JP2003193986A - Hermetic scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the amount of oil rise outside a closed vessel of a hermetic scroll compressor. <P>SOLUTION: In the hermetic scroll compressor, a compression mechanism part 2 composed of a fixed scroll 5, swivel scroll 6 and the like are disposed on the upper part in a cylindrical closed vessel 1, an electric motor part 3 driving the compression mechanism and an oil reservoir 4 are disposed on the lower and bottom part respectively in the cylindrical closed vessel 1, a crank part of driving shaft 9 is connected to the swivel scroll 6, an intermediate part is held by a frame 7, and the lower end part lower than the electric motor part 3 is supported by a lower cover 22 integrally formed with the frame 7. Coolant gas containing lubricating oil is delivered from the compression mechanism 2 and passes through the electric motor part 3, and then, collides with the bottom part of the lower cover 22 to separate gas and oil and drops the oil from an oil passage 21 formed on the lower cover 22 to the oil reservoir 4. And then, the gas collides with the inner wall of the closed vessel 1 from a gas passage hole 20 to separate oil. Thus, lubricating oil going out of the compressor accompanying the delivered coolant gas, so-called oil rise, can be reduced. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic scroll compressor, and more particularly to a technique for reducing so-called oil rising, in which lubricating oil goes out of the compressor in association with discharged refrigerant gas.

[0002]

2. Description of the Related Art As a conventional technique of this type, Japanese Patent Laid-Open No. 8-2
There is an example described in Japanese Patent No. 8464. In this example, the gas discharged from the compression mechanism passes through the electric motor, then flows toward the inner wall of the closed container, and then the passage system of the gas flowing from the discharge port provided in the closed container to the outside of the compressor is provided. Have been described.

In this example, after the discharged gas passes through the electric motor and collides with the inner wall of the closed container, the refrigerant gas and the lubricating oil are separated from each other, and the electric motor is effectively cooled. ing.

[0004]

However, in the above-mentioned prior art, after the gas discharged from the compression mechanism passes through the electric motor, the gas is made to collide with the inner wall of the closed container from the gas passage hole provided on the side surface of the lower cover. Since the lubricating oil is returned to the oil sump after the refrigerant gas and the lubricating oil are separated from each other, the path for returning the lubricating oil to the oil sump is only the gas passage hole provided on the side surface of the lower cover.

Therefore, when the discharged gas passes through the electric motor and then moves toward the gas passage hole, the traveling direction is almost 90 degrees.
The refrigerant gas and the lubricating oil are separated at different times, but by returning the separated lubricating oil to the oil sump, it becomes possible to further efficiently separate the lubricating oil.

An object of the present invention is to reduce the so-called oil rising by efficiently separating the lubricating oil mixed in the refrigerant gas discharged from the compression mechanism portion from the refrigerant gas and returning it to the oil sump. To provide a compressor.

[0007]

In order to achieve the above object, the present invention has a compression mechanism portion composed of a fixed scroll and an orbiting scroll in a closed container, and is partitioned by a frame and a lower cover in the closed container. An electric motor unit for driving the compression mechanism unit is installed in the inside, and an oil reservoir for lubricating oil to be supplied to the compression mechanism unit is provided at a position separated from the electric motor unit by the lower cover. After the discharged refrigerant gas passes through the partitioned electric motor part, it is jetted out of the partition through the gas passage hole on the side surface of the lower cover, and passes through the flow path along the inner wall of the hermetically sealed container to seal the hermetically sealed container. In a hermetic scroll compressor having a gas passage system flowing out from a discharge pipe attached to a container,
An oil passage is formed at the bottom of the lower cover where the refrigerant gas that has passed through the electric motor unit collides, and which guides the lubricating oil separated from the refrigerant gas due to the collision to the oil sump.

According to the present invention, the refrigerant gas discharged from the compression mechanism portion passes through the compartment having the electric motor portion and collides with the bottom portion of the lower cover. By the collision, the lubricating oil mixed in the refrigerant gas and the refrigerant gas are separated, and the separated lubricating oil is stored in the oil sump from the oil passage. Therefore, it is possible to prevent the lubricating oil from being discharged to the outside of the compressor together with the refrigerant gas, and to prevent so-called oil rising.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An outline of an embodiment of the present invention is shown in FIG.
As shown in, in the hermetic scroll compressor having the compression mechanism section 2 including the fixed scroll 5 and the orbiting scroll 6, the lubricating oil E mixed in the refrigerant gas D discharged from the compression mechanism section 2 is In order to efficiently separate the refrigerant gas and return it to the oil sump 4, the lower cover 22 on which the refrigerant gas discharged containing the lubricating oil collides collides with the oil passage 2.
1 is formed (see FIG. 3).

According to this example, the refrigerant gas D colliding with the lower cover changes its course abruptly (approximately 90 degrees) because its specific gravity is light. However, the lubricating oil E, which has a larger specific gravity than the gas, is absorbed by the lower cover. It remains on the collision surface and falls from the oil passage 21 to the oil sump 4. Therefore, the lubricating oil E mixed in the refrigerant gas D can be separated, and so-called oil rising can be prevented.

The refrigerant gas E having collided with the lower cover 22 and changed its course is then ejected from the gas passage hole 20 and collides with the inner wall surface of the casing 1a of the hermetically sealed container 1, and here again, the refrigerant gas D and the lubricating oil E. Are separated from each other, the lubricating oil E having a large specific gravity falls into the oil sump 4, and the refrigerant gas having a small specific gravity is separated from the casing 1
A rises along the inner wall surface and is discharged from the discharge pipe 19 (see FIG. 3).

Further, according to the present invention, the casing 1a is
The oil separation mechanism 26 can be installed in the refrigerant gas collision portion on the inner wall surface to effectively separate the refrigerant gas and the lubricating oil (see FIG. 4). Further, by covering the oil sump 4 with the partition plate 27, the gas passage hole 20 or the oil passage 2
A part of the refrigerant gas ejected from No. 1 prevents the lubricating oil in the oil pool from scattering (see FIG. 6).

Furthermore, if two or more gas passage holes 20 for ejecting the refrigerant gas toward the inner wall surface of the casing are arranged, the ejected refrigerant gas passages are dispersed in the circumferential direction of the inner surface of the casing, and the cross-sectional area of the gas passage is formed. Is increased, the rising gas velocity can be reduced, and re-scattering of the lubricating oil can be suppressed (see FIG. 4).

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an overall structural view of a scroll compressor of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 shows a refrigerant gas after being discharged from a discharge port in the scroll compressor shown in FIG. It is a figure showing the flow of lubricating oil (henceforth also only oil).

In FIG. 1, a compression mechanism section 2 is arranged in the upper part of the closed container 1, an electric motor part 3 is arranged in the lower part thereof, and an oil sump 4 of lubricating oil is formed in the bottom part of the closed container 1. There is.

The compression mechanism section 2 includes an orbiting scroll 6 having a spiral wrap on a base plate, a fixed scroll 5 also having a spiral wrap on the base plate, a drive shaft 9 driven by an electric motor 3, and a fixed scroll 5. And a frame 7 supporting the orbiting scroll 6 and an Oldham mechanism 8 for preventing the orbiting scroll 6 from rotating, and the wraps of the fixed scroll 5 and the orbiting scroll 6 are meshed with each other.

The frame 7 is fixed by fastening the outer peripheral surfaces 7a and 7b to the inner wall of the closed container 1. Further, the frame 7 is partitioned into the upper space 16 and the lower space 13 by fastening the outer peripheral surface 7a and the closed container 1, and the gas passage 7c for communicating the discharge port 15 at the center of the wrap of the fixed scroll 5 and the upper side of the electric motor 3 with each other. Is formed. The outer peripheral surface 7b of the frame 7 is partially fastened to the inner wall of the closed container 1. The frame 7 has a cylindrical shape, and the lower space 13 and the space inside the frame 7 are blocked.

One end of the drive shaft 9 is supported by the orbiting bearing 12 provided on the orbiting scroll 6, and the other end is supported by a lower bearing 23 provided on the lower cover 22. An oil supply hole 9a is provided at the center of rotation of the drive shaft 9. One end of the oil supply hole 9a is opened to the end face of the slewing bearing 12, and the other end is opened to the end face of the lower bearing 23 provided on the lower cover 22. ing. Further, the bearing 11 has a radial oil supply hole 9b communicating with the oil supply hole 9a.

The electric motor section 3 includes a rotor 3a and a stator 3
b, the stator 3b is press-fitted and fixed to the frame 7,
The clockwise rotation is transmitted when viewed from above the rotor 3a,
The orbiting scroll 6 is caused to orbit through the drive shaft 9.

The lower cover 22 includes a lower bearing 23 that supports the drive shaft 9, an oil supply pipe 14 that guides lubricating oil from the oil sump 4, and the like, and is fastened to the frame 7 with bolts 18.
In this embodiment, the lower cover 22 has a gas passage hole 20 facing the inner wall of the closed container, an oil passage 21 for guiding the lubricating oil accumulated on the bottom surface of the lower cover 22 to the oil sump 4, and the like.
The oil passage 21 on the bottom surface of the cover has a smaller diameter than the gas passage hole 20 on the side surface.

The closed container 1 comprises a casing 1a for supporting the frame 7 and caps 1b, 1c on both sides. The casing 1a is provided with a discharge pipe 19, the cap 1b is provided with a suction connection port 24, and the cap 1c is provided with legs 25. There is. Also,
The discharge pipe 19 provided in the casing 1a is provided farther from the gas passage hole 20 provided in the side surface of the lower cover 22.

Next, the operation of the scroll compressor will be described. The compression chamber formed by the orbiting scroll 6 and the fixed scroll 5 decreases in volume as it moves toward the center of the scroll through the crank portion of the drive shaft 9 driven by the electric motor unit 3, and compresses the sucked refrigerant gas. To do.
The compressed refrigerant gas is discharged from the discharge port 15 provided at the center of the base plate of the fixed scroll 5 into the upper space 1 in the closed container 1.
6 is discharged.

On the back surface of the orbiting scroll 6, there is formed an intermediate chamber 17 into which the refrigerant gas during the compression process is introduced. The pressure of the intermediate chamber 17 is an intermediate pressure between the suction pressure and the discharge pressure of the refrigerant gas, and the oil supply to the sliding portions of both scrolls is performed by utilizing the differential pressure between the discharge pressure and the intermediate pressure.

The lubricating oil is the oil supply pipe 1 under discharge pressure.
4 to the lower bearing 23, and further guided to the main bearing 10, the bearing 11 and the orbiting bearing 12 through the oil supply passage 9a, and after lubricating them, they flow into the compression chamber through the intermediate chamber 17 under intermediate pressure. In the state of being mixed with the refrigerant gas, the gas is discharged from the discharge port 15 provided in the center of the fixed scroll 5 to the upper space 16 in the closed container 1.

All the discharged refrigerant and lubricating oil gases are
The gas passes through a gas passage 7c formed by the outer peripheral surface 7a of the frame and the inner wall of the closed container 1, is guided to the inside of the frame 7, and flows above the electric motor 3. Since the lower space 13 outside the cylindrical frame 7 and the space inside the frame are blocked by the frame 7, all the refrigerant gas and oil pass through the electric motor 3 to cool the electric motor 3 and then the electric motor 3. 3 is guided to the lower cover 22 below and collides with the bottom surface of the lower cover 22, and the gas changes its traveling direction by about 90 degrees.

At this time, the refrigerant gas and the lubricating oil are separated. The gas having a low specific gravity collides with the bottom surface of the lower cover 22 to change its traveling direction and flow toward the gas passage hole 20 provided on the side surface of the lower cover, while the lubricating oil having a high specific gravity remains on the bottom surface of the lower cover. The remaining lubricating oil is removed by the lower cover 22.
The oil passage 21 provided on the bottom surface of the lower cover 22 allows the oil to be efficiently separated by dropping it into the oil sump 4 located under the lower cover 22.

Thereafter, the gas collides with the inner wall of the closed container 1 through the gas passage hole 20 provided on the side surface of the lower cover 22,
Further, the lubricating oil is separated and then guided to the outside of the compressor from the discharge pipe 19 provided in the closed container 1. In FIG. 3, the flow of the refrigerant gas is shown by an arrow D, and the flow of oil is shown by an arrow E.

In this structure, the lubricating oil can be efficiently separated by two collisions, and all the refrigerant gas is guided to the lower cover 22 to separate the oil, so that the refrigerant gas before the oil separation is discharged from the discharge pipe 19. Since it is not discharged further to the outside and there is an oil pool near the separated lubricating oil, it is possible to quickly guide the oil to the oil pool, prevent oil from re-scattering, and prevent oil rising. Can be reduced.

Next, another embodiment of the present invention will be described with reference to FIGS. In the present embodiment, from the gas passage hole 20 provided on the side surface of the lower cover 22 of the hermetic scroll compressor shown in FIG. 1 to a portion where gas collides with the inner wall of the hermetic container,
The oil separation mechanism 26 is provided. FIG. 4 shows a view seen from below the lower cover 22. FIG. 5 is a front view and a C-C cross-sectional view of the oil separation mechanism 26 viewed from the gas passage hole 22 provided on the side surface of the lower cover.

The oil separating mechanism 26 of this embodiment is provided with the gas passage hole 20.
A plate 26a extending vertically with a required radial height on the inner wall surface of the closed container 1 where the gas collides with
To guide the gas colliding with the inner wall of the closed container in the circumferential direction,
Plates 26b, 26c that close one of the vertical direction and the circumferential direction
The gas can move only in the direction of the arrow B in the circumferential direction.

By means of this oil separation mechanism 26, the lower cover 2
The gas ejected from the gas passage hole 20 provided on the side surface of No. 2 collides with the inner wall of the closed container, changes the direction in the circumferential direction by the oil separation mechanism 26, and collides with the plate 26a extending in the axial direction, thereby generating the gas The lubricating oil is separated, and the separated oil is removed from the plate 2
It flows downward along 6a and is guided to the oil sump.

Next, still another embodiment of the present invention will be described with reference to FIG. FIG. 6 shows a vertical cross-sectional view of the entire structure of the hermetic scroll compressor of this embodiment. In this embodiment,
A partition plate 27 for partitioning the oil sump 4 of the hermetic scroll compressor shown in FIG. 1 and the lower cover 22 above the oil sump 4 is attached.

By attaching the partition plate 27, the gas blown out from the gas passage hole 20 provided on the side surface of the lower cover 22 collides with the closed container 1 and a part of the gas goes to the oil sump 4 to collect the oil sump. It is possible to prevent the oil inside from being re-scattered, and it is possible to reduce oil spillage.

Next, still another embodiment will be described with reference to FIG. In the present embodiment, the gas passage hole 20 provided on the side surface of the lower cover 22 of the hermetic scroll compressor shown in FIG.
Are arranged at least two or more. In FIG. 7, three gas passage holes 20a, 20b, 20c are illustrated.

In this case, two or more gas passage holes 20 are provided.
It is important to make the diameter smaller than the diameter of one gas passage hole. By changing the hole diameter, the gas velocity at which the plurality of gas passage holes 20 collide with the inner wall of the closed container is maintained at the same level as in the case where there is only one passage hole. If the ejection speed from the gas passage hole is low, it becomes difficult to efficiently separate the gas and the oil due to the collision.

By providing a plurality of gas passage holes 20 in this manner, the flow paths of the ejected refrigerant gas are dispersed in the circumferential direction of the inner surface of the casing, and the passage area (cross-sectional area) of the gas after collision is the passage hole 1 Since it becomes larger than the case of only one piece, the gas velocity after colliding with the inner wall of the casing of the closed container can be reduced, re-scattering of separated oil can be reduced, and oil rising can be reduced.

As described above, according to the embodiment of the present invention, the refrigerant gas discharged from the compression mechanism portion passes through the section having the electric motor portion and collides with the bottom portion of the lower cover, and the collision causes the refrigerant gas. The lubricating oil and the gas inside are separated, and the separated lubricating oil is stored in the oil reservoir through the oil passage. Further, the refrigerant gas ejected from the gas passage hole on the side surface of the lower cover collides with the inner wall surface of the closed container to separate the oil in the refrigerant gas again.

By installing an oil separation mechanism at the gas collision portion on the inner wall surface of the closed container, it is possible to effectively separate the lubricating oil in the refrigerant gas. Furthermore, by covering the oil sump with the partition plate, it is possible to prevent the lubricating oil in the oil sump from scattering due to the pressure of the refrigerant gas. Further, by providing a plurality of gas passage holes on the side surface of the lower cover in the circumferential direction, the flow passage area of the gas after collision with the inner wall of the closed container is increased,
The flow velocity of the refrigerant gas can be reduced and the re-scattering of the lubricating oil can be prevented.

[0039]

According to the present invention, in the hermetic scroll compressor, the lubricating oil mixed in the refrigerant gas discharged from the compression mechanism portion is efficiently separated from the refrigerant gas and returned to the oil sump. So-called oil rising can be effectively reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of the entire structure of a scroll compressor that is an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a diagram showing flows of a refrigerant gas and a lubricating oil in the embodiment shown in FIG.

FIG. 4 is a view of the lower cover as seen from below according to another embodiment of the present invention.

5 is a front view of the oil separation mechanism viewed from the gas passage hole and a cross-sectional view taken along the line C-C in the embodiment shown in FIG. 4.

FIG. 6 is a vertical cross-sectional view of the entire structure of a scroll compressor which is another embodiment of the present invention.

FIG. 7 is a view of the lower cover seen from below according to still another embodiment of the present invention.

[Explanation of symbols]

1 ... Airtight container 1a ... Casing 2 ... compression mechanism 3 ... Motor part 4 ... oil sump 5 ... Fixed scroll 6 ... orbiting scroll 7 ... frame 7a, 7b ... Frame outer peripheral surface 7c ... Gas passage 9 ... Drive shaft 11 ... Bearing 12 ... Slewing bearing 13 ... Lower space 16 ... Upper space 17 ... Intermediate room 19 ... Discharge pipe 20, 20a, 20b, 20c ... Gas passage hole 21 ... Oil passage 22 ... Lower cover 26 ... Oil separation mechanism 26a, 26b, 26c ... plate 27 ... Partition board Arrow B, arrow D ... Gas flow direction Arrow E ... Flow direction of lubricating oil after being discharged from the discharge port

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3H029 AA02 AA14 AB03 BB05 CC07                       CC25 CC44                 3H039 AA05 BB11 BB16 CC29 CC32

Claims (5)

[Claims] 1. A hermetically-sealed container has a compression mechanism section including a fixed scroll and an orbiting scroll, and an electric motor section for driving the compression-mechanism section is installed inside a frame and a lower cover in the hermetically-sealed vessel. An oil reservoir for lubricating oil to be supplied to the compression mechanism section is provided at a position separated from the electric motor section by the lower cover, and refrigerant gas discharged from the compression mechanism section passes through the partitioned electric motor section. After that, a gas passage system is sprayed from the gas passage hole on the side surface of the lower cover to the outside of the compartment, passes through a flow path along the inner wall of the closed container, and then flows out from a discharge pipe attached to the closed container. Type scroll compressor,
A hermetic scroll compression characterized in that an oil passage for guiding the lubricating oil separated from the refrigerant gas by the collision to the oil sump is formed at the bottom of the lower cover where the refrigerant gas passing through the electric motor section collides. Machine. 2. The scroll compressor according to claim 1, further comprising a partition plate for partitioning the oil sump and the lower cover. 3. The at least two gas passage holes on the side surface of the lower cover are installed.
The scroll compressor according to any one of the above. 4. An oil separating means for separating lubricating oil mixed in the refrigerant gas is provided on an inner wall portion of the closed container against which the refrigerant gas ejected from the gas passage hole on the side surface of the lower cover collides. The scroll compressor according to any one of Items 1 to 3. 5. The oil separating means comprises a guide member for guiding the path of the refrigerant gas and a collision member for colliding with the guided refrigerant gas. Scroll compressor.