JPH0242192A - Rotary hermetic compressor - Google Patents

Abstract

PURPOSE:To improve the lubricating property immediately after a start by providing an oil sump section at the middle section between horizontal holes provided on a shaft and the lower end of the shaft in a compressor feeding the refrigerator oil to sliding sections from a vertical hole through the horizontal holes by the rotation of the shaft extended in the vertical direction. CONSTITUTION:A shaft 5 transmitting the power of a motor-driven element 2 provided at the upper section to a compressing element 3 sucks the refrigerator oil 4 in a vertical hole 10 by its rotation and feeds it to sliding faces of upper and lower bearings 8 and 9 through horizontal holes 11-13. In this case, a horizontal hole 15 is formed at the position corresponding to the upper end of the upper bearing 8 of the shaft 5. An oil feeder 16 is formed at the portion of the vertical hole 10 between the horizontal hole 15 and the lower end section of the shaft 5. This oil feeder 16 has a pipe with a through hole at the center, an oil reservoir section 17 is formed on its upper face. The excess oil sucked by the rotation of the shaft 5 is stored in this reservoir section 17, the stored oil is lifted by the centrifugal force at the time of the next start and fed to the upper bearing 8 through the horizontal hole 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a rotary hermetic compressor, and particularly to a rotary hermetic compressor suitable for lubricating sliding parts.

[Background of the invention]

The oil supply structure of a conventional rotary hermetic compressor will be explained with reference to FIG. An electric element is arranged in the upper part of the closed container 1, a compression element - nose is arranged in the lower part, refrigeration oil 4 is stored in the bottom part, and an eccentric part of the shaft 5 that constitutes the compression element 3 (
(not shown) is rotatably fitted into the roller 6.
rotates within a cylinder chamber composed of a cylinder 7, an upper bearing 8, and a lower bearing 9, and sucks and compresses refrigerant gas from a suction pipe (not shown). The shaft 5 has a vertical hole 10.

The lower end is immersed in refrigerating machine oil 4, and when the shaft 5 rotates, the refrigerating machine oil 4 rises in the vertical hole 10 and is supplied to the sliding surface through horizontal holes 11, 12, 13 made in the shaft 5.

Oil is supplied to the upper bearing 8 from the side hole 13, ascends through an oil groove (not shown) provided on the inner surface of the upper bearing 8 or the surface of the shaft 5, and is supplied to the entire sliding surface of the upper bearing 8.

However, with such a structure, it takes time for the refrigerating machine oil 4 to reach the upper end of the upper bearing 8.

Immediately after the start of operation, the shirt 5 may rotate while making metal contact with the upper bearing 8 without refrigerating machine oil 4.
This may lead to abnormal wear and galling.

For example, Jitsuma No. 60-24892 is related to this rotary hermetic compressor.

[Purpose of the invention]

The object of the present invention is to provide a rotary hermetic compressor that can supply the amount of oil necessary to form an oil film on the upper part of the upper bearing for several seconds immediately after startup, and can prevent abnormal wear and galling due to metal contact between the upper bearing and the shaft. Our goal is to provide the following.

[Summary of the invention]

The above-mentioned problem occurs for 1 to 2 seconds until the refrigerating machine oil reaches the upper end of the upper bearing immediately after startup, and thereafter it does not cause any trouble because the refrigerating machine oil is continuously supplied. Therefore, it is only necessary to supply a small amount of refrigerating machine oil to the upper end of the upper bearing immediately after startup to compensate for the time until the refrigerating machine oil arrives from below. Based on this idea, the present invention has devised a fuel supply structure suitable for this supply.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. 1st
@ is a vertical cross section of a rotary hermetic compressor. In the figure, a horizontal hole 15 is provided at a position corresponding to the upper end of the upper bearing 8 of the shaft 5, and the vertical hole 10 and the surface of the shaft 5 communicate with each other. An oil supply device 16, that is, an oil reservoir portion is locked in the vertical hole 10. The oiler 16 has a pipe with a through hole in the center, and an oil reservoir 17 is formed between the upper surface of the oiler 16 and the inner wall of the vertical hole 1o.
to chew. When the shaft 5 rotates, the refrigerating machine oil 4 rises through the vertical hole 10 and is supplied to the sliding parts through the horizontal holes 11, 12, and 13, and the remaining refrigerating machine oil 4 blows up through the through hole in the center of the oiler 16 and flows into the oiler. The excess amount accumulates on the upper surface of the upper bearing 8 and is supplied to the upper part of the upper bearing 8 through the side hole 15. When the shaft 5 stops rotating, refrigeration oil 4 is accumulated from the height of the side hole 15 to the upper surface of the oil supply device 16. At the next startup, the refrigerating machine oil 4 stored on the upper surface of the oil supply device 16 is pressed against the inner wall of the vertical hole 10 by centrifugal force and is immediately supplied to the upper end of the upper bearing 8 through the horizontal hole 15. Therefore, since the stored refrigerating machine oil 4 is always supplied for the second and subsequent startups, the shaft 5 and the upper part of the upper bearing 8 will not come into contact with metal chips. The first startup can be handled by lubricating the compressor when assembling it.

Even if there is no oiler 16 and only the side hole 15, the refrigeration oil 4 is supplied to the side hole 1.
5, but it takes time to reach the height, and the oil film that is formed is so thin that the amount of oil supplied is extremely small, making it useless as a countermeasure.

FIG. 2 shows another embodiment. FIG. 2 is a longitudinal sectional view of the rotary hermetic compressor. In the figure, the oil supply device 16 is formed integrally with the shaft 5. This oiler 1
A through hole is provided in the center of 6.

It goes without saying that such other embodiments have the same effects as the embodiment shown in FIG. 1 above.

〔Effect of the invention〕

According to the present invention, the amount of oil required to form an oil film on the upper part of the upper bearing for several seconds after startup can be supplied immediately after startup.
This has the effect of preventing the shaft from coming into metal contact with the upper part of the upper bearing and causing galling due to abnormal wear, thereby improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a rotary hermetic compressor to which one embodiment of the present invention is applied, FIG. 2 is a vertical cross-sectional view of a rotary hermetic compressor explaining another embodiment, and FIG. FIG. 2 is a vertical cross-sectional view of a conventional rotary hermetic compressor. DESCRIPTION OF SYMBOLS 1... Airtight container, 2-... Electric element, 3-... Compression element, 4... Refrigeration oil, 5... Shaft, 6...
Roller, 7... Cylinder, 8... Upper bearing, 9...
・Lower bearing, 10...Vertical hole, 11.12.13.15
...Side hole, 16...Oil supply device, 17...Storage part. +2 Graduation ■ ■ $2 figure

Claims (1)

[Claims] 1. An electric element is disposed in the upper part of a closed container, and a compression element is disposed in the lower part, refrigeration oil is stored in the bottom part, and a shaft is provided to connect the electric element and the compression element, and the shaft has a vertical hole. In a rotary hermetic compressor, the lower end of the shaft is immersed in stored refrigerating machine oil, and as the shaft rotates, the refrigerating machine oil is supplied from the inner hole of the shaft to the sliding part through the horizontal hole. A rotary hermetic compressor, characterized in that a lateral hole is provided to connect the lateral holes, and an oil reservoir is provided in an intermediate portion between the lateral hole and the lower end of the shaft.