JP3252404B2 - 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 lubrication and lubrication for a hermetic scroll compressor used for refrigeration and air conditioning.

[0002]

2. Description of the Related Art As shown in FIG. 4, an electric motor and a compression mechanism driven by the electric motor are disposed inside a closed container, and the compression mechanism is a fixed spiral blade part having fixed spiral blades formed on a fixed head plate. A swirling spiral blade member formed on a swiveling head plate and having a plurality of swirling spiral blades meshing with the fixed swirling blade to form a plurality of compression working spaces; and a rotation preventing rotation of the swirling spiral blade component and only performing rotation. A constraining component, a crankshaft for driving the swirl vane component to rotate, and a bearing component having a main bearing for supporting a main shaft formed at one end of the crankshaft. Discharging to a space containing a shaft and the electric motor, forming a turning drive shaft on the opposite side of the turning spiral blade of the turning end plate,
The turning drive shaft is fitted into an eccentric bearing provided eccentrically inside the main shaft of the crankshaft, and between the outside of the turning drive shaft and an inner wall of an oil pump cylinder provided concentrically with the center of the main shaft of the crankshaft. An oil pump partition plate is provided between the pump ring and the inner wall of the oil pump cylinder to partition the suction side and the discharge side between the pump ring and the inner wall of the oil pump. A lubricating oil reservoir is provided, and an oil suction passage is provided from the lubricating oil reservoir toward the suction side of the oil pump, and from the oil discharge port of the oil pump to the eccentric bearing and / or the main bearing via an oil discharge chamber. A refueling path for refueling is formed.

[0003]

In the above-described oil supply path, the supply of lubricating oil from the oil reservoir to the sliding portion is performed by the power of the pump. In the case of a sudden change, the refrigerant foams in the oil supply path, gasses the pump, fails to exhibit sufficient pumping capacity, and insufficient oil supply to the sliding parts, possibly causing bearing damage. there were.

[0004]

A through hole is provided in the drive shaft,
One end of the through hole is opened in the vicinity of the eccentric bearing, the other is opened in the space consisting of the motor end and the sealed container, and a lubricating oil reservoir is provided near the compression mechanism. An oil suction passage is provided toward the eccentric bearing to supply oil to the eccentric bearing, thereby forming an oil supply path leading to the open end of the drive shaft through hole.

[0005]

The through hole provided in the drive shaft is opened from the upper part of the sliding part to the upper part of the motor, and a pressure difference is generated at both ends when the discharged refrigerant gas flows around the motor. However, the sliding part has a lower pressure than the oil sump part, and the oil can be supplied with the pressure difference. This simplifies the structure, and the through hole of the drive shaft is located near the sliding part due to sudden change in pressure. It also works to release the generated gas, so that the gas is not alive in the sliding portion and the oil path, and always acts to supply a sufficient amount of oil.

[0006]

FIG. 1 is a longitudinal sectional view of a scroll compressor, FIG. 2 is a partially enlarged view of a compression mechanism, and FIG.
FIG. 3 shows details of the oil supply passage to the main bearing.

[0007] A compression mechanism 2 is fixed below the inside of the closed container 1, a stator 4 of a motor 3 for driving the compression mechanism 2 is fixed above, and a crankshaft for driving the compression mechanism 2 on a rotor 5 of the motor 3. 6 to form a lubricating oil reservoir 7 around the compression mechanism 2 below the closed container 1.

The compression mechanism 2 includes a fixed scroll blade part 10 having a fixed scroll blade 9 integrally formed with a fixed head plate 8, and a plurality of compression working spaces 1 engaged with the fixed scroll blade 9.
A swirl-vane component 13 in which a swirl-vane 11 forming a part 4 is formed on a revolving head plate 12 and a rotation-restricting component 1 that prevents the revolving-vortex-blade component 13 from rotating and only turns.
5, a turning drive shaft 16 provided on the opposite side of the turning spiral blade 11 of the turning end plate 12, and an eccentric bearing 17 provided inside the main shaft 18 of the crankshaft 6 and into which the turning drive shaft 16 fits.
And a main bearing 19 for supporting a main shaft 18 of the crankshaft 6.
And a head moving restriction surface 22 for restricting the axial movement of the swirling spiral blade part 13 with a small gap from the turning head back 20 on the back of the turning head 12.

The refrigerant gas sucked from the suction pipe 23 of the compressor passes through the accumulator 24, enters the compression mechanism 2 from the suction port 25 of the compression mechanism 2, is compressed in the compression working space 14, and is discharged from the discharge port 26. The gas is discharged into a motor lower discharge chamber 30 between the electric motor 3 and the compression mechanism 2 through a discharge passage 28 provided in the fixed end plate 8 and a discharge passage 29 provided in the bearing component 21 inside the muffler 27. The discharged refrigerant gas passes through the discharge passage 32 above the electric motor from the electric motor peripheral passage 31 to cool the electric motor 3, and then is guided from the discharge pipe 34 to the outside of the compressor through the discharge chamber 33.

Therefore, a pressure difference occurs between the upper part and the lower part of the electric motor. The lubricating oil in the lubricating oil reservoir 7 enters the oil reservoir 36 from the oil suction passage 35. A part of the lubricating oil in the oil sump 36 is provided from the vicinity of the surface of the turning drive shaft 16 via the main shaft oil supply passages 37 and 38 to the surface of the main shaft 18 so as not to directly communicate with the oil sump 36. After being guided to the oil groove 39 and lubricating the main bearing 19, it is discharged to the balance weight chamber 40. Oil reservoir 3
The other part of the lubricating oil 6 lubricates the eccentric bearing 17 through the turning drive oil groove 42 in which the oil groove inlet 41 is arranged on the surface of the turning drive shaft 16, and then penetrates by the differential pressure between both ends of the crankshaft 6. The liquid is discharged to the balance weight chamber 40 through the lubricating oil discharge port 44 by ascending the hole 43.

The through hole 43 also functions to remove gas when a forming phenomenon occurs.

[0012]

The refrigerant gas discharged from the compression mechanism passes through the peripheral passage of the motor and reaches the discharge chamber, so that a pressure difference is generated between both ends of the motor, that is, both ends of the crankshaft through hole.
Since the turning drive shaft and the eccentric bearing are lubricated using this pressure difference, the following effects can be obtained.

(1) Stable lubrication is possible, and reliability is improved. (2) Since the crankshaft through hole also functions as a gas vent, even if gas is generated due to the forming phenomenon,
Gas entrapment in the oil supply path can be prevented, and reliability is improved.

(3) Since a special pump is not required, it can be constructed at a low cost.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view of a main part of the same.

FIG. 3 (a) is a front view of the main part with a partial cutaway, (b) is a front view of the main part, and (c) is a top view of the main part.

FIG. 4 is a longitudinal sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Compression mechanism part 3 Electric motor 6 Crankshaft 7 Lubricating oil reservoir 9 Fixed spiral blade 11 Rotating spiral blade 16 Rotating drive shaft 17 Eccentric bearing 35 Oil suction passage 43 Through hole 44 Lubricating oil discharge port

Claims (2)

(57) [Claims] An electric motor and a compression mechanism driven by the electric motor are disposed inside the closed container, the enclosed space is separated by the electric motor, and the compression mechanism is disposed in one of the spaces.
The gas compressed by the compression mechanism is discharged into a space in which the compression mechanism is disposed, passes through the periphery of the electric motor, and flows into the other enclosed space including an end of the electric motor and a part of the closed container. Guided, from the closed space, the compression mechanism portion of the hermetic compressor that discharges out of the closed container, a fixed spiral blade component formed with a fixed spiral blade on a fixed head plate,
A swirling swirl blade part having a swirl swirl blade formed on a swivel head plate that meshes with the fixed swirl blade to form a plurality of compression work spaces; and a rotation restraint component that prevents the swirl swirl blade part from rotating and only turns A drive shaft for rotating and driving the swirl vane component, a swivel drive shaft and an eccentric bearing provided eccentrically from the center of the drive shaft on the drive shaft end and on the opposite side of the swirl vane of the swivel head plate, and the drive shaft The drive shaft is provided with a through hole, one end of the through hole is opened around the eccentric bearing, and the other is opened in a space formed by the end of the electric motor and the closed container. Providing a lubricating oil reservoir adjacent to the compression mechanism, providing an oil suction passage from the lubricating oil reservoir toward the turning drive shaft, supplying oil to the eccentric bearing, and reaching an opening end of the drive shaft through hole. A screen with a lubrication path Lumpur compressor. 2. The scroll compressor according to claim 1, wherein an electric motor is disposed at an upper part and a compression mechanism is disposed at a lower part in the closed container, and a lubricating oil reservoir is provided around the compression mechanism.