Load-break switch and ring main unit

Abstract

A load-break switch and a ring main unit. Vacuum arc-extinguishing mechanisms of the load-break switch are conductively connected to second moving contacts; during opening of the load-break switch, first moving contacts can be conductively connected to the second moving contacts when rotating around a first direction; in this case, the first moving contacts, the second moving contacts, and the vacuum arc-extinguishing mechanisms form a conductive loop.

Description

Load switch and ring main unit

[0001] The present application claims priority to the Chinese patent application No. 202410823119.2 filed on June 25, 2024 with the China National Intellectual Property Office, the content of which is incorporated herein in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of electrical equipment, for example to a load switch and a ring main unit. BACKGROUND

[0003] In the field of medium-voltage gas-filled ring main units, SF6 gas has been widely used as an insulating medium in the past. SF6 gas has excellent breaking performance and can extinguish the arc formed between the contacts of a load switch during breaking. However, SF6 is a greenhouse gas that has a great harm to the environment. Instead, environmentally friendly gas-filled ring main units are used, which usually use dry air as an insulating medium. However, dry air itself does not have the ability to break the load current of a load switch. The solution is to connect a vacuum arc-extinguishing mechanism in series at the upper end of a three-position load switch, which realizes breaking the load current by the vacuum arc-extinguishing mechanism. Since the vacuum arc-extinguishing mechanism is connected in series in the main current circuit, it needs to have short-circuit closing ability, short-time current resistance, peak current resistance and continuous current resistance. The requirements for the vacuum arc-extinguishing mechanism are high, and the vacuum arc-extinguishing mechanism that meets the above requirements is large in size. In addition, an additional operating mechanism needs to be configured to control the breaking of the vacuum arc-extinguishing mechanism, thereby increasing the manufacturing cost of the ring main unit. Moreover, when the load switch is broken, the vacuum arc-extinguishing mechanism needs to be broken first, and then the main circuit of the load switch needs to be broken, which complicates the operation process.

[0004] SUMMARY

[0005] The present application provides a load switch and a ring main unit, which reduces the requirements for the vacuum arc-extinguishing mechanism, does not need to additionally set an operating mechanism for controlling the breaking of the vacuum arc-extinguishing mechanism, thereby reducing the manufacturing cost of the ring main unit and simplifying the operation steps of the load switch.

[0006] In a first aspect, the embodiments of the present application provide a load switch having a closed position and an open position, the load switch comprising:

[0007] a first movable contact, which is rotationally arranged;

[0008] a vacuum arc-extinguishing mechanism, which is arranged corresponding to the first movable contact;

[0009] The transmission mechanism comprises a connecting rod assembly, one end of the connecting rod assembly is connected with a moving end of the vacuum arc extinguishing mechanism, the other end of the connecting rod assembly is rotatably provided with a second moving contact, the second moving contact is in conductive connection with the vacuum arc extinguishing mechanism, in the closed position, the first moving contact is arranged on a first side of the second moving contact, in the open position, the first moving contact is arranged on a second side of the second moving contact;

[0010] During the movement of the load switch from the closed position to the open position, the first moving contact can be in conductive contact with the second moving contact in the first direction, and the second moving contact is rotated to drive the connecting rod assembly to trigger the vacuum arc extinguishing mechanism to break, and the first moving contact can pass through the second moving contact and be arranged on the second side of the second moving contact.

[0011] During the movement of the load switch from the open position to the closed position, the first moving contact can be in insulating contact with the connecting rod assembly in the second direction, and the second moving contact is rotated, and the first moving contact can pass through the second moving contact and be arranged on the first side of the second moving contact.

[0012] In an embodiment, the connecting rod assembly comprises two spaced connecting rods, a pull rod is arranged between one end of the two connecting rods, the pull rod is rotatably connected with the two connecting rods, and the middle part of the pull rod is connected with the moving end of the vacuum arc extinguishing mechanism, the second moving contact can drive the two connecting rods to rotate, so that the pull rod triggers the vacuum arc extinguishing mechanism to open.

[0013] In an embodiment, the two ends of the pull rod pass through the two connecting rods, and the end parts of the two ends of the pull rod are respectively sleeved with shielding covers.

[0014] In an embodiment, the connecting rod assembly comprises two spaced connecting rods, a first pressing rod is fixedly connected between the two connecting rods, the second moving contact is arranged between the two connecting rods, and the middle part of the second moving contact is rotatably connected with the two connecting rods, the first side surface of the first end of the second moving contact can abut against the first pressing rod, so as to trigger the connecting rod assembly to open the vacuum arc extinguishing mechanism, and the first side surface of the second end of the second moving contact is arranged to be in conductive contact with the first moving contact.

[0015] In an embodiment, the connecting rod assembly comprises two spaced connecting rods, the second moving contact is arranged between the two connecting rods, and the middle part of the second moving contact is rotatably connected with the two connecting rods, a second pressing rod is rotatably connected between the two connecting rods, the second side surface of the second end of the second moving contact abuts against the second pressing rod, the first moving contact can be in insulating abutment against the second pressing rod to rotate the second moving contact, and the second pressing rod is connected with a reset member for resetting the second pressing rod and the second moving contact.

[0016] In an embodiment, a middle part of the second moving contact is provided with a rotating shaft, two ends of the rotating shaft are fixedly connected with the two connecting rods, a crank rod is rotatably arranged on the rotating shaft, the second pressing rod is connected with the crank rod, the crank rod is connected with the second moving contact, the reset member is sleeved on the rotating shaft, and the reset member is connected with the connecting rods and the crank rod respectively.

[0017] In an embodiment, the second moving contact is in a triangular structure, a middle part of the second moving contact is rotatably connected with the connecting rod assembly, one corner of the second moving contact is arranged to drive the connecting rod assembly to trigger the vacuum arc extinguishing mechanism to open, and another corner of the second moving contact is arranged to be in conductive contact with the first moving contact.

[0018] In an embodiment, a flexible conductive member is connected between the second moving contact and the vacuum arc extinguishing mechanism.

[0019] In an embodiment, the load switch further comprises a closed static contact arranged on a first side of the second moving contact, and the closed static contact is arranged in correspondence with the first moving contact.

[0020] In the closed position of the load switch, the first moving contact is in conductive contact with the closed static contact.

[0021] In the process of moving from the closed position to the open position of the load switch, the first moving contact has a position in conductive contact with the closed static contact and the second moving contact, and has a position in conductive contact with the second moving contact and separated from the closed static contact.

[0022] In a second aspect, a ring network cabinet is provided, comprising a cabinet body and the load switch according to any one of the above embodiments, and the load switch is arranged in the cabinet body. BRIEF DESCRIPTION OF DRAWINGS

[0023] FIG. 1 is a structural schematic diagram of the load switch from a first perspective according to an embodiment of the present application;

[0024] FIG. 2 is an enlarged structural schematic diagram of A in FIG. 1;

[0025] FIG. 3 is a structural schematic diagram of the load switch from a second perspective according to an embodiment of the present application;

[0026] FIG. 4 is a state diagram of the load switch in a closed position according to an embodiment of the present application;

[0027] FIG. 5 is a state diagram of the first moving contact of the load switch in conductive contact with the closed static contact and the second moving contact according to an embodiment of the present application;

[0028] Fig. 6 is a state diagram of the first moving contact of the load switch only contacting the second moving contact according to an embodiment of the present application;

[0029] Fig. 7 is a state diagram of the load switch in an open position according to an embodiment of the present application;

[0030] Fig. 8 is a first position diagram of the first moving contact of the load switch in insulation contact with the connecting rod assembly during closing according to an embodiment of the present application;

[0031] Fig. 9 is a second position diagram of the first moving contact of the load switch in insulation contact with the connecting rod assembly during closing according to an embodiment of the present application;

[0032] Fig. 10 is a partial structure diagram of a part of the connecting rod assembly according to an embodiment of the present application;

[0033] Fig. 11 is a partial structure diagram of another part of the connecting rod assembly according to an embodiment of the present application;

[0034] Fig. 12 is a structure diagram of the second moving contact according to an embodiment of the present application.

[0035] In the drawings:

[0036] 1, first moving contact; 2, vacuum arc extinguishing mechanism; 3, transmission mechanism; 4, contact seat; 5, main bus; 6, closed static contact; 7, grounding static contact; 8, branch bus;

[0037] 31, connecting rod assembly; 311, connecting rod; 312, pull rod; 313, shielding cover; 314, first pressing rod; 315, second pressing rod; 316, reset member; 317, crank arm; 32, second moving contact; 321, mounting groove; 33, rotating shaft; 34, flexible conductive member. DETAILED DESCRIPTION

[0038] The present application will be described in detail below with reference to the drawings and embodiments. The embodiments described herein are merely intended to explain the present application, but not to limit the present application. For the purpose of description, only parts related to the present application are shown in the drawings, but not all structures.

[0039] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the meaning of the above terms in the present application can be understood according to the situation.

[0040] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. The first feature is "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than the horizontal height of the second feature.

[0041] In the description of the present embodiment, the terms "upper", "lower", "right", "left", etc. orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0042] As shown in FIGS. 1-3, the present embodiment provides a load switch having a closed position and an open position. The load switch includes a first moving contact 1, a vacuum arc-extinguishing mechanism 2 and a transmission mechanism 3. The first moving contact 1 is rotatably arranged, and the vacuum arc-extinguishing mechanism 2 is arranged correspondingly to the first moving contact 1. The transmission mechanism 3 includes a link assembly 31, one end of the link assembly 31 is connected with a moving end of the vacuum arc-extinguishing mechanism 2, and the other end of the link assembly 31 is rotatably arranged with a second moving contact 32, the second moving contact 32 is conductively connected with the vacuum arc-extinguishing mechanism 2, in the closed position, the first moving contact 1 is placed on a first side of the second moving contact 32, and in the open position, the first moving contact 1 is placed on a second side of the second moving contact 32. In the process of moving the load switch from the closed position to the open position, the first moving contact 1 can be conductively contacted with the second moving contact 32 by rotating in a first direction, and the second moving contact 32 is rotated to drive the link assembly 31 to trigger the vacuum arc-extinguishing mechanism 2 to break, and the first moving contact 1 can pass through the second moving contact 32 and be placed on the second side of the second moving contact 32. In the process of moving the load switch from the open position to the closed position, the first moving contact 1 can be insulatively contacted with the link assembly 31 by rotating in a second direction, and the second moving contact 32 is rotated, and the first moving contact 1 can pass through the second moving contact 32 and be placed on the first side of the second moving contact 32.

[0043] It should be explained that the first moving contact 1 rotating in the first direction is to realize the opening operation of the load switch, and the second moving contact 32 rotating in the second direction is to realize the closing operation of the load switch, and the first direction is opposite to the second direction.

[0044] The vacuum arc-extinguishing mechanism 2 is in conductive connection with the second movable contact 32. During the opening process of the load switch, the first movable contact 1 is in conductive contact with the second movable contact 32 when rotating in the first direction, so that the first movable contact 1, the second movable contact 32 and the vacuum arc-extinguishing mechanism 2 form a conductive loop. The first movable contact 1 drives the vacuum arc-extinguishing mechanism 2 to open by the transmission mechanism 3, and the vacuum arc-extinguishing mechanism 2 can extinguish arc without an additional operation mechanism for opening the vacuum arc-extinguishing mechanism 2, thereby reducing the cost. During the closing process of the load switch, the first movable contact 1 is in insulating contact with the connecting rod assembly 31 when rotating in the second direction, so that the second movable contact 32 rotates. At this time, the first movable contact 1, the second movable contact 32 and the vacuum arc-extinguishing mechanism 2 cannot form a conductive loop, and the first movable contact 1 can only pass through the second movable contact 32 to perform the closing operation. The structure is arranged such that the vacuum arc-extinguishing mechanism 2 is connected in parallel to the main loop of the load switch during the opening and closing processes. The vacuum arc-extinguishing mechanism 2 only functions during the opening process of the load switch. The vacuum arc-extinguishing mechanism 2 does not need to have short-circuit closing capability, short-time current resistance capability, peak current resistance capability and continuous current resistance capability, but only needs to have rated load current breaking capability and can withstand the transient recovery voltage during breaking, thereby realizing the miniaturization and low cost of the vacuum arc-extinguishing mechanism 2 and enabling the reasonable layout in the ring network cabinet.

[0045] The load switch has three position states of closing, opening and grounding, and realizes three functions of circuit closing, circuit opening and circuit grounding. In order to realize the above three functions, the load switch further comprises a contact seat 4, a main bus 5, a closing static contact 6 and a grounding static contact 7. The contact seat 4 is arranged corresponding to the first movable contact 1, and the first movable contact 1 is rotatably arranged on the contact seat 4. The main bus 5 is arranged corresponding to the first movable contact 1, and the main bus 5 is in conductive connection with the corresponding vacuum arc-extinguishing mechanism 2. The closing static contact 6 is arranged corresponding to the first movable contact 1, and each closing static contact 6 is in conductive connection with the corresponding main bus 5 through a branch bus 8. The closing static contact 6 is arranged to be in contact with the corresponding first movable contact 1 to close. The grounding static contact 7 is arranged to be in contact with the first movable contact 1 to ground.

[0046] The first movable contact 1 is in contact with the fixed contact 6, and the contact seat 4, the first movable contact 1, the fixed contact 6, the branch bus 8 and the main bus 5 form a main circuit. The first movable contact 1 is separated from the fixed contact 6, and the first movable contact 1 is in contact with the second movable contact 32, and the contact seat 4, the first movable contact 1, the second movable contact 32, the vacuum arc extinguishing mechanism 2 and the main bus 5 form a parallel circuit. As shown in FIG. 4, the first movable contact 1 is in contact with the fixed contact 6, the main circuit is turned on, the closing of the load switch is realized, the load current flows through the main circuit, the parallel circuit is turned off, and I in FIG. 4 represents the flow direction of the current. As shown in FIG. 5, the first movable contact 1 is gradually separated from the fixed contact 6 by rotating in the first direction, and in the separation process, the first movable contact 1 is in contact with both the fixed contact 6 and the second movable contact 32, at this time, the main circuit and the parallel circuit are both turned on, the load current flows through the main circuit and the parallel circuit respectively, and I1 in FIG. 5 represents the flow direction of the current flowing through the main circuit, and I2 represents the flow direction of the current flowing through the parallel circuit. As shown in FIG. 6, with the first movable contact 1 continuing to rotate in the first direction, the first movable contact 1 is completely separated from the fixed contact 6, and the first movable contact 1 is only in conductive contact with the second movable contact 32, at this time, the main circuit is turned off, the parallel circuit is turned on, the load current flows through the parallel circuit, and the second movable contact 32 rotates to trigger the vacuum arc extinguishing mechanism 2 to open, so that the vacuum arc extinguishing mechanism 2 realizes arc extinguishing. Since the vacuum arc extinguishing mechanism 2 has the functions of breaking the load current and extinguishing the arc, and the load current has been transferred to the parallel circuit at the moment before the vacuum arc extinguishing mechanism 2 opens, therefore, the arc generated in the circuit opening process is all extinguished by the vacuum arc extinguishing mechanism 2, and the entire circuit can realize reliable opening. As shown in FIG. 7, after the vacuum arc extinguishing mechanism 2 opens, the first movable contact 1 continues to rotate in the first direction until the load switch is completely in the open position. In this process, after the first movable contact 1 is completely separated from the second movable contact 32, the force exerted by the first movable contact 1 on the second movable contact 32 disappears, and the vacuum arc extinguishing mechanism 2 restores to the closed state under the action of its own self-closing force, and drives the linkage assembly 31 to reset, and then drives the second movable contact 32 to reset, at this time, the transmission mechanism 3 and the vacuum arc extinguishing mechanism 2 can both restore to the initial state. The first movable contact 1 can continue to rotate in the first direction to connect with the grounded contact 7, so that the load switch is in the grounded position.

[0047] As shown in FIGS. 8 and 9, when the circuit needs to be closed, the load switch needs to be switched from the open position to the closed position. In this process, the first movable contact 1 rotates in the second direction, the second movable contact 32 first makes insulating contact with the linkage assembly 31, at this time, the parallel circuit is not turned on, and the insulating contact between the second movable contact 32 and the linkage assembly 31 can make the second movable contact 32 rotate, and then the first movable contact 1 can pass the second movable contact 32 to make contact with the fixed contact 6, the load switch is in the closed position, and then the closing of the circuit is realized.

[0048] Continuing to refer to FIG. 1, the load switch is generally a three-position load switch, and therefore, the first moving contact 1, the contact seat 4, the main bus 5, the closed static contact 6, and the vacuum arc-extinguishing mechanism 2 are each provided with three.

[0049] In combination with FIGS. 2 and 10, in some embodiments, the link assembly 31 includes two spaced-apart links 311, one end of each of the two links 311 is provided with a pull rod 312, the pull rod 312 is rotationally connected with the two links 311, and the middle portion of the pull rod 312 is connected with the moving end of the vacuum arc-extinguishing mechanism 2. The link 311 is rotatable relative to the pull rod 312, and when the second moving contact 32 rotates, the link 311 is driven to rotate, and after the link 311 rotates to a certain angle, a force is applied to the pull rod 312, the movement of the pull rod 312 drives the moving end of the vacuum arc-extinguishing mechanism 2 to move, thereby triggering the vacuum arc-extinguishing mechanism 2 to open. Alternatively, the pull rod 312 has a T-shaped structure, each of the two links 311 is provided with a long hole, the two ends of the horizontal rod of the pull rod 312 are rotationally connected with the long holes of the two links 311, and the pull rod 312 is slidable along the extension direction of the long hole, and the vertical rod of the pull rod 312 is connected with the moving end of the vacuum arc-extinguishing mechanism 2, so that during the rotation of the link 311, the vertical rod of the pull rod 312 drives the moving end of the vacuum arc-extinguishing mechanism 2 to move, thereby achieving the opening of the vacuum arc-extinguishing mechanism 2.

[0050] Alternatively, the two ends of the pull rod 312 pass through the links 311, and the ends of the two ends of the pull rod 312 are respectively sleeved with shielding covers 313, and the shielding covers 313 are provided to optimize the shape of the electric field of the load switch. The shielding cover 313 is made of metal, and the shielding cover 313 can be provided in a hemispherical structure to increase the shielding area and improve the optimization effect of the electric field shape.

[0051] In some embodiments, the first pressure rod 314 is fixedly connected between the two links 311 of the link assembly 31, the second moving contact 32 is arranged between the two links 311, and the middle portion of the second moving contact 32 is rotationally connected with the two links 311, and the first side surface of the first end of the second moving contact 32 is arranged to abut against the first pressure rod 314, so that the link assembly 31 triggers the vacuum arc-extinguishing mechanism 2 to open, and the first side surface of the second end of the second moving contact 32 is arranged to be in conductive contact with the first moving contact 1. The first moving contact 1 abuts against the second end of the second moving contact 32, the first end of the second moving contact 32 is driven to rotate and apply a force to the first pressure rod 314, the link assembly 31 triggers the vacuum arc-extinguishing mechanism 2 to open, and at the same time, the parallel circuit formed by the first moving contact 1, the second moving contact 32, and the vacuum arc-extinguishing mechanism 2 is conductive, and the vacuum arc-extinguishing mechanism 2 achieves arc extinguishing.

[0052] In combination with the structure of arranging the pull rod 312 between the two connecting rods 311, when the first moving contact 1 presses the first side of the second end of the second moving contact 32, the second moving contact 32 rotates under the pressing force of the first moving contact 1, the first side of the first end of the second moving contact 32 presses and applies force to the first pressing rod 314, the first pressing rod 314 drives the connecting rod 311 to rotate relative to the pull rod 312, and after the connecting rod 311 rotates to a certain angle, the force can be applied to the pull rod 312, the movement of the pull rod 312 can drive the moving end of the vacuum arc extinguishing mechanism 2 to move, and then trigger the vacuum arc extinguishing mechanism 2 to open.

[0053] In combination with FIGS. 2 and 11, when the circuit needs to be closed, the return circuit cannot be conducted, and the first moving contact 1 can still contact the closed static contact 6 beyond the second moving contact 32. In some embodiments, the second moving contact 32 is arranged between the two connecting rods 311 of the connecting rod assembly 31, the middle part of the second moving contact 32 is rotatably connected with the connecting rod 311, the second pressing rod 315 is rotatably connected between the two connecting rods 311, the second pressing rod 315 abuts against the second side of the second end of the second moving contact 32, the first moving contact 1 can be insulated and pressed on the second pressing rod 315 to make the second moving contact 32 rotate, and the second pressing rod 315 is connected with a reset member 316 for resetting the second pressing rod 315 and the second moving contact 32. During the closing process, the first moving contact 1 rotates in the second direction to contact the second pressing rod 315, and as the first moving contact 1 continues to rotate to apply force to the second pressing rod 315, the second pressing rod 315 is forced to make the second moving contact 32 rotate, at this time, the first moving contact 1 and the second moving contact 32 are in an electrically insulated state, and the return circuit cannot be connected. As the rotation angle of the second moving contact 32 increases, the first moving contact 1 is separated from the second pressing rod 315, the first moving contact 1 passes through the second moving contact 32, and at the same time, the force applied by the first moving contact 1 to the second pressing rod 315 disappears, the second pressing rod 315 is reset under the action of the reset member 316, thereby driving the second moving contact 32 to rotate and reset, the first moving contact 1 contacts the closed static contact 6 to realize the closing of the load switch, and then realize the closing and conduction of the entire circuit.

[0054] In combination with FIGS. 2, 10 and 11, in combination with the structure of arranging the pull rod 312 and the first pressing rod 314 on the connecting rod 311, when the second pressing rod 315 is subjected to the force applied by the first moving contact 1, the second pressing rod 315 transmits the force to the second side of the second end of the second moving contact 32, the second moving contact 32 rotates, the first side of the first end of the second moving contact 32 is separated from the first pressing rod 314, the connecting rod 311 will not rotate relative to the pull rod 312, thereby cannot drive the pull rod 312 to move, and the vacuum arc extinguishing mechanism 2 cannot realize opening. The process of opening the load switch is referred to the above, and will not be described here.

[0055] The second pressing rod 315 is made of nylon or other insulating materials to realize the electrical insulation between the first moving contact 1 and the second moving contact 32.

[0056] Optionally, the middle part of the second moving contact 32 is provided with a rotating shaft 33, the second moving contact 32 can rotate around the rotating shaft 33, the two ends of the rotating shaft 33 are fixedly connected with two connecting rods 311, a crank rod 317 is rotatably arranged on the rotating shaft 33, the second pressing rod 315 is connected with the crank rod 317, the crank rod 317 is connected with the second moving contact 32, and a reset member 316 is sleeved on the rotating shaft 33 and connected with the connecting rod 311 and the crank rod 317 respectively. The second pressing rod 315 can drive the second moving contact 32 and the crank rod 317 to rotate around the rotating shaft 33, when the second pressing rod 315 is not subjected to external force, the reset member 316 resets the crank rod 317, thereby driving the second pressing rod 315 and the second moving contact 32 to rotate and reset around the rotating shaft 33, and the rotating direction of the second moving contact 32 during resetting is opposite to the rotating direction of the second moving contact 32 when the second pressing rod 315 is subjected to force.

[0057] The crank rod 317 is provided with two, the two crank rods 317 are arranged on the opposite sides of the second moving contact 32, the two ends of the second pressing rod 315 are connected with the two crank rods 317, and one reset member 316 is arranged between each of the crank rod 317 and the connecting rod 311, so as to improve the resetting capability of the second pressing rod 315 and the second moving contact 32. The crank rod 317 is made of nylon or other insulating materials, so as to improve the insulation performance of the second pressing rod 315 and the first moving contact 1.

[0058] Optionally, the crank rod 317 is fixedly connected with the second moving contact 32, so as to realize the synchronism of the rotation of the crank rod 317 and the second moving contact 32. For example, one of the crank rod 317 and the second moving contact 32 is provided with a mounting groove 321, and the other is provided with a mounting protrusion which is inserted into the mounting groove 321. The mounting groove 321 can be a polygonal mounting groove, such as a triangular, quadrangular, pentagonal and the like, the shape of the mounting protrusion is matched with the shape of the mounting groove 321, the mounting protrusion and the mounting groove 321 cannot rotate relatively, the second side surface of the second end of the second pressing rod 315 and the second moving contact 32 abuts, and the synchronous rotation of the crank rod 317 and the second moving contact 32 can be realized.

[0059] The reset member 316 includes a torsion spring, the torsion spring is sleeved on the rotating shaft 33, and the two ends of the torsion spring abut on the crank rod 317 and the connecting rod 311 respectively. When the first moving contact 1 applies force on the second pressing rod 315, the torsion spring deforms and accumulates elastic force, when the first moving contact 1 is separated from the second pressing rod 315, the torsion spring releases the accumulated elastic force to reset the second pressing rod 315.

[0060] In combination with FIG. 2 and FIG. 12, the second moving contact 32 is triangular in structure, the middle part of the second moving contact 32 is rotationally connected with the connecting rod assembly 31, one of the corners of the second moving contact 32 is configured to drive the connecting rod assembly 31 to trigger the vacuum arc extinguishing mechanism 2 to open, the first side of the other corner of the second moving contact 32 is configured to be in conductive contact with the first moving contact 1, and the second side of the other corner of the second moving contact 32 is configured to be in contact with the second pressing rod 315, that is, the part of the second moving contact 32 in contact with the first moving contact 1 can be selected as an acute angle structure, and therefore the triangular structure of the second moving contact 32 is the optimal structure. The material of the second moving contact 32 is cast copper or cast aluminum or other metal conductive materials, which are not limited herein.

[0061] The second moving contact 32 is connected with the vacuum arc extinguishing mechanism 2 through a flexible conductive piece 34 to realize the conductive connection between the second moving contact 32 and the vacuum arc extinguishing mechanism 2. In the rotation process of the second moving contact 32, the flexible conductive piece 34 can be deformed, and the flexible conductive piece 34 can change with the position of the second moving contact 32 to ensure the stability of the connection between the flexible conductive piece 34 and the second moving contact 32 and the vacuum arc extinguishing mechanism 2, and the flexible conductive piece 34 will not be disconnected from the second moving contact 32 or the vacuum arc extinguishing mechanism 2.

[0062] Optionally, the material of the flexible conductive piece 34 is a metal material with excellent conductive performance, which can be copper material, which is not limited herein. Exemplarily, the flexible conductive piece 34 is a copper braid, and when connected with the second moving contact 32, the second moving contact 32 needs to have a flat surface, and therefore the triangular structure of the second moving contact 32 can meet the connection requirement of the flexible conductive piece 34. Since the duration of the complete transfer of the load current to the loop is very short, the flexible conductive piece 34 and the second moving contact 32 with appropriate resistance can be selected through calculation to meet the current stability requirement of the loop.

[0063] The embodiment also provides a ring netowrk cabinet, which comprises a cabinet body and the load switch described above, and the load switch is arranged in the cabinet body. When the load switch is opened, the vacuum arc extinguishing mechanism 2 is used for arc extinguishing instead of SF6 gas, and the ring network cabinet has the performance of environmental protection.

Claims

A load switch has a closed position and an open position, and comprises: a first movable contact, which is rotatably arranged; a vacuum arc extinguishing mechanism, which is arranged corresponding to the first movable contact; a transmission mechanism, which comprises a link assembly, one end of the link assembly is connected with a movable end of the vacuum arc extinguishing mechanism, the other end of the link assembly is rotatably arranged with a second movable contact, the second movable contact is conductively connected with the vacuum arc extinguishing mechanism, in the closed position, the first movable contact is arranged on a first side of the second movable contact, in the open position, the first movable contact is arranged on a second side of the second movable contact; during the movement of the load switch from the closed position to the open position, the first movable contact can be conductively contacted with the second movable contact by rotating in a first direction, and the second movable contact is rotated to drive the link assembly to trigger the vacuum arc extinguishing mechanism to break, and the first movable contact can be arranged on the second side of the second movable contact by passing through the second movable contact; during the movement of the load switch from the open position to the closed position, the first movable contact can be insulatively contacted with the link assembly by rotating in a second direction, and the second movable contact is rotated, and the first movable contact can be arranged on the first side of the second movable contact by passing through the second movable contact. The load switch according to claim 1, wherein The link assembly comprises two spaced link rods, a pull rod is arranged between one end of the two link rods, the pull rod is rotatably connected with the two link rods, and the middle part of the pull rod is connected with the movable end of the vacuum arc extinguishing mechanism, the second movable contact can drive the two link rods to rotate, so that the pull rod triggers the vacuum arc extinguishing mechanism to open. The load switch according to claim 2, wherein Both ends of the pull rod pass through the two link rods, and the ends of the pull rod are respectively sleeved with shielding covers. The load switch according to claim 1, wherein The link assembly comprises two spaced link rods, a first pressing rod is fixedly connected between the two link rods, the second movable contact is arranged between the two link rods, and the middle part of the second movable contact is rotatably connected with the two link rods, the first side surface of the first end of the second movable contact can abut against the first pressing rod, so as to trigger the link assembly to open the vacuum arc extinguishing mechanism, and the first side surface of the second end of the second movable contact is arranged to conductively contact with the first movable contact. The load switch according to claim 1, wherein The link assembly comprises two spaced link rods, the second movable contact is arranged between the two link rods, and the middle part of the second movable contact is rotatably connected with the two link rods, a second pressing rod is rotatably connected between the two link rods, the second side surface of the second end of the second movable contact abuts against the second pressing rod, the first movable contact can be insulatively abutted against the second pressing rod to rotate the second movable contact, and the second pressing rod is connected with a reset member for resetting the second pressing rod and the second movable contact. The load switch according to claim 5, wherein The middle part of the second movable contact is provided with a rotating shaft, both ends of the rotating shaft are fixedly connected with the two link rods, a crank rod is rotatably arranged on the rotating shaft, the second pressing rod is connected with the crank rod, the crank rod is connected with the second movable contact, the reset member is sleeved on the rotating shaft, and the reset member is connected with the link rod and the crank rod respectively. The middle part of the second movable contact is provided with a rotating shaft, both ends of the rotating shaft are fixedly connected with the two link rods, a crank rod is rotatably arranged on the rotating shaft, the second pressing rod is connected with the crank rod, the crank rod is connected with the second movable contact, the reset member is sleeved on the rotating shaft, and the reset member is connected with the link rod and the crank rod respectively. The load switch according to any one of claims 1 to 6, wherein The second moving contact is triangular in structure, a middle part of the second moving contact is rotationally connected with the linkage assembly, one of the corners of the second moving contact is arranged to drive the linkage assembly to trigger the vacuum arc extinguishing mechanism to open, and the other corner of the second moving contact is arranged to be in conductive contact with the first moving contact. The load switch according to any one of claims 1 to 6, wherein A flexible conductive member is connected between the second moving contact and the vacuum arc extinguishing mechanism. The load switch according to any one of claims 1-6, further comprising a closed-position static contact arranged on a first side of the second moving contact, the closed-position static contact being arranged in correspondence with the first moving contact; In the closed position, the first moving contact is in conductive contact with the closed-position static contact. In the process of moving from the closed position to the open position, the first moving contact has a position in which it is in conductive contact with both the closed-position static contact and the second moving contact, and a position in which it is separated from the closed-position static contact and in conductive contact with the second moving contact. A ring main unit, comprising a cabinet and the load switch according to any one of claims 1-9, the load switch being arranged in the cabinet.

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