Winding fixing structure and voltage transformer thereof

Abstract

The invention relates to the technical field of voltage transformers, and discloses a winding fixing structure which comprises a transformer body and further comprises an iron core fixedly installed in an inner cavity of the transformer body, the iron core further comprises an outer-layer piece, a middle piece and a connecting piece, protruding plates are integrally formed on the inner side of the outer-layer piece and the upper portion and the lower portion of the two sides of the connecting piece respectively, and the outer-layer piece and the middle piece are integrally formed. Slots are respectively formed in the upper and lower parts of two side surfaces of the middle sheet; the T-shaped protruding plates are integrally formed on the inner side of the outer layer piece and the two sides of the connecting piece in the iron core through stamping, so that the outer layer piece and the connecting piece can be mutually inserted and fixed through the protruding plates and the inserting grooves formed in the side faces of the corresponding middle pieces, and therefore multiple sets of thin pieces in the iron core are bonded through mucilage glue; the plurality of groups of sheets can be mutually engaged and assembled to form a whole, so that the plurality of groups of sheets in the iron core can still be mutually engaged together after cavities appear in the later stage of gluing, and dislocation is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage transformers, in particular to a winding fixing structure and a voltage transformer thereof. Background Art

[0002] A voltage transformer is a device for measuring voltage and electric energy in a power system or electrical control system. It is mainly used to power measuring instruments and relay protection devices, to measure the voltage, power and electric energy of the line, or to protect valuable equipment, motors and transformers in the line when a line fault occurs.

[0003] For example, the Chinese patent authorization announcement number CN222867402U discloses a small-volume voltage transformer, comprising a voltage transformer body, a base fixedly mounted on the lower surface of the voltage transformer body, an iron core fixedly mounted on the inner surface of the voltage transformer, and a primary winding shield provided on the outer surface of the iron core.

[0004] In the above-mentioned cited documents, through the coordination between the voltage transformer body, base, iron core, primary winding shield, primary winding assembly, primary terminal, secondary winding assembly, high-voltage conductor, epoxy cast insulation, anti-fouling umbrella skirt, first blocker, second blocker, explosion-proof casing, explosion-proof terminal and other structures, the primary terminal and high-voltage conductor on the voltage transformer can be effectively insulated and protected. At the same time, they can also be detected in real time. When the current exceeds the specified value, the two circuits can be disconnected by the blocker to avoid the circuit from burning and being damaged, thereby affecting the internal components of the voltage transformer.

[0005] However, the iron core in the existing voltage transformer is fixed by gluing multiple sets of thin sheets together. Due to problems such as undried glue and uneven glue application at the bonding site, voids appear immediately after the glued iron core sheets are glued together. The glued area is baked for a long time, resulting in increasingly larger gaps at the back and weak bonding sites, resulting in dislocation. Summary of the Invention

[0006] The purpose of the present invention is to provide a winding fixing structure and a voltage transformer thereof, which can achieve close connection between the iron core sheets, and can fill the glue-coated voids according to subsequent temperature changes, so that the connection integrity of multiple groups of iron core sheets is better.

[0007] To achieve the above object, the present invention provides the following technical solution: a winding fixing structure, comprising a transformer body, and further comprising:

[0008] An iron core is fixedly installed in the inner cavity of the transformer body, and the iron core also includes an outer layer sheet, an intermediate sheet, and a connecting sheet. The inner side of the outer layer sheet and the upper and lower parts of both sides of the connecting sheet are respectively integrally formed with convex plates. The upper and lower parts of both sides of the intermediate sheet are respectively provided with slots. The convex plates on the inner side of the outer layer sheet are plugged and fixed with the slots on the side surfaces of the intermediate sheet.

[0009] Sealing tubes are arranged at equal intervals in the middle of the top surface of the core, with overflow pipes passing through both ends of the sealing tubes, a push plate is slidably connected inside the sealing tube, and a connecting protrusion is fixedly installed on one side of the push plate;

[0010] The telescopic capsule balls are arranged at equal intervals in the middle of the top surface of the iron core, and one end of the connecting protrusion is fixedly connected to the movable end of the telescopic capsule balls;

[0011] Guide grooves are respectively provided at the joints between the outer layer sheet and the middle sheet, and at the top and side edges of the joints between the middle sheet and the connecting sheet.

[0012] Preferably, the inner cross-sections of the convex plate and the slot are both T-shaped structures, and the adjacent surfaces of the middle piece and the connecting piece, as well as the adjacent surfaces of the outer layer piece and the middle piece, are in contact with each other.

[0013] Preferably, the convex plates on both sides of the connecting piece are respectively plugged and fixed with the slots on the side of the middle piece, and the convex plates on the inner side of the outer layer piece are respectively plugged and fixed with the corresponding slots on the side of the middle piece.

[0014] Preferably, mounting grooves are provided at equal intervals on the tops of the joints between the outer sheet and the middle sheet, and between the middle sheet and the connecting sheet, and the sealing tubes are fixedly installed in the inner walls of the corresponding mounting grooves.

[0015] Preferably, one end of the telescopic ball is fixedly mounted on one end inside the mounting groove, and the end of the sealing tube close to the telescopic ball slides in the corresponding inner wall of the mounting groove.

[0016] Preferably, through holes are respectively opened inside the guide groove near the slot and the convex plate, and the guide groove at the top of the iron core and the guide groove at the side are respectively connected through the through holes.

[0017] Preferably, the push plates extend into the corresponding guide grooves respectively, and overflow holes are respectively opened on both sides of the push plates.

[0018] Preferably, a base is fixedly installed at the bottom of the transformer body, a positioning groove is opened at the bottom of the inner wall of the transformer body, an insulating shell is nested outside the iron core, and the iron core is fixedly installed inside the positioning groove through the insulating shell.

[0019] Preferably, a primary winding and a secondary winding are respectively connected to the outside of the insulating shell, a winding shield is fixedly installed at one end of the outside of the insulating shell, a high-voltage wire is installed outside the secondary winding, and a connection terminal is installed outside the primary winding.

[0020] Preferably, epoxy cast insulation is fixedly installed on both sides of the outside of the transformer body, two groups of anti-fouling umbrella skirts are fixedly installed on the outside of the epoxy cast insulation, blockers are fixedly installed on the outside of the high-voltage wires and the wiring terminals, and the two groups of blockers are respectively fixedly installed in the corresponding inner walls of the epoxy cast insulation, and the wiring terminals and the high-voltage wires extend to the top of the epoxy cast insulation respectively.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention forms a T-shaped convex plate on the inner side of the outer layer sheet and on both sides of the connecting sheet in the iron core by stamping, so that the outer layer sheet and the connecting sheet can be plugged and fixed to each other through the convex plate and the slots provided on the side of the corresponding middle sheet. In this way, multiple groups of thin sheets in the iron core can be bonded together by adhesive and assembled to form a whole. In this way, even if there are holes in the adhesive between the multiple groups of thin sheets in the iron core in the later stage, they can still be bonded together to avoid dislocation.

[0023] In the present invention, after the outer layer, the middle layer and the connecting piece are assembled by bonding and then nested and assembled through the insulating shell, liquid glue is injected into the top of the connection through the sealing tube before assembly. Then, when the telescopic balloon is exposed to a high temperature, the push plate is pushed by the telescopic end, so that the glue in the sealing tube overflows outward through the overflow hole on the overflow pipe, and the through holes at both ends of the guide groove connect the top connection of the thin sheet in the iron core with the connection on both sides. In this way, the glue can be guided to the connection cavity of the thin sheet in the iron core and fill it, so that the connection integrity between multiple groups of outer layer sheets, the middle sheet and the connecting piece is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0025] Figure 2 Schematic diagram of the side cross-section structure of the transformer body in the present invention;

[0026] Figure 3 Schematic diagram of the internal structure of the insulating shell in the present invention;

[0027] Figure 4 This is a schematic diagram of the core split structure in the present invention;

[0028] Figure 5 This is a schematic diagram of the split structure of the outer layer sheet and the connecting sheet in the present invention;

[0029] Figure 6 It is a schematic diagram of the local structure of the iron core in the present invention;

[0030] Figure 7 For the present invention Figure 5 A schematic diagram of the partially enlarged structure at center A;

[0031] Figure 8 For the present invention Figure 6 Schematic diagram of the locally enlarged structure at point B in the middle.

[0032] In the figure: 100, transformer body; 200, iron core; 300, sealing tube; 400, telescopic balloon; 500, guide groove; 11, base; 12, insulation shell; 13, winding shield; 14, primary winding; 15, terminal; 16, secondary winding; 17, epoxy casting insulation; 18, anti-fouling umbrella skirt; 19, blocker; 120, positioning groove; 160, high-voltage wire; 20, installation groove; 21, outer sheet; 22, middle sheet; 23, connecting sheet; 221, slot; 231, convex plate; 31, push plate; 32, connecting protrusion; 33, overflow pipe; 331, overflow hole; 51, through hole. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] Example 1:

[0035] This embodiment introduces a winding fixed structure and a voltage transformer thereof, such as Figures 1-8 As shown, it includes a transformer body 100 and further includes:

[0036] The iron core 200 is fixedly installed in the inner cavity of the transformer body 100. The iron core 200 also includes an outer sheet 21, an intermediate sheet 22, and a connecting sheet 23. The inner side of the outer sheet 21 and the upper and lower portions of the connecting sheet 23 are integrally formed with protruding plates 231. The upper and lower portions of the two sides of the intermediate sheet 22 are respectively provided with slots 221. The protruding plates 231 on the inner side of the outer sheet 21 are fixedly plugged into the slots 221 on the side of the intermediate sheet 22.

[0037] The sealing tube 300 is evenly spaced and arranged in the middle of the top surface of the iron core 200. The two ends of the sealing tube 300 are connected to the overflow pipe 33. The inside of the sealing tube 300 is slidably connected to the push plate 31. A connecting protrusion 32 is fixedly installed on one side of the push plate 31.

[0038] The telescopic balls 400 are evenly spaced and arranged in the middle of the top surface of the iron core 200. One end of the connecting protrusion 32 is fixedly connected to the movable end of the telescopic balls 400.

[0039] Guide grooves 500 are respectively formed at the top and side edges of the connection between the outer sheet 21 and the middle sheet 22 and the connection between the middle sheet 22 and the connection sheet 23 .

[0040] Among them, the internal cross-sections of the protruding plate 231 and the slot 221 are both T-shaped structures, the adjacent surfaces of the middle piece 22 and the connecting piece 23 and the adjacent surfaces of the outer layer piece 21 and the middle piece 22 are all fitted together, and the inner side of the outer layer piece 21 and the two sides of the connecting piece 23 in the iron core 200 are respectively integrally formed with a T-shaped protruding plate 231 by stamping, so that the outer layer piece 21 and the connecting piece 23 can be respectively plugged and fixed to each other through the protruding plate 231 and the corresponding slot 221 opened on the side of the middle piece 22.

[0041] The cams 231 on both sides of the connecting piece 23 are respectively plugged and fixed with the slots 221 on the side of the middle piece 22, and the cams 231 on the inner side of the outer layer piece 21 are respectively plugged and fixed with the corresponding slots 221 on the side of the middle piece 22. The outer layer piece 21 and the middle piece 22 as well as the middle piece 22 and the connecting piece 23 are respectively provided with mounting grooves 20 at equal intervals at the top of the connection points. The sealing tube 300 is fixedly installed in the inner wall of the corresponding mounting groove 20. The inner side of the outer layer piece 21 in the iron core 200 and the two sides of the connecting piece 23 are respectively integrally formed with T-shaped cams 231 by stamping, so that the outer layer piece 21 and the connecting piece 23 can be respectively plugged and fixed with each other through the cams 231 and the slots 221 opened on the side of the corresponding middle piece 22. In this way, multiple groups of thin sheets in the iron core 200 can be bonded by glue and can be assembled together to form a whole. In this way, even if there are cavities in the glue between multiple groups of thin sheets in the iron core 200 in the later stage, they can still be bitten together to avoid dislocation.

[0042] Among them, one end of the telescopic capsule ball 400 is fixedly installed at one end inside the mounting groove 20, and the sealing tube 300 slides in the corresponding inner wall of the mounting groove 20 near one end of the telescopic capsule ball 400. After the outer layer 21, the middle layer 22 and the connecting piece 23 are assembled by bonding, and then nested and assembled through the insulating shell 12, the top of the connection is injected with liquid glue before assembly through the sealing tube 300. Then, when the telescopic capsule ball 400 is exposed to a higher temperature, the push plate 31 is pushed by the telescopic end, so that the glue in the sealing tube 300 overflows outward through the overflow hole 331 on the overflow tube 33.

[0043] Among them, the guide groove 500 is respectively provided with through holes 51 near the slot 221 and the convex plate 231. The guide groove 500 at the top of the iron core 200 and the guide groove 500 on the side are respectively connected through the through holes 51. The push plate 31 extends into the corresponding guide groove 500. Overflow holes 331 are respectively provided on both sides of the push plate 31. The through holes 51 at both ends of the guide groove 500 connect the top connection of the thin sheet in the iron core 200 with the connection on both sides. The glue liquid is connected so that the glue liquid can be guided to the thin-sheet connection cavity in the iron core 200, so that after the telescopic capsule ball 400 is exposed to a higher temperature, it pushes the push plate 31 through the telescopic end, so that the glue liquid in the sealing tube 300 overflows outward through the overflow hole 331 on the overflow pipe 33, and the through holes 51 at both ends of the guide groove 500 connect the top connection of the thin sheet in the iron core 200 with the connection on both sides, so that the glue liquid can be guided to the thin-sheet connection cavity in the iron core 200 and fill it.

[0044] In this embodiment, T-shaped protruding plates 231 are formed integrally on the inner side of the outer layer sheet 21 and on both sides of the connecting sheet 23 in the iron core 200 by stamping, so that the outer layer sheet 21 and the connecting sheet 23 can be respectively plugged and fixed to each other through the protruding plates 231 and the slots 221 provided on the side of the corresponding intermediate sheet 22. In this way, the multiple groups of thin sheets in the iron core 200 can be bonded together by adhesive and can be assembled together to form a whole. In this way, even if the adhesive between the multiple groups of thin sheets in the iron core 200 later forms voids, they can still be bonded together to avoid misalignment.

[0045] In this embodiment, after the outer sheet 21, the middle sheet 22, and the connecting sheet 23 are assembled by bonding and then nested in the insulating shell 12, liquid glue is injected into the top of the connection through the sealing tube 300 before assembly. Then, when the telescopic capsule 400 is exposed to a high temperature, the push plate 31 is pushed by the telescopic end, causing the glue in the sealing tube 300 to overflow outward through the overflow hole 331 on the overflow tube 33. The through holes 51 at both ends of the guide groove 500 connect the top connection of the thin sheets in the iron core 200 with the connection on both sides. In this way, the glue can be guided to the connection cavity of the thin sheets in the iron core 200, filling it, so that the connection integrity between the multiple groups of outer sheets 21, the middle sheet 22, and the connecting sheet 23 is better.

[0046] Example 2:

[0047] Based on Example 1, this example introduces a winding fixing structure and a voltage transformer thereof, such as Figure 1-Figure 4 As shown, including:

[0048] A base 11 is fixedly installed at the bottom of the transformer body 100, a positioning groove 120 is opened at the bottom of the inner wall of the transformer body 100, an insulating shell 12 is nested outside the iron core 200, and the iron core 200 is fixedly installed inside the positioning groove 120 through the insulating shell 12. The primary winding 14 and the secondary winding 16 are respectively connected to the outside of the insulating shell 12. A winding shield 13 is fixedly installed at one end of the outside of the insulating shell 12, a high-voltage wire 160 is installed outside the secondary winding 16, and a terminal 15 is installed outside the primary winding 14. The current flows into the voltage transformer body 100 through the terminal 15 on the outside, passes through the primary winding 14, cooperates with the secondary winding 16, and the winding shield 13, and is surrounded by the iron core 200 to ensure the stability of the current flow and transformation.

[0049] Among them, epoxy cast insulation 17 is fixedly installed on both sides of the outside of the transformer body 100, and anti-fouling umbrella skirts 18 are fixedly installed on the outside of two groups of epoxy cast insulation 17. Blockers 19 are fixedly installed on the outside of the high-voltage wire 160 and the terminal 15. The two groups of blockers 19 are respectively fixedly installed in the inner walls of the corresponding epoxy cast insulation 17. The terminal 15 and the high-voltage wire 160 extend to the top of the epoxy cast insulation 17 respectively and are transported through the high-voltage wire 160. The primary winding 14 and the high-voltage wire 160 are highly insulated by the epoxy cast insulation 17 and protected on the outside by the anti-fouling umbrella skirts 18. The two groups of blockers 19 can disconnect the circuit and provide protection when they sense current abnormality. Through the cooperation of the explosion-proof shell outside the transformer body 100, the voltage transformer body 100 can be protected secondary.

[0050] In this embodiment, current flows into the voltage transformer body 100 through the terminal 15 on the external side, passes through the primary winding 14, cooperates with the secondary winding 16, and the winding shield 13, and is surrounded by the iron core 200 to ensure the stability of the current flow and transformation, and then is transmitted through the high-voltage wire 160. The primary winding 14 and the high-voltage wire 160 are highly insulated by epoxy cast insulation 17 and protected on the outside by anti-fouling umbrella skirt 18. When the two sets of blockers 19 sense current abnormality, they can disconnect the circuit for protection. Through the cooperation of the external explosion-proof shell of the transformer body 100, the voltage transformer body 100 can be protected secondary.

[0051] Working principle: When the voltage transformer is in use, current flows into the terminal 15 on the external side of the voltage transformer body 100, passes through the primary winding 14, cooperates with the secondary winding 16, and the winding shield 13, and is surrounded by the iron core 200 to ensure the stability of the current flow and transformation. The current is then transmitted through the high-voltage wire 160. The primary winding 14 and the high-voltage wire 160 are highly insulated by epoxy casting insulation 17, and are protected on the outside by anti-fouling umbrella skirts 18. When the two sets of blockers 19 sense current anomalies, they can disconnect the circuit for protection. Through the cooperation of the external explosion-proof shell of the transformer body 100, the voltage transformer body 100 can be protected secondary.

[0052] When assembling the winding core 200 in the voltage transformer, the outer layer sheets 21 and the connecting sheets 23 in the core 200 are first inserted and fixed to each other through the protruding plates 231 and the slots 221 provided on the side surfaces of the corresponding intermediate sheets 22. In this way, the multiple groups of thin sheets in the core 200 are bonded together by the adhesive and can be assembled together to form a whole. In this way, even if the adhesive between the multiple groups of thin sheets in the core 200 later forms voids, they can still be bonded together.

[0053] Then, the insulating shell 12 is nested on the outside of the multiple groups of assembled thin sheets. After the outer sheet 21, the middle sheet 22 and the connecting sheet 23 are assembled by bonding, liquid glue is injected into the top of the connection before assembly through the sealing tube 300. Then, when the telescopic balloon 400 is exposed to a high temperature, the push plate 31 is pushed by the telescopic end, so that the glue in the sealing tube 300 overflows outward through the overflow hole 331 on the overflow pipe 33, and the through holes 51 at both ends of the guide groove 500 connect the top connection of the thin sheet in the iron core 200 with the connection on both sides. In this way, the glue can be guided to the connection cavity of the thin sheet in the iron core 200 and filled, so that the connection integrity between the multiple groups of outer sheets 21, the middle sheet 22 and the connecting sheet 23 is better.

[0054] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes and modifications may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A winding fixing structure, comprising a transformer body (100), characterized in that: Also includes: An iron core (200) is fixedly mounted in the inner cavity of the transformer body (100), the iron core (200) further comprising an outer layer sheet (21), an intermediate sheet (22), and a connecting sheet (23), wherein convex plates (231) are integrally formed on the inner side of the outer layer sheet (21) and on the upper and lower parts of both sides of the connecting sheet (23), and slots (221) are respectively provided on the upper and lower parts of both sides of the intermediate sheet (22), and the convex plates (231) on the inner side of the outer layer sheet (21) and the slots (221) on the side of the intermediate sheet (22) are plugged and fixed to each other; Sealing tubes (300) are arranged at equal intervals in the middle of the top surface of the iron core (200), and overflow tubes (33) are respectively passed through and communicated with at both ends of the sealing tube (300). A push plate (31) is slidably connected inside the sealing tube (300), and a connecting protrusion (32) is fixedly installed on one side of the push plate (31); The telescopic capsule balls (400) are arranged at equal intervals in the middle of the top surface of the iron core (200), and one end of the connecting protrusion (32) is fixedly connected to the movable end of the telescopic capsule balls (400); Guide grooves (500) are respectively provided at the top and side edges of the connection point between the outer sheet (21) and the middle sheet (22) and the connection point between the middle sheet (22) and the connection sheet (23).

2. The winding fixing structure according to claim 1, characterized in that: The internal cross-sections of the convex plate (231) and the slot (221) are both T-shaped structures, and the adjacent surfaces of the middle piece (22) and the connecting piece (23) as well as the adjacent surfaces of the outer layer piece (21) and the middle piece (22) are in contact with each other.

3. The winding fixing structure according to claim 2, characterized in that: The convex plates (231) on both sides of the connecting piece (23) are respectively plugged and fixed with the slots (221) on the side of the middle piece (22), and the convex plates (231) on the inner side of the outer layer piece (21) are respectively plugged and fixed with the corresponding slots (221) on the side of the middle piece (22).

4. The winding fixing structure according to claim 3, characterized in that: Mounting grooves (20) are provided at equal intervals on the tops of the joints between the outer sheet (21) and the middle sheet (22), and between the middle sheet (22) and the joint sheet (23), and the sealing tubes (300) are fixedly mounted in the inner walls of the corresponding mounting grooves (20).

5. The winding fixing structure according to claim 4, characterized in that: One end of the telescopic capsule ball (400) is fixedly mounted on one end inside the mounting groove (20), and the sealing tube (300) slides in the corresponding inner wall of the mounting groove (20) near one end of the telescopic capsule ball (400).

6. The winding fixing structure according to claim 5, characterized in that: Through holes (51) are respectively provided in the guide groove (500) near the slot (221) and the convex plate (231), and the guide groove (500) at the top of the iron core (200) and the guide groove (500) at the side are connected through the through holes (51).

7. The winding fixing structure according to claim 6, characterized in that: The push plates (31) extend into the corresponding guide grooves (500), and overflow holes (331) are respectively provided on both sides of the push plates (31).

8. A voltage transformer according to claim 7, characterized in that: A base (11) is fixedly mounted on the bottom of the transformer body (100), a positioning groove (120) is provided on the bottom of the inner wall of the transformer body (100), an insulating shell (12) is nested outside the iron core (200), and the iron core (200) is fixedly mounted inside the positioning groove (120) through the insulating shell (12).

9. A voltage transformer according to claim 8, characterized in that: A primary winding (14) and a secondary winding (16) are respectively connected to the outside of the insulating shell (12); a winding shield (13) is fixedly mounted on one end of the outside of the insulating shell (12); a high-voltage wire (160) is mounted on the outside of the secondary winding (16); and a connection terminal (15) is mounted on the outside of the primary winding (14).

10. A voltage transformer according to claim 9, characterized in that: Epoxy cast insulation (17) is fixedly installed on both sides of the outside of the transformer body (100), and two groups of anti-fouling umbrella skirts (18) are fixedly installed on the outside of the epoxy cast insulation (17). Blockers (19) are fixedly installed on the outside of the high-voltage wire (160) and the terminal block (15), and the two groups of blockers (19) are respectively fixedly installed in the inner walls of the corresponding epoxy cast insulation (17). The terminal block (15) and the high-voltage wire (160) respectively extend to the top of the epoxy cast insulation (17).

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