Coil assembly beneficial to automation

Abstract

The utility model discloses a coil assembly beneficial to automation. The coil assembly comprises a coil framework, a thermal protector, an enameled wire wound on the coil framework, and a first external insertion piece and a second external insertion piece which are fixed at one end of the coil framework and are respectively connected with two ends of the enameled wire. One end of the coil framework is provided with a heightening part, the inserting parts of the first external inserting piece and the second external inserting piece are arranged in parallel in the lateral direction of the heightening part, and the first external inserting piece is provided with a riveting point riveted with the side face of an outgoing line of the thermal protector. And the surface of the heightening part between the riveting point and the winding groove of the coil framework is provided with a positioning buckle for inserting an outgoing line of the heat protector. According to the utility model, a glue fixing method is replaced by an assembly fixing method. The middle part of the lead-out wire is fixed by using the positioning buckle, so that the lead-out wire cannot be extruded and bent by the molding compound. The fixing mode is stable and rapid, and coil plastic packaging can be directly carried out without using glue, so that the production period is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of micro-motors, in particular to a coil component which is beneficial to automation. Background Art

[0002] In the existing coil automation production line, there are several significant problems in the coil production process:

[0003] 1. If Figure 1 , the cylindrical thermal protection pin 5 and the positioning buckle 4 are used to fasten the thermal protection lead wire to the plug-in sheet. This thermal protection pin 5 structure is easy to deform. During the thermal protection turnover process, the thermal protection pin 5 is squeezed into different shapes. The thermal protection pin 5 is difficult to snap into the positioning buckle 4, which is not conducive to the automatic production of the coil. The applicant's previous patents also use various forms of fastening methods. For example, patent number CN210201582U uses a limiter and a spring buckle to press the thermal protection lead wire in turn. This structure also has the above problems to a certain extent, and the bending part processing on the terminal and the assembly process of the terminal and the spring buckle are both relatively high.

[0004] 2. The thermal protector pin is cylindrical, and the thermal protector can rotate axially along the top of the pin. When the coil is plastic-sealed, the plastic sealant will flush out the thermal protector, and glue is needed to fix the thermal protector to the coil assembly, and it takes 24 hours for the glue to solidify, which increases the production cycle and cost.

[0005] 3. To improve the above two problems, Figure 2 As shown, the thermal protector is riveted and fixed to the external plug-in sheet 13 (lateral riveting and flattening), so that the thermal protector 1 cannot rotate axially along the top of the pin. However, this structure requires that the riveted part of the thermal protector needs to extend out of the coil frame and be riveted to the tooling assembly, resulting in a longer thermal protector pin 5. Figure 3 As shown, after the thermal protector 1 is assembled with the coil, it is top-heavy and the thermal protection pin 5 is long. One end of the thermal protection pin 5 tilts up at a large angle and cannot overlap with the external plug-in chip 13. After the thermal protector and the coil are assembled, they are easy to fall off during circulation on the assembly line, reducing the qualified rate of coil production. When the coil is plastic-sealed, the thermal protection pin floats out of the plastic sealing material due to the impact of the plastic sealing material. The height space at the end of the coil skeleton is limited, and the conditions for installing the pin positioning structure are not met. Glue is also required to fix it.

[0006] 4. The external plug-ins are all installed horizontally, so the external plug-ins occupy a large horizontal space at one end of the coil skeleton. When non-cylindrical thermal protection pins are used, the thermal protection pins need to be bent to make way for the external plug-ins. Patent No. CN217933355U uses non-cylindrical thermal protection pins and deformable clamps to tighten the thermal protection pins. In order to ensure that the thermal protection pins do not fall off and avoid the plug-ins, the structure of the pins needs to be specially designed, and the structure is relatively complex.

[0007] 5. Usually, the coil assembly uses enameled wire with a wire diameter of 0.3 or less. The wire diameter is relatively thin. There is a gap below the bend of the plug after pressing down. After the electrode is spot welded, the enameled wire can still move under the bend, resulting in poor contact. Therefore, multiple strands of enameled wire are required (it means that the end of an enameled wire is folded in half 3 or 4 times, and then twisted into a thick wire to fill the gap below the bend of the plug). This process method takes up a lot of time for enameled wire twisting, reduces production efficiency and is not conducive to the automated production of coils.

[0008] In order to solve these problems, we urgently need to develop a new type of coil assembly, whose design should effectively improve the efficiency of automated coil production. Utility Model Content

[0009] In order to solve the technical problems in the production process of the prior art coil assembly that the thermal protector pins are improperly fixed, resulting in the thermal protector body being easy to fall off or the thermal protector pins being inconvenient for automated installation, the utility model provides a coil assembly that is conducive to automation to solve the above problems.

[0010] The utility model solves the technical problem by adopting a technical solution: a coil assembly conducive to automation, comprising a coil frame, a thermal protector, an enameled wire wound on the coil frame, and a first external plug-in sheet and a second external plug-in sheet fixed at one end of the coil frame and respectively connected to two ends of the enameled wire.

[0011] One end of the coil skeleton has a raised portion, and the connecting portions of the first external plug-in sheet and the second external plug-in sheet are arranged in parallel to the side of the raised portion. The first external plug-in sheet has a rivet point riveted to the side of the lead wire of the thermal protector, and the surface of the raised portion between the rivet point and the winding groove of the coil skeleton has a positioning buckle for inserting the lead wire of the thermal protector.

[0012] Furthermore, the lead wire of the thermal protector is a non-cylindrical structure.

[0013] Furthermore, the lead wire of the thermal protector extends along a straight line.

[0014] Furthermore, the thermal protector is provided with two lead-out wires, the positioning buckles correspond to the lead-out wires one-to-one, and the center distance j of the two positioning grooves satisfies: 3mm≤j≤5mm.

[0015] Furthermore, the coil skeleton has two skeleton parts, and the distance k between the positioning buckle and the surface of the skeleton part where the positioning buckle is located facing the other skeleton part satisfies: 3mm≤k≤6mm.

[0016] Furthermore, the ratio of the length c of the positioning buckle to the height d of the end face of the coil skeleton where it is located is: 0.3d≤c≤d; the single-sided contact length a of the positioning buckle and the lead-out wire satisfies: 0.3mm≤a≤0.6mm, and the distance e between the inner bottom surface of the positioning buckle and the surface of the coil skeleton satisfies: 1.5mm≤e≤3mm.

[0017] Furthermore, the opening of the positioning buckle is provided with a chamfer.

[0018] Furthermore, the first external plug-in sheet and the second external plug-in sheet have a bending portion for crimping the enameled wire, and the surface of the external plug-in sheet located below the bending portion is coated with solder paste, and the solder paste is arranged close to the root of the bending portion.

[0019] Furthermore, a storage groove is provided on the surface of the bending portion facing the solder paste, and when the bending portion is pressed, the storage groove can accommodate the solder paste.

[0020] Furthermore, the depth f of the storage groove satisfies: 0.05mm≤f≤0.1mm.

[0021] Furthermore, the length g of the bending portion and the length h of the storage slot satisfy the following relationship: 0.25h≤g≤0.5h.

[0022] The beneficial effects of the utility model are:

[0023] (1) The utility model adopts an assembly fixing method to replace the glue fixing method. A positioning buckle is used to fix the middle part of the lead wire of the thermal protector so that the lead wire will not be squeezed and bent by the plastic sealing material. This fixing method is both stable and fast, and the coil can be directly plastic sealed without using glue, thereby shortening the production cycle and improving production efficiency.

[0024] (2) The utility model can reduce manual intervention, so that the thermal protector can be naturally and stably fixed on the coil frame, so that the lead wire of the thermal protector can overlap with the first external plug-in as much as possible, and will not fall off during the turnover process, thereby improving the qualified rate of coil automatic production.

[0025] (3) The utility model adds solder paste under the two external plug-ins and the bent portion of the external plug-in, and the solder paste can be melted into the plug-ins to fill the gap. When using enameled wires with a wire diameter of 0.3 or less, the wire twisting process can be eliminated, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0027] Figure 1 It is a mounting structure of a thermal protector in a coil assembly of the prior art;

[0028] Figure 2It is a mounting structure of a thermal protector in a coil assembly of the prior art;

[0029] Figure 3 yes Figure 2 Schematic diagram of the thermal protection pin warping under the structure shown;

[0030] Figure 4 It is an exploded view of a specific embodiment of the coil assembly that is conducive to automation according to the utility model;

[0031] Figure 5 It is a stereogram of a specific embodiment of the coil assembly that is conducive to automation according to the utility model;

[0032] Figure 6 It is the front view of the coil skeleton in the utility model;

[0033] Figure 7 It is a top view of the coil skeleton in the utility model;

[0034] Figure 8 yes Figure 7 Enlarged view of point A in the middle;

[0035] Fig. 9 yes Figure 5 A front view of a coil assembly that facilitates automation is shown;

[0036] Fig.10 yes Fig. 9 Enlarged view of point B in the middle;

[0037] Fig.11 It is a stereogram of a specific embodiment of the coil assembly that is conducive to automation according to the utility model;

[0038] Fig.12 yes Fig.11 Enlarged view of point C in the middle;

[0039] Fig.13 It is a schematic diagram of the dimensions of the bending portion in the utility model.

[0040] In the figure, 1, thermal protector, 2, external plug-in, 3, external plug-in I, 4, positioning buckle, 5, thermal protection pin, 6, coil skeleton, 601, skeleton part, 602, winding groove, 7, enameled wire, 8, first external plug-in, 9, second external plug-in, 10, heightening part, 11, riveting point, 12, storage slot, 13, positioning buckle, 1301, chamfer, 14, lead wire, 15, connector part, 16, bending part, 17, solder paste. DETAILED DESCRIPTION

[0041] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0042] Embodiment 1

[0043] like Figure 3-Figure 6 As shown, a coil assembly conducive to automation includes a coil frame 6, a thermal protector 1, an enameled wire 7 wound on the coil frame 6, and a first external plug-in sheet 8 and a second external plug-in sheet 9 fixed to one end of the coil frame 6 and connected to both ends of the enameled wire 7 respectively.

[0044] The positioning buckle 13 can press the lead wire 14 onto the surface of the coil skeleton 6 before the thermal protector 1 and the coil skeleton 6 are sealed, thereby avoiding the problem of the lead wire 14 tilting and warping after sealing due to top-heavy packaging. The lead wire 14 can fit well with the riveting point 11 of the first external plug-in piece 8, which is conducive to automated installation.

[0045] In the prior art, since the plug-in portion 15 of the external plug-in is installed horizontally, the height space of the part where the external plug-in is installed at the end of the coil skeleton 6 is small, and there is no space for installing the pin positioning structure between the winding groove 602 and the riveting point 11 between the thermal protection pin and the external plug-in. In this application, a heightened portion 10 is added to one end of the coil skeleton 6, and the plug-in portions 15 of the first external plug-in 8 and the second external plug-in 9 are arranged laterally and parallel to the heightened portion 10. The first external plug-in 8 has a riveting point 11 riveted to the side of the lead wire 14 of the thermal protector 1. The surface of the heightened portion 10 between the riveting point 11 and the winding groove 602 of the coil skeleton 6 is provided with a positioning buckle 13 for inserting the lead wire 14 of the thermal protector 1. The riveting part of the lead wire 14 is located on the side, which can prevent the thermal protector 1 from rotating around the end of the lead wire 14.

[0046] The lateral plane arrangement means that the sides (surfaces with larger width) of the connector 15 are parallel and opposite to each other. Compared with the horizontal installation in the prior art, the connector 15 occupies a larger space in the height direction and a smaller space of the coil skeleton 6 in the horizontal direction. Correspondingly, the distance between the riveting point 11 and the winding groove 602 is increased, and there is enough space in between to install the positioning buckle 13, and the lead wire 14 does not need to make way for the connector 15 and bend.

[0047] The lead wire 14 of the thermal protector 1 can be a cylindrical structure or a non-cylindrical structure. The utility model preferably adopts a non-cylindrical structure, and the lead wire 14 can extend along a straight line.

[0048] The thermal protector 1 is provided with two lead wires 14 , and two positioning buckles 13 are also provided correspondingly, for the lead wires 14 to be inserted one by one. The opening of the positioning buckle 13 is preferably provided with a chamfer 1301 , and the chamfer 1301 can guide the lead wire 14 when inserting into the positioning buckle 13 .

[0049] like Figure 6 As shown, the center distance j of the two positioning grooves satisfies: 3mm≤j≤5mm. This size can meet the installation of the lead wires 14 of different types of thermal protectors 1.

[0050] like Figure 6 As shown, the coil skeleton 6 has two skeleton parts 601, and the first external plug-in sheet 8 and the second external plug-in sheet 9 are respectively installed on the two skeleton parts 601. In order to avoid the interference of the positioning buckle 13 with other components in the motor, the distance k between the positioning buckle 13 and the surface of the skeleton part 601 where it is located facing the other skeleton part 601 satisfies: 3mm≤k≤6mm.

[0051] like Figure 7-Figure 10 As shown, in order to ensure the connection strength between the positioning buckle 13 and the lead wire 14 and the lead wire 14 can smoothly enter the positioning buckle 13, the size of the positioning buckle 13 needs to be limited: in the height direction, the ratio of the length c of the positioning buckle 13 to the height d of the end face of the coil skeleton 6 where it is located is: 0.3d≤c≤d, which can increase the contact area between the thermal protector 1 and the positioning buckle 13, improve the pull-off force of the thermal protector 1, and prevent the thermal protector 1 from being washed out by the plastic sealing material when the thermal protector 1 and the coil skeleton 6 are plastic sealed. In the design of the contact surface between the positioning buckle 13 and the lead wire 14, the single-sided contact length a of the positioning buckle 13 and the lead wire 14 meets: 0.3mm≤a≤0.6mm, which increases the pull-off force of the thermal protector 1 from the positioning buckle 13; the distance e between the inner bottom surface of the positioning buckle 13 and the surface of the coil skeleton 6 meets 1.5mm≤e≤3mm, which supports the lead wire 14 of the thermal protector 1 so that the thermal protector 1 can be placed as horizontally as possible.

[0052] This embodiment adopts an assembly fixing method instead of a glue fixing method, and uses a positioning buckle 13 to fix the middle part of the lead wire 14, so that the lead wire 14 will not be squeezed and bent by the plastic packaging material. This fixing method is both stable and fast, and the coil can be directly plastic-sealed without using glue, thereby shortening the production cycle and improving production efficiency.

[0053] Embodiment 2

[0054] The first external plug-in sheet 8 and the second external plug-in sheet 9 have a bending portion 16 for crimping the enameled wire 7. Usually, the enameled wire 7 is placed under the bending portion 16, pressed tightly, and then fixed by electric welding. Fig.11 and Fig.12As shown, the surface of the external plug-in sheet below each external plug-in sheet bending portion 16 is coated with solder paste 17, and the solder paste 17 is arranged close to the root of the bending portion 16. The solder paste 17 can be melted into the external plug-in sheet to fill the gap. When using enameled wire 7 with a wire diameter of 0.3 or less, the wire twisting process can be eliminated to improve production efficiency. The figure only shows the first external plug-in sheet 8, and the bending portion 16 on the second external plug-in sheet 9 is the same as it.

[0055] In further design, Fig.13 As shown, a storage groove 12 is provided on the surface of the bending portion 16 directly facing the solder paste 17. When the bending portion 16 is pressed, the storage groove 12 can accommodate the solder paste 17. After the bending portion 16 is pressed down, due to the existence of the storage groove 12, the solder paste 17 will not be squeezed and overflowed due to the bending portion 16 pressing down. During the electrode spot welding, the electrode head is prevented from touching the solder paste 17 to cause tin frying, resulting in damage to the enameled wire 7 around the solder paste 17, thereby improving the qualified rate of automated coil production.

[0056] The depth f of the storage groove 12 satisfies: 0.05 mm ≤ f ≤ 0.1 mm.

[0057] Further, such as Fig.13 As shown, the length g of the bending portion 16 and the length h of the storage slot 12 satisfy the following relationship: 0.25h≤g≤0.5h. The storage slot and the bending portion 16 are preferably of the same width. In this case, due to the larger area of ​​the storage slot 12, the fault tolerance of the automated solder paste 17 can be increased, while ensuring the strength of the bending portion 16 to prevent the corner from breaking when the electrode head is pressed down for spot welding.

[0058] In the description of the present invention, it is necessary to understand that the terms "length", "width", "up", "down", "inside", "outside", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0059] In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments.

[0060] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A coil assembly that is conducive to automation, characterized in that: It includes a coil frame, a thermal protector, an enameled wire wound on the coil frame, and a first external plug-in sheet and a second external plug-in sheet fixed to one end of the coil frame and respectively connected to two ends of the enameled wire; One end of the coil skeleton has a raised portion, and the connecting portions of the first external plug-in sheet and the second external plug-in sheet are arranged in parallel to the side of the raised portion. The first external plug-in sheet has a rivet point riveted to the side of the lead wire of the thermal protector, and the surface of the raised portion between the rivet point and the winding groove of the coil skeleton has a positioning buckle for inserting the lead wire of the thermal protector.

2. The coil assembly according to claim 1, characterized in that: The lead-out wire of the thermal protector is a non-cylindrical structure.

3. The coil assembly according to claim 2, characterized in that: The lead wire of the thermal protector extends along a straight line.

4. The coil assembly according to claim 1, characterized in that: The thermal protector is provided with two lead-out wires, the positioning buckles correspond to the lead-out wires one by one, and the center distance j of the two positioning grooves satisfies: 3mm≤j≤5mm.

5. The coil assembly that facilitates automation according to claim 4, characterized in that: The coil skeleton has two skeleton parts, and the distance k between the positioning buckle and the surface of the skeleton part where it is located facing the other skeleton part satisfies: 3mm≤k≤6mm.

6. The coil assembly that facilitates automation according to claim 1, characterized in that: The ratio of the length c of the positioning buckle to the height d of the end face of the coil skeleton on which it is located is: 0.3d≤c≤d; the single-sided contact length a of the positioning buckle and the lead-out wire satisfies: 0.3mm≤a≤0.6mm, and the distance e between the inner bottom surface of the positioning buckle and the surface of the coil skeleton satisfies: 1.5mm≤e≤3mm.

7. The coil assembly that facilitates automation according to claim 1, characterized in that: The first external plug-in sheet and the second external plug-in sheet have a bending portion for crimping the enameled wire, and the surface of the external plug-in sheet below the bending portion is coated with solder paste, and the solder paste is arranged close to the root of the bending portion.

8. The coil assembly that facilitates automation according to claim 7, characterized in that: A storage groove is provided on the surface of the bending portion facing the solder paste, and when the bending portion is pressed, the storage groove can accommodate the solder paste.

9. The coil assembly that facilitates automation according to claim 8, characterized in that: The depth f of the storage groove satisfies: 0.05mm≤f≤0.1mm.

10. The coil assembly that facilitates automation according to claim 8, characterized in that: The length g of the bending portion and the length h of the storage slot satisfy the following relationship: 0.25h≤g≤0.5h.

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