TWM493669U - Flat plate heat pipe with liquid-vapor separation - Google Patents

Abstract

A flat plate heat pipe with liquid-vapor separation has a flat plate outer casing with an enclosed vacuum chamber; a hollow pipe part having multiple layers parallel arranging of hollow pipes, and first opening parts and second opening parts located at two ends of the hollow pipes, the hollow pipes with a first space, the hollow pipes located in the chamber and connected with the flat plate outer casing; a second space formed between the hollow pipes and gaps between the hollow pipes and the flat plate casing; and a fluid being a gas phase fluid and a liquid phase fluid, the gas phase fluid located in the first space and the liquid phase fluid located in the second space; wherein when the liquid phase fluid heating and turning into the gas phase fluid, the gas phase fluid entering into the first space from the first opening; when the gas phase fluid cooling in the first space and turning into the liquid phase fluid, the liquid phase fluid entering into the second space from the second opening.

Description

Flat type heat pipe with liquid vapor separation

This creation is a flat type heat pipe, especially for a flat type heat pipe with liquid vapor separation.

In recent years, with the vigorous development of the 3C industry, the development trend of electronic products and components is toward light, thin, short, and high-performance output, and the shrinking appearance of 3C products (such as CPUs in computers) has also caused How to improve the heat dissipation per unit volume, how to effectively improve the heat dissipation efficiency, and become an important issue in the development of small-size, high-performance and high-heat 3C electronic products and components. Such as heat pipe, loop heat pipe (LHP), flat plate heat pipe, vapor chamber heat spreader and heat sink, capillary pumped loop Passive heat dissipation and soaking elements are also proposed in response to high heat dissipation efficiency requirements. These products all have the same characteristics: a vacuum chamber, the inner hollow portion is filled with a saturated working fluid and a capillary structure in which two phases of liquid and vapor coexist, and the distribution of the liquid is mainly affected by gravity and capillary force. When a region of capillary structure in the element is subjected to a heat source, it is defined as an evaporation zone where the working fluid will be heated to evaporate into a vapor flow, here an endothermic effect. When the steam flows to the lower part of the component, it is defined as the condensation zone, and the vapor will be condensed back into the liquid, which is an exothermic effect. Then, by the capillary force generated by the capillary structure, the liquid is guided to the capillary structure with less liquid content, that is, the evaporation zone of the heat source input, to complete the fluid circulation process in the component. The working fluid follows the heat absorption and exothermic cycling process to achieve the effect of heat transfer and heat dissipation, which is the working principle of the above heat dissipating component. With the constant evaporation and condensation of the liquid, heat can be transferred from the hot end to the cold end with minimal temperature difference.

As mentioned above, the capillary structure plays a key role in the liquid-vapor two-phase heat dissipating component. At present, the conventional liquid-vapor two-phase heat dissipating component has three kinds of internal capillary microstructures: sintered powder type and mesh shape. Structure, surface irregular microstructure (including grooved, columnar, rough surface, regular or irregular concave and convex, etc.), as shown in Figure 1 to Figure 3 (Figure 1 is the sintered powder on the wall 10 12 In Fig. 2, a mesh structure 22 is provided on the wall surface 20. Fig. 3 is provided with a surface irregularity microstructure 32 on the wall surface 30).

In the above capillary structure, the speed of the steam is increased (the vapor pressure is large) because the input heat is too large, so when the high pressure steam flows to the condensation end, the inside of the groove is caused by the excessively fast steam flow rate. The condensed liquid enthalpy is brought back to the condensing end, resulting in the replenishment of the condensed liquid at the evaporation end. This is because the interaction between the steam and the condensed liquid causes the heat sink to be ineffective, especially in the grooved structure.

Related to the prior art, such as the Republic of China Patent No. 563016, which discloses a heat sink having a heat flow conduit and a method of manufacturing the same, which form a flat plate having a plurality of V-shaped grooves by stamping or rolling Then, the capillary structure is welded to another soaking plate to form a continuous channel, and then one end opening of each heat flow channel is closed, and the two-phase heat transfer working substance is injected to seal the other end outlet. The disadvantage of this case is that the flow channels are not inter-connected, the lateral heat transfer effect is poor, and the heat transfer of the V-shaped grooves used to increase the capillary force is also poor.

The Republic of China Patent No. 435691 discloses a support capillary structure of a plate-shaped heat pipe, which is provided with at least one support body in two panels of the hot plate, and a plurality of stamped flow guiding portions (slots or protrusions) are provided on the support body. The steam of the working fluid in the heat pipe can be rapidly diffused by the flow guiding portion and quickly recirculated after being condensed into a liquid; the support body not only has the function of lifting the structural strength, but also serves as a channel for guiding the flow to accelerate the heat conduction. The disadvantage of this case is that the steam flow is not smooth and is easily blocked; and the steam is not distinguished from the condensed liquid flow path and is easy to influence each other.

U.S. Patent No. 6,952, 343 discloses a multi-layer microchannel structure for cooling, which utilizes a flow path design with a tapered tail-to-tail width to increase the capillary force of the microfluid to overcome the pressure caused by steam. Although the case can increase the capillary force, it has the disadvantage that the flow area is reduced and the condensed liquid and steam still interact.

Referring again to FIG. 6, it is an exploded view of the previous heat sink. The heat sink is designed to form a first plate 610 into a path having a plurality of heat flow conduits 611, and then solder the first plate 610 to the unprocessed second plate 620. One end of the heat flow conduit 611 is sealed, and the other end of the heat flow conduit 611 is sealed after the addition of a two-phase varying working fluid.

In order to reduce the volume of the heat flow conduit 611 and expose the heat flow conduit 611 to the largest heat dissipation surface, the heat flow conduit 611 is designed to have an upper width and a lower shape. The liquid working fluid then flows to the tip end of the heat flow conduit 611 and does not fill the entire heat flow conduit 611. The purpose is to allow the gaseous working fluid to flow to the radiation portion of the heat flow conduit 611 when the liquid working fluid is changed to a gaseous state by heat, and to conduct heat to the first flat plate 610 and the second flat plate 620 to be dispersed by the flow. Thermal energy. When the gaseous working fluid dissipates heat, it is condensed back to the liquid working fluid to form a liquid gaseous cycle for heat dissipation.

However, prior art has an inevitable deficiency. The heat sink is generally attached to the heat generating component, and the heat energy is conducted from the lower panel of the heat sink. Therefore, the heat flow conduit 611 contacts the heat generating component only at the tip end portion, and the heat energy that can be received and dissipated is limited. In addition, the amount of the liquid working fluid converted into the gaseous working fluid is not high, and it is not easy to flow at the radiating portion to form a liquid-phase heat-dissipating cycle, so the heat flow conduit 611 is a problem of wasted space.

Since the previous cases do not mention how to avoid the effect of steam and condensed liquids on the heat dissipation effect due to mutual influence; thus, the creator of the present invention has developed a flat type heat pipe having a liquid-vapor separation micro-wicking structure and A manufacturing method that overcomes the deficiencies of the prior art.

In view of the above disadvantages, the purpose of the present invention is to provide a flat-plate type heat pipe with liquid-vapor separation, which is provided with a hollow tube for fluid movement in the cavity, so as to achieve the purpose that liquid and gas do not interfere with each other.

In order to achieve the above object, the technical means of the present invention is to provide a flat type heat pipe with liquid-vapor separation, comprising: a flat-type outer casing having a sealed true An empty cavity; a hollow tube portion comprising a plurality of hollow tubes arranged in parallel in a plurality of layers, and a first opening portion and a second opening portion on both sides of the hollow tubes, the hollow tube portions having a first Space, the hollow tube portion is located in the cavity and connected to the flat type outer casing, wherein a gap between the hollow tubes and the hollow tube and the parallel plate outer casing forms a second space; and a fluid is divided into a gas a fluid of a phase and a fluid of a liquid phase, the flow system of the liquid phase being present in the second space, the flow system of the gas phase being present in the first space; wherein, when the fluid is heated, the liquid phase is converted into In the gas phase, the first opening portion may enter the first space; and when the fluid in the first space is converted into a liquid phase by the gas phase due to cooling, the second opening portion may enter the second space.

In order to enable your review committee to have a better understanding and recognition of the structural purpose and efficacy of this creation, please refer to the detailed description of the drawings as follows.

4‧‧ Flat heat pipe

10‧‧‧ wall

12‧‧‧ powder

20‧‧‧ wall

22‧‧‧Network structure

30‧‧‧ wall

32‧‧‧Microstructure

40‧‧‧Caps

42‧‧‧ hollow tube

44‧‧‧ hollow tube

46‧‧‧Caps

47‧‧‧ cavity

48‧‧‧ hollow tube

49‧‧‧ hollow tube

420‧‧‧ first opening

422‧‧‧Metal powder

440‧‧‧second opening

462‧‧‧Metal powder

50‧‧‧ flat shell

610‧‧‧ first tablet

611‧‧‧heat flow conduit

620‧‧‧ second tablet

Z1, Z3‧‧‧ first space

Z2, Z4‧‧‧ second space

Figure 1 is a schematic diagram of a capillary structure in a conventional liquid-vapor two-phase heat dissipating component; Figure 2 is a schematic diagram of a capillary structure in a conventional liquid-vapor two-phase heat dissipating component, which shows another embodiment; A schematic diagram of a capillary structure in a conventional liquid-vapor two-phase heat dissipating component, which is another embodiment; FIG. 4A is a perspective view of a flat plate type heat pipe, which is an exploded state; FIG. 4B is a creation The perspective view of the flat-plate heat pipe is a combined state; FIG. 4C is a cross-sectional view along line AA' in FIG. 4B; FIG. 4D is a partial enlarged view of FIG. 4C; FIG. 4E is a view of FIG. A cross-sectional view of the middle BB' line; Fig. 4F is another embodiment of the creation; Fig. 4G is a partial enlarged view of Fig. 4F; Fig. 5A is a sectional view of the hollow tube used in the creation; Figure 5B is a cross-sectional view of a hollow tube used in the present invention, showing another embodiment; Figure 5C is a cross-sectional view of the hollow tube used in the creation, which shows yet another embodiment; Figure 6 is a schematic exploded view of a conventional liquid-vapor two-phase heat dissipating component.

Please refer to FIG. 4A and FIG. 4B, which are respectively a perspective view of a flat type heat pipe with liquid-vapor separation, wherein FIG. 4A is an exploded state, and FIG. 4B is a combined state. The flat type heat pipe 4 of the present invention comprises: two symmetrical lid bodies 40 and a cap body 46, a hollow tube 42 and a hollow tube 44, and a working fluid (not shown). The cap 40 and the cap 46 can be combined to form a flat shell 50 and form a closed vacuum chamber 47. As shown in FIG. 4C, the hollow tube 42 and the hollow tube 44 and the working fluid are It is located in a cavity formed by the cap 40 and the cap 46. Moreover, the hollow tube 42 and the hollow tube 44 are respectively provided with a first opening portion 420 and a second opening portion 440 at both ends, and the hollow tube 42 and the hollow tube 44 form a hollow tube portion 49, and the working fluid can be borrowed. The hollow tube 42 and the hollow tube 44 are moved by capillary force. As shown in FIG. 4A, the first opening portion 420 and the second opening portions 440 are semicircular rectangles. The first opening portion 420 and the second opening portions 440 are formed by one of stamping, grinding, cutting, etching, laser, and electron beam processing.

Figure 4C is a cross-sectional view taken along line AA' in Figure 4B. In FIG. 4C, the space between the hollow tube 42 and the hollow tube 44 is the first space Z1, and the space formed between the hollow tube 42, the hollow tube 44, the cap 40 and the cap 46 is The second space Z2 (that is, the cavity space formed by the cover 40 and the cover 46 is deducted from the first space Z1 is the second space Z2).

Figure 4D is an enlarged view of the broken line portion in Figure 4C. The metal powder 422 is sintered on the inner wall of the hollow tube 42. By the arrangement of the metal powder 422, the capillary action in the first space Z1 can be strengthened.

Figure 4E is a cross-sectional view taken along line BB' in Figure 4B. The arrow indicates the circulation direction of the working fluid. When the flat heat pipe is heated at one end (the triangular symbol in the figure), the liquid working fluid in the hollow pipe 42 and the hollow pipe 44 is converted into a gas by the liquid phase due to heat. And entering the second space Z2 via the first opening portion 420 and the second opening portion 440, while the liquid phase working fluid in the first space Z1 (in the hollow tube 42 and the hollow tube 44) starts due to capillary phenomenon Mobile to fill the work caused by vaporization The fluid is vacant, and the previously vaporized working fluid returns to the other end (without the heating end) to condense, and then the condensed liquid working fluid returns to the first space Z1 via the first opening portion 420 and the second opening portion 440. (the hollow tube 42 and the hollow tube 44), thus achieving the circulation process of the heat pipe.

Referring again to Figure 4F, this figure is another embodiment of the present invention. The plurality of hollow tubes 48 arranged in parallel with each other are disposed in the closed cavity formed by the lid body 40 and the lid body 46. The space in the hollow tubes 48 is the first space Z3, and the space formed by the hollow tubes 48 and between the hollow tubes 48 and the cover 40 and the cover 46 is the second space. Z4 (that is, the cavity space formed by the cap 40 and the cap 46 is deducted from the first space Z3 to be the second space Z4). The difference from FIG. 4C is that, in FIG. 4F, the first space Z3 is a working fluid for vaporization (gas phase) as a moving channel, and the second space Z4 is a working fluid for a liquid phase as a moving channel. That is, the capillary phenomenon occurs in the second space Z4.

Referring again to FIG. 4G, it is an enlarged view of the broken line portion in FIG. The metal powder 462 is sintered on the outer wall of the hollow tube 48 and the inside of the cap 40, and the capillary action in the second space Z4 can be enhanced by the arrangement of the metal powder 462.

Referring again to FIG. 5A to FIG. 5C, these drawings are cross-sectional views of variations of the hollow tube in the present case. The cross-sectional shape of the hollow tube 42 is not limited to a circular shape, and may be a rectangle (Fig. 5A), a triangle (Fig. 5B), and a polygon (Fig. 5C). As shown in FIG. 5A to FIG. 5B, the first space Z1 and the second space Z2 are distributed as described above in FIG.

Therefore, the flat heat pipe having the liquid-vapor separation micro-capillary structure is placed in the cavity with a tubular hollow structure with openings at both ends, and the fluid in the flow direction of the flat heat pipe can be successfully changed due to the fluid phase change. Insulation, to avoid the interaction between steam and condensed liquid, it can overcome the shortcomings of the prior art, and should be patented so that the relevant industry practitioners can use it to promote industrial development.

Only those mentioned above are only the best implementation of this creation, and the scope of implementation of this creation cannot be limited. That is, the equal changes and modifications made by Dadu in accordance with the scope of patent application for this creation should still fall within the scope covered by this creation patent. The reviewer’s Mingjian, and praying for the right, is the prayer.

4‧‧‧ Flat heat pipe

40‧‧‧Caps

42‧‧‧ hollow tube

44‧‧‧ hollow tube

46‧‧‧Caps

420‧‧‧ first opening

440‧‧‧second opening

49‧‧‧ hollow tube

Claims (10)

A flat-plate heat pipe with liquid-vapor separation, comprising: a flat-type outer casing having a closed vacuum chamber; a hollow tubular portion comprising a plurality of parallel-lined plurality of hollow tubes, and two hollow tubes located in the hollow tubes a first opening portion and a second opening portion of the side, the hollow tube portions have a first space, the hollow tube portion is located in the cavity and connected to the flat type outer casing, and the hollow tubes and the hollow tube are a gap between the parallel plate outer casings constitutes a second space; and a fluid is divided into a gas phase fluid and a liquid phase fluid, the liquid phase flow system is present in the second space, the gas phase flow system Existing in the first space; wherein, when the fluid is converted into a gas phase by the liquid phase due to heat, the first opening portion can enter the first space; and when the fluid in the first space is cooled by the gas When the phase is converted into a liquid phase, the second opening can enter the second space. A flat-plate type heat pipe having a liquid-vapor separation according to the first aspect of the invention, wherein the hollow tube has a cross-sectional shape of at least one of a circle, a rectangle, a triangle, and a polygon. A flat type heat pipe having a liquid-vapor separation according to the first aspect of the invention, wherein the wall surface in contact with the second space is sintered with a metal powder. The flat type heat pipe with liquid-vapor separation according to the first aspect of the patent application, wherein the hollow pipes are connected to each other, and the connection method is one of gluing, soldering and diffusion processing. A flat type heat pipe having a liquid-vapor separation according to the first aspect of the invention, wherein the wall surface in contact with the second space is sintered with a metal powder. A flat type heat pipe having a liquid-vapor separation according to the first aspect of the patent application, wherein the flat type outer casing is made of metal. A flat type heat pipe having a liquid-vapor separation according to the first aspect of the patent application, wherein the hollow tube portion is made of metal. For example, the flat type heat pipe with liquid-vapor separation according to the first aspect of the patent application, wherein the hollow pipe portion is connected to the outer casing is one of gas welding, soldering, brazing, arc welding and solid state total crystal welding. The flat type heat pipe with liquid-vapor separation according to the first aspect of the patent application, wherein the first opening portion and the second opening portion are formed by stamping, grinding, cutting, etching, laser and electron beam processing. One of them. The flat type heat pipe having liquid-vapor separation according to the first aspect of the patent application, wherein the flat type outer casing is composed of two caps connected.