Electric heating device and heating method

Abstract

The invention relates to the technical field of electric heaters, and discloses an electric heating device and a heating method.The electric heating device comprises a shell and heating modules, the shell forms a heating chamber with an air inlet and an air outlet, the heating modules are arranged in the heating chamber, and the multiple heating modules are arranged at intervals in the airflow direction; wherein the heating module comprises a supporting frame, supporting rods and a resistance wire, the multiple supporting rods are arranged on the supporting frame at intervals, the supporting rods extend in the direction perpendicular to the airflow direction, the supporting rods are spirally sleeved with the resistance wire, and the resistance wire is used for being connected with a high-voltage power source. On the other hand, the resistance wire directly exchanges heat with the air in the heating process, the heating rate of the air can be effectively improved, the surface temperature of the resistance wire is reduced, the resistance wire is arranged in the mode perpendicular to the airflow direction, and therefore the service life of the resistance wire is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of electric heaters, and in particular to an electric heating device and a heating method. Background Art

[0002] An electric heating device is a device that converts electrical energy into thermal energy and then heats the air. It has the advantages of convenient energy supply, compact structure, easy installation and maintenance, and no pollution. It has been widely used in industrial production, commercial places, agricultural fields, etc.

[0003] In order to obtain higher heating power, it is necessary to connect high voltage to the electric heating device. However, in the related art, the heating element often uses an electric heating tube, which is mainly composed of an external protective sleeve, an internal heating resistance wire and protective insulating magnesium oxide powder. The use of the sleeve and magnesium oxide powder will increase the heat transfer resistance of the resistance wire. When the heating power is high and the air flow rate outside the electric heating tube is low, the large surface heat load can easily cause the resistance wire to fuse, affecting the use of the equipment. Summary of the invention

[0004] In view of this, the present invention provides an electric heating device and a heating method to solve the problem of resistance wire fusing under high heating power.

[0005] In a first aspect, the present invention provides an electric heating device, comprising a shell and a heating module, wherein the shell forms a heating chamber having an air inlet and an air outlet, the heating module is arranged in the heating chamber, and a plurality of the heating modules are arranged at intervals along the airflow direction; wherein the heating module comprises a support frame, a support rod and a resistance wire, a plurality of the support rods are arranged at intervals on the support frame, the support rods extend in a direction perpendicular to the airflow direction, the resistance wire is spirally sleeved on the support rod, and the resistance wire is used to connect to a high-voltage power supply.

[0006] Beneficial effects: The gas flows from the air inlet to the air outlet, thereby forming a directional airflow in the heating chamber. The resistance wire heats the surrounding gas under high pressure and converts electrical energy into thermal energy. The low-temperature gas entering from the air inlet is transformed into high-temperature gas that meets the temperature requirements through step-by-step heating by multiple heating modules and is delivered to downstream users. On the one hand, the resistance wire is connected with high voltage, which can improve the heating power of the electric heating device and is conducive to large-scale promotion. On the other hand, the resistance wire directly exchanges heat with the air during the heating process, which can effectively increase the heating rate of the air and reduce the surface temperature of the resistance wire through the flow of airflow, thereby reducing the risk of the resistance wire fusing. The resistance wire is arranged perpendicular to the airflow direction, which helps to make the temperature on the surface of the resistance wire uniform and reduce the risk of damage, thereby increasing the service life of the resistance wire.

[0007] In an optional embodiment, the heating power of the heating module is configured to decrease sequentially along the air flow direction.

[0008] Beneficial effects: On the side close to the air inlet, the gas temperature is relatively low, and using a higher heating power helps to convert more electrical energy into thermal energy. On the side close to the air outlet, the gas temperature is close to or reaches the target temperature, so only a lower heating power is needed. By reasonably allocating the heating power of the electric heating device, the gas can be heated more efficiently.

[0009] In an optional implementation, the resistance wires are divided into three groups, the three groups of resistance wires are respectively used to connect to phase A, phase B, and phase C of the high voltage power supply, and the resistance wires in the same group are connected in series.

[0010] Beneficial effect: The three-phase connection method makes the heating module suitable for access to three-wire high-voltage alternating current, meeting the requirements for the electric heating device to operate under high voltage. The resistance wires of the same phase are connected in series, thereby reducing the heating power of a single resistance wire and reducing the risk of the resistance wire fusing under high voltage.

[0011] In an optional embodiment, a heat storage module is further included, and the heat storage module is arranged between two adjacent heating modules. The heat storage module is formed with a flow hole that passes through along the air flow direction.

[0012] Beneficial effects: The gas heated by the upstream heating module passes through the flow hole and flows to the next heating module. First, the heat storage module can absorb part of the heat from the gas and reversely heat the gas when the heating module fluctuates or fails, which plays a buffering role and helps to maintain the stability of the gas temperature at the outlet. Secondly, the heat storage module also has an insulating effect, enhancing the insulation performance between adjacent heating modules, which helps to ensure the reliability of the electric heating device under high pressure. Finally, the flow hole also has a diversion effect, making the air flowing to the next heating module more uniform.

[0013] In an optional implementation, the heat storage capacity of the heat storage module gradually increases along the air flow direction.

[0014] Beneficial effect: During the heating process, the temperature of the gas gradually increases along the direction of the airflow. By rationally allocating the heat storage capacity and setting more heat storage capacity in areas with relatively high gas temperatures, the heat storage capacity of the electric heating device can be enhanced, which helps the heat storage module to better exert its buffering effect.

[0015] In an optional embodiment, it further includes an insulating foundation, the number of the insulating foundations corresponds to the heating modules, and the heating modules are arranged on the insulating foundations.

[0016] Beneficial effect: The insulating foundation can ensure the insulation requirements of the heating module to the ground. By equipping each heating module with a separate insulating foundation, the insulation requirements between the heating modules can be guaranteed, thereby improving the safety of the electric heating device.

[0017] In an optional embodiment, an insulating layer is further included, and the insulating layer is arranged on the inner wall of the shell.

[0018] Beneficial effect: By also providing insulation on the inner wall of the shell, the insulation performance of the electric heating device can be enhanced and the safety of the electric heating device can be improved.

[0019] In an optional embodiment, a flow balancing module is further included, and two flow balancing modules are respectively arranged at the air inlet and the air outlet.

[0020] Beneficial effect: The flow balancing module can make the airflow flow to each resistance wire on the heating module more evenly, so that the airflow is fully heated by the resistance wire, thereby improving the heating effect of the electric heating device.

[0021] In a second aspect, the present invention further provides a heating method, which uses the electric heating device provided by the present invention, and the heating method comprises: introducing the air to be heated into the heating chamber; starting the heating module to heat the air; and delivering the heated air to a user.

[0022] Beneficial effects: The heating method uses an electric heating device, so it also has the corresponding beneficial effects brought by the electric heating device, which will not be repeated here.

[0023] In an optional embodiment, it also includes dynamically adjusting the start and stop of each heating module according to the power capacity and the heat load; wherein, when the heat load or the power capacity decreases, the heating modules are sequentially shut down according to the air flow direction until the heating power of the electric heating device matches the current heat load and the power capacity.

[0024] Beneficial effect: By preferentially shutting down the heating modules near the air inlet and keeping the heating modules near the air outlet in working condition, it helps to maintain the temperature of the heat storage module near the air outlet, reduce heat storage loss, and ensure the emergency buffer capacity of the electric heating device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of an electric heating device according to an embodiment of the present invention;

[0027] Figure 2 for Figure 1 Schematic cross-sectional view of the AA section;

[0028] Figure 3 This is a schematic diagram of electrical connections of an electric heating device according to an embodiment of the present invention.

[0029] Description of reference numerals:

[0030] 101. Shell; 102. Heating module; 1021. Support frame; 1022. Support rod; 1023. Resistance wire; 103. Heat storage module; 104. Insulation base; 105. Insulation layer; 1061. Guide plate; 1062. Air distribution plate; 107. Electronic control unit. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0032] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an" and "an" as used herein may also be meant to include the plural forms. The terms "comprise", "include" and "have" are inclusive and therefore specify the presence of stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0033] Although the terms first, second, etc. may be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms may only be used to distinguish one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. In addition, in the description of this application, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0034] For ease of description, spatial relative terms can be used in the text to describe the relationship of an element or feature relative to another element or feature as shown in the figure, and these relative terms are, for example, "end", "length", "inside", "outside", etc. Such spatial relative terms are intended to include different orientations of the mechanism in use or operation except the orientation depicted in the figure. For example, if the mechanism in the figure flips, the element described as "below other elements or features" or "below other elements or features" will be subsequently oriented to "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include the orientation on and below. The mechanism can be oriented in addition (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0035] An electric heating device is a device that converts electrical energy into thermal energy to heat the air. In some areas, a high-power electric heating device is required to meet the heating needs of downstream users. For this reason, some related technologies will connect high voltage electricity (greater than or equal to 1kV) to the electric heating device, but this also puts higher requirements on the reliability of the electric heating device.

[0036] Specifically, in some related technologies, the heating resistor 1023 does not directly contact the outside air, but indirectly heats the air through the sleeve installed outside, which will increase the heat transfer resistance of the resistor 1023. When the outside air flow rate is low, the heat is not dissipated in time, and the large surface heat load can easily cause the resistor 1023 to melt, affecting the use of the equipment. In order to avoid the resistor 1023 from melting, it is necessary to control the heating power of the resistor 1023 in real time according to the working conditions. However, the current power regulation technology under high voltage is not mature and the cost is high, which cannot be applied on a large scale.

[0037] Combine the following Figures 1 to 3, describing an embodiment of the present invention.

[0038] Reference Figure 1 and Figure 2 According to an embodiment of the present invention, on the one hand, an electric heating device is provided, including a shell 101 and a heating module 102, the shell 101 forms a heating chamber with an air inlet and an air outlet, the heating module 102 is arranged in the heating chamber, and a plurality of heating modules 102 are arranged at intervals along the air flow direction; wherein the heating module 102 includes a support frame 1021, a support rod 1022 and a resistance wire 1023, a plurality of support rods 1022 are arranged at intervals on the support frame 1021, the support rod 1022 extends in a direction perpendicular to the air flow direction, the resistance wire 1023 is spirally sleeved on the support rod 1022, and the resistance wire 1023 is used to connect to a high-voltage power supply.

[0039] When in use, the gas flows from the air inlet to the air outlet, thereby forming a directional airflow in the heating chamber. The resistance wire 1023 heats the surrounding gas under high pressure, converting electrical energy into thermal energy. The low-temperature gas entering from the air inlet is converted into high-temperature gas that meets the temperature requirements through step-by-step heating by multiple heating modules 102, and is delivered to downstream users.

[0040] First, the resistance wire 1023 is connected at a high voltage, which can increase the heating power of the electric heating device and is conducive to large-scale promotion; secondly, the resistance wire 1023 directly exchanges heat with the air during the heating process, which can effectively increase the heating rate of the air and also improve the heat exchange efficiency, which helps to reduce the surface temperature of the resistance wire 1023 through the flow of airflow, avoid excessive surface heat load of the resistance wire 1023 under high heating power, and reduce the risk of the resistance wire 1023 melting; finally, the resistance wire 1023 is arranged perpendicular to the airflow direction, so that different positions of the same resistance wire 1023 have similar ambient temperatures, which helps to make the temperature on the surface of the resistance wire 1023 uniform, reduce the risk of damage, and thus increase the service life of the resistance wire 1023.

[0041] In addition, since the electric heating device is provided with a plurality of heating modules 102, the heating power of the electric heating device can be adjusted by selectively shutting down some of the heating modules 102. When the power supply changes (for example, the power capacity of the factory where the electric heating device is located decreases due to production expansion, etc.), the heating power can be adjusted to ensure the normal operation of the electric heating device.

[0042] In the present invention, the support frame 1021 and the support rod 1022 need to be made of insulating materials. For example, the material of the support frame 1021 and the support rod 1022 can be ceramics. Ceramics are commonly used insulating materials in the field of high-voltage power transmission and distribution, and have good high-voltage insulation properties. Specifically, the ceramics can be silicon carbide, silicon nitride, aluminum oxide, etc.

[0043] It is understandable that the high voltage power source is a power grid or other upstream power supply facilities, and the resistor wire 1023 is not suitable for directly connecting to the high voltage power source, so refer to Figure 3 In some embodiments, the electric heating device may further include an electric control unit 107 . High voltage electricity from an upstream power supply facility first enters the electric control unit 107 and is then transmitted to the resistance wire 1023 of the heating module 102 under the control of the electric control unit 107 .

[0044] For example, refer to Figure 3 In some embodiments, the resistance wires 1023 are divided into three groups, and the three groups of resistance wires 1023 are respectively used to access the A phase, the B phase, and the C phase of the high-voltage power supply, and the resistance wires 1023 in the same group are connected in series. The three-phase connection method makes the heating module 102 suitable for accessing the three-wire high-voltage alternating current, meeting the requirements of the electric heating device operating under high voltage. The resistance wires 1023 in the same phase are connected in series, so as to reduce the heating power of a single resistance wire 1023 and reduce the risk of the resistance wire 1023 fusing under high voltage.

[0045] Continue to refer to Figure 3 The resistor wire 1023 can be connected in a star connection, that is, the resistor wire 1023 of each phase is finally connected to the same neutral point.

[0046] In some embodiments, each heating module 102 is equipped with an independent electric control unit 107 to facilitate flexible control of the start and stop of each heating module 102 .

[0047] Optionally, the resistance wire 1023 is made of an electrothermal alloy, and a surface of the resistance wire 1023 is coated with a high-temperature resistant, heat-conductive and anti-corrosion coating to extend the service life of the resistance wire 1023 exposed to the environment.

[0048] In some embodiments, the heating power of the heating module 102 is configured to decrease in sequence along the air flow direction. On the side close to the air inlet, the gas temperature is relatively low, and using a higher heating power helps to convert more electrical energy into thermal energy, helping the gas to increase its temperature. On the side close to the air outlet, the gas temperature approaches or reaches the target temperature, so only a lower heating power is needed to meet the needs of heating or maintaining the temperature. By reasonably allocating the heating power of the electric heating device, the gas can be heated more efficiently at a certain heating power, thereby improving the use effect of the electric heating device.

[0049] In some embodiments, the electric heating device further includes a heat storage module 103 , which is disposed between two adjacent heating modules 102 , and the heat storage module 103 is formed with flow holes that penetrate along the airflow direction.

[0050] The gas heated by the upstream heating module 102 passes through the flow hole and flows to the next heating module 102. First, the heat storage module 103 can absorb part of the heat from the gas and reversely heat the gas when the heating module 102 fluctuates or fails, which plays a buffering role and helps to maintain the stability of the gas temperature at the outlet. Secondly, the heat storage module 103 also has an insulating effect, enhancing the insulation performance between adjacent heating modules 102, which helps to ensure the reliability of the electric heating device under high pressure. Finally, the flow hole also has a diversion effect, making the air flowing to the next heating module 102 more evenly distributed.

[0051] It is understandable that the heat storage module 103 needs to use a material with high thermal conductivity and good insulation. For example, the material of the heat storage module 103 can be ceramic, which is a commonly used insulating material in the field of high-voltage power transmission and distribution and has good high-voltage insulation performance. The ceramic can specifically be silicon carbide, silicon nitride, aluminum oxide, etc.

[0052] Optionally, in some embodiments, the heat storage module 103 and the heating module 102 are spaced apart, and the gas leaving the heating module 102 is first mixed in the heating chamber, and then hits the heat storage module 103 and is guided by the flow hole. Through the mixing process of the gas, the temperature of the gas can be made more uniform, avoiding damage to the downstream resistance wire 1023 due to uneven temperature. In addition, the spacing setting can also utilize the insulating properties of air to ensure the reliability of the electric heating device under high pressure.

[0053] Optionally, in some embodiments, the heat storage capacity of the heat storage module 103 gradually increases along the air flow direction.

[0054] During the heating process, the temperature of the gas gradually increases along the direction of the airflow. By reasonably allocating the heat storage capacity and setting more heat storage capacity in areas with relatively high gas temperature, the heat storage capacity of the electric heating device can be enhanced, which helps the heat storage module 103 to better exert its buffering effect.

[0055] In some embodiments, the electric heating device further includes an insulating foundation 104, the number of the insulating foundations 104 corresponds to the heating modules 102, and the heating modules 102 are arranged on the insulating foundations 104. The insulating foundations 104 can ensure the insulation requirement of the heating modules 102 to the ground. By equipping each heating module 102 with a separate insulating foundation 104, the insulation requirement between the heating modules 102 can be ensured, thereby improving the safety of the electric heating device.

[0056] It is understandable that if Figure 1As shown, the support rod 1022 extends horizontally, and a plurality of support rods 1022 are arranged on the support frame 1021 at intervals along the height direction. The resistance wire 1023 is spirally wound on the support rod 1022 along a horizontal axis.

[0057] For the resistance wire 1023 provided in the form of an electric heating tube in the related art, the placement direction (axis direction) of the electric heating tube does not affect the electric heating performance. However, for the exposed resistance wire 1023 in the present invention, if a vertical placement is adopted, due to the lack of protection of the sleeve and the filling support of the magnesium oxide powder, the spiral resistance wire 1023 will be deformed under the action of gravity, so that the pitch is larger at the top and smaller at the bottom, and the gas is heated unevenly. When a horizontal placement is adopted, the horizontal support rod 1022 supports the resistance wire 1023, and the gravity of the resistance wire 1023 does not generate a component force along the horizontal axis, thereby overcoming this defect and preventing the resistance wire 1023 from changing its pitch under the action of its own weight, which affects the uniformity of heating.

[0058] Optionally, in some embodiments, the electric heating device further comprises an insulating layer 105, and the insulating layer 105 is arranged on the inner wall of the housing 101. By also arranging insulation on the inner wall of the housing 101, the insulation performance of the electric heating device can be enhanced, and the safety of the electric heating device can be improved.

[0059] In some embodiments, the electric heating device further includes a flow balancing module, and two flow balancing modules are respectively arranged at the air inlet and the air outlet. The flow balancing module can make the air flow more evenly flow to each resistance wire 1023 on the heating module 102, so that the air is fully heated by the resistance wire 1023, thereby improving the heating effect of the electric heating device.

[0060] For example, refer to Figure 1 , the flow balancing module is arranged in a trumpet shape at the air inlet and the air outlet. The cross-sectional area of ​​the flow balancing module located at the air inlet gradually increases along the airflow direction. The flow balancing module may include a guide plate 1061 and an air distribution plate 1062, wherein the guide plate 1061 is located upstream of the air distribution plate 1062, and the guide plate 1061 extends obliquely from the air inlet to the downstream. The airflow from the air inlet is dispersed and expanded under the action of the guide plate 1061. The air distribution plate 1062 is provided with an array of holes, and the airflow passing through the air distribution plate 1062 can be uniformed under the action of the air distribution plate 1062. The cross-sectional area of ​​the flow balancing module located at the air outlet gradually decreases along the airflow direction. The flow balancing module may only include the air distribution plate 1062.

[0061] According to an embodiment of the present invention, on the other hand, a heating method is also provided. The heating method uses the electric heating device provided by the present invention, and the heating method includes: introducing air to be heated into a heating chamber; starting the heating module 102 to heat the air; and delivering the heated air to a user.

[0062] On the one hand, the heating method uses an electric heating device, and therefore also has the corresponding beneficial effects brought by the electric heating device. On the other hand, starting the heating module 102 after the air is introduced and the airflow is generated can avoid the resistance wire 1023 from having an excessively large surface heat load under high voltage and low surface air velocity, thereby ensuring the safe and stable operation of the electric heating device.

[0063] In some embodiments, the heating method further comprises dynamically adjusting the start and stop of each heating module 102 according to the power capacity and the heat load.

[0064] That is to say, during normal heating, the low-temperature air to be heated is evenly distributed in the flow balancing module through the guide plate 1061 and the air distribution plate 1062 and enters the heating module 102. Each heating module 102 is in working condition. The electric energy from green electricity or valley electricity is connected to the three-phase resistor 1023 of each heating module 102 through the three-phase lead of the electronic control unit 107. The resistor 1023 converts the electric energy into thermal energy. The air is heated step by step by each heating module 102 along the horizontal process until the air is heated to the target temperature and discharged from the air outlet for user use.

[0065] When the power capacity and the heat load change significantly, only some of the heating modules 102 are turned on to heat the air according to the specific situation, that is, the power of the heating module 102 is dynamically adjusted and matched with the power capacity and the heat load to ensure that the electric heating device is in normal working condition; if a heating module 102 fails, it only needs to be turned off by the electronic control unit 107, and the other heating modules 102 are put into use normally, thereby ensuring continuous and stable heat supply to the outside world.

[0066] Furthermore, in some embodiments, when the heat load or the power capacity decreases, the heating modules 102 are turned off in sequence according to the airflow direction until the heating power of the electric heating device matches the current heat load and the power capacity.

[0067] This specific heating method is for an electric heating device with a heat storage module 103. When a sudden power outage or failure of the high-voltage power causes the heating module 102 to fail to work normally and the gas temperature does not reach the target temperature, the heat previously stored in the heat storage module 103 inside the electric heating device is used to heat the air, ensuring that the user's production process uses continuous and stable heat in an emergency.

[0068] In this case, when the power capacity and heat load change, by preferentially shutting down the heating module 102 near the air inlet and keeping the heating module 102 near the air outlet in working state, it helps to maintain the temperature of the heat storage module 103 near the air outlet, reduce heat storage loss, and ensure the emergency buffer capacity of the electric heating device.

[0069] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An electric heating device, characterized in that: include: A housing (101), wherein the housing (101) forms a heating chamber having an air inlet and an air outlet; A heating module (102), the heating module (102) being arranged in the heating chamber, and a plurality of the heating modules (102) being arranged at intervals along an airflow direction; The heating module (102) comprises a support frame (1021), a support rod (1022) and a resistance wire (1023); a plurality of the support rods (1022) are arranged at intervals on the support frame (1021); the support rods (1022) extend in a direction perpendicular to the airflow direction; the resistance wire (1023) is spirally sleeved on the support rods (1022); and the resistance wire (1023) is used to connect to a high-voltage power supply.

2. The electric heating device according to claim 1, characterized in that: The heating power of the heating module (102) is configured to decrease sequentially along the air flow direction.

3. The electric heating device according to claim 1 or 2, characterized in that: The resistance wires (1023) are divided into three groups. The three groups of resistance wires (1023) are respectively used to connect to the A phase, B phase, and C phase of the high voltage power supply. The resistance wires (1023) in the same group are connected in series.

4. The electric heating device according to claim 1, characterized in that: It also comprises a heat storage module (103), wherein the heat storage module (103) is arranged between two adjacent heating modules (102), and the heat storage module (103) is formed with a flow hole that passes through along the air flow direction.

5. The electric heating device according to claim 4, characterized in that: The heat storage capacity of the heat storage module (103) gradually increases along the air flow direction.

6. The electric heating device according to claim 1, characterized in that: It also includes an insulating foundation (104), the number of the insulating foundations (104) corresponds to the number of the heating modules (102), and the heating modules (102) are arranged on the insulating foundations (104).

7. The electric heating device according to claim 1, characterized in that: It also includes an insulating layer (105), wherein the insulating layer (105) is arranged on the inner wall of the housing (101).

8. The electric heating device according to claim 1, characterized in that: It also includes a flow balancing module, and two flow balancing modules are respectively arranged at the air inlet and the air outlet.

9. A heating method, characterized in that: The heating method uses the electric heating device according to any one of claims 1 to 8, and the heating method comprises: Passing air to be heated into the heating chamber; Starting the heating module (102) to heat the air; The heated air is delivered to the user.

10. The heating method according to claim 9, characterized in that: It also includes dynamically adjusting the start and stop of each heating module (102) according to the power capacity and the heat load; When the heat load or the power capacity decreases, the heating modules (102) are sequentially turned off according to the airflow direction until the heating power of the electric heating device matches the current heat load and the power capacity.

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