Coil panel and electromagnetic heating appliance

Abstract

The application discloses a coil disc and an electromagnetic heating appliance. The coil disc comprises a coil support, an upper surface of the coil support being provided with a winding groove spreading from inside to outside, and a lower bottom surface of the coil support being provided with a plurality of magnetic strip mounting grooves isolated from the winding groove; a coil assembly comprising a first coil and a second coil connected in parallel, each layer of winding of the first coil and each layer of winding of the second coil being defined in the winding groove in a plum-bamboo pattern, each coil being connected with a power device in series, and different coils being controlled by the respective power devices to alternately output magnetic lines; and a magnetic strip, each magnetic strip mounting groove being connected with a magnetic strip. Since the first coil and the second coil are connected in parallel, the current can flow to the two coils respectively, the two coils can be staggered in the power-on working time under the fast switching of the respective power devices, the first coil and the second coil can generate high-frequency currents respectively in the staggered time, and thus the coil disc can output continuous magnetic lines outward.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to coils and electromagnetic heating appliances. Background Technology

[0002] The circuit of a common induction cooker on the market first connects to an external 220V AC power supply, which is then converted into a fluctuating DC voltage by an internal rectifier, and finally connected to the coil assembly. After being energized, the coil assembly generates a high-frequency current through the rapid switching of power devices (IGBTs), thereby generating a high-frequency magnetic field.

[0003] In existing technology, the coil, after rectification, becomes a fluctuating unidirectional direct current, which is then converted into a high-frequency magnetic field through the rapid switching of the IGBT. For example... Figure 1 As shown, this is a voltage diagram of an existing coil. As those skilled in the art can see from the diagram, the coil outputs magnetic lines of force in the form of pulses. Therefore, the actual heating time of the existing induction cooker is only half of its working time, and the thermal efficiency needs to be improved. Summary of the Invention

[0004] The present invention aims to provide a coil disk to solve one or more technical problems existing in the prior art, and at least provide a beneficial alternative or inventive condition.

[0005] A coil disk according to a first aspect embodiment of the present invention comprises:

[0006] A wire reel support has a winding groove on its upper surface that spreads outward from the inside, and a plurality of magnetic strip mounting grooves on its lower bottom surface that are isolated from the winding groove.

[0007] A coil assembly includes a first coil and a second coil. The windings of the first coil and the second coil are defined in the winding slots in an alternating manner. All coils are connected in parallel, and each coil is connected in series with a power device. Different coils alternately output magnetic lines of force through the control of their respective power devices.

[0008] There are multiple magnetic strips, and each magnetic strip is connected to a magnetic strip mounting slot.

[0009] The coil disk according to the present invention has at least the following beneficial effects: since the first coil and the second coil are connected in parallel, current can flow to the first coil and the second coil respectively. Under the rapid switching of their respective power devices, the two coils can stagger their energizing time, so that the first coil and the second coil can generate high-frequency current during the staggered time, thereby allowing the coil disk to output continuous magnetic lines of force. Compared with the prior art, the present invention can improve the thermal efficiency per unit time to achieve higher energy efficiency requirements.

[0010] According to some embodiments of the present invention, in order to make the inductance of the first coil close to that of the second coil to reduce the possibility of mutual interference, the number of turns of the first coil is equal to the number of turns of the second coil.

[0011] According to some embodiments of the present invention, the first coil and the second coil are staggered in the horizontal direction to ensure that the heating effect of the first coil and the heating effect of the second coil are consistent.

[0012] According to some embodiments of the present invention, the coil assembly further includes an nth coil, wherein the winding layers of the first coil, the winding layers of the second coil, and the winding layers of the nth coil are defined in the winding slots in an alternating pattern. The present invention does not limit the number of coils; the number can also be three, four, etc.

[0013] According to some embodiments of the present invention, the coil support is a ring structure, and multiple support strips are radially distributed from the center of the inner ring to the surrounding area. Each support strip has multiple winding ribs arranged in a concentric circle or spiral pattern, and all the winding ribs together form the winding groove.

[0014] According to some embodiments of the present invention, in order to facilitate the setting of the magnetic strip mounting slot, each magnetic strip mounting slot is provided on the corresponding bracket strip.

[0015] According to some embodiments of the present invention, the two ends of the magnetic strip mounting groove extend to the inner and outer sides of the winding groove, respectively, so that the magnetic strip mounting groove can better surround the coil assembly.

[0016] According to some embodiments of the invention, the thickness of the support strip is 0.5 mm to 1.5 mm, so that the magnetic strip and the coil assembly can be kept at a suitable distance.

[0017] According to some embodiments of the present invention, the coil support is equipped with a temperature sensing assembly for controlling the circuit switching of the coil assembly to prevent overheating due to malfunction.

[0018] An electromagnetic heating appliance according to a second aspect embodiment of the present invention includes a housing and the aforementioned coil, wherein the outer edge of the coil support is provided with a plurality of mounting ears, and the coil support is mounted inside the housing via the mounting ears.

[0019] The electromagnetic heating appliance according to the present invention has at least the following beneficial effects: by setting the coil, the electromagnetic heating appliance achieves a higher energy efficiency rate compared to the prior art, enabling the electromagnetic heating appliance to heat the heating vessel more efficiently per unit time.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a voltage diagram of a coil disk in existing technology during operation;

[0023] Figure 2 This is a three-dimensional structural schematic diagram of the coil disk according to an embodiment of the present invention;

[0024] Figure 3 This is an exploded perspective view of the coil disk according to an embodiment of the present invention;

[0025] Figure 4 This is a cross-sectional view of the coil disk according to an embodiment of the present invention;

[0026] Figure 5 This is a voltage diagram of the coil disk in operation according to an embodiment of the present invention.

[0027] In the attached diagram: 100-coil spool bracket, 200-coil assembly, 110-inner ring edge, 120-outer ring edge, 130-step hole, 300-bracket strip, 310-winding rib, 320-winding groove, 210-first coil, 220-second coil, 140-magnetic strip mounting groove, 400-long magnetic strip, 150-mounting ear, 151-mounting hole. Detailed Implementation

[0028] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do 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 limiting this invention.

[0030] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In the description of this invention, unless otherwise explicitly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0032] like Figure 2 and Figure 3 As shown, the coil disk according to a first aspect embodiment of the present invention includes a coil support 100, a coil assembly 200, and a plurality of magnetic strips. The coil support 100 serves as the main reference component, and all other components are fixed to the coil support 100 to form a whole. The coil support 100 is made of insulating material, preferably plastic in this embodiment. The coil support 100 has a ring-shaped structure with an inner ring edge 110 and an outer ring edge 120. The inner ring edge 110 is provided with a stepped hole 130 for mounting a temperature probe (not shown in the figures), enabling the coil disk to have a real-time temperature measurement function to prevent overheating due to malfunction. It is understood that those skilled in the art can also select other types of temperature measurement assemblies according to their needs, and are not limited to the above embodiment.

[0033] Specifically, the coil support 100 has multiple support strips 300 radiating outwards from the center of the inner ring. The extension lines of all support strips 300 pass through the center line of the coil support 100. The coil support 100 has a hollow structure between adjacent support strips 300, and the ends of all support strips 300 are connected to the outer ring edge 120 of the coil support 100. Meanwhile, the thickness of each support strip 300 can be selected from 0.5mm to 1.5mm. The upper surface of each support strip 300 has multiple winding ribs 310 arranged in concentric circles or spirals. Adjacent winding ribs 310 are spaced apart and together form a groove, resulting in multiple grooves radiating outwards on a single support strip 300. The grooves of all support strips 300 are arranged one-to-one, thus forming winding grooves 320 radiating outwards on the upper surface of the coil support 100 through the winding ribs 310.

[0034] It is understood that the coil support 100 may also omit the support strip 300 and directly provide the winding rib 310 on the upper surface of the coil support 100. That is, the hollow structure of the coil support 100 can be eliminated. However, in order to reduce costs and improve the heat dissipation coefficient, the hollow structure of the coil support 100 is still retained in this embodiment.

[0035] like Figure 3 and Figure 4 As shown, the winding slot 320 allows the coil assembly 200 to be wound. The coil assembly 200 includes a first coil 210 and a second coil 220. The windings of the first coil 210 and the second coil 220 are arranged in an alternating pattern within the winding slot 320. That is, assuming the winding slot 320 has k slots, the first coil 210 is wound in odd-numbered or even-numbered slots, while the second coil 220 is wound in the remaining slots, thus achieving a positional offset between the first coil 210 and the second coil 220. The first coil 210 and the second coil 220 are electrically connected in parallel, and each coil is connected in series with a power device (not shown in the figure). Different power devices have different switching responses. This invention achieves alternating operation of different coils by controlling different power devices. After the coil assembly 200 is wound around the winding groove 320 according to the design requirements, the coil assembly 200 can be fixed in the winding groove 320 by hot melting process in subsequent production, thereby defining the relative position between the coil assembly 200 and the winding groove 320 and avoiding product defects caused by displacement of the coil assembly 200.

[0036] Furthermore, the top surfaces of all the winding ribs 310 are on the same horizontal plane to facilitate the processing of the winding ribs 310. To ensure that the inductance of the first coil 210 is close to that of the second coil 220, reducing the possibility of mutual interference, the number of turns in the first coil 210 is the same as that in the second coil 220, and their total areas are similar. Moreover, the bottom surface of the first coil 210 is aligned with the bottom surface of the second coil 220, and the top surface of the first coil 210 is aligned with the top surface of the second coil 220. This allows the first coil 210 and the second coil 220 to be horizontally offset, ensuring that the heating effect of the first coil 210 is consistent with that of the second coil 220, preventing deviations in eddy currents, and reducing the thickness of the coil coil to improve heat dissipation.

[0037] Since the magnetic lines of force of the coil assembly 200 can be symmetrically arranged with the coil assembly 200 as the plane of symmetry after being energized, the magnetic lines of force located at the bottom are useless. They not only consume power, but also easily cause damage to other electrical components. Therefore, multiple magnetic strips for shielding the magnetic lines of force need to be provided on the bottom surface of the coil support 100, so that the magnetic lines of force of the coil assembly 200 are concentrated and distributed at the top.

[0038] like Figure 4 As shown, each of the support strips 300 has a magnetic strip mounting groove 140 on its lower surface, and the magnetic strip mounting groove 140 is arranged along the length direction of the support strip 300. A long magnetic strip 400 is fixed to the magnetic strip mounting groove 140 by magnetic flux adhesive. Since the magnetic strip mounting groove 140 is not connected to the winding groove 320, the long magnetic strip 400 does not directly contact the coil assembly 200 to prevent leakage current from the coil assembly 200, which could lead to a short circuit and burnout.

[0039] To allow the magnetic strip to better enclose the coil assembly 200, thereby shielding the magnetic lines of force located below the coil assembly 200 as much as possible and further concentrating the magnetic lines of force located above the coil assembly 200, one end of the magnetic strip mounting groove 140 extends to the inner ring edge 110 of the coil support 100 to form an L-shaped groove (not shown in the figure), and the other end of the magnetic strip mounting groove 140 extends to the outer ring edge 120 of the coil support 100 to form an L-shaped groove. An L-shaped magnetic strip (not shown in the figure) is fixed in at least one of the L-shaped grooves by magnetic flux adhesive. The L-shaped magnetic strip and the long magnetic strip 400 work together to shield the magnetic lines of force located below the coil assembly 200.

[0040] With the above structure, since the first coil 210 and the second coil 220 are connected in parallel, current can flow to the first coil 210 and the second coil 220 respectively. Under the rapid switching of their respective power devices, the two coils can stagger their energizing times, allowing the first coil 210 and the second coil 220 to generate high-frequency currents during the staggered time. At this time, the voltage of the coil disk is as follows: Figure 5 As shown, this allows the coil disk to output continuous magnetic lines of force, effectively improving the thermal efficiency per unit time, so as to achieve higher energy efficiency requirements and ultimately achieve the effect of low power and high efficiency.

[0041] It is understood that the power device is existing technology. In this embodiment, the power device may be an insulated gate bipolar transistor (IGBT). The insulated gate bipolar transistor is a composite fully controllable voltage-driven power semiconductor device composed of a BJT bipolar transistor and a MOS insulated gate field-effect transistor. It has low driving power and low saturation voltage, and is very suitable for use in DC voltage converter systems, such as AC motors, frequency converters, switching power supplies, lighting circuits, traction drives and other fields.

[0042] In other embodiments, the number of coils can be three, four, n, etc., and is not limited to the embodiments described above. Taking three coils as an example, the winding layers of the first coil 210, the second coil 220, and the third coil (not shown in the figure) are defined in the winding slot 320 in an alternating pattern. The three coils are electrically connected in parallel, and each has a power device on its respective circuit. Under the rapid switching of the power device, when the first coil 210 stops working, the second coil 220 and the third coil are energized; when the second coil 220 stops working, the first coil 210 and the third coil are energized; and when the third coil stops working, the first coil 210 and the second coil 220 are energized. These three working states are cyclically repeated, thereby maintaining a continuous output of magnetic lines of force from the coil disk.

[0043] An electromagnetic heating appliance according to a second aspect embodiment of the present invention includes a coil disc according to the first aspect embodiment of the present invention, and a housing (not shown in the drawings), the upper surface of which is a heating surface for supporting a heating dish. To mount the coil disc inside the housing, the outer circumferential edge 120 of the coil support 100 is provided with three mounting ears 150, each mounting ear 150 having a mounting hole 151, allowing the coil support 100 to be mounted inside the housing by screws and the mounting ears 150.

[0044] Since the electromagnetic heating appliance adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0045] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A coil former characterized by, The coil disc support (100) is provided with a plurality of magnetic strip mounting grooves (140) isolated from the winding groove (320) on the lower bottom surface thereof. The coil assembly (200) comprises a first coil (210) and a second coil (220), the number of turns of the first coil (210) is equal to the number of turns of the second coil (220), each layer of winding of the first coil (210) and each layer of winding of the second coil (220) are defined in the winding groove (320) in the manner of plum-blossom among bamboos, all the coils are connected in parallel, each coil is connected in series with a power device, different coils are staggered in the time of power-on work through the control of respective power devices to alternately output magnetic lines, so that the coil disc outputs continuous magnetic lines outward. The number of the magnetic strips is plural, and each magnetic strip mounting groove (140) is connected with the magnetic strip. The first coil (210) and the second coil (220) are staggered in the horizontal direction.

2. The coil former of claim 1, wherein: The coil assembly (200) further comprises an nth coil, each layer of winding of the first coil (210), each layer of winding of the second coil (220) and each layer of winding of the nth coil are defined in the winding groove (320) in the manner of plum-blossom among bamboos.

3. The coil former of claim 1, wherein: The coil disc support (100) is in the annular structure, the coil disc support (100) is radially distributed with a plurality of support strips (300) from the center of the inner ring to the periphery, each support strip (300) is arranged with a plurality of winding ribs (310) in the manner of concentric circles or spiral lines, and all the winding ribs (310) jointly form the winding groove (320).

4. The coil former of claim 1, wherein: Each magnetic strip mounting groove (140) is arranged on the corresponding support strip (300).

5. The coil former of claim 4, wherein: The two ends of the magnetic strip mounting groove (140) respectively extend to the inner side and the outer side of the winding groove (320).

6. The coil former of claim 5, wherein: The thickness of the support strip (300) is 0.5mm to 1.5mm.

7. The coil former of claim 5, wherein: The coil disc support (100) is provided with a temperature measuring assembly.

8. The coil former of claim 1, wherein: The coil disc further comprises a shell, the outer edge of the coil disc support (100) is provided with a plurality of mounting ears (150), and the coil disc support (100) is mounted in the shell through the mounting ears (150).

9. An electromagnetic heating appliance characterised in that, ​

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