Passive heat-dissipating fan system and electronic system containing the same

Abstract

A passive heat-dissipating fan system comprises an air-providing device, a cold-end passive heat-dissipating assembly, a hot-end passive heat-dissipating assembly, a separation device capable of guiding airflow to the cold-end and hot-end passive heat-dissipating assemblies, and a cooling device which is disposed in the separation device and has cold and hot ends. When the airflow from the air-providing device passes through the separation device and cooling device, airflow from the air-providing device is separated and then partially directed to the cold-end passive heat-dissipating assembly and partially directed to the hot-end passive heat-dissipating assembly respectively, expelling the heated airflow to an exterior of an electronic system. Because the temperature of the airflow passing through the cold-end passive heat-dissipating assembly is higher than that of dew point of air, the airflow passing through the cold-end passive heat-dissipating assembly can dissipate the heat generated by an electronic element without producing dew.

1 . A passive heat-dissipating fan system, comprising: 
 an air-providing device;    a cold-hot separation assembly connected to the air-providing device;    at least one hot-end passive heat-dissipating assembly connected to the cold-hot separation assembly; and    at least one cold-end passive heat-dissipating assembly connected to the cold-hot separation assembly, wherein when an airflow from the air-providing device passes through the cold-hot separation assembly, the airflow is separated, and directed to the cold-end passive heat-dissipating assembly and the hot-end passive heat-dissipating assembly, respectively.    
   
   
       2 . The passive heat-dissipating fan system as claimed in  claim 1 , wherein the air-providing device comprises an active fan and an air-providing pipe connected to the active fan, and the active fan comprises an axial fan or a centrifugal fan.  
   
   
       3 . The passive heat-dissipating fan system as claimed in  claim 1 , wherein the cold-hot separation assembly comprises a separation device having a separation element therein and a cooling device having a cold end and a hot end, wherein the cooling device is connected to the separation element and the cold and hot ends are respectively disposed on both sides of the separation element, and a hot-end chamber and a cold-end chamber are defined in the separation device by the separation element and the cooling device, wherein the hot end of the cooling device is disposed in the hot-end chamber and the cold end of the cooling device is disposed in the cold-end chamber.  
   
   
       4 . The passive heat-dissipating fan system as claimed in  claim 3 , wherein the cooling device comprises a thermal electric cooler or a thermoacoustic cooler.  
   
   
       5 . The passive heat-dissipating fan system as claimed in  claim 3 , wherein the hot-end passive heat-dissipating assembly is connected to the hot-end chamber, and the cold-end passive heat-dissipating assembly is connected to the cold-end chamber.  
   
   
       6 . The passive heat-dissipating fan system as claimed in  claim 5 , wherein the hot-end passive heat-dissipating assembly comprises a hot-end pipe and a hot-end passive fan, and the hot-end pipe has two ends connected to the hot-end chamber and the hot-end passive fan, respectively.  
   
   
       7 . The passive heat-dissipating fan system as claimed in  claim 6 , wherein the hot-end passive fan comprises a motor-free axial fan or a motor-free centrifugal fan.  
   
   
       8 . The passive heat-dissipating fan system as claimed in  claim 5 , wherein the cold-end passive heat-dissipating assembly comprises a cold-end pipe and a cold-end passive fan, wherein the cold-end pipe has two ends connected to the cold-end chamber and the cold-end passive fan, respectively.  
   
   
       9 . The passive heat-dissipating fan system as claimed in  claim 8 , wherein the cold-end passive fan comprises a motor-free axial fan or a motor-free centrifugal fan.  
   
   
       10 . The passive heat-dissipating fan system as claimed in  claim 3  further comprising a hot-end fin structure disposed on a surface of the hot end of the cooling device.  
   
   
       11 . The passive heat-dissipating fan system as claimed in  claim 3  further comprising a cold-end fin structure disposed on a surface of the cold end of the cooling device.  
   
   
       12 . An electronic system with a passive heat-dissipating fan system, comprising: 
 a housing;    an air-providing device disposed in the housing;    a cold-hot separation assembly connected to the air-providing device;    at least one hot-end passive heat-dissipating assembly connected to the cold-hot separation assembly; and    at least one cold-end passive heat-dissipating assembly connected to the cold-hot separation assembly; and    at least one electronic element corresponding to the cold-end passive heat-dissipating assembly, wherein when an airflow from the air-providing device passes through the cold-hot separation assembly, the airflow is separated, and then partially directed to the cold-end passive heat-dissipating assembly and partially directed to the hot-end passive heat-dissipating assembly.    
   
   
       13 . The electronic system as claimed in  claim 12 , wherein the hot-end passive heat-dissipating assembly comprises a hot-end pipe and a hot-end passive fan, wherein the hot-end pipe has two ends connected to the cold-hot separation assembly and the hot-end passive fan, respectively; and the cold-end passive heat-dissipating assembly comprises a cold-end pipe and a cold-end passive fan, wherein the cold-end pipe has two ends connected to the cold-hot separation assembly and the cold-end passive fan, respectively.  
   
   
       14 . The electronic system as claimed in  claim 13 , wherein the hot-end passive fan comprises a motor-free axial fan or a motor-free centrifugal fan, and the cold-end passive fan comprises a motor-free axial fan or a motor-free centrifugal fan.  
   
   
       15 . The electronic system as claimed in  claim 12 , wherein the air-providing device comprises an active fan and an air-providing pipe connected to the active fan, and the active fan comprises an axial fan or a centrifugal fan.  
   
   
       16 . The electronic system as claimed in  claim 12 , wherein the cold-hot separation assembly comprises a separation device having a separation element therein and a cooling device having a cold end and a hot end, wherein the cooling device is connected to the separation element and the cold and hot ends are respectively disposed on both sides of the separation element, and a hot-end chamber and a cold-end chamber are defined in the separation device by the separation element and the cooling device, wherein the hot end of the cooling device is disposed in the hot-end chamber and the cold end of the cooling device is disposed in the cold-end chamber.  
   
   
       17 . The electronic system as claimed in  claim 16 , wherein the cooling device comprises a thermal electric cooler or a thermoacoustic cooler.  
   
   
       18 . The electronic system as claimed in  claim 16 , wherein the hot-end passive heat-dissipating assembly is connected to the hot-end chamber, and the cold-end passive heat-dissipating assembly is connected to the cold-end chamber.  
   
   
       19 . The electronic system as claimed in  claim 16  further comprising a hot-end fin structure disposed on a surface of the hot end of the cooling device, and a cold-end fin structure disposed on a surface of the cold end of the cooling device.  
   
   
       20 . The electronic system as claimed in  claim 12  further comprising a fin structure disposed on a surface of the electronic element.