CN112735782B

CN112735782B - Dry-type transformer that can make an uproar falls

Info

Publication number: CN112735782B
Application number: CN202011556523.6A
Authority: CN
Inventors: 王辉; 方越胜; 谢劲松; 李吉南; 张有伟; 潘镇滨
Original assignee: Ningbo Ningbian Power Technology Co ltd
Current assignee: Ningbo Ningbian Power Technology Co ltd
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2023-05-16
Anticipated expiration: 2040-12-24
Also published as: CN112735782A

Abstract

The invention discloses a dry-type transformer capable of reducing noise, which comprises a clamping piece and an iron core, wherein the iron core is formed by stacking silicon steel sheets; the side yoke of the epoxy resin coated iron core has the advantages that the side yoke of the epoxy resin coated iron core is utilized to change a part of vibration energy loss into heat energy, so that vibration of a silicon steel sheet is reduced, noise generated by the iron core is reduced, the purposes of damping vibration reduction and noise reduction are achieved, the noise reduction effect is obvious, the cost is low, in addition, the screw is added to strengthen the iron core and the clamping piece, and noise generated by self vibration during the operation of the iron core is prevented.

Description

Dry-type transformer that can make an uproar falls

Technical Field

The invention relates to the technical field of transformers, in particular to a dry-type transformer capable of reducing noise.

Background

With the rapid promotion of the construction of power transmission and transformation projects represented by extra-high voltage in China, the transformer substation is rapidly developed as a relay station for power transmission. Due to the continuous expansion of town scale in recent years, a plurality of substations are close to environmental sensitive areas such as residential living areas, schools, hospitals and the like, and the noise of the substations has a certain influence on the work and the life of surrounding residents.

The main source of the noise of the transformer iron core is that the silicon steel sheets forming the iron core can generate magnetostriction under the action of an alternating magnetic field, the magnetostriction enables the iron core to periodically vibrate along with the change of exciting frequency to generate noise, and meanwhile, electromagnetic attraction generated by magnetic leakage exists between the seam of the silicon steel sheets and the interlayer of the silicon steel sheets to generate noise when the iron core vibrates, and a noise reduction device is installed outside the transformer at present, but the noise reduction effect is not obvious by utilizing the mode, and the cost is high.

Disclosure of Invention

The invention aims to solve the technical problem of providing a dry-type transformer capable of reducing noise, which can effectively reduce the noise transmitted to the outside by a transformer core, and has the advantages of good noise reduction effect and low cost.

The technical scheme adopted for solving the technical problems is as follows: the dry-type transformer capable of reducing noise comprises a clamping piece and an iron core, wherein the iron core is formed by stacking and combining silicon steel sheets, an upper noise reduction layer is arranged on the periphery of a side yoke on the upper portion of the iron core, and the upper noise reduction layer covers a seam at the side yoke on the upper portion.

Preferably, a lower noise reduction layer is arranged on the periphery of the side yoke at the lower part of the iron core, and covers the joint at the side yoke at the lower part.

Preferably, the upper noise reduction layer and the lower noise reduction layer are made of epoxy resin.

Preferably, the thicknesses of the upper noise reduction layer and the lower noise reduction layer are respectively 10-30 mm.

Preferably, the iron core is a stepped seam iron core.

Preferably, the clamping pieces comprise upper clamping pieces clamped at two sides of an upper yoke of the iron core and lower clamping pieces clamped at two sides of a lower yoke of the iron core, the upper clamping pieces and the lower clamping pieces are respectively fixed through screw bolts, and a supporting frame is fixedly arranged at the bottom of the lower clamping pieces.

Preferably, screw connecting holes are respectively formed in the upper yoke and the lower yoke of the iron core, the screws penetrate through the screw connecting holes in the upper clamping piece and the upper yoke and are locked and fixed through nuts, and the screws penetrate through the screw connecting holes in the lower clamping piece and the lower yoke and are locked and fixed through nuts.

Compared with the prior art, the invention has the advantages that the epoxy resin is used for coating the side yoke of the iron core, part of vibration energy loss is changed into heat energy, and the vibration of the silicon steel sheet is reduced, so that the noise generated by the iron core is reduced, the purposes of damping vibration reduction and noise reduction are achieved, the noise reduction effect is obvious, the cost is lower, in addition, the screw is added to strengthen the iron core and the clamping piece, and the noise generated by self vibration of the iron core during working is prevented.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a top view of the present invention;

fig. 3 is a front view of an epoxy-coated core of the present invention.

Detailed Description

The invention is described in further detail below with reference to the embodiments of the drawings.

As shown in fig. 1-3, a dry-type transformer capable of reducing noise comprises a clamping piece and an iron core 2, wherein the iron core 2 is formed by stacking silicon steel sheets in a stepped seam mode, an upper noise reduction layer 31 formed by casting epoxy resin is arranged on the periphery of a side yoke at the upper part of the iron core 2, the upper noise reduction layer 31 covers a seam at the side yoke at the upper part of the iron core 2, a lower noise reduction layer 32 formed by casting epoxy resin is arranged on the periphery of a side yoke at the lower part of the iron core 2, the lower noise reduction layer 32 covers a seam at the side yoke at the lower part of the iron core 2, the thicknesses of the upper noise reduction layer 31 and the lower noise reduction layer 32 are respectively 10-30 mm, the epoxy resin deforms under the action of vibration, and part of vibration energy is lost into heat energy due to high internal loss of the epoxy resin, so that vibration excitation time of the silicon steel sheets can be shortened, noise generated by the silicon steel sheets is reduced, the purpose of damping noise reduction is achieved, the clamping piece comprises an upper clamping piece 11 clamped at two sides of the upper yoke 21 of the iron core 2, a lower clamping piece 12 clamped at two sides of the lower clamping piece 22 of the iron core 2, two clamping pieces 11 and two lower clamping pieces 12 are respectively fixed between two clamping pieces 13 through screws respectively.

In the above embodiment, the upper yoke 21 of the iron core 2 and the lower yoke 22 of the iron core 2 may be further provided with screw connecting holes 23, the screw 13 passes through the screw connecting holes 23 on the upper clamp 11 and the upper yoke 21 and is locked and fixed by nuts 24, the screw 13 passes through the screw connecting holes 23 on the lower clamp 12 and the lower yoke 22 and is locked and fixed by nuts 24, the screw 13 is further added on the basis of the original fixing structure of the clamp, and the screw 13 passes through the upper yoke 21 and the lower yoke 22 to fix the clamp and the iron core 2, so that the connection between the iron core 2 and the clamp is further reinforced, the iron core 2 is prevented from self-vibration and noise due to loosening in the working process, and the support frame 4 is fixedly arranged at the bottom of the lower clamp 12.

The scope of the present invention includes, but is not limited to, the above embodiments, and any alterations, modifications, and improvements made by those skilled in the art are intended to fall within the scope of the invention.

Claims

1. The utility model provides a dry-type transformer that can make an uproar, includes folder and iron core, the iron core by silicon steel sheet range upon range of combination, its characterized in that: the periphery of the side yoke on the upper portion of the iron core is provided with an upper noise reduction layer, the upper noise reduction layer covers the joint of the side yoke on the upper portion, the periphery of the side yoke on the lower portion of the iron core is provided with a lower noise reduction layer, the lower noise reduction layer covers the joint of the side yoke on the lower portion, and the thicknesses of the upper noise reduction layer and the lower noise reduction layer are respectively 10-30 mm.

2. The noise-reducible dry transformer of claim 1, wherein: the upper noise reduction layer and the lower noise reduction layer are made of epoxy resin.

3. The noise-reducible dry transformer of claim 1, wherein: the iron core is a stepped seam iron core.

4. The noise-reducible dry transformer of claim 1, wherein: the clamping pieces comprise upper clamping pieces clamped on two sides of an upper yoke of the iron core and lower clamping pieces clamped on two sides of a lower yoke of the iron core, the upper clamping pieces and the lower clamping pieces are respectively fixed through screws, and a supporting frame is fixedly arranged at the bottom of the lower clamping pieces.

5. The noise-reducible dry transformer of claim 4, wherein: the upper yoke of the iron core and the lower yoke of the iron core are respectively provided with a screw rod connecting hole, the screw rods penetrate through the screw rod connecting holes on the upper clamping piece and the upper yoke and are locked and fixed through nuts, and the screw rods penetrate through the screw rod connecting holes on the lower clamping piece and the lower yoke and are locked and fixed through the nuts.