Patent Application
20070246199
The present invention relates to a heat dispensing assembly with axial fan and heat exchanging tube for quickly removing heat from heat source.
A conventional heat dispensing device 10 used for removing heat from heat source such as CPU of computers to prevent from damage to the electronic parts due to high temperature is shown in
Due to the size of the electronic appliance becomes more compact than ever, the heat dispensing device 10 is required to be thin and small. However, the axial fan 1 is installed above the radiator 2 and includes a motor 11 to drive the blades 12 of the fan 1 so that the thickness of the whole heat dispensing device cannot meet the requirement for the modern electronic appliance. Besides, the air flows generated by the axial fan 1 is swirl flows which cannot reach to every gaps between the fins 22 and the flows cannot reach the center of the radiator 2 either so that the efficiency for bringing heat out from the heat source is less satisfied.
The present invention intends to provide a heat dispensing assembly which includes a hollow heat exchanging tube in which a heat exchangeable substance is received so that the heat can be more efficiently removed from the heat source by air flows.
The present invention relates to a heat dispensing assembly which comprises a base having an outlet is defined in a side of the base. A cover is mounted on the base and has an inlet. A centrifugal fan is eccentrically received in the base and includes a blade unit which is driven by a motor. A heat exchanging unit has a plurality of fins located around the centrifugal fan. A heat exchanging tube is received in the base and a heat exchangeable substance is received in the heat exchanging tube.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.
Referring to FIGS. 3 to 6, the heat dispensing assembly of the present invention comprises a base 41 having a groove 411 defined in an inner top thereof and an extension tube extends from a side of the base 41 and an outlet 43 is defined through the extension tube. A cover 42 is mounted on the base 41 and has an inlet 421 which communicates with an interior of the base 41. A centrifugal fan 4 is eccentrically received in the base 41 and includes a blade unit 46 which is located corresponding to the through hole 411. The blade unit 46 is driven by a motor 44 which is enclosed by a bush 45 and connected to the blade unit 46.
A heat exchanging unit 5 has a plurality of fins 51 which are located around the centrifugal fan 4. A copper made heat exchanging tube 52 is engaged with the groove 411 of the base 41 and a heat exchangeable substance, such as water, is received in the heat exchanging tube 52. The heat exchanging tube 52 is vacuumed first and water is then filled into the heat exchanging tube 52. It is noted that the vaporization temperature and the due point of the water under lower pressure will be lowered so that the water can be easily vaporized by absorbing heat and then cooled down when the heat is removed. The heat exchanging tube 52 is a substantially horseshoe-shaped tube including two open ends 522 connected between an enclosed section 521. The enclosed section 521 is located higher than the two open ends 522 which extend out from the base 41 so as to be connected to a heat source such as a CPU or chip (not shown). The fins 51 are located to enclose the blade unit 46 and in contact with the heat exchanging tube 52.
When the heat form the heat source is transferred to the heat exchanging tube 52 from the two open ends of the heat exchanging tube 52, the water in the heat exchanging tube 52 is easily vaporized by absorbing heat and flow toward the enclosed section 521 which is located higher than the open ends 522. The heat is transferred to the fins 51 during the vaporized water moving toward the enclosed section 521. The blade unit 46 generates air flows to bring the heat out from the outlet 43. The vaporized water is then cooled when the heat is removed and then flows toward the open ends 522 again to absorb heat again. Therefore, the heat is exchanged during the movement of the different phases of the water in the heat exchanging tube 52. By this way, the heat of the heat source can be efficiently removed.
The heat exchanging unit 5 is connected to the centrifugal fan 4 so that the whole heat dispensing assembly occupies only a small space and can be used in modern electronic appliances. The open ends 522 of the heat exchanging tube 52 are directly connected to the heat source and the enclosed section 521 is located higher than the open ends 522 so that the water in the heat exchanging tube 52 can easily flow and the heat can be moved efficiently.
While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
