Patent Application
20230122387
The disclosure relates to a vapor chamber, particularly to a vapor chamber with unequal cross-sectional widths.
With the uninterrupted increase of operational speed of electronic components, the heat generated therefrom becomes higher and higher. To effectively solve the problem of high heat, the industry has widely used vapor chambers with great thermo-conductivity. Because they possess a wide heated area to be directly attached on a heat source for heat conduction, the arrangement of the peripheral devices can be simplified. Thus, vapor chambers are the mainstream of future development.
The related-art vapor chamber has a wide heated area, but the flow of the evaporated working fluid is so chaotic. That limits its performance of heat dissipation. Usually, the related-art vapor chambers are of a simple geometric shape such as a square or a rectangle, so the fields and ranges of applications are considerably restricted. Also, in specific circumstances, there are using demands of different cross-sectional areas for vapor chambers. Such a vapor chamber with unequal cross-sectional areas has drawbacks of mutual interference and block of flows of vaporized working fluid and liquid working fluid, so it is not developed yet.
In view of this, the inventors have devoted themselves to the above-mentioned prior art, researched intensively and cooperated with the application of science to try to solve the above-mentioned problems.
An object of the disclosure is to provide a vapor chamber with unequal cross-sectional areas, which makes the evaporated working fluid slowly pass the passage and the liquid working fluid passing the passage be free from interfering by the evaporated working fluid to smoothly flow back to the evaporation portion.
To accomplish the above object, the disclosure provides a vapor chamber with unequal cross-sectional areas, which includes a case, an evaporation portion, a condensation portion, a transmission portion, and a working fluid. The case has a chamber. The evaporation portion is formed in one part of the case and has a first chamber room in the chamber. The condensation portion is formed in another part of the case and located on one side of the evaporation portion. The condensation portion has a second chamber room in the chamber. A cross-sectional width of the second chamber room is less than a cross-sectional width of the first chamber room. The transmission portion is formed in the case and between the evaporation portion and the condensation portion. The transmission portion has a passage communicating with the first chamber room and the second chamber room in the chamber. The passage has a first end adjacent to the evaporation portion and a second end adjacent to the condensation portion. A width of the first end is greater than a width of the second end. The working fluid is disposed in the chamber.
The disclosure further has the following functions. The shape arrangements of the partitions and the passage may reduce the passing speed of evaporated working fluid. The unequal widths of the passage may reduce the interference and block to the returning liquid working fluid when the evaporated working fluid passes the passage, and further avoid dry-out of the vapor chamber. The integration arrangement of the wick structure may make the liquid working fluid be free from interruption or discontinuity during reflowing, and the reflowing amount may be increased.
The technical contents of this disclosure will become apparent with the detailed description of embodiments accompanied with the illustration of related drawings as follows. It is intended that the embodiments and drawings disclosed herein are to be considered illustrative rather than restrictive.
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The case 10 of the embodiment includes a lower shell 11 and an upper shell 12. The upper shell 12 and the lower shell 11 are made of a material with desired conductivity, such as copper, aluminum, magnesium, or an alloy thereof. Please further refer to
The evaporation portion 20 of the embodiment is substantially of a quadrilateral shape and formed in one part of the case 10. The evaporation portion 20 has a first chamber room A1 in the chamber A.
The condensation portion 30 of the embodiment is substantially of a quadrilateral shape and formed in another part of the case 10. The condensation portion 30 has a second chamber room A2 in the chamber A. A cross-sectional width W2 of the second chamber room A2 is less than a cross-sectional width W1 of the first chamber room A1. A baseline BL is defined through the evaporation portion 20 and the condensation portion 30. The baseline BL is a connecting line of centers of the first chamber room A1 and the second chamber room A2. The cross-sectional widths W1, W2 are separately perpendicular to the baseline BL.
The transmission portion 40 of the embodiment is of a trapezoidal shape and formed in the case 10 and between the evaporation portion 20 and the condensation portion 30. The transmission portion 40 has a passage A3 in the chamber A. The passage A3 communicates with the first chamber room A1 and the second chamber room A2. The baseline BL also passes the center of the passage A3. The baseline BL may be a straight line or a type with partial curves as shown in
The working fluid 50 is disposed in the chamber A. The working fluid 50 is a liquid which may generate gas-liquid phase transition, such as pure water, etc.
Furthermore, the vapor chamber 1 of the disclosure includes a wick structure 60 laid on an inner surface of the bottom plate 111 of the lower shell 11. The wick structure 60 may be woven mesh, sintered metal powder or fiber bundles for transmitting the liquid working fluid 50 by capillary adsorption.
Furthermore, the vapor chamber 1 of the disclosure includes multiple partitions 70. Each partition 70 is radially arranged in the passage A3. An interval width of any adjacent two of the partitions 70 at the first end A31 is greater than an interval width of any adjacent two of the partitions 70 at the second end A32 so as to make the evaporated working fluid 50 be smoothly guided to enter the first end A31.
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Further, by the arrangement of the passage A3 and the partitions 70 (according to the relation of Q=AV, wherein Q: flow rate, A: cross-sectional area and V: flow speed), the flow speed is inversely proportional to the cross-sectional area, and a width of the first end A31 is greater than a width of the second end A32. In comparison with a passage with a straight cylindrical shape, the evaporated working fluid 50 may pass the passage A3 with a slower speed so as to reduce the interference and block to the returning liquid working fluid 50. That may avoid dry-out of the vapor chamber 1.
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While this disclosure has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of this disclosure set forth in the claims.
