A welding device for improving reliability of a thermoelectric refrigerator

Abstract

The application discloses a kind of welding devices for improving the reliability of thermoelectric refrigerator, including heat-conducting bottom plate, the heat-conducting bottom plate is provided with several positioning columns, the positioning column is arranged according to the rim of thermoelectric refrigerator, the heat-conducting bottom plate is connected with movable guide rod, the movable guide rod is slidably connected with limit block, the movable guide rod is provided with locking spring that abuts limit block, the limit block includes the limit step that is protrudingly arranged close to the side of positioning column, thermoelectric refrigerator includes upper substrate and lower substrate, the limit step only abuts lower substrate, there is excess clearance between the upper substrate and limit block.The application provides a kind of welding devices for improving the reliability of thermoelectric refrigerator, can improve the reliability in welding process, the limitation and welding quality for upper and lower substrate in welding process are considered, avoid the obvious deviation of upper and lower substrate after welding is completed, guarantee the connection reliability of welding place.

Description

Technical Field

[0001] This invention relates to the field of thermoelectric cooler technology, and in particular to a welding apparatus for improving the reliability of thermoelectric coolers. Background Technology

[0002] For example, announcement number "CN216680930U" discloses "An Automatic Alignment Device for Refrigerator Welding Based on Machine Vision," which includes a base. A second linear motor is embedded inside the base. A fixed bracket is located on top of the second linear motor, and the bottom of the fixed bracket is connected to the slider of the second linear motor by screws. A second limiting groove is located on the inner bottom surface of the fixed bracket, a first cylinder is located on top of the second limiting groove, and a vision analysis device is located on the side of the second limiting groove. A data analyzer is located on the top edge of the base, and a vision acquisition camera is located inside the data analyzer. However, in practical applications, during the welding of thermoelectric coolers, the solder melts, causing a certain amount of displacement between the upper substrate and the lower substrate. This device cannot provide limiting constraints during the welding process. Even when applied to the welding process, while it provides a limiting effect on the upper substrate, it also hinders the settling movement of the upper substrate after the solder melts, resulting in insufficient connection strength at the weld. Summary of the Invention

[0003] In view of the problem mentioned in the background art that the limiting tooling cannot simultaneously solve the problems of limiting and self-sinking during the welding of the upper substrate, the present invention provides a welding device for improving the reliability of thermoelectric coolers. It can improve the reliability of the welding process, and take into account both the limiting of the upper and lower substrates and the welding quality during the welding process, so as to avoid significant displacement of the upper and lower substrates after welding and ensure the connection reliability of the weld.

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

[0005] A welding apparatus for improving the reliability of a thermoelectric cooler includes a heat-conducting base plate with a plurality of positioning posts arranged along the edge of the thermoelectric cooler. A movable guide rod is connected to the heat-conducting base plate, and a limiting block is slidably connected to the movable guide rod. A locking spring abutting against the limiting block is provided on the movable guide rod. The limiting block includes a limiting step protruding from the side near the positioning posts. The thermoelectric cooler includes an upper base plate and a lower base plate. The limiting step abuts only against the lower base plate, and there is a clearance between the upper base plate and the limiting block.

[0006] Preferably, the movable guide rod has an end block on the side away from the heat-conducting base plate, and the locking spring is disposed between the end block and the limiting block.

[0007] Preferably, the heat-conducting base plate is provided with a support protrusion on the side near the limiting block, and the bottom of the limiting block is provided with a groove. During the movement of the limiting block relative to the heat-conducting base plate, the support protrusion can engage with the groove.

[0008] Preferably, the limiting block includes a main limiting part, which includes a limiting step and a gap limiting surface located above the limiting step, and the allowance gap is located between the upper substrate and the gap limiting surface.

[0009] Preferably, the main limiting part is provided with a relief recess, so that when the thermoelectric cooler is clamped between the limiting block and the positioning post, the corners of the thermoelectric cooler are aligned with the relief recess.

[0010] Preferably, the heat-conducting base plate is provided with an installation groove, the bottom of the installation groove is provided with an installation through hole, and the heat-conducting base plate is provided with a bolt groove on the side opposite to the installation groove. A locking bolt is connected in the bolt groove, and the locking bolt passes through the installation through hole and is connected to the positioning post.

[0011] Preferably, the limiting block includes a fixed limiting part and a swing limiting part. The limiting step is disposed on the fixed limiting part. There is a margin gap between the swing limiting part and the thermoelectric cooler. The swing limiting part includes a correction slope disposed near the side of the thermoelectric cooler. When the swing limiting part is centered, the correction slope is inclined relative to the limiting step. When the upper substrate and the lower substrate are aligned, the swing limiting part can rotate until the correction slope fits against the upper substrate.

[0012] Preferably, the fixed limiting part is provided with a rotating shaft, the positioning limiting part is rotatably connected to the rotating shaft, the positioning limiting part is provided with a scale, and the rotating shaft is provided with a positioning pointer.

[0013] Preferably, the bottom of the positioning limiting part is provided with a positioning edge, and the top of the fixed limiting part is provided with a limiting edge. When the positioning limiting part is centered, there is a gap between the positioning edge and the limiting edge.

[0014] Preferably, the positioning limiting part is provided with reset elastic elements that connect to the fixed limiting part on both sides.

[0015] The beneficial effects of this invention are as follows: (1) It can avoid vertical restriction on the upper substrate while ensuring that there is no obvious positional displacement during the welding process of the upper and lower substrates. This allows the upper substrate to settle under its own weight after the solder melts, ensuring a tight connection at the weld. (2) It can be adapted to various specifications of thermoelectric coolers, improving the adaptability of welding equipment; (3) It can automatically clamp the thermoelectric cooler, thereby maintaining the stability of the thermoelectric cooler during the welding process; (4) When the thermoelectric cooler is clamped on the welding device, the alignment of the upper and lower substrates can be corrected simultaneously to ensure that the upper and lower substrates are accurately aligned before welding, thereby reducing the offset after the solder melts and ensuring the quality control after welding. Attached Figure Description

[0016] Figure 1 This is an isometric view of the present invention.

[0017] Figure 2 This is an exploded view of the present invention.

[0018] Figure 3 This is a first partial sectional view of the present invention.

[0019] Figure 4 This is a second partial sectional view of the present invention.

[0020] Figure 5 This is a partial isometric view of Example 2.

[0021] Figure 6 This is the flowchart of the operation in Example 2.

[0022] In the picture: 1. Heat-conducting base plate; 11. Supporting protrusion; 12. Mounting groove; 13. Mounting through hole; 14. Bolt groove; 15. Locking bolt. 2 positioning posts; 3 thermoelectric cooler, 31 upper substrate, 32 lower substrate; 4. Movable guide rod; 41. Locking spring; 42. End block; 5 Limiting block, 51 Limiting step, 52 Groove, 53 Main limiting part, 54 Gap limiting surface, 55 Avoiding recess, 56 Fixed limiting part, 561 Limiting edge, 57 Positioning limiting part, 571 Dial, 572 Positioning edge, 58 Correction slope, 59 Rotating shaft, 591 Positioning pointer. 6. Remaining clearance. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1:

[0025] like Figure 1 , Figure 2As shown, a welding device for improving the reliability of a thermoelectric cooler includes a heat-conducting base plate 1, on which a plurality of positioning posts 2 are provided. The positioning posts 2 are arranged along the edge of the thermoelectric cooler 3. A movable guide rod 4 is connected to the heat-conducting base plate 1. A limit block 5 is slidably connected to the movable guide rod 4. A locking spring 41 is provided on the movable guide rod 4 to abut against the limit block 5. The limit block 5 includes a limit step 51 protruding from the side near the positioning posts 2. The thermoelectric cooler 3 includes an upper base plate 31 and a lower base plate 32. The limit step 51 abuts only against the lower base plate 32. There is a clearance 6 between the upper base plate 31 and the limit block 5.

[0026] The cooling principle of the TEC (Thermal-electric cooler) is the Peltier effect, which is well-known. When flux is not fully evaporated during the soldering process, solder porosity can form. Misalignment of the upper substrate 31 and lower substrate 32 during soldering can cause misalignment of the current-guiding copper sheets, resulting in the migration of semiconductor particles between the sheets and incomplete soldering onto the sheets. On one hand, the reliability of the TEC during operation is directly related to the cross-sectional area of ​​the semiconductor particles. If the flux in the solder is not properly evaporated during soldering, it will remain between the semiconductor particles and the current-guiding copper sheets, forming porosity. R=ρL / S. Porosity reduces the effective contact area between the semiconductor particles and the current-guiding copper sheets, inevitably leading to an increase in the thermal resistance of a single semiconductor. According to I=U / R, the corresponding Imax decreases, making individual semiconductor particles more prone to burnout and failure, thus affecting the reliability of the TEC. Current conventional solutions improve porosity by adjusting the heating curve, reasonably increasing and maintaining the temperature, controlling the peak temperature, and using a nitrogen atmosphere for soldering. This solution can mitigate the impact of porosity to a certain extent. On the other hand, the offset of the upper and lower substrates 32 causes the semiconductor particles to shift, reducing the effective contact area with the current guide plate. This inevitably affects the current density per unit area. J=I / S, and an increase in current density leads to an increase in temperature, which in turn increases resistance. As can be seen from the above, this also affects the reliability of the TEC. The current conventional solution is to apply a certain pressure to the product during heating to suppress the flow of solder during the melting process. However, applying pressure will prevent the pores from being fully discharged.

[0027] To address the aforementioned problems, this embodiment employs a welding device that improves the reliability of the thermoelectric cooler 3. The device includes a heat-conducting base plate 1, which has excellent heat transfer properties. Preferably, the heat-conducting base plate 1 completely covers the lower substrate 32 of the thermoelectric cooler 3, ensuring uniform heat transfer to the lower substrate 32 and guaranteeing welding quality. Positioning posts 2 are provided on the heat-conducting base plate 1. Several positioning posts 2 are provided, and their relative arrangement is adjusted according to the thermoelectric cooler 3 to be welded. In this embodiment, four positioning posts 2 are provided, symmetrically arranged along a center line. Two positioning posts 2 on one side are aligned with one side of the thermoelectric cooler 3, thereby improving the alignment and stability of one side during welding and aiding in pre-positioning of the thermoelectric cooler 3. A limiting block 5 is connected to the heat-conducting base plate 1. The limiting block 5 and the thermoelectric cooler 3 are relatively movable. Specifically, a movable guide rod 4 is connected to the heat-conducting base plate 1. In this embodiment, the end of the movable guide rod 4 is threaded and connected to both sides of the heat-conducting base plate 1 by bolts. The limiting block 5 is provided with a through hole through which the movable guide rod 4 can pass. The movable guide rod 4 passes through the through hole and connects to the heat-conducting base plate 1. In addition to the screw area connecting to the heat-conducting base plate 1 and the area passing through the limiting block 5, the movable guide rod 4 also has a certain movable area for the limiting block 5 to move and for placing the locking spring 41. By setting the locking spring 41, an elastic force can be applied to the limiting block 5 to move closer to the heat-conducting base plate 1, thereby enabling the limiting block 5 to generate an area that moves closer to the heat-conducting base plate 1. In this embodiment, the area where the limiting block 5 and the thermoelectric cooler 3 dock is a corner structure. Therefore, the limiting block 5 is provided with a beveled recess to abut against the two sides of the corner of the thermoelectric cooler 3. Furthermore, in this embodiment, a limiting step 51 is provided on the limiting block 5. The limiting step 51 protrudes from the abutting plane of the entire limiting block 5. The limiting step 51 only abuts against the lower substrate 32 of the thermoelectric cooler 3. Since the limiting step 51 protrudes from the abutting plane of the limiting block 5, after the limiting step 51 abuts against the lower substrate 32, a clearance 6 is created between the upper substrate 31 and the limiting block 5. The upper substrate 31 will not abut against the limiting block 5 when it is not offset, and even if the upper substrate 31 is offset from the limiting block... After the upper substrate 31 and the positioning post 2 are connected, there will be a clearance 6 between them. That is, the upper substrate 31 cannot simultaneously abut against the limiting block 5 and the positioning post 2. However, due to the presence of the limiting block 5 and the positioning post 2, the upper substrate 31 is subject to certain limiting constraints, so that the upper substrate 31 will not deviate from the limiting block 5 and the positioning post 2. Therefore, the amount of deviation of the upper substrate 31 can be limited by controlling the amount of protrusion of the limiting step 51 (i.e., controlling the clearance 6), so as to avoid the upper substrate 31 from deviating too much.Furthermore, since the upper substrate 31 cannot simultaneously abut against the limiting block 5 and the positioning post 2, although the upper substrate 31 can achieve a certain limiting constraint effect, it cannot be subjected to clamping force. During the welding process, after the solder melts, the upper substrate 31 can sink to a certain extent as the solder melts, ensuring the connection reliability in the solder melting area.

[0028] like Figure 1 , Figure 2 As shown, an end block 42 is provided on the side of the movable guide rod 4 away from the heat-conducting base plate 1, and a locking spring 41 is disposed between the end block 42 and the limiting block 5. The end block 42 is provided on the movable guide rod 4, and the cross-sectional dimension of the end block 42 is larger than that of the movable guide rod 4. The end block 42 is disposed on the side of the movable guide rod 4 away from the heat-conducting base plate 1, so that the locking spring 41 can be located between the limiting block 5 and the end block 42. The two ends of the locking spring 41 abut against the limiting block 5 and the end block 42 respectively, providing a stable elastic force for the limiting block 5.

[0029] like Figure 2 As shown, a support protrusion 11 is provided on the side of the heat-conducting base plate 1 near the limiting block 5, and a groove 52 is provided at the bottom of the limiting block 5. During the movement of the limiting block 5 relative to the heat-conducting base plate 1, the support protrusion 11 can engage with the groove 52. The support protrusion 11 is provided on the heat-conducting base plate 1. Since the thermoelectric cooler 3 in this embodiment is centered on the line connecting the opposite side corners, the corner area of ​​the thermoelectric cooler 3 will protrude from the main body of the heat-conducting base plate 1. Therefore, the support protrusion 11 can fully cover the lower substrate 32 of the thermoelectric cooler 3 to ensure the uniformity of heat conduction. The groove 52 is correspondingly provided on the limiting block 5. The groove 52 is structured to correspond to the support protrusion 11. The groove 52 forms a clearance structure for the support protrusion 11, thereby achieving a stable connection between the limiting block 5 and the heat-conducting base plate 1.

[0030] like Figure 2 , Figure 4 As shown, the limiting block 5 includes a main limiting part 53, which includes a limiting step 51 and a gap limiting surface 54 located above the limiting step 51. The remaining gap 6 is located between the upper substrate 31 and the gap limiting surface 54. The limiting block 5 consists of the main limiting part 53, which is connected to the thermoelectric cooler 3. The main limiting part 53 is provided with the limiting step 51 and the gap limiting surface 54. The remaining gap 6 is the gap area between the gap limiting surface 54 and the upper substrate 31. The gap limiting surface 54 is located above the limiting step 51.

[0031] like Figure 2As shown, the main limiting part 53 is provided with an avoidance recess 55. When the thermoelectric cooler 3 is clamped between the limiting block 5 and the positioning post 2, the corners of the thermoelectric cooler 3 are aligned with the avoidance recess 55. The main limiting part 53 is provided with an avoidance recess 55. Since the limiting block 5 is connected to the corner area of ​​the thermoelectric cooler 3 in this embodiment, the corners of the thermoelectric cooler 3 can avoid interference by providing the avoidance recess 55.

[0032] like Figure 3 As shown, a mounting groove 12 is provided on the heat-conducting base plate 1, and a mounting through hole 13 is provided at the bottom of the mounting groove 12. A bolt groove 14 is provided on the opposite side of the mounting groove 12. A locking bolt 15 is connected in the bolt groove 14. The locking bolt 15 passes through the mounting through hole 13 and connects to the positioning post 2. A positioning post 2 is placed in the mounting groove 12, and a locking bolt 15 is placed in the bolt groove 14. The positioning post 2 is provided with a threaded hole that can be threadedly connected to the locking bolt 15. The positioning post 2 is placed in the mounting groove 12, and the locking bolt 15 is placed in the bolt groove 14 on the opposite side. The locking bolt 15 passes through the mounting through hole 13 and connects to the positioning post 2, thereby realizing the installation of the positioning post 2.

[0033] In this embodiment, the above-mentioned technical solution can avoid vertical restriction on the upper substrate while ensuring that there is no significant positional displacement during the welding process of the upper and lower substrates. This allows the upper substrate to settle under its own gravity after the solder melts, ensuring a tight connection at the weld. It can also be adapted to various specifications of thermoelectric coolers, improving the adaptability of the welding device. Furthermore, it can automatically clamp the thermoelectric cooler, thereby maintaining the stability of the thermoelectric cooler during the welding process.

[0034] Example 2:

[0035] like Figure 5 , Figure 6As shown, a welding apparatus for improving the reliability of a thermoelectric cooler includes a heat-conducting base plate 1, on which a plurality of positioning posts 2 are arranged along the edge of a thermoelectric cooler 3. A movable guide rod 4 is connected to the heat-conducting base plate 1, and a limiting block 5 is slidably connected to the movable guide rod 4. A locking spring 41 is provided on the movable guide rod 4 to abut against the limiting block 5. The limiting block 5 includes a limiting step 51 protruding from the side near the positioning posts 2. The thermoelectric cooler 3 includes an upper substrate 31 and a lower substrate 32. The limiting step 51 abuts only against the lower substrate 32, and there is a clearance 6 between the upper substrate 31 and the limiting block 5. An end block 42 is provided on the side of the movable guide rod 4 away from the heat-conducting base plate 1, and the locking spring 41 is disposed between the end block 42 and the limiting block 5. A supporting protrusion 11 is provided on the side of the heat-conducting base plate 1 near the limiting block 5. A groove 52 is provided at the bottom of the limiting block 5. During the movement of the limiting block 5 relative to the heat-conducting base plate 1, the supporting protrusion 11 can engage with the groove 52. An avoidance recess 55 is provided on the main limiting part 53. When the thermoelectric cooler 3 is clamped between the limiting block 5 and the positioning post 2, the corners of the thermoelectric cooler 3 align with the avoidance recess 55. An installation groove 12 is provided on the heat-conducting base plate 1. An installation through hole 13 is provided at the bottom of the installation groove 12. A bolt groove 14 is provided on the side opposite to the installation groove 12. A locking bolt 15 is connected in the bolt groove 14. The locking bolt 15 passes through the installation through hole 13 and connects to the positioning post 2. The limiting block 5 includes a fixed limiting part 56 and a positioning limiting part 57. The limiting step 51 is provided on the fixed limiting part 56. There is a margin gap 6 between the positioning limiting part 57 and the thermoelectric cooler 3. The positioning limiting part 57 includes a correction slope 58 provided near the side of the thermoelectric cooler 3. When the positioning limiting part 57 is in the center state, the correction slope 58 is inclined relative to the limiting step 51. When the upper substrate 31 and the lower substrate 32 are aligned, the positioning limiting part 57 can rotate until the correction slope 58 is in contact with the upper substrate 31.

[0036] In this embodiment, the limiting block 5 consists of a fixed limiting part 56 and a swing limiting part 57. The swing limiting part 57 is rotatably connected to the fixed limiting part 56 and can rotate relative to the fixed limiting part 56. A limiting step 51 is provided on the fixed limiting part 56. The limiting step 51 does not move relative to the lower substrate 32. There is a clearance 6 between the swing limiting part 57 and the thermoelectric cooler 3, so that the swing limiting part 57 can swing within the stroke range of the clearance 6. The surface of the positioning limit part 57 that abuts the thermoelectric cooler 3 (correction slope 58) is not flush with the abutment surface of the limiting step 51, but has a certain offset angle. This means that when the positioning limit part 57 is in the centered state, the end of the correction slope 58 closer to the rotation center of the positioning limit part 57 is closer to the thermoelectric cooler 3, while the end farther from the rotation center is farther from the thermoelectric cooler 3. Therefore, when the positioning limit part 57 rotates to its limit position in one direction, one of the correction slopes 58 of the positioning limit part 57 will... The limiting step 51 is flush with the contact surface of the thermoelectric cooler 3. At this time, by observing the adhesion state between the correction slope 58 and the upper substrate 31, the position state of the upper substrate 31 relative to the lower substrate 32 is corrected. Then, by rotating the positioning limiting part 57 in the opposite direction, the overall alignment of the upper substrate 31 and the lower substrate 32 can be corrected by comparing it with the correction slope 58 on the other side. If the offset of the upper substrate 31 relative to the lower substrate 32 is large and asymmetrical before welding, it will affect the welding quality. During the welding process, the controllability of the displacement of the upper substrate 31 due to the melting of solder decreases. In this embodiment, after the thermoelectric cooler 3 is placed on the welding device, the relative positions of the upper substrate 31 and the lower substrate 32 are corrected to ensure the alignment of the upper substrate 31 and the lower substrate 32. When the upper substrate 31 and the lower substrate 32 are completely aligned, the controllability of the displacement and direction of the upper substrate 31 is higher after the solder melts, and the movement of each thermoelectric cooler 3 tends to be consistent, ensuring the uniformity of quality control after welding. After the correction slopes 58 on both sides have completed the correction of the upper substrate 31 and the lower substrate 32, during the welding process, the positioning limit part 57 and the positioning post 2 still cannot form a locking limit constraint effect on the upper substrate 31, allowing the upper substrate 31 to settle after the solder melts, ensuring the welding quality.

[0037] like Figure 6As shown, a rotating shaft 59 is provided on the fixed limiting part 56, and a positioning limiting part 57 is rotatably connected to the rotating shaft 59. A scale 571 is provided on the positioning limiting part 57, and a positioning pointer 591 is provided on the rotating shaft 59. The positioning limiting part 57 rotates relative to the rotating shaft 59, which is connected to the fixed limiting part 56. During the rotation of the positioning limiting part 57, the rotating shaft 59 remains relatively fixed. The positioning pointer 591 is provided on the rotating shaft 59, and the scale 571 is provided on the positioning limiting part 57. During the rotation of the positioning limiting part 57, the scale 571 changes relative to the positioning pointer 591. This allows for a direct comparison of the left and right rotation of the swing limiting part during the calibration of the thermoelectric cooler 3 by the left and right rotation of the positioning limiting part 57, thereby determining the symmetry of the upper substrate 31.

[0038] like Figure 5 As shown, the bottom of the positioning limiting part 57 is provided with a positioning edge 572, and the top of the fixed limiting part 56 is provided with a limiting edge 561. When the positioning limiting part 57 is centered, there is a gap between the positioning edge 572 and the limiting edge 561. The positioning limiting part 57 is located at the bottom with a positioning edge 572, and the fixed limiting part 56 is located at the top with a limiting edge 561. The positioning limiting part 57 is located at the top of the fixed limiting part 56, thus allowing the positioning edge 572 to engage with the limiting edge 561. This limits the amount of rotation of the positioning limiting part 57 during its rotation. When the positioning limiting part 57 is in the centered state, there is a gap between the positioning edge 572 and the limiting edge 561. The amount of the gap is set so that when the positioning edge 572 abuts against the limiting edge 561, the correcting slope 58 is just aligned with the limiting step 51. This prevents the rotation amount of the positioning limiting part 57 from exceeding the limit step 51, thus having a reverse corrective effect on the alignment of the upper substrate 31 and the lower substrate 32.

[0039] Symmetrically arranged on both sides of the positioning limiting part 57 are reset elastic members that connect to the fixed limiting part 56. The other end of each reset elastic member is connected to the fixed limiting part 56, allowing the positioning limiting part 57 to remain centered without external force. This prevents the correction slopes 58 on both sides from contacting the thermoelectric cooler 3 during welding, thus affecting the alignment between the upper substrate 31 and the lower substrate 32. This ensures no external force is applied to the upper substrate 31 during welding and facilitates rapid centering alignment during cycles, improving correction judgment efficiency. The elastic reset member can be a spring connecting the positioning limiting part 57 and the fixed limiting part 56. A placement groove is formed between the positioning limiting part 57 and the fixed limiting part 56, with the spring placed symmetrically within the groove. The two ends of the spring abut against the positioning limiting part 57 and the fixed limiting part 56, respectively. Alternatively, the elastic reset member can be a torsion spring symmetrically arranged on the rotating shaft 59.

[0040] In addition to the above embodiments, within the scope disclosed in the claims and specification of this invention, the technical features of this invention can be reselected and combined to form new embodiments. These can be achieved by those skilled in the art without creative effort. Therefore, these embodiments not described in detail in this invention should also be regarded as specific embodiments of this invention and within the protection scope of this invention.

Claims

1. A welding apparatus for improving the reliability of thermoelectric coolers, characterized in that, The device includes a heat-conducting base plate with several positioning posts arranged along the edge of the thermoelectric cooler. A movable guide rod is connected to the heat-conducting base plate, and a limit block is slidably connected to the movable guide rod. A locking spring is provided on the movable guide rod to abut against the limit block. The limit block includes a limiting step protruding from the side near the positioning posts. The thermoelectric cooler includes an upper base plate and a lower base plate. The limiting step abuts only against the lower base plate, and there is a clearance between the upper base plate and the limit block.

2. The welding apparatus for improving the reliability of thermoelectric coolers according to claim 1, characterized in that, The movable guide rod has an end block on the side away from the heat-conducting base plate, and the locking spring is located between the end block and the limiting block.

3. The welding apparatus for improving the reliability of thermoelectric coolers according to claim 1, characterized in that, The heat-conducting base plate is provided with a support protrusion on the side near the limiting block, and the bottom of the limiting block is provided with a groove. During the movement of the limiting block relative to the heat-conducting base plate, the support protrusion can engage with the groove.

4. The welding apparatus for improving the reliability of thermoelectric coolers according to claim 1, characterized in that, The limiting block includes a main limiting part, which includes a limiting step and a gap limiting surface located above the limiting step. The allowance gap is located between the upper substrate and the gap limiting surface.

5. The welding apparatus for improving the reliability of thermoelectric coolers according to claim 4, characterized in that, The main limiting part is provided with a relief recess. When the thermoelectric cooler is clamped between the limiting block and the positioning post, the corners of the thermoelectric cooler are aligned with the relief recess.

6. The welding apparatus for improving the reliability of thermoelectric coolers according to claim 1, characterized in that, The heat-conducting base plate is provided with an installation groove, and the bottom of the installation groove is provided with an installation through hole. The heat-conducting base plate is provided with a bolt groove on the opposite side of the installation groove. A locking bolt is connected in the bolt groove, and the locking bolt passes through the installation through hole and is connected to the positioning post.

7. A welding apparatus for improving the reliability of thermoelectric coolers according to any one of claims 1-6, characterized in that, The limiting block includes a fixed limiting part and a positioning limiting part. The limiting step is disposed on the fixed limiting part. There is a margin gap between the positioning limiting part and the thermoelectric cooler. The positioning limiting part includes a correction slope disposed near the side of the thermoelectric cooler. When the positioning limiting part is centered, the correction slope is inclined relative to the limiting step. When the upper substrate and the lower substrate are aligned, the positioning limiting part can rotate until the correction slope is in contact with the upper substrate.

8. The welding apparatus for improving the reliability of thermoelectric coolers according to claim 7, characterized in that, The fixed limiting part is provided with a rotating shaft, the positioning limiting part is rotatably connected to the rotating shaft, the positioning limiting part is provided with a scale, and the rotating shaft is provided with a positioning pointer.

9. The welding apparatus for improving the reliability of thermoelectric coolers according to claim 7, characterized in that, The bottom of the positioning limiting part is provided with a positioning edge, and the top of the fixed limiting part is provided with a limiting edge. When the positioning limiting part is centered, there is a gap between the positioning edge and the limiting edge.

10. A welding apparatus for improving the reliability of thermoelectric coolers according to claim 7, characterized in that, The positioning limiting part is symmetrically provided with reset elastic elements that connect to the fixed limiting part on both sides.

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