Backup protection breaker and surge protector

Abstract

The application relates to the field of surge protector devices, in particular to a backup protection disconnector and a surge protector. The backup protection disconnector provided by the application comprises a magnet assembly, a coil assembly and a disconnection device, one end of the magnet assembly is provided with an abutting part, the coil assembly is sleeved outside the magnet assembly, the abutting part abuts against the disconnection device through the magnetic force of the magnet assembly, and the coil assembly is electrically connected with a current transformer matched on a grounding circuit of the surge protector.

Description

Technical Field

[0001] This invention relates to the field of surge protection devices, and in particular to a backup protection disconnector and a surge protector. Background Technology

[0002] To enable the active disconnection function of the backup protection circuit breaker 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, through a linkage mechanism, engages with a moving contact block in a spacer structure located on the grounding circuit. The actuating side of the electromagnetic trip unit, via the linkage mechanism, moves the moving contact block to disengage from the grounding circuit, thereby breaking the grounding circuit. However, the electromagnetic trip unit, as a relatively independent integrated component and linkage mechanism, occupies a significant amount of space within the surge protector, hindering product miniaturization. Summary of the Invention

[0003] On the one hand, the present invention provides a backup protection disconnector that 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 provided by the present invention includes a magnet assembly, a coil assembly, and a disconnecting device. One end of the magnet assembly has an abutment portion. The coil assembly is sleeved outside the magnet assembly. The abutment portion abuts against the disconnecting device through the magnetic force of the magnet assembly. The coil assembly 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 disconnecting device.

[0006] Furthermore, the disconnecting device includes a first movable member and a second movable member. One end of the second movable member is hinged to the connecting member, and the other end is hinged to the first mating end of the first movable member. The second mating end of the first movable member abuts against the movable contact block along the moving direction of the movable contact block. The movable contact block can push the first movable member to rotate around the pivot located between the first mating end and the second mating end along the moving direction until it disengages from the movable contact block.

[0007] Furthermore, the breaking device includes two symmetrically arranged movable components, each of which includes a first movable element and a second movable element.

[0008] 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.

[0009] 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.

[0010] Furthermore, the backup protection disconnector also includes a housing with an opening at one end. The permanent magnet and the iron core are arranged sequentially inside the housing along the direction from the end opposite to the opening. A seal is provided at the opening.

[0011] Furthermore, the second mating ends of the two first movable parts are enclosed to form a clamp-shaped structure, and the movable contact block is provided with a lifting lug at one end near the first movable part along the moving direction, and the clamp-shaped structure can engage with the lifting lug.

[0012] Furthermore, the end face of the abutting end 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 abutting end and the inner wall surface of the housing near the opening, and the connecting member can simultaneously abut against the abutting end and the end face of the housing with the opening.

[0013] On the other hand, the surge protector provided by the present invention includes a lightning protection module and a backup protection module connected in series to a grounding circuit. The backup protection module includes an interval structure that can be connected in series to a grounding circuit. Two contacts forming the interval structure can be electrically connected through a moving contact. The moving contact is connected to a disconnecting component in the backup protection disconnector as described in any of the above claims. The disconnecting component can overcome the spring force of the moving contact, so that the moving contact remains in contact with the two contacts.

[0014] Beneficial effects

[0015] In this solution, the coil assembly of the backup protection breaker is fitted outside the magnet assembly. That is, this solution can utilize the existing cavity structure of the coil assembly to completely place the magnet assembly inside the cavity structure, or only leave the contact part protruding to facilitate contact with the breaker assembly. In this case, the outline volume of the backup protection breaker is only slightly larger than the outline volume of the coil assembly, and the outline volume of the part of the magnet assembly outside the coil assembly is negligible. Therefore, the volume of the backup protection breaker can be reduced, thereby reducing its space occupation in the surge protector. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the backup protection disconnector provided in Embodiments 1 to 3 of the present invention;

[0018] Figure 2 These are schematic diagrams of the breaking device provided in Embodiments 1 to 3 of the present invention;

[0019] Figure 3 This is a cross-sectional schematic diagram of the magnet assembly, coil assembly, and disconnection device provided in Embodiments 1 to 3 of the present invention.

[0020] Reference numerals: 1-Disconnection device; 2-Housing; 3-Contact; 4-Moving contact block; 5-Current transformer; 6-Lifting lug; 7-First moving part; 8-Second moving part; 9-Rotating shaft; 10-Connector; 11-Coil assembly; 12-Iron core; 13-Permanent magnet; 14-Second mating end; 15-Crossbeam; 16-First mating end; 17-Channel structure. Detailed Implementation

[0021] The specific embodiments of the present invention 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 present invention.

[0022] Example 1

[0023] like Figures 1 to 3 The backup protection disconnector shown includes a magnet assembly, a coil assembly 11 and a disconnecting device 1. One end of the magnet assembly has an abutment portion. The coil assembly 11 is sleeved outside the magnet assembly. The abutment portion abuts against the disconnecting device 1 through the magnetic force of the magnet assembly. The coil assembly 11 is electrically connected to a current transformer 5 that is matched with the grounding circuit of the surge protector.

[0024] To reduce the size of the backup protection disconnector and its space occupation in the surge protector, the coil assembly 11 of the backup protection disconnector in this solution is sleeved outside the magnet assembly. The magnet assembly uses magnetic force to resist the disconnecting assembly, thereby fixing the disconnecting assembly so that the grounding circuit of the backup protection device can remain conductive. When the secondary current generated by the current transformer 5 flows through the coil assembly 11, it generates a magnetic field. This magnetic field can cancel or partially cancel the magnetic force of the magnet assembly, thereby freeing the disconnecting assembly from the constraint of the magnet assembly, causing it to move, and thus disconnecting the grounding circuit of the backup protection device.

[0025] This solution utilizes the existing cavity structure of the coil assembly 11 to completely house the magnet assembly within the cavity structure, or to leave only the contact portion protruding to facilitate contact with the disconnecting assembly. In this case, the outline volume of the backup protection disconnector is only slightly larger than the outline volume of the coil assembly 11, and the outline volume of the part of the magnet assembly located outside the coil assembly 11 is negligible. Therefore, the volume of the backup protection disconnector can be reduced, thereby reducing its space occupation in the surge protector.

[0026] In one alternative embodiment, the abutting part abuts against the connector 10 by magnetic force, and the connector 10 can be movably engaged with the disconnecting device 1.

[0027] The connector 10 can be subjected to the magnetic force of the contact part. The connector 10 is in movable cooperation with the disconnecting assembly, such as rotational cooperation, ball joint cooperation, or flexible connection through a flexible structure. This allows the backup protection disconnector to have a certain amount of cooperation error redundancy when cooperating with the disconnecting assembly, or the connector 10 can maintain its original angle and not rotate when the disconnecting assembly changes angle during movement.

[0028] The main function of the connector 10 in this scheme is to enable the disconnecting components of other materials to cooperate with the backup protection disconnector 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 11 with a small volume.

[0029] In one optional embodiment, the disconnecting device 1 includes a first movable member 7 and a second movable member 8. One end of the second movable member 8 is hinged to the connecting member 10, and the other end is hinged to the first mating end 16 of the first movable member 7. The second mating end 14 of the first movable member 7 abuts against the movable contact 4 along the moving direction of the movable contact 4. The movable contact 4 can push the first movable member 7 to rotate around the pivot 9 located between the first mating end 16 and the second mating end 14 along the moving direction until it disengages from the movable contact 4.

[0030] The first movable member 7 and the second movable member 8 form a linkage system. The first movable member 7 is provided with a rotating shaft 9. The length between the rotating shaft 9 and the second mating end 14 is less than the length between the rotating shaft 9 and the first mating end 16. Therefore, by using the first movable member 7, the smaller magnetic force provided by the magnet assembly can overcome the spring force of the larger moving contact block 4, thereby reducing the setting specifications of the magnet assembly and the coil assembly 11, and thus reducing the size of the magnet assembly and the coil assembly 11.

[0031] One end of the second movable member 8 is hinged to the connecting member 10, and the other end is hinged to the first mating end 16 of the first movable member 7. The function of the second movable member 8 is to cooperate with the rotation of the first movable member 7 so that the moving direction of the connecting member 10 and the moving contact 4 is consistent. Specifically, when the magnet assembly loses its constraint on the moving contact 4, the moving contact 4 moves under the action of the spring and pushes the first movable member 7 to rotate around the rotating shaft 9. The first movable member 7 is hinged to the second movable member 8, and the two can rotate. The second movable member 8 is also hinged to the connecting member 10, and the two can also rotate. Therefore, the second movable member 8 can rotate in the opposite direction to the first movable member 7, so that the connecting member 10 can move along the moving direction of the moving contact 4.

[0032] Preferably, the disconnecting device 1 includes two symmetrically arranged movable components, each movable component including a first movable element 7 and a second movable element 8.

[0033] The two first movable parts 7 of the two sets of movable components clamp the movable contact 4 towards each other, or enclose it to form a constraint end face on the movable contact 4 along its moving direction, so that the movable contact 4 cannot move under the elastic force of the spring.

[0034] The two first moving parts 7 are connected to the same rotating shaft 9.

[0035] The two second movable parts 8 are connected to the same hinge point on the connecting part 10.

[0036] When the movable contact 4 moves under the action of the spring and pushes the two first movable parts 7 to rotate in opposite directions around the pivot 9, the first movable parts 7 drive the second movable parts 8, which are hinged to each other, to rotate. Therefore, the two second movable parts 8 also rotate in opposite directions. The combined motion of the two second movable parts 8 at the hinge point with the connecting member 10 allows the connecting member 10 to move along the moving direction of the movable contact 4. Since the movable contact 4 disengages from the second mating end 14 of the first movable part 7 when the backup protection action occurs, the travel distance of the connecting member 10 is consistent with the travel distance of the second movable part 8 and its hinged end. The travel distance of the connecting member 10 is less than the travel distance of the movable contact 4. Therefore, the travel space reserved for the connecting member 10 in the disconnecting device 1 can be reduced, thereby reducing the volume of the backup protection disconnector and its space occupation in the surge protector.

[0037] In one alternative embodiment, the second mating ends 14 of the two first movable members 7 are enclosed to form a clamp-shaped structure, and the movable contact block 4 is provided with a lifting lug 6 at one end near the first movable member 7 along the moving direction, and the clamp-shaped structure can engage with the lifting lug 6.

[0038] In this scheme, the lifting lug 6 refers to any structure that can be engaged with the clamp-shaped structure upon closure. Specifically, the movable contact block 4 extends from the end near the first movable member 7 to form two structural members. The two structural members are spaced apart and are connected at the ends of the two structural members away from the movable contact block 4 to form a crossbeam 15. At this time, the two structural members, the crossbeam 15, and the end of the movable contact block 4 enclose to form a channel structure 17. The channel structure 17 has two channel openings. The second mating ends 14 of the two first movable members 7 extend into the channel structure 17 from the corresponding side channel openings, thereby allowing the clamp-shaped structure to extend between the end of the crossbeam 15 and the movable contact block 4, forming a blockage on the crossbeam 15 along the moving direction of the movable contact block 4, and thus blocking the movable contact block 4. The end face of the second mating end 14 of the first movable member 7 is inclined along the moving direction of the movable contact block 4. When the crossbeam 15 pushes the end face of the second mating end 14 along the moving direction of the movable contact block 4 under the action of the spring force, the thrust of the crossbeam 15 causes the first movable member 7 to rotate, thereby causing the clamp structure to separate and the crossbeam 15 to be completely disengaged from the notch of the clamp structure.

[0039] Example 2

[0040] The coil assembly 11 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 5 via a cable. The magnet assembly includes an iron core 12 and a permanent magnet 13. At least a portion of the iron core 12 passes through the sleeve. One end of the iron core 12 forms an abutment portion, and the other end opposite the abutment portion is located outside the sleeve and connected to the permanent magnet 13.

[0041] The iron core 12 passes through the cavity structure of the sleeve. One end of the iron core 12 forms an abutment part along the axial direction, and the other end is fixedly connected to the permanent magnet 13. The iron core 12 is magnetized by the permanent magnet 13 and can attract the connector 10 at one end of the abutment part under the action of magnetic force.

[0042] 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 5 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 of the iron core 12, thereby causing the disconnecting component to move under the action of the spring force, causing the connecting piece 10 to break free from the magnetic attraction constraint of the contact part and move. The disconnecting component is disengaged from the interval structure connected in series to the grounding circuit and separated from the two contacts 3 forming the interval structure, thereby disconnecting the grounding circuit of the backup protection device.

[0043] 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 5 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 of the iron core 12. Therefore, the connector 10 is magnetically attracted to the contact part, and the disconnecting component connected to the connector 10 also remains in contact with the two contacts 3 of the interval structure described above, thereby making the grounding circuit of the backup protection device conductive.

[0044] In one optional embodiment, the backup protection disconnector further includes a housing 2 with one end open, and permanent magnets 13 and iron cores 12 are arranged sequentially inside the housing 2 along the direction from the end opposite to the opening, and a seal is provided at the opening.

[0045] The housing 2 is fixed to the outer shell of the surge protector. The outer wall of the housing 2 is provided with a groove for fixing. The housing 2 is inserted into the outer shell of the surge protector through the groove on the outer wall, thereby fixing the position of the permanent magnet 13 and the iron core 12. The function of the sealing element is to make the permanent magnet 13 and the iron core 12 located inside the housing 2, forming a relatively independent integrated component. The abutting end of the iron core 12 is located at one end of the opening of the housing 2, and the other end of the iron core 12 and the permanent magnet 13 are located at the opposite end of the opening inside the housing 2. The sealing element is a glue seal or a rubber structure.

[0046] In one optional embodiment, the end face of the abutting end is flush with the end face of the housing 2 with an opening, the sealing element is located between the side wall surface of the iron core 12 near the abutting end and the inner wall surface of the housing 2 near the opening, and the connecting element 10 can simultaneously abut against the abutting end and the end face of the housing 2 with an opening.

[0047] Example 3

[0048] 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 an interval structure that can be connected in series to the grounding circuit. Two contacts 3 forming the interval structure can be electrically connected through a moving contact 4. The moving contact 4 is connected to a disconnecting component in the backup protection disconnector as described in Embodiment 1 or Embodiment 2. The disconnecting component can overcome the spring force of the moving contact 4, so that the moving contact 4 remains in contact with the two contacts 3.

[0049] 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.

[0050] 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 3 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 described in Embodiment 1 includes a conductive element. The function of the conductive element is to contact the two contacts 3 of the interval structure at the same time, thereby connecting the circuit structure in which the interval structure is located.

[0051] 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 5, which is 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 of the iron core 12. Therefore, the connector 10 is magnetically attracted to the contact part, and the conductive part of the disconnecting component connected to the connector 10 also remains in contact with the two contacts 3 described above, thereby ensuring that the backup protection device maintains circuit connection with the grounding circuit.

[0052] 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 5, which is 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 of the iron core 12, thereby causing the disconnecting component to move under the elastic force of the spring, causing the connecting piece 10 to break free from the magnetic attraction constraint of the contact part. The conductive part of the disconnecting component is released from the spacer structure and separated from the two contacts 3, 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.

[0053] It should be noted that any of the above embodiments are illustrative of the invention and not restrictive, 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 invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several 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 can be interpreted as names.

[0054] The above embodiments are only suitable for illustrating the present invention and are not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention, and the patent protection scope of the present invention should be defined by the claims.

Claims

1. A backup protection disconnector, characterized in that, It includes a magnet assembly, a coil assembly (11) and a disconnecting device (1). One end of the magnet assembly has an abutment portion. The coil assembly (11) is sleeved on the outside of the magnet assembly. The abutment portion abuts against the disconnecting device (1) by the magnetic force of the magnet assembly. The coil assembly (11) is electrically connected to a current transformer (5) that is matched with the grounding circuit of the surge protector.

2. The backup protection disconnector according to claim 1, characterized in that, The abutting part abuts against the connector (10) by magnetic force, and the connector (10) can move and cooperate with the disconnecting device (1).

3. The backup protection disconnector according to claim 2, characterized in that, The disconnecting device (1) includes a first movable member (7) and a second movable member (8). One end of the second movable member (8) is hinged to the connecting member (10), and the other end is hinged to the first mating end (16) of the first movable member (7). The second mating end (14) of the first movable member (7) abuts against the movable contact block (4) along the moving direction of the movable contact block (4). The movable contact block (4) can push the first movable member (7) to rotate around the pivot (9) located between the first mating end (16) and the second mating end (14) along the moving direction until it disengages from the movable contact block (4).

4. The backup protection disconnector according to claim 3, characterized in that, The disconnecting device (1) includes two symmetrically arranged movable components, each of which includes a first movable element (7) and a second movable element (8).

5. The backup protection disconnector according to claim 2, characterized in that, The coil assembly (11) 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 (5) via a cable.

6. The backup protection disconnector according to claim 5, characterized in that, The magnet assembly includes an iron core (12) and a permanent magnet (13). At least a portion of the iron core (12) passes through the sleeve. One end of the iron core (12) forms the abutment portion, and the other end opposite to the abutment portion is located outside the sleeve and connected to the permanent magnet (13).

7. The backup protection disconnector according to claim 6, characterized in that, The backup protection disconnector also includes a housing (2) with one end open. The permanent magnet (13) and the iron core (12) are arranged sequentially in the housing (2) along the direction from the end opposite to the opening. A seal is provided at the opening.

8. The backup protection disconnector according to claim 4, characterized in that, The second mating ends (14) of the two first movable parts (7) are enclosed to form a clamp-shaped structure. The movable contact block (4) is provided with a lifting lug (6) at one end near the first movable part (7) along the moving direction. The clamp-shaped structure can engage with the lifting lug (6).

9. The backup protection disconnector according to claim 7, characterized in that, The end face of the abutting end is flush with the end face of the housing (2) where the opening is provided. The sealing member is located between the side wall of the iron core (12) near the abutting end and the inner wall of the housing (2) near the opening. The connecting member (10) can simultaneously abut against the abutting end and the end face of the housing (2) where the opening is provided.

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 (3) forming the interval structure can be electrically connected through a moving contact (4). The moving contact (4) is connected to a disconnecting component in the backup protection disconnector as described in any one of claims 1-9. The disconnecting component can overcome the spring force of the moving contact (4) so ​​that the moving contact (4) remains in contact with the two contacts (3).

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