Microwave heating reactor

Abstract

The invention relates to the technical field of microwave equipment, in particular to a microwave heating reactor which comprises a supporting frame, a furnace body is arranged in the supporting frame, and a furnace cover is connected to the upper end of the furnace body in a sealed mode. The furnace body comprises an outer wall and an inner wall, a resonant cavity is formed by a space in the furnace cover and the inner wall, and a magnetron for emitting microwaves into the resonant cavity is arranged on the furnace body; a gap between the outer wall and the inner wall forms a water cooling cavity, and a water inlet and a water outlet are formed in the outer wall; the water circulating pipe group is connected with the water inlet and the water outlet; the water cooling system is connected with the water circulating pipe group; the main controller is connected with the magnetron and the water cooling system; through the design of the water-cooling cavity between the outer wall and the inner wall, in combination with the water circulating pipe group and the water-cooling system, active rapid cooling is realized, the problem that traditional equipment depends on natural cooling or fan cooling is low in efficiency is effectively solved, the heat dissipation capacity is remarkably improved, it is ensured that the temperature of the equipment is always in a safe range, the service life is prolonged, and safety is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of microwave equipment, and more specifically, to a microwave heating reactor. Background Art

[0002] Microwave heating technology is widely used in fields such as material synthesis, metallurgy, and chemical engineering due to its advantages of high efficiency, rapidity, and selective heating. However, when traditional microwave heating devices are applied to large-volume alloys or irregularly shaped objects, the following technical bottlenecks still exist: Insufficient cooling efficiency: During high-temperature heating, traditional equipment relies on natural cooling or external fan cooling, which is slow and difficult to quickly absorb and disperse the heat generated by the equipment during operation, ensuring that the temperature of the equipment remains within a safe range. It is unsafe to use, and the service life of the equipment is relatively short. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a microwave heating reactor that can ensure that the temperature of the equipment remains within a safe range during use.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows: A microwave heating reactor includes a support frame, a furnace body is arranged in the support frame, and a furnace cover is hermetically connected to the upper end of the furnace body; the furnace body includes an outer wall and an inner wall, and the space between the furnace cover and the inner wall forms a resonant cavity. A magnetron for emitting microwaves into the resonant cavity is arranged on the furnace body; the gap between the outer wall and the inner wall forms a water-cooling cavity, and a water inlet and a water outlet are arranged on the outer wall.

[0005] The present invention adopting the above technical solution, compared with the prior art, its prominent feature is: Through the design of the water-cooling cavity between the outer wall and the inner wall, combined with the water circulation pipe group and the water-cooling system, active and rapid cooling is achieved, effectively solving the problem of low cooling efficiency of traditional equipment relying on natural cooling or fan cooling, significantly improving the heat dissipation capacity, ensuring that the equipment temperature is always within a safe range, extending the service life and enhancing safety.

[0006] As a preference, a further technical solution of the present invention is: Preferably, a thermocouple for detecting the temperature in the resonant cavity is arranged on the furnace body; the thermocouple is connected to the main controller, and the linkage between the thermocouple and the main controller further optimizes the precise temperature control.

[0007] Preferably, it further includes a water circulation pipe group connected to the water inlet and the water outlet, and a water-cooling system connected to the water circulation pipe group; the water circulation pipe group includes a water inlet pipe connected to the water inlet and a water outlet pipe connected to the water outlet; the water-cooling system is a chiller, the water inlet pipe is connected to the water outlet end of the chiller, and the water outlet pipe is connected to the water return end of the chiller; the magnetron and the water-cooling system are connected to the main controller to achieve the cooling of the furnace body.

[0008] Preferably, a plurality of waveguides are circumferentially and spacedly arranged on the furnace body, and the waveguides penetrate through the outer wall and the inner wall; an annular flange is arranged on the inner side of the inner end of the waveguide, a quartz seal is arranged on the annular flange, the outer end of the waveguide is hermetically connected to an excitation cavity, and a magnetron is connected to the excitation cavity.

[0009] Conventional microwave heating devices mostly use single-point or limited-direction microwave feeding, resulting in uneven heating inside large-volume materials, easy to generate local overheating or cold zones, affecting the reaction effect, such as composition segregation during alloy melting; for irregular-shaped articles, such as gears, special-shaped castings, etc., single-point or limited-direction microwave feeding will lead to intensified microwave reflection and standing wave effects, further deteriorating the heating uniformity; this reactor adopts a multi-waveguide structure arranged circumferentially and spacedly, combined with a quartz seal and magnetron feeding, to achieve multi-directional microwave radiation, overcoming the problem of uneven heating caused by traditional single-point feeding; especially suitable for large-volume alloys or irregular workpieces (such as gears, special-shaped castings), reducing local overheating or cold zones, avoiding composition segregation during alloy melting, and improving the reaction effect.

[0010] Preferably, a drain pipe communicating with the inside of the resonant cavity is provided at the bottom of the furnace body, the lower end of the drain pipe is a drain port, and a cover is detachably connected to the drain pipe; a first joint is arranged on the left side of the drain pipe and a second joint is arranged on the right side; a first control valve is arranged on the first joint and a second control valve is arranged on the second joint; the first joint is connected to a vacuum pump through a first atmosphere control pipe, and the second joint is connected to a gas source of special gas through a second atmosphere control pipe; in this embodiment, the vacuum pump adopts a 2XZ-15 rotary vane vacuum pump.

[0011] Ordinary microwave equipment lacks the function of vacuum or inert gas protection, resulting in performance degradation of oxidation-sensitive materials, such as titanium alloys, rare earth metals, etc., during the heating process; moreover, some reactions require strict oxygen isolation, such as the high-temperature synthesis of silicon carbide, etc., and existing equipment needs to be additionally equipped with a complex external gas circuit system, with low integration; this reactor integrates the vacuum / inert gas protection function through the modular design of the vacuum pump and the gas source of special gas, solving the problem of performance degradation of oxidation-sensitive materials (such as titanium alloys, rare earth metals) during the heating process; it can meet the stringent process requirements such as silicon carbide synthesis without an external complex gas circuit system, significantly improving the equipment integration and operation convenience.

[0012] Preferably, a pressure gauge for measuring the air pressure in the resonant cavity is arranged on the furnace cover; it is convenient to monitor the air pressure inside the resonant cavity.

[0013] Preferably, an electric cylinder is provided on the support frame. The output shaft of the electric cylinder is vertically arranged. A connecting sleeve is rotatably connected to the output shaft through a first bearing. A connecting handle is fixedly connected to the connecting sleeve. A connecting plate is arranged at one end of the connecting handle away from the connecting sleeve. The connecting plate is bolted and fixed to the furnace cover; it is convenient for the opening and closing operation of the furnace cover and ensures the sealing performance between the furnace body and the furnace cover.

[0014] Preferably, it further includes a connecting cylinder adapted to the furnace cover. A first flange connecting plate is arranged at the lower edge of the connecting cylinder. A second flange connecting plate adapted to the first flange connecting plate is arranged at the top of the furnace body. The second flange connecting plate connects the outer wall and the inner wall and extends towards the outside of the furnace body; the connecting cylinder and the furnace body are bolted and fixed through the first flange connecting plate and the second flange connecting plate; the connecting cylinder serves as a transition structure between the furnace cover and the furnace body, ensuring the accurate alignment between the furnace cover and the furnace body and enhancing the overall sealing performance; at the same time, the first flange connecting plate and the second flange connecting plate cooperate to form a detachable sealing connection structure, which is convenient for the installation and maintenance of the reactor.

[0015] Preferably, a plurality of connecting seats are circumferentially and spacedly arranged on the outer wall of the connecting cylinder. A guide rod is hinged to each connecting seat. The guide rod is threadedly connected with a handwheel. The lower end of the handwheel is rotatably connected with a pressing sleeve through a second bearing. A clamping tooth is arranged on one side of the pressing sleeve close to the furnace cover. A clamping groove adapted to the clamping tooth is arranged on the furnace cover.

[0016] Preferably, a bracket is arranged at the bottom of the resonant cavity. A heat preservation box is arranged on the bracket; the heat preservation box is formed by splicing a bottom plate, a cover plate and a plurality of unit enclosing plates; by arranging the heat preservation box and placing the material to be heated in the heat preservation box, the ineffective loss of microwave energy can be reduced, making the heat energy more concentrated on the reaction material and improving the heating efficiency. It is especially suitable for processes such as superalloy melting and ceramic sintering that require long-term heat preservation; at the same time, the splicing structure is convenient for local replacement or cleaning, avoiding the problem that the traditional integral heat preservation layer needs to be replaced as a whole due to local damage and reducing the maintenance cost. Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the microwave heating reactor in the embodiment of the present invention; Figure 2 is a schematic structural diagram of the furnace body in the embodiment of the present invention; Figure 3 is a schematic cross-sectional structural diagram of the furnace body in the embodiment of the present invention; Figure 4 is Figure 3 the enlarged structural diagram at A in Figure 5 is Figure 3 the enlarged structural diagram at B in Figure 6 is Figure 3 the enlarged structural diagram at C in; Figure 7 Yes Figure 3 Schematic enlarged structure diagram at position D in the middle; Figure 8 It is a schematic top view structure diagram of the thermocouple in the embodiment of the present invention.

[0018] Description of reference numerals: 1, support frame; 2, furnace body; 201, outer wall; 202, inner wall; 3, furnace cover; 301, card slot; 4, magnetron; 5, water inlet; 6, water circulation pipe group; 7, electric cylinder; 8, connecting sleeve; 9, connecting handle; 10, connecting plate; 11, connecting seat; 12, guide rod; 13, hand wheel; 14, crimping sleeve; 1401, locking teeth; 15, connecting cylinder; 16, first flange connecting plate; 17, second flange connecting plate; 18, universal wheel; 19, connecting support leg; 20, base; 21, pressure gauge; 22, waveguide; 23, excitation cavity; 2301, connecting end cover; 2302, connecting end plate; 24, water outlet; 25, bracket; 26, bottom plate; 27, cover plate; 28, unit enclosure; 29, quartz seal; 30, first sealing ring; 31, second sealing ring; 32, sewage pipe; 33, first joint; 34, second joint; 35, sealing cover; 36, third sealing ring; 37, fourth sealing ring; 38, socket; 39, thermocouple. Detailed implementation manners

[0019] The present invention will be further described below in conjunction with specific embodiments, and the purpose is only to better understand the content of the present invention. Therefore, the examples given do not limit the protection scope of the present invention.

[0020] Such as Figures 1 to 3As shown in the figure, this embodiment provides a microwave heating reactor, which includes a support frame 1. A furnace body 2 is arranged in the support frame 1, and a furnace cover 3 is hermetically connected to the upper end of the furnace body 2. The furnace body 2 includes an outer wall 201 and an inner wall 202. The space between the furnace cover 3 and the inner wall 202 forms a resonant cavity. A magnetron 4 for emitting microwaves into the resonant cavity is arranged on the furnace body 2. The gap between the outer wall 201 and the inner wall 202 forms a water-cooling cavity, and a water inlet 5 and a water outlet 24 are arranged on the outer wall 201. It also includes a water circulation pipe group 6 connected to the water inlet 5 and the water outlet 24, a water-cooling system connected to the water circulation pipe group 6, and a main controller connected to the magnetron 4 and the water-cooling system. In this embodiment, the magnetron 4 is a Panasonic MG12W-M1U3C type magnetron (frequency 2460 MHz ± 50 MHz, continuously adjustable power 0 - 1250 W), and the single-tube life ≥ 8000 hours. The water circulation pipe group 6 includes a water inlet pipe connected to the water inlet 5 and a water outlet pipe connected to the water outlet 24. The water-cooling system is a water chiller. The water inlet pipe is connected to the water outlet end of the water chiller, and the water outlet pipe is connected to the water return end of the water chiller. Among them, the water chiller is a prior art. For example, it can be a water-cooled water chiller, which includes a compressor, a condenser, a cooling water tower, an expansion valve, an evaporator, a water tank, a water pump, etc. At the beginning, the compressor sucks in the low-temperature and low-pressure refrigerant gas after evaporation and refrigeration, and then compresses it into a high-temperature and high-pressure gas and sends it to the condenser; the high-temperature and high-pressure gas is cooled by the condenser to condense the gas into a normal-temperature and high-pressure liquid; when the normal-temperature and high-pressure liquid flows into the thermal expansion valve, it is throttled into a low-temperature and low-pressure wet steam and flows into the shell-and-tube evaporator, absorbing the heat of the chilled water in the evaporator to lower the water temperature; the evaporated refrigerant is sucked back into the compressor again, and the next refrigeration cycle is repeated.

[0021] Through the design of the water-cooling cavity between the outer wall 201 and the inner wall 202, combined with the water circulation pipe group 6 and the water-cooling system, active rapid cooling is achieved, effectively solving the problem that traditional equipment relies on natural cooling or fan cooling with low efficiency, significantly improving the heat dissipation capacity, ensuring that the equipment temperature is always within a safe range, extending the service life and enhancing safety.

[0022] As Figure 8 shown in the figure, a thermocouple 39 for detecting the temperature in the resonant cavity is arranged on the furnace body 2, and the thermocouple 39 is connected to the main controller; specifically, a socket 38 is arranged on the furnace body 2, a fourth sealing ring 37 is arranged in the socket 38, the thermocouple 39 is inserted into the socket 38, and is hermetically connected to the socket 38 through the fourth sealing ring 37.

[0023] As Figure 3 、 Figure 4As shown in the figure, a number of waveguides 22 are circumferentially and spacedly arranged on the furnace body 2. The waveguides 22 penetrate through the outer wall 201 and the inner wall 202. An annular flange is arranged on the inner side of the inner end of the waveguide 22, and a quartz seal 29 is arranged on the annular flange. The side cross-section of the quartz seal 29 is of a U-shaped structure. In this embodiment, the quartz seal is made of high-purity fused quartz (SiO2≥99.99%). The wall thickness of the U-shaped structure is 3 mm, and the temperature resistance is ≥1200°C. The quartz seal 29 has the dual functions of sealing and wave transmission. The quartz window allows microwave energy to enter the cavity. At the same time, the dense structure of quartz can effectively isolate the penetration of gas and liquid, and maintain the vacuum or specific atmosphere (such as inert gas) of the reaction cavity. The outer end of the waveguide 22 is hermetically connected to an excitation cavity 23. One end of the excitation cavity 23 is provided with a connection end cover 2301, and the other end is provided with a connection end plate 2302. The excitation cavity 23 is bolted and fixed to the outer end of the waveguide 22 through the connection end cover 2301. A first groove is also provided at the outer end of the waveguide 22, and a first sealing ring 30 is arranged in the first groove. A crimping portion is arranged on the connection end cover 2301 and crimped on the first sealing ring 30 to ensure the sealed connection between the connection end cover 2301 and the outer end of the waveguide 22. The excitation cavity 23 is connected to a magnetron 4 through the connection end plate 2302. In this embodiment, as Figure 2 .

[0024] This reactor adopts a circumferentially uniform distribution design of multiple magnetrons 4. A number of magnetrons 4 are circumferentially and evenly distributed on the outer side wall of the heating cavity to achieve three-dimensional uniform microwave radiation and solve the problem of uneven heating of large-volume or irregular items. Conventional microwave heating devices mostly adopt single-point or limited-direction microwave feeding, resulting in uneven heating inside large-volume materials, easy to generate local overheating or cold zones, and affecting the reaction effect. For example, component segregation occurs during alloy melting. For irregularly shaped items, such as gears and special-shaped castings, single-point or limited-direction microwave feeding will lead to aggravated microwave reflection and standing wave effects, further deteriorating the heating uniformity. This reactor adopts a structure of multiple waveguides 22 arranged at circumferential intervals, combined with the feeding of the quartz seal 29 and the magnetron 4, to achieve multi-directional microwave radiation, overcoming the problem of uneven heating caused by traditional single-point feeding. It is especially suitable for large-volume alloys or irregular workpieces (such as gears and special-shaped castings), reducing local overheating or cold zones, avoiding component segregation during alloy melting, and improving the reaction effect.

[0025] Such as Figure 3 , Figure 6As shown in the figure, a drain pipe 32 communicating with the inside of the resonant cavity is provided at the bottom of the furnace body 2. The lower end of the drain pipe 32 is a drain opening, and a cover 35 is detachably connected to the drain pipe 32. After removing the cover 35, the reaction residues can be discharged through the drain pipe 32. A first joint 33 is provided on the left side of the drain pipe 32, and a second joint 34 is provided on the right side. A first control valve is provided on the first joint 33. The first control valve is a one-way valve. A second control valve is provided on the second joint 34. The first joint 33 is connected to a vacuum pump through a first atmosphere control pipe, and the second joint 34 is connected to a gas source of a special gas through a second atmosphere control pipe.

[0026] When evacuating, close the second control valve of the drain pipe 32, open the first control valve and the vacuum pump, and monitor the vacuum degree in the resonant cavity to the target value (such as 10⁻³ Pa) through the pressure gauge 21.

[0027] When filling with inert gas, close the first control valve, open the second control valve and the inert gas pump, and fill the resonant cavity with inert gas to normal pressure or slightly positive pressure (0.1 - 0.2 MPa).

[0028] Ordinary microwave equipment lacks the functions of vacuum or inert gas protection, resulting in the performance degradation of oxidation-sensitive materials, such as titanium alloys, rare earth metals, etc. during the heating process. Moreover, for some reactions that require strict oxygen isolation, such as the high-temperature synthesis of silicon carbide, etc., existing equipment needs to be additionally equipped with a complex external gas circuit system with low integration. This reactor, through the modular design of the vacuum pump and the gas source of the special gas, integrates the vacuum / inert gas protection function, solves the problem of performance degradation of oxidation-sensitive materials (such as titanium alloys, rare earth metals) during the heating process, and can meet the stringent process requirements such as silicon carbide synthesis without an external complex gas circuit system, significantly improving the equipment integration and operation convenience.

[0029] Such as Figure 1 , a pressure gauge 21 for measuring the air pressure in the resonant cavity is provided on the furnace cover 3, which is convenient for monitoring the internal air pressure of the resonant cavity.

[0030] Such as Figure 1 , an electric cylinder 7 is provided on the support frame 1. The output shaft of the electric cylinder 7 is vertically arranged. A connecting sleeve 8 is rotatably connected to the output shaft through a first bearing. A connecting handle 9 is fixedly connected to the connecting sleeve 8. One end of the connecting handle 9 far from the connecting sleeve 8 is provided with a connecting plate 10, and the connecting plate 10 is bolted and fixed to the furnace cover 3, which is convenient for the opening and closing operation of the furnace cover 3 and ensures the sealing performance between the furnace body 2 and the furnace cover 3.

[0031] Such as Figure 2 , Figure 7As shown, it further includes a connecting cylinder 15 adapted to the furnace cover 3. A first flange connecting plate 16 is provided at the lower edge of the connecting cylinder 15, and a second flange connecting plate 17 adapted to the first flange connecting plate 16 is provided at the top of the furnace body 2. The second flange connecting plate 17 connects the outer wall 201 and the inner wall 202 and extends outward from the furnace body 2. The connecting cylinder 15 and the furnace body 2 are bolted and fixed through the first flange connecting plate 16 and the second flange connecting plate 17. The connecting cylinder 15 serves as a transition structure between the furnace cover 3 and the furnace body 2 to ensure the precise alignment of the furnace cover 3 and the furnace body 2 and enhance the overall sealing performance. At the same time, a third groove is provided on the second flange connecting plate 17, and a third sealing ring 36 is arranged in the third groove. The first flange connecting plate 16, the second flange connecting plate 17, and the third sealing ring 36 form a detachable sealing connection structure, which is convenient for the installation and maintenance of the reactor.

[0032] As Figure 3 , Figure 5 shown, a plurality of connecting seats 11 are circumferentially and spacedly arranged on the outer wall 201 of the connecting cylinder 15. A guide rod 12 is hinged on each connecting seat 11. The guide rod 12 is threadedly connected with a hand wheel 13. The lower end of the hand wheel 13 is rotatably connected with a pressing sleeve 14 through a second bearing. A clamping tooth 1401 is arranged on one side of the pressing sleeve 14 close to the furnace cover 3, and a clamping groove 301 adapted to the clamping tooth 1401 is arranged on the furnace cover 3. In this embodiment, as Figure 5 shown, a Z-shaped connecting part is provided at the upper edge of the connecting cylinder 15, and a Z-shaped overlapping part adapted to the Z-shaped connecting part is provided at the edge of the furnace cover 3. One end of the Z-shaped overlapping part close to the furnace cover 3 is provided with a baffle extending downward. A second groove is provided on the Z-shaped connecting part, and a second sealing ring 31 is arranged in the second groove. Through the baffle and the second sealing ring 31, the sealing performance of the resonant cavity is further enhanced. Among them, the second bearing is a thrust bearing, which is convenient for turning the hand wheel 13.

[0033] During charging, the furnace cover 3 is lifted by the electric cylinder 7 and then rotated to open the furnace cover 3. The material to be processed (such as aluminum alloy ingot) is placed in the heat preservation box of the bracket 25, and the splicing cover plate 27 and the unit enclosing plate 28 are spliced to form a closed heat preservation environment. Then the furnace cover 3 is rotated again, and the electric cylinder 7 drives the furnace cover 3 to descend to close the furnace body 2. The guide rod 12 is rotated to make the hand wheel 13 face upward, and the hand wheel 13 is rotated to make the clamping tooth 1401 engage in the clamping groove 301 to lock the furnace cover 3, preventing the internal pressure of the resonant cavity from rising after the heating reaction and jacking up the furnace cover 3. At the same time, the sealing performance inside the resonant cavity is further ensured.

[0034] A bracket 25 is provided at the bottom of the resonant cavity, and a heat preservation box is arranged on the bracket 25; the heat preservation box is formed by splicing a bottom plate 26, a cover plate 27 and a number of unit enclosing plates 28; by setting the heat preservation box, the material to be heated is placed in the heat preservation box, which can reduce the ineffective loss of microwave energy, make the heat energy more concentrated on the reaction material, improve the heating efficiency, and is especially suitable for processes that require long-term heat preservation such as superalloy melting and ceramic sintering; at the same time, the splicing structure is convenient for local replacement or cleaning, avoiding the problem that the traditional integral heat preservation layer needs to be replaced as a whole due to local damage, and reducing the maintenance cost.

[0035] During use, the power of the magnetron 4 (such as 1 kW), the target temperature (such as 600 °C) and the heat preservation time (such as 30 min) are preset through the main controller; during microwave heating, the magnetron 4 is started, and the microwave is fed into the resonant cavity through the waveguide 22 and the quartz seal 29, and the thermocouple 39 real-time feeds back the temperature data, and the main controller dynamically adjusts the power to maintain the temperature uniformity (the temperature difference is within ±12 °C); during the heating process, it is necessary to pay attention to monitoring, observing the pressure gauge 21 and the thermocouple 39, and immediately stop the machine in case of abnormality. When high-temperature heating is involved, the chiller needs to be turned on to cool the furnace body 2 to protect the components and prevent the furnace body 2 from overheating. When discharging, the furnace cover 3 is opened, the processed material is taken out, and the residues in the resonant cavity are cleaned.

[0036] The experimental data of this reactor (the magnetron is arranged circumferentially at 3×4×1.5 kW) and the traditional single-magnetron 4 microwave oven (6 kW) are shown in Table 1. Among them, the test sample uses a ZL205A aluminum alloy ingot (Ø200 mm×300 mm, mass 25 kg).

[0037] Performance indicators Traditional equipment This embodiment Improvement effect Temperature uniformity Surface temperature difference ±85°C Surface temperature difference ±12°C Improved by 85% Melting time 42 min 28 min Shortened by 33% Energy consumption 18.6 kWh 14.2 kWh Reduced by 24% Composition segregation (Cu) Difference between center and edge: 4.2 wt% Difference between center and edge: 0.8 wt% Segregation reduced by 81% Oxide layer thickness 120 - 150 μm <20 μm (Ar protection) Significant oxidation inhibition effect Table 1 Traditional single-magnetron 4 microwave oven: single-point microwave feeding leads to a significant temperature gradient, overheating at the edge (the highest 620 °C), lagging temperature rise at the center (the lowest 535 °C), and the surface temperature difference reaches ±85 °C. The fluidity of the alloy melt is poor, and the Cu element is enriched at the edge (EDS shows that the Cu content at the edge is 6.3 wt%, and only 2.1 wt% at the center). This reactor: the circumferential radiation of multiple magnetrons 4 makes the temperature distribution uniform, and the surface temperature difference is controlled within ±12 °C (the center is 602 °C±5 °C, the edge is 610 °C±7 °C); the Cu segregation is greatly improved (the difference in content between the edge and the center is reduced from 4.2 wt% to 0.8 wt%). Therefore, the plum-blossom-shaped waveguide 22 layout effectively suppresses the standing wave effect and realizes three-dimensional uniform heating.

[0038] Compared with the prior art, this reactor is suitable for the heating requirements of large-volume or irregular items, and the reaction heating requirements that require vacuum or inert gas; through structural optimization and function integration, the applicability of microwave heating technology in special materials and complex processes is significantly improved.

[0039] Meanwhile, for the convenience of moving the reactor main body, universal wheels 18 are provided at the bottom of the support frame 1, and connecting support feet 19 are provided at the four corners. The lower ends of the connecting support feet 19 are threadedly connected with bases 20. During use, by rotating the bases 20, the lower edges of the universal wheels 18 are made lower than the lower edges of the bases 20, and then the support frame 1 can be moved through the universal wheels 18. After moving to the specified position, rotate the bases 20 to make them suspended, so that the whole reactor is located at the specified position and no longer moves.

[0040] The above are only the preferred embodiments of the present invention, and do not limit the scope of the rights of the present invention. Any equivalent changes made by using the content of the specification and drawings of the present invention are included in the scope of the rights of the present invention.

Claims

1. A microwave heating reactor, characterized in that: The invention comprises a support frame (1), a furnace body (2) is arranged in the support frame (1), and a furnace cover (3) is sealedly connected to the upper end of the furnace body (2); the furnace body (2) comprises an outer wall (201) and an inner wall (202), the space between the furnace cover (3) and the inner wall (202) constitutes a resonance cavity, and a magnetron (4) for emitting microwaves into the resonance cavity is arranged on the furnace body (2); the gap between the outer wall (201) and the inner wall (202) constitutes a water cooling cavity, and a water inlet (5) and a water outlet (24) are arranged on the outer wall (201).

2. The microwave heating reactor according to claim 1, characterized in that: A thermocouple (39) for detecting the temperature in the resonance cavity is arranged on the furnace body (2).

3. The microwave heating reactor according to claim 1, characterized in that: It also includes a water circulation pipe group (6) connected to the water inlet (5) and the water outlet (24), and a water cooling system connected to the water circulation pipe group (6); the water circulation pipe group (6) includes a water inlet pipe connected to the water inlet (5) and a water outlet pipe connected to the water outlet (24); the water cooling system is a chiller, the water inlet pipe is connected to the water outlet end of the chiller, and the water outlet pipe is connected to the return water end of the chiller.

4. The microwave heating reactor according to claim 1, characterized in that: A plurality of waveguide tubes (22) are arranged at intervals in the annular direction on the furnace body (2), and the waveguide tubes (22) are arranged to pass through the outer wall (201) and the inner wall (202); an annular flange is arranged on the inner side of the inner end of the waveguide tube (22), and a quartz sealing member (29) is arranged on the annular flange; the outer end of the waveguide tube (22) is sealedly connected to an excitation cavity (23), and the excitation cavity (23) is connected to a magnetron (4).

5. The microwave heating reactor according to claim 1, characterized in that: A sewage pipe (32) connected to the inside of the resonant cavity is provided at the bottom of the furnace body (2); the lower end of the sewage pipe (32) is a sewage outlet; a sealing cover (35) is detachably connected to the sewage pipe (32); a first joint (33) is provided on the left side of the sewage pipe (32), and a second joint (34) is provided on the right side; a first control valve is provided on the first joint (33), and a second control valve is provided on the second joint (34); the first joint (33) is connected to a vacuum pump via a first atmosphere control pipe, and the second joint (34) is connected to a gas source of a special gas via a second atmosphere control pipe.

6. The microwave heating reactor according to claim 5, characterized in that: A barometer (21) for measuring the air pressure in the resonance cavity is arranged on the furnace cover (3).

7. The microwave heating reactor according to claim 1, characterized in that: An electric cylinder (7) is arranged on the support frame (1), the output shaft of the electric cylinder (7) is arranged vertically, a connecting sleeve (8) is rotatably connected to the output shaft via a first bearing, a connecting handle (9) is fixedly connected to the connecting sleeve (8), a connecting plate is arranged at one end of the connecting handle (9) away from the connecting sleeve (8), and the connecting plate is bolted and fixed to the furnace cover (3).

8. The microwave heating reactor according to claim 1, characterized in that: It also comprises a connecting tube (15) adapted to the furnace cover (3); a first flange connecting plate (16) is arranged at the lower edge of the connecting tube (15); a second flange connecting plate (17) adapted to the first flange connecting plate (16) is arranged at the top of the furnace body (2); the second flange connecting plate (17) connects the outer wall (201) and the inner wall (202) and extends toward the outside of the furnace body (2); the connecting tube (15) and the furnace body (2) are bolted and fixed via the first flange connecting plate (16) and the second flange connecting plate (17).

9. The microwave heating reactor according to claim 8, characterized in that: A plurality of connection seats (11) are arranged at intervals in the annular direction on the outer wall (201) of the connection cylinder (15); a guide rod (12) is hingedly connected to each connection seat (11); a hand wheel (13) is threadedly connected to the guide rod (12); a crimping sleeve (14) is rotatably connected to the lower end of the hand wheel (13) via a second bearing; a latching tooth (1401) is arranged on the side of the crimping sleeve (14) close to the furnace cover (3); and a latching groove (301) that cooperates with the latching tooth (1401) is arranged on the furnace cover (3).

10. The microwave heating reactor according to claim 1, characterized in that: A bracket (25) is arranged at the bottom of the resonance cavity, and a heat preservation box is arranged on the bracket (25); the heat preservation box is formed by splicing a bottom plate (26), a cover plate (27) and a plurality of unit enclosure plates (28).

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