Electromechanical device for the protection of a pump in waterworks of various types, in the absence of water
First Claim
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1. A pump protection device comprising:
- a housing defining first and second chambers, said first chamber being in communication with a flow of a pump;
a diaphragm positioned across said first chamber;
a movable element having a first portion in contact with said diaphragm, said movable element having a second portion extending from said first chamber into said second chamber;
a spring means for biasing said movable element against said diaphragm;
electrical circuit means positioned in said second chamber and for interacting with said second portion of said movable element to determine when a pressure of the flow is an insufficient pressure for the pump to operate, said electrical circuit means blocking operation of the pump when said pressure is insufficient;
an annular seal positioned around said second portion of said movable element to form a seal between said first chamber and said second chamber.
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Abstract
The device comprises: a branch (5) from the outlet (M) of the pump to a cavity (7) partially delimited by a membrane (14); a moving element (16, 22, 24) in a casing (9); a spring (36) pushing said element (16, 22, 24) toward the membrane (14) and capable of yielding under the action of a relatively restricted pressure of the water which reaches said cavity (7) and acts on the membrane; and moving electrical contacts (26) on said element (16, 22, 24), interacting with fixed contacts (28) of a supply circuit of the pump, to enable the pump to be switched on and to switch it off in the absence of pressure acting on the membrane (14).
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Citations
15 Claims
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1. A pump protection device comprising:
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a housing defining first and second chambers, said first chamber being in communication with a flow of a pump; a diaphragm positioned across said first chamber; a movable element having a first portion in contact with said diaphragm, said movable element having a second portion extending from said first chamber into said second chamber; a spring means for biasing said movable element against said diaphragm; electrical circuit means positioned in said second chamber and for interacting with said second portion of said movable element to determine when a pressure of the flow is an insufficient pressure for the pump to operate, said electrical circuit means blocking operation of the pump when said pressure is insufficient; an annular seal positioned around said second portion of said movable element to form a seal between said first chamber and said second chamber. - View Dependent Claims (2, 3, 4)
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5. A pump protection device comprising:
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a housing defining first and second chambers, said first chamber being in communication with a flow of a pump; a diaphragm positioned across said first chamber; a movable element having a piston in contact with said diaphragm, said movable element having a piston rod extending through said first chamber and said second chamber; a spring means positioned in said first chamber and for biasing said movable element against said diaphragm; electrical circuit means for interacting with another portion of said movable element to determine when a pressure of the flow is an insufficient pressure for the pump to operate, said electrical circuit means blocking operation of the pump when said pressure is insufficient, said electrical circuit means including fixed contacts on said housing and movable contacts on said movable element, said fixed and movable contacts being positioned in said second chamber; an annular seal positioned around said piston rod to form a seal between said first chamber and said second chamber. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A pump protection device comprising:
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a housing defining a chamber in communication with a flow of a pump, said housing including a casing and a base with a branch connected to an outlet of the pump; a diaphragm positioned across said chamber, said diaphragm partially delimiting said chamber, said diaphragm being positioned between said casing and said base; a movable element having a portion in contact with said diaphragm; a spring means for biasing said movable element against said diaphragm, said spring means yielding said diaphragm when a pressure of said flow is greater than an insufficient pressure for the pump to operate; electrical circuit means for interacting with another portion of said movable element to determine when said pressure of the flow is said insufficient pressure, said electrical circuit means blocking operation of the pump when said pressure is insufficient, said electrical circuit means including fixed contacts on said housing and movable contacts on said movable element, said movable contacts being in electrical contact with said fixed contacts when said pressure of the flow is sufficient, said electrical circuit means enabling the pump to be switched on when said pressure of the flow is greater than said insufficient pressure, said electrical circuit means switching the pump off when said pressure of the flow is less than or equal to said insufficient pressure; said casing defines another chamber which includes said movable and fixed contacts; said movable element includes a piston positioned in said chamber and a rod extending from said piston to said another chamber; an annular seal positioned around said rod to form a seal between said chamber and said another chamber.
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Specification