Coil assembly and relay

Abstract

The utility model relates to a coil assembly and a relay. The coil assembly comprises a coil winding, an iron core and a coil frame. The iron core comprises a main body and two support arms which are respectively connected to two ends of the main body in a first direction; the coil frame is an insulator and comprises a winding body and two flanges arranged at the two ends of the winding body in the first direction respectively, enameled wires of the coil winding are wound on the periphery of the winding body, each flange comprises a flange body and a first retaining wall, the flange bodies are connected with the winding body, one end of each first retaining wall protrudes out of the corresponding flange body in the second direction, and the other end of each first retaining wall protrudes out of the corresponding flange body. The main body is arranged inside the winding body, the two supporting arms correspond to the flanges one to one, the ends, away from the main body, of the supporting arms penetrate out of the flange bodies of the corresponding flanges and protrude out of the sides, provided with the first retaining walls, of the flange bodies, and the first retaining walls are arranged on the sides, facing the winding body, of the supporting arms at intervals; and a groove is concavely formed in the part, between the support arm and the first retaining wall, of the flange body. The coil assembly is good in insulation performance, and the miniaturization design of the relay is facilitated.

Description

Technical Field

[0001] This application relates to the field of electronic control device technology, and in particular to a coil assembly and a relay. Background Technology

[0002] Some relays have a base portion that includes a coil assembly and a stationary contact that is injection molded together with the coil assembly. The coil assembly includes a coil frame, an iron core, and a coil winding. The coil frame includes a winding body and two flanges respectively disposed at opposite ends of the winding body. The iron core has a U-shaped structure and includes a main body and two support arms protruding from both ends of the main body. The two support arms correspond one-to-one with the two flanges. The main body is injection molded inside the winding body. The two support arms extend from the top of their corresponding flanges outside the coil frame. The ends of the support arms away from the main body (i.e., the tops of the support arms) are the pole surfaces that contact the moving contact of the relay. The enameled wire of the coil winding is wound around the outer periphery of the winding body.

[0003] However, the coil assembly in the related technology has the following shortcomings: due to the limited space inside the relay, the creepage distance from the iron core to the coil winding is small, resulting in poor insulation withstand voltage performance of the coil assembly. Utility Model Content

[0004] Therefore, it is necessary to provide a coil assembly and a relay to address the above problems. The coil assembly has good insulation performance, which is beneficial for the miniaturization design of the relay.

[0005] A coil assembly, comprising:

[0006] A coil winding, wherein the coil assembly includes enameled wire;

[0007] The iron core includes a main body and two support arms respectively connected to both ends of the main body in a first direction;

[0008] A coil frame, which is an insulator, includes a winding body and two flanges respectively disposed at both ends of the winding body in a first direction. The enameled wire is wound around the outer periphery of the winding body. Each flange includes a flange body and a first retaining wall connected to the flange body. The flange body is connected to the winding body. One end of the first retaining wall protrudes from the flange body in a second direction. The main body is disposed inside the winding body. Two support arms correspond one-to-one with the flanges. The end of each support arm away from the main body passes through the flange body of the corresponding flange and protrudes from the side of the flange body with the first retaining wall. The first retaining walls are spaced apart on the side of the support arm facing the winding body. The flange body is recessed with a groove at the portion between the support arm and the first retaining wall. The second direction is perpendicular to the first direction.

[0009] In one embodiment, the first retaining wall is provided with a first stop surface and a second stop surface connected to the first stop surface on the side facing the support arm. The end of the first stop surface away from the second stop surface is connected to the flange body, and the second stop surface is inclined from the first stop surface toward the winding body.

[0010] In one embodiment, the length of the groove extends along a third direction, and the groove has a first wall surface and a second wall surface connected to the first wall surface on both walls in the third direction. The first wall surface is close to the bottom of the groove and is perpendicular to the bottom of the groove. The second wall surface is close to the opening of the groove and gradually slopes from the opening towards the bottom of the groove towards the interior of the groove.

[0011] In one embodiment, the flange further includes a second retaining wall disposed on the flange body, one end of the second retaining wall protruding from the flange body along the second direction, and the second retaining wall and the first retaining wall both protruding from the same side of the flange body, the second retaining wall and the first retaining wall being spaced apart along the first direction, and the support arm being disposed on the side of the second retaining wall facing the first retaining wall.

[0012] In one embodiment, the second retaining wall includes two retaining wall bodies and a retaining wall protrusion connected between the two retaining wall bodies. The two retaining wall bodies are respectively distributed along the third direction, and the retaining wall bodies are spaced apart from and opposite to the first retaining wall along the first direction. The retaining wall protrusion protrudes from the side of the retaining wall body away from the first retaining wall along the first direction, and the retaining wall protrusion respectively wraps around the support arm on both sides of the third direction and the side of the support arm away from the first retaining wall.

[0013] In one embodiment, the coil winding further includes two coil ends, with the opposite ends of the enameled wire respectively disposed on the coil ends and electrically connected to the coil ends, and the two coil ends respectively disposed on both sides of the flange body in the third direction.

[0014] In one embodiment, the coil winding further includes two conductive leads for connecting to external coil pins, each of which corresponds to one of the two coil winding ends. The conductive leads are electrically connected to their corresponding coil winding ends. The flange body has recesses formed on the three opposite sides of the retaining wall protrusion, with the recesses located on the side of the flange body away from the winding body. The two conductive leads correspond one-to-one with the recesses on the flange body, and one end of the conductive lead away from the flange body protrudes into the recess.

[0015] In one embodiment, the arm has a planar structure on both sides in the third direction.

[0016] In one embodiment, along the second direction, a positioning hole is provided on the side of the flange body opposite to the first retaining wall, and the positioning hole extends along the second direction to the side of the body.

[0017] In one embodiment, the flange further includes a third retaining wall disposed on the flange body. Along the second direction, the third retaining wall is located on the side of the flange body opposite to the first retaining wall, and the third retaining wall protrudes from one side of the winding body. The third retaining wall and the positioning hole are arranged sequentially along the first direction, and the positioning hole is located on the side of the third retaining wall opposite to the winding body.

[0018] On the other hand, a relay is also provided, including the coil assembly of any of the above.

[0019] In the aforementioned coil assembly, enameled wire is wound around the outer periphery of the winding body. Since the first retaining wall is spaced apart on the side of the iron core support arm facing the winding body, the first retaining wall can form an insulating barrier between the enameled wire on the winding body and the support arm. In addition, a groove is provided in the part of the flange body located between the support arm and the first retaining wall. The groove effectively extends the creepage distance between the support arm and the enameled wire on the winding body. In this way, with the cooperation of the first retaining wall and the groove, the risk of electrical conduction between the support arm and the enameled wire on the winding body can be effectively reduced without increasing the overall size of the coil assembly. This improves the insulation between the coil winding and the iron core, thereby improving the overall insulation performance of the coil assembly and facilitating the miniaturization design of the relay. Attached Figure Description

[0020] Figure 1 This is a perspective view of the coil assembly in some embodiments of this application.

[0021] Figure 2 This is a structural diagram of the coil assembly after the enameled wire on the winding body is removed in some embodiments of this application.

[0022] Figure 3 for Figure 2 A cross-sectional view along the AA direction.

[0023] Figure 4 for Figure 2 A cross-sectional view along the BB direction.

[0024] Figure 5 This is a perspective view of the iron core in some embodiments of this application.

[0025] In the picture:

[0026] 1. Coil frame; 11. Winding body; 12. Flange; 121. Flange body; 1211. Groove; 1212. First wall surface; 1213. Second wall surface; 1214. Recess; 122. First retaining wall; 1221. First retaining surface; 1222. Second retaining surface; 123. Second retaining wall; 1231. Retaining wall body; 1232. Retaining wall protrusion; 124. Third retaining wall; 125. Positioning hole; 2. Iron core; 21. Main body; 22. Support arm; 3. Coil winding; 31. Enamelled wire; 32. Coil winding head; 33. Conductive lead-out piece. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0028] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0029] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0033] One embodiment of this application provides a relay, which includes a coil assembly, a moving contact, and a stationary contact. The stationary contact is fixed to the coil assembly, and the coil assembly is used to drive the moving contact to move so that the moving contact contacts or separates from the stationary contact.

[0034] See Figure 1 , Figure 1 A perspective view of the coil assembly in some embodiments of this application is shown; Figure 2 The diagram shows the structure of the coil assembly after the enameled wire on the winding body is removed in some embodiments of this application. Figure 3 It shows Figure 2 A cross-sectional view along the AA direction. The coil assembly includes a coil winding 3, an iron core 2, and a coil frame 1. The coil winding 3 includes enameled wire 31. (Combined...) Figure 5 , Figure 5A perspective view of the iron core 2 is shown in some embodiments of this application. The iron core 2 includes a main body 21 and two support arms 22 respectively connected to the two ends of the main body 21 in a first direction. The support arms 22 form an angle with the main body 21. The coil frame 1 is an insulator, and the coil frame 1 and the iron core 2 are injection molded together. The coil frame 1 includes a winding body 11 and two flanges 12 respectively disposed at both ends of the winding body 11 in a first direction. Enamelled wire 31 is wound around the outer periphery of the winding body 11. The flange 12 includes a flange body 121 and a first retaining wall 122 connected to the flange body 121. The flange body 121 is connected to the winding body 11. One end of the first retaining wall 122 protrudes from the flange body 121 in a second direction. The main body 21 is disposed inside the winding body 11. Two support arms 22 correspond one-to-one with the flanges 12. The end of the support arm 22 away from the main body 21 passes through the flange body 121 of the corresponding flange 12 and protrudes from the side of the flange body 121 with the first retaining wall 122. The first retaining walls 122 are spaced apart on the side of the support arm 22 facing the winding body 11. The flange body 121 located between the support arm 22 and the first retaining wall 122 has a recessed groove 1211. The second direction is perpendicular to the first direction. It is understood that the end of the support arm 22 away from the main body 21 is the pole surface for attracting the moving contact. In this application, the first direction is the length direction of the coil assembly, that is, the direction indicated by the X arrow in the figure; the second direction is the height direction of the coil, that is, the direction indicated by the Z arrow in the figure.

[0035] In this type of coil assembly, enameled wire 31 is wound around the outer periphery of the winding body 11. Since the first baffle 122 is spaced apart on the side of the support arm 22 of the iron core 2 facing the winding body 11, the first baffle 122 can form an insulating barrier between the enameled wire 31 on the winding body 11 and the support arm 22. In addition, a groove 1211 is provided in the part of the flange body 121 located between the support arm 22 and the first baffle 122. The groove 1211 effectively extends the creepage distance between the support arm 22 and the enameled wire 31 on the winding body 11. In this way, with the cooperation of the first baffle 122 and the groove 1211, the risk of electrical conduction between the support arm 22 and the enameled wire 31 on the winding body 11 can be effectively reduced without increasing the overall size of the coil assembly. This can improve the insulation between the coil winding 3 and the iron core 2, and improve the overall insulation performance of the coil assembly, which is beneficial to the miniaturization design of the relay.

[0036] See Figure 3The first retaining wall 122 has a first stop surface 1221 and a second stop surface 1222 connected to the first stop surface 1221 on the side facing the support arm 22. The end of the first stop surface 1221 away from the second stop surface 1222 is connected to the flange body 121, and the second stop surface 1222 is inclined from the first stop surface 1221 toward the winding body 11. The inclined second stop surface 1222 on the first retaining wall 122 can effectively extend the creepage distance between the support arm 22 and the enameled wire 31 in a limited space, thereby further improving the insulation performance between the coil winding 3 and the iron core 2. In this embodiment, the first stop surface 1221 is perpendicular to the flange body 121, so that the first stop surface 1221 and the flange body 121 form a stepped structure. Of course, in other embodiments, the included angle between the first stop surface 1221 and the flange body 121 can be flexibly adjusted as needed. There is no specific limitation on the included angle between the first stop surface 1221 and the flange body 121 here.

[0037] In some embodiments, the coil winding 3 further includes two coil ends 32, with the opposite ends of the enameled wire 31 connected to the two coil ends 32 respectively. The two coil ends 32 protrude from the flange body 121 on both sides in a third direction. In this application, the third direction is the width direction of the coil assembly, i.e., the direction indicated by the Y arrow in the figure. The coil ends 32 are conductors, and the two ends of the enameled wire 31 are wound around the two coil ends 32 and electrically connected to them. The coil ends 32 provide a fixing function for the enameled wire 31. By having the two coil ends 32 protrude from the flange body 121 on both sides in a third direction, the coil ends 32 are reasonably arranged within the limited space of the coil assembly, which helps to improve the compactness of the various components of the coil assembly and minimizes the electrical conductivity between the coil ends 32 and the support arm 22.

[0038] See Figure 2 and Figure 4 , Figure 4 It shows Figure 2A cross-sectional view along the BB direction. The length of the groove 1211 extends along the third direction. Both groove walls of the groove 1211 in the third direction are provided with a first wall surface 1212 and a second wall surface 1213 connected to the first wall surface 1212. The first wall surface 1212 is close to the bottom of the groove 1211 and is perpendicular to the bottom of the groove 1211. The second wall surface 1213 is close to the opening of the groove 1211 and gradually slopes from the opening to the bottom towards the interior of the groove 1211. The bottom of the vertical groove 1211 on the first wall surface 1212 is set so that the first wall surface 1212 and the bottom of the groove 1211 form a stepped structure. Through the stepped structure and the inclined setting of the second wall surface 1213, the creepage distance between the support arm 22 and the coil winding head 32 is effectively extended in the limited space. In actual implementation, the length of the first wall surface 1212 and the second wall surface 1213 can be adjusted as needed, so that the creepage distance between the support arm 22 and the coil winding head 32 can be set to be close to the creepage distance between the support arm 22 and the enameled wire 31 on the winding body 11, so as to prevent the local creepage distance between the iron core 2 and the coil winding 3 from being too small and affecting the insulation performance between the coil winding 3 and the iron core 2.

[0039] See Figure 1 The flange 12 also includes a second retaining wall 123 disposed on the flange body 121. One end of the second retaining wall 123 protrudes from the flange body 121 along a second direction, and both the second retaining wall 123 and the first retaining wall 122 protrude from the same side of the flange body 121. The second retaining wall 123 and the first retaining wall 122 are spaced apart along a first direction, and the support arm 22 is disposed on the side of the second retaining wall 123 facing the first retaining wall 122. The second retaining wall 123 serves two purposes: firstly, it forms a protruding structure between the coil winding head 32 and the support arm 22, further extending the creepage distance from the support arm 22 to the coil winding head 32; secondly, it enhances the overall structural strength of the flange 12, and the second retaining wall 123 and the flange body 121 work together to fix the support arm 22, improving the bonding force between the core 2 and the flange 12.

[0040] The second retaining wall 123 includes two retaining wall bodies 1231 and a retaining wall protrusion 1232 connecting the two retaining wall bodies 1231. The two retaining wall bodies 1231 are distributed along a third direction, and the retaining wall bodies 1231 and the first retaining wall 122 are spaced apart and opposite each other along a first direction. The retaining wall protrusion 1232 protrudes from the retaining wall body 1231 on the side away from the first retaining wall 122 along the first direction. The retaining wall protrusion 1232 wraps around the support arm 22 on both sides of the third direction and the side of the support arm 22 away from the first retaining wall 122. In this way, the retaining wall protrusion 1232 wraps around the three sides of the support arm 22, which helps to increase the contact area between the flange 12 and the iron core 2 and prevents the iron core 2 from loosening in the coil frame 1. In addition, the interaction between the retaining wall protrusion 1232 and the retaining wall body 1231 ensures a sufficiently long creepage distance between the support arm 22 and the coil winding head 32.

[0041] It is understood that the relay includes two coil pins (not shown in the figure) and a power supply device (not shown in the figure) that supplies power to the coil assembly. The power supply device is connected to the coil assembly through the two coil pins for easy connection between the coil assembly and the power supply device. The coil winding 3 also includes two conductive leads 33 for connecting to the coil pins. In actual implementation, the conductive leads 33 are soldered to the coil pins, or the conductive leads 33 are integrally formed with the coil pins, providing a fixing function for the coil pins. The two conductive leads 33 correspond one-to-one with the two coil winding heads 32, and the conductive leads 33 are electrically connected to their corresponding coil winding heads 32. In this embodiment, the flange body 121 has recesses 1214 formed on the two opposite sides of the retaining wall protrusion 1232. The recesses 1214 are located on the side of the flange body 121 away from the winding body 11. Two conductive lead-out pieces 33 correspond one-to-one with the recesses 1214 on the flange body 121. The end of the conductive lead-out piece 33 away from the flange body 121 protrudes into the recess 1214. On the flange body 121, recesses 1214 are formed on both sides of the retaining wall protrusion 1232 in the third direction opposite to each other. The recesses 1214 provide space for the conductive lead 33 to be accommodated. The blocking of the retaining wall protrusion 1232 can extend the creepage distance from the support arm 22 to the conductive lead 33. In actual implementation, the height of the second retaining wall 123 protruding from the flange body 121 in the second direction can be adjusted as needed so that the creepage distance from the support arm 22 to the conductive lead 33 is close to the creepage distance from the support arm 22 to the enameled wire 31 on the winding body 11. This can reduce the risk of local electrical conduction between the iron core 2 and the coil winding 3 due to the creepage distance between the support arm 22 and the conductive lead 33 being too small, thereby giving the iron core 2 and the coil winding 3 good insulation performance.

[0042] See Figure 5The support arm 22 has a planar structure on both sides in the third direction. In this embodiment, the third direction is the width direction of the coil assembly. The width direction of the iron core 2 is the same as the width direction of the coil assembly. That is, the support arm 22 has a planar structure on both sides in the width direction of the iron core 2. This structure of the iron core 2 can make the support arm 22 without protruding structures on both sides in the width direction, which is conducive to reducing the overall width of the iron core 2. In this way, the physical distance between the iron core 2 and the conductive lead 33 can be increased within the limited space in the relay. This is conducive to extending the creepage distance between the support arm 22 and the conductive lead 33 (i.e., from the iron core 2 to the conductive lead 33). In addition, since the support arm 22 has no protruding structures on both sides in the width direction, the parts on the iron core 2 that require size control can be reduced in actual implementation, which is conducive to reducing the manufacturing cost of the coil assembly.

[0043] In actual implementation, the coil frame 1 and the iron core 2 are integrally injection molded. In order to facilitate the fixing of the iron core 2 in the coil frame 1 and improve the installation accuracy of the iron core 2 in the coil frame 1, in this embodiment, a positioning hole 125 is provided on the side of the flange body 121 away from the first retaining wall 122 along the second direction. The positioning hole 125 extends along the second direction to the side of the body 21. In this way, when the coil frame 1 is injection molded, the injection mold can use the positioning member to insert into the positioning hole 125 to position the iron core 2, thereby accurately positioning the iron core 2 inside the coil frame 1.

[0044] See Figure 1 and Figure 3 The flange 12 also includes a third baffle 124 disposed on the flange body 121. Along the second direction, the third baffle 124 is located on the side of the flange body 121 away from the first baffle 122, and the third baffle 124 protrudes from one side of the winding body 11. The third baffle 124 and the positioning hole 125 are arranged sequentially along the first direction, and the positioning hole 125 is located on the side of the third baffle 124 away from the winding body 11. The third baffle 124 can form an insulating barrier between the positioning hole 125 and the winding body 11, which helps to extend the creepage distance from the part of the main body 21 facing the positioning hole 125 to the enameled wire 31 on the winding body 11, thereby preventing the main body 21 from creeping through the hole wall of the positioning hole 125 to the enameled wire 31 on the winding body 11, and improving the insulation performance between the iron core 2 and the coil winding 3. In actual implementation, the height of the third retaining wall 124 protruding from the winding body 11 can be adjusted, and the creepage distance from the part of the main body 21 facing the positioning hole 125 to the enameled wire 31 on the winding body 11 can be adjusted. This allows the creepage distance from the part of the main body 21 facing the positioning hole 125 to the enameled wire 31 on the winding body 11 to be close to the creepage distance from the support arm 22 to the enameled wire 31 on the winding body 11. While ensuring the compactness of each component in the coil assembly, this reduces the risk of partial electrical conduction between the coil winding 3 and the iron core 2, and improves the insulation performance between the iron core 2 and the coil winding 3.

[0045] In this type of relay, by rationally arranging the various components in the coil assembly, the components in the coil assembly are made more compact, and the insulation performance between the iron core 2 and the coil winding 3 is effectively improved, which is conducive to the miniaturization design of the relay.

[0046] It should be noted that the above-mentioned coil assembly is not limited to use in relays, but can also be flexibly applied to other devices as needed. There are no specific restrictions on the devices in which the coil assembly can be applied.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A coil assembly, characterized by, The application relates to a coil assembly. The coil assembly comprises a coil winding, a coil assembly including an enameled wire, a core including a main body and two branch arms respectively connected to the main body at two ends in a first direction, a coil holder being an insulator, the coil holder including a winding body and two flanges respectively arranged at two ends of the winding body in the first direction, an outer periphery of the winding body being provided with the enameled wire, the flange including a flange body and a first barrier wall connected to the flange body, the flange body being connected to the winding body, one end of the first barrier wall being protruded from the flange body in a second direction, the main body being arranged inside the winding body, the two branch arms corresponding to the flanges respectively, one end of the branch arm away from the main body being protruded from the flange body of the corresponding flange and protruded from the flange body with the first barrier wall on one side, the first barrier wall being arranged on one side of the branch arm towards the winding body, a recess being arranged in a part of the flange body between the branch arm and the first barrier wall. The first barrier wall is provided with a first barrier surface and a second barrier surface connected to the first barrier surface on one side of the branch arm respectively, one end of the first barrier surface away from the second barrier surface being connected to the flange body, the second barrier surface being inclined from the first barrier surface to the winding body. The length of the recess extends along a third direction, both groove walls of the recess in the third direction are provided with a first wall surface and a second wall surface connected to the first wall surface, the first wall surface being close to the groove bottom of the recess, and the first wall surface being perpendicular to the groove bottom of the recess, the second wall surface being close to the groove opening of the recess, and the second wall surface being gradually inclined from the groove opening to the groove bottom towards the inside of the recess.

2. The coil assembly of claim 1, wherein, The flange further comprises a second barrier wall arranged on the flange body, one end of the second barrier wall being protruded from the flange body in the second direction, and the second barrier wall and the first barrier wall are both protruded from the same side of the flange body, the second barrier wall and the first barrier wall are spaced apart along the first direction, and the branch arm is arranged on one side of the second barrier wall towards the first barrier wall.

3. The coil assembly of claim 1, wherein, The second barrier wall comprises two barrier wall bodies and a barrier wall protruding part connected between the two barrier wall bodies, the two barrier wall bodies are distributed along the third direction respectively, and the barrier wall bodies are spaced apart and opposite to the first barrier wall along the first direction, the barrier wall protruding part is protruded from the barrier wall body away from the side of the first barrier wall along the first direction, and the barrier wall protruding part wraps the branch arm on both sides in the third direction and on the side away from the first barrier wall respectively.

4. The coil assembly of claim 3, wherein, The coil winding further comprises two coil winding heads, opposite ends of the enameled wire are arranged on the coil winding heads and electrically connected to the coil winding heads respectively, and the two coil winding heads are arranged on both sides of the flange body in the third direction respectively.

5. The coil assembly of claim 4, wherein, ​ 6. The coil assembly of claim 5, wherein, ​ 7. The coil assembly of claim 6, wherein, The coil winding further comprises two conductive lead-out sheets for connecting with external coil pins, respectively, and the two conductive lead-out sheets correspond to the two coil winding heads one by one, the conductive lead-out sheet is electrically connected with the corresponding coil winding head, the flange body is provided with a recess on the side away from the winding body, and the two conductive lead-out sheets correspond to the recess on the flange body one by one, and one end of the conductive lead-out sheet away from the flange body protrudes in the recess.

8. The coil assembly of claim 3, wherein, The branch arm is in a planar structure on both sides of the third direction.

9. The coil assembly of any one of claims 1 to 7, wherein, Along the second direction, the side of the flange body away from the first barrier wall is provided with a positioning hole, and the positioning hole extends along the second direction to one side of the main body.

10. The coil assembly of claim 9, wherein, The flange further comprises a third barrier wall provided on the flange body, along the second direction, the third barrier wall is located on the side of the flange body away from the first barrier wall, and the third barrier wall protrudes from one side of the winding body, the third barrier wall and the positioning hole are sequentially arranged along the first direction, and the positioning hole is located on the side of the third barrier wall away from the winding body.

11. A relay characterized by comprising: The coil assembly comprises the coil assembly according to any one of claims 1 to 10.

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