CN116564674A

CN116564674A - Electric furnace transformer

Info

Publication number: CN116564674A
Application number: CN202310547689.9A
Authority: CN
Inventors: 张涛; 范景帅; 杨红卫; 黄磊
Original assignee: Henan Longxiang Electric Co ltd
Current assignee: Henan Longxiang Electric Co ltd
Priority date: 2023-05-15
Filing date: 2023-05-15
Publication date: 2023-08-08

Abstract

The invention relates to an electric furnace transformer, which comprises an iron core, an upper clamping piece and a lower clamping piece, wherein a primary winding and a secondary winding are sleeved on the iron core; the secondary winding comprises a plurality of layers of copper foils which are stacked together, the electric furnace transformer comprises insulating pressing parts positioned at the upper end and the lower end of the plurality of layers of copper foils, and clamping grooves which are adaptively clamped at the two ends of the plurality of layers of copper foils are arranged on the insulating pressing parts; the upper clamping piece and the lower clamping piece are used for jacking the corresponding insulating pressing parts along the up-down direction so as to clamp the multi-layer copper foil up and down through the insulating pressing parts. The multi-layer copper foil is used as a secondary winding, so that the current carrying capacity is stronger, and the use requirement of the electric furnace transformer for outputting larger current can be met. The clamping groove in the insulating pressing part can restrict and limit the multi-layer copper foil, and the copper foil is prevented from being scattered. The upper clip member and the lower clip member clamp the copper foil in the up-down direction by pressing the insulating pressing member on the corresponding sides. The insulating pressing part is made of insulating materials, and can ensure the insulativity between the upper clamping piece and the copper foil and between the lower clamping piece and the copper foil.

Description

Electric furnace transformer

Technical Field

The invention relates to the technical field of transformers, in particular to an electric furnace transformer.

Background

The transformer is an important device in power generation, power supply and power utilization enterprises, is in a very critical position in a power grid, and is an important device for ensuring safe and reliable operation of the power grid. Electric furnace transformers are transformers dedicated to supplying power to various electric furnaces, and can be broadly classified into 3 types: electric furnace transformers in the market are mostly classified into oil immersed electric furnace transformers and dry electric furnace transformers. Because of the heating material of the electric furnace, the voltage output by the secondary side of the electric furnace transformer is generally low, and the output current is large.

The general structure of the electric furnace transformer is mostly as shown in the patent application of the application publication number CN112652441A, and the electric furnace transformer comprises a core, an upper clamping piece, a lower clamping piece, a primary winding and a secondary winding, wherein the primary winding and the secondary winding are sleeved outside the core and clamped by the upper clamping piece and the lower clamping piece. The transformer comprises an iron core, an upper clamping piece, a lower clamping piece, a primary winding, a secondary winding and a low-voltage winding, wherein the iron core is a transformer iron core in the patent application, the upper clamping piece is an upper base in the patent application, the lower clamping piece is a lower base in the patent application, the primary winding is a high-voltage coil in the patent application, and the secondary winding is a low-voltage coil in the patent application.

In the prior art, the primary winding and the secondary winding are usually formed by enameled wires wound on an iron core, and the wiring terminals of the primary winding and the secondary winding are used for connecting structures such as conductive terminals, so that wiring is completed. However, the current carrying capacity of the enameled wire is poor, and the current output by the secondary side of the electric furnace transformer is large, so that the secondary winding formed by winding the enameled wire cannot meet the use requirement.

Disclosure of Invention

The invention provides an electric furnace transformer, which aims to solve the technical problem that the current carrying capacity of a secondary winding in the prior art is poor and the use requirement of high output current of the electric furnace transformer cannot be met.

In order to solve the problems, the electric furnace transformer provided by the invention adopts the following technical scheme: an electric furnace transformer comprising:

the iron core, the upper clamping piece and the lower clamping piece are sleeved with a primary winding and a secondary winding;

the secondary winding comprises a plurality of layers of copper foils which are stacked together, the electric furnace transformer comprises insulating pressing parts positioned at the upper end and the lower end of the plurality of layers of copper foils, and clamping grooves which are adaptively clamped at the two ends of the plurality of layers of copper foils are formed in the insulating pressing parts;

the upper clamping piece and the lower clamping piece are used for jacking the corresponding insulating pressing parts along the up-down direction so as to clamp the multi-layer copper foil up and down through the insulating pressing parts.

The beneficial effects are that: the multi-layer copper foil is used as a secondary winding, so that the current carrying capacity is stronger, and the use requirement of the electric furnace transformer for outputting larger current can be met. The clamping grooves in the insulating pressing part can be adaptively clamped on two sides of the multilayer copper foil, so that the multilayer copper foil is restrained and limited, and the copper foil is prevented from being scattered. The upper clip member and the lower clip member press the copper foil in the up-down direction by pressing the insulating pressing member on the corresponding side, and the copper foil can be held in a set position. Because the insulating pressing part is made of insulating materials, the insulativity between the upper clamping piece and the copper foil and between the lower clamping piece and the copper foil can be ensured. The multi-layer copper foil is bent to form the secondary winding, and the single-layer copper foil is easier to bend during processing, so that the processing is more convenient.

As a further optimization, the insulating compressing component at least comprises a plurality of insulating compressing blocks, and the clamping grooves are formed in the insulating compressing blocks; the plurality of insulating compaction blocks are sequentially arranged along the horizontal extending direction of the copper foil. The insulating compaction part includes a plurality of insulating compaction blocks, compares a monoblock insulating compaction part, and insulating compaction block all has advantages in processing, equipment convenience, easily carries out the individual change moreover. The plurality of insulating compaction blocks are sequentially arranged along the horizontal extending direction of the copper foil, so that the uniformity and consistency of jacking pressure of the copper foil at all positions are ensured.

As a further refinement, the secondary winding is arranged outside the primary winding, and the insulating pressing part has a side wall which is arranged between the primary winding and the secondary winding on the side of the clamping groove and is used for separating the primary winding and the secondary winding. The clamping groove is formed in the insulating pressing component, the side wall is formed naturally, meanwhile, the side wall is located between the primary winding and the secondary winding, the primary winding and the secondary winding can be separated due to the insulativity of the insulating pressing component, the insulating pressing component plays a role in pressing multiple layers of copper foils, plays a role in separating the primary winding and the secondary winding, and functions are more concentrated.

As a further optimization, the insulating pressing members have pressing edges extending toward the direction in which the primary winding is located, the pressing edges being for pressing against the respective ends of the primary winding in the up-down direction, the pressing edges of the two insulating pressing members together clamping the primary winding in the up-down direction. The pressing edges on the two insulating pressing parts can clamp the primary winding together, that is, the insulating pressing parts play a role in pressing multiple layers of copper foils, separate the primary winding from the secondary winding, and simultaneously play a role in pressing the primary winding, so that the insulating pressing parts are highly integrated with multiple functions, do not need more parts, and have fewer parts.

As a further optimization, a horizontal gap is arranged between the insulating pressing part and the iron core, so that air can flow through the horizontal gap to dissipate heat. The horizontal gap ensures that air can pass through, prevents the existence of the insulating pressing part from obstructing air flow, and ensures the heat dissipation effect.

As a further optimization, the primary winding is provided with two wiring ends, and the two wiring ends are fixedly provided with low-voltage conductive bars; the upper clamping piece and the lower clamping piece are respectively provided with a low-voltage outlet fixing clamp, and the low-voltage outlet fixing clamps of the upper clamping piece and the lower clamping piece clamp the low-voltage conductive bars up and down together. The low-voltage conducting bar is clamped by the low-voltage outgoing line fixing clamp, so that the position of the low-voltage conducting bar can be restrained and fixed.

As a further optimization, a limiting groove is formed in one side, facing the low-voltage conducting bar, of the low-voltage outlet fixing clamp, and the low-voltage conducting bar extends into the limiting groove of the low-voltage outlet fixing clamp at the corresponding side. The cell wall of spacing groove can block the cooperation with the low-voltage conductive bar to restrict the position of low-voltage conductive bar, the position of low-voltage conductive bar is more accurate, conveniently wiring on the low-voltage conductive bar.

As a further optimization, at least two secondary windings are stacked up and down, any two adjacent secondary windings share one insulating and compressing component, and the clamping grooves are formed in the upper side and the lower side of the insulating and compressing component between the two secondary windings. Two adjacent secondary windings share one insulating and compressing component, so that the number of the insulating and compressing components can be saved, and compared with a mode that the two insulating and compressing components are in direct contact, the two adjacent secondary windings share one insulating and compressing component, so that mutual movement between the two insulating and compressing components in contact in the horizontal direction is avoided.

As a further optimization, the insulating pressing part is an epoxy insulating pressing part.

As a further optimization, the iron core is an amorphous alloy iron core.

Drawings

The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings, embodiments of the invention are illustrated by way of example and not by way of limitation, and like reference numerals refer to similar or corresponding parts and in which:

FIG. 1 is a front view of an electric furnace transformer;

FIG. 2 is a rear view of the electric furnace transformer;

FIG. 3 is a top view of an electric furnace transformer;

FIG. 4 is a left side view of the electric furnace transformer;

FIG. 5 is a front view of a lower clamp in an electric furnace transformer;

FIG. 6 is a top view of a lower clamp in an electric furnace transformer;

FIG. 7 is a front view of an upper clamp in an electric furnace transformer;

FIG. 8 is a top view of an upper clamp in an electric furnace transformer;

FIG. 9 is a front view of an epoxy block in the electric furnace transformer;

FIG. 10 is a front view of a low voltage outlet retention clip in an electric furnace transformer;

fig. 11 is a schematic diagram of the structure of a secondary winding in an electric furnace transformer.

Reference numerals illustrate:

1. a core; 2. an upper clamping piece; 3. a lower clamping piece; 4. a pull rod; 5. a primary winding; 6. a secondary winding; 61. a first connection hole; 7. an epoxy resin block; 71. a clamping groove; 72. a first sidewall; 73. a second sidewall; 74. pressing the edges; 8. a low voltage conductor bar; 9. a low voltage outlet fixing clip; 91. a limit groove; 10. a low voltage lead frame; 11. a high-voltage wiring board; 12. a high voltage lead frame; 13. a lower clip body; 14. punching a pull rod; 15. an upper clip body; 16. and (5) hanging rings.

Detailed Description

The following description of the embodiments of the present invention will be made more complete and clear to those skilled in the art by reference to the figures of the embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Aiming at the problem of poor current carrying capacity of the secondary winding of the electric furnace transformer in the prior art, the invention uses stacked multi-layer copper foils as the secondary winding, and can improve the current carrying capacity. In order to clamp and fix the multi-layer copper foil, the clamping grooves in the insulating pressing parts at the upper end and the lower end are used for horizontally restraining to prevent the copper foil from scattering, and meanwhile, the upper clamping piece and the lower clamping piece are used for pressing the multi-layer copper foil up and down through the jacking of the insulating pressing parts, so that the accuracy of the positions of the multi-layer copper foil is ensured, and the use requirements of insulation and the like are met.

Having described the basic principles of the present invention, various non-limiting embodiments of the invention are described in detail below. Any number of elements in the figures are for illustration and not limitation, and any naming is used for distinction only and not for any limiting sense.

The principles and spirit of the present invention are explained in detail below with reference to several representative embodiments thereof.

Example 1 of an electric furnace transformer provided by the invention:

as shown in fig. 1 to 11, the electric furnace transformer of the present embodiment is a single-phase dry amorphous alloy iron core electric furnace transformer, and the electric furnace transformer includes an iron core 1, an upper clamp 2, a lower clamp 3, a primary winding 5, and a secondary winding 6, wherein the primary winding 5 and the secondary winding 6 are sleeved on the iron core 1, the primary winding 5 is included, the secondary winding 6 is sleeved outside the primary winding 5, the primary winding 5 of the electric furnace transformer is a high-voltage winding, and the secondary winding 6 is a low-voltage winding.

The iron cores 1 are amorphous alloy iron cores, two iron cores 1 are arranged side by side, a primary winding 5 and a secondary winding 6 are sleeved on the two iron cores 1 at the same time, and the primary winding 5 is formed by winding enameled wires. The secondary winding 6 has a structure shown in fig. 11, and the secondary winding 6 includes a plurality of layers of copper foils stacked together, each of the copper foils being bent into a semi-annular structure having one side open, the plurality of layers of copper foils being stacked together in the thickness direction of the copper foil. The multi-layer copper foil has strong current carrying capacity and can meet the use requirement of secondary side high current of an electric furnace transformer.

To hold each copper foil to prevent the copper foil from scattering, as shown in fig. 1 to 4, the upper and lower ends of the secondary winding 6 are respectively provided with an insulating pressing member including a plurality of epoxy resin blocks 7 arranged along the extending direction of the copper foil with spaces between each epoxy resin block 7. As shown in fig. 9, the structure of the epoxy resin block 7 is such that a clamping groove 71 is provided on one side of the epoxy resin block 7 facing the copper foil in the vertical direction, the clamping groove 71 is adapted to be clamped on both sides of each copper foil, and a first side wall 72 and a second side wall 73 are formed on both sides of the clamping groove 71 on one side of the epoxy resin block 7. Adaptation here refers to: preferably, the slot width of the slot 71 is equal to the sum of the thicknesses of the respective copper foils in the secondary winding 6, so that the slot 71 can be exactly caught on the outside of the respective copper foils, preventing the copper foils from being scattered. Of course, in practical use, the slot width of the slot 71 is usually slightly larger than the sum of the thicknesses of the copper foils in the secondary winding, so that the clamping is convenient and the copper foils can be prevented from being scattered.

As shown in fig. 9, the epoxy block 7 further has a pressing edge 74 extending toward the direction in which the first side wall 72 is located, the pressing edge 74 serving to press the primary winding 5. It should be noted that the epoxy resin block 7 is of an integral structure, and in this embodiment, the division is made only by the difference in the functions of the respective portions.

In this embodiment, the epoxy resin block 7 does not contact the core 1, that is, there is a horizontal gap between the epoxy resin block 7 and the core 1, and the horizontal gap is used for air to flow therethrough to dissipate heat, so that the air flow is prevented from being affected by the addition of the epoxy resin block 7.

As shown in fig. 1 to 4, when assembling, the primary winding 5 is wound around the core 1, the secondary winding 6 is wound around the primary winding 5, and the locking grooves 71 of the epoxy resin blocks 7 are locked to the upper and lower sides of the secondary winding 6. The first side wall 72 is located between the primary winding 5 and the secondary winding 6 and serves to separate the primary winding 5 from the secondary winding 6. When assembled, the pressing edge 74 of the top epoxy resin block 7 presses against the top of the primary winding 5, and the pressing edge 74 of the bottom epoxy resin block 7 presses against the bottom of the primary winding 5. The upper clamping piece 2 is propped against the epoxy resin block 7 at the top, the lower clamping piece 3 is propped against the epoxy resin block 7 at the bottom, and the upper clamping piece 2 and the lower clamping piece 3 can clamp the primary winding 5 and the secondary winding 6 up and down after being tensioned through the pull rod 4. It should be noted that, in actual use, the upper clamping piece 2 and the lower clamping piece 3 can be directly propped against the epoxy resin block 7, or insulating cushion blocks can be added between the upper clamping piece 2 and the epoxy resin block 7 and between the lower clamping piece 3 and the epoxy resin block 7, so that the upper clamping piece 2 and the lower clamping piece 3 are indirectly propped against the epoxy resin block 7.

As shown in fig. 11, the terminals of the secondary winding 6 have first connection holes 61 penetrating each copper foil. The electric furnace transformer further comprises two low-voltage conducting bars 8, second connecting holes connected with the secondary winding 6 are formed in the low-voltage conducting bars 8, the number of the first connecting holes 61 and the number of the second connecting holes are equal and correspond to each other one by one, the low-voltage conducting bars 8 are fixedly installed on the wiring ends of the secondary winding 6 through bolts during assembly, specifically, the bolts penetrate through the first connecting holes 61 and the second connecting holes, nuts are rotated on the bolts, and therefore the low-voltage conducting bars 8 are pressed and fixed on the wiring ends of the secondary winding 6, and meanwhile reliable conductive connection between the low-voltage conducting bars 8 and the secondary winding 6 is guaranteed. The other side of the low-voltage conductive bar 8 is provided with a wiring hole for low-voltage wiring.

As shown in fig. 7 and 8, the upper clamp 2 includes an upper clamp body 15, a high voltage lead frame 12 is fixedly installed on one side of a high voltage outlet in the upper clamp body 15, and a high voltage wiring board 11 is fixedly installed on the high voltage lead frame 12, where the high voltage wiring board 11 is an insulating material, for example, the high voltage wiring board 11 may be a wood board. A terminal lug is fixed to the terminal end of the primary winding 5, and the terminal lug is fixed to the high-voltage wiring board 11. A low voltage lead frame 10 is fixedly installed at one side of the low voltage outlet in the upper clip body 15, a low voltage outlet fixing clip 9 is fixed on the low voltage lead frame 10, specifically, the low voltage lead frame 10 is arranged to be overhanging in the horizontal direction, and two low voltage lead frames 10 are arranged in the horizontal direction, and the low voltage outlet fixing clip 9 is fixed on the two low voltage lead frames 10. As shown in fig. 10, the structure of the low-voltage outlet fixing clip 9 is that the low-voltage outlet fixing clip 9 has a plate-like structure as a whole, bolt through holes are formed at two ends of the low-voltage outlet fixing clip 9, and a limit groove 91 is formed on one side plate surface of the low-voltage outlet fixing clip 9. As shown in fig. 3 and 4, during assembly, the low-voltage outlet fixing clip 9 is fixedly mounted on the low-voltage lead frame 10, the low-voltage conductor 8 extends into the limit groove 91 of the low-voltage outlet fixing clip 9, and the limit groove 91 can limit the position of the low-voltage conductor 8. The low voltage outlet fixing clip 9 is made of an insulating material, in this embodiment a wood board.

As shown in fig. 7, a hanging ring 16 is fixedly installed at the top of the upper clamping member main body 15, and the hanging ring 16 is used for hanging a hook and the like to realize hanging.

The structure of the lower clamp 3 is as shown in fig. 5 and 6, the structure of the lower clamp 3 is similar to that of the upper clamp 2, the lower clamp 3 comprises a lower clamp main body 13, a low-voltage lead bracket 10 is fixed on the lower clamp main body 13, a low-voltage lead fixing clamp 9 is also mounted on the low-voltage lead bracket 10 of the lower clamp 3, and the low-voltage lead fixing clamps 9 in the upper clamp 2 and the lower clamp 3 clamp the two low-voltage conductive bars 8 together.

The upper clamping piece 2 and the lower clamping piece 3 are respectively provided with a pull rod perforation 14, the pull rod 4 passes through the pull rod perforation 14, nuts are screwed at two ends of the pull rod 4, the upper clamping piece 2 and the lower clamping piece 3 are tensioned through the nuts at two ends of the pull rod 4, and the upper clamping piece 2 and the lower clamping piece 3 clamp the primary winding 5 and the secondary winding 6 through the epoxy resin blocks 7 at the upper end and the lower end.

In the invention, the secondary winding 6 is formed by using a plurality of layers of copper foils, the current carrying capacity of the secondary winding 6 is improved by using the characteristics of low resistance and low heat generation quantity of the copper foils, and the use requirement of secondary side high current of the electric furnace transformer is met.

In this embodiment, the epoxy resin block 7 is made of an insulating material, and is provided with a clamping groove 71, meanwhile, the epoxy resin block 7 has a pressing edge 74 pressed on the primary winding 5, the epoxy resin block 7 plays a role in clamping multiple layers of copper foils to prevent the copper foils from being scattered, the first side wall 72 on the epoxy resin block 7 also plays a role in separating the primary winding 5 from the secondary winding 6, and meanwhile, the pressing edge 74 can also press the primary winding 5, so that multiple functions are integrated, the number of parts is reduced, and the assembly is convenient. The epoxy resin block 7 constitutes an insulating compression block which is caught at the end of the multi-layered copper foil.

In this embodiment, the plurality of epoxy resin blocks 7 located on the same side of the primary winding 5 form an insulating compression component together, the plurality of epoxy resin blocks 7 are sequentially arranged along the extending direction of the copper foil and are spaced from each other, and after assembly, the jacking force of each epoxy resin block 7 on the primary winding 5 is more uniform, so that the stress deformation of the copper foil caused by serious local compression is avoided. Since the epoxy resin block 7 is an insulating material, the insulating pressing member forms an epoxy resin insulating pressing member.

Example 2 of the electric furnace transformer provided by the invention:

the differences from example 1 are mainly that: in embodiment 1, the iron core is an amorphous alloy iron core, and the amorphous alloy iron core has the greatest advantage of low no-load loss value.

In the present embodiment, the core may be in other forms, such as a conventional silicon steel sheet core, or the like.

Example 3 of the electric furnace transformer provided by the invention:

the differences from example 1 are mainly that: in embodiment 1, the insulating pressing member is an epoxy resin insulating pressing member including a plurality of epoxy resin blocks sequentially arranged along a horizontal extending direction of the copper foil.

In this embodiment, the material of the insulating compression block may be changed, for example, a wood block. In other embodiments, the insulating pressing member is a strip-shaped block, the strip-shaped block extends horizontally along the copper foil, and a clamping groove is formed in one side of the strip-shaped block, wherein the clamping groove is a long groove. When in use, the strip-shaped blocks are clamped together at the end parts of the multi-layer copper foil. The strip-shaped block may have inconvenience in mounting compared to the form of a plurality of insulating pressing blocks in embodiment 1, but the clamping effect on the copper foil is better because the strip-shaped block is continuously extended.

In the concrete assembly process, only one insulating compression part at one end of the multilayer copper foil can be designed into a strip-shaped block, and a plurality of insulating compression blocks are reserved at the other end; the insulating pressing parts at the two ends of the multilayer copper foil can also be designed into long strip-shaped blocks.

Example 4 of an electric furnace transformer provided by the invention:

the differences from example 1 are mainly that: in example 1, one secondary winding is provided, and both ends of the secondary winding are provided with insulating pressing members.

In this embodiment, after the voltage level is increased, the secondary windings may be sequentially arranged in the up-down direction, and at this time, in order to clamp each secondary winding up and down, insulating compression members are required to be disposed at the upper and lower ends of the secondary windings, so as to save the number of insulating compression members, and simultaneously, in order to prevent mutual play between two adjacent secondary windings. Two adjacent secondary windings share the same insulating and compressing component, and clamping grooves are formed in the upper side and the lower side of the insulating and compressing component.

Example 5 of the electric furnace transformer provided by the invention:

the differences from example 1 are mainly that: in embodiment 1, a limit groove is formed in the low-voltage outlet fixing clamp, and the low-voltage conductive bar extends into the limit groove and is limited by the limit groove.

In this embodiment, the limiting groove, that is, the side surface of the low-voltage outlet fixing clamp for clamping the low-voltage conductive bar is a plane, and the low-voltage conductive bar is clamped by means of the plane.

Example 6 of an electric furnace transformer provided by the invention:

the differences from example 1 are mainly that: in embodiment 1, a low voltage outlet fixing clip is provided on both the upper clip member and the lower clip member, and the low voltage outlet fixing clip is used to clamp the low voltage conductor bar.

In this embodiment, the low voltage outlet retention clip is eliminated, i.e., the low voltage conductor bar is no longer clipped, and its position is maintained solely by virtue of its connection to the copper foil.

Example 7 of an electric furnace transformer provided by the invention:

the differences from example 1 are mainly that: in embodiment 1, the insulating pressing member has a pressing edge for pressing the primary winding.

In this embodiment, the pressing edge is omitted, and in order to press the primary winding, a conventional pad form may be adopted, that is, a pad is disposed between the upper clamping member and the primary winding, and between the lower clamping member and the primary winding to achieve pressing and insulation. At this time, the insulating pressing member only plays a role of pressing the copper foil and separating the primary winding from the secondary winding.

Example 8 of an electric furnace transformer provided by the invention:

the differences from example 1 are mainly that: in embodiment 1, the secondary winding is sleeved outside the primary winding, and the side wall of the insulating pressing member is located between the primary winding and the secondary winding, so that the primary winding and the secondary winding can be separated.

In this embodiment, the primary winding and the secondary winding are both sleeved outside the core, but the primary winding and the secondary winding are arranged up and down, and at this time, the side wall in the insulating pressing member is no longer located between the primary winding and the secondary winding, and does not play a role in separating the primary winding and the secondary winding.

From the foregoing description of the present specification, it will be further understood by those skilled in the art that terms such as "upper", "lower", "front", "rear", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer", and the like, which indicate an azimuth or a positional relationship, are based on the azimuth or the positional relationship shown in the drawings of the present specification, are for convenience only in explaining aspects of the present invention and simplifying the description, and do not explicitly or implicitly refer to devices or elements having to have the specific azimuth, be constructed and operate in the specific azimuth, and thus the azimuth or positional relationship terms described above should not be interpreted or construed as limitations of aspects of the present invention.

In addition, in the description of the present specification, the meaning of "plurality" means at least two, for example, two, three or more, etc., unless specifically defined otherwise.

Claims

1. An electric furnace transformer comprising:

the iron core (1), the upper clamping piece (2) and the lower clamping piece (3), wherein a primary winding (5) and a secondary winding (6) are sleeved on the iron core (1);

it is characterized in that the method comprises the steps of,

the secondary winding (6) comprises a plurality of layers of copper foils which are stacked together, the electric furnace transformer comprises insulating pressing parts which are positioned at the upper end and the lower end of the plurality of layers of copper foils, and clamping grooves (71) which are adaptively clamped at the two ends of the plurality of layers of copper foils are formed in the insulating pressing parts;

the upper clamping piece (2) and the lower clamping piece (3) are used for jacking corresponding insulating pressing parts along the up-down direction so as to clamp the multi-layer copper foil up and down through the insulating pressing parts.

2. An electric furnace transformer according to claim 1, characterized in that the insulating hold-down member of at least one end comprises a plurality of insulating hold-down blocks, each of which is provided with the clamping groove (71); the plurality of insulating compaction blocks are sequentially arranged along the horizontal extending direction of the copper foil.

3. An electric furnace transformer according to claim 1, characterized in that the secondary winding (6) is sleeved outside the primary winding (5), and that the insulating hold-down member has a side wall located on the side of the clamping groove (71) and arranged between the primary winding (5) and the secondary winding (6), the side wall being used for separating the primary winding (5) and the secondary winding (6).

4. An electric furnace transformer according to claim 3, characterized in that the insulating hold-down members have hold-down edges (74) extending in the direction of the primary winding (5), the hold-down edges (74) being adapted to bear against the respective ends of the primary winding (5) in the up-down direction, the hold-down edges (74) of the two insulating hold-down members together clamping the primary winding (5) in the up-down direction.

5. An electric furnace transformer according to claim 4, characterized in that the insulating hold-down member has a horizontal gap with the core (1) for air to flow through for heat dissipation.

6. An electric furnace transformer according to any one of claims 1-5, characterized in that the primary winding (5) has two terminals on which a low voltage conductor bar (8) is fixed; the upper clamping piece (2) and the lower clamping piece (3) are respectively provided with a low-voltage outlet fixing clamp (9), and the low-voltage outlet fixing clamps (9) of the upper clamping piece (2) and the lower clamping piece (3) clamp the low-voltage conductive bars (8) up and down together.

7. The electric furnace transformer according to claim 6, characterized in that a limit groove (91) is provided in the low-voltage outlet fixing clip (9) on the side facing the low-voltage conductor bar (8), and the low-voltage conductor bar (8) extends into the limit groove (91) of the corresponding side low-voltage outlet fixing clip (9).

8. An electric furnace transformer according to any one of claims 1-5, characterized in that the secondary windings (6) are stacked up and down with at least two, any adjacent two secondary windings (6) sharing one insulating pressing member, the upper and lower sides of the insulating pressing member between the two secondary windings (6) being provided with the clamping grooves (71).

9. The electric furnace transformer of any one of claims 1-5, wherein the insulating compression member is an epoxy insulating compression member.

10. An electric furnace transformer according to any one of claims 1-5, characterized in that the core (1) is an amorphous alloy core.