Manual opening structure of permanent magnet circuit breaker

Abstract

The utility model provides a manual opening structure of a permanent magnet circuit breaker, and belongs to the technical field of mechanism assembly of high-voltage circuit breakers. Comprising a circuit breaker cabinet body, a permanent magnetic mechanism is arranged in the circuit breaker cabinet body, a guide plate is fixed on the inner wall of the circuit breaker cabinet body, a fixed plate of the permanent magnetic mechanism is in sliding connection with the guide plate, a fixed bent plate is arranged on the inner wall of the circuit breaker cabinet body, and an emergency opening shaft is rotatably supported on the circuit breaker cabinet body and the fixed bent plate. One end of the emergency opening shaft extends out of the circuit breaker cabinet body, the other end of the emergency opening shaft is connected with a connecting rod crank arm structure, the emergency opening shaft rotates clockwise under the action of external operating force, opening force is transmitted to a fixing plate of the permanent magnetic mechanism through the connecting rod crank arm structure, closing holding force of the permanent magnetic mechanism is broken, and opening is achieved. According to the utility model, by optimizing the structural design, the opening torque is reduced, so that the manual emergency opening operation can be easily realized outside the cabinet body, and the operation reliability is improved at the same time.

Description

Technical Field

[0001] This utility model belongs to the field of high-voltage circuit breaker mechanism assembly technology, specifically relating to a manual tripping structure for a permanent magnet circuit breaker, which is used to improve assembly efficiency, enhance product quality, and optimize manual emergency tripping operation during circuit breaker mechanism assembly. Background Technology

[0002] High-voltage circuit breakers play a crucial role in the protection and control of power equipment against overload and short circuits in high-voltage power supply and distribution systems. As protection and control units in power grid equipment, coal mines, and industrial and mining enterprises, circuit breakers are suitable for switching various types of loads, frequent operations, and multiple short-circuit current interruptions. After normal closing, mining high-voltage circuit breakers (permanent magnet mechanism + spring mechanism) require manual emergency tripping outside the cabinet. However, existing manual emergency tripping structures suffer from excessive tripping torque (up to 70 N·m), making the operation of the external tripping interlocking mechanism difficult, resulting in low tripping efficiency, and even potentially failing to trip in time due to insufficient operating force, thus affecting the safety and reliability of the power system. Therefore, there is an urgent need to design a new emergency tripping structure to reduce the tripping torque, facilitate external tripping interlocking design, and improve the convenience and reliability of tripping operations. Utility Model Content

[0003] The technical problem solved by this utility model is to provide a manual tripping structure for a permanent magnet circuit breaker. This utility model reduces the tripping torque by optimizing the structural design, making it easy to perform manual emergency tripping operations outside the cabinet, while improving the reliability of the operation.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] The manual tripping structure of a permanent magnet circuit breaker includes a circuit breaker cabinet. A permanent magnet mechanism is installed inside the cabinet. A guide plate is fixed to the inner wall of the cabinet. The fixed plate of the permanent magnet mechanism is slidably connected to the guide plate. A fixed bent plate is provided on the inner wall of the cabinet. An emergency tripping shaft is rotatably supported on the cabinet and the fixed bent plate. One end of the emergency tripping shaft extends outside the cabinet, and the other end is connected to a linkage crank arm structure. Under external operating force, the emergency tripping shaft rotates clockwise, transmitting the tripping force to the fixed plate of the permanent magnet mechanism through the linkage crank arm structure, breaking the closing holding force of the permanent magnet mechanism and achieving tripping.

[0006] Further defining the above scheme, the linkage crank arm structure includes crank arm I, connecting plate, pin I, pin II, and crank arm II. One end of crank arm I is fixedly connected to the emergency tripping shaft, and the other end of crank arm I is hinged to one end of the connecting plate. The other end of the connecting plate is hinged to one end of crank arm II via pin I. Pin I is slidably disposed in the curved hole on the fixed bending plate. Crank arm II is connected to the fixed bending plate via pin II, and the other end of crank arm II is located at the lower part of the fixed plate.

[0007] Further specifying the above scheme, the crank arm I is a straight crank arm, and the crank arm II is a clamp-type crank arm.

[0008] Further specifying the above scheme, the rotational tripping torque of the emergency tripping shaft is less than or equal to 20 N·m.

[0009] Further defining the above scheme, a limiting crank arm is fixedly connected to the emergency trip shaft, and a limiting screw is fixedly connected to the lower end of the limiting crank arm. The limiting screw contacts the circuit breaker cabinet to limit the rotation angle of the emergency trip shaft.

[0010] As a further limitation of the above scheme, the emergency tripping shaft is rotatably supported on the circuit breaker cabinet and the fixed bending plate by a copper sleeve.

[0011] As a further limitation of the above scheme, the copper sleeve is made of a self-lubricating material.

[0012] Advantages of this utility model compared to the prior art:

[0013] 1. This solution reduces the tripping torque: By optimizing the structural design, the tripping torque is reduced from 70 N·m to 20 N·m, which greatly reduces the operating force and improves the convenience of tripping.

[0014] 2. This solution is reliable in operation: it has a simple structure, is easy to install, and the tripping operation is more reliable, making it suitable for rapid tripping in emergency situations;

[0015] 3. This solution has a wide range of applications: it can be adapted to clamp-type crank arms or straight crank arms, making it easy to design the linkage crank arm structure according to actual needs;

[0016] 4. This solution extends service life: The use of copper sleeves reduces frictional wear on the emergency trip shaft, thus extending the service life of the mechanism. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention when it is in the closed position;

[0018] Figure 2 This utility model Figure 1 A schematic diagram of the connecting rod crank arm structure shown in direction A;

[0019] Figure 3 This utility model Figure 1 A schematic diagram of the emergency trip shaft shown in the C-direction;

[0020] Figure 4 This is a schematic diagram of the structure of this utility model when it is in the open position;

[0021] Figure 5 This utility model Figure 4 A schematic diagram of the connecting rod crank arm structure shown in direction B. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] Please see Figure 1-5 The embodiments of this utility model are described in detail below.

[0026] Example 1: See Figure 1 As shown, the manual tripping structure of the permanent magnet circuit breaker includes a circuit breaker cabinet 1. The circuit breaker cabinet 1 is equipped with a permanent magnet mechanism 4. A guide plate 3 is fixed on the inner wall of the circuit breaker cabinet 1. The fixing plate 2 of the permanent magnet mechanism 4 is slidably connected to the guide plate 3 to guide the movement trajectory of the moving parts.

[0027] The circuit breaker cabinet 1 has a fixed bending plate 9 on its inner wall. The circuit breaker cabinet 1 and the fixed bending plate 9 are rotatably supported by an emergency tripping shaft 5 via a copper sleeve 6. Preferably, the copper sleeve 6 is made of a self-lubricating material (such as a graphite copper sleeve) to reduce frictional resistance during rotation.

[0028] One end of the emergency tripping shaft 5 extends to the outside of the circuit breaker cabinet 1, and the other end of the emergency tripping shaft 5 is connected to a connecting rod crank arm structure. Under the action of external operating force, the emergency tripping shaft 5 rotates clockwise and transmits the tripping force to the fixed plate 2 of the permanent magnet mechanism 4 through the connecting rod crank arm structure, thereby breaking the closing holding force of the permanent magnet mechanism and realizing the tripping.

[0029] In one specific implementation, see Figure 2 As shown, the linkage crank arm structure includes crank arm I10, connecting plate 11, pin I12, pin II14 and crank arm II15. One end of crank arm I10 is fixedly connected to the emergency tripping shaft 5, and the other end of crank arm I10 is hinged to one end of connecting plate 11. The other end of connecting plate 11 is hinged to one end of crank arm II15 through pin I12. Pin I12 is slidably disposed in the curved hole 13 on the fixed bending plate 9. Crank arm II15 is connected to the fixed bending plate 9 through pin II14, and the other end of crank arm II15 is located at the lower part of the fixed plate 2.

[0030] Preferably, the crank arm I10 is a straight crank arm, and the crank arm II15 is a clamp-type crank arm.

[0031] In this embodiment, when the emergency tripping shaft 5 rotates, it drives the crank arm I10 to rotate. The crank arm I10 drives the pin shaft I12 to move along the curved hole 13 through the connecting plate 11. The pin shaft I12 drives the crank arm II15 to rotate. One end of the crank arm II15 rotates and pushes against the fixing plate 2 of the permanent magnet mechanism 4 to move linearly.

[0032] The above structure enables the rotational tripping torque of the emergency tripping shaft 5 to be less than or equal to 20 N·m.

[0033] Example 2: A limiting crank arm 7 is fixedly connected to the emergency trip shaft 5. A limiting screw 8 is fixedly connected to the lower end of the limiting crank arm 7. The limiting screw 8 contacts the circuit breaker cabinet 1 to limit the rotation angle of the emergency trip shaft 5. The limiting crank arm 7 is used to limit the range of motion of the emergency trip shaft 5 and prevent excessive rotation.

[0034] Working principle: See Figure 1-5 As shown, rotating the emergency trip shaft 5 clockwise outside the circuit breaker cabinet 1 transmits the tripping force to the fixed plate 2 of the permanent magnet mechanism 4, breaking the closing holding force of the permanent magnet mechanism 4. Under the combined action of the tripping spring and the contact spring, the moving iron core returns to the tripping position and remains in the tripping state. Figure 4-5 As shown.

[0035] The optimized emergency tripping structure of this utility model is simple in structure, reliable and convenient to install, requires little manual tripping force, facilitates cabinet design, and is easy to operate.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A manual tripping structure for a permanent magnet circuit breaker, comprising a circuit breaker cabinet (1), wherein a permanent magnet mechanism (4) is provided inside the circuit breaker cabinet (1), and a guide plate (3) is fixed on the inner wall of the circuit breaker cabinet (1), wherein the fixing plate (2) of the permanent magnet mechanism (4) is slidably connected to the guide plate (3), characterized in that: The inner wall of the circuit breaker cabinet (1) is provided with a fixed bending plate (9). An emergency tripping shaft (5) is rotatably supported on the circuit breaker cabinet (1) and the fixed bending plate (9). One end of the emergency tripping shaft (5) extends to the outside of the circuit breaker cabinet (1), and the other end of the emergency tripping shaft (5) is connected to a connecting rod crank arm structure. Under the action of external operating force, the emergency tripping shaft (5) rotates clockwise and transmits the tripping force to the fixed plate (2) of the permanent magnet mechanism (4) through the connecting rod crank arm structure, thereby breaking the closing holding force of the permanent magnet mechanism and realizing the tripping.

2. The manual tripping structure of the permanent magnet circuit breaker according to claim 1, characterized in that: The connecting rod crank arm structure includes crank arm I (10), connecting plate (11), pin I (12), pin II (14) and crank arm II (15). One end of crank arm I (10) is fixedly connected to the emergency tripping shaft (5), and the other end of crank arm I (10) is hinged to one end of connecting plate (11). The other end of connecting plate (11) is hinged to one end of crank arm II (15) through pin I (12). Pin I (12) is slidably disposed in the curved hole (13) on the fixed bending plate (9). Crank arm II (15) is connected to the fixed bending plate (9) through pin II (14). The other end of crank arm II (15) is located at the lower part of the fixed plate (2).

3. The manual tripping structure for a permanent magnet circuit breaker according to claim 2, characterized in that: The crank arm I (10) is a straight crank arm, and the crank arm II (15) is a clamp-type crank arm.

4. The manual tripping structure of the permanent magnet circuit breaker according to claim 2, characterized in that: The rotation torque of the emergency tripping shaft (5) is less than or equal to 20 N·m.

5. The manual tripping structure of the permanent magnet circuit breaker according to claim 1, characterized in that: A limiting crank arm (7) is fixedly connected to the emergency trip shaft (5), and a limiting screw (8) is fixedly connected to the lower end of the limiting crank arm (7). The limiting screw (8) contacts the circuit breaker cabinet (1) to limit the rotation angle of the emergency trip shaft (5).

6. The manual tripping structure of the permanent magnet circuit breaker according to claim 1, characterized in that: The emergency trip shaft (5) is rotatably supported on the circuit breaker cabinet (1) and the fixed bend plate (9) by a copper sleeve (6).

7. The manual tripping structure of the permanent magnet circuit breaker according to claim 6, characterized in that: The copper sleeve (6) is made of a self-lubricating material.

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