Single-phase permanent magnet operating mechanism for circuit breaker

Abstract

The utility model relates to a single-phase permanent magnet operating mechanism for a circuit breaker. The utility model comprises a static iron core which is provided with a mounting groove; a plurality of permanent magnets surrounding the static iron core are mounted in the magnetic cylinder; the movable iron core is arranged relative to the static iron core, the movable iron core is provided with a stepped hole with an opening, and the movable iron core is connected with an insulating pull rod connected with the movable end of the arc extinguish chamber in the pole; the two ends of the pressure spring abut against the mounting groove and the stepped hole respectively so as to provide force for the movable iron core to be far away from the static iron core; and the coil framework is arranged between the static iron core and the permanent magnet, a coil is wound on the coil framework, and one end, far away from the movable end of the arc extinguish chamber, of the insulating pull rod sequentially penetrates through the stepped hole and the pressure spring and is connected with a connecting nut. The utility model has the advantages of compact structure and reasonable layout, and can meet the requirements of quick breaking of the circuit breaker, adaptation to the installation environment with limited space and power grid protection.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a single-phase permanent magnetic operating mechanism for circuit breakers. Background Art

[0002] Vacuum circuit breakers have been widely developed in the field of power distribution and have gradually gained a dominant position. At present, mainstream vacuum circuit breakers basically use spring energy storage operating mechanisms. However, compared with spring energy storage operating mechanisms, the output characteristics of permanent magnetic operating mechanisms are more consistent with the requirements of arc extinguishing chambers and are more suitable for the operation requirements of high-voltage AC circuit breaking. In addition, the mechanical structure of the permanent magnetic mechanism circuit breaker is extremely simple, and the number of parts is only about 50% of the number of parts of the traditional spring operating mechanism, and the movable parts are reduced to only a few. Since the possibility of circuit breaker failure increases with the increase in the number of its separable parts, mechanical failures constitute the main part of all circuit breaker failures, so the permanent magnetic mechanism also has the characteristics of a small number of parts, low failure rate, and long service life.

[0003] In recent years, the demand for vacuum circuit breakers equipped with permanent magnetic actuators has also grown rapidly. Although the existing permanent magnetic actuators are more compatible with the requirements of the arc extinguishing chamber in terms of output characteristics, their structure is not compact enough, which affects the overall performance of the equipment and the flexibility of application. Summary of the invention

[0004] To this end, the utility model provides a single-phase permanent magnetic operating mechanism for a circuit breaker, which has a compact structure and a reasonable layout, and can meet the requirements of fast disconnection of the circuit breaker, adapting to an installation environment with limited space, and protecting the power grid.

[0005] In order to solve the above technical problems, the utility model provides a single-phase permanent magnetic operating mechanism for a circuit breaker, which is installed in a circuit breaker housing connected to a pole, and the pole is provided with an arc extinguishing chamber. The permanent magnetic operating mechanism includes:

[0006] The static iron core is provided with a mounting groove;

[0007] A magnetic cylinder, in which a plurality of permanent magnets surrounding the static iron core are installed;

[0008] A moving iron core is arranged relative to the static iron core, the moving iron core is provided with a step hole with an opening, and the moving iron core is connected to an insulating pull rod connected to the moving end of the arc extinguishing chamber in the pole;

[0009] A compression spring, two ends of which are respectively against the mounting groove and the step hole to provide a force for the moving iron core to move away from the static iron core;

[0010] A coil frame is arranged between the static iron core and the permanent magnet, and a coil is wound around the coil frame;

[0011] Wherein, a connecting nut is provided at one end of the moving iron core relative to the mounting groove, and one end of the insulating pull rod away from the moving end of the arc extinguishing chamber passes through the step hole and the compression spring in sequence and is connected to the connecting nut;

[0012] By passing currents in different directions through the coil, a positive electromagnetic force can be generated between the magnetic cylinder and the coil to enable the moving iron core to overcome the force of the compression spring in the opening direction, or a reverse electromagnetic force can be generated to repel the moving iron core and the static iron core.

[0013] In one embodiment of the utility model, it also includes a static iron core bottom plate connected to the circuit breaker housing and used to install the static iron core, and the static iron core bottom plate is installed with studs connecting the static iron core and the coil frame.

[0014] In one embodiment of the utility model, the inner wall of the magnetic cylinder is provided with a first supporting step, the coil frame is provided with a second supporting step on one side of the first supporting step, and a plurality of permanent magnets are evenly distributed on the first supporting step and the second supporting step.

[0015] In one implementation of the utility model, the moving iron core is provided with a clearance groove which is gap-matched with the coil frame.

[0016] In one embodiment of the utility model, a positioning pin is installed at one end of the magnetic cylinder facing the moving iron core, and the moving iron core is provided with a guide hole that cooperates with the positioning pin for movable guidance.

[0017] In one implementation of the utility model, the moving iron core is connected to the limiting bottom plate via a limiting column.

[0018] In one embodiment of the present invention, the coil is a copper enameled wire.

[0019] The above technical solution of the utility model has the following advantages compared with the prior art:

[0020] The utility model discloses a single-phase permanent magnet operating mechanism for a circuit breaker, with a close fit design between a moving iron core and a stationary iron core and a reasonable layout between a coil frame and a permanent magnet, which significantly improves the integration of components and reduces the occupied volume; the moving iron core is provided with a step hole, and a mounting groove, a clearance groove and a guide hole reduce the need for additional components, and the integrated design maximizes the use of the internal space, enhances the compactness of the structure, reduces the volume, and better adapts to installation environments with limited space. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0022] Figure 1 It is a cross-sectional view of the permanent magnetic operating mechanism of the utility model.

[0023] Figure 2 It is a diagram of the opening position of the permanent magnetic operating mechanism of the utility model.

[0024] Figure 3 It is a closing position diagram of the permanent magnetic operating mechanism of the utility model.

[0025] Figure 4 It is a schematic diagram of the permanent magnetic operating mechanism of the utility model being connected to a pole.

[0026] Description of the Figures in the Specification:

[0027] 1. Stationary iron core bottom plate; 2. Stationary iron core; 3. Permanent magnet; 4. Magnetic cylinder; 5. Coil frame; 6. Coil; 7. Guide pin; 8. Moving iron core; 9. Compression spring; 10. Connecting nut; 11. Limiting pillar; 12. Limiting plate; 13. Moving end of arc extinguishing chamber; 14. Insulating pull rod; 15. Circuit breaker housing. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0029] In the present invention, if directions (up, down, left, right, front and back) are described, it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0030] In the present utility model, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present utility model, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0032] Reference Figure 1 , Figure 4 As shown, a single-phase permanent magnetic operating mechanism for a circuit breaker of the utility model is installed in a circuit breaker housing 15 connected to a pole, and the pole is provided with an arc extinguishing chamber. The permanent magnetic operating mechanism includes:

[0033] The static iron core 2 is provided with a mounting groove;

[0034] A magnetic cylinder 4, in which a plurality of permanent magnets 3 surrounding the static iron core 2 are installed;

[0035] A moving iron core 8 is arranged relative to the stationary iron core 2, the moving iron core 8 is provided with a step hole with an opening, and the moving iron core 8 is connected to an insulating pull rod 14 connected to a moving end 13 of the arc extinguishing chamber in the pole;

[0036] A compression spring 9, two ends of which are respectively against the mounting groove and the step hole to provide a force for the moving iron core 8 to move away from the static iron core 2;

[0037] A coil frame 5 is arranged between the static iron core 2 and the permanent magnet 3, and a coil 6 is wound around the coil frame 5;

[0038] The moving iron core 8 is provided with a connecting nut 10 at one end opposite to the mounting groove, and the end of the insulating pull rod 14 away from the moving end 13 of the arc extinguishing chamber passes through the step hole and the compression spring 9 in sequence and is connected to the connecting nut 10;

[0039] By passing currents in different directions into the coil 6, a positive electromagnetic force can be generated between the magnetic cylinder 4 and the coil 6 to enable the moving iron core 8 to overcome the force of the compression spring 9 in the opening direction, or a reverse electromagnetic force can be generated to repel the moving iron core 8 and the static iron core 2.

[0040] The use of the connecting nut 10 can achieve a firm connection between the moving iron core 8 and the insulating rod 14, reduce the loose connection caused by mechanical vibration or operating load, and improve the reliability of operation; the use of threaded connection simplifies the assembly and disassembly steps, so that on-site maintenance work can be performed quickly and conveniently, which helps to reduce maintenance costs; the insulating rod 14 is directly connected to the moving iron core 8, which can effectively transmit the operating force and reaction force to ensure that the opening and closing actions of the circuit breaker are accurate; the connecting nut 10 can be adjusted as needed to ensure the centering and prestressing of the insulating rod 14 and the moving iron core 8; the design of passing the compression spring 9 through the step hole and directly connecting with the connecting nut 10 simplifies the structure, optimizes space utilization, and makes the mechanism more compact.

[0041] In some embodiments, a static iron core bottom plate 1 connected to the circuit breaker housing 15 and used to install the static iron core 2 is further included, and the static iron core bottom plate 1 is installed with studs connecting the static iron core 2 to the coil frame 5. The static iron core bottom plate 1 fixes the static iron core 2 to the coil frame 5 through the studs, which simplifies the connection method, makes installation more convenient, and reduces the need for additional space.

[0042] In some embodiments, the inner wall of the magnetic cylinder 4 is provided with a first supporting step, the coil skeleton 5 is provided with a second supporting step on one side of the first supporting step, and a plurality of the permanent magnets 3 are evenly distributed on the first supporting step and the second supporting step. The inner wall of the magnetic cylinder is provided with a first supporting step, and together with the second supporting step, the coil skeleton 5 is supported. This design increases the stability of the coil skeleton 5 and ensures the even distribution of the permanent magnets 3.

[0043] In some embodiments, the moving iron core 8 is provided with a clearance groove that is in clearance with the coil frame 5. The clearance groove on the moving iron core 8 is in clearance with the coil frame 5, and the positioning pin and the guide hole are used in coordination, so that the moving iron core 8 has good guidance and positioning during operation, ensuring smooth movement.

[0044] In some embodiments, a positioning pin is installed at one end of the magnetic cylinder 4 facing the moving iron core 8, and the moving iron core 8 is provided with a guide hole that cooperates with the positioning pin for movable guidance.

[0045] In some embodiments, the moving iron core 8 is connected to the limiting bottom plate through four limiting columns.

[0046] In one embodiment of the present invention, the coil 6 is a copper enameled wire. By selecting a copper enameled wire with a specific wire diameter and a dense number of turns, the resistance of the coil 6 is reduced, thereby reducing power consumption and being adaptable to a 5W low-power controller.

[0047] Working principle: The permanent magnet operating mechanism is fixed in the circuit breaker housing 15 through the static iron core bottom plate 1, and the connecting nut 10 is connected to the moving end 13 (moving contact) of the arc extinguishing chamber through the insulating pull rod 14. Under the action of the compression spring 9, the initial state of the operating mechanism is as follows Figure 2 When a positive current flows through the coil 6, a positive electromagnetic force is generated between the magnetic cylinder 4 and the coil 6. This electromagnetic force overcomes the force of the compression spring 9 in the opening direction and attracts the moving iron core 8 to the static iron core 2. Figure 3 The mechanism is in the closed position. At this time, a closed magnetic circuit is formed between the magnetic cylinder 4, the permanent magnet 3 and the moving iron core 8, so that the mechanism is kept in the closed position. When a negative current passes through the coil 6, a reverse electromagnetic force is generated between the magnetic cylinder 4 and the coil 6. This electromagnetic force overcomes the holding force formed by the closed magnetic circuit and repels the moving iron core 8 from the static iron core 2. When the two are repelled by a certain distance L, the suction force generated by the closed magnetic circuit disappears, and the moving iron core 8 is pushed to the opening direction by the force of the compression spring 9. Figure 2 The mechanism is in the open position and remains in this position.

[0048] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A single-phase permanent magnetic operating mechanism for a circuit breaker, installed in a circuit breaker housing (15) connected to a pole, wherein the pole is provided with an arc extinguishing chamber, characterized in that: The permanent magnetic operating mechanism comprises: The static iron core (2) is provided with a mounting groove; A magnetic cylinder (4) having a plurality of permanent magnets (3) mounted therein and arranged around the static iron core (2); A moving iron core (8) is arranged relative to the stationary iron core (2), the moving iron core (8) being provided with a stepped hole with an opening, and the moving iron core (8) being connected to an insulating pull rod (14) connected to a moving end (13) of an arc extinguishing chamber in the pole; A compression spring (9), two ends of which respectively abut against the mounting groove and the step hole to provide a force for moving the moving iron core (8) away from the stationary iron core (2); A coil frame (5) is arranged between the static iron core (2) and the permanent magnet (3), and a coil (6) is wound around the coil frame (5); The movable iron core (8) is provided with a connecting nut (10) at one end opposite to the mounting groove, and the end of the insulating pull rod (14) away from the movable end (13) of the arc extinguishing chamber passes through the step hole and the compression spring (9) in sequence and is connected to the connecting nut (10); By passing currents in different directions through the coil (6), a positive electromagnetic force can be generated between the magnetic cylinder (4) and the coil (6) to enable the moving iron core (8) to overcome the force of the compression spring (9) in the opening direction, or a reverse electromagnetic force can be generated to repel the moving iron core (8) and the static iron core (2).

2. A single-phase permanent magnetic operating mechanism for a circuit breaker according to claim 1, characterized in that: It also comprises a static iron core bottom plate (1) connected to the circuit breaker housing (15) and used for mounting the static iron core (2), wherein the static iron core bottom plate (1) is mounted with studs for connecting the static iron core (2) to the coil frame (5).

3. The single-phase permanent magnetic operating mechanism for a circuit breaker according to claim 1, characterized in that: The inner wall of the magnetic cylinder (4) is provided with a first supporting step, the coil frame (5) is provided with a second supporting step on one side of the first supporting step, and a plurality of permanent magnets (3) are evenly distributed on the first supporting step and the second supporting step.

4. A single-phase permanent magnetic operating mechanism for a circuit breaker according to claim 1, characterized in that: The moving iron core (8) is provided with a clearance groove which is clearance-matched with the coil frame (5).

5. The single-phase permanent magnetic operating mechanism for a circuit breaker according to claim 1, characterized in that: A positioning pin is mounted on one end of the magnetic cylinder (4) facing the moving iron core (8), and the moving iron core (8) is provided with a guide hole that cooperates with the positioning pin for movable guidance.

6. The single-phase permanent magnetic operating mechanism for a circuit breaker according to claim 1, characterized in that: The moving iron core (8) is connected to the limiting bottom plate via a limiting column.

7. The single-phase permanent magnetic operating mechanism for a circuit breaker according to claim 1, characterized in that: The coil (6) is a copper enameled wire.

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