Precise brazing device for ceramic tank with complex structure and welding method of precise brazing device

Abstract

The invention discloses a precise brazing device and method for a ceramic tank with a complex structure and relates to the field of ceramic brazing, and the brazing device comprises a tank body heater, a local induction resistance wire heating bin on the outer surface of the tank and a local induction resistance wire heating bin in the tank. The tank body heater comprises an electromagnetic induction coil; the local induction resistance wire heating bin on the outer surface of the tank body comprises a first electromagnetic induction heating resistance wire, and the local induction resistance wire heating bin in the tank body comprises a second electromagnetic induction heating resistance wire. A high-power high-frequency alternating-current power supply is adopted to generate an alternating magnetic field in an electromagnetic induction coil, eddy heat release is generated on an electromagnetic induction heating resistance wire, brazing filler metal in a brazing seam in a tank body is heated to the welding temperature for brazing, and rapid forming of the brazing seam in a complex ceramic structure device is achieved. And a plurality of heaters are adopted, accurate control over the temperatures of different areas is achieved, the temperature gradient is reduced, and cracking is prevented.

Description

Technical Field

[0001] The 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] Ceramic materials are increasingly selected as manufacturing materials for high-end devices due to their excellent physical and chemical properties, playing an important role in the fields of energy, chemical industry, machinery, etc. With the development of the times and the advancement of science and technology, the structures of devices with specific functions are becoming more and more complex, and advanced connection technologies are urgently needed to achieve precision manufacturing of complex structure devices. However, ceramics are brittle materials with poor machinability, making it difficult to directly manufacture them using conventional machining methods. At this time, welding technology becomes the only choice for the manufacture of these complex structure ceramic devices.

[0003] Traditional ceramic brazing technology uses brazing filler to fill the gap between the ceramic device structure, and then melts the brazing filler through high temperature heating in a heating furnace, and uses the wetting phenomenon between the brazing filler and the surface of the ceramic device to make the brazing filler and the ceramic form a whole. When the heating of the ceramic device stops, the temperature of the brazing filler on the device structure will decrease, and the brazing filler will solidify to connect the brazed joints together, completing the welding and manufacturing of the device structure. However, some functional devices cannot be heated as a whole, such as a ceramic tank with electronic devices. The high temperature of brazing will destroy the physical properties of the electronic devices inside the tank, 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 weld on the surface of the ceramic device, melt the brazing filler in the weld and then solidify it to achieve the connection of the weld, but when the weld is located inside the ceramic device and the external heating light source cannot directly radiate the brazing position, this light heat source local radiation method cannot achieve the connection of the shielded internal weld.

[0004] In summary, neither the traditional overall heating brazing method nor the recently emerged local heating method of light-heat source radiation can meet the precision welding and manufacturing of such complex structure ceramic components, nor can it locally heat the welds in the position that cannot be directly exposed to light while maintaining the overall low temperature of the ceramic components, so as to achieve the precision manufacturing of complex structure ceramic components. The above problems limit the application of ceramic materials in the manufacturing of high-end equipment precision parts.

[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 increase in the overall temperature 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, thus 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 local positions of the welds of complex structure components, form a brazing connection of the weld joint by melting and solidifying the brazing material in the weld, and control the overall heat input of the weld by rapid heating and rapid cooling to prevent the temperature of the components inside the weld from being too high; (2) How to perform local heating on positions that are not directly exposed to light to achieve a 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 to prevent the ceramic components from cracking during the heating and cooling processes of brazing.

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

[0008] The tank body heater comprises a tank body preheater housing, an electromagnetic induction coil and a high-power high-frequency AC power source externally connected to the electromagnetic induction coil, wherein 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 source externally connected to the electromagnetic induction coil are connected via wires;

[0009] The local induction resistance wire heating chamber on 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 on the outer surface of the tank through 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 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 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 insulator.

[0013] Furthermore, the local induction resistance wire heating chamber on the outer surface of the tank body further comprises 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 body.

[0014] Furthermore, 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.

[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 tank end insulation cover is connected to the upper end of the tank body preheater shell through a groove, and the tank end insulation cover 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 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.

[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-place the local induction resistance wire heating chamber on the outer surface of the tank body above the outer ring brazing seam on the outer surface of the tank body and the inner ring brazing seam on the outer surface of the tank body through the first induction resistance wire support member, so that the first electromagnetic induction heating resistance wire is located directly above the outer ring brazing seam on the outer surface of the tank body and the inner ring brazing seam on the outer surface of the tank body;

[0022] Pre-place the local induction resistance wire heating chamber inside the tank body 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, placing the ceramic tank body on the bottom support frame in the ceramic tank body heater;

[0024] Step 4, closing the heat preservation cover at the end of the tank body, first starting the tank body heater, and heating the ceramic tank body to the preheating temperature;

[0025] Step 5, start the electromagnetic induction coil externally connected to a high-power high-frequency AC power supply, generate an alternating magnetic field through the electromagnetic induction coil to generate eddy current heat release on the first electromagnetic induction heating resistance wire and the second electromagnetic induction heating resistance wire, heat the brazing seam of the outer ring brazing seam of the outer surface of the tank body, the brazing seam of the inner ring brazing seam of the outer surface of the tank body, the outer ring brazing seam inside the tank body, and the brazing material in the inner ring brazing seam inside the tank body 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 an external high-power high-frequency AC power source, and cool them along 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 brazing seam of the inner 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, so as to generate an alternating magnetic field in the space of the ceramic tank body, generate eddy current heating on the first induction resistance wire and the second induction resistance wire preset in the tank body, and then indirectly heat the weld at the preset resistance wire position 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 metals so that they can 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 preset 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 preset induction resistance wire can be heated. And since the electromagnetic field can penetrate the outer wall of the ceramic tank body, the preset resistance wire inside the tank body can be accurately heated, which solves the limitation that infrared light heating can only heat the illuminated position, and finally can efficiently realize the forming of the internal brazing seam of complex ceramic structure devices. And by presetting local induction resistance wire heating chambers at multiple positions of complex ceramic structure devices, 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 up too much. 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) temperature. However, overall heating will cause damage to high-temperature-sensitive electrical components in the cavity. This requires that local heating is required for the welding of such parts, 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 achieves 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 body, and a local induction resistor wire heating chamber inside the tank body).

[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 of large temperature gradients. The external heater (the tank body heater) can achieve the brazing preheating effect and the post-welding slow cooling effect, reduce the temperature gradient of the ceramic, and avoid cracking. In addition, the local induction resistance wire heating chamber is equipped with an 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 body precision integrated brazing welding device according to a preferred embodiment of the present invention;

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

[0036] Figure 3It 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 upper inner half electronic device installation area, 13-internal ceramic insulation Plate, 14-electronic device installation area in the lower half of the tank body, 15-arc-shaped insulator, 16-first induction resistance wire support, 17-first electromagnetic induction heating resistance wire, 18-tank body outer surface brazing seam temperature sensor, 19-tank body outer surface outer ring brazing seam, 20-heating chamber partition, 21-tank body outer surface inner ring brazing seam, 22-internal arc-shaped insulator, 23-tank body inner brazing seam temperature sensor, 24-second electromagnetic induction heating resistance wire, 25-second induction resistance wire support, 26-tank body inner outer ring brazing seam, 27-tank body inner ring brazing seam. DETAILED DESCRIPTION

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

[0039] In the drawings, components with the same structure are indicated by the same numerical reference numerals, and components with similar structures or functions are indicated by similar numerical reference numerals. The size and thickness of each component shown in the drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component. In order to make the illustration clearer, the thickness of the components is appropriately exaggerated in some places in the drawings.

[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. Among them, the tank body end insulation cover 1 is connected to the upper end of the tank body preheater shell 2 through a groove, the tank body end insulation cover 1 is set to be open and close, the bottom support frame 6 is set inside the tank body preheater shell 2, and is connected to the tank body bottom insulation board 9 through a groove, the tank body outer wall heater 3 is set near the inner wall of the tank body preheater shell 2, the tank body inner wall heater 7 is set 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 through a groove, and the electromagnetic induction coil 4 is set at a distance of 5 cm 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 through 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 installation area 12 in the upper half of the tank body, an internal ceramic partition 13, and an electronic device installation 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 240 mm, an outer wall diameter of 300 mm, a wall thickness of 2 mm, and a height of 200 mm. The interior of the ceramic tank is divided into two internal compartments to place electronic devices. Therefore, there is a need for brazing both outside and inside the ceramic tank, specifically, the outer ring brazing seam 19 on the outer surface of the tank body, the inner ring brazing seam 21 on the outer surface of the tank body, the outer ring brazing seam 26 inside the tank body, and the inner ring brazing seam 27 inside the tank body.

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

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

[0049] (1) Clean the surfaces near the inner and outer walls of the ceramic tank body 5 to remove impurities and grease. Use a 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 ceramic tank body 5, 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, 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 on the outer surface of the tank is pre-placed above the outer ring brazing seam 19 on the outer surface of the tank and the inner ring brazing seam 21 on 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 on the outer surface of the tank and the inner ring brazing seam 21 on the outer surface of the tank.

[0052] The second induction resistance wire support 25 in the local induction resistance wire heating chamber II inside the tank body is pre-placed above the outer brazing seam 26 inside the tank body and the inner brazing seam 27 inside the tank body, so that the second electromagnetic induction heating resistance wire 24 is located 0.5-3 cm away from the outer brazing seam 26 inside the tank body and the inner brazing seam 27 inside the tank body. The entire local induction resistance wire heating chamber II inside the tank body does not need to be removed from the ceramic tank body after brazing, and the local induction resistance wire heating chamber I on the outer surface of the tank body 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 resistor 24 inside the cavity. After the second electromagnetic induction heating resistor 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 by a magnetic induction heating coil and then the coil. For welds that are in a position where the light source cannot radiate directly, it is impossible to perform radiation heating by 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 local induction resistance heating chamber Ⅰ on the outer surface of the tank body and the local induction resistance heating chamber Ⅱ inside the tank body 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, the tank body heater III and the tank body heater 7 are started to heat the ceramic tank body 5 to the 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 on the outer surface of the tank, the inner ring brazing seam 21 on the outer surface of the tank, the outer ring brazing seam 26 inside the tank, and the inner ring brazing seam 27 inside the tank 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 seam in real time. This achieves accurate 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 complex ceramic tank body precision welding device and its use in the process of complex ceramic tank body precision welding of the present invention. The electromagnetic induction coil 4 generates an alternating magnetic field, and the local induction resistance wire heating chamber I and the local induction resistance wire heating chamber II pre-set on the outer surface of the tank body inside the ceramic tank body 5 can be quickly heated in the high-frequency alternating magnetic field, and the solder in the weld is heated and melted by radiation heat release, so that the weld temperature reaches the higher temperature required for brazing, thereby realizing the welding and brazing process inside the complex ceramic tank body. The electronic devices in the upper half of the tank body electronic device installation area 12 and the lower half of the tank body electronic device installation area 14 inside the ceramic tank body 5 can be kept below 400°C to prevent the electronic devices from being damaged by high temperature. And the tank body 5 is preheated by the tank body outer wall heater 3 and the tank body inner wall heater 7 of the tank body heater III, and the tank body outer wall heater 3 and the tank body inner wall heater 7 keep the ceramic tank body at a relatively high temperature (such as 350°C) during the entire brazing process, reducing the temperature gradient during the brazing process and avoiding the ceramic tank body from cracking due to thermal stress.

[0059] The preferred specific embodiments of the present invention are described in detail above. It should be understood that ordinary technicians in the field can make many modifications and changes based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by technicians in the technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the scope of protection determined 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 comprises a tank body preheater housing, an electromagnetic induction coil and a high-power high-frequency AC power source externally connected to the electromagnetic induction coil, wherein 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 source externally connected to the electromagnetic induction coil are connected via wires; The local induction resistance wire heating chamber on 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 on the outer surface of the tank through 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 also includes a bottom support frame, which is arranged inside the tank body preheater shell and connected to the bottom of the inner wall of the tank body preheater shell through 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 further comprises 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 as claimed in claim 3 is characterized in that: The local induction resistance wire heating chamber on the outer surface of the tank further comprises 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 as claimed in claim 2 is 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 tank end insulation cover is connected to the upper end of the tank body preheater shell through a groove, and the tank end insulation cover 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 complex structure ceramic tank precision brazing device as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: 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; Step 2: pre-place the local induction resistance wire heating chamber on the outer surface of the tank body above the outer ring brazing seam on the outer surface of the tank body and the inner ring brazing seam on the outer surface of the tank body through the first induction resistance wire support member, so that the first electromagnetic induction heating resistance wire is located directly above the outer ring brazing seam on the outer surface of the tank body and the inner ring brazing seam on the outer surface of the tank body; Pre-place the local induction resistance wire heating chamber inside the tank body 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, placing the ceramic tank body on the bottom support frame in the ceramic tank body heater; Step 4, closing the heat preservation cover at the end of the tank body, first starting the tank body heater, and heating the ceramic tank body to the preheating temperature; Step 5, start the electromagnetic induction coil externally connected to a high-power high-frequency AC power supply, generate an alternating magnetic field through the electromagnetic induction coil to generate eddy current heat release on the first electromagnetic induction heating resistance wire and the second electromagnetic induction heating resistance wire, heat the brazing seam of the outer ring brazing seam of the outer surface of the tank body, the brazing seam of the inner ring brazing seam of the outer surface of the tank body, the outer ring brazing seam inside the tank body, and the brazing material in the inner ring brazing seam inside the tank body to the welding temperature for brazing.

9. The welding method of the complex structure ceramic tank precision brazing device 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 an external high-power high-frequency AC power source, and cool them along with the furnace.

10. The welding method of the complex structure ceramic tank precision brazing device 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 circle brazing seam on the outer surface of the tank body and the inner circle brazing seam on the outer surface of the tank body, and the second electromagnetic induction heating resistance wire is located 0.5-3 cm above the outer circle brazing seam inside the tank body and the inner circle brazing seam inside the tank body.

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