A subminiature electromagnetic relay

Abstract

This invention discloses an ultra-miniature electromagnetic relay, comprising a coil frame; the coil frame includes a U-shaped iron core, coil winding feet, and a second plastic body; the coil winding feet include coil winding terminals and the solder pad; the two coil winding terminals are formed by cutting and bending approximately 90 degrees from a flat strip of material, with the orientation of the two coil winding terminals opposite to the polar face of the U-shaped iron core. This invention helps to reduce the size of the electromagnetic relay, making the product volume about half that of the fourth generation; it also features convenient winding, reduced risk of wire breakage, increased assembly speed, and increased creepage distance between input and output to improve insulation performance.

Description

Technical Field

[0001] This invention relates to the field of relay technology, and in particular to an ultra-miniature electromagnetic relay. Background Technology

[0002] Miniature electromagnetic relays, due to their small size and low coil power consumption, are widely used in network communications, medical equipment, testing equipment, and other fields requiring dense installation or limited space. Existing miniature electromagnetic relays typically consist of a moving spring armature, a base, and a housing. The moving spring armature is formed by injection molding an armature, a permanent magnet, and a moving spring containing the moving contact. This moving spring armature is welded to the base, and the housing is then attached to form the electromagnetic relay. The base is typically formed by injection molding a coil and a stationary spring with a stationary contact. The volume of the coil plays a crucial role in the overall product size. The coil includes a coil frame, coil leads, and enameled wire. The coil leads are welded to solder tabs in the coil frame, and the enameled wire is wound around the winding window of the coil frame. The coil frame is formed by injection molding a U-shaped iron core and coil winding feet. The U-shaped iron core has its body at the bottom and its legs at the top. During injection molding, the plastic body covers the two legs of the U-shaped iron core to form the flanges at both ends of the coil frame, with the ends of the two legs exposed on the surface of the plastic body to form pole faces. A winding window is formed between the inner walls of the flanges for winding enameled wire. The two coil winding feet are injection molded into one of the flanges. The two coil winding feet serve as coil winding terminals and solder tabs, respectively, exposing the corresponding flanges. The two coil winding terminals serve as the start and end windings, and the two solder tabs are used to connect to the two coil lead-out feet.

[0003] Existing coil bobbins and strips, such as Figure 1 , Figure 2 As shown, the coil frame includes a U-shaped iron core 100, coil winding feet 200, and a plastic body 300 (i.e., flange) that combines the U-shaped iron core 100 and coil winding feet 200 together by injection molding. The outer sections (i.e., coil winding terminals) 202 of the first feet 201 of the two coil winding feet 200 are located on both sides of the width of the coil frame, and are on the same plane as the outer sections (i.e., solder pieces) 204 of the second feet 203 of the coil winding feet 200, and parallel to the pole surface 101 of the U-shaped iron core 100. This existing coil structure has the following main drawbacks: ① The coil winding terminals are parallel to the winding window and distributed on both sides of the coil width, forming a left-right winding structure. Soldering requires two separate processes, achieved by rotating the coil, which makes it difficult to guarantee accuracy, easily burns the plastic, and is inefficient; ② Because the starting winding head is far from the winding window (e.g., ... Figure 3As shown), a lead groove 301 needs to be provided, and the lead groove 301 is located outside the winding window. The opening direction of the lead groove is in the same direction as the product height direction of the iron core pole face, which makes the enameled wire lead on the beginning of the winding head longer and exposed outside the winding window, increasing the risk of wire breakage. ③ The coil winding head terminals are located on both sides of the coil frame width direction, which increases the additional space occupied by the product width and is not conducive to reducing the product size. ④ The coil winding head terminals are the control input terminals of the product. When they are located on both sides of the product width direction, they are located in the middle between the coil lead-out foot 401 and the stationary spring lead-out foot 402 (e.g., Figure 4 As shown), the distance between the lead-out pin A of one of the stationary spring load output terminals on both sides of the product width direction is close, affecting the insulation performance of the input and output terminals. ⑤ The bottom edge of the housing 500 of the ultra-miniature relay usually needs to be provided with a positioning protrusion 501 (such as...). Figure 5 As shown in the figure, due to the small size of the product and the thin walls of the outer shell parts, the positioning protrusions at the bottom edge of the outer shell opening are easy to burn during processing and molding, and are not easy to fill. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an ultra-miniature electromagnetic relay. Through structural improvements, on the one hand, it helps to reduce the size of the electromagnetic relay, making the product volume about half that of the fourth generation; on the other hand, it has the characteristics of convenient winding, reduced risk of wire breakage, increased assembly speed, and increased creepage distance between input and output to improve insulation performance.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: an ultra-miniature electromagnetic relay, comprising a moving spring armature part, a base part, and a housing; the base part includes a coil part, a stationary spring part with stationary contacts, and a first plastic body that integrates the coil part and the stationary spring part into a single unit through injection molding; the coil part includes a coil frame, coil leads, and enameled wire, the coil leads being fixed to solder tabs in the coil frame, and the enameled wire being wound around the winding window of the coil frame; the coil frame includes a U-shaped iron core, two coil winding legs, and a second plastic body that is wound around the two legs of the U-shaped iron core through injection molding to form the flanges at both ends of the coil frame, the two second plastic bodies and the body of the U-shaped iron core forming the winding window; the coil winding legs include coil winding terminals and solder tabs; the orientation of the two coil winding terminals is opposite to the orientation of the pole face of the U-shaped iron core.

[0006] The two coil winding terminals are formed by cutting the same planar strip as the welding sheet and bending it at approximately 90 degrees.

[0007] The coil winding foot includes an integrally connected first foot and second foot, wherein the inner sections of the first foot and the second foot are embedded in a second plastic body that serves as one of the flanges, and the outer sections of the first foot and the second foot serve as the coil winding end terminal and the solder piece, respectively, and expose the corresponding second plastic body; after injection molding, the orientation of the two coil winding end terminals that expose the corresponding second plastic body is opposite to the orientation of the pole face of the U-shaped iron core.

[0008] In the second plastic body, which is one of the flanges, on both sides corresponding to the width of the coil frame, at the position corresponding to the inner section of the first foot, there is also a lateral guide hole for positioning the coil winding terminal when the coil winding foot and the U-shaped iron core are injection molded together, so as to improve accuracy; the lateral guide hole leads to the inner section of the first foot of the coil winding foot embedded in the second plastic body.

[0009] In the second plastic body, which is one of the flanges, a protrusion for guiding the coil winding terminal is provided at the position corresponding to the root of the coil winding terminal, and the edge of the protrusion is chamfered.

[0010] The end of the coil winding terminal is provided with a chamfered structure to achieve the alignment of the coil winding terminal.

[0011] The two coil winding terminals are respectively located on the inner sides of the two edges of the second plastic body corresponding to the width of the coil skeleton; in the second plastic body, which is one of the flanges, on the inner side corresponding to the winding window, a lead groove is provided from the root of one of the coil winding terminals, leading to the bottom of the winding window and corresponding to the position of the other coil winding terminal, so that the lead groove is located inside the winding window.

[0012] The second plastic body, which is one of the flanges, is also provided with a recessed platform, and the lead wire groove is located at the bottom of the recessed platform.

[0013] One end of the lead groove is connected to the root of one of the coil winding terminals, and the other end of the lead groove leads to the body of the U-shaped iron core.

[0014] The stationary spring portion includes a stationary spring lead-out foot that extends outward along the bottom surface of the first plastic body. During injection molding of the first plastic body, the two coil winding terminals of the coil portion are formed in the bottom region of the first plastic body.

[0015] The two coil winding terminals of the coil part protrude from the bottom surface of the first plastic body. At the position corresponding to the two coil winding terminals on the bottom surface of the first plastic body, there is also a boss that completely covers the coil winding terminals and the enameled wire wound on them. There is no positioning protrusion at the bottom edge of the opening of the outer shell, so that the boss can be used to realize the positioning protrusion function of the outer shell.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This invention employs a design where two coil winding terminals are formed by cutting and bending approximately 90 degrees from a flat strip of material, similar to the solder pad. After injection molding, the orientation of the two coil winding terminals exposed in the corresponding second plastic body is opposite to the orientation of the U-shaped iron core's pole face. This structure, with the coil winding terminals facing opposite directions to the U-shaped iron core's pole face, ensures that the coil winding terminals are substantially parallel to the two legs of the U-shaped iron core and substantially perpendicular to its pole face. The coil winding terminals and the two legs of the iron core extend from opposite sides of the second plastic body. Since both coil winding terminals are located on the same side away from the iron core's pole face, simultaneous soldering is possible without coil flipping, simplifying the process, increasing efficiency, and ensuring high precision. Furthermore, the coil winding terminals are located outside the winding window of the coil frame, avoiding the redundant action often required in large relays where the winding head needs to be bent to allow for repositioning before winding and then reset after winding. Furthermore, since the two coil winding terminals are located within the plastic wrapping area of ​​the legs of the U-shaped iron core in the width direction, they do not occupy additional space in the width direction; at the same time, in the length direction, the positions of the two coil winding terminals largely overlap with the pole surface of the iron core, and do not occupy additional space in the length direction, thus achieving the effect of saving volume.

[0018] 2. This invention employs a design where the two coil winding terminals are located on the inner sides of the two edges of the second plastic body corresponding to the width of the coil frame. Within the second plastic body, which serves as one of the flanges, a lead-wire groove is provided at the root of one coil winding terminal, leading to the bottom of the winding window and corresponding to the position of the other coil winding terminal, so that the lead-wire groove is located within the winding window. This structure of the invention ensures that the beginning and end windings of the coil are close to the coil body, reducing the difficulty of setting the winding machine's trajectory. It also significantly shortens the length of the lead wire remaining outside the coil body after winding, with most of the lead wire being shielded and protected by the coil body, reducing the risk of wire breakage.

[0019] 3. In this invention, the second plastic body, which serves as one of the flanges, also includes a recessed platform. The lead groove is located at the bottom of the recessed platform, and one end of the lead groove connects to the root of one of the coil winding terminals. The other end of the lead groove leads to the body of the U-shaped iron core. In this structure, the initial lead groove is located inside the winding window. By setting a recessed platform, the bottom of the lead groove at the bottom of the platform is made to be substantially close to the iron core winding shaft, preventing the enameled wire wound during winding from scratching and damaging the insulation layer of the enameled wire. Simultaneously, the finished coil lead is covered by the coil body, reducing the risk of wire breakage.

[0020] 4. In this invention, during the injection molding of the first plastic body, the two coil winding terminals of the coil portion are formed in the bottom area of ​​the first plastic body, and the two coil winding terminals of the coil portion protrude from the bottom surface of the first plastic body. At the position corresponding to the two coil winding terminals on the bottom surface of the first plastic body, a boss is provided that completely covers the coil winding terminals and the enameled wire wound on them. No positioning protrusion is provided at the bottom edge of the opening of the outer shell, so that the boss can be used to realize the positioning protrusion function of the outer shell. This invention, by moving the coil winding terminal to the bottom of the product, eliminates the insulation deficiency caused by the winding between the stationary spring and the coil lead in the original technology. This increases the creepage distance between the coil input and output springs, improving the product's insulation performance. Furthermore, the coil winding, located on the coil frame away from the iron core pole face, is positioned at the bottom of the base portion when the coil and stationary spring are injection molded together. It is wrapped in plastic to prevent exposure and damage, while also forming a boss on the base portion. This boss can also serve as a positioning protrusion for the product, eliminating the positioning protrusion on the outer shell in the prior art and reducing the difficulty of shell manufacturing.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the ultra-miniature electromagnetic relay of the present invention is not limited to the embodiments. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the coil frame of an ultra-miniature electromagnetic relay in the prior art;

[0023] Figure 2 This is a schematic diagram of the coil winding terminal strip of an existing ultra-miniature electromagnetic relay;

[0024] Figure 3 This is a schematic diagram of the coil section of a conventional ultra-miniature electromagnetic relay;

[0025] Figure 4 This is a schematic diagram of the interaction between the coil portion and the stationary spring portion of an existing ultra-miniature electromagnetic relay;

[0026] Figure 5 This is a three-dimensional structural diagram (bottom facing up) of an existing ultra-miniature electromagnetic relay;

[0027] Figure 6 This is a three-dimensional structural diagram of the coil frame according to an embodiment of the present invention (iron core pole face upward);

[0028] Figure 7 This is a three-dimensional structural diagram of the coil frame according to an embodiment of the present invention (iron core pole face down);

[0029] Figure 8 This is a three-dimensional structural diagram of the coil frame according to an embodiment of the present invention (iron core pole face down and rotated at an angle);

[0030] Figure 9 This is a three-dimensional structural diagram of the coil frame wound with enameled wire according to an embodiment of the present invention (iron core pole face upward);

[0031] Figure 10 This is a three-dimensional structural diagram of the coil frame wound with enameled wire according to an embodiment of the present invention (iron core pole face down);

[0032] Figure 11 This is a three-dimensional structural diagram of a coil frame wound with enameled wire according to an embodiment of the present invention (iron core pole face down and rotated at an angle);

[0033] Figure 12 This is a schematic diagram of the coil winding terminal strip according to an embodiment of the present invention (the coil winding terminal is bent upwards);

[0034] Figure 13 This is a schematic diagram of the coil winding terminal strip and the iron core being integrally formed by injection molding according to an embodiment of the present invention (iron core pole face down);

[0035] Figure 14 This is a schematic diagram of an embodiment of the present invention, in which the coil winding terminal strip and the iron core are integrally formed by injection molding (the iron core pole face is down and rotated at an angle);

[0036] Figure 15 This is a three-dimensional structural diagram of the coil portion and the stationary spring portion cooperating according to an embodiment of the present invention;

[0037] Figure 16 This is a front view of the coil portion and the stationary spring portion assembling in an embodiment of the present invention;

[0038] Figure 17 This is a schematic diagram of an embodiment of the present invention (bottom facing up);

[0039] Figure 18 This is a three-dimensional structural diagram of an embodiment of the present invention (bottom facing upwards and outer shell removed);

[0040] Figure 19 This is a three-dimensional structural diagram of the iron core according to an embodiment of the present invention. Detailed Implementation

[0041] Example

[0042] See Figures 6 to 19As shown, an ultra-miniature electromagnetic relay of the present invention includes a moving spring armature portion (not shown in the figure), a base portion 1, and a housing 2. The base portion 1 includes a coil portion 3, a stationary spring portion 4 with stationary contacts, and a first plastic body 5 that integrates the coil portion and the stationary spring portion into a single unit through injection molding. The coil portion 3 includes a coil frame 6, coil lead-out feet 7, and enameled wire 8. The coil lead-out feet 7 are fixed to solder tabs in the coil frame 6, and the enameled wire 8 is wound in the winding window 60 of the coil frame 6. The coil frame 6 includes a U-shaped iron core 61, two coil winding feet 62, and a second plastic body 63 that is wrapped around the U-shaped iron core 61 by injection molding to form the flanges at both ends of the coil frame. The ends of the two legs 611 protrude from the surface of the second plastic body 63 to form pole surfaces 613. The two second plastic bodies 63 and the U-shaped iron core... The body 612 of 61 forms the winding window 60; the coil winding foot 62 includes an integrally connected first foot 621 and second foot 622, wherein the inner sections 6211 and 6221 of the first foot 621 and the second foot 622 are embedded in the second plastic body 63, which is one of the flanges, and the outer sections of the first foot 621 and the second foot 622 respectively serve as the coil winding terminal 623 and the solder piece 624, exposing the corresponding second plastic body 63; the two coil winding terminals 623 are formed by cutting the same planar strip as the solder piece 624 and bending it at approximately 90 degrees (before bending, the coil winding terminal 623 and the solder piece 624 are in the same plane and intersect at 90 degrees), and the orientation of the two coil winding terminals 623 exposed after injection molding is opposite to the orientation of the pole surface 613 of the U-shaped iron core 61.

[0043] In this embodiment, the second plastic body 63, which is one of the flanges, is provided with a lateral guide hole 631 on both sides corresponding to the width of the coil frame, at the position corresponding to the inner section 6211 of the first foot 621, for positioning the coil winding foot 62 and the U-shaped iron core 61 when they are injection molded together, so as to improve accuracy; the lateral guide hole 631 leads to the inner section 6211 of the first foot 621 of the coil winding foot 62 embedded in the second plastic body 63.

[0044] In this embodiment, the second plastic body 63, which serves as one of the flanges, also has a protruding brim 632 at the position corresponding to the root of the coil winding terminal for guiding the coil winding terminal. The edge of the protruding brim 632 is chamfered. Besides its guiding function, the protruding brim 632 also serves to guide the coil winding terminal due to the design of the wire groove (e.g., Figure 14 The 632 convex bud can also increase the positioning strength of the terminal after molding.

[0045] The present invention may also provide a chamfered structure at the end of the coil winding terminal to achieve the alignment of the coil winding terminal.

[0046] The lateral guide hole 631 and the protruding brim 632 in this invention play an important role. In the prior art, the coil winding terminal and the solder sheet are stamped from the same strip of material, with the coil winding terminal and the solder sheet on the same horizontal plane, and the whole (coil winding terminal and solder sheet) is parallel to the pole surface of the iron core. When the strip and the U-shaped iron core are injection molded into a coil frame strip, the strip plane is located in the parallel direction of the upper and lower mold closing direction, which facilitates the upper and lower positioning of the strip by the mold. The coil winding terminal of this invention is formed by vertically bending the coil winding terminal on the strip of the coil winding terminal and the solder sheet, so that the coil winding terminal and the solder sheet form an overall perpendicular state (e.g. Figure 12 (As shown). Due to the small size of the coil winding terminal, the processing accuracy of the bending dimensions is high. Furthermore, after bending, the coil winding terminal is positioned perpendicular to the mold closing direction, which is not conducive to fixation during injection molding and can easily lead to deformation or positional deviation of the coil winding terminal under pressure from the mold. Therefore, this invention requires adding lateral positioning (setting lateral positioning holes) to the coil frame to allow the mold placement top to correct the bending dimensions of the winding. This invention also provides a chamfer at the opening of the positioning hole where the mold and the winding mate. This chamfer can be on the mold insert, at the tail of the coil winding, or both. This facilitates the alignment of the winding terminal, ensuring the positional accuracy of the winding after injection molding of the coil frame.

[0047] In this embodiment, the two coil winding terminals 623 are respectively located on the inner sides of the two edges of the second plastic body 63 corresponding to the width of the coil skeleton; in the second plastic body 63, which is one of the flanges, on the inner side corresponding to the winding window, a lead groove 633 is provided at the root of one of the coil winding terminals (i.e., the starting winding) leading to the bottom of the winding window and corresponding to the position of the other coil winding terminal, so that the lead groove 633 is located inside the winding window 60.

[0048] In this embodiment, the second plastic body 63, which is one of the flanges, is also provided with a recessed platform 634, and the lead groove 633 is formed at the bottom of the recessed platform 634.

[0049] In this embodiment, one end of the lead groove 633 is connected to the root of one of the coil winding terminals 623, and the other end of the lead groove 634 is led to the body 612 of the U-shaped iron core 61.

[0050] In this embodiment, the static spring portion 4 includes a static spring lead-out foot 41, which extends outward along the bottom surface 51 of the first plastic body 5. When the first plastic body 5 is injection molded, the two coil winding terminals 623 of the coil portion 3 are formed in the bottom region of the first plastic body 5.

[0051] In this embodiment, the two coil winding terminals 623 of the coil portion protrude from the bottom surface 51 of the first plastic body 5. At the position corresponding to the two coil winding terminals 623 on the bottom surface of the first plastic body 5, there is also a boss 52 that completely covers the coil winding terminals and the enameled wire wound on them. There is no positioning protrusion at the bottom edge of the opening of the outer shell 2, so that the boss 52 can be used to realize the positioning protrusion of the outer shell.

[0052] The present invention discloses an ultra-miniature electromagnetic relay, which is formed by cutting two coil winding terminals 623 into strips that are on the same plane as the welding piece 624 and bending them at approximately 90 degrees. The two coil winding terminals 623, which are exposed after injection molding, are oriented in the opposite direction to the pole face 613 of the U-shaped iron core 61. In this structure of the present invention, the orientation of the coil winding terminal 623 is opposite to the orientation of the pole surface 613 of the U-shaped iron core 61. This makes the coil winding terminal 623 substantially parallel to the two legs 611 of the U-shaped iron core 61 and substantially perpendicular to the pole surface 613 of the U-shaped iron core 61. The coil winding terminal 623 and the two legs 611 of the iron core extend from the two opposite surfaces of the second plastic body 63, respectively. Since the two coil winding terminals 623 are located on the same side away from the pole surface 613 of the iron core, they can be soldered simultaneously without the need for the coil to be flipped. The process is simple, efficient, and the accuracy is easy to guarantee. In addition, the coil winding terminal 623 is located outside the winding window 60 of the coil frame, which avoids the unnecessary action of bending the winding head to make room for winding and then resetting it after winding, which is often used in large relays. Furthermore, since the two coil winding terminals 623 are located within the plastic wrapping area of ​​the legs 611 of the U-shaped iron core 61 in the width direction, they do not occupy additional space in the width direction; at the same time, in the length direction, the positions of the two coil winding terminals 623 largely overlap with the iron core pole surface 613, and do not occupy additional space in the length direction, thus achieving the effect of saving volume.

[0053] This invention discloses an ultra-miniature electromagnetic relay, in which two coil winding terminals 623 are respectively located on the inner sides of the two edges of a second plastic body 63 corresponding to the width of the coil frame. In the second plastic body 63, which serves as one flange, on the inner side corresponding to the winding window 60, a lead-wire groove 633 is provided at the root of one coil winding terminal 623, leading to the bottom of the winding window 60 and corresponding to the position of the other coil winding terminal, so that the lead-wire groove 633 is located within the winding window 60. With this structure, the beginning and end windings of the coil are close to the coil body, reducing the difficulty of setting the winding trajectory on the winding machine. It also significantly shortens the length of the lead wire remaining outside the coil body after winding, and most of the lead wire is shielded and protected by the coil body, reducing the risk of wire breakage.

[0054] This invention discloses an ultra-miniature electromagnetic relay. The second plastic body 63, which serves as one of the flanges, also includes a recessed platform 634. A lead groove 633 is formed at the bottom of the recessed platform 634. One end of the lead groove 633 connects to the root of one of the coil winding terminals 623 (i.e., the starting winding terminal), and the other end of the lead groove 633 leads to the body 612 of the U-shaped iron core 61. In this structure, the starting lead groove is located inside the winding window. By setting a recessed platform, the bottom of the lead groove is made substantially close to the iron core winding shaft, preventing the enameled wire wound during winding from scratching and damaging the insulation layer of the enameled wire. Simultaneously, the finished coil lead is covered by the coil body, reducing the risk of wire breakage.

[0055] This invention discloses an ultra-miniature electromagnetic relay. During the injection molding of the first plastic body 5, two coil-wound terminals 623 of the coil portion are formed in the bottom region of the first plastic body 5, and the two coil-wound terminals 623 protrude from the bottom surface 51 of the first plastic body 5. A boss 52, completely covering the coil-wound terminals 623 and their wound enameled wire, is provided on the bottom surface of the first plastic body at a position corresponding to the two coil-wound terminals 623. This eliminates the need for a positioning protrusion at the bottom edge of the outer casing, allowing the boss 52 to serve as the positioning protrusion for the outer casing. This structure, by moving the coil-wound terminals 623 to the bottom of the product, eliminates the insulation deficiency caused by the coil-wound terminals between the stationary spring and the coil lead in the original technology without increasing the product volume. It also increases the creepage distance A between the coil input and output springs (see [reference]). Figure 16This improves the insulation performance of the product; and the coil winding head located on the coil frame away from the iron core pole face, when the coil and the static spring are injection molded together to form the base part, the coil winding head is located at the bottom of the base part, wrapped in plastic to avoid being exposed and damaged, and at the same time forms the boss of the base part. This boss can also be used as the positioning boss of the product, eliminating the positioning boss located on the outer shell in the prior art and reducing the difficulty of the outer shell manufacturing.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A miniature electromagnetic relay, comprising a moving spring armature portion, a base portion, and a housing; the base portion comprising a coil portion, a stationary spring portion with stationary contacts, and a first plastic body integrally formed by injection molding the coil portion and the stationary spring portion; the coil portion comprising a coil frame, coil leads, and enameled wire, the coil leads being fixed to solder tabs in the coil frame, and the enameled wire being wound around a winding window in the coil frame; the coil frame comprising a U-shaped iron core, two coil winding legs, and a second plastic body formed by injection molding two legs wrapped around the U-shaped iron core to constitute the flanges at both ends of the coil frame; the coil winding legs comprising coil winding terminals and the solder tabs; characterized in that: The orientation of the two coil winding terminals is opposite to the orientation of the pole face of the U-shaped iron core; One of the flanges has a second plastic body with a lateral guide hole for positioning the coil winding terminal when the coil winding foot and the U-shaped iron core are injection molded together, so as to improve accuracy.

2. The ultra-miniature electromagnetic relay according to claim 1, characterized in that: The two coil winding terminals are formed by cutting the same planar strip as the welding sheet and bending it at approximately 90 degrees.

3. The ultra-miniature electromagnetic relay according to claim 1, characterized in that: The coil winding foot includes an integrally connected first foot and second foot, wherein the inner sections of the first foot and the second foot are embedded in a second plastic body that serves as one of the flanges, and the outer sections of the first foot and the second foot serve as the coil winding end terminal and the solder piece, respectively, and expose the corresponding second plastic body; after injection molding, the orientation of the two coil winding end terminals that expose the corresponding second plastic body is opposite to the orientation of the pole face of the U-shaped iron core.

4. The ultra-miniature electromagnetic relay according to claim 3, characterized in that: The lateral guiding holes are provided on both sides corresponding to the width of the coil frame, at the position corresponding to the inner section of the first foot; the lateral guiding holes lead to the inner section of the first foot of the coil winding foot embedded in the second plastic body.

5. The ultra-miniature electromagnetic relay according to claim 4, characterized in that: In the second plastic body, which is one of the flanges, a protrusion for guiding the coil winding terminal is provided at the position corresponding to the root of the coil winding terminal, and the edge of the protrusion is chamfered.

6. The ultra-miniature electromagnetic relay according to claim 4 or 5, characterized in that: The end of the coil winding terminal is provided with a chamfered structure to achieve the alignment of the coil winding terminal.

7. The ultra-miniature electromagnetic relay according to claim 3, characterized in that: The two second plastic bodies and the body of the U-shaped iron core form the winding window; the two coil winding terminals are respectively located on the inner sides of the two edges of the second plastic bodies corresponding to the width of the coil frame; in the second plastic body that serves as one of the flanges, on the inner side corresponding to the winding window, a lead groove is provided from the root of one of the coil winding terminals, leading to the bottom of the winding window and corresponding to the position of the other coil winding terminal, so that the lead groove is located inside the winding window.

8. The ultra-miniature electromagnetic relay according to claim 7, characterized in that: The second plastic body, which is one of the flanges, is also provided with a recessed platform, and the lead groove is formed at the bottom of the recessed platform.

9. The ultra-miniature electromagnetic relay according to claim 7 or 8, characterized in that: One end of the lead groove is connected to the root of one of the coil winding terminals, and the other end of the lead groove leads to the body of the U-shaped iron core.

10. The ultra-miniature electromagnetic relay according to claim 1, characterized in that: The stationary spring portion includes a stationary spring lead-out foot that extends outward along the bottom surface of the first plastic body. During injection molding of the first plastic body, the two coil winding terminals of the coil portion are formed in the bottom region of the first plastic body.

11. The ultra-miniature electromagnetic relay according to claim 10, characterized in that: The two coil winding terminals of the coil part protrude from the bottom surface of the first plastic body. At the position corresponding to the two coil winding terminals on the bottom surface of the first plastic body, there is also a boss that completely covers the coil winding terminals and the enameled wire wound on them. There is no positioning protrusion at the bottom edge of the opening of the outer shell, so that the boss can be used to realize the positioning protrusion function of the outer shell.

12. A miniature electromagnetic relay, comprising a moving spring armature portion, a base portion, and a housing; the base portion comprising a coil portion, a stationary spring portion with stationary contacts, and a first plastic body integrally formed by injection molding the coil portion and the stationary spring portion; the coil portion comprising a coil frame, coil leads, and enameled wire, the coil leads being fixed to solder tabs in the coil frame, and the enameled wire being wound around a winding window in the coil frame; the coil frame comprising a U-shaped iron core, two coil winding legs, and a second plastic body formed by injection molding two legs wrapped around the U-shaped iron core to constitute the flanges at both ends of the coil frame; the coil winding legs comprising coil winding terminals and the solder tabs; characterized in that: The orientation of the two coil winding terminals is opposite to that of the pole face of the U-shaped iron core; in the second plastic body, which is one of the flanges, on the inner side corresponding to the winding window, a lead groove is provided from the root of one of the coil winding terminals, leading to the bottom of the winding window and corresponding to the position of the other coil winding terminal, so that the lead groove is inside the winding window.

13. The ultra-miniature electromagnetic relay according to claim 12, characterized in that: The two coil winding terminals are formed by cutting the same planar strip as the welding sheet and bending it at approximately 90 degrees.

14. The ultra-miniature electromagnetic relay according to claim 12, characterized in that: The coil winding foot includes an integrally connected first foot and second foot, wherein the inner sections of the first foot and the second foot are embedded in a second plastic body that serves as one of the flanges, and the outer sections of the first foot and the second foot serve as the coil winding end terminal and the solder piece, respectively, and expose the corresponding second plastic body; after injection molding, the orientation of the two coil winding end terminals that expose the corresponding second plastic body is opposite to the orientation of the pole face of the U-shaped iron core.

15. The ultra-miniature electromagnetic relay according to claim 12, characterized in that: In the second plastic body, which is one of the flanges, a protrusion for guiding the coil winding terminal is provided at the position corresponding to the root of the coil winding terminal, and the edge of the protrusion is chamfered.

16. The ultra-miniature electromagnetic relay according to claim 12 or 15, characterized in that: The end of the coil winding terminal is provided with a chamfered structure to achieve the alignment of the coil winding terminal.

17. The ultra-miniature electromagnetic relay according to claim 14, characterized in that: The two second plastic bodies and the body of the U-shaped iron core form the winding window; the two coil winding terminals are respectively located on the inner sides of the two edges of the second plastic bodies corresponding to the width of the coil frame.

18. The ultra-miniature electromagnetic relay according to claim 17, characterized in that: The second plastic body, which is one of the flanges, is also provided with a recessed platform, and the lead groove is formed at the bottom of the recessed platform.

19. The ultra-miniature electromagnetic relay according to claim 17 or 18, characterized in that: One end of the lead groove is connected to the root of one of the coil winding terminals, and the other end of the lead groove leads to the body of the U-shaped iron core.

20. The ultra-miniature electromagnetic relay according to claim 19, characterized in that: The stationary spring portion includes a stationary spring lead-out foot that extends outward along the bottom surface of the first plastic body. During injection molding of the first plastic body, the two coil winding terminals of the coil portion are formed in the bottom region of the first plastic body.

21. The ultra-miniature electromagnetic relay according to claim 20, characterized in that: The two coil winding terminals of the coil part protrude from the bottom surface of the first plastic body. At the position corresponding to the two coil winding terminals on the bottom surface of the first plastic body, there is also a boss that completely covers the coil winding terminals and the enameled wire wound on them. There is no positioning protrusion at the bottom edge of the opening of the outer shell, so that the boss can be used to realize the positioning protrusion function of the outer shell.

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