Circuit breaker three-position switch

Abstract

The application relates to the technical field of circuit breakers, in particular to a three-position switch of a circuit breaker, which comprises an insulating frame and a circuit breaker main body arranged on the insulating frame, the circuit breaker main body comprises a circuit breaker main shaft, a cam part and a vacuum tube, the circuit breaker main shaft drives the cam part to rotate, one end of the vacuum tube is provided with a connecting column, the connecting column is matched with the cam part through a cross pin, a cam support is further arranged on the insulating frame through a fastener, the cam support covers the outside of the cam part, a pressure equalizing cavity for the rotation of the cam part is arranged in the cam support, the circuit breaker main shaft penetrates through the cam support, and a sliding groove for the extension of the cross pin is recessed in the inner wall of the cam support, the cam part of the application is wrapped in the cam support, the electric field is uniformly distributed, the insulation capacity is stronger, and the sliding groove of the cam support is used for guiding the moving path of the connecting column, so that the stable work of the circuit breaker is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit breaker, in particular to a three-position switch of circuit breaker. BACKGROUND

[0002] The environmental protection cabinet is an electrical equipment adopting high-voltage switch equipment to form a spaced ring network power supply unit, which is mainly applied in the power distribution station or box-type substation of public buildings, industrial and mining enterprises and residential areas. The environmental protection cabinet supplies power to the main line through high-voltage switches, which is an important switch equipment for ring network power supply and terminal power supply, and its short-circuit breaking capacity reaches the level of switch cabinet.

[0003] The existing environmental protection cabinet circuit breaker usually drives the circuit breaker moving up and down linearly through the cam to realize the opening and closing of the circuit breaker, but the cam adopts an open installation structure, which is exposed to the outside, has poor insulation capacity and uneven electric field distribution. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings and deficiencies of the prior art, and to provide a three-position switch of circuit breaker. The cam part of the present application is wrapped inside the cam bracket, so that the electric field is evenly distributed and the insulation capacity is stronger. The sliding groove of the cam bracket is used to guide the movement path of the connecting column to ensure the stable operation of the circuit breaker.

[0005] The technical scheme adopted by the present application is as follows: a three-position switch of circuit breaker, comprising an insulating frame and a circuit breaker body arranged on the insulating frame, wherein the circuit breaker body comprises a circuit breaker main shaft, a cam part and a vacuum tube, the circuit breaker main shaft drives the cam part to rotate, one end of the vacuum tube is provided with a connecting column, the connecting column is matched with the cam part through a cross pin, a cam bracket is also installed on the insulating frame through a fastener, the cam bracket covers the outside of the cam part, and a pressure equalizing cavity for the rotation of the cam part is arranged inside the cam bracket, the circuit breaker main shaft penetrates through the cam bracket, and a sliding groove for the cross pin to extend into is recessed on the inner wall of the cam bracket.

[0006] A side cover is detachably connected to the cam part, both sides of the side cover are provided with plug-in blocks, the cam part is provided with plug-in grooves matched with the plug-in blocks, the side cover and the cam part are connected to form a shaft sleeve matched with the circuit breaker main shaft, both ends of the shaft sleeve are provided with protrusions, the cam part is also connected with the circuit breaker main shaft through a detachable assembly, the detachable assembly comprises two end covers, the two end covers are respectively buckled on the protrusions at both ends of the shaft sleeve, the circuit breaker main shaft also penetrates through the end covers, the two end covers are also respectively abutted with the inner walls of both sides of the cam bracket, both the end covers are provided with ring platforms, and the sidewalls of both sides of the cam bracket are provided with openings for the plug-in of the ring platforms.

[0007] The cam piece comprises integrally formed first cam connecting pieces, second cam connecting pieces and a crossbeam, the first cam connecting pieces and the second cam connecting pieces are structurally identical and symmetrical along the crossbeam, the two ends of the cross pin are matched with the first cam connecting pieces and the second cam connecting pieces respectively, and the two side inner walls of the cam support are recessed with sliding grooves for the cross pin to extend into.

[0008] The cam support comprises a first support body and a second support body which are buckled with each other, the edge of the first support body is protruded with a clamping block, the edge of the second support body is recessed with a clamping groove matched with the clamping block, and the clamping block and the clamping groove are matched in clamping.

[0009] The inner corners of the cam support are all circular arc corners.

[0010] The outer wall of the cam support is provided with a process hole corresponding to the position of the sliding groove.

[0011] The cam support is further provided with a side support, one end of the side support is connected with the cam support and the other end is connected with a vacuum tube, and the side support further penetrates through an insulation frame.

[0012] The insulation frame is further provided with a first isolation insulation seat, a second isolation insulation seat, a disconnecting switch and a grounding assembly, the grounding assembly comprises a grounding connecting piece and a grounding moving contact provided on the grounding connecting piece, the first isolation insulation seat and the second isolation insulation seat are fixed in clamping with the insulation frame, and the first isolation insulation seat and the second isolation insulation seat are made of epoxy resin material.

[0013] The disconnecting switch comprises a knife switch and an arc-shaped moving contact box, the moving contact box drives the knife switch to rotate, the two ends of the moving contact box are provided with openings matched with the knife switch, the side wall of the opening is provided with an adjusting hole, the adjusting hole is buckled with a cover plate, the middle part of the moving contact box is provided with an operation shaft, the moving contact box rotates along the operation shaft, and the disconnecting switch further comprises two magnetic lock pieces, the two magnetic lock pieces are installed on the two sides of the knife switch through bolts.

[0014] The main shaft of the circuit breaker is a prism, the inner wall of the shaft sleeve is a prismatic surface matched with the prism, the detachable assembly further comprises a C-shaped buckle, the C-shaped buckle is buckled on the outer wall of the shaft sleeve, one side of the C-shaped buckle is provided with a gap, and the distance between the gap is smaller than the width of the side cover.

[0015] The C-shaped buckle comprises a first buckle body and a second buckle body which are distributed along the shaft sleeve in the axial direction, an inner ring groove is formed in the inner wall of the first buckle body, an outer ring groove is formed in the outer wall of the second buckle body, the inner ring groove and the outer ring groove are buckled with each other to form a mounting portion, a special-shaped spring is arranged in the mounting portion, the special-shaped spring pushes the first buckle body and the second buckle body in the direction away from each other, the first buckle body is abutted with a first cam connecting piece through the special-shaped spring, the second buckle body is abutted with a second cam connecting piece through the special-shaped spring, and the two ends of the special-shaped spring are respectively provided with a plug pin, and the two plug pins are respectively inserted and fixed with the side wall of the inner ring groove and the side wall of the outer ring groove.

[0016] The cam part of the application is wrapped inside the cam support, the pressure equalizing cavity inside the cam support is used for equalizing the electric field, so that the electric field is uniformly distributed, the insulation capacity is stronger, and the sliding groove of the cam support is used for guiding the movement path of the connecting column, the sliding groove is a strip-shaped groove extending in the axial direction of the connecting column, the connecting column is matched by extending into the sliding groove through the cross pin, the cross pin reciprocatingly slides in the sliding groove, the connecting column can stably move linearly up and down, plays a guiding role, and ensures the stable work of the circuit breaker. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor, which still belong to the scope of the present application.

[0018] Figure 1 It is a structural schematic diagram of the three-position switch of the circuit breaker of the present application;

[0019] Figure 2 It is a structural schematic diagram of the present application removing an insulating frame;

[0020] Figure 3 It is a structural schematic diagram of the circuit breaker main body in the present application;

[0021] Figure 4 It is a structural schematic diagram of the circuit breaker main body removing the second frame body;

[0022] Figure 5 It is a structural schematic diagram of the first frame body in the present application;

[0023] Figure 6 It is a structural schematic diagram of the moving contact box in the present application;

[0024] Figure 7 It is a structural schematic diagram of the cooperation between the cam part and the circuit breaker main shaft in the present application;

[0025] Figure 8 It is an exploded schematic view of the cam member in the present application;

[0026] Figure 9 It is an exploded schematic view of the cam member and the cam support in the present application;

[0027] Figure 10 It is a structural schematic view of the cam member in the present application;

[0028] Figure 11 It is a partial enlarged schematic view of A in the figure; Figure 10

[0029] Figure 12 It is a partial enlarged schematic view of the end of the moving contact box in the present application;

[0030] In the figure, 1 is an insulation frame, 2 is a circuit breaker main shaft, 3 is a cam member, 4 is a vacuum tube, 5 is a connecting column, 6 is a cross pin, 7 is a cam support, 8 is a pressure equalizing cavity, 9 is a sliding groove, 10 is a first cam connecting piece, 11 is a second cam connecting piece, 12 is a cross beam, 13 is a first frame body, 14 is a second frame body, 15 is a clamping block, 16 is a clamping groove, 17 is a process hole, 18 is a side frame, 19 is a first isolation insulation seat, 20 is a second isolation insulation seat, 21 is a grounding connecting piece, 22 is a grounding static contact, 23 is a knife switch, 24 is a moving contact box, 25 is an opening, 26 is an adjusting hole, 27 is a cover plate, 28 is an operation shaft, 29 is a side cover, 30 is a plug-in block, 31 is a plug-in groove, 32 is a shaft sleeve, 33 is a boss, 34 is an end cover, 35 is a ring table, 36 is an opening, 37 is a C-shaped buckle, 38 is a notch, 39 is a first buckle body, 40 is a second buckle body, 41 is an inner ring groove, 42 is an outer ring groove, 43 is a mounting part, 44 is a special-shaped spring, 45 is a plug pin, 46 is a magnetic lock piece, and 47 is a bolt. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings.

[0032] It should be noted that all the expressions of "first" and "second" in the embodiments of the present application are used to distinguish two same name different entities or different parameters. It can be seen that "first" and "second" are only used for the convenience of description, and should not be understood as a limitation on the embodiments of the present application. The subsequent embodiments will not be described one by one.

[0033] The directions and positions mentioned in the present application, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc. are only the directions or positions of the drawings. Therefore, the directions and positions used are used to illustrate and understand the present application, and are not a limitation on the scope of protection of the present application.​

[0034] As Figures 1 to 12 shown, as an embodiment of the present application, the circuit breaker three-position switch comprises an insulating frame 1 and a circuit breaker body arranged on the insulating frame 1, the circuit breaker body comprises a circuit breaker main shaft 2, a cam member 3 and a vacuum tube 4, the circuit breaker main shaft 2 drives the cam member 3 to rotate, one end of the vacuum tube 4 is provided with a connecting column 5, the connecting column 5 is matched with the cam member 3 through a cross pin 6, a cam support 7 is further arranged on the insulating frame 1 through a fastener, the cam support 7 covers the outside of the cam member 3, and a pressure equalizing cavity 8 for rotating the cam member 3 is arranged in the cam support 7, the circuit breaker main shaft 2 penetrates the cam support 7, and a sliding groove 9 for the cross pin 6 to extend into is recessed in the inner wall of the cam support 7;

[0035] A side cover 29 is detachably connected to the cam member 3, both sides of the side cover 29 are provided with plug-in blocks 30, the cam member 3 is provided with plug-in grooves 31 matched with the plug-in blocks 30, the side cover 29 and the cam member 3 are connected to form a shaft sleeve 32 matched with the circuit breaker main shaft 2, both ends of the shaft sleeve 32 are provided with protruding bosses 33, the cam member 3 is further connected with the circuit breaker main shaft 2 through a detachable assembly, the detachable assembly comprises two end covers 34, the two end covers 34 are respectively buckled on the bosses 33 at both ends of the shaft sleeve 32, the circuit breaker main shaft 2 also penetrates the end covers 34, the two end covers 34 are respectively abutted with the inner walls of both sides of the cam support 7, and the two end covers 34 are respectively provided with ring bosses 35, and the sidewalls of both sides of the cam support 7 are provided with openings 36 for plug-in of the ring bosses 35.

[0036] The beneficial effects of such arrangement are as follows, the cam member of the present application is wrapped in the cam support, the pressure equalizing cavity in the cam support is used for equalizing electric field, so that the electric field is uniformly distributed and the insulation capacity is stronger, and the sliding groove of the cam support is used for guiding the movement path of the connecting column, the sliding groove is a strip-shaped groove extending along the axial direction of the connecting column, the connecting column is matched by extending into the sliding groove through the cross pin, the cross pin reciprocatingly slides in the sliding groove, and the connecting column can stably move linearly up and down, thereby playing a guiding role and ensuring stable work of the circuit breaker.

[0037] The side cover is installed on the cam member through the cooperation of the insertion block and the insertion slot on the cam member, and the side cover and the cam member form a shaft sleeve matched with the circuit breaker main shaft, the cam member is driven to rotate by the circuit breaker main shaft through the shaft sleeve, and the cam member can be removed from the circuit breaker main shaft when the side cover is removed, so that the cam member is convenient to disassemble and replace, because the cam member needs to be frequently rotated and matched with the cross pin, the wear of the cam member is usually large and needs to be frequently replaced, the cam member can be quickly replaced and repaired through the disassembly of the side cover, and the circuit breaker main shaft does not need to be removed, the circuit breaker main shaft is connected with three stations at the same time, the cam members of each station can be individually disassembled, an end cover is buckled at each end of the shaft sleeve, the end cover is not only buckled and matched with the boss of the shaft sleeve, but also can fix the side cover on the cam member, the ring table of the end cover is further inserted and matched with the opening of the cam support, the end surface of the end cover is abutted with the inner wall of the cam support, the end cover is firmly installed on the inner side of the cam support, the end cover can limit the side cover in the radial direction, does not hinder the rotation of the side cover and the cam member, and has the advantages of compact structure.

[0038] Further setting, the cam member 3 comprises integrally formed first cam connecting piece 10, second cam connecting piece 11 and cross beam 12, the first cam connecting piece 10 and the second cam connecting piece 11 are the same structure and symmetrical along the cross beam 12, the two ends of the cross pin 6 are matched with the first cam connecting piece 10 and the second cam connecting piece 11 respectively, and the inner walls of the two sides of the cam support 7 are recessed with sliding grooves 9 for the cross pin 6 to extend into.

[0039] The beneficial effects of such setting are as follows, the first cam connecting piece and the second cam connecting piece are matched with the two ends of the cross pin respectively, the two ends of the cross pin can also be matched with the sliding grooves, the two ends are uniformly stressed, and the transmission is more stable, the first cam connecting piece and the second cam connecting piece are connected through the cross beam and integrally formed, synchronous rotation is ensured, and resistance and bounce to the connecting column are prevented.

[0040] Further setting, the cam support 7 comprises first frame body 13 and second frame body 14 which are buckled with each other, the edge of the first frame body 13 is protruded with clamping block 15, the edge of the second frame body 14 is recessed with clamping groove 16 matched with the clamping block 15, and the clamping block 15 is clamped and matched with the clamping groove 16.

[0041] The beneficial effects of such setting are as follows, the cam support adopts a split structure, is convenient to disassemble, is clamped and matched through the clamping of the clamping block and the clamping groove after installation, prevents the relative rotation of the first frame body and the second frame body, and ensures the firm fixation of the cam support.

[0042] Further setting, the inner corners of the cam support 7 all adopt circular arc corners.

[0043] The beneficial effects of such setting are as follows, the circular arc corners further help the uniform distribution of the electric field.

[0044] Further, the outer wall of the cam support 7 is provided with a process hole 17 corresponding to the position of the sliding groove 9.

[0045] The process hole is used for inserting a tool such as a screw rod screw in the prior art, and the screw rod screw drives the transverse pin to move up and down to test the mechanical properties of the circuit breaker.

[0046] Further, the side frame 18 is further provided, one end of the side frame 18 is connected with the cam support 7 and the other end is connected with the vacuum tube 4, and the side frame 18 also passes through the insulating frame 1.

[0047] The beneficial effects of such an arrangement are as follows: the vacuum tube and the cam support are connected through the side frame, which further improves the structural strength and stability of the transmission of the circuit breaker.

[0048] Further, the insulating frame 1 is further provided with a first isolation insulating seat 19, a second isolation insulating seat 20, a disconnecting switch and a grounding assembly, the grounding assembly includes a grounding connecting piece 21 and a grounding static contact 22 arranged on the grounding connecting piece 21, the first isolation insulating seat 19 and the second isolation insulating seat 20 are clamped and fixed with the insulating frame 1, and the first isolation insulating seat 19 and the second isolation insulating seat 20 are made of epoxy resin material.

[0049] The beneficial effects of such an arrangement are as follows: the grounding assembly and the disconnecting switch are integrated on the insulating frame, realizing the main function of the circuit breaker, the structure is compact, the production cost is lower, and the insulating frame also adopts a two-piece split structure, the first isolation insulating seat and the second isolation insulating seat are clamped and connected with each insulating frame, and are firmly fixed between the two insulating frames.

[0050] Further, the disconnecting switch includes a knife switch 23 and an arc-shaped moving contact box 24, the moving contact box 24 drives the knife switch 23 to rotate, and both ends of the moving contact box 24 are provided with an open mouth 25 for cooperation with the knife switch 23, the side wall of the open mouth 25 is provided with an adjusting hole 26, the adjusting hole 26 is buckled with a cover plate 27, the middle of the moving contact box 24 is provided with an operation shaft 28, the moving contact box 24 rotates along the operation shaft 28, and further includes two magnetic lock pieces 46, the two magnetic lock pieces 46 are installed on both sides of the knife switch 23 through bolts 47.

[0051] The beneficial effects of such an arrangement are as follows: the movable contact box rotates along the operating shaft and drives the knife switch to rotate, thereby achieving switching between the closing, opening and grounding of the disconnecting switch; the movable contact box has an arc shape, which greatly reduces the inertia of rotation compared to the linear shape of the prior art; the adjusting hole of the cover plate is used to adjust the pressure of the end contact of the knife switch; when adjustment is needed, the cover plate can be removed to see the knife switch, and the cover plate can also prevent arc propagation, thereby improving reliability and operational safety; when the knife switch is powered on, the two magnetic locking pieces generate electromagnetic force, and under the action of the electromagnetic force, the magnetic locking pieces are magnetically attracted to each other and clamp the knife switch, thereby increasing the contact pressure and improving the stability of power supply.

[0052] Further arrangement, the circuit breaker main shaft 2 adopts a prism, the inner wall of the shaft sleeve 32 is a prismatic surface matched with the prism, the detachable assembly further comprises a C-shaped buckle 37, the C-shaped buckle 37 is buckled on the outer wall of the shaft sleeve 32, one side of the C-shaped buckle 37 is provided with a gap 38, and the gap 38 has a smaller spacing than the width of the side cover 29.

[0053] The beneficial effects of such an arrangement are as follows: the friction between the prismatic circuit breaker main shaft and the shaft sleeve is greater, which more effectively drives the cam member to rotate; the C-shaped buckle is made of a high-resilience material and can be buckled on the outer wall of the shaft sleeve; the gap of the C-shaped buckle is smaller than the width of the side cover, so the side cover can be further limited and fixed to prevent loosening; when the C-shaped buckle needs to be removed, the gap is enlarged by bending the two ends of the C-shaped buckle until the gap is greater than the diameter of the shaft sleeve, and the C-shaped buckle can be removed; because of the characteristics of the high-resilience material, the C-shaped buckle can still be used by buckling it back in the same way, and it has strong durability.

[0054] Further arrangement, the C-shaped buckle 37 comprises a first buckle body 39 and a second buckle body 40 distributed along the shaft sleeve 32 in the axial direction, an inner ring groove 41 is formed in the inner wall of the first buckle body 39, an outer ring groove 42 is formed in the outer wall of the second buckle body 40, the inner ring groove 41 and the outer ring groove 42 are buckled with each other to form a mounting portion 43, a special-shaped spring 44 is arranged in the mounting portion 43, the special-shaped spring 44 pushes the first buckle body 39 and the second buckle body 40 away from each other, the first buckle body 39 abuts against the first cam connecting piece 10 through the special-shaped spring 44, the second buckle body 40 abuts against the second cam connecting piece 11 through the special-shaped spring 44, and one plug pin 45 is arranged at each end of the special-shaped spring 44, and the two plug pins 45 are respectively inserted and fixed with the side walls of the inner ring groove 41 and the outer ring groove 42.

[0055] The beneficial effects of such arrangement are as follows: the first buckle body and the second buckle body are moved to the two sides by the special-shaped spring and abut against the first cam connecting piece and the second cam connecting piece respectively, thereby greatly increasing the contact area with the cam piece, the C-shaped buckle can rotate together with the cam piece, further preventing loosening, and the installation is more stable; the movable installation structure makes disassembly very simple; by pressing the first buckle body towards the second buckle body, the first buckle body can be disassembled first and then the second buckle body, thereby saving labor for disassembly; the two ends of the special-shaped spring are further inserted and fixed with the inner ring groove of the first buckle body and the outer ring groove of the second buckle body through the latch, for preventing the first buckle body and the second buckle body from rotating relative to each other, thereby preventing loosening; the special-shaped spring provides greater elasticity and can prevent twisting; and the cam piece can ensure synchronous rotation of the first cam connecting piece and the second cam connecting piece and can be conveniently disassembled, replaced and maintained through the side cover and the detachable assembly.

[0056] The above only discloses preferred embodiments of the present application, and of course cannot limit the scope of the rights of the present application, so equivalent changes made according to the claims of the present application are still within the scope of the present application.

Claims

1. Circuit breaker three-position switch, characterized by: The invention comprises an insulating frame (1) and a circuit breaker body arranged on the insulating frame (1), wherein the circuit breaker body comprises a circuit breaker main shaft (2), a cam member (3) and a vacuum tube (4), wherein the circuit breaker main shaft (2) drives the cam member (3) to rotate, and a connecting column (5) is provided at one end of the vacuum tube (4), and the connecting column (5) cooperates with the cam member (3) through a transverse pin (6); a cam bracket (7) is further mounted on the insulating frame (1) through a fastener, the cam bracket (7) is covered on the outside of the cam member (3), and a pressure equalizing chamber (8) is provided inside the cam bracket (7) for the cam member (3) to rotate, the circuit breaker main shaft (2) passes through the cam bracket (7), and the inner wall of the cam bracket (7) is further recessed with a slide groove (9) for the transverse pin (6) to extend into; The cam member (3) is detachably connected to a side cover (29), and both sides of the side cover (29) are provided with a plug-in block (30). The cam member (3) is provided with a plug-in slot (31) adapted to the plug-in block (30). The side cover (29) and the cam member (3) are connected to form a shaft sleeve (32) adapted to the circuit breaker main shaft (2), and both ends of the shaft sleeve (32) are raised with a boss (33). The cam member (3) is also connected to the circuit breaker main shaft (2) through a detachable component. 2) connection, the detachable component includes two end covers (34), the two end covers (34) are respectively engaged with the bosses (33) at both ends of the shaft sleeve (32), the circuit breaker main shaft (2) also passes through the end covers (34), the two end covers (34) are also respectively against the inner walls of both sides of the cam bracket (7), the two end covers (34) are both raised with a ring platform (35), and the side walls of both sides of the cam bracket (7) are provided with an opening (36) for the ring platform (35) to be inserted.

2. The three-position switch for circuit breaker according to claim 1, characterized in that: The cam member (3) comprises an integrally formed first cam connecting piece (10), a second cam connecting piece (11) and a cross beam (12); the first cam connecting piece (10) and the second cam connecting piece (11) have the same structure and are symmetrical along the cross beam (12); the two ends of the cross pin (6) respectively cooperate with the first cam connecting piece (10) and the second cam connecting piece (11); and the inner walls on both sides of the cam bracket (7) are recessed with a slide groove (9) for the cross pin (6) to extend into.

3. The three-position switch for circuit breaker according to claim 1, characterized in that: The cam bracket (7) comprises a first frame body (13) and a second frame body (14) that are interlocked, wherein a block (15) is protruded from an edge of the first frame body (13), and a slot (16) that matches the block (15) is recessed from an edge of the second frame body (14), and the block (15) is engaged with the slot (16).

4. The three-position switch for circuit breaker according to claim 1, characterized in that: The inner angles of the cam bracket (7) are all arc angles.

5. The three-position switch for circuit breaker according to claim 1, characterized in that: A process hole (17) is provided on the outer wall of the cam bracket (7) at a position corresponding to the slide groove (9).

6. The three-position switch for circuit breaker according to claim 1, characterized in that: It also includes a side frame (18), one end of the side frame (18) is connected to the cam bracket (7) and the other end is connected to the vacuum tube (4), and the side frame (18) also passes through the insulating frame (1).

7. The three-position switch for circuit breaker according to claim 1, characterized in that: The insulating frame (1) is further provided with a first isolating insulating seat (19), a second isolating insulating seat (20), an isolating switch and a grounding assembly, wherein the grounding assembly comprises a grounding connecting plate (21) and a grounding static contact (22) arranged on the grounding connecting plate (21), the first isolating insulating seat (19) and the second isolating insulating seat (20) are both fixedly connected to the insulating frame (1), and the first isolating insulating seat (19) and the second isolating insulating seat (20) are both made of epoxy resin.

8. The three-position switch for circuit breaker according to claim 7, characterized in that: The isolating switch comprises a knife switch (23) and an arc-shaped moving contact box (24), wherein the moving contact box (24) drives the knife switch (23) to rotate, and both ends of the moving contact box (24) are provided with openings (25) for the knife switch (23) to cooperate with, and the side wall of the opening (25) is provided with an adjustment hole (26), and the adjustment hole (26) is fastened with a cover plate (27), and an operating shaft (28) is provided in the middle of the moving contact box (24), and the moving contact box (24) rotates along the operating shaft (28), and further comprises two magnetic locking pieces (46), and the two magnetic locking pieces (46) are mounted on both sides of the knife switch (23) by bolts (47).

9. The three-position switch for circuit breaker according to claim 2, characterized in that: The circuit breaker main shaft (2) is a prism, the inner wall of the shaft sleeve (32) is a prismatic surface adapted to the prism, and the detachable component further comprises a C-shaped buckle (37), the C-shaped buckle (37) being buckled on the outer wall of the shaft sleeve (32), a notch (38) being provided on one side of the C-shaped buckle (37), and a spacing of the notches (38) being smaller than a width of the side cover (29).

10. The three-position switch for circuit breaker according to claim 9, characterized in that: The C-shaped buckle (37) comprises a first buckle body (39) and a second buckle body (40) distributed along the axial direction of the shaft sleeve (32), the inner wall of the first buckle body (39) is provided with an inner ring groove (41), the outer wall of the second buckle body (40) is provided with an outer ring groove (42), the inner ring groove (41) and the outer ring groove (42) are engaged with each other to form a mounting portion (43), and a special-shaped spring (44) is provided in the mounting portion (43), and the special-shaped spring (44) holds the first buckle body ( The first buckle body (39) and the second buckle body (40) are pushed in a direction away from each other, the first buckle body (39) is in contact with the first cam connecting piece (10) through the special-shaped spring (44), and the second buckle body (40) is in contact with the second cam connecting piece (11) through the special-shaped spring (44), and a latch (45) is provided at each end of the special-shaped spring (44), and the two latches (45) are respectively plugged and fixed with the side wall of the inner ring groove (41) and the side wall of the outer ring groove (42).

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