Pumps – Expansible chamber type – Plural pumping chambers
Patent
1989-03-06
1991-10-29
Smith, Leonard E.
Pumps
Expansible chamber type
Plural pumping chambers
417519, 417900, F04B 3910
Patent
active
050611585
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a multi-cylinder piston pump of the rotary slide valve type for conveying flowable material, particularly concrete.
The multi-cylinder piston pumps that are at the present time used in practice for concrete conveyance are described in an article in "Baumaschinen+Bautechnik", issue No. 2 of February, 1985, by Dipl.-Engineer Alfred Prawit, of Essen, under the title "Analyse der Betonschie-bersysteme" [Analysis of Concrete Pusher Systems]. In this article the advantages and disadvantages of current commercially available concrete pusher systems are explained.
SUMMARY OF THE INVENTION
The present invention has for its object to provide a multi-cylinder piston pump that is more simple in construction and is therefore more functionally reliable in operation than known types and is, in addition, more modest in its requirements for maintenance.
A multi-cylinder piston pump of this type is distinguished by the claimed features.
BRIEF DESCRIPTION OF THE DRAWINGS
An exemplary embodiment of a multi-cylinder piston pump of this type is explained with reference to the drawings, wherein:
FIG. 1 is a side view of a multi-cylinder piston pump with diesel engine, hydraulic pump and understructure, for conveying concrete and the like;
FIG. 1A is a rear view of the multi-cylinder piston pump of FIG. 1
FIG. 2 is a side view, partly in section, of the pumping portion of the multi-cylinder piston pump of FIG. 1;
FIG. 3 is a section on the section line III--III of the pump according to FIG. 2, in one end position of the slider;
FIG. 4 is a section similar to FIG. 3, with the pump in the other end position of the slider; and
FIG. 5 is a view in elevation from the front side of the multi-cylinder pump according to FIG. 1.
A PREFERRED EMBODIMENT
FIG. 1 shows a multi-cylinder piston pump 1 for wet spraying, which can also be designated for conveying caulking, and which particularly serves for delivery of concrete. A complete installation of this type comprises a portable mixer for delivering the material, a concrete pump 3, a dosing pump for blending medium, as well as a nozzle including mixing unit for the addition of pressure air and blending medium as well as a compressor for providing the pressure air.
In the foIlowing there is described only the pump 3 itself. It comprises a hopper 4 for receiving the pumpable concrete mixture, with an agitator 5 having mixing elements 8 formed as arms that are arranged in pairs on a driven shaft 6. (FIGS. 2 to 4.) The hopper 4 is formed at its lower end to an inwardly extending side portion 9 of the hopper bottom, while the connecting hopper bottom middle portion 10 has the form of a trough. This form assures minimum dead space with a minimum residue of concrete at the end of an operation.
To a front closure wall 12 of the hopper 4 there is fastened a pressure pipe carrier 13 which surrounds a cylindrical outer pipe 14, a closure cover 15 and a reinforcement 16. The main portion of this pressure pipe carrier 13 forms a pressure pipe 18 tapering conically in the conveying direction that terminates in a connecting flange 19 and serves for the connection of the spray apparatus itself by means of a more or less elongated feed pipe. This pressure pipe carrier 13 further comprises, at the side opposite the flange 19, an inner end flange 20 which is provided with a circumferential shoulder 21 for receiving the inner end of the cylindrical outer pipe 14. This structural unit of the pressure pipe carrier 13 rests with its inner end flange 20 in a counterflange (cutting ring) 23 with which a sealing ring 24 serves for sealing off and retightening of this transfer location.
As FIG. 5 shows, the closure cover 15 of the pressure pipe carrier 13 is secured by means of two lateral tension screws 54. At the bottom of the closure cover 15 there is provided a trunnion 55 that serves for mounting a swinging arm 58 which has its other end journaled on a chassis trunnion 57. This simple construction makes it possible, after loosening of the two
REFERENCES:
patent: 4036564 (1977-07-01), Richards
patent: 4174788 (1979-11-01), Casagrande
Aliva Aktiengesellschaft
Freay Charles
Smith Leonard E.
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