JP3039072B2 - Hermetic compressor - Google Patents

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 air compressor for refrigeration and air conditioning.

[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, and the inner rotor 125 Is fitted on a pump shaft 126 formed at the end of the crankshaft 106. Furthermore, casing 12
3 is connected to an oil suction pipe 127.
The lower end of 27 is immersed in the lubricating oil reservoir 107.

On the other hand, the crankshaft 106 and the pump shaft 12
An oil feed passage 128 is formed in 6, one of which is connected to the trochoid pump, and the other is connected to each sliding portion of the compression mechanism 102.

[0005] 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 port 130, passes through the discharge pipe 131 provided in the closed casing 101, and goes out of the compressor. Ejected (Japanese Unexamined Patent Publication No.
No. 60092).

[0006]

In the conventional compressor described above, the trochoid pump is mounted in the auxiliary bearing 121, so that the trochoid pump must be installed on a series of compressor assembly lines. In addition, the auxiliary bearing 121 has a problem that the number of assembling steps is increased because the main bearing 119 and the shaft center must be accurately aligned.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an oil supply device which can be incorporated in a hermetic compressor at low cost.

[0009]

The first for Solving the Problems In order to solve the problems]
One technical means is that an electric motor, a compression mechanism driven by the electric motor, a lubricating oil reservoir is provided at the bottom, and a crankshaft that transmits the rotational force of the electric motor to the inside of the closed container, A main bearing member having a main bearing for supporting the main shaft formed on the crankshaft; and a sub-bearing for supporting a shaft portion of the crankshaft opposite to the main shaft is fixed to the inner wall of the closed container. A casing disposed and fixed to the partition wall member and having a suction hole, a gear pump in which external teeth and internal teeth are relatively rotatably mounted in the casing, and a gear pump in which the casing is sealed and sealed. A partition plate having a discharge hole, a side plate sealing the discharge hole to form a discharge oil supply path, and a pump shaft fitted with the internal teeth at an end of the crank shaft opposite to the main shaft. An oil supply device is provided on the partition member. .

[0010] To solve the problemSecond technical means
Is a motor and a motor driven by this motor inside the closed container.
A compression mechanism, and a lubricating oil reservoir disposed at the bottom,
And a crankshaft for transmitting the rotational force of the electric motor.
A main bearing having a main bearing for supporting a main shaft formed on a link shaft
And a main shaft of the crankshaft.
Auxiliary bearing that supports the side shaft is fixed to the inner wall of the closed container
The auxiliary bearing of the partition member
With a convex part that fits into the mounting hole for
And the external teeth and internal teeth are relatively biased in this casing.
Remove the gear pump mounted so that it can rotate
-Operate the gear pump of the lubrication device by inserting the shaft into the internal teeth
Completed as possible, on the opposite side of the crankshaft main shaft
A pump shaft fitted with the internal teeth is formed at the end of the pump.
Remove the dummy shaft from the pump shaft and attach the lubrication device
That is,

[0012]

The function of the first technical means is to seal a gear pump mounted eccentrically and rotatably in a casing having a suction hole, and to form a partition plate having a discharge hole of the gear pump, It is possible to optimally select the position and shape of the discharge hole by configuring it with side plates that are sealed and formed a discharge oil supply path,
Further, since the suction path and the discharge path of the oil supply device are separated, leakage of lubricating oil from the discharge path to the suction path can be reduced, and the lubrication efficiency of the gear pump can be improved. By double sealing, the operating noise of the gear pump during compressor operation can be reduced.

The function of the second technical means is to temporarily assemble the lubricating device with the dummy shaft before fitting the oiling device to the partition member, so that the gear pump does not need to be assembled on the assembly line of the compressor. Has the advantage that the performance of the refueling device can be independently guaranteed by using the dummy shaft.

[0014]

1 and 2 show one embodiment of the present invention.

In FIG. 1, a stator 4 of an electric motor 3 for driving a compression mechanism 2 is fixed inside a closed 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 sealed 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 formed integrally with a fixed frame 8, and a swirling spiral blade that 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. It is supported by a main bearing member 20 having a bearing 19 and a partition member 21 having an auxiliary bearing 22 that supports a shaft portion of the crankshaft 6 on the opposite side of the main shaft 17. The partition member 21 is fixed to the inner wall of the closed casing 1, and the auxiliary bearing 22 is disposed and fixed in a mounting hole 23 provided in the partition member 21. Further, the partition member 21 has a casing 25 having a convex portion 24 fitted and inserted into the mounting hole 23, and a gear pump in which external teeth 26 and internal teeth 27 are relatively eccentrically mounted in the casing 25. An oil supply device 31 including a pump shaft 30 fitted with the internal teeth 27 is provided at an end 29 of the crankshaft 6 opposite to the main shaft 17.

The casing 25 has a suction hole 32.
Is formed and immersed in the lubricating oil reservoir 7, and the lubricating oil sucked by the lubricating device 31 is supplied to the crankshaft 6
Is supplied through a lubricating oil flow path 33 provided at the axis of the shaft.

The oil supply device 31 includes a partition plate 35 that seals the casing 25 and has a discharge hole 34 of the gear pump 28, and a side plate that seals the discharge hole 34 and forms a discharge oil supply passage 36. 37 and the main shaft 1 of the crankshaft 6
A pump shaft 30 fitted to the internal teeth 27 is provided at the end opposite to the end 7.

The oil supply device 31 is provided with the partition member 2.
Before fitting and inserting the dummy shaft 38 into the pump shaft 30
Instead of this, the dummy shaft is extracted and the lubricating device 31 is assembled to the pump shaft 30. That is.

[0021]

A first effect of the present invention is that an electric motor, a compression mechanism driven by the electric motor, and an oil sump are disposed at the bottom inside the closed container, and the compression mechanism is driven by the rotational force of the electric motor. And a main bearing member having a main bearing for supporting the main shaft formed on the crankshaft, and the auxiliary bearing for supporting a shaft portion of the crankshaft opposite to the main shaft is hermetically sealed. A casing fixed to a partition member fixed to the inner wall of the container and having a suction hole, a gear pump in which external teeth and internal teeth are relatively eccentrically mounted in the casing, and the casing is sealed. And a partition plate having a discharge hole of the gear pump, a side plate sealing the discharge hole and forming a discharge oil supply path, and fitting the internal teeth at an end of the crankshaft opposite to the main shaft. Oil supply device comprising a pump shaft to A partition plate that seals a gear pump that is mounted eccentrically and rotatably in a casing of an oil supply device and that has a discharge hole for the gear pump, and a side plate that seals the discharge hole and forms a discharge oil transfer path. With this configuration, the position and shape of the discharge hole can be optimally selected, improving the lubrication efficiency of the gear pump.In addition, the casing is double-sealed with the partition plate and the side plates, and compressed. That is, it is possible to reduce the operating noise of the gear pump during the operation of the machine.

A second effect of the present invention is that an electric motor, a compression mechanism driven by the electric motor, and a lubricating oil reservoir are provided at the bottom inside the closed container, and the compression mechanism controls the rotational force of the electric motor. A closed bearing configured to include a transmitting crankshaft and a main bearing member having a main bearing for supporting the main shaft formed on the crankshaft, and a sub-bearing for supporting a shaft portion of the crankshaft opposite to the main shaft. A casing having a convex portion which is disposed and fixed to a partition member fixed to the inner wall of the partition wall and which is fitted and inserted into a mounting hole for disposing and fixing the sub-bearing of the partition member; The gear pump of the lubricating device is completed by inserting a dummy shaft in advance into the internal teeth with a gear pump mounted so as to be eccentrically rotatable, and an end of the crank shaft opposite to the main shaft. The pump shaft fitted with the internal teeth By extracting the dummy shaft from the pump shaft and assembling the lubricating device, the lubricating device can be temporarily assembled by the dummy shaft before fitting the lubricating device to the partition member, so that the gear pump can be assembled on the compressor assembly line. There is an advantage that the compressor does not need to be implemented and the assembly of the compressor is easy, and further, the performance of the lubricating device can be independently guaranteed by using the dummy shaft.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of one embodiment showing a temporary assembly state of a fueling device according to the present invention.

FIG. 3 is a sectional view of a conventional hermetic 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 19 Main bearing 20 Main bearing member 21 Partition member 22 Secondary bearing 23 Mounting hole 24 Convex part 25 Casing 26 External teeth 27 Internal teeth 28 Gear pump 29 End part Reference Signs List 30 pump shaft 31 oil supply device 34 discharge hole 35 partition plate 36 discharge oil supply path 37 side plate 38 dummy shaft

Continuing on the front page (72) Inventor Sadao Kawahara 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. ) Inventor Shuichi Yamamoto 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture (72) Inside Matsushita Electric Industrial Co., Ltd. No. 1006, Kazuma, Kadoma, Matsushita Electric Industrial Co., Ltd. (72) Inventor Nobuyoshi Kojima 1006, Kadoma, Kadoma, Kazuma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. (56) References JP 2-49990 (JP) , A) JP-A-1-96490 (JP, A) JP-A-59-60092 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 23/00-29/10 331 F04C 18/02 311

Claims (2)

(57) [Claims] Inside of 1. A sealed container, an electric motor, a compression mechanism driven by this electric motor, a crankshaft lubricating oil reservoir disposed at the bottom, the compression mechanism transmitting the rotating force of the motor,
A main bearing member having a main bearing for supporting the main shaft formed on the crankshaft; and a sub-bearing for supporting a shaft portion of the crankshaft opposite to the main shaft is fixed to the inner wall of the closed container. A casing disposed and fixed to the partition wall member and having a suction hole, a gear pump in which external teeth and internal teeth are relatively rotatably mounted in the casing, and a gear pump in which the casing is sealed and sealed. A partition plate having a discharge hole,
The partition member is provided with an oil supply device including a side plate that seals the discharge hole to form a discharge oil supply path, and a pump shaft fitted with the internal teeth at an end opposite to the main shaft of the crankshaft. Hermetic compressor. Inside of 2. A sealed container, an electric motor, a compression mechanism driven by this electric motor, a crankshaft lubricating oil reservoir disposed at the bottom, the compression mechanism transmitting the rotating force of the motor,
A main bearing member having a main bearing for supporting the main shaft formed on the crankshaft; and a sub-bearing for supporting a shaft portion of the crankshaft opposite to the main shaft is fixed to the inner wall of the closed container. A casing having a convex portion which is disposed and fixed to the partition member, and which is fitted and inserted into a mounting hole for disposing and fixing the sub-bearing of the partition member; external teeth and internal teeth are relatively eccentrically rotatable within the casing; A gear pump mounted on a dummy shaft is inserted into the internal teeth in advance to complete the operation of the gear pump of the lubrication device, and the internal teeth are provided at the end of the crankshaft opposite to the main shaft. A method of assembling an oil supply device of a hermetic compressor in which a pump shaft to be fitted is formed, the dummy shaft is extracted from the pump shaft and the oil supply device is assembled.