A foil coil structure with enhanced short-circuit resistance

Abstract

The present invention discloses a foil-type coil structure with enhanced short-circuit resistance, comprising a bobbin and a coil wound around the outer surface of the bobbin, an interlayer insulating layer disposed within a gap of the coil, a foil fixedly connected to the outer surface of the coil, sliding insulating rings slidably connected to the top and bottom of the outer surface of the bobbin, and end insulation fixedly connected to the top and bottom of the bobbin. The present invention relates to the technical field of coil structures. The foil-type coil structure with enhanced short-circuit resistance employs bolts to bring two adjacent connecting frames closer together, the connecting frames driving two adjacent sliding sleeves toward each other, the sliding sleeves compressing extruded steel bars to drive the movement of insulating pads, and the two insulating pads respectively compressing a second output wire row and the extruded steel bars, thereby securing the second output wire row and the extruded steel bars. The structure is simple and convenient to operate, and does not require welding, thereby preventing the foil from being welded through and insufficient current-carrying contact area, thereby increasing the stability of the coil.

Description

Technical Field

[0001] The present invention relates to the technical field of coil structures, in particular to a foil-type coil structure with enhanced short-circuit resistance. Background Art

[0002] Foil coils are made of one or more wires wound in parallel and are a type of layered coil. Unlike cylindrical coils, the conductor of a foil coil is a thin and wide copper foil or aluminum foil. It has only one turn in the axial direction and multiple turns in the radial direction. After a few turns, there will be an axial oil gap. This structure is mainly used in low-voltage, small-capacity transformers.

[0003] The leads of existing foil coils are generally welded with copper bars or aluminum bars and copper foil or aluminum foil, and then led out. However, this structure has disadvantages. When the thickness of the copper foil or aluminum foil is relatively thin, it is very difficult to weld the copper bars or aluminum bars to the foil, which can easily cause the copper foil or aluminum foil to be welded through, resulting in insufficient contact area for current carrying, and the phenomenon of desoldering will occur with a little force. Such coils have great quality risks, and most of the existing foil coils have simple structures and cannot be adjusted. When different coils are needed, different winding bobbins need to be made, which has low applicability. In addition, the interlayer insulation of existing foil coils is mostly insulated with insulating paper. When the transformer is short-circuited, it withstands radial short-circuit force and axial short-circuit force, and the insulating paper has a low ability to resist short-circuit force, which may cause damage, thereby affecting the normal use of the device. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In response to the shortcomings of the existing technology, the present invention provides a foil coil structure with enhanced short-circuit resistance, which solves the problem that welding the copper or aluminum busbar to the foil is very difficult and cannot be adjusted, resulting in the need to produce different winding bobbins and insulating paper with low ability to resist short-circuit forces.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a foil coil structure with enhanced short-circuit resistance, comprising a winding bobbin and a coil wound on the outer surface of the winding bobbin, an interlayer insulation layer is provided in the gap of the coil, the outer surface of the coil is fixedly connected with a foil, the top and bottom of the outer surface of the winding bobbin are slidably connected with sliding insulation rings, the top and bottom of the winding bobbin are fixedly connected with end insulation, the sliding insulation rings and the end insulation are connected by an adjustment mechanism, the outer surface of the end insulation is fixedly connected with a first threaded sleeve, the inner surface of the first threaded sleeve is threadedly connected with a first threaded rod, one side of the outer surface of the first threaded rod is slidably connected with a first wire output row, the other side of the outer surface of the first threaded rod is slidably connected with a second wire output row, and an extrusion mechanism is provided between the first wire output row and the second wire output row.

[0008] Preferably, the extrusion mechanism includes two extruded steel bars and four sliding sleeves, the inner surfaces of the extruded steel bars are slidably connected to the outer surface of the first threaded rod, and the inner surfaces of the sliding sleeves are slidably connected to the outer surface of the first threaded rod.

[0009] Preferably, an insulating pad is fixedly connected to the outer surface of the extruded steel bar, and the outer surface of the insulating pad is in close contact with the outer surface of the first output line row. The outer surface of the sliding sleeve is fixedly connected to a connecting frame, and two adjacent connecting frames are connected by bolts.

[0010] Preferably, the adjustment mechanism includes a second threaded rod and a second threaded sleeve, one end of the second threaded rod is fixedly connected to the outer surface of the sliding insulating ring, one end of the second threaded rod passes through the end insulation and extends to the outside of the end insulation, and the number of second threaded rods is set to be several, and the outer surface of the second threaded rod is threadedly connected to the inner surface of the second threaded sleeve.

[0011] Preferably, a first annular groove is provided on the top of the end insulation, the inner surface of the first annular groove is slidably connected to the bottom of the second threaded sleeve through a slider, and the outer surface of the second threaded sleeve is fixedly connected to the first tooth ring.

[0012] Preferably, a second annular groove is provided on the top of the end insulation, and the inner surface of the second annular groove is slidably connected to a second tooth ring that is adapted to the first tooth ring through a slider.

[0013] Preferably, the interlayer insulating layer comprises insulating paper and two interlayer resins, and the outer surface of the interlayer resin is fixedly connected to the outer surface of the insulating paper.

[0014] Preferably, the inner surface of the insulating paper is fixedly connected to the outer surface of the winding bobbin.

[0015] (3) Beneficial effects

[0016] The present invention provides a foil coil structure with enhanced short-circuit resistance. It has the following beneficial effects:

[0017] (1) The foil coil structure with enhanced short-circuit resistance is provided with a winding bobbin, a coil, an interlayer insulating layer, a foil, a sliding insulating ring, an adjusting mechanism, a first threaded sleeve, a first threaded rod, a first outlet row, a second outlet row, an extruded steel bar, an insulating pad, a sliding sleeve, a connecting frame, a bolt and an extruding mechanism. Two adjacent connecting frames are brought close together by bolts, and the connecting frame drives two adjacent sliding sleeves to move close to each other. The sliding sleeves squeeze the extruded steel bar to drive the insulating pad to move, and the two insulating pads squeeze the second outlet row and the extruded steel bar respectively, so that the second outlet row and the extruded steel bar are fixed. The operation is simple and convenient, and no welding operation is required, thereby avoiding the foil from being welded through and avoiding insufficient contact area for current carrying, thereby increasing the stability of the coil.

[0018] (2) The foil coil structure with enhanced short-circuit resistance is provided with a second threaded rod, a second threaded sleeve, a first toothed ring, a first annular groove, a second annular groove and a second toothed ring. The second toothed ring is rotated to drive the first toothed ring to rotate the second threaded sleeve. The second threaded sleeve is rotated to move the second threaded rod. The second threaded rod drives the sliding insulating ring to move, thereby adjusting the distance between the two sliding insulating rings. Therefore, the winding drum can be wound with coils of different numbers of turns, thereby increasing the applicability of the device.

[0019] (3) The foil coil structure with enhanced short-circuit resistance includes an interlayer insulation layer including insulating paper and two interlayer resins. The outer surface of the interlayer resin is fixedly connected to the outer surface of the insulating paper, and the inner surface of the insulating paper is fixedly connected to the outer surface of the winding drum. The top and bottom of the insulating paper are filled with interlayer resin. After the interlayer resin is poured, the coil is solidified and stably, which increases the ability of the insulating paper to resist short-circuit force, improves the short-circuit resistance of the device, and ensures reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the internal structure of the present invention;

[0021] Figure 2 Schematic diagram of the internal structure of the present invention;

[0022] Figure 3 A top view of the present invention;

[0023] Figure 4 For the present invention Figure 2 A partial enlarged schematic diagram of point A in the middle;

[0024] Figure 5 Schematic diagram of the structure of the interlayer insulating layer of the present invention;

[0025] In the figure, 1. winding bobbin; 2. coil; 3. interlayer insulation layer; 4. foil; 5. sliding insulation ring; 6. adjustment mechanism; 7. first threaded sleeve; 8. first threaded rod; 9. first outlet row; 10. second outlet row; 11. extruded steel bar; 12. insulating pad; 13. sliding sleeve; 14. connecting frame; 15. bolt; 16. second threaded rod; 17. second threaded sleeve; 18. first tooth ring; 19. first annular slide; 20. second annular slide; 21. second tooth ring; 22. insulating paper; 23. interlayer resin; 24. end insulation; 25. extrusion mechanism. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figure 1-5The embodiment of the present invention provides a technical solution: a foil coil structure with enhanced short-circuit resistance, comprising a bobbin 1 and a coil 2 wound on the outer surface of the bobbin 1, an interlayer insulating layer 3 is provided in the gap of the coil 2, a foil 4 is fixedly connected to the outer surface of the coil 2, the top and bottom of the outer surface of the bobbin 1 are slidably connected to sliding insulating rings 5, the sliding insulating rings 5 are made of insulating rubber and steel plates, the top and bottom of the bobbin 1 are fixedly connected to end insulation 24, the end insulation 24 is brushed with epoxy insulating glue after winding, and the strength of the end insulation is enhanced after drying, the sliding insulating ring 5 and the end insulation 24 are connected by an adjusting mechanism 6, the outer surface of the end insulation 24 is fixedly connected to a first threaded sleeve 7, the inner surface of the first threaded sleeve 7 is threadedly connected to a first threaded rod 8, one side of the outer surface of the first threaded rod 8 is slidably connected to a first output line row 9, the other side of the outer surface of the first threaded rod 8 is slidably connected to a second output line row 10, an extrusion mechanism 25 is provided between the first output line row 9 and the second output line row 10, the extrusion mechanism 2 5 includes two extruded steel bars 11 and four sliding sleeves 13. The inner surface of the extruded steel bar 11 is slidably connected to the outer surface of the first threaded rod 8. The inner surface of the sliding sleeve 13 is slidably connected to the outer surface of the first threaded rod 8. The outer surface of the extruded steel bar 11 is fixedly connected to an insulating pad 12. The insulating pad 12 is made of insulating rubber and is in close contact with the outer surface of the first outgoing wire row 9. The outer surface of the sliding sleeve 13 is fixedly connected to a connecting frame 14. Two adjacent connecting frames 14 are connected by bolts 15. The bolts 15 bring the two adjacent connecting frames 14 closer together. The connecting frame 14 drives the two adjacent sliding sleeves 13 closer together. The sliding sleeves 13 squeeze the extruded steel bar 11 and move the insulating pads 12. The two insulating pads 12 respectively squeeze the second outgoing wire row 10 and the extruded steel bar 11, thereby fixing the second outgoing wire row 10 and the extruded steel bar 11. The operation is simple and convenient, and no welding operation is required, thereby preventing the foil 4 from being welded through and insufficient contact area for current carrying, thereby increasing the stability of the coil.

[0028] Furthermore, the adjustment mechanism 6 includes a second threaded rod 16 and a second threaded sleeve 17, one end of the second threaded rod 16 is fixedly connected to the outer surface of the sliding insulating ring 5, one end of the second threaded rod 16 passes through the end insulation 24 and extends to the outside of the end insulation 24, the number of the second threaded rod 16 is set to be several, the outer surface of the second threaded rod 16 is threadedly connected to the inner surface of the second threaded sleeve 17, the top of the end insulation 24 is provided with a first annular groove 19, the inner surface of the first annular groove 19 is slidably connected to the bottom of the second threaded sleeve 17 through a slider, and the outer surface of the second threaded sleeve 17 is provided with a first annular groove 19. The surface is fixedly connected with a first toothed ring 18, and a second annular groove 20 is opened on the top of the end insulation 24. The inner surface of the second annular groove 20 is slidably connected with a second toothed ring 21 adapted to the first toothed ring 18 through a slider. Rotating the second toothed ring 21 drives the first toothed ring 18 to rotate the second threaded sleeve 17. The rotation of the second threaded sleeve 17 moves the second threaded rod 16. The second threaded rod 16 drives the sliding insulating ring 5 to move, thereby adjusting the distance between the two sliding insulating rings 5, so that the winding drum 1 can be wound with coils 2 of different numbers of turns, thereby increasing the applicability of the device.

[0029] Furthermore, the interlayer insulation layer 3 includes insulating paper 22 and two interlayer resins 23. The outer surface of the interlayer resin 23 is fixedly connected to the outer surface of the insulating paper 22, and the inner surface of the insulating paper 22 is fixedly connected to the outer surface of the winding drum 1. The interlayer resin 23 is filled on the top and bottom of the insulating paper 22. After the interlayer resin 23 is poured, the coil is solidified stably, which increases the ability of the insulating paper 22 to resist short-circuit force, improves the short-circuit resistance of the device, and ensures reliable operation.

[0030] During operation, the second toothed ring 21 is rotated to drive the first toothed ring 18 to make the second threaded sleeve 17 rotate around the first annular groove 19. Since the second threaded rod 16 is threadedly connected to the second threaded sleeve 17, the second threaded sleeve 17 rotates to move the second threaded rod 16, and the second threaded rod 16 drives the sliding insulating ring 5 to move, thereby adjusting the distance between the two sliding insulating rings 5. After the adjustment is completed, the coil 2 is wound on the outer surface of the winding drum 1 and between the two sliding insulating rings 5. After the winding is completed, the interlayer resin 23 is filled on the top and bottom of the insulating paper 22. After the interlayer resin 23 is poured and solidified, one sliding The sleeve 13, an extruded steel bar 11 and the second outgoing line row 10 are inserted into the first threaded rod 8, the first threaded rod 8 is rotated to make the first threaded rod 8 pass through the first threaded sleeve 7, and the first outgoing line row 9, another extruded steel bar 11 and another sliding sleeve 13 are inserted into the first threaded rod 8 in turn. The two adjacent connecting frames 14 are brought close to each other by the bolts 15. The connecting frames 14 drive the two adjacent sliding sleeves 13 to approach each other. The sliding sleeve 13 squeezes the extruded steel bar 11 to drive the insulating pad 12 to move. The two insulating pads 12 squeeze the second outgoing line row 10 and the extruded steel bar 11 respectively, so that the second outgoing line row 10 and the extruded steel bar 11 are fixed.

[0031] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A foil coil structure with enhanced short-circuit resistance, comprising a bobbin (1) and a coil (2) wound on the outer surface of the bobbin (1), characterized in that: An interlayer insulating layer (3) is provided in the gap of the coil (2), a foil (4) is fixedly connected to the outer surface of the coil (2), a sliding insulating ring (5) is slidably connected to the top and bottom of the outer surface of the winding drum (1), an end insulation (24) is fixedly connected to the top and bottom of the winding drum (1), the sliding insulating ring (5) and the end insulation (24) are connected via an adjustment mechanism (6), a first threaded sleeve (7) is fixedly connected to the outer surface of the end insulation (24), a first threaded rod (8) is threadedly connected to the inner surface of the first threaded sleeve (7), a first output line row (9) is slidably connected to one side of the outer surface of the first threaded rod (8), a second output line row (10) is slidably connected to the other side of the outer surface of the first threaded rod (8), and an extrusion mechanism (25) is provided between the first output line row (9) and the second output line row (10); The extrusion mechanism (25) comprises two extruded steel bars (11) and four sliding sleeves (13), wherein the inner surface of the extruded steel bars (11) is slidably connected to the outer surface of the first threaded rod (8), and the inner surface of the sliding sleeve (13) is slidably connected to the outer surface of the first threaded rod (8); An insulating pad (12) is fixedly connected to the outer surface of the extruded steel bar (11), and the outer surface of the insulating pad (12) is in close contact with the outer surface of the first outgoing line row (9). A connecting frame (14) is fixedly connected to the outer surface of the sliding sleeve (13), and two adjacent connecting frames (14) are connected by bolts (15).

2. The foil coil structure with enhanced short-circuit resistance according to claim 1, characterized in that: The adjusting mechanism (6) comprises a second threaded rod (16) and a second threaded sleeve (17), one end of the second threaded rod (16) is fixedly connected to the outer surface of the sliding insulating ring (5), one end of the second threaded rod (16) passes through the end insulation (24) and extends to the outside of the end insulation (24), a plurality of second threaded rods (16) are provided, and the outer surface of the second threaded rod (16) is threadedly connected to the inner surface of the second threaded sleeve (17).

3. The foil coil structure with enhanced short-circuit resistance according to claim 2, characterized in that: A first annular groove (19) is provided at the top of the end insulation (24), the inner surface of the first annular groove (19) is slidably connected to the bottom of the second threaded sleeve (17) through a slider, and the outer surface of the second threaded sleeve (17) is fixedly connected to the first tooth ring (18).

4. The foil coil structure with enhanced short-circuit resistance according to claim 3, characterized in that: A second annular slot (20) is provided on the top of the end insulation (24), and the inner surface of the second annular slot (20) is slidably connected to a second tooth ring (21) adapted to the first tooth ring (18) via a slider.

5. The foil coil structure with enhanced short-circuit resistance according to claim 1, characterized in that: The interlayer insulating layer (3) comprises insulating paper (22) and two interlayer resins (23), and the outer surface of the interlayer resin (23) is fixedly connected to the outer surface of the insulating paper (22).

6. The foil coil structure with enhanced short-circuit resistance according to claim 5, characterized in that: The inner surface of the insulating paper (22) is fixedly connected to the outer surface of the bobbin (1).

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