US 10,194,557 B2
Thermal management system
Perry L. Hayden, Sr., Salinas, CA (US); Gary Chan, San Jose, CA (US); and Bob Dillman, San Jose, CA (US)
Assigned to CISCO TECHNOLOGY, INC., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Feb. 12, 2015, as Appl. No. 14/620,581.
Prior Publication US 2016/0242317 A1, Aug. 18, 2016
Int. Cl. H05K 7/20 (2006.01)
CPC H05K 7/20127 (2013.01) 13 Claims
OG exemplary drawing
 
1. A thermal management system comprising:
a device cage having a cage surface including at least one aperture; and
an air guide, characterized by a guide surface, having at least a portion spaced apart from the device cage, wherein the guide surface and the cage surface together form an air guide passage comprising:
an air intake portion having a first airflow area characterized by a first volumetric region between a first section of the inner surface of the air guide and the cage surface, wherein a distance between the first section of the inner surface of the air guide and the cage surface within the first airflow area is arranged to produce a first air pressure,
an airflow constriction portion, following the air intake portion, having a second airflow area characterized by a second volumetric region between a second section of the inner surface of the air guide and the cage surface, wherein a distance between the second section of the inner surface of the air guide and the cage surface within the second airflow area is arranged to produce a second air pressure, wherein a size of the first airflow area is greater than the second airflow area, and wherein the at least one aperture is located within the second airflow area, and
an outlet portion following the airflow constriction portion having a third airflow area characterized by a third volumetric region between a third section of the inner surface of the air guide and the cage surface, wherein a distance between the third section of the inner surface of the air guide and the cage surface within the third airflow area is arranged to produce a third air pressure, wherein a size of the third airflow area is greater than the second airflow area,
wherein the second air pressure associated with the second airflow area is less than the first air pressure associated with the first airflow area and the third air pressure associated with the third airflow area, and wherein the distance between the second section of the inner surface of the air guide and the cage surface within the second airflow area is set in order to produce the second air pressure that is sufficient to draw air from within the device cage through the at least one aperture to be expelled through the outlet portion of the air guide passage,
wherein at least the first, the second, and the third sections of the inner surface are integrally formed together as the guide surface of the air guide.