Coil component and low-voltage electric appliance with same

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses a coil assembly and a low-voltage electric appliance with the same. The coil assembly comprises a conductive piece, a connecting piece and a coil. The conductive piece is provided with a through connecting hole. The connecting piece penetrates through the connecting hole and is partially located outside the connecting hole. And the coil is welded with the part of the connecting piece outside the connecting hole. The connecting piece is made of a welding material, so that additional welding brazing filler metal is not needed in the welding process, compared with a mode of welding the coil and the conductive piece through a welding piece, the production efficiency is improved, and the welding position of the conductive piece and the coil is conveniently positioned through the arrangement of the connecting hole. The connecting holes without the connecting pieces are through holes and can be quickly identified on an automatic production line, so that the conductive pieces without the connecting pieces are separated, the problem of abnormal welding caused by the fact that soldering lug missing cannot be identified is effectively solved, the detectability of the product production process is improved, and the product reject ratio is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to low voltage electrical apparatus technical field especially relates to a coil assembly and have coil assembly's low voltage electrical apparatus. BACKGROUND

[0002] The coil in the low voltage electrical apparatus such as starter, circuit breaker is connected with the conductive part such as connecting plate, support, forms coil assembly, realizes overload breaking protection switch electrical apparatus and circuit, and on-off circuit function, and the quality of coil assembly is directly related to the serviceability of starter, circuit breaker and other low voltage electrical apparatus.

[0003] In the manufacture of coil assembly of starter, circuit breaker and other low voltage electrical apparatus, the prior art has the following preparation mode. One is to stamp out the welding piece first, and the welding piece is used as a transition material to weld the connecting coil and the conductive part, which has the problems of low production efficiency and inaccurate welding position. Another is to use the pre-riveting and pressing welding piece on the surface of the conductive part to weld the connecting coil and the conductive part. However, in the preparation mode of pre-riveting and pressing welding piece, when welding the coil and the conductive part, the welding piece cannot be effectively identified, which leads to abnormal welding between the coil and the conductive part, and cannot form a qualified coil assembly.

[0004] In summary, the existing coil assembly has the problems of low production efficiency, low welding positioning accuracy, and cannot effectively identify the welding piece missing to cause abnormal welding during preparation. Therefore, there is an urgent need for a coil assembly and a low voltage electrical apparatus with the coil assembly to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a coil assembly and a low voltage electrical apparatus with the coil assembly, which can improve the production efficiency and production quality of the coil assembly, reduce abnormal phenomena in the production process, and realize stable and high-quality production of the coil assembly.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] In the first aspect, a coil assembly is provided, comprising:

[0008] A conductive part, a connecting hole is provided through the conductive part;

[0009] A connecting piece, the material of the connecting piece is welding material; the connecting piece is connected to the connecting hole, and part of the connecting piece is located outside the connecting hole;

[0010] A coil, the coil is welded to the part of the connecting piece located outside the connecting hole.

[0011] As an optional scheme of the coil assembly provided by the utility model, the connecting piece comprises a penetrating part and a welding part.

[0012] The penetrating portion is penetrated in the connecting hole, one end of the penetrating portion is used for riveting to form the welding portion under the action of external force; the welding portion is located outside the connecting hole and abuts against the conductive piece; and the welding portion is welded with the coil.

[0013] As an optional scheme of the coil assembly provided by the present application, the connecting piece further comprises a stop portion, the stop portion and the welding portion are arranged at two ends of the penetrating portion, the stop portion is located outside the connecting hole and abuts against the conductive piece.

[0014] As an optional scheme of the coil assembly provided by the present application, the cross section of the connecting hole is circular, elliptical or polygonal.

[0015] As an optional scheme of the coil assembly provided by the present application, the material of the connecting piece is any one of pure copper, red copper, oxygen-free copper, iron bronze, brass, tin phosphorus bronze, copper alloy and dispersion reinforced copper-based material.

[0016] As an optional scheme of the coil assembly provided by the present application, the material of the conductive piece is any one of copper-clad steel, copper complex brass laminated composite material, copper complex stainless steel laminated composite material, copper complex aluminum laminated composite material, particle reinforced copper-based composite material and copper alloy.

[0017] As an optional scheme of the coil assembly provided by the present application, the coil comprises a spiral portion and a connecting portion, the connecting portion is connected to one end of the spiral portion and is welded with the connecting piece.

[0018] As an optional scheme of the coil assembly provided by the present application, the part of the connecting piece located outside the connecting hole is provided with a welding surface, the welding surface is welded with the coil, and at least one protruding structure is protruded on the welding surface.

[0019] As an optional scheme of the coil assembly provided by the present application, the protruding structure is a strip-shaped protrusion and is provided with a plurality of strip-shaped protrusions, the plurality of strip-shaped protrusions are distributed at intervals or the plurality of strip-shaped protrusions are distributed in a meshed manner.

[0020] Alternatively,

[0021] The protruding structure is a ring-shaped protrusion and is provided with a plurality of ring-shaped protrusions, the centers of the plurality of ring-shaped protrusions are distributed at intervals or the plurality of ring-shaped protrusions are distributed in a concentric circle manner.

[0022] Alternatively,

[0023] The protruding structure is a dot-shaped protrusion and is provided with a plurality of dot-shaped protrusions.

[0024] The plurality of dot-shaped protrusions are distributed at intervals; and / or the dot-shaped protrusion is a cylinder, a cone, a polygon or a sphere.

[0025] As an optional scheme of the coil assembly provided by the utility model, the connecting piece is covered with a silver layer.

[0026] In a second aspect, a low-voltage electrical appliance with a coil assembly is provided, comprising a housing and the coil assembly as described above, wherein the coil assembly is arranged in the housing.

[0027] The utility model has the advantages of:

[0028] The utility model provides a kind of coil assembly and the low-voltage electrical appliance with coil assembly, by pre-setting connecting hole on conducting part, and connecting piece prepared from welding material is arranged in connecting hole, when welding coil and connecting piece, it is not necessary to use additional welding filler to realize the welding connection of both, welding process is simplified, and compared with the mode of welding piece welding coil and conducting part, production efficiency is improved, to improve the production efficiency of the low-voltage electrical appliance with the coil assembly in turn.And, by setting connecting hole, it is convenient to position the installation position of connecting piece on conducting part, to accurately position the welding position of coil and conducting part, effectively improve positioning accuracy, ensure that the quality of coil assembly after welding is excellent.In addition, in the process of welding coil and connecting piece, if there is conducting part without connecting piece in connecting hole, then conducting part is through hole at the position to be welded at this time, it can be quickly identified by the equipment on automatic production line, so as to separate the conducting part, avoid that the conducting part is directly welded with coil without installing connecting piece, effectively solve the welding abnormal problem caused by the inability to identify the absence of welding piece, improve the detectability of coil assembly product production process, reduce the quality risk in coil assembly production process, conducive to mass production and improve the yield of product. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings needed to be used in the embodiments of the utility model will be briefly introduced as follows, and obviously, the drawings described below are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the drawings without creating labor.

[0030] Figure 1 It is the structure schematic view of the conducting part of the coil assembly provided by one of the embodiments of the utility model;

[0031] Figure 2 It is the schematic view of riveting assembly formed after riveting of conducting part and connecting piece provided by one of the embodiments of the utility model;

[0032] Figure 3 It is the structure schematic view of the coil assembly provided by one of the embodiments of the utility model;

[0033] Figure 4 is Figure 2 is a partial enlarged view of A in FIG.

[0034] Figure 5 is a plan view of a riveting assembly provided by one of the embodiments of the present application;

[0035] Figure 6 is Figure 5 is a partial enlarged view of B in FIG.

[0036] Figure 7 is a structural schematic view of the conductive member of the coil assembly provided by another embodiment of the present application;

[0037] Figure 8 is a schematic view of the riveting assembly formed after riveting of the conductive member and the connecting member provided by another embodiment of the present application;

[0038] Figure 9 is a sectional view of the riveting assembly after riveting of the conductive member and the connecting member provided by another embodiment of the present application;

[0039] Figure 10 is a structural schematic view of the coil assembly provided by another embodiment of the present application;

[0040] Figure 11 is a flow chart of the method for manufacturing the coil assembly provided by the embodiment of the present application.

[0041] in the figure:

[0042] 10, riveting assembly; 20, coil assembly;

[0043] 1, conductive member; 2, connecting member; 3, coil;

[0044] 11, first conductive plate; 12, second conductive plate;

[0045] 111, conductive plate segment;

[0046] 121, connecting hole;

[0047] 21, welding portion; 22, stop portion; 23, penetrating portion;

[0048] 211, welding surface; 212, protruding structure;

[0049] 31, spiral portion; 32, connecting portion. DETAILED DESCRIPTION

[0050] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are merely intended to explain the utility model, and not to limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0051] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0052] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0053] In the description of the embodiment, the terms "upper", "lower", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only used to distinguish in description, and have no special meaning.

[0054] In the embodiment, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which means that there are three kinds of situations, that is, A alone, A and B exist at the same time, and B alone. In addition, the character " / " in the utility model generally represents an "or" relationship between the front and rear associated objects.

[0055] In the embodiments of the utility model, the same reference signs represent the same parts, and for brevity, the detailed description of the same parts is omitted in different embodiments.

[0056] Embodiment one

[0057] As shown in Figure 1 , Figure 2 and Figure 3 , the embodiment provides a coil assembly 20, which can improve the production efficiency and quality of the coil assembly 20, reduce abnormal phenomena in the production process, and realize stable production of the coil assembly 20. The coil assembly 20 comprises a conductive part 1, a connecting part 2, and a coil 3.

[0058] As shown in Figure 1 , it is a structural schematic diagram of the conductive part 1 in one of the embodiments of the present application, and the connecting hole 121 is provided through the conductive part 1. As shown in Figure 2 , the connecting part 2 is connected through the connecting hole 121, and part of the connecting part 2 is located outside the connecting hole 121, so as to realize welding with the coil 3. As shown in Figure 3 , the coil 3 is welded with the part of the connecting part 2 located outside the connecting hole 121, and the welding forms the coil assembly 20.

[0059] As shown in Figure 7 , it is a structural schematic diagram of the conductive part 1 in another embodiment of the present application, as shown in Figure 8 and Figure 9 , it is a schematic diagram after the connecting part 2 is installed in the connecting hole 121 of the conductive part 1, as shown in Figure 10 , it is a schematic diagram of the coil assembly 20 formed after the coil 3 is welded with the connecting part 2 in this embodiment.

[0060] In the coil assembly 20 provided by the embodiment of the present application, the connecting hole 121 is provided in advance on the conductive part 1, and the connecting part 2 made of welding material is connected through the connecting hole 121. When the coil 3 is welded with the connecting part 2, no additional welding filler is needed to realize the welding connection of the two, the welding process is simplified, and compared with the way of welding the coil 3 and the conductive part 1 through the welding sheet, the production efficiency is improved, and thus the production efficiency of the low-voltage electrical appliance with the coil assembly 20 can be improved. Moreover, by providing the connecting hole 121, the installation position of the connecting part 2 on the conductive part 1 is facilitated, and thus the welding position of the coil 3 and the conductive part 1 can be accurately positioned, the positioning accuracy is effectively improved, and the quality of the coil assembly 20 after welding is ensured to be excellent.

[0061] In addition, in the process of welding the coil 3 and the connecting piece 2, if there is a conductive piece 1 without the connecting piece 2 installed in the connecting hole 121, at this time, the conductive piece 1 is a through hole at the position to be welded, which can be quickly identified by the equipment on the automatic production line, so as to separate the conductive piece 1, avoid the direct welding of the conductive piece 1 and the coil 3 without the connecting piece 2 installed, effectively solve the welding abnormal problem caused by the failure to identify the missing welding piece, improve the detectability of the coil assembly 20 product production process, reduce the quality risk in the coil assembly 20 production process, and be beneficial to batch production and improve the product yield.

[0062] As shown in Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 8 and Figure 9 , in the embodiment of the present application, the connecting piece 2 includes a penetrating portion 23 (see Figure 9 ) and a welding portion 21. The penetrating portion 23 penetrates into the connecting hole 121, one end of the penetrating portion 23 extends out of the connecting hole 121, and the penetrating portion 23 is used to be riveted to form the welding portion 21 under the action of an external force. The riveted welding portion 21 is located outside the connecting hole 121 and abuts against the two side surfaces of the conductive piece 1, respectively, to realize the penetrating connection of the connecting piece 2 at the connecting hole 121. The welding portion 21 is used to be welded with the coil 3 to realize the fixed and conductive connection of the conductive piece 1 and the coil 3.

[0063] In some embodiments of the present application, the connecting piece 2 further includes a stop portion 22, as shown in Figure 4 and Figure 6 , wherein the first end of the penetrating portion 23 is connected with the stop portion 22, and the second end of the penetrating portion 23 is used to be riveted to form the welding portion 21 under the action of an external force. After the riveting of the welding portion 21, the stop portion 22 and the welding portion 21 are separately arranged on both sides of the connecting hole 121 and abut against the two side surfaces of the conductive piece 1, respectively, to realize the penetrating connection of the connecting piece 2 at the connecting hole 121.

[0064] In some embodiments of the present application, the connecting piece 2 can not include the stop portion 22, and the penetrating portion 23 is integrally connected in the connecting hole 121, as shown in Figure 9 , the end section of the penetrating portion 23 away from the welding portion 21 is enlarged, and the hole edge of the connecting hole 121 is provided in a shape matched with the penetrating portion 23, so that the penetrating portion 23 can be limited in the connecting hole 121.

[0065] Exemplarily, the connecting member 2 is a rivet riveted in the connecting hole 121. Before riveting, the connecting member 2 does not form the welding portion 21, the penetrating portion 23 penetrates through the connecting hole 121, the stop portion 22 stops at one side of the conductive member 1, and the second end of the penetrating portion 23 is riveted and upset at the other side of the conductive member 1 by a riveting device to form the welding portion 21 abutting against the surface of the other side of the conductive member 1. On the one hand, the riveted and upset welding portion 21 can realize the stable connection between the connecting member 2 and the conductive member 1, ensure the structure stability of the coil 3 after being connected with the conductive member 1, and is not easy to be disconnected. On the other hand, the riveted and upset welding portion 21 can expand the welding area, improve the stability of the coil 3 after being welded with the welding portion 21, further improve the welding quality, and ensure the good conduction between the conductive member 1 and the coil 3.

[0066] As shown in Figure 2 , it is a schematic view of the connecting member 2 after being riveted at the connecting hole 121 of the conductive member 1. As shown in Figure 3 , it is a schematic view of the coil assembly 20 formed after the coil 3 is welded with the welding portion 21.

[0067] In the embodiment of the present application, the cross section of the connecting hole 121 can be circular, elliptical or polygonal, but is not limited to the above-mentioned shapes. The polygonal shape is, for example, triangular, square, pentagonal, hexagonal and the like, as long as the penetrating portion 23 of the connecting member 2 can penetrate through and realize the riveting with the connecting member 2.

[0068] Specifically to the Figure 1 in the embodiment, the cross section of the connecting hole 121 is circular, which is a circular hole, and is more convenient to process and manufacture, and can be drilled or formed by a stamping process.

[0069] The cross section shape of the penetrating portion 23 can be consistent with the cross section shape of the connecting hole 121. For example, when the connecting hole 121 is a circular hole, the cross section of the penetrating portion 23 is circular, and the outer diameter of the penetrating portion 23 is substantially the same as or slightly smaller than the inner diameter of the connecting hole 121. Of course, the cross section shape of the penetrating portion 23 can be different from the cross section shape of the connecting hole 121. For example, when the connecting hole 121 is a circular hole, the cross section of the penetrating portion 23 is a hexagon inscribed in the circular hole.

[0070] The size of the connecting hole 121 is adjusted according to different current levels of low-voltage electrical apparatus such as starters and circuit breakers and the wire diameter of the coil 3.

[0071] In the embodiments of the present application, the material of the connecting piece 2 is any one of pure copper, red copper, oxygen-free copper, iron bronze, brass, tin phosphor bronze, copper alloy, and dispersion-strengthened copper-based material, and of course is not limited to the above listed materials. The above materials all contain copper component, have excellent wettability and high solder joint strength, are suitable for working in high temperature environment, and can ensure the stability of the welding connection. At the same time, the above materials containing copper component have better electrical conductivity, which ensures good electrical conductivity between the conductive piece 1 and the coil 3.

[0072] In the prior art, the silver alloy pre-stamped soldering piece is usually used to weld the conductive piece 1 and the coil 3, which has high cost. In the embodiments of the present application, the material of the connecting piece 2 can be used as the soldering material to realize the welding of the conductive piece 1 and the coil 3, and can save the use of precious metal silver alloy soldering material, thereby greatly reducing the production cost.

[0073] In the embodiments of the present application, the material of the conductive piece 1 is any one of copper-clad steel, copper complex brass layered composite material, copper complex stainless steel layered composite material, copper complex aluminum layered composite material, particle reinforced copper-based composite material, and copper alloy, and of course is not limited to the above listed materials. The above materials all contain copper component, have high strength and excellent electrical conductivity, can ensure that the coil assembly 20 has high electrical conductivity, reduce the heat generation of the coil assembly 20 when working, and have low cost, which is suitable for mass production.

[0074] The above copper-clad steel material is a material formed by coating copper on the surface of a steel core, which combines the electrical conductivity of copper and the strength of steel, and has excellent electrical conductivity and mechanical properties. The metal layered composite material is a material composed of two or more layers of different metals, which has better performance than single metal, and different metal layers can be selected according to needs to have multiple excellent properties, such as the above copper complex brass layered composite material, copper complex stainless steel layered composite material, and copper complex aluminum layered composite material.

[0075] Referring to Figure 1 and Figure 3 In some embodiments of the present application, the conductive piece 1 includes a first conductive plate 11 and a second conductive plate 12, the second conductive plate 12 is bent and connected to one end of the first conductive plate 11, and a connecting hole 121 penetrates through the second conductive plate 12. The coil 3 includes a spiral part 31 and a connecting part 32, the connecting part 32 is connected to one end of the spiral part 31 and extends along the axial direction of the spiral part 31, the connecting part 32 is located on the side of the second conductive plate 12 away from the first conductive plate 11 and is welded to the connecting piece 2. By arranging the second conductive plate 12 bent relative to the first conductive plate 11 and arranging the connecting part 32 extending along the axial direction of the spiral part 31, the welding operation is more convenient, sufficient space is provided for the welding operation, and the welding difficulty is reduced.

[0076] Further, the first conductive plate 11 comprises three conductive plate segments 111 connected in sequence by bending, the three conductive plate segments 111 approximately form a Z shape, and sequentially comprise a first conductive plate segment, a second conductive plate segment and a third conductive plate segment, the second conductive plate segment is connected to one side of the first conductive plate segment along the first direction and extends to the second direction, and the third conductive plate segment is connected to one side of the second conductive plate segment along the first direction and extends to the first direction. The second conductive plate 12 is connected to one side of the first conductive plate segment along the third direction, and the thickness direction of the second conductive plate 12 is the third direction, that is, the axial direction of the connecting hole 121 is the third direction. The first direction, the second direction and the third direction are perpendicular to each other, the second direction is the axial direction of the spiral part 31 of the coil 3, and the first direction and the third direction are both radial directions of the spiral part 31. The connecting part 32 of the coil 3 is located on the side of the second conductive plate 12 away from the first conductive plate 11 and is welded to the welding part 21, the layout is reasonable, and the welding operation is convenient.

[0077] In some other embodiments of the present application, referring to Figure 7 , the conductive part 1 can also have other structural forms, for example, a flat plate with a connecting hole 121 arranged thereon, the shape and structure of the conductive part 1 can be adaptively set according to the specific switch device, and is not limited to the structures shown in Figure 1 and Figure 7 . Here, the specific structural form of the conductive part 1 is not limited, as long as the connecting hole 121 is arranged through the conductive part 1.

[0078] In some other embodiments of the present application, the relative positions of the spiral part 31 and the connecting part 32 of the coil 3 are different from the above-mentioned manner. That is, the extension direction of the connecting part 32 is not along the axial direction of the spiral part 31, it can extend vertically after bending, or it can be inclined relative to the axial direction of the spiral part 31, and can be adaptively set according to the local space inside the switch device. Further, the coil 3 can be located on the side of the second conductive plate 12 away from the first conductive plate 11, or on the side facing the first conductive plate 11, or on the other two sides of the second conductive plate 12. That is, the coil 3 can be located on any side of the conductive part 1, and its axial direction can be perpendicular to one of the conductive plates of the conductive part 1, or can be parallel to the conductive part 1 or have an included angle with the conductive part 1, and can be adaptively designed and adjusted according to the space layout inside the switch device, and is not limited to the above-mentioned scheme. Here, the structure and relative position of the coil 3 and the conductive part 1 are not limited in any way. Referring to Figure 4 , Figure 5 and Figure 6The part of the connecting piece 2 outside the connecting hole 121 is provided with a welding surface 211, that is, the welding surface 211 is provided on the welding part 21, the welding surface 211 is welded with the coil 3, and at least one protruding structure 212 is protruded on the welding surface 211. By protruding the protruding structure 212 on the welding surface 211, the welding area can be increased, the welding strength of the coil 3 and the conductive piece 1 can be improved, and thus the welding quality of the coil assembly 20 product produced can be improved.

[0079] Specifically, when the connecting piece 2 is riveted, the riveting head of the riveting equipment has a structure matched with the protruding structure 212, and the protruding structure 212 is formed on the welding surface 211 after riveting.

[0080] In some embodiments of the present application, the protruding structure 212 is a strip-shaped protrusion and is provided with a plurality of strip-shaped protrusions which are distributed at intervals or which are distributed in a meshed manner. As shown in Figure 4 and Figure 6 The plurality of strip-shaped protrusions are distributed at intervals, so that the connection strength at the welding position is more uniformly distributed. The cross section of the strip-shaped protrusion can be triangular as shown in Figure 6 or square, arched, etc.

[0081] Alternatively, in some embodiments of the present application, the protruding structure 212 is a ring-shaped protrusion and is provided with a plurality of ring-shaped protrusions, the centers of the plurality of ring-shaped protrusions are distributed at intervals or the plurality of ring-shaped protrusions are distributed in a concentric manner, which also has the effect of increasing the welding area and improving the welding strength. The cross section of the ring-shaped protrusion can be triangular or square, arched, etc.

[0082] Alternatively, in some embodiments of the present application, the protruding structure 212 is a point-shaped protrusion and is provided with a plurality of point-shaped protrusions which are distributed at intervals, and further can be uniformly distributed to uniformly enhance the welding strength. For example, the plurality of point-shaped protrusions are distributed in a rectangular array or a circular array. The point-shaped protrusion can be a cylinder, a cone, a polygon or a sphere, but is not limited to the shapes listed.

[0083] In the embodiments of the present application, the connecting piece 2 is covered with a silver layer. Specifically, before the connecting piece 2 is riveted to the connecting hole 121, silver plating treatment is performed on the outer surface of the connecting piece 2 to form a silver layer, the connecting piece 2 covered with the silver layer is riveted to the connecting hole 121 of the conductive piece 1, and the welding part 21 formed after riveting has the above-mentioned protruding structure 212. The arrangement of the silver layer can further improve the contact reliability of the connecting piece 2 and the conductive piece 1, and can reduce the melting point of the solder during welding, so as to realize rapid and reliable welding. After the connecting piece 2 plated with silver is used to weld the conductive piece 1 and the coil 3, the contact resistance between the conductive piece 1 and the coil 3 can be reduced, and the electrical conductivity of the connection between the two can be ensured.

[0084] Of course, in some other embodiments of the application, the silver layer can also not be provided on the outer surface of the connecting piece 2. In particular, during the welding operation, the silver layer is selected according to the material of the coil 3 and the conductive piece 1.

[0085] Several different coil assemblies 20 are listed below with reference to two embodiments.

[0086] Embodiment 1:

[0087] In the coil assembly 20 of this embodiment, the coil 3 is made of copper, the conductive piece 1 is made of copper-clad steel, and the connecting piece 2 is made of H62 brass. The conductive piece 1 made of copper-clad steel is pre-punched with a circular connecting hole 121 that penetrates the thickness direction of the conductive piece 1.

[0088] Embodiment 2:

[0089] In the coil assembly 20 of this embodiment, the conductive piece 1 is made of Cu / SUS340 / Cu, the connecting piece 2 is made of T2 copper, and the coil 3 is made of copper. The conductive piece 1 made of Cu / SUS340 / Cu is pre-provided with an elliptical connecting hole 121 at the welding position, which is used to rivet the connecting piece 2 made of T2 copper. The connecting piece 2 made of T2 copper forms a protruding structure 212 after riveting, and the coil 3 made of copper is welded at the position of the protruding structure 212.

[0090] Compared with the existing connection method that pre-punches a welding tab, the structure of the coil assembly 20 provided in the embodiments of the application can effectively improve the yield, welding strength, and welding quality.

[0091] Example 2

[0092] The embodiment provides a low-voltage electrical appliance with a coil assembly 20, which includes a housing and the coil assembly 20 as described above, and the coil assembly 20 is arranged in the housing. The low-voltage electrical appliance with the coil assembly 20 has the advantages of low cost, high production efficiency, high quality, and high quality stability, thereby improving the production efficiency of the low-voltage electrical appliance, reducing the production cost of the low-voltage electrical appliance, improving the quality performance of the low-voltage electrical appliance, and maintaining a high production quality stability of the low-voltage electrical appliance.

[0093] For example, the low-voltage electrical appliance can be a starter, a circuit breaker, or other switching device of an alternating current motor, but is not limited to the listed switching devices.

[0094] Example 3

[0095] As shown in Figure 11 the embodiment provides a coil assembly preparation method for preparing the coil assembly 20 as described above, which includes:

[0096] S1, punching: a connecting hole 121 is punched at a preset position of the conductive piece 1;

[0097] S2, riveting: the connecting piece 2 is riveted in the connecting hole 121, so that the connecting piece 2 is partially located outside the connecting hole 121;

[0098] S3, welding: one end of the coil 3 is welded to the part of the connecting piece 2 located outside the connecting hole 121.

[0099] In step S1, the preset position is determined on the conductive piece 1 according to the welding position of the coil 3 and the conductive piece 1. Specifically, a through hole is punched in the thickness direction of the conductive piece 1 by a stamping process to form the connecting hole 121.

[0100] Before step S2, the connecting piece 2 is further subjected to silver plating treatment to form a silver layer on the outer surface of the connecting piece 2. The beneficial effects of the silver plating treatment are as described above. In step S2, the protruding structure 212 is formed on the welding part 21 of the riveted connecting piece 2 to increase the welding area and improve the welding strength and quality. The conductive piece 1 and the connecting piece 2 after riveting form a riveting assembly 10 as shown. Figure 2

[0101] In step S3, any one of resistance welding, ultrasonic welding, and laser welding is used to weld the connecting part 32 of the coil 3 to the protruding structure 212 of the riveting assembly 10 obtained in step S2, and finally obtain the required coil assembly 20 as shown. Figure 3

[0102] In the coil assembly preparation method provided in the embodiments of the present application, the connecting hole 121 is pre-set at the welding position of the conductive piece 1, and the connecting piece 2 made of welding material is arranged and riveted in the connecting hole 121. When the coil 3 and the connecting piece 2 are welded, no additional welding filler is needed to realize the welding connection of the two, the welding process is simplified, and compared with the way of welding the coil 3 and the conductive piece 1 by welding sheets, the production efficiency is improved, thereby improving the production efficiency of the low-voltage electrical appliance with the coil assembly 20. Moreover, by setting the connecting hole 121, the installation position of the connecting piece 2 on the conductive piece 1 is facilitated, thereby accurately positioning the welding position of the coil 3 and the conductive piece 1, effectively improving the positioning accuracy, and ensuring the excellent quality of the welded coil assembly 20.

[0103] ​​In addition, in the process of welding the coil 3 and the connecting piece 2, if there is a conductive piece 1 that is not riveted with the connecting piece 2 in the connecting hole 121, at this time, the conductive piece 1 is a through hole at the position to be welded, which can be quickly identified by the equipment on the automatic production line, so as to separate the conductive piece 1, avoid the direct welding of the conductive piece 1 with the coil 3 without the connecting piece 2, effectively solve the welding abnormal problem caused by the failure to identify the missing welding piece, improve the detectability of the coil assembly 20 product production process, reduce the quality risk in the coil assembly 20 production process, and be beneficial to batch production and improve the product yield.

[0104] The coil 3 is made of copper, the conductive piece 1 is made of copper-clad steel, and the connecting piece 2 is made of H62 brass, and the preparation method is further specifically described.

[0105] Step S1: punching. A circular connecting hole 121 penetrating the thickness direction of the conductive piece 1 is punched at a predetermined position of the conductive piece 1 made of copper-clad steel.

[0106] Step S2: riveting. The connecting piece 2 (rivet) made of H62 brass is riveted at the connecting hole 121 processed on the conductive piece 1 in step S1 to obtain a riveting assembly 10 with a protruding structure 212 on the surface of the rivet cap (welding part 21); the protruding structure 212 is a strip-shaped protrusion, and the cross section is triangular, so that the surface of the rivet cap forms a sawtooth structure as shown in FIG. 2. Figure 6

[0107] Step S3: welding. The connecting part 32 of one end of the coil 3 made of copper is resistance-welded to the rivet cap (welding part 21) of the riveting assembly 10 obtained in step S2, and finally the required coil assembly 20 is obtained.

[0108] Compared with the existing connecting method of pre-punching a welding piece, the coil assembly preparation method provided by the embodiment can improve the yield by 16% and increase the welding strength by 8%.

[0109] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled persons in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the utility model shall be included in the protection scope of the utility model claims.​

Claims

1. A coil assembly characterized by, The application relates to a coil assembly. The coil assembly comprises a conductive piece (1) and a connecting piece (2). The connecting piece (2) is made of welding material and is connected to the connecting hole (121) of the conductive piece (1). The coil (3) is welded to the connecting piece (2).

2. The coil assembly of claim 1, wherein, The connecting piece (2) comprises a penetrating part (23) and a welding part (21). The penetrating part (23) penetrates the connecting hole (121) and one end of the penetrating part (23) is used to form the welding part (21) under the action of external force.

3. The coil assembly of claim 2, wherein, The welding part (21) is located outside the connecting hole (121) and abuts against the conductive piece (1).

4. The coil assembly of claim 1, wherein, The welding part (21) is welded to the coil (3).

5. The coil assembly of claim 1, wherein, The connecting piece (2) further comprises a stop part (22) which is arranged at the other end of the penetrating part (23) and abuts against the conductive piece (1).

6. The coil assembly of claim 1, wherein, The cross section of the connecting hole (121) is circular, elliptical or polygonal.

7. The coil assembly of claim 1, wherein, The connecting piece (2) is made of pure copper, red copper, oxygen-free copper, iron bronze, brass, tin-phosphor bronze, copper alloy or dispersion-strengthened copper-based material.

8. The coil assembly of any of claims 1-7, wherein, The conductive piece (1) is made of copper-clad steel, copper-clad brass laminated composite material, copper-clad stainless steel laminated composite material, copper-clad aluminum laminated composite material, particle-reinforced copper-based composite material or copper alloy.

9. The coil assembly of claim 8, wherein, The coil (3) comprises a spiral part (31) and a connecting part (32) which is connected to one end of the spiral part (31) and welded to the connecting piece (2). The part of the connecting piece (2) located outside the connecting hole (121) is provided with a welding surface (211) which is welded to the coil (3). The welding surface (211) is provided with at least one protruding structure (212). The protruding structure (212) is a strip-shaped protrusion and is provided with a plurality of strip-shaped protrusions which are distributed at intervals or are distributed in a net-like cross shape. Alternatively, The protruding structure (212) is a ring-shaped protrusion and is provided with a plurality of ring-shaped protrusions whose centers are distributed at intervals or are distributed in a concentric circle shape.

10. The coil assembly of any of claims 1-7, wherein, Alternatively, 11. Low voltage electrical apparatus having a coil assembly, characterized by The protruding structure (212) is a dot-shaped protrusion and is provided with a plurality of dot-shaped protrusions. The dot-shaped protrusions are distributed at intervals and are in the shape of a cylinder, a cone, a polygon or a sphere. The connecting piece (2) is covered with a silver layer. The coil assembly is arranged in a shell.

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