Fluid drip detector
First Claim
1. A fluid drip detector for detecting presence of drops and leaks of fluid via measured changes in electrical resistances, comprising:
- an electrically conducting housing having an electrical lead and first electrical contact protruding into the housing, the lead and contact being electrically insulated from the housing, the housing having a seat disposed therein;
an electrically conducting moving door means and second electrical contact situated in the housing, said moveable door means capable of mechanically engaging with and/or disengaging from the seat;
the door means being responsive to a fluid drip via the hydraulic pressure drop caused by the presence of a drop in the housing thereby disengaging the door from the seat in a drip condition such that the electrical resistance between door and seat increases in a drip condition, but the door means is normally engaging the seat and the lead in a no drip condition characterized by a minimum resistance value between said door and seat; and
an electric resistance detector means connected to the lead and said door means for producing an electrical output in the event of a drip condition.
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Accused Products
Abstract
An electric resistance measuring device situated in fluids, comprising; a housing having a bore therethrough, the bore having a seat; a movable door means situated in the bore, engagable with the seat; whereby, fluid movement disengages the door from the seat, changing the electrical resistance between the seat and the door. Such a device can detect leaks which increase the electrical resistance between the seat and the door. A panel provides selector means which can be set at different modes, each mode providing a different period of time in which fluid can be used continuously without interruption. If fluid movement exists after such period, a cut off valve will shut off the fluid. Such a device can be installed in line with fire sprinklers, such that the device will detect a fire and will send a signal to a central station.
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Citations
16 Claims
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1. A fluid drip detector for detecting presence of drops and leaks of fluid via measured changes in electrical resistances, comprising:
- an electrically conducting housing having an electrical lead and first electrical contact protruding into the housing, the lead and contact being electrically insulated from the housing, the housing having a seat disposed therein;
an electrically conducting moving door means and second electrical contact situated in the housing, said moveable door means capable of mechanically engaging with and/or disengaging from the seat;
the door means being responsive to a fluid drip via the hydraulic pressure drop caused by the presence of a drop in the housing thereby disengaging the door from the seat in a drip condition such that the electrical resistance between door and seat increases in a drip condition, but the door means is normally engaging the seat and the lead in a no drip condition characterized by a minimum resistance value between said door and seat; andan electric resistance detector means connected to the lead and said door means for producing an electrical output in the event of a drip condition. - View Dependent Claims (2, 3, 4, 5, 6, 15, 16)
- an electrically conducting housing having an electrical lead and first electrical contact protruding into the housing, the lead and contact being electrically insulated from the housing, the housing having a seat disposed therein;
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7. A fluid drip detector installed in a fluid feeding line for sensing presence of drops and leaks of fluid therefrom comprising,
an electrically conducting hollow housing having a bore for fluid passage therethru; -
a first electrical conductor, insulated from the housing, having a first end protruding into the bore and a second end protruding out of the housing, where said first end has a first electrical contact attached thereon; a stationary seat and moveable door situated in the bore; a conducting movable door means urged against the seat by urging means, the door being responsive to fluid drip via the hydraulic pressure drop caused by the presence of a drop in the housing, thereby disengaging the seat in a drip condition, and engaging the seat in a no drip condition, such that in a no drip condition the door communicates electrically with the first end of the first electrical conductor and engages the seat, creating a minimum electrical resistance between the door and the seat, and in a drip condition, the door being disengaged from the seat, thereby creating a change in resistance between the door and the seat, and first electric resistance detector means connected between the housing and the second end of the first electrical conductor for producing an output when detecting a change in electrical resistance. - View Dependent Claims (8, 9)
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10. A fluid drip detector installed in a fluid feeding line for sensing presence of drops and leaks of fluid therefrom comprising;
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a hollow housing having a bore for fluid passage therethru; a first electrical conductor having a first end protruding from the housing into the bore and a second end protruding out of the housing; an electrically conducting seat disposed in the bore; a seat electrical conductor having a first end connected to the seat and having a second end protruding outside of the housing; an electrically conducting moveable door means urged against the seat by urging means, said moveable door means capable of mechanically engaging with and/or disengaging from the seat;
the door being responsive to fluid drip at the door means through being responsive to a drip via the hydraulic pressure drop caused by the presence of a drop in the housing, thereby disengaging the seat in a drip condition, and engaging the seat in a no drip condition, such that in a no drip condition the door communicates electrically with the first electrical conductor and engages the seat, creating a minimum electrical resistance between the door and the seat, and in a drip condition, the door being disengaged from the seat with a small separation gap therebetween, thus creating an increase in resistance between the door and the seat, andfirst electric resistance detector means connected between the second end of the seat electrical conductor and the second end of the first electrical conductor, for producing an output when detecting a change in electrical resistance. - View Dependent Claims (11, 12, 14)
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13. An electric resistance measuring device to be situated in a fluids handling system for sensing fluid movement in said measuring device, as caused by the presence of any fluid drops or fluid leakage, comprising:
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a housing having a bore therethru to permit fluid flow and passage thru the housing, the bore having a seat; a moveable door means situated in the bore, normally engageable with the seat when there is no fluid flow, but disengageable from the seat in response to any fluid movement; whereby, fluid movement disengages the door from the seat via the presence of said fluid therebetween, thus changing the electrical resistance measured between the seat and the door, thereby indicating the presence of fluid drops or leaks.
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Specification