JP2003003973A - Scroll compressor - Google Patents

Abstract

(57) [Summary] A lubricating oil is accurately separated from a refrigerant gas discharged into a discharge chamber and collected in a lubricating oil reservoir. An inclined surface is formed by inclining an upper portion of a fixed scroll, a lubricating oil recovery path communicating with a motor room is formed below the inclined surface, and a periphery of the inclined surface is formed. , A drip wall 5a is provided on the inner wall of the upper surface of the closed container 1, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly to a structure for smoothly collecting lubricating oil mixed with a refrigerant in a lubricating oil sump.

[0002]

2. Description of the Related Art A conventional scroll compressor is shown in FIG.
As shown in FIG. 2, the compression unit 2 and the electric motor 4 are arranged in the closed container 1, the discharge chamber 5 is provided above the compression unit 2, and the lubricating oil sump 10 is provided below the electric motor chamber 3 in which the electric motor 4 is arranged. Are provided respectively. The compression unit 2 is composed of a fixed scroll 7 in which a spiral wrap 7a is formed on an end plate, an orbiting scroll 8 in which a spiral wrap 8a is formed on the end plate so as to mesh with the wrap 7a, and a main frame 6. ,
A plurality of compression chambers are formed between the wraps 7a and 8a. A suction pipe 11 for introducing a refrigerant gas from the outside to the compression portion 2 and a discharge pipe 12 for discharging the compressed and high-pressure refrigerant gas to the outside are connected to the side surface of the closed container 1, respectively. , From the suction pipe 12 to the compression unit 2
The refrigerant gas introduced into the fixed scroll 7 is gradually compressed toward the center of the compression chamber formed by the mesh between the wrap 7a and the wrap 8a, and becomes a high pressure, and the discharge hole 7b is formed in the fixed scroll 7. Is discharged to the discharge chamber 5 via a gas passage 30 formed at the side ends of the fixed scroll 7 and the main frame 6, and is discharged to the outside from the discharge pipe 12. It has become so.

The lubricating oil stored in the lubricating oil reservoir 10 is a lubricating oil passage 9a formed in the main shaft 9 of the electric motor 4.
The bearing of the main frame 6 is supplied with oil from the tip of the crankshaft that supports the orbiting scroll 8 while rotating, and a part of the oil is supplied to the compression unit 2. The lubricating oil supplied to the bearing portion is dropped and collected in the lubricating oil sump 10, and the lubricating oil supplied to the compression portion 2 is mixed with the refrigerant gas, and the refrigerant gas passes through the gas passage 30. When it is guided to the electric motor chamber 3, it is separated and collected in the lubricating oil sump 10.

However, the lubricating oil is not sufficiently separated from the refrigerant gas because the lubricating oil is atomized and mixed with the refrigerant gas introduced into the electric motor chamber 3 through the gas passage 30. There is a risk that the oil may leak from the discharge pipe 12 to the outside, the amount of lubricating oil in the lubricating oil sump 10 may gradually decrease, and seizure may occur in the bearing portion of the main frame 6 due to insufficient oil supply.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, when the refrigerant gas mixed with the lubricating oil is discharged from the compression section to the discharge chamber, the present invention accurately discharges the lubricating oil from the refrigerant gas in the discharge chamber. An object of the present invention is to provide a scroll compressor that can be separated and smoothly collect the separated lubricating oil in a lubricating oil reservoir.

[0006]

According to the present invention, in order to solve the above problems, a compression section and an electric motor are arranged in a closed container, and a discharge chamber is arranged above the compression section and the electric motor is arranged. Lubricating oil reservoirs were provided below the electric motor chambers, and the compression section was formed on the end plate with a fixed scroll having a spiral wrap formed on the end plate and a wrap that meshes with the wrap to form a plurality of compression chambers. It is composed of an orbiting scroll and a main frame, and the main shaft of the electric motor is pivotally supported by a bearing portion of the main frame, and a crankshaft formed at a tip end is supported by a bearing portion on the lower surface of the orbiting scroll to perform an orbiting drive. The lubricating oil stored in the lubricating oil reservoir is supplied to the bearing portion of the main frame and the compression chamber via a lubricating oil passage formed in the main shaft, and to one side of the closed container. Connection The refrigerant gas is introduced into the compression section by the suction pipe and compressed by the compression chamber to generate high-pressure refrigerant gas, and the high-pressure refrigerant gas is supplied to the upper inner wall of the main frame and the upper surface of the fixed scroll. The discharge chamber formed by the above, and is guided to the electric motor chamber through a gas passage that is continuously formed in the fixed scroll and the main frame, and is discharged by a discharge pipe connected to one side of the closed container. On the other hand, in a scroll compressor in which the lubricating oil separated from the refrigerant gas is recovered in the lubricating oil sump, an oil-proof wall is erected on the outer periphery of the upper surface of the fixed scroll so as to be separated from the inner wall of the closed container. Along with
The inside surrounded by the oil-proof wall is formed into an inclined surface, and a lubricating oil recovery passage for communicating the discharge chamber and the electric motor chamber is formed at the bottom of the inclined surface.

Further, the lubricating oil recovery passage is formed at a portion separated from the gas passage.

Further, a drip wall is provided on the inner wall of the upper surface of the closed container for allowing the lubricating oil adhering to the inner wall of the upper container to drip on the inclined surface of the fixed scroll.

Further, the oil barrier is formed so as to be inclined inward.

Further, the bottom of the inclined surface is formed with an arcuate groove extending to both sides of the opening of the lubricating oil recovery passage.

A plurality of oil grooves are formed on the inclined surface, the oil grooves extending radially from the opening of the lubricating oil recovery passage, and the lubricating oil dropped on the inclined surface is guided to the lubricating oil recovery passage by the oil groove. It is composed.

Further, a lubricating oil recovery pipe is connected to the lower end of the lubricating oil recovery passage, passing through the stator of the electric motor and reaching the lubricating oil sump.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail as examples based on the accompanying drawings. FIG. 1 is a sectional view showing a scroll compressor according to the present invention, and FIG. 2 is a sectional view showing another embodiment. The scroll compressor according to the present invention, as shown in FIG.
A compression unit 2 and an electric motor 4 are provided, a discharge chamber 5 is provided above the compression unit 2, and a lubricating oil sump 10 is provided below an electric motor chamber 3 in which the electric motor 4 is provided. The compression unit 2 is
A fixed scroll 7 having a spiral wrap 7a formed on the end plate, a orbiting scroll 8 having a spiral wrap 8a formed on the end plate so as to mesh with the wrap 7a, and a main frame 6 are provided. And the above 8
A plurality of compression chambers are formed between a. The electric motor 4
Is composed of a rotor 4a, a stator 4b, and a main shaft 9 to which the rotor 4a is fixed. The main shaft 9 is rotatably supported by a bearing portion 6a of the main frame 6. The tip of the main shaft 9 has a crankshaft 9 that performs an eccentric rotary motion.
a is provided, and a bearing connected to the crankshaft 9 a is provided on the lower surface of the orbiting scroll 8.
The orbiting scroll 8 makes an eccentric orbiting motion as the wheel rotates.

On the side surface of the closed container 1, the compression portion 2 is provided.
A suction pipe 11 for introducing a refrigerant gas is connected to the suction pipe 11, and the refrigerant gas sucked from the suction pipe 11 and introduced into the compression section 2 causes the orbiting scroll 8 to orbit by the drive of the main shaft 9, and the wrap The compression chamber formed by 7a and the wrap 8a is gradually compressed to a high pressure as the compression chamber sequentially moves from the outer peripheral portion to the central portion, and the high-pressure refrigerant gas is discharged into the central portion of the fixed scroll 7 by discharge. The liquid is discharged from the hole 7b into the discharge chamber 5. A gas passage 14 that connects the discharge chamber 5 and the electric motor chamber 3 is provided at the side ends of the fixed scroll 7 and the main frame 6, and the gas is discharged into the discharge chamber 4 through the gas passage 14. The high-pressure refrigerant gas is guided to the electric motor chamber 3 and is discharged to the outside from the discharge pipe 12 connected to the side surface of the closed container 1.

The lubricating oil stored in the lubricating oil sump 10 passes through a lubricating oil passage 9b formed in the main shaft 9, and the main frame pivotally supports the main shaft 9 from the tip of the crank shaft 9a. The bearing portion 6a of 6 and the compression chamber of the compression portion 2 are supplied with oil, respectively.

On the outer periphery of the upper surface of the fixed scroll 7, as shown in FIG. 1, an oil-proof wall 7d is erected so as to be separated from the inner wall of the closed container 1 and surrounded by the oil-proof wall 7d. An inclined surface 7c is formed at an upper portion of the fixed scroll 7, and a lubricating oil recovery passage 13 that is separated from the gas passage 14 and communicates with the electric motor chamber 4 is formed at a bottom portion of the inclined scroll 7c. There is. In addition, on the inner wall of the upper surface of the closed container 1,
A drip wall 5a is hung so as to face the oil-proof wall 7d and be arranged inside the oil-proof wall 7d.

Next, the operation of the above scroll compressor will be described. The refrigerant gas introduced from the suction pipe 11 to the compression unit 2 is compressed by the compression chamber, mixed with the lubricating oil supplied from the lubricating oil sump 10, and discharged from the fixed scroll 7. It is discharged into the discharge chamber 5 through the hole 7b. The mist-like lubricating oil mixed with the refrigerant gas adheres to the inner wall of the upper surface of the closed container 1 in a granular form, and the granular lubricating oil is transmitted through the drip wall 5 a hanging from the closed container 1 and fixed. It is adapted to drip onto the inclined surface 7c formed on the upper portion of the scroll 7. The lubricating oil dropped on the inclined surface 7c is the oil barrier 7d.
Surrounding by, it flows down the inclined surface 7c without being scattered around, flows into the lubricating oil recovery passage 13, and is collected in the lubricating oil sump 10 via the electric motor chamber 3. Further, the refrigerant gas from which the lubricating oil has been separated is sent to the electric motor chamber 3 through the gas passage 14 and led out to the outside by the discharge pipe 12.

The gas passage 14 for delivering the refrigerant gas to the electric motor chamber 3 and the lubricating oil recovery passage 1 for recovering the lubricating oil.
3 is provided separately, while the upper portion of the fixed scroll 7 onto which lubricating oil drips is the inclined surface 7c,
The lubricating oil can be smoothly collected in the lubricating oil sump 10.

Next, another embodiment will be described. Figure 2
In the example shown in, the oil-proof wall 15 is erected on the outer periphery of the upper surface of the fixed scroll 15 so as to incline inward, and the flow of the refrigerant gas discharged from the discharge hole 7b is agitated so that the refrigerant gas It is designed to promote separation from lubricating oil.
Further, a lubricating oil recovery pipe 16 penetrating the stator 4b of the electric motor 4 and reaching the lubricating oil sump 10 is connected to the lower end of the lubricating oil recovery passage 13 so that the lubricating oil can be recovered more smoothly. There is.

Further, in the example shown in FIG. 3 (A), arc-shaped grooves 17 are formed on both sides of the opening of the lubricating oil recovery passage 13 opened on the upper surface of the fixed scroll so that the lubricating oil flowing down the inclined surface 7c can be prevented. The arcuate groove 17 is smoothly guided to the opening of the lubricating oil recovery passage 13. Further, in the example shown in FIG. 3B, a plurality of oil grooves 18 that radially spread from the opening of the lubricating oil recovery passage 13 are formed on the inclined surface 7c, and the lubricating oil dropped on the inclined surface 7c is The oil groove 18 guides smoothly to the lubricating oil recovery passage 13.

[0021]

As described above, according to the present invention,
An oil-proof wall is erected on the upper surface of the fixed scroll so as to be separated from the inner wall of the closed container, and the inside of the oil-proof wall is formed into an inclined surface. By piercing, the scroll compressor can smoothly collect the lubricating oil in the lubricating oil reservoir.

[Brief description of drawings]

FIG. 1 is a sectional view showing a scroll compressor according to the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the scroll compressor according to the present invention.

FIG. 3A is a top view in which arc-shaped grooves are formed on both sides of a lubricating oil recovery passage according to another embodiment. (B) is a top view of a radial oil groove formed on an inclined surface according to another embodiment.

FIG. 4 is a cross-sectional view showing a scroll compressor according to a conventional example.

[Explanation of symbols]

1 closed container 2 Compressor 3 electric motor room 4 electric motor 4a rotor 4b stator 5 discharge chamber 5a drip wall 6 main frames 6a Bearing part 7 fixed scroll 7a wrap 7b Discharge hole 7c slope 7d oil barrier 8 orbiting scroll 8a wrap 9 spindle 9a crankshaft 9b Lubricating oil passage 10 Lubricant oil sump 11 Suction tube 12 Discharge pipe 13 Lubricating oil recovery path 14 gas passage 15 Fixed scroll 15b oil barrier 16 Lubricant recovery pipe 17 Arc-shaped groove 18 oil ditch

Claims (7)

[Claims] 1. A compression unit and an electric motor are provided in a closed container, a discharge chamber is provided above the compression unit, and a lubricating oil sump is provided below the electric motor chamber in which the electric motor is arranged. The part is composed of a fixed scroll in which a spiral wrap is formed on an end plate, a revolving scroll in which wraps that mesh with the wrap to form a plurality of compression chambers are formed on the end plate, and a main frame, and the electric motor Of the main shaft is rotatably supported by the bearing portion of the main frame, and the crankshaft formed at the tip end is rotatably driven by being supported by the bearing portion of the lower surface of the orbiting scroll, and the lubricating oil stored in the lubricating oil reservoir is While supplying oil to the bearing portion of the main frame and the compression chamber through a lubricating oil passage formed in the main shaft, a refrigerant gas is introduced into the compression portion by a suction pipe connected to one side of the closed container. Before The high-pressure refrigerant gas is compressed by the compression chamber, and the high-pressure refrigerant gas is guided to the discharge chamber formed by the upper inner wall of the main frame and the upper surface of the fixed scroll, and the fixed It is guided to the electric motor chamber through a gas passage that is continuously formed in the scroll and the main frame, and is led to the outside by a discharge pipe connected to one side of the closed container, while the lubricating oil separated from the refrigerant gas is In a scroll compressor collected in a lubricating oil sump, an oil prevention wall is erected on the outer periphery of the upper surface of the fixed scroll so as to be separated from the inner wall of the closed container, and the inside surrounded by the oil prevention wall is inclined. A scroll compressor, which is formed on a surface and has a lubricating oil recovery passage which is provided at a bottom portion of the inclined surface and connects the discharge chamber and the electric motor chamber. 2. The lubricating oil recovery passageway is formed at a site separated from the gas passageway.
Scroll compressor described in. 3. A drip wall for hanging down the lubricating oil adhering to the inner wall of the upper surface of the closed container on the inclined surface of the fixed scroll is hung down on the inner wall of the upper surface of the closed container.
Scroll compressor described in. 4. The scroll compressor according to claim 3, wherein the oil-proof wall is formed so as to be inclined inward. 5. The scroll compressor according to claim 1, wherein an arcuate groove is formed on the bottom of the inclined surface, the arc-shaped groove extending to both sides of the opening of the lubricating oil recovery passage. 6. A plurality of oil grooves radially extending from the opening of the lubricating oil recovery passage are formed on the inclined surface, and the lubricating oil dropped on the inclined surface is guided to the lubricating oil recovery passage by the oil groove. The scroll compressor according to claim 1, characterized in that. 7. The scroll compression system according to claim 1, wherein a lower end of the lubricating oil recovery passage is connected to a lubricating oil recovery pipe that penetrates the stator of the electric motor and reaches the lubricating oil sump. Machine.