Compressor having a lubricant pick-up tube guard

Details Compressor having a lubricant pick-up tube guard Compressor having a lubricant pick-up tube guard

1998-06-17

2001-01-09

Vrablik, John J. (Department: 3748)

Rotary expansible chamber devices

Heat exchange or non-working fluid lubricating or sealing

Non-working fluid passage in inner working or reacting member

C184S006180, C184S006230

Reexamination Certificate

active

06171090

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to lubrication systems for hermetic compressors and in particular vertically oriented hermetic compressors having a pick-up tube or shaft end which extends into the oil contained in a sump.
Hermetic compressors having hollow shafts or pick-up tubes which extend into the oil contained in a sump are used for drawing lubricant from the sump and providing it to moving parts of the compressor assembly. Often these tubes or shafts are provided with a paddle for pumping the oil through the shaft or tube. A problem experienced with pick-up tubes or shafts is that on their rotation they tend to create vortices around the end of the shaft or tube which extends into the oil. These vortices hinder the performance of oil delivery into the tube or shaft. A way of preventing the formation of these vortices is desirable.
SUMMARY OF THE INVENTION
The present invention provides an oil inlet guard disposed about the end of a rotating oil pickup tube or shaft provided with an oil passage opening. The guard is fixed such that it does not rotate and is provided with a central oil aperture through which oil flows from the sump into the rotating shaft or pick-up tube. The guard smooths the oil which flows into the pickup tube or shaft, eliminating flow-disrupting vortices and increasing the oil pick-up performance of the shaft or tube.
The present invention provides a compressor assembly including a housing having an oil sump in which is contained a liquid lubricant, a compressor mechanism disposed within the housing, a vertical, rotatable shaft associated with the compressor mechanism and provided with a conduit having an downwardly directed open end which extends beneath the surface level of the lubricant in the sump and through which oil is conveyed to the compressor mechanism, and a guard in surrounding relationship with the conduit open end and having an aperture disposed beneath and proximal to it, the guard fixed relative to the housing, the sump in fluid communication with the conduit through the guard aperture.


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