Low leakage magnetic air core reactor

Abstract

The present invention relates to a low-leakage magnetic air-core reactor, comprising a hollow coil and a cross-sheet iron core surrounding the outer periphery of the hollow coil; the hollow coil has a hollow cavity which passes through from left to right, and the cross-sheet iron core is wrapped around the upper side, the left side, the lower side and the right side of the hollow coil; the cross-sheet iron core comprises a plurality of annular iron core sheet groups stacked front to back; each annular iron core sheet group comprises a plurality of iron core sheets, and the plurality of iron core sheets are connected end to end in sequence to form an annular shape, and a splicing part is formed between adjacent iron core sheets; and, in the front-to-back direction, the iron core sheets of the annular iron core sheet group cover the splicing part of the annular iron core sheet group adjacent thereto; the invention reduces the leakage magnetic field of the hollow-core reactor, reduces the heat energy loss, avoids the local overheating and discharge phenomenon, and greatly improves the performance of the iron core; and, the stacking method thereof is easy to operate, convenient for mass production, and conducive to popularization and application.

Description

Technical Field

[0001] The invention relates to the technical field of reactors, in particular to an air-core reactor with low magnetic leakage. Background Art

[0002] Existing air-core reactors have strong anti-saturation capabilities, large size, and large magnetic leakage. However, due to magnetic leakage, their application occasions are limited and they can only be used outdoors or in other places away from people.

[0003] With the development of technology, in order to solve the problem of large magnetic leakage, traditional air-core reactors use shielding layers. However, the effect of reducing magnetic leakage is not ideal. In addition, the cost is high, the operation is complicated, and it is difficult to mass produce, which is not conducive to promotion and application.

[0004] Therefore, in the patent application of the present invention, the applicant carefully studied a low leakage magnetic air-core reactor to solve the above problems. Summary of the invention

[0005] The present invention aims to overcome the deficiencies in the above-mentioned prior art and its main purpose is to provide a low-leakage magnetic air-core reactor, which can greatly reduce the leakage magnetic field of the air-core reactor, reduce heat energy loss, avoid local overheating and discharge, and greatly improve the performance of the core. Moreover, its stacking method is easy to operate and also convenient for mass production, which is conducive to promotion and application.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme:

[0007] A low-leakage magnetic air-core reactor comprises an air-core coil and a cross-sheet iron core surrounding the outer periphery of the air-core coil; the air-core coil has a hollow cavity extending from left to right, and the cross-sheet iron core is wrapped around the upper side, left side, lower side and right side of the air-core coil;

[0008] The cross-sheet core includes a plurality of annular core sheet groups stacked front to back; each annular core sheet group includes a plurality of core sheets, and the plurality of core sheets are sequentially connected end to end to form a ring, and a splicing portion is formed between adjacent core sheets; and, in the front-to-back direction, the core sheets of the annular core sheet group cover the splicing portion of the adjacent annular core sheet group.

[0009] As a preferred solution, each annular core sheet group includes four core sheets, each of which is in the shape of a rectangular sheet; in two adjacent annular core sheet groups:

[0010] The four core sheets of the annular core sheet group are defined as the first to fourth core sheets, the inner side of the tail end of the first core sheet is spliced ​​to the head end face of the second core sheet, the inner side of the tail end of the second core sheet is spliced ​​to the head end face of the third core sheet, the inner side of the tail end of the third core sheet is spliced ​​to the head end face of the fourth core sheet, and the inner side of the tail end of the fourth core sheet is spliced ​​to the head end face of the first core sheet;

[0011] The four core sheets of another annular core sheet group are defined as the fifth to eighth core sheets, the tail end face of the fifth core sheet is spliced ​​to the inner side of the head end portion of the sixth core sheet, the tail end face of the sixth core sheet is spliced ​​to the inner side of the head end portion of the seventh core sheet, the tail end face of the seventh core sheet is spliced ​​to the inner side of the head end portion of the eighth core sheet, and the tail end face of the eighth core sheet is spliced ​​to the inner side of the head end portion of the fifth core sheet.

[0012] As a preferred solution, the core sheets are silicon steel sheets.

[0013] As a preferred solution, the annular core sheet group is a rectangular ring.

[0014] As a preferred solution, it also includes a first rod, a second rod, a third rod, a fourth rod and four clamping plates with an L-shaped cross section, each clamping plate has a first side and a second side perpendicular to the first side, and the four clamping plates are respectively defined as a first clamping plate to a fourth clamping plate;

[0015] The front and rear ends of the cross-piece core are respectively limited between the second side edge of the first clamping plate and the second side edge of the second clamping plate, and between the second side edge of the third clamping plate and the second side edge of the fourth clamping plate;

[0016] The left and right ends of the hollow coil are respectively connected to a left insulating end plate and a right insulating end plate, and the hollow coil is clamped between the left insulating end plate and the right insulating end plate; the left end of the left insulating end plate is respectively limited by the first side edge of the third clamping plate and the first side edge of the fourth clamping plate, and the right end of the right insulating end plate is respectively limited by the first side edge of the first clamping plate and the first side edge of the second clamping plate;

[0017] The first rod body sequentially passes through the first side edge of the first clamping plate, the right insulating end plate, and the left insulating end plate to be connected to the first side edge of the fourth clamping plate, and both ends of the first rod body are equipped with first fastening nuts, the second rod body sequentially passes through the first side edge of the second clamping plate, the right insulating end plate, and the left insulating end plate to be connected to the first side edge of the third clamping plate, and both ends of the second rod body are equipped with second fastening nuts, the third rod body passes through the second side edge of the first clamping plate to be connected to the second side edge of the second clamping plate, and both ends of the third rod body are equipped with third fastening nuts, the fourth rod body passes through the second side edge of the fourth clamping plate to be connected to the second side edge of the third clamping plate, and both ends of the fourth rod body are equipped with fourth fastening nuts.

[0018] As a preferred solution, the first side edge of each splint is connected to the second side edge via a reinforcing rib.

[0019] As a preferred solution, spacers are provided between adjacent hollow coils, between the hollow coil and the left insulating end plate, and between the hollow coil and the right insulating end plate.

[0020] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, the present invention mainly comprises a plurality of annular core sheet groups which are stacked front and back and then wrapped around an air-core coil, and the plurality of core sheets are sequentially connected end to end to form an annular shape. In the front-to-back direction, the core sheets of the annular core sheet group cover the joints of the adjacent annular core sheet groups, thereby reducing the magnetic leakage of the air-core reactor, reducing the heat loss, avoiding local overheating and discharge, and greatly improving the performance of the core. Moreover, the stacking method is easy to operate, convenient for mass production, and conducive to popularization and application.

[0021] Secondly, through the coordinated design of multiple rods and multiple fastening nuts, the stability of the front and back stacking of the annular core sheet groups, the stability of the installation between the insulating end plates, and the stability between the cross-sheet core and the insulating end plates are ensured;

[0022] In addition, the overall structural design is ingenious and reasonable, and the various parts are easy and firm to assemble, ensuring the stability and reliability of the air-core reactor during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a front view of an embodiment of the present invention;

[0024] Figure 2 is a side view of an embodiment of the present invention;

[0025] Figure 3 is a top view of an embodiment of the present invention;

[0026] Figure 4 is a front view of a cross-piece core according to an embodiment of the present invention;

[0027] Figure 5 is a front view of one of two adjacent annular core sheet groups according to an embodiment of the present invention;

[0028] Figure 6 yes Figure 5 Schematic diagram of the decomposition structure;

[0029] Figure 7 is a front view of another annular core sheet group of two adjacent annular core sheet groups according to an embodiment of the present invention;

[0030] Figure 8 yes Figure 7 Schematic diagram of the decomposition structure.

[0031] Description of Figure Numbers:

[0032] 10. Air-core coil

[0033] 20. Cross-section core

[0034] 21. First core sheet 211. First end surface

[0035] 212, inside of the tail end

[0036] 22. Second core sheet 221. First end surface

[0037] 222, inside of the tail end

[0038] 23. The third core sheet 231. The first end surface

[0039] 232, inside of the tail end

[0040] 24. Fourth core sheet 241. First end surface

[0041] 242, inside of the tail end

[0042] 25. Fifth core sheet 251. Tail end surface

[0043] 252, Inside of the head end

[0044] 26. Sixth core sheet 261. Tail end surface

[0045] 262, inside of the head

[0046] 27. Seventh core sheet 271. Tail end surface

[0047] 272, Inside of the head

[0048] 28. Eighth core sheet 281. Tail end face

[0049] 282, Inside of the head

[0050] 31. Left insulating end plate 32. Right insulating end plate

[0051] 33. Pad

[0052] 41. first rod body 411. first fastening nut

[0053] 42. Second rod body 421. Second fastening nut

[0054] 43. third rod body 431. third fastening nut

[0055] 44, fourth rod body 441, fourth fastening nut

[0056] 501, first side 502, second side

[0057] 503. Reinforcement

[0058] 51. First splint 52. Second splint

[0059] 53. Third splint 54. Fourth splint. DETAILED DESCRIPTION

[0060] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0061] like Figures 1 to 8 As shown, a low leakage magnetic air-core reactor is mainly used in a DC circuit. It includes an air-core coil 10 and a cross-sheet iron core 20 surrounding the outer periphery of the air-core coil 10; the air-core coil 10 has a hollow cavity that passes through the left and right sides, and the cross-sheet iron core 20 is wrapped around the upper side, left side, lower side and right side of the air-core coil 10;

[0062] The cross-sheet core 20 includes a plurality of annular core sheet groups stacked front and back; each annular core sheet group includes a plurality of core sheets, preferably, the annular core sheet group is a rectangular ring; the core sheets are silicon steel sheets. The plurality of core sheets are connected end to end in sequence to form a ring shape, and a joint is formed between adjacent core sheets; and, in the front-to-back direction, the core sheets of the annular core sheet group cover the joint of the adjacent annular core sheet group.

[0063] In this embodiment, each annular core sheet group includes four core sheets, each of which is in the shape of a rectangular sheet; in two adjacent annular core sheet groups:

[0064] The four core sheets of the first annular core sheet group are defined as the first to fourth core sheets, the inner side 212 of the tail end of the first core sheet 21 is spliced ​​to the head end face 221 of the second core sheet 22, the inner side 222 of the tail end of the second core sheet is spliced ​​to the head end face 231 of the third core sheet 23, the inner side 232 of the tail end of the third core sheet 23 is spliced ​​to the head end face 241 of the fourth core sheet 24, and the inner side 242 of the tail end of the fourth core sheet 24 is spliced ​​to the head end face 211 of the first core sheet 21;

[0065] The four core sheets of another annular core sheet group are defined as the fifth to eighth core sheets, the tail end face 251 of the fifth core sheet 25 is spliced ​​to the inner side 262 of the head end portion of the sixth core sheet 26, the tail end face 261 of the sixth core sheet 26 is spliced ​​to the inner side 272 of the head end portion of the seventh core sheet 27, the tail end face 271 of the seventh core sheet 27 is spliced ​​to the inner side 282 of the head end portion of the eighth core sheet 28, and the tail end face 281 of the eighth core sheet 28 is spliced ​​to the inner side 252 of the head end portion of the fifth core sheet 25.

[0066] In this embodiment, it also includes a first rod body 41, a second rod body 42, a third rod body 43, a fourth rod body 44 and four splints with an L-shaped cross-section, each splint has a first side 501 and a second side 502 perpendicular to the first side 501, and the four splints are respectively defined as a first splint 51 to a fourth splint 54. Preferably, the first side 501 of each splint is connected to the second side 502 by a reinforcing rib 503.

[0067] The front and rear ends of the cross-piece core are respectively limited between the second side edge 502 of the first clamping plate 51 and the second side edge 502 of the second clamping plate 52, and between the second side edge 502 of the third clamping plate 53 and the second side edge 502 of the fourth clamping plate 54;

[0068] The left and right ends of the hollow coil 10 are respectively connected to the left insulating end plate 31 and the right insulating end plate 32. Preferably, a spacer 33 is provided between adjacent hollow coils 10, between the hollow coil 10 and the left insulating end plate 31, and between the hollow coil 10 and the right insulating end plate 32. The hollow coil 10 is clamped between the left insulating end plate 31 and the right insulating end plate 32; the left end of the left insulating end plate 31 is respectively limited by the first side edge 501 of the third clamping plate 53 and the first side edge 501 of the fourth clamping plate 54, and the right end of the right insulating end plate 32 is respectively limited by the first side edge 501 of the first clamping plate 51 and the first side edge 501 of the second clamping plate 52;

[0069] The first rod body 41 passes through the first side edge 501 of the first clamping plate 51, the right insulating end plate 32, and the left insulating end plate 31 in sequence to be connected to the first side edge 501 of the fourth clamping plate 54, and the first rod body 41 is equipped with first fastening nuts 411 at both ends. The second rod body 42 passes through the first side edge 501 of the second clamping plate 52, the right insulating end plate 32, and the left insulating end plate 31 in sequence to be connected to the first side edge 501 of the third clamping plate 53, and the second rod body 42 is equipped with second fastening nuts 421 at both ends. The third rod body 43 passes through the second side edge 502 of the first clamping plate 51 to be connected to the second side edge 502 of the second clamping plate 52, and the third rod body 43 is equipped with third fastening nuts 431 at both ends. The fourth rod body 44 passes through the second side edge 502 of the fourth clamping plate 54 to be connected to the second side edge 502 of the third clamping plate 53, and the fourth rod body 44 is equipped with fourth fastening nuts 441 at both ends.

[0070] The key points of the design of the present invention are: it is mainly through a plurality of annular iron core sheet groups stacked front and back and then wrapped in an air-core coil, and the plurality of iron core sheets are sequentially connected end to end to form an annular shape, in the front and back direction, the iron core sheets of the annular iron core sheet group cover the splicing of the adjacent annular iron core sheet group, reducing the leakage magnetic field of the air-core reactor, reducing heat energy loss, avoiding local overheating and discharge phenomena, greatly improving the performance of the iron core, and the stacking method is easy to operate, convenient for mass production, and conducive to popularization and application;

[0071] Secondly, through the coordinated design of multiple rods and multiple fastening nuts, the stability of the front and back stacking of the annular core sheet groups, the stability of the installation between the insulating end plates, and the stability between the cross-sheet core and the insulating end plates are ensured;

[0072] In addition, the overall structural design is ingenious and reasonable, and the various parts are easy and firm to assemble, ensuring the stability and reliability of the air-core reactor during use.

[0073] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A low-leakage magnetic air-core reactor, characterized in that: It includes a hollow coil and a cross-sheet iron core surrounding the outer periphery of the hollow coil; the hollow coil has a hollow cavity that passes through the left and right sides, and the cross-sheet iron core is wrapped around the upper side, left side, lower side and right side of the hollow coil; The cross-piece core includes a plurality of annular core sheet groups stacked front and back; each annular core sheet group includes a plurality of core sheets, and the plurality of core sheets are sequentially connected end to end to form a ring shape, and a splicing portion is formed between adjacent core sheets; and in the front-to-back direction, the core sheets of the annular core sheet group cover the splicing portion of the adjacent annular core sheet group; Each annular core sheet group includes four core sheets, each of which is in the shape of a rectangular sheet; in two adjacent annular core sheet groups: The four core sheets of the annular core sheet group are defined as the first to fourth core sheets, the inner side of the tail end of the first core sheet is spliced ​​to the head end face of the second core sheet, the inner side of the tail end of the second core sheet is spliced ​​to the head end face of the third core sheet, the inner side of the tail end of the third core sheet is spliced ​​to the head end face of the fourth core sheet, and the inner side of the tail end of the fourth core sheet is spliced ​​to the head end face of the first core sheet; The four core sheets of another annular core sheet group are defined as the fifth to eighth core sheets, the tail end surface of the fifth core sheet is spliced ​​to the inner side of the head end of the sixth core sheet, the tail end surface of the sixth core sheet is spliced ​​to the inner side of the head end of the seventh core sheet, the tail end surface of the seventh core sheet is spliced ​​to the inner side of the head end of the eighth core sheet, and the tail end surface of the eighth core sheet is spliced ​​to the inner side of the head end of the fifth core sheet; It also includes a first rod body, a second rod body, a third rod body, a fourth rod body and four clamping plates with L-shaped cross-sections, each clamping plate has a first side and a second side perpendicular to the first side, and the four clamping plates are respectively defined as a first clamping plate to a fourth clamping plate; the first side of each clamping plate is connected to the second side by a reinforcing rib; the front and rear ends of the cross-piece type iron core are respectively limited between the second side of the first clamping plate and the second side of the second clamping plate, and between the second side of the third clamping plate and the second side of the fourth clamping plate; The left and right ends of the hollow coil are respectively connected to a left insulating end plate and a right insulating end plate, and the hollow coil is sandwiched between the left insulating end plate and the right insulating end plate; pads are provided between adjacent hollow coils, between the hollow coil and the left insulating end plate, and between the hollow coil and the right insulating end plate; The left end of the left insulating end plate is respectively limited by the first side edge of the third splint and the first side edge of the fourth splint, and the right end of the right insulating end plate is respectively limited by the first side edge of the first splint and the first side edge of the second splint; the first rod body passes through the first side edge of the first splint, the right insulating end plate, and the left insulating end plate in sequence to connect to the first side edge of the fourth splint, and both ends of the first rod body are equipped with first fastening nuts, the second rod body passes through the first side edge of the second splint, the right insulating end plate, and the left insulating end plate in sequence to connect to the first side edge of the third splint, and both ends of the second rod body are equipped with second fastening nuts, the third rod body passes through the second side edge of the first splint and is connected to the second side edge of the second splint, and both ends of the third rod body are equipped with third fastening nuts, the fourth rod body passes through the second side edge of the fourth splint and is connected to the second side edge of the third splint, and both ends of the fourth rod body are equipped with fourth fastening nuts.

2. The low-leakage magnetic air-core reactor according to claim 1, characterized in that: The core sheets are silicon steel sheets.

3. The low-leakage magnetic air-core reactor according to claim 1, characterized in that: The annular core sheet group is in the form of a rectangular ring.

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