Piston pump for thick materials

F - Mech Eng,Light,Heat,Weapons – 04 – B

Patent

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Details

F04B 7/00 (2006.01) F04B 15/02 (2006.01)

Patent

CA 2557146

The invention relates to a multi-cylinder viscous matter piston pump (1), for transporting in particular concrete. Said pump comprises at least two transport cylinders (3, 5), which transport the viscous matter from a pre- filled container (7) into a transport conduit and a changeover valve (9) for the alternate connection of the transport cylinder to the transport conduit. Said valve comprises at least two rotatable valve bodies that have a respective conduit section (15L, 17L) between one of the respective transport cylinders and the transport conduit and that are connected downstream of the transport cylinder to a collecting tube (19). The inventive changeover valve (9) comprises at least, preferably two substantially rotational rotary valves (15, 17; 15', 17'; 15", 17"), each of which comprises a straight conduit section (15L, 17L) for connecting the associated transport cylinder (3, 5) to the transport conduit and at least one section that blocks said connection. The invention also relates to a method for operating said viscous matter pump in a continuous transport mode.

L'invention concerne une pompe à liquides épais polycylindrique (1) servant à transporter en particulier du béton. La pompe selon l'invention comprend au moins deux cylindres de transport (3, 5) qui transportent les liquides épais d'un récipient pré-rempli (7) vers une conduite de transport, et une soupape d'inversion (9) servant à raccorder de manière alternée les cylindres de transport avec la conduite de transport. Cette soupape d'inversion comprend au moins deux corps de soupape rotatifs qui comportent respectivement une section de conduite (15L, 17L) entre respectivement un des cylindres de transport et la conduite de transport, et qui sont raccordés à un tuyau collecteur (19) en aval des cylindres de transport. Cette invention est caractérisée en ce que la soupape d'inversion (9) comprend au moins, de préférence deux tiroirs rotatifs (15, 17 ; 15', 17' ; 15'', 17'') qui peuvent être déplacés de manière sensiblement rotative et qui comprennent respectivement une section de conduite rectiligne (15L, 17L) servant à relier le cylindre de transport (3, 5) associé avec la conduite de transport, et au moins une section qui empêche ledit raccordement. Cette invention concerne également un procédé pour faire fonctionner la pompe à liquides épais en mode transport continu.

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