A molded case circuit breaker arc extinguishing system

Abstract

A kind of moulded case circuit breaker conducting arc extinguishing system, including static contact mechanism, and with static contact mechanism cooperation realizes on-off movable contact mechanism, static contact mechanism includes arc chamber, static contact and first insulating piece, arc chamber is located in the upper of static contact, arc chamber is made of two symmetrical half arc chamber assembly, the contact end of static contact is stretched into arc chamber, first insulating piece is set on the upper side of static contact, first insulating piece cooperates static contact with the arc chamber, movable contact mechanism includes pivot, movable contact and second insulating piece, pivot is equipped with contact support, movable contact is arranged on contact support in front-back direction, the contact end of movable contact is stretched into arc chamber to cooperate the contact end of static contact, second insulating piece is arranged on the contact end of movable contact, second insulating piece cooperates movable contact with arc chamber.The utility model structure design is reasonable, so that the use of moulded case circuit breaker is safer, service life is higher, and also more reliable.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage circuit breaker technology, and in particular to a conductive arc extinguishing system for a molded case circuit breaker. Background Technology

[0002] Molded case circuit breakers (MCCBs) are commonly used power distribution protection devices. They provide power supply to the load and overload and short-circuit protection, and are widely used in power distribution systems. Compared with miniature circuit breakers of the same specifications, MCCBs have advantages such as larger breaking current, stronger overload capacity, and more stable operation. However, the current design of the conductive arc-extinguishing system in MCCBs is unreasonable. The small electric arc exiting the arc-extinguishing chamber can damage the stationary and moving contacts during discharge, affecting their service life and making the circuit breaker unreliable, with a short service life and low safety. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a conductive arc extinguishing system for molded case circuit breakers, which has a reasonable structural design, making the use of molded case circuit breakers safer, longer service life, and more reliable.

[0004] The technical solution adopted by this utility model to solve its technical problem is a conductive arc-extinguishing system for a molded case circuit breaker, including a stationary contact mechanism and a moving contact mechanism that cooperates with the stationary contact mechanism to realize the switching. The stationary contact mechanism includes an arc-extinguishing chamber, a stationary contact, and a first insulating member. The arc-extinguishing chamber is located above the stationary contact and is composed of two symmetrical half-arc-extinguishing chambers assembled together. The contact end of the stationary contact extends into the arc-extinguishing chamber. The first insulating member is located on the upper side of the stationary contact and cooperates with the stationary contact and the arc-extinguishing chamber. The moving contact mechanism includes a rotating shaft, a moving contact, and a second insulating member. A contact support is provided on the rotating shaft. The moving contact passes through the contact support in the front-back direction. The contact end of the moving contact extends into the arc-extinguishing chamber to cooperate with the contact end of the stationary contact. The second insulating member is located on the contact end of the moving contact and cooperates with the moving contact and the arc-extinguishing chamber.

[0005] The advantages of adopting the above technical solution are as follows: By setting the first insulating component, the insulation effect between the arc-extinguishing chamber and the stationary contact is improved, effectively reducing the safety hazard of the stationary contact being burned out. By setting the second insulating component, the insulation effect between the arc-extinguishing chamber and the moving contact is improved, effectively reducing the safety hazard of the moving contact being burned out. This makes the use of the stationary and moving contacts safer. Furthermore, the arc-extinguishing chamber adopts a structure composed of two half arc-extinguishing chambers, achieving the purpose of modular disassembly and assembly, which facilitates the maintenance and replacement of components on one side, effectively enhancing maintainability and safety. Therefore, this conductive arc-extinguishing system can make the molded case circuit breaker safer to use, have a longer service life, and be more reliable in use.

[0006] Furthermore, each of the semi-extinguishing chambers includes a side plate and multiple spaced semi-extinguishing plates. Each semi-extinguishing plate is provided with a first connecting portion in the middle and a first extension portion on the side. The first extension portion causes the semi-extinguishing plate to be installed at a certain angle on the inner side of the side plate.

[0007] The advantages of the above technical solution are as follows: During installation, the semi-extinguishing arc plate is first installed on the side plate through the first extension to form a semi-extinguishing arc chamber. Then, the two assembled semi-extinguishing arc chambers are joined together so that the first mating part on the semi-extinguishing arc plate is connected, and the arc chamber can be assembled.

[0008] Furthermore, each of the semi-extinguishing chambers also includes a first cover and a second cover. The first cover is provided with a first front plate, and the second cover is provided with a second front plate. The second front plate is located above the first front plate. The side plate is positioned and connected with the first front plate and the second front plate. The first front plate and the second front plate are used to cover the front side of the first extension. The first front plate is also integrally provided with a first inner plate, and the second front plate is also integrally provided with a second inner plate. The first inner plate and the second inner plate are used to cover the inner side of the first extension.

[0009] The advantages of the above technical solution are as follows: By setting a first front plate with a first inner plate and a second front plate with a second inner plate, after being connected and positioned with the side plate, the front and inner sides of the first extension can be shielded, thereby preventing the molten metal particles generated by the broken molded case circuit breaker from cooling and depositing in the gap between the first extension and the moving contact. This also effectively reduces the safety hazard of the moving contact being burned, making the use of the moving contact safer. Furthermore, the separate structure of the first front plate and the second front plate reduces the molding difficulty.

[0010] Furthermore, a base plate is integrally provided below the first front plate, and the side plate is also positioned and connected with the base plate. A first docking inner plate and a second docking inner plate are integrally provided on the base plate. The first docking inner plate and the second docking inner plate are arranged in a front-to-back manner relative to the contact end of the stationary contact. A positioning protrusion is integrally provided on the second docking inner plate. The positioning protrusion is used to position the first insulating component.

[0011] The advantages of the above technical solution are as follows: by setting a base plate below the first front plate, the positioning and connection of the side plates are more reliable and the installation is simpler. It also provides some shielding for the bottom of the first extension. At the same time, by setting the first and second mating inner plates, the positioning and splicing of the two half-arc-extinguishing chambers are more reliable. When the two half-arc-extinguishing chambers are assembled, an opening will be formed, and the contact end of the stationary contact can be inserted into the arc-extinguishing chamber through the opening to achieve cooperation with the contact end of the moving contact. Furthermore, by setting positioning protrusions, the first insulating component is effectively fixed. The structural design is reasonable.

[0012] Furthermore, the first front plate is integrally provided with a first positioning plate, which is used to position the side plate on the outside. The second front plate is integrally provided with an upper plate, which is used to cover the upper side of the first extension. The upper plate is also integrally provided with a second positioning plate and a third docking inner plate, which is used to position the side plate on the upper side.

[0013] The advantages of the above technical solution are as follows: by setting a first positioning plate on the first front plate, the purpose of positioning the outer side plate is achieved; by setting an upper plate on the second front plate, the upper side of the first extension can be blocked; and by setting a second positioning plate on the upper plate, the purpose of positioning the upper side plate is achieved. Therefore, the use of the semi-arc extinguishing plate installed on the side plate will be more reliable. The setting of the third connecting inner plate makes the positioning and splicing of the two semi-arc extinguishing chambers more reliable, and at the same time, it will also block the upper end of the arc extinguishing chamber, making the structural design reasonable.

[0014] Furthermore, an inner arc-isolating plate and an outer arc-isolating plate are provided on the stationary contact at the rear position of the arc-extinguishing chamber. The inner arc-isolating plate and the outer arc-isolating plate are in contact with each other. The inner arc-isolating plate has multiple air holes through it. The outer arc-isolating plate also has cutting grooves formed on the mounting feet on both sides to make the outer arc-isolating plate elastic.

[0015] The advantages of the above technical solution are as follows: by setting the inner and outer arc-isolating plates that fit together, the small arc discharged from the rear of the arc-extinguishing chamber can be extinguished, making the use of the wiring screw safer. In addition, the setting of the air hole and the cutting groove allows the outer arc-isolating plate to bend when the arc-extinguishing chamber ejects gas, thereby opening the air hole and effectively realizing heat dissipation and exhaust. After exhaust is completed, the outer arc-isolating plate returns to its deformation and fits onto the inner arc-isolating plate again, thereby closing the air hole again.

[0016] Furthermore, the second insulating member includes a first stop, two second stops, and a third stop. The first stop is attached to the bottom of the contact end of the moving contact. The second stops are connected to the left and right sides of the first stop and are respectively attached to the left and right sides of the contact end of the moving contact. The third stop is connected to the rear side of the first stop. The contact support is provided with a through-cavity assembly cavity, which is used to mate with the moving contact. The third stop is attached to the lower front side of the assembly cavity.

[0017] The advantages of the above technical solution are as follows: the first baffle provides a certain degree of protection to the bottom of the contact end of the moving contact; the two second baffles provide a certain degree of protection to the left and right sides of the contact end of the moving contact; the third baffle prevents small electric arcs from entering the rear end of the rotating shaft through the gap between the moving contact and the assembly cavity; and the second insulating component has a reasonable structural design and good protective effect.

[0018] Furthermore, the moving contact engages with the assembly cavity and has a self-repelling function. A snap-fit ​​block is provided on the outer rear end of the second stop. The snap-fit ​​block is connected to the side wall of the assembly cavity. A support block is provided at a corresponding position in the assembly cavity. The support block corresponds to the snap-fit ​​block. The lower side of the snap-fit ​​block is a first inclined surface. The first inclined surface is inclined from bottom to top and outward. The upper side of the support block is a second inclined surface. The second inclined surface corresponds to the first inclined surface.

[0019] The advantages of the above technical solution are as follows: by setting the snap-fit ​​block and the support block, the connection between the second insulating component and the contact support can be made more reliable, preventing the second insulating component from falling off due to high temperature. When the repulsive force is large, the moving contact will rotate to achieve repulsion and self-holding. When the repulsive force decreases, the moving contact will rotate and reset. The setting of the first inclined surface and the second inclined surface avoids interference during the rotation and reset process of the moving contact. The structural design is reasonable.

[0020] Furthermore, the moving contact mechanism also includes a mounting shaft, an upper drive shaft, a lower drive shaft, and two elastic elements. The rear end of the assembly cavity is vertically continuous. The rear end of the assembly cavity also has two first mounting slots, two second mounting slots, and two third mounting slots. The first mounting slots are open at the lower end, and the mounting shaft passes through the moving contact and is limited at both ends to fit within the first mounting slot. The second mounting slots are open at the upper end, and the upper drive shaft is limited at both ends to fit within the second mounting slot. The third mounting slots are flared at the lower end. The two ends of the moving shaft are limited and matched with the third mounting groove. The two ends of the two elastic elements are respectively limited and matched with the upper drive shaft and the lower drive shaft. The rotating end of the moving contact is also provided with a driving protrusion. The driving protrusion abuts against the lower drive shaft. The bottom surface of the driving protrusion is set as a flat surface. The rotating surface of the driving protrusion is an arc surface and is provided with a first limiting groove at the corresponding position. The lower drive shaft forms a first limiting fit with the first limiting groove. The top of the rotating surface of the driving protrusion is also provided with a second limiting groove. The lower drive shaft forms a second limiting fit with the second limiting groove.

[0021] The advantages of the above technical solution are as follows: By setting a first mounting groove, a second mounting groove, and a third mounting groove in the assembly cavity, during installation, firstly, the two ends of the mounting shaft on the rotating end of the moving contact in the assembly cavity are inserted into the corresponding first mounting 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 mounting groove, and the two ends of the lower drive shaft are inserted into the corresponding third mounting 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 by simply 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 is effectively limited by the cooperation of the driving protrusion on the rotating end with the upper and lower drive shafts, and has a certain elastic holding force. The first and third mounting grooves are also designed to... The lower opening and the upper opening of the second mounting slot result in a more rational layout. The third mounting slot is also flared, which prevents jamming during the engagement of the lower drive shaft with the drive protrusion, ensuring smoother operation. The top of the drive protrusion is flat, allowing the rotating end of the moving contact to press more smoothly against the lower drive shaft, achieving a self-holding state and effectively preventing the moving contact from falling and reigniting its arc. Furthermore, the first limiting slot keeps the lower drive shaft locked in place at the moment of opening. The second limiting slot, when released from the first limiting slot, allows the moving contact to continue swinging, limiting its maximum swing angle and preventing excessive swing, thus ensuring safety and reliability.

[0022] Furthermore, the stationary contact is Z-shaped, with its middle end tilted backward. The middle end of the stationary contact is used to cooperate with the first insulating member. The rear end of the stationary contact is provided with a contact portion that is tilted forward and upward. The end of the contact portion is provided with an arc-inducing portion. One end of the first insulating member is inserted into the lower end of the arc-inducing portion.

[0023] The advantages of adopting the above technical solution are as follows: By setting the stationary contact to a Z-shaped structure and tilting the middle end of the stationary contact backward, the distance between the terminal and the contact end of the stationary contact is increased, which can effectively prevent the occurrence of electric arc hazards caused by electrical equipment being too close. By setting the contact part, a good conductive contact effect with the moving contact is achieved. By setting the arc-initiating part, a good arc-initiating effect is achieved. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial structural diagram of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the semi-extinguishing chamber structure of this utility model; Figure 4 This is a schematic diagram of the first cover structure of this utility model; Figure 5 This is a schematic diagram of the second cover structure of this utility model; Figure 6 This is a partial structural diagram of the present invention. Figure 2 ; Figure 7 This is a partial structural diagram of the present invention. Figure 3 ; Figure 8 This is a partial structural diagram of the present invention. Figure 4 ; Figure 9 This is a schematic diagram of the third insulating component of this utility model; Figure 10 This is a cross-sectional view of the rotating shaft structure of this utility model; Figure 11 This is a schematic diagram of the moving contact structure of this utility model; Figure 12 This is a schematic diagram of the stationary contact structure of this utility model. Figure 13 This is a schematic diagram of the mating structure of another stationary contact and riveting component of this utility model; Figure 14 This is a schematic diagram of the inner diaphragm structure of this utility model; Figure 15This is a schematic diagram of the external diaphragm structure of this utility model.

[0025] In the diagram: 1-Arc-extinguishing chamber, 2-Stationary contact, 3-First insulating component, 4-Rotating shaft, 5-Moving contact, 6-Second insulating component, 7-Contact support, 8-Side plate, 9-Half-arc-extinguishing plate, 10-First mating part, 11-First extension part, 12-First front plate, 13-Second front plate, 14-First inner plate, 15-Second inner plate, 16-Bottom plate, 17-First mating inner plate, 18-Second mating inner plate, 19-Positioning protrusion, 20-First positioning plate, 21-Upper plate, 22-Second positioning plate, 23-Third mating inner plate, 24- 25-Inner arc diaphragm, 26-Outer arc diaphragm, 27-Air hole, 28-Cutting groove, 29-First stop, 30-Second stop, 31-Third stop, 32-Assembly cavity, 33-Snap-fit ​​block, 34-Support block, 35-Mounting shaft, 36-Lower drive shaft, 37-Elastic element, 38-First mounting groove, 39-Second mounting groove, 40-Third mounting groove, 41-Drive protrusion, 42-First limiting groove, 43-Second limiting groove, 44-Contact part, 45-Arc-inducing part, 46-Silver contact, 47-Riveting part. Detailed Implementation

[0026] 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.

[0027] like Figures 1-15As shown, a conductive arc-extinguishing system for a molded case circuit breaker includes a stationary contact mechanism and a moving contact mechanism that cooperates with the stationary contact mechanism to achieve switching. The stationary contact mechanism includes an arc-extinguishing chamber 1, a stationary contact 2, and a first insulating member 3. The arc-extinguishing chamber 1 is located above the stationary contact 2 and is composed of two symmetrical half-arc-extinguishing chambers assembled together. The contact end of the stationary contact 2 extends into the arc-extinguishing chamber 1. The first insulating member 3 is located on the upper side of the stationary contact 2 and cooperates with the stationary contact 2 and the arc-extinguishing chamber 1. The first insulating member 3 can be Nomic paper. The moving contact mechanism includes a rotating shaft 4, a moving contact 5, and a second insulating member 6. A contact support 7 is provided on the rotating shaft 4. The moving contact 5 passes through the contact support 7 in the front-back direction. The front end of the moving contact 5 is the contact end. The front end of the arc-extinguishing chamber 1 cooperates with the moving contact 5, and the contact end of the moving contact 5 extends into the arc-extinguishing chamber 1 to cooperate with the arc-extinguishing system. The second insulating element 6 is located on the contact end of the stationary contact 2 and the contact end of the moving contact 5. The second insulating element 6 works in conjunction with the moving contact 5 and the arc-extinguishing chamber 1. In the above structure, by setting the first insulating element 3, the insulation effect between the arc-extinguishing chamber 1 and the stationary contact 2 is improved, effectively reducing the safety hazard of the stationary contact 2 being burned out. By setting the second insulating element 6, the insulation effect between the arc-extinguishing chamber 1 and the moving contact 5 is improved, effectively reducing the safety hazard of the moving contact 5 being burned out. This makes the use of the stationary contact 2 and the moving contact 5 safer. Moreover, the arc-extinguishing chamber 1 adopts a structure composed of two half arc-extinguishing chambers, realizing the purpose of modular disassembly and assembly, which facilitates the maintenance and replacement of single-sided components, and can effectively enhance maintainability and safety. Therefore, this conductive arc-extinguishing system can make the use of the molded case circuit breaker safer, longer in service life, and more reliable.

[0028] In this embodiment, each semi-extinguishing chamber includes a side plate 8 and multiple spaced semi-extinguishing plates 9. Each semi-extinguishing plate 9 has a first connecting part 10 in the middle and a first extension part 11 on the side. The first extension part 11 allows the semi-extinguishing plate 9 to be installed on the inner side of the side plate 8 at a certain angle. The first extension part 11 is provided with a pin, and the side plate 8 is provided with a socket. The installation of the semi-extinguishing plate 9 is achieved by the cooperation of the pin and the socket. In the above structure, during installation, the semi-extinguishing plate 9 is first installed on the side plate 8 through the first extension part 11 to form a semi-extinguishing chamber. Then, the two assembled semi-extinguishing chambers are assembled so that the first connecting part 10 on the semi-extinguishing plate 9 is connected, and the extinguishing chamber 1 can be assembled.

[0029] In this embodiment, the semi-extinguishing chamber also includes a first cover and a second cover. The first cover has a first front plate 12, and the second cover has a second front plate 13. The second front plate 13 is located above the first front plate 12. The side plate 8 is positioned and connected to the first front plate 12 and the second front plate 13. The first front plate 12 and the second front plate 13 are used to cover the front side of the first extension 11. That is, the first front plate 12 and the second front plate 13 can cover the front side of the first extension 11 and can also cooperate with the side plate 8 to form a position. The first front plate 12 is also integrally provided with a first inner plate 14, and the second front plate 13 is also integrally provided with a second inner plate 15. Plate 14 and the second inner plate 15 are used to shield the inner side of the first extension 11. In the above structure, by setting the first front plate 12 with the first inner plate 14 and the second front plate 13 with the second inner plate 15, after being connected and positioned with the side plate 8, shielding the front and inner sides of the first extension 11 can be formed. This can prevent molten metal particles generated by the breaking of the molded case circuit breaker from cooling and depositing in the gap between the first extension 11 and the moving contact 5. It also effectively reduces the safety hazard of the moving contact 5 being burned, making the use of the moving contact 5 safer. In addition, the separate structure of the first front plate 12 and the second front plate 13 reduces the molding difficulty.

[0030] In this embodiment, a base plate 16 is integrally provided below the first front plate 12, and the side plate 8 is also positioned and connected to the base plate 16. The base plate 16 can form a bottom positioning support for the side plate 8. A first docking inner plate 17 and a second docking inner plate 18 are also integrally provided on the base plate 16. The first docking inner plate 17 and the second docking inner plate 18 are arranged in a front-to-back manner relative to the contact end of the stationary contact 2. A positioning protrusion 19 is also integrally provided on the second docking inner plate 18. The positioning protrusion 19 is used to position the first insulating member 3. In the above structure, by providing the base plate 16 below the first front plate 12, the side plate 8 is positioned and connected to the base plate 16. The positioning connection of 8 is more reliable and the installation is simpler. It can also provide some shielding for the bottom of the first extension 11. At the same time, by setting the first docking inner plate 17 and the second docking inner plate 18, the positioning and splicing of the two half-arc-extinguishing chambers is more reliable. When the two half-arc-extinguishing chambers are assembled in place, a through-hole will be formed. The contact end of the stationary contact 2 can be inserted into the arc-extinguishing chamber 1 through the through-hole to achieve cooperation with the contact end of the moving contact 5. Furthermore, by setting the positioning protrusion 19, the first insulating component 3 is effectively fixed. The first insulating component 3 can form an installation socket, and the structural design is reasonable.

[0031] In this embodiment, a first positioning plate 20 is integrally provided on the first front plate 12. The first positioning plate 20 is used to position the outer side plate 8. The first inner plate 14 is arranged opposite to the first positioning plate 20. An upper plate 21 is integrally provided on the second front plate 13. The upper plate 21 is used to cover the upper side of the first extension 11. A second positioning plate 22 and a third docking inner plate 23 are also integrally provided on the upper plate 21. The second positioning plate 22 is used to position the upper side plate 8. In the above structure, by setting the first positioning plate 20 on the first front plate 12, the purpose of positioning the outer side plate 8 is achieved. By setting the upper plate 21 on the second front plate 13, the upper side of the first extension 11 can be covered. Furthermore, by setting the second positioning plate 22 on the upper plate 21, the purpose of positioning the upper side plate 8 is achieved. Therefore, the use of the semi-arc extinguishing plate 9 installed on the side plate 8 will be more reliable. The setting of the third docking inner plate 23 makes the positioning and splicing of the two semi-arc extinguishing chambers more reliable. At the same time, it will also cover the upper end of the arc extinguishing chamber 1, making the structural design reasonable.

[0032] In the above structure, after the two half-arc-extinguishing chambers are assembled, the first inner plate 14, the second inner plate 15, the first mating inner plate 17 and the third mating inner plate 23 will form a socket on the arc-extinguishing chamber 1, and the contact end of the moving contact 5 will extend into the arc-extinguishing chamber 1 through the socket.

[0033] In this embodiment, an inner arc-isolating plate 24 and an outer arc-isolating plate 25 are provided on the stationary contact 2 at the rear position of the arc-extinguishing chamber 1. The inner arc-isolating plate 24 and the outer arc-isolating plate 25 are attached to each other. Multiple air holes 26 are provided through the inner arc-isolating plate 24. Cutting grooves 27 are formed on the two mounting feet of the outer arc-isolating plate 25 to make the outer arc-isolating plate 25 elastic. In the above structure, by setting the attached inner arc-isolating plate 24 and the outer arc-isolating plate 25, the small arc discharged from the rear side of the arc-extinguishing chamber 1 can be extinguished, making the use of the wiring screw safer. In addition, the setting of air holes 26 and cutting grooves 27 allows the outer arc-isolating plate 25 to bend when the arc-extinguishing chamber 1 ejects gas, thereby opening the air holes 26 and effectively realizing heat dissipation and exhaust. After exhaust is completed, the outer arc-isolating plate 25 returns to its deformation and is attached to the inner arc-isolating plate 24 again, thereby closing the air holes 26 again.

[0034] In this embodiment, the second insulating member 6 includes a first stop 28, two second stops 29, and a third stop 30. The first stop 28 is attached to the bottom of the contact end of the moving contact 5. The second stops 29 are connected to the left and right sides of the first stop 28 and are respectively attached to the left and right sides of the contact end of the moving contact 5. The third stop 30 is connected to the rear side of the first stop 28. The contact support 7 is provided with a through-cavity 31, which is used to mate with the moving contact 5. The third stop 30 is attached to the lower front side of the assembly cavity 31. In the above structure, the first stop 28 can provide a certain degree of protection to the bottom of the contact end of the moving contact 5. The two second stops 29 can provide a certain degree of protection to the left and right sides of the contact end of the moving contact 5. The third stop 30 can prevent small electric arcs from entering the rear end of the rotating shaft 4 through the gap between the moving contact 5 and the assembly cavity 31. The structure of the second insulating member 6 is reasonably designed and has a good protective effect.

[0035] In this embodiment, the two second stops 29 will form through holes, and corresponding mounting protrusions will be provided on the left and right sides of the contact end of the moving contact 5. Through the cooperation of the mounting protrusions and the mounting holes, the installation of the second insulating component 6 is more stable.

[0036] In this embodiment, the moving contact 5 cooperates with the assembly cavity 31 and has a self-holding function. A locking block 32 is provided on the outer rear end of the second stop 29. The locking block 32 is connected to the side wall of the assembly cavity 31. A support block 33 is provided at a corresponding position in the assembly cavity 31. The support block 33 corresponds to the locking block 32, and the lower side of the locking block 32 is a first inclined surface, which is inclined outward from bottom to top. The upper side of the support block 33 is a second inclined surface, which corresponds to the first inclined surface. In the above structure, by providing the locking block 32... The support block 33 makes the connection between the second insulating element 6 and the contact support 7 more reliable, preventing the second insulating element 6 from falling off due to high temperature. When the repulsive force is large, the moving contact 5 will rotate to achieve repulsion and self-holding. When the repulsive force decreases, the moving contact 5 will rotate and reset. The setting of the first and second inclined surfaces avoids interference during the rotation and reset process of the moving contact 5. The structural design is reasonable. It should be noted that in the normal state, the first inclined surface on the snap-fit ​​block 32 and the second inclined surface on the support block 33 are in contact with each other.

[0037] In this embodiment, the moving contact mechanism further includes a mounting shaft 34, an upper drive shaft 35, a lower drive shaft 36, and two elastic members 37. The rear end of the assembly cavity 31 is vertically continuous. The rear end of the assembly cavity 31 is also provided with two first mounting grooves 38, two second mounting grooves 39, and two third mounting grooves 40. The first mounting grooves 38 are open at the lower end, and the mounting shaft 34 passes through the moving contact 5 and is limited at both ends to fit the first mounting grooves 38. The second mounting grooves 39 are open at the upper end, and the upper drive shaft 35 is limited at both ends to fit the second mounting grooves 39. The third mounting grooves 40 are flared at the lower end, and the lower drive shaft 36 is limited at both ends to fit the third mounting grooves 40. The two ends of the two elastic members 37 are respectively connected to the upper drive shaft 35 and the lower drive shaft 36. The upper limit is 6. The rotating end of the moving contact 5 is also provided with a driving protrusion 41. The driving protrusion 41 abuts against the lower driving shaft 36, and the bottom surface of the driving protrusion 41 is a flat surface. The rotating surface of the driving protrusion 41 is an arc surface and a first limiting groove 42 is provided at the corresponding position. The lower driving shaft 36 forms a first limiting engagement with the first limiting groove 42. The top of the rotating surface of the driving protrusion 41 is also provided with a second limiting groove 43. The lower driving shaft 36 forms a second limiting engagement with the second limiting groove 43. In the above structure, by providing a first mounting groove 38, a second mounting groove 39 and a third mounting groove 40 in the assembly cavity 31, during installation, first insert the two ends of the mounting shaft 34 on the rotating end of the moving contact 5 in the assembly cavity 31 into the corresponding first mounting groove 38, and then insert the two springs. The top of the elastic element 37 is hung on the upper drive shaft 35 limit, and then both ends of the upper drive shaft 35 are inserted into the corresponding second mounting slot 39. Then, both ends of the lower drive shaft 36 are inserted into the corresponding third mounting slot 40. Finally, the bottom of the elastic element 37 is hung on the upper limit of the lower drive shaft 36 using hooks or other tools. When disassembly is required, the elastic element 37 can be replaced by simply using hooks or other tools to release the limit between the elastic element 37 and the upper drive shaft 35 or the lower drive shaft 36. After the above structure is installed in place, the moving contact 5 is effectively limited by the cooperation of the drive protrusion 41 on the rotating end with the upper drive shaft 35 and the lower drive shaft 36, and has a certain elastic holding force. The first mounting slot 38 and the third mounting slot 40 are also set to be open at the bottom. Furthermore, the second mounting slot 39 is designed with an open top, resulting in a more rational layout. The third mounting slot 40 is also designed in a flared shape. This design prevents the lower drive shaft 36 from jamming during its engagement with the drive protrusion 41, ensuring smoother operation. The top of the drive protrusion 41 is also designed as a flat surface, allowing the rotating end of the moving contact 5 to press more smoothly against the lower drive shaft 36 via the drive protrusion 41, thus achieving a self-holding state and effectively preventing the moving contact 5 from falling and reigniting its arc. Additionally, the lower drive shaft 36 is secured within the first limiting slot 42, and the second limiting slot 43 releases the constraint between the lower drive shaft 36 and the first limiting slot 42, allowing the moving contact 5 to continue swinging.The second limiting groove 43 can limit the maximum swing angle of the moving contact 5, thereby preventing excessive swing of the moving contact 5 and ensuring safety and reliability in use.

[0038] In this embodiment, the stationary contact 2 is Z-shaped, with its middle end tilted backward. The middle end of the stationary contact 2 is used to cooperate with the first insulating member 3, which rests against the middle end of the stationary contact 2. The rear end of the stationary contact 2 is provided with a forward and upward tilting contact portion 44, and the end of the contact portion 44 is provided with an arc-inducing portion 45. One end of the first insulating member 3 is inserted into the lower end of the arc-inducing portion 45. In the above structure, the stationary contact 2 is set in a Z-shape, and the middle end of the stationary contact 2 is tilted backward, which increases the distance between the terminal and the contact end of the stationary contact 2. This can effectively prevent the electrical equipment from generating an electric arc due to being too close. By setting the contact portion 44, a good conductive contact effect with the moving contact 5 is achieved. By setting the arc-inducing portion 45, a good arc-inducing effect is achieved.

[0039] In this embodiment, a silver contact 46 may also be provided on the contact portion 44. By providing the silver contact 46, the circuit connection and disconnection can be made more reliable.

[0040] In another embodiment, the arc-starting part 45 is also provided with a riveting part 47, which is made of pure iron. Pure iron has a higher melting point than copper and has better resistance to burning, thus making the arc-starting effect better.

[0041] 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 conductive arc-extinguishing system for a molded case circuit breaker, comprising a stationary contact mechanism and a moving contact mechanism that cooperates with the stationary contact mechanism to achieve switching, characterized in that: The stationary contact mechanism includes an arc-extinguishing chamber (1), a stationary contact (2), and a first insulating member (3). The arc-extinguishing chamber (1) is located above the stationary contact (2) and is composed of two symmetrical half-arc-extinguishing chambers assembled together. The contact end of the stationary contact (2) extends into the arc-extinguishing chamber (1). The first insulating member (3) is positioned above the stationary contact (2) and cooperates with the stationary contact (2) and the arc-extinguishing chamber (1). The moving contact mechanism... The device includes a rotating shaft (4), a moving contact (5), and a second insulating member (6). The rotating shaft (4) is provided with a contact support (7). The moving contact (5) passes through the contact support (7) in the front-back direction. The contact end of the moving contact (5) extends into the arc-extinguishing chamber (1) to cooperate with the contact end of the stationary contact (2). The second insulating member (6) is provided on the contact end of the moving contact (5). The second insulating member (6) cooperates with the moving contact (5) and the arc-extinguishing chamber (1).

2. The conductive arc extinguishing system for a molded case circuit breaker according to claim 1, characterized in that: Each of the semi-extinguishing chambers includes a side plate (8) and multiple spaced semi-extinguishing plates (9). Each semi-extinguishing plate (9) is provided with a first connecting part (10) in the middle and a first extension part (11) on the side. The first extension part (11) causes the semi-extinguishing plate (9) to be installed on the inner side of the side plate (8) at a certain angle.

3. The conductive arc extinguishing system for a molded case circuit breaker according to claim 2, characterized in that: The semi-extinguishing chambers also include a first cover and a second cover. The first cover is provided with a first front plate (12), and the second cover is provided with a second front plate (13). The second front plate (13) is located above the first front plate (12). The side plate (8) is positioned and connected with the first front plate (12) and the second front plate (13). The first front plate (12) and the second front plate (13) are used to cover the front side of the first extension (11). The first front plate (12) is also integrally provided with a first inner plate (14), and the second front plate (13) is also integrally provided with a second inner plate (15). The first inner plate (14) and the second inner plate (15) are used to cover the inner side of the first extension (11).

4. The conductive arc extinguishing system for a molded case circuit breaker according to claim 3, characterized in that: A base plate (16) is integrally provided below the first front plate (12). The side plate (8) is also positioned and connected with the base plate (16). The base plate (16) is also integrally provided with a first docking inner plate (17) and a second docking inner plate (18). The first docking inner plate (17) and the second docking inner plate (18) are arranged in a front-to-back manner relative to the contact end of the stationary contact (2). The second docking inner plate (18) is also integrally provided with a positioning protrusion (19). The positioning protrusion (19) is used to position the first insulating member (3).

5. The conductive arc extinguishing system for a molded case circuit breaker according to claim 3, characterized in that: The first front plate (12) is integrally provided with a first positioning plate (20), which is used to position the side plate (8) on the outside. The second front plate (13) is integrally provided with an upper plate (21), which is used to cover the upper side of the first extension (11). The upper plate (21) is also integrally provided with a second positioning plate (22) and a third docking inner plate (23), which is used to position the side plate (8) on the upper side.

6. The conductive arc extinguishing system for a molded case circuit breaker according to claim 1, characterized in that: The stationary contact (2) is provided with an inner arc septum (24) and an outer arc septum (25) at the rear position of the arc extinguishing chamber (1). The inner arc septum (24) and the outer arc septum (25) are attached to each other. The inner arc septum (24) is provided with a plurality of air holes (26) at intervals. The outer arc septum (25) is provided with cutting grooves (27) on the mounting feet on both sides to make the outer arc septum (25) elastic.

7. The conductive arc extinguishing system for a molded case circuit breaker according to claim 1, characterized in that: The second insulating member (6) includes a first stop (28), two second stops (29), and a third stop (30). The first stop (28) is attached to the bottom of the contact end of the moving contact (5). The second stops (29) are connected to the left and right sides of the first stop (28). The second stops (29) are respectively attached to the left and right sides of the contact end of the moving contact (5). The third stop (30) is connected to the rear side of the first stop (28). The contact support (7) is provided with a front-to-back through assembly cavity (31). The assembly cavity (31) is used to cooperate with the moving contact (5). The third stop (30) is attached to the lower front side of the assembly cavity (31).

8. The conductive arc extinguishing system for a molded case circuit breaker according to claim 7, characterized in that: The moving contact (5) cooperates with the assembly cavity (31) and has a self-holding function. The outer rear end of the second stop (29) is provided with a snap-fit ​​block (32). The snap-fit ​​block (32) is connected to the side wall of the assembly cavity (31). The assembly cavity (31) is provided with a support block (33) at the corresponding position. The support block (33) corresponds to the snap-fit ​​block (32). The lower side of the snap-fit ​​block (32) is set as a first inclined surface. The first inclined surface is inclined from bottom to top and outward. The upper side of the support block (33) is set as a second inclined surface. The second inclined surface corresponds to the first inclined surface.

9. The conductive arc extinguishing system for a molded case circuit breaker according to claim 8, characterized in that: The moving contact mechanism also includes a mounting shaft (34), an upper drive shaft (35), a lower drive shaft (36), and two elastic elements (37). The rear end of the assembly cavity (31) is vertically through. The rear end of the assembly cavity (31) is also provided with two first mounting slots (38), two second mounting slots (39), and two third mounting slots (40). The first mounting slot (38) is open at the lower end. The mounting shaft (34) passes through the moving contact (5) and is limited at both ends to fit the first mounting slot (38). The second mounting slot (39) is open at the upper end. The upper drive shaft (35) is limited at both ends to fit the second mounting slot (39). The third mounting slot (40) is flared at the lower end. The lower drive shaft (36) is open at the lower end. The two ends of the elastic members (37) are respectively limited by the upper drive shaft (35) and the lower drive shaft (36). The rotating end of the moving contact (5) is also provided with a driving protrusion (41). The driving protrusion (41) abuts against the lower drive shaft (36). The bottom surface of the driving protrusion (41) is a flat surface. The rotating surface of the driving protrusion (41) is an arc surface and a first limiting groove (42) is provided at the corresponding position. The lower drive shaft (36) and the first limiting groove (42) form a first limiting fit. The top of the rotating surface of the driving protrusion (41) is also provided with a second limiting groove (43). The lower drive shaft (36) and the second limiting groove (43) form a second limiting fit.

10. The conductive arc extinguishing system for a molded case circuit breaker according to claim 1, characterized in that: The stationary contact (2) is arranged in a Z-shape. The middle end of the stationary contact (2) is inclined backward. The middle end of the stationary contact (2) is used to cooperate with the first insulating member (3). The rear end of the stationary contact (2) is provided with a contact portion (44) that is inclined forward and upward. The end of the contact portion (44) is provided with an arc-leading portion (45). One end of the first insulating member (3) is inserted into the lower end of the arc-leading portion (45).

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