METHOD FOR MANUFACTURING HEAT PIPE WITH ARTERY PIPE
An exemplary method for manufacturing a heat pipe includes the following steps: providing a tube, a mandrel and an artery pipe, the tube defining an opening at one end thereof, a wick structure being positioned on an inner surface of the tube, a slot being defined in an outer surface of the mandrel; inserting the mandrel and the artery pipe into the tube via the opening, the artery pipe being received in the slot; baking the tube with the mandrel and the artery pipe to make the artery pipe join the wick structure; drawing the mandrel out of the tube via the opening; and injecting a working media into the tube, and evacuating and sealing the tube.
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1. Technical Field
The disclosure generally relates to a method for manufacturing a heat pipe, and particularly to a method for manufacturing a heat pipe with an artery pipe.
2. Description of Related Art
Heat pipes are widely used in various fields for heat dissipation purposes due to their excellent heat transfer performance. Currently, a typical heat pipe includes a sealed tube made of thermally conductive material and a working fluid contained in the tube. The working fluid is employed to carry heat from one end of the tube, typically called an “evaporator section,” to the other end of the tube, typically called a “condenser section.” Preferably, a wick structure is provided inside the heat pipe, lining an inner wall of the tube, for drawing the working fluid back to the evaporator section after it is condensed at the condenser section.
During operation, the evaporator section of the heat pipe is maintained in thermal contact with a heat-generating component. The working fluid contained at the evaporator section absorbs heat generated by the heat-generating component and then turns into vapor. Due to the difference of vapor pressure between the two sections of the heat pipe, the generated vapor moves and thus carries the heat towards the condenser section where the vapor is condensed into condensate after releasing the heat into ambient environment via, for example, fins thermally contacting the condenser section. Due to the difference in capillary pressure which develops in the wick structure between the two sections, the condensate is then drawn back by the wick structure to the evaporator section where it is again available for evaporation.
Usually, an artery pipe is provided inside the heat pipe. The artery pipe enhances the capillary force to draw the condensate back and thereby avoid dry-out of the heat pipe. The artery pipe is sealed within the tube of the heat pipe, but is unfixed and can move freely in the tube. This can adversely affect vapor flow in the heat pipe. In addition, when such a heat pipe needs to be flattened to increase a contact surface with the heat-generating component, it is impracticable to ensure that the artery pipe is attached on a portion of the tube of the heat pipe aligning with the heat-generating component. Thus the performance of the heat pipe may be adversely affected.
What is needed, therefore, is a method for manufacturing a heat pipe which can overcome the described limitations.
Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
Referring also to
Referring also to
Referring also to
The tube 10 with the mandrel 20 and the artery pipe 30 is then heated in a high temperature furnace (not shown) to make the artery pipe 30 join with the wick structure 12. During heating, the mandrel 20 is kept in the tube 10 to ensure that the artery pipe 30 is straight and extends along a longitudinal direction of the tube 10, and further ensure that the artery pipe 30 intimately contacts the wick structure 12.
Referring to
Subsequent processes such as injecting a working media into the tube 10, and evacuating and sealing the tube 10, can be performed using conventional methods. Thus, a straight circular heat pipe is attained. A portion of the tube 10, where the markings 40 are formed, is finally flattened to form a flat-type heat pipe 50 which has a rectangular cross-section, as shown in
In use, the top surface 51 of the heat pipe 50, with the markings 40, is attached to the heat-generating component. At this time, the artery pipe 30 aligns with the heat-generating component.
In the present method for manufacturing the heat pipe 50, the slot 21 is defined in the mandrel 20. Thus, the artery pipe 30 is accurately fixed on the wick structure 12 of the tube 10, in an orientation whereby a length of the artery pipe 30 is fixed along a corresponding length of the wick structure 12. The artery pipe 30 cannot move freely in the tube 10. This increases the flow of the working media in the tube 10, and improves the heat transfer performance of the heat pipe 50. In addition, the markings 40 are formed on the circumferential surface of the tube 10, and align with the artery pipe 30. Accordingly, it is easy to ascertain the position of the artery pipe 30 according to the markings 40. In use, the position of the heat pipe 50 can be adjusted to make sure that the artery pipe 30 aligns with the heat-generating component, by using the markings 40 as guides. This further ensures the best heat transfer performance of the heat pipe 50.
In alternative embodiments, the shape and size of the slot 21 of the mandrel 20 can be varied, thereby forming different kinds of artery pipes 30 in the heat pipe 50 to satisfy different heat dissipation requirements. Furthermore, the mandrel 20 can have more than one slot 21, so that more than one artery pipe 30 is fixed in the tube 10. The embodiment described below includes one example of such variations.
Referring to
It is to be understood, however, that even though numerous characteristics and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Claims
1. A method for manufacturing a heat pipe, comprising:
- providing a tube, a mandrel and at least one artery pipe, the tube defining an opening at one end thereof, a wick structure being positioned on an inner surface of the tube, at least one slot being defined in an outer surface of the mandrel;
- inserting the mandrel and the at least one artery pipe into the tube via the opening, the at least one artery pipe being received in the at least one slot;
- baking the tube with the mandrel and the at least one artery pipe to make the at least one artery pipe join the wick structure;
- drawing the mandrel out of the tube via the opening; and
- injecting a working media into the tube, and evacuating and sealing the tube.
2. The method for manufacturing a heat pipe of claim 1, further comprising forming at least one marking on an outer surface of the tube at a position corresponding to the at least one artery pipe.
3. The method for manufacturing a heat pipe of claim 2, wherein the at least one marking comprises two markings formed at two ends of the tube, respectively.
4. The method for manufacturing a heat pipe of claim 2, further comprising flattening the tube at a position where the at least one marking is formed.
5. The method for manufacturing a heat pipe of claim 1, wherein the at least one slot of the mandrel has an elliptic cross-section, the at least one artery pipe being hollow and cylindrical, and having an outer diameter slightly less than a width of the at least one slot of the mandrel, but greater than a depth of the at least one slot of the mandrel, the at least one artery pipe being pressed by the wick structure and the mandrel to deform slightly when the at least one artery pipe and the mandrel are in the tube.
6. The method for manufacturing a heat pipe of claim 1, wherein the at least one slot is longitudinally defined in an outer circumferential surface of the mandrel, and extends through a front end surface and a rear end surface of the mandrel.
7. The method for manufacturing a heat pipe of claim 1, wherein the at least one slot comprises a plurality of slots located at two ends of the mandrel, respectively.
8. The method for manufacturing a heat pipe of claim 1, wherein the at least one artery pipe is formed by a plurality of metal wires woven together.
9. The method for manufacturing a heat pipe of claim 1, wherein the mandrel has an outer diameter substantially equal to an inner diameter of the tube with the wick structure, and a length greater than that of the tube.
Type: Application
Filed: Dec 7, 2009
Publication Date: Mar 3, 2011
Applicant: FOXCONN TECHNOLOGY CO., LTD. (Tu-Cheng)
Inventors: CHENG-JEN LIANG (Tu-Cheng), JUI-WEN HUNG (Tu-Cheng)
Application Number: 12/632,772
International Classification: B21D 53/02 (20060101);