Pumps – Expansible chamber type – Elongated flexible chamber wall progressively deformed
Patent
1985-11-13
1987-02-24
Vrablik, John J.
Pumps
Expansible chamber type
Elongated flexible chamber wall progressively deformed
251 9, F04B 4312, F16K 1503, F16K 1518, F16L 5514
Patent
active
046454349
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device in a peristaltic pump of the type comprising at least one pressure body driven along a circular path, a support structure concentrically disposed around at least the major part of said path and accommodating an elastic hose which is subjected to local compression towards the support structure by the action of the pressure body in response to the movement of said body along its circular path, and an annular member placed between the pressure body and the hose with its interior circumference abutting against the pressure body and its exterior circumference abutting against the hose, the annular member being locally pressed towards the hose by the pressure body.
Due to the placement of the annular member in this conventional type of pump between the pressure body or bodies and the pump hose resting on the support structure, this hose participates to a large extent in the travelling local compression along the extension of the hose as a consequence of the eccentric movement of the annular member, resulting in a very tight compression of the hose with only one stress wave per pump revolution therein because of the fact that the pressure bodies, regardless of their number, will always act on the annular member instead of each individual body acting directly on the hose.
With the annular member being dimensioned so that its outer diameter is smaller than the diameter of the inner circumference of the hose section lying in the support structure disposed concentrically around the circular path of movement of the pressure body, while its inner diameter is larger than half the diameter of the circular path of the pressure body, there is achieved an extremely high pumping effect by virtue of the pressure body or bodies being utilized for compressing the pump hose along practically its entire circular path of movement.
The object of the invention is to provide improved peristaltic pumps of the above-described type by suggesting a device appropriate for this purpose, which is simple and reliable in operation and which makes it possible for such pumps to perform considerable heights of delivery.
A device made in accordance with the present invention, which fulfills this objective and which in practical tests has proved not only reliable but also extremely gentle towards the elastic hose, is primarily distinguished by a non-return valve acting adjacent the end of the hose connected to the pressure outlet of the pump, at least part of the outer circumference of the annular member together with the pressure body constituting the operating mechanism for said valve.
The non-return valve of the inventive device is preferably designed as a movable element reciprocating in relation to the pressure outlet end of the pump hose.
In a particularly simple and uncomplicated embodiment of the invention, this movable element is formed as a flap reciprocating with its free end in relation to the pressure outlet end of the pump hose while being pivotally journalled at its opposite end, the side of said flap facing the interior of the pump housing having a cam profile for coaction with the outer circumference of the annular member. More closely defined, this coaction takes place when the pressure body by-passes the flap during which movement the pressure body, via the annular member and the cam-profiled surface on the pivotable flap, forces the free flap end towards the outlet end of the pump hose for closing it until a new amount of fluid is to be forced out through the pressure outlet under the continuous rotary movement of the pump.
It appears from the foregoing that a device performed in accordance with the invention presents a considerable advantage over the prior art technique, and this has been accomplished by means of an extremely simple and inexpensive completion of the pump construction in its entirety.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail below with reference to an exemplary embodiment illustrated in the drawings, of which FIG. 1 is a side v
REFERENCES:
patent: 2231579 (1941-02-01), Huber
patent: 3726613 (1973-04-01), Von Casimir
Sala International AB
Vrablik John J.
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