CN118055533A

CN118055533A - Electromagnetic heating coil assembly and cooking utensil

Info

Publication number: CN118055533A
Application number: CN202211478497.9A
Authority: CN
Inventors: 李小艳
Original assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2024-05-17

Abstract

The invention discloses an electromagnetic heating coil assembly and a cooking utensil, wherein the electromagnetic heating coil assembly comprises a mounting seat and at least two coil windings, the two coil windings are arranged on the mounting seat at intervals, the two coil windings are adjacently arranged to form a first coil section which is mutually close to each other, when the two coil windings are electrified, the current directions of the two first coil sections are consistent, a high-frequency alternating magnetic field can be generated between the two first coil sections, the area corresponds to the central area of the bottom of the cooking utensil, a heating blind area does not exist in the middle of the electromagnetic heating device, the current directions of wires on two opposite sides of the area close to the central part of a coil disc are prevented from being reversely arranged when wires of a single coil winding are wound, and the problem that the central area of the conventional electromagnetic heating device has the heating blind area can not be solved.

Description

Electromagnetic heating coil assembly and cooking utensil

Technical Field

The invention relates to the field of household appliances, in particular to an electromagnetic heating coil assembly and a cooking utensil.

Background

Electromagnetic heating utilizes alternating current to generate an alternating magnetic field which is continuously changed through a coil, and eddy current is generated in a conductor of the alternating magnetic field, which is caused by driving carriers in the conductor to move by a vortex electric field. The joule effect of the swirling current increases the temperature of the conductor, thereby effecting heating.

The coil is generally wound with the wire and is the form of coil panel, and the coil panel central part can exist the heating blind area, and generally when heating the pan, the pan can place in the region that the coil panel is close to the centre, so make electromagnetic heating's device heating efficiency not high.

Disclosure of Invention

The invention mainly aims to provide an electromagnetic heating coil assembly and a cooking utensil, and aims to solve the problem that a heating blind area exists in the central area of an existing electromagnetic heating device.

To achieve the above object, the present invention provides an electromagnetic heating coil assembly, wherein the electromagnetic heating coil assembly includes:

A mounting base; and

The two coil windings are adjacently arranged so as to be provided with a first coil section which is close to each other, and the two first coil sections are arranged in such a way that the current directions of the two first coil sections are consistent when the two coil windings are electrified.

Optionally, the two coil windings are arranged side by side at a distance in the lateral direction, and the two first coil sections are each arranged extending in the longitudinal direction.

Optionally, both of the first coil sections have a curved section located remote from each other.

Optionally, the curved section is arranged in an arc shape.

Optionally, each coil winding includes a first coil and a second coil, the second coil is enclosed on the periphery of the first coil, and the first coil and the second coil are arranged at intervals, so that an annular interval area is formed between the first coil and the second coil;

The projection area of the first coil on the mounting seat is S1, the projection area of the second coil on the mounting seat is S2, and the projection area of the annular area on the mounting seat is S3, wherein S3/(S1+S2) is less than or equal to 0.6.

Optionally, a non-wiring area is formed between the two second coils, and the projection area of the non-wiring area corresponding to the mounting seat is S4, wherein S4 is less than or equal to S2.

Optionally, the two coil windings are arranged in series.

Optionally, the two coil windings include:

The first coil winding is provided with a first input end, a first winding and a first output end, the first winding is sequentially wound outwards from the first input end along a first time needle direction, and the first output end is connected with the outer end of the first winding; and

The second coil winding is provided with a second input end, a second winding and a second output end, the second winding is sequentially and inwards wound from the second input end along a second clockwise direction opposite to the first clockwise direction, and the second output end is connected with the inner end of the second winding.

Optionally, the mounting base is provided with a winding slot, and the two coil windings are disposed in the winding slot.

Optionally, the electromagnetic heating coil assembly further comprises a temperature controller arranged on the mounting seat, and the temperature controller is electrically connected with the two coil windings to control the two coil windings to work.

Optionally, both the first coil sections have a curved section disposed away from each other;

the temperature controller is arranged in the middle area of at least one of the two coil windings, and/or the temperature controller is arranged in the area between the two bending sections.

Optionally, the number of turns of each coil winding is N, where N is less than or equal to 3.

The present invention also provides a cooking appliance including an electromagnetic heating coil assembly including:

A mounting base; and

According to the technical scheme provided by the invention, by arranging at least two coil windings, when the two coil windings are electrified, the current directions of the two first coil sections are consistent, a high-frequency alternating magnetic field can be generated between the two first coil sections, the area corresponds to the central area of the bottom of the pot, so that a heating blind area does not exist in the middle part of the electromagnetic heating device, the situation that when wires of a single coil winding are wound, the current directions of wires on two opposite sides of the area close to the central part of a coil panel are reversely arranged, and the high-frequency alternating magnetic field cannot be generated is solved, and the problem that the heating blind area exists in the central area of the traditional electromagnetic heating device is solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an electromagnetic heating coil assembly of the prior art;

FIG. 2 is a schematic diagram of an electromagnetic heating coil assembly according to an embodiment of the present invention;

FIG. 3 is a schematic view of the first coil, the second coil and the annular region of FIG. 2 in a projection area of the mount;

FIG. 4 is a schematic diagram of an embodiment of the winding direction of the first coil winding and the second coil winding in FIG. 2;

Fig. 5 is a schematic structural diagram of another embodiment of an electromagnetic heating coil assembly according to the present invention.

Reference numerals illustrate:

Reference numerals	Name of the name	Reference numerals	Name of the name
				100	Electromagnetic heating coil assembly	20	First coil section
1	Mounting base	201	Bending section
				2	Coil winding	21	First coil winding
2a	First coil	22	Second coil winding
				2b	Second coil

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

Electromagnetic heating utilizes alternating current to generate an alternating magnetic field which is continuously changed through a coil, and eddy current is generated in a conductor of the alternating magnetic field, which is caused by driving carriers in the conductor to move by a vortex electric field. The joule effect of the swirling current increases the temperature of the conductor, thereby effecting heating. Referring to fig. 1, the coil is generally formed by winding a wire in a coil disc shape, a heating blind area exists at the center of the coil disc, and when the pan is heated, the pan is generally placed in an area of the coil disc close to the middle, so that the heating efficiency of the electromagnetic heating device is not high.

In order to solve the above-mentioned problems, the present invention provides an electromagnetic heating coil assembly 100, and fig. 1 to 5 illustrate an embodiment of the electromagnetic heating coil assembly 100 according to the present invention.

Referring to fig. 2 and 3, the electromagnetic heating coil assembly 100 includes a mounting base 1 and at least two coil windings 2, the two coil windings 2 are arranged at intervals on the mounting base 1, and the two coil windings 2 are arranged adjacently to have a first coil section 20 arranged close to each other, and the two first coil sections 20 are arranged such that when the two coil windings 2 are energized, the current directions of the two first coil sections 20 are identical.

According to the technical scheme provided by the invention, by arranging at least two coil windings 2, when the two coil windings 2 are electrified, the current directions of the two first coil sections 20 are consistent, a high-frequency alternating magnetic field can be generated between the two first coil sections 20, the area corresponds to the central area of the bottom of the pot, so that a heating blind area does not exist in the middle of an electromagnetic heating device, the situation that when wires of a single coil winding 2 are wound, the current directions of wires on two opposite sides of the area close to the central part of a coil panel are reversely arranged, and a high-frequency alternating magnetic field cannot be generated is avoided, and the problem that a heating blind area exists in the central area of the traditional electromagnetic heating device is solved.

It will be appreciated that in another embodiment, four coil windings 2 may be arranged in an array, referring to fig. 5, the coil sections of each adjacent two coil windings 2 that are close to each other are arranged such that when the two coil windings 2 are energized, the current directions of the two first coil sections 20 are identical, so that an effective high-frequency alternating magnetic field can be generated between the four coil windings 2, and the coil sections of the four coil windings 2 that are close to each other can be arranged corresponding to the middle of the pot, or the centers of the four coil windings 2 can be arranged corresponding to the middle of the pot. Of course, the number of the coil windings 2 may be set according to actual requirements, for example, the induction cooker corresponding to the split head may be provided with the two coil windings 2 in the corresponding area of each head.

The shape of each coil winding 2 may be a circular coil disc or a square coil disc. Considering that when a plurality of circular coil panels are arranged side by side, coil sections of two coil windings 2 close to each other are not arranged in parallel, so that the situation that the magnetic field distribution in the area between the coil sections of the two coil windings 2 close to each other is uneven exists, and four sides of the square coil panels are straight lines, when a plurality of square coil panels are arranged side by side, the coil sections of the two coil windings 2 close to each other can be arranged in parallel, so that the magnetic field distribution in the area between the coil sections of the two coil windings 2 close to each other is more uniform, therefore, in the embodiment, the shape of the coil windings 2 is preferably arranged in a square shape, and when the cooking appliance is a square induction cooker, or a strip induction cooker, or a frying and roasting machine, the shape of the heating panel is matched with the shape of the heating panel of the cooking appliance, so that a more uniform alternating magnetic field can be generated everywhere of the heating panel, and the heating of the cooking appliance is more uniform. For example, when the steak is fried, the coverage area of the steak covering the pot is larger, so that the steak is heated uniformly everywhere.

In particular, in the present embodiment, the two coil windings 2 are arranged at a distance from each other in the lateral direction, and the two first coil sections 20 are each arranged to extend in the longitudinal direction. In this way, the distance between the two first coil sections 20 is a constant distance value, and the magnetic fields distributed near the two first coil sections 20 are more uniform, so that the alternating magnetic fields corresponding to the areas acting on the middle of the pot are more uniform.

Further, since the temperature controller is provided when the electromagnetic heating device heats the pot, in order to avoid the influence of the high-frequency alternating magnetic field generated when the coil winding 2 is energized on the temperature controller, in this embodiment, both the first coil sections 20 have a bending section 201 that is disposed away from each other. In this way, a thermostat can be arranged between the two curved sections 201 while meeting the actual demands and while affecting the normal heating as little as possible. The shape and size of the two bending sections 201 can be adjusted according to practical situations.

Further, because the temperature controller is generally disposed in the mounting groove or the mounting cavity on the mounting base 1, the temperature controller is limited by the wall of the mounting groove or the mounting cavity, so that for convenience in processing, the peripheral wall of the mounting groove or the mounting cavity is generally disposed in an arc shape, and the coil winding 2 is wound around the area corresponding to the temperature controller, in this embodiment, the curved section 201 is disposed in an arc shape.

Further, since the maximum current density occurs inside the coil conductor when the alternating current passes through the toroidal coil, the magnetic force lines are concentrated inside the toroidal coil, dispersed outside the toroidal coil, and a part of the magnetic force lines also pass through the conductor itself inside, so that the current lines on the outer high-frequency heater side are more cross-linked than the current lines on the inner side, and the generated counter electromotive force is also large, so that the total potential on the outer side and the current density are smaller than those on the inner side, and in order to effectively avoid the toroidal effect, please refer to fig. 3, in this embodiment, each of the coil windings 2 includes a first coil 2a and a second coil 2b, the second coil 2b is surrounded on the periphery of the first coil 2a, and the first coil 2a and the second coil 2b are arranged at intervals to form a toroidal interval therebetween, so that the aggregation heating of the intermediate magnetic field can be prevented from being uneven. Specifically, the interval between the first coil 2a and the second coil 2b is too large or too small, so that the magnetic field is easily insufficient or concentrated, in order to enable the magnetic field of each region of the whole coil assembly to reach a relatively uniform magnetic field, the projection area of the first coil 2a on the mounting seat 1 is S1, the projection area of the second coil 2b on the mounting seat 1 is S2, and the projection area of the annular region on the mounting seat 1 is S3, wherein S3/(s1+s2) is less than or equal to 0.6.

Specifically, since the two coil windings 2 are arranged at intervals on the mounting base 1, and therefore, the two second coils 2b are arranged at intervals, in this embodiment, a non-wiring area is formed between the two second coils 2b, and of course, in order to avoid uneven heating due to aggregation of the intermediate magnetic field, the area of the non-wiring area corresponding to the mounting base 1 is S4, where S4 is equal to or less than S2.

Further, in order to make the two first coil sections 20 be arranged such that the current directions of the two first coil sections 20 are identical when the two coil windings 2 are energized, the two coil windings 2 may be arranged in parallel or in series, and in order to make the electrical connection and control relationship of the two coil windings 2 simpler, in this embodiment, the two coil windings 2 are arranged in series. So set up, only need just through a temperature control device just can control simultaneously two coil windings 2 to, when processing production is around establishing two coil windings 2, can take shape two coil windings 2 in proper order, need not to carry out electric connection operation such as welding again.

Specifically, in the case where the two coil windings 2 are arranged in series, the winding directions of the two coil windings 2 are related to the current directions of the two first coil sections 20, referring to fig. 4, in this embodiment, the two coil windings 2 include a first coil winding 21 and a second coil winding 22, the first coil winding 21 has a first input end, a first winding and a first output end, the first winding is wound outward from the first input end in sequence along a first time needle direction, and the first output end is connected to the outer end of the first winding. After the first coil winding 21 is wound, the first output end of the first coil winding 21 can be extended to the input end of the outer side of the second coil winding 22, winding is started to form the second coil winding 22, the second coil winding 22 is provided with a second input end, a second winding and a second output end, the second winding is sequentially wound inwards from the second input end along a second clockwise direction opposite to the first clockwise direction, and the second output end is connected with the inner end of the second winding. In this way, it is possible to realize that the two first coil sections 20 are arranged such that the current directions of the two first coil sections 20 coincide when the two coil windings 2 are energized, in a series connection of the two coil windings 2.

It will be appreciated that the second clockwise direction is counter-clockwise when the first time needle direction is clockwise and the second clockwise direction is clockwise when the first time needle direction is counter-clockwise. Therefore, the winding directions of the two coil windings are opposite to each other.

It will be appreciated that the first winding may also be wound inwardly from the first input end in sequence along the first time-needle direction, the first output end is connected to the inner end of the first winding, the second winding is wound outwardly from the second input end in sequence along the second time-needle direction, and the second output end is connected to the outer end of the second winding, so that winding can also achieve that the current directions of the two first coil sections 20 are identical when the two first coil sections 20 are energized.

Specifically, in the present embodiment, the mounting base 1 is provided with a winding groove, and the two coil windings 2 are disposed in the winding groove. The two coil windings 2 can thus be limited in the limiting groove and are also easy to machine.

Specifically, in this embodiment, the electromagnetic heating coil assembly 100 further includes a temperature controller disposed on the mounting base 1, where the temperature controller can sense the magnetic flux of the magnetic field or the temperature around the magnetic field, and the temperature controller is electrically connected to the two coil windings 2, and can control and regulate the heating power of the two coil windings 2 according to the magnetic flux or the temperature, so as to control the two coil windings 2 to work.

In particular, since each of the coil windings 2 may also be regarded as a single coil disc, the middle of each of the coil windings 2 may also have a heating dead zone, so that the thermostat may be arranged in this region, avoiding being affected by the alternating magnetic field, in an embodiment the thermostat is arranged in the middle region of at least one of the two coil windings 2, in another embodiment the thermostat is arranged in the region between two of the curved sections 201. In yet another embodiment, a thermostat may be provided in both the central region of the two coil windings 2 and the region between the two curved sections 201, it being understood that the thermostat is not limited to temperature sensors, hall sensors or other sensors, but may also be a circuit board assembly and electronic components associated with the thermostat.

In particular, since the number of winding turns is increased with the core unchanged, a larger inductance and more abundant electric power can be provided, which is a benefit, but an increase in internal resistance is a disadvantage. With the windings unchanged, the thin sheet core has less magnetic eddy current, lower loss, and higher frequency. However, the number of voids is large, the magnetic circuit is long, and the number of turns of each coil winding 2 is N in this embodiment, where N is equal to or less than 3, in order to obtain a large inductance and to achieve a sufficient loss.

The invention also provides a cooking appliance which can be an induction cooker, a cooking machine, a dish frying machine, an electric cooker, an electric pressure cooker product and the like, and the cooking appliance comprises the electromagnetic heating coil assembly 100, and the specific structure of the electromagnetic heating coil assembly 100 refers to the embodiment because the electromagnetic heating coil assembly 100 of the cooking appliance adopts all the technical schemes of all the embodiments, so that the cooking appliance at least has all the beneficial effects brought by the technical schemes of the embodiment and is not repeated herein.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

1. An electromagnetic heating coil assembly, comprising:

A mounting base; and

2. The electromagnetic heating coil assembly of claim 1, wherein the two coil windings are laterally spaced apart side-by-side, and the two first coil segments are each disposed longitudinally extending.

3. The electromagnetic heating coil assembly of claim 1, wherein both of said first coil sections have a curved section disposed away from each other.

4. The electromagnetic heating coil assembly of claim 3, wherein the curved section is arcuate in configuration.

5. The electromagnetic heating coil assembly of claim 1, wherein each of the coil windings comprises a first coil and a second coil, the second coil being disposed around the periphery of the first coil and the first coil being spaced apart from the second coil to form an annular spacer therebetween;

6. The electromagnetic heating coil assembly of claim 5, wherein a non-wiring region is formed between the two second coils, the non-wiring region corresponding to an area S4 at the mount, wherein S4 is less than or equal to S2.

7. The electromagnetic heating coil assembly of claim 1, wherein the two coil windings are arranged in series.

8. The electromagnetic heating coil assembly of claim 7, wherein two of said coil windings comprise:

9. The electromagnetic heating coil assembly of claim 1, wherein the mount is provided with a winding slot in which the two coil windings are disposed.

10. The electromagnetic heating coil assembly of claim 1, further comprising a temperature controller disposed on the mounting base, the temperature controller being electrically connected to the two coil windings to control operation of the two coil windings.

11. The electromagnetic heating coil assembly of claim 10, wherein both of said first coil sections have a curved section disposed away from each other;

The temperature controller is provided in a middle region of at least one of the two coil windings, and/or in a region between the two bent sections 201.

12. The electromagnetic heating coil assembly of claim 1, wherein each of the coil windings has a number of turns N, wherein N is equal to or less than 3.

13. A cooking appliance comprising an electromagnetic heating coil assembly as claimed in any one of claims 1 to 12.