Abstract:
A radiation module capable of resisting reverse flow of hot fluid includes a fan, a radiator and a retaining tool. The fan provides an inlet and an outlet. The radiator is connected to the outlet of the fan. The retaining tool secures the radiator to a heat generation part. At least a baffle is provided in the radiation module. The fluid enters the fan via the inlet and flows toward the radiator via the outlet to cool the heat-generating component and the hot fluid moving outward the radiator is resisted entering the inlet with the baffle part so as to enhance heat dissipation efficiency.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention is related to a radiation module capable of resisting reverse flow of hot fluid. 
   2. Brief Description of the Related Art 
   Referring to  FIGS. 1 to 3 , the conventional radiation module includes a fan  14 , a radiator  15  and a retaining tool  16 . The heat-generating component  12  is disposed in a base seat  13  of a main board  11  and the base seat  13  is provided with a lock piece  131 , which extend outward from two opposite sides of the base seat  13  respectively. The radiator  15  is attached to the surface of the heat-generating component  12  with a plurality of cooling fins  151  in the radiator  15  being arranged in a way of being parallel to each other to form a plurality of flow passages  152  between the cooling fins  151  for being available for the fluid passing through. The retaining tool  16  fits with the radiator  15  and has a cover frame  161  with a stationary holding part  162  and a movable holding part  163  being oppositely disposed at two opposite lateral sides corresponding to the lock piece  131  at two opposite sides of the base seat  13  and a plurality of four through holes  164  being disposed at four corners of retaining tool  16 . The holding parts  162 ,  163  have an engaging hole  1621 ,  1631  to engage with the lock piece  131  such that the cover frame  161  can press the radiator  15  to closely contact with the surface of heat-generating component  12 . The fan  14  provides a frame  141  and a fan wheel  142 . The frame  141  has through holes  1411  corresponding to the through holes  164  at the cover frame  161  and provides an inlet  1412  and an outlet  1413  at two opposite sides thereof respectively with the outlet  1413  facing the radiator  15 . Four fasteners  17  pass through the through holes  1411  of the frame  141  and the through holes  164  of the cover frame  161  such that the fan  14  can be secured to the radiator  15  and the retaining tool  16 . 
   The fan  14  rotates to force the fluid to enter the fan  14  via the inlet  1412  and move toward the radiator  15  via the outlet  1413  and then flows outward via the flow passages  152  of the radiator  15 . The fluid becomes hot after passing through the radiator  15  due to heat transfer to heat in the radiator  15 . However, it is easy for the hot fluid around the radiator  15  to flow back to the fan  14  via the inlet  1412  while the fan  14  running. As a result, lower heat convection efficiency is obtained with lower heat dissipation efficiency. 
   SUMMARY OF THE INVENTION 
   An object of the present invention is to provide a radiation module capable of resisting [backward] reverse flow of hot fluid in which at least a baffle part is arranged to resist the hot fluid entering the fan via the inlet thereof again for enhancing the heat dissipation efficiency. 
   Another object of the present invention is to provide a radiation module capable of resisting reverse flow of hot fluid with which the life span of the heat-generating component can be extended. 
   A further object of the present invention is to provide a radiation module capable of resisting reverse flow of hot fluid in which the baffle [thereof] is made of sound absorptive material to attenuate noise decibel. 
   Accordingly, the radiation module capable of resisting reverse flow of hot fluid according to the present invention comprises a fan, a radiator and a retaining tool. The fan provides an inlet and an outlet. The radiator is disposed next to the outlet of the fan. The retaining tool secures the radiator to a heat-generating component. At least a baffle part is provided in the radiation module. The fluid enters the fan via the inlet and flows toward the radiator at the outlet to assist cooling the heat-generating component and the fluid, which becomes hot after passing through the radiator, can be resisted moving backward by means of the arrangement of the baffle part so as to enhance heat dissipation efficiency. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The detail structure, the applied principle, the function and the effectiveness of the present invention can be more fully understood with reference to the following description and accompanying drawings, in which: 
       FIG. 1  is an exploded perspective view of the conventional radiation module; 
       FIG. 2  is an assembled perspective view of the conventional radiation module; 
       FIG. 3  is a sectional view of the conventional radiation module illustrating operation thereof; 
       FIG. 4  is an exploded perspective view of the first embodiment of a radiation module capable of resisting reverse flow of hot fluid according to the present invention; 
       FIG. 5  is an assembled perspective view of the first embodiment according to the present invention; 
       FIG. 6  is a sectional view of the first embodiment according to the present invention illustrating operation thereof; 
       FIG. 7  is an exploded perspective view of the second embodiment of a radiation module capable of resisting reverse flow of hot fluid according to the present invention; 
       FIG. 8  is an assembled perspective view of the second embodiment according to the present invention; 
       FIG. 9  is a sectional view of the second embodiment according to the present invention illustrating operation thereof; 
       FIG. 10  is an exploded perspective view of the third embodiment of a radiation module capable of resisting reverse flow of hot fluid according to the present invention; 
       FIG. 11  is an assembled perspective view of the third embodiment according to the present invention; 
       FIG. 12  is a sectional view of the third embodiment according to the present invention illustrating operation thereof. 
       FIG. 13  is an assembled perspective view of the fourth embodiment of a radiation module capable of resisting reverse flow of hot fluid according to the present invention; 
       FIG. 14  is an exploded perspective view of the fifth embodiment of a radiation module capable of resisting reverse flow of hot fluid according to the present invention; 
       FIG. 15  is an assembled perspective view of the fifth embodiment of a radiation module capable of resisting reverse flow of hot fluid according to the present invention; 
       FIG. 16  is a plan view illustrating another type of the baffle in the preceding embodiments; 
       FIG. 17  is a plan view illustrating a further type of the baffle in the preceding embodiments; 
       FIG. 18  is a plan view illustrating a further type of the baffle in the preceding embodiments; 
       FIG. 19  is a plan view illustrating a further type of the baffle in the preceding embodiments; 
       FIG. 20  is a plan view illustrating a further type of the baffle in the preceding embodiments; and 
       FIG. 21  is a plan view illustrating a further type of the baffle in the preceding embodiments. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
   Referring to  FIGS. 4 and 5 , the first embodiment of a radiation module capable of resisting reverse flow of hot fluid according to the present invention includes a radiation module and a heat-generating component  24 . The radiation module comprises a fan  21 , a radiator  23  and a retaining tool  22 . The fan  21  further comprises a fan frame  211  and a fan wheel  212 . The fan frame  211  provides an inlet  2111  and an outlet  2112 . The fan frame  211  has through holes  213  at four corners thereof for being passed through with fasteners  27  and has a baffle part  214  extending outward from periphery of the inlet  2111  of the fan frame  211 . The radiator  23  has a plurality of cooling fins  231  being arranged in parallel to each other and upright from the bottom of the radiator  23  with a flow passage  232  between adjacent cooling fins  231  for fluid flowing through. The retaining tool  22  has a central opening  221  with four corners thereof having through holes  222  corresponding to the though holes  213  of the fan  21  for the fan  21  being secured to the retaining tool  22  and the radiator  23 . A lateral side of the retaining tool  22  extends downward a holding part  223  and another lateral side of the retaining tool  22  has a slot opposite to the holding part  23  for locating a detachable holding part  224 . The lower ends of the holding parts  223 ,  224  have an engaging hole  2231 ,  2241  respectively and the holding part  224  is movably attached to the retaining tool  22 . The heat-generating component  24  is disposed in a base seat  26  of a main board  25  and the base seat  26  is a frame for receiving the radiator  23  with a locking piece  261  jutting out two opposite sides of the base seat  26  for engaging with the engaging holes  224 . 
   The heat-generating component  24  is placed in the base seat  26  of the main board  25  and the radiator  23  of the radiation module is closely attached to the surface of the heat-generating component  24 . Then, the holding parts  223 ,  224  at two lateral sides of retaining tool  22  are arranged to be perpendicular to both lateral sides of the base seat  26  and the engaging holes  2231 ,  2241  of the holding parts  223 ,  224  engage with the lock pieces  261  of the base seat  26  such that the retaining tool  22  can secure the radiator  23  to the heat-generating component  24  to allow the outlet  2112  of the fan  21  is on the retaining tool  22 . Then, the fasteners  27  pass through the through holes  213  of the fan frame  211  and through holes  222  of the retaining tool  22  to allow the fan  21  being joined to the radiator  23  and the retaining tool  22 . Further, the baffle part  214  extends along two opposite directions to exceed both lateral ends of the respective flow passage  232 . 
   Referring to  FIG. 6 , when the fan  21  rotates, the fluid is forced to enter the fan  21  via the inlet  2111  and flows toward the radiator  23  via the outlet  2112 . When the fluid passes through the radiator  23 , which transmits heat of the heat-generating component  24 , heat transfer between the fluid and the cooling fins  231  is performed to increase temperature of the fluid. Afterwards, the hot fluid flows out via two lateral ends of the respective flow passage  232 . Besides, the baffle part  214  resists the hot fluid flowing back to the inlet  2111  of the fan  21  to avoid lower convection efficiency. Hence, the disadvantage of the conventional radiation module is overcome such that heat dissipation efficiency of the radiation module can be enhanced and life span of the heat-generating component  24  can be prolonged. 
   The baffle part  214  can be made integrally with the fan  21  or can be a separate unit from the fan  21 . 
   Referring to  FIGS. 7 to 9 , the second embodiment of the present invention is illustrated. The entire structure and function of radiation module in the second embodiment is almost the same as first embodiment and it is noted the identical parts and reference numbers will not be described in detail. The difference of the second embodiment is in that the baffle part  314  extends from two opposite sides of the retaining tool  22  instead of extending from the fan frame  211  and the baffle part  214  can be made integrally with the retaining tool  22  or can be a separate unit from the retaining tool  22 . 
   Referring to  FIGS. 10 to 12 , the third embodiment of the present invention is illustrated. The entire structure and function of radiation module in the third embodiment is almost the same as the preceding embodiments and it is noted the identical parts and reference numbers will not be described in detail. The difference of the third embodiment is in that the baffle part  414  extends outward from two opposite upper lateral edges of the cooling fins  231  respectively in a way of being perpendicular and intersecting to both lateral ends of the respective flow passage  232 . The baffle part  414  can be made integrally with the radiator  23  or can be a separate unit from the radiator  23 . 
   Referring to  FIG. 13 , the fourth embodiment of the present invention is illustrated. The entire structure and function of radiation module in the fourth embodiment is almost the same as the preceding embodiments and it is noted the identical parts and reference numbers will not be described in detail. The difference of the fourth embodiment from the third embodiment is in that the baffle part  514  provides a side wall  5141  at the two lateral sides thereof respectively and the side wall  5141  is parallel and adjacent with the cooling fins  231  of the radiator  23 . The baffle part  414  can be made integrally with the radiator  23  or can be a separate unit from the radiator  23 . 
   Referring to  FIGS. 14 and 15 , the fifth embodiment of the present invention is illustrated. The entire structure and function of radiation module in the third embodiment is almost the same as the preceding embodiments and it is noted the identical parts and reference numbers will not be described in detail. The difference of the fifth embodiment from the previous embodiments is in that the radiator  63  is cylindrical with the cooling fins  631  extending outward radially with radial shaped flow passages  632  between the cooling fins  631 . The retaining tool  62  is annular to correspond to the cylindrical radiator  63  and the base seat  66  of the main board  25  is annular to correspond to the radiator  63  too. The baffle part  614  extends outward from the bottom of the fan frame  211  with a circular periphery shape and diameter of the baffle part  614  is greater than diameter of the cylindrical radiator  63  such that the hot fluid moving outward the flow passages  632  is resisted to flow back to the inlet  2111 . 
   Referring to  FIGS. 16 to 21 , the baffle parts  214 ,  314 ,  414 ,  514 ,  614  in the preceding embodiments can be any shape such as being semicircular shown in  FIG. 16 , semi-ellipse shown in  FIG. 17 , trapezoidal as shown in  FIG. 18 , pentagon as shown in  FIG. 19 , hexagon as shown in  FIG. 20 , irregular shape as shown in  FIG. 21 . Besides, the baffle part  214 ,  314 ,  414 ,  514 ,  614  can be made of sound absorptive material to absorb noise resulting from running fan  21  and fluid flowing so as to reduce the sound decibel of the entire radiation module. 
   While the invention has been described with referencing to preferred embodiments thereof, it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention, which is defined by the appended claims.