A precision brazing device for a ceramic can body with complex structure and a brazing method thereof

Abstract

The application discloses a kind of complex structure ceramic tank body precision brazing device and welding method thereof, it is related to ceramic brazing field, and brazing device includes tank body body heater, tank body outer surface local induction resistance wire heating bin, tank body internal local induction resistance wire heating bin;Tank body body heater includes electromagnetic induction coil;Tank body outer surface local induction resistance wire heating bin includes first electromagnetic induction heating resistance wire, and tank body internal local induction resistance wire heating bin includes second electromagnetic induction heating resistance wire.The application generates alternating magnetic field in electromagnetic induction coil using high-power high-frequency alternating current power supply, generates eddy current heat on electromagnetic induction heating resistance wire, heats filler metal in tank body internal brazing seam to welding temperature to implement brazing, realizes the rapid forming of internal brazing seam of complex ceramic structure device.And using multiple heaters, realize accurate control of temperature in different regions, reduce temperature gradient, prevent cracking.

Description

Technical Field

[0001] The present invention relates to the field of ceramic brazing, in particular to a precision brazing device for a ceramic tank with a complex structure and a welding method thereof. Background Art

[0002] Due to their excellent physical and chemical properties, ceramic materials are increasingly being chosen as the manufacturing material for high-end devices, playing a vital role in the energy, chemical, and machinery sectors. With the advancement of technology, the structures of devices with specific functions are becoming increasingly complex, necessitating the use of advanced joining technologies to achieve the precision manufacturing of these complex structures. However, ceramics are brittle materials with poor machinability, making them difficult to manufacture using conventional machining methods. Consequently, welding technology has become the only option for manufacturing these complex ceramic structures.

[0003] Traditional ceramic brazing technology uses solder to fill the gaps between ceramic device structures, then melts the solder through high-temperature heating in a heating furnace, and utilizes the wetting phenomenon between the solder and the surface of the ceramic device to form a whole with the solder. When the heating of the ceramic device stops, the temperature of the solder on the device structure will drop, and the solder solidifies to connect the brazed joints together, completing the welding manufacturing of the device structure. However, some functional devices cannot be heated as a whole, such as ceramic cans containing electronic devices. The high temperature of brazing will destroy the physical properties of the electronic devices inside the can, which will limit the use of overall heating brazing technology in the manufacture of these ceramic devices. Although the light heat source radiation heating method that has emerged in recent years can locally heat the welds on the surface of ceramic devices, causing the solder in the welds to melt and then solidify, thereby achieving weld connection, when the weld position is inside the ceramic device and the external heating light source cannot directly radiate the brazing position, this local radiation method of the light heat source cannot achieve the connection of the shielded internal welds.

[0004] In summary, neither the traditional overall heating brazing method nor the recently emerged localized heating method using photothermal radiation sources can meet the requirements for precision welding and manufacturing of these complex ceramic components. Furthermore, neither can achieve the precision manufacturing of complex ceramic components by locally heating welds in locations that are shielded from direct sunlight while maintaining a relatively low overall temperature. These issues limit the application of ceramic materials in the manufacture of precision components for high-end equipment.

[0005] Therefore, technical talents in this field are committed to developing a precision brazing device for complex structure ceramic devices, so as to achieve local precise heating of any structure in the device, and realize the connection of the device structure through the rapid heating and rapid cooling of the pre-set brazing material in the device structure, while reducing the overall temperature increase of the device and protecting the non-high temperature resistant parts inside the device. It can also be suitable for welding in positions that cannot be directly exposed to light and heat sources, realizing the integrated precision brazing manufacturing of complex structure ceramic devices. Summary of the Invention

[0006] In view of the above-mentioned defects of the prior art, the technical problems to be solved by the present invention are: (1) how to achieve rapid heating of the local position of the weld of a complex structure component, form a brazing connection of the weld joint by melting and solidifying the brazing material in the weld, control the overall heat input of the weld by rapid heating and rapid cooling, and prevent the temperature of the internal components of the weld from being too high; (2) how to achieve local heating of the position where direct light cannot reach, and achieve brazing connection; (3) how to achieve precise control of the temperature distribution of the welded ceramic structure by the welding device during the welding process, so as to prevent the ceramic components from cracking during the heating and cooling process of brazing.

[0007] To achieve the above-mentioned purpose, the present invention provides a precision brazing device for a ceramic tank with a complex structure, comprising a tank body heater, a local induction resistance wire heating chamber on the outer surface of the tank, and a local induction resistance wire heating chamber inside the tank;

[0008] The tank body heater includes a tank body preheater housing, an electromagnetic induction coil, and a high-power high-frequency AC power supply externally connected to the electromagnetic induction coil. The electromagnetic induction coil is arranged inside the tank body preheater housing, and the electromagnetic induction coil and the high-power high-frequency AC power supply externally connected to the electromagnetic induction coil are connected by wires;

[0009] The local induction resistance wire heating chamber for the outer surface of the tank comprises a first electromagnetic induction heating resistance wire and a first induction resistance wire support member, wherein the first electromagnetic induction heating resistance wire is connected to the inner wall of the local induction resistance wire heating chamber for the outer surface of the tank via the first induction resistance wire support member;

[0010] The local induction resistance wire heating chamber inside the tank body includes a second electromagnetic induction heating resistance wire and a second induction resistance wire support. The second electromagnetic induction heating resistance wire is connected to the inner wall of the local induction resistance wire heating chamber inside the tank body through the second induction resistance wire support.

[0011] Furthermore, the tank body heater also includes a bottom support frame, which is arranged inside the tank body preheater shell and is connected to the bottom of the inner wall of the tank body preheater shell through a groove.

[0012] Furthermore, the local induction resistance wire heating chamber on the outer surface of the tank also includes an arc-shaped heat insulator, which is arranged at the top of the local induction resistance wire heating chamber on the outer surface of the tank, and the first electromagnetic induction heating resistance wire is arranged at the center of the arc-shaped heat insulator.

[0013] Furthermore, the local induction resistance wire heating chamber on the outer surface of the tank further includes a heating chamber partition, and the heating chamber partition is arranged in the middle of the local induction resistance wire heating chamber on the outer surface of the tank.

[0014] Furthermore, the local induction resistance wire heating chamber inside the tank body includes an internal arc-shaped thermal insulator, which is arranged at the top of the local induction resistance wire heating chamber inside the tank body, and the second electromagnetic induction heating resistance wire is arranged at the center of the internal arc-shaped thermal insulator.

[0015] Furthermore, the tank body heater also includes a tank end insulation cover, a tank outer wall heater, and a tank inner wall heater;

[0016] The thermal insulation cover at the end of the tank body is connected to the upper end of the shell of the preheater of the tank body through a groove, and the thermal insulation cover at the end of the tank body is configured to be openable and closable;

[0017] The tank outer wall heater and the tank inner wall heater are arranged inside the tank body preheater shell, the tank outer wall heater is arranged near the side wall of the tank body preheater shell, and the tank inner wall heater is arranged near the middle of the tank body preheater shell. The tank outer wall heater and the tank inner wall heater are connected to the bottom of the inner wall of the tank body preheater shell through a groove.

[0018] Furthermore, the precision brazing device for a ceramic tank body with a complex structure also includes a tank body inner wall temperature sensor, a tank body outer wall temperature sensor, a tank body outer surface brazing seam temperature sensor, and a tank body inner brazing seam temperature sensor.

[0019] A welding method for a complex structure ceramic tank precision brazing device, comprising the following steps:

[0020] Step 1: applying solder to the outer brazing seam on the outer surface of the ceramic tank body, the inner brazing seam on the outer surface of the tank body, the outer brazing seam inside the tank body, and the inner brazing seam inside the tank body;

[0021] Step 2: Pre-position the local induction resistance wire heating chamber on the outer surface of the tank above the outer brazing seam of the outer surface of the tank and the inner brazing seam of the outer surface of the tank through the first induction resistance wire support member, so that the first electromagnetic induction heating resistance wire is located directly above the outer brazing seam of the outer surface of the tank and the inner brazing seam of the outer surface of the tank;

[0022] The local induction resistance wire heating chamber inside the tank body is pre-placed above the outer ring brazing seam inside the tank body and the inner ring brazing seam inside the tank body through the second induction resistance wire support member, so that the second electromagnetic induction heating resistance wire is located directly above the outer ring brazing seam inside the tank body and the inner ring brazing seam inside the tank body;

[0023] Step 3: Place the ceramic tank body on the bottom support frame of the ceramic tank body heater;

[0024] Step 4: Close the thermal insulation cover at the end of the tank body, start the tank body heater first, and heat the ceramic tank body to the preheating temperature;

[0025] Step 5: Start the electromagnetic induction coil and connect it to a high-power, high-frequency AC power supply. The electromagnetic induction coil generates an alternating magnetic field to generate eddy current heat release on the first electromagnetic induction heating resistance wire and the second electromagnetic induction heating resistance wire, and heat the brazing seam of the outer ring brazing seam of the outer surface of the tank, the brazing seam of the inner ring brazing seam of the outer surface of the tank, the outer ring brazing seam inside the tank, and the brazing seam inside the inner ring brazing seam inside the tank to the welding temperature for brazing.

[0026] Furthermore, the method further comprises the following steps:

[0027] Step 6: Turn off the tank outer wall heater, the tank inner wall heater and the electromagnetic induction coil, connect them to a high-power high-frequency AC power supply, and cool them down with the furnace.

[0028] Furthermore, in step 2, the first electromagnetic induction heating resistance wire is located 0.5-3 cm above the outer brazing seam of the outer surface of the tank body and the inner brazing seam of the outer surface of the tank body, and the second electromagnetic induction heating resistance wire is located 0.5-3 cm above the outer brazing seam of the inner surface of the tank body and the inner brazing seam of the inner surface of the tank body. The technical effects of the present invention are as follows:

[0029] (1) The present invention sets up an electromagnetic induction heating device outside the closed cavity (the electromagnetic induction coil is externally connected to a high-power high-frequency AC power supply) and sets up an electromagnetic induction coil inside the closed cavity, thereby generating an alternating magnetic field in the space of the ceramic tank body, generating eddy current heating on the first induction resistance wire and the second induction resistance wire preset in the tank body, and then indirectly heating the weld at the position of the preset resistance wire through the heat release of the high-temperature resistance wire, thereby heating the solder in the weld. This method can heat non-conductive ceramic materials. Conventional magnetic induction technology directly applies the magnetic field to the heated workpiece. These workpieces must be metal in order to generate eddy currents and heat up under the action of the magnetic field. Therefore, traditional magnetic induction heating technology cannot directly heat ceramic materials. The application scenario of the present invention is to heat ceramic welds. The solder in the weld is a ceramic material, and traditional magnetic induction heating technology cannot be applied.

[0030] (2) The present invention uses a pre-set induction resistance wire method to heat the weld. Since the ceramic tank body itself cannot be heated by the electromagnetic field, only the position of the pre-set induction resistance wire can be heated. Moreover, since the electromagnetic field can penetrate the outer wall of the ceramic tank body, the pre-set resistance wire inside the tank body can be accurately heated, which solves the limitation that infrared light heating can only heat the illuminated position. Ultimately, it can efficiently realize the forming of the internal brazing seam of complex ceramic structure components. In addition, by pre-setting local induction resistance wire heating chambers at multiple positions of the complex ceramic structure component, the welds at multiple positions of the entire ceramic tank body can be formed simultaneously under the action of the electromagnetic field covering the entire ceramic tank body space, which greatly improves production efficiency.

[0031] (3) The electromagnetic induction heating method can achieve rapid heating and rapid cooling, and the heating area is a local area, which will not cause the non-weld position inside the ceramic device to heat too high. If the workpiece is placed in a heat treatment furnace for overall heating, the weld brazing connection can be achieved from the welding perspective alone, because brazing only requires (high) temperature. However, overall heating will cause damage to electrical components in the cavity that are not resistant to high temperatures. This requires that the welding of such parts requires local heating, and only the weld is heated to a high temperature (generally 700-1000 degrees Celsius), while other areas are kept at a lower temperature (generally 200-300 degrees Celsius). The present invention can achieve local induction heating by locally setting a local heating chamber containing an induction resistor wire at the weld position (a local induction resistor wire heating chamber on the outer surface of the tank, a local induction resistor wire heating chamber inside the tank).

[0032] (4) Use multiple heaters to achieve precise temperature control in different areas, reduce temperature gradients, and prevent cracking. Ceramic tanks are prone to cracking under conditions with large temperature gradients. The use of external heaters (the tank body heaters) can achieve brazing preheating effects and post-weld cooling effects, reducing the temperature gradient of the ceramic and avoiding cracking. In addition, the local induction resistance wire heating chamber is equipped with a heat insulator, which has a thermal insulation effect that can effectively prevent the heat of the resistance wire from being transferred to the electronic device storage chamber.

[0033] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of a complex ceramic tank precision integrated brazing device according to a preferred embodiment of the present invention;

[0035] Figure 2 This is an enlarged view of the induction resistance wire heating chamber near the brazing seam on the surface of a ceramic tank body according to a preferred embodiment of the present invention;

[0036] Figure 3This is an enlarged view of the induction resistance wire heating chamber near the brazing seam inside the ceramic tank body of a preferred embodiment of the present invention;

[0037] Among them, Ⅰ-local induction resistance wire heating chamber on the outer surface of the tank, Ⅱ-local induction resistance wire heating chamber inside the tank, Ⅲ-tank body heater, 1-tank end insulation cover, 2-tank body preheater shell, 3-tank outer wall heater, 4-electromagnetic induction coil, 5-ceramic tank, 6-bottom support frame, 7-tank inner wall heater, 8-electromagnetic induction coil external high-power high-frequency AC power supply, 9-tank bottom insulation board, 10-tank inner wall temperature sensor, 11-tank outer wall temperature sensor, 12-tank inner upper half electronic device installation area, 13-internal ceramic insulation Plate, 14-electronic device installation area in the lower half of the interior of the tank body, 15-arc-shaped thermal insulator, 16-first induction resistance wire support, 17-first electromagnetic induction heating resistance wire, 18-temperature sensor of the brazing seam on the outer surface of the tank body, 19-outer ring brazing seam on the outer surface of the tank body, 20-heating chamber partition, 21-inner ring brazing seam on the outer surface of the tank body, 22-internal arc-shaped thermal insulator, 23-temperature sensor of the brazing seam inside the tank body, 24-second electromagnetic induction heating resistance wire, 25-second induction resistance wire support, 26-outer ring brazing seam inside the tank body, 27-inner ring brazing seam inside the tank body. DETAILED DESCRIPTION

[0038] The following describes several preferred embodiments of the present invention with reference to the accompanying drawings to make the present invention clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0039] In the drawings, components with identical structures are denoted by the same reference numerals, and components with similar structures or functions are denoted by similar reference numerals. The size and thickness of each component shown in the drawings are arbitrary and are not limited by the present invention. For clarity, the thickness of components in some places in the drawings is appropriately exaggerated.

[0040] Example 1

[0041] like Figure 1 The complex structure ceramic tank precision brazing device shown includes a tank body heater III, a local induction resistance wire heating chamber I on the outer surface of the tank, a local induction resistance wire heating chamber II inside the tank, a tank inner wall temperature sensor 10, a tank outer wall temperature sensor 11, a tank outer surface brazing seam temperature sensor 18, and a tank inner brazing seam temperature sensor 23.

[0042] The tank body heater III includes a tank body end insulation cover 1, a tank body preheater shell 2, a tank body outer wall heater 3, an electromagnetic induction coil 4, a bottom support frame 6, a tank body inner wall heater 7, an electromagnetic induction coil externally connected to a high-power, high-frequency AC power source 8, and a tank body bottom insulation board 9. The tank body end insulation cover 1 is connected to the upper end of the tank body preheater shell 2 via a groove. The tank body end insulation cover 1 is configured to be openable and closable. The bottom support frame 6 is disposed inside the tank body preheater shell 2 and is connected to the tank body bottom insulation board 9 via a groove. The tank body outer wall heater 3 is disposed near the inner wall of the tank body preheater shell 2. The tank body inner wall heater 7 is disposed near the inner side of the inner wall of the ceramic tank body 5 and is connected to the tank body bottom insulation board 9 via a groove. The electromagnetic induction coil 4 is disposed 5 cm away from the tank body outer wall heater 3 and is connected to the electromagnetic induction coil externally connected to a high-power, high-frequency AC power source 8 via an electric wire.

[0043] like Figure 2 As shown, the local induction resistance wire heating chamber I on the outer surface of the tank includes an arc-shaped insulator 15, a first induction resistance wire support 16, a first electromagnetic induction heating resistance wire 17, and a heating chamber partition 20; wherein, the arc-shaped insulator 15 is arranged at the top of the local induction resistance wire heating chamber I on the outer surface of the tank, the first electromagnetic induction heating resistance wire 17 is arranged at the center of the arc-shaped insulator 15, and is spot-welded to the inner wall of the local induction resistance wire heating chamber I on the outer surface of the tank through the first induction resistance wire support 16, and the heating chamber partition 20 is arranged in the middle of the local induction resistance wire heating chamber I on the outer surface of the tank, and is used to separate two or more first electromagnetic induction heating resistance wires 17, which is conducive to the rapid accumulation of temperature and improves welding efficiency.

[0044] like Figure 3 As shown, the local induction resistance wire heating chamber II inside the tank body includes an internal arc-shaped insulator 22, a second electromagnetic induction heating resistance wire 24, and a second induction resistance wire support 25, wherein the internal arc-shaped insulator 22 is arranged at the top of the local induction resistance wire heating chamber II inside the tank body, and the second electromagnetic induction heating resistance wire 24 is arranged at the center of the internal arc-shaped insulator 22, and is spot-welded to the inner wall of the local induction resistance wire heating chamber II inside the tank body through the second induction resistance wire support 25.

[0045] Example 2

[0046] like Figure 1As shown, the ceramic tank body 5 includes an electronic device mounting area 12 in the upper half of the tank body, an internal ceramic partition 13, and an electronic device mounting area 14 in the lower half of the tank body. The dimensions of the complex annular tank body ceramic selected in this embodiment are an inner wall diameter of 240mm, an outer wall diameter of 300mm, a wall thickness of 2mm, and a height of 200mm. The interior of the ceramic tank is divided into two internal compartments for accommodating electronic devices. Therefore, brazing is required both outside and inside the ceramic tank body 5. Specifically, there are outer brazing seams 19 on the outer surface of the tank body, inner brazing seams 21 on the outer surface of the tank body, outer brazing seams 26 on the inner surface of the tank body, and inner brazing seams 27 on the inner surface of the tank body.

[0047] The tank inner wall temperature sensor 10 is installed on the tank inner wall, the tank outer wall temperature sensor 11 is installed on the tank outer wall, the tank outer surface brazing seam temperature sensor 18 is set at 5 mm away from the outer ring brazing seam 19 of the tank outer surface and the inner ring brazing seam 21 of the tank outer surface, and the tank inner brazing seam temperature sensor 23 is set at 5 mm away from the outer ring brazing seam 26 of the tank inner surface and the inner ring brazing seam 27 of the tank inner body.

[0048] In addition, the maximum temperature resistance of the electronic components assembled in the ceramic tank body 5 is 400°C, the required temperature for soldering is 750°C, and the holding time is 10 minutes. The brazing connection process is realized by using the complex ceramic tank body precision integrated brazing device of the present invention. The specific implementation steps are as follows:

[0049] (1) Clean the surface of the inner and outer walls of the ceramic tank body 5 to remove impurities and grease. Use detergent and a brush to clean the surface and ensure that the surface is dry.

[0050] (2) Then, solder is applied to the outer brazing seam 19 on the outer surface of the tank body, the inner brazing seam 21 on the outer surface of the tank body, the outer brazing seam 26 inside the tank body, and the inner brazing seam 27 inside the tank body on the ceramic tank body 5, ensuring that the solder is evenly distributed in the brazing position area.

[0051] (3) Then, the first induction resistance wire support 16 in the local induction resistance wire heating chamber I of the outer surface of the tank is pre-placed above the outer ring brazing seam 19 of the outer surface of the tank and the inner ring brazing seam 21 of the outer surface of the tank, so that the first electromagnetic induction heating resistance wire 17 is located in the range of 0.5-3 cm above the outer ring brazing seam 19 of the outer surface of the tank and the inner ring brazing seam 21 of the outer surface of the tank.

[0052] The second induction resistance wire support member 25 in the local induction resistance wire heating chamber II is pre-positioned above the outer brazing seam 26 and the inner brazing seam 27 of the tank body, so that the second electromagnetic induction heating resistance wire 24 is located 0.5-3 cm directly above the outer brazing seam 26 and the inner brazing seam 27 of the tank body. The entire local induction resistance wire heating chamber II does not need to be removed from the ceramic tank body after brazing, while the local induction resistance wire heating chamber I on the tank surface can be removed after welding.

[0053] For the outer ring brazing seam 26 inside the tank body and the inner ring brazing seam 27 inside the tank body, the electromagnetic field can pass through the cavity wall of the ceramic tank body 5 to heat the second electromagnetic induction heating resistance wire 24 inside the cavity. After the second electromagnetic induction heating resistance wire 24 is heated, it emits infrared light under high temperature conditions to heat the nearby outer ring brazing seam 26 inside the tank body, thereby realizing an indirect heating method of heating the ceramic weld through the magnetic induction heating coil and then the coil. For welds that are in a position where the light source cannot directly radiate, it is impossible to perform radiation heating through an infrared light source outside the closed cavity because the light cannot pass through the outer wall of the cavity to enter and irradiate the weld inside the cavity. As a ceramic material, ceramic welds cannot be directly heated by an alternating magnetic field. The present invention can achieve local and precise heating of the ceramic welds inside the ceramic tank body through the above method.

[0054] (4) Place the ceramic tank body 5 with the pre-installed local induction resistance wire heating chamber I on the outer surface of the tank body and the pre-installed local induction resistance wire heating chamber II on the bottom support frame 6 of the ceramic tank body heater III, and then close the insulation cover 1 at the end of the tank body to form a closed space.

[0055] (5) After assembly is completed, the tank body heater III is started to heat the ceramic tank body 5 to a preheating temperature of 350°C at a heating rate of 10°C / min. The tank body temperature sensor 10 and the tank body temperature sensor 11 monitor the internal and external temperatures of the ceramic tank body 5 in real time. The electromagnetic induction coil is connected to a high-power high-frequency AC power supply 8, and an alternating magnetic field is generated by the electromagnetic induction coil 4. Eddy current heat is generated on the first electromagnetic induction heating resistor 17 and the second electromagnetic induction heating resistor 24, and the brazing material in the outer ring brazing seam 19 of the outer surface of the tank, the inner ring brazing seam 21 of the outer surface of the tank, the outer ring brazing seam 26 of the inner body, and the inner ring brazing seam 27 of the inner body is heated to 750°C and kept warm for 10 minutes. The tank body outer surface brazing seam temperature sensor 18 and the tank body inner brazing seam temperature sensor 23 monitor the temperature of the brazing seams in real time. This achieves precise temperature control in different areas, reduces temperature gradients, and prevents cracking.

[0056] (6) Turn off the tank outer wall heater 3, the tank inner wall heater 7 and the electromagnetic induction coil externally connected to a high-power high-frequency AC power supply 8, and cool with the furnace.

[0057] (7) Take out the ceramic tank body 5 and complete the entire brazing process.

[0058] The above is a preferred embodiment of the present invention's precision welding device for complex ceramic tanks and its use in the process of precision welding complex ceramic tanks. By generating an alternating magnetic field through an electromagnetic induction coil 4, localized induction resistance wire heating chambers I and II, pre-installed on the outer surface of the ceramic tank 5, can rapidly heat up in the high-frequency alternating magnetic field. This heat release heats and melts the brazing filler metal within the weld seam, bringing the weld seam temperature to the high temperature required for brazing, thereby achieving the brazing process within the complex ceramic tank. Furthermore, the electronic components within the upper and lower electronic component mounting areas 12 and 14 of the ceramic tank 5 can be maintained below 400°C, preventing damage from high temperatures. Furthermore, the ceramic tank 5 is preheated by the outer and inner wall heaters 3 and 7 of the tank body heater III. These heaters maintain the ceramic tank at a relatively high temperature (e.g., 350°C) throughout the brazing process, reducing temperature gradients during the brazing process and preventing cracking of the ceramic tank due to thermal stress.

[0059] The preferred embodiments of the present invention have been described in detail above. It should be understood that numerous modifications and variations based on the concepts of the present invention are possible without inventive effort by those skilled in the art. Therefore, any technical solution that can be derived by one skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A precision brazing device for complex structure ceramic tanks, characterized in that: It includes a tank body heater, a local induction resistance wire heating chamber on the outer surface of the tank, and a local induction resistance wire heating chamber inside the tank; The tank body heater includes a tank body preheater housing, an electromagnetic induction coil, and a high-power high-frequency AC power supply externally connected to the electromagnetic induction coil. The electromagnetic induction coil is arranged inside the tank body preheater housing, and the electromagnetic induction coil and the high-power high-frequency AC power supply externally connected to the electromagnetic induction coil are connected by wires; The local induction resistance wire heating chamber for the outer surface of the tank comprises a first electromagnetic induction heating resistance wire and a first induction resistance wire support member, wherein the first electromagnetic induction heating resistance wire is connected to the inner wall of the local induction resistance wire heating chamber for the outer surface of the tank via the first induction resistance wire support member; The local induction resistance wire heating chamber inside the tank body includes a second electromagnetic induction heating resistance wire and a second induction resistance wire support. The second electromagnetic induction heating resistance wire is connected to the inner wall of the local induction resistance wire heating chamber inside the tank body through the second induction resistance wire support.

2. The complex structure ceramic tank precision brazing device according to claim 1 is characterized in that: The tank body heater further comprises a bottom support frame, which is arranged inside the tank body preheater shell and is connected to the bottom of the inner wall of the tank body preheater shell via a groove.

3. The complex structure ceramic tank precision brazing device according to claim 1 is characterized in that: The local induction resistance wire heating chamber on the outer surface of the tank also includes an arc-shaped heat insulator, which is arranged at the top of the local induction resistance wire heating chamber on the outer surface of the tank, and the first electromagnetic induction heating resistance wire is arranged at the center of the arc-shaped heat insulator.

4. The complex structure ceramic tank precision brazing device according to claim 3 is characterized in that: The local induction resistance wire heating chamber on the outer surface of the tank further includes a heating chamber partition, and the heating chamber partition is arranged in the middle of the local induction resistance wire heating chamber on the outer surface of the tank.

5. The complex structure ceramic tank precision brazing device according to claim 1 is characterized in that: The local induction resistance wire heating chamber inside the tank body includes an internal arc-shaped insulator, which is arranged at the top of the local induction resistance wire heating chamber inside the tank body, and the second electromagnetic induction heating resistance wire is arranged at the center of the internal arc-shaped insulator.

6. The complex structure ceramic tank precision brazing device according to claim 2, characterized in that: The tank body heater also includes a tank end insulation cover, a tank outer wall heater, and a tank inner wall heater; The thermal insulation cover at the end of the tank body is connected to the upper end of the shell of the preheater of the tank body through a groove, and the thermal insulation cover at the end of the tank body is configured to be openable and closable; The tank outer wall heater and the tank inner wall heater are arranged inside the tank body preheater shell, the tank outer wall heater is arranged near the side wall of the tank body preheater shell, and the tank inner wall heater is arranged near the middle of the tank body preheater shell. The tank outer wall heater and the tank inner wall heater are connected to the bottom of the inner wall of the tank body preheater shell through a groove.

7. The complex structure ceramic tank precision brazing device according to claim 1 is characterized in that: The complex structure ceramic tank precision brazing device also includes a tank inner wall temperature sensor, a tank outer wall temperature sensor, a tank outer surface brazing seam temperature sensor, and a tank inner brazing seam temperature sensor.

8. A welding method for a ceramic tank with a complex structure, characterized in that: The device for precision brazing of a ceramic tank body with a complex structure according to any one of claims 1 to 7 comprises the following steps: Step 1, applying solder to the outer brazing seams on the outer surface of the tank body, the inner brazing seams on the outer surface of the tank body, the outer brazing seams inside the tank body, and the inner brazing seams inside the tank body on the ceramic tank body with a complex structure; Step 2: Pre-position the local induction resistance wire heating chamber on the outer surface of the tank above the outer brazing seam of the outer surface of the tank and the inner brazing seam of the outer surface of the tank through the first induction resistance wire support member, so that the first electromagnetic induction heating resistance wire is located directly above the outer brazing seam of the outer surface of the tank and the inner brazing seam of the outer surface of the tank; The local induction resistance wire heating chamber inside the tank body is pre-placed above the outer ring brazing seam inside the tank body and the inner ring brazing seam inside the tank body through the second induction resistance wire support member, so that the second electromagnetic induction heating resistance wire is located directly above the outer ring brazing seam inside the tank body and the inner ring brazing seam inside the tank body; Step 3: Place the ceramic tank body on the bottom support frame of the ceramic tank body heater; Step 4: Close the thermal insulation cover at the end of the tank body, start the tank body heater first, and heat the ceramic tank body to the preheating temperature; Step 5: Start the electromagnetic induction coil and connect it to a high-power, high-frequency AC power supply. The electromagnetic induction coil generates an alternating magnetic field to generate eddy current heat release on the first electromagnetic induction heating resistance wire and the second electromagnetic induction heating resistance wire, and heat the brazing seam of the outer ring brazing seam of the outer surface of the tank, the brazing seam of the inner ring brazing seam of the outer surface of the tank, the outer ring brazing seam inside the tank, and the brazing seam inside the inner ring brazing seam inside the tank to the welding temperature for brazing.

9. The welding method for a ceramic tank body with a complex structure according to claim 8, characterized in that: The following steps are also included: Step 6: Turn off the tank outer wall heater, the tank inner wall heater and the electromagnetic induction coil, connect them to a high-power high-frequency AC power supply, and cool them down with the furnace.

10. The welding method for a ceramic tank with a complex structure according to claim 8, characterized in that: Step 2: The first electromagnetic induction heating resistance wire is located 0.5-3 cm above the outer ring brazing seam on the outer surface of the tank and the inner ring brazing seam on the outer surface of the tank, and the second electromagnetic induction heating resistance wire is located 0.5-3 cm above the outer ring brazing seam inside the tank and the inner ring brazing seam inside the tank.

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