Slurry pump with discharge cylinders, especially two-cylinder co

Details Slurry pump with discharge cylinders, especially two-cylinder co Slurry pump with discharge cylinders, especially two-cylinder co

1993-03-19

1994-05-31

Bertsch, Richard A.

Pumps

Expansible chamber type

Mechanically actuated distributor

417900, 417519, F04B 700, F04B 1502

Patent

active

053164539

ABSTRACT:
A slurry pump for mixing concrete includes a charge funnel, a pair of discharge cylinders, and a discharge line operable with each other to form a slurry flow control. A control valve has an exit port connected with the discharge line and an entrance port that is alternatively positioned in front of an opening of each discharge cylinder. A pair of gate valve disks are positioned one on each side of the entrance port. The size of each gate valve disk conforms to a surface between the discharge cylinder openings such that in a change-over midpoint of the control valve the openings of the discharge cylinders are sealed off by the gate valve disks, and the entrance port and the control valve is sealed off on the surface between the discharge cylinders for the execution of a partial stroke a discharge cylinder piston which compresses the drawn in slurry. A compensation cylinder prevents slurry interruptions during the change-over the control valve. A combinatorial circuit controls the drive of each discharge cylinder and the slurry flows such that during the change over of the control valve the compensation cylinder pushes slurry into the discharge line and such that during a subsequent discharge cycle of one of the discharge cylinders the compensation cylinder is filled with slurry. A combinatorial circuit lets the drive of the discharge cylinder actually delivering slurry deliver faster in proportion to the amount of the slurry taken in by the compensation cylinder. The combinatorial circuit delays the change over of the control valve such that one of the gate valve disks closes off the opening of the discharge cylinder associated with it.

REFERENCES:
patent: 2033338 (1936-03-01), Kirby
patent: 3298322 (1967-01-01), Sherrod
patent: 3663129 (1972-05-01), Antosh
patent: 3667869 (1972-06-01), Schlecht
patent: 3963385 (1976-06-01), Caban
patent: 4343598 (1982-08-01), Schwing et al.
patent: 4345883 (1982-08-01), Westerlund et al.
patent: 5257912 (1993-11-01), Oakley

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