A long-life solid cabinet circuit breaker

Abstract

The present invention provides a long-life solid cabinet circuit breaker, belonging to the technical field of circuit breakers, comprising a circuit breaker mechanism, the circuit breaker mechanism comprising a vacuum arc extinguishing chamber, the vacuum arc extinguishing chamber comprising an outer shell and at least two vacuum switch assemblies, the vacuum switch assembly comprising a shielding shell, a fixed electrode and a movable electrode, the movable electrodes of each vacuum switch assembly move synchronously, the shielding shell has a vacuum cavity, the side wall of the shielding shell on the mating side is provided with at least one slot along the axial direction of the outer shell, the two corresponding slots on two adjacent shielding shells are matched to form a plug-in channel, and a plug-in rod is provided in the plug-in channel; the vacuum arc extinguishing chamber integrated with multiple vacuum switch assemblies in the present invention is used to help disperse the current load, thereby reducing the workload of each electrode and extending the service life of the electrode, and at the same time, a special plug-in structure is used between adjacent vacuum switch assemblies to achieve rapid disassembly and assembly, thereby reducing the complexity of maintenance and improving the efficiency of maintenance.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, and in particular to a long-life solid cabinet circuit breaker. Background Art

[0002] Solid state cabinet circuit breakers are a type of protection equipment widely used in power systems, mainly used to quickly cut off current to prevent damage to electrical equipment and failure of power systems. Compared with traditional gas-insulated or oil-immersed circuit breakers, solid state cabinet circuit breakers are favored for their compact structure, reliable operation, and low maintenance requirements, and are particularly suitable for modern distribution systems and compact switchgear.

[0003] The patent application of the applicant with publication number CN115763167B discloses a solid cabinet circuit breaker and a control method thereof, wherein a conventional vacuum arc extinguishing chamber is used, and the arc extinguishing chamber is usually composed of an insulating shell, a moving conductive rod, a static conductive rod, a moving contact and a static contact. Although this design performs well in many applications, during long-term use, the arc generated by the disconnection of the moving contact and the static contact will cause the electrode to melt and dissolve, thereby affecting the closing and conducting capabilities of the moving contact and the static contact. This electrode loss not only reduces the performance of the arc extinguishing chamber, but may also lead to a decrease in the reliability of the equipment and increase the frequency of maintenance and replacement. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a long-life solid cabinet circuit breaker.

[0005] The technical solution adopted by the present invention is as follows: The present application provides a long-life solid cabinet circuit breaker, including a transmission box, a circuit breaker mechanism and an isolating knife mechanism, one side of the transmission box is connected to a three-phase insulating pole, and the other side is connected to an isolating operating mechanism and a circuit breaker operating mechanism, each phase of the insulating pole includes an insulating shell, the circuit breaker mechanism includes a vacuum arc chamber arranged in each insulating shell, a circuit breaker transmission assembly and a circuit breaker linkage assembly arranged in the transmission box, the vacuum arc chamber includes an outer shell and at least two vacuum switch assemblies arranged in the outer shell, the vacuum switch assembly includes a shielding shell, a fixed electrode and a movable electrode, and the movable electrode of each vacuum switch assembly The moving electrodes move synchronously, the shielding shell has a vacuum cavity, the side wall of the shielding shell on the fitting side is provided with at least one slot along the axial direction of the shell, the two corresponding slots on the two adjacent shielding shells are matched to form a plug-in channel, a plug-in rod is provided in the plug-in channel, the plug-in rod includes a cross bar portion and a vertical bar portion which are vertically arranged, the vertical bar portion is inserted into the plug-in channel, and the two shielding shells constituting the plug-in channel are fixed in the radial direction of the shell, the cross bar portion is respectively provided with a first connecting hole corresponding to the two shielding shells, and the upper end surface of the shielding shell is provided with a second connecting hole corresponding to the first connecting hole, and the bolt passes through the first connecting hole and is threadedly connected with the second connecting hole.

[0006] In some embodiments, a connecting rod is also included, and the side wall of the shielding shell on the mating side is provided with two slots along the axial direction of the shell, and two plug-in channels are formed at the joints of the two shielding shells, and plug-in rods are provided in the two plug-in channels, and a third connecting hole is provided on the cross bar part along the axial direction of the vertical bar part, and fourth connecting holes are provided at both ends of the connecting rod corresponding to the two third connecting holes, and the bolts pass through the fourth connecting holes and are threadedly connected to the third connecting holes.

[0007] In some embodiments, a sinking groove matched with the cross bar portion is provided at the upper end portion of the plug-in channel, the cross bar portion is embedded in the sinking groove, the connecting rod is tightly attached to the upper end surfaces of the corresponding two shielding shells, and grabbing grooves are provided on both sides of the connecting rod.

[0008] In some embodiments, it also includes a moving seat, the fixed electrode includes a static conductive rod and a static contact, the moving electrode includes a dynamic conductive rod and a moving contact, one end of the dynamic conductive rod is connected to the moving contact, and the other end extends upward from the shielding shell, a dynamic end cover is arranged between the dynamic conductive rod and the shielding shell, one end of the static conductive rod is connected to the static contact, and the other end extends downward from the shielding shell, a static end cover is arranged between the static conductive rod and the shielding shell, the upper end of the moving seat is connected to the circuit breaker transmission assembly, each of the dynamic conductive rods is connected to the moving seat, when the moving seat moves upward, each group of moving contacts is disconnected from the static contacts, and when the moving seat moves downward, each group of moving contacts is connected to the static contacts.

[0009] In some embodiments, a connecting seat is also included, and the outer shell includes a middle shell, an upper cover body and a lower cover body. Each of the vacuum switch assemblies is arranged in the middle shell, and the upper cover body and the lower cover body are respectively detachably connected to the upper and lower ends of the middle shell, each of the moving conductive rods extends out of the upper cover body, and each of the static conductive rods extends out of the lower cover body and is connected to the connecting seat.

[0010] In some embodiments, a latch member, a lower spring and an upper spring are also included. The movable seat includes a lower disk body, a sleeve portion and an upper disk body. The end surface of the lower disk body is provided with a first through hole of the same number as the movable conductive rod, and the side wall of the lower disk body is provided with an oblong adjustment hole. The upper end of the movable conductive rod passes through the first through hole, and a second through hole is provided thereon corresponding to the adjustment hole. The latch member passes through the adjustment hole and the second through hole, and the latch member is tightly matched with the second through hole, and the movable conductive rod slides relative to the movable seat; a convex plate portion is provided on the portion of the movable conductive rod between the lower disk body and the upper cover body, and the lower spring is sleeved at this portion and abuts between the convex plate portion and the upper cover body; a positioning shaft is provided in the middle of the upper cover body, and the sleeve portion is sleeved on the positioning shaft, and a third through hole is coaxially provided on the end surface of the upper disk body corresponding to each first through hole, and an adjusting bolt is provided in the third through hole, and the upper spring abuts between the end of the adjusting bolt and the lower disk body.

[0011] In some embodiments, a connecting groove is provided in the middle of the upper cover body, the lower end of the positioning shaft is connected to the connecting groove, a locking nut is provided on the adjusting bolt, and the locking nut is located on the upper side of the upper plate body.

[0012] In some embodiments, the moving contact has a moving contact surface, the stationary contact has a stationary contact surface, the moving contact surface is provided with a mounting hole coaxially with the moving conductive rod, a guide column is coaxially provided in the mounting hole, and a guide hole is provided coaxially with the conductive column on the stationary contact surface.

[0013] In some embodiments, a guide tapered hole is arranged on the static contact surface coaxially with the guide hole.

[0014] In some embodiments, one end of the guide column facing the guide hole is configured as a dome, and a lubrication sleeve is provided at the end of the guide column.

[0015] The beneficial effects of the present invention are as follows: In the present invention, a plurality of vacuum switch assemblies are arranged in a housing, and the moving electrodes of each vacuum switch assembly move synchronously, which helps to disperse the current load, thereby reducing the workload of each electrode, extending the service life of the electrode, and solving the problem of electrode loss caused by melting and dissolving of moving contacts and static contacts during long-term use of traditional vacuum interrupters.

[0016] Secondly, multiple vacuum switch assemblies are set up to achieve redundancy. Even if one vacuum switch assembly fails, the other vacuum switch assembly can still effectively perform arc extinguishing and power off functions, ensuring the reliability of the equipment at critical moments.

[0017] In addition, adjacent vacuum switch assemblies are connected by a special plug-in structure to achieve quick disassembly and assembly. When one of the vacuum switch assemblies fails or its performance deteriorates, it needs to be replaced or repaired. Simply remove the bolts on the shielding shell adjacent to the shielding shell to be replaced, and then use the connecting rod to pull the entire vacuum switch assembly out of the middle shell, reducing the complexity of maintenance and improving maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0019] Figure 1 It is a schematic diagram of a long-life solid cabinet circuit breaker in the present invention;

[0020] Figure 2 An exploded view of the vacuum interrupter in the present invention;

[0021] Figure 3 Schematic diagram of the vacuum interrupter in the present invention;

[0022] Figure 4 It is a partial schematic diagram of the vacuum switch assembly in the present invention;

[0023] Figure 5 A partial schematic diagram of the vacuum interrupter in the present invention Figure 1 ;

[0024] Figure 6 for Figure 5 The enlarged view of point A in the middle;

[0025] Figure 7 for Figure 5 The enlarged view of point B in the middle;

[0026] Figure 8 is a cross-sectional view of the vacuum interrupter chamber of the present invention;

[0027] Fig. 9 is a schematic diagram of the mobile seat in the present invention;

[0028] Fig.10 A partial schematic diagram of the vacuum interrupter in the present invention Figure 2 ;

[0029] Fig.11 A partial schematic diagram of the vacuum interrupter in the present invention Figure 3 . DETAILED DESCRIPTION

[0030] The following description provides specific application scenarios and requirements of this specification, with the purpose of enabling those skilled in the art to make and use the contents of this specification. Various local modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but to the widest scope consistent with the claims.

[0031] In the description of the present application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "transverse", "radial", "length", "width", "thickness", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0032] Secondly, the terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components and should not be understood as limitations on the embodiments of the present application.

[0033] In addition, the terms "installed", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components.

[0034] For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] Regarding the drawings of the present application, it should be clearly understood that the drawings are for illustration and description purposes only and are not intended to limit the scope of the present specification. It should also be understood that the drawings are not drawn to scale.

[0036] Embodiment 1:

[0037] like Figures 1 to 11As shown, this embodiment provides a long-life solid cabinet circuit breaker, including a transmission box 1, a circuit breaker mechanism 2 and an isolating knife mechanism 3, one side of the transmission box 1 is connected to a three-phase insulating pole 4, and the other side is connected to an isolating operating mechanism 5 and a circuit breaker operating mechanism 6, and the side connected to the isolating operating mechanism 5 and the circuit breaker operating mechanism 6 is set as an operating panel, and the isolating operating mechanism 5 and the circuit breaker operating mechanism 6 can adopt the mechanisms commonly used in the field of circuit breaker cabinet technology.

[0038] The insulating pole 4 of each phase includes an insulating shell 40, which is cast in one piece. Each phase of the three-phase insulating pole 4 is installed independently to avoid insulation problems between phases, reduce the hidden dangers of arcing between phases, and make it easier to achieve large-scale production, facilitate assembly, repair and maintenance.

[0039] The circuit breaker mechanism 2 includes a vacuum arc chamber 20 arranged in each insulating shell 40, a circuit breaker transmission assembly 21 and a circuit breaker linkage assembly 22 arranged in the transmission box 1. The vacuum arc chamber 20 includes an outer shell 200 and at least two vacuum switch assemblies 7 arranged in the outer shell 200. The outer shell 200 is made of insulating material. The vacuum switch assembly 7 includes a shielding shell 70, a fixed electrode 71 and a movable electrode 72. Each vacuum switch assembly 7 has an independent shielding shell 70 to avoid interference, improve arc extinguishing performance and prevent arc from penetrating the outer shell 200.

[0040] A plurality of vacuum switch assemblies 7 are arranged in a housing 200, and the movable electrodes 72 of each vacuum switch assembly 7 move synchronously. Specifically, a movable seat 8 is arranged, and the movable seat 8 is linked to the circuit breaker transmission assembly 21. Each movable electrode 72 is uniformly connected to the movable seat 8 to achieve synchronous movement, which is equivalent to forming a parallel circuit, helping to disperse the current load, thereby reducing the workload of each electrode, extending the service life of the electrode, and solving the problem of electrode loss caused by melting and dissolving of the moving contact 721 and the static contact 711 during long-term use of the traditional vacuum interrupter 20.

[0041] Secondly, the multiple vacuum switch assemblies 7 can work together when a short circuit or overload occurs, thereby extinguishing the arc more quickly and effectively and reducing damage to the electrodes.

[0042] Secondly, by reducing electrode wear and improving arc extinguishing efficiency, the overall reliability of the equipment is enhanced. This means that the failure rate of the equipment is reduced in long-term use, and users do not need to frequently replace or repair equipment, thereby reducing operating costs.

[0043] Secondly, multiple vacuum switch assemblies 7 are provided to achieve redundancy. Even if one vacuum switch assembly 7 fails, another vacuum switch assembly 7 can still effectively perform arc extinguishing and power-off functions, ensuring the reliability of the equipment at critical moments.

[0044] In this embodiment, four vacuum switch assemblies 7 are taken as an example. If the number is too large, each vacuum switch assembly 7 will be small in size and the processing difficulty will increase. If the number is too small, the performance improvement will be limited.

[0045] The shell 200 includes a middle shell 2000, an upper cover body 2001 and a lower cover body 2002, and the upper cover body 2001 and the lower cover body 2002 are respectively detachably connected to the upper and lower ends of the middle shell 2000, and form a vacuum cavity in the shielding shell 70, wherein the detachable connection can be a snap connection or a bolt connection, etc., and needs to be coordinated with a corresponding sealing structure to ensure the formation of a vacuum cavity.

[0046] Regarding the circuit breaker transmission assembly 21, the circuit breaker linkage assembly 22, the isolating knife mechanism 3, etc., reference can be made to the patent with publication number CN115763167B previously applied by the applicant, which discloses a solid cabinet circuit breaker and its control method, or other corresponding mechanisms in the same technical field, wherein the circuit breaker transmission assembly 21 includes an insulating pull rod connected to the movable electrode 72 in the vacuum arc chamber 20, and the movable electrode 72 is driven by the insulating pull rod to move away from or close to the fixed electrode 71 to achieve connection or disconnection.

[0047] Since the vacuum switch assembly 7 is equivalent to a separate module, it is necessary to consider how to install and fix multiple vacuum switch assemblies 7 in the housing 200. Therefore, in this embodiment, a vacuum switch assembly 7 assembly structure is proposed. Specifically, the side wall of the mating side of the shielding shell 70 is provided with at least one slot 700 along the axial direction of the housing 200. The mating side is the end face where one shielding shell 70 is mated with another shielding shell 70. Preferably, two slots 700 are arranged at intervals, and the two corresponding slots 700 on the two shielding shells 70 are matched to form a plug-in channel 701. The plug-in channel 7 01 is provided with a plug-in rod 73, and the plug-in rod 73 includes a horizontal rod portion 730 and a vertical rod portion 731 which are arranged perpendicularly to each other, which is equivalent to a T-shape, wherein the shape of the slot 700 can be a T-shape, a dovetail groove shape, etc., and the vertical rod portion 731 is adapted thereto, so that when the vertical rod portion 731 is inserted into the plug-in channel 701, the two shielding shells 70 constituting the plug-in channel 701 are fixed in the radial direction of the shell 200, and the upper cover body 2001 and the lower cover body 2002 fix the vacuum switch assembly 7 in the axial direction of the shell 200, so that each vacuum switch assembly 7 is stably assembled in the shell 200.

[0048] Secondly, the cross bar portion 730 is respectively provided with a first connecting hole 7301 corresponding to the two shielding shells 70, and the upper end surface of the shielding shell 70 is provided with a second connecting hole 702 corresponding to the first connecting hole 7301. The bolt passes through the first connecting hole 7301 and is threadedly connected with the second connecting hole 702 to prevent the plug-in rod 73 from slipping in the plug-in channel 701.

[0049] Furthermore, it also includes a connecting rod 74, and two plug-in channels 701 are formed at the joint of the two shielding shells 70, and plug-in rods 73 are arranged in the two plug-in channels 701. The third connecting hole 7302 is arranged on the horizontal rod part 730 along the axial direction of the vertical rod part 731, and the two ends of the connecting rod 74 are provided with fourth connecting holes 740 corresponding to the two third connecting holes 7302. Bolts pass through the fourth connecting holes 740 and are threadedly connected with the third connecting holes 7302. After the connecting rod 74 is assembled, it ensures that the upper end surface of the corresponding shielding shell 70 is flush, and ensures the synchronization of the movement of each moving electrode 72. In addition, when one of the vacuum switch assemblies 7 fails or its performance deteriorates, it needs to be replaced or repaired. It only needs to remove the bolts on the shielding shell 70 adjacent to the shielding shell 70 to be replaced, and the entire vacuum switch assembly 7 can be pulled out of the middle shell 2000 through the connecting rod 74, which reduces the complexity of maintenance and improves the efficiency of maintenance.

[0050] A sinking groove 7010 matched with the cross bar portion 730 is provided at the upper end portion of the plug-in channel 701. The cross bar portion 730 is embedded in the sinking groove 7010, so that the cross bar portion 730 also plays a positioning role between adjacent shielding shells 70. The connecting rod 74 is tightly attached to the upper end surfaces of the corresponding two shielding shells 70. Grabbing grooves are provided on both sides of the connecting rod 74, which is convenient for manual disassembly and assembly, and is more conducive to cooperating with a robot to realize automated disassembly and assembly.

[0051] Specifically, the fixed electrode 71 includes a static conductive rod 710 and a static contact 711, the movable electrode 72 includes a dynamic conductive rod 720 and a dynamic contact 721, the dynamic contact 721 has a dynamic contact surface 7210, the static contact 711 has a static contact surface 7110, one end of the dynamic conductive rod 720 is connected to the dynamic contact 721, and the other end extends upward from the shielding shell 70, a dynamic end cover 75 is arranged between the dynamic conductive rod 720 and the shielding shell 70, one end of the static conductive rod 710 is connected to the static contact 711, and the other end extends downward from the shielding shell 70, a static end cover 76 is arranged between the static conductive rod 710 and the shielding shell 70, the dynamic end cover 75, the static end cover 76 and the middle shell 2000 form the vacuum cavity to prevent arc or current leakage, while improving arc extinguishing performance.

[0052] Secondly, the upper end of the movable seat 8 is connected to the circuit breaker transmission assembly 21, and each of the movable conductive rods 720 is connected to the movable seat 8. When the movable seat 8 moves upward, each group of movable contacts 721 is disconnected from the static contacts 711. When the movable seat 8 moves downward, each group of movable contacts 721 is connected to the static contacts 711.

[0053] Secondly, it also includes a connecting seat 9, each of the vacuum switch assemblies 7 is arranged in the middle shell 2000, each of the dynamic conductive rods 720 extends out of the upper cover body 2001, each of the static conductive rods 710 extends out of the lower cover body 2002, and is connected to the connecting seat 9, each static conductive rod 710 is fixed to the middle shell 2000 through a static end cover 76, and a threaded connection portion is provided at the lower end of the connecting seat 9, and a lower conductive rod is connected to the threaded connection portion, and the static contact 711 in the isolation knife mechanism 3 is arranged on the lower conductive rod.

[0054] Furthermore, it also includes a latch member 10, a lower spring 11 and an upper spring 12, both of which are compression springs, and the movable seat 8 includes a lower plate body 80, a sleeve portion 81 and an upper plate body 82, wherein the lower plate body 80 and the sleeve portion 81 are integrated, the upper plate body 82 is assembled on the upper part of the sleeve portion 81, and the upper plate body 82 moves with the movable seat 8, and the upper end of the sleeve portion 81 is provided with a threaded connection hole 810 connected to the insulating pull rod, and the end surface of the lower plate body 80 is provided with a first through hole 800 of the same number as the movable conductive rod 720, and the lower plate body 80 An oblong adjustment hole 801 is provided on the side wall, the upper end of the movable conductive rod 720 passes through the first through hole 800, and a second through hole 7200 is provided on it corresponding to the adjustment hole 801, the latch member 10 passes through the adjustment hole 801 and the second through hole 7200, the latch member 10 and the second through hole 7200 are tightly matched, and the movable conductive rod 720 slides relative to the movable seat 8; the movable conductive rod 720 is provided with a convex plate portion 7201 at a position between the lower plate body 80 and the upper cover body 2001, and the lower spring 11 is sleeved at this position and abuts against the convex plate portion 7201 and the upper cover 2001; a positioning shaft 2004 is arranged in the middle of the upper cover 2001, the sleeve portion 81 is sleeved on the positioning shaft 2004, and a third through hole 820 is coaxially arranged on the end surface of the upper plate body 82 corresponding to each first through hole 800, and an adjusting bolt 83 is arranged in the third through hole 820, the upper spring 12 abuts between the end of the adjusting bolt 83 and the lower plate body 80, and a middle spring 2005 is sleeved on the positioning shaft 2004, and the middle spring 2005 abuts between the lower plate body 80 and the upper cover 2001; due to each The static contacts 711 in the vacuum switch assembly 7 have different consumption levels, and the moving contacts 721 act synchronously. The vacuum switch assembly 7 with excessive contact consumption may fail to close. Therefore, through the above arrangement, when the moving seat 8 drives the multiple moving conductive rods 720 to move so that the moving contacts 721 and the static contacts 711 are closed, if one of the paths is not closed, the upper spring 12 is compressed by rotating the adjusting bolt 83, and the moving conductive rod 720 is moved downward relative to the moving seat 8, so that the moving contact surfaces 7210 of the moving contacts 721 are flush, so that the vacuum switch assemblies 7 can be closed at the same time. It should be understood that each vacuum switch assembly 7 can be equipped with a circuit connection detection device for detecting whether the moving contact 721 and the static contact 711 are closed and connected. Generally, only the moving conductive rod 720 or the static conductive rod 710 needs to be tested for current.

[0055] A first upper spring positioning portion 830 is provided at the end of the adjusting bolt 83, and a second upper spring positioning portion 7202 is provided at the upper end of the moving conductive rod 720 corresponding to the first upper spring positioning portion 830. The spring positioning portion is located at a positioning boss or positioning groove corresponding to the spring, thereby improving the stability of the spring in the mechanism, thereby improving the stability and reliability of the entire mechanism.

[0056] Secondly, a connecting groove 2003 is provided in the middle of the upper cover body 2001, and the lower end of the positioning shaft 2004 is connected to the connecting groove 2003 for easy assembly. A locking nut 84 is provided on the adjusting bolt 83, and the locking nut 84 is located on the upper side of the upper plate body 82. The adjusting bolt 83 can realize precise adjustment of the moving conductive rod 720, and the setting of the locking nut 84 ensures that the adjusted setting will not loosen due to operation or external vibration, thereby ensuring the reliability of operation.

[0057] Furthermore, the moving end cover 75 is provided with a guide cylinder 750 toward the moving contact 721. The design of the guide cylinder 750 provides a clear guide path for the moving conductive rod 720, ensuring that the moving contact 721 can stably and accurately cooperate with the static contact 711 during the movement, thereby reducing the relative motion error between the contacts and improving the reliability and stability of the electrical contact.

[0058] The guide cylinder 750 is provided with a bellows 751 , which can improve the insulation performance of the arc extinguishing chamber, prevent current leakage, and ensure the safety and reliability of the equipment.

[0059] Since the guidance only by the guide cylinder 750 is not stable enough, especially when the moving conductive rod 720 is long, the movement of the moving conductive rod 720 is prone to deviation. Specifically, a mounting hole 770 is coaxially arranged on the moving contact surface 7210 with the moving conductive rod 720, and a guide column 771 is coaxially arranged in the mounting hole 770. The guide column 771 is threaded or bonded to the mounting hole 770, and a guide hole 772 is coaxially arranged on the static contact surface 7110 with the conductive column. The inner diameter of the guide hole 772 is slightly larger than the outer diameter of the guide column 771, thereby ensuring good alignment between the moving conductive rod 720 and the static conductive column, thereby reducing the possibility of poor contact between the moving contact 721 and the static contact 711, and improving the stability and reliability of the electrical connection.

[0060] Secondly, a guide cone hole 773 is coaxially arranged on the static contact surface 7110 with the guide hole 772, and the guide cone hole 773 can ensure that the guide column 771 always maintains a good centering effect during the insertion process, reducing poor contact or wear caused by deviation; the end of the guide column 771 facing the guide hole 772 is set as a dome 774, so that the guide column 771 is easier to insert into the guide hole 772; the end of the guide column 771 is provided with a lubricating sleeve 775, and the lubricating sleeve 775 covers the surface of the dome 774. The lubricating sleeve 775 can be made of PTFE material, and the lubricating sleeve 775 is used to facilitate the guide column 771 to be inserted into the guide hole 772 faster, while reducing the friction between the guide column 771 and the guide hole 772. In summary, after reading this detailed disclosure, those skilled in the art can understand that the aforementioned detailed disclosure can be presented only in an exemplary manner and may not be restrictive. Although it is not explicitly stated here, those skilled in the art can understand that the requirements of this application include various reasonable changes, improvements and modifications to the embodiments. Such alterations, improvements and modifications are intended to be suggested by the present application, and are within the spirit and scope of the exemplary embodiments of the present application.

[0061] In addition, it should be understood that in the foregoing description of the embodiments of the present application, in order to help understand a feature and for the purpose of simplifying the present application, the present application combines various features in a single embodiment, drawing or its description. However, this does not mean that the combination of these features is necessary. When reading the present application, it is entirely possible for a person skilled in the art to mark out a part of the devices as a separate embodiment. In other words, the embodiments in the present application can also be understood as the integration of multiple secondary embodiments. This is also true when the content of each secondary embodiment is less than all the features of a single aforementioned disclosed embodiment.

[0062] Finally, it should be understood that the embodiments of the application disclosed herein are explanations of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of the present application. Therefore, the embodiments disclosed in the present application are merely examples and not limitations. Those skilled in the art can adopt alternative configurations according to the embodiments in the present application to implement the application in the present application. Therefore, the embodiments of the present application are not limited to the embodiments accurately described in the application.

Claims

1. A long-life solid cabinet circuit breaker, comprising a transmission box, a circuit breaker mechanism and an isolating knife mechanism, wherein one side of the transmission box is connected to a three-phase insulating pole, and the other side is connected to an isolating operating mechanism and a circuit breaker operating mechanism, each phase of the insulating pole comprises an insulating shell, and the circuit breaker mechanism comprises a vacuum interrupter arranged in each insulating shell, a circuit breaker transmission assembly and a circuit breaker linkage assembly arranged in the transmission box, characterized in that: It also includes a moving seat, the vacuum arc extinguishing chamber includes an outer shell and at least two vacuum switch assemblies arranged in the outer shell, the vacuum switch assembly includes a shielding shell, a fixed electrode and a moving electrode, the fixed electrode includes a static conductive rod and a static contact, the moving electrode includes a dynamic conductive rod and a moving contact, one end of the dynamic conductive rod is connected to the moving contact, and the other end extends upward from the shielding shell, a dynamic end cover is arranged between the dynamic conductive rod and the shielding shell, one end of the static conductive rod is connected to the static contact, and the other end extends downward from the shielding shell, a static end cover is arranged between the static conductive rod and the shielding shell, the upper end of the moving seat is connected to the circuit breaker transmission assembly, each of the dynamic conductive rods is connected to the moving seat, when the moving seat moves upward, each group of moving contacts and static contacts are disconnected, when the moving seat moves upward, each group of moving contacts and static contacts are disconnected, When the seat moves downward, each group of moving contacts is connected to the static contacts, and the moving electrodes of the vacuum switch assemblies move synchronously. The shielding shell has a vacuum cavity, and the side wall of the shielding shell on the fitting side is provided with at least one slot along the axial direction of the shell. The two corresponding slots on the two adjacent shielding shells are matched to form a plug-in channel, and a plug-in rod is provided in the plug-in channel. The plug-in rod includes a cross bar portion and a vertical bar portion which are vertically arranged. The vertical bar portion is inserted into the plug-in channel to fix the two shielding shells constituting the plug-in channel in the radial direction of the shell, and the cross bar portion is respectively provided with a first connecting hole corresponding to the two shielding shells, and the upper end surface of the shielding shell is provided with a second connecting hole corresponding to the first connecting hole, and the bolt passes through the first connecting hole and is threadedly connected with the second connecting hole.

2. A long-life solid cabinet circuit breaker according to claim 1, characterized in that: It also includes a connecting rod, and the side wall of the shielding shell on the mating side is provided with two slots along the axial direction of the shell, and two plug-in channels are formed at the joints of the two shielding shells. Plug-in rods are provided in the two plug-in channels, and a third connecting hole is provided on the cross bar part along the axial direction of the vertical bar part, and fourth connecting holes are provided at both ends of the connecting rod corresponding to the two third connecting holes, and bolts pass through the fourth connecting hole and are threadedly connected to the third connecting hole.

3. A long-life solid cabinet circuit breaker according to claim 2, characterized in that: A sinking groove matched with the crossbar is arranged at the upper end of the plug-in channel, the crossbar is embedded in the sinking groove, the connecting rod is closely attached to the upper end surfaces of the two corresponding shielding shells, and grabbing grooves are arranged on both sides of the connecting rod.

4. A long-life solid cabinet circuit breaker according to claim 1, characterized in that: It also includes a connecting seat, the outer shell includes a middle shell, an upper cover body and a lower cover body, each of the vacuum switch assemblies is arranged in the middle shell, the upper cover body and the lower cover body are respectively detachably connected to the upper and lower ends of the middle shell, each of the moving conductive rods extends out of the upper cover body, each of the static conductive rods extends out of the lower cover body, and is connected to the connecting seat.

5. A long-life solid cabinet circuit breaker according to claim 4, characterized in that: It also includes a latch, a lower spring and an upper spring, the movable seat includes a lower plate body, a sleeve and an upper plate body, the end surface of the lower plate body is provided with a first through hole equal in number to the movable conductive rod, the side wall of the lower plate body is provided with an oblong adjustment hole, the upper end of the movable conductive rod passes through the first through hole, and a second through hole is provided on it corresponding to the adjustment hole, the latch passes through the adjustment hole and the second through hole, the latch is tightly matched with the second through hole, and the movable conductive rod is slidably matched with respect to the movable seat; The movable conductive rod is provided with a convex disc portion at a position between the lower disc portion and the upper cover body, and the lower spring is sleeved at this position and abuts between the convex disc portion and the upper cover body; A positioning shaft is arranged in the middle of the upper cover body, the sleeve part is sleeved on the positioning shaft, a third through hole is coaxially arranged on the end surface of the upper disk body corresponding to each first through hole, an adjusting bolt is arranged in the third through hole, and the upper spring abuts between the end of the adjusting bolt and the lower disk body.

6. A long-life solid cabinet circuit breaker according to claim 5, characterized in that: A connecting groove is arranged in the middle of the upper cover body, the lower end of the positioning shaft is connected to the connecting groove, a locking nut is arranged on the adjusting bolt, and the locking nut is located on the upper side of the upper plate body.

7. A long-life solid cabinet circuit breaker according to claim 6, characterized in that: The moving contact has a moving contact surface, and the stationary contact has a stationary contact surface. A mounting hole is coaxially arranged on the moving contact surface with the moving conductive rod, a guide column is coaxially arranged in the mounting hole, and a guide hole is coaxially arranged on the stationary contact surface with the conductive column.

8. The long-life solid cabinet circuit breaker according to claim 7, characterized in that: The static contact surface is provided with a guide tapered hole coaxially with the guide hole.

9. A long-life solid cabinet circuit breaker according to claim 8, characterized in that: One end of the guide column facing the guide hole is arranged as a dome, and the end of the guide column is arranged with a lubrication sleeve.

Images