Electromagnetic relay with injection molding positioning structure

Abstract

The utility model provides an electromagnetic relay with an injection molding positioning structure, and belongs to the technical field of electromagnetic products. According to the utility model, the end insulating parts at the two ends of the coil framework in the electromagnetic base are respectively provided with the protruding and downward extending supporting legs, the downward extending ends of the supporting legs are provided with the positioning surfaces, and the groove bottom of the accommodating groove of the accommodating cavity of the base body which is injection-molded outside the coil framework is provided with the avoiding holes matched with the positioning surfaces, so that the positioning surfaces of the supporting legs can be accurately positioned. When the containing groove is formed outside the coil framework in a secondary injection molding mode, the coil framework can be directly placed in a mold of the base body through the positioning faces of the supporting feet at the ends of the coil framework, positioning and supporting are achieved, the accuracy of the position of the coil framework and the stability during injection molding are guaranteed, the stroke consistency of the armature assembly is improved, the adjustment-free rate is increased, and the reject ratio is reduced. The insulating effect is ensured, a positioning and supporting structure does not need to be additionally arranged, the structure is simple, operation is convenient, production efficiency is improved, material waste is avoided, and manufacturing cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic product technology, specifically to an electromagnetic relay with an injection-molded positioning structure. Background Technology

[0002] Electromagnetic relays are commonly used in circuit control and other applications. They enable the closing or opening of relevant contacts to conduct or disconnect related circuits, thus meeting the needs of on / off control and commutation adjustment. Therefore, it is necessary to ensure the quality of the product so that it can perform at its best.

[0003] Currently, commonly used electromagnetic relays on the market, such as the one disclosed in patent CN200510044864.4, include a housing, an armature component, and a base. The armature component is mounted on the base, and the armature component and the base are fitted inside the housing. Furthermore, the base includes a stationary spring, a lead-out spring, a coil frame with an iron core, a coil, and an outer insulating material. The coil is wound on the coil frame, and the stationary spring, lead-out spring, and coil component form an integral structure through the outer insulating material. Additionally, the armature component includes an armature, a magnet attached to the armature, a moving spring on the side of the armature, and an insulating material that injection-moldes the armature, magnet, and moving spring together to form an integral structure. The middle part of the armature component is rotatably supported in the middle of the base, allowing the moving spring and stationary spring to contact or separate even when the armature component is tilted, thus meeting usage requirements. Although the above structure can meet the normal use requirements, the base needs to be injection molded first during the production process, and the outer insulation material needs to be injection molded after the coil frame and winding processes are completed. Therefore, the coil frame needs to be placed in the corresponding mold for secondary injection molding. In order to improve the consistency of the armature component stroke, increase the product adjustment-free rate, reduce finished product defects, and ensure the insulation effect and improve the performance, the coil frame must be accurately positioned in the corresponding mold and its state needs to be maintained stable during the injection molding process. Therefore, it is necessary to set a positioning structure on the mold to position the coil frame and suspend the coil frame in the corresponding mold. This not only reduces the injection molding efficiency and affects demolding, but also causes material waste and increases manufacturing costs. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention aims to provide an electromagnetic relay with an injection molding positioning structure. The relay features protruding support feet on both sides of the end insulation portion at both ends of the coil frame. Simultaneously, clearance holes corresponding to the support feet are provided on both sides of both ends of the base body. This allows the coil frame to be positioned and supported by the support feet contacting the inner wall of the mold during secondary placement. This ensures the coil frame is accurately and stably positioned within the mold, guaranteeing consistent armature stroke, improving adjustment efficiency, reducing product defects, and enhancing insulation. Furthermore, it eliminates the need for additional positioning structures, allowing for direct placement, convenient operation, higher efficiency, and easier demolding, thus avoiding material waste and reducing manufacturing costs.

[0005] The specific technical solution is as follows:

[0006] An electromagnetic relay with an injection-molded positioning structure includes an electromagnetic base and an armature assembly. The armature assembly is rotatably mounted on the center of the electromagnetic base. The electromagnetic base includes a coil frame, a coil, and a base body. The coil is wound on the coil frame. The base body is injection-molded and wrapped around the coil frame with the coil wound on it. The coil frame includes an iron core and a frame body. The frame body is wrapped around the iron core and forms end insulation portions at both ends of the iron core. Each end insulation portion has a support foot protruding from its opposite end face. Each support foot extends downward and has a positioning surface at its downward-extending end. The base body has a receiving cavity. The inner wall of the receiving cavity has a receiving groove corresponding to each support foot. The bottom of each receiving groove has a clearance hole. The positioning surface of the support foot is located in the corresponding clearance hole and is flush with the outer surface of the base body at the clearance hole.

[0007] In the aforementioned electromagnetic relay with an injection-molded positioning structure, each end insulation portion has a support foot on both sides, the two support feet are spaced apart, and the positioning surfaces of the two support feet are located in the same height plane along the vertical direction.

[0008] In the aforementioned electromagnetic relay with injection-molded positioning structure, a protrusion is provided on each end insulating part and between the two support feet, and a limiting groove is provided between the protrusion and the support feet on both sides.

[0009] In the aforementioned electromagnetic relay with an injection-molded positioning structure, the protrusion extends downwards, and the end of the protrusion extending downwards is lower than the end of the corresponding two support legs extending downwards.

[0010] In the aforementioned electromagnetic relay with injection-molded positioning structure, a plurality of protruding limiting blocks are provided on the inner wall of the receiving cavity of the base body. Each limiting block corresponds to a limiting groove. When the base body is wrapped around the coil frame, the limiting block is embedded in the corresponding limiting groove. Furthermore, a groove is provided between two limiting blocks, and the protrusion is embedded in the groove.

[0011] In the aforementioned electromagnetic relay with injection-molded positioning structure, a contact hole is provided on the side wall of the slot at the end opposite to the positioning surface in each limiting slot, and a protruding limiting support is provided on the side of the iron core. The bottom of the limiting support is the limiting surface, and the limiting surface is located inside the contact hole and is flush with the side wall of the slot where the contact hole is located in the limiting slot.

[0012] In the aforementioned electromagnetic relay with an injection-molded positioning structure, both sides of the downward-extending end of the protrusion and the downward-extending end of the support foot are provided with narrowed bevels.

[0013] In the aforementioned electromagnetic relay with an injection-molded positioning structure, a wiring groove is provided at the bottom of each end insulation portion.

[0014] The positive effects of the above technical solution are:

[0015] The aforementioned electromagnetic relay with injection molding positioning structure features downward-extending support feet on the end insulation portions at both ends of the coil frame, with a positioning surface at one end of each support foot. Furthermore, a corresponding receiving groove is provided in the receiving cavity of the base body, which surrounds the coil frame. This achieves a perfect fit between the base body and the coil frame, improving connection stability. Additionally, a clearance hole is provided at the bottom of the receiving groove, and the positioning surface of the support foot is located within this clearance hole and flush with the outer surface of the base body where the clearance hole is located. This allows for accurate and stable positioning within the mold of the base body when the base body is injection molded onto the coil frame containing the coil. This satisfies positioning and support requirements, improves injection molding quality, ensures consistent armature component stroke, increases product adjustment efficiency, reduces finished product defects, and guarantees insulation performance. Moreover, injection molding can be performed without the need for an additional positioning structure, making operation more convenient, easier to demold, and increasing production efficiency. It also avoids material waste and effectively reduces manufacturing costs. Attached Figure Description

[0016] Figure 1 This is a structural diagram of an embodiment of an electromagnetic relay with an injection-molded positioning structure according to the present invention;

[0017] Figure 2 This is a structural diagram of the electromagnetic base of an electromagnetic relay with an injection-molded positioning structure according to the present invention;

[0018] Figure 3 This is a structural diagram of the coil frame of an electromagnetic relay with an injection-molded positioning structure according to the present invention;

[0019] Figure 4 This is a structural diagram of the base of an electromagnetic relay with an injection-molded positioning structure according to the present invention.

[0020] In the attached diagram: 1. Electromagnetic base; 11. Coil frame; 12. Coil; 13. Base body; 111. Iron core; 112. Frame body; 131. Receiving cavity; 132. Receiving groove; 133. Clearance hole; 134. Limiting block; 135. Insert groove; 1111. Limiting surface; 1121. End insulation part; 1122. Support foot; 1123. Protrusion; 1124. Limiting groove; 11211. Wiring groove; 11221. Positioning surface; 11241. Contact hole; 2. Armature assembly. Detailed Implementation

[0021] To make the technical means, creative features, objectives, and effects of this utility model easier to understand, the following embodiments are provided in conjunction with the appendix. Figure 1 To be continued Figure 4 The technical solution provided by this utility model is described in detail, but the following content is not intended to limit this utility model.

[0022] Figure 1 This is a structural diagram of an embodiment of an electromagnetic relay with an injection-molded positioning structure according to the present invention; Figure 2 This is a structural diagram of the electromagnetic base of an electromagnetic relay with an injection-molded positioning structure according to this utility model. Figure 1 and Figure 2 As shown, the electromagnetic relay with injection-molded positioning structure provided in this embodiment includes: an armature assembly 2, an electromagnetic base 1, and a housing. The middle part of the armature assembly 2 is rotatably mounted on the middle part of the electromagnetic base 1, and the housing is fitted over both. At this time, the structure of the armature assembly 2 is the same as or similar to that of the armature assembly 2 of a conventional electromagnetic relay. Furthermore, the electromagnetic base 1 includes a coil frame 11, a coil 12, and a base body 13. During manufacturing, the coil 12 is wound around the coil frame 11, and then the base body 13 is injection-molded and wrapped around the coil frame 11 with the coil 12 wound around it to form an integral structure.

[0023] Figure 3 This is a structural diagram of the coil frame of an electromagnetic relay with an injection-molded positioning structure according to the present invention; Figure 4 This is a structural diagram of the base of an electromagnetic relay with an injection-molded positioning structure according to this utility model. Figures 1 to 4As shown, the coil frame 11 for winding the coil 12 includes an iron core 111 and a frame body 112. The frame body 112 is directly wrapped around the iron core 111 by injection molding. The frame body 112 forms protrusions 1123 at both ends of the iron core 111. These protrusions 1123 constitute the end insulation portions 1121 at both ends of the iron core 111, facilitating the stable installation and lead-out of the coil 12, and also providing a positioning structure for the subsequent secondary injection molding of the base body 13. At this time, a support foot 1122 protrudes from the end face of each end insulation portion 1121 on the opposite side, i.e., the support foot 1122 is arranged outwards, facilitating subsequent mold fitting with the base body 13. Furthermore, each support foot 1122 extends downwards, so that the support foot 1122 covers the height of the end insulation portion 1121 in the vertical direction, providing conditions for subsequent vertical support and positioning. In addition, each support leg 1122 has a positioning surface 11221 on its downward-extending end face. The positioning surface 11221 contacts the mold of the base body 13, achieving positioning and support. Furthermore, after injection molding, the base body 13 forms a receiving cavity 131, which mates with the coil frame 11 containing the coil 12, allowing the base body 13 to be wrapped around the coil frame 11. At this time, receiving grooves 132 corresponding to each support leg 1122 are formed on the inner wall of the receiving cavity 131, enabling the support legs 1122 to fit into the base body 13 through the receiving grooves 132, thus improving the stability and reliability of the structure after the coil frame 11 and the base body 13 are integrally injection molded. Furthermore, each receiving groove 132 has a clearance hole 133 at its bottom. Simultaneously, the positioning surface 11221 of the support foot 1122 embedded in the receiving groove 132 is located within the corresponding clearance hole 133. After injection molding, the positioning surface 11221 is flush with the outer surface of the base body 13 at the clearance hole 133. This allows the base body 13 to be injection molded onto the coil frame 11 with the coil 12, where the coil frame 11 with the coil 12 can be placed in the mold of the base body 13. The positioning surface 11221 of the support foot 1122 directly contacts the corresponding position on the inner wall of the mold of the base body 13, achieving positioning and support of the coil frame 11. This ensures a more accurate position of the coil frame 11 in the mold of the base body 13, greater stability during injection molding, consistent stroke of the armature assembly 2 in the product, improved product adjustment efficiency, reduced product defects, and guaranteed insulation performance. Furthermore, the mold of the base body 13 can directly contact the positioning surface 11221 of the support foot 1122, which can form a gap between the bottom of the coil frame 11 and the inner wall of the mold of the base body 13. This facilitates the formation of a base body 13 that wraps around the coil frame 11, without the need for additional positioning and support structures. The structure is simpler, which facilitates injection molding, demolding, and production efficiency. It also avoids material waste and lowers manufacturing costs.

[0024] Specifically, a support foot 1122 is provided on both sides of each end insulation portion 1121, meaning that each end of the coil frame 11 has a corresponding support foot 1122 for support, resulting in more even force distribution and more stable support and positioning. Simultaneously, the two support feet 1122 located on the same end insulation portion 1121 are arranged at intervals, and along the vertical direction, the positioning surfaces 11221 of the two support feet 1122 are located in the same height plane, maintaining the same height of the two support feet 1122. This ensures that the coil frame 11 remains horizontal during injection molding, resulting in higher precision in subsequent injection molding of the base body 13, further guaranteeing the consistency of the armature assembly stroke, leading to a higher product adjustment-free rate, more efficient production, reduced finished product defects, and guaranteed insulation performance, thereby ensuring the product's usability.

[0025] Specifically, a protrusion 1123 is provided on each end insulation portion 1121 and between the two support legs 1122. The thickness of the protrusion 1123 is consistent with the thickness of the protrusion of each support leg 1122, thereby maintaining the flatness of the end insulation portion 1121 and facilitating the subsequent secondary injection molding of the base body 13. In addition, a limiting groove 1124 is formed between the protrusion 1123 and the support legs 1122 on both sides. At this time, a gap is provided between the protrusion 1123 and the support legs 1122 on both sides, forming a limiting groove 1124 through the gap. This allows the end of the coil frame 11 to fit into the injection-molded base body 13, achieving mutual limiting and improving the structural stability and connection reliability of both.

[0026] More specifically, the protrusion 1123 extends downwards, allowing it to have a longer coverage area to accommodate the support legs 1122 of a certain length. Furthermore, the protrusion 1123 separates the two support legs 1122 of a certain length, dividing the space between them into more sections, thus increasing the contact area and providing conditions for more stable injection molding with the base body 13. Additionally, the end of the protrusion 1123 extending downwards is lower than the ends of the corresponding two support legs 1122 extending downwards, creating a height difference between the protrusion 1123 and the two support legs 1122. This provides a limit for the accurate positioning of the support legs 1122 within the mold of the base body 13, resulting in a more rational structural design.

[0027] More specifically, several protruding limiting blocks 134 are provided on the inner wall of the receiving cavity 131 of the base body 13, and each limiting block 134 corresponds to a limiting groove 1124. When the base body 13 is injection molded outside the coil 12 frame, the limiting blocks 134 are embedded into the corresponding limiting grooves 1124. That is, through the cooperation of the limiting blocks 134 and the limiting grooves 1124, the mutual interlocking connection between the coil frame 11 and the base body 13 is further realized, ensuring higher structural stability and reliability of the processed product and ensuring product quality. In addition, a groove 135 is provided between the two limiting blocks 134, that is, there is a gap between the two limiting blocks 134, which forms the groove 135. When the base body 13 is subsequently injection molded outside the coil frame 11, the protrusion 1123 on the end insulation part 1121 is embedded into the groove 135 of the base body 13, which further increases the connection limiting points between the coil frame 11 and the base body 13, and the stability and reliability of the two after injection molding are better.

[0028] More specifically, a contact hole 11241 is provided on the side wall of each limiting groove 1124 at the end opposite to the positioning surface 11221. At the same time, a protruding limiting support is provided on the side of the iron core 111 of the coil frame 11. When the frame body 112 is injection molded outside the iron core 111, the limiting support is located in the end insulation part 1121 of the frame body 112 and at one end of the limiting groove 1124. At this time, the bottom of the limiting support is the limiting surface 1111. After the iron core 111 and the frame body 112 are injection molded, the limiting surface 1111 of the limiting support is located in the contact hole 11241 of the limiting groove 1124 and is flush with the side wall of the groove where the contact hole 11241 is located in the limiting groove 1124. That is, when the coil frame 11 is injection molded, it can be supported in the mold of the frame body 112 by the limiting surface 1111 of the limiting support on the iron core 111, so as to realize the positioning and support of the iron core 111. Similarly, there is no need to add a separate positioning support structure. The structure is simpler, the operation is more convenient, the efficiency is higher, the production cost is lower, and it is beneficial to production and manufacturing.

[0029] More specifically, both sides of the downward-extending end of the protrusion 1123 and both sides of the downward-extending end of the support foot 1122 are provided with narrowing slopes, so that the dimensions of the downward-extending end of the protrusion 1123 and the downward-extending end of the support foot 1122 can gradually decrease, thereby making the bottom opening of the limiting groove 1124 formed by the support foot 1122 and the protrusion 1123 funnel-shaped, which facilitates the material to smoothly and quickly enter into the limiting groove 1124 and completely fill it when the injection base body 13 is injected, ensuring the injection molding effect and making the structural design more reasonable.

[0030] More specifically, a wiring groove 11211 is provided at the bottom of each end insulation part 1121. The wire end of the coil 12 wound on the coil frame 11 can be easily led out and wound around the lead-out foot through the wiring groove 11211, realizing hidden wiring and providing convenience for the subsequent injection molding of the base body 13 on its exterior.

[0031] The electromagnetic relay with injection-molded positioning structure provided in this embodiment includes an armature assembly 2 and an electromagnetic base 1. The electromagnetic base 1 has protruding support feet 1122 on the end insulation portions 1121 at both ends of the coil frame 11, with the support feet 1122 extending downwards. A positioning surface 11221 is provided at one end of the downward-extending support foot 1122. Furthermore, the bottom of the receiving groove 132 of the receiving cavity 131 of the base body 13, which is injection-molded outside the coil frame 11, is provided with a clearance hole 133 that mates with the positioning surface 11221. This allows the receiving groove 132 to be properly positioned. When the coil frame 11 is injected into the outside of the coil frame 11 for the second time, the coil frame 11 can be directly placed into the mold of the base body 13 through the positioning surface 11221 of the support foot 1122 at its end. This realizes the positioning and support of the coil frame 11 in the mold of the base body 13, ensuring the accuracy of the position of the coil frame 11 and the stability during injection molding. It also improves the consistency of the stroke of the armature assembly 2, increases the adjustment-free rate, reduces the defect rate, and ensures the insulation effect. Moreover, there is no need to add an additional positioning support structure. The structure is simple, the operation is convenient, the production efficiency is improved, the waste of materials is avoided, and the manufacturing cost is reduced.

[0032] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electromagnetic relay with an injection-molded positioning structure, comprising an electromagnetic base and an armature assembly, wherein the armature assembly is rotatably mounted on the center of the electromagnetic base, the electromagnetic base comprising a coil frame, a coil, and a base body, the coil being wound on the coil frame, and the base body being injection-molded and encased outside the coil frame on which the coil is wound, characterized in that, The coil bobbin includes an iron core and a bobbin body. The bobbin body wraps around the iron core and forms end insulation portions at both ends of the iron core. Each end insulation portion has a supporting foot protruding from its opposite end face, and each supporting foot extends downward. Each supporting foot has a positioning surface at its downward extending end. The base body has a receiving cavity, and the inner wall of the receiving cavity has a receiving groove corresponding to each supporting foot. Furthermore, each receiving groove has a clearance hole at its bottom. The positioning surface of the supporting foot is located in the corresponding clearance hole and is flush with the outer surface of the base body at the clearance hole.

2. The electromagnetic relay with injection-molded positioning structure according to claim 1, characterized in that, Each end insulation portion has a support foot on both sides, the two support feet are arranged at intervals, and the positioning surfaces of the two support feet are located in the same height plane in the vertical direction.

3. The electromagnetic relay with injection-molded positioning structure according to claim 2, characterized in that, Each of the end insulating portions is provided with a protrusion located between the two support legs, and a limiting groove is formed between the protrusion and the support legs on both sides.

4. The electromagnetic relay with injection-molded positioning structure according to claim 3, characterized in that, The protrusion extends downwards, and the end of the protrusion extending downwards is lower than the end of the corresponding two supporting legs extending downwards.

5. The electromagnetic relay with injection-molded positioning structure according to claim 4, characterized in that, The inner wall of the receiving cavity of the base body is provided with a plurality of protruding limiting blocks, each of the limiting blocks corresponding to a limiting groove. When the base body is wrapped around the coil frame, the limiting block is embedded in the corresponding limiting groove. Furthermore, a groove is provided between two limiting blocks, and the protrusion is embedded in the groove.

6. The electromagnetic relay with injection-molded positioning structure according to claim 5, characterized in that, A contact hole is provided on the side wall of each limiting groove at the end opposite to the positioning surface. A protruding limiting support is provided on the side of the iron core. The bottom of the limiting support is a limiting surface, and the limiting surface is located in the contact hole and is flush with the side wall of the groove where the contact hole is located.

7. The electromagnetic relay with injection-molded positioning structure according to claim 3, characterized in that, Both sides of the downward-extending end of the protrusion and the downward-extending end of the support leg are provided with narrowing slopes.

8. The electromagnetic relay with injection-molded positioning structure according to claim 1, characterized in that, Each of the aforementioned end insulation portions has a wiring groove at its bottom.

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