1. Technical Field
The disclosure relates to heat pipes, and particularly to a heat pipe comprising a sealed vesicle therein.
2. Description of the Related Art
Heat pipes have excellent heat transfer performance due to their low thermal resistance, and are therefore an effective means for transfer or dissipation of heat from heat sources. Currently, heat pipes are widely used for removing heat from heat-generating components such as central processing units (CPUs) of computers, especially in a notebook computer having a smaller inner space therein. Preferably, a wick structure is attached to an inner surface of the heat pipe for drawing the working medium back to the evaporator section after it is condensed at the condenser section. An inner surface of the wick structure defines a vapor channel through which vapor moves from the evaporator section toward the condenser section. With the notebook computer becoming smaller and smaller, a size of the vapor channel is greatly reduced. Thus, the vapor can not flow fluently from the evaporator section toward the condenser section via the vapor channel, thereby decreasing the heat transfer capability of the heat pipe.
Therefore, it is desirable to provide a heat pipe with an improved heat transfer capability to overcome the above mentioned shortcoming.
The components of the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the embodiments of the display device. Moreover, in the drawings, like reference numerals designate corresponding parts throughout several views.
Referring to
In this embodiment, the heat pipe 100 is a straight heat pipe with a round transverse-section. Alternatively, the heat pipe 100 can be a flat heat pipe. The casing 10 is made of metal having a good thermal conductivity, such as copper. The casing 10 defines a sealed receiving space 18 therein. The casing 10 is evacuated and hermetically sealed. The casing 10 includes an evaporating section 11, a condensing section 15, and a connecting section 13 connecting the evaporating section 11 and the condensing section 15.
The sealed vesicle 20 is made of soft metal to have good ductility and malleability. In this embodiment, the sealed vesicle 20 is made of copper foil or aluminum foil. The sealed vesicle 20 extends from the evaporating section 11 to the condensing section 15. The sealed vesicle 20 includes a heat absorbing portion 21 in the evaporating section 11, a heat dissipating portion 25 in the condensing section 15, and uneven portion 23 in the connecting section 13. The heat absorbing portion 21 and the heat dissipating portion 25 are mounted on and flatly contact the inner surface of the casing 10. In this embodiment, the heat absorbing portion 21 tightly contacts a bottom of the inner surface of the evaporating section 11, and the heat dissipating portion 25 tightly contacts a top of the inner surface of the condensing section 15. Since the sealed vesicle 20 shrinks in a normal state, the uneven portion 23 of the sealed vesicle 20 are spaced from the inner surface of the casing 10.
The sealed vesicle 20 defines a sealed cavity 28 therein. The sealed vesicle 20 is evacuated and hermetically sealed after the working medium 30 is injected into the sealed vesicle 20. The working medium 30 is usually selected from a liquid such as water, methanol, or alcohol, which has a low boiling point. Thus, the working medium 30 can easily evaporate to vapor when it receives heat at the heat absorbing portion 21 of the sealed vesicle 20 and the evaporating section 11.
Referring to
Referring to
It is to be further understood that even though numerous characteristics and advantages have been set forth in the foregoing description of the embodiment(s), together with details of the structures and functions of the embodiment(s), the disclosure is illustrative only; and that changes may be made in detail, especially in the matters of shape, size, and arrangement of parts within the principles of the disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
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Number | Date | Country |
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101968327 | Feb 2011 | CN |
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Number | Date | Country | |
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20130081787 A1 | Apr 2013 | US |