Circuit breaker switch

Abstract

The utility model discloses a circuit breaker switch, which comprises a plurality of groups of isolating switch assemblies and circuit breaker assemblies, the knife tails of moving contact rods of the isolating switch assemblies are rotatably connected to a lower static contact seat, the lower static contact seat is connected to the circuit breaker assemblies, and an upper static contact seat is connected to a support beam. The movable feeler lever rotates around a connecting point of the knife tail and the lower static contact seat, so that the knife head and the upper static contact seat are contacted for closing or separated for opening; the moving feeler lever of each disconnecting switch assembly is inserted into the insertion hole of the main shaft, and the driving end of the main shaft is inserted with a transmission rod. The metal transmission rod is inserted into the driving end of the main shaft, so that the strength of the driving end is improved, and the transmission stability and reliability are improved. The connection point of the knife tail of the movable contact rod and the lower static contact seat is located outside the insertion hole of the main shaft, so that the adaptive relation between the lower static contact seat and the main shaft is avoided, and the requirements of design, processing and assembly are reduced.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to a circuit breaker switch. Background Technology

[0002] Circuit breakers have three operating positions: closed, open, and grounded. They can be switched between these three positions to ensure safe and stable operation of electrical work.

[0003] Chinese invention patent application CN117936317A discloses a disconnecting switch that facilitates opening and closing. An insulating spindle is rotatably connected between the front and rear mounting plates of the disconnecting switch. Multiple contact blades are fixedly mounted on the upper end of the insulating spindle, and a groove adapted to the lower stationary contact seat is formed on the lower end of the insulating spindle. The design of this disconnecting switch requires consideration of both the fit between the insulating spindle and the contact blades, as well as the fit with the stationary contact seat, placing high demands on design, processing, and assembly. The insulating spindle is made of plastic, and the connection point with the drive shaft is relatively weak, affecting transmission stability and reliability. Utility Model Content

[0004] To address the shortcomings of existing switches, the applicant provides a circuit breaker switch with a reasonable structure. The main shaft of the isolating switch assembly only needs to consider its cooperation with the moving contact rod, reducing the requirements for design, processing, and assembly. A metal transmission rod is added to the connection between the main shaft and the drive shaft to improve strength, transmission stability, and reliability.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A circuit breaker switch includes several sets of disconnector switch assemblies and circuit breaker assemblies. The blade end of the moving contact rod of the disconnector switch assembly is rotatably connected to the lower stationary contact seat, which is connected to the circuit breaker assembly. The upper stationary contact seat is connected to a support beam. During operation, the moving contact rod rotates around the connection point between the blade end and the lower stationary contact seat, causing the blade head to contact the upper stationary contact seat for closing or disengaging from opening. The moving contact rods of each set of disconnector switch assemblies are inserted into the through holes of the main shaft, and a transmission rod is inserted into the drive end of the main shaft.

[0007] As a further improvement to the above technical solution:

[0008] The transmission rod is made of metal. The cutting head and the cutting tail of the moving contact rod pass through the insertion hole respectively. The connection point between the cutting tail and the lower stationary contact seat is located outside the insertion hole of the main shaft. The two ends of the main shaft are rotatably connected to the partition plate respectively. The connection point between the main shaft and the partition plate is located at the lower part of the main shaft.

[0009] Each circuit breaker assembly is mounted on an insulating barrel, with both ends of the insulating barrel fixedly connected to a partition plate. A hexagonal shaft runs horizontally through the lower part of each circuit breaker assembly, and umbrella skirts are fitted on the hexagonal shaft between two circuit breaker assemblies.

[0010] The cutting head of the moving contact rod is covered with a first pressure equalization cover, and the first pressure equalization cover is provided with a rim, which is wrapped around the outside of the cutting head; the rim includes a side rim and a top rim, the side rim is wrapped around the outside of the side edge of the cutting head, and the top rim is wrapped around the outside of the top edge of the cutting head.

[0011] The cutting head of the moving contact rod is connected to the first equalizing cover by the first pair of locking screws. A first compression spring is provided between the head of the first pair of locking screws and the first equalizing cover. The first compression spring presses the first equalizing cover tightly onto the cutting head. A second countersunk hole is provided on the second mounting hole on the first equalizing cover for the first pair of locking screws to pass through. A second stepped surface is formed at the bottom of the second countersunk hole. The head of the first pair of locking screws and the first compression spring are recessed into the second countersunk hole, and the first compression spring is pressed tightly against the first stepped surface.

[0012] The moving contact rod has a spherical protrusion at its tip, and a corresponding spherical recess is provided on the lower stationary contact seat. The protrusion and the recess are engaged by the spherical surface.

[0013] There are two moving contact rods arranged facing each other. The blades of the two moving contact rods, together with the first equalizing cover, are connected by a first pair of locking screws. A limiting sleeve is fitted on the first pair of locking screws, and the limiting sleeve is located between the blades of the two moving contact rods. The blade tails of the moving contact rods are connected to the lower stationary contact seat by a second pair of locking screws. A second compression spring is provided between the head of the second pair of locking screws and the blade tail, and the second compression spring presses the blade tail tightly onto the lower stationary contact seat. A second equalizing cover is provided on the head of the second pair of locking screws, and the blade tails of the two moving contact rods are respectively connected to opposite sides of the lower stationary contact seat.

[0014] The upper stationary contact seat includes a contact and a connecting part. The connecting part is inserted into the insertion hole of the support beam. The pressure equalizing plate presses the upper stationary contact seat onto the support beam. The contact passes through the through hole of the pressure equalizing plate. The pressure equalizing plate is fixed to the support beam. An axial positioning structure and a circumferential positioning structure are provided between the upper stationary contact seat and the support beam.

[0015] The support beam has a first countersunk hole in its insertion hole, forming a first stepped surface inside the insertion hole; the connecting part of the upper stationary contact seat has a first column and a second column, the bottom of the first column has an axial positioning surface, the axial positioning surface cooperates with the first stepped surface of the insertion hole to form an axial positioning structure, or the bottom surface of the contact cooperates with the first stepped surface of the insertion hole to form an axial positioning structure; the inner wall of the insertion hole of the support beam has a first flat square plane, and the connecting part of the upper stationary contact seat has a corresponding second flat square plane, the second flat square plane cooperates with the first flat square plane to form a circumferential positioning structure.

[0016] The pressure equalizing plate has a press-fitting hole, and a fourth stepped surface is formed between the press-fitting hole and the through hole. The press-fitting hole corresponds to the upper part of the first column of the upper stationary contact seat, and the fourth stepped surface is pressed against the top surface of the first column. The press-fitting hole of the pressure equalizing plate is provided with a fourth flat square plane, which cooperates with the second flat square plane to form a circumferential positioning structure; or a third flat square plane is provided on the first column of the upper stationary contact seat, and the fourth flat square plane cooperates with the third flat square plane to form a circumferential positioning structure. The pressure equalizing plate is fixedly connected to the first mounting hole of the support beam by fasteners, and the nut connected to the fastener is placed in the first mounting hole. The pressure equalizing plate has a third mounting hole, and a third countersunk hole is provided at the upper part of the third mounting hole. The fastener passes through the third mounting hole, and the head of the fastener is recessed into the third countersunk hole.

[0017] The beneficial effects of the utility model are as follows:

[0018] The drive end of the spindle in this invention is fitted with a metal transmission rod, which improves the strength of the drive end and enhances the stability and reliability of the transmission. The connection point between the cutting edge of the moving contact rod and the lower stationary contact seat is located outside the through hole of the spindle, eliminating the need for a mating relationship between the lower stationary contact seat and the spindle, and reducing the requirements for design, processing, and assembly.

[0019] In addition to being attached to the side of the cutter head, the first equalizing cover of this utility model also wraps around the side and top edges of the cutter head, resulting in better optimization of the electric field distribution and a higher withstand voltage level. The wrapping of the first equalizing cover not only serves to wrap the cutter head but also to prevent rotation and provide positioning. During installation, the wrapping of the first equalizing cover is fastened to the outer and top edges of the cutter head to achieve positioning, and then tightened with the first pair of locking screws to complete the assembly. This not only saves the need for an anti-rotation structure and reduces the design and processing difficulty of the cutter head and the first equalizing cover, but also reduces the requirements for assembly accuracy and simplifies the assembly process.

[0020] The contact seat of this invention is directly inserted into the support beam by insertion and then pressed and fixed by a pressure equalizing plate. On the one hand, this eliminates the problem of increased resistance caused by the transfer between components and reduces the loss during current transmission. On the other hand, it simplifies the assembly process. The upper stationary contact seat is fixed by pressing with a pressure equalizing plate, and the adjustment of the upper stationary contact seat only requires adjustment of the corresponding pressure equalizing plate, saving time and cost. Moreover, the upper stationary contact seat is fixed by pressing with a pressure equalizing plate, which increases the break distance and improves the break withstand voltage. Attached Figure Description

[0021] Figure 1 It is a structural diagram of the present utility model.

[0022] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0023] Figure 3 for Figure 1 Enlarged view of point B in the middle.

[0024] Figure 4 This is a structural schematic diagram of the supporting beam.

[0025] Figure 5 This is a schematic diagram of the first equalizing shield.

[0026] Figure 6 This is a schematic diagram of the upper stationary contact seat.

[0027] Figure 7 This is a schematic diagram of the pressure equalization plate.

[0028] In the picture:

[0029] 100. Support assembly; 1. Partition plate; 2. Support beam; 21. Insertion hole; 211. First countersunk hole; 212. First stepped surface; 213. First flat rectangular plane; 22. First mounting hole;

[0030] 200. Disconnector assembly; 3. Main shaft; 31. Through hole; 32. Transmission rod; 4. Moving contact rod; 41. Cutting head; 42. Cutting tail; 421. Protrusion; 5. First equalizing cover; 51. Second mounting hole; 511. Second countersunk hole; 512. Second stepped surface; 52. Side edge; 53. Top edge; 6. First pair of locking screws; 7. Limiting sleeve; 8. Lower stationary contact seat; 81. Recessed hole; 9. Second pair of locking screws; 10. Second equalizing cover; 11. First compression spring 12. Second compression spring; 13. Upper stationary contact seat; 131. Contact; 132. Connecting part; 1321. First column; 1322. Second column; 1323. Second flat square plane; 1324. Third flat square plane; 1325. Third stepped surface; 14. Equalizing plate; 141. Through hole; 142. Press-fit hole; 1421. Fourth flat square plane; 143. Fourth stepped surface; 144. Third mounting hole; 1441. Third countersunk hole; 15. Fastener;

[0031] 300. Circuit breaker assembly; 17. Insulating barrel; 18. Hexagonal shaft; 19. Umbrella skirt. Detailed Implementation

[0032] The specific implementation of the present utility model will be described below with reference to the accompanying drawings.

[0033] The circuit breaker switch of this utility model includes a disconnector switch assembly 200 and a circuit breaker assembly 300. The disconnector switch assembly 200 and the circuit breaker assembly 300 can adopt an upper disconnector and lower circuit breaker (upper disconnector switch) structure or a lower disconnector and upper circuit breaker (lower disconnector switch) structure. In this embodiment, the upper disconnector switch structure is used as an example for explanation.

[0034] like Figure 1As shown, this utility model arranges several sets of corresponding disconnector assemblies 200 and circuit breaker assemblies 300 side by side on the support assembly 100. The support assembly 100 includes two vertically spaced partitions 1 and a support beam 2 connected to the upper part of the two partitions 1.

[0035] like Figures 1 to 3 As shown, each disconnector assembly 200 includes two face-to-face moving contact rods 4, a lower stationary contact seat 8, and an upper stationary contact seat 13. The upper stationary contact seat 13 is connected to the support beam 2. The blade tail 42 of each moving contact rod 4 is rotatably connected to the lower stationary contact seat 8. The lower stationary contact seat 8 is connected to the top of the circuit breaker assembly 300. The moving contact rod 4 can rotate around the connection point between the blade tail 42 and the lower stationary contact seat 8, so that the blade head 41 contacts the upper stationary contact seat 13 to close or disengage from the circuit breaker. The moving contact rods 4 of each disconnector assembly 200 are inserted into the insertion holes 31 of the same main shaft 3. The blade head 41 and blade tail 42 of the moving contact rod 4 protrude from the insertion holes 31 respectively. The connection point between the blade tail 42 and the lower stationary contact seat 8 is located outside the insertion holes 31 of the main shaft 3, eliminating the need for a matching relationship between the lower stationary contact seat 8 and the main shaft 3, and reducing the requirements for design, processing and assembly. Both ends of the main shaft 3 are rotatably connected to the partition plate 1. The connection point between the main shaft 3 and the partition plate 1 is located at the lower part of the main shaft 3. One end of the main shaft 3 is connected to the drive shaft as the drive end and is driven to rotate by the drive shaft. A transmission rod 32 is inserted into the drive end of the main shaft 3 by a tight connection. The transmission rod 32 is made of metal, which improves the strength of the drive end and improves the stability and reliability of the transmission.

[0036] like Figure 2 As shown, each moving contact rod 4 has a first pressure equalization cover 5 on the side facing away from the opposite moving contact rod 4. The two moving contact rods 4 have their cutting heads 41 together with the first pressure equalization cover 5 connected by a first pair of locking screws 6. A limiting sleeve 7 is fitted on the first pair of locking screws 6, and the limiting sleeve 7 is located between the two moving contact rods 4 have their cutting heads 41, limiting the movement of the two cutting heads 41. A first compression spring 11 is provided between the head of the first pair of locking screws 6 and the first pressure equalization cover 5, and the first compression spring 11 presses the first pressure equalization cover 5 tightly onto the cutting head 41. Figure 2 , Figure 4 As shown, a second mounting hole 51 is formed on the first equalizing cover 5 corresponding to the first pair of locking screws 6. A second countersunk hole 511 is formed on the side of the second mounting hole 51 away from the cutter head 41. A second stepped surface 512 is formed at the bottom of the second countersunk hole 511. The heads of the first pair of locking screws 6 and the first compression spring 11 are recessed into the second countersunk hole 511. The first compression spring 11 is pressed against the second stepped surface 512, thereby pressing the first equalizing cover 5 tightly. Figure 2 , Figure 5As shown, the first equalizing cover 5 has side edging 52 on both sides and a top edging 53 on the top side, with the side edging 52 and top edging 53 integrated. The side edging 52 and top edging 53 extend towards the cutter head 41, with the side edging 52 covering the outer side edge of the cutter head 41 and the top edging 53 covering the outer top edge of the cutter head 41. In addition to fitting against the side of the cutter head 41, the first equalizing cover 5 also wraps around the side and top edges of the cutter head 41 through edging, resulting in better optimization of the electric field distribution and a higher withstand voltage level. The edging of the first equalizing cover 5 not only serves to wrap but also has the functions of anti-rotation and positioning. During installation, the edging of the first equalizing cover 5 is fastened to the outer and top edges of the cutter head 41 to achieve positioning, and then tightened by the first pair of locking screws 6 to complete the assembly. This not only saves the need for an anti-rotation structure and reduces the design and processing difficulty of the cutter head 41 and the first equalizing cover 5, but also reduces the requirements for assembly accuracy and simplifies the assembly process.

[0037] like Figure 3 As shown, the blade ends 42 of the two moving contact rods 4 are respectively connected to opposite sides of the lower stationary contact seat 8. The blade ends 42 of the two moving contact rods 4 are connected to the lower stationary contact seat 8 through a second pair of locking screws 9. A second compression spring 12 is provided between the head of the second pair of locking screws 9 and the blade ends 42, and the second compression spring 12 presses the blade ends 42 tightly onto the lower stationary contact seat 8. A second equalizing cover 10 is provided on the head of the second pair of locking screws 9. The second equalizing cover 10 can evenly distribute the high electric field strength generated at the end of the second pair of locking screws 9, optimize the electric field distribution, and improve the withstand voltage level. Each blade end 42 of the moving contact rod 4 has a spherical protrusion 421 at the part that contacts the lower stationary contact seat 8. A corresponding spherical concave hole 81 is provided on the lower stationary contact seat 8. The protrusion 421 and the concave hole 81 are fitted together by the spherical surface, resulting in a larger mating area and more reliable current transmission.

[0038] like Figure 2 As shown, the upper stationary contact 13 is inserted into the support beam 2, and the equalizing plate 14 presses the upper stationary contact 13 tightly onto the support beam 2. The equalizing plate 14 is fixedly connected to the support beam 2 by fasteners 15. The upper stationary contact 13 is directly inserted into the support beam 2 by insertion and fixed by the equalizing plate 14. On the one hand, this eliminates the problem of increased resistance caused by the transfer between components, reducing losses during current transmission. On the other hand, it simplifies the assembly process. The upper stationary contact 13 is fixed by the equalizing plate 14, and adjustments to the upper stationary contact 13 only require adjustments to the corresponding equalizing plate 14, saving time and cost. Moreover, the upper stationary contact 13 is fixed by the equalizing plate 14, increasing the break distance and improving the break withstand voltage. Figure 4As shown, the support beam 2 has an insertion hole 21 corresponding to the upper stationary contact seat 13 and a first mounting hole 22 corresponding to the fastener 15. The upper stationary contact seat 13 is inserted into the insertion hole 21, and the fastener 15 is connected to the first mounting hole 22. The nut connected to the fastener 15 is placed in the first mounting hole 22 to ensure reliable connection. A first countersunk hole 211 is formed in the insertion hole 21, and a first stepped surface 212 is formed inside the insertion hole 21. A first flat rectangular plane 213 is provided on the inner wall surfaces on opposite sides of the insertion hole 21.

[0039] like Figure 6 As shown, the upper stationary contact 13 is an integral structure, including an upper contact 131 and a lower connecting portion 132. The contact 131 has a flat plate structure, and the connecting portion 132 has a cylindrical structure. The thickness of the contact 131 is smaller than the cylindrical outer diameter of the connecting portion 132. The connecting portion 132 includes an upper first column portion 1321 and a lower second column portion 1322. The outer diameter of the first column portion 1321 is larger than the outer diameter of the second column portion 1322. The bottom surface of the first column portion 1321 forms an axial positioning surface and abuts against the first stepped surface 212 of the insertion hole 21 to axially position the upper stationary contact 13. In other embodiments, the outer diameters of the first column portion 1321 and the second column portion 1322 can also be the same. In this case, the bottom surface of the contact 131 is used as the axial positioning surface, and the bottom surface of the contact 131 abuts against the first stepped surface 212 of the insertion hole 21 to axially position the upper stationary contact 13. The first column 1321 has a second flat rectangular plane 1323 on both opposite sides; such as Figure 3 As shown, the second flat plane 1323 is adapted to the first flat plane 213 of the support beam 2. The second flat plane 1323 and the first flat plane 213 cooperate to form a circumferential positioning structure, which positions the installation position of the upper stationary contact seat 13 and ensures that the installation angle of the contact 131 meets the requirements. A notch is opened on the upper part of the first column 1321 on the same side of the column as the second flat plane 1323, forming a third flat plane 1324 and a third stepped surface 1325 above the second flat plane 1323. In other embodiments, the first column 1321 may not have a notch, and the second flat plane 1323 may be opened along the entire axial length of the side of the first column 1321, that is, only the second flat plane 1323 is opened on the opposite sides of the first column 1321 (without the third flat plane 1324 and the third stepped surface 1325).

[0040] like Figure 2 , Figure 7As shown, the equalizing plate 14 has a through hole 141 and a press-fit hole 142 corresponding to the upper stationary contact seat 13. A fourth stepped surface 143 is formed between the press-fit hole 142 and the through hole 141. The through hole 141 is a flat elongated hole that corresponds to and mates with the contact 131, which protrudes through the through hole 141. The press-fit hole 142 mates with the upper part of the first column portion 1321 of the connecting portion 132. The fourth stepped surface 143 is pressed against the top surface of the first column portion 1321. The bottom surface of the equalizing plate 14 is adapted to the third stepped surface 1325. A fourth flat rectangular plane 1421 is provided on the inner wall surfaces of the press-fit hole 142 on both sides, as shown in the figure. Figure 3 As shown, the fourth flat plane 1421 is adapted to the third flat plane 1324, and the cooperation of the fourth flat plane 1421 and the third flat plane 1324 also forms a circumferential positioning structure, providing double positioning for the upper stationary contact 13, improving the installation accuracy of the upper stationary contact 13, and ensuring that the upper stationary contact 13 is installed in place. In other embodiments, when the first column portion 1321 only has a second flat plane 1323, the fourth flat plane 1421 is adapted to the second flat plane 1323, and the cooperation of the fourth flat plane 1421 and the second flat plane 1323 forms a circumferential positioning structure. The equalizing plate 14 has a third mounting hole 144 corresponding to the fastener 15, and a third countersunk hole 1441 is formed at the upper part of the third mounting hole 144. The fastener 15 passes through the third mounting hole 144, and the head of the fastener 15 is completely sunk into the third countersunk hole 1441, avoiding tip discharge of the fastener 15 and improving the product's withstand voltage.

[0041] like Figure 1 As shown, each group of circuit breaker assemblies 300 is mounted on the same insulating barrel 17, with both ends of the insulating barrel 17 fixedly connected to the partition plate 1. A hexagonal shaft 18 runs horizontally through the lower part of each group of circuit breaker assemblies 300. The hexagonal shaft 18 is a drive shaft that can drive the cam assembly of the circuit breaker assembly 300 to rotate, thereby causing the vacuum moving contact to move up and down, achieving contact or separation with the vacuum stationary contact. Umbrella skirts 19 are respectively fitted on the hexagonal shaft 18 and between two circuit breaker assemblies 300. The umbrella skirts 19 can improve the phase-to-phase withstand voltage, and the edge umbrella skirts 19 can also improve the withstand voltage value with the gas box and dynamic seal.

[0042] The above description is an explanation of the present utility model and not a limitation thereof. The present utility model can be modified in any form without departing from its spirit.

Claims

1. A circuit breaker switch, comprising a plurality of disconnector switch assemblies (200) and circuit breaker assemblies (300), characterized in that: The blade end (42) of the moving contact rod (4) of the disconnector assembly (200) is rotatably connected to the lower stationary contact seat (8). The lower stationary contact seat (8) is connected to the circuit breaker assembly (300), and the upper stationary contact seat (13) is connected to the support beam (2). During operation, the moving contact rod (4) rotates around the connection point between the blade end (42) and the lower stationary contact seat (8), so that the blade head (41) contacts the upper stationary contact seat (13) to close or disengage from the circuit breaker. The moving contact rod (4) of each disconnector assembly (200) is inserted into the through hole (31) of the main shaft (3), and the drive end of the main shaft (3) is fitted with a transmission rod (32).

2. The circuit breaker switch according to claim 1, characterized in that: The transmission rod (32) is made of metal. The cutting head (41) and the cutting tail (42) of the moving contact rod (4) pass through the through hole (31) respectively. The connection point between the cutting tail (42) and the lower stationary contact seat (8) is located outside the through hole (31) of the main shaft (3). The two ends of the main shaft (3) are rotatably connected to the partition (1), and the connection point between the main shaft (3) and the partition (1) is located at the lower part of the main shaft (3).

3. The circuit breaker switch according to claim 1, characterized in that: Each circuit breaker assembly (300) is mounted on an insulating barrel (17), and both ends of the insulating barrel (17) are fixedly connected to the partition plate (1); a hexagonal shaft (18) runs horizontally through the lower part of each circuit breaker assembly (300), and umbrella skirts (19) are respectively fitted on the hexagonal shaft (18) between two circuit breaker assemblies (300).

4. The circuit breaker switch according to claim 1, characterized in that: The cutting head (41) of the moving contact rod (4) is covered with a first pressure equalization cover (5), and the first pressure equalization cover (5) is provided with a edging, which is wrapped around the outside of the cutting head (41); the edging includes a side edging (52) and a top edging (53), the side edging (52) is wrapped around the outside of the side edge of the cutting head (41), and the top edging (53) is wrapped around the outside of the top edge of the cutting head (41).

5. The circuit breaker switch according to claim 1, characterized in that: The cutting head (41) of the moving contact rod (4) is connected to the first pressure equalizing cover (5) by the first pair of locking screws (6). A first compression spring (11) is provided between the head of the first pair of locking screws (6) and the first pressure equalizing cover (5). The first compression spring (11) presses the first pressure equalizing cover (5) onto the cutting head (41). A second countersunk hole (511) is provided on the second mounting hole (51) on the first pressure equalizing cover (5) for the first pair of locking screws (6) to pass through. A second step surface (512) is formed at the bottom of the second countersunk hole (511). The head of the first pair of locking screws (6) and the first compression spring (11) are sunk into the second countersunk hole (511). The first compression spring (11) is pressed against the first step surface (212).

6. The circuit breaker switch according to claim 1, characterized in that: The blade end (42) of the moving contact rod (4) is provided with a spherical protrusion (421), and a corresponding spherical concave hole (81) is provided on the lower stationary contact seat (8). The protrusion (421) and the concave hole (81) are engaged by the spherical surface.

7. The circuit breaker switch according to claim 1, characterized in that: There are two moving contact rods (4), which are arranged face to face. The blades (41) of the two moving contact rods (4) are connected together with the first equalizing cover (5) by the first pair of locking screws (6). The first pair of locking screws (6) is fitted with a limiting sleeve (7), which is located between the blades (41) of the two moving contact rods (4). The tail (42) of the moving contact rod (4) is connected to the lower stationary contact seat (8) by the second pair of locking screws (9). A second compression spring (12) is provided between the head of the second pair of locking screws (9) and the tail (42). The second compression spring (12) presses the tail (42) onto the lower stationary contact seat (8). The head of the second pair of locking screws (9) is provided with a second equalizing cover (10). The tails (42) of the two moving contact rods (4) are respectively connected to the opposite sides of the lower stationary contact seat (8).

8. The circuit breaker switch according to claim 1, characterized in that: The upper stationary contact seat (13) includes a contact (131) and a connecting part (132). The connecting part (132) is inserted into the insertion hole (21) of the support beam (2). The pressure equalizing plate (14) presses the upper stationary contact seat (13) onto the support beam (2). The contact (131) passes through the through hole (141) of the pressure equalizing plate (14). The pressure equalizing plate (14) is fixed to the support beam (2). An axial positioning structure and a circumferential positioning structure are provided between the upper stationary contact seat (13) and the support beam (2).

9. The circuit breaker switch according to claim 8, characterized in that: The insertion hole (21) of the support beam (2) is provided with a first countersunk hole (211), and a first stepped surface (212) is formed in the insertion hole (21); the connecting part (132) of the upper stationary contact seat (13) is provided with a first column (1321) and a second column (1322), and the bottom of the first column (1321) is provided with an axial positioning surface. The axial positioning surface and the first stepped surface (212) of the insertion hole (21) cooperate to form an axial positioning structure, or the bottom surface of the contact (131) cooperates with the first stepped surface (212) of the insertion hole (21) to form an axial positioning structure; the inner wall surface of the insertion hole (21) of the support beam (2) is provided with a first flat square plane (213), and the connecting part (132) of the upper stationary contact seat (13) is provided with a corresponding second flat square plane (1323). The second flat square plane (1323) and the first flat square plane (213) cooperate to form a circumferential positioning structure.

10. The circuit breaker switch according to claim 8, characterized in that: A pressure equalizing plate (14) is provided with a press-fitting hole (142), and a fourth step surface (143) is formed between the press-fitting hole (142) and the through hole (141). The press-fitting hole (142) is correspondingly engaged with the upper part of the first column (1321) of the upper stationary contact seat (13), and the fourth step surface (143) is pressed against the top surface of the first column (1321). The press-fitting hole (142) of the pressure equalizing plate (14) is provided with a fourth flat square plane (1421), and the fourth flat square plane (1421) and the second flat square plane (1323) are engaged to form a circumferential positioning structure; or a pressure equalizing plate (1421) is provided with a press-fitting hole (1421) of the upper stationary contact seat (13). A third flat plane (1324) and a fourth flat plane (1421) are provided to cooperate with the third flat plane (1324) to form a circumferential positioning structure; the pressure equalizing plate (14) is fixedly connected to the first mounting hole (22) of the support beam (2) by fasteners (15), and the nut connected to the fasteners (15) is placed in the first mounting hole (22); a third mounting hole (144) is provided on the pressure equalizing plate (14), and a third countersunk hole (1441) is provided on the upper part of the third mounting hole (144). The fasteners (15) pass through the third mounting hole (144), and the head of the fasteners (15) is sunk into the third countersunk hole (1441).

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