Inner and outer ring unequal thickness coil disc

Abstract

The utility model discloses an inner and outer ring unequal thick type coil panel, including inner ring coil and outer ring coil, inner ring coil and outer ring coil are all dense -wound single -layer coil, and inner ring coil is located at the inboard of outer ring coil, and the empty wire ring area is formed between inner ring coil and outer ring coil, and inner ring coil and outer ring coil are integrally connected, and the thickness of inner ring coil and outer ring coil is different. The inner and outer ring unequal thick type coil panel of the utility model is favorable for reducing the hard open voltage of IGBT, is favorable for making induction cooker convenient debugging, and heating homogeneity is better.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic heating coils, specifically to a coil with unequal thickness of inner and outer rings. Background Technology

[0002] Currently, electromagnetic heating coils are generally divided into two main categories based on their structural characteristics: one is a loosely wound coil with the wires wound alternately, and the other is a tightly wound coil with the wires wound close together. When the power of electromagnetic heating coils on the market is between 2500W and 3500W, the outer diameter of the coil is typically between 250mm and 280mm.

[0003] For a given power and diameter, the winding method of a loosely wound coil typically involves an inner single-layer coil combined with an outer double-layer coil. The lower coil of both the inner single-layer and outer double-layer coils is farther from the bottom of the pot, while the upper coil of the outer double-layer coil is closer to the pot. This combination of proximity to the pot results in a lower break-in voltage for the coil, making it easier to adjust the induction cooker functions. However, its thermal efficiency is not as high as that of a tightly wound coil. Loosely wound coils must be wound within the positioning groove of a plastic tray holder.

[0004] With a fixed outer diameter, a closely wound coil results in a relatively large distance between the inner and outer rings, leading to a large annular empty wire area between them. This results in poor heating performance of the inner ring coil. Furthermore, the consistent distance between each coil and the bottom of the cookware causes a high IGBT break-in voltage, making the induction cooker difficult to adjust. Placing the entire closely wound coil away from the bottom of the cookware further reduces efficiency. If the outer ring coil is designed as a double-layer stacked structure while the inner ring coil remains a single layer, the difficulty in connecting the two layers with adhesive during winding creates a problem in maintaining the shape and structure of the outer ring coil. In other words, if the closely wound coil is not properly secured, problems such as unraveling and bulging may occur. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a coil disc with unequal thickness of inner and outer rings, which is beneficial for reducing the hard-open voltage of IGBTs, making the induction cooker easier to adjust, and providing better heating uniformity.

[0006] The objective of this utility model is achieved through the following technical solution.

[0007] The present invention discloses a coil disk with unequal thickness of inner and outer rings, comprising an inner ring coil and an outer ring coil. Both the inner ring coil and the outer ring coil are tightly wound single-layer coils. The inner ring coil is located inside the outer ring coil. An empty loop area is formed between the inner ring coil and the outer ring coil. The inner ring coil and the outer ring coil are integrally connected. The inner ring coil and the outer ring coil have different thicknesses.

[0008] Preferably, the inner loop coil and / or the outer loop coil are flat wire coils.

[0009] Preferably, the thickness of the inner loop coil is less than the thickness of the outer loop coil.

[0010] Preferably, the thickness of the inner loop coil is greater than the thickness of the outer loop coil.

[0011] Preferably, both the inner and outer loop coils are circular coils.

[0012] Preferably, both the inner and outer loop coils are rectangular coils.

[0013] Preferably, the inner loop coil is a circular coil, and the outer loop coil is a rectangular coil.

[0014] Compared with the prior art, the advantages of this utility model are: by setting the inner ring coil and the outer ring coil to be connected as a whole, and setting the inner ring coil and the outer ring coil to have different thicknesses, it is beneficial to reduce the hard-open voltage of the IGBT and to make the induction cooker easier to adjust. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the combination of an inner and outer ring coil disk with unequal thickness and a mica sheet, which is the first embodiment of this utility model.

[0016] Figure 2 This is a cross-sectional view of the combination of an inner and outer ring coil disk with unequal thickness and a mica sheet according to the first embodiment of this utility model.

[0017] Figure 3 for Figure 2 A partial structural diagram at point A.

[0018] Figure 4 This is a cross-sectional view of the combination of an inner and outer ring coil disk with unequal thickness and a mica sheet, according to the second embodiment of this utility model.

[0019] Figure 5 This is a top view schematic diagram of the combination of an inner and outer ring unequal thickness coil disk and a mica sheet in the third embodiment of this utility model.

[0020] Figure 6This is a top view of the fourth embodiment of the present invention, showing the combination of an inner and outer ring coil disk with unequal thickness and a mica sheet.

[0021] Figure 7 This is a schematic diagram illustrating the process of winding the coil disk according to the first embodiment of this utility model.

[0022] Figure 8 This is a schematic diagram illustrating the process of winding the coil disk according to the second embodiment of this utility model.

[0023] Labeling explanation: Inner ring coil 11; Outer ring coil 12; Jumper wire 13; Empty wire ring area 101; Mica sheet 2; Winding support plate 99; Inner ring clamp 98; Outer ring clamp 97; Wire pressing plate 96. Detailed Implementation

[0024] The present invention will now be further described with reference to the accompanying drawings.

[0025] The coil disc of this utility model with unequal thickness of inner and outer rings, such as Figures 1 to 3 As shown, the device includes an inner loop coil 11 and an outer loop coil 12. Both the inner loop coil 11 and the outer loop coil 12 are closely wound single-layer coils, meaning that the multi-strand enameled wire of the inner loop coil 11 is wound tightly together. The inner loop coil 11 is a single-layer coil located inside the outer loop coil 12, forming a loose loop area 101 between them. The inner loop coil 11 and the outer loop coil 12 are integrally connected, meaning they are made from the same multi-strand enameled wire. Specifically, the inner loop coil 11 and the outer loop coil 12 are connected via a jumper wire 13. Therefore, the jumper wire 13, the inner loop coil 11, and the outer loop coil 12 all use the same multi-strand enameled wire. Figure 2 and Figure 3 As shown, the inner loop coil 11 and the outer loop coil 12 have different thicknesses, that is, the thickness dimension "H" of the inner loop coil 11 is different from the thickness dimension "W" of the outer loop coil 12.

[0026] Since both the inner loop coil 11 and the outer loop coil 12 are closely wound single-layer coils, the problem of difficulty in fixing the shape of double-layer closely wound coils is avoided. Figure 1 As shown, the inner loop coil 11 and the outer loop coil 12 can be bonded to the mica sheet 2. Since the inner loop coil 11 and the outer loop coil 12 are made from the same multi-strand enameled wire, the problem of mutual interference between the two independent coils is avoided by preventing them from being separate coils. Because the inner loop coil 11 and the outer loop coil 12 have different thicknesses, as shown... Figure 2 and Figure 3As shown, this allows the distance from the inner coil 11 to the bottom of the pot to be different from the distance from the outer coil 12 to the bottom of the pot. This helps reduce the hard-open voltage of the IGBT and makes the induction cooker easier to adjust. Figure 3 As can be seen, the mica sheet 2 has a flat disc structure. The lower ends of the inner ring coil 11 and the outer ring coil 12 are both attached to the top of the mica sheet 2. The microcrystalline plate of the induction cooker is located above the coil disc. Currently, the diameter of the multi-strand enameled wire in the induction cookers on the market is approximately 2mm to 6mm. Specifically, the difference between the thickness dimension "H" of the inner ring coil 11 and the thickness dimension "W" of the outer ring coil 12 is greater than or equal to 0.5mm.

[0027] Furthermore, the inner loop coil 11 and / or the outer loop coil 12 are configured as flat wire coils, meaning that the aforementioned multi-strand enameled wire can be flattened into an approximately elliptical cross-section. Specifically, the first combination is: the inner loop coil 11 is a circular cross-section coil, while the outer loop coil 12 is a flat wire coil (the major axis of the ellipse is vertically set); the second combination is: the outer loop coil 12 is a circular cross-section coil, while the inner loop coil 11 is a flat wire coil (the major axis of the ellipse is vertically set); the third combination is: the inner loop coil 11 is a flat wire coil (the minor axis of the ellipse is vertically set), and the outer loop coil 12 is a flat wire coil (the major axis of the ellipse is vertically set), so that the inner loop coil 11 and the outer loop coil 12 have different thicknesses. Since the multi-strand enameled wire of the inner loop coil 11 is vertically flattened, the inner loop... With a certain number of turns and inner diameter, the inner coil 11 has a larger outer diameter, thus expanding its heating range. When the inner diameter of the outer coil 12 is fixed, the area of ​​the empty wire loop region 101 can be reduced, which is beneficial for achieving better heating uniformity of the coil disk in this embodiment. The fourth combination is: the inner coil 11 is a flat wire coil (elliptical with its major axis vertically positioned), and the outer coil 12 is a flat wire coil (elliptical with its minor axis vertically positioned). With a fixed outer diameter of the coil disk and a fixed number of turns for the outer coil 12, the cross-sectional shape of the multi-strand enameled wire of the outer coil 12 is an ellipse with its minor axis vertically positioned, which helps to reduce the inner diameter of the outer coil 12 and relatively reduce the empty wire loop region 101. By flattening the multi-strand enameled wire horizontally or vertically, it is simple and cost-effective to achieve different thicknesses for the inner coil 11 and the outer coil 12.

[0028] In some embodiments, such as Figure 2 and Figure 3 As shown, the thickness of the inner loop coil 11 is less than the thickness of the outer loop coil 12, that is to say Figure 3Since the dimension "H" is smaller than the dimension "W", the multi-strand enameled wire of the outer ring coil 12 can be horizontally flattened (the major axis of the ellipse is vertically set), while the multi-strand enameled wire of the inner ring coil 11 is set with an approximately circular cross-section. In this embodiment, by making the multi-strand enameled wire of the outer ring coil 12 horizontally flattened, the multi-strand enameled wire of the inner ring coil 11 can be prevented from being horizontally flattened, thus avoiding a significant reduction in the outer diameter of the inner ring coil 11 and a significant expansion of the empty wire loop area 101.

[0029] In some embodiments, such as Figure 4 As shown, the thickness of the inner ring coil 11 is greater than that of the outer ring coil 12. When the lower end of the inner ring coil 11 is aligned with the lower end of the outer ring coil 12 and abuts against the upper side of the mica sheet 2, the upper end of the inner ring coil 11 is closer to the bottom of the pot, which is beneficial to relatively enhance the heating effect of the middle part of the bottom of the pot. In this embodiment, under the premise that the total number of turns of the inner and outer ring coils with unequal thickness is fixed, the inner ring coil 11 is distributed with a relatively larger number of turns, which can also make the inner ring coil 11 have a larger outer diameter.

[0030] In some embodiments, such as Figure 1 As shown, both the inner coil 11 and the outer coil 12 are circular coils. That is to say, from a top-down view, both the inner coil 11 and the outer coil 12 are circular, thus forming a circular heating range. Most cookware on the market is circular, so it is more compatible with cookware on the market.

[0031] In some embodiments, such as Figure 5 As shown, both the inner ring coil 11 and the outer ring coil 12 are rectangular coils, thus giving the coil disc with unequal thickness of inner and outer rings a rectangular heating range, which is well adapted to some rectangular cookware.

[0032] In some embodiments, such as Figure 6 As shown, the inner loop coil 11 is a circular coil and the outer loop coil 12 is a rectangular coil. Since the multi-strand enameled wire of the inner loop coil 11 is not easy to bend at right angles, but the area occupied by the inner loop coil 11 is small, the inner loop coil 11 is made into a circular coil, which makes it easier to wind the inner loop coil 11.

[0033] like Figure 7As shown, corresponding to the first embodiment of this utility model, during the winding process, the inner ring coil 11 is first wound around the outside of the mandrel. The inner ring coil 11 is located between the winding support plate 99 and the inner ring clamp 98. During this process, the outer end of the pressure plate 96 applies a radial thrust towards the mandrel to the outer periphery of the inner ring coil 11, causing the multiple strands of enameled wire of the inner ring coil 11 to be wound tightly together. After the inner ring coil 11 is wound, the pressure plate 96 moves outward, moving the support ring (note that the above-mentioned "support ring" is not shown in any of the figures) to the inner ring coil 11. On the outside, lower the height of the outer ring clamp 97, and then continue winding the outer ring coil 12. That is, the outer ring coil 12 is wound on the outside of the aforementioned support ring. Since the distance between the outer ring clamp 97 and the winding support plate 99 has increased, under the pushing force of the pressure plate 96, the multiple strands of enameled wire of the outer ring coil 12 are flattened horizontally into an ellipse with the elongated axis vertical. Then, remove the winding support plate 99, apply silicone sealant to the mica sheet 2, and invert the mica sheet 2 onto the coil disc. The coil disc can then be shaped and removed. Finally, flip the mica sheet 2 upside down to form... Figure 2 The structure shown. Similarly, as Figure 8 As shown, in the second embodiment of this utility model, the winding support plate 99 and the inner ring clamp 98 are first made to have a large gap. When winding the inner ring coil 11, the pressure plate 96 can flatten the multiple strands of enameled wire of the inner ring coil 11 horizontally into an ellipse with the long axis upright. After the inner ring coil 11 is wound, the outer ring clamp 97 is raised so that the upper position of the outer ring clamp 97 is higher than the upper position of the inner ring clamp 98. Thus, when winding the outer ring coil 12, under the squeezing action of the outer ring clamp 97 and the winding support plate 99, even if the pressure plate 96 applies radial force to the outer periphery of the outer ring coil 12, the multiple strands of enameled wire of the outer ring coil 12 are also flattened vertically into an ellipse with the short axis upright.

[0034] In summary, the unequal thickness inner and outer ring coil of this utility model, under the condition of the same wire (multi-strand enameled wire), inductance or number of turns, can increase the heating area of ​​the inner ring coil, making the heating more uniform and improving the accuracy of pot detection. Moreover, the different distances between the inner and outer ring coils and the pot can reduce the hard-open voltage of the IGBT.

Claims

1. A coil disk with unequal thickness of inner and outer rings, comprising an inner ring coil (11) and an outer ring coil (12), wherein both the inner ring coil (11) and the outer ring coil (12) are closely wound single-layer coils, and the inner ring coil (11) is disposed inside the outer ring coil (12), characterized in that: An empty loop area (101) is formed between the inner loop coil (11) and the outer loop coil (12). The inner loop coil (11) and the outer loop coil (12) are integrally connected, and the inner loop coil (11) and the outer loop coil (12) have different thicknesses.

2. The coil disk with unequal thickness of inner and outer rings according to claim 1, characterized in that: The inner loop coil (11) and / or the outer loop coil (12) are configured as flat wire coils.

3. The coil disk with unequal thickness of inner and outer rings according to claim 2, characterized in that: The thickness of the inner ring coil (11) is less than the thickness of the outer ring coil (12).

4. The coil disk with unequal thickness of inner and outer rings according to claim 2, characterized in that: The thickness of the inner ring coil (11) is greater than the thickness of the outer ring coil (12).

5. The coil disk with unequal thickness of inner and outer rings according to claim 2, 3, or 4, characterized in that: Both the inner ring coil (11) and the outer ring coil (12) are circular coils.

6. The coil disk with unequal thickness of inner and outer rings according to claim 2, 3, or 4, characterized in that: Both the inner loop coil (11) and the outer loop coil (12) are rectangular coils.

7. The coil disk with unequal thickness of inner and outer rings according to claim 2, 3, or 4, characterized in that: The inner loop coil (11) is a circular coil, and the outer loop coil (12) is a rectangular coil.

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