Refusible rotating shaft system of circuit breaker

Abstract

A repulsion rotating shaft system of a circuit breaker comprises an installation support provided with a contact support, a moving contact provided with a rotating shaft, an upper driving shaft, a lower driving shaft and two elastic pieces, an assembling groove is formed in the contact support in a front-back penetrating mode, an installation cavity is further formed in the rear end of the contact support, and the upper end and the lower end of the installation cavity are arranged in a penetrating mode. Two first mounting grooves, two second mounting grooves and two third mounting grooves are further formed in the mounting cavity, the two ends of the rotating shaft are matched with the first mounting grooves in a limiting mode, the two ends of the upper driving shaft are matched with the second mounting grooves in a limiting mode, and the two ends of the lower driving shaft are matched with the third mounting grooves in a limiting mode; the third installation groove is in a horn mouth shape, the rotating end of the moving contact is further provided with a driving protruding part, the bottom face of the driving protruding part is a flat and straight face, the rotating face of the driving protruding part is further provided with a first limiting groove, and the lower driving shaft and the first limiting groove form first limiting fit. The device is convenient to mount and dismount, safe to use and reasonable in structural design.

Description

TECHNICAL FIELD

[0001] The utility model relates to low-voltage electrical appliance field especially relates to a circuit breaker's repulsive rotating shaft system. BACKGROUND

[0002] In the working process of the molded case circuit breaker, when a large fault short-circuit current appears in the line, the movable contact is repelled by the electric repulsive force to overcome the contact pressure before the operating mechanism acts, and the rotating shaft is stationary. The function of the movable contact locking structure is to make the movable contact stay at the maximum position after the movable and stationary contacts are repelled to the maximum opening distance, until the operating mechanism is tripped by the trip unit, so as to avoid the arc reignition caused by the falling of the movable contact due to the decrease of the fault short-circuit current. The existing movable contact locking structure is as follows: one is to use a connecting rod structure, when the connecting rod moves through the dead point, the movable contact is controlled not to fall, but this way has a complex structure and is inconvenient to assemble. SUMMARY

[0003] In view of the above-mentioned defects of the prior art, the utility model aims to provide a circuit breaker's repulsive rotating shaft system which is simple in structure, convenient to install and disassemble, reliable and safe in use.

[0004] The utility model solves its technical problem and adopts the technical scheme of a circuit breaker's repulsive rotating shaft system, which comprises a mounting bracket, a movable contact provided with a rotating shaft, an upper driving shaft, a lower driving shaft, and two elastic members. A contact support is arranged on the mounting bracket. An assembly slot is arranged through the contact support from front to back. The upper end of the assembly slot is also arranged through the front part of the contact support. The swinging end of the movable contact is extended from the assembly slot. The rotating end of the movable contact is rotatably arranged on the contact support through the rotating shaft. The upper driving shaft and the lower driving shaft are arranged on the upper and lower sides of the rotating direction of the rotating end of the movable contact. The two ends of the two elastic members are respectively limited on the upper driving shaft and the lower driving shaft. The rear end of the contact support further forms a mounting cavity. The upper and lower ends of the mounting cavity are arranged through. The rear end opening of the assembly slot is located at the corresponding position in the mounting cavity. Two first mounting slots, two second mounting slots, and two third mounting slots are further arranged in the mounting cavity. The first mounting slots are arranged with the lower end opening. The two ends of the rotating shaft are limited in the first mounting slots. The second mounting slots are arranged with the upper end opening. The two ends of the upper driving shaft are limited in the second mounting slots. The third mounting slots are arranged in the shape of a trumpet mouth with the lower end opening. The two ends of the lower driving shaft are limited in the third mounting slots. A driving protrusion is further arranged on the rotating end of the movable contact. The driving protrusion is in contact with the lower driving shaft. The bottom surface of the driving protrusion is a flat surface. The rotating surface of the driving protrusion is an arc surface and is provided with a first limiting slot at the corresponding position. The lower driving shaft and the first limiting slot form a first limiting fit.

[0005] The advantages of the above technical solution are as follows: By setting an installation cavity that mates with the assembly groove, and setting corresponding first, second, and third installation grooves within the installation cavity, during installation, firstly, the two ends of the rotating shaft on the rotating end of the moving contact in the assembly groove are inserted into the corresponding first installation groove. Then, the tops of the two elastic elements are hung on the upper drive shaft limit. Next, the two ends of the upper drive shaft are inserted into the corresponding second installation groove, and the two ends of the lower drive shaft are inserted into the corresponding third installation groove. Finally, the bottoms of the elastic elements are hung on the upper limit limit of the lower drive shaft using hooks or other tools. When disassembly is required, the elastic elements can be replaced simply by using hooks or other tools to release the limit between the elastic elements and the upper or lower drive shaft. Furthermore, after the above structure is installed in place, the moving contact, through the driving protrusion on its rotating end, mates with the upper and lower drive shafts. The design effectively limits the movement and provides a certain degree of elastic holding force. The first and third mounting slots are designed with lower openings, while the second mounting slot is designed with an upper opening, resulting in a more rational layout. The third mounting slot is also flared, preventing jamming during the engagement of the lower drive shaft with the drive protrusion and ensuring smoother operation. The top of the drive protrusion is flat, allowing for more stable contact when the rotating end of the moving contact presses against the lower drive shaft. Furthermore, the first limiting slot prevents the lower drive shaft from being locked in place at the moment of opening, achieving a self-holding state and effectively preventing the moving contact from falling and reigniting its arc. Therefore, the overall structure is simple, easy to install and disassemble, reliable, and safe to use, with a reasonable structural design.

[0006] Furthermore, a second limiting groove is provided at the top of the rotating surface of the driving protrusion, and the lower driving shaft forms a second limiting engagement with the second limiting groove.

[0007] The advantages of adopting the above technical solution are as follows: when the lower drive shaft is released from the first limiting groove, the moving contact will continue to swing. By setting the second limiting groove, the maximum swing angle of the moving contact can be limited, thereby avoiding excessive swing of the moving contact and ensuring the safety and reliability of use.

[0008] Furthermore, the elastic element is a tension spring, and there is a clearance recess between the two side walls of the driving protrusion and the corresponding wall of the mounting cavity. The clearance recess is provided corresponding to the spiral part of the elastic element.

[0009] The advantages of adopting the above technical solution are: by setting appropriate avoidance recesses to effectively avoid the elastic element, the deformation reliability of the elastic element is guaranteed, and the structure of the contact support is compact and the space occupied is reasonable.

[0010] Furthermore, the upper drive shaft has an upper hook groove with an annular structure at both ends, and the lower drive shaft has a lower hook groove with an annular structure at the corresponding positions at both ends. The two ends of the elastic element form a third limiting engagement with the corresponding upper hook groove and the lower hook groove.

[0011] The advantages of adopting the above technical solution are: by setting the corresponding upper hook groove and lower hook groove, the elastic element can be confined to the upper drive shaft and the lower drive shaft after installation, making the movement of the elastic element more stable and the structural design reasonable.

[0012] Furthermore, the mounting cavity has an upper clearance opening directly above the assembly groove, and the mounting cavity has a lower clearance opening directly below the assembly groove. Both the upper clearance opening and the lower clearance opening are arranged to extend through the front and back and cooperate with the swing end of the moving contact.

[0013] The advantages of adopting the above technical solution are: the setting of the upper and lower clearance openings realizes the clearance of the swing end of the moving contact to swing up and down, making the swing end of the moving contact swing more reasonable and safe, and also making the contact support structure more compact and occupying more reasonable space.

[0014] Furthermore, the contact support is also provided with a support protrusion, which is disposed between the upper drive shaft and the front wall surface of the mounting cavity.

[0015] The advantages of adopting the above technical solution are: by setting support protrusions at the corresponding positions, the support protrusions can form support for the upper drive shaft body, thereby improving the service life of the upper drive shaft and making the structural design reasonable.

[0016] Furthermore, the mounting bracket is also provided with a connecting shaft, and a positioning ring rib is formed on the peripheral wall surface of the connecting shaft, which cooperates with the positioning ring groove in the circuit breaker housing.

[0017] The advantages of adopting the above technical solution are: by setting a positioning ring rib on the connecting shaft, the installation position of the mounting bracket inside the circuit breaker housing is effectively limited, which effectively improves the reliability of use.

[0018] Furthermore, the bottom of the rotating end of the moving contact is provided with a fourth mounting groove, which is used to install the contact element.

[0019] The advantages of the above technical solution are: by setting the fourth mounting groove, the installation position of the contact element is effectively limited, ensuring the stability of the cooperation between the moving contact and the stationary contact. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the mounting bracket structure of this utility model. Figure One ;

[0022] Figure 3 This is a schematic diagram of the mounting bracket structure of this utility model. Figure Two ;

[0023] Figure 4 This is a cross-sectional view of the mounting bracket structure of this utility model;

[0024] Figure 5 This is a partial exploded view of the structure of this utility model;

[0025] Figure 6 This is a schematic diagram of the moving contact structure of this utility model.

[0026] In the diagram: 1-Mounting bracket, 2-Moving contact, 3-Rotating shaft, 4-Upper drive shaft, 5-Lower drive shaft, 6-Elastic element, 7-Contact support, 8-Assembly groove, 9-Mounting cavity, 10-First mounting groove, 11-Second mounting groove, 12-Third mounting groove, 13-Drive protrusion, 14-First limiting groove, 15-Second limiting groove, 16-Avoidance recess, 17-Upper hook groove, 18-Lower hook groove, 19-Upper avoidance opening, 20-Lower avoidance opening, 21-Supporting protrusion, 22-Connecting shaft, 23-Positioning ring rib, 24-Fourth mounting groove. Detailed Implementation

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model and / or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort. Furthermore, references to orientation only indicate the relative positional relationship between the components, not their absolute positional relationship.

[0028] Please see Figures 1 to 6As shown, a repulsive rotating shaft system for a circuit breaker includes a mounting bracket 1, a moving contact 2 with a rotating shaft 3, an upper drive shaft 4, a lower drive shaft 5, and two elastic members 6. The mounting bracket 1 has a contact support 7, and the contact support 7 has a through-groove 8 extending from front to back. The upper end of the assembly groove 8 is also through-connected to the front of the contact support 7. The swing end of the moving contact 2 extends out of the assembly groove 8, and the rotating end of the moving contact 2 is rotatably mounted on the contact support 7 via the rotating shaft 3. The upper drive shaft 4 and lower drive shaft 5 are positioned on the upper and lower sides in the direction of rotation of the rotating end of the moving contact 2. The two ends of the two elastic members 6 are respectively upper limited by the upper drive shaft 4 and lower drive shaft 5. A mounting cavity 9 is also formed at the rear end of the contact support 7, with the upper and lower ends of the mounting cavity 9 being through-connected. The rear opening of the assembly groove 8 is located within the mounting cavity. At corresponding positions within the mounting cavity 9, two first mounting grooves 10, two second mounting grooves 11, and two third mounting grooves 12 are also provided. The first mounting groove 10 is open at the lower end, and the two ends of the rotating shaft 3 are limited and fitted with the first mounting groove 10. The second mounting groove 11 is open at the upper end, and the two ends of the upper drive shaft 4 are limited and fitted with the second mounting groove 12. The third mounting groove 12 is shaped like a trumpet with an open lower end, and the two ends of the lower drive shaft 5 are limited and fitted with the third mounting groove 12. The rotating end of the moving contact 2 is also provided with a driving protrusion 13, which abuts against the lower drive shaft 5. The bottom surface of the driving protrusion 13 is a flat surface, and the rotating surface of the driving protrusion 13 is an arc-shaped surface with a first limiting groove 14 at a corresponding position. The lower drive shaft 5 and the first limiting groove 14 form a first limiting fit.

[0029] In the above structure, by setting an installation cavity 9 that mates with the assembly groove 8, and setting a first installation groove 10, a second installation groove 11, and a third installation groove 12 with corresponding structures in the installation cavity 9, during installation, first insert the two ends of the rotating shaft 3 on the rotating end of the moving contact 2 in the assembly groove 8 into the corresponding first installation groove 10, then hang the tops of the two elastic elements 6 on the upper drive shaft 4 limit, then insert the two ends of the upper drive shaft 4 into the corresponding second installation groove 11, then insert the two ends of the lower drive shaft 5 into the corresponding third installation groove 12, and finally use hooks or other tools to hang the bottoms of the elastic elements 6 onto the upper limit limit of the lower drive shaft 5 respectively. When disassembly is required, simply use hooks or other tools to release the elastic elements 6 from the upper drive shaft 4 or the lower drive shaft 5 to replace the elastic elements 6. After the above structure is installed in place, the moving contact 2 connects with the upper drive shaft 4 and the lower drive shaft 5 through the drive protrusion 13 on the rotating end. With proper coordination, the device effectively limits the movement and provides a certain degree of elastic holding force. The first mounting groove 10 and the third mounting groove 12 are designed with lower openings, and the second mounting groove 11 is designed with an upper opening, resulting in a more rational layout. The third mounting groove 12 is also designed in a flared shape, which prevents the lower drive shaft 5 from jamming during its engagement with the drive protrusion 13, ensuring smoother operation. The top of the drive protrusion 13 is also designed as a flat surface, making it more stable when the rotating end of the moving contact 2 is pressed against the lower drive shaft 5 by the drive protrusion 13. Furthermore, by providing a first limiting groove 14, the lower drive shaft 5 is locked in the first limiting groove 14 at the moment of opening, thus achieving a self-holding state and effectively preventing the moving contact 2 from falling and avoiding arc reignition. Therefore, the overall structure is simple, easy to install and disassemble, reliable, and safe to use, with a reasonable structural design.

[0030] In this embodiment, a second limiting groove 15 is also provided on the top of the rotating surface of the drive protrusion 13. That is, the second limiting groove 15 is located on the rotating rear side of the first limiting groove 14, and the lower drive shaft 5 can also form a second limiting engagement with the second limiting groove 15. During the opening process, the lower drive shaft 5 is released from the limiting of the first limiting groove 14, and the moving contact 2 will continue to swing. Therefore, by setting the second limiting groove 15, when it rotates to the set angle, the lower drive shaft 5 will be stuck in the second limiting groove 15 to limit the maximum swing angle of the moving contact 2, thereby avoiding the phenomenon of excessive swing of the moving contact 2 and ensuring the safety and reliability of use.

[0031] In this embodiment, the elastic element 6 is a tension spring. There is a clearance recess 16 between the two side walls of the driving protrusion 13 and the corresponding wall of the mounting cavity 9. The clearance recess 16 is provided corresponding to the spiral part of the elastic element 5. By providing the corresponding clearance recess 16, the elastic element 6 can be effectively clearanceed, ensuring the deformation reliability of the elastic element 6. It also makes the structure of the contact support 7 compact and the space occupied is reasonable.

[0032] In this embodiment, the upper drive shaft 4 is provided with an annular upper hook groove 17 at both ends, and the lower drive shaft 5 is provided with an annular lower hook groove 18 at the corresponding positions at both ends. The two ends of the elastic member 6 form a third limiting fit with the corresponding upper hook groove 17 and lower hook groove 18. By setting the corresponding upper hook groove 17 and lower hook groove 18, the elastic member 6 can be limited to the upper drive shaft 4 and the lower drive shaft 5 after installation, making the movement of the elastic member 6 more stable and the structural design reasonable.

[0033] In this embodiment, the mounting cavity 9 has an upper clearance opening 19 directly above the assembly groove 8, and a lower clearance opening 20 is formed directly below the assembly groove 8. Both the upper clearance opening 19 and the lower clearance opening 20 are arranged to pass through each other and cooperate with the swing end of the moving contact 2. The arrangement of the upper clearance opening 19 and the lower clearance opening 20 realizes the clearance of the swing end of the moving contact 2 swinging up and down, making the swing end of the moving contact 2 swing more reasonably and safely, and also making the structure of the contact support 7 more compact and the space occupied more reasonably.

[0034] In this embodiment, the contact support 7 is also provided with a support protrusion 21. The support protrusion 21 is positioned between the upper drive shaft 4 and the front wall of the mounting cavity 9. By providing the support protrusion 21 at the corresponding position, the support protrusion 21 can provide support for the shaft body of the upper drive shaft 4, thereby improving the service life of the upper drive shaft 4. The structure design is reasonable.

[0035] In this embodiment, there are three contact supports 7. Therefore, the mounting bracket 1 is also provided with a connecting shaft 22. The connecting shaft is located between two adjacent contact supports 7. A positioning ring rib 23 is formed on the peripheral wall surface of the connecting shaft 22. The positioning ring rib 23 cooperates with the positioning ring groove in the circuit breaker housing. By setting the positioning ring rib 23 on the connecting shaft 22, the installation position of the mounting bracket 1 in the circuit breaker housing is effectively limited, which effectively improves the reliability of use.

[0036] In this embodiment, a fourth mounting groove 24 is provided at the bottom of the rotating end of the moving contact 2. The fourth mounting groove 24 is used to install the contact element. By setting the fourth mounting groove 24, the installation position of the contact element is effectively limited, ensuring the stability of the cooperation between the moving contact 2 and the stationary contact.

[0037] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A repulsive rotating shaft system for a circuit breaker, comprising a mounting bracket (1), a moving contact (2) with a rotating shaft (3), an upper drive shaft (4), a lower drive shaft (5), and two elastic members (6), wherein the mounting bracket (1) is provided with a contact support (7), and the contact support (7) is provided with a through-groove (8), the upper end of the assembly groove (8) is also through-groove to the front of the contact support (7), the swing end of the moving contact (2) extends out of the assembly groove (8), the rotating end of the moving contact (2) is rotatably mounted on the contact support (7) via the rotating shaft (3), the upper drive shaft (4) and the lower drive shaft (5) are arranged on the upper and lower sides in the rotation direction of the rotating end of the moving contact (2), and the two ends of the two elastic members (6) are respectively upper limited by the upper drive shaft (4) and the lower drive shaft (5), characterized in that: The rear end of the contact support (7) also forms a mounting cavity (9), the upper and lower ends of the mounting cavity (9) are through, the rear end opening of the assembly groove (8) is located at the corresponding position inside the mounting cavity (9), the mounting cavity (9) is also provided with two first mounting grooves (10), two second mounting grooves (11) and two third mounting grooves (12), the first mounting grooves (10) are open at the lower end, and the two ends of the rotating shaft (3) are limited to fit the first mounting groove (10), the second mounting grooves (11) are open at the upper end, and the two ends of the upper drive shaft (4) are limited. In conjunction with the second mounting groove (11), the third mounting groove (12) is set in the shape of a flared mouth with an open bottom. The two ends of the lower drive shaft (5) are limited to the third mounting groove (12). The rotating end of the moving contact (2) is also provided with a driving protrusion (13). The driving protrusion (13) abuts against the lower drive shaft (5), and the bottom surface of the driving protrusion (13) is set as a flat surface. The rotating surface of the driving protrusion (13) is an arc surface and a first limiting groove (14) is provided at the corresponding position. The lower drive shaft (5) and the first limiting groove (14) form a first limiting fit.

2. The repulsive rotating shaft system of a circuit breaker according to claim 1, characterized in that: The top of the rotating surface of the drive protrusion (13) is also provided with a second limiting groove (15), and the lower drive shaft (5) forms a second limiting engagement with the second limiting groove (15).

3. The repulsive rotating shaft system of a circuit breaker according to claim 1, characterized in that: The elastic element (6) is a tension spring. There is a clearance recess (16) between the two side walls of the driving protrusion (13) and the corresponding wall of the mounting cavity (9). The clearance recess (16) is provided corresponding to the spiral part of the elastic element (6).

4. The repulsive rotating shaft system of a circuit breaker according to claim 1, characterized in that: The upper drive shaft (4) has an upper hook groove (17) with an annular structure at both ends, and the lower drive shaft (5) has a lower hook groove (18) with an annular structure at the corresponding positions at both ends. The two ends of the elastic member (6) form a third limiting fit with the corresponding upper hook groove (17) and lower hook groove (18).

5. The repulsive rotating shaft system of a circuit breaker according to claim 1, characterized in that: The mounting cavity (9) has an upper clearance opening (19) directly above the assembly groove (8), and the mounting cavity (9) has a lower clearance opening (20) directly below the assembly groove (8). The upper clearance opening (19) and the lower clearance opening (20) are both arranged to pass through each other and cooperate with the swing end of the moving contact (2).

6. The repulsive rotating shaft system of a circuit breaker according to claim 1, characterized in that: The contact support (7) is also provided with a support protrusion (21), which is positioned between the upper drive shaft (4) and the front wall of the mounting cavity (9).

7. The repulsive rotating shaft system of a circuit breaker according to claim 1, characterized in that: The mounting bracket (1) is also provided with a connecting shaft (22), and a positioning ring rib (23) is formed on the peripheral wall surface of the connecting shaft (22), and the positioning ring rib (23) cooperates with the positioning ring groove in the circuit breaker housing.

8. The repulsive rotating shaft system of a circuit breaker according to claim 1, characterized in that: The bottom of the rotating end of the moving contact (2) is also provided with a fourth mounting groove (24), which is used to install the contact element.

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