Electromagnetic heating assembly and electromagnetic heating device

Abstract

The embodiment of the utility model provides an electromagnetic heating assembly and an electromagnetic heating device, and the electromagnetic heating assembly comprises a coil which is provided with a first side for arranging a to-be-heated part; the shielding piece covers the first side of the coil, the shielding piece comprises at least two shielding combs, and the at least two shielding combs are uniformly arranged in a circumferential mode. By covering the shielding piece on the coil, at least part of electromagnetic waves can be shielded, so that the influence of electromagnetic interference on other electronic equipment is reduced; moreover, the shielding piece is arranged to be in the shape of the shielding comb, so that the area of the shielding piece can be reduced on the basis of shielding at least part of electromagnetic waves, and the heat productivity of the shielding piece is further reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electromagnetic heating devices, and particularly relates to an electromagnetic heating assembly and an electromagnetic heating device. BACKGROUND

[0002] An electromagnetic heating device such as an induction cooker is a kind of household kitchen appliances. The coil in the electromagnetic heating device is a core component. The coil generates an alternating magnetic field through a control circuit. When the magnetic field passes through a to-be-heated object such as an iron pot, a large number of intensive eddy currents are generated at the bottom of the pot. The Joule heat effect of the eddy currents makes the pot warm, so as to heat food.

[0003] However, the electromagnetic heating device generates electromagnetic interference when working, which affects the normal work of other electronic devices. CONTENT OF THE UTILITY MODEL

[0004] The electromagnetic heating assembly and the electromagnetic heating device provided by the application can reduce the influence of electromagnetic interference on other electronic devices.

[0005] In one aspect, the application provides an electromagnetic heating assembly, comprising:

[0006] a coil having a first side for arranging a to-be-heated object;

[0007] a shielding member covering the first side of the coil, the shielding member comprising at least two shielding combs, the at least two shielding combs being uniformly arranged in a circle.

[0008] Optionally, each of the shielding combs comprises:

[0009] a connecting strip in an arc shape;

[0010] a plurality of first branches being fan-shaped and spaced apart along the connecting strip and connected to the connecting strip respectively;

[0011] a plurality of second branches being fan-shaped and spaced apart along the connecting strip, the plurality of second branches being connected to the connecting strip respectively; and the plurality of second branches are arranged in a staggered manner with the plurality of first branches.

[0012] Optionally, the length of the second branch is greater than the length of the first branch.

[0013] Optionally, the width of the second branch is equal to the width of the first branch.

[0014] Optionally, the distance between adjacent first branches and second branches ranges from 0.5 mm to 4 mm.

[0015] Optionally, all the first branches of the at least two shielding combs are arranged to form a first circular hole, and all the second branches of the at least two shielding combs are arranged to form a second circular hole, and a part of each second branch is located in the first circular hole.

[0016] Optionally, each shielding comb further comprises:

[0017] A grounding support connected with the connecting strip, the grounding support being configured to ground the shielding comb.

[0018] Optionally, the material of the at least two shielding combs is aluminum, copper or steel.

[0019] Optionally, the electromagnetic heating assembly further comprises an insulating member arranged on at least one side of the shielding member.

[0020] In another aspect, the embodiments of the present application further provide an electromagnetic heating device comprising the electromagnetic heating assembly as any one of the above.

[0021] In the electromagnetic heating assembly and the electromagnetic heating device of the embodiments of the present application, the shielding member is arranged on the coil to shield at least part of electromagnetic waves, thereby reducing the influence of electromagnetic interference on other electronic devices. In addition, the shielding member is arranged in the shape of a shielding comb, which can shield at least part of electromagnetic waves and reduce the area of the shielding member, thereby reducing the heat generation of the shielding member. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] In order to more completely understand the present application and its beneficial effects, the following will be described with reference to the drawings. In the following description, the same reference numerals represent the same parts.

[0024] Figure 1 A structural schematic diagram of the electromagnetic heating assembly provided by the embodiments of the present application.

[0025] Figure 2 A structural schematic diagram of the electromagnetic heating assembly provided by the embodiments of the present application. Figure 1 An exploded structural schematic diagram of the middle part of the electromagnetic heating assembly.

[0026] Figure 3 A perspective structural schematic diagram of the shielding member in the electromagnetic heating assembly provided by the embodiments of the present application.

[0027] Figure 4Another perspective view of the shielding of the electromagnetic heating assembly provided by the embodiments of the present application is shown.

[0028] Figure 5 For Figure 1 A cross-sectional view of the electromagnetic heating assembly shown along A-A is shown.

[0029] Figure 6 An exploded view of another structure of the electromagnetic heating assembly provided by the embodiments of the present application is shown.

[0030] Figure 7 An electromagnetic interference test diagram of the coil without shielding provided by the embodiments of the present application is shown.

[0031] Figure 8 An electromagnetic interference test diagram of the electromagnetic heating assembly provided by the embodiments of the present application is shown. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] An electromagnetic heating device such as an induction cooker generates electromagnetic interference when working, which may affect the normal work of other electronic devices. The electromagnetic interference problem mainly manifests in conducted disturbance and space radiation disturbance. If effective optimization measures are not taken in the design, the electromagnetic heating device will not pass the FCC, CCC, CE and other regulatory certifications. The coil is a core component in the electromagnetic heating device. The coil generates a low-frequency (20KHZ to 25KHZ) alternating magnetic field through a control circuit. When the magnetic field passes through a heating object such as an iron pot, a large number of intensive eddy currents are generated at the bottom of the pot. These induced currents are converted into heat to heat food. The low-frequency alternating current generated by the control circuit of the electromagnetic heating device is the source of electromagnetic interference, and the electromagnetic interference is radiated outward through the coil.

[0034] In order to reduce the electromagnetic interference generated by the electromagnetic heating device when working, the embodiments of the present application provide an electromagnetic heating assembly and an electromagnetic heating device, which will be described below with reference to the drawings.

[0035] Please refer to Figure 1 and Figure 2 shown, Figure 1 a structure diagram of the electromagnetic heating assembly provided by the embodiments of the present application is shown, Figure 2 For Figure 1An exploded structural schematic diagram of a middle part of the electromagnetic heating assembly shown. Embodiments of the present application provide an electromagnetic heating assembly 100. The electromagnetic heating assembly 100 comprises a coil 110, a shielding member 120 and a coil disc 130.

[0036] The coil 110 generates an alternating magnetic field through a control circuit or in an energized state. When the magnetic field passes through a heating object such as an iron pot, a large number of intensive eddy currents are generated at the bottom of the pot. The Joule heating effect of the eddy current current causes the pot to heat up, thereby heating the food.

[0037] The coil 110 has a first side X for setting the heating object and a second side Y opposite the first side X. It can be understood that the first side X and the second side are artificially defined for ease of illustration, and should not be understood as a limitation on the coil 110.

[0038] The shielding member 120 covers the first side X of the coil 110, or in other words, the shielding member 120 is attached to the first side X of the coil 110. The shielding member 120 comprises at least two shielding combs 121, which are uniformly arranged in a circle. The distance between the adjacent two shielding combs 121 should not be too large, and the distance that can prevent interference between the adjacent two shielding combs 121 is enough to reduce the risk of poor shielding effect. For example, the distance between the adjacent two shielding combs 121 can be slightly larger than the distance between the teeth of the shielding comb 121.

[0039] For example, when the shielding member 120 comprises two shielding combs 121, the two shielding combs 121 are arranged in a circle with a certain distance, such as can be symmetrically arranged, and can form a regular circle, which can reduce the difficulty of positioning and facilitate assembly on the basis of covering the coil 110; for another example, when the shielding member 120 comprises three shielding combs 121, the three shielding combs 121 are arranged in an array in a circle, which can also form a regular circle; for another example, when the shielding member 120 comprises four shielding combs 121, the four shielding combs 121 are arranged in an array with a certain distance in a circle, which can also form a regular circle.

[0040] The number of shielding combs 121 can be set as needed, such as considering that the thickness of the shielding comb 121 is small, and if the size in the circumferential direction is large, the shielding comb 121 is easy to bend and deform, which affects the shielding effect. In the embodiments of the present application, four shielding combs 121 are taken as an example to illustrate that the four shielding combs 121 can take into account the stability of the structure and the shielding effect.

[0041] The coil disc 130 is used to accommodate and support the coil 110. The coil disc 130 can be adapted to the coil 110 to set a back-shaped groove, which can not only accommodate and support the coil 110, but also isolate the coils 110 of different layers, and can regularize the shape of the magnetic field radiated by the coil 110.

[0042] In the electromagnetic heating assembly 100 provided in this application embodiment, by covering the coil 110 with a shield 120, at least part of the electromagnetic waves can be shielded, thereby reducing the impact of electromagnetic interference on other electronic devices; and by setting the shield 120 in the shape of a shielding comb 121, the area of ​​the shield 120 can be reduced while achieving the shielding of at least part of the electromagnetic waves, thereby reducing the heat generation of the shield 120.

[0043] It should be noted that the shielding comb 121 is a shielding structure similar to a comb. The shielding component 120 is set into a shape composed of at least two shielding combs 121. On the one hand, it can ensure the penetration of low-frequency magnetic fields and block high-frequency radiation signals, because the higher the frequency of electromagnetic waves, the weaker the penetration ability. On the other hand, it can also reduce the area of ​​the shielding component 120, thereby reducing the heat generation of the shielding component 120. Since shielding components with high magnetic permeability, such as metal materials, will be heated by alternating magnetic fields, using low magnetic permeability metals such as aluminum, combined with a sawtooth-shaped structure, can reduce the eddy current heating generated by the magnetic field.

[0044] For example, at least two of the shielding combs 121 are made of metals with low magnetic permeability, such as aluminum, copper, or steel, to prevent or reduce the risk of the shielding component 120 being heated by the alternating magnetic field.

[0045] For example, please refer to Figure 3 As shown, Figure 3 This is a schematic diagram of the shielding component in the electromagnetic heating assembly provided in this application embodiment. Each shielding comb 121 includes a connecting strip 1210, a plurality of first branches 1212, and a plurality of second branches 1214.

[0046] The connecting strip 1210 is arc-shaped. All the connecting strips 1210 in at least two shielding combs 121 are arranged to form a discontinuous circular strip structure to accommodate the coil 110.

[0047] Multiple first branches 1212 are arranged in a fan-shaped interval along the connecting strip 1210, such as being arranged at equal intervals, to facilitate positioning and manufacturing; the multiple first branches 1212 are respectively connected to the connecting strip 1210, and can be integrally formed during manufacturing.

[0048] Multiple second branches 1214 are arranged in a fan-shaped interval along the connecting strip 1210, such as being arranged at equal intervals, to facilitate positioning and manufacturing; the multiple second branches 1214 are respectively connected to the connecting strip 1210, and can be integrally formed during manufacturing; furthermore, the multiple second branches 1214 are staggered from the multiple first branches 1212, in other words, each second branch 1214 is located between two first branches 1212.

[0049] In the manufacturing process, the connecting strip 1210, the plurality of first branches 1212 and the plurality of second branches 1214 can be integrally formed to accelerate the manufacturing speed.

[0050] The length of the second branches 1214 is greater than the length of the first branches 1212, which can increase the extension range of the shielding comb 121 and improve the shielding effect, and can also reduce the area of the shielding comb 121 to reduce the heat generated by the magnetic field.

[0051] For example, the width of the second branches 1214 is equal to the width of the first branches 1212, which can facilitate the manufacturing of the shielding comb 121 and balance the stress of the first branches 1212 and the second branches 1214.

[0052] For example, the distance between adjacent first branches 1212 and second branches 1214 ranges from 0.5 mm to 4 mm, such as 1 mm to 3 mm. When the distance between adjacent first branches 1212 and second branches 1214 is 1 mm, the shielding comb 121 has dense sawteeth, which can increase the blocking effect of high-frequency electromagnetic waves. When the distance between adjacent first branches 1212 and second branches 1214 is 3 mm, the shielding comb 121 has sparse sawteeth, which can reduce the area of the shielding comb 121 and thus reduce the heat generated by the eddy current. When the distance between adjacent first branches 1212 and second branches 1214 is 2 mm, the shielding effect and the heat generated by the eddy current can be balanced.

[0053] For example, the structure formed by at least two shielding combs 121 is that all the first branches 1212 of the at least two shielding combs 121 surround to form a first circular hole 1216, all the second branches 1214 of the at least two shielding combs 121 surround to form a second circular hole 1218, and a part of each second branch 1214 is located in the first circular hole 1216. Of course, the shielding member 120 forms a hollow structure, which is not limited to the first circular hole 1216 and the second circular hole 1218. There is also a gap between the first branches 1212 and the second branches 1214 of each shielding comb 121.

[0054] It should be noted that the two shielding combs 121 form an avoiding space 1213 to avoid the device for temperature detection. In addition, the second circular hole 1218 formed by the at least two shielding combs 121 is used to avoid or place the device for detecting whether the heated object is on the electromagnetic heating device, and the second circular hole 1218 can also reduce the area of the shielding member 120.

[0055] For example, please refer to Figure 4 and Figure 5 as shown, Figure 4Another perspective view of the shielding member of the electromagnetic heating assembly provided by the embodiments of the present application is shown in FIG. 13B. Figure 5 As shown in FIG. 13A, Figure 1 A cross-sectional view of the electromagnetic heating assembly along A-A is shown in FIG. 13C. Each shielding comb 121 further includes a grounding bracket 1219 connected with the connecting strip 1210, such as being bently connected. The grounding bracket 1219 is used to ground the shielding comb 121, such as being in contact with the whole machine ground, so that the electrical energy absorbed and converted by the shielding comb 121 flows into the ground, thereby enhancing the shielding effect.

[0056] The grounding bracket 1219 is also used to mount or fix the shielding comb 121, such as being clampedly connected with the coil disc 130.

[0057] For example, the coil disc 130 includes a main body 131 and a support column 132. The main body 131 has a U-shaped slot on one side for placing the coil 110. The support column 132 is connected with the side of the main body 131 away from the coil 110, and the support column 132 is located at the edge of the main body 131. The number of the support column 132 is at least two to jointly support the main body 131.

[0058] The clamped connection of the grounding bracket 1219 with the coil disc 130 is achieved by the U-shaped hole on the grounding bracket 1219 and the clamping sleeve connection of the support column 132. In addition, the grounding bracket 1219, the connecting strip 1210, the plurality of first branches 1212 and the plurality of second branches 1214 form a clamping groove to be clamped with the main body 131. The grounding bracket 1219 is also bent to adapt to the shape of the main body 131 to fit the main body 131. Thus, the shielding comb 121 and the coil disc 130 can be double-clamped and fixed, improving the firmness of the installation of the shielding comb 121.

[0059] Therefore, the grounding bracket 1219 can realize the installation of the shielding comb 121 and also be reused to ground the shielding comb 121, reducing the device settings in the electromagnetic heating assembly 100 and reducing the cost.

[0060] For example, referring to Figure 6 as shown in FIG. 13D, Figure 6 An exploded view of another structure of the electromagnetic heating assembly provided by the embodiments of the present application is shown in FIG. 13E. The electromagnetic heating assembly 100 further includes an insulating member 140 arranged on at least one side of the shielding member 120 to fix and insulate the shielding member 120 in a combined form. The insulating member 140 can be a mica sheet, which has the functions of insulation and low-loss thermal resistance, so it can insulate and resist heat for the shielding member 120.

[0061] For example, the insulating piece 140 includes a first mica sheet 141 and a second mica sheet 142, which are respectively located on both sides of the shielding piece 120 and are respectively attached to the shielding piece 120. On the one hand, the shielding piece 120 can be insulated and heat-insulated, and interference with other devices can be prevented. On the other hand, the shielding piece 120 can also be fixed and supported, and the risk of deformation of the shielding piece 120 can be reduced.

[0062] The shapes of the first mica sheet 141 and the second mica sheet 142 can be adapted to the shape of the shielding piece 120, such as the shielding piece 120 being a circular sheet, and the first mica sheet 141 and the second mica sheet 142 also being circular sheets. The first mica sheet 141 and the second mica sheet 142 are provided with circular holes at positions corresponding to the second circular hole 1218, which are used to avoid or place devices for detecting whether the heating piece is on the electromagnetic heating device.

[0063] Please refer to Figure 7 and Figure 8 , Figure 7 the electromagnetic interference test diagram of the coil without the shielding piece provided by the embodiment of the present application, Figure 8 the electromagnetic interference test diagram of the electromagnetic heating assembly provided by the embodiment of the present application. The electromagnetic interference test is performed on the electromagnetic heating assembly 100 with the shielding piece 120, which is compared with the electromagnetic interference test of the coil without the shielding piece. It can be seen that the EMI CE test data exceeds the FCC limit value before the shielding measure is increased, and the CE test data does not exceed the FCC limit value after the shielding piece 120 is added in the embodiment of the present application. Therefore, it can be concluded that the shielding effect of the shielding piece 120 of the embodiment of the present application is better.

[0064] The embodiment of the present application also provides an electromagnetic heating device, which can be an electromagnetic heating rice cooker, an electromagnetic stove or an electromagnetic kettle, etc. The electromagnetic stove is taken as an example for description. The electromagnetic heating device includes the above-mentioned electromagnetic heating assembly. The specific structure of the electromagnetic heating assembly is referred to the above-mentioned embodiments. Since the electromagnetic heating device adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by all the technical solutions of the above-mentioned embodiments, which will not be described here.

[0065] In the above-mentioned embodiments, the description of each embodiment has its own emphasis. The parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0066] In the description of the present application, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more features.

[0067] The electromagnetic heating assembly and the electromagnetic heating device provided by the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. An electromagnetic heating assembly, characterized by, The electromagnetic heating assembly comprises: a coil having a first side for setting a piece to be heated; a shielding member covering the first side of the coil, the shielding member comprising at least two shielding combs arranged uniformly in a circle.

2. The electromagnetic heating assembly of claim 1, wherein, Each of the shielding combs comprises: a connecting strip in an arc shape; a plurality of first branches arranged in a fan shape along the connecting strip and connected to the connecting strip respectively; a plurality of second branches arranged in a fan shape along the connecting strip, the plurality of second branches being connected to the connecting strip respectively; and the plurality of second branches being arranged in a staggered manner with the plurality of first branches.

3. The electromagnetic heating assembly of claim 2, wherein, The length of the second branch is greater than the length of the first branch.

4. The electromagnetic heating assembly of claim 3, wherein, The width of the second branch is equal to the width of the first branch.

5. The electromagnetic heating assembly of claim 2, wherein, The distance between adjacent first branches and second branches ranges from 0.5 mm to 4 mm.

6. The electromagnetic heating assembly of claim 2, wherein, All the first branches of the at least two shielding combs form a first circular hole, and all the second branches of the at least two shielding combs form a second circular hole, and a part of each second branch is located in the first circular hole.

7. The electromagnetic heating assembly of claim 2, wherein, Each of the shielding combs further comprises: a grounding bracket connected to the connecting strip, the grounding bracket being used for grounding the shielding comb.

8. The electromagnetic heating assembly according to any one of claims 1 to 7, characterized in that The material of the at least two shielding combs is aluminum, copper or steel.

9. The electromagnetic heating assembly of claim 8, wherein, The electromagnetic heating assembly further comprises an insulating member arranged on at least one side of the shielding member.

10. An electromagnetic heating device, characterized by The electromagnetic heating assembly comprises any one of claims 1 to 9. The electromagnetic heating assembly comprises any one of claims 1 to 9.

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