US 9,810,483 B2
Variable-conductance heat transfer device
Walter John Bilski, Mohnton, PA (US); Jerome E. Toth, Exton, PA (US); and John G. Thayer, Lancaster, PA (US)
Assigned to Thermal Corp., Wilmington, DE (US)
Filed by Walter John Bilski, Mohnton, PA (US); Jerome E. Toth, Exton, PA (US); and John G. Thayer, Lancaster, PA (US)
Filed on May 17, 2012, as Appl. No. 13/473,755.
Claims priority of provisional application 61/645,906, filed on May 11, 2012.
Prior Publication US 2013/0299136 A1, Nov. 14, 2013
Int. Cl. F28F 27/00 (2006.01); F28D 15/04 (2006.01); F28F 13/14 (2006.01); F28D 15/02 (2006.01)
CPC F28D 15/046 (2013.01) [F28D 15/0275 (2013.01); F28F 13/14 (2013.01)] 56 Claims
OG exemplary drawing
 
1. A heat transfer device for conducting heat from a heat source, the heat transfer device having a longitudinal axis and comprising:
an evaporator for generating a vapor, the evaporator defined by at least one wall;
a condenser in fluid communication with the evaporator, the condenser defined by at least one wall, wherein the walls that define the evaporator and the condenser together define an interior space; and
a vapor flow restrictor interposed between the evaporator and the condenser,
wherein the vapor flow restrictor has opposed planar surfaces each orthogonal to the longitudinal axis of the heat transfer device and an orifice of constant cross section extending between the opposed planar surfaces, wherein the orifice defines a vapor flow path between the evaporator and condenser, wherein the vapor flow path is unobstructed through the orifice at all operating temperatures,
wherein the vapor flow restrictor increases vapor pressure in at least a portion of the evaporator relative to vapor pressure in the condenser,
wherein the vapor flow restrictor is configured to decrease the vapor flow rate from the evaporator to the condenser as the evaporator temperature decreases,
wherein vapor passes from the evaporator toward the condenser through the vapor flow restrictor, and
wherein condensed working fluid passes in the interior space from the condenser back toward the evaporator past the vapor flow restrictor.