Magnetic latching relay with shielding case

Abstract

The utility model belongs to the technical field of relays, and particularly relates to a magnetic latching relay with a shielding cover, which comprises a relay shell assembled by a base and a cover plate, and a shielding mechanism arranged outside the relay shell, wherein a contact assembly, an armature assembly, a coil assembly and a linkage plate are arranged in the relay shell to realize circuit on-off control; the shielding mechanism is composed of a first shielding case, a second shielding case and an interlayer, all parts of the shielding mechanism are accurately assembled through positioning columns and positioning holes, a groove in an inlet of the inner wall of the assembly end facilitates installation and alignment, a honeycomb groove is formed in one side of the interlayer, an interference magnetic field can be reflected and scattered many times, more induction currents are generated, and the magnetic shielding performance is greatly improved; the rubber gasket on the inner side of the shielding cover can prevent magnetic field leakage and absorb shock, the auxiliary fixing lugs enhance the installation firmness of the shielding cover, the relay effectively resists an external interference magnetic field through the structural design, misoperation is reduced, and the working stability and reliability in a complex electromagnetic environment are remarkably improved.

Description

Technical Field

[0001] This utility model belongs to the field of relay technology, specifically a magnetic latching relay with a shield. Background Technology

[0002] A magnetic latching relay is a type of relay that uses a permanent magnet to hold the contact state. It has advantages such as low power consumption, no temperature rise, and reliable contact holding. It is widely used in smart meters, industrial control, smart homes and other fields. It can realize the on-off control and state holding of circuits, and can effectively improve the stability and reliability of the system.

[0003] The existing magnetic latching relay shield mainly consists of the following components: iron core, coil, permanent magnet, and contact system. Its working principle is as follows: when the coil is energized, the generated magnetic field interacts with the magnetic field of the permanent magnet, causing the contacts to actuate; after the coil is de-energized, the magnetic field of the permanent magnet keeps the contacts in their actuated state until the next energization of the coil generates an opposite magnetic field to change their state.

[0004] The existing magnetic latching relay shields have the following drawbacks: their magnetic shielding performance is insufficient, most shields only have basic shielding structures and lack efficient means to handle interfering magnetic fields. When facing complex electromagnetic environments, external interfering magnetic fields can easily penetrate the shields and affect the normal operation of the relay, causing frequent malfunctions and unstable operation. They are also difficult to effectively weaken interfering magnetic fields and cannot meet the requirements for high stability and reliability of relays in complex electromagnetic environments. Therefore, a new magnetic latching relay shield is proposed to address these problems. Utility Model Content

[0005] To overcome the shortcomings of existing magnetic latching relays, a magnetic latching relay with a shield is proposed.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: The magnetic latching relay with a shielding cover of this utility model includes a relay housing assembled by a base and a cover plate. Three contact assemblies are fixedly assembled in the base. Each contact assembly includes a stationary plate assembly and a corresponding moving plate assembly. A stationary contact is fixedly provided on the stationary plate assembly. A spring assembly is fixedly provided on the moving plate assembly. A moving contact opposite to the stationary contact is fixedly provided on the spring assembly. An armature assembly is rotatably assembled in the base. A coil assembly for reversing the armature assembly is fixedly provided near the middle position in the base. A linkage plate for linking the armature assembly and the spring assembly to achieve on / off switching is movably arranged in the base. A shielding mechanism for blocking external interference magnetic fields is assembled on the outside of the relay housing. The shielding mechanism includes a first shielding cover and a second shielding cover, and a partition is provided between the first shielding cover and the second shielding cover.

[0007] Preferably, the outer wall of the relay housing is provided with a first positioning post for fixing the first shielding cover, the first shielding cover is provided with a first positioning hole that cooperates with the first positioning post, the first shielding cover is provided with a second positioning hole for assembling the partition, one side of the partition is provided with a second positioning post that cooperates with the second positioning hole, and the other side of the partition is provided with a third positioning post for assembling the second shielding cover, the second shielding cover is provided with a third positioning hole that cooperates with the third positioning post.

[0008] Preferably, the first shield, the second shield, and the inner wall inlet of the assembly end of the partition are all provided with bevels.

[0009] Preferably, the first shield, the second shield, and the partition are all made of metal.

[0010] Preferably, both the first shield and the second shield are provided with rubber pads on their inner sides.

[0011] Preferably, the outer walls on both sides of the relay housing are provided with two sets of opposing auxiliary fixing ears for limiting the first shield. The entrance of the auxiliary fixing ears is provided with an arc-shaped guide bevel, and the distance between the two sets of opposing auxiliary fixing ears is less than the width of the first shield in millimeters.

[0012] Preferably, the partition layer has several honeycomb grooves on the side away from the relay housing.

[0013] Preferably, the first shield, the second shield, and the partition are all U-shaped structures.

[0014] The beneficial effects of this utility model are:

[0015] 1. The shielding mechanism designed in this utility model includes a first shielding cover, a second shielding cover, and a partition layer. According to the principle of electromagnetic induction, when an external interference magnetic field passes through these metal components, a reverse magnetic field is generated to weaken the interference magnetic field, providing the relay with strong anti-interference capability, ensuring its stable operation in complex electromagnetic environments, and effectively reducing malfunctions caused by magnetic field interference.

[0016] 2. The design of the honeycomb groove on the side of the partition away from the relay housing allows the interfering magnetic field to be reflected and scattered multiple times by the inner wall of the honeycomb groove when it passes through the partition. At the same time, the increased surface area allows more magnetic fields to interact with it and generate induced current, further consuming magnetic field energy. This greatly improves the magnetic shielding performance of the partition and significantly enhances the stability and reliability of the relay when it is working in a complex electromagnetic environment. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a side view of the structure of this utility model;

[0019] Figure 2 This is a front view of the overall structure of this utility model;

[0020] Figure 3 This is a cross-sectional view of the shielding mechanism of this utility model;

[0021] Figure 4 This is a structural diagram of the honeycomb groove in the partition layer of this utility model;

[0022] Figure 5 This is a structural diagram of the base after the cover plate of this utility model has been removed;

[0023] Legend:

[0024] 1. Relay housing; 101. Base; 102. Cover plate; 2. Contact assembly; 201. Stationary contact assembly; 2011. Stationary contact; 202. Moving contact assembly; 203. Spring assembly; 2031. Moving contact; 3. Coil assembly; 4. Armature assembly; 5. Linkage plate; 6. Shielding mechanism; 601. First shielding cover; 602. Second shielding cover; 603. Partition; 7. First positioning post; 8. First positioning hole; 9. Second positioning hole; 10. Second positioning post; 11. Third positioning post; 12. Third positioning hole; 13. Bevel; 14. Rubber gasket; 15. Auxiliary fixing lug; 16. Honeycomb groove. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] Specific implementation examples are given below.

[0027] Please see Figures 1-5The present invention discloses a magnetic latching relay with a shield, comprising a relay housing 1 assembled from a base 101 and a cover plate 102. Three contact assemblies 2 are fixedly mounted within the base 101. Each contact assembly 2 includes a stationary contact assembly 201 and a corresponding moving contact assembly 202. A stationary contact 2011 is fixedly mounted on the stationary contact assembly 201, and a reed assembly 203 is fixedly mounted on the moving contact assembly 202. A moving contact 2031, opposite to the stationary contact 2011, is fixedly mounted on the reed assembly 203. An armature assembly 4 is rotatably mounted within the base 101. A coil assembly 3 for reversing the armature assembly 4 is fixedly mounted near the center of the base 101. A linkage plate 5 is movably mounted within the base 101 for linking the armature assembly 4 with the reed assembly 203 to achieve on / off switching. The outer surface of the electrical housing 1 is equipped with a shielding mechanism 6 for blocking external interference magnetic fields. The shielding mechanism 6 includes a first shielding cover 601 and a second shielding cover 602. A partition 603 is provided between the first shielding cover 601 and the second shielding cover 602. The outer wall of the relay housing 1 is provided with a first positioning post 7 for fixing the first shielding cover 601. The first shielding cover 601 is provided with a first positioning hole 8 that cooperates with the first positioning post 7. The first shielding cover 601 is provided with a second positioning hole 9 for assembling the partition 603. A second positioning post 10 that cooperates with the second positioning hole 9 is provided on one side of the partition 603. A third positioning post 11 that assembles the second shielding cover 602 is provided on the other side of the partition 603. A third positioning hole 12 that cooperates with the third positioning post 11 is provided on the second shielding cover 602.During operation, when current flows through coil assembly 3, according to Ampere's law, the current generates a magnetic field around it. This magnetic field exerts a magnetic force on armature assembly 4. Since armature assembly 4 can rotate within base 101, it rotates under the drive of the magnetic force. The rotation of armature assembly 4 drives the connected linkage plate 5 to move. Linkage plate 5 then pushes reed assembly 203, causing the moving contact 2031 on moving plate assembly 202 to move closer to or further away from the stationary contact 2011 on stationary plate assembly 201, thereby realizing the connection and disconnection of the circuit. The shielding mechanism 6 set outside the relay housing 1, based on the principle of electromagnetic induction, prevents external interference magnetic fields from entering the relay housing 1. After passing through the first shielding cover 601, the partition 603, and the first shielding cover 601, the external interference magnetic field is blocked. When the second shielding cover 602 is used, an induced current is generated in these metal components. This induced current then generates a magnetic field opposite to the direction of the interfering magnetic field, thus weakening and shielding the interfering magnetic field. The cooperation between the positioning post and the positioning hole is based on the principle of mechanical assembly. Through precise dimensional matching, the components are accurately fixed in space, ensuring the stability of the relative positions between the components and enabling the relay to operate normally. The shielding mechanism 6 significantly improves the relay's resistance to external interference magnetic fields, reduces malfunctions caused by external magnetic field interference, and greatly enhances the stability and reliability of the relay's operation, ensuring that it can accurately perform circuit switching tasks even in complex electromagnetic environments.

[0028] Furthermore, the inner wall inlets of the assembly ends of the first shielding cover 601, the second shielding cover 602, and the partition 603 are all provided with bevels 13. The materials of the first shielding cover 601, the second shielding cover 602, and the partition 603 are all metal. During operation, when the first shielding cover 601 is assembled with the relay housing 1, and the partition 603 is assembled with the first shielding cover 601 and the second shielding cover 602, the bevels 13 can play a guiding role. This makes it easier for the components to align when they are connected, reducing the probability of assembly difficulties due to positional deviations. From the perspective of electromagnetic shielding principles, the metal material gives the shielding mechanism basic and crucial magnetic shielding capabilities, which is the core element for effectively blocking external interference magnetic fields and provides a strong guarantee for creating a stable electromagnetic environment inside the relay.

[0029] Furthermore, rubber pads 14 are provided on the inner sides of both the first shielding cover 601 and the second shielding cover 602. During operation, the rubber pads 14 have good elasticity and flexibility. After assembly, the rubber pads 14 fill the tiny gaps between the shielding cover and the relay housing 1. Based on the sealing principle, this filling effect effectively prevents external interference magnetic fields from entering the relay through these tiny gaps. In addition, the rubber material also has shock absorption properties. When there is vibration in the environment where the relay is located, the rubber pads 14 can absorb and buffer the vibration energy, reduce the impact of vibration on the precision components inside the relay, and prevent the components from loosening or shifting due to vibration, thereby affecting the normal operation of the relay.

[0030] Furthermore, both outer walls of the relay housing 1 are provided with two sets of opposing auxiliary fixing ears 15 for limiting the first shielding cover 601. The entrance of each auxiliary fixing ear 15 is provided with an arc-shaped guide bevel, and the distance between the two sets of opposing auxiliary fixing ears 15 is less than the width of the first shielding cover 601 by 0.5 mm. During operation, when assembling the first shielding cover 601, the arc-shaped guide bevel plays an important guiding role. According to the guiding principle in mechanical assembly, when the first shielding cover 601 approaches the auxiliary fixing ears 15, the arc-shaped guide bevel can guide the first shielding cover 601 to smoothly insert between the auxiliary fixing ears 15. The spacing between the auxiliary fixing ears 15 is 0.5 mm less than the width of the first shielding cover 601. This causes the first shielding cover 601 to be subjected to an inward squeezing force from the auxiliary fixing ears 15 after insertion. Based on the principle of friction and fastening, the friction generated by this squeezing force can firmly fix the first shielding cover 601 between the auxiliary fixing ears 15, preventing it from shifting due to vibration, external forces, or other factors during use. The auxiliary fixing ears 15 and related design greatly enhance the firmness and stability of the installation of the first shielding cover 601, ensuring that the shielding mechanism maintains good shielding performance during long-term use and improving the overall quality and reliability of the product.

[0031] Furthermore, the partition 603 has several honeycomb slots 16 on the side away from the relay housing 1. During operation, the structural design principle of the honeycomb slots 16 is such that when an external interference magnetic field passes through the partition 603, the numerous inner walls of the honeycomb slots 16 will reflect and scatter the magnetic field multiple times. According to the principles of reflection and scattering in electromagnetism, when the interference magnetic field encounters different medium interfaces (i.e., the interface between the inner wall of the honeycomb slot and the air), reflection will occur, and some magnetic field energy will be reflected back. At the same time, when the magnetic field propagates in the complex honeycomb structure, it will continuously change direction and scatter. In this process, the magnetic field energy is gradually consumed and attenuated. In addition, since the honeycomb slots 16 increase the surface area of ​​the partition 603, according to the principle of electromagnetic induction, more magnetic fields will interact with the partition 603, generating more induced current, further consuming magnetic field energy, thereby effectively weakening the strength of the interference magnetic field passing through the partition 603, greatly improving the magnetic shielding performance of the partition 603, and further improving the stability and reliability of the relay in complex electromagnetic environments, enabling the product to better adapt to various harsh working environments.

[0032] Furthermore, the first shielding cover 601, the second shielding cover 602, and the partition 603 are all U-shaped structures. During operation, the U-shaped structure can first improve the convenience of assembly, and the U-shaped structure can tightly surround the relay housing 1 to form a full-round wrap around the relay. When external interference magnetic fields are incident from all directions, the three sides of the U-shaped structure can shield the magnetic field. The U-shaped structure significantly improves the wrapping and protection range of the shielding mechanism for the relay.

[0033] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A magnetic latching relay with a shield, comprising a relay housing (1) assembled from a base (101) and a cover plate (102), characterized in that: Three contact assemblies (2) are fixedly assembled inside the base (101). Each contact assembly (2) includes a stationary plate assembly (201) and a corresponding movable plate assembly (202). A stationary contact (2011) is fixedly disposed on the stationary plate assembly (201), and a spring assembly (203) is fixedly disposed on the movable plate assembly (202). A movable contact (2031) opposite to the stationary contact (2011) is fixedly disposed on the spring assembly (203). An armature assembly (4) is rotatably assembled inside the base (101). A coil assembly (3) for re-swinging the armature assembly (4) is fixedly installed near the middle position of the base (101). A linkage plate (5) for linking the armature assembly (4) and the reed assembly (203) to achieve on / off switching is movably installed in the base (101). A shielding mechanism (6) for blocking external interference magnetic fields is assembled on the outside of the relay housing (1). The shielding mechanism (6) includes a first shielding cover (601) and a second shielding cover (602). A partition (603) is provided between the first shielding cover (601) and the second shielding cover (602).

2. A magnetic latching relay with a shielding cover according to claim 1, characterized in that: The outer wall of the relay housing (1) is provided with a first positioning post (7) for fixing the first shielding cover (601). The first shielding cover (601) is provided with a first positioning hole (8) that cooperates with the first positioning post (7). The first shielding cover (601) is provided with a second positioning hole (9) for assembling the partition (603). The partition (603) is provided with a second positioning post (10) that cooperates with the second positioning hole (9) on one side. The partition (603) is provided with a third positioning post (11) for assembling the second shielding cover (602) on the other side. The second shielding cover (602) is provided with a third positioning hole (12) that cooperates with the third positioning post (11).

3. A magnetic latching relay with a shielding cover according to claim 1, characterized in that: The inner wall inlets of the assembly ends of the first shield (601), the second shield (602), and the partition (603) are all provided with bevels (13).

4. A magnetic latching relay with a shielding cover according to claim 1, characterized in that: The first shield (601), the second shield (602), and the partition (603) are all made of metal.

5. A magnetic latching relay with a shielding cover according to claim 1, characterized in that: Both the first shield (601) and the second shield (602) have rubber pads (14) on their inner sides.

6. A magnetic latching relay with a shielding cover according to claim 1, characterized in that: The outer walls of both sides of the relay housing (1) are provided with two sets of opposing auxiliary fixing ears (15) for limiting the first shield (601). The entrance of the auxiliary fixing ears (15) is provided with an arc-shaped guide bevel, and the distance between the two sets of opposing auxiliary fixing ears (15) is less than the width of the first shield (601) by 0.5 mm.

7. A magnetic latching relay with a shielding cover according to claim 1, characterized in that: The partition (603) has several honeycomb grooves (16) on the side away from the relay housing (1).

8. A magnetic latching relay with a shielding cover according to claim 1, characterized in that: The first shield (601), the second shield (602), and the partition (603) are all U-shaped structures.

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