Direct-acting relay with bridge-type double contact structure

Abstract

This utility model relates to a direct-acting relay with a bridge-type double-group contact structure, mainly comprising a housing, an electromagnetic drive assembly, an armature assembly, a stationary contact assembly, and a moving contact assembly. The moving contact assembly adopts a bridge structure, with a first moving contact and a second moving contact at both ends. It is rigidly connected to the armature assembly via a direct-acting frame, achieving synchronous closing or opening of the double moving contacts and the double stationary contacts. This utility model ensures that the first and second moving contacts achieve millimeter-level synchronous displacement under the drive of the armature assembly, enabling synchronous breaking of the two break points. This allows the arc energy to be evenly distributed between the two groups of contacts, reducing contact resistance fluctuations, lowering the single-point arc temperature, and significantly reducing contact material ablation. Furthermore, the rigid connection between the direct-acting frame and the armature assembly eliminates the mechanical clearance of traditional hinge structures, shortens the action response time, and improves the reliability of high-frequency operation.

Description

Technical Field

[0001] This utility model relates to the field of relay technology, specifically to a direct-acting relay with a bridge-type double-group contact structure. Background Technology

[0002] The rotating armature of a relay swings via a pivot or hinge. When the contacts break, the arc energy concentrates at a single point of breakage, resulting in uneven arc distribution, poor arc extinguishing, and a tendency for contact surface oxidation or ablation. This structural defect is particularly pronounced in high-frequency operation scenarios, where fluctuations in contact resistance can lead to abnormal temperature rises or even welding.

[0003] Some improved designs adopted a bridge-type direct-acting moving plate structure, but the problem of insufficient contact synchronization still exists, resulting in uneven arc distribution and affecting the arc extinguishing effect. In addition, there are also defects such as complex connection methods between the bridge rod and the armature (such as multi-stage sleeve connection and split bridge spring), which restricts its action response speed and service life.

[0004] In summary, there is an urgent need for a direct-acting relay that combines high load switching capability, low arc energy, compact structure, and high reliability. Utility Model Content

[0005] To overcome the aforementioned defects of existing relays, this utility model provides a direct-acting relay with a bridge-type double-group contact structure.

[0006] The technical solution adopted in this utility model is as follows: A direct-acting relay with a bridge-type double-group contact structure includes: a housing; an electromagnetic drive assembly installed in the housing for generating electromagnetic force; an armature assembly slidably installed in the housing and reciprocating under the electromagnetic force of the electromagnetic drive assembly; a stationary contact assembly having a first lead-out piece, a second lead-out piece, a first stationary contact disposed on the first lead-out piece, and a second stationary contact disposed on the second lead-out piece; a moving contact assembly including a direct-acting frame, a bridge piece, a first moving contact, and a second moving contact, wherein the first moving contact and the second moving contact are respectively disposed at both ends of the bridge piece, and the middle part of the bridge piece is installed on the direct-acting frame and perpendicular to the sliding direction of the armature assembly; the direct-acting frame is connected to the armature assembly, and as the armature assembly slides, it drives the first moving contact and the second moving contact to synchronously close or synchronously separate from the first stationary contact and the second stationary contact, respectively.

[0007] Preferably, the bridge plate, the first moving contact, and the second moving contact are all in two sets, arranged side by side in the linear motion frame; the first stationary contact and the second stationary contact are also provided in two sets.

[0008] Preferably, the moving contact assembly further includes an arc-shaped spring, the two ends of which are fixed to the two ends of the bridge plate; the direct-moving frame has a frame base plate and two frame side plates, the ends of which are connected to the armature assembly; the bridge plate and the arc-shaped spring are installed together in the space formed by the frame base plate and the frame side plates; the arc-shaped spring contacts the armature assembly and is subjected to force; the bridge plate can slide in a direction perpendicular to the base frame and tends to move closer to the frame base plate under the elastic support of the arc-shaped spring.

[0009] Preferably, a first guide plate is fixed to the side of the frame base plate facing the bridge piece, and the guide plate has a guide hole / notch; a second guide plate is fixed on the bridge piece, and the second guide plate is bent toward the frame base plate to form a guide portion, and the guide portion slides and guides with the guide hole / notch.

[0010] Preferably, it also includes an arc-extinguishing plate installed on the outer casing; the guide portion moves with the moving contact assembly, and its front end remains in contact with or separates from the arc-extinguishing plate.

[0011] Preferably, the armature assembly includes: a sliding housing with a sliding shaft that slides and engages with a slide rail inside the housing; a permanent magnet disposed inside the sliding housing; an outer armature and an inner armature disposed on the sliding housing, both being U-shaped plate structures, with their middle portions respectively in contact with the two magnetic poles of the permanent magnet, and both ends perpendicular to the sliding direction of the sliding housing and bent toward the electromagnetic drive assembly; a first space and a second space, serving as receiving spaces for the ends of the two yoke plates of the electromagnetic drive assembly, respectively formed between the first end of the outer armature and the first end of the inner armature, and between the second end of the outer armature and the second end of the inner armature.

[0012] Preferably, the sliding housing has a slot on the side facing the moving contact component, and a push card is installed in the slot. The two ends of the push card are connected and fixed to the linear frame.

[0013] Preferably, the sliding housing is provided with a sliding guide hole, and a guide post is correspondingly provided inside the outer housing, the guide post being assembled in the sliding guide hole.

[0014] Preferably, at least one U-shaped spring is provided between the electromagnetic drive assembly and the armature assembly. The U-shaped spring acts on the armature assembly, causing the moving contact assembly to tend to close with the stationary contact assembly.

[0015] This utility model has the following beneficial effects:

[0016] 1. High synchronization and arc optimization: Through the design of bridge-type moving contact components and direct-acting frame, precise synchronous action of double moving contacts and stationary contacts is achieved. The symmetrical arrangement of double contacts makes the arc energy evenly distributed between the two sets of breakpoints. Compared with the single-breakpoint structure, the arc energy is significantly reduced, effectively reducing contact oxidation and ablation.

[0017] 2. Enhanced load capacity: The parallel double bridge plate structure doubles the contact area. Combined with the elastic compensation design of the bow-shaped spring, it ensures stable contact pressure under high current conditions, controls the fluctuation range of contact resistance, and significantly reduces the risk of abnormal temperature rise.

[0018] 3. High-efficiency magnetic circuit drive: The optimized combination of permanent magnets and U-shaped armatures constructs a double air gap magnetic circuit. Combined with the spatial layout of the yoke iron plate, it improves the electromagnetic efficiency. The guide post and sliding guide hole structure ensure the linear motion accuracy of the armature assembly, shorten the action response time, and improve reliability.

[0019] 4. Modular and compact structure: The built-in push-card plug-in assembly realizes a reliable transmission connection between the moving contact component and the armature component, while reducing the size in the linear sliding direction and the overall structure.

[0020] 5. Arc extinguishing protection structure: The centrally arranged moving arc extinguishing plate forms a bidirectional arc extinguishing grid structure and a self-driven arc extinguishing mechanism. Combined with the symmetrical distribution of contacts, the arc can be guided to the arc extinguishing plate, further reducing the oxidation and ablation of the contacts, and also enabling faster arc segmentation and cooling. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the external appearance of an embodiment of the present utility model.

[0022] Figure 2 This is a front view schematic diagram of an embodiment of the present utility model (outer shell omitted).

[0023] Figure 3 This is an exploded view of an embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the moving contact component in an embodiment of this utility model.

[0025] Figure 5 This is an assembly diagram of the moving contact component in an embodiment of this utility model.

[0026] Figure 6 This is an assembly diagram of the armature assembly in an embodiment of this utility model.

[0027] 1. Outer shell, 1.1. Slide rail, 1.2.

[0028] Electromagnetic drive assembly 2, yoke 2.1, U-shaped spring 2.2, coil support 2.3;

[0029] Armature assembly 3, sliding housing 3.1, sliding shaft 3.2, permanent magnet 3.3, outer armature 3.4, inner armature 3.5, first space 3.6, second space 3.7, slot 3.8, push card 3.9, sliding guide hole 3.10, limiting protrusion 3.11;

[0030] The stationary contact assembly 4 includes a first lead-out piece 4.1, a second lead-out piece 4.2, a first stationary contact 4.3, and a second stationary contact 4.4.

[0031] Moving contact assembly 5, direct-acting frame 5.1, bridge plate 5.2, first moving contact 5.3, second moving contact 5.4, bow-shaped spring 5.5, frame bottom plate 5.6, frame side plate 5.7, first guide plate 5.8, guide hole / notch 5.9, second guide plate 5.10, guide part 5.11, limiting hole 5.12;

[0032] Arc extinguishing plate 6. Detailed Implementation

[0033] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0034] In the embodiments, such as Figures 1-6 The image shows a direct-acting relay with a bridge-type double-group contact structure, comprising: a housing 1; an electromagnetic drive assembly 2, installed inside the housing 1, for generating electromagnetic force; an armature assembly 3, slidably installed inside the housing 1, reciprocating under the electromagnetic force of the electromagnetic drive assembly 2; a stationary contact assembly 4, having a first lead-out piece 4.1, a second lead-out piece 4.2, a first stationary contact 4.3 disposed on the first lead-out piece 4.1, and a second stationary contact 4.4 disposed on the second lead-out piece 4.2; and a moving contact assembly 5, including... The assembly includes a direct-acting frame 5.1, a bridge plate 5.2, a first moving contact 5.3, and a second moving contact 5.4. The first moving contact 5.3 and the second moving contact 5.4 are respectively located at both ends of the bridge plate 5.2. The middle part of the bridge plate 5.2 is mounted on the direct-acting frame 5.1 and is perpendicular to the sliding direction of the armature assembly 3. The direct-acting frame 5.1 is connected to the armature assembly 3. As the armature assembly 3 slides, it drives the first moving contact 5.3 and the second moving contact 5.4 to close or separate synchronously with the first stationary contact 4.3 and the second stationary contact 4.4, respectively. In this embodiment, the design of the bridge plate 5.2 being centrally mounted on the direct-acting frame 5.1 ensures that the first moving contact 5.3 and the second moving contact 5.4 achieve millimeter-level synchronous displacement under the drive of the armature assembly 3. The synchronous break at the double break point ensures that the arc energy is evenly distributed between the two sets of contacts, reducing the single-point arc temperature and significantly reducing the ablation of the contact material. The rigid connection between the direct-acting frame 5.1 and the armature assembly 3 eliminates the mechanical backlash of the traditional hinge structure, shortens the action response time, and improves the reliability of high-frequency operation.

[0035] In the embodiments, such as Figures 3-5As shown, bridge plate 5.2, first moving contact 5.3, and second moving contact 5.4 are all in two sets, assembled side-by-side in the direct-acting frame 5.1; first stationary contact 4.3 and second stationary contact 4.4 are also correspondingly provided in two sets. The parallel dual-bridge plate structure doubles the contact area, increasing the effective contact area to 1.8-2 times that of the traditional single-bridge plate structure, improving current carrying capacity, ensuring stable contact pressure under high current conditions, and significantly reducing the risk of abnormal temperature rise. Moreover, the dual-bridge plate also has redundancy fault tolerance function, maintaining more than 50% current carrying capacity even when one set of contacts is abnormal, preventing system-level failures.

[0036] In the embodiments, such as Figures 3-5 As shown, the moving contact assembly 5 also includes an arc-shaped spring 5.5, with both ends of the arc-shaped spring 5.5 fixed to both ends of the bridge piece 5.2. The direct-acting frame 5.1 has a base plate 5.6 and two side plates 5.7, with the ends of the side plates 5.7 connected to the armature assembly 3. The bridge piece 5.2 and the arc-shaped spring 5.5 are installed together within the space formed by the base plate 5.6 and the side plates 5.7. The arc-shaped spring 5.5 contacts the armature assembly 3 and is subjected to force. The bridge piece 5.2 can slide in a direction perpendicular to the base frame 5.6 and tends to move closer to the base plate 5.6 under the elastic support of the arc-shaped spring 5.5. After the base plate 5.6, the two side plates 5.7, and the armature assembly 3 of the direct-acting frame 5.1 are assembled, a complete frame structure is formed, restricting the bridge piece 5.2 to only move slightly in the vertical direction and resisting mechanical vibration. The bow-shaped spring 5.5 is provided with a limiting hole 5.12, which is used to position and constrain the limiting protrusion 3.11 on the sliding housing 3.1 of the armature assembly 3. Under the constraint of the frame structure, the bow-shaped spring 5.5 generates a relatively stable elastic force, and compensates for contact wear through dynamic pressure. After 100,000 operations, the contact pressure decay rate is <15%, ensuring that the contact pressure remains stable under high current conditions.

[0037] In the embodiments, Figure 3-5 As shown, a first guide plate 5.8 is fixed to the side of the frame base plate 5.6 near the bridge piece 5.2, and the guide plate 5.8 has a guide hole / notch 5.9; a second guide plate 5.10 is fixed on the bridge piece 5.2, and the second guide plate 5.10 is bent towards the frame base plate 5.6 to form a guide part 5.11, which slides and guides with the guide hole / notch 5.9. In this embodiment, the cooperation between the guide hole / notch 5.9 and the guide part 5.11 is used to achieve trajectory control of the elastic floating of the bridge piece 5.2, which is beneficial for maintaining the synchronization and pressure balance of the two sets of moving contacts under vibration, impact and temperature change environments.

[0038] In the embodiments, such as Figures 2-4As shown, it also includes an arc-extinguishing plate 6 installed on the housing 1. The guide portion 5.11 follows the movement of the moving contact assembly 5, and its front end remains in contact with or separates from the arc-extinguishing plate 6. The arc-extinguishing plate 6 is arranged in the middle of the moving contact assembly 5, and the first stationary contact 4.3 and the second stationary contact 4.4 are respectively arranged on both sides of the arc-extinguishing plate 6. The arc-extinguishing plate 6 arranged in the middle and the front ends of the multiple guide portions 5.11 form a bidirectional arc-extinguishing grid structure and a self-driven arc-extinguishing mechanism. Combined with the symmetrical distribution of the contacts, the arc is guided to the arc-extinguishing plate 6 by the direct-acting structure of the relay, which significantly improves the high-load breaking capacity and reliability, further reduces the oxidation and ablation of the contacts, and can also achieve faster arc breaking and cooling.

[0039] In the embodiments, such as Figure 3 , Figure 6 As shown, the armature assembly 3 includes: a sliding housing 3.1 with a sliding shaft 3.2 that slides and engages with a slide rail 1.1 inside the outer housing 1; a permanent magnet 3.3 disposed inside the sliding housing 3.1; an outer armature 3.4 and an inner armature 3.5 disposed on the sliding housing 3.1, both being U-shaped plate structures, with their middle portions respectively in contact with the two magnetic poles of the permanent magnet 3.3, and both ends perpendicular to the sliding direction of the sliding housing 3.1 and bent towards the electromagnetic drive assembly 2; a first space 3.6 and a second space 3.7 serving as receiving spaces for the ends of the two yoke plates 2.1 of the electromagnetic drive assembly 2, respectively formed between the first end of the outer armature 3.4 and the first end of the inner armature 3.5, and between the second end of the outer armature 3.4 and the second end of the inner armature 3.5. The U-shaped structures of the outer armature 3.4 and the inner armature 3.5, in conjunction with the permanent magnet 3.3, form a symmetrical magnetic circuit, increasing the magnetic flux density and improving the driving efficiency. The first space 3.6 and the second space 3.7 precisely accommodate the yoke iron sheet 2.1, accurately control the air gap of the magnetic circuit, reduce magnetic resistance and reduce magnetic leakage.

[0040] In the embodiments, such as Figure 3 , Figure 6 As shown, a slot 3.8 is provided on the side of the sliding housing 3.1 facing the moving contact assembly 5. A push card 3.9 is installed in the slot 3.8, and both ends of the push card 3.9 are connected and fixed to the direct-acting frame 5.1. The interference fit between the push card 3.9 and the slot 3.8 achieves a compact assembly and reliable transmission connection between the armature assembly 3 and the moving contact assembly 5. The plug-in connection or integrated injection molding structure replaces the traditional screw fixing, reducing the structural space and adapting to the compact relay packaging requirements.

[0041] In the embodiments, such as Figure 3 , Figure 6As shown, the sliding housing 3.1 is provided with a sliding guide hole 3.10, and a guide post 1.2 is correspondingly provided inside the outer housing 1. The guide post 1.2 is assembled in the sliding guide hole 3.10. The clearance fit between the guide post 1.2 and the sliding guide hole 3.10 serves as a supplementary limit for the slide rail 1.1 and the sliding shaft 3.2, ensuring that the armature assembly 3 is restricted to move only in a straight line, reducing the sway angle, and avoiding contact wear.

[0042] In the embodiments, such as Figure 2 , Figure 3 As shown, at least one U-shaped spring 2.2 is provided between the electromagnetic drive assembly 2 and the armature assembly 3. The U-shaped spring 2.2 acts on the armature assembly 3, causing the moving contact assembly 5 to tend to close with the stationary contact assembly 4. In this embodiment, one leg of the U-shaped spring 2.2 is fixed to the yoke 2.1 of the electromagnetic drive assembly 2, while the other leg remains in an open support state with the armature assembly 3. The U-shaped spring 2.2 provides a restoring force through pre-compression deformation, ensuring that the moving contact assembly 5 reliably closes within 3ms when the power is turned on / off, avoiding the risk of "floating contact". The stiffness coefficient of the U-shaped spring 2.2 is designed to match the electromagnetic force, reducing the critical current deviation of the pull-in / release action and improving the resistance to voltage fluctuations.

[0043] Obviously, the above embodiments of this utility model are merely examples for illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Other obvious variations or modifications derived from the essential spirit of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A direct-acting relay with a bridge-type double-group contact structure, characterized in that, include: Outer shell (1); An electromagnetic drive assembly (2) is installed inside the outer casing (1) and is used to generate electromagnetic force; The armature assembly (3) is slidably installed inside the outer shell (1) and reciprocates under the electromagnetic force of the electromagnetic drive assembly (2); The static contact assembly (4) has a first lead-out piece (4.1), a second lead-out piece (4.2), a first static contact (4.3) disposed on the first lead-out piece (4.1) and a second static contact (4.4) disposed on the second lead-out piece (4.2). The moving contact assembly (5) includes a linear frame (5.1), a bridge plate (5.2), a first moving contact (5.3), and a second moving contact (5.4). The first moving contact (5.3) and the second moving contact (5.4) are respectively disposed at both ends of the bridge plate (5.2). The middle part of the bridge plate (5.2) is mounted on the linear frame (5.1) and is perpendicular to the sliding direction of the armature assembly (3). The linear frame (5.1) is connected to the armature assembly (3). As the armature assembly (3) slides, it drives the first moving contact (5.3) and the second moving contact (5.4) to close or separate synchronously with the first stationary contact (4.3) and the second stationary contact (4.4), respectively.

2. The direct-acting relay with a bridge-type double-group contact structure according to claim 1, characterized in that, The bridge plate (5.2), the first moving contact (5.3) and the second moving contact (5.4) are all in two sets, and are assembled side by side in the linear frame (5.1); the first stationary contact (4.3) and the second stationary contact (4.4) are also provided in two sets.

3. The direct-acting relay with a bridge-type double-group contact structure according to claim 1 or 2, characterized in that, The moving contact assembly (5) also includes an arc-shaped spring (5.5), the two ends of which are fixed to the two ends of the bridge piece (5.2); The linear frame (5.1) has a frame base plate (5.6) and two frame side plates (5.7). The ends of the frame side plates (5.7) are connected to the armature assembly (3). The bridge plate (5.2) and the bow-shaped spring plate (5.5) are installed together in the space formed by the frame base plate (5.6) and the frame side plates (5.7). The bow-shaped spring (5.5) contacts the armature assembly (3) and is subjected to force. The bridge piece (5.2) can slide in a direction perpendicular to the bottom frame (5.6) and tends to approach the bottom plate of the frame (5.6) under the elastic support of the bow-shaped spring (5.5).

4. The direct-acting relay with a bridge-type double-group contact structure according to claim 3, characterized in that, A first guide plate (5.8) is fixed on the side of the frame base plate (5.6) facing the bridge piece (5.2), and the guide plate (5.8) has a guide hole / notch (5.9); a second guide plate (5.10) is fixed on the bridge piece (5.2), and the second guide plate (5.10) is bent toward the frame base plate (5.6) to form a guide part (5.11), and the guide part (5.11) slides and guides the guide hole / notch (5.9).

5. The direct-acting relay with a bridge-type double-group contact structure according to claim 4, characterized in that, It also includes an arc-extinguishing plate (6) installed on the outer casing (1); the guide portion (5.11) moves with the moving contact assembly (5), and its front end remains in contact with or separates from the arc-extinguishing plate (6).

6. The direct-acting relay with a bridge-type double-group contact structure according to claim 1, characterized in that, The armature assembly (3) includes: The sliding housing (3.1) is provided with a sliding shaft (3.2) that slides and engages with the slide rail (1.1) inside the outer housing (1). A permanent magnet (3.3) is disposed within the sliding housing (3.1); The outer armature (3.4) and the inner armature (3.5) are disposed on the sliding housing (3.1). Both are U-shaped plate structures, with the middle part respectively attached to the two magnetic poles of the permanent magnet (3.3), and both ends are perpendicular to the sliding direction of the sliding housing (3.1) and bent toward the electromagnetic drive assembly (2). The first space (3.6) and the second space (3.7), serving as receiving spaces at the ends of the two yoke plates (2.1) of the electromagnetic drive assembly (2), are respectively formed between the first end of the outer armature (3.4) and the first end of the inner armature (3.5), and between the second end of the outer armature (3.4) and the second end of the inner armature (3.5).

7. The direct-acting relay with a bridge-type double-group contact structure according to claim 6, characterized in that, The sliding housing (3.1) has a slot (3.8) on the side facing the moving contact assembly (5). A push card (3.9) is installed in the slot (3.8). The two ends of the push card (3.9) are connected and fixed to the direct-acting frame (5.1).

8. The direct-acting relay with a bridge-type double-group contact structure according to claim 6, characterized in that, The sliding housing (3.1) is provided with a sliding guide hole (3.10), and a guide post (1.2) is correspondingly provided inside the outer housing (1). The guide post (1.2) is assembled in the sliding guide hole (3.10).

9. The direct-acting relay with a bridge-type double-group contact structure according to claim 1, characterized in that, At least one U-shaped spring (2.2) is provided between the electromagnetic drive assembly (2) and the armature assembly (3). The U-shaped spring (2.2) acts on the armature assembly (3) to make the moving contact assembly (5) tend to close with the stationary contact assembly (4).

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