Patent Publication Number: US-2005133201-A1

Title: Radiation fin structure

Description:
FIELD OF THE INVENTION  
      The present invention relates to a radiation fin structure for improving heat dissipation.  
     BACKGROUND OF THE INVENTION  
      The radiator for personal computers or notebook computers generally has a fan fixedly mounted onto the radiation fins. The radiation fins are clamped on a computer heat generating element through an eccentric fixture. During heat dissipation process, the eccentric fixture is prone to skew and results in the radiation fins not in direct contact with the computer heat generating element. Therefore heat generated by the computer heat generating element concentrates on the contact surface, while airflow generated by the fan does not blow in a converged fashion but around the surrounding. Moreover, the radiation fins simply rely on metal thermal conduction principle to disperse heat. Namely, the computer heat generating element transfers heat through the contact surface to the base deck of the radiator. Then the heat is transferred to the radiation fins to be carried away by the airflow generated by the fan. The heat dissipation efficiency of such an approach is determined by the thermal conductivity power of the metal that is used to fabricate the radiator. As solid substance has limited thermal conductivity power, heat dissipation effect of the known radiator also is limited. To remedy this problem, the present invention provides a closed chamber structure that is filled with a liquid or gas heat dissipation medium. It maintains the original metal thermal conductive heat dissipation approach, also includes a medium convection heat dissipation approach. Therefore heat dissipation effect may be improved.  
     SUMMARY OF THE INVENTION  
      In view of the aforesaid disadvantages occurred to the conventional radiation fins that do not provide desirable heat dissipation effect, applicant aims to provide an improved radiation fin structure that has a base deck which has a closed loop consisting of grid type passages. The closed loop is filled with a liquid or gas heat dissipation medium to the amount about 50% to 90% of the internal volume capacity of the grid type passages. Heat concentrates on a heat absorption end of the base deck and passes through the radiation fins to be dispelled by the fan to achieve heat dissipation effect.  
      The structure set forth can achieve the following advantages:  
      1. The base deck at the bottom end of the radiation fins has grid type passages to form a closed loop to contain a liquid or gas heat dissipation medium. It maintains the original metal thermal conductive heat dissipation approach, also includes a medium convection heat dissipation approach. Therefore heat dissipation effect may be improved.  
      2. The radiation fin structure according to the invention consists of aluminum radiation fins with a closed loop formed therein. Heat on the contact surface of the heat generating element (at a higher temperature) concentrates on the heat absorption end of the base deck, and passes through the radiation fins to be dispelled by the fan. Thus heat dissipation effect may be improved.  
      3. The radiation fins of the invention are in contact with the contact surface of the heat generating element so that the heat absorption end of the base deck at the bottom can converge heat which passes through the radiation fins to be dispelled by the fan. The contact area is evenly formed and has an improved heat conduction coefficient. This also can enhance heat dissipation effect.  
      The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1  is a perspective view of a first embodiment of the present invention.  
       FIG. 2  is a front view of  FIG. 1 .  
       FIG. 3  is a schematic view of circulating heat dissipation by the heat dissipation medium according to  FIG. 1 .  
       FIG. 4  is a schematic view of circulating heat dissipation by the heat dissipation medium according to a second embodiment of the invention.  
       FIG. 5  is a schematic view of circulating heat dissipation by the heat dissipation medium according to a third embodiment of the invention.  
       FIG. 6  is a schematic view of circulating heat dissipation by the heat dissipation medium according to a fourth embodiment of the invention.  
       FIG. 7  is a perspective view of a fifth embodiment of the invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
      Please refer to  FIGS. 1 and 2  for a first embodiment of the invention. The radiation fin structure according to the invention includes a base deck  10  and a fin-type heat dissipation section  11 . It is adopted for use on personal computers or notebook computers and peripheral devices thereof for dispersing heat.  
      The base deck  10  is in contact with a heat generating element of a computer to absorb heat. The base deck  10  has grid type passages  102  formed therein that consist of longitudinal and transverse passages on neighboring sides communicating with one another to form a closed loop  100 . The closed loop  100  is filled with a liquid or gas heat dissipation medium  101  to the amount about 50% to 90% of the internal volume capacity of the grid type passages  102  (shown by arrows in  FIG. 3 ).  
      The fin-type heat dissipation section  11  is located above the base deck  10  which has a heat absorption end to absorb heat and transfer the heat through the fin-type heat dissipation section  11  to be dispelled by a fan.  
      Referring to  FIG. 3 , the grid type passages  102  are formed in the base deck  10 . They have outlets sealed by pliable plugs  103 . The grid type passages  102  form a closed loop  100  which is filled with a liquid or gas heat dissipation medium  101  to the amount about 50% to 90% of the internal volume capacity of the grid type passages  102  (shown by arrows in  FIG. 3 ). When the base deck  10  is in contact with the contact surface of the computer heat generating element, the heat dissipation medium  101  in the base deck  10  gathers heat generated by the computer heat generating element to the heat absorption end of the base deck  10 , then the heat is transferred to the fin-type heat dissipation section  11  to be dispelled by the fan to achieve optimal heat dissipation effect.  
      Refer to  FIG. 4  for a second embodiment of the invention. It is constructed largely like the first embodiment shown in  FIG. 1 . The difference is that reciprocal passages  102   a  are formed by machining in the base deck  10   a  at the bottom end of the radiation fins with outlets sealed by pliable plugs  103   a . The reciprocal passages  102   a  form a closed loop  100   a  which is filled with a liquid or gas heat dissipation medium  101  to the amount about 50% to 90% of the internal volume capacity of the reciprocal passages  102   a  (shown by arrows in  FIG. 4 ). When the base deck  10   a  is in contact with the contact surface of the computer heat generating element, heat concentrates on the heat absorption end of the base deck  10   a , and is transferred to the fin-type heat dissipation section to be dispelled by the fan to achieve optimal heat dissipation effect.  
      Refer to  FIG. 5  for a third embodiment of the invention. It is constructed largely like the first embodiment shown in  FIG. 1 . The difference is that the grid type passages  102   b  fabricated by machining in the base deck  10   b  with outlets sealed by pliable plugs  103   b  form an open-type loop  10   b . The base deck  10   b  has an outlet connection end  104   b  on one side and an inlet connection end  105   b  on another side thereof to form a circulation system. When the base deck  10   b  is in contact with the contact surface of the computer heat generating element, heat concentrates on the heat absorption end of the base deck  10   b , and is exchanged through an external heat exchanger, then is transferred to the fin-type heat dissipation section to be dispelled by the fan to achieve optimal heat dissipation effect.  
      Refer to  FIG. 6  for a fourth embodiment of the invention. It is constructed largely like the third embodiment shown in  FIG. 5 . The difference is that a reciprocal loop  100   c  is formed in the base deck  10   c . The reciprocal loop  100   c  may be connected to an external heat exchanger, then is transferred to the fin-type heat dissipation section to dispel heat by the fan.  
      Refer to  FIG. 7  for a fifth embodiment of the invention. It is constructed largely like the first embodiment shown in  FIG. 1 . The difference is that the radiation fins  1   d  are to be housed in the heat generating space. While it has a base deck  10   d  with the same height as the one in the embodiment shown in  FIG. 1 , the radiation fins  1   d  located above the base deck  10   d  are formed with different heights and arranged in different densities.