KR100393565B1 - Asymmetric scroll compressor - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to scroll compressors, and more particularly, to an asymmetrical scroll compressor that is capable of preventing the compression performance from being degraded due to machining and assembly errors by cutting some sections of the wrap on the suction side of the fixed scroll or swing scroll.

As such, the present invention relates to the involute end angle of the wrap of the fixed scroll ( Involute end angle of the lap of this turning scroll ( In the asymmetrical scroll compressor, which extends by an angle more than), the wrap of the fixed scroll has an extension ( The inner surface of the c) is offset by a predetermined amount so as to form a gap without being in contact with the wrap of the pivoting scroll.

Description

Asymmetric scroll compressor

TECHNICAL FIELD The present invention relates to a scroll compressor, and more particularly, to an asymmetrical scroll compressor, in which a part of the wrap on the suction side of a fixed scroll or swinging scroll is offset to prevent the compression performance from being degraded due to machining and assembly errors. will be.

1 is an internal configuration diagram showing a symmetrical scroll compressor of the prior art, and FIG. 2 is a schematic top view of a symmetrical scroll structure.

In the general symmetrical scroll compressor, the main frame 20 and the sub frame 25 are respectively installed on the upper and lower sides of the sealed case 1, and the compression unit for compressing and discharging the refrigerant gas on the upper part of the main frame 20. 10 is positioned, and the motor unit 30 for driving the compression unit 10 is located between the main frame 20 and the sub frame 25.

The motor unit 30 has a current applied to the stator 31 so that the flow electricity is generated so that the inner rotor 33 rotates, and the drive shaft 35 is press-fitted to the center of the rotor 33. The drive shaft 35 is rotated to operate the compression unit 10.

The compression unit 10 includes a fixed scroll 11 having an involute wrap 11a and a pivoting scroll 15 having an involute wrap 15a having a phase difference of 180 degrees with the involute curve. The compression chamber (C) is formed by engaging to face each other.

In the symmetrical scroll compressor configured as described above, when power is applied to the stator 31 of the motor unit 30, the rotor 33 rotates to rotate the drive shaft 35, and the drive shaft 35 rotates the scroll ( 11) is rotated eccentrically by the eccentric distance.

At this time, the pivoting scroll 11 is pivoted at a distance away from the axis center by the turning radius 17 by the pivot radius.

As the turning scroll 11 performs the turning motion as described above, a compression chamber C is formed between the wrap 11a of the swing scroll 11 and the wrap 15a of the fixed scroll 15, and this compression chamber C ) Is moved to the center by continuous turning movement, the volume decreases and the pressure rises so that the refrigerant gas is discharged through the discharge port 18, and the discharged gas is discharged through the discharge pipe 19 through the discharge chamber. .

On the other hand, Figure 3 is a plan view showing the asymmetric scroll structure of the prior art.

Prior art asymmetric scrolls have the involute end angle of the wrap 15 'of the fixed scroll in the symmetrical scroll structure described above. ) The involute end angle of the lap (11 ') of the turning scroll ( As a compression chamber is extended by 180 °, the suction capacity can be increased by 10% or more with the inner diameter of the same frame as compared with the symmetrical scroll structure.

Unlike the symmetrical scroll, the asymmetrical scroll has only one suction part, and there is no suction flow path returning to the outer circumference of the turning scroll, so there is little overheating of the suction gas, so the volumetric efficiency is higher than that of the symmetrical scroll structure. In addition, compared to the symmetrical scroll structure has an advantage of smaller than 1/2.

However, the asymmetrical scroll of the prior art as described above has the outer involute section of the wrap 11 'of the swivel scroll not used as the compression space in the symmetrical scroll structure. To ') As the compression space, and the involute end angle of the fixed scroll wrap (15') Since the ') is lengthened up to 180 ° compared to the symmetrical scroll structure, there is a problem in that the leakage point causing the leakage of the fluid to be compressed increases.

That is, as shown in FIG. 4, when the wrap 11 ′ of the revolving scroll generates an error against the ideal involute curve due to machining and assembly errors, the outermost leakage point having a low pressure as shown in FIG. 5 ( ) Can come into contact with the fixed scroll 15 'to prevent leakage. , ) Is the cause of gaps, resulting in deterioration of compression efficiency, causing scattering.

In addition, the asymmetrical scroll of the prior art pushes the wrap 11 'of the orbiting scroll to the wrap 15' of the fixed scroll by a radially compliant structure to prevent radial leakage. , , Due to the imbalance of), the impact between the two scrolls is generated, which also causes a problem that the dispersion of noise becomes larger than the symmetrical scroll structure.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and by processing a fixed part of the contact surface of the suction side of the fixed scroll and the revolving scroll by offsetting a predetermined portion (compression), the compression efficiency is lowered due to the processing and assembly error of the scroll, and the noise is increased. It is to provide an asymmetrical scroll compressor that can increase the compression efficiency and reduce the noise generated by preventing the problem.

1 is a cross-sectional view showing a scroll compressor of the prior art,

2 is a cross-sectional view showing the wrap of a symmetrical scroll in a prior art scroll compressor;

3 is a cross-sectional view showing a wrap of an asymmetrical scroll in a prior art scroll compressor;

4 is a reference diagram of the shape of the wrap of the scroll due to machining error in the asymmetrical scroll of the prior art,

5 is a reference diagram of gap generation caused by machining error in the asymmetrical scroll of the prior art,

6 is a cross-sectional view of the asymmetrical scroll compressor according to the present invention;

7A is a plan sectional view and detail view of a wrap of an asymmetrical scroll of a first embodiment according to the present invention;

FIG. 7B is a partially enlarged cross-sectional view of FIG. 7A;

8A is a plan sectional view and detail view of a wrap of an asymmetrical scroll of a second embodiment according to the present invention;

8B is a partially enlarged cross-sectional view of FIG. 8A;

9 is a partial cross-sectional view of a wrap of an asymmetrical scroll of a third embodiment according to the present invention.

<Explanation of symbols for the main parts of the drawings>

51: sealed case 55: motor unit

60: compression unit 61: fixed scroll

61a: wrap 61b: offset machining

65: Turning Scroll 65a: Lap

65b ': offset processing part

An asymmetrical scroll compressor according to the present invention for realizing the above object is an asymmetrical scroll compressor in which the involute end of the lap of the fixed scroll extends at an angle than the involute end of the lap of the swinging scroll, the extended portion of the lap Is the angle between the involute end of the lap of the orbiting scroll and the involute start angle. If la from Extending within the angular range below, wherein the wrap of the fixed scroll is configured such that the inner surface of the wrap of the extended portion is offset by a predetermined amount to form a gap without contacting the wrap of the pivoting scroll. It becomes possible.

In addition, the asymmetrical scroll compressor according to the present invention for realizing the above object is, in the asymmetrical scroll compressor in which the involute end of the wrap of the fixed scroll extends by an angle than the involute end of the wrap of the swinging scroll, the extension of the wrap Where the involute end of the lap of the slewing scroll is from the involute start angle. If la from The lap of the swinging scroll extends within the following angular range, and the outer surface of the lap corresponding to the lap of the extended portion of the fixed scroll is offset by a predetermined amount so that the gap does not come into contact with the lap of the fixed scroll. Characterized in that it is configured to form.

In addition, the asymmetrical scroll compressor according to the present invention for realizing the above object is, in the asymmetrical scroll compressor in which the involute end of the lap of the fixed scroll is extended by a predetermined angle than the involute end of the lap of the swinging scroll, the extension of the lap Where the involute end of the lap of the slewing scroll is from the involute start angle. If la from Extending within the following angular range, wherein the wrap of the fixed scroll has an inner side of the wrap of the extended portion offset by an amount, and the wrap of the turning scroll is a wrap of the extended portion of the wrap of the fixed scroll. The outer surface corresponding to is offset by a predetermined amount so that the wrap of the extended portion of the fixed scroll is configured to form a predetermined gap without being in contact with the wrap of the swinging scroll.

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

6 is a cross-sectional view of the compressor of the asymmetrical scroll according to the present invention, and FIGS. 7A and 7B are a plan sectional view and a detailed view showing the shape of the wrap of the asymmetrical scroll of the first embodiment according to the present invention.

In the asymmetric scroll compressor according to the present invention, a compression unit 60 for compressing and discharging refrigerant gas is positioned above the main frame 52 of the hermetic case 51, and between the main frame 52 and the subframe 53. In the motor unit 55 for driving the compression unit 60 is located.

Here, the compression unit 60 is a fixed scroll 61 having an involute wrap 61a and 65a and a pivoting scroll 65 are engaged with each other to form a compression chamber C. The wrap of the fixed scroll Involute end angle of (61a) ) Is the involute end angle of the wrap 65a of the turning scroll ( It is formed 180 ° longer than).

From above Represents the angle formed by the involute end of the lap from the involute start angle of the lap of the fixed scroll, Is the angle formed by the involute end of the lap from the involute start angle of the lap of the turning scroll.

That is, the involute end angle of the wrap 61a of the fixed scroll ( = Involute end angle of the lap 65a of this turning scroll ( Asymmetric extension (180 ° longer than) Is formed to have one suction unit between the fixed scroll 61 and the wraps 61a and 65a of the swinging scroll 65.

In particular the asymmetrical extension of the wrap 61a of said fixed scroll ( Inside of the Cutting, that is, an offset machining portion 61b is formed so as to form a predetermined gap without being in contact with the turning scroll 65.

The wrap 61a of the fixed scroll is formed to be relatively thinner than the thickness of the portion of the wrap 61b in which the offset machining portion 61b is not formed.

In the above, the offset processing portion 61b preferably cuts a thickness of about 20-50 μm, and the asymmetric extension portion of the wrap 61a of the fixed scroll ( The whole section of) can be cut or processed by cutting only a few sections.

Accordingly, as the offset machining unit 61b is formed in the wrap scroll 61a of the fixed scroll, the outermost leakage point S3 of the three leakage points S1, S2, and S3 is compressed during the compression process as shown in FIG. 7A. The offset machining portion 61b does not come into contact with the wrap 65a of the revolving scroll.

As a result, the gap between the fixed scroll 61 and the laps 61a and 65a of the swing scroll 65 is generated to the outermost leak point S3 among the three leak points S1, S2, and S3. Leakage points (S1, S2) at the center of the pressure difference, which are relatively large, do not generate a gap, and thus the compression efficiency can be improved accordingly.

Fig. 8 is a plan sectional view and detail view showing the shape of the wrap of the asymmetrical scroll of the second embodiment according to the present invention.

In the first embodiment described above, the asymmetric extension of the wrap of the fixed scroll ( Offset machining portion is formed on the inner side of the () but in the second embodiment of the present invention the asymmetrical extension of the fixed scroll (61 ' The offset machining part 65b 'is formed in the outer surface of the lap 65a' of the turning scroll corresponding to).

As the outer surface of the lap 65a 'of the revolving scroll is offset by a predetermined amount to form an offset machining portion 65b', the inner surface of the lap 61a of the fixed scroll is formed as in the first embodiment. It is possible to form a certain gap without contact.

Here, the offset processing portion 65b 'of the wrap 65a' of the revolving scroll has an asymmetrical extension of the fixed scroll 61 '( Only all sections or a partial section of the outer surface corresponding to) are cut and processed.

In the second embodiment of the present invention, like the first embodiment described above, the lap 65a 'of the turning scroll which is the outermost leakage point S3 among the three leakage points S1, S2, and S3 in FIG. 8A. Of the offset machining portion 65b 'does not come into contact with the inner surface of the wrap 61a' of the fixed scroll, so that the leak points S1 and S2 at the center of relatively large pressure difference do not have a gap.

9 is a plan sectional view showing an asymmetrical scroll structure of a third embodiment according to the present invention.

In the first and second embodiments, an offset machining portion is formed on either of the fixed scroll and the lap of the swing scroll, but in the third embodiment of the present invention, the lap 61a "of the fixed scroll and the lap 65a of the swing scroll are formed. Offset machining portions 61b " and 65b " are formed on the mutually corresponding surfaces of "

That is, the wrap 61a "of the fixed scroll has its asymmetrical extension ( ), The inner surface of the slit is cut by a certain amount to form an offset machining portion 61b ", and the lap 65a" of the turning scroll also corresponds to the offset machining portion 61b "of the lap 61a" of the fixed scroll. As the offset machining portion 65b "is formed on the outer side surface, the outermost leakage point of the lap 61a" of the fixed scroll and the lap 65a "of the revolving scroll can form a predetermined gap without contacting each other.

Here, the offset processing portions 61b "and 65b" of the wrap of the fixed scroll and the swing scroll are each an asymmetric extension portion ( It is preferable that only all the sections or a part of the sections) are removed and processed, and are formed to be relatively smaller than the offset amount of the first and second embodiments.

As described above, the asymmetrical scroll compressor of the present invention is configured to maintain a constant clearance by cutting a predetermined amount near the outermost leakage point of the wrap of the fixed scroll or the swinging scroll so that a clearance does not occur at the leakage point of the center side, so that the processing and assembly are possible. There is an advantage that can reduce the noise generated at the same time to prevent the compression efficiency due to the error.

Claims (7)

In an asymmetrical scroll compressor in which the involute end of the lap of a fixed scroll extends at an angle than the involute end of the lap of a rotating scroll, The extended portion of the lap is the angle formed by the involute end of the lap of the swivel scroll from the involute start angle. If la from Extends within the following angle ranges, And the wrap of the fixed scroll is configured such that an inner surface of the wrap of the extended portion is offset by a predetermined amount to form a gap without contacting the wrap of the orbiting scroll. In an asymmetrical scroll compressor in which the involute end of the lap of a fixed scroll extends at an angle than the involute end of the lap of a rotating scroll, The extended portion of the lap is the angle formed by the involute end of the lap of the swivel scroll from the involute start angle. If la from Extends within the following angle ranges, The lap of the pivoting scroll is asymmetrical scroll, characterized in that the outer surface of the lap corresponding to the lap of the extended portion of the fixed scroll is offset by a certain amount to form a gap without contacting the lap of the fixed scroll. compressor. In an asymmetrical scroll compressor in which the involute end of the lap of a fixed scroll extends at an angle than the involute end of the lap of a rotating scroll, The extended portion of the lap is the angle formed by the involute end of the lap of the swivel scroll from the involute start angle. If la from Extends within the following angle ranges, The lap of the fixed scroll is offset by a certain amount on the inner side of the lap of the extended portion, and the lap of the pivoting scroll is cut by a certain amount on the outer surface corresponding to the lap of the extended portion of the lap of the fixed scroll. (offset) such that the wrap of the extended portion of the fixed scroll is configured to form a gap without being in contact with the wrap of the swinging scroll. delete The method according to claim 1 or 3, The wrap of the extended portion of the fixed scroll is asymmetrical scroll compressor, characterized in that only a portion of the offset (offset). The method of claim 2 or 3, The lap corresponding to the lap of the extended portion of the fixed scroll of the lap of the swing scroll is offset only a portion (offset). The method according to any one of claims 1 to 3, The cutting thickness of the wrap is asymmetrical scroll compressor, characterized in that 20 to 50㎛.