Coil device and transformer

Abstract

The utility model relates to a coil device and a transformer, and the coil device comprises a first coil, at least a second coil which sleeves the axial outer side of the first coil, and cushion blocks which are arranged on the first coil and the second coil. The cushion blocks comprise a first group of cushion blocks arranged on the axial end part of the first coil and a second group of cushion blocks arranged on the axial end part of the second coil on the same side as the axial end part, and the first group of cushion blocks comprise a plurality of first cushion blocks uniformly arranged along the circumference of the axial end part of the first coil; and the second group of cushion blocks comprises a plurality of second cushion blocks which are uniformly arranged along the circumference of the axial end part of the second coil, and the plurality of first cushion blocks and the plurality of second cushion blocks are respectively arranged in a way that a gap between two adjacent cushion blocks on the axial end part is greater than or equal to the diameter of a wire forming the first coil and the second coil. By improving the arrangement of the cushion blocks on the coil of the transformer, the anti-short-circuit capability and the heat dissipation capability of the transformer are improved, and time and cost are saved.

Description

Technical Field

[0001] The present disclosure relates to a transformer, and in particular, to a spacer arranged on a coil of the transformer. Background Art

[0002] The number of transformer coil spacers is determined by many factors, including the short-circuit force borne by the coil, the inner and outer diameters of the coil, the spacer width, and production capacity.

[0003] At present, the number of pads arranged on the multiple coils wound from the inside to the outside of the transformer core is either the same or twice the number of pads. For example, when the number of pads of the inner coil is equal to the number of pads of the outer coil, the pad spacing of the inner coil is small, and the inner coil cannot adopt pad transposition, under the premise that the outer coil meets the short-circuit resistance requirements. In this field, pad transposition means that each inner coil or each outer coil has a preset number of wire winding turns in the axial direction, and the two inner coils or two outer coils stacked in the axial direction are connected via the gaps between the multiple pads on the ends of the lower inner coil or outer coil. When the number of pads of the outer coil is twice the number of pads of the inner coil, under the premise that the inner coil meets the short-circuit resistance requirements, the pad spacing of the outer coil is small, and the outer coil cannot adopt pad transposition. Utility Model Content

[0004] In view of this, the present disclosure proposes to improve the arrangement of the gasket on the coil of the transformer. The improved arrangement of the gasket on the coil of the transformer not only improves the short-circuit resistance and heat dissipation capacity of the transformer, but also enables the inner coil and the outer coil to adopt an improved connection method, saving time and cost.

[0005] The embodiments of the present disclosure provide a spacer block arranged on the coil of a transformer and a transformer including the spacer block, so as to at least solve the problems in the prior art of shortening the connection of the transformer coil, resulting in long production time, high cost, low short-circuit resistance and low heat dissipation capacity of the transformer.

[0006] According to one aspect of the present application, a coil device is provided, wherein the coil of the device includes a first coil and at least a second coil sleeved on the axial outside of the first coil; the gaskets include a first group of gaskets arranged on the axial end of the first coil and a second group of gaskets arranged on the axial end of the second coil on the same side as the axial end, the first group of gaskets includes a plurality of first gaskets evenly arranged along the circumference of the axial end of the first coil, and the second group of gaskets includes a plurality of second gaskets evenly arranged along the circumference of the axial end of the second coil, wherein the plurality of first gaskets and the plurality of second gaskets are respectively arranged so that the gap between two adjacent gaskets at the axial end is greater than or equal to the diameter of the wire constituting the first coil and the second coil.

[0007] In this way, the present application arranges multiple first gaskets and multiple second gaskets respectively so that the gap between two adjacent gaskets at the axial end is greater than or equal to the diameter of the wire constituting the first coil and the second coil, so that the spacing between the gaskets is appropriate when the coils are connected, avoiding the need to shorten the gaskets to make space for the wire connecting the two coils to pass through. When the gaskets are not shortened, this further improves the mechanical strength of the coil and the short-circuit resistance of the transformer, and also saves the production time and production cost of the transformer.

[0008] According to an exemplary embodiment of the present application, the number of the plurality of second spacers is a non-integer multiple of the number of the plurality of first spacers.

[0009] In this way, the present application makes the spacing between the spacers appropriate when the coils are connected by further defining the quantitative relationship between the first spacers and the second spacers.

[0010] According to an exemplary embodiment of the present application, when another first coil is stacked on the axial end of the first coil, the wire led out from the other first coil passes through the gap between two adjacent ones of the plurality of first blocks on the axial end of the first coil and is connected to the first coil, and / or when another second coil is stacked on the axial end of the second coil, the wire led out from the other second coil passes through the gap between two adjacent ones of the plurality of second blocks on the axial end of the second coil and is connected to the second coil.

[0011] In this way, multiple inner / outer coils stacked in the axial direction can be connected to two inner coils or two outer coils by using an improved spacer arrangement. Furthermore, in the case of avoiding shortening the spacers for connection, this avoids adding expensive wedge-shaped spacers at the connection position, thereby saving production materials.

[0012] According to an exemplary embodiment of the present application, there is a gap in the axial direction between the stacked first coil and the stacked second coil for the insulating oil to flow; there is a gap between two adjacent first gaskets in the first group of gaskets for the insulating oil to flow and / or there is a gap between two adjacent second gaskets in the second group of gaskets for the insulating oil to flow.

[0013] In this way, by adopting the improved spacer arrangement, axial oil passages and radial oil passages are provided in the coil of the transformer of the present application, thereby further improving the insulation and heat dissipation performance of the coil of the transformer.

[0014] According to an exemplary embodiment of the present application, a ratio of the number of the plurality of first spacers to the number of the plurality of second spacers is 3:4 or 2:3.

[0015] In this way, the ratio of the number of pads of the inner coil to the number of pads of the outer coil is not limited to 3:4, and may also be 2:3, but the present application is not limited thereto.

[0016] According to an exemplary embodiment of the present application, the first coil and the second coil respectively have a preset number of wire winding turns along the axial direction, and further, the preset number of wire winding turns is at least 6.

[0017] In this way, the present application can determine the number of wire windings based on the actual performance such as capacity and impedance actually required by the transformer, so that the produced transformer meets customer needs.

[0018] According to an exemplary embodiment of the present application, the first block and the second block are respectively arranged across the axial end from the inner diameter side to the outer diameter side of the axial end, and the first block and the second block respectively have protruding portions on the inner diameter side and the outer diameter side relative to the axial end, and the protruding portions are used to suspend the stay along the axial direction.

[0019] In this way, the present application specifically defines the positional relationship between each spacer and the corresponding coil, and defines that the protruding portion of the spacer relative to the coil is used to suspend the stay in the axial direction. The stay in the axial direction not only increases the axial stability of the transformer, but also forms an oil path for the insulating oil for cooling.

[0020] According to another aspect of the present application, a transformer is provided, comprising the aforementioned coil arrangement.

[0021] In this way, the present application proposes an improved transformer, which includes an improved coil device, can achieve improved mechanical strength of the coil and short-circuit resistance and heat dissipation capabilities of the transformer, saving production time and production costs.

[0022] In an embodiment of the present application, a technical solution is provided in which a plurality of pads evenly arranged at the axial end of the inner coil and a plurality of pads evenly arranged at the axial end of the outer coil are arranged so that the gap between two adjacent pads at the axial end is greater than or equal to the diameter of the wire constituting the first coil and the second coil, so as to at least solve the technical problem in the prior art that the spacing between the pads in the inner and outer coils is not appropriate, so as to shorten the pads to make space for coil connection, resulting in poor short-circuit resistance and heat dissipation capacity of the transformer, long production time and high cost, thereby achieving the technical effect of improving the mechanical strength of the coil and the short-circuit resistance and heat dissipation capacity of the transformer, saving production time and production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 is a top view showing a spacer arranged on a coil of a transformer;

[0025] Reference Numbers

[0026] 1: First coil;

[0027] 2: Second coil;

[0028] 3: The first pad;

[0029] 4: The second pad. DETAILED DESCRIPTION

[0030] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as being limited to the embodiments described herein. In the accompanying drawings, for the sake of clarity, parts that are irrelevant to the description of the present application will be omitted. Similar reference numerals refer to similar elements throughout the description. In addition, when providing a description with reference to the accompanying drawings, although the elements are represented by the same numerals, the reference numerals relating to the elements may be changed, and the reference numerals are described only for the convenience of description, and should not be understood as the concept, feature, function or effect of the element being limited by the reference numeral.

[0031] At present, in order to solve the problem that the spacing between the pads on the inner coil or the outer coil is not appropriate when the number ratio of the pads on the inner coil and the outer coil is an integer multiple, multiple coils stacked along the axial direction are connected across the pads (i.e., transposition across the pads). In other words, the connection center is at the center of the pads, and the pads need to be shortened to make room for the connection of the coils. When the size of the connecting wire is large, it is also necessary to add an expensive wedge-shaped pad at the connection center.

[0032] In view of the technical problems existing in the prior art, the present application proposes to improve the arrangement of the pads on the inner coil and the pads on the outer coil.

[0033] Figure 1 is a top view showing a spacer arranged on a coil of a transformer.

[0034] like Figure 1 As shown, the first coil 1 and the second coil 2 are arranged on the iron core (not shown) of the transformer from the inside to the outside, the diameter of the second coil is larger than the first coil, and there is a gap between the second coil and the first coil. The first coil 1 and the second coil 2 have a preset number of wire windings in the axial direction, respectively, and the number of wire windings depends on the actual requirements of the transformer performance, for example, the number of wire windings is determined according to the actual capacity and impedance required by the transformer. For example, the preset number of wire windings is at least 6, and the present application is incorporated to this limit.

[0035] When the first coil 1 and the second coil 2 are arranged vertically in the axial direction, the first group of spacers is arranged on the axial upper end of the first coil 1 , and the second group of spacers is arranged on the axial upper end of the second coil 2 .

[0036] For example, each first pad 3 in the first group of pads is arranged across the upper end of the first coil 1 from the inner diameter side to the outer diameter side of the axial upper end, and each second pad 4 in the second group of pads is arranged across the upper end of the second coil 2 from the inner diameter side to the outer diameter side of the axial upper end. Specifically, the edge of the first pad 3 on the inner diameter side of the first coil 1 protrudes from the inner diameter edge of the first coil 1 by 4-5mm, and the edge of the first pad 3 on the outer diameter side of the first coil 1 protrudes from the outer diameter edge of the first coil 1 by 4-5mm; the edge of the second pad 4 on the inner diameter side of the second coil 2 protrudes from the inner diameter edge of the second coil 2 by 4-5mm, and the edge of the second pad 4 on the outer diameter side of the second coil 2 protrudes from the outer diameter edge of the second coil 2 by 4-5mm.

[0037] In addition, the two protruding parts on the inner diameter side and the outer diameter side of the first cushion block 3 and the second cushion block 4 respectively have slots, which are used to hang the stays in the axial direction. The stays in the axial direction not only increase the axial stability of the transformer, but also form an oil path for insulating oil for cooling.

[0038] The number of pads arranged on the first coil 1 and the second coil 2 is determined by various factors such as the short-circuit force borne by the coils, the coil diameter, the pad width, the production capacity, etc. For example, when the short-circuit force borne by the coils is a specific value, the short-circuit force borne by the area of ​​each pad is calculated based on the pad width and length, and the number of pads is determined based on the short-circuit force borne by the area of ​​each pad.

[0039] The first group of pads includes a plurality of first pads 3 that are evenly arranged along the circumference of the upper end of the first coil 1 , and the second group of pads includes a plurality of second pads 4 that are evenly arranged along the circumference of the upper end of the second coil 2 .

[0040] The plurality of first pads 3 and the plurality of second pads 4 are respectively arranged so that the gap between two adjacent pads at the upper end is greater than or equal to the diameter of the wire constituting the first coil 1 and the second coil 2. Furthermore, the number of the plurality of second pads 4 is a non-integer multiple of the number of the plurality of first pads 3, for example, the ratio of the number of the plurality of first pads 3 to the number of the plurality of second pads 4 is 3:4, however, the utility model is not limited thereto.

[0041] When the number of the plurality of first pads 3 and the number of the plurality of second pads 4 are in an integer multiple relationship, for example, 1:2, when the first coil 1 meets the required short-circuit resistance and heat dissipation capabilities, the pad spacing of the second coil 2 is small, resulting in the inability to connect the plurality of stacked second coils 2 through the gaps between adjacent pads.

[0042] The present application proposes that the gap between two adjacent pads on the upper end portion is greater than or equal to the diameter of the wire constituting the first coil 1 and the second coil 2. Furthermore, the number of the plurality of second pads 4 is a non-integer multiple of the number of the plurality of first pads 3, thereby avoiding the above-mentioned problems. For example, every 3 pads in the plurality of first pads 3 correspond to every 4 pads in the plurality of second pads 4. Thus, the pad spacing between the first coil 1 and the second coil 2 is appropriate, and the plurality of stacked first coils 1 can be connected by passing through the gaps between adjacent pads, and the plurality of stacked second coils 4 can be connected by passing through the gaps between adjacent pads. There is no need to shorten the pads to make space for connection, thereby saving production time.

[0043] Since the arrangement of the gasket and the connection of the connecting wire avoids shortening the gasket, the gasket can withstand stronger short-circuit resistance. Therefore, the present application can improve the mechanical properties of the coil and the short-circuit resistance of the transformer, save production time and reduce production costs.

[0044] Specifically, when another first coil is stacked on the upper end of the first coil 1 in the axial direction, the wire led out from the other first coil passes through the gap between two adjacent pads of the plurality of first pads 3 on the upper end of the first coil 1 and is connected to the first coil 1;

[0045] When another second coil is stacked axially on the upper end of the second coil 2 , the wire led out from the other second coil passes through the gap between two adjacent second blocks 4 on the upper end of the second coil 2 and is connected to the second coil 2 .

[0046] Thus, without damaging the spacers, the connecting wires connect the upper and lower coils via the gaps between the adjacent spacers. Even when the connecting wires are larger in size, there is no need to use wedge-shaped spacers. This not only improves the mechanical properties of the coils and the short-circuit resistance of the transformer, but also saves production time and materials.

[0047] like Figure 1 As shown, there is a gap between the first coil 1 and the second coil 2 along the axial direction to allow insulating oil to flow.

[0048] Therefore, the present application can achieve axial heat dissipation of the coil of the transformer via the axial gap.

[0049] like Figure 1As shown, there is a gap between two adjacent pads in the plurality of first pads 3 to allow the insulating oil to flow; there is a gap between two adjacent pads in the plurality of second pads 4 to allow the insulating oil to flow.

[0050] Therefore, the present application can achieve radial heat dissipation of the coil of the transformer via the radial gap.

[0051] Therefore, the present application can enhance the heat dissipation capability of the transformer coil.

[0052] The present application also provides an improved transformer, which includes the first coil 1, the second coil 2 and a plurality of spacers arranged on the first coil 1 and the second coil 2 as described above.

[0053] In an embodiment of the present application, a technical solution is provided in which a plurality of pads evenly arranged at the axial end of the inner coil and a plurality of pads evenly arranged at the axial end of the outer coil are arranged so that the gap between two adjacent pads at the axial end is greater than or equal to the diameter of the wire constituting the first coil and the second coil, so as to at least solve the technical problem in the prior art that the spacing between the pads in the inner and outer coils is not appropriate, so as to shorten the pads to make space for coil connection, resulting in poor short-circuit resistance and heat dissipation capacity of the transformer, long production time and high cost, thereby achieving the technical effect of improving the mechanical strength of the coil and the short-circuit resistance and heat dissipation capacity of the transformer, saving production time and production cost.

[0054] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0055] In the several embodiments provided in this application, it should be understood that the disclosed technical contents can be implemented in other ways.

[0056] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A coil device, comprising a first coil (1), at least a second coil (2) sleeved on the axial outside of the first coil, and a spacer arranged on the first coil and the second coil, characterized in that: The spacers include a first group of spacers arranged on an axial end of the first coil (1) and a second group of spacers arranged on an axial end of the second coil on the same side as the axial end. The first group of spacers includes a plurality of first spacers (3) uniformly arranged along the circumference of the axial end of the first coil, and The second group of spacers includes a plurality of second spacers (4) uniformly arranged along the circumference of the axial end of the second coil. The plurality of first spacers and the plurality of second spacers are respectively arranged such that a gap between two adjacent spacers at the axial end is greater than or equal to a diameter of the conductive wire constituting the first coil and the second coil.

2. The coil device according to claim 1, characterized in that The number of the second spacers is a non-integer multiple of the number of the first spacers.

3. The coil device according to claim 1, characterized in that When another first coil is stacked on the axial end of the first coil, the wire led out from the another first coil passes through the gap between two adjacent ones of the plurality of first blocks on the axial end of the first coil and is connected to the first coil, and / or when another second coil is stacked on the axial end of the second coil, the wire led out from the another second coil passes through the gap between two adjacent ones of the plurality of second blocks on the axial end of the second coil and is connected to the second coil.

4. The coil device according to claim 3, characterized in that There is a gap in the axial direction between the stacked first coils and the stacked second coils for the insulating oil to flow, there is a gap between two adjacent first pads in the first group of pads for the insulating oil to flow and / or there is a gap between two adjacent second pads in the second group of pads for the insulating oil to flow.

5. The coil device according to claim 1, characterized in that The ratio of the number of the plurality of first cushion blocks to the number of the plurality of second cushion blocks is 3:4 or 2:

3.

6. The coil device according to claim 1, characterized in that The first coil and the second coil each have at least 6 wire winding turns in the axial direction.

7. The coil device according to claim 1, characterized in that The first and second spacers are arranged across the axial end portion from the inner diameter side to the outer diameter side of the axial end portion, and have protruding portions on the inner diameter side and the outer diameter side relative to the axial end portion, respectively, for suspending the stay in the axial direction.

8. The coil device according to claim 1, characterized in that The number of spacers arranged on the first coil and the second coil depends on at least one of the following factors: the short-circuit force borne by the coil, the coil diameter, the spacer width and the production capacity.

9. A transformer comprising the coil arrangement according to any one of claims 1 to 8.

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