JPH09195962A - Transverse installation enclosed type scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure sufficient lubricating oil returning at the time of high speed operation by arranging and fixing an auxiliary bearing for supporting the axis part of an opposite side to a main shaft holding the electric motor of a trunk shaft on an auxiliary bearing member, and also arranging an oiling mechanism connected to an oil feed passage arranged in a crank shaft, on the auxiliary bearing member. SOLUTION: Lubricating oil sucked from lubricating oil 7 in an enclosed container 1 by an oil sucking fit 30 is fed from an oil feed passage 31 in a crank shaft 6 to a compression mechanism 2 through a discharge oil passage 34, a part thereof is discharged from the discharging port 38 of a fixed spiral impeller member 10 into the enclosed container 1, and the rest thereof is discharged into the enclosed container 1. Discharged lubricating oil is fed to the space of the oiling mechanism 29 side of the enclosed container 1, and the oil surface level of a lubricating oil sump 7 is raised. Since an oil suck pipe 30 is separated from the rotator 5 of an electric motor 3 by an auxiliary bearing member 21, the lubricating oil sump 7 is not under the influence of agitation of lubricating oil by the rotator 5. It is thus possible to ensure a sufficient oil surface level at the time of high speed operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of 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. Further, the lower part of the closed container 101 is a lubricating oil reservoir 107.

The compression mechanism 102 has a fixed scroll blade member 11 in which a fixed scroll blade 109 is integrally formed on a fixed frame body 108.
0, and a swirling spiral blade member 113 in which swirling spiral blades 111 that mesh with the fixed spiral blades 109 to form a plurality of compression work spaces 114 are formed on a swirl end plate 112.
The rotation end plate 1 has a rotation restraining member 115 that prevents the rotation of the swirling spiral blade member 113 and only rotates.
The swirl drive shaft 116 provided on the opposite side of the swirl spiral blade 111 of the spindle 12 is a main shaft 1 formed at one end of the crankshaft 106.
The crankshaft 106 has a main bearing member 120 having a main bearing 119 for supporting the main shaft 117, and a shaft portion of the crankshaft 106 on the side opposite to the main shaft. It is supported by an auxiliary bearing 121 which is supported. The main bearing 119 and the sub bearing 121 are fixed to the sealed container 101 by welding or the like. Further, the auxiliary bearing 121 is provided with a casing 123 for providing the oil supply mechanism 122 at the end portion of the crankshaft 106. A trochoid pump including an outer rotor 124 and an inner rotor 125 is attached to the casing 123, and the inner rotor 125 is 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 sump 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 of which 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 fed to the oil feeding path 128.
After lubricating each sliding part through the through the through, it is discharged to the closed container 101, and returns to the oil suction pipe 127 through the gap between the electric motor 103 and the closed container 101. Further, the refrigerant sucked from the suction pipe 129 of the compressor is compressed by the compression work space 1 in the compression mechanism 102.
A discharge pipe 131 provided in the closed container 101 near the fixed spiral vane member 110 after being compressed by 14 and passing through the discharge port 130.
And is discharged to the outside of the compressor (JP-A-59-6009).
2).

[0005]

In the conventional compressor described above, the oil suction pipe 127 is provided at a position apart from the compression mechanism 102, and the lubricating oil discharged from the compression mechanism 102 is further sealed with the hermetic container 101 and the electric motor. Since the oil is returned to the oil suction pipe 127 through the narrow gap 103, the lubricating oil does not return easily, and the oil surface level of the lubricating oil sump 107 near the oil suction pipe 127 decreases, especially during high-speed operation, and the oil suction pipe 12
When the tip of No. 7 is opened, gas biting occurs, which causes a problem of running out of oil.

Further, in the conventional compressor, the refrigerant compressed in the compression work space 114 in the compression mechanism 102 passes through the discharge port 130 and then passes through the discharge pipe 131 provided in the closed container 101 near the fixed spiral vane member 110. Since it is discharged to the outside of the compressor, there is a problem that the electric motor 103 does not cool efficiently and the electric motor 103 causes abnormal heat generation.

In view of the above problems, the present invention provides a highly reliable horizontal hermetic scroll compressor capable of ensuring sufficient lubricating oil return even at high speed operation and preventing abnormal heat generation of the electric motor. The purpose is.

[0008]

In order to solve the above problems, according to the present invention, an electric motor and a compression mechanism driven by the electric motor are arranged inside a closed container such that their axes are substantially horizontal. Then, 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 the shaft portion on the opposite side of the main shaft with the electric motor interposed is fixedly mounted on the auxiliary bearing member, and an oil supply mechanism connected to the oil supply passage provided in the crankshaft is arranged on the auxiliary bearing member. In addition, the suction pipe connected to the compression mechanism is provided on the compression mechanism side of the closed container, and the discharge pipe is provided on the oil supply mechanism side.

With the above construction, the lubricating oil after lubricating the compression mechanism by the gas force flowing inside the closed container can be efficiently returned to the vicinity of the oil supply mechanism through the narrow gap between the closed container and the electric motor even during high speed operation. 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 inside a closed container such that their 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 main shaft of the crankshaft on the side opposite to the main shaft with the electric motor interposed therebetween. An auxiliary bearing for supporting the shaft portion is disposed and fixed to the auxiliary bearing member, and an oil supply mechanism connected to an oil passage provided in the crankshaft is disposed on the auxiliary bearing member, and the compression of the hermetic container is performed. 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 structure, the lubricating oil after lubricating the compression mechanism by the gas force flowing inside the closed container can be efficiently returned to the vicinity of the oil supply mechanism through the narrow gap between the closed container and the electric motor even during high speed operation. Further, the electric motor can be efficiently cooled by the refrigerant flowing in the closed container.

[0012]

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

In FIG. 1, a stator 4 of an electric motor 3 for driving a compression mechanism 2 is fixed inside a sealed container 1, and a rotor 5 of the electric 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 closed container 1 is a lubricating oil reservoir 7.

The compression mechanism 2 includes a fixed scroll blade member 10 in which a fixed scroll blade 9 is integrally formed on a fixed frame body 8 and a swirl spiral blade which meshes with the fixed scroll blade 9 to form a plurality of compression work spaces 14. The swirl spiral blade member 13 having the swirl spiral blade member 13 formed on the swirl mirror plate 12 and the rotation restraining member 15 for preventing the rotation of the swirl spiral blade member 13 to rotate only. The 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 crank shaft 6, and the crank shaft 6 supports the main shaft 17. The main shaft 1 with a main bearing member 20 having a bearing 19 and an electric motor interposed therebetween.
Auxiliary bearing 2 for supporting the shaft portion of the crankshaft 6 on the side opposite to 7
It is supported by an auxiliary bearing member 21 having 2 and 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 outer teeth 14 and the inner teeth 25 are eccentrically rotatable in the casing 23, and a main shaft 17 of the crankshaft 6 opposite to the main shaft 17. The end portion 27 is provided with an oil supply mechanism 29 including a pump shaft 28 fitted to the inner teeth 25. An oil suction pipe 30 is formed in the casing 23 and is immersed in the lubricating oil sump 7, and the lubricating oil sucked from the oil supply device 29 is supplied to the crankshaft 6 at the axial center thereof. Oil is supplied to the compression mechanism 2 through an oil passage 31. Further, the oil supply mechanism 29 seals the casing 23 and has a partition plate 33 having a discharge hole 32 of the gear pump 26, and a discharge oil passage 34 that seals the discharge hole 32.
It is composed of a side plate 35 formed with. 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 structure will be described.

As the rotor 5 of the electric motor 3 rotates,
The crankshaft 6 and the eccentric bearing 18 rotate, and the rotation restraint member 1
By the action of 5, the swirling spiral blade member 13 swirls around the fixed spiral blade member 10, and the low pressure refrigerant gas is sucked into the compression work space 14 of the fixed spiral blade 9 and the swirling spiral blade 11.
6, is compressed by the swirling motion of the swirling spiral blade member 13, and is then discharged into the closed container 1 from the discharge port 38 opened in the fixed spiral blade member 13. The discharged refrigerant gas passes through the gap between the closed container 1 and the compression mechanism 2 and the gap between the electric motor 3, and after cooling the electric motor, the refrigerant gas is discharged from the discharge pipe 37 provided on the oil supply mechanism 29 side of the closed container 1 (see FIG. (Not shown). On the other hand, the rotation of the pump shaft 28 formed at the end of the crankshaft 6 causes the oil supply mechanism 29 to rotate.
By rotating the gear pump 26 including the inner teeth 25 and the outer teeth 24 fitted into the casing 23, the oil suction fitting 30 sucks up the lubricating oil from the lubricating oil 7 in the closed container 1. The sucked lubricating oil is discharged through the discharge hole 3 of the partition plate 33.
2 and the discharge oil passage 34 of the side plate 35, the oil is sent from the oil feed passage 31 in the crankshaft 6 to the compression mechanism 2, and a part of the swirling spiral blades is fed to the blade 11 after the sliding portion of the rotation restraining member 15 is lubricated. And the fixed swirl vane 9 to seal the compression work space 14 and then discharged from the discharge port 38 provided in the fixed swirl vane member 10 to the closed container 1 and the rest lubricates the main bearing 19 and the eccentric bearing 18. It is then discharged into the closed container 1. The discharged lubricating oil is divided by the electric motor 3 into the oil supply mechanism 2 of the closed container 1 by the force of the refrigerant gas flowing in the closed container 1.
The oil level of the lubricating oil sump 7 in the vicinity of the oil supply mechanism 29 is sent to the space on the 9th side and rises. 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 sump 7 near the oil suction pipe 30 is provided.
Is less affected by the stirring of the lubricating oil by the rotor 5. Therefore, it is possible to secure a sufficient and stable oil level even during high-speed operation.

[0017]

As described above, the effect of the present invention is that the electric motor and the compression mechanism driven by the electric motor are arranged inside the closed container so that the respective shaft centers are substantially horizontal, and the lubricating oil is provided on the bottom. A reservoir is provided, 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, and the shaft opposite to the main shaft of the crankshaft. A sub-bearing that supports the portion is fixedly mounted on the sub-bearing member, and an oil supply mechanism connected to an oil feed passage provided in the crankshaft is arranged on the sub-bearing member, and the compression mechanism of the closed container is also provided. A suction pipe connected to this compression mechanism is provided on the side, and a discharge pipe is provided on the side of the oil supply mechanism, so that the lubricating oil can be efficiently returned to the vicinity of the oil supply mechanism by the gas force flowing inside the closed container even during high-speed operation. 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 vertical sectional view of a horizontal hermetic scroll compressor according to the present invention.

FIG. 2 is a sectional view of an oil supply mechanism of the present invention.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Airtight 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 passage 36 Suction pipe 37 Discharge pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sadao Kawahara 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Manabu Sakai, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Shuichi Yamamoto 1006, Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor, Shotaro Ito Osaka Kadoma City 1006 Kadoma, Matsushita Electric Industrial Co., Ltd. (72) Inventor Kiyoshi Sawai Osaka 1006 Kadoma, Kadoma-shi, Matsushita Electric Industrial Co., Ltd. (72) Innovator Nojima Kojima Osaka, Kadoma, 1006 Kadoma, Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. An electric motor and a compression mechanism driven by the electric motor are arranged inside a closed container such that their axes are substantially horizontal, a lubricating oil reservoir is provided at the bottom, and the compression mechanism is the electric motor. Of the crankshaft for transmitting the rotational force of the crankshaft and a main bearing member for supporting the main shaft formed on the crankshaft, and a sub-shaft for supporting the shaft portion of the crankshaft opposite to the main shaft with the electric motor interposed therebetween. The bearing is disposed and fixed to the sub-bearing member, and the sub-bearing member is provided with an oil supply mechanism connected to an oil feed passage provided in the crankshaft. A horizontal hermetic scroll compressor provided with a suction pipe connected to the oil supply mechanism and a discharge pipe provided on the oil supply mechanism side.