A low-temperature lock cabinet heat dissipation assembly assembly welding processing method and assembly welding clamp

Abstract

The application discloses a kind of low-temperature lock cabinet heat dissipation assembly group welding processing method and assembly welding fixture, method includes: the outer fin of aluminium alloy material is plated with nickel layer on the surface of heat pipe;The flanging treatment is carried out to each side of the hole of inner fin of red copper material;Into outer fin;Into inner fin layer by layer, after every layer of inner fin, solder is coated in the joint of inner fin hole and heat pipe, and ensure that the spacing of each inner fin layer is consistent;Into another outer fin;Left stabilizing piece and right stabilizing piece that are coated with solder are fixed on the two sides of inner fin;Solder is coated on the contact surface of heat conduction block and heat pipe, and the two are pressed tightly;Carry out brazing.The application designs stainless steel material's assembly, welding dual-purpose fixture according to the structural characteristics of heat dissipation assembly, product assembly combination is completed on the fixture, after solder feeding, the fixture is directly entered into resistance furnace together with product to carry out brazing, the fixture can control thermal deformation of high-temperature brazing process to the maximum, and reach product design size precision requirement.

Description

Technical Field

[0001] This invention relates to the field of cryogenic lock cabinet technology for spacecraft, and in particular to a method for welding heat dissipation components of cryogenic lock cabinets for spacecraft and an assembly welding fixture. Background Technology

[0002] With the development of science and technology, my country has strengthened its research and application of space technology and has established its own space station. To ensure the normal operation of the space station, it is necessary to continuously transport food, medicine, and scientific experimental samples. The cargo support subsystem of the cargo spacecraft is responsible for this transportation. Within this subsystem, the cryogenic locker unit is a crucial piece of equipment, providing a suitable low-temperature storage environment for important items (astronaut food, medicine, and scientific experimental samples). The cryogenic locker (also known as a "space refrigerator") is similar to a refrigerator used in daily life. While both provide insulation, the cryogenic locker has higher requirements for insulation materials. It must not only have superior insulation performance but also be lightweight, compact, and absolutely flame-retardant, achieving maximum weight reduction and efficient utilization of the spacecraft's internal space while meeting basic safety and insulation requirements. The heat dissipation component is a vital part of the cryogenic locker unit, playing a crucial role in ensuring its performance meets overall requirements and is considered a key component of the entire system.

[0003] Among numerous heat dissipation components, heat pipe technology is currently one of the more advanced technologies, boasting advantages such as small size and significant heat dissipation effect, and has been widely applied in various fields of industrial technology. Typically, heat pipes and heat sink fins are made of the same material or mechanically clamped together. Because the contact between the heat pipe and fins is solely mechanical, the interface thermal resistance is relatively high, hindering heat conduction and creating a significant temperature difference at the junction of the heat pipe and fins. This reduces the heat dissipation performance of the heat pipe. To further improve heat dissipation performance and ensure that the overall performance indicators of the cryogenic cabinet far exceed those of similar aerospace products such as those used on the International Space Station, further improvements are needed. Summary of the Invention

[0004] This invention provides a method for welding a low-temperature lock cabinet heat dissipation component and an assembly welding fixture to solve the technical problems in the prior art.

[0005] The technical solution adopted in this invention is: to provide a method for welding a low-temperature lock cabinet heat dissipation assembly, comprising:

[0006] The outer fins and heat pipes made of aluminum alloy are plated with a nickel layer.

[0007] The inner fins made of copper are flanged at all square holes and on both sides.

[0008] Place the outer fins at the bottom of the positioned heat pipe; when assembling several inner fins of the heat dissipation assembly, insert the square holes of the inner fins into the heat pipe layer by layer. After each layer of inner fins is installed, apply solder to the contact gap between the square holes of the inner fins and the heat pipe, and ensure that the spacing between each layer of inner fins is consistent; place another outer fin on top of the heat pipe.

[0009] A left-side stabilizing plate and a right-side stabilizing plate are fixed on both sides of the inner fin flange treatment, and the contact surfaces of the left-side stabilizing plate and the right-side stabilizing plate with the inner fin are coated with brazing filler metal.

[0010] Apply solder to the contact surfaces of the heat-conducting block and the heat pipe, and press them together.

[0011] After the heat dissipation components are assembled, brazing is performed to evenly immerse the brazing filler metal into the contact gap between the square holes of the inner fins and the heat pipe, thereby fixing the left and right stabilizing plates to both sides of the inner fins and welding the heat-conducting blocks to the heat pipes.

[0012] Furthermore, solder is also applied to the gaps where the square holes of the outer fins at the bottom and top of the heat pipe contact the heat pipe.

[0013] Furthermore, the solder is a needle-shaped lead-tin paste soft solder.

[0014] Furthermore, brazing is performed using an electric resistance furnace.

[0015] The present invention also provides a welding fixture for assembling heat dissipation components of a low-temperature lock cabinet, comprising:

[0016] Base plate;

[0017] Side support, mounted on the base plate, for the outer fins at the bottom of the heat pipe;

[0018] A heat pipe fixing mechanism is detachably mounted on the base plate to fix the heat pipe of the heat dissipation component on the base plate and to fix the heat-conducting block of the heat dissipation component on the heat pipe.

[0019] A partition support frame, which is detachable and vertically mounted on the base plate;

[0020] The partition plate is horizontally slidably mounted on the partition plate support frame at both ends to support the inner fins of each layer of the heat dissipation assembly, so that the spacing of the inner fins of each layer is consistent and does not deform.

[0021] The downward pressure mechanism is horizontally installed on the top of the partition support frame and is used to apply uniform downward pressure to the outer fins at the top of the heat pipe.

[0022] The side stabilizer positioning mechanism is detachably mounted on the base plate, side support, or middle support set on the base plate, and is used to apply horizontal pressure to the left and right stabilizers of the heat dissipation assembly.

[0023] When assembling the inner fins of the heat dissipation assembly using the assembly welding fixture, a partition is placed after each layer of inner fins is installed, and brazing filler metal is applied to the contact gap between the square hole of the inner fin and the heat pipe. After the heat dissipation assembly is assembled, brazing is used to make the brazing filler metal evenly adhere to the contact gap between the square hole of the inner fin and the heat pipe, so that the left and right stabilizing plates are welded to both sides of the inner fins, and the heat-conducting block is welded to the heat pipe.

[0024] Furthermore, the heat pipe fixing mechanism includes a positioning block, a lower pressing block, a toothed top block, and a pressure plate; the toothed top block, after being connected to tightening screws at both ends, is placed in the mounting groove of the base plate, and has multiple protruding teeth for placing the heat pipe; the positioning block is installed on the base plate for positioning the heat-conducting block; the lower pressing block is installed on the base plate for pressing the heat-conducting block of the heat dissipation assembly onto the base plate, and the heat-conducting block is located above the toothed top block and the heat pipe; rotating the tightening screws can raise the toothed top block and press the heat pipe against the heat-conducting block; the pressure plate is installed on the base plate by screws for fixing the heat pipe between the inner fins and the heat-conducting block.

[0025] Furthermore, the partition support frame is a screw rod, and the screw rod includes at least two sets, two in each set, symmetrically installed on the base plate; the partition plate has through holes at both ends that mate with the screw rod; the pressing mechanism includes a pressure bar and a shouldered hexagonal nut, the pressure bar has through holes at both ends that mate with the screw rod, and the shouldered hexagonal nut is installed on the top of each screw rod to apply downward pressure to the pressure bar; the assembly welding fixture is made of stainless steel except for the partition plate, which is made of carbon steel.

[0026] Furthermore, the side stabilizing plate positioning mechanism includes a side positioning plate and a side pressure plate arranged opposite to each other. The side positioning plate and the side pressure plate are located on both sides of the partition support frame. The middle part of the side positioning plate, the side pressure plate, and the partition support frame is the area for assembling the inner fins. Both the side positioning plate and the side pressure plate are provided with multiple knurled screws. The side positioning plate is also provided with pins that connect to the outer fins at the bottom and top of the heat pipe. By rotating the knurled screws on the side positioning plate and the side pressure plate, horizontal pressure is applied to the left and right stabilizing plates of the heat dissipation assembly.

[0027] The present invention also provides a method for welding a low-temperature lock cabinet heat dissipation assembly, comprising:

[0028] The outer fins and heat pipes made of aluminum alloy are plated with a nickel layer.

[0029] The inner fins made of copper are flanged at all square holes and on both sides.

[0030] Cleaning: Clean the outer fins, heat pipes, and inner fins;

[0031] Assembly: The assembly and welding fixtures are used to assemble the outer fins, heat pipes, heat-conducting blocks, inner fins, left-side stabilizing plate, and right-side stabilizing plate to form a heat dissipation assembly.

[0032] Brazing involves heating the heat pipe in an electric resistance furnace to evenly adhere the brazing filler metal to the contact gap between the square hole of the inner fin and the heat pipe, thereby fixing the left and right stabilizing plates to both sides of the inner fin and fixing the heat-conducting block to the heat pipe.

[0033] Disassemble and remove the assembly welding fixture from the heat dissipation assembly;

[0034] Cleaning and drying;

[0035] Inspection and performance testing.

[0036] Furthermore, the assembly process includes:

[0037] The heat pipe is fixed to the base plate using a heat pipe fixing mechanism;

[0038] Pass the square holes of the outer fins through the heat pipe and place them on the side support;

[0039] After applying solder to the contact surface of the heat-conducting block, install it onto the heat pipe and press the heat-conducting block tightly against the heat pipe.

[0040] Insert one layer of partition into the partition support frame;

[0041] Pass the heat pipe through the square hole of the inner fin, and apply brazing filler metal at the contact gap between the square hole and the heat pipe.

[0042] Repeat the process of loading the partitions and inner fins until all the inner fins are loaded.

[0043] Insert another outer fin into the top of the heat pipe;

[0044] The outer and inner fins are pressed together by a pressing mechanism;

[0045] After applying solder to the surfaces of the left and right stabilizing plates, the left and right stabilizing plates are fixed to both sides of the inner fins using the side stabilizing plate positioning mechanism.

[0046] The beneficial effects of this invention are:

[0047] (1) The present invention coats the outer fins and heat pipe surfaces of aluminum alloy material with nickel layer and then brazes them with the inner fins of copper material. This can prevent aluminum and copper atoms from directly contacting each other to form brittle compounds, and at the same time avoid corrosion problems caused by strong corrosive flux.

[0048] (2) The present invention uses needle-shaped lead-tin paste soft solder, which can be directly brazed in a resistance furnace without gas protection, without the need for professional gas-protected brazing furnace equipment, thereby greatly reducing production and processing costs.

[0049] (3) The present invention enhances the adhesion of the brazing filler metal at the weld by using various process methods such as flanging the square hole of the fin to moderately increase the contact area between the fin and the heat pipe, optimizing the assembly gap, strictly controlling the amount and uniformity of brazing filler metal feeding, thereby controlling the flow range of brazing filler metal, avoiding contamination of the working surface of the product and preventing adhesion to the fixture.

[0050] (4) This invention designs a stainless steel assembly and welding fixture tailored to the structural characteristics of the heat dissipation component. After the product is assembled and the brazing filler metal is loaded onto the fixture, the fixture is directly placed into the resistance furnace along with the product for brazing. This method can prevent the movement of the heat dissipation components after assembly from affecting the stability of the brazing filler metal, and can also control the thermal deformation during the high-temperature brazing process to the maximum extent, thus meeting the product design dimensional accuracy requirements. Through the complex and ingenious fixture structure design, all major components and fins of the heat dissipation component are fully positioned and clamped, and can be disassembled after welding without damaging the fixture and the product, thereby enabling the fixture to be reused multiple times.

[0051] (5) The welding method of the present invention can effectively solve the problems of poor weldability of aluminum and copper dissimilar metals in low-temperature lock cabinet heat dissipation components, compact and complex product structure, high dimensional accuracy, and large welding deformation, and produce qualified products. This method has the advantages of low processing cost, high processing accuracy, convenient operation, and stable and reliable quality. Attached Figure Description

[0052] Figure 1 This is a front view of the dual-head heat dissipation assembly disclosed in this invention;

[0053] Figure 2 This is a top view of the dual-head heat dissipation assembly disclosed in this invention;

[0054] Figure 3 This is a front view of the single-head heat dissipation assembly disclosed in this invention;

[0055] Figure 4 This is a top view of the single-head heat dissipation assembly disclosed in this invention;

[0056] Figure 5 This is a schematic diagram of the brazing structure at the joint between the heat pipe and the square hole of the inner fin, as disclosed in this invention.

[0057] Figure 6 This is a schematic flowchart of the low-temperature lock cabinet heat dissipation component assembly welding process disclosed in this invention;

[0058] Figure 7 This is a schematic diagram of the assembly and welding fixture structure for the dual-head heat dissipation component disclosed in this invention;

[0059] Figure 8 This is a schematic diagram of the assembly and welding fixture structure for a single-head heat dissipation component disclosed in this invention;

[0060] Figure 9 This is a schematic diagram of the structure of the base plate disclosed in this invention;

[0061] Figure 10 This is a schematic diagram of the structure of the pressure plate disclosed in this invention;

[0062] Figure 11 This is a schematic diagram of the side positioning plate disclosed in this invention;

[0063] Figure 12 This is a schematic diagram of the structure of the pressure strip disclosed in this invention;

[0064] Figure 13 This is a schematic diagram of the side pressure plate disclosed in this invention;

[0065] Figure 14 This is a schematic diagram of the structure of the central support disclosed in this invention;

[0066] Figure 15 This is a schematic diagram of the side support structure disclosed in this invention;

[0067] Figure 16 This is a schematic diagram of the positioning block disclosed in this invention;

[0068] Figure 17 This is a schematic diagram of the toothed top block disclosed in this invention;

[0069] Figure 18 This is a diagram illustrating the effect of using the dual-head heat dissipation component assembly and welding fixture disclosed in this invention.

[0070] Reference numerals: 1. Base plate; 101. Mounting groove; 102. Weight-reducing recessed groove; 2. Pressure plate; 201. U-shaped hole; 3. Handle; 4. Side positioning plate; 401. First weight-reducing cavity; 402. Fixing hole; 403. Pin hole; 404. Knurled screw mounting hole A; 5. Knurled screw; 6. Pin; 7. Pressure strip; 701. Through hole; 702. Rounded corner; 8. Side pressure plate; 801. Screw mounting hole; 802. Knurled screw mounting hole B; 803. Second weight-reducing cavity; 9. Shoulder-mounted hexagonal nut; 10. Screw; 11. Partition plate ; 12. Central support; 1201. Weight reduction groove; 1202. Three screw mounting holes B; 1203. Clearance groove; 1204. Clearance chamfer; 13. Side support; 14. Positioning block; 1401. Notch; 1402. Degassing hole; 15. Hexagonal head adjusting support; 16. Lower pressure block; 17. Toothed top block; 1701. Raised tooth; 18. Tightening screw; 19. Lifting ring; 20. Inner fin; 21. Outer fin; 22. Left side stabilizing plate; 23. Right side stabilizing plate; 24. Heat pipe; 25. Heat-conducting block; 26. Brazing filler metal coating seam. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in further detail below with reference to the accompanying drawings, but the embodiments of this invention are not limited thereto. It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0072] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0073] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0074] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0075] Example 1:

[0076] See Figures 1-4 The low-temperature lock cabinet heat dissipation assembly mainly includes several inner fins with uniform spacing, two outer fins located at the top and bottom of the inner fins, heat pipes passing through the inner and outer fins, and heat-conducting blocks. Preferably, to increase the strength of the inner fins, left-side and right-side stabilizing plates can be installed on both sides of the inner fins. In previous heat dissipation assemblies, the contact between the heat pipe and the fins was only mechanical, resulting in a large interface thermal resistance, which was not conducive to heat conduction and caused a large temperature difference at the junction of the heat pipe and the fins, reducing the heat dissipation performance of the heat pipe. Therefore, this embodiment proposes a welding process for assembling a low-temperature lock cabinet heat dissipation assembly to improve the heat dissipation performance of the heat pipe, specifically including the following steps:

[0077] Step 1: Plate the aluminum alloy outer fins and heat pipe surface with a nickel layer;

[0078] Step 2: Flanging is performed on all square holes and both sides of the inner fins made of copper.

[0079] Step 3: Place the outer fins at the bottom of the positioned heat pipe; when assembling the inner fins of the heat dissipation assembly, insert the square holes of the inner fins into the heat pipe layer by layer. After each layer of inner fins is installed, apply solder to the contact gap between the square holes of the inner fins and the heat pipe, and ensure that the spacing between each layer of inner fins is consistent; place another outer fin on top of the heat pipe.

[0080] Step 4: Fix the left and right stabilizing plates on both sides of the inner fin flange treatment. The contact surfaces of the left and right stabilizing plates with the inner fin are coated with brazing filler metal.

[0081] Step 5: Apply solder to the contact surface between the heat-conducting block and the heat pipe, and press them together firmly;

[0082] Step Six: After the heat dissipation components are assembled, brazing is performed to evenly immerse the brazing filler metal into the contact gap between the square holes of the inner fins and the heat pipe, so that the left and right stabilizing plates are fixed to both sides of the inner fins, and the heat-conducting blocks are welded together with the heat pipes.

[0083] In this embodiment, all parts of the product should be carefully cleaned and polished before welding. The outer fins and heat pipes of the heat dissipation assembly are made of aluminum alloy, and the inner fins are made of copper, preferably pure copper. First, the surface of the aluminum alloy outer fins and heat pipes is plated with a nickel layer before brazing them with the pure copper inner fins. This prevents the aluminum and copper atoms from directly contacting and forming brittle compounds, and also avoids corrosion problems caused by highly corrosive flux.

[0084] Specifically, the square holes of the outer fins at the bottom and top of the heat pipe are also coated with brazing filler metal at the gaps where they contact the heat pipe, and the outer fins are welded together during brazing.

[0085] See Figure 5 To increase the strength of the heat dissipation component, the square holes of the inner fins need to be flanged before inserting the heat pipe, thereby increasing the contact area between the heat pipe and the inner fins and improving the adhesion of the solder. Furthermore, flangering both sides of the inner fins increases the contact area between the left and right stabilizing plates and the sides of the inner fins. The contact surfaces of the left and right stabilizing plates with the inner fins are coated with solder and welded together during the welding process. Preferably, both the left and right stabilizing plates are made of copper.

[0086] Furthermore, the solder described in this embodiment is a needle-shaped lead-tin paste soft solder, which can be directly brazed in a resistance furnace without gas protection, eliminating the need for specialized gas-protected brazing furnace equipment and thus significantly reducing production and processing costs. This embodiment, by using lead-tin paste instead of conventional solder wire, achieves good wettability and excellent forming appearance while reducing flux residue.

[0087] When assembling heat dissipation components, it is necessary to strictly control the assembly gap, the amount of brazing filler metal, and the uniformity of the filler metal to enhance the adhesion of the brazing filler metal at the weld joint, thereby controlling the flow range of the brazing filler metal and preventing the brazing filler metal from flowing to the lower inner fins and causing contamination of the product's working surface.

[0088] This method effectively solves the problems of poor weldability between aluminum and copper in low-temperature lock cabinet heat dissipation components, complex and compact product structures, high dimensional accuracy, and large welding deformation, resulting in qualified products. This method offers advantages such as low processing cost, high processing accuracy, convenient operation, and stable and reliable quality.

[0089] Example 2:

[0090] See Figure 6 This embodiment discloses a welding process for a low-temperature lock cabinet heat dissipation assembly, including the following steps:

[0091] (1) Electroless nickel plating of heat pipe and outer fins → (2) Flanging of square holes in inner fins → (3) Assembly → (4) Cleaning → (5) Assembly → (6) Brazing filler metal loading → (7) Inspection → (8) Brazing → (9) Disassembly → (10) Cleaning and drying → (11) Inspection → (12) Performance test → (13) Packaging and warehousing.

[0092] Specifically, in this embodiment, the outer fins and heat pipe are made of aluminum alloy, and the inner fins are made of copper. In step (1), only the outer surface of the heat pipe is nickel-plated, while the entire surface of the outer fins is nickel-plated. The plating composition is nickel alloy. The appropriate plating thickness is determined through process experiments to prevent aluminum and copper atoms from directly contacting each other and forming brittle compounds, while avoiding corrosion problems caused by highly corrosive flux. After plating, the surface is heated and kept at that temperature for a certain period of time. The plating layer is checked and is not allowed to bubble or peel off.

[0093] Specifically, the flanging process of the square holes in the inner fins in step (2) is performed during the sheet metal processing of the inner fins to appropriately increase the contact area between the heat pipe and the fins and improve the adhesion of the brazing filler metal. Furthermore, in addition to all the square holes, the fins (including the inner and outer fins) are also flanged on both sides. The flanging direction is the same as the bending direction on both sides of the fins. In this embodiment, both the flanging and bending directions are downwards (see...). Figure 5 The flange height needs to be appropriate.

[0094] Step (3) assembly refers to collecting all the parts to be used.

[0095] Specifically, in step (4), each part of the heat dissipation assembly is cleaned with acetone and then air-dried. The welding surface of the heat-conducting block is polished with sandpaper.

[0096] Specifically, the two processes of assembly (5) and brazing filler metal loading (6) are carried out alternately, and the specific operation steps are as follows:

[0097] Place the heat pipe → Install the outer fins (located at the bottom of several inner fins) → Position the heat pipe through the square holes of the outer fins and then press it down → Apply solder to the contact surface of the heat-conducting block and then install it onto the heat pipe and press it down → Apply solder to the contact area between the outer fins and the heat pipe → Install the inner fins layer by layer (after each layer of fins is installed, a positioning partition must be installed to ensure the gap between the fins) → Apply solder (apply solder once after each layer of fins is installed, the application position is the gap between the square hole of the inner fin and the heat pipe) → Assemble another outer fin (located at the top of the heat pipe) → Press it down → Inspect → Grind the thickness of the last positioning partition to ensure the distance between the mounting holes of the bottom outer fin and the top outer fin → Apply solder to the gap at the contact area between the top outer fin and the heat pipe → Press all fins down → Apply solder to the surface of the side stabilizer plate → Assemble the side stabilizer plates.

[0098] Specifically, in step (6), the solder used for solder feeding is needle-shaped tin-lead paste. The height and width of the solder pile at the fin weld are uniform and controlled within a certain range to achieve optimal wettability. The amount and method of feeding are controlled to prevent the solder from overflowing during the welding process, so as to achieve a good forming appearance and reduce flux residue.

[0099] Specifically, in step (8), the brazing equipment uses a resistance furnace. The resistance furnace heats the material so that the brazing filler metal melts and is then immersed in the gap between the fins (including the outer fins and the inner fins) and the heat pipe.

[0100] Specifically, in step (9), after the brazing is completed, the assembly welding fixture is removed from the heat dissipation assembly, and then it is cleaned and dried. During the cleaning process, it is strictly forbidden to directly rinse the blades with a high-pressure water gun.

[0101] Specifically, both steps (5) assembly and (8) brazing utilize an "assembly and welding fixture". After the heat dissipation assembly is assembled and brazing filler is applied, it is not disassembled but directly brazed in the furnace along with the fixture. Therefore, this embodiment designs a low-temperature lock cabinet heat dissipation assembly and welding fixture, and designs a "double-head heat dissipation assembly and welding fixture" for two different shapes and specifications of heat dissipation assemblies: double-head heat dissipation assembly (5 liters) and single-head heat dissipation assembly (30 liters). Figure 7 ) and "Single-head heat dissipation component assembly welding fixture" Figure 8 ).

[0102] For details, see Figure 7The "dual-head heat dissipation component assembly and welding fixture" described in this embodiment includes: a base plate 1; a side support 13, mounted on the base plate 1, for supporting the outer fins 21 at the bottom of the heat dissipation component; a heat pipe fixing mechanism, detachably mounted on the base plate 1, for fixing the heat pipes 24 of the heat dissipation component on the base plate 1 and fixing the heat-conducting block 25 of the heat dissipation component on the heat pipes 24; a partition support frame, detachably and vertically mounted on the base plate 1; a partition 11, horizontally slidably mounted on the partition support frame at both ends, for supporting the inner fins 20 of each layer of the heat dissipation component, ensuring that the spacing of the inner fins 20 of each layer is consistent and does not deform; a pressing mechanism, horizontally mounted on the top of the partition support frame, for applying uniform downward pressure to the outer fins 21 at the top of the heat dissipation component; and a side stabilizing plate positioning mechanism, detachably mounted on the base plate 1, the side support 13, or the middle support 12 set on the base plate 1, for applying horizontal pressure to the left stabilizing plate 22 and the right stabilizing plate 22 of the heat dissipation component.

[0103] When assembling the inner fins 20 of the heat dissipation assembly using the assembly welding fixture, a partition plate 11 is placed after each layer of inner fins 20 is installed, and brazing filler metal is applied to the contact gap between the square hole of the inner fin 20 and the heat pipe 24. After the heat dissipation assembly is assembled, brazing is used to evenly adhere the brazing filler metal to the contact gap between the square hole of the inner fin 20 and the heat pipe 24, thereby fixing the left stabilizing plate 22 and the right stabilizing plate 23 to both sides of the inner fins, and welding the heat pipe 24 and the heat-conducting block 25 together.

[0104] Specifically, the heat pipe fixing mechanism includes a positioning block 14, a lower pressing block 16, a toothed top block 17, and a pressure plate 2; the toothed top block 17 is connected to tightening screws 18 at both ends and placed in the mounting groove 101 of the base plate 1, and is provided with a plurality of protruding teeth 1701 for placing the heat pipe 24; the lower pressing block 16 is installed on the base plate 1 and is used to press the heat-conducting block 25 of the heat dissipation assembly onto the base plate 1; the positioning block 14 is installed on the base plate 1 and is used to position the heat-conducting block 25; the pressure plate 2 is installed on the base plate 1 by screws and is used to fix the heat pipe 24 between the inner fins 20 and the heat-conducting block 25.

[0105] Specifically, the partition support frame is a screw 10, and the screw 10 has at least two sets, two in each set, symmetrically installed on the base plate 1; the partition 11 has through holes at both ends that cooperate with the screw 10; the pressing mechanism includes a pressure bar 7 and a shouldered hexagonal nut 9, the pressure bar 7 has through holes at both ends that cooperate with the screw 10, and the shouldered hexagonal nut 9 is installed at the top of each screw 10 to apply downward pressure to the pressure bar 7; the assembly welding fixture is made of stainless steel except for the partition 11, which is made of carbon steel.

[0106] Specifically, the side stabilizing plate positioning mechanism includes a side positioning plate 4 and a side pressure plate 8 arranged opposite to each other. The space between the side positioning plate 4, the side pressure plate 8, and the screw 10 is the assembly space for the inner fin 20 and the outer fin 21. Both the side positioning plate 4 and the side pressure plate 8 are provided with multiple knurled screws 5. The side positioning plate 4 is also provided with pins 6 that connect to the bottom and top of the outer fin 21 of the inner fin 20. By rotating the knurled screws 5 on the side positioning plate 4 and the side pressure plate 8, horizontal pressure is applied to the left stabilizing plate 22 and the right stabilizing plate 23 of the heat dissipation assembly.

[0107] The shape, structure, installation method, and function of each fixture component in the "single-head heat dissipation component assembly and welding fixture" are similar to those in the "double-head heat dissipation component assembly and welding fixture." The main differences are as follows: the "single-head heat dissipation component assembly and welding fixture" has three sets of screws 10, partitions 11, and pressure strips 7 due to its larger size, while the "double-head heat dissipation component assembly and welding fixture" only has two sets; the "single-head heat dissipation component assembly and welding fixture" lacks one central support 12 compared to the "double-head heat dissipation component assembly and welding fixture," and a weight-reducing cavity is opened in the middle of the base plate 1; the "double-head heat dissipation component assembly and welding fixture," being smaller in size, is carried using handles 3, while the "single-head heat dissipation component assembly and welding fixture," being larger in size, is lifted and carried using lifting rings 19.

[0108] Preferably, except for the partition plate 11, which is made of carbon steel, all other components of the assembly welding fixture are made of stainless steel to improve the fixture's resistance to deformation at high temperatures and to prevent the material from oxidizing and rusting at high temperatures. The partition plate 11 is made of carbon steel to facilitate clamping by the grinding machine during grinding.

[0109] For details, see Figure 7 The central support 12, side supports 13, and positioning blocks 14 are connected and fixed to the base plate 1 by cylindrical pins and screws (standard parts). The central support 12 is installed in the middle of the left end of the base plate 1, the two side supports 13 are symmetrically installed on both sides of the left end of the base plate 1, and the two positioning blocks 14 are symmetrically installed on both sides of the right end. The central support 12 and side supports 13 are used together to position the outer fins 21 at the bottom of the "dual-head heat dissipation assembly"; the positioning blocks 14 are used to position the heat-conducting blocks 25 of the "dual-head heat dissipation assembly".

[0110] Specifically, the pressure plate 2 and the side pressure plate 8 are connected to the base plate 1 by screws (standard parts). The pressure plate 2 is used to press the heat pipe 24 of the "dual-head heat dissipation assembly"; four knurled screws 5 are installed on the side pressure plate 8 to press the left stabilizing plate 22 of the "dual-head heat dissipation assembly".

[0111] Specifically, the side positioning plate 4 is mounted on the central support 12 by screws. The side positioning plate 4 is equipped with four knurled screws 5 for pressing the right stabilizing plate 23 of the "dual-head heat dissipation assembly", and also has eight pins 6 for positioning the mounting holes on the two outer fins 21 of the "dual-head heat dissipation assembly".

[0112] Specifically, the screws 10 are vertically mounted on the base plate 1 in two groups and pass through the through holes at both ends of the partitions 11 and the pressure strips 7. The number of partitions 11 is twice the number of the inner fins 20 of the "dual-head heat dissipation assembly". They are used to separate each layer of inner fins 20 and ensure that their spacing is uniform. The partitions 11 are located between the heat pipes 24 of the "dual-head heat dissipation assembly" and are as far away from all heat pipes 24 as possible to avoid them being stuck together by the solder. The pressure strips 7 are pressed on the outer fins 21 at the top of the "dual-head heat dissipation assembly". By tightening the pressure strips 7 with shouldered hexagonal nuts 9, all inner and outer fins 21 can be pressed together.

[0113] The toothed top block 17 is installed in two corresponding grooves in the base plate 1. The toothed top block 17 is equipped with tightening screws 18 at both ends. Rotating the tightening screws 18 can lift the toothed top block 17 upward, thereby pressing the back of the heat pipe 24 of the "dual-head heat dissipation assembly" so that the heat pipe 24 and the heat conduction block 25 are completely in contact.

[0114] A further proposed solution is:

[0115] See Figure 9 The base plate 1 is a rectangular steel plate with chamfered edges. Multiple threaded holes and pin holes are provided on the base plate 1 for mounting various fixture components. A weight-reducing recess 102 and a mounting groove 101 are provided on one side of the large chamfer, both with rounded edges. In addition to its weight-reducing function, the weight-reducing recess 102 also avoids the brazing area between the heat pipe 24 and the heat-conducting block 25, preventing brazing filler metal from flowing and sticking to the fixture base plate 1.

[0116] See Figure 10 The pressure plate 2 is a rectangular steel plate with two chamfers and U-shaped holes 201 symmetrically arranged at both ends along the length direction.

[0117] See Figure 11 The side positioning plate 4 is a "convex" shaped steel plate, symmetrically arranged with two first weight reduction cavities 401, three fixing holes 402, eight pin holes 403 and four knurled screw mounting holes A404.

[0118] See Figure 12 The pressure strip 7 is an "I" shaped steel strip with two round through holes 701 and rounded corners 702 symmetrically arranged at both ends along the length direction.

[0119] See Figure 13, the side pressing plate 8 is a "convex"-shaped bent steel plate, two screw mounting holes 801A are arranged at the bottom, and four knurled screw 5 mounting holes B and a second weight reduction cavity 803 are arranged on the side surface.

[0120] Specifically, the shape and structure of the partition plate 11 are the same as those of the pressing strip 7, but the material is different. The partition plate 11 is made of carbon steel, the thickness dimension is equal to the spacing between the inner fins 20 in the "double-head heat dissipation assembly", and the tolerance value is not more than 0.02 mm. The periphery of the partition plate 11 shall be blunted, and both end surfaces shall be ground to improve the smoothness, so as to prevent scratching the surface of the workpiece during dragging. Carbon steel is selected as the material instead of heat-resistant stainless steel like other parts, mainly considering that stainless steel cannot be magnetically adsorbed on the workbench during grinding, which is inconvenient for processing.

[0121] See Figure 14 , a weight reduction groove 1201 is arranged in the middle of the middle support 12, a threaded through hole and a positioning pin hole are arranged at the bottom for fixing the middle support 12 on the bottom plate 1, three screw mounting holes 801B are arranged on the front surface for mounting the side positioning plate 4, and an avoidance groove 1203 and an avoidance chamfer 1204 are symmetrically arranged at both ends to avoid interference with the root fillet 702 of the outer fin 21 at the bottom.

[0122] See Figure 15 , the side support 13 is L-shaped in shape, a chamfer is arranged at one end to avoid interference with the root fillet 702 of the outer fin 21 at the bottom, two blind holes are arranged at the bottom for mounting cylindrical pins, and four through holes are arranged for mounting screws so as to fix the side support 13 on the bottom plate 1.

[0123] See Figure 16 , one end of the positioning block 14 is provided with a notch 1401 for positioning the heat conduction block 25 of the "double-head radiator assembly", and an air elimination hole 1402 is arranged at the root of the notch 1401. Two through holes for mounting cylindrical pins and one through hole for mounting screws are arranged on the surface so as to fix the positioning block 14 on the bottom plate 1.

[0124] See Figure 17 , four convex teeth 1701 are symmetrically arranged in the middle of the tooth-shaped top block 17, and two threaded holes are arranged at both ends for mounting the tightening screws 18. The tooth-shaped design is to prevent the top block from contacting the gap between the top block and the heat pipe 24, so as to avoid that the brazing filler metal leaked from the gap adheres to the top block.

[0125] In combination with Figure 7 , Figure 18 as shown, the using method and steps of the assembly welding fixture for the "double-head heat dissipation assembly" of the present invention are as follows:

[0126] 1) Clean all fixture elements with gasoline and then air dry naturally.

[0127] 2) Place the heat pipe 24 of the heat sink assembly onto the base plate 1, with the right end roughly flush with the base plate 1.

[0128] 3) Pass the square holes of the two outer fins 21 of the radiator assembly through the two heat pipes 24 (bending downwards) and move them downwards until the bottom surface of the outer fins 21 contacts and adheres to the upper surface of the middle support 12 and the side support 13, and the bent edge of the outer fins 21 contacts and adheres to the side of the side support 13.

[0129] 4) After applying solder to the contact surface of the heat-conducting block 25 of the heat sink assembly, install it on the heat pipe 24, and position it using the stepped positioning surface of the positioning block 14, then press the two sides of the heat-conducting block 25 with the pressure plate 2.

[0130] 5) Press the heat pipe 24 tightly with the pressure plate 2.

[0131] 6) Pass a set of partitions 11 (two as a set) through the two screws 10 respectively, and slide them down to fit against the upper surface of the outer fin 21.

[0132] 7) Insert one set of inner fins 20 (two in a set) of the radiator assembly through the square hole (flanged downward) into the heat pipe 24 and into the clamp, and slide them down to fit against the partition plate 11.

[0133] 8) Apply brazing filler metal to the gaps where the four square holes of the inner fin 20 contact the heat pipe 24.

[0134] 9) Repeat steps 7) to 8) until all inner fins 20 are installed.

[0135] 10) Install the last set of partitions 11.

[0136] 11) Insert the two outer fins 21 of the radiator assembly into the heat pipe 24 through the square hole.

[0137] 12) Use two pressure strips 7 to pass through the screw 10 respectively and use the shouldered hexagonal nut 9 to press the outer fin 21 tightly.

[0138] 13) Fix the side positioning plate 4 to the middle support 12 with screws.

[0139] 14) Install eight pins 6 and insert them into the side mounting holes of the top and bottom outer fins 21. If the center of the hole in the top outer fin 21 is higher than the center of the pin 6, remove the last set of partition plates 11 to adjust the thickness. If the center of the hole in the top outer fin 21 is lower than the center of the pin 6, place thin stainless steel sheets on the partition plates 11 to adjust the height. If the height difference is large, remove more partition plates 11 to adjust the thickness or raise them to distribute the thickness difference evenly across several layers to avoid excessive deviation in the spacing of a single layer.

[0140] 15) After applying solder to the contact surfaces of the left-side stabilizing plate 22, right-side stabilizing plate 23 and inner fin 20 of the heat sink assembly, install them into the left and right sides of the heat sink assembly and tighten them with knurled screws 5.

[0141] 16) Rotate the tightening screw 18 to make the teeth of the toothed top block 17 press against the back of the heat pipe 24, eliminating the gap between the heat pipe 24 and the heat-conducting block 25.

[0142] 17) Place the heat dissipation assembly into the resistance furnace for brazing, along with the "dual-head heat dissipation assembly" assembly welding fixture.

[0143] 18) After the brazing is completed and cooled, remove the fixture along with the heat dissipation components from the resistance furnace.

[0144] 19) After removing the pressure strip 7 and the shouldered hexagonal nut 9, remove all the screws 10.

[0145] 20) Remove pressure plate 2, pressure plate 2, side positioning plate 4, and pin 6.

[0146] 21) Clamp one end of partition 11 with wire cutters and pull all partitions 11 out one by one from the side.

[0147] The low-temperature lock cabinet heat dissipation assembly welding method of this embodiment can be used to prepare the low-temperature lock cabinet heat dissipation assembly. The heat dissipation assembly includes a heat-conducting block 25, a heat pipe 24, inner fins 20, outer fins 21, a left stabilizing plate 22, and a right stabilizing plate 23. Two outer fins 21 are disposed on the top and bottom of several equally spaced inner fins 20. The heat pipe 24 passes through square holes provided on the inner fins 20 and outer fins 21. The heat-conducting block 25 is located at one end of the heat pipe 24. The left stabilizing plate 22 and the right stabilizing plate 23 are located on both sides of several inner fins 20.

[0148] Specifically, the heat dissipation components can be fabricated using the aforementioned "single-head heat dissipation component assembly and welding fixture" and "double-head heat dissipation component assembly and welding fixture" to produce single-head heat dissipation components (such as...). Figures 3-4 ) and dual-head heat dissipation components (such as Figures 1-2 The dual-head heat dissipation assembly includes two heat dissipation heads, each consisting of an inner fin 20, an outer fin 21, a left stabilizing plate 22, and a right stabilizing plate 23; each heat dissipation head is welded together with two heat pipes 24. The single-head heat dissipation assembly has only one heat dissipation head, which has a similar structure to the dual-head heat dissipation assembly, except that four heat pipes 24 are welded together with the heat dissipation head.

[0149] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A welding fixture for assembling heat dissipation components of a low-temperature lock cabinet, characterized in that, include: Base plate; Side support, mounted on the base plate, for the outer fins at the bottom of the heat pipe; A heat pipe fixing mechanism is detachably mounted on the base plate to fix the heat pipe of the heat dissipation component on the base plate and to fix the heat-conducting block of the heat dissipation component on the heat pipe. A partition support frame, which is detachable and vertically mounted on the base plate; The partition plate is horizontally slidably mounted on the partition plate support frame at both ends to support the inner fins of each layer of the heat dissipation assembly, so that the spacing of the inner fins of each layer is consistent and does not deform. The downward pressure mechanism is horizontally installed on the top of the partition support frame and is used to apply uniform downward pressure to the outer fins at the top of the heat pipe. The side stabilizer positioning mechanism is detachably mounted on the base plate, side support, or middle support set on the base plate, and is used to apply horizontal pressure to the left and right stabilizers of the heat dissipation assembly. When assembling the inner fins of the heat dissipation assembly using the assembly welding fixture, a partition is placed after each layer of inner fins is installed, and brazing filler metal is applied to the contact gap between the square hole of the inner fin and the heat pipe. After the heat dissipation assembly is assembled, brazing is used to make the brazing filler metal evenly adhere to the contact gap between the square hole of the inner fin and the heat pipe, so that the left and right stabilizing plates are welded to both sides of the inner fins, and the heat-conducting block is welded to the heat pipe. The heat pipe fixing mechanism includes a positioning block, a lower pressing block, a toothed top block, and a pressure plate. The toothed top block, with tightening screws connected to both ends, is placed in the mounting groove of the base plate and has multiple protruding teeth for placing the heat pipe. The positioning block is installed on the base plate to position the heat-conducting block. The lower pressing block is installed on the base plate to press the heat-conducting block of the heat dissipation assembly onto the base plate, with the heat-conducting block positioned above the toothed top block and the heat pipe. Rotating the tightening screws raises the toothed top block and presses the heat pipe against the heat-conducting block. The pressure plate is installed on the base plate with screws to fix the heat pipe between the inner fins and the heat-conducting block.

2. The low-temperature lock cabinet heat dissipation assembly welding fixture according to claim 1, characterized in that, The partition support frame is a screw rod, and the screw rod includes at least two sets, two in each set, symmetrically installed on the base plate; the partition has through holes at both ends that mate with the screw rod; the pressing mechanism includes a pressure bar and a shouldered hexagonal nut, the pressure bar has through holes at both ends that mate with the screw rod, and the shouldered hexagonal nut is installed on the top of each screw rod to apply downward pressure to the pressure bar; the assembly welding fixture is made of stainless steel except for the partition, which is made of carbon steel.

3. The low-temperature lock cabinet heat dissipation assembly welding fixture according to claim 1, characterized in that, The side stabilizing plate positioning mechanism includes a side positioning plate and a side pressure plate arranged opposite each other. The side positioning plate and the side pressure plate are located on both sides of the partition support frame. The middle part of the side positioning plate, the side pressure plate, and the partition support frame is the area for assembling the inner fins. Both the side positioning plate and the side pressure plate are provided with multiple knurled screws. The side positioning plate is also provided with pins that connect to the outer fins at the bottom and top of the heat pipe. By rotating the knurled screws on the side positioning plate and the side pressure plate, horizontal pressure is applied to the left and right stabilizing plates of the heat dissipation assembly.

4. A method for welding and processing heat dissipation components for a low-temperature lock cabinet, characterized in that, include: The outer fins and heat pipes made of aluminum alloy are plated with a nickel layer. The inner fins made of copper are flanged at all square holes and on both sides. Cleaning: Clean the outer fins, heat pipes, and inner fins; Assembly: Using the assembly welding fixture described in any one of claims 1-3, the outer fins, heat pipes, heat-conducting blocks, inner fins, left-side stabilizing plate, and right-side stabilizing plate are assembled to form a heat dissipation assembly; Brazing involves heating the heat pipe in an electric resistance furnace to evenly adhere the brazing filler metal to the contact gap between the square hole of the inner fin and the heat pipe, thereby fixing the left and right stabilizing plates to both sides of the inner fin and fixing the heat-conducting block to the heat pipe. Disassemble and remove the assembly welding fixture from the heat dissipation assembly; Cleaning and drying; Inspection and performance testing.

5. The method for welding and processing the heat dissipation assembly of a low-temperature lock cabinet according to claim 4, characterized in that, The assembly process includes: The heat pipe is fixed to the base plate using a heat pipe fixing mechanism; Pass the square holes of the outer fins through the heat pipe and place them on the side support; After applying solder to the contact surface of the heat-conducting block, install it onto the heat pipe and press the heat-conducting block tightly against the heat pipe. Insert one layer of partition into the partition support frame; Pass the heat pipe through the square hole of the inner fin, and apply brazing filler metal at the contact gap between the square hole and the heat pipe. Repeat the process of loading the partitions and inner fins until all the inner fins are loaded. Insert another outer fin into the top of the heat pipe; The outer and inner fins are pressed together by a pressing mechanism; After applying solder to the surfaces of the left and right stabilizing plates, the left and right stabilizing plates are fixed to both sides of the inner fins using the side stabilizing plate positioning mechanism.

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