HEAT PIPE AND METHOD FOR MANUFACTURING THE SAME
A heat pipe includes a metallic pipe, a wick structure and a working fluid. The interior of the metallic pipe has a sealing chamber, and is formed into an evaporating section, an adiabatic section and a condensing section along its lengthwise direction. The wick structure comprises a first wick structure and two elongate second wick structures connected to the first wick structure. The first wick structure is adhered to the inner wall of the evaporating section. The two second wick structures are separated from each other and adhered to the inner walls of the evaporating section, the adiabatic section and the condensing section. A gas channel is formed between the two second wick structures, and has a smooth surface. The working fluid is filled in the sealed chamber. By this arrangement, the space for the gas channel can be enlarged, thereby accelerating the flowing speed of the internal gas and enhancing the heat-conducting efficiency of the heat pipe.
1. Field of the Invention
The present invention relates to a heat pipe, and in particular to a heat pie that can be used to dissipate the heat of a heat-generating source of an electronic device and a method for manufacturing the same.
2. Description of Prior Art
With the continuous advancement of the operating speed of the central processing unit (CPU) of a computer, the amount of heat generated by the operation of the computer is increasing to a large extent. The heat-dissipating device comprised of an aluminum-extruded heat sink and a fan has become unable to satisfy the requirements for the heat dissipation of the current central processing unit. Thus, the manufacturers in this field propose novel heat pipes having better heat-dissipating efficiency. Then, this kind of novel heat pipe is combined with a heat sink to solve the problem of heat dissipation at the current stage. However, the design of the internal structure of the heat pipe is dependent on the flowing speed of the gas and fluid within the heat pipe and the usage of space. Therefore, the present Inventor aims to propose a novel heat pipe and a method for manufacturing the same in view of the above problems.
The conventional heat pipe includes a metallic pipe, a wick structure and a working fluid. The metallic pipe has a sealed chamber. The wick structure is circumferentially adhered to the inner walls of the metallic pipe. The working fluid is filled in the sealed chamber of the metallic pipe. The inside of the wick structure is formed with a gas channel, thereby forming a heat pipe.
Although the conventional heat pipe can transfer the heat generated by a heat-generating source by means of the phase change between the vapor and liquid states of the working fluid, the wick structure provided on the inner wall of the metallic pipe may substantially narrow the gas channel within the metallic pipe. Furthermore, the internal surface of the wick structure is of a rugged surface, which may further obstruct the flowing speed of the internal gas. The above-mentioned problems are the primary factors causing the poor efficiency in dissipating the heat of the heat pipe. Therefore, it is an important issue to improve the conventional heat pipe.
SUMMARY OF THE INVENTIONThe present invention is to provide a heat pipe and a method for manufacturing the same. The interior of the metallic pipe is formed with a gas channel having a smooth surface, thereby enlarging the space of the gas channel and increasing the flowing speed of the internal gas. Thus, the heat-conducting efficiency can be improved greatly.
The present invention is to provide a heat pipe, which includes a metallic pipe, a wick structure and a working fluid. The interior of the metallic pipe has a sealing chamber. The metallic pipe is formed into an evaporating section, an adiabatic section and a condensing section along its lengthwise direction. The wick structure comprises a first wick structure and two elongate second wick structures connected to the first wick structure. The first wick structure is adhered to the inner wall of the evaporating section. The two second wick structures are separated from each other and adhered to the inner walls of the evaporating section, the adiabatic section and the condensing section. A gas channel is formed between the two second wick structures. The gas channel has a smooth surface. The working fluid is filled in the sealed chamber.
The present invention provides a method for manufacturing a heat pipe, including the steps of:
a) providing a metallic pipe with a sealed end;
b) inserting a core rod into the metallic pipe, a portion of the circumference of the core rod being adhered to the inner wall of the metallic pipe, a pitch being formed between the other portion of the circumference of the core rod and the inner wall of the metallic pipe;
c) filling metallic powder into the metallic pipe through the pitch;
d) sintering the metallic powder;
e) removing the core rod, forming inside the metallic pipe with a first wick structure and two elongate second wick structures connected to the first wick structure, a gas channel being formed between the two second wick structures, the gas channel having a smooth surface; and
f) filling a working fluid in the metallic pipe, degassing and sealing the metallic pipe.
The present invention has advantageous effects as follows. With different particle sizes and pore arrangement of the first and second wick structures, the condensed liquid within the heat pipe can flow back to the evaporating section rapidly, thereby overcoming the dry-out of the heat pipe efficiently. Further, with a flat profile of the heat pipe, it can be widely used in the electronic devices that are made more and more compact. Therefore, such a heat pipe can be used in various fields.
The characteristics and technical contents of the present invention will be explained in more detail with reference to the accompanying drawings. However, the drawings are illustrative only but not used to limit the present invention.
Please refer to
The metallic pipe 10 is pre-formed to have a flat profile. The cross section of the metallic pipe 10 is enclosed by two flat plates 101 and two curved plates 102 (
The wick structure 20 comprises a first wick structure 21 and two elongate second wick structures 22 connected to the first wick structure 21. The first wick structure 21 is adhered to the inner wall of the evaporating section 12. The two elongate second wick structures 22, 23 are separated from each other and adhered to the inner walls of the evaporating section 12, the adiabatic section 13 and the condensed section 14. A gas channel 24 (
More specifically, the wick structure 20 is made by means of sintering metallic powder. The first wick structure 21 is formed in the trough 104 of the lower flat plate 101 (
The working fluid may be selected from pure water or other suitable fluids. The working fluid 30 is filled in the sealed chamber 11 of the metallic pipe 10.
Please refer to
In a step S100, a metallic pipe 10 having a sealed end 105 (
In a Step S110, a core rod 5 is inserted into the metallic pipe 10. A portion of the circumference of the core rod 5 is adhered to the inner wall of the metallic pipe 10. A pitch A is formed between the other portion of the circumference of the core rod 5 and the inner wall of the metallic pipe 10, as shown in
In a step S120, metallic powder 6 is filled in the metallic pipe 10 through the pitch A (
In a step S140, the core rod 5 is removed. The interior of the metallic pipe 10 is formed with a first wick structure 21 and two elongate second wick structures 22, 23 connected to the first wick structure 21. A gas channel 24 is formed between the two second wick structures 22, 23. The gas channel 24 has a smooth surface 241 (
In a step S150, a working fluid 30 is filled in the metallic pipe 10. Then, the metallic pipe 10 is subjected to a degassing and sealing process (
In addition, the method of the present invention further comprises a step S160 that can be performed after the step S140 or Step 150. In this step S160, a forming device is used to leveling the protrusion 103 (
Please refer to
In a step S310, a core rod 5′ is inserted into the metallic pipe 10. A portion of the circumference of the core rod 5′ is adhered to the inner wall of the metallic pipe 10. A pitch A is formed between the other portion of the circumference of the core rod 5′ and the inner wall of the metallic pipe 10 (
In a step S320, metallic powder 6 is filled in the metallic pipe 10 through the pitch A (
Please refer to
According to the above, the heat pipe of the present invention and the method for manufacturing the same really achieve the desired objects and solve the drawbacks of prior art. Further, the present invention demonstrates novelty and inventive steps, and conforms to the requirements for an invention patent.
Claims
1. A heat pipe, comprising:
- a metallic pipe with an interior thereof having a sealed chamber, the metallic pipe being formed into an evaporating section, an adiabatic section and a condensing section along a lengthwise direction thereof;
- a wick structure comprising a first wick structure and two elongate second wick structures connected to the first wick structure, the first wick structure being adhered to an inner wall of the evaporating section, the two second wick structures being separated from each other and adhered to an inner walls of the evaporating section, the adiabatic section and the condensing section, a gas channel being formed between the two second wick structures, the gas channel having a smooth surface; and
- a working fluid filled in the sealed chamber.
2. The heat pipe according to claim 1, wherein the heat pipe is a flat heat pipe.
3. The heat pipe according to claim 2, wherein the heat pipe is enclosed by the two flat plates and two curved plates.
4. The heat pipe according to claim 3, wherein the first wick structure is formed on the flat plate.
5. The heat pipe according to claim 3, wherein the second wick structure is formed on the curved plate.
6. The heat pipe according to claim 2, wherein an outer surface of the evaporating section protrudes to form a protrusion, an interior of the protrusion is formed with a trough, and the first wick structure is filled in the trough.
7. The heat pipe according to claim 6, wherein the wick structure is made by sintering metallic powder.
8. A method for manufacturing a heat pipe, comprising the steps of:
- a) providing a metallic pipe with a sealed end;
- b) inserting a core rod into the metallic pipe, a portion of the circumference of the core rod being adhered to an inner wall of the metallic pipe, a pitch being formed between the other portion of a circumference of the core rod and the inner wall of the metallic pipe;
- c) filling metallic powder into the metallic pipe through the pitch;
- d) sintering the metallic powder;
- e) removing the core rod, forming inside the metallic pipe with a first wick structure and two elongate second wick structures connected to the first wick structure, a gas channel being formed between the two second wick structures, the gas channel having a smooth surface; and
- f) filling a working fluid in the metallic pipe, degassing and sealing the metallic pipe.
9. The method according to claim 8, wherein a circular metallic pipe is pressed by a forming die to form a flat profile in the step a), and the flattened metallic pipe is enclosed by two flat plates and two curved plates.
10. The method according to claim 9, wherein an outer surface of the flat plate is formed with a protrusion, and an inside of the protrusion is formed with a trough.
11. The method according to claim 10, wherein a rectangular core rod is inserted into the metallic pipe in the step b), upper and lower surfaces of the core rod are clamped by the inner walls of the two flat plates so as to be adhered to each other, a pitch is formed between the left and right surfaces of the core rod and the inner walls of the two curved plates, and the pitch is in communication with the trough.
12. The method according to claim 11, further comprising a step g) of leveling the protrusion by means of a forming device.
13. The method according to claim 9, wherein a rectangular core rod having a concave surface is inserted into the metallic pipe in the step b), upper and lower surfaces of the core rod are clamped by the inner walls of the two flat plates so as to be adhered to each other, the pitch is formed between the left and right surfaces of the core rod and the inner walls of the two curved plates, the metallic pipe is formed with an accommodating trough corresponding to the concave surface, the accommodating trough is in communication with the pitch.
14. The method according to claim 8, wherein metallic powder of small particles is filled in a bottom section of the metallic pipe in the step c), and then metallic powder of larger particles is filled in the middle and upper sections of the metallic pipe.
Type: Application
Filed: Jul 28, 2009
Publication Date: Feb 3, 2011
Inventors: Yu-Po HUANG (Kunshan City), Tung-Jung Kuo (Kunshan City)
Application Number: 12/510,461
International Classification: F28D 15/04 (20060101); B21D 53/02 (20060101);