Vacuum parallel switch device and switchgear

Abstract

The utility model belongs to switch device technical field discloses a kind of vacuum shunt switch device and switch equipment. Vacuum shunt switch device includes isolating contact, vacuum arc-extinguishing mechanism, transmission mechanism and isolating knife switch. Transmission mechanism includes transmission assembly, first elastic member and limit piece, limit piece is set on insulating shell, and transmission assembly is connected with moving contact. The process of isolating knife switch rotates along first rotation direction drives transmission assembly to drive moving contact and static contact to separate, and moving contact and static contact complete separation, transmission assembly reaches balance under the joint action of first elastic member and limit piece, to make moving contact and static contact keep separation;The process of isolating knife switch rotates along second rotation direction drives transmission assembly to drive moving contact and static contact to engage, and before moving contact and static contact engage, isolating knife switch has already engaged with isolating contact. The opening and closing operation safety of this vacuum shunt switch device is better.

Description

Technical Field

[0001] This utility model relates to the field of switching device technology, and in particular to a vacuum parallel switching device and switching equipment. Background Technology

[0002] SF6 gas has excellent arc-quenching and insulation properties and is widely used in medium and high voltage switchgear. However, SF6 is a strong greenhouse gas and produces toxic gases during the switching process. Therefore, it has been gradually replaced by air. However, air has poor insulation properties, making it difficult to extinguish the arc generated when the switch is opened. The intense combustion of the arc can easily lead to a fire risk.

[0003] Therefore, load switch breaking schemes widely adopt a parallel connection of vacuum interrupters and disconnectors, while using environmentally friendly gas (air) insulation. In this scheme, current flows normally through the disconnector when closing, and is interrupted by the vacuum interrupter when opening, effectively extinguishing the arc. During the opening and closing process of the load switch, the actuation of the vacuum interrupter usually relies on the cooperation between the disconnector and the transmission mechanism. Traditional transmission mechanisms only have simple transmission functions. When the disconnector separates from the transmission mechanism, the vacuum interrupter will engage under the action of self-closing force. This poses a risk of discharge when the disconnector rotates to a position close to the transmission mechanism during closing.

[0004] Therefore, there is an urgent need to propose a vacuum parallel switch device and switching equipment to solve the above-mentioned technical problems. Utility Model Content

[0005] According to one aspect of the present invention, the present invention provides a vacuum parallel switch device, which can transfer current to a vacuum arc-extinguishing mechanism through a transmission mechanism for arc extinguishing, thereby improving the safety and reliability of the opening operation. Furthermore, it can achieve opening retention after vacuum arc extinguishing, avoiding the risk of discharge between the isolating switch and the transmission mechanism, and improving the safety and reliability of the closing operation.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Vacuum parallel switching device, including:

[0008] Isolation contacts;

[0009] The isolating switch is rotatable in a first rotational direction to disengage from and move away from the isolating contact, and is rotatable in a second rotational direction to approach and engage with the isolating contact;

[0010] A vacuum interrupting mechanism includes an insulating shell and a vacuum interrupting chamber installed inside the insulating shell. The vacuum interrupting chamber is provided with a stationary contact and a moving contact, and the stationary contact is electrically connected to the isolating contact.

[0011] The transmission mechanism includes a transmission component, a first elastic element, and a limiting element. The limiting element is disposed on the insulating shell. The transmission component is connected to the moving contact. When the transmission component is driven, it can drive the moving contact to move relative to the stationary contact, thereby realizing the opening and closing of the vacuum arc extinguishing mechanism.

[0012] When the isolating switch rotates along the first rotation direction, it contacts and drives the transmission assembly, causing the transmission assembly to separate the moving contact from the stationary contact. After the moving contact and the stationary contact are separated, the transmission assembly reaches a balance under the combined action of the first elastic member and the limiting member, so as to keep the moving contact and the stationary contact separated.

[0013] When the isolating switch rotates in the second rotation direction, it contacts and disturbs the transmission component, so that the transmission component drives the moving contact to gradually engage with the stationary contact until the closing is completed. Before the moving contact engages with the stationary contact, the isolating switch has already engaged with the isolating contact.

[0014] Optionally, the transmission assembly includes:

[0015] The first link has one end rotatably connected to the insulating housing, and the middle part of the first link is hinged to the moving contact;

[0016] The second link has one end hinged to the other end of the first link;

[0017] A rotating component, the other end of the second connecting rod is hinged to the rotating component, the rotating component is rotatably connected to the insulating shell, one end of the first elastic element is connected to the insulating shell, and the other end is connected to the side of the rotating component away from the second connecting rod;

[0018] During the rotation of the isolating switch along the first rotation direction, it can drive the rotating component to rotate, so that the rotating component drives the first connecting rod to rotate through the second connecting rod, thereby causing the first connecting rod to pull the moving contact and the stationary contact to gradually separate. After the moving contact and the stationary contact are separated, the second connecting rod or the rotating component abuts against the limiting component.

[0019] As the isolating switch rotates along the second rotation direction, it can drive the rotating component to rotate, causing the rotating component to drive the first connecting rod to rotate via the second connecting rod, thereby causing the first connecting rod to pull the moving contact and the stationary contact to gradually engage.

[0020] Optionally, a guiding hole is provided on the rotating member, and a first pin shaft is provided at one end of the second connecting rod connected to the rotating member. The first pin shaft is slidably connected to the guiding hole. During the process that the isolating switch rotates along the first rotation direction from contacting the rotating member to separating from the isolating contact, the first pin shaft slides in the guiding hole without actuating the second connecting rod.

[0021] Optionally, a conductive support arm and an insulating support arm are provided on the rotating member. The other end of the second connecting rod is hinged to the conductive support arm. During the process that the isolating switch rotates along the first rotation direction, it cooperates with the conductive support arm. During the process that the isolating switch rotates along the second rotation direction, it cooperates with the insulating support arm.

[0022] Optionally, the rotating member is in a "U" shape like a storage cabinet, and the conductive support arm and the insulating support arm are arranged to be of unequal lengths.

[0023] Optionally, the rotating member includes a conductive support and an insulating support; a connecting column is provided at one end of the conductive support, a first connecting hole penetrating along its thickness direction is provided at the end of the conductive support where the connecting column is provided, and the conductive support arm is provided at the other end of the conductive support;

[0024] A slot is provided at one end of the insulating support for inserting the connecting column. On the insulating support, connecting ears are provided on opposite sides of the slot. Second connecting holes are provided on the connecting ears. The end of the conductive support where the first connecting hole is provided is clamped between the two connecting ears, and the first connecting hole and the two second connecting holes are correspondingly arranged;

[0025] Two spaced connecting plates are provided on the insulating housing. The two connecting plates are respectively connected to both ends of the second pin shaft. The second pin shaft penetrates through the first connecting hole and the two second connecting holes, and the rotating member can rotate around the second pin shaft.

[0026] Optionally, two connecting support arms are further provided on the insulating support. The two connecting support arms are respectively arranged on opposite sides of the insulating support. A first elastic member is correspondingly provided for each connecting support arm. One end of the first elastic member is connected to the connecting support arm, and the other end is connected to the insulating housing.

[0027] Optionally, the transmission mechanism further includes a second elastic member. One end of the second elastic member is connected to the insulating housing, and the other end is connected to the transmission component. The second elastic member is configured to always have a tendency to drive the transmission component to drive the moving contact to engage with the static contact.

[0028] Optionally, the isolating switch is connected to the isolating spindle, the isolating spindle is used to drive the isolating switch to rotate, and an insulating protective cover is provided over the isolating spindle and part of the isolating switch.

[0029] According to another aspect of the present invention, the present invention provides a switching device, including a cabinet and a vacuum parallel switch device as described in any of the above technical solutions, wherein the vacuum parallel switch device is disposed in the cabinet.

[0030] The beneficial effects of this utility model are:

[0031] This utility model provides a vacuum parallel switch device, including an isolating contact, a vacuum arc-extinguishing mechanism, a transmission mechanism, and an isolating switch. During the process of the isolating switch rotating in a first rotation direction and disengaging from the isolating contact, the isolating switch first contacts the transmission component, transferring current through the transmission component to the vacuum arc-extinguishing mechanism. The transmission mechanism then drives the moving contact in the vacuum arc-extinguishing mechanism to gradually separate from the stationary contact, causing an arc to be generated within the vacuum arc-extinguishing chamber. This arc is extinguished by vacuum, improving the safety and reliability of the opening operation. As the isolating switch rotates further, the moving contact moves to a position away from the stationary contact. Then, the transmission component reaches equilibrium under the action of the first elastic element and the limiting element, meaning the transmission component remains stationary, thus maintaining the opening of the vacuum arc-extinguishing mechanism. This opening state is only released after the isolating switch rotates in a second rotation direction to close with the isolating contact. With this configuration, when the isolating switch rotates to a position close to the vacuum arc-extinguishing mechanism during the closing operation, there will be no discharge between them because the vacuum arc-extinguishing mechanism is in an open state, improving the safety and reliability of the closing operation.

[0032] The transmission components are restricted by the cooperation of the first elastic element and the limiting element, which makes the reliability of the vacuum arc extinguishing mechanism in holding the circuit breaker better.

[0033] During the process of the isolating switch rotating in the second rotation direction to drive the transmission assembly, the transmission assembly can be simultaneously driven by the first elastic element and the isolating switch to push the moving contact to engage with the stationary contact, reducing the risk of vacuum arc extinguishing mechanism failure to close.

[0034] This utility model also provides a switchgear, including a cabinet and the aforementioned vacuum parallel switch device. Because this switchgear uses the aforementioned vacuum parallel switch device, its opening and closing operations have better safety and reliability. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0036] Figure 1 A schematic diagram of the structure of the vacuum parallel switch device provided in the embodiment of this utility model;

[0037] Figure 2 for Figure 1 Enlarged view at point A;

[0038] Figure 3 A schematic diagram illustrating the cooperation between the vacuum arc-extinguishing mechanism and the transmission mechanism provided in an embodiment of this utility model;

[0039] Figure 4 This is a schematic diagram of the structure of the rotating component provided in an embodiment of the present utility model;

[0040] Figure 5 An exploded view of the rotating component from one perspective, as provided in an embodiment of this utility model;

[0041] Figure 6 An exploded view of the rotating component from another perspective, as provided in an embodiment of this utility model;

[0042] Figures 7-11 A schematic diagram of the opening process of the vacuum parallel switch device provided in this embodiment of the utility model;

[0043] Figures 12-15 A schematic diagram of the closing process of the vacuum parallel switch device provided in this embodiment of the utility model.

[0044] In the picture:

[0045] 10. Main busbar; 20. Isolation spindle; 30. Bushing;

[0046] 100. Isolation contacts;

[0047] 200. Vacuum arc-extinguishing mechanism; 210. Insulating shell; 211. Connecting plate; 212. Second pin; 213. Support plate; 220. Stationary contact; 230. Moving contact;

[0048] 300. Transmission mechanism; 310. Transmission assembly; 311. First connecting rod; 312. Second connecting rod; 313. Rotating component; 3130. Guide hole; 3131. Conductive support; 31311. Conductive support arm; 31312. Connecting post; 31313. First connecting hole; 3132. Insulating support; 31321. Insulating support arm; 31322. Slot; 31323. Connecting ear; 31324. Second connecting hole; 3133. Connecting support arm; 320. First elastic element; 330. Limiting element; 340. First pin; 350. Second elastic element;

[0049] 400. Isolating switch;

[0050] 500. Insulating protective cover. Detailed Implementation

[0051] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0052] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0053] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0054] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0055] This embodiment provides a vacuum parallel switch device that can transfer current to a vacuum arc-extinguishing mechanism through a transmission mechanism for arc extinguishing, thereby improving the safety and reliability of the opening operation. It can also maintain the opening after vacuum arc extinguishing, avoiding the risk of discharge between the isolating switch and the transmission mechanism, and improving the safety and reliability of the closing operation.

[0056] Specifically, such as Figures 1-3 , Figures 7-15 As shown, the vacuum parallel switchgear includes an isolating contact 100, a vacuum arc extinguishing mechanism 200, a transmission mechanism 300, and an isolating knife switch 400.

[0057] The isolating switch 400 is rotatable in a first rotation direction to disengage from and move away from the isolating contact 100, and is rotatable in a second rotation direction to approach and engage with the isolating contact 100. It is understood that when the isolating switch 400 engages with the isolating contact 100, the main circuit current is conducted, and the vacuum parallel switch device achieves closing; when the isolating switch 400 disengages from the isolating contact 100, the main circuit current is disconnected. It is understood that the first rotation direction and the second rotation direction are opposite. In this embodiment, the first rotation direction is counterclockwise, and the second rotation direction is clockwise.

[0058] The vacuum arc-extinguishing mechanism 200 includes an insulating housing 210 and a vacuum arc-extinguishing chamber installed within the insulating housing 210. The vacuum arc-extinguishing chamber contains a stationary contact 220 and a moving contact 230, with the stationary contact 220 electrically connected to the isolating contact 100. When the vacuum parallel switchgear is opened, the current is transferred to the vacuum arc-extinguishing mechanism 200 via the isolating switch 400, and the vacuum arc-extinguishing mechanism 200 extinguishes the arc generated during opening, ensuring operational safety even when air is used as the insulating gas. Optionally, in one possible embodiment, the stationary contact 220 can be electrically connected to the isolating contact 100 via the main busbar 10, meaning both the stationary contact 220 and the isolating contact 100 are electrically connected to the main busbar 10. It is worth noting that the insulating housing 210 serves as an insulating mounting bracket for fixing the vacuum arc-extinguishing mechanism 200.

[0059] The transmission mechanism 300 includes a transmission assembly 310, a first elastic element 320, and a limiting element 330. The limiting element 330 is disposed on the insulating housing 210, and the transmission assembly 310 is connected to the moving contact 230. The transmission assembly 310 is used to drive the moving contact 230 to separate or engage with the stationary contact 220 under external force, thereby realizing the opening or closing of the vacuum arc-extinguishing mechanism 200. The limiting element 330 is used to abut against the transmission assembly 310 to restrict the movement of the transmission assembly 310. The first elastic element 320 is used to hold the transmission assembly 310 in the position abutting against the limiting element 330, and to assist the transmission assembly 310 in driving the moving contact 230 to engage with the stationary contact 220.

[0060] The working principle of this vacuum parallel switch device is as follows:

[0061] Isolating switch 400 along the first rotation direction ( Figure 1 During the process of rotating counterclockwise and disengaging from the isolating contact 100, the isolating switch 400 first contacts the transmission component 310, transferring the current to the vacuum arc-extinguishing mechanism 200 through the transmission component 310. Then, by driving the transmission component 310 to move, the transmission component 310 pulls the moving contact 230 and the stationary contact 220 in the vacuum arc-extinguishing mechanism 200 to gradually separate. When the moving contact 230 and the stationary contact 220 separate, an electric arc is generated. Since the electric arc is generated in the vacuum arc-extinguishing chamber, it can be reliably extinguished by vacuum. Compared with the prior art where the electric arc is generated between the isolating switch 400 and the isolating contact 100 and is extinguished by air, the arc extinguishing effect is better, improving the safety and reliability of the opening operation of the vacuum parallel switch device. Furthermore, after the moving contact 230 and the stationary contact 220 are separated, the transmission assembly 310 reaches a balance under the combined action of the first elastic member 320 and the limiting member 330. That is, the transmission assembly 310 remains stationary, thereby keeping the moving contact 230 connected to the transmission assembly 310 in the open position with the stationary contact 220, so that the vacuum arc extinguishing mechanism 200 can always remain in the open state.

[0062] Isolating switch 400 along the second rotation direction ( Figure 1During the clockwise rotation process of the isolating switch 400 engaging with the isolating contact 100, the isolating switch 400 can re-engage with the transmission component 310 to agitate the transmission component 310, thereby driving the transmission component 310 to move. This causes the transmission component 310 to gradually engage the moving contact 230 with the stationary contact 220 until the closing operation is completed. Furthermore, before the moving contact 230 engages with the stationary contact 220, the isolating switch 400 has already engaged with the isolating contact 100. In other words, the open state of the vacuum arc-extinguishing mechanism 200 is not released until the isolating switch 400 engages with the isolating contact 100. With this configuration, when the isolating switch 400 rotates to a position close to the vacuum arc-extinguishing mechanism 200 during the closing operation, there will be no discharge between the isolating switch 400 and the vacuum arc-extinguishing mechanism 200 because the vacuum arc-extinguishing mechanism 200 is in the open state. This improves the safety and reliability of the vacuum parallel switch device during closing.

[0063] Understandably, the first elastic element 320 can also drive the moving contact 230 to gradually approach the stationary contact 220 through the elastic drive transmission component 310, so that the moving contact 230 can quickly engage with the stationary contact 220, reducing the risk of the vacuum arc extinguishing mechanism 200 failing to close.

[0064] The movement of the transmission assembly 310 is restricted by the first elastic element 320 and the limiting element 330, which makes the reliability of the vacuum arc extinguishing mechanism 200 in holding the circuit breaker better.

[0065] Optionally, in one possible embodiment, the moving contact 230 inside the vacuum interrupter chamber can engage with the stationary contact 220 under the action of a self-closing force when not subjected to external force. Therefore, during the rotation of the isolating switch 400 in the second rotation direction, the moving contact 230 can be simultaneously driven by the transmission component 310 and the self-closing force to engage with the stationary contact 220, reducing the risk of the vacuum interrupter mechanism 200 failing to close.

[0066] Optionally, see [link to relevant documentation] Figures 1-3 The transmission assembly 310 includes a first connecting rod 311, a second connecting rod 312, and a rotating member 313. One end of the first connecting rod 311 is rotatably connected to the insulating housing 210, and its middle portion is hinged to the moving contact 230. One end of the second connecting rod 312 is hinged to the other end of the first connecting rod 311, and the other end of the second connecting rod 312 is hinged to the rotating member 313. The rotating member 313 is rotatably connected to the insulating housing 210 and engages with the rotating member 313 during rotation of the isolating switch 400 along a first or second rotation direction. In this embodiment, the hinge point between the second connecting rod 312 and the rotating member 313 is located on the side of the rotating member 313's rotation center closer to the second connecting rod 312.

[0067] Specifically, the connection between the first connecting rod 311 and the insulating housing 210 is as follows: Figure 1At point a in Figure 1, the hinge point between the first link 311 and the moving contact 230 is at point b in Figure 1, and the hinge point between the first link 311 and the second link 312 is at point b in Figure 1. Figure 1 At point c, the hinge between the second connecting rod 312 and the rotating member 313 is... Figure 1 At point d in the diagram, the connection between the rotating component 313 and the insulating shell 210 is... Figure 1 Point e in the diagram. The configuration, arrangement, and connection of the first link 311, the second link 312, and the rotating component 313 form a four-bar linkage, which is simple in structure and reliable in force transmission.

[0068] Optionally, see [link to relevant documentation] Figures 1-3 In this embodiment, one end of the first elastic member 320 is connected to the insulating shell 210, and the other end is connected to the side of the rotating member 313 away from the second connecting rod 312. That is, the hinge point d between the second connecting rod 312 and the rotating member 313 and the connection point f between the first elastic member 320 and the rotating member 313 are respectively located on both sides of the rotation center of the rotating member 313.

[0069] See also Figure 1 When the first elastic element 320 is located above the rotation center of the rotating element 313, the first elastic element 320 always has a tendency to cause the rotating element 313 to rotate along the first rotation direction closer to the insulating shell 210. (Continue to see...) Figure 11 When the first elastic element 320 is located below the rotation center of the rotating element 313, the first elastic element 320 always has the tendency to make the rotating element 313 rotate in the second rotation direction to approach the insulating shell 210.

[0070] To facilitate understanding, the working process of the transmission mechanism 300 is briefly described below (taking the first rotation direction as counterclockwise and the second rotation direction as clockwise as an example):

[0071] like Figure 1 , Figures 7-12As shown, during the counterclockwise rotation of the isolating switch 400, it first contacts the rotating component 313, driving the rotating component 313 to rotate clockwise around point e. The clockwise rotation of the rotating component 313 causes the first connecting rod 311 to rotate clockwise around point a via the second connecting rod 312. The clockwise rotation of the first connecting rod 311 pulls the moving contact 230 outward, gradually separating it from the stationary contact 220. Once the moving contact 230 and stationary contact 220 have completely separated... When the moving contact 230 moves to a distance of a specified opening distance from the stationary contact 220, the rotating member 313 or the second connecting rod 312 rotates to abut against the limiting member 330, restricting the rotating member 313 or the second connecting rod 312 from continuing to rotate. At this time, the first elastic member 320 applies a pulling force to the rotating member 313. Since the rotating member 313 or the second connecting rod 312 abuts against the limiting member 330, the first connecting rod 311, the second connecting rod 312 and the rotating member 313 can remain stationary, so as to realize the opening retention of the vacuum arc extinguishing mechanism 200.

[0072] Understandably, the position where the rotating member 313 or the second link 312 abuts against the limiting member 330 can be designed as the dead point position of the four-bar linkage formed by the first link 311, the second link 312 and the rotating member 313, in order to improve the reliability of the vacuum arc extinguishing mechanism 200 in holding the circuit breaker open.

[0073] like Figure 1 , Figures 13-15 As shown, during the clockwise rotation of the isolating switch 400, the driving rotating component 313 rotates counterclockwise around point e. This counterclockwise rotation of the rotating component 313 causes the first connecting rod 311 to rotate counterclockwise around point a via the second connecting rod 312. The counterclockwise rotation of the first connecting rod 311 pushes the moving contact 230 inward, gradually bringing it closer to the stationary contact 220 until they engage. The transmission mechanism 300 then returns to its initial position. Simultaneously, during this process, the first elastic component 320 pulls the rotating component 313 counterclockwise through its elastic restoring force. This, in turn, assists the first connecting rod 311 in quickly engaging the moving contact 230 with the stationary contact 220 via the linkage transmission principle, improving the reliability of the vacuum arc-extinguishing mechanism 200's successful closing.

[0074] In this embodiment, the second link 312 can abut against the limiting member 330.

[0075] Further, see also Figure 2 and Figure 3, a guiding hole 3130 is provided on the rotating member 313. A first pin shaft 340 is provided at one end of the second connecting rod 312 connected to the rotating member 313. The first pin shaft 340 slidably penetrates through the guiding hole 3130. During the process that the isolating switch 400 rotates in the first rotation direction and starts to contact the rotating member 313 until it separates from the isolating contact 100, the first pin shaft 340 slides in the guiding hole 3130 without actuating the second connecting rod 312, that is, the second connecting rod 312 remains stationary.

[0076] It can be understood that when the isolating switch 400 starts to contact the rotating member 313, the current starts to transfer from the main circuit connected to the isolating contact 100 to the vacuum arc extinguishing mechanism 200 until the isolating switch 400 separates from the isolating contact 100, and the main circuit current is completely transferred to the vacuum arc extinguishing mechanism 200. During this process, the first pin shaft 340 slides in the guiding hole 3130, making the second connecting rod 312 remain stationary. If the second connecting rod 312 remains stationary, the first connecting rod 311 also remains stationary, and the moving contact 230 connected to the first connecting rod 311 also remains stationary, making the vacuum arc extinguishing mechanism 200 remain in the closed state during the current transfer process, which is beneficial to improving the smoothness of the current transfer.

[0077] Further, continue to refer to Figure 2 and Figure 3 , a conductive support arm 31311 and an insulating support arm 31321 are provided on the rotating member 313. The other end of the second connecting rod 312 is hinged to the conductive support arm 31311. It can be understood that both the first connecting rod 311 and the second connecting rod 312 have conductive properties, so that the current of the isolating switch 400 can be transmitted to the moving contact 230 through the conductive support arm 31311, the second connecting rod 312 and the first connecting rod 311 in sequence.

[0078] Specifically, during the process that the isolating switch 400 rotates in the first rotation direction, it cooperates with the conductive support arm 31311, so that the current is transferred to the moving contact 230 through the conductive support arm 31311, the second connecting rod 312 and the first connecting rod 311. During the process that the isolating switch 400 rotates in the second rotation direction, it cooperates with the insulating support arm 31321 to prevent the transfer of current. In this way, the discharge risk between the isolating switch 400 and the vacuum arc extinguishing mechanism 200 can be reduced, and the closing stability is improved.

[0079] Optionally, continue to refer to Figure 1 and Figure 2 , in a possible embodiment, the rotating member 313 is in a shape similar to a "U", with a simple structure and convenient for processing. Moreover, the conductive support arm 31311 and the insulating support arm 31321 are set to be of unequal lengths. With such a setting, it is convenient for the isolating switch 400 to cooperate with the conductive support arm 31311 and the insulating support arm 31321.

[0080] Optionally, continue to refer toFigures 2-6 In one possible embodiment, the rotating component 313 includes a conductive support 3131 and an insulating support 3132. Specifically, one end of the conductive support 3131 is provided with a connecting post 31312, and the end of the conductive support 3131 with the connecting post 31312 is provided with a first connecting hole 31313 extending along its thickness direction. The other end of the conductive support 3131 is provided with a conductive arm 31311. One end of the insulating support 3132 is provided with a slot 31322 for insertion into the connecting post 31312. On the insulating support 3132, connecting ears 31323 are provided on opposite sides of the slot 31322. The connecting ears 31323 are provided with second connecting holes 31324. The end of the conductive support 3131 with the first connecting hole 31313 is sandwiched between the two connecting ears 31323, and the first connecting hole 31313 is correspondingly provided with the two second connecting holes 31324. The insulating housing 210 is provided with two spaced connecting plates 211. The two connecting plates 211 are respectively connected to the two ends of the second pin 212. The second pin 212 passes through the first connecting hole 31313 and the two second connecting holes 31324. The rotating part 313 can rotate around the second pin 212.

[0081] The conductive support 3131 and the insulating support 3132 of the rotating component 313 are connected to the slot 31322 through the insertion of the connecting post 31312 and the slot 31322, and are also connected through the second pin 212. This arrangement not only improves the connection reliability between the conductive support 3131 and the insulating support 3132, but also realizes the rotational connection between the rotating component 313 and the insulating shell 210, simplifying the component structure.

[0082] Optionally, see [link to relevant documentation] Figures 3-6 The insulating support 3132 is also provided with two connecting arms 3133, which are respectively located on opposite sides of the insulating support 3132. Each connecting arm 3133 is provided with a first elastic element 320. One end of the first elastic element 320 is connected to the connecting arm 3133, and the other end is connected to the insulating shell 210. Fixing the first elastic element 320 with the connecting arms 3133 is simple in structure and helps to improve the structural strength of the rotating part 313. Furthermore, by providing two first elastic elements 320, the uniformity of force on the rotating part 313 is improved, thereby improving the smoothness of the rotation of the rotating part 313.

[0083] Further, see also Figure 1 and Figure 3 The transmission mechanism 300 also includes a second elastic element 350, one end of which is connected to the insulating housing 210 and the other end is connected to the transmission assembly 310. The second elastic element 350 is configured to always have the tendency to drive the transmission assembly 310 to engage the moving contact 230 with the stationary contact 220.

[0084] Optionally, see [link to relevant documentation] Figure 3 In one possible embodiment, a support plate 213 is provided on the insulating housing 210. The support plate 213 is located on the side of the first connecting rod 311 away from the moving contact 230. The second elastic element 350 is a compression spring. One end of the compression spring is connected to the support plate 213, and the other end is connected to the end of the first connecting rod 311 near the second connecting rod 312.

[0085] By incorporating a second elastic element 350, the reliability of the vacuum arc-extinguishing mechanism 200 in successfully closing is further improved.

[0086] Optionally, see [link to relevant documentation] Figure 1 The isolating switch 400 is connected to the isolating spindle 20, which drives the isolating switch 400 to rotate. An insulating protective cover 500 is installed over the isolating spindle 20 and part of the isolating switch 400. The insulating protective cover 500 can strengthen the insulation and reduce the discharge risk of the isolating switch 400.

[0087] Optionally, see [link to relevant documentation] Figure 1 In this embodiment, the vacuum arc-extinguishing mechanism 200 is arranged at an angle, and the transmission mechanism 300 is located between the vacuum arc-extinguishing mechanism 200 and the isolating switch 400. This arrangement reduces the vertical space occupied by the vacuum arc-extinguishing mechanism 200 and makes the transmission mechanism 300 closer to both the vacuum arc-extinguishing mechanism 200 and the isolating switch 400, which helps to improve the structural compactness of the transmission mechanism 300.

[0088] To facilitate understanding, the working process of this vacuum parallel switch device will be briefly described below:

[0089] Opening process:

[0090] like Figure 1 As shown, the isolating switch 400 is in the position of engaging with the isolating contact 100, the main circuit is connected, and the vacuum arc extinguishing mechanism 200 is in the closed state under the action of the tension and self-closing force of the first elastic element 320.

[0091] like Figure 7 As shown, the isolating switch 400 rotates counterclockwise under the drive of the isolating spindle 20 until it contacts the conductive support arm 31311 on the rotating part 313. At this time, the isolating switch 400 partially remains in contact with the isolating contact 100. At this time, a portion of the current in the main circuit is transferred to the vacuum arc extinguishing mechanism 200 to form a parallel circuit.

[0092] like Figure 8As shown, as the isolating switch 400 rotates further counterclockwise and gradually disengages from the isolating contact 100, the isolating switch 400 pushes the conductive support arm 31311 to make the rotating member 313 rotate clockwise. The clockwise rotation of the rotating member 313 causes the first rotating shaft 340 to slide within the guide hole 3130 until the isolating switch 400 separates from the isolating contact 100 and moves to a safe distance from the isolating contact 100. Then, the wall of the guide hole 3130 abuts against the first pin 340, that is, the sliding stroke of the first pin 340 within the guide hole 3130 ends, and the main circuit current forms a single circuit state through the isolating switch 400 and the vacuum arc extinguishing mechanism 200.

[0093] like Figure 9 and Figure 10 As shown, as the isolating switch 400 rotates further counterclockwise, the isolating switch 400 continues to push the conductive support arm 31311 to make the rotating member 313 rotate clockwise. The clockwise rotation of the rotating member 313 will drive the first link 311 to rotate clockwise through the second link 312. The clockwise rotation of the first link 311 will drive the moving contact 230 to gradually move away from the stationary contact 220. During this process, the first elastic member 320 can pull the rotating member 313 to rotate clockwise through elastic force, assisting the movement of the transmission mechanism 300.

[0094] like Figure 11 As shown, as the isolating switch 400 rotates further counterclockwise, the isolating switch 400 continues to drive the rotating component 313 to rotate clockwise via the conductive support arm 31311. The moving contact 230 continues to move away from the stationary contact 220 until the second connecting rod 312 abuts against the limiting component 330. At this point, the rotating component 313 stops rotating, and the isolating switch 400 is about to separate from the conductive support arm 31311. The opening distance between the moving contact 230 and the stationary contact 220 meets the specified opening distance, and the vacuum arc extinguishing mechanism 200 achieves opening. At the same time, under the action of the first elastic component 320 and the limiting component 330, the first connecting rod 311, the second connecting rod 312 and the rotating component 313 remain stationary, thus achieving the opening and holding of the vacuum arc extinguishing mechanism 200.

[0095] like Figure 12 As shown, as the isolating switch 400 rotates further counterclockwise, the isolating switch 400 separates from the conductive support arm 31311, and the vacuum arc extinguishing mechanism 200 remains in the open state. The vacuum parallel switch device is now open.

[0096] Closing process:

[0097] like Figure 13 As shown, the isolating switch 400 rotates clockwise under the drive of the isolating spindle 20 until it contacts the insulating support arm 31321 on the rotating part 313;

[0098] like Figure 14 As shown, as the isolating switch 400 rotates further in the clockwise direction, the isolating switch 400 pushes the rotating component 313 to rotate in the counterclockwise direction through the insulating support arm 31321. The rotation of the rotating component 313 in the counterclockwise direction will drive the first connecting rod 311 to rotate in the counterclockwise direction through the second connecting rod 312. The rotation of the first connecting rod 311 in the counterclockwise direction will push the moving contact 230 and the stationary contact 220 to gradually engage. At the same time, the first elastic component 320 can also pull the rotating component 313 to rotate in the counterclockwise direction under the action of elastic restoring force.

[0099] like Figure 15 As shown, as the isolating switch 400 rotates further clockwise, it first contacts the isolating contact 100, and then continues to drive the rotating component 313 to rotate through the insulating support arm 31321 until it finally separates from the insulating support arm 31321. Then the moving contact 230 engages with the stationary contact 220. That is, the vacuum arc extinguishing mechanism 200 closes after the isolating switch 400 engages with the isolating contact 100, in order to reduce the risk of discharge between the isolating switch 400 and the vacuum arc extinguishing mechanism 200. When the isolating switch 400 rotates to its position, the vacuum parallel switch device is closed.

[0100] This embodiment also provides a switching device, including a cabinet and the aforementioned vacuum parallel switch device, wherein the vacuum parallel switch device is disposed inside the cabinet.

[0101] Because this switchgear uses the aforementioned vacuum parallel switch device, its opening and closing operations have better safety and reliability.

[0102] Optionally, see [link to relevant documentation] Figure 1 and Figure 2 In this embodiment, the two ends of the main busbar 10 are installed on the side wall of the cabinet through sleeves 30.

[0103] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A vacuum parallel switching device, characterized in that, include: Isolating contact (100); The isolating switch (400) is rotatable in a first rotational direction to disengage from and move away from the isolating contact (100), and is rotatable in a second rotational direction to approach and engage with the isolating contact (100); The vacuum interrupting mechanism (200) includes an insulating shell (210) and a vacuum interrupting chamber installed inside the insulating shell (210). The vacuum interrupting chamber is provided with a stationary contact (220) and a moving contact (230). The stationary contact (220) is electrically connected to the isolating contact (100). The transmission mechanism (300) includes a transmission component (310), a first elastic element (320), and a limiting element (330). The limiting element (330) is disposed on the insulating shell (210). The transmission component (310) is connected to the moving contact (230). When the transmission component (310) is driven, it can drive the moving contact (230) to move relative to the stationary contact (220), thereby realizing the opening and closing of the vacuum arc extinguishing mechanism (200). When the isolating switch (400) rotates along the first rotation direction, it contacts and drives the transmission assembly (310), causing the transmission assembly (310) to drive the moving contact (230) to separate from the stationary contact (220). After the moving contact (230) and the stationary contact (220) are separated, the transmission assembly (310) reaches a balance under the combined action of the first elastic member (320) and the limiting member (330), so that the moving contact (230) and the stationary contact (220) remain separated. When the isolating switch (400) rotates in the second rotation direction, it contacts and disturbs the transmission assembly (310) so that the transmission assembly (310) drives the moving contact (230) to gradually engage with the stationary contact (220) until the circuit is closed. Before the moving contact (230) engages with the stationary contact (220), the isolating switch (400) has already engaged with the isolating contact (100).

2. The vacuum parallel switch device according to claim 1, characterized in that, The transmission assembly (310) includes: The first link (311) has one end rotatably connected to the insulating shell (210), and the middle part of the first link (311) is hinged to the moving contact (230). The second link (312) has one end hinged to the other end of the first link (311); The rotating member (313) is hinged to the other end of the second connecting rod (312), and the rotating member (313) is rotatably connected to the insulating shell (210). One end of the first elastic member (320) is connected to the insulating shell (210), and the other end is connected to the side of the rotating member (313) away from the second connecting rod (312). During the rotation of the isolating switch (400) along the first rotation direction, the isolating switch (400) can drive the rotating member (313) to rotate, so that the rotating member (313) drives the first link (311) to rotate through the second link (312). Furthermore, the first link (311) pulls the moving contact (230) and the static contact (220) to gradually separate. After the moving contact (230) and the static contact (220) are completely separated, the second link (312) or the rotating member (313) abuts against the limiting member (330). During the rotation of the isolating switch (400) along the second rotation direction, the isolating switch (400) can drive the rotating member (313) to rotate, so that the rotating member (313) drives the first link (311) to rotate through the second link (312). Furthermore, the first link (311) pulls the moving contact (230) and the static contact (220) to gradually engage.

3. The vacuum parallel switch device according to claim 2, characterized in that, A guiding hole (3130) is provided on the rotating member (313). A first pin shaft (340) is provided at one end of the second link (312) connected to the rotating member (313). The first pin shaft (340) slidably passes through the guiding hole (3130). During the process from the initial contact between the isolating switch (400) and the rotating member (313) to the separation from the isolating contact (100) when the isolating switch (400) rotates along the first rotation direction, the first pin shaft (340) slides in the guiding hole (3130) without actuating the second link (312).

4. The vacuum parallel switch device according to claim 2, characterized in that, A conductive support arm (31311) and an insulating support arm (31321) are provided on the rotating member (313). The other end of the second link (312) is hinged to the conductive support arm (31311). The isolating switch (400) cooperates with the conductive support arm (31311) during the rotation along the first rotation direction, and the isolating switch (400) cooperates with the insulating support arm (31321) during the rotation along the second rotation direction.

5. The vacuum parallel switch device according to claim 4, characterized in that, The rotating member (313) is in a shape similar to a "匚", and the conductive support arm (31311) and the insulating support arm (31321) are arranged to be of unequal lengths.

6. The vacuum parallel switch device according to claim 4, characterized in that, The rotating member (313) includes a conductive support (3131) and an insulating support (3132); a connecting column (31312) is provided at one end of the conductive support (3131). A first connecting hole (31313) penetrating along the thickness direction is provided at the end of the conductive support (3131) where the connecting column (31312) is provided. The conductive support arm (31311) is provided at the other end of the conductive support (3131). One end of the insulating bracket (3132) is provided with a slot (31322) for insertion into the connecting post (31312). On the insulating bracket (3132), connecting ears (31323) are provided on opposite sides of the slot (31322). The connecting ears (31323) are provided with second connecting holes (31324). One end of the conductive bracket (3131) with the first connecting hole (31313) is sandwiched between the two connecting ears (31323), and the first connecting hole (31313) is correspondingly provided with the two second connecting holes (31324). The insulating shell (210) is provided with two spaced connecting plates (211), which are respectively connected to the two ends of the second pin (212). The second pin (212) passes through the first connecting hole (31313) and the two second connecting holes (31324). The rotating component (313) can rotate around the second pin (212).

7. The vacuum parallel switch device according to claim 6, characterized in that, The insulating support (3132) is also provided with two connecting arms (3133), which are respectively disposed on opposite sides of the insulating support (3132). Each connecting arm (3133) is provided with a first elastic element (320). One end of the first elastic element (320) is connected to the connecting arm (3133), and the other end is connected to the insulating shell (210).

8. The vacuum parallel switching device according to any one of claims 1-7, characterized in that, The transmission mechanism (300) further includes a second elastic element (350), one end of which is connected to the insulating housing (210) and the other end of which is connected to the transmission assembly (310). The second elastic element (350) is configured to always have the tendency to drive the transmission assembly (310) to engage the moving contact (230) with the stationary contact (220).

9. The vacuum parallel switching device according to any one of claims 1-7, characterized in that, The isolating switch (400) is connected to the isolating spindle (20), which is used to drive the isolating switch (400) to rotate. An insulating protective cover (500) is provided over the isolating spindle (20) and part of the isolating switch (400).

10. A switchgear, characterized in that, It includes a cabinet and a vacuum parallel switch device according to any one of claims 1-9, wherein the vacuum parallel switch device is disposed in the cabinet.

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