JPH0539788A - Closed type scroll compressor - Google Patents

Abstract

PURPOSE:To prevent the shortage of lubricating oil and the resulting seizure accident by leaking the lubricating oil from between the back face of a swing scroll end plate and a thrust bearing and by finally discharging the lubricating oil. CONSTITUTION:A ring shaped groove 77 is provided on the surface of a thrust bearing 74 and an oil sealing material 75 is installed in the groove 77 to intercept the flow of oil between the inner peripheral side of at least one face and an outer peripheral side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic scroll compressor.

[0002]

2. Description of the Related Art FIG. 3 is a vertical sectional view of a conventional hermetic scroll compressor. In the figure, a scroll type compression mechanism C is provided in the upper portion of the closed housing 8 and an electric motor 4 is provided in the lower portion.
Are arranged, and these are interlockingly connected to each other by a rotary shaft 5. The scroll type compression mechanism C includes a fixed scroll 1, an orbiting scroll 2, an Oldham ring 3 which allows the orbiting orbiting motion of the orbiting scroll 2 but prevents its rotation, a frame 6 to which the fixed scroll 1 and the electric motor 4 are locked, and a rotation. An upper bearing 71 and a lower bearing 72, which support the shaft 5, an orbiting bearing 73 and a thrust bearing 74, which support the orbiting scroll 2, are provided.

The fixed scroll 1 comprises an end plate 11 and a spiral wrap 12 provided upright on the inner surface of the end plate 11. A discharge port 13 and a discharge valve 17 for opening and closing the discharge port 13 are provided at the center of the end plate 11. .. The orbiting scroll 2 is composed of an end plate 21, a spiral wrap 22 standing on the inner surface of the end plate 21, and a boss 23 projecting from the center of the outer surface of the end plate 11. A drive bush 54 is fitted in the boss 23. A rotary bearing 73 is rotatably supported. A slide groove 55 is formed in the drive bush 54, and an eccentric drive pin 53 protruding from the upper end surface of the rotary shaft 5 is slidably fitted in the slide groove 55. A balance weight 84 is fixed to the lower end portion of the drive bush 54 to balance the dynamic unbalance due to the orbiting movement of the orbiting scroll 2.

Lubricating oil 8 stored in the bottom of the housing 8
1 is sucked up from the inlet hole 51 by the centrifugal force generated by the rotation of the rotating shaft 5, passes through the oil supply hole 52, and is moved to the lower bearing 7.
2. After lubricating the upper bearing 71, the drive bush 54, etc., the oil is discharged to the bottom of the housing 8 through the balance weight chamber 61 and the oil drain hole 62. When the electric motor 4 is driven, this rotating torque is generated by the rotating shaft 5 and the eccentric drive pin 5.
3, the drive bush 54, and the orbiting bearing 73 are transmitted to the orbiting scroll 2, and the orbiting scroll 2 revolves around its axis while being prevented from rotating by the Oldham link 3. Then, the gas passes through the suction pipe 82 and the housing 8
After entering the inside and cooling the electric motor 4, the fixed scroll 1 and the orbiting scroll 2 are meshed with each other through the suction passage 15 through a suction cavity 16 formed around the spiral wraps 12 and 22 of both scrolls 1 and 2. The air is sucked into the plurality of closed spaces 24 limited by the above. The closed space 2 is formed by the orbiting motion of the orbiting scroll 2.
The discharge cavity 1 formed on the back side of the end plate 11 reaches the central portion while being compressed as the volume of 4 decreases and pushes up the discharge valve 17 from there through the discharge port 13.
4 is discharged into the second discharge cavity 19 through the hole 18 formed in the partition wall 31, and then discharged outside through the discharge pipe 83.

When the orbiting scroll 2 orbits, the orbiting scroll 2 is acted on by the centrifugal force in the eccentric direction and the gas force of the compressed gas in the closed space 24. The side surface of the wrap 22 is pushed toward the side surface of the wrap 12 of the fixed scroll 1 by being pushed in the direction in which the turning radius increases. The orbiting radius of the orbiting scroll 2 automatically changes as the side surface of the wrap 22 and the side surface of the lap 12 slide in close contact with each other, and the eccentric drive pin 53 causes the slide groove 55 to slide.
To move in the longitudinal direction.

[0006]

In the conventional scroll compressor described above, when the rotational speed of the rotary shaft 5 increases, the centrifugal force due to the rotation of the rotary shaft 5 increases, and the lubricating oil is sucked up from the inlet hole 51. The amount that can be used increases. As a result, the amount of lubricating oil that lubricates the lower bearing 72, the upper bearing 71, and the drive bush 73 increases, and a large amount of lubricating oil accumulates in the balance weight chamber 61.

The oil accumulated in the balance weight chamber 61 is
Although part of the lubricating oil is discharged to the bottom of the housing 8 through the oil drain hole 62, other lubricating oil slides between the thrust bearing 74 and the rear surface of the orbiting scroll end plate 21 as shown by the arrow in FIG. The fixed scroll 1 and the orbiting scroll end plate 21 pass through the moving surface.
It flows into the suction cavity 16 from the gap of the mating surface with. The lubricating oil that has flowed into the suction cavity 16 is discharged to the outside together with the compressed gas, and the amount of the lubricating oil 81 stored in the bottom portion of the housing 8 gradually decreases. As a result, poor lubrication or burning due to this is caused. There is a risk of accidents such as sticking.

The present invention solves the above-mentioned drawbacks of the prior art and prevents the inflow of lubricating oil into the suction cavity 16 so as to prevent the occurrence of insufficient lubricating oil and prevent accidents such as seizure.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and comprises at least a pair of a fixed scroll and an orbiting scroll which are out of phase with each other and meshed with each other, and an end of the orbiting scroll. In a hermetic scroll compressor in which a plate back surface is supported by a frame via a thrust bearing, and an oil sump portion is formed on an inner peripheral side of the thrust bearing on the end plate rear surface side of the orbiting scroll, Sealing characterized in that a ring-shaped groove is provided on the surface and an oil seal material is installed in the groove to block the flow of oil between the inner peripheral side and the outer peripheral side of at least one surface of the thrust bearing. Type scroll compressor.

[0010]

Since the present invention has the above-mentioned structure, the oil accumulated in the oil sump portion, that is, the balance weight chamber 61 in the prior art, is transferred to the suction cavity by the oil seal material installed in the thrust bearing. Leakage is prevented. Since the leaked oil will eventually be discharged, the above configuration prevents the reduction of the lubricating oil, and prevents the insufficient lubricating oil and the seizure accompanying it.

[0011]

1 is a perspective view of a thrust bearing and its periphery according to an embodiment of a hermetic scroll compressor of the present invention, and FIG. 2 is a partial sectional perspective view of the thrust bearing. In the figure, 74 is a thrust bearing, 77 is an oil seal groove provided in the thrust bearing, 75 is an oil seal material mounted in the groove, and 76 is an oil seal material.
Is a spring mounted in a hole provided at the bottom of the groove 77. A plurality of the springs are provided in the circular groove, whereby the oil seal material 75 is pressed against the back surface of the end plate 21 of the orbiting scroll. The parts other than the above are the same as in the prior art.

In such a structure, the oil accumulated in the balance weight chamber 61 is blocked by the oil seal member 75 pressed against the rear surface of the orbiting scroll by the spring 76, so that the oil passage to the suction cavity 16 side is blocked. Inflow of lubricating oil into the cavity is prevented. In such a structure, it is possible to prevent a decrease in the amount of oil stored in the inner bottom portion of the housing 8, and thus it is possible to prevent a decrease in the lubricating performance of the scroll compressor.

Since it is desirable that the pressing force of the sealing material 75 against the rear surface of the orbiting scroll end plate is small, the spring force and the number of the springs 76 are determined in consideration.
Further, the spring 76 may have a coil shape or a plate shape. The oil passage blocking structure described above is not limited to the rigid scroll compressor shown in the present embodiment, but may be applied to a horizontal scroll compressor.

[0014]

In the hermetic scroll compressor of the present invention, a ring-shaped groove is provided on the surface of the thrust bearing,
An oil seal material is installed in the groove to block the oil flow between the inner and outer circumferences of at least one surface of the thrust bearing. Can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view around a thrust bearing according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional perspective view of the thrust bearing of the same embodiment.

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

FIG. 4 is a cross-sectional view around a thrust bearing of a conventional scroll compressor.

[Explanation of symbols]

 1 Fixed Scroll 2 Orbiting Scroll 16 Suction Cavity 21 Orbiting Scroll End Plate 61 Balance Weight Chamber 74 Thrust Bearing 75 Oil Seal Material 76 Spring 77 Oil Seal Groove

Claims (1)

[Claims] 1. An orbiting scroll comprising at least a pair of fixed scrolls and orbiting scrolls that are out of phase with each other and meshed with each other. In a hermetic scroll compressor in which an oil sump is formed on the inner peripheral side of the thrust bearing on the back side of the end plate of, a ring-shaped groove is provided on the surface of the thrust bearing, and an oil seal material is provided in the groove. A hermetic scroll compressor, which is installed and blocks the flow of oil between the inner peripheral side and the outer peripheral side of at least one surface of the thrust bearing.