Magnetic latching relay
By increasing the thickness of the permanent magnet and adding an adhesive layer between the permanent magnet and the mounting groove, the problem of permanent magnet breakage was solved, improving the service life and contact closing performance of the magnetic latching relay, while reducing production costs.
Patent Information
- Application Number
- CN202511429466.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-30
- Publication Date
- 2025-11-14
Smart Images
Figure CN120954929A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of relay technology, and in particular to a magnetic latching relay. Background Technology
[0002] The electromagnetic components of a magnetic latching relay include a yoke, an iron core, a permanent magnet, and a coil frame. The permanent magnet is installed inside the coil frame, with one end of the permanent magnet resting against the iron core and the other end resting against the yoke. When the moving and stationary contacts of the magnetic latching relay are closed, the relay generates a magnetic force that attracts the armature to strike the iron core, impacting the permanent magnet. This increases the risk of the permanent magnet breaking, causing a mismatch between the attractive force and the counterforce on the armature, which in turn prevents the magnetic latching relay from working properly and reduces its service life. Summary of the Invention
[0003] Therefore, it is necessary to provide a magnetic latching relay that reduces the risk of permanent magnet breakage and increases the service life of the magnetic latching relay when the armature strikes the iron core.
[0004] In a first aspect, embodiments of this application provide a magnetic latching relay, including:
[0005] The yoke has a mounting surface;
[0006] A coil frame is connected to the mounting plane. The coil frame is coaxially provided with a mounting groove and a mounting hole that are sequentially moved away from the mounting plane. The mounting groove and the mounting hole are in communication.
[0007] The iron core has one end located inside the mounting slot and the other end passing through the mounting hole and extending to the outside of the coil frame, and is correspondingly arranged with the armature;
[0008] A permanent magnet is disposed in the mounting groove and located between the iron core and the mounting plane;
[0009] The thickness of the permanent magnet is greater than the air gap between the iron core and the armature in the reset state of the magnetic latching relay.
[0010] In one embodiment, the cross-sectional area of the iron core in a plane perpendicular to the axis of the mounting groove is smaller than the cross-sectional area of the permanent magnet in a plane perpendicular to the axis of the mounting groove.
[0011] In one embodiment, the core includes a first connecting portion and a second connecting portion. The first connecting portion is located in the mounting groove, and the radial dimension of the first connecting portion is greater than the radial dimension of the second connecting portion. One end of the first connecting portion facing the second connecting portion abuts against the bottom wall of the mounting groove. One end of the second connecting portion is located in the mounting hole and connected to the first connecting portion. The other end of the second connecting portion extends out of the mounting hole and is correspondingly disposed with the armature.
[0012] In one embodiment, one end face of the permanent magnet is fitted with one end face of the first connecting portion near the mounting plane, and the other end face of the permanent magnet is fitted with the mounting plane; the cross-sectional area of the first connecting portion on the plane perpendicular to the axis of the mounting groove is smaller than the cross-sectional area of the permanent magnet on the axis perpendicular to the mounting groove.
[0013] In one embodiment, the thickness of the permanent magnet is three times or more the air gap between the iron core and the armature in the relay reset state.
[0014] In one embodiment, an adhesive layer is also included, and there are gaps between each pair of the inner wall of the mounting groove, the side wall of the iron core located in the mounting groove, the side wall of the permanent magnet, and the mounting plane; the adhesive layer is disposed in the gaps.
[0015] In one embodiment, adjacent gaps communicate to form a cavity, and the adhesive layer is formed by an adhesive filling the cavity.
[0016] In one embodiment, the sidewall of the mounting groove is provided with a first glue inlet communicating with the cavity.
[0017] In one embodiment, the first adhesive inlet extends in a direction parallel to the axial direction of the permanent magnet, and the length of the first adhesive inlet in the axial direction of the permanent magnet is greater than the thickness of the permanent magnet, so that the adhesive fills the gap between the circumferential sidewall of the permanent magnet and the inner wall of the mounting groove, as well as the gap between the sidewall of the permanent magnet facing the iron core, the sidewall of the iron core located in the mounting groove, and the sidewall of the mounting groove.
[0018] In one embodiment, the sidewall of the mounting groove is provided with an exhaust port communicating with the cavity.
[0019] In one embodiment, the adhesive layer includes a substrate and an adhesive covering the substrate.
[0020] In one embodiment, the system further includes a housing, the magnetic latching relay being located within the housing, and the housing having a second glue inlet that communicates with the first glue inlet.
[0021] In one embodiment, it also includes a reed, a spring, a moving contact, and a stationary contact;
[0022] The spring is located on the side of the armature facing away from the iron core, and the moving contact is located on the side of the spring facing the iron core;
[0023] The stationary contact and the moving contact are respectively set;
[0024] One end of the spring is connected to the armature, and the other end is connected to the yoke. The spring is used to provide a restoring reaction force for the armature.
[0025] In one embodiment, the coil frame is provided with a wire guide groove and a winding window. A coil made of enameled wire is wound in the winding window. The enameled wire has two connecting sections. The coil frame is provided with terminals corresponding to the connecting sections on the side near the mounting plane. One end of the connecting section is located in the winding window, and the other end extends outside the winding window and connects to the terminal through the wire guide groove. The portion of the connecting section near the circumferential sidewall of the coil frame is located in the wire guide groove.
[0026] The aforementioned magnetic latching relay has an air gap between the armature and the core. The thickness of the permanent magnet is greater than the air gap between the core and armature in the reset state. By increasing the thickness of the permanent magnet, its structural strength is improved. When the armature strikes the core, the permanent magnet can withstand a greater impact, enhancing its impact resistance, reducing the risk of breakage, and extending the service life of the magnetic latching relay. Simultaneously, the increased thickness of the permanent magnet helps to increase the attractive force of the magnetic latching relay in the reset state. Under the same operating voltage, a larger permanent magnet thickness makes it easier for the moving and stationary contacts to close, meeting higher contact voltage requirements. It also increases the output pressure after the moving and stationary contacts are closed, which helps to reduce the operating voltage of the magnetic latching relay, reduce the number of coil turns, and thus lower the production cost of the magnetic latching relay. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the structure of a magnetic latching relay in one embodiment.
[0028] Figure 2 This is an exploded view of the electromagnetic components of a magnetic latching relay in one embodiment.
[0029] Figure 3 This is a side view of a magnetic latching relay in one embodiment.
[0030] Figure 4 for Figure 3 A cross-sectional view of the cavity at point AA.
[0031] Figure 5 for Figure 3 Cross-sectional view of the adhesive layer at point AA.
[0032] Figure 6 This is a cross-sectional view of a magnetic latching relay in one embodiment.
[0033] Figure 7This is a schematic diagram of the assembly of the permanent magnet of a magnetic latching relay in one embodiment.
[0034] Figure 8 This is a schematic diagram of the assembly of the coil frame, core, and terminals of a magnetic latching relay in one embodiment.
[0035] Figure 9 This is a schematic diagram of a magnetic latching relay in a reset state in one embodiment.
[0036] Figure 10 This is a schematic diagram of the contacts of a magnetic latching relay just making contact in one embodiment.
[0037] Figure 11 This is a schematic diagram showing the armature of a magnetic latching relay in a closed state in one embodiment.
[0038] Figure 12 This is a schematic diagram of the attraction force curve of a magnetic latching relay in one embodiment.
[0039] Figure 13 This is a schematic diagram of the magnetic latching relay in another embodiment.
[0040] Figure 14 This is a schematic diagram of the assembly of the coil frame and the coil in one embodiment.
[0041] The attached figures are labeled as follows:
[0042] 1. Yoke; 11. First sidewall; 12. Second sidewall; 100. Mounting plane; 2. Coil frame; 21. Mounting groove; 22. Mounting hole; 211. First glue inlet; 212. Exhaust port; 24. Connecting post; 25. Coil; 251. Connecting section; 26. Wire passage groove; 27. Terminal; 28. Winding window; 3. Iron core; 31. First connecting part; 32. Second connecting part; 4. Permanent magnet; 5. Adhesive layer; 6. Cavity; 7. Armature; 71. Spring; 72. Moving contact; 8. Housing; 81. Second glue inlet; 9. Stationary contact; 10. Spring. Detailed Implementation
[0043] 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.
[0044] 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.
[0045] 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.
[0046] 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.
[0047] 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.
[0048] 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.
[0049] In one embodiment, such as Figure 1 and Figure 6 As shown, this application provides a magnetic latching relay, including a yoke 1, a coil frame 2, an iron core 3, a permanent magnet 4, and an armature 7. To facilitate positioning of the yoke 1 during assembly with the coil frame 2, the yoke 1 has a mounting plane 100. The coil frame 2 is connected to the mounting plane 100 and is used to mount the iron core 3 and the permanent magnet 4. To facilitate positioning of the iron core 3 and the permanent magnet 4 during installation, the coil frame 2 has an axially oriented mounting groove 21 and a mounting hole 22. The mounting groove 21 is located between the mounting plane 100 and the mounting hole, and the mounting groove 21 communicates with the mounting hole 22. A coil 25 is sleeved on the coil frame 2 for generating a magnetic field when connected to a power source. Specifically, as shown... Figure 1 and Figure 2 As shown, the yoke 1 is L-shaped, having a first sidewall 11 perpendicular to the axis of the mounting groove 21 and a second sidewall 12 parallel to the axis of the mounting groove 21. The mounting plane 100 is located on the first sidewall 11, and the second sidewall 12 is located on one side of the core 3.
[0050] In this application, as Figure 6 As shown, one end of the iron core 3 is located in the mounting groove 21, and the other end passes through the mounting hole 22 and extends to the outside of the coil frame 2, corresponding to the armature 7. The permanent magnet 4 is located in the mounting groove 21, between the iron core 3 and the mounting plane 100. Specifically, one end face of the permanent magnet 4 is in contact with the end face of the iron core 3 near the mounting plane 100, and the other end face of the permanent magnet 4 is in contact with the mounting plane 100.
[0051] The magnetic latching relay also includes a reed 71, a spring 10, a moving contact 72, and a stationary contact 9, such as Figure 9 As shown, the reed 71 is located on the side of the armature 7 facing away from the iron core 3, and a moving contact 72 is provided on the side of the reed 71 facing the iron core 3; a stationary contact 9 is correspondingly provided with the moving contact 72; one end of the spring 10 is connected to the armature 7, and the other end is connected to the yoke 1. Specifically, in this application, as... Figure 2 , Figure 3As shown, the first sidewall 11 of the yoke 1 extends outward in a partial manner to form a hook connected to the spring 10. The spring 10 has a tendency to move the armature 7 away from the core 3. The spring 10 is used to provide a restoring force for the armature 7, that is, the elastic force provided by the spring 10 is used to restore the magnetic latching relay to the reset state. It should be noted that in this application, the corresponding positions of the armature 7 and the core 3 are the same in the initial state or the reset state of the magnetic latching relay. In this application, the magnetic latching relay, when in the initial state or the reset state, as follows... Figure 9 As shown, armature 7 is separated from core 3, with an air gap a. Moving contact 72 and stationary contact 9 are in the open state; this is the reset state of the magnetic latching relay. When the magnetic latching relay is in the activated state, as... Figure 11 As shown, at this time, the armature 7 and the iron core 3 are closed, and the moving contact 72 and the stationary contact 9 are in an overtravel contact state.
[0052] like Figure 9 As shown, when the magnetic latching relay is in the initial state or the reset state, the armature 7 is separated from the iron core 3. At this time, the iron core 3 and the side walls opposite the armature 7 are at a certain angle. In order to quickly obtain the specific value of the air gap a, in this application, the distance from the center of the end face of the iron core 3 near the armature 7 to the armature 7 when the magnetic latching relay is in the reset state is defined as the air gap a.
[0053] It should be noted that in this application, when the magnetic latching relay operates, the relay transitions from the reset state to the operating state, that is, the moving contact 72 and the stationary contact 9 transition from the open state to the closed state. A positive pulse voltage is applied to the coil 25. At this time, the magnetic force generated by the coil 25 and the magnetic force generated by the permanent magnet 4 are superimposed, and the attractive force on the armature 7 is greater than the reaction force of the spring 10. Under the action of the attractive force, the armature 7 moves closer to the iron core 3, such as... Figure 10 As shown, the armature 7 drives the moving contact 72 on the spring 71 to make contact with the stationary contact 9. At this time, the contact area between the moving contact 72 and the stationary contact 9 is too small, and poor contact between the moving and stationary contacts is likely to occur. This leads to excessive contact resistance at the contact point, causing the temperature at the contact point to rise. Therefore, it is necessary to continue moving the armature 7 closer to the iron core 3 to maintain a larger contact pressure, increase the contact area between the moving and stationary contacts, and avoid poor contact at the contact point that could cause the temperature to rise. Figure 11As shown, when the contacts of the magnetic latching relay are in the closed state, the contact area between the moving and stationary contacts is relatively large. At this time, the coil is de-energized (no pulse voltage passes through the coil), and no magnetic field is generated within the coil. The magnetic force generated by the permanent magnet 4 is greater than the restoring force of the spring 10, and the moving and stationary contacts remain closed. If, during the relay operation, the permanent magnet 4 breaks due to the impact force of the armature 7 striking the iron core 3, the magnetic force generated by the permanent magnet 4 weakens, the contact between the moving and stationary contacts becomes unreliable, and the temperature of each contact easily rises, thus affecting the contact life and even causing the moving and stationary contacts to stick together. Furthermore, if the magnetic force generated after the permanent magnet 4 breaks is less than the restoring force of the spring 10, the moving contact 72 and the stationary contact 9 may separate directly, affecting the normal operation of the magnetic latching relay.
[0054] When the magnetic latching relay switches from the closed state to the reset state, a reverse pulse voltage is applied to coil 25. At this time, the magnetic force generated by coil 25 is in the same direction as the reset reaction force of spring 10. The superposition of the magnetic force generated by coil 25 and the reset reaction force of spring 10 is much greater than the magnetic force of permanent magnet 4. Under the action of the reset reaction force and the magnetic force of coil 25, armature 7 moves away from iron core 3 until it reaches the reset state, that is, returns to the initial state. Figures 11 to 9 The diagram illustrates the switching process from the closed state to the reset state of a magnetic latching relay. Figures 9 to 11 As shown, this illustrates the switching of a magnetic latching relay from its initial or reset state to its closed or activated state.
[0055] In some traditional technologies, the permanent magnet 4 is relatively thin. During the process of the armature 7 striking the iron core 3, the impact force is directly transmitted to the permanent magnet 4 through the contact surface between the iron core 3 and the permanent magnet 4. Furthermore, the other end of the permanent magnet 4 rests against the mounting plane 100. The permanent magnet 4 is prone to breakage under large impact forces, which disrupts the original attraction and reaction force balance of the magnetic latching relay. This can lead to insufficient contact pressure, resulting in poor contact, overheating, or even the inability of the magnetic latching relay contacts to close. Therefore, in this application, if... Figure 9 As shown, when the magnetic latching relay is in the released state, the thickness of the permanent magnet 4 is greater than the air gap a between the iron core 3 and the armature 7 in the reset state of the magnetic latching relay. By increasing the thickness of the permanent magnet 4, the structural strength of the permanent magnet 4 is improved. When the armature 7 strikes the iron core 3, the permanent magnet 4 can withstand a larger impact, which improves the impact resistance of the permanent magnet 4, reduces the risk of the permanent magnet 4 breaking, and increases the service life of the magnetic latching relay.
[0056] Furthermore, in some traditional technologies, to prevent the relative positions of the yoke 1, iron core 3, permanent magnet 4, and coil frame 2 from shifting when the armature 7 strikes the iron core 3, thus causing instability in the magnetic field force generated by the permanent magnet 4 and making the contacts prone to poor contact during closure, the permanent magnet 4 is interference-fitted with the mounting groove 21. The permanent magnet 4, subjected to the impact force of the armature 7 striking the iron core 3 and the compression of the mounting groove 21, is more prone to breakage, affecting the normal operation of the magnetic latching relay. Therefore, as... Figures 4 to 6 As shown, in one embodiment, there are gaps between the inner wall of the mounting groove 21, the side wall of the iron core 3 located within the mounting groove 21, the side wall of the permanent magnet 4, and the mounting plane 100. That is, the permanent magnet 4 and the mounting groove 21 are in a clearance fit. To reduce the risk of relative displacement between the yoke 1, iron core 3, permanent magnet 4, and coil frame 2, an adhesive layer 5 is provided within the gaps. This improves the reliability and stability of the connection between the yoke 1, iron core 3, permanent magnet 4, and coil frame 2, ensuring the relay operates normally. Simultaneously, when the armature 7 strikes the iron core 3, the adhesive layer 5 can buffer the impact transmitted through the iron core 3 to the permanent magnet 4, reducing the risk of the permanent magnet 4 breaking and improving the relay's service life.
[0057] like Figure 6 As shown, to facilitate the placement of adhesive layer 5 in the gaps between the inner wall of the mounting groove 21, the side wall of the iron core 3 located within the mounting groove 21, the side wall of the permanent magnet 4, and the mounting plane 100, in one embodiment, the gaps between the inner wall of the mounting groove 21, the side wall of the iron core 3 located within the mounting groove 21, the side wall of the permanent magnet 4, and the mounting plane 100 are interconnected to form a cavity 6. The cavity 6 is filled with adhesive to form adhesive layer 5. That is, adjacent gaps are interconnected to form a cavity. By filling the cavity 6 with adhesive, the adhesive flows within the cavity 6 under the influence of gravity, ensuring that the gaps between the permanent magnet 4, the coil frame 2, the iron core 3, and the yoke 1 are all filled with adhesive. After the adhesive cures, adhesive layer 5 is formed. In some other embodiments, the adhesive layer 5 can be configured such that one or more parts are installed in the gaps, depending on the shape of the gaps between the permanent magnet 4, the coil frame 2, the iron core 3 or the yoke 1, and the assembly sequence. The design of the adhesive layer 5 can be adapted to meet actual needs.
[0058] like Figure 2 As shown, in one embodiment, to improve the forming efficiency of the adhesive layer 5 and reduce assembly difficulty, the adhesive layer 5 is formed using an adhesive filled within the cavity 6. Further, to facilitate the introduction of the adhesive into the cavity 6, the sidewall of the mounting groove 21 is provided with a first adhesive inlet 211 communicating with the cavity 6. Figure 3 , Figure 4As shown, one end of the first adhesive inlet 211 is connected to the cavity 6, and the other end is connected to the external environment. When the adhesive is introduced into the cavity 6, the outlet of the external adhesive supply device is connected to the first adhesive inlet 211, so that the adhesive enters the cavity 6 through the first adhesive inlet 211. The adhesive flows under the action of gravity and flows into the gap between the permanent magnet 4, the coil frame 2, the iron core 3, and the yoke 1. After the adhesive in the cavity 6 cures, a stable adhesive layer 5 is formed. The presence of the adhesive layer makes the connection between the yoke 1, the coil frame 2, the iron core 3, and the permanent magnet 4 tighter, improving the reliability and stability of the connection between the yoke 1, the iron core 3, the permanent magnet 4, and the coil frame 2, and reducing the risk of relative displacement between the yoke 1, the iron core 3, the permanent magnet 4, and the coil frame 2. At the same time, due to the presence of the adhesive layer 5, when the impact force on the iron core 3 is transmitted to the permanent magnet 4, it forms a buffer, reducing the risk of the permanent magnet 4 breaking and improving the service life of the relay.
[0059] Furthermore, such as Figure 3 and Figure 6 As shown, in order to enable the adhesive to quickly fill the gaps and improve the uniformity and efficiency of the adhesive layer 5 molding, in one embodiment, the extension direction of the first adhesive inlet 211 is parallel to the axial direction of the permanent magnet 4. To facilitate uniform adhesion of the adhesive to the axial sidewalls and axial ends of the permanent magnet, thereby improving the connection strength between the permanent magnet 4 and the coil frame 2 and the iron core 3, in this application, as... Figure 4 As shown, the length of the first adhesive inlet 211 in the axial direction of the permanent magnet 4 is greater than the thickness of the permanent magnet 4. It should be noted that the thickness direction of the permanent magnet 4 is the axial direction of the permanent magnet 4. When the length of the first adhesive inlet 211 in the axial direction of the permanent magnet 4 is greater than the thickness of the permanent magnet 4, when the adhesive enters the first adhesive inlet 211, the adhesive can fill the gap between the circumferential sidewall of the permanent magnet 4 and the inner wall of the mounting groove 21, as well as the gap between the sidewall of the permanent magnet 4 facing the iron core 3, the sidewall of the iron core 3 located in the mounting groove 21 and the inner wall of the mounting groove 21. This allows the adhesive to adhere to all surfaces of the permanent magnet 4 and connect with the coil frame 2 and the iron core 3, which is beneficial for forming a uniform adhesive layer and improving the reliability of the connection between the permanent magnet 4, the coil frame 2, and the iron core 3.
[0060] To facilitate the opening of the first inlet 211, in this embodiment, the opening of the first inlet 211 is rectangular. To prevent adhesive residue from remaining on the sidewall of the first inlet 211 and to facilitate the introduction of adhesive into the cavity through the first inlet 211, the sidewall of the first inlet 211 is provided with a slope to guide the adhesive flow and improve the filling efficiency. In some other embodiments, the shape of the first inlet 211 can be adaptively adjusted according to actual needs.
[0061] Furthermore, such as Figure 4As shown, since the permanent magnet 4 is cylindrical, in order to further improve the filling efficiency of the adhesive in the cavity 6, as... Figure 2 and Figure 3 As shown, the projection of the first glue inlet 211 onto a plane perpendicular to the second sidewall 12 and perpendicular to the mounting plane 100 is positioned close to the axis of the permanent magnet 4. Thus, see [reference needed]. Figure 4 When the adhesive enters the cavity 6 through the first inlet 211, it can flow into the cavity 6 simultaneously from both clockwise and counterclockwise directions. Compared to the adhesive entering the cavity 6 from a single direction, the efficiency is doubled.
[0062] Furthermore, such as Figure 4 As shown, during the filling process of cavity 6, the adhesive enters cavity 6 under the influence of gravity, forming an air-trapping area on the side of cavity 6 away from the first adhesive inlet 211. This makes it difficult for the adhesive to flow in, resulting in some gaps between the yoke 1, coil frame 2, iron core 3, and permanent magnet 4 not being filled with adhesive. This leads to uneven adhesive layer 5, reducing bonding strength. Simultaneously, air bubbles may form within the adhesive, making the cured adhesive layer 5 prone to defects, such as cracks or voids. In this case, the relative positions of the yoke 1, coil frame 2, iron core 3, and permanent magnet 4 are easily shifted due to the impact force of the armature 7 on the resistor assembly. Therefore, as... Figure 7 and Figure 8 As shown, in one embodiment, the sidewall of the mounting groove 21 is provided with an exhaust port 212 communicating with the cavity 6. When adhesive is injected into the cavity 6, as the volume of adhesive continues to increase, the internal pressure of the cavity 6 increases accordingly, causing residual air to be squeezed to the exhaust port 212, and the air in the cavity 6 is discharged from the exhaust port 212. This avoids the formation of air bubbles in the adhesive and improves the stability of the adhesive layer 5 structure.
[0063] Furthermore, the vent 212 should be positioned away from the area where the first glue inlet 211 is located to prevent adhesive from directly entering the vent 212 through the first glue inlet 211 during filling, thus preventing blockage of the vent 212 and obstruction of the venting path, and also preventing adhesive from overflowing from the vent 212. Specifically, in some embodiments, the vent 212 can be a hole or a groove, and the vent 212 only needs to communicate with the cavity 6 and the external environment. The specific structure of the vent 212 can be designed according to actual usage requirements. In one embodiment of this application, the vent 212 is a groove and is positioned opposite to the first glue inlet 211.
[0064] Furthermore, such as Figure 4 , Figure 5 and Figure 6As shown, in one embodiment, to facilitate control of the amount of adhesive filling the cavity 6, and to avoid insufficient adhesive filling leading to unfilled gaps between the yoke 1, coil frame 2, iron core 3, and permanent magnet 4, thereby affecting the connection strength between the yoke 1, coil frame 2, iron core 3, and permanent magnet 4, the volume of the cavity 6 is [missing information]. The volume of adhesive filling cavity 6 is , This ensures that the adhesive can flow into the relevant gaps to form a continuous adhesive layer, thereby improving the bonding strength between the yoke 1, coil frame 2, iron core 3, and permanent magnet 4, as well as the overall stability of the magnetic latching relay structure.
[0065] In some other embodiments, since the cavity 6 is filled with adhesive, it is necessary to wait for the adhesive to cure. To improve the overall assembly efficiency of the magnetic latching relay, the adhesive layer 5 can be composed of a substrate and adhesive. That is, a substrate with a thickness slightly smaller than the gap is provided, and the outer wall of the substrate is covered with adhesive. When assembling the yoke 1, coil frame 2, iron core 3, and permanent magnet 4, the adhesive layer 5 is first pasted onto the side wall of the corresponding part. After assembly, the gaps between the parts can be filled. Furthermore, the adhesive layer 5 can be set as one or more units, each corresponding to the gap between different parts. The number of adhesive layers 5 can be adaptively adjusted according to the shape of the gap between the yoke 1, coil frame 2, iron core 3, and permanent magnet 4.
[0066] It should be noted that the substrate can be made of flexible materials, such as rubber or silicone. Therefore, when the permanent magnet 4 receives the impact force transmitted by the iron core 3, it can form a buffer, which is similar to the buffering effect of the adhesive layer 5 formed by direct curing of the adhesive. The structure of the adhesive layer 5 can be adjusted according to actual production needs.
[0067] In traditional techniques, the yoke 1 and the coil frame 2 are fixed together by hot riveting. The coil frame 2 is made of plastic, specifically, as shown in... Figure 1As shown, the coil frame 2 has multiple connecting posts 24 on one end face facing the mounting plane 100. The yoke 1 has connecting holes corresponding to the connecting posts 24 on the side wall of the mounting plane 100. When the yoke 1 is connected to the coil frame 2, the connecting posts 24 are inserted into the connecting holes. Then, the end of the connecting post 24 outside the connecting hole is fixed by hot riveting, that is, the end of the connecting post 24 outside the connecting hole melts and fills the connecting hole. After cooling, the yoke 1 and the coil frame 2 are fixedly connected. Since the impact force of the armature 7 on the iron core 3 is transmitted to the yoke 1 through the permanent magnet 4, the connecting posts 24 on the coil frame 2 bear a large impact force, which makes it easy for the relative positions of the yoke 1, coil frame 2, iron core 3 and permanent magnet 4 to move. In this application, not only is the connection method of welding and fixing the coil frame 2 and the connecting post 24 retained, but the connection strength between the yoke 1 and the coil frame 2 is improved by the adhesive layer 5, which reduces the risk of the relative position of the yoke 1, the coil frame 2, the iron core 3 and the permanent magnet 4 shifting.
[0068] like Figure 9 As shown, further, in some embodiments, since the coil frame 2 is provided with a winding window 28, a coil 25 is formed by winding enameled wire inside the winding window 28. The coil 25 has two connecting segments 251, specifically, the two connecting segments 251 are the starting segment and the ending segment of the enameled wire, respectively. The two connecting segments 251 are respectively connected to the terminals 27 on the coil frame 2 one-to-one, specifically, as shown... Figure 1 and Figure 14As shown, terminal 27 is located on the side of coil frame 2 near mounting plane 100. One end of connecting section 251 is located inside coil window 28, and the other end extends outside winding window 28 to connect with terminal 27. In this application, due to the increased thickness of permanent magnet 4, the axial dimension of mounting groove 21 inside coil frame 2 increases, resulting in an increased distance between connecting section 251 and winding window 28 and terminal 27. That is, the enameled wire between connecting section 251 and winding window 28 and terminal 27 is exposed on coil frame 2. Therefore, during subsequent assembly of the magnetic latching relay, the enameled wire is prone to breakage or stretching due to scratches. Therefore, in this application, a wire-passing groove 26 is provided on the side wall of the coil frame 2. One end of the connecting section 251 is located at the winding window 28, and the other end extends outside the winding window 28, passing through the wire-passing groove 26 and connecting to the terminal 27. Furthermore, the portion of the connecting section 251 near the circumferential side wall of the coil frame 2 is located within the wire-passing groove 26. This prevents the enameled wire from being exposed on the coil frame 2, thus avoiding scratching. In addition, the wire-passing groove 26 serves as a conductor and relatively fixed position for the enameled wire corresponding to the winding window and terminal 27, reducing the risk of wire breakage or stretching of the enameled wire during the assembly process of the magnetic latching relay, reducing product rework rate, improving assembly quality reliability, and reducing costs. Moreover, because the wire-passing groove 26 fixes the relative position of the enameled wire, it reduces the risk of wire breakage due to vibration, impact, drops, or other abnormal conditions during actual application, improving the stability of the product during use.
[0069] Furthermore, the wire guide groove 26 is designed according to the routing path of the connecting section 251 and the terminal 27, so that the enameled wire exposed on the coil frame 2 by the connecting section 251 is completely inserted into the wire guide groove 26, thus fixing the position of the enameled wire. In this application, the extension path of the wire guide groove 26 is alternately arranged perpendicular to the axis of the mounting groove 21 and / or parallel to the axis of the mounting groove 21 to meet the requirements for fixing the enameled wire. Furthermore, in order to prevent the enameled wire from sliding out of the mounting groove 21, a cover plate (not shown in the figure) is also provided at the open end of the wire guide groove 26. The cover plate is engaged with the wire guide groove 26 to wrap the enameled wire inside the wire guide groove 26, preventing the enameled wire from being exposed on the coil frame 2 and improving the reliability of the enameled wire fixing.
[0070] In conventional magnetic latching relays, the air gap between the armature 7 and the core 3 is increased to meet the application requirements of larger contact voltages (such as contact terminal voltages greater than 12VDC) under the same current. A larger air gap can break higher contact voltages under the same current. However, increasing the air gap brings another problem: as the armature 7 moves closer to the core 3, the acceleration of the armature 7 is greater. Therefore, the impact force transmitted to the permanent magnet 4 when the armature 7 strikes the core 3 is also greater. In this application, by thickening the permanent magnet 4, the impact resistance of the permanent magnet 4 can be effectively improved, and the permanent magnet 4 is less likely to break due to the impact of the armature 7. Meanwhile, the increased thickness of the permanent magnet 4 helps to improve the attraction force of the magnetic latching relay in the reset state. Under the same operating voltage (positive pulse voltage), the greater the thickness of the permanent magnet 4, the easier it is for the moving and stationary contacts to close, which can meet the greater contact voltage requirements. It can also increase the output pressure after the moving and stationary contacts are closed, which is beneficial to reduce the operating voltage of the magnetic latching relay. At the same time, it reduces the number of turns of the coil 25, thereby reducing the production cost of the magnetic latching relay.
[0071] Furthermore, in order to meet the greater contact voltage requirements and to ensure that the permanent magnet 4 has good impact resistance, the thickness of the permanent magnet 4 in some embodiments is three times or more the air gap a between the iron core 3 and the armature 7 in the relay's reset state. This allows the magnetic latching relay to meet the greater contact voltage requirements while maintaining good impact resistance, even when the air gap is large.
[0072] Furthermore, as the thickness of the permanent magnet 4 increases, the magnetic field generated by the permanent magnet 4 becomes stronger. The magnetic latching relay needs to apply a greater reverse force to overcome the magnetic force generated by the permanent magnet 4 to return to its original position, resulting in reduced sensitivity during return. Therefore, in one embodiment of the application, the cross-sectional area of the iron core 3 in the plane perpendicular to the axis of the mounting groove 21 is smaller than the cross-sectional area of the permanent magnet 4 in the plane perpendicular to the axis of the mounting groove 21. Specifically, in this application, the permanent magnet 4 is a cylinder or a prism. By increasing the cross-sectional area of the permanent magnet 4, the magnetic flux distribution of the permanent magnet 4 becomes more dispersed, leading to a decrease in magnetic flux density per unit area. Therefore, the holding force of the armature 7 is reduced when the contacts are closed, and the magnetic force of the permanent magnet 4 that needs to be overcome during return is also weakened. This makes the movement of the armature 7 more flexible and improves the sensitivity of the magnetic latching relay.
[0073] Furthermore, to facilitate the limiting of the iron core 3 during installation and ensure good product consistency during mass production of the magnetic latching relay, in one embodiment, the iron core includes a first connecting portion 31 and a second connecting portion 32 coaxially arranged. The first connecting portion 31 is located within the mounting groove 21, and its radial dimension is larger than that of the second connecting portion 32. One end of the first connecting portion 31 facing the second connecting portion 32 abuts against the bottom wall of the mounting groove 21, thereby limiting the axial movement of the iron core 3. One end of the second connecting portion 32 is located within the mounting hole 22 and connected to the first connecting portion 31, while the other end extends outside the mounting hole 22 and corresponds to the armature 7. In other words, the iron core 3 is T-shaped overall, and when the iron core 3 is installed within the mounting groove 21, the first connecting portion 31 is located within the mounting groove 21 to achieve axial limiting. Simultaneously, since one end face of the permanent magnet 4 is in contact with the end face of the first connecting part 31 near the mounting plane 100, and the other end face of the permanent magnet 4 is in contact with the mounting plane 100, the axial position of the iron core 3 is fixed. This is beneficial for maintaining a consistent air gap a between the iron core 3 and the armature 7 during the mass production of magnetic latching relays, thereby improving the stability and reliability of mass production of magnetic latching relays.
[0074] Furthermore, the cross-sectional area of the first connecting part 31 on the plane perpendicular to the axis of the mounting groove 21 is smaller than the cross-sectional area of the permanent magnet 4 on the axial direction perpendicular to the mounting groove 21. That is, in the direction from the iron core 3 to the armature 7, the magnetic force generated by the permanent magnet 4 decreases, making the magnetic flux distribution in the air gap region between the iron core 3 and the armature 7 more uniform, which helps to balance the magnetic force generated by the permanent magnet 4 with the reaction force generated by the spring 10.
[0075] To verify the performance of the permanent magnet 4 in this application, while keeping all other conditions the same, only the thickness and cross-sectional area of the permanent magnet 4 were changed. A comparative analysis of the embodiments and comparative examples in this application is as follows: Figure 12 As shown, in the comparative example, the cross-section and thickness of the permanent magnet are smaller than those in the embodiment of this application. Figure 12 In the diagram, the solid line represents the attraction curve corresponding to one embodiment of this application (where the thickness of the permanent magnet is three times the air gap between the core 3 and the armature 7 in the relay's reset state), the dashed line represents the attraction curve corresponding to the comparative embodiment (where the thickness of the permanent magnet is equal to the air gap between the core 3 and the armature 7 in the relay's reset state), and the broken line represents the reaction force curve of the spring 10. The horizontal axis represents the air gap, and the vertical axis represents the attraction force generated by the permanent magnet 4 when the contacts are closed. When the contacts of the magnetic latching relay need to be closed, such as... Figure 12As shown, under the same conditions, in the relay reset state, the magnetic field attraction between the iron core 3 and the armature 7 is greater than that in the comparative example. That is, the magnetic force generated when the permanent magnet 4 in this application is closed is larger than that in the comparative example, making it easier for the moving and stationary contacts to close, and providing sufficient contact pressure after the moving and stationary contacts are closed. When the magnetic latching relay needs to reset, a reverse pulse voltage needs to be applied to the coil 25 to provide a coil magnetic field force opposite to the magnetic field force of the permanent magnet 4. The magnetic field force of the coil and the reaction force of the spring 10 overcome the magnetic attraction of the permanent magnet 4, and the armature moves away from the iron core. Figure 12 As shown, the cross-sectional area of the permanent magnet 4 in this application is larger than that of the permanent magnet in the comparative example. That is, the magnetic flux density of the permanent magnet 4 per unit area is smaller, resulting in a smaller magnetic attraction force between the armature 7 and the iron core 3 when the moving and stationary contacts are closed. Therefore, this application needs to overcome the smaller magnetic force between the iron core 3 and the armature 7. Under the same coil magnetic field force, the moving and stationary contacts of the magnetic latching relay in this application can achieve rapid disconnection. This application has good sensitivity and is easy to open and close when applied to a magnetic latching relay with a large air gap.
[0076] like Figure 13 As shown, further, in some embodiments, to facilitate the isolation of the armature 7 and the magnetic latching relay from the external environment and avoid affecting their normal operation, the magnetic latching relay also includes a housing 8, wherein the magnetic latching relay and the armature 7 are both located inside the housing 8. To facilitate the potting of adhesive into the cavity 6 to form an adhesive layer 5, the side wall of the housing 8 is provided with a second adhesive inlet 81, which communicates with the first adhesive inlet 211. That is, after the magnetic latching relay is installed in the housing 8, the adhesive enters the cavity 6 through the second adhesive inlet 81 and the first adhesive inlet 211 to fill the gaps between the yoke 1, the coil frame 2, the iron core 3, and the permanent magnet 4.
[0077] 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.
[0078] 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 magnetic latching relay, characterized in that, include: armature; The yoke has a mounting surface; A coil frame is connected to the mounting plane. The coil frame has an axially arranged mounting groove and a mounting hole, and the mounting groove communicates with the mounting hole. The iron core has one end located inside the mounting slot and the other end passing through the mounting hole and extending to the outside of the coil frame, and is correspondingly arranged with the armature; A permanent magnet is disposed in the mounting groove and located between the iron core and the mounting plane; The thickness of the permanent magnet is greater than the air gap between the iron core and the armature in the reset state of the magnetic latching relay.
2. The magnetic latching relay according to claim 1, characterized in that, The cross-sectional area of the iron core in a plane perpendicular to the axis of the mounting groove is smaller than the cross-sectional area of the permanent magnet in a plane perpendicular to the axis of the mounting groove.
3. The magnetic latching relay according to claim 2, characterized in that, The iron core includes a first connecting part and a second connecting part. The first connecting part is located in the mounting groove, and the radial dimension of the first connecting part is greater than the radial dimension of the second connecting part. One end of the first connecting part facing the second connecting part abuts against the bottom wall of the mounting groove. One end of the second connecting part is located in the mounting hole and connected to the first connecting part. The other end of the second connecting part extends out of the mounting hole and is correspondingly arranged with the armature.
4. The magnetic latching relay according to claim 3, characterized in that, One end face of the permanent magnet is in contact with the end face of the first connecting part near the mounting plane, and the other end face of the permanent magnet is in contact with the mounting plane; the cross-sectional area of the first connecting part on the plane perpendicular to the axis of the mounting groove is smaller than the cross-sectional area of the permanent magnet on the axis perpendicular to the mounting groove.
5. The magnetic latching relay according to any one of claims 1-4, characterized in that, The thickness of the permanent magnet is three times or more the air gap between the iron core and the armature in the relay reset state.
6. The magnetic latching relay according to claim 1, characterized in that, It also includes an adhesive layer, and there are gaps between the inner wall of the mounting groove, the side wall of the iron core located in the mounting groove, the side wall of the permanent magnet, and the mounting plane; the adhesive layer is disposed in the gaps.
7. The magnetic latching relay according to claim 6, characterized in that, The adjacent gaps are connected to form a cavity, and the adhesive layer is formed by an adhesive filling the cavity.
8. The magnetic latching relay according to claim 7, characterized in that, The side wall of the mounting groove is provided with a first glue inlet that communicates with the cavity.
9. The magnetic latching relay according to claim 8, characterized in that, The first adhesive inlet extends in a direction parallel to the axial direction of the permanent magnet, and the length of the first adhesive inlet in the axial direction of the permanent magnet is greater than the thickness of the permanent magnet, so that the adhesive fills the gap between the circumferential sidewall of the permanent magnet and the inner wall of the mounting groove, as well as the gap between the sidewall of the permanent magnet facing the iron core, the sidewall of the iron core located in the mounting groove, and the sidewall of the mounting groove.
10. The magnetic latching relay according to claim 9, characterized in that, The side wall of the mounting groove is provided with an exhaust port that communicates with the cavity.
11. The magnetic latching relay according to claim 6, characterized in that, The adhesive layer includes a substrate and an adhesive covering the substrate.
12. The magnetic latching relay according to claim 8, characterized in that, It also includes a housing, the magnetic latching relay is located inside the housing, and the housing is provided with a second glue inlet, which communicates with the first glue inlet.
13. The magnetic latching relay according to claim 1, characterized in that, It also includes reeds, springs, moving contacts, and stationary contacts; The spring is located on the side of the armature facing away from the iron core, and the moving contact is located on the side of the spring facing the iron core; The stationary contact and the moving contact are respectively set; One end of the spring is connected to the armature, and the other end is connected to the yoke. The spring is used to provide a restoring reaction force for the armature.
14. The magnetic latching relay according to claim 1, characterized in that, The coil frame is provided with a wire guide groove and a winding window. A coil made of enameled wire is wound in the winding window. The enameled wire has two connecting sections. The coil frame is provided with terminals corresponding to the connecting sections on the side near the mounting plane. One end of the connecting section is located in the winding window, and the other end extends outside the winding window and connects to the terminal through the wire guide groove. The part of the connecting section near the circumferential sidewall of the coil frame is located in the wire guide groove.