Inner shielding microwave calcining bearing steel furnace

Abstract

The utility model provides an internal shielding microwave calcining bearing steel furnace, which is a microwave calcining furnace using microwaves as a heating mode, and comprises an outer shell, a heat insulation layer, an inner shell and a shielding layer which are sequentially arranged on the furnace wall of the calcining furnace from outside to inside, the shielding layer comprises a composite material fiber net made of a nano composite material of boron carbide and aluminum oxide, and the specification of the composite material fiber net is 20-200 meshes; according to the calcining furnace, the temperature distribution in the calcining furnace can be ensured to be uniform, the internal and external temperatures are consistent, meanwhile, the reaction atmosphere and the calcining pressure in the calcining furnace can be controlled through the atmosphere device and the furnace pressure device, and the calcining efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the field of microwave calcining equipment, in particular to an internal shielding microwave calcining furnace for bearing steel. Background Art

[0002] Because microwave heating is highly selective, the material being heated directly absorbs the microwave energy, heating it from the inside out. This results in rapid heating, high temperatures, high thermal efficiency, easy operation and control, and energy conservation and environmental protection. In recent years, microwaves have been widely used in various industrial fields, including calcination, sintering, smelting, and purification.

[0003] Chinese patent application number CN201520908256.2 discloses an internally shielded microwave calcining furnace that utilizes microwaves as a heating method. The furnace wall comprises, from the outside to the inside, an outer shell, a heat-insulating layer, and a shielding layer. The shielding layer is made of a refractory metal mesh or a perforated metal plate with a mesh size of 10 to 120, preferably 20 to 100. The use of the shielding layer can prevent the collapse of the microwave calcining furnace, reduce microwave energy loss, and improve microwave calcining efficiency. However, the calcining furnace suffers from uneven temperatures, resulting in inconsistent internal and external temperatures, which presents drawbacks and deficiencies. Utility Model Content

[0004] In order to solve the problems existing in the background technology, the utility model provides an internally shielded microwave calcining furnace for calcining bearing steel. The bearing steel calcining furnace is a microwave calcining furnace that uses microwaves as a heating method, comprising: the furnace wall of the calcining furnace comprises, from the outside to the inside, an outer shell, a thermal insulation layer, an inner shell and a shielding layer; the shielding layer comprises: a composite material fiber mesh made of a nano-composite material of boron carbide and aluminum oxide, and the specification of the composite material fiber mesh is 20 mesh to 200 mesh.

[0005] Preferably, the thermal insulation layer material is a polycrystalline fiber blanket.

[0006] Preferably, the shielding layer is in direct contact with one end of the waveguide tube to form a resonant cavity, and the other end of the waveguide tube is connected to a microwave source.

[0007] Preferably, the waveguide tube is made of SiC or corundum mullite.

[0008] Preferably, the calcining furnace is further provided with an exhaust device, and the exhaust device adopts an automatic exhaust valve.

[0009] Preferably, the calcining furnace also includes: a first furnace tube, a second furnace tube and a third furnace tube; one end of the first furnace tube, the second furnace tube and the third furnace tube are respectively connected to three interfaces of the three-way solenoid valve; the other end of the first furnace tube passes through the furnace wall of the calcining furnace and is connected to the inside of the calcining furnace; the other end of the second furnace tube is connected to the furnace pressure device; the other end of the third furnace tube is connected to the atmosphere device.

[0010] Preferably, the first furnace tube, the second furnace tube and the third furnace tube are made of SiC or corundum mullite.

[0011] Preferably, a furnace door is provided on the right side of the calcining furnace; the left end of the furnace door is fixedly connected to one end of the flange valve; a sealing sheet is provided between the left end of the furnace door and the flange valve for sealing the furnace door.

[0012] The utility model arranges the furnace wall of the calcining furnace from the outside to the inside into an outer shell, a heat-insulating layer, an inner shell, and a shielding layer; and arranges the shielding layer into a composite fiber mesh made of a nanocomposite material of boron carbide and aluminum oxide. This ensures that the temperature distribution in the calcining furnace is uniform, so that the internal and external temperatures are consistent. At the same time, the reaction atmosphere and calcining pressure in the calcining furnace can be controlled by an atmosphere device and an internal pressure device, thereby improving the calcining efficiency. The flange valve provided at the furnace door facilitates connection with other external devices, such as cooling tools, and facilitates the design of an automated calcining process. At the same time, the present invention shields microwaves through the above-mentioned technical measures, preventing microwaves from directly acting on refractory materials, while ensuring that the shielding components cannot be damaged by high temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention;

[0014] The reference numerals in the figures are:

[0015] 1. Outer shell, 2. Thermal insulation layer, 3. Inner shell, 4. Shielding layer, 5. Exhaust device, 6. Waveguide tube, 7. Microwave source, 8. Calcined material, 9. First furnace tube, 10. Second furnace tube, 11. Third furnace tube, 12. Furnace pressure device, 13. Atmosphere device, 14. Three-way solenoid valve, 15. Furnace door, 16. Sealing piece, 17. Flange valve. DETAILED DESCRIPTION

[0016] The following describes the embodiments of the present invention by means of specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0017] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the dimensions of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0018] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0019] See also Figure 1 The present invention provides an internally shielded microwave calcining furnace for calcining bearing steel. The bearing steel calcining furnace is a microwave calcining furnace that uses microwaves as a heating method, comprising: the furnace wall of the calcining furnace comprises, from the outside to the inside, an outer shell 1, a heat insulation layer 2, an inner shell 3 and a shielding layer 4; the shielding layer 4 comprises: a composite fiber mesh made of a nano-composite material of boron carbide and aluminum oxide, the specification of the composite fiber mesh is 20 mesh to 200 mesh, wherein the ratio of boron carbide to aluminum oxide can be 1:1, 2:1 or 3:1.

[0020] Preferably, the thermal insulation layer 2 is made of a polycrystalline fiber blanket.

[0021] Preferably, the shielding layer 4 is in direct contact with one end of the waveguide tube 6 to form a resonant cavity, and the other end of the waveguide tube is connected to the microwave source 7 .

[0022] Preferably, the waveguide tube 6 is made of SiC or corundum mullite.

[0023] Preferably, the calcining furnace is further provided with an exhaust device 5, which is an automatic exhaust valve.

[0024] Preferably, the calcining furnace also includes: a first furnace tube 9, a second furnace tube 10 and a third furnace tube 11; one end of the first furnace tube 9, the second furnace tube 10 and the third furnace tube 11 are respectively connected to three interfaces of the three-way solenoid valve 14; the other end of the first furnace tube 9 passes through the furnace wall of the calcining furnace and is connected to the inside of the calcining furnace; the other end of the second furnace tube 10 is connected to the furnace pressure device 12; the other end of the third furnace tube 11 is connected to the atmosphere device 13.

[0025] Preferably, the first furnace tube 9 , the second furnace tube 10 and the third furnace tube 11 are made of SiC or corundum mullite.

[0026] Preferably, a furnace door 15 is provided on the right side of the calcining furnace; the right end of the furnace door 15 is fixedly connected to the left end of the flange valve 17; a sealing sheet 16 is provided between the right end of the furnace door 15 and the flange valve 17 for sealing the furnace door 15, and the sealing sheet 16 is a gasket with a through hole provided thereon.

[0027] One way to use this utility model:

[0028] First, open the flange valve and place the calcined material into the calcining furnace through the flange valve 17, the sealing piece 16 and the furnace door 15 in sequence. Control the three-way solenoid valve 14 and the furnace pressure device 12 to provide gas to pressurize the furnace. The gas can be an inert gas. The reaction atmosphere is provided to the furnace through the three-way solenoid valve 14 and the atmosphere device 13. Then start the microwave source 7 to heat the shielding layer 4. After heating by the microwave source 7, after the calcination is completed, the pressure in the calcining furnace is reduced by the exhaust device 5, and the calcined calcined material is taken out.

[0029] In summary, the present invention arranges the furnace wall of the calcining furnace from the outside to the inside into an outer shell, a heat-insulating layer, an inner shell, and a shielding layer; and arranges the shielding layer into a composite fiber mesh made of a nano-composite material of boron carbide and aluminum oxide, thereby ensuring uniform temperature distribution inside the calcining furnace so that the internal and external temperatures are consistent. At the same time, the reaction atmosphere and calcination pressure inside the calcining furnace can be controlled by an atmosphere device and an internal pressure device, thereby improving the efficiency of calcination. By arranging a flange valve at the furnace door, it is convenient to connect with other external devices, such as cooling tools and other equipment, thereby facilitating the design of an automated calcination process. At the same time, the present invention shields microwaves through the above-mentioned technical measures to prevent microwaves from directly acting on refractory materials, while ensuring that the shielding components cannot be damaged by high temperatures. The distribution of the microwave source is adjusted to form microwaves of a certain intensity in the middle part of the furnace to further control the temperature and prevent damage to the refractory bricks.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all be included in the scope of the claims of the present invention.

Claims

1. An internal shielded microwave calcining furnace for calcining bearing steel, wherein the calcining furnace for calcining bearing steel is a microwave calcining furnace that uses microwaves as a heating method, characterized in that: include: The furnace wall of the calcining furnace comprises, from the outside to the inside, an outer shell (1), a heat-insulating layer (2), an inner shell (3) and a shielding layer (4); the shielding layer (4) comprises a composite fiber mesh made of a nano-composite material of boron carbide and aluminum oxide, the specification of the composite fiber mesh being 20 mesh to 200 mesh; the shielding layer (4) is in direct contact with one end of a waveguide tube (6) to form a resonant cavity, and the other end of the waveguide tube is connected to a microwave source (7).

2. The internal shielded microwave calcining furnace for bearing steel according to claim 1, characterized in that: The thermal insulation layer (2) is made of a polycrystalline fiber blanket.

3. The internal shielded microwave calcining furnace for bearing steel according to claim 1, characterized in that: The waveguide tube (6) is made of SiC or corundum mullite.

4. The internal shielded microwave calcining furnace for bearing steel according to claim 1, characterized in that: An exhaust device (5) is also provided on the calcining furnace, and the exhaust device adopts an automatic exhaust valve.

5. The internal shielded microwave calcining furnace for bearing steel according to claim 1, characterized in that: The calcining furnace further comprises: a first furnace tube (9), a second furnace tube (10) and a third furnace tube (11); one end of the first furnace tube (9), the second furnace tube (10) and the third furnace tube (11) are respectively connected to three interfaces of a three-way electromagnetic valve (14); the other end of the first furnace tube (9) passes through the furnace wall of the calcining furnace and is connected to the interior of the calcining furnace; the other end of the second furnace tube (10) is connected to a furnace pressure device (12); and the other end of the third furnace tube (11) is connected to an atmosphere device (13).

6. The internal shielded microwave calcining furnace for bearing steel according to claim 5, characterized in that: The first furnace tube (9), the second furnace tube (10) and the third furnace tube (11) are made of SiC or corundum mullite.

7. The internal shielded microwave calcining furnace for bearing steel according to claim 1, characterized in that: A furnace door (15) is provided on the right side of the calcining furnace; the right end of the furnace door (15) is fixedly connected to the left end of the flange valve (17); a sealing sheet (16) is provided between the right end of the furnace door (15) and the flange valve (17) for sealing the furnace door (15).

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