A coil assembly and high-voltage direct-current contactor

Abstract

The utility model discloses a coil assembly and high voltage direct current contactor, including the shell, the shell is equipped with the skeleton along the axial direction, and the coil is formed by the enameled wire that is wound on the skeleton in the shell, and the enameled wire outer circumferential wall surface is wound with adhesive tape, the skeleton includes the inner tube, and the inner tube both ends respectively along the circumferential extension and form end plate no.

Description

Technical Field

[0001] This utility model relates to the field of DC contactor technology, and in particular to a coil assembly and a high-voltage DC contactor. Background Technology

[0002] A contactor is a widely used switching electrical device. The coil assembly, as the starting unit of the contactor, is an important component of the contactor. The coil assembly generally consists of a frame and enameled wire, with the enameled wire evenly wound on the frame.

[0003] Coil breakdown (burning) is a common fault in contactors, and insufficient insulation protection is one of the reasons why coils are prone to breakdown.

[0004] In existing contactors, insulation is mainly achieved using adhesive tape. During coil assembly manufacturing, after the enameled wire is wound onto the bobbin, two more turns of tape are wrapped around it to achieve insulation. However, the insulation performance provided by the adhesive tape is limited, and it is particularly unsuitable for applications requiring high insulation in both high-voltage and low-voltage control circuits. Utility Model Content

[0005] To address the aforementioned issues, this application provides a coil assembly with a reasonable structure and a high-voltage DC contactor, thereby effectively improving and ensuring the insulation performance of the coil assembly. It features a simple structure, convenient operation, reliable use, and good practicality, and is particularly suitable for applications requiring high insulation between the high-voltage and low-voltage control circuits.

[0006] The technical solution adopted in this utility model is as follows: A coil assembly includes a housing, an axially mounted frame, and an enameled wire wound around the frame inside the housing to form a coil. The outer circumferential wall of the enameled wire is wrapped with adhesive tape. The frame includes an inner cylinder, with two circumferentially extending end plates 1 and 2 at its two ends. End plate 1 is centered and mounted to the housing, and end plate 2 has a gap with the inner wall of the housing. The outer end face of end plate 2 is provided with circumferentially arranged ribs, and epoxy resin is filled between the ribs on the outer end face of end plate 2 and the inner wall of the housing.

[0007] As a further improvement to the above technical solution: The inner cylinder end face extends out of the end plate two and is arranged concentrically with the ring reinforcement to form an inner and outer double-layer reinforcement structure. The double-layer reinforcement structure is connected by a convex ridge extending radially between the two layers of reinforcement. The convex ridge extends outward from the ring reinforcement and has a beveled end at the edge of the end plate two.

[0008] The second end plate is a circular structure that conforms to the inner wall of the outer shell. The radial edge of the circular structure fits and conforms to the inner wall of the outer shell. The outer wall of the outer shell protrudes outward from the second end plate in the axial direction. The outer end face edge of the second end plate is provided with a chamfer structure.

[0009] The end plate 2 is evenly recessed along its circumferential edge to form a straight edge, and a gap is formed between the straight edge and the inner wall surface of the outer shell.

[0010] The outer shell has a convex shell portion, and two convex shell portions are arranged opposite each other along the diameter direction of the outer shell. A single convex shell portion is arranged through the outer shell along the axial direction. A gap is formed between the inner wall surface of the convex shell portion and the end plate. The two straight edges are located at the convex shell portion.

[0011] The two outer end faces of the end plate extend to form a lead seat, and the lead wires from the coil are led outward through the lead seat. The lead seat extends toward the ring rib to form an extension rib. The lead seat is located at one of the convex shell parts.

[0012] The radial dimension of the tape wrapped around the coil is smaller than that of end plate one and end plate two, and the outer wall of the tape and the inner wall of the outer shell form a circumferential space.

[0013] The outer end face of the end plate forms an inner ring surface and an outer ring surface from the inside to the outside with the inner cylinder as the center. The inner ring surface and the outer ring surface form a step facing outward in the circumferential direction. The end of the outer shell extends inward in the circumferential direction to form a folded edge. The inner edge of the folded edge is pressed against the step of the end face of the frame end plate.

[0014] The inner side of the folded edge extends to form a protrusion, which fits and supports the outer ring surface; the inner edge of the protrusion and the inner edge are connected by an arc-shaped structure.

[0015] A high-voltage DC contactor comprising the coil assembly described in any one of the above descriptions.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention, while wrapping the coil with tape, also forms a seal by filling the end face with epoxy resin, effectively improving and ensuring the insulation effect of the coil assembly. At the same time, it facilitates the assembly and molding of the coil assembly. It has a simple structure, is easy to operate, reliable in use, and has good practicality. It is especially suitable for occasions with high insulation requirements for both high-voltage and low-voltage control circuits. This utility model also has the following advantages: By setting the ring ribs on the outer end face of the end plate, a space for filling and accommodating epoxy resin is formed between the ring ribs and the shell. This not only facilitates the smooth flow and filling of epoxy resin, but also limits the reasonable flow space of epoxy resin, effectively meeting the filling and sealing requirements between the skeleton and the shell on the end face, and also improving and ensuring the structural strength of the skeleton.

[0017] By setting the chamfered structure on the two edges of the end plate, combined with the beveled end of the convex ridge, the epoxy resin can flow smoothly at the junction of the skeleton and the shell to achieve filling and sealing. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the present invention.

[0019] Figure 2 This is a schematic diagram of the assembly of the outer shell and frame of this utility model.

[0020] Figure 3 for Figure 2 A sectional view.

[0021] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0022] Figure 5 This is a schematic diagram of the skeleton of this utility model.

[0023] The components include: 1. Outer shell; 2. Circumferential space; 3. Adhesive tape; 4. Enamelled wire; 5. Skeleton; 6. Lead wire; 11. Outer convex shell; 12. Folded edge; 13. Protrusion; 14. Inner edge; 50. Inner cylinder; 51. Lead wire seat; 52. Inner annular surface; 53. Outer annular surface; 54. Ring rib; 55. Protruding ridge; 56. Straight edge; 57. Inclined surface; 58. Extension rib; 59. Chamfered structure; 501. End plate one; 502. End plate two. Detailed Implementation

[0024] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, a coil assembly in this embodiment includes a housing 1, a frame 5 mounted axially on the housing 1, an enameled wire 4 wound around the frame 5 inside the housing 1 to form a coil, and tape 3 wrapped around the outer circumferential wall of the enameled wire 4; the frame 5 includes an inner cylinder 50, and two ends of the inner cylinder 50 extend circumferentially to form an end plate 1 501 and an end plate 2 502, respectively. The end plate 1 501 is centered and mounted with the housing 1, and a gap is provided between the end plate 2 502 and the inner wall of the housing 1. A circumferentially arranged ring rib 54 is provided on the outer end face of the end plate 2 502, and epoxy resin is filled between the ring rib 54 on the outer end face of the end plate 2 502 and the inner wall of the housing 1.

[0026] In this embodiment, while the coil is wrapped with tape 3, the end face is filled with epoxy resin to form a seal, which effectively improves and ensures the insulation effect of the coil assembly, while also facilitating the assembly and molding of the coil assembly.

[0027] In this embodiment, by setting the annular rib 54 on the outer end face of the end plate 2 502, a space for filling and accommodating epoxy resin is formed between the annular rib 54 and the outer shell 1. This not only facilitates the smooth flow and filling of epoxy resin, but also limits the reasonable flow space of epoxy resin, effectively meeting the filling and sealing requirements between the skeleton 5 and the outer shell 1 on the end face, and also improving and ensuring the structural strength of the skeleton 5.

[0028] In this embodiment, the end plate 501 at one end of the skeleton 5 is centered and fitted with the outer shell 1, while the end plate 502 at the other end of the skeleton 5 is provided with a gap between it and the outer shell 1. This effectively ensures the accuracy of the installation position of the skeleton 5 relative to the outer shell 1 and ensures concentric arrangement, while facilitating the assembly of the skeleton 5 with the coil wound into the outer shell 1.

[0029] like Figure 5 As shown, the inner cylinder 50 extends out of the end plate 502 and is arranged concentrically with the ring rib 54 to form an inner and outer double-layer rib structure. The double-layer rib structure is connected radially by a protruding rib 55. The protruding rib 55 extends outward from the ring rib 54 and the end of the protruding rib 55 extending to the edge of the end plate 502 is provided with a bevel 57.

[0030] In this embodiment, the inner and outer double-layer rib structure combined with the protruding rib 55 effectively ensures the structural strength of the skeleton 5 at the end plate 502, and ensures the reliable application and filling of epoxy resin on the end face of the end plate 502.

[0031] End plate 2 502 has a circular structure that conforms to the inner wall of the outer shell 1. The radial edge of the circular structure fits and conforms to the inner wall of the outer shell 1. The wall of the outer shell 1 protrudes outward from end plate 2 502 in the axial direction. The outer end face edge of end plate 2 502 is provided with a chamfer structure 59.

[0032] In this embodiment, the circular structure of end plate 502 is conformally adapted to the inner wall surface of the outer shell 1, for example, by using tolerance differences to form a transition fit, which helps to ensure that the frame 5 is installed reliably and consistently relative to the outer shell 1.

[0033] In this embodiment, the wall of the outer shell 1 protrudes outward from the end plate 502 in the axial direction, so that the outer shell 1 and the annular ribs 54 on the end plate 502 can form an accommodating space for epoxy resin to be filled and can be filled to a preset depth, effectively ensuring the filling and sealing effect of epoxy resin.

[0034] In this embodiment, by setting the chamfered structure 59 at the edge of the end plate 2 502, combined with the setting of the inclined surface 57 at the end of the protruding rib 55, the epoxy resin can flow smoothly at the junction of the skeleton 5 and the outer shell 1 to achieve filling and sealing.

[0035] End plate 2 502 is evenly recessed along its circumferential edge to form a straight edge 56, and a gap is formed between the straight edge 56 and the inner wall surface of the outer shell 1.

[0036] In this embodiment, by setting the straight edge 56, the mating area between the circular structure of the second end plate 502 and the outer shell 1 is reduced, which facilitates the installation of the frame 5 into the outer shell 1; at the same time, it does not affect the effective axial centering of the frame 5 relative to the outer shell 1 by the circular structure of the second end plate 502.

[0037] The outer shell 1 has a convex shell portion 11. Two convex shell portions 11 are arranged opposite each other along the diameter direction of the outer shell 1. A single convex shell portion 11 is arranged through the outer shell 1 along the axial direction. A gap is formed between the inner wall surface of the convex shell portion 11 and the end plate 502. Two straight edge portions 56 are located at the convex shell portion 11.

[0038] The outer end face of end plate 2 502 extends to form lead seat 51. The lead wire 6 from the coil is led outward through lead seat 51. Lead seat 51 extends toward the ring rib 54 to form extension rib 58. Extension rib 58 helps to ensure the structural strength of lead seat 51. Lead seat 51 is located at one of the convex shell parts 11.

[0039] The radial dimension of the tape 3 wrapped around the coil is smaller than the radial dimensions of end plate 1 501 and end plate 2 502. The outer wall of the tape 3 and the inner wall of the outer shell 1 form an annular space 2.

[0040] In actual operation, the epoxy resin filling the end face of end plate 2 502 may flow into the interior from the gap between end plate 2 502 and the outer shell 1. The small amount of epoxy resin flowing in will not affect the normal use of the coil assembly. The sealing between end plate 2 502 and the outer shell 1 can be guaranteed by the epoxy resin filling.

[0041] like Figure 3 and Figure 4 As shown, the outer end face of end plate 501 forms an inner ring surface 52 and an outer ring surface 53 from the inside to the outside with the inner cylinder 50 as the center. The inner ring surface 52 and the outer ring surface 53 form a step facing outward in the circumferential direction. The end of the outer shell 1 extends inward in the circumferential direction to form a folded edge 12. The inner edge 14 of the folded edge 12 is pressed against the step on the end face of end plate 501 of the frame 5, so as to realize the centering and fitting of the frame 5 with the outer shell 1 via end plate 501.

[0042] In this embodiment, the inner edge 14 of the folded edge 12 can be interference-fitted with the upper step of the end plate 501 to ensure the structural reliability of the frame 5 and the outer shell 1.

[0043] The inner side of the folded edge 12 extends to form a protrusion 13, which fits and supports the outer ring surface 53. The inner edge of the protrusion 13 and the inner edge 14 are connected by an arc-shaped structure, which helps to ensure reliable and consistent installation between the frame 5 and the outer shell 1.

[0044] This embodiment also proposes a high-voltage DC contactor, including the coil assembly of any one of the above.

[0045] This invention effectively improves and ensures the insulation effect of the coil assembly, while also facilitating the assembly and molding of the coil assembly. It has a simple structure, is easy to operate, reliable in use, and has good practicality. It is especially suitable for occasions where high insulation requirements are required for both high-voltage and low-voltage control circuits.

[0046] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0047] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A coil assembly, characterized in that: The shell (1) includes an outer shell (1), which is fitted with a frame (5) along the axial direction. The frame (5) located inside the shell (1) is wound with enameled wire (4) to form a coil. The outer circumferential wall of the enameled wire (4) is wrapped with tape (3). The frame (5) includes an inner cylinder (50). The two ends of the inner cylinder (50) extend in the circumferential direction to form end plate one (501) and end plate two (502). End plate one (501) is centered and fitted with the outer shell (1). There is a gap between end plate two (502) and the inner wall of the outer shell (1). The outer end face of end plate two (502) is provided with a ring rib (54) arranged in the circumferential direction. The ring rib (54) on the outer end face of end plate two (502) and the inner wall of the outer shell (1) are filled with epoxy resin.

2. A coil assembly as described in claim 1, characterized in that: The inner cylinder (50) extends out of the end plate two (502) and is arranged concentrically with the ring rib (54) to form an inner and outer double-layer rib structure. The double-layer rib structure is connected by a protruding rib (55) extending radially between the two layers of ribs. The protruding rib (55) extends outward from the ring rib (54), and the end of the protruding rib (55) extending to the edge of the end plate two (502) is provided with a bevel (57).

3. A coil assembly as described in claim 1, characterized in that: The end plate 2 (502) has a circular structure that conforms to the inner wall of the outer shell (1). The radial edge of the circular structure is adapted to fit the inner wall of the outer shell (1). The wall of the outer shell (1) protrudes outward from the end plate 2 (502) in the axial direction. The outer end face edge of the end plate 2 (502) is provided with a chamfer structure (59).

4. A coil assembly as described in claim 3, characterized in that: The end plate 2 (502) is evenly recessed along the circumferential edge to form a straight edge (56), and a gap is formed between the straight edge (56) and the inner wall surface of the outer shell (1).

5. A coil assembly as described in claim 4, characterized in that: The outer shell (1) has a convex shell portion (11) formed by the outer shell protrusion. Two convex shell portions (11) are arranged opposite each other along the diameter direction of the outer shell (1). A single convex shell portion (11) is arranged through the outer shell (1) along the axial direction. A gap is formed between the inner wall surface of the convex shell portion (11) and the end plate (502). Two straight edge portions (56) are located at the convex shell portion (11).

6. A coil assembly as described in claim 5, characterized in that: The outer end face of the second end plate (502) extends to form a lead seat (51), and the lead wire (6) drawn from the coil is led outward through the lead seat (51). The lead seat (51) extends toward the ring rib (54) to form an extension rib (58). The lead seat (51) is located at one of the convex shell parts (11).

7. A coil assembly as described in claim 1, characterized in that: The radial dimension of the tape (3) wrapped around the coil is smaller than that of end plate one (501) and end plate two (502). The outer wall of the tape (3) and the inner wall of the outer shell (1) form a circumferential space (2).

8. A coil assembly as described in claim 1, characterized in that: The outer end face of the end plate (501) forms an inner ring surface (52) and an outer ring surface (53) from the inside to the outside with the inner cylinder (50) as the center. The inner ring surface (52) and the outer ring surface (53) form a step facing outward in the circumferential direction. The end of the outer shell (1) extends inward in the circumferential direction to form a folded edge (12). The inner edge (14) of the folded edge (12) is pressed against the step of the end face of the end plate (501) of the skeleton (5).

9. A coil assembly as described in claim 8, characterized in that: The inner side of the folded edge (12) extends to form a protrusion (13), which is supported by the outer ring surface (53); the inner edge of the protrusion (13) and the inner edge (14) are connected by an arc-shaped structure.

10. A high-voltage DC contactor, characterized in that: The coil assembly includes any one of claims 1-9.

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