CN213844988U

CN213844988U - Transformer coil pressing structure

Info

Publication number: CN213844988U
Application number: CN202120044705.9U
Authority: CN
Inventors: 叶艳燕
Original assignee: Yunnan Transformer Electric Co ltd
Current assignee: Yunnan Transformer Electric Co ltd
Priority date: 2021-01-08
Filing date: 2021-01-08
Publication date: 2021-07-30
Anticipated expiration: 2031-01-08

Abstract

The application discloses transformer coil compact structure includes: the clamp assemblies are symmetrically arranged on two end faces of the iron core, the outer wall of the iron core is sleeved with at least one group of coils; the clamp assembly includes: the device comprises a first clamping plate, a second clamping plate, a plurality of cushion blocks and a main pressing plate; the main pressure plate is pressed on the end face of the coil; the cushion blocks are symmetrically arranged on two opposite side edges of the main pressure plate in pairs; the bottom surfaces of the first clamping plates are arranged on the cushion blocks arranged on one side of the main pressing plate in pairs; the bottom surfaces of the second clamping plates are arranged on the cushion blocks arranged on the other side of the main pressing plate in pairs. This simple structure only needs set up splint in pairs on the iron core terminal surface of coil is established to the cover to through jack top folder and coil, later put into the cushion again and compress tightly the coil. Therefore, the components such as the pressing nail, the pressing nail gasket, the hexagon nut and the like are omitted, and the effect of reducing the cost is achieved.

Description

Transformer coil pressing structure

Technical Field

The application relates to a transformer coil compact structure belongs to transformer technical field.

Background

The transformer is an electrical device for converting alternating voltage, is mainly used for common-frequency transformation of alternating current, can boost or reduce voltage, and is an indispensable important electrical device for a power system and a power supply system. Transformers can change voltage, current, trans-impedance, change phase, etc.

In the running transformer, leakage magnetic flux exists between the two coils, axial and transverse electrodynamic forces are generated on the coils by the leakage magnetic flux, particularly when the transformer is in short circuit, the short circuit current can possibly reach about 10-13 times of the rated current, and the electrodynamic force is increased according to the square time relation of the current, so that the axial compression structure tightness of the transformer coils is related to the safety of the transformer in the running process.

The conventional axial compression structure for the coil of the transformer above the medium-sized transformer is clamped and arranged on the transversely extending end of the nail pressing seat 21 'through the clamping piece 10', and is screwed and arranged on the nail pressing seat 21 'after the nail pressing 22', so that the first coil 31 'and the second coil 32' are axially compressed, and the specific structure is shown in fig. 1. As can be seen from fig. 1, after the pressing nail 22 'is screwed, the pressing nail 22' vertically pushes the pressing nail washer 24 ', the pressing nail cushion block 25', the main pressing plate 26 ', and a hexagonal thin nut 23' is arranged between the pressing nail 22 'and the pressing nail washer 24' to press the first coil 31 'and the second coil 32' sleeved on the iron core.

The axial compression structure needs to realize vertical transfer of compression force through the clamp, has low reliability of axial compression force, applies lower compression force, and cannot meet the axial compression reliability under long-term outdoor use conditions.

Meanwhile, with the constant pressure process of the coil and the use of a small jack, the importance of the pressing nail structure is gradually reduced. The structure of the existing compressing clamp needs to be improved so that the compressing clamp is suitable for the constant-pressure compressing process.

SUMMERY OF THE UTILITY MODEL

The application provides a transformer coil compact structure for solving above-mentioned technical problem.

The application provides a transformer coil compact structure includes: the clamp assemblies are symmetrically arranged on two end faces of the iron core, the outer wall of the iron core is sleeved with at least one group of coils;

the clamp assembly includes: the device comprises a first clamping plate, a second clamping plate, a plurality of cushion blocks and a main pressing plate; the main pressure plate is pressed on the end face of the coil; the cushion blocks are symmetrically arranged on two opposite side edges of the main pressure plate in pairs;

the bottom surfaces of the first clamping plates are arranged on the cushion blocks arranged on one side of the main pressing plate in pairs;

the bottom surfaces of the second clamping plates are arranged on the cushion blocks arranged on the other side of the main pressing plate in pairs.

Preferably, the spacer block comprises: the first cushion block and the second cushion block are symmetrically arranged on two sides of a first symmetric shaft of the main pressure plate, and the first clamp plate is arranged on the top surfaces of the first cushion block and the second cushion block along a connecting line of the first cushion block and the second cushion block;

the third cushion block and the fourth cushion block are symmetrically arranged on two sides of a second symmetric axis of the main pressure plate, and the second clamping plate is arranged on the top surfaces of the third cushion block and the fourth cushion block along a connecting line of the third cushion block and the fourth cushion block;

the first symmetry axis and the second symmetry axis are perpendicularly intersected at the circle center of the main pressure plate.

Preferably, the first clamping plate and the second clamping plate are arranged in parallel.

Preferably, the method comprises the following steps: and the first clamping plate and the second clamping plate are connected with the cushion block through the bases.

Preferably, the base includes: the first base is arranged on the top surface of the first cushion block; the second base is arranged on the top surface of the second cushion block; the third base is arranged on the top surface of the third cushion block; the fourth base is arranged on the top surface of the fourth cushion block.

Preferably, the method comprises the following steps: and the nylon bolts are arranged on the base and extend into the cushion blocks to be arranged. And the nylon bolts are connected with the cushion blocks.

Preferably, the method comprises the following steps: the first coil is sleeved on the outer wall of the iron core;

the second coil is sleeved on the outer wall of the first coil.

The beneficial effects that this application can produce include:

1) the application provides a transformer coil compact structure, this simple structure only needs set up splint in pairs on the iron core terminal surface of coil is established to the cover to through jack top clamp and coil, later put into the cushion again and compress tightly the coil. Therefore, the components such as the pressing nail, the pressing nail gasket, the hexagon nut and the like are omitted, and the effect of reducing the cost is achieved.

2) The application provides a transformer coil compact structure, through to simplifying current compact structure, compress tightly the clamp plate through the anchor clamps along with in pairs simultaneously extrudeing, realize the effective extrusion to main clamp plate structure to the realization compresses tightly the effect to transformer coil axial, simple structure, and the equipment is convenient, compresses tightly effectually, guarantees when reducing used part to step up the effect.

Drawings

FIG. 1 is a schematic diagram of an axial compression structure of a transformer coil in the prior art;

fig. 2 is a schematic front view of a transformer coil compression structure provided in the present application;

FIG. 3 is a schematic top view of the structure of the cushion block and the main platen in the structure provided by the present application;

FIG. 4 is a schematic perspective top view of the structure of the fixture and coil mounting location with the main platen removed in the configuration provided herein;

illustration of the drawings:

11. a first coil; 12. a second coil; 13. an iron core; 201. a first splint; 202. a second splint; 23. a nylon bolt; 24. cushion blocks; 241. a first cushion block; 242. a second cushion block; 243. a third cushion block; 244. a fourth cushion block; 25. a main pressure plate; 22. a base; 221. a first base; 222. a second base; 223. a third base; 224. and a fourth base.

Detailed Description

The present application will be described in detail with reference to examples, but the present application is not limited to these examples.

Referring to fig. 2-4, the application provides a transformer coil compact structure, includes: the clamp assemblies are symmetrically arranged on two end faces of the iron core 13, the outer wall of which is sleeved with at least one group of coils; the clamp assembly includes: a first clamping plate 201, a second clamping plate 202, a plurality of spacers 24 and a main pressure plate 25; the main pressure plate 25 is pressed on the end face of the coil; the cushion blocks 24 are symmetrically arranged on two opposite side edges of the main pressure plate 25 in pairs; the bottom surfaces of the first clamping plates 201 are arranged on the cushion blocks 24 which are arranged on one side of the main pressing plate 25 in pairs; the bottom surfaces of the second clamping plates 202 are mounted on the spacers 24 arranged in pairs on the other side of the main pressing plate 25.

The clamping plates in the clamp assembly are all perpendicular to the main pressing plate 25, so that the turning in the pressing force transmission process can be reduced, the acting reliability of the pressing force is improved, meanwhile, the clamp is simple in structure, the nail pressing seat and auxiliary components thereof are not needed, the cost is reduced, and the installation reliability is guaranteed.

During the use, set up anchor clamps through the iron core 13 both ends of overlapping the coil respectively after, wear to locate on the splint extension end in the anchor clamps subassembly of both ends through taut screw rod to be connected with taut board, realize exerting axial packing force to anchor clamps through taut board. The tension plate and the screw rod are of the conventional structure, and the description is omitted.

Preferably, the cushion block 24 includes a first cushion block 241, a second cushion block 242, a third cushion block 243 and a fourth cushion block 244 which are arranged on the top surface of the main pressure plate 25, the first cushion block 241 and the second cushion block 242 are symmetrically arranged on two sides of a first symmetric axis of the main pressure plate 25, and the first clamping plate 201 is arranged on the top surface of the first cushion block 241 and the second cushion block 242 along a connecting line of the first cushion block 241 and the second cushion block 242; the third cushion block 243 and the fourth cushion block 244 are symmetrically arranged at two sides of a second symmetric axis of the main press plate 25, and the second clamp plate 202 is arranged on the top surfaces of the third cushion block 243 and the fourth cushion block 244 along the connecting line of the third cushion block 243 and the fourth cushion block 244;

the first symmetry axis and the second symmetry axis are perpendicularly intersected at the circle center of the main pressure plate 25.

According to the arrangement, the first cushion block 241, the second cushion block 242, the third cushion block 243 and the fourth cushion block 244 which are symmetrically arranged in pairs can respectively provide powerful parallel support for the first clamping plate 201 and the second clamping plate 202, so that the clamping apparatus can apply balanced pressing force to the coil, and the problem that the coil deforms in use due to excessive local pressure is avoided.

Preferably, the first clamping plate 201 and the second clamping plate 202 are arranged in parallel.

Preferably, the method comprises the following steps: the base 22, the first clamping plate 201 and the second clamping plate 202 are connected with the cushion block 24 through the base 22. Specifically, the top surface of the base 22 is connected to the bottom surface of the first clamping plate 201; the bottom surface of the base 22 is connected with the top surface of the cushion block 24; the top surface of the base 22 is connected with the bottom surface of the second clamping plate 202; the bottom surface of base 22 is connected to the top surface of spacer 24.

Through setting up first splint 201 and the second splint 202 of support that base 22 can be better, improve and apply the back anchor clamps installation reliability of clamping force, improve the transformer axial in the use and apply the reliability with clamping force.

Preferably, the base 22 comprises: a first base 221, a second base 222, a third base 223, and a fourth base 224, wherein the first base 221 is disposed on the top surface of the first pad 241; the second base 222 is disposed on the top surface of the second pad 242; the third base 223 is disposed on the top surface of the third pad 243; the fourth pedestal 224 is disposed on a top surface of the fourth block 244.

This arrangement provides a flat mounting surface for the clamping plate via the spacers 24 and the base 22, and reliably applies the pressing force.

Preferably, the method comprises the following steps: and the nylon bolts 23 are arranged in pairs, and the nylon bolts 23 are arranged on the base 22 and extend into the cushion blocks 24. Connected with a cushion block 24 through a nylon bolt 23. The base 22 is connected to the spacer 24 by nylon bolts 23. Nylon bolts 23 are respectively arranged at each vertex angle on the top surface of the base 22 to realize the connection of the base 22 and the cushion block 24; or the nylon bolts 23 are symmetrically arranged on two sides of the clamping plate in pairs to realize the connection of the base 22 and the cushion block 24. To prevent movement of the spacers 24, each spacer 24 is positioned with two nylon bolts 23.

Referring to fig. 4, preferably, it includes: the coil comprises a first coil 11 and a second coil 12, wherein the first coil 11 is sleeved on the outer wall of an iron core 13; the outer wall of the first coil 11 is sleeved with a second coil 12.

The first coil 11 and the second coil 12 are firstly pre-pressed to a predetermined height on a press with a constant pressure device, and then sleeved on an iron core column, and then main pressing plates 25 are sleeved on two ends of an iron core 13 column of the assembled coil. Between the clamping plates and the main pressure plate 25, 4 hydraulic jacks are arranged, adding to the required pressure. A pad 24 of electrical laminated wood is placed between the clamping plate and the main press plate 25 and is repeatedly applied several times to achieve the desired axial pressure. The jack is removed, and the elasticity of the coil can be utilized to ensure that the coil has relatively stable axial pressing force in the long-term operation of the transformer.

In order to prevent the cushion blocks 24 from moving, two nylon bolts 23 are arranged on each cushion block 24 for positioning. The base 22 is a steel plate with the thickness of 20mm, the base 22 is welded on the bottom surface of the clamping plate, and the clamping plate body has the function of a reinforcing plate. The base 22 is provided with a threaded hole matched with the cushion block 24 for screwing the nylon bolt 23, and the cushion block 24 is provided with a round hole with a certain depth and can be penetrated into the nylon bolt 23. In this way, the compression of the coil is achieved by the cooperation of the various aspects.

Reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," "a preferred embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally in this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the disclosure to effect such feature, structure, or characteristic in connection with other embodiments.

Although the present application has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims

1. A transformer coil compression structure, comprising: the clamp assemblies are symmetrically arranged on two end faces of an iron core (13) of which the outer wall is sleeved with at least one group of coils;

the clamp assembly includes: a first clamping plate (201), a second clamping plate (202), a plurality of cushion blocks (24) and a main pressure plate (25); the main pressure plate (25) is pressed on the end face of the coil; the cushion blocks (24) are symmetrically arranged on two opposite side edges of the main pressure plate (25) in pairs;

the bottom surfaces of the first clamping plates (201) are arranged on the cushion blocks (24) which are arranged on one side of the main pressing plate (25) in pairs;

the bottom surfaces of the second clamping plates (202) are arranged on the cushion blocks (24) which are arranged on the other side of the main pressing plate (25) in pairs.

2. The transformer coil compression structure according to claim 1, wherein the spacer (24) comprises: the first cushion block (241), the second cushion block (242), the third cushion block (243) and the fourth cushion block (244) are arranged on the top surface of the main pressure plate (25), the first cushion block (241) and the second cushion block (242) are symmetrically arranged on two sides of a first symmetric axis of the main pressure plate (25), and the first clamp plate (201) is arranged on the top surfaces of the first cushion block (241) and the second cushion block (242) along a connecting line of the first cushion block (241) and the second cushion block (242);

the third cushion block (243) and the fourth cushion block (244) are symmetrically arranged on two sides of a second symmetric axis of the main pressure plate (25), and the second clamping plate (202) is arranged on the top surfaces of the third cushion block (243) and the fourth cushion block (244) along the connecting line of the third cushion block (243) and the fourth cushion block (244);

the first symmetry axis and the second symmetry axis are perpendicularly intersected at the circle center of the main pressure plate (25).

3. The transformer coil pressing structure according to claim 2, wherein the first and second clamping plates (201, 202) are arranged in parallel with each other.

4. The transformer coil compression structure of claim 1, comprising: and the first clamping plate (201) and the second clamping plate (202) are connected with the cushion block (24) through the bases (22).

5. The transformer coil compression structure according to claim 4, wherein the base (22) comprises: the first base (221), the second base (222), the third base (223) and the fourth base (224), wherein the first base (221) is arranged on the top surface of the first cushion block (241); the second base (222) is arranged on the top surface of the second cushion block (242); the third base (223) is arranged on the top surface of the third cushion block (243); the fourth base (224) is disposed on a top surface of the fourth head block (244).

6. The transformer coil compression structure of claim 4, comprising: the nylon bolts (23) are arranged in pairs, and the nylon bolts (23) are arranged on the base (22) and extend into the cushion blocks (24); is connected with the cushion block (24) through a nylon bolt (23).

7. The transformer coil compression structure of claim 1, comprising: the coil comprises a first coil (11) and a second coil (12), wherein the first coil (11) is sleeved on the outer wall of the iron core (13);

the outer wall of the first coil (11) is sleeved with a second coil (12).