Plate-type heat pipe

Abstract

An exemplary plate-type heat pipe includes a hermetic container, working fluid contained in the container, a first wick portion and two second wick portions formed on inner surfaces of the container. The container includes an evaporating plate and a condensing plate facing each other. The evaporating plate includes a heat absorbing portion, two transition portions extending outwardly and upwardly from opposite ends of the heat absorbing portion, respectively, and two extending portions extending outwardly from outer ends of the transition portions, respectively. The first wick portion is formed on an inner surface of the heat absorbing portion. The second wick portions are formed on inner surfaces of the transition portions, respectively. The third wick portions are formed on inner surfaces of the extending portions, respectively. The third wick portions define capillary pores and a plurality of holes therein.

1 . A plate-type heat pipe comprising:
 a condensing plate;   an evaporating plate cooperating with the condensing plate to define a hermetic container, the evaporating plate comprising a heat absorbing portion and two extending portions located at opposite sides of the heat absorbing portion;   working fluid contained in the container; and   a first wick portion formed on an inner surface of the heat absorbing portion, and two second wick portions formed on inner surfaces of the extending portions, respectively, the second wick portions defining a plurality of holes therein.   
     
     
         2 . The plate-type heat pipe of  claim 1 , wherein the holes are through holes, each of which extends through a thickness of the corresponding second wick portion. 
     
     
         3 . The plate-type heat pipe of  claim 2 , wherein a number of auxiliary wick portions are received in the through holes, respectively, and contact the inner surfaces of the extending portions. 
     
     
         4 . The plate-type heat pipe of  claim 3 , wherein each of the auxiliary wick portions is thinner than the second wick portion, and comprises a first side contacting the inner surface of the corresponding extending portion of the evaporating plate and an opposite second side. 
     
     
         5 . The plate-type heat pipe of  claim 4 , wherein a cross-section of each of the auxiliary wick portions is a rectangle, the second side being parallel to the first side. 
     
     
         6 . The plate-type heat pipe of  claim 4 , wherein a cross-section of each of the auxiliary wick portions is a trapezoid, the second side being aslant relative to the first side. 
     
     
         7 . The plate-type heat pipe of  claim 6 , wherein the auxiliary wick portions are all oriented toward the same direction. 
     
     
         8 . The plate-type heat pipe of  claim 4 , wherein the second side of each of the auxiliary wick portions is concave, and a thickness of each of the auxiliary wick portions gradually increases from a central portion thereof to each of opposite ends thereof. 
     
     
         9 . The plate-type heat pipe of  claim 1 , wherein the evaporating plate further comprises two transition portions extending upwardly and outwardly from opposite edges of the heat absorbing portion and connecting with the two extending portions, respectively, and two third wick portions are formed on inner surfaces of the transition portions, respectively. 
     
     
         10 . The plate-type heat pipe of  claim 1 , wherein the evaporating plate further comprises two sidewalls extending upwardly from outer ends of the two extending portions, respectively, and connecting with the condensing plate, and two fourth wick portions are formed on inner surfaces of the sidewalls, respectively. 
     
     
         11 . The plate-type heat pipe of  claim 10 , wherein a wick member is adhered on an inner surface of the condensing plate and connects with the fourth wick portions. 
     
     
         12 . The plate-type heat pipe of  claim 1 , wherein a plurality of holes is defined in the first wick portion. 
     
     
         13 . A plate-type heat pipe comprising:
 a hermetic container comprising an evaporating plate and a condensing plate facing each other, the evaporating plate comprising a heat absorbing portion adapted for contacting a heat-generating component, two transition portions extending aslant from opposite lateral sides of the heat absorbing portion, respectively, and two extending portions extending outwardly from outer sides of the transition portions, respectively, the extending portions being closer to the condensing plate than the heat absorbing portion;   working fluid contained in the container; and   a wick member formed on an inner surface of the evaporating plate, comprising a first wick portion formed on an inner surface of the heat absorbing portion, two second wick portions formed on inner surfaces of the transition portions, respectively, and two third wick portions formed on inner surfaces of the extending portions, respectively, the third wick portions defining a plurality of holes.   
     
     
         14 . The plate-type heat pipe of  claim 13 , wherein the holes extends through the third wick portions in the thickness direction of the third wick portions. 
     
     
         15 . The plate-type heat pipe of  claim 14 , wherein a plurality of auxiliary wick are arranged in the holes of the third wick portions and contacts the inner surfaces of the extending portions. 
     
     
         16 . The plate-type heat pipe of  claim 15 , wherein each of the auxiliary wicks is thinner than the third wick portion. 
     
     
         17 . The plate-type heat pipe of  claim 15 , wherein the evaporating plate further comprises two sidewall extending upwardly from outer ends of the extending portions, respectively and connect opposite ends of the condensing plate, respectively, two fourth wick portion are formed on inner surfaces of the sidewalls. 
     
     
         18 . The plate-type heat pipe of  claim 17 , wherein another wick member is adhered on an inner surface of the condensing plate and connects with the fourth wick portions to form a continuous wick on an inner surface of the container. 
     
     
         19 . The plate-type heat pipe of  claim 13 , wherein the first wick portion is thinner than second wick portion and the third wick portion. 
     
     
         20 . The plate-type heat pipe of  claim 19 , wherein a plurality of holes is defined in the first wick portion.