A coil former

Abstract

This invention discloses a coil holder, including a coil body with coil grooves formed on it. Each coil groove includes a first groove segment and a second groove segment, the widths of which are different. This coil holder helps reduce the cost of electromagnetic coils and improves the heating effect of electromagnetic coils on cookware.

Description

Technical Field

[0001] This invention relates to the field of coil holders, and more specifically to a coil holder. Background Technology

[0002] Currently, electromagnetic coils consist of a frame and a coil. The frame is made of plastic and has coil slots formed on it. The coil is wound inside the coil slots, as shown in the invention patent announcement number CN203563225U "Magnetic strips and induction cooker coils for induction cookers". The coil slots are equal-width slots, meaning that the width of the slots from the bottom to the top is the same. In order to enable the coil slots to properly position the coil, the slot width is set to match the wire diameter of the wire (enameled stranded wire) used to wind the coil. However, this also means that the coil slots cannot accommodate wires of more than one wire diameter. To achieve power switching, some existing electromagnetic coils use inner and outer windings (each wound with enameled stranded wire). These inner and outer windings are annular, meaning the inner winding is located radially inside the outer winding. The inner and outer windings are concentric and can operate independently, allowing the inner winding to operate at lower power and the outer winding at higher power. However, when either the inner or outer winding operates independently, the area heated to the bottom of the cookware is relatively small. For example, when only the outer winding is working, the heating effect on the central area of ​​the cookware bottom is minimal. In other words, the structure of the inner and outer windings limits the electromagnetic coil's ability to heat the cookware. The heating effect on cookware is poor. If the upper and lower windings are set on the plate frame with equal area so that the two windings can work independently, for example, the lower winding can work with lower power and the upper winding can work with higher power. Therefore, the upper winding needs to be wound with wire of larger diameter. However, as mentioned above, because the coil slots are slots of equal width, the upper and lower windings are wound with wire of the same diameter. The wires of the upper and lower windings are stacked in the same coil slot, which leads to a waste of wire material in the lower winding. That is to say, the lower winding could have met the power requirements with wire of smaller diameter (because the current is smaller when the power is smaller). This will lead to a relative increase in the cost of the electromagnetic coil plate. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a coil holder that is beneficial for both reducing the cost of electromagnetic coils and improving the heating effect of electromagnetic coils on cookware.

[0004] The objective of this invention is achieved through the following technical solution.

[0005] The coil holder disclosed in this invention includes a coil body, on which a coil groove is formed. The coil groove includes a first groove segment and a second groove segment, wherein the first groove segment and the second groove segment have different groove widths.

[0006] Preferably, the coil slot has a slot bottom and a slot opening, one end of the first slot segment is connected to the slot bottom, the other end of the first slot segment is connected to one end of the second slot segment, the other end of the second slot segment is connected to the slot opening, and the slot width of the first slot segment is smaller than the slot width of the second slot segment.

[0007] Preferably, a step is formed between the first groove segment and the second groove segment.

[0008] Preferably, the steps are provided on both sides of the coil groove.

[0009] Preferably, the step is a platform step.

[0010] Preferably, the slot is located above the corresponding part of the bottom of the slot.

[0011] Preferably, the first groove segment and / or the second groove segment are straight groove segments.

[0012] Preferably, the disc body has ribs, the coil grooves are formed between radially adjacent ribs, and the disc body has circumferentially distributed fan-shaped through grooves.

[0013] Preferably, the upper and lower ends of the coil groove are respectively formed with slots, the second groove segment is located above the first groove segment, and a dividing spoke is provided at the connection between the upper end of the first groove segment and the lower end of the second groove segment. The dividing spokes are circumferentially distributed around the central axis of the disc.

[0014] Compared with the prior art, the beneficial effects of this invention are as follows: by forming a coil groove on the plate body, the coil groove includes a first groove segment and a second groove segment, and the first groove segment and the second groove segment are configured with different groove widths, wires of different diameters can be wound in the first groove segment and the second groove segment respectively. This makes the coil plate frame of this invention both beneficial to reducing the cost of the electromagnetic coil plate and beneficial to improving the heating effect of the electromagnetic coil plate on the cookware. Attached Figure Description

[0015] Figure 1 This is a top-view perspective view of the coil holder according to the first embodiment of the present invention.

[0016] Figure 2 for Figure 1 A partial structural diagram at point A.

[0017] Figure 3 This is a bottom-view perspective view of the three-dimensional structure of the magnetic strip assembled with the coil holder of the first embodiment of the present invention.

[0018] Figure 4 This is a cross-sectional schematic diagram showing the assembled state of the magnetic strip, the first coil, and the coil holder according to the first embodiment of the present invention.

[0019] Figure 5 This is an exploded perspective view of the first coil and the coil holder of the first embodiment of the present invention.

[0020] Figure 6 This is a cross-sectional schematic diagram showing the assembled state of the magnetic strip, the second coil, and the coil holder according to the first embodiment of the present invention.

[0021] Figure 7 This is a partial schematic diagram showing the assembled state of the magnetic strip, the first coil, the second coil, and the coil holder according to the first embodiment of the present invention.

[0022] Figure 8 This is a partial schematic diagram showing the assembled state of the magnetic strip, the first coil, the second coil, and the coil holder according to the second embodiment of the present invention.

[0023] Figure 9 This is a partial schematic diagram showing the assembled state of the magnetic strip, the first coil, the second coil, and the coil holder according to the third embodiment of the present invention.

[0024] Labeling explanation: Disc body 1; Coil slot 11; First slot segment 111; Slot bottom 1111; Second slot segment 112; Separating spokes 116; Slot opening 1121; Step 113; Rib 12; Fan-shaped through slot 13; First coil 2; Second coil 3; Magnetic strip 4. Detailed Implementation

[0025] The present invention will now be further described with reference to the accompanying drawings.

[0026] The coil holder of the present invention, as shown Figures 1 to 4 As shown, the device includes a disk body 1, on which coil grooves 11 are formed. Each coil groove 11 includes a first groove segment 111 and a second groove segment 112. The first groove segment 111 and the second groove segment 112 have different widths, as shown below. Figure 2 As shown, the width of the first slot segment 111 (size "X") is not equal to the width of the second slot segment 112 (size "Y"), meaning that in the depth direction of the coil slot 11, the coil slot 11 includes at least two slot segments of unequal width.

[0027] like Figure 4 and Figure 5 As shown, the electromagnetic coil disk can be equipped with a magnetic strip 4, a first coil 2, and the coil disk frame of the present invention. The electromagnetic coil disk can be applied to an induction cooker. The magnetic strip 4 can be set in a groove on the lower side of the disk body 1, as shown. Figure 7 As shown, the first coil 2 can be wound inside the coil slot 11. Specifically, the first coil 2 can be wound inside the first slot segment 111. In the radial direction of the first coil 2, the width of the first conductor (which is enameled stranded wire) used to wind the first coil 2 is adapted to the slot width of the first slot segment 111 (e.g., ...). Figure 2The dimension “X” in the first slot segment 111 can be used to position the first wire radially in the first coil 2, such as... Figure 4 As shown, if the cross-section of the first conductor is approximately circular, then the width of the first conductor in the radial direction of the first coil 2 is equal to the diameter of the first conductor. Figure 6 As shown, the electromagnetic coil disk may be equipped with a magnetic strip 4, a second coil 3, and the coil disk frame of the present invention, as follows. Figure 7 As shown, the second coil 3 can be wound within the second slot section 112. In the radial direction of the second coil 3, the width of the second conductor (enameled stranded wire) used for winding the second coil 3 is adapted to the slot width of the second slot section 112 (e.g., ...). Figure 2 The second slot 112, with its dimension "Y", allows the second conductor to be positioned radially in the second coil 3. In other words, the first conductor of the first coil 2 and the second conductor of the second coil 3 have different wire diameters. This means the coil holder of the present invention can accommodate conductors of more than one wire diameter, allowing conductors of different diameters to be wound separately in the first and second slots. For example, the first slot 111 can be made narrower, while the second slot 112 can be made wider. Figure 7 As shown, the first coil 2 with a smaller wire diameter can be wound in the first slot 111, and the second coil 3 with a larger wire diameter can be wound in the second slot 112. When the first coil 2 works independently (at which time the second coil 3 does not work), the electromagnetic coil disk equipped with the coil disk frame of the present invention operates at a lower power. When the second coil 3 works independently (at which time the first coil 2 does not work), the electromagnetic coil disk operates at a higher power. Because the first wire of the first coil 2, which operates at lower power, has a smaller wire diameter, the first slot 111 can also properly position the first wire. Therefore, in practical applications, the smaller wire diameter of the first wire of the first coil 2 helps to reduce the cost of the electromagnetic coil disk. Figure 1 Combination Figure 7 As shown, since the coil slot 11 includes a first slot segment 111 and a second slot segment 112, the first coil 2 and the second coil 3 are actually wound in the same coil slot 11. Therefore, the first coil 2 and the second coil 3 can be set with approximately equal heating areas, which eliminates the need for the concentric arrangement of the inner and outer windings in the prior art. When using the electromagnetic coil with the coil holder of the present invention to heat the pot located above the electromagnetic coil, it can avoid the situation where only the center part of the bottom of the pot receives normal heating or only the outer periphery of the bottom of the pot receives normal heating. In other words, the coil holder of the present invention is beneficial to improving the heating effect of the electromagnetic coil on the pot.

[0028] In some applications, for example, the first wire of the first coil 2 can be a copper wire, and the second wire of the second coil 3 can be an aluminum wire. The manufacturer of the electromagnetic coil can keep the coil frame of this invention readily available. If the customer needs to use copper wire, the first slot 111 is used because its slot width is smaller, while the second slot 112 is used because its slot width is larger. Also, because the resistivity of copper wire is lower, the first slot 111 is used. If the customer needs to use aluminum wire, the second slot 112 is used. In other words, this invention facilitates flexible production of electromagnetic coils and allows manufacturers to quickly respond to customer requirements for coil materials. It also avoids the need for manufacturers to produce two different coil frames, which would increase mold costs. Therefore, this invention is relatively cost-effective.

[0029] Furthermore, such as Figure 2 As shown, the coil slot 11 has a slot bottom 1111 and a slot opening 1121. One end of the first slot segment 111 is connected to the slot bottom 1111, and the corresponding other end of the first slot segment 111 is connected to one end of the second slot segment 112. The corresponding other end of the second slot segment 112 is connected to the slot opening 1121, that is, the slot opening 1121 is located at the corresponding other end of the second slot segment 112. The slot width of the first slot segment 111 (i.e., Figure 2 The dimension “X” in the middle is smaller than the width of the second slot segment 112 (i.e., Figure 2 Given the dimension “Y” in the diagram, when the first coil 2 is wound into the first slot 111, the first wire of the first coil 2 can pass through the slot opening 1121 into the second slot 112, and then into the first slot 111. Since one end of the first slot 111 is connected to the slot bottom 1111, the slot bottom 1111 can be used to position the first coil 2 in conjunction with the first slot 111. Because the slot width of the first slot 111 is smaller than the slot width of the second slot 112, when the second coil 3 is wound in the second slot 112, the second wire of the second coil 3 is wider in the radial direction than the slot width of the first slot 111, thus preventing the second coil 3 from entering the first slot 111.

[0030] Furthermore, such as Figure 2 As shown, a step 113 is formed between the first slot segment 111 and the second slot segment 112. In other words, the slot wall of the first slot segment 111 and the slot wall of the second slot segment 112 are connected as one unit by the step 113. Since the slot width of the first slot segment 111 is smaller than the slot width of the second slot segment 112, that is, the step 113 faces the slot opening 1121. When the second coil 3 is wound from the slot opening 1121 into the second slot segment 112, the step 113 can block the second wire of the second coil 3. Then the step 113, together with the second slot segment 112, positions the second coil 3.

[0031] Furthermore, such as Figure 2As shown, steps 113 are provided on both sides of the coil slot 11, as... Figure 6 As shown, in the radial direction of the second coil 3, the two ends of the second wire of the second coil 3 are respectively located on the upper side of the step 113, so that the second wire can be positioned by the corresponding step 113 on both sides, which is beneficial to improving the positioning effect of the coil slot 11 on the second coil 3.

[0032] Furthermore, such as Figure 2 and Figure 6 As shown, step 113 is a platform step, meaning that step 113 is perpendicular to the central axis of the disc 1, which makes the structure of step 113 relatively simple and facilitates the manufacture of the injection mold corresponding to the disc 1. When the second coil 3 is wound into a flat disc structure, step 113 is parallel to the second coil 3.

[0033] Furthermore, such as Figure 1 and Figure 2 As shown, the slot 1121 is located above the corresponding slot bottom 1111. That is to say, the coil slot 11 is set to open upwards and has a structure that is larger at the top and smaller at the bottom. The second slot segment 112 is located above the first slot segment 111. Thus, the step 113 can support the weight of the second coil 3, and the slot bottom 1111 can support the weight of the first coil 2.

[0034] In some embodiments, such as Figure 8 As shown, the slot 1121 can be located below the corresponding bottom of the slot 1111, which is equivalent to inverting the coil slot 11. The coil slot 11 has a structure that is smaller at the top and larger at the bottom. The width of the first slot segment 111 is smaller than the width of the second slot segment 112. The second slot segment 112 is located below the first slot segment 111. The first coil 2 can be wound on the first slot segment 111 first, and then the second coil 3 can be wound on the second slot segment 112. Then, epoxy resin potting compound is filled into the slot 1121. After the epoxy resin potting compound has dried, the coil slot 11 is inverted so that the slot 1121 is located below the corresponding bottom of the slot 1111.

[0035] In some embodiments, such as Figure 9As shown, slots 1121 are formed at the upper and lower ends of the coil slot 11. The width of the first slot segment 111 of the coil slot 11 is smaller than the width of the second slot segment 112 of the coil slot 11. The second slot segment 112 is located above the first slot segment 111. That is, the lower end of the first slot segment 111 is connected to the slot 1121 located at the lower position, and the upper end of the second slot segment 112 is connected to the slot 1121 located at the upper position. A dividing spoke 116 can be provided at the connection between the upper end of the first slot segment 111 and the lower end of the second slot segment 112. The dividing spoke 116 is circumferentially distributed around the central axis of the disc body 1. Thus, the second coil 3 can be wound in the second slot segment 112 through the upper slot 1121, and the first coil 2 can be wound in the first slot segment 111 through the lower slot 1121. The dividing spoke 116 can separate the first coil 2 and the second coil 3.

[0036] Furthermore, such as Figure 2 As shown, the first groove segment 111 and / or the second groove segment 112 are straight groove segments. That is, the sidewalls of the first groove segment 111 and / or the sidewalls of the second groove segment 112 are parallel to the central axis of the disc body 1. This makes the structure of the coil groove 11 simpler and the injection mold corresponding to the disc body 1 easier to manufacture. In other words, it avoids increasing the processing difficulty of the injection mold corresponding to the disc body 1 by setting the second groove segment 112 to a structure that gradually shrinks from top to bottom. When the first wire of the first coil 2 is located in the first groove segment 111, the sidewalls of the first groove segment 111 are located on both sides of the first wire of the first coil 2 (in the radial direction of the first coil 2). Because the first groove segment 111 is a straight groove segment, the groove width of the first groove segment 111 is equal at all points in the vertical direction. When the depth position of the first coil 2 in the first groove segment 111 changes locally, the radial positioning effect of the first groove segment 111 on the first coil 2 can be avoided. Therefore, the sidewalls of the first groove segment 111 provide good radial positioning for the first wire of the first coil 2 in the disc body 1.

[0037] Furthermore, such as Figure 1 and Figure 2As shown, the disk body 1 has ribs 12, and coil slots 11 are formed between radially adjacent ribs 12 (here, "radial" refers to the radial direction of the disk body 1). The ribs 12 are concentrically distributed about the central axis of the disk body 1. In other words, the coil slots 11 are concentrically distributed about the central axis of the disk body 1. The coil slots 11 are circumferentially extended around the central axis of the disk body 1. However, the distribution direction of the first slot segment 111 relative to the second slot segment 112 is the direction of the central axis of the disk body 1. A fan-shaped through slot 13 is formed on the disk body 1. Thus, the fan-shaped through slot 13 penetrates the corresponding ribs 12 vertically. For example, only the innermost and outermost ribs 12 are not penetrated by the fan-shaped through slot 13. Therefore, the first wire of the first coil 2 is not completely hidden in the first slot segment 111. It can be understood that, in the circumferential direction of the disk body 1, the first coil 2 is partially located outside the coil slot 11, which is beneficial for the heat dissipation of the first coil 2. Because the coil slot 11 is formed between radially adjacent ribs 12, and the fan-shaped through slot 13 partially penetrates the ribs 12 vertically, it helps to reduce the rigidity of the ribs 12. The frame 1 is made of plastic, and the ribs 12 will have elasticity. Taking the second coil 3 as an example, when the second coil 3 is wound into the coil slot 11, the second wire of the second coil 3 may touch the edge of the slot opening 1121. However, the edge of the slot opening 1121 can be slightly squeezed open by the second wire. That is to say, the corresponding rib 12 can be slightly elastically deformed, so that the second wire can smoothly enter the corresponding second slot segment 112, which makes it easier to wind the second coil 3. During the winding of the second coil 3, after the second wire is wound around the coil slot 11 once, the second wire can jump to the next adjacent coil slot 11 at the position of the fan-shaped through slot 13.

[0038] like Figure 7 As shown, in some cases, the first coil 2 and the second coil 3 can be wound simultaneously in the coil slot 11, the first coil 2 and the second coil 3 can be connected in parallel, and the first wire of the first coil 2 can be a copper wire or an aluminum wire, and the second wire of the second coil 3 can also be a copper wire or an aluminum wire.

Claims

1. A coil holder, characterized in that: The device includes a disc body (1) on which a coil groove (11) is formed. The coil groove (11) includes a first groove segment (111) and a second groove segment (112), and the first groove segment (111) and the second groove segment (112) have different groove widths.

2. The coil holder according to claim 1, characterized in that: The coil slot (11) has a slot bottom (1111) and a slot opening (1121). One end of the first slot segment (111) is connected to the slot bottom (1111), and the other end of the first slot segment (111) is connected to one end of the second slot segment (112). The other end of the second slot segment (112) is connected to the slot opening (1121). The slot width of the first slot segment (111) is smaller than the slot width of the second slot segment (112).

3. The coil holder according to claim 2, characterized in that: A step (113) is formed between the first groove segment (111) and the second groove segment (112).

4. The coil holder according to claim 3, characterized in that: The steps (113) are provided on both sides of the coil groove (11).

5. The coil holder according to claim 4, characterized in that: The step (113) is a platform step.

6. The coil holder according to claim 2, characterized in that: The slot (1121) is located above the corresponding part of the bottom of the slot (1111).

7. The coil holder according to any one of claims 1 to 6, characterized in that: The first groove segment (111) and / or the second groove segment (112) are straight groove segments.

8. The coil holder according to any one of claims 1 to 6, characterized in that: The disc body (1) has ribs (12) formed, the coil groove (11) is formed between radially adjacent ribs (12), and the disc body (1) has circumferentially distributed fan-shaped through grooves (13).

9. The coil holder according to claim 1, characterized in that: The upper and lower ends of the coil groove (11) are respectively formed with slots (1121). The second slot segment (112) is located on the upper side of the first slot segment (111). A dividing spoke (116) is provided at the connection between the upper end of the first slot segment (111) and the lower end of the second slot segment (112). The dividing spoke (116) is circumferentially distributed around the central axis of the disc body (1).

Images