Enclosure for leak detector
First Claim
Patent Images
1. A leak detection sensor for attachment to a fire hydrant, the leak detection structure comprising:
- a housing that is fixed to the fire hydrant, the fire hydrant defining an internal surface that defines a hydrant cavity, the housing being in fluid communication with the hydrant cavity, the housing having internal surfaces defining a housing cavity internal to the housing; and
a leak detection subassembly, the leak detection subassembly including;
at least one piezoelectric vibration sensor mounted with a fastener to an internal surface of the housing within the housing cavity, the at least one piezoelectric vibration sensor including a base and a piezoelectric layer deposited onto the base, the piezoelectric layer composed of piezoelectric crystals, the at least one piezoelectric vibration sensor arranged to receive a vibration from the housing via the fastener;
at least one circuit arranged within the housing cavity and in electrical communication with the at least one piezoelectric sensor;
an antenna in electrical communication with the at least one circuit;
and wherein the housing is rigid.
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Abstract
A leak detection structure for attachment to a fire hydrant includes an enclosure, the enclosure defining a cavity internal to the enclosure and a leak detection subassembly located in the cavity, the leak detection subassembly including at least one leak detection sensor and at least one circuit.
284 Citations
19 Claims
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1. A leak detection sensor for attachment to a fire hydrant, the leak detection structure comprising:
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a housing that is fixed to the fire hydrant, the fire hydrant defining an internal surface that defines a hydrant cavity, the housing being in fluid communication with the hydrant cavity, the housing having internal surfaces defining a housing cavity internal to the housing; and a leak detection subassembly, the leak detection subassembly including; at least one piezoelectric vibration sensor mounted with a fastener to an internal surface of the housing within the housing cavity, the at least one piezoelectric vibration sensor including a base and a piezoelectric layer deposited onto the base, the piezoelectric layer composed of piezoelectric crystals, the at least one piezoelectric vibration sensor arranged to receive a vibration from the housing via the fastener; at least one circuit arranged within the housing cavity and in electrical communication with the at least one piezoelectric sensor; an antenna in electrical communication with the at least one circuit; and wherein the housing is rigid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A leak detection structure permanently attached to a fire hydrant, the leak detection structure comprising:
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a nozzle cap fixed to the fire hydrant, the nozzle cap having internal surfaces defining a cavity internal to the nozzle cap, the nozzle cap defining an internal surface and an external surface, the internal surface and the external surface defining a nozzle cap bore extending from the internal surface to the external surface, an intersection between the nozzle cap bore and the external surface defining a nozzle cap outlet; a housing secured to the nozzle cap within the cavity of the nozzle cap, the housing having internal surfaces defining a cavity internal to the housing, at least one piezoelectric vibration sensor mounted with a fastener to an internal surface of the housing, the at least one piezoelectric vibration sensor including a base and a piezoelectric layer deposited onto the base, the piezoelectric layer composed of piezoelectric crystals, the at least one piezoelectric vibration sensor arranged to receive a vibration from the nozzle cap via the fastener; at least one circuit arranged in the cavity and in electrical communication with the at least one piezoelectric vibration sensor; and an antenna in electrical communication with the at least one circuit, the antenna protruding out from the fire hydrant through the nozzle cap outlet. - View Dependent Claims (16)
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17. A leak detection structure for attachment to a fire hydrant, the leak detection structure comprising:
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a housing assembly including a rigid primary housing and a rigid mating housing connected to the primary housing, the primary housing fixed to the fire hydrant, the primary housing defining a cavity that is open on one side of the primary housing, wherein the mating housing substantially seals the cavity; a leak detection subassembly, the leak detection subassembly including at least one piezoelectric vibration sensor mounted with a fastener to an internal surface of the housing within the cavity, the at least one piezoelectric vibration sensor including a base and a piezoelectric layer deposited onto the base, the piezoelectric layer composed of piezoelectric crystals, the at least one piezoelectric vibration sensor arranged to receive a vibration from the housing via the fastener, at least one circuit arranged within the cavity and in electrical communication with the at least one piezoelectric vibration sensor, and an antenna in electrical communication with the at least one circuit; and an antenna enclosure fixed to the fire hydrant, the antenna arranged within the antenna enclosure. - View Dependent Claims (18, 19)
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Specification