CN214898006U

CN214898006U - Transformer coil with hem insulation system

Info

Publication number: CN214898006U
Application number: CN202120833910.3U
Authority: CN
Inventors: 葛旭; 李维; 罗华
Original assignee: Deyang Xinyuan Electric Appliance Co ltd
Current assignee: Deyang Xinyuan Electric Appliance Co ltd
Priority date: 2021-04-22
Filing date: 2021-04-22
Publication date: 2021-11-26
Anticipated expiration: 2031-04-22

Abstract

The utility model discloses a transformer coil with hem insulation system, the foil that solves current transformer coil is complicated and the loaded down with trivial details technical problem of insulation treatment around coil coiling operation. The utility model comprises a wire-wound coil and a foil-wound coil which are both in a cylindrical structure, wherein the wire-wound coil is sleeved on the periphery of the foil-wound coil; the wire-wound coil comprises a plurality of layers of wire-wound windings which are mutually attached and distributed at intervals and wire-wound interlayer insulation; the foil-wound coil is formed by winding a first layer of conductive foil, a foil-wound interlayer insulation layer and a second layer of conductive foil which are sequentially attached from inside to outside together, and edge-folded insulation structures used for wrapping the conductive foils are arranged at two ends of the foil-wound interlayer insulation layer. The utility model discloses having adopted reasonable coiling and insulation treatment according to the different constitutions of coil, overall structure has obtained fairly simplifying, and insulating security performance has obtained the reinforcing, and anti short circuit ability has obtained fine improvement simultaneously, has improved the whole quality and the manufacturing efficiency of product greatly.

Description

Transformer coil with hem insulation system

Technical Field

The utility model belongs to the technical field of transformer coil, concretely relates to transformer coil with hem insulation system.

Background

The transformer is a device for changing alternating voltage by utilizing the principle of electromagnetic induction, main components are a primary coil, a secondary coil and an iron core, and the transformer has the following main functions: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformer), and the like. The transformer coil constitutes the circuit part of the transformer, which is directly connected to the external network and is the most important component in the transformer.

Coils are generally classified into layer type and pancake type. The coil is characterized in that the wire turns of the coil are continuously wound in layers along the axial direction, each layer is cylindrical, and the coil has good mechanical strength, is not easy to deform and is convenient to wind. A coil composed of two layers is called a double-layer cylinder type, and a coil composed of multiple layers is called a multi-layer cylinder type. After the turns of the coil are continuously wound in the radial direction into a coil cake (wire segment), the coil formed by arranging a plurality of coil cakes in the axial direction is called a cake-type coil. Such as continuous and intertwined coils, are the coil types. In addition to the above two coil forms, the coil interposed between the layer type and the pancake type includes a pancake coil, a foil coil, and the like. The foil winding coil, i.e. the coil is made of copper or aluminum foil winding, is mainly used for medium and small-sized transformers with the capacity less than 2500 kVA. Because the current of the low-voltage coil is generally large, if a plurality of low-voltage coils are wound in parallel, a large spiral angle is generated if a layer winding method is adopted during winding, and when a transformer is short-circuited, a large mechanical force is generated in the vertical direction of the coil, so that the coil is damaged. The end of the copper or aluminum foil is flat, so that the axial force during short circuit is only a fraction of that of the wire-wound structure, and the copper or aluminum foil has stronger short circuit resistance.

At present, the wire winding and foil winding of the transformer coil are mixed, so that the advantages of the wire winding and the foil winding are achieved, but a more effective treatment mode is required to be adopted for insulation. In particular, in foil-wound coils, the conductive foil interlining needs to be insulated by interlayer insulation, and since both ends of the conductive foil cannot be covered by the interlayer insulation, both ends need to be additionally sealed by mixed resin. And the interlayer insulation and the conductive foil are difficult to keep two ends relatively flat in the winding process, the problem of virtual pressure of the end face part exists in the assembling process, the overall appearance quality is influenced, the mechanical strength and the short-circuit resistance of the coil are reduced, and the two ends need to be further subjected to flat cutting or grinding operation.

Therefore, the utility model provides a transformer coil with hem insulation system, the foil that solves current transformer coil is complicated and the loaded down with trivial details technical problem of insulation processing around coil coiling operation, has adopted reasonable coiling and insulation processing according to the different constitutions of coil, and whole structure has obtained fairly simplifying, and insulating security can has obtained the reinforcing, and anti short circuit ability has obtained fine improvement simultaneously, has improved the whole quality and the manufacturing efficiency of product greatly.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the utility model provides a transformer coil with hem insulation system, solves the complicated and loaded down with trivial details technical problem of insulation processing of the foil coil coiling operation of current transformer coil.

In order to achieve the above object, the utility model adopts the following technical scheme:

a transformer coil with a folded edge insulation structure comprises a wire-wound coil and a foil-wound coil which are both in a cylindrical structure, wherein the wire-wound coil is sleeved on the periphery of the foil-wound coil; the wire-wound coil comprises a plurality of layers of wire-wound windings which are mutually attached and distributed at intervals and wire-wound interlayer insulation; the foil-wound coil is formed by winding a first layer of conductive foil, a foil-wound interlayer insulation layer and a second layer of conductive foil which are sequentially attached from inside to outside together, and edge-folded insulation structures used for wrapping the conductive foils are arranged at two ends of the foil-wound interlayer insulation layer.

Further, the wire-wound coil is a multilayered cylindrical structure.

Furthermore, the conducting wire in the wire-wound winding is made of copper or aluminum material; the wire winding interlayer insulation is insulation dispensing paper, and the thickness of the insulation dispensing paper is larger than 0.08 mm.

Furthermore, the first layer of conductive foil and the second layer of conductive foil are both copper foils or aluminum foils, and the thickness of the first layer of conductive foil and the second layer of conductive foil is 0.3-2.6 mm.

Furthermore, the foil winding interlayer insulation is insulating point gummed paper, and the thickness is 0.08-0.25 mm.

Further, the cross-sectional shapes of the wire-wound coil and the foil-wound coil are both oval.

Further, a gap is provided between the wire-wound coil and the foil-wound coil, and the gap is an oil passage of the wire-wound coil.

Furthermore, the edge folding insulation structure is corrugated and comprises at least four layers of insulation folding sheets which are sequentially connected in a bending mode from inside to outside.

Furthermore, the inner layer of the wire-wound coil and the outer layer of the foil-wound coil are both provided with insulating layers, and the insulating layers are insulating paper boards.

Further, the foil winding coil is formed by winding a double-layer foil winding machine.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model has the advantages of simple structure and scientific and reasonable design, convenient to use, the foil winding coil coiling operation of solving current transformer coil is complicated and the loaded down with trivial details technical problem of insulation treatment, has adopted reasonable coiling and insulation treatment according to the different constitutions of coil, and overall structure has obtained fairly simplifying, and insulating security performance has obtained the reinforcing, and anti short circuit capability has obtained fine improvement simultaneously, has improved the whole quality and the manufacturing efficiency of product greatly.

The utility model discloses a wire-wound coil and the foil winding coil that all are tubular structure, foil winding coil periphery is located to wire-wound coil cover. Because wire-wound coil is different with foil-wound coil structure, its coiling is also very different with insulating operation, the utility model discloses the event is handled according to the different structure of the two, and whole coil has obtained the simplification, has strengthened insulating security. Particularly for foil-wound coils, the two ends of the conductive foil cannot be wrapped due to the insulation between foil windings, and the conductive foil is difficult to keep relatively flat during the winding process. Therefore, the utility model discloses a foil has adopted specific hem insulation construction with conducting foil both ends parcel wherein between the insulating both ends of winding layer, has avoided the relative displacement of the two coiling in-process to kept foil winding coil both ends relatively level and smooth, avoided follow-up level and smooth processing, can effectively improve coil coiling efficiency, practice thrift coil coiling equipment cost.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a cross-sectional view of a wire-wound coil.

Fig. 3 is a cross-sectional view of a foil-wound coil.

Fig. 4 is a diagram of the insulating connection between the conductive foil and the foil winding layer.

Fig. 5 is a diagram showing a structure of an insulation between foil layers.

Wherein, the names corresponding to the reference numbers are:

1-wire winding coil, 2-foil winding coil, 3-oil channel, 4-insulating layer, 11-wire winding, 12-wire winding interlayer insulation, 21-first layer of conductive foil, 22-foil winding interlayer insulation, 23-second layer of conductive foil, 24-folded edge insulation structure and 25-insulation folded piece.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but 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, and thus, it should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; of course, mechanical connection and electrical connection are also possible; alternatively, they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

As shown in fig. 1-5, the utility model provides a pair of transformer coil with hem insulation system, simple structure, design scientific and reasonable, convenient to use, the foil winding coil coiling operation of solving current transformer coil is complicated and the loaded down with trivial details technical problem of insulation treatment, reasonable coiling and insulation treatment have been adopted according to the different constitutions of coil, whole structure has obtained fairly simplifying, insulating security can obtain the reinforcing, anti short circuit ability has obtained fine improvement simultaneously, the whole quality and the manufacturing efficiency of product have been improved greatly.

The utility model discloses a wire-wound coil 1 and foil winding coil 2 that all are tubular structure, foil winding coil 2 periphery is located to 1 cover of wire-wound coil. Because the wire-wound coil 1 and the foil-wound coil 2 have different structures and are greatly different in winding and insulating operation, the wire-wound coil and the foil-wound coil are processed according to the different structures of the wire-wound coil and the foil-wound coil, the whole coil is simplified, and the insulating safety is enhanced. Particularly for the foil-wound coil 2, the two ends of the conductive foil cannot be wrapped by the foil-wound interlayer insulation 22, and the conductive foil is difficult to keep relatively flat during the winding process. Therefore, the utility model discloses a foil has adopted specific hem insulation construction 24 with conductive foil both ends parcel wherein between insulating 22 both ends between the layer to the foil winding to avoid the relative displacement of the two coiling in-process to kept 2 both ends of foil winding relatively level and smooth, avoided follow-up leveling, can effectively improve coil coiling efficiency, practice thrift coil coiling equipment cost.

Wire-wound coil 1 includes that the multilayer laminates each other and alternate distribution's wire-wound winding 11 and wire-wound interlayer insulation 12. The wire-wound coil 1 is of a multi-layer cylindrical structure, wire turns of the coil are sequentially arranged in layers along the axial direction and are continuously wound, and the wire-wound coil has the advantages of compact structure, high production efficiency and good impulse voltage resistance. The wire in the wire-wound winding 11 is made of copper or aluminum material; the wire-wound interlayer insulation 12 is made of insulation dispensing paper, is a common insulation material for coil interlayer insulation pads, has good absorptivity and low price, and has a thickness of more than 0.08 mm. In addition, end insulation is also provided between each layer of the wire-wound coil 2.

Foil winding coil 2 is formed by insulating 22 between first layer conducting foil 21, foil winding layer and the common coiling of second floor conducting foil 23 from interior to laminating in proper order outward, foil winding coil 2's the number of turns is less than above-mentioned wire winding coil 1 number of turns, and first layer conducting foil 21 and second floor conducting foil 23 are copper foil or aluminium foil, and thickness is 0.3 ~ 2.6 mm. In the winding process of the foil winding coil 2, the foil winding interlayer insulation 22 is insulation dispensing paper, the insulation dispensing paper comprises cable paper and modified epoxy resin layers on two sides, and the thickness of the insulation dispensing paper is 0.08-0.25 mm.

Foil is all equipped with at 22 both ends of insulating between winding layer and is used for wrapping up the hem insulation construction 24 that conducting foil is corrugated, it includes at least four layers by inside and outside the order bend connect and with conducting foil terminal surface vertically insulation tabs 25. When the folding insulation structure 24 is manufactured, only the two ends of the insulation dispensing paper are required to be firstly folded into a first insulation folding piece 25 along the vertical direction of the paper surface main body, then the two ends of the insulation dispensing paper are oppositely folded into a second insulation folding piece 25 along the first insulation folding piece 25, and a third insulation folding piece 25 and a fourth insulation folding piece 25 can be sequentially folded in the same way, and finally the corrugated shape is formed. The main body of the insulating dispensing paper is foil winding interlayer insulation 22, the corrugated shapes folded at two ends are folding edge insulation structures 24, when the foil winding coil 2 is wound, only two ends of the conductive foil are required to be placed between two insulation folding pieces 25 of the folding edge insulation structures 24, and then the conductive foil and the insulating dispensing paper are fed into the double-layer foil winding machine coil to be wound synchronously.

Wire-

wound coil

1 and 2 cross-sectional shapes of foil-wound coil are oval, and the two uses with oval iron core cooperatees, and oval iron core can realize improving the alternate space of transformer and the whole space utilization of ware body, reduces iron core weight, reduces the no-load loss, can reduce the manufacturing cost of transformer at last. A gap is provided between the wire-wound coil 1 and the foil-wound coil 2, and the gap is an oil passage 3 of the wire-wound coil 1, providing a passage through which oil circulates, and contributing to heat dissipation of the wire-wound coil 1.

1 inlayer of wire-wound coil and 2 skin of foil-wound coil all are equipped with insulating layer 4, and insulating layer 4 is the splendid insulating board of insulating properties.

The utility model discloses used double-deck foil formula coiling machine is current known electrical equipment to all can directly purchase the use on the market, its structure, circuit and control principle are current known technology, consequently, structure, circuit and the control principle about double-deck foil formula coiling machine are not repeated here.

Finally, it should be noted that: the above embodiments are only preferred embodiments of the present invention to illustrate the technical solution of the present invention, but not to limit the same, and certainly not to limit the scope of the present invention; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention; that is, the technical problems solved by the present invention are still consistent with the present invention, and all the modifications or colors made in the spirit and the idea of the main design of the present invention are included in the protection scope of the present invention; in addition, will the technical scheme of the utility model direct or indirect application is in other relevant technical field, all including on the same reason the utility model discloses an in the patent protection scope.

Claims

1. The utility model provides a transformer coil with hem insulation system which characterized in that: the winding device comprises a winding coil (1) and a foil winding coil (2) which are both in a cylindrical structure, wherein the winding coil (1) is sleeved on the periphery of the foil winding coil (2); the wire-wound coil (1) comprises a plurality of layers of wire-wound windings (11) which are mutually attached and distributed at intervals and wire-wound interlayer insulation (12); the foil winding coil (2) is formed by winding a first layer of conductive foil (21), a foil winding interlayer insulation (22) and a second layer of conductive foil (23) which are sequentially attached from inside to outside together, and folding edge insulation structures (24) used for wrapping the conductive foils are arranged at two ends of the foil winding interlayer insulation (22).

2. A transformer coil having a crimped insulation structure according to claim 1, wherein: the wire-wound coil (1) is of a multilayer cylindrical structure.

3. A transformer coil having a crimped insulation structure according to claim 1, wherein: the conducting wire in the wire-wound winding (11) is made of copper or aluminum material; the wire-wound interlayer insulation (12) is insulation dispensing paper, and the thickness of the insulation dispensing paper is larger than 0.08 mm.

4. A transformer coil having a crimped insulation structure according to claim 1, wherein: the first layer of conductive foil (21) and the second layer of conductive foil (23) are both copper foils or aluminum foils, and the thickness is 0.3-2.6 mm.

5. A transformer coil having a crimped insulation structure according to claim 1, wherein: the foil winding interlayer insulation (22) is insulation glue dispensing paper, and the thickness is 0.08-0.25 mm.

6. A transformer coil having a crimped insulation structure according to claim 1, wherein: the cross sections of the wire-wound coil (1) and the foil-wound coil (2) are both oval.

7. A transformer coil having a crimped insulation structure according to claim 1, wherein: a gap is arranged between the wire-wound coil (1) and the foil-wound coil (2), and the gap is an oil passage (3) of the wire-wound coil (1).

8. A transformer coil having a crimped insulation structure according to claim 1, wherein: the folding insulation structure (24) is corrugated and comprises at least four layers of insulation folding sheets (25) which are sequentially connected in a bending way from inside to outside.

9. A transformer coil having a crimped insulation structure according to claim 1, wherein: the inner layer of the wire-wound coil (1) and the outer layer of the foil-wound coil (2) are both provided with insulating layers (4), and the insulating layers (4) are insulating paper boards.

10. A transformer coil having a crimped insulation structure according to claim 1, wherein: the foil winding coil (2) is formed by winding a double-layer foil winding machine.