An electric heating module and a heating device suitable for small length-diameter ratio workpieces

Abstract

The utility model relates to an electric heating equipment, specifically disclose a kind of electric heating module and heating equipment suitable for small long-diameter ratio workpiece.Electric heating module in it includes excitation assembly, the excitation assembly includes first excitation unit and second excitation unit, the first excitation unit and second excitation unit around the same axis annular arrangement;The diameter of first excitation unit is less than the diameter of second excitation unit, and in along the axial direction, first excitation unit and second excitation unit interval arrangement;The electric connection between first excitation unit and second excitation unit, and the first excitation unit and second excitation unit are jointly enclosed into heating interval.Above-mentioned electric heating module can optimize the distribution of inductive magnetic field in radial direction, thereby reducing the difference of heating speed in radial direction due to inductive magnetic field distribution uneven.

Description

Technical Field

[0001] This utility model relates to an electric heating device, specifically to an electric heating module and heating device suitable for workpieces with a small length-to-diameter ratio. Background Technology

[0002] Induction heating is a processing technology that uses the principle of electromagnetic induction to generate an induced current on the surface of a workpiece, thereby rapidly heating the workpiece. It has the advantages of fast heating speed and high energy conversion efficiency. The most common equipment for induction heating is an induction coil. Alternating current flows through the coil, generating an alternating magnetic field that passes through the workpiece. This magnetic field induces eddy currents in the workpiece, thus achieving heating.

[0003] This application addresses a specific type of induction heating for workpieces with small aspect ratios or portions of workpieces with small aspect ratio characteristics, providing an electric heating device, specifically a heating device particularly suitable for induction heating of workpieces with small thickness and large area. Commonly, the magnetic field excited by a ring coil exhibits significant differences in strength in its radial distribution, specifically, the magnetic field near the center is weaker than that near the coil. This leads to differences in the heating rate of the workpiece, especially when the workpiece area is large, the difference in heating rate is more pronounced.

[0004] However, under certain specific working conditions, such as Figure 1 As shown, in the process of separating the brazed layer of a brazed product, precise heating is required to melt the brazed layer 011. However, the two parts being welded should ideally be heated as little as possible to maintain the original material properties. The brazed layer itself has a small aspect ratio. When the area of ​​the brazed layer is large, it often happens that the edge brazed layer has melted while the brazed layer in the central area has not yet reached its melting point. Although the time difference is on the order of seconds, it is enough to cause other materials in the edge area to continue heating to a temperature that affects the material properties. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide an electric heating module and heating equipment suitable for workpieces with small aspect ratio, which can optimize the radial distribution of the induced magnetic field, thereby reducing the difference in radial heating speed caused by uneven distribution of the induced magnetic field.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an electric heating module suitable for workpieces with a small aspect ratio, comprising an excitation assembly, wherein the excitation assembly includes a first excitation unit and a second excitation unit, the first excitation unit and the second excitation unit being arranged in a ring around the same axis; the diameter of the first excitation unit is smaller than the diameter of the second excitation unit, and the first excitation unit and the second excitation unit are spaced apart along the axial direction; the first excitation unit and the second excitation unit are electrically connected, and the first excitation unit and the second excitation unit together form a heating zone.

[0007] Under the excitation of current, both the first excitation unit and the second excitation unit excite magnetic fields. Under the mutual influence of the magnetic fields excited by the first excitation unit and the second excitation unit, the difference in the strength of the magnetic field distribution in the radial direction is reduced, effectively optimizing the radial distribution of the induced magnetic field. This reduces the difference in radial heating speed caused by the uneven distribution of the induced magnetic field, and can well adapt to the induction heating requirements of workpieces with small length-to-diameter ratio.

[0008] Preferably, both the first excitation unit and the second excitation unit are made of square tubes, and each of the first excitation unit and the second excitation unit is provided with a cooling channel, and the cooling channels of the first excitation unit and the second excitation unit are connected.

[0009] Preferably, the diameter of the first excitation unit is denoted as D1, the diameter of the second excitation unit is denoted as D2, and the axial distance between the first excitation unit and the second excitation unit is denoted as L. Then, D1 = (0.5~0.8)D2, L = (0.8~1.2)D1.

[0010] Preferably, the first excitation unit includes several ring-shaped first segments, and the second excitation unit includes several ring-shaped second segments. The first and second segments are alternately distributed in the circumferential direction, and adjacent first and second segments are connected by transition segments.

[0011] The alternating distribution of the first and second segments in the circumferential direction can improve the synchronization of the magnetic fields excited by the first and second excitation units, thereby further improving the heating effect.

[0012] Preferably, the intermediate segment includes an axial portion and a radial portion, wherein the axial portion extends parallel to the axis of the first excitation unit, and the radial portion extends along the radial line of the first excitation unit.

[0013] A heating device for separating embedded brazed layers of workpieces includes a power supply, a connector, and an electric heating module as described above, wherein a second excitation unit is connected to the power supply via the connector. Attached Figure Description

[0014] Figure 1 A partial cross-sectional view of a brazed product;

[0015] Figure 2 This is a schematic diagram of the heating device used for separating the embedded brazed layer of a workpiece in this embodiment;

[0016] Figure 3 This is a schematic diagram of the heating device in the heating state for the workpiece embedded brazing layer separation process in this embodiment;

[0017] Figure 4 This is a schematic diagram of the magnetic field distribution generated by the heating device in the heating state for the separation of the embedded brazed layer of the workpiece in this embodiment;

[0018] Figure 5 This is a top view of the heating module in the heating device used for separating the embedded brazed layer of a workpiece in this embodiment;

[0019] Figure 6 for Figure 5 Sectional view along the AA direction. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Example

[0021] like Figure 2 and Figure 3 As shown, a heating device for separating embedded brazed layers in a workpiece includes a power supply, a connector 4, and an electric heating module. The electric heating module includes an excitation assembly, which comprises a first excitation unit 3 and a second excitation unit 1, wherein the second excitation unit 1 is connected to the power supply via the connector 4.

[0022] like Figures 2-6 As shown, the first excitation unit 3 and the second excitation unit 1 are arranged in a ring around the same axis; the diameter of the first excitation unit 3 is smaller than the diameter of the second excitation unit 1, and the first excitation unit 3 and the second excitation unit 1 are spaced apart along the axial direction. The first excitation unit 3 and the second excitation unit 1 are electrically connected, and the first excitation unit 3 and the second excitation unit 1 together enclose a heating zone.

[0023] like Figure 5 and Figure 6 As shown, specifically, the diameter of the first excitation unit 3 is denoted as D1, the diameter of the second excitation unit 1 is denoted as D2, and the axial distance between the first excitation unit 3 and the second excitation unit 1 is denoted as L. Then, we have: D1 = (0.5~0.8)D2, L = (0.8~1.2)D1.

[0024] like Figure 4As shown, under the excitation of the current, both the first excitation unit 3 and the second excitation unit 1 excite magnetic fields. Under the mutual influence of the magnetic fields excited by the first excitation unit 3 and the second excitation unit 1, the difference in the strength of the magnetic field distribution in the radial direction is reduced, effectively optimizing the distribution of the induced magnetic field in the radial direction, thereby reducing the difference in the radial heating rate caused by the uneven distribution of the induced magnetic field, which can well meet the induction heating requirements of the workpiece 01 with a small length-to-diameter ratio.

[0025] like Figures 2-6 As shown, in one specific implementation, the first excitation unit 3 includes several annularly distributed first segments 31, and the second excitation unit 1 includes several annularly distributed second segments 11. The first segments 31 and second segments 11 are alternately distributed in the circumferential direction, and adjacent first segments 31 and second segments 11 are connected by transition segments. The intermediate segment 2 includes an axial portion and a radial portion. The axial portion extends parallel to the axis of the first excitation unit 3, and the radial portion extends along the radial line of the first excitation unit 3.

[0026] The alternating distribution of the first segment 31 and the second segment 11 in the circumferential direction can improve the synchronization of the magnetic field excited by the first excitation unit 3 and the second excitation unit 1, thereby further improving the heating effect.

[0027] Furthermore, such as Figure 5 and Figure 6 As shown, the first excitation unit 3 and the second excitation unit 1 are both made of square tubes. The first excitation unit 3 and the second excitation unit 1 are respectively provided with cooling channels, and the cooling channels of the first excitation unit 3 and the second excitation unit 1 are connected.

[0028] In summary, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electric heating module suitable for workpieces with a small aspect ratio, characterized in that: The device includes an excitation assembly, which comprises a first excitation unit and a second excitation unit, which are arranged in a ring around the same axis. The diameter of the first excitation unit is smaller than the diameter of the second excitation unit, and the first and second excitation units are spaced apart along the axis. The first and second excitation units are electrically connected, and the first and second excitation units together form a heating zone.

2. The electric heating module according to claim 1, characterized in that: The first excitation unit and the second excitation unit are both made of square tubes. The first excitation unit and the second excitation unit are respectively provided with cooling channels, and the cooling channels of the first excitation unit and the second excitation unit are connected.

3. The electric heating module according to claim 1, characterized in that: Let the diameter of the first excitation unit be denoted as D1, the diameter of the second excitation unit be denoted as D2, and the axial distance between the first excitation unit and the second excitation unit be denoted as L. Then we have: D1 = (0.5~0.8)D2, L = (0.8~1.2)D1.

4. The electric heating module according to any one of claims 1-3, characterized in that: The first excitation unit includes several ring-shaped first segments, and the second excitation unit includes several ring-shaped second segments. The first and second segments are alternately distributed in the circumferential direction, and adjacent first and second segments are connected by transition segments.

5. The electric heating module according to claim 4, characterized in that: The intermediate segment includes an axial portion and a radial portion. The axial portion extends parallel to the axis of the first excitation unit, and the radial portion extends along the radial line of the first excitation unit.

6. A heating device for separating embedded brazed layers in workpieces, characterized in that: It includes a power supply, a connector, and an electric heating module as described in any one of claims 1-5, wherein the second excitation unit is connected to the power supply via the connector.

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