JPH0544666A - Scroll compressor - Google Patents

Abstract

PURPOSE:To sufficiently supply oil to a slidable part even if bubbles are generated in a coolant in an oil feeding passage by the sharp pressure variation on start. CONSTITUTION:A penetration hole 43 is formed on a driving shaft, and one edge of the penetration hole 43 is opened to the periphery of an eccentric bearing 17, and the other is opened to the space formed of the edge port of an electric motor 3 and a part of a sealed container 1, and a lubricating oil reservoir 7 is formed in proximity with a compression mechanism part 2. An oil suction passage 35 is formed front the lubricating oil reservoir 7 to a turning driving shaft, and the oil is supplied to the eccentric bearing 17, and an oil feeding passage is formed to the opened port edge of the penetration hole 43 on the driving shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to lubrication and lubrication of 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 arranged inside a closed container, and the compression mechanism is formed on a fixed end plate with fixed spiral blades. And a swirling spiral blade part in which swirling swirl blades that mesh with the fixed spiral swirl blade and form a plurality of compression work spaces are formed on a swirling end plate, and a rotation that prevents the swirling swirl blade part from rotating and only rotates. A restraint part, a crankshaft for driving the swirl vane part to rotate, and a bearing part having a main bearing for supporting a main shaft formed at one end of the crankshaft, the discharge gas of the compression mechanism being included in the crank part. Discharging into a space including a shaft and the electric motor, and forming a turning drive shaft on a side opposite to the turning spiral blade of the turning end plate,
The slewing drive shaft is fitted into an eccentric bearing provided eccentrically inside the main shaft of the crankshaft, and between the outside of the slewing drive shaft and an oil pump cylinder inner wall provided concentrically with the center of the main shaft of the crankshaft. An annular pump ring is interposed in the oil pump, and an oil pump partition plate for partitioning the suction side and the discharge side is arranged between the pump ring and the inner wall of the oil pump cylinder to form an oil pump, and close to the compression mechanism. A lubricating oil reservoir is provided, an oil suction passage is provided from the lubricating oil reservoir toward the suction side of the oil pump, and the oil discharge port of the oil pump passes through an oil discharge chamber toward the eccentric bearing and / or the main bearing. A refueling route for refueling is formed.

[0003]

In the above oil supply path, the lubricating oil is supplied from the oil sump to the sliding portion by the force of the pump, but the structure is complicated and the pressure at the time of starting is constant. If it changes abruptly, the refrigerant will foam in the oil supply path, bite the gas into the pump, fail to exert sufficient pumping capacity, and the oil supply to the sliding parts will be insufficient, which may cause bearing damage. there were.

[0004]

[Means for Solving the Problems] A through hole is provided in a drive shaft,
One end of the through hole is opened around the eccentric bearing, and the other is opened in the space consisting of the motor end and the closed container.A lubricating oil reservoir is provided close to the compression mechanism. An oil suction passage is provided to supply oil to the eccentric bearing and form an oil supply path reaching the opening 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 portion to the upper part of the electric motor, and there is a pressure difference generated at the both ends of the discharge refrigerant gas flowing around the motor. However, the pressure in the sliding part is lower than that in the oil sump, and the oil can be supplied by the pressure difference, which simplifies the structure.In addition, the drive shaft through hole is located near the sliding part due to a sudden change in pressure. It also works to release the generated gas, and the gas bite does not live in the sliding part and the oil passage, and it works to always supply a sufficient amount of oil.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, FIG. 1 is a vertical sectional view of a scroll compressor, and FIG. 2 is a partially enlarged view of a compression mechanism portion thereof.
FIG. 3 shows details of the oil supply passage to the main bearing.

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

The compression mechanism 2 includes a fixed spiral blade component 10 having a fixed spiral blade 9 formed integrally with a fixed end plate 8 and a plurality of compression work spaces 1 which mesh with the fixed spiral blade 9.
4, the swirling spiral blade 11 forming the swirling spiral blade 11 on the swirling end plate 12, and the rotation restraining component 1 for preventing the swirling spiral blade component 13 from rotating and only rotating.
5, a swivel drive shaft 16 provided on the opposite side of the swirl vane 11 of the swirl end plate 12, and an eccentric bearing 17 provided inside the main shaft 18 of the crankshaft 6 into which the swivel drive shaft 16 is fitted.
And a main bearing 19 for supporting the main shaft 18 of the crankshaft 6.
The bearing component 21 having the above and the end plate movement limiting surface 22 for limiting the axial movement of the swirl spiral blade component 13 are arranged with a minute gap from the back face 20 of the swirl end plate 12 on the back face of the swirl end plate 12.

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

Therefore, a pressure difference is generated between the upper side and the lower side of the electric motor. The lubricating oil in the lubricating oil sump 7 enters the oil sump chamber 36 from the oil suction passage 35. A part of the lubricating oil in the oil sump chamber 36 is provided on the surface of the main shaft 18 so as not to directly communicate with the oil sump chamber 36 via the main shaft oil supply passages 37 and 38 from the vicinity of the surface of the orbiting drive shaft 16. After being guided to the oil groove 39 and lubricating the main bearing 19, it is discharged to the balance weight chamber 40. Oil sump chamber 3
The other part of the lubricating oil of No. 6 lubricates the eccentric bearing 17 through the orbiting drive oil groove 42 in which the oil groove inlet 41 is arranged on the surface of the orbiting drive shaft 16, and then penetrates by the differential pressure at both ends of the crankshaft 6. The oil is discharged to the balance weight chamber 40 through the hole 43 and the lubricating oil discharge port 44.

The through hole 43 also has a function of removing gas when a forming phenomenon occurs.

[0012]

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

(1) Stable refueling 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,
It is possible to prevent gas entrapment in the oil supply route, and improve reliability.

(3) Since no special pump is required, the cost can be reduced.

[Brief description of drawings]

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

FIG. 2 is an enlarged cross-sectional view of the relevant part.

3A is a partially cutaway front view of the same main part, FIG. 3B is a front view of the same main part, and FIG. 3C is a top view of the same main part.

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

[Explanation of symbols]

 1 Airtight Container 2 Compression Mechanism 3 Electric Motor 6 Crankshaft 7 Lubricating Oil Reservoir 9 Fixed Swirl Blade 11 Swirling Swirl Blade 16 Swivel Drive Shaft 17 Eccentric Bearing 35 Oil Suction Passage 43 Through Hole 44 Lubricating Oil Outlet

Claims (2)

[Claims] 1. An electric motor and a compression mechanism part driven by this electric motor are arranged inside a closed container, a closed space is divided by this electric motor, and the compression mechanism part is arranged in one of the spaces.
The gas compressed by the compression mechanism section is discharged into the space where the compression mechanism section is arranged, passes through the periphery of the electric motor, and into the other closed space formed by the end of the electric motor and a part of the closed container. Leading, from the closed space, the compression mechanism portion of the hermetic compressor to be discharged to the outside of the closed container, a fixed spiral blade component forming a fixed spiral blade on the fixed end plate,
A swirling spiral vane component in which swirling swirl vanes that mesh with the fixed spiral swirl vanes to form a plurality of compression work spaces are formed on a swirling end plate, and a rotation restraining component that prevents the swirling spiral vane component from rotating and only rotates. A drive shaft for driving the swirl vane component to rotate, a swivel drive shaft and an eccentric bearing provided eccentrically from the center of the drive shaft on a side of the drive shaft end opposite to the swirl swirl vane of the swivel end 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. A lubricating oil reservoir is provided in the vicinity of the compression mechanism portion, an oil suction passage is provided from the lubricating oil reservoir toward the orbiting drive shaft, and the eccentric bearing is supplied with oil to reach the opening end of the drive shaft through hole. The disk that forms the refueling path Lumpur compressor. 2. A scroll compressor according to claim 1, wherein an electric motor is arranged in an upper part and a compression mechanism part is arranged in a lower part in a hermetic container, and a lubricating oil reservoir is provided around the compression mechanism part.