A method for processing and manufacturing a high-temperature heat pipe capillary channel wick

Abstract

The application discloses a kind of high-temperature heat pipe dry channel type wick processing and manufacturing method, including steps: dry channel processing, high-temperature fixing, silk screen winding, silk screen fixing, impurity removal, high-temperature shaping.The application proposes a kind of high-temperature heat pipe processing and manufacturing process method for high-temperature heat pipe, can realize the standard manufacture of high-temperature heat pipe dry channel type wick, guarantee the excellent heat transfer performance of high-temperature heat pipe.

Description

Technical Field

[0001] This invention relates to the field of nuclear power technology, specifically to a method for manufacturing a high-temperature heat pipe mains wick. Background Technology

[0002] A heat pipe is a passive heat transfer device that utilizes the phase change (evaporation and condensation) of the working fluid. Compared to traditional devices, heat pipes offer improved heat transfer efficiency through simplified structure and avoid single-point failures. In a dry-channel wick high-temperature heat pipe, the liquid working fluid primarily flows circumferentially along the pipe wall and axially within the dry channel. The shorter circumferential flow path and lower flow resistance within the dry channel result in high heat transfer capacity and low radial thermal resistance, significantly improving the capillary limit of the heat pipe. However, the dry channel section in a dry-channel wick is difficult to process, and its small diameter makes it difficult to fix to the wire mesh; the related processes remain unclear. Summary of the Invention

[0003] To facilitate the planning of the high-temperature heat pipe dry-channel wicking process, this invention provides a method for manufacturing a high-temperature heat pipe dry-channel wicking. This method processes the dry channel, employs high-temperature sintering to ensure the stability of the dry channel and wire mesh structure strength, and uses a fixing and mold method to roll the dry-channel wicking, thus realizing the manufacturing of a high-temperature heat pipe dry-channel wicking and ensuring the performance of the high-temperature heat pipe.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A method for manufacturing a high-temperature heat pipe dry-channel wick includes the following steps:

[0006] Step 1: Main Channel Processing: Determine the radius of the main channel and its axial position after the wire mesh is laid out. Open the mold on both sides of the hydraulic press mold 1, one side being a raised small circle and the other a recessed small circle. The size of the small circle is consistent with the radius of the main channel. Place the stainless steel wire mesh 2 on the hydraulic press mold 1, and use pressure to press the raised semi-circular channels onto the stainless steel wire mesh 2.

[0007] Step 2: High-temperature fixing: The stainless steel wire mesh 2 with the semi-circular channel is placed in the high-temperature vacuum furnace 3 for high-temperature vacuum sintering treatment to ensure the strength of the stainless steel wire mesh 2 and the semi-circular channel.

[0008] Step 3: Wire Mesh Rolling: Calculate the location of the main channel and the distance between the main channels, and manufacture a rolling mold rod 4 with grooves; roll the stainless steel wire mesh 2 radially onto the rolling mold rod 4, ensuring that the raised semi-circular grooves correspond to the grooves of the rolling mold rod. After the first layer of wire mesh with semi-circular grooves is rolled, the subsequent wire meshes are evenly rolled on the outside of the first layer of wire mesh, with the two ends of the semi-circular grooves tightly attached to the outer layer of wire mesh to form the main channel structure;

[0009] Step 4: Wire mesh fixing: Fix the rolled dry-type wire mesh liquid absorbent core 5 with the mold. Use welding machine 6 to spot weld the rolled gap along the axial direction of the dry-type wire mesh liquid absorbent core 5 to fix the dry-type wire mesh liquid absorbent core 5 and maintain the integrity of the dry-type shape.

[0010] Step 5: Impurity removal: Remove the rolling die rod 4, and use an ultrasonic cleaner 7 to clean the dry-type wire mesh liquid absorption core 5 to remove residual grease, oxide layer and rust from the material, ensuring that the dry-type wire mesh liquid absorption core 5 is clean and free of impurities.

[0011] Step 6: High-temperature setting: Place the fixed dry-channel wire mesh liquid absorbent core 5 into a high-temperature oven and bake at high temperature 8 to set the shape of the dry-channel liquid absorbent core and ensure the strength of the liquid absorbent core.

[0012] In step 1, the stainless steel wire mesh 2 is made of 316L stainless steel alloy, with a mesh count of 400 and a wire diameter of 0.28 mm.

[0013] In step 2, the vacuum level of the high-temperature vacuum furnace 3 is maintained at 1.2 × 10⁻⁶. -2 Pa, heating temperature maintained at 400℃~500℃, heating time 4~6 hours.

[0014] In step 3, quartz glass fiber is used as the material for the rolling die rod 4 to ensure convenient demolding after the liquid-absorbing core is rolled. The groove diameter of the rolling die rod 4 is 2 mm larger than the diameter of the wire mesh main channel to ensure the integrity of the main channel structure during the rolling process.

[0015] In step 4, the welding machine 6 uses argon gas shielded welding to weld the wire mesh gaps. The diameter of the weld spot is 0.2 to 0.3 mm and the spacing between weld spots is 0.1 to 0.2 mm.

[0016] In step 5, all impurity removal steps are performed using an ultrasonic cleaner 7. Metal degreaser is used to remove residual grease, a mixture of 10% nitric acid and 5% hydrofluoric acid is used to remove oxide layers and rust, deionized water is used to remove residual acidic solution, and isopropanol is used to remove residual water droplets.

[0017] In step 6, specifically, the completed dry-channel wire mesh liquid-absorbing core 5 is placed in a high-temperature oven 8 for high-temperature baking at a temperature of 300-450°C for a duration of 360-480 minutes.

[0018] In step 6, the high-temperature oven 8 is a nitrogen-filled oven to ensure that the surface of the dry-channel wire mesh liquid-absorbing core 5 is not oxidized during baking.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] This invention uses a pressed and sintered semi-circular channel as the main channel structure, which can provide sufficient capillary force to ensure that the working fluid inside the heat pipe enters the main channel. At the same time, it ensures the strength of the small-diameter main channel structure. For fixing the main channel, argon-protected welding is used to weld the wire mesh gaps to ensure a tight connection between the main channel and the wire mesh, avoid flow resistance, and control the position of the welding points to avoid the decrease in the permeability of the absorbent core. For the rolling of the main channel absorbent core, a fixing and mold method is used to ensure the fixation of the main channel during the rolling process.

[0021] This invention addresses the problem of how to manufacture and process high-temperature heat pipe dry-channel wicks, and proposes a manufacturing method for high-temperature heat pipe dry-channel wicks. This invention has a standardized process, high feasibility, and can realize the standardized manufacturing of dry-channel wicks. Attached Figure Description

[0022] Figure 1 This is a flowchart illustrating the manufacturing process of a high-temperature heat pipe trunking liquid wick.

[0023] Figure 2 This is a schematic diagram of the processing flow of a high-temperature heat pipe trunking liquid wick. Detailed Implementation

[0024] The present invention will now be further described with reference to examples and accompanying drawings:

[0025] like Figure 1 and Figure 2 As shown, the present invention discloses a method for manufacturing a high-temperature heat pipe mains-type liquid wick, comprising the following steps:

[0026] Step 1: Main Channel Processing: Determine the radius of the main channel and its axial position after the wire mesh is laid out. Open the mold on both sides of the hydraulic press mold 1, one side being a raised small circle and the other a recessed small circle. The size of the small circles is consistent with the radius of the main channel. Place the stainless steel wire mesh 2 on the hydraulic press mold 1, and use pressure to press the raised semi-circular channels onto the stainless steel wire mesh 2.

[0027] Step 2: High-temperature fixing: The stainless steel wire mesh 2 with semi-circular channels is placed in a high-temperature vacuum furnace 3 for high-temperature vacuum sintering treatment. The vacuum degree of the high-temperature vacuum furnace 3 is maintained at 1.2 × 10⁻⁶. -2 Pa, heating temperature maintained at 400℃~500℃, heating time 4~6 hours, to ensure the strength of stainless steel wire mesh 2 and semi-circular channel.

[0028] Step 3: Wire Mesh Rolling: Calculate the location of the main channel and the distance between the main channels, and manufacture a rolling die rod 4 with grooves. Roll the stainless steel wire mesh 2 radially onto the rolling die rod 4, ensuring that the raised semi-circular grooves correspond to the grooves of the rolling die rod. After the first layer of wire mesh with semi-circular grooves is rolled, the subsequent wire meshes are evenly rolled on the outside of the first layer of wire mesh, with the two ends of the semi-circular grooves tightly attached to the outer layer of wire mesh, forming the main channel structure.

[0029] Step 4: Wire Mesh Fixing: Fix the rolled-up main channel wire mesh liquid absorbent core 5 with the mold by using a welding machine 6 to spot weld the rolled seam along the axial direction of the main channel wire mesh liquid absorbent core 5 to fix the main channel wire mesh liquid absorbent core 5 and maintain the integrity of the main channel shape.

[0030] Step 5: Impurity Removal: Remove the rolling die rod 4. Clean the dry-type wire mesh absorbent core 5 with an ultrasonic cleaner 7. Use a metal degreaser to remove residual grease. Use a mixture of 10% nitric acid and 5% hydrofluoric acid to remove the oxide layer and rust. Use deionized water to remove residual acidic solution. Use isopropanol to remove residual water droplets to ensure that the dry-type wire mesh absorbent core 5 is clean and free of impurities.

[0031] Step 6: High-temperature setting: Place the completed dry channel wire mesh liquid absorption core 5 into a high-temperature oven for high-temperature baking at a temperature of 300-450℃ for 360-480 minutes to set the shape of the dry channel liquid absorption core and ensure its strength.

[0032] In a preferred embodiment of the present invention, the stainless steel wire mesh 2 is made of 316L stainless steel alloy, with a mesh count of 400 and a wire diameter of 0.28 mm.

[0033] In a preferred embodiment of the present invention, the rolling die rod 4 is made of quartz glass fiber to ensure convenient demolding after the liquid-absorbing core is rolled. The groove diameter of the rolling die rod 4 is 2 mm larger than the diameter of the wire mesh main channel to ensure the integrity of the main channel structure during the rolling process.

[0034] In a preferred embodiment of the present invention, the welding machine 6 uses argon-shielded welding to weld the wire mesh gaps, with a weld spot diameter of 0.2 to 0.3 mm and a weld spot spacing of 0.1 to 0.2 mm.

[0035] As a preferred embodiment of the present invention, the high-temperature oven 8 is a nitrogen-filled oven to ensure that the surface of the dry-channel wire mesh liquid-absorbing core 5 is not oxidized during baking.

Claims

1. A method for manufacturing a high-temperature heat pipe mains-type liquid wick, characterized in that: The steps are as follows: Step 1: Main channel processing: Determine the radius of the main channel and the axial position after the wire mesh is laid out. Open the mold on both sides of the hydraulic press mold (1). One side is a raised small circle and the other side is a recessed small circle. The size of the small circle is consistent with the radius of the main channel. Place the stainless steel wire mesh (2) on the hydraulic press mold (1) and use pressure to press the raised semi-circular channel on the stainless steel wire mesh (2). Step 2: High temperature fixing: The stainless steel wire mesh (2) with semi-circular channels is placed in a high temperature vacuum furnace (3) for high temperature vacuum sintering treatment to ensure the strength of the stainless steel wire mesh (2) and the semi-circular channels. Step 3: Wire mesh rolling: Calculate the location of the main channel and the distance between the main channels, and manufacture a rolling mold rod (4) with grooves; roll the stainless steel wire mesh (2) radially onto the rolling mold rod (4), ensuring that the raised semi-circular grooves correspond to the grooves of the rolling mold rod. After the first layer of wire mesh with semi-circular grooves is rolled, the subsequent wire mesh is evenly rolled on the outside of the first layer of wire mesh, and the two ends of the semi-circular grooves are tightly attached to the outer layer of wire mesh to form the main channel structure. Step 4: Wire mesh fixing: Fix the rolled dry wire mesh liquid absorbent core (5) with mold. Use a welding machine (6) to spot weld the rolled gap along the axial direction of the dry wire mesh liquid absorbent core (5) to fix the dry wire mesh liquid absorbent core (5) and maintain the integrity of the dry shape. Step 5: Impurity removal: Remove the rolling die rod (4), and use an ultrasonic cleaner (7) to clean the dry-type wire mesh liquid absorption core (5) to remove residual grease, oxide layer and rust from the material, so as to ensure that the dry-type wire mesh liquid absorption core (5) is clean and free of impurities. Step 6: High-temperature setting: Place the fixed dry-channel wire mesh liquid absorbent core (5) into a high-temperature oven (8) for high-temperature baking to set the shape of the dry-channel liquid absorbent core and ensure the strength of the liquid absorbent core.

2. The method for manufacturing a high-temperature heat pipe trunking wick according to claim 1, characterized in that: In step 1, the stainless steel wire mesh (2) is made of 316L stainless steel alloy, with a mesh count of 400 and a wire diameter of 0.28 mm.

3. The method for manufacturing a high-temperature heat pipe mains-type liquid wick according to claim 1, characterized in that: In the step 2, the high-temperature vacuum furnace (3) maintains the vacuum degree of 1.2 x 10 -2 Pa, the heating temperature is maintained at 400-500℃, and the heating time is 4-6 hours.

4. The method for manufacturing a high-temperature heat pipe trunking wick according to claim 1, characterized in that: In step 3, quartz glass fiber is used as the material of the rolling mold rod (4) to ensure convenient demolding after the liquid absorption core is rolled; the groove diameter of the rolling mold rod (4) is 2 mm larger than the diameter of the wire mesh main channel to ensure the integrity of the main channel structure during the rolling process.

5. The method for manufacturing a high-temperature heat pipe trunking wick according to claim 1, characterized in that: In step 4, the welding machine (6) uses argon gas shielded welding to weld the wire mesh gaps. The diameter of the weld spot is 0.2 to 0.3 mm and the distance between the weld spots is 0.1 to 0.2 mm.

6. The method for manufacturing a high-temperature heat pipe mains-type liquid wick according to claim 1, characterized in that: In step 5, impurities are removed using an ultrasonic cleaner (7), residual grease is removed using a metal degreaser, oxide layer and rust are removed using a mixture of 10% nitric acid and 5% hydrofluoric acid, residual acidic solution is removed using deionized water, and residual water droplets are removed using isopropanol.

7. The method for manufacturing a high-temperature heat pipe mains-type liquid wick according to claim 1, characterized in that: In step 6, specifically, the completed dry-channel wire mesh liquid-absorbing core (5) is placed in a high-temperature oven (8) for high-temperature baking at a temperature of 300-450°C for a duration of 360-480 minutes.

8. The method for manufacturing a high-temperature heat pipe trunking wick according to claim 1, characterized in that: In step 6, the high-temperature oven (8) is a nitrogen-filled oven to ensure that the surface of the dry-channel wire mesh liquid absorption core (5) is not oxidized during baking.

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