Backup protection breaker and surge protector

Abstract

The utility model relates to the field of surge protector equipment, in particular to a backup protection breaker and a surge protector. The backup protection breaker provided by the utility model comprises a magnet assembly, a coil assembly and a breaking 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 breaking device through the magnetic force of the magnet assembly, and the breaking device is connected with the coil 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] The utility model relates to surge protector equipment field especially a kind of backup protection disconnector and surge protector. BACKGROUND

[0002] To realize the initiative disconnection function of backup protection disconnector of surge protector, current transformer is arranged on the main circuit where lightning protection element of surge protector is located, electromagnetic release is controlled to act through current transformer, the action side of electromagnetic release is cooperated with movable contact block of interval structure arranged on grounding circuit through linkage mechanism, the action side of electromagnetic release makes movable contact block move to be separated from grounding circuit through linkage mechanism, so that grounding circuit is disconnected.Electromagnetic release as a relatively independent integrated piece and linkage mechanism occupy larger space in surge protector, which is not conducive to product miniaturization. SUMMARY

[0003] On the one hand, the utility model provides a kind of backup protection disconnector, which can reduce the space occupied by the structure realizing initiative disconnection function in surge protector, so as to facilitate the miniaturization of product;

[0004] The backup protection disconnector provided by the utility model includes a magnet assembly, a coil assembly and a disconnection device, one end of the magnet assembly has an abutting portion, the coil assembly is sleeved outside the magnet assembly, the abutting portion is abutted with the disconnection device by the magnetic force of the magnet assembly, and the coil assembly is electrically connected with the current transformer matched on the grounding circuit of the surge protector.

[0005] Further, the abutting portion is abutted with the connecting piece by magnetic force, and the connecting piece can be movably matched with the disconnection device.

[0006] Further, the disconnection device includes a first movable piece and a second movable piece, one end of the second movable piece is hinged with the connecting piece, the other end is hinged with the first matching end of the first movable piece, the second matching end of the first movable piece is abutted with the movable contact block along the moving direction of the movable contact block, and the movable contact block can push the first movable piece to rotate around the rotating shaft between the first matching end and the second matching end to be separated from the movable contact block along the moving direction.

[0007] Further, the disconnection device includes two symmetrically arranged movable assemblies, and each movable assembly includes a first movable piece and a second movable piece.

[0008] Further, the coil assembly includes a sleeve and a coil wound on the outer wall of the sleeve, and the coil is connected with the secondary side of the current transformer through a cable.

[0009] Further, the magnet assembly comprises a core and a permanent magnet, at least a part of the core passes through the sleeve, one end of the core forms the abutting portion, and the other end opposite to the abutting portion is located outside the sleeve and connected with the permanent magnet.

[0010] Further, the backup protection disconnector further comprises a shell with one end being open, the permanent magnet and the core are sequentially arranged in the shell in a direction from the end opposite to the opening to the opening, and a sealing element is arranged at the opening.

[0011] Further, the second matching ends of the two first movable members form a pincer structure, the moving contact block is provided with a lug at one end close to the first movable member in the moving direction, and the pincer structure can be clamped with the lug.

[0012] Further, the end face of the abutting portion is flush with the end face of the one end of the shell provided with the opening, the sealing element is located between the side wall face of the core close to the abutting portion and the inner wall face of the shell close to the opening, and the connecting element can abut against the abutting portion and the end face of the one end of the shell provided with the opening at the same time.

[0013] On the other hand, the surge protector provided by the utility model comprises a lightning protection module and a backup protection module which are connected in series to a grounding circuit, the backup protection module comprises a spacing structure which can be connected in series to the grounding circuit, the two contacts forming the spacing structure can be electrically connected through a moving contact block, the moving contact block is connected with the disconnection assembly in the backup protection disconnector according to any one of the above, and the disconnection assembly can overcome the elastic force of the spring of the moving contact block, so that the moving contact block keeps in contact with the two contacts.

[0014] Advantageous effects

[0015] In the scheme, the coil assembly of the backup protection disconnector is sleeved outside the magnet assembly, that is, the scheme can utilize the cavity structure of the existing coil assembly, completely place the magnet assembly in the cavity structure, or only keep the abutting portion extending out, so as to abut against the disconnection assembly, at this time, the profile volume of the backup protection disconnector is only slightly larger than the profile volume of the coil assembly, the profile volume of the part of the magnet assembly located outside the coil assembly can be ignored, and thus the volume of the backup protection disconnector can be reduced, thereby reducing the space occupation of the backup protection disconnector in the surge protector. BRIEF DESCRIPTION OF DRAWINGS

[0016] 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.

[0017] Fig. 1 This is a schematic diagram of the overall structure of the backup protection disconnector provided in Embodiments 1 to 3 of this utility model;

[0018] Fig. 2 These are schematic diagrams of the breaking device provided in Embodiments 1 to 3 of this utility model;

[0019] Fig. 3 This is a cross-sectional schematic diagram of the magnet assembly, coil assembly, and disconnection device provided in Embodiments 1 to 3 of this utility model.

[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 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.

[0022] Example 1

[0023] like Figs. 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] In order to reduce the volume of the backup protection disconnector and reduce the space occupation in the surge protector, the coil assembly 11 of the backup protection disconnector in the scheme is sleeved outside the magnet assembly, the magnet assembly is resisted by the magnetic force and the disconnection assembly, so as to fix the disconnection assembly, so that the grounding circuit of the backup protection device can keep conduction, the coil assembly 11 generates a magnetic field when the secondary side current generated by the current transformer 5 flows, the magnetic field can offset or partially offset the magnetic force of the magnet assembly, so that the disconnection assembly is released from the constraint of the magnet assembly, thereby moving and disconnecting the grounding circuit of the backup protection device.

[0025] That is, by using the existing cavity structure of the coil assembly 11, the magnet assembly can be completely placed in the cavity structure, or only the abutting portion is left out to abut with the disconnection assembly. At this time, the profile volume of the backup protection disconnector is only slightly larger than the profile volume of the coil assembly 11, and the profile volume of the part of the magnet assembly outside the coil assembly 11 can be ignored, so that the volume of the backup protection disconnector can be reduced, thereby reducing the space occupation in the surge protector.

[0026] In an optional embodiment, the abutting portion is resisted by the magnetic force and the connecting piece 10 can be movably connected with the disconnection device 1.

[0027] The connecting piece 10 can be acted on by the magnetic force of the abutting portion, and the connecting piece 10 is movably connected with the disconnection assembly, such as rotary connection, ball joint connection or flexible connection through a flexible structure, so that the backup protection disconnector has a certain connection error redundancy when connected with the disconnection assembly, or the disconnection assembly changes the angle when moving, and the connecting piece 10 can keep the original angle and does not rotate with it.

[0028] The main function of the connecting piece 10 in the scheme is to enable the disconnection assembly of other materials to be connected with the backup protection disconnector by magnetic force, so that the magnet assembly can only have the most basic magnetic force structure, so that the magnetic force assembly has a smaller volume and is placed in the cavity structure of the coil assembly 11.

[0029] In an optional embodiment, the disconnection device 1 includes a first movable piece 7 and a second movable piece 8, one end of the second movable piece 8 is hinged to the connecting piece 10, the other end is hinged to the first connecting end 16 of the first movable piece 7, the second connecting end 14 of the first movable piece 7 is resisted by the moving direction of the moving contact 4, and the moving contact 4 can push the first movable piece 7 to rotate around the rotating shaft 9 between the first connecting end 16 and the second connecting end 14 to be separated from the moving contact 4.

[0030] The first movable member 7 and the second movable member 8 constitute a linkage system, wherein the first movable member 7 is provided with a rotating shaft 9, the length between the rotating shaft 9 and the second matching end 14 is smaller than the length between the rotating shaft 9 and the first matching end 16, thus the smaller magnetic force provided by the magnet assembly can overcome the spring force of the larger moving contact block 4 by using the first movable member 7, so as to reduce the setting specifications of the magnet assembly and the coil assembly 11, and further to reduce the size of the magnet assembly and the coil assembly 11.

[0031] One end of the second movable member 8 is hinged with the connecting member 10, and the other end is hinged with the first matching end 16 of the first movable member 7, and the second movable member 8 is used to cooperate with the first movable member 7 to rotate, so that the moving direction of the connecting member 10 is consistent with that of the moving contact block 4, specifically, when the magnet assembly loses the restraining effect on the moving contact block 4, the moving contact block 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 with the second movable member 8, and the two can rotate relative to each other, and the second movable member 8 is hinged with the connecting member 10, and the two can also rotate relative to each other, thus the second movable member 8 can move through the reverse rotation compared with the first movable member 7, and finally the connecting member 10 can move along the moving direction of the moving contact block 4.

[0032] Preferably, the disconnecting device 1 comprises two symmetrically arranged movable assemblies, each movable assembly comprising a first movable member 7 and a second movable member 8.

[0033] The two first movable members 7 of the two movable assemblies are opposite to each other and clamp the moving contact block 4, or form a restraining end surface to the moving contact block 4 along its moving direction, so that the moving contact block 4 cannot move under the action of the spring force.

[0034] The two first movable members 7 are connected with the same rotating shaft 9.

[0035] The two second movable members 8 are connected with the same hinge point on the connecting member 10.

[0036] When the moving contact block 4 moves under the action of the spring and pushes the two first movable members 7 to rotate in opposite directions around the rotating shaft 9, the first movable members 7 drive the second movable members 8 hinged therewith to rotate, thus the two second movable members 8 also rotate in opposite directions, and the combined movement of the two second movable members 8 at the hinge point of the connecting member 10 enables the connecting member 10 to move along the moving direction of the moving contact block 4. Since the moving contact block 4 is separated from the second matching end 14 of the first movable member 7 when the backup protection action occurs, the moving stroke of the connecting member 10 is consistent with that of the end of the second movable member 8 hinged therewith, and the moving stroke of the connecting member 10 is smaller than that of the moving contact block 4, thus the moving space reserved for the connecting member 10 in the disconnecting device 1 can be reduced, and the volume of the backup protection disconnector can be further reduced, and the space occupation in the surge protector can be reduced.

[0037] In an alternative embodiment, the second engaging ends 14 of the two first movable members 7 form a pincer structure, and the end of the movable contact 4 close to the first movable member 7 is provided with a lug 6, and the pincer structure is capable of being clamped with the lug 6.

[0038] The lug 6 in the present scheme refers to any structure capable of being clamped with the closing of the pincer structure. Specifically, the end of the movable contact 4 close to the first movable member 7 extends to form two structural members, the two structural members are arranged at intervals, and the ends of the two structural members away from the movable contact 4 are connected to form a crossbeam 15. At this time, the two structural members, the crossbeam 15 and the end of the movable contact 4 form a channel structure 17, and the channel structure 17 has two channel openings respectively. The second engaging ends 14 of the two first movable members 7 respectively extend into the channel structure 17 through the corresponding channel openings, so that the pincer structure extends between the crossbeam 15 and the end of the movable contact 4, and the crossbeam 15 is blocked in the moving direction of the movable contact 4, thereby forming a block to the movable contact 4. The end surface of the second engaging end 14 of the first movable member 7 is arranged obliquely in the moving direction of the movable contact 4. When the crossbeam 15 pushes the end surface of the second engaging end 14 in the moving direction of the movable contact 4 under the elastic force of the spring, the pushing force of the crossbeam 15 causes the first movable member 7 to rotate, so that the pincer structure is separated, and the crossbeam 15 can be completely separated from the gap of the pincer structure.

[0039] Embodiment two

[0040] The coil assembly 11 includes a sleeve and a coil wound on the outer wall of the sleeve, and the coil is connected to the secondary side of the current transformer 5 through a cable. The magnet assembly includes an iron core 12 and a permanent magnet 13. At least a part of the iron core 12 passes through the sleeve, and one end of the iron core 12 forms an abutting portion, and the other end opposite to the abutting portion is located outside the sleeve and connected with the permanent magnet 13.

[0041] The iron core 12 passes through the cavity structure of the sleeve, and one end of the iron core 12 in the axial direction forms an abutting portion, and the other end is fixedly connected with the permanent magnet 13. The iron core 12 is magnetized by the permanent magnet 13, and can be attracted to the connecting piece 10 at the abutting portion end under the magnetic force.

[0042] When the ground circuit of the surge protector flows the power frequency current capable of triggering the backup protection, the current generated on the secondary side of the current transformer 5 sleeved on the ground circuit can make the coil generate a magnetic field, which can offset or partially offset the magnetic force at the abutting portion of the iron core 12, so that the disconnecting assembly drives the connecting piece 10 to get rid of the magnetic attraction constraint of the abutting portion under the elastic force of the spring and further moves, and the disconnecting assembly is separated from the two contacts 3 forming the interval structure and is separated from the interval structure connected in series to the ground circuit, so that the ground circuit of the backup protection device is disconnected.

[0043] When the power frequency current flowing through the grounding circuit of the surge protector fails to reach the threshold value of triggering the backup protection, the current generated by the secondary side of the current transformer 5 wrapped around the grounding circuit cannot generate a magnetic field strong enough to offset or partially offset the magnetic field at the abutting portion of the core 12, so the connecting piece 10 is magnetically attracted to the abutting portion, and the disconnecting assembly connected to the connecting piece 10 also remains in contact with the two contacts 3 of the spacing structure described above, thereby making the grounding circuit of the backup protection device conductive.

[0044] In an optional embodiment, the backup protection disconnecting device further comprises an open-ended housing 2, and the permanent magnet 13 and the core 12 are arranged in the housing 2 in sequence from the end opposite to the opening to the opening. The opening is provided with a sealing member.

[0045] The housing 2 is fixed between the shell of the surge protector, and the outer wall surface of the housing 2 is provided with a groove for fixation. The housing 2 is embedded into the shell of the surge protector through the groove on the outer wall surface, thereby fixing the positions of the permanent magnet 13 and the core 12. The sealing member serves to make the permanent magnet 13 and the core 12 form a relatively independent integrated component in the housing 2. The abutting portion of the core 12 is located at the opening end of the housing 2, and the other end of the core 12 and the permanent magnet 13 are located at the end opposite to the opening of the housing 2. The sealing member is a glue seal or a rubber structure.

[0046] In an optional embodiment, the end face of the abutting portion is flush with the end face of the end provided with the opening of the housing 2. The sealing member is located between the side wall surface of the core 12 close to the abutting portion and the inner wall surface of the housing 2 close to the opening. The connecting piece 10 can abut against the abutting portion and the end face of the end provided with the opening of the housing 2 at the same time.

[0047] Embodiment Three

[0048] A surge protector comprises a lightning protection module and a backup protection module connected in series to a grounding circuit. The backup protection module comprises a spacing structure capable of being connected in series to the grounding circuit, and two contacts 3 formed by the spacing structure are electrically connected through a movable contact block 4. The movable contact block 4 is connected to a disconnecting assembly in the backup protection disconnecting device as described in Embodiment One or Embodiment Two. The disconnecting assembly can overcome the elastic force of the spring of the movable contact block 4 to make the movable contact block 4 remain in contact with the two contacts 3.

[0049] The lightning protection module of the surge protector is provided with a lightning protection element, i.e., a voltage-dependent resistor, and a thermal trip assembly. The lightning protection element and the thermal trip assembly are connected in series to the circuit structure of the grounding circuit in 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 an external grounding cable, the lightning protection element can be connected to the grounding circuit, and the specific function of the thermal trip assembly is consistent with that of the existing surge protector.

[0050] The backup protection module is provided with a spacing structure, that is, the circuit structure in the backup protection module is disconnected to form the spacing structure, and two contacts 3 are arranged on two sides of the spacing structure. After the backup protection module is matched with the base of the surge protector, the spacing structure is connected to the grounding circuit together with the circuit structure in the backup protection module, that is, the spacing structure, the lightning protection element and the thermal trip assembly are connected in series in the grounding circuit in the surge protector. The disconnecting assembly in the first embodiment includes a conductive part, which is used to contact the two contacts 3 at the same time, so as to connect the circuit structure in which the spacing structure is arranged.

[0051] When the power frequency current flowing through the grounding circuit of the surge protector fails to reach the threshold value for triggering the backup protection, the current generated by the secondary side of the current transformer 5 sleeved on the circuit structure in the backup protection module cannot generate a magnetic field strong enough to offset or partially offset the magnetic field at the abutting portion of the iron core 12, so the connecting part 10 is magnetically attracted to abut against the abutting portion, and the conductive part of the disconnecting assembly connected to the connecting part 10 also keeps contacting the two contacts 3, so that the backup protection device also keeps connected to the grounding circuit.

[0052] When the power frequency current flowing through the grounding circuit of the surge protector can trigger the backup protection, the current generated by the secondary side of the current transformer 5 sleeved on the circuit structure in the backup protection module can generate a magnetic field, which can offset or partially offset the magnetic field at the abutting portion of the iron core 12, so that the disconnecting assembly is driven by the elastic force of the spring to move away from the magnetic attraction of the abutting portion and further move, the conductive part of the disconnecting assembly is separated from the two contacts 3, so that the grounding circuit of the backup protection device is disconnected, the lightning protection module is disconnected from the grounding circuit, and the lightning protection module is protected.

[0053] It should be noted that any of the above embodiments is used to illustrate the present application rather than limit the present application, and a person skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol located between parentheses should not be construed as a limitation of the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" before an element does not exclude the presence of multiple such elements. The present application can be implemented by means of hardware including a plurality of different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means can be embodied by one and the same item of hardware. The use of the words first, second and the like does not indicate any order. These words can be interpreted as names.

[0054] The above embodiments are only suitable for illustrating the utility model, and are not a limitation on the utility model, and an ordinary skilled person in the relevant art can make various changes and modifications without departing from the spirit and scope of the utility model, therefore, all equivalent technical solutions also belong to the scope of the utility model, and the patent protection scope of the utility model should be defined by the claims.

Claims

1. A backup protection disconnector, characterized in that, The application relates to a backup protection disconnector, which comprises a magnet assembly, a coil assembly (11) and a disconnection device (1), one end of the magnet assembly is provided with an abutting part, the coil assembly (11) is sleeved outside the magnet assembly, the abutting part is abutted against the disconnection device (1) through the magnetic force of the magnet assembly, and the coil assembly (11) is electrically connected with a current transformer (5) matched on a grounding circuit of a surge protector.

2. Backup protection circuit breaker according to claim 1, characterized in that The abutting part is abutted against a connecting piece (10), and the connecting piece (10) can be movably matched with the disconnection device (1).

3. Backup protection circuit breaker according to claim 2, characterized in that The disconnection device (1) comprises a first movable piece (7) and a second movable piece (8), one end of the second movable piece (8) is hinged to the connecting piece (10), the other end is hinged to a first matching end (16) of the first movable piece (7), a second matching end (14) of the first movable piece (7) is abutted against a moving contact block (4) along the moving direction of the moving contact block (4), and the moving contact block (4) can push the first movable piece (7) to rotate around a rotating shaft (9) between the first matching end (16) and the second matching end (14) to be separated from the moving contact block (4) along the moving direction.

4. Backup protection circuit breaker according to claim 3, characterized in that The disconnection device (1) comprises two symmetrically arranged movable assemblies, each movable assembly comprises one first movable piece (7) and one second movable piece (8).

5. The backup protection circuit breaker of claim 2, wherein, The coil assembly (11) comprises a sleeve and a coil wound on the outer wall of the sleeve, and the coil is connected with the secondary side of the current transformer (5) through a cable.

6. Backup protection circuit breaker according to claim 5, characterized in that The magnet assembly comprises an iron core (12) and a permanent magnet (13), at least a part of the iron core (12) penetrates through the sleeve, one end of the iron core (12) forms the abutting part, and the other end opposite to the abutting part is located outside the sleeve and connected with the permanent magnet (13).

7. Backup protection circuit breaker according to claim 6, characterized in that The backup protection disconnector further comprises a shell (2) with an open end, in the direction from the end opposite to the open end to the open end, the permanent magnet (13) and the iron core (12) are arranged in the shell (2) in sequence, and a sealing piece is arranged at the open end.

8. The backup protection circuit breaker of claim 4, wherein, The second matching ends (14) of the two first movable pieces (7) form a pincer structure, the moving contact block (4) is provided with a lug (6) at one end close to the first movable pieces (7) along the moving direction, and the pincer structure can be clamped with the lug (6).

9. The backup protection circuit breaker of claim 7, wherein, The end face of the abutting part is flush with the end face of the shell (2) provided with the open end, the sealing piece is located between the side wall face of the iron core (12) close to the abutting part and the inner wall face of the shell (2) close to the open end, and the connecting piece (10) can be abutted against the abutting part and the end face of the shell (2) provided with the open end at the same time.

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 comprises a spacer structure capable of being connected in series to a grounding circuit, an electric connection between two contacts (3) forming the spacer structure being capable of being made by means of a movable contact block (4) connected to a disconnection assembly as claimed in any one of claims 1 to 9, the disconnection assembly being capable of overcoming the elastic force of a spring of the movable contact block (4) so that the movable contact block (4) remains in contact with the two contacts (3).

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