A quick grounding switch with air blowing arc extinguishing function and switch equipment
By designing an air-blowing arc-extinguishing function in the fast grounding switch, the piston component sprays air to extinguish the arc and quickly discharges the hot air, solving the problem of excessively long arcing time in traditional equipment and improving insulation performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG MINGYANG ELECTRIC CO LTD
- Filing Date
- 2025-06-13
- Publication Date
- 2026-07-21
Smart Images
Figure CN224536907U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of gas-insulated metal-enclosed switchgear, and in particular to a fast grounding switch and switchgear with an air-blowing arc-extinguishing function. Background Technology
[0002] With social development and continuous advancements in science and technology, the technology of switchgear used in power systems has become increasingly mature. Among them, gas-insulated metal-enclosed switchgear is a commonly used electrical device in power systems.
[0003] Traditional gas-insulated metal-enclosed switchgear typically uses sulfur hexafluoride (SF6) gas as the insulation and breaking medium. SF6 gas is the most potent greenhouse gas, restricted by international conventions, and is a major factor contributing to global warming.
[0004] Therefore, more and more companies are researching insulated metal-enclosed switchgear using dry air as the insulating medium. However, the insulating performance of dry air is only one-third that of sulfur hexafluoride gas under the same pressure. When the fast grounding switch of the insulated metal-enclosed switchgear is opened, the arcing time between the stationary arc contact and the moving arc contact is too long, causing contact erosion and affecting the insulation performance of the insulated metal-enclosed switchgear. Utility Model Content
[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, the first aspect of this invention proposes a fast grounding switch with an air-blowing arc-extinguishing function, which can quickly extinguish the arc between the stationary and moving arc contacts during opening, shortening the time for arc occurrence and preventing the stationary and moving arc contacts from being burned. The second aspect of this invention provides a switching device using the aforementioned fast grounding switch with an air-blowing arc-extinguishing function, which improves the insulation performance of the switching device.
[0006] A fast grounding switch with an air-blowing arc-extinguishing function according to a first aspect embodiment of the present invention includes a base, a stationary contact assembly, a moving contact assembly, and a driving mechanism. The stationary contact assembly includes a stationary contact seat, an annular contact member, and a stationary arc contact. The stationary contact seat is disposed on the base, and the annular contact member and the stationary arc contact are disposed on the same side of the stationary contact seat. The annular contact member is sleeved on the outer periphery of the stationary arc contact. A first annular cavity is formed between the outer peripheral wall of the stationary arc contact and the inner peripheral wall of the annular contact member. The side wall of the annular contact member... The moving contact assembly includes a moving contact member, a piston rod, and a moving arc contact. The piston rod is located on one side of the stationary contact assembly. The first end of the piston rod is fixedly disposed on the base, and the second end of the piston rod faces the annular contact member. The moving contact member is movably sleeved on the outer periphery of the piston rod. The moving contact member has a receiving cavity inside. The end of the moving contact member facing the annular contact member has an opening that communicates with the receiving cavity. The second end of the piston rod has a notch that can connect with the receiving cavity. A piston component that contacts the inner peripheral wall of the cavity, wherein the moving arc contact is disposed at one end of the moving contact component facing the annular contact component; a driving mechanism is disposed on the base, the driving mechanism being pulsatorically connected to the moving contact component, the driving mechanism being capable of driving the moving contact component to move the moving arc contact along the axial direction of the piston rod towards or away from the annular contact component; the driving mechanism driving the moving contact component to move the moving arc contact closer to the annular contact component and causing the moving contact component to insert into the annular contact component, the moving contact component and the stationary piston rod... When the arc contacts are inserted, the piston is located at the end of the receiving cavity away from the annular contact; the driving mechanism drives the moving contact to move the moving arc contact away from the annular contact and separate the moving contact from the annular contact. During the process of the moving contact and the stationary arc contact separating from each other, the piston moves from the end of the receiving cavity away from the annular contact to the other end of the receiving cavity closer to the annular contact. The piston can push the air inside the receiving cavity to be sprayed toward the stationary contact assembly.
[0007] A fast grounding switch with air-blowing arc-extinguishing function according to an embodiment of the present invention has at least the following beneficial effects:
[0008] This embodiment of a fast grounding switch with an air-blowing arc-extinguishing function has a receiving cavity inside the moving contact. The moving contact has an opening at one end facing the annular contact that communicates with the receiving cavity. The second end of the piston rod has a piston that can contact the inner wall of the receiving cavity. Therefore, when the driving mechanism drives the moving contact to move the moving arc contact away from the annular contact, separating the moving contact from the annular contact and separating the moving contact from the stationary arc contact, the moving contact moves axially along the piston rod away from the annular contact. This causes the piston to move from the end of the receiving cavity away from the annular contact to the other end of the receiving cavity closer to the annular contact. At this time, the piston can push the air inside the receiving cavity. The air is sprayed towards the stationary contact assembly, so the air sprayed from the opening at the end of the moving contact can extinguish the arc between the stationary and moving arc contacts, shorten the time of arc occurrence, prevent the stationary and moving arc contacts from being burned, and help protect the stationary and moving contact assemblies. At the same time, the side wall of the annular contact has a notch that communicates with the first annular cavity. Therefore, after the air sprayed from the opening at the end of the moving contact is burned into hot air, the hot air can be quickly discharged outward from the notch on the side wall of the annular contact. This helps to discharge the hot air between the stationary and moving arc contacts, helps to restore the insulation performance of the gas between the stationary and moving arc contacts, and improves the insulation performance of the fast grounding switch in this embodiment.
[0009] In some embodiments of the first aspect of this utility model, the annular contact member has a plurality of notches on its sidewall, and the plurality of notches are evenly arranged at intervals along the circumference of the annular contact member.
[0010] In some embodiments of the first aspect of this utility model, the annular contact member is formed by a plurality of independent metal contact fingers joined together, all of the metal contact fingers are arranged at intervals along the outer periphery of the stationary arc contact on the stationary contact seat, and there is a notch between two adjacent metal contact fingers.
[0011] In some embodiments of the first aspect of this utility model, the stationary contact seat is provided with an annular positioning member arranged around the outer periphery of the stationary arc contact. A contact kit is sleeved on the outer periphery of the annular positioning member. The contact kit is fixedly disposed on the stationary contact seat. A second annular cavity is provided between the contact kit and the annular positioning member. All the metal fingers of the annular contact are movably mounted in the second annular cavity. All the metal fingers are arranged sequentially at intervals around the outer periphery of the annular positioning member. All the metal fingers have a protrusion that protrudes outside the second annular cavity and extends toward the stationary arc contact. An elastic member is provided between each metal finger and the contact kit. One end of the elastic member abuts against the contact kit, and the other end of the elastic member abuts against the inner wall of the contact kit.
[0012] In some embodiments of the first aspect of this utility model, each of the metal contact fingers has a mounting groove on one side surface facing the inner wall of the contact kit, one end of the elastic member is embedded in the mounting groove, and the other end of the elastic member abuts against the inner wall of the contact kit.
[0013] In some embodiments of the first aspect of this utility model, the sidewall of the contact assembly is provided with an exhaust hole.
[0014] In some embodiments of the first aspect of this utility model, the stationary contact seat is provided with an isolation cover that covers the outer periphery of the contact assembly, and the end of the isolation cover is provided with a clearance hole that can be adapted to the moving contact.
[0015] In some embodiments of the first aspect of this utility model, the moving contact assembly includes an air nozzle, which is disposed at one end of the moving contact member facing the annular contact member. The air nozzle is sleeved on the outer periphery of the moving arc contact, and an air blowing channel is provided between the air nozzle and the moving arc contact. The air blowing channel is connected to the receiving cavity.
[0016] In some embodiments of the first aspect of this utility model, the air nozzle has a circular channel arranged along the length direction of the moving arc contact, and the diameter of the circular channel gradually decreases from the end of the air nozzle away from the annular contact member to the end of the air nozzle closer to the annular contact member.
[0017] According to a second aspect of the present invention, a switchgear includes a switchgear body, wherein the switchgear body is equipped with a fast grounding switch having an air-blowing arc-extinguishing function as described above.
[0018] The switching device according to the embodiments of the present utility model has at least the following beneficial effects:
[0019] The switchgear of this embodiment employs the aforementioned fast grounding switch, which allows air to be ejected from the opening at the end of the moving contact when the switch is opened, extinguishing the arc between the stationary and moving arc contacts. This shortens the time for the arc to occur, prevents the stationary and moving arc contacts from being burned, and helps protect the stationary and moving contact assemblies. At the same time, the notch in the side wall of the annular contact helps to discharge the hot air between the stationary and moving arc contacts, thereby shortening the insulation recovery time of the gas between the stationary and moving arc contacts and improving the insulation performance of the switchgear of this embodiment. Attached Figure Description
[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0021] Figure 1This is a schematic diagram of the structure of a fast grounding switch with air blowing arc extinguishing function according to certain embodiments of the present invention;
[0022] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the internal structure of a fast grounding switch with an air-blowing arc-extinguishing function.
[0023] Figure 3 for Figure 1 The diagram shows a cross-sectional view of the stationary contact assembly and the moving contact assembly of a fast grounding switch with air blowing arc extinguishing function when they are in the closed position.
[0024] Figure 4 for Figure 1 The diagram shows a cross-sectional view of the stationary contact assembly and moving contact assembly of a fast grounding switch with air-blowing arc-extinguishing function when the switch is open.
[0025] Figure 5 for Figure 1 A cross-sectional view of the assembly structure of the moving contact, the moving arc contact, and the air blowing nozzle of a fast grounding switch with air blowing arc extinguishing function is shown.
[0026] Figure 6 for Figure 1 An exploded cross-sectional view of the moving contact, the moving arc contact, and the blowing nozzle of a fast grounding switch with an air blowing arc extinguishing function is shown.
[0027] Figure 7 for Figure 1 An exploded view of the static contact assembly of a fast grounding switch with air-blowing arc-extinguishing function is shown.
[0028] Figure 8 for Figure 1 A structural cross-sectional view of the stationary contact assembly of a fast grounding switch with air-blowing arc-extinguishing function is shown.
[0029] Figure 9 for Figure 3 Enlarged view of point A in the middle;
[0030] Figure 10 for Figure 4 Enlarged diagram of point B in the middle. Detailed Implementation
[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0032] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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.
[0033] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0034] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0035] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0036] Reference Figures 1 to 10 and mainly refer to Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 8 , Figure 9 and Figure 10According to certain embodiments of the first aspect of this utility model, a fast grounding switch with an air-blowing arc-extinguishing function is provided, hereinafter sometimes simply referred to as a "fast grounding switch". A fast grounding switch with an air-blowing arc-extinguishing function includes a base 100, a stationary contact assembly 200, a moving contact assembly 300, and a drive mechanism. In this embodiment, the base 100 is a hollow housing, and the stationary contact assembly 200, the moving contact assembly 300, and the drive mechanism are all disposed inside the housing. The stationary contact assembly 200 is located on the front side of the housing, and the moving contact assembly 300 is located on the rear side of the housing. The stationary contact assembly 200 includes a stationary contact seat 210, an annular contact member 220, and a stationary arc contact 230. The stationary contact seat 210 is fixedly installed on the base 100. The annular contact member 220 and the stationary arc contact 230 are disposed on the same side of the stationary contact seat 210. The annular contact member 220 is sleeved on the outer periphery of the stationary arc contact 230. A first annular cavity 240 is formed between the outer peripheral wall of the stationary arc contact 230 and the inner peripheral wall of the annular contact member 220. A notch 221 communicating with the first annular cavity 240 is provided on the side wall of the annular contact member 220. The moving contact assembly 300 includes a moving contact 310, a piston rod 320, and a moving arc contact 330. The piston rod 320 is located on the rear side of the stationary contact assembly 200. The first end of the piston rod 320 is fixedly disposed on the base 100, and the second end of the piston rod 320 faces the annular contact 220. The moving contact 310 has a receiving cavity 311 inside. The moving contact 310 is movably sleeved on the outer periphery of the piston rod 320. The end of the moving contact 310 facing the annular contact 220 has an opening 312 that communicates with the receiving cavity 311. The second end of the piston rod 320 is provided with a piston 321 that can contact the inner peripheral wall of the receiving cavity 311. In this example, the first end of the piston rod 320 refers to the end of the piston rod 320 away from the annular contact 220, and the second end of the piston rod 320 refers to the end of the piston rod 320 close to the annular contact 220. The moving arc contact 330 is disposed at one end of the moving contact 310 facing the annular contact 220. The drive mechanism is disposed on the rear side of the base 100 and is connected to the moving contact 310 in a transmission manner. The drive mechanism can drive the moving contact 310 to move the moving arc contact 330 along the axial direction of the piston rod 320 to move closer to or away from the annular contact 220.When the driving mechanism drives the moving contact 310 to move the moving arc contact 330 closer to the annular contact 220 and inserts the moving contact 310 into the annular contact 220, and when the moving contact 310 and the stationary arc contact 230 are inserted, the piston 321 is located at the end of the receiving cavity 311 away from the annular contact 220. When the driving mechanism drives the moving contact 310 to move the moving arc contact 330 away from the annular contact 220 and separates the moving contact 310 from the annular contact 220, during the process of the moving contact 310 and the stationary arc contact 230 separating, the piston 321 moves from the end of the receiving cavity 311 away from the annular contact 220 to the other end of the receiving cavity 311 closer to the annular contact 220. The piston 321 can push the air inside the receiving cavity 311 to be sprayed toward the stationary contact assembly 200.
[0037] In this embodiment, the fast grounding switch has a receiving cavity 311 inside the moving contact 310. One end of the moving contact 310 facing the annular contact 220 has an opening 312 communicating with the receiving cavity 311. The second end of the piston rod 320 has a piston 321 that can contact the inner peripheral wall of the receiving cavity 311. Therefore, when the driving mechanism drives the moving contact 310 to move the moving arc contact 330 away from the annular contact 220, causing the moving contact 310 to separate from the annular contact 220 and the moving contact 330 to separate from the stationary arc contact 230, the moving contact 310 moves axially along the piston rod 320 away from the annular contact 220. Consequently, the piston 321 moves from one end of the receiving cavity 311 away from the annular contact 220 towards the other end of the receiving cavity 311 closer to the annular contact 220. At this time, the piston 321 can push the contents of the receiving cavity 311... Air is sprayed towards the stationary contact assembly 200, so the air sprayed from the opening 312 at the end of the moving contact 310 can extinguish the arc between the stationary arc contact 230 and the moving arc contact 330, shorten the time of arc occurrence, and prevent the stationary arc contact 230 and the moving arc contact 330 from being burned. This helps to protect the stationary contact assembly 200 and the moving contact assembly 300. At the same time, the side wall of the annular contact 220 has a notch 221 that communicates with the first annular cavity 240. Therefore, after the air sprayed from the opening 312 at the end of the moving contact 310 is burned into hot air, the hot air can be quickly discharged outward from the notch 221 on the side wall of the annular contact 220. This helps to discharge the hot air between the stationary arc contact 230 and the moving arc contact 330, and helps to restore the insulation performance of the gas between the stationary arc contact 230 and the moving arc contact 330, thereby improving the insulation performance of the fast grounding switch in this embodiment.
[0038] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4To simplify the structure of the fast grounding switch of this utility model, in some embodiments of this utility model, the driving mechanism includes a connecting seat 410, a swing rod 420, and a rotating rod 430. The connecting seat 410 is fixedly installed on the end of the moving contact 310 away from the annular contact 220. A sliding engagement groove 411 is provided on the side wall of the connecting seat 410. The rotating rod 430 is rotatably installed on the base 100. One end of the swing rod 420 is fixedly installed on the rotating rod 430, and a sliding member is rotatably installed on the other end of the swing rod 420. The sliding member is embedded in the sliding engagement groove 411. When the user applies force to the rotating rod 430, causing the rotating rod 430 to drive the swing rod 420 to swing forward or backward, the swing rod 420, through the cooperation of the sliding member and the sliding locking groove 411, drives the connecting seat 410 to move the moving contact member 310 closer to or away from the annular contact member 220. By adopting the above structure, the structure of the drive mechanism can be made simpler, thereby simplifying the structure of the fast grounding switch of this utility model and facilitating the production and manufacturing of the fast grounding switch.
[0039] It should be noted that in the above embodiments, the drive mechanism adopts a structure consisting of a connecting seat 410, a swing rod 420, and a rotating rod 430. However, in other embodiments of this utility model, the drive mechanism can also adopt other different structures. For example, the drive mechanism is a screw mechanism consisting of a screw and a nut. The screw is rotatably mounted on the base 100 and located on one side of the piston rod 320. The screw and the piston rod 320 are parallel to each other. The nut is threadedly connected to the outer circumference of the screw and is connected to the end of the moving contact 310 away from the annular contact 220. The screw can only rotate relative to the base 100 and cannot move relative to the base 100. For example, if the base 100 has a rotating hole, the screw can be movably inserted through the rotating hole. The screw is equipped with snap rings located on both sides of the rotating hole. The two snap rings are engaged with the side wall of the base 100, so that the screw can only rotate relative to the base 100 and cannot move relative to the base 100. When the user turns the screw forward or backward, the nut drives the moving contact 310 to move along the axial direction of the screw, approaching or moving away from the annular contact 220. Of course, other structures can also be used for the drive mechanism, depending on the actual needs.
[0040] Reference Figure 7 and Figure 8To improve the ability of the fast grounding switch of this invention to discharge hot air, in some embodiments of this invention, the annular contact 220 has multiple notches 221 on its side wall, and the multiple notches 221 are evenly spaced along the circumference of the annular contact 220. By adopting the above structure, the air ejected from the opening 312 at the end of the moving contact 310 is burned into hot air, which can then be quickly discharged outwards through the multiple notches 221 on the side wall of the annular contact 220. This greatly improves the hot air discharge speed between the stationary arc contact 230 and the moving arc contact 330, further enhancing the speed of insulation recovery of the gas between the stationary arc contact 230 and the moving arc contact 330, and improving the insulation performance of the fast grounding switch of this embodiment.
[0041] In some embodiments of this invention, the annular contact member 220 is formed by a plurality of independent metal fingers 2201 joined together. All the metal fingers 2201 are arranged at intervals along the outer periphery of the stationary arc contact 230 on the stationary contact seat 210, and there is a notch 221 between two adjacent metal fingers 2201. By adopting the above structure, a metal finger 2201 can be replaced individually after it is damaged, which helps to reduce maintenance costs, without having to replace the entire annular contact member 220.
[0042] In some embodiments of this utility model, the stationary contact base 210 is provided with an annular positioning member 211 arranged around the outer periphery of the stationary arc contact 230. A contact assembly 250 is sleeved on the outer periphery of the annular positioning member 211. The contact assembly 250 is fixedly disposed on the stationary contact base 210. A second annular cavity 260 is provided between the contact assembly 250 and the annular positioning member 211. All the metal fingers 2201 of the annular contact member 220 are movably installed in the second annular cavity 260. All the metal fingers 2201 are arranged sequentially and at intervals around the outer periphery of the annular positioning member 211. All the metal fingers 2201 have a protrusion 2203 that protrudes outside the second annular cavity 260 and extends toward the stationary arc contact 230. An elastic member is provided between each metal finger 2201 and the contact assembly 250. The elastic member is a compression spring or a spring pin. One end of the elastic member abuts against the contact assembly 250, and the other end of the elastic member abuts against the inner wall of the contact assembly 250. By adopting the above method, the protrusions 2203 of all metal contact fingers 2201 are enclosed to form an annular abutment protruding outside the second annular cavity 260. When the driving mechanism drives the moving contact 310 to move the moving arc contact 330 closer to the annular contact 220 and the moving contact 310 is inserted into the annular contact 220, and the moving contact 310 and the stationary arc contact 230 are inserted into each other, the annular abutment can be tightly attached to the moving contact 310, thereby making the connection between the moving contact 310 and the annular contact 220 more compact and ensuring reliable conductivity between the two.
[0043] In some embodiments of this invention, each metal finger 2201 has a mounting groove 2202 on one side of its surface facing the inner wall of the contact assembly 250. One end of the elastic element is embedded in the mounting groove 2202, and the other end of the elastic element abuts against the inner wall of the contact assembly 250. By adopting the above structure, each elastic element can be positioned and installed on the corresponding metal finger 2201, preventing the elastic element from shifting and ensuring that the elastic element can accurately push the metal finger 2201 to fit tightly against the moving contact 310.
[0044] To facilitate the discharge of hot air from the first annular cavity 240, in some embodiments of this invention, the side wall of the contact assembly 250 is provided with an exhaust port. With the aforementioned structure, the hot air inside the first annular cavity 240 is discharged through the gap 221 between the multiple metal contact fingers 2201 to the second annular cavity 260, and then the hot air can be discharged again through the exhaust port on the side wall of the contact assembly 250, thereby ensuring the ability of the fast grounding switch in this embodiment to discharge hot air.
[0045] Reference Figures 7 to 10 To improve the insulation performance of the fast grounding switch of this invention, in some embodiments, the stationary contact base 210 is provided with an isolation cover 270 that covers the outer periphery of the contact assembly 250. The end of the isolation cover 270 has a clearance hole 271 that can be adapted to the moving contact 310. By using the isolation cover 270 to cover the contact assembly 250, the annular contact 220, and the stationary arc contact 230, the insulation performance of the stationary contact assembly 200 and the moving contact assembly 300 during closing or opening is improved, thereby enhancing the insulation performance of the fast grounding switch of this invention.
[0046] Reference Figure 5 , Figure 6 , Figure 9 and Figure 10In some embodiments of this utility model, the moving contact assembly 300 includes an air nozzle 340. In this embodiment, the air nozzle 340 is made of polytetrafluoroethylene (PTFE), making it insulating and heat-resistant. The air nozzle 340 is disposed at one end of the moving contact member 310 facing the annular contact member 220. The air nozzle 340 is sleeved on the outer periphery of the moving arc contact 330. An air passage 350 is provided between the air nozzle 340 and the moving arc contact 330. In this embodiment, the gap between the air nozzle 340 and the moving arc contact 330 forms the air passage 350. The air passage 350 is connected to the receiving cavity 311. By providing an air nozzle 340 at one end of the moving contact 310 facing the annular contact 220, when the driving mechanism drives the moving contact 310 to move the moving arc contact 330 away from the annular contact 220 and causes the moving contact 310 to separate from the annular contact 220 and the moving contact 310 and the stationary arc contact 230 to separate from each other, the piston 321 drives the air inside the receiving cavity 311 to flow to the air nozzle 340. The air nozzle 340 guides the air to be concentrated and sprayed towards the stationary contact assembly 200, thereby allowing the air to better extinguish the arc that appears between the stationary arc contact 230 and the moving arc contact 330, shortening the time when the arc appears.
[0047] In some embodiments of this utility model, the air nozzle 340 has a circular channel 341 arranged along the length of the moving arc contact 330. The diameter of the circular channel 341 gradually decreases from the end of the air nozzle 340 away from the annular contact member 220 towards the end of the air nozzle 340 closer to the annular contact member 220. By adopting the above structure, the cross-sectional area of the air passage 350 between the air nozzle 340 and the moving arc contact 330 gradually decreases from the end of the air nozzle 340 away from the annular contact member 220 towards the end of the air nozzle 340 closer to the annular contact member 220. Therefore, when the piston member 321 drives the air flow to be ejected from the air nozzle 340, the air velocity can be increased, thereby allowing the air to better extinguish the arc between the stationary arc contact 230 and the moving arc contact 330, improving the air-blowing arc extinguishing of the fast grounding switch in this embodiment. Furthermore, by providing multiple notches 221 on the side wall of the annular contact 220, the hot air inside the first annular cavity 240 can be quickly discharged from the multiple notches 221 when air is sprayed onto the annular contact 220, reducing the air pressure inside the first annular cavity 240 and increasing the speed of air ejected from the air nozzle 340. Therefore, the air nozzle 340 can better extinguish the arc between the stationary arc contact 230 and the moving arc contact 330, further improving the air-blowing arc extinguishing capability of the fast grounding switch of this invention.
[0048] In some embodiments of this utility model, a first mounting plate 360 is provided at one end of the moving contact 310 facing the annular contact 220. The first mounting plate 360 is disposed inside the receiving cavity 311. A threaded mounting hole 361 is provided in the middle of the first mounting plate 360. A plurality of first air passage holes 362 are provided on the surface of the first mounting plate 360, which are circumferentially spaced around the threaded mounting hole 361. A second mounting plate 342 is provided at the end of the air nozzle 340 away from the annular contact 220, which can abut against the first mounting plate 360. The second mounting plate 342 has a clearance hole 343 at its center corresponding to the threaded mounting hole 361. The surface of the second mounting plate 342 has multiple second vent holes 344 corresponding one-to-one with the multiple first vent holes 362. The moving arc contact 330 has a threaded connection portion 331. When the moving arc contact 330 is mounted on the first mounting plate 360, the threaded connection portion 331 passes through the clearance hole 343 and is threadedly connected to the threaded mounting hole 361. The moving arc contact 330 can lock the second mounting plate 342 to the first mounting plate 360. This structure facilitates the assembly of the moving arc contact 330, the air nozzle 340, and the moving contact component 310.
[0049] Reference Figures 1 to 10 The switching device of certain embodiments of the second aspect of this utility model includes a switching device body, and the switching device body is equipped with a fast grounding switch with the above-mentioned air blowing arc extinguishing function.
[0050] The switchgear of this embodiment employs the aforementioned fast grounding switch, which allows air to be ejected from the opening 312 at the end of the moving contact 310 when the switch is opened, extinguishing the arc between the stationary arc contact 230 and the moving arc contact 330. This shortens the time for the arc to occur, prevents the stationary arc contact 230 and the moving arc contact 330 from being burned, and helps protect the stationary contact assembly 200 and the moving contact assembly 300. At the same time, the notch 221 on the side wall of the annular contact 220 helps to discharge the hot air between the stationary arc contact 230 and the moving arc contact 330, thereby shortening the insulation recovery time of the gas between the stationary arc contact 230 and the moving arc contact 330, and thus improving the insulation performance of the switchgear of this embodiment.
[0051] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.
Claims
1. A fast grounding switch with air-blowing arc-extinguishing function, characterized in that, include: Base (100); A stationary contact assembly (200) includes a stationary contact seat (210), an annular contact member (220), and a stationary arc contact (230). The stationary contact seat (210) is disposed on the base (100). The annular contact member (220) and the stationary arc contact (230) are disposed on the same side of the stationary contact seat (210). The annular contact member (220) is sleeved on the outer periphery of the stationary arc contact (230). A first annular cavity (240) is formed between the outer peripheral wall of the stationary arc contact (230) and the inner peripheral wall of the annular contact member (220). A notch (221) communicating with the first annular cavity (240) is opened on the side wall of the annular contact member (220). A moving contact assembly (300) includes a moving contact element (310), a piston rod (320), and a moving arc contact (330). The piston rod (320) is located on one side of the stationary contact assembly (200). The first end of the piston rod (320) is fixedly disposed on the base (100), and the second end of the piston rod (320) faces the annular contact element (220). The moving contact element (310) is movably sleeved on the outer periphery of the piston rod (320). The movable contact (310) has a receiving cavity (311) inside. The movable contact (310) has an opening (312) at one end facing the annular contact (220) that communicates with the receiving cavity (311). The second end of the piston rod (320) is provided with a piston (321) that can contact the inner peripheral wall of the receiving cavity (311). The movable arc contact (330) is located at the end of the movable contact (310) facing the annular contact (220). A driving mechanism is provided on the base (100). The driving mechanism is connected to the moving contact (310) in a transmission manner. The driving mechanism can drive the moving contact (310) to move the moving arc contact (330) along the axial direction of the piston rod (320) to approach or move away from the annular contact (220). The driving mechanism drives the moving contact (310) to move the moving arc contact (330) closer to the annular contact (220) and make the moving contact (310) and the annular contact (220) interlock. When the moving contact (310) and the stationary arc contact (230) are interlocked, the piston (321) is located at the end of the receiving cavity (311) away from the annular contact (220). The driving mechanism drives the moving contact (310) to move the moving arc contact (330) away from the annular contact (220), causing the moving contact (310) and the annular contact (220) to separate from each other. During the process of the moving contact (310) and the stationary arc contact (230) separating from each other, the piston (321) moves from one end of the receiving cavity (311) away from the annular contact (220) to the other end of the receiving cavity (311) closer to the annular contact (220). The piston (321) can push the air inside the receiving cavity (311) to be sprayed toward the stationary contact assembly (200).
2. A fast grounding switch with air-blowing arc-extinguishing function according to claim 1, characterized in that, The annular contact (220) has a plurality of notches (221) on its sidewall, and the plurality of notches (221) are evenly spaced along the circumferential direction of the annular contact (220).
3. A fast grounding switch with air-blowing arc-extinguishing function according to claim 2, characterized in that, The annular contact (220) is formed by a plurality of independent metal fingers (2201) joined together. All the metal fingers (2201) are arranged at intervals along the outer periphery of the stationary arc contact (230) on the stationary contact seat (210), and there is a notch (221) between two adjacent metal fingers (2201).
4. A fast grounding switch with air-blowing arc-extinguishing function according to claim 3 or above, characterized in that, The stationary contact base (210) is provided with an annular positioning member (211) arranged around the outer periphery of the stationary arc contact (230). A contact assembly (250) is sleeved on the outer periphery of the annular positioning member (211). The contact assembly (250) is fixedly disposed on the stationary contact base (210). A second annular cavity (260) is provided between the contact assembly (250) and the annular positioning member (211). All the metal contact fingers (2201) of the annular contact member (220) are movably installed in the second annular cavity (260). The metal fingers (2201) are arranged sequentially at intervals around the outer periphery of the annular positioning member (211). All the metal fingers (2201) have a protrusion (2203) that protrudes from the outside of the second annular cavity (260) and extends toward the static arc contact (230). An elastic element is provided between each metal finger (2201) and the contact assembly (250). One end of the elastic element abuts against the contact assembly (250), and the other end of the elastic element abuts against the inner wall of the contact assembly (250).
5. A fast grounding switch with air-blowing arc-extinguishing function according to claim 4, characterized in that, Each of the metal fingers (2201) has a mounting groove (2202) on one side of the inner wall of the contact assembly (250). One end of the elastic member is embedded in the mounting groove (2202), and the other end of the elastic member abuts against the inner wall of the contact assembly (250).
6. A fast grounding switch with air-blowing arc-extinguishing function according to claim 5, characterized in that, The contact assembly (250) has an exhaust port on its side wall.
7. A fast grounding switch with air-blowing arc-extinguishing function according to claim 4, 5, or 6, characterized in that, The stationary contact seat (210) is provided with an isolation cover (270) that covers the outer periphery of the contact assembly (250), and the end of the isolation cover (270) is provided with a clearance hole (271) that can be adapted to the moving contact (310).
8. A fast grounding switch with air-blowing arc-extinguishing function according to claim 1, characterized in that, The moving contact assembly (300) includes an air nozzle (340), which is disposed at one end of the moving contact member (310) facing the annular contact member (220). The air nozzle (340) is sleeved on the outer periphery of the moving arc contact (330). An air passage (350) is provided between the air nozzle (340) and the moving arc contact (330), and the air passage (350) is connected to the receiving cavity (311).
9. A fast grounding switch with air-blowing arc-extinguishing function according to claim 8, characterized in that, The air nozzle (340) has a circular channel (341) arranged along the length of the moving arc contact (330). The diameter of the circular channel (341) gradually decreases from the end of the air nozzle (340) away from the annular contact member (220) towards the end of the air nozzle (340) closer to the annular contact member (220).
10. A switchgear, characterized in that, The device includes a switchgear body, which is equipped with a fast grounding switch with an air-blowing arc-extinguishing function as described in any one of claims 1 to 9.