Double diaphragm leakproof sealing device for electric windscreen washer pumps
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United States of America Patent
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Sep 6, 1994
Grant Date -
N/A
app pub date -
Aug 19, 1992
filing date -
Dec 21, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A double diaphragm leakproof sealing device for electric windscreen washer pumps has a directing chamber housing two very resilient diaphragms which may be provided with compensating elements for loss of resilience. When there is no leaning liquid pressure, the two diaphragms permanently block, by way of their own resilient action and, as the case may be, by the action of the resilience loss compensating elements, the corresponding discharge ports of the chamber. Depending on the direction of rotation of the pump impeller, the cleaning liquid will cause the resilient deformation of the corresponding diaphragm, allowing the cleaning liquid to flow through the associated discharge passage. When the impeller stops rotating, the diaphragm reestablishes the sealing action on the discharge port.
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