CN211376390U

CN211376390U - Transformer device

Info

Publication number: CN211376390U
Application number: CN201922031289.4U
Authority: CN
Inventors: 庄加才; 徐君; 刘威; 苏金国
Original assignee: Sungrow Power Supply Co Ltd
Current assignee: Sungrow Power Supply Co Ltd
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2020-08-28
Anticipated expiration: 2029-11-21

Abstract

The utility model discloses a transformer, including two coil units that arrange side by side, coil unit includes that interior coil and cover establish the outer coil in the interior coil outside, and outer coil outside parcel has outer coil semi-conductive layer, and interior coil outside parcel has interior coil semi-conductive layer, and the whole pouring of coil unit has the insulating layer. In the transformer that this application provided, through setting up outer coil semi-conducting layer and interior coil semi-conducting layer, can improve effectively because the too high problem of local field intensity that the coil structure is irregular arouses, solve the situation that the rigid material generates heat in pouring the internal solenoid fracture that leads to, consequently, the security of the transformer that this application provided improves.

Description

Transformer device

Technical Field

The utility model relates to an electrical apparatus processing technology field, in particular to epoxy casting transformer.

Background

In the existing distribution network, high voltage electricity is provided to each load for use after being stepped down by a distribution transformer. Distribution transformers are one of the most important components. The traditional distribution transformer has many defects, such as large volume, heavy weight, large no-load loss, failure automatic isolation, easy interference of output by a power grid, and the like.

In the transformer processing process, an iron core, a winding, an insulating cushion block and the like are required to be arranged in the casting material. Due to the large difference of the thermal expansion coefficients of various materials, the casting material may crack due to cold and heat shock during the application process, and further the insulation failure may be caused. And the iron core is a rigid structure, so that the iron core is difficult to be reliably solidified with the casting material, and the casting material can be cracked in the application.

Meanwhile, in the transformer, in order to ensure that the primary and secondary sides can bear high voltage, the field intensity in the air must be required to be smaller than the breakdown voltage of the primary and secondary sides, so that the distance between the primary and secondary sides is large, the power density of a system is influenced to a certain degree, meanwhile, the magnetic leakage is too large due to the large distance between the primary and secondary sides, the loss is aggravated, the local field intensity is too high due to the irregular coil structure, and the use safety of the transformer is low.

Therefore, how to improve the use safety of the transformer is a technical problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a transformer, the safety in utilization of the transformer that this application provided improves.

In order to achieve the above object, the utility model provides a transformer, including two coil units that arrange side by side, the coil unit includes that interior coil and cover are established the outer coil in the interior coil outside, outer coil outside parcel has outer coil semi-conducting layer, interior coil outside parcel has interior coil semi-conducting layer, the whole pouring of coil unit has the insulating layer.

Preferably, an outer surface semi-conducting layer is laid outside the insulating layer, an end of the outer surface semi-conducting layer is embedded into the insulating layer, and an equal potential is arranged at an end of the outer surface semi-conducting layer and is located inside the insulating layer.

Preferably, the equipotential body is in a flare structure or a circular curvature structure.

Preferably, the motor also comprises an iron core, and an air flow channel is formed between the inner coil semi-conducting layer and the iron core at a spacing.

Preferably, the insulation layer is fixedly connected with the insulating layer, and an inner surface semi-conducting layer is arranged in the equipotential cavity.

Preferably, the equipotential cavity and the insulating layer are of an integrally formed structure.

Preferably, the transformer is a solid state transformer.

Preferably, the insulation layer includes a first insulation layer cast inside the outer surface semiconductive layer, a second insulation layer cast inside the outer surface semiconductive layer, and a third insulation layer cast on an outer surface of the outer surface semiconductive layer and an outer surface of the outer surface semiconductive layer.

Preferably, the insulating layer is of an integrally molded casting structure.

In the technical scheme, the utility model provides a transformer, including two coil units that arrange side by side, coil unit includes that interior coil and cover establish the outer coil in the interior coil outside, and outer coil outside parcel has outer coil semi-conducting layer, and interior coil outside parcel has interior coil semi-conducting layer, and the whole pouring of coil unit has the insulating layer.

As can be seen from the above description, in the transformer provided by the present application, by providing the outer coil semi-conductive layer and the inner coil semi-conductive layer, the problem of too high local field strength caused by the irregularity of the coil structure can be effectively improved, and therefore, the safety of the transformer provided by the present application is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a transformer according to an embodiment of the present invention;

FIG. 2 is a front view of the transformer of FIG. 1;

FIG. 3 is a top view of the transformer of FIG. 2;

FIG. 4 is a side view of the transformer of FIG. 2;

fig. 5 is a schematic structural diagram of another transformer according to an embodiment of the present invention;

FIG. 6 is a front view of the transformer of FIG. 5;

FIG. 7 is a top view of the transformer of FIG. 6;

FIG. 8 is a side view of the transformer shown in FIG. 6;

fig. 9 is a schematic structural diagram of another transformer according to an embodiment of the present invention;

FIG. 10 is a front view of the transformer of FIG. 9;

FIG. 11 is an enlarged view of portion A of FIG. 10;

fig. 12 is a view showing the mounting positions of the equal potential bodies according to the embodiment of the present invention;

fig. 13 is a diagram showing the mounting positions of another kind of the equivalent electric potential provided in the embodiment of the present invention.

Wherein in FIGS. 1-13: 1-outer surface semi-conducting layer, 2-insulating layer, 3-outer coil semi-conducting layer, 4-outer coil, 5-inner coil semi-conducting layer, 6-inner coil, 7-airflow channel, 8-iron core, 9-inner surface semi-conducting layer, 10-equipotential cavity, 11-equipotential body.

Detailed Description

The core of the utility model is to provide a transformer, the safety in utilization of the transformer that this application provided improves.

In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

Please refer to fig. 1 to fig. 13.

In a specific implementation manner, the utility model discloses specific embodiment provides a transformer, including iron core 8, two coil unit that arrange side by side, coil unit includes that interior coil 6 and cover establish the outer coil 4 in the interior coil 6 outside, and the parcel has outer coil semi-conducting layer 3 outside the outer coil 4. The outer side of the inner coil 6 is wrapped with an inner coil semi-conducting layer 5. The inner coil semi-conducting layer 5 can effectively improve the problem of overhigh local field strength caused by the irregular structure of the inner coil 6. Preferably, the outer semiconducting layer 3 is tangential to the outer surface of the insulating layer 2 to facilitate positioning and fixing of the part during the integral casting process.

The coil unit is integrally cast with an insulating layer 2. Wherein the transformer is bound in the cast insulation layer 2 with high electric field strength. Specifically, the insulating layer 2 is an integrally molded and cast structure, i.e., the inner coil, the outer coil semi-conductive layer 3 and the inner coil semi-conductive layer 5 are simultaneously subjected to insulating casting.

The insulating layer 2 includes a first insulating layer poured into the outer surface semiconductive layer 1, a second insulating layer poured into the outer surface semiconductive layer 1, and a third insulating layer poured onto the outer surface of the outer surface semiconductive layer 1 and the outer surface of the outer surface semiconductive layer 1. Namely, the coil of the inner coil, the coil of the outer coil and the external insulation structure are respectively cast. Preferably, the first insulating layer, the second insulating layer and the third insulating layer are made of the same material.

Because the insulating pouring material of the semi-conductive material and the insulating layer has good wettability, the field intensity can be concentrated in the insulating layer 2, and the breakdown field intensity of the general pouring material is more than 20kV/mm, so that the original secondary side distance can be effectively reduced, the power density is improved, and the magnetic leakage is reduced.

Specifically, the transformer provided by the present application may be a solid-state transformer.

Specifically, as shown in fig. 3 and 4, the outer coil 4 may be sleeved outside the inner coil 6. Alternatively, as shown in fig. 5 to 8, the inner coil 6 and the outer coil 4 may be of an upper-lower structure, and the inner coil 6 and the outer coil 4 of the upper-lower structure may be integrally cast or may be separately cast, which is illustrated in this embodiment as being separately cast.

In one embodiment, the two outer coil semiconducting layers 3 are arranged side by side, as shown in fig. 3, to facilitate positioning and fixing of the article during the integral casting process.

Specifically, as shown in fig. 2, the insulating layers 2 are cast on the inner coil semi-conductive layer 5 on the outer coil 4 side and on both the upper and lower ends of the inner coil semi-conductive layer 5. In one embodiment, an outer semiconductive layer 1 is applied on the outside of the insulating layer 2.

The inner coil 6, the inner coil semi-conducting layer 5, the outer coil 4 and the outer coil semi-conducting layer 3 are integrally formed by integral casting, and integral casting materials are filled around the materials, wherein the integral casting insulating layer 2 can be formed by one or more times of casting; the inner coil semi-conducting layer 5 and the outer surface semi-conducting layer 1 can be reliably connected with the integrally cast coil through means of spraying, dipping, pre-embedding integral casting and the like.

Specifically, the iron core 8 is installed after the inner coil 6 and the outer coil 4 are manufactured.

Preferably, the winding unit all adopts the softer material of texture, and is concrete, and interior coil semi-conducting layer 5 and outer coil semi-conducting layer 3 can be semi-conducting belt macromolecular material, and interior coil 6 and outer coil 4 can be copper wire etc. and better with the casting material infiltration nature, can not arouse too big mechanical stress concentration because of expend with heat and contract with cold at the in-process that generates heat, and then lead to the product fracture, solve the too high fracture problem that arouses of mechanical stress among the traditional direct pouring product application better.

As can be seen from the above description, in the transformer provided in the embodiment of the present application, the coil is integrally cast with the semi-conductive material, and the iron core 8 is mounted on the insulating layer 2, so as to solve the problem that the coil is cracked due to heat generated by the rigid material in the cast body. The winding is integrally poured, the mechanical stress is small, and the crack resistance can be greatly improved, so that the safety of the transformer is improved.

In one embodiment, the end of the outer surface semiconductive layer 1 is embedded inside the insulating layer 2, and the end of the outer surface semiconductive layer 1 is provided with the equipotential body 11, and the equipotential body 11 is located inside the insulating layer 2. And a semi-conductive end part structure is pre-buried, so that the electric field intensity distribution at the end part is improved. The integrally cast coil and transformer structure with the end grounding cut-off point structure is particularly characterized in that the equipotential bodies 11 are of a bell mouth structure or a circular curvature structure, and local field intensity concentration is avoided.

In one embodiment, the inner coil semiconducting layer 5 is spaced apart from the core 8 to form an air flow channel 7. The air flow channel 7 around the core 8 just penetrates the inside of the transformer, so that the coil unit and the core 8 can be well and integrally radiated, and the air flow channel 7 does not bear high field intensity because of the existence of the inner coil semi-conducting layer 5.

On the basis of the above solutions, preferably, the transformer further includes an equipotential cavity 10 fixedly connected to the insulating layer 2, and preferably, the equipotential cavity 10 and the insulating layer 2 are integrally formed, and both are integrally cast. Integrally forming an equipotential cavity 10 structure; an inner surface semi-conducting layer 9 is arranged in the equipotential cavity 10. By arranging the equipotential cavity 10, the space utilization rate is effectively improved, and the power density is improved. Through setting up equipotential cavity 10, change the requirement that traditional transformer adopted the mode of high pressure leading-out terminal to realize insulation distance, do not allow to place other article in this space, and adopt this scheme then can place the relevant electronic component of same side in equipotential cavity 10, and be unlikely to because field intensity is too big and cause device insulation failure.

In one embodiment, the iron core 8, the gap 7, the inner coil 6, the inner coil semiconducting layer 5 and the outer surface semiconducting layer 1 are on the insulating layer 2 side; and the outer coil 4, the outer coil semi-conducting layer 3, the inner surface semi-conducting layer 9 and the equipotential cavity 10 are positioned on the other side of the insulating layer 2.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a transformer, its characterized in that includes two coil units that arrange side by side, coil unit includes that interior coil (6) and cover establish outer coil (4) in interior coil (6) outside, outer coil (4) outside parcel has outer coil semi-conductive layer (3), interior coil (6) outside parcel has interior coil semi-conductive layer (5), the whole pouring of coil unit has insulating layer (2).

2. The transformer according to claim 1, characterized in that an outer surface semi-conducting layer (1) is laid outside the insulating layer (2), an end of the outer surface semi-conducting layer (1) is embedded inside the insulating layer (2), and an equal potential (11) is arranged at an end of the outer surface semi-conducting layer (1), wherein the equal potential (11) is positioned inside the insulating layer (2).

3. Transformer according to claim 2, characterized in that the equipotential body (11) is of a bell mouth or circular curvature configuration.

4. A transformer according to claim 1, further comprising a core (8), the inner coil semi-conductive layer (5) being spaced from the core (8) to form an air flow channel (7).

5. A transformer according to claim 1, characterized by further comprising an equipotential chamber (10) fixedly connected to the insulating layer (2), the equipotential chamber (10) being provided with an inner semiconducting layer (9).

6. The transformer according to claim 5, characterized in that the equipotential cavity (10), the equipotential cavity (10) and the insulating layer (2) are of an integral structure.

7. The transformer of claim 1, wherein the transformer is a solid state transformer.

8. A transformer according to claim 2 or 3, characterized in that the insulating layer (2) comprises a first insulating layer cast inside the outer surface semiconducting layer (1), a second insulating layer cast inside the outer surface semiconducting layer (1) and a third insulating layer cast on the outer surface of the outer surface semiconducting layer (1) and the outer surface of the outer surface semiconducting layer (1).

9. Transformer according to any of claims 1-7, wherein the insulating layer (2) is of an integrally cast construction.