A stepped temperature heating device and a coil-coated apparatus with the same

Abstract

The application provides a stepped temperature heating device and a strip-wound iron core coating equipment with the same, and the stepped temperature heating device comprises an end face temperature regulating unit; the end face temperature regulating unit is arranged on the two ends of the strip-wound iron core in the axial direction and is tightly attached to the two end faces of the strip-wound iron core; the end face temperature regulating unit comprises a heat storage module made of a heat absorption material, and the heat absorption capacity of the heat storage module gradually decreases in the radial direction of the strip-wound iron core and from the innermost circle to the outermost circle of the strip-wound iron core, so as to regulate the temperature of the thin strips in the inner and outer circles of the strip-wound iron core when the strip-wound iron core is heated, and finally form a stepped temperature gradually decreasing from the outside to the inside. The radial heating makes the gap between the layers of the thin strips of the strip-wound iron core increase, thereby providing a basic condition for the subsequent overall immersion of the strip-wound iron core in the coating liquid, the coating liquid can quickly infiltrate the surfaces of all the thin strips, the purpose of overall infiltration coating is achieved, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal thin strip wound iron cores, in particular to a step temperature heating device and a strip wound iron core coating device thereof. Background Art

[0002] Currently, cores made of soft magnetic alloy ribbons can be used in transformers, inductors, mutual inductors, and other applications. They are widely used in various fields such as electricity, electronics, vehicles, ships, medical treatment, communications, computers, aerospace, and national defense.

[0003] When winding cores with soft magnetic alloy ribbon, insulating coating is a crucial step. Typically, cores wound with Fe-Si silicon steel ribbon require a silicate insulating coating, while cores wound with Ni-Fe permalloy soft magnetic alloy ribbon require a magnesium oxide insulating coating. This is a relatively mature technology, widely used in production, and its performance indicators meet the needs of most practical projects. Existing coating techniques involve coating and drying the ribbon section by section, which is time-consuming and inefficient. Immersing the entire core wound with uncoated ribbon in the coating liquid would significantly reduce coating time. However, practice has shown that due to the close contact between the layers of the ribbon-wound core, the coating liquid struggles to fully wet the ribbon surface. Even under vacuum, this is difficult to achieve, especially near the center of the ribbon, where it is impossible to wet. This is primarily because the ribbon layers are pressed against each other during the winding process, resulting in close contact between the layers and no gaps for the insulating liquid to enter. Summary of the Invention

[0004] The object of the present invention is to provide a stepped temperature heating device and a tape-wound core coating device thereof to solve at least one of the above-mentioned technical problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention provides a stepped temperature heating device, comprising: two end surface temperature control units;

[0006] The end surface temperature control unit is used to be arranged at both ends of the axial direction of the tape-wound iron core and closely abut the two end surfaces of the tape-wound iron core; the end surface temperature control unit includes a heat storage module made of heat-absorbing material. The heat absorption capacity of the heat storage module gradually decreases in the radial direction of the tape-wound iron core and in the direction from the innermost circle to the outermost circle of the tape-wound iron core. It is used to control the temperature of the thin strips of the inner and outer circles of the iron core when the tape-wound iron core is heated, and finally form a stepped temperature in which the temperature gradually decreases from the outside to the inside.

[0007] This application uses a special annular tooling fixture to make the annular iron core form a gradient temperature distribution state with the temperature decreasing from the outer ring to the inner ring. The temperature, time of the circumferential heating device and the temperature difference ΔT between the outer and inner rings of the iron core are adjusted according to the size and stacking thickness of the iron core.

[0008] Furthermore, it is preferred that a clamping member is further included for fixing the two end surface temperature control units to the iron core. For example, two clamping plates and connecting bolts are used to clamp the end surface temperature control units and the iron core between the two clamping plates from both ends of the iron core in the axial direction, thereby fixing the connection.

[0009] After compaction and clamping, the core and end-face temperature control unit are placed together in a conventional heat treatment furnace. Inside the heat treatment furnace, the outer edge of the annular core is directly heated by radiation and convection, while the inner ring of the core and the heat storage block are shielded by insulating refractory material. As a result, the temperature of the outer edge of the core rises rapidly, quickly approaching the furnace temperature. However, some of the heat transferred from the outer edge to the inner ring is absorbed by the heat storage block, causing the temperature of the inner ring to rise slowly. Furthermore, the metal heat storage block is designed as a cone or pyramidal structure, further ensuring a decreasing temperature gradient from the outer edge to the inner ring of the core.

[0010] Furthermore, on a cross section including the belt around the central axis of the core, the thermal storage module is shaped like an isosceles triangle;

[0011] Alternatively, the heat storage module is in the shape of an isosceles trapezoid; the length of the upper short side of the isosceles trapezoid away from the end face of the iron core is not greater than the diameter of the central hole of the wound iron core.

[0012] Furthermore, the length of the lower long side of the isosceles trapezoid attached to the end face of the iron core is not greater than the outermost circle diameter of the tape-wound iron core (ie, the outer circle diameter of the tape-wound iron core).

[0013] Furthermore, the end surface temperature control unit further includes a heat-insulating sleeve made of a heat-insulating / insulating material, which covers all non-core contact surfaces of the thermal storage module. In other words, all parts of the thermal storage module that do not contact the core end surface are covered with the heat-insulating material.

[0014] Furthermore, it also includes a circumferential heating device, which is sleeved on the outer circle of the tape-wound iron core and is used to heat the outermost thin strip of the tape-wound iron core.

[0015] Furthermore, it also includes a central cooling unit, which is inserted into the central hole of the tape-wound core and is used to cool the innermost thin strip of the tape-wound core.

[0016] Furthermore, the central cooling unit is a heat exchanger.

[0017] Furthermore, the central cooling unit is a cooling pipeline, which is inserted into the central hole of the tape-wound core; the coolant flows through the cooling pipeline, thereby cooling the innermost thin strip of the tape-wound core.

[0018] The cooling pipe is preferably a metal pipe to improve the heat conduction efficiency.

[0019] Furthermore, it also includes a coolant circulation system for circulating coolant to the cooling pipeline.

[0020] Furthermore, the circumferential heating device includes a heating element arranged along the belt-wound core. The heating element is conventional, such as an electric heating plate, electric heating tape, electric heating cable, electric heating disc, electric heating coil, etc. Preferably, it is an electric heating wire spirally wound around the outer circumference of the belt-wound core.

[0021] Furthermore, in the height direction, the effective heating surface of the heating element completely covers the tape-wound core. That is, the height of the effective heating surface of the heating element is greater than or equal to the thickness of the tape-wound core, and the outer circumference of the tape-wound core directly faces the effective heating surface of the heating element.

[0022] Furthermore, the tape-wound core is a silicon steel tape-wound core, a Permalloy tape-wound core, or an amorphous or nanocrystalline soft magnetic alloy tape-wound core.

[0023] The temperature difference ΔT between the outer and inner core rings can be adjusted and controlled within the required range based on the core size and stack thickness. Utilizing the principle that expansion is proportional to temperature, the expansion of each core layer increases from the inner to the outer ring. This creates gaps between the core layers, leaving space for the coating liquid to fill.

[0024] In addition, the present invention also discloses a tape-wound core coating device, which also includes a container filled with coating liquid, for completely immersing the tape-wound core heated by the step temperature heating device in the coating liquid in the container.

[0025] More preferably, it includes an immersion coating studio, in which the container is arranged; and further includes a vacuuming device for vacuuming the immersion coating studio to maintain a negative pressure or vacuum environment in the immersion coating studio.

[0026] The iron core is immersed in the coating liquid under vacuum or negative pressure, forcing the gas molecules between the alloy strips to be discharged, thereby making the coating more thorough and comprehensive, and preventing some alloy strips from being unable to be immersed in the coating liquid.

[0027] Because the core is wound from thin ribbon, radial heat conduction is slowed by the interlamellar interfaces and air gaps. This allows the temperature gradient between the outer and inner rings to be maintained to a certain degree for a period of time. Because the outer layer of each adjacent ribbon is slightly hotter than the inner layer, the thermal expansion of the outer layer is greater than that of the inner layer, ultimately resulting in gaps between the core laminations. Applying an immersion coating to the core in this state ensures that all surfaces of the ribbon are immersed in the coating liquid, resulting in rapid interlaminar insulation coating of the entire core.

[0028] Furthermore, an ultrasonic generator is provided in the container, and the ultrasonic wave emitted by the ultrasonic generator acts on the iron core through the coating liquid, forcing the coating liquid to more actively penetrate into the narrow gaps between the alloy strips, and forcing the gas molecules adsorbed on the surface of the alloy strips to separate and overflow.

[0029] Furthermore, during the coating operation, the air pressure in the infiltration coating working chamber is 5Pa-100Pa.

[0030] Furthermore, the coating liquid is an oxide insulating material solution.

[0031] Furthermore, it also includes a drying device, which includes a drying furnace, a cooling fan, a first air duct and a second air duct;

[0032] The tape-wound iron core soaked in the coating liquid is placed in the drying furnace body and between the first induced air duct and the second induced air duct;

[0033] The drying furnace body is used to heat the iron core;

[0034] The cooling fan, the first air duct, the tape-wound iron core and the second air duct are arranged in sequence on the cooling air path, and are used to cool at least part of the inner ring of the tape-wound iron core with cooling air.

[0035] During cooling, the cooling air passes through the central hole of the iron core, or part of the cooling air passes through the gaps between the thin strips of the iron core, thereby forming a heating environment in which the drying temperature decreases from the outside to the inside.

[0036] Furthermore, the first air duct and the second air duct are frustum-shaped (or trumpet-shaped);

[0037] The tape-wound iron core is clamped between the first air duct and the second air duct, and has a drum shape with a larger middle and smaller ends.

[0038] By controlling the cooling air temperature, the core heats radially inward from the outer edge. The inlet air temperature is lower than the temperature inside the furnace chamber, resulting in a decreasing temperature gradient from the outside to the inside of the annular core. This special air intake and exhaust process also helps the coating liquid solidify layer by layer from the outer ring to the inner ring.

[0039] By adopting the above technical solution, the present invention has the following beneficial effects:

[0040] The present invention provides a radial step temperature heating device, which increases the gap between each layer of thin strips of the wound iron core through radial heating, thereby providing the basic conditions for the subsequent immersion of the entire wound iron core in the coating liquid. The coating liquid can quickly infiltrate the entire surface of the thin strip, achieving the purpose of overall infiltration of the coating, thereby improving production efficiency.

[0041] The tape-wound core coating equipment completes the insulation coating of the core in one go, effectively coating all surfaces of the alloy ribbons that make up the core in a short period of time. This significantly improves coating efficiency while also achieving low permeability. This significantly reduces the manufacturing cost of low-permeability cores for high-voltage pulse and high-voltage power supplies, while ensuring excellent practicality and electromagnetic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 A schematic structural diagram of a stepped temperature heating device provided in Example 1 of the present invention;

[0044] Figure 2 A schematic structural diagram of a stepped temperature heating device provided in Example 2 of the present invention;

[0045] Figure 3 A schematic structural diagram of a tape-wound core coating device provided in Example 3 of the present invention;

[0046] Figure 4 A schematic structural diagram of a drying device provided in Example 4 of the present invention;

[0047] Reference numerals:

[0048] 10-iron core; 20-wetting coating studio; 21-container; 30-vacuum pump; 40-ultrasonic generator; 50-end surface temperature control unit; 51-heat storage module; 52-insulation sleeve; 53-circumferential heating device; 54-central cooling unit; 60-drying furnace body; 61-first air duct; 62-second air duct. DETAILED DESCRIPTION

[0049] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0052] The present invention will be further explained below with reference to specific embodiments.

[0053] Example 1

[0054] like Figure 1 As shown, a step temperature heating device provided in this embodiment includes: two end surface temperature control units 50; the end surface temperature control units 50 are used to be arranged at the two axial ends of the tape-wound core 10 and tightly against the two end surfaces of the tape-wound core 10; the end surface temperature control units 50 include a heat storage module 51 made of heat-absorbing material, and the heat absorption capacity of the heat storage module 51 gradually decreases in the radial direction of the tape-wound core 10 and in the direction from the innermost circle to the outermost circle of the tape-wound core 10, and is used to control the temperature of the thin strips of the inner and outer circles of the tape-wound core 10 when the tape-wound core 10 is heated, and finally form a step temperature in which the temperature gradually decreases from the outside to the inside.

[0055] This application uses a special annular tooling fixture to make the annular core 10 form a gradient temperature distribution state with the temperature decreasing from the outer ring to the inner ring, wherein the temperature, time of the circumferential heating device and the temperature difference ΔT between the outer and inner rings of the core 10 are adjusted according to the size and stacking thickness of the core 10.

[0056] In addition, this embodiment preferably further includes a clamping member (not shown) for securely connecting the two end surface temperature control units 50 to the iron core 10. For example, two clamping plates and connecting bolts are used to clamp the end surface temperature control units 50 and the iron core 10 between the two clamping plates from both axial ends of the iron core 10, thereby securing the connection.

[0057] After compaction and clamping, the iron core 10 and the end surface temperature control unit 50 are placed together in an ordinary heat treatment furnace. In the heat treatment furnace, the outer edge of the annular iron core 10 is directly heated by radiation and heat convection, while the inner ring of the iron core 10 and the heat storage block are shielded by insulating refractory materials. Therefore, the temperature of the outer edge of the iron core 10 rises rapidly and soon approaches the furnace temperature, and part of the heat conducted from the outer edge to the inner ring is absorbed by the heat storage block, and the temperature of the inner ring of the iron core 10 rises slowly. In addition, the metal heat storage block is designed to be a cone or a cone-shaped structure, which further ensures that the temperature distribution of the iron core 10 from the outer edge to the inner ring follows a decreasing gradient law.

[0058] In a cross section including the central axis of the tape-wound core 10, the heat storage module 51 is shaped like an isosceles triangle; alternatively, the heat storage module 51 is shaped like an isosceles trapezoid. The length of the upper short side of the isosceles trapezoid, which faces away from the end face of the core 10, is no longer than the diameter of the central hole of the tape-wound core 10. The length of the lower long side of the isosceles trapezoid, which faces the end face of the core 10, is no longer than the outermost diameter of the tape-wound core 10 (i.e., the outer diameter of the tape-wound core 10).

[0059] The iron core 10 and the end surface temperature control unit 50 are placed together in an ordinary heat treatment furnace. Since heat can only be transferred radially inward through the outer ring of the iron core 10, the heat energy will gradually decrease during the transfer process. At the same time, the heat storage module 51 is used to continuously absorb the transferred heat. As the heat storage module 51 continues to move radially inward, the heat absorption capacity and the amount of heat absorbed by the heat storage module 51 gradually increase, thereby gradually reducing the amount of heat that can be absorbed by the thin strip of the inner ring, so that the temperature field of the iron core 10 is stepped.

[0060] Furthermore, the end surface temperature control unit 50 further includes a heat-insulating sleeve 52 made of a heat-insulating material. The heat-insulating sleeve 52 surrounds all surfaces of the heat storage module 51 that do not contact the core 10. In other words, all portions of the heat storage module 51 that do not contact the end surface of the core 10 are covered with the heat-insulating material.

[0061] The temperature difference ΔT between the outer and inner rings of core 10 can be adjusted and controlled within the desired range based on the size and thickness of core 10. Utilizing the principle that expansion is proportional to temperature, the expansion of each layer of core 10 increases gradually from the inner ring to the outer ring. This creates gaps between the layers of core 10, leaving space for the coating liquid to fill.

[0062] Example 2

[0063] This embodiment is basically the same as embodiment 1, except that:

[0064] like Figure 2As shown, the stepped temperature heating device provided in this embodiment also includes a circumferential heating device 53 and a central cooling unit 54. The circumferential heating device 53 is mounted on the outer circle of the tape-wound core 10 and is used to heat the outermost thin strip of the tape-wound core 10.

[0065] The central cooling unit 54 is inserted into the center hole of the tape-wound core 10 and is used to cool the innermost thin strip of the tape-wound core 10. Furthermore, the central cooling unit 54 is a heat exchanger. For example, the central cooling unit 54 is a cooling pipe inserted into the center hole of the tape-wound core 10. Coolant flows through the cooling pipe, thereby cooling the innermost thin strip of the tape-wound core 10. The cooling pipe is preferably a metal pipe to improve thermal conductivity. A coolant circulation system circulates coolant to the cooling pipe to cool the inner thin strip.

[0066] The circumferential heating device 53 includes a heating element arranged along the tape-wound core 10. The heating element is a conventional heating element, such as an electric heating plate, an electric heating belt, an electric heating cable, an electric heating disk, an electric heating coil, etc. Preferably, it is an electric heating wire spirally wound around the outer circumference of the tape-wound core 10.

[0067] In the height direction, the effective heating surface of the heating element completely covers the tape-wound core 10. That is, the height of the effective heating surface of the heating element is greater than or equal to the thickness of the tape-wound core 10, and the outer circumference of the tape-wound core 10 faces the effective heating surface of the heating element.

[0068] Compared with the common heating furnace method, the arrangement of the circumferential heating device 53 and the central cooling unit 54 is more conducive to the formation and maintenance of the stepped temperature field of the iron core 10 .

[0069] Example 3

[0070] like Figure 3 As shown, this embodiment provides a tape-wound core coating apparatus. The tape-wound core coating apparatus includes the step-temperature heating device of Embodiment 1 or 2, and an immersion coating chamber 20. A container 21 filled with a coating liquid is disposed within the immersion coating chamber 20. After being heated by the step-temperature heating device, the tape-wound core 10 is completely immersed in the coating liquid in the container 21.

[0071] More preferably, a vacuum pump 30 is included for evacuating the coating chamber 20, thereby maintaining a negative pressure or vacuum environment within the coating chamber 20. During the coating operation, the pressure in the coating chamber 20 is between 5 Pa and 100 Pa. The coating liquid is a solution of an oxide insulating material. Immersing the core 10 in the coating liquid under vacuum or negative pressure forces the gas molecules between the alloy strips to be expelled, resulting in a more thorough and comprehensive coating and preventing some areas between the alloy strips from being immersed in the coating liquid.

[0072] Because core 10 is wound from thin ribbon, radial heat conduction is blocked by the interlamellar interfaces and air gaps, resulting in slow radial heat conduction. Therefore, the temperature gradient between the outer and inner rings can be maintained to a certain extent and for a certain period of time. Because the outer layer of each adjacent thin ribbon has a slightly higher temperature than the inner layer, the thermal expansion of the outer layer is greater than that of the inner layer, ultimately resulting in gaps between the core laminations. Applying immersion coating to the entire core 10 in this state ensures that all surfaces of the thin ribbon are immersed in the coating liquid, thereby achieving rapid interlaminar insulation coating of the entire core 10.

[0073] Optionally, an ultrasonic generator 40 may be provided in the container 21. The ultrasonic wave emitted by the ultrasonic generator 40 acts on the iron core 10 through the coating liquid, forcing the coating liquid to more actively penetrate into the narrow gaps between the alloy strips, and forcing the gas molecules adsorbed on the surface of the alloy strips to separate and overflow.

[0074] The present invention increases the gaps between the layers of thin strips of the tape-wound core 10 through radial heating, thereby providing basic conditions for the subsequent immersion of the entire tape-wound core 10 in the coating liquid. The coating liquid can quickly infiltrate the entire surface of the thin strips, achieving the purpose of overall infiltration of the coating and improving production efficiency.

[0075] The coating equipment for the tape-wound core 10 completes the insulation coating of the core 10 in one go, effectively coating all surfaces of the alloy ribbons that make up the core 10 in a short period of time. This significantly improves coating efficiency while also achieving low permeability. This significantly reduces the manufacturing cost of the low-permeability core 10 for high-voltage pulse and high-voltage power supplies, while ensuring excellent practicality and electromagnetic performance.

[0076] Example 4

[0077] This embodiment is basically the same as embodiment 3, except that:

[0078] like Figure 4 As shown, this embodiment provides a tape-wound iron core coating device that also includes a drying device, and the drying device includes a drying furnace body 60, a cooling fan (not shown), a first air duct 61 and a second air duct 62; the tape-wound iron core 10 after being soaked in the coating liquid is placed in the drying furnace body 60, and between the first air duct 61 and the second air duct 62; the drying furnace body 60 is used to heat the iron core 10; the cooling fan, the first air duct 61, the tape-wound iron core 10 and the second air duct 62 are arranged in sequence on the cooling air path, and are used to cool at least part of the inner ring of the tape-wound iron core 10 with cooling air.

[0079] During cooling, the cooling air passes through the central hole of the iron core 10, or part of the cooling air passes through the gaps between the thin strips of the iron core 10, thereby forming a heating environment in which the drying temperature decreases from the outside to the inside.

[0080] The first air duct 61 and the second air duct 62 are preferably cone-shaped (or trumpet-shaped); the wound core 10 is clamped between the first air duct 61 and the second air duct 62, and is in the shape of a drum with a larger middle and smaller ends.

[0081] By controlling the cooling air temperature, the core 10 is heated radially inward from the outer edge. The inlet air temperature is lower than the temperature inside the furnace chamber, resulting in a decreasing temperature gradient from the outside to the inside of the annular core 10. This special air intake and exhaust process also helps the coating liquid solidify layer by layer from the outer ring to the inner ring.

[0082] In order to test the performance of this application, the method of this application and the common coating method were used for comparison test, and the comparison results are as follows:

[0083] 1) A 10 mm wide, 0.05 mm thick cold-rolled 1J85 Permalloy strip was wound into an iron core with an inner diameter of 40 mm, an outer diameter of 50 mm, and a height of 10 mm. Coating tests were conducted using the method described in Example 4 and a conventional coating method. The comparative results are shown in the following table:

[0084]

[0085] It can be seen that the embodiment ensures performance indicators and greatly improves production efficiency.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stepped temperature heating device, characterized in that: include: Two end surface temperature control units (50); The end surface temperature control unit (50) is used to be arranged at both ends of the axial direction of the wound core (10) and closely abut against the two end surfaces of the wound core (10); the end surface temperature control unit (50) includes a heat storage module (51) made of a heat absorbing material, and the heat absorption capacity of the heat storage module (51) gradually decreases in the radial direction of the wound core (10) and in the direction from the innermost circle to the outermost circle of the wound core (10), and is used to control the temperature of the inner and outer thin strips of the core (10) when the wound core (10) is heated, and finally form a stepped temperature in which the temperature gradually decreases from the outside to the inside; The end surface temperature control unit (50) further comprises a heat insulating sleeve (52) made of a heat insulating / insulating material, the heat insulating sleeve (52) wrapping all non-iron core (10) contact surfaces on the heat storage module (51) from the outside.

2. The step temperature heating device according to claim 1, characterized in that: On a cross section including the central axis of the wound iron core (10), the heat storage module (51) is shaped like an isosceles triangle; Alternatively, the heat storage module (51) is shaped like an isosceles trapezoid; the length of the upper short side of the isosceles trapezoid away from the end face of the iron core (10) is not greater than the diameter of the central hole of the wound iron core (10).

3. The step temperature heating device according to claim 2, characterized in that: The length of the lower long side of the isosceles trapezoid attached to the end face of the iron core (10) is not greater than the outermost circle diameter of the wound iron core (10).

4. The step temperature heating device according to claim 1, characterized in that: It also includes a circumferential heating device (53), which is sleeved on the outer circle of the tape-wound iron core (10) and is used to heat the outermost thin strip of the tape-wound iron core (10).

5. The step temperature heating device according to claim 4, characterized in that: It also includes a central cooling unit (54), which is inserted into the central hole of the tape-wound core (10) and is used to cool the innermost thin strip of the tape-wound core (10).

6. The step temperature heating device according to claim 5, characterized in that: The central cooling unit (54) is a cooling pipeline, which is inserted into the central hole of the tape-wound iron core (10); the coolant flows through the cooling pipeline, thereby cooling the innermost thin strip of the tape-wound iron core (10).

7. The step temperature heating device according to claim 4, characterized in that: The circumferential heating device (53) comprises heating elements arranged along the band around the iron core (10).

8. A tape-wound core coating device based on the step temperature heating device according to any one of claims 1 to 7, characterized in that: It also includes a container (21) filled with coating liquid, which is used to completely immerse the wound core (10) heated by the step temperature heating device in the coating liquid in the container (21).

9. The tape-wound core coating equipment according to claim 8, characterized in that: The invention comprises an infiltration coating studio (20), wherein the container (21) is arranged in the infiltration coating studio (20); and further comprises a vacuum pumping device (30) for vacuuming the infiltration coating studio (20) to maintain a negative pressure or vacuum environment in the infiltration coating studio (20).

10. The tape-wound core coating equipment according to claim 8, characterized in that: An ultrasonic generator (40) is provided in the container (21). The ultrasonic generator (40) emits ultrasonic waves that act on the iron core (10) through the coating liquid, thereby forcing the coating liquid to more actively penetrate into the narrow gaps between the alloy strips and forcing the gas molecules adsorbed on the surface of the alloy strips to separate and overflow.

11. The tape-wound core coating equipment according to claim 9, characterized in that: During the coating operation, the air pressure value of the infiltration coating studio (20) is 5Pa-100Pa.

12. The tape-wound core coating equipment according to claim 8, characterized in that: Also included is a drying device, the drying device including a drying furnace body (60), a cooling fan, a first air duct (61) and a second air duct (62); The wound iron core (10) soaked in the coating liquid is placed in the drying furnace body (60) and between the first air duct (61) and the second air duct (62); The drying furnace body (60) is used to heat the iron core (10); The cooling fan, the first air duct (61), the tape-wound iron core (10), and the second air duct (62) are arranged in sequence on the cooling air path and are used to cool at least a portion of the inner ring of the tape-wound iron core (10) with cooling air.

13. The tape-wound core coating equipment according to claim 12, characterized in that: The first air induction pipe (61) and the second air induction pipe (62) are of a frustum type; The wound iron core (10) is clamped between the first air duct (61) and the second air duct (62), and is in the shape of a drum with a larger middle and smaller ends.

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