High-reliability two-way magnetic latching relay

Abstract

The invention discloses a high-reliability two-way magnetic latching relay, which comprises three parts, namely a control loop part, a shell part, a magnetic circuit system and a push rod part, the control loop part is composed of two groups of control loops, the two groups of control loops are provided with control loop lead-out pins, and the magnetic circuit system is connected with the push rod part through the control loop lead-out pins. The four pins are respectively a first pin, a second pin, a third pin and a fourth pin, the first pin extends to a position between the third pin and the fourth pin from the outer part of the shell below the front parts of the second pin and the third pin, and the first pin is riveted with a contact point and the fourth pin is riveted with a reed to form a loop group; and the second pin and the third pin form another loop. The reliability of the service life of the product can be improved through reasonable design, good insulation performance, adoption of high-quality contact materials and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of relay design and manufacturing, and relates to a highly reliable dual-channel magnetic latching relay.

Background Art

[0002] In the current era of rapid technological development, magnetic latching relays are moving forward in the direction of miniaturization and integration, striving to meet the increasingly stringent volume and weight standards of modern equipment. Looking ahead, such relays not only need to be more stable and durable, but also have a significantly extended service life. At the same time, the attention to power consumption and energy utilization efficiency continues to rise. With the help of advanced new materials and innovative processes, efforts are being made to improve energy efficiency and reduce power consumption, thereby achieving the goal of environmental protection and energy conservation.

[0003] As a unique member among them, the dual-channel magnetic latching relay realizes precise and automatic on-off switching of the circuit through two control loops and is widely used in many fields such as smart meters. Especially as the old mechanical meters are gradually replaced by smart meters, the market demand for dual-channel magnetic latching relays has shown a rapid growth trend.

[0004] However, it cannot be ignored that the contact materials that play a key role in conducting electricity and switching on and off in the loop, whether it is the static contact or the moving contact part, must possess a series of excellent properties to match the current application scenarios. First of all, good electrical conductivity is crucial, which is usually measured by resistivity or conductivity. Just like silver, with its excellent electrical conductivity, it has established itself in fields with extremely high requirements for electrical signal transmission such as high-frequency circuits and precision instruments. This is because high electrical conductivity can effectively reduce the contact resistance, minimize the unnecessary loss of electrical energy and the resulting heat generation problems, thereby avoiding the risk of contact damage caused by overheating.

[0005] Closely related to this is thermal conductivity, which intuitively reflects the ability of the material to conduct heat. When the contact is closed and current passes through, heat will inevitably be generated. At this time, if the material has excellent thermal conductivity, it can dissipate the heat in time, just like installing a "safety valve" for the contact, effectively preventing irreversible damage to the contact caused by excessive temperature. Silver also performs excellently in this regard.

[0006] During the actual use process, the contacts open and close frequently and will inevitably suffer mechanical wear, which puts extremely high requirements on the wear resistance of the material. Alloy materials such as silver alloys, tungsten-silver alloys, and palladium alloys often appear in high-load circuits and high-voltage circuits due to their outstanding wear resistance ability, ensuring that the contacts can still maintain a good contact state after long-term frequent use, thereby extending the service life of the contacts.

[0007] Antioxidant property is also a crucial performance that the contact material must possess. Since the contacts are exposed to air for a long time, their surfaces are extremely prone to oxidation, and then an oxide film is formed. This oxide film is like a "stumbling block" across the path of current transmission, which will cause the contact resistance to increase sharply and seriously affect the conductivity. Take silver as an example. In an environment without sulfur, its antioxidant and anti-discoloration properties are acceptable. However, once in an atmosphere containing sulfur or sulfides, a brown to black silver sulfide film will rapidly form on its surface, instantly increasing the contact resistance of the contacts and greatly reducing the conductivity.

[0008] Furthermore, hardness, as an index to measure the ability of a material to resist local deformation, especially plastic deformation, indentation or scratching, also plays a crucial role. Appropriate hardness can ensure that the contacts maintain a stable shape during the contact process and are not prone to deformation, thus guaranteeing a stable contact state. Due to the low hardness of pure silver contacts, they are prone to welding during contact. Therefore, in many actual application scenarios, they often need to be alloyed with other materials to improve the hardness.

[0009] Finally, the anti-welding property cannot be underestimated either. When the contacts are closed and a strong current passes through, it may cause the surfaces of the contacts to melt instantly. If the anti-welding property of the material is not good, these melted surfaces may be welded together. Once the circuit needs to be disconnected, the contacts cannot be reliably separated, which will undoubtedly lead to serious circuit failures.

[0010] As the fields of smart meters, high-voltage electrical appliances, etc. are advancing towards the goals of higher reliability and smaller size, the inherent performance shortcomings of traditional contact materials, such as common silver-based and copper-based alloys, have become increasingly prominent. In terms of wear resistance, the wear rate of traditional silver-based materials is relatively high. After long-term frequent opening and closing, the surfaces of the contacts are severely worn, making it difficult to ensure stable contact performance. Although copper-based alloys have slightly higher hardness, they are weak in the ability to resist arc erosion. After the contacts are frequently subjected to arc impacts, pits are easily formed on the surfaces, which will also lead to contact failure.

[0011] Antioxidant property is even a major "weakness" of traditional materials. The disadvantages of silver-based materials in a sulfur-containing environment have been mentioned above. And for copper-based alloys in a high-temperature environment, the oxidation rate is extremely fast, and the oxide layer continuously thickens, causing the contact resistance to continue to rise and seriously affecting the conductivity. Even if additional plating protection measures are taken, it not only increases the process complexity but also is difficult to fundamentally solve the problem.

[0012] Regarding the anti-welding property, traditional silver-based materials have a relatively large welding force. In the event of sudden situations such as short circuits or overloads in the circuit, the contacts are extremely prone to adhesion, which undoubtedly poses a huge hidden danger to the circuit safety; the situation of copper-based materials is similar, and even the welding force is higher. Once a failure occurs, the risk of causing serious consequences such as fires cannot be underestimated.

[0013] In summary, when traditional contact materials face the ever-changing development needs in fields such as smart grids and high-voltage electrical appliances, they have become powerless and difficult to meet the stringent standards for key performance such as wear resistance, oxidation resistance, and anti-welding. Therefore, it is urgent to develop new contact materials with excellent comprehensive performance. Only in this way can we provide solid and reliable support for the continuous progress of magnetic latching relays and related fields.

Summary of the Invention

[0014] The present invention provides a highly reliable dual-channel magnetic latching relay to solve the problem of poor performance of traditional contact materials.

[0015] To solve the above technical problems, the solution adopted by the present invention is as follows:

[0016] A highly reliable dual-channel magnetic latching relay includes three main parts, namely a control circuit part, a housing part, a magnetic circuit system and a push rod part. The control circuit part consists of two groups of control circuits. The two groups of control circuits are designed with control circuit lead-out pins, namely the first pin, the second pin, the third pin, and the fourth pin. The first pin extends from the outside of the front lower part of the housing between the second pin and the third pin to between the third pin and the fourth pin. The first pin riveted contact and the fourth pin riveted upper reed combination form a circuit group. The second pin and the third pin form another circuit. The first pin consists of a static contact and a static reed seat, and is connected to each other by a riveting process. The first pin is in an L shape. A device cavity protrudes from the front lower part of the dual-channel magnetic latching relay of the present invention. The cavity is surrounded by a plastic body. After the lower cover is closed, it is completely separated from the outside, improving the insulation performance with each conductor and improving the sealing performance, avoiding the influence of dust, foreign objects, and air humidity on the dual-channel magnetic latching relay.

[0017] The design that the first pin penetrates from the front lower part of the product utilizes a sufficient distance to avoid the influence of the magnetic field generated by the current passing through the conductor during the use of the relay on the magnetic circuit system, resulting in functional failure. The contact material used in the circuit is a material with good electrical conductivity, thermal conductivity, wear resistance, oxidation resistance, moderate hardness, and good anti-welding performance to improve the service life of the relay.

[0018] The reasonable design, good insulation performance, and use of high-quality contact materials of the products of the present invention can improve the reliability of the product life.

[0019] Furthermore, each control circuit of the dual-channel control circuit part consists of a moving reed seat, a moving reed, a moving contact, a static reed seat, and a static contact. The static contact material of the present invention is made by the pre-oxidized alloy powder method, and the moving contact material is made by the alloy internal oxidation method. The contacts made by different processes are used in combination in the product. Alloy internal oxidation method: can effectively control the microstructure of the material and improve the electrical performance of the material.

[0020] Pre-oxidized alloy powder method: By pre-oxidation treatment, the processing performance and electrical performance of the material are improved.

[0021] Furthermore, the moving contact, static contact, moving reed, static reed seat, and moving reed seat are all connected to each other by riveting. The moving contact is made of moving contact material, and the static contact is made of static contact material.

[0022] Furthermore, there are 2 designed moving reed seats, namely the moving reed seat of the third pin and the moving reed seat of the fourth pin. The static reed seat of the first pin and the moving reed seat of the fourth pin are connected to form a control loop, and the static reed seat of the second pin and the moving reed seat of the third pin are connected to form a control loop.

[0023] Furthermore, there are 2 designed groups of moving reeds, and each group consists of 3 pieces used overlapping.

[0024] Furthermore, there are 2 designed static reed seats, namely the static reed seat of the first pin and the static reed seat of the second pin. The static reed seat of the first pin and the fourth moving reed seat are connected to form a control loop, and the static reed seat of the second pin and the moving reed seat of the third pin are connected to form a control loop.

[0025] Furthermore, the housing part is composed of an outer shell, an upper cover, and a lower cover.

[0026] Furthermore, the magnetic circuit system and the push rod part are composed of a coil assembly, a bracket, a magnet assembly, and a push rod.

[0027] Furthermore, the coil assembly includes a bobbin, enameled wire, lead pins, an iron core, and a yoke.

[0028] Furthermore, the push rod is designed with 3 slots for connecting the magnet assembly and 2 moving reeds.

[0029] The technical principle of the present invention:

[0030] I. Overall structure layout principle

[0031] 1. The whole is divided into a control loop part, a housing part, a magnetic circuit system, and a push rod part. Each part works together to realize the function of the relay. The control loop part, as the core electrical signal control unit, is composed of two independent control loops. Each loop contains components such as a moving reed seat, a moving reed, a moving contact, a static reed seat, and a static contact, and forms a complete circuit through specific pin connections. This dual-loop design can achieve more complex circuit control logics and meet diverse application requirements. For example, in an intelligent electricity meter, it can accurately switch different metering or control circuits.

[0032] 2. The housing part consists of an outer shell, an upper cover, and a lower cover. The lower cover is fitted with a device cavity protruding forward and downward. The periphery of the device cavity is wrapped by a plastic body. When the entire relay is assembled, it can effectively isolate the inside from the outside completely. On the one hand, it greatly improves the insulation performance between conductors, preventing problems such as electric leakage and short circuit caused by poor insulation and ensuring stable transmission of electrical signals. On the other hand, the good sealing effectively avoids problems such as dust and foreign objects entering the inside and causing component wear and short circuit, as well as oxidation and corrosion caused by air humidity, providing guarantee for the long-term stable operation of the relay.

[0033] II. Control Circuit Connection and Pin Layout Principle

[0034] 1. Two groups of control circuits are designed with four control circuit lead-out pins, namely the first pin, the second pin, the third pin, and the fourth pin. The first pin extends from the outside of the lower front of the second pin and the third pin to between the third pin and the fourth pin. This unique through design makes good use of sufficient distance to avoid the interference of the magnetic field generated by the current passing through the conductor during the use of the relay to the magnetic circuit system from the spatial layout. Since the magnetic circuit system is relatively sensitive to the magnetic field environment, if affected by the external current magnetic field, it may cause the magnetic field line distribution of the magnet combination to be disordered, and then the push rod cannot act normally, ultimately resulting in the failure of the relay function. The reasonable layout of the first pin effectively solves this potential problem.

[0035] 2. In terms of the specific connection method, the riveted contact of the first pin and the riveted upper reed combination of the fourth pin form a circuit group, and the second pin and the third pin form another circuit. There are 2 moving reed seats, namely the moving reed seat of the third pin and the moving reed seat of the fourth pin, and there are also 2 static reed seats, namely the static reed seat of the first pin and the static reed seat of the second pin. The circuit is built according to the rule that the static reed seat of the first pin is connected to the moving reed seat of the fourth pin to form a control circuit, and the static reed seat of the second pin is connected to the moving reed seat of the third pin to form another control circuit. There are 2 groups of moving reed pieces in each group of control circuits, and each group consists of 3 pieces overlapping and used together. This multi-layer overlapping structure not only increases the contact reliability but also helps to disperse the current, reduce local overheating, and improve the stability and durability of the circuit.

[0036] III. Contact Material and Process Principle

[0037] The contact material in the circuit is of crucial importance. The static contact material is made by the pre-oxidized alloy powder method, and the moving contact material is made by the alloy internal oxidation method, and the two are used in combination.

[0038] Principle of pre-oxidized alloy powder method: By pre-oxidizing the raw materials, a dense oxide film is formed on the material surface or the microstructure of the material is changed. This oxide film can not only improve the oxidation resistance of the material, prevent the increase of contact resistance due to oxidation during subsequent use and affect the electrical conductivity, but also improve the processing performance of the material, making it smoother during subsequent forming, riveting and other processing processes, and not prone to defects such as cracks and deformation. Finally, the electrical performance of the material is improved, ensuring that the static contact can conduct current stably and reliably, withstand wear and resist welding during long-term use.

[0039] Principle of internal oxidation of alloy method: In the process of alloy preparation, this method uses specific oxidation conditions to form uniformly distributed oxide particles inside the alloy. These oxide particles can effectively pin the grain boundaries and refine the grains, thereby controlling the microstructure of the material. The refined grain structure helps to improve the electrical conductivity of the material because fewer grain boundaries mean less electron scattering. At the same time, the presence of oxide particles enhances the hardness and wear resistance of the material, enabling the moving contact to resist mechanical wear during frequent opening and closing processes, reducing the fluctuation of contact resistance, maintaining a good conductive state, and prolonging the service life of the moving contact.

[0040] IV. Coordination principle of magnetic circuit system and push rod

[0041] 1. The magnetic circuit system and the push rod part are composed of a coil assembly, a bracket, a magnet assembly, and a push rod. The coil assembly includes a skeleton, enameled wire, lead pins, an iron core, and a yoke. When an electric current is applied to the coil assembly, the enameled wire wound around the iron core generates a magnetic field, and the iron core and the yoke guide the magnetic field distribution, magnetizing the magnet assembly to generate magnetic force.

[0042] 2. The push rod is designed with 3 slots for connecting with the magnet assembly and 2 moving reeds. Under the action of the magnetic force of the magnet assembly, the push rod can accurately drive the moving reed to move, realizing the rapid closing or opening of the moving contact and the static contact, and completing the circuit switching. This tight mechanical connection and magnetic force drive coordination mechanism ensure the accuracy and timeliness of the relay action, and can respond efficiently at the moment when the circuit needs to be switched, meeting the requirements of rapid on-off of the relay in various application scenarios.

[0043] In summary, through the carefully designed overall structure, reasonable control circuit layout, unique contact material process, and highly efficient coordinated magnetic circuit system and push rod, the present invention comprehensively improves the reliability, stability and service life of the dual-channel magnetic latching relay.

[0044] Compared with the prior art, the present invention has the following technical advantages:

[0045] 1. Structural design advantages

[0046] Adopting a unique three - part structure, the control loop part consists of two groups of loops, and the first pin penetrates from a specific position, reasonably utilizing the space distance to avoid the interference of current magnetic fields on the magnetic circuit system, ensuring the stable function of the relay, and achieving a breakthrough in layout rationality compared with the prior art.

[0047] 2. Insulation and Sealing Advantages

[0048] There is a protruding device cavity in the front - lower part of the double - path magnetic latching relay, which is wrapped by a plastic body all around. After the lower cover is closed, it is completely separated from the outside, greatly improving the insulation performance between conductors, effectively avoiding the influence of dust, foreign objects, and air humidity, providing a good operating environment for internal components, extending the service life, and solving the problem that the prior art is vulnerable to environmental factors.

[0049] 3. Advantages of Static Contact Material Performance

[0050] Wear resistance: The wear rate is reduced by 47.5% - 65.0% compared with traditional materials, greatly reducing mechanical wear during use and significantly extending the service life of the contacts.

[0051] Oxidation resistance: The oxidation resistance is increased by 66.7% - 87.0%, enabling it to adapt to more severe environmental conditions, maintaining stable electrical conductivity, and overcoming the drawback that traditional materials are prone to oxidation, resulting in an increase in contact resistance.

[0052] Hardness: The hardness is increased by 52.8% - 84.8%, enhancing mechanical stability, making the contacts less likely to deform during contact, and maintaining a reliable contact state.

[0053] Anti - welding property: The welding force is reduced by 41.0% - 69.1%, effectively reducing the contact adhesion failure, improving the operating safety of the relay, and reducing the risk of circuit failure caused by welding.

[0054] 4. Advantages of Moving Contact Material Performance

[0055] It is significantly superior to the traditional AgSnO2 material in all key performance indicators such as anti - welding force, life, and conductivity, with higher reliability, durability, and efficiency, and can better meet the working requirements of the double - path magnetic latching relay for frequent opening and closing and stable conductivity.

[0056] 5. Synergistic Advantages of Comprehensive Performance

[0057] Although the conductivity and thermal conductivity of the static contact material are slightly inferior to traditional materials, through overall targeted design, such as reasonable structural layout, excellent insulation and sealing, and complementary performance of moving and static contact materials, the short - board is made up, optimizing the overall performance of the relay. Compared with the prior art, significant technological progress has been made in durability and stability, and it can adapt to more complex and demanding application scenarios.

Description of the Drawings

[0058] Figure 1 It is the external view of the product of the present invention.

[0059] Figure 2 It is the schematic structural view of the product of the present invention.

[0060] Figure 3 It is the exploded view of the product of the present invention.

[0061] Figure 4 It is the schematic structural view of the first pin of the product of the present invention.

[0062] Figure 5 It is the schematic exploded view of the current flow direction of the product of the present invention.

Detailed Embodiments

[0063] The present invention will be further described in detail below in conjunction with the detailed embodiments and with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary and not intended to limit the scope of the present invention and its applications.

[0064] Embodiment 1

[0065] As Figures 1-3 shown, a highly reliable dual-channel magnetic latching relay of the present invention comprises three major parts, namely, a control circuit part, a housing part, a magnetic circuit system and a push rod part. The control circuit part consists of two sets of control circuits, and the two sets of control circuits are designed with control circuit lead-out pins, namely, a first pin, a second pin, a third pin and a fourth pin. The first pin extends from the outside of the front lower part of the second pin and the third pin to between the third pin and the fourth pin. The first pin riveting contact point and the fourth pin riveting upper reed combination form a loop group, and the second pin and the third pin form another loop.

[0066] Each set of control circuits of the dual-channel control circuit part consists of a moving reed base, a moving reed 1, a moving contact 2, a static reed base and a static contact 3.

[0067] There are 2 moving reed bases designed, namely, the third pin moving reed base 4 and the fourth pin moving reed base 5. The first pin static reed base 6 is connected to the fourth pin moving reed base 5 to form a control circuit, and the second pin static reed base 7 is connected to the third pin moving reed base 4 to form a control circuit.

[0068] There are 2 sets of moving reeds designed, and each set consists of 3 pieces used overlapping.

[0069] There are 2 static reed bases designed, namely, the first pin static reed base 6 and the second pin static reed base 7. The first pin static reed base 6 is connected to the fourth moving reed base 5 to form a control circuit, and the second pin static reed base 7 is connected to the third pin moving reed base 4 to form a control circuit.

[0070] The moving contact 2, the static contact 3, the moving reed 1, the static reed seat, and the moving reed seat are all connected to each other by riveting.

[0071] The housing part is composed of an outer shell 8, an upper cover 9, and a lower cover 10.

[0072] The magnetic circuit system and the push rod part are composed of a coil assembly (a bobbin 11, an enameled wire, lead pins 12, an iron core 13, a yoke 14), a bracket, a magnet assembly 15, and a push rod 16.

[0073] The push rod 16 is designed with 3 slots for connecting the magnet assembly 15 and 2 moving reeds 1.

[0074] As Figure 4 shown, the first pin is composed of a static contact and a static reed seat, and they are connected to each other by riveting. The shape of the first pin is L-shaped.

[0075] The design that the first pin penetrates from the front lower part of the dual-channel magnetic latching relay product of the present invention utilizes a sufficient distance to avoid the magnetic field generated by the current passing through the conductor during the use of the relay from affecting the magnetic circuit system and causing functional failure. The static contact material and the moving contact material used in the circuit are both materials with moderate electrical conductivity, thermal conductivity, wear resistance, oxidation resistance, hardness, and good anti-welding performance, which can effectively improve the service life of the relay.

[0076] The dual-channel magnetic latching relay of the present invention needs to work with a rated current and voltage in the control circuit. As Figure 5 shown, the current direction is shown by the red arrow. When the current passes through the first pin, the generated magnetic field around it has a certain influence on the magnetic circuit system of the dual-channel magnetic latching relay. Especially, the current at the moment of starting the dual-channel magnetic latching relay is 5 - 8 times the normal operating current, which is called inrush current in the electrical industry. Since the current increases, the magnetic field generated around the first pin also increases. This magnetic field will directly affect the jitter of the magnetic circuit system. The magnetic circuit system and the control circuit contacts are interlocked. The jitter of the contacts through which a large current passes will directly burn out the dual-channel magnetic latching relay, greatly shortening the service life of the dual-channel magnetic latching relay.

[0077] The special design of the first pin in the present invention can avoid the above risks. There is an innovation in the design layout, increasing the distance between the magnetic circuit system and the first pin, avoiding the influence of the magnetic field, with less interference, thus significantly improving the service life of the dual-channel magnetic latching relay.

[0078] The dual-circuit magnetic latching relay of the present invention has a relatively special design in appearance. A device cavity protrudes from the lower front of the product. The cavity is wrapped with a plastic body on all sides. When the lower cover is closed, it is completely isolated from the outside, thereby improving the insulation performance and sealing between the conductors and avoiding the influence of dust, foreign matter and air humidity on the product.

[0079] The static contact material is made by a pre-oxidized alloy powder method, which includes the following steps:

[0080] (1) Preparation of pre-oxidized titanium powder: The titanium powder is placed in an oxidation furnace, air is used as an oxidizing medium, and oxidized at 1180° C. for 1 h to obtain pre-oxidized titanium powder;

[0081] (2) Preparation of pre-oxidized iron raw material powder: ferrocene is added to deionized water, stirred to obtain a ferrocene emulsion, concentrated sulfuric acid and an additive (the additive is CuSO4·5H2O) are added, stirred to dissolve, irradiated with ultraviolet light with a redox potential of 4 V and a wavelength of 216 nm for 8 minutes, then filtered and washed with water until the pH value is neutral, and dried at 80°C to obtain a ferrocene redox catalyst; the dried ferrocene and FeSO4·7H2O are added to methanol and water in a volume ratio of 3:10 to obtain ferrocene. A mixed solution of ferrocene and FeSO4·7H2O, and then adding the ferrocene redox catalyst prepared above to the mixed solution, stirring to obtain a mixed emulsion of ferrocene and FeSO4·7H2O; adding the mixed emulsion of ferrocene and FeSO4·7H2O obtained above to a hydrogen peroxide solution with a mass concentration of 37.8%, stirring, heating the mixed emulsion to 70°C, and then keeping it warm for 75 minutes, filtering and washing with water until the pH value is neutral, drying at 75°C, and then crushing to obtain a pre-oxidized iron raw material powder;

[0082] The mass ratio of ferrocene to FeSO4·7H2O is 8:3, ferrocene accounts for 15.3% of the mass of ferrocene and FeSO4·7H2O after drying; the ferrocene redox catalyst accounts for 2.6% of the mass of ferrocene and FeSO4·7H2O after drying;

[0083] (3) Preparation of iron-based powder raw material: copper powder and nickel powder are uniformly suspended in anhydrous ethanol by atomization, and iron-based powder raw material and 0.2 wt% polyvinyl pyrrolidone are added thereto to fully disperse them to obtain a copper-nickel-based suspension, and then the suspension is subjected to thermal spraying technology to prepare iron-based powder; the iron-based powder is added to an oxidation furnace and oxidized in a gradient temperature rise system (stage 1: 500°C × 1h (pre-oxidation), stage 2: 1050°C × 3h (main oxidation)) to obtain an iron-based powder raw material;

[0084] In step (3), the thermal spraying parameters are as follows: the heat source is propane, the powder feeding rate is 82 g / min, the spraying distance is 95 mm, and the spraying time is 46 min; in the copper-nickel-based suspension, the mass concentration of copper is 24.6%, the mass concentration of nickel is 41.3%, and the mass concentration of the iron-based powder raw material (Fe) is 15.2%. The mass ratio of the iron-based powder raw material (Fe) to the copper-nickel-based suspension is 7.4%.

[0085] The iron-based powder raw material is composed of Fe-C powder, Fe-N powder, and Fe-Cu-Ti powder in a mass ratio of 2:2:1.

[0086] (4) Preparation of copper-based powder raw material: The pure copper powder is evenly suspended in anhydrous ethanol by atomization method, and pre-oxidized titanium powder is added thereto and fully dispersed to obtain a copper / titanium mixed suspension. Then, the copper-based powder is prepared by thermal spraying technology for the suspension.

[0087] (5) The pre-oxidized titanium powder prepared in step (1), the pre-oxidized iron raw material powder prepared in step (2), the iron-based powder raw material prepared in step (3), the copper-based powder prepared in step (4), and the pure nickel powder are mixed in proportion to obtain a mixed powder, and then the mixed powder is uniformly mixed by a ball mill. The mixed powder is thermally sprayed to prepare the static contact material.

[0088] The static contact material prepared in Example 1 of the present invention is subjected to performance testing with traditional silver-based materials and traditional copper-based materials. The experiment is repeated three times to obtain the average value. The test results are shown in the following table.

[0089]

[0090] As can be seen from the above table, the static contact material of Example 1 of the present invention has achieved a breakthrough improvement in the four key performances of wear resistance, oxidation resistance, hardness, and anti-welding:

[0091] The wear rate is reduced by 47.5%-65.0%, significantly extending the service life.

[0092] The oxidation resistance is improved by 66.7%-87.0%, which is suitable for harsh environments.

[0093] The hardness is increased by 52.8%-84.8%, enhancing the mechanical stability.

[0094] The welding force is reduced by 41.0%-69.1%, reducing the contact adhesion failure and improving the safety of the relay.

[0095] Conclusion: Although the conductivity and thermal conductivity of the static contact material in Embodiment 1 of the present invention are slightly inferior to traditional materials, through the targeted design of the present invention, the shortcoming can be made up. Therefore, the material of Embodiment 1 is particularly suitable for the application requirements of the dual-channel magnetic latching relay of the present invention, reflecting significant technological progress in terms of durability and stability.

[0096] The composition (mass percentage) of the movable contact material is as follows:

[0097] 1. Silver (Ag): 80.1% (matrix metal);

[0098] 2. Copper (Cu): 5.2% (enhancing conductivity and strength);

[0099] 3. Tin (Sn): 3.0% (forming SnO2 reinforcing phase);

[0100] 4. Nickel (Ni): 5.3% (refining grains and increasing hardness);

[0101] 5. Tungsten (W): 3.1% (increasing hardness and anti-welding property);

[0102] 6. Molybdenum (Mo): 1.0% (improving high-temperature stability);

[0103] 7. Indium (In): 0.2% (reducing contact resistance);

[0104] 8. Gallium (Ga): 0.2% (enhancing anti-welding property);

[0105] 9. Cobalt (Co): 0.5% (cooperatively refining grains);

[0106] 10. Cerium (Ce): 0.2% (rare earth purification effect);

[0107] 11. Lanthanum (La): 0.2% (refining oxide distribution);

[0108] 12. Antimony (Sb): 0.15% (inhibiting grain growth);

[0109] 13. Bismuth (Bi): 0.1% (improving wettability);

[0110] 14. Titanium (Ti): 0.1% (forming Ti-O nanoparticles);

[0111] 15. Iron (Fe): the balance.

[0112] The preparation method of the movable contact material includes the following steps:

[0113] (1) Vacuum melting: Melting the raw materials under a vacuum degree of 1.2×10 -3 Pa, at a temperature of 1180°C, and a cooling rate of 5.1×103 ℃ / s;

[0114] (2) Multi-stage hot rolling: Rolled in 5 passes at 720 °C, with a total reduction ratio of 56%. The rolling process is as follows: Passes 1-3: Reduction ratio of 12% each time (total reduction ratio of 36%); Intermediate annealing: 520 °C × 1 h (stress relief); Passes 4-5: Reduction ratio of 10% each time (total reduction ratio of 20%, total reduction ratio of 56%);

[0115] (3) Gradient internal oxidation: Pulse oxidation in oxygen at 380 °C and 0.2 MPa for 2.5 h, with oxygen interrupted for 10 min every 30 min (to promote uniform distribution of oxides);

[0116] (4) Cold rolling and annealing: Rolled in two stages, with a reduction ratio of 25% each time (total reduction ratio of 50%); Intermediate annealing: 420 °C × 0.5 h; Final annealing: 290 °C × 1 h (residual stress relief). After cold rolling, the surface is treated by alkaline polishing (NaOH:Na2CO3 = 1:3, voltage 4 V, to avoid corrosion of high melting point phases);

[0117] (5) Precision forming and surface treatment - wire cutting: Use a kerosene-based working fluid (to reduce thermal damage); Cleaning: Plasma cleaning (Ar gas, power 90 W, time 6 min); Vacuum drying: 82 °C × 3 h (vacuum degree 5 × 10 -3 Pa), and finally the moving contact material is obtained.

[0118] The performance of the moving contact material prepared in Example 1 of the present invention was tested and compared with that of the traditional AgSnO2 material. The experiment was repeated three times and the average value was calculated. The test results are shown in the following table.

[0119] Performance indicators Moving contact material of Example 1 <![CDATA[Traditional AgSnO2 material]]> Conductivity (S / m) <![CDATA[8.8×10 5 > <![CDATA[7.2×10 5 > Anti-welding force (N) 68.2 38.1 Lifespan (cycles) <![CDATA[1.8×10 7 > <![CDATA[5×10 6 > Grain size (μm) 0.71 3.8 Oxide film resistance (mΩ) 8.2 15.6

[0120] The comparative analysis of the experimental data in Table 1 is as follows:

[0121] 1. Conductivity: The conductivity of the moving contact material in Example 1 is 8.8 × 10 5 S / m, significantly higher than 7.2 × 10 5 S / m of the traditional AgSnO2 material. The conductivity is increased by 22.2%, indicating that the current transmission efficiency of Example 1 is higher and the energy loss is lower, meeting the high conductivity requirements of the dual-channel magnetic latching relay of the present invention.

[0122] 2. Anti-welding force: The anti-welding force of the moving contact material in Example 1 is 68.2 N, far exceeding 38.1 N of the traditional AgSnO2 material, with an increase of 79%. This improvement significantly reduces the risk of contact welding under high current or high temperature, enhancing the safety and reliability of the dual-channel magnetic latching relay of the present invention.

[0123] 3. Service life: The service life of the moving contact material in Example 1 is 1.8×10 7 times, which is 3.6 times that of the traditional AgSnO2 material (5×10 6 times). The significant extension of the service life can greatly reduce the replacement frequency and maintenance cost of the dual-channel magnetic latching relay of the present invention.

[0124] 4. Grain size: The grain size of the moving contact material in Example 1 is 0.71 μm, which is much smaller than 3.8 μm of the traditional AgSnO2 material. The finer grain structure of the moving contact material of the present invention improves the densification and mechanical strength of the material, helps to enhance the wear resistance and arc erosion resistance, and may inhibit the formation of oxide films at the same time.

[0125] 5. Oxide film resistance: The oxide film resistance of the moving contact material in Example 1 is 8.2 mΩ, which is only 52.6% of the AgSnO2 material (15.6 mΩ). The low oxide film resistance indicates that the surface of the material is more stable, the contact resistance fluctuates little, and excellent electrical conductivity can be maintained for a long time.

[0126] Conclusion: The moving contact material in Example 1 is significantly superior to the traditional AgSnO2 material in all key performance indicators, especially achieving a breakthrough improvement in the anti-welding force, service life and conductivity. The optimization of this comprehensive performance indicates that the material in Example 1 has higher reliability, durability and efficiency, meets the requirements for high-performance contact materials in the application of the dual-channel magnetic latching relay of the present invention, and reflects significant technological progress.

[0127] It should be noted that although the embodiments described above of the present invention are illustrative, they are not limitations of the present invention. Therefore, the present invention is not limited to the above specific embodiments. Without departing from the principle of the present invention, any other embodiments obtained by those skilled in the art under the inspiration of the present invention are regarded as within the protection scope of the present invention.

Claims

1. A highly reliable dual-channel magnetic latching relay, characterized in that, It includes three major parts, namely the control circuit part, the housing part, the magnetic circuit system and the push rod part. The control circuit part consists of two sets of control circuits. The two sets of control circuits are designed with control circuit lead-out pins, namely the first pin, the second pin, the third pin and the fourth pin. The first pin extends from the outside of the front lower part of the second and third pins to between the third and fourth pins. The riveting contact point of the first pin and the upper reed combination of the fourth pin form a circuit group. The second pin and the third pin form another circuit. The first pin consists of a static contact and a static reed seat, and they are connected to each other by a riveting process. The outer shape of the first pin is L-shaped. There is a device cavity protruding from the front lower part of the dual-channel magnetic latching relay. The cavity is wrapped by a plastic body all around. After the lower cover is closed, it is completely separated from the outside, improving the insulation performance with each conductor and enhancing the sealing performance, avoiding the influence of dust, foreign objects and air humidity on the dual-channel magnetic latching relay.

2. The highly reliable dual-channel magnetic latching relay according to claim 1, wherein Each set of control circuits in the dual-channel control circuit part consists of a moving reed seat, a moving reed, a moving contact, a static reed seat and a static contact.

3. The highly reliable dual-channel magnetic latching relay according to claim 2, characterized in that, The moving contact, the static contact, the moving reed, the static reed seat and the moving reed seat are all connected to each other by a riveting process. The moving contact is made of moving contact material, and the static contact is made of static contact material.

4. The highly reliable dual-channel magnetic latching relay according to claim 3, characterized in that There are 2 designed moving reed seats, namely the moving reed seat of the third pin and the moving reed seat of the fourth pin. The static reed seat of the first pin is connected to the moving reed seat of the fourth pin to form a control circuit. The static reed seat of the second pin is connected to the moving reed seat of the third pin to form a control circuit.

5. The highly reliable dual-channel magnetic latching relay according to claim 3, characterized in that, There are 2 designed groups of moving reeds, and each group consists of 3 pieces used overlapping.

6. The highly reliable dual-channel magnetic latching relay according to claim 3, wherein There are 2 designed static reed seats, namely the static reed seat of the first pin and the static reed seat of the second pin. The static reed seat of the first pin is connected to the fourth moving reed seat to form a control circuit. The static reed seat of the second pin is connected to the moving reed seat of the third pin to form a control circuit.

7. The highly reliable dual-channel magnetic latching relay according to claim 1, characterized in that, The housing part consists of an outer shell, an upper cover and a lower cover.

8. The highly reliable dual-channel magnetic latching relay according to claim 1, wherein The magnetic circuit system and the push rod part consist of a coil combination, a bracket, a magnet combination and a push rod.

9. The highly reliable dual-channel magnetic latching relay according to claim 8, wherein The coil combination includes a bobbin, enameled wire, lead pins, an iron core and a yoke.

10. The highly reliable dual-channel magnetic latching relay according to claim 1, wherein, The push rod is designed with 3 slots for connecting the magnet combination and 2 moving reeds.

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