KR20100081816A - Hermetic compressor and refregerator having the same - Google Patents

Abstract

The present invention relates to a hermetic compressor and a refrigerator having the same. According to the present invention, friction noise in each bush is remarkably attenuated by fabricating the bushes constituting the crankshaft and the bearing surface with a small coefficient of friction. It is possible to prevent the electromagnetic field from resonating with the friction noise between the crankshaft and the bushes. As a result, the noise of the hermetic compressor to which the aluminum coil is applied or the refrigerating device having the hermetic compressor can be prevented from being increased.

Description

Hermetic compressor and refrigeration equipment with the same {HERMETIC COMPRESSOR AND REFREGERATOR HAVING THE SAME}

The present invention relates to a hermetic compressor and a refrigerating device having the same, and more particularly to a hermetic compressor and a refrigerating device having a bearing or bush made of aluminum to support a crankshaft when using an aluminum coil-applied motor.

In general, the hermetic compressor is provided with a compression unit for compressing a refrigerant by receiving a driving force coupled to the transmission unit generating a driving force in the inner space of the sealed casing and the transmission unit.

Single-phase induction motor is widely used as the drive motor of the hermetic compressor. The single-phase induction motor is built in a compressor applied to a refrigerator, an air conditioner, and the like, a small household electric appliance. The single-phase induction motor has a stator to which a coil is wound, a rotor provided with a conductor to be rotatably inserted inside the stator, and a crank shaft that is press-fitted to the center of the rotor to transmit rotational force to the compression unit of the compressor. Is done.

As the coil of the drive motor, copper (Cu) having good electrical conductivity is generally used. The conductivity usually indicates the degree of good current flow in the material. However, the high conductivity does not necessarily mean that there are more electrons flowing. Since the number of electrons is proportional to the current, even if the conductivity is bad, it can be said that the number of electrons is the same if the current is the same. However, the higher the conductivity for the same current can reduce the loss (heat) generated by itself. Silver (Ag) is known as the metal with the highest electrical conductivity, but silver is not suitable for use as a motor of a household compressor because of its high price. Therefore, as a coil used in a motor of a household compressor, copper is used, which is relatively inexpensive and has good electrical conductivity.

Recently, however, an example of using an aluminum coil instead of copper has been introduced to further reduce the manufacturing cost of the compressor. In the case of aluminum, the conductivity is not as good as that of copper, but it has a certain conductivity compared to other materials and is relatively inexpensive, so it has been actively studied as a coil of a compressor motor.

However, in the case of the hermetic compressor using the aluminum coil as described above, electromagnetic noise is generated in the motor, and the electromagnetic noise resonates with other friction noise generated between the crankshaft and the bearing to generate high low Hz noise. There was this.

The present invention solves the problems of the conventional hermetic compressor as described above. When the aluminum coil is applied, friction noise between the crankshaft and the bearing is attenuated so that the electromagnetic field generated from the motor resonates with the friction noise. It is an object of the present invention to provide a hermetic compressor and a refrigerating apparatus having the same that can be prevented in advance.

In order to achieve the object of the present invention, to achieve the object of the present invention, a casing having a sealed inner space; At least a part of a coil installed and wound in an inner space of the casing is formed of an aluminum coil; A crank shaft coupled to the rotor of the drive motor to transmit rotational force to the compression unit; And at least one bearing rotatably supporting the crankshaft, wherein at least one surface constituting the crankshaft and the bearing surface is formed of an aluminum material.

In addition, the casing having a closed inner space; A driving motor provided in the inner space of the casing to generate a rotational force; A crank shaft coupled to the rotor of the drive motor to transmit rotational force; At least one frame fixed to the casing to support the crankshaft; A fixed scroll fixed to one of the frames; And a turning scroll which engages with the fixed scroll and is eccentrically coupled to the crankshaft to form two pairs of compression chambers while pivoting. At least a part of the coil wound around the driving motor is made of aluminum wire. At least one surface forming the outer circumferential surface of the crankshaft and the bearing surface of the crankshaft is provided with an aluminum-type compressor.

In addition, a compressor; A condenser connected to the discharge side of the compressor; An expander coupled to the condenser; And an evaporator connected to the inflator and connected to the suction side of the compressor, wherein the compressor is provided with a hermetic compressor including a crankshaft and a bearing surface formed of an aluminum material.

In the hermetic compressor according to the present invention and the refrigerating device having the same, friction noise in each bush is remarkably attenuated by making the bush forming the crankshaft and the bearing surface made of aluminum having a small coefficient of friction, and thus the coil of the driving motor. It is possible to prevent the electromagnetic noise from resonating with the friction noise between the crankshaft and the bush even if the electromagnetic sound generated by the aluminum wire. As a result, the noise of the hermetic compressor to which the aluminum coil is applied or the refrigerating device having the hermetic compressor can be prevented from being increased.

Hereinafter, a hermetic compressor according to the present invention and a refrigerating apparatus having the same will be described in detail based on an embodiment shown in the accompanying drawings.

1 is a longitudinal sectional view showing an example of a scroll compressor to which an aluminum coil according to the present invention is applied.

As shown therein, the scroll compressor according to the present invention includes a casing 10 connected to an inner space in which the suction pipe 11 and the discharge pipe 12 are sealed, and a main fixedly coupled to the inner space of the casing 10. A frame 20 and a subframe 30, a drive motor 40 installed between the main frame 20 and the subframe 30 to generate a driving force, and a crank shaft of the drive motor 40. 43) a fixed scroll (50) eccentrically coupled to the main frame (20), and a pair of compression chambers (P) continuously moving in the center direction while pivoting in engagement with the fixed scroll (50). The rotating scroll 60 to be formed, and the old dam ring 70 is installed between the main frame 20 and the rotating scroll 60 to prevent the rotating movement of the rotating scroll 60.

The casing 10 is divided into a suction space S1 that is a low pressure space and a discharge space S2 that is a high pressure space in the fixed scroll 50, while the suction pipe 11 is connected to the suction space S1 while the The discharge pipe 12 is connected to the discharge space (S2).

The main frame 20 is disposed above the drive motor 40 and its outer circumferential surface is welded and fixed to the inner circumferential surface of the casing 10. A bearing hole 21 is formed in the center of the main frame 20 so that the crank shaft 43 of the driving motor 40 is inserted, and the crank shaft 43 is formed at the upper end of the bearing hole 21. The oil pocket 22 is formed to store the oil sucked through. The first bush 110 is inserted into and coupled to an inner circumferential surface of the bearing hole 21 to form a bearing surface with an outer circumferential surface of the crank shaft 43.

The subframe 30 is disposed below the drive motor 40 and its outer circumferential surface is welded and fixed to the inner circumferential surface of the casing 10. A bearing hole 31 is formed in the center of the subframe 30 so that the crank shaft 43 is inserted, and an inner circumferential surface of the bearing hole 31 forms a bearing surface with an outer circumferential surface of the crank shaft 43. The second bush 120 is inserted and coupled.

On the opposite surfaces of the fixed scroll 50 and the rotating scroll 60, a fixed wrap 51 and a swing wrap 61 are formed in a spiral shape to mesh with each other to form a pair of compression chambers P, respectively. In addition, a suction groove 52 communicating with the suction pipe 11 is formed at one side of the fixed scroll 50, and a refrigerant discharged from the final compression chamber P is formed at the center of the fixed scroll 50. A discharge port 53 that guides to the discharge space S2 of 10 is formed. In addition, a boss portion 61 is formed on the bottom of the turning scroll 60 so that the crank shaft 43 is coupled, and an inner circumferential surface of the boss portion 61 forms a pin portion and a bearing surface of the crank shaft 43. The third bush 130 is inserted and coupled.

In the drawings, reference numeral 41 denotes a stator, 42 a rotor, and 80 a check valve.

In the scroll compressor configured as described above, when the power is applied to the driving motor 40 to rotate, the rotating scroll 60 rotates while the crank shaft 43 coupled to the rotor 42 rotates. Will be As the revolving scroll 60 rotates, the compression chamber P between the fixed scroll 50 and the revolving scroll 60 gradually moves toward the center thereof, and the volume thereof is narrowed, through the suction groove 52. The refrigerant in the suction chamber P is gradually compressed, and a series of processes in which the compressed refrigerant is discharged to the discharge space S2 through the discharge port 53 in the final compression chamber is continuously performed.

Here, the driving force of the drive motor 40 is generated by the rotor flux of the stator 41 constituting the drive motor 40 and the induced current of the rotor 42 accordingly. To this end, a coil 44 is wound around the stator 41 and a permanent magnet (not shown) is inserted into the rotor 42.

As described above, the coil 44 generally uses a material having good conductivity, that is, copper, but recently, an aluminum wire may be used to reduce manufacturing cost.

However, when the aluminum wire is used as the coil 44, the electromagnetic field of low Hz is greatly generated by the material properties of the aluminum wire. The electromagnetic sound is resonated with the friction noise generated while the crankshaft 43 rotates, thereby increasing the abnormal noise. Therefore, when the aluminum wire is used as the coil 44 of the drive motor 40, the crank in order to prevent the electromagnetic noise of the aluminum coil and other noise, that is, the friction noise of the crank shaft 43 is resonated. It is necessary to prevent or minimize the friction noise of the shaft 43.

For example, when the first bush 110, the second bush 120 and the third bush 130 forming the bearing surface with the crankshaft 43 are made of cast iron or Teflon material having a large coefficient of friction, As the respective bushes 110, 120, 130 come into contact with the crankshaft 43, friction noise is increased, and the increased friction noise can resonate with the electromagnetic field as described above. Therefore, in order to eliminate or minimize the friction noise generated in the first bush 110, the second bush 120 and the third bush 130, the at least one bush does not cause friction noise, That is, it is preferable to produce a material having a lower coefficient of friction than the cast iron or Teflon material.

2 and 3 illustrate the first bush among the first bush, the second bush and the third bush as an example, wherein the first bush is made of aluminum and press-fitted into each of the bearing holes of the main frame and the subframe. This is an example. The second bush and the third bush may be manufactured in accordance with this.

That is, FIG. 2 illustrates that the entirety of the first bush 110 is made of aluminum, respectively, and is press-fitted into the bearing holes of the main frame and the subframe. Only the inner diameter portion in contact with the crankshaft 43 is formed of aluminum. Here, when the first bush 110 is formed of aluminum only as shown in FIG. 3, the inner diameter part 111 is formed of aluminum, while the outer diameter part 112 has a greater strength or friction coefficient than aluminum. It may be formed of a large material. In this case, the aluminum material constituting the inner diameter portion 111 and the material constituting the outer diameter portion 112 (for example, cast iron or Teflon) may be manufactured by insert die casting or insert molding method, or by coating aluminum. .

As described above, when the first bush 110, the second bush 120 and the third bush 130 are made of an aluminum material having a small coefficient of friction, in each of the bush 110, 120 and 130, As the noise of friction is significantly attenuated, the coil 44 of the driving motor 40 is made of aluminum wire, so that the electromagnetic sound is generated by the crankshaft 43 and the bushes 110 and 9120. It is possible not to resonate with the friction noise between the 130, thereby increasing the noise of the scroll compressor to which the aluminum coil is applied.

This can be confirmed through a graph comparing the compressor noise when the cast iron or Teflon bush is applied and the compressor noise when the bush of aluminum is applied, as shown in FIG. 4. That is, when the cast iron or Teflon bush is applied as shown by the hollow bar graph in FIG. 4, the noise when the aluminum bearing is applied is significantly higher than that when the bearing is made of cast iron, especially in the low Hz region near 630 kHz. You can see the decrease. As mentioned above, the electromagnetic noise generated by the application of the aluminum coil is resonant with the friction noise, and thus the compressor noise may increase. However, when the bush is made of aluminum, the noise in the low Hz region is greatly increased in the vicinity of 630 kHz. It is reduced. This is because as the aluminum bush is used, the friction noise between the bush and the crankshaft hardly occurs, and the electromagnetic field generated when the aluminum coil is applied does not resonate.

As described above, the bush made of aluminum has a low friction coefficient and a low load applied between the crankshaft and the bearing (or bush) during the operation of the compressor, resulting in a low temperature of the bearing, resulting in adhesion of oil contacting the bearing surface. It can be prevented in advance so that the lubrication effect can be further improved. As a result, friction loss is reduced, and thus the efficiency of the compressor can be improved.

On the other hand, even when the driving motor applying the aluminum coil as described above is applied to a rotary compressor or a reciprocating compressor, a bush having a friction coefficient smaller than that of cast iron, such as aluminum, is inserted into the bearing surface of each bearing supporting the crankshaft or the bearing surface. This may be coated.

For example, in the case of a rotary compressor, as shown in FIG. 5, an aluminum coil 254 is wound around the driving motor 250, and the upper and lower sides of the cylinder 260 provided below the driving motor 250 are respectively. The crankshaft 253 may be radially supported by inserting the bushes 210 and 220 into the bearing surfaces of the upper bearing 270 and the lower bearing 280 to be installed. In this case, the bushes 210 and 220 of the upper bearing 270 and the lower bearing 280 may be formed of aluminum, or the inner circumferential surface thereof may be coated or manufactured with aluminum. In this way, the electromagnetic field generated while the aluminum coil 254 is wound around the driving motor 250 is not resonated with friction noise between the crankshaft 253 and the bearing surfaces of the bushes 210 and 220. In this way, it is possible to significantly reduce the low-Hz noise that may be generated during operation of the rotary compressor to which the aluminum coil is applied as in the above-described embodiment. In the drawings, reference numeral 251 denotes a stator, 252 denotes a rotor, and 290 denotes a rolling piston.

In another embodiment, in the case of the reciprocating compressor as shown in FIG. 6, the bush 310 including the aluminum material in the bearing hole of the cylinder block 361 supporting the crankshaft 353 as in the above-described embodiments. Can be installed by inserting

As a result, the electromagnetic noise generated while applying the aluminum coil 354 in the driving motor 350 is frictional noise generated at the bearing surface between the crankshaft 353 and the bush 310. By preventing the resonance in advance, the low Hz noise of the reciprocating compressor to which the aluminum coil 354 is applied can be significantly reduced. In this case, the bush 320 may be coupled to the bearing surface between the cam portion of the crankshaft 353 and the connecting rod 362, and the bush 320 may also include an aluminum material as described above. In the drawings, reference numeral 351 denotes a stator, 352 denotes a rotor, and 363 denotes a piston.

When the hermetic compressors according to the present invention are applied to a refrigerator, the noise of the refrigerator can be lowered.

For example, in the refrigerator 700 having a refrigerant compression type refrigeration cycle including a scroll compressor, a condenser, an expander, and an evaporator, as shown in FIG. 710 is connected to the scroll compressor (C). In the case where an aluminum coil is used for the drive motor installed in the scroll compressor C, an electromagnetic field generated by applying the aluminum coil to the bearing surface supporting the crankshaft of the drive motor is applied. The sound can be prevented from resonating with the friction noise on the bearing surface, thereby reducing the low Hz noise of the scroll compressor, thereby lowering the noise of the refrigerating machine to which the scroll compressor is applied.

The hermetic compressor according to the present invention may be equally applied to a bearing surface to which an aluminum coil is applied, such as a rotary compressor and a reciprocating compressor, as well as a scroll compressor.

1 is a longitudinal sectional view of a scroll compressor having an aluminum bush according to the present invention;

Figure 2 is a perspective view showing one embodiment of the aluminum bush according to Figure 1,

3 is a perspective view showing another embodiment of another aluminum bush in FIG.

4 is a graph showing a comparison of noise when the aluminum bush and the general bush of the present invention,

5 is a longitudinal sectional view showing a rotary compressor provided with an aluminum bush according to the present invention;

6 is a longitudinal sectional view showing a reciprocating compressor equipped with an aluminum bush according to the present invention;

Figure 7 is a schematic view showing an example applied to the air conditioner hermetic compressor with an aluminum bush according to the present invention.

** Description of symbols for the main parts of the drawing **

20: mainframe 30: subframe

43: crankshaft 50: fixed scroll

60: turning scroll 110,120,130: bush

111: inner diameter 112: outer diameter

Claims (14)

A casing having a closed inner space; At least a part of a coil installed and wound in an inner space of the casing is formed of an aluminum coil; A crank shaft coupled to the rotor of the drive motor to transmit rotational force to the compression unit; And At least one bearing rotatably supporting the crankshaft; At least one surface of the crank shaft and the bearing surface is formed of an aluminum material. The method of claim 1, The bearing is composed of a body supported by the casing, and a bush inserted into the body to form the crankshaft and the bearing surface, The bush is a hermetic compressor formed of aluminum. The method of claim 2, The bush is a hermetic compressor formed entirely of aluminum. The method of claim 2, The inner diameter portion of the bush is formed of an aluminum material while the outer diameter portion is a hermetic compressor formed of a material having a larger coefficient of friction than the aluminum material. The method of claim 4, wherein The inner diameter portion and the outer diameter portion is a hermetic compressor manufactured by insert die casting. The method of claim 4, wherein The inner diameter portion is a hermetic compressor is coated on the inner peripheral surface of the outer diameter portion. The method of claim 1, The bearing is made of a body supported by the casing and the inner circumferential surface thereof forms a bearing surface, Hermetic compressor with aluminum material coated on the inner circumference of its body. A casing having a closed inner space; A driving motor provided in the inner space of the casing to generate a rotational force; A crank shaft coupled to the rotor of the drive motor to transmit rotational force; At least one frame fixed to the casing to support the crankshaft; A fixed scroll fixed to one of the frames; And And a rotating scroll which is engaged with the fixed scroll and eccentrically coupled to the crankshaft to form a pair of compression chambers while rotating. At least a part of the coil wound on the driving motor is made of aluminum wire, and at least one surface forming the outer circumferential surface of the crankshaft and the bearing surface is formed of an aluminum material. The method of claim 8, And a bush is inserted between the frame and the crankshaft or between the turning scroll and the crankshaft, wherein the bush is made of aluminum. 10. The method of claim 9, The bush is a hermetic compressor formed entirely of aluminum. 10. The method of claim 9, The inner diameter portion of the bush is formed of an aluminum material while the outer diameter portion is a hermetic compressor formed of a material having a larger coefficient of friction than the aluminum material. The method of claim 11, The inner diameter portion and the outer diameter portion is a hermetic compressor manufactured by insert die casting. The method of claim 11, The inner diameter portion is a hermetic compressor is coated on the inner peripheral surface of the outer diameter portion. compressor; A condenser connected to the discharge side of the compressor; An expander coupled to the condenser; And And an evaporator connected to the inflator and connected to the suction side of the compressor. The compressor of claim 1, wherein the compressor comprises the hermetic compressor of any one of claims 1 to 13.

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