JP2001271749A - Closed electrically driven compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device having high reliability and performance coefficient by reducing the rate of lubricating oil mixed in high pressure refrigerant gas delivered to an outside of a closed container. SOLUTION: An oil delivery passage 32 is disposed in a rotor 15 of motor part 16, and oil supplied for lubricating a compression mechanisms part 1 and a crankshaft 12 is delivered from the oil delivery passage 32 downward the motor part 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner mainly used for refrigeration and air conditioning for business use or home use, or a vertical type hermetic electric compressor such as a scroll compressor or a rotary compressor used for a refrigerator or the like. It is about the machine.

[0002]

2. Description of the Related Art Conventionally, as a vertical hermetic electric compressor such as a scroll compressor or a rotary compressor of this type,
For example, Japanese Patent Application Laid-Open No. 7-189963 is known.

As shown in FIG. 2, in this conventional vertical hermetic electric compressor, a compression mechanism 1 and a rotor 15 and a stator 14 constituting an electric motor 16 are provided inside a hermetic container 10.
A crankshaft 12 for transmitting the rotational force of the electric motor unit 16 to the compression mechanism unit 1 and a bearing member 9 for supporting the crankshaft 12 are installed, and the bearing member 9 temporarily collects oil used for lubrication of the bearing unit. An oil recovery container 27 is provided. Also,
The closed vessel 10 is provided with a suction pipe 18 for sucking the low-pressure refrigerant gas and a discharge pipe 23 for discharging the high-pressure refrigerant gas compressed by the compression mechanism 1 to the outside of the closed vessel.

In the above configuration, when the rotor 15 of the motor 16 rotates, the torque is transmitted to the compression mechanism 1 by the crankshaft 12. When the rotational force is transmitted to the compression mechanism 1, a compression action is generated in the refrigerant gas. As a result, after being discharged from the suction pipe 18 into the discharge port side space 29 of the internal space of the sealed container 10, it passes through the communication port 21 provided in the bearing member 9, and the electric motor section 16 is provided. To the motor part space side 30, and then the motor part 16 and the communication port 22 of the bearing member 9 from the lower part of the closed casing 10.
Is discharged from a discharge pipe 23 provided on the top surface of the closed container 10 to a refrigeration cycle (not shown).

[0005] On the other hand, a lubricating oil reservoir 25 is provided at a lower portion that forms the bottom of the sealed container 10.
The lubricating oil stored in the pump port 24 is pumped up by a lubrication pump 24 and the like, and after lubricating a sliding surface with the crankshaft 12, a part thereof is discharged from the compression mechanism 1 together with the high-pressure refrigerant gas into the discharge port side space 29. And the rest is temporarily collected in an oil collection container 27 arranged in the bearing member 9.

[0006] The oil stored in the oil recovery container 27 is pressed against the inner surface of the peripheral wall of the oil recovery container 27 by centrifugal force generated by the rotation of the balance waist 37 integrally attached to the crankshaft 12. The centrifugal force is applied to the bearing member 9 through the communication port 28 of the small chamber 38 formed in the oil recovery container 27, and after the small chamber 38 is raised, the oil is discharged from the oil discharge passage 34 to the bearing member 9. When the high-pressure refrigerant gas flows down from the communication port 21 provided, the high-pressure refrigerant gas is turned downward and reaches the motor unit space side 30, and the collision between the motor unit space side 30 and the communication port 22 of the bearing member 9 causes a high pressure. After being separated from the refrigerant gas, the lubricant gas is dropped by the action of gravity and the lubricating oil reservoir 25 at the lower part of the closed container 10 is removed.
Is returned to.

[0007]

However, in such a conventional hermetic electric compressor, during operation, the speed of the high-pressure refrigerant gas flowing down from the communication port 21 is high, and the pressure of the refrigerant oil discharge passage 34 into the closed container 10 is reduced. The oil released to the compressor is easily atomized and scatters due to the flow of the high-pressure refrigerant gas that rises due to the rotating centrifugal force and the wind pressure generated by the rotor 15 of the electric motor unit 16, and becomes a droplet of the lubricating oil. After wrapping around the motor unit space side 30, the outflow path is extended above the compression mechanism 1 at the collision separation point to separate it from the high-pressure refrigerant gas. Is discharged to a refrigeration cycle (not shown) through the discharge pipe 23 together with the refrigerant gas containing

On the other hand, a part of the oil collected in the oil recovery container 27 leaks out of a gap 39 formed between the oil recovery container 27 and the crankshaft 12, and the lubricating oil leaking below this part is Is exposed to the rotor 15 of the electric motor unit 16 and is agitated by the rotor 15 to be scattered as oil droplets in the lower space of the compression mechanism unit 1 to become oil droplets, and to rise to the rising compressed refrigerant gas. Discharge pipe 2 without multiplying and separating
3 through the refrigeration cycle (not shown).

For this reason, the lubricating oil contained in the high-pressure refrigerant gas discharged from the sealed container 10 causes a decrease in heat exchange efficiency in a heat exchanger such as a condenser or an evaporator in a refrigeration cycle, Since the reliability and the coefficient of performance of the compressor are reduced, the required level for reducing the discharge amount of the lubricating oil is increased, and there is a problem that conventional technology cannot cope with the increase.

In order to solve the above problems, the present invention reduces the proportion of lubricating oil mixed in high-pressure refrigerant gas discharged to the outside of a closed vessel, thereby reducing piping pressure loss in a refrigerant cycle, a condenser and an evaporator. It is an object of the present invention to provide a heat exchanger having a high reliability and a high coefficient of performance without causing a decrease in heat exchange efficiency in a heat exchanger.

[0011]

In order to achieve the above object, in a hermetic electric compressor according to the present invention, a compression mechanism and a compression mechanism provided below the compression mechanism are driven in a closed container. And a crankshaft for transmitting the rotational force of the motor unit to the compression mechanism. The lubricating oil in a lubricating oil reservoir provided in the lower part of the closed container is supplied to the bearing of the crankshaft through the crankshaft. After returning to the lubricating oil reservoir after being supplied to the compressor and the compression mechanism, the high-pressure refrigerant gas discharged from the compression mechanism is passed from above to below the electric motor section, and then is supplied to the outside through above from below. In a hermetic electric compressor, an oil recovery passage is provided above a rotor of a motor portion, and oil used for lubrication of a bearing portion of a crankshaft and a compression mechanism portion discharged from the oil recovery passage is supplied to the motor portion. Provided on the rotor It is characterized in that from the discharge passage to discharge below the motor section.

In such a configuration, the oil used for lubricating the compression mechanism and the crankshaft is directly returned to the lubricating oil reservoir at a position below the motor, which is not affected by the stirring effect of the rotor of the motor. Is prevented from scattering of oil from the wind pressure generated by the rotor of the electric motor, which multiplies the high-pressure refrigerant gas that rises by the rotating centrifugal force, and the ratio of lubricating oil mixed into the high-pressure refrigerant gas discharged to the outside of the closed container Thus, it is possible to prevent pipe pressure loss in the refrigeration cycle and decrease in heat exchange efficiency in a heat exchanger such as a condenser or an evaporator.

[0013] In the hermetic electric compressor, the oil recovery passage may include an oil recovery container and a crankshaft which form a cover extending near an upper end of an outer rotor in a bearing portion of a compression mechanism supporting the crankshaft. Formed between
An upper opening of an oil discharge passage provided in the rotor is positioned within a range facing an annular gap formed between a lower portion of the oil recovery container and a crankshaft.

In this configuration, the oil recovery passage formed between the crankshaft and an oil recovery container forming a cover extending near the upper end of the outer rotor in the bearing portion of the compression mechanism supporting the crankshaft. Can be reliably collected,
Furthermore, the oil can be discharged to the upper opening of the oil discharge passage by an annular gap formed between the oil recovery container and the crankshaft. Can be discharged.

[0015] Further objects and features of the present invention will become apparent from the following detailed description and drawings. Each feature of the present invention can be used alone or in various combinations in combination as far as possible.

[0016]

Embodiments of the present invention will be described below with reference to FIG. 1 to provide an understanding of the present invention.

However, the present invention is based on the following embodiments.
It is not intended to limit the scope of the present invention to them only, but is merely an illustrative example.

A vertical hermetic electric compressor according to the present embodiment will be described with reference to the drawings, taking a hermetic electric scroll compressor as an example.

In FIG. 1, a compression mechanism 1 comprises a fixed scroll 3 having fixed spiral blades 2, a orbiting scroll 6 in which orbiting spiral blades 4 are formed on a orbiting end plate 5, and an Oldham ring 8. The fixed scroll 3 is fixed to the closed container 10 together with the bearing member 9. An orbiting scroll shaft 7 is provided on the surface of the orbiting scroll plate 6 opposite to the orbiting scroll blades 4 of the orbiting scroll plate 5, and the orbiting scroll shaft 7 is provided at a lower portion of the bearing member 9 and the sealed container 10. An electric motor section 16 including a rotor 15 that rotates together with a crankshaft 12 rotatably supported by the bearing member 11 is disposed.

When the electric motor 16 is driven, the crankshaft 12 rotates, and the crankshaft 12 performs eccentric rotation. As a result, the orbiting scroll 6 rotates, but the rotation is restricted by the Oldham ring 8, so that the orbiting scroll performs the orbital movement with the radius between the crankshaft 12 and the orbiting scroll shaft 7 of the orbiting scroll 6 as a radius. . As a result, the fixed scroll blade 2 of the fixed scroll 3 and the orbiting scroll blade 4 of the orbiting scroll 6 are moved one by one.
A plurality of compression working spaces 17 formed by meshing with each other in a state of being rotated by 80 degrees form a suction port provided in the compression mechanism unit 1 for a low-pressure refrigerant gas sucked from a suction pipe 18 attached to the closed container 10. The compression work is continuously performed as the volume of the compression work space 17 decreases. The compressed high-pressure refrigerant gas is discharged from a discharge port 20 provided in the compression mechanism unit 1 to a discharge port side space 29 of the internal space of the closed casing 10.

The internal space of the sealed container 10 is
As a result, the discharge port side space 29 and the electric motor 16
The space 29 is divided into a motor unit-side space 30 in which is installed. The spaces 29 and 30 are communicated with each other by a communication port 21 provided in the compression mechanism 1. Therefore, the high-pressure refrigerant gas discharged into the discharge port side space 29 is connected to the communication port 2.
1 through the bearing member 9 and the motor unit side space 30
Flows into. An annular gap 22 is formed on the outer periphery of the stator 14 of the electric motor section 16 in the up-down direction with respect to the closed casing 10 substantially coaxially with the communication port 21. Thereby, the main flow of the downward high-pressure refrigerant gas flowing into the motor unit side space 30 passes through the lower part of the stator 14 from the gap 22 and passes through the gap 23 between the stator 14 and the rotor 15 of the motor unit 16. The discharge gas passage 3 provided in the lower part of the compression mechanism part 1 from the lower part of the closed container 10
3 and is finally supplied to the outside of the closed container 10.

On the other hand, a lubricating oil pump 24 is provided on the sub-bearing member 11 of the crankshaft 12 provided at the lower part of the closed casing 10, and the lubricating oil pump 24 is provided at the bottom part forming the lower part of the closed casing 10. The oil is pumped from the lubricating oil reservoir 25 to the compression mechanism 1 through a communication port 26 of the crankshaft provided at the center of the crankshaft 12. And this communication port 2
6 lubricates the orbiting scroll shaft 7 of the compression mechanism 1 and furthermore the main bearing 13a of the crankshaft 12
Lubricate.

An oil recovery passage is provided between the crankshaft 12 and an oil recovery container 31 forming a cover extending near the upper end of the outer rotor 15 in the bearing member 9 of the compression mechanism 1 supporting the crankshaft 12. 40 are formed. An oil discharge passage 3 is formed in the rotor 15 of the electric motor section 16 so as to form an annular upper opening 32a around the axis so as to penetrate in the vertical axis direction.
2 is formed, and an annular gap 3 is formed between the oil recovery container 31 forming the oil recovery passage 40 and the crankshaft 12.
9, the upper opening 32 a of the oil discharge passage 32 provided in the rotor 15 is located within a range opposed to the oil discharge passage 32.

As a result, the oil collected and stored in the oil recovery passage 40 is agitated by the rotation of the balance waist 37 integrally attached to the crankshaft 12, whereby centrifugal force is given to the oil. It is pressed against the side wall of the oil recovery container 32 by the action of the force. On the other hand, the rotation of the balance waist 37 and the rotation of the rotor 15 coaxially rotate the oil discharge passage 32. The rotor 15 is positioned within a range opposed to an annular gap 39 formed between the oil recovery container 31 as the oil recovery passage 40 and the crankshaft.
The annular upper opening 32a of the oil discharge passage 32 centered on the shaft
Is formed, the oil recovery container 32 as a cover
When the centrifugal force is applied to the oil, the oil is subjected to the same centrifugal force to form an oil in the annular upper opening 32 of the rotated oil discharge passage 32.
a, and is discharged from the lower opening 32b of the oil discharge passage 32 and falls down.

The lower opening 32b of the oil discharge passage 32 is
The lubricating oil reservoir 25 is provided below the motor unit 16 at the lower part of the sealed container 10 so as to face the lubricating oil reservoir 25. As a result, the oil discharged from the lower opening 32b through the oil discharge passage 32 and transmitted down does not ride on the high-pressure refrigerant gas that rises due to the rotating centrifugal force in the closed vessel 10 and remains separated from the high-pressure refrigerant gas. The lubricating oil can be returned directly to the lubricating oil reservoir 25 provided at the lower part of the closed container 10, thereby preventing the oil from scattering and reducing the amount of oil splashing.

Thereafter, the lubricating oil pump 24 again draws the lubricating oil from the lubricating oil reservoir 25 to the compression mechanism 1 through the communication port 26 of the crankshaft 12 provided at the center of the crankshaft 12, and repeats the refrigeration cycle.

An annular gap 39 formed between the oil recovery container 31 as the oil recovery passage 40 and the crankshaft 12.
Although there is a gap between the rotor 15 and the rotor 15, almost no oil flows into the electric motor unit side space 30 from the gap due to the action of the centrifugal force, so that scattering of oil by the rotor 15 is also prevented.

By providing the oil discharge passage 32 in the rotor 15 of the electric motor unit 16 as described above, the oil used for lubricating the compression mechanism 1 and the crankshaft 12 can be supplied to the oil discharge passage 3.
Since the lubricating oil reservoir can be directly returned to the lubricating oil reservoir at a position below the motor unit 16 which is not affected by the agitating action of the rotor 15 of the motor unit 16 from the motor 2, the flow multiplied by the high-pressure refrigerant gas rising due to the centrifugal force and the motor Oil is prevented from being scattered from the wind pressure generated by the rotor of the section, the ratio of lubricating oil mixed into the high-pressure refrigerant gas discharged to the outside of the closed vessel is reduced, and piping pressure loss in the refrigeration cycle and condenser and A decrease in heat exchange efficiency in a heat exchanger such as an evaporator is prevented.

As described above, the ratio of the lubricating oil mixed into the high-pressure refrigerant gas discharged to the outside of the closed container can be reduced, so that the discharge passage in the closed container 10 for separating gas and liquid is lengthened to cause collision. In order to increase the number of separation points, it is not necessary to adopt a configuration in which the discharge gas is discharged from the top surface through the discharge passage of the bearing member 9, and the discharge gas passage 33 of the sealed container 10 is provided below the compression mechanism 1. The structure of the discharge passage in the sealed container 10 can be simplified.

The oil recovery passage 40 is provided between the crankshaft 12 and the oil recovery container 31 forming a cover extending near the upper end of the outer rotor 15 in the bearing member 9 of the compression mechanism 1 supporting the crankshaft 12. The upper opening 32 a of the oil discharge passage 32 provided in the rotor 15 is opposed to an annular gap 39 formed between the oil recovery container 31 and the crankshaft 12. The oil recovery container 31 forming this cover
Oil recovery passage 40 formed between the shaft and the crankshaft 12
And the oil recovery container 31
Annular gap 3 formed between the lower part of the shaft and the crankshaft 12
9, the oil can be discharged to the upper opening 32a of the oil discharge passage 32, so that the oil can be reliably discharged to the lower portion of the electric motor section 16 through the upper opening 32a of the oil discharge passage 32 provided in the rotor 15. Become like

Further, the oil discharge passage 3 provided in the rotor 15
The lower opening 32b of the second closed container 1
0, which is located in the vicinity of the lubricating oil reservoir 25 provided at the lower part which is provided at the lower part of the high-pressure refrigerant gas. Separated oil discharged from the lower opening 32b is prevented from being scattered, and the amount of oil scattered is reduced. As a result, the ratio of lubricating oil mixed into the high-pressure refrigerant gas discharged to the outside of the closed container can be reduced. .

In this embodiment, an example of a vertical hermetic electric scroll compressor has been described. However, the present invention is not limited to this configuration, and other vertical hermetic electric compressors, for example, hermetic rotary compressors, may be used. It may be applied to machines.

[0033]

According to the present invention, in the hermetic electric compressor of the present invention, a compression mechanism portion is provided in a closed container, and an electric motor portion provided below the compression mechanism portion for driving the compression mechanism portion. A crankshaft for transmitting the rotational force of the electric motor unit to the compression mechanism unit, and lubricating oil in a lubricating oil reservoir provided at a lower portion in the closed container is supplied to the crankshaft bearing unit and the compression mechanism unit through the crankshaft. After being supplied, the lubricating oil reservoir is returned to the lubricating oil reservoir. The high-pressure refrigerant gas discharged from the compression mechanism is passed from above to below the electric motor unit, and then is supplied from above to below to the outside to supply the outside. An oil recovery passage is provided above the rotor of the electric motor portion, and oil used for lubrication of the bearing portion of the crankshaft and the compression mechanism discharged from the oil recovery passage is provided to the rotor of the electric motor portion. This motor from the discharge passage , The oil used for lubricating the compression mechanism and the crankshaft is returned directly to the lubricating oil sump located below the motor, which is not affected by the stirring effect of the rotor of the motor. This prevents oil from being scattered from the wind pressure generated by the rotor of the electric motor part that multiplies the high-pressure refrigerant gas that rises due to the rotating centrifugal force, and prevents the lubricating oil from being mixed into the high-pressure refrigerant gas discharged to the outside of the closed container. By reducing the ratio, it is possible to prevent pressure loss in the piping in the refrigeration cycle and decrease in heat exchange efficiency in the heat exchanger such as the condenser and the evaporator.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hermetic scroll compressor according to an embodiment of the present invention.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compression mechanism part 2 Fixed spiral blade 3 Fixed scroll 4 Revolving spiral blade 5 Revolving head plate 6 Revolving scroll 7 Revolving scroll shaft 8 Oldham ring 9 Bearing member 10 Hermetic container 11 Secondary bearing member 12 Crankshaft 13 Eccentric hole portion 14 Stator 15 Rotation Child 16 motor unit 17 compression work space 18 suction pipe 19 suction port 20 discharge port 21 communication port 24 lubricating oil pump 25 lubricating oil reservoir 27 oil recovery unit 29 discharge port side space 30 motor unit space side 31 oil recovery container 32 oil discharge passage 33 discharge gas passage 40 oil recovery passage

Claims (2)

[Claims] 1. A compression mechanism in a closed container, an electric motor for driving a compression mechanism provided below the compression mechanism, and a motor for transmitting a rotational force of the electric motor to the compression mechanism. And a lubricating oil reservoir provided at a lower portion in the closed container is supplied to a bearing portion and a compression mechanism portion of the crankshaft through the crankshaft, and then returned to the lubricating oil reservoir again. After passing the discharged high-pressure refrigerant gas downward from above the motor section, in a hermetic electric compressor that supplies the outside through the upper section from below, an oil recovery passage is provided above the rotor of the motor section, The oil discharged from the oil recovery passage and used for lubricating the bearing portion and the compression mechanism of the crankshaft is discharged from the oil discharge passage provided in the rotor of the electric motor portion to below the electric motor portion. Characteristic sealing Type electric compressor. 2. The oil recovery passage is formed between a crankshaft and an oil recovery container forming a cover extending near an upper end of an outer rotor in a bearing portion of a compression mechanism supporting a crankshaft, The upper opening of an oil discharge passage provided in the rotor is located in a range facing the annular gap formed between the lower portion of the oil recovery container and the crankshaft. The hermetic electric compressor according to claim 1.