CN115132461A

CN115132461A - Coil and assembling method

Info

Publication number: CN115132461A
Application number: CN202210910600.6A
Authority: CN
Inventors: 聂贵锋; 李梦军; 陈佳枚; 刘梓洋
Original assignee: Guangzhou CRRC Junfa Electrical Co Ltd
Current assignee: Guangzhou CRRC Junfa Electrical Co Ltd
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2022-09-30

Abstract

The invention discloses a coil and an assembly method, and the coil comprises a coil body, an upper end hoop, a lower end hoop and an inner supporting plate, wherein the upper end hoop and the lower end hoop form a first axial tensioning structure, and the inner supporting plate is used for tensioning the inner periphery of the coil body and forming a heat dissipation channel. An assembly method for said coil comprising the steps of: the coil body is wound; the inner supporting plate is arranged in the middle of the inner periphery of the coil body; the upper end hoop and the lower end hoop are respectively fixed at the upper end and the lower end of the coil body; and the upper end hoop and the lower end hoop are respectively provided with a second radial tensioning structure for tensioning the long edge of the coil body. Based on this, both provided axial tension, provided radial tension again, the backup pad in the cooperation to comprehensively support the coil body, effectively solved noise and temperature rise problem.

Description

Coil and assembling method

Technical Field

The invention belongs to the technical field of distribution transformer coils, and particularly relates to a coil and an assembly method.

Background

Among the prior art, distribution transformer's coil adopts the end to seal the structure in order to guarantee its structural stability, and the end that has now seals the structure and uses epoxy resin casting moulding, nevertheless has following characteristics in the in-service use: the two ends are sealed, the middle is hollow, the middle structure of the coil is loose, noise is easy to generate in the using process, and the temperature rise phenomenon is easy to occur.

In view of the above, in the prior art, the above problem is solved by providing the stay, and in order to ensure the stability of the stay, two ends of the stay respectively abut against the inner periphery of the coil and the iron core located in the coil, but the use of the stay has the following problems: firstly, the heat dissipation gap between the coil and the iron core is occupied by the stay, the heat dissipation effect is worsened, and the more the stays are, the worse the heat dissipation is; and secondly, the stay enables the coil to be connected with the iron core, and the stay transfers heat between the stay and the iron core to enable the temperature rise of the coil to be consistent with that of the iron core, so that the service lives of the stay and the iron core are shortened.

Disclosure of Invention

It is an object of the present invention to provide a coil and method of assembly that solves the above-mentioned problems of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the invention provides a coil, which comprises a coil body, an upper end hoop and a lower end hoop which are respectively positioned at the upper end and the lower end of the coil body, and an inner supporting plate positioned in the middle of the inner periphery of the coil body, wherein the coil body is sleeved on an iron core, the upper end hoop and the lower end hoop are both constructed into annular structures and form a first axial tensioning structure, the first axial tensioning structure is used for insulating encapsulation and axial compression of two ends of the coil body, the inner supporting plate is assembled in the middle of the inner periphery of the coil body and forms a first radial tensioning structure with the coil body, and a gap is reserved between the inner supporting plate and the iron core to form a heat dissipation channel.

The first axial tensioning structure and the two ends of the coil body form an insulation packaging structure to ensure that a safe insulation distance is formed between the two ends of the coil body and the iron core, and the first axial tensioning structure and the coil body and the iron core form a first axial tensioning structure to ensure that the relative position between the coil body and the iron core is unchanged during the operation of the transformer.

In one possible embodiment, the inner circumference of the upper end bell and the inner circumference of the lower end bell are each provided with a second radial tensioning for radially pressing the coil body.

In a possible design, the upper end hoop and the lower end hoop are both constructed as annular plates matched with the coil body, a plurality of supporting plates capable of reciprocating along the radial direction of the annular plates are uniformly arranged on the annular plates, and all the supporting plates form the second radial tensioning structure.

In one possible design, the supporting plate comprises an adjusting rod, a supporting plate body and a nut, wherein the adjusting rod penetrates through the annular plate and can slide in a reciprocating manner along the radial direction of the annular plate;

the control end of the adjusting rod is moved along the radial direction of the annular plate so as to drive the supporting plate body to move along the radial direction of the coil body, and the inner periphery of the coil body is pressed or loosened.

In one possible design, the supporting plate body comprises a base plate, a resisting plate and a sliding support, the base plate is connected with the connecting end of the adjusting rod, the resisting plate is connected with the base plate through the sliding support, one end of the sliding support is arranged on the base plate in a sliding mode through a roller, and the other end of the sliding support is connected with the resisting plate through a hinge; correspondingly, a sliding groove which is matched with the roller is arranged on the base plate;

when the substrate moves along the radial direction of the coil body, the roller substrate slides up and down in the sliding groove so as to adjust the radial distance between the abutting plate and the inner periphery of the coil body.

In one possible design, a plurality of heat dissipation grooves are formed in the annular plate, correspondingly, a plurality of ventilation holes are formed in the coil body, and the heat dissipation grooves are in one-to-one correspondence with the ventilation holes and are communicated with the ventilation holes.

In one possible design, the upper end hoop is provided with a connecting groove for connecting the copper bar, a clamping plate is arranged in the connecting groove, and the clamping plate divides the connecting groove into two sub-groove bodies;

two first screw holes are arranged in the radial direction of the upper end hoop, two second screw holes are arranged on the clamping plate, the first screw holes and the second screw holes are arranged in a one-to-one correspondence mode, and the corresponding first screw holes are communicated with the second screw holes to form adjusting holes for adjusting the position of the clamping plate; correspondingly, the adjusting hole is provided with a bolt for connecting the upper end hoop and the clamping plate in a penetrating way.

In one possible design, a plurality of supporting columns are uniformly arranged on the top surface of the upper end hoop and the bottom surface of the lower end hoop respectively, the supporting columns are in a cone frustum shape, and the supporting columns are integrally formed with the upper end hoop or the lower end hoop respectively;

when the coil is used for assembling the transformer, the supporting columns are connected with the upper clamping piece and the lower clamping piece of the iron core to form a second axial tensioning structure.

In one possible design, the inner supporting plate comprises two oppositely arranged sub-plates and a double-end screw for connecting the two sub-plates, the sub-plates are constructed into arc-shaped plates matched with the coil body, and two ends of each sub-plate are respectively connected with the double-end screw;

the double-thread screw is provided with reverse threads with opposite rotation directions, and the double-thread screw is rotated to enable the sub-plate to reciprocate along the circumferential direction of the coil body, so that the sub-plate is pressed or loosened on the inner circumference of the coil body.

In a second aspect, the present invention provides an assembly method for said coil, comprising the steps of:

winding a coil body;

installing an inner supporting plate, an upper end hoop and a lower end hoop to replace an end sealing structure molded by casting at two ends of the coil body;

wherein, the upper end hoop and the lower end hoop are installed after the inner supporting plate is installed;

the inner supporting plate is arranged in the middle of the inner periphery of the coil body so as to press each layer of foil material in the middle of the coil body;

the upper end hoop is arranged at the upper end of the coil body, and the lower end hoop is arranged at the lower end of the coil body so as to axially compress the coil body;

the upper end hoop and the lower end hoop are respectively provided with a second radial tensioning structure, each layer of foil at the two ends of the coil body is compressed through the second radial tensioning structures, and the inner supporting plate, the upper end hoop, the lower end hoop and the second radial tensioning structures are matched to compress the coil body into a rigid connector.

Has the advantages that:

the formed upper end hoop and the lower end hoop replace the existing pouring end seal structure, and the process difficulty and the manufacturing period of the coil body end seal are effectively simplified.

The upper end hoop and the lower end hoop form a first axial tensioning structure and apply axial tensioning force to the coil body, the first axial tensioning structure is matched with the second radial tensioning structure, single axial force borne during assembly of the coil body is decomposed into axial pressure along the axial direction of the coil body and axial friction force generated by the radial pressure, the problem that the coil body deforms or cracks due to overlarge single axial force is solved, rigid connection is formed at two ends of the coil body, and the problems of noise and heat dissipation in the operation process of a transformer are solved.

The inner supporting plate is used for radially tensioning the middle of the coil body, so that closed air does not exist between all layers of foils in the middle of the coil body, and meanwhile, the middle of the coil body is rigidly connected due to the radial tensioning force, so that the problems of temperature rise and standard exceeding of noise which are not solved for many years in the industry are fundamentally solved.

The support columns on the upper end hoop and the lower end hoop replace the existing cushion block structure, the structure and the assembly parts of the transformer are simplified, the assembly workload is reduced, the structural stability is improved, the ventilation area of the end part of the coil is increased, and the heat dissipation capacity is improved.

Drawings

Fig. 1 is a schematic diagram of a coil structure.

Fig. 2 is a partially enlarged structural view of an upper portion of a coil.

Fig. 3 is a schematic structural view of the upper end band.

Fig. 4 is a schematic structural view of the lower end band.

Fig. 5 is a schematic structural diagram of a strut.

Fig. 6 is a schematic cross-sectional structure view of the connection between the upper end hoop and the copper bar.

Fig. 7 is a structural diagram of the inner supporting plate.

In the figure:

1. a coil body; 2. an upper end hoop; 201. connecting grooves; 202. a splint; 203. a first screw hole; 204. a second screw hole; 3. a lower end hoop; 4. an inner supporting plate; 41. a daughter board; 42. a stud bolt; 5. a supporting plate; 51. adjusting a rod; 52. a supporting plate body; 521. a substrate; 522. a resisting plate; 523. a sliding support; 53. a nut; 61. a heat sink; 62. a support pillar; 7. and (6) copper bars.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly described below with reference to the accompanying drawings and the embodiments or the description in the prior art, it is obvious that the following description of the structure of the drawings is only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto.

The embodiment is as follows:

as shown in fig. 1-7, the present embodiment provides a coil, including a coil body 1, an upper end hoop 2 and a lower end hoop 3 respectively located at the upper end and the lower end of the coil body 1, and an inner supporting plate 4 located at the middle of the inner periphery of the coil body 1, wherein the coil body 1 is sleeved on an iron core, both the upper end hoop 2 and the lower end hoop 3 are configured as an annular structure and form a first axial tensioning structure, the first axial tensioning structure is used for insulating encapsulation and axial compression at both ends of the coil body 1, the inner supporting plate 4 is assembled at the middle of the inner periphery of the coil body 1 and forms a first radial tensioning structure with the coil body 1, and a gap is left between the inner supporting plate 4 and the iron core to form a heat dissipation channel.

The first axial tensioning structure and the two ends of the coil body 1 form an insulation packaging structure to ensure that a safe insulation distance is formed between the two ends of the coil body 1 and the iron core, and the first axial tensioning structure and the coil body 1 and the iron core form a first axial tensioning structure to ensure that the relative position between the coil body 1 and the iron core is unchanged during the operation of the transformer.

Aiming at the problems existing in the prior art, the coil forms a first axial tensioning structure through an upper end hoop 2 and a lower end hoop 3 and applies axial tensioning force to a coil body 1, the first axial tensioning structure is matched with a second radial tensioning structure, single axial force borne during assembly of the coil body 1 is decomposed into axial pressure along the coil body 1 and axial friction force generated by the radial pressure, the problem that the coil body 1 deforms or cracks due to overlarge single axial force is solved, two ends of the coil body 1 are rigidly connected, and the problems of noise and heat dissipation in the running process of a transformer are solved.

The upper end hoop 2 and the lower end hoop 3 are matched to tension two ends of the coil body 1, and the inner supporting plate 4 is used for tensioning the middle of the coil body 1, so that all layers of the coil body 1 are compacted to form a rigid whole, vibration generated when the low-voltage coil body 1 operates is reduced, and all layers of the coil body 1 are in close contact to accelerate heat transfer. And on the basis of guaranteeing the tensioning effect, the inner supporting plate 4 forms a heat dissipation channel, so that the heat dissipation effect is further guaranteed. Based on this, both solved the problem of coil body 1 noise in the operation, compressed tightly coil body 1 again and solved the problem of temperature propagation.

As shown in fig. 1, the coil body 1 is in a shape of a kidney-shaped circle, the coil body 1 is a closed structure composed of two semicircular sides and two long sides, and after actual winding, the long sides of the coil body 1 look tensioned, but actually are in a loose state. It is inferred that when the coil body 1 is in the long circle shape, the long edge of the coil body 1 is in a loose state after the coil body is wound, and noise is easy to generate in the using process.

The combination of the first axial tensioning structure and the inner support plate 4 effectively solves the problem that the coil body 1 is loose in structure in the axial direction, avoids noise generation, and has poor long edge tensioning effect on the coil body 1. Therefore, it is preferable that the inner circumferences of the upper and

lower yokes

2 and 3 are respectively provided with a second radial tension structure for tensioning the long sides of the coil body 1.

Based on the above design scheme, on one hand, the second radial tensioning structure is used for applying radial acting force to the inner peripheries of the two ends of the coil body 1 and compacting layers of the two ends of the coil body 1 to form a rigid whole body so as to enhance the radial whole structure strength of the non-circular coil, when the upper end hoop 2 and the lower end hoop 3 are in contact with the two end surfaces of the coil body 1 to generate axial pressure, the rigid connection fundamentally avoids the risk of axial deformation or fracturing of the foils of the layers of the two ends of the coil body 1, and on the other hand, the second radial tensioning structure and the inner peripheries of the coil body 1 generate axial friction force due to the radial acting force so as to share the axial pressure of the load bearing of the two ends of the coil body.

In this embodiment, the upper end hoop 2 and the lower end hoop 3 are both configured as a ring plate adapted to the coil body 1, a plurality of supporting plates 5 capable of reciprocating in the radial direction of the ring plate are uniformly arranged on the ring plate, and all the supporting plates 5 form the second radial tensioning structure. Based on above-mentioned design, annular plate adaptation coil body 1 is in order to guarantee to press the performance, ensures that axial tension is done on coil body 1. And the annular plate is provided with a plurality of mounting holes which are matched with the supporting plates 5, and the mounting holes are arranged in one-to-one correspondence with the supporting plates 5.

The supporting plate 5 has sliding performance to be adapted to the coil bodies 1 with different inner diameters, so that the application range and the practicability are improved. And the fagging 5 are independent each other, and every fagging 5 all can be adjusted alone, then in the in-service use process, can require the position at every fagging 5 place of independent regulation according to the tensioning to reach best tensioning effect.

It will be readily appreciated that the annular plate is adapted to the coil body 1, which then also comprises two arc-shaped sides and two long sides. Then, preferably, as shown in fig. 3 and 4, a plurality of supporting plates 5 are uniformly distributed on two arc-shaped edges of the annular plate, based on which the supporting plates 5 tension the arc-shaped edges of the coil body 1, and further stretch the long edges of the coil body 1, so as to tension the whole coil body 1, the stability of the coil body 1 is better in the using process, and the noise and the temperature rise are improved. Optionally, at least two gussets 5 are provided on each arcuate edge of the ring plate, including but not limited to the three gussets 5 shown in fig. 4.

The structure of the bracing plate 5 includes but is not limited to: the supporting plate 5 comprises an adjusting rod 51, a supporting plate body 52 and a nut 53, wherein the adjusting rod 51 is arranged on the annular plate in a penetrating mode and can slide in a reciprocating mode in the radial direction of the annular plate, one end of the adjusting rod 51 extends into the annular plate and is connected with the supporting plate body 52 to form a connecting end, the other end of the adjusting rod 51 extends out of the annular plate and is connected with the nut 53 to form a control end, and the nut 53 is used for driving the adjusting rod 51 to slide in a reciprocating mode in the radial direction of the annular plate; the control end of the adjusting rod 51 is moved in the radial direction of the annular plate to drive the supporting plate body 52 to move in the radial direction of the coil body 1 to press or release the inner periphery of the coil body 1.

Based on this, the adjusting rod 51 passes through the control end which is extended outward so that the worker can use the adjusting rod, the worker makes the adjusting rod 51 slide along the mounting hole in a reciprocating manner, the bracing plate body 52 connected with the adjusting rod 51 also slides, and the distance between the bracing plate body 52 and the coil body 1 is changed. When the supporting plate body 52 abuts against the coil body 1, the supporting plate body 52 applies a radial tension to the coil body 1, so as to tension the coil body 1.

Further, fagging body 52 is located the annular plate inboard, and then the radial tensile force that fagging body 52 applyed is outside thrust, and inward thrust not only can tension coil body 1 by outside thrust, also avoids coil body 1 to warp, guarantees coil body 1 normal use.

Meanwhile, as shown in fig. 5, the control end of the adjusting rod 51 is provided with a thread extending towards the connecting end, and when the adjusting rod 51 is inserted on the annular plate, the control end is sleeved with a nut 53. Based on this, through twisting nut 53 in order to control the reciprocal slip of adjusting pole 51, nut 53 and the combination of adjusting pole 51 not only simple structure, convenient operation still economic saving, reduce cost.

Preferably, the bracing plate body 52 comprises a base plate 521, a resisting plate 522 and a sliding support 523, the base plate 521 is connected with the connecting end of the adjusting rod 51, the resisting plate 522 is connected with the base plate 521 through the sliding support 523, one end of the sliding support 523 is slidably arranged on the base plate 521 through a roller, and the other end of the sliding support 523 is connected with the resisting plate 522 through a hinge; correspondingly, a sliding groove adapted to the roller is arranged on the substrate 521; when the substrate 521 moves along the coil body 1 in the radial direction, the roller slides up and down on the substrate 521 to adjust the radial distance between the abutting plate 522 and the inner periphery of the coil body 1.

Based on this, when the fagging body 52 butt joint coil body 1, sliding support 523 is being compressed and is out of shape to make to support board 522 and evenly press on coil body 1, radial tensile force homogeneous action avoids appearing local stress concentration phenomenon.

Optionally, the sliding bracket 523 includes two supporting rods, the middle portions of the two supporting rods are hinged to each other and are in an X shape, one end of each supporting rod is connected to the abutting plate 522, and the other end of each supporting rod is slidably disposed on the substrate 521 through a roller.

In a possible implementation manner, a plurality of heat dissipation grooves 61 are formed in the annular plate, correspondingly, a plurality of ventilation holes are formed in the coil body 1, and the heat dissipation grooves 61 are in one-to-one correspondence with the ventilation holes and are communicated with the ventilation holes. Based on above-mentioned technical scheme, the heat dissipation channel is constituteed with the ventilation hole on the coil body 1 to radiating groove 61, increases the air flow property, improves the heat-sinking capability, reduces the temperature rise range of coil body 1 in the use.

It is easily understood that the arrangement position and the shape of the heat dissipation groove 61 are designed according to the structure of the coil body 1, and alternatively, as shown in fig. 3 and 4, the heat dissipation groove 61 includes a rectangular groove at the long side of the annular plate and an arc-shaped groove at the arc-shaped side of the annular plate.

The upper end hoop 2 and the lower end hoop 3 have the same function, so in order to save cost, the upper end hoop 2 and the lower end hoop are basically the same in structure, but the upper end hoop 2 is also provided with a copper bar 7 to be communicated with a power supply bus. Therefore, the structure of the upper end hoop 2 is improved: the upper end hoop 2 is provided with a connecting groove 201 for connecting the copper bar 7, a clamping plate 202 is arranged in the connecting groove 201, and the clamping plate 202 separates the connecting groove 201 into two sub-groove bodies.

Based on above-mentioned technical scheme, connect copper bar 7 through spread groove 201 to fix copper bar 7 through splint 202, appear rocking in order to avoid copper bar 7 in the course of the work. Meanwhile, the connecting groove 201 is divided into two sub-groove bodies by the clamping plate 202, each sub-groove body can be connected with one copper bar 7, and the connection of the copper bars 7 is realized. In addition, through the arrangement of the connecting groove 201 and the clamping plate 202, the upper end hoop 2 is different from the lower end hoop 3 in structure, which is beneficial to distinguishing and reduces the probability of misuse.

Preferably, as shown in fig. 6, two first screw holes 203 are radially provided on the upper end hoop 2, two second screw holes 204 are provided on the clamping plate 202, the first screw holes 203 and the second screw holes 204 are provided in a one-to-one correspondence, and the corresponding first screw holes 203 and the second screw holes 204 are communicated and form an adjusting hole for adjusting the position of the clamping plate 202; correspondingly, the adjusting hole is provided with a bolt for connecting the upper end hoop 2 and the clamping plate 202.

Based on this, peg graft the threaded rod to the regulation downthehole in order to adjust splint 202 position to adjust the volume of two sub-tank bodies, the sub-tank body adapts to the link of copper bar 7 and fixes copper bar 7. Alternatively, the adjusting holes may be disposed on the same side or on both sides of the clamping plate 202.

In a possible implementation manner, a plurality of supporting columns 62 are uniformly arranged on the top surface of the upper end hoop 2 and the bottom surface of the lower end hoop 3 respectively, and the supporting columns 62 are in a truncated cone shape. Based on the technical scheme, the support columns 62 on the upper end hoop 2 and the lower end hoop 3 replace the existing cushion block structure, the structure and the assembly parts of the transformer are simplified, the assembly workload is reduced, the structural stability is improved, the ventilation area of the coil end is increased, and the heat dissipation capacity is improved. Alternatively, the support column 62 may also be configured in the shape of a truncated pyramid.

Preferably, the support posts 62 are integrally formed with the upper or

lower ferrules

2 and 3, respectively. Therefore, the number of system parts is reduced, and the structural stability is improved.

And when the coil is used for transformer assembly, the supporting column 62 is connected with the upper and lower clamping pieces of the iron core to form a second axial tensioning structure. Based on this, make adjacent coil axial compress tightly, and do not disturb the heat dissipation. It is understood that the upper and lower clip members are prior art and will not be described herein.

In this embodiment, the inner supporting plate 4 includes two sub-plates 41 disposed oppositely and a double-threaded screw for connecting the two sub-plates 41, the sub-plates 41 are configured to be adapted to the arc-shaped plate of the coil body 1, and two ends of the sub-plates 41 are respectively connected with the double-threaded screw; the double-threaded screw is provided with reverse threads with opposite rotation directions, and the double-threaded screw is rotated to make the sub-plate 41 reciprocate along the circumferential direction of the coil body 1, so that the sub-plate 41 is pressed or loosened on the inner circumference of the coil body 1.

Based on above-mentioned technical scheme, to the coil body 1 of different length, interior vaulting pole 4 is through twisting the interval of moving two daughter boards 41 of double threaded screw control to make the holistic length adaptation of interior vaulting pole 4 in the length of coil body 1, in order to reach extensive suitability. Simultaneously, interior stay plate 4 not only can arrange first axial tension structure to tensioning coil body 1's middle part avoids coil body 1 to appear two end seals, the empty structural defect in centre, and interior stay plate 4 supports tight coil body 1's arc limit through the arc, and then cooperates with tensioning coil body 1's long limit with the radial tension structure of second.

Further, based on the structural characteristics, the space occupied by the inner stay plate 4 is small, and the gap for heat dissipation between the coil body 1 and the iron core is not affected, so that the heat dissipation performance is ensured, and the balance is achieved between the tensioning coil body 1 and the heat dissipation capacity.

Alternatively, as shown in fig. 7, one end of the arc plate is provided with two double-headed screws. And it is easily understood that when the width of the arc-shaped plate is increased, the number of the double-headed screws can be appropriately increased to ensure that the tension is uniformly applied to the coil body 1.

On the basis of the coil, the embodiment also provides an assembly method for the coil, which comprises the following steps:

s100: winding the coil body 1;

s200: the inner supporting plate 4, the upper end hoop 2 and the lower end hoop 3 are installed to replace end sealing and casting molding.

Wherein, in step S200, install upper end hoop 2 and lower extreme hoop 3 again after the installation of inner strut plate 4, promptly:

s201: the inner supporting plate 4 is placed in the middle of the inner periphery of the coil body 1 to tightly press all layers of foils in the middle of the coil body 1;

s202: the upper end hoop 2 is arranged at the upper end of the coil body 1, and the lower end hoop 3 is arranged at the lower end of the coil body 1 so as to axially compress the coil body 1;

s203: and the upper end hoop 2 and the lower end hoop 3 are respectively provided with a second radial tensioning structure, and all layers of foils at two ends of the coil body 1 are compressed tightly through the second radial tensioning structures.

Based on this, the inner brace 4, the upper end hoop 2, the lower end hoop 3 and the second radial tension structure cooperate to compress the coil body 1 into a rigid connection.

Specifically, the inner brace 4 includes two sub-boards 41 disposed opposite to each other and a double-headed screw for connecting the two sub-boards 41. In step S200, the double-threaded screw is screwed to adjust the distance between the two sub-plates 41, so that the length of the whole inner supporting plate 4 is adapted to the length of the coil body 1.

The upper end hoop 2 and the lower end hoop 3 are both constructed as the annular plate adapted to the coil body 1, the second radial tensioning structure comprises a plurality of supporting plates 5 arranged on the annular plate, each supporting plate 5 comprises an adjusting rod 51, a supporting plate body 52 and a nut 53, wherein the adjusting rod 51 is arranged on the annular plate in a penetrating mode and can slide along the radial direction of the annular plate in a reciprocating mode, one end of the adjusting rod 51 is a control end located outside the annular plate, the other end of the adjusting rod 51 is a connecting end located in the annular plate, the supporting plate body 52 is connected with the connecting end of the adjusting rod 51, and the nut 53 is sleeved on the control end of the adjusting rod 51. Then, in step S300, the nut 53 is screwed to slide the adjustment rod 51 back and forth so that the stay plate body 52 abuts against the inner periphery of the coil body 1.

Based on the technical scheme, the assembly method not only provides axial tension through the first axial tension structure, so that two ends of the coil body 1 are effectively tensioned; still provide radial tensile force through fagging 5, fagging 4 in the cooperation to produce radial support at the middle part of coil body 1, avoided among the prior art two end seal, the empty structural defect in centre, for the middle part of coil body 1 provides effective support, effectively solved noise and temperature rise problem.

Finally, it should be noted that: the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a coil, a serial communication port, including coil body (1), be located coil body (1) upper end hoop (2) and lower extreme hoop (3) and be located interior fagging (4) of circle body (1) interior week middle part of coil body (1) upper end and lower extreme respectively, wherein, coil body (1) cover is established on the iron core, upper end hoop (2) and lower extreme hoop (3) are all constructed for loop configuration and constitute first axial tension structure, first axial tension structure is used for coil body (1) both ends to insulate to seal and axial compresses tightly, interior fagging (4) assemble at the interior middle part of circle body (1) interior week and constitute first radial tension structure with coil body (1), and leave the clearance between interior fagging (4) and the iron core in order to form heat dissipation channel.

The first axial tensioning structure and two ends of the coil body (1) form an insulation packaging structure to ensure that a safe insulation distance is formed between the two ends of the coil body (1) and the iron core, and the first axial tensioning structure and the coil body (1) and the iron core form the first axial tensioning structure to ensure that the relative position between the coil body (1) and the iron core is unchanged during the operation of the transformer.

2. A coil according to claim 1, characterized in that the inner circumference of the upper end band (2) and the inner circumference of the lower end band (3) are provided with a second radial tensioning for radially compressing the coil body (1), respectively.

3. A coil according to claim 2, characterized in that the upper end hoop (2) and the lower end hoop (3) are both constructed as annular plates adapted to the coil body (1), a plurality of supporting plates (5) capable of reciprocating in the radial direction of the annular plates are uniformly arranged on the annular plates, and all the supporting plates (5) constitute the second radial tensioning structure.

4. The coil of claim 3, wherein the supporting plate (5) comprises an adjusting rod (51), a supporting plate body (52) and a nut (53), wherein the adjusting rod (51) is arranged on the annular plate in a penetrating way and can slide back and forth along the radial direction of the annular plate, one end of the adjusting rod (51) extends into the annular plate and is connected with the supporting plate body (52) to form a connecting end, the other end of the adjusting rod (51) extends out of the annular plate and is connected with the nut (53) to form a control end, and the nut (53) is used for driving the adjusting rod (51) to slide back and forth along the radial direction of the annular plate;

the control end of the adjusting rod (51) is moved along the radial direction of the annular plate so as to drive the supporting plate body (52) to move along the radial direction of the coil body (1) and press or loosen the inner periphery of the coil body (1).

5. The coil according to claim 4, wherein the bracing plate body (52) comprises a base plate (521), a resisting plate (522) and a sliding support (523), the base plate (521) is connected with the connecting end of the adjusting rod (51), the resisting plate (522) is connected with the base plate (521) through the sliding support (523), one end of the sliding support (523) is arranged on the base plate (521) in a sliding manner through a roller, and the other end of the sliding support (523) is connected with the resisting plate (522) through a hinge; correspondingly, a sliding groove matched with the roller is arranged on the base plate (521);

when the substrate (521) moves along the radial direction of the coil body (1), the roller slides up and down in the sliding groove of the substrate (521) so as to adjust the radial distance between the abutting plate (522) and the inner periphery of the coil body (1).

6. A coil according to claim 3, wherein a plurality of heat dissipating grooves (61) are provided on the annular plate, and correspondingly, a plurality of vent holes are provided on the coil body (1), and the heat dissipating grooves (61) are in one-to-one correspondence with and communicate with the vent holes.

7. The coil as claimed in claim 1, wherein the upper end hoop (2) is provided with a connecting groove (201) for connecting the copper bar (7), a clamping plate (202) is arranged in the connecting groove (201), and the clamping plate (202) separates the connecting groove (201) into two sub-grooves;

two first screw holes (203) are arranged in the radial direction of the upper end hoop (2), two second screw holes (204) are arranged on the clamping plate (202), the first screw holes (203) and the second screw holes (204) are arranged in a one-to-one correspondence manner, and the corresponding first screw holes (203) are communicated with the second screw holes (204) to form adjusting holes for adjusting the position of the clamping plate (202); correspondingly, the adjusting hole is provided with a bolt for connecting the upper end hoop (2) and the clamping plate (202) in a penetrating way.

8. The coil according to claim 1, wherein a plurality of supporting columns (62) are uniformly arranged on the top surface of the upper end hoop (2) and the bottom surface of the lower end hoop (3) respectively, the supporting columns (62) are in a cone frustum shape, and the supporting columns (62) are integrally formed with the upper end hoop (2) or the lower end hoop (3) respectively;

when the coil is used for transformer assembly, the supporting column (62) is connected with the upper clamping piece and the lower clamping piece of the iron core and forms a second axial tensioning structure.

9. The coil according to claim 1, wherein the inner support plate (4) comprises two oppositely arranged sub-plates (41) and a double-threaded screw for connecting the two sub-plates (41), the sub-plates (41) are configured to be adapted to the arc-shaped plate of the coil body (1), and the two ends of the sub-plates (41) are respectively connected with the double-threaded screw;

reverse threads with opposite rotation directions are arranged on the double-thread screw, and the double-thread screw is rotated to enable the sub-plate (41) to reciprocate along the circumferential direction of the coil body (1) so that the sub-plate (41) can press or loosen the inner circumference of the coil body (1).

10. An assembly method for a coil according to any one of claims 1 to 9, comprising the steps of:

winding the coil body (1);

installing an inner supporting plate (4), an upper end hoop (2) and a lower end hoop (3) to replace an end sealing structure molded by casting at two ends of the coil body (1);

wherein, the upper end hoop (2) and the lower end hoop (3) are installed after the inner supporting plate (4) is installed;

the inner supporting plate (4) is placed in the middle of the inner periphery of the coil body (1) to compress each layer of foil material in the middle of the coil body (1);

the upper end hoop (2) is arranged at the upper end of the coil body (1), and the lower end hoop (3) is arranged at the lower end of the coil body (1) so as to axially compress the coil body (1);

the upper end hoop (2) and the lower end hoop (3) are respectively provided with a second radial tensioning structure, each layer of foil at the two ends of the coil body (1) is compressed through the second radial tensioning structures, and the inner supporting plate (4), the upper end hoop (2), the lower end hoop (3) and the second radial tensioning structures are matched to compress the coil body (1) into a rigid connector.