Backup protection breaker trigger device and surge protector

Abstract

The utility model relates to the field of surge protector equipment, and especially relates to a backup protection breaker trigger device and a surge protector. The backup protection breaker trigger device provided by the utility model comprises a trigger assembly, the trigger assembly comprises a magnet assembly and a coil assembly, one end of the magnet assembly is provided with an abutting portion, the coil assembly is sleeved outside the magnet assembly, the abutting portion abuts against a breaking assembly through the magnetic force of the magnet assembly, and the breaking assembly is connected with the magnet assembly. And the coil assembly is electrically connected with a matched current transformer on a grounding circuit of the surge protector.

Description

Technical Field

[0001] This utility model relates to the field of surge protection equipment, and in particular to a backup protection disconnector triggering device and a surge protector. Background Technology

[0002] To enable the active disconnection function of the backup protection trip unit triggering device in surge protectors, a current transformer is currently installed on the main circuit where the surge protection element is located. The current transformer controls the operation of the electromagnetic trip unit. The actuating side of the electromagnetic trip unit engages with the moving contact of the spacer structure located on the grounding circuit via a linkage mechanism. The actuating side of the electromagnetic trip unit, through the disconnection assembly, moves the moving contact to disengage from the grounding circuit, thereby breaking the grounding circuit. However, the electromagnetic trip unit, as a relatively independent integrated component and disconnection assembly, occupies a significant amount of space within the surge protector, hindering product miniaturization. Utility Model Content

[0003] On the one hand, this utility model provides a backup protection disconnector triggering device, which can reduce the space occupied by the structure that realizes the active disconnection function in the surge protector, so as to promote the miniaturization of the product.

[0004] The backup protection disconnector triggering device provided by this utility model includes a triggering component, which includes a magnet component and a coil component. One end of the magnet component has an abutment portion, and the coil component is sleeved outside the magnet component. The abutment portion abuts against the disconnecting component through the magnetic force of the magnet component. The coil component is electrically connected to a current transformer that cooperates with the grounding circuit of the surge protector.

[0005] Furthermore, the abutting part abuts against the connector by magnetic force, and the connector can be movably engaged with the breaking assembly.

[0006] Furthermore, the coil assembly includes a sleeve and a coil wound on the outer wall of the sleeve, the coil being connected to the secondary side of the current transformer via a cable.

[0007] Furthermore, the magnet assembly includes an iron core and a permanent magnet, at least a portion of the iron core passes through the sleeve, one end of the iron core forms the abutment portion, and the other end opposite the abutment portion is located outside the sleeve and connected to the permanent magnet.

[0008] Furthermore, the backup protection disconnector triggering device also includes a housing with an opening at one end. Along the direction from the end opposite to the opening to the opening, the permanent magnet and the iron core are sequentially fixed inside the housing, and a sealing element is provided at the opening.

[0009] Furthermore, the outer wall surface of the housing is provided with grooves for fixing.

[0010] Furthermore, the end face of the abutment portion is flush with the end face of the housing with the opening, the sealing member is located between the side wall surface of the iron core near the abutment portion and the inner wall surface of the housing near the opening, and the connecting member can simultaneously abut against the abutment portion and the end face of the housing with the opening.

[0011] Furthermore, the connector has a connecting end face on one side near the abutment portion and a connecting hole on the other side that can be connected to the splitting assembly by hinge.

[0012] Furthermore, the iron core has a tray structure at one end near the permanent magnet. The tray structure protrudes radially from the iron core. The sleeve and the permanent magnet are located on opposite sides of the tray structure along the axial direction. One end of the sleeve along the axial direction abuts against the tray structure, and the permanent magnet is fixedly connected to the tray structure.

[0013] On the other hand, the surge protector provided by this utility model includes a lightning protection module connected in series to the grounding circuit and a backup protection module. The backup protection module includes an interval structure that can be connected in series to the grounding circuit. The two contacts forming the interval structure can be electrically connected through a disconnecting component in the backup protection disconnector triggering device as described in any of the above. The disconnecting component can be moved by a spring to separate from the two contacts.

[0014] Beneficial effects

[0015] In this scheme, the coil assembly of the backup protection trip unit triggering device is sleeved outside the magnet assembly. The magnet assembly uses magnetic force to resist the trip unit, thereby fixing the trip unit so that the grounding circuit of the backup protection device can remain conductive. When the secondary current generated by the current transformer flows through the coil assembly, it generates a magnetic field. This magnetic field can cancel or partially cancel the magnetic force of the magnet assembly, thereby freeing the trip unit from the constraint of the magnet assembly and causing it to move, thus disconnecting the grounding circuit of the backup protection device.

[0016] This solution utilizes the existing cavity structure of the coil assembly, allowing the magnet assembly to be completely placed inside the cavity structure, or only the contact portion to protrude, so as to facilitate contact with the disconnecting assembly. In this case, the outline volume of the backup protection disconnector triggering device is only slightly larger than the outline volume of the coil assembly, and the outline volume of the part of the magnet assembly located outside the coil assembly is negligible. Therefore, the volume of the backup protection disconnector triggering device can be reduced, thereby reducing its space occupation in the surge protector. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional view of the overall structure of the backup protection disconnector triggering device provided in Embodiments 1 and 2 of this utility model;

[0019] Figure 2 This is a schematic diagram of the outer shell structure of the backup protection disconnector triggering device provided in Embodiments 1 and 2 of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the backup protection disconnector triggering device provided in Embodiment 1 and Embodiment 2 of this utility model, showing the connection part being separated from the iron core.

[0021] Reference numerals: 1-Housing; 2-Iron core; 3-Coil assembly; 4-Tray structure; 5-Permanent magnet; 6-Abutting part; 7-Seal; 8-Connector; 9-Break assembly; 10-Connecting hole; 11-Groove; 12-Opening. Detailed Implementation

[0022] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0023] Example 1

[0024] A backup protection disconnector triggering device includes a triggering assembly, which includes a magnet assembly and a coil assembly 3. One end of the magnet assembly has an abutment portion 6. The coil assembly 3 is sleeved outside the magnet assembly. The abutment portion 6 abuts against the disconnecting assembly 9 through the magnetic force of the magnet assembly. The coil assembly 3 is electrically connected to a current transformer that is matched with the grounding circuit of the surge protector.

[0025] To reduce the size of the backup protection trip trigger device and its space occupation in the surge protector, the coil assembly 3 of the backup protection trip trigger device in this solution is sleeved outside the magnet assembly. The magnet assembly uses magnetic force to resist the trip assembly 9, thereby fixing the trip assembly 9 so that the grounding circuit of the backup protection device can remain conductive. When the secondary current generated by the current transformer flows through the coil assembly 3, a magnetic field is generated. This magnetic field can cancel or partially cancel the magnetic force of the magnet assembly, thereby freeing the trip assembly 9 from the constraint of the magnet assembly, causing it to move, and thus disconnecting the grounding circuit of the backup protection device.

[0026] This solution utilizes the existing cavity structure of coil assembly 3 to completely house the magnet assembly within the cavity structure, or leaves only the contact portion 6 protruding to facilitate contact with the disconnecting assembly 9. In this case, the outline volume of the backup protection disconnector triggering device is only slightly larger than the outline volume of coil assembly 3, and the outline volume of the part of the magnet assembly located outside coil assembly 3 is negligible. Therefore, the volume of the backup protection disconnector triggering device can be reduced, thereby reducing its space occupation in the surge protector.

[0027] In one alternative embodiment, the abutting part 6 abuts against the connector 8 by magnetic force, and the connector 8 can be movably engaged with the breaking assembly 9.

[0028] The connector 8 can be subjected to the magnetic force of the abutment part 6. The connector 8 and the disconnecting assembly 9 are movably connected, such as by rotation, ball joint or flexible structure. This allows the backup protection disconnector triggering device to have a certain amount of redundancy in the connection error when it is connected with the disconnecting assembly 9. Or, if the angle of the disconnecting assembly 9 changes when it moves, the connector 8 can maintain its original angle and not rotate accordingly.

[0029] The main function of the connector 8 in this scheme is to enable the disconnecting components 9 made of other materials to cooperate with the backup protection disconnector triggering device through magnetic force, so that the magnet assembly can retain only the most basic magnetic structure, so that the magnet assembly can be placed in the cavity structure of the coil assembly 3 with a small volume.

[0030] In one alternative embodiment, the coil assembly 3 includes a sleeve and a coil wound on the outer wall of the sleeve, the coil being connected to the secondary side of a current transformer via a cable. The magnet assembly includes an iron core 2 and a permanent magnet 5, at least a portion of the iron core 2 passing through the sleeve, one end of the iron core 2 forming an abutment portion 6, and the other end opposite to the abutment portion 6 located outside the sleeve and connected to the permanent magnet 5.

[0031] The iron core 2 passes through the cavity structure of the sleeve. One end of the iron core 2 along the axial direction forms an abutment part 6, and the other end is fixedly connected to the permanent magnet 5. The iron core 2 is magnetized by the permanent magnet 5 and can attract the connector 8 at one end of the abutment part 6 under the action of magnetic force.

[0032] When a power frequency current capable of triggering backup protection flows through the grounding circuit of the surge protector, the current generated on the secondary side of the current transformer installed on the grounding circuit can cause the coil to generate a magnetic field. This magnetic field can cancel or partially cancel the magnetic force at the contact part 6 of the iron core 2, thereby causing the disconnecting component 9 to move under the action of the spring force, causing the connecting piece 8 to break free from the magnetic attraction constraint of the contact part 6. The disconnecting component 9 is disengaged from the interval structure connected in series to the grounding circuit and separated from the two contacts forming the interval structure, thereby disconnecting the grounding circuit of the backup protection device.

[0033] When the power frequency current flowing through the grounding circuit of the surge protector fails to reach the threshold for triggering backup protection, the current generated on the secondary side of the current transformer installed on the grounding circuit cannot generate a sufficient magnetic field in the coil to offset or partially offset the magnetic field at the contact part 6 of the iron core 2. Therefore, the connector 8 is magnetically attracted to the contact part 6, and the disconnecting component 9 connected to the connector 8 also remains in contact with the two contacts of the interval structure described above, thereby making the grounding circuit of the backup protection device conductive.

[0034] In one optional embodiment, the backup protection disconnector triggering device further includes a housing 1 with an opening 12 at one end. In the direction from the end opposite to the opening 12 to the opening 12, the permanent magnet 5 and the iron core 2 are sequentially fixed inside the housing 1, and a sealing element 7 is provided at the opening 12.

[0035] The housing 1 is fixed to the outer shell of the surge protector. The outer wall of the housing 1 is provided with a groove 11 for fixing. The housing 1 is embedded into the outer shell of the surge protector through the groove 11 on the outer wall, thereby fixing the position of the permanent magnet 5 and the iron core 2. The function of the sealing member 7 is to make the permanent magnet 5 and the iron core 2 located inside the housing 1, forming a relatively independent integrated part. The abutting part 6 of the iron core 2 is located at one end of the opening 12 of the housing 1, and the other end of the iron core 2 and the permanent magnet 5 are located at the opposite end of the opening 12 inside the housing 1. The sealing member 7 is a glue seal or a rubber structure.

[0036] In one optional embodiment, the end face of the abutment 6 is flush with the end face of the housing 1 with the opening 12. The sealing member 7 is located between the side wall of the iron core 2 near the abutment 6 and the inner wall of the housing 1 near the opening 12. The connecting member 8 has a connecting end face on one side near the abutment 6 and a connecting hole 10 on the other side that can be connected to the splitting assembly 9 by hinge. The connecting member 8 can simultaneously abut against the abutment 6 and the end face of the housing 1 with the opening 12.

[0037] In one optional embodiment, a tray structure 4 is provided at one end of the iron core 2 near the permanent magnet 5. The tray structure 4 protrudes radially along the iron core 2. The sleeve and the permanent magnet 5 are located on both sides of the tray structure 4 along the axial direction. One end of the sleeve along the axial direction abuts against the tray structure 4, and the permanent magnet 5 is fixedly connected to the tray structure 4.

[0038] The iron core 2 has abutment portion 6 and tray structure 4 formed at both ends respectively. The tray structure 4 is formed by machining the end of the iron core 2. The radial dimension of the tray structure 4 is larger than the radial dimension of the iron core 2. Therefore, the side of the tray structure 4 facing the abutment portion 6 forms an annular end face. The sleeve of the coil assembly 3 abuts against the annular end face of the tray structure 4 along the axial direction. The end of the sleeve near the opening 12 of the housing 1 is fixed by the sealing element 7 at the opening 12, thereby realizing the axial positioning of the coil assembly 3.

[0039] The permanent magnet 5 is located on the other side of the tray structure 4, and the permanent magnet 5 is fixed to the tray structure 4 by means of adhesive or other methods.

[0040] Example 2

[0041] A surge protector includes a lightning protection module connected in series to a grounding circuit and a backup protection module. The backup protection module includes a spacer structure that can be connected in series to the grounding circuit. The two contacts forming the spacer structure can be electrically connected through a disconnecting component 9 in the backup protection disconnector triggering device of Embodiment 1. The disconnecting component 9 can be moved by a spring to separate from the two contacts.

[0042] The surge protector's lightning protection module contains lightning protection elements, namely varistors and thermal trip components. The lightning protection elements and thermal trip components are connected in series to the grounding circuit structure of the surge protector through the cooperation of the lightning protection module and the base of the surge protector. After the surge protector is connected to the external grounding cable, the lightning protection elements can be connected to the grounding circuit. The specific function of the thermal trip component is the same as that of existing surge protectors.

[0043] The backup protection module has an interval structure, which means that the circuit structure in the backup protection module is disconnected to form an interval structure. There are two contacts on both sides of the interval structure. After the backup protection module is engaged with the base of the surge protector, the interval structure is connected to the grounding circuit of the circuit structure in the backup protection module. That is, at this time, the interval structure, the lightning protection element and the thermal trip assembly are all connected in series to the grounding circuit in the surge protector. The disconnection assembly 9 described in Embodiment 1 includes a conductive element. The function of the conductive element is to contact the two contacts of the interval structure at the same time, thereby connecting the circuit structure in which the interval structure is located.

[0044] When the power frequency current flowing through the grounding circuit of the surge protector fails to reach the threshold for triggering backup protection, the current generated on the secondary side of the current transformer mounted on the circuit structure in the backup protection module is insufficient to generate a sufficient magnetic field in the coil to offset or partially offset the magnetic field at the contact part 6 of the iron core 2. Therefore, the connector 8 is magnetically attracted to the contact part 6, and the conductive part of the disconnecting component 9 connected to the connector 8 also remains in contact with the two contacts described above, thereby ensuring that the backup protection device maintains circuit connection with the grounding circuit.

[0045] When a power frequency current capable of triggering backup protection flows through the grounding circuit of the surge protector, the current generated on the secondary side of the current transformer mounted on the circuit structure within the backup protection module can cause the coil to generate a magnetic field. This magnetic field can cancel or partially cancel the magnetic force at the contact part 6 of the iron core 2, thereby causing the disconnecting component 9 to move under the elastic force of the spring, causing the connecting piece 8 to break free from the magnetic attraction constraint of the contact part 6. The conductive part of the disconnecting component 9 is released from the spacer structure and separated from the two contacts, thereby disconnecting the grounding circuit of the backup protection device and disconnecting the lightning protection module from the grounding circuit, thus protecting the lightning protection module.

[0046] It should be noted that any of the above embodiments are illustrative of the present invention and not limiting of it, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention can be implemented by means of hardware comprising a plurality of different elements and by means of a suitably programmed computer. In the unit claims enumerating a plurality of means, several of these means may be embodied by the same item of hardware. The use of the words first-level, second-level, preceding, and following, etc., does not indicate any order. These words may be interpreted as names.

[0047] The above embodiments are only suitable for illustrating the present utility model and are not intended to limit the present utility model. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions also fall within the scope of the present utility model, and the patent protection scope of the present utility model should be defined by the claims.

Claims

1. A backup protection circuit breaker triggering device, comprising a triggering assembly, characterized in that, The triggering component includes a magnet component and a coil component (3). One end of the magnet component has an abutment portion (6). The coil component (3) is sleeved on the magnet component. The abutment portion (6) abuts against the disconnecting component (9) through the magnetic force of the magnet component. The coil component (3) is electrically connected to a current transformer that cooperates with the grounding circuit of the surge protector.

2. The backup protection disconnector triggering device according to claim 1, characterized in that, The abutting part (6) abuts against the connector (8) by magnetic force, and the connector (8) can be movably engaged with the breaking assembly (9).

3. The backup protection disconnector triggering device according to claim 2, characterized in that, The coil assembly (3) includes a sleeve and a coil wound on the outer wall of the sleeve, the coil being connected to the secondary side of the current transformer via a cable.

4. The backup protection disconnector triggering device according to claim 3, characterized in that, The magnet assembly includes an iron core (2) and a permanent magnet (5). At least a portion of the iron core (2) passes through the sleeve. One end of the iron core (2) forms the abutment portion (6), and the other end opposite to the abutment portion (6) is located outside the sleeve and connected to the permanent magnet (5).

5. The backup protection disconnector triggering device according to claim 4, characterized in that, The backup protection disconnector triggering device also includes a housing (1) with an opening (12) at one end. In the direction from the end opposite to the opening (12) to the opening (12), the permanent magnet (5) and the iron core (2) are fixedly arranged in the housing (1) in sequence. A sealing element (7) is provided at the opening (12).

6. The backup protection disconnector triggering device according to claim 5, characterized in that, The outer wall surface of the housing (1) is provided with a groove (11) for fixing.

7. The backup protection disconnector triggering device according to claim 5, characterized in that, The end face of the abutment (6) is flush with the end face of the housing (1) where the opening (12) is provided. The sealing member (7) is located between the side wall of the iron core (2) near the abutment (6) and the inner wall of the housing (1) near the opening (12). The connecting member (8) can simultaneously abut against the abutment (6) and the end face of the housing (1) where the opening (12) is provided.

8. The backup protection disconnector triggering device according to claim 2, characterized in that, The connector (8) has a connecting end face on one side near the abutment part (6), and a connecting hole (10) on the other side that can be connected to the split assembly (9) by hinge.

9. The backup protection disconnector triggering device according to claim 4, characterized in that, The iron core (2) is provided with a tray structure (4) at one end near the permanent magnet (5). The tray structure (4) protrudes radially from the iron core (2). The sleeve and the permanent magnet (5) are located on both sides of the tray structure (4) along the axial direction. One end of the sleeve along the axial direction abuts against the tray structure (4). The permanent magnet (5) is fixedly connected to the tray structure (4).

10. A surge protector, comprising a lightning protection module and a backup protection module connected in series to a grounding circuit, characterized in that, The backup protection module includes an interval structure that can be connected in series to a grounding circuit. The two contacts forming the interval structure can be electrically connected by a disconnecting component (9) in the backup protection disconnector triggering device as described in any one of claims 1-9. The disconnecting component (9) can be moved by a spring to separate from the two contacts.

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