Permanent magnetic mechanism adaptive to 50kA circuit breaker

Abstract

The utility model discloses a permanent magnetic mechanism adaptive to a 50kA circuit breaker, which is assembled on symmetrical bending plates in the circuit breaker, and is internally provided with a driving rod which moves along the axial direction of the permanent magnetic mechanism. According to the utility model, the external diameter of the permanent magnetic mechanism is increased in accordance with the increase of the breaking current of the circuit breaker, and the anti-impact member is arranged at the connection position of the permanent magnetic mechanism and the bending plate. The anti-impact component comprises buffer grooves and buffer pads, wherein the buffer grooves are formed in the inner wall of the bent plate on each side and movably embedded into the side edge of the assembly plate, and the buffer pads are arranged on the upper portion and the lower portion of the inner side of each buffer groove and attached to the assembly plate. According to the permanent magnetic mechanism, the outer diameter is increased, and the coil and the iron core in the permanent magnetic mechanism are synchronously optimized, so that the width of a circuit breaker and the width of a switch cabinet are not increased on the basis of meeting 50kA short-circuit breaking current. And the impact effect increased during short circuit is effectively buffered through the arranged anti-impact component, so that the protection effect on the permanent magnetic mechanism in the action process is realized.

Description

Technical Field

[0001] This application relates to the technical field of permanent magnet circuit breakers, and particularly to a permanent magnet mechanism adapted to a 50kA circuit breaker. Background Art

[0002] A permanent magnet mechanism circuit breaker is a circuit breaker that uses a permanent magnet operating mechanism for operation. Its working principle is mainly based on the magnetic force of permanent magnets to drive the opening and closing operations of the circuit breaker. The structure is as shown in the attached Figure 1 description. Its advantages such as simple structure, few components, low failure rate, and stable opening and closing time enable it to exhibit excellent performance in various application scenarios.

[0003] For existing indoor permanent magnet mechanism circuit breakers, when the short-circuit breaking current reaches 50kA and above, a relatively large suction force (not less than 8000N) is required for the permanent magnet mechanism. The usual method is to increase the width of the circuit breaker. As shown in the attached Figure 1 description, the phase spacing is adjusted from 210mm to 275mm. Although it can meet the 50kA short-circuit breaking current, after the width of the circuit breaker increases, it can only be adapted to a 1000mm-wide switch cabinet. Generally, for a rated current of 1600A and below, although the short-circuit breaking current also needs to meet 50kA, the width of the switch cabinet is usually 800mm. Increasing the width of the switch cabinet leads to an increase in the overall cost. And first, to meet the 50kA short-circuit breaking current, and after the width of the circuit breaker increases, usually only a 1000mm-wide switch cabinet can be used instead, resulting in an increase in the costs of both the circuit breaker and the switch cabinet. Summary of the Invention

[0004] In view of the above problems, this application aims to provide a permanent magnet mechanism adapted to a 50kA circuit breaker, which increases the outer diameter of the permanent magnet mechanism and simultaneously optimizes the coil and iron core in the permanent magnet mechanism synchronously, so that on the basis of meeting the 50kA short-circuit breaking current, the width of the circuit breaker and the switch cabinet is not increased.

[0005] To achieve the above object, the technical solution adopted in this application is as follows: A permanent magnet mechanism adapted to a 50kA circuit breaker is assembled on the symmetrical bent plates inside the circuit breaker. The permanent magnet mechanism has a driving rod that moves axially along it. It is characterized in that the outer diameter of the permanent magnet mechanism is increased in line with the increase of the circuit breaker breaking current, and an anti-impact member is provided at the connection position between the permanent magnet mechanism and the bent plate.

[0006] Preferably, the increased size of the outer diameter of the permanent magnet mechanism is 12mm.

[0007] Preferably, an assembly plate for fixedly assembling the permanent magnet mechanism is provided on the symmetric bending plates. The shock-proof member includes buffer grooves movably embedded in the side edges of the assembly plate on the inner walls of the bending plates on each side, and buffer pads are arranged on the upper and lower sides inside each buffer groove and are attached to the assembly plate.

[0008] Preferably, arc-shaped surfaces are arranged on the upper and lower sides of the side wall of the assembly plate.

[0009] The beneficial effect of this application is that the outer diameter of the permanent magnet mechanism is increased, and at the same time, the inner coil and the iron core are synchronously optimized, so that on the basis of meeting the short-circuit breaking current of 50 kA, the width of the circuit breaker and the width of the switch cabinet are not increased.

[0010] The shock-proof member provided can effectively buffer the increased impact during short circuit, so as to protect the permanent magnet mechanism during its operation. Description of the Drawings

[0011] Figure 1 It is the structure of a circuit breaker with the phase spacing increased to 275 mm to meet the short-circuit breaking current of 50 kA at present.

[0012] Figure 2 It is the structure of a circuit breaker with a permanent magnet mechanism for increasing the phase spacing in this application.

[0013] Figure 3 It is the illustration of the up and down movement of the driving rod of the permanent magnet mechanism.

[0014] Figure 4 It is the illustration of the shock-proof member provided for the permanent magnet mechanism in this application.

[0015] Figure 5 For this application Figure 4 The enlarged illustration of the structure at A.

[0016] Figure 6 It is the side view structure diagram of the buffer groove in this application.

[0017] Figure 7 It is the illustration of the assembly plate being in contact and stuck with the inner wall of the buffer groove after being impacted in this application.

[0018] Figure 8 It is the illustration of setting the corners of the assembly plate as arc-shaped surfaces in this application. Detailed Embodiment

[0019] In order to enable ordinary technicians in the field to better understand the technical solution of this application, the technical solution of this application will be further described below with reference to the drawings and embodiments.

[0020] Refer to the attached Figures 1-8A permanent magnet mechanism adapted to a 50kA circuit breaker is shown. The permanent magnet mechanism 3 is assembled to the symmetrical bent plates 2 inside the circuit breaker 1, and a driving rod 31 that moves axially along the permanent magnet mechanism 3 is provided inside the permanent magnet mechanism 3. When the permanent magnet mechanism 3 operates, its driving rod 31 moves downward, driving the rod inside the circuit breaker connected to the driving rod 31 to operate, achieving the on-off function.

[0021] In order to enable the permanent magnet mechanism 3 to match the short-circuit breaking current of 50kA without increasing the width of the circuit breaker, in this application, the outer diameter of the permanent magnet mechanism 3 is increased in line with the increase in the breaking current of the circuit breaker 1, so as to meet the driving strength of the 50kA short-circuit breaking current. At the same time, preferably, according to the driving force of the 50kA short-circuit breaking current, the internal coil (number of turns and wire diameter) and the iron core specifications of the permanent magnet mechanism 3 are calculated and optimized accordingly (the increase in the outer diameter of the permanent magnet mechanism 3 causes the internal magnet sheets to increase in size and quantity, and the magnetic force increases accordingly) to provide sufficient magnetic force to drive the driving rod 31.

[0022] When the driving strength of the 50kA short-circuit breaking current is satisfied, the short-circuit impact received by the permanent magnet mechanism 3 during the on-off process increases accordingly. Therefore, in order to mitigate the short-circuit impact of the permanent magnet mechanism 3, as Figure 4 shown, an impact-proof member is provided at the connection position between the permanent magnet mechanism 3 and the bent plate 2. The impact-proof member effectively buffers the increased impact during short-circuit, thereby realizing the protection effect during the operation of the permanent magnet mechanism 3.

[0023] Specifically, as Figure 2 shown, the outer diameter of the permanent magnet mechanism 3 is increased by 12mm. When the original permanent magnet mechanism 3 was assembled between the symmetrical bent plates 2, there was an assembly gap. Therefore, this increased 12mm can assemble the improved permanent magnet mechanism 3 between the symmetrical bent plates 2 without increasing the width of the circuit breaker and the distance between the bent plates 2, thereby achieving the condition of meeting the 50kA short-circuit breaking current without increasing the width of the circuit breaker and the switchgear cabinet.

[0024] In order to effectively buffer the increased impact force of the on-off current, as Figures 4-5 shown, an assembly plate 4 for fixedly assembling the permanent magnet mechanism 3 is provided on the symmetrical bent plates 2. The bottom end of the permanent magnet mechanism 3 is preferably connected to the assembly plate 4 through a plurality of connecting screws (not shown in the figure). The impact-proof member includes buffer grooves 5 that are movably embedded in the side edges of the assembly plate 4 on the inner walls of each side of the bent plate 2. The buffer groove 5 is Figure 6 shown as a rectangular frame structure, with a left-right width equivalent to that of the assembly plate 4, which limits the horizontal direction of the permanent magnet mechanism 3; and the up-down height is greater than the thickness of the assembly plate 4. After the permanent magnet mechanism 3 receives the up-down impact of the driving rod 31, the assembly plate 4 moves up and down in the buffer groove 5 to achieve the buffering of the impact effect.

[0025] On the upper and lower sides inside each buffer slot 5, buffer pads 6 that are in contact with the assembly plate 4 are provided. The buffer pads 6 are preferably made of rubber, which can effectively buffer the impact received by the assembly plate 4 from the permanent magnet mechanism 3, thereby avoiding the problem of damage to the permanent magnet mechanism 3 due to a large impact and extending the service life of the permanent magnet mechanism 3.

[0026] As Figure 5 shown, to ensure the accuracy of the vertical driving of the driving rod 31, the inner width of the buffer slot 5 is slightly larger than the width of the assembly plate 4 to achieve the horizontal limit of the assembly plate 4 and the permanent magnet mechanism 3 and avoid the skew during the vertical movement of the driving rod 31. When subjected to a short-circuit impact, the assembly plate 4 moves up and down in the buffer slot 5. Under the action of a large impact force, the assembly plate 4 will sway left and right in the buffer slot 5, and then the corners of the assembly plate 4 shown in the oval circle in Figure 7 will contact the inner wall surface of the buffer slot 5, which will cause the problem of contact jamming of the assembly plate 4 and affect the buffering effect of the assembly plate 4 and the permanent magnet mechanism 3. Therefore, to solve this problem, as Figure 8 shown, arc surfaces 4a are provided on the upper and lower sides of the side wall of the assembly plate 4. While ensuring that the width of the assembly plate 4 remains unchanged and achieving the horizontal limit of the driving rod 31, the corners of the assembly plate 4 that are easily in contact with the buffer slot 5 are away from the inner wall of the buffer slot 5, so that after being impacted and swaying, the corners of the assembly plate 4 are not easily in contact with the inner wall of the buffer slot 5, thereby solving the drawback of easy jamming under the impact and ensuring an effective buffering effect.

[0027] The principle of this application is: increase the outer diameter of the permanent magnet mechanism 3 by a size of 12 mm, and the permanent magnet mechanism 3 still can be assembled into the original circuit breaker after being optimized and designed to meet the short-circuit breaking current of 50 kA, so as to achieve the purpose of not increasing the width of the circuit breaker and the width of the switchgear while meeting the short-circuit breaking current of 50 kA.

[0028] By providing shock-proof components, after the permanent magnet mechanism 3 is impacted up and down by the driving rod 31, the assembly plate 4 moves up and down in the buffer slot 5, and the buffer pads 6 are used to buffer the impact. Further, after arc surfaces 4a are provided on the upper and lower sides of the side wall of the assembly plate 4, while ensuring that the width of the assembly plate 4 remains unchanged and achieving the horizontal limit of the driving rod 31, the corners of the assembly plate 4 that are easily in contact with the buffer slot 5 are away from the inner wall of the buffer slot 5, so that after being impacted and swaying, the corners of the assembly plate 4 are not easily in contact with the inner wall of the buffer slot 5, thereby solving the drawback of easy jamming under the impact and ensuring an effective buffering effect.

[0029] The above shows and describes the basic principle, main features and advantages of this application. Without departing from the spirit and scope of this application, this application will have various changes and improvements, and these changes and improvements all fall within the scope of this application claimed.

Claims

1. A permanent magnet mechanism adapted for a 50 kA circuit breaker. The permanent magnet mechanism (3) is assembled on symmetric bent plates (2) inside the circuit breaker (1). The permanent magnet mechanism (3) has a drive rod (31) that moves axially therein. It is characterized in that: The outer diameter of the permanent magnet mechanism (3) is increased to conform to the increase in the breaking current of the circuit breaker (1), and an anti-impact member is provided at the connection position between the permanent magnet mechanism (3) and the bent plate (2).

2. The permanent magnet mechanism according to claim 1, characterized in that: The increased size of the outer diameter of the permanent magnet mechanism (3) is 12 mm.

3. The permanent magnet mechanism according to claim 2, characterized in that: An assembly plate (4) for fixedly assembling the permanent magnet mechanism (3) is provided on the symmetric bent plates (2). The anti-impact member includes buffer grooves (5) movably embedded in the side edges of the assembly plate (4) on the inner walls of each bent plate (2), and buffer pads (6) are arranged on the upper and lower sides of each buffer groove (5) and are in contact with the assembly plate (4).

4. The permanent magnet mechanism according to claim 3, wherein: Arc-shaped surfaces (4a) are provided on the upper and lower sides of the side wall of the assembly plate (4).

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