Liquid-cooling device

Abstract

A liquid-cooling device includes a heat exchanger defining a cavity therein and a liquid-guiding component received in the cavity. The liquid-guiding component includes a body and a fixing portion extending from the body and fixed to the heat exchanger. A first liquid passage is defined through the body and a second liquid passage is formed between the body and an inner sidewall of the heat exchanger surrounding the cavity. The first liquid passage is in fluid communication with the second liquid passage via a bottom of the cavity. An outlet and an inlet are formed at an end of the liquid-guiding component and in fluid communication with the first and second liquid passages. Liquid flows in the cavity of the heat exchanger via the first liquid passage and has a sufficient contact with the inner sidewall of the heat exchanger.

1  A liquid-cooling device, comprising:
 a heat exchanger comprising a bottom face adapted for contacting an electronic device, the heat exchanger defining a cavity over the bottom face thereof; and   a liquid-guiding component comprising a hollow body defining a first liquid passage therethrough and a fixing portion engaging with the heat exchanger, the body being disposed in the cavity and spaced from a bottom of the cavity of the heat exchanger, a second liquid passage being defined between an outer periphery of the body and an inner sidewall of the heat exchanger surrounding the cavity, the second liquid passage being in fluid communication with the first liquid passage via the bottom of the cavity;   wherein an outlet and an inlet are formed at one end of the liquid-guiding component distant from the bottom of the cavity, the outlet and inlet being in fluid communication with the cavity of the heat exchanger, whereby cooling liquid enters the cavity via the inlet, passes through the first and second liquid passages and leaves the cavity via the outlet.   
     
     
         2 . The liquid-cooling device as claimed in  claim 1 , wherein the fixing potion extends outwardly from the body and abuts against an inner sidewall of the heat exchanger surrounding the cavity. 
     
     
         3 . The liquid-cooling device as claimed in  claim 2 , wherein the fixing portion comprises an annular flange extending outwardly from a circumference of the body and an outer edge of the annular flange abutting against the inner sidewall of the heat exchanger surrounding the cavity. 
     
     
         4 . The liquid-cooling device as claimed in  claim 2 , wherein the heat exchanger defines a fixing slot surrounding the cavity and the fixing portion is received in the fixing slot to be secured to the heat exchanger. 
     
     
         5 . The liquid-cooling device as claimed in  claim 4 , wherein the heat exchanger comprises a base plate and a heat-absorbing portion extending from the base plate to contact the electronic device and the cavity is defined in the heat-absorbing portion. 
     
     
         6 . The liquid-cooling device as claimed in  claim 5 , wherein the fixing portion of the liquid-guiding component defines the inlet and the body defines the outlet at an end thereof, the inlet and the outlet are respectively in fluid communication with the second and first liquid passages. 
     
     
         7 . The liquid-cooling device as claimed in  claim 5 , wherein the body of the liquid-guiding component has a gradually decreased cross section along a direction remote from the base plate of the heat exchanger, the inlet and the outlet being in fluid communication with the first and second liquid passages, respectively. 
     
     
         8 . The liquid-cooling device as claimed in  claim 7 , wherein the heat exchanger defines an annular groove in the inner sidewall surrounding the cavity. 
     
     
         9 . The liquid-cooling device as claimed in  claim 1 , wherein the liquid-guiding component comprises a fixing plate engaging an inner sidewall of the heat exchanger surrounding the cavity and the inlet is formed between an outer edge of the fixing plate and the inner sidewall of the heat exchanger. 
     
     
         10 . The liquid-cooling device as claimed in  claim 9 , wherein the heat exchanger defines a fixing slot surrounding the cavity and the fixing plate of the liquid-guiding component is received in the fixing slot with a gap therebetween, whereby a third liquid passage being defined between a lower surface of the fixing plate and a bottom of the fixing slot and in fluid communicated with the inlet and the second liquid passage. 
     
     
         11 . The liquid-cooling device as claimed in  claim 10 , wherein the heat exchanger comprises a base plate defining the fixing slot surrounding the cavity and a heat-absorbing portion extending from the base plate, the cavity being defined in the heat-absorbing portion. 
     
     
         12 . The liquid-cooling device as claimed in  claim 11 , wherein the fixing plate of the liquid-guiding component comprises a plurality of spaced tongues engaging an inner sidewall of the base plate of the heat exchanger. 
     
     
         13 . The liquid-cooling device as claimed in  claim 12 , wherein the fixing plate of the liquid-guiding component is spaced from a bottom of the of the fixing slot and has a thickness smaller that a depth of the fixing slot.