A flat hole array energy feeding structure for improving microwave uniformity in high temperature furnace

Abstract

The present invention discloses a flat hole array energy feeding structure for improving the microwave uniformity of a high-temperature furnace, comprising an energy feeding waveguide (1), an impedance matching structure (2), a large-size microwave energy feeding resonant cavity (3), a flat hole array structure (4), a microwave diffusion structure (5), a microwave action cavity (6), a high-temperature furnace structure (7), and a heated material (8). The present invention has a reasonable structural design, which allows microwave energy to be dispersed and evenly pass through a heat-insulating material, and can effectively improve the microwave field uniformity of the high-temperature furnace, solve the problem of heat-insulating material ablation, extend the service life of the heat-insulating material in the microwave field, improve the reliability of the long-term operation of the high-temperature furnace, and realize the industrial application of microwave high-temperature projects.

Description

Technical Field

[0001] The present invention belongs to the field of microwave high-temperature furnaces, and specifically relates to a flat hole array energy feeding structure for improving microwave uniformity of high-temperature furnaces, which is used to disperse microwave field intensity in high-temperature furnaces, improve microwave uniformity, and realize long-term industrial application of microwave high-temperature furnaces. Background Art

[0002] In high-temperature industrial microwave equipment, alumina ceramic fiber insulation materials are usually used. Such materials have good high temperature resistance, heat insulation, and thermal insulation properties, and usually have good wave transmission properties at room temperature. However, such materials will show obvious wave absorption under high microwave electric field intensity, and when the working temperature of the material increases, this wave absorption phenomenon will also increase, causing it to ablate and melt, and it cannot work normally. Therefore, in high-power high-temperature industrial microwave equipment, it is particularly important to reasonably design the energy feeding method so that the microwave energy can be dispersed and evenly passed through the insulation material to avoid excessive microwave electric field intensity distribution in the local area, so as to protect the insulation material from being burned by microwaves, which is particularly important for ensuring the operation of microwave equipment. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to overcome the shortcomings of the prior art and provide a feeding device that uses an array of holes on the surface of a large-sized microwave feeding resonant cavity. Compared with the traditional rectangular waveguide and horn antenna feeding devices, this set of feeding devices can disperse the microwave energy in the feeding waveguide into the large-sized microwave feeding resonant cavity, and then feed the microwave energy into the microwave action cavity through the hole arrays of different sizes on its surface, so as to achieve the effect of multi-point feeding, so that the microwave energy is dispersed and evenly fed into the microwave action cavity. The opening position of each hole in the hole array should correspond to the position where the microwave electric field intensity peak appears in the feeding resonant cavity, and adjusting the size of the opening can adjust the microwave energy distribution in the microwave action cavity.

[0004] Technical solution: In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0005] A flat hole array energy feeding structure for improving microwave uniformity of a high-temperature furnace, comprising an energy feeding waveguide, an impedance matching structure, a large-size microwave energy feeding resonant cavity, a microwave diffusion structure and a microwave action cavity connected in sequence; a high-temperature furnace structure is arranged in the microwave action cavity, and a material to be heated is arranged in the high-temperature furnace structure;

[0006] The impedance matching structure is located between the energy feeding waveguide and the large-sized microwave energy feeding resonant cavity, and is used to perform impedance matching between the energy feeding waveguide and the microwave action cavity, reduce reflection, and feed microwave energy from the energy feeding waveguide into the microwave action cavity;

[0007] The flat hole array structure is arranged between the large-sized microwave feeding resonant cavity and the microwave active cavity. A plurality of holes are opened on the metal surface of the flat hole array structure for uniformly feeding microwaves from the large-sized microwave feeding resonant cavity into the microwave active cavity. The position of the openings should correspond to the position where the peak of the microwave electric field intensity in the large-sized microwave feeding resonant cavity appears. The size of the openings will affect the uniformity of the microwave feeding and can be analyzed and designed through electromagnetic field simulation calculation.

[0008] The microwave diffusion structure is located between the large-sized microwave energy feeding resonant cavity and the high-temperature furnace, which allows the microwave energy dispersed by the large-sized microwave energy feeding resonant cavity and the flat hole array structure to be dispersed again through the microwave diffusion structure and then enter the high-temperature furnace. It can further improve the dispersion effect of microwave energy and improve the uniformity of microwave energy feeding. In addition, the microwave diffusion structure also has the effect of impedance matching and reduces reflection.

[0009] The above-mentioned flat hole array energy feeding structure for improving microwave uniformity of a high-temperature furnace is characterized in that the energy feeding waveguide is used to transmit microwave energy from the microwave generator to the microwave energy feeding structure.

[0010] As a preferred solution, the above-mentioned flat hole array feeding structure for improving the microwave uniformity of a high-temperature furnace has a large-size microwave feeding resonant cavity that is larger than the feeding waveguide, and is used to disperse the microwave energy from the more concentrated feeding waveguide to a larger area; the thickness of the large-size microwave feeding resonant cavity is greater than half a microwave wavelength, and its length and width can be designed according to the required microwave resonance mode.

[0011] As a preferred solution, the above-mentioned flat hole array feeding structure for improving the microwave uniformity of a high-temperature furnace, the microwave action cavity is connected to a large-size microwave feeding resonant cavity, and the microwave energy is dispersed by the feeding structure and then enters the microwave action cavity through the feeding waveguide.

[0012] As a preferred solution, the above-mentioned flat hole array energy feeding structure for improving the microwave uniformity of a high-temperature furnace, the high-temperature furnace structure is mainly used to heat the heated material to 1000°C-1100°C, for completing high-temperature smelting, reduction and other reactions.

[0013] Beneficial effect: Compared with the prior art, its significant advantages are:

[0014] The flat-plate hole array feeding structure for improving the microwave uniformity of a high-temperature furnace provided by the present invention has a reasonable structural design and adopts a feeding device with array holes opened on the surface of a large-size microwave feeding resonant cavity. Compared with the feeding device of a traditional rectangular waveguide and an antenna, the present structure can feed microwave energy into the microwave action cavity through the hole arrays with different surfaces, thereby achieving a multi-point feeding effect and dispersing and evenly feeding the microwave energy into the microwave action cavity. The structure of the present invention disperses the microwave energy so as to evenly pass through the thermal insulation material, which can effectively improve the uniformity of the microwave field of the high-temperature furnace, solve the problem of ablation of the thermal insulation material, extend the service life of the thermal insulation material in the microwave field, improve the reliability of the long-term operation of the high-temperature furnace, and realize the industrial application of microwave high-temperature projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The present invention is a top view of a flat hole array energy feeding structure for improving microwave uniformity in a high-temperature furnace.

[0016] Figure 2 It is a front view of a flat plate hole array energy feeding structure provided by the present invention for improving microwave uniformity of a high-temperature furnace. DETAILED DESCRIPTION

[0017] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0018] like Figure 1 and Figure 2 As shown, a flat hole array feeding structure for improving the microwave uniformity of a high-temperature furnace is characterized in that it comprises a feeding waveguide 1, an impedance matching structure 2, a large-size microwave feeding resonant cavity 3, a microwave diffusion structure 5 and a microwave action cavity 6 which are connected in sequence; a high-temperature furnace structure 7 is arranged in the microwave action cavity 6, and a material to be heated 8 is arranged in the high-temperature furnace structure 7;

[0019] The impedance matching structure 2 is located between the energy feeding waveguide 1 and the large-sized microwave energy feeding resonant cavity 3, and is used to perform impedance matching between the energy feeding waveguide 1 and the microwave action cavity 6, reduce reflection, and feed microwave energy from the energy feeding waveguide 1 into the microwave action cavity 6;

[0020] The flat hole array structure 4 is arranged between the large-sized microwave energy feeding resonant cavity 3 and the microwave action cavity 6. A plurality of holes are provided on the metal surface of the flat hole array structure 4, which are used to uniformly feed microwaves from the large-sized microwave energy feeding resonant cavity 3 into the microwave action cavity 6. The positions of the holes correspond to the positions where the peaks of the microwave electric field intensity in the large-sized microwave energy feeding resonant cavity 3 appear. The size of the holes will affect the uniformity of the microwave energy feeding, and can be designed through electromagnetic field simulation calculation analysis.

[0021] The microwave diffusion structure 5 is located between the large-sized microwave energy feeding resonant cavity 3 and the high-temperature furnace 7, so that the microwave energy dispersed by the large-sized microwave energy feeding resonant cavity 3 and the flat hole array structure 4 can be dispersed again through the microwave diffusion structure 5 and then enter the high-temperature furnace 7. The microwave energy dispersion effect and microwave energy feeding uniformity can be further improved. In addition, the microwave diffusion structure also has the effect of impedance matching and reduces reflection.

[0022] The large-sized microwave feeding resonant cavity 3 is larger than the feeding waveguide 1 and is used to disperse the microwave energy from the more concentrated feeding waveguide 1 to a larger area. The thickness of the large-sized microwave feeding resonant cavity 3 is greater than half the microwave wavelength, and its length and width can be designed according to the required microwave resonance mode.

[0023] The microwave action cavity 6 is connected to the large-sized microwave energy feeding resonant cavity 3 . After the microwave energy is dispersed by the energy feeding structure, the microwave energy enters the microwave action cavity 6 through the energy feeding waveguide 1 .

[0024] The above-mentioned flat hole array energy feeding mechanism for improving the microwave uniformity of a high-temperature furnace, the high-temperature furnace structure 7 is mainly used to heat the heated material 8 to 1000°C-1100°C for completing high-temperature smelting, reduction and other reactions.

[0025] The flat plate hole array energy feeding structure for improving the microwave uniformity of a high-temperature furnace provided by the present invention can be widely used in the heating of coking coal. The microwave energy is dispersed through the flat plate hole array energy feeding structure so as to pass through the thermal insulation material evenly, thereby solving the problem that the thermal insulation material absorbs a large amount of microwaves and thus ablates, and the microwave energy is caused to pass through the thermal insulation material evenly to act on the coking coal, thereby greatly improving the heating efficiency of the coking coal, shortening the heating time of the coking coal, and obtaining coke of excellent quality.

[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A flat hole array energy feeding structure for improving microwave uniformity in a high temperature furnace, characterized in that: It comprises a feeding waveguide (1), an impedance matching structure (2), a large-size microwave feeding resonant cavity (3), a microwave diffusion structure (5) and a microwave action cavity (6) which are connected in sequence; a high-temperature furnace structure (7) is arranged in the microwave action cavity (6), and a material to be heated (8) is arranged in the high-temperature furnace structure (7); The impedance matching structure (2) is located between the energy feeding waveguide (1) and the large-sized microwave energy feeding resonant cavity (3), and is used to perform impedance matching between the energy feeding waveguide (1) and the microwave action cavity (6), thereby reducing reflection and allowing microwave energy to be fed from the energy feeding waveguide (1) into the microwave action cavity (6); The flat hole array structure (4) is arranged between the large-sized microwave energy feeding resonant cavity (3) and the microwave action cavity (6), and a plurality of holes are provided on the metal surface of the flat hole array structure (4) for uniformly feeding microwaves from the large-sized microwave energy feeding resonant cavity (3) into the microwave action cavity (6); The microwave diffusion structure (5) is located between the large-sized microwave energy feeding resonant cavity (3) and the high-temperature furnace structure (7), so that the microwave energy dispersed by the large-sized microwave energy feeding resonant cavity (3) and the flat hole array structure (4) can be dispersed again through the microwave diffusion structure (5) and then enter the high-temperature furnace structure (7); The large-sized microwave energy feeding resonant cavity (3) is larger in size than the energy feeding waveguide (1) and is used to disperse microwave energy from the relatively concentrated energy feeding waveguide (1) to a larger area; the thickness of the large-sized microwave energy feeding resonant cavity (3) is greater than half a microwave wavelength; The microwave action cavity (6) is connected to the large-sized microwave energy feeding resonant cavity (3); after the microwave energy is dispersed by the energy feeding structure, the microwave energy enters the microwave action cavity (6) through the energy feeding waveguide (1); The flat hole array structure (4) is a plurality of holes opened on the metal surface between the large-sized microwave energy feeding resonant cavity (3) and the microwave action cavity (6), and is used to relatively evenly feed microwaves from the large-sized microwave energy feeding resonant cavity (3) into the microwave action cavity (6). The positions of the holes should correspond to the positions where the peaks of the microwave electric field intensity in the large-sized microwave energy feeding resonant cavity (3) appear. The size of the holes will affect the uniformity of the microwave energy feeding and can be designed through electromagnetic field simulation calculation analysis.

2. The flat hole array energy feeding structure for improving microwave uniformity of a high temperature furnace according to claim 1, characterized in that: The high temperature furnace structure (7) has a heating temperature of 1000°C-1100°C.

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