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US 9,791,354 B2Granted
Inline pre-filter for aspirated detectors
AssigneeHoneywell International Inc.
InventorLudger Koester
Life of this patent
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Abstract
An apparatus which includes an aspirated smoke detector, and a pre-filter coupled to an inflow port of the detector wherein the pre-filter carries a removable filter element. The filter element is configured such that when it is removed, fluid flow through the filter is blocked. When the filter element is present in the pre-filter, fluid flow through the filter is permitted.
Claims13
A pre-filter apparatus comprising:
- a housing with a fluid flow inflow port and a fluid flow outflow port, the housing defining, in part, an interior region;
- a blocking member carried in the interior region and movable relative to the housing;
- and
- a replaceable filter element disposed between the housing and the blocking member,
- wherein the blocking member engages a biasing element to provide a blocking force such that, when the replaceable filter element is removed, the blocking member blocks fluid flow into and out of the housing through both the fluid flow inflow port and the fluid flow outflow port.
2 more elements
An apparatus comprising:
- an aspirated detector;
- and
- a pre-filter having an inflow port and an outflow port,
- wherein the outflow port is coupled to the aspirated detector,
- wherein the pre-filter carries a removable filter element configured such that, when the removable filter element is removed, fluid flow through the pre-filter is blocked through the inflow port and the outflow port,
- wherein the pre-filter includes a spring loaded blocking member in a blocking state when the removable filter element is not present,
- wherein the removable filter element, when present, displaces the spring loaded blocking member from the blocking state to a fluid flow state,
- wherein the spring loaded blocking member, when in the blocking state, blocks the fluid flow through the inflow port and the outflow port,
- wherein the spring loaded blocking member, when in the fluid flow state, allows the fluid flow through the inflow port and the outflow port,
- wherein the spring loaded blocking member includes a spring to move the spring loaded blocking member between the blocking state and the fluid flow state,
- wherein the pre-filter includes a housing,
- wherein the spring loaded blocking member is removably attached to the housing, and
- wherein the removable filter element, when present, is disposed between the housing and the spring loaded blocking member.
10 more elements
Dependencies are inferred from the claim text.