Dry reed relay

Abstract

The invention relates to a dry reed relay, and the dry reed relay comprises a winding window which is concavely formed in the middle of a coil rack, and a coil winding is wound in the winding window; coil retaining walls are arranged at the two opposite ends, in the axial direction of the coil winding, of the coil rack, and grooves are formed in the coil retaining walls; the magnetic shielding case comprises a first shielding case body and a second shielding case body; the first shielding cover body and the second shielding cover body are respectively provided with a guide structure, and the guide structures are clamped in the grooves, so that the first shielding cover body and the second shielding cover body are in clearance fit with the coil winding. In the process that the first shielding case body and the second shielding case body are assembled on the coil rack, the guide structure is in contact fit with the groove side wall of the groove so as to play a mounting guide role on the first shielding case body and the second shielding case body, so that the alignment degree of the first shielding case body and the second shielding case body is ensured, the relative dislocation after the first shielding case body and the second shielding case body are assembled is reduced, and the mounting quality of the coil rack is improved. The sealing degree after assembly is obviously improved, and the magnetic interference resistance and the magnetic efficiency of the dry reed relay are improved.

Description

Technical Field

[0001] This application relates to the technical field of electrical control devices, and in particular to a reed relay. Background Technology

[0002] To improve anti-magnetic interference capabilities and magnetic field utilization efficiency, reed relays are typically equipped with magnetic shielding covers. The higher the degree of enclosure and the larger the shielding area, the stronger the anti-magnetic interference capability and the higher the magnetic efficiency of the reed relay. However, a higher degree of enclosure also places higher demands on assembly positioning accuracy, and a larger shielding area has a greater impact on insulation performance.

[0003] In related technologies, reed relays include a reed switch, a coil frame, a coil winding, a magnetic shield, and an injection-molded housing. These components are integrally injection molded onto the coil frame, which houses the magnetic shield. The magnetic shield of the reed relay uses a modular, assembled structure, which originally achieved good sealing. However, because the magnetic shield is directly mounted on the coil winding, the assembly positioning accuracy and insulation performance are limited. This ultimately restricts the improvement of the reed relay's anti-magnetic interference capability and magnetic efficiency, and makes it unsuitable for more advanced injection molding processes. Summary of the Invention

[0004] Therefore, it is necessary to provide a reed relay to address the problems of poor assembly positioning accuracy and insulation performance of traditional technologies, which restrict the anti-magnetic interference capability and magnetic efficiency improvement of reed relays and make them unsuitable for more advanced injection molding processes.

[0005] This application discloses a reed relay, which includes:

[0006] A coil frame, wherein a winding window is recessed in the middle of the coil frame, and a coil winding is wound within the winding window; coil retainers are provided at opposite ends of the coil frame along the axial direction of the coil winding 30, and the coil retainers are provided with grooves; and

[0007] A magnetic shielding cover includes a first shielding cover body and a second shielding cover body. The first shielding cover body and the second shielding cover body are assembled to surround and install on the outer periphery of the coil winding. Both the first shielding cover body and the second shielding cover body are provided with a guiding structure. The guiding structure is snapped into the groove so that the first shielding cover body and the second shielding cover body are in clearance fit with the coil winding.

[0008] In this reed relay, a first shielding cover and a second shielding cover are used to surround the coil winding installed at the winding window of the coil frame. The first shielding cover and the second shielding cover are joined together so that the assembled magnetic shielding cover can provide excellent shielding protection for the entire relay, so as to prevent external magnetic interference from causing the reed relay to malfunction. Based on this, since a groove is formed at the coil retainer of the coil frame, and both the first and second shielding covers are equipped with a guiding structure, during the assembly of the first and second shielding covers onto the coil frame, the guiding structure, by fitting into the groove and contacting the sidewall of the groove, can guide the installation of the first and second shielding covers. This not only ensures the alignment of the first and second shielding covers and reduces their relative misalignment after assembly, but also significantly improves the sealing degree of the assembled magnetic shielding cover, enhances the reed relay's resistance to external magnetic field interference, and improves the magnetic utilization efficiency of the coil winding. It also helps improve the installation stability and anti-loosening effect of the magnetic shielding cover, preventing displacement or loosening due to stress during secondary injection molding or use. Furthermore, the guiding structure and the groove... The groove's fitting structure also ensures the precise installation position of the magnetic shielding cover on the coil frame, allowing both the first and second shielding covers to form and maintain a uniform fit gap with the coil windings. The guide structure is snapped into the groove, ensuring that both the first and second shielding covers fit the coil windings with the gap, avoiding blind cavities. This allows for the subsequent injection molding of the outer casing, filling the gap between the magnetic shielding cover and the coil windings with plastic, achieving denser plastic filling for more reliable insulation and improved insulation performance. Furthermore, the non-contact assembly of the magnetic shielding cover and the coil windings effectively prevents the magnetic shielding cover from directly squeezing or scraping the coil windings, which could cause coil winding breakage, inter-turn short circuits, or other issues affecting insulation performance. It also avoids the problem of uneven coil windings exacerbating the splicing gaps and misalignments, thus reducing the reed relay's resistance to external magnetic interference and magnetic field utilization efficiency.

[0009] The technical solution of this application will be further described below:

[0010] In one embodiment, the guiding structure includes a support plate and a mounting portion. The first shielding cover and the second shielding cover are both connected to the mounting portion through the support plate. The support plate is used to support the mounting portion to be snapped into the groove, so as to guide the installation of the first shielding cover and the second shielding cover.

[0011] In one embodiment, the mounting part includes a mounting piece and a spring piece, the mounting piece being connected to the support piece, and the spring piece being disposed on the mounting piece and having a clearance fit with the support piece;

[0012] The groove has a side slot for the mounting part to be inserted, and the end of the spring piece away from the mounting piece extends toward the side slot, and the spring piece engages with the side wall of the groove.

[0013] In one embodiment, two spring pieces are provided and are respectively installed on opposite sides of the mounting piece, and the two spring pieces are engaged with the side walls of the groove on both sides.

[0014] In one embodiment, the groove sidewall is provided with a beveled portion near the side opening, the beveled portion causing the distance between the two sidewalls of the groove to decrease from the side opening to the middle of the groove.

[0015] At least one of the two spring clips is tilted away from the other, and the spring clip is adapted to engage with the inclined surface.

[0016] In one embodiment, the included angle between the two spring pieces is adjustable.

[0017] In one embodiment, the support piece is clearance-fitted with the bottom wall of the groove.

[0018] In one embodiment, the guiding structure further includes a positioning piece, which is connected to the end of the support piece away from the mounting portion;

[0019] The coil retaining wall is recessed to form a positioning groove, and the positioning piece is installed in the positioning groove.

[0020] In one embodiment, a positioning post protrudes from the bottom wall of the positioning groove, and the positioning piece has a positioning hole, with the positioning post passing through the positioning hole.

[0021] In one embodiment, the positioning post is a frustum structure, and the conical surface of the frustum structure engages with the wall of the positioning hole so that the positioning piece is in clearance fit with the bottom wall of the positioning groove.

[0022] In one embodiment, the first shielding cover and the second shielding cover are arranged in a mirror image, and both include a shielding cover body. At least a portion of the shielding cover body is concealed inside the winding window, and the shielding cover body is fitted with the coil retaining wall with a gap.

[0023] The guiding structure is protruding and disposed on opposite sides of the shield body along the axial direction of the coil winding.

[0024] In one embodiment, at least one of the two shielding bodies is provided with a hook, and at least the other of the two shielding bodies is provided with a latch, wherein the hook is snapped into place with the latch.

[0025] In one embodiment, the shielding cover body has a deformation blocking groove, which is located near the engagement part of the hook and the bayonet.

[0026] In one embodiment, the hook, the latch, and the deformation blocking groove are all disposed near the side portion of the shield body along the axial direction of the coil winding; and / or, the deformation blocking groove is disposed near the latch, and the deformation blocking groove and the latch are disposed on the shield body along the axial direction of the coil winding.

[0027] In one embodiment, the shield body has a bent portion, and the bent portion has an exhaust window.

[0028] In one embodiment, the hooks are distributed on the same side of the first shielding cover or the second shielding cover along the first direction of the magnetic shielding cover, and the slots are distributed on the opposite side of the first shielding cover or the second shielding cover along the first direction.

[0029] In one embodiment, the reed relay further includes a reed switch and an injection-molded housing, wherein the reed switch, the coil frame on which the coil winding is wound, the magnetic shield and the injection-molded housing are integrally injection molded.

[0030] In one embodiment, the reed switch includes a glass housing and a reed lead. A reed assembly is encapsulated inside the cavity of the glass housing. The reed assembly and the encapsulation of the glass housing are sealed by a sintering process to form a sintered section. One end of the reed lead is connected to the reed assembly, and the other end extends out of the glass housing from the sintered section, passes through the coil retainer, and extends to the outer surface of the coil frame. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of a reed relay with a partial cross-section, as described in one embodiment.

[0034] Figure 2 for Figure 1 A schematic diagram of the structure of a reed relay without the injection-molded housing.

[0035] Figure 3 This is a schematic diagram of the assembly structure of a magnetic shielding cover according to one embodiment.

[0036] Figure 4 for Figure 3 A schematic diagram of the structure of the first shielding cover.

[0037] Figure 5 for Figure 3 A schematic diagram of the structure of the second shielding cover.

[0038] Figure 6 This is a schematic diagram of the structure in one embodiment where the first shielding cover is assembled onto the coil frame.

[0039] Figure 7 for Figure 2 A top-view structural diagram.

[0040] Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure at point AA.

[0041] Figure 9 for Figure 7 A schematic diagram of the cross-sectional structure at point BB.

[0042] Figure 10 This is a cross-sectional structural diagram of the coil frame and reed switch assembly in one embodiment.

[0043] Explanation of reference numerals in the attached figures:

[0044] 100. Reed relay; 10. Coil frame; 11. Winding window; 12. Coil retainer; 121. Groove; 121a. Side slot; 121b. Beveled part; 122. Positioning slot; 123. Positioning post; 20. Magnetic shield; 21. First shield body; 22. Second shield body; 20a. Shield body; 21a. Deformation barrier groove; 22a. Bending part; 221a. Exhaust window; 20b. Guiding structure; 21b. Support piece; 22b. Mounting piece; 23b. Spring piece; 24b. Positioning piece; 241b. Positioning hole; 20c. Hook; 20d. Bayonet; 30. Coil winding; 40. Injection molded housing; 50. Reed switch; 51. Glass housing; 52. Sintered section; 53. Reed lead. Detailed Implementation

[0045] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0046] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0047] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0049] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0051] In related technologies, the magnetic shield 20 in the reed relay 100 is directly mounted on the coil winding 30, which limits the assembly positioning accuracy, insulation effect, and process adaptability, ultimately restricting the improvement of anti-magnetic interference capability, magnetic efficiency, and insulation performance. Specifically, this is reflected in the following aspects:

[0052] Firstly, the assembly positioning accuracy is low: due to the uneven surface of the coil winding 30 and the different sizes of the coil winding 30 depending on the coil voltage, in order to avoid interference after the magnetic shielding cover 20 is assembled, the two parts of the magnetic shielding cover 20 need to reserve sufficient splicing gaps, which will lead to large splicing gaps and poor consistency. In addition, it is also difficult to position the magnetic shielding cover 20 on the coil winding 30, and the alignment after splicing is difficult to guarantee. Ultimately, these factors will affect the shielding effect of the reed relay 100 on external magnetic field interference and the utilization rate of the coil magnetic field.

[0053] Secondly, the insulation is poor: the magnetic shield 20 is in direct contact with the coil winding 30, with only the insulation layer of the enameled wire acting as a barrier. The magnetic shield 20 and the coil winding 30 are approximately short-circuited, making the magnetic shield 20 a potential path for insulation failure between the coil and the contacts. Differences in expansion / contraction caused by assembly or temperature will cause the magnetic shield 20 to compress the coil winding 30, damaging the enameled wire insulation layer and leading to inter-turn short-circuit failure of the coil winding 30.

[0054] Thirdly, the process adaptability is narrow: The contact area between the magnetic shielding cover 20 and the coil winding 30 has a blind cavity (caused by the unevenness of the coil winding 30), and the magnetic shielding cover 20 has no positional constraints in any direction. It is mainly suitable for traditional potting processes and cannot meet the requirements of injection molding processes, although injection molding is superior to potting in terms of assembly consistency and production efficiency. This is because: 1) the gas in the blind cavity expands when heated, hindering plastic filling and creating injection molding cavities or bulge defects, affecting the product's insulation and appearance; 2) the magnetic shielding cover 20 may shift or deform due to the scouring effect of the plastic. Shifting can cause scratches, leading to broken wires or short circuits between turns in the coil winding 30, while deformation will exacerbate the splicing gaps and misalignments, reducing the anti-magnetic interference capability and magnetic efficiency.

[0055] Fourthly, there are shielding dead angles: the traditional magnetic shielding cover 20 is completely open on the side, which creates shielding dead angles at this location and also affects the utilization rate of the magnetic field.

[0056] To address the aforementioned problems, this application proposes a novel reed relay 100 structure, please refer to the following for details. Figures 1 to 3 The present embodiment illustrates a reed relay 100, which includes a coil holder 10 and a magnetic shield 20.

[0057] Please continue reading. Figures 7 to 9 In addition, the reed relay 100 also includes a reed switch 50, and there are two reed switches 50. The main body of the two reed switches 50 is encapsulated inside the coil frame 10, except that the reed lead 53 of the reed switch 50 extends to the outside of the coil frame 10 for electrical connection with external load devices such as PCBs.

[0058] Optionally, in this application, the coil frame 10 and the reed switch 50 are integrally injection molded, and then the reed lead 53 is cut, bent, or subjected to other post-processing. The advantages of this design are: it avoids the risks of mechanical stress damage to the seal and parameter changes caused by directly bending, cutting, or welding the reed lead 53 during the direct processing of the bare reed switch 50; it also solves a series of problems such as: poor vibration resistance in the insertion fit between the reed switch 50 and the coil frame 10; random position of the reed switch 50 within the coil frame 10; poor coil suction uniformity; poor sealing due to the use of sleeves or potting compound to isolate the reed switches 50; unstable insulation performance; uneven heat dissipation; complex processing technology; difficulty in automation; and difficulty in ensuring assembly consistency.

[0059] Furthermore, the two reed switches 50 are symmetrically distributed within the coil frame 10 to ensure the balance of the electromagnetic attraction force, thereby improving the synchronization during operation.

[0060] Please continue reading. Figure 2 , Figures 8 to 9Furthermore, in this application, a winding window 11 is recessed in the middle of the coil frame 10, and a coil winding 30 is wound inside the winding window 11. The winding window 11 is an annular notch structure so that the coil winding 30 can be continuously wound around the coil frame 10 in a full turn.

[0061] It should be noted that the coil winding 30 after winding should not extend beyond the outside of the winding window 11 to avoid interference with the subsequent assembly of the magnetic shield 20 onto the coil frame 10.

[0062] Please continue reading. Figure 2 , Figure 3 ,as well as Figures 6 to 8 The coil frame 10 has coil retainers 12 at both ends of the coil winding 30 along the axial direction. The coil retainers 12 have grooves 121. In other words, since the winding window 11 is recessed in the middle of the coil frame 10, the flange structure left at both ends of the coil frame 10 along the axial direction forms the coil retainers 12, which makes the forming method of the coil retainers 12 simple and the structural performance good.

[0063] Combination Figure 10 In this application, the reed switch 50 includes a glass housing 51 and a reed lead 53. A reed assembly (not shown in the figure) is encapsulated within the cavity of the glass housing 51. Reed switches 50 are generally classified into normally open and normally closed types. The normally open type reed switch 50 is used in the reed relay 100. When the coil winding 30 is energized, the coil winding 30 generates a magnetic field, magnetizing the reed assembly. The reed contacts form opposite magnetic poles, and due to the attraction of opposite poles, they overcome the reed assembly's own elasticity to close the contact, thus completing the circuit. When the coil winding 30 is de-energized, the reed assembly can return to its original state based on its own elasticity, the contacts separate, and the circuit is broken. The normally closed type reed switch 50 is used in the reed relay 100. When the coil winding 30 is not energized, the reed contacts close, completing the circuit; when the coil winding 30 is energized, the magnetic field generated by the coil winding 30 causes the contacts to open, breaking the circuit.

[0064] Therefore, in actual use, the external magnetic field of the reed relay 100 will affect the reed magnetic field of the reed relay 100, such as magnetizing the reed or canceling the magnetic field passing through the reed, which will cause the reed in the reed switch 50 to malfunction and affect the working reliability of the reed relay 100.

[0065] The encapsulation of the reed assembly and the glass housing 51 is sealed by a sintering process to form a sintered section 52, thereby improving the connection strength and sealing performance. One end of the reed lead 53 is connected to the reed assembly, and the other end extends out of the glass housing 51 from the sintered section 52, then passes through the coil retainer 12 and extends to the outer surface of the coil frame 10.

[0066] The magnetic shield 20 includes a first shield 21 and a second shield 22. The first shield 21 and the second shield 22 are assembled to surround and install on the outer periphery of the coil winding 30. Both the first shield 21 and the second shield 22 are provided with a guiding structure 20b, which is snapped into the groove 121 so that the first shield 21 and the second shield 22 are in clearance fit with the coil winding 30.

[0067] It should also be noted that the reed relay 100 includes an injection-molded housing 40 formed on the outside of the magnetic shielding cover 20 and the coil frame 10. In other words, the reed relay 100 also includes a reed switch 50 and an injection-molded housing 40, with the reed switch 50, the coil frame 10 with the coil winding 30 wound around it, the magnetic shielding cover 20, and the injection-molded housing 40 integrally injection-molded. The manufacturing process is simple, the connection strength of the various components is high, the robustness is good, and the durability is excellent.

[0068] In summary, the technical solution of this embodiment will achieve the following beneficial effects: In the reed relay 100 of this embodiment, a first shielding cover 21 and a second shielding cover 22 are used to surround the outside of the coil winding 30 installed at the winding window 11 of the coil frame 10, and the first shielding cover 21 and the second shielding cover 22 are spliced ​​together, so that the assembled magnetic shielding cover 20 can form excellent shielding protection for the entire relay, so as to prevent external magnetic field interference from causing the reed relay 100 to malfunction. Based on this, since a groove 121 is formed at the coil retainer 12 of the coil frame 10, and both the first shielding cover 21 and the second shielding cover 22 are provided with a guiding structure 20b, during the assembly of the first shielding cover 21 and the second shielding cover 22 onto the coil frame 10, the guiding structure 20b, by inserting into the groove 121 and contacting and engaging with the sidewall of the groove 121, can play a guiding role in the installation of the first shielding cover 21 and the second shielding cover 22. In this way, not only can the alignment of the first shielding cover 21 and the second shielding cover 22 be guaranteed, and the relative misalignment after assembly be reduced, but it also helps to significantly improve the sealing degree of the assembled magnetic shielding cover 20, improve the anti-external magnetic field interference capability of the reed relay 100 and the magnetic utilization efficiency of the coil winding 30, it also helps to improve the installation stability and anti-loosening effect of the magnetic shielding cover 20, and prevent the magnetic shielding cover 20 from shifting or loosening due to force during secondary injection molding or use; in addition, the guiding structure 20b The mating structure of guide structure 20b with groove 121 also ensures the installation position accuracy of magnetic shield 20 on coil frame 10, so that both the first shield 21 and the second shield 22 can form and maintain a uniform mating gap with coil winding 30. The guide structure 20b is snapped into groove 121 so that both the first shield 21 and the second shield 22 can fit with coil winding 30 with a gap, avoiding blind cavities. This allows for the filling of plastic into the gap between magnetic shield 20 and coil winding 30 during subsequent shell injection molding, achieving denser plastic filling to obtain more reliable insulation barrier and improve insulation performance. In addition, the non-contact assembly of magnetic shield 20 and coil winding 30 can effectively avoid direct squeezing or scratching of coil winding 30 by magnetic shield 20, which could cause coil winding 30 to break or short circuit between turns, affecting insulation performance. At the same time, it avoids the problem of unevenness of coil winding 30, which would aggravate splicing gaps and misalignment, thereby reducing the anti-external magnetic interference capability and magnetic field utilization efficiency of reed relay 100.

[0069] It should be noted that the magnetic shielding cover 20 and the coil winding 30 are approximately equally spaced in all directions of the reed relay 100 to ensure that the plastic wall thickness of the injection molding is uniform and consistent, thereby achieving better insulation barrier effect in all directions.

[0070] Please continue reading. Figures 3 to 8Furthermore, based on the above embodiments, the first shielding cover 21 and the second shielding cover 22 are arranged in a mirror image configuration. That is, the first shielding cover 21 and the second shielding cover 22 are essentially the same part. Therefore, by assembling the first shielding cover 21 and the second shielding cover 22 in a mirror image configuration, a nearly coaxial magnetic shielding cover structure can be formed, thereby improving assembly accuracy and consistency. Simultaneously, it can reduce the number of parts, lower installation difficulty, and reduce material costs.

[0071] More specifically, both the first shielding cover 21 and the second shielding cover 22 include a shielding cover body 20a, at least a portion of which is concealed inside the winding window 11, meaning the shielding cover body 20a does not extend beyond the coil retaining wall 12. Furthermore, the shielding cover body 20a and the coil retaining wall 12 are fitted with a clearance.

[0072] The guiding structure 20b protrudes and is located on opposite sides of the shield body 20a along the axial direction.

[0073] For example, in this application, the shielding cover body 20a is a U-shaped metal plate, which has a simple structure and is easy to process and form. Of course, in other optional embodiments, the shielding cover body 20a can also be a semi-circular structure, etc., and can be flexibly selected according to actual needs.

[0074] Two U-shaped metal plates are joined together at their openings to form a circumferentially closed cylindrical magnetic shield 20. This magnetic shield 20 completely surrounds the outer periphery of the coil winding 30 mounted on the coil frame 10, providing a tight seal and thus enhancing resistance to external magnetic field interference and improving the coil's magnetic field utilization efficiency. The magnetic shield 20 also provides excellent heat dissipation, allowing the device to quickly reach thermal equilibrium. This reduces the internal and external temperature gradient of the reed relay 100 caused by external environmental factors, load / coil winding 30 temperature rise, etc., preventing damage to the reed relay 100's performance and appearance due to rapid temperature stress.

[0075] Furthermore, since the shield body 20a and the two coil retainers 12 at both ends of the coil winding are assembled with a gap fit, the gap at one end of the axial direction can be used as a plastic filling inlet, and the gap at the other end of the axial direction can be used as an exhaust window 221a, ensuring that the molten plastic can smoothly fill the gap between the magnetic shield 20 and the coil winding 30, thereby ensuring the quality of injection molding.

[0076] Furthermore, by arranging the guiding structure 20b on opposite sides of the shielding body 20a along its axial direction, compared to conventional technology, the guiding structure 20b can increase the sealing degree of the magnetic shielding cover 20, improving the magnetic shielding effect and magnetic efficiency in the lateral position. In other words, the lateral guiding structure 20b provides magnetic interference shielding protection in the lateral position; it also shortens the distance between the magnetic shielding cover 20 and the reed switch 50, thereby reducing magnetic flux leakage in the lateral position and improving magnetic field utilization efficiency.

[0077] Please continue reading. Figures 3 to 5 In order to facilitate the installation and disassembly of the first shielding cover 21 and the second shielding cover 22, and to ensure the overall structural strength and stability of the magnetic shielding cover 20 after assembly, in an optional embodiment, at least one of the two shielding cover bodies 20a is provided with a hook 20c, and at least the other of the two shielding cover bodies 20a is provided with a latch 20d, and the hook 20c and the latch 20d are connected by a snap fastener.

[0078] In other words, during assembly, the first shielding cover 21 and the second shielding cover 22 are installed onto the coil frame 10 in a facing-to-facing manner, so that the corresponding hooks 20c engage with the slots 20d, thereby completing the assembly and fixation of the first shielding cover 21 and the second shielding cover 22. The assembly structure and operation method are simple and highly feasible. In addition, this snap-fit ​​connection method can also improve the overall rigidity of the magnetic shielding cover 20 after assembly and increase its resistance to injection molding erosion damage: by assembling the separately set first shielding cover 21 and second shielding cover 22 into a single structure, the overall rigidity of the magnetic shielding cover 20 can be effectively improved, and its resistance to plastic erosion deformation can be increased. This reduces the risk of increased splicing gaps, aggravated misalignment, and poor consistency of the gap between the magnetic shielding cover 20 and the coil winding 30 caused by deformation of the magnetic shielding cover 20, ultimately ensuring the magnetic shielding effect, magnetic efficiency, and injection molding quality of the reed relay 100. In addition, the physical connection between the first shielding cover 21 and the second shielding cover 22 can also enhance the magnetic shielding and magnetic efficiency: the hook 20c can serve as a physical connection channel for the magnetic field of the two magnetic shielding covers, further compensating for the magnetic flux leakage problem caused by the splicing gap, and ensuring the magnetic shielding effect and magnetic efficiency of the product.

[0079] Optionally, the two sides of the bent edge of the shield body 20a of the first shield body 21 are respectively provided with hooks 20c and latches 20d, and the two sides of the bent edge of the shield body 20a of the second shield body 22 are respectively provided with latches 20d and hooks 20c. During assembly, the hooks 20c and latches 20d at several locations are simultaneously engaged, which helps to further improve the assembly strength of the first shield body 21 and the second shield body 22.

[0080] Please see Figure 3 and combined Figure 4 and Figure 5 It should be noted that the hooks 20c in this application are distributed on the same side of the first shielding cover 21 or the second shielding cover 22 along the first direction of the magnetic shielding cover 20, and the slots 20d are distributed on the opposite side of the first shielding cover 21 or the second shielding cover 22 along the opposite side of the first direction. For example, the first direction is specifically... Figure 3 The direction of arrow S in the diagram.

[0081] This configuration ensures that the side plates of the first shielding cover 21 and the second shielding cover 22 are subjected to the same direction of the two clamping and pressing forces. It avoids the situation where the hooks 20c and the slots 20d are placed on the same side plate, causing the two clamping and pressing forces to be in opposite directions and to produce a torsional effect on the side plate. This would exacerbate the degree of splicing misalignment (the side plate deformation direction generated by the same-direction pressing force is in the height direction of the side plate, while the side plate deformation generated by the opposite pressing force is along the length direction. Under the same amount of pressing deformation, the misalignment formed at the splice in the height direction is smaller than that in the length direction), ultimately affecting the shielding effect and magnetic efficiency of the magnetic shielding cover 20.

[0082] Please continue reading. Figures 3 to 5 More specifically, in this application, the first magnetic shield 20 body and the second shield 22 are connected by a total of four sets of hooks 20c and snap-fits 20d, which are evenly distributed in a rectangular structure. This not only improves the assembly strength but also ensures that the connection fastening force is consistent, avoiding the problem of excessive gaps in local assembly.

[0083] Please continue reading. Figure 5 Furthermore, based on any of the above embodiments, the shielding cover body 20a is provided with a deformation blocking groove 21a, which is located near the engagement portion of the hook 20c and the latch 20d. By providing the deformation blocking groove 21a, the deformation generated by the snap-fit ​​engagement can be controlled locally, thereby blocking the deformation and ensuring a uniform gap between the non-snap-fit ​​portion of the magnetic shielding cover 20 and the coil winding 30, thus improving the injection molding quality. Simultaneously, the deformation blocking groove 21a also helps the hook 20c and the latch 20d to undergo the necessary deformation for assembly.

[0084] Furthermore, in this application, the hook 20c, the latch 20d, and the deformation blocking groove 21a are all located near the side portion of the shielding cover body 20a along the axial direction of the coil winding 30. That is, the deformation blocking groove 21a is not located in the middle. The contacts of the reed switch 50 are located in the middle of the coil frame 10 along the axial direction of the coil winding 30, which helps to ensure the shielding of external magnetic fields from interfering with the reed assembly inside the reed switch 50, i.e., preventing malfunction due to external magnetic interference. In addition, the snap-fit ​​connection structure improves the strength of the edge of the shielding cover body 20a, preventing injection molding deformation and improving injection molding quality.

[0085] And / or, the deformation blocking groove 21a is arranged close to the bayonet 20d, and the deformation blocking groove 21a and the bayonet 20d are arranged along the axial direction of the coil winding 30 on the shield body 20a. By arranging the deformation blocking groove 21a close to the bayonet 20d, when the hook 20c is engaged in the bayonet 20d, causing deformation at the bayonet 20d, the deformation stress can be released in the deformation blocking groove 21a. This forms the deformation blocking groove 21a, which blocks the deformation locally at the engagement point, preventing the deformation from being conducted to the main body of the first shield body 21 and the second shield body 22. This ensures the structural stability of the first shield body 21 and the second shield body 22, thereby ensuring that the gap between the magnetic shield 20 and the coil winding 30 is uniform. The deformation blocking groove 21a and the bayonet 20d are arranged along the axial direction of the coil winding 30. This not only enables the bayonet 20d to provide more effective protection for the deformation blocking groove 21a and avoids cracking after the hook 20c and the bayonet 20d are engaged, but also makes full use of the dimensions of the first shielding cover 21 and / or the second shielding cover 22 along the axial direction of the coil winding 30, which is beneficial to the miniaturization design of the magnetic shielding cover 20.

[0086] Please continue reading. Figure 2 , Figure 4 , Figure 7 and Figure 8 In one optional embodiment of this application, the guiding structure 20b includes a support piece 21b and a mounting portion, and the first shielding cover 21 and the second shielding cover 22 are connected to the mounting portion through the support piece 21b.

[0087] The support piece 21b is used to support the mounting part to snap into the groove 121, so as to guide the installation of the first shielding cover 21 and the second shielding cover 22.

[0088] The support piece 21b extends into the center of the groove 121, so that when the first shielding cover 21 and the second shielding cover 22 are assembled, the mounting part can be more effectively supported to extend into the groove 121 and engage with the side wall of the groove 121, so as to realize the function of the guide structure 20b in guiding and fixing the installation of the first shielding cover 21 and the second shielding cover 22.

[0089] Please continue reading. Figure 4 , Figure 6 and Figure 7 Furthermore, based on the above embodiments, the mounting part includes a mounting piece 22b and a spring piece 23b. The mounting piece 22b is connected to the support piece 21b, and the spring piece 23b is disposed on the mounting piece 22b and has a clearance fit with the support piece 21b.

[0090] The groove 121 has a side slot 121a for the mounting part to be inserted, and the end of the spring piece 23b away from the mounting piece 22b extends toward the side slot 121a, and the spring piece 23b engages with the side wall of the groove 121.

[0091] A spring clip 23b is provided on the mounting piece 22b. When the support piece 21b supports the mounting piece 22b and the spring clip 23b as they are inserted into the groove 121, the spring clip 23b undergoes elastic contraction and deformation, which allows it to lock tightly against the side wall of the groove 121. At the same time, the spring clip 23b and the side wall of the groove achieve a better engagement area, which helps to obtain a better guiding effect, ensures the alignment of the first shielding cover 21 and the second shielding cover 22 after assembly, reduces misalignment at the splicing point, and improves the sealing degree. Meanwhile, the interference fit between the spring clip 23b and the side wall of the groove 121 can play a role in preventing loosening. The interference amount can be adjusted by the included angle between the two spring clips 23b, which prevents the magnetic shielding cover from shifting or loosening under force, thus increasing the splicing gap and affecting the magnetic shielding effect and magnetic efficiency.

[0092] It is easy to understand that the spring piece 23b and the support piece 21b are fitted with a clearance, that is, the connection between the spring piece 23b and the support piece 21b is avoided, thereby avoiding the support piece 21b restricting the elastic deformation of the spring piece 23b and ensuring the elastic clamping performance of the spring piece 23b adapting to the groove sidewall of the groove 121.

[0093] Optionally, based on the above embodiment, two spring pieces 23b are provided, and they are respectively installed on opposite sides of the mounting piece 22b. The two spring pieces 23b are engaged with the side walls of the grooves 121. In this way, the guiding structure 20b can obtain better guiding and engaging anti-loosening effects, and improve the assembly accuracy and quality of the magnetic shielding cover 20 and the coil frame 10.

[0094] Optionally, the two springs 23b are symmetrically distributed, which can not only reduce the manufacturing difficulty of the guiding structure 20b, but also ensure that the two springs 23b are in uniform contact with the side walls of the slots on both sides, thus ensuring the alignment of the first shielding cover 21 and the second shielding cover 22.

[0095] For example, the mounting part, support plate 21b, and shielding cover body 20a can be an integral structure or detachable assembly, which can be flexibly selected according to actual needs. Optionally, in this application, the three adopt an integral structure, which on the one hand ensures the overall structural strength, and on the other hand reduces the number of parts and improves the production efficiency of reed relay 100.

[0096] Please continue reading. Figures 6 to 7 Furthermore, in one embodiment, the groove sidewall of the groove 121 is provided with a beveled portion 121b near the side groove opening 121a. The beveled portion 121b causes the distance between the two sidewalls of the groove 121 to decrease in the direction from the side groove opening 121a to the middle of the groove 121.

[0097] At least one of the two spring clips 23b is tilted away from the other, and the spring clip 23b is adapted to engage with the inclined surface 121b.

[0098] Specifically, both spring pieces 23b are inclined away from each other, and both sides of the groove 121 have inclined surfaces 121b, so that a portion of the groove 121 from the side opening 121a to the middle of the groove 121 forms a flared structure. This allows the guiding structure 20b to be more easily inserted into the groove 121 through the side opening 121a when the magnetic shield 20 is assembled onto the coil frame 10. Under the squeezing action of the inclined surfaces 121b, the spring piece 23b can produce a linear deformation with a gradually increasing deformation range, making it easier for the spring piece 23b to elastically deform and then elastically engage with the corresponding groove sidewall, thus improving the assembly effect between the guiding structure 20b and the groove 121.

[0099] It should be noted that the included angle between the two spring pieces 23b in this application is adjustable. By flexibly adjusting the included angle of the two spring pieces 23b, the interference fit between the spring piece 23b and the side wall of the groove can be controlled, so that the guiding structure 20b can be adapted to the assembly needs of grooves 121 of different sizes. This avoids the magnetic shielding cover 20 from shifting or loosening under force due to insecure installation, which would increase the splicing gap and affect the magnetic shielding effect and magnetic efficiency.

[0100] As is easily understood, the spring 23b is made of metal, so its tilt angle can be directly adjusted by bending. Alternatively, a telescopic mechanism can be connected between the two springs 23b, and the tilt angle of the springs 23b can be adjusted by operating the telescopic mechanism to pull or push the two springs 23b, etc.; the choice can be made flexibly according to actual needs, and no specific limitation is made here.

[0101] It should also be noted that, in another embodiment, after the guiding structure 20b and the groove 121 are assembled in place, the support piece 21b and the bottom wall of the groove 121 are fitted with a gap. This arrangement can improve the insulation barrier effect between the coil winding 30 and the contacts: the gap between the support piece 21b and the bottom wall of the groove 121 is used for plastic filling, avoiding full-surface contact between the support piece 21b and the groove 121, thereby reducing the risk of insulation degradation between the coil winding 30 and the contacts along the interface of the two injection molding processes (under high voltage, free electrons inside the plastic break free from their binding and migrate to the interface, accumulating charge at the interface and causing insulation failure).

[0102] Please continue reading. Figure 2 , Figure 4 , Figure 7 and Figure 8Furthermore, based on any of the above embodiments, the guiding structure 20b also includes a positioning piece 24b, which is connected to the end of the support piece 21b away from the mounting portion. That is, one end of the positioning piece 24b is connected to the shielding cover body 20a, and the other end of the positioning piece 24b is connected to the support piece 21b.

[0103] The coil retaining wall 12 is recessed to form a positioning groove 122, and the positioning piece 24b is installed in the positioning groove 122.

[0104] The positioning groove 122 can be used to make way for the positioning piece 24b, so that the positioning piece 24b can be hidden in the positioning groove 122 along the radial direction of the magnetic shield 20. The coil baffle 12 blocks the impact of the plastic melt during injection molding, so as to prevent the magnetic shield 20 from being deformed by force during the one-piece injection molding of the shell, thus affecting the injection molding quality.

[0105] Furthermore, based on the above embodiment, a positioning post 123 is formed by protruding from the bottom wall of the positioning groove 122, and a positioning hole 241b is opened on the positioning piece 24b, with the positioning post 123 passing through the positioning hole 241b. That is, the first shielding cover 21 and the second shielding cover 22 can be assembled with positioning pins 123 and positioning holes 241b on opposite sides along the axial direction of the coil winding 30 to form a fully constrained "axis-hole" assembly effect. The combined effect of the guiding structure 20b and the positioning pins 123 and positioning holes 241b can improve the installation position accuracy of the magnetic shielding cover 20 on the coil frame 10, and ensure the stability and position accuracy of the magnetic shielding cover 20 after assembly with the coil frame 10. This ensures that the magnetic shielding cover 20 maintains a uniform gap with the coil retaining walls 12 on both sides of the coil frame 10 along the axial direction of the coil winding 30, and that the magnetic shielding cover 20 maintains a uniform gap with the coil winding 30. During injection molding, this allows the molten plastic to smoothly fill the gap between the magnetic shielding cover 20 and the coil winding 30, thereby improving the insulation and protection performance of the reed relay 100.

[0106] Furthermore, in one embodiment, the positioning post 123 is a frustum structure, and the conical surface of the frustum structure engages with the wall of the positioning hole 241b so that the positioning piece 24b and the bottom wall of the positioning groove 122 are in clearance fit. In other words, the shaft-hole floating fit constructed by the frustum and the positioning hole 241b can reduce the risk of insulation failure along the interface. That is, the fit between the positioning hole 241b and the frustum prevents the positioning piece 24b from contacting the entire surface of the coil retainer 12, thereby reducing the risk of insulation degradation between the coil winding 30 and the contact point along the interface of the two injection molding processes (under voltage stress, free electrons inside the plastic break free from their binding and migrate to the interface, accumulating charge at the interface and causing insulation failure). In addition, the fully constrained shaft-hole fit can also significantly improve the injection molding quality and improve the insulation effect: First, it can ensure the positional accuracy of the magnetic shield 20 on the coil frame 10, thereby controlling the consistency of the gap between the magnetic shield 20 and the coil winding 30 in all directions, so as to achieve dense filling of plastic (the magnetic shield 20 can use its own thermal conductivity and surface flatness to reduce the plastic filling speed gradient of the inner wall of the mold cavity and the surface of the winding during the injection molding process, reducing injection molding defects such as cavities and delamination caused by the filling speed gradient, thus affecting the filling density), and finally achieving reliable insulation barrier. Secondly, the non-contact assembly between the magnetic shield 20 and the coil winding 30 can effectively prevent the magnetic shield 20 from directly squeezing or scratching the coil winding 30.

[0107] Please continue reading. Figures 3 to 5 In another embodiment, the shielding cover body 20a has a bent portion 22a, and the bent portion 22a has an exhaust window 221a. The exhaust window 221a is located on the side bent portion 22a, where the plastic wall thickness is relatively thick and the filling difficulty is relatively small. The exhaust window 221a can not only meet the need for venting during injection molding, but also avoid obvious shrinkage marks or cracking defects caused by uneven curing or cooling after a sudden change in plastic wall thickness.

[0108] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0109] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A reed relay, characterized in that, include: A coil frame, wherein a winding window is recessed in the middle of the coil frame, and a coil winding is wound within the winding window; coil retainers are provided at opposite ends of the coil frame along the axial direction of the coil winding, and the coil retainers are provided with grooves; and A magnetic shielding cover includes a first shielding cover body and a second shielding cover body. The first shielding cover body and the second shielding cover body are assembled to surround and install on the outer periphery of the coil winding. Both the first shielding cover body and the second shielding cover body are provided with a guiding structure. The guiding structure is snapped into the groove so that the first shielding cover body and the second shielding cover body are in clearance fit with the coil winding.

2. The reed relay according to claim 1, characterized in that, The guiding structure includes a support plate and a mounting part. The first shielding cover and the second shielding cover are both connected to the mounting part through the support plate. The support plate is used to support the mounting part to be snapped into the groove, so as to guide the installation of the first shielding cover and the second shielding cover.

3. The reed relay according to claim 2, characterized in that, The mounting part includes a mounting plate and a spring plate. The mounting plate is connected to the support plate, and the spring plate is disposed on the mounting plate and has a clearance fit with the support plate. The groove has a side slot for the mounting part to be inserted, and the end of the spring piece away from the mounting piece extends toward the side slot, and the spring piece engages with the side wall of the groove.

4. The reed relay according to claim 3, characterized in that, Two spring clips are provided, and they are respectively installed on opposite sides of the mounting plate. The two spring clips are engaged with the side walls of the groove.

5. The reed relay according to claim 4, characterized in that, The groove sidewall is provided with a beveled portion near the side opening, and the beveled portion causes the distance between the two sidewalls of the groove to decrease from the side opening to the middle of the groove. At least one of the two spring clips is tilted away from the other, and the spring clip is adapted to engage with the inclined surface.

6. The reed relay according to claim 5, characterized in that, The angle between the two spring pieces is adjustable.

7. The reed relay according to claim 2, characterized in that, The support plate is fitted with the bottom wall of the groove with a clearance.

8. The reed relay according to claim 2, characterized in that, The guiding structure also includes a positioning piece, which is connected to the end of the support piece away from the mounting portion; The coil retaining wall is recessed to form a positioning groove, and the positioning piece is installed in the positioning groove.

9. The reed relay according to claim 8, characterized in that, The bottom wall of the positioning groove protrudes to form a positioning post, and the positioning piece has a positioning hole, with the positioning post passing through the positioning hole.

10. The reed relay according to claim 9, characterized in that, The positioning post has a frustum structure, and the conical surface of the frustum structure engages with the wall of the positioning hole so that the positioning piece is in clearance fit with the bottom wall of the positioning groove.

11. The reed relay according to claim 1, characterized in that, The first shield and the second shield are mirror images of each other, and both include a shield body. At least a portion of the shield body is concealed inside the winding window, and the shield body is fitted with the coil retainer with a gap. The guiding structure is protruding and disposed on opposite sides of the shield body along the axial direction of the coil winding.

12. The reed relay according to claim 11, characterized in that, At least one of the two shielding cover bodies is provided with a hook, and at least the other of the two shielding cover bodies is provided with a latch, wherein the hook and the latch are connected in a snap-fit ​​manner.

13. The reed relay according to claim 12, characterized in that, The shielding cover body has a deformation barrier groove, which is located near the engagement part of the hook and the bayonet.

14. The reed relay according to claim 13, characterized in that, The hook, the latch, and the deformation blocking groove are all located near the side of the shield body along the axial direction of the coil winding; and / or, the deformation blocking groove is located near the latch, and the deformation blocking groove and the latch are arranged on the shield body along the axial direction of the coil winding.

15. The reed relay according to claim 11, characterized in that, The shielding cover body has a bent portion, and the bent portion has an exhaust window.

16. The reed relay according to claim 12, characterized in that, The hooks are distributed on the same side of the first shielding cover or the second shielding cover along the first direction of the magnetic shielding cover, and the slots are distributed on the opposite side of the first shielding cover or the second shielding cover along the first direction.

17. The reed relay according to claim 12, characterized in that, The reed relay also includes a reed switch and an injection-molded housing, wherein the reed switch, the coil frame on which the coil winding is wound, the magnetic shield and the injection-molded housing are integrally injection molded.

18. The reed relay according to claim 17, characterized in that, The reed switch includes a glass housing and a reed lead. A reed assembly is encapsulated inside the cavity of the glass housing. The reed assembly and the encapsulation of the glass housing are sealed by a sintering process to form a sintered section. One end of the reed lead is connected to the reed assembly, and the other end extends out of the glass housing from the sintered section, passes through the coil retainer, and extends to the outer surface of the coil frame.

Images