Intermediate frequency induction heater magnetic conductor and intermediate frequency induction heater
By creating a locking slot on the magnetic conductor to lock it to the sensor, the problem of the magnetic conductor easily falling off is solved, extending its service life, reducing maintenance frequency, and improving equipment efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI ZHENHUA PORT MACHINARY HEAVY IND CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-07-03
Smart Images
Figure CN224460045U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medium-frequency induction heating equipment, and more specifically, to a medium-frequency induction heater magnetic conductor and a medium-frequency induction heater. Background Technology
[0002] Medium-frequency induction heaters operate in humid environments with temperatures exceeding 850℃ for extended periods. Their magnetic conductors are made from ordinary silicon steel sheets cut to fit the shape and size of the inductor. They are installed by directly wrapping two thin copper strips around the back of the inductor. With prolonged use, corrosion and expansion occur, causing the copper strips to oxidize and rust, leading to frequent detachment of the magnetic conductors during operation. Furthermore, the frequent replacement of various heating pulley components also damages the magnetic conductors. For these reasons, the magnetic conductors of medium-frequency induction heaters need to be replaced on average every 40 days or after approximately 10 heating cycles. This not only reduces equipment efficiency but also increases maintenance frequency and costs, resulting in a very short lifespan for the magnetic conductors. Utility Model Content
[0003] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.
[0004] The purpose of this utility model includes, for example, providing a magnetic conductor for a medium-frequency induction heater, which can improve the problem that the magnetic conductor on the medium-frequency induction heater is prone to falling off due to oxidation and corrosion of the copper sheet, resulting in a short lifespan and frequent replacement.
[0005] The purpose of this invention also includes providing a medium-frequency induction heater that can improve the problem of copper sheet oxidation and corrosion causing the magnetic conductor to easily fall off, resulting in short lifespan and frequent replacement.
[0006] The embodiments of this utility model can be implemented as follows:
[0007] An embodiment of this utility model provides a magnetic conductor for a medium-frequency induction heater, which is used to assemble with a medium-frequency induction sensor. The magnetic conductor has a snap-fit groove for fitting the magnetic conductor onto the induction sensor to lock the magnetic conductor onto the induction sensor.
[0008] In addition, the medium-frequency induction heater magnetic conductor provided in the embodiments of this utility model may also have the following additional technical features:
[0009] Optionally, the first slot and the second slot are interconnected, and the first slot and the second slot are used for the magnetic conductor to be sleeved on the sensor; the width of the connection between the first slot and the second slot is smaller than the width of the first slot, so as to prevent the magnetic conductor from detaching from the sensor.
[0010] Optionally, the second slot has an opening on the side away from the first slot, the opening being for the sensor to be inserted into the second slot, and the second slot being for at least partially fitting against the outer wall of the sensor.
[0011] Optionally, the card slot further includes a third card slot, wherein the first card slot, the third card slot, and the second card slot are arranged sequentially and connected, the width of the third card slot is smaller than the width of the first card slot, and the width of the third card slot is smaller than the width of the second card slot; the third card slot is used to prevent the magnetic conductor from detaching from the sensor.
[0012] Optionally, the first card slot, the third card slot, and the second card slot together form a slot structure with an "I"-shaped cross-section.
[0013] Optionally, the magnetic conductor has a sheet-like structure, and the snap-fit groove is formed in the middle of the magnetic conductor, wherein the depth direction of the snap-fit groove is along the surface direction of the magnetic conductor, and the snap-fit groove penetrates the thickness direction of the magnetic conductor.
[0014] An embodiment of this utility model also provides a medium-frequency induction heater, which includes a medium-frequency induction sensor, a fixing member, and a medium-frequency induction heater magnetic conductor. The fixing member is fixed on the induction sensor, and the medium-frequency induction heater magnetic conductor is sleeved on the fixing member through the snap-fit groove to lock onto the induction sensor.
[0015] Optionally, the sensor extends along the workpiece to be heated, the fixing member extends along the extension direction of the sensor, and the number of medium-frequency induction heater magnetic conductors is multiple, with the multiple medium-frequency induction heater magnetic conductors being sleeved side by side on the fixing member along the extension direction of the fixing member through the snap-fit groove.
[0016] Optionally, the fastener includes a first block and a second block fixed together, both extending along the extension direction of the sensor. The first block is fixed to the sensor along the extension direction, and the first block and the second block together are used to fit into the snap-fit groove. The cross-sectional width of the first block perpendicular to the extension direction is smaller than the cross-sectional width of the sensor perpendicular to the extension direction, and the cross-sectional width of the second block perpendicular to the extension direction is larger than the cross-sectional width of the first block perpendicular to the extension direction, so as to prevent the magnetic conductor from detaching from the sensor.
[0017] Optionally, the first block and the second block are fixed at the middle to form a structure with a "T" shaped cross-section.
[0018] The beneficial effects of the medium-frequency induction heater magnetic conductor and the medium-frequency induction heater according to the embodiments of this utility model include, for example:
[0019] The magnetic conductor of the medium-frequency induction heater is used for assembly with the medium-frequency induction generator. The magnetic conductor has a snap-fit groove for fitting the magnetic conductor onto the induction generator to lock the magnetic conductor onto the induction generator.
[0020] The installation process of the magnetic conductor with a snap-fit slot is simple and easy to operate. It simply needs to be slipped onto the sensor and will not fall off on its own. This significantly extends the lifespan of the magnetic conductor, greatly prolonging the equipment's maintenance and replacement cycle, thus greatly improving equipment efficiency and reducing the workload of maintenance workers. There are no additional costs incurred, and maintenance and installation can be performed by the operator without the need for specialized maintenance personnel.
[0021] The medium-frequency induction heater, including the aforementioned medium-frequency induction heater magnetic conductor, can improve the problem of copper sheet oxidation and corrosion on the medium-frequency induction heater causing the magnetic conductor to easily fall off, resulting in short lifespan and frequent replacement. Attached Figure Description
[0022] The above-described features and advantages of this invention can be better understood after reading the following detailed description of the embodiments of this disclosure in conjunction with the accompanying drawings. In the drawings, the components are not necessarily drawn to scale, and components having similar related characteristics or features may have the same or similar reference numerals.
[0023] Figure 1 A schematic diagram of the overall structure of the medium-frequency induction heater with a fixing member on the inductor provided in an embodiment of the present utility model;
[0024] Figure 2 A schematic cross-sectional view of the medium-frequency induction heater provided in this embodiment of the utility model, with the fixing member installed on the inductor, perpendicular to the extension direction;
[0025] Figure 3 A side view of the magnetic conductor of the medium-frequency induction heater provided in an embodiment of this utility model;
[0026] Figure 4 A schematic cross-sectional view of the medium-frequency induction heater magnetic conductor and inductor after assembly, provided for an embodiment of this utility model, perpendicular to the extension direction.
[0027] Figure 5 This is a schematic diagram showing multiple medium-frequency induction heater magnetic conductors sequentially mounted on the fixing component of the inductor, as provided in an embodiment of this utility model.
[0028] Icons: Medium frequency induction heater-10; Magnetic conductor-100; Card slot-110; First card slot-111; Third card slot-112; Second card slot-113; Sensor-200; Fixing component-300; First piece-310; Second piece-320. Detailed Implementation
[0029] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention in any way.
[0030] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," "outer," or "vertical" appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, and does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0031] At the same time, it should be noted that the terms "first" and "second" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.
[0032] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified or limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components, etc. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0033] The following is combined Figures 1 to 5 The magnetic conductor 100 of the medium-frequency induction heater 10 provided in this embodiment will be described in detail.
[0034] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 An embodiment of this utility model provides a medium-frequency induction heater 10 with a magnetic conductor 100 for assembly with a medium-frequency induction heater 200. The magnetic conductor 100 has a snap-fit groove 110 for fitting the magnetic conductor 100 onto the induction heater 200 to lock the magnetic conductor 100 onto the induction heater 200.
[0035] The medium-frequency induction heater 10 is a device that uses the principle of electromagnetic induction to convert industrial frequency power into medium-frequency (typically 150Hz to 10kHz) power. It generates an alternating magnetic field through an induction coil (i.e., inductor 200), inducing eddy currents inside a metal workpiece placed in the magnetic field, thereby heating the workpiece. The medium-frequency induction heater 10 has advantages such as fast heating speed, high efficiency, energy saving, and environmental friendliness, and is widely used in metal heat treatment, welding, smelting, and other fields.
[0036] Inductor 200 is a key component in the medium-frequency induction heating system, responsible for generating an alternating magnetic field. Inductor 200 is typically made of wound copper tubing, and its shape and size are designed according to the specific requirements of the workpiece being heated. When a medium-frequency current is passed through inductor 200, an alternating magnetic field is generated. This magnetic field penetrates the workpiece and generates eddy currents within it. These eddy currents generate heat under the resistance of the workpiece, thus achieving heating.
[0037] In induction heating, the magnetic conductor 100 is typically used to concentrate the magnetic field and improve heating efficiency. It is usually made of a high-permeability material, such as silicon steel sheet or ferrite. The magnetic conductor 100 can optimize the distribution of the magnetic field, allowing the magnetic field to act more concentratedly on the part of the workpiece that needs to be heated.
[0038] The magnetic conductor 100 is typically used in conjunction with the inductor 200 to optimize the distribution of the magnetic field. By rationally arranging the magnetic conductor 100, the magnetic field generated by the inductor 200 can be more concentrated on the part of the workpiece that needs to be heated, thereby improving heating efficiency and uniformity. Simultaneously, the magnetic conductor 100 can also reduce magnetic field leakage and minimize its impact on the surrounding environment. In this embodiment, the magnetic conductor 100 is fixed on the side of the inductor 200 furthest from the workpiece.
[0039] Reference Figure 4 In this embodiment, the magnetic conductor 100 is precisely fitted into the sensor 200 through a pre-set snap-fit groove 110. The groove engages with the protrusions or snap-fit structures on the sensor 200, achieving physical locking and preventing displacement. After the magnetic conductor 100 encloses the sensor 200, it forms a closed magnetic circuit, concentrating the alternating magnetic field generated by the sensor 200 and guiding it to the workpiece heating area, reducing magnetic leakage. During operation, the magnetic conductor 100 itself generates heat due to eddy currents, but the high Curie point characteristics of its silicon steel sheet or ferrite material maintain stable magnetic properties and prevent demagnetization.
[0040] The process is simple and easy to operate; the magnetic conductor 100 can simply be inserted directly. This significantly extends the service life of the magnetic conductor 100, greatly prolonging the equipment maintenance and replacement cycle, thus greatly improving equipment efficiency and reducing the workload of maintenance workers. Furthermore, it enhances energy efficiency by confining the magnetic field to the target heating area, significantly increasing magnetic field density and eddy current thermal efficiency, thereby reducing energy consumption.
[0041] Reference Figure 3 and Figure 4 In this embodiment, the first slot 111 and the second slot 113 of the snap-fit slot 110 are interconnected. The first slot 111 and the second slot 113 are used for the magnetic conductor 100 to be sleeved on the sensor 200. The width of the connection between the first slot 111 and the second slot 113 is smaller than the width of the first slot 111 to prevent the magnetic conductor 100 from detaching from the sensor 200.
[0042] The width of the connection between the first slot 111 and the second slot 113 is reduced. The narrow neck structure can form a mechanical lock to prevent the magnetic conductor 100 from falling off the sensor 200. It is very secure, but the installation is very quick. You only need to put the slot 110 of the magnetic conductor 100 onto the sensor 200.
[0043] Reference Figure 3 and Figure 4 In this embodiment, the second slot 113 is provided with a slot on the side away from the first slot 111. The slot is used for the sensor 200 to be inserted into the second slot 113. The second slot 113 is used to at least partially fit against the outer wall of the sensor 200.
[0044] The slot is used to guide the second slot 113 to be engaged on the outer wall of the sensor 200. The inner wall of the second slot 113 is at least partially in contact with the sensor 200, which can make the position of the magnetic conductor 100 relative to the sensor 200 more fixed.
[0045] Reference Figure 3 and Figure 4 In this embodiment, the latching slot 110 further includes a third latching slot 112. The first latching slot 111, the third latching slot 112, and the second latching slot 113 are arranged sequentially and connected. The width of the third latching slot 112 is smaller than the width of the first latching slot 111, and the width of the third latching slot 112 is smaller than the width of the second latching slot 113. The third latching slot 112 is used to prevent the magnetic conductor 100 from detaching from the sensor 200.
[0046] The first slot 111, the third slot 112, and the second slot 113 are together mounted on the sensor 200. The width of the third slot 112 can prevent the first slot 111 from detaching from the sensor 200, thereby preventing the magnetic conductor 100 from exiting the sensor 200 and locking the magnetic conductor 100.
[0047] Reference Figure 3 and Figure 4 In this embodiment, the first slot 111, the third slot 112, and the second slot 113 together form a slot structure with an "I" shaped cross-section.
[0048] by Figure 3The relative positions of the three slots are described below. From top to bottom, they are the second slot 113, the third slot 112, and the first slot 111. The third slot 112 is set vertically, while the second slot 113 and the first slot 111 are set horizontally. The width of the third slot 112 is reduced to prevent the magnetic conductor 100 from exiting the sensor 200.
[0049] In other embodiments, the snap-fit slot 110 can also be semi-circular, as long as the width of the slot is reduced to prevent it from retracting. That is, the snap-fit slot 110 is used for the magnetic conductor 100 to be fitted onto the sensor 200, and the snap-fit slot 110 needs to satisfy the function of not retracting radially from the sensor 200.
[0050] Reference Figure 3 and Figure 4 In this embodiment, the magnetic conductor 100 has a sheet-like structure, and the snap-fit groove 110 is formed in the middle of the magnetic conductor 100. The depth direction of the snap-fit groove 110 is along the surface direction of the magnetic conductor 100, and the snap-fit groove 110 penetrates the thickness direction of the magnetic conductor 100.
[0051] Specifically, the first slot 111, the third slot 112, and the second slot 113 are arranged in a direction parallel to the surface of the magnetic conductor 100, and all three slots extend through the thickness direction of the magnetic conductor 100. After the magnetic conductor 100 is fitted onto the sensor 200, the thickness direction of the magnetic conductor 100 is along the extension direction of the sensor 200. Therefore, multiple magnetic conductors 100 can be sequentially fitted onto the sensor 200, regardless of whether the extension direction of the sensor 200 is straight or curved. Multiple magnetic conductors 100 can be fitted onto the sensor 200 together, which is suitable for sensors 200 of different shapes.
[0052] Reference Figure 1 , Figure 4 and Figure 5 The present invention also provides a medium-frequency induction heater 10, which includes a medium-frequency induction heater 200, a fixing member 300 and a medium-frequency induction heater 10 magnetic conductor 100. The fixing member 300 is fixed on the induction heater 200, and the medium-frequency induction heater 10 magnetic conductor 100 is sleeved on the fixing member 300 through a snap-fit groove 110 to lock it on the induction heater 200.
[0053] The fastener 300 is adapted to the snap-fit groove 110 of the magnetic conductor 100 to fix the magnetic conductor 100 to the sensor 200. The shape of the snap-fit groove 110 is adapted to the shape of the fastener 300. If the fastener 300 cannot be removed from the snap-fit groove 110, the magnetic conductor 100 and the sensor 200 are fixed together.
[0054] Reference Figure 5In this embodiment, the sensor 200 extends along the workpiece to be heated, the fixing member 300 extends along the extension direction of the sensor 200, and the number of medium frequency induction heater 10 magnetic conductors 100 is multiple. The multiple medium frequency induction heater 10 magnetic conductors 100 are arranged side by side on the fixing member 300 through the snap-fit groove 110 along the extension direction of the fixing member 300.
[0055] Reference Figure 1 The inductor 200 extends along the workpiece to be heated in an approximately arc shape, and the fixing member 300 also extends along the extension direction of the inductor 200 and is fixed side by side with the inductor 200. Multiple magnetic conductors 100 are sequentially fitted onto the fixing member 300 from one end. The number of magnetic conductors 100 fitted onto the fixing member 300 is determined as needed, and the multiple magnetic conductors 100 are arranged side by side along the extension direction of the fixing member 300.
[0056] Reference Figure 2 and Figure 4 In this embodiment, the fixing member 300 includes a first block 310 and a second block 320 fixed together. Both the first block 310 and the second block 320 extend along the extension direction of the sensor 200. The first block 310 is fixed to the sensor 200 along the extension direction of the sensor 200. The first block 310 and the second block 320 are used together to fit into the snap-fit groove 110. The cross-sectional width of the first block 310 perpendicular to the extension direction is smaller than the cross-sectional width of the sensor 200 perpendicular to the extension direction. The cross-sectional width of the second block 320 perpendicular to the extension direction is larger than the cross-sectional width of the first block 310 perpendicular to the extension direction, so as to prevent the magnetic conductor 100 from detaching from the sensor 200.
[0057] The extension directions of sensor 200, first block 310, and second block 320 are parallel to each other. "The cross-sectional width of the first block 310 perpendicular to its extension direction" refers to the cross-sectional width of the first block 310 perpendicular to its extension direction. "The cross-sectional width of sensor 200 perpendicular to its extension direction" refers to the cross-sectional width of sensor 200 perpendicular to its extension direction. "The cross-sectional width of the second block 320 perpendicular to its extension direction" refers to the cross-sectional width of the second block 320 perpendicular to its extension direction. From sensor 200 and first block 310 to second block 320, the cross-sectional width decreases and then increases. Both first block 310 and second block 320 mate with the locking groove 110. The locking groove 110 cannot exit from the direction of the second block 320 or from the direction of sensor 200, thus achieving the locking of the magnetic conductor 100 with the sensor 200.
[0058] Reference Figure 2 and Figure 4 In this embodiment, the middle of the first block 310 and the second block 320 are fixed to form a structure with a "T" shaped cross-section.
[0059] Reference Figure 2 The first piece 310 and the second piece 320 have a T-shaped cross section perpendicular to the extension direction, or they can be other shapes, as long as the cross section width of the first piece 310 is smaller than the cross section width of the second piece 320.
[0060] According to the medium-frequency induction heater 10 magnetic conductor 100 provided in this embodiment, the working principle of the medium-frequency induction heater 10 magnetic conductor 100 includes:
[0061] The magnetic conductor 100 and inductor 200 of the medium-frequency induction heater 10 have been improved. The fixing method of the magnetic conductor 100 has been changed from binding to a mechanical locking mechanism where the magnetic conductor 100 is fitted onto the inductor 200 via a snap-fit groove 110. The process is simple and easy to operate; it only requires direct insertion. The service life of the magnetic conductor 100 is greatly extended, the equipment maintenance and replacement cycle is significantly prolonged, the efficiency of equipment use is greatly improved, and the labor intensity of maintenance workers is reduced.
[0062] The inductor 200 of the induction heater is improved by welding a "T"-shaped fixing part 300 onto the inductor 200. Based on the external dimensions of the improved inductor 200, a new "T"-shaped insertable magnetic conductor 100 is designed to fit together with the inductor 200, achieving the effect of self-fixation of the magnetic conductor 100.
[0063] The implementation steps are as follows:
[0064] Step 1, refer to Figure 2 Medium frequency induction heater 10, inductor 200, with "T" shaped fastener 300 welded on.
[0065] Step two: Based on the improved shape of the sensor 200, design and manufacture the insertable magnetic conductor 100 for the new "T"-shaped card slot 110. Note the mating dimensions between the magnetic conductor 100 and the sensor 200, referring to... Figure 4 .
[0066] Step 3: Insert the new "T"-shaped insert-type magnetic conductors 100 one by one into the fixing parts 300 of the improved sensor 200, referring to... Figure 5 .
[0067] Step four: Install the assembled sensor 200 into the medium frequency sensor 200 device, and then the workpiece can be induction heated.
[0068] The medium-frequency induction heater 10 and the magnetic conductor 100 provided in this embodiment have at least the following advantages:
[0069] The magnetic conductor 100 with the card slot 110 is easy to install. It can be directly inserted into the sensor 200 and will not fall off on its own. There is no additional cost. During maintenance and installation, operators can carry out the work without the need for professional maintenance personnel.
[0070] The traditional installation method of the magnetic conductor 100 has been changed from external binding to self-fixation, which will prevent the magnetic conductor 100 from being damaged due to harsh use environment and frequent replacement of workpieces, and will not cause problems such as frequent detachment.
[0071] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.
Claims
1. A magnetic conductor for a medium-frequency induction heater, used for assembly with a medium-frequency induction generator, characterized in that, The magnetic conductor has a locking groove, which is used for the magnetic conductor to be sleeved on the sensor to lock the magnetic conductor on the sensor.
2. The intermediate frequency induction heater flux guide of claim 1, wherein, The first and second slots are interconnected and are used for the magnetic conductor to be fitted onto the sensor. The width of the connection between the first and second slots is smaller than the width of the first slot to prevent the magnetic conductor from detaching from the sensor.
3. The intermediate frequency induction heater flux guide of claim 2, wherein, The second slot has an opening on the side away from the first slot, the opening being used for the sensor to be inserted into the second slot, and the second slot being used to at least partially fit against the outer wall of the sensor.
4. The intermediate frequency induction heater flux guide of claim 3, wherein, The latching slot further includes a third latching slot. The first latching slot, the third latching slot, and the second latching slot are arranged sequentially and connected. The width of the third latching slot is smaller than the width of the first latching slot and the width of the second latching slot is smaller. The third latching slot is used to prevent the magnetic conductor from detaching from the sensor.
5. The intermediate frequency induction heater flux guide of claim 4, wherein, The first card slot, the third card slot, and the second card slot together form a slot structure with an "I" shaped cross-section.
6. The intermediate frequency induction heater flux guide of any one of claims 1-5, wherein, The magnetic conductor has a sheet-like structure, and the snap-fit groove is formed in the middle of the magnetic conductor. The depth direction of the snap-fit groove is along the surface direction of the magnetic conductor, and the snap-fit groove penetrates the thickness direction of the magnetic conductor.
7. An intermediate frequency induction heater characterized by comprising: The medium-frequency induction heater includes a medium-frequency sensor, a fixing member, and a medium-frequency induction heater magnetic conductor as described in any one of claims 1-6. The fixing member is fixed to the sensor, and the medium-frequency induction heater magnetic conductor is sleeved on the fixing member through the snap-fit groove to lock onto the sensor.
8. The intermediate frequency induction heater of claim 7, wherein, The sensor extends along the workpiece to be heated, the fixing member extends along the extension direction of the sensor, and there are multiple medium-frequency induction heater magnetic conductors. The multiple medium-frequency induction heater magnetic conductors are arranged side by side on the fixing member through the snap-fit groove along the extension direction of the fixing member.
9. The intermediate frequency induction heater of claim 8, wherein, The fastener includes a first block and a second block fixed together. Both the first block and the second block extend along the extension direction of the sensor. The first block is fixed to the sensor along the extension direction. The first block and the second block are used together to fit into the snap-fit slot. The cross-sectional width of the first block perpendicular to the extension direction is smaller than the cross-sectional width of the sensor perpendicular to the extension direction. The cross-sectional width of the second block perpendicular to the extension direction is larger than the cross-sectional width of the first block perpendicular to the extension direction, so as to prevent the magnetic conductor from detaching from the sensor.
10. The intermediate frequency induction heater of claim 9, wherein, The first block and the second block are fixed at the middle to form a "T" shaped structure in cross-section.