A coil and magnetic strip assembly structure and electric heating equipment

Abstract

The present invention provides a coil and magnetic stripe assembly structure and electric heating equipment, including: a coil, arranged in a circular shape; a magnetic stripe group, including a plurality of magnetic stripes, and the plurality of magnetic stripes are arranged on the coil; wherein the coil and the magnetic stripe group satisfy: m(a‑0.06r)+l(0.11l‑0.23r)+r(b‑0.22r)+n(c+1.12r‑n)≥617, wherein: m represents the width of the magnetic stripe, r represents the distance from the end of the magnetic stripe close to the center of the coil to the center of the coil; l represents the length of the magnetic stripe; n represents the number of the magnetic stripes; wherein, 6≤a≤7, 22≤b≤23, 37≤c≤38. Through the above-mentioned setting method, when the coil size is determined, the number, size and placement position of the magnetic stripes are limited, and then the maximum thermal efficiency can be achieved under the premise of a certain coil power. Through experiments, when the above-mentioned setting method is adopted, the thermal efficiency in the present invention is improved.

Description

Technical Field

[0001] The invention relates to the technical field of electric heating equipment, and in particular to an assembly structure of a coil and a magnetic stripe and an electric heating equipment. Background Art

[0002] IH rice cookers are cooking appliances that heat food using the principle of electromagnetic induction. The working principle is that current flows through the excitation coil, generating an alternating magnetic field around the coil wire. When a magnetic metal pot is placed on the stove, the magnetic lines of force pass through the pot, generating eddy currents, which form eddy current heat to heat the food in the pot. IH rice cookers have the advantages of fast heating, high thermal efficiency, and precise temperature control.

[0003] In order to achieve a better heating effect and improve the utilization efficiency of magnetic lines of force, magnetic strips are added under the coils during IH heating. The magnetic strips have high magnetic permeability and can gather the magnetic lines of force diverging from the coils, increase the magnetic field strength acting on the pot body, and thus increase the heating efficiency. Most of the current products add strip magnetic strips, which are radially distributed under the coils and span the width of the coils. The strip magnetic strips have the advantages of easy sintering and assembly; however, because the coils are spiral planar coils, the magnetic field distribution at the bottom is not uniform, so in the selection of the number, size and placement of the strip magnetic strips, the role of the strip magnetic strips should be maximized to maximize the concentration of magnetic lines of force at the bottom of the pot to achieve the effect of improving thermal efficiency. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of low thermal efficiency caused by poor magnetic strip size and placement position in the prior art.

[0005] To this end, the present invention provides a coil and magnetic stripe assembly structure, comprising: a coil, arranged in a circular shape; a magnetic stripe assembly, comprising a plurality of magnetic stripes, wherein the plurality of magnetic stripes are arranged on the coil; wherein the coil and the magnetic stripe assembly satisfy:

[0006] m(a-0.06r)+l(0.11l-0.23r)+r(b-0.22r)+n(c+1.12rn)≥617, where:

[0007] m represents the width of the magnetic stripe, r represents the distance from the end of the magnetic stripe close to the center of the coil to the center of the coil; l represents the length of the magnetic stripe; n represents the number of the magnetic stripes;

[0008] Among them, 6≤a≤7, 22≤b≤23, 37≤c≤38.

[0009] In the assembly structure provided by the present invention, the distance from the side of the coil away from the center to the center of the coil is R, wherein l+r≥R.

[0010] In the assembly structure provided by the present invention, m≤2r×tan(180° / n).

[0011] In the assembly structure provided by the present invention, 0.15≤r / R≤0.4.

[0012] The assembly structure provided by the present invention has a width of 20 mm ≤ r ≤ 45 mm.

[0013] In the assembly structure provided by the present invention, 4≤n≤6.

[0014] In the assembly structure provided by the present invention, a protrusion is provided on a side of the magnetic strip away from the coil.

[0015] In the assembly structure provided by the present invention, an end magnetic strip is arranged on a side of the magnetic strip close to the coil, and the end magnetic strip is arranged at at least one end of the magnetic strip.

[0016] The present invention also provides an electric heating device, comprising: the coil and magnetic strip assembly structure provided by the present invention.

[0017] The electric heating device provided by the present invention is an electric rice cooker.

[0018] The technical solution of the present invention has the following advantages:

[0019] 1. The coil and magnetic stripe assembly structure provided by the present invention comprises: a coil arranged in a circular shape; a magnetic stripe assembly comprising a plurality of magnetic stripes, wherein the plurality of magnetic stripes are arranged on the coil; wherein the coil and the magnetic stripe assembly satisfy:

[0020] m(a-0.06r)+l(0.11l-0.23r)+r(b-0.22r)+n(c+1.12rn)≥617, wherein: m represents the width of the magnetic stripe, r represents the distance from the end of the magnetic stripe close to the center of the coil to the center of the coil; l represents the length of the magnetic stripe; n represents the number of the magnetic stripes; wherein, 6≤a≤7, 22≤b≤23, 37≤c≤8.

[0021] Through the above-mentioned setting method, when the coil size is determined, the number, size and placement of the magnetic strips are limited, so that the maximum thermal efficiency can be achieved under the premise of a certain coil power. Through experiments, when the above-mentioned setting method is adopted, the thermal efficiency in the present invention is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure of the coil and magnetic strip assembly provided by the present invention;

[0024] Figure 2 for Figure 1 The structural schematic diagram of the magnetic strip shown;

[0025] Figure 3 A schematic diagram of the structure of another magnetic strip provided by the present invention;

[0026] Figure 4 The present invention provides a function and thermal efficiency variation trend diagram of the coil and magnetic strip assembly structure.

[0027] Description of reference numerals:

[0028] 1. Coil; 2. Magnetic strip; 3. Raised portion; 4. End magnetic strip. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Example 1

[0034] This embodiment provides a coil and magnetic strip assembly structure, such as Figure 1 and Figure 2 As shown, including:

[0035] The coil 1 is arranged in a circular shape. In this embodiment, the coil can also be arranged in other shapes;

[0036] Specifically, the coil itself adopts a common structure in the prior art. The coil itself is arranged in a circular shape, and a connector connected to a power source is arranged on it and is suitable for being connected to an alternating current.

[0037] A magnetic stripe group, comprising a plurality of magnetic stripes 2, wherein the plurality of magnetic stripes 2 are arranged on the coil; wherein the coil and the magnetic stripe group satisfy:

[0038] m(a-0.06r)+l(0.11l-0.23r)+r(b-0.22r)+n(c+1.12rn)≥617, where: m represents the value of the width of the magnetic stripe, r represents the value of the distance from the end of the magnetic stripe close to the center of the coil to the center of the coil; l represents the value of the length of the magnetic stripe; n represents the number of the magnetic stripes;

[0039] Among them, a, b, and c are all constants, 6≤a≤7, 22≤b≤23, 37≤c≤38.

[0040] In this embodiment, preferably, a=6.78, b=22.1, and c=37.4.

[0041] In this embodiment, there are multiple magnetic strips, and the multiple magnetic strips are distributed on the coil in a regular or irregular shape. Figure 1 As shown, in this embodiment, a plurality of magnetic strips are arranged radially, and the inner end of each magnetic strip is arranged toward the center direction of the coil.

[0042] Through the above-mentioned setting method, when the coil size is determined, the number, size and placement of the magnetic strips are limited, so that the maximum thermal efficiency can be achieved under the premise of a certain coil power. Through experiments, when the above-mentioned setting method is adopted, the thermal efficiency is increased to 86%.

[0043] In the national standard, the thermal efficiency of the second-level energy efficiency of rice cookers larger than 1000 watts is usually set at 86%. Figure 4 From the recorded content, it can be seen that in the function provided above, after calculating the thermal efficiency corresponding to different function values, it can be seen that when it corresponds to Figure 4 After point A, that is, when the function value exceeds 617, the corresponding thermal efficiency will be increased to 86%. At the same time, as the function value continues to increase, the thermal efficiency gradually increases. That is, when the magnetic strip is set according to the function provided in this embodiment, the requirements of the second-level energy efficiency can be fully met. At the same time, through necessary adjustments, the requirements of the first-level energy efficiency or even higher energy efficiency can be further met.

[0044] In the assembly structure provided by this embodiment, m≤2r×tan(180° / n). Specifically, in the assembly structure provided by this embodiment, 4≤n≤6.

[0045] In the assembly structure provided in this embodiment, 0.15≤r / R≤0.4. Specifically, in this embodiment, 20mm≤r≤45mm.

[0046] In the assembly structure provided by this embodiment, a protrusion is provided on a side of the magnetic strip away from the coil.

[0047] like Figure 3 As shown, by providing the raised portion 3, the magnetic strip can withstand more magnetic flux density. After the magnetic strip is installed on the coil, the magnetic flux density of the coil portion corresponding to the raised portion 3 is larger. At this time, according to Gauss's law, a larger magnetic flux can be generated, thereby more effectively improving the heating efficiency of the bottom of the cookware; at the same time, since the thickness of the raised portion is greater than the thickness of other parts of the magnetic strip, when the total volume of the magnetic strip is inconvenient, the thickness of other parts of the magnetic strip is transferred to the raised portion, thereby effectively increasing the utilization efficiency of the magnetic strip itself without changing the material.

[0048] In the assembly structure provided in this embodiment, an end magnetic strip 4 is arranged on a side of the magnetic strip close to the coil, and the end magnetic strip is arranged at at least one end of the magnetic strip.

[0049] Specifically, the end magnetic strip 4 can be arranged at the inner diameter position of the coil, or at the outer diameter position of the coil, or at both ends of the coil.

[0050] By additionally setting the end magnetic strips, during use, at least one end magnetic strip is set on the inner side and / or outer side of the coil. For the coil, the density of the closed magnetic lines of force located on the outer side of the coil is less than the density of the closed magnetic lines of force located on the inner side of the coil. Through the above-mentioned setting method, the corresponding magnetic flux density outside the coil is less than the corresponding magnetic flux density inside the coil, thereby achieving full utilization of the closed magnetic lines of force.

[0051] In the assembly structure provided in this embodiment, the distance from the side of the coil away from the center to the center of the coil is R, where l+r≥R.

[0052] Specifically, in this embodiment, the coil itself can be directly configured as a circle, in which case the radius of any position on the outer edge of the coil is R; as a deformation, the coil can also be configured in the form of a regular polygon, such as a square, a regular hexagon, etc., in which case R will be adjusted within a certain range.

[0053] In this embodiment, the coil itself is arranged in a circular shape. When no end magnetic strip is arranged on the magnetic strip, l+r=R. When the end magnetic strip 4 is arranged, since the end magnetic strip 4 itself has a certain thickness, one end of the end magnetic strip will protrude to the outside of the coil. At this time, l+r>R.

[0054] Example 2

[0055] This embodiment provides an electric heating device, including the coil and magnetic strip assembly structure provided in Embodiment 1.

[0056] In this embodiment, the coil and magnetic stripe assembly structure can be applied in different electromagnetic heating scenarios, and the electric heating device itself can be an electromagnetic cooker, an IH electric kettle, an IH soymilk maker, etc. Correspondingly, when the electric heating device is an electromagnetic cooker, the coil and magnetic stripe assembly structure provided in Example 1 is arranged inside the shell. When the electric heating device is an IH electric kettle or an IH soymilk maker, the coil and magnetic stripe assembly structure is arranged below the body to be heated, and the electric heating body itself is made of metal material, such as stainless steel, etc., and a variety of ingredients that need to be heated, such as water, beans, rice, and cereals, can be placed inside the electric heating body.

[0057] In this embodiment, the electric heating device is an electric rice cooker. Specifically, the electric rice cooker comprises a housing, an inner pot is arranged in the housing, a coil and a magnetic strip assembly structure are arranged in the inner pot, an inner pot is arranged above the coil, and food is cooked through the inner pot.

[0058] By adopting the coil and magnetic strip assembly structure provided in Example 1, the thermal efficiency of the entire electric heating device can be fully improved, thereby effectively reducing the overall energy consumption while ensuring normal processing.

[0059] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A coil and magnetic strip assembly structure, characterized in that: include: Coil; A magnetic stripe group, comprising a plurality of magnetic stripes, wherein the plurality of magnetic stripes are connected to the coil; Wherein, the coil and the magnetic stripe group satisfy: m(a-0.06r)+l(0.11l-0.23r)+r(b-0.22r)+n(c+1.12rn)≥617, where: m represents the value of the width of the magnetic stripe, r represents the value of the distance from the end of the magnetic stripe close to the center of the coil to the center of the coil; l represents the value of the length of the magnetic stripe; n represents the number of the magnetic stripes; Among them, a, b, and c represent constants, where 6≤a≤7, 22≤b≤23, and 37≤c≤38.

2. The assembly structure according to claim 1, characterized in that: The distance from the side of the coil away from the center to the center of the coil is R, where l+r≥R.

3. The assembly structure according to claim 1 or 2, characterized in that: in: m≤2r×tan(180° / n).

4. The assembly structure according to claim 1 or 2, characterized in that: 0.15≤r / R≤0.4。 5. The assembly structure according to claim 4, characterized in that: 20mm≤r≤45mm.

6. The assembly structure according to claim 1, characterized in that: 4≤n≤6。 7. The assembly structure according to claim 1, characterized in that: A protrusion is arranged on a side of the magnetic strip away from the coil.

8. The assembly structure according to claim 7, characterized in that: An end magnetic strip is arranged on one side of the magnetic strip close to the coil, and the end magnetic strip is arranged at at least one end of the magnetic strip.

9. An electric heating device, characterized in that: include: The coil and magnetic strip assembly structure as described in any one of claims 1 to 8.

10. The electric heating device according to claim 9, characterized in that: The electric heating device is an electric rice cooker.

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