Design method of electric heating assembly and electric heating appliance

Abstract

The application discloses a design method of an electric heating assembly and an electric heating appliance. The design method is based on a given outer diameter and comprises the following steps: step 1, designing N heating rings; a first heating ring is designed, a first ring plate is designed first, the given outer diameter is taken as the outer diameter of the first ring plate, half of the given outer diameter is taken as the inner diameter of the first ring plate, and then a first heating wire is continuously wound on the first ring plate; a second heating ring is designed, a second ring plate is designed first, the inner diameter of the first ring plate is taken as the outer diameter of the second ring plate, half of the outer diameter of the second ring plate is taken as the inner diameter of the second ring plate, and then a second heating wire is continuously wound on the second ring plate; and step 2, sequentially sleeving the N heating rings to form an electric heating assembly. In this way, the electric heating assembly with the largest power is combined in a multi-layer cascading mode, different powers are easy to control, and the method is especially suitable for the scene of thin plate-shaped single-side or double-side heating.

Description

Technical Field

[0001] This invention relates to the field of electric heating technology, and in particular to a design method for an electric heating component and an electric heating appliance. Background Technology

[0002] Mica heating devices are widely used in household appliances. A typical mica heating device includes a metal frame, a mica heating plate housed within the metal frame, and heating wires wound around the mica heating plate. Insulating layers are present on both sides of the mica heating plate, and the heating wires are wound around both sides of the mica plate.

[0003] For example, CN 115022992 A discloses a heating plate, including an outer shell and a temperature controller. The temperature controller is snapped onto the inner wall of the outer shell. The temperature controller includes a connecting shell, a connecting ring, a temperature control spring, a pressure plate, and a fixing ring. The front surface of the outer shell is provided with a first insulating layer, the front surface of the first insulating layer is provided with a heating layer, the front surface of the heating layer is provided with an insulating layer, the front surface of the insulating layer is provided with a heat insulation layer, the front surface of the heat insulation layer is provided with a second insulating layer, and the front surface of the second insulating layer is provided with a base plate. The periphery of the outer shell is rolled inward and covers the periphery of the base plate. Both the heating layer and the heat insulation layer include annular mica sheets and heating wires, with the heating wires evenly wound around the surface of the mica sheets. After the device is powered on, the heating layer first heats the food inside. When the food is cooked and the internal temperature of the device reaches the preset threshold, the temperature control jump is triggered, thereby disconnecting the power. At this time, the insulation layer is used to keep the food warm, thus ensuring the temperature of the cooked food.

[0004] It is evident that two mica heating plates (a mica sheet and a heating wire wound around the mica sheet constitute a single mica heating plate) are required for heating and insulation, respectively. This results in a relatively thick plate, taking up more space, and increasing the total material cost for heating and insulation. Since the outer diameter of the mica sheet is mainly determined by the size of the outer shell, and the inner diameter of the mica sheet is determined by the size of the thermostat, the amount of heating wire wound is fixed due to the limited area of ​​the mica sheet. In other words, the power of a single mica heating plate is fixed and cannot be increased. If it is necessary to increase its power, multiple mica heating plates must be stacked in the thickness direction of the mica sheet. This would result in an even thicker plate, taking up more space, which undoubtedly increases the total material cost and is not conducive to heat transfer and effective utilization.

[0005] Therefore, a new technical solution needs to be researched to address the above problems. Summary of the Invention

[0006] In view of this, the present invention addresses the deficiencies of the prior art, and its main objective is to provide a design method for an electric heating component and an electric heating appliance. It combines multiple layers in a cascaded manner to form an electric heating component with the highest power, which is easy to control at different power levels and is particularly suitable for thin, flat, single-sided or double-sided heating scenarios.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A design method for an electric heating assembly, based on a given outer diameter, includes the following steps:

[0009] Step 1: Design N heating rings, where N is a natural number greater than 2;

[0010] Design the first heating ring; first design the first ring plate, with the given outer diameter as the outer diameter of the first ring plate, and half of the given outer diameter as the inner diameter of the first ring plate, and then continuously wind the first heating wire around the first ring plate along the circumference of the ring, with the first heating wire alternately passing through the inner ring side and the outer ring side of the first ring plate.

[0011] Design a second heating ring; first design a second ring plate, using the inner diameter of the first ring plate as the outer diameter of the second ring plate, and using half of the outer diameter of the second ring plate as the inner diameter of the second ring plate. Then, continuously wind a second heating wire around the second ring plate along the circumference of the ring, with the second heating wire alternately passing through the inner ring side and the outer ring side of the second ring plate.

[0012] Step 2: Place N heating rings sequentially into one electric heating component.

[0013] As a preferred option, when N is greater than 2, design the Xth heating ring: first design the Xth ring plate, where X is a natural number greater than 2, use the inner diameter of the (X-1)th ring plate as the outer diameter of the Xth ring plate, and use half of the outer diameter of the Xth ring plate as the inner diameter of the Xth ring plate. Then, continuously wind the Xth heating wire around the Xth ring plate along the circumference of the ring, with the Xth heating wire alternately passing through the inner ring side and the outer ring side of the Xth ring plate.

[0014] As a preferred embodiment, a circular heating plate is provided in the inner hole of the Nth heating ring, and the outer diameter of the circular heating plate is less than or equal to the inner diameter of the Nth heating ring.

[0015] As a preferred option, the N heating rings are connected in series or in parallel; or, the N heating rings are each independently connected to the control terminal so that they are heated separately.

[0016] As a preferred embodiment, N heating rings and circular heating plates are connected in series or in parallel; or, each of the N heating rings and circular heating plates is independently connected to the control terminal so that they can be heated independently.

[0017] As a preferred option, M outwardly expanding heating rings are also provided, where M is a natural number greater than or equal to 1. The design of the first outwardly expanding heating ring is as follows: first, design the N+1th ring plate, using the outer diameter of the first ring plate as the inner diameter of the N+1th ring plate, and the outer diameter of the N+1th ring plate is equal to twice the inner diameter of the N+1th ring plate. Then, the N+1th heating wire is continuously wound around the N+1th ring plate along the circumference of the ring.

[0018] As a preferred option, when M is a natural number greater than 2, the Xth expanding heating ring is designed as follows: First, design the N+Xth ring plate, where X is a natural number greater than 2. Use the outer diameter of the N+X-1th ring plate as the inner diameter of the N+Xth ring plate, and the outer diameter of the N+Xth ring plate is equal to twice the inner diameter of the N+Xth ring plate. Then, continuously wind the N+Xth heating wire along the circumference of the ring plate on the N+Xth ring plate.

[0019] As a preferred option, all N heating rings use heating wires that are continuously wound on one or both sides;

[0020] Alternatively, among the N heating rings, one or more heating rings use a single-sided continuous winding heating wire, while the remaining heating rings use a double-sided continuous winding heating wire.

[0021] An electric heating appliance includes a heating unit, the heating unit including an electric heating component, the electric heating component being manufactured using a design method for an electric heating component as described in any of the preceding claims.

[0022] As a preferred embodiment, the electric heating appliance is any one of an electric rice cooker, electric hot pot, grill, electric frying pan, noodle cooker, heater, electric water heater, or electric kettle.

[0023] Compared with existing technologies, this invention has significant advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it mainly combines multiple N heating rings that can be nested sequentially according to the area size (given outer diameter) to form the electric heating component with the highest power in a multi-layer cascade manner. It can also be connected in series or in parallel according to functional requirements, making it easy to control different power levels. It is especially suitable for thin, flat, single-sided or double-sided heating scenarios, effectively solving the problems of traditional technologies that can only stack multiple electric heating plates (such as mica heating plates) along the thickness direction under a fixed area, resulting in thicker thickness, larger space occupation, higher material costs, and unfavorable heat transfer and effective utilization.

[0024] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0025] Figure 1This is a step diagram illustrating a design method for an electric heating assembly according to an embodiment of the present invention;

[0026] Figure 2 This is a diagram illustrating the structural changes of the annular plate, the heated annular ring after winding the wire, and N heated annular rings sequentially nested into an electric heating assembly, as designed in an embodiment of the present invention.

[0027] Figure 3 This is a diagram illustrating the state of two heating rings sequentially nested within an electric heating assembly in an embodiment of the present invention (wherein, the ring plate is made of mica plate with no gaps on the inner and outer ring sides, and heating wires are continuously wound on both sides).

[0028] Figure 4 This is a diagram showing the state of three heating rings sequentially nested within an electric heating assembly in an embodiment of the present invention (wherein, the ring plate is made of mica plate with no gaps on the inner and outer ring sides, and heating wire is continuously wound on both sides).

[0029] Figure 5 This is an exploded view of four heating rings that can be sequentially nested into an electric heating assembly in an embodiment of the present invention (wherein, the ring plate is made of mica plate with no gaps on the inner and outer ring sides, and heating wires are continuously wound on both sides).

[0030] Figure 6 This is an exploded view of five heating rings that can be sequentially nested into an electric heating assembly according to an embodiment of the present invention (wherein, the ring plate is made of mica plate with no gaps on the inner and outer ring sides, and heating wires are continuously wound on both sides).

[0031] Figure 7 This is a diagram illustrating the state of two heating rings sequentially nested within an electric heating assembly in an embodiment of the present invention (wherein, the ring plate is a mica plate with notches on the inner and outer ring sides, with heating wires continuously wound on both sides).

[0032] Figure 8 This is a diagram showing the state of three heating rings sequentially nested within an electric heating assembly in an embodiment of the present invention (wherein, the ring plate is a mica plate with notches on the inner and outer ring sides, with heating wires continuously wound on both sides).

[0033] Figure 9 This is an exploded view of four heating rings that can be sequentially nested into an electric heating assembly in an embodiment of the present invention (wherein, the ring plate is made of mica plate with notches on the inner and outer ring sides, and heating wires are continuously wound on both sides).

[0034] Figure 10 This is an exploded view of five heating rings that can be sequentially nested into an electric heating assembly according to an embodiment of the present invention (wherein, the ring plate is a mica plate with notches on the inner and outer ring sides, and heating wires are continuously wound on both sides).

[0035] Figure 11 This is a diagram illustrating the state of two heating rings sequentially nested within an electric heating assembly in an embodiment of the present invention (wherein, the ring plate is a mica plate with notches on the inner and outer ring sides, with heating wire continuously wound on one side).

[0036] Figure 12 This is a diagram showing the state of three heating rings sequentially nested within an electric heating assembly in an embodiment of the present invention (wherein, the ring plate is a mica plate with notches on the inner and outer ring sides, with heating wire continuously wound on one side).

[0037] Figure 13 This is a schematic diagram showing the state of three heating rings and a circular heating plate sequentially nested within an electric heating assembly in an embodiment of the present invention;

[0038] Figure 14 This is a schematic diagram showing two heating rings and a circular heating plate sequentially nested together to form an electric heating assembly in an embodiment of the present invention.

[0039] Figure 15 This is a diagram illustrating the state of an electric heating assembly in an embodiment of the present invention, in which two heating rings and a circular heating plate are sequentially nested together (the circular heating plate is a circular mica plate with heating wires wound around it).

[0040] Figure 16 The diagram illustrates the outer and inner diameters of each ring plate, as well as the winding spacing and electrical connection endpoints of the heating wire, using two heating rings as an example.

[0041] Explanation of the reference numerals in the attached diagram: First heating ring 10, first ring plate 11, first heating wire 12, second heating ring 20, second ring plate 21, second heating wire 22, third heating ring 30, third ring plate 31, third heating wire 32, fourth heating ring 40, fifth heating ring 50, circular heating plate 60, circular mica plate 61, heating wire 62, notch 1, hanging tooth 2. Detailed Implementation

[0042] Please refer to Figures 1 to 16 As shown, it illustrates the specific structure of various embodiments of the present invention.

[0043] In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0044] like Figure 1 and Figure 2As shown, a design method for an electric heating assembly is presented. This design method is based on a given outer diameter, where the outer radius is defined as R, and the winding spacing n is generally also given. The method includes the following steps:

[0045] Step 1: Design N heating rings, where N is a natural number greater than 2; each heating ring includes a ring plate (the circular plate is usually made of insulating material, such as a ring-shaped mica plate) and heating wires continuously wound on one or both sides of the ring plate; the heating wires are wound at uniform intervals along the circumference until they cover the entire ring plate;

[0046] Design the first heating ring 10; first design the first ring plate 11 (which is the largest ring within the given outer diameter), using the given outer diameter as the outer diameter of the first ring plate 11, the outer diameter is 2R, and half of the given outer diameter is used as the inner diameter r of the first ring plate 11 (that is, r=R). Then, continuously wind the first heating wire 12 around the first ring plate 11 along the circumference of the ring. The first heating wire 12 alternately passes through the inner ring side and the outer ring side of the first ring plate 11. The spacing between adjacent winding segments on the same side of the first heating wire 12 is the winding spacing, which is usually given as needed.

[0047] Design a second heating ring 20; first design a second ring plate 21, using the inner diameter r of the first ring plate 11 as the outer diameter (i.e., R) of the second ring plate 21, and using half of the outer diameter of the second ring plate 21 as the inner diameter (i.e., 0.5R). Then, continuously wind a second heating wire 22 around the second ring plate 21 along the circumference of the ring. The second heating wire 22 alternately passes through the inner ring side and the outer ring side of the second ring plate 21. The spacing between adjacent winding segments on the same side of the second heating wire 22 is the winding spacing, which is usually given as needed.

[0048] In step 1, when making each annular plate, it is usually cut from a plate (such as a mica plate). After cutting, the outer diameter of the second annular plate may be slightly smaller than the inner diameter of the first annular plate. This is just a small dimensional deviation caused by processing, and it should still be understood that the outer diameter of the second annular plate is equal to the inner diameter of the first annular plate.

[0049] Step 2: Place N heating rings sequentially into a complete electric heating assembly, wherein the first heating ring 10 is placed around the outer periphery of the second heating ring 20.

[0050] Since each heating ring has the highest power, the electric heating components arranged in this way, when connected in series, will inevitably have the longest total heating wire length and the highest power compared to a single heating ring of the same area. Thus, a multi-layered cascaded electric heating component with the highest power is obtained.

[0051] Combination Figure 16Given the outer diameter and winding spacing n, i.e., the radius of the circle is R, let the center of the circle be point O, take any point X on the radius R, and let the length of OX be r. Draw a circle with point O as the center and r as the radius; the winding spacing n = the diameter of the heating wire + the gap between adjacent heating wires. If the heating wire is continuously wound on one side or on both sides of a ring with a width of Rr, it can be known that the number of turns of the heating wire on the ring is 2πr / n.

[0052] When the heating wire is continuously wound on one side of the ring, the total length of the winding Z1 = (Rr)2πr / n. Since R, π, and n are known values, and r is the unknown, it forms a quadratic function. For the general form of a quadratic function y = ax² + bx + c, when a < 0, the parabola opens downwards, and the function y has a maximum value of (4ac - b²) / 4a. The vertex coordinates are [-b / 2a, (4ac - b²) / 4a]. Solving for r, we find that Z1 has a maximum value when r = R / 2. Therefore, when the inner radius of the ring is half of its outer radius, the total length of the winding Z1 of the heating wire continuously wound on one side of the ring has a maximum value.

[0053] When the heating wire is continuously wound on both sides of the ring, the total length of the winding Z2 = 2(Rr)2πr / n. Since R, π, and n are known values, and r is the unknown, it forms a quadratic function. For the general form of a quadratic function y = ax² + bx + c, when a < 0, the parabola opens downwards, and the function y has a maximum value of (4ac - b²) / 4a. The vertex coordinates are [-b / 2a, (4ac - b²) / 4a]. Solving for r, we find that Z1 has a maximum value when r = R / 2. Therefore, when the inner radius of the ring is half of its outer radius, the total length of the winding Z2 of the heating wire continuously wound on one side of the ring has a maximum value.

[0054] Therefore, the first heating ring 10 with the greatest power can be obtained.

[0055] Continue designing the second heating ring 20. Take a point F on the remaining circle with radius r, and draw a circle with point O as the center and the length of line segment OF as the radius. Similarly, when OF=r / 2, the total winding length of the heating wire of the second heating ring 20 has a maximum value.

[0056] Thus, for an electric heating assembly consisting of N heating rings nested together, the total winding length of the heating wire of a single heating ring has reached its maximum value, which means the power is at its maximum. Therefore, the power of the electric heating assembly can also be maximized.

[0057] like Figure 4-6 ,as well as Figure 8-10As shown, the electric heating assembly is formed by nesting three or more heating rings in sequence. When N is greater than 2, the design of the Xth heating ring is as follows: First, design the Xth ring plate, where X is a natural number greater than 2. Use the inner diameter of the (X-1)th ring plate as the outer diameter of the Xth ring plate, and use half of the outer diameter of the Xth ring plate as the inner diameter of the Xth ring plate. Then, continuously wind the Xth heating wire around the Xth ring plate along the circumference of the ring. The Xth heating wire alternately passes through the inner and outer ring sides of the Xth ring plate. The spacing between adjacent winding segments on the same side of the Xth heating wire is the winding spacing, which is usually given as needed. Taking the design of the third heating ring 30 as an example: First, design the third ring plate 31, using the inner diameter r of the second ring plate 21 as the outer diameter of the third ring plate 31 (i.e., 0.5R). The inner diameter of the third ring plate 31 is equal to half of the outer diameter of the third ring plate 31 (i.e., 0.25R). In some cases, it is also acceptable if the inner diameter of the third ring plate 31 is designed to be slightly larger than 0.25R or slightly smaller than 0.25R. Then, continuously wind the third heating wire 32 around the third ring plate 31 along the circumference of the ring. The third heating wire 32 alternately passes through the inner ring side and the outer ring side of the third ring plate 31. The spacing between adjacent winding segments on the same side of the third heating wire 32 is the winding spacing, which is usually given as needed.

[0058] like Figure 13-15 As shown, a circular heating plate 60 is disposed in the inner hole of the Nth heating ring, and the outer diameter of the circular heating plate 60 is less than or equal to the inner diameter of the Nth heating ring. By using a circular electric heating plate instead of a ring-shaped one for the innermost layer, taking an electric frying pan as an example, the innermost circular heating plate 60 has the smallest area and correspondingly lower power, serving to maintain the temperature. In actual design, the circular heating plate 60 can be a metal heating plate or a circular heating plate 60 formed by winding heating wires 62 on a circular mica plate 61.

[0059] Since the electric heating element is composed of N heating rings nested together, a multi-layer cascaded configuration can be used to create the most powerful electric heating element. Furthermore, different power levels can be easily controlled according to functional requirements. When electrically connecting and controlling each heating ring, the N heating rings can be connected in series or parallel, or each of the N heating rings can be independently connected to the control terminal for individual heating control. Figure 16For example, if terminals A and B are connected to the input voltage, and terminals B and C are connected to terminals A and B respectively, it's equivalent to the heating wires of two heating rings being connected in parallel. If terminals B and C are short-circuited, and terminals A and D are connected to the input voltage, then the heating wires of the two heating rings are connected in series. Similarly, N heating rings and circular heating plates can be connected in series or in parallel; or, N heating rings and circular heating plates can be independently connected to the control terminal for individual heating control. Series connection allows for combinations of power requirements from small to large; adjusting the power level means adjusting the number of heating units (heating rings or circular heating plates) to enter the working state. Parallel connection allows for individual control of each heating unit. Thus, these multi-layered cascaded heating units can be combined in series or in parallel to meet different functional requirements.

[0060] In practical design, all N heating rings use single-sided or double-sided continuously wound heating wires. Single-sided wound electric heating components are suitable for single-sided heating scenarios, which can concentrate on single-sided heating and reduce heat loss. If the winding spacing n of the heating wire is fixed, for mica boards of the same shape and size, the length of the heating wire with single-sided winding is half that with double-sided winding, and the power will also be reduced by half. On the other hand, double-sided wound electric heating components are suitable for double-sided heating scenarios, which can heat both sides at the same time, and the power is also twice that of single-sided wound electric heating components. Alternatively, among the N heating rings, more than one heating ring uses single-sided continuously wound heating wire, while the remaining heating rings use double-sided continuously wound heating wire to meet the differentiated and diversified application scenarios of double-sided heating capabilities. Furthermore, the heating wire designs of the N heating rings can be the same or different. For example, the heating wire materials, diameters, and winding spacing can be different. The ring plate is generally made of mica plate. Of course, it is also possible to use other materials to completely or partially replace it. It mainly serves as a winding carrier to facilitate winding, and its heat resistance must be considered.

[0061] Specifically, such as Figures 3 to 12 As shown, it illustrates several implementation scenarios:

[0062] like Figure 3 As shown, it uses two heating rings (i.e., the first heating ring 10 and the second heating ring 20) nested together to form an electric heating component. The ring plate is made of mica plate with no notches on the inner and outer ring sides, and the heating wire is continuously wound on both sides. Since the heating wire is wound and wrapped around the inner and outer ring sides of the ring plate, it will occupy a small amount of space. Therefore, the inner and outer diameters of the cut ring plate need to take into account dimensional deviations and leave a margin. For mica plates with no notches on the inner and outer ring sides, it is usually only suitable for continuous winding heating on both sides. If it is necessary to achieve continuous winding of heating wire on one side, several hanging protrusions can be set on the inner and outer ring sides of one side of the mica plate to provide hanging points on the inner and outer ring sides during heating and winding. In this way, the heating wire can be wound sequentially on one side.

[0063] like Figure 4-6 As shown, it uses 3-5 heating rings nested in sequence to form an electric heating component. The ring plate is made of mica plate with no gaps on the inner and outer ring sides, and heating wires are continuously wound on both sides. Figure 4 The electric heating component includes a first heating ring 10, a second heating ring 20, and a third heating ring 30. Figure 5 The electric heating component includes a first heating ring 10, a second heating ring 20, a third heating ring 30, and a fourth heating ring 40. Figure 6 The electric heating component includes a first heating ring 10, a second heating ring 20, a third heating ring 30, a fourth heating ring 40, and a fifth heating ring 50.

[0064] like Figure 7 As shown, it uses two heating rings (i.e., the first heating ring 10 and the second heating ring 20) nested in sequence to form an electric heating component. The ring plate is a mica plate with notches on the inner and outer ring sides, and heating wires are continuously wound on both sides. The notches on the inner and outer ring sides allow the heating wires to pass through and be wound to the other side of the mica plate. Due to the setting of the notches, the heating wires are usually hidden in the area between the inner and outer ring sides of the ring plate, and will not protrude and occupy additional area outside the ring plate.

[0065] like Figure 8-10 As shown, it uses 3-5 heating rings nested in sequence to form an electric heating component. The ring plate is a mica plate with notches 1 on the inner and outer ring sides, and heating wires are continuously wound on both sides. Figure 8 The electric heating component includes a first heating ring 10, a second heating ring 20, and a third heating ring 30. Figure 9 The electric heating component includes a first heating ring 10, a second heating ring 20, a third heating ring 30, and a fourth heating ring 40. Figure 10 The electric heating component includes a first heating ring 10, a second heating ring 20, a third heating ring 30, a fourth heating ring 40, and a fifth heating ring 50.

[0066] like Figure 11-12 As shown, it uses 2-3 heating rings nested together to form an electric heating component. Figure 11 The electric heating component includes a first heating ring 10 and a second heating ring 20. Figure 12The electric heating component includes a first heating ring 10, a second heating ring 20, and a third heating ring 30. Each ring plate is a mica plate with notches 1 on the inner and outer ring sides, and a heating wire is continuously wound on one side. There are hanging teeth 2 between two adjacent notches 1 on the inner and outer ring sides. When winding the heating wire, the heating wire passes through a notch 1 on one side of the mica plate and winds to the other side of the hanging teeth 2, and then returns to one side of the mica plate from the adjacent notch 1. Similarly, due to the setting of the notch 1, the heating wire will not protrude and occupy additional area outside the ring plate.

[0067] If the heating plate area needs to be increased, M outward-expanding heating rings can be set, where M is a natural number greater than 1. The design of the first outward-expanding heating ring is as follows: First, design the N+1th ring plate, using the outer diameter of the first ring plate 11 as the inner diameter of the N+1th ring plate, and the outer diameter of the N+1th ring plate is equal to twice the inner diameter of the N+1th ring plate. Then, continuously wind the N+1th heating wire around the N+1th ring plate along the circumference of the ring. The N+1th heating wire alternately passes through the inner ring side and the outer ring side of the N+1th ring plate. The spacing between adjacent winding segments on the same side of the N+1th heating wire is the winding spacing, which is usually given as needed. When M is a natural number greater than 2, design the Xth expanding heating ring: First, design the (N+X)th ring plate, where X is a natural number greater than 2. Use the outer diameter of the (N+X-1)th ring plate as the inner diameter of the (N+X)th ring plate, and the outer diameter of the (N+X)th ring plate is twice its inner diameter. Then, continuously wind the (N+X)th heating wire around the (N+X)th ring plate circumferentially. The (N+X)th heating wire alternately passes through the inner and outer ring sides of the (N+X)th ring plate. The spacing between adjacent winding segments on the same side of the (N+X)th heating wire is the winding spacing, which is usually given as needed. By layering these elements, an electric heating component with an area that can be customized in terms of outer diameter can be obtained.

[0068] The descriptions of the corresponding annular plates, heating wire winding methods, and other aspects in the above-described embodiments are not intended to limit the combination of technical features in specific implementable situations. The technical features of different embodiments can be replaced or slightly modified as needed to create more other embodiments that meet actual needs.

[0069] Furthermore, an electric heating appliance is provided, comprising a heating unit, wherein the heating unit includes an electric heating component. Typically, a metal plate (such as an aluminum plate or an aluminum alloy plate, which has excellent thermal conductivity, serving to conduct and even out heat) is covered on one or both sides of the electric heating component. The electric heating component is manufactured using a design method described in any of the preceding claims. The electric heating appliance is any one of an electric rice cooker, electric hot pot, grill, electric frying pan, heater, electric water heater, or electric kettle.

[0070] Some electric heating appliances require a central through-hole in their heating unit (also called a heating plate) for installing a temperature control switch. For example, some rice cookers have a temperature control switch installed in the center of their heating plate. When the inner pot is placed inside, the bottom of the inner pot contacts the heating plate and presses against the temperature control switch, triggering the switch. This is suitable for multiple heating rings nested together to form a complete electric heating assembly. Other electric heating appliances do not require a central through-hole and can be used with multiple heating rings nested together to form a complete electric heating assembly, or with a circular heating plate installed in the inner hole of the Nth heating ring.

[0071] The key design feature of this invention is that, based on the area size (given outer diameter), it designs multiple N heating rings that can be nested sequentially, and combines them in a multi-layer cascade manner to create an electric heating component with the highest power. It can also be connected in series or in parallel according to functional requirements, making it easy to control different power levels. It is especially suitable for thin, flat, single-sided or double-sided heating scenarios, effectively solving the problems of traditional technologies that can only stack multiple electric heating plates (such as mica heating plates) along the thickness direction under a fixed area, resulting in thicker thickness, larger space occupation, higher material costs, and unfavorable heat transfer and effective utilization.

[0072] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A design method for an electric heating assembly, characterized in that: This design method, based on a given outer diameter, includes the following steps: Step 1: Design N heating rings and one circular heating plate, where N is a natural number greater than 2; The design of the heating ring is based on the mathematical model: Z2 = 2(Rr)2πr / n; where R is the radius of the circle, which is half of the given outer diameter. Let the center of the circle be point O, and take any point X on the radius R. Let the length of OX be r. Draw a circle with point O as the center and r as the radius. The winding spacing n = the diameter of the heating wire + the gap between adjacent heating wires. The heating wire is continuously wound on both sides of the ring with a width of Rr. The number of turns of the heating wire on the heating ring is 2πr / n. Z2 is the total winding length of the heating wire. Since R, π, and n are known values, and the unknown is r, they form a quadratic function. When r = R / 2, Z2 reaches its maximum value. The conclusion is that when the inner diameter of the heating ring is half of its outer diameter, the total winding length Z2 of the heating wire continuously wound on both sides of the heating ring is at its maximum value. Based on the above conclusions, the first heating ring to the Nth heating ring are designed sequentially: Design the first heating ring; first design the first ring plate, with the given outer diameter as the outer diameter of the first ring plate, and half of the given outer diameter as the inner diameter of the first ring plate, and then continuously wind the first heating wire around the first ring plate along the circumference of the ring, with the first heating wire alternately passing through the inner ring side and the outer ring side of the first ring plate. Design a second heating ring; first design a second ring plate, using the inner diameter of the first ring plate as the outer diameter of the second ring plate, and using half of the outer diameter of the second ring plate as the inner diameter of the second ring plate. Then, continuously wind a second heating wire around the second ring plate along the circumference of the ring, with the second heating wire alternately passing through the inner ring side and the outer ring side of the second ring plate. If N is greater than 2, continue designing the Xth heating ring in sequence: first design the Xth ring plate, where X is a natural number greater than 2, use the inner diameter of the (X-1)th ring plate as the outer diameter of the Xth ring plate, and use half of the outer diameter of the Xth ring plate as the inner diameter of the Xth ring plate. Then, continuously wind the Xth heating wire around the Xth ring plate along the circumference of the ring, with the Xth heating wire alternately passing through the inner ring side and the outer ring side of the Xth ring plate. Among them, N heating rings are all made of mica plates with notches evenly distributed on the inner and outer ring sides. The notches allow the corresponding heating wires to pass through and be wound to the other side of the mica plate, so that the heating wires are hidden in the area between the inner and outer ring sides of the corresponding ring plate, realizing the continuous winding of heating wires on both sides. In addition, a circular heating plate is designed, wherein the outer diameter of the circular heating plate is less than or equal to the inner diameter of the Nth heating ring, and the circular heating plate is a metal heating plate; Step 2: Place N heating rings sequentially into an electric heating assembly, and place a circular heating plate in the inner hole of the Nth heating ring. The circular heating plate is used for heat preservation.

2. The design method of an electric heating assembly according to claim 1, characterized in that: N heating rings and circular heating plates are connected in series or in parallel; or, each of the N heating rings and circular heating plates is independently connected to the control terminal so that they can be heated independently.

3. The design method of an electric heating assembly according to claim 1, characterized in that: It also has M outward-expanding heating rings, where M is a natural number greater than 1; the design of the first outward-expanding heating ring is as follows: first design the N+1th ring plate, using the outer diameter of the first ring plate as the inner diameter of the N+1th ring plate, and the outer diameter of the N+1th ring plate is equal to twice the inner diameter of the N+1th ring plate, and then continuously wind the N+1th heating wire around the N+1th ring plate along the circumference of the ring.

4. The design method of an electric heating assembly according to claim 3, characterized in that: When M is a natural number greater than 2, design the Xth outward-expanding heating ring: first design the N+Xth ring plate, where X is a natural number greater than 2, and use the outer diameter of the N+X-1th ring plate as the inner diameter of the N+Xth ring plate, and the outer diameter of the N+Xth ring plate is equal to twice the inner diameter of the N+Xth ring plate. Then, continuously wind the N+Xth heating wire along the circumference of the ring plate on the N+Xth ring plate.

5. An electric heating appliance comprising a heating unit, characterized in that: The heating unit includes an electric heating component, which is manufactured using the design method of an electric heating component according to any one of claims 1 to 4.

6. The electric heating appliance according to claim 5, characterized in that: The electric heating appliance is any one of the following: rice cooker, electric hot pot, grill, electric frying pan, noodle cooker, heater, electric water heater, and electric kettle.

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