CN212230219U

CN212230219U - Cake-type coil capable of eliminating local bulge and reducing insulation distance

Info

Publication number: CN212230219U
Application number: CN202021364340.XU
Authority: CN
Inventors: 冯民权; 文学; 许永金; 宋磊; 吴中英
Original assignee: YUNNAN TONGBIAN ELECTRIC APPARATUS CO Ltd
Current assignee: YUNNAN TONGBIAN ELECTRIC APPARATUS CO Ltd
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2020-12-25
Anticipated expiration: 2030-07-13

Abstract

The utility model provides a cake type coil which can eliminate local bulges and reduce the insulation distance, which relates to the technical field of power supply corollary equipment, and particularly comprises an insulating cylinder (1), a stay (2) arranged on the outer wall of the insulating cylinder (1), and wire cakes sequentially wound on the stay (2) along the axial direction of the insulating cylinder (1); transposition structure of adjacent coil: the wires are subjected to wire inlet and outlet transposition at adjacent intervals; for the winding of more than two wires, the overlapping of the wire inlet and outlet transposition of different wires in the same stay (2) interval can occur, so that high wires are caused; according to the coil winding technology, the incoming line and outgoing line structure is changed, the number of turns of winding is the same, the transposition of incoming and outgoing lines is free of overlapping, the surface of the coil wound by the technology is smooth and attractive, high lines do not exist, the insulation distance between the coils can be shortened during product design, the product cost is reduced, and meanwhile the mechanical strength of the product is improved.

Description

Cake-type coil capable of eliminating local bulge and reducing insulation distance

Technical Field

The utility model relates to a technical field of the general spare part of transformer or inductor, concretely relates to cake formula coil of transformer.

Background

The transformer is a device which converts voltage and current of one grade into voltage and current of the same frequency and the other grade by utilizing the principle of electromagnetic induction and transmits electric energy, is an important device in power transmission and transformation equipment, is in a very critical position in a power grid, and is a main device for ensuring the electricity utilization in social production.

The coil of the transformer forms the circuit part of the equipment itself, it is connected with the external electric network directly, it is the most important part in the transformer, the coil in the transformer includes low-voltage coil, medium-voltage coil, high-voltage coil, voltage regulation coil, according to the difference of the required transformer product capacity grade, carry on the corresponding coil of coiling. The voltage regulating coils of common transformer products are mostly in a cylindrical type and a cake type, and the cake type coils adopt a knot type and a continuous type.

The cake-type coil is mostly formed by winding two or more than two conducting wires, in order to ensure that the radial thickness of the wire cake is consistent and no part is higher in the thickness direction, commonly called as a high wire, fractional turns are mostly adopted, and the general method is as follows: the turns of other normal cakes are not integers except for the first cake and the last cake, if the number of coil struts is 12, the fraction part of the normal turns is 11/12, namely, one less brace is wound for spacing, the transposed conductor needs to be wound for spacing more than two braces due to the large wire gauge, theoretically, the width-wise thickness of the cakes is consistent without local high-line, each cake has two positions of incoming wire and outgoing wire for transposition, insulation at the transposition position is easy to be damaged, insulation needs to be wrapped, if inner transposition and outer transposition of the cake is overlapped at one brace spacing, detailed view is shown in figure 1, the width-wise thickness of the transposition position at the interval of the braces is higher than the insulation thickness wrapped by two conductors, the condition of the local high-line still exists, the insulation distance between the high-line wires of the local coil is reduced, meanwhile, the cake is uneven, the coil cannot be tightly supported when being sleeved, and the mechanical strength of a product is reduced.

Disclosure of Invention

In order to solve the problem, the utility model provides a can eliminate local protruding cake formula coil of reducing insulation distance through the inlet wire and the outlet structure that have improved the coil, guarantees that business turn over line transposition department does not have the overlap, reduces insulation distance between the coil, reduces product cost.

In order to achieve the above object, the utility model adopts the following technical means: a cake-type coil capable of eliminating local bulges and reducing insulation distance is characterized by comprising an insulation cylinder 1, a stay 2 arranged on the outer wall of the insulation cylinder 1 and a wire cake sequentially wound on the stay 2 along the axial direction of the insulation cylinder 1; the number of the wire cakes is at least two.

The wire cakes comprise an inner-layer coil 3 and an outer-layer coil 4 which are positioned in the same radial section and are independent from each other except for the wire cake at the tail end, and a plurality of radial supporting blocks 5 which are encircled into an arc shape are arranged between the inner-layer coil 3 and the outer-layer coil 4, so that an interval for axial heat dissipation is formed between the inner-layer coil 3 and the outer-layer coil 4; the inner coil 3 is supported by the stay 2 and forms a space with the outer wall of the insulating cylinder 1 for axial heat dissipation of the inner coil 3.

In the axial of insulating cylinder 1, set up axial supporting shoe 6 between two adjacent cake formula coils to form the ring form around the circumference of rolling up the drum, so that form between two adjacent cake formula coils and be used for radial radiating interval, axial supporting shoe 6 runs through the inlayer coil 3 and the outer coil 4 that support adjacent cake formula coil.

The coils of different wire cakes are wound according to the following structure: the inner coil 3 of the previous coil cake is connected with the inner coil 3 of the next coil cake in sequence until the inner coil 3 of the last coil cake is connected to the outer coil 4 of the last coil cake, and then the outer coils 4 are also connected in sequence according to the structure of the inner coils 3 until the outer coils 4 of the first coil cake are returned.

The wire inlet and outlet transposition structures of the inner coil 3 and the outer coil 4 of the adjacent wire cakes are as follows: the transposition structure is characterized in that an outlet end is bent inwards along the radial direction of the coil and then wraps an insulating layer, the outlet end of the last coil is connected to the inlet end of the coil, the wire is led in from the nth stay 2 and the (n + 1) th stay 2 at intervals, after winding is completed, the outlet end is transposed from the (n-1) th stay 2 and the nth stay 2 at intervals, and the inlet position and the outlet position are not overlapped.

Preferably, for a coil of two wires, the wire feeding position of the first wire is the interval between any two stays 2, and the wire feeding position of the second wire and the wire feeding position of the first wire are separated from each other by two stays 2, that is, by one unit interval composed of two stays 2; the outlet position of the first wire is the interval of the previous stay 2 of the inlet position of the first wire; the outlet position of the second wire is the interval of the previous stay 2 of the inlet position of the second wire.

The principle and the beneficial effects of the application are as follows: the application adopts a skip position changing structure, and solves the high line problem of the cake-shaped coil position changing position. In the traditional transposition structure, wires are subjected to wire in and out transposition at adjacent intervals, and for the winding of more than two wires, the overlapping of the wire in and out transposition of different wires in the same stay 2 interval can occur, so that a high wire is caused; according to the coil winding technology, the incoming line and outgoing line structure is changed, the number of turns of winding is the same, the transposition of incoming and outgoing lines is free of overlapping, the surface of the coil wound by the technology is smooth and attractive, high lines do not exist, the insulation distance between the coils can be shortened during product design, the product cost is reduced, and meanwhile the mechanical strength of the product is improved.

Drawings

Fig. 1 is a schematic diagram illustrating a high-speed winding phenomenon occurring when a coil is wound in the prior art.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3 is a schematic diagram of the connection between adjacent coils in the present invention.

FIG. 4 is a schematic view of the structure of the pancake coil described in example 1.

FIG. 5 is a schematic view of the structure of the pancake coil described in example 2.

In the figure: the coil comprises an insulating cylinder 1, a stay 2, an inner-layer coil 3, an outer-layer coil 4, a radial supporting block 5 and an axial supporting block 6.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Example 1

As shown in fig. 2-4, the pancake coil capable of eliminating local protrusion and reducing insulation distance in this embodiment includes an insulation cylinder 1, a stay 2 disposed on an outer wall of the insulation cylinder 1, and a wire cake sequentially wound around the stay 2 along an axial direction of the insulation cylinder 1, where the wire cake is wound by a single wire; the wire cakes comprise an inner-layer coil 3 and an outer-layer coil 4 which are positioned in the same radial section and are independent from each other except for the wire cake at the tail end, and a plurality of radial supporting blocks 5 which are encircled into an arc shape are arranged between the inner-layer coil 3 and the outer-layer coil 4, so that an interval for axial heat dissipation is formed between the inner-layer coil 3 and the outer-layer coil 4; the inner coil 3 is supported by the stay 2 and forms a space with the outer wall of the insulating cylinder 1 for axial heat dissipation of the inner coil 3.

The coil of the wire cake is wound according to the following structure: the inner coil 3 of the previous coil cake is sequentially connected with the inner coil 3 of the next coil cake until the inner coil 3 of the last coil cake is connected to the outer coil 4 of the last coil cake, and then the outer coils 4 are sequentially connected according to the structure of the inner coils 3 until the inner coils return to the outer coil 4 of the first coil cake; the wire inlet and outlet transposition structures of the inner coil 3 and the outer coil 4 of the adjacent wire cakes are as follows: the transposition structure is wrapped up the insulating layer by the wire outlet end after radially inwards buckling along the coil, and the wire outlet end of last coil is connected to the inlet wire end of this coil, for example: and (3) feeding wires from the 5 th to 6 th supporting strips 2 at intervals, after the winding is finished, the wire outlet end is transposed from the 4 th to 5 th supporting strips 2 at intervals, and the wire inlet position and the wire outlet position are not overlapped.

Example 2

As shown in fig. 2-3 and 5, the pancake coil capable of eliminating local protrusions and reducing insulation distance in the present embodiment has a structure substantially the same as that in embodiment 1, except that the coil is formed by winding two windings, each wire transposition occupies an interval during winding, for example, an incoming wire is transposed in two intervals of 5-6 and 7-8 number stays 2, an outgoing wire is transposed in two intervals of 4-5 and 6-7 number stays 2, the number of winding turns is the same, but the incoming and outgoing wire transpositions are not overlapped.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A pie-shaped coil capable of eliminating local bulges and reducing insulation distance is characterized by comprising an insulation cylinder (1), a stay (2) arranged on the outer wall of the insulation cylinder (1) and wire cakes sequentially wound on the stay (2) along the axial direction of the insulation cylinder (1); the number of the wire cakes is at least two;

the wire cake comprises an inner layer coil (3) and an outer layer coil (4) which are positioned in the same radial section and are independent of each other except for the wire cake at the tail end, and a plurality of radial supporting blocks (5) which are enclosed into a circular arc shape are arranged between the inner layer coil (3) and the outer layer coil (4) so as to form an interval for axial heat dissipation between the inner layer coil (3) and the outer layer coil (4); the inner-layer coil (3) and the outer wall of the insulating cylinder (1) form an interval for axial heat dissipation of the inner-layer coil (3) through the support of the stay (2);

an axial supporting block (6) is arranged between two adjacent pie-shaped coils in the axial direction of the insulating cylinder (1) and forms a circular ring shape around the circumferential direction of the winding cylinder, so that a space for radial heat dissipation is formed between the two adjacent pie-shaped coils, and the axial supporting block (6) penetrates through an inner layer coil (3) and an outer layer coil (4) which support the adjacent pie-shaped coils;

the coils of different wire cakes are wound according to the following structure: the inner coil (3) of the previous coil cake is sequentially connected with the inner coil (3) of the next coil cake until the inner coil (3) of the last coil cake is connected to the outer coil (4) of the last coil cake, and then the outer coils (4) are sequentially connected according to the structure of the inner coils (3) until the outer coils (4) of the first coil cake return.

2. The pancake coil capable of eliminating local bulges and reducing insulation distance according to claim 1, wherein the wire inlet and outlet transposition structures of the inner coil (3) and the outer coil (4) of the adjacent pancake are as follows: the transposition structure is characterized in that an insulating layer is wrapped after a wire outlet end is bent inwards along the radial direction of a coil, the wire outlet end of the last coil is connected to the wire inlet end of the coil, wire is led in from the nth stay (2) and the (n + 1) th stay (2) at intervals, after winding is completed, the wire outlet end is transposed from the (n-1) th stay (2) and the nth stay (2) at intervals, and the wire inlet position and the wire outlet position are not overlapped.

3. The pancake coil capable of eliminating local protrusions and reducing insulation distance according to claim 1, wherein for a two-wire coil, the wire feeding position of the first wire is the interval between any two stays (2), and the wire feeding position of the second wire is separated from the wire feeding position of the first wire by two stays (2), namely by one unit interval consisting of two stays (2); the outlet position of the first wire is the interval of the former stay (2) of the inlet position of the first wire; the outlet position of the second wire is the interval of the previous stay (2) of the inlet position of the second wire.