High-speed grounding switch and GIS equipment

Abstract

The invention relates to the technical field of switch equipment, and particularly discloses a high-speed grounding switch and GIS equipment. The high-speed grounding switch comprises a three-phase static contact assembly, a cylinder body, a piston plate and a three-phase moving contact. The piston plate is slidably connected to the inner circumferential wall of the cylinder body, and the piston plate and the cylinder body define an air chamber. The three-phase moving contacts and the three-phase static contact assemblies are arranged in a one-to-one correspondence mode, each phase of moving contact penetrates through the cylinder body and the piston plate, and the moving contacts can slide relative to the cylinder body and drive the piston plate to move; the moving contact is of a hollow rod-shaped structure, one end of the moving contact is provided with an exhaust port opposite to the static contact assembly, the moving contact is provided with a vent hole communicated with the inner space of the moving contact and the air chamber, and the other end of the moving contact is closed and used for being connected with a driving device. And the driving device can drive the three-phase moving contact to be synchronously contacted with or separated from the three-phase static contact assembly. The high-speed grounding switch is high in capability of cutting off electromagnetic induction current, and the number of parts is small.

Description

Technical Field

[0001] The present invention relates to the technical field of switch equipment, and in particular to a fast grounding switch and GIS equipment. Background Art

[0002] Gas Insulated Metal-enclosed Switchgear (GIS) is an important control and protection device in the power system. Traditional GIS equipment uses SF6 as the insulating gas, but due to the poor environmental performance of SF6 gas, in order to protect the environment, clean air is generally used to replace SF6.

[0003] Although clean air can play an insulating role, its insulation performance is not as good as SF6 gas, which makes the arcing time of the fast grounding switch in the GIS equipment longer when it is opened, thereby reducing the ability of the fast grounding switch to cut off the electromagnetic induction current. In addition, the extension of the arcing time will also damage the moving and static contacts of the fast grounding switch, shortening the service life of the fast grounding switch.

[0004] Therefore, it is urgent to propose a fast grounding switch and GIS equipment to solve the above technical problems. Summary of the invention

[0005] According to one aspect of the present invention, the present invention provides a fast earthing switch. When the moving contact is separated from the stationary contact, the moving contact can spray gas to blow out the arc, and the synchronization of the three-phase moving contacts is high, which greatly improves the ability of the fast earthing switch to cut off the electromagnetic induction current. In addition, there are fewer parts, which improves the compactness of the structure and facilitates installation.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] Fast earthing switch, including:

[0008] Three-phase stationary contact assembly;

[0009] Cylinder body;

[0010] A piston plate is slidably connected to the inner peripheral wall of the cylinder body, and the piston plate and the cylinder body form an air chamber;

[0011] Three-phase moving contacts are arranged one by one with the three-phase static contact assemblies, and each phase moving contact is penetrated through the cylinder body and the piston plate, and the moving contact can slide relative to the cylinder body and drive the piston plate to move;

[0012] The moving contact is a hollow rod-shaped structure, one end of the moving contact has an exhaust port arranged opposite to the static contact assembly, and a vent hole connecting the internal space of the moving contact and the air chamber is provided on the moving contact. The other end of the moving contact is closed and used to be connected to the driving device, and the driving device can drive the three-phase moving contact to synchronously contact or separate with the three-phase static contact assembly.

[0013] Optionally, the driving device includes a driving member and a connecting member, one side of the connecting member is connected to the closed end of the three-phase moving contact, and the other side of the connecting member is connected to the output shaft of the driving member, and the driving member drives the connecting member to move along the axial direction of the moving contact through the output shaft.

[0014] Optionally, the fast earthing switch also includes a shell, the driving member is arranged on the shell, the output shaft of the driving member is placed in the shell, and a guide shaft extending along the axial direction of the moving contact is also provided in the shell, and the guide shaft is slidably passed through the connecting member to provide guidance for the connecting member.

[0015] Optionally, a center hole is formed in the moving contact, and the center hole includes a first air outlet segment extending along the axial direction of the moving contact and a second air outlet segment arranged at the end of the first air outlet segment close to the static contact assembly, and the diameter of the second air outlet segment gradually increases along the axial direction of the moving contact close to the static contact assembly, and the diameter of one end of the second air outlet segment connected to the first air outlet segment is smaller than the diameter of the first air outlet segment.

[0016] Optionally, the cylinder body is an integrally formed cylindrical structure with one end closed and the other end open; or, the cylinder body comprises an insulating plate (300) and a cylinder barrel (400), wherein the insulating plate (300) is fixedly mounted on the inner circumferential wall of the housing (200) of the fast earthing switch and is sealedly connected to the cylinder barrel (400) to form the air chamber (600) with the piston plate (500).

[0017] Optionally, the insulating plate is provided with through holes corresponding to the three-phase moving contacts one by one, each of the through holes is provided with a first guide ring, the moving contact is slidably and sealingly connected to the corresponding first guide ring, and the inner circumferential wall of the first guide ring is smoothly arranged; and / or, the piston plate outer sleeve is provided with a second guide ring, the second guide ring is slidably connected to the inner circumferential wall of the cylinder, and the outer circumferential wall of the second guide ring is smoothly arranged.

[0018] Optionally, threaded holes corresponding to the three-phase moving contacts are provided on the piston plate, and an external thread is provided on the outer wall of each moving contact, and the moving contact is connected to the corresponding threaded hole through the external thread.

[0019] Optionally, the stationary contact assembly comprises:

[0020] A stationary contact seat, wherein a first mounting hole is provided in the middle of the stationary contact seat;

[0021] A guide rod, one end of which is slidably disposed in the first mounting hole;

[0022] A static contact, arranged at the other end of the guide rod;

[0023] The first elastic member is sleeved outside the guide rod, and two ends of the first elastic member are respectively abutted against the static contact seat and the end of the other end of the guide rod.

[0024] Optionally, a third guide ring is provided in the first mounting hole, the guide rod is slidably disposed in the third guide ring, and the first elastic member is a tower spring.

[0025] Optionally, the fast earthing switch also includes a shell, the cylinder body is installed on the shell, and the shell is provided with insulators corresponding to the moving contacts one by one, and one end of the moving contact of each phase away from the static contact assembly is connected to the corresponding insulator through a flexible connector.

[0026] According to another aspect of the present invention, the present invention further provides a GIS device, comprising a device body and a fast grounding switch as described in any of the above technical solutions, wherein the fast grounding switch is arranged in the device body.

[0027] The beneficial effects of the present invention are:

[0028] The invention provides a fast earthing switch, comprising a three-phase static contact assembly, a cylinder, a piston plate and a three-phase moving contact. The three-phase moving contact can be driven by a driving device to synchronously contact or separate with the three-phase static contact assembly, thereby improving the synchronization of the three-phase closing and opening of the fast earthing switch.

[0029] When the rapid earthing switch is closed, the moving contact will drive the piston plate to move, thereby expanding the air chamber, and the external gas will enter the moving contact from the exhaust port and be stored in the air chamber through the vent. When the rapid earthing switch is opened, the moving contact will drive the piston plate to compress the gas stored in the air chamber, so that the gas in the air chamber enters the moving contact through the vent, and finally blows to the position where the moving contact and the static contact assembly are disconnected through the exhaust port, thereby blowing out the arc generated when the moving contact and the static contact assembly are disconnected, thereby improving the ability of the rapid earthing switch to cut off the electromagnetic induction current.

[0030] The cylinder body and the piston plate form a cylinder structure for providing compressed air. The three-phase moving contacts share one cylinder. Compared with the situation in which each of the three-phase moving contacts has one cylinder, on the one hand, two cylinders are saved, which further simplifies the components of the fast earthing switch, improves the structural compactness of the fast earthing switch, and facilitates the installation of the fast earthing switch; on the other hand, synchronous air blowing can be performed when the three-phase moving contact is separated from the three-phase static contact assembly, thereby improving the synchronization of the disconnection of the three-phase moving contact.

[0031] The present invention also provides a GIS device, comprising a device body and the above-mentioned fast grounding switch. The GIS device has better use safety due to the use of the above-mentioned fast grounding switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of a fast grounding switch provided in an embodiment of the present invention;

[0033] Figure 2 A cross-sectional view of a fast earthing switch in a closed state provided by an embodiment of the present invention;

[0034] Figure 3 A cross-sectional view of a fast grounding switch provided by an embodiment of the present invention in an open state;

[0035] Figure 4 for Figure 3 A magnified view at point A;

[0036] Figure 5 A cross-sectional view of a fast earthing switch provided by an embodiment of the present invention with the three-phase static contact assembly hidden;

[0037] Figure 6 A cross-sectional view of a stationary contact assembly provided by an embodiment of the present invention;

[0038] Figure 7 A schematic diagram of a fast grounding switch provided by an embodiment of the present invention with part of the housing removed;

[0039] Figure 8 A schematic diagram of a fast earthing switch provided in an embodiment of the present invention with a three-phase static contact assembly and a portion of the housing hidden.

[0040] In the figure:

[0041] 100, static contact assembly; 110, static contact conductor; 111, third guide ring; 120, guide rod; 130, static contact; 140, first elastic member; 150, contact finger seat; 151, strap contact finger; 160, contact cover; 170, contact finger sheet; 171, limit ring; 180, second elastic member; 190, shielding cover;

[0042] 200, housing; 210, insulator; 220, mounting ear plate;

[0043] 300, insulating plate; 310, first guide ring;

[0044] 400, cylinder;

[0045] 500, piston plate; 510, second guide ring;

[0046] 600, air chamber;

[0047] 700, moving contact; 710, center hole; 711, first air outlet section; 712, second air outlet section; 720, vent hole;

[0048] 800, driving device; 810, driving member; 811, output shaft; 820, connecting member; 821, insulating connecting plate; 830, guide shaft;

[0049] 900. Soft connector. DETAILED DESCRIPTION

[0050] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0054] This embodiment provides a fast earthing switch. When the moving contact is separated from the stationary contact, the moving contact can spray gas to blow out the arc. In addition, the synchronization of the three-phase moving contacts is high, which greatly improves the ability of the fast earthing switch to cut off the electromagnetic induction current. In addition, there are fewer parts, which improves the compactness of the structure and facilitates installation.

[0055] like Figure 1-Figure 5 As shown, the fast earthing switch includes a three-phase static contact assembly 100 , a cylinder body, a piston plate 500 and a three-phase moving contact 700 .

[0056] The three-phase static contact assembly 100 belongs to the static side of the rapid earthing switch, the cylinder body, the piston plate 500 and the three-phase moving contact 700 belong to the moving side of the rapid earthing switch, and the three-phase moving contact 700 is driven by the driving device 800 .

[0057] Specifically, the piston plate 500 is slidably connected to the inner peripheral wall of the cylinder body, and the piston plate 500 and the cylinder body enclose an air chamber 600. The three-phase moving contact 700 is arranged in a one-to-one correspondence with the three-phase static contact assembly 100, and each phase moving contact 700 is penetrated through the cylinder body and the piston plate 500. The moving contact 700 can slide relative to the cylinder body and drive the piston plate 500 to move. The moving contact 700 is a hollow rod-shaped structure, and one end of the moving contact 700 has an exhaust port arranged opposite to the static contact assembly 100. The moving contact 700 is provided with a vent hole 720 connecting the internal space of the moving contact 700 and the air chamber 600. The other end of the moving contact 700 is closed, and the other end of the moving contact 700 is connected to the driving device 800. The driving device 800 is used to drive the three-phase moving contact 700 to synchronously contact or separate with the three-phase static contact assembly 100.

[0058] The working process of the fast grounding switch provided in this embodiment is as follows:

[0059] When the switch is closed, the moving contact 700 will drive the piston plate 500 to move so that the air chamber 600 becomes larger, and the external gas will enter the moving contact 700 from the exhaust port on the moving contact 700, and finally enter the air chamber 600 through the vent 720 for storage.

[0060] When opening the switch, the moving contact 700 will drive the piston plate 500 to compress the gas stored in the air chamber 600, so that the gas in the air chamber 600 enters the internal space of the moving contact 700 through the vent 720, and finally blows from the exhaust port to the position where the moving contact 700 and the static contact assembly 100 are disconnected, thereby blowing out the arc generated when the moving contact 700 and the static contact assembly 100 are disconnected, thereby improving the ability of the fast grounding switch to cut off the electromagnetic induction current.

[0061] The cylinder body and piston plate 500 of the fast earthing switch constitute a cylinder structure for providing compressed air. In the present embodiment, the three-phase moving contacts 700 share one cylinder. Compared with each of the three-phase moving contacts 700 being provided with one cylinder, on the one hand, two cylinders are saved, thereby further simplifying the components of the fast earthing switch, improving the structural compactness of the fast earthing switch, and facilitating the installation of the fast earthing switch; on the other hand, synchronous air blowing can be performed when the three-phase moving contact 700 is separated from the three-phase static contact assembly 100, thereby improving the synchronization of the disconnection of the three-phase moving contact 700.

[0062] The driving device 800 of the rapid earthing switch can drive the three-phase moving contact 700 to synchronously contact or separate with the three-phase static contact assembly 100, thereby improving the synchronization of the three-phase closing and opening of the rapid earthing switch.

[0063] Optionally, a plurality of vent holes 720 may be provided. Providing a plurality of vent holes 720 can not only improve the reliability of air storage and air blowing, but also reduce the weight of the moving contact 700 .

[0064] Further, see Figure 2 and Figure 3 In this embodiment, the fast grounding switch further includes a housing 200, and the cylinder body includes an insulating plate 300 and a cylinder barrel 400, and the insulating plate 300 is fixedly mounted on the inner circumferential wall of the housing 200 and is sealed and connected to the cylinder barrel 400. That is, in this embodiment, the cylinder barrel 400, the insulating plate 300 and the piston plate 500 together form a cylinder structure, and the insulating plate 300 is both a part of the cylinder and a part connecting the cylinder and the housing 200, realizing "one thing for two uses" and saving parts for fixing the cylinder to the housing 200. Of course, in other embodiments, the cylinder body can also be an integrally formed cylindrical structure with one end closed and the other end open.

[0065] Optionally, continue to see Figure 5, mounting ear plates 220 can be provided on opposite sides of the inner circumferential wall of the housing 200, and both ends of the insulating plate 300 can be connected to the corresponding mounting ear plates 220 by bolt connection. The insulating plate 300 is installed on the housing 200 by the mounting ear plates 220, which has a simple structure and is convenient for installation and removal.

[0066] Optionally, the cylinder 400 may also be fixed to the insulating plate 300 by bolt connection. The bolt connection has a simple structure, is convenient to install and disassemble, and has better connection reliability.

[0067] Further, see Figure 3 A central hole 710 is formed in the moving contact 700. The central hole 710 includes a first gas outlet section 711 extending in the axial direction of the moving contact 700 and a second gas outlet section 712 provided at the end of the first gas outlet section 711 close to the stationary contact assembly 100. The diameter of the second gas outlet section 712 gradually increases as it approaches the stationary contact assembly 100 in the axial direction of the moving contact 700, and the diameter of the end of the second gas outlet section 712 connected to the first gas outlet section 711 is smaller than the diameter of the first gas outlet section 711. With such a configuration, the connection between the second gas outlet section 712 and the first gas outlet section 711 has a pressurizing effect, which can increase the flow rate of the gas, thereby improving the ability of the gas to blow out the arc.

[0068] It can be understood that the end of the second air outlet section 712 with a larger opening is an exhaust port.

[0069] Optionally, continue to see Figure 2-Figure 4 In a possible embodiment, the insulating plate 300 is provided with through holes corresponding to the three-phase moving contacts 700, each through hole is provided with a first guide ring 310, the moving contact 700 is slidably sealed and connected to the corresponding first guide ring 310, and the inner peripheral wall of the first guide ring 310 is smoothly arranged. By providing the first guide ring 310, the movement of the moving contact 700 can be further guided to improve the alignment of the moving contact 700 and the static contact assembly 100. By providing the inner peripheral wall of the first guide ring 310 smoothly, the smoothness of the movement of the moving contact 700 can be improved.

[0070] Optionally, continue to see Figure 2-Figure 4In another possible embodiment, a second guide ring 510 is disposed on the outer sleeve of the piston plate 500, and the second guide ring 510 is slidably connected to the inner peripheral wall of the cylinder 400, and the outer peripheral wall of the second guide ring 510 is smoothly arranged. By arranging the second guide ring 510, the movement of the piston plate 500 can be guided, thereby playing the purpose of assisting in guiding the movement of the moving contact 700, and improving the alignment of the moving contact 700 and the static contact assembly 100. By arranging the inner and outer walls of the second guide ring 510 to be smooth, the smoothness of the movement of the piston plate 500 can be improved, and the smoothness of the movement of the moving contact 700 can be improved.

[0071] In this embodiment, the insulating plate 300 is provided with through holes corresponding to the three-phase moving contacts 700, each through hole is provided with a first guide ring 310, the moving contact 700 is slidably sealed and connected to the corresponding first guide ring 310, and the inner peripheral wall of the first guide ring 310 is smoothly set. In addition, the piston plate 500 is provided with a second guide ring 510, the second guide ring 510 is slidably connected to the inner peripheral wall of the cylinder 400, and the outer peripheral wall of the second guide ring 510 is smoothly set.

[0072] Optionally, the first guide ring 310 can be made of polytetrafluoroethylene material, which has the advantages of wear resistance and corrosion resistance and a long service life. Of course, the second guide ring 510 can also be made of polytetrafluoroethylene material.

[0073] Optionally, in this embodiment, the piston plate 500 is provided with threaded holes corresponding to the three-phase moving contacts 700, and the outer wall of each moving contact 700 is provided with external threads, and the moving contact 700 is connected to the corresponding threaded hole through the external threads. The connection between the moving contact 700 and the piston plate 500 is realized by threaded connection, the connection strength is high, and the installation and disassembly are relatively convenient.

[0074] Furthermore, if Figure 6As shown, the static contact assembly 100 includes a static contact seat 110, a guide rod 120, a static contact 130 and a first elastic member 140. Among them, a first mounting hole is provided in the middle of the static contact seat 110, one end of the guide rod 120 is slidably provided in the first mounting hole, the other end of the guide rod 120 is provided with a static contact 130, the first elastic member 140 is sleeved outside the guide rod 120, and the two ends of the first elastic member 140 are respectively abutted against the ends of the static contact seat 110 and the other end of the guide rod 120. In this way, when closing the switch, the moving contact 700 will first contact the static contact 130, and then as the moving contact 700 further moves, the moving contact 700 will push the guide rod 120 to slide and compress the first elastic member 140. Under the elastic restoring force of the first elastic member 140, the contact reliability between the moving contact 700 and the static contact 130 can be improved, thereby improving the reliability of the closing operation of the fast grounding switch. When opening the switch, in the initial stage of opening the switch, the moving contact 700 moves in the direction away from the static contact 130, driving the piston plate 500 to compress the gas in the air chamber 600. However, under the elastic action of the first elastic member 140, the moving contact 700 will not be separated from the static contact 130 immediately, but will maintain contact with the static contact 130 for a period of time. During this process, the static contact 130 will block the exhaust port, so that the pressure of the gas in the air chamber 600 will increase under the heating effect of the electric arc. After the pressure is increased, the pressure of the gas blown toward the arc will also increase at the moment when the moving contact 700 is separated from the static contact 130. The greater the pressure of the gas blown toward the arc, the better the effect of blowing out the arc, thereby improving the efficiency of blowing out the arc, and thereby improving the ability of the fast grounding switch to interrupt the electromagnetic induction current.

[0075] Optionally, in a possible embodiment, the first elastic member 140 may be a tower spring, which has the advantages of small size, large load, variable stiffness, small space occupation, and small deformation under the condition of providing the same pressure.

[0076] Optionally, the stationary contact 130 can be made of copper tungsten material, which has the advantages of arc initiation and ablation resistance. Further, the stationary contact 130 is a "mushroom head" shape, which can reduce the electric field strength and is also convenient for blocking the exhaust port on the moving contact 700 when contacting the moving contact 700.

[0077] Further, see Figure 6The stationary contact assembly 100 further includes a contact finger seat 150, a contact cover 160, a contact finger piece 170 and a second elastic member 180. The contact finger seat 150 is arranged on the stationary contact seat 110, and a second mounting hole is arranged on the contact finger seat 150, and one end of the guide rod 120 is slidably arranged in the second mounting hole. The contact cover 160 is arranged on the contact finger seat 150, and the contact cover 160 is cylindrical. The contact finger piece 170 is arranged on the contact finger seat 150, and a plurality of contact finger pieces 170 are arranged along the inner peripheral wall of the contact cover 160. A second elastic member 180 is arranged between each contact finger piece 170 and the inner peripheral wall of the contact cover 160. During the process of the moving contact 700 contacting the static contact 130 and compressing the first elastic member 140, the moving contact 700 will enter the space surrounded by the multiple contact finger pieces 170 and contact the contact finger pieces 170, and expand the space surrounded by the multiple contact finger pieces 170, so that the second elastic member 180 is compressed. The compressed second elastic member 180 can apply pressure to the contact finger pieces 170 through the elastic restoring force, so that the contact finger pieces 170 and the moving contact 700 can be reliably in contact.

[0078] Optionally, the second elastic member 180 has a conductive property, so that the contact finger piece 170 can achieve flow through the contact finger seat 150 via the second elastic member 180 and the contact cover 160 .

[0079] It is understandable that the second elastic member 180 may be, but is not limited to, a spring.

[0080] Optionally, the contact cover 160 can be fixed to the contact finger seat 150 by bolt connection, and the contact finger seat 150 can also be fixed to the stationary contact head seat 110 by bolt connection, which has a simple structure and is convenient for installation and disassembly.

[0081] Further, see Figure 6 In a possible embodiment, a watchband contact finger 151 is provided in the second mounting hole, and the guide rod 120 is slidably provided in the watchband contact finger 151. By providing the watchband contact finger 151, on the one hand, the movement of the guide rod 120 can be guided, and the alignment between the static contact 130 and the moving contact 700 can be improved; on the other hand, the smoothness of the movement of the guide rod 120 can be improved; on the other hand, the watchband contact finger 151 has conductive properties, and reliable flow between the contact finger seat 150 and the guide rod 120 can be achieved.

[0082] Optionally, in another possible embodiment, a plurality of contact finger pieces 170 are provided with a limiting ring 171, and the guide rod 120 and the second elastic member 180 are passed through the limiting ring 171. By providing the limiting ring 171, on the one hand, the contact finger pieces 170 can be prevented from shifting; on the other hand, the movement of the guide rod 120 can be guided.

[0083] Optionally, the limiting ring 171 may be a steel ring.

[0084] Further, see Figure 6 The stationary contact assembly 100 further includes a shielding cover 190, which is disposed on the stationary contact seat 110 and covers the guide rod 120, the contact finger seat 150 and the contact cover 160. By providing the shielding cover 190, the guide rod 120, the contact finger seat 150 and the contact cover 160 can be protected.

[0085] Furthermore, if Figure 7 and Figure 8 As shown, the driving device 800 includes a driving member 810 and a connecting member 820. One side of the connecting member 820 is connected to the closed end of the three-phase moving contact 700, and the other side of the connecting member 820 is connected to the output shaft 811 of the driving member 810. The driving member 810 drives the connecting member 820 to move along the axial direction of the moving contact 700 through the output shaft 811. By connecting the three-phase moving contacts 700 to the connecting member 820 and then using the driving member 810 to drive the connecting member 820 to move, the purpose of driving the three-phase moving contacts 700 to move synchronously is achieved, and the structure is simple and the control is convenient.

[0086] Optionally, the fast grounding switch further includes a housing 200, a driving member 810 is disposed on the housing 200, an output shaft 811 of the driving member 810 is disposed in the housing 200, a guide shaft 830 extending along the axial direction of the moving contact 700 is further disposed in the housing 200, and the guide shaft 830 is slidably penetrated through the connecting member 820 to provide guidance for the connecting member 820. Through the cooperation between the guide shaft 830 and the connecting member 820, the guide shaft 830 can guide the movement of the moving contact 700, thereby improving the reliability of closing and opening between the moving contact 700 and the static contact assembly 100.

[0087] Optionally, a plurality of guide shafts 830 may be provided to improve the force uniformity of the connecting member 820, thereby improving the smoothness of the relative movement between the connecting member 820 and the guide shaft 830. In this embodiment, two guide shafts 830 are provided, and the two guide shafts 830 are respectively provided at both ends of the connecting member 820. In other embodiments, the number and arrangement of the guide shafts 830 may also be other, and may be arranged according to actual needs, and this application does not make specific limitations.

[0088] Optionally, the driving member 810 may be a mechanism such as a cylinder or a hydraulic cylinder that can output linear motion, which may be configured according to actual needs and is not specifically limited in this application.

[0089] Optionally, continue to see Figure 8In this embodiment, the connector 820 is provided with an insulating connecting plate 821 corresponding to the three-phase moving contact 700. One end of the moving contact 700 close to the insulating connecting plate 821 is pressed into a plate-like structure. The plate-like structure and the corresponding insulating connecting plate 821 can be connected by bolts. Such a configuration has a simple structure and is convenient for the installation and removal of the moving contact 700 and the connector 820. Of course, in other embodiments, the insulating connection method between the moving contact 700 and the connector 820 can also be other, which can be set according to actual needs, and this application does not make specific limitations.

[0090] Optionally, in this embodiment, the connecting member 820 and the insulating connecting plate 821 are an integrated structure for ease of processing.

[0091] Furthermore, two insulating connecting plates 821 may be provided corresponding to each moving contact 700 , and the two insulating connecting plates 821 clamp the moving contact 700 . Such a configuration further improves the reliability of the connection between the moving contact 700 and the connecting member 820 .

[0092] Further, see Figure 5 and Figure 8 The housing 200 is provided with insulators 210 corresponding to the moving contacts 700 one by one, and one end of each phase moving contact 700 away from the stationary contact assembly 100 is connected to the corresponding insulator 210 through a flexible connector 900. The flexible connector 900 has flexibility and can ensure reliable connection between the moving contact 700 and the insulator 210 during the movement of the moving contact 700 to meet the insulation requirements.

[0093] This embodiment also provides a GIS device, including a device body and the above-mentioned fast grounding switch, wherein the fast grounding switch is arranged in the device body. Due to the use of the above-mentioned fast grounding switch, the GIS device has a strong ability to switch current and is safer to use.

[0094] It is understandable that the device body is filled with insulating gas, such as clean air, and the gas in the air chamber 600 of the fast grounding switch comes from the insulating gas in the device body.

[0095] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Fast earthing switch, characterized in that: include: Three-phase stationary contact assembly (100); Cylinder body; A piston plate (500) is slidably connected to the inner peripheral wall of the cylinder body, and the piston plate (500) and the cylinder body form an air chamber (600); Three-phase moving contacts (700) are arranged in one-to-one correspondence with the three-phase static contact assemblies (100), and each phase of the moving contact (700) is penetrated through the cylinder body and the piston plate (500), and the moving contact (700) can slide relative to the cylinder body and drive the piston plate (500) to move; The moving contact (700) is a hollow rod-shaped structure. One end of the moving contact (700) has an exhaust port arranged opposite to the static contact assembly (100). The moving contact (700) is provided with an air vent (720) connecting the internal space of the moving contact (700) and the air chamber (600). The other end of the moving contact (700) is closed and used to be connected to a drive device (800). The drive device (800) can drive the three-phase moving contact (700) to synchronously contact or separate with the three-phase static contact assembly (100).

2. The fast earthing switch according to claim 1, characterized in that: The driving device (800) comprises a driving member (810) and a connecting member (820), one side of the connecting member (820) is connected to the closed end of the three-phase moving contact (700), and the other side of the connecting member (820) is connected to the output shaft (811) of the driving member (810), and the driving member (810) drives the connecting member (820) to move along the axial direction of the moving contact (700) via the output shaft (811).

3. The fast earthing switch according to claim 2, characterized in that: The fast earthing switch also includes a housing (200), the driving member (810) is arranged on the housing (200), the output shaft (811) of the driving member (810) is placed in the housing (200), and a guide shaft (830) extending along the axial direction of the moving contact (700) is also provided in the housing (200), and the guide shaft (830) is slidably penetrated through the connecting member (820) to provide guidance for the connecting member (820).

4. The fast grounding switch according to claim 1, characterized in that: A center hole (710) is formed in the moving contact (700), and the center hole (710) includes a first air outlet section (711) extending along the axial direction of the moving contact (700) and a second air outlet section (712) arranged at an end of the first air outlet section (711) close to the stationary contact assembly (100), and the diameter of the second air outlet section (712) gradually increases as it approaches the stationary contact assembly (100) along the axial direction of the moving contact (700), and the diameter of one end of the second air outlet section (712) connected to the first air outlet section (711) is smaller than the diameter of the first air outlet section (711).

5. The fast earthing switch according to claim 1, characterized in that: The cylinder body is an integrally formed cylindrical structure with one end closed and the other end open; Alternatively, the cylinder body comprises an insulating plate (300) and a cylinder barrel (400), wherein the insulating plate (300) is fixedly mounted on the inner peripheral wall of the housing (200) of the fast earthing switch and is sealedly connected to the cylinder barrel (400) to form the air chamber (600) with the piston plate (500).

6. The fast earthing switch according to claim 5, characterized in that: The insulating plate (300) is provided with through holes corresponding to the three-phase moving contacts (700) one by one, each of the through holes is provided with a first guide ring (310), the moving contact (700) is slidably sealed and connected to the corresponding first guide ring (310), and the inner peripheral wall of the first guide ring (310) is smoothly arranged; And / or, the outer sleeve of the piston plate (500) is provided with a second guide ring (510), the second guide ring (510) is slidably connected to the inner circumferential wall of the cylinder (400), and the outer circumferential wall of the second guide ring (510) is smoothly arranged.

7. The fast earthing switch according to any one of claims 1 to 6, characterized in that: The stationary contact assembly (100) comprises: A stationary contact seat (110), wherein a first mounting hole is provided in the middle of the stationary contact seat (110); A guide rod (120), one end of which is slidably disposed in the first mounting hole; A stationary contact (130) is arranged at the other end of the guide rod (120); The first elastic member (140) is sleeved outside the guide rod (120), and two ends of the first elastic member (140) respectively abut against the end of the stationary contact seat (110) and the other end of the guide rod (120).

8. The fast earthing switch according to claim 7, characterized in that: A third guide ring (111) is provided in the first mounting hole, and the guide rod (120) is slidably arranged in the third guide ring (111). Meanwhile, the first elastic member (140) is a tower spring.

9. The fast grounding switch according to claim 1, characterized in that: The fast earthing switch also includes a housing (200), the cylinder body is mounted on the housing (200), and insulators (210) corresponding one to one with the moving contacts (700) are provided on the housing (200), and the other end of the moving contact (700) of each phase is connected to the corresponding insulator (210) via a flexible connector (900).

10. GIS equipment, characterized in that The invention comprises a device body and the fast earthing switch according to any one of claims 1 to 9, wherein the fast earthing switch is arranged in the device body.

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