CN202650811U

CN202650811U - Low-voltage coil for dry type transformer

Info

Publication number: CN202650811U
Application number: CN201220271533XU
Authority: CN
Inventors: 俞文明; 王建林; 冯向军
Original assignee: CHANGSHU CHANGYUAN TRANSFORMER Co Ltd
Current assignee: CHANGSHU CHANGYUAN TRANSFORMER Co Ltd
Priority date: 2012-06-11
Filing date: 2012-06-11
Publication date: 2013-01-02
Anticipated expiration: 2022-06-11

Abstract

The utility model discloses a low-voltage coil for a dry type transformer. The low-voltage coil comprises a multi-turn winding formed by winding conductance layers and an insulation layer, at least one insulation layer is arranged between the adjacent conductance layers and used for isolating. At least one resin insulation layer is arranged on the surface of the insulation layer. The low-voltage coil further comprises an inner insulation layer and an outer insulation layer arranged on the inner surface and the outer surface of the winding. The resin insulation layers are arranged on the inner surfaces of the inner insulation layer and the outer insulation layer. Two ends of the inner insulation layer and the outer insulation layer are higher than the winding. The low-voltage coil further comprises an insulation end which is arranged at two ends of the winding and between the inner insulation layer and the outer insulation layer. The low-voltage coil structure only needs drying and end packaging after winding. Pouring is not required by adopting novel process and novel insulation materials, cost is saved, the process is reliable after being used for many years, the coil can not be damp, and the mechanical strength can meet requirements.

Description

A kind of low voltage coil for dry transformer

Technical field

The utility model relates to field transformer, particularly relates to a kind of low voltage coil for dry transformer.

Background technology

Dry-type transformer is that a kind of iron core and winding are not immersed in the transformer in the iknsulating liquid for oil-filled transformer, generally is used for localized lighting, electronic circuit.As a vitals in the dry-type transformer: low-voltage coil, the traditional manufacturing technique of described low-voltage coil adopts pouring technology: coil coiling on special-purpose inner mold, after coiling is finished, load onto outer mold and end plate up and down, potting resin in the vacuum pouring tank, and then in curing oven, solidify, and then after equitemperature falls, remove outer mold and upper head plate, extract again at last inner mold.This process is very loaded down with trivial details, and very high to temperature requirement when extracting the gentle guidance tape of inner mold, is difficult to when temperature is incorrect extract.

The utility model content

The technical problem that the utility model mainly solves provides a kind of low voltage coil for dry transformer structure, need not pour into a mould, and is easily manufactured.

For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of low voltage coil for dry transformer is provided, comprise the winding that is formed multiturn by conductive layer and insulating barrier coiling, have at least a layer insulating to separate between the adjacent described conductive layer, the surface of described insulating barrier comprises at least one deck resin insulating barrier, described low-voltage coil also comprises inner insulating layer and the external insulation layer that is positioned at winding inner surface and outer surface, the inner surface of described inner insulating layer and external insulation layer has resin insulating barrier, described inner insulating layer and external insulation layer two ends are higher than winding, described low-voltage coil also comprises insulating end, and described insulating end is placed in the two ends of winding and between interior external insulation layer.

In preferred embodiment of the utility model, described low-voltage coil also comprises some air gap stays, and described air gap stay is between the conductive layer and insulating barrier of described winding mid portion, and through the axial distance of conductive layer and insulating barrier.

In preferred embodiment of the utility model, described air gap stay is strip, and the cross section is butterfly.

In preferred embodiment of the utility model, the cross section ovalize of described low-voltage coil.

In preferred embodiment of the utility model, described low-voltage coil also comprises interior connection row, and described interior connection ranking is in low-voltage coil inside and run through the axial two ends of low-voltage coil.

The beneficial effects of the utility model are: the utility model low voltage coil for dry transformer structure after coiling is finished, only needs oven dry, end envelope to get final product; Adopting new techniques and new insulating material need not poured into a mould, and save cost, are reliable technique for many years through operation, and coil can not make moist, and mechanical strength can meet the demands.

Description of drawings

Fig. 1 is the structural representation of the utility model low voltage coil for dry transformer one preferred embodiment;

Fig. 2 is the structural representation of looking up of low voltage coil for dry transformer shown in Figure 1;

Fig. 3 is the schematic cross-section of the stay of air gap shown in Fig. 1;

The mark of each parts is as follows in the accompanying drawing: 11 is that conductive layer, 12 is that insulating barrier, 13 is that inner insulating layer, 14 is that external insulation layer, 15 is that upper insulating end, 16 is that lower insulating end, 17 is that air gap stay, 18 is that interior connection is arranged.

Embodiment

Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described in detail, thereby so that advantage of the present utility model and feature can be easier to be it will be appreciated by those skilled in the art that protection range of the present utility model is made more explicit defining.

See also Fig. 1 and Fig. 2, the utility model embodiment comprises:

A kind of low voltage coil for dry transformer comprises conductive layer 11, insulating barrier 12, inner insulating layer 13, external insulation layer 14, upper insulating end 15, lower insulating end 16, air gap stay 17 and the connection of being connected row 18.

Described conductive layer 11 and insulating barrier 12 are preferably and are laminated structure, and alternating floor carries out coiling between described conductive layer 11 and insulating barrier 12 one decks, form the winding (not mark) of multiturn; The insulating barrier 12 of as required coiling first-class or multilayer between the adjacent two conductive layers 11, two surfaces of described insulating barrier 12 are coated with one or more layers insulating resin at least.Described inner insulating layer 13 is positioned at the inner surface of winding, described external insulation layer is positioned at the outer surface of winding, and described inner insulating layer 13 and external insulation layer 14 two ends are higher than winding, form the placement space at two ends, described upper insulating end 15 and lower insulating end 16 just lay respectively at up and down in two described placement spaces.

Described upper insulating end 15 and lower insulating end 16 are made by insulating material; Described inner insulating layer 13 and described external insulation layer 14 have insulating resin near the surface-coated of winding at least.

Described air gap stay 17 is between the conductive layer 11 and insulating barrier 12 of described winding mid portion, and through the axial distance of conductive layer 11 and insulating barrier 12.The cross section of described air gap stay 17 preferably adopts two ends to protrude middle recessed butterfly-like structure.

Preferably, described low-voltage coil coiling cross section ovalize, described low-voltage coil also comprise interior connection row 18, and described interior connection row 18 is positioned at low-voltage coil inside and contacts with conductive layer 11, and the axial two ends of thorough coil have at least an end to stretch out low-voltage coil and can connect external equipment.

The utility model low voltage coil for dry transformer structure, after coiling is finished, only need oven dry, end envelope to get final product, do not need cast, the concrete technology flow process is: low-voltage coil (normally can be used wooden die, make simple at common die, cost is low) upper coiling, around complete rear directly low-voltage coil is extracted (being easy to extract), then continue next low-voltage coil of coiling, the continuity of production is guaranteed.Because the layer insulation of low-voltage coil, overhang insulation and interior external insulation adopt the insulating material from resin, so it is namely plastic that the complete coil of coiling is placed directly in the rear taking-up of heating in the curing oven, and insulation property, mechanical performance are guaranteed.

The utility model low voltage coil for dry transformer structure, adopting new techniques and new insulating material need not poured into a mould, and save cost, are reliable technique for many years through operation, and low-voltage coil can not make moist, and mechanical strength can meet the demands.

The above only is embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.

Claims

1. low voltage coil for dry transformer, comprise the winding that is formed multiturn by conductive layer and insulating barrier coiling, have at least a layer insulating to separate between the adjacent described conductive layer, it is characterized in that, the surface of described insulating barrier comprises at least one deck resin insulating barrier, described low-voltage coil also comprises inner insulating layer and the external insulation layer that is positioned at winding inner surface and outer surface, the inner surface of described inner insulating layer and external insulation layer has resin insulating barrier, described inner insulating layer and external insulation layer two ends are higher than winding, described low-voltage coil also comprises insulating end, and described insulating end is placed in the two ends of winding and between interior external insulation layer.

2. low voltage coil for dry transformer according to claim 1, it is characterized in that, described low-voltage coil also comprises some air gap stays, and described air gap stay is between the conductive layer and insulating barrier of described winding mid portion, and through the axial distance of conductive layer and insulating barrier.

3. low voltage coil for dry transformer according to claim 2 is characterized in that, described air gap stay is strip, and the cross section is butterfly.

4. low voltage coil for dry transformer according to claim 1 is characterized in that, the cross section ovalize of described low-voltage coil.

5. low voltage coil for dry transformer according to claim 1 is characterized in that, described low-voltage coil also comprises interior connection row, and described interior connection ranking is in low-voltage coil inside and run through the axial two ends of low-voltage coil.