A residual current operated circuit breaker

Abstract

The application discloses a residual current circuit breaker, and relates to the field of circuit breakers, which comprises a partition frame, the partition frame comprising a residual current protection side and an overcurrent protection side, the residual current protection side being provided with a first static contact plate and a first dynamic contact plate, the residual current protection side being further provided with a relay and a first linkage mechanism, the relay driving the first dynamic contact plate to move away from the first static contact plate through the first linkage mechanism; the overcurrent protection side being provided with a second static contact plate and a second dynamic contact plate, the overcurrent protection side being further provided with an electromagnetic release, a transmission support and a second linkage mechanism, the electromagnetic release being transmissionally connected to the second linkage mechanism through the transmission support, and the second linkage mechanism being transmissionally connected to the second dynamic contact plate; the partition frame being further provided with a synchronization structure, the synchronization structure being transmissionally connected to the first dynamic contact plate and the transmission support. The application has the effect of realizing the synchronous opening of the circuit breaker on the zero line and the fire line when the zero line residual current is abnormal.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of circuit breakers, in particular to a residual current circuit breaker. BACKGROUND

[0002] The residual current circuit breaker is a low-voltage electrical terminal device containing overcurrent protection and residual current protection, which can protect electrical equipment and personal safety.

[0003] In the related art, the residual current circuit breaker generally includes two side circuit breaking structures, one of which is a residual current protection structure, and the other is an overcurrent protection structure. In actual use, if a residual current is generated in the zero line of the power line, the residual current protection structure operates, and the zero sequence transformer in the residual current circuit breaker senses the size of the residual current in the line. When the residual current reaches the rated value of the relay action, the relay electromagnetic coil is triggered through the line board, and the moving iron core of the electromagnetic coil drives the ejector rod to push the tripping part, so that the residual current protection structure part of the circuit breaker is tripped and disconnected. The zero line of the power circuit is disconnected. When the fire line overcurrent in the power line, the overcurrent protection structure operates, and the electromagnetic release is triggered through the line board, and the moving iron core of the electromagnetic release drives the ejector rod to push the corresponding tripping part, so that the overcurrent protection structure of the circuit breaker is tripped and disconnected. The fire line of the power circuit is disconnected.

[0004] However, when the residual current protection structure is tripped, only the zero line is disconnected, and when the fire line is still live and there is a great safety hazard during maintenance, there is room for improvement. SUMMARY

[0005] In order to improve the problem that the residual current protection structure of the circuit breaker in the related art is tripped and only the zero line is disconnected, and there is still a great safety hazard during maintenance, the present application provides a residual current circuit breaker.

[0006] The residual current circuit breaker provided by the present application adopts the following technical scheme:

[0007] A residual current circuit breaker, comprising a partition frame, opposite sides of the partition frame are respectively a residual current protection side and an overcurrent protection side, the residual current protection side is provided with a first static contact plate and a first dynamic contact plate which are opposite to each other, the first static contact plate is fixed on the residual current protection side, and the first dynamic contact plate is movably arranged on the residual current protection side, the residual current protection side is further provided with a relay and a first linkage mechanism, and the relay drives the first dynamic contact plate to move away from the first static contact plate through the first linkage mechanism.

[0008] The overcurrent protection side is provided with a second static contact plate and a second dynamic contact plate which are opposite to each other, the second static contact plate is fixed to the overcurrent protection side, and the second dynamic contact plate is movably arranged on the overcurrent protection side; and the overcurrent protection side is further provided with an electromagnetic release and a second linkage mechanism;

[0009] The residual current protection side is further provided with a swing bracket, the middle part of the swing bracket is rotationally connected to the residual current protection side, one side of the swing bracket in the length direction is close to the first dynamic contact plate, and the other side of the swing bracket is fixed with a linkage rod;

[0010] When the first dynamic contact plate moves away from the first static contact plate and is opened, the first dynamic contact plate abuts against the swing bracket and drives the swing bracket to rotate;

[0011] The overcurrent protection side is provided with a transmission bracket between the electromagnetic release and the second linkage mechanism, the middle part of the transmission bracket is rotationally connected to the overcurrent protection side, the rotation axis of the transmission bracket is collinear with the rotation axis of the swing bracket, the two sides of the transmission bracket in the length direction are respectively transmissionally connected to the electromagnetic release and the second linkage mechanism, and the second linkage mechanism is transmissionally connected to the second dynamic contact plate and drives the second dynamic contact plate to move away from the second static contact plate;

[0012] Further, the partition frame is provided with an avoiding hole which penetrates the residual current protection side and the overcurrent protection side, and one end of the linkage rod away from the swing bracket penetrates the avoiding hole and is fixed to one side of the transmission bracket close to the electromagnetic release.

[0013] By adopting the above technical scheme, when the residual current of the zero line reaches the rated value of the relay action, the relay drives the first dynamic contact plate to move away from the first static contact plate through the first linkage mechanism, and the first dynamic contact plate and the first static contact plate are transformed from the closed state to the open state; at the same time, the first dynamic contact plate will touch the swing bracket, the swing bracket will swing, and the swing bracket will touch the transmission bracket through the linkage rod; at this time, the transmission bracket will drive the second dynamic contact plate to move away from the second static contact plate through the second linkage mechanism, and the second dynamic contact plate and the second static contact plate are transformed from the closed state to the open state. In this way, under the condition that the residual current of the zero line exceeds the rated value of the relay action, the synchronous opening of the circuit breaker to the zero line and the fire line is realized, the situation of electric shock of the maintenance personnel is reduced, the security risk is reduced, and the safety is improved.

[0014] Preferably, the middle part of the first dynamic contact plate is provided with a first waist-shaped hole, the length direction of the first waist-shaped hole is perpendicular to the length direction of the first dynamic contact plate, the residual current protection side is fixed with a first base column, the first base column penetrates the first waist-shaped hole, one side of the first dynamic contact plate in the length direction abuts against the first static contact plate, and one end of the first dynamic contact plate away from the first static contact plate is provided with a second waist-shaped hole;

[0015] The first linkage mechanism comprises a first rotating block, a first linkage support, and a first U-shaped rod. The middle part of the first rotating block is rotationally connected to the residual current protection side. One side of the first rotating block is formed with a first limiting block. The partition frame is provided with a first limiting slot. The first limiting slot is arc-shaped and is arranged around the first rotating block. One end of the first limiting slot is close to the first moving contact plate. The other end of the first limiting slot extends away from the first moving contact plate. The first limiting block penetrates into the first limiting slot. The middle part of the first linkage support is hingedly connected to the edge position of the first rotating block. The first U-shaped rod comprises two first pull rods which are parallel to each other. One of the first pull rods penetrates through the side of the first linkage support away from the first rotating block. The other first pull rod penetrates through the second waist-shaped hole.

[0016] In the closed state, the length direction of the first linkage support intersects the length direction of the first moving contact plate, and the included angle between the length direction of the first linkage support and the length direction of the first moving contact plate is not less than 90 degrees and less than 180 degrees. The connecting line between the two first pull rods is parallel to the length direction of the first linkage support. The axis of the first rotating block is located on the inner side of the included angle between the first linkage support and the first moving contact plate. The hinged point of the first linkage support on the first rotating block is located on the side of the first rotating block close to the first moving contact plate. The first limiting block abuts against the side wall of the first limiting slot away from the first moving contact plate. The side of the first linkage support away from the first rotating block is formed with a first abutting surface. The first abutting surface is located on the outer side of the included angle between the first linkage support and the first moving contact plate and faces the inner side of the included angle. The first pull rod penetrating through the second waist-shaped hole abuts against the first abutting surface.

[0017] The residual current protection side is fixedly provided with a first fixed column. The first fixed column is located on the inner side of the included angle between the first linkage support and the first moving contact plate. The first linkage mechanism further comprises a first tension spring and a second tension spring. One end of the first tension spring is hooked to the first fixed column. The other end of the first tension spring is hooked to the part of the first moving contact plate between the first waist-shaped hole and the second waist-shaped hole. One end of the second tension spring is hooked to the first fixed column. The other end of the second tension spring is hooked to the side of the first linkage support on the first rotating block. The elastic coefficient of the first tension spring is greater than the elastic coefficient of the second tension spring.

[0018] By adopting the technical scheme, in the closed state, the first rotating block axis is arranged on the inner side of the included angle between the first linkage support and the first moving contact plate, the hinge point of the first linkage support on the first rotating block is located on the side of the first rotating block close to the first moving contact plate, the first limiting block abuts against the side wall of the first limiting groove away from the first moving contact plate, the first rotating block will be in a relatively stable state, meanwhile, the included angle between the first linkage support and the first moving contact plate is greater than 90 degrees, the line between the two first pull rods is parallel to the first linkage support, the first pull rod penetrating the second waist-shaped hole abuts against the first abutting surface, the first moving contact plate is pulled by the first tension spring to be located between the first waist-shaped hole and the second waist-shaped hole, and the first moving contact plate will press the first U-shaped rod and the first linkage support, so that the first linkage mechanism and the first moving contact plate are in a dead point state, thereby helping to ensure the stability of the circuit breaker in the closed state.

[0019] Preferably, the first linkage mechanism further comprises a second tension spring, one end of the second tension spring is hooked to the first fixed column, the other end of the second tension spring is hooked to the first linkage support on one side of the first rotating block, and the elastic coefficient of the first tension spring is greater than that of the second tension spring.

[0020] By adopting the technical scheme, the first rotating block is rotationally connected to the residual current protection side, the first linkage support is hingedly connected to the first rotating block, the two first pull rods are respectively provided through the first linkage support and the first moving contact plate, and the second tension spring gives the first linkage support a pulling force to move to the side of the first fixed column, when the side of the first linkage support close to the first moving contact plate rotates outward, the second tension spring can timely pull the first rotating block to rotate through the first linkage support, so that the dead point state formed by the first linkage mechanism and the first moving contact plate is relatively easy to be broken, thereby helping to ensure the timeliness of the circuit breaker in opening when there is a problem in the circuit.

[0021] Preferably, the residual current protection side is further hingedly connected with a driving support, one end of the driving support in the length direction is close to the relay ejector rod, and the side of the driving support in the length direction away from the relay is close to the side of the first linkage support away from the first rotating block.

[0022] When opening, the relay ejector rod pushes the driving support to rotate, and the driving support abuts against the first linkage support on the inner side of the included angle between the first linkage support and the first moving contact plate and drives the first linkage support to rotate.

[0023] By adopting the technical scheme, when the gate is opened, the relay pushes the driving support to rotate, and the first linkage support is driven to swing by the driving support, so as to break the dead point state between the first linkage mechanism and the first movable contact plate; at this time, the second tension spring moves the first linkage support to the side of the first fixed column, and pulls the first rotating block to rotate to the side of the first fixed column, then the second tension spring indirectly pulls the first movable contact plate to move to the side of the first fixed column, the first tension spring directly pulls the first movable contact plate to move to the side of the first fixed column, and the first movable contact plate is away from the first static contact plate, and the opening of the residual current protection side is completed, so that the first linkage mechanism dead point is released, which helps to ensure the timeliness of the circuit breaker when the circuit breaker opens the gate in case of problems in the circuit.

[0024] Preferably, the residual current protection side is further fixed with a supporting rod, the supporting rod is arranged through the driving support, and the driving support is hinged to the residual current protection side through the supporting rod.

[0025] A first torsional spring is arranged on the supporting rod and used to drive the driving support to twist to the side of the relay.

[0026] By adopting the technical scheme, after the gate is opened, the relay retracts the jacking rod, and under the torsional force of the first torsional spring, the driving support will return to the initial position, so as to prevent the driving support from blocking the normal closing of the circuit breaker, and help the subsequent normal opening of the circuit breaker.

[0027] Preferably, the second linkage mechanism comprises a second rotating block, the second rotating block is rotationally connected to the overcurrent protection side, the rotation axis of the second rotating block is collinear with the rotation axis of the first rotating block, and a second limiting block is formed on one side of the second rotating block.

[0028] A second limiting groove is formed on the partition frame along the first limiting groove, the second limiting block penetrates into the second limiting groove, the first limiting groove and the second limiting groove are through, and the first limiting block and the second limiting block are fixedly connected through the through part of the first limiting groove and the second limiting groove.

[0029] By adopting the technical scheme, the first limiting block and the second limiting block are connected by the synchronous support, which further ensures the normal opening of the circuit breaker to the zero line and the live line.

[0030] Preferably, the first limiting groove and the second limiting groove are both through the outside, the first limiting block is exposed to the outside through the first limiting groove, the second limiting block is exposed to the outside through the second limiting groove, and the synchronous support is located outside the partition frame.

[0031] By adopting the technical scheme, the synchronous support is arranged on the outside of the partition frame, which helps to facilitate the maintenance personnel to judge the opening and closing state of the circuit breaker, and helps to facilitate the closing of the circuit breaker by the staff.

[0032] Preferably, the over-current protection side is provided with an intermediate swing frame, one side of the intermediate swing frame away from the rotation axis is in transmission connection with the second linkage mechanism, one side of the intermediate swing frame is provided with a bimetallic strip, the bimetallic strip is in series on the live wire, one end of the bimetallic strip is fixed to the over-current protection side, the other end of the bimetallic strip is close to the intermediate swing frame, and the bimetallic strip comprises a high-expansion-coefficient layer and a low-expansion-coefficient layer, and the low-expansion-coefficient layer is located on the side close to the intermediate swing frame.

[0033] When the bimetallic strip is heated and bends to the side of the intermediate swing frame, the bimetallic strip will abut against the intermediate swing frame and push the intermediate swing frame to rotate, thereby driving the second linkage mechanism to move so that the second moving contact plate is away from the first stationary contact plate.

[0034] By adopting the above technical scheme, when the live wire current exceeds the rated current of the electrical equipment for a short time but is less than the trigger current of the electromagnetic release, it belongs to the normal fluctuation of the live wire current, but when the live wire current exceeds the rated current of the electrical equipment for a long time but is less than the trigger current of the electromagnetic release, it belongs to the abnormal phenomenon of the current, at this time, the bimetallic strip will be heated and bend to the side of the intermediate swing frame, the bimetallic strip will abut against the intermediate swing frame and push the intermediate swing frame to rotate, thereby driving the second linkage mechanism to move so that the second moving contact plate is away from the second stationary contact plate, and the automatic opening of the over-current protection side is realized in another way, further reducing the security risks.

[0035] Preferably, the over-current protection side is further fixedly provided with a quick tripping spring, the quick tripping spring is located on the outside of the included angle between the first linkage support and the first moving contact plate, the quick tripping spring abuts against one side of the first moving contact plate away from the first linkage support, and the quick tripping spring is in a stressed and deformed state.

[0036] By adopting the above technical scheme, when the dead point state between the first linkage support and the first moving contact plate is broken, the quick tripping spring can quickly push the first moving contact plate, which helps to ensure the normal operation and timeliness of the opening of the circuit breaker.

[0037] It is worth mentioning that the action time of the relay is relatively short, the first moving contact plate is quickly pushed by the quick tripping spring, the dead point state between the first linkage support and the first moving contact plate is timely broken and is difficult to be restored by itself without external force.

[0038] In summary, the present application has at least one of the following beneficial technical effects:

[0039] 1. By setting the rotation axis of the swing bracket and the transmission bracket collinearly, and by connecting the swing bracket and the transmission bracket with the linkage rod, when either the swing bracket or the transmission bracket is touched, the first moving contact plate will be triggered to move away from the first static contact plate, and the second moving contact plate will be triggered to move away from the second static contact plate, thereby realizing the synchronous opening of the circuit breaker to the zero line and the fire line in the state that the residual current of the zero line exceeds the rated value of the relay action, reducing the occurrence of electric shock of the maintenance personnel, reducing the security risks, and improving the safety;

[0040] 2. By means of the first rotating block rotatingly connected to the residual current protection side, the first linkage bracket is hinged to the first rotating block, and the two first pull rods are respectively provided through the first linkage bracket and the first moving contact plate. At the same time, the first linkage bracket is given a pulling force by the second tension spring to move to the side of the first fixed column, and the first moving contact plate is given a pushing force by the quick opening spring plate to move to the side of the first fixed column, which helps to ensure the normal and timely opening of the circuit breaker. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is a partial exploded view of the residual current protection side structure of the residual current operated circuit breaker mainly embodied in the present embodiment;

[0042] Figure 2 It is a partial exploded view of the overcurrent protection side structure of the residual current operated circuit breaker mainly embodied in the present embodiment;

[0043] Figure 3 It is a schematic view of the residual current protection side structure mainly embodied in the present embodiment;

[0044] Figure 4 It is an exploded schematic view of the first linkage mechanism structure mainly embodied in the present embodiment;

[0045] Figure 5 It is a schematic view of the overcurrent protection side structure mainly embodied in the present embodiment;

[0046] Figure 6 It is a schematic view of the second linkage mechanism and the synchronization structure mainly embodied in the present embodiment;

[0047] Figure 7 It is a partial exploded schematic view of the synchronization bracket structure mainly embodied in the present embodiment.

[0048] Fig. 1 is a partition frame; 11 is an avoidance hole; 12 is a first limiting groove; 13 is a second limiting groove; 2 is a residual current protection side; 21 is a first static contact plate; 22 is a first dynamic contact plate; 221 is a first waist-shaped hole; 222 is a second waist-shaped hole; 23 is a relay; 24 is a first base column; 25 is a first fixed column; 26 is a driving support; 261 is a supporting rod; 262 is a first torsional spring; 27 is a hinged column; 271 is an intermediate support; 272 is a second torsional spring; 28 is a quick opening spring; 3 is an overcurrent protection side; 31 is a second static contact plate; 32 is a second dynamic contact plate; 321 is a third waist-shaped hole; 322 is a fourth waist-shaped hole; 33 is an electromagnetic release; 34 is a second base column; 341 is a third torsional spring; 35 is a second fixed column; 36 is an intermediate swing support; 361 is a first swing plate; 362 is a second swing plate; 37 is a transmission support; 38 is a bimetallic strip; 381 is a high-expansion-coefficient layer; 382 is a low-expansion-coefficient layer; 4 is an encapsulation shell; 5 is a first linkage mechanism; 51 is a first rotating block; 511 is a first limiting block; 52 is a first linkage support; 521 is a first abutting surface; 53 is a first U-shaped rod; 531 is a first pull rod; 54 is a first pull spring; 55 is a second pull spring; 6 is a second linkage mechanism; 61 is a second rotating block; 611 is a second limiting block; 62 is a second linkage support; 621 is a second abutting surface; 63 is a second U-shaped rod; 631 is a second pull rod; 64 is a third pull spring; 65 is a fourth pull spring; 7 is a synchronization structure; 71 is a swing support; 711 is a swing-back plate; 72 is a linkage rod; 8 is a synchronization support; 81 is a sliding groove; 82 is a clamping groove. DETAILED DESCRIPTION

[0049] The application will be further described in detail below with reference to the accompanying drawings.

[0050] The application discloses a residual current circuit breaker.

[0051] Reference Figure 1 and Figure 2 The residual current circuit breaker comprises a partition frame 1 and an encapsulation shell 4, opposite sides of the partition frame 1 are respectively a residual current protection side 2 and an overcurrent protection side 3, and the encapsulation shell 4 is arranged on the residual current protection side 2 and the overcurrent protection side 3, and the two encapsulation shells 4 are fixed on the partition frame 1 by bolts.

[0052] The residual current protection side 2 is provided with a first static contact plate 21 and a first dynamic contact plate 22, the first static contact plate 21 is clamped and fixed to the residual current protection side 2, the first dynamic contact plate 22 is movably arranged on the residual current protection side 2, one end of the first dynamic contact plate 22 abuts against the first static contact plate 21 and is closed, the first dynamic contact plate 22 and the first static contact plate 21 are connected to the zero line through wires, and the first dynamic contact plate 22 and the first static contact plate 21 are in contact and are connected in series as a whole on the zero line. The residual current protection side 2 is further provided with a relay 23 and a first linkage mechanism 5, the relay 23 is in transmission connection with the first linkage mechanism 5 and drives the first dynamic contact plate 22 to move away from the first static contact plate 21 through the first linkage mechanism 5.

[0053] The overcurrent protection side 3 is provided with a second static contact plate 31 and a second dynamic contact plate 32, the second static contact plate 31 is clamped and fixed to the overcurrent protection side 3, the second dynamic contact plate 32 is movably arranged on the overcurrent protection side 3, one end of the second dynamic contact plate 32 abuts against the second static contact plate 31 and is closed, the second dynamic contact plate 32 and the second static contact plate 31 are connected to the live line through wires, and the second dynamic contact plate 32 and the second static contact plate 31 are in contact and are connected in series as a whole on the live line. The overcurrent protection side 3 is further provided with an electromagnetic release 33 and a second linkage mechanism 6, the electromagnetic release 33 is in transmission connection with the second linkage mechanism 6 and drives the second dynamic contact plate 32 to move away from the second static contact plate 31 through the second linkage mechanism 6. In addition, the partition frame 1 is further provided with a synchronization structure 7, the synchronization structure 7 is in transmission connection with the first dynamic contact plate 22 and the second linkage mechanism 6, and the first static contact plate 21, the first dynamic contact plate 22, the relay 23, the first linkage mechanism 5, the synchronization structure 7, the second static contact plate 31, the second dynamic contact plate 32, the electromagnetic release 33 and the second linkage mechanism 6 are all encapsulated on the partition frame 1 by the two encapsulation shells 4.

[0054] It should be pointed out that the relay 23 and the electromagnetic release 33 in the embodiment are both push rod type relays.

[0055] When the residual current of the zero line reaches the rated value of the relay 23, the relay 23 drives the first dynamic contact plate 22 to move away from the first static contact plate 21 through the first linkage mechanism 5, and the first dynamic contact plate 22 and the first static contact plate 21 change from the closed state to the open state; at the same time, the first dynamic contact plate 22 drives the synchronization structure 7, the synchronization structure 7 drives the second linkage mechanism 6, and the second dynamic contact plate 32 moves away from the second static contact plate 31, and the second dynamic contact plate 32 and the second static contact plate 31 change from the closed state to the open state, so that the circuit breaker can realize the synchronous opening of the zero line and the live line when the residual current of the zero line exceeds the rated value of the relay 23.

[0056] Referring to Figure 3 and Figure 4The middle part of the first moving contact plate 22 is provided with a first waist-shaped hole 221, the length direction of the first waist-shaped hole 221 is perpendicular to the length direction of the first moving contact plate 22, the residual current protection side 2 is vertically fixed with a first base column 24, the first base column 24 penetrates the first waist-shaped hole 221, and one side of the first moving contact plate 22 in the length direction abuts against the first stationary contact plate 21. An end of the first moving contact plate 22 away from the first stationary contact plate 21 is provided with a second waist-shaped hole 222.

[0057] The first linkage mechanism 5 comprises a first rotating block 51, a first linkage support 52 and a first U-shaped rod 53. The middle part of the first rotating block 51 is rotationally connected to the residual current protection side 2, the first rotating block 51 is located on the side of the second waist-shaped hole 222 away from the first waist-shaped hole 221, and the first rotating block 51 and the first stationary contact plate 21 are located on the same side of the first moving contact plate 22. One side of the first rotating block 51 is formed with a first limiting block 511, and a first limiting groove 12 is formed on the partition frame 1. The first limiting groove 12 is arc-shaped and is arranged around the first rotating block 51, one end of the first limiting groove 12 is close to the first moving contact plate 22, the other end of the first limiting groove 12 extends away from the first moving contact plate 22, the first limiting block 511 penetrates the first limiting groove 12, and the movement range of the first limiting block 511 is limited by the first limiting groove 12. The middle part of the first linkage support 52 is hingedly connected to the edge position of the first rotating block 51. The first U-shaped rod 53 comprises two first pull rods 531 which are parallel to each other. The axis of the first rotating block 51, the hinging axis of the first linkage support 52 and the two first pull rods 531 are all parallel to the axis of the first base column 24. One of the first pull rods 531 penetrates the side of the first linkage support 52 away from the first rotating block 51 along the axis thereof, and the other first pull rod 531 penetrates the second waist-shaped hole 222 along the axis thereof.

[0058] In the closed state, the length direction of the first linkage support 52 intersects the length direction of the first moving contact plate 22, and the included angle between the two is 90-180 degrees, preferably 95 degrees. The connecting line between the two first pull rods 531 is parallel to the length direction of the first linkage support 52. The axis of the first rotating block 51 is located on the inner side of the included angle between the first linkage support 52 and the first moving contact plate 22. The hinging point of the first linkage support 52 on the first rotating block 51 is located on the side of the first rotating block 51 close to the first moving contact plate 22, and the first limiting block 511 abuts against the side wall of the first limiting groove 12 away from the first moving contact plate 22. The side of the first linkage support 52 away from the first rotating block 51 is formed with a first abutting surface 521 which is arranged along the length direction of the first linkage support 52. The first abutting surface 521 is located on the outer side of the included angle between the first linkage support 52 and the first moving contact plate 22 and faces the inner side of the included angle. The first pull rod 531 penetrating the second waist-shaped hole 222 abuts against the first abutting surface 521.

[0059] The residual current protection side 2 is also fixedly provided with a first fixed column 25, which is arranged along the axis of the first base column 24 and located at the inner side of the included angle between the first linkage support 52 and the first moving contact plate 22. The first linkage mechanism 5 further comprises a first tension spring 54 and a second tension spring 55. One end of the first tension spring 54 is hooked to the first fixed column 25, and the other end of the first tension spring 54 is hooked to the part of the first moving contact plate 22 located between the first waist-shaped hole 221 and the second waist-shaped hole 222. One end of the second tension spring 55 is hooked to the first fixed column 25, and the other end of the second tension spring 55 is hooked to the first linkage support 52 on one side of the first rotating block 51, and the elastic coefficient of the first tension spring 54 is greater than that of the second tension spring 55.

[0060] At this time, under the cooperation of the first limiting block 511 and the first limiting groove 12, the first rotating block 51 is in a stable state, and the included angle between the first linkage support 52 and the first moving contact plate 22 is greater than 90 degrees. The line between the two first tension rods 531 is parallel to the length direction of the first linkage support 52. Under the greater tension of the first tension spring 54, the first linkage support 52 and the first U-shaped rod 53 will stably abut against the first moving contact plate 22 on one side of the second waist-shaped groove. The first linkage mechanism 5 and the first moving contact plate 22 are in a dead point state, the first moving contact plate 22 and the first stationary contact plate 21 stably contact and are in a stable closed state.

[0061] The relay 23 is located at the inner side of the included angle between the first linkage support 52 and the first moving contact plate 22, and is fixed to the residual current protection side 2. The residual current protection side 2 is also provided with a driving support 26. One end of the length direction of the driving support 26 is close to the ejector rod of the relay 23, and the other end of the driving support 26 extends to the included angle between the first linkage support 52 and the first moving contact plate 22 and is hinged to the residual current protection side 2 through a supporting rod 261. The supporting rod 261 is arranged along the axis of the first base column 24 and is fixed to the residual current protection side 2. The side of the driving support 26 close to the first linkage support 52 partially protrudes and is close to the part of the first linkage support 52 located at the inner side of the included angle between the first linkage support 52 and the first moving contact plate 22. Meanwhile, the supporting rod 261 is also sleeved with a first torsional spring 262. One torsional rod of the first torsional spring 262 abuts against the edge side wall of the residual current protection side 2, and the other torsional rod of the first torsional spring 262 is fixed to the driving support 26 and provides a pushing force to the driving support 26 to rotate to the side of the relay 23.

[0062] The hinge column 27 is axially fixed to the residual current protection side 2 along the first fixed column 25, and is adjacent to the first fixed column 25. The intermediate support 271 is rotatably connected to the hinge column 27. One side of the intermediate support 271 extends between the driving support 26 and the top rod of the relay 23. The end of the driving support 26 close to the relay 23 and the top rod of the relay 23 abut the opposite sides of the intermediate support 271 respectively. The hinge column 27 is further sleeved with the second torsional spring 272. The two torsional rods of the second torsional spring 272 are fixedly connected to the residual current protection side 2 and the intermediate support 271 respectively, and provide a pushing force to the intermediate support 271 to move to the side of the relay 23.

[0063] When the residual current of the zero line exceeds the movement rated value of the relay 23, the relay 23 pushes the intermediate support 271 to rotate. The intermediate support 271 pushes the driving support 26 to rotate. The protruding part of the driving support 26 abuts the first linkage support 52 and releases the dead point state of the first linkage mechanism 5. At this time, the second tension spring 55 pulls the first linkage support 52 to move to the side of the first fixed column 25, and pulls the first rotating block 51 to rotate to the side of the first fixed column 25. Then, the second tension spring 55 indirectly pulls the first moving contact plate 22 to move to the side of the first fixed column 25, and the first tension spring 54 directly pulls the first moving contact plate 22 to move to the side of the first fixed column 25. The first moving contact plate 22 is away from the first stationary contact plate 21, and the opening of the residual current protection side 2 is completed.

[0064] In order to ensure that the dead point state between the first linkage mechanism 5 and the first moving contact plate 22 is released in time, the overcurrent protection side 3 is further provided with a quick opening spring 28. The quick opening spring 28 is located outside the included angle between the first linkage support 52 and the first moving contact plate 22. One end of the quick opening spring 28 is fixed to the edge position of the overcurrent protection side 3. The middle part of the quick opening spring 28 abuts against the side of the first moving contact plate 22 away from the first linkage support 52, and the quick opening spring 28 is in a stressed and deformed state. When the protruding part of the driving support 26 touches the first linkage support 52, the quick opening spring 28 will immediately push the first moving contact plate 22 and immediately release the dead point state between the first linkage mechanism 5 and the first moving contact plate 22.

[0065] Referring to Figure 5 and Figure 6 , the middle part of the second moving contact plate 32 is provided with a third waist-shaped hole 321. The length direction of the third waist-shaped hole 321 is perpendicular to the length direction of the second moving contact plate 32. The overcurrent protection side 3 is axially fixed to the second base column 34 along the first base column 24. The second base column 34 penetrates the third waist-shaped hole 321. One side of the length direction of the second moving contact plate 32 abuts against the second stationary contact plate 31. The end of the second moving contact plate 32 away from the second stationary contact plate 31 is provided with a fourth waist-shaped hole 322.

[0066] The structure and installation method of the second linkage mechanism 6 on the separator 1 are the same as those of the first linkage mechanism 5. Furthermore, the second linkage mechanism 6 and the second moving contact plate 32 can also form a dead point state; therefore, the second linkage mechanism 6 will not be described in detail. It should be noted that the overcurrent protection side 3 is fixed with a second fixed column 35 along the second base column 34. The second linkage mechanism 6 includes a second rotating block 61, a second linkage bracket 62, and a second U-shaped rod 63. The second rotating block 61 is rotatably connected to the overcurrent protection side 3 at its center and is collinear with the rotation axis of the first rotating block 51. A second limiting block 611 is formed on one side of the second rotating block 61. A second limiting groove 13 is also provided on the separator 1 along the direction of the first limiting groove 12. The second limiting block 611 passes into the second limiting groove 13. The second U-shaped rod 63 includes two parallel second pull rods 631. One of the second pull rods 631 passes through the second linkage bracket 62 along its axis. The other second pull rod 631 passes through the fourth waist-shaped hole 322 along its axis. A second abutment surface 621 is provided on the second linkage bracket 62. The second pull rod 631 passing through the fourth waist-shaped hole 322 abuts against the second abutment surface 621. The second linkage mechanism 6 also includes a third tension spring 64 and a fourth tension spring 65. One end of the third tension spring 64 is hooked to the part of the second fixed post 35 and the second moving contact plate 32 located between the third waist-shaped hole 321 and the fourth waist-shaped hole 322. The fourth tension spring 65 is hooked between the first fixed post 25 and the second linkage bracket 62, and the elastic coefficient of the third tension spring 64 is greater than that of the fourth tension spring 65.

[0067] The overcurrent protection side 3 is also rotatably equipped with an intermediate swing frame 36, which is adjacent to the second base column 34. The intermediate swing frame 36 includes a first swing plate 361, which abuts against the side of the second linkage bracket 62 near the second moving contact plate 32. The electromagnetic trip unit 33 is located inside the angle between the second linkage bracket 62 and the second moving contact plate 32, and is fixed to the overcurrent protection side 3. The overcurrent protection side 3 is also equipped with a transmission bracket 37, which is located between the electromagnetic trip unit 33 and the intermediate swing frame 36. The middle part of the transmission bracket 37 is rotatably connected to the overcurrent protection side 3. One side of the transmission bracket 37 in the length direction abuts against the top rod of the electromagnetic trip unit 33, and the other side of the transmission bracket 37 abuts against the side of the first swing plate 361 away from the second linkage bracket 62. Meanwhile, a third torsion spring 341 is also fitted on the second base column 34. One torsion bar of the third torsion spring 341 abuts against the corresponding encapsulation shell 4, and the other torsion bar of the third torsion spring 341 abuts against the intermediate swing frame 36 and provides the intermediate swing frame 36 with a thrust to rotate towards the transmission support 37.

[0068] When the live wire experiences an overcurrent, the electromagnetic trip unit 33 push rod will push the transmission bracket 37 to rotate. The transmission bracket 37 will push the intermediate swing bracket 36 to rotate towards the second linkage bracket 62 and push the second linkage bracket 62 to move, thereby releasing the dead point state between the second linkage mechanism 6 and the second moving contact plate 32. At this time, the second moving contact plate 32 will be driven and disengaged from the second stationary contact plate 31 with the cooperation of the third tension spring 64 and the fourth tension spring 65, completing the opening operation of the overcurrent protection side 3.

[0069] A bimetallic strip 38 is provided on the side of the intermediate swing frame 36 away from the second linkage bracket 62. The bimetallic strip 38 is connected in series with the live wire. One end of the bimetallic strip 38 is fixed to the overcurrent protection side 3, and the other end of the bimetallic strip 38 is close to the intermediate swing frame 36. A second swing plate 362 extends from the side of the intermediate swing frame 36 near the bimetallic strip 38 toward the bimetallic strip 38. The bimetallic strip 38 includes a high expansion coefficient layer 381 and a low expansion coefficient layer 382. The low expansion coefficient layer 382 is close to the side of the intermediate swing frame 36. In this embodiment, the high expansion coefficient layer 381 is a copper layer, and the low expansion coefficient layer 382 is an iron layer. When the instantaneous current of the live wire exceeds the rated current of the electrical equipment for a long time but is less than the trigger current of the electromagnetic trip unit 33, the bimetallic strip 38 will become hot. Since the expansion coefficient of copper is greater than that of iron, the bimetallic strip 38 will bend towards the second swing plate 362 and push the intermediate swing frame 36 to rotate, thereby driving the second moving contact plate 32 away from the second stationary contact plate 31 through the second linkage mechanism 6.

[0070] Next, see Figure 3 and Figure 6 The synchronization structure 7 includes a swing bracket 71 and a linkage rod 72. The middle part of the swing bracket 71 is rotatably connected to the residual current protection side 2. The rotation axis of the swing bracket 71 is collinear with the rotation axis of the transmission bracket 37. One side of the swing bracket 71 along its length is located near the first moving contact plate 22, between the first waist-shaped hole 221 and the second waist-shaped hole 222. The separator 1 has a clearance hole 11 on the other side along the length of the swing bracket 71. The clearance hole 11 passes through the residual current protection side 2 and the overcurrent protection side 3. The linkage rod 72 is fixed at the position of the swing bracket 71 corresponding to the clearance hole 11. The linkage rod 72 passes through the clearance hole 11 and enters the transmission bracket 37, and the linkage rod 72 is fixed to the transmission bracket 37. Furthermore, a return swing plate 711 extends from the side of the swing bracket 71 near the first moving contact plate 22 toward the drive bracket 26 and abuts against the middle part of the drive bracket 26.

[0071] When the residual current of the neutral wire reaches the rated value of the relay 23, the first moving contact plate 22 will rotate around the first base column 24 and move away from the first stationary contact plate 21. At this time, the first moving contact plate 22 will push the swing bracket 71 to rotate. Under the action of the linkage rod 72, the transmission bracket 37 will rotate synchronously and act on the intermediate swing bracket 36 and the second linkage bracket 62, thereby releasing the dead point state between the second linkage mechanism 6 and the second moving contact plate 32, and driving the second moving contact plate 32 to rotate and move away from the second stationary contact plate 31, thereby realizing the synchronous opening of the circuit breaker for the neutral and live wires.

[0072] For easier closing of the circuit breaker, see [link / reference] Figure 7 The first limiting groove 12 and the second limiting groove 13 are located on the same side of the partition frame 1 and both open to the outside. The first limiting block 511 is exposed to the outside through the first limiting groove 12, and the second rotating block 61 is exposed to the outside through the second limiting groove 13. A synchronous bracket 8 is provided between the first limiting block 511 and the second limiting block 611. The synchronous bracket 8 is located outside the partition frame 1, and the first limiting block 511 and the second limiting block 611 are respectively snapped and fixedly connected on opposite sides of the synchronous bracket 8. In this embodiment, the synchronous bracket 8 has a sliding groove 81. The first limiting block 511 and the second limiting block 611 are both embedded in the sliding groove 81. Snap-fit ​​grooves 82 are formed on both sides of the sliding groove 81 along its length. The first limiting block 511 and the second limiting block 611 are respectively snapped and fixed within the two snap-fit ​​grooves 82. The synchronous bracket 8 is made of plastic and has a certain degree of elasticity. Pushing the side walls of the sliding groove 81 along its width allows the first limiting block 511 and the second limiting block 611 to easily disengage from the two snap-fit ​​grooves 82. In practical applications, operators can synchronously rotate the first rotating block 51 and the second rotating block 61 through the synchronous bracket 8 to close the circuit breaker.

[0073] The implementation principle of a residual current operated circuit breaker according to an embodiment of this application is as follows:

[0074] When the residual current in the neutral wire reaches the rated operating value of relay 23, relay 23 pushes the intermediate bracket 271 to rotate. The intermediate bracket 271 then pushes the drive bracket 26 to rotate, and the protruding part of the drive bracket 26 abuts against the first linkage bracket 52. The quick-opening spring 28 immediately pushes the first moving contact plate 22, and immediately releases the dead point state between the first linkage mechanism 5 and the first moving contact plate 22. At this time, the second tension spring 55 pulls the first linkage bracket 52 toward the first fixed post 25 and rotates it toward the first fixed post 25. Subsequently, the second tension spring 55 and the first tension spring 54 cooperate to pull the first moving contact plate 22 toward the first fixed post 25, causing the first moving contact plate 22 to move away from the first stationary contact plate 21, and completing the opening of the residual current protection side 2.

[0075] After the first moving contact plate 22 is activated, it will push the swing bracket 71 to rotate. Under the action of the linkage rod 72, the transmission bracket 37 will rotate synchronously and act on the intermediate swing bracket 36 and the second linkage bracket 62. With the cooperation of the third tension spring 64 and the fourth tension spring 65, the second moving contact plate 32 will be pulled towards the second fixed column 35, so that the second moving contact plate 32 is away from the second stationary contact plate 31, and the overcurrent protection side 3 will be opened.

[0076] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A residual current operated circuit breaker, comprising a partition frame (1), wherein the two opposite sides of the partition frame (1) are a residual current protection side (2) and an overcurrent protection side (3), wherein the residual current protection side (2) is provided with a first stationary contact plate (21) and a first moving contact plate (22) that abut against each other, the first stationary contact plate (21) is fixed to the residual current protection side (2), the first moving contact plate (22) is movably disposed on the residual current protection side (2), the residual current protection side (2) is further provided with a relay (23) and a first linkage mechanism (5), wherein the relay (23) drives the first moving contact plate (22) away from the first stationary contact plate (21) through the first linkage mechanism (5); The overcurrent protection side (3) is equipped with a second stationary contact plate (31) and a second moving contact plate (32) that abut against each other. The second stationary contact plate (31) is fixed to the overcurrent protection side (3), and the second moving contact plate (32) is movably disposed on the overcurrent protection side (3). The overcurrent protection side (3) is also equipped with an electromagnetic trip device (33) and a second linkage mechanism (6). Its features are: The residual current protection side (2) is also provided with a swing bracket (71), the middle part of the swing bracket (71) is rotatably connected to the residual current protection side (2), one side of the swing bracket (71) in the length direction is close to the first moving contact plate (22), and the other side of the swing bracket (71) is fixed with a linkage rod (72). When the first moving contact plate (22) moves away from the first stationary contact plate (21) and the gate is opened, the first moving contact plate (22) abuts against the swing bracket (71) and drives the swing bracket (71) to rotate; The overcurrent protection side (3) is provided with a transmission bracket (37) between the electromagnetic trip unit (33) and the second linkage mechanism (6). The middle part of the transmission bracket (37) is rotatably connected to the overcurrent protection side (3). The rotation axis of the transmission bracket (37) is collinear with the rotation axis of the swing bracket (71). The electromagnetic trip unit (33) and the second linkage mechanism (6) are respectively connected to the two sides of the transmission bracket (37) in the length direction. The second linkage mechanism (6) is connected to the second moving contact plate (32) and drives the second moving contact plate (32) away from the second stationary contact plate (31). Furthermore, the partition frame (1) is provided with a clearance hole (11) that passes through the residual current protection side (2) and the overcurrent protection side (3). The end of the linkage rod (72) away from the swing bracket (71) passes through the clearance hole (11) and is fixed to the side of the transmission bracket (37) near the electromagnetic trip unit (33). The first moving contact plate (22) has a first waist-shaped hole (221) in the middle. The length direction of the first waist-shaped hole (221) is perpendicular to the length direction of the first moving contact plate (22). The residual current protection side (2) is fixed with a first base column (24). The first base column (24) passes through the first waist-shaped hole (221). One side of the first moving contact plate (22) in the length direction abuts against the first stationary contact plate (21). The end of the first moving contact plate (22) away from the first stationary contact plate (21) has a second waist-shaped hole (222). The first linkage mechanism (5) includes a first rotating block (51), a first linkage bracket (52), and a first U-shaped rod (53). The middle part of the first rotating block (51) is rotatably connected to the residual current protection side (2). A first limiting block (511) is formed on one side of the first rotating block (51). A first limiting groove (12) is provided on the separator (1). The first limiting groove (12) is arc-shaped and arranged around the first rotating block (51). One end of the first limiting groove (12) is close to the first moving contact plate (22). The other end of the limiting groove (12) extends away from the first moving contact plate (22), and the first limiting block (511) passes through the first limiting groove (12); the middle part of the first linkage bracket (52) is hinged to the edge of the first rotating block (51), and the first U-shaped rod (53) includes two parallel first pull rods (531), one of which passes through the side of the first linkage bracket (52) away from the first rotating block (51), and the other first pull rod (531) passes through the second waist-shaped hole (222).

2. A residual current operated circuit breaker according to claim 1, characterized in that: In the closed state, the length direction of the first linkage bracket (52) intersects the length direction of the first moving contact plate (22), and the included angle between them is not less than 90 degrees and less than 180 degrees. The line connecting the two first pull rods (531) is parallel to the length direction of the first linkage bracket (52). The axis of the first rotating block (51) is located inside the angle between the first linkage bracket (52) and the first moving contact plate (22). The hinge point of the first linkage bracket (52) on the first rotating block (51) is located near the first moving contact plate (22). One side of the movable contact plate (22) and the first limiting block (511) abuts against the side wall of the first limiting groove (12) away from the first movable contact plate (22); the first linkage bracket (52) has a first abutting surface (521) formed on the side away from the first rotating block (51), the first abutting surface (521) is located outside the angle between the first linkage bracket (52) and the first movable contact plate (22) and faces the inside of the angle, and the first pull rod (531) passing through the second waist-shaped hole (222) abuts against the first abutting surface (521). The residual current protection side (2) is fixedly provided with a first fixed post (25). The first fixed post (25) is located inside the angle between the first linkage bracket (52) and the first moving contact plate (22). The first linkage mechanism (5) also includes a first tension spring (54). One end of the first tension spring (54) is hooked to the first fixed post (25), and the other end of the first tension spring (54) is hooked to the part of the first moving contact plate (22) located between the first waist-shaped hole (221) and the second waist-shaped hole (222).

3. A residual current operated circuit breaker according to claim 2, characterized in that: The first linkage mechanism (5) further includes a second tension spring (55), one end of which is hooked to the first fixed column (25), and the other end of which is hooked to the first linkage bracket (52) on one side of the first rotating block (51), and the elastic coefficient of the first tension spring (54) is greater than that of the second tension spring (55).

4. A residual current operated circuit breaker according to claim 2, characterized in that: The residual current protection side (2) is also hinged with a drive bracket (26). One end of the drive bracket (26) in the length direction is close to the top rod of the relay (23), and the side of the drive bracket (26) in the length direction away from the relay (23) is close to the side of the first linkage bracket (52) away from the first rotating block (51). When the gate is opened, the relay (23) pushes the drive bracket (26) to rotate. The drive bracket (26) abuts against the first linkage bracket (52) located inside the angle between the first linkage bracket (52) and the first moving contact plate (22) and drives the first linkage bracket (52) to rotate.

5. A residual current operated circuit breaker according to claim 4, characterized in that: The residual current protection side (2) is also fixed with a support rod (261), the support rod (261) passes through the drive bracket (26), and the drive bracket (26) is hinged to the residual current protection side (2) through the support rod (261). The support rod (261) is fitted with a first torsion spring (262) for driving the drive bracket (26) to twist toward the relay (23).

6. A residual current operated circuit breaker according to claim 2, characterized in that: The second linkage mechanism (6) includes a second rotating block (61), which is rotatably connected to the overcurrent protection side (3), and the rotation axis of the second rotating block (61) is collinear with the rotation axis of the first rotating block (51). A second limiting block (611) is formed on one side of the second rotating block (61). The separator (1) has a second limiting groove (13) along the direction of the first limiting groove (12). The second limiting block (611) passes into the second limiting groove (13). The first limiting groove (12) and the second limiting groove (13) are connected. The first limiting block (511) and the second limiting block (611) are fixedly connected to a synchronous bracket (8) through the connection between the first limiting groove (12) and the second limiting groove (13).

7. A residual current operated circuit breaker according to claim 6, characterized in that: The first limiting groove (12) and the second limiting groove (13) are both open to the outside. The first limiting block (511) is exposed to the outside through the first limiting groove (12), and the second limiting block (611) is exposed to the outside through the second limiting groove (13). The synchronous bracket (8) is located outside the separator (1).

8. A residual current operated circuit breaker according to claim 1, characterized in that: The overcurrent protection side (3) is rotatably provided with an intermediate swing frame (36). The side of the intermediate swing frame (36) away from its rotation axis is connected to the second linkage mechanism (6). A bimetallic strip (38) is provided on one side of the intermediate swing frame (36). The bimetallic strip (38) is connected in series with the live wire. One end of the bimetallic strip (38) is fixed to the overcurrent protection side (3). The other end of the bimetallic strip (38) is close to the intermediate swing frame (36). The bimetallic strip (38) includes a high expansion coefficient layer (381) and a low expansion coefficient layer (382). The low expansion coefficient layer (382) is located on the side close to the intermediate swing frame (36). When the bimetallic strip (38) is heated and bends toward the middle swing frame (36), the bimetallic strip (38) will abut against the middle swing frame (36) and push the middle swing frame (36) to rotate, thereby driving the second linkage mechanism (6) to move so that the second moving contact plate (32) moves away from the first stationary contact plate (21).

9. A residual current operated circuit breaker according to claim 2, characterized in that: The overcurrent protection side (3) is also fixedly provided with a quick-opening spring (28). The quick-opening spring (28) is located outside the angle between the first linkage bracket (52) and the first moving contact plate (22). The quick-opening spring (28) abuts against the side of the first moving contact plate (22) away from the first linkage bracket (52), and the quick-opening spring (28) is in a state of stress deformation.

Images