KR20060039828A - A scroll compressor - Google Patents

Abstract

The present invention relates to a scroll compressor. The present invention provides a casing 20 including a base 25 having an outer cell 21 and a separate oil storage part 25a therein; A power generator 80 installed inside the casing 20 and providing power for compressing the working fluid; A rotating shaft 90 installed at the center of the power generator 80 and rotated by the power generator 80; A compression mechanism (50) installed in the casing (20) and compressing the working fluid by rotating the rotating scroll (53) connected to the rotating shaft (90) with respect to the fixed scroll (51); An upper frame 30 installed at an upper end of the rotating shaft 90 to rotatably support the rotating shaft 90 and having the fixed scroll 51 installed thereon; And a lower frame 40 which is supported at the center of the base 25 and protrudes toward the oil storage portion 25a to rotatably support one end of the rotation shaft 90. According to the present invention, the lower frame 40 supporting the lower end of the rotating shaft 90 is seated on the upper end of the base 25 and the lower frame (by continuously welding the contact portion of the base 25 and the casing 20) Minimizing the shape deformation of the 40) has the effect of preventing the shaft displacement of the rotary shaft 90.

Scroll, frame, base, oil

Description

Scroll Compressor

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

Figure 2 is a longitudinal sectional view showing the configuration of a preferred embodiment of a scroll compressor according to the present invention.

Figure 3 is an enlarged longitudinal sectional view of an embodiment of the present invention.

4 is a plan view showing a configuration of an embodiment of the present invention.

5 is a longitudinal sectional view showing another embodiment of the scroll compressor according to the present invention.

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

20 Casing 25 Base

25a: through hole 25b: extension part

25c: support part 30: upper frame

40: lower frame 41: plate portion

41a: engagement hole 43: cylindrical portion

45: bottom plate 45a: through hole

50: compressor section 51: fixed scroll

53: turning scroll 60: high and low pressure separator

70 check valve assembly 80 power generation unit                 

81: stator 83: rotor

90: rotation axis 91: oil feeder

93: oil euro

TECHNICAL FIELD The present invention relates to a compressor, and more particularly, to a scroll compressor for compressing a working fluid while turning two interlocking scrolls of involute teeth.

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

As shown in the figure, the scroll compressor has a casing (1) forming an enclosed space therein, a compression mechanism (6) mounted in the casing (1) to compress the working fluid, and the compression mechanism (6). The power generating unit 13 is provided to provide a driving force through the rotating shaft is configured.

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 wrap (7a) of the involute shape is formed in the discharge port 10 so that the compressed working fluid can be discharged in the center portion is fixedly mounted in the casing (1). And the turning scroll (8) is provided with a turning scroll (8a) formed in the same involute shape formed 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 P1 and the low pressure part P2 is mounted on the fixed scroll 7. In addition, a check valve assembly 12 is mounted on the discharge port 10 to prevent the compressed working fluid of the high pressure part P1 from flowing backward and blocking the inflow into the compression space P.

And the old dam ring (9) is mounted between the rotating shaft (15) and the turning scroll (8) to convert the rotating movement of the rotating shaft (15) into a turning movement.

The power generator 13 is composed of a stator 14 fixed inside the casing 1 and a rotor 15 for converting an electric force into a rotational force inside 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.

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. As a result, shape deformation occurs. Therefore, the rotation shaft 16 inserted and rotated in the upper frame 4 and the lower frame 5 may cause an axial shift due to the deformation of the frames 4 and 5. In this way, if the shaft alignment of the rotary shaft 16 is not correct, the rotation torque of the rotary shaft 16 is not good, and thus there is a problem in that power consumption increases.

The oil introduced into the casing 1 is accumulated on the base 1c. At this time, the oil should have a lower oil surface than the rotor 15, and considering the rotation of the rotor 15, it is preferable that a proper distance is maintained to the oil surface. This is because when the oil level of the oil is not maintained at the proper distance from the rotor 15, an oil forming phenomenon occurs, and the generated foam blocks the rotation of the rotor 14 to increase the input loss.

However, in the conventional structure, the amount of oil that can maintain the proper distance was inevitably dependent on the axial length of the casing 1. By the way, the structure of the casing (1) can not be changed once designed, even if it is necessary to increase the amount of oil flowing into the casing (1) there was a problem that the change range is extremely limited.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, an object of the present invention is to provide a scroll compressor in which the support state of the rotating shaft is set accurately.

And another object of the present invention is to provide a scroll compressor capable of varying the volume of the portion where the oil is stored.

According to a feature of the present invention for achieving the object as described above, the present invention comprises an outer shell and a base installed on the bottom of the outer cell to support the outer cell and having a separate oil storage unit therein A casing having a sealed space therein; A power generator installed inside the casing and providing power for compressing the working fluid; A rotating shaft installed at the center of the power generating unit and rotating by the power generating unit; A compressor mechanism unit installed inside the casing and compressing the working fluid by rotating the rotating scroll connected to the rotating shaft about the fixed scroll; An upper frame installed at an upper end of the rotating shaft to rotatably support the rotating shaft and having the fixed scroll installed thereon; And a lower frame that is supported at the center of the base and protrudes toward the oil storage part to rotatably support one end of the rotating shaft.

The base includes an upper plate portion supporting the lower frame and having a through hole formed in a central portion thereof, an extension portion bent from an edge of the upper plate portion, and a support portion connected to the extension portion to be radially extended. The volume is defined by the top plate, the extension and the support.                     

The lower frame has a plate-like portion extending from the through-hole along the upper plate portion of the base, and a bottom plate is formed to support the lower end of the rotating shaft, and is fixed in the direction of the oil storage portion from the through-hole with an inner diameter corresponding to the rotating shaft. Consists of a cylindrical portion extending by the length, the bottom plate of the cylindrical portion is formed with a through-hole through which oil can be introduced and discharged into the oil reservoir.

The axial length of the extension is formed by varying its length in accordance with the required volume of the oil reservoir.

The extension part is inscribed in the outer cell, and the support part is continuously welded along a portion contacting the lower end of the outer cell.

The lower frame is bolted to the base.

According to the present invention having the configuration as described above, by mounting the lower frame supporting the lower end of the rotary shaft to the upper end of the base and the base circumferentially welded to the casing to minimize the deformation of the lower frame by welding to minimize the rotation of the rotary shaft Axial shift is prevented.

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

2 is a longitudinal sectional view showing a configuration of a preferred embodiment of a scroll compressor according to the present invention, Figure 3 is a longitudinal sectional view showing an enlarged embodiment of the present invention, Figure 4 is a plan view showing a configuration of an 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 moves to the high pressure part P1 through the low pressure part P2 which is relatively low pressure, and then flows out through the discharge pipe 29.

The base 25 is installed at the lower end of the outer shell 23 of the casing 20 to support the casing 20. This base 25 is comprised from the upper board part 25b, the extension part 25c, and the support part 25d.

The upper plate portion 25a has a lower frame 40 to be described below on the upper surface thereof, and a through hole 25e into which the lower frame 40 is inserted is formed in the center portion.

The extension portion 25c is bent from the top plate of the base 25, and the support portion 25d is connected to the extension portion 25c and bent radially. At this time, the side of the extension portion 25c is in contact with the inner periphery of the outer shell 23 of the casing 20. In addition, the lower end of the outer shell 23 is seated on the upper end of the support portion 25d. The outer cell 23 and the support 25d are fixed by welding, and are continuously welded along the contact portion of the outer cell 23 and the support 25d to minimize the shape deformation due to the welding.

The inside of the base 25 is formed with a certain volume of space is formed an oil storage portion (25a) for temporarily storing the oil enclosed in the casing (20). That is, the oil storage unit 25a stores oil in a space defined by the upper plate portion 25b, the extension portion 25c, and the support portion 25d.

The upper frame 30 is welded to the inner upper portion of the outer shell 23 of the casing 20, and the lower frame 40 is installed below. The lower frame 40 is seated on the upper plate portion 25b of the base 25 and is coupled to the upper plate portion 25b.

The lower frame 40 is composed of a plate portion 41 and the cylindrical portion 43. The plate portion 41 extends from the through hole 25e of the base 25 along the upper plate portion 25b of the base 25. In this embodiment, the plate-shaped portion 41 is exemplarily formed in a disc shape. On the plate portion 41, a plurality of coupling holes 41a are formed along the circumferential direction. The coupling hole 41a is for coupling the lower frame 40 to the base 25, and the lower frame 40 and the base 25 may be bolted or screwed through the coupling hole 41a. .

In this case, the coupling holes 41a may be provided at the plate-shaped portion 41 at intervals of 120 °, and four may be provided at intervals of 90 °, and the number or intervals thereof are not limited. By the way, in the present embodiment, four coupling holes 41a are provided on the plate portion 41. In addition, when the coupling hole 41a is formed in the lower frame 40, a fastening hole 25f corresponding to the shape, size, and number of the coupling holes 41a is formed in the upper plate of the base 25. .

The cylindrical portion 43 is formed with a bottom plate 45 to support the lower end of the rotating shaft 90 to be described below. The cylindrical portion 43 extends by a predetermined length along the axial direction with an inner diameter corresponding to the rotating shaft 90 and an outer diameter corresponding to the through hole 25e. At this time, the length of the cylindrical portion 43 is extended depending on the length of the rotating shaft 90 supported by the upper frame 30.                     

And the through-hole 45a is formed in the bottom plate 45 of the cylindrical portion 43. The through hole 45a serves as a passage for the oil introduced into the casing 20 to enter the oil storage 25a of the base 25. In addition, the through hole 45a is a passage through which the oil stored in the base 25 flows out to the oil feeder 91 to be described below.

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 57 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 P1 and the low pressure part P2 is mounted on the fixed scroll 51. And a check valve assembly 70 is provided above the discharge port (57). This check valve assembly 70 serves to block the compressed working fluid of the high pressure portion (P1) flows back into the compression space (P).

The old dam ring 55 serves to convert the rotational movement of the rotational shaft 90 into the rotational movement, and is provided between the rotational shaft 90 and the rotational 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 serves to convert the electric force into the rotational force inside 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, the rotational force of the rotor 83 is transmitted to the turning scroll 53 to be press-fitted 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 inserted into and supported by the lower frame 40.

In addition, the lower end of the rotating shaft 90 is provided with an oil feeder (91). The oil feeder 91 is stored in the oil storage unit 25a and sucks oil through the through hole 45a of the lower frame 40 so as to penetrate the central portion of the rotating shaft 90 vertically to form an oil passage 93. Oil is supplied to the friction portion of the compression mechanism (50) through.

Figure 5 is a longitudinal sectional view showing another embodiment of the support structure of the scroll compressor according to the present invention.

As shown in the figure, in this embodiment, the extension 25c 'of the base 25' extends more along the axial direction than in the first embodiment. As the extension part 25c 'is further extended, the volume of the inside of the base 25', that is, the oil reservoir 25a 'is increased. Therefore, the amount of oil that can flow into and be stored in the base 25 'through the top plate 25b' of the base 25 'is increased.

At this time, the cylindrical portion 43 'of the lower frame 40' mounted on the base 25 'also extends in the axial direction. Since the position of the lower end of the rotary shaft 90 is the same even though the volume of the oil reservoir 25a 'is increased, the bottom plate 45' of the cylindrical portion 43 'is disposed at the lower end of the cylindrical shaft 43'. To support it. In addition, the cylindrical portion 43 'is extended so that the bottom plate 45' is located at a relatively lower end of the base 25 ', so that the oil stored in the base 25' is easily passed through the cylindrical portion 43 '. It may flow out to 45a 'and be sucked up along the rotating shaft 90.

This embodiment can be advantageously used when the air conditioner, etc., in which the scroll compressor is installed, is located relatively far from the outdoor unit, and thus the pipe length becomes long.

And this embodiment is a part of the configuration as described above is different from the first embodiment, but the same in terms of operation, the operation according to the present invention described below will be described without distinguishing the embodiment.

The operation of the scroll compressor configured as described above is as follows.

When power is supplied to the power generator 80, the rotor 83 is formed by the interaction between the stator 81 of the power generator 80 and the rotor 83 installed inside the stator 81. Rotate 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 57 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 57. Therefore, the compressed working fluid flows to the high pressure part P1 through the discharge port 57, and the compressed working fluid of the high pressure part P1 is separated from the low pressure part P2 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 57, thereby preventing the working fluid from flowing backward.

And the oil stored in the oil storage portion 25a of the base 25 during the compression as described above flows out through the through hole 45a formed in the lower frame 40 to rotate with the rotation of the rotary shaft 90 It is absorbed by 91. The oil sucked in this way is supplied to the compression mechanism (50) through the oil passage (93).                     

In this way, the oil supplied to the compression mechanism (50) is supplied to the friction portion between the upper frame 30 and the swing scroll (53) is lubricated.

At this time, the volume of the oil reservoir 25a may be changed and mounted according to the amount of oil required. In other words, the axial length of the extension portion 25c of the base 25 may be changed according to the amount of oil required to change the volume of the oil storage portion 25a. This can be properly designed depending on the length of the pipe or the degree of oil required. Therefore, since the base 25 formed therein is installed at the bottom of the scroll compressor to accommodate the required amount of oil, the oil introduced first is mostly accommodated in the oil reservoir 25a. Therefore, the minimum distance between the oil level and the rotor 83, that is, the distance between the upper plate portion 25b of the base 25 and the rotor 83 is properly maintained.

The lower frame 40 is screwed or bolted to the upper plate portion 25b of the base 25. The base 25 on which the lower frame 40 is mounted is welded to the outer cell 23 through the support 25d. Therefore, since there is no direct coupling relationship between the lower frame 40 and the outer shell 23, the lower frame 40 is not deformed by welding. In addition, since the welding of the support 25d and the outer cell 23 of the base 25 is continuously performed along the contact area between the support 25d and the outer cell 23, deformation of the base 25 by welding is performed. Even if this occurs, the deformation is equally reflected in the lower frame 40. Therefore, a phenomenon in which the lower frame 40 is shifted to one side by the deformation and the coaxial arrangement of the upper frame 30 is shifted can be prevented.

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 scroll compressor according to the present invention as described in detail above, the following effects can be expected.

That is, in the present invention, the lower frame supporting the lower end of the rotating shaft is seated on the upper end of the base, and the base is continuously welded to the contact portion with the casing. Therefore, the present invention has the effect of improving the input by minimizing the deformation of the lower frame by welding to prevent the axis shift of the rotation axis.

In addition, the present invention has an advantage that the power generating unit of the scroll compressor can be stably operated by installing a base having an increased volume of the oil storage unit in the case according to the required oil amount to prevent contact between the rotor and the oil.

In addition, the structure of the base and the lower frame can maintain an appropriate distance between the rotor and the oil surface, thereby reducing the input loss by preventing the occurrence of oil forming phenomenon.

Claims (6)

A casing having an outer cell and a base installed at a lower end of the outer cell to support the outer cell and including a base having a separate oil storage unit therein and having a sealed space therein; A power generator installed inside the casing and providing power for compressing the working fluid; A rotating shaft installed at the center of the power generating unit and rotating by the power generating unit; A compressor mechanism unit installed inside the casing and compressing the working fluid by rotating the rotating scroll connected to the rotating shaft about the fixed scroll; An upper frame installed at an upper end of the rotating shaft to rotatably support the rotating shaft and having the fixed scroll installed thereon; And a lower frame which is supported at the center of the base and protrudes toward the oil storage part to rotatably support one end of the rotating shaft. According to claim 1, The base supports the lower frame and the upper plate portion formed with a through hole in the central portion, An extension part bent from an edge of the upper plate part; A support part connected to the extension part and bent in a radial extension; The oil storage unit is a scroll compressor, characterized in that the volume is limited by the top plate, extension and support. According to claim 2, The lower frame, Plate-like portion extending from the through hole along the upper plate of the base, The bottom plate is formed to support the lower end of the rotating shaft and consists of a cylindrical portion extending by a predetermined length from the through hole toward the oil storage portion with an inner diameter corresponding to the rotating shaft, Scroll through the bottom plate of the cylindrical portion is characterized in that the through hole through which the oil is introduced into and out of the oil reservoir is formed. 4. A scroll compressor according to claim 2 or 3, wherein the axial length of the extension portion is formed by varying the length in accordance with the required volume of the oil storage portion. The scroll compressor according to claim 4, wherein the extension part is inscribed in the outer cell, and the support part is continuously welded along a portion contacting the lower end of the outer cell. 6. The scroll compressor of claim 5, wherein the lower frame is bolted to the base.

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