High-voltage direct-input electric heating device

Abstract

The invention discloses a high-voltage direct-feed electric heating device, relates to the field of electric heating, solves the problem that an existing heat storage structure is poor in stability, and adopts the following scheme that the high-voltage direct-feed electric heating device comprises a heat exchange structure, a heating structure on the outer side of the heat exchange structure and a heating module serving as a main body of the heat exchange structure; an electric heater is arranged at the input end of the electric heating wire, and the heating module is a special magnesium oxide module; according to the high-voltage direct-input electric heating device, the heating module is made of a magnesium oxide material, the heat storage function is achieved, when valley electricity exists, heat is stored in the magnesium oxide module, meanwhile, the heat is taken out through circulation of a high-temperature-resistant circulating fan, heating is conducted through a heat exchange structure and a medium, and storage and discharging are achieved at the same time; when valley electricity does not exist, heating is stopped, heat is taken out through fan circulation and heated through a heat exchanger and a medium, heat release is achieved, if the valley electricity does not exist and heat needs to be increased when load changes, a direct heating mode can be started, and the requirement for continuity and stability is met.

Description

Technical Field

[0001] The present invention relates to the technical field of electric heating, and specifically to a high-voltage direct-in electric heating device. Background Art

[0002] At present, most of the heating devices of heating equipment are boilers. Existing boilers mostly use coal-fired boilers or heat storage electric boilers. Coal-fired boilers cause very serious air pollution, and there are relatively many heat losses during the heating process of coal combustion; heat storage electric boilers need to store heat in a heat storage body, and then heat the water medium through the heat stored in the heat storage body. Heat storage electric boilers do not directly heat the medium, resulting in a low electric energy conversion rate; in addition, heat storage electric boilers and coal-fired boilers occupy a large area and are troublesome to use;

[0003] After retrieval, in the application document with the patent application number 201822227973.5, a high-voltage resistance direct heating device is disclosed, which includes a furnace body, a heat exchanger, a circulating fan, and a high-voltage power supply system. The furnace body includes a shell, a heat insulation layer covering the inner wall of the shell, and a heating element arranged in the furnace body. The high-voltage power supply system provides current to the resistance wire in the heating element, and the resistance wire heats the cold air discharged by the circulating fan. The heated hot air enters the heat exchanger for heat exchange. The utility model directly converts electric energy into heat energy to directly heat the medium. Among them, high-voltage current is used, and flowing air is used as the heating medium. The medium is heated through the resistance wire, and the heated air exchanges heat in the heat exchanger, improving the electric energy conversion rate; the equipment of the utility model is simple, occupies a small area, is safe to use, uses air as the heating medium, and is heated by high voltage, which conforms to the concept of green environmental protection;

[0004] The above application document uses air as a medium to achieve the effect of electric heating. However, firstly, the method of using air as a medium has room for improvement in safety and relatively low efficiency. Secondly, its method of absorbing and storing heat energy through air flow has poor stability, and at the same time, the heat storage system is complex, making it difficult to adapt to explosion-proof environments, and the power transformation and distribution system is relatively complex.

[0005] Therefore, we propose a high-voltage direct-in electric heating device. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides a high-voltage direct-in electric heating device, which solves the problems that the existing devices are difficult to perform efficient electric heating and heat exchange according to requirements.

[0007] To achieve the above object, the present invention is realized by the following technical solutions: a high-voltage direct-current electric heating device, including a heat exchange structure and a heating structure outside it. The input end and the output end of the heat exchange structure are fixedly connected with an air inlet pipe and an air outlet pipe. The two ends of the heating structure are respectively fixedly connected with an air inlet pipe and an air outlet pipe. The outer end of the air inlet pipe is fixedly connected with the air outlet pipe. The outer end of the air outlet pipe is fixedly installed with a high-temperature resistant circulating fan, and the output end of the high-temperature resistant circulating fan is fixedly connected to the air inlet pipe;

[0008] The main body of the heating structure is a heating module. An electric heating wire is clamped inside the heating module. The input end of the electric heating wire is electrically connected to an electric heater, and the heating module is a special magnesium oxide module;

[0009] Among them, the setting of the magnesium oxide module has a heat storage function. When there is valley electricity, the heat is stored in the magnesium oxide module. At the same time, the heat is also taken out through the circulation of the high-temperature resistant circulating fan and heated with the medium through the heat exchange structure, realizing heat storage and release at the same time. When there is no valley electricity, the heating stops, and the heat is taken out through the circulation of the fan and heated with the medium through the heat exchanger, realizing heat release. For example, when there is no valley electricity and the load changes and more heat is needed, the direct heating mode can also be started to ensure continuous and stable requirements.

[0010] As a preferred scheme of the high-voltage direct-current electric heating device of the present invention, the heating module is a cylindrical module. A wire groove is opened on the inner side wall of the heating module. The wire groove is a semi-circular channel, and an electric heating wire is clamped inside the wire groove;

[0011] Among them, the setting of the wire groove shape is convenient for clamping the electric heating wire and ensuring the contact area between the electric heating wire and the heating module. When the electric heating wire is driven by the electric heater to be energized, the electric heating effect can be realized by using a large amount of contact between them, so that the whole heating module and the electric heating wire clamped therein are heated accordingly.

[0012] As a preferred scheme of the high-voltage direct-current electric heating device of the present invention, the electric heating wire is a spiral wire. The inner side wall of the electric heating wire is arranged inside the heating module, and the inner side wall of the electric heating wire is in contact with the air flow conducted in the heating module;

[0013] Among them, the clamping method between the electric heating wire and the heating module can ensure the contact area between it and the air flow inside the heat exchange structure, and use the moving air flow to take away the heat generated by the electric heating on the inner side wall of the heating module and the inner side wall of the electric heating wire, ensuring the heat conduction effect.

[0014] As a preferred scheme of the high-voltage direct-current electric heating device of the present invention, the heating structure further includes a protection module surrounding the outer wall of the heating module. The protection module is an insulating alloy module;

[0015] Among them, the enclosed assembly setting of the protection module enables the electric heating of the heating module inside it to be only converted into heat energy without loss to other forms of energy, increasing the electro-thermal conversion efficiency.

[0016] As a preferred embodiment of the high-voltage direct-in electric heating device of the present invention, the inner side walls of the heating wire are sleeved and contacted with the wire grooves therein through silicone grease;

[0017] Among them, the method of assembling the heating module and the heating wire through silicone grease can further ensure the heat conduction effect, so as to enable the airflow passing through it to quickly take away the heat generated by the electric heating on its inner wall.

[0018] As a preferred embodiment of the high-voltage direct-in electric heating device of the present invention, a temperature monitoring module is provided inside the heating module. The temperature monitoring module is connected to the controller through a wire, and the control panel of the high-temperature resistant circulating fan is also connected to the controller through a wire;

[0019] Among them, the setting of the temperature monitoring module facilitates real-time monitoring of the core temperature inside the heating structure. The internal temperature is set between 700 - 800 °C, and temperature control is adopted. When the temperature reaches 800 °C, the heating stops, and when the module temperature is lower than 700 °C, the heating starts.

[0020] As a preferred embodiment of the high-voltage direct-in electric heating device of the present invention, an air cavity and a capillary liquid tube stack distributed in a filling manner are provided inside the heat exchange structure. The input end of the capillary liquid tube stack is fixedly connected with a liquid inlet pipe, the output end of the capillary liquid tube stack is fixedly connected with a liquid discharge pipe, and the liquid inlet pipe, the liquid discharge pipe and the capillary liquid tubes are assembled through an air pump;

[0021] Among them, the setting of multiple groups of capillary liquid tubes inside the heat exchange structure can increase the contact area with the airflow in the inner cavity. At the same time, this inner cavity is connected to the air inlet pipe and the air discharge pipe, so as to facilitate the export of the high-temperature heat in the inner cavity airflow to the fluid in the capillary liquid tubes, enabling it to carry the heat and output it outward, achieving high-efficiency heat exchange efficiency.

[0022] As a preferred embodiment of the high-voltage direct-in electric heating device of the present invention, the airflow exported from the front end of the high-temperature resistant circulating fan is input into the heat exchange structure through the air inlet pipe, and is transported from the output end of the heat exchange structure to the heating structure through the air discharge pipe and the air inlet pipe, and then the airflow is re-transported to the high-temperature resistant circulating fan by the heating structure through the air discharge pipe;

[0023] Among them, the setting of the high-temperature resistant circulating fan, the air inlet pipe and the air discharge pipe can re-drive and transport the airflow after heat exchange in the heat exchange structure to the inside of the heat exchange structure, and then transport the high-temperature airflow from the heat exchange structure to the heating structure through the air discharge pipe and the air inlet pipe, realizing corresponding high-efficiency heat exchange.

[0024] As a preferred embodiment of the high-voltage direct-in electric heating device of the present invention, the air inlet pipe, the air intake pipe, the air outlet pipe, and the exhaust pipe are all composed of heat-insulating cotton and a high-temperature resistant pipe inside it, and a wire filter screen is arranged inside the high-temperature resistant pipe body;

[0025] Among them, the structures of the air inlet pipe, the air intake pipe, the air outlet pipe, and the exhaust pipe can maximize the reduction of heat leakage in the air flow, ensuring the heat conduction efficiency, and the wire filter screen is convenient for filtering and adsorbing impurities, further ensuring the conduction effect.

[0026] As a preferred embodiment of the high-voltage direct-in electric heating device of the present invention, the heating structure and the heat exchange structure are respectively connected to the cold water tank and the hot water tank through the liquid inlet pipe and the liquid discharge pipe;

[0027] Among them, the liquid inlet pipe and the liquid discharge pipe are convenient for discharging hot water and introducing cold water, ensuring the continuity of electric heating.

[0028] The present invention provides a high-voltage direct-in electric heating device, which has the following beneficial effects:

[0029] 1. For the high-voltage direct-in electric heating device, through the setting of the heating structure, by using the heating module and the shape of the wire groove, the corresponding high-efficiency heat conduction effect can be achieved through the shape setting. At the same time, the heat exchange structure can efficiently exchange heat with the high-temperature air flow derived, realizing efficient electric heating and subsequent heat conduction effects, and solving the problem that the existing device is difficult to perform efficient electric heating and heat exchange according to requirements;

[0030] 2. For the high-voltage direct-in electric heating device, by setting the heating module to be made of magnesium oxide material, it has a heat storage function. When there is off-peak electricity, the heat is stored in the magnesium oxide module, and at the same time, the heat is taken out through the circulation of the high-temperature resistant circulating fan and heated with the medium through the heat exchange structure, realizing heat storage and release at the same time; when there is no off-peak electricity, the heating stops, and the heat is taken out through the fan circulation and heated with the medium through the heat exchanger to realize heat release. For example, when there is no off-peak electricity and the load changes and additional heat is required, the direct heating mode can also be started to ensure continuous and stable requirements;

[0031] 3. For the high-voltage direct-in electric heating device, through the connection between the high-temperature resistant circulating fan and the air inlet pipe, the air intake pipe, the air outlet pipe, and the exhaust pipe, the corresponding hot air flow circulation can be realized between the heat exchange structure and the heating structure, so as to efficiently perform air flow circulation through the hot air flow for heat energy conversion to ensure subsequent continuous air flow heat exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the present invention;

[0033] Figure 2 Structural schematic diagram of the side view of the present invention;

[0034] Figure 3 Structural schematic diagram of the heat exchange structure of the present invention;

[0035] Figure 4 Structural schematic diagram of the heating structure of the present invention;

[0036] Figure 5 Structural schematic diagram of the inner side of the heating structure of the present invention;

[0037] Figure 6 Structural schematic diagram of the heating module of the present invention;

[0038] Figure 7 Structural schematic diagram of the inner side of the heating module of the present invention;

[0039] Figure 8 Structural schematic diagram of the heating wire of the present invention.

[0040] In the figure: 1. Heat exchange structure; 11. Heat exchanger; 12. Air pump; 13. Liquid inlet pipe; 14. Liquid discharge pipe; 2. Heating structure; 21. Protection module; 22. Heating module; 23. Electric heater; 24. Heating wire; 25. Wire groove; 3. High-temperature circulating fan; 4. Exhaust duct; 5. Air inlet duct; 6. Inlet air duct; 7. Outlet air duct. Specific embodiments

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] Please refer to Figure 1-8, an embodiment of the present invention provides a technical solution: a high-voltage direct-current electric heating device, which includes a heat exchange structure 1 and a heating structure 2 outside it. The input end and the output end of the heat exchange structure 1 are fixedly connected with an air inlet pipe 5 and an air discharge pipe 4. The two ends of the heating structure 2 are respectively fixedly connected with an air inlet pipe 6 and an air outlet pipe 7. The outer end of the air inlet pipe 5 is fixedly connected with the air outlet pipe 7. The outer end of the air discharge pipe 4 is fixedly installed with a high-temperature resistant circulation fan 3, and the output end of the high-temperature resistant circulation fan 3 is fixedly connected to the air inlet pipe 6; the main body of the heating structure 2 is a heating module 22, and an electric heating wire 24 is clamped inside the heating module 22. The input end of the electric heating wire 24 is electrically connected to an electric heater 23, and the heating module 22 is a special magnesium oxide module; among them, the setting of the magnesium oxide module has a heat storage function. When there is valley electricity, heat is stored in the magnesium oxide module, and at the same time, the heat is also taken out through the circulation of the high-temperature resistant circulation fan 3 and heated with the medium through the heat exchange structure 1 to realize heat storage and release at the same time; when there is no valley electricity, the heating stops, and the heat is taken out through the fan circulation and heated with the medium through the heat exchanger to realize heat release. For example, when there is no valley electricity and the load changes and heat needs to be increased, the direct heating mode can also be started to ensure continuous and stable requirements;

[0043] In addition, in this high-voltage direct-current electric heating device, through the setting of the structure of the heating structure 2, the shape of the heating module 22 and the wire groove 25 can be used to achieve a corresponding high-efficiency heat conduction effect through the shape setting. At the same time, the setting of the structure of the heat exchange structure 1 can efficiently exchange heat for the derived high-temperature air flow, realizing high-efficiency electric heating and subsequent heat conduction effects, and solving the problem that the existing device is difficult to perform high-efficiency electric heating and heat exchange according to requirements.

[0044] Embodiment 2:

[0045] The heating module 22 is a cylindrical module. A wire groove 25 is opened on the inner side wall of the heating module 22. The wire groove 25 is a semi-circular groove, and an electric heating wire 24 is clamped inside the wire groove 25; among them, the shape setting of the wire groove 25 is convenient for clamping the electric heating wire 24 and ensuring the contact area between the electric heating wire 24 and the heating module 22. When the electric heating wire 24 is driven by the electric heater 23 to be energized, the electric heating effect can be realized through a large amount of contact between them, so that the whole heating module 22 and the electric heating wire 24 clamped therein are heated accordingly.

[0046] The electric heating wire 24 is a spiral wire. The inner side wall of the electric heating wire 24 is arranged inside the heating module 22, and the inner side wall of the electric heating wire 24 is in contact with the air flow conducted in the heating module 22; among them, the clamping method between the electric heating wire 24 and the heating module 22 can ensure the contact area between it and the air flow inside the heat exchange structure 1, and use the moving air flow to take away the heat generated by electric heating on the inner side wall of the heating module 22 and the inner side wall of the electric heating wire 24 to ensure the heat conduction effect.

[0047] The heating structure 2 further includes a protection module 21 surrounding the outer wall of the heating module 22, and the protection module 21 is an insulating alloy module. Among them, the surrounding assembly setting of the protection module 21 enables the electric heating of the heating module 22 inside it to be only converted into heat energy without being lost as other forms of energy, increasing the electrothermal conversion efficiency.

[0048] The inner side walls of the heating wire 24 are sleeved and contacted with the wire groove 25 therein through silicone grease. Among them, the assembly method of the heating module 22 and the heating wire 24 through silicone grease can further ensure the heat conduction effect, so that the air flow passing through it can quickly take away the heat generated by the electric heating on its inner wall.

[0049] A temperature monitoring module is arranged inside the heating module 22. The temperature monitoring module is connected to the controller through a wire, and the control panel of the high-temperature resistant circulating fan 3 is also connected to the controller through a wire. Among them, the setting of the temperature monitoring module facilitates real-time monitoring of the core temperature inside the heating structure 2. The internal temperature is set between 700 - 800 °C. Temperature control is adopted. When the temperature reaches 800 °C, the heating stops. When the module temperature is lower than 700 °C, the heating starts.

[0050] Among them, this high-voltage direct-in electric heating device, through the setting of the heating module 22 using magnesium oxide material, has a heat storage function. When there is valley electricity, the heat is stored in the magnesium oxide module. At the same time, the heat is also taken out through the circulation of the high-temperature resistant circulating fan 3 and heated with the medium through the heat exchange structure 1 to achieve heat storage and release at the same time. When there is no valley electricity, the heating stops, and the heat is taken out through the circulation of the fan and heated with the medium through the heat exchanger to achieve heat release. For example, when there is no valley electricity and the load changes and additional heat is required, the direct heating mode can also be started to ensure continuous and stable requirements.

[0051] In addition, through the solid heat storage method of the heating module 22, the heat release temperature is less than 750 °C, and the heating method is resistance heating. It has the advantages of high heat storage temperature, low cost, high safety, simple system and low cost. In addition, it can be directly applied to high voltages such as 6KV / 10KV / 35KV / 66KV / 110KV and low voltages below 690V without voltage transformation, with strong power grid adaptability. Compared with the traditional method, the charging utilization rate improves the wind-solar utilization rate by 10 - 20%, and the comprehensive efficiency is 95%, with a greatly improved efficiency.

[0052] Embodiment 2:

[0053] Inside the heat exchange structure 1, there is an air cavity and a capillary liquid tube stack distributed in a filling manner therein. The input end of the capillary liquid tube stack is fixedly connected to a liquid inlet pipe 13, and the output end of the capillary liquid tube stack is fixedly connected to a liquid discharge pipe 14. The liquid inlet pipe 13, the liquid discharge pipe 14 and the capillary liquid tubes are assembled through an air pump 12. Among them, the setting of multiple groups of capillary liquid tubes inside the heat exchange structure 1 can increase the contact area with the air flow in the inner cavity. At the same time, this inner cavity is connected to the air inlet pipe 5 and the air discharge pipe 4, so as to facilitate the export of the high-temperature heat in the inner cavity air flow to the fluid in the capillary liquid tubes, enabling it to carry heat and output it outward, achieving high-efficiency heat exchange efficiency.

[0054] The air flow led out from the front end of the high-temperature resistant circulating fan 3 is input into the heat exchange structure 1 through the air inlet pipe 6, and is transported from the output end of the heat exchange structure 1 to the heating structure 2 through the air outlet pipe 7 and the air inlet pipe 5, and then the heating structure 2 transports the air flow back to the high-temperature resistant circulating fan 3 through the air discharge pipe 4. Among them, the setting of the high-temperature resistant circulating fan 3, the air inlet pipe 6 and the air discharge pipe 4 can drive the air flow after heat exchange in the heat exchange structure 1 to be transported back to the inside of the heat exchange structure 1 again, and then the high-temperature air flow is transported from the heat exchange structure 1 to the heating structure 2 through the air outlet pipe 7 and the air inlet pipe 5, realizing corresponding high-efficiency heat exchange.

[0055] The air inlet pipe 5, the air inlet pipe 6, the air outlet pipe 7 and the air discharge pipe 4 are all composed of heat insulation cotton and the high-temperature resistant pipe inside it, and a wire filter screen is arranged inside the high-temperature resistant pipe body. Among them, the setting of the structures of the air inlet pipe 5, the air inlet pipe 6, the air outlet pipe 7 and the air discharge pipe 4 can maximize the reduction of heat leakage in the air flow, ensure the heat conduction efficiency, and the setting of the wire filter screen is convenient for filtering and adsorbing impurities, further ensuring the conduction effect.

[0056] The heating structure 2 is connected to the cold water tank and the hot water tank respectively through the heat exchange structure 1 via the liquid inlet pipe 13 and the liquid discharge pipe 14. Among them, the setting of the liquid inlet pipe 13 and the liquid discharge pipe 14 is convenient for discharging hot water and introducing cold water, ensuring the continuity of electric heating.

[0057] In addition, for this high-voltage direct input electric heating device, through the connection between the high-temperature resistant circulating fan 3 and the air inlet pipe 5, the air inlet pipe 6, the air outlet pipe 7 and the air discharge pipe 4, the corresponding hot air flow circulation can be realized between the heat exchange structure 1 and the heating structure 2, so as to carry out corresponding high-efficiency air flow circulation for heat energy conversion through this hot air flow, to ensure the subsequent continuous air flow heat exchange.

[0058] Furthermore, it should be noted that the cooperation between the heat exchange structure 1 and the heating structure 2 can achieve the following advantages:

[0059] High safety: The heating components are sealed in the module. Through the exchange of hot air and heating medium, water and electricity are separated, and the safety is high;

[0060] Heat release on demand and energy conservation: The outlet temperature of the heat exchanger is adjusted by a variable-frequency fan to maintain the temperature at the load end. After reaching the set temperature, heat release stops.

[0061] Strong pressure-bearing capacity: The heat exchanger adopts a serpentine tube type, and the pressure can be designed and manufactured according to the load end. 4 High-voltage direct input, higher efficiency and less investment;

[0062] At the same time, traditional heaters use a 0.4kV voltage for heating, which requires adding a 10kV / 0.4kV transformer and related low-voltage switchgear supporting devices. After passing through the transformer, the efficiency decreases, the wire diameter of the used wire is large, and the electrical loss is large. Compared with low-voltage power distribution, the current of high-voltage direct input equipment is small, the electrical loss is low, the wire diameter of the used wire is small, and the efficiency is higher than that of 0.4kV power distribution; This application document can adopt high-voltage direct input. At the same time, high-voltage direct input can reduce the cost of low-voltage power transformation and distribution, and greatly reduce the investment;

[0063] Low operating cost and less maintenance cost: The regenerative heating device has a full heat storage function, which can ensure the use of cheap electricity prices such as valley electricity throughout the day. Except for a small amount of heating wires, there is very little content that needs to be repaired for the regenerative boiler.

[0064] The working principle and usage process of the present invention: Electric current is passed through the electric heater 23 in the heating structure 2 to the heating wire 24, and it generates heat under the influence of the current. By using the setting of its contact with the heating module 22, high-efficient heat generation efficiency can be ensured to drive the heating module 22 to generate heat. Then, the high-temperature resistant circulation fan 3 on the outside transmits the air flow through the air inlet pipe 6 to the inside of the heat exchange structure 1. This air flow contacts the inner wall of the heating wire 24 and the inner wall of the heating module 22, and the heat on them is carried away by the driven air flow and transmitted through the air inlet pipe 5 and the air outlet pipe 7 to the inner cavity of the heating structure 2. At the same time, the setting of the liquid inlet pipe 13 and the liquid discharge pipe 14 facilitates the conduction of the liquid flow to the capillary liquid pipe inside the heating structure 2 to ensure its contact effect and heat exchange efficiency with the high-temperature air flow in the inner cavity. Finally, the heating structure 2 exports the air flow through the air discharge pipe 4 to the inside of the high-temperature resistant circulation fan 3 to realize the circular conduction of the air flow, and also conducts efficient waste heat utilization on the low-temperature air flow to further ensure the heat exchange efficiency.

[0065] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0066] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. High voltage direct electric heating device, characterized by: It comprises a heat exchange structure (1) and a heating structure (2) outside thereof, wherein the input end and the output end of the heat exchange structure (1) are fixedly connected to an air inlet pipe (5) and an air outlet pipe (4), the two ends of the heating structure (2) are respectively fixedly connected to an air inlet pipe (6) and an air outlet pipe (7), the outer end of the air inlet pipe (5) is fixedly connected to the air outlet pipe (7), the outer end of the air outlet pipe (4) is fixedly installed with a high-temperature resistant circulation fan (3), and the output end of the high-temperature resistant circulation fan (3) is fixedly connected to the air inlet pipe (6); The main body of the heating structure (2) is a heating module (22), an electric heating wire (24) is mounted on the inner side of the heating module (22), an input end of the electric heating wire (24) is electrically connected to an electric heater (23), and the heating module (22) is a special magnesium oxide module.

2. The high voltage direct current electric heating device according to claim 1 is characterized in that: The heating module (22) is a cylindrical module. A wire groove (25) is provided on the inner wall of the heating module (22). The wire groove (25) is a semicircular groove, and an electric heating wire (24) is clamped inside the wire groove (25).

3. The high voltage direct current electric heating device according to claim 2 is characterized in that: The heating wire (24) is a spiral wire, the inner side wall of the heating wire (24) is arranged on the inner side of the heating module (22), and the inner side wall of the heating wire (24) is in contact with the airflow conducted in the heating module (22).

4. The high voltage direct current electric heating device according to claim 1 is characterized in that: The heating structure (2) also includes a protection module (21) surrounding the outer wall of the heating module (22), and the protection module (21) is an insulating alloy module.

5. The high voltage direct current electric heating device according to claim 1 is characterized in that: The inner side walls of the heating wire (24) are fitted and in contact with the wire groove (25) therein via silicone grease.

6. The high voltage direct current electric heating device according to claim 1 is characterized in that: A temperature monitoring module is arranged inside the heating module (22), and the temperature monitoring module is connected to the controller via a wire. The control panel of the high temperature resistant circulation fan (3) is also connected to the controller via a wire.

7. The high voltage direct current electric heating device according to claim 1 is characterized in that: The heat exchange structure (1) is provided with an air cavity and a capillary tube stack arranged in a filling manner therein, the input end of the capillary tube stack is fixedly connected to a liquid inlet pipe (13), the output end of the capillary tube stack is fixedly connected to a liquid discharge pipe (14), and the liquid inlet pipe (13), the liquid discharge pipe (14) and the capillary tubes are assembled via an air pump (12).

8. The high voltage direct current electric heating device according to claim 1 is characterized in that: The airflow outputted from the front end of the high temperature resistant circulation fan (3) is input into the heat exchange structure (1) through the air inlet pipe (6), and is transported from the output end of the heat exchange structure (1) through the air outlet pipe (7) and the air inlet pipe (5) to the heating structure (2), and then the heating structure (2) transports the airflow back to the high temperature resistant circulation fan (3) through the exhaust pipe (4).

9. The high voltage direct current electric heating device according to claim 1, characterized in that: The air inlet pipe (5), the air inlet pipe (6), the air outlet pipe (7) and the exhaust pipe (4) are all composed of thermal insulation cotton and a high-temperature resistant pipe inside thereof, and a steel wire filter is arranged inside the high-temperature resistant pipe body.

10. The high voltage direct current electric heating device according to claim 1, characterized in that: The heating structure (2) is connected to the cold water tank and the hot water tank respectively through the heat exchange structure (1) via a liquid inlet pipe (13) and a liquid discharge pipe (14).

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