KR20120081489A - Scroll compressor with split type orbitting scroll - Google Patents

Abstract

PURPOSE: A scroll compressor equipped with a separable rotation scroll is provided to minimize the damage of worked portions and reduce working time by separating a rotation lap and a bearing plate by working the two parts independently. CONSTITUTION: A scroll compressor equipped with a separable rotation scroll comprises a case(1), a fixed scroll(4), a lap unit(50), a base unit(60), a drive motor, a mainframe, and a rotation prevention structure. The lap unit and the fixed scroll form a compressing room by being meshed with each other. The base unit coupled with the lap unit. The drive motor rotates the base unit and the lap unit eccentrically. The mainframe is installed in the case and supports the base. The rotation prevention structure prevents the rotation of the lap unit and the base unit by being coupled with one of the base unit and the lap unit.

Description

SCROLL COMPRESSOR WITH SPLIT TYPE ORBITTING SCROLL}

The present invention relates to a scroll compressor having a separate swing scroll, and more particularly to a scroll compressor in which the swing scroll is rotated with respect to the fixed scroll.

Generally, a scroll compressor is a compressor which compresses refrigerant gas by changing the volume of the compression chamber formed by a pair of opposing scrolls. Scroll compressors are more efficient than reciprocating compressors or rotary compressors, have low vibration and noise, are compact and lightweight, and thus are widely used in air conditioners.

The scroll compressor may be classified into a low pressure type and a high pressure type according to the type of refrigerant supplied to the compression chamber. That is, in the low pressure scroll compressor, the refrigerant is indirectly sucked into the compression chamber through the inner space of the casing, and the inner space of the casing is divided into the suction space and the discharge space. On the other hand, in the high pressure scroll compressor, the refrigerant is directly supplied to the compression chamber without passing through the inner space of the casing and then discharged into the inner space of the casing, and the entire inner space of the casing is a discharge space.

The scroll compressor may also be classified into a tip seal method and a back pressure method by a sealing method of a compression chamber. That is, the tip seal method is a method in which a tip seal is installed at the lap end of each scroll so that the tip seal floats while the compressor is in operation and is in close contact with the hard plate portion of the opposite scroll. On the other hand, in the back pressure method, a back pressure chamber is formed on the rear surface of one scroll and the oil or refrigerant of medium pressure is induced in the back pressure chamber so that the scroll is pressed against the opposite scroll by being pushed by the pressure in the back pressure chamber. Generally, the tip seal method is applied to a low pressure scroll compressor, while the back pressure method is applied to a high pressure scroll compressor.

On the other hand, the rotating shaft of the drive motor is coupled to one side of the turning scroll, the other side is formed with a wrap engaging the fixed scroll. In particular, in the case of the turning scroll, both sides are rotated in contact with the fixed scroll and the main frame, respectively, and thus, it is necessary to precisely process the shape in order to suppress vibration and minimize the loss due to friction. To this end, the turning scroll is to process the wrap portion after the machining of the bearing surface in contact with the main frame, due to this there is a risk that the bearing surface is damaged in the process of the longer working time and the wrap portion. In addition, since the shape of the swing scroll and the fixed scroll, in particular the shape and size of the wrap portion according to the capacity of the compressor to be different, it takes a considerable time to design and manufacture the swing scroll.

The present invention has been made to overcome the disadvantages of the prior art as described above, the technical problem is to provide a scroll compressor that can facilitate the manufacture of the scroll scroll.

According to an aspect of the present invention for achieving the above technical problem, a case; A fixed scroll installed in the case; A wrap part engaged with the fixed scroll to form a compression chamber; A base portion coupled to the wrap portion; A driving motor coupled to a rear surface of the base part to eccentrically rotate the base part and the wrap part; A main frame supporting the base part and installed in the case; And an anti-rotation mechanism coupled to any one of the base portion and the wrap portion to prevent rotation of the wrap portion and the base portion.

In the above aspect of the present invention, the rotating scroll, which is formed integrally with the prior art, is configured to be separated into the wrap portion and the base portion, so that the wrap portion and the base portion can be manufactured separately. Through this, the base part can be shared by many compressors of different capacities, thereby making it easier to manufacture the turning scroll.

Here, the wrap portion and the base portion may be fastened in any manner, such as bolt fastening, for example, the wrap portion and the base portion may be keyed. In this case, keyholes are formed at both sides of the wrap portion and the base portion, and a key is inserted to engage each of them, or a key is integrally formed at any one of the wrap portion and the base portion, and a keyhole to which the key is coupled to the other side is formed. It may be formed.

A plurality of keys may be formed, and a plurality of keys may be disposed radially on either side of the wrap part and the base part.

On the other hand, the base portion is a boss coupled to the rotating shaft of the drive motor; And a base flange facing the wrap portion. In this case, the anti-rotation mechanism may use an old dam ring interposed between the base flange and the main frame.

Specifically, the anti-rotation mechanism is a ring-shaped portion; A first protrusion formed on a bottom surface of the ring shape and coupled to the main frame; And a second protrusion formed on an upper surface of the ring-shaped portion and coupled to the base flange. The bottom of the base flange may be provided with a second protrusion groove that engages with the second protrusion.

On the other hand, the wrap section wrap wrap facing the base portion; And a turning wrap engaged with the fixed wrap of the fixed scroll. In this case, the anti-rotation mechanism may be interposed between the fixed scroll and the wrap flange, the turning wrap may be disposed inside the anti-rotation mechanism.

Here, the anti-rotation mechanism is a ring-shaped portion; A first protrusion formed on an upper surface of the ring-shaped portion and coupled to the fixed scroll; And a second protrusion formed on a bottom surface of the ring-shaped portion and coupled to the wrap flange. In addition, a second protrusion groove may be formed on an upper surface of the wrap flange to engage with the second protrusion.

According to an aspect of the present invention having the configuration as described above, it is possible to share a part of the turning scroll by configuring the turning scroll to be separated into two parts, thereby making it easier to process the turning scroll and manufacture of the compressor. .

In addition, since the turning wrap and the bearing surface requiring precision machining are separated from each other, both of them can be processed independently, thereby reducing the time required for machining and minimizing damage to the machined part in the machining process.

1 is a cross-sectional view showing a first embodiment of a scroll compressor according to the present invention.
FIG. 2 is an enlarged partial cutaway view of the compression mechanism of FIG. 1.
3 is an exploded perspective view showing the turning scroll in FIG.
4 is an enlarged cross-sectional view of the turning scroll in FIG. 1.
5A to 5C are plan views schematically illustrating a process in which the first embodiment shown in FIG. 1 operates.
6 is a graph showing the magnitude of the axial force according to the position of the back pressure hole formed in the turning scroll in FIG.
7 is a sectional view showing a second embodiment of a scroll compressor according to the present invention.

Hereinafter, with reference to the accompanying drawings, it will be described in detail an embodiment of the scroll compressor according to the present invention.

1 is a longitudinal sectional view showing a first embodiment of a scroll compressor according to the present invention, Figure 2 is a partial cutaway view showing the assembly state of the compression mechanism in the scroll compressor according to Figure 1, Figure 3 is a scroll according to Figure 1 An exploded perspective view showing the turning scroll in the compressor.

As shown in Figures 1 to 3, the scroll compressor according to the present invention, the inner space of the case 1 is divided into a suction space 11 of the low pressure portion and the discharge space 12 of the high pressure portion, the case (1) A driving motor 2 for generating a rotational force is installed in the suction space 11 of the), and the main frame 3 is fixedly installed between the suction space 11 and the discharge space 12 of the case 1. A fixed scroll 4 is fixedly installed on an upper surface of the main frame 3, and is eccentrically coupled to the crank shaft 23 of the drive motor 2 between the main frame 3 and the fixed scroll 4. The swinging scroll 5 which forms two pairs of compression chambers P which move continuously with the fixed scroll 4 is installed so that rotation is possible. In addition, an old dam ring 6 is installed between the fixed scroll 4 and the revolving scroll 5 to prevent the revolving movement of the revolving scroll 5.

The suction tube 13 is coupled to the suction space 11 of the case 1 while the discharge tube 14 is coupled to the discharge space 12.

Here, although not shown in the drawings, the case is provided with a predetermined discharge space sealed and the suction space is a low pressure portion and the discharge space is a high pressure portion by a discharge plenum fixedly coupled to the fixed scroll (4), or The inner space of the case may be divided into a suction space and a discharge space by a high and low pressure separator (not shown) fixed to an upper surface of the fixed scroll and in close contact with an inner circumferential surface of the case.

The fixed scroll (4) is projected on the bottom surface of the hard plate portion 41 is formed with a fixed wrap 42 in the involute shape to form a compression chamber (P) together with the turning wrap (52) of the turning scroll (5). . A suction port (not shown) is formed on the outer circumferential surface of the hard plate portion 41 of the fixed scroll 4 so that the suction space 11 and the compression chamber P of the case 1 communicate with each other. A discharge port 44 is formed in the center of the hard plate part 41 so that the compression chamber P and the discharge space 12 of the case 1 communicate with each other. In the figure, 7 is a subframe, 8 is a discharge valve, 21 is a stator, and 22 is a rotor.

Therefore, in the above embodiment, the refrigerant flows from the outside into the suction space 11, which is the low pressure portion of the case 1, through the suction pipe 13, and the low pressure refrigerant in the suction space 11 is the suction port of the fixed scroll 4. It is introduced into the discharge space 12 of the case (1) through the discharge port 44 of the fixed scroll (4) is compressed while moving to the center of the rotating scroll and the fixed scroll by the turning scroll (5) The process of discharge is repeated.

On the other hand, the turning scroll 5 is configured to be separated into two parts, as shown in Figures 2 and 3, specifically, the wrap portion 50 and the wrap portion 50 meshing with the fixed scroll, respectively It is composed of a base portion 60 coupled to. The wrap portion 50 is configured to include a swing wrap 52 which is engaged with the fixed wrap 42 to form a compression chamber and a wrap flange 54 which is integrally formed with the swing wrap 52. The wrap flange 54 has a disc shape, and key shapes 56 are formed at both sides of the bottom surface to be coupled with the base 60.

The base portion 60 is coupled to the wrap portion 50 in a state facing the bottom surface of the wrap flange 54, specifically, the base flange 64 is formed to have a disk shape similar to the wrap flange 54 And a boss portion 68 formed on the bottom surface of the base flange 64 to be coupled to the crankshaft 23 described above.

In addition, keyholes 66 for fastening with the key-shaped portion 56 are formed at both edges of the upper surface of the base flange 64. The lap portion 50 is movable in the axial direction of the crankshaft relative to the base portion 60 by being inserted into the keyhole, but is coupled such that the key portion is not movable in the radial or circumferential direction of the base portion. do. However, since the axial movement of the wrap part 50 is limited by the distance between the fixed scroll and the main frame 3, the key shape 56 is inserted into the key hole 66. Will be maintained. That is, the two can be stably coupled by simply inserting the key shape into the key hole without using a method such as bolting or welding.

In addition, the Oldham ring 6 as the anti-rotation mechanism described above is coupled to the bottom of the base portion 60. Specifically, the old dam ring 6 includes a ring-shaped portion 6a that is in contact with the bottom surface of the base flange 64, and both sides of the ring-shaped portion 6a have a phase difference of 180 degrees. First projections 6b are formed. The first protrusion 6b is inserted into the first protrusion groove 3a formed in the main frame 3. In addition, two second protrusions 6c are formed on both sides of the upper surface of the ring-shaped portion 6b in the state of having a phase difference of 180 degrees. The second protrusion 6c is inserted into the second protrusion grooves 64a respectively formed on the bottom surface of the base flange 64.

Through this, even if the rotational force of the crankshaft 23 is transmitted to the base portion 60, the base portion 60 is rotated by the old dam ring 6 in a state where the rotation is prevented, the base portion Wrap portion 50 coupled to the radial movement is limited to 60 is also pivoted with the base portion (60).

On the other hand, the back pressure chamber 62 partitioned by the seal 62a is formed in the center of the upper surface of the base flange 64. Referring to FIG. 4, the back pressure chamber 62 is positioned between the bottom surface of the wrap flange 54 and the top surface of the base flange 64 and is inserted into and fixed to the base flange 64. The inner space of the back pressure chamber 62 is blocked from the low pressure space 11. The back pressure hole 54a communicates between the inner space of the back pressure chamber 62 and the compression chamber. It is formed through the flange 64.

Therefore, a portion of the compressed refrigerant present in the compression chamber is introduced into the back pressure chamber through the back pressure hole 54a in the process of sucking and compressing the refrigerant. Since the internal pressure of the back pressure chamber is higher than the pressure around the base flange 64, the base portion 60 rises along the axial direction from the wrap portion 50, through which the bottom of the fixed scroll and the pivot Sealing is made between the wraps 52.

Here, the pressure inside the back pressure chamber may be determined according to the position of the back pressure hole. That is, the pressure inside the back pressure chamber increases as the back pressure hole moves closer to the center of the swing wrap 52 of the swing scroll, and the pressure inside the back pressure chamber decreases as it moves outside.

5A to 5C are plan views schematically illustrating a process of compressing the refrigerant by the turning wrap and the fixed wrap, and the solid line corresponds to the center line of the fixed wrap 42 and the dotted line corresponds to the center line of the swing wrap 52, respectively. . 5C corresponds to the case where the pressure in the compression chamber reaches the discharge pressure and discharge starts. As described above, due to the operation principle of the scroll compressor, the pressure in the compression chamber formed by the swing wrap and the fixed wrap is continuously changed in the compression process. Thus, the pressure at any point of the turning wrap also changes continuously in one compression cycle.

For example, when the back pressure hole is at the point a, the point a is at a position maintained at the discharge pressure during the compression process, so that the same pressure as the discharge pressure is applied to the back pressure chamber. In this case, due to excessive back pressure, the thrust force between the bottom of the fixed scroll and the turning wrap is high, so the loss due to friction is increased. In addition, since the discharge pressure varies depending on the amount of compression load applied to the compressor, when the back pressure hole is formed at a point where the discharge pressure is continuously applied, such as point a, the thrust force varies depending on the load. Will affect performance. Specifically, the point a corresponds to a range within the discharge start time.

On the other hand, point b is a point at which the discharge pressure is applied for a predetermined time in the compression process, and the intermediate pressure between the suction pressure and the discharge pressure is applied at other times. Therefore, when the back pressure hole is applied to the point b, not only an appropriate back pressure can be secured, but also when the discharge pressure changes due to the load variation, etc., the buffer pressure is somewhat buffered due to the intermediate pressure. It can be offset to some extent. As a result of the present inventors, it was confirmed that the point b falls within a range of 180 degrees of the involute phase difference from the discharge start time of the turning wrap.

In the case of the point c, only the intermediate pressure is continuously applied during the compression process. When the back pressure hole is formed at the point c, the back pressure is too low to obtain a sufficient amount of sealing, which may cause refrigerant leakage. Is high.

FIG. 6 is a graph showing thrust forces generated under low load, overload, high differential pressure and high pressure ratio conditions when the back pressure holes are located at points a and b, respectively. Referring to FIG. 6, it can be seen that when the back pressure hole is located at a, not only the thrust force is excessively generated under the low load condition but also the deviation of the thrust force is large in each case. On the other hand, when the back pressure hole is located at b, relatively low thrust force is generated under low load conditions, and in each case, it can be seen that the variation in thrust force is relatively small.

On the other hand, unlike the first embodiment, an example in which the old dam ring is coupled to the fixed scroll (4) can also be considered. This case is shown in FIG. 7 is a cross-sectional view showing a second embodiment of the scroll compressor according to the present invention. Referring to FIG. 7, the old dam ring 6 is formed of the wrap portion 50 of the swing scroll, specifically, the wrap flange 54. It is installed on the upper surface. To this end, a first protrusion groove 4a for inserting the first protrusion 6b of the old dam ring 6 is formed at the bottom of the fixed scroll 4, through which the old dam ring 6 is formed. It is fixed so as not to rotate relative to the fixed scroll.

Here, the second protrusion (not shown) of the old dam ring 6 is inserted into the second protrusion groove (not shown) formed in the wrap flange 54.

In addition to the first and second embodiments, an example in which the wrap portion and the base portion are coupled by bolts or welding may be considered. In this case, the wrap portion is immovably fixed with respect to the base portion, and the old dam ring may be coupled to an upper surface of the wrap portion or a bottom surface of the base portion.

Claims (10)

case;
A fixed scroll installed in the case;
A wrap part engaged with the fixed scroll to form a compression chamber;
A base portion coupled to the wrap portion;
A driving motor coupled to a rear surface of the base part to eccentrically rotate the base part and the wrap part;
A main frame supporting the base part and installed in the case; And
And a rotation preventing mechanism coupled to any one of the base portion and the wrap portion to prevent rotation of the wrap portion and the base portion. The method of claim 1,
And the wrap unit and the base unit are key coupled. The method of claim 2,
Scroll key, characterized in that the key is integrally formed on any one side of the wrap portion and the base portion, the key hole is coupled to the other side. The method of claim 3,
A scroll compressor, characterized in that a plurality of keys are disposed radially on either side of the wrap portion and the base portion. The method of claim 1,
The base portion
A boss coupled to the rotating shaft of the drive motor; And
And a base flange facing the wrap portion. The method of claim 5,
The anti-rotation mechanism
Ring-shaped portion;
A first protrusion formed on a bottom surface of the ring shape and coupled to the main frame; And
And a second protrusion formed on an upper surface of the ring-shaped portion and coupled to the base flange. The method of claim 6,
And a second protrusion groove formed at a bottom of the base flange to engage with the second protrusion. The method of claim 1,
The wrap section
A wrap flange facing the base portion; And
And a rotating wrap engaged with the fixed wrap of the fixed scroll. The method of claim 8,
The anti-rotation mechanism
Ring-shaped portion;
A first protrusion formed on an upper surface of the ring-shaped portion and coupled to the fixed scroll; And
And a second protrusion formed on a bottom surface of the ring-shaped portion and coupled to the wrap flange. 10. The method of claim 9,
And a second protrusion groove formed on an upper surface of the wrap flange to engage with the second protrusion.

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