KR20060030309A - A scroll compressor - Google Patents

Abstract

The present invention relates to a scroll compressor. The present invention and the casing 20 is a certain amount of oil is stored at the bottom; A power generator 30 installed inside the casing 20 and providing power for compressing the working fluid; The casing 20 is installed at the center of the power generator 30 and through an oil supply hole 45 formed therein by the rotational force of the oil feeder 43 and the centrifugal force generated when the power generator 30 rotates. A rotary shaft 40 for sucking up the oil stored at the bottom of the; A compression mechanism unit 50 installed at an upper end of the rotating shaft 40 to compress the working fluid according to the rotation of the rotating shaft 40; An upper frame 80 supporting the compression mechanism unit 50 and an oil passage 83 formed therein for allowing oil drawn up through the rotary shaft 40 to move to an edge thereof; At least a part of the lower frame 90 is immersed in the oil stored in the casing 20 and the lower end of the rotary shaft 40 is inserted and supported, the side wall of the oil supply hole 45 is a portion of the oil sucked At least one oil scattering flow passage 47 is formed to be scattered to the power generating unit 30. According to the present invention, the oil is supplied to the lower end of the power generating unit 30 has an effect that the overheated power generating unit 30 is cooled.

Scroll compressor, frame, 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.

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

20: casing 27: oil reservoir

30: power generating unit 40: rotation axis

43: oil feeder 45: oil supply hole

45a: Lower supply hole 45b: Upper supply hole

47: oil fly flow path 50: compressor section

60: high and low pressure separator 70: check valve assembly

80: upper frame 81: truss bearing surface

83: drainage path 90: lower frame

The present invention relates to a compressor, and more particularly to a scroll compressor that compresses a working fluid while two interlocking scrolls of involute teeth rotate.

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). Is configured to be provided with a power generating unit 4 for providing a driving force through the rotary shaft (5).

The casing (1) is composed of an upper cap (1a), an outer shell (1b) and a lower cap (1c), the suction pipe (2) for sucking the working fluid from the outside on one side, and the discharge to discharge the compressed working fluid The tube 3 is formed. And the oil storage unit (1d) for storing the oil is formed on the lower cap (1c) of the casing (1).

The power generating unit 4 is composed of a stator 4a fixed inside the casing 1 and a rotor 4b for converting an electric force into a rotational force inside the stator 4a.

The rotating shaft 5 serves to transmit the rotational force of the rotor 4b to the compression mechanism 6. An oil feeder 5a is provided at the lower end of the rotary shaft 5, and an oil supply hole 5b is formed therein to suck oil from the oil storage unit 1d and transfer it to the contact area with the compression mechanism 6.

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 crescent-shaped space generated by the fixed scroll 7a and the swing scroll 8a are 180 degrees out of phase with each other to form four compression spaces at the same time.

And the old dam ring (9) is mounted between the upper frame (12) and the turning scroll (8) to convert the rotational movement of the rotary shaft (5) to a turning movement.

In addition, the high and low pressure separating plate 10 partitioning the inner space of the casing 1 into the high pressure part S1 and the low pressure part S2 is mounted above the fixed scroll 7. In addition, a check valve assembly 11 is mounted above 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.

The upper frame 12 is fixed to the upper inner side of the outer shell (1b) is provided with a compression mechanism (6) at the top. And the lower frame 13 is installed in the lower inner side of the outer shell (1b). At this time, the upper frame 12 supports the upper end of the rotary shaft 5 and the lower frame 13 supports the lower end of the rotary shaft 5. In addition, an oil passage 12a is formed in the upper frame 12 toward the edge so that the oil supplied to the compression mechanism 6 through the rotary shaft 5 can be recovered to the oil storage 1d.

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

That is, in the conventional scroll compressor, as indicated by the black arrows in FIG. 1, oil for lubrication and cooling of each part is supplied from the oil storage part 1d to the compression mechanism part 6 via the rotation shaft 5. Thereafter, the oil is circulated in a cycle in which the oil moves to the edge along the drainage passage 12a of the upper frame 12 and then is recovered to the oil storage unit 1d along the inner circumferential surface of the outer shell 1b. At this time, in order to supply oil to the power generator 4 to cool the power generator 4, the conventional scroll compressor is recovered from the upper frame 12 to the oil storage unit 1d in the process of generating the power. A method in which part of the oil is supplied to (4) was used.

Therefore, the conventional scroll compressor does not have a configuration for directly supplying oil to the power generator 4, so that oil is not properly supplied to the power generator 4, thereby cooling the power generator 4 through oil. There was a problem that the efficiency is lowered.

In the conventional compressor, since the cooling efficiency of the power generator 4 due to oil is thus reduced, the working fluid introduced into the suction pipe 2 is compressed by the compression mechanism 6, and is illustrated by a white arrow in FIG. 1. As described above, the power generation unit 4 was cooled while being circulated. Therefore, the conventional compressor has a problem in that the compression fluid is reduced by reducing the specific volume by entering the compression mechanism 6 in a state where the working fluid is relatively high in temperature.

Accordingly, the present invention has been made to solve the above conventional problems, an object of the present invention is to provide a scroll compressor for supplying oil for cooling to the power generating unit.

Another object of the present invention is to provide a scroll compressor whose power generator maintains an appropriate temperature range.

According to a feature of the present invention for achieving the object as described above, the present invention comprises a casing in which a sealed space is formed therein and a certain amount of oil is stored at the bottom; 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 sucking the oil stored at the lower end of the casing through an oil supply hole formed therein by the rotational force of the oil feeder and the centrifugal force generated when the power generating unit rotates; A compressor mechanism unit installed at an upper end of the rotating shaft to lubricate oil supplied from the oil supply hole to a contact surface with the rotating shaft and compress the working fluid according to the rotation of the rotating shaft; An upper frame supporting the compressor mechanism and having a drainage path through which oil sucked through the rotary shaft can be moved to an edge; At least a part is submerged in the oil stored in the casing and the lower frame of the rotary shaft is inserted into and supported, the side wall of the oil supply hole is an oil fly flow passage formed so that a portion of the oil sucked into the power generating unit is scattered One or more are formed.

The oil supply hole includes a lower end supply hole formed in an axial direction in the center of the rotating shaft, and an upper end supply hole communicating with the lower end supply hole and eccentrically formed on the rotating shaft, wherein the oil scattering flow path is a sidewall of the lower end supply hole. An inlet is formed and an outlet is formed on the outer periphery of the rotating shaft, and the outlet is opened toward the lower end of the power generating unit.                     

The oil fly flow path is formed at a position where the outlet is relatively higher than the inlet.

The oil scattering flow passage is conformally arranged along the circumferential direction with respect to the center of the rotation axis.

According to the present invention having the configuration as described above, by supplying oil to the lower end of the power generating portion there is an effect that the power generating portion that generates a lot of heat is cooled.

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.

As shown in the figure, the casing 20 is composed of the upper cap 21, the outer shell 23 and the lower cap 25 to form a closed space therein. One side of the casing 20 is provided with a suction pipe 28 for sucking the working fluid from the outside and a discharge pipe 29 for discharging the compressed working fluid. And on the lower cap 25 of the casing 20 is formed an oil storage unit 27 for storing a certain amount of oil for lubrication and cooling of each part.

The power generator 30 is installed inside the casing 20 and provides power for compressing the working fluid. The power generator 30 includes a stator 31 and a rotor 33. Here, the stator 31 is installed between the upper frame 80 and the lower frame 90 to be described below and is fixed inside the casing 20. The rotor 33 is rotatably installed inside the stator 31. That is, the rotor 33 rotates by electromagnetic interaction with the stator 31.                     

The rotary shaft 40 is installed at the center of the power generator 30 to rotate by the power generator 30. That is, by transmitting the rotational force of the rotor 33 to the compression mechanism (50) to be described below, it is press-fit fixed to the rotor 33 so as to rotate simultaneously with the rotor (33).

An eccentric portion 41 is formed at an upper end of the rotating shaft 40 at an eccentric position in the center of the rotating shaft 40. The boss portion 53b of the turning scroll 53 to be described below is inserted into the eccentric portion 41, and the turning scroll (because of the circumferential movement of the eccentric portion 41 according to the rotation of the rotating shaft 40) 53) is the turning movement.

An oil feeder 43 is provided at a lower end of the rotating shaft 40, and an oil supply hole 45 is formed in the axial direction. The oil feeder 43 is installed at the lower inlet of the oil supply hole 45, and the oil stored in the oil storage part 27 is rotated with the rotation of the rotary shaft 40. To rise).

The oil supply hole 45 is formed to penetrate along the axial direction of the rotation shaft 40 to supply oil stored in the oil storage unit 27 to an upper end of the rotation shaft 40. The oil supply hole 45 is in communication with the lower end supply hole (45a) and the lower end supply hole (45a) formed in the axial direction in the center of the rotation shaft 40 is formed eccentrically with respect to the rotation center of the rotation shaft 40 It consists of an upper supply hole 45b.

On the side wall of the lower supply hole 45a, an oil splash flow passage 47 penetrating to the outside of the rotating shaft 40 is formed. The oil scattering flow path 47 is to cool the overheated power generating part 30 by causing the oil to be scattered by the power generating part 30, and conformally along the circumferential direction with respect to the center of the rotating shaft 40. One or more are formed. At this time, the oil scattering passage 47 is formed to be inclined upwardly so that oil can be scattered far by using the centrifugal force by the rotating shaft 40 to the maximum. That is, the oil scattering passage 47 has an outlet on the outer circumferential side of the rotation shaft 40 relatively higher than the inlet on the lower side supply hole 45a and opens toward the bottom of the stator 31.

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.

And the revolving scroll (53) is provided rotatably with respect to the fixed scroll (51) at the bottom of the fixed scroll (51). The orbiting scroll 53 is provided with the same involute orbiting scroll scraps 53a formed corresponding to the fixed scroll scraps 51a, and the fixed scroll scraps 51a and the pivoting scroll scraps 53a are engaged with each other to be compressed. It is installed to form the space P.

The boss portion 53b is formed on the bottom of the turning scroll 53. The boss portion 53b is to be inserted into the eccentric portion 41 of the upper end of the rotation shaft 40, the rotational force of the rotation shaft 40 is transmitted to allow the pivoting scroll 53 to pivot. The oil supplied from the oil supply hole 45 of the rotating shaft 40 is lubricated by the friction portion between the boss portion 53b and the eccentric portion 41.

The old dam ring 55 serves to convert the rotational motion of the rotational shaft 40 into the rotational motion, and is provided between the upper frame 80 and the rotational scroll 53 to be described below.

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

The upper frame 80 supports the compression mechanism 50 at the bottom of the compression mechanism 50. The upper frame 80 is fixed to the inner circumferential surface of the casing 20, the fixing scroll 51 of the compression mechanism 50 is fixed to the upper portion. The orbiting scroll 53 which is engaged with the fixed scroll 51 is rotatably seated on the upper surface of the upper frame 80. Therefore, a thrust bearing surface 81 is provided on the upper surface of the upper frame 80 so that the pivoting scroll 53 pivots with the upper frame 80 with minimal metal friction.

The upper end of the rotating shaft 40 is penetrated to the center of the upper frame 80. At this time, a part of the oil supplied through the oil supply hole 45 of the rotating shaft 40 is supplied to the thrust bearing surface 81 by centrifugal force. In addition, an oil passage 83 is formed in the upper frame 80 so as to communicate with the outside so that oil flowing out to the upper end of the rotating shaft 40 may be recovered to the oil storage unit 27.

The lower frame 90 supports the lower end of the rotation shaft 40, and the rotation shaft 40 is inserted into an approximately center of the lower frame 90. At least a portion of the lower frame 90 is immersed in the oil stored in the oil reservoir 27. Therefore, the lower end of the rotating shaft 40 inserted into the lower frame 90 is located below the oil level. This is to allow the oil feeder 43 formed at the lower end of the rotating shaft 40 to suck oil through the oil supply hole 45.

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

When power is supplied to the power generator 30, the rotor 33 rotates by the interaction between the stator 31 of the power generator 30 and the rotor 33 installed inside the stator 31. do. The rotation force generated at this time is transmitted to the rotating shaft 40, the rotating shaft 40 is a rotational movement of the rotary shaft 40 is rotated by the old dam ring 55 mounted on the upper portion of the rotary shaft 40 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 40 so that the crescent shaped compression space P is continuously generated. In addition, the compression space (P) is larger toward the outside and smaller toward the center, so that the working fluid sucked through the suction pipe (28) 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.

And the oil stored in the oil reservoir 27 of the lower cap 25 during the compression as described above iterates over each part of the scroll compressor according to the present invention as indicated by the arrow of FIG. In other words, the oil is sucked by the oil feeder 43 that rotates with the rotation of the rotation shaft 40. The oil sucked in this way rises along the lower end supply hole 45a and fills the lower end supply hole 45a.

At this time, some of the oil sucked into the upper supply hole (45b) is introduced into the oil fly flow path 47 formed on the side wall of the lower supply hole (45a). The oil introduced in this way is gradually eccentric at the center of the rotary shaft 40 while passing along the oil scattering flow passage 47, so that the centrifugal force is relatively higher than at the center of the rotary shaft 40. Therefore, when the oil moves quickly along the oil fly flow passage 47 and exits the oil fly flow passage 47, it is scattered by the centrifugal force and the inclination angle of the oil fly flow passage 47. The path of the oil scattering is so close to the parabola is to be sprayed on the lower end of the power generating portion (30). In particular, since a lot of heat is generated in the stator 31, the stator 31 is cooled by the oil sprayed as described above.

The oil filling the lower supply hole (45a) is introduced into the upper supply hole (45b), because the upper supply hole (45b) is located eccentrically to the rotary shaft 40, the oil by the rotation of the rotary shaft 40 Ascending to the upper end of the rotary shaft 40 by the centrifugal force is supplied to the compression mechanism (50). In this way, the oil supplied to the compression mechanism (50) is friction between the upper frame (80) and the turning scroll (53) via the boss (53b) of the turning scroll (53) and the eccentric portion (41) of the rotating shaft (40). Supplied to the site for lubrication.

In addition, the oil supplied to the compression mechanism unit 50 moves to the edge of the upper frame 80 through an oil passage 83 formed in the upper frame 80. That is, the oil moves to the outlet side of the oil passage 83 by the hydraulic pressure of the oil continuously entering the oil passage 83. Thereafter, the oil separated from the drainage passage 83 flows along the inner circumferential surface of the casing 20 and returns to the oil storage part 27.

In the present invention as described above, the oil fly flow passage 47 has been exemplified that the outlet has a relatively high linear shape compared to the inlet, but is not limited thereto. For example, the oil scattering flow passage 47 may be configured such that the outlet is formed relatively higher than the inlet and spirals from the inlet to the outlet.

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, according to the present invention, at least one oil scattering flow passage penetrated to the side wall of the lower end supply hole is formed along the circumferential direction of the rotating shaft, so that oil is scattered by the centrifugal force of the rotating shaft and sprinkled onto the power generating unit. Therefore, according to the present invention, the oil is supplied to the lower end of the power generating unit has an effect that the overheated power generating unit is cooled.                     

In particular, the present invention has the advantage that the power generator is operated stably by cooling the heat generated from the stator constituting the power generator through the oil.

In addition, the present invention has the effect of increasing the compression efficiency of the working fluid by maintaining a relatively stable temperature range of the coil to reduce the extent that the working fluid flowing into the suction pipe absorbs the stator heat relatively.

Claims (4)

A casing in which an airtight space is formed and a certain amount of oil is stored at the bottom, A power generating unit 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 sucking oil stored at the lower end of the casing through an oil supply hole formed therein by the rotational force of the oil feeder and the centrifugal force generated when the power generating unit rotates; A compression mechanism unit installed at an upper end of the rotating shaft and lubricating the contact surface with the rotating shaft with oil supplied from the oil supply hole and compressing the working fluid according to the rotation of the rotating shaft; An upper frame having a drainage path for supporting the compressor mechanism and allowing oil sucked through the rotating shaft to move to an edge; At least a part is submerged in the oil stored in the casing and includes a lower frame is inserted into and supported by the lower end of the rotating shaft, And at least one oil scattering flow passage formed on the side wall of the oil supply hole so that a portion of the oil sucked up is scattered to the power generating unit. The oil supply hole of claim 1, wherein the oil supply hole includes a lower end supply hole formed in an axial direction at the center of the rotation shaft, and an upper end supply hole communicating with the lower end supply hole and eccentrically formed on the rotation shaft. The oil scattering flow passage is formed with an inlet is formed on the side wall of the lower supply hole, the outlet is formed on the outer periphery of the rotating shaft, the outlet is a scroll compressor, characterized in that opening toward the lower end of the power generating unit. The scroll compressor according to claim 1 or 2, wherein the oil fly flow passage is formed at a position where the outlet is relatively higher than the inlet. The scroll compressor as set forth in claim 3, wherein the oil fly flow passage is conformally arranged along the circumferential direction with respect to the center of the rotation shaft.

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