Pumps – Expansible chamber type – Mechanically actuated distributor
Patent
1980-10-01
1983-05-10
Gluck, Richard E.
Pumps
Expansible chamber type
Mechanically actuated distributor
417519, 427532, 427900, F04B 1502
Patent
active
043827527
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNOLOGY
The invention relates to a pump with two cylinders, arranged parallel to each other and opening into a hopper, particularly for the delivery of viscous substances such as, for example, concrete. A S-shaped swivel tube is arranged within the hopper, swingingly mounted in the hopper with its end facing the feed cylinders swiveling alternately in line with one and then the other feed cylinders and tube sealingly abuts the rear wall of the hopper by means of a wear ring.
In pumps of this type, the material to be forwarded is drawn into one feed cylinder from the hopper during the return stroke of the piston in this cylinder, while with the simultaneous forward stroke of the piston in the other feed cylinder, the material to be forwarded, drawn into this cylinder beforehand, is pressed through the swivel tube into the delivery line connected to the tube.
In the construction of these pumps care must be taken that the wear ring, during each compression stroke of one of the feed cylinders, is closely adjacent the rear wall of the hopper or a spacer consisting of wear-resistant material covering the rear wall, to prevent liquid and also finely grained components of the material to be forwarded from issuing from this material at this location such issuance leads to increased wear of the parts moving against one another and, in the case of concrete, causes the concrete to weaken. It has been determined, during the very high pressure action, by which, for example, concrete is pressed through the swivel tube, that this tube is lifted from the rear wall of the hopper or from the spacer attached to this rear wall and is also subject to elastic deformation.
Prior Art
In order to avoid these disadvantages it has already been proposed (German Offenlegungsschrift No. 24 44 464) to reinforce the swivel tube drive by suitable dimensioning of the feed shaft and of the rocking lever acting upon the end of the swivel tube, or to construct the swivel tube drive in such a way, that its parts not only act upon the end facing the feed cylinders, but also upon the end at the mounting, whereby elastic deformation of the swivel tube is opposed simultaneously. To avoid the formation of a slit at the cylinder end of the swivel tube, which could not be prevented despite the above measures, it is proposed further, to make the spacer, arranged at the rear wall of the hopper, adjustable with respect to the rear wall.
A reliable seal should be achieved according to a further proposal (German Offenlegungsschrift No. 26 32 816), in that the wear ring is mounted on an additional locating means movable and preferably swiveling with respect to the end of the swivel tube, and in this way to oppose non-uniform wear of the wear ring, which is caused in that the areas of the wear ring nearer to the swivel axis of the swivel tube are subjected to less wear than the areas further away, which sweep a larger surface of the rear wall of the hopper or its spacer during one swivel movement.
These apparatus, however, do require relatively expensive constructions, which have the disadvantage that the exchange of parts subjected to wear gives problems and that the objective is not attained satisfactorily, particularly at the very high pressures encountered in the swivel tube.
DISCLOSURE OF THE INVENTION
The invention, therefore, has the object to ensure a reliable seal of the swivel tube at its end facing the feed cylinder as well as at its mounted end using constructionally more simple means, to achieve uniform wear of the wear parts and to facilitate their interchangeability as well as to construct the swivel tube preferable in such a way that it can be mounted optionally, turned by 180.degree. about a lateral axis.
This object is achieved according to the invention, in that the outer diameter of the face of the axially movable swivel tube at the side of the delivery pipe, which face is acted upon by the pressure of the material to be forwarded, is larger than the effective sealing diameter of the annular contact surface, by which th
REFERENCES:
patent: 3929400 (1975-12-01), Merton et al.
patent: 3989420 (1976-11-01), Taylor
patent: 4106882 (1978-08-01), Sherrod
patent: 4178142 (1979-12-01), Schwing
Cuomo Peter M.
Gluck Richard E.
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