KR20220088559A - Electric scroll compressor - Google Patents

Abstract

The present invention includes a housing in which a rotor and a rotating shaft are disposed at an inner center, a stator is configured to be spaced apart from the outside of the rotor, and the rotor and the rotating shaft rotate by an electromagnetic induction action of the stator; , an orbiting wrap is formed on one side, and an orbiting scroll connected to one end of the rotation shaft on the opposite side and rotating as the rotor rotates, and the orbiting scroll coupled to the housing and built in the housing toward the side A compression chamber is formed on the surface to correspond to the orbiting lap of the orbiting scroll, and the fixed scroll is formed with a fixed wrap for compressing the incoming refrigerant and then discharging it, coupled to the rear surface of the fixed scroll, and to the fixed scroll A discharge cap having a discharge chamber for accommodating the refrigerant discharged from the fixed scroll is formed on an adjacent inner side, and a sliding bush coupled to a crank pin extending from the rotating shaft toward the orbiting scroll, one surface of which is in close contact with the orbiting scroll. , the crankpin to which the sliding bush is coupled is formed with a flat surface perpendicular to the longitudinal direction of the crankpin, and the flat surface is inclined counterclockwise to lower the force transmitted from the motor to the orbiting scroll to lower the compressor Provided is an electric scroll compressor in which a load applied to the compressor is reduced, power consumption is reduced, durability of the compressor is improved, and driving noise of the compressor is reduced.

Description

Electric scroll compressor

The present invention relates to an electric scroll compressor, and more particularly, to a crank pin extending from a rotating shaft of an electric motor and a crank pin coupling hole of a sliding bush in a counterclockwise direction based on a vertical line crossing up and down. By tilting at an angle of 30° or more and 40° or less, the force transmitted from the motor to the orbiting scroll is lowered, thereby reducing the load on the compressor, reducing power consumption, improving the durability of the compressor, and driving noise of the compressor. It relates to a decreasing electric scroll compressor.

In general, in an electric scroll compressor, referring to Japanese Patent Laid-Open No. 2003-184750, a motor including a rotor and a stator is provided inside the housing, and by supplying electric power to the motor, a drive shaft connected to the rotor is rotated, The gas medium is compressed by the rotational power of the drive shaft.

In this case, a fixed scroll having a spiral scroll formed on one side of the motor and being fixed regardless of the rotation of the driving shaft, and also having a spiral scroll formed therein and rotating according to the rotation of the driving shaft; By rotating the orbiting scroll with respect to the fixed scroll in a state in which the refrigerant is sucked into the compression chamber formed between the and the orbiting scroll, the refrigerant is compressed through the compression unit formed between the scroll wraps so that the volume is deformed.

In the conventional scroll compressor, the eccentric bush and the sliding bush used as the radial conforming mechanism are provided with a balance weight to match the unbalance of the orbiting scroll.

At this time, as shown in FIG. 1, in the conventional electric scroll compressor, the angle between the crankpin of the rotating shaft and the crankpin insertion hole of the sliding bush is processed in consideration of only the compressive force generated in the orbiting scroll. Due to the action of the sliding bush, a sealing force acting in the radial direction opposing the compression force is generated between the fixed scroll and the orbiting scroll, preventing refrigerant leakage from the compression chamber and compressing the refrigerant between both scrolls (low temperature and low pressure). High-temperature and high-pressure gas-phase refrigerant) is carried out in gas-phase refrigerant.

However, in the conventional electric scroll compressor, since the angle of the crankpin is provided in a vertical line crossing the top and bottom, the compressive force transmitted from the motor to the orbiting scroll is excessively generated in the horizontal direction, so that the crankpin insertion hole and the crankpin As a lot of noise and vibration were generated due to the gap between them, the durability of the compressor was deteriorated.

The present invention is formed by tilting the crankpin extending from the rotary shaft of the electric motor and the crankpin coupling hole of the sliding bush at an angle of 30° or more and 40° or less in the counterclockwise direction based on a vertical line crossing the top and bottom. Accordingly, it is to provide an electric scroll compressor in which the load applied to the compressor is reduced by lowering the force transmitted from the motor to the orbiting scroll, the power consumption is reduced, the durability of the compressor is improved, and the driving noise of the compressor is reduced. The purpose.

The electric scroll compressor according to the present invention includes a housing in which a rotor and a rotating shaft are disposed at an inner center, a stator is configured to be spaced apart from the outside of the rotor, and the rotor and the rotating shaft rotate by an electromagnetic induction action of the stator; A revolving scroll built into the housing, a revolving wrap is formed on one side, and connected to one end of the rotary shaft on the opposite side to perform revolving motion as the rotor rotates, coupled to the housing and built into the housing A compression chamber is formed on the surface facing the orbiting scroll side to correspond to the orbiting lap of the orbiting scroll in orbiting motion, and a fixed scroll having a fixed wrap for compressing the incoming refrigerant and then discharging it is formed, and the fixed scroll is coupled to the rear surface of the fixed scroll, , a discharge cap having a discharge chamber accommodating the refrigerant discharged from the fixed scroll on an inner side adjacent to the fixed scroll, and coupled to a crank pin extending from the rotating shaft toward the orbiting scroll, one surface of which is in close contact with the orbiting scroll A sliding bush is included, and the crankpin to which the sliding bush is coupled has a flat surface perpendicular to a longitudinal direction of the crankpin, and the flat surface is inclined in a counterclockwise direction.

At this time, the flat surface of the crankpin according to the present invention is formed in plurality.

And the coupling hole to which the crankpin is coupled among the sliding bushes according to the present invention has a slope while being formed in a shape corresponding to the vertical cross-sectional shape of the crankpin.

In addition, the inclination angle of the crankpin according to the present invention is an imaginary line A passing through the center of the balance weight of the sliding bush, an imaginary line B passing through the center of the crankpin, and a crank parallel to the imaginary line B. It is preferable that the angle between the extension line B' extended from the flat surface of one side of the pin and the imaginary line A-B' is 30° or more and 40° or less.

The electric scroll compressor according to the present invention has the following effects.

The crankpin extending from the rotary shaft of the electric motor and the crankpin coupling hole of the sliding bush are inclined at an angle of 30° or more and 40° or less in the counterclockwise direction based on the vertical line crossing the top and bottom. The load applied to the compressor is reduced by lowering the force transmitted from the to the orbiting scroll, the power consumption is reduced, the durability of the compressor is improved, and the driving noise of the compressor is reduced.

1 is an exemplary view showing a coupling relationship between a rotary shaft, a crank pin, and a sliding bush of a conventional electric scroll compressor.
2 is a cross-sectional view illustrating the configuration of an electric scroll compressor according to an embodiment of the present invention.
3 is an exemplary view illustrating a coupling relationship between a rotating shaft of an electric scroll compressor, a crank pin, a sliding bush, and an orbiting scroll according to an embodiment of the present invention.
4 is an exemplary view showing a crankpin of an electric scroll compressor according to an embodiment of the present invention.
5 is a graph showing the noise evaluation results according to the crankpin angle.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that can be defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Accordingly, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and do not represent all of the technical spirit of the present invention. It should be understood that there may be variations.

The present invention is formed by tilting the crankpin extending from the rotary shaft of the electric motor and the crankpin coupling hole of the sliding bush at an angle of 30° or more and 40° or less in the counterclockwise direction based on a vertical line crossing the top and bottom. The present invention relates to an electric scroll compressor in which the load applied to the compressor is reduced by lowering the force transmitted from the motor to the orbiting scroll, the power consumption is reduced, the durability of the compressor is improved, and the driving noise of the compressor is reduced, With reference to the following.

First, the electric compressor 100 according to an embodiment of the present invention with reference to FIGS. 1 to 3 includes a housing 110, an orbiting scroll 120, a fixed scroll 130, and a discharge cap 200. First, the The housing 110 is provided with a rotor 111 and a rotating shaft 113 in its inner space.

At this time, a suction port (unsigned) through which the refrigerant is sucked is formed in the housing 110 , and a stator 112 is configured on the outer periphery of the rotor 111 based on the inside, and the electrons of the stator 112 are formed. The rotor 111 and the rotation shaft 113 are rotated by the induction action.

As for the rotor 111 and the stator 112 accommodated in the housing 110, the stator 112 is mounted along the inner surface of the housing 110 as in the configuration of a general electric motor, and the rotation The electrons 111 are rotatably spaced apart from each other inside the stator 112 .

Therefore, the rotation shaft 113 is rotatably mounted inside the rotor 111, and when an electromagnetic field is generated in the stator 112 by power supplied from the outside, the stator 112 is induced by electromagnetic induction. ) and the rotor 111 and the rotation shaft 113 mounted inside the rotational movement, and as the rotor 111 rotates, scroll compression is performed.

In order to achieve the scroll compression, an orbiting scroll 120 having a spiral orbiting wrap 121 formed on one side of the housing 110 is mounted. It is connected and is rotatably provided by a bearing inside the center housing connected to the housing 110 .

Accordingly, when the rotating shaft 113 rotates as the rotor 111 rotates by the electromagnetic induction action of the stator 112 by the above configuration, the orbiting scroll 120 is rotated while the orbiting scroll ( The orbiting wrap 121 formed on one side of the 120 also rotates.

An Oldham coupling (unsigned) for preventing rotation of the orbiting scroll 120 while moving in a circular orbit may be further provided between the housing 110 and the orbiting scroll 120 .

A fixed scroll 130 is coupled to one side of the housing 110 on which the orbiting scroll 120 is provided, and a fixed wrap 131 is formed on the fixed scroll 130, and the fixed wrap 131 is the The orbiting lap 121 of the orbiting scroll 120 is engaged with each other and coupled to each other.

As the fixed scroll 130 is coupled to the housing 110 , the fixed lap 131 of the fixed scroll 130 is disposed to be engaged with the orbiting wrap 121 and the orbiting lap 121 is rotated. Accordingly, a compression chamber for compressing and discharging the incoming refrigerant is formed.

The compression capacity is determined according to the volume of the compression pocket formed between the orbiting wrap 121 of the orbiting scroll 120 and the fixed lap 131 of the fixed scroll 130, and the orbiting wrap 121 and the fixed wrap When the width of 131 is relatively longer than that of the conventional one, the compression capacity is increased, and on the contrary, when the width is relatively shorter than that of the conventional one, the compression capacity is lowered.

In addition, the fixed scroll 130 is preferably formed to have the same circumference as one end of the housing 110 , and when the fixed scroll 130 is coupled to one end of the housing 110 , the fixed scroll 130 ) It is preferable that an O-ring (not shown) is provided between the one end of the housing 110 and the fixed scroll 130 so that airtightness between the fixed scroll 130 and one end of the housing 110 is maintained.

And the discharge cap 200 is coupled to the rear of the fixed scroll 130, and it is preferable that the discharge cap 200 is provided with a discharge port (unsigned) through which the compressed refrigerant is discharged.

At this time, the discharge cap 200 closely coupled to the rear surface of the fixed scroll 130 has a discharge chamber accommodating the refrigerant discharged from the fixed scroll 130 in the inner space adjacent to the fixed scroll 130 is formed. .

In the electric scroll compressor according to an embodiment of the present invention, a crank pin 114 is extended from one end of the rotation shaft 113 provided inside the rotor 111 of the housing 110, and the crank pin 114 is formed. A sliding bush 140 in close contact with one surface of the orbiting scroll 120 is coupled to the pin 114 .

'을 이룬다.In this case, the crankpin 114 forms an eccentricity with the center of the rotor 111 , and a pair of flat planes facing each other while perpendicular to the longitudinal direction are formed on the crankpin 114 , so that the crankpin 114 is eccentric. ) is the cross-sectional shape of '

' to achieve

And looking at the sliding bush 140 in more detail, on one surface of the sliding bush 140, a cylindrical accommodating part 141 with an open side for accommodating the crank pin 114 is formed, and the accommodating part (141) A coupling hole 142 is formed in the center, and the crankpin 114 is coupled through the coupling hole 142.

'을 이루고, 상기 슬라이딩 부쉬(140)의 수용부(141)에서는 밸런스웨이트(143)를 연장형성하는데, 상기 밸런스웨이트(143)는 부채꼴을 이루고, 상기 선회스크롤(120)의 회전시 발생하는 그 중량으로 언밸런스를 교정한다.The coupling hole 142 also has a shape corresponding to the cross section of the crank pin 114 '

', and the balance weight 143 is extended in the receiving part 141 of the sliding bush 140, and the balance weight 143 has a sector shape, which occurs when the orbiting scroll 120 rotates. Correct unbalance with weight.

In addition, it is preferable that an insertion part 122 inserted into the receiving part 141 of the sliding bush 140 is formed on one surface of the orbiting scroll 120 .

Here, the crankpin 114 is inclined counterclockwise by a corresponding angle based on a vertical line orthogonal to the center line. The inclination of is formed to be inclined counterclockwise by the corresponding angle.

In more detail, an imaginary line A passing through the center of the balance weight 143 of the sliding bush 140, an imaginary line B passing through the center of the crankpin 114, and a crank parallel to the imaginary line B It is preferable to form an extended line B' extending from the flat surface 115 on one side of the pin 114, and the angle between the imaginary lines A-B' is inclined counterclockwise by the corresponding angle, more preferably It is preferable that the inclination angle of the through hole 142 of the sliding bush 140 be formed to be 30° or more and 40° or less based on the imaginary line A passing through the center of the balance weight 143 of the sliding bush 140. .

5 is a graph showing the noise evaluation results according to the crankpin angle.

Therefore, the electric scroll compressor having the above configuration has an angle between the rotary shaft of the electric motor and the crankpin insertion hole of the sliding bush of 30° or more and 40° or less, thereby reducing the force transmitted from the motor to the orbiting scroll and reducing the load applied to the compressor. With the reduction, the power consumption is reduced, the durability of the compressor is improved, and the driving noise of the compressor is reduced.

Although the present invention has been described with reference to the embodiment shown in the drawings, which is merely exemplary, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100: electric scroll compressor
110: housing
111: rotor
112: stator
113: rotation shaft
114: crankpin
115: flat plane
120: orbiting scroll
121: turning wrap
130: fixed scroll
131: fixed wrap
140: sliding bush
141: receptacle
142: through hole
143: balance weight
200: discharge cap

Claims (4)

a housing in which a rotor and a rotating shaft are disposed at an inner center, a stator is configured to be spaced apart from the outside of the rotor, and the rotor and the rotating shaft rotate by an electromagnetic induction action of the stator;
a revolving scroll built into the housing, having a revolving wrap formed on one side thereof, connected to one end of the rotary shaft at an opposite side thereof, and performing revolving motion as the rotor rotates;
A fixed scroll having a fixed lap coupled to the housing and facing the orbiting scroll built in the housing, having a compression chamber corresponding to the orbiting lap of the orbiting scroll, which compresses and discharges the incoming refrigerant. ;
a discharge cap coupled to the rear surface of the fixed scroll and having a discharge chamber accommodating the refrigerant discharged from the fixed scroll on an inner side adjacent to the fixed scroll; and
A sliding bush coupled to a crankpin extending from the rotation shaft toward the orbiting scroll and having one surface in close contact with the orbiting scroll; includes,
The crankpin to which the sliding bush is coupled has a flat surface perpendicular to a longitudinal direction of the crankpin, and the flat surface is inclined in a counterclockwise direction.
The method according to claim 1,
A plurality of flat surfaces of the crankpins are formed in an electric scroll compressor.
3. The method according to claim 2,
The coupling hole to which the crankpin is coupled among the sliding bushes is
An electric scroll compressor having an inclination while forming a shape corresponding to the vertical cross-sectional shape of the crankpin.
3. The method according to claim 2,
The tilt angle of the crankpin is
An imaginary line A passing through the center of the balance weight of the sliding bush,
an imaginary line B passing through the center of the crankpin;
an extension line B' extending from the flat surface of one side of the crankpin parallel to the imaginary line B;
An electric scroll compressor in which the angle between the imaginary lines AB' is not less than 30° and not more than 40°.

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