Direct-current over-current tripping device

Abstract

The utility model discloses a direct-current over-current tripping device, which comprises a device body, a connecting rod and a tripper action indicator, and is characterized in that the device body comprises a magnetic conductive frame, a magnetic conductive block, a main circuit, a spring, a detachable rotatable magnetic conductive block and a rotating shaft, and at least one notch is formed in the annular middle axis line of the magnetic conductive frame; the rotating shaft is fixedly installed in the center of the notch perpendicular to the middle shaft path, the center of the rotatable magnetic block is installed on the rotating shaft and rotates around the rotating shaft, a magnetic frame boss is arranged in the notch, and the release action indicator is connected with the end, away from the shaft, of the rotatable magnetic block through a connecting rod and generates a release signal during release. According to the scheme, the problems of insufficient tripping speed, difficulty in gear adjustment and difficulty in setting over-current tripping indication in the prior art are solved, and the beneficial effects of simplifying the tripping indication and current gear adjustment structure and improving the tripping speed are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breakers, and in particular to an overcurrent tripping device for a DC circuit breaker. Background Art

[0002] As the core protection equipment of the DC traction power supply system, the DC circuit breaker is an important guarantee for the safe operation of the DC power supply system. Compared with the AC system, the DC system has no natural zero crossing point, so it is more difficult to open and close the DC system. Therefore, a safe and reliable overcurrent tripping device is required to enable the DC circuit breaker to quickly cut off the short-circuit current in the event of a circuit fault; at the same time, when the DC circuit breaker is working normally, that is, when the main circuit current is at or below the tripping device operating current, the tripping device prevents false operation, ensuring the safe and reliable operation of the urban rail transit DC traction power supply system.

[0003] Some solutions are adopted in the prior art to realize DC tripping: for example, the patent document with application publication number CN113161210A discloses a dual magnetic circuit high current tripping device for a circuit breaker, including a magnetic frame, an armature, a short-circuit ring, a fixing plate, a compression spring and a guide rod. A first rectangular opening is provided in the middle of the magnetic frame for passing the current-carrying copper bar of the circuit breaker, an inverted triangular opening is provided in the upper part for setting the armature, and a second rectangular opening is provided in the upper part of the inverted triangular opening for dividing the magnetic circuit. The tripping device has a complex structure, and the mass of the magnetic block increases, which reduces the action speed of the tripping device. For another example, the patent document with authorization announcement number CN210092017U discloses an overload current high-speed tripping device for a DC circuit breaker, including a magnetic frame, a triangular opening is provided in the middle of the top of the magnetic frame, an aluminum square tube is fixed at the bottom, a magnetic block is provided in the triangular opening, the aluminum square tube passes through the lower part of the magnetic frame and extends into the magnetic frame, and a guide block is sleeved on its upper end. The trip device can conveniently adjust the limit value of the overload current of the main circuit of the circuit breaker. However, the top of the magnetic frame of the trip device is a triangular opening, and the corresponding magnetic block is a triangle. When the main circuit current is lower than the trip device action current, the magnetic block will generate a reaction force to overcome the spring under the action of electromagnetic force, reducing the spring holding force of the trip mechanism, which is easy to cause the trip mechanism to malfunction under low current conditions. For example, the patent document with application publication number CN117558594A discloses an overcurrent tripping device for a DC circuit breaker, including a magnetic frame, a magnetic block, a main circuit, a spring, a fixed plate, and a magnetic rod. An inclined notch is provided at the middle position of the top of the magnetic frame. The cross section of the magnetic block is trapezoidal and is located in the notch of the magnetic frame. The main circuit vertically passes through the loop formed by the magnetic block and the magnetic frame. The spring is connected to the magnetic block. The short side distance of the notch of the magnetic frame is less than the length of the bottom of the long side of the trapezoidal cross section of the magnetic block. The magnetic block can move vertically in the notch. A fixed plate is fixed on the long side of the notch of the magnetic frame. A plurality of magnetic rod mounting holes are opened on the left and right sides of the fixed plate. The magnetic rod is inserted into the magnetic rod mounting hole. The tripping device can improve the action sensitivity of the circuit breaker, but the tripping speed is insufficient, and there is no overcurrent tripping device indicator or tripping action auxiliary contact.

[0004] In summary, most of the current DC overcurrent release devices have the disadvantages of complex structure, insufficient tripping speed, poor reliability, difficulty in gear adjustment, and no overcurrent release device indicator or tripping action auxiliary contacts. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a DC overcurrent tripping device to solve the problems of the above-mentioned existing DC overcurrent tripping devices, such as complex structure, insufficient tripping speed, poor reliability, difficulty in gear adjustment, and lack of overcurrent tripping device indicator or tripping action auxiliary contacts.

[0006] To achieve the above objectives, this scheme is implemented through the following technical solutions:

[0007] A DC overcurrent tripping device comprises a device body, wherein the device body comprises an annular magnetic conductive frame, an overhead magnetic conductive block, a main circuit, and a spring; an inclined notch is arranged at the middle position on the top of the magnetic conductive frame; the overhead magnetic conductive block has a trapezoidal cross section and is located in the notch of the magnetic conductive frame; the inclined end faces on both sides of the magnetic conductive block are parallel to the inclined end faces on both sides of the notch of the magnetic conductive frame; the main circuit vertically passes through the loop formed by the overhead magnetic conductive block and the magnetic conductive frame; one end of the spring is fixed to a part inside the magnetic conductive frame, and the other end is connected to the overhead magnetic conductive block; the DC overcurrent tripping device further comprises a connecting rod of insulating material and a tripping device action indicator; the tripping device action indicator is connected to the device body through the connecting rod and maintains an insulation distance with the device body; the device body further comprises a detachable and rotatable magnetic conductive block and a rotating shaft; the magnetic conductive block is rotatable and has a rotation axis ... At least one notch perpendicular to the central axis path is provided on the annular central axis route of the frame, the rotating axis is fixedly installed in the center of the notch perpendicular to the central axis path, the center of the rotatable magnetic block is installed on the rotating axis and rotates around the rotating axis, and a limiting device is also provided in the notch perpendicular to the central axis path to limit the rotatable magnetic block so that the rotatable magnetic block is maintained at a position perpendicular to the central axis path using a self-resetting elastic member when not tripped, the magnetic frame is provided with a magnetic frame boss on the inner side of the notch perpendicular to the central axis path, the magnetic frame boss is provided with a contact surface that can smoothly contact the radial surface of the rotatable magnetic block, the distal end of the rotatable magnetic block is connected to one end of a connecting rod through a connecting shaft, and the other end of the connecting rod is connected to a tripper action indicator and causes the tripper action indicator to generate a tripping signal when tripped.

[0008] Preferably, the tripper action indicator comprises a guide groove and a travel switch at the end of the guide groove, the other end of the connecting rod slides in the guide groove, and the travel switch generates a tripping signal when tripping.

[0009] Preferably, two notches perpendicular to the central axis path are arranged on the annular central axis route of the magnetic frame, and rotatable magnetic blocks are installed in both notches, and one of the rotatable magnetic blocks is connected to the release action indicator.

[0010] Preferably, two notches perpendicular to the central axis path are provided on the annular central axis route of the magnetic frame, wherein a rotatable magnetic block connected to the release action indicator is installed in one of the notches, and the other notch is not installed with a rotatable magnetic block.

[0011] Preferably, the limiting device comprises a limiting block, and the limiting block is fixedly installed on the inner side of the notch perpendicular to the central axis path.

[0012] Preferably, the inclined notch of the magnetic conductive frame is larger at the top and smaller at the bottom, and the cross section of the top magnetic conductive block has the upper long side at the top and the lower short side at the bottom.

[0013] Preferably, the magnetic conductive frame is formed by splicing a plurality of pieces of magnetic conductive materials, and the magnetic conductive frame and the top magnetic conductive block are formed by vertically stacking a plurality of layers of magnetic conductive materials along the direction of current flow.

[0014] Preferably, the self-resetting elastic member is a compression spring or a torsion spring that withstands torsional torque.

[0015] Preferably, the insulating material of the connecting rod is epoxy resin.

[0016] Preferably, the direction of the current in the main circuit is forward or reverse.

[0017] Compared with the prior art, the present solution has the following beneficial effects: at least one notch perpendicular to the central axis path is provided on the annular central axis route of the magnetic frame of the DC overcurrent release device, and related components such as rotatable magnetic blocks, rotating shafts and torsion springs are symmetrically provided on both sides, which can increase the electromagnetic attraction between the second magnetic frame, the first magnetic frame and the magnetic blocks, and improve the operation reliability and speed of the release device; the rotatable magnetic blocks are detachable to achieve the gear adjustment of the release device; the rotatable magnetic blocks are connected to the release action indicator through a connecting rod, and a travel switch is provided in the release action indicator, which can indicate whether the overcurrent release device is in action, thereby achieving the purpose of indicating the release state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a cross-sectional schematic diagram of the present application when there is no current in the main circuit or the current is less than the tripping action current in an initial state of a certain embodiment of the present application;

[0019] Figure 2 This is a cross-sectional schematic diagram of the present application when the current in the main circuit of a certain embodiment of the present application is greater than the tripping action current;

[0020] Figure 3 This is a cross-sectional schematic diagram of another embodiment of the present application when the main circuit has no current or the current is less than the tripping action current in the initial state of the present application;

[0021] Figure 4 This is a cross-sectional schematic diagram of another embodiment of the present application when the current in the main circuit is greater than the tripping action current;

[0022] Figure 5 This is a cross-sectional schematic diagram of another embodiment of the present application when the main circuit has no current or the current is less than the tripping action current in the initial state of the present application;

[0023] Figure 6 This is a cross-sectional schematic diagram of another embodiment of the present application when the current in the main circuit is greater than the tripping action current;

[0024] Among them, 1-main circuit, 2-second magnetic conductive frame, 3-first magnetic conductive frame, 4-top magnetic conductive block, 5-spring guide device, 6-spring, 7-limit block, 8-magnetic conductive frame boss, 9-rotatable magnetic conductive block, 10-rotating shaft, 11-torsion spring, 12-connecting shaft, 13-connecting rod, 14-release device action indicator, 15-guide groove, 16-travel switch, 17-fixed support. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0026] The present embodiment provides a technical solution: a DC overcurrent tripping device, comprising a device body, wherein the device body comprises an annular magnetic conductive frame, a top magnetic conductive block 4, a main circuit 1, and a spring 6. An inclined notch is arranged at the middle position of the top of the magnetic conductive frame. The top magnetic conductive block 4 has a trapezoidal cross-section and is located in the notch of the magnetic conductive frame. The inclined end faces on both sides of the top magnetic conductive block 4 are parallel to the inclined end faces on both sides of the notch of the magnetic conductive frame. The main circuit 1 vertically passes through the loop formed by the top magnetic conductive block 4 and the magnetic conductive frame. One end of the spring 6 is fixed to a part inside the magnetic conductive frame, and the other end is connected to the top magnetic conductive block 4. In the embodiment of the present application, the inclined notch of the magnetic frame is larger at the top and smaller at the bottom. The cross section of the top magnetic block 4 has the upper long side bottom at the top and the lower short side bottom at the bottom. When the top magnetic block 4 is released, the top magnetic block 4 moves from top to bottom. There is a spring 6 below the top magnetic block 4. There is also a spring guide 5 inside the spring 6. The spring guide 5 is a combination of a fixed rod and a fixed sleeve. The fixed rod is fixed to the parts inside the magnetic frame, and the fixed sleeve is fixed below the magnetic block 4. When the spring 6 is deformed and compressed, the fixed rod can extend into the fixed sleeve. Since the spring guide 5 passes through the spring 6, it can prevent the middle body of the spring 6 from being pressed to one side when it is deformed and compressed, thereby better providing an upward holding force to the top magnetic block 4. Of course, the top magnetic block 4 can also be moved from bottom to top when it is released by changing the direction of the inclined end faces of the magnetic frame and the top magnetic block 4. When the current in the main circuit 1 is in the forward or reverse direction, that is, the current direction in the conductor in the figure is perpendicular to the paper surface and inward or outward, a magnetic flux will be generated in the DC overcurrent tripping device, so that the DC overcurrent tripping device of the present application can operate normally. Therefore, the DC overcurrent tripping device is a bidirectional tripping device.

[0027] The DC overcurrent tripping device of the present application also includes a connecting rod 13 of insulating material and a tripping device action indicator 14. In this embodiment, the insulating material is epoxy resin. The tripping device action indicator 14 is connected to the device body through the connecting rod 13 and maintains an insulation distance from the device body. The device body also includes a detachable and rotatable magnetic conductive block 9 and a rotating shaft 10. The annular central axis of the magnetic conductive frame is provided with at least one notch perpendicular to the central axis path. In the embodiment of the present application, Figure 1 and Figure 2 Two gaps are set on both sides of the circular route to divide the magnetic conductive frame into two upper first magnetic conductive frames 3 and a lower second magnetic conductive frame 2, that is, the second magnetic conductive frame 2 and the first magnetic conductive frame 3 are fixed in position, and the top magnetic conductive block 4 is located in the gaps of the two first magnetic conductive frames 3, and can move vertically up and down in the gaps to form a loop with the second magnetic conductive frame 2 and the first magnetic conductive frame 3. The main circuit 1 vertically passes through the loop formed by the second magnetic conductive frame 2, the first magnetic conductive frame 3 and the top magnetic conductive block 4. Rotatable magnetic blocks 9 are installed in both gaps, one of which is connected to the tripper action indicator 14. The rotating shaft 10 is fixedly installed at the center of the gap perpendicular to the central axis path. The rotatable magnetic block of this embodiment is in the shape of a rectangular plate. The center of the rotatable magnetic block 9 is installed on the rotating shaft 10 and rotates around the rotating shaft 10. A limiting device is also installed in the gap perpendicular to the central axis path to limit the rotatable magnetic block 9 so that the rotatable magnetic block 9 is kept at a position perpendicular to the central axis path using a self-resetting elastic member when it is not tripped. In this embodiment, the position perpendicular to the central axis path is a horizontal position, and the self-resetting elastic member is a torsion spring 11 that withstands torsional moment. One leg of the torsion spring 11 is fixed on the rotatable magnetic block 9, and the other leg can be fixed in the fixed rotating shaft notch. Of course, a compression spring can also be used. When a compression spring is used, the other end of the compression spring needs to be fixed at a suitable position in the notch so that the rotatable magnetic block 9 can return to a horizontal position. The magnetic frame is provided with a magnetic frame boss 8 on the inner side of the notch perpendicular to the central axis path. The magnetic frame boss 8 is provided with a contact surface that can be in smooth contact with the radial surface of the rotatable magnetic block 9. The distal end of the rotatable magnetic block 9 is connected to one end of a connecting rod 13 through a connecting shaft 12. The other end of the connecting rod 13 is connected to a tripping device action indicator 14 and causes the tripping device action indicator 14 to generate a tripping signal when tripping.

[0028] like Figure 3 and Figure 4In another embodiment, two notches perpendicular to the central axis path are also provided on the annular central axis route of the magnetic conductive frame, in which a rotatable magnetic conductive block 9 connected to the tripper action indicator 14 is installed in one of the notches, and the rotatable magnetic conductive block 9 is not installed in the other notch, that is, the rotatable magnetic conductive block 9 in the other notch can be removed as needed. After the rotatable magnetic conductive block 9 is removed, it will affect the magnetic flux generated in the loop composed of the second magnetic conductive frame 2, the first magnetic conductive frame 3 and the top magnetic conductive block 4, reduce the electromagnetic attraction generated between the second magnetic conductive frame 2, the first magnetic conductive frame 3 and the top magnetic conductive block 4, thereby reducing the tripping action current of the device, and realizing different gear adjustments of the tripping action current of the device.

[0029] like Figure 5 and Figure 6 In yet another embodiment, in order to facilitate processing and manufacturing, the rotatable magnetic conductive block 9, rotating shaft 10 and torsion spring 11 that are symmetrically arranged on the left and right are eliminated, that is, the magnetic conductive frame is only divided into a first magnetic conductive frame 3 on the upper side and a second magnetic conductive frame 2 on the lower side.

[0030] Of course, the arrangement of the notches perpendicular to the central axis path may be more than two, for example, they may be arranged at any suitable position such as the bottom of the magnetic conductive frame.

[0031] In this embodiment, the tripping device action indicator 14 is located on one side of the rotatable magnetic conductive block 9 and is fixed on a fixed support 17. The fixed support 17 maintains a certain distance from the tripping device body so as to be isolated from the main circuit 1, thereby playing an insulating role between the main circuit 1 and the tripping device action indicator 14.

[0032] The tripper action indicator 14 includes a guide groove 15 and a travel switch 16 at the end of the guide groove. The other end of the connecting rod 13 slides in the guide groove 15, and the travel switch 16 generates a trip signal when the trip is triggered. The guide groove 15 is generally in the same straight line as the rotatable magnetic block 9 when it is not tripped. In this embodiment, the guide groove 15 is placed horizontally, and the travel switch 16 is arranged at one end of the far connecting rod 13, which is the right side of the guide groove 15 in the figure. The rotatable magnetic block 9 can drive one end of the connecting rod 13 to move through the connecting shaft 12 when it rotates during tripping, and the other end of the connecting rod 13 can slide left and right in the guide groove 15. When the trip is triggered, the connecting rod 13 is separated from the original contact travel switch 16 to generate a trip signal. Of course, it can also be set at the other end of the guide groove to convert the original disengaged state into a contact state to generate a trip signal.

[0033] The limiting device includes a limiting block 7, which is fixedly installed on the inner side of the notch perpendicular to the central axis path. In this embodiment, the limiting block 7 is arranged at the top of the inner side of the notch, and the bottom surface of the limiting block 7 keeps the rotatable magnetic block 9 at a position perpendicular to the central axis path when not tripped. The limiting device can also use a suitable structural form to achieve the same purpose.

[0034] In this embodiment, the second magnetic conductive frame 2, the first magnetic conductive frame 3 and the magnetic conductive block 4 can be formed by splicing multiple magnetic conductive materials, which is convenient for processing and manufacturing. The second magnetic conductive frame 2, the first magnetic conductive frame 3 and the magnetic conductive block 4 can also be formed by vertically stacking multiple layers of magnetic conductive materials along the current direction, for example, using 0.5mm or 1mm magnetic conductive sheets to be vertically stacked, and the specific method is the same as the method disclosed in the patent document with application publication number CN117558594A, which is convenient for processing and manufacturing.

[0035] Taking the first embodiment of the present application as an example, in this embodiment, when current flows through the main circuit 1, a magnetic field is formed in the loop formed by the second magnetic conductive frame 2, the first magnetic conductive frame 3 and the top magnetic conductive block 4, and a magnetic flux is generated in the magnetic circuit, resulting in an electromagnetic attraction between the second magnetic conductive frame 2, the first magnetic conductive frame 3 and the magnetic conductive block 4. When the current flowing through the main circuit 1 is less than the tripping action current, an electromagnetic attraction is generated between the second magnetic conductive frame 2, the first magnetic conductive frame 3 and the top magnetic conductive block 4. At this time, the upward thrust exerted by the spring 6 on the magnetic conductive block 4 is greater than the electromagnetic attraction generated between the second magnetic conductive frame 2, the first magnetic conductive frame 3 and the top magnetic conductive block 4, so that the top magnetic conductive block 4 is located in the upper position, that is, the electromagnetic attraction cannot overcome the spring reaction force of the spring 6, so that the top magnetic conductive block 4 is kept in the upper position to prevent the top magnetic conductive block 4 from malfunctioning. There is a large air gap between the top magnetic conductive block 4 and the first magnetic conductive frame 3. At the same time, an electromagnetic attraction is generated between the contact surface of the magnetic frame boss 8 and the radial surface of the rotatable magnetic block 9. The spring force applied by the torsion spring 11 to the rotatable magnetic block 9 is greater than the electromagnetic attraction generated between the magnetic frame boss 8 and the rotatable magnetic block 9, that is, the electromagnetic attraction cannot overcome the spring reaction force of the torsion spring 11, so that the rotatable magnetic block 9 contacts the limit block 7, and the rotatable magnetic block 9 is in a horizontal position, preventing the rotatable magnetic block 9 from malfunctioning. At this time, the connecting rod 13 is in a horizontal position, and the connecting rod 13 contacts the travel switch 16, and the travel switch 16 can indicate that the trip device is not actuated.

[0036] When the current flowing through the main circuit 1 is greater than the tripping action current, an electromagnetic attraction is generated between the second magnetic conductive frame 2, the first magnetic conductive frame 3 and the magnetic conductive block 4. At this time, the upward thrust applied by the spring 6 to the top magnetic conductive block 4 is smaller than the electromagnetic attraction generated between the second magnetic conductive frame 2, the first magnetic conductive frame 3 and the top magnetic conductive block 4. The electromagnetic attraction overcomes the spring reaction force of the spring 6, causing the magnetic conductive block 4 to move downward. When the magnetic conductive block 4 reaches the lower position, the circuit breaker opens and the tripping action is completed. Since the magnetic flux generated in the loop is continuously increased during the downward movement of the top magnetic conductive block 4, the electromagnetic attraction generated between the magnetic conductive frame boss 8 and the rotatable magnetic conductive block 9 is also continuously increasing. The electromagnetic attraction overcomes the spring reaction force of the torsion spring 11, causing the rotatable magnetic conductive block 9 to rotate along the rotating shaft 10, so that the rotatable magnetic conductive block 9 contacts the magnetic conductive frame boss 8. In this process, as the rotatable magnetic conductive block 9 and the magnetic conductive frame boss 8 are constantly approaching, the magnetic flux generated in the loop composed of the second magnetic conductive frame 2, the first magnetic conductive frame 3 and the magnetic conductive block 4 can be increased, thereby increasing the electromagnetic attraction between the second magnetic conductive frame 2, the first magnetic conductive frame 3 and the magnetic conductive block 4, and improving the reliability and speed of the trip device. When the rotatable magnetic conductive block 9 rotates, it can drive the connecting rod 13 to slide left and right in the guide groove 15. When the rotatable magnetic conductive block 9 rotates to the contact position with the magnetic conductive frame boss 8, the connecting rod 13 is out of contact with the travel switch 16, and the travel switch 16 can indicate whether the trip device is in action.

[0037] In the description of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, if the terms "first", "second", etc. appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] The above is only a preferred specific implementation method of the present scheme, but the protection scope required by the present scheme is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical scheme and inventive concept of the present application within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A DC overcurrent tripping device, comprising a device body, the device body comprising an annular magnetic conductive frame, a top magnetic conductive block (4), a main circuit (1), and a spring (6), wherein an inclined notch is provided at the middle position of the top of the magnetic conductive frame, the top magnetic conductive block (4) has a trapezoidal cross section and is located in the notch of the magnetic conductive frame, the inclined end faces on both sides of the magnetic conductive block (4) are parallel to the inclined end faces on both sides of the notch of the magnetic conductive frame, the main circuit (1) vertically passes through the loop formed by the top magnetic conductive block (4) and the magnetic conductive frame, one end of the spring (6) is fixed to a part inside the magnetic conductive frame, and the other end is connected to the top magnetic conductive block (4), characterized in that: The device also includes a connecting rod (13) made of insulating material and a tripping device action indicator (14), wherein the tripping device action indicator (14) is connected to the device body through the connecting rod (13) and maintains an insulating distance with the device body, and the device body also includes a detachable rotatable magnetic conductive block (9) and a rotating shaft (10), wherein at least one notch perpendicular to the central axis path is provided on the annular central axis path of the magnetic conductive frame, and the rotating shaft (10) is fixedly mounted at the center of the notch perpendicular to the central axis path, and the center of the rotatable magnetic conductive block (9) is mounted on the rotating shaft (10) and rotates around the rotating shaft (10), and the notch perpendicular to the central axis path is A limiting device is also provided inside the rotatable magnetic conductive block (9) to limit the position of the rotatable magnetic conductive block (9) so that the rotatable magnetic conductive block (9) is maintained at a position perpendicular to the central axis path using a self-resetting elastic member when not tripped. A magnetic conductive frame boss (8) is provided on the inner side of a notch perpendicular to the central axis path of the magnetic conductive frame. The magnetic conductive frame boss (8) is provided with a contact surface that can be in flat contact with the radial surface of the rotatable magnetic conductive block (9). The distal end of the rotatable magnetic conductive block (9) is connected to one end of a connecting rod (13) via a connecting shaft (12). The other end of the connecting rod (13) is connected to a tripping device action indicator (14) and causes the tripping device action indicator (14) to generate a tripping signal when tripping.

2. The DC overcurrent tripping device according to claim 1, characterized in that: The tripper action indicator (14) comprises a guide groove (15) and a travel switch (16) at the end of the guide groove; the other end of the connecting rod (13) slides in the guide groove (15) and causes the travel switch (16) to generate a tripping signal when tripping occurs.

3. The DC overcurrent tripping device according to claim 1, characterized in that: Two notches perpendicular to the central axis path are arranged on the annular central axis route of the magnetic conductive frame, and rotatable magnetic conductive blocks (9) are installed in both notches, wherein one of the rotatable magnetic conductive blocks (9) is connected to a release action indicator (14).

4. The DC overcurrent tripping device according to claim 1, characterized in that: Two notches perpendicular to the central axis path are arranged on the annular central axis route of the magnetic conductive frame (7), wherein a rotatable magnetic conductive block (9) connected to the tripper action indicator (14) is installed in one of the notches, and the rotatable magnetic conductive block (9) is not installed in the other notch.

5. The DC overcurrent tripping device according to claim 1, characterized in that: The limiting device comprises a limiting block (7), and the limiting block (7) is fixedly mounted on the inner side of the notch perpendicular to the central axis path.

6. The DC overcurrent tripping device according to claim 1, characterized in that: The inclined notch of the magnetic conductive frame is larger at the top and smaller at the bottom, and the cross section of the top magnetic conductive block (4) has the upper long side at the top and the lower short side at the bottom.

7. The DC overcurrent tripping device according to claim 1, characterized in that: The magnetic conductive frame is formed by splicing a plurality of pieces of magnetic conductive materials, and the magnetic conductive frame and the top magnetic conductive block (4) are formed by vertically stacking a plurality of layers of magnetic conductive materials along the direction of current flow.

8. The DC overcurrent tripping device according to claim 1, characterized in that: The self-resetting elastic member is a compression spring or a torsion spring that bears torsional moment.

9. The DC overcurrent tripping device according to claim 1, characterized in that: The insulating material of the connecting rod (13) is epoxy resin.

10. The DC overcurrent tripping device according to claim 1, characterized in that: The direction of the current in the main circuit (1) is forward or reverse.

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