CN116741508B - Coil connecting device, current coil and manufacturing method thereof - Google Patents

Coil connecting device, current coil and manufacturing method thereof Download PDF

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Publication number
CN116741508B
CN116741508B CN202311013262.7A CN202311013262A CN116741508B CN 116741508 B CN116741508 B CN 116741508B CN 202311013262 A CN202311013262 A CN 202311013262A CN 116741508 B CN116741508 B CN 116741508B
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China
Prior art keywords
positioning
connecting part
piece
positioning groove
transformer
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CN202311013262.7A
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Chinese (zh)
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CN116741508A (en
Inventor
印丽琴
沈莉
王静
朱豆华
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Jiangsu Jingjiang Transformer Co ltd
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Jiangsu Jingjiang Transformer Co ltd
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/303—Clamping coils, windings or parts thereof together
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions
    • H01F2038/305—Constructions with toroidal magnetic core

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Transformers For Measuring Instruments (AREA)

Abstract

The application relates to a coil connection for merging windings. The application also relates to a current coil based on the coil connecting device, a plurality of coil windings are combined into the current coil by using the designed first connecting piece group and the second connecting piece group, and the current coil is fixed in the current transformer by using the supporting piece, so that the hidden quality hazards of short circuit, breakdown and the like are eliminated, and the output capacity and the stability of products are improved. The application also relates to a manufacturing method of the current coil, the number of coil wraps is obtained through calculation, the first connecting piece group and the second connecting piece group are fixed on the iron core of the coil winding by using the yarn belt winding and insulating materials, the winding is more convenient and quick during winding, the current coil is formed after winding and combining, the output capacity of the product is improved, the quality of the current coil is ensured, and the qualification rate and the safety are high during use in the current transformer.

Description

Coil connecting device, current coil and manufacturing method thereof
Technical Field
The application relates to the technical field of power equipment, in particular to a coil connecting device, a current coil and a manufacturing method thereof.
Background
In the transformer industry, combining current coil windings is commonly performed by tightening a plurality of current coil windings with a tightening strap or tightening a plurality of current coil windings with a tightening strap. The current coil windings are combined in the two modes, so that the problems of more operation steps and low speed exist, quality risks exist, such as loosening of the coils when binding and fastening are not in place, and phenomena of out-of-tolerance winding, breakdown of the fixing plate and the coils when binding and fastening are excessive.
When the coil of the bus type current transformer is molded, two schemes of wrapping a fixing piece at the top of the coil or wrapping a supporting piece inside the coil are generally adopted. Because the winding of the coil in the bus type current transformer is longer, when the fixing piece is wrapped at the top of the coil, the scheme is difficult to see the casting layer at the tail part of the coil in the process of die filling, and in the process of operation, if the coil shakes, the casting layer is changed, and primary breakdown is easy to cause; the supporting piece is wrapped in the coil, so that the design scheme of the heights of iron cores in various coils cannot be met, and the product meeting capacity is limited. When the support column type current coil is assembled, two schemes of fixing the whole coil by a fixing plate or wrapping a casting nut on each coil winding are generally adopted. When the coil is fixed by the fixing plate, the secondary winding is easy to break down; and each coil winding is wrapped with a casting nut, so that a shielding layer is additionally arranged on the secondary winding to ensure the qualification rate, the operation difficulty is increased, the distance between the secondary winding and the insulating layer of the primary winding is reduced, the capacity of the product is reduced, and the efficiency of die filling and casting layer adjustment is reduced.
Accordingly, the prior art has drawbacks and needs to be improved and developed.
Disclosure of Invention
The embodiment of the application provides a coil connecting device, a current coil and a manufacturing method thereof, which can solve the technical problems that the conventional current coil has poor merging effect, so that the product meets the requirements of capacity limitation and quality risk.
The embodiment of the application provides a coil connecting device, which is used for combining coils, wherein the coils comprise an iron core, and comprise an insulating first connecting piece and an insulating second connecting piece, the inner side outer contour of one end of the first connecting piece is attached to a first radial surface of the iron core, the inner side outer contour of the other end of the first connecting piece is attached to the circumferential surface of the iron core, the inner side outer contour of one end of the second connecting piece is attached to a second radial surface of the iron core, and the inner side outer contour of the other end of the second connecting piece is attached to the circumferential surface of the iron core; adjacent ones of the arbitrary number of cores are joined in the core axial direction by the snap-fit connection between the first and second connection members.
Further, the first connecting piece comprises a first connecting part and a second connecting part which are perpendicular to each other, a junction is smoothly connected between the first connecting part and the second connecting part, the first connecting part comprises a first positioning groove, the opening end of the first positioning groove faces the junction, and the closed end of the first positioning groove is positioned on the first connecting part; the second connecting part comprises at least two second positioning grooves, the opening ends of the second positioning grooves are positioned at the edges of the second connecting part, and the closing ends of the second positioning grooves are positioned on the second connecting part;
The second connecting piece comprises a third connecting part and a fourth connecting part which are perpendicular to each other, the third connecting part comprises a third positioning groove and a first positioning bolt, the third positioning groove is positioned on the third connecting part, and the first positioning bolt slides in the third positioning groove; the fourth connecting part comprises at least two fourth positioning grooves, the opening ends of the fourth positioning grooves are positioned at the outer edge of the fourth connecting part, and the closed ends of the fourth positioning grooves are positioned on the fourth connecting part;
the first connecting piece with the second connecting piece is connected with the block of first constant head tank through first constant head tank, the second constant head tank or the block of fourth constant head tank is gone up to have at least one support piece.
The embodiment of the application also provides a current coil based on the coil connecting device, the current coil is fixed in a transformer die and comprises an iron core, at least one group of insulated first connecting piece groups are arranged on the first radial surface of the iron core, each group of first connecting piece groups comprises two first connecting pieces arranged at the two ends of the same diameter of the first radial surface, each first connecting piece comprises a first connecting part and a second connecting part, the inner side outer contour of each first connecting part is attached to the first radial surface, and the inner side outer contour of each second connecting part is attached to the circumferential surface;
The second radial surface of the iron core is provided with insulating second connecting piece groups, the number of the insulating second connecting piece groups is the same as that of the first connecting piece groups, each second connecting piece group comprises two second connecting pieces which are arranged at two ends of the same diameter of the second radial surface, each second connecting piece comprises a third connecting part and a fourth connecting part, the inner side outer contour of the third connecting part is attached to the second radial surface, and the inner side outer contour of the fourth connecting part is attached to the circumferential surface;
the transformer die is internally provided with at least two coaxial iron cores, adjacent iron cores in any number of iron cores are mutually clamped with the third connecting part through the first connecting part, at least one insulating supporting piece is clamped on the second connecting part or the fourth connecting part, the iron cores are fixed in the transformer die through the supporting piece, one end of each supporting piece is clamped on any one of the second connecting part or the fourth connecting part, and the other end of each supporting piece is fixed on the transformer die.
Further, the first connecting portion and the second connecting portion are perpendicular to each other, a junction is smoothly connected between the first connecting portion and the second connecting portion, the first connecting portion comprises a first positioning groove, an opening end of the first positioning groove faces the junction, and a closed end of the first positioning groove is located on the first connecting portion; the second connecting part comprises at least two second positioning grooves, the opening ends of the second positioning grooves are positioned at the edges of the second connecting part, and the closing ends of the second positioning grooves are positioned on the second connecting part;
The third connecting part and the fourth connecting part are mutually perpendicular, the third connecting part comprises a third positioning groove and a first positioning bolt, the third positioning groove is positioned on the third connecting part, and the first positioning bolt slides in the third positioning groove; the fourth connecting part comprises at least two fourth positioning grooves, the opening ends of the fourth positioning grooves are positioned at the outer edge of the fourth connecting part, and the closed ends of the fourth positioning grooves are positioned on the fourth connecting part;
the transformer die is internally provided with at least two coaxial iron cores, adjacent iron cores in any number of iron cores are mutually clamped with the first positioning grooves through the first positioning bolts, at least one insulating supporting piece is clamped on the second positioning grooves or the fourth positioning grooves, the iron cores are fixed in the transformer die through the supporting piece, one end of each supporting piece is clamped in any one of the second positioning grooves or the fourth positioning grooves, and the other end of each supporting piece is fixed on the transformer die.
Further, insulating fixing pieces are arranged on the second connecting portion and the fourth connecting portion, and the fixing pieces are attached to the second connecting portion and used for pressing the second connecting portion on the circumferential surface of the iron core; the fixing piece is attached to the fourth connecting portion and used for pressing the fourth connecting portion to the circumferential surface of the iron core.
Further, the fixing piece is a magnetic fixing piece, and the second connecting part is pressed on the circumferential surface through the magnetic attraction between the fixing piece and the iron core; the fourth connecting part is pressed on the circumferential surface through the magnetic attraction force of the fixing piece and the iron core.
Further, when the transformer die is a bus type current transformer die, a protruding part protrudes outwards from the transformer die, a first positioning hole is formed in the protruding part, the axis of the first positioning hole is perpendicular to the bottom surface of the transformer die, the axis of the iron core is perpendicular to the bottom surface of the transformer die, adjacent iron cores in any number are clamped with the first positioning groove through the first positioning pin, at least one insulating supporting part is clamped on the second positioning groove or the fourth positioning groove, the iron core is fixed in the transformer die through the supporting part, the supporting part is a supporting piece, one end of the supporting part is provided with a second positioning pin, the second positioning pin is clamped in any one of the second positioning grooves or the fourth positioning groove, the other end of the supporting part is provided with a U-shaped notch matched with the diameter of the first positioning hole, and the U-shaped notch is clamped with the wall of the first positioning hole.
Further, when the transformer die is a pillar type current transformer die, the top of the transformer die is a cover plate, a second positioning hole is formed in the cover plate, the axis of the iron core is parallel to the bottom surface of the transformer die, adjacent iron cores in any number of iron cores are mutually clamped with the first positioning groove through the first positioning bolt, at least one insulating supporting piece is clamped on the second positioning groove or the fourth positioning groove, the iron cores are fixed in the transformer die through the supporting piece, the supporting piece is a screw, one end of the supporting piece is provided with a third positioning bolt, the screw penetrates through the second positioning hole and clamps the third positioning bolt in any one of the second positioning grooves or the fourth positioning groove, and the other end of the supporting piece is a screw head which is tightly pressed on the cover plate and covers the second positioning hole.
Further, a card is arranged on the cover plate, at least one screw positioning groove is formed in the screw, the card is provided with a notch matched with the shape of the screw positioning groove, the screw penetrates through the second positioning hole and clamps the third positioning bolt in any one of the second positioning groove or the fourth positioning groove, and the screw clamps the screw positioning groove through the notch of the card to fix the screw head on the cover plate.
The embodiment of the application also provides a manufacturing method based on the current coil, which comprises the following steps:
step one: at least one group of insulating first connecting piece groups are arranged on the first radial surface of the iron core, two first connecting pieces in each group of first connecting piece groups are arranged at two ends of the same diameter of the first radial surface, the inner side outer contour of a first connecting part of each first connecting piece is attached to the first radial surface, and the inner side outer contour of each second connecting part is attached to the circumferential surface of the iron core;
mounting insulating second connector groups with the same number as the first connector groups on a second radial surface of the iron core, wherein two second connectors in each second connector group are mounted at two ends with the same diameter on the second radial surface, the inner side outer contour of a third connecting part of the second connectors is attached to the second radial surface, and the inner side outer contour of a fourth connecting part of the second connectors is attached to the circumferential surface of the iron core;
step two: winding the iron core with a yarn band in a ring shape by taking any position of the iron core as a starting end, and covering Zhou Sha band width on each ring-shaped wound yarn band by at least 1/2; wrapping insulating materials after annular winding, wherein the surfaces of the first connecting piece group and the second connecting piece group are completely exposed during wrapping, and sealing treatment is performed by using an insulating electrical tape after wrapping;
Step three: selecting ampere turns according to the product requirement, calculating the quotient of the ampere turns and the secondary current to obtain the number of turns of the secondary winding, setting an iron core size parameter and a secondary number of turns parameter on a winding machine, and carrying out coil winding on the iron core to obtain a coil winding;
step four: combining adjacent ones of the coil windings into a current coil through the first connector set and the second connector set; the first connecting part comprises a first positioning groove, the second connecting part comprises at least two second positioning grooves, the third connecting part comprises a third positioning groove and a first positioning bolt, the fourth connecting part comprises at least two fourth positioning grooves, and at least one insulating supporting piece is clamped on the second positioning groove or the fourth positioning grooves; the first positioning bolts and the first positioning grooves are mutually clamped to be used for combining adjacent iron cores in any number of iron cores, one end of the supporting piece is clamped in any one of the second positioning grooves or the fourth positioning grooves, and the other end of the supporting piece is fixed on a transformer die and used for fixing the current coil in the transformer die;
Step five: and after the combination is finished, welding the inserts, checking the current coils, and sending the current coils to a die filling process after the current coils are checked to be qualified.
Further, when the transformer die is a bus type current transformer, the fourth step includes:
the transformer die is provided with a convex part in an outward protruding mode, the convex part is provided with a first positioning hole, the axis of the first positioning hole is perpendicular to the bottom surface of the transformer die, the axis of the iron core is perpendicular to the bottom surface of the transformer die, at least one insulating supporting piece is clamped on the second positioning groove or the fourth positioning groove, the supporting piece is a supporting piece, one end of the supporting piece is provided with a second positioning bolt, and the other end of the supporting piece is provided with a U-shaped notch matched with the diameter of the first positioning hole;
and using the first positioning bolt to clamp adjacent iron cores with the first positioning groove, clamping the second positioning bolt in any one of the second positioning groove or the fourth positioning groove, clamping the U-shaped notch on the hole wall of the first positioning hole, and fixing the iron cores in the transformer die.
Further, when the transformer mold is a pillar type current transformer, the fourth step includes:
The top of the transformer die is a cover plate, a second positioning hole is formed in the cover plate, the axis of the iron core is parallel to the bottom surface of the transformer die, at least one insulating support piece is clamped on the second positioning groove or the fourth positioning groove, the support piece is a screw, one end of the support piece is provided with a third positioning bolt, and the other end of the support piece is a screw head;
and using the first positioning bolt to clamp adjacent iron cores with the first positioning groove, enabling the screw to pass through the second positioning hole, enabling the third positioning bolt to be clamped in any one of the second positioning groove or the fourth positioning groove, tightly pressing the screw head on the cover plate and covering the second positioning hole, and fixing the iron cores in the transformer die.
The beneficial effects are that:
according to the technical scheme, the coil connecting device is convenient and stable to connect by connecting the plurality of coil windings with the second connecting piece through the first connecting piece. The invention also provides a current coil based on the coil connecting device, and the clamping of the first connecting piece group and the second connecting piece group is utilized to combine a plurality of coil windings together, so that the operation is simple and convenient, the working efficiency is improved, the hidden quality hazards such as breakdown and short circuit are eliminated, and the product quality is ensured. And the second connecting part on the first connecting piece group and the fourth connecting part on the second connecting piece group are provided with insulating fixing pieces, so that the first connecting piece group and the second connecting piece group are fastened, and the combination stability of the coil windings is ensured. The first connecting piece group and the second connecting piece group related by the invention can adapt to different transformer moulds, and the applicability of the combined coil winding is improved. And each connecting component is sleeved by using a high-temperature-resistant insulating silica gel sleeve, so that the coil winding is prevented from being influenced by factors such as short circuit, high temperature and the like. The invention also provides a manufacturing method of the current coil, when a plurality of coil windings are needed to be used, the first connecting piece group and the second connecting piece are utilized to combine adjacent coil windings, and the combined coil can be stabilized in the transformer die. Different methods are provided for different transformer molds, the combined coil products are good in quality, coils of any product grade can be combined at will, the output capacity of the products is improved, and the appearance of the products is guaranteed.
It should be understood that all combinations of the foregoing concepts, as well as additional concepts described in more detail below, may be considered a part of the inventive subject matter of the present disclosure as long as such concepts are not mutually inconsistent.
The foregoing and other aspects, embodiments, and features of the present teachings will be more fully understood from the following description, taken together with the accompanying drawings. Other additional aspects of the application, such as features and/or advantages of the exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of the embodiments according to the teachings of the application.
Drawings
The drawings are not intended to be drawn to scale with respect to true references. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the application will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a single coil winding diagram of a current coil according to an embodiment of the present application.
Fig. 2 is a front view of a first connector of a current coil according to an embodiment of the present application.
Fig. 3 is a right side view of a first connection member of a current coil according to an embodiment of the present application.
Fig. 4 is a top view of a first connection member of a current coil according to an embodiment of the present application rotated 90 ° counterclockwise.
Fig. 5 is a front view of a second connector of a current coil according to an embodiment of the present application.
Fig. 6 is a right side view of a second connection member of a current coil according to an embodiment of the present application.
Fig. 7 is a top view of a second connection member of a current coil according to an embodiment of the present application rotated 90 ° counterclockwise.
Fig. 8 is a combination diagram of a plurality of coil windings of a current coil according to an embodiment of the present application.
Fig. 9 is a schematic diagram of a current coil in a bus-type current transformer according to an embodiment of the present application.
Fig. 10 is a schematic structural diagram of a support sheet of a current coil according to an embodiment of the present application.
Fig. 11 is a schematic diagram of a current coil in a branch current transformer according to an embodiment of the present application.
Fig. 12 is a schematic diagram of a screw structure of a current coil according to an embodiment of the present application.
Fig. 13 is a schematic structural diagram of a fixing member of a current coil according to an embodiment of the present application.
Reference numerals illustrate:
1-a first connector; 101-a first connection; 1011-first positioning groove; 102-a second connection; 1021-a second positioning slot; 2-a second connector; 201-a third connection; 2011-a third positioning groove; 2012-a first positioning peg; 202-fourth connection; 2021-fourth positioning grooves; 3-fixing parts; 401-supporting sheets; 4011-a second locating peg; 402-screws; 4021-a third positioning pin; 4022-a screw detent; 5-a transformer die; 501-a first positioning hole; 502-a second positioning hole; 503-card; 6-iron core.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Also, unless the context clearly indicates otherwise, singular forms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "comprises," "comprising," or the like are intended to cover a feature, integer, step, operation, element, and/or component recited as being present in the element or article that "comprises" or "comprising" does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. "up", "down", "left", "right" and the like are used only to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed accordingly.
In the transformer industry, combining current coil windings is commonly performed by tightening a plurality of current coil windings with a tightening strap or tightening a plurality of current coil windings with a tightening strap. The current coil windings are combined in the two modes, so that the problems of more operation steps and low speed exist, quality risks exist, such as loosening of the coils when binding and fastening are not in place, and phenomena of out-of-tolerance winding, breakdown of the fixing plate and the coils when binding and fastening are excessive.
In view of this, the present invention provides a coil connecting device for merging coils, the coil including an iron core 6, the coil connecting device including an insulating first connecting member 1 and an insulating second connecting member 2, an inner outer contour of one end of the first connecting member 1 being fitted to a first radial surface of the iron core 6, an inner outer contour of the other end of the first connecting member 1 being fitted to a circumferential surface of the iron core 6, an inner outer contour of one end of the second connecting member 2 being fitted to a second radial surface of the iron core 6, an inner outer contour of the other end of the second connecting member 2 being fitted to a circumferential surface of the iron core 6; adjacent ones of the cores 6 of any number of cores 6 are joined together in the axial direction of the cores 6 by the snap-fit connection between the first and second connectors 1, 2.
With reference to fig. 1 and 8, the first connector 1 and the second connector 2 are attached to the core 6, and the core 6 is in a cylindrical shape, and includes two radial surfaces parallel to each other and a circumferential surface located between the two radial surfaces, and the two radial surfaces are respectively named as a first radial surface and a second radial surface. The plurality of iron cores 6 are stably connected through the clamping of the first connecting piece 1 and the second connecting piece 2, are firmly fixed, do not shake, and therefore do not cause breakdown.
In some embodiments, the first connecting piece 1 includes a first connecting portion 101 and a second connecting portion 102 perpendicular to each other, a junction is smoothly connected between the first connecting portion 101 and the second connecting portion 102, the first connecting portion 101 includes a first positioning slot 1011, an opening end of the first positioning slot 1011 faces the junction, and a closed end of the first positioning slot 1011 is located on the first connecting portion 101; the second connecting portion 102 includes at least two second positioning slots 1021, an opening end of each second positioning slot 1021 is located at an edge of the second connecting portion 102, and a closed end of each second positioning slot 1021 is located on the second connecting portion 102;
the second connecting piece 2 comprises a third connecting part 201 and a fourth connecting part 202 which are perpendicular to each other, the third connecting part 201 comprises a third positioning groove 2011 and a first positioning bolt 2012, the third positioning groove 2011 is positioned on the third connecting part 201, and the first positioning bolt 2012 slides in the third positioning groove 2011; the fourth connecting portion 202 includes at least two fourth positioning grooves 2021, an open end of the fourth positioning groove 2021 is located at an outer edge of the fourth connecting portion 202, and a closed end of the fourth positioning groove 2021 is located on the fourth connecting portion 202;
the first connector 1 and the second connector 2 are connected with the first positioning groove 1011 through the first positioning bolt 2012, and at least one supporting piece is clamped on the second positioning groove 1021 or the fourth positioning groove 2021.
Wherein, a first connecting piece 1 is installed on a first radial surface of one iron core 6, a second connecting piece 2 is installed on a second radial surface, and after installation, a single current coil is formed through processes of winding and the like, because the first connecting piece 1 and the second connecting piece 2 are used for combining a plurality of coil windings, the first connecting piece 1 and the second connecting piece 2 are exposed outside after winding, the iron cores 6 in adjacent coil windings are connected with the clamping of a first positioning slot 1011 through a first positioning bolt 2012, and the current coils are formed through combination. The current coil passes through support piece one end block in first connecting piece 1 or second connecting piece 2, realizes with the fixed of iron core 6, and the other end is fixed with transformer mould 5 for current coil does not produce to rock in transformer mould 5 inside, prevents to take place to break down.
The invention also provides a current coil based on the coil connecting device, which is fixed in the transformer die 5 and comprises an iron core 6. At least one group of insulating first connecting piece groups are arranged on the first radial surface of the iron core 6, each group of first connecting piece groups comprises two first connecting pieces 1 arranged at two ends of the same diameter of the first radial surface, each first connecting piece 1 comprises a first connecting part 101 and a second connecting part 102, the inner side outer contour of the first connecting part 101 is attached to the first radial surface, and the inner side outer contour of the second connecting part 102 is attached to the circumferential surface.
The second radial surface of the iron core 6 is provided with insulating second connecting piece groups, the number of the insulating second connecting piece groups is the same as that of the first connecting piece groups, each second connecting piece group comprises two second connecting pieces 2 which are arranged at two ends of the same diameter of the second radial surface, each second connecting piece 2 comprises a third connecting part 201 and a fourth connecting part 202, the inner side outer contour of the third connecting part 201 is attached to the second radial surface, and the inner side outer contour of the fourth connecting part 202 is attached to the circumferential surface.
At least two coaxial iron cores 6 are arranged in the transformer die 5, adjacent iron cores 6 in any number of iron cores 6 are mutually clamped with a third connecting part through a first connecting part, at least one insulating supporting piece is clamped on a second connecting part or a fourth connecting part, the iron cores 6 are fixed in the transformer die 5 through the supporting piece, one end of the supporting piece is clamped on any second connecting part or fourth connecting part, and the other end of the supporting piece is fixed on the transformer die 5.
The iron core 6 is in a circular cylindrical shape and comprises a first radial surface and a second radial surface which are parallel to each other and a circumferential surface positioned between the first radial surface and the second radial surface. The first connecting portion is attached to the first radial surface, the third connecting portion is attached to the second radial surface, and the plurality of iron cores 6 are connected together in a coaxial manner by means of engagement of the first connecting portion and the third connecting portion, so that a current coil is formed. The second connecting portion and the fourth connecting portion are attached to the circumferential surface of the iron core 6, one end of the supporting piece is clamped with the second connecting portion or the fourth connecting portion, the other end of the supporting piece is fixed with the transformer die 5, and fixing of the current coil is achieved. In addition, in order to fix more firmly, the support piece can also be connected simultaneously except for selecting one of the second connecting part or the fourth connecting part, and the fixing effect is better. And meanwhile, the number of the clamping parts of the supporting parts and the second connecting part or the fourth connecting part is at least 1, and the plurality of supporting parts are clamped on the second connecting part or the fourth connecting part, so that the fixing effect is improved.
In some embodiments, the first connecting portion and the second connecting portion are perpendicular to each other, a junction is smoothly connected between the first connecting portion and the second connecting portion, the first connecting portion includes a first positioning slot 1011, an opening end of the first positioning slot 1011 faces the junction, and a closed end of the first positioning slot 1011 is located on the first connecting portion; the second connecting part comprises at least two second positioning grooves 1021, the opening ends of the second positioning grooves 1021 are positioned at the edges of the second connecting part, and the closing ends of the second positioning grooves 1021 are positioned on the second connecting part;
the third connecting part and the fourth connecting part are mutually perpendicular, the third connecting part comprises a third positioning groove 2011 and a first positioning bolt 2012, the third positioning groove 2011 is positioned on the third connecting part, and the first positioning bolt 2012 slides in the third positioning groove 2011; the fourth connecting portion includes at least two fourth positioning grooves 2021, an opening end of the fourth positioning groove 2021 is located at an outer edge of the fourth connecting portion, and a closed end of the fourth positioning groove 2021 is located on the fourth connecting portion;
at least two coaxial iron cores 6 are arranged in the transformer die 5, adjacent iron cores 6 in any number of iron cores 6 are mutually clamped with the first positioning groove 1011 through the first positioning bolts 2012, at least one insulating supporting piece is clamped on the second positioning groove 1021 or the fourth positioning groove 2021, the iron cores 6 are fixed in the transformer die 5 through the supporting piece, one end of the supporting piece is clamped in any one of the second positioning groove 1021 or the fourth positioning groove 2021, and the other end of the supporting piece is fixed on the transformer die 5.
Wherein, referring to fig. 1, the current coil can be split into independent coil windings, referring to fig. 8, the current coil can also be composed of two coil windings in combination, and in addition, the current coil can also be composed of at least three coil windings in combination. When the current coil is formed by combining at least two coil windings, the iron cores 6 of the coil windings in the current coil are coaxially arranged, and in the coil windings which are coaxially arranged, adjacent coil windings are mutually clamped with the first positioning groove 1011 through the first positioning bolt 2012, and referring to fig. 4, the first positioning groove 1011 is provided with an open end and a closed end, a certain included angle is formed between the open end and the closed end, the included angle is not 180 degrees, the open end is used for the first positioning bolt 2012 to enter, the closed end is used for realizing fixation after the first positioning bolt 2012 enters, and the first positioning bolt 2012 is not easy to fall off after entering the closed end due to a certain included angle between the open end and the closed end. Referring to fig. 1 or 8, two first connectors 1 in the first connector group are arranged in mirror symmetry with any axial surface of the iron core 6, the two first connectors 1 in the first connector group are positioned at two ends with the same diameter on the first radial surface, the first connectors 1 are arranged at the positions, the elastic forces of the two first connectors 1 in the first connector group, which are received by the iron core 6, are the same, and the directions are opposite, so that the iron core 6 can be better fixed. Referring to fig. 1 or 8, the first connection member 1 is designed such that the first connection portion 101 is located on the first radial surface, and the second connection portion 102 extends from the first radial surface to the curved side surface of the core 6 along the first connection portion 101, thereby fixing the first radial surface of the core 6 together with the curved side surface. In addition, referring to fig. 3, the second connecting portion 102 further includes at least two second positioning slots 1021, the second positioning slots 1021 have an open end and a closed end, a certain included angle is formed between the open end and the closed end, the included angle is a non-180 ° included angle, the open end is used for the entrance of a supporting piece, the closed end is used for realizing fixation after the supporting piece enters, and since the open end and the closed end have a certain included angle, the supporting piece is not easy to fall off after entering the closed end, and since at least two second positioning slots 1021 are provided, each second positioning slot 1021 corresponds to a fixing position of one supporting piece, at one end of the supporting piece connected with the transformer mold 5, the supporting piece is directly fixed on the transformer mold 5 or a structure matched with the supporting piece is arranged on the transformer mold 5 for fixing the supporting piece, the supporting piece is matched with different transformer molds 5 through different second positioning slots 1021 or is connected with the transformer mold 5 and the current coil through installing a plurality of supporting pieces, and further achieving a better supporting effect. Referring to fig. 2, the first connector 1 is designed such that the first connecting portion 101 is attached to the first radial surface of the core 6, the second connecting portion 102 is attached to the curved side surface of the core 6, and a vertical state is formed between the first connecting portion 101 and the second connecting portion 102, so that the attachment degree with the core 6 is higher, the effect of fixing the core 6 is better, and the manner of attaching the first connector 1 to the core 6 is bonding, electrical tape binding or using a magnet material as one of the first connectors 1.
Similarly, since the second connectors 2 in the second connector group mounted on the second radial surface of the core 6 are in one-to-one correspondence with the first connectors 1 in the first connector group, the positions and arrangement manners of the two second connectors 2 in the second connector group are in one-to-one correspondence with the first connectors 1, and are positioned on the same straight line parallel to the axis of the core 6, so that the core 6 can be stably fixed, with reference to fig. 1 or 8. Because the adjacent coil windings are mutually clamped with the first positioning groove 1011 through the first positioning bolt 2012, referring to fig. 5 or 7, the first positioning bolt 2012 enters from the opening end of the first positioning groove 1011 and is fixed at the closed end of the first positioning groove 1011 after entering, and a certain included angle is formed between the opening end and the closed end of the first positioning groove 1011, the first positioning bolt 2012 is not easy to fall off after entering the closed end, in addition, the third connecting part 201 comprises the third positioning groove 2011 and the first positioning bolt 2012, and the first positioning bolt 2012 can be positioned at any position in the third positioning groove 2011 so as to adapt to the connection between the iron cores of different sizes. Referring to fig. 1 or 8, two second connectors 2 in the second connector group are arranged in mirror symmetry with any axial plane of the iron core 6, the two second connectors 2 in the second connector group are positioned at two ends with the same diameter on the second radial surface, the second connectors 2 are arranged at the positions, the two second connectors 2 in the second connector group are subjected to the same elastic force of the iron core 6, and the directions are opposite, so that the iron core 6 can be better fixed. Referring to fig. 1 or 8, the second connecting member 2 is designed such that the third connecting portion 201 is located on the second radial surface, and the fourth connecting portion 202 extends from the second radial surface to the circumferential surface of the core 6 along the second connecting portion 102, thereby fixing the second radial surface and the circumferential surface of the core 6 at the same time. In addition, referring to fig. 6, the fourth connecting portion 202 includes at least two fourth positioning grooves 2021, the fourth positioning grooves 2021 have an open end and a closed end, an included angle is formed between the open end and the closed end, the included angle is not 180 ° and is used for the entrance of a supporting piece, the closed end is used for fixing after the supporting piece enters, the supporting piece is not easy to fall off after entering the closed end due to the included angle formed between the open end and the closed end, and each fourth positioning groove 2021 corresponds to a fixing position of one supporting piece, at one end of the supporting piece connected with the transformer mold 5, the supporting piece is directly fixed on the transformer mold 5 or a structure matched with the supporting piece is arranged on the transformer mold 5, and different fourth positioning grooves 2021 can be matched with different transformer molds 5 or can be connected with the transformer mold 5 by installing a plurality of supporting pieces so as to achieve better supporting effect. Referring to fig. 5, the second connector 2 is designed such that the third connecting portion 201 is attached to the first radial surface of the core 6, the fourth connecting portion 202 is attached to the circumferential surface of the core 6, and a vertical state is formed between the third connecting portion 201 and the fourth connecting portion 202, so that the attachment degree with the core 6 is higher, the effect of fixing the core 6 is better, and the manner of attaching the second connector 2 to the core 6 is one of bonding, electrical tape binding, and using a magnet material as the second connector 2.
In addition, the first connecting piece 1 and the second connecting piece 2 are insulating pieces, and play a role in preventing short circuit in use of the current coil.
In some embodiments, the second connecting portion 102 and the fourth connecting portion 202 are provided with insulating fixing pieces 3, and the fixing pieces 3 are tightly attached to the second connecting portion 102 and used for pressing the second connecting portion 102 to the circumferential surface of the iron core 6; the fixing member 3 is tightly attached to the fourth connecting portion 202, and is used to press the fourth connecting portion 202 against the circumferential surface of the core 6.
Referring to fig. 9, 11 and 13, the fixing member 3 presses the second connecting portion 102 and the fourth connecting portion 202 respectively, so that the first connecting member 1 and the second connecting member 2 are more stably fixed during winding, thereby facilitating subsequent winding. The shape of the fixing member 3 is the shape of the fitting iron core 6, when the iron core 6 is in a cylindrical shape, the shape of the fixing member 3 is arc-shaped, and when the fixing member 3 respectively presses the second connecting portion 102 and the fourth connecting portion 202 and then winds, the second connecting portion 102 and the fourth connecting portion 202 can be better pressed on the iron core 6.
In some embodiments, the fixing member 3 is a magnetic fixing member, and the second connecting portion 102 is pressed on the circumferential surface by the magnetic attraction between the fixing member 3 and the core 6; the fourth connecting portion 202 is pressed against the circumferential surface by the magnetic attraction force of the fixing member 3 and the core 6.
Since the iron core 6 itself can generate magnetic attraction force with the magnet, the fixing member 3 can be designed as a magnet, and the second connecting portion 102 and the fourth connecting portion 202 can be pressed against each other by the magnetic attraction force, so that the second connecting portion 102 and the fourth connecting portion 202 can be pressed against the iron core 6 better during winding.
In some embodiments, when the transformer die 5 is a busbar type current transformer die, a protruding member protrudes outwards from the transformer die 5, a first positioning hole 501 is formed in the protruding member, an axis of the first positioning hole 501 is perpendicular to a bottom surface of the transformer die 5, an axis of the iron core 6 is perpendicular to the bottom surface of the transformer die 5, adjacent iron cores 6 in any number of iron cores 6 are mutually clamped with the first positioning slot 1011 through a first positioning bolt 2012, at least one insulating supporting member is clamped on the second positioning slot 1021 or the fourth positioning slot 2021, the iron cores 6 are fixed in the transformer die 5 through the supporting member, the supporting member is a supporting sheet 401, one end of the supporting member is provided with a second positioning bolt 4011, the second positioning bolt 4011 is clamped in any one of the second positioning slots 1021 or the fourth positioning slot 2021, and the other end of the supporting member is provided with a U-shaped notch matched with the diameter of the first positioning hole 501, and the U-shaped notch is clamped with a hole wall of the first positioning hole 501.
Referring to fig. 9, in the bus bar type current transformer, when the bus bar type current transformer is placed on the ground, the bottom surface of the bus bar type current transformer is placed on the ground, the bottom side surface of the bus bar type current transformer is perpendicular to the ground, at this time, the axis of the current coil is perpendicular to the ground, a convex part protrudes outwards on the side surface of the bus bar type current transformer mold 5, the position of the convex part is set in the range that the second positioning groove 1021 or the fourth positioning groove 2021 is projected onto the side surface of the bus bar type current transformer mold, and the axis of the first positioning hole 501 in the convex part is perpendicular to the bottom surface of the transformer mold 5, so that the convex part is convenient to be connected with the support part. When the plurality of coil windings are combined to form a current coil, the current coil is provided with a plurality of second positioning grooves 1021 or fourth positioning grooves 2021, preferably, the second positioning grooves 1021 or the fourth positioning grooves 2021 positioned at the middle height of the current coil are selected to be connected with the supporting piece, and at the moment, the current coil is decomposed by the upward supporting force provided by the supporting piece under the downward force of the self gravity. In the bus-type current transformer, referring to fig. 10, the support member is a support sheet 401, one end of the support member is a second positioning bolt 4011, and the support member is connected with the current coil by being clamped in any one of the second positioning groove 1021 or the fourth positioning groove 2021 by the second positioning bolt 4011 and being clamped in a closed end in the second positioning groove 1021 or a closed end in the fourth positioning groove 2021; the other end of the supporting piece is provided with a U-shaped notch matched with the diameter of the first positioning hole 501, the U-shaped notch is clamped with the hole wall of the first positioning hole 501, and after clamping, a step surface is naturally formed due to the fact that the convex piece protrudes outwards and is used for supporting one end of the U-shaped notch of the supporting piece 401, and the supporting piece is connected with the busbar type current transformer die. The fixing effect is best when the support 401 is located at the most middle position in the length direction of the busbar type current transformer die to fix the current coil. The current coil and the transformer die 5 are fixed by the supporting plate 401, so that the current coil is not easy to shake and cannot break down.
In some embodiments, when the transformer die 5 is a pillar type current transformer die, the top of the transformer die 5 is a cover plate, a second positioning hole 502 is formed in the cover plate, the axis of the iron core 6 is parallel to the bottom surface of the transformer die 5, adjacent iron cores 6 in any number of iron cores 6 are mutually clamped with the first positioning groove 1011 through the first positioning bolt 2012, at least one insulating supporting piece is clamped on the second positioning groove 1021 or the fourth positioning groove 2021, the iron cores 6 are fixed in the transformer die 5 through the supporting piece, the supporting piece is a screw 402, one end of the supporting piece is provided with a third positioning bolt 4021, the screw 402 penetrates through the second positioning hole 502 and is clamped in any one of the second positioning grooves 1021 or the fourth positioning groove 2021, and the other end of the supporting piece is a screw head which is pressed on the cover plate and covers the second positioning hole 502.
In the pillar type current transformer, referring to fig. 11, when the pillar type current transformer is placed on the ground, the bottom surface of the pillar type current transformer is placed on the ground, the bottom side surface of the pillar type current transformer is perpendicular to the ground, and the axis of the current coil is parallel to the ground. A second locating hole 502 on the cover plate at the top of the pillar type current transformer is used for connecting the current coil with the transformer die 5 by the supporting piece. Referring to fig. 12, at this time, the support is a screw 402, one end of the screw 402 is a third positioning bolt 4021, and the support is connected to the current coil by the third positioning bolt 4021 being engaged in any one of the second positioning groove 1021 or the fourth positioning groove 2021 and being engaged in a closed end in the second positioning groove 1021 or a closed end in the fourth positioning groove 2021; the other end of the screw 402 is a screw head, the screw head is covered on the second positioning hole 502, and the coverage area is larger than the hole surface area of the second positioning hole 502, so that the screw 402 can fix the current coil and the transformer die 5, the current coil is not easy to shake, and no breakdown phenomenon occurs.
In some embodiments, a card 503 is disposed on the cover plate, at least one screw positioning groove 4022 is disposed on the screw 402, the card 503 has a notch matching the shape of the screw positioning groove 4022, the screw 402 passes through the second positioning hole 502 and engages the third positioning bolt 4021 in any one of the second positioning groove 1021 or the fourth positioning groove 2021, and the screw 402 engages the screw positioning groove 4022 through the notch of the card 503 to fix the screw head on the cover plate.
Referring to fig. 12, in order to adapt to iron cores 6 of different sizes, a plurality of screw positioning grooves 4022 are provided on a screw 402, and a card 503 is disposed on a cover plate, when the size of the iron core 6 is large, a third positioning bolt 4021 of the screw 402 is engaged in any one of the second positioning grooves 1021 or the fourth positioning groove 2021, a screw head cannot cover the second positioning hole 502, the card 503 has a notch matching the shape of the screw positioning groove 4022, the notch of the card 503 is engaged in the screw positioning groove 4022, the card 503 is attached to the cover plate, the card 503 can fix the screw 402, and at this time, the card 503 is engaged in the screw positioning groove 4022 of a proper height to cover the second positioning hole 502, thereby fixing the current coil and the transformer die 5.
In some embodiments, the first connecting piece 1, the second connecting piece 2 and the supporting piece are insulated in such a way that at least one layer of high-temperature resistant insulating silica gel sleeve is sleeved on the peripheries of the first connecting piece 1, the second connecting piece 2 and the supporting piece.
Because the current transformer generates high temperature during use, in order to prevent the first connecting piece 1, the second connecting piece 2 and the supporting piece from being melted at high temperature, at least one layer of high temperature resistant insulating silica gel sleeve is sleeved on the peripheries of the first connecting piece 1, the second connecting piece 2 and the supporting piece, and the sleeving mode is to completely cover the parts which are not exposed. In addition, in order to prevent short circuit and avoid breakdown, the high temperature resistant silica gel sleeve sleeved on the peripheries of the first connecting piece 1, the second connecting piece 2 and the supporting piece is required to have an insulating effect, so that the high temperature resistant insulating silica gel sleeve is selected to protect the first connecting piece 1, the second connecting piece 2 and the supporting piece, and the current transformer is enabled to stably run.
The invention also provides a manufacturing method based on the current coil, which comprises the following steps:
step one: at least one group of insulating first connecting piece groups are arranged on the first radial surface of the iron core 6, two first connecting pieces 1 in each group of first connecting piece groups are arranged at two ends of the same diameter of the first radial surface, the inner side outer contour of a first connecting part 101 of each first connecting piece 1 is attached to the first radial surface, and the inner side outer contour of a second connecting part 102 is attached to the circumferential surface of the iron core 6;
The insulated second connector groups with the same number of the first connector groups are arranged on the second radial surface of the iron core 6, two second connectors 2 in each second connector group are arranged at two ends with the same diameter on the second radial surface, the inner side outer contour of a third connecting part 201 of the second connector 2 is attached to the second radial surface, and the inner side outer contour of a fourth connecting part 202 of the second connector 2 is attached to the circumferential surface of the iron core 6;
step two: winding the iron core 6 with yarn belt in ring shape by taking any position of the iron core 6 as a starting end, covering Zhou Sha belt width on each ring wound yarn belt by at least 1/2; wrapping insulating materials after annular winding, wherein the surfaces of the first connecting piece group and the second connecting piece group are completely exposed during wrapping, and sealing treatment is performed by using insulating electrical tape after wrapping;
step three: selecting ampere-turns according to the product requirement, calculating the quotient of the ampere-turns and the secondary current to obtain the number of turns of the secondary winding, setting the size parameter and the secondary number of turns parameter of the iron core 6 on a winding machine, and carrying out coil winding on the iron core 6 to obtain a coil winding;
step four: combining adjacent coil windings in any number of coil windings into a current coil through a first connector group and a second connector group; the first connecting portion 101 includes a first positioning slot 1011, the second connecting portion 102 includes at least two second positioning slots 1021, the third connecting portion 201 includes a third positioning slot 2011 and a first positioning bolt 2012, the fourth connecting portion 202 includes at least two fourth positioning slots 2021, and at least one insulating support member is clamped on the second positioning slot 1021 or the fourth positioning slot 2021; the first positioning bolts 2012 and the first positioning grooves 1011 are mutually engaged to combine adjacent iron cores 6 in any number of iron cores 6, one end of the supporting piece is engaged in any one of the second positioning grooves 1021 or the fourth positioning grooves 2021, and the other end of the supporting piece is fixed on the transformer die 5 to fix the current coil in the transformer die 5;
Step five: and after the combination is finished, welding the inserts, checking the current coils, and sending the current coils to a die filling process after the current coils are checked to be qualified.
In the first step, the circular cylindrical iron core 6 includes a first radial surface and a second radial surface that are parallel to each other and a circumferential surface that is located between the first radial surface and the second radial surface, the first connecting piece 1 is attached to the iron core 6 in a manner of bonding, binding an electrical tape, or using a magnet material as one of the first connecting pieces 1, and the second connecting piece 2 is attached to the iron core 6 in a manner of bonding, binding an electrical tape, or using a magnet material as one of the second connecting pieces 2, so that the first connecting piece 1 and the second connecting piece 2 are primarily fixed on the iron core 6, thereby facilitating subsequent winding. In some embodiments, if the fixing member 3 is used, the fixing member 3 may be placed at the center of the second connecting portion 102 and the fourth connecting portion 202, and the second connecting portion 102 and the fourth connecting portion 202 may be pressed toward the core 6, so as to fix the first connecting member 1 and the second connecting member 2, and directly press the winding wire onto the fixing member 3 during winding. In the second step, the function of the yarn belt is to fix the first connector set and the second connector set. Utilize insulating electrical tape winding to wrap, prevent that current transformer from taking place the short circuit in the operation in-process, wrap up the time, the surface of first connecting piece group and second connecting piece group exposes completely and is in between the wire winding, be convenient for coil winding merge and with mutual-inductor mould 5 fixed, first connecting piece group can overlap with second connecting piece group and establish high temperature insulation silica gel cover, consequently can not take place the short circuit between wire winding and first connecting piece group, the second connecting piece group. The insulating materials wrapped after the annular winding are J-30 insulating self-adhesive tape, insulating crepe paper, polyester paper and the like, and the insulating materials are used for preventing short circuit and error and out of tolerance; in addition, a buffer material such as a foaming silica gel strip can be added to play a role in buffering. In the third step, the ampere-turns are specification parameters required by actual products, the secondary current is the attribute of the current transformer, the current transformer belongs to known content, the value of the ampere-turns is A, the value of the secondary current is B, the value of the secondary turns C is the quotient of 'A/B', and the value of the secondary turns C is the number of turns wound on a coil winding.
In some embodiments, when the transformer die 5 is a busbar type current transformer, step four includes:
the transformer die 5 is provided with a convex part in an outward protruding mode, the convex part is provided with a first positioning hole 501, the axis of the first positioning hole 501 is perpendicular to the bottom surface of the transformer die 5, the axis of the iron core 6 is perpendicular to the bottom surface of the transformer die 5, the second positioning groove 1021 or the fourth positioning groove 2021 is provided with at least one insulating supporting part in a clamping mode, the supporting part is a supporting plate 401, one end of the supporting part is provided with a second positioning bolt 4011, and the other end of the supporting part is provided with a U-shaped notch matched with the diameter of the first positioning hole 501;
the first positioning pin 2012 engages with the first positioning groove 1011 to fix the adjacent core 6, the second positioning pin 4011 engages with any one of the second positioning groove 1021 and the fourth positioning groove 2021, the U-shaped recess engages with the wall of the first positioning hole 501, and the core 6 is fixed in the transformer mold 5.
When the coil windings are combined, the first positioning bolt 2012 is plugged into the opening end of the first positioning slot 1011, and moves towards the closing end of the first positioning slot 1011 along the inside of the first positioning slot 1011, and after moving to the closing end of the first positioning slot 1011, a certain included angle exists between the opening end and the closing end of the first positioning slot 1011 and is not 180 degrees, so that the first positioning bolt 2012 can be clamped at the closing end of the first positioning slot 1011 and does not slide. After the combination, the second locating bolts 4011 of the supporting plate 401 are clamped into any one of the second locating grooves 1021 or the fourth locating grooves 2021, so that the current transformer is contained in the bus type current transformer, the current coil and the transformer die 5 can be fixed by clamping the U-shaped notch into the hole wall of the first locating hole 501, the fixed bus type current transformer is not easy to shake, the problems of short circuit, breakdown and the like are avoided, and the stability of the bus type current transformer is improved. In addition, in order to stabilize the current coil more, the first method is to install the support plate 401 on the second positioning slot 1021 or the fourth positioning slot 2021 closest to the middle of the current coil, so that the support plate 401 breaks down the gravity of the current coil more uniformly, and the provided support piece is more balanced; the second method is to connect the plurality of second positioning grooves 1021 or the fourth positioning grooves 2021 with the transformer mold 5 by using the plurality of support plates 401, so that the self weight of the current coil is more fully decomposed.
In some embodiments, when the transformer die 5 is a pillar type current transformer, step four includes:
the top of the transformer die 5 is a cover plate, a second positioning hole 502 is formed in the cover plate, the axis of the iron core 6 is parallel to the bottom surface of the transformer die 5, at least one insulating support piece is clamped on the second positioning groove 1021 or the fourth positioning groove 2021, the support piece is a screw 402, one end of the support piece is provided with a third positioning bolt 4021, and the other end of the support piece is a screw head;
the adjacent iron core 6 is engaged with the first positioning groove 1011 by the first positioning pin 2012, the screw 402 is inserted through the second positioning hole 502, the third positioning pin 4021 is engaged with any one of the second positioning groove 1021 or the fourth positioning groove 2021, the screw head is pressed against the cover plate and covers the second positioning hole 502, and the iron core 6 is fixed in the transformer mold 5.
When the coil windings are combined, the first positioning bolt 2012 is plugged into the opening end of the first positioning slot 1011, and moves towards the closing end of the first positioning slot 1011 along the inside of the first positioning slot 1011, and after moving to the closing end of the first positioning slot 1011, a certain included angle exists between the opening end and the closing end of the first positioning slot 1011 and is not 180 degrees, so that the first positioning bolt 2012 can be clamped at the closing end of the first positioning slot 1011 and does not slide. After the combination, the third positioning bolt 4021 of the screw 402 is clamped into any one of the second positioning groove 1021 or the fourth positioning groove 2021, so that the current transformer is accommodated in the pillar type current transformer, the screw head is tightly pressed on the cover plate and covers the second positioning hole 502, the fixation of the current coil and the transformer mold 5 can be completed, the post type current transformer after fixation is not easy to shake, the problems of short circuit, breakdown and the like are avoided, and the stability of the pillar type current transformer is improved. In some embodiments, the current coils combined by the iron cores 6 with different sizes have different sizes, when the size of the iron core 6 is larger, and the third positioning bolt 4021 of the screw 402 is clamped in any one of the second positioning grooves 1021 or the fourth positioning groove 2021, the screw head cannot cover the second positioning hole 502, at this time, the card 503 is clamped into the screw positioning groove 4022 with a proper height, so as to cover the second positioning hole 502, and fix the current coil with the transformer die 5. In order to stabilize the current coil, the plurality of second positioning grooves 1021 or the fourth positioning grooves 2021 may be connected to the transformer mold 5 by using the plurality of screws 402, respectively, so that the current coil itself may be sufficiently decomposed by gravity.
Compared with the prior binding and tightening belts, the current coil designed by the application is applied to the bus-type current transformer and the strut-type current transformer, and can not fall off or be eccentric due to loosening of the current coil, so that breakdown is avoided. Compared with the prior art, the application adopts a controlled variable method, only changes the fixing mode between coil windings, namely, realizes fixing by using a first connecting piece 1 and a second connecting piece 2 (hereinafter referred to as connecting piece fixing), performs production by using three modes of binding and tightening by using a tightening belt, keeps other parameters unchanged, produces the same type (wherein bus-type current transformers are referred to as bus-type current transformers, strut-type current transformers are referred to as strut-type) and the same number of current transformers, takes no breakdown in the current transformers as a qualification standard, takes the ratio of the number of qualified current transformers to the number of produced current transformers of the same type as a qualification rate, for example, produces 10 bus-type current transformers, 9 of the current transformers do not produce breakdown, and the qualification rate is 90%. The relationship between the three fixing modes and the qualification rate is shown in Table 1:
table 1 three fixing modes and qualification rate relationship table
According to the three fixing modes and the qualification rate relation table, the coil winding is fixed by the connecting piece, the fixing effect is good, the current coil cannot shake, fall or be eccentric, breakdown cannot occur, the qualification rate is 100%, the qualification rate of the current transformer is improved, and the quality of the current transformer is improved. In addition, the qualification rate reaches 100%, so that the cost for manufacturing the current transformer is reduced, and the economic benefit of the product is improved; when in use, measurement errors are not caused, and the measurement accuracy is improved; no breakdown occurs and the safety is higher.
In summary, the coil connecting device, the current coil and the manufacturing method provided by the embodiment of the application can quickly combine the coil windings, and improve the working efficiency. Utilize first connecting piece group and second connecting piece combination and coil winding for current coil's order is arbitrary to be combined, and the current transformer can be stably fixed inside the current transformer, and the output capacity of product, the quality of product, the precision of product have obtained the promotion, satisfy actual demand. The support piece is utilized to fix the current coil inside the current transformer, so that the material cost is low and the operation is simple. By using the current coil and the manufacturing method provided by the application, the quality hidden trouble of short circuit, breakdown and the like is eliminated, and the product quality is ensured.
While the application has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present application. Accordingly, the scope of the application is defined by the appended claims.

Claims (12)

1. A coil connecting device for combining coils, the coil comprising an iron core, characterized by comprising an insulated first connecting piece and an insulated second connecting piece, wherein an inner outer contour of one end of the first connecting piece is attached to a first radial surface of the iron core, an inner outer contour of the other end of the first connecting piece is attached to a circumferential surface of the iron core, an inner outer contour of one end of the second connecting piece is attached to a second radial surface of the iron core, and an inner outer contour of the other end of the second connecting piece is attached to the circumferential surface of the iron core; the first connecting piece is provided with a first positioning groove, the second connecting piece is provided with a first positioning bolt, and adjacent iron cores in any number of the iron cores are combined along the axial direction of the iron cores through the clamping connection between the first positioning groove on the first connecting piece and the first positioning bolt on the second connecting piece.
2. The coil connecting apparatus according to claim 1, wherein,
the first connecting piece comprises a first connecting part and a second connecting part which are perpendicular to each other, a junction is smoothly connected between the first connecting part and the second connecting part, the first positioning groove is formed in the first connecting part, the opening end of the first positioning groove faces the junction, and the closed end of the first positioning groove is positioned on the first connecting part; the second connecting part comprises at least two second positioning grooves, the opening ends of the second positioning grooves are positioned at the edges of the second connecting part, and the closing ends of the second positioning grooves are positioned on the second connecting part;
the second connecting piece comprises a third connecting part and a fourth connecting part which are perpendicular to each other, the third connecting part comprises a third positioning groove and the first positioning bolt, the third positioning groove is positioned on the third connecting part, and the first positioning bolt slides in the third positioning groove; the fourth connecting part comprises at least two fourth positioning grooves, the opening ends of the fourth positioning grooves are positioned at the outer edge of the fourth connecting part, and the closed ends of the fourth positioning grooves are positioned on the fourth connecting part;
The first connecting piece with the second connecting piece is connected with the block of first constant head tank through first constant head tank, the second constant head tank or the block of fourth constant head tank is gone up to have at least one support piece.
3. A current coil based on the coil connecting device according to any one of claims 1-2, said current coil being fixed in a transformer mould comprising a core, characterized in that,
at least one group of insulating first connecting piece groups are arranged on the first radial surface of the iron core, each group of first connecting piece groups comprises two first connecting pieces arranged at two ends of the same diameter of the first radial surface, each first connecting piece comprises a first connecting part and a second connecting part, the inner side outer contour of each first connecting part is attached to the first radial surface, and the inner side outer contour of each second connecting part is attached to the circumferential surface;
the second radial surface of the iron core is provided with insulating second connecting piece groups, the number of the insulating second connecting piece groups is the same as that of the first connecting piece groups, each second connecting piece group comprises two second connecting pieces which are arranged at two ends of the same diameter of the second radial surface, each second connecting piece comprises a third connecting part and a fourth connecting part, the inner side outer contour of the third connecting part is attached to the second radial surface, and the inner side outer contour of the fourth connecting part is attached to the circumferential surface;
The transformer die is internally provided with at least two coaxial iron cores, adjacent iron cores in any number of iron cores are mutually clamped with the third connecting part through the first connecting part, at least one insulating supporting piece is clamped on the second connecting part or the fourth connecting part, the iron cores are fixed in the transformer die through the supporting piece, one end of each supporting piece is clamped on any one of the second connecting part or the fourth connecting part, and the other end of each supporting piece is fixed on the transformer die.
4. A current coil according to claim 3, wherein,
the first connecting part and the second connecting part are mutually perpendicular, a junction is smoothly connected between the first connecting part and the second connecting part, the first connecting part comprises a first positioning groove, the opening end of the first positioning groove faces the junction, and the closed end of the first positioning groove is positioned on the first connecting part; the second connecting part comprises at least two second positioning grooves, the opening ends of the second positioning grooves are positioned at the edges of the second connecting part, and the closing ends of the second positioning grooves are positioned on the second connecting part;
The third connecting part and the fourth connecting part are mutually perpendicular, the third connecting part comprises a third positioning groove and a first positioning bolt, the third positioning groove is positioned on the third connecting part, and the first positioning bolt slides in the third positioning groove; the fourth connecting part comprises at least two fourth positioning grooves, the opening ends of the fourth positioning grooves are positioned at the outer edge of the fourth connecting part, and the closed ends of the fourth positioning grooves are positioned on the fourth connecting part;
the transformer die is internally provided with at least two coaxial iron cores, adjacent iron cores in any number of iron cores are mutually clamped with the first positioning grooves through the first positioning bolts, at least one insulating supporting piece is clamped on the second positioning grooves or the fourth positioning grooves, the iron cores are fixed in the transformer die through the supporting piece, one end of each supporting piece is clamped in any one of the second positioning grooves or the fourth positioning grooves, and the other end of each supporting piece is fixed on the transformer die.
5. The current coil according to claim 4, wherein insulating fixing members are provided on the second connecting portion and the fourth connecting portion, and the fixing members are attached to the second connecting portion, so as to press the second connecting portion against the circumferential surface of the core; the fixing piece is attached to the fourth connecting portion and used for pressing the fourth connecting portion to the circumferential surface of the iron core.
6. The current coil according to claim 5, wherein the fixing member is a magnetic fixing member, and the second connecting portion is pressed against the circumferential surface by a magnetic attraction force of the fixing member and the core; the fourth connecting part is pressed on the circumferential surface through the magnetic attraction force of the fixing piece and the iron core.
7. The current coil of claim 4, wherein when the transformer die is a busbar type current transformer die, a protruding member protrudes outwards from the transformer die, a first positioning hole is formed in the protruding member, an axis of the first positioning hole is perpendicular to a bottom surface of the transformer die, an axis of the iron core is perpendicular to the bottom surface of the transformer die, adjacent iron cores in any number are mutually clamped with the first positioning groove through being arranged in the first positioning hole, at least one insulating supporting member is clamped on the second positioning groove or the fourth positioning groove, the iron cores are fixed in the transformer die through the supporting member, the supporting member is a supporting sheet, one end of the supporting member is provided with a second positioning pin, the second positioning pin is clamped in any one of the second positioning groove or the fourth positioning groove, the other end of the supporting member is provided with a U-shaped notch matched with the diameter of the first positioning hole, and the U-shaped notch is clamped with the wall of the first positioning hole.
8. The current coil of claim 4, wherein when the transformer die is a pillar type current transformer die, a cover plate is arranged at the top of the transformer die, a second positioning hole is formed in the cover plate, the axis of the iron core is parallel to the bottom surface of the transformer die, adjacent iron cores in any number of iron cores are mutually clamped with the first positioning groove through the first positioning bolt, at least one insulating supporting piece is clamped on the second positioning groove or the fourth positioning groove, the iron cores are fixed in the transformer die through the supporting piece, the supporting piece is a screw, a third positioning bolt is arranged at one end of the supporting piece, the screw penetrates through the second positioning hole and clamps the third positioning bolt in any one of the second positioning grooves or the fourth positioning groove, and a screw head is arranged at the other end of the supporting piece and is tightly pressed on the cover plate and covers the second positioning hole.
9. The current coil of claim 8, wherein a card is provided on the cover plate, at least one screw positioning groove is provided on the screw, the card has a notch matching the shape of the screw positioning groove, the screw passes through the second positioning hole and engages the third positioning pin in any one of the second positioning groove or the fourth positioning groove, and the screw engages the screw positioning groove through the notch of the card to fix the screw head on the cover plate.
10. A method of manufacturing a current coil according to any one of claims 3 to 9, comprising the steps of:
step one: at least one group of insulating first connecting piece groups are arranged on the first radial surface of the iron core, two first connecting pieces in each group of first connecting piece groups are arranged at two ends of the same diameter of the first radial surface, the inner side outer contour of a first connecting part of each first connecting piece is attached to the first radial surface, and the inner side outer contour of each second connecting part is attached to the circumferential surface of the iron core;
mounting insulating second connector groups with the same number as the first connector groups on a second radial surface of the iron core, wherein two second connectors in each second connector group are mounted at two ends with the same diameter on the second radial surface, the inner side outer contour of a third connecting part of the second connectors is attached to the second radial surface, and the inner side outer contour of a fourth connecting part of the second connectors is attached to the circumferential surface of the iron core;
step two: winding the iron core with a yarn band in a ring shape by taking any position of the iron core as a starting end, and covering Zhou Sha band width on each ring-shaped wound yarn band by at least 1/2; wrapping insulating materials after annular winding, wherein the surfaces of the first connecting piece group and the second connecting piece group are completely exposed during wrapping, and sealing treatment is performed by using an insulating electrical tape after wrapping;
Step three: selecting ampere turns according to the product requirement, calculating the quotient of the ampere turns and the secondary current to obtain the number of turns of the secondary winding, setting an iron core size parameter and a secondary number of turns parameter on a winding machine, and carrying out coil winding on the iron core to obtain a coil winding;
step four: combining adjacent ones of the coil windings into a current coil through the first connector set and the second connector set; the first connecting part comprises a first positioning groove, the second connecting part comprises at least two second positioning grooves, the third connecting part comprises a third positioning groove and a first positioning bolt, the fourth connecting part comprises at least two fourth positioning grooves, and at least one insulating supporting piece is clamped on the second positioning groove or the fourth positioning grooves; the first positioning bolts and the first positioning grooves are mutually clamped to be used for combining adjacent iron cores in any number of iron cores, one end of the supporting piece is clamped in any one of the second positioning grooves or the fourth positioning grooves, and the other end of the supporting piece is fixed on a transformer die and used for fixing the current coil in the transformer die;
Step five: and after the combination is finished, welding the inserts, checking the current coils, and sending the current coils to a die filling process after the current coils are checked to be qualified.
11. The method of manufacturing a current coil according to claim 9, wherein when the transformer die is a bus-bar type current transformer, step four includes:
the transformer die is provided with a convex part in an outward protruding mode, the convex part is provided with a first positioning hole, the axis of the first positioning hole is perpendicular to the bottom surface of the transformer die, the axis of the iron core is perpendicular to the bottom surface of the transformer die, at least one insulating supporting piece is clamped on the second positioning groove or the fourth positioning groove, the supporting piece is a supporting piece, one end of the supporting piece is provided with a second positioning bolt, and the other end of the supporting piece is provided with a U-shaped notch matched with the diameter of the first positioning hole;
and using the first positioning bolt to clamp adjacent iron cores with the first positioning groove, clamping the second positioning bolt in any one of the second positioning groove or the fourth positioning groove, clamping the U-shaped notch on the hole wall of the first positioning hole, and fixing the iron cores in the transformer die.
12. The method of manufacturing a current coil according to claim 9, wherein when the transformer mold is a pillar type current transformer, step four includes:
the top of the transformer die is a cover plate, a second positioning hole is formed in the cover plate, the axis of the iron core is parallel to the bottom surface of the transformer die, at least one insulating support piece is clamped on the second positioning groove or the fourth positioning groove, the support piece is a screw, one end of the support piece is provided with a third positioning bolt, and the other end of the support piece is a screw head;
and using the first positioning bolt to clamp adjacent iron cores with the first positioning groove, enabling the screw to pass through the second positioning hole, enabling the third positioning bolt to be clamped in any one of the second positioning groove or the fourth positioning groove, tightly pressing the screw head on the cover plate and covering the second positioning hole, and fixing the iron cores in the transformer die.
CN202311013262.7A 2023-08-14 2023-08-14 Coil connecting device, current coil and manufacturing method thereof Active CN116741508B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2107705U (en) * 1990-12-29 1992-06-17 章志桐 Double-division type current transformer
EP0635922A1 (en) * 1993-06-25 1995-01-25 Siemens Aktiengesellschaft Fault current acquiring device having high sensitivity
CN209388816U (en) * 2019-03-09 2019-09-13 北京市北方森源电气有限责任公司 Convenient mount type current transformer
CN215815473U (en) * 2021-06-29 2022-02-11 河南澳美电气有限公司 Outdoor mutual inductor convenient to installation
CN114203425A (en) * 2020-09-17 2022-03-18 任丘市长城互感器有限公司 Low-voltage DC-resistant current transformer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2107705U (en) * 1990-12-29 1992-06-17 章志桐 Double-division type current transformer
EP0635922A1 (en) * 1993-06-25 1995-01-25 Siemens Aktiengesellschaft Fault current acquiring device having high sensitivity
CN209388816U (en) * 2019-03-09 2019-09-13 北京市北方森源电气有限责任公司 Convenient mount type current transformer
CN114203425A (en) * 2020-09-17 2022-03-18 任丘市长城互感器有限公司 Low-voltage DC-resistant current transformer
CN215815473U (en) * 2021-06-29 2022-02-11 河南澳美电气有限公司 Outdoor mutual inductor convenient to installation

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