Pumps – Expansible chamber type – Including valve assembly – disassembly – or inspection...
Patent
1984-11-30
1987-05-12
Croyle, Carlton R.
Pumps
Expansible chamber type
Including valve assembly, disassembly, or inspection...
417537, 417566, F04B 2102
Patent
active
046646060
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a reciprocating pump for fluids, specifically such contaminated by solids, comprising a plunger reciprocating in a pump cylinder to the interior of which there are connected, through the intermediary of check valves working in opposite directions, an intake chamber featuring the intake socket of the reciprocating pump and a pressure chamber featuring the pressure socket of the reciprocating pump.
On state of the art reciprocating pumps of that type the pressure chamber is normally arranged above the pump cylinder. Specifically the check valves (pressure valves) coordinated with the pressure chamber are always arranged at the highest point of the interior space. Besides, the pressure socket on the pressure chamber empties mostly above the pump cylinder. This was heretofore considered mandatory, since it makes it possible to prevent air bubbles to remain behind in the interior of the pump. For the air bubbles stemming from the liquid intake or from direct intake cannot accumulate in the pump housing, but are removed instead through the elevated pressure valves. This is to counteract the danger that the reciprocating pump will compress the air that has been sucked in, and not do any pumping work.
A drawback of the prior reciprocating pumps of said type is constituted by the fact that they clog relatively easily through solids carried by the fluid being pumped. This is particularly disadvantageous when contaminated substances, e.g., waste water at construction sites or similar, are to be pumped. The solid particles proceed with the intake flow relatively easily through the intake valves and remain then in the space between the intake valves and the pressure valves, since they are unable to follow the steeply rising pump flow. This is true especially for solid particles having a greater specific gravity than the substance being pumped, for instance rocks, sand or similar. Therefore, separators for rocks or other coarse dirt particles are usually installed in the intake line of reciprocating pumps of said type. But such rock separators clog easily, for instance through leaves or similar floating in the waste water, and are unable to retain small rocks or solid particles, which as well may clog the pump. In contrast, it would be better to make the reciprocating pump self-cleaning, precluding clogging by entrained solid particles.
Therefore, the problem underlying the invention is advancing the reciprocating pump of the initially named type to the effect that solid particles carried by the substance being pumped, and which have passed the intake valve, will be safely removed from the pump through the pressure valves, the pressure chamber, and the pressure socket.
As a solution to the problem the invention suggests, basing on a reciprocating pump of the initially named type, that the intake chamber, pump cylinder, and the pressure chamber be arranged side by side in a horizontal or only slightly inclined plane, that the check valves be arranged side by side in the same horizontal or slightly inclined plane, and that the pressure socket empty on the underside of the pressure chamber.
On its way through the intake chamber to the intake valve, from the intake valve to the pump cylinder, from the pump cylinder to the pressure valve, and through the pressure chamber to the pressure socket, the pumped substance follows in the inventional reciprocating pump essentially horizontal or slightly rising paths, ensuring that the solid particles will continue to proceed along the bottom of the horizontal paths in a rolling or sliding fashion. Even if solid particles of especially heavy specific gravity should settle on the bottom of the pumping path, such will not affect the continued pumping ability and self-cleanability of the inventional reciprocating pump, since such deposits will constrict the pumping paths and thereby raise the flow velocity, so that at least the solid particles proceeding subsequently into the pump will be entrained along the horizontal pumping paths, thereby precluding a complete c
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Croyle Carlton R.
Neils Paul F.
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