KR20140030566A - Scroll compressor - Google Patents

Abstract

The present invention relates to a scroll compressor which presses the refrigerant trapped inside the compression chamber as the volume of the chamber decreases by the relative rotation of a fixed scroll and an orbiting scroll. The scroll compressor according to an embodiment of the present invention is capable of reducing the off noise by deforming the form of the contacting portion of an eccentric bush which hits the rotation axis when the compressor in operation stops.

Description

[0001] SCROLL COMPRESSOR [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a compressor, and more particularly, to a scroll compressor in which impact noise generated by contact between an eccentric bush and a rotating shaft is reduced when the compressor stops operating.

Generally, compressors that serve to compress refrigerant in automotive cooling systems have been developed in various forms. Such a compressor includes a reciprocating type in which compression is performed while a refrigerant is compressed and a rotary type in which compression is performed while rotating.

Here, the reciprocating type includes a crank type in which the driving force of the driving source is transmitted by a crank to a plurality of pistons, a swash plate type in which the swash plate is transmitted, and a wobble plate type in which a wobble plate is used. And a vane rotating seat type using a vane, and a scroll type using a revolving scroll and a fixed scroll.

The scroll compressor is provided with a drive unit, a compression unit, and a control unit inside a housing that forms an appearance, and the inner space of the housing is divided into a suction chamber, a compression chamber, a discharge chamber, and a back pressure chamber.

In this case, the driving unit includes a stator and a rotor mounted coaxially inside the housing, and a rotating shaft installed through the stator, and the control unit includes various driving circuits and elements such as a PCB mounted on the inside of the housing. do.

The suction chamber is a space in which the refrigerant sucked from the outside of the housing is stored. The compression chamber is a space in which the refrigerant sucked into the suction chamber is compressed. The discharge chamber is a space in which compressed refrigerant is discharged from the compression chamber. In the fixed scroll direction.

1 shows an example of a scroll compressor compression unit shown in Japanese Unexamined Patent Application Publication No. 2012-67602 (Patent Document 1). As shown in Fig. 1, a compression unit is fixed to one side of a housing A scroll 10 and an orbiting scroll 11 which forms a compression chamber 15 by engaging with the fixed scroll 10 while being eccentrically rotated by a driving portion.

At this time, the orbiting scroll 11 is eccentrically coupled to the eccentric shaft 8a of the rotary shaft 8 by the bush 12 and the bearing 13, and between the bush 12 and the rotary shaft 8, A balance weight 19 is integrally formed with the bush 12 to balance the eccentric rotation.

In order to prevent breakage of the orbiting scroll 11 due to the liquid refrigerant compression during the initial operation of the orbiting scroll 11, a constant rotation tolerance is provided between the inner peripheral surface of the balance weight 19 and the outer peripheral surface of the rotary shaft 8, So that the rotational motion of the bush 8 is transmitted immediately to the bush 12 in a buffered manner according to the designed rotational tolerance.

When the compressor is stopped, the inner edge portion of the balance weight 19 strongly hits the outer circumferential surface of the rotary shaft 8, And there is a need to reduce such an impact sound in order to improve the sensitivity quality.

Patent Document 1: Japanese Unexamined Patent Application Publication No. 2012-67602 (published Apr. 05, 2012)

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and one embodiment of the present invention is to provide a compressor which can reduce the off- The scroll compressor according to claim 1,

According to a preferred embodiment of the present invention, there is provided a refrigerator comprising: a housing having a suction port for sucking refrigerant and a discharge port for supplying compressed refrigerant to the outside; A fixed scroll installed at one side of the inside of the housing and having a discharge port formed at the center thereof; A drive motor mounted to the other inside of the housing and provided with a rotating shaft; An eccentric bush coupled to one end of the rotary shaft and having an incision for reducing an impact sound at one side edge of the inner side facing the outer circumferential surface of the rotary shaft; And an orbiting scroll having one side connected to the eccentric bush and revolving with respect to the fixed scroll and forming a plurality of compression chambers in the housing together with the fixed scroll.

Here, the eccentric bush has a curved surface at one side so as to surround one side of the outer circumferential surface of the rotating shaft, and a cut at one side edge of the curved surface.

At this time, it is preferable that the thickness of the uncut portion remaining at one corner of the curved surface is 1 mm to 4 mm.

Further, the cut-out portion may be formed by chamfering or filleting.

The eccentric bush includes a coupling portion coupled to one end of the rotation shaft, a bushing protruding from one surface of the coupling portion and eccentrically coupled to one side of the orbiting scroll, and a bushing having one side of the outer peripheral surface of the rotation shaft And the cutout portion is formed at both side edges of the inner circumferential surface of the weight portion.

In the scroll compressor according to an embodiment of the present invention, when the compressor stops operating in the eccentric bush, a part of the edge of the weight portion striking the outer circumferential surface of the rotary shaft is cut, thereby reducing off- The sensibility quality is improved.

1 is a cross-sectional view schematically showing a compression section of a conventional scroll compressor;
2 is a cross-sectional view of a scroll compressor according to an embodiment of the present invention.
3 is a perspective view of an eccentric bush according to an embodiment of the present invention;
4 is a perspective view of an eccentric bush according to another embodiment of the present invention;

Hereinafter, a preferred embodiment of the scroll compressor of the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

In addition, the following embodiments are not intended to limit the scope of the present invention, but merely as exemplifications of the constituent elements set forth in the claims of the present invention, and are included in technical ideas throughout the specification of the present invention, Embodiments that include components replaceable as equivalents in the elements may be included within the scope of the present invention.

Example

2 is a cross-sectional view of a scroll compressor according to an embodiment of the present invention.

Scroll compressor (hereinafter, 'compressor') according to an embodiment of the present invention, the housing 200 is formed in a substantially hollow cylindrical shape, the fixed scroll 300 is installed on one side of the inside of the housing 200 ), A drive motor 400 installed on the other side of the housing 200, an eccentric bush 500 coupled to one end of the rotation shaft 421 of the drive motor 400, and one side of the eccentric bush 500. It includes a swing scroll 600 coupled to revolve about the fixed scroll (300).

The housing 200 includes a drive housing 210 and a drive housing 210. The drive housing 210 has a drive motor 400 and a suction port (not shown) formed on one side of the outer periphery of the compressor 200, And a discharge port connected to a rear portion of the drive housing 210 and having a compressed refrigerant discharged from the discharge port 210. The head housing 220 includes an inverter 221 for controlling the drive motor 400, And a cover housing 230 provided with a cover (not shown).

In this case, the shape of the driving unit housing 210, the head housing 220, and the cover housing 230 may be variously modified, and the entire housing 200 may also be formed in various configurations.

For example, as shown in FIG. 2, the driving unit housing 210 may include two parts: a front housing 211 and a rear housing 212 that are opposed to each other. Alternatively, the driving housing 210 may include a front housing 211, The drive housing 210 and the cover housing 230 or the drive housing 210 and the head housing 220 may be formed integrally with each other.

A space portion is formed inside the driving unit housing 210, and a driving motor 400 is mounted in the space portion. The drive motor 400 includes a stator 410 and a rotor 420. The stator 410 has a cylindrical shape with a center penetrated therein and is stator core fixedly mounted to the inner circumferential surface of the drive unit housing 210 by press fitting. 411 and a bundle of coils 412 wound around the stator core 411.

In addition, the rotor 420 is coaxially mounted to the inside of the stator 410 and driven to rotate, and is inserted into the center through hole of the stator core 411 so as to be rotatably disposed along the center axis. ) And a permanent magnet 422 attached to the outer circumferential surface of the rotary shaft 421.

Therefore, when a current flows through the coil 412 wound around the stator core 411, a magnetic field is formed in the stator coil 412, and the stator 410 and the permanent magnet 422 are interacted with each other according to the driving principle of the motor. The rotating shaft 421 is driven to rotate.

At this time, the first bearing receiving portion 214 is fixed to the bottom surface of the front housing 211, the first bearing 213 is fixed, the second bearing 215 is formed on the bottom surface of the rear housing 212 The second bearing receiving portion 216 fixedly installed is protruded, the front end of the rotation shaft 421 of the drive motor 400 is rotatably supported by the first bearing 213, the rear end of the second bearing 215 Is rotatably supported.

Although not shown, a suction port is formed at one side of the outer circumferential surface of the driving housing 210 so that the refrigerant can be sucked in. The refrigerant sucked into the space in the driving housing 210 through the suction port is introduced into a compression chamber 700, and is supplied to the outside through the discharge port.

Head housing 220 is coupled to the front of the drive housing 210, the inside is provided with an inverter 221 for converting the DC power into AC power, the inverter 221 is a rotational speed of the drive motor 400 By controlling the rotational speed of the driving motor 400, the amount of refrigerant is controlled to be controlled, so that the interior of the vehicle can be maintained at a desired temperature.

A cover housing 230 having a discharge port is coupled to one side of the outer circumferential surface of the driving housing 210 and a fixed scroll 300 and a orbiting scroll 600 are installed in the cover housing 230.

The fixed scroll 300 is fixed to one side of the cover housing 230 and the orbiting scroll 600 is installed on the other side of the cover housing 230 so as to face the fixed scroll 300. The orbiting scroll 300 600 are eccentrically joined to one end of the rotary shaft 421 by the eccentric bush 500 and rotate about the fixed scroll 300 when the rotary shaft 421 rotates.

The fixed scroll 300 includes a fixed end plate 310 in the form of a disk and a fixed lap 320 protruding from a surface of the fixed end plate 310 so as to converge toward the center, And a swirling wrap 620 protruding from the one side of the swinging end plate 610 so as to be converged toward the center so as to face the stationary wrap 320.

At this time, as the fixed wrap 320 and the swing wrap 620 abuts at a plurality of points, the space between the fixed wrap 320 and the swing wrap 620 is partitioned into a plurality of compression chambers 700, turning scroll The fixed scroll 300 and the revolving scroll 600 which are mutually matched when the 600 is revolved are fixed by the fixed wrap 320 and the revolving wrap 620 by the relative rotation of the fixed wrap 320 and the revolving wrap 620. Compresses the refrigerant sucked into the outer edge portion of the c) to the central portion thereof, and discharges the refrigerant sucked into the high pressure chamber 231 in the cover housing 230 through the discharge hole 311 formed in the center of the fixed scroll 300, the high pressure chamber 231 Refrigerant is supplied to the outside through the oil separator (not shown) through the discharge port.

A back pressure chamber 800 is formed between one surface of the orbiting end plate 610 facing the rotating shaft 421 and one end of the rotating shaft 421. More specifically, The orbiting scroll 600 is formed by the pressure of the back pressure chamber 800 and is pushed toward the fixed scroll 300. The pressure of the back pressure chamber 800 is applied to the fixed scroll 300, do.

At this time, the refrigerant compressed at the high pressure in the compression chamber 700 contains lubricating oil, and the oil is recovered while passing through the oil separator before being supplied to the outside through the discharge port. The recovered oil is discharged to the decompression device (Not shown) in the direction of the drive motor 400 to lubricate the second bearing 215. Thereafter, the refrigerant flows into the compression chamber 700 together with the refrigerant to lubricate the fixed scroll 300 and the orbiting scroll 600, and a part of the refrigerant is guided to the back pressure chamber 800 together with the refrigerant while passing through the compression chamber 700. [ The lubrication of the internal components of the back pressure chamber 800 is performed.

FIG. 3 is a perspective view of an eccentric bush according to an embodiment of the present invention, and FIG. 4 is a perspective view of an eccentric bush according to another embodiment of the present invention.

3 and 4, the eccentric bush 500 according to an embodiment of the present invention includes a coupling portion 510 in the form of a disk coupled to one end of the rotation shaft 421, A bush 520 protruding from one surface of the orbiting scroll 600 and eccentrically joined to one side of the orbiting scroll 600 and a bush 520 protruding from one surface of the orbiting scroll 600 and eccentrically joined to one side of the orbiting scroll 600, And a weight portion 530 formed thereon. At this time, both sides of the coupling portion 510 are connected to the weight portion 530 in a round manner.

When the eccentric bush 500 and the orbiting scroll 600 are coupled to each other, the bush 520 is supported by the support bearing 521 An eccentric shaft (not shown) extending from one side of the orbiting scroll 600 passes through the eccentric hole 522 and is inserted into the rotation shaft 421. The eccentric hole 522 is formed with a through-

In addition, the inner circumferential surface of the weight portion 530 is formed of a semicircular curved surface 531 to surround one side of the outer circumferential surface of the rotation shaft 421. In the initial driving of the 100, the rotational tolerance d is maintained to prevent damage of the turning scroll 600 due to the liquid refrigerant compression.

When the compressor 100 is stopped during operation, the rotation axis 421 is suddenly braked from several thousands rpm to 0 rpm. At this time, due to the rotation tolerance d, one edge of the curved surface 531 of the weight portion 530 is rotated by the rotation axis 421 So that an impact sound is generated.

In an embodiment of the present invention, in order to reduce such an impact sound as close to a dark noise level, as shown in an enlarged view of FIG. 2, a cut portion 532 is formed at one side edge of a curved surface of the weight portion 530 do. Preferably, cutaway portions 532 are formed at both side edges of the curved surface of the weight portion 530.

In order to prevent breakage of the orbiting scroll 600, a rotation tolerance d must be maintained between both side edges of the curved surface 531 and the outer peripheral surface of the rotary shaft 421. For this purpose, And the remaining non-cut portion 533 is required to maintain the rotation tolerance d with the outer circumferential surface of the rotation shaft 421.

At this time, the thickness of the non-incision portion 533 is preferably 1mm to 4mm, if the thickness of the non-incision portion 533 is less than 1mm rotational tolerance is not guaranteed, the thickness of the non-incision portion 533 is 4mm If it is larger than the noise reduction effect is difficult to see.

3, the cutout portion 532 may be formed by chamfering a flat surface 534, or may be formed by a fillet machining process, such as the eccentric bushing 500 'shown in FIG. 4, May be formed.

4 shows an example in which rounded surfaces 535 are formed in both sides of the curved surface 531 in the direction of the rotation axis 421 by fillet machining. On the other hand, on both sides of the curved surface 531, Of course, the round surface can be filletted. In addition, the specification such as the width of the cutout portion 532 can be appropriately selected in consideration of the rotation rpm and the rotation tolerance of the rotation axis 421.

100: scroll compressor
200: housing
300: Fixed scroll
400: drive motor
500,500 ': Eccentric Bush
510:
520: Bush
522: Eccentric hole
530:
532: incision
600: Turning scroll

Claims (5)

A housing (200) having a suction port for sucking refrigerant and a discharge port for supplying compressed refrigerant to the outside;
A fixed scroll (300) installed at one side of the inside of the housing (200) and having a discharge port (311) formed at the center thereof;
A drive motor 400 mounted on the other side of the housing 200 and provided with a rotation shaft 421;
An eccentric bushing 500 coupled to one end of the rotary shaft 421 and having a cutout 532 formed at one side edge of the inner side opposite to the outer peripheral surface of the rotary shaft 421 for reducing impact noise; And
And a plurality of compression chambers 700 formed in the housing 200 together with the fixed scroll 300 and coupled to one side of the eccentric bush 500 to revolve with respect to the fixed scroll 300, 600). ≪ / RTI >
The eccentric bush according to claim 1, wherein the eccentric bushing (500)
Wherein a curved surface (531) is formed at one side so as to surround one side of the outer circumferential surface of the rotary shaft (421), and a cutout (532) is formed at one side edge of the curved surface (531).
The method according to claim 2,
And the thickness of the non-cut portion (533) cut at one side edge of the curved surface (531) is 1 mm to 4 mm.
The method according to claim 1,
Wherein the cut-out portion (532) is formed by chamfering or filleting.
The method according to claim 1,
The eccentric bush 500 includes an engaging portion 510 coupled to one end of the rotary shaft 421 and a bushing 510 protruding from one surface of the engaging portion 510 and eccentrically coupled to one side of the orbiting scroll 600, And a weight portion 530 formed to surround one side of the outer circumferential surface of the rotary shaft 421 from the other surface of the coupling portion 510. The cutout portion 532 is formed at a side of the weight portion 530 And is formed on both side edges of the inner peripheral surface.

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