JPH06147177A - Closed compressor - Google Patents

Abstract

PURPOSE:To prevent vibration of internal teeth so as to reduce noise from a gear pump type oil feed device by providing a holder resiliently interposed between the internal teeth of a gear pump and a fitted pump shaft. CONSTITUTION:A casing 25 having a protrusion 24 fitted in an attaching hole 23 is provided on a partition wall member 21, and is provided with a gear pump 28 in which external teeth 26 and internal teeth 27 are mounted so as to be eccentrically rotatable. Further, a pump shaft 30 fitted in the internal teeth 27, and a holder 32 having one end part inserted and fixed in an oil feed passage 31 in the pump shaft 20 and the other end part resiliently interposed between the internal teeth 27 and a fitted part of the pump shaft 30, are provided to a crank shaft 6 on the side remote from a main shaft 17. With this constitution during operation of the compressor in which lubrication oil is used at a low viscosity, even though air bubbles of coolant are generated in a lubrication oil sumo so that the air bubbles are bit in a trochoid pump, the vibration of the internal teeth may be prevented, thereby it is possible to reduce noise from the oil feed device during operation of the compressor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used as a refrigerant compressor or an air compressor for refrigeration and air conditioning.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, in a compressor of this type, a stator 104 of an electric motor 103 for driving a compression mechanism 102 is fixed inside a sealed container 101, and a rotor 105 of the electric motor 103 is fixed. A crankshaft 106 that drives the compression mechanism 102 is coupled to the crankshaft 106, and the rotation shaft of the crankshaft 106 is arranged 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 110 in which a fixed scroll blade 109 is integrally formed on a fixed frame 108.
A swirl spiral blade member 113 in which swirl spiral blades 111 that mesh with the fixed spiral blade 109 to form a plurality of compression work spaces 114 are formed on a swirl end plate 112, and rotation of the swirl spiral blade member 113 is prevented. And a rotation restraining member 115 for rotating only. The rotation drive shaft 11 is provided on the opposite side of the rotation end plate 112 from the rotation spiral blade 111.
6 is fitted into an eccentric bearing 118 provided inside a main shaft 117 formed at one end of the crank shaft 106, and the crank shaft 106 supports a main bearing 117 for supporting the main shaft 117.
Is supported by a main bearing member 120 having a shaft and a sub bearing 121 that supports the shaft portion of the crankshaft 106 on the side opposite to the main shaft. Further, a casing 123 is formed in the auxiliary bearing 121 at the end of the crankshaft 106 to provide an oil supply mechanism 122, and the casing 123 has a casing 123.
24 and an inner rotor 125 are installed in the trochoid pump.
It is fitted on the pump shaft 126 formed at the end of the. Further, an oil suction pipe 127 is connected to the casing 123,
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 12
An oil supply passage 128 is formed in the inside 6, and one is connected to the trochoid pump and the other is connected to each sliding portion of the compression mechanism 102.

The refrigerant sucked from the suction pipe 129 of the compressor is compressed in the compression work space 114 in the compression mechanism 102, passes through the discharge hole 130, and passes through the discharge pipe 131 provided in the closed container 101 to the outside of the compressor. Discharged (Japanese Patent Laid-Open No. 59-
60092).

[0006]

In the conventional compressor described above, the pump shaft 126 is fitted to the inner rotor 125 of the trochoid pump, and the lubricating oil is used in a low-viscosity state. During operation, especially when the compressor starts to lie down or when defrosting is performed, bubbles of refrigerant are generated in the lubricating oil sump, and when bubbles are trapped in the trochoid pump, the inner rotor 125 vibrates in the gap. However, there is a problem that noise is generated.

In view of the above problems, it is an object of the present invention to provide a low noise oil supply device which can be incorporated in a hermetic compressor.

[0008]

The technical means for solving the above-mentioned problems is to provide an electric motor, a compression mechanism driven by the electric motor, and a lubricating oil reservoir at the bottom inside a hermetically sealed container. The mechanism is configured to include a crank shaft for transmitting the rotational force of the electric motor and a main bearing member having a main bearing for supporting a main shaft formed on the crank shaft, and the end of the crank shaft opposite to the main shaft is supported. A sub-bearing that is fixed to the partition wall member that is fixed to the inner wall of the hermetically sealed container, and a casing in the partition wall member; and a gear pump in which the outer teeth and the inner teeth are relatively eccentrically rotatable inside the casing. A pump shaft fitted with the internal teeth at an end portion of the crank shaft opposite to the main shaft; and one of which is inserted and fixed in an oil passage formed in the pump shaft and the other of which is the internal teeth. Elasticity in the gap of the fitting part of the pump shaft Is that formed by providing the arranged fixed fueling device cage sandwiched.

[0009]

The function of the above-mentioned technical means of the present invention is that the internal teeth of the gear pump are elastically sandwiched between the inner teeth of the gear pump and the pump shaft to be fitted therein. Vibration is prevented, and noise can be reduced during operation of the compressor of the oil supply device.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of the present invention is shown in FIGS.
Shown in. In the figure, a stator 4 of an electric motor 3 for driving a compression mechanism 2 is fixed inside a closed container 1.
A crankshaft 6 for driving the compression mechanism 2 is connected to the rotor 5 of FIG. 1, 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 spiral blade member 10 in which a fixed spiral blade 9 is integrally formed on a fixed frame body 8 and a swirl spiral blade which meshes with the fixed spiral blade 9 to form a plurality of compression work spaces 14. 11 is provided on the side opposite to the swirling spiral blade 11 of the swirling end plate 12, which has a rotation restraining member 15 for preventing the rotation of the swirling spiral blade member 13 formed on the swirl end plate 12 to rotate only. The swivel drive shaft 16 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 has a main bearing member 20 having a main bearing 19 for supporting the main shaft 17. ,
It is supported by a partition member 21 having an auxiliary bearing 22 that supports the shaft portion of the crankshaft 6 on the side opposite to the main shaft 17. The partition wall member 21 is fixed to the inner wall of the closed container 1, and the auxiliary bearing 22 is disposed and fixed to a mounting hole 23 provided in the partition wall member 21. In addition, this partition member 21
A casing 25 having a convex portion 24 to be fitted and inserted into the mounting hole 23, and an outer tooth 26 and an inner tooth 2 in the casing 25.
Gear pump 28 in which 7 is mounted so as to be relatively eccentrically rotatable
And an end portion 29 of the crankshaft 6 opposite to the main shaft 17
A pump shaft 30 fitted to the inner teeth 27, one of which is inserted and fixed in an oil feed passage 31 formed in the pump shaft 30, and the other is a fitting portion of the inner teeth 27 and the pump shaft 30. There is provided an oil supply device 33 composed of a cage 32 that is elastically sandwiched in the gap.

The casing 25 has a suction port 34.
Is formed and is sunk in the lubricating oil sump 7, and the lubricating oil sucked by the oil supply device 33 is supplied to each part through the oil supply passage 31.

[0013]

A crankshaft having an electric motor, a compression mechanism driven by the electric motor, and a lubricating oil sump at the bottom, and a compression shaft transmitting the rotational force of the electric motor to the compression mechanism. A main bearing member having a main bearing for supporting the main shaft formed in, and a sub-bearing member for supporting an end portion of the crankshaft opposite to the main shaft to a partition member fixed to the inner wall of the hermetic container. A casing is mounted and fixed on the partition member, a gear pump in which outer teeth and inner teeth are mounted in the casing so as to be eccentrically rotatable relative to each other, and the crankshaft is provided at the end opposite to the main shaft. A pump shaft fitted with the inner teeth, one of which is inserted and fixed in an oil feed passage formed in the pump shaft, and the other of which is elastically sandwiched in a gap between the inner teeth and a fitting portion of the pump shaft. A cage provided with an oil supply device Since a cage that is elastically sandwiched is provided in the gap between the inner teeth of the gear pump and the pump shaft that is fitted, the lubricating oil is used in a low viscosity state, especially when the compressor is running When the bubbles of the refrigerant are generated in the lubricating oil pool during the defrosting operation or when the bubbles are trapped in the trochoid pump, the internal teeth are prevented from vibrating during the operation of the compressor. The advantage is that noise can be reduced during machine operation.

[Brief description of drawings]

FIG. 1 is a sectional view of a scroll compressor showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an essential part of FIG. 1, showing a state of incorporation of a cage of the present invention.

FIG. 3 is a perspective view of a cage according to the present invention.

FIG. 4 is a sectional view of a conventional 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 19 Main bearing 20 Main bearing member 21 Partition member 22 Secondary bearing 25 Casing 26 Outer teeth 27 Inner teeth 28 Gear pump 29 End 30 Pump shaft 31 Oil feeding Road 32 Cage 33 Oil supply device

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Sadao Kawahara 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Shuichi Yamamoto 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. ( 72) Inventor Kiyoshi Sano 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. An electric motor and a compression mechanism driven by the electric motor are provided inside the closed container, and a lubricating oil reservoir is provided at the bottom of the closed container to prevent the compression mechanism from rotating the electric motor. A crankshaft for transmission and a main bearing member having a main bearing for supporting a main shaft formed on the crankshaft are included, and a sub-bearing for supporting an end portion of the crankshaft opposite to the main shaft is provided in the closed container. A casing fixed to a partition member fixed to the inner wall, fixed to the partition member, fixed to the partition member, a gear pump in which external teeth and internal teeth are eccentrically rotatable relative to each other, and the crankshaft. A pump shaft fitted with the internal teeth at the end opposite to the main shaft, and one of which is inserted and fixed in an oil feed passage formed in the pump shaft and the other of the internal teeth and the pump shaft. Elastically sandwich it in the gap of the fitting part. Hermetic compressor comprising providing the arranged fixed fueling device retainer that.