Patent ID: 6364003
Filing Date: 2002-04-02
Classification: F28D,F28F,G06F,H01L

Abstract:
A miniature heat absorbing and radiating device having a driving unit for pushing two different fluids alternately, comprising:a first driving unit including a chamber, an active magnet, a pair of fixed magnets, and a pair of passive magnets; said chamber being a tube having predetermined shape, length and internal space; said active magnet having a predetermined length and an exterior shape corresponding to an interior shape of said chamber, and being adapted to reciprocatingly move within a middle section of said chamber; a coil being provided around an outer wall of said chamber at a portion corresponding to said active magnet to electrically connected to a circuit and thereby obtain from said circuit a cyclically variable current direction for said active magnet to reciprocate in said chamber; said pair of fixed magnets being separately fixedly located at and spaced from two ends of said active magnet by a predetermined distance, and each said fixed magnet having a predetermined length and an exterior shape corresponding to the interior shape of said chamber; said pair of passive magnets being separately located and reciprocatingly movable between said active magnet and each said fixed magnet, and each said passive magnet having a predetermined length and an exterior shape corresponding to the interior shape of said chamber; said active magnet, said fixed magnets and said passive magnets being so arranged that ends thereof having the same polarity are located at the same side; said chamber being provided on its wall at portions between said active magnet and one of said fixed magnets with a pair of first fluid outlets and a pair of second fluid inlets, such that when said active magnet reciprocates in said chamber and causes one of said passive magnet corresponding to said fixed magnet to move reciprocatingly, the following conditions are observed: (A) When said passive magnet is moved leftward to reach a maximum displacement thereof, only one of said first fluid outlets that is located between said active magnet and said passive magnet is opened; (B) When said passive magnet is moved rightward not to reach a maximum displacement thereof, one of said first fluid outlets that is located between said fixed magnet and said passive magnet as well as one of said second fluid inlets that is located between said active magnet and said passive magnet are opened, while another said first fluid outlet and another said second fluid inlet are closed; and (C) When said passive magnet is moved rightward to reach a maximum displacement thereof, only said first fluid outlet that is located between said active magnet and said passive magnet is closed; said chamber being also provided on its wall at positions between said active magnet and another said fixed magnet with a pair of third fluid outlets and a pair of fourth fluid inlets, such that when said active magnet reciprocates in said chamber and causes another said passive magnet to move reciprocatingly, the following conditions are observed: (D) When said passive magnet is moved leftward to reach a maximum displacement thereof, as previously described in (A), only one of said third fluid outlets that is located between said active magnet and another said passive magnet is closed; (E) When said passive magnet is moved rightward not to reach a maximum displacement thereof, as previously described in (B), only another said third fluid outlet that is located between another said fixed magnet and another said passive magnet is opened; and (F) When said passive magnet is moved rightward to reach a maximum displacement thereof, as previously described in (C), only said third fluid outlet 54 that is located between said active magnet and another said passive magnet is opened; a first communicating tube being provided to extend from said first fluid outlet between said fixed magnet and said passive magnet to said fourth fluid inlet between another said passive magnet and another said fixed magnet, in order to transfer a first fluid provided in said chamber; and a second communicating tube being provided to extend from another said first fluid outlet between said active magnet and said passive magnet to another said fourth fluid inlet between said active magnet and another said passive magnet, in order to transfer a second fluid provided in said chamber; a heat-exchange unit including at least an expansion tube having a predetermined length; said expansion tube being communicably connected at an end to said pair of third fluid outlets, and an outer side of said expansion tube being pressed against a heat source; a liquid-gas confluence unit being in the form of a tube having a predetermined length and communicably connected at an end to the other end of said expansion tube; and a liquid-gas separation chamber having a predetermined internal space and being communicably connected to another end of said liquid-gas confluence unit and to said second fluid inlets between said active magnet and said passive magnet, and said liquid-gas separation chamber being provided on its wall with an opening covered with a thin venting layer.