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  Liquid cooling apparatusUSPTO Application #: 20070068653Title: Liquid cooling apparatus Abstract: a liquid cooling apparatus provided on an apparatus having a heat unit generating heat, and configured to cool the heat unit by coolant includes; a coolant tank configured to store the coolant; a radiator configured to cool the coolant; and a coolant pipe which is a flow path of the coolant and connecting the coolant tank and the radiator. The coolant tank is arranged adjacent to the radiator in a horizontal direction when the apparatus disposed statically. A size of the coolant tank in a vertical direction is larger than a size of the coolant tank in a horizontal direction when the apparatus is disposed statically. (end of abstract) Agent: Ndq&m Watchstone LLP - Washington, DC, US Inventors: Nobuyuki Kondou, Takashi Miwa, Takashi Ikeda USPTO Applicaton #: 20070068653 - Class: 165080400 (USPTO) Related Patent Categories: Heat Exchange, With Retainer For Removable Article, Electrical Component, Liquid Cooled The Patent Description & Claims data below is from USPTO Patent Application 20070068653. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2005-282890, filed on Sep. 28, 2005; prior Japanese Patent Application No. 2006-053568, filed on Feb. 28, 2006; and prior Japanese Patent Application No. 2006-258960, filed on Sep. 25, 2006; the entire contents of which are incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a liquid cooling apparatus configured to cool a heat unit generating heat, by coolant. [0004] 2. Description of the Related Art [0005] A projection-type image display apparatus provided with a light source such as a lamp emitting the high brightness light and a projection lens projecting the light emitted from the light source on a screen is generally known. The projection type image display apparatus has a liquid cooling apparatus for cooling the light source by a coolant, for efficiently suppressing affection caused by heat that the light source generates. [0006] Specifically the liquid cooling apparatus has a flow path where the coolant flows and a radiator cooling the coolant warmed. The liquid cooling apparatus also has a reserve tank (hereinafter, upper reserve tank) for temporarily storing the coolant flowed into the radiator and a reserve tank (hereinafter lower reserve tank) for temporarily storing the coolant flowed out from the radiator. [0007] The liquid cooling apparatus will be described bellow with reference to FIG. 1. As shown in FIG. 1, the liquid cooling apparatus has pipe 23 connecting an object to be cooled 25 such as light source and a radiator 200. The object to be cooled 25 is cooled by circulating coolant through the pipe 23. As a pump 24 pump out the coolant into the pipe 23, the coolant circulates between the object to be cooled 25 and the radiator 200. [0008] The radiator 200 has inner radiator pipes 202 where the coolant passes through, and a heat radiation fin 203 cooling the coolant. The heat radiation fin 203 is cooled by the wind that blew to the heat radiation fin 203 from fan 206. [0009] The liquid cooling apparatus has an upper reserve tank 204 for temporarily storing the coolant flowed into the radiator and a lower reserve tank 205 for temporarily storing the coolant flowed out from the radiator. [0010] The upper reserve tank 204 is arranged on upper side of the radiator 200 and the lower reserve tank 205 is arranged on lower side of the radiator 200, assuming a vertical direction as an up-down direction when the projection-type image display apparatus disposed statically. Accordingly, a load of the pump 24 pumping out the coolant into the pipe 23 will be decreased. [0011] Since, a size of the projection-type image display apparatus in the up-down direction is restricted, sizes of the upper reserve tank 204 and the lower reserve tank 205 in the up-down direction are difficult to be enlarged. On the contrary, a capacity (a volume) of the upper reserve tank 204 and the lower reserve tank 205 need to be enlarged for saving enough amount of the stored coolant. [0012] Therefore, sizes of the upper reserve tank 204 and the lower reserve tank 205 in a left-right direction (horizontal direction) are generally larger than the sizes of the upper reserve tank 204 and the lower reserve tank 205 in the up-down direction (vertical direction). [0013] A coolant tank 201 storing the coolant is provided on upper side of the upper reserve tank 204, the coolant infused from an infusion opening. A layer of air is provided in upper portion of the coolant tank 201 to improve circulation characteristics of the coolant (for example, Unexamined Japanese Application No. 2002-357803). [0014] As the projection-type image display apparatus, projection-type image display apparatuses of hanging from ceiling type and of mobile type exist. In the projection-type image display apparatuses of hanging from ceiling type and of mobile type, since directions of the projection-type image display apparatuses are changeable, air may go into the pipe 23 or the like. As the air goes into the pipe 23, a flow amount of the coolant will be decreased. Accordingly, efficiency for cooling the object to be cooled 25 is deteriorated. [0015] Especially, in the upper reserve tank 204 described above, since the size in the up-down direction (vertical direction) is smaller than the size in the left-right direction (horizontal direction), the air will easily go into the pipe 23 when the direction of the projection-type image display apparatus (that is, the liquid cooling apparatus) varies. SUMMARY OF THE INVENTION [0016] An aspect of a liquid cooling apparatus provided on an apparatus having a heat unit generating heat, and configured to cool the heat unit by coolant includes; a coolant tank configured to store the coolant; a radiator configured to cool the coolant; and a coolant pipe which is a flow path of the coolant and connecting the coolant tank and the radiator. The coolant tank is arranged adjacent to the radiator in a horizontal direction when the apparatus disposed statically. A size of the coolant tank in a vertical direction is larger than a size of the coolant tank in a horizontal direction when the apparatus is disposed statically. [0017] "Disposing the apparatus statically" is to dispose the apparatus on the horizontal surface without leaning the apparatus. [0018] According this aspect, since the size of the coolant tank in a vertical direction is larger than the size of the coolant tank in a horizontal direction, the air merely goes into the coolant pipe, if the direction of the liquid cooling apparatus varies. The volume of the coolant tank can be sufficiently kept. [0019] In an aspect of the liquid cooling apparatus according to above described aspect, the coolant pipe connects to a center portion of the coolant tank in a vertical direction when the apparatus is disposed statically. [0020] According to this aspect, since the coolant pipe connects to a center portion of the coolant tank in a vertical direction, the air merely goes into the coolant pipe, if the liquid cooling apparatus is disposed upside down. [0021] In an aspect of the liquid cooling apparatus according to above described aspect, the coolant tank has a shape expanding from the center portion to upper side and expanding from the center portion to lower side, assuming a vertical direction as up-down direction when the apparatus is disposed statically. Continue reading... Full patent description for Liquid cooling apparatus Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Liquid cooling apparatus patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. 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