Pumps – Expansible chamber type – Having pumping chamber pressure responsive distributor
Patent
1993-01-13
1994-08-23
Bertsch, Richard A.
Pumps
Expansible chamber type
Having pumping chamber pressure responsive distributor
417900, 137515, 137849, 251212, F04B 1502, F04B 2102
Patent
active
053402910
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
An apparatus for conveying thick matter, mud, and bulk material of that kind, comprising a thick matter pump, which works preferably with an oscillating motion, a delivery line which is attached to the thick matter pump on the delivery side, and a restraining member, which is arranged in the delivery line and clears the passage, allowing the bulk material to pass through in the delivery line, and blocks it at least partially in the opposite direction.
In an already generally known apparatus of this type, a hydraulically actuated valve plate controlled by the piston travel is arranged at the outlet port of a thick matter pump designed as a single-piston pump. The valve plate releases the outlet port during the piston's pressure stroke and seals it during the suction stroke, so that the bulk material is prevented from flowing back. Apparatuses of this type require a relatively costly control system. Moreover, the service life of the valve plate is inadequate, because the abrasive bulk material subjects the moving slide parts to a considerable amount of wear.
The invention starts from here and is directed to improving the apparatus of the type indicated at the outset in a way that will allow the restraining member to work without controlling means and substantially free of wear.
SUMMARY OF THE INVENTION
The thought underlying the invention is that a restraining member having a pass-through opening, which expands elastically under the action of the bulk material flowing in the direction of output flow and which automatically narrows or contracts when the flow of the bulk material stops or when it is directed contrary to the direction of output flow, is hardly susceptible to wear and, moreover, makes do without a controlling means.
In the case of round delivery-line cross-sections, the pass-through opening of the restraining member is advantageously formed by a central opening and by several slit-type openings which extend from the central opening in a star shape or radial arrangement contrary to the direction of output flow up to the inner surface of the delivery line. On the other hand, in the case of rectangular delivery-line cross-sections, the pass-through opening of the restraining member can be made up of one gap-type opening and several slit-type openings, which extend essentially parallel from the gap-type opening, diagonally opposite the direction of output flow, up to the inner surface of the delivery line. While in the first case, the restraining member is effectively comprised of several spring-elastic finger lamellae, which are arranged at angular distances from one another in a star shape and form the boundary of the pass-through opening, and are inserted on one side in the area of the inner surface of the delivery line, and extend with their unattached ends diagonally in the direction of output flow toward the inside of the delivery line, in the case of rectangular delivery-line cross-sections, finger lamellae of the mentioned type are provided, which are preferably arranged at a lateral distance from one another and parallel to one another.
A preferred refinement of the invention provides that the unattached ends of the finger lamellae are able to bend up toward the inner wall of the delivery line under the action of the bulk material flowing in the direction of output flow, while widening the pass-through opening, and that the bent-up, unattached ends of the finger lamellae are able to bend back automatically into their blocking position when the flow of bulk material stops or is directed contrary to the direction of output flow, while narrowing the passthrough opening.
The finger lamellae expediently consist of a flat material of spring steel, which is concavely bent as viewed in the upstream side of the restraining member bent in the direction of output flow toward the =central opening, or of a spring-elastic plastic. One can avoid overlappings at the unattached ends, or rather too wide slit-type openings in the area of the inserted ends of the finger lamellae
REFERENCES:
patent: 2897835 (1959-08-01), Philippe
patent: 3058430 (1962-10-01), Handl
patent: 3174434 (1965-03-01), Schieve
patent: 3199457 (1965-08-01), Smart
patent: 3749521 (1973-07-01), Coone
patent: 3895646 (1975-07-01), Howat
patent: 4067540 (1978-01-01), Slade
patent: 4465102 (1984-08-01), Rupp
Benckert Hartmut
Hurr Helmut
Bertsch Richard A.
McAndrews, Jr. Roland G.
Putzmeister-Werk Maschinenfabrik GmbH
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