Pumps – Motor driven – Fluid motor
Patent
1999-06-01
2000-09-12
Freay, Charles G.
Pumps
Motor driven
Fluid motor
417900, 92128, F04B 1700, F04B 1502
Patent
active
061168653
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a piston pump for thick matter with at least a hydraulic operated pump cylinder, of which the pump piston is connected to the piston of a hydraulic drive cylinder by a common piston rod, and with a water box situated between the pump cylinder and the drive cylinder, through which the piston rod passes and which has a service opening at the top and accessible from above and a water outlet nozzle located at the bottom end.
2. Description of the Related Art
Piston pumps of this type are employed for transporting thick matter such as concrete, sewage sludge, excavated tunnel material and like. The water box is associated above all with a cleaning function: the common piston rod extending through the water box is freed or kept free of impurities from the area of the pump cylinder, in order to prevent contamination of the hydraulic fluids. In addition, the water box is associated with an important assembly and maintenance function: the pumping pistons which are exposed to a more or less greater abrasion, depending upon the abrasives of the media being conveyed, must be changed out at predetermined time intervals. They are thus releasably connected to the piston rod. The assembly occurs within the water box through the service opening at the top end. As inherently necessary for construction, the water box is located in the central area of a movable or stationary pump base, in which also other elements or aggregates of the pump assembly are located. The space available above the water box is thus most often very narrow, so that the access opening and the inside of the water box are only accessible from the outside with difficulty. The assembly of the pumping piston is further complicated thereby, that the pumping piston which is to be positioned in a defined mounting position has a high weight and the fasteners, such as screws and nuts, are to be assembled at positions not visible from the outside. It occasionally happens that during the assembly process a screw or a nut falls to the bottom of the water box and must be search for blindly and with great difficulty.
SUMMARY OF THE INVENTION
Beginning therewith, the invention is concerned with the task of improving the known piston pumps of the above-described type in such a manner, that a simplification of piston assembly and maintenance becomes possible.
The inventive solution is based on the concept, that the assembly of the piston can be greatly simplified by providing a two-sided access to the water box. In order to achieve this, it is proposed in accordance with the invention that the water box is provided at its bottom side with a removable floor plate forming an access opening which can be closed to form a fluid-tight seal.
In order to accommodate without twist or torsion the forces occurring in the water box during pumping, it is proposed, in accordance with a preferred embodiment of the invention, that the floor-sided service opening is bordered by a circumscribing, downwards-directed flange, on which the floor plate is secured fluid-tight. A further improvement in this respect can be achieved thereby, that the floor plate form-fittingly engages in an edge-open recess of the water box. For this the floor plate preferably exhibits an appropriate circumscribing edge which engages form-fittingly in a complementary flange recess or rib. Between the flange and the floor plate an appropriate circumscribing sealing ring is introduced for improved sealing.
A further advantageous design of the invention takes into consideration that an outlet pipe is provided on the floor plate and extending beyond the outer, downwards-facing broadside surface thereof. It is advantageously attached centrally in the floor plate via a 90.degree.-bent pipe and with its free end is essentially parallel to the broadside surface and extending towards outside beyond one of the side edges of the floor plate, so that it can be releasably hung on to a preferably hook-shaped holder which is fixed to the base. When
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patent: 4893992 (1990-01-01), Schlecht
patent: 5180294 (1993-01-01), Watchorn
patent: 5332366 (1994-07-01), Anderson
Fischer Gerald
Unger Gotthardt
Evora Robert Z.
Freay Charles G.
Putzmeister Aktiengesellschaft
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