A touch bridge structure and a switching device

Abstract

A kind of contact bridge structure and switch device, contact bridge structure includes linearly displaceable support component, movable contact bridge component, static contact component, the movable contact bridge component is arranged in scalable mode on the support component;The movable contact bridge component includes adjacent upper and lower lower magnetic conductor and upper magnetic conductor, at least two parallelly arranged contact bridges are respectively constrained in scalable mode between the lower magnetic conductor and the upper magnetic conductor;The telescopic direction of the movable contact bridge component and the contact bridge is same with the linear displacement direction of the support component;When closing, the two ends of the contact bridge are contacted with the static contact component respectively, and form at least two parallel circuits.The switch device uses contact bridge structure.By parallel contact bridge, improve contact reliability, reduce overall contact resistance at the same time, improve short-time withstand capability and contact bridge service life.

Description

Technical Field

[0001] This invention relates to the field of electrical switches, specifically to the contact bridge structure and switching device in a switching device. Background Technology

[0002] Switching devices, as control elements for controlling the on / off state of circuits, include contactors and relays. They are switching devices that use a small current to control a large current. They are widely used in industries such as electric vehicles, charging piles, wind power, photovoltaics, and energy storage. Relays generally include a coil electromagnetic system, an arc-extinguishing chamber, a contact bridge and support mechanism, and a housing.

[0003] Currently, the contact form of DC relays or contactors is that a contact bridge acts as the moving contact, which, under the action of the electromagnetic system and elastic parts, realizes the closing and opening of the main circuit. The advantage of this structure is that it is simple and has a low cost. However, with the rapid development of new energy, the requirements for the contact impedance, load capacity, short-circuit withstand capability, and service life of relays are becoming increasingly higher. At the same time, there are strict limitations on the size of the products. How to improve the load capacity, short-circuit withstand capability, and service life of products within a certain size requires new considerations in the structure.

[0004] To address the aforementioned issues, some contactors currently employ double contact bridges. These double contact bridges are arranged in parallel and spaced apart, with the entire contact bridge supported only by contact bridge springs. However, when the contacts wear out, the uneven wear between the contacts can lead to poor contact, affecting electrical life and reliability. Summary of the Invention

[0005] The purpose of this invention is to provide a contact bridge structure and a switching device. By changing the contact bridge structure to form parallel contact paths, current is diverted, electric repulsion and contact resistance are reduced, arcing and contact loss are reduced, and the redundancy and fault tolerance of the product are improved and its service life is extended.

[0006] To achieve the above objectives, the present invention provides a contact bridge structure, comprising a linearly displaceable support component, a moving contact bridge component, and a stationary contact component. The moving contact bridge component is retractably disposed on the support component. The moving contact bridge component includes a lower magnetic conductor and an upper magnetic conductor arranged adjacent to each other, and at least two parallel contact bridges constrained between the lower magnetic conductor and the upper magnetic conductor in a retractable manner. The retraction direction of the moving contact bridge component and the contact bridges is the same as the linear displacement direction of the support component. When closed, the support component moves the contact bridges, causing both ends of the contact bridges to contact the stationary contact component, forming at least two parallel circuits.

[0007] Preferably, the support component includes a support member and a frame connected and fixed to the support member, and the movable touch bridge component is disposed between the support member and the frame in a retractable manner.

[0008] Preferably, the movable contact bridge assembly is supported on the support member by a contact bridge spring, and in the separated state, the movable contact bridge assembly abuts against the end of the frame away from the support member.

[0009] Preferably, each of the contact bridges is supported by at least one single contact bridge spring.

[0010] Preferably, the two ends of the contact bridge are respectively provided with protruding contact points, and the stationary contact assembly includes two stationary contacts that are insulated from each other; when closed, the contact points at both ends of the contact bridge respectively contact the stationary contacts.

[0011] Preferably, at adjacent sides of two adjacent contact bridges, a plurality of limiting notches are provided at intervals along the length direction of the contact bridge. A guide limiting block is provided at the limiting notch. The guide limiting block is disposed on the lower magnetic conductor. The horizontal position of the contact bridge is positioned by the cooperation of the guide limiting block with the lower magnetic conductor and the upper magnetic conductor. The vertical displacement space of the contact bridge is limited by the cooperation of the lower magnetic conductor and the upper magnetic conductor.

[0012] Preferably, the lower magnetic conductor has a U-shaped structure, the guide limiting block is disposed at the bottom of the U-shaped groove of the U-shaped structure, the contact bridge is located in the U-shaped groove of the lower magnetic conductor, and the upper magnetic conductor is located at the opening end of the U-shaped groove of the lower magnetic conductor, thereby constraining the contact bridge.

[0013] Preferably, a limiting hole is provided at a symmetrical position along the length direction of the contact bridge on the bottom of the U-shaped groove of the lower conductor corresponding to each contact bridge, and the single contact bridge spring is disposed in the limiting hole, with one end of the single contact bridge spring abutting the bottom of the limiting hole and the other end abutting the contact bridge.

[0014] The present invention also provides a switching device, including a driving mechanism and the contact bridge structure driven by the driving mechanism, wherein the support component is connected to the driving mechanism.

[0015] Preferably, the switching device is a relay or a DC contactor.

[0016] The present invention also provides a switching device, including a driving mechanism and a contact bridge structure driven by the driving mechanism, wherein the support member is connected to the driving mechanism.

[0017] Preferably, the switching device is a relay or a DC contactor.

[0018] The contact bridge structure of the present invention, through at least two contact bridges arranged in parallel, forms two conducting circuits when they come into contact with the stationary contact. The main circuit current is shunt through the two circuits, thereby reducing the current in each circuit and thus reducing the electro-repulsive force of the contact bridge structure. The overall electro-repulsive force is reduced by 50% compared with a single contact bridge, which greatly improves the short-term withstand capability.

[0019] By using at least two parallel contact bridges, at least two parallel circuit paths are formed after the contact bridges come into contact with the stationary contact, effectively reducing the overall contact resistance of the contact bridges. Ideally, the total impedance of a double contact bridge is about 71% of the contact impedance of a single contact bridge. In extreme cases, when the contact is heavily contaminated or oxidized, the contact impedance of a double contact bridge is about 71% to 100% of the contact impedance of a single contact bridge.

[0020] When one contact bridge has poor contact, the other contact bridge can still be displaced and connected, improving the system's fault tolerance and reliability.

[0021] Two single-contact springs are installed under each contact bridge to ensure independent contact between each contact bridge and the stationary contact, as well as the reliability of the contact.

[0022] By combining a single contact bridge spring with a contact bridge spring, the contact between the contact bridge and the stationary contact is made more reliable. By placing contact points at the center of both ends of the contact bridge and aligning them directly with the stationary contact, the contact points ensure contact stress to reduce contact resistance while maintaining a centered distribution of contact, mechanical wear, and electrical wear. This prevents misalignment and related contact wear problems during long-term use, thus extending the service life of the contact bridge. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural schematic diagram of the present invention.

[0024] Figure 2 This is a side view structural diagram.

[0025] Figure 3 yes Figure 2 AA sectional view.

[0026] Figure 4 yes Figure 3 BB cross-sectional view.

[0027] Figure label:

[0028] Support component 1, contact bridge spring 2, contact bridge 3, single contact bridge spring 5, lower magnetic conductor 6, upper magnetic conductor 7, frame 8, stationary contact 9, guide limit block 10, contact point 12. Detailed Implementation

[0029] The contact bridge structure of the present invention includes a linearly displaceable support component, a moving contact bridge component, and a stationary contact component. The moving contact bridge component is retractably disposed on the support component. The moving contact bridge component includes a lower magnetic conductor and an upper magnetic conductor arranged adjacent to each other, and at least two parallel contact bridges constrained between the lower magnetic conductor and the upper magnetic conductor in a retractable manner. The retraction direction of the moving contact bridge component and the contact bridges is the same as the linear displacement direction of the support component. When closed, the support component moves the contact bridges, so that both ends of the contact bridges contact the stationary contact component, forming at least two parallel circuits.

[0030] The following describes preferred embodiments in detail with reference to the accompanying drawings. The directional terms used are for reference only and do not constitute a limitation on the technical solutions of this invention.

[0031] The contact bridge structure of the present invention is shown in the figure. Figures 1 to 4 This includes support components, moving contact bridge components, and stationary contact components.

[0032] The support components include a support 1 and a frame 8. The moving contact bridge assembly is located between the support 1 and the frame 8 and is mounted on the support 1 via a contact bridge spring 2.

[0033] The moving contact bridge assembly includes at least two contact bridges 3 connected in parallel, a single contact bridge spring 5, a lower magnetic conductor 6, and an upper magnetic conductor 7; the stationary contact assembly includes two stationary contacts 9; wherein:

[0034] The stationary contact assembly includes two stationary contacts 9 that are insulated from each other. The two stationary contacts 9 are respectively positioned at the center of the width direction of the two ends of the contact bridge 3. When closed, the two ends of the contact bridge 3 make conductive contact with the stationary contacts 9.

[0035] The lower magnetic conductor 6 of the moving contact bridge assembly has a U-shaped structure, and the upper magnetic conductor 7 is located at the opening end of the U-shaped groove of the lower magnetic conductor 6. A receiving space is formed between the lower magnetic conductor 6 and the upper magnetic conductor 7. The two contact bridges 3 are arranged in parallel in the U-shaped groove of the lower magnetic conductor 6. Along the length of the contact bridge, several first notches are respectively opened at corresponding positions on the adjacent sides of the two contact bridges 3. The first notches facing each other on the two contact bridges 3 form a limiting space, and several limiting spaces are symmetrically distributed along the length of the contact bridge. A guide limiting block 10 protruding from the surface of the lower magnetic conductor 6 is provided on the lower magnetic conductor 6 corresponding to the limiting space. The guide limiting block 10 is vertically inserted into the limiting space formed by the first notches facing each other on the two adjacent contact bridges 3. The guide limiting block 10, together with the side wall of the U-shaped structure of the lower magnetic conductor 6, positions the horizontal position of the contact bridge 3 to prevent the contact bridge from shifting in the horizontal direction. On both sides of the center position along the length of the contact bridge, a single contact bridge spring 5 is symmetrically arranged below each contact bridge 3, that is, two single contact bridge springs 5 ​​are arranged below each contact bridge 3 to support the contact bridge 3. Limiting grooves are respectively provided at corresponding positions at the bottom of the U-shaped groove of the lower magnetic conductor 6. The single contact bridge spring 5 is placed in the limiting groove, with one end abutting the bottom of the limiting groove and the other end abutting the contact bridge 3. To better abut the contact bridge 3, limiting grooves or limiting protrusions are provided at corresponding positions on the contact bridge 3, so that the other end of the single contact bridge spring 5 abuts against the outer periphery of the limiting groove or limiting protrusion of the contact bridge 3, and the single contact bridge spring 5 is always in a compressed state.

[0036] The two ends of the contact bridge 3 are provided with contact points 12. The contact points 12 are symmetrically arranged in the length direction relative to the two contact bridges to ensure that the contact points 12 are in direct contact with the stationary contact 9. By contacting the stationary contact through the contact points, while ensuring the contact stress to reduce the contact resistance, the contact, mechanical wear and electrical wear are centrally distributed, preventing the contact bridge from tilting and causing contact wear problems during long-term use, and improving the service life.

[0037] The frame 8 is U-shaped, and the open end of the U-shaped groove of the frame 8 is connected and fixed to the support member 1, for example, by a snap-fit ​​connection. The upper magnetic conductor 7, the lower magnetic conductor 6, and the inner contact bridge 3 are positioned between the frame 8 and the support member 1, with the lower magnetic conductor 6 facing the support member 1. The upper magnetic conductor 7 is fixedly connected to the bottom of the U-shaped groove of the frame 8, for example, by riveting. A contact bridge spring 2 is provided between the lower magnetic conductor 6 and the support member 1. An annular limiting groove is provided on the support member 7, and a positioning boss is provided on the bottom surface of the lower magnetic conductor 6 facing the support member 7. One end of the contact bridge spring 2 is located in the annular limiting groove on the support member 7 in an abutting manner, and the other end is located on the outer periphery of the limiting boss on the bottom surface of the lower magnetic conductor 6 in an abutting manner. In the separated state, the contact bridge spring 2 abuts against the lower magnetic conductor 6, thus constraining the contact bridge 3 between the lower magnetic conductor 6 and the upper magnetic conductor 7.

[0038] The contact bridge 3 is constrained by the contact bridge spring 2, support member 1, frame 8, upper magnetic conductor 7, and lower magnetic conductor 6. The contact bridge spring 2 provides support and resistance to the assembly formed by the contact bridge 3, the lower magnetic conductor 6, and the upper magnetic conductor 7.

[0039] By setting two single contact bridge springs 5 ​​under each contact bridge 3, each contact bridge 3 can be displaced independently, ensuring that the contacts at both ends of each contact bridge 3 can reliably contact the stationary contact 9.

[0040] Working principle of touch bridge structure:

[0041] When closed, the support member 1 moves the moving contact bridge assembly toward the stationary contact 9. The contact points 12 at both ends of the contact bridge 3 contact the stationary contact 9 respectively. The support member 1 continues to move, and the single contact bridge spring 5 is compressed. During the process of the support member 1 continuing to move until it stops, the single contact bridge spring 5 is further compressed, and the contact bridge spring 2 is compressed, so that the contact bridge 3 and the stationary contact 9 can make reliable contact. With the cooperation of the contact bridge spring 2 and the single contact bridge spring 5, the contact bridge 3 and the stationary contact 9 are ensured to make reliable contact, and the contact resistance is reduced.

[0042] When separated, the support 1 moves the moving contact bridge assembly away from the stationary contact 9, and the contact bridge 3 disengages from the stationary contact 9.

[0043] The two contact bridges 3 are connected in parallel, which can effectively reduce contact resistance; at the same time, the current shunting between the two contact bridges 3 can effectively reduce the electric repulsion force and improve the system's short-term withstand capability.

[0044] When one of the contact bridges and the stationary contact fails to make proper contact, the other contact bridge and the stationary contact continue to maintain conduction, thus improving the reliability and redundancy of the relay.

[0045] The aforementioned contact bridge structure is used in switching devices, such as contactors and relays. The displacement of the support component 1 is driven by the drive mechanism of the switching device. The drive mechanism can be an electromagnetic drive mechanism, a motor drive mechanism, etc.

Claims

1. A touch bridge structure, characterized in that, The device includes a linearly displaceable support component, a moving contact bridge component, and a stationary contact component. The moving contact bridge component is retractably mounted on the support component. The moving contact bridge component includes a lower magnetic conductor and an upper magnetic conductor arranged adjacent to each other, and at least two parallel contact bridges constrained between the lower magnetic conductor and the upper magnetic conductor in a retractable manner. The retraction direction of the moving contact bridge component and the contact bridges is the same as the linear displacement direction of the support component. When closed, the support component moves the contact bridges, causing both ends of the contact bridges to contact the stationary contact component, forming at least two parallel circuits.

2. The touch bridge structure according to claim 1, characterized in that, The support component includes a support member and a frame connected and fixed to the support member, and the movable touch bridge component is disposed between the support member and the frame in a retractable manner.

3. The touch bridge structure according to claim 2, characterized in that, The movable contact bridge assembly is supported on the support member by a contact bridge spring. In the separated state, the movable contact bridge assembly abuts against the end of the frame away from the support member.

4. The touch bridge structure according to claim 1, characterized in that, Each of the aforementioned contact bridges is supported by at least one single contact bridge spring.

5. The touch bridge structure according to claim 4, characterized in that, The contact bridge has protruding contact points at both ends, and the stationary contact assembly includes two stationary contacts that are insulated from each other. When closed, the contact points at both ends of the contact bridge contact the stationary contacts respectively.

6. The touch bridge structure according to claim 4, characterized in that, At adjacent sides of two adjacent contact bridges, a number of limiting notches are provided at intervals along the length of the contact bridge. A guide limiting block is provided at the limiting notch. The guide limiting block is disposed on the lower magnetic conductor. The guide limiting block cooperates with the lower magnetic conductor and the upper magnetic conductor to position the horizontal position of the contact bridge. The lower magnetic conductor and the upper magnetic conductor cooperate to limit the vertical displacement space of the contact bridge.

7. The touch bridge structure according to claim 6, characterized in that, The lower magnetic conductor has a U-shaped structure, the guide limiting block is disposed at the bottom of the U-shaped groove of the U-shaped structure, the contact bridge is located in the U-shaped groove of the lower magnetic conductor, and the upper magnetic conductor is located at the opening end of the U-shaped groove of the lower magnetic conductor, thereby constraining the contact bridge.

8. The touch bridge structure according to claim 7, characterized in that, Limiting holes are provided at symmetrical positions along the length of the contact bridge on the bottom of the U-shaped groove of the lower conductor corresponding to each contact bridge. The single contact bridge spring is disposed in the limiting hole, with one end of the single contact bridge spring abutting the bottom of the limiting hole and the other end abutting the contact bridge.

9. A switching device, characterized in that, It includes a drive mechanism and a touch bridge structure according to any one of claims 1 to 8 driven by the drive mechanism, wherein the support component is connected to the drive mechanism.

10. The switching device according to claim 9, characterized in that, The switching device is a relay or a DC contactor.

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