A circuitous multi-channel electromagnetic heating hot blast stove

Abstract

The present application relates to a kind of detours multi-channel electromagnetic heating hot blast furnace, including heating pipe, high-frequency wire, inner heating fin, outer spiral piece, inner air outlet cylinder and outer insulation cylinder;The outer side of heating pipe is provided with insulation layer, high-frequency wire is spirally wound outside the insulation layer, inner air outlet cylinder is arranged in heating pipe with interval, and is fixedly connected with heating pipe using circumferential array distribution inner heating fin;Outer spiral piece is fixed outside high-frequency wire, and outer spiral piece, heating pipe and outer insulation cylinder form spiral preheating channel, heating pipe, inner air outlet cylinder and inner heating fin form heating channel, and inner air outlet cylinder forms air outlet channel;Sealing plate is provided at both ends of outer insulation cylinder, sealing plate is provided with air inlet pipe, one end of heating air duct is communicated with preheating channel, and the other end is communicated with air outlet channel.The present application uses electromagnetic induction principle, and the thermal efficiency of hot blast furnace is as high as 99% or more, compared with traditional hot blast furnace, can save a lot of energy cost, safe and reliable, environmentally friendly and clean.

Description

Technical Field

[0001] This invention relates to the field of hot blast stove technology, and specifically to a meandering multi-channel electromagnetic heating hot blast stove. Background Technology

[0002] Hot air furnaces, as a type of thermal machinery, have become a substitute for electric heat sources and traditional steam power sources in many industries. Through long-term production practice, it has been recognized that only by using hot air as a medium and carrier can thermal efficiency and thermal performance be greatly improved. With the development of electromagnetic induction technology, electromagnetically heated hot air furnaces are increasingly being developed. Industrial electromagnetic heaters are now a popular product in the industrial heating field due to their numerous advantages, including energy saving, environmental friendliness, stability, and safety.

[0003] An electromagnetic high-temperature hot air furnace is a device that converts electrical energy into heat energy using the principle of electromagnetic induction. Its core component is an electromagnetic controller, which rectifies 220V, 50 / 60Hz AC power into DC power, and then converts the DC power into high-frequency, high-voltage electricity with a frequency of 20-40kHz. When this high-frequency, high-voltage current flows through the coil, it generates a rapidly changing alternating magnetic field. When the magnetic lines of force within this field pass through a magnetically conductive metal material, countless small eddy currents are generated within the metal, causing the metal material itself to heat up rapidly, thereby heating the material inside the metal cylinder.

[0004] Electromagnetic high-temperature hot air furnaces have many advantages. First, they have a large heat exchange area and produce hot air quickly, directly heating the air, while remaining relatively small in size and easy to connect to air ducts. Second, they employ electromagnetic induction heating technology, with an insulator between the wires and the furnace body. Heating relies on the collision between the magnetic field and iron, resulting in no open flame, no electrical leakage, and high safety performance. Furthermore, electromagnetic high-temperature hot air furnaces are highly energy-efficient, saving 30-60% of energy.

[0005] Electromagnetic high-temperature hot air furnaces can be widely used in chemical, aquaculture, coal mining, rubber, food, catering, forestry, paper, automotive, and other industries that use hot air drying methods. Compared with traditional boilers and hot air drying methods in these industries, electromagnetic high-temperature hot air furnaces have higher thermal efficiency and better environmental performance.

[0006] However, existing electromagnetic hot air furnaces only use a single channel in their structure, with the air source directly entering the single channel for heating. The heating stroke is relatively short, which requires increasing the density of the electromagnetic array or increasing the power to obtain a better electromagnetic heating effect, thus limiting their application. In addition, the high-frequency conductors also generate a little heat during this process, which is directly dissipated. If this heat were used to preheat the air, it would not only reduce the conductor temperature but also achieve air preheating, resulting in a better effect. Based on this, it is necessary to study a circuitous multi-channel electromagnetic heating hot air furnace. Summary of the Invention

[0007] Therefore, the purpose of this invention is to provide a multi-channel electromagnetic heating hot air furnace that effectively solves the problems of existing hot air furnaces, which rely heavily on heating stroke or increasing heating tools for heating effect, resulting in long size, large footprint, and easy overheating of high-frequency wires.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a multi-channel electromagnetic heating hot air furnace, comprising a heating tube, a high-frequency conductor, inner heating fins, outer spiral fins, an inner air outlet duct, and an outer insulation cylinder; an insulation layer is provided on the outside of the heating tube, the high-frequency conductor is spirally wound around the outside of the insulation layer and connected to an external frequency conversion heating control device, the inner air outlet duct is spaced inside the heating tube and is fixedly connected to the heating tube by the evenly distributed inner heating fins in a circumferential array; the outer spiral fins are fixed on the outside of the high-frequency conductor, and the outer insulation cylinder is fixed outside the high-frequency conductor to form external protection, a spiral preheating channel is formed between the outer spiral fins, the heating tube, and the outer insulation cylinder, a heating channel is formed between the heating tube, the inner air outlet duct, and the inner heating fins, and an air outlet channel is formed inside the inner air outlet duct; sealing plates are provided at both ends of the outer insulation cylinder, the sealing plates are provided with air inlet pipes communicating with the preheating channel, one end of the heating air duct is communicating with the preheating channel, and the other end is communicating with the air outlet channel.

[0009] Furthermore, a fixing base is fixed to the outside of the high-frequency conductor, and the outer spiral plate is fixed on the fixing base.

[0010] Furthermore, there are gaps between the high-frequency conductors of the outer spiral plate.

[0011] Furthermore, the sealing plate includes an air inlet end plate and an air outlet end plate, wherein the air outlet end plate is provided with an air outlet adapted to the inner air outlet duct, and the air inlet end plate seals this side.

[0012] Furthermore, the heating tube and the inner air outlet are fixed to the air outlet end plate and the air inlet end plate respectively by connecting rods or ribs.

[0013] Furthermore, the heating air duct is connected to the air outlet duct through a transition air duct. The transition air duct includes a baffle and a cover. The cover is provided with an arc-shaped transition surface. The baffle corresponds one-to-one with the inner heating fins and guides each sub-heating air duct to the inner air outlet duct.

[0014] Furthermore, an air inlet area is provided at the air inlet end of the outer insulation cylinder, and the cover is located within the air inlet area.

[0015] Furthermore, temperature sensors are installed in the preheating channel, heating channel, and air outlet channel to measure the temperature in the preheating channel, heating channel, and air outlet channel, respectively.

[0016] Furthermore, the variable frequency heating control device includes a variable frequency heating controller and a temperature acquisition unit. The temperature acquisition unit is used to collect the temperature of the temperature sensors in the preheating channel, heating channel and air outlet channel, and upload the temperature to the variable frequency heating controller, which then controls the input adjustment of the fan and high-frequency conductor.

[0017] Furthermore, an insulation layer is provided on the outer side of the outer insulation cylinder.

[0018] The beneficial effects of the above technical solution are as follows: This invention aims to provide an electromagnetic induction hot air furnace, which is a device that uses the principle of electromagnetic induction for heating. Its core principle is to generate eddy currents inside metal materials through electromagnetic induction, thereby rapidly heating them. Compared with traditional hot air furnaces, electromagnetic induction hot air furnaces have higher thermal efficiency, are safer and more reliable, and have better environmental performance.

[0019] Simultaneously, during the process, the present invention first injects air into a meandering preheating channel. This channel allows the air to flow along the arrangement direction of the high-frequency conductors (a spiral meandering direction), ensuring that the air fully contacts the high-frequency conductors and carries away the heat generated on their surface, thus preventing the high-frequency conductors from overheating. At the same time, the generated heat can be used to preheat the air, preventing the air temperature from being too low and stimulating the heating element, thus providing a better foundation for heating.

[0020] In the heating stage, the present invention uses electromagnetic heating to generate heat in the heating tube placed in the high-frequency conductor, and uses the internal heating fins to divide different sub-spaces to ensure that the air is in contact with the heating tube and the internal heating fins, thus ensuring the heating effect, and then enters the internal air outlet duct for discharge.

[0021] Therefore, this invention uses concentrically arranged multi-layer channels to achieve air preheating, heating, and exhaust. Within a short stroke, the preheating of heated air is achieved through the meandering channels. It fully utilizes the heat generated by electromagnetic heating on the internal heating tubes, greatly improving energy efficiency. Using the principle of electromagnetic induction, the thermal efficiency of the hot air furnace is as high as 99% or more. Compared with traditional hot air furnaces, it can save a lot of energy costs. It is safe, reliable, environmentally friendly, and clean. The electromagnetic induction hot air furnace uses clean energy, with no combustion process, no exhaust gas emissions, and no noise pollution, making the operation of the hot air furnace more environmentally friendly and clean. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the air outlet structure; Figure 3 This is a schematic diagram of the implementation structure of the air inlet duct; Figure 4 This is a schematic diagram of the internal cross-sectional structure of the present invention; Figure 5 This is a schematic diagram of the internal vertical section structure of the present invention; Figure 6 This is a schematic diagram of the preheating channel structure; Figure 7 for Figure 6 Front view structural diagram; Figure 8 for Figure 6 A schematic diagram of the side view structure; Figure 9 for Figure 6 A cross-sectional structural schematic diagram; Figure 10 This is a schematic diagram of the transition air duct structure; Figure 11 This is a schematic diagram of the exterior of the transition air duct; Figure 12 This is a schematic diagram of the internal structure of the transition air duct; Figure 13 This is a system flowchart for electromagnetic heating temperature control.

[0023] Attached reference numerals: 1-fan, 2-inlet pipe, 3-outer insulation cylinder, 4-outer spiral blade, 5-high frequency wire, 6-heating tube, 7-inner outlet pipe, 8-preheating channel, 9-heating channel, 10-outlet channel, 11-inlet end plate, 12-outlet end plate, 13-inner heating fins, 14-fixed base, 15-arc baffle, 16-transition air duct, 17-straight baffle, 18-cover. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Example 1: This example aims to provide a meandering multi-channel electromagnetic heating hot air furnace, mainly used for electromagnetic heating hot air furnaces. It addresses the problem that existing electromagnetic heating hot air furnaces rely on heating stroke or increasing heating tools for heating effect, resulting in long size and large footprint. Furthermore, air is directly introduced without preheating during use. Based on this, this example provides a meandering multi-channel electromagnetic heating hot air furnace.

[0025] This embodiment provides a multi-channel electromagnetic heating hot air furnace, including a heating tube 6, a high-frequency wire 5, inner heating fins 13, outer spiral blades 4, an inner air outlet duct 7, and an outer insulation cylinder 3; as shown... Figure 1-3 As shown in the diagram, the structure uses a fan 1 to supply air, which enters from one side and has an air outlet on the other side, from which heated air is discharged. The air is heated through a meandering channel inside. The structure has air inlet and air outlet on opposite sides and a reasonable internal layout. This structure is just one example of the structure in this embodiment. The structure can be built into a box or some support structure can be added to the structure. These are all simple variations of this embodiment. For example, the structure can be applied to a square box and supports or mobile devices can be added to the outside of the box to achieve fixed installation or mobile assembly of the device.

[0026] In the internal structure, this embodiment has an insulation layer on the outside of the heating tube 6. A high-frequency conductor 5 is spirally wound around the insulation layer and connected to an external frequency conversion heating control device. This frequency conversion heating control device is existing technology; it rectifies 220V, 50 / 60Hz AC power into DC power, and then converts the DC power into high-frequency, high-voltage electricity with a frequency of 20-40kHz. When the high-frequency, high-voltage current flows through the coil, it generates a rapidly changing alternating magnetic field. When the magnetic lines of force within the magnetic field pass through the magnetically conductive metal material, countless small eddy currents are generated within the metal, causing the metal material itself to heat up rapidly. This heats the material inside the metal cylinder, thus heating the internal heating tube 6 to generate heat.

[0027] like Figure 4-9 As shown in the figure, in this embodiment, the internal air outlet duct 7 is arranged at intervals inside the heating tube 6, and is fixedly connected to the heating tube 6 by the internal heating fins 13 evenly distributed in a circumferential array; the internal heating fins 13 are heat dissipation materials, which can absorb the heat generated by the heating tube 6 and disperse the heat through the internal heating fins 13, ensuring that the air and heat source are fully connected and improving the heating effect. At the same time, the internal air outlet duct 7 can also be a heat dissipation material, and the purpose of multiple heating is achieved by using a meandering channel.

[0028] like Figure 5As shown, the outer spiral blade 4 is fixed to the outside of the high-frequency conductor 5, and the outer insulation cylinder 3 is fixed to the outside of the high-frequency conductor 5 to form external protection. An insulation layer is provided on the outside of the outer insulation cylinder 3 to reduce heat loss.

[0029] Structurally, the outer insulation cylinder 3 and heating pipe 6 are circular tube structures, the inner heating fins 13 are plate structures, and the inner air outlet duct 7 is a cylindrical structure. This structure enables the multi-layered and meandering arrangement of the air duct, forming multiple cavities with annular structures in the entire space, which guides the air circulation.

[0030] like Figure 9 As shown, a spiral preheating channel is formed between the outer spiral blade 4, the heating tube 6, and the outer insulation cylinder 3. A heating channel is formed between the heating tube 6, the inner air outlet duct 7, and the inner heating fins 13. An air outlet channel is formed inside the inner air outlet duct 7. Sealing plates are provided at both ends of the outer insulation cylinder 3. The sealing plates are provided with air inlet pipes 2 that are connected to the preheating channel. The air inlet pipes are connected to the fan to realize the input of the air source and provide power for the flow of the air source. One end of the heating air duct is connected to the preheating channel, and the other end is connected to the air outlet channel.

[0031] In terms of implementation structure, such as Figure 4 As shown, the sealing plate includes an air inlet plate 11 and an air outlet plate 12. The air outlet plate 12 is provided with an air outlet adapted to the inner air outlet duct 7. The air inlet plate 11 blocks this side. The heating pipe 6 and the inner air outlet duct 7 are fixed to the air outlet plate 12 and the air inlet plate 11 respectively by connecting rods or ribs. This allows air to flow through the space formed by the connecting rods or ribs, meandering from one channel to another.

[0032] This embodiment achieves multi-channel, circuitous heating of air, improving heating efficiency while reducing heat loss. It offers advantages such as energy saving and environmental protection. Air enters through a circuitous preheating channel and flows along the arrangement direction of the high-frequency conductors, ensuring full contact with them. The air cools the high-frequency conductors and carries away heat, while simultaneously preheating the air using the heat generated by the high-frequency conductors. After preheating, the air returns to the heating channel, where it undergoes multi-zone heating. Finally, it exits through the circuitous inner air outlet duct 7. Within a short travel distance, the circuitous channel facilitates the circulation and preheating of heated air, fully utilizing the heat generated by the electromagnetic heating element 6. This significantly improves energy efficiency. Employing the principle of electromagnetic induction, the hot air furnace achieves a thermal efficiency of over 98%, saving substantial energy costs compared to traditional hot air furnaces. It is safe, reliable, environmentally friendly, and clean. The electromagnetic induction hot air furnace uses clean energy, eliminating combustion, exhaust emissions, and noise pollution, making its operation more environmentally friendly and cleaner.

[0033] Example 2 further illustrates the installation structure of the high-frequency conductor 5.

[0034] In this embodiment, as shown Figure 5 As shown, a mounting base 14 is fixed to the outside of the high-frequency conductor 5. The fixing method can be screw fixing or welding to the outside of the high-frequency conductor or heating tube. The mounting base has a linear structure, specifically with corresponding heating fins arranged, and the outer spiral blade 4 is fixed to the mounting base. There is a gap between the outer spiral blade 4 and the high-frequency conductor 5. This structure allows air to pass through the gap and correspond to each sub-heating zone.

[0035] In this embodiment, a fixed base is used to assemble the outer spiral blade, which is fixed to the fixed base 14 by spot welding. The fixed base 14 protrudes from the high-frequency conductor 5 in structure. This structure has the following characteristics: air can not only flow along the spiral channel, but also flow in a straight line from the space close to the high-frequency conductor 5. Thus, in this embodiment, the preheating air can not only pass through the spiral of the high-frequency conductor 5, but also pass through the length of the high-frequency conductor 5, so as to achieve efficient preheating of the air.

[0036] Example 3 further illustrates the internal structure of the heating air duct.

[0037] In this embodiment, as Figure 10-12 As shown, the heating channel 9 is connected to the air outlet channel 10 via a transition air duct 16. The transition air duct 16 includes a baffle and a cover 18. In specific implementations, the baffle includes an arc-shaped baffle 15 and a straight baffle 17. The arc-shaped baffle is used to adapt to the upper arc-shaped surface inside the arc-shaped cover 18, and the straight baffle is located inside the air outlet channel to guide the extension of the rear airflow. An arc-shaped transition surface is provided inside the cover 18. The baffle corresponds one-to-one with the inner heating fins 13 and guides each sub-heating air duct to the inner air outlet duct 7. An air inlet area is provided at the air inlet end of the outer insulation cylinder 3, and the cover is located within the air inlet area.

[0038] In this embodiment, the cover will inevitably emit heat. In order to collect this heat, it is placed in the air intake area and the cover is on the air intake side. The emitted heat can be used to preheat the air, thereby further collecting and utilizing energy and improving energy utilization. According to statistics, the utilization rate of the electromagnetic heating heat source in this embodiment reaches more than 90%.

[0039] For multiple sub-heating air ducts entering a single air outlet duct, the transition air duct 16 arranged in this embodiment can guide the air source of each sub-air duct to be discharged in a straight line and converge at the straight section, avoiding backflow and air source impact, and reducing wind speed.

[0040] This embodiment uses electromagnetic heating, which has the advantages of high efficiency, energy saving and environmental protection; by setting up preheating channel and heating channel, multi-stage heating of air is realized, improving heating efficiency and uniformity; by setting up transition air duct, uniform distribution and guidance of hot air is realized, improving the utilization rate of hot air.

[0041] Example 3 further illustrates the variable frequency heating control equipment.

[0042] In this embodiment, temperature sensors are installed in the preheating channel, heating channel, and air outlet channel to measure the temperature in each channel, thereby obtaining the preheating temperature, heating temperature, and actual air outlet temperature. This allows for the corresponding control of the high-frequency conductor 5 and the fan power to regulate the heating effect.

[0043] In this embodiment, the variable frequency heating control device includes a variable frequency heating controller and a temperature acquisition unit. The temperature acquisition unit is used to collect the temperature of the temperature sensors in the preheating channel, heating channel and air outlet channel, and upload the temperature to the variable frequency heating controller, which then controls the input adjustment of the fan and the high-frequency wire 5.

[0044] By setting up temperature sensors and variable frequency heating control equipment, intelligent control and regulation of the hot air furnace were achieved, improving the stability and reliability of the equipment.

[0045] Specific control methods such as Figure 13 As shown, the preheating temperature is obtained, and the air intake power is adjusted sequentially to obtain the heating and air outlet temperatures, which are used to precisely control the input of the frequency converter. As for the specific control method, it is existing technology. The controller adjusts the heating input through temperature feedback. For example, the system may include modules such as distillation module, trigger circuit, overcurrent control, timing control, temperature control, and voltage and current stabilization.

[0046] The embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. The basic concept of the present invention is to first inject air into a meandering preheating channel. This channel allows the air to flow along the arrangement direction of the high-frequency conductors (a spiral meandering direction), ensuring that the air fully contacts the high-frequency conductors and carries away the heat generated on their surface, preventing the high-frequency conductors from overheating. Simultaneously, the generated heat can be used to preheat the air, preventing the air temperature from being too low and stimulating the heating element, thus providing a better foundation for heating. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A circuitous multi-channel electromagnetic heating hot air furnace, characterized in that: The device includes a heating element, a high-frequency conductor, inner heating fins, an outer spiral fin, an inner air outlet, and an outer insulation cylinder. An insulation layer is provided on the outside of the heating element. The high-frequency conductor is spirally wound around the insulation layer and connected to an external frequency conversion heating control device. The inner air outlet is spaced within the heating element and is fixedly connected to the heating element using a circumferentially arrayed inner heating fin. The outer spiral fin is fixed to the outside of the high-frequency conductor, and the outer insulation cylinder is fixed to the outside of the high-frequency conductor to form external protection. A spiral preheating channel is formed between the outer spiral fin, the heating element, and the outer insulation cylinder. A heating channel is formed between the heating element, the inner air outlet, and the inner heating fins. An air outlet channel is formed inside the inner air outlet. Sealing plates are installed at both ends of the outer insulation cylinder. The sealing plates are equipped with air inlet pipes that are connected to the preheating channel. One end of the heating air duct is connected to the preheating channel, and the other end is connected to the air outlet channel.

2. The circuitous multi-channel electromagnetic heating hot air furnace according to claim 1, characterized in that: The high-frequency conductor is fixed to a mounting base on its outer side, and the outer spiral plate is fixed to the mounting base.

3. The circuitous multi-channel electromagnetic heating hot air furnace according to claim 2, characterized in that: The outer spiral plate has gaps between the high-frequency conductors.

4. The circuitous multi-channel electromagnetic heating hot air furnace according to claim 1, characterized in that: The sealing plate includes an air inlet plate and an air outlet plate, wherein the air outlet plate is provided with an air outlet adapted to the inner air outlet duct, and the air inlet plate blocks this side.

5. The circuitous multi-channel electromagnetic heating hot air furnace according to claim 4, characterized in that: The heating element and the inner air outlet are fixed to the air outlet plate and the air inlet plate respectively by connecting rods or ribs.

6. The circuitous multi-channel electromagnetic heating hot air furnace according to claim 1, characterized in that: The heating air duct is connected to the air outlet duct through a transition air duct. The transition air duct includes a baffle and a cover. The cover has an arc-shaped transition surface. The baffle corresponds one-to-one with the inner heating fins and guides each sub-heating air duct to the inner air outlet duct.

7. The circuitous multi-channel electromagnetic heating hot air furnace according to claim 6, characterized in that: An air inlet area is provided at the air inlet end of the outer insulation cylinder, and the cover is located within the air inlet area.

8. The circuitous multi-channel electromagnetic heating hot air furnace according to claim 1, characterized in that: Temperature sensors are installed in the preheating channel, heating channel, and air outlet channel, respectively, to measure the temperature in the preheating channel, heating channel, and air outlet channel.

9. The circuitous multi-channel electromagnetic heating hot air furnace according to claim 8, characterized in that: The variable frequency heating control equipment includes a variable frequency heating controller and a temperature acquisition unit. The temperature acquisition unit is used to collect the temperature of the preheating channel, heating channel and air outlet channel from the temperature sensors, and upload the temperature to the variable frequency heating controller, which then controls the input adjustment of the fan and high-frequency conductor.

10. The circuitous multi-channel electromagnetic heating hot air furnace according to claim 1, characterized in that: An insulation layer is provided on the outside of the outer insulation cylinder.

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