Nozzle assembly and gas insulated circuit breaker

Abstract

The utility model relates to circuit breaker technical field discloses a kind of nozzle assembly and gas insulation circuit breaker.Nozzle assembly includes main nozzle and auxiliary nozzle, main nozzle is made of insulating material, the first end of main nozzle is configured to be connected with the dynamic side support assembly of gas insulation circuit breaker, and the outer periphery of second end is provided with outer thread part and first tool withdrawal groove;Auxiliary nozzle is made of insulating material, is sleeved in the second end of main nozzle, and is used to be slidably matched with the static side support assembly of gas insulation circuit breaker, and the inner wall of auxiliary nozzle is provided with inner thread part and second tool withdrawal groove, and inner thread part is connected with outer thread part by screw thread;Nozzle assembly is provided with communication structure, communication structure is set through auxiliary nozzle, and first tool withdrawal groove and second tool withdrawal groove are all communicated with communication structure.The nozzle assembly of the utility model is low in manufacturing difficulty, and is not easy to be electrically punctured when being installed into gas insulation circuit breaker, and has good insulation.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a nozzle assembly and a gas-insulated circuit breaker. Background Technology

[0002] Gas-insulated circuit breakers are characterized by high insulation strength, strong arc extinguishing capability, strong environmental adaptability, and compact structure, and are widely used in medium and high voltage fields and special environments.

[0003] The gas-insulated circuit breaker includes a moving contact, a moving-side support assembly, a stationary contact, and a stationary-side support assembly. The moving contact is supported on the moving-side support assembly and includes a moving main contact and a moving arc contact. The stationary contact is supported on the stationary-side support assembly and includes a stationary main contact and a stationary arc contact. The moving-side support assembly is connected to the circuit breaker's operating mechanism and can be moved closer to or further away from the stationary-side support assembly, thereby enabling the moving and stationary main contacts to connect or disconnect, and enabling the moving and stationary arc contacts to connect or disconnect. The gas-insulated circuit breaker also includes a nozzle assembly and a gas chamber. The nozzle assembly is an insulated structure and generally cylindrical, with one end connected to the moving-side support assembly and the other end slidingly engaged with the stationary-side support assembly, and sleeved around the outer periphery of the stationary and moving arc contacts, thus isolating the stationary and stationary arc contacts, and isolating the moving main and moving arc contacts. The cylinder and the nozzle assembly are internally connected. When the moving arc contact and the stationary arc contact separate, the volume of the air chamber is compressed, and the insulating gas in the air chamber is blown into the nozzle assembly, thereby extinguishing the arc generated by the stationary arc contact and the moving arc contact.

[0004] In related technologies, some nozzle assemblies are integrally molded. Due to factors such as coaxiality and fitting precision, this integral molding method results in high manufacturing difficulty and cost for the nozzle assemblies. Other nozzle assemblies are split structures, including a main nozzle and an auxiliary nozzle. One end of the main nozzle is fixedly connected to the moving-side support assembly and fitted with a stationary arc contact and a moving arc contact. The auxiliary nozzle is connected to the other end of the main nozzle via a threaded connection for sliding engagement with the stationary-side support assembly. This method can reduce the overall processing cost of the nozzle assembly. However, the applicant found that setting the nozzle assembly as a split structure leads to a decrease in its insulation performance. Under certain circumstances, the nozzle assembly may be broken down by electric arc, causing the circuit breaker to fail to trip, creating a safety hazard.

[0005] Therefore, there is an urgent need for a nozzle assembly and a gas-insulated circuit breaker to solve the above-mentioned technical problems. Utility Model Content

[0006] One objective of this invention is to provide a nozzle assembly that is easy to manufacture and is not easily electrically broken down when installed in a gas-insulated circuit breaker, and has good insulation properties.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] Nozzle assembly for use in a gas-insulated circuit breaker, the nozzle assembly comprising:

[0009] The main nozzle is made of insulating material. The first end of the main nozzle is configured to connect with the moving side support assembly of the gas-insulated circuit breaker, and the outer periphery of the second end is provided with an external thread and a first unscrew groove.

[0010] An auxiliary nozzle, made of insulating material, is fitted onto the second end of the main nozzle and is used to slide in cooperation with the stationary side support assembly of the gas-insulated circuit breaker. The inner wall of the auxiliary nozzle is provided with an internal thread and a second relief groove, and the internal thread is threadedly connected to the external thread.

[0011] The nozzle assembly is provided with a connecting structure that extends through the auxiliary nozzle, and both the first and second retraction grooves are connected to the connecting structure.

[0012] As an alternative, along the axial direction of the auxiliary nozzle, the first and second relief grooves are respectively located on both sides of the internal thread portion.

[0013] The connecting structure includes a connecting hole and a first groove, wherein the connecting hole is disposed on and extends through the auxiliary nozzle; wherein:

[0014] The inner wall of the auxiliary nozzle is provided with the first groove, which penetrates the internal threaded portion along the axial direction of the auxiliary nozzle to connect the first relief groove and the second relief groove. The first relief groove, the second relief groove, or the first groove communicates with the connecting hole; and / or

[0015] The outer wall of the main nozzle is provided with the first cutting groove, which penetrates the external threaded portion along the axial direction of the main nozzle to connect the first retraction groove and the second retraction groove. The first retraction groove, the second retraction groove, or the first cutting groove is connected to the connecting hole.

[0016] As an optional solution, a retaining protrusion is provided on the outer wall of the main nozzle, and the retaining protrusion is located on the side of the external threaded portion near the first end of the main nozzle;

[0017] The auxiliary nozzle is provided with a hook at the first end near the main nozzle. The end of the auxiliary nozzle is elastically deformable so that when the auxiliary nozzle is fitted onto the second end of the main nozzle, the hook can pass over the protrusion and hook onto the protrusion.

[0018] As an optional solution, the auxiliary nozzle is provided with a plurality of second grooves at the end near the first end of the main nozzle. The plurality of second grooves are spaced apart circumferentially along the auxiliary nozzle, and there is an elastic deformation portion between adjacent second grooves. The free end of the elastic deformation portion is provided with the hook.

[0019] As an optional solution, the connecting structure includes a connecting hole and a first groove. The connecting hole is disposed on the auxiliary nozzle and extends through the auxiliary nozzle. The first groove is disposed on the main nozzle or the auxiliary nozzle and connects the first retraction groove and the second retraction groove.

[0020] The first relief groove is disposed on one side of the external thread portion near the first end of the main nozzle, and at least part of the second groove forms the connecting hole and communicates with the first relief groove.

[0021] As an optional solution, the protrusion includes a first stop surface, which is perpendicular to the axial direction of the main nozzle and faces the first end of the main nozzle;

[0022] The hook includes a second stop surface, which is perpendicular to the axial direction of the main nozzle and faces the second end of the main nozzle. The first stop surface abuts against the second stop surface.

[0023] As an optional embodiment, the latching protrusion further includes a first guide surface disposed on the side of the first stop surface facing the second end of the main nozzle. The first guide surface is inclined relative to the axial direction of the main nozzle and is used to guide the latch hook over the latching protrusion during assembly; and / or

[0024] The hook also includes a second guide surface, which is disposed on the side of the second guide surface facing the first end of the main nozzle. The second guide surface is inclined relative to the axial direction of the main nozzle and is used to allow the hook to pass over the protrusion during assembly.

[0025] Another objective of this invention is to provide a gas-insulated circuit breaker that, by employing the aforementioned nozzle assembly, achieves high reliability in circuit breaking.

[0026] To achieve this objective, the present invention adopts the following technical solution:

[0027] The gas-insulated circuit breaker, including the nozzle assembly, further includes:

[0028] The moving contact assembly includes a moving side support assembly, a moving main contact, and a moving arc contact. The moving main contact and the moving arc contact are both mounted on the moving side support assembly. The first end of the main nozzle is connected to the moving side support assembly. The moving arc contact is disposed inside the nozzle assembly, and the moving main contact is disposed outside the nozzle assembly.

[0029] A stationary contact assembly includes a stationary side support assembly, a stationary main contact, and a stationary arc contact. The stationary main contact and the stationary arc contact are both mounted on the stationary side support assembly. The auxiliary nozzle is slidably engaged with the stationary side support assembly. The stationary arc contact extends at least partially into the nozzle assembly, and the stationary main contact is located outside the nozzle assembly.

[0030] When the moving contact assembly and the stationary contact assembly are separated, insulating gas enters from the first end of the main nozzle and is blown toward the moving arc contact and the stationary arc contact.

[0031] As an optional solution, the gas-insulated circuit breaker further includes a fixing component, and a gas cavity is formed between the moving side support component and the fixing component, the gas cavity being connected to the first end of the main nozzle;

[0032] When the moving contact assembly moves away from the stationary contact assembly, the volume of the air chamber decreases, and the insulating gas in the air chamber is blown into the main nozzle.

[0033] As an optional solution, the fixed component or the moving side support component is provided with a first air hole, and a one-way valve is installed at the first air hole. When the moving contact component moves away from the stationary contact component, the one-way valve is closed; when the moving contact component moves closer to the stationary contact component, the one-way valve is opened, and the volume of the air chamber increases.

[0034] The beneficial effects of this utility model are:

[0035] The nozzle assembly of this utility model has a main nozzle whose first end is connected to the moving side support assembly of a gas-insulated circuit breaker, and an auxiliary nozzle sleeved on the second end of the main nozzle for sliding engagement with the stationary side support assembly of the gas-insulated circuit breaker. By setting the nozzle assembly as two parts, the complexity of individual parts can be reduced, thereby reducing processing difficulty and cost. The second end of the main nozzle is provided with an external threaded portion that is threadedly connected to the internal threaded portion of the auxiliary nozzle, ensuring the reliability of the connection between the main nozzle and the auxiliary nozzle. In addition, after the auxiliary nozzle is threadedly connected to the main nozzle, cavities are formed at the first relief groove formed by machining the external threaded portion and the second relief groove formed by machining the internal threaded portion. By providing a connecting structure that extends through the auxiliary nozzle, and... By connecting both the first and second retraction slots to the connecting structure, a closed space can be avoided between the auxiliary nozzle and the main nozzle. Therefore, during the vacuuming process in the gas-insulated circuit breaker assembly, the air in the first and second retraction slots can be discharged through the connecting structure. Furthermore, during the filling of insulating gas, the first and second retraction slots can be filled with insulating gas, thus eliminating the storage of air inside the nozzle assembly, improving the insulation of the nozzle assembly, and preventing the nozzle assembly from being broken down by electric arc during the breaking process between the moving contact assembly and the stationary contact assembly, or from high-voltage breakdown between the passive contact assembly and the stationary contact assembly after breaking. This ensures the insulation performance of the break between the moving contact assembly and the stationary contact assembly, thereby guaranteeing the reliability of the circuit breaker's breaking.

[0036] The gas-insulated circuit breaker of this invention, by employing the aforementioned nozzle assembly, achieves high reliability in circuit breaking. Attached Figure Description

[0037] Figure 1 This is a partial structural schematic diagram of the gas-insulated circuit breaker provided in a specific embodiment of this utility model;

[0038] Figure 2 This is a cross-sectional view of the nozzle assembly provided in a specific embodiment of this utility model;

[0039] Figure 3 yes Figure 2 Enlarged view of point A in the image;

[0040] Figure 4 This is a schematic diagram of the main nozzle structure provided in a specific embodiment of this utility model;

[0041] Figure 5 This is a cross-sectional view of the main nozzle provided in a specific embodiment of this utility model;

[0042] Figure 6 This is a schematic diagram of the structure of the auxiliary nozzle provided in a specific embodiment of this utility model;

[0043] Figure 7This is a cross-sectional view of the auxiliary nozzle provided in a specific embodiment of this utility model.

[0044] In the picture:

[0045] 10. Nozzle assembly;

[0046] 11. Main nozzle; 111. External threaded section; 112. First relief groove; 113. Locking protrusion; 1131. First stop surface; 1132. First guide surface; 114. Third flange section;

[0047] 12. Auxiliary nozzle; 121. Internal threaded part; 122. Second relief groove; 123. Connecting hole; 124. First cutting groove; 125. Hook; 1251. Second stop surface; 1252. Second guide surface; 126. Second cutting groove; 127. Elastic deformation part; 128. Fourth flange part; 1281. Protrusion; 129. Groove; 120. Connecting structure;

[0048] 13. Guide ring;

[0049] 20. Moving contact assembly; 21. Moving side support assembly; 211. Cylinder body; 212. Cylinder seat; 2121. Second air port; 213. Air guide pipe; 22. Moving main contact; 23. Moving arc contact; 231. Hook;

[0050] 30. Stationary contact assembly; 31. Stationary side support assembly; 311. First flange portion; 32. Stationary main contact; 33. Stationary arc contact;

[0051] 40. Fixing component; 41. Fixing base; 42. Support component; 421. First vent; 422. Second flange;

[0052] 50. Insulating cylinder;

[0053] 60. Air cavity;

[0054] 70. Check valve. Detailed Implementation

[0055] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not the entire structure.

[0056] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0057] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0058] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0059] This embodiment provides a gas-insulated circuit breaker, such as... Figure 1As shown, the gas-insulated circuit breaker includes a housing (not shown), a fixed assembly 40, a moving contact assembly 20, a stationary contact assembly 30, an insulating cylinder 50, and an operating mechanism (not shown). The operating mechanism is mounted on the housing and is used for closing and opening operations by the user, as well as tripping in the event of an abnormal current in the circuit. The fixed assembly 40, moving contact assembly 20, stationary contact assembly 30, and insulating cylinder 50 are all installed inside the housing. The fixed assembly 40 and stationary contact assembly 30 are arranged opposite each other and fixedly mounted on the housing. One end of the insulating cylinder 50 is connected to the fixed assembly 40, and the other end is connected to the stationary contact assembly 30. A portion of the stationary contact assembly 30 extends into the insulating cylinder 50. The moving contact assembly 20 is mounted on the fixed assembly 40 and slides with it. A portion of the moving contact assembly 20 is disposed inside the insulating cylinder 50, opposite to the stationary contact assembly 30. The operating mechanism is connected to the moving contact assembly 20 and is used to drive the moving contact assembly 20 to slide relative to the fixed assembly 40, thereby moving it closer to or away from the stationary contact assembly 30, thus realizing the closing and opening of the gas-insulated circuit breaker. During the assembly of the gas-insulated circuit breaker, after all components are installed and fixed inside the housing, a vacuum environment needs to be created inside the housing before filling it with insulating gas. The vacuum process removes all air from the housing, while the insulating gas filling process fills the housing with insulating gas, ensuring the insulation between the internal components of the gas-insulated circuit breaker. It should be noted that during normal operation of the gas-insulated circuit breaker, the housing is filled with insulating gas, meaning that both the inside and outside of the insulating cylinder 50 are in an insulating gas atmosphere. Optionally, the insulating gas can be SF6 gas or other existing insulating gases; no limitation is made here.

[0060] Specifically, such as Figure 1As shown, the fixing assembly 40 includes a fixing base 41 and a support member 42. The fixing base 41 is fixedly connected to the housing, and one end of the insulating cylinder 50 is connected to the fixing base 41. The support member 42 has a cylindrical structure, with one end inserted into the fixing base 41 and the other end extending into the insulating cylinder 50. The moving contact assembly 20 includes a moving side support assembly 21, a moving main contact 22, and a moving arc contact 23. The moving side support assembly 21 is slidably engaged with the fixing assembly 40 and connected to the operating mechanism of the circuit breaker. Both the moving main contact 22 and the moving arc contact 23 are mounted on the moving side support assembly 21. In this embodiment, the moving side support assembly 21 is slidably engaged with the support member 42. Both the moving main contact 22 and the moving arc contact 23 are cylindrical components. The moving arc contact 23 is disposed at the end of the moving side support assembly 21, and the moving main contact 22 is arranged around the outside of the moving arc contact 23. The stationary contact assembly 30 includes a stationary side support assembly 31, a stationary main contact 32, and a stationary arc contact 33. The stationary side support assembly 31 is connected to the housing and is generally cylindrical. A first flange 311 is provided on the outer periphery of the stationary side support assembly 31, and the other end of the insulating cylinder 50 is connected to the first flange 311. The stationary arc contact 33 is disposed inside the stationary side support assembly 31. The stationary main contact 32 is cylindrical and is disposed at the end of the stationary side support assembly 31 facing the fixing assembly 40, and the stationary main contact 32 is arranged around the outside of the stationary arc contact 33.

[0061] When the operating mechanism performs a closing operation, the moving contact assembly 20 moves towards the stationary contact assembly 30. The moving main contact 22 contacts and is electrically connected to the stationary main contact 32, and the moving arc contact 23 contacts and is electrically connected to the stationary arc contact 33, thereby achieving circuit continuity. When the operating mechanism performs a opening operation or the gas-insulated circuit breaker trips due to abnormal current, the operating mechanism moves the moving contact assembly 20 away from the stationary contact assembly 30. The moving main contact 22 separates from the stationary main contact 32, and the moving arc contact 23 separates from the stationary arc contact 33, thereby interrupting the current. During current interruption, an electric arc will be generated between the moving contact assembly 20 and the stationary contact assembly 30. To facilitate arc extinguishing, the separation of the moving main contact 22 from the stationary main contact 32 is prioritized over the separation of the moving arc contact 23 from the stationary arc contact 33, so that the arc is mainly generated between the moving arc contact 23 and the stationary arc contact 33. The specific way to separate the moving main contact 22 from the stationary main contact 32 before the moving arc contact 23 and the stationary arc contact 33 can be that the length of the moving arc contact 23 is greater than that of the moving main contact 22, etc., without making specific limitations here.

[0062] To extinguish the arc between the moving arc contact 23 and the stationary arc contact 33, this embodiment also provides a nozzle assembly 10, such as... Figure 1As shown, the nozzle assembly 10 is generally cylindrical. One end of the nozzle assembly 10 is fixedly connected to the moving contact assembly 20, allowing it to move synchronously with the moving contact assembly 20. The other end of the nozzle assembly 10 is slidably engaged with the stationary contact assembly 30. The moving main contact 22 is located outside the nozzle assembly 10, and the moving arc contact 23 is located inside the nozzle assembly 10. The stationary main contact 32 is located outside the nozzle assembly 10, and the stationary arc contact 33 is located inside the nozzle assembly 10. When the moving contact assembly 20 and the stationary contact assembly 30 are disconnected, and the moving arc contact 23 separates from the stationary arc contact 33 and generates an arc, insulating gas enters the nozzle assembly 10 from the end of the nozzle assembly 10 closest to the moving contact assembly 20 and is blown towards the moving arc contact 23 and the stationary arc contact 33. The insulating gas cools and extinguishes the arc.

[0063] like Figure 1 As shown, the nozzle assembly 10, near the stationary contact assembly 30, has a stationary main contact 32 inserted through it and extends into the interior of the stationary side support assembly 31, where it slides against the inner wall of the stationary side support assembly 31. This end of the nozzle assembly 10 is also sleeved over the stationary arc contact 33. A gas cavity 60 is formed between the moving side support assembly 21 and the fixed assembly 40. The gas cavity 60 communicates with the end of the nozzle assembly 10 near the moving contact assembly 20. When the moving arc contact 23 separates from the stationary arc contact 33 and generates an arc, the volume of the gas cavity 60 is compressed, and the insulating gas within the gas cavity 60 is blown into the nozzle assembly 10. Specifically, the moving side support assembly 21 includes a cylinder body 211, a cylinder seat 212, and an air guide pipe 213. Both ends of the cylinder body 211 have openings. A second flange 422 is provided on one end of the support member 42 facing the stationary contact assembly 30 (i.e., the end located inside the insulating cylinder 50). The second flange 422 is inserted into the cylinder body 211 and slides against the inner wall of the cylinder body 211. The cylinder seat 212 is installed at the other end of the cylinder body 211. The air guide pipe 213 is at least partially located inside the cylinder rod body, with one end fixedly connected to the cylinder seat 212 and the other end extending through the second flange 422 to the outside of the cylinder body 211. The moving main contact 22 and the moving arc contact 23 are both fixedly connected to the cylinder seat 212. Therefore, the cylinder body 211, the support member 42, the cylinder seat 212, and the air guide pipe 213 together form an air cavity 60. A second air hole 2121 is provided on the cylinder seat 212, and the second air hole 2121 communicates with the end of the nozzle assembly 10 near the moving contact assembly 20. A first vent 421 is provided on the fixed component 40 or the moving side support component 21. A one-way valve 70 is installed at the first vent 421. The one-way valve 70 only allows insulating gas to enter the air chamber 60 from the outside under air pressure. In this embodiment, the first vent 421 is provided on the second flange portion 422. In other embodiments, the first vent 421 may also be provided on the cylinder body 211, which is not limited here.

[0064] When the gas-insulated circuit breaker is closed, the moving contact assembly 20 moves closer to the stationary contact assembly 30, the cylinder body 211 moves away from the support member 42, the volume of the gas chamber 60 increases and the air pressure decreases. At this time, the one-way valve 70 opens, and the insulating gas outside the gas chamber 60 can enter the gas chamber 60 through the first air hole 421. At the same time, some insulating gas can also enter the gas chamber 60 through the second air hole 2121. When the gas-insulated circuit breaker is opened or tripped, the moving contact assembly 20 moves away from the stationary contact assembly 30, the cylinder body 211 moves closer to the support member 42, the volume of the gas chamber 60 decreases rapidly, and the pressure inside the gas chamber 60 is greater than the air pressure outside the gas chamber 60. The one-way valve 70 blocks the first air hole 421, and the insulating gas inside the gas chamber 60 is injected into the nozzle assembly 10 through the second air hole 2121 at a relatively fast speed, thereby extinguishing the arc generated between the moving arc contact 23 and the stationary arc contact 33.

[0065] In this embodiment, the air guide pipe 213 is connected to the cylindrical moving arc contact 23. Therefore, during the segmentation process, part of the insulating gas injected into the nozzle assembly 10 can be discharged from the end of the stationary side support assembly 31 away from the moving contact assembly 20, and part can be discharged through the moving arc contact 23 and the air guide pipe 213, thus avoiding excessive gas pressure in the nozzle assembly 10 for a long time.

[0066] In related technologies, some nozzle assemblies are integrally molded. Due to factors such as coaxiality and fitting precision, this integral molding method results in high manufacturing difficulty and cost for the nozzle assemblies. Other nozzle assemblies are split structures, including a main nozzle and an auxiliary nozzle. One end of the main nozzle is fixedly connected to the moving-side support assembly and fitted with a stationary arc contact and a moving arc contact. The auxiliary nozzle is connected to the other end of the main nozzle via a threaded connection for sliding engagement with the stationary-side support assembly. This method can reduce the overall processing cost of the nozzle assembly. However, the applicant found that setting the nozzle assembly as a split structure leads to a decrease in its insulation performance. Under certain circumstances, the nozzle assembly may be broken down by electric arc, causing the circuit breaker to fail to trip, creating a safety hazard.

[0067] In this regard, such as Figures 2-7As shown, the nozzle assembly 10 includes a main nozzle 11 and an auxiliary nozzle 12. Both the main nozzle 11 and the auxiliary nozzle 12 are cylindrical structures and are made of insulating material. The first end of the main nozzle 11 is connected to the moving side support assembly 21, and the outer periphery of the second end is provided with an external thread portion 111 and a first relief groove 112 formed by machining the external thread portion 111. The auxiliary nozzle 12 is sleeved on the second end of the main nozzle 11 and slides in cooperation with the stationary side support assembly 31. The inner wall of the auxiliary nozzle 12 is provided with an internal thread portion 121 and a second relief groove 122 formed by machining the internal thread portion 121. The internal thread portion 121 is threadedly connected to the external thread portion 111. The nozzle assembly 10 also includes a connecting structure 120, which extends through the auxiliary nozzle 12. The first relief groove 112 and the second relief groove 122 are both connected to the connecting structure 120.

[0068] The applicant discovered that the main reason for the decreased insulation performance and susceptibility to electrical breakdown in the nozzle assembly 10, which is designed as a split-molding scheme, is that after the auxiliary nozzle 12 is threaded onto the main nozzle 11, a closed cavity is formed at the first relief groove 112 formed when machining the external thread 111 and the second relief groove 122 formed when machining the external thread 111. This closed cavity contains air, and the air cannot be extracted from the closed cavity during the vacuuming process of the gas-insulated circuit breaker assembly, thus the air remains in the nozzle assembly 10, thereby reducing the insulation performance of the nozzle assembly 10. In this embodiment, by providing a connecting structure 120 on the nozzle assembly, and having the connecting structure 120 penetrate the auxiliary nozzle 12, and with both the first and second retraction grooves 112 and 122 connected to the connecting structure 120, a closed space can be avoided between the auxiliary nozzle 12 and the main nozzle 11. Therefore, during the vacuuming stage of the gas-insulated circuit breaker assembly process, the air in the first and second retraction grooves 112 and 122 can be discharged through the connecting structure 120, and during the filling of insulating gas... The first and second retraction grooves 112 and 122 can be filled with insulating gas, thus eliminating the storage of air inside the nozzle assembly 10. This improves the insulation of the nozzle assembly 10, prevents the nozzle assembly 10 from being broken down by electric arc during the breaking process between the moving contact assembly 20 and the stationary contact assembly 30, and prevents high-voltage breakdown between the moving contact assembly 20 and the stationary contact assembly 30 after breaking. This ensures the insulation performance of the break between the moving contact assembly 20 and the stationary contact assembly 30, thereby ensuring the reliability of the circuit breaker breaking.

[0069] like Figure 3 As shown, along the axial direction of the nozzle assembly 10, the first relief groove 112 and the second relief groove 122 are located on both sides of the external thread portion 111. Specifically, the first relief groove 112 is located on the side of the external thread portion 111 near the first end of the main nozzle 11, and the second relief groove 122 is located on the side of the internal thread portion 121 near the second end of the main nozzle 11. Figure 1 , Figure 4 and Figure 5 As shown, a third flange portion 114 is provided at the first end of the main nozzle 11, and a hook portion 231 extends inward from the free end of the moving main contact 22. The hook portion 231 hooks onto the third flange portion 114, thereby simultaneously fixing the main nozzle 11 during the installation of the moving main contact 22 onto the moving side support assembly 21. The structure is simple and the installation is convenient. In addition, the end face of the main nozzle 11 abuts against the cylinder seat 212, so that the second air hole 2121 on the cylinder seat 212 is opposite to the opening at the first end of the main nozzle 11, thereby realizing the communication between the air chamber 60 and the nozzle assembly 10.

[0070] like Figure 1 , Figure 6 and Figure 7 As shown, a fourth flange 128 is provided at the end of the auxiliary nozzle 12 furthest from the moving contact assembly 20. The outer peripheral surface of the fourth flange 128 is used for sliding engagement with the inner wall of the stationary support assembly 31. Providing the fourth flange 128 reduces the area of ​​the machined surface of the auxiliary nozzle 12, thereby reducing its manufacturing cost. A groove 129 is provided on the outer periphery of the fourth flange 128, and a guide ring 13 is provided within the groove 129. The guide ring 13 slides in engagement with the inner wall of the stationary support assembly 31. The guide ring 13 improves the fitting accuracy and sealing performance between the nozzle assembly 10 and the stationary support assembly 31, preventing the insulating gas ejected from the nozzle assembly 10 from reaching the stationary main contact 32 through the gap between the auxiliary nozzle 12 and the inner support member 42 when the moving arc contact 23 and the stationary arc contact 33 are disconnected. Figure 7 As shown, the auxiliary nozzle 12 is provided with a protrusion 1281 at one end of the fourth flange 128. The protrusion 1281 abuts against the end face of the main nozzle 11, thereby positioning the main nozzle 11 and the auxiliary nozzle 12 to ensure that they are installed in place.

[0071] like Figure 3 and Figure 6As shown, the connecting structure 120 includes a connecting hole 123 and a first groove 124. The connecting hole 123 is disposed on and penetrates the auxiliary nozzle 12. The inner wall of the auxiliary nozzle 12 is provided with the first groove 124, and the first groove 124 penetrates the internal thread portion 121 along the axial direction of the auxiliary nozzle 12 to connect the first relief groove 112 and the second relief groove 122. The first relief groove 112, the second relief groove 122, or the first groove 123 communicates with the connecting hole 123. With this arrangement, it is not necessary to open holes penetrating the inner wall of the auxiliary nozzle 12 for the first relief groove 112 and the second relief groove 122, which can reduce the number of openings on the auxiliary nozzle 12 and help ensure the structural strength of the auxiliary nozzle 12. In this embodiment, the connecting hole 123 is opened in the region of the auxiliary nozzle 12 near the first end of the main nozzle 11, and the connecting hole 123 communicates with the first relief groove 112. In some embodiments, the connecting hole 123 may also be formed in the region of the auxiliary nozzle 12 near the second end of the main nozzle 11, and the connecting hole 123 communicates with the second relief groove 122. In other embodiments, the connecting hole 123 may also be formed in the middle region of the auxiliary nozzle 12 along the axial direction, and the connecting hole 123 communicates with the first cutting groove 122. In this embodiment, the auxiliary nozzle 12 is provided with a plurality of connecting holes 123, which are arranged at intervals along the circumference of the first relief groove 112. Each connecting hole 123 communicates with the first relief groove 112. This arrangement facilitates more thorough extraction of air from the first relief groove 112 and the second relief groove 122, and facilitates the filling of insulating gas into the first relief groove 112 and the second relief groove 122.

[0072] In another embodiment (not shown), a first groove 124 is provided on the outer wall of the main nozzle 11. The first groove 124 penetrates the external threaded portion 111 along the axial direction of the main nozzle 11 to connect the first relief groove 112 and the second relief groove 122. The first relief groove 112, the second relief groove 122, or the first groove 124 communicates with the connecting hole 123. Providing the first groove 124 on the main nozzle 11 can also reduce the number of connecting holes 123 on the auxiliary nozzle 12 and improve the structural strength of the auxiliary nozzle 12. In some embodiments, the first groove 124 can also be provided on both the outer wall of the main nozzle 11 and the inner wall of the auxiliary nozzle 12, ensuring that the first groove 124 connects the first relief groove 112 and the second relief groove 122.

[0073] Based on the reciprocating motion of the auxiliary nozzle 12 relative to the stationary side support assembly 31, the simple threaded connection between the main nozzle 11 and the auxiliary nozzle 12 results in poor installation reliability of the auxiliary nozzle 12. In some cases, the auxiliary nozzle 12 may fall off from the main nozzle 11 under the action of the sprayed insulating air.

[0074] In this regard, such as Figures 3-7As shown, a locking protrusion 113 is provided on the outer wall of the main nozzle 11, located on the side of the external thread portion 111 near the first end of the main nozzle 11. A hook 125 is provided at the end of the auxiliary nozzle 12 near the first end of the main nozzle 11. The end of the external thread portion 111 is elastically deformable so that when the auxiliary nozzle 12 is fitted onto the second end of the main nozzle 11, the hook 125 can pass over the locking protrusion 113 and hook onto it. In this embodiment, the hook 125 on the auxiliary nozzle 12 and the locking protrusion 113 on the main nozzle 11 form a barbed engagement, greatly improving the reliability of the connection between the main nozzle 11 and the auxiliary nozzle 12. In this embodiment, the hook 125 is formed by the free end of the auxiliary nozzle 12 near the first end of the main nozzle 11 protruding radially inward.

[0075] like Figure 6 and Figure 7 As shown, the auxiliary nozzle 12 has a plurality of second grooves 126 at its first end near the main nozzle 11. These second grooves 126 are spaced apart circumferentially along the auxiliary nozzle 12, and an elastic deformation portion 127 is located between adjacent second grooves 126. A hook 125 is provided at the free end of each elastic deformation portion 127. By providing the second grooves 126, the elastic deformation capability of the end of the auxiliary nozzle 12 is increased, thereby facilitating the hook 125 to pass over and hook onto the protrusion 113. In this embodiment, the plurality of second grooves 126 on the auxiliary nozzle 12 are evenly arranged circumferentially along the auxiliary nozzle 12, thereby ensuring uniform circumferential strength of the auxiliary nozzle 12 and a stable and reliable connection with the main nozzle 11.

[0076] like Figure 3 , Figure 6 and Figure 7 As shown, at least a portion of the second groove 126 forms a connecting hole 123 and communicates with the first relief groove 112. The second relief groove 122 communicates with the first relief groove 112 through the first groove 124. In other words, in this embodiment, the second groove 126 not only increases the elastic deformation capability of the end of the auxiliary nozzle 12, allowing the hook 125 and the protrusion 113 to engage more smoothly, but also facilitates communication between the first relief groove 112 and the outside of the nozzle assembly 10, reducing the number of openings on the auxiliary nozzle 12. This simplifies the structure of the auxiliary nozzle 12 and ensures sufficient structural strength. In this embodiment, the connecting hole 123 is located at the end of the second groove 126 opposite to the free end of the auxiliary nozzle 12. The diameter of the connecting hole 123 is larger than the width of the remaining parts of the second groove 126, which not only facilitates the air discharge and filling of insulating gas within the first and second relief grooves 112 and 122, but also enhances the elastic deformation capability of the elastic deformation portion 127.

[0077] like Figure 3As shown, the latching protrusion 113 includes a first stop surface 1131, which is perpendicular to the axial direction of the main nozzle 11 and faces the first end of the main nozzle 11. The latching hook 125 includes a second stop surface 1251, which is perpendicular to the axial direction of the main nozzle 11 and faces the second end of the main nozzle 11. The first stop surface 1131 and the second stop surface 1251 abut against each other. By setting the first stop surface 1131 of the latching protrusion 113 and the second stop surface 1251 of the latching hook 125 as surfaces perpendicular to the axial direction of the nozzle assembly 10 and abutting against each other, the two can be reliably hooked together, while preventing them from slipping and disengaging due to vibration or other factors during the movement of the follower contact assembly 20. This improves the connection reliability between the main nozzle 11 and the auxiliary nozzle 12, thereby increasing the service life of the gas-insulated circuit breaker.

[0078] like Figure 3 As shown, the latching protrusion 113 further includes a first guide surface 1132, which is disposed on the side of the first stop surface 1131 facing the second end of the main nozzle 11. The first guide surface 1132 is inclined relative to the axial direction of the main nozzle 11 and is used to guide the latch 125 over the latching protrusion 113 during assembly. The latch 125 further includes a second guide surface 1252, which is disposed on the side of the second guide surface 1252 facing the first end of the main nozzle 11. The second guide surface 1252 is inclined relative to the axial direction of the main nozzle 11 and is used to allow the latch 125 to over the latching protrusion 113 during assembly.

[0079] When assembling the main nozzle 11 and the auxiliary nozzle 12, the auxiliary nozzle 12 is rotated so that the internal thread 121 of the auxiliary nozzle 12 gradually engages with the external thread 111. When the hook 125 reaches the protrusion 113, the second guide surface 1252 first contacts the first guide surface 1132. The engagement of the two inclined surfaces allows the end of the auxiliary nozzle 12 (i.e., the elastic deformation part 127) to be subjected to radial extrusion force. The end of the auxiliary nozzle 12 gradually expands radially to pass over the protrusion 113, ensuring the smooth installation of the auxiliary nozzle. After the second guide surface 1252 passes over the first stop surface 1131, the protrusion 113 no longer applies radial force to the end of the auxiliary nozzle 12. The end of the auxiliary nozzle 12 recovers its elastic deformation, and the first stop surface 1131 and the second stop surface 1251 fit together and abut against each other, realizing the hook connection between the hook 125 and the protrusion 113. It is understood that in some embodiments, the first guide surface 1132 may be provided only on the protrusion 113, or the second guide surface 1252 may be provided only on the hook 125, and no limitation is made here.

[0080] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. For those skilled in the art, based on the concept of this utility model, there will be changes in the specific implementation methods and application scope. The content of this specification should not be construed as a limitation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A nozzle assembly for use in a gas-insulated circuit breaker, characterized in that, The nozzle assembly includes: The main nozzle (11) is made of insulating material. The first end of the main nozzle (11) is configured to be connected to the moving side support assembly (21) of the gas-insulated circuit breaker, and the outer periphery of the second end is provided with an external thread (111) and a first unscrew groove (112). An auxiliary nozzle (12), made of insulating material, is sleeved on the second end of the main nozzle (11) and is used to slide with the stationary side support assembly (31) of the gas-insulated circuit breaker. The inner wall of the auxiliary nozzle (12) is provided with an internal thread (121) and a second relief groove (122). The internal thread (121) is threadedly connected to the external thread (111). The nozzle assembly is provided with a connecting structure (120), which extends through the auxiliary nozzle (12), and the first retraction groove (112) and the second retraction groove (122) are both connected to the connecting structure (120).

2. The nozzle assembly as claimed in claim 1, characterized in that, Along the axial direction of the auxiliary nozzle (12), the first relief groove (112) and the second relief groove (122) are respectively located on both sides of the internal thread portion (121). The connecting structure (120) includes a connecting hole (123) and a first cutting groove (124). The connecting hole (123) is disposed on the auxiliary nozzle (12) and penetrates the auxiliary nozzle (12). The inner wall of the auxiliary nozzle (12) is provided with the first groove (124), which penetrates the internal thread (121) along the axial direction of the auxiliary nozzle (12) to connect the first relief groove (112) and the second relief groove (122). The first relief groove (112), the second relief groove (122), or the first groove (124) communicates with the connecting hole (123); and / or The outer wall of the main nozzle (11) is provided with the first cutting groove (124), which penetrates the external threaded portion (111) along the axial direction of the main nozzle (11) to connect the first unloading groove (112) and the second unloading groove (122). The first unloading groove (112) or the second unloading groove (122) or the first cutting groove (124) is connected to the connecting hole (123).

3. The nozzle assembly as described in claim 1 or 2, characterized in that, A locking protrusion (113) is provided on the outer wall of the main nozzle (11), and the locking protrusion (113) is located on the side of the external threaded portion (111) near the first end of the main nozzle (11). The auxiliary nozzle (12) is provided with a hook (125) at the end near the first end of the main nozzle (11). The end of the auxiliary nozzle (12) can be elastically deformed so that when the auxiliary nozzle (12) is sleeved on the second end of the main nozzle (11), the hook (125) can pass over the protrusion (113) and hook with the protrusion (113).

4. The nozzle assembly as described in claim 3, characterized in that, The auxiliary nozzle (12) is provided with a plurality of second grooves (126) at the end near the first end of the main nozzle (11). The plurality of second grooves (126) are arranged at intervals along the circumference of the auxiliary nozzle (12). An elastic deformation portion (127) is provided between adjacent second grooves (126), and the hook (125) is provided at the free end of the elastic deformation portion (127).

5. The nozzle assembly as described in claim 4, characterized in that, The connecting structure (120) includes a connecting hole (123) and a first groove (124). The connecting hole (123) is disposed on the auxiliary nozzle (12) and passes through the auxiliary nozzle (12). The first groove (124) is disposed on the main nozzle (11) or the auxiliary nozzle (12) and connects the first retraction groove (112) and the second retraction groove (122). The first relief groove (112) is disposed on one side of the external thread portion (111) near the first end of the main nozzle (11), and at least part of the second groove (126) forms the connecting hole (123) and communicates with the first relief groove (112).

6. The nozzle assembly as described in claim 3, characterized in that, The protrusion (113) includes a first stop surface (1131), which is perpendicular to the axial direction of the main nozzle (11) and faces the first end of the main nozzle (11). The hook (125) includes a second stop surface (1251), which is perpendicular to the axial direction of the main nozzle (11) and faces the second end of the main nozzle (11). The first stop surface (1131) abuts against the second stop surface (1251).

7. The nozzle assembly as claimed in claim 6, characterized in that, The latch (113) further includes a first guide surface (1132), which is disposed on one side of the first stop surface (1131) facing the second end of the main nozzle (11). The first guide surface (1132) is inclined relative to the axial direction of the main nozzle (11) and is used to guide the latch (125) over the latch (113) during assembly; and / or The hook (125) further includes a second guide surface (1252), which is disposed on one side of the second guide surface (1252) facing the first end of the main nozzle (11). The second guide surface (1252) is inclined relative to the axial direction of the main nozzle (11) and is used to allow the hook (125) to pass over the hook protrusion (113) during assembly.

8. A gas-insulated circuit breaker, characterized in that, Including the nozzle assembly according to any one of claims 1-7, further comprising: The moving contact assembly (20) includes a moving side support assembly (21), a moving main contact (22), and a moving arc contact (23). The moving main contact (22) and the moving arc contact (23) are both mounted on the moving side support assembly (21). The first end of the main nozzle (11) is connected to the moving side support assembly (21). The moving arc contact (23) is disposed inside the nozzle assembly, and the moving main contact (22) is disposed outside the nozzle assembly. The stationary contact assembly (30) includes a stationary side support assembly (31), a stationary main contact (32), and a stationary arc contact (33). The stationary main contact (32) and the stationary arc contact (33) are both mounted on the stationary side support assembly (31). The auxiliary nozzle (12) is slidably engaged with the stationary side support assembly (31). The stationary arc contact (33) extends at least partially into the nozzle assembly. The stationary main contact (32) is located outside the nozzle assembly. When the moving contact assembly (20) is separated from the stationary contact assembly (30), insulating gas enters from the first end of the main nozzle (11) and is blown toward the moving arc contact (23) and the stationary arc contact (33).

9. The gas-insulated circuit breaker as described in claim 8, characterized in that, The gas-insulated circuit breaker further includes a fixed component (40), and a gas cavity (60) is formed between the moving side support component (21) and the fixed component (40), and the gas cavity (60) is connected to the first end of the main nozzle (11); When the moving contact assembly (20) moves away from the stationary contact assembly (30), the volume of the air chamber (60) decreases, and the insulating gas in the air chamber (60) is blown into the main nozzle (11).

10. The gas-insulated circuit breaker as described in claim 9, characterized in that, A first air hole (421) is provided on the fixed component (40) or the moving side support component (21). A one-way valve (70) is installed at the first air hole (421). When the moving contact component (20) is away from the stationary contact component (30), the one-way valve (70) is closed; when the moving contact component (20) is close to the stationary contact component (30), the one-way valve (70) is opened, and the volume of the air chamber (60) increases.

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