Fan guard structure for additional supercharging function

Abstract

A fan guard has a function of supercharging a fan in addition to supporting a rotor device is disclosed. The fan guard is to be mounted beside the rotor device for supporting the rotor device, and additionally, the fan guard interacts with an airflow generated by the revolution of the rotor blades to supercharge the fan. The fan guard essentially includes a main frame, and a set of guard blades radially arranged inside the main frame and fixed onto an inner surface of the main frame by each one end thereof. Each of the guard blades is preferred to have a shape similar to the shape of the rotor blades, and the set of guard blades can be arranged either upstream or downstream of the rotor blades.

1. A fan guard to be mounted beside a rotor device of a heat-dissipation fan for supporting said rotor device and supercharging said fan, comprising:
 a main frame;  
 a first set of guard blades radially arranged inside said main frame and , fixed onto an inner surface of said main frame by one ends  end thereof, and respectively having a radially curved profile;  
 a motor holder disposed inside said main frame for receiving and supporting a motor for driving the rotor device and enabling said motor to be received in a shaft ring of said rotor device; and  
 a second frame and a second set of guard blades arranged upstream of said rotor blades to guide air into said rotor device at an angle so as to make an air inflow to said rotor device have an additional tangential velocity, and thus enhance the work of said rotor blades on air;  
 wherein said first set of guard blades are arranged downstream of rotor blades of said rotor device, and have a shape substantially identical to that of said rotor blades, and an arrangement relative to said rotor blades allowing any one of said guard blades and any one of said rotor blades to constitute an approximate C configuration in a cross-sectional view at a moment that a leading point of said guard blade aligned with a trailing point of said rotor blade in an axial direction, and wherein curves of said downstream guard blades guide an overall air outflow from said rotor device to penetrate therethrough and be outputted in said axial direction, thereby transforming a tangential velocity of said air outflow from said rotor device into a static pressure to supercharge said fan.  
 
     
     
       2. The fan guard according to  claim 1  further comprising a  wherein said motor holder which is  comprises a hollow cylinder substantially located at the center of said main frame, and fixed thereto the other ends of said first set of guard blades for receiving therein a motor used for driving said rotor blades to revolve. 
     
     
       3. The fan guard according to  claim 1  further comprising at least one reinforcing ring connecting all of said guard blades for strengthening said fan guard. 
     
     
       4. The fan guard according to  claim 1  wherein said guard blades are made of a material selected from a group consisting of a plastic and a metal. 
     
     
       5. A fan guard for supporting a rotor device of a heat dissipation fan in order to supercharge said fan, comprising:
 an integrally formed main frame for accommodating therein said rotor device;    a cylindrical motor holder disposed inside said main frame for receiving and supporting a motor used for driving said rotor blades to revolve and enabling said motor to be received in a shaft ring of said rotor device and positioned between the shaft ring and the motor holder; and    a plurality of guard blades radially arranged inside said main frame, fixed onto an inner surface of said main frame by each end thereof, and respectively having different crosssections;    wherein said guard blades have a shape substantially similar to that of rotor blades of said rotor device, and said guard blades and said rotor blades are arranged in a specific configuration for allowing a tangential velocity of an airflow to be transformed into a static pressure so as to supercharge said fan.   
     
     
       6. The fan guard according to  claim 5  wherein said guard blades are arranged downstream of said rotor blades. 
     
     
       7. The fan guard according to  claim 6  further comprising another set of guard blades accommodated in said main frame and arranged upstream of said rotor blades. 
     
     
       8. The fan guard according to  claim 5  wherein said guard blades are arranged upstream of said rotor blades. 
     
     
       9. The fan guard according to  claim 5  wherein a count of said guard blades is about  1 ˜ 2  times of that of said rotor blades. 
     
     
       10. The fan guard according to  claim 5  wherein said guard blades are made of plastic or metal. 
     
     
       11. The fan guard according to  claim 5  further comprising at least one reinforcing ring connecting all of said guard blades for strengthening said fan guard. 
     
     
       12. A heat dissipation fan comprising:
 a fan guard having a main frame, and a plurality of guard blades radially arranged inside said main frame, fixed onto an inner surface of said main frame by each end thereof, and respectively having a curved profile with a cross-sectional width that varies along a substantial portion of a chord of the guard blade;    a rotor device mounted inside said main frame and having a shaft ring and a plurality of rotor blades;    a motor holder for receiving and supporting a motor used for driving said rotor device to revolve and allowing said motor to be received in said shaft ring and positioned between the shaft ring and the motor holder;    wherein said guard blades have a shape substantially similar to that of said rotor blades, and are arranged relative to said rotor blades for allowing a tangential velocity of an airflow to be transformed into a static pressure so as to supercharge said fan.   
     
     
       13. The heat dissipation fan according to  claim 12  wherein said motor holder is a hollow cylinder substantially located at the center of said main frame, and effecting a junction with the other ends of said guard blades. 
     
     
       14. The heat dissipation fan according to  claim 12  further comprising at least one reinforcing ring connecting all of said guard blades for strengthening said fan guard. 
     
     
       15. The heat dissipation fan according to  claim 12  wherein said guard blades are arranged upstream of said rotor blades of said rotor device. 
     
     
       16. The heat dissipation fan according to  claim 12  wherein said guard blades are arranged downstream of said rotor blades of said rotor device. 
     
     
       17. A composite heat-dissipating fan comprising:
 a fan guard having a main frame and a plurality of guard blades radially arranged inside said main frame, fixed onto an inner surface of said main frame by each end thereof, and respectively having a crosssection that varies along a substantial portion of a chord of the guard blade;    a first rotor device having a frame and a plurality of rotor blades, wherein said guard blades are optionally arranged upstream or downstream of said rotor blades of said first rotor device; and    a second rotor device arranged upstream of said fan guard and said first rotor device which is arranged downstream of said fan guard, wherein said main frame of said fan guard, said frame of said first rotor device and a frame of said second rotor device are assembled by screwing;    wherein said guard blades have a shape substantially similar to that of rotor blades of said first rotor device, and are arranged relative to said rotor blades of said first rotor device for allowing a tangential velocity of an airflow to be transformed into a static pressure so as to supercharge said fan.   
     
     
       18. The composite heat-dissipating fan according to  claim 17  wherein said fan guard further comprises a motor holder which is a hollow cylinder substantially located at the center of said main frame, and effecting a junction with the other ends of said guard blades for receiving therein a motor used for driving said rotor blades to revolve. 
     
     
       19. The composite heat-dissipating fan according to  claim 17  further comprising at least one reinforcing ring connecting all of said guard blades for strengthening said fan guard. 
     
     
       20. The composite heat-dissipating fan according to  claim 17  wherein said main frame of said fan guard and said frame of said first rotor device are integrally formed together. 
     
     
       21. The composite heat-dissipating fan according to  claim 17  wherein said guard blades are configured and arranged to simultaneously enhance efficiencies of said first rotor device and said second rotor device. 
     
     
       22. A fan guard for supporting a rotor device of a heat dissipation fan in order to supercharge said fan, comprising:
 a main frame;    a plurality of guard blades radially arranged inside said main frame;    a holder located inside said main frame and integrally formed with said main frame and said guard blades as a monolithic piece for receiving and supporting a motor used for driving said rotor device to revolve;    wherein said guard blades have a shape that is substantially similar to that of rotor blades of said rotor device and that has a radially curved profile, and said guard blades and said rotor blades are arranged in a specific configuration for allowing a tangential velocity of an airflow to be transformed into a static pressure so as to supercharge said fan.   
     
     
       23. A heat dissipation fan comprising:
 a rotor device having a motor and a plurality of rotor blades;    a fan guard having a frame surrounding said rotor device and a motor holder receiving and supporting said motor;    a set of guard blades radially disposed between said frame and said motor holder, respectively having a cross-section that varies along a substantial portion of a chord of the guard blade, and integrally formed with said motor holder and said frame of said fan guard together as a monolithic piece;    said guard blades and said rotor blades having a substantially similar shape relative to one another and being curved in different directions for allowing a tangential velocity of an airflow resulting from a revolution of said rotor blades to be transformed into a static pressure so as to supercharge said fan.   
     
     
       24. A composite heat-dissipating fan comprising:
 a main frame;    a first rotor device disposed in said main frame and having a shaft ring, a motor and a plurality of rotor blades arranged around said shaft ring;    a fan guard having a frame, a motor holder for receiving and supporting said motor and enabling said motor to be received in said shaft ring of said first rotor device and positioned between the shaft ring and the motor holder, and a plurality of guard blades radially disposed between said frame and said motor holder and respectively having a curved profile with a cross-section that varies along a substantial portion of a chord of the guard blade;    wherein said guard blades and said rotor blades have a substantially similar shape relative to one another and are relatively arranged for allowing a tangential velocity of an airflow resulting from a revolution of said rotor blades to be transformed into a static pressure so as to supercharge said fan.   
     
     
       25. The composite heat-dissipating fan of  claim 24  wherein said guard blades are arranged on an inlet side of said first rotor device. 
     
     
       26. The composite heat-dissipating fan of  claim 24  wherein said guard blades are arranged on an outlet side of said first rotor device. 
     
     
       27. The composite heat-dissipating fan of  claim 24  wherein said motor holder is a cup-shaped cylinder substantially located at the center of said frame of said fan guard, and integrally formed with said guard blades and said frame of said fan guard together. 
     
     
       28. The composite heat-dissipating fan according to  claim 24  further comprising at least one reinforcing ring connecting all of said guard blades for strengthening said fan guard. 
     
     
       29. The composite heat-dissipating fan according to  claim 24  further comprising a second rotor device having a frame and a plurality of rotor blades. 
     
     
       30. The composite heat-dissipating fan according to  claim 29  wherein said first rotor device, said second rotor device, and said fan guard are assembled in series. 
     
     
       31. The composite heat-dissipating fan according to  claim 29  wherein said first rotor device and said second rotor device are disposed on two opposite sides of said fan guard. 
     
     
       32. The composite heat-dissipating fan according to  claim 31  wherein said main frame of said first rotor device, said frame of said second rotor device, and said frame of said fan guard are integrally formed together. 
     
     
       33. A composite heat-dissipating fan comprising:
 a first fan unit having a frame, a plurality of rotor blades, and a fan guard with a plurality of guard blades respectively having a cross-section that varies along a substantial portion of a chord of the blade and curved in a direction different from that of said rotor blades of said first fan unit for transforming an intake airflow into a static pressure to supercharge said first fan unit; and    a second fan unit having a frame, a plurality of rotor blades, and a fan guard with a plurality of guard blades respectively having a cross-section that varies along a substantial portion of a chord of the blade and curved in a direction different from that of said rotor blades of said second fan unit for transforming an intake airflow into a static pressure to supercharge said second fan unit;    wherein said first fan unit and said second fan unit are assembled together.   
     
     
       34. The composite heat-dissipating fan according to  claim 33  wherein said first fan unit and said second fan unit are connected in series. 
     
     
       35. The composite heat-dissipating fan according to  claim 33  wherein said plurality of rotor blades and said plurality of guard blades of said first fan unit and said plurality of rotor blades and said plurality of guard blades of said second fan unit are alternately arranged in series. 
     
     
       36. The composite heat-dissipating fan according to  claim 33  wherein said first fan unit and second fan unit are assembled by screwing. 
     
     
       37. The composite heat-dissipating fan according to  claim 33  wherein said plurality of guard blades of said first fan unit and said plurality of guard blades of said second fan unit have inclined angles, respectively. 
     
     
       38. The composite heat-dissipating fan according to  claim 33  wherein said first and second fan units further comprise at least one reinforcing ring connecting all of said guard blades for strengthening said fan guard thereof, respectively. 
     
     
       39. A heat dissipation fan comprising:
 a rotor device having a motor and a plurality of rotor blades;    a fan guard having a frame surrounding said rotor device, a motor holder receiving and supporting said motor, and a plurality of guard blades radially disposed between said motor holder and said frame and respectively having a crosssection that varies along a substantial portion of a chord of the guard blade;    wherein said guard blades and said rotor blades have a substantially similar shape relative to one another and are close to each other enough to allow a tangential velocity of an airflow resulting from a revolution of said rotor blades to be transformed into a static pressure so as to supercharge said fan.   
     
     
       40. The heat dissipation fan of  claim 39  wherein said frame, said motor holder, and said guard blades of said fan guard are integrally formed as a single piece. 
     
     
       41. The heat dissipation fan according to  claim 39  wherein said plurality of guard blades have inclined angles, respectively. 
     
     
       42. The heat dissipation fan according to  claim 39  further comprising at least one reinforcing ring connecting all of said guard blades for strengthening said fan guard thereof, respectively.