A relay

Abstract

This utility model discloses a relay, including a housing and an electromagnetic component disposed within the housing. The electromagnetic component has multiple low-voltage terminals and multiple high-voltage terminals. The first end of the housing has a first end face and a boss protruding from the first end face. Each high-voltage terminal passes through a corresponding first through hole on the first end face. The boss has a limiting groove corresponding to each low-voltage terminal, surrounding the external connection end of the low-voltage terminal and limiting the maximum lateral offset of the external connection end within a preset range. The boss serves as a physical isolation structure, forming an electrical isolation wall between the high-voltage and low-voltage terminals. The boss of this utility model significantly increases the creepage distance and electrical clearance between the high-voltage and low-voltage terminals; the limiting groove provides circumferential restraint on the external connection end of the low-voltage terminal, effectively limiting lateral displacement or shaking during installation and use, and significantly reducing the risk of low-voltage terminal breakage.

Description

Technical Field

[0001] This utility model relates to the field of relays, and in particular to a relay. Background Technology

[0002] Relays, as common electronic switching devices, are widely used in industrial control, home appliances, and automation equipment. Their basic structure typically includes a housing, electromagnetic components (such as the magnetic circuit and contact parts) housed within the housing, and a terminal system for connecting to external circuits. The terminal system generally includes low-voltage terminals for control signal input and high-voltage terminals for carrying the main circuit current.

[0003] In traditional relay design, low-voltage and high-voltage terminals are typically located on the same end face of the housing, arranged adjacent to each other. Because high-voltage terminals operate at high voltage and current, while low-voltage terminals are used to transmit control signals, insufficient electrical isolation between them can easily lead to the following problems:

[0004] Insufficient creepage distance: In high humidity, high pollution or high voltage environments, insufficient insulation distance between high-voltage terminals and low-voltage terminals may cause surface discharge or arcing, leading to short circuit or malfunction.

[0005] Severe electromagnetic interference: The transient electromagnetic field generated by the high-voltage terminals during the switching process may interfere with the control signal of the low-voltage terminals, affecting the response accuracy and stability of the relay;

[0006] High safety risks: In the event of insulation breakdown or arcing, it may cause equipment failure or even fire.

[0007] To address the aforementioned issues, some existing relays incorporate an insulating barrier between the high-voltage and low-voltage terminals, physically separating them to enhance electrical safety. However, these barriers are typically simple, straight-line structures. While they provide some degree of isolation between the high-voltage and low-voltage terminals, they also suffer from the following drawbacks: the barriers are usually thin-walled, resulting in poor impact resistance; and the barrier and terminal structures lack coordinated design. Utility Model Content

[0008] This utility model addresses the technical problems existing in the prior art by providing a relay that effectively improves electrical isolation performance and mechanical reliability through optimization of the housing structure.

[0009] The technical solution adopted by this utility model to solve its technical problem is as follows: a relay includes a housing and an electromagnetic component disposed within the housing. The electromagnetic component is provided with multiple low-voltage terminals and multiple high-voltage terminals. The first end of the housing is provided with a first end face and a boss protruding from the first end face. Each high-voltage terminal is respectively disposed in a first through hole corresponding to the first end face. The boss is provided with a limiting groove corresponding to each low-voltage terminal. The limiting groove surrounds the external connection end of the low-voltage terminal and limits the maximum lateral offset of the external connection end to a preset range. The boss serves as a physical isolation structure, forming an electrical isolation wall between the high-voltage terminals and the low-voltage terminals.

[0010] In a preferred embodiment, the external connection end of the low-voltage terminal does not extend outside the limiting groove; the limiting groove is configured to allow an external terminal to be inserted and electrically connected to the external connection end of the low-voltage terminal.

[0011] In a preferred embodiment, the bottom of the limiting groove is provided with a second through hole leading to the interior of the housing. The cross-sectional shape of the second through hole matches the cross-sectional shape of the external connection end of the low-voltage terminal. The external connection end of the low-voltage terminal passes through the second through hole, and the inner wall of the second through hole is in close fit or clearance fit with the outer wall of the external connection end of the low-voltage terminal. The cross-sectional dimension of the second through hole is smaller than the cross-sectional dimension of the limiting groove.

[0012] In a preferred embodiment, the external connection end of the low-voltage terminal is connected to the external terminal via a snap-fit ​​structure. The snap-fit ​​structure includes a matching hook and a snap hole, one of which is located at the external connection end of the low-voltage terminal, and the other of which is located at the external terminal.

[0013] In a preferred embodiment, the low-voltage terminal includes a rod-shaped main body and a sheet-shaped connecting end distributed sequentially along its length direction. The sheet-shaped connecting end constitutes the external connection end of the low-voltage terminal. The rod-shaped main body and the sheet-shaped connecting end are eccentrically arranged, and the central axis of the rod-shaped main body is offset to one side of the sheet-shaped connecting end in the width direction.

[0014] In a preferred embodiment, the second end of the housing is provided with a mounting flange for installation and fixing, and the mounting flange is provided with at least one mounting hole; the first end and the second end of the housing are opposite ends of the housing.

[0015] In a preferred embodiment, a reinforcing structure is provided between the mounting flange and the housing to enhance the structural strength of the mounting flange.

[0016] In a preferred embodiment, the mounting flange extends along the outer side of the housing, and the mounting flange has a connecting surface and a mounting surface that are sequentially distributed and arranged opposite to each other in the direction from a first end to a second end of the housing. The reinforcing structure includes a plurality of first reinforcing ribs that are disposed between the connecting surface and the outer side of the housing and are spaced apart.

[0017] In a preferred embodiment, there are two high-voltage terminals, and the first end face is provided with a baffle for isolating the two high-voltage terminals. The baffle extends along the gap between the two high-voltage terminals and is connected to the protrusion.

[0018] In a preferred embodiment, the first end face is provided with threaded terminals corresponding to each of the high-voltage terminals, and each high-voltage terminal protrudes from the first end face and is electrically connected to the corresponding threaded terminal; the threaded terminal is provided with a threaded hole for engaging with a bolt to connect a wire.

[0019] In a preferred embodiment, the threaded terminal includes a wiring portion having the threaded hole and a connecting portion disposed in the wiring portion. The wiring portion is accommodated in a receiving groove corresponding to the first end face, and the connecting portion protrudes from the first end face and is electrically connected to the high-voltage terminal by welding and / or riveting. The outer side of the wiring portion is provided with at least one second reinforcing rib extending laterally outward, and the inner side of the receiving groove is provided with a limiting groove corresponding to the second reinforcing rib, the second reinforcing rib engaging with the limiting groove.

[0020] In a preferred embodiment, a positioning structure is provided between the outer side of the wiring portion and the inner side of the receiving groove. The positioning structure includes a protrusion on the outer side of the wiring portion and a recess on the inner side of the receiving groove. The protrusion of the protrusion relative to its side is less than the protrusion of the second reinforcing rib, and the protrusion and the recess are fitted together.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. This utility model provides a first end face and a boss protruding from the first end face at the first end of the housing. Each high-voltage terminal passes through a corresponding first through hole on the first end face, and each low-voltage terminal is respectively positioned in a limiting groove corresponding to the boss. The boss forms an electrical isolation wall between the high-voltage and low-voltage terminals, significantly increasing the creepage distance and clearance between them. Simultaneously, the limiting groove surrounds the external connection end of the low-voltage terminal and limits the maximum lateral offset of the external connection end to a preset range. Therefore, it effectively restricts lateral displacement or shaking during installation and use, avoiding stress concentration caused by vibration, external force, or frequent insertion and removal operations, and significantly reducing the risk of low-voltage terminal breakage. Furthermore, compared to the thin-walled retaining wall in the prior art, the boss structure used in this utility model has a larger cross-sectional size and structural rigidity, possessing excellent vibration and impact resistance. It is less prone to deformation or cracking during long-term use, ensuring the long-term stability of isolation performance and further improving the overall safety and reliability of the relay.

[0023] 2. Preferably, the external connection end of the low-voltage terminal is entirely confined within the inner cavity of the limiting groove, without extending outside the limiting groove, and the limiting groove is configured to allow the insertion of an external terminal and electrical connection with the external connection end of the low-voltage terminal. This design not only effectively prevents the low-voltage terminal from being exposed to the external environment, effectively blocking dust, moisture, and electromagnetic interference, enhancing the anti-interference capability and environmental adaptability of low-voltage signal transmission, and significantly improving insulation protection performance, further reducing the risk of shaking and breakage caused by excessive lateral offset or vibration, but also allows the limiting groove to have both circumferential limiting and electrical connection functions, forming an integrated connection interface suitable for reliable insertion and installation of external terminals.

[0024] 3. Preferably, the external connection end of the low-voltage terminal is connected to the external terminal through a snap-fit ​​structure. This design eliminates the need for tools, enabling "plug-and-play" connection and significantly improving assembly and maintenance efficiency. The snap-fit ​​structure has a self-locking function, effectively preventing loosening due to vibration and ensuring connection stability. At the same time, since no additional fasteners (such as screws or retaining rings) are required, the overall structure is more compact, which is beneficial for the miniaturization and high-density integration of relays.

[0025] 4. Preferably, a mounting flange is provided at the second end of the housing to enable the relay to be installed and fixed. Furthermore, a reinforcing structure is provided between the mounting flange and the housing, which greatly enhances the structural strength of the mounting flange, thereby improving its impact resistance and significantly reducing the risk of breakage when the mounting flange is dropped. Further, the reinforcing structure includes multiple first reinforcing ribs, which are spaced apart between the connection surface of the mounting flange and the outer surface of the housing. This not only optimizes stress distribution but also further improves the stability of the overall structure, ensuring good connection reliability even under long-term use or harsh operating conditions.

[0026] 5. Preferably, the first end face is provided with threaded terminals corresponding to each high-voltage terminal, and each high-voltage terminal protrudes from the first end face and is electrically connected to the corresponding threaded terminal. This design allows the high-voltage terminals to be quickly connected to external loads using the threaded terminals. Combined with the quick connection between the low-voltage terminals and external terminals, and the design of the mounting flange, this invention enables the rapid assembly and disassembly of relays. In the event of faults such as terminal burning or contact adhesion, the relay can be quickly replaced, effectively avoiding prolonged equipment downtime and minimizing economic losses caused by production interruptions.

[0027] 6. Preferably, the wiring portion of the threaded terminal is housed in a corresponding receiving groove on the first end face, and a second reinforcing rib and a positioning groove are provided between the outer side of the wiring portion and the inner side of the receiving groove to form an interlocking structure, thereby achieving circumferential limiting and anti-rotation locking of the threaded terminal. This structure effectively prevents the threaded terminal from rotating, loosening, or being damaged due to excessive screw tightening torque during installation or use, significantly improving the mechanical stability and reliability of the connection.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the relay of the present invention is not limited to the embodiments. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0030] Figure 2 This is a top view of the present invention;

[0031] Figure 3 This is the front view of this utility model;

[0032] Figure 4 This is the right view of the present invention;

[0033] Figure 5 This is a three-dimensional structural diagram of the shell of this utility model;

[0034] Figure 6 This is a top view of the casing of this utility model;

[0035] Figure 7 This is a front view of the casing of this utility model;

[0036] Figure 8 This is a right view of the casing of this utility model;

[0037] Figure 9 This is a three-dimensional structural schematic diagram of the low-voltage terminal of this utility model;

[0038] Figure 10 This is a front view of the low-voltage terminal of this utility model;

[0039] Figure 11 This is a three-dimensional structural schematic diagram of the threaded terminal of this utility model;

[0040] Figure 12 This is a top view of the threaded terminal of this utility model;

[0041] Figure 13 This is a front view of the threaded terminal of this utility model;

[0042] Figure 14 This is a left view of the threaded terminal of this utility model;

[0043] In the figure, 1. Shell; 11. First end face; 111. First through hole; 112. Receiving groove; 113. Relief groove; 114. Positioning groove; 115. Recess; 12. Boss; 121. Limiting groove; 1211. Second through hole; 13. Mounting flange; 131. Mounting hole; 14. First reinforcing rib; 15. Retaining wall; 2. Low voltage terminal; 21. Sheet-shaped connecting end; 211. Snap hole; 22. Rod-shaped body; 221. Barb structure; 222. Winding groove; 3. High voltage terminal; 4. Threaded terminal; 41. Wiring part; 411. Threaded hole; 412. First reinforcing rib; 413. Protrusion; 414. Plate-shaped body; 415. Ring-shaped body; 42. Connecting part; 421. Riveting hole; 5. Rivet. Detailed Implementation

[0044] In this utility model, the terms "first," "second," etc., are used only to distinguish similar objects, not to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. The use of terms such as "upper," "lower," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, and is solely for the convenience of describing this utility model, not to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, it should not be construed as a limitation on the scope of protection of this utility model. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] Furthermore, in the description of this utility model, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0046] Please see Figures 1-14As shown, a relay of this utility model includes a housing 1 and an electromagnetic component (not shown) disposed inside the housing 1. The electromagnetic component has multiple low-voltage terminals 2 and multiple high-voltage terminals 3. The housing 1 is injection molded from insulating material, possessing good mechanical strength and electrical insulation properties, ensuring safety and stability in complex electromagnetic environments. The first end of the housing 1 has a first end face 11 and a boss 12 protruding from the first end face 11. The boss 12 is generally rectangular or square in structure and extends outward along the plane of the first end face 11. Specifically, an L-shaped step is formed between the boss 12 and the first end face 11, with the boss 12 corresponding to the vertical portion of the L-shaped step and the first end face 11 corresponding to the horizontal portion of the L-shaped step. The high-voltage terminals 3 are terminals used to transmit high-current, high-voltage signals, typically suitable for connecting main circuits or power circuits, and are led out from the contact portion of the electromagnetic component. The low-voltage terminals 2 are terminals used to transmit control signals, detection signals, or low-power signals, suitable for auxiliary circuits or signal circuits, and are led out from the coil of the electromagnetic component.

[0047] The first end face 11 has multiple first through holes 111 corresponding to multiple high-voltage terminals 3. Each first through hole 111 leads into the interior of the housing 1, and each high-voltage terminal 3 passes through the first through hole 111 and protrudes from the outside of the first end face 11. The boss 12 has multiple limiting grooves 121 corresponding to multiple low-voltage terminals. The limiting grooves 121 surround the external connection end of the low-voltage terminal 2 and limit the maximum lateral offset of the external connection end to a preset range, avoiding stress concentration caused by vibration, external force or frequent insertion and removal operations, and significantly reducing the risk of low-voltage terminal breakage. The boss 12 not only serves as a structural support, but more importantly, it acts as an electrical isolation wall between the high-voltage terminal 3 and the low-voltage terminal 2, effectively preventing electrical interference or short circuit risks between high-voltage and low-voltage circuits, and significantly improving the system's anti-interference capability and safety.

[0048] Furthermore, such as Figures 1-3 As shown, the external connection end of the low-voltage terminal 2 does not extend outside the limiting groove 121; that is, its entirety is located within the inner cavity of the limiting groove 121. This "recessed" design not only improves structural compactness but also effectively prevents foreign objects from entering or accidental contact with the terminal from causing a short circuit, further enhancing the protective effect of the limiting groove 121 on the external connection end of the low-voltage terminal 2. The limiting groove 121 is configured to allow external terminals to be inserted and electrically connected to the external connection end of the low-voltage terminal 2; therefore, the limiting groove 121 constitutes a slot structure. The low-voltage terminal 2, in conjunction with external matching terminals, can form a quick-connect terminal assembly.

[0049] In this embodiment, a fast and reliable electrical connection is achieved between the low-voltage terminal 2 and the external terminal through a snap-fit ​​structure. Specifically, the snap-fit ​​structure includes a hook (not shown in the figure) and a snap hole 211 that cooperate with each other. The snap hole 211 is located on the external connection end of the low-voltage terminal 2 and is through-hole along its thickness direction, forming a through-hole structure. The snap hole 211 is preferably rectangular, circular, or elliptical in cross-section. In this embodiment, a circular shape is used as an example. The inner wall of the snap hole 211 may be chamfered or have a guide bevel to facilitate the smooth entry of the hook and reduce insertion resistance. The hook is located at the corresponding position of the external terminal and its shape may be elastic arm type, flange type, or bent type. When the external terminal is inserted into the limiting groove 121 and contacts the low-voltage terminal 2, the hook automatically snaps into the snap hole 211, realizing mechanical locking and electrical conduction. This snap-fit ​​connection method requires no additional tools, is easy to install and disassemble, and is suitable for frequent maintenance or modular assembly scenarios. It is worth noting that the present invention does not limit the location of the hook and the hole. In other embodiments, the hole can be located on the external terminal, and the hook can be located on the external connection end 21 of the low-voltage terminal 2, which can achieve the same technical effect.

[0050] like Figure 9 , Figure 10 As shown, the low-voltage terminal 2 includes a rod-shaped body 22 and a sheet-shaped connecting end 21 arranged sequentially along its length, wherein the sheet-shaped connecting end 21 constitutes an external connection end. The width of the sheet-shaped connecting end 21 is greater than the width of the rod-shaped body 22, and the rod-shaped body 22 and the sheet-shaped connecting end 21 are eccentrically arranged, that is, the central axis of the rod-shaped body 22 is offset to one side of the sheet-shaped connecting end 21 in the width direction. Specifically, one end of the rod-shaped body 22 is integrally formed with the sheet-shaped connecting end 21, and a barb structure 221 is provided on the outer side of one end of the rod-shaped body 22. When the low-voltage terminal 2 is inserted into the coil frame of the electromagnetic assembly, the barb structure 221 can form a mechanical engagement with the inner wall of the coil frame, thereby achieving a firm fixation. The other end of the rod-shaped body 22 has a winding groove 222 on its side, the cross-section of which can be U-shaped, V-shaped, or semi-circular, used to guide and fix the winding path of the enameled wire. The low-voltage terminal 2 is generally wider at the top and narrower at the bottom, as shown in the figure. Figure 10As shown, this design, by reducing the overall material usage of the terminals, achieves lightweighting and material saving while meeting functional requirements, which greatly reduces the material cost of the low-voltage terminals 2. It also facilitates the parallel arrangement of multiple terminals in a limited space, and the rod-shaped body 22 makes it easier to insert and connect with the coil frame and wind the enameled wire. However, due to the large abrupt change in cross-section between the sheet-like connecting end 21 and the rod-shaped body 22, stress concentration points are easily formed at their connection. Under repeated insertion and removal or external force, fatigue fracture is likely to occur, especially when the sheet-like connecting end 21 is laterally offset or shaken, the risk of fracture increases significantly. To address this, the present invention provides a limiting groove 121 on the boss 12 of the housing 1 to form a four-sided enclosure structure for the sheet-like connecting end 21 of the low-voltage terminals 2, achieving omnidirectional constraint on the low-voltage terminals 2. When the low-voltage terminal 2 is plugged in or unplugged, the enclosure structure not only serves as a guide, guiding the plate-shaped connecting end 21 of the low-voltage terminal 2 to move along the predetermined axis and preventing deviation or tilting, but also significantly suppresses the swaying and displacement of the plate-shaped connecting end 21 in the lateral direction, thereby solving the problem of easy breakage of the low-voltage terminal 2 due to structural abrupt changes.

[0051] like Figure 6 As shown, the bottom of the limiting groove 121 is provided with a second through hole 1211 leading to the interior of the housing 1. The cross-sectional shape of the second through hole 1211 matches the cross-sectional shape of the external connection end (i.e., the sheet-like connection end 21) of the low-voltage terminal 2. The external connection end of the low-voltage terminal 2 is inserted into the second through hole 1211, and the inner wall of the second through hole 1211 is in close fit or with a small gap fit with the outer wall of the external connection end of the low-voltage terminal 2. This allows for precise positioning of the installation position of the low-voltage terminal 2 during assembly, effectively preventing its circumferential displacement. The cross-sectional dimension of the limiting groove 121 is larger than the cross-sectional dimension of the external connection end of the low-voltage terminal 2 and the cross-sectional dimension of the second through hole 1211, forming a suitable assembly gap. This structural design offers multiple advantages: Firstly, the second through hole 1211 provides precise guidance and positioning, ensuring the terminals are installed correctly. Secondly, the inner cavity of the limiting groove 121 facilitates the insertion or removal of the low-voltage terminals 2 using tweezers, clamps, or other auxiliary tools, significantly improving assembly and maintenance convenience. Simultaneously, the inner cavity of the limiting groove 121 also provides ample space for the insertion and connection of external terminals, avoiding interference and ensuring the reliability of electrical connections and smooth operation. The overall structure balances installation accuracy, operational convenience, and connection space requirements, achieving a high degree of unity between functionality and practicality.

[0052] Furthermore, the housing 1 is provided with a mounting flange 13 for installation and fixing. Specifically, the housing has a mounting flange 13 at its second end, which extends outward along the outer side wall of the housing 1 to form an annular or wing-shaped structure. It has at least one mounting hole 131 for fixing the entire relay to the equipment cabinet, control box, or mounting plate by screws, bolts, or clips. The mounting hole 131 is a notch, roughly U-shaped (i.e., a U-groove), but is not limited to this form; it can also be a rectangular hole, an elliptical hole, a long strip hole, or a circular hole, etc., and the specific selection can be matched with the installation method and the direction of force. In this utility model, the first end and the second end of the housing 1 are opposite ends along the housing 1. Specifically, the first end is the upper end of the housing 1, and the second end is the lower end of the housing 1. A reinforcing structure is provided between the mounting flange 13 and the housing 1 to effectively enhance the bending strength and load-bearing capacity of the mounting flange 13, preventing deformation or breakage due to installation stress or long-term use. The mounting flange 13 has connecting surfaces and mounting surfaces that are sequentially distributed from the first end to the second end of the housing 1 and are arranged opposite to each other, and are combined with Figure 1 As shown, the connecting surface of the mounting flange 13 is its top surface, used to mate with fasteners such as bolts, and the mounting surface is its bottom surface, used to tightly overlap with the surface of the equipment mounting part. The reinforcing structure specifically includes multiple first reinforcing ribs 14, which are evenly spaced between the connecting surface of the mounting flange 13 and the outer surface of the shell 1, effectively connecting the mounting flange 13 and the shell 1 to form a stable mechanical support structure.

[0053] Multiple mounting flanges 13 are provided, located on different sides of the housing 1, significantly improving the overall mechanical stability and installation reliability. In this embodiment, two mounting flanges 13 are used as an example, symmetrically arranged on opposite sides of the housing 1. This design is not only suitable for horizontal installation scenarios, but also effectively copes with vibrations, impacts, or lateral loads from different directions, avoiding housing deformation or installation loosening due to single-point force. Multiple first reinforcing ribs 14 are provided between the upper surface of each mounting flange 13 and the outer surface of the housing 1. These multiple first reinforcing ribs 14 are distributed at intervals along the length of the mounting flange 13, preferably equidistantly, and the specific layout can be optimized according to the stress analysis. The first reinforcing ribs 14 are usually rib structures with rectangular, trapezoidal, or triangular cross sections, one end of which is firmly connected to the outer wall of the housing 1, and the other end extends to the root area of ​​the mounting flange 13, forming a rigid support structure. Specifically, the mounting flange 13, the first reinforcing ribs 14, and the housing 1 are integrally molded structures, manufactured by an integral injection molding process.

[0054] In this embodiment, two high-voltage terminals 3 and two low-voltage terminals 2 are provided. A barrier 15 for isolating the two high-voltage terminals 3 is also provided on the first end face 11. The barrier 15 is a strip-shaped protrusion that extends along the gap between the two high-voltage terminals 3 and is integrally connected with the boss 12 to form a continuous insulating barrier. This structure effectively prevents arcing or short circuits between high-voltage circuits.

[0055] The first end face 11 is provided with threaded terminals 4 corresponding to each high-voltage terminal 3. Each high-voltage terminal 4 protrudes from the first end face 11 and is electrically connected to the corresponding threaded terminal 4. The threaded terminal 4 is provided with a threaded hole 411 for connecting external wires with a bolt. Therefore, the first end face 11 can also be called the wiring end face. Figures 11-14 As shown, the threaded terminal 4 includes a wiring portion 41 and a connecting portion 42. The wiring portion 41 has a threaded hole 411, and the connecting portion 42 is located on the wiring portion 41, protruding from the first end face 11 and electrically connected to the high-voltage terminal. Specifically, the connecting portion 42 is electrically connected to the high-voltage terminal 3 by welding and / or riveting. Specifically, the threaded terminal 4 has an L-shaped structure in space, with the wiring portion 41 and the connecting portion 42 corresponding to the two sides of the L-shaped structure, and the wiring portion 41 and the connecting portion 42 are integrally formed. The wiring portion 41 includes a plate-shaped body 414 and an annular body 415 located on the bottom surface of the plate-shaped body 414. The threaded hole 41 is located on the plate-shaped body 414 and / or the annular body 415, and is vertically continuous. The side of the connecting portion 42 facing away from the wiring portion 41 touches the side of the high-voltage terminal 3, and the connecting portion 42 has a riveting hole 421, which is riveted and fixed to the high-voltage terminal 3 by a rivet 5.

[0056] The first end face 11 is provided with receiving grooves 112 corresponding to each threaded terminal 4 for accommodating the wiring portion 41 of the threaded terminal 4. The inner side of the receiving groove 112 is provided with at least one positioning groove 114, while the outer side of the wiring portion 41 of the threaded terminal 4 is provided with a second reinforcing rib 412. The second reinforcing rib 412 extends laterally outward along the wiring portion 41 and engages with the positioning groove 114 to achieve mechanical limiting and anti-rotation functions. Specifically, the wiring portion 41 is provided with second reinforcing ribs 412 on both sides adjacent to the connecting portion 42. Two second reinforcing ribs 412 are provided on each side of the wiring portion 41 as an example, but this is not a limitation. The second reinforcing rib 412 is specifically provided in the plate-shaped body of the wiring portion 41. The bottom surface of the receiving groove 112 is provided with a relief groove 113 corresponding to the annular body 415 of the wiring portion 41. This relief groove 113 leads into the interior of the housing. Figure 5 , Figure 6 As shown.

[0057] Furthermore, the outer side of the wiring portion 41 is fitted with a positioning structure that engages with the inner side of the receiving groove 112. This structure achieves dual circumferential and axial positioning of the wiring portion 41 through the interlocking of the protrusions 413 and the recesses 115, effectively preventing rotation, displacement, or loosening during assembly or use. Specifically, the wiring portion 41 has multiple protrusions 413 in the outer region between the two second reinforcing ribs 412 on the same side. These protrusions 413 are rectangular and spaced apart along the arrangement direction of the two second reinforcing ribs 412, and the protrusion of the protrusion 413 relative to its side is less than the protrusion of the second reinforcing rib 412. The inner side of the receiving groove 112 has recesses 115 corresponding to each protrusion 413. When the wiring portion 41 is placed into the receiving groove 112, each of its second reinforcing ribs 412 engages with the corresponding positioning groove 114, and each of its protrusions 413 engages with the corresponding recess 115. The second reinforcing rib 412, with its large protrusion and overall rigidity, plays a major role in structural reinforcement and protection during the assembly and use of the threaded terminal 4. It effectively resists external stress, vibration, and installation force, preventing the threaded terminal from rotating, shifting, or loosening. The protrusion 413, as an auxiliary positioning structure, achieves precise positioning and guidance of the wiring part 41 through its fitting with the inner recess 115 of the receiving groove, suppressing minor displacement and improving installation accuracy and long-term stability. The second reinforcing rib 412 and the protrusion 413 work together to ensure the structural strength of the threaded terminal 4 and achieve highly reliable positioning, thus balancing functionality and structural safety.

[0058] This invention discloses a relay that constructs a three-dimensional isolation barrier with height and thickness through a boss 12. This significantly increases the creepage distance and electrical clearance between the high-voltage terminal 3 and the low-voltage terminal 1, effectively blocking the arc propagation path and improving electrical isolation performance, meeting the stringent requirements of high-voltage and high-safety-level applications. In particular, the boss 12 of this invention exhibits excellent anti-contamination capabilities and can pass the Japanese CTI (Comparative Tracking Index) test—applying a voltage of 175V or 250V between two non-connected metal electrodes and dripping salt water between the centers of the two electrodes, continuously observing whether continuity occurs. The structure of this invention demonstrates excellent insulation stability in this test, with no breakdown or leakage, fully verifying its long-term reliability in humid and polluted environments.

[0059] Meanwhile, the surrounding walls of the limiting groove 121 form a full-circumferential limiting structure for the external connection end (i.e., the sheet-like connection end 21) of the low-voltage terminal 2, effectively limiting its displacement and shaking in the lateral direction during installation and use. This design can significantly alleviate stress concentration problems caused by equipment vibration, external mechanical impact, or frequent plugging and unplugging operations, and prevent fatigue fracture of the low-voltage terminal 2 at the connection point (the transition area between the rod-shaped body 22 and the sheet-like connection end 21), greatly improving the mechanical reliability of the low-voltage terminal 2 connection and the overall service life of the product.

[0060] Furthermore, the boss 12 used in this invention has a larger cross-sectional size, higher structural rigidity, and stronger resistance to deformation compared to the thin-walled retaining walls commonly found in the prior art. Its robust three-dimensional structure is not prone to bending, cracking, or aging deformation during long-term operation. Even under harsh conditions such as high temperature, high humidity, and high vibration, it can still maintain stable isolation performance and structural integrity, effectively ensuring the long-term reliability of electrical safety.

[0061] The relay of this utility model is identical to or can be implemented using existing technology for the parts not described herein.

[0062] The above embodiments are only used to further illustrate a relay of the present utility model, but the present utility model is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the technical solution of the present utility model.

Claims

1. A relay comprising a housing and an electromagnetic assembly disposed within the housing, the electromagnetic assembly being provided with a plurality of low voltage terminals and a plurality of high voltage terminals; characterized by: The first end of the housing is provided with a first end face and a boss protruding from the first end face. Each high-voltage terminal is respectively provided with a first through hole corresponding to the first end face. The boss is provided with a limiting groove corresponding to each low-voltage terminal. The limiting groove surrounds the external connection end of the low-voltage terminal and limits the maximum lateral offset of the external connection end to a preset range. The boss serves as a physical isolation structure, forming an electrical isolation wall between the high-voltage terminal and the low-voltage terminal.

2. The relay according to claim 1, characterized in that: The external connection end of the low-voltage terminal does not extend outside the limiting groove; the limiting groove is configured to allow the insertion of an external terminal and to be electrically connected to the external connection end of the low-voltage terminal.

3. The relay of claim 2, wherein: The bottom of the limiting groove is provided with a second through hole leading to the interior of the housing. The cross-sectional shape of the second through hole matches the cross-sectional shape of the external connection end of the low-voltage terminal. The external connection end of the low-voltage terminal passes through the second through hole, and the inner wall of the second through hole is in close fit or clearance fit with the outer wall of the external connection end of the low-voltage terminal. The cross-sectional dimension of the second through hole is smaller than the cross-sectional dimension of the limiting groove.

4. The relay of claim 2, wherein: The external connection end of the low-voltage terminal is connected to the external terminal through a snap-fit ​​structure. The snap-fit ​​structure includes a matching hook and a snap hole. One of the hook and the snap hole is located at the external connection end of the low-voltage terminal, and the other of the hook and the snap hole is located at the external terminal.

5. The relay of claim 1, wherein: The low-voltage terminal includes a rod-shaped main body and a sheet-shaped connecting end distributed sequentially along its length. The sheet-shaped connecting end constitutes the external connection end of the low-voltage terminal. The rod-shaped main body and the sheet-shaped connecting end are arranged eccentrically, and the central axis of the rod-shaped main body is offset to one side of the sheet-shaped connecting end in the width direction.

6. The relay of claim 1, wherein: The second end of the housing is provided with a mounting flange for installation and fixing, and the mounting flange is provided with at least one mounting hole; the first end and the second end of the housing are opposite ends of the housing.

7. The relay according to claim 6, characterized in that: A reinforcing structure is provided between the mounting flange and the housing to enhance the structural strength of the mounting flange.

8. The relay of claim 7, wherein: The mounting flange extends along the outer side of the housing, and the mounting flange has a connecting surface and a mounting surface that are sequentially distributed and arranged opposite to each other in the direction from the first end to the second end of the housing. The reinforcing structure includes a plurality of first reinforcing ribs that are disposed between the connecting surface and the outer side of the housing and are spaced apart.

9. The relay of claim 1, wherein: The high-voltage terminals are provided in two parts. The first end face is provided with a barrier wall for isolating the two high-voltage terminals. The barrier wall extends along the gap between the two high-voltage terminals and is connected to the protrusion.

10. The relay according to any one of claims 1 to 9, characterized in that: The first end face is provided with threaded terminals corresponding to each of the high-power terminals. Each high-power terminal protrudes from the first end face and is electrically connected to the corresponding threaded terminal. The threaded terminal is provided with a threaded hole for engaging with a screw to connect a wire.

11. The relay of claim 10, wherein: The threaded terminal includes a wiring portion having the threaded hole and a connecting portion disposed in the wiring portion. The wiring portion is accommodated in a receiving groove corresponding to the first end face. The connecting portion protrudes from the first end face and is electrically connected to the high-voltage terminal by welding and / or riveting. The outer side of the wiring portion is provided with at least one second reinforcing rib extending laterally outward. The inner side of the receiving groove is provided with a positioning groove corresponding to the second reinforcing rib. The second reinforcing rib is fitted into the positioning groove.

12. The relay of claim 11, wherein: A positioning structure is provided between the outer side of the wiring part and the inner side of the receiving groove. The positioning structure includes a protrusion on the outer side of the wiring part and a concave part on the inner side of the receiving groove. The protrusion of the protrusion relative to its side is less than the protrusion of the second reinforcing rib, and the protrusion and the concave part are fitted together.

Images