Circuit breaker and ring main unit

Abstract

The utility model provides a circuit breaker and a ring main unit, the circuit breaker comprises a pole body, a moving end shielding seat, a moving conductive rod, a transmission crank arm, an insulation pull rod and a crank arm shaft, the moving end of the pole body is provided with the moving end shielding seat, two convex columns are formed on the moving end shielding seat, and the two convex columns are respectively provided with a first connecting hole; one end of the movable conducting rod passes through the bottom of the movable end shielding seat and extends into the vacuum arc-extinguishing chamber of the pole body; the transmission crank arm comprises a middle part, a first end and a second end, the first end and the second end are located at the two ends of the middle part, the first end of the transmission crank arm is in transmission connection with the other end of the movable conducting rod, and the insulation pull rod is connected with the second end of the transmission crank arm; the parts, extending to the outer side of the transmission crank arm, of the two axial ends of the crank arm shaft are inserted into the two first connecting holes of the movable end shielding base through the connecting pieces to be locked, so that the situation that the consistency of the pole body is damaged due to the fact that holes are formed in the pole body can be avoided, and the insulation performance and reliability of the circuit breaker are improved.

Description

Technical Field

[0001] The utility model relates to the field of switch cabinets, and mainly to a circuit breaker and a ring network cabinet. Background Art

[0002] In switch cabinets, SF6 gas insulation is usually used for electrical insulation of switchgear due to its good insulation and arc extinguishing properties. For example, SF6 gas is filled in the gas box of the switch cabinet. However, as a greenhouse gas, the use of SF6 is not conducive to environmental development. In the prior art, in order to produce and prepare more economical and environmentally friendly switch cabinets, dry air can be used directly as an insulating gas. However, the insulation performance of air is lower than that of SF6 gas. Therefore, the existing switch cabinets are restricted by the insulation performance of air and are usually large in size, resulting in large air-insulated ring network cabinets and high construction costs. In the actual application of switch cabinets, due to limited installation space, large-volume air-insulated ring network cabinets may not be promoted for use, and reducing the volume of the ring network cabinet will cause the ring network cabinet to fail to meet the insulation performance requirements. Utility Model Content

[0003] In order to solve the problem that the switch equipment of a small-sized medium and high voltage switch cabinet designed using air as the insulating gas in the current related technology does not meet the insulation requirements, a circuit breaker and a ring network cabinet are provided.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] One aspect of the present application discloses a circuit breaker, comprising:

[0006] A pole body, wherein a movable end shielding seat is provided at the movable end of the pole body, an opening is provided at the bottom of the movable end shielding seat, two convex columns are formed on the movable end shielding seat, and first connecting holes are respectively provided on the two convex columns, and the first connecting holes are located in a cavity surrounded by the movable end shielding seat;

[0007] A movable conductive rod, one end of which passes through the opening and extends into the vacuum interrupter of the pole body, and the movable conductive rod can move up and down in the opening;

[0008] A transmission crank arm, the transmission crank arm comprising a middle portion and a first end and a second end located at two ends of the middle portion, the first end of the transmission crank arm being transmission-connected to the other end of the moving conductive rod to drive the moving conductive rod to move;

[0009] an insulating pull rod connected to the second end of the transmission crank arm; and

[0010] The crank arm shaft is passed through the middle part of the transmission crank arm, and the axial ends of the crank arm shaft extend to the outside of the transmission crank arm and are inserted into the two first connecting holes of the movable end shielding seat through connecting pieces for locking.

[0011] Optionally, the moving end shielding seat includes a connecting plate and three shielding plates extending upward from the connecting plate, the connecting plate is located on the moving end of the pole body, the connecting plate is provided with the opening, the connecting plate and the shielding plate are combined to form the cavity, one of the shielding plates is connected to one side of the other two shielding plates, an opening is formed between the other sides of the two shielding plates, and the transmission crank arm extends into the cavity through the opening and is transmission-connected to the moving conductive rod.

[0012] Optionally, the two bosses are located in the cavity, and second connecting holes are respectively provided at both axial ends of the crank arm shaft, and the first connecting hole and the second connecting hole are correspondingly arranged so that a connecting member can be inserted from above into the second connecting hole and the first connecting hole to lock the crank arm shaft and the bosses.

[0013] Optionally, it also includes a first transmission pin and a connecting cover plate, the first transmission pin passes through the first end of the transmission crank arm, the other end of the moving conductive rod is provided with a first groove with an opening facing upward, the first transmission pin is installed in the moving conductive rod through the first groove, and the connecting cover plate is covered above the first groove and connected to the moving conductive rod so that the first transmission pin is limited to the first groove.

[0014] Optionally, the dynamic conductive rod is provided with two third connecting holes located on the outer side of the first groove, the openings of the third connecting holes are arranged upward, and the two third connecting holes are relatively arranged on both sides of the first groove, and fourth connecting holes corresponding to the third connecting holes are respectively penetrated at both ends of the connecting cover plate, so that the connecting piece can pass through the fourth connecting hole and the third connecting hole to lock the connecting cover plate and the dynamic conductive rod.

[0015] Optionally, the first end of the transmission crank arm is provided with a second groove, the first end of the transmission crank arm has a first side arm and a second side arm arranged opposite to each other, the second groove is formed between the first side arm and the second side arm, and the other end of the dynamic conductive rod and the connecting cover plate are both embedded in the second groove.

[0016] Optionally, corresponding fifth connecting holes are respectively provided on the first side arm and the second side arm, and the fifth connecting holes are used for the first transmission pin to pass through, and the first transmission pin is at least partially located in the second groove.

[0017] Optionally, it also includes a flexible connection, one end of which is connected to the moving end of the pole body through a fixing member, the other end of the flexible connection is used to connect the conductive circuit, and one end of the moving conductive rod passes through the part of the flexible connection and extends into the interior of the pole body.

[0018] Optionally, it further includes a second transmission pin, which passes through the second end of the transmission crooked arm, and one end of the insulating pull rod is connected to the transmission crooked arm through the second transmission pin.

[0019] Optionally, an input shaft, the other end of the insulating pull rod being connected to the input shaft; and

[0020] A circuit breaker operating mechanism is connected to the input shaft to drive the movable conductive rod of the pole body to move.

[0021] A second aspect of the present application discloses a ring main unit, comprising a cabinet and a circuit breaker as described above, which is arranged in the cabinet, wherein a pole body of the circuit breaker is fixed on the cabinet.

[0022] Beneficial effects:

[0023] The present application discloses a circuit breaker and a ring network cabinet, the circuit breaker includes a pole body, a moving end shielding seat, a moving conductive rod, a transmission crank arm, an insulating pull rod and a crank arm shaft. By providing a moving end shielding seat at the moving end of the pole body, the transmission connection structure of the moving conductive rod and the transmission crank arm is located in the cavity surrounded by the moving end shielding seat, thereby providing electrical isolation between the electrical connection of the moving end of the pole body and the external environment, and playing the role of uniform electric field. Further, a protruding column is provided on the moving end shielding seat, and a first connecting hole is provided on the protruding column. The first connecting hole can be passed through by a connecting member to fix the crank arm shaft on the moving end shielding seat. Compared with the method in the traditional technology that a process hole needs to be opened on the pole body for fixing the connecting pin of the transmission crank arm, the circuit breaker moving end transmission structure of the present application avoids opening a hole in the pole body to destroy the consistency of the pole body, and reduces the breakdown phenomenon that is easy to occur due to the position of the opening, thereby improving the insulation performance and reliability of the pole body, so that the circuit breaker can be applied to a miniaturized ring network cabinet to meet its high insulation performance requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A three-dimensional schematic diagram of a circuit breaker according to an embodiment of the present application;

[0025] Figure 2 for Figure 1 A local enlarged view of point A;

[0026] Figure 3 A cross-sectional view of a circuit breaker according to an embodiment of the present application;

[0027] Figure 4 for Figure 3 A local enlarged view of point B;

[0028] Figure 5 It is a three-dimensional schematic diagram of a moving end shielding seat according to an embodiment of the present application;

[0029] The corresponding relationship between the reference numerals and the component names is as follows:

[0030] 1 pole body, 101 vacuum interrupter;

[0031] 2 moving end shielding seat, 201 opening, 202 first connecting hole, 203 cavity, 204 opening, 21 convex column, 22 connecting plate, 23 shielding plate, 24 baffle plate;

[0032] 3 movable conductive rod, 301 first groove, 302 third connecting hole;

[0033] 4 transmission crank arm, 401 second groove, 41 middle portion, 42 first end, 411 first side arm, 412 second side arm, 43 second end;

[0034] 5. Insulation rod;

[0035] 6. Crank arm shaft;

[0036] 7 first transmission pin;

[0037] 8. Connect the cover plate;

[0038] 9 second transmission pin;

[0039] 10 Input shaft;

[0040] 11. Connecting parts;

[0041] 12 soft connections;

[0042] 13 fixings. DETAILED DESCRIPTION

[0043] The utility model provides a circuit breaker and a ring main unit. In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the protection scope of the utility model.

[0044] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "inside", "outside", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0046] In order to improve the reliability of power supply and enable users to obtain power from two directions, the power supply network is usually connected into a ring, that is, a ring network power supply system, and this power supply method is referred to as ring power supply. The high-voltage switchgear used in the ring network power supply system is generally called a ring network cabinet.

[0047] Traditional ring main units usually use SF6 gas insulation. SF6 gas has good insulation and arc extinguishing performance, but it is a strong greenhouse gas and is not conducive to environmental protection. Based on this, the existing ring main unit uses air insulation, which is more in line with the development concept of green environmental protection.

[0048] Those skilled in the art will understand that the smaller the volume of the ring main unit, the weaker the insulation performance. In particular, in the process of miniaturizing the ring main unit that uses dry air as the insulating gas, it is necessary to take into account the insulation performance of the cabinet while reducing the cabinet volume.

[0049] Therefore, for small-sized ring main units, especially medium and high voltage ring main unit designs, it is necessary to further improve the insulation performance inside the cabinet. Among them, since the circuit breaker pole is the key structure in the switch cabinet that carries the task of current transmission and distribution, if the insulation performance of the pole is poor, it may lead to excessive electric field strength, thereby causing partial discharge or breakdown. This application improves the insulation performance of the ring main unit by optimizing the electric field of the transmission connection structure design in the circuit breaker.

[0050] The present application discloses a ring main unit, in which a circuit breaker is arranged in a cabinet, and a pole body 1 of the circuit breaker is fixed on the cabinet.

[0051] As attached Figure 1 To Attachment Figure 5 As shown, the circuit breaker includes a pole body 1, a moving end shielding seat 2, a moving conductive rod 3, a transmission crank arm 4, an insulating pull rod 5 and a crank arm shaft 6.

[0052] like Figure 3 As shown, a vacuum interrupter 101 is provided in the pole body 1, and the pole body 1 has a moving end and a static end.

[0053] The moving end of the pole body 1 is equipped with a moving conductive rod 3, and the static end of the pole body 1 is equipped with a static conductive rod that is connected and disconnected with the moving conductive rod 3. A circuit breaker operating mechanism (not shown) for operating the circuit breaker is also provided in the ring main unit, and the circuit breaker operating mechanism can drive the moving conductive rod 3 to move, thereby realizing the on and off functions of the circuit breaker.

[0054] like Figure 1 and Figure 5 As shown, the movable end of the pole body 1 is provided with a movable end shielding seat 2, and the bottom of the movable end shielding seat 2 is provided with an opening 201. One end of the movable conductive rod 3 passes through the opening 201 and extends into the vacuum interrupter 101 of the pole body 1, and the movable conductive rod 3 can move up and down in the opening 201. In this way, the movable conductive rod 3 moves up and down in the opening 201 to engage with or disconnect from the static conductive rod located in the vacuum interrupter 101.

[0055] The other end of the moving conductive rod 3 is located in the cavity 203 of the moving end shielding seat 2, and the first end 42 of the transmission crank arm 4 is drivingly connected to the other end of the moving conductive rod 3 to drive the moving conductive rod 3 to move. By arranging the moving end shielding seat 2 on the moving end of the pole body 1, the cavity 203 surrounded by the moving end shielding seat 2 can cover the transmission structure connected between the moving conductive rod 3 and the transmission crank arm 4, and electrically isolate the connection between the moving conductive rod 3 and the transmission crank arm 4, thereby reducing the influence of the electric field on the electric field of the adjacent phase.

[0056] Furthermore, the other end of the movable conductive rod 3 is provided with a first groove 301 with an opening facing upward.

[0057] The first transmission pin 7 passes through the first end 42 of the transmission crank arm 4 and is installed in the movable conductive rod 3. The connecting cover plate 8 is covered above the first groove 301 and installed on the movable conductive rod 3. In this way, the first transmission pin 7 can be prevented from escaping from the first groove 301, so that the first transmission pin 7 is limited in the first groove 301.

[0058] As attached Figure 2 and attached Figure 4 As shown, the first transmission pin 7 passing through the transmission crank arm 4 is firstly embedded in the other end of the moving conductive rod 3 through the first groove 301, and then the connecting cover plate 8 is covered on the first groove 301 and installed on the other end of the moving conductive rod 3. The connecting cover plate 8 is arranged correspondingly to the other end of the moving conductive rod 3, so that the connecting cover plate 8 can cover the opening of the first groove 301, thereby limiting the first transmission pin 7 in the first groove 301. When the transmission crank arm 4 is driven by the circuit breaker operating mechanism to perform the opening and closing operation, the first end 42 of the transmission crank arm 4 transmits power to the moving conductive rod 3 through the first transmission pin 7, thereby driving the moving conductive rod 3 to move up and down along the opening 201.

[0059] like Figure 4 As shown, the dynamic conductive rod 3 is provided with two third connecting holes 302 located on the outer side of the first groove 301, the openings of the third connecting holes 302 are arranged upward, and the two third connecting holes 302 are relatively arranged on both sides of the first groove 301, and the two ends of the connecting cover plate 8 are respectively penetrated by fourth connecting holes corresponding to the third connecting holes 302, so that the connecting member 11 can pass through the fourth connecting hole and the third connecting hole 302 to lock the connecting cover plate 8 and the dynamic conductive rod 3.

[0060] Among them, by opening a fourth connection hole on the connection cover plate 8, a third connection hole 302 is correspondingly provided at the other end of the moving conductive rod 3, so that it is possible to avoid drilling a hole on the pole body 1 as a connection hole, avoid destroying the consistency of the pole body 1, reduce potential breakdown points, and reduce the easy occurrence of breakdown due to the position of the opening 201, which is beneficial to improving the overall insulation performance of the circuit breaker.

[0061] Specifically, after the connecting member 11 passes through the fourth connecting hole of the connecting cover plate 8 and the third connecting hole 302 of the moving conductive rod 3 in sequence, the connecting cover plate 8 and the moving conductive rod 3 are locked, so that the first end 42 of the transmission crank arm 4 is fixed to the moving conductive rod 3 through the first transmission pin 7. This connection method is simple, and the connecting cover plate 8 can cover the electrical connection between the moving conductive rod 3 and the transmission crank arm 4, which can reduce the exposed electrical connection part, so that the conductive connecting member 11 of the moving conductive rod 3 can reduce the problem of electric field concentration caused by the formation of a tip due to the transmission connection with the transmission crank arm 4, and improve the insulation performance of the transmission connection structure of the pole body 1.

[0062] like Figure 2 and Figure 3 As shown, the first end 42 of the transmission crank arm 4 is provided with a second groove 401, and the other end of the moving conductive rod 3 and the connecting cover plate 8 are both inserted into the second groove 401. In this way, the transmission connection structure between the moving conductive rod 3 and the transmission crank arm 4 can be made more compact and stable, and the exposure of the electrical connection part between the moving conductive rod 3 and the transmission crank arm 4 can be improved; at the same time, under the electrical isolation of the moving end shielding seat 2, the electric field distribution at the transmission connection between the moving conductive rod 3 and the transmission crank arm 4 can be effectively improved.

[0063] like Figure 3 As shown, one end of the flexible connection 12 is connected to the moving end of the pole body 1 through a fixing member 13 , and the other end of the flexible connection 12 is used to connect the conductive circuit. One end of the moving conductive rod 3 passes through the part of the flexible connection 12 and extends into the interior of the pole body 1 .

[0064] Specifically, the moving conductive rod 3 passes through one end of the soft connection 12 and extends into the vacuum arc extinguishing chamber 101 in the pole body 1. A fixing part 13 is connected to the moving conductive rod 3. The fixing part 13 fixes the soft connection 12 on the moving end of the pole body 1. The other end of the soft connection 12 extends upward through the opening at the top of the moving end shielding seat 2 and is connected to the conductive circuit.

[0065] like Figure 2 As shown, the transmission crank arm 4 includes a middle portion 41 and a first end 42 and a second end 43 located at both ends of the middle portion 41. The first end 42 of the transmission crank arm 4 is transmission-connected with the other end of the moving conductive rod 3 to drive the moving conductive rod 3 to move, the second end 43 of the transmission crank arm 4 is connected with the insulating pull rod 5, and the middle portion 41 of the transmission crank arm 4 is fixed on the moving end shielding seat 2 through the crank arm shaft 6 passing through it.

[0066] It can be understood that the middle part 41 of the transmission crank arm 4 constitutes the fulcrum of the lever, the second end 43 of the transmission crank arm 4 is connected to the insulating pull rod 5, and the second end 43 of the transmission crank arm 4 serves as the power input end. When the insulating pull rod 5 drives the transmission crank arm 4 to rotate around its middle part 41 under the drive of the circuit breaker operating mechanism, the force will be transmitted to the first end 42 through the transmission crank arm 4. The first end 42 of the transmission crank arm 4 serves as the power output end, which can drive the conductive rod 3 to move, thereby realizing the opening and breaking functions of the circuit breaker.

[0067] Specifically, an opening 204 is formed between the two shielding plates 23 in the moving end shielding seat 2, so that the transmission crank arm 4 can extend into the cavity 203 through the opening 204 and be connected to the moving conductive rod 3 for transmission, which is convenient for installation. In addition, the connection part between the transmission crank arm 4, the pole body 1 and the moving conductive rod 3 is located in the cavity 203, thereby reducing the mutual influence of the electric fields of adjacent phases in the circuit breaker and optimizing the electric field distribution.

[0068] As attached Figure 2 As shown, the first end 42 of the transmission crank arm 4 is provided with a second groove 401. Among them, the first end 42 of the transmission crank arm 4 has a first side arm 411 and a second side arm 412 arranged opposite to each other, the second groove 401 is formed between the first side arm 411 and the second side arm 412, and the other end of the moving conductive rod 3 and the connecting cover plate 8 are both inserted in the second groove 401. In this way, the other end of the moving conductive rod 3 and the connecting cover plate 8 are inserted in the second groove 401, and the first side arm 411, the second side arm 412 and the connecting cover plate 8 of the transmission crank arm 4 can wrap the other end of the moving conductive rod 3, reducing the exposed electrical connection part, and further optimizing the electric field distribution on the moving end side of the pole body 1.

[0069] The first side arm 411 and the second side arm 412 are respectively provided with corresponding fifth connecting holes, and the fifth connecting holes are used for the first transmission pin 7 to pass through. The first transmission pin 7 is at least partially located in the second groove 401 .

[0070] A crank arm shaft 6 is passed through the middle portion 41 of the transmission crank arm 4, and two bosses 21 are formed on the movable end shielding seat 2. The two bosses 21 are respectively provided with first connecting holes 202. The axial ends of the crank arm shaft 6 extending to the outside of the transmission crank arm 4 are inserted into the two first connecting holes 202 of the movable end shielding seat 2 through the connecting piece 11 and locked.

[0071] In this way, the transmission crank arm 4 is connected to the moving end shielding seat 2 through the crank arm shaft 6 and the connecting piece 11, instead of directly opening a through hole or a process hole on the pole body 1 for pin connection. This can avoid drilling holes on the pole body 1, thereby maintaining the consistency of the pole body 1, effectively reducing potential insulation breakdown points, and improving the insulation performance of the pole body 1.

[0072] On the other hand, since there is no need to open a through hole or a process hole on the pole body 1, the manufacturing process of the circuit breaker is simplified, and the assembly process of the circuit breaker is also simpler, which is conducive to improving the assembly efficiency.

[0073] Among them, the first connection hole 202 is located in the cavity 203 surrounded by the moving end shielding seat 2, so that the fixed connection point of the middle part 41 of the transmission crank arm 4 can be located in the cavity 203, and the moving end shielding seat 2 provides electrical isolation for the fixed connection end of the transmission crank arm 4 to improve the insulation level.

[0074] As attached Figure 1 and Figure 3 As shown, it also includes a second transmission pin 9, which passes through the second end 43 of the transmission crank arm 4. One end of the insulating pull rod 5 is connected to the transmission crank arm 4 through the second transmission pin 9, so that the second end 43 of the crank arm is fixedly connected to the insulating pull rod 5.

[0075] The other end of the insulating rod 5 is connected to the input shaft 10, and the circuit breaker operating mechanism is connected to the input shaft 10 to drive the moving conductive rod 3 of the pole body 1 to move. Specifically, the circuit breaker operating mechanism can drive the input shaft 10 to rotate, so that the insulating rod 5 connected to the input shaft 10 moves up and down. In this process, the second end 43 of the transmission crank arm 4 serves as a power input end and transmits force to the first end 42 of the transmission crank arm 4, thereby driving the first end 42 of the transmission crank arm 4 to drive the moving conductive rod 3 to move up and down, thereby realizing the connection and disconnection of the moving conductive rod 3 and the static conductive rod.

[0076] As attached Figure 1 and attached Figure 5 As shown, the moving end shielding seat 2 includes a connecting plate 22 and three shielding plates 23 extending upward from the connecting plate 22 . The connecting plate 22 and the three shielding plates 23 enclose a cavity 203 .

[0077] One of the shielding plates 23 is connected to one side of the other two shielding plates 23, and an opening 204 is formed between the other sides of the two shielding plates 23. The portion of the transmission crank arm 4 extending into the cavity 203 through the opening 204 is transmission-connected to the movable conductive rod 3. In this way, the connection between the conductive rod and the transmission crank arm 4 can be installed in the movable end shielding seat 2, and the movable end shielding seat 2 can electrically isolate the connection between the conductive rod and the transmission crank arm 4.

[0078] Specifically, the connecting plate 22 is located on the moving end of the pole body 1 and is provided with an opening 201. The moving conductive rod 3 can extend into the vacuum arc extinguishing chamber 101 of the pole body 1 through the opening 201 of the connecting plate 22, thereby connecting or disconnecting with the static conductive rod.

[0079] For example, the connecting plate 22 and the three shielding plates 23 jointly enclose the inner surface of the cavity 203 of the output end shielding seat 2. The inner surface can be configured as a metal surface. The metal surface has good electrical conductivity and electromagnetic shielding effect, which can further optimize the electric field distribution at the connection between the conductive rod and the transmission arm 4, thereby improving the electrical performance of the circuit breaker.

[0080] In one embodiment, if Figure 5 As shown, the two protrusions 21 are located at the openings 204 formed by the two shielding plates 23 .

[0081] In another embodiment, Figure 1 and Figure 2 As shown, a baffle 24 is further disposed at the opening 204 formed by the two shielding plates 23 , and the two protruding columns 21 are disposed adjacent to the baffle 24 and are located on the inner side of the baffle 24 .

[0082] Specifically, Figure 5 As shown, the two bosses 21 are located in the cavity 203, and second connecting holes are respectively provided at the axial ends of the crank arm shaft 6. The first connecting hole 202 is correspondingly arranged to allow the connecting member 11 to be inserted from above into the second connecting hole and the first connecting hole 202 to lock the crank arm shaft 6 and the boss 21.

[0083] In this way, the crank arm shaft 6 is fixedly connected to the boss 21 , and the middle portion 41 of the transmission crank arm 4 is provided with a through hole for the crank arm shaft 6 to pass through. Driven by the insulating pull rod 5 , the transmission crank arm 4 can rotate relative to the crank arm shaft 6 .

[0084] The first connecting hole 202 of the boss 21 is set upward, and through holes are provided at both axial ends of the crank arm shaft 6, so that the connecting piece 11 can lock the crank arm shaft 6 and the boss 21 by inserting the second connecting hole and the first connecting hole 202 from above. This connection method not only enhances the connection stability between the crank arm shaft 6 and the moving end shielding seat 2, but also simplifies the connection structure at the fixed fulcrum of the transmission crank arm 4, as well as the assembly process of the transmission crank arm 4.

[0085] In general, the circuit breaker disclosed in the present application is provided with a moving end shielding seat 2 at one end of the moving conductive rod 3, and the moving end shielding seat 2 can cover the connection structure between the moving conductive rod 3 of the pole body 1 and the transmission crank arm 4, so as to better electrically isolate the electrical connection of the pole body 1 from the external environment, and play a role in uniform electric field. Further, by providing a boss 21 on the moving end shielding seat 2, the first connection hole 202 provided on the boss 21 can be passed through by the connector 11 to fix the crank arm shaft 6 on the moving end shielding seat 2. Compared with the method in which a process hole needs to be opened on the pole body 1 for fixing the connecting pin of the transmission crank arm 4 in the traditional technology, the moving end transmission structure of the circuit breaker of the present application avoids opening a hole in the pole body 1 to destroy the consistency of the pole body 1, and reduces the breakdown phenomenon that is easy to occur due to the position of the hole, thereby improving the insulation performance and reliability of the pole body 1, so that the circuit breaker can be applied to a miniaturized ring network cabinet to meet its high insulation performance requirements.

[0086] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and the utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the utility model.

Claims

1. A circuit breaker, characterized in that: include: A pole body, wherein a movable end shielding seat is provided at the movable end of the pole body, an opening is provided at the bottom of the movable end shielding seat, two convex columns are formed on the movable end shielding seat, and first connecting holes are respectively provided on the two convex columns, and the first connecting holes are located in a cavity surrounded by the movable end shielding seat; A movable conductive rod, one end of which passes through the opening and extends into the vacuum interrupter of the pole body, and the movable conductive rod can move up and down in the opening; A transmission crank arm, the transmission crank arm comprising a middle portion and a first end and a second end located at two ends of the middle portion, the first end of the transmission crank arm being transmission-connected to the other end of the moving conductive rod to drive the moving conductive rod to move; An insulating pull rod connected to the second end of the transmission crank arm; as well as The crank arm shaft is passed through the middle part of the transmission crank arm, and the axial ends of the crank arm shaft extend to the outside of the transmission crank arm and are inserted into the two first connecting holes of the movable end shielding seat through connecting pieces for locking.

2. The circuit breaker according to claim 1, characterized in that: The moving end shielding seat includes a connecting plate and three shielding plates extending upward from the connecting plate, wherein the connecting plate is located on the moving end of the pole body, the connecting plate is provided with the opening, the connecting plate and the shielding plate are combined to form the cavity, one of the shielding plates is connected to one side of the other two shielding plates, an opening is formed between the other sides of the two shielding plates, and the transmission crank arm extends into the cavity through the opening and is transmission-connected to the moving conductive rod.

3. The circuit breaker according to claim 2, characterized in that: The two bosses are located in the cavity, and second connecting holes are respectively provided at the axial ends of the crank arm shaft. The first connecting hole and the second connecting hole are correspondingly arranged so that a connecting member can be inserted from above into the second connecting hole and the first connecting hole to lock the crank arm shaft and the bosses.

4. The circuit breaker according to any one of claims 1 to 3, characterized in that: It also includes a first transmission pin and a connecting cover plate, the first transmission pin passes through the first end of the transmission crank arm, the other end of the moving conductive rod is provided with a first groove opening upward, the first transmission pin is installed in the moving conductive rod through the first groove, and the connecting cover plate is covered above the first groove and connected to the moving conductive rod so that the first transmission pin is limited to the first groove.

5. The circuit breaker according to claim 4, characterized in that: The dynamic conductive rod is provided with two third connecting holes located on the outer side of the first groove, the openings of the third connecting holes are arranged upward, and the two third connecting holes are relatively arranged on both sides of the first groove, and fourth connecting holes corresponding to the third connecting holes are respectively penetrated at both ends of the connecting cover plate, so that the connecting piece can pass through the fourth connecting hole and the third connecting hole to lock the connecting cover plate and the dynamic conductive rod.

6. The circuit breaker according to claim 4, characterized in that: The first end of the transmission crank arm is provided with a second groove, the first end of the transmission crank arm has a first side arm and a second side arm arranged opposite to each other, the second groove is formed between the first side arm and the second side arm, and the other end of the dynamic conductive rod and the connecting cover plate are both inserted into the second groove; The first side arm and the second side arm are respectively provided with corresponding fifth connecting holes, and the fifth connecting holes are used for the first transmission pin to pass through, and the first transmission pin is at least partially located in the second groove.

7. The circuit breaker according to claim 4, characterized in that: It also includes a flexible connection, one end of which is connected to the moving end of the pole body through a fixing member, and the other end of the flexible connection is used to connect the conductive loop, and one end of the movable conductive rod passes through the part of the flexible connection and extends into the interior of the pole body.

8. The circuit breaker according to any one of claims 1 to 3, characterized in that: It also includes a second transmission pin, which passes through the second end of the transmission crank arm, and one end of the insulating pull rod is connected to the transmission crank arm through the second transmission pin.

9. The circuit breaker according to claim 8, characterized in that: An input shaft, the other end of the insulating pull rod being connected to the input shaft; and A circuit breaker operating mechanism is connected to the input shaft to drive the movable conductive rod of the pole body to move.

10. A ring main unit, characterized in that: The invention comprises a cabinet and a circuit breaker as claimed in any one of claims 1 to 9 arranged in the cabinet, wherein a pole body of the circuit breaker is fixed on the cabinet.

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