Pumps – Expansible chamber type – Bellows-type chamber
Patent
1991-04-08
1992-08-25
Denion, Thomas E.
Pumps
Expansible chamber type
Bellows-type chamber
92 37, 92 44, F04B 4300, F04B 4502
Patent
active
051414120
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a double acting, bellows-type pump for gases and/or fluids, in particular aggressive and/or abrasive media, with two cylinder chambers arranged one above the other which are each divided by a bellows, hermetically connected at one end to a head wall of the relevant cylinder chamber and at its other end closed by a base, into an outer chamber and an inner chamber enclosed by the corresponding bellows: such that the bellows bases are mechanically interlocked by a piston rod which runs through at least one seal of each cylinder chamber, so that simultaneously one bellows draws in and one bellows delivers, in that the chambers adjacent to the seal or seals are connected with intakes and outlets for a medium under pressure and that the chambers facing away from the seal or seals are connected with intakes and outlets for the medium to be delivered.
A double acting bellows-type pump of this kind is known from FR-PS 13 15 900, which is intended for continuous delivery or for increasing the pressure of a fluid. This known pump possesses two bellows arranged one above the other in one cylinder chamber each, which alternately perform one drawing and one pressure stroke, whereby the medium to be delivered is located inside the bellows and the driving medium under pressure is outside the bellows.
A disadvantage of this known pump is that in the case of the delivery of fluids, self-acting ventilation on the delivery medium side is fundamentally not possible with this arrangement of the bellows. However, self-acting ventilation is absolutely necessary for the delivery of most fluid media, as otherwise fault-free functioning of the pump is not guaranteed.
The task of the present invention consists in designing a double acting bellows-type pump in such a way that it automatically releases air during operations, so that the air released in the medium to be delivered can constantly escape, and that it can perform large strokes as well as having a high number of load alternations.
This task is solved in accordance with the invention by a pump of the kind mentioned at the beginning in that in the cylinder chambers either one inner chamber each, or in the lower cylinder chamber one inner chamber and in the upper cylinder chamber one outer chamber, communicate or communicates directly with the seal or seals, and that the bellows of the inner chambers or inner chamber directly communicating with the seal/seals are supported in these inner chambers or this inner chamber by at least one guide element each, arranged concentrically to the corresponding bellows, whereby the guide element is fixed to the head wall of the relevant cylinder chamber.
In order to achieve automatic ventilation of all inner and outer chambers it must be possible to arrange the intakes or outlets at the highest point of each bellows in each case. This is possible with the pump in accordance with the invention.
In contrast with the known pump, in accordance with the invention the bellows of which the inner chamber connects directly with the seal or seals is subjected to inner excess pressure. However, bellows subjected in this way to inner excess pressure--as opposed to bellows subjected to outer excess pressure according to the state of the art technology described above--are not proof against buckling, making them unsuitable for use in a pump. For this reason a centric guide free from play is absolutely necessary for the bellows subjected to inner excess pressure on the side of the medium to be delivered.
The supported bellows can be extremely thin-walled, i.e. very flexible and have a high number of load alternations.
When this type of flexible bellows is used, the stroke end positions in both directions should not be overstepped, so as to avoid destroying the bellows which are designed for slight differential pressure. Determination of the end positions may be by means of mechanical or electrical sensors as desired. These are in most cases also available in encapsulated high-pressure-resistant versions. As soon as a c
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patent: 3791768 (1974-02-01), Wanner
patent: 4008984 (1977-02-01), Scholle
patent: 4334837 (1982-06-01), Inada et al.
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