US 11,883,697 B2
Fire detection inside a transport refrigeration unit
Loic Renault, Saint Etienne du Rouvray (FR)
Assigned to CARRIER CORPORATION, Palm Beach Gardens, FL (US)
Appl. No. 16/609,957
Filed by Carrier Corporation, Palm Beach Gardens, FL (US)
PCT Filed May 19, 2017, PCT No. PCT/IB2017/000838
§ 371(c)(1), (2) Date Oct. 31, 2019,
PCT Pub. No. WO2018/211305, PCT Pub. Date Nov. 22, 2018.
Prior Publication US 2020/0054906 A1, Feb. 20, 2020
Int. Cl. A62C 3/07 (2006.01); A62C 37/44 (2006.01); A62C 3/00 (2006.01)
CPC A62C 3/07 (2013.01) [A62C 3/004 (2013.01); A62C 37/44 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A transport refrigeration unit (TRU), comprising:
a housing;
components supportively disposed in the housing and configured to condition an interior of a container; and
a fire detection and mitigation system comprising:
a fire detection sub-system which is partially disposable within the housing and configured to detect a thermal event therein; and
a mitigation sub-system coupled to the fire detection sub-system and configured to take a mitigation action responsive to the thermal event being sensed by the fire detection sub-system,
wherein:
the fire detection sub-system comprises a loop within the housing with a nominal pressure which is increasable responsive to a thermal event within the housing and a switch which is actuatable by an increased pressure in the loop to activate the mitigation sub-system and the loop comprises piping charged with gas that begins and terminates at the switch and follows a serpentine configuration with multiple hairpin turns, and
the mitigation sub-system comprises a safety controller and the mitigation action comprises a modification of gas flow to the components by the safety controller.