Dual labyrinth fluid seal with fluid slinger

Details Dual labyrinth fluid seal with fluid slinger Dual labyrinth fluid seal with fluid slinger

1982-12-10

1985-07-30

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 59, 277 68, 277 74, 277203, F16J 1542, F16J 1544

Patent

active

045317461

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
This invention relates generally to a fluid seal device and more particularly to a plurality of non-contacting fluid seals located within the operative interface between a stationary member and a rotating member.
2. Background Art
The fluid within a fluid chamber such as, the pan of an engine or compressor is used for lubrication and cooling. The fluid is distributed by a pump through passages within the block to lubricate and cool the crankshaft, pistons, connecting rods, camshaft and other moving parts. Some systems also use a splash lubrication system. In either of these systems the fluid after it lubricating and cooling drains back into the pan. During the draining of the fluid, the crankshaft strikes the fluid. The striking of the fluid agitates, splashes and throws the fluid against the interior walls of the pan and block. The fluid tends to leak out of the fluid chamber should a leakage path exist. The primary path of leakage will be at the operative interface between the crankshaft and the block of the engine or compressor. This path of operative interface must be sealed to prevent the loss of fluid from the fluid chamber.
The sealing member of a conventional fluid seal device is normally a contacting seal. The seal is located in the operative interface between a stationary member and a rotating member. Such seals are maintained in frictional engagement with the rotating member. This results in wear to the seal thereby reducing its life expectancy.
Other conventional fluid seal devices employ a non-contacting seal in an attempt to increase the life expectancy of the sealing device. For example, labyrinth seals have been used within the interface between a stationary member and a rotating member for preventing leakage from a fluid reservoir. To be more effective, many labyrinth seals employ a fluid introduced at an intermediate location within the sealing member to help prevent leakage from the fluid chamber. The leakage from the fluid chamber still tends to exist.
Another non-contacting seal device well known in the art is the fluid slinger. Such slingers act as sealing devices by utilizing centrifugal force to prevent a fluid from leaking from a fluid chamber. Slingers have been used both between the fluid chamber and the leak path as well as between the atmosphere and the leak path. The purpose of the slinger in the latter example is to prevent dirt and other contaminates from entering the fluid chamber. Leakage from the fluid chamber past the slingers still exist.
Another type of non-contacting fluid sealing device is the spiral groove or oil return grooves used in conjunction with an oil seal contacting the rotating member and the stationary member chamber.
The conventional fluid seals as identified above all have short comings. The single non-contacting seal device does not positively prevent leakage of fluid therethrough while the combination of non-contacting and contacting seals does not provide the life expectancy of long-life seal devices.
The present invention is directed to overcoming one or more of the problems as set forth above.


DISCLOSURE OF THE INVENTION

In one aspect of the present invention, a sealing device for preventing leakage of a fluid from a fluid chamber through a path of operative interface disposed between a stationary member and a rotatable member located above the level of fluid in the fluid chamber comprises a first non-contacting seal and a second non-contacting seal disposed at the operative interface. The second non-contacting seal is adjacent and in serial relation to the first non-contacting seal. The first non-contacting seal is located between the fluid chamber and the second non-contacting seal.
In another aspect of the present invention a sealing device is disclosed containing a third non-contacting seal disposed at the operative interface and located between the fluid chamber and the first non-contacting seal.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a partial sectional view of an embodiment of the present invention;

REFERENCES:
patent: 978399 (1910-12-01), Rotter
patent: 1505647 (1924-08-01), Junggren
patent: 1558630 (1925-10-01), Reed
patent: 1720696 (1929-07-01), Simpson
patent: 2526594 (1947-10-01), Voysey
patent: 2631071 (1948-05-01), Alden
patent: 3468548 (1969-09-01), Webb
patent: 3545570 (1970-12-01), Schrader
patent: 3724861 (1973-04-01), Lesiecki
patent: 4273343 (1981-06-01), Visser
patent: 4314705 (1982-02-01), Shimizu
patent: 4368895 (1983-01-01), Okamoto et al.

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