Electromagnetic oven
By covering the induction cooker coil with a shield made of conductive silicone, the electromagnetic interference problem during the operation of the induction cooker is solved, and regulatory certification and compatibility with other devices are achieved.
Patent Information
- Application Number
- CN202520017124.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-01-03
AI Technical Summary
The electromagnetic interference generated by induction cookers during operation can affect the normal operation of other electronic devices and is difficult to pass regulatory certification.
A shield made of conductive silicone material is placed over the coil of the induction cooker to shield some of the electromagnetic waves generated by the coil's magnetic field, thereby reducing interference with other electronic devices.
It effectively shields electromagnetic interference, meets regulatory certification requirements, and reduces the structural design difficulty of the shielding component and its impact on coil operation.
Smart Images
Figure CN223882398U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of electromagnetic stoves, and particularly relates to an electromagnetic stove. BACKGROUND
[0002] An electromagnetic stove is a kind of household kitchen appliances. The coil is a core component in the electromagnetic stove. The coil generates an alternating magnetic field through a control circuit. When the magnetic field passes through a to-be-heated piece 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 stove generates electromagnetic interference when working, which affects the normal work of other electronic devices. CONTENT
[0004] The application provides an electromagnetic stove which can reduce the influence of electromagnetic interference on other electronic devices.
[0005] The application provides an electromagnetic stove, which comprises:
[0006] a coil having a first side for arranging a to-be-heated piece;
[0007] a shielding piece covering the first side of the coil, and the shielding piece is made of conductive silica gel.
[0008] Optionally, the volume resistivity of the shielding piece ranges from 2Ω / cm 2 to 16Ω / cm 2 .
[0009] Optionally, the thickness of the shielding piece ranges from 0.2 mm to 0.9 mm.
[0010] Optionally, the shielding piece is in the shape of a circular ring sheet.
[0011] Optionally, the shielding piece comprises a first silica gel layer, a second silica gel layer and a shielding layer, and the shielding layer is arranged between the first silica gel layer and the second silica gel layer.
[0012] Optionally, the shielding piece comprises a third silica gel layer and a plurality of shielding particles, and the plurality of shielding particles are arranged in the third silica gel layer.
[0013] Optionally, the material of the shielding layer or the shielding particles is metal or carbon.
[0014] Optionally, the shielding piece comprises at least two shielding sheets, and the at least two shielding sheets are arranged uniformly along the circumference.
[0015] Optionally, the electromagnetic stove further comprises:
[0016] An insulating piece is arranged at least on one side of the shielding piece.
[0017] Optionally, the electromagnetic oven further comprises:
[0018] A coil disc has a mounting groove for accommodating the coil.
[0019] At least one mounting clip has a clamping groove clamped to the outer side of the coil disc and the shielding piece to fix the shielding piece on the coil disc.
[0020] In the electromagnetic oven of the embodiment, the shielding piece is arranged on the coil to shield at least part of electromagnetic waves generated by the coil magnetic field, thereby reducing the influence of electromagnetic interference on other electronic devices. In addition, the shielding piece is made of conductive silica gel, which can reduce the structural design difficulty of the shielding piece on the basis of ensuring the shielding effect and less influence on the coil operation, compared with the shielding piece made of metal material and designed with a pattern. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used 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 on the basis of these drawings.
[0022] 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.
[0023] Figure 1 A structural schematic diagram of the electromagnetic oven provided by the embodiment of the present application.
[0024] Figure 2 A first structural schematic diagram of the shielding piece provided by the embodiment of the present application.
[0025] Figure 3 A second structural schematic diagram of the shielding piece provided by the embodiment of the present application.
[0026] Figure 4 A third structural schematic diagram of the shielding piece provided by the embodiment of the present application.
[0027] Figure 5 A fourth structural schematic diagram of the shielding piece provided by the embodiment of the present application.
[0028] Figure 6 An explosive structural schematic diagram of the electromagnetic oven provided by the embodiment of the present application.
[0029] Figure 7 Another structural schematic diagram of the electromagnetic oven provided by the embodiment of the present application.
[0030] Figure 8 For Figure 7 A cross-sectional structural schematic diagram of the electromagnetic oven shown along A-A.
[0031] Figure 9 A structural schematic diagram of the mounting clamp provided by the embodiment of the present application.
[0032] Figure 10 An electromagnetic interference test diagram of the coil without shielding member provided by the embodiment of the present application.
[0033] Figure 11 An electromagnetic interference test diagram of the electromagnetic oven provided by the embodiment of the present application. DETAILED DESCRIPTION
[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. 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.
[0035] The electromagnetic oven generates electromagnetic interference when working, which may affect the normal work of other electronic devices. The electromagnetic interference problem mainly reflects in the conduction disturbance and the space radiation disturbance. If no effective optimization measures are taken in the design, the electromagnetic oven will not pass the FCC, CCC, CE and other regulations certification. The coil is a core component in the electromagnetic oven. The coil generates low-frequency (20KHZ to 25KHZ) alternating magnetic field through the control circuit. When the magnetic field passes through the to-be-heated member such as the 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 the food. The low-frequency alternating current generated by the control circuit of the electromagnetic oven is the source of electromagnetic interference, and the coil radiates outward.
[0036] In order to reduce the electromagnetic interference generated by the electromagnetic oven when working, the embodiment of the present application provides an electromagnetic oven, which will be described below with reference to the drawings.
[0037] Please refer to Figure 1 shown, Figure 1 A structural schematic diagram of the electromagnetic oven provided by the embodiment of the present application. The embodiment of the present application provides an electromagnetic oven 100, which includes a coil 110, a shielding member 120 and a coil disc 130.
[0038] The coil 110 generates an alternating magnetic field through a control circuit or in a power-on state. When the magnetic field passes through the heating 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 current current causes the pot to heat up, thereby heating the food.
[0039] The coil 110 has a first side X for arranging the heating object and a second side Y opposite to the first side X. It can be understood that the first side X and the second side are artificially defined for the convenience of description, and should not be understood as a limitation on the coil 110.
[0040] 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. For example, the material of the shielding member 120 is conductive silicone. The metal or carbon in the conductive silicone can block part of the frequency of the magnetic field generated by the coil, thereby achieving a 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 arrange a mounting groove, such as a meander-shaped groove. The meander-shaped groove can not only accommodate and support the coil 110, but also isolate the coil 110 of different layers, and can regularize the shape of the magnetic field radiated by the coil 110.
[0042] In the electromagnetic oven 100 provided by the embodiment of the present application, the shielding member 120 is arranged on the coil 110 to shield at least part of the electromagnetic waves generated by the magnetic field of the coil 110, thereby reducing the influence of electromagnetic interference on other electronic devices. In addition, the material of the shielding member 120 is conductive silicone. Compared with the shielding member made of metal material and designed with a pattern, the shielding member 120 can reduce the difficulty of structural design on the basis of ensuring the shielding effect and less influence on the coil 110.
[0043] It should be noted that the material of the shielding member 120 of the embodiment of the present application is conductive silicone with a small volume resistivity. The volume resistivity of the conductive silicone is controlled to be much larger than that of ordinary metal. In addition, the conductive silicone does not contain magnetism, that is, it is less affected by the magnetic field. When the coil 110 is normally working, the magnetic field generated by the coil 110 generates less eddy current heating of the conductive silicone. Therefore, the shielding member 120 generates less heat or no heat, which can improve the working performance of the electromagnetic oven 100. In addition, the conductive silicone with low volume resistivity or the shielding member 120 can ensure the penetration of low-frequency magnetic field and block high-frequency electromagnetic waves. This is because the higher the frequency of electromagnetic waves, the weaker the penetration ability. The low-frequency magnetic field is the magnetic field used for heating by the coil 110. Therefore, the shielding member 120 made of conductive silicone can shield high-frequency electromagnetic waves with less influence on the coil 110, thereby preventing the interference of high-frequency electromagnetic waves on other electronic devices.
[0044] For example, the volume resistivity of the shield 120 can be 4 Ω / cm. 2 Up to 16Ω / cm 2 The selection range is flexible; for example, the volume resistivity of shielding component 120 can be chosen to be 4 Ω / cm. 2 5Ω / cm 2 8Ω / cm 2 10Ω / cm 2 12Ω / cm 2 Or 16Ω / cm 2 .
[0045] It should be noted that, in order to balance the shielding effect and heat generation of the shielding component 120, the thickness of the shielding component 120 also needs to be considered, as the number of conductive particles in the shielding component 120 varies with different thicknesses. For example, the thickness of the shielding component 120 ranges from 0.2 mm to 0.9 mm; for instance, the thickness of the shielding component 120 can be selected as 0.2 mm, 0.3 mm, 0.5 mm, 0.8 mm, or 0.9 mm.
[0046] Taking into account both the shielding effect and heat generation of the shielding component 120, in one implementation of this application embodiment, the volume resistivity of the shielding component 120 is 10 Ω / cm. 2 The shielding component 120 has a thickness of 0.5 mm. While ensuring that low-frequency magnetic fields can penetrate, it blocks high-frequency radiation signals, thereby optimizing electromagnetic interference without affecting the normal operation of the induction cooker 100.
[0047] The shielding component 120 of this application embodiment has at least two structural configurations.
[0048] Please combine Figure 1 And see Figure 2 As shown, Figure 2 This is a schematic diagram of a first structure of the shielding component provided in this application embodiment. In this first structure, the shielding component 120 includes a first silicone layer 121, a second silicone layer 122, and a shielding layer 123. The shielding layer 123 is sandwiched between the first silicone layer 121 and the second silicone layer 122, that is, the first silicone layer 121, the shielding layer 123, and the second silicone layer 122 are stacked. The material of the shielding layer 123 can be metal or carbon; the metal can be aluminum, copper, or steel. During manufacturing, the first silicone layer 121 can be cast first, then the shielding layer 123 can be placed on the first silicone layer 121, and finally the second silicone layer 122 can be cast.
[0049] Please combine Figure 1 And see Figure 3 As shown, Figure 3A second structure of the shielding member is shown in the embodiment of the present application. In the second structure, the shielding member 120 comprises a third silica gel layer 124 and a plurality of shielding particles 125, and the plurality of shielding particles 125 are dispersed in the third silica gel layer 124. The material of the shielding particles 125 is metal or carbon, such as aluminum, copper or steel. In the manufacturing of the shielding member 120, the metal powder or carbon powder can be doped in the third silica gel layer 124, or the carbon paste can be printed in the third silica gel layer 124.
[0050] For example, as shown in Figure 4 , Figure 4 A third structure of the shielding member is shown in the embodiment of the present application. The shielding member 120 is in the form of a circular ring sheet, and the shielding member 120 is provided with a circular hole 126 for avoiding or placing a device for detecting whether the heating object is on the electromagnetic oven 100.
[0051] For example, as shown in Figure 5 , Figure 5 A fourth structure of the shielding member is shown in the embodiment of the present application. In an embodiment, the shielding member 120 can be in the form of a split, for example, the shielding member 120 comprises at least two shielding sheets 127, and the at least two shielding sheets 127 are uniformly arranged along the circumference. The distance between the adjacent two shielding sheets 127 should not be too large, and the distance that can prevent the interference between the adjacent two shielding sheets 127 is enough to reduce the risk of poor shielding effect. The shielding member 120 in the form of a split can facilitate the replacement of the shielding member 120 when the shielding effect of the partial area of the shielding member 120 is reduced, and the entire shielding member does not need to be replaced, which can reduce the cost.
[0052] For example, when the shielding member 120 comprises two shielding sheets 127, the two shielding sheets 127 are arranged at intervals along the circumference, such as symmetrically arranged, and a regular circle can be formed, which can reduce the positioning difficulty and facilitate the assembly on the basis of covering the coil 110; for another example, when the shielding member 120 comprises three shielding sheets 127, the three shielding sheets 127 are arranged in an array along the circumference, and a regular circle can also be formed; for another example, when the shielding member 120 comprises four shielding sheets 127, the four shielding sheets 127 are arranged at intervals and in an array along the circumference, and a regular circle can also be formed.
[0053] The number of the shielding sheets 127 can be set as needed, such as considering that the thickness of the shielding sheet 127 is small, and if the size in the circumferential direction is large, the shielding sheet 127 is easy to be deformed, which affects the shielding effect. In the embodiment of the present application, the shielding member 120 comprises four shielding sheets 127, which can balance the stability of the structure and the shielding effect.
[0054] It should be noted that, please continue to refer to Figure 4 andFigure 5 As shown, the shielding member 120 can further be provided with a clearance space 128 for avoiding devices for temperature detection.
[0055] Referring to Figure 6 As shown, Figure 6 An explosion structure schematic diagram of the electromagnetic oven provided by the embodiment of the present application is shown. As an example, the electromagnetic oven 100 further comprises an insulating member 140 provided on at least one side of the shielding member 120 to realize the insulation and heat resistance of the coil 110 after the shielding member 120 is added. The insulating member 140 can be a mica sheet, which has the functions of insulation and low-loss heat resistance, so as to insulate and resist heat for the shielding member 120 and the coil 110.
[0056] For example, the insulating member 140 comprises a first mica sheet 141 and a second mica sheet 142, which are respectively located on the two sides of the shielding member 120 and are respectively attached to the shielding member 120. On the one hand, the first mica sheet 141 and the second mica sheet 142 can insulate and resist heat for the shielding member 120 and the coil 110, so as to prevent interference with other devices. On the other hand, the first mica sheet 141 and the second mica sheet 142 can also fix and support the shielding member 120, so as to reduce the risk of deformation of the shielding member 120.
[0057] The shapes of the first mica sheet 141 and the second mica sheet 142 can be adapted to the shape of the shielding member 120, such as the shielding member 120 being a round sheet, the first mica sheet 141 and the second mica sheet 142 can also be round sheets, and the first mica sheet 141 and the second mica sheet 142 are also provided with round holes corresponding to the round holes 126, which are used to avoid or place devices for detecting whether the heating object is on the electromagnetic oven 100.
[0058] Referring to Figures 7 to 9 As shown, Figure 7 Another structure schematic diagram of the electromagnetic oven provided by the embodiment of the present application is shown, Figure 8 As Figure 7 A cross-sectional structure schematic diagram of the electromagnetic oven shown along A-A is shown, Figure 9 A structure schematic diagram of the mounting clip provided by the embodiment of the present application is shown. As an example, the electromagnetic oven 100 further comprises at least one mounting clip 150, each of which has a clamping groove clamped on the outside of the coil disc 130 and the shielding member 120, so as to fix the shielding member 120 on the coil disc 130.
[0059] The coil disc 130 includes a main body 131 and a support column 132. The main body 131 is provided with an installation groove or a U-shaped groove on one side, and the installation groove is used for placing the coil 110. The support column 132 is connected to 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, and the support column 132 is used for supporting the main body 131 together.
[0060] In an implementation manner, all the installation clips 150 can be connected to the shielding member 120 in a bending manner to form a clamping groove, and the installation clip 150 can be bent to adapt to the shape of the coil disc 130 to fit the coil disc 130. In addition, the end of the installation clip 150 away from the shielding member 120 can be provided with a U-shaped groove, and the U-shaped groove is used for clamping the support column 132 in the coil disc 130, so that the shielding member 120 and the coil disc 130 can be clamped and fixed in a double manner, and the installation stability of the shielding member 120 is improved.
[0061] In addition, the installation clip 150 can be reused as a device for grounding the shielding member 120, the device setting in the electromagnetic oven 100 is reduced, and the cost can be reduced. The shielding member 120 is grounded, the eddy current generated by the shielding member 120 due to the magnetic field is led out, and the shielding effect is improved.
[0062] Please refer to Figure 10 and Figure 11 , Figure 10 the electromagnetic interference test diagram of the coil without the shielding member provided in the embodiment of the present application, Figure 11 the electromagnetic interference test diagram of the electromagnetic oven. The electromagnetic interference of the electromagnetic oven 100 provided with the shielding member 120 is tested, and the electromagnetic interference of the coil without the shielding member is tested. 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 member 120 is added in the embodiment of the present application. Therefore, it can be concluded that the shielding effect of the shielding member 120 in the embodiment of the present application is better.
[0063] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.
[0064] In the description of the present application, the terms “first” and “second” are only used for description 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.
[0065] The electromagnetic stove provided by the embodiments of the present application is 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 oven, characterized by, The electromagnetic oven 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 being made of conductive silicone.
2. The electromagnetic stove according to claim 1, characterized in that, The shielding has a volume resistivity in the range of 2 Ω / cm 2 to 16 Ω / cm 2 range.
3. The electromagnetic stove according to claim 2, characterized in that, The thickness of the shielding member ranges from 0.2mm to 0.9mm.
4. The electromagnetic stove according to claim 3, characterized in that, The shielding member is in the shape of a circular ring.
5. The electromagnetic stove according to claim 2, characterized in that, The shielding member comprises a first silicone layer, a second silicone layer and a shielding layer, the shielding layer being sandwiched between the first silicone layer and the second silicone layer.
6. The electromagnetic stove according to claim 5, characterized in that, The shielding layer is made of metal or carbon.
7. The electromagnetic stove according to claim 2, characterized in that, The shielding member comprises at least two shielding pieces, which are uniformly arranged along the circumference.
8. The electromagnetic stove according to claim 1, characterized in that, The electromagnetic oven further comprises: an insulating member, which is arranged on at least one side of the shielding member.
9. The electromagnetic stove according to claim 8, characterized in that, The electromagnetic oven further comprises: a coil disc, having a mounting groove for accommodating the coil; at least one mounting clip, each of which has a clamping groove for clamping the outer side of the coil disc and the shielding member, so as to fix the shielding member on the coil disc.