Pumps – Expansible chamber type
Patent
1985-05-02
1986-07-08
Smith, Leonard E.
Pumps
Expansible chamber type
417468, 417472, 417900, F04B 1902
Patent
active
045990530
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a displacement pump intended in particular for abrasive and difficult to pump fluids such as concrete consisting of a pump chamber formed from a first tubular slide component and a second similarly tubular slide component, with the second slide component being supported outside the first slide component in such a way that the second slide component can be moved forwards and backwards outside the first slide component, said slide components being so arranged as to move forwards and backwards in relation to each other so as to produce a cycle of compression and suction strokes, with a sleeve of a soft elastic material such as rubber being arranged inside the pump chamber and covering the walls of the chamber and the contact surface between the two slides, and with lines for the supply and removal respectively of the medium to be pumped being connected to the chamber.
BACKGROUND
Displacement pumps generally exhibit certain characteristics which make them less suited to certain applications, although the displacement pump may be preferred in view of other of its characteristics. One such characteristic, which makes most displacement pumps difficult to use with aggressive fluids and fluids with particles mixed in or in suspension, expecially those which cause wear, is the fact that most displacement pumps include parts which are required to move in relation to each other during sealing. The situation becomes even more problematical if the fluid being pumped has a tendency to cake and to become attached to the walls of the pump. Examples of fluids of this kind which are difficult to pump are asphalt, concrete, sewage, molasses and paper pulp. Experiments have been conducted in an attempt to modify displacement pumps for pumping of this kind by fitting scraper rings or by manufacturing the component parts of the pump from a soft material such as rubber. In spite of the fact that these experiments have produced excellent pump designs in many cases, the need still remains for further types of pumps suitable for particularly difficult fluids, amongst which concrete can be mentioned, which has a viscous consistency, is extremely abrasive and is difficult to remove once it has become baked and has assumed a solid state.
TECHNICAL PROBLEM
It may thus be established that it has been possible only to a limited extend to produce pumps of the displacement type which are also suitable for use with difficult to pump fluids and at high pressures without leakage occurring.
SOLUTION
The aforementioned problems are solved by a pump in which the sleeve is free along essentially the entire distance between its attachment points and which has a length in the unactuated state which corresponds essentially to the distance between the points of attachment when the slide components adopt their most compressed position so that the sleeve, which is capable of elastic extension, will be subjected to extension with elastic stretching only when its slide components are working.
ADVANTAGES
A pump of the indicated type is proposed by the invention, which has a free, smooth-surfaced bore, which reduces the risk of blocking and facilitates cleaning.
BRIEF DESCRIPTION OF DRAWINGS
In the accompanying drawings are illustrated two embodiments of the invention.
FIG. 1 shows a sectional view of the first embodiment; and
FIG. 2 shows a sectional view of the second embodiment.
BEST MODE OF CARRYING OUT THE INVENTION
The embodiment shown in FIG. 1 comprises a pump unit 1, which constitutes that part of the pump which performs the pumping work. The pump unit comprises an inner tubular slide 2 with a flange 3 and an outer tubular slide 4 with a flange 5. The two slides 2 and 4 are cylindrical and are capable of axial movement in relation to each other at contact surfaces. The surfaces of the slides which correspond to the contact surfaces taper in a conical fashion at the free ends of the slides, as may be appreciated from the Figure. Inside the slides there is arranged a gaiter 6 of an e
REFERENCES:
patent: 1527545 (1925-02-01), Emmerling et al.
patent: 2721027 (1955-10-01), Schwartz
patent: 3228340 (1966-01-01), Hubbard
patent: 3429272 (1969-02-01), Wilhite
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