JP2910718B2 - Horizontally mounted hermetic scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improving the lubricity of a horizontal hermetic scroll compressor.

[0002]

2. Description of the Related Art Conventionally, in this type of compressor, as shown in FIG. 3, a stator 104 of a motor 103 for driving a compression mechanism 102 is fixed inside a closed container 101, and a rotor 105 of the motor 103 is fixed. A crankshaft 106 for driving the compression mechanism 102 is connected to the crankshaft 106, and the rotation axis of the crankshaft 106 is disposed substantially horizontally. The lower part of the sealed container 101 is a lubricating oil reservoir 107.

The compression mechanism 102 includes a fixed spiral blade member 11 in which a fixed spiral blade 109 is formed integrally with a fixed frame 108.
0, a swirling spiral blade member 113 in which a swirling spiral blade 111 meshing with the fixed spiral blade 109 to form a plurality of compression working spaces 114 is formed on a rotating end plate 112;
A rotation restricting member 115 that prevents the rotation of the swirling spiral blade member 113 from rotating and performs only the rotation.
The turning drive shaft 116 provided on the opposite side of the turning swirl vanes 111 of the main shaft 12 is provided with a main shaft 1 formed at one end of a crankshaft 106.
The crankshaft 106 has a main bearing member 120 having a main bearing 119 supporting the main shaft 117 and a shaft portion of the crankshaft 106 on the opposite side of the main shaft. It is supported by a supporting sub-bearing 121. The main bearing 119 and the sub bearing 121 are fixed to the closed casing 101 by welding or the like. The auxiliary bearing 121 is provided with a casing 123 for providing an oil supply mechanism 122 at an end of the crankshaft 106. A trochoid pump including an outer rotor 124 and an inner rotor 125 is mounted on the casing 123. It is fitted on a pump shaft 126 formed at the end of the crankshaft 106. Furthermore, casing 1
An oil suction pipe 127 is connected to 23, and the lower end of the oil suction pipe 127 is immersed in the lubricating oil reservoir 107.

On the other hand, the crankshaft 106 and the pump shaft 1
An oil feed passage 128 is formed in 26, one of which is connected to the trochoid pump, and the other is connected to each sliding portion of the compression mechanism 102. The lubricating oil sucked from the oil suction pipe 127 by the trochoid pump is supplied to the oil supply passage 128.
After being lubricated to each sliding part, the oil is discharged to the sealed container 101, and returns to the oil suction pipe 127 through a gap between the electric motor 103 and the sealed container 101. The refrigerant sucked from the suction pipe 129 of the compressor is supplied to the compression working space 1 in the compression mechanism 102.
The discharge pipe 131 provided in the closed vessel 101 near the fixed spiral blade member 110 through the discharge port 130 after being compressed at 14
And discharged out of the compressor (see JP-A-59-6009).
2).

[0005]

In the conventional compressor described above, the oil suction pipe 127 is provided at a position separated from the compression mechanism 102, and the lubricating oil discharged from the compression mechanism 102 is supplied to the closed container 101 and the electric motor. Since the lubricating oil is returned to the oil suction pipe 127 through the narrow gap of 103, the return of the lubricating oil is poor. In particular, during high-speed operation, the oil level of the lubricating oil reservoir 107 near the oil suction pipe 127 decreases, and the oil suction pipe 12
The opening of the tip of 7 causes a problem of gas biting and running out of oil.

In the conventional compressor, the refrigerant compressed in the compression working space 114 in the compression mechanism 102 passes through the discharge port 130 and passes through the discharge pipe 131 provided in the closed container 101 near the fixed spiral blade member 110. Since the electric motor 103 is discharged to the outside of the compressor, the electric motor 103 does not efficiently cool and the electric motor 103 generates abnormal heat.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a highly reliable horizontal hermetic scroll compressor which ensures sufficient lubricating oil return even at high speed operation and prevents abnormal heating of the motor. It is intended for.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an electric motor and a compression mechanism driven by the electric motor in an airtight container such that their respective shaft centers are substantially horizontal. A lubricating oil reservoir is provided at the bottom, and the compression mechanism is configured to include a crankshaft that transmits the rotational force of the electric motor, and a main bearing member that supports a main shaft formed on the crankshaft. An auxiliary bearing that supports a shaft portion opposite to the main shaft with the electric motor interposed therebetween is provided and fixed to the auxiliary bearing member, and an oil supply mechanism connected to an oil supply passage provided in the crankshaft is provided on the auxiliary bearing member. In addition, a suction pipe connected to the compression mechanism is provided on the compression mechanism side of the closed container, and a discharge pipe is provided on the oil supply mechanism side.

With the above configuration, even during high-speed operation, the lubricating oil after lubricating the compression mechanism by the gas force flowing inside the sealed container can be efficiently returned to the vicinity of the oil supply mechanism through the narrow gap between the sealed container and the electric motor. Further, the electric motor can be efficiently cooled by the refrigerant flowing in the closed container.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, an electric motor and a compression mechanism driven by the electric motor are arranged in a closed container so that their respective axes are substantially horizontal, and a lubricating oil reservoir is provided at the bottom. The compression mechanism is configured to include a crankshaft that transmits the rotational force of the electric motor, and a main bearing member that supports a main shaft formed on the crankshaft, and the crankshaft on the opposite side of the main shaft across the electric motor of the crankshaft. A sub-bearing for supporting a shaft portion is disposed and fixed to a sub-bearing member, and an oil supply mechanism connected to an oil supply passage provided in the crankshaft is disposed on the sub-bearing member. A suction pipe connected to the compression mechanism is provided on the mechanism side, and a discharge pipe is provided on the oil supply mechanism side.

With the above configuration, even during high-speed operation, the lubricating oil after lubricating the compression mechanism by the gas force flowing inside the sealed container can be efficiently returned to the vicinity of the oil supply mechanism through the narrow gap between the sealed container and the electric motor. Further, the electric motor can be efficiently cooled by the refrigerant flowing in the closed container.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, a stator 4 of a motor 3 for driving a compression mechanism 2 is fixed inside a closed container 1, and a rotor 5 of the motor 3 has a crankshaft 6 for driving the compression mechanism 2.
And the rotation axis of the crankshaft 6 is arranged substantially horizontally. The lower part of the sealed container 1 is a lubricating oil reservoir 7.

The compression mechanism 2 comprises a fixed spiral blade member 10 having a fixed frame member 8 integrally formed with a fixed spiral blade 9, and a swirling spiral blade which meshes with the fixed spiral blade 9 to form a plurality of compression working spaces 14. A rotating spiral blade member 13 formed on a rotating end plate 12; and a rotation restricting member 15 for preventing the rotating spiral blade member 13 from rotating and performing only the rotation. A turning drive shaft 16 provided on the side opposite to 11 is fitted into an eccentric bearing 18 provided inside a main shaft 17 formed at one end of the crankshaft 6, and the crankshaft 6 supports the main shaft 17. A main bearing member 20 having a bearing 19;
Auxiliary bearing 2 for supporting the shaft of crankshaft 6 on the side opposite to 7
The auxiliary bearing member 21 is fixed to the inner wall of the closed container 1. Also,
The auxiliary bearing member 21 has a casing 23, a gear pump 26 in which the external teeth 14 and the internal teeth 25 are relatively eccentrically mounted in the casing 23, and a gear pump 26 on the opposite side of the main shaft 17 of the crankshaft 6. An oil supply mechanism 29 including a pump shaft 28 fitted to the internal teeth 25 is provided at the end 27. An oil suction pipe 30 is formed in the casing 23 so as to be immersed in the lubricating oil reservoir 7, and lubricating oil sucked from the lubricating device 29 is supplied to a shaft provided on the axis of the crankshaft 6. The oil is supplied to the compression mechanism 2 through an oil passage 31. The oil supply mechanism 29 seals the casing 23 and has a discharge hole 32 of the gear pump 26. The partition plate 33 seals the discharge hole 32 and discharges an oil path 34.
Is formed by the side plate 35 formed with the. Further, a suction pipe 36 connected to the compression mechanism 2 is provided on the compression mechanism 2 side of the closed container 1, and a discharge pipe 37 is provided on the oil supply mechanism 29 side.

Next, the operation of the horizontal hermetic scroll compressor having such a configuration will be described.

With the rotation of the rotor 5 of the electric motor 3,
The crankshaft 6 and the eccentric bearing 18 rotate, and the rotation restraining member 1
5, the swirling spiral blade member 13 makes a revolving motion around the fixed spiral blade member 10, and the low-pressure refrigerant gas flows into the compression work space 14 between the fixed spiral blade 9 and the swirling spiral blade 11, and the suction pipe 3.
6, is compressed by the swirling motion of the swirling spiral blade member 13, and is then discharged into the closed container 1 from a discharge port 38 opened in the fixed spiral blade member 13. The discharged refrigerant gas passes through a gap between the sealed container 1 and the compression mechanism 2 and a gap between the electric motor 3 and cools the electric motor. After cooling the electric motor, the refrigerant gas flows from a discharge pipe 37 provided on the oil supply mechanism 29 side of the sealed container 1 to a refrigeration cycle (see FIG. (Not shown). On the other hand, the rotation of a pump shaft 28 formed at the end of the crankshaft 6
When the gear pump 26 including the internal teeth 25 and the external teeth 24 fitted into the casing 23 rotates, the lubricating oil is sucked up from the lubricating oil 7 in the sealed container 1 by the oil suction fitting 30. The sucked lubricating oil is supplied to the discharge holes 3 of the partition plate 33.
After passing through the oil supply passage 31 in the crankshaft 6 to the compression mechanism 2 through the discharge oil passage 34 of the side plate 35 and the side plate 35, a part of the swirling spiral is moved to the blade 11 after lubrication of the sliding portion of the rotation restricting member 15. After being supplied to the gap between the fixed spiral blade 9 and the compression working space 14 and sealing the compressed working space 14, the compressed spiral working member 10 is discharged from the discharge port 38 provided in the fixed spiral blade member 10 to the closed vessel 1, and the rest lubricates the main bearing 19 and the eccentric bearing 18. After that, it is discharged into the closed container 1. These discharged lubricating oils are separated by the electric motor 3 by the power of the refrigerant gas flowing through the inside of the closed container 1.
The oil level of the lubricating oil reservoir 7 near the oil supply mechanism 29 is sent to the space on the side of the oil supply mechanism 29 and increases. Further, since the oil suction pipe 30 of the oil supply mechanism 29 is separated from the rotor 5 of the electric motor 3 by the auxiliary bearing member 21, the lubricating oil reservoir 7 near the oil suction pipe 30.
Is less affected by the stirring of the lubricating oil by the rotor 5. Therefore, a sufficient and stable oil level can be secured even during high-speed operation.

[0017]

As described above, the effect of the present invention is that an electric motor and a compression mechanism driven by the electric motor are arranged inside the closed container so that their respective shaft centers are substantially horizontal, and lubricating oil is provided at the bottom. A shaft provided with a reservoir, the compression mechanism including a crankshaft that transmits the rotational force of the electric motor, and a main bearing member that supports a main shaft formed on the crankshaft, the shaft being opposite to the main shaft of the crankshaft; A sub bearing for supporting the portion is disposed and fixed to a sub bearing member, and an oil supply mechanism connected to an oil supply passage provided in the crankshaft is disposed on the sub bearing member, and the compression mechanism of the closed container is provided. A suction pipe connected to this compression mechanism is provided on the side, and a discharge pipe is provided on the oil supply mechanism side. Even during high-speed operation, the lubricating oil is efficiently returned to the vicinity of the oil supply mechanism by the gas force flowing inside the sealed container. Is sufficient and stable And oil surface level can be secured, it is possible further motors refrigerant flowing sealed container transversely reliable since it efficiently cooled obtain hermetic scroll compressor.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of the lubrication mechanism of the present invention.

FIG. 3 is a longitudinal sectional view of a conventional horizontal scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Compression mechanism 3 Electric motor 6 Crankshaft 7 Lubricating oil reservoir 17 Main shaft 20 Main bearing member 21 Sub bearing member 22 Sub bearing 29 Oil supply mechanism 31 Oil feed path 36 Suction pipe 37 Discharge pipe

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Sadao Kawahara 1006 Kadoma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Shuichi Yamamoto 1006 Kadoma, Kazuma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. (72) Inventor Shotaro Ito 1006 Odaka, Kadoma, Kadoma, Osaka Pref. Kiyoshi Sawai 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture, Japan Matsushita Electric Industrial Co., Ltd. (72) Inventor Nobuyoshi Kojima 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A 59-59 60092 (JP, A) JP-A-62-58094 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04C 18/02 311 F04C 29/02 311

Claims (1)

(57) [Claims] An outer peripheral portion is substantially sealed inside a closed container.
And as provided with an electric motor in contact with the inner wall of the container, sealed disk transversely to the compression mechanism is disposed which is driven by the electric <br/> motor
In a roll compressor, provided at the bottom of the closed container
The rotational force of the electric motor is transmitted to the lubricating oil reservoir and the compression mechanism.
And a main shaft formed on the crankshaft.
Between the main bearing member and the electric motor of the crankshaft.
And a sub-bearing member for supporting a shaft portion opposite to the main shaft.
And supply lubricating oil from the lubricating oil reservoir through an oil suction port.
Oil supply mechanism and a discharge pipe, wherein the discharge pipe and the oil
The suction port is opposite to the compression mechanism with the auxiliary bearing member in between.
A horizontal hermetic scroll compressor, which is disposed in a space on the opposite side .