Self-driven quick circuit breaker

Abstract

The utility model relates to the technical field of circuit breakers, and discloses a self-driven quick circuit breaker, which comprises a shell, a static contact and a moving contact, the static contact and the moving contact are arranged in an inner cavity of the shell, the moving contact and the static contact are attached to each other in a normal state, the moving contact is electrically connected with a coil through a wire, a toggle plate is mounted in the inner cavity of the shell, and the toggle plate is electrically connected with the coil through a wire. A magnetic column is installed on the toggle plate, and when current in the coil is increased instantaneously, the magnetic column and the coil repel each other and drive the toggle plate to rotate, so that the moving contact is separated from the static contact, and the whole circuit breaker is in an opening state. According to the utility model, when an electrical system has a fault, the circuit can be rapidly responded and timely switched off to protect the circuit, the switching-off state is stable, and the overall power-off protection is reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a self-driven fast circuit breaker. Background Art

[0002] When a short circuit occurs in the power system, the relay protection usually collects the fault current signal, and after calculation and logical judgment, sends a trip command to control the energy storage device to drive the circuit breaker to trip and cut off the fault current. However, there are the following problems in the prior art:

[0003] 1. When a short circuit occurs, the relay protection system collects fault signals through current transformers and voltage transformers. However, current transformers and voltage transformers usually have saturation and interference in the collection lines, which will lead to inaccurate collected fault signals, misjudgment and malfunction of the circuit breaker, and greatly reduce the power supply quality.

[0004] 2. Ordinary circuit breakers need to be equipped with energy storage devices and control systems. The systems are complex and costly. The circuit breaker is located in a harsh environment with strong magnetic fields and strong electric fields. Damage to energy storage devices and control system failures often occur, resulting in problems such as circuit breaker refusal to operate and malfunction. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the utility model provides a self-driven fast circuit breaker, which solves the problem that the opening speed of the prior circuit breaker needs to be improved in the event of a short circuit fault and the stability of the power-off protection during daily use needs to be improved.

[0007] (II) Technical solution

[0008] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] A self-driven fast circuit breaker comprises a shell and a static contact and a moving contact arranged in an inner cavity of the shell. The moving contact and the static contact are in contact with each other under normal conditions. The moving contact is electrically connected to a coil through a wire. A toggle plate is installed in the inner cavity of the shell. A magnetic column is installed on the toggle plate. When the current in the coil increases instantaneously, the magnetic column and the coil repel each other and drive the toggle plate to rotate so that the moving contact is separated from the static contact, so that the entire circuit breaker is in an open state.

[0010] Preferably, a connecting frame is detachably installed in the inner cavity of the shell, the static contact is fixedly arranged on the connecting frame, the moving contact is slidingly connected to the connecting frame, a limiting groove matching the moving contact is arranged on the connecting frame, and a first elastic member is fixedly connected between the connecting frame and the moving contact to ensure that the moving contact is always in contact with the static contact under normal conditions.

[0011] Preferably, a connecting column is arranged in the inner cavity of the shell, and the dial is rotatably connected to the connecting column via a bearing.

[0012] Preferably, a plurality of weight-reducing grooves are arranged on the toggle disk, and a toggle fork and a mounting fork are respectively arranged on the toggle disk, the toggle fork is used to toggle and separate the moving contact and the static contact, and the magnetic column is mounted on the mounting fork.

[0013] Preferably, the outer sleeve of the magnetic column is fixedly connected with a mounting sleeve, and the mounting sleeve is suspended and fixedly mounted on the mounting fork through symmetrically arranged second elastic members.

[0014] Preferably, a circular track is provided on the surface of the mounting fork, a limiting hole is provided on the mounting fork at the end of the circular track, and a plug connector is arranged in the inner cavity of the shell. During the rotation of the mounting fork, the plug connector slides along the circular track and is finally inserted into the limiting hole so that the mounting fork cannot rotate.

[0015] Preferably, a maintaining handle is slidably arranged on the cavity wall of the shell, the plug connector is fixedly arranged on one end of the maintaining handle located in the inner cavity of the shell, and the maintaining handle is fixedly connected to the cavity wall of the shell via a third elastic member.

[0016] Preferably, the contact surface between the moving contact and the shift fork is configured as an inclined surface.

[0017] (III) Beneficial effects

[0018] The utility model has the following beneficial effects:

[0019] The self-driven fast circuit breaker, through the set toggle disk and magnetic column, can increase the instantaneous current in the coil when a short circuit occurs in the electrical system connected to the circuit breaker. Then, due to the magnetic repulsion, the magnetic column drives the toggle disk to rotate, so that the toggle disk toggle the moving contact and the static contact to separate, thereby completing the fast circuit breaking protection for the entire electrical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the installation structure of the maintenance handle of the utility model;

[0022] Figure 3 This is a schematic diagram of the layout structure of the inner cavity of the shell of the utility model;

[0023] Figure 4 This is a schematic diagram of the overall structure of the toggle plate of the utility model;

[0024] Figure 5 This is a schematic diagram of the circular track layout structure of the utility model.

[0025] In the figure: 1. housing; 2. connecting frame; 3. static contact; 4. moving contact; 5. first elastic member; 6. limiting groove; 7. coil; 8. connecting column; 9. bearing; 10. toggle plate; 11. weight reduction groove; 12. toggle fork; 13. mounting fork; 14. second elastic member; 15. mounting sleeve; 16. magnetic column; 17. annular track; 18. limiting hole; 19. maintaining handle; 20. third elastic member; 21. plug connector. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1 The utility model provides a technical solution: a self-driven fast circuit breaker, including a shell 1 and a static contact 3 and a moving contact 4 arranged in the inner cavity of the shell 1. The moving contact 4 and the static contact 3 are in contact with each other under normal conditions. The moving contact 4 is electrically connected to the coil 7 through a wire. A toggle plate 10 is installed in the inner cavity of the shell 1, and a magnetic column 16 is installed on the toggle plate 10. When the current in the coil 7 increases instantaneously, the magnetic column 16 and the coil 7 repel each other and drive the toggle plate 10 to rotate, so that the moving contact 4 is separated from the static contact 3, so that the entire circuit breaker is in an open state.

[0028] The utility model, through the arrangement of the toggle disk 10 and the magnetic column 16, can, when a short circuit occurs in the electrical system connected to the circuit breaker, the instantaneous current in the coil 7 increases, and then the magnetic repulsion pushes the magnetic column 16 to drive the toggle disk 10 to rotate, so that the toggle disk 10 toggle the moving contact 4 and the static contact 3 to separate, thereby completing the rapid circuit-breaking protection for the entire electrical system.

[0029] Reference Figure 1As shown, in this embodiment, the inner cavity of the housing 1 is detachably mounted with a connecting frame 2, the static contact 3 is fixedly arranged on the connecting frame 2, the moving contact 4 is connected to the connecting frame 2 in a sliding manner, the connecting frame 2 is provided with a limiting groove 6 matching the moving contact 4, and a first elastic member 5 is fixedly connected between the connecting frame 2 and the moving contact 4, which is used to ensure that the moving contact 4 is always in contact with the static contact 3 under normal conditions. Under the limiting effect of the limiting groove 6, the entire moving contact 4 can only move along the limiting groove 6, and at the same time, under the elastic support of the first elastic member 5, it is ensured that the moving contact 4 is always in contact with the static contact 3 under normal conditions and is electrically connected. At the same time, after the moving contact 4 is toggled by the toggle plate 10 and separated from the static contact 3, the first elastic member 5 is pressed and has a tendency to reset, so when the subsequent contact toggle plate 10 is limited to the moving contact 4, the moving contact 4 is reset and pushes the toggle plate 10 to reset. Therefore, there is no need to set a reset mechanism separately at the toggle plate 10.

[0030] In this embodiment, a connecting column 8 is arranged in the inner cavity of the housing 1 , and the dial 10 is rotatably connected to the connecting column 8 via a bearing 9 .

[0031] Reference Figure 2 and 4 As shown, in this embodiment, a plurality of weight-reducing grooves 11 are arranged on the toggle plate 10, and a toggle fork 12 and a mounting fork 13 are arranged on the toggle plate 10, respectively. The toggle fork 12 is used to toggle and separate the moving contact 4 and the stationary contact 3, and the magnetic column 16 is mounted on the mounting fork 13. The weight-reducing grooves 11 arranged on the toggle plate 10 can effectively reduce the counterweight of the entire toggle plate 10, so as to save the subsequent layout cost of the coil 7, and also facilitate reducing the thrust required for the rotation of the toggle plate 10, so as to improve the sensitivity of the entire circuit breaker; the forked mounting fork 13 and the toggle fork 12 can further reduce the counterweight.

[0032] Reference Figure 4 As shown, in this embodiment, the outer sleeve of the magnetic column 16 is fixedly connected with the mounting sleeve 15, and the mounting sleeve 15 is suspended and fixedly mounted on the mounting fork 13 through the symmetrically arranged second elastic members 14. In the process of the coil 7 pushing the magnetic column 16 to move due to the mutual repulsion of the different shapes, the magnetic column 16 drives the toggle plate 10 to rotate through the mounting fork 13, and then the toggle fork 12 drives the moving contact 4 to separate from the static contact 3. At this time, due to the deadweight of the magnetic column 16 and the mounting sleeve 15, the magnetic column 16 and the mounting sleeve 15 can twist the second elastic member 14 and be in a vertical state, so as to ensure that the thrust generated between the coil 7 and the magnetic column 16 is stable.

[0033] Reference Figure 5As shown, in this embodiment, the surface of the mounting fork 13 is provided with an annular track 17, and a limiting hole 18 is provided on the mounting fork 13 at the end of the annular track 17. A plug connector 21 is arranged in the inner cavity of the housing 1. During the rotation of the mounting fork 13, the plug connector 21 slides along the annular track 17 and is finally inserted into the limiting hole 18 so that the mounting fork 13 cannot rotate. During the rotation of the dial 10 pushed by the mounting fork 13, the plug connector 21 can slide along the annular track 17, and after the mounting fork 13 pushes the moving contact 4 to slide along the limiting groove 6 and separate from the static contact 3, the plug connector 21 is inserted into the limiting hole 18 to limit the mounting fork 13 and ensure the stable maintenance of the circuit breaker protection state.

[0034] Reference Figure 2 As shown, in this embodiment, a maintenance handle 19 is arranged on the cavity wall of the housing 1 to slide through, and a plug connector 21 is fixedly arranged at one end of the maintenance handle 19 located in the inner cavity of the housing 1, and the maintenance handle 19 is fixedly connected to the cavity wall of the housing 1 through a third elastic member 20. During the movement of the plug connector 21 along the annular track 17, the third elastic member 20 is always in a compressed state. When the plug connector 21 moves to the limiting hole 18, the third elastic member 20 is reset at this time, so that the plug connector 21 is stably inserted into the limiting hole 18, thereby ensuring that the entire circuit breaker is stably in the open state. In addition, when it is necessary to restore the closed state, the personnel can pull the maintenance handle 19 to make the compressed plug connector 21 of the third elastic member 20 disengage from the limiting hole 18. At this time, under the reset action of the first elastic member 5, the moving contact 4 is driven to push the toggle fork 12, and then the toggle disk 10 is restored to the initial state, thereby completing the reset of the entire circuit breaker.

[0035] Reference Figure 4 As shown, in this embodiment, the contact surface between the moving contact 4 and the toggle fork 12 is set as an inclined surface. Due to the inclined surface set on the moving contact 4, when the toggle fork 12 obliquely pushes the moving contact 4 during the rotation process, under the action of the inclined surface, the moving contact 4 can stably slide along the limit groove 6, avoiding the force balance state between the moving contact 4 and the toggle fork 12, which affects the normal opening of the moving contact 4.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-driven fast circuit breaker, comprising a housing and a stationary contact and a moving contact arranged in an inner cavity of the housing, characterized in that: The moving contact and the static contact are normally in contact with each other, the moving contact is electrically connected to the coil through a wire, a toggle disk is installed in the inner cavity of the shell, and a magnetic column is installed on the toggle disk. When the current in the coil increases instantaneously, the magnetic column and the coil repel each other and drive the toggle disk to rotate, so that the moving contact is separated from the static contact, so that the entire circuit breaker is in an open state.

2. A self-driven fast circuit breaker according to claim 1, characterized in that: A connecting frame is detachably installed in the inner cavity of the shell, the static contact is fixedly arranged on the connecting frame, the moving contact is slidably connected to the connecting frame, a limiting groove matching the moving contact is arranged on the connecting frame, and a first elastic member is fixedly connected between the connecting frame and the moving contact to ensure that the moving contact is always in contact with the static contact under normal conditions.

3. A self-driven fast circuit breaker according to claim 2, characterized in that: A connecting column is arranged in the inner cavity of the shell, and the dial is rotatably connected to the connecting column via a bearing.

4. A self-driven fast circuit breaker according to claim 1 or 3, characterized in that: The toggle plate is provided with a plurality of weight-reducing grooves, and the toggle plate is provided with a toggle fork and a mounting fork, respectively. The toggle fork is used to toggle and separate the moving contact and the static contact, and the magnetic column is mounted on the mounting fork.

5. A self-driven fast circuit breaker according to claim 4, characterized in that: The outer sleeve of the magnetic column is fixedly connected with a mounting sleeve, and the mounting sleeve is suspended and fixedly mounted on the mounting fork through symmetrically arranged second elastic members.

6. A self-driven fast circuit breaker according to claim 4, characterized in that: The surface of the mounting fork is provided with an annular track, and a limiting hole is provided on the mounting fork at the end of the annular track. A plug connector is arranged in the inner cavity of the shell. During the rotation of the mounting fork, the plug connector slides along the annular track and is finally inserted into the limiting hole so that the mounting fork cannot rotate.

7. A self-driven fast circuit breaker according to claim 6, characterized in that: A maintenance handle is slidably arranged on the cavity wall of the shell, and the plug connector is fixedly arranged on one end of the maintenance handle located in the inner cavity of the shell. The maintenance handle is fixedly connected to the cavity wall of the shell through a third elastic member.

8. A self-driven fast circuit breaker according to claim 6, characterized in that: The contact surface between the moving contact and the shift fork is configured as an inclined surface.

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