Large-current-resistant magnetic latching relay

Abstract

A large-current-resistant magnetic latching relay comprises a shell, a coil assembly, a magnetic steel assembly, a transmission assembly, a movable spring assembly, a static spring assembly and an arc extinguishing assembly. The coil assembly comprises a coil framework and a coil. The magnetic steel assembly comprises a permanent magnet and a swing arm. The transmission assembly comprises a connecting rod, a sleeving end, an abutting end and a T-shaped head. The movable spring assembly comprises a movable contact piece, a movable spring piece, a connecting plate, a groove-shaped buckle plate, a movable contact and a magnetic block. The static spring assembly comprises a static reed and a static contact. The thickness of the moving contact can be independently increased during production, and the production cost is reduced. And the end part of the movable reed is provided with a slot, so that the contact consistency between the two movable contacts and the static contact is ensured. The groove-shaped buckle plate is arranged on the connecting plate, the magnetic block is arranged on the side wall of the base, the magnetic block and the groove-shaped buckle plate attract each other, repulsive force generated when the contacts make contact is counteracted, and a better arc repulsive resistance effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of magnetic latching relay technology, and in particular to a magnetic latching relay resistant to high current. Background Technology

[0002] Magnetic latching relays are a new type of relay developed in recent years, serving as an automatic switch. Traditional electromagnetic relays only automatically connect and disconnect circuits, while the normally open or normally closed state of a magnetic latching relay relies entirely on the action of a permanent magnet. Its switching state transition is triggered by a pulse electrical signal of a certain width. Furthermore, the coil does not need to be continuously energized; the magnetic force of the permanent magnet is sufficient to maintain the relay's state. Magnetic latching relays are widely used in power systems and are a highly reliable, high-power switching, energy-saving, and environmentally friendly green component.

[0003] In existing magnetic latching relays, the moving contact and moving spring are often integrally molded for direct assembly into the base. This results in the moving contact and moving spring having the same thickness. Limited by internal space constraints and the elasticity of the moving spring, the thickness of the moving contact cannot be increased, thus limiting its ability to withstand larger currents. It should be noted that if the moving spring's elasticity is too great, a large pulling or pushing force is required to actuate it, which the relay coil cannot provide. Furthermore, even if there is sufficient internal space, the increased overall thickness of the moving contact and moving spring leads to increased costs. Additionally, the moving contact itself has inherent deviations, preventing fine adjustments and ensuring contact consistency. As the current increases, a greater repulsive force is generated between the contacts during engagement, a problem that existing relays cannot completely overcome.

[0004] CN201320235629.5 discloses a magnetic latching relay, including a base, a magnetic system, and a conductive circuit. The base has a magnetic system slot, a moving electrode slot, a stationary electrode slot, and a through hole. The magnetic system includes a coil, a magnetic converter, and a power transmission rod. The conductive circuit includes a spoon-shaped stationary electrode, contacts, and an inverted L-shaped moving electrode. This invention proposes a magnetic latching relay that solves the adverse effects of large current surges on relay switching, greatly increasing the relay contact load capacity and surge current resistance. By using a dedicated cantilever spring to separate the conductivity and elasticity of the relay's moving electrode, it is beneficial to improve the relay's electrical performance, reduce material costs, and increase the consistency of mass production of relays, but it cannot completely solve the aforementioned problems. Summary of the Invention

[0005] In view of this, the present invention provides a magnetic latching relay that can withstand high current, which increases the thickness of the moving contact to allow a larger current to pass through without increasing the elasticity of the moving spring, thereby solving the above-mentioned technical problems.

[0006] A high-current-resistant magnetic latching relay includes a housing, a coil assembly disposed within the housing, a magnet assembly disposed on one side of the coil assembly, a transmission assembly movably disposed within the housing, a moving spring assembly disposed within the housing, a stationary spring assembly fixedly disposed on one side wall of the housing, and an arc-extinguishing assembly disposed on one side of the stationary spring assembly. The coil assembly includes a coil frame fixedly disposed in a coil mounting portion, and a coil wound around the coil frame. The magnet assembly includes a permanent magnet rotatably disposed in the magnet mounting portion, and a swing arm disposed on the end face of the permanent magnet facing away from the coil assembly. The transmission assembly includes a connecting rod, a sleeve end disposed at one end of the connecting rod, an abutment end disposed at the other end of the connecting rod, and a T-shaped head disposed on one side of the abutment end. The moving spring assembly includes a moving contact piece fixedly mounted on the side wall of the base, a moving spring piece connected at one end to the moving contact piece, two connecting plates spaced apart at the other ends of the moving spring pieces, two slotted fasteners respectively fastened to the middle regions of the connecting plates, two moving contacts respectively located at the other ends of the connecting plates, and a magnetic block located on the side wall of the base corresponding to the slotted fasteners. The moving spring piece is composed of multiple metal spring pieces, with a release groove in its middle region, and a slot in the middle region of the end of the metal spring piece connected to the connecting plate. The stationary spring assembly includes a stationary spring piece fixedly mounted in the stationary spring groove, and a stationary contact located at the end of the stationary spring piece corresponding to the moving contact. The arc-extinguishing assembly consists of multiple arc-extinguishing plates, and the placement of the multiple arc-extinguishing plates covers the movement range of the moving contact.

[0007] Furthermore, the housing includes a base and a top cover disposed on the base.

[0008] Furthermore, the base includes a coil mounting portion, a magnet mounting portion disposed on one side of the coil mounting portion, a moving spring receiving portion disposed on one side of the coil mounting portion, a plurality of stationary spring grooves disposed on adjacent end faces of the moving spring receiving portion, and an arc extinguishing groove disposed on one side of the stationary spring groove.

[0009] Furthermore, the sleeve end is sleeved and fixed to the free end of the swing arm.

[0010] Furthermore, one end of the movable contact extends to the outside of the base, and the other end is fixedly connected to the movable spring by a rivet.

[0011] Furthermore, the two connecting plates are located on both sides of the T-shaped head.

[0012] Furthermore, the number of stationary contacts corresponds to the number of moving contacts.

[0013] Furthermore, the position of the magnetic block corresponds to that of the slotted buckle plate.

[0014] Compared with existing technologies, this utility model provides a high-current-resistant magnetic latching relay by separating the moving contact and the moving spring into independent units and connecting them by riveting. This allows for individual increases in the thickness of the moving contact during production, reducing manufacturing costs. A slot is provided at the end of the moving spring, enabling independent adjustment of the angles of the two connecting plates during installation, thus ensuring consistent contact between the two moving contacts and the stationary contact. A slotted retaining plate is provided on the connecting plate, and a magnetic block is provided on the side wall of the base corresponding to the slotted retaining plate. The magnetic block attracts the slotted retaining plate, counteracting the repulsive force during contact and providing better anti-arc repulsion. An arc-extinguishing component is provided on one side of the moving contact's movement path to eliminate arcs and improve the relay's stability during use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a magnetic latching relay that can withstand high current provided by this utility model.

[0016] Figure 2 for Figure 1 A schematic diagram of the internal structure of a high-current magnetic latching relay.

[0017] Figure 3 for Figure 2 A schematic diagram of the base structure of a high-current magnetic latching relay.

[0018] Figure 4 for Figure 2 A schematic diagram of the transmission components of a high-current magnetic latching relay.

[0019] Figure 5 for Figure 2 A schematic diagram of the moving spring assembly in a high-current magnetic latching relay.

[0020] Figure 6 for Figure 4 A schematic diagram of the structure of the moving spring assembly. Detailed Implementation

[0021] The specific embodiments of this utility model are described in further detail below. It should be understood that the description of the embodiments of this utility model herein is not intended to limit the scope of protection of this utility model.

[0022] like Figures 1 to 6 The diagram shows a structural schematic of a high-current-resistant magnetic latching relay provided by this utility model. The high-current-resistant magnetic latching relay includes a housing 10, a coil assembly 20 disposed within the housing 10, a magnet assembly 30 disposed on one side of the coil assembly 20, a transmission assembly 40 movably disposed within the housing 10, a moving spring assembly 50 disposed within the housing 10, a stationary spring assembly 60 fixedly disposed on one side wall of the housing 10, and an arc-extinguishing assembly 70 disposed on one side of the stationary spring assembly 60. It is conceivable that the high-current-resistant magnetic latching relay also includes other functional structures, such as terminals, covers, etc., which are well-known to those skilled in the art and will not be described in detail here.

[0023] The outer casing 10 includes a base 11 and a top cover 12 covering the base 11. The base 11 includes a coil mounting portion 111, a magnet mounting portion 112 disposed on one side of the coil mounting portion 111, a moving spring receiving portion 113 disposed on one side of the coil mounting portion 111, a plurality of stationary spring grooves 114 disposed on adjacent end faces of the moving spring receiving portion 113, and an arc extinguishing groove 115 disposed on one side of the stationary spring groove 114.

[0024] The coil mounting portion 111 is used to mount the coil assembly 20, the magnet mounting portion 112 is used to mount the magnet assembly 30, the moving spring receiving portion 113 is used to mount the moving spring assembly 50, the stationary spring groove 114 is used to mount the stationary spring assembly 60, and the arc-extinguishing bush 115 is used to mount the arc-extinguishing assembly 70. After all the above components are housed in the base 11, the top cover 12 and the base 11 are interlocked to seal them, providing fixation and protection. The above-described functional structure of the outer casing 10 can be designed according to the structure of the specific functional components to be placed, and will not be elaborated further here.

[0025] The coil assembly 20 includes a coil frame 21 fixedly disposed in the coil mounting portion 111, and a coil 22 wound on the coil frame 21. When energized, the coil 22 generates N and S poles at its two ends, respectively, which interact with the magnet assembly 30, thereby driving the magnet assembly 30 to rotate. Furthermore, the coil 22 can change the direction of the current to change the positions of its N and S poles, thereby driving the magnet assembly 30 to oscillate.

[0026] The magnet assembly 30 includes a permanent magnet 31 rotatably disposed in the magnet mounting portion 112, and a swing arm 32 disposed on the end face of the permanent magnet 31 facing away from the coil assembly 20.

[0027] The permanent magnet 31 has N and S poles at its two ends corresponding to the N and S poles of the coil 22, respectively, and these poles are fixed. This allows the permanent magnet 31 to attract or repel the N and S poles at both ends of the coil 22, causing it to swing. The swing arm 32 is integrated with the permanent magnet 31 and therefore swings along with it. The free end of the swing arm 32 is connected to the transmission assembly 40.

[0028] The transmission assembly 40 includes a connecting rod 41, a sleeve end 42 disposed at one end of the connecting rod 41, an abutment end 43 disposed at the other end of the connecting rod 41, and a T-shaped head 44 disposed on one side of the abutment end 43.

[0029] The sleeve end 42 is sleeved and fixed to the free end of the swing arm 32, thereby driving the 41 through the swing arm 32. Please refer to Figure 2 The abutment 43 abuts against the moving spring assembly 50, and the T-shaped head 44 engages with the moving spring assembly 50. The following description will focus on the moving spring assembly 50. The coil assembly 20, magnet assembly 30, and transmission assembly 40 are existing technologies and are not the focus of this invention; therefore, they will not be elaborated upon here.

[0030] The movable spring assembly 50 includes a movable contact piece 51 fixedly disposed on the side wall of the base 11, a movable spring piece 52 connected to the movable contact piece 51 at one end, two connecting plates 53 spaced apart on the other end of the movable spring pieces 52, two slotted buckle plates 54 respectively fastened to the middle area of ​​the connecting plate 53, two movable contacts 55 respectively disposed on the other end of the connecting plate 53, and a magnetic block 56 disposed on the side wall of the base 11 corresponding to the slotted buckle plate 54.

[0031] like Figure 5As shown, one end of the movable contact 51 extends to the outside of the base 11, and the other end is fixedly connected to the movable spring 52 by a rivet. The movable contact 51 and the movable spring 52 are designed separately, so that the thickness of the movable contact 51 can be set to be greater than the total thickness of the movable spring 52, thereby enabling the movable contact 51 to withstand a larger current, and allowing the movable contact 51 and the movable spring 52 to be made of different materials, thereby reducing costs. It is conceivable that the movable spring 52 needs to be kept in a bent state during use, and the free end of the movable spring 52 is driven by the drive assembly 40 connected to the magnet assembly 30, so that the movable contact 55 abuts against the stationary spring assembly 60. As the thickness of the movable spring 52 increases along with that of the movable contact 51, the force required for the movable spring 52 to bend also increases. However, the tension provided by the coil 22 is fixed. If the thickness of the movable spring 52 is too large, it will affect the stability of the relay in the closed or open state, and the tension or push force provided by the coil 22 may not be sufficient to change the circuit state of the relay, such as from closed to open. That is, the elasticity of the movable spring 52 is greater than the maximum tension or push force that the coil 22 can provide, resulting in defective products.

[0032] The movable spring 52 is composed of multiple metal spring pieces 521, with a release groove 522 in its central region to release the stress after bending the metal spring pieces 521, reduce stress concentration, and reduce the area of ​​its bending region so that it can be bent by a smaller force. A partition groove 523 is provided in the central region of the end of the metal spring piece 521 that connects to the connecting plate 53. The partition groove 523 allows the operator to independently adjust the angle of the two connecting plates 53 after they are connected to the movable spring 52, thereby ensuring that the two movable contacts 55 can simultaneously contact the two contacts of the stationary spring assembly 60.

[0033] Please continue reading. Figure 2 The two connecting plates 53 are located on both sides of the T-head 44, so that the T-head 44 can pull the connecting plates 53 to move away from the static spring assembly 60.

[0034] Please see Figure 5 The slotted buckle 54 is fastened to the middle region of the connecting plate 53, corresponding to the position of the magnetic block 56. When the slotted buckle 54 moves toward the magnetic block 56, the magnetic block 56 can attract the slotted buckle 54, improving the anti-arc repulsion force after the moving contact 55 contacts the stationary spring assembly 60.

[0035] The stationary spring assembly 60 includes a stationary spring plate 61 fixedly disposed in the stationary spring groove 114, and a stationary contact 62 disposed on the end of the stationary spring plate 61 corresponding to the moving contact 55. The number of stationary contacts 62 corresponds to the number of moving contacts 55.

[0036] The arc extinguishing assembly 70 is composed of multiple arc extinguishing plates 71, which have their own magnetic field. The placement of the multiple arc extinguishing plates 71 covers the movement range of the moving contact 55, so as to completely eliminate the electric arc between the moving contact 55 and the stationary contact 62.

[0037] In use, the coil 22 is energized, driving the permanent magnet 31 to rotate, causing the abutment 43 to push the moving contact 55 toward the stationary contact 62. Changing the direction of the current in the coil 22 will cause the permanent magnet 31 to pull the connecting rod 41, causing the T-head 44 to pull the two connecting plates 53, thereby separating the moving contact 55 from the stationary contact 62.

[0038] Compared with the prior art, the magnetic latching relay provided by this utility model separates the moving contact 51 and the moving spring 52 into independent units and connects them by riveting. During production, the thickness of the moving contact 51 can be increased individually, making it suitable for high-current applications. A slot is provided at the end of the moving spring 52, allowing independent adjustment of the angles of the two connecting plates 53 during installation, thus ensuring consistent contact between the two moving contacts 55 and the stationary contact 62. A slotted buckle 54 is provided on the connecting plate 53, and a magnetic block 56 is provided on the side wall of the base 11 corresponding to the slotted buckle 54. The magnetic block 56 attracts the slotted buckle 54, counteracting the repulsive force during contact and providing better anti-arc repulsion. An arc-extinguishing component 70 is provided on one side of the moving contact 55's movement path to eliminate arcs and improve the relay's stability during use.

[0039] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions or improvements within the spirit of the present utility model are covered within the scope of the claims of the present utility model.

Claims

1. A magnetic latching relay resistant to high current, characterized in that: The high-current-resistant magnetic latching relay includes a housing, a coil assembly disposed within the housing, a magnet assembly disposed on one side of the coil assembly, a transmission assembly movably disposed within the housing, a moving spring assembly disposed within the housing, a stationary spring assembly fixedly disposed on one side wall of the housing, and an arc-extinguishing assembly disposed on one side of the stationary spring assembly. The housing includes a base, which includes a coil mounting portion, a magnet mounting portion disposed on one side of the coil mounting portion, a moving spring receiving portion disposed on one side of the coil mounting portion, multiple stationary spring slots disposed on adjacent end faces of the moving spring receiving portion, and an arc-extinguishing slot disposed on one side of the stationary spring slot. The coil assembly includes a coil frame fixedly disposed within the coil mounting portion and a coil wound around the coil frame. The magnet assembly includes a permanent magnet rotatably disposed within the magnet mounting portion and a swing arm disposed on the end face of the permanent magnet facing away from the coil assembly. The transmission assembly... The system includes a connecting rod, a sleeve end at one end of the connecting rod, an abutment end at the other end of the connecting rod, and a T-shaped head on one side of the abutment end. The moving spring assembly includes a moving contact plate fixedly mounted on the side wall of the base, a moving spring plate connected at one end to the moving contact plate, two connecting plates spaced apart at the other ends of the moving spring plates, two slotted buckles respectively fastened to the middle area of ​​the connecting plates, two moving contacts respectively mounted on the other ends of the connecting plates, and a magnetic block mounted on the side wall of the base corresponding to the slotted buckles. The moving spring plate is composed of multiple metal spring pieces, with a release groove in its middle area. The middle area of ​​the end of the metal spring piece connected to the connecting plate is also slotted. The stationary spring assembly includes a stationary spring plate fixedly mounted in the stationary spring groove, and a stationary contact mounted on the end of the stationary spring plate corresponding to the moving contact. The arc extinguishing assembly is composed of multiple arc extinguishing plates, and the placement of the multiple arc extinguishing plates covers the movement range of the moving contact.

2. The high-current-resistant magnetic latching relay as described in claim 1, characterized in that: The housing also includes a top cover that is placed on the base.

3. The high-current-resistant magnetic latching relay as described in claim 1, characterized in that: The sleeve end is sleeved and fixed to the free end of the swing arm.

4. The high-current-resistant magnetic latching relay as described in claim 1, characterized in that: One end of the movable contact extends to the outside of the base, and the other end is fixedly connected to the movable spring by a rivet.

5. The high-current-resistant magnetic latching relay as described in claim 1, characterized in that: The two connecting plates are located on both sides of the T-shaped head.

6. The high-current-resistant magnetic latching relay as described in claim 1, characterized in that: The number of stationary contacts corresponds to the number of moving contacts.

7. The high-current-resistant magnetic latching relay as described in claim 1, characterized in that: The position of the magnetic block corresponds to that of the slotted buckle plate.

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