Microwave heating reactor

Abstract

The utility model 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 the upper end of the furnace body is connected with a furnace cover in a sealing 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] This utility model relates to the field of microwave equipment technology, specifically a microwave heating reactor. Background Technology

[0002] Microwave heating technology is widely used in materials synthesis, metallurgy, chemical industry and other fields due to its advantages such as high efficiency, speed and selective heating. However, traditional microwave heating devices still have the following technical bottlenecks when applied to large-volume alloys or irregularly shaped objects: Insufficient cooling efficiency: When heating at high temperatures, traditional equipment relies on natural cooling or external fan cooling, which is slow and makes it difficult to quickly absorb and disperse the heat generated by the equipment during operation to ensure that the temperature of the equipment is kept within a safe range. This makes the equipment unsafe to use and results in a short service life. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a microwave heating reactor that can ensure that the temperature of the equipment is maintained within a safe range during use.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A microwave heating reactor includes a support frame, a furnace body is disposed in the support frame, and a furnace cover is sealed to the upper end of the furnace body; the furnace body includes an outer wall and an inner wall, the space between the furnace cover and the inner wall forms a resonant cavity, and a magnetron is disposed on the furnace body to emit microwaves into the resonant cavity; the gap between the outer wall and the inner wall forms a water-cooling cavity, and an inlet and an outlet are disposed on the outer wall.

[0006] Compared with the prior art, the present utility model adopting the above technical solution has the following outstanding features:

[0007] By designing a water-cooled cavity between the outer and inner walls, combined with a water circulation pipe assembly and water cooling system, active rapid cooling is achieved, effectively solving the problem of low efficiency in traditional equipment that relies on natural cooling or fan cooling. This significantly improves heat dissipation capacity, ensures that the equipment temperature is always within a safe range, extends service life, and enhances safety.

[0008] As a preferred embodiment, a further technical solution of this utility model is:

[0009] Preferably, a thermocouple for detecting the temperature inside the resonant cavity is installed 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.

[0010] Preferably, it also includes a water circulation pipe assembly connected to the inlet and outlet, and a water cooling system connected to the water circulation pipe assembly; the water circulation pipe assembly includes an inlet pipe connected to the inlet and an outlet pipe connected to the outlet; the water cooling system is a chiller unit, with the inlet pipe connected to the outlet end of the chiller unit and the outlet pipe connected to the return end of the chiller unit; the magnetron and the water cooling system are connected to the main controller to achieve furnace cooling.

[0011] Preferably, a number of waveguides are arranged circumferentially on the furnace body, and the waveguides penetrate the outer wall and the inner wall; an annular flange is provided on the inner side of the inner end of the waveguide, and a quartz seal is provided on the annular flange; the outer end of the waveguide is sealed and connected to an excitation cavity, and a magnetron is connected to the excitation cavity.

[0012] Conventional microwave heating devices often employ single-point or limited-directional microwave feeding, leading to uneven heating of large-volume materials and the formation of localized overheating or cold zones, thus affecting reaction efficiency, such as component segregation during alloy melting. For irregularly shaped items, such as gears and irregularly shaped castings, single-point or limited-directional microwave feeding exacerbates microwave reflection and standing wave effects, further deteriorating heating uniformity. This reactor utilizes a circumferentially spaced multi-waveguide structure, combined with quartz seals and magnetron feeding, to achieve multi-directional microwave radiation, overcoming the uneven heating problem caused by traditional single-point feeding. It is particularly suitable for large-volume alloys or irregularly shaped workpieces (such as gears and irregularly shaped castings), reducing localized overheating or cold zones, preventing component segregation during alloy melting, and improving reaction efficiency.

[0013] Preferably, the bottom of the furnace body is provided with a drain pipe that connects to the inside of the resonant cavity, the lower end of the drain pipe is a drain outlet, and a cap is detachably connected to the drain pipe; a first connector is provided on the left side of the drain pipe and a second connector is provided on the right side; a first control valve is provided on the first connector and a second control valve is provided on the second connector; a vacuum pump is connected to the first connector through a first atmosphere control pipe, and a special gas source is connected to the second connector through a second atmosphere control pipe; in this embodiment, the vacuum pump is a 2XZ-15 type rotary vane vacuum pump.

[0014] Conventional microwave equipment lacks vacuum or inert gas protection, leading to performance degradation of oxidation-sensitive materials such as titanium alloys and rare earth metals during heating. Furthermore, some reactions require strict oxygen isolation, such as the high-temperature synthesis of silicon carbide, necessitating complex external gas path systems in existing equipment, resulting in low integration. This reactor, through a modular design of the vacuum pump and special gas source, integrates vacuum / inert gas protection, solving the performance degradation problem of oxidation-sensitive materials (such as titanium alloys and rare earth metals) during heating. It meets the stringent process requirements of silicon carbide synthesis without the need for complex external gas path systems, significantly improving equipment integration and ease of operation.

[0015] Preferably, a pressure gauge is installed on the furnace cover to measure the gas pressure inside the resonant cavity; this facilitates monitoring the gas pressure inside the resonant cavity.

[0016] Preferably, an electric cylinder is installed on the support frame, the output shaft of the electric cylinder is vertically arranged, and a connecting sleeve is rotatably connected to the output shaft through a first bearing. A connecting handle is fixedly connected to the connecting sleeve, and a connecting plate is provided at the end of the connecting handle away from the connecting sleeve. The connecting plate is bolted and fixed to the furnace cover; this facilitates the opening and closing of the furnace cover and ensures the sealing of the furnace body and the furnace cover.

[0017] Preferably, the furnace also includes a connecting cylinder adapted to the furnace cover. A first flange connecting plate is provided along the lower edge of the connecting cylinder, and a second flange connecting plate adapted to the first flange connecting plate is provided at the top of the furnace body. The second flange connecting plate connects the outer wall and the inner wall and extends outward from the furnace body. The connecting cylinder and the furnace body are bolted together and fixed by 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 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 sealed connection structure, which facilitates the installation and maintenance of the reactor.

[0018] Preferably, a number of connecting seats are arranged circumferentially on the outer wall of the connecting cylinder, and a guide rod is hinged on each connecting seat. A handwheel is threaded onto the guide rod, and a pressing sleeve is rotatably connected to the lower end of the handwheel through a second bearing. A locking tooth is provided on the side of the pressing sleeve near the furnace cover, and a locking groove that mates with the locking tooth is provided on the furnace cover.

[0019] Preferably, a bracket is provided at the bottom of the resonant cavity, and an insulation box is provided on the bracket; the insulation box is composed of a bottom plate, a cover plate, and several unit enclosure plates; by setting up an insulation box, the material to be heated is placed in the insulation box, which can reduce the ineffective loss of microwave energy, make the heat energy more concentrated on the reactants, and improve the heating efficiency, especially suitable for processes that require long-term heat preservation, such as high-temperature alloy melting and ceramic sintering; at the same time, the modular structure facilitates partial replacement or cleaning, avoiding the problem of needing to replace the entire insulation layer due to partial damage, thus reducing maintenance costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the microwave heating reactor in an embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram of the furnace body in an embodiment of this utility model;

[0022] Figure 3 This is a cross-sectional view of the furnace body in an embodiment of this utility model;

[0023] Figure 4 yes Figure 3 Enlarged structural diagram at point A;

[0024] Figure 5 yes Figure 3 Enlarged structural diagram at point B;

[0025] Figure 6 yes Figure 3 Enlarged structural diagram at point C;

[0026] Figure 7 yes Figure 3 Enlarged structural diagram at point D;

[0027] Figure 8 This is a top view of the thermocouple structure in an embodiment of this utility model.

[0028] Explanation of reference numerals in the attached drawings: 1. Support frame; 2. Furnace body; 201. Outer wall; 202. Inner wall; 3. Furnace cover; 301. Slot; 4. Magnetron; 5. Water inlet; 6. Water circulation pipe assembly; 7. Electric cylinder; 8. Connecting sleeve; 9. Connecting handle; 10. Connecting plate; 11. Connecting seat; 12. Guide rod; 13. Handwheel; 14. Crimping sleeve; 1401. Clamping tooth; 15. Connecting cylinder; 16. First flange connecting plate; 17. Second flange connecting plate; 18. Caster wheel; 19. Connecting leg. ; 20. Base; 21. Pressure gauge; 22. Waveguide; 23. Excitation chamber; 2301. Connecting end cap; 2302. Connecting end plate; 24. Water outlet; 25. Bracket; 26. Base plate; 27. Cover plate; 28. Unit enclosure plate; 29. ​​Quartz seal; 30. First sealing ring; 31. Second sealing ring; 32. Drain pipe; 33. First connector; 34. Second connector; 35. Cover; 36. Third sealing ring; 37. Fourth sealing ring; 38. Socket; 39. Thermocouple. Detailed Implementation

[0029] The present invention will be further described below with reference to specific embodiments. The purpose of this description is only to better understand the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0030] like Figures 1 to 3As shown, this embodiment provides a microwave heating reactor, including a support frame 1, a furnace body 2 disposed in the support frame 1, and a furnace cover 3 sealed 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, and a magnetron 4 for emitting microwaves into the resonant cavity is disposed on the furnace body 2; the gap between the outer wall 201 and the inner wall 202 forms a water-cooling cavity, and an inlet 5 and an outlet 24 are disposed on the outer wall 201. It also includes a water circulation pipe assembly 6 connected to the inlet 5 and the outlet 24, a water cooling system connected to the water circulation pipe assembly 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 2460MHz±50MHz, continuously adjustable power 0-1250W), with a single tube life ≥8000 hours. The water circulation pipe assembly 6 includes an inlet pipe connected to the inlet 5 and an outlet pipe connected to the outlet 24. The water cooling system is a chiller unit, with the inlet pipe connected to the outlet end of the chiller unit and the outlet pipe connected to the return end of the chiller unit. The chiller unit is existing technology; for example, it can be a water-cooled chiller unit, including a compressor, condenser, cooling tower, expansion valve, evaporator, water tank, and water pump. Initially, the compressor draws in low-temperature, low-pressure refrigerant gas after evaporation and cooling, then compresses it into high-temperature, high-pressure gas and sends it to the condenser. The high-pressure, high-temperature gas is cooled by the condenser, causing it to condense into a normal-temperature, high-pressure liquid. When the normal-temperature, high-pressure liquid flows into the thermostatic expansion valve, it is throttled into low-temperature, low-pressure wet vapor, which flows into the shell-and-tube evaporator, absorbing heat from the chilled water in the evaporator and lowering the water temperature. The evaporated refrigerant is then drawn back into the compressor, repeating the next refrigeration cycle.

[0031] By designing a water-cooled 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 of low efficiency of traditional equipment relying on natural cooling or fan cooling, significantly improving heat dissipation capacity, ensuring that the equipment temperature is always within a safe range, extending service life and enhancing safety.

[0032] like Figure 8 As shown, the furnace body 2 is equipped with a thermocouple 39 for detecting the temperature inside the resonant cavity, and the thermocouple 39 is connected to the main controller; specifically, the furnace body 2 is equipped with a socket 38, and a fourth sealing ring 37 is provided in the socket 38. The thermocouple 39 is inserted into the socket 38 and is sealed to the socket 38 through the fourth sealing ring 37.

[0033] like Figure 3 , Figure 4As shown, several waveguides 22 are arranged circumferentially on the furnace body 2, and the waveguides 22 penetrate the outer wall 201 and the inner wall 202. An annular flange is provided on the inner side of the inner end of the waveguide 22, and a quartz seal 29 is provided on the annular flange. The quartz seal 29 has a U-shaped cross-section. In this embodiment, the quartz seal is made of high-purity fused quartz (SiO2≥99.99%), the U-shaped structure has a wall thickness of 3mm, and a temperature resistance ≥1200℃. The quartz seal 29 has both sealing and wave-transmitting functions. The quartz window allows microwave energy to enter the cavity, while the dense structure of the quartz effectively isolates gas and liquid permeation, maintaining the stability of the reaction cavity. Vacuum or a specific atmosphere (such as an inert gas); the outer end of the waveguide 22 is sealed with an excitation cavity 23. One end of the excitation cavity 23 is provided with a connecting end cap 2301, and the other end is provided with a connecting end plate 2302. The excitation cavity 23 is bolted and fixed to the outer end of the waveguide 22 through the connecting end cap 2301. The outer end of the waveguide 22 is also provided with a first groove, and a first sealing ring 30 is provided in the first groove. A crimping part is provided on the connecting end cap 2301, which is crimped onto the first sealing ring 30 to ensure a sealed connection between the connecting end cap 2301 and the outer end of the waveguide 22. The excitation cavity 23 is connected to a magnetron 4 through the connecting end plate 2302; in this embodiment, as Figure 2 .

[0034] This reactor employs a multi-magnetron 4 circumferentially distributed design, with several magnetrons 4 evenly distributed circumferentially on the outer wall of the heating chamber to achieve three-dimensional uniform microwave radiation, solving the problem of uneven heating for large-volume or irregularly shaped items. Conventional microwave heating devices often use single-point or limited-direction microwave feeding, leading to uneven heating inside large-volume materials, easily causing local overheating or cold zones, affecting the reaction effect, such as component segregation during alloy melting. For irregularly shaped items, such as gears and irregularly shaped castings, single-point or limited-direction microwave feeding will lead to increased microwave reflection and standing wave effects, further deteriorating heating uniformity. This reactor uses a circumferentially spaced multi-waveguide 22 structure, combined with quartz seals 29 and magnetron 4 feeding, to achieve multi-directional microwave radiation, overcoming the heating unevenness problem caused by traditional single-point feeding. It is especially suitable for large-volume alloys or irregularly shaped workpieces (such as gears and irregularly shaped castings), reducing local overheating or cold zones, avoiding component segregation during alloy melting, and improving the reaction effect.

[0035] like Figure 3 , Figure 6As shown, the bottom of the furnace body 2 is provided with a drain pipe 32 that connects to the inside of the resonant cavity. The lower end of the drain pipe 32 is a drain outlet, and a cap 35 is detachably connected to the drain pipe 32. After removing the cap 35, the reaction residue can be discharged through the drain pipe 32. A first connector 33 is provided on the left side of the drain pipe 32, and a second connector 34 is provided on the right side. A first control valve is provided on the first connector 33, which is a one-way valve, and a second control valve is provided on the second connector 34. A vacuum pump is connected to the first connector 33 through a first atmosphere control pipe, and a special gas source is connected to the second connector 34 through a second atmosphere control pipe.

[0036] During vacuuming, close the second control valve of the drain pipe 32, open the first control valve and the vacuum pump, and monitor the vacuum level in the resonant cavity to the target value (e.g., 10⁻³Pa) using the pressure gauge 21.

[0037] 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 atmospheric pressure or slightly positive pressure (0.1-0.2MPa).

[0038] Conventional microwave equipment lacks vacuum or inert gas protection, leading to performance degradation of oxidation-sensitive materials such as titanium alloys and rare earth metals during heating. Furthermore, some reactions require strict oxygen isolation, such as the high-temperature synthesis of silicon carbide, necessitating complex external gas path systems in existing equipment, resulting in low integration. This reactor, through a modular design of the vacuum pump and special gas source, integrates vacuum / inert gas protection, solving the performance degradation problem of oxidation-sensitive materials (such as titanium alloys and rare earth metals) during heating. It meets the stringent process requirements of silicon carbide synthesis without the need for complex external gas path systems, significantly improving equipment integration and ease of operation.

[0039] like Figure 1 The furnace cover 3 is equipped with a pressure gauge 21 for measuring the gas pressure inside the resonant cavity; this facilitates monitoring the gas pressure inside the resonant cavity.

[0040] like Figure 1 An electric cylinder 7 is installed on the support frame 1. The output shaft of the electric cylinder 7 is vertically set. 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. A connecting plate 10 is set at the end of the connecting handle 9 away from the connecting sleeve 8. The connecting plate 10 is bolted and fixed to the furnace cover 3. This facilitates the opening and closing of the furnace cover 3 and ensures the sealing of the furnace body 2 and the furnace cover 3.

[0041] like Figure 2 , Figure 7As shown, it also 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 of the furnace body 2. The connecting cylinder 15 and the furnace body 2 are bolted together and fixed by 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, ensuring the precise alignment of the furnace cover 3 and the furnace body 2 and enhancing 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 provided in the third groove. The first flange connecting plate 16, the second flange connecting plate 17, and the third sealing ring 36 constitute a detachable sealing connection structure, which facilitates the installation and maintenance of the reactor.

[0042] like Figure 3 , Figure 5 As shown, a plurality of connecting seats 11 are arranged circumferentially at intervals on the outer wall 201 of the connecting cylinder 15. Each connecting seat 11 is hinged with a guide rod 12, and the guide rod 12 is threadedly connected to a handwheel 13. The lower end of the handwheel 13 is rotatably connected to a pressing sleeve 14 through a second bearing. The pressing sleeve 14 is provided with a retaining tooth 1401 on the side near the furnace cover 3, and the furnace cover 3 is provided with a retaining groove 301 that mates with the retaining tooth 1401. In this embodiment, as Figure 5 As shown, the upper edge of the connecting cylinder 15 is provided with a Z-shaped connecting part, and the edge of the furnace cover 3 is provided with a Z-shaped overlapping part that is adapted to the Z-shaped connecting part. The end of the Z-shaped overlapping part near the furnace cover 3 is provided with a downwardly extending baffle. The Z-shaped connecting part is provided with a second groove, and a second sealing ring 31 is provided in the second groove. The sealing performance of the resonant cavity is further enhanced by the baffle and the second sealing ring 31. The second bearing is a thrust bearing, which facilitates turning the handwheel 13.

[0043] During loading, 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 ingots) is placed in the heat preservation box of the bracket 25. The cover plate 27 and the unit enclosure plate 28 are spliced ​​to form a closed heat preservation environment. Then the furnace cover 3 is rotated again, the electric cylinder 7 drives the furnace cover 3 to descend, close the furnace body 2, rotate the guide rod 12 so that the handwheel 13 faces upward, rotate the handwheel 13 so that the locking tooth 1401 is locked in the locking groove 301, lock the furnace cover 3, prevent the internal pressure of the resonant cavity from rising after the heating reaction, and lift the furnace cover 3. At the same time, it further ensures the sealing of the resonant cavity.

[0044] A bracket 25 is provided at the bottom of the resonant cavity, and an insulation box is provided on the bracket 25. The insulation box is composed of a base plate 26, a cover plate 27, and several unit enclosure plates 28. By setting up an insulation box, the material to be heated is placed in the insulation box, which can reduce the ineffective loss of microwave energy, make the heat energy more concentrated on the reactants, and improve the heating efficiency. It is especially suitable for processes that require long-term heat preservation, such as high-temperature alloy melting and ceramic sintering. At the same time, the modular structure facilitates partial replacement or cleaning, avoiding the problem of needing to replace the entire insulation layer due to partial damage, thus reducing maintenance costs.

[0045] During use, the magnetron 4 power (e.g., 1kW), target temperature (e.g., 600℃), and holding time (e.g., 30min) are pre-set via the main controller. During microwave heating, the magnetron 4 is activated, and microwaves are fed into the resonant cavity through the waveguide 22 and quartz seal 29. Thermocouple 39 provides real-time temperature feedback, and the main controller dynamically adjusts the power to maintain temperature uniformity (temperature difference within ±12℃). Monitoring is required during heating; observe the pressure gauge 21 and thermocouple 39, and immediately stop the machine if any abnormalities are detected. When high-temperature heating is involved, the chiller unit needs to be turned on to cool the furnace body 2, protecting components and preventing overheating. During unloading, open the furnace cover 3, remove the processed material, and clean any residue from the resonant cavity.

[0046] The experimental data of this reactor (with 3×4×1.5kW magnetrons arranged in a ring) compared to the traditional single magnetron 4 microwave oven (6kW) are shown in Table 1. The sample used was a ZL205A aluminum alloy ingot (Ø200mm×300mm, mass 25kg).

[0047] Performance indicators Traditional equipment This embodiment Improvement effect Temperature uniformity (°C) Surface temperature difference ±85 Surface temperature difference ±12 Improvement of 85% Melting time 42min 28min shortened by 33% Energy consumption 18.6kWh 14.2kWh 24% reduction Compositional segregation (Cu) The difference between the center and the edge is 4.2 wt%. The difference between the center and the edge is 0.8 wt%. Segregation reduced by 81% Oxide layer thickness 120-150μm <20μm (Ar protection) Significantly inhibits oxidation

[0048] Table 1

[0049] Traditional single-magnetron microwave ovens (4 units): Single-point microwave feed results in a significant temperature gradient, with edge overheating (maximum 620℃) and center lag (minimum 535℃), leading to a surface temperature difference of ±85℃. The alloy melt has poor fluidity, and Cu is enriched at the edges (EDS shows 6.3wt% Cu at the edges, only 2.1wt% at the center). This reactor: Multiple magnetrons (4 units) provide circumferential radiation, resulting in a uniform temperature distribution and a surface temperature difference controlled within ±12℃ (602℃±5℃ at the center, 610℃±7℃ at the edges); Cu segregation is significantly improved (the difference in content between the edges and the center decreases from 4.2wt% to 0.8wt%). Therefore, the quincunx-shaped waveguide layout (22 units) effectively suppresses the standing wave effect, achieving three-dimensional uniform heating.

[0050] Compared to existing technologies, this reactor is suitable for heating large-volume or irregularly shaped items, as well as for reactions requiring vacuum or inert gas. Through structural optimization and functional integration, it significantly improves the applicability of microwave heating technology in special materials and complex processes.

[0051] Meanwhile, to facilitate the movement of the main body of the reactor, casters 18 are provided at the bottom of the support frame 1, and connecting feet 19 are provided at the four corners. The lower end of the connecting feet 19 is threaded to the base 20. In use, by rotating the base 20, the lower edge of the casters 18 is lower than the lower edge of the base 20, and the support frame 1 can be moved by the casters 18. After moving to the specified position, the base 20 is rotated to suspend it in the air, so that the entire reactor is placed in the specified position and no longer moves.

[0052] The above description is merely a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A microwave heating reactor characterized by: The furnace includes a support frame (1), a furnace body (2) is installed in the support frame (1), and a furnace cover (3) is sealed 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, and a magnetron (4) is installed on the furnace body (2) to emit microwaves into the resonant cavity; the gap between the outer wall (201) and the inner wall (202) forms a water-cooled cavity, and an inlet (5) and an outlet (24) are installed on the outer wall (201).

2. The microwave heating reactor of claim 1, wherein: The furnace body (2) is equipped with a thermocouple (39) for detecting the temperature inside the resonant cavity.

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

4. The microwave heating reactor of claim 1, wherein: Several waveguides (22) are arranged circumferentially on the furnace body (2). The waveguides (22) are arranged through the outer wall (201) and the inner wall (202). An annular flange is provided on the inner side of the inner end of the waveguide (22). A quartz seal (29) is provided on the annular flange. An excitation cavity (23) is sealed and connected to the outer end of the waveguide (22). A magnetron (4) is connected to the excitation cavity (23).

5. The microwave heating reactor of claim 1, wherein: The bottom of the furnace body (2) is provided with a drain pipe (32) that connects to the inside of the resonant cavity. The lower end of the drain pipe (32) is a drain port. A cover (35) is detachably connected to the drain pipe (32). A first connector (33) is provided on the left side of the drain pipe (32) and a second connector (34) is provided on the right side. A first control valve is provided on the first connector (33) and a second control valve is provided on the second connector (34). A vacuum pump is connected to the first connector (33) through a first atmosphere control pipe, and a special gas source is connected to the second connector (34) through a second atmosphere control pipe.

6. The microwave heating reactor of claim 5, wherein: A pressure gauge (21) for measuring the gas pressure inside the resonant cavity is installed on the furnace cover (3).

7. The microwave heating reactor of claim 1, wherein: An electric cylinder (7) is installed on the support frame (1). The output shaft of the electric cylinder (7) is vertically set. A connecting sleeve (8) is rotatably connected to the output shaft through the first bearing. A connecting handle (9) is fixedly connected to the connecting sleeve (8). A connecting plate is installed at the end of the connecting handle (9) away from the connecting sleeve (8). The connecting plate is bolted to the furnace cover (3).

8. The microwave heating reactor of claim 1, wherein: It also includes a connecting cylinder (15) adapted to the furnace cover (3), with a first flange connecting plate (16) 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) 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 to the outside of the furnace body (2); the connecting cylinder (15) and the furnace body (2) are bolted together and fixed by the first flange connecting plate (16) and the second flange connecting plate (17).

9. The microwave heating reactor of claim 8, wherein: A number of connecting seats (11) are arranged circumferentially on the outer wall (201) of the connecting cylinder (15). Each connecting seat (11) is hinged with a guide rod (12). The guide rod (12) is threaded with a handwheel (13). The lower end of the handwheel (13) is rotatably connected to a pressing sleeve (14) through a second bearing. The pressing sleeve (14) is provided with a locking tooth (1401) on the side near the furnace cover (3). The furnace cover (3) is provided with a slot (301) that mates with the locking tooth (1401).

10. The microwave heating reactor of claim 1, wherein: A bracket (25) is provided at the bottom of the resonant cavity, and an insulation box is provided on the bracket (25); the insulation box is spliced ​​together from a bottom plate (26), a cover plate (27) and several unit enclosure plates (28).

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