Backup protection breaker control device and surge protector

Abstract

The utility model relates to the field of surge protector equipment, in particular to a backup protection breaker control device and a surge protector. The backup protection breaker control device comprises a linkage assembly and a trigger assembly, the trigger assembly comprises a permanent magnet, an action assembly and a coil assembly, one end of the action assembly is provided with an abutting portion, the other end of the action assembly is connected with the linkage assembly, the coil assembly is arranged outside the action assembly in a sleeved mode, and the permanent magnet is arranged on the permanent magnet. The abutting part abuts against the permanent magnet through the magnetic force of the permanent magnet, and the coil assembly is electrically connected with a current transformer matched with 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 control device and a surge protector. Background Technology

[0002] To enable the active disconnection function of the backup protection circuit breaker control 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 a linkage component, 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 linkage component, 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 control 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 circuit breaker control device provided by this utility model includes a linkage component and a triggering component. The triggering component includes a permanent magnet, an actuating component, and a coil component. One end of the actuating component has an abutting part, and the other end is connected to the linkage component. The coil component is sleeved outside the actuating component. The abutting part abuts against the permanent magnet through the magnetic force of the permanent magnet. The coil component is electrically connected to a current transformer that cooperates with the grounding circuit of the surge protector.

[0005] Furthermore, the action component and the linkage component work together.

[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 actuating component includes a core, at least a portion of which passes through the sleeve, one end of which forms the abutment portion, and the other end opposite to the abutment portion is located outside the sleeve and connected to the linkage component.

[0008] Furthermore, the backup protection disconnector control device also includes a housing with an open end. In the direction from the end opposite to the open end to the open end, the permanent magnet and the core are sequentially arranged in the housing, and the permanent magnet and the sleeve are respectively fixedly connected to the housing.

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

[0010] Furthermore, the core body has a cover at one end near the linkage assembly. The cover protrudes radially from the core body and is located inside the housing near the opening.

[0011] Furthermore, the side annular surface of the cover is fitted to the inner wall surface of the housing near the opening.

[0012] Furthermore, the cover has a connecting end face on one side near the sleeve, and a connecting hole on the other side that can be connected to the linkage assembly by hinge.

[0013] The surge protector provided by this utility model includes a lightning protection module connected in series to a grounding circuit and a backup protection module. 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 through a linkage component in the backup protection disconnector control device as described in any of the above claims. The linkage component can be moved by a spring to separate from the two contacts. Beneficial effects

[0014] In this design, the coil assembly of the backup protection circuit breaker control device is sleeved outside the actuating assembly. The actuating assembly is connected to the linkage assembly and is fixed by magnetic force against the permanent magnet, thus ensuring that the grounding circuit of the backup protection device remains connected. This design can utilize the existing cavity structure of the coil assembly to place the actuating assembly and the permanent magnet entirely within the cavity structure, or leave only a part of the actuating assembly protruding to facilitate connection with the linkage assembly. In this case, the outline volume of the backup protection circuit breaker control device is only slightly larger than the outline volume of the coil assembly, and the outline volume of the part of the actuating assembly located outside the coil assembly is negligible. Therefore, the size of the backup protection circuit breaker control device can be reduced, thereby reducing its space occupation in the surge protector. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a cross-sectional view of the overall structure of the backup protection disconnector control device provided in Embodiments 1 and 2 of this utility model;

[0017] Figure 2This is a schematic diagram of the structure of the backup protection circuit breaker control device provided in Embodiment 1 and Embodiment 2 of this utility model, showing the separation of the permanent magnet from the core.

[0018] Reference numerals: 1-Shell; 2-Core; 3-Coil assembly; 4-Cover; 5-Permanent magnet; 6-Connecting hole; 7-Linkage assembly; 8-Opening; 9-Abutting part. Detailed Implementation

[0019] 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. Example 1

[0020] A backup protection circuit breaker control device includes a linkage component 7 and a triggering component. The triggering component includes a permanent magnet 5, an actuation component, and a coil component 3. One end of the actuation component has a contact portion 9, and the other end is connected to the linkage component 7. The coil component 3 is sleeved outside the actuation component. The contact portion 9 abuts against the permanent magnet 5 through the magnetic force of the permanent magnet 5. The coil component 3 is electrically connected to a current transformer that is matched with the grounding circuit of the surge protector.

[0021] To reduce the size of the backup protection circuit breaker control device and minimize its space occupation within the surge protector, the coil assembly 3 of the backup protection circuit breaker control device in this design is mounted outside the actuating assembly. The actuating assembly is connected to the linkage assembly 7 and is further fixed by magnetic force against the permanent magnet 5, thus ensuring that the grounding circuit of the backup protection device remains connected. 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 permanent magnet 5, thereby causing the linkage assembly 7 to drive the actuating assembly to break free from the constraint of the permanent magnet 5 and move, thereby disconnecting the grounding circuit of the backup protection device.

[0022] This solution utilizes the existing cavity structure of coil assembly 3 to house the entire actuating component and permanent magnet 5, or allows only a portion of the actuating component to extend outwards for connection with the linkage component 7. In this case, the outline volume of the backup protection circuit breaker control device is only slightly larger than that of coil assembly 3, and the outline volume of the portion of the actuating component outside coil assembly 3 is negligible. Therefore, the size of the backup protection circuit breaker control device can be reduced, thereby reducing its space occupation in the surge protector.

[0023] In one alternative implementation, the action component and the linkage component 7 are activatingly coupled.

[0024] The actuating component and the linkage component 7 are movably coupled, such as by rotation, ball joint, or by flexible connection through a flexible structure. This allows the backup protection disconnector control device to have a certain amount of redundancy in the coupling error when it is coupled with the linkage component 7. Or, if the linkage component 7 changes angle when it moves, the actuating component can maintain its original angle of coupling with the coil component 3 and will not rotate accordingly.

[0025] In one alternative embodiment, the coil assembly 3 includes a sleeve and a coil wound on the outer wall of the sleeve. The coil is connected to the secondary side of the current transformer via a cable. The actuating assembly includes a core 2, at least a portion of which passes through the sleeve. One end of the core 2 forms an abutment 9, and the other end opposite to the abutment 9 is located outside the sleeve and connected to the linkage assembly 7.

[0026] One end of the core 2 along the axial direction forms an abutment part 9, and the other end is connected to the linkage component 7. The part of the core 2 connected to the linkage component 7 is located outside the cavity structure of the sleeve, while the other part extends into the cavity structure of the sleeve near the abutment part 9. The permanent magnet 5 is also embedded in the cavity structure of the sleeve. Inside the cavity structure of the sleeve, the contact part 9 is attracted by the permanent magnet 5 and resists it. When the power frequency current that can trigger the backup protection flows through the grounding circuit of the surge protector, the current generated on the secondary side of the current transformer sleeved on the grounding circuit can make the coil generate a magnetic field. This magnetic field can cancel or partially cancel the magnetic force of the permanent magnet 5 on the core 2, so that the linkage component 7 drives the core 2 to get rid of the magnetic attraction constraint at the contact part 9 under the elastic force of the spring and move. During the movement, the core 2 is constrained by the cavity structure of the sleeve and always maintains the axial movement along the cavity structure of the sleeve. Finally, the linkage component 7 is disengaged from the spacer structure connected in series to the grounding circuit and separates from the two contacts forming the spacer structure, thereby disconnecting the grounding circuit of the backup protection device.

[0027] 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 is insufficient to generate a sufficient magnetic field in the coil to offset or partially offset the magnetic field at the contact part 9 of the core 2. Therefore, the connector is magnetically attracted to the contact part 9, and the linkage component 7 connected to the connector 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.

[0028] In one optional embodiment, the backup protection disconnector control device further includes a housing 1 with an opening 8 at one end. In the direction from the end opposite to the opening 8 to the opening 8, a permanent magnet 5 and a core 2 are sequentially arranged inside the housing 1, and the permanent magnet 5 and the sleeve are respectively fixedly connected to the housing 1.

[0029] 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 for fixing. The housing 1 is embedded into the outer shell of the surge protector through the groove on the outer wall, thereby fixing the position of the permanent magnet 5 and the coil assembly 3 to form a relatively independent integrated component. The connection between the core 2 and the linkage assembly 7 is located at the opening 8 of the housing 1.

[0030] In one alternative embodiment, a cover 4 is provided at one end of the core 2 near the linkage component 7. The cover 4 protrudes radially from the core 2 and is located inside the housing 1 near the opening 8.

[0031] The core 2 has abutment portions 9 and a cover 4 machined at both ends. The radial dimension of the cover 4 is larger than that of the core 2. Therefore, the side of the cover 4 facing the abutment portion 9 forms an annular connecting end face, and the other side is provided with a lifting lug. A connecting hole 6 is opened on the lifting lug, and the linkage assembly 7 can be hinged to the core 2 through the connecting hole 6. One axial end of the sleeve of the coil assembly 3 abuts against the annular end face of the cover 4, thereby realizing the axial positioning of the coil assembly 3 and the core 2.

[0032] In one alternative embodiment, the side annular surface of the cover 4 is fitted to the inner wall surface of the housing 1 near the opening 8.

[0033] The cover 4 forms a seal at the opening 8 of the housing 1. The side ring surface of the cover 4 fits against the inner wall surface of the housing 1. When the linkage component 7 moves the core 2 under the action of the spring force, the cover 4 and the housing 1 slide relative to each other. Finally, the cover 4 moves out of the housing 1 through the opening 8. Example 2

[0034] 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. Two contacts forming the spacer structure are electrically connected to each other via a linkage component 7 in a backup protection disconnector control device as described above. The linkage component 7 can be moved by a spring to separate from the two contacts.

[0035] 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.

[0036] 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 linkage component 7 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.

[0037] 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 9 of the core 2. Therefore, the action component is magnetically attracted and abuts against the permanent magnet 5, and the conductive part of the linkage component 7 connected to the action component also remains in contact with the two contacts described above, thereby ensuring that the backup protection device maintains circuit connection with the grounding circuit.

[0038] 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 of the permanent magnet 5 on the actuating component, thereby causing the linkage component 7 to move under the elastic force of the spring, thus freeing the actuating component from the magnetic attraction constraint of the permanent magnet 5. The conductive part of the linkage component 7 is dislodged 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.

[0039] 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.

[0040] 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. The patent protection scope of the present utility model should be defined by the claims.

Claims

1. A backup protection circuit breaker control device, comprising a linkage component (7) and a triggering component, characterized in that, The triggering component includes a permanent magnet (5), an action component, and a coil component (3). One end of the action component has an abutment part (9), and the other end is connected to the linkage component (7). The coil component (3) is sleeved outside the action component. The abutment part (9) abuts against the permanent magnet (5) through the magnetic force of the permanent magnet (5). The coil component (3) is electrically connected to the current transformer that cooperates with the grounding circuit of the surge protector. The coil assembly (3) includes a sleeve and a coil wound on the outer wall of the sleeve. The actuating assembly includes a core (2), at least a portion of which passes through the sleeve. One end of the core (2) forms the abutment (9), and the other end opposite to the abutment (9) is located outside the sleeve and connected to the linkage assembly (7). The backup protection disconnector control device also includes a housing (1) with an opening (8) at one end. In the direction from the end opposite to the opening (8) to the opening (8), the permanent magnet (5) and the core (2) are sequentially arranged in the housing (1). The permanent magnet (5) and the sleeve are respectively fixedly connected to the housing (1). The core (2) has a cover (4) at one end near the linkage component (7). The cover (4) protrudes radially from the core (2) and is located inside the housing (1) near the opening (8).

2. The backup protection disconnector control device according to claim 1, characterized in that, The action component and the linkage component (7) work together.

3. The backup protection disconnector control device according to claim 2, characterized in that, The coil is connected to the secondary side of the current transformer via a cable.

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

5. The backup protection disconnector control device according to claim 1, characterized in that, The side ring surface of the cover (4) is in contact with the inner wall surface of the shell (1) near the opening (8).

6. The backup protection disconnector control device according to claim 1, characterized in that, The cover (4) has a connecting end face on one side near the sleeve, and a connecting hole (6) on the other side that can be connected to the linkage assembly (7) by hinge.

7. 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 linkage component (7) in the backup protection disconnector control device as described in any one of claims 1-6. The linkage component (7) can be moved by a spring to separate from the two contacts.

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