Infrared heating disc and electromagnetic oven

Abstract

The utility model discloses an infrared heating disc and electromagnetism stove. The infrared heating disc includes base subassembly and heating wire subassembly, and the base subassembly is equipped with the accommodation groove, and the heating wire subassembly includes at least three heating wires, and at least three heating wires are used to connect to the heating circuit in the parallel way, and the heating wire includes the first part and the second part that are connected with each other, and the first part is located in the accommodation groove, and the second part is arranged through the base subassembly and is used for connecting with the power supply line that realizes at least three heating wires in parallel, and the second part of all heating wires is separated from each other. In the infrared heating disc, the total resistance of the heating wire subassembly can be small, which is beneficial to improve the power of the heating wire subassembly, realizes good heating effect, and can avoid the overheating of the end of the heating wire caused by the proximity effect of high-frequency current, so that the infrared heating disc is better applied to high-frequency application scenarios.

Description

Technical Field

[0001] This utility model relates to the field of household appliances, and in particular to an infrared heating plate and an induction cooker. Background Technology

[0002] In related technologies, when a heating wire is used in an induction cooker, the cooker can generate heat through two heat sources: the heating wire and the electromagnetic coil. Since the electromagnetic coil operates in a high-frequency current environment, the heating wire connected in series with it must also operate in a high-frequency current environment. Because the current flowing through the heating wire is a high-frequency current, the inductive and skin effects of the heating wire are dramatically enhanced. This not only increases the high-frequency impedance, hindering the achievement of good heating results, but also causes problems such as localized overheating, thus limiting the application scenarios for high-frequency heating. Utility Model Content

[0003] This utility model provides an infrared heating plate and an induction cooker to solve at least one of the above-mentioned technical problems.

[0004] This utility model provides an infrared heating plate, the infrared heating plate comprising: A base assembly, wherein the base assembly is provided with a receiving groove; A heating wire assembly comprising at least three heating wires for connecting in parallel to a heating circuit, each heating wire comprising a first portion and a second portion connected to each other, the first portion being located in the receiving groove, the second portion passing through the base assembly and for connecting to a power supply line for realizing the parallel connection of the at least three heating wires, and the second portions of all the heating wires being spaced apart from each other.

[0005] In the aforementioned infrared disk assembly, the heating wire assembly includes at least three heating wires. These three heating wires are connected in parallel to the heating circuit, which reduces the total resistance of the heating wire assembly, improves its power, and achieves a good heating effect. Furthermore, since the second part of the heating wire is separated from each other, the overheating of the end of the heating wire caused by the proximity effect of the high-frequency current can be avoided, making the infrared heating disk better applicable to various application scenarios.

[0006] In some implementations, the total resistance of all heating wires connected in parallel is less than 10 ohms.

[0007] The aforementioned infrared disk assembly can meet the heating requirements.

[0008] In some implementations, all heating wires are of equal length and / or all heating wires have equal resistance.

[0009] The aforementioned infrared disk assembly can achieve a uniform heating effect.

[0010] In some embodiments, the first part includes a main body and a connecting part, the main body being connected to the second part via the connecting part; The receiving groove is divided into multiple annular regions with the center of the receiving groove as the center. The multiple annular regions are sequentially nested along the radial direction of the receiving groove. Each annular region corresponds to a heating wire. The main body of each heating wire is distributed in the corresponding annular region by bending back and forth. Alternatively, the receiving groove is divided into multiple fan-shaped annular regions by its own multiple radii, and each fan-shaped annular region corresponds to a heating wire. The main body of each heating wire is distributed in the corresponding fan-shaped annular region by bending back and forth.

[0011] Different structural designs can be selected for the aforementioned infrared disk components depending on the actual situation.

[0012] In some embodiments, the main body portion distributed in each of the annular regions includes a plurality of arc segments and bends, the ends of the arc segments being connected to another arc segment via the bends, and the plurality of arc segments being spaced apart in a radial direction away from the center of the receiving groove.

[0013] The aforementioned infrared disk assembly helps improve the reliability of the heating wire operation.

[0014] In some embodiments, the main body portion distributed in each of the fan-shaped annular regions includes multiple arc segments and bends. The end of each arc segment is connected to another arc segment through the bend. The multiple arc segments are spaced apart in a radial direction away from the center of the receiving groove, and the central angle corresponding to each arc segment is the same as the central angle of the fan-shaped annular region in which it is located.

[0015] The aforementioned infrared disk assembly helps improve the reliability of the heating wire operation.

[0016] In some embodiments, the distance between two adjacent arcuate segments in the radial direction of the receiving groove is greater than 3 mm.

[0017] The heating reliability of the heating wire is further improved in the aforementioned infrared disk assembly.

[0018] In some embodiments, the resistivity of the second portion is less than that of the first portion, and the thickness of the second portion is greater than that of the first portion.

[0019] The aforementioned infrared disk assembly can prevent terminal heating caused by the proximity effect of high-frequency current.

[0020] In some embodiments, the second part includes two terminals located outside the base assembly, the two terminals being used to connect to the two power supply lines one by one.

[0021] In the aforementioned infrared disk assembly, the contact resistance and terminal heating caused by the proximity effect of high-frequency current are reduced.

[0022] In some embodiments, the infrared heating plate satisfies at least one of the following: The thickness of the first portion of the heating wire is 0.06 mm to 0.3 mm, and the height is 2 mm to 8 mm; The total length of the first part of all heating wires is greater than 2 meters.

[0023] In the aforementioned infrared disk assembly, the power density of the heating wire is kept at a low level.

[0024] In some embodiments, the base assembly includes a support and a heat insulation component, the heat insulation component having the receiving groove, and the heat insulation component being disposed on the support.

[0025] The aforementioned infrared disk assembly provides stable support for the heating wire assembly and prevents the heat generated by the heating wire from affecting the normal operation of other components inside the induction cooker.

[0026] This utility model provides an induction cooker, which includes the infrared heating plate described in any of the above embodiments; The induction cooker includes an electromagnetic coil, a control module, and a heating circuit. The heating wire assembly is connected in series with the electromagnetic coil and then electrically connected to the heating circuit. The control module is electrically connected to the heating circuit and is used to control the conduction and cutoff of the heating circuit.

[0027] The above-mentioned induction cookers can improve the heating performance and electromagnetic compatibility of the induction cookers.

[0028] In some embodiments, the infrared heating plate is located above the electromagnetic coil, which is distributed on the side of the base assembly opposite to the heating wire assembly.

[0029] The above-mentioned induction cookers improve the heating power and heating uniformity to a certain extent.

[0030] Additional aspects and advantages of embodiments of the present 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 present invention. Attached Figure Description

[0031] The above and / or additional aspects and advantages of this invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of the infrared heating plate according to an embodiment of the present invention; Figure 2 This is a top view of the infrared heating plate according to an embodiment of the present invention; Figure 3 yes Figure 2 A schematic diagram of a partial cross-section of the infrared heating element along the MM line; Figure 4 This is an exploded view of the infrared heating plate according to an embodiment of the present invention; Figure 5 This is another structural schematic diagram of the infrared heating plate according to an embodiment of the present invention; Figure 6 This is another top view of the infrared heating plate according to an embodiment of the present invention; Figure 7 yes Figure 6 A schematic diagram of a partial cross-section of the infrared heating plate along line NN; Figure 8 This is another exploded view of the infrared heating plate according to an embodiment of the present invention; Figures 9 to 11 This is a schematic diagram of the heating wire assembly according to an embodiment of the present invention; Figure 12 This is a circuit diagram of an induction cooker according to an embodiment of this utility model.

[0032] Explanation of key component symbols: Infrared heating plate-100, base assembly-10, bracket-12, heat insulation assembly-14, mica sheet-141, heat insulation cotton-143, heat insulation seat-145, receiving groove-16, fan-shaped annular area-161, heating wire assembly-30, heating wire-32, first part-321, main body-3212, arc segment-3212a, bending part-3212b, connecting part-3214, second part-323, wiring terminal-3232; Power supply cable -50, electrical connectors -60; Electromagnetic coil-200, heating circuit-300, control module-400, induction cooker-1000. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments 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 this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral 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, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] This disclosure provides many different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described herein. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0038] Please see Figures 1 to 8This utility model provides an infrared heating plate 100, which includes a base assembly 10 and a heating wire assembly 30. The base assembly 10 is provided with a receiving groove 16. The heating wire assembly 30 includes at least three heating wires 32, which are used to be connected in parallel to a heating circuit 300. Each heating wire 32 includes a first part 321 and a second part 323 that are connected to each other. The first part 321 is located in the receiving groove 16, and the second part 323 passes through the base assembly 10 and is used to connect to a power supply line 50 that enables the at least three heating wires 32 to be connected in parallel. The second parts 323 of all heating wires 32 are spaced apart from each other.

[0039] In other words, the first portions 321 of each heating wire 32 are separated from each other, and the second portions 323 of each heating wire 32 are also separated from each other. The end of each second portion 323 away from the corresponding first portion 321 is connected to the power supply line 50, and the power supply lines 50 are selectively connected to achieve parallel connection of each heating wire 32.

[0040] In the aforementioned infrared heating plate 100, the heating wire assembly 30 includes at least three heating wires 32. The at least three heating wires 32 are connected in parallel to the heating circuit 300, which can reduce the total resistance of the heating wire assembly 30, thereby improving the power of the heating wire assembly 30 and achieving a good heating effect. Furthermore, the second part 323 of all heating wires 32 is separated from each other, which can avoid the overheating of the end of the heating wire 32 caused by the proximity effect of high-frequency current, making the infrared heating plate 100 better applicable to high-frequency application scenarios.

[0041] Specifically, the infrared heating plate 100 is a device that uses infrared radiation for heating. The infrared heating plate 100 contains a heating wire 32, which heats up when energized and transfers the generated heat to the cooking appliance in the form of infrared radiation. Optionally, the infrared heating plate 100 can be used with an induction cooker 1000.

[0042] In related technologies, heating plates typically employ a single heating wire or two heating wires connected in parallel. The resistance of each heating wire is generally greater than 15 ohms. This parameter characteristic makes it difficult to achieve good heating performance in high-frequency applications, thus limiting its application scenarios. In specific high-frequency applications, such as when the high-frequency current flowing through the heating wire exceeds 20 amps and the frequency exceeds 10 kHz, the excessive resistance of the heating wire, if directly connected in parallel at its ends, will cause current to easily concentrate on the surface of the heating wire and lead to mutual interference. This results in a sharp increase in the inductive and skin effects of the heating wire, causing not only an exponential increase in high-frequency impedance but also problems such as localized overheating, increased energy loss, and electromagnetic interference. Ultimately, this leads to uncontrolled heating uniformity and decreased system reliability.

[0043] In this embodiment of the utility model, please refer to Figures 1 to 8 The infrared heating plate 100 includes a base assembly 10 and a heating wire assembly 30. The base assembly 10 has a receiving groove 16 for receiving the heating wire assembly 30. The base assembly 10 provides a platform for mounting and fixing the heating wire assembly 30 and helps to concentrate heat. In some cases, the base assembly 10 also has a heat insulation function to prevent excessive heat from the heating wire assembly 30 from being transferred downwards or outwards, affecting the service life of surrounding components.

[0044] The heating wire assembly 30 includes at least three heating wires 32, which are connected in parallel to the heating circuit 300. Each heating wire 32 has its two ends connected to two common points of the heating circuit 300, allowing each wire to independently draw current from the heating circuit 300 and generate heat based on the thermal effect of the current, which is then transferred to the cooking appliance to be heated in the form of infrared radiation. Each heating wire 32 includes a first part 321 and a second part 323 connected to each other. The first part 321 is located within the receiving groove 16 and is spaced apart from each other. The second part 323 passes through the base assembly 10 and is connected to the power supply line 50. The power supply line 50 is connected in parallel and connected to the heating circuit 300 through an electrical connector 60. Current in the heating circuit 300 can enter the heating wire 32 through the power supply line 50. The number of heating wires 32 can be specifically limited according to actual conditions; this invention does not impose a specific limitation in this regard. In one example, please refer to... Figures 1 to 11 The number of heating wires 32 is three.

[0045] Optionally, the heating wire 32 may include, but is not limited to, nickel-chromium alloy heating wire or iron-chromium-aluminum alloy heating wire.

[0046] In some implementations, when the heating wire assembly 30 is in a high-frequency application scenario, the heating circuit 300 provides a high-frequency current to the heating wire assembly 30. When the high-frequency current passes through a relatively small total resistance, according to the relationship between power, voltage and resistance, the power of the heating wire assembly 30 can be increased to a certain extent, and the resulting impedance is relatively small, which is conducive to the stable transmission of current and the effective output of power, thereby ensuring the stability and efficiency of the heating effect.

[0047] Optionally, the power supply line 50 is composed of multiple strands of conductive wire twisted together. Since the second parts 323 of all heating wires 32 are spaced apart and connected to the power supply line 50 respectively, and the power supply lines 50 are connected in parallel and connected to the heating circuit 300 through the electrical connector 60, when the heating circuit 100 supplies current to the heating wire assembly 30, the current can be distributed among the multiple strands of conductive wire in the power supply line 50, reducing the skin effect caused by current concentration in a single strand. Simultaneously, the currents flowing into the heating wires are isolated from each other and do not interfere with each other, thereby reducing the proximity effect caused by high-frequency current. Furthermore, the heating of the power supply line 50 is negligible and does not affect the performance of the heating wire 32 or the reliability of the heating wire assembly 30. Therefore, the infrared heating plate 100 is better suited for high-frequency applications. Optionally, the power supply line 50 includes Litz wire.

[0048] It is understood that electrical connectors 60 include, but are not limited to, plugs, screw posts, pluggable connectors, spring clips, etc.

[0049] In some implementations, the total resistance of all the heating wires 32 connected in parallel is less than 10 ohms.

[0050] In this way, the heating requirements can be met.

[0051] Specifically, if the total resistance of the heating wire assembly 30 is too high, the heating wire assembly 30 cannot achieve a good heating effect in high-frequency application scenarios. Therefore, at least three heating wires 32 of the heating wire assembly 30 are connected in parallel to the heating circuit 300. Based on the resistance characteristics of the parallel circuit, the total resistance of the heating wire assembly 30 is reduced to increase the heating power, thereby meeting the heating requirements.

[0052] The total resistance formed by all 32 heating wires connected in parallel is R, where R < 10 ohms. In one example, R = 9 ohms, 9.5 ohms, 9 ohms, 8.5 ohms, 8 ohms, 7.5 ohms, 7 ohms, 6.5 ohms, 6 ohms, 5.5 ohms, or other values ​​less than 10 ohms. The lower limit of the total resistance formed by all 32 heating wires connected in parallel can be specifically defined based on the resistance of each heating wire 32, etc., and this utility model does not make a specific limitation in this regard.

[0053] In some implementations, all heating wires 32 are of equal length and / or all heating wires 32 have equal resistance.

[0054] In this way, even heating can be achieved.

[0055] Specifically, since the heating wire 32 is made of a metal conductor, based on the law of resistance, the resistance of a metal conductor is positively correlated with its length. In one embodiment, when all the heating wires 32 are of equal length, according to the law of resistance, the resistance of all the heating wires 32 is also equal (assuming the material and cross-sectional area are the same), and the current through each heating wire 32 is equal. Based on the relationship between power, voltage, and resistance, each heating wire 32 operates with equal power, thereby achieving uniform heating and avoiding localized overheating or insufficient heat.

[0056] In one implementation, uniform heating can be achieved when all heating wires 32 have equal resistance.

[0057] In one embodiment, all heating wires 32 have equal length and equal resistance, which can achieve uniform heating.

[0058] In some embodiments, the first part 321 includes a main body part 3212 and a connecting part 3214, and the main body part 3212 is connected to the second part 323 through the connecting part 3214.

[0059] The receiving groove 16 is divided into multiple annular regions with the center of the receiving groove 16 as the center. The multiple annular regions are arranged in sequence along the radial direction of the receiving groove 16. The annular regions correspond one-to-one with the heating wires 32. The main body 3212 of each heating wire 32 is distributed in the corresponding annular region by bending back and forth. Alternatively, the receiving groove 16 is divided into multiple fan-shaped annular regions 161 by its multiple radii, and each fan-shaped annular region 161 corresponds to a heating wire 32. The main body 3212 of each heating wire is distributed in the corresponding fan-shaped annular region 161 by bending back and forth.

[0060] In this way, different structural designs can be selected according to the actual situation.

[0061] Specifically, in one implementation, please refer to... Figures 1 to 4 Multiple annular regions are arranged concentrically with the accommodating groove 16 along the radial direction of the accommodating groove 16, which can make full use of the space of the accommodating groove 16. The main body 3212 of each heating wire 32 is distributed in the corresponding annular region by bending back and forth, making the structure of the entire heating wire assembly 30 more compact. At the same time, it is beneficial to concentrate the heat generated by the heating wire 32 in the accommodating groove 16 and improve the heating efficiency.

[0062] The number of annular regions can be specifically limited according to actual conditions, and this utility model does not make a specific limitation in this regard. In one example, there are three annular regions, and one heating wire 32 is distributed in each annular region.

[0063] In one implementation, please refer to Figures 5 to 8 Multiple fan-shaped annular regions 161 each occupy a certain angular range in the receiving groove 16, and the main body 3212 of each heating wire is distributed in the corresponding fan-shaped annular region 161 by bending back and forth. Optionally, the multiple fan-shaped annular regions 161 can be arranged to form a large annular region, which is beneficial to concentrate the heat generated by the heating wire 32 in the receiving groove 16 and improve heating efficiency.

[0064] The number of fan-shaped annular regions 161 can be specifically limited according to actual conditions, and this utility model does not make a specific limitation in this regard. In one example, there are three fan-shaped annular regions 161, and one fan-shaped annular region 161 corresponds to one heating wire 32.

[0065] It is understood that the back-and-forth bending refers to the continuous, zigzag-like contour of the main body 3212. That is, at each bend point of the zigzag, the portion of the heating wire 32 after bending can form an angle with the portion before bending. This angle can be acute, right, or obtuse, specifically defined according to the actual length of the main body 3212 and the size of the installation structure; this utility model does not impose a specific limitation in this regard. The zigzag distribution of the main body 3212 can reduce the inductive effect generated by high-frequency current in high-frequency applications, avoiding unstable heating power of the heating wire assembly 30 caused by the inductive effect, and improving the reliability of the heating wire 32 to a certain extent.

[0066] The number of bends in the main body 3212 can be specifically limited according to the length of each heating wire 32, but this utility model does not make a specific limitation in this regard. In one example, please combine 10 and Figure 11 If the heating wire 32 in the middle ring is still too long after three turns, it will be bent in advance to achieve equal length winding.

[0067] In some embodiments, the main body 3212 distributed in each annular region includes a plurality of arc segments 3212a and bends 3212b. The end of the arc segment 3212a is connected to another arc segment 3212a through the bend 3212b. The plurality of arc segments 3212a are spaced apart in a radial direction away from the center of the receiving groove 16.

[0068] This helps improve the operational reliability of the heating wire 32.

[0069] Specifically, please combine Figures 1 to 4Each main body 3212 distributed within each annular region includes multiple arc-shaped segments 3212a and bent portions 3212b. The arc-shaped segments 3212a are heating wire sections with a certain curvature, and their ends are connected to other arc-shaped segments 3212a via bent portions 3212b. The multiple arc-shaped segments 3212a are spaced apart radially away from the center of the receiving groove 16, where the center of the receiving groove 16 is its geometric center, and the radial direction refers to the direction radiating outward from the center of the receiving groove 16. The spaced arrangement of the multiple arc-shaped segments 3212a, due to the identical voltage in each branch of the parallel circuit, allows high-frequency current to flow independently in each heating wire branch. This avoids interference between the arc-shaped segments 3212a, reducing the occurrence of localized overheating due to excessive current density or poor heat dissipation. It effectively disperses current and heat, thereby improving the reliability of the heating wire 32 to a certain extent.

[0070] The number of arc-shaped segments 3212a distributed within each annular region can be specifically limited according to the length of each heating wire 32 and the installation structure; this utility model does not impose a specific limitation in this regard. In one example, please refer to... Figure 9 The number of arc segments 3212a of the heating wire 32 located in the outermost annular region is 2; the number of arc segments 3212a of the heating wire 32 located in the middle annular region is 3; and the number of arc segments 3212a of the heating wire 32 located in the innermost annular region is 5.

[0071] In some embodiments, the main body 3212 distributed in each annular region 161 includes multiple arc segments 3212a and bending portions 3212b. The end of the arc segment 3212a is connected to another arc segment 3212a through the bending portion 3212b. The multiple arc segments 3212a are spaced apart in a radial direction away from the center of the receiving groove, and the central angle corresponding to each arc segment 3212a is consistent with the central angle of the annular region 161 in which it is located.

[0072] This makes the structure of the entire heating wire assembly 30 more compact, and at the same time helps to improve the working reliability of the heating wire 32.

[0073] Specifically, please combine Figures 5 to 8Each main body 3212 distributed within each annular region 161 includes multiple arc-shaped segments 3212a and bent portions 3212b. The arc-shaped segments 3212a are heating wire portions with a certain curvature, and the ends of the arc-shaped segments 3212a are connected to another arc-shaped segment 3212a via the bent portions 3212b. The multiple arc-shaped segments 3212a are spaced apart radially away from the center of the receiving groove 16, and the central angle of each arc-shaped segment 3212a coincides with the central angle of the annular region 161 it is located in. This avoids interference between the arc-shaped segments 3212a, reducing the occurrence of localized overheating due to excessive current density or poor heat dissipation. It effectively disperses current and heat, thereby improving the reliability of the heating wire 32 to a certain extent.

[0074] The number of arc-shaped segments 3212a distributed within each annular region 161 can be specifically limited based on the length of each heating wire 32 and the installation structure; this utility model does not impose a specific limitation in this regard. In one example, please refer to... Figure 6 The number of arc segments 3212a of the heating wire 32 distributed in each fan-shaped annular region is 15.

[0075] In some embodiments, the distance between two adjacent arcuate segments 3212a in the radial direction of the receiving groove 16 is greater than 3 mm.

[0076] This further improves the operational reliability of the heating wire 32.

[0077] Specifically, if the distance between two adjacent arc segments 3212a is too small, the arrangement of the heating wire 32 in the receiving groove 16 provided on the base assembly 10 will be too dense, making it easy for the adjacent arc segments 3212a to interfere, thereby damaging the service life of the heating wire 32 and affecting the reliability of the heating wire 32's operation.

[0078] Please combine Figure 3 The distance between two adjacent arc segments 3212a is D, where D > 3 mm. In one example, D = 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, or other values ​​greater than 3 mm. The upper limit of the distance between two adjacent arc segments 3212a can be specifically limited according to the size of the heating wire 32's installation structure and the precision of the manufacturing process, etc., and this utility model does not make a specific limitation in this regard. Two adjacent arc segments 3212a can be connected by a connecting segment 3214. In some embodiments, the resistivity of the second portion 323 is less than that of the first portion 321, and the thickness of the second portion 323 is greater than that of the first portion 321.

[0079] This prevents the terminals from overheating due to the proximity effect of high-frequency current.

[0080] Specifically, in the heating circuit, high-frequency current flows into the first part 321 through the second part 323. Since the resistivity of the second part 323 is lower than that of the first part 321, according to Joule's law, under the same current, the first part 321, with its higher resistivity, will generate more heat and is more resistant to high temperatures; therefore, the first part is mainly used to generate heating radiation. The second part, with its lower resistivity, can reduce energy loss from the high-frequency current and is mainly used for conduction, allowing heat to concentrate in the first part. Simultaneously, since the thickness of the second part 323 is greater than that of the first part 321, the surface current density can be reduced, resulting in a more uniform current distribution and preventing localized overheating. Therefore, the proximity effect of the high-frequency current can prevent terminal heating, thus improving the reliability of the heating wire assembly 30 to a certain extent.

[0081] Optionally, the material of the first part 321 may be iron-chromium alloy or nickel-chromium alloy, and the material of the second part 323 may be iron.

[0082] In some embodiments, the second part 323 includes two terminals 3232 located outside the base assembly 10, which are respectively used to connect to the two power supply lines 50.

[0083] This reduces contact resistance and terminal heating caused by the proximity effect of high-frequency current.

[0084] Specifically, please combine Figures 9 to 11 Each heating wire 32 has a second portion 323 that passes through the base assembly 10. The second portion 323 includes two terminals 3232 located outside the base assembly 10. The two terminals 3232 are connected to two power supply lines 50 one by one. The power supply lines 50 are connected in parallel and connected to the heating circuit 300 through electrical connectors. The current provided by the heating circuit 300 flows into the heating wire 32 through one of the terminals 3232 of each power supply line 50 and flows out back to the heating circuit 300 from the other terminal 3232. At least three heating wires 32 are arranged in parallel so that each heating wire 32 can independently obtain current from the heating circuit 300 and generate heat based on the thermal effect of the current, which is transferred to the cooking appliance to be heated in the form of infrared radiation.

[0085] Therefore, by using the aforementioned "single-in, single-out" wiring method, where each heating wire 32 is connected to a corresponding power supply line 50 via its respective terminals 3232, independent connections can be achieved through processes including but not limited to welding, crimping, and riveting. This allows for a tighter and more thorough contact between the heating wire 32 and the terminals 3232, enabling current to flow more smoothly from the power supply line 50 into the heating wire 32 and out of the heating wire 32 to the other power supply line 50. This reduces contact resistance caused by contact transmission, thereby reducing energy consumption due to contact resistance and the resulting terminal heating, resulting in greater heating power. Furthermore, in high-frequency applications, this wiring method reduces the proximity effect caused by high-frequency current, further reducing terminal heating and improving the reliability of each heating wire 32.

[0086] exist Figures 9 to 11 In this embodiment, the heating wire assembly 30 includes three heating wires 32. The second part 323 of the heating wire 32 located in the outermost annular region includes end 1 and end 2, with end 1 connected to terminal 1 3232 and end 2 connected to terminal 2 3232. The second part 323 of the heating wire 32 located in the middle annular region includes end 3 and end 6, with end 3 connected to terminal 3 3232 and end 6 connected to terminal 6 3232. The second part 323 of the heating wire 32 located in the innermost annular region includes end 4 and end 5, with end 4 connected to terminal 4 3232 and end 5 connected to terminal 5 3232.

[0087] In some embodiments, the infrared heating plate 100 satisfies at least one of the following: The thickness of the first portion 321 of the heating wire 32 is 0.06 mm to 0.3 mm, and the height is 2 mm to 8 mm; The total length of the first part 321 of all heating wires 32 is greater than 2 meters.

[0088] This keeps the power density of the heating wire 32 at a low level.

[0089] Specifically, please combine Figure 3 The first portion 321 of the heating wire 32 has a rectangular cross-section, and its thickness and height are the width and length of the rectangle, respectively. If the thickness and height of the first portion 321 are too small, the power density will be too low, resulting in insufficient heat generation and failing to meet heating requirements; if the thickness and height of the first portion 321 are too large, the heating wire 32 will occupy too much space. Therefore, the first portion 321 needs to have a suitable thickness and height to keep the power density of the heating wire 32 at a low level, thereby reducing line losses and heat generation and making it suitable for high-frequency applications.

[0090] The thickness of the first part 321 is T, where 0.06 mm ≤ T ≤ 0.3 mm. In one example, T = 0.06 mm, 0.084 mm, 0.108 mm, 0.132 mm, 0.156 mm, 0.18 mm, 0.204 mm, 0.228 mm, 0.252 mm, 0.276 mm, 0.3 mm, or other values ​​greater than or equal to 0.06 mm and less than or equal to 0.3 mm. Optionally, the thickness of the heating wire 32 is the radial dimension of the heating wire 32 along the receiving groove 16.

[0091] The height of part 321 is H, where 2 mm ≤ H ≤ 8 mm. In one example, H = 2 mm, 2.6 mm, 3.2 mm, 3.8 mm, 4.4 mm, 5 mm, 5.6 mm, 6.2 mm, 6.8 mm, 7.2 mm, 8 mm, or other values ​​greater than or equal to 2 mm and less than or equal to 8 mm.

[0092] In one embodiment, it can be deduced from the power density formula that the power density of the heating wire 32 is negatively correlated with the length of the heating wire 32. Therefore, the power density of the heating wire 32 can be reduced by appropriately increasing the length of the first part 321 of all heating wires 32, so as to reduce line loss and heat generation and make it suitable for high-frequency application scenarios.

[0093] The total length of the first portion 321 of all heating wires 32 is L, where L > 2 meters. In one example, L = 2.5 meters, 2 meters, 3 meters, 4 meters, 5 meters, 6 meters, 7 meters, 8 meters, 9 meters, 10 meters, or other values ​​greater than 2 meters. The upper limit of the total length of the first portion 321 of all heating wires 32 can be specifically limited according to the size of the installation structure of the heating wires 32 and the heating power, etc., and this utility model does not make a specific limitation in this regard.

[0094] In some embodiments, the base assembly 10 includes a support 12 and a heat insulation assembly 14, the heat insulation assembly 14 having a receiving groove 16 and being disposed on the support 12.

[0095] In this way, the heating wire assembly 30 is provided with stable support, and the heat generated by the heating wire 32 is prevented from affecting the normal operation of other components in the induction cooker 1000.

[0096] Specifically, please combine Figure 4 and Figure 8The heat insulation component 14 is located above the bracket 12. The heat insulation component 14 and the bracket 12 can be connected by means of, but not limited to, buckles, screws, nesting structures, etc. The receiving groove 16 provided in the heat insulation component 14 is used to receive the heating wire assembly 30, thereby providing stable support for the heating wire assembly 30 and preventing the heat generated by the heating wire 32 from being transferred to other components in the induction cooker 1000 and affecting normal operation. At the same time, it can ensure the thermal stability of the working environment of the heating wire assembly 30.

[0097] Optionally, the thermal insulation component 14 includes at least one of a mica sheet 141, thermal insulation cotton 143, and thermal insulation base 145. Figure 4 and Figure 8 In this embodiment, the heat insulation component 14 includes a mica sheet 141, heat insulation cotton 143, and a heat insulation base 145 stacked sequentially from bottom to top. The mica sheet 141 and heat insulation cotton 143 are located between the support 12 and the heat insulation base 145. The heat insulation base 145 is provided with a receiving groove 16 for accommodating the heating wire assembly 30. Optionally, the heat insulation base 145 is formed by curing silica and is a one-piece molded structure.

[0098] This utility model provides an induction cooker 1000, which includes the infrared heating plate 100 of any of the above embodiments. The induction cooker 1000 also includes an electromagnetic coil 200, a control module 400, and a heating circuit 300. The heating wire assembly 30 is connected in series with the electromagnetic coil 200 and electrically connected to the heating circuit 300. The control module 400 is electrically connected to the heating circuit 300 and is used to control the conduction and cutoff of the heating circuit 300.

[0099] The above-mentioned induction cooker 1000 can improve the heating performance and electromagnetic compatibility of the induction cooker 1000.

[0100] Specifically, the induction cooker 1000 is an electrical appliance that converts electrical energy into heat energy to achieve the purpose of heating. The induction cooker 1000 includes an infrared heating plate 100. When the heating wire 32 in the infrared heating plate 100 is energized, it generates heat based on resistance heating, which is transferred to the cooking appliance being heated in the form of infrared radiation to achieve cooking.

[0101] Optionally, please combine Figure 12 In one embodiment, the heating circuit 300 includes a rectifier bridge (BD1), with its two sides electrically connected to an AC power source (such as mains power) and capacitors C1 and C2, respectively. The rectifier bridge is used to rectify the AC power input from the AC power source into DC power, and to filter the DC power through capacitors C1 and C2 to obtain a relatively stable DC power to power the heating wire assembly 30.

[0102] The heating circuit 300 also includes an IGBT transistor. The control module 400 is electrically connected to the transistor. The control module 400 can output a pulse signal based on the pulse width modulation principle to control the conduction and turn-off of the transistor, thereby controlling the current flow in the heating circuit 300. When the transistor is on, current flows through the heating circuit 300, and direct current passes through the heating wire 32, causing the heating wire 32 to generate heat through resistance. When the transistor is off, the current in the heating circuit 300 is interrupted, and no direct current flows through the heating wire, causing the heating wire to stop working. Optionally, the energizing time of the heating wire assembly 30 within one cycle can be changed by adjusting the duty cycle of the pulse signal, thereby controlling the average power of the heating wire assembly 30 and achieving temperature regulation.

[0103] In high-frequency applications, when the electromagnetic coil 200 has a concave coil structure or a large coil spacing, the inductance of the electromagnetic coil 200 and its coupling characteristics with other components (such as capacitor C2) will change. For example, during the heating process of a ferromagnetic cookware, the resonant resistance coupled from the electromagnetic coil 200 is small, preventing the resonant circuit from operating at its optimal state. This results in decreased reliability of the entire induction cooker 1000 and reduced electromagnetic compatibility (EMC). Therefore, higher-specification power devices and higher costs for EMC improvement are required. The resonant resistance is the equivalent resistance of the electromagnetic coil 200 when energized. It includes DC resistance and high-frequency impedance. The DC resistance remains essentially constant at different frequencies; the deterioration in coupling characteristics is mainly due to the deterioration in high-frequency impedance. Optionally, depending on different resonant capacitor parameters and coil spacing, the inductance of the electromagnetic coil 200 is typically 50-150 microhenries, and the DC resistance is typically 20-500 milliohms.

[0104] Therefore, please combine Figure 12 The heating wire assembly 30 and the electromagnetic coil 200 are connected in series and then connected to the heating circuit 300, forming a resonant circuit together with the capacitor C2. The heating wire assembly 30 can increase the DC resistance, thereby increasing the resonant resistance of the resonant circuit and bringing the resonant circuit into a resonant matching state. This, in turn, increases the heating power to a certain extent, achieving a better heating effect. Resonant matching also reduces reflected waves and stray signals in the circuit, thus improving electromagnetic compatibility and reducing costs by eliminating the need for additional complex filtering or shielding measures for electromagnetic interference.

[0105] While connecting the heating wire assembly 30 in series with the electromagnetic coil 200 to improve heating performance and electromagnetic compatibility, each heating wire 32 in the heating wire assembly 30 will have a high-frequency current passing through it, thereby generating heat. Since the total resistance of the heating wire assembly 30 connected to the circuit in this embodiment of the present invention is relatively small, the impedance generated by the high-frequency current is relatively small, which is conducive to the stable transmission of high-frequency current and the effective output of power, thereby ensuring the stability and efficiency of the heating effect to a certain extent.

[0106] In some embodiments, the infrared heating plate 100 is located above the electromagnetic coil 200, which is distributed on the side of the base assembly 10 away from the heating wire assembly 30.

[0107] This can improve the heating power and heating uniformity of the induction cooker to a certain extent. It also supports heating various types of cookware, regardless of whether the induction cookware has good or poor coupling properties, thus enhancing the user experience.

[0108] Optionally, the induction cooker 1000 also includes a microcrystalline glass panel, with an infrared heating plate 100 located below the microcrystalline glass panel. The upper structure of the microcrystalline glass panel is used to place suitable cooking utensils. When the heating wire assembly 30 is energized, the heat generated by the heating wire 32 is transferred to the heated cooking utensils through the microcrystalline glass panel in the form of infrared radiation.

[0109] An electromagnetic coil 200 is installed below the infrared heating plate 100. When the electromagnetic coil 200 is energized, it couples with the bottom of the cooking appliance placed on the microcrystalline glass panel, thereby generating eddy currents at the bottom of the cooking appliance, which in turn generates heat at the bottom of the cooking appliance to heat it.

[0110] When the induction cooker 1000 is operating, the infrared heating plate 100 and the electromagnetic coil 200 simultaneously heat the cooking utensils placed on the microcrystalline glass panel. The electromagnetic coil 200, due to its rapid heating speed, provides fast and concentrated heating, while the infrared heating plate 100 supplements heating dead zones (such as edge structures) through infrared radiation, thus achieving rapid and uniform heating. Therefore, through the synergistic work of electromagnetic induction and infrared radiation, the heating power of the induction cooker 1000 can be increased and the heating uniformity improved to a certain extent, thereby enhancing the user experience.

[0111] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0112] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An infrared heating plate, characterized in that, include: A base assembly, wherein the base assembly is provided with a receiving groove; A heating wire assembly comprising at least three heating wires for connecting in parallel to a heating circuit, each heating wire comprising a first portion and a second portion connected to each other, the first portion being located in the receiving groove, the second portion passing through the base assembly and for connecting to a power supply line that enables the at least three heating wires to be connected in parallel, and the second portions of all the heating wires being spaced apart from each other.

2. The infrared heating plate according to claim 1, characterized in that, All heating wires are of equal length, and / or all heating wires have equal resistance.

3. The infrared heating plate according to claim 1, characterized in that, The total resistance of all heating wires connected in parallel is less than 10 ohms.

4. The infrared heating plate according to claim 1, characterized in that, The first part includes a main body and a connecting part, wherein the main body is connected to the second part through the connecting part; The receiving groove is divided into multiple annular regions with the center of the receiving groove as the center. The multiple annular regions are sequentially nested along the radial direction of the receiving groove. Each annular region corresponds to a heating wire. The main body of each heating wire is distributed in the corresponding annular region by bending back and forth. Alternatively, the receiving groove is divided into multiple fan-shaped annular regions by its own multiple radii, and each fan-shaped annular region corresponds to a heating wire. The main body of each heating wire is distributed in the corresponding fan-shaped annular region by bending back and forth.

5. The infrared heating plate according to claim 4, characterized in that, Each of the main body portions distributed within each of the annular regions includes multiple arc segments and bends. The ends of the arc segments are connected to another arc segment through the bends. The multiple arc segments are spaced apart in a radial direction away from the center of the receiving groove.

6. The infrared heating plate according to claim 4, characterized in that, Each of the main body portions distributed within each of the aforementioned annular regions includes multiple arc segments and bends. The ends of the arc segments are connected to another arc segment via the bends. The multiple arc segments are spaced apart in a radial direction away from the center of the receiving groove, and the central angle corresponding to each arc segment is consistent with the central angle of the annular region in which it is located.

7. The infrared heating plate according to claim 5 or 6, characterized in that, In the radial direction of the receiving groove, the distance between two adjacent arc segments is greater than 3 mm.

8. The infrared heating plate according to claim 1, characterized in that, The resistivity of the second part is less than that of the first part, and the thickness of the second part is greater than that of the first part.

9. The infrared heating plate according to claim 1, characterized in that, The second part includes two terminals located outside the base assembly, which are used to connect to the two power supply lines one by one.

10. The infrared heating plate according to claim 1, characterized in that, The infrared heating plate satisfies at least one of the following: The thickness of the first portion of the heating wire is 0.06 mm to 0.3 mm, and the height is 2 mm to 8 mm; The total length of the first part of all heating wires is greater than 2 meters.

11. The infrared heating plate according to claim 1, characterized in that, The base assembly includes a bracket and a heat insulation component, the heat insulation component having the receiving groove, and the heat insulation component being disposed on the bracket.

12. An induction cooker, characterized in that, Includes the infrared heating plate according to any one of claims 1-11; The induction cooker also includes an electromagnetic coil, a control module, and a heating circuit. The heating wire assembly is connected in series with the electromagnetic coil and then connected to the heating circuit. The control module is electrically connected to the heating circuit and is used to control the conduction and cutoff of the heating circuit.

13. The induction cooker according to claim 12, characterized in that, The infrared heating plate is located above the electromagnetic coil, which is distributed on the side of the base assembly away from the heating wire assembly.

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