Pumps – Motor driven – Interrelated or common lubricating or cooling means for pump...
Patent
1984-11-30
1989-04-04
Smith, Leonard E.
Pumps
Motor driven
Interrelated or common lubricating or cooling means for pump...
417400, 92144, F04B 2100
Patent
active
048181927
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a reciprocating pump whose plunger is connected with a plunger rod which runs in a stuffing box coordinated with the pump cylinder cap and is hydraulically reciprocated, where the cylindrical walls of the pump cylinder are provided, over their entire length, with flow-through openings for a cooling medium passing through them, and the flow-through openings in the cylindrical walls of the pump cylinder are connected to a coolant circuit.
A problem associated with that type of reciprocating pumps is making them safe to run dry. Dry running of the pump involves the danger that the packings in the area of the plunger and stuffing box will overheat and burn, especially when relatively high sealing pressures are required.
Known from the U.S. Pat. No. 2,751,144 is a gas compression apparatus which, as a reciprocating compressor with piston rings, is driven hydraulically. For continuous dissipation of the compression heat of the gas, the hydraulic fluid, after passing through the hydraulic drive, proceeds through the compressor housing, which is provided with cooling chambers. The problem of temporary dry running does not occur with such a gas compressor.
Previously known from the Belgian patent document No. 423 910 is a mechanically driven reciprocating gas compressor which has a dual-stage design and is double-acting in the first stage. The heat generated through the gas compression is dissipated through hollow spaces in the cylinder, piston, and the hollow piston rod by a cooling medium flowing through these. Concerned here, too, is a gas compressor with piston rings where the problem of a temporary dry running is nonexistent.
Since reciprocating fluid pumps require generally no cooling, no teaching transferable to the problem underlying the invention can be derived from the above state of the art.
Deriving from the German patent publication No. 23 34 245 is a power water generator with commercial grade seals for its hydraulic drive. This power water generator features neither stuffing box packings nor is it suited for pumping fluids which contain solids.
Therefore, the problem underlying the invention is advancing the reciprocating pump of the initially mentioned type, with stuffing boxes, to the effect that in pumping solid-laden fluids it will be safe to run dry over long periods of time, without permitting hydraulic fluid to proceed into the pump cylinder.
Basing on a plunger rod of the initially mentioned type, the invention suggests to solve the problem by sealing the plunger against the pump cylinder with the aid of packings, providing the rod with flow-through openings for a medium to pass through, connecting the flow-through openings in the rod to a common hydraulic circuit, and using the hydraulic medium likewise as cooling medium.
The inventionally suggested cooling of the plunger rod and cylindrical walls of the pump cylinder results in a continuous direct cooling of the packing sealing faces which are in contact with the plunger rod and/or the cylindrical walls of the pump cylinder, so that the packing material cannot burn even when the pump runs dry. The coolant in the flow-through openings being encapsulated relative to the interior of the pump cylinder, no coolant can proceed into said interior. Being good heat conductors, the metallic walls between the friction faces and the coolant can dissipate the heat generated by dry running of the reciprocating pump considerably faster than can the poorly heat-conductive packing material.
Moreover, special advantages result from the fact that a separate coolant circuit is no longer necessary. In this case present anyway, the hydraulic circuit is rather used for cooling.
The flow-through openings in the plunger rod and the cylindrical walls of the pump cylinder are suitably connected to a common coolant circuit. Thus it is possible to favorably make do with only one coolant circuit.
Particular advantages result when the reciprocating pump is driven by a hydraulic cylinder and the hydraulic working medium for the drive cylinder is lik
REFERENCES:
patent: 129631 (1872-07-01), Waring
patent: 255116 (1882-03-01), Rand
patent: 363453 (1887-05-01), Ford
patent: 1647425 (1927-11-01), Wise
patent: 1689049 (1928-10-01), Prosser
patent: 2751144 (1956-06-01), Troendle
patent: 3248023 (1966-04-01), Dienenthal
patent: 3913460 (1975-10-01), Wright
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