Arc extinguish chamber, circuit breaker and GIS

Abstract

The invention belongs to the field of high-voltage switches with arc extinguishing devices, and particularly provides an arc extinguishing chamber, a circuit breaker and a GIS (Gas Insulated Switchgear). According to the arc extinguish chamber, a shielding cover which covers a static arc contact and is located in a static main contact is assembled on a static support, the shielding cover can move back and forth along the static support, and a large nozzle is connected with a shielding cover linkage mechanism and an arc contact linkage mechanism so that the shielding cover and a moving arc contact can move in the same direction through linkage of the shielding cover linkage mechanism during closing. And the moving and static arc contacts and the moving arc contact move in opposite directions through the arc contact linkage mechanism. The circuit breaker comprises the arc extinguish chamber. The GIS comprises the circuit breaker. According to the invention, the shielding cover capable of moving back and forth is arranged outside the static arc contact, so that an electric field at a fracture can be improved, and a relatively far insulation distance is formed between the shielding cover and the movable main contact on the basis of meeting normal opening and closing of the movable main contact, so that the large-current short-circuit breaking capacity of the circuit breaker is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of high-voltage switches with arc-extinguishing devices, and particularly relates to an arc-extinguishing chamber, a circuit breaker and a GIS. BACKGROUND

[0002] The circuit breaker bears the core protection and control function in the GIS (gas insulated metal-enclosed switchgear), and the arc-extinguishing chamber, as the core component of the circuit breaker, is responsible for extinguishing the arc generated when breaking the current.

[0003] For example, the utility model patent with the authorization announcement number CN214378215U discloses a double-acting arc-extinguishing chamber transmission structure. The arc-extinguishing chamber corresponding to the structure includes a static end assembly, a dynamic end assembly and a double-acting linkage structure. The static end assembly includes a static support, a static arc contact, a static main contact and the like. The dynamic end assembly includes a dynamic main contact, a dynamic arc contact, a dynamic contact seat, a large nozzle, a large nozzle fixing seat and the like. The double-acting linkage structure includes a T-shaped guide rail and a connecting rod mechanism and the like. The dynamic contact seat can be connected with an insulating pull rod and moves under the driving of the insulating pull rod. The dynamic contact, the dynamic arc contact and the large nozzle fixing seat move with the dynamic contact seat and drive the static arc contact to move towards the dynamic arc contact through the connecting rod mechanism. This double-acting arc-extinguishing chamber can move reversely and oppositely, and can increase the absolute breaking speed.

[0004] With the continuous development of the power system, the capacity of the transformer substation, the load density of the city and industrial center, the continuous access of large-capacity generator units to the power grid and the strong interconnection between systems will inevitably highlight a new problem, i.e., the short-circuit current capacity and the short-circuit current direct current component of the power system at all levels of the power grid are continuously increasing, and the problem of exceeding the short-circuit current capacity and the short-circuit current direct current component has become a prominent factor restricting the growth of the load of the power grid and the development of the power grid.

[0005] Due to the continuous narrowing of the electrical distance between various plants and stations, the short-circuit current level of more and more 220kV transformer substations exceeds the breaking capacity of 50kA of the 252kV circuit breaker in the existing GIS switchgear technology, which threatens the safe operation of the power grid. Under this background, it is necessary to improve the short-circuit breaking capacity of the 252kV circuit breaker equipped in the GIS to ensure the stable operation of the power grid. SUMMARY

[0006] The purpose of the present application is to provide an arc-extinguishing chamber to solve the technical problem of insufficient short-circuit breaking capacity of the 252kV circuit breaker in the prior art. The purpose of the present application is also to provide a circuit breaker to solve the same problem. Meanwhile, the purpose of the present application is also to provide a GIS using the above-mentioned circuit breaker.

[0007] To achieve the above-mentioned purpose, the technical scheme of the arc-extinguishing chamber provided by the present application is as follows: An arc-extinguishing chamber comprises a static end assembly and a dynamic end assembly, the static end assembly comprises a static support and a static main contact fixed relative to the static support, a static arc contact is assembled on the static support and can move forward and backward, the dynamic end assembly comprises a dynamic support and a dynamic main contact which can move forward and backward relative to the dynamic support, a dynamic arc contact and a large nozzle are installed on the dynamic main contact, a shielding cover is assembled on the static support and covers the static arc contact outside and is located in the static main contact, the shielding cover can move forward and backward along the static support, the large nozzle is connected with a shielding cover linkage mechanism and an arc contact linkage mechanism, so that the shielding cover and the dynamic arc contact move in the same direction through the shielding cover linkage mechanism and the static arc contact and the dynamic arc contact move towards each other through the arc contact linkage mechanism when closing.

[0008] As a further improvement, the shielding cover linkage mechanism comprises an inner linkage rod fixed with the large nozzle and an outer linkage rod fixed with the shielding cover, a sliding block is fixed with the outer linkage rod, a connecting plate is hinged with the inner linkage rod, a radial sliding groove is formed on the sliding block, a first linkage pin is fixed with the connecting plate, a guide rail is fixed on the static support, a guide groove is arranged on the guide rail, the first linkage pin is inserted into the sliding groove and the guide groove at the same time and can move along the sliding groove and the guide groove, so that the shielding cover moves through the cooperation of the connecting plate, the sliding block, the first linkage pin and the guide rail.

[0009] As a further improvement, the inner linkage rod, the outer linkage rod and the connecting plate are each provided with two and are symmetrical about the axis of the arc-extinguishing chamber, a pair of sliding grooves symmetrical about the axis of the arc-extinguishing chamber are arranged on the sliding block, and a pair of guide grooves symmetrical about the axis of the arc-extinguishing chamber are arranged on the guide rail.

[0010] As a further improvement, the arc contact linkage mechanism comprises an operating rod fixed with the static arc contact, a yoke hinged on the static contact support and a second linkage pin fixed on the inner linkage rod, one end of the yoke is provided with a linkage opening and the other end is fixed with a third linkage pin, a radial long groove is formed on the operating rod, the third linkage pin is inserted into the long groove and can move along the long groove, when closing, the second linkage pin can enter the linkage opening to drive the yoke to rotate, and the rotating action of the yoke is converted into the straight action of the operating rod through the third linkage pin moving along the long groove.

[0011] As a further improvement, an insulating support cylinder located outside the static main contact is connected between the static end assembly and the dynamic end assembly.

[0012] As a further improvement, a static end gas outlet for discharging hot gas flow is arranged at the end of the static support away from the static main contact, a flow guide cover is connected to the static support, an annular first space is arranged between the flow guide cover and the static support, the first space is used for the hot gas flow to flow towards the static main contact, a static end shielding cylinder is further fixed on the static support and covers the flow guide cover outside, an annular second space is arranged between the static end shielding cylinder and the flow guide cover, the second space communicates with the first space, so that the hot gas flow discharged from the first space flows away from the static main contact.

[0013] As a further improvement, a moving end gas outlet for discharging heated air is provided at the end of the moving support away from the moving main contact. A moving end shielding cylinder is fixed on the moving support and covers the moving end gas outlet. An annular gap is provided between the moving end shielding cylinder and the moving support, and the heated airflow moves in the direction away from the moving main contact through this gap.

[0014] As a further improvement, the moving end gas outlet includes multiple exhaust ports circumferentially spaced on the moving support. A guide seat is fixed on the moving support, which is used to disperse and guide the hot gas flow inside the moving support to each exhaust port.

[0015] This invention is an improved invention, and its beneficial effects are as follows: The arc-extinguishing chamber provided by this invention is still a double-acting arc-extinguishing chamber. The moving arc contact and the stationary arc contact can move in opposite directions through the linkage mechanism of the arc contact, thereby increasing the relative speed between the moving and stationary arc contacts, realizing rapid opening and closing of the arc contacts, and improving the breaking capacity of the circuit breaker. Furthermore, the arc-extinguishing chamber provided by this invention also has a shielding cover outside the stationary arc contact. The shielding cover can improve the electric field at the break point, thereby improving the high-current short-circuit breaking capacity of the circuit breaker. Simultaneously, when the circuit breaker is closed, the shielding cover linkage mechanism can move the shielding cover in the same direction as the moving main contact. This serves two purposes: firstly, it avoids the moving main contact; secondly, it increases the breaking distance between the shielding cover and the moving main contact, effectively improving the insulation capacity between the breaks, and thus improving the high-current short-circuit breaking capacity of the circuit breaker.

[0016] To achieve the above objectives, the technical solution for the circuit breaker provided by this invention is as follows: A circuit breaker includes an operating mechanism and an arc-extinguishing chamber. The arc-extinguishing chamber includes a stationary end assembly and a moving end assembly. The stationary end assembly includes a stationary support and a stationary main contact fixed relative to the stationary support. A stationary arc contact that can move back and forth is mounted on the stationary support. The moving end assembly includes a moving support and a moving main contact that can move back and forth relative to the moving support. A moving arc contact and a large nozzle are mounted on the moving main contact. A shielding cover is mounted on the stationary support, covering the stationary arc contact and located inside the stationary main contact. The shielding cover can move back and forth along the stationary support. The large nozzle is connected to a shielding cover linkage mechanism and an arc contact linkage mechanism, so that when the circuit is closed, the shielding cover and the moving arc contact are moved in the same direction through the shielding cover linkage mechanism, and the stationary arc contact and the moving arc contact are moved in opposite directions through the arc contact linkage mechanism.

[0017] As a further improvement, the shielding cover linkage mechanism includes an inner linkage rod fixedly connected to the large nozzle and an outer linkage rod fixedly connected to the shielding cover. The outer linkage rod is fixedly connected to a slider, and the inner linkage rod is hinged to a connecting plate. The slider has a radially extending groove, the connecting plate is fixed with a first linkage pin, and a guide rail is fixed on the stationary support. The guide rail has a guide groove, and the first linkage pin is inserted into both the groove and the guide groove and can move along the groove and the guide groove, so that the shielding cover moves in coordination through the connecting plate, slider, first linkage pin, and guide rail.

[0018] As a further improvement, the inner linkage rod, the outer linkage rod, and the connecting plate are each provided in pairs and are symmetrical about the arc-extinguishing chamber axis. The slider is provided with a pair of sliding grooves symmetrical about the arc-extinguishing chamber axis, and the guide rail is provided with a pair of guide grooves symmetrical about the arc-extinguishing chamber axis.

[0019] As a further improvement, the arc contact linkage mechanism includes an operating rod fixedly connected to the stationary arc contact, a shift fork hinged to the stationary contact seat, and a second linkage pin fixed to the inner linkage rod. One end of the shift fork is provided with a linkage opening, and the other end is fixed with a third linkage pin. The operating rod is provided with a radially extending long groove. The third linkage pin is inserted into the long groove and can move along the long groove. When closing the circuit, the second linkage pin can follow the collision and enter the linkage opening to actuate the shift fork to rotate. The rotation of the shift fork is converted into the linear action of the operating rod by the movement of the third linkage pin along the long groove.

[0020] As a further improvement, an insulating support cylinder located outside the stationary main contact is connected between the stationary end assembly and the moving end assembly.

[0021] As a further improvement, a stationary end gas outlet for hot air flow is provided at the end of the stationary support away from the stationary main contact. A flow guide is connected to the stationary support, and an annular first gap is provided between the flow guide and the stationary support. The first gap is used to allow the hot air flow to flow towards the stationary main contact. A stationary end shielding cylinder covered by the flow guide is also fixed on the stationary support. An annular second gap is provided between the stationary end shielding cylinder and the flow guide, and the second gap is connected to the first gap so that the hot air flow from the first gap can flow away from the stationary main contact.

[0022] As a further improvement, a moving end gas outlet for discharging heated air is provided at the end of the moving support away from the moving main contact. A moving end shielding cylinder is fixed on the moving support and covers the moving end gas outlet. An annular gap is provided between the moving end shielding cylinder and the moving support, and the heated airflow moves in the direction away from the moving main contact through this gap.

[0023] As a further improvement, the moving end gas outlet includes multiple exhaust ports circumferentially spaced on the moving support. A guide seat is fixed on the moving support, which is used to disperse and guide the hot gas flow inside the moving support to each exhaust port.

[0024] This invention is an improved invention, and its beneficial effects are as follows: The circuit breaker provided by this invention adopts a novel arc-extinguishing chamber. This arc-extinguishing chamber is still a double-acting arc-extinguishing chamber. The moving arc contact and the stationary arc contact can move in opposite directions through the linkage mechanism of the arc contact, thereby increasing the relative speed between the moving and stationary arc contacts, realizing rapid opening and closing of the arc contacts, and improving the breaking capacity of the circuit breaker. Furthermore, the arc-extinguishing chamber provided by this invention also has a shielding cover outside the stationary arc contact. The shielding cover can improve the electric field at the break point, thereby improving the high-current short-circuit breaking capacity of the circuit breaker. Simultaneously, when the circuit breaker is closed, the shielding cover linkage mechanism can move the shielding cover in the same direction as the moving main contact. This serves two purposes: firstly, it avoids the moving main contact; secondly, it increases the breaking distance between the shielding cover and the moving main contact, effectively improving the insulation capacity between the breaks, and thus improving the high-current short-circuit breaking capacity of the circuit breaker.

[0025] To achieve the above objectives, the technical solution for GIS provided by this invention is as follows: A GIS includes a circuit breaker, which includes an operating mechanism and an arc-extinguishing chamber. The arc-extinguishing chamber includes a stationary end assembly and a moving end assembly. The stationary end assembly includes a stationary support and a stationary main contact fixed relative to the stationary support. A stationary arc contact that can move back and forth is mounted on the stationary support. The moving end assembly includes a moving support and a moving main contact that can move back and forth relative to the moving support. A moving arc contact and a large nozzle are mounted on the moving main contact. A shielding cover is mounted on the stationary support, covering the stationary arc contact and located inside the stationary main contact. The shielding cover can move back and forth along the stationary support. The large nozzle is connected to a shielding cover linkage mechanism and an arc contact linkage mechanism, so that when the circuit is closed, the shielding cover linkage mechanism is used to move the shielding cover and the moving arc contact in the same direction, and the arc contact linkage mechanism is used to move the stationary arc contact and the moving arc contact in opposite directions.

[0026] As a further improvement, the shielding cover linkage mechanism includes an inner linkage rod fixedly connected to the large nozzle and an outer linkage rod fixedly connected to the shielding cover. The outer linkage rod is fixedly connected to a slider, and the inner linkage rod is hinged to a connecting plate. The slider has a radially extending groove, the connecting plate is fixed with a first linkage pin, and a guide rail is fixed on the stationary support. The guide rail has a guide groove, and the first linkage pin is inserted into both the groove and the guide groove and can move along the groove and the guide groove, so that the shielding cover moves in coordination through the connecting plate, slider, first linkage pin, and guide rail.

[0027] As a further improvement, the inner linkage rod, the outer linkage rod, and the connecting plate are each provided in pairs and are symmetrical about the arc-extinguishing chamber axis. The slider is provided with a pair of sliding grooves symmetrical about the arc-extinguishing chamber axis, and the guide rail is provided with a pair of guide grooves symmetrical about the arc-extinguishing chamber axis.

[0028] As a further improvement, the arc contact linkage mechanism includes an operating rod fixedly connected to the stationary arc contact, a shift fork hinged to the stationary contact seat, and a second linkage pin fixed to the inner linkage rod. One end of the shift fork is provided with a linkage opening, and the other end is fixed with a third linkage pin. The operating rod is provided with a radially extending long groove. The third linkage pin is inserted into the long groove and can move along the long groove. When closing the circuit, the second linkage pin can follow the collision and enter the linkage opening to actuate the shift fork to rotate. The rotation of the shift fork is converted into the linear action of the operating rod by the movement of the third linkage pin along the long groove.

[0029] As a further improvement, an insulating support cylinder located outside the stationary main contact is connected between the stationary end assembly and the moving end assembly.

[0030] As a further improvement, a stationary end gas outlet for hot air flow is provided at the end of the stationary support away from the stationary main contact. A flow guide is connected to the stationary support, and an annular first gap is provided between the flow guide and the stationary support. The first gap is used to allow the hot air flow to flow towards the stationary main contact. A stationary end shielding cylinder covered by the flow guide is also fixed on the stationary support. An annular second gap is provided between the stationary end shielding cylinder and the flow guide, and the second gap is connected to the first gap so that the hot air flow from the first gap can flow away from the stationary main contact.

[0031] As a further improvement, a moving end gas outlet for discharging heated air is provided at the end of the moving support away from the moving main contact. A moving end shielding cylinder is fixed on the moving support and covers the moving end gas outlet. An annular gap is provided between the moving end shielding cylinder and the moving support, and the heated airflow moves in the direction away from the moving main contact through this gap.

[0032] As a further improvement, the moving end gas outlet includes multiple exhaust ports circumferentially spaced on the moving support. A guide seat is fixed on the moving support, which is used to disperse and guide the hot gas flow inside the moving support to each exhaust port.

[0033] This invention is an improved invention, and its beneficial effects are as follows: The GIS provided by this invention configures a novel arc-extinguishing chamber for the circuit breaker. This arc-extinguishing chamber is still a double-acting arc-extinguishing chamber. The moving arc contact and the stationary arc contact can move in opposite directions through the linkage mechanism of the arc contact, thereby increasing the relative speed between the moving and stationary arc contacts, realizing rapid opening and closing of the arc contacts, and improving the breaking capacity of the circuit breaker. Furthermore, the arc-extinguishing chamber provided by this invention also has a shielding cover outside the stationary arc contact. The shielding cover can improve the electric field at the break point, thereby improving the high-current short-circuit breaking capacity of the circuit breaker. Simultaneously, when the circuit breaker is closed, the shielding cover linkage mechanism can move the shielding cover in the same direction as the moving main contact. This serves two purposes: firstly, it avoids the moving main contact; secondly, it increases the breaking distance between the shielding cover and the moving main contact, effectively improving the insulation capacity between the breaks, and thus improving the high-current short-circuit breaking capacity of the circuit breaker. Attached Figure Description

[0034] Figure 1 This is a structural cross-sectional view (opening state) of the arc-extinguishing chamber embodiment in this invention. Figure 2 This is a partial schematic diagram showing the positions of the moving end assembly and the stationary end assembly in the arc-extinguishing chamber embodiment of the present invention; Figure 3 for Figure 1 A magnified view of the second connecting rod in the middle section; Figure 4 for Figure 1 Schematic diagram of the structure of the second connecting plate; Figure 5 for Figure 1 A cross-sectional view of the second connecting plate.

[0035] Explanation of reference numerals in the attached figures: 1. Insulating pull rod; 2. Moving end pull rod; 3. Moving arc contact; 4. Moving main contact; 5. Large nozzle; 6. Inner linkage rod; 7. Second linkage pin; 8. Shift fork; 9. Pin shaft; 10. Third linkage pin; 11. Operating rod; 12. Static arc contact; 13. Connecting plate; 14. Outer linkage rod; 15. Shielding cover; 16. Static support; 17. Flow guide; 18. Exhaust port; 19. Moving end shielding cylinder; 20. Air guide seat; 21. Guide rail; 22. Broken end insulating support cylinder; 23. Insulating cylinder; 24. Insulating pressure ring; 25. Fixed flange; 26. Static end shielding cylinder; 27. Moving support; 28. Slider; 281. Bolt hole; 282. Slide groove; 29. ​​First linkage pin; 30. Guide groove; 100. Static end hot airflow path; 200. Moving end hot airflow path. Detailed Implementation

[0036] With the rapid development of urbanization and industrialization, the power grid load is also increasing rapidly. The short-circuit breaking capacity of the currently used 252kV circuit breakers is no longer sufficient to reliably ensure the safe and stable operation of the system. To solve this problem, the basic concept of this invention is to cover the stationary arc contact of the double-acting arc-extinguishing chamber with a shield, and to configure the shield to move in the same direction as the moving arc contact to improve the electric field at the break point. At the same time, while ensuring the normal opening and closing of the moving main contact, a greater insulation distance is maintained between the shield and the moving main contact, thereby improving the high-current short-circuit breaking capacity of the circuit breaker.

[0037] Based on the above concept, the present invention will be further described in detail below with reference to the embodiments.

[0038] Specific embodiments of the arc-extinguishing chamber provided by the present invention: The arc-extinguishing chamber provided in this embodiment is as follows: Figure 1 As shown, it is a core component of the circuit breaker and can be assembled into the corresponding installation position of the circuit breaker via the insulating cylinder 23. Generally speaking, the arc-extinguishing chamber can be divided into two main parts: the stationary end assembly and the moving end assembly. The main components of the stationary end assembly and the moving end assembly are basically the same as those of existing arc-extinguishing chambers. Specifically: like Figure 1 and Figure 2 As shown, the stationary end assembly includes a stationary support 16 and a stationary main contact fixed relative to the stationary support 16. It should be noted that the stationary support 16 can be understood as the overall base of the stationary end assembly for assembling and installing other components. A stationary arc contact 12 is mounted on the stationary support 16. The stationary arc contact 12 can be understood as the arc contact of the stationary end. The stationary arc contact 12 can actually move back and forth relative to the stationary support 16. It should be noted that the back and forth direction in this art generally refers to the direction of contact movement during opening and closing, i.e., the axial direction of the arc-extinguishing chamber. The specific installation method of the stationary main contact on the stationary support 16, and the assembly method of the stationary contact's back-and-forth guiding movement on the stationary support 16, can be consistent with the existing double-acting arc-extinguishing chamber, which is understood by those skilled in the art and will not be described in detail here.

[0039] Similarly, Figure 1 and Figure 2As shown, the moving end assembly includes a moving support 27, which can be understood as the overall foundation for assembling and installing the various parts of the moving end assembly. A moving main contact 4, movable relative to the moving support 27, is mounted on the moving support 27. The moving main contact 4 is connected to a moving end pull rod 2 (hollow structure), which is connected to an insulating pull rod 1. The insulating pull rod 1 can also connect to the circuit breaker's operating mechanism, allowing the contact to move under the influence of the operating mechanism. A moving arc contact 3 and a large nozzle 5 (commonly known in the art) are mounted on the moving main contact 4. The moving arc contact 3 and the large nozzle 5 can move with the moving main contact 4. Specifically, the large nozzle 5 can be fixed to the moving arc contact 3 with bolts via an insulating pressure ring 24.

[0040] A shielding cover 15 is mounted on the stationary support 16. This shielding cover 15 covers the stationary arc contact 12 and is located inside the stationary main contact. This shielding cover 15 can move back and forth along the stationary support 16.

[0041] The large nozzle 5 is connected to a shielding cover linkage mechanism. As the name suggests, this mechanism links the movement of the large nozzle 5 to the shielding cover 15. Specifically, when the circuit breaker is opening or closing, the moving main contact 4 can move closer to the stationary main contact, and the shielding cover linkage mechanism can drive the shielding cover 15 to move in the same direction as the moving main contact 4. Figure 2 For example, when closing the circuit breaker, the large nozzle 5 moves to the left, which can drive the shielding cover 15 to move to the left synchronously through the shielding cover linkage mechanism. Similarly, when opening the circuit breaker, the large nozzle 5 moves to the right, which can drive the shielding cover 15 to move to the right synchronously through the shielding cover linkage mechanism. That is, whether opening or closing the circuit breaker, the direction of movement of the shielding cover 15 is the same as that of the moving main contact 4.

[0042] The large nozzle 5 is connected to an arc contact linkage mechanism. As the name suggests, the moving contact linkage mechanism links the movement of the large nozzle 5 with the stationary arc contact 12. Specifically, when the circuit breaker is opening or closing, the moving arc contact 3 can move closer to the stationary arc contact 12, and the arc contact linkage mechanism can drive the stationary arc contact 12 to move in the opposite direction to the moving arc contact 3. Figure 2 For example, when closing the circuit, the large nozzle 5 moves to the left, which can drive the stationary arc contact 12 to move to the right through the arc contact linkage mechanism. Of course, when opening the circuit, the large nozzle 5 moves to the right, which can drive the moving arc contact 3 to move to the left through the arc contact linkage mechanism.

[0043] As described above, the moving arc contact 3 and the stationary arc contact 12 of the arc-extinguishing chamber provided in this embodiment can move in opposite directions through the arc contact linkage mechanism, thereby increasing the relative speed between the moving arc contact 3 and the stationary arc contact 12, achieving rapid opening and closing of the arc contacts, and improving the circuit breaker's breaking capacity. Furthermore, the arc-extinguishing chamber is equipped with a shielding cover 15 outside the stationary arc contact 12. The shielding cover 15 can improve the electric field at the break point, thereby enhancing the circuit breaker's high-current short-circuit breaking capacity. Simultaneously, when the circuit breaker is closed, the shielding cover linkage mechanism can move the shielding cover 15 in the same direction as the moving main contact 4. This serves two purposes: firstly, it avoids the moving main contact 4; secondly, it increases the breaking distance between the shielding cover 15 and the moving main contact 4, effectively improving the insulation capacity between the breaks, and thus enhancing the circuit breaker's high-current short-circuit breaking capacity.

[0044] In some feasible implementations, such as Figures 1-5 As shown, the shielding cover linkage mechanism includes an inner linkage rod 6 fixedly connected to the large nozzle 5 and an outer linkage rod 14 fixedly connected to the shielding cover 15. Here, "fixedly connected" refers to a fixed connection, and "inner" and "outer" refer to their radial relative positions. For example, the large nozzle 5 can be fixedly connected to the inner linkage rod 6 via a fixed flange 25. The outer linkage rod 14 is fixedly connected to a slider 28, which can be connected by bolts, with bolt holes 281 correspondingly provided on the slider 28. The inner linkage rod 6 is hinged to a connecting plate 13, which can be hinged via a pin 9. The slider 28 has a radially extending groove 282, and the connecting plate 13 is fixed with a linkage pin, which can be defined as the first linkage pin 29 for ease of description. A guide rail 21 is fixed on the stationary support 16, and the guide rail 21 has a guide groove 30. The first linkage pin 29 is inserted into both the groove 282 and the guide groove 30, and can move along both the groove 282 and the guide groove 30.

[0045] by Figure 2 As shown in the example, when the circuit breaker is closed, the large nozzle 5 can drive the inner linkage rod 6 to move to the left, and the inner linkage rod 6 can drive the connecting plate 13 to swing. At the same time, under the constraint of the slide groove 282 and the guide groove 30, the connecting plate 13 can drive the slider 28 to move linearly to the left, thereby pulling the outer linkage rod 14 to move, and thus linking the shielding cover 15 to move. That is to say, the shielding cover linkage mechanism links the shielding cover 15 to move through the cooperation of the connecting plate 13, the slider 28, the first linkage pin 29, and the guide rail 21.

[0046] In a preferred embodiment, the shielding cover linkage mechanism has two inner linkage rods 6, two outer linkage rods 14, and two connecting plates 13, all symmetrical about the arc-extinguishing chamber axis. A pair of sliding grooves 282 symmetrical about the arc-extinguishing chamber axis are provided on the slider 28, and a pair of guide grooves 30 symmetrical about the arc-extinguishing chamber axis are provided on the guide rail 21. This ensures that each rod and part of the connecting plate 13 is subjected to symmetrical forces, improving the operational reliability of the shielding cover linkage mechanism.

[0047] Based on the above implementation method, the arc contact linkage mechanism can be linked with the inner linkage rod 6. Specifically, the arc contact linkage mechanism includes an operating rod 11 fixedly connected to the stationary arc contact 12 (which can be connected by bolts), a shift fork 8 hinged to the stationary contact seat, and a linkage pin (which can be defined as the second linkage pin 7) fixed on the inner linkage rod 6. One end of the shift fork 8 is provided with a linkage opening, and the other end is fixed with a linkage pin (which can be defined as the third linkage pin 10). The operating rod 11 is provided with a radially extending long groove, and the third linkage pin 10 is inserted into the long groove and can move along the long groove.

[0048] by Figure 2 As shown in the example, when closing the circuit, the second linkage pin 7 moves to the left with the inner linkage rod 6, collides with and enters the linkage opening of the shift fork 8, thereby causing the shift fork 8 to rotate. The rotation of the shift fork 8 is converted into the direct motion of the operating rod 11 by the movement of the third linkage pin 10 along the long slot. When opening the circuit, the process is reversed.

[0049] If the inner linkage rod 6 is arranged symmetrically, the shift fork 8 and the second linkage pin 7 can also be arranged symmetrically in pairs.

[0050] It should be noted that the above are only examples of some preferred embodiments that are structurally reliable and easy to implement. In some other embodiments, the shielding cover linkage mechanism and the arc contact linkage mechanism can be adopted in other ways, such as the linkage slider 28 mechanism, cam mechanism, gear mechanism, etc. The above preferred embodiments should not be construed as limiting the scope of protection.

[0051] In some preferred embodiments, such as Figure 1 and Figure 2 As shown, an insulating support cylinder located outside the stationary main contact is connected between the stationary end assembly and the moving end assembly.

[0052] In this preferred embodiment, the break-insulating support cylinder 22 used in the arc-extinguishing chamber serves as a reliable bridge connecting the moving and stationary ends of the arc-extinguishing chamber, enabling the arc-extinguishing chamber to be assembled as a single unit and ensuring reliable alignment of the moving and stationary contacts. Simultaneously, it improves the insulation environment of the arc-extinguishing chamber break, effectively guaranteeing the insulation performance of the arc-extinguishing chamber break, enhancing the insulation capacity between the arc-extinguishing chamber breaks, and strengthening the arc-extinguishing chamber's breaking capacity.

[0053] In some preferred embodiments, such as Figure 1As shown, a stationary end gas outlet for hot air flow is provided at the end of the stationary support 16 away from the stationary main contact, for example, an exhaust hole 18 can be provided. A flow guide shroud 17 is connected to the stationary support 16, and an annular gap (which can be defined as the first gap) is provided between the flow guide shroud 17 and the stationary support 16. The first gap is used to allow the hot air flow to flow in the direction closer to the stationary main contact. A stationary end shielding cylinder 26 is also fixed on the stationary support 16 and covers the flow guide shroud 17. An annular gap (which can be defined as the second gap) is provided between the stationary end shielding cylinder 26 and the flow guide shroud 17. The second gap is connected to the first gap so that the hot air flow from the first gap can flow in the direction away from the stationary main contact.

[0054] This preferred embodiment, by configuring the flow guide shroud 17 and the stationary end shielding cylinder 26, can form such a... Figure 1 The hot airflow path 100 at the stationary end, as indicated by the arrow, allows the hot airflow to be dispersed through the exhaust hole 18 on the stationary support 16 into the inner cavity of the guide shroud 17 during high-current interruption. Then, the airflow is axially guided to diffuse into the low-temperature region of the atmospheric chamber along the evacuation channel formed by the outer wall of the stationary support 16 and the stationary end shielding cylinder 26. This avoids the hot airflow from directly blowing radially against the cylinder wall during high-current interruption, which could lead to grounding breakdown. This effectively improves the cooling efficiency of the hot airflow at the stationary end of the arc-extinguishing chamber during interruption, enhances the grounding insulation performance and reliability of the circuit breaker's arc-extinguishing chamber, and thus helps to achieve effective interruption of the arc-extinguishing chamber. In turn, it can meet the interruption requirements of the arc-extinguishing chamber for large-capacity short-circuit currents.

[0055] In some preferred embodiments, such as Figure 1 As shown, a moving end gas outlet for discharging heated air is provided at the end of the moving support 27 away from the moving main contact 4. A moving end shielding cylinder 19 is fixed on the moving support 27 and covers the moving end gas outlet. An annular gap is provided between the moving end shielding cylinder 19 and the moving support 27. The heated air moves in the direction away from the moving main contact 4 through this gap.

[0056] This preferred embodiment, by configuring the moving end shielding cylinder 19, can form such a Figure 1 The hot airflow path 200 at the moving end, as indicated by the arrow, allows the hot airflow to be dispersed through the moving end pull rod 2 to the inner cavity of the moving support 27 during high-current interruption. Then, the airflow is axially guided to diffuse into the low-temperature region of the atmospheric chamber along the evacuation channel formed by the outer wall of the moving support 27 and the moving end shielding cylinder 19. This prevents the hot airflow at the moving end of the arc-extinguishing chamber from being directly blown radially onto the cylinder wall, thereby allowing the hot airflow generated during the interruption process to gradually diffuse axially into the low-temperature region of the arc-extinguishing chamber. This effectively improves the cooling efficiency of the hot airflow at the moving end of the arc-extinguishing chamber during the interruption process and enhances the interruption capability of the arc-extinguishing chamber.

[0057] Preferably, the aforementioned moving-end gas outlet includes multiple exhaust ports circumferentially spaced on the moving support 27. A gas guide seat 20 is also fixed on the moving support 27, with one end of the gas guide seat 20 having a tapered structure to disperse and guide the hot airflow within the moving support 27 to each exhaust port. This further guides the diffusion of the hot airflow at the moving end, preventing the hot airflow at the moving end of the arc-extinguishing chamber from blowing against the insulating rod 1, thus preventing the insulating rod 1 from undergoing thermal breakdown due to the hot airflow, and effectively ensuring its insulation performance.

[0058] Specific embodiments of the circuit breaker provided by this invention: The circuit breaker includes an operating mechanism and an arc-extinguishing chamber. The specific structure of the arc-extinguishing chamber is the same as the implementation method of the arc-extinguishing chamber described above, and will not be described in detail here.

[0059] Specific implementation methods of the GIS provided by this invention: GIS includes circuit breakers, which include operating mechanisms and arc-extinguishing chambers. The specific structure of the arc-extinguishing chamber is consistent with the implementation method of the arc-extinguishing chamber described above, and will not be described in detail here.

[0060] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An arc-extinguishing chamber, comprising a stationary end assembly and a moving end assembly, the stationary end assembly including a stationary support and a stationary main contact fixed relative to the stationary support, the stationary support being equipped with a stationary arc contact that can move back and forth, the moving end assembly including a moving support and a moving main contact that can move back and forth relative to the moving support, the moving main contact being equipped with a moving arc contact and a large nozzle, characterized in that, The static support is provided with a shielding cover which is arranged outside the static arc contact and inside the static main contact, and the shielding cover is movable along the static support, the large nozzle is connected with a shielding cover linkage mechanism and an arc contact linkage mechanism, so that the shielding cover and the moving arc contact move in the same direction through the shielding cover linkage mechanism, and the static arc contact and the moving arc contact move towards each other through the arc contact linkage mechanism when the circuit breaker is closed.

2. The arc chute of claim 1 wherein the shield The linkage mechanism comprises an inner linkage rod fixed to the large nozzle and an outer linkage rod fixed to the shielding cover, the outer linkage rod is fixed with a sliding block, the inner linkage rod is hinged with a connecting plate, the sliding block is provided with a radially extending sliding groove, the connecting plate is fixed with a first linkage pin, a guide rail is fixed to the static support, the guide rail is provided with a guide groove, and the first linkage pin is inserted into the sliding groove and the guide groove and is movable along the sliding groove and the guide groove, so that the shielding cover is linked and moved through the cooperation of the connecting plate, the sliding block, the first linkage pin and the guide rail.

3. The arc chute of claim 2, wherein the inner surface of the arc chute is substantially cylindrical. The linkage rod, the outer linkage rod and the connecting plate are each provided with two parts which are symmetrical about the axis of the arc extinguishing chamber, the sliding block is provided with a pair of sliding grooves which are symmetrical about the axis of the arc extinguishing chamber, and the guide rail is provided with a pair of guide grooves which are symmetrical about the axis of the arc extinguishing chamber.

4. The arc chute according to claim 2 or 3, characterized in that The arc contact linkage mechanism comprises an operating rod fixed to the static arc contact, a shifting fork hinged to the static contact seat and a second linkage pin fixed to the inner linkage rod, one end of the shifting fork is provided with a linkage opening, the other end is fixed with a third linkage pin, the operating rod is provided with a radially extending long groove, the third linkage pin is inserted into the long groove and is movable along the long groove, and when the circuit breaker is closed, the second linkage pin can enter the linkage opening through a collision, so as to shift the shifting fork to rotate, and the rotation of the shifting fork is converted into the straight motion of the operating rod through the movement of the third linkage pin along the long groove.

5. The arc chute according to any one of claims 1 to 3, characterized in that An insulating support cylinder is arranged outside the static main contact between the static end assembly and the moving end assembly.

6. The arc chute according to any one of claims 1 to 3, characterized in that A static end gas outlet is arranged at one end of the static support away from the static main contact, a flow guide cover is connected to the static support, an annular first space is arranged between the flow guide cover and the static support, the first space is used for guiding the hot gas to flow towards the static main contact, and a static end shielding cylinder is arranged outside the flow guide cover and fixed to the static support, an annular second space is arranged between the static end shielding cylinder and the flow guide cover, and the second space is communicated with the first space, so as to guide the hot gas to flow away from the static main contact.

7. The arc chute according to any one of claims 1 to 3, characterized in that A moving end gas outlet is arranged at one end of the moving support away from the moving main contact, a moving end shielding cylinder is arranged outside the moving end gas outlet and fixed to the moving support, and an annular space is arranged between the moving end shielding cylinder and the moving support, so as to guide the hot gas to move away from the moving main contact.

8. The arc chute of claim 7 wherein, The moving end gas outlet comprises a plurality of gas outlets which are arranged on the moving support in a circumferential direction, and a gas guide seat is fixed to the moving support, so as to disperse and guide the hot gas in the moving support to the gas outlets.

9. A circuit breaker comprising an operating mechanism and an arc chute, characterized in that The arc extinguishing chamber is the arc extinguishing chamber of any one of claims 1-8.

10. A GIS comprising a circuit breaker, the circuit breaker comprising an operating mechanism and an arc chute, characterized in that, The arc extinguishing chamber is the arc extinguishing chamber of any one of claims 1-8.

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