CN106211405B - A tunnel-type multi-mode microwave resonator with gyration function - Google Patents

Abstract

The invention relates to a tunnel-type multi-mode microwave resonant cavity with a rotary function. The microwave resonant cavity is composed of a hollow hexagonal prism. The positions of 4 microwave energy feed ports are simulated and positioned by using the high-frequency structure simulation software HFSS. The 4 microwave resonators have a total of 4KW Microwave energy is fed into the tubes from different directions. After electromagnetic wave energy feeding simulation, the energy distribution of the microwave resonator is improved, and the focus point of microwave energy in the resonator is significantly reduced. Pipes made of microwave absorbing materials such as ceramics and glass, the installed pipes can be rotated under the drive of the rotary device, so that the materials in the pipes can receive microwave radiation more uniformly. In the field of environmental protection, it is suitable for processing agricultural and forestry waste, waste rubber, waste plastic, waste printed circuit board, etc. It can be processed in batches intermittently, and it can also be combined with other conveying and processing equipment to achieve fluidized operations. It has a simple structure and high efficiency. The practical application value is beneficial to the promotion of industrialization.

Description

A tunnel-type multi-mode microwave resonator with gyration function

technical field

The invention relates to a tunnel-type multi-mode microwave resonant cavity with a rotary function.

Background technique

Microwaves are electromagnetic waves with a frequency of 300MHz-300GHz, and the wavelength range is between 0.1cm-100cm. According to international regulations, the frequencies for civilian use are 915MHz and 2450MHz. The power of domestic microwave ovens in my country is 2450MHz. Microwave acts on polar molecular substances, and the internal molecules or atoms of the heated material vibrate at high frequency in the microwave field to generate "internal friction heat" so that the microwave energy is transferred to the molecules or atoms in the form of heat, thereby increasing the temperature of the entire material Without any heat conduction process, the inside and outside of the material can be heated and heated at the same time. The heating speed is fast, and only a fraction or a few tenths of the energy consumption of traditional heating methods can reach the same heating level. Therefore, microwave heating equipment It belongs to energy-saving and environmental protection products. The amount of heat generated by substances in the microwave field has a great relationship with the type of substances and their dielectric properties. The dielectric loss of polar substances is high, and the temperature rise rate in the microwave field per unit time is much higher than that of non-polar substances. The microwave resonant cavity is a space to realize the interaction between microwave and materials, and can be divided into single-mode microwave resonant cavity and multi-mode microwave resonant cavity. The multi-mode microwave resonant cavity has simple structure and less loss. A household microwave oven is a typical multi-mode microwave resonant cavity, which is a metal structure in a closed space formed by bending and spot welding an iron plate or stainless steel plate of a certain thickness, with six reflecting surfaces and a microwave energy feeding port. Most of the microwave equipment used in industry and laboratories is a cuboid box structure or modified from a household microwave oven, and its microwave irradiation uniformity is not good enough.

Contents of the invention

The purpose of the present invention is to overcome the disadvantage of poor radiation uniformity of the traditional cubic box-type microwave resonator, and propose a tunnel-type multi-mode microwave resonator with rotary function, which has more reflections than the traditional cuboid box-type microwave resonator On the other hand, the positions of four microwave energy feed ports were simulated and positioned by using the high-frequency structure simulation software HFSS, and four microwave tubes totaling 4KW were respectively fed into microwave energy from different directions. After electromagnetic wave energy feed simulation, the energy distribution of the microwave resonator was improved. The focus points (hot spots) of microwave energy in the resonant cavity are significantly reduced. At the same time, the middle part of the resonant cavity is designed with a pipeline installation position, which can be assembled with pipelines made of low microwave absorption materials such as ceramics and glass. The installed pipeline can be driven by the rotary device. Rotate down to make the material in the tube more evenly irradiated by microwave.

The present invention proposes a tunnel-type multi-mode microwave resonant cavity with rotary function, consisting of a rotary structure, energy feeding part, microwave leakage protection, temperature measurement and gas inlet and exhaust system, and a hexagonal main cavity 16, wherein:

The inner two ends of the hexagonal main cavity 16 are sealed by the hexagonal end cap 9, and the surface is provided with a waveguide 10 and an infrared temperature measuring probe 11, the waveguide 10 is used to place a microwave tube, and the infrared temperature measuring probe 11 is used to measure ceramic Tube 12 surface temperature; the six faces of the inner wall of the hexagonal main cavity 16 are six reflective faces;

The rotary structure is composed of bearing 1, speed regulating motor 2, sprocket 3, left ceramic tube outer sleeve 4, bearing seat 6, right ceramic tube outer sleeve 13 and ceramic tube 12, and the two ends of the ceramic tube 12 pass through the hexagonal end cap 9 and the hexagonal main cavity 16, the two ends of the ceramic tube 12 are respectively placed in the left ceramic tube outer sleeve 4 and the right ceramic tube outer sleeve 13, the left ceramic tube outer sleeve 4 and the right ceramic tube outer sleeve 13 Cooperate with the corresponding bearing 1 respectively, the bearing 1 is installed in the bearing seat 6, the outer sleeve 4 of the left ceramic tube cooperates with the sprocket 3, and the sprocket 3 is connected with the speed regulating motor 2 to complete the rotation of the ceramic tube 12; the hexagonal main The outside of both ends of the cavity 16 is fixedly connected with the corresponding bearing seat 6 through the hexagonal flange 7;

The energy feeding part is composed of the first energy feeding port 17, the second energy feeding port 18, the third energy feeding port 19 and the fourth energy feeding port 20. The first energy feeding port 17, the second energy feeding port 18, the The positions of the three energy feed ports 19 and the fourth energy feed ports 20 are calculated by the high-frequency structure simulation software HFSS module software. According to the obtained first energy feed ports 17, second energy feed ports 18, third energy feed ports 19 and For the data of the fourth energy feed port 20, set the corresponding microwave tube placement position;

Microwave leakage protection, temperature measurement and gas intake and discharge system includes travel switch 8, air distribution plate 15, intake pipe 5 and exhaust pipe 14, the travel switch 8 is fixed on the outer surface of the hexagonal main cavity 16, the travel switch 8 is used to monitor the hexagonal flange 7, the left ceramic pipe outer sleeve 4 is connected to the intake pipe 5, and the right ceramic pipe outer sleeve 13 is connected to the exhaust pipe 14 through the air distribution plate 15.

In the present invention, any one of chain transmission or gear meshing transmission is adopted between the sprocket 3 and the speed regulating motor 2 .

In the present invention, the hexagonal flange 7 is replaced by a hexagonal circular or hexagonal flange.

In the present invention, the long and short sides of the openings of the first energy feed port 17, the second energy feed port 18, and the fourth energy feed port 20 are parallel to the long and short sides of the half-expanded view of the hexagonal main cavity 16 (Fig. 2). The three-feed energy port 19 and the long and short sides of the opening are perpendicular to the long and short sides of the half-expanded view of the hexagonal main cavity 16 ( FIG. 2 ).

In the present invention, when all the six reflective surfaces of the hexagonal main cavity (16) are unfolded and are on the same plane, the distance between the first energy feeding port 17 and the long side centerline of the second energy feeding port 18 is 90- 100mm, the distance between the centerline of the long side of the second energy feeder 18 and the centerline of the short side of the third energy feeder 19 is 145-155mm, the centerline of the long side of the fourth energy feeder 20 and the centerline of the short side of the third energy feeder 19 The distance is 85-95mm, and the distance between the centerline of the long sides of the first energy feed port 17 and the fourth energy feed port 20 is 150-160 mm.

In the present invention, the left ceramic tube outer sleeve 4, the right ceramic tube outer sleeve 13, the hexagonal end cap 9, the hexagonal flange 7, the hexagonal main cavity 16, the waveguide 10, the air intake pipe 5, the exhaust pipe 14 and the air distribution pipe Plate 15 is made of stainless steel.

The beneficial effects of the present invention are: the present invention has better uniformity of microwave irradiation in the hexagonal main cavity 16 , fewer microwave focusing hotspots, and relatively uniform distribution of microwave energy. Two sets of hexagonal flanges 7 matched by bolts are monitored by four travel switches 8 for tightness of cooperation. The air distribution plate 15, the outer sleeve of the left and right ceramic tubes, the flanges are closely matched with the inlet and outlet pipes and flanges, which can reduce the microwave leakage to within the national microwave safety leakage range.

The main starting point of the invention is to improve the uniformity of microwave irradiation and facilitate the realization of fluidized operation. Firstly, increase the reflective surface of the microwave resonant cavity, and design the main structure of the hexagonal multimode microwave resonant cavity, which has two more reflective surfaces than the traditional cuboid box structure, which increases the number of microwave reflections. Secondly, multiple microwave tubes are used to feed The most efficient solution is to use the high-frequency structure simulation software HFSS to simulate the design and optimize the position of the energy feed port, so that the resonant microwaves can be dispersed more evenly, and it is not easy to form microwave focusing hot spots. Receive relatively uniform microwave energy. The microwave equipment made of the multi-mode microwave resonant cavity can perform high-temperature microwave pyrolysis, carbonization, and synthesis of new materials. In the field of environmental protection, it is suitable for processing agricultural and forestry solid waste, waste rubber, waste plastic, waste printed circuit boards, etc. , It can also meet the needs of various medium and low temperature microwave chemical reactions.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention.

FIG. 2 is a schematic diagram of the energy feed port of the present invention, and a half-expanded view of the hexagonal main cavity 16 .

Fig. 3 is a microwave energy distribution diagram of the multi-mode microwave resonator cavity of the present invention.

Fig. 4 is a diagram of the microwave energy distribution on the wall surface of the ceramic tube in the middle part of the multimode microwave resonant cavity of the present invention.

Numbers in the figure: 1 is the bearing, 2 is the speed regulating motor, 3 is the sprocket, 4 is the outer sleeve of the left ceramic tube, 5 is the air intake pipe, 6 is the bearing seat, 7 is the hexagonal flange, 8 is the limit switch, 9 10 is the waveguide, 11 is the infrared temperature measuring probe, 12 is the ceramic tube, 13 is the outer sleeve of the right ceramic tube, 14 is the exhaust pipe, 15 is the air distribution plate, 16 is the hexagonal main cavity, 17 is the first energy feed port, 18 is the second energy feed port, 19 is the third energy feed port, and 20 is the fourth energy feed port.

Detailed ways

The present invention is further illustrated below by means of embodiments in conjunction with the accompanying drawings.

Embodiment 1: As shown in Figure 1, the exterior of the hexagonal main cavity 16 is fixed by two groups of four hexagonal flanges 7 fixed together by bolts, and the installation and sealing degree of the hexagonal flanges are controlled by four stroke switches. 8 monitoring, the left and right ends of the hexagonal main cavity 16 are sealed by two hexagonal end caps 9 . The four waveguides 10 installed externally can be installed with four 1KW microwave tubes, the infrared temperature probe 11 monitors the surface temperature of the ceramic tube 12, the hexagonal flange 7 and the bearing seat 6 are fixed by 6 bolts, and the bearing seat has installed bearings 1 , the bearing 1 cooperates with the left ceramic tube outer sleeve 4 and the right ceramic tube outer sleeve 13. Connected to each other, the interior is matched with the ceramic tube 12, and there is an air distribution plate 15 between the outer sleeve 13 of the ceramic tube and the exhaust pipe 14, which has the functions of air distribution and microwave leakage prevention. The outside of the left ceramic tube outer sleeve 4 cooperates with the sprocket 3, and the sprocket 3 is connected with the speed regulating motor by a transmission chain to complete the rotation function.

As shown in Fig. 2, the microwave energy feeder expansion diagram of the upper half of the hexagonal main cavity 16 has four energy feeders in total, the first energy feeder 17, the second energy feeder 18, the third energy feeder 19 and The fourth energy feed port 20, the positions of the first energy feed port 17, the second energy feed port 18, the third energy feed port 19 and the fourth energy feed port 20 are obtained by simulation calculation of the high-frequency structure simulation software HFSS software, The opening directions of the first energy feed port 17, the second energy feed port 18, and the fourth energy feed port 20 are consistent, and their long and short sides are parallel to the long and short sides of the upper half of the hexagonal main cavity 16. The distance is shown in Figure 2. The opening direction of the third energy feed port 19 is perpendicular to the long and short sides of the upper half of the hexagonal main cavity 16. The distance between the third energy feed port and the other energy feed ports is shown in Figure 2. The first energy feed port The center distance between 17 and the long side of the second energy feed port 18 is 95mm, the center distance between the long side of the second energy feed port 18 and the short side of the third energy feed port 19 is 151mm, and the long side of the fourth energy feed port 20 and the third energy feed port The distance between the centers of the short sides of 19 is 89mm, and the distance between the centers of the long sides of the fourth energy feed port 20 and the first energy feed port 17 is 157mm.

As shown in Figure 3, the microwave energy distribution diagram of the bottom wall of the multimode microwave resonator, the gray-white part in the middle is the area with the most microwave energy distribution, the light gray part is the area with relatively less energy distribution, and the dark gray part is the area with the least energy distribution , it can be seen from the figure that most of the microwave energy is distributed in the middle area of each reflective wall, the high-energy and low-energy transition areas are relatively gentle, there are no too many concentrated superheating and supercooling points, and the overall energy distribution is relatively uniform .

As shown in Figure 4, the microwave energy distribution diagram of the ceramic tube wall in the middle of the multimode microwave resonator, the gray-white part in the middle is the area with the most microwave energy distribution, the light gray part is the area with relatively less energy distribution, and the dark gray part is the area with the least energy distribution It can be seen from the figure that the distribution of dark gray and off-white parts is very small, most of the areas belong to light gray, and the high-energy and low-energy areas belong to smooth transitions without too many concentrated overheating and supercooling points. Overall, it can be concluded that The energy distribution is relatively uniform, so that the materials in the ceramic tube can receive relatively uniform microwave irradiation.

Working process of the present invention is as follows:

The ceramic tube 12 passes through the bearing 1, the hexagonal end cap 9, the left ceramic outer sleeve 4 and the right ceramic outer sleeve 13 and enters the hexagonal main cavity 16, and puts a certain quality of material into the ceramic tube 12 to set The operating temperature of the infrared thermometer 11, the rotating speed of the speed-regulating motor 2 and the microwave input power radiated into the hexagonal main cavity 16 through the waveguide 10, fix the left ceramic outer sleeve 4 and the right ceramic outer sleeve 13, and use bolts Tighten the hexagonal flange 7 and the bearing seat 6, and at the same time ensure that the limit switch 8 is in the closed state, connect the carrier gas pipe to the intake pipe 5, and set the intake air flow at the same time, start the speed regulating motor 2, and ensure that the sprocket 3 can rotate smoothly , start to the microwave working state, heat the material in the ceramic tube 12, and the generated volatile gas is discharged through the air distribution plate 15 and the exhaust pipe 14 under the drive of the carrier gas.

Claims (4)

1. a kind of tunnel type band revolute function multi-die microwave resonant chamber, it is characterised in that: revolving structure, energy regenerative part and microwave are let out Leakage protection, thermometric and gas are formed into heat-extraction system and six rib main cavities (16), in which:

Six rib main cavities (16) are horizontally disposed, and internal both ends are sealed by hexagonal end cap (9), and surface is equipped with waveguide (10) and red Outer temperature probe (11), the waveguide (10) is for placing microwave tube, and the infrared temperature probe (11) is for measuring ceramic tube (12) surface temperature；Six sides of six rib main cavity (16) inner walls and 2 hexagonal end caps (9) are eight reflectings surface；

Revolving structure is by bearing (1), speed regulating motor (2), sprocket wheel (3), left ceramic tube outer sleeve (4), bearing block (6), right ceramics Pipe outer sleeve (13) and ceramic tube (12) composition, ceramic tube (12) both ends pass through hexagonal end cap (9) and six rib main cavities (16), pottery The both ends of porcelain tube (12) are respectively sleeved in left ceramic tube outer sleeve (4) and right ceramic tube outer sleeve (13), left ceramic tube outer sleeve (4) cooperate respectively with corresponding bearing (1) with right ceramic tube outer sleeve (13), bearing (1) is installed in bearing block (6), Zuo Tao Porcelain tube outer sleeve (4) and sprocket wheel (3) cooperate, and sprocket wheel (3) is connected with speed regulating motor (2), complete ceramic tube (12) rotational action；Six It is fixedly connected between corresponding bearing block (6) by hexagonal flange (7) outside rib main cavity (16) both ends；Energy regenerative part is by One energy regenerative mouth (17), the second energy regenerative mouth (18), third energy regenerative mouth (19) and the 4th energy regenerative mouth (20) composition, the first energy regenerative mouth (17), the corresponding corresponding microwave tube of the second energy regenerative mouth (18), third energy regenerative mouth (19) and the 4th energy regenerative mouth (20), first feedback Can mouth (17), the second energy regenerative mouth (18), third energy regenerative mouth (19) and the 4th energy regenerative mouth (20) position emulated by high-frequency structure it is soft Part is calculated, according to obtained the first energy regenerative mouth (17), the second energy regenerative mouth (18), third energy regenerative mouth (19) and the 4th energy regenerative mouth (20) corresponding microwave tube placement location is arranged in data, and 4 microwave tubes are respectively from different directions to ceramic tube feed-in microwave Energy；

Microwave leakage protection, thermometric and gas include travel switch (8), air distribution plate (15), air inlet pipe (5) into heat-extraction system and are vented It manages (14), the travel switch (8) is fixed on six rib main cavity (16) outer surfaces, and the travel switch (8) is for monitoring hexagonal Flange (7), left ceramic tube outer sleeve (4) connect air inlet pipe (5), and right ceramic tube outer sleeve (13) passes through air distribution plate (15) connection row Tracheae (14).

2. tunnel type band revolute function multi-die microwave resonant chamber according to claim 1, it is characterised in that: the hexagonal flange (7) it is replaced using hexagonal circle or hexagonal square flange.

3. tunnel type band revolute function multi-die microwave resonant chamber according to claim 1, it is characterised in that: the first energy regenerative mouth (17), the long short side direction of the opening reflecting surface corresponding to six rib main cavity (16) of the second energy regenerative mouth (18), the 4th energy regenerative mouth (20) On long short side direction it is consistent, the long short side direction of opening of third energy regenerative mouth (19) reflecting surface corresponding to six rib main cavity (16) On long short side direction it is vertical.

4. tunnel type according to claim 1 band revolute function multi-die microwave resonant chamber, it is characterised in that: when by six rib main cavities (16) six reflectings surface are all unfolded, and when being in same plane, the first energy regenerative mouth (17) and the second energy regenerative mouth (18) are long Side center line distance is 90-100mm, the second energy regenerative mouth (18) long side center line and third energy regenerative mouth (19) short side center line distance For 145-155mm, the 4th energy regenerative mouth (20) long side center line and third energy regenerative mouth (19) short side center line distance are 85-95mm, First energy regenerative mouth (17) and the 4th energy regenerative mouth (20) long side center line distance are 150-160mm.