A dry variable coil forming die and dry variable coil forming process

Abstract

The application relates to a dry transformer coil forming die and a dry transformer coil forming process, and belongs to the dry transformer field. The dry transformer coil forming die comprises a forming die base, a forming outer die, a forming inner die and an arc-shaped cooling plate; the forming inner die comprises an inner die cylinder, a lower die plate sleeved at the lower end of the inner die cylinder and an upper die plate sleeved at the upper end of the inner die cylinder; the upper die plate is provided with an upper positioning groove for inserting the arc-shaped cooling plate; the lower die plate is provided with a lower positioning groove for inserting the arc-shaped cooling plate; the forming die base comprises a die base plate, a locking column installed on the die base plate, and a locking assembly installed on the locking column and used for uniformly pressing the forming outer die and the forming inner die on the die base plate. In the dry transformer coil forming process, the arc-shaped cooling plate is used for forming a heat dissipation air duct, the cross section of a single heat dissipation air duct is increased, and the heat dissipation effect of the formed dry transformer coil is more ideal.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of dry-type transformers, in particular to a dry-type transformer coil forming die and a dry-type transformer coil forming process. BACKGROUND

[0002] A dry-type transformer coil is an important component of a dry-type transformer. The dry-type transformer coil includes a copper coil module for conducting electricity and an insulating shell for insulating the copper coil module. When the number of layers of the copper coil module in the dry-type transformer coil is greater than or equal to two, a heat dissipation air duct is arranged between the adjacent two layers of the copper coil module and penetrates the upper and lower ends of the insulating shell, which is used to improve the heat dissipation effect of the dry-type transformer coil.

[0003] The forming process of the dry-type transformer coil includes winding, pouring forming, and demolding. During the winding step, the operator will arrange a plurality of drawing rods between the adjacent two layers of the copper coil module in a circumferential direction, and after pouring forming of the dry-type transformer coil, the drawing rods are pulled out from the formed dry-type transformer coil, thereby forming the heat dissipation air duct. When the dry-type transformer coil is set, the total cross-sectional area of the heat dissipation air duct required is set according to the power-on level of the dry-type transformer coil.

[0004] In the above related technology, since the cross section of the formed heat dissipation air duct is determined by the cross section of the arranged drawing rod, the cross-sectional area of the formed heat dissipation air duct is small. SUMMARY

[0005] In order to increase the cross section of a single heat dissipation air duct in the dry-type transformer coil, the present application provides a dry-type transformer coil forming die and a dry-type transformer coil forming process.

[0006] In a first aspect, the present application provides a dry-type transformer coil forming die, which adopts the following technical solution:

[0007] A dry-type transformer coil forming die, comprising a forming die base, a forming outer die, a forming inner die, and an arc-shaped cooling plate for forming a heat dissipation air duct; the forming outer die has an outer die chamber penetrating the upper and lower ends; the forming inner die comprises an inner die cylinder, a lower die plate sleeved to the lower end of the inner die cylinder, and an upper die plate sleeved to the upper end of the inner die cylinder; the upper die plate separates the outer die chamber and has an upper positioning groove for inserting the arc-shaped cooling plate; the lower die plate separates the outer die chamber and has a lower positioning groove for inserting the arc-shaped cooling plate; the forming die base comprises a die base plate, a locking column mounted on the die base plate, and a locking assembly mounted on the locking column and used for pressing the forming outer die and the forming inner die tightly on the die base plate.

[0008] By adopting the technical scheme, the dry transformer coil forming die adopts the arc-shaped cooling plate to form the heat dissipation air duct, replaces the common drawing rod forming mode, increases the cross section of the single heat dissipation air duct, and makes the heat dissipation effect of the dry transformer coil after forming more ideal. The arc-shaped cooling plate is positioned by the upper positioning groove of the upper die plate and the lower positioning groove of the lower die plate, the probability of the arc-shaped cooling plate moving is low, the spacing between the adjacent arc-shaped cooling plates is maintained, the arc-shaped cooling plate can be kept in the vertical state, and the arc-shaped cooling plate can be pulled out from the dry transformer coil in the drawing step.

[0009] Optionally, the arc-shaped cooling plate is a metal cooling plate, and the thickness of the arc-shaped cooling plate gradually decreases along the direction close to the lower die plate.

[0010] By adopting the technical scheme, since the arc-shaped cooling plate needs to be drawn multiple times, the arc-shaped cooling plate is arranged as a metal cooling plate, which helps to make the arc-shaped cooling plate have a relatively ideal service life. In addition, since the dry transformer coil needs to be heat treated and dried in the dry transformer coil forming process, the arc-shaped cooling plate can better transfer the heat in the drying room to the dry transformer coil, which helps to make the temperature in the dry transformer coil reach the predetermined drying temperature.

[0011] The thickness of the arc-shaped cooling plate gradually decreases along the direction close to the lower die plate, which helps to pull the arc-shaped cooling plate out of the dry transformer coil during drawing.

[0012] Optionally, the arc-shaped cooling plate has a structural through hole penetrating through both end faces thereof; and the die seat plate is provided with a ventilation opening corresponding to the structural through hole.

[0013] By adopting the technical scheme, the structural through hole is arranged on the arc-shaped cooling plate, the weight of the arc-shaped cooling plate is reduced, the arc-shaped cooling plate is conveniently inserted into the forming inner die when winding the copper coil module, the dry transformer coil forming die is placed above the air outlet of the drying room when the formed dry transformer coil is put into the drying room for drying and heat preservation, the hot air blown in the drying room enters the structural through hole through the ventilation opening, and the arc-shaped cooling plate is used for heat preservation of the dry transformer coil, which helps to improve the heat preservation effect of the dry transformer coil.

[0014] Optionally, the forming outer die includes a side die plate and an outer die shell; the outer die shell is bent and formed from a stainless steel plate and has elasticity; the outer die shell has a mounting side opening for arranging the side die plate and mounting side plates are formed on both sides of the mounting side opening; the forming outer die is further provided with a compression strip attached to the outer side of the mounting side plate and a bolt clamp jaw clamping the two compression strips.

[0015] By adopting the technical scheme, the forming outer mold is in the form of a side mold plate, an outer mold shell, a pressing strip and a bolt clamp jaw, which facilitates demolding of the forming outer mold from the formed dry-type transformer coil. When demolding the forming outer mold, the bolt clamp jaw and the pressing strip are removed first, and then the outer mold shell and the mounting side plate are peeled off from the outside of the dry-type transformer coil. Since the outer mold shell is elastic, the outer mold shell is peeled off easily.

[0016] In the process of pouring, the molten insulating resin material is prone to leak from the gap between the outer mold shell and the side mold plate. Therefore, the outer mold shell is pressed by the combination of the bolt clamp jaw and the pressing strip, so that the outer mold shell and the side mold plate are ideally matched, and the molten insulating resin material is less likely to leak from the gap between the outer mold shell and the side mold plate in the pouring process.

[0017] Optionally, a top surface of the inner mold cylinder is lower than a top of the forming outer mold; a lower end of the inner mold cylinder is provided with a lower mounting groove for sleeving the lower mold plate; a depth of the lower mounting groove is not greater than a thickness of the lower mold plate; and the locking assembly comprises an elastic locking member sleeved on the locking column and a locking nut for pressing the elastic locking member and threadedly mounted on the locking column.

[0018] By adopting the technical scheme, the specific structure of the locking assembly is disclosed. When the locking nut in the locking assembly locks the elastic locking member downward, the center part of the elastic locking member is pressed against the top surface of the inner mold cylinder, and the two ends of the elastic locking member are pressed against the top of the forming outer mold, so that the locking assembly can press the forming outer mold and the forming inner mold on the mold base plate at the same time. The lower mold plate is sleeved on the lower end of the inner mold cylinder, so that the locking assembly can also press the lower mold plate on the mold base plate when the inner mold cylinder is pressed.

[0019] Optionally, the forming outer mold is provided with an overflow hole in communication with the outer mold chamber.

[0020] By adopting the technical scheme, in the pouring step, the molten insulating resin material is injected into the dry-type transformer coil forming mold, and the excess insulating resin can be discharged from the dry-type transformer coil forming mold through the overflow hole. Since the upper mold plate does not contact the insulating resin material, the top surface of the dry-type transformer coil has a relatively ideal forming quality, and the upper mold plate can also be demolded from the dry-type transformer coil forming mold relatively easily.

[0021] In the second aspect, the application provides a dry-type transformer coil forming process, which adopts the following technical scheme:

[0022] The dry variable coil forming process adopts the dry variable coil forming die, and comprises the following steps: installing the upper die plate and the lower die plate on an inner die cylinder, and winding a copper coil module on the inner die cylinder to obtain a first semi-finished product; a group of arc-shaped cooling plates are arranged between adjacent copper coil modules, one end of the arc-shaped cooling plate is inserted into a corresponding upper positioning groove in the upper die plate, and the other end of the arc-shaped cooling plate is inserted into a corresponding lower positioning groove in the lower die plate; the first semi-finished product is placed on a forming die seat, a forming outer die is installed outside the first semi-finished product, and the forming inner die and the forming outer die are pressed on the forming die seat by a locking assembly to form a second semi-finished product; vacuum casting is performed on the second semi-finished product to form a third semi-finished product; the third semi-finished product is heat preserved and dried to form a fourth semi-finished product; the fourth semi-finished product is cooled until the fourth semi-finished product is cooled to 60-70 DEG C, and the forming die seat, the forming outer die and the forming inner die on the fourth semi-finished product are removed, and the arc-shaped cooling plates on the dry variable coil are pulled out.

[0023] By adopting the above technical scheme, the arc-shaped cooling plate is used to form the heat dissipation air duct in the dry variable coil forming process, the cross section of a single heat dissipation air duct is increased, and the heat dissipation effect of the formed dry variable coil is more ideal. The upper positioning groove of the upper die plate and the lower positioning groove of the lower die plate are used to position the arc-shaped cooling plate, so that the probability of the arc-shaped cooling plate moving is low, the spacing between adjacent arc-shaped cooling plates is maintained, and the arc-shaped cooling plate can maintain a vertical state, which is helpful for pulling out the arc-shaped cooling plate from the dry variable coil in the pulling step.

[0024] Optionally, the copper coil module comprises, from inside to outside, a first mesh cloth, a copper coil layer and a second mesh cloth, and the copper wire outside the copper coil layer is wrapped with a non-woven fabric layer.

[0025] By adopting the above technical scheme, the copper wire outside the copper coil layer is provided with a non-woven fabric layer, the insulating resin material can be combined with the non-woven fabric and the mesh cloth, the thickness of the insulating resin on the two sides of the copper coil layer is ensured, and the insulation of the two sides of the copper coil layer is maintained. The mesh cloth layer serves as a skeleton of the insulating resin on the two sides of the copper coil layer, and helps to improve the structural strength of the insulating resin on the two sides of the copper coil layer.

[0026] Optionally, the arc-shaped cooling plate is a metal cooling plate, the arc-shaped cooling plate has a structural through hole penetrating through two end faces thereof, the die seat plate is provided with a ventilation opening corresponding to the structural through hole, and the third semi-finished product is heat preserved and dried in a drying room, and an air outlet of the drying room is arranged at the bottom of the drying room. When the third semi-finished product is placed in the drying room, the ventilation opening of the die seat plate in the third semi-finished product faces the air outlet of the drying room.

[0027] By adopting the technical scheme, the third semi-finished product is placed in the drying room for drying, the air outlet of the drying room blows hot air towards the third semi-finished product, the hot air can pass through the ventilation opening and the structural through hole in sequence, and the formed dry variable coil is heat preserved by the arc-shaped cooling plate, the temperature of the hot air can be transmitted to the center part of the dry variable coil more quickly through the inner wall of the structural through hole of the arc-shaped cooling plate, and the heat preservation effect of the center part of the dry variable coil is more ideal.

[0028] Optionally, the top of the arc-shaped cooling plate is provided with a stripping through hole penetrating the inner and outer sides thereof; a stripping device is adopted to strip the arc-shaped cooling plates on the dry plate coil; the stripping device comprises a stripping seat installed on the ground, a pressing assembly installed on the stripping seat and used for locking the dry variable coil on the stripping seat, a stripping assembly used for connecting the arc-shaped cooling plates and a lifting device used for lifting the stripping assembly; the pressing assembly comprises a stripping column installed on the stripping seat, a stripping pressing plate slidingly installed on the stripping column and a stripping nut threadedly matched with the stripping column; the stripping assembly comprises a stripping plate, stripping insertion columns threadedly installed on the stripping plate and corresponding to the arc-shaped cooling plates, and the stripping insertion columns can be inserted into the stripping through holes.

[0029] By adopting the technical scheme, the steps of stripping the arc-shaped cooling plates from the formed dry variable coil are as follows: firstly, the formed dry variable coil is placed on the stripping seat, and the dry variable coil is locked on the stripping seat by using the pressing assembly; then, the stripping assembly is installed on the arc-shaped cooling plates on the dry variable coil, so that the stripping insertion columns on the stripping plate are inserted into the stripping through holes of the arc-shaped cooling plates; and then, the stripping assembly is integrally lifted by using the lifting device, so that all the arc-shaped cooling plates can be stripped from the dry variable coil at one time, and the efficiency of stripping the arc-shaped cooling plates is relatively ideal.

[0030] In summary, the present application has at least one of the following beneficial technical effects:

[0031] 1. The dry variable coil forming die forms a heat dissipation air duct through an arc-shaped cooling plate, so that the cross section of the heat dissipation air duct can be improved, which helps to improve the heat dissipation effect of the dry variable coil, and the arc-shaped cooling plate is positioned by the upper die plate and the lower die plate, so that the arc-shaped cooling plate can maintain a vertical state, which helps to strip the arc-shaped cooling plate from the dry variable coil in the stripping step;

[0032] 2. The arc-shaped cooling plate is a metal cooling plate and has a structural through hole, and a ventilation opening is arranged on the die seat plate, so that when the formed dry variable coil is dried and heat preserved in the drying room, the hot air in the drying room can pass through the ventilation opening and the structural through hole in sequence, and the temperature of the hot air can be transmitted to the center part of the dry variable coil more quickly through the inner wall of the structural through hole of the arc-shaped cooling plate, so that the heat preservation effect of the center part of the dry variable coil is more ideal;

[0033] 3. The outer forming mold is in the form of an outer mold shell and a side mold plate, so that the outer mold shell is more convenient to demold from the dry variable coil after forming;

[0034] 4. A dry variable coil forming process adopts the dry variable coil forming mold, and adopts the arc-shaped cooling plate to form the heat dissipation air duct, increases the cross section of the heat dissipation air duct, so that the heat dissipation effect of the dry variable coil after forming is more ideal. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a structure schematic diagram of the dry variable coil forming mold in the embodiment of the present application.

[0036] Figure 2 is a structure schematic diagram of the forming mold base in the embodiment of the present application.

[0037] Figure 3 is a structure schematic diagram of the forming inner mold in the embodiment of the present application.

[0038] Figure 4 is a cross-sectional schematic diagram of the forming inner mold in the embodiment of the present application.

[0039] Figure 5 is a structure schematic diagram of the arc-shaped cooling plate in the embodiment of the present application.

[0040] Figure 6 is a cross-sectional schematic diagram of the forming mold base, the forming inner mold and the arc-shaped cooling plate in the cooperating state in the embodiment of the present application.

[0041] Figure 7 is a structure schematic diagram of the outer forming mold in the embodiment of the present application.

[0042] Figure 8 is a structure schematic diagram of the demolding device in the embodiment of the present application.

[0043] Figure 9 is a cooperation schematic diagram of the demolding column, the demolding pressing plate and the demolding nut in the embodiment of the present application.

[0044] Figure 10 is a cooperation schematic diagram of the demolding assembly in the embodiment of the present application.

[0045] Figure 11 is a structure schematic diagram of the copper coil mold group in the embodiment of the present application.

[0046] Figure 12 is a structure schematic diagram of the copper wire and the non-woven fabric layer in the copper coil layer in the embodiment of the present application.

[0047] Explanation of reference signs: 1, forming die seat; 11, die seat plate; 111, sealing silica gel layer; 112, ventilation opening; 12, locking column; 121, limiting section; 122, locking section; 13, elastic locking piece; 131, square through hole; 14, locking nut; 2, forming outer die; 21, outer die chamber; 22, side die plate; 221, mounting through hole; 23, outer die shell; 231, mounting side opening; 232, mounting side plate; 233, overflow hole; 241, first compression strip; 2411, locking groove; 242, second compression strip; 25, bolt clamping jaw; 251, clamping jaw frame; 2511, first clamping jaw part; 2512, second clamping jaw part; 2513, connecting piece; 2514, locking threaded hole; 252, locking bolt; 3, forming inner die; 31, inner die cylinder; 311, partition plate; 312, first square hole; 313, lower mounting groove; 314, upper mounting groove; 32, lower die plate; 321, lower positioning groove; 33, upper die plate; 331, upper positioning groove; 332, pouring through hole; 4, arc-shaped cooling plate; 41, ejection through hole; 42, structural through hole; 5, ejection device; 51, ejection seat; 511, T-shaped sliding groove; 52, ejection column; 521, T-shaped sliding block; 53, ejection pressing plate; 54, ejection nut; 55, ejection plate; 551, threaded upright plate; 552, ejection lifting ring; 56, ejection inserting column; 561, inserting part; 562, threaded part; 563, rotating head; 61, first mesh cloth layer; 62, copper coil layer; 621, copper wire; 63, second mesh cloth layer; 64, non-woven fabric layer. DETAILED DESCRIPTION

[0048] The following will be described in detail below with reference to the accompanying drawings. Figures 1-12 The present application is further described in detail.

[0049] The embodiments of the present application disclose a dry-type transformer coil forming die and a dry-type transformer coil forming process.

[0050] Reference will be made to Figure 1 A dry-type transformer coil forming die for forming a dry-type transformer coil, comprising a forming die seat 1, a forming outer die 2, a forming inner die 3, and an arc-shaped cooling plate 4 for forming a heat dissipation air duct.

[0051] Reference will be made to Figure 1 and Figure 2 The forming die seat 1 comprises a die seat plate 11, a locking column 12 mounted on the die seat plate 11, and a locking assembly mounted on the locking column 12 and used for compressing the forming outer die 2 and the forming inner die 3 on the die seat plate 11.

[0052] Reference will be made to Figure 2, the mold base plate 11 is a square metal plate, and the locking column 12 is also a metal column, and the locking column 12 is vertically welded on the top surface of the mold base plate 11. The top surface of the mold base plate 11 is paved with a layer of sealing silica gel layer 111. The locking column 12 includes a limiting section 121 and a locking section 122 in sequence in the direction away from the mold base plate. The limiting section 121 is square in cross section, and the locking section 122 is circular in cross section and is provided with external threads on the outer surface.

[0053] With reference to Figure 1 and Figure 2 , the locking assembly includes an elastic locking piece 13 and a locking nut 14 for pressing the elastic locking piece 13. The elastic locking piece 13 is a metal plate with elasticity. The middle part of the elastic locking piece 13 is provided with a square through hole 131 matched with the limiting section 121, so that the elastic locking piece 13 can slide along the length direction of the limiting section 121. The locking nut 14 is threadedly matched with the locking section 122 of the locking column 12.

[0054] With reference to Figure 2 and Figure 3 , the forming inner mold 3 includes an inner mold cylinder 31, a lower mold plate 32 sleeved on the lower end of the inner mold cylinder 31, and an upper mold plate 33 sleeved on the upper end of the inner mold cylinder 31. The inner mold cylinder 31 is oval in cross section, and is provided with a partition plate 311 at each end, for covering the openings of the two ends of the inner cavity. The center of each partition plate 311 is provided with a first square hole 312. The cross-sectional shape of the first square hole 312 is matched with the cross-sectional shape of the limiting section 121 of the locking column 12, so that the forming inner mold 3 can be positioned on the mold base plate 11 through the matching of the first square hole 312 and the limiting section 121. In addition, the first square hole 312 can also be matched with the driving shaft of the winding machine, so that the winding machine can drive the forming inner mold 3 to rotate.

[0055] With reference to Figure 3 and Figure 4 , the lower end of the inner mold cylinder 31 has a lower mounting groove 313 for sleeving the lower mold plate 32. The depth of the lower mounting groove 313 is not greater than the thickness of the lower mold plate 32, so that the inner mold cylinder 31 can press the lower mold plate 32 tightly on the top surface of the mold base plate 11. The upper end of the inner mold cylinder 31 has an upper mounting groove 314 for sleeving the upper mold plate 33, so that the upper mold plate 33 can be limited on the inner mold cylinder 31.

[0056] With reference to Figure 3 , in order to facilitate the pouring of the dry variable coil forming mold in the vacuum pouring pot, the upper mold plate 33 is provided with a pouring through hole 332, so that in the pouring step, the pouring pipe of the vacuum pouring device can be inserted into the pouring through hole 332 to pour the dry variable coil forming mold.

[0057] With reference to Figure 1The number of the arc-shaped cooling plates 4 in the dry-type transformer coil forming mold is determined according to the number of the copper coil module in the dry-type transformer coil. Since the arc-shaped cooling plates 4 are arranged between two adjacent copper coil modules, the number of the arc-shaped cooling plates 4 is one less than the number of the copper coil modules. In the embodiment, the dry-type transformer coil has two layers of copper coil modules, that is, the dry-type transformer coil has one circle of heat dissipation air ducts, and therefore the dry-type transformer coil forming mold has one set of arc-shaped cooling plates 4. In the embodiment, the dry-type transformer coil forming mold has eight arc-shaped cooling plates 4.

[0058] With reference to Figure 1 and Figure 3 , the arc-shaped cooling plates 4 are metal cooling plates. The lower die plate 32 is provided with lower positioning grooves 321 corresponding to the arc-shaped cooling plates 4 and for inserting the arc-shaped cooling plates 4. The lower positioning grooves 321 pass through the upper and lower surfaces of the lower die plate 32, and the cross-sectional shape of the lower positioning grooves 321 is consistent with the cross-sectional shape of the arc-shaped cooling plates 4. The upper die plate 33 is provided with upper positioning grooves 331 corresponding to the arc-shaped cooling plates 4 and for inserting the arc-shaped cooling plates 4. The upper positioning grooves 331 pass through the upper and lower surfaces of the upper die plate 33, and the cross-sectional shape of the upper positioning grooves 331 is consistent with the cross-sectional shape of the arc-shaped cooling plates 4. When the arc-shaped cooling plates 4 are installed between the upper die plate 33 and the lower die plate 32, the height direction of the arc-shaped cooling plates 4 is parallel to the height direction of the inner mold cylinder 31.

[0059] With reference to Figure 1 and Figure 3 , in order to facilitate the demolding of the arc-shaped cooling plates 4 from the formed dry-type transformer coil, the thickness of the arc-shaped cooling plates 4 gradually decreases in the direction close to the lower die plate 32. The thickness of the arc-shaped cooling plates 4 refers to the radial distance between the inner arc and the outer arc in the cross section of the metal cooling plate. In addition, the top of the arc-shaped cooling plate 4 is provided with a demolding through hole 41 passing through the inner and outer surfaces thereof.

[0060] With reference to Figure 5 and Figure 6 , the arc-shaped cooling plate 4 also has a structure through hole 42 passing through the end surfaces thereof. The cross-sectional shape of the structure through hole 42 is similar to the cross-sectional shape of the arc-shaped cooling plate 4. The mold base plate 11 is provided with air vents 112 corresponding to the structure through holes 42. When the forming inner mold 3 and the arc-shaped cooling plates 4 are installed to the forming mold base 1, the air vents 112 and the corresponding structure through holes 42 combine to form a channel, so that air can flow from bottom to top through the air vents 112 and the structure through holes 42.

[0061] With reference to Figure 1 , Figure 3 and Figure 7The outer forming mold 2 is arranged outside the inner forming mold 3 and has an outer mold cavity 21 penetrating the upper and lower end faces. When the outer forming mold 2 is arranged outside the inner forming mold 3, the upper mold plate 33 and the lower mold plate 32 of the inner forming mold 3 both block the outer mold cavity 21 of the outer forming mold 2.

[0062] With reference to Figure 7 The outer forming mold 2 comprises a side mold plate 22, an outer mold shell 23 and a clamping assembly for assembling the side mold plate 22 and the outer mold shell 23. The side mold plate 22 is a vertically arranged metal plate, and eight installation through holes 221 penetrating the inner and outer surfaces of the side mold plate 22 are arranged on the side mold plate 22 for inserting and installing the metal posts of the dry variable coil. The eight installation through holes 221 are arranged in two rows.

[0063] With reference to Figure 7 The outer mold shell 23 is formed by bending a stainless steel plate and has elasticity. The outer mold shell 23 has an installation side opening 231 for arranging the side mold plate 22, and installation side plates 232 are formed on both sides of the installation side opening 231.

[0064] With reference to Figure 7 The clamping assembly comprises a pressing strip corresponding to each installation side plate 232 and abutting the outer side face of the installation side plate 232, and a bolt clamping jaw 25 clamping the two pressing strips. The length of the pressing strip is consistent with the length of the installation side plate 232. The two pressing strips are respectively a first pressing strip 241 and a second pressing strip 242.

[0065] With reference to Figure 7 The bolt clamping jaw 25 comprises a clamping jaw frame 251 and a locking bolt 252. The clamping jaw frame 251 is a C-shaped frame, comprising a first clamping jaw part 2511 opposite to the first pressing strip 241, a second clamping jaw part 2512 abutting the second pressing strip 242, and a connecting piece 2513 connecting the first clamping jaw part 2511 and the second clamping jaw part 2512. The first clamping jaw part 2511 has a locking threaded hole 2514 penetrating the inner and outer side walls, and the locking bolt 252 is threadedly installed on the locking threaded hole 2514 from the outside to the inside. The first pressing strip 241 is arranged with a plurality of locking grooves 2411 on the side face facing the first clamping jaw part 2511 in the height direction for inserting the bolt rod of the locking bolt 252. In this embodiment, the number of bolt clamping jaws 25 in the clamping assembly is two, which are clamped on the upper end part and the lower end part of the pressing strip respectively. The number of bolt clamping jaws 25 can be increased with the increase of the length of the pressing strip.

[0066] With reference to Figure 1When the forming outer mold 2 and the forming inner mold 3 are both installed on the mold base plate, the height of the outer mold shell 23 is higher than the height of the inner mold cylinder 31, so that when the locking assembly tightly presses the forming outer mold 2 and the forming inner mold 3 on the forming mold base 1, the middle part of the elastic locking piece 13 is tightly pressed on the top of the inner mold cylinder 31, and the two ends of the elastic locking piece 13 are bent and deformed upwards and tightly lock the outer mold shell 23.

[0067] With reference to Figure 7 , the outer mold shell 23 is provided with an overflow hole 233 communicating with the outer mold cavity 21 on the side away from the side mold plate 22, so that during the pouring step, the excess insulation resin material can be discharged through the overflow hole 233 of the dry-type transformer coil forming mold, which helps to improve the forming quality of the top surface of the dry-type transformer coil after forming.

[0068] With reference to Figure 8 , the application also discloses a drawing device 5 which can be matched with the dry-type transformer coil forming mold and used for drawing the arc-shaped cooling plate 4 of the dry-type transformer coil after forming. The drawing device 5 comprises a drawing base 51, a pressing assembly installed on the drawing base 51 and used for locking the dry-type transformer coil on the drawing base 51, a drawing assembly used for connecting the arc-shaped cooling plate 4 and a lifting device used for lifting the drawing assembly.

[0069] With reference to Figure 8 , the drawing base 51 is a metal base which is installed on the ground through foundation bolts. The drawing base 51 is provided with a plurality of T-shaped sliding grooves 511 which are parallel to each other and are arranged at intervals on the top surface. The T-shaped sliding grooves 511 penetrate through the side surface of the drawing base 51 and form sliding openings on the side surface of the drawing base 51.

[0070] With reference to Figure 8 and Figure 9 , the pressing assembly comprises four drawing columns 52, a drawing pressing plate 53 which is slidingly installed on the drawing columns 52 and a drawing nut 54 which is screwed with the drawing columns 52. The bottom of the drawing column 52 is provided with a T-shaped sliding block 521 which is matched with the T-shaped sliding groove 511, so that the drawing column 52 can slide along the T-shaped sliding groove 511. When the dry-type transformer coil is placed on the top surface of the drawing base 51, the drawing column 52 can be slid so as to be arranged outside the dry-type transformer coil, and then the drawing nut 54 is screwed to tightly press the dry-type transformer coil on the drawing base 51, and since the distance between the drawing nut 54 and the T-shaped sliding block 521 is reduced, the T-shaped sliding block 521 is also locked in the T-shaped sliding groove 511.

[0071] With reference to Figure 8 and Figure 10The demolding assembly includes a demolding plate 55 and demolding posts 56 which are screwed to the demolding plate 55. The demolding assembly has eight demolding posts 56 corresponding to the arc-shaped cooling plates 4 in the dry-type coil forming die. The top of the demolding plate 55 is welded with a threaded vertical plate 551 which is screwed with the demolding posts 56. The demolding post 56 includes a plug-in part 561 for inserting the demolding through hole 41, a threaded part 562 for cooperating with the threaded vertical plate 551, and a rotating head 563 for rotating drive. The top center of the demolding plate 55 is provided with a demolding lifting ring 552 for cooperating with the lifting device.

[0072] The lifting device of the demolding device 5 is a travelling crane. The travelling crane is provided with a demolding lifting hook which is matched with the demolding lifting ring 552. When the demolding assembly needs to be lifted, the demolding lifting hook in the travelling crane is installed on the demolding lifting ring 552, and the lifting cable of the travelling crane is kept in a vertical state, so that the travelling crane can be started to lift the demolding assembly.

[0073] In combination Figures 1 to 11 The application also discloses a dry-type coil forming process which adopts the dry-type coil forming die and includes the following steps.

[0074] S1, the upper die plate 33 and the lower die plate 32 are installed on the inner die cylinder 31 to assemble the forming inner die 3, and the forming inner die 3 is installed on the dry-type coil winding machine.

[0075] S2, the copper coil module is wound on the inner die cylinder 31, and a set of arc-shaped cooling plates 4 is arranged between adjacent copper coil modules. In the embodiment, the dry-type coil has two layers of copper coil modules, and a set of arc-shaped cooling plates 4 is arranged between the two layers of copper coil modules. One end of the arc-shaped cooling plate 4 is plugged into the corresponding upper positioning groove 331 in the upper die plate 33, and the other end of the arc-shaped cooling plate 4 is plugged into the corresponding lower positioning groove 321 in the lower die plate 32.

[0076] The copper coil module includes a first mesh cloth 61, a copper coil layer 62 and a second mesh cloth 63 from inside to outside, and the outer side of the copper wire 621 in the copper coil layer 62 is wrapped with a non-woven fabric layer 64. The copper coil layer 62 includes three layers of copper wires 621, and the copper wire 621 is a flat copper wire.

[0077] After the above steps, a first semi-finished product is obtained, which includes the forming inner die 3, a set of arc-shaped cooling plates 4 and two layers of copper coil modules.

[0078] S3, the first half product is arranged on the mold base plate 11 of the forming mold base 1 by locking the cooperation of the locking column 12 and the first square hole 312 of the forming inner mold 3. Metal connecting posts are installed at the joints of the copper coil module, and the metal connecting posts are inserted into the installation through hole 221 of the side mold plate 22. The forming outer mold 2 is installed outside the first half product, and the outer mold shell 23 and the side mold plate 22 are assembled by the clamping assembly, at this time the upper mold plate 33 and the lower mold plate 32 are supported on the inner side of the forming outer mold 2 and the outer mold cavity 21 of the forming outer mold 2 is blocked. The elastic locking piece 13 and the locking nut 14 are installed on the locking column 12, and the locking nut 14 is tightened, so that the elastic locking piece 13 locks the forming inner mold 3 and the forming outer mold 2 on the mold base plate 11. At this time, the second half product is formed, which includes the forming mold base 1, the forming inner mold 3, the forming outer mold 2, a set of arc-shaped cooling plates 4 and two layers of copper coil modules.

[0079] S4, the second half product is arranged in the vacuum pouring pot, and the pouring pipe of the vacuum pouring pot is inserted into the pouring through hole 332 of the upper mold plate 33, but the lower end of the pouring pipe is higher than the overflow hole 233 of the outer mold shell 23. The second half product is vacuum poured by using the vacuum pouring pot, and after pouring is completed, the third half product is obtained. The third half product includes the forming mold base 1, the forming inner mold 3, the forming outer mold 2, a set of arc-shaped cooling plates 4 and a formed dry variable coil.

[0080] S5, the third half product is placed in the drying oven for heat preservation and drying to form the fourth half product. The drying oven used in this step is an oven with air outlet at the inner bottom surface, and a steel pipe support is arranged in the drying oven. When the third half product is heat preserved and dried, the third half product is placed on the steel pipe support, so that the ventilation opening 112 of the mold base plate 11 in the third half product faces the air outlet of the drying oven, so that the hot air blown out by the drying oven can pass through the ventilation opening 112 and the structural through hole 42, and the temperature of the hot air can be transmitted to the center part of the dry variable coil through the inner wall at the structural through hole 42 of the arc-shaped cooling plate 4. The temperature of the drying oven is maintained at 120-140℃, and after the third half product is heat preserved and dried, the fourth half product is formed.

[0081] S6, when the surface temperature of the fourth semi-finished product cools to 60-70°C, the forming outer mold 2, the forming inner mold 3 and the forming mold base 1 on the fourth semi-finished product are removed, and the arc-shaped cooling plate 4 on the formed dry variable coil is removed by the drawing device 5. The dry variable coil with the arc-shaped cooling plate 4 is placed on the drawing seat 51 of the drawing device 5, and four drawing columns 52 are arranged around the dry variable coil, and the dry variable coil is pressed on the drawing seat 51 by the pressing assembly. Then, the drawing assembly is installed on the arc-shaped cooling plate 4 on the dry variable coil, so that the drawing pins 56 on the drawing assembly are respectively inserted into the drawing through holes 41 of the corresponding arc-shaped cooling plate 4. Then, the travelling crane is moved, so that the drawing hooks on the travelling crane are installed on the drawing lifting ring 552 of the drawing plate 55, and the lifting cable of the travelling crane is kept in a vertical state, the travelling crane is started to lift the drawing assembly, and eight arc-shaped cooling plates 4 on the dry variable coil can be drawn out synchronously.

[0082] The dry variable coil forming process of the embodiment of the present application uses the above-mentioned dry variable coil forming mold, uses the arc-shaped cooling plate 4 to form the heat dissipation air duct, compared with the same drawing rod forming mode, in the case that the overall cross-sectional area of the heat dissipation air duct does not change, the cross-sectional area of a single heat dissipation air duct is increased, so that the heat dissipation effect of the dry variable coil formed by using the process is more ideal. Moreover, the upper mold plate 33 and the lower mold plate 32 of the forming inner mold 3 can position the arc-shaped cooling plate 4, the probability of the arc-shaped cooling plate 4 jumping is reduced, and the spacing between adjacent arc-shaped cooling plates 4 is maintained, so that the arc-shaped cooling plate 4 can maintain a vertical state, which is helpful to draw the arc-shaped cooling plate 4 out of the dry variable coil in the drawing step.

[0083] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the basis of the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A dry-type transformer coil forming mold, characterized in that, The system includes a molding mold base (1), an outer molding mold (2), an inner molding mold (3), and an arc-shaped cooling plate (4) for forming heat dissipation channels; the outer molding mold (2) has an outer mold cavity (21) that extends through the upper and lower end faces; the inner molding mold (3) includes an inner mold cylinder (31), a lower template (32) fitted at the lower end of the inner mold cylinder (31), and an upper template (33) fitted at the upper end of the inner mold cylinder (31); the upper template (33) separates the outer mold cavity (21) and has a function for supplying heat dissipation channels. The upper positioning groove (331) into which the arc-shaped cooling plate (4) is inserted; the lower template (32) divides the outer mold cavity (21) and has a lower positioning groove (321) for the arc-shaped cooling plate (4) to be inserted; the forming mold base (1) includes a mold base plate (11), a locking column (12) mounted on the mold base plate (11), and a locking assembly mounted on the locking column (12) for pressing the outer forming mold (2) and the inner forming mold (3) against the mold base plate (11); The forming outer mold (2) includes a side template (22) and an outer mold shell (23); the outer mold shell (23) is formed by bending stainless steel plate and is elastic; the outer mold shell (23) has an installation side opening (231) for arranging the side template (22) and installation side plates (232) are formed on both sides of the installation side opening (231); the forming outer mold (2) is also provided with a clamping strip that fits against the outside of the installation side plate (232) and a bolt clamp (25) for clamping the two clamping strips; The height of the top surface of the inner mold cylinder (31) is lower than the height of the top surface of the outer mold (2); the lower end of the inner mold cylinder (31) has a lower mounting groove (313) for the lower template (32) to be fitted; the depth of the lower mounting groove (313) is not greater than the thickness of the lower template (32); the locking assembly includes an elastic locking member (13) sleeved on the locking post (12) and a locking nut (14) for pressing the elastic locking member (13) and threaded onto the locking post (12).

2. The dry-type transformer coil forming mold according to claim 1, characterized in that, The arc-shaped cooling plate (4) is a metal cooling plate, and the thickness of the arc-shaped cooling plate (4) gradually decreases along the direction close to the lower template (32).

3. The dry-type transformer coil forming mold according to claim 2, characterized in that, The arc-shaped cooling plate (4) has structural through holes (42) penetrating both ends of it; the mold base plate (11) has ventilation openings (112) that correspond one-to-one with the structural through holes (42).

4. The dry-type transformer coil forming mold according to claim 1, characterized in that, The outer mold (2) is provided with an overflow hole (233) that communicates with the outer mold cavity (21).

5. A dry-type transformer coil forming process, characterized in that, The dry-type transformer coil forming mold as described in claim 1 includes: installing the upper template (33) and the lower template (32) onto the inner mold cylinder (31), and winding a copper coil module on the inner mold cylinder (31) to obtain a first semi-finished product, wherein a set of arc-shaped cooling plates (4) are arranged between adjacent copper coil modules, one end of the arc-shaped cooling plate (4) is inserted into the corresponding upper positioning groove (331) in the upper template (33), and the other end of the arc-shaped cooling plate (4) is inserted into the corresponding lower positioning groove (321) in the lower template (32); The first semi-finished product is placed on the molding mold base (1), and the molding outer mold (2) is installed on the outside of the first semi-finished product. The molding inner mold (3) and the molding outer mold (2) are pressed onto the molding mold base (1) by the locking component to form the second semi-finished product. The second semi-finished product is vacuum-cast to form the third semi-finished product; the third semi-finished product is then kept warm and dried to form the fourth semi-finished product. Cool the fourth semi-finished product until it reaches 60°C to 70°C. Remove the molding mold base (1), outer molding mold (2), and inner molding mold (3) from the fourth semi-finished product and pull out the arc-shaped cooling plate (4) on the dry transformer coil.

6. The dry-type transformer coil forming process according to claim 5, characterized in that: The copper coil module comprises, from the inside out, a first mesh cloth (61), a copper coil layer (62), and a second mesh cloth (63). The copper wires (621) in the copper coil layer (62) are wrapped with a non-woven fabric layer (64).

7. The dry-type transformer coil forming process according to claim 5, characterized in that, The arc-shaped cooling plate (4) is a metal cooling plate, and the arc-shaped cooling plate (4) has structural through holes (42) penetrating both ends of it; the mold base plate (11) has ventilation openings (112) corresponding to the structural through holes (42); the third semi-finished product is kept warm and dried in the drying room, and the air outlet of the drying room is arranged at the bottom of the drying room; when the third semi-finished product is placed in the drying room, the ventilation openings (112) of the mold base plate (11) in the third semi-finished product face the air outlet of the drying room.

8. The dry-type transformer coil forming process according to claim 5, characterized in that: The top of the arc-shaped cooling plate (4) is provided with a draft hole (41) penetrating its inner and outer sides; the arc-shaped cooling plate (4) on the dry transformer coil is pulled out using a drafting device (5); the drafting device (5) includes a drafting base (51) installed on the ground, a clamping assembly installed on the drafting base (51) and used to lock the dry transformer coil on the drafting base (51), a drafting assembly for connecting the arc-shaped cooling plate (4), and a lifting device for lifting the drafting assembly; The clamping assembly includes a drafting column (52) mounted on the drafting base (51), a drafting pressure plate (53) slidably mounted on the drafting column (52), and a drafting nut (54) threadedly engaged with the drafting column (52); the drafting assembly includes a drafting plate (55), a drafting insert (56) threadedly mounted on the drafting plate (55) and corresponding one-to-one with the arc-shaped cooling plate (4), and the drafting insert (56) can be inserted into the drafting through hole (41).

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