Membrane pump with stretchable pump membrane
First Claim
1. A pump device comprising:
- a pump housing, a pump cavity formed within the housing, the pump cavity comprising a first wall portion and an opposed second wall portion, the first wall portion having a generally hollow configuration and the second wall portion having a generally raised configuration relative to the pump cavity, a pump membrane comprising a first membrane surface and a second membrane surface, the pump membrane being arranged within the pump cavity, a pump chamber defined between the first wall portion and the first membrane surface, an actuation chamber defined between the second wall portion and the second membrane surface, inlet means in fluid communication with the pump chamber, outlet means in fluid communication with the pump chamber, wherein the pump membrane has a maximum volume position in which the second membrane surface in a stretched state abuts and substantially conforms to the general configuration of the second wall portion, and a drained volume position in which the first membrane surface in a stretched state abuts and substantially conforms to the general configuration of the first wall portion, and actuating means for periodically shifting the pump membrane between the maximum volume position and the drained volume position, whereby metering accuracy of the pump device is determined by the first and second wall portions.
1 Assignment
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Accused Products
Abstract
The invention relates to membrane pumps for delivering liquids. More specifically, a pump is provided having a pump housing with a pump cavity formed between first and second wall portions thereof, and an pump membrane pump membrane having first and second membrane surfaces arranged within the pump cavity, whereby a pump chamber is provided between the first wall portion and the first membrane surface, and an actuation chamber is provided between the second wall and the second membrane surface. Inlet means comprising an inlet valve in fluid communication with the pump chamber, and outlet means comprising an outlet valve in fluid communication with the pump chamber are provided. The pump membrane has a maximum volume position, and a drained volume position in which the first membrane surface in a stretched state abuts the first wall. To drive the membrane, actuating means for periodically shifting the pump membrane between the maximum volume position and the drained volume position is provided, thereby, in a situation of use, providing a flow of fluid.
384 Citations
31 Claims
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1. A pump device comprising:
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a pump housing, a pump cavity formed within the housing, the pump cavity comprising a first wall portion and an opposed second wall portion, the first wall portion having a generally hollow configuration and the second wall portion having a generally raised configuration relative to the pump cavity, a pump membrane comprising a first membrane surface and a second membrane surface, the pump membrane being arranged within the pump cavity, a pump chamber defined between the first wall portion and the first membrane surface, an actuation chamber defined between the second wall portion and the second membrane surface, inlet means in fluid communication with the pump chamber, outlet means in fluid communication with the pump chamber, wherein the pump membrane has a maximum volume position in which the second membrane surface in a stretched state abuts and substantially conforms to the general configuration of the second wall portion, and a drained volume position in which the first membrane surface in a stretched state abuts and substantially conforms to the general configuration of the first wall portion, and actuating means for periodically shifting the pump membrane between the maximum volume position and the drained volume position, whereby metering accuracy of the pump device is determined by the first and second wall portions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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17. A pump device as defined in 6, further comprising:
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control means for operating the actuation means at a predetermined priming cycle frequency, means for detecting a membrane movement pattern, the control means being adapted for continuing operation of the pump in accordance with the priming cycle frequency until the difference between a series of consecutively detected membrane movement patterns are within a predefined range, the control means being adapted to terminate pump actuation in response thereto.
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Specification