CN210640103U

CN210640103U - Oil-immersed transformer beneficial to heat dissipation of iron core

Info

Publication number: CN210640103U
Application number: CN201921198165.9U
Authority: CN
Inventors: 马付印
Original assignee: Jiangsu Xingchi Transformer Co Ltd
Current assignee: Jiangsu Xingchi Transformer Co Ltd
Priority date: 2019-07-29
Filing date: 2019-07-29
Publication date: 2020-05-29
Anticipated expiration: 2029-07-29

Abstract

The utility model discloses an oil immersion type transformer beneficial to heat dissipation of an iron core, which comprises a transformer shell, the iron core, a low-voltage winding, a high-voltage winding, a heat conducting pad and an oil pipe, wherein the iron core is arranged at the middle position inside the transformer shell, the low-voltage winding is wrapped outside the iron core, the high-voltage winding is wrapped outside the low-voltage winding, an oil duct is arranged between the low-voltage winding and the high-voltage winding, the oil pipe is arranged at both sides outside the transformer shell, the oil pipe is communicated with the transformer shell, the heat conducting pad is respectively filled between the upper end and the lower end of the iron core and the top and the bottom of the transformer shell and is fully contacted and fixed by a bolt with a sealing ring, the utility model has reasonable structure, the heat generated by the iron core is directly and rapidly transferred to the transformer shell through the heat conducting pad, and the, the overall heat dissipation effect is increased.

Description

Oil-immersed transformer beneficial to heat dissipation of iron core

Technical Field

The utility model relates to an oil-immersed transformer technical field specifically is a be favorable to iron core heat dissipation oil-immersed transformer.

Background

Distribution transformers are one of the important devices in industrial and mining enterprises and civil building power supply and distribution systems, and reduce 10 (6) kV or 35kV network voltage to 230/400V bus voltage used by users. The product is suitable for alternating current 50 (60) Hz, three-phase maximum rated capacity 2500kVA (single-phase maximum rated capacity 833kVA, generally, a single-phase transformer is not recommended), can be used indoors or outdoors, and can be arranged on a pole when the capacity is 315kVA or below.

The existing oil-immersed self-cooling transformer comprises a transformer shell, an iron core, a low-voltage winding, a high-voltage winding and the like. The transformer shell is generally made of metal materials with good heat conductivity, heat can be dissipated well, and the shell needs to be grounded for safety. The iron core is made of silicon steel sheets in a laminated mode, so that high magnetic induction intensity can be obtained, eddy current can be reduced, and in order to eliminate the suspension voltage of the iron core to the ground without forming circulating current, only one point on the iron core is connected with a transformer shell (grounded). In order to avoid circulation, eddy current and safety, the iron core cannot be in direct contact with the housing to facilitate heat dissipation, and the iron core in the oil-immersed self-cooling transformer can only dissipate heat through the circulation of transformer oil, so an improved technology is urgently needed to solve the problem in the prior art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a be favorable to iron core heat dissipation oil-immersed transformer to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a be favorable to iron core heat dissipation oil to soak formula transformer, includes transformer housing, iron core, low voltage winding, high voltage winding, heat conduction pad and oil pipe, the inside intermediate position of transformer housing is provided with the iron core, the iron core outside parcel has low voltage winding, the outside parcel of low voltage winding has high voltage winding, be provided with the oil duct between low voltage winding and the high voltage winding, the outside both sides of transformer housing all are provided with oil pipe, oil pipe is linked together with transformer housing, it has heat conduction pad and abundant contact and by the bolt fastening of taking the sealing washer to fill respectively between iron core upper end and lower extreme and transformer housing top and the bottom.

Preferably, the heat conducting pad comprises an inner core material and a covering layer, the covering layer is coated on the outer portion of the inner core material, bolt passages are formed in the inner core material and the covering layer, beryllium oxide ceramic material is arranged in the inner core material heat conducting pad, and the covering layer is epoxy resin mixed with beryllium oxide.

Preferably, the iron core is formed by laminating a plurality of layers of steel sheets, and screw holes are formed in the end portions of the iron core.

Preferably, the transformer housing is made of a metal material, and the transformer housing is grounded.

Preferably, the transformer housing is filled with transformer oil.

Preferably, the oil pipes are of a loop structure, and an oil pump is connected to any one of the oil pipes.

Compared with the prior art, the beneficial effects of the utility model are that:

the heat that the iron core produced directly transmits the heat for the transformer shell rapidly through the heat conduction pad, again because the heat conduction pad comprises insulating material, can not produce vortex etc. and produce new burden to the transformer, reaches the heat dissipation burden that alleviates transformer oil, has increased holistic radiating effect.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of a thermal pad structure.

In the figure: 1. a transformer housing; 2. an iron core; 3. a low voltage winding; 4. a high voltage winding; 5. a thermally conductive pad; 6. an oil pipe; 61. an inner core material; 62. and (4) a covering layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: an oil immersed transformer beneficial to heat dissipation of an iron core comprises a transformer shell 1, an iron core 2, a low-voltage winding 3, a high-voltage winding 4, a heat conducting pad 5 and oil pipes 6, wherein the transformer shell 1 is made of metal materials, the transformer shell 1 is grounded, the iron core 2 is arranged in the middle of the inside of the transformer shell 1, the iron core 2 is formed by laminating a plurality of steel sheets, screw holes are formed in the end part of the iron core 2, the low-voltage winding 3 is wrapped on the outer side of the iron core 2, the high-voltage winding 4 is wrapped on the outer side of the low-voltage winding 3, an oil duct is arranged between the low-voltage winding 3 and the high-voltage winding 4, the oil pipes 6 are arranged on the two sides of the outside of the transformer shell 1, the oil pipes 6 are communicated with the transformer shell 1, the oil pumps are connected on any one of the oil pipes 6, the heat conducting, the bolt penetrates through the heat conducting pad 5 to be connected with the screw hole at the end part of the iron core 2, and the transformer oil is filled in the transformer shell 1.

As shown in fig. 2, the thermal pad 5 includes an inner core 61 and a covering layer 62, the covering layer 62 is coated on the outer portion of the inner core 61, bolt passages are provided in both the inner core 61 and the covering layer 62, the inner portion of the inner core 61 is beryllium oxide ceramic material, and the covering layer 62 is beryllium oxide-mixed epoxy resin.

The use principle is as follows: the lower end and the upper end of the iron core 2 are respectively filled with the heat conducting pad 5 between the bottom and the top of the transformer shell 1 and are fully contacted, the material used by the heat conducting pad 5 has insulating high heat conducting performance, the heat conducting pad 5 is mainly made of beryllium oxide ceramic material, the surface of the heat conducting pad 5 is covered by a material with stable chemical properties, the covering layer 62 is epoxy resin mixed with beryllium oxide, the beryllium oxide material is prevented from being directly contacted with some gases generated during the working of the transformer to react, when the transformer works, the high-low voltage winding 3 generates heat due to the existence of current, the iron core 2 generates heat due to eddy current in silicon steel sheets, on one hand, the heat can be transferred to transformer oil contacted with the heat conducting pad, and the flow of the transformer oil transfers the heat to the transformer shell 1 with lower temperature and some heat dissipation components to. On the other hand, the heat generated by the iron core 2 is directly and rapidly transferred to the transformer shell 1 through the heat conducting pad 5, and the heat conducting pad 5 is made of insulating materials, so that new burden on the transformer caused by eddy current and the like can not be generated, the heat dissipation burden of transformer oil is reduced, and the whole heat dissipation effect is increased.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a be favorable to iron core heat dissipation oil to soak formula transformer which characterized in that: including transformer housing (1), iron core (2), low voltage winding (3), high voltage winding (4), heat conduction pad (5) and oil pipe (6), transformer housing (1) inside intermediate position is provided with iron core (2), iron core (2) outside parcel has low voltage winding (3), low voltage winding (3) outside parcel has high voltage winding (4), be provided with the oil duct between low voltage winding (3) and high voltage winding (4), transformer housing (1) outside both sides all are provided with oil pipe (6), oil pipe (6) are linked together with transformer housing (1), it has heat conduction pad (5) and abundant contact and is fixed by the bolt of taking the sealing washer to fill respectively between iron core (2) upper end and lower extreme and transformer housing (1) top and the bottom.

2. The transformer of claim 1, wherein the transformer further comprises: the heat-conducting pad (5) comprises an inner layer core material (61) and a covering layer (62), the covering layer (62) is coated on the outer portion of the inner layer core material (61), bolt channels are arranged in the inner layer core material (61) and the covering layer (62), and beryllium oxide ceramic materials are arranged in the inner layer core material (61) and the heat-conducting pad (5).

3. The transformer of claim 1, wherein the transformer further comprises: the iron core (2) is formed by laminating a plurality of layers of steel sheets, and screw holes are formed in the end portion of the iron core (2).

4. The transformer of claim 1, wherein the transformer further comprises: the transformer shell (1) is made of metal materials, and the transformer shell (1) is grounded.

5. The transformer of claim 1, wherein the transformer further comprises: the transformer shell (1) is filled with transformer oil.

6. The transformer of claim 1, wherein the transformer further comprises: the oil pipes (6) are of a loop structure, and any one of the oil pipes (6) is connected with an oil pump.