KR101062494B1 - Rotating shaft support structure of scroll compressor - Google Patents

Abstract

The present invention relates to a rotating shaft support structure of a scroll compressor. The present invention is installed in the center of the casing 20 and the power generating unit 80 for providing the power for the compression of the working fluid and the casing 20 is provided with a closed space is formed inside the base 25 at the bottom of the power generating unit A rotating shaft 90 rotated by an 80, a lower frame 40 installed at the center of the base 25 to support a lower end of the rotating shaft 90, the rotating shaft 90 and the lower frame 40. Interposed between the) is configured to include a compensation support 100 for compensating for the deviation of the axis of rotation (90). According to the present invention, even if an axial shift of the rotary shaft 90 occurs, the compensation support 100 compensates for the axial shift, thereby maintaining the operation reliability of the rotary shaft 90.

Scroll compressor, frame, base, rotating shaft

Description

Structure For Supporting A Revolving Shaft In A Scroll Compressor}

1 is a longitudinal sectional view of a typical scroll compressor.

FIG. 2 is an exploded perspective view illustrating a rotating shaft support structure of the scroll compressor of FIG. 1. FIG.

Figure 3 is a longitudinal sectional view showing the configuration of a scroll compressor provided with a preferred embodiment of a rotating shaft support structure according to the present invention.

Figure 4 is an exploded perspective view showing the configuration of an embodiment of the present invention.

5 is an operational state diagram showing the operation of the embodiment of the present invention;

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

20 Casing 25 Base

30: upper frame 40: lower frame

41: leg 41a: bend

43: support ring 43a: depression

50: compressor section 60: high and low pressure separator

70: check valve assembly 80: power generating unit

90: rotation axis 100: compensation support

101: seating portion 103: shaft support portion

The present invention relates to a compressor, and more particularly, to a rotating shaft support structure of a scroll compressor for compressing a working fluid while the two interlocking scrolls of the involute teeth rotate.

1 is a longitudinal cross-sectional view of a general scroll compressor, Figure 2 is an exploded perspective view showing a rotating shaft support structure of the scroll compressor of FIG.

As shown in these figures, the scroll compressor includes a casing (1) forming a closed space therein, a compression mechanism (6) mounted inside the casing (1) for compressing a working fluid, and a compression mechanism (6). ) Is provided with a power generator 13 for providing a driving force through the rotating shaft.

The casing 1 is composed of an upper cap 1a, an outer shell 1b, and a base 1c, and on one side, a suction pipe 2 for sucking the working fluid from the outside, and a discharge pipe for discharging the compressed working fluid. (3) is formed.

The upper frame 4 is fixed to the upper inside of the outer shell (1b) by welding so that the compression mechanism (6) is installed on the top. The lower frame 5 is fixed to the lower inner side of the outer cell 1b by welding and is installed adjacent to the base 1c. At this time, the welding of the upper frame 4 and the outer shell 1b is made at four points, and the welding of the lower frame 5 and the outer cell 1b is generally made at three points. A power generation unit 13 is installed between the upper frame 4 and the lower frame 5.

The compression mechanism (6) is composed of a fixed scroll (7), a swinging scroll (8) and an old dam ring (9). That is, the fixed scroll (7) has a fixed scroll (7a) of the involute shape, the discharge port (7b) is formed so that the compressed working fluid can be discharged in the center portion is fixed to the inside of the casing (1). And the turning scroll (8) is provided with a turning scroll (8a) formed in the same involute shape corresponding to the fixed scroll (7a). At this time, the fixed scroll (7a) and the swinging scroll (8a) is engaged with each other by 180 ° phase difference, the crescent shaped space forms four compression spaces at the same time.

In addition, the high and low pressure separating plate 11 which divides the inner space of the casing 1 into the high pressure part S1 and the low pressure part S2 is mounted on the fixed scroll 7. In addition, a check valve assembly 12 is mounted on the discharge port 7b to block the compressed working fluid of the high pressure part S1 from flowing back to the inside of the compression space P.

And the old dam ring (9) is mounted between the upper frame (4) and the swinging scroll (8) to convert the rotational movement of the rotary shaft (15) to a turning movement.

The power generator 13 includes a stator 14 fixed inside the casing 1 and a rotor 15 that rotates due to electromagnetic interaction with the stator 14.

The rotating shaft 16 serves to transmit the rotational force of the rotor 15 to the turning scroll (8). The upper end of the rotary shaft 16 is inserted into the upper frame 4 and the lower end is inserted into the lower frame 5 to be supported. And the support plate 17 is interposed between the rotating shaft 16 and the lower frame (5).                         

The support plate 17 has a substantially disc shape, a through hole 17a, which is a passage through which a central portion penetrates and oil flows into the rotation shaft, and protruded protrusions 17b are formed at both ends of the lower frame 5. It is fitted into the corresponding groove (not shown) of the) to maintain a fixed state.

However, the prior art as described above has the following problems.

That is, in the conventional scroll compressor, the upper frame 4 is welded to the outer shell 1b of the casing 1 at four points, and the lower frame 5 is welded to the outer cell 1b at three points. Occurs when shape deformation occurs. Accordingly, the rotation shaft 16 inserted and rotated in the upper frame 4 and the lower frame 5 may cause a displacement phenomenon due to the deformation of the frames 4 and 5.

However, in the conventional compressor, when such a displacement of the rotary shaft 16 occurs, the support plate 17 interposed between the rotary shaft 16 and the lower frame 5 is in full surface contact with the rotary shaft 16. It is unable to support the rotating shaft 16. Therefore, the rotating shaft 16 is rotated while applying a load to the support plate 17, there was a problem that the operation reliability of the rotating shaft 16 is lowered.

Accordingly, the present invention has been made to solve the above conventional problems, an object of the present invention is to provide a rotating shaft support structure of the scroll compressor to compensate for the displacement of the rotating shaft.

Another object of the present invention is to provide a rotating shaft support structure of a scroll compressor having a compact and lightweight lower frame.

According to a feature of the present invention for achieving the object as described above, the present invention is a casing having a sealed space formed therein and a base is provided at the bottom, the upper frame is installed in the casing, and the upper frame A rotating shaft rotatably installed in the center of the power generating unit which provides an upper end to provide power for compressing the working fluid, a lower frame installed at the center of the base to support the lower end of the rotating shaft, and the rotating shaft and the lower frame Interposed between the compensation shaft is configured to include a compensation support to compensate for the displacement of the axis of rotation.

The lower frame includes a plurality of legs seated on the base, and a support ring that connects an upper end of the legs and has a pair of depressions formed symmetrically about a center thereof.

The compensating support includes a seating portion respectively seated in the recessed portion, and a shaft support portion provided in a ring shape in the seating portion and inclined in a predetermined direction about the seating portion by a force applied from the rotating shaft.

According to the present invention having the configuration as described above, even if an axis shift of the rotary shaft occurs, the compensation support compensates for the axis shift, thereby improving the operation reliability of the rotary shaft.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the rotating shaft support structure of the scroll compressor according to the present invention will be described in detail.                     

Figure 3 is a longitudinal sectional view showing the configuration of a scroll compressor employing a preferred embodiment of the rotating shaft support structure according to the present invention, Figure 4 is an exploded perspective view showing the configuration of the embodiment of the present invention.

As shown in these figures, the casing 20 is composed of the upper cap 21, the outer shell 23 and the base 25 to form a closed space therein. One side of the casing 20 is provided with a suction pipe 27 for sucking the working fluid from the outside and a discharge pipe 29 for discharging the compressed working fluid. At this time, the working fluid sucked into the suction pipe 27 is led to the low pressure part S2 having a relatively low pressure, and moves to the high pressure part S1 via the compression mechanism part 50 which will be described below, and then the discharge pipe 29. Is spilled through.

The base 25 is installed at the lower end of the outer shell 23 of the casing 20 to support the casing 20. The upper surface of the base 25 serves as an oil storage unit for storing oil for cooling and lubrication of the compressor.

The upper frame 30 is fixed to the inner upper portion of the casing 20. The upper frame 30 is generally welded at four points to the outer shell 23 of the casing 20.

The lower frame 40 is installed at the center of the base 25. The lower frame 40 is composed of a plurality of legs 41 and the support ring 43, the compensation ring 100 to be described below is mounted on the support ring 43. In other words, a plurality of the legs 41 are conformally arranged along the circumferential direction. The lower end of each leg 41 is provided with a bent portion 41a which is bent and fixed to the base 25 by welding or the like. In this embodiment, four legs 41 are provided with a total of 90 degrees.                     

The support ring 43 has a pair of depressions 43a connecting the upper end of the leg 41 and symmetrically with respect to the center thereof. In this embodiment, the formation point of the depression 43a is configured to correspond to the upper end of the leg 41 facing each other.

A compression mechanism 50 is installed on the upper end of the upper frame 30, and a power generation unit 80 around the rotating shaft 90 is installed between the upper frame 30 and the lower frame 40.

Compressor portion 50 is composed of a fixed scroll 51, a rotating scroll 53 and the old dam ring (55). In this case, the fixed scroll 51 has an involut-shaped fixed scroll wrap 51a and a discharge port 51b is formed to discharge the working fluid compressed in the center portion and is fixedly mounted in the casing 20. In other words, the fixed scroll 51 is fixed to the upper part of the upper frame 30 is installed on the upper end of the power generating unit 80 for generating power.

The turning scroll 53 is engaged with the fixed scroll 51 at the bottom of the fixed scroll 51. The orbiting scroll 53 forms the same involute orbiting scroll scraps 53a formed corresponding to the fixed scroll scraps 51a, and the fixed scroll scraps 51a and the orbiting scroll scraps 53a are 180 ° from each other. By interlocking with the phase difference, the crescent shaped space is mounted to form four compression spaces P at the same time.

In addition, the high and low pressure separating plate 60 partitioning the inner space of the casing 20 into the high pressure part S1 and the low pressure part S2 is mounted on the upper side of the fixed scroll 51. And a check valve assembly 70 is provided above the discharge port 57. The check valve assembly 70 serves to block the compressed working fluid of the high pressure portion (S1) flows back to the interior of the compression space (P).

The old dam ring 55 serves to convert the rotational motion of the rotary shaft 90 into the pivoting motion, and is provided between the upper frame 30 and the pivoting scroll 53.

The power generator 80 is installed inside the casing 20 and provides power for compressing the working fluid. The power generator 80 includes a stator 81 and a rotor 83. Here, the stator 81 is installed between the upper frame 30 and the lower frame 40 which will be described below, and is fixed inside the casing 20. The rotor 83 is rotatably installed inside the stator 81. That is, the rotor 83 is rotated due to the electromagnetic interaction with the stator 81.

The rotating shaft 90 is installed at the center of the power generating unit 80 to rotate by the power generating unit 80. That is, by transmitting the rotational force of the rotor 83 to the turning scroll 53, it is press-fit fixed to the rotor 83 so as to rotate simultaneously with the rotor (83). The upper end of the rotating shaft 90 is inserted into the upper frame 30 and the lower end is supported by the lower frame 40.

The compensation support 100 is interposed between the rotary shaft 90 and the lower frame 40. The compensation support 100 compensates for the axial shift when the axial shift caused by the rotary shaft 90 by welding the upper frame 30 to the outer shell 23 occurs. ) Rotates smoothly. The compensation support 100 is composed of a seating portion 101 and the shaft support (103).

The seating portions 101 are seated on the recessed portions 43a, respectively, and are manufactured by bending a sheet material into a 'b' shape. Since the seating portion 101 is not fixed to the recessed portions 43a, the seating portion 101 is rotatable by a predetermined angle about a line connecting the seating portions 101 seated on the recessed portions 43a by an external force.

In addition, the shaft support portion 103 is to be coupled to the seating portion 101, it is composed of a ring-like similar to the support ring 43. Since the lower end of the shaft 90 is seated on the upper surface of the shaft support 103 is subjected to the pressure applied from the shaft 90. And the bottom surface of the shaft support 103 is formed to form a curved surface toward the inside. Therefore, when axial displacement occurs in the rotary shaft 90, the shaft support 103 is inclined in a predetermined direction together with the seating portion 101 to compensate for the axial displacement of the rotary shaft 90.

The operation of the scroll compressor configured as described above will be described with reference to FIG. 5.

When power is supplied to the power generator 80, the rotor 83 rotates by the interaction between the stator 81 of the power generator 80 and the rotor 83 installed inside the stator 81. do. The rotation force generated at this time is transmitted to the rotating shaft 90, the rotating shaft 90 is a rotational movement of the rotating shaft 90 is rotated by the old dam ring 55 mounted on the upper portion of the rotating shaft 90 Is converted to drive the turning scroll 53.

Accordingly, the pivoting scroll 53 has a relative pivoting motion with respect to the fixed scroll 51 about the rotational shaft 90 so that a crescent shaped compression space P is continuously generated. In addition, the compression space (P) is larger toward the outside and smaller as it is closer to the center, and the working fluid sucked through the suction pipe (27) is compressed as it moves to the center of the fixed scroll (51). Therefore, a suction chamber (not shown) is formed at the outer circumferential portion of the fixed scroll 51 and a discharge port 51b is formed at the center to suck, compress, and discharge the working fluid.

As the compression proceeds, the check valve assembly 70 flows upward by the pressure difference to open the discharge port 51b. Therefore, the compressed working fluid flows to the high pressure part S1 through the discharge port 51b, and the compressed working fluid of the high pressure part S1 is separated from the low pressure part S2 by the high and low pressure separating plate 60, thereby discharging the discharge pipe ( 29 is discharged to the outside of the casing 20. When the scroll compressor stops operating, the check valve assembly 70 flows downward to block the discharge port 51b, thereby preventing the working fluid from flowing backward.

At this time, the rotation shaft 90 may be a phenomenon that the coaxial arrangement is shifted due to the deformation by the welding coupling of the upper frame 30. In this case, the rotating shaft 90 is inclined to rotate. However, the compensation support 100 seated on the upper end of the lower frame 40 may be inclined in one direction about the seating portion 101 of the compensation support 100, as indicated by the arrow in FIG. The compensation support 100 is seated on the support ring 43 of the lower frame 40, and the seating part 101 of the compensation support 100 is recessed to the depression 43a of the support ring 43. This is because the shaft support portion 103 of the compensation support 100 can be rotated at a predetermined angle within a range limited to the support ring 43 with respect to the seating portion 101.

Therefore, since the compensation support 100 having the above configuration is installed to support the lower end of the rotary shaft 90, the compensation support 100 is the rotary shaft 90 in accordance with the inclination of the rotary shaft 90 And inclined in a predetermined direction.

In addition, the shaft support portion 103 of the compensation support 100 is formed in a ring shape and the bottom surface of the rotary shaft 90 is seated on the upper end thereof, so that the rotary shaft 90 is continuously in surface contact with the shaft support 103. Rotate Therefore, even if axial deviation occurs in the rotary shaft 90, the rotary shaft 90 is stably supported by the compensation support (100).

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

In the rotating shaft support structure of the scroll compressor according to the present invention as described above in detail can be expected the following effects.

That is, the present invention is configured to seat the compensation support on the lower frame having a support ring to support the lower end of the rotating shaft inclined in a predetermined direction. Therefore, in the present invention, even if an axis shift of the rotary shaft occurs, the compensation support compensates for the axis shift, thereby maintaining the operation reliability of the rotary shaft.

And in the present invention, the lower frame is composed of a plurality of legs and a support ring for connecting the upper ends of the legs. Therefore, the present invention has the effect that the structure of the lower frame is simplified compared to the conventional lower frame, the manufacturing cost is relatively reduced.

Claims (3)

A casing having a sealed space formed therein and a base provided at the bottom thereof; An upper frame installed inside the casing, A rotating shaft rotatably installed at the center of the power generating unit, the upper end of which is supported by the upper frame to provide power for compressing the working fluid; A lower frame installed at the center of the base to support the lower end of the rotating shaft; And a compensating support interposed between the rotating shaft and the lower frame to compensate for the axial deviation of the rotating shaft. According to claim 1, wherein the lower frame is a plurality of legs seated on the base, And a support ring which connects the upper end of the leg and is formed with a pair of depressions symmetrically about the center. The method of claim 2, wherein the compensation support, and the seating portion respectively seated in the depression, And a shaft support portion provided in the seat portion in a ring shape and inclined in a predetermined direction about the seat portion by a force applied from the rotation shaft.

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