JPH05164069A - Closed type scroll compressor - Google Patents

Abstract

PURPOSE:To cool effectively a driving electric motor, by separating lubricating oil contained in compressed refrigerant gas, and carrying out excellently a returning operation of the lubricating oil into an oil reservoir, in a high pressure chamber type closed scrool compressor. CONSTITUTION:A guide passage 21 is formed of a groove arranged in the outer peripheral part of a frame, a guide plate 19 arranged between a compression mechanism part and a driving electric motor part, a cut part 20 arranged in the outer peripheral part of the driving electric motor part and an inner wall of a closed container, and an upper space 16 and a lower space 22 are communicated with each other by means of the guide passage 21, and the guide passage 21 and a middle space 23 are cut off from each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a hermetic scroll compressor, particularly for reducing oil spillage.

[0002]

2. Description of the Related Art A hermetic scroll compressor is disclosed in JP-A-63-21.
As disclosed in Japanese Patent No. 2796, a mixed gas of a refrigerant gas and a lubricating oil compressed by a scroll compression mechanism section is discharged into an upper space above the compression mechanism section from a discharge hole provided in an upper portion of a fixed scroll, By colliding with the inner wall of the closed container, the refrigerant gas and the lubricating oil are separated. A plurality of passages having different passage resistances are provided on the outer periphery of the frame. Since the lubricating oil has a high viscosity, it passes through a passage having a small passage resistance. On the other hand, the refrigerant gas has a low viscosity and thus passes through a passage having a large passage resistance. In this way, the refrigerant gas and the lubricating oil respectively flow into the middle space between the compression mechanism portion and the drive motor portion. The refrigerant gas passes through the cut portion provided on the outer periphery of the drive motor and flows into the lower space below the drive motor,
The driving electric motor is cooled, and then again flows into the middle space through the cut portion on the outer periphery of the driving electric motor. On the other hand, the lubricating oil flows into the oil sump from the middle space through the cut portion on the outer periphery of the driving electric motor.

[0003]

In the above prior art, since the refrigerant gas flowing from the lower space into the middle space blows up the lubricating oil flowing from the upper space into the middle space, the refrigerant gas and the lubricating oil are mixed. Since the oil flows out of the closed container, the oil rise increases.

In order to prevent the lubricating oil from blowing up due to the refrigerant gas, the cross-sectional area of the passages on the outer circumference of the frame or the number of passages is changed to reduce the speed of the refrigerant gas flowing in the lower space to reduce the blowing up of the lubricating oil. However, since the flow rate of the refrigerant gas flowing through the lower space is reduced by doing so, the cooling effect of the drive motor is reduced.

As described above, in the prior art, there is a contradictory problem between the reduction of oil level and the cooling of the drive motor.

An object of the present invention is to solve the contradictory problems of reducing oil rising and cooling the driving motor.

[0007]

[Means for Solving the Problems] In order to reduce oil spillage and enhance the cooling effect of a driving electric motor, a scroll compression mechanism portion is connected to an upper portion and a driving electric motor portion is connected to a lower portion in a closed container. An oil reservoir is formed at the bottom of the closed container, and the frame supporting the compression mechanism and the driving electric motor are brought into close contact with the inner wall of the closed container so that the space inside the closed container is an upper space above the compression mechanism and a compression mechanism. In a high-pressure chamber type scroll compressor divided into three parts, a middle space between the drive motor and the drive motor, and a lower space below the drive motor, a groove provided on the outer periphery of the frame, the compression mechanism portion and the drive motor. A guide plate is provided between the parts, a cut part provided on the outer periphery of the drive motor part, and an inner wall of the closed container to form a guide passage, and the guide passage connects the upper space and the lower space. It is, is obtained by disconnecting the said guide passage the central space.

[0008]

The refrigerant gas sucked from the suction pipe is compressed by the orbiting action of the fixed scroll and the orbiting scroll, and is discharged from the discharge hole to the upper space while being mixed with the refrigerant gas. The mixed gas of the refrigerant gas and the oil flows from the upper space above the compression mechanism portion into the lower space below the drive motor through the guide passage. Since the lower space has a larger cross-sectional area than the guide passage, the velocity of the mixed gas becomes slow. When the speed of the mixed gas becomes slow, the lubricating oil contained in the mixed gas is separated by its own weight and drops into the oil sump. On the other hand, the refrigerant gas cools the driving electric motor and flows through the cut portion of the driving electric motor and the gap between the rotor and the stator of the driving electric motor to the middle space between the compression mechanism portion and the driving electric motor portion. The refrigerant gas flowing into the central space flows out of the closed container through the discharge pipe.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a sectional view showing the overall structure of a hermetic scroll compressor embodying the present invention.

In FIG. 1, a compression mechanism portion 2 is arranged in the upper part of the closed container 1, a driving electric motor 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. Has been done. The compression mechanism unit 2 has a configuration in which a fixed scroll 5 having a spiral wrap on a base plate and a wrap of an orbiting scroll 6 having a spiral wrap on the base plate are combined. Fixed scroll 5
A discharge hole 15 for discharging the compressed refrigerant gas is provided at the center of the. An Oldham ring mechanism 8 that prevents the orbiting scroll 6 from rotating is provided between the orbiting scroll 6 and the frame 7. The driving electric motor 3 is press-fitted into the closed container 1 and fastened to rotate the orbiting scroll 6 through a crankshaft 9. Crankshaft 9
Is supported by a main bearing 10 and a lower bearing 11 provided on the frame 7, and its crank pin is fitted with an orbiting bearing 12 provided on the back surface of the orbiting scroll 6.

An oil supply passage 13 for guiding lubricating oil to the main bearing 10, the lower bearing 11 and the orbiting bearing 12 is provided in the crankshaft 9, and the lubricating oil in the oil sump 4 is sucked up at the shaft end of the crankshaft 9. An oil supply device 14 is provided for feeding the oil into the oil supply passage 13.

On the back surface of the orbiting scroll 6, an intermediate pressure chamber 17 for guiding the gas during the compression stroke is formed. The pressure of the intermediate pressure 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 portion of the scroll is performed by utilizing the differential pressure between the discharge pressure and the intermediate pressure.

Axial direction (vertical direction) on the outer peripheral portion of the frame 7.
Is provided with a frame groove 18, and a guide plate 19 is provided between the compression mechanism portion 2 and the driving electric motor 3.
A cut portion 20 is provided on the outer peripheral portion of the frame groove 1
A guide passage 21 is formed by 8, the guide plate 19, the drive motor cut portion 20, and the inner wall of the closed container. The guide passage 21 connects the upper space 16 above the compression mechanism portion 2 and the lower space 22 below the drive motor 3 to each other, and the middle space 23 between the compression mechanism portion 2 and the drive motor 3 and the guide passage 21. Has been cut off.

In FIG. 1, reference numeral 24 is a suction pipe that penetrates the closed container 1 and guides a refrigerant gas from the outside of the closed container 1 to the suction side of the compression mechanism 2. Reference numeral 25 denotes a discharge pipe connected to a space between the compressor section in the closed container 1 and the driving electric motor 3, and the refrigerant gas compressed from the discharge pipe 25 flows out of the closed container 1.

Next, the operation will be described. When the orbiting scroll 6 orbits through the crankshaft 9 by the drive motor 3, the refrigerant gas sucked from the suction pipe 24 is compressed by the orbiting action of the fixed scroll 5 and the orbiting scroll 6. On the other hand, the lubricating oil passes through the oil supply passage 13 from the oil supply device 14, and the main bearing 10, the lower bearing 11, and the slewing bearing 12
Is lubricated, then flows into the compression chamber via the intermediate pressure chamber 17, and is discharged from the discharge hole 15 to the upper space 16 in a state of being mixed with the refrigerant gas. The mixed gas of the discharged refrigerant gas and oil flows into the lower space 22 from the upper space 16 through the guide passage 21. Since the lower space 22 has a larger cross-sectional area than the guide passage 21, the velocity of the mixed gas becomes slow. When the speed of the mixed gas becomes slow, the lubricating oil contained in the mixed gas is separated by its own weight and falls into the oil sump 4. On the other hand, the refrigerant gas cools the driving electric motor 3, and the cutting portion 2 of the driving electric motor 3
0 and flows through the gap between the rotor and the stator of the drive motor 3 into the middle space 23. The refrigerant gas flowing into the middle space 23 flows out of the closed container 1 through the discharge pipe 25.

Since the lubricating oil is separated from the mixed gas of the refrigerant gas and the lubricating oil in this way, the mixed gas in the upper space 16 containing a large amount of lubricating oil directly flows out of the closed container through the discharge pipe 25. Instead, the lubricating oil is separated in the lower space 22 and then flows out of the closed container 1 through the middle space 23. Therefore, it is possible to provide a compressor in which oil does not rise.

Further, all the refrigerant gas is contained in the lower space 22.
Therefore, the cooling effect of the drive motor 3 is very high.

As described above, according to the present technology, it is possible to solve the phenomena of separating the lubricating oil and cooling the driving motor 3 which are contradictory problems in the conventional technology.

Next, another embodiment will be described with reference to FIGS. FIG. 2 shows a partial cross-sectional view of a hermetic scroll compressor embodying the present invention, and FIG. 3 shows a view taken along the line II in FIG. In the present embodiment, the cut portion 20 provided on the outer peripheral portion of the driving electric motor 3 in the example of FIG. Similar to the example of FIG. 1, the cut portion 20 has a structure that forms a guide passage 21 together with the frame groove 18, the guide plate 19 and the inner wall of the closed container. Similar to the example of FIG. 1, the mixed gas of the refrigerant gas and the oil discharged into the upper space 16 flows into the lower space 22 from the upper space 16 through the guide passage 21, and the lubricating oil contained in the mixed gas in the lower space 22. Are separated by their own weight and fall into the oil sump 4. On the other hand, the refrigerant gas cools the drive motor 3 and flows into the middle space 23 through the gap between the rotor and the stator of the drive motor 3. The refrigerant gas flowing into the middle space 23 is discharged from the discharge pipe 25 into the closed container 1.
Spills out of. As described above, all the refrigerant gas passes through the gap between the rotor and the stator of the drive motor 3 and the intermediate space 23.
Therefore, the high-speed mixed gas flowing from the upper space 16 through the guide passage 21 into the lower space 22 does not separate the lubricating oil, and the cut portion 20 facing the cut portion 20 forming the guide passage 21. Further, since the phenomenon of flowing into the middle space 23 and flowing out of the closed container 1 through the discharge pipe 25 does not occur, oil rise can be reduced. Further, since all the refrigerant gas flows into the middle space 23 through the gap between the rotor and the stator of the driving electric motor 3, the cooling effect of the driving electric motor 3 becomes very high.

It should be noted that, as shown in FIG. 4, among the plurality of cut portions 20, the cut portions 20b other than the cut portion 20a forming the guide passage 21 are provided with the shielding plates 26 so that a plurality of generally used plurality of cut portions are provided. The driving electric motor 3 having the cut portion 20 can also provide the same effects as those in the examples of FIGS. 2 and 3.

Next, another embodiment will be described. 5 is a bottom sectional view of a hermetic scroll compressor embodying the present invention, and FIG. 6 is a view taken along the line II-II in FIG. The present embodiment has a structure in which fins 27 are provided below the rotor of the drive motor 3 in addition to the example of FIG. Similar to the example of FIG. 1, the mixed gas of the refrigerant gas and the oil discharged into the upper space 16 flows into the lower space 22 from the upper space 16 through the guide passage 21. The mixed gas flowing into the lower space 22 is fed to the fins provided under the rotor of the driving motor 3 by 27
Lubricating oil that causes more rotational motion and has a large mass adheres to the coil portion of the driving electric motor 3 stator and the inner wall of the closed container due to centrifugal force. The lubricating oil adhering to the coil drips into the oil sump 4 due to its own weight, and the lubricating oil adhering to the inner wall of the closed container travels along the inner wall of the closed container and flows into the oil sump 4. On the other hand, the refrigerant gas cools the driving electric motor 3 similarly to the example of FIG. 1, flows through the cut portion 20 of the driving electric motor 3 and the gap between the rotor and the stator of the driving electric motor 3 into the middle space 23, and the discharge pipe From 25, it flows out of the closed container 1. In this way, it is possible to provide a compressor with less oil spillage.

[0022]

According to the present invention, in a high pressure chamber type hermetic scroll compressor, the action of separating lubricating oil contained in the compressed refrigerant gas and returning it to the oil sump can be favorably performed. The drive motor can be cooled effectively.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the entire structure of a hermetic scroll compressor.

FIG. 2 is a partial cross-sectional view of a scroll compressor.

FIG. 3 is a view on arrow I-I in FIG.

FIG. 4 is a partial cross-sectional view of a scroll compressor.

FIG. 5 is a partial cross-sectional view of a scroll compressor.

6 is a view on arrow II-II in FIG.

[Explanation of symbols]

16 ... Upper space, 19 ... Guide plate, 20 ... Cut part, 21
... guide passage, 22 ... lower space, 23 ... middle space.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mutsunori Matsunaga 390 Muramatsu, Shimizu City, Shizuoka Prefecture Hitachi Ltd. Shimizu Plant

Claims (1)

[Claims] 1. A hermetically-sealed container in which a compression mechanism part is connected to an upper part and a driving electric motor part is continuously connected to a lower part, and an oil sump is formed at a bottom part of the hermetically-sealed container to support the compression mechanism part. By closely contacting the frame and the driving electric motor to the inner wall of the hermetic container, the space inside the hermetic container is an upper space above the compression mechanism section, and a middle space between the compression mechanism section and the driving electric motor. A scroll compressor of a high-pressure chamber type divided into three lower spaces below the drive motor, between the groove provided on the outer peripheral portion of the frame, the compression mechanism portion and the drive motor portion. A guide passage is formed by the guide plate provided, the cut portion provided on the outer peripheral portion of the driving electric motor portion, and the inner wall of the closed container.
A hermetic scroll compressor characterized in that the guide passage communicates the upper space and the lower space, and the guide passage and the middle space are cut off from each other.