Assemblies for modular fluid pump

Details Assemblies for modular fluid pump Assemblies for modular fluid pump

2000-05-30

2001-10-30

Vrablik, John J. (Department: 3748)

Rotary expansible chamber devices

With mechanical sealing

C418S206600, C418S206700

Reexamination Certificate

active

06309199

ABSTRACT:

This invention relates to pump assemblies and to apparatus for modular liquid pump assemblies and more particularly to pump assemblies for pumps adapted for pumping contaminated liquids.
BACKGROUND OF THE INVENTION
Fluid pumps adapted for use in pumping liquids and fluids, such as oils and distillates produced from oil wells, frequently contain entrained contaminating materials such as sand, grit and the like. The pumping of such fluids results in the entrained gritty materials that are found in the fluid to come into contact with the pump elements, in particular, the pump surface elements as well as the pump bearings and seals. Where large volumes of fluid are pumped or a pump is used frequently, such as to empty a holding tank near the well site, the pump mechanical elements are exposed routinely to the entrained gritty materials. Consequently, pumps in service for such tasks have a tendency to wear prematurely and fail after a short period of use, such as after a few months or less than one year.
In the past, modular pump assemblies have been proposed to provide double fluid seals such as that disclosed by Korenblit in Canadian patent 2,021,157 which provides tandem mounted face seals each having a different construction, that is a flexible seal and a non-flexible seal to improve seal performance. Another seal arrangement is shown by Ernens in published Canadian patent application 2,226,693. The seal arrangement of Ernens situates the seals between the pump rotor and bearings. A high pressure hydraulic system and pump including high pressure seals at both ends of the pump driven shaft to reduce or eliminate forces that might tend to increase friction and wear is disclosed in published Canadian patent application 2,246,100 by Tieben.
However, to improve the serviceability of pumps and the increase the operating life of pumps put to uses involving pumping fluids containing grit materials, such as pumping field holding tanks of oil wells and the like, other pump assemblies are needed than have heretofore been provided. It is an object of this invention to provide a apparatus for modular pumps that provides for ease of maintenance and parts replacement of pump parts to decrease the cost of pump maintenance and to improve the life expectancy of the pump assembly.
SUMMARY OF THE INVENTION
In one of its aspects, the invention provides apparatus for a modular pump assembly that includes easy accessibility to replaceable seals and bearings with modular end plate assemblies to allow servicing with a minimum of parts required to be replaced.
The pump is provided with a housing including multi-part removable end plates that facilitate access to pump seals and bearings as well as entry into the pump cavities to replace the pump elements. The multi-part removable end plates include removable bearing assemblies that permit the pump bearings to be accessed to replaced or the pump seals to be replaced without requiring disassembly of the entire pump housing and pump cavity assembly.
In one of its aspects, the invention provides modular pump apparatus for a modular fluid pump including a pair of end plates adapted to be removably sealingly attachable to a modular pump housing, each end-plate forming at least one shaft passage to receive a pump shaft therethrough. Each shaft passage in the endplate has a bearing mount provided on the outer side of the endplate for attachment of at least one bearing assembly, and a grit collar mount on the inner side of the endplate. The modular pump apparatus further includes at least one bearing assembly dimensioned to fit on to the bearing mount. The bearing mount forms a cavity to receive a pump shaft fitted with a shaft seal and a shaft bearing and means to releasably secure the bearing assembly to the endplate. A grit collar, adapted to receive a pump shaft therethrough, is mountable in the grit collar mount of the endplate.
Other aspects of the invention will appear from the following description and appended claims. The invention will now be explained with reference to the accompanying drawings in which like reference numerals have been used throughout the various figures of the drawings:


REFERENCES:
patent: 3059835 (1962-10-01), Hanley et al.
patent: 3392677 (1968-07-01), Kennedy
patent: 2021157 (1991-01-01), None
patent: 2226693 (1998-08-01), None
patent: 2246100 (1999-03-01), None
patent: 4024067 (1992-01-01), None
Roper Pumps, Bulletin 70-25, Series 3600-3700 4600-4700, Published Oct. 1987, U.S.A.

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