WATER PILLOW FOR HEAT RADIATION
According to a water pillow for heat radiation for touching a heat generating object, absorbing heat from the heat generating object and radiating heat by cooling liquid that circulates inside the water pillow, said device includes an inflow inlet for flowing the cooling liquid inside the water pillow, a drain outlet for flowing the cooling liquid out of inside the water pillow, a plurality of cooling fins spoke wise disposed on a first plane constituting a cavity inside the water pillow where the cooling liquid circulates and an impeller for circulating in a whirl the cooling liquid disposed on a second plane opposed in parallel or almost parallel with the first plane.
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This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2008-190045, filed on Jul. 23, 2008, the entire contents of which are incorporated herein by reference.
FIELDThe embodiment discussed herein is related to a water pillow for heat radiation for cooling heat generated by a target.
BACKGROUNDRecently, thanks to the improvement of a semiconductor integration technology, the high-density of integrated circuits and the like has been made possible and the improvement of the functions of an integrated circuit used in an operation device and the like has been promoted. However, the amount of generated heat of integrated circuits and the like increased compared with conventional one. A cooling device for cooling this generated heat is widely used.
Related to the above technology, for example, the cooling device of heat radiating electronic components for receiving heat by a contact type liquid-cooling/heat-receiving pump which can be small-sized, thin and simple-structured while cooling efficiency is improved is known.
Also, a liquid cooling system for improving cooling performance by increasing heat conductivity by striking cooling liquid against a heat sink, generating collision jet flow and speeding up liquid current is known.
Patent document 1: Japanese Patent Laid-open Application No. 2004-285888
Patent document 2: Japanese Patent Laid-open Application No. 2005-317797
Patent document 3: Japanese Patent Laid-open Application No. 2006-039663
SUMMARYHowever, demand for a higher-cooling efficiency cooling device is increasing. In order to improve cooling efficiency, a water-cooling type device is effective. Thus, higher-cooling efficiency water pillow for heat radiation is desired.
In order to solve the above-described problem, the water pillow of this invention is a water pillow for heat radiation for radiating heat by touching a heat generating object, absorbing heat from the heat generating object and radiating heat by cooling liquid circulating inside the water pillow and the water pillow includes an inflow inlet for flowing the cooling liquid inside the water pillow, a drain outlet for flowing the cooling liquid out of inside the water pillow, a plurality of cooling fins spokewise disposed on a first plane constituting a cavity inside the water pillow where the cooling liquid circulates and an impeller for circulating the cooling liquid in a whirl disposed on a second plane opposed in parallel or almost parallel with the first plane.
The object and advantages of the embodiment will be realized and attained by means of the elements and combinations particularly pointed out in the claims.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the embodiment, as claimed.
One example of the preferred embodiments of the present invention will be explained with reference to
The cooling device 100 illustrated in
The water pillow 101 is a rectangular parallelepiped made of a material having a high heat conductivity, such as copper or the like. It has rectangular parallelepiped cavity inside and can feed and discharge cooling water from the feeding inlet a and the drain outlet b, respectively.
The impeller 102 is provided at the center of the top surface c of the cavity inside the water pillow 101, and when the impeller 102 is rotated by the motor 103, the cooling water inside the cavity can be circulated in a whirl.
Furthermore, the cooling fins 105 that are spokewise disposed around the neighborhood of the impeller 102 is provided on the bottom surface d of the cavity inside the water pillow 101, and heat conducted from a heat generating object 106 via a contact part e is radiated into the cooling water via the cooling fins 105.
The cooling water circulator 104 includes, for example, a pump for circulating cooling water in the direction of the feed inlet a, a reserve tank for storing a certain capacity of cooling water and a radiator for cooling cooling water discharged from the drain outlet b.
Although in this preferred embodiment having the above configuration, the case in which cooling water is used is explained, the invention is not limited to this type of cooling water and various types of cooling liquid can be also used, as requested. Although, in this preferred embodiment, the shapes of the water pillow 101 and the cavity inside the water pillow are rectangular parallelepiped, the invention is not limited to this shape and the shape can be appropriately determined according to the shape of the heat generating object 106, the disposition environment of the cooling device 100 and the like.
As illustrated in
Then, the cooling water strikes against the cooling fins 105 at perpendicular or near-perpendicular incident angle. In another words, the cooling water collide with the cooling fins 105 at the maximum speed. As a result, heat can be efficiently conducted by convection.
Furthermore, the cooling water that has collided with the cooling fins 105 flows in the direction of an arrow y along the cooling fins 105 and when reaching the outer circumference of the spokes, it circulates in a y′ direction and also circulates in a whirl according to the rotation of the impeller 102. Therefore, the cooling water can smoothly circulate in a whirl. As a result, since cooling liquid can be applied to the cooling fins 105 at higher speed, a high heat radiation effect on the cooling water can be obtained.
Naturally, the number of the cooling fins 105 is not limited in
Although linear cooling fins 105 are spokewise disposed on the button surface d in
Thus, since the cooling water that has collided with the cooling fins 105 more smoothly flows along the cooling fins 105 in the direction of an arrow z, the cooling water can more smoothly circulate in a whirl. As a result, since the cooling water can be struck against the cooling fins 105 at higher speed, the high radiation effect of the cooling water can be obtained.
As illustrated in
Thus, the cooling water that is circulated in a whirl by the rotation of the impeller 102 provided on the top surface c is applied to the cooling fins 105 at a perpendicular or nearly perpendicular incident angle. In another words, the cooling water collides with the cooling fins 105 at the maximum speed. As a result, since the heat conductivity by convection is improved, the water pillow 101 can obtain a higher radiation effect.
The above-described elevation angle α can be appropriately determined taking into consideration the size of the cavity of the water pillow 101, the height of the cooling fins 105 and the like. Although the cooling fins 105 are fixed on its bottom surface d in such a way as illustrated in
Although belt-like or plane plate-shaped cooling fins 105 are used in the above explanation, one having the following shapes can be also used.
When viewed from the side as illustrated in
The cross-section obtained by cutting the D-D′ and E-E′ of the cooling fins 501 along a plane orthogonal to the bottom surface d forms a circular arc-shaped or almost circular arc-shaped gently curved line and a side forming an elevation angle with the bottom surface d becomes concave. Thus, the water current of the cooling water coming toward the cooling fins 501 can be surely caught and the cooling water can circulate into the root portion of the cooling fins 501. Therefore, the heat conductivity from the cooling fins 501 to the cooling water can be improved. As a result, the cooling efficiency can be improved.
Like
When viewed from the side as illustrated in
Like in
Each of the cooling fins 105 illustrated in
In the above explanation, all the heights (for example, h illustrated in
The cooling fins 701 illustrated in
Thus, variation in the water pressure and the amount of water when the cooling water is applied to each cooling fin 105 can be suppressed.
Also, even when the cooling fins 701 are somewhat crowded, the heat conductivity from the cooling fins 701 to the cooling water can be improved since the cooling water circulating in a whirl is directly applied to each cooling fin 701. As a result, the cooling efficiency can be improved.
Although three types of cooling fins 701 each having different height are used in
As illustrated in
As illustrated in
Furthermore, as illustrated in
According to this preferred embodiment, since cooling fins are spokewise disposed on a first plane constituting a cavity inside for circulating cooling water and an impeller disposed on a second plane opposed in parallel or almost parallel with the first plane circulates the cooling water filled in the cavity in a whirl, the cooling water circulating in a whirl is applied to the cooling fins at an incident angle perpendicular or nearly perpendicular to the cooling fins. Therefore, the cooling water can be applied to the cooling fins at higher speed. Therefore, heat conductivity by convection can be improved and cooling efficiency can be improved.
As explained above, by the disclosed water pillow for heat radiation, the cooling efficiency of a device to which the water pillow is applied can be improved.
All examples and conditional language recited herein are intended for pedagogical purposes to aid the reader in understanding the invention and the concepts contributed by the inventor to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions, nor does the organization of such examples in the specification relate to a depicting of the superiority and inferiority of the invention. Although the embodiments of the present inventions have been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.
Claims
1. A water pillow for heat radiation for touching a heat generating object, absorbing heat from the heat generating object and radiating heat by cooling liquid that circulates inside the water pillow, comprising:
- an inflow inlet for flowing the cooling liquid inside the water pillow;
- a drain outlet for flowing the cooling liquid out of inside the water pillow;
- a plurality of cooling fins spokewise disposed on a first plane constituting a cavity inside the water pillow where the cooling liquid circulates; and
- an impeller for circulating in a whirl the cooling liquid disposed on a second plane opposed in parallel or almost parallel with the first plane.
2. The water pillow for heat radiation according to claim 1, wherein
- each of said cooling fins spokewise disposed on the first plane forms a circular arc or almost circular arc forming a curved line in a circulating direction of the cooling liquid that circulates in a whirl inside the water pillow.
3. The water pillow for heat radiation according to claim 1, wherein
- each of said cooling fins spokewise disposed on the first plane forms an elevation angle which is formed between the first plane and the cooling fin and which is formed on a side where the cooling liquid that circulates in a whirl inside the water pillow is directly applied.
4. The water pillow for heat radiation according to claim 1, wherein
- each of said cooling fins spokewise disposed on the first plane has a cross-section cut along a plane orthogonal to the cooling fin and the first plane which shows a form of concave circular arc or almost circular arc on a side where the cooling liquid that circulates in a whirl inside the water pillow is directly applied.
5. The water pillow for heat radiation according to claim 4, wherein
- said cooling fin forms a larger circular arc or almost circular arc or plane in a farther outer circumference side of the radiation.
6. The water pillow for heat radiation according to claim 4, wherein
- height of said cooling fin from the first plane increases in a farther outer circumference side of the radiation.
7. The water pillow for heat radiation according to claim 1, wherein
- said cooling fins are a group of sets of a plurality of cooling fins having different height.
8. The water pillow for heat radiation according to claim 7, wherein
- said cooling fins are disposed in such a way that the height of the cooling fins gradually increases along a circulating direction of the cooling liquid that circulates in a whirl inside the water pillow.
9. A cooling device provided with a water pillow for heat radiation for touching a heat generating object, absorbing heat from the heat generating object and radiating heat by cooling liquid that circulates inside the water pillow, said device comprising:
- a water pillow comprising: an inflow inlet for flowing the cooling liquid inside the water pillow; a drain outlet for flowing the cooling liquid out of inside the water pillow; and a cavity which is inside the water pillow that circulates the cooling liquid and which includes a plurality of cooling fins spokewise disposed on a first plane constituting the cavity and an impeller disposed on a second plane opposed in parallel or almost parallel with the first plane for circulating the cooling liquid in a whirl, and
- a pump for flowing the cooling liquid in the flow inlet, flowing the cooling liquid out of the drain outlet and circulating the cooling liquid in the cavity.
Type: Application
Filed: Jun 5, 2009
Publication Date: Jan 28, 2010
Applicant: FUJITSU LIMITED (Kawasaki)
Inventor: Michitaka Tani (Kawasaki)
Application Number: 12/478,818
International Classification: F28D 15/00 (20060101); F28F 13/12 (20060101); F28F 1/10 (20060101);