KR20190005590A - Compressor having seperated oil retrun flow path and refrigerant flow path - Google Patents

Abstract

The present invention relates to a compressor to separate an oil return flow path and a refrigerant flow path to reduce an oil shortage caused by an oil return delay. According to the present invention, the compressor comprises a flow path guide guiding refrigerant to a space between insulators of a stator to provide a structure which can prevent refrigerant discharged from a compression unit from flowing into the oil return flow path. The flow path guide has an internal wall unit and an external wall unit, and the external wall unit is formed to be overlapped with an external plate of the insulators to improve airtightness of the refrigerant flow path.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a compressor that separates a refrigerant discharge flow passage and an oil return flow passage,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a compressor in which a refrigerant discharge flow path and an oil return flow path can be separated.

Generally, compressors are applied to vapor compression refrigeration cycles such as refrigerators and air conditioners.

Compressors can be divided into reciprocating, rotary, and scroll types depending on the method of compressing the refrigerant.

The reciprocating compressor is a system in which the piston drive compresses the refrigerant while moving the piston linearly.

The rotary compressor compresses the refrigerant using a rolling piston eccentrically rotating in the compression space of the cylinder and a vane separating the compression space of the cylinder into the suction chamber and the discharge chamber in contact with the rolling piston.

In the scroll compressor, a fixed scroll is fixed to an inner space of a closed container, and the orbiting scroll is engaged with the orbiting scroll to perform a swing motion. The scroll compressor includes two suction chambers, a middle pressure chamber, And a pair of compression chambers are continuously formed.

The scroll compressor is widely used for compressing refrigerant in an air conditioner or the like because it can obtain a relatively high compression ratio as compared with other types of compressors, and smooth suction, compression, and discharge strokes of the refrigerant can be obtained and stable torque can be obtained.

On the other hand, the compressor can be classified into an upper compression type or a lower compression type depending on the positions of the driving motor and the compression portion. The upper compression method is a method in which the compression part is located above the drive motor, and the lower compression method is a compression method in which the compression part is located below the drive motor. In particular, in the case of the lower compression type, the refrigerant discharged to the inner space of the casing moves to the discharge tube where the casing is located, while the oil is conversely recovered to the oil storage space provided below the compression portion. It may be discharged to the outside or pushed by the pressure of the refrigerant, thereby stagnating on the upper side of the driving motor.

The present invention relates to a scroll compressor (hereinafter, abbreviated as a lower compression scroll compressor) which is a high pressure type and which is a lower compression type, as a technique of separating a flow path through which oil is recovered from a casing and a flow path through which refrigerant is discharged, Explain.

1 is a sectional view showing an example of a conventional lower compression scroll compressor.

As shown in the drawings, a conventional lower compression scroll compressor includes a driving motor 2 provided in an inner space of a casing 1 and having a stator and a rotor, a compression unit (not shown) provided below the driving motor 2, (3), and a rotary shaft (5) for transmitting the rotational force of the drive motor (2) to the compression section (3). A refrigerant discharge pipe (16) is provided on the upper portion of the casing (1).

The refrigerant discharged from the compression section 3 is guided to move toward the refrigerant discharge pipe 16 on the inner peripheral surface of the casing 1 and the outer peripheral surface of the drive motor 2 or inside the drive motor 2 At the same time, a flow path Pm for guiding the oil separated from the refrigerant in the upper space of the drive motor 2 to be recovered to the oil storage space V3 under the compression section 3 is formed.

The conventional lower compression scroll compressor is configured such that the refrigerant and oil discharged from the compression section 3 are moved to the upper side of the drive motor 2 through the oil passage Pm provided in the drive motor 2 And is discharged to the outside of the compressor through the refrigerant discharge pipe (16).

At this time, the oil separated from the refrigerant between the driving motor 2 and the compression part 3 moves to the oil storage space V3 through the oil passage Pc provided in the compression part 3, while the driving motor 2 The oil separated from the refrigerant on the upper side of the compressor 3 is moved to the oil storage space V3 on the lower side of the compressor through the oil passage Pm provided in the drive motor 2 and the oil passage Pc provided in the compression portion 3 .

However, in the conventional lower compression scroll compressor as described above, the refrigerant and the oil move together from the upper side to the lower side of the driving motor 2 as the refrigerant and the oil move together through the flow path Pm provided in the driving motor 2 The oil mixed with the refrigerant discharged from the compression unit 3 can be discharged to the outside of the compressor together with the refrigerant.

Or the oil can be stagnated in the upper space of the driving motor 2 without passing through the flow path Pm of the driving motor 2 by the high-pressure refrigerant. Then, the amount of oil recovered in the oil storage space V3 is sharply reduced, and the oil supply amount supplied to the compression unit 3 is reduced, resulting in friction loss and wear of the compression unit.

The oil supplied to the compression section 3 through the oil passage of the rotary shaft 5 to lubricate the compression section 3 and the oil flowing into the space between the drive motor 2 and the compression section 3, The refrigerant is mixed with the refrigerant discharged from the compression section 3, moved to the upper side of the drive motor 2 together with the refrigerant, and discharged to the outside of the compressor, which further increases the oil shortage inside the compressor.

An object of the present invention is to provide a scroll compressor in which a refrigerant passage and an oil circulation passage are separated from each other in a casing so that oil can be smoothly recovered into the oil storage space.

Another object of the present invention is to provide a scroll compressor which lubricates the compression portion and prevents the oil flowing into the space between the compression portion and the drive motor from mixing with the refrigerant discharged from the compression portion to smoothly recover the oil.

The scroll compressor according to the embodiment of the present invention is provided with a flow guide between the drive motor and the compression section to guide the refrigerant discharged from the compression section to the inside of the flow guide to separate the oil recovery flow passage and the refrigerant flow passage Structure.

The flow path guide is formed so as to be in surface contact with the insulator of the drive motor so as to overlap with the insulator of the drive motor, thereby preventing the refrigerant discharged from the compression portion from flowing into the oil recovery flow path.

The compressor according to the present invention provides a structure in which the refrigerant discharged from the compression unit moves to the refrigerant discharge pipe through the refrigerant passage and the oil separated from the upper side of the driving motor can smoothly move to the storage space through the oil passage . Therefore, the flow path through which the refrigerant is discharged and the flow path through which the oil is recovered are separated from each other, so that the flow of the oil is not hindered by the refrigerant. As a result, the oil can be smoothly recovered to the oil-filled space, and the oil shortage can be prevented during operation of the compressor.

In addition, the compressor according to the present invention lubricates the compression portion and prevents the oil flowing out from being mixed with the refrigerant discharged from the compression portion, and is also collected into the oil storage space through a separate recovery oil passage, It is possible to prevent the occurrence of the problem.

1 is a sectional view for explaining the flow of refrigerant and oil in a conventional compressor.
2 is a longitudinal sectional view for explaining a structure of a scroll compressor according to a first embodiment of the present invention.
3 is a perspective view illustrating a flow guide of a scroll compressor according to a first embodiment of the present invention.
4 is a view for explaining a refrigerant passage and an oil recovery passage of a scroll compressor according to a first embodiment of the present invention.
5 is a view for explaining a refrigerant passage and an oil recovery passage of a scroll compressor according to a second embodiment of the present invention.
6 is a view for explaining a refrigerant passage and an oil recovery passage of a scroll compressor according to a third embodiment of the present invention.
7 is a view for explaining a refrigerant passage and an oil recovery passage of a scroll compressor according to a fourth embodiment of the present invention.
8 is a view for explaining a refrigerant passage and an oil recovery passage of a scroll compressor according to a fifth embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a compressor having improved lubrication performance according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a longitudinal sectional view for explaining a structure of a scroll compressor according to a first embodiment of the present invention.

The scroll compressor of the illustrated embodiment corresponds to a hermetic compressor in which a drive motor and a compression section are provided together in a closed casing and corresponds to a lower compression compressor because the compression section is located below the drive motor.

The scroll compressor according to the present embodiment includes a casing 210 for sealing an inner space, a driving motor 220 disposed at an upper portion of the inner space, a compression unit 200 disposed at a lower portion of the driving motor, And a rotation shaft 226 for transmitting the rotational force of the driving motor 220 to the compression unit 200.

Hereinafter, each configuration will be described in more detail.

[Casing (210)]

The casing 210 serves to seal the inner space, and the upper and lower portions may be formed into a closed cylindrical shape.

The casing 210 includes a cylindrical shell 211 corresponding to an intermediate portion thereof, an upper shell 212 coupled to the upper portion of the cylindrical shell 211, and a lower shell 214 coupled to the lower portion of the cylindrical shell 211 .

The inner space of the casing 210 is a lower space of the upper shell 212 and a first space V1 which is the upper side of the driving motor 220 and a second space V1 between the driving motor 220 and the compression unit 200 A third space V3 corresponding to the lower portion of the fixed scroll 250 and the discharge cover 270 and a fourth space V3 corresponding to the lower portion of the discharge cover 270 and the upper portion of the lower shell 214. [ (V4).

The upper shell 212 is provided with a refrigerant discharge pipe 216. The inlet of the refrigerant discharge pipe 216 is disposed in the first space V1.

The refrigerant compressed in the compression unit 200 is discharged to the second space V2 and the refrigerant discharged into the second space V2 passes through the driving motor 220 and moves to the first space V1, And discharged through the refrigerant discharge pipe 216 disposed in the first space V1.

At this time, it is preferable to prevent the oil from flowing out together with the refrigerant through the refrigerant discharge pipe 216. When the oil to be circulated in the compressor flows out through the refrigerant discharge pipe 216, the amount of oil circulating in the compressor is reduced, thereby reducing the effect of lubrication and cooling.

To this end, an oil separator (not shown) for separating the oil can be connected to the refrigerant discharge pipe 216.

The fourth space V4 under the lower shell 214 serves as a storage space for storing the oil. In other words, the fourth space V4 serves as an oil chamber for temporarily storing the oil supplied in the lubricating period required for oil supply within the compressor. During operation of the compressor, the oil stored in the fourth space (V4) is supplied to the oil supply required period and circulated. When the compressor stops, the oil collects in the fourth space (V3).

On the other hand, a refrigerant suction pipe 218, which is a passage through which the refrigerant to be compressed flows, is installed on the side surface of the cylindrical shell 211. The refrigerant suction pipe 218 passes through the side surface of the fixed scroll 250 and is connected to the compression chamber S1.

The refrigerant flowing through the refrigerant suction pipe 218 has a relatively lower pressure than the refrigerant discharged through the refrigerant discharge pipe 216. Hereinafter, the pressure of the refrigerant flowing through the refrigerant suction pipe 218 is referred to as low pressure, the refrigerant discharged through the refrigerant discharge pipe 216 is referred to as high pressure, and the pressure therebetween is referred to as intermediate pressure.

[Driving Motor 220]

The compressor according to the present embodiment is a lower compression type in which a driving motor 220 for driving the compression unit 200 is disposed on the upper side in the internal space of the casing 210. Of course, in the case of the upper compression type compressor, the driving motor is disposed on the lower side in the inner space of the casing 210.

The drive motor 220 includes a stator and a rotor 224. The stator is formed in a cylindrical shape so that the outer circumferential surface of the stator is fixed to the inner surface of the casing 210. The stator includes an iron core 222 which is formed in a substantially annular shape and has a plurality of sheets stacked, and a coil 222a which is wound around the iron core 222. The stator is provided with an insulator 223 for insulating the coil 222a and the iron core 222 from each other.

The stator has a plurality of slots formed along the circumferential direction on its inner circumferential surface, and the coil 222a is wound on the slots.

An oil return flow path 212a may be provided on the outer circumferential surface of the stator.

The oil recovery passage 212a provides a path through which the refrigerant separated in the first space V1 can pass through the drive motor 220 and move to the oil storage space. The rotor 224 rotates inside the stator and generates rotational power. The rotary power generated by the rotor 224 is transmitted to the compression unit 200 through the rotary shaft 225. The rotating shaft 225 is coupled to the rotor 224 and rotates integrally with the rotor 224.

[Compression unit 200]

The compression unit 200 includes a main frame 230, a fixed scroll 250, a orbiting scroll 240, and a discharge cover 270.

[Main Frame (230)]

The main frame 230 forms the upper portion of the compression unit 200 and faces the lower portion of the driving motor 220.

The main frame 230 includes a frame end plate portion 232 and a frame side wall portion 231.

The frame holding plate 232 is formed in a substantially circular shape and has a frame bearing part 232a at the center thereof. The frame bearing portion 232a is a portion through which the rotating shaft passes. The frame bearing part 232a may protrude from the upper surface of the frame holding part 232 toward the driving motor 220 and may be rotatably coupled to the main bearing part MB of the rotating shaft 226. [

The frame side wall portion 231 extends to the fixed scroll side and the lower end portion thereof is engaged with the fixed scroll 250. The outer circumferential portion of the frame side wall portion 231 is engaged with the cylindrical shell 211 of the casing 210.

The frame side wall portion 231 has a frame discharging hole 231a penetrating the inside thereof in the axial direction (longitudinal direction). The frame discharge hole 231a provides a passage through which the compressed refrigerant can move from the third space V3 to the second space V2. The frame discharge hole 231a is connected to the fixed scroll discharge hole 256b provided in the fixed scroll 250.

The main frame 230 is coupled to the fixed scroll 250 and the main frame 230 is disposed between the fixed scroll 250 and the orbiting scroll 240 so as to be pivotable.

A back pressure chamber S2 is formed between the bottom surface of the main frame 230 and the orbiting scroll 240. [ The back pressure chamber S2 includes an intermediate pressure region having a pressure between a low pressure and a high pressure. The orbiting scroll 240 is brought into close contact with the fixed scroll 250 by the pressure of the back pressure chamber S2.

Oldham's ring 150 is provided between the main frame 230 and the orbiting scroll 240. The oralling 150 serves to make the orbiting scroll 240 rotate only without turning.

[Fixed scroll (250)]

The fixed scroll 250 includes a fixed plate portion 254, a fixed scroll sidewall portion 255, a fixed lap 251, and a fixed scroll bearing portion 252.

The fixed plate portion 254 has a substantially circular shape. The fixed plate 254 is provided with a discharge port 253 for discharging the refrigerant compressed in the compression chamber S1.

The fixed scroll sidewall portion 255 extends from the outer peripheral portion of the fixed end plate portion 254 to the main frame side and is connected to the main frame side wall portion 231.

The fixed wraps 251 are formed so as to protrude toward the upper side of the fixed plate portion 254. The fixed wraps 251 engage with the orbiting wraps 241 of the orbiting scroll 240 to form the compression chambers S1.

The fixed scroll bearing portion 252 is formed at the center of the fixed plate portion 254 and passes through the rotating shaft 225.

Meanwhile, a discharge cover 270, which accommodates the refrigerant discharged from the compression chamber and divides the third space V3, is coupled to the bottom surface of the fixed scroll 250.

The fixed scroll sidewall portion 255 has a fixed scroll discharge hole 256b connected to the frame discharge hole 231a. The frame discharging hole 231a and the fixed scroll discharging hole 256b allow the refrigerant discharged from the compression chamber S1 to the third space V3 which is the inner space of the discharge cover 270 to flow into the second space V2 .

The fixed scroll bearing portion 252 may protrude from the lower surface of the fixed plate portion 254 toward the oil storage space V4. At this time, the fixed scroll rollers 252 may be bent toward the center side so that the lower end supports the lower end of the sub bearing portion SB of the rotation shaft 226 to form the thrust bearing surface.

[Discharge Cover (270)]

The discharge cover 270 serves to prevent the refrigerant discharged from the discharge port 253 provided in the fixed plate 254 from mixing with the oil stored in the fourth space V4. The discharge cover 270 is coupled to seal the space between the fixed scroll 250 and the bottom surface.

The discharge cover 270 has a through hole 276 through which the oil feeder 271 passes. The oil feeder 271 is coupled to the sub bearing portion SB of the rotary shaft 226 and is immersed in the oil stored in the oil storage space of the casing 210.

[Turn Scroll (240)]

The orbiting scroll 240 is disposed between the main frame 230 and the fixed scroll 250 and is coupled to the eccentric portion EC of the rotating shaft 226. The orbiting scroll 240 pivots by the rotation of the rotating shaft 226.

The orbiting scroll 240 includes a turning plate portion 245, a orbiting wrap 241, and a rotating shaft coupling portion 242.

The turning plate section 245 has a substantially circular shape and faces the fixed plate section 245.

The orbiting wrap 241 protrudes from the bottom surface of the swivel plate 245 toward the fixed plate 245 and engages with the stationary wrap 251. The lower surface of the orbiting wrap (241) is in close contact with the upper surface of the fixed plate portion (254).

The rotary shaft engaging portion 242 is disposed at the center of the turn hard plate portion 245 and is rotatably coupled to the eccentric portion EC of the rotary shaft. The rotary shaft coupling portion 242 is formed at a height that overlaps with the orbiting wrap 241 and is connected to the orbiting wrap 241. The rotary shaft coupling portion 242 is connected to the orbiting wrap 241 to form the compression chamber S1 together with the fixed wraps 251 during the compression process.

When the refrigerant is compressed, the repulsive force of the refrigerant is applied to the fixed lap 251 and the orbiting wrap 241, and a compressive force is applied between the rotary shaft engaging portion 242 and the eccentric portion EC as a reaction force thereto.

The scroll compressor according to the embodiment of the present invention has a structure in which the eccentric part EC of the rotating shaft 226 passes through the turning plate portion 245 of the orbiting scroll 240 and overlaps with the orbiting wrap 241 in the radial direction I have. In this structure, the repulsive force and the compressive force of the refrigerant are applied on the same plane with respect to the turning plate portion 245. Accordingly, since the repulsive force and the compressive force of the refrigerant are canceled each other, the tilting of the orbiting scroll 240 can be reduced.

[Rotation shaft 226]

And serves to transmit the rotational force of the driving motor 220 of the rotary shaft 226 to the compression unit 200 and to provide the oil passage.

The upper portion of the rotary shaft 226 is integrally coupled to the rotor 224 of the drive motor 220 and the lower portion of the rotary shaft 226 is rotatably coupled to the compression portion 200.

The rotary shaft 226 has a main bearing portion MB, a sub bearing portion SB, an eccentric portion EC, an oil supply passage 226a, oil supply holes H1, H2, H3, H4, , And oil supply grooves (G1, G2).

The oil supply passage 226a is provided axially at the center of the rotary shaft. The oil supply passage 226a provides a path through which the oil stored in the oil storage space V4 can move upward.

The main bearing part MB is coupled to the frame bearing part 232a of the main frame 230. The sub bearing portion SB is coupled to the fixed scroll bearing portion 252 of the fixed scroll 250. The eccentric part EC is disposed between the main bearing part MB and the sub bearing part SB and is coupled to the rotary shaft coupling part 242 of the orbiting scroll 240.

The main bearing portion MB, the sub bearing portion SB, and the eccentric portion EC all have a circular cross section. The diameter of each part can be set differently.

The shaft center of the sub bearing portion SB coincides with the shaft center of the main bearing portion MB and the shaft center of the eccentric portion EC is formed to be eccentric with respect to the shaft center of the main bearing portion MB . In other words, the main bearing part MB and the sub bearing part SB are coaxially formed so as to have the same axial center, and the eccentric part EC is formed in a circular shape at an eccentric position with respect to the axial center of the main bearing part MB As shown in Fig.

The eccentric part EC may have an outer diameter smaller than the outer diameter of the main bearing part MB and larger than an outer diameter of the sub bearing part SB. This is for the purpose of improving the assembling property when the rotary shaft 226 is coupled to the compression portion 200.

The oil supply passage 226a is provided inside the rotary shaft 226 to provide a path for supplying the oil stored in the oil storage space V4 to the bearings MB and SB and the eccentric part EC. The bearings MB and SB and the eccentric part EC serve to reduce the frictional force by supplying the oil to the parts where friction with the compression part 200 occurs when the rotary shaft 226 rotates. When the oil is supplied to the friction portion, the frictional force is reduced and the power loss is reduced. The oil also has the effect of cooling the friction zone.

The oil supply passage 226a is provided axially inside the rotary shaft 226, and the oil supply required section (bearing portion, eccentric portion, etc.) requiring oil supply is the outer peripheral surface of the rotary shaft. Therefore, the oil supply hole is formed through the outer peripheral surface of the rotary shaft and connected to the oil supply passage 226a in the oil supply required period.

Specifically, the oil supply hole includes a first oil supply hole formed to penetrate the outer peripheral surface of the main bearing portion MB, a second oil supply hole H2 formed to penetrate the outer peripheral surface of the eccentric portion EC, And a third oil feed hole H3 formed so as to pass through an outer circumferential surface of the third oil feed hole H3.

The oil supply groove is provided for uniformly supplying oil to the oil supply required section (bearing portion, eccentric portion), and may be provided in the form of a concave groove on the outer peripheral surface of the oil supply required section.

As a result, the oil guided upward through the oil supply passage 226a is discharged through the first lubrication hole and supplied to the outer peripheral surface of the main bearing portion MB, discharged through the second lubrication hole H2, Is supplied to the outer circumferential surface of the deep portion EC, is discharged through the third oil supply hole H3, and is supplied to the outer peripheral surface of the sub bearing portion SB in the vertical direction.

The oil guided through the oil supply passage 226a is discharged through the fourth oil supply hole H4 and supplied to the upper surface of the orbiting scroll 240 and discharged through the fifth oil supply hole H5, (240) and the fixed scroll (250). The oil supplied to the inside of the compression chamber has the effect of improving the airtightness of the compression chamber.

An oil feeder 271 for pumping the oil stored in the fourth space V4 may be coupled to the lower end of the rotary shaft 226, that is, the lower end of the sub bearing portion SB.

The oil feeder 271 includes an oil supply pipe 273 inserted into the oil supply passage 226a of the rotary shaft 226 and an oil supply pipe 273 inserted into the oil supply pipe 273, 274).

Here, the oil supply pipe 273 is provided so as to pass through the through hole 276 of the discharge cover 270 and to be submerged in the oil storage space V4.

Although not shown in the drawing, a trochoid pump (not shown) may be coupled to the sub-bearing portion SB to force the oil filled in the oil storage space V4 upward, instead of the oil feeder 271 have.

A balance weight 227 for suppressing noise vibration may be coupled to the rotary shaft 226. For reference, the balance weight 227 may be provided between the driving motor 220 and the compression unit 200, that is, in the second space V2.

The operation of the scroll compressor according to the embodiment of the present invention will now be described.

When the power is applied to the driving motor 220, the rotating shaft 226 coupled with the rotor 224 of the driving motor 220 rotates. The orbiting scroll 240 eccentrically connected to the rotary shaft 226 performs the orbiting motion and the compression chamber S1 formed between the orbiting wrap 241 and the stationary wrap 251 moves while changing the volume. At this time, the compression chamber S1 can be formed in several stages in succession as the volume gradually decreases toward the center direction.

The refrigerant is compressed while moving and discharged to the third space V3 through the discharge port 253 of the fixed scroll 250 by the orbiting motion of the orbiting scroll 240. [

The high pressure refrigerant discharged into the third space V3 flows through the fixed scroll 250 and the fixed scroll discharge hole 256b formed to be connected to the main frame 230 and the second space V2 through the frame discharge hole 231a. . The refrigerant discharged to the second space V2 passes through the driving motor 200 and ascends to the first space V1 and then flows through the refrigerant discharge tube 216 in the first space V1 to the outside of the casing 210 .

The present invention is characterized in that the flow path guide 300 is provided in the second space V2. The flow guide 300 guides the refrigerant discharged from the compression unit to the space between the insulators 223 so that the refrigerant discharged from the compression unit can rise through the core hole of the stator.

Further, the flow guide 300 serves to prevent the refrigerant discharged from the compression unit from flowing into the oil return flow path 212a between the drive motor and the casing, thereby separating the oil return flow path and the refrigerant flow path do.

FIG. 3 is a perspective view of a flow guide of a scroll compressor according to a first embodiment of the present invention, and FIG. 4 is a view for explaining a refrigerant passage and an oil recovery passage of a scroll compressor according to a first embodiment of the present invention.

3 and 4, the flow guide 300 of the scroll compressor according to the first embodiment of the present invention includes a bottom portion 302 which is in close contact with the upper surface of the main frame, an outer wall portion provided along the outer side of the bottom portion, (304), and an inner wall portion (306) provided along the inner side of the bottom portion.

The bottom portion 302 is formed in an annular shape so as to overlap the frame discharge hole 231a provided on the upper surface of the main frame.

The bottom part 302 is provided with a through hole 301 communicating with the frame discharging hole 231a.

The outer wall portion 304 of the flow guide 300 is preferably formed to have a height that can be superimposed on the insulator outer plate 223a.

The inner wall portion 306 of the flow guide 300 is preferably formed so that the upper end faces the insulator inner plate 223b.

The inner wall portion 306 is disposed so as to surround the outer periphery of the weight balance 227.

The insulator 223 provided above and below the stator of the fixed motor includes an inner plate 223b close to the rotating shaft and an outer plate 223a close to the casing.

The refrigerant is supplied to the core 223b between the inner plate 223b and the outer plate 223a of the insulator 223 by allowing the flow path guide 300 to seal a space between the inner plate 223b and the outer plate 223a of the insulator 223, (Not shown).

This structure prevents the refrigerant discharged through the frame discharging hole 231a from flowing into the oil returning flow path 212a, thereby making it possible to smoothly recover the oil.

The outer wall portion 304 of the flow path guide 300 is formed with the outer surface of the insulator outer plate 223a and the inner surface of the outer surface of the insulator outer plate 223a in order to more reliably block the refrigerant discharged from the frame discharging hole 231a from flowing into the oil returning flow path 212a. It is preferable to make surface contact.

5 is a view for explaining a refrigerant passage and an oil recovery passage of a scroll compressor according to a second embodiment of the present invention.

The scroll compressor according to the second embodiment of the present invention further includes a sealing member 304b in the flow guide 300 to further improve the airtightness of the refrigerant passage.

The outer wall portion 304 of the flow path guide 300 has a section overlapping with the outer wall 223a of the insulator 223. In other words, the outer wall portion 304 of the flow guide 300 overlaps the outer surface of the insulator outer wall 223a. The sealing member 304b is inserted into the sealing groove 304a so that the sealing member 304b is inserted into the flow path guide outer wall portion 304 and the insulator outer wall 304 223a.

This structure brings about an effect that the sealing member 304b can ensure the airtightness regardless of the protrusion or the groove even if grooves or projections exist between the insulator outer wall 223a.

6 is a view for explaining a refrigerant passage and an oil recovery passage of a scroll compressor according to a third embodiment of the present invention.

The scroll compressor according to the third embodiment of the present invention is such that the outer wall portion 304 of the flow guide 300 is brought into close contact with the lower end surface of the iron core 222.

In other words, the outer wall portion 304 completely encloses the insulator outer wall 223a and is brought into close contact with the iron core, so that the refrigerant discharged through the frame discharging hole 231a is prevented from flowing out. At this time, a sealing member 304b may be provided between the iron core and the outer wall 304 to improve airtightness.

Even in the case of the third embodiment, airtightness can be ensured even if protrusions or grooves are provided in the outer wall 223a of the insulator, and the airtightness can be ensured even if a section of the outer wall 223a of the insulator is generated .

FIG. 7 is a view for explaining a refrigerant passage and an oil return passage of a scroll compressor according to a fourth embodiment of the present invention, and FIG. 8 is a sectional view showing a refrigerant passage of the scroll compressor according to the fifth embodiment of the present invention, Fig.

The outer wall portion of the flow path guide 300 may have a step 304_3 corresponding to the outer wall portion of the flow path guide 300 or the outer wall portion of the double wall 304_1, 304_2).

The outer wall portion of the flow path guide 300 may be formed as a double wall 304_1 or 304_2 and the sealing member 304b having a U-shaped cross section may be coupled to the upper end of the inner outer wall 304_4 as shown in Fig. have.

Alternatively, as shown in Fig. 8, a step difference surface 304_3 may be provided on the outer wall portion 304 of the flow guide 300 to make surface contact with the step of the insulator outer plate. At this time, the sealing member 304b may be inserted into the inner surface of the outer wall portion 304 of the flow path guide 300 to further improve airtightness.

It is to be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and the scope of the present invention will be indicated by the appended claims rather than by the foregoing detailed description.

100: Scroll compressor
200: compression section 210: casing
220: drive motor 226:
MB Main bearing part SB: Sub bearing part
EC: Eccentric part 230: Main frame
240: orbiting scroll 241: orbiting wrap
250: fixed scroll 251: stationary wrap
270: Discharge cover 271: Oil feeder
300: flow guide 303: bottom part
304: outer wall part 306: inner wall part

Claims (12)

A casing having an internal space;
A drive motor having a stator fixed inside the casing and a rotor rotatable inside the stator;
A compression unit provided at one side of the driving motor and having a discharge hole for discharging the compressed refrigerant into the internal space of the casing;
A rotating shaft for transmitting driving force from the driving motor to the compression unit;
A balance weight provided on the rotor or the rotary shaft; And
And a flow guide installed between the driving motor and the compression unit to guide the refrigerant discharged from the discharge hole to an inter-insulator space provided in the stator,
Scroll compressor.
The method according to claim 1,
The flow guide
An annular bottom portion having a shape overlapped with the discharge hole provided on the upper surface of the compression portion,
An inner wall portion protruding from the inner side of the bottom portion toward the driving motor side,
An outer wall portion protruding from the outer side surface of the bottom portion toward the driving motor side,
And a through hole provided in the bottom portion to communicate with the discharge hole
Scroll compressor.
3. The method of claim 2,
The outer wall portion
The stator of claim 1,
Scroll compressor.
The method of claim 3,
The upper end of the inner wall portion
And the lower end of the inner plate of the insulator of the stator
Scroll compressor.
The method of claim 3,
And a sealing member between the outer wall portion and the outer sheath
Scroll compressor.
The method of claim 3,
The outer plate has a step,
The outer wall part is formed as a double wall corresponding to the step
Scroll compressor.
A casing having an internal space;
An insulator having an inner wall and an outer wall disposed above and below the iron core; and a stator including a coil wound around the iron core and the insulator, ;
A rotor rotatably installed in the stator;
A compression unit fixed to the inside of the casing and forming an oil return passage between the casing and the compression unit and having a discharge hole for discharging the compressed refrigerant into the internal space of the casing;
A rotating shaft for transmitting a driving force from the rotor to the compression unit;
A balance weight provided on the rotor or the rotary shaft; And
And a flow guide installed between the driving motor and the compression unit and guiding the refrigerant discharged from the discharge hole into a space between the inner wall of the insulator and the outer wall
Scroll compressor.
8. The method of claim 7,
The flow guide
An annular bottom portion having a shape overlapped with the discharge hole provided on the upper surface of the compression portion,
An inner wall portion protruding from the inner side of the bottom portion toward the driving motor side,
An outer wall portion protruding from the outer side surface of the bottom portion toward the driving motor side,
And a through hole provided in the bottom portion to communicate with the discharge hole
Scroll compressor.
9. The method of claim 8,
The outer wall portion
The insulator shell plate
Scroll compressor.
10. The method of claim 9,
The upper end of the inner wall portion
And the lower end of the inner plate of the insulator
Scroll compressor.
10. The method of claim 9,
And a sealing member between the outer wall portion and the outer sheath
Scroll compressor.
10. The method of claim 9,
The outer plate has a step,
The outer wall part is formed as a double wall corresponding to the step
Scroll compressor.

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