Liquid level assembly with diaphragm seal
First Claim
1. A liquid level assembly for use with a pump, comprising:
- switching means responsive to liquid head pressure for actuating the pump;
a housing having an internal cavity in which the switching means is supported and having an open end;
seal means for sealing the open end of the housing and for transmitting pressure of the liquid head to the switching means, the seal means comprising;
a diaphragm seal having a center planar portion disposed to abut the switching means, a peripherally extending web portion and a flexible bellows portion connecting the planar portion and the peripheral web portion; and
a plurality of knob members extending from the peripheral web portion disposed to press against the switching means.
3 Assignments
0 Petitions
Accused Products
Abstract
A liquid level assembly for controlling liquid level has a switching mechanism responsive to the liquid head to activate a pump. A housing assembly has an internal cavity in which the switching mechanism is supported, the housing assembly having an open end sealed by a diaphragm seal having a flexible planar portion that transmits head pressure to the switching mechanism. The diaphragm seal also has a peripheral web portion and a flexible bellows portion connecting the flexible planar portion and the peripheral web portion. The peripheral web portion has a peripheral sealing bead that is sealingly compressed against a groove in the housing assembly, and a plurality of knob members extend from the peripheral web to press against the switching assembly, thereby accommodating manufacturing dimensional tolerances of the switching mechanism.
71 Citations
23 Claims
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1. A liquid level assembly for use with a pump, comprising:
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switching means responsive to liquid head pressure for actuating the pump;
a housing having an internal cavity in which the switching means is supported and having an open end;
seal means for sealing the open end of the housing and for transmitting pressure of the liquid head to the switching means, the seal means comprising;
a diaphragm seal having a center planar portion disposed to abut the switching means, a peripherally extending web portion and a flexible bellows portion connecting the planar portion and the peripheral web portion; and
a plurality of knob members extending from the peripheral web portion disposed to press against the switching means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A liquid level assembly for immersion in a liquid and for use with a pump, comprising:
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a housing assembly comprising;
an upper housing member forming a housing cavity;
a lower housing member; and
means connecting the lower housing member to the upper housing member;
a switching mechanism supported in the housing cavity and connectable to the pump for actuating the pump in response to liquid head pressure;
a diaphragm seal disposed between the upper housing member and the lower housing member to seal the housing cavity, the lower housing member having at least one opening whereby the diaphragm seal is subjected to liquid head pressure, the diaphragm seal having a flexible portion disposed to abut and actuate the switching mechanism, the diaphragm seal having a plurality of knob members that cooperate with the upper and lower housing members to support the switching mechanism. - View Dependent Claims (13, 14, 15, 16, 17)
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18. In a liquid level assembly immersible in a liquid to actuate a pump in response to liquid head pressure in which the liquid level assembly has a housing assembly having a housing cavity formed by a first housing member and a second housing member attached thereto, a switching mechanism being supported in the housing cavity, the improvement comprising:
a diaphragm seal disposed between the first housing member and the second housing member to seal the housing cavity, the lower housing member having at least one opening whereby the diaphragm seal is subjected to liquid head pressure, the diaphragm seal having a flexible portion disposed to abut and actuate the switching mechanism, the diaphragm seal having a plurality of knob members that cooperate with the first and second housing members to press the switching mechanism so that dimensional tolerances of the switching mechanism are accommodated. - View Dependent Claims (19, 20, 21, 22, 23)
Specification