Welding positioning jig of heat dissipation module

Abstract

The utility model discloses a welding and positioning jig for a heat dissipation module, which comprises a positioning base provided with a placing position matched with a heat absorption sheet; the positioning base is provided with a welding limiting block capable of axially sliding at the condensation end of the heat conduction pipe, and the welding limiting block is provided with a sliding block hole; a welding pressing block and a pin shaft matched with the sliding block hole are arranged at the bottom of the upper cover, when the upper cover covers the heat dissipation module, the welding pressing block tightly presses the heat dissipation module, and the pin shaft is inserted into the sliding block hole to fix the welding limiting block. The structure is adjusted through the welding limiting block so as to adapt to heat conduction pipes of different sizes, and errors existing in the manufacturing and assembling process of the heat conduction pipes can be dynamically compensated; meanwhile, the welding limiting block allows the heat conduction pipe to axially and slightly displace after being heated in the welding process, and welding thermal stress accumulation is avoided. A receding groove is formed in the sliding part of the main body, so that the welding limiting block does not interfere with the mounting part of the elastic piece in the process of restraining the axial displacement of the heat conduction pipe, and elastic close contact between the heat conduction pipe and the heat dissipation fins is achieved.

Description

Technical Field

[0001] This utility model relates to the field of welding positioning technology for heat dissipation modules, and in particular to a welding positioning fixture for heat dissipation modules. Background Technology

[0002] With the improvement of electronic device performance, its heat generation has increased significantly. The welding positioning accuracy of the heat dissipation module directly affects the heat dissipation efficiency and long-term reliability. The positioning fixtures used in traditional heat dissipation module welding usually use a fixed limiting method to constrain the ends of the heat conduction pipes. This rigid positioning structure has the following technical defects in practical applications: 1. It cannot adapt to heat conduction pipes of different sizes, especially when there are errors in the manufacturing and assembly process. It lacks dynamic adjustment capability and has poor tolerance adaptability. For example, when multiple heat conduction pipes are arranged side by side, the thickness tolerance caused by the roll forming process will accumulate and amplify. The gap between the fixed limiting block and the end of the heat conduction pipe cannot be automatically compensated, resulting in uneven contact pressure between the heat conduction pipe and the heat dissipation fins after positioning, and even local suspension, which seriously affects the heat conduction efficiency. 2. The heat conduction pipe will expand due to heat during the high-temperature welding process. The fixed limiting structure at the end of the heat conduction pipe will hinder its free expansion, and the axial stress cannot be released, causing the positioning fixture or heat dissipation module to undergo plastic deformation during the welding process.

[0003] Furthermore, to ensure a constant contact pressure between the heat pipe and the corresponding heat dissipation fins during both welding and operation, a spring clip is typically installed at the bottom of the heat dissipation fins to improve contact reliability. The spring clip's mounting part needs to be fixed to the positioning base. When the spring clip is positioned at the end of the heat pipe, traditional fixtures face a dilemma:

[0004] 1) If a fixed limiting structure is set, it will cause spatial interference with the spring mounting part, resulting in the spring not being able to be installed normally;

[0005] 2) Without a limiting structure: The heat pipe is unrestrained in the axial direction and is prone to movement during assembly due to operational vibration or rolling tolerance. Especially for multiple parallel heat pipes, the accumulated gaps can cause the welding block to misalign with the heat pipe when the top cover is pressed, thus damaging the surface of the heat pipe. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a welding positioning fixture for a heat dissipation module, comprising: a positioning base having a placement position adapted to the heat absorption sheet; the positioning base having an axially sliding welding limiting block at the condensation end of the heat pipe, the welding limiting block having a slider hole; and an upper cover having a welding pressure block and a pin cooperating with the slider hole at its bottom. When the upper cover is closed, the welding pressure block presses against the heat dissipation module, and the pin is inserted into the slider hole to fix the welding limiting block.

[0007] A further technical solution is as follows: the welding limiting block includes a main sliding part; the main sliding part is provided with a stroke groove extending along the axial direction; a limiting stop pin for limiting the sliding stroke passes through the stroke groove.

[0008] A further technical solution is that the stroke groove is provided in two sets, and the two sets of stroke grooves are distributed on both radial sides of the main sliding part.

[0009] The further technical solution is as follows: the heat dissipation module includes a first fin group and a second fin group. The evaporation end in the middle of the heat pipe is in contact with the heat source through a heat absorption plate. The condensation ends at both ends of the heat pipe are respectively connected to the first fin group and the second fin group. The positioning base is provided with axially sliding welded limiting blocks at both ends of the condensation end of the heat pipe.

[0010] A further technical solution is that the positioning base is provided with a fin receiving groove at the condensation end of the heat pipe to accommodate each heat dissipation fin of the heat dissipation module, and the depth of the fin receiving groove is less than the height of each heat dissipation fin.

[0011] A further technical solution is that: the fin receiving groove is provided with a clearance groove on the side along the radial direction of the heat pipe, and the clearance groove is connected to the fin receiving groove.

[0012] A further technical solution is that a radial limiting block is provided on one radial side of the fin receiving groove, and the other side forms a matching limiting structure with the radial limiting block through the fin protrusions of each heat dissipation fin, so as to constrain the radial displacement of the heat pipe.

[0013] A further technical solution is as follows: a spring is provided in the fin receiving groove. The spring includes a base connected to the bottom of each heat dissipation fin and a mounting part connected to the base through an extension. The mounting part is fixed on the positioning base. The spring's elastic force enables each heat dissipation fin to fit tightly with the heat pipe.

[0014] A further technical solution is as follows: a spring plate mounting position for fixing the installation part is provided on the positioning base below the end of the heat conduction pipe, and a clearance groove is provided on the main body sliding part. The clearance groove provides clearance space for the spring plate mounting position during the axial movement of the main body sliding part.

[0015] A further technical solution is as follows: multiple heat pipes are arranged in parallel in a side-by-side bonding manner, wherein the ends of the heat pipes without spring plate mounting positions are provided with fixed limiting blocks, and the fixed limiting blocks abut against the ends of the corresponding heat pipes to prevent axial displacement of the heat pipes.

[0016] The beneficial technical effects of this utility model are as follows: The welded limiting block can be adjusted to accommodate heat pipes of different sizes, and can dynamically compensate for errors that may occur during the manufacturing and assembly of the heat pipes. Simultaneously, the welded limiting block allows for slight axial displacement of the heat pipe when heated, preventing thermal stress accumulation and bending deformation, which would prevent tight contact with the heat dissipation fins. Furthermore, the clearance groove on the sliding part of the main body ensures that the welded limiting block does not interfere with the mounting part of the spring plate during the constraint of the heat pipe's axial displacement, achieving elastic and tight contact between the heat pipe and the heat dissipation fins. The overall structure enables precise positioning, adaptive thermal expansion, and control of the contact pressure between the heat pipe and the heat dissipation fins during the welding process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the welding positioning of the heat dissipation module of this utility model;

[0019] Figure 3 This is a schematic diagram of the bottom structure of the positioning base and the top cover of this utility model;

[0020] Figure 4 This is a schematic diagram of the contour positioning structure for the various components of the heat dissipation module of this utility model to be adapted to each other.

[0021] Figure 5 This is a schematic diagram of the specific structure of the mounting position of this utility model;

[0022] Figure 6 This is a utility model Figure 4 Enlarged view of a portion;

[0023] Wherein: 100, heat dissipation module; 101, first fin group; 102, second fin group; 103, heat pipe; 200, heat absorption plate; 300, fin protrusion;

[0024] 1. Positioning base; 2. Top cover; 3. Welding pressure block; 4. Placement position; 41. Limiting protrusion; 42. First positioning pin; 5. Mounting position; 51. Contour limiting groove; 52. Radial limiting block; 6. Fin receiving groove; 61. Clearance groove; 7. Axial limiting mechanism; 71. Fixed limiting block; 72. Welding limiting block; 721. Main body sliding part; 722. Clearance groove; 723. Stroke groove; 724. Slider hole; 725. Limiting stop pin; 8. Ventilation hole; 9. Spring piece; 91. Base; 92. Mounting part; 93. Extension part. Detailed Implementation

[0025] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0026] like Figures 1 to 3 As shown, the welding positioning fixture for a heat dissipation module according to this utility model includes a positioning base 1 and an upper cover 2 that covers the positioning base 1. The positioning base 1 is provided with a contour positioning structure for assembling the heat dissipation module 100, so that the components of the heat dissipation module 100 are placed on the corresponding contour positioning structure in a preset order, so that the components are aligned and connected. The bottom of the upper cover 2 is provided with a plurality of welding pressure blocks 3. When the upper cover 2 is closed on the positioning base 1, the welding pressure blocks 3 press against the assembled heat dissipation module 100 to achieve the clamping and positioning of the components.

[0027] In this embodiment, the heat dissipation module 100 includes a first fin group 101, a second fin group 102, and a plurality of heat pipes 103. The first fin group 101 and the second fin group 102 are each formed by stacking a plurality of heat dissipation fins in a horizontal direction. The heat pipes 103 are flat and include an evaporation end located in the middle and a condensation end extending to both sides along the evaporation end. The evaporation end is in contact with the heat source through a heat absorption plate 200, and the condensation ends on both sides are connected to the surfaces of the first fin group 101 and the second fin group 102, respectively.

[0028] Specifically, such as Figure 4 The positioning base 1 is provided with a placement position 4 adapted to the heat absorption sheet 200 and an installation position 5 adapted to each heat conduction pipe 103. The placement position 4 is a placement space formed by a number of limiting protrusions 41. A number of first positioning pins 42 are provided on the placement position 4. Each first positioning pin 42 corresponds precisely to the positioning hole preset on the heat absorption sheet 200 to ensure the alignment accuracy during assembly.

[0029] In this embodiment, the multiple heat pipes 103 are arranged in parallel in a side-by-side bonding manner, such as... Figure 5 The mounting position 5 includes a contoured limiting groove 51 formed on the heat absorber 200. The shape of each contoured limiting groove 51 is adapted to the cross-sectional profile of the corresponding heat pipe 103. Radial limiting blocks 52 are provided on both sides of the contoured limiting groove 51 along the axial direction of each heat pipe 103. The radial limiting blocks 52 and the contoured limiting groove 51 are used to constrain the displacement of the heat pipe 103 in the radial direction. Axial limiting mechanisms 7 are also provided at both ends of each heat pipe 103 in the axial direction to prevent the heat pipe 103 from displacing in the axial direction.

[0030] The positioning base 1 has fin receiving grooves 6 at the condensation ends on both sides of the heat pipe 103, which are used to accommodate the first fin group 101 and the second fin group 102 respectively. The depth of the fin receiving grooves 6 on both sides is less than the height of the first fin group 101 and the second fin group 102, so as to reduce the contact area between each heat dissipation fin and the groove wall of the fin receiving groove 6, thereby reducing assembly stress and friction effects.

[0031] Furthermore, the fin receiving groove 6 is provided with a clearance groove 61 on the side along the radial direction of the heat pipe 103. The clearance groove 61 is connected to the fin receiving groove 6. The width of the clearance groove 61 is optimized to further reduce the contact area with each heat dissipation fin while ensuring the effective limitation of the fin receiving groove 6, so as to reduce thermal expansion constraints and improve the heat dissipation airflow distribution.

[0032] In this embodiment, the condensation end of each heat pipe 103 is connected to the upper surface of the first fin group 101 and the second fin group 102, respectively. Specifically, a radial limiting block 52 is provided on one side of the fin receiving groove 6 along the radial direction of each heat pipe 103, and fin protrusions 300 extending in the height direction are provided on the upper surface of the first fin group 101 and the side opposite to the radial limiting block 52. The radial limiting block 52 and the fin protrusions 300 on one side of the fin receiving groove 6 form a matching limiting structure to constrain the radial displacement of the condensation end of each heat pipe 103. At the same time, the fin protrusions 300 can reduce the amount of radial limiting blocks 52 used in the positioning base 1 and reduce the overall weight.

[0033] The positioning base 1 has several ventilation holes 8, especially at the bottom of the fin receiving groove 6, which allows hot air to flow into the assembled first fin group 101 and second fin group 102, so that the heat dissipation module 100 is heated evenly, improving the welding quality and making the welding more reliable.

[0034] The welding pressure block 3 provided on the upper cover 2 has a contoured protrusion structure and is continuously distributed, and is adapted to the axial extension direction of each heat pipe 103, thereby achieving uniform axial pressing and positioning of each heat pipe 103.

[0035] In this embodiment, when positioning the heat dissipation module 100, in order to ensure that the heat pipe is in elastic and tight contact with the first fin group 101 and the second fin group 102, a spring piece 9 is provided in the fin receiving groove 6. The spring piece 9 includes a base 91, a mounting part 92 and an extension part 93 for connecting the base 91 and the mounting part 92. The base 91 is connected to the bottom of each heat dissipation fin, and the mounting part 92 is fixed on the positioning base 1. The elastic force of the spring piece 9 achieves tight contact between each heat dissipation fin and the heat pipe 103.

[0036] Specifically, the positioning base 1 has a spring plate mounting position for fixing the mounting part 92 located below the end of one of its heat conduction pipes 103. The mounting part 92 has a mounting hole that cooperates with the second positioning pin on the spring plate mounting position.

[0037] After the heat pipes 103 are installed, the heat sink fins are subjected to an upward clamping force under the rebound force of the spring contact 9, ensuring that the upper surface of the heat sink fins remains fully in contact with the bottom surface of the heat pipes 103, thus improving the contact reliability of the heat dissipation module 100. Furthermore, the flexible deformation of the spring contact 9 can compensate for the differences in thermal expansion and contraction between the heat sink fins and the heat pipes 103, reducing the risk of overall structural deformation. Simultaneously, during device operation (such as in laptops and servers), vibration may cause micro-displacement between the heat sink fins and the heat pipes; long-term wear will reduce heat dissipation performance. The elasticity of the spring contact 9 can absorb some of the vibration energy, reducing relative displacement and achieving dynamic protection for the product.

[0038] In this embodiment, the axial limiting mechanism 7 includes a fixed limiting block 71 and a welding limiting block 72. The fixed limiting block 71 is fixed to the end of the heat pipe 103 without the spring plate mounting position. The welding limiting block 72 can slide along the axial direction and is correspondingly arranged with the spring plate mounting position. The mounting part 92 of the spring plate 9 is fixed on the spring plate mounting position.

[0039] The welding limiting block 72 includes a main sliding part 721, which is provided with a clearance groove 722, a travel groove 723, and a slider hole 724. The clearance groove 722 is used to avoid the mounting part 92 of the spring piece 9 during sliding, thus preventing sliding interference. The travel groove 723 extends in the same direction as the heat pipe 103. In this embodiment, there are two sets of travel grooves 723, which are located on both sides of the main sliding part 721 in the radial direction. A limiting pin 725, which is fixedly connected to the positioning base 1, passes through the travel groove 723. The limiting pin 725 is used to limit the sliding stroke of the main sliding part 721. When the main sliding part 721 slides to the limit position in the direction of the heat pipe 103, the end face of the main sliding part 721 abuts against the end of the heat pipe 103, and the limiting stop pin 725 is located at the end of the stroke groove 723 away from the heat pipe 103. At this time, the upper cover 2 is closed, and the pin of the upper cover 2 is inserted into the slider hole 724 to prevent the main sliding part 721 from retracting and to complete the final fixation of the heat dissipation module 100.

[0040] The axial movement of the main sliding part 721 is used to adapt to heat pipes 103 of different sizes, compensate for manufacturing and assembly tolerances, and achieve dynamic adjustment and tolerance compensation.

[0041] During assembly, the solder sheet is first placed in the welding area of ​​the corresponding component, and then each component is installed on the positioning base 1 in sequence. After the cover 2 is placed on the box, the whole assembly is placed in the reflow oven. When the heat pipe 103 is heated and elongated, the welding limit block 72 can be slightly displaced along the axial direction during thermal expansion, which can relieve the axial stress caused by thermal expansion and avoid structural deformation or contact pressure imbalance.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A welding positioning fixture for a heat dissipation module, characterized in that: include: The positioning base (1) has a placement position (4) adapted to the heat absorber (200); the positioning base (1) has an axially sliding welding limit block (72) at the condensation end of the heat pipe (103), and the welding limit block (72) has a slider hole (724). The top cover (2) has a welding pressure block (3) and a pin that cooperates with the slider hole (724) at its bottom. When the top cover (2) is closed, the welding pressure block (3) presses the heat dissipation module (100) and the pin is inserted into the slider hole (724) to fix the welding limit block (72).

2. The welding positioning fixture for a heat dissipation module according to claim 1, characterized in that: The welding limiting block (72) includes a main sliding part (721); the main sliding part (721) is provided with a stroke groove (723) extending along the axial direction; a limiting stop pin (725) for limiting the sliding stroke passes through the stroke groove (723).

3. The welding positioning fixture for a heat dissipation module according to claim 2, characterized in that: The stroke groove (723) is provided in two sets, and the two sets of stroke grooves (723) are distributed on both sides of the main sliding part (721).

4. The welding positioning fixture for a heat dissipation module according to claim 1, characterized in that: The heat dissipation module (100) includes a first fin group (101) and a second fin group (102). The evaporation end of the heat pipe (103) in the middle is in contact with the heat source through the heat absorption plate (200). The condensation ends at both ends of the heat pipe (103) are respectively connected to the first fin group (101) and the second fin group (102). The positioning base (1) is provided with axially sliding welded limiting blocks (72) at both ends of the condensation ends of the heat pipe (103).

5. The welding positioning fixture for a heat dissipation module according to claim 2, characterized in that: The positioning base (1) has a fin receiving groove (6) at the condensation end of the heat pipe (103) to accommodate each heat dissipation fin of the heat dissipation module (100). The depth of the fin receiving groove (6) is less than the height of each heat dissipation fin.

6. The welding positioning fixture for a heat dissipation module according to claim 5, characterized in that: The fin receiving groove (6) has a clearance groove (61) on the side along the radial direction of the heat pipe (103), and the clearance groove (61) is connected to the fin receiving groove (6).

7. The welding positioning fixture for a heat dissipation module according to claim 5, characterized in that: The fin receiving groove (6) has a radial limiting block (52) on one radial side, and the other side forms a matching limiting structure with the radial limiting block (52) through the fin protrusions (300) of each heat dissipation fin, so as to constrain the radial displacement of the heat pipe (103).

8. The welding positioning fixture for a heat dissipation module according to claim 5, characterized in that: The fin receiving groove (6) is provided with a spring piece (9). The spring piece (9) includes a base (91) connected to the bottom of each heat dissipation fin and a mounting part (92) connected to the base (91) through an extension part (93). The mounting part (92) is fixed on the positioning base (1). The spring piece (9) achieves a tight fit between each heat dissipation fin and the heat pipe (103).

9. A welding positioning fixture for a heat dissipation module according to claim 8, characterized in that: The positioning base (1) is provided with a spring plate placement position for fixing the mounting part (92) below the end of the heat pipe (103). The main body sliding part (721) is provided with a clearance groove (722). The clearance groove (722) provides clearance space for the spring plate placement position during the axial movement of the main body sliding part (721).

10. A welding positioning fixture for a heat dissipation module according to claim 9, characterized in that: Multiple heat pipes (103) are arranged in parallel in a side-by-side bonding manner. The end of the heat pipe (103) without the spring plate mounting position is provided with a fixed limiting block (71). The fixed limiting block (71) abuts against the end of the corresponding heat pipe (103) to prevent the heat pipe (103) from axial displacement.

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