Uniform heating low-inductance coil structure

Abstract

The utility model discloses a uniform heating low inductance coil structure, which comprises a wire group, the wire group is wound to form a coil body, the wire group comprises at least two leads, the leads are arranged along the progressive direction of the wire group, the leads of the wire group are arranged in parallel, and the leads in the range of the coil body are arranged at equal intervals. The low-inductance coil structure capable of uniformly heating is beneficial to improving the heating uniformity of the coil body during working.

Description

Technical Field

[0001] The utility model relates to the field of electromagnetic heating coils, in particular to a low-inductance coil structure with uniform heating. Background Art

[0002] At present, the existing induction cookers can be divided into the following categories according to their power: low-power induction cookers (below 1000W), common-power induction cookers (1200W-2500W) and high-power induction cookers (3KW-35KW). Due to the different power sizes, the winding methods of the coil bodies of the induction cookers are different, and the advantages and disadvantages they exhibit are also different. For low-power induction cookers, the winding method is mostly three-layer or more. When working, the heating is more uniform, but there are disadvantages such as small heating area and overly concentrated heating. For common-power induction cookers, the coil bodies are mostly wound in two layers or partially in two layers. When working, the heating area is moderate, but the heating uniformity is poor. For high-power induction cookers, since the inductance value of the coil body of a high-power induction cooker needs to be set relatively low, the number of turns of the coil body is relatively small, and a single-layer winding method is used. Since the bottom area of ​​the pots used in high-power induction cookers is also relatively large, in order to avoid concentrated heating only in the middle of the pot, such as Figure 8 and Figure 9 As shown, the only way is to wind the wire in the middle, then form an empty wire area 990 in the middle, and then wind the wire around the outside. Figure 8 When the coil body shown is working, although the heating area is large, the heating uniformity is very poor due to the wide dead line area 990, so the existing low inductance coil structure needs to be improved. Summary of the Invention

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a low inductance coil structure, which is conducive to improving heating uniformity.

[0004] The purpose of this utility model is achieved through the following technical solutions.

[0005] The utility model discloses a low-inductance coil structure with uniform heating, comprising a wire group, wherein the wire group is wound to form a coil body, the wire group comprises at least two conducting wires, the arrangement direction of the conducting wires is along the progressive direction of the wire group, and the conducting wires of the wire group are arranged in parallel.

[0006] Preferably, the conductive wires within the coil body are arranged at equal intervals.

[0007] Preferably, the coil body is formed with an empty wire loop area.

[0008] Preferably, the coil body is in the shape of a flat disk.

[0009] Preferably, the coil body is cylindrical.

[0010] Preferably, the coil body is in an arc bowl shape.

[0011] Preferably, the coil body is wound in concentric circles.

[0012] Preferably, the coil body is wound in a spiral manner.

[0013] Compared with the prior art, the present invention has the following beneficial effects: by setting a wire group, the wire group is wound to form a coil body, the wire group includes at least two wires, the arrangement direction of the wires is roughly the same as the progressive direction of the wire group, and the wires of the wire group are arranged in parallel, which is beneficial to improving the heating uniformity of the coil body when it is working. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic top view of the coil body of the first embodiment of the present invention.

[0015] Figure 2 This is a schematic cross-sectional view of the coil body of the first embodiment of the present invention.

[0016] Figure 3 This is a schematic top view of the structure of the first conductor and the coil frame assembled in the first embodiment of the present utility model.

[0017] Figure 4 This is a schematic top view of the assembly of the coil body and the coil frame according to the first embodiment of the present invention.

[0018] Figure 5 This is a schematic top view of the assembly of the coil body and the coil frame according to the second embodiment of the present invention.

[0019] Figure 6 Based on Figure 5 Schematic diagram of the decomposition.

[0020] Figure 7 This is a front view structural diagram of the assembly of the coil body and the coil frame according to the third embodiment of the present invention.

[0021] Figure 8 This is a schematic top view of the structure of a single winding and bobbin rack assembly in the prior art.

[0022] Figure 9 Based on Figure 8 Schematic diagram of the decomposition.

[0023] Figure 10 This is a front structural schematic diagram of a coil body according to the fourth embodiment of the present invention.

[0024] Figure 11 This is a schematic top view of the coil body of the fifth embodiment of the present invention.

[0025] Explanation of reference numerals: coil body 1; wire group 10; first conductor 101; second conductor 102; empty wire loop area 100; coil frame 2; conductor positioning groove 201; single winding 99; empty wire area 990; wire reel frame 98. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] The low inductance coil structure with uniform heating of the utility model is as follows: Figure 1 and Figure 2 As shown, the coil body 1 comprises a wire assembly 10. From a structural perspective, the wire assembly 10 is wound to form a coil body 1. The wire assembly 10 comprises at least two conductive wires, wherein each conductive wire can be a multi-stranded conductive wire. In other words, before the coil body 1 is wound, the conductive wires in a material state are separated from the conductive wires. When the coil body 1 is wound, for example, the conductive wires of the wire assembly 10 can be wound helically (or substantially helically) side by side. Figure 2 As shown, the arrangement direction of the wires is along the progressive direction of the wire group 10, that is, the arrangement direction of the wires is roughly the same as the progressive direction of the wire group 10. Specifically, the "arrangement direction of the wires" refers to the wire group 10, that is, the arrangement direction of the cross-sections of the wires of the wire group 10, and the "progressive direction of the wire group 10" refers to the coil body 1. The wire group 10 of the coil body 1 progresses once each time it is wound. So, for example, if the coil body 1 is in the shape of a flat disk, then the "arrangement direction of the wires" is roughly along the radial direction of the coil body 1, and the progressive direction of the wire group 10 is also roughly along the radial direction of the coil body 1; as shown in FIG. Figure 7 As shown, if the coil body 1 is cylindrical, then the "direction of arrangement of the wires" is generally parallel to the central axis of the coil body 1, and the progressive direction of the coil group 10 is also generally parallel to the central axis of the coil body 1. The difference is that when the coil body 1 is flat, the direction of arrangement of the wires is generally perpendicular to the central axis of the coil body 1, while when the coil body 1 is cylindrical, the direction of arrangement of the wires is generally parallel to the central axis of the coil body 1. If the coil body 1 is bowl-shaped, then both the "direction of progression of the coil group 10" and the "direction of arrangement of the wires" can be along an arc. The "direction of progression of the coil group 10" and the "direction of arrangement of the wires" can deviate within 15°. If the "direction of progression of the coil group 10" and the "direction of arrangement of the wires" deviate too much, it will significantly affect the heating uniformity of the coil body 1 during operation. The wires of the coil group 10 are arranged in parallel, that is, the wires belonging to the coil group 10 are connected in parallel.

[0028] like Figure 8 and Figure 9 As shown, the existing low inductance coil is formed by spirally winding a single winding wire 99, and the single winding wire 99 is gapped to form an empty wire area 990, and the single winding wire 99 is supported and positioned by a wire drum frame 98; Figure 5and Figure 6 As shown, the present invention is equivalent to splitting the existing single winding 99 and laying it flat on the coil frame 2. For example, Figure 3 and Figure 4 As shown, the wire group 10 may include two wires, namely a first wire 101 and a second wire 102. The wire positioning groove 201 on the coil frame 2 positions each wire of the wire group 10. When the outer diameter of the coil body 1 is set to a certain size and the inductance value of the coil body 1 is roughly determined, the coil structure of the present invention can make the wires arranged more densely, so that the magnetic field distribution generated by the coil body 1 during operation is more microscopically uniform; by Figure 5 and Figure 6 and Figure 8 It can be seen from the comparison that by setting the coil structure of the present invention, since the present invention is equivalent to splitting the existing single winding 99 and laying it flat on the coil frame 2, when the total number of winding turns of the wire group 10 is set to be the same as the total number of winding turns of the existing single winding 99, the wire located on the outside of the empty wire loop area 100 can be spread inward, and the wire located on the inside of the empty wire loop area 100 can be spread outward, so that the empty wire loop area 100 is filled with wires, and can even fill the empty wire loop area 100, so that the width of the empty wire loop area 100 of the present invention is significantly smaller than the width of the empty wire area 990 of the prior art, which can greatly improve the heating uniformity of the coil body 1.

[0029] Since the wire group 10 of the present invention replaces the existing single winding wire 99, the wire diameter of the wire of the wire group 10 can be smaller than the wire diameter of the single winding wire 99. Specifically, when the number of wires of the wire group 10 is set to two, the wire diameter of the wire can be set to 0.707 times to 0.5 times the wire diameter of the single winding wire 99, so that the thickness of the coil body 1 can be reduced, which is beneficial to reducing the internal space occupied by the coil body 1 in the induction cooker. When the coil body 1 is in the shape of a flat disk, it is beneficial to make the height of the induction cooker more compact. Since the wires of the wire group 10 are connected in parallel, and the total number of winding turns of the wire group 10 can be set to the same as the total number of winding turns of the existing single winding wire 99, the performance parameters of the coil body 1 can be slightly different from those of the prior art, so that the structure of the present invention can replace the structure of the prior art, but the coil structure of the present invention is beneficial to improving the heating uniformity and the height of the induction cooker can be more compact.

[0030] In some embodiments, as Figure 2 As shown, the wires within the coil body 1 are arranged at equal intervals. In other words, Figure 2The dimension "L" in the figure is equal to the dimension "X", that is, in the cross section of two wire groups 10 of adjacent turns of the coil body 1, the distance between the inner wire of the wire group 10 located on the relatively outer turn and the outer wire of the wire group 10 located on the relatively inner turn is equal to the spacing between the wires in the wire group 10. This makes the wires of the entire coil body 1 evenly distributed, which is beneficial to uniform heating of the coil body 1 during operation.

[0031] In some embodiments, as Figure 5 and Figure 6 As shown, the coil body 1 is formed with an empty wire loop area 100. Figure 6 For example, a corresponding gap is formed within the winding structure of the first conductor 101, and a corresponding gap is also formed within the winding structure of the second conductor 102. As described above, the conductors located outside the empty wire loop area 100 can be spread inward, and the guides located inside the empty wire loop area 100 can be spread outward, so that the empty wire loop area 100 is partially filled with conductors. When the outer diameter of the coil remains unchanged, the width of the empty wire loop area 100 of the present invention is significantly smaller than the width of the empty wire area 990 of the prior art, which can greatly improve the heating uniformity of the coil body 1. When the number of turns of the wire group 10 is fixed, the formation of the empty wire loop area 100 can significantly increase the maximum heating range of the coil body 1.

[0032] In some embodiments, as Figure 1 、 Figure 2 and Figure 5 As shown, the coil body 1 is in a flat disc shape, so the thickness of the coil body 1 is small. The coil body 1 is arranged in the induction cooker, which is beneficial for the height of the induction cooker to be set smaller.

[0033] In some embodiments, as Figure 7 As shown, the coil body 1 is cylindrical. In this case, the "arrangement direction of the wires" is roughly parallel to the central axis of the coil body 1, and the progressive direction of the wire group 10 is also roughly parallel to the central axis of the coil body 1. It can also be understood that the mutual orientation of the wire groups 10 of adjacent turns is roughly parallel to the central axis of the coil body 1. Figure 7 The structure of the coil body 1 shown is suitable for heating a cup-shaped magnetic conductive container, that is, the coil body 1 is wound around the outer side of the cylindrical outer wall of the cup-shaped container.

[0034] The coil body 1 can be densely wound, that is, the wires of the wire group 10 are arranged close to each other; the coil body 1 can also be sparsely wound, that is, there is a certain gap between the wires of the wire group 10.

[0035] In some embodiments, as Figure 10 As shown, the coil body 1 is in the shape of an arc bowl, so Figure 10 The coil body 1 shown is suitable for heating pots with a curved bottom.

[0036] In some embodiments, as Figure 1 As shown, the coil body 1 is wound in a concentric circle. In other words, each coil group 10 is circular, and each coil group 10 is concentrically arranged. After winding the first circle, the coil group 10 jumps to the second circle for winding, and so on. The above structure makes the inner and outer circles of the coil body 1 circular, making it easy to position the coil body 1 on the induction cooker.

[0037] In some embodiments, as Figure 11 As shown, the coil body 1 is wound in a spiral manner. In other words, the first conductive wire 101 and the second conductive wire 102 are both spiral wires, which makes the structure of the coil body 1 more uniform, and is conducive to the coil body 1 generating a uniform alternating magnetic field.

Claims

1. A low-inductance coil structure for uniform heating, characterized by: The invention comprises a wire group (10), wherein the wire group (10) is wound to form a coil body (1), wherein the wire group (10) comprises at least two conducting wires, wherein the arrangement direction of the conducting wires is along the progressive direction of the wire group (10), and the conducting wires of the wire group (10) are arranged in parallel.

2. The low-inductance coil structure for uniform heating according to claim 1, characterized in that: The conductive wires within the coil body (1) are arranged at equal intervals.

3. The low-inductance coil structure for uniform heating according to claim 1, characterized in that: The coil body (1) is formed with an empty wire loop area (100).

4. The low-inductance coil structure for uniform heating according to claim 1, characterized in that: The coil body (1) is in the shape of a flat disk.

5. The low-inductance coil structure for uniform heating according to claim 1, characterized in that: The coil body (1) is cylindrical.

6. The low-inductance coil structure for uniform heating according to claim 1, characterized in that: The coil body (1) is in an arc bowl shape.

7. The low-inductance coil structure for uniform heating according to claim 1, characterized in that: The coil body (1) is wound in a concentric circle manner.

8. The low-inductance coil structure for uniform heating according to claim 1, characterized in that: The coil body (1) is wound in a spiral manner.

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