A microcapillary circuit

Abstract

The invention discloses a micro capillary loop, which comprises a tube shell and a filling pipe, wherein the inside of the tube shell is a ring cavity, and the filling pipe is outside the tube shell and communicates with the ring cavity. The tube shell is provided with a first capillary core and a second capillary core. The cross section of the main part of the first capillary core completely occupies the cross section of the ring cavity, and the rest part of the first capillary core is arranged on one side or both sides of the main part of the first capillary core, and the cross section of the rest part of the first capillary core occupies a part of the cross section of the ring cavity. The second capillary core is continuously arranged in the ring cavity and connected with the first capillary core at least at one end. The heat transfer capacity of the micro capillary loop is greatly improved compared with the same volume heat pipe, and the micro capillary loop can support the heat dissipation of multiple dispersed heat sources, has the advantages of small volume, high efficiency, reliability and low cost, and can be used in communication terminals such as mobile phones, and has great economic value.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of heat dissipation, and relates to a micro capillary loop. BACKGROUND

[0002] With the promotion of 5G technology, the heat power of chips in terminal devices such as mobile phones increases dramatically, and the power consumption of modules such as radio frequency antennas has increased and cannot be simply dissipated. The single heat transfer capacity of the ultra-thin heat pipe currently used is small, and it cannot well meet the heat dissipation demand. Moreover, when multiple heat sources in the device are far apart, multiple heat pipes need to be used, causing the layout of the heat dissipation system to be complex and the reliability to be reduced. Therefore, a heat transfer element with greater heat transfer capacity and suitable for narrow space is needed to better solve the above problems. SUMMARY

[0003] In order to solve the problem that the heat dissipation of some electronic components in portable devices is bottlenecked by the large heat power, the application provides a micro capillary loop, which has the advantages of small volume, high efficiency, reliability and low cost, and has great economic value.

[0004] The application adopts the following technical scheme:

[0005] A micro capillary loop comprises a pipe shell and a filling pipe, and is characterized in that:

[0006] The pipe shell is internally provided with an annular cavity, and the filling pipe is located outside the pipe shell and communicates with the annular cavity.

[0007] The pipe shell is internally provided with a first capillary core, the first capillary core is connected with the inner wall of the pipe shell, the cross section of the main part of the first capillary core completely occupies the cross section of the annular cavity at the position, the residual part of the first capillary core is located on one side or both sides of the main part of the first capillary core, and the cross section of the residual part of the first capillary core occupies a part of the cross section of the annular cavity at the position.

[0008] The pipe shell is internally provided with a second capillary core, the second capillary core is continuously arranged along the path direction of the annular cavity, and at least one end of the second capillary core is connected with the first capillary core, and the cross section of the second capillary core occupies a part of the cross section of the annular cavity.

[0009] The first capillary core is a powder sintered porous structure.

[0010] The shape and / or size of the cross section of the annular cavity are different along the path direction of the annular cavity.

[0011] The shape and / or size of the cross section of the second capillary core are different along the length direction.

[0012] The second capillary core is one or a combination of powder sintering, wire mesh, foam metal, and metal felt.

[0013] Optionally, the second capillary core is at least partially metallurgically bonded with the tube shell.

[0014] Optionally, the second capillary core is in contact with the tube shell without metallurgical bonding.

[0015] Optionally, the tube shell is formed by stamping and welding of two metal sheets, and the liquid-filled tube is located at any of the welding positions.

[0016] Optionally, the metal sheet has a hollowed-out portion and a mounting hole.

[0017] Advantages of the present application

[0018] The present application has the following outstanding advantages over the prior art:

[0019] 1. In the present application, the gaseous working medium and the liquid working medium flow in the same direction, and the liquid working medium is mainly transported through the cavity inside the tube shell rather than through the capillary structure in the heat pipe, thus the flow resistance is small and the heat transfer capacity is large.

[0020] 2. In the present application, the second capillary core can provide heat dissipation for the heat source. The heat dissipation principle is similar to that of a heat pipe, i.e. the second capillary core absorbs the condensed liquid in the annular cavity, and then the liquid vaporizes at the second capillary core in the heat source area, thereby dissipating heat from the heat source in this area.

[0021] 3. The micro-capillary circuit of the present application has a simple structure, is easy to use, and is reliable in operation, thus being conducive to popularization.

[0022] The micro-capillary circuit of the present application relies on capillary force to drive the working medium to circulate, and converts heat through phase change, thus having the advantages of small size, high efficiency, reliability, and low cost, and can be used in communication terminals such as mobile phones, thus having great economic value. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Fig. 1 is a schematic diagram of the symmetric cross-sectional structure of the first embodiment of the micro-capillary circuit of the present application;

[0024] Figure 2 Fig. 2 is a schematic diagram of the symmetric cross-sectional structure of the second embodiment of the micro-capillary circuit of the present application;

[0025] Figure 3a Fig. 3 is a schematic diagram of the cross-sectional structure of the first embodiment of the second capillary core in the present application;

[0026] Figure 3b Fig. 4 is a schematic diagram of the cross-sectional structure of the second embodiment of the second capillary core in the present application;

[0027] Figure 3c Fig. 3 is a schematic diagram of the cross-sectional structure of a third embodiment of the second capillary core described in the present application;

[0028] Figure 4 Fig. 4 is a schematic diagram of the structure of a third embodiment of the micro capillary circuit described in the present application;

[0029] In the above figure: 1 - tube shell, 2 - first capillary core, 3 - second capillary core, 4 - filling tube, 31 - partial area in the annular cavity, 11, 12 - copper plate, 13 - weld, 101 - mounting hole, 102 - hollowed-out part. DETAILED DESCRIPTION

[0030] Figure 1 Fig. 1 is a schematic diagram of the symmetric cross-sectional structure of a first embodiment of the micro capillary circuit described in the present application. It includes: a tube shell 1, a first capillary core 2, a second capillary core 3, and a filling tube 4.

[0031] The tube shell 1 is formed by a copper tube through end-to-end welding, and a filling tube 4 is provided at the weld. The filling tube 4 is a copper tube with a smaller diameter than the tube shell 1 and is in communication with the internal annular cavity of the tube shell 1. The connection is by welding, and all the welds of the micro capillary circuit in this embodiment have sealing functions. The first capillary core 2 is located inside the tube shell 1 and close to the end of the tube shell 1. The first capillary core 2 adopts a powder sintered porous structure, and its outer surface is sintered together with the inner wall of the tube shell 1 at the corresponding position. The main part of the first capillary core 2 completely occupies the cross-section of the annular cavity at the location, thereby blocking the annular cavity at this location to achieve the purpose of preventing gas from passing through the block but allowing liquid to pass through the block. The remaining part of the first capillary core 2 is located on both sides of the main part of the first capillary core 2 and occupies a part of the cross-section of the annular cavity at the location. Among them, the remaining part of the first capillary core 2 at the heat input position is connected with the second capillary core 3, and this connection is achieved by pre-installing the second capillary core 3 and the metal powder used for sintering the first capillary core 2 inside the tube shell 1 and then sintering at high temperature.

[0032] The second capillary core 3 is composed of multiple layers of wire mesh and is continuously arranged along the path direction of the annular cavity inside the annular cavity except the first capillary core 2, and occupies a part of the flow area of the annular cavity, but the second capillary core 3 is not sintered together with the tube shell 1 as a whole.

[0033] Specific working principle: the pipe shell 1 is filled with a proper amount of working medium, heat is input from the rest of the first capillary core 2, thus causing the working medium to vaporize and produce steam, since the main part of the first capillary core 2 is infiltrated by the liquid working medium, the steam cannot pass through the main part of the first capillary core 2, but only flows to the other side of the first capillary core 2 through the annular cavity, and the steam gradually releases heat and condenses into liquid during the flowing process, the liquid is pushed to the other side of the first capillary core 2 and is absorbed and transported to the vaporization place of the first capillary core 2 to continue the next cycle. The second capillary core 3 can enhance the reliability of the liquid return to the first capillary core 2.

[0034] Figure 2 The second embodiment of the micro-capillary loop is shown. As Figure 2 shown,

[0035] The cross-sectional shape and size of the internal annular cavity of the pipe shell 1 in this embodiment change in stages along the annular path direction, and the cross-sectional shape and size of the second capillary core 3 change in stages along the length direction. At the position of the illustrated area 31, the second capillary core 3 covers more of the inner surface of the pipe shell 1 than at other positions, and is connected together with the inner wall of the pipe shell 1 at this position, and can dissipate heat for the heat source at this position. The heat dissipation principle is consistent with that of a heat pipe, that is, the second capillary core 3 can absorb the condensed liquid in the annular cavity, and then vaporize at the area 31, thereby dissipating heat for the heat source at this area. The structure and working principle of the other parts of this embodiment are the same as those of the first embodiment of the micro-capillary loop, and will not be described again.

[0036] Figure 3a 、 3b , 3c takes the circular pipe shell 1 as an example, and shows the positional relationship between the second capillary core 3 and the pipe shell 1. Obviously, the pipe shell 1 can not only be a circular pipe, but also a flat pipe, or a structure in which one part is a circular pipe and the other part is a flat pipe.

[0037] As Figure 3a shown, the second capillary core 3 completely covers the inner wall of the pipe shell 1 at the corresponding position, and the two are metallurgically combined or in contact.

[0038] As Figure 3b shown, the second capillary core 3 covers part of the inner wall of the pipe shell 1 at the corresponding position, and the two are metallurgically combined or in contact.

[0039] As Figure 3c shown, the second capillary core 3 is not connected with the inner wall of the pipe shell 1 at this cross section, but along the length direction of the second capillary core 3, the two are locally metallurgically combined or in contact.

[0040] Figure 4The third embodiment of the micro-capillary circuit is shown. In this embodiment, the tube shell 1 is formed by stamping and welding of the copper plate 11 and the copper plate 12, the weld 13 is located at the edge of the copper plate 11 and contacts the copper plate 12, and the filling tube 4 is arranged at any position of the weld 13. On the copper plate 12 outside the weld sealing area, the mounting hole 101 and the hollow part 102 are processed for compatibility with the surrounding structure. The structure and working principle of other parts of this embodiment are the same as those of the first embodiment of the micro-capillary circuit, and will not be repeated here.

[0041] In summary, the above embodiments of the micro-capillary circuit of the present application, the micro-capillary circuit of the present application relies on capillary force to drive the working fluid circulation, and converts heat through phase change, has the advantages of small volume, high efficiency, reliability and low cost, and can be used in mobile phones and other similar communication terminals, and has great economic value.

[0042] Finally, it should be emphasized that the above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A miniature capillary circuit, comprising: The casing and filling tube are characterized by: The inside of the tube shell is an annular cavity, and the filling tube is located outside the tube shell and communicates with the annular cavity; The tube shell contains a first capillary core, which is connected to the inner wall of the tube shell. The cross-section of the main part of the first capillary core completely occupies the cross-section of the annular cavity at its location. The remaining part of the first capillary core is located on either side or both sides of the main part of the first capillary core. The cross-section of the remaining part of the first capillary core occupies a portion of the cross-section of the annular cavity at its location. The tube shell contains a second capillary core, which is continuously arranged along the path of the annular cavity and at least one end is connected to the first capillary core. The cross-section of the second capillary core occupies a portion of the cross-section of the annular cavity.

2. The micro capillary circuit according to claim 1, characterized in that: The first capillary core has a powder sintered porous structure.

3. The micro capillary circuit according to claim 1, characterized in that: The shape and / or size of the cross-section of the annular cavity differs along the path direction of the annular cavity.

4. The micro capillary circuit according to claim 1, characterized in that: The shape and / or size of the cross-section of the second capillary core differ along its length.

5. The micro capillary circuit according to claim 1, characterized in that: The second capillary core is one or a combination of several of the following: powder sintering, wire mesh, foam metal, and metal felt.

6. The micro capillary circuit according to claim 1, characterized in that: The second capillary core is at least partially metallurgically bonded to the tube shell.

7. The microcapillary circuit according to claim 1, characterized in that: The second capillary core is in contact with the tube shell, and there is no metallurgical bonding.

8. The micro capillary circuit according to claim 1, characterized in that: The shell is formed by stamping and welding two metal plates, and the filling tube is located at any of the welding positions.

9. The microcapillary circuit according to claim 8, characterized in that: The metal plate has a hollowed-out section and mounting holes.

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