Plate type pulsating heat pipe suitable for one-way heat conduction

Abstract

The utility model discloses a plate type pulsating heat pipe suitable for unidirectional heat conduction, which comprises a bottom plate, a cover plate and a cold conduction plate, a pulsating channel is arranged on the bottom plate, and a capillary structure is arranged on the bottom plate in the pulsating channel; the cover plate is fixedly arranged on the bottom plate, so that the pulsating channel above the capillary structure forms a closed pulsating cavity; one end of the pulsating cavity is an evaporation end, and the other end of the pulsating cavity is a condensation end; the pore diameter of the capillary structure located at the evaporation end is smaller than that of the capillary structure located at the condensation end; the part, corresponding to the evaporation end, of the bottom plate is connected with heat source equipment, and the end, close to the condensation end, of the bottom plate is fixedly connected with the cold guide plate; and the pulsating cavity is filled with a liquid working medium. According to the utility model, the influence of gravitational acceleration can be effectively resisted while the heat exchange rate is improved, so that the electronic equipment can keep a good heat conduction effect under the inverse gravity.

Description

Technical Field

[0001] This utility model relates to the field of pulsating heat pipe technology. More specifically, this utility model relates to a plate-type pulsating heat pipe suitable for unidirectional heat conduction. Background Technology

[0002] Heat pipes are widely used in electronic devices, aerospace, and other technological fields because their thermal conductivity far exceeds that of metals. Due to the influence of high heat flux density heat sources, traditional pulsating heat pipes primarily rely on the flow of the working fluid within the channels for heat exchange. However, under unidirectional cooling conditions, traditional pulsating heat pipes have limited resistance to acceleration, especially under anti-gravity conditions. The condensed working fluid cannot quickly flow back to the evaporator to continue the heat exchange cycle, affecting the heat exchange efficiency of the equipment. Utility Model Content

[0003] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.

[0004] To achieve these objectives and other advantages according to this utility model, a plate-type pulsating heat pipe suitable for unidirectional heat conduction is provided, comprising: a base plate, a cover plate, and a cold-conducting plate. The base plate has pulsating channels, and a capillary structure is provided within the pulsating channels. The cover plate is fixedly disposed on the base plate, such that the pulsating channels above the capillary structure form a closed pulsating cavity. One end of the pulsating cavity is an evaporation end, and the other end is a condensation end. The pore size of the capillary structure at the evaporation end is smaller than that at the condensation end. The portion of the base plate corresponding to the evaporation end is connected to a heat source device, and the end of the base plate near the condensation end is fixedly connected to the cold-conducting plate. The pulsating cavity is filled with a liquid working fluid.

[0005] Preferably, the pulsating channel is a serpentine channel structure formed by several parallel straight channels connected end to end by a semi-circular annular channel, and the two ends of the pulsating channel are connected.

[0006] Preferably, the straight groove is provided along the length direction of the base plate, and the cross-sectional shape of the straight groove is rectangular.

[0007] Preferably, the pore size of the capillary structure located at the evaporation end is 20~50μm, and the pore size of the capillary structure located at the condensation end is 50~100μm.

[0008] Preferably, the capillary structure is formed by sintering metal powders of different particle sizes.

[0009] Preferably, the metal powder is copper powder or aluminum powder.

[0010] Preferably, the liquid working fluid has a filling rate of 40% to 50%.

[0011] This utility model has at least the following beneficial effects:

[0012] The plate-type pulsating heat pipe provided by this utility model is suitable for unidirectional heat conduction. It adds a capillary structure to the pulsating channel, increases the heat exchange surface area through the multi-pore capillary structure, improves the heat exchange capacity of the working fluid, and increases the reflux performance of the working fluid by using capillary structures with different pore sizes. While improving the heat exchange rate, it can also effectively resist the influence of gravitational acceleration, so that electronic devices can maintain good heat conduction even under the opposite gravity.

[0013] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the plate-type pulsating heat pipe suitable for unidirectional heat conduction described in this utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the pulsating channel described in this utility model;

[0016] Figure 3 for Figure 2 Schematic diagram of the AA section structure; Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0018] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] like Figures 1 to 3As shown, this utility model provides a plate-type pulsating heat pipe suitable for unidirectional heat conduction, including: a base plate 1, a cover plate 3, and a cold-conducting plate 4. The base plate 1 has pulsating channels 6, and capillary structures 5 are provided on the base plate 1 within the pulsating channels 6. The cover plate 3 is fixedly disposed on the base plate 1, so that the pulsating channels 6 above the capillary structures 5 form a closed pulsating cavity. One end of the pulsating cavity is an evaporation end, and the other end is a condensation end. The pore size of the capillary structure located at the evaporation end is smaller than that of the capillary structure located at the condensation end. The portion of the base plate 1 corresponding to the evaporation end is connected to a heat source device 2, and the end of the base plate 1 near the condensation end is fixedly connected to the cold-conducting plate 4. The pulsating cavity is filled with a liquid working fluid.

[0020] In this technical solution, the heat source device 2 is correspondingly located at the evaporation end of the pulsating cavity. The heat from the heat source device is transferred to the pulsating cavity via the base plate. After absorbing heat, the liquid working fluid evaporates into gas, which quickly fills the entire pulsating cavity. Upon entering the lower-temperature condensation end, it releases heat and condenses back into liquid. Under the action of the capillary structure 5, the liquid flows back to the evaporation end. This process is continuously repeated to dissipate heat from the heat source device 2. The condensation end of the pulsating cavity is connected to the cold-conducting plate 4 and then to the cold-conducting surface of the device, maintaining a lower temperature at the condensation end. Furthermore, considering that the smaller the pore size of the capillary structure, the greater its capillary force, the pore size of the capillary structure located at the evaporation end in the pulsating cavity is set to be smaller than that of the capillary structure located at the condensation end. Under anti-gravity conditions, the progressive capillary force still allows the liquid condensed at the condensation end to flow back to the evaporation end more quickly. Preferably, the base plate and the cover plate are joined to form a rectangular shell, and the base plate and the cover plate are made of the same material, both being rectangular structures of aluminum alloy or copper alloy. The liquid working medium can be selected from deionized water, ethylene glycol aqueous solution, perfluorotriethylamine, etc.

[0021] In another technical solution, the pulsating channel 6 is a serpentine channel structure formed by several parallel straight channels 62 connected end-to-end by semi-circular annular channels 61, and the two ends of the pulsating channel 6 are connected. The pulsating channel 6 ensures that the liquid working fluid is evenly distributed within the base plate 1, enabling uniform heat dissipation for one or more of the heat source devices 2.

[0022] Furthermore, the straight groove 61 is provided along the length direction of the base plate 1, and the cross-sectional shape of the straight groove 61 is rectangular. Preferably, the width of the straight groove is 0.5~1mm.

[0023] In another technical solution, the pore size of the capillary structure 5 located at the evaporation end is 20~50μm, and the pore size of the capillary structure 5 located at the condensation end is 50~100μm.

[0024] Specifically, the capillary structure 5 is formed by sintering metal powders of different particle sizes. The metal powders are copper powder or aluminum powder. The capillary structures of the evaporation end and the condensation end are obtained by separately sintering copper powder or aluminum powder of different particle sizes. The thickness of the capillary structure 5 does not exceed 1 / 2 of the height of the pulsating channel 6.

[0025] In another technical solution, the liquid working fluid filling rate is 40%~50%. Preferably, the liquid working fluid is filled under negative pressure, and the liquid working fluid is selected according to the actual heat exchange requirements.

[0026] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A plate-type pulsating heat pipe suitable for unidirectional heat conduction, characterized in that, include: The system comprises a base plate, a cover plate, and a cooling plate. The base plate has pulsating channels, and capillary structures are formed within these channels. The cover plate is fixedly mounted on the base plate, creating a closed pulsating cavity above the capillary structures. One end of the pulsating cavity is an evaporation end, and the other end is a condensation end. The pore size of the capillary structures at the evaporation end is smaller than that at the condensation end. The portion of the base plate corresponding to the evaporation end is connected to a heat source device, and the end of the base plate near the condensation end is fixedly connected to the cooling plate. The pulsating cavity is filled with a liquid working fluid.

2. The plate-type pulsating heat pipe suitable for unidirectional heat conduction as described in claim 1, characterized in that, The pulsating channel is a serpentine channel structure formed by several parallel straight channels connected end to end by a semi-circular annular channel, and the two ends of the pulsating channel are connected.

3. The plate-type pulsating heat pipe suitable for unidirectional heat conduction as described in claim 2, characterized in that, The straight groove is provided along the length of the base plate, and the cross-sectional shape of the straight groove is rectangular.

4. The plate-type pulsating heat pipe suitable for unidirectional heat conduction as described in claim 1, characterized in that, The capillary structure at the evaporation end has a pore size of 20~50μm, and the capillary structure at the condensation end has a pore size of 50~100μm.

5. The plate-type pulsating heat pipe suitable for unidirectional heat conduction as described in claim 4, characterized in that, The capillary structure is formed by sintering metal powders of different particle sizes.

6. The plate-type pulsating heat pipe suitable for unidirectional heat conduction as described in claim 5, characterized in that, The metal powder is copper powder or aluminum powder.

7. The plate-type pulsating heat pipe suitable for unidirectional heat conduction as described in claim 1, characterized in that, The liquid working fluid has a filling rate of 40% to 50%.

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