Heat dissipation system with a spray cooling device
A heat dissipation system includes a cooling device, a condenser, a vapor conveying duct and a cooling liquid conveying duct. The cooling device includes a housing, and an orifice plate dividing an inner space of the housing into a liquid supply chamber and an evaporation chamber proximate to the heat source, and formed with multiple micro orifices each having a diameter ranging from 5 to 1000 micrometers. The condenser includes a fluid inlet, a condensing chamber and a fluid outlet. The vapor conveying duct connects a vapor outlet of the housing and the fluid inlet of the condenser. The cooling liquid conveying duct connects a cooling liquid inlet of the housing and a fluid outlet of the condenser.
This application claims priority of Taiwanese application no. 99104710 filed on Feb. 12, 2010.
BACKGROUND OF THE INVENTION1. Field of the Invention
The invention relates to a heat dissipation system, and more particularly to a closed-loop heat dissipation system that employs a principle of a liquid-vapor phase change.
2. Description of the Related Art
An ordinary active-type heat-dissipating system for electronic components such as a fan incorporated with fins, a fan incorporated with fins and heat-transmitting ducts, etc., usually faces a problem of insufficient unit area heat flux and hence cannot meet the requirement for dissipating heat generated by high-powered electronic components.
To meet the requirement for dissipating heat generated by high-powered electronic components, in recent years, heat dissipation technique employing operating principles of liquid-vapor phase change have been developed. For example, a self-contained spray heat dissipation system is disclosed in U.S. Pat. No. 7,082,778. This system operates based on a principle of an ink-jet technology using an ink injecting nozzle incorporating a heated electrode plate. A working fluid is drawn into a spray chamber through surface tension forces and is sprayed in the spray chamber. The sprayed liquid is vaporized when contacting the heated electronic components. During vaporization, part of the heat from the electronic components is absorbed by the vaporized liquid. However, the ink-jet nozzle not only has a complicated structure, but also requires an electrode plate that must be heated, resulting in an increased temperature of the working fluid and reducing an overall heat dissipation effect.
SUMMARY OF THE INVENTIONAn object of the present invention is to provide a heat dissipation system with a simple construction and high heat dissipating efficiency.
Another object of this invention is to provide a cooling device that can efficiently spray a working fluid to assist vaporization.
Accordingly, a heat dissipation system for dissipating heat from a heat source according to the present invention, includes a cooling device, a condenser, a vapor conveying duct and a cooling liquid conveying duct. The cooling device includes a housing, and an orifice plate mounted in the housing. The orifice plate divides an inner space of the housing into a liquid supply chamber and an evaporation chamber proximate to the heat source, and has a plurality of micro orifices each having a diameter ranging from 5 to 1000 micrometers. The housing has a cooling liquid inlet communicated with the liquid supply chamber and adapted to permit a working fluid to flow into the liquid supply chamber, and a vapor outlet communicated with the evaporation chamber.
The condenser includes a fluid inlet, a condensing chamber and a fluid outlet. The vapor conveying duct is connected to the vapor outlet of the housing and the fluid inlet of the condenser. The cooling liquid conveying duct is connected to the cooling liquid inlet of the housing and the fluid outlet of the condenser. The cooling device, the condenser, the vapor conveying duct and the cooling liquid conveying duct cooperate to form a closed circuit.
Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments with reference to the accompanying drawings, of which:
Before the present invention is described in greater detail with reference to the accompanying preferred embodiments, it should be noted herein that like elements are denoted by the same reference numerals throughout the disclosure.
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In the beginning, a surface of a substrate body 80, such as a glass substrate, is formed with a metal layer deposited (not shown in the Figure) by a technique, such as physical vapor deposition (abbreviated as PVD), or chemical vapor deposition (abbreviated as CVD). Next, a photoresist layer is formed by spin coating, or dip coating. The photoresist layer is exposed through a photomask by a photolithography technique, and is developed to remove the unexposed area of the photoresist layer and to thereby expose parts of the deposited metal layer to be removed. Thereafter, the exposed part of deposited metal layer uncovered by the photoresist layer is etched, and the remaining photoresist layer is removed. At this state, the deposited metal layer 81 formed on the substrate body 80 is provided with a plurality of holes 810, as shown in
Referring to
The orifice plate 12 may also be made by other methods, such as electro-forming, laser processing, thermal pressure forming, injection molding, etc.
Referring back to
When the working fluid flows into the liquid supply chamber 102 through the cooling liquid inlet 101, the working fluid is sprayed into the evaporation chamber 103 through the multiple micro orifices 120. The working fluid sprayed into the evaporation chamber 103 forms a thin sprayed layer on a bottom of the evaporation chamber 103 where the heat source 70 is disposed. The sprayed layer absorbs heat generated by the heat source 70 and is vaporized. Bubbles 9 are easily formed on the heat source 70 due to vaporization of the working fluid. The vapor from the heat source 70 exits from the housing 1 through the vapor outlet 104.
In this embodiment, because the lower housing part 112 has an inner surface formed with microstructure, the surface area thereof is increased, improving the effects of evaporating the working fluid and absorbing heat from the heat source 70.
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Preferably, the chamber casing 21 has an inclined bottom side, the fluid outlet 203 is formed at a lower position of the bottom side, and the fluid inlet 201 is arranged to be higher than the fluid outlet 203. With such a design, the cooling liquid is permitted to easily flow into the cooling liquid conveying duct 4. The cooling liquid conveying duct 4 is connected to the cooling liquid inlet 101 of the cooling device 1 and the fluid outlet 203 of the condenser 2.
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When the working fluid enters the housing 1 through the cooling liquid inlet 101, the working fluid is guided by the liquid guiding plates 14 to flow in the guided directions. As shown in
The cooling system 100 of this invention can be mounted to an LED lamp device 71 as shown in
While the present invention has been described in connection with what is considered the most practical and preferred embodiments, it is understood that this invention is not limited to the disclosed embodiments but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.
Claims
1. A heat dissipation system for dissipating heat from a heat source, said heat dissipation system comprising:
- a cooling device including a housing, and an orifice plate that divides an inner space of said housing into a liquid supply chamber and an evaporation chamber proximate to the heat source, said housing having a cooling liquid inlet communicated with said liquid supply chamber and adapted to permit a working fluid to flow into said liquid supply chamber, and a vapor outlet communicated with said evaporation chamber, said orifice plate having a plurality of micro orifices, each of which has a diameter ranging from 5 to 1000 micrometers;
- a condenser including a fluid inlet, a condensing chamber and a fluid outlet;
- a vapor conveying duct connected to said vapor outlet of said housing and said fluid inlet of said condenser; and
- a cooling liquid conveying duct connected to said cooling liquid inlet of said housing and said fluid outlet of said condenser;
- wherein said cooling device, said condenser, said vapor conveying duct and said cooling liquid conveying duct cooperate to form a closed circuit.
2. The heat dissipation system as claimed in claim 1, wherein each of said micro orifices of said orifice plate has a liquid intaking end and a liquid ejecting end, each of said micro orifices tapering from said liquid intaking end to said liquid ejecting end.
3. The heat dissipation system as claimed in claim 2, wherein said orifice plate of said cooling device is formed by electro-forming, laser processing, thermal pressure forming, or injection molding.
4. The heat dissipation system as claimed in claim 1, wherein each of said micro orifices has a diameter ranging from 5 to 500 micrometers.
5. The heat dissipation system as claimed in claim 4, wherein, each of said micro orifices has a diameter ranging from 10 and 200 micrometers.
6. The heat dissipation system as claimed in claim 1, wherein said micro orifices are spaced from each other by a distance that ranges from 5 to 2000 micrometers.
7. The heat dissipation system as claimed in claim 1, wherein said orifice plate has a thickness ranging from 20 to 300 micrometers.
8. The heat dissipation system as claimed in claim 1, wherein said housing of said cooling device has an upper housing part defining said liquid supply chamber and a lower housing part defining said evaporation chamber and assembled to said upper housing part.
9. The heat dissipation system as claimed in claim 8, wherein said lower housing part has an inner surface formed with microstructure for enhancing vaporization effect.
10. The heat dissipation system as claimed in claim 8, wherein said cooling device further includes a plurality of flow guiding plates mounted on an inner surface of said upper housing part.
11. The heat dissipation system as claimed in claim 1, wherein said condenser includes a chamber casing, and a plurality of fins connected to said chamber casing.
12. The heat dissipation system as claimed in claim 11, wherein each of said fins is hollow and has an interior space communicated with an interior of said chamber casing, said chamber casing and said fins defining said condensing chamber.
13. The heat dissipation system as claimed in claim 12, wherein said chamber casing of said cooling device has an inclined bottom side, said fluid outlet being formed at a lower part of said bottom side, said fluid inlet being higher than said fluid outlet.
14. The heat dissipation system as claimed in claim 12, wherein said condenser further includes a fan adjacent to said fins.
15. The heat dissipation system as claimed in claim 12, wherein said chamber casing and said fins have inner surfaces formed with microstructures to enhance a condensation effect.
16. The heat dissipation system as claimed in claim 1, wherein said vapor conveying duct has an inner surface formed with microstructures that enhance a condensation effect.
17. The heat dissipation system as claimed in claim 1, further comprising a fluid driving module that includes a pump connected to said closed circuit for drawing the working fluid.
18. The heat dissipation system as claimed in claim 17, wherein said fluid driving module further includes a control valve inserted into said closed circuit for controlling the flow rate of the working fluid.
19. The heat dissipation system as claimed in claims 17, further comprising a power and control module for supplying power and controlling the operation of said closed circuit.
20. The heat dissipation system as claimed in claim 19, wherein said cooling device further includes a temperature sensing member for sensing a temperature of the heat source, said power and control module being connected to said temperature sensing member and controlling said fluid driving module based on the temperature sensed by said temperature sensing member.
21. The heat dissipation system as claimed in claims 19, wherein said condenser further includes temperature sensing member for sensing a temperature in said condensing chamber and a pressure sensing member for sensing a pressure in said condensing chamber, said power and control module being connected to said temperature sensing member and said pressure sensing member, and controlling said fluid driving module based on the temperature sensed by said temperature sensing member and the pressure sensed by said pressure sensing member.
22. A cooling device included in a heat dissipation system as claimed in claim 1, comprising: a housing, and an orifice plate dividing an inner space of said housing into a liquid supply chamber and an evaporation chamber proximate to a heat source, said housing having a cooling liquid inlet communicated with said liquid supply chamber and adapted to permit a working fluid to flow into said liquid supply chamber, and a vapor outlet communicated with said evaporation chamber, said orifice plate having a plurality of micro orifices, each of which has a diameter ranging from 5 to 1000 micrometers.
Type: Application
Filed: Feb 3, 2011
Publication Date: Nov 17, 2011
Applicant: MicroBase Technology Group (Guishan Township)
Inventors: Ching-Ping Wu (Guishan Township), Kai-An Cheng (Guishan Township), Chun-Hsien Wu (Guishan Township), Ju-Hong Lin (Guishan Township), Chia-Chen Liao (Guishan Township), Hsien Meng (Guishan Township), Hsien-Chun Meng (Guishan Township)
Application Number: 12/931,605
International Classification: F28D 5/00 (20060101); F25D 17/00 (20060101);