High-performance two-way magnetic latching relay with symmetrically distributed input and output

Abstract

The utility model discloses a high-performance two-way magnetic latching relay with symmetrically distributed input and output, which structurally comprises three parts: a shell part, a control group loop part and a magnetic circuit system part, and the shell part consists of a shell, an upper cover and a lower cover; the control group loop branch comprises an L1 control group loop and an L2 control group loop. Each control group loop is composed of a movable contact, a movable reed, a movable reed seat, a static contact and a static reed seat. The magnetic circuit system part comprises a coil frame, an enameled wire, an iron core, a yoke, a support, a pushing piece and a magnetic steel assembly. According to the utility model, the problem of poor short-circuit impact resistance of the magnetic latching relay with symmetrically distributed input and output can be solved.

Description

Technical Field

[0001] This utility model belongs to the field of relay equipment technology, specifically relating to a high-performance dual-channel magnetic latching relay with symmetrically distributed input and output. Background Technology

[0002] With the widespread application of a series of advanced technologies and the continuous improvement of infrastructure, smart grids have permeated all aspects of people's lives, bringing about many changes in the field of electricity consumption. The most significant improvement is the continuous enhancement of the safety and reliability of electricity meters during use, which not only ensures the stability of residential electricity consumption but also provides a solid foundation for many electricity consumption scenarios such as industrial production.

[0003] Inside the smart meter, a crucial electricity metering device, lies a vital component—the magnetic latching relay. It plays a crucial role, much like a "commander at a transportation hub," being a key link in achieving precise and efficient circuit switching. Its performance directly affects the stable operation of the entire smart meter. Therefore, the magnetic latching relay must possess exceptional qualities, especially excellent short-circuit current withstand capability, to cope with unexpected situations that may arise in complex and ever-changing electrical environments, such as instantaneous current overloads and short-circuit faults, thereby effectively ensuring the safety and smooth operation of the power system.

[0004] The currently common symmetrical magnetic latching relays are designed to meet the requirement of symmetrical structural layout, thereby achieving standardized production, convenient assembly, and simplified maintenance. Specifically, the stationary spring seat of the L1 control group starts from the rear of the relay, follows a specific path around the L1 control group and the magnetic system, and precisely lands on the left side of the moving spring seat of the L2 control group. From an aesthetic and assembly process perspective, this layout does indeed achieve the symmetrical architecture desired in the initial design, which is beneficial for process control in large-scale production operations.

[0005] However, a deeper analysis of the product's internal electromagnetic principles and operating mechanisms revealed that, because the static spring seat of the L2 control group surrounds the entire magnetic circuit system, a magnetic field is generated around a current-carrying conductor according to basic electromagnetic principles. This arrangement causes multiple magnetic fields to superimpose and interfere with each other within a limited space. This complex and disordered magnetic field distribution significantly disrupts the original magnetic flux path stability of the magnetic circuit system, leading to fluctuations in permeability and a significant increase in magnetic reluctance. Consequently, when encountering a short-circuit current surge, the electromagnetic driving force inside the relay cannot respond as ideally, resulting in frequent problems such as delayed armature action and poor contact. Ultimately, this severely impairs its short-circuit surge resistance performance, making it difficult to meet stringent short-circuit surge test standards such as UC2 and UC3, posing a serious challenge to the high-reliability operation of smart meters. Utility Model Content

[0006] This invention provides a high-performance dual-channel magnetic latching relay with symmetrically distributed input and output, which solves the problem of short-circuit impact difference in magnetic latching relays and can also effectively reduce the size of the relay.

[0007] To achieve the above technical objectives, the design scheme of this utility model is as follows:

[0008] A high-performance dual-channel magnetic latching relay with symmetrically distributed input and output comprises three main parts: a housing part, a control circuit part, and a magnetic circuit system part. The housing part consists of an outer shell, an upper cover, and a lower cover, with the outer shell disposed between the upper cover and the lower cover.

[0009] The control group circuit includes L1 control group circuit and L2 control group circuit. Each control group circuit consists of a moving contact, a moving spring seat, a moving spring, a stationary spring contact, and a stationary spring seat. The stationary contact is placed on the stationary spring seat, the moving spring contact is placed on the moving spring, and the moving spring is assembled on the moving spring seat.

[0010] The magnetic circuit system includes a coil frame, a support, a push plate, a magnet assembly, enameled wire, an iron core, and a yoke. The yoke is located on both sides of the coil frame, with the iron core inserted in the middle. The magnet assembly is located between the two yokes. The support is placed on the magnet assembly. Enameled wire is wound on the coil frame. The push plate is designed with slots to be inserted into the magnet assembly and connected to the moving spring in each control group of the control group circuit.

[0011] Furthermore, the interior of the outer shell is designed with slots and cavities for positioning various components.

[0012] Furthermore, the stationary spring seat of the L1 control group and the moving spring seat of the L1 control group form the L1 control group, and the stationary spring seat of the L2 control group and the moving spring seat of the L2 control group form the L2 control group. The stationary spring seat of the L2 control group extends horizontally from the front end below the stationary contact and the moving contact of the L1 control group to the left side of the moving spring seat of the L2 control group, forming a circuit.

[0013] Furthermore, the central circle of the stationary spring seat of the L2 control group adopts a segmented welding process, which is to weld two parts together into one piece.

[0014] Furthermore, each control group has 3 moving reeds.

[0015] Furthermore, two of the moving springs are made of copper sheets, with a U-shaped design on the right side, and one of them has a bent head; the remaining moving springs are made of beryllium copper.

[0016] Furthermore, the magnet assembly includes two armature plates, a permanent magnet block, and a plastic body. The process is as follows: the two armature plates and the permanent magnet block are installed in the injection mold fixture, and then the injection molding process begins. After the injection is complete, the plastic body encapsulates the two armature plates and the permanent magnet block to form an integral unit.

[0017] Furthermore, the two armature plates are made of DT4E material, the permanent magnet block is made of neodymium iron boron material, and the plastic body is made of wear-resistant PBT material.

[0018] Furthermore, the coil assembly consists of a coil subframe, enameled wire, iron core, and yoke. The iron core and yoke are made of DT4E material. The enameled wire has a pure copper core and is wrapped with an insulating varnish. The coil subframe is made of wear-resistant PBT material. The iron core and yoke are fixed together by riveting.

[0019] Furthermore, there are two yokes.

[0020] Compared with the prior art, the present invention has the following technical advantages:

[0021] 1. Structural advantages: It adopts a unique shell design, with slots and cavities inside the shell to position each component, providing accurate installation positions and stable support structures for each component, ensuring accurate relative positions between components, and effectively avoiding the impact of component displacement on relay performance during operation. It has higher stability compared to existing technologies.

[0022] 2. Dual-path control advantage: The control group circuit is innovatively composed of L1 control group circuit and L2 control group circuit. The unique circuit connection method enables the relay to realize dual-path control function, which can meet more complex circuit requirements. This is something that existing technologies do not have.

[0023] 3. Advantages of the moving reed design: The moving reeds of each control group are carefully designed. Two of them are made of copper sheets and the middle right part is U-shaped, which reduces working stress and extends service life and stability. There is also a beryllium copper moving reed with a bent head design, which plays a buffering role when the contact point is in contact. Combined with the double contact design, it greatly improves the reliability and stability of the circuit connection, which is superior to the single moving reed design of the existing technology.

[0024] 4. Advantages in Magnetic Circuit System Assembly and Materials: The magnetic circuit system uses a riveting process to connect the yoke, iron core, and coil frame into one unit, ensuring good magnetic conductivity. The magnet components are made of DT4E material armature sheets, neodymium iron boron permanent magnet blocks, and wear-resistant PBT plastic bodies, molded through a specific injection molding process, ensuring that the magnet components have both good magnetic and mechanical properties, which is a significant improvement in magnetic circuit performance and durability compared to existing technologies.

[0025] 5. Advantages in resisting short-circuit impacts: The stationary spring seat of the L2 control group extends from below the moving and stationary contacts of the L1 control group to the left side of the L1 control group. At this time, the section of the stationary spring seat spanned by the L2 control group is perpendicular to the electromagnetic field of the magnetic circuit system. This reduces the interference of the magnetic field generated by the stationary spring seat of the L2 control group on the magnetic circuit system when the magnetic latching relay is subjected to a short-circuit impact. It avoids the failure of the magnetic circuit system causing the moving contact to bounce and thus leading to short-circuit impact failure. This solves the problem of poor resistance to short-circuit impacts of existing symmetrical distributed magnetic latching relays with input and output, and greatly improves the ability to work stably in complex circuit environments. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the appearance of the high-performance dual-channel magnetic latching relay with symmetrically distributed input and output of this utility model;

[0027] Figure 2 This is a schematic diagram of the main structure of the high-performance dual-channel magnetic latching relay with symmetrically distributed input and output of this utility model;

[0028] Figure 3 This is a front view of the magnet assembly of this utility model;

[0029] Figure 4 This is a cross-sectional view of the magnet assembly of this utility model;

[0030] Figure 5 This is a front view of the coil assembly of this utility model;

[0031] Figure 6 This is a cross-sectional view of the coil assembly of this utility model;

[0032] Figure 7 This is a schematic diagram of the moving spring structure of each control group of this utility model;

[0033] Figure 8 This is a schematic diagram of the contact design of this utility model. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to specific embodiments and the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present invention.

[0035] like Figure 1 , 2As shown, a high-performance dual-channel magnetic latching relay with symmetrically distributed input and output comprises three main parts: a housing, a control circuit, and a magnetic circuit system. The housing consists of an outer shell 11, an upper cover 12, and a lower cover 13, with the outer shell 11 positioned between the upper cover 12 and the lower cover 13. The housing interior is designed with slots and cavities for positioning various components. The control circuit includes an L1 control circuit and an L2 control circuit. Each control circuit consists of a moving contact, a moving spring seat, a moving spring, and a stationary contact. The system consists of contacts and stationary spring seats; 21 is the stationary spring seat of the L1 control group, 22 is the stationary spring seat of the L2 control group, 23 is the stationary spring and moving contact of the two control groups, with the stationary contact on the left and the moving contact on the right; 24 is the moving spring seat of the L1 control group, 25 is the moving spring seat of the L2 control group, and 26 is the moving spring of each control group, with a total of 3 springs. The stationary contact is placed on the stationary spring seat, the moving contact is placed on the moving spring, and the moving springs are assembled on the moving spring seat. The three components are fixed together by riveting to form an assembly.

[0036] The stationary spring seat 21 and the moving spring seat 24 of the L1 control group form the L1 control group. The stationary spring seat 22 of the L2 control group forms a control group loop from the right side of the magnetic circuit system. The stationary spring seat 22 and the moving spring seat 25 of the L2 control group form the L2 control group. The stationary spring seat 22 of the L2 control group extends horizontally from below the stationary spring point and moving contact of the L1 control group to the left side of the moving spring seat 24 of the L1 control group, forming a loop.

[0037] The magnetic circuit system includes a coil frame 30, a bracket 27, a pusher plate 32, a magnet assembly 28, enameled wire 33, an iron core 29, and a yoke 31. There are two yokes 31, one on each side of the coil frame 30, with the iron core 29 inserted in the middle. The yokes 31, the iron core 29, and the coil frame 30 are riveted together. The magnet assembly 28 is placed between the two yokes 31. The bracket 27 is placed on the magnet assembly 28 and designed with protruding nails to fix it to the outer shell. The coil frame 30 is wound with enameled wire 33. The pusher plate 32 is designed with slots to engage with the levers of the magnet assembly and the moving springs in each control group of the control group circuit. Combined with the reasonable layout design of the outer shell and the slot limit, they move synchronously. The open and closed states of the contacts are maintained by the magnetic force generated by the permanent magnet. Only a positive (reverse) DC pulse voltage is needed to excite the coil, and the relay completes the open and closed state transition instantaneously. Normally, when the contacts are in the holding state, the coil does not need to be energized, and the state of the relay can be maintained by the magnetic force of the permanent magnet alone.

[0038] like Figure 3 , 4As shown, the magnet assembly 28 includes two armature plates 281, a permanent magnet 282, and a plastic body 283, which are manufactured using a special process. The two armature plates 281 and the permanent magnet 282 are installed in the positioning fixture of the injection mold, and then the injection molding process begins. After the injection is full, the plastic body 283 encloses the two armature plates 281 and the permanent magnet 282 to form an integral unit, which is called the magnet assembly. The two armature plates 281 are made of DT4E material, the permanent magnet 282 is made of neodymium iron boron material, and the plastic body 283 is made of wear-resistant PBT material.

[0039] like Figure 5 , 6 As shown, the coil assembly consists of a coil frame 30, enameled wire 33, iron core 29, and yoke 31. Iron core 29 and yoke 31 are made of DT4E material. The enameled wire 33 has a pure copper core and is wrapped with an insulating varnish. The coil frame 30 is made of relatively wear-resistant PBT material. Iron core 29 and yoke 31 are fixed together by riveting, which has a better magnetic conductivity.

[0040] like Figure 7 , 8 As shown, each control group's moving spring 26 consists of three overlapping pieces used simultaneously. The first moving spring 261 and the second moving spring 262 are made of copper sheets with good conductivity, and the middle right part is designed with a U-shape. This design effectively reduces the stress on the moving spring. The third moving spring 263 is made of elastic beryllium copper material, and the head has a bending design to provide a buffering effect when the contact point makes contact. This design can increase the product's lifespan. The contact 23 adopts a double contact design.

[0041] The principle of this utility model's high-performance dual-channel magnetic latching relay technology with symmetrically distributed input and output is as follows:

[0042] I. Overall Structure Overview

[0043] The dual-channel magnetic latching relay of this invention mainly consists of a housing, a control circuit, and a magnetic circuit system. This structural design not only achieves symmetrical distribution of input and output but also has significant advantages in improving resistance to short-circuit impacts.

[0044] II. Structure and Functional Principles of Each Part

[0045] (a) Shell portion

[0046] The housing consists of an outer shell, an upper cover, and a lower cover, with the outer shell located between the upper and lower covers. The interior of the outer shell is designed with slots and cavities to position the various components. This design provides accurate mounting positions and a stable support structure for each component of the relay, ensuring precise relative positioning and preventing component displacement from affecting relay performance during operation.

[0047] (ii) Control group loop section

[0048] The basic composition and connection method of the control group circuit includes the L1 control group circuit and the L2 control group circuit. Each control group circuit consists of a moving contact, a moving spring seat, a moving spring, a stationary contact, and a stationary spring seat. The stationary contact is placed on the stationary spring seat, the moving contact is placed on the moving spring, and the moving spring is placed on the moving spring seat. The three are fixed together by riveting to form a unit. Circuit formation principle: The stationary spring seat and the moving spring seat of the L1 control group form the L1 control group; the stationary spring seat and the moving spring seat of the L2 control group form the L2 control group. The stationary spring seat of the L2 control group extends horizontally from the front end below the stationary and moving contacts of the L1 control group to the left side of the moving spring seat of the L2 control group, forming a complete circuit. This unique circuit design allows the relay to achieve dual-channel control function and lays the foundation for improving short-circuit impact resistance. Moving spring design principle: Each control group has 3 moving springs. Two of the springs are made of copper, with a U-shaped design on the right side. This design effectively reduces stress on the moving spring during operation, improving its lifespan and stability. One spring has a bent head design, while the remaining spring is made of beryllium copper. The bent head design of this spring provides cushioning during contact, further extending the product's lifespan. Simultaneously, the double-contact design enhances the reliability and stability of the circuit connection.

[0049] (III) Magnetic Circuit System

[0050] 1. Basic Components and Assembly Structure

[0051] The magnetic circuit system includes a coil frame, a support, a pusher plate, a magnet assembly, enameled wire, an iron core, and yokes. There are two yokes, one on each side of the coil frame, with the iron core inserted between them. The yokes, iron core, and coil frame are riveted together, a riveting process that ensures good magnetic conductivity. The magnet assembly is positioned between the two yokes, and the support is placed on the magnet assembly with protruding pins that secure it to the outer shell, ensuring the stability of the magnet assembly. Enameled wire is wound around the coil frame; the core of the wire is pure copper, and the outside is coated with an insulating varnish, ensuring both good conductivity and insulation.

[0052] 2. Manufacturing principle of magnet components

[0053] The magnet assembly comprises two armature plates, a permanent magnet block, and a plastic body. The two armature plates and the permanent magnet block are installed in an injection mold fixture, and an injection molding process is performed. After full injection, the plastic body encapsulates the two armature plates and the permanent magnet block, forming a single unit. The two armature plates are made of DT4E material, the permanent magnet block is made of neodymium iron boron material, and the plastic body is made of wear-resistant PBT material. This manufacturing process and material selection ensure that the magnet assembly possesses excellent magnetic and mechanical properties.

[0054] 3. Working principle of the magnetic circuit system

[0055] The magnetic circuit system is connected to an external power source via enameled wire wound on the coil frame. When a positive (or negative) DC pulse voltage is applied to excite the coil, the coil generates a magnetic field. This magnetic field interacts with the magnetic field generated by the magnet assembly, causing the magnet assembly to move. The movement of the magnet assembly is transmitted to a moving spring in the control circuit via a push plate. The moving spring drives the moving contact, thereby switching the open and closed states of the relay contacts. When the contacts are in the holding state, due to the magnetic force generated by the permanent magnet, the relay state remains unchanged even when the coil is no longer energized, achieving the magnetic holding function.

[0056] III. Short-circuit impact resistance principle

[0057] Under short-circuit impact, the stationary spring seat of the L2 control group generates a magnetic field. Since the stationary spring seat of the L2 control group spans from below the moving and stationary contacts of the L1 control group to the left side of the L1 control group, this section of the stationary spring seat spanned by the L2 control group is perpendicular to the electromagnetic field of the magnetic circuit system. According to electromagnetic principles, when two magnetic fields are perpendicular, their mutual interference is greatly reduced. Therefore, this structural design reduces the interference of the magnetic field generated by the stationary spring seat of the L2 control group on the magnetic circuit system during short-circuit impact, avoiding moving contact bounce caused by magnetic circuit system failure, thus effectively preventing short-circuit impact failure and solving the problem of poor short-circuit impact resistance in existing symmetrically distributed magnetic latching relays. In summary, this utility model's high-performance dual-channel magnetic latching relay with symmetrically distributed input and output achieves stable and reliable dual-channel control function and excellent short-circuit impact resistance through reasonable structural design and ingenious application of electromagnetic principles.

[0058] IV. Working Principle:

[0059] During operation, the relay can instantly switch between open and closed states by simply exciting the coil with a positive (or negative) DC pulse voltage. This is because when a pulse voltage is applied, the coil generates a magnetic field, which interacts with the magnetic field of the magnet assembly, driving the actuator to move, which in turn moves the reed, thus opening and closing the contacts. Normally, when the contacts are in the holding state, the coil does not need to be continuously energized; the magnetic force of the permanent magnet is sufficient to maintain the relay's state.

[0060] Of particular note is that, when facing short-circuit impacts, the stationary spring seat of the L2 control group extends from below the moving and stationary contacts of the L1 control group to the left side of the L1 control group. This spanning stationary spring seat is perpendicular to the electromagnetic field of the magnetic circuit system. This reduces the interference of the magnetic field generated by the stationary spring seat of the L2 control group on the magnetic circuit system when the magnetic latching relay experiences a short-circuit impact. It also prevents the moving contact from bouncing due to magnetic circuit system failure, which could lead to short-circuit impact failure. This effectively solves the problem of poor resistance to short-circuit impacts in existing symmetrical distributed magnetic latching relays with input and output, and greatly improves the relay's ability to work stably in complex circuit environments.

[0061] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A high-performance dual-channel magnetic latching relay with symmetrically distributed input and output, comprising three main parts: a housing, a control circuit, and a magnetic circuit system, characterized in that... The housing consists of an outer shell, an upper cover, and a lower cover, with the outer shell disposed between the upper cover and the lower cover; The control group circuit includes L1 control group circuit and L2 control group circuit. Each control group circuit consists of a moving contact, a moving spring, a moving spring seat, a stationary contact, and a stationary spring seat. The stationary contact is placed on the stationary spring seat, the moving contact is placed on the moving spring, and the moving spring is assembled on the moving spring seat. The magnetic circuit system includes a coil frame, enameled wire, iron core, yoke, support, push plate, and magnet assembly. The yoke is located on both sides of the coil with the iron core inserted in the middle. The magnet assembly is located between the two yokes. The support is placed on the magnet assembly. Enameled wire is wound on the coil frame. The push plate is designed with slots to be inserted into the magnet assembly and connected to the moving spring in each control group of the control group circuit.

2. The high-performance dual-channel magnetic latching relay with symmetrically distributed input and output as described in claim 1, characterized in that, The interior of the outer shell is designed with slots and cavities for positioning various components.

3. The high-performance dual-channel magnetic latching relay with symmetrically distributed input and output as described in claim 1, characterized in that, The stationary spring seat and the moving spring seat of the L1 control group form the L1 control group, which is located on the right side of the magnetic circuit section. The stationary spring seat and the moving spring seat of the L2 control group form the L2 control group. The stationary spring seat of the L2 control group extends from below the stationary and moving contacts of the L1 control group to the left side of the moving spring seat of the L2 control group, forming a control group circuit group.

4. The high-performance dual-channel magnetic latching relay with symmetrically distributed input and output as described in claim 3, characterized in that, Each control group has 3 reeds.

5. The high-performance dual-channel magnetic latching relay with symmetrically distributed input and output as described in claim 1, characterized in that, The coil frame of the magnetic circuit system is arranged vertically and parallel to the moving spring seat.

6. The high-performance dual-channel magnetic latching relay with symmetrically distributed input and output as described in claim 5, characterized in that, Two of the moving springs are made of copper sheets, with a U-shaped design on the right side; the remaining moving springs are made of beryllium copper, with a bent head design.

7. The high-performance dual-channel magnetic latching relay with symmetrically distributed input and output as described in claim 1, characterized in that, The magnet assembly includes two armature plates, a permanent magnet block, and a plastic body. The manufacturing process is as follows: the two armature plates and the permanent magnet block are installed in the positioning fixture of the injection mold, and then the injection molding process begins. After the injection is complete, the plastic body encapsulates the two armature plates and the permanent magnet block to form an integral unit.

8. The high-performance dual-channel magnetic latching relay with symmetrically distributed input and output as described in claim 1, characterized in that, The two armature plates are made of DT4E material, the permanent magnet block is made of neodymium iron boron material, and the plastic body is made of wear-resistant PBT material.

9. The high-performance dual-channel magnetic latching relay with symmetrically distributed input and output as described in claim 1, characterized in that, The coil assembly consists of a coil frame, enameled wire, iron core, and yoke. The iron core and yoke are made of DT4E material. The enameled wire has a pure copper core and is wrapped with an insulating varnish. The coil frame is made of wear-resistant PBT material. The iron core and yoke are fixed together by riveting.

10. A high-performance dual-channel magnetic latching relay with symmetrically distributed input and output as described in claim 9, characterized in that, There are two yokes.

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