Induction cooker and method for improving energy efficiency of induction cooker

Abstract

The invention relates to an induction cooker and a method for improving the energy efficiency of the induction cooker. The induction cooker comprises a coil, a magnetic core and a uniform magnetic radiator; the uniform magnetic radiator comprises a first magnetic pole and a second magnetic pole; the coil is wound on the magnetic core, and one end of the magnetic core is magnetically coupled with the first magnetic pole, and the other end is magnetically coupled with the second magnetic pole; when the induction cooker is working, the magnetic pot body is placed above the uniform magnetic radiator, the coil excites a magnetic field in the magnetic core, and a magnetic circuit is formed through the magnetic core, the first magnetic pole, the magnetic pot body and the second magnetic pole; the invention arranges a magnetic core in the coil so that the magnetic field is concentrated in the magnetic core, and a magnetic field with the same effect can be excited by passing less current through the coil, thereby improving the efficiency of the coil in exciting the magnetic field and reducing copper loss; the magnetic flux lines passing through the uniform magnetic radiator are kept uniform by setting the uniform magnetic radiator, so that the magnetic pot body is uniformly heated; a complete magnetic circuit is formed by the magnetic core, the magnetic conductor and the uniform magnetic radiator, thereby reducing magnetic resistance, improving heating efficiency and reducing leakage magnetic pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of induction cookers, and in particular to an induction cooker and a method for improving the energy efficiency of the induction cooker. Background Art

[0002] Household induction cookers are widely used due to their simple structure and easy use.

[0003] The existing problems of household induction cookers are: 1) The magnetic circuit design is unreasonable, and the copper loss is too large, which affects the working efficiency; 2) The unreasonable distribution of the heating magnetic field leads to uneven heating; 3) The magnetic resistance of the magnetic circuit is too large and difficult to drive, resulting in low circuit driving efficiency, which not only affects energy consumption but also causes leakage magnetic pollution.

[0004] Therefore, it is necessary to adopt new methods and devices to overcome the defects existing in the prior art. Summary of the invention

[0005] The present invention aims at the technical problems existing in the prior art and provides an induction cooker and a method for improving the energy efficiency of the induction cooker, reducing the copper loss in the circuit and making the induction cooker heat the pot evenly.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: an induction cooker for improving the energy efficiency of the induction cooker, comprising a coil, a magnetic core and a uniform magnetic radiator; the uniform magnetic radiator comprises a first magnetic pole and a second magnetic pole; the coil is wound on the magnetic core, and one end of the magnetic core is magnetically coupled with the first magnetic pole, and the other end is magnetically coupled with the second magnetic pole; when the induction cooker is working, the magnetic pot body is placed above the uniform magnetic radiator, and the uniform magnetic radiator forms a radiation surface that radiates energy to the magnetic pot body toward the top of the magnetic pot body; the coil excites a magnetic field in the magnetic core, and forms a magnetic circuit through the magnetic core, the first magnetic pole, the magnetic pot body, and the second magnetic pole.

[0007] The beneficial effects of the present invention are as follows:

[0008] (1) By arranging a magnetic core in the coil, the magnetic field is concentrated inside the magnetic core. Less current can be passed through the coil to excite a magnetic field with the same effect, thereby improving the efficiency of the coil in exciting the magnetic field and reducing copper loss.

[0009] (2) The uniform magnetic radiator is provided to keep the magnetic flux lines passing through the uniform magnetic radiator uniform, thereby uniformly heating the magnetic pot;

[0010] (3) A complete magnetic circuit is formed by the magnetic core and the uniform magnetic radiator, which reduces magnetic resistance, improves heating efficiency, and reduces leakage magnetic pollution.

[0011] Based on the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the radiation surface area of ​​the uniform magnetic radiator is not less than four times the cross-sectional area of ​​the magnetic core.

[0013] The beneficial effects of adopting the above further scheme are: the second magnetic pole heats the magnetic pot body over a large area through electromagnetic radiation on the upper surface, thereby reducing the cross-sectional area of ​​the magnetic core, so that the same number of turns can be wound with a shorter coil, and the same intensity of magnetic field can be excited, thereby reducing the copper loss on the coil; at the same time, the uniform magnetic radiator and the magnetic pot body adopt a large-area coupling, which increases the area where eddy currents are generated in the magnetic pot body, correspondingly increases the average length of the eddy current loop, increases the resistance that the eddy current has to overcome, thereby improving the efficiency of eddy currents in generating heat energy, thereby improving energy efficiency.

[0014] Furthermore, the second magnetic pole is a horizontally arranged uniform magnetic disk; the first magnetic pole is a uniform magnetic ring and horizontally surrounds the uniform magnetic disk; the top surfaces of the uniform magnetic disk and the uniform magnetic ring are both radiation surfaces of the uniform magnetic radiator.

[0015] Furthermore, the thickness of the leveling disk gradually decreases toward the edge.

[0016] The beneficial effect of adopting the above further scheme is: the beneficial effect of adopting the above further scheme is: the uniform magnetic disk is thick in the center and thin at the edge, which can weaken the radiation of the second magnetic pole to the center of the magnetic pot body, and further make the uniform magnetic radiator heat the magnetic pot body evenly.

[0017] Furthermore, the relative magnetic permeability of the uniform magnetic disk is greater than 10 and less than 200.

[0018] The beneficial effect of adopting the above further solution is that by using a material with low magnetic permeability to make the magnetic disk, the thickness of the magnetic disk can be increased, which is convenient for processing.

[0019] Furthermore, when the induction cooker is working, a gap is provided between the radiation surface of the uniform magnetic radiator and the magnetic conductive pot body.

[0020] The beneficial effect of adopting the above further solution is that the change of the position of the magnetic conductive pot on the induction cooker does not seriously affect the magnetic field distribution and the heating effect.

[0021] Furthermore, the magnetic core is axially and horizontally placed below the uniform magnetic radiator.

[0022] The beneficial effect of adopting the above further solution is: the coil and the magnetic core occupy less space, saving space inside the induction cooker and being able to effectively reduce the height of the induction cooker.

[0023] Furthermore, one end of the magnetic core is connected to the first magnetic pole through a first magnetic conductor, and the other end is connected to the second magnetic pole through a second magnetic conductor, so that the two ends of the magnetic core are magnetically coupled to the first magnetic pole and the second magnetic pole respectively.

[0024] The present invention also proposes a method for improving the energy efficiency of an induction cooker, comprising arranging a magnetic core in a coil, arranging a first magnetic pole and a second magnetic pole on the top of the induction cooker, and magnetically coupling the two ends of the magnetic core with the first magnetic pole and the second magnetic pole respectively; when the induction cooker is working, a magnetic pot body is placed above the first magnetic pole and the second magnetic pole, and the first magnetic pole and the second magnetic pole face the top of the magnetic pot body to form a radiation surface that radiates energy toward the magnetic pot body, and the electromagnetic energy excited by the coil in the magnetic core is transferred to the magnetic pot body through the radiation surface.

[0025] Furthermore, the diameter of the magnetic core is much smaller than its length, and the magnetic core is axially and horizontally arranged below the uniform magnetic radiator; and the coil is tightly wound on the magnetic core.

[0026] The beneficial effect of adopting the above further solution is that it is helpful to reduce the height of the induction cooker. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a first embodiment of an induction cooker of the present invention;

[0028] Figure 2 It is a structural schematic diagram of a second embodiment of an induction cooker of the present invention;

[0029] Figure 3 yes Figure 2 Sectional view at AA in the middle;

[0030] Figure 4 yes Figure 2 Sectional view at CC;

[0031] Figure 5 yes Figure 2 Sectional view at DD in the middle;

[0032] Figure 6 The invention discloses a distribution diagram of magnetic flux lines when an induction cooker heats a magnetic pot.

[0033] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0034] 1. magnetic pot body, 2. uniform magnetic radiator, 21. uniform magnetic ring, 22. uniform magnetic disk, 3. magnetic core, 4. coil, 5. first magnetic conductor, 6. second magnetic conductor, 7. non-magnetic plate. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0036] Embodiment 1

[0037] This embodiment provides an induction cooker and a method, wherein the induction cooker manufactured by the method is as follows: Figure 1 As shown, it includes a coil 4, a magnetic core 3, a uniform magnetic radiator 2 and a non-magnetic conductive plate 7. The uniform magnetic radiator 2 includes a first magnetic pole and a second magnetic pole that are magnetically coupled, and in this embodiment, the second magnetic pole is a uniform magnetic disk 22 that is horizontally arranged, and the first magnetic pole is a uniform magnetic ring 21, and surrounds the uniform magnetic disk 22 on the same horizontal plane.

[0038] The uniform magnetic radiator 2 can also adopt the method of multiple magnetic circuits and multiple magnetic poles. For example, the uniform magnetic radiator 2 can be set as two magnetic poles that do not surround each other, or multiple magnetic poles that do not surround each other. The uniform magnetic radiator 2 can also be elliptical, square, rectangular or other complex shapes and is not limited to a circle. No limitation is made here. However, the structure of the annular uniform magnetic ring 21 surrounding the disc-shaped uniform magnetic disk 22 in this embodiment is better, so that the magnetic flux lines can be evenly divergent from the center of the uniform magnetic disk 22 to the surrounding uniform magnetic rings 21. And in this embodiment, the uniform magnetic ring 21 may not be a closed ring.

[0039] By providing the uniform magnetic radiator 2 , the magnetic field distribution formed on the magnetic conductive pot body 1 can be controlled by the uniform magnetic radiator 2 . Figure 6 : is a distribution diagram of magnetic flux lines when the induction cooker of the present invention heats the magnetic pot body 1, as shown in FIG. Figure 6 As shown, the uniform magnetic radiator 2 can form a relatively uniform magnetic field on the magnetic pot body 1, so that relatively uniform eddy currents are generated on the circular ring of any radius at the bottom of the magnetic pot body 1, so that the induction cooker heats the magnetic pot body 1 more evenly.

[0040] The coil 4 is wound on the magnetic core 3, and the magnetic core 3 is axially and horizontally arranged below the uniform magnetic disk 22, and one end of the magnetic core 3 is connected to the uniform magnetic ring 21 through the first magnetic conductor 5, and the other end is connected to the center of the uniform magnetic disk 22 through the second magnetic conductor 6. The coil 4 excites a magnetic field in the magnetic core 3, and forms a complete magnetic circuit through the magnetic core 3, the first magnetic conductor 5, the uniform magnetic ring 21, the magnetic pot body 1, the uniform magnetic disk 22, and the second magnetic conductor 6, reducing magnetic resistance, and most of the electromagnetic radiation is radiated to the magnetic pot body 1 through the upper surface of the uniform magnetic disk 22, thereby improving the heating efficiency and reducing magnetic leakage pollution.

[0041] The surfaces of the uniform magnetic disk 22 and the uniform magnetic ring 21 facing the magnetic pot body 1 are both radiation surfaces, radiating electromagnetic fields to the magnetic pot body 1, so the top surfaces of the uniform magnetic disk 22 and the uniform magnetic ring 21 are both used as the radiation surfaces of the uniform magnetic radiator 2. The radiation surface area of ​​the uniform magnetic radiator 2 is much larger than the cross-sectional area of ​​the magnetic core 3, so the uniform magnetic disk 22 can transform the "point-shaped magnetic pole" into a "surface-shaped magnetic pole", which can greatly increase the radiation surface area of ​​the uniform magnetic radiator 2. When the magnetic conductive medium between the uniform magnetic radiator 2 and the magnetic pot body 1 is the same, the magnetic resistance is inversely proportional to the area of ​​the radiation surface and proportional to the magnetic conductive distance, so the uniform magnetic radiator 2 and the magnetic pot body 1 are coupled in a large area and small spacing manner, which can greatly reduce the magnetic resistance between the uniform magnetic radiator 2 and the magnetic pot body 1, greatly increase the magnetic flux density between the uniform magnetic radiator 2 and the magnetic pot body 1, reduce the magnetic flux lost at the non-gap, and reduce the radiation dissipated outward. In addition, the uniform magnetic radiator 2 and the magnetic pot body 1 are coupled over a large area, which increases the area of ​​the eddy current generated in the magnetic pot body 1, correspondingly increases the average length of the eddy current loop, increases the resistance that the eddy current has to overcome, thereby improving the efficiency of the eddy current generating heat energy, thereby improving the energy efficiency.

[0042] In addition, a gap is provided between the uniform magnetic radiator 2 and the magnetic pot body 1. Preferably, a non-magnetic plate 7 can be provided between the uniform magnetic radiator 2 and the magnetic pot body 1, and the non-magnetic plate 7 is close to the uniform magnetic radiator 2 and the magnetic pot body 1. The non-magnetic plate 7 of fixed thickness allows the magnetic pot body 1 to be arranged above the uniform magnetic radiator 2 at intervals. The thickness of the non-magnetic body 7 is uniform, so that the distance between the uniform magnetic radiator 2 and the magnetic pot body 1 is equal everywhere. When a magnetic pot body 1 of different materials is used or the magnetic pot body 1 moves on the non-magnetic plate 7, the distance between the magnetic pot body 1 and the uniform magnetic radiator 2 can be kept unchanged, so that the magnetic resistance between the magnetic pot body 1 and the uniform magnetic radiator 2 is relatively stable, so that the magnetic pot body 1 can heat the food stably. The non-magnetic plate 7 can also be provided with a heat insulation layer to prevent the heat generated by the eddy current in the magnetic pot body 1 from being transferred to the uniform magnetic radiator 2, thereby improving the heating efficiency of the food.

[0043] Since the upper surfaces of the uniform magnetic disk 22 and the uniform magnetic ring 21 serve as the radiation surface to heat the magnetic pot body 1, the heating area depends on the area of ​​the radiation surface, so the winding radius of the coil 4 does not need to be very large. The magnetic core 3 adopts a thin neck structure with a diameter much smaller than the length, and the coil 4 is tightly wound on the magnetic core 3, so that the same number of turns can be wound with a shorter coil to excite the same intensity of magnetic field, reducing the copper loss on the coil 4. Specifically, the area of ​​the radiation surface of the uniform magnetic radiator 2 is not less than four times the cross-sectional area of ​​the magnetic core 3. For example, when the upper surface area of ​​the uniform magnetic disk 22 is sixteen times the cross-sectional area of ​​the magnetic core 3, the length of the coil 4 can be reduced to one-fourth of the original length. And because the length of the coil 4 is reduced, the resistance of the coil 4 is also reduced accordingly, so the heating power of the coil 4 is reduced, the energy lost in the coil 4 is reduced, and the service life of the coil 4 is extended.

[0044] Since the magnetic core 3 adopts a thin neck structure, the diameter of the magnetic core 3 is much smaller than the length, and the winding radius of the coil 4 is small, and the winding diameter of the coil 4 is smaller than its winding length, the magnetic core 3 and the coil 4 are axially and horizontally arranged below the uniform magnetic radiator 2, which can effectively reduce the height of the induction cooker. At the same time, the first magnetic conductor 5 and the second magnetic conductor 6 are both single magnetic conductors, and the two ends of the magnetic core 3 are only connected to one point at the bottom of the uniform magnetic ring 21 and one point at the bottom of the uniform magnetic disk 22 through the first magnetic conductor 5 and the second magnetic conductor 6 respectively. The first magnetic conductor 5, the magnetic core 3 and the second magnetic conductor 6 are in a linear shape as a whole, and most of the space in the induction cooker forms a large, complete and connected space below and on both sides of the coil 4 without being divided, which is convenient for use and can easily free up space for arranging the circuit board. In addition, the lower end of the uniform magnetic disk 22 can be notched or thinned for placing the coil 4, further reducing the height of the induction cooker. Other methods can also be used to further reduce the height of the induction cooker, such as using a flat magnetic core 3 and a flat coil 4.

[0045] An annular air gap is provided between the uniform magnetic ring 21 and the uniform magnetic disk 22. The air gap can increase the magnetic resistance of the magnetic circuit and reduce the magnetic flux forming the magnetic circuit between the uniform magnetic ring 21 and the uniform magnetic disk 22, so that the magnetic flux excited from the magnetic core 3 can form a circuit through the magnetic conductive pot body 1 as much as possible, thereby improving the utilization efficiency of the magnetic field excited from the magnetic core 3.

[0046] The thickness of the edge of the uniform magnetic disk 22 is smaller than the thickness in the center, which can weaken the radiation of the uniform magnetic disk 22 to the center of the magnetic pot body 1, and further make the uniform magnetic radiator 2 heat the magnetic pot body 1 uniformly. The uniform magnetic disk 22 can be made into a disk shape with a thickness gradually decreasing toward the edge, or the thickness of the edge of the uniform magnetic disk 22 can be suddenly reduced through a stepped structure, or both methods can be used at the same time. However, making the uniform magnetic disk 22 into a disk shape with a thickness gradually decreasing toward the edge can gradually weaken the radiation of the uniform magnetic disk 22 to the magnetic pot body 1 from the edge to the center, which is the best choice.

[0047] The magnetic shim 22 is made of a material with low magnetic permeability, and its magnetic permeability is less than that of the magnetic core 3, the first magnetic conductor 5 and the magnetic shim ring 21. At the same time, the low magnetic permeability of the magnetic shim 22 should not be too small. Preferably, the relative magnetic permeability of the magnetic shim 22 is greater than 10 and less than 200. If the magnetic shim 22 is made of a material with high magnetic permeability, the thickness of the magnetic shim 22 is too small, which is not convenient for processing. Therefore, the magnetic shim 22 is made of a material with low magnetic permeability, which can increase the thickness of the magnetic shim 22 and facilitate processing.

[0048] In addition, the non-magnetic plate 7 and uniform magnetic radiator 2 of this embodiment can also be set as replaceable components. Different non-magnetic plates 7 and uniform magnetic radiators 2 can be replaced according to the magnetic pot body 1 of different calibers and different materials to adapt to the magnetic pot body 1 of different calibers and different materials.

[0049] Embodiment 2

[0050] This embodiment is different from the first embodiment in that Figure 2 As shown, the coil 4 is wound on the magnetic core 3, and the magnetic core 3 is axially and vertically arranged below the shim disk 22, the upper end of the magnetic core 3 is directly connected to the center of the shim disk 22, and the lower end of the magnetic core 3 is connected to the shim ring 21 through the first magnetic conductor 5. The coil 4 excites a magnetic field in the magnetic core 3, and a magnetic circuit is formed through the magnetic core 3, the first magnetic conductor 5, the shim ring 21, and the shim disk 22.

[0051] In this embodiment, the upper surface of the magnetic plate 22 can also release most of the electromagnetic radiation to the magnetic pot body 1, and generate uniform eddy currents in the magnetic pot body 1, so as to uniformly heat the magnetic pot body 1. However, since the coil 4 is placed vertically, the space occupied by the coil 4 and the magnetic core 3 is increased, thereby greatly increasing the height of the induction cooker. In addition, if Figure 5 As shown, the first magnetic conductors 5 radially arranged in all directions divide the space in the induction cooker into a plurality of scattered parts, which is not convenient for utilizing the space in the induction cooker and is not conducive to the arrangement of the circuit board.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An induction cooker for improving the energy efficiency of the induction cooker, characterized in that: The invention comprises a coil, a magnetic core and a uniform magnetic radiator; the uniform magnetic radiator comprises a first magnetic pole and a second magnetic pole; the coil is wound on the magnetic core, and one end of the magnetic core is magnetically coupled with the first magnetic pole, and the other end is magnetically coupled with the second magnetic pole; when the induction cooker is working, the magnetic pot body is placed above the uniform magnetic radiator, and the uniform magnetic radiator forms a radiation surface for radiating energy to the magnetic pot body toward the top of the magnetic pot body; one end of the magnetic core is connected to the first magnetic pole through the first magnetic conductor, and the other end is connected to the second magnetic pole through the second magnetic conductor, so that the two ends of the magnetic core are magnetically coupled with the first magnetic pole and the second magnetic pole respectively; the coil excites a magnetic field in the magnetic core, and forms a magnetic circuit through the magnetic core, the first magnetic pole, the magnetic pot body and the second magnetic pole.

2. The induction cooker for improving the energy efficiency of the induction cooker according to claim 1, characterized in that: The radiation surface area of ​​the uniform magnetic radiator is not less than four times the cross-sectional area of ​​the magnetic core.

3. The induction cooker for improving the energy efficiency of the induction cooker according to claim 1, characterized in that: The second magnetic pole is a horizontally arranged uniform magnetic disk; the first magnetic pole is a uniform magnetic ring and horizontally surrounds the uniform magnetic disk; the top surfaces of the uniform magnetic disk and the uniform magnetic ring facing the magnetic conductive pot body are both radiation surfaces of the uniform magnetic radiator.

4. The induction cooker for improving the energy efficiency of the induction cooker according to claim 3, characterized in that: The thickness of the leveling disk gradually decreases toward the edge.

5. The induction cooker for improving the energy efficiency of the induction cooker according to claim 3, characterized in that: The relative magnetic permeability of the uniform magnetic disk is greater than 10 and less than 200.

6. The induction cooker for improving the energy efficiency of the induction cooker according to claim 1, characterized in that: When the induction cooker is working, a gap is arranged between the radiation surface of the uniform magnetic radiator and the magnetic conductive pot body.

7. The induction cooker for improving the energy efficiency of the induction cooker according to claim 1, characterized in that: The magnetic core is axially and horizontally placed below the uniform magnetic radiator.

8. A method for improving the energy efficiency of an induction cooker using the induction cooker according to any one of claims 1 to 7, characterized in that: The invention comprises arranging a magnetic core in a coil, arranging a first magnetic pole and a second magnetic pole on the top of an induction cooker, and magnetically coupling two ends of the magnetic core with the first magnetic pole and the second magnetic pole respectively; when the induction cooker is working, placing a magnetic pot body above the first magnetic pole and the second magnetic pole, and the first magnetic pole and the second magnetic pole are oriented toward the top of the magnetic pot body to form a radiation surface for radiating energy toward the magnetic pot body, and transferring the electromagnetic energy excited by the coil in the magnetic core to the magnetic pot body through the radiation surface.

9. The method for improving the energy efficiency of an induction cooker according to claim 8, characterized in that: The diameter of the magnetic core is much smaller than its length, and the magnetic core is axially and horizontally arranged below the uniform magnetic radiator; the coil is tightly wound on the magnetic core.

Images