass body, spring, dynamic reducer, operating frequency

Description

Linear compressor {Linear compressor}             

1 is a cross-sectional view showing a linear compressor according to the prior art,

2 is a sectional view showing a linear compressor according to the present invention;

<Explanation of symbols on main parts of the drawings>

50: shell 51: inlet

52: discharge port 53: suction pipe

54: discharge part assembly 55: discharge cover

56: discharge spring 57: discharge valve

58: discharge pipe 60: fixed portion

61: outer stator 62: inner stator

63: coil 64: cylinder

65: stator cover 70: movable part

71: magnet 72: magnet frame

73: piston 74: spring support

75: suction valve 76: silencer

80: main spring 81: first main spring

82: second main spring 90: mass

91: auxiliary spring

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear compressor, and in particular, the vibration can be attenuated when the operating frequency of the linear compressor coincides with the natural frequency of the movable part linearly reciprocating in the shell, thereby varying the operating frequency according to the load, thereby increasing It relates to a linear compressor capable of carrying out operation and yet capable of damping vibrations.

In general, a linear compressor is a device that sucks and discharges a fluid while linearly reciprocating a piston inside a cylinder by using a linear driving force of a linear motor.

1 is a cross-sectional view of a linear compressor according to the prior art.

As shown in FIG. 1, the linear compressor according to the related art has a shell 4 to which a suction pipe 2 into which a fluid is sucked is connected, and a cylinder block in which a cylinder 6 is mounted inside the shell 4. 8) and a back cover 12 equipped with a fluid inlet 10, wherein the cylinder block 8 and the back cover 12 are formed by the first damper 14 and the second damper 16 by the shell. It is supported by (4) so that cushioning is possible.

A linear motor 20 is disposed between the cylinder block 8 and the back cover 12 to generate a driving force to compress the fluid, and the linear motor 20 linearly reciprocates within the cylinder 6. A piston 18 is connected to compress the fluid sucked into the cylinder 6.

The linear motor 20 includes an outer stator 22 made of a laminated body, an inner stator 24 disposed to have a predetermined gap with the outer stator 22, and mounted on the outer stator 22 to form a magnetic field. A magnet 28 positioned between the coil 26 and the outer stator 22 and the inner stator 24 and linearly moved by a magnetic force formed around the coil 26, the magnet 28 and the piston 18 is fixed and consists of a magnet frame 30 for transmitting a linear movement force to the piston (18).

The piston 18 is formed with a flange portion 18a fixed to the magnet frame 30 at the rear, the first spring 32 disposed between the flange portion 18a and the cylinder block 8, It is elastically supported by a second spring 34 disposed between the flange portion 18a and the back cover 12.

In addition, the piston 18 is formed with a suction flow path 18b through which fluid is sucked, and a plurality of suction ports 18c are formed on a front surface thereof, and a suction valve 36 for opening and closing the suction port 18c. Is provided.

A discharge part for discharging the compressed fluid is provided in front of the compression chamber C of the cylinder 6, and the discharge part is fixed to the cylinder block 8, and an inner discharge cover 38 having a fluid discharge hole formed at one side thereof. ), A discharge valve 42 supported by the discharge spring 40 on the inner discharge cover 38 to open and close the compression chamber C of the cylinder 6, and an outer side of the inner discharge cover 38. It consists of an outer discharge cover 44 arranged to form a predetermined space in the.

The outer discharge cover 44 is provided with a discharge pipe 46 through which the fluid is discharged, and the discharge pipe 46 has one end of the loop pipe 48 for guiding the discharged fluid to the outside of the shell 4. Connected, the loop pipe 48 penetrates the shell 4 and is exposed to the outside.

Looking at the operation of the linear compressor according to the prior art configured as described above are as follows.

As the linear motor 20 is operated, the magnet 28 linearly reciprocates in interaction with the magnetic field around the coil 26, and this movement force is transmitted to the piston 18 through the magnet frame 30. ), The piston 18 continuously compresses and discharges the fluid while linearly reciprocating.

When the piston 18 moves backward, the suction valve 36 is opened due to the pressure difference between the suction passage 18b and the compression chamber C, and the suction passage 18b of the piston 18 is opened. The fluid flows into the compression chamber C through the suction port 18c.

On the other hand, when the piston 18 is advanced toward the discharge portion, the suction valve 36 is closed by the pressure difference between the suction flow path 18b and the compression chamber (C), the interior of the compression chamber (C) The fluid that was in is compressed and then discharged through the discharge portion.

However, since the linear compressor according to the related art is configured such that the linear compressor for compressing the fluid inside the shell 4 is supported by the first damper 14 and the second damper 16, the compressor can be miniaturized. There is a problem with limitations.

On the other hand, when a dynamic reducer (not shown) made of a mass body (not shown) and an elastic member (not shown) is mounted on the outside of the shell 4, the operating frequency of the linear compressor is adjusted to the natural frequency of the dynamic reducer. In addition, since the vibration is absorbed by the copper reducer, since the natural frequency of the copper reducer is predetermined by the mass of the mass and the spring stiffness of the elastic member, the operating frequency may be varied according to the load for high efficiency operation. In this case, there is a problem in that the vibration is increased, and in order to attenuate the vibration, there is a problem in that the efficiency is lowered because the operating frequency cannot be changed according to the load of the linear compressor.

The present invention has been made to solve the above problems of the prior art, it is configured to attenuate vibration even when changing the operating frequency of the linear compressor according to the load, it is possible to damp the vibration and at the same time high efficiency operation The purpose is to provide a linear compressor.

The linear compressor according to the present invention for solving the above-mentioned problems is elastic with a shell, a fixed part fixedly mounted in the shell, a movable part for linear reciprocating motion in the shell, and a linear reciprocating motion of the movable part. It characterized in that it comprises a plurality of main springs to be supported by, a mass body connected to the main spring, and an auxiliary spring is installed between the shell and the mass body, the elastic body to elastically support the mass body.

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

2 is a cross-sectional view of a linear compressor according to the present invention.

As shown in FIG. 2, the linear compressor according to the present invention includes a shell 50 having an inlet port 51 and an outlet port 52, a fixed part 60 fixedly mounted inside the shell 50, and A movable part 70 formed to compress the fluid while linearly reciprocating in the shell 50, a plurality of main springs 80 elastically supporting the linear reciprocating motion of the movable part 70, and the main spring It comprises a mass 90 connected to 80, and an auxiliary spring 91 provided between the shell 50 and the mass 90 to elastically support the mass 90.

The shell 50 is formed in a cylindrical structure, the discharge port 52 is formed on the front surface, the suction port 51 is formed on the rear side, the suction port 51, the suction pipe for the fluid is sucked from the outside ( 53 is installed to penetrate through, and the discharge unit assembly 54 for discharging the compressed fluid in front of the discharge port 52 is installed.

The fixing part 60 includes an outer stator 61 fixed inside the shell 50, an inner stator 62 disposed to have a predetermined gap from the outer stator 61, and the outer stator 61. And a coil 63 mounted on the coil 63 to form a magnetic field, and a cylinder 64 mounted inside the shell 50.

In addition, the shell 50 is equipped with a stator cover 65 supporting the outer stator 61, and the stator cover 65 is located at the rear side of the outer stator 61.

In addition, the movable portion 70 is located between the outer stator 61 and the inner stator 62 and the magnet 71 is linearly moved by a magnetic force formed around the coil 63, and the magnet 71 It comprises a supporting magnet frame 72, and a piston (73) coupled to the magnet frame (72) and arranged to be linearly movable in the cylinder (64).

In addition, a flange portion 73a coupled to the magnet frame 72 is formed at the rear of the piston 73, and a spring support 74 supporting the main spring 80 is formed at the flange portion 73a. Combined.

The outer stator 61, the inner stator 62, the coil 63, the magnet 71, and the magnet frame 72 are linear motors that generate a driving force of the linear compressor.

In addition, the cylinder 64 is fixed to the discharge port 52 side in the shell 50 and has a cylindrical structure in which both sides are open. The cylinder 73 and the discharge part assembly 54 are provided by the cylinder 73. The compression chamber C is formed.

The discharge part assembly 54 is fixed to the outside of the shell 50, the discharge cover 55 for buffering the fluid discharged through the discharge port 52, and the discharge spring 56 in the discharge cover 55 A discharge valve 57 which is supported by the cylinder and opens and closes the compression chamber C of the cylinder 64 and a discharge pipe 58 connected to the discharge cover 55 to guide the discharged fluid to the outside. do.

In addition, a suction flow path 73b through which the fluid is sucked through the suction pipe 53 is formed in the piston 73, and a plurality of suction ports 73c and a plurality of suction ports 73c are formed on the front surface thereof. It is equipped with a suction valve 75 for opening and closing.

In addition, the rear of the piston 73 is provided with a silencer 76 is connected to the suction pipe 53 to reduce the suction noise.

On the other hand, the main spring 80 is a coil spring formed to impart an elastic force in the movement direction of the piston (73), the first main spring connected between the front surface of the spring support 74 and the stator cover (65) 81 and a second main spring 82 connected between the rear surface of the spring support 74 and the mass 90.

In addition, the auxiliary spring 91 is a coil spring formed to impart an elastic force to the mass body 90 in the front and rear direction, one end of which is fixed to the shell 50 and the other end of which is fixed to the mass 90. The plurality is mounted at a position spaced at an angle in the direction.

On the other hand, the mass of the mass 90 is formed to be larger than the mass of the movable portion 60, the movable portion 60 is configured to act as a copper reducer to further absorb the vibration by hanging on the mass 90 .

That is, the vibration of the linear compressor is absorbed when the operating frequency ω of the linear compressor, which is the excitation frequency, coincides with the natural frequency ω 1 of the movable part 60.

Here, the natural frequency ω1 of the movable part 60 is the sum of the mass m1 of the movable part 60, the spring stiffness k1 of the main spring 80, and the gas spring stiffness k_g, as described below. Is done.

m2> m1,

Since the gas spring stiffness k_g depends on the load of the linear compressor, the natural frequency ω1 of the movable part 60 changes when the load changes, and the operating frequency ω is also loaded in order to damp the vibration. It is configured to vary according to.

In addition, the mass 90 is arranged to be supported by the second main spring 82 and the auxiliary spring 91 in the shell 50, and is formed in a cylindrical structure.

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

 When the linear motor is operated, the magnet 71 linearly reciprocates in interaction with the magnetic field around the coil 63, and this momentum force is transmitted to the piston 73 through the magnet frame 72. The piston 73 compresses the fluid sucked into the compression chamber C of the cylinder 64 while continuously linearly reciprocating in the cylinder 64 to discharge the fluid into the discharge cover 55. Will repeat.

That is, when the piston 73 is reversed, the suction valve 75 is opened, the fluid in the suction flow path 73b of the piston 73 through the suction port 73c of the cylinder 64 When the piston 73 is advanced toward the compression chamber C, the fluid compressed in the compression chamber C pushes the discharge valve 57 into the compression chamber C. The discharge valve 57 is opened, and the compressed fluid is discharged to the outside through the discharge cover 55 and the discharge pipe 58.

On the other hand, during operation of the linear compressor, if the operating frequency ω of the linear compressor coincides with the natural frequency ω 1 of the movable part 70, the vibration in the movement direction of the movable part 70 is absorbed to cause vibration of the linear compressor. Will be attenuated.

Here, the principle that the vibration is attenuated is that when the vibration absorber composed of the auxiliary mass and the elastic member is additionally attached to the mass subjected to the external force, the vibration is absorbed in the copper reducer, the excitation frequency applied from the outside When it matches with the natural frequency of the copper reducer, the vibration is absorbed by the vibration absorber to utilize the principle that the vibration is reduced.

That is, since the mass of the mass 90 is configured to be larger than the mass of the movable part 70, the movable part 70 serves as an auxiliary mass suspended from the mass 90. When the driving frequency ω is adjusted to the natural frequency ω 1 of the movable unit 70, all of the vibrations are absorbed by the movable unit 70, and the vibration can be attenuated.

On the other hand, when the load of the linear compressor is changed, the natural gas (ω1) of the movable part 70 is changed because the gas spring stiffness (k_g) is changed.

When the natural frequency omega 1 of the movable part 70 changes according to the load, the vibration is attenuated by changing the operating frequency omega to correspond to the natural frequency omega 1 of the movable part 70.

Therefore, since the operating frequency ω is variable according to the load, the vibration can be attenuated even when the load is changed, and the operation can be performed at the optimum frequency according to the load, thereby improving efficiency.

The linear compressor according to the present invention configured as described above has a fixed part fixed directly inside the shell, a movable part linearly reciprocating in the shell, a main spring holding the movable part, and directly connected to the main spring. Composed of a mass and an auxiliary spring carrying the mass, the structure can be simplified to contribute to miniaturization and to damp vibrations.

In addition, the mass of the mass is formed larger than the mass of the movable portion, so that the vibration is absorbed when the operating frequency of the linear compressor coincides with the natural frequency of the movable portion, the natural frequency of the movable portion in accordance with the load of the linear compressor Since the operating frequency varies depending on the load, the vibration can be attenuated, and the efficiency can be improved because the driving can be performed at the optimum frequency according to the load.

Claims (5)

A shell; A fixing part fixedly mounted in the shell; A movable part which linearly reciprocates in the shell; A plurality of main springs that elastically support the linear reciprocating motion of the movable portion; A mass connected to the main spring; And an auxiliary spring provided between the shell and the mass to elastically support the mass. The method of claim 1, The mass is a linear compressor, characterized in that the mass is formed larger than the movable portion. The method of claim 1, And the auxiliary spring is a coil spring formed to impart an elastic force to the mass in a linear reciprocating direction of the movable part. The method according to any one of claims 1 to 3, The fixing part includes an outer stator fixed inside the shell, an inner stator disposed to have a predetermined gap from the outer stator, a coil mounted on the outer stator to form a magnetic field, and a cylinder mounted inside the shell. Composed, The movable part includes a magnet positioned between the outer stator and the inner stator and linearly moved by a magnetic field, a magnet frame supporting the magnet, and a piston coupled to the magnet frame and arranged to be linearly movable in the cylinder. Linear compressor comprising a. The method of claim 4, wherein And the main spring comprises a first main spring connected between the piston and an outer stator, and a second main spring connected between the piston and a mass body.

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