Heating plate structure for vacuum eutectic furnace

Abstract

The utility model relates to the technical field of vacuum welding, in particular to a heating plate structure for a vacuum eutectic furnace. Comprising an upper-layer heating plate and a lower-layer heating plate which are mechanically connected, and the end faces of the upper-layer heating plate and the lower-layer heating plate are tightly attached; a heating pipe mounting cavity is formed in the lower-layer heating plate, the heating pipe is embedded into the mounting cavity, and the heating area of the heating pipe is completely wrapped by the mounting cavity; a cooling pipeline is pre-embedded in the lower-layer heating plate, is embedded along a groove formed in the surface of the heating plate and is flush with the surface of the heating plate; a plurality of positioning clamping grooves for fixing welding workpieces are formed in the surface of the upper-layer heating plate, and thermocouple detection positions are uniformly distributed around the positioning clamping grooves; the heating pipe and the cooling pipeline are independently controlled, heat of the heating pipe is conducted to the upper heating plate through the lower heating plate, and the cooling pipeline is used for rapidly guiding out heat in a vacuum environment. Efficient heat conduction, uniform temperature field distribution and rapid heat dissipation are achieved, and the welding quality and the production efficiency are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of vacuum welding technology, and in particular to a heating plate structure for a vacuum eutectic furnace. Background Technology

[0002] In modern industrial production, vacuum eutectic furnaces are widely used as important welding equipment in fields such as electronics, aerospace, and automotive manufacturing to achieve high-precision, high-quality welding processes. By performing welding in a high-vacuum environment, vacuum eutectic furnaces effectively avoid oxidation and contamination, thereby improving the strength and reliability of weld joints. However, existing vacuum eutectic furnace heating plate structures have some technical bottlenecks that limit further performance improvements.

[0003] Traditional vacuum eutectic furnace heating plates typically employ a single-layer structure, often made of a single material such as aluminum, copper, or ceramic. These heating plates suffer from low heating efficiency, primarily because the heating elements are usually installed at the bottom of the plate. Heat is transferred to the plate via radiation, but only a portion is effectively absorbed, resulting in slow heating and uneven heating. Furthermore, traditional heating plates have poor heat dissipation; after welding, heat can only be transferred to the furnace body for cooling, leading to prolonged cooling times and significantly impacting welding efficiency. Some welding processes require rapid cooling, which traditional heating plates cannot meet. Additionally, the materials used in traditional heating plates struggle to achieve ideal uniformity in thermal conductivity, coefficient of thermal expansion, and cooling processes, resulting in high weld void rates and inconsistent weld quality. These problems not only affect production efficiency but also increase production costs, becoming key factors restricting the development of vacuum eutectic furnace technology.

[0004] To address the above problems, this utility model proposes a heating plate structure for a vacuum eutectic furnace. Utility Model Content

[0005] The purpose of this invention is to provide a heating plate structure for a vacuum eutectic furnace, so as to solve the problems of uneven heating, slow cooling and high welding void rate caused by low thermal radiation efficiency of traditional single-layer heating plates in a vacuum environment.

[0006] To achieve the above objectives, the following technical solution is adopted.

[0007] A heating plate structure for a vacuum eutectic furnace includes: an upper heating plate and a lower heating plate for placing workpieces, wherein the upper heating plate and the lower heating plate are mechanically connected and their end faces are tightly fitted together;

[0008] The lower heating plate has a mounting cavity for the heating tube, the heating tube is embedded in the mounting cavity, and the mounting cavity completely covers the heating area of ​​the heating tube, so that the heat of the heating tube can be conducted to the upper heating plate through the lower heating plate.

[0009] The lower heating plate also has a pre-embedded cooling pipe. The cooling pipe is embedded in the surface of the heating plate through a groove and is flush with the surface of the lower heating plate. The cooling pipe is used to quickly remove heat in a vacuum environment.

[0010] Optionally, the surface of the upper heating plate is provided with a plurality of positioning slots for fixing the welding workpiece, and thermocouple detection positions are evenly distributed around the positioning slots.

[0011] Optionally, the bottom of the lower heating plate is provided with multiple layers of heat insulation plates.

[0012] Optionally, the cooling pipe has a serpentine or spiral layout, and the inner wall of the pipe is provided with a flow-guiding structure to enhance turbulence, the flow-guiding structure including periodic protrusions or grooves.

[0013] Optionally, the bonding surface between the lower heating plate and the upper heating plate is provided with a high thermal conductivity interface layer, which is a metal foil or graphene coating with a thickness of less than 0.1 mm and a coverage area of ​​more than 95% of the bonding surface.

[0014] Optionally, the inlet and outlet of the cooling pipe are connected to an external circulating cooling system, and an elastic sealing assembly is provided at the junction of the cooling pipe and the lower heating plate. The sealing assembly includes a bellows structure or a shape memory alloy compensation ring.

[0015] Optionally, the lower heating plate is made of aluminum alloy, and the upper heating plate is made of graphite.

[0016] Optionally, a reflective partition is provided on the top of the upper heating plate, and a reflective layer is provided on the side of the reflective partition near the upper heating plate to reflect the emitted heat back to the upper heating plate.

[0017] Optionally, the heating plate structure can be detachably integrated into the lifting platform of the vacuum eutectic furnace, and the bottom of the lifting platform is provided with a vibration suppression mechanism, which includes an air flotation damping layer or an electromagnetic damper, to reduce the thermal stress disturbance transmitted mechanically in a vacuum environment.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention proposes a double-layer heating plate structure, which significantly improves the heating efficiency and heat dissipation performance of a vacuum eutectic furnace. Specifically, the lower heating plate contains a cavity for mounting heating tubes, allowing heat from the heating tubes to be efficiently conducted to the upper heating plate, avoiding heat loss problems in traditional heating methods and thus significantly accelerating the heating rate. Simultaneously, pre-embedded cooling pipes within the lower heating plate can rapidly dissipate heat in a vacuum environment, effectively shortening the cooling time and meeting the process requirements for rapid cooling. This double-layer structure design not only improves heating efficiency but also optimizes heat dissipation performance, significantly reducing weld voids and improving weld quality.

[0020] Furthermore, the performance of the heating plate has been optimized. For example, the design of the positioning slots and thermocouple detection positions on the surface of the upper heating plate makes the fixation of the welded workpiece more stable and the temperature monitoring more accurate, further improving the stability of welding quality. The multi-layer heat insulation plate set at the bottom of the lower heating plate effectively reduces heat loss downwards, improving energy utilization efficiency. The serpentine or spiral layout of the cooling pipes and the flow guiding structure that enhances turbulence further enhances heat dissipation efficiency. The design of the high thermal conductivity interface layer reduces thermal resistance and ensures rapid heat conduction. The setting of the elastic sealing component improves the reliability and stability of the cooling system. The combination of aluminum alloy and graphite materials fully utilizes the advantages of both materials, further optimizing the performance of the heating plate. The design of the reflective baffle reduces heat loss and improves energy utilization efficiency. The setting of the temperature gradient control module enables precise control of the heating and cooling process, ensuring temperature uniformity and stability. The detachable design of the heating plate structure and the setting of the vibration suppression mechanism improve the flexibility and stability of the equipment, further optimizing the welding process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an embodiment of a heating plate structure for a vacuum eutectic furnace according to the present invention.

[0022] Explanation of reference numerals in the attached diagram: 1. Cooling pipe; 2. Heating pipe; 3. Lower heating plate; 4. Upper heating plate; 5. Thermocouple detection position. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0024] The following detailed description is exemplary and intended to provide further detailed explanation of the present invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention.

[0025] like Figure 1 As shown, this utility model relates to a heating plate structure for a vacuum eutectic furnace, which aims to improve heating efficiency, heat dissipation performance and welding quality by optimizing the design of the heating plate, while meeting the process requirements of rapid cooling.

[0026] The heating plate structure of this invention consists of an upper heating plate 4 and a lower heating plate 3, which are tightly bonded together by mechanical connection. This double-layer structure design makes full use of the advantages of different materials while solving many problems of traditional single-layer heating plates.

[0027] The lower heating plate 3 is made of 6063 aluminum alloy, a material with good thermal conductivity and a moderate coefficient of thermal expansion, which allows it to maintain stable structural performance at high temperatures. The lower heating plate 3 contains an internal cavity for the heating tube 2, which is embedded within it, and the cavity completely covers the heating area of ​​the heating tube 2. This design allows the heat generated by the heating tube 2 to be efficiently transferred to the lower heating plate 3, avoiding the heat loss problem in traditional heating methods, thus significantly improving heating efficiency.

[0028] The lower heating plate 3 also has a pre-embedded cooling pipe 1. The cooling pipe 1 is embedded along the surface of the heating plate through grooves and is processed to be flush with the surface of the heating plate. The layout path of the cooling pipe 1 can be serpentine or spiral. This design can increase the contact area between the cooling water and the heating plate, further improving heat dissipation efficiency. The inner wall of the cooling pipe 1 is also provided with a flow-guiding structure to enhance turbulence, such as periodic protrusions or grooves. These structures can effectively enhance the turbulence of the cooling water, further improving heat exchange efficiency.

[0029] The upper heating plate 4 is made of graphite, a material with excellent thermal conductivity and good thermal stability, maintaining stable performance at high temperatures. The surface of the upper heating plate 4 has multiple positioning slots for fixing the workpieces to be welded. These positioning slots can be designed according to the shape and size of different workpieces to achieve a better fit, thereby reducing the weld void rate. In addition, thermocouple detection positions 5 are evenly distributed around the positioning slots for real-time monitoring of the temperature distribution of the heating plate. Thermocouple detection positions 5 can be distributed at the four corners and the center area of ​​the upper heating plate 4, with each detection position equidistant from the positioning slots. This ensures the accuracy and uniformity of temperature detection. The thermocouples can wirelessly transmit temperature data to the control system in real time for precise control of the heating process.

[0030] In one specific embodiment of this invention, the positioning slots of the upper heating plate 4 adopt a replaceable modular structure. Each positioning slot has an adaptive-shaped adapter on its contact surface with the welding workpiece. The adapter can be fixed within the positioning slot by snap-fit ​​or magnetic adsorption. This design allows the heating plate to adapt to welding workpieces of different shapes and sizes, improving its versatility and flexibility. Furthermore, the adapter can be customized according to the specific needs of the workpiece, further optimizing the welding effect.

[0031] To further improve heat transfer efficiency, a high thermal conductivity interface layer is provided on the bonding surface between the lower heating plate 3 and the upper heating plate 4. This interface layer can be made of metal foil or graphene coating, with a thickness of less than 0.1 mm and a coverage area greater than 95% of the bonding surface. This high thermal conductivity interface layer can effectively reduce thermal resistance and ensure that heat can be quickly and evenly transferred from the lower heating plate 3 to the upper heating plate 4.

[0032] An external circulating cooling system is connected to the inlet and outlet of cooling pipe 1. At the junction of cooling pipe 1 and the lower heating plate 3, an elastic sealing component, such as a bellows structure or a shape memory alloy compensation ring, is provided. This sealing component effectively prevents cooling water leakage and can also adapt to dimensional changes in the heating plate during thermal expansion and contraction, ensuring the reliability and stability of the cooling system.

[0033] The inner wall of the mounting cavity for the heating tube 2 is provided with a reflective coating, which can be a multilayer metal oxide composite film. This reflective coating can directionally reflect the radiant heat from the heating tube 2 to the interior of the lower heating plate 3, further improving heat utilization and reducing heat loss.

[0034] The heating plate structure of this invention also includes a temperature gradient control module. This module dynamically adjusts the power of the heating tube 2 and the flow rate of the cooling pipe 1 based on real-time data from the thermocouple detection position 5, ensuring that the temperature difference between different areas of the upper heating plate 4 is less than ±2℃. This temperature gradient control module ensures the temperature uniformity of the heating plate during the welding process, thereby improving the welding quality.

[0035] In practical implementation, the temperature gradient control module can adjust the power of the heating tube 2 in real time based on the preset temperature curve and the actual detected temperature data using a PID control algorithm. Simultaneously, the flow rate of the cooling pipe 1 can also be dynamically adjusted based on temperature feedback to ensure the requirements of rapid heating, uniform heat preservation, and rapid cooling during the welding process.

[0036] The heating plate structure is detachably integrated into the lifting platform of the vacuum eutectic furnace. This design makes the installation and maintenance of the heating plate more convenient and also improves the flexibility of the equipment. The bottom of the lifting platform is equipped with a vibration suppression mechanism, such as an air-floating damping layer or an electromagnetic damper. This vibration suppression mechanism can reduce mechanically transmitted thermal stress disturbances in a vacuum environment, thereby improving the stability and reliability of the welding process.

[0037] Specifically, the air-floating damping layer reduces vibrations generated by the lifting platform during movement through the elastic buffering effect of the gas. The electromagnetic damper, on the other hand, suppresses vibration propagation in real time through electromagnetic induction. The combination of these two vibration suppression mechanisms effectively reduces thermal stress disturbances during welding, ensuring the stability of welding quality.

[0038] The bottom of the lower heating plate 3 is equipped with multiple layers of heat insulation board. This heat insulation board can be made of heat insulation materials such as ceramic fiber, which can effectively reduce the downward transfer of heat, improve energy utilization efficiency, and protect the furnace structure from high temperature.

[0039] A reflective baffle is provided on the top of the upper heating plate 4, and a reflective layer is provided on the side of the reflective baffle closest to the upper heating plate 4. This reflective layer can be made of materials such as metal oxide coating, and its function is to reflect the emitted heat back to the upper heating plate 4, reduce heat loss, and further improve heating efficiency.

[0040] In one specific embodiment of this invention, the upper heating plate 4 and the lower heating plate 3 are fixed together by high heat-resistant bolts. Ceramic heat-insulating gaskets are placed on the contact surfaces between the bolts and the heating plates to prevent heat from being conducted to the outside through the bolts. This design not only achieves a reliable connection but also reduces heat loss and improves heating efficiency.

[0041] In another specific embodiment of this utility model, the upper heating plate 4 and the lower heating plate 3 adopt a tenon-and-mortise locking structure. The gap of the tenon-and-mortise structure is filled with thermally conductive silicone grease. This structure not only enables a reliable connection, but also further improves the heat conduction efficiency, ensuring that heat can be quickly and evenly conducted from the lower heating plate 3 to the upper heating plate 4.

[0042] In one specific embodiment of this utility model, the bottom of the lower heating plate 3 is provided with multiple layers of heat insulation plates. These heat insulation plates are made of heat insulation materials such as ceramic fiber, which can effectively reduce heat transfer downwards, improve energy utilization efficiency, and protect the furnace structure from high temperatures. The number of heat insulation plates can be adjusted according to actual needs to achieve the best heat insulation effect.

[0043] In one specific embodiment of this utility model, a reflective partition is provided on the top of the upper heating plate 4. A reflective layer is provided on the side of the reflective partition closest to the upper heating plate 4. This reflective layer can be made of materials such as a metal oxide coating, and its function is to reflect the emitted heat back to the upper heating plate 4, reducing heat loss and further improving heating efficiency. The size and shape of the reflective partition can be adjusted according to the specific design of the upper heating plate 4 to ensure optimal reflection effect.

[0044] In one specific embodiment of this utility model, the heating plate structure further includes a temperature gradient control module. This module dynamically adjusts the power of the heating tube 2 and the flow rate of the cooling pipe 1 based on real-time data from the thermocouple detection position 5, ensuring that the temperature difference between different areas of the upper heating plate 4 is less than ±2℃. This temperature gradient control module ensures the temperature uniformity of the heating plate during the welding process, thereby improving the welding quality. In specific implementations, the temperature gradient control module can adjust the power of the heating tube 2 in real time using a PID control algorithm based on a preset temperature curve and actual detected temperature data. Simultaneously, the flow rate of the cooling pipe 1 can also be dynamically adjusted based on temperature feedback to ensure the requirements of rapid heating, uniform heat preservation, and rapid cooling during the welding process.

[0045] In one specific embodiment of this utility model, the heating plate structure is detachably integrated into the lifting platform of the vacuum eutectic furnace, and a vibration suppression mechanism is provided at the bottom of the lifting platform. The vibration suppression mechanism includes an air-floating damping layer or an electromagnetic damper. The combination of these two vibration suppression mechanisms can effectively reduce thermal stress disturbances during the welding process and ensure the stability of welding quality. Specifically, the air-floating damping layer can reduce the vibration generated by the lifting platform during movement through the elastic buffering effect of gas. The electromagnetic damper can suppress the propagation of vibration in real time through the principle of electromagnetic induction. The combination of these two vibration suppression mechanisms can effectively reduce thermal stress disturbances during the welding process and ensure the stability of welding quality.

[0046] As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A hot plate structure for a vacuum eutectic furnace, characterized by, include: The upper heating plate (4) and the lower heating plate (3) are used to place the workpiece. The upper heating plate (4) and the lower heating plate (3) are mechanically connected and their end faces are tightly fitted. The lower heating plate (3) is provided with a mounting cavity for the heating tube (2). The heating tube (2) is embedded in the mounting cavity, and the mounting cavity completely covers the heating area of ​​the heating tube (2) so that the heat of the heating tube (2) can be conducted to the upper heating plate (4) through the lower heating plate (3). The lower heating plate (3) also has a pre-embedded cooling pipe (1). The cooling pipe (1) is embedded in the surface of the heating plate through a groove and is flush with the surface of the lower heating plate (3). The cooling pipe (1) is used to quickly remove heat in a vacuum environment.

2. The heater plate structure for a vacuum eutectic furnace according to claim 1, wherein The upper heating plate (4) has multiple positioning slots for fixing the welded workpiece on its surface, and thermocouple detection positions (5) are evenly distributed around the positioning slots.

3. The heating plate structure for a vacuum eutectic furnace according to claim 1, characterized in that, The bottom of the lower heating plate (3) is provided with multiple layers of heat insulation plates.

4. The heater plate structure for a vacuum eutectic furnace according to claim 1, wherein The cooling pipe (1) has a serpentine or spiral layout, and the inner wall of the pipe is provided with a flow-guiding structure to enhance turbulence, the flow-guiding structure including periodic protrusions or grooves.

5. The heater plate structure for a vacuum eutectic furnace according to claim 1, wherein The lower heating plate (3) and the upper heating plate (4) are bonded to a high thermal conductivity interface layer, which is a metal foil or graphene coating with a thickness of less than 0.1 mm and a coverage area of ​​more than 95% of the bonding surface.

6. The heater plate structure for a vacuum eutectic furnace according to claim 1, wherein The inlet and outlet of the cooling pipe (1) are connected to an external circulating cooling system, and an elastic sealing assembly is provided at the junction of the cooling pipe (1) and the lower heating plate (3).

7. The heater plate structure for a vacuum eutectic furnace according to claim 1, wherein The lower heating plate (3) is made of aluminum alloy, and the upper heating plate (4) is made of graphite.

8. The heater plate structure for a vacuum eutectic furnace according to claim 1, wherein The top of the upper heating plate (4) is provided with a reflective partition, and a reflective layer is provided on the side of the reflective partition near the upper heating plate (4) to reflect the emitted heat back to the upper heating plate (4).

9. A heating plate structure for a vacuum eutectic furnace according to any one of claims 1-8, characterized in that, The heating plate structure is detachably integrated into the lifting platform of the vacuum eutectic furnace, and the bottom of the lifting platform is equipped with a vibration suppression mechanism, which includes an air flotation damping layer or an electromagnetic damper, to reduce the thermal stress disturbance transmitted mechanically in a vacuum environment.

Images