An electromagnetic heating coil disc with a shielding structure

Abstract

This utility model relates to the field of electromagnetic induction heating, specifically an electromagnetic heating coil disc with a shielded structure, mainly comprising a support, a coil, and magnets. The coil and magnets are respectively mounted on the support and fixedly connected to it. The magnets are evenly distributed on the plane of the support, with their width gradually increasing away from the center of the support, to make the magnetic field more uniform on the outer and inner sides of the coil per unit length. The support has mounting grooves that mate with the magnets and provide positioning. The support also has a metal shielding ring, which is fixedly connected to the support and positions the coil inside the metal shielding ring. The electromagnetic heating coil disc with a shielded structure of this utility model prevents magnetic leakage, has low noise, and generates little heat.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic induction heating, specifically an electromagnetic heating coil with a shielded structure. Background Technology

[0002] Induction cookers are a very common household cooking appliance, favored by consumers for their high thermal efficiency and reliable safety. The working principle of an induction cooker is to use electricity to energize a heating coil, causing it to generate an alternating magnetic field. This creates eddy currents in the heated object, resulting in electromagnetic heating.

[0003] Chinese patent document CN201898636U discloses an induction cooker coil, which generates an alternating magnetic field when the coil is energized by setting a coil on a support and utilizing the interaction between the coil and radially distributed magnetic strips on the support. However, this coil structure has two technical defects. First, the magnetic strips are arranged radially and uniformly on the support, and are elongated. This structure causes the distance between adjacent magnetic strips to gradually increase as they extend outward from the support, resulting in magnetic leakage as the alternating magnetic field diffuses to the bottom or sides. This phenomenon not only heats non-target areas but also causes significant energy loss in the alternating magnetic field, leading to a substantial decrease in the coil's energy efficiency. Second, the radially distributed magnetic strips cause the inductance per unit length of the coil to change from the outside to the inside, thereby heating the coil and reducing inductance efficiency. In addition, the alternating magnetic field can induce ferromagnetic resonance during operation, causing significant noise from the coil. Utility Model Content

[0004] The purpose of this invention is to overcome the defects of the prior art and provide an electromagnetic heating coil with a shielded structure that can prevent magnetic leakage, has low noise and low heat generation.

[0005] The purpose of this invention is achieved as follows: An electromagnetic heating coil with a shielded structure mainly includes a support, a coil, and magnets. The coil and magnets are respectively mounted on the support and are both fixedly connected to the support. The magnets are evenly distributed on the plane of the support, and their width gradually increases along the direction away from the center of the support, so as to make the magnetic induction per unit length more uniform on the outer and inner sides of the coil. The support has mounting grooves that match the magnets and can position the magnets. The support also has a metal shielding ring, which is fixedly connected to the support and places the coil inside the metal shielding ring.

[0006] This application optimizes the above-mentioned electromagnetic heating coil structure, and the magnet also has an outwardly flared portion. The outwardly flared portion is located at one end of the magnet away from the middle of the support, and extends outward along the width direction of the magnet.

[0007] This application optimizes the structure of the aforementioned electromagnetic heating coil, with each end of the magnet having a fastening part. The fastening part is integrally formed with the magnet, while the support has a fastening groove that mates with the fastening part.

[0008] This application further refines the aforementioned electromagnetic heating coil structure, with a metal shielding ring positioned on the side of the bracket opposite the magnet, and having mounting feet on it. A positioning groove is formed on the bracket, and the positioning groove and positioning feet can be mated and connected.

[0009] This application further refines the aforementioned electromagnetic heating coil disc structure, adding a receiving cavity to the support. The receiving cavity is used to accommodate the coil, and its central portion has a positioning head for fixing the coil.

[0010] Compared with the prior art, the electromagnetic heating coil disc with shielding structure of this utility model has the following advantages:

[0011] 1. In this electromagnetic heating coil, a metal shielding ring and a magnet with gradually increasing width are respectively installed on the support. First, the magnet's width gradually increases away from the center of the support, creating a uniform magnetic environment within the coil's circular surface and reducing the loss of magnetic field lines below the coil. This not only improves the heating uniformity of the coil but also reduces the coil's heat generation. Second, the structure of the metal shielding ring surrounding the coil creates a rotating magnetic field inside the ring due to the eddy current effect. The interaction between the rotating magnetic field and the magnetic field generated by the coil reduces energy loss and improves the heating coil's thermal efficiency. Simultaneously, the interaction between the rotating magnetic field and the magnetic field generated by the coil suppresses resonance caused by the magnetic field, reducing noise during operation.

[0012] 2. In this shielded electromagnetic heating coil, the magnet has an outwardly flared portion extending along its width at the end furthest from the center of the support, and fastening portions at both ends of the magnet. The outwardly flared portion further increases the coverage area of ​​the magnet on the coil plane and creates a closed magnetic flux environment outside the coil, improving the thermal efficiency of the heating coil. The fastening portions create independent magnetic field environments at the lower ends of the magnet, preventing magnetic lines of force from leaking outwards to the outside and bottom of the coil, thus avoiding heating the bottom and interior / exterior of the coil. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is an exploded view of the structure of this utility model;

[0015] Figure 3 This is an exploded view of the installation of the metal shielding ring and bracket of this utility model;

[0016] Figure 4 This is an enlarged view of part A of the present invention;

[0017] Figure 5 This is a schematic diagram of the installation of the bracket and magnet of this utility model;

[0018] Figure 6 This is a schematic diagram of the magnetic field lines of the metal shielding ring and magnet of this utility model.

[0019] The diagram is marked as follows:

[0020] 1. Bracket, 11. Mounting slot, 12. Snap-fit ​​slot, 13. Receiving cavity, 14. Positioning head, 15. Positioning slot, 2. Coil, 21. Pin, 3. Magnet, 31. Outer part, 32. Snap-fit ​​part, 4. Metal shielding ring, 41. Mounting foot. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The applicant hereby emphasizes that the following embodiments are one or more examples of how to achieve the novel technical solution of the present utility model, obtain the corresponding technical effects, and solve the corresponding technical problems. They do not represent that the scope of protection of the technical solution only includes the following embodiments. Any structure that is the same as or equivalent to the electromagnetic heating coil disk with a shielded structure of the present utility model is within the scope of protection of the present utility model.

[0022] according to Figures 1 to 6 As shown, the electromagnetic heating coil with shielding structure of this utility model mainly consists of a support 1, a coil 2, a magnet 3, and a metal shielding ring 4. The coil 2, magnet 3, and metal shielding ring 4 are all mounted on the support 1 and fixed to it. The coil 2 has pins 21, which are electrically connected to the outside environment to enable normal operation. In this utility model, the magnets 3 are evenly distributed on the plane of the support 1, and their width gradually increases away from the center of the support 1. Specifically, the magnets 3 have a trapezoidal width on the mounting plane of the support 1 to improve the uniformity of magnetic induction per unit length on the outer and inner sides of the coil 2. The support 1 also has a mounting groove 11, which can be integrally machined on the support 1 and is connected to the magnets 3 to position the magnets 3 on the support 1.

[0023] In one embodiment of this invention, the magnet 3 further comprises an outwardly extending portion 31. The outwardly extending portion 31 is located at the end of the magnet 3 furthest from the center of the support 1, and is integrally formed with the magnet 3. The outwardly extending portions 31 are respectively disposed on both sides of the end of the magnet 3, extending outwards along the width direction of the magnet 3. After installation on the support 1, the magnets 3 are evenly distributed on the plane of the support 1. At this time, at the end of the magnet 3 furthest from the center of the support 1, the adjacent outwardly extending portions 31 create a closed magnetic flux environment around the coil 2.

[0024] In one embodiment of this utility model, the magnet 3 has a fastening part 32 at each end. The fastening part 32 is located at both ends of the magnet 3 along the radial direction of the bracket 1 and is integrally formed with the magnet 3. The bracket 1 has a fastening groove 12, which is matched and connected with the fastening part 32. The fastening part 32 has two functions: first, the magnet 3 cooperates with the mounting groove 11 on the bracket 1 to form a stable and reliable positioning structure; second, it forms an independent magnetic field environment below the magnet 3 to prevent magnetic lines of force from leaking to the outside and bottom of the coil 2.

[0025] In another embodiment of this utility model, a metal shielding ring 4 is disposed on the side of the bracket 1 opposite to the magnet 3, so as to surround and shield the magnetic lines of force concentrated from that side, thereby improving the thermal efficiency of the coil 2 and reducing the noise of the coil 2 during operation. The metal shielding ring 4 has mounting feet 41, which can be integrally machined with the metal shielding ring 4. A positioning groove 15 is formed on the bracket 1, which is matched and connected with the positioning feet to realize the fixed connection between the metal shielding ring 4 and the bracket 1.

[0026] In another embodiment of this utility model, the bracket 1 has a receiving cavity 13. The receiving cavity 13 is used to accommodate the coil 2 to prevent the coil 2 from shifting during installation. The receiving cavity 13 also has a positioning head 14, which is located in the middle of the receiving cavity 13 and can fix the coil 2.

Claims

1. An electromagnetic heating coil disc with a shielding structure, comprising a coil (2) and a magnet (3) respectively disposed on a support (1), characterized in that: The width of the magnet (3) gradually increases in the direction away from the middle of the bracket (1). The bracket (1) is provided with a mounting groove (11) that matches the magnet (3). The bracket (1) is provided with a metal shielding ring (4).

2. The electromagnetic heating coil with shielding structure according to claim 1, characterized in that: The magnet (3) has an outwardly extended portion (31) extending along the width direction of the magnet (3) at one end away from the middle of the support (1).

3. The electromagnetic heating coil disc with a shielded structure according to claim 1, characterized in that: The magnet (3) has a fastening part (32) at both ends, and the bracket (1) has a fastening groove (12) that matches and connects with the fastening part (32).

4. The electromagnetic heating coil with shielding structure according to any one of claims 1 to 3, characterized in that: The metal shielding ring (4) is located on the side of the bracket (1) opposite to the magnet (3). The metal shielding ring (4) is provided with mounting feet (41), and the bracket (1) is provided with positioning grooves (15) that are matched and connected to the positioning feet.

5. The electromagnetic heating coil with shielding structure according to any one of claims 1 to 3, characterized in that: The bracket (1) is provided with a receiving cavity (13) that can accommodate the coil (2), and a positioning head (14) that can fix the coil (2) is provided in the middle of the receiving cavity (13).

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