Coil and assembly method

Abstract

The present invention discloses a coil and an assembly method. A coil includes a coil body, an upper end hoop, a lower end hoop and an inner support plate. The upper end hoop and the lower end hoop constitute a first axial tensioning structure, and the inner support plate is used to tension the inner circumference of the coil body and form a heat dissipation channel. An assembly method for the coil includes the following steps: the coil body is wound; the inner support plate is placed in the middle of the inner circumference of the coil body; the upper end hoop and the lower end hoop are respectively fixed to the upper end and the lower end of the coil body; wherein the upper end hoop and the lower end hoop are respectively provided with a second radial tensioning structure for tensioning the long side of the coil body. Based on this, both axial tensioning force and radial tensioning force are provided, and the inner support plate is cooperated to fully support the coil body, effectively solving the noise and temperature rise problems.

Description

Technical Field

[0001] The invention belongs to the technical field of distribution transformer coils, and in particular relates to a coil and an assembly method. Background Art

[0002] In the prior art, the coil of the distribution transformer adopts an end-sealed structure to ensure the stability of its structure. The existing end-sealed structure is cast with epoxy resin, but has the following characteristics during actual use: the two ends are sealed and the middle is empty, so the middle structure of the coil is loose, which is easy to generate noise and temperature rise during use.

[0003] In view of this, the prior art solves the above-mentioned problem by setting a support bar, and in order to ensure the stability of the support bar, the two ends of the support bar respectively abut the inner circumference of the coil and the iron core located inside the coil, but the use of the support bar has the following problems: first, the heat dissipation gap between the coil and the iron core is occupied by the support bar, the heat dissipation effect becomes worse, and the more support bars there are, the worse the heat dissipation; second, the support bar connects the coil and the iron core, and the support bar transfers heat between the two, making the temperature rise of the coil and the temperature rise of the iron core consistent, reducing the service life of both. Summary of the invention

[0004] The object of the present invention is to provide a coil and an assembly method to solve the above problems existing in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] In the first aspect, the present invention provides a coil, comprising a coil body, an upper end hoop and a lower end hoop respectively located at the upper end and the lower end of the coil body, and an inner support plate located at the middle of the inner circumference 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 as an annular structure and constitute a first axial tensioning structure, the first axial tensioning structure is used for insulating and axially pressing the two ends of the coil body, the inner support plate is assembled in the middle of the inner circumference of the coil body and constitutes a first radial tensioning structure with the coil body, and a gap is left between the inner support plate and the iron core to form a heat dissipation channel.

[0007] On the one hand, the first axial tensioning structure forms an insulating encapsulation structure with the two ends of the coil body to ensure a safe insulation distance between the two ends of the coil body and the iron core. On the other hand, it forms a first axial tensioning structure with the coil body and the iron core to ensure that the relative position between the coil body and the iron core remains unchanged when the transformer is running.

[0008] In a possible design, a second radial tensioning structure for radially compressing the coil body is respectively provided on the inner circumference of the upper end hoop and the inner circumference of the lower end hoop.

[0009] In a possible design, the upper end hoop and the lower end hoop are both constructed as an annular plate adapted to the coil body, and a plurality of support plates capable of radially reciprocating along the annular plate are evenly arranged on the annular plate, and all the support plates constitute the second radial tensioning structure.

[0010] In a possible design, the support plate includes an adjusting rod, a support plate body and a nut, wherein the adjusting rod is inserted into the annular plate and can slide back and forth in the radial direction of the annular plate, one end of the adjusting rod extends into the annular plate and is connected to the support plate body to form a connecting end, and the other end of the adjusting rod extends outside the annular plate and is connected to the nut to form a control end, and the nut is used to drive the adjusting rod to slide back and forth in the radial direction of the annular plate;

[0011] The control end of the adjusting rod is moved radially along the annular plate to drive the support plate body to move radially along the coil body to compress or loosen the inner circumference of the coil body.

[0012] In a possible design, the support plate body includes a base plate, a backing plate and a sliding bracket, the base plate is connected to the connecting end of the adjustment rod, the backing plate is connected to the base plate through the sliding bracket, one end of the sliding bracket is slidably arranged on the base plate through a roller, and the other end of the sliding bracket is connected to the backing plate through a hinge; accordingly, a sliding groove adapted to the roller is provided on the base plate;

[0013] When the substrate moves radially along the coil body, the roller substrate slides up and down in the slide groove to adjust the radial distance between the abutment plate and the inner circumference of the coil body.

[0014] In a possible design, a plurality of heat dissipation grooves are provided on the annular plate, and correspondingly, a plurality of ventilation holes are provided on the coil body, and the heat dissipation grooves correspond to and are connected with the ventilation holes one by one.

[0015] In a possible design, a connection groove for connecting the copper busbar is provided on the upper end hoop, a clamping plate is provided in the connection groove, and the clamping plate divides the connection groove into two sub-grooves;

[0016] Two first screw holes are provided in the radial direction of the upper end hoop, and two second screw holes are provided on the clamping plate. The first screw holes and the second screw holes are arranged in a one-to-one correspondence. The corresponding first screw holes are connected with the second screw holes to form an adjustment hole for adjusting the position of the clamping plate; accordingly, bolts for connecting the upper end hoop and the clamping plate are passed through the adjustment hole.

[0017] In a possible design, a plurality of support columns are evenly arranged on the top surface of the upper hoop and the bottom surface of the lower hoop, respectively. The support columns are in the shape of a truncated cone, and the support columns are integrally formed with the upper hoop or the lower hoop.

[0018] When the coil is used for transformer assembly, the support column is connected to the upper and lower clamps of the iron core to form a second axial tensioning structure.

[0019] In a possible design, the inner support plate includes two oppositely arranged sub-plates and a double-headed screw for connecting the two sub-plates, the sub-plate is constructed as an arc-shaped plate adapted to the coil body, and the two ends of the sub-plate are respectively connected to the double-headed screw;

[0020] The double-headed screw is provided with reverse threads with opposite rotation directions. The double-headed screw is rotated to make the sub-plate reciprocate along the circumference of the coil body, so that the sub-plate presses or loosens the inner circumference of the coil body.

[0021] In a second aspect, the present invention provides a method for assembling the coil, comprising the following steps:

[0022] Coil body winding;

[0023] Install inner support plates, upper end hoops and lower end hoops to replace the end sealing structures cast at both ends of the coil body;

[0024] Among them, the upper end hoop and the lower end hoop are installed after the inner support plate is installed;

[0025] The inner support plate is placed in the middle of the inner circumference of the coil body to compress the foil layers in the middle of the coil body;

[0026] The upper end hoop is installed at the upper end of the coil body, and the lower end hoop is installed at the lower end of the coil body to axially compress the coil body;

[0027] The upper end hoop and the lower end hoop are respectively provided with a second radial tensioning structure, through which the foil layers at both ends of the coil body are compressed, and the inner support plate, the upper end hoop, the lower end hoop and the second radial tensioning structure cooperate to compress the coil body into a rigid connection body.

[0028] Beneficial effects:

[0029] The existing cast end sealing structure is replaced by the formed upper end hoop and lower end hoop, which effectively simplifies the process difficulty and manufacturing cycle of the coil body end sealing.

[0030] 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 cooperates with the second radial tensioning structure to decompose the single axial force borne by the coil body during assembly into an axial pressure along the axial direction of the coil body and an axial friction force generated by the radial pressure. This not only solves the problem of deformation or cracking of the coil body due to excessive single axial force, but also forms a rigid connection at both ends of the coil body, thereby solving the noise and heat dissipation problems during the operation of the transformer.

[0031] The inner support plate is used to radially tension the middle part of the coil body, so that there is no enclosed air between the layers of foil in the middle part of the coil body. At the same time, the radial tensioning force forms a rigid connection in the middle part of the coil body, fundamentally solving the problems of temperature rise and excessive noise that have not been solved in the industry for many years.

[0032] The existing spacer structure is replaced by the support columns on the upper end hoop and the lower end hoop, which simplifies the structure and assembly parts of the transformer, reduces the assembly workload and improves the structural stability, increases the ventilation area of ​​the coil end, and improves the heat dissipation capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the structure of a coil.

[0034] Figure 2 This is a schematic diagram of a partially enlarged structure of the upper part of a coil.

[0035] Figure 3 It is a schematic diagram of the structure of the upper end hoop.

[0036] Figure 4 It is a schematic diagram of the structure of the lower end hoop.

[0037] Figure 5 It is a structural diagram of the support plate.

[0038] Figure 6 It is a schematic diagram of the cross-sectional structure of the connection between the upper end hoop and the copper busbar.

[0039] Figure 7 It is a structural schematic diagram of the inner support plate.

[0040] In the figure:

[0041] 1. Coil body; 2. Upper end hoop; 201. Connecting groove; 202. Clamp; 203. First screw hole; 204. Second screw hole; 3. Lower end hoop; 4. Inner support plate; 41. Sub-plate; 42. Stud bolt; 5. Support plate; 51. Adjustment rod; 52. Support plate body; 521. Base plate; 522. Abutment plate; 523. Sliding bracket; 53. Nut; 61. Heat sink; 62. Support column; 7. Copper busbar. DETAILED DESCRIPTION

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0043] Example:

[0044] like Figure 1-Figure 7As shown, this 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 support plate 4 located at the middle of the inner circumference of the coil body 1, wherein the coil body 1 is sleeved on the iron core, the upper end hoop 2 and the lower end hoop 3 are both constructed as annular structures and constitute a first axial tensioning structure, the first axial tensioning structure is used for insulating and axially pressing the two ends of the coil body 1, the inner support plate 4 is assembled in the middle of the inner circumference of the coil body 1 and constitutes a first radial tensioning structure with the coil body 1, and a gap is left between the inner support plate 4 and the iron core to form a heat dissipation channel.

[0045] On the one hand, the first axial tensioning structure forms an insulating encapsulation structure with the two ends of the coil body 1 to ensure a safe insulation distance between the two ends of the coil body 1 and the iron core. On the other hand, it forms a first axial tensioning structure with the coil body 1 and the iron core to ensure that the relative position between the coil body 1 and the iron core remains unchanged when the transformer is running.

[0046] In view of the problems existing in the prior art, the coil forms a first axial tensioning structure through the upper end hoop 2 and the lower end hoop 3 and applies axial tensioning force to the coil body 1. The first axial tensioning structure cooperates with the second radial tensioning structure to decompose the single axial force borne by the coil body 1 during assembly into an axial pressure along the axial direction of the coil body 1 and an axial friction force generated by the radial pressure. This not only solves the problem of deformation or cracking of the coil body 1 due to excessive single axial force, but also forms a rigid connection at both ends of the coil body 1, thereby solving the noise and heat dissipation problems during the operation of the transformer.

[0047] The upper end hoop 2 and the lower end hoop 3 cooperate to tension the two ends of the coil body 1, and the inner support plate 4 is used to tension the middle part of the coil body 1, so that the layers of the coil body 1 are compacted to form a rigid whole, which not only reduces the vibration of the low-voltage coil body 1 during operation, but also makes the layers of the coil body 1 in close contact to accelerate heat transfer. And on the basis of ensuring the tensioning effect, the inner support plate 4 forms a heat dissipation channel, which further ensures the heat dissipation effect. Based on this, the noise problem during the operation of the coil body 1 is solved, and the problem of temperature transmission is solved by pressing the coil body 1.

[0048] like Figure 1 As shown, the coil body 1 is in the shape of an oval, and the coil body 1 is a closed structure consisting of two semicircular sides and two long sides. After actual winding, the long sides of the coil body 1 appear to be stretched, but are actually in a loose state. Similarly, when the coil body 1 is in the shape of an oblong, the long sides of the coil body 1 are in a loose state after winding, and noise is likely to occur during use.

[0049] The combination of the first axial tensioning structure and the inner support plate 4 effectively solves the problem of the loose structure of the coil body 1 in the axial direction and avoids the generation of noise, but the tensioning effect on the long side of the coil body 1 is poor. Therefore, preferably, the inner circumference of the upper end hoop 2 and the inner circumference of the lower end hoop 3 are respectively provided with a second radial tensioning structure for tensioning the long side of the coil body 1.

[0050] Based on the above design scheme, on the one hand, the second radial tensioning structure is used to apply radial force to the inner circumference of both ends of the coil body 1, and compact the layers at both ends of the coil body 1 to form a rigid whole, so as to enhance the radial overall structural strength of the non-circular coil. When the upper end hoop 2 and the lower end hoop 3 contact 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 foil layers at both ends of the coil body 1. On the other hand, the second radial tensioning structure and the inner circumference of the coil body 1 generate axial friction due to the radial force, so as to share the axial pressure of the load-bearing at both ends of the coil body.

[0051] In this embodiment, the upper end hoop 2 and the lower end hoop 3 are both constructed as an annular plate adapted to the coil body 1, and a plurality of support plates 5 that can reciprocate along the radial direction of the annular plate are evenly arranged on the annular plate, and all the support plates 5 constitute the second radial tensioning structure. Based on the above design scheme, the annular plate is adapted to the coil body 1 to ensure the pressing performance and ensure that the axial tensioning force acts on the coil body 1. And the annular plate is provided with a plurality of mounting holes adapted to the support plates 5, and the mounting holes are arranged one by one with the support plates 5.

[0052] The support plate 5 has sliding properties to adapt to coil bodies 1 with different inner diameters, thereby increasing the scope of use and practicality. The support plates 5 are independent of each other, and each support plate 5 can be adjusted individually. Therefore, in actual use, the position of each support plate 5 can be adjusted individually according to the tensioning requirements to achieve the best tensioning effect.

[0053] It is easy to understand that the annular plate is adapted to the coil body 1, and the annular plate also includes two arc-shaped sides and two long sides. Then, preferably, Figure 3 and Figure 4 As shown, a plurality of support plates 5 are evenly distributed on the two arc-shaped sides of the annular plate. Based on this, the support plates 5 tighten the arc-shaped sides of the coil body 1, thereby stretching the long sides of the coil body 1 to achieve tensioning of the entire coil body 1. The coil body 1 has better stability during use, and the noise and temperature rise are improved. Optionally, at least two support plates 5 are provided on each arc-shaped side of the annular plate, including but not limited to Figure 4 Three support plates 5 are shown.

[0054] The structure of the support plate 5 includes but is not limited to: the support plate 5 includes an adjusting rod 51, a support plate body 52 and a nut 53, wherein the adjusting rod 51 is passed through the annular plate and can slide back and forth in the radial direction of the annular plate, one end of the adjusting rod 51 extends into the annular plate and is connected to the support plate body 52 to form a connecting end, and the other end of the adjusting rod 51 extends outside the annular plate and is connected to the nut 53 to form a control end, and the nut 53 is used to drive the adjusting rod 51 to slide back and forth in the radial direction of the annular plate; the control end of the adjusting rod 51 is moved radially along the annular plate to drive the support plate body 52 to move radially along the coil body 1 to tighten or loosen the inner circumference of the coil body 1.

[0055] Based on this, the adjusting rod 51 is convenient for the staff to use through the extended control end. The staff makes the adjusting rod 51 slide back and forth along the mounting hole, and the support plate body 52 connected to the adjusting rod 51 also slides, so that the distance between the support plate body 52 and the coil body 1 changes. When the support plate body 52 abuts against the coil body 1, the support plate body 52 applies radial tension to the coil body 1 to achieve the purpose of tensioning the coil body 1.

[0056] Furthermore, the support plate body 52 is located on the inner side of the annular plate, and the radial tensioning force applied by the support plate body 52 is an outward thrust rather than an inward thrust. The outward thrust can not only tension the coil body 1, but also prevent the coil body 1 from deforming, thereby ensuring the normal use of the coil body 1.

[0057] At the same time, if Figure 5 As shown, the control end of the adjusting rod 51 is provided with a thread extending toward the connecting end, and when the adjusting rod 51 is plugged into the annular plate, the control end is sleeved with a nut 53. Based on this, by screwing the nut 53 to control the reciprocating sliding of the adjusting rod 51, the combination of the nut 53 and the adjusting rod 51 is not only simple in structure and convenient in operation, but also economical and reduces costs.

[0058] Preferably, the support plate body 52 includes a base plate 521, a support plate 522 and a sliding bracket 523, the base plate 521 is connected to the connecting end of the adjusting rod 51, the support plate 522 is connected to the base plate 521 through the sliding bracket 523, one end of the sliding bracket 523 is slidably set on the base plate 521 through a roller, and the other end of the sliding bracket 523 is connected to the support plate 522 through a hinge; accordingly, a sliding groove adapted for the roller is provided on the base plate 521; when the base plate 521 moves radially along the coil body 1, the roller slides up and down on the base plate 521 to adjust the radial distance between the support plate 522 and the inner circumference of the coil body 1.

[0059] Based on this, when the support plate body 52 abuts against the coil body 1, the sliding bracket 523 is deformed under pressure, so that the abutting plate 522 is evenly pressed on the coil body 1, and the radial tensioning force acts evenly to avoid local stress concentration.

[0060] Optionally, the sliding bracket 523 includes two supporting rods, the middle parts of the two supporting rods are hinged to each other and form an X shape, one end of the supporting rod is connected to the abutment plate 522, and the other end of the supporting rod is slidably arranged on the base plate 521 through a roller.

[0061] In a possible implementation, a plurality of heat dissipation grooves 61 are provided on the annular plate, and correspondingly, a plurality of ventilation holes are provided on the coil body 1, and the heat dissipation grooves 61 correspond to and are connected with the ventilation holes one by one. Based on the above technical solution, the heat dissipation grooves 61 and the ventilation holes on the coil body 1 form a heat dissipation channel, which increases air flow performance, improves heat dissipation capacity, and reduces the temperature rise of the coil body 1 during use.

[0062] It is easy to understand that the layout position and shape of the heat dissipation slot 61 are designed according to the structure of the coil body 1. Optionally, as Figure 3 and Figure 4 As shown, the heat dissipation groove 61 includes a rectangular groove located at the long side of the annular plate and an arc groove located on the arc side of the annular plate.

[0063] The upper end hoop 2 and the lower end hoop 3 have the same function, so in order to save costs, the two are basically the same in structure, but the upper end hoop 2 needs to be provided with a copper bar 7 to connect the power 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, and a clamping plate 202 is provided in the connecting groove 201, and the clamping plate 202 separates the connecting groove 201 into two sub-grooves.

[0064] Based on the above technical solution, the copper bar 7 is connected through the connection groove 201, and the copper bar 7 is fixed by the clamping plate 202 to prevent the copper bar 7 from shaking during operation. At the same time, the connection groove 201 is divided into two sub-grooves by the clamping plate 202, each of which can be connected to a copper bar 7, thereby realizing the connection of multiple copper bars 7. In addition, through the arrangement of the connection groove 201 and the clamping plate 202, the upper end hoop 2 is also different in structure from the lower end hoop 3, which is conducive to identification and reduces the probability of misuse.

[0065] Preferably, if Figure 6 As shown, two first screw holes 203 are provided in the radial direction of the upper end hoop 2, and two second screw holes 204 are provided on the clamping plate 202. The first screw holes 203 and the second screw holes 204 are arranged in a one-to-one correspondence. The corresponding first screw holes 203 are connected to the second screw holes 204 and form an adjustment hole for adjusting the position of the clamping plate 202; accordingly, bolts for connecting the upper end hoop 2 and the clamping plate 202 are passed through the adjustment hole.

[0066] Based on this, the threaded rod is inserted into the adjustment hole to adjust the position of the clamping plate 202 to adjust the volume of the two sub-troughs, and the sub-troughs adapt to the connection end of the copper bar 7 and fix the copper bar 7. Optionally, the adjustment holes can be set on the same side or on both sides of the clamping plate 202 respectively.

[0067] In a possible implementation, a plurality of support columns 62 are evenly arranged on the top surface of the upper end hoop 2 and the bottom surface of the lower end hoop 3, and the support columns 62 are in the shape of a truncated cone. Based on the above technical solution, the support columns 62 on the upper end hoop 2 and the lower end hoop 3 replace the existing pad structure, simplifying the structure and assembly parts of the transformer, reducing the assembly workload, improving the structural stability, and increasing the ventilation area of ​​the coil end, thereby improving the heat dissipation capacity. Optionally, the support column 62 can also be constructed in the shape of a truncated cone.

[0068] Preferably, the support column 62 is formed integrally with the upper end hoop 2 or the lower end hoop 3. Based on this, the number of system components is reduced and the stability of the structure is improved.

[0069] When the coil is used for transformer assembly, the support column 62 is connected to the upper and lower clamps of the core and forms a second axial tensioning structure. Based on this, adjacent coils are axially compressed without interfering with heat dissipation. It is easy to understand that the upper and lower clamps are prior art and will not be described in detail here.

[0070] In this embodiment, the inner support plate 4 includes two oppositely arranged sub-plates 41 and a double-headed screw for connecting the two sub-plates 41. The sub-plate 41 is constructed as an arc-shaped plate adapted to the coil body 1, and the two ends of the sub-plate 41 are respectively connected to the double-headed screw; the double-headed screw is provided with a reverse thread with opposite rotation direction, and the double-headed screw is rotated to make the sub-plate 41 reciprocate along the circumference of the coil body 1, so that the sub-plate 41 tightens or loosens the inner circumference of the coil body 1.

[0071] Based on the above technical solution, for coil bodies 1 of different lengths, the inner support plate 4 controls the distance between the two sub-plates 41 by screwing the double-headed screw, so that the overall length of the inner support plate 4 is adapted to the length of the coil body 1, so as to achieve wide applicability. At the same time, the inner support plate 4 can not only cooperate with the first axial tensioning structure to tension the middle of the coil body 1 to avoid the structural defect of the coil body 1 being sealed at both ends and hollow in the middle, but also the inner support plate 4 presses against the arcuate edge of the coil body 1 through the arc plate, and then cooperates with the second radial tensioning structure to tension the long side of the coil body 1.

[0072] Furthermore, based on the structural characteristics, the inner support plate 4 occupies a small space and will not affect the heat dissipation gap between the coil body 1 and the iron core, thereby ensuring the heat dissipation performance and achieving a balance between tensioning the coil body 1 and maintaining the heat dissipation capacity.

[0073] Alternatively, if Figure 7 As shown, two double-headed screws are provided at one end of the arc-shaped plate. It is easy to understand that when the width of the arc-shaped plate increases, the number of double-headed screws can be appropriately increased to ensure that the tensioning force acts evenly on the coil body 1.

[0074] Based on the coil, this embodiment also provides an assembly method for the coil, comprising the following steps:

[0075] S100: Winding of coil body 1;

[0076] S200: Install the inner support plate 4, the upper end hoop 2 and the lower end hoop 3 to replace the end seal and casting molding.

[0077] Among them, in step S200, the upper end hoop 2 and the lower end hoop 3 are installed after the inner support plate 4 is installed, that is:

[0078] S201: The inner support plate 4 is placed in the middle of the inner periphery of the coil body 1 to compress the foil layers in the middle of the coil body 1;

[0079] S202: The upper end hoop 2 is installed at the upper end of the coil body 1, and the lower end hoop 3 is installed at the lower end of the coil body 1, so as to axially compress the coil body 1;

[0080] S203: A second radial tensioning structure is provided on the upper end hoop 2 and the lower end hoop 3 respectively, and the foil layers at both ends of the coil body 1 are compressed by the second radial tensioning structure.

[0081] Based on this, the inner support plate 4, the upper end hoop 2, the lower end hoop 3 and the second radial tensioning structure cooperate to compress the coil body 1 into a rigid connection body.

[0082] Specifically, the inner support plate 4 includes two oppositely disposed sub-plates 41 and a double-headed screw for connecting the two sub-plates 41. In step S200, the double-headed screw is screwed to adjust the distance between the two sub-plates 41 so that the overall length of the inner support plate 4 is adapted to the length of the coil body 1.

[0083] The upper end hoop 2 and the lower end hoop 3 are both constructed as an annular plate adapted to the coil body 1. The second radial tensioning structure includes a plurality of support plates 5 arranged on the annular plate. The support plates 5 include an adjusting rod 51, a support plate body 52 and a nut 53. The adjusting rod 51 is passed through the annular plate and can slide back and forth along the radial direction of the annular plate. One end of the adjusting rod 51 is a control end located outside the annular plate, and the other end of the adjusting rod 51 is a connecting end located inside the annular plate. The support plate body 52 is connected to 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 make the adjusting rod 51 slide back and forth, so that the support plate body 52 abuts against the inner circumference of the coil body 1.

[0084] Based on the above technical scheme, the assembly method not only provides axial tensioning force through the first axial tensioning structure to effectively tension the two ends of the coil body 1; it also provides radial tensioning force through the support plate 5, and cooperates with the inner support plate 4 to generate radial support in the middle of the coil body 1, avoiding the structural defects of the prior art of sealed ends and hollow in the middle, providing effective support for the middle of the coil body 1, and effectively solving the noise and temperature rise problems.

[0085] 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 protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A coil, characterized in that: The invention comprises 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 support plate (4) located at the middle of the inner circumference of the coil body (1), wherein the coil body (1) is sleeved on the iron core, the upper end hoop (2) and the lower end hoop (3) are both constructed as an annular structure and constitute a first axial tensioning structure, the first axial tensioning structure is used for insulating and encapsulating the two ends of the coil body (1) and axially pressing, the inner support plate (4) is assembled at the middle of the inner circumference of the coil body (1) and constitutes a first radial tensioning structure with the coil body (1), and a gap is left between the inner support plate (4) and the iron core to form a heat dissipation channel; the first axial tensioning structure, on the one hand, constitutes an insulating encapsulation structure with the two ends of the coil body (1) to ensure that a safe insulation distance is formed between the two ends of the coil body (1) and the iron core, and on the other hand, constitutes a first axial tensioning structure with the coil body (1) and the iron core to ensure that the relative position between the coil body (1) and the iron core remains unchanged when the transformer is running; A second radial tensioning structure for radially pressing the coil body (1) is respectively provided on the inner periphery of the upper end hoop (2) and the inner periphery of the lower end hoop (3); the upper end hoop (2) and the lower end hoop (3) are both constructed as an annular plate adapted to the coil body (1), and a plurality of support plates (5) capable of radially reciprocating along the annular plate are evenly provided on the annular plate, and all the support plates (5) constitute the second radial tensioning structure; the support plate (5) comprises an adjusting rod (51), a support plate body (52) and a nut (53), wherein the adjusting rod (51) is passed through the annular plate and can slide back and forth in the radial direction of the annular plate, one end of the adjusting rod (51) extends into the annular plate and is connected to the support plate body (52) to form a connecting end, and the other end of the adjusting rod (51) extends outside the annular plate and is connected to the nut (53) to form a control end, and the nut (53) is used to drive the adjusting rod (51) to slide back and forth in the radial direction of the annular plate; The control end of the adjusting rod (51) is moved radially along the annular plate to drive the support plate body (52) to move radially along the coil body (1) to tighten or loosen the inner circumference of the coil body (1); the support plate body (52) comprises a base plate (521), a contact plate (522) and a sliding bracket (523); the base plate (521) is connected to the connecting end of the adjusting rod (51); the contact plate (522) is connected to the base plate (521) via the sliding bracket (523); one end of the sliding bracket (523) is slidably arranged on the base plate (521) via a roller; the other end of the sliding bracket (523) is connected to the contact plate (522) via a hinge; accordingly, a slide groove adapted to the roller is provided on the base plate (521); when the base plate (521) moves radially along the coil body (1), the roller slides up and down in the slide groove of the base plate (521) to adjust the radial distance between the contact plate (522) and the inner circumference of the coil body (1); The inner support plate (4) comprises two oppositely arranged sub-plates (41) and a double-headed screw for connecting the two sub-plates (41); the sub-plate (41) is constructed as an arc-shaped plate adapted to the coil body (1); the two ends of the sub-plate (41) are respectively connected to the double-headed screw; the double-headed screw is provided with reverse threads with opposite rotation directions; the double-headed screw is rotated to make the sub-plate (41) reciprocate along the circumference of the coil body (1), so that the sub-plate (41) presses or loosens the inner circumference of the coil body (1).

2. The coil according to claim 1, characterized in that The annular plate is provided with a plurality of heat dissipation grooves (61), and correspondingly, the coil body (1) is provided with a plurality of ventilation holes, and the heat dissipation grooves (61) correspond to and are connected with the ventilation holes one by one.

3. The coil according to claim 1, characterized in that The upper end hoop (2) is provided with a connection groove (201) for connecting the copper busbar (7), a clamping plate (202) is provided in the connection groove (201), and the clamping plate (202) divides the connection groove (201) into two sub-grooves; Two first screw holes (203) are provided in the radial direction of the upper end hoop (2), and two second screw holes (204) are provided on the clamping plate (202). The first screw holes (203) and the second screw holes (204) are arranged in a one-to-one correspondence. The corresponding first screw holes (203) and the second screw holes (204) are connected to form an adjustment hole for adjusting the position of the clamping plate (202); accordingly, a bolt for connecting the upper end hoop (2) and the clamping plate (202) is passed through the adjustment hole.

4. The coil according to claim 1, characterized in that A plurality of support columns (62) are evenly arranged on the top surface of the upper end hoop (2) and the bottom surface of the lower end hoop (3), respectively. The support columns (62) are in the shape of a truncated cone, and the support columns (62) are integrally formed with the upper end hoop (2) or the lower end hoop (3). When the coil is used for transformer assembly, the support column (62) is connected to the upper and lower clamps of the iron core to form a second axial tensioning structure.

5. A method for assembling the coil according to any one of claims 1 to 4, characterized in that: The following steps are involved: Winding the coil body (1); An inner support plate (4), an upper end hoop (2) and a lower end hoop (3) are installed to replace the end sealing structure cast at both ends of the coil body (1); Wherein, the upper end hoop (2) and the lower end hoop (3) are installed after the inner support plate (4) is installed; The inner support plate (4) is placed in the middle of the inner periphery of the coil body (1) to compress the foil layers in the middle of the coil body (1); The upper end hoop (2) is installed at the upper end of the coil body (1), and the lower end hoop (3) is installed at the lower end of the coil body (1) 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, and the foil layers at both ends of the coil body (1) are compressed by the second radial tensioning structure, and the inner support plate (4), the upper end hoop (2), the lower end hoop (3) and the second radial tensioning structure cooperate to compress the coil body (1) into a rigid connection body.

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