High-speed grounding switch and high-voltage switchgear

Abstract

The invention provides a high-speed grounding switch and a high-voltage switchgear, and the high-speed grounding switch comprises a housing which is provided with an accommodation cavity; the supporting structure is installed on the shell, the supporting structure is provided with a movable cavity, and the movable cavity communicates with the containing cavity; the movable assembly comprises a movable contact, a pull rod and a piston, one end of the movable contact is connected with one end of the pull rod, the movable contact is arranged in the movable cavity, the piston is connected with the pull rod and movably connected with the movable cavity, an air chamber is defined by the piston and the movable cavity, the movable contact is provided with a flow channel, the pull rod is provided with an air channel, and the air channel is communicated with the flow channel and the air chamber; the static end support is arranged in the accommodating cavity, and the static end support is used for being matched with the moving contact; the driving mechanism is used for driving the pull rod to move. The embodiment of the invention can effectively reduce the transmission risk at the joint of the connecting rod and the piston, can simplify the structure, can effectively eliminate the influence of the gap at the joint of the connecting rod and the moving contact on the airflow field, and facilitates the improvement of the smoothness of the airflow field.

Description

Technical Field

[0001] The present application relates to the technical field of high-voltage switchgear, and in particular to a fast grounding switch and a high-voltage switchgear. Background Art

[0002] With the rapid development of the national power industry and the large-scale promotion of ultra-high and extra-high voltage power transmission, higher and higher requirements are placed on the breaking capacity of fast grounding switches. The fast grounding switches currently used in equipment have the disadvantages of complex structure and inability to effectively extinguish arcs.

[0003] As an important component of high-voltage switchgear, the fast grounding switch can not only open and close the capacitive current generated by electrostatic induction and the inductive current generated by electromagnetic induction, but also quickly ground the main circuit when an arc is burning inside the casing, and use the circuit breaker to cut off the fault current to ensure the safe and stable operation of the equipment. This requires the fast grounding switch to have a faster cutting ability and a strong arc extinguishing ability.

[0004] In the related art, the fast earthing switch is mainly composed of a connecting rod, a baffle, a guide sleeve, a piston cylinder, a moving contact, an insulating plate, a static contact seat, a piston plate, a spring, a mechanism connecting plate, etc. The connecting rod is connected to the moving contact, the piston plate is fixed between the moving contact and the connecting rod and is arranged in the piston cylinder, the baffle and the spring are installed on the piston plate, and the mechanism connecting plate drives the connecting rod and the moving contact to realize the opening and closing operation through the mechanism driving mechanism. During the opening movement, the piston plate compresses the gas to realize the compressed gas to extinguish the arc. However, the pressure relief device, baffle and spring are arranged on the piston, and its structure is complicated. During the closing process, it will cause the air pressure in the cylinder to be unbalanced, affecting the speed of opening and closing. At the same time, the structure of the pull rod and the piston is relatively complicated, and there is a problem of the strength of the connecting surface structure in the transmission. In addition, the existing fast earthing switch cannot effectively blow out the arc. There is a gap at the connection between the piston, the connecting rod and the moving contact, which affects the smoothness of the air flow field, and the traditional structure flow channel does not change the gas flow channel, and the final air blowing speed is slow, affecting the blowing efficiency. Summary of the invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a fast grounding switch and a high-voltage switchgear, which can effectively reduce the transmission risk at the connection between the pull rod and the piston, and can also eliminate the influence of the gap at the connection between the pull rod and the moving contact on the airflow field.

[0006] In one aspect, an embodiment of the present application discloses a fast grounding switch, comprising:

[0007] A housing having a receiving cavity;

[0008] A supporting structure, mounted on the housing, wherein the supporting structure has an active cavity, and the active cavity is communicated with the accommodating cavity;

[0009] A movable assembly, comprising a movable contact, a pull rod and a piston, wherein one end of the movable contact is connected to one end of the pull rod, and the movable contact is arranged in the movable cavity, the piston is connected to the pull rod, and the piston is movably connected to the movable cavity, wherein the piston and the movable cavity enclose an air chamber, the movable contact has a flow channel, the pull rod is provided with an air channel, and the air channel connects the flow channel and the air chamber;

[0010] A static end support, disposed in the accommodating cavity, the static end support being used to cooperate with the moving contact; and

[0011] The driving mechanism is used to drive the pull rod to move.

[0012] In some embodiments of the present application, the support structure includes a cylinder barrel and a support portion, the support portion is fixedly connected to the outer periphery of the cylinder barrel, the shell is provided with a mounting hole, the cylinder barrel is inserted into the mounting hole, and the support portion is connected to the shell.

[0013] In some embodiments of the present application, one end of the cylinder barrel close to the static end support is open, and one end of the cylinder barrel close to the static end support is at least partially disposed in the accommodating cavity.

[0014] In some embodiments of the present application, the support portion and the cylinder barrel are an integral structure.

[0015] In some embodiments of the present application, the flow channel includes a first part and a second part, the second part is connected to the air channel, and the first part is connected to the accommodating cavity and the second part, wherein the cross-sectional area of ​​the second part is larger than the cross-sectional area of ​​the first part.

[0016] In some embodiments of the present application, the driving mechanism includes a crank box, a connecting rod and a crank arm, the crank box is installed on the supporting structure, the crank box has a accommodating cavity, the pull rod, the connecting rod and the crank arm are arranged in the accommodating cavity, and the crank arm drives the pull rod to move through the connecting rod.

[0017] In some embodiments of the present application, the crank arm box is provided with a notch, and the driving mechanism further includes a cover plate, and the cover plate is sealingly connected to the notch.

[0018] In some embodiments of the present application, a connection hole is provided at one end of the pull rod close to the moving contact, and the moving contact is threadedly connected to the connection hole.

[0019] In some embodiments of the present application, the flow channel is arranged through the upper end surface and the lower end surface of the moving contact.

[0020] Another aspect of the present application discloses a high-voltage switch device, including the fast grounding switch as described above.

[0021] It can be seen from the above technical solutions that the embodiments of the present application have at least the following beneficial effects:

[0022] The fast grounding switch provided in the embodiment of the present application has a piston and a pull rod as an integrated structure, which can not only effectively reduce the transmission risk at the connection between the connecting rod and the piston, but also simplify the structure, and can effectively eliminate the influence of the gap at the connection between the connecting rod and the moving contact on the airflow field, which is conducive to improving the smoothness of the airflow field. At the same time, the opening or closing action can be achieved by driving the moving contact and the piston to move through the pull rod, wherein the piston directly slides with the accommodating cavity of the support structure to form a piston structure, so that the overall structure of the fast grounding switch can be simplified, which is conducive to reducing transmission losses and also helps to improve reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A partial structural schematic diagram of a fast grounding switch provided in one embodiment of the present application;

[0025] Figure 2 for Figure 1 A schematic diagram of the partially enlarged structure of part A;

[0026] Figure 3 A schematic diagram of the structure of a movable component in a fast earthing switch provided in one embodiment of the present application.

[0027] Reference numerals:

[0028] 100, housing; 110, accommodating chamber;

[0029] 200, support structure; 210, cylinder barrel; 211, active chamber; 220, support part;

[0030] 310, moving contact; 311, flow channel; 3111, first part; 3112, second part; 320, pull rod; 321, air channel; 322, air hole; 330, piston;

[0031] 400, static end support;

[0032] 510, crank box; 511, accommodating cavity; 512, notch; 520, connecting rod; 530, crank; 540, rotating shaft; 550, cover plate;

[0033] 600. Air chamber. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] See also Figure 1 and Figure 2 As shown, an embodiment of the present application discloses a fast grounding switch, including a housing 100, a support structure 200, a movable component, a static end support 400 and a driving mechanism.

[0036] Specifically, the housing 100 has a housing chamber 110; the support structure 200 is mounted on the housing 100, and the support structure 200 has an active chamber 211, and the active chamber 211 is connected to the housing chamber 110; the movable assembly includes a moving contact 310, a pull rod 320 and a piston 330, one end of the moving contact 310 is connected to one end of the pull rod 320, and the moving contact 310 is arranged in the active chamber 211, the piston 330 is connected to the pull rod 320, and the piston 330 is movably connected to the active chamber 211. Among them, the piston 330 and the active chamber 211 enclose an air chamber 600, the moving contact 310 has a flow channel 311, and the pull rod 320 is provided with an air channel 321, and the air channel 321 connects the flow channel 311 and the air chamber 600. The static end support 400 is arranged in the housing chamber 110, and the static end support 400 is used to cooperate with the moving contact 310. The driving mechanism is used to drive the pull rod 320 to move.

[0037] When closing the circuit breaker, the driving mechanism drives the pull rod 320 to move along the X direction, so that the pull rod 320 drives the moving contact 310 to move along the X direction and gradually approach the static end support 400 until the closing action is completed. During the closing process, the gas in the accommodating chamber 110 can flow through the flow channel 311 and the air channel 321 to the air chamber 600 enclosed by the piston 330 and the active chamber 211.

[0038] When opening the circuit breaker, the driving mechanism drives the pull rod 320 to move in the opposite direction of the X direction, so that the moving contact 310 is separated from the static end support 400 and the opening action is completed. During the opening process, the piston 330 moves synchronously with the pull rod 320 in the opposite direction of the X direction, so that the piston 330 compresses the gas in the gas chamber 600, so that the gas in the gas chamber 600 flows out from the gas channel 321 and the flow channel 311 in turn. Among them, the static end support 400 is located on the extended side of the flow channel 311 along the X direction, so the gas flowing out of the flow channel 311 can be blown to the static end support 400 to extinguish the arc.

[0039] In the fast grounding switch provided in the embodiment of the present application, the piston 330 and the pull rod 320 are an integrated structure, which can not only effectively reduce the transmission risk at the connection between the connecting rod and the piston 330, but also simplify the structure, and can effectively eliminate the influence of the gap at the connection between the connecting rod and the moving contact 310 on the airflow field, which is conducive to improving the smoothness of the airflow field. At the same time, the opening or closing action can be realized by driving the moving contact 310 and the piston 330 to move through the pull rod 320, wherein the piston 330 directly slides with the accommodating cavity 110 of the support structure 200 to form the piston 330 structure, so that the overall structure of the fast grounding switch can be simplified, which is conducive to reducing transmission losses and also helps to improve reliability.

[0040] See also Figure 1 and Figure 2 As shown, in some embodiments of the present application, the support structure 200 includes a cylinder barrel 210 and a support portion 220, the support portion 220 is fixedly connected to the outer periphery of the cylinder barrel 210, the housing 100 is provided with a mounting hole, the cylinder barrel 210 is inserted into the mounting hole, and the support portion 220 is connected to the housing 100. The cylinder barrel 210 is provided with an avoidance hole for the pull rod 320 to pass through, and the pull rod 320 is slidably connected to the avoidance hole.

[0041] Further, see Figure 1 and Figure 2 As shown, one end of the cylinder barrel 210 close to the static end support 400 is an opening, and the end of the cylinder barrel 210 close to the static end support 400 is at least partially disposed in the accommodating cavity 110. The size of the aforementioned opening may be the same as that of the piston 330, so that the moving contact 310 may pass through the opening to cooperate with the static end support 400, and the piston 330 may also be directly installed in the active cavity 211 of the cylinder barrel 210.

[0042] It is worth understanding that when the size of the opening is larger than the outer contour size of the moving contact 310, the movable cavity 211 of the piston 330 close to the static end support 400 can always be connected to the accommodating cavity 110, that is, the structure composed of the piston 330 and the cylinder barrel 210 is a single air chamber structure. Compared with the double air chamber structure, the embodiment of the present application adopts a single air chamber structure, which has a simpler structure, has low requirements on the mechanism operation work, and can also improve the reliability of the product.

[0043] Of course, in some other embodiments, the size of the opening may also be set to match the outer circumference of the moving contact 310 , so that the moving contact 310 can pass through the opening and cooperate with the static end support 400 .

[0044] In one embodiment of the present application, the cylinder barrel 210 and the support portion 220 are an integral structure.

[0045] See also Figure 1 and Figure 3 As shown, in some embodiments of the present application, the flow channel 311 includes a first portion 3111 and a second portion 3112, the second portion 3112 is in communication with the gas channel 321, the first portion 3111 is in communication with the accommodating chamber 110 and the second portion 3112, wherein the cross-sectional area of ​​the second portion 3112 is greater than the cross-sectional area of ​​the first portion 3111. In this way, in the process of gas flowing from the second portion 3112 to the first portion 3111, due to the Venturi effect, the gas flow rate can be increased when the gas passes through the narrow space of the first portion 3111, so that the flow rate of the gas blown out from the moving contact 310 is increased, which is conducive to improving the effect of blowing to extinguish the arc.

[0046] In one possible implementation, see Figures 1 to 3 The air channel 321 extends along the X direction, and the pull rod 320 is further provided with an air hole 322 , which connects the air chamber 600 and the air channel 321 .

[0047] See also Figure 1 and Figure 2 In some embodiments of the present application, the driving mechanism includes a crank box 510, a connecting rod 520 and a crank arm 530. The crank box 510 is installed on the supporting structure 200. The crank box 510 has a receiving cavity 511. The pull rod 320, the connecting rod 520 and the crank arm 530 are arranged in the receiving cavity 511. The crank arm 530 drives the pull rod 320 to move through the connecting rod 520. The two ends of the connecting rod 520 are rotatably connected to the pull rod 320 and the crank arm 530 respectively. Figure 1 In the illustrated structure, a rotation axis 540 is shown between the pull rod 320 and the connecting rod 520 , and the connecting rod 520 is rotatably connected to the pull rod 320 around the rotation axis 540 .

[0048] In a possible implementation, the driving mechanism further includes a driving member, which is used to drive the crank arm 530 to rotate, and the crank arm 530 drives the pull rod 320 to move along the X direction or in the opposite direction of the X direction through the connecting rod 520.

[0049] See also Figure 1 In some embodiments of the present application, the crank box 510 is provided with a notch 512 , and the driving mechanism further includes a cover plate 550 , and the cover plate 550 is sealed and connected to the notch 512 .

[0050] See also Figures 1 to 3 In some embodiments of the present application, a connection hole is provided at one end of the pull rod 320 close to the moving contact 310, and the moving contact 310 is threadedly connected to the connection hole, so that the moving contact 310 is fixedly connected to the pull rod 320. In this embodiment, the moving contact 310 is threadedly connected to the pull rod 320, that is, the moving contact 310 and the pull rod 320 can be assembled later.

[0051] Of course, in some other embodiments, the moving contact 310 may also be connected to the pull rod 320 by welding or fixed connection.

[0052] In the conventional solution of using double air chambers 600 and opening air holes on the cylinder wall, the movement and operation requirements of the piston 330 are increased, and the reliability of the product is low. Figure 1 and Figure 3 In some embodiments of the present application, the flow channel 311 is set through the upper end surface and the lower end surface of the moving contact 310. Among them, the structure of this embodiment adopts a single air chamber structure, and a pair of perforations are opened on the moving contact 310. The simple structure can reduce the operating work and increase the reliability of the product.

[0053] On the other hand, an embodiment of the present application discloses a high-voltage switch device, including a fast grounding switch as described above, which has all the technical effects of the aforementioned fast grounding switch and will not be repeated here.

[0054] The following describes the fast grounding switch and high-voltage switchgear of the embodiment of the present application in detail with a specific embodiment. It should be noted that the following embodiment is only an exemplary description and should not be understood as a limitation on the embodiment of the present application.

[0055] See also Figures 1 to 3 As shown, a support structure 200 is installed on the housing 100, and the support structure 200 is connected to the crank box 510, and the notch 512 at the left end of the crank box 510 is sealed by a cover plate 550. Among them, the pull rod 320 and the piston 330 are integrated, the moving contact 310 is threadedly connected to the pull rod 320, and the upper end of the pull rod 320 is connected through the connecting rod 520 and the crank 530 to transmit the opening and closing actions; the static end support 400 is separated and matched with the moving contact 310 during the opening and closing process. The support structure 200 includes a cylinder barrel 210 and a support part 220, and the cylinder barrel 210 and the support part 220 are integrated into a cylinder support flange. The pull rod 320 can drive the moving contact 310 to move in the active cavity 211 of the cylinder barrel 210 to complete the opening or closing movement. In this embodiment, the overall structure of the fast grounding switch is simpler, thereby reducing transmission loss and having higher reliability.

[0056] During the closing process, the moving contact 310 moves downward, and the gas is sucked from the accommodating chamber 110 of the housing 100 through the flow channel 311 into the air chamber 600 formed by the piston 330 and the active chamber 211. During the opening process, the moving contact 310 moves upward, and the piston 330 compresses the gas in the formed air chamber 600, so that the gas is blown out from the air channel 321 through the flow channel 311 of the moving contact 310 to extinguish the arc.

[0057] In this embodiment, the pull rod 320 and the piston 330 are integrated, which can effectively remove the gap between them, increase the smoothness of the air flow field inside the moving contact 310, and reduce gas energy loss; at the same time, it can reduce the complexity of assembly, simplify the assembly process, and improve assembly and production efficiency; the flow channel 311 adopts a variable diameter treatment, and the inner diameter of the flow channel 311 close to the static end support 400 is reduced, which can increase the gas flow rate, thereby increasing the blowing efficiency. The cylinder barrel 210 and the support part 220 are integrated into a cylinder support flange, which has a more compact structure and makes the transmission more reliable.

[0058] Compared with the conventional solution that uses a double air chamber 600, opens air holes on the cylinder wall, increases the operating work requirements for the piston 330, and reduces the reliability of the product, this embodiment uses a single air chamber structure, which is simpler in structure, has low requirements for the operating work of the mechanism, and can improve the reliability of the product.

[0059] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0060] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0061] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0062] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0063] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

Claims

1. A fast grounding switch, characterized in that: include: A housing having a receiving cavity; A supporting structure, mounted on the housing, wherein the supporting structure has an active cavity, and the active cavity is communicated with the accommodating cavity; A movable assembly, comprising a movable contact, a pull rod and a piston, wherein one end of the movable contact is connected to one end of the pull rod, and the movable contact is arranged in the movable cavity, the piston is connected to the pull rod, and the piston is movably connected to the movable cavity, wherein the piston and the pull rod are an integral structure, the piston and the movable cavity enclose an air chamber, the movable contact has a flow channel, the pull rod is provided with an air channel, and the air channel connects the flow channel and the air chamber; A static end support, disposed in the accommodating cavity, the static end support being used to cooperate with the moving contact; and The driving mechanism is used to drive the pull rod to move.

2. The fast earthing switch according to claim 1, characterized in that: The supporting structure includes a cylinder barrel and a supporting portion, wherein the supporting portion is fixedly connected to the outer periphery of the cylinder barrel, the shell is provided with a mounting hole, the cylinder barrel is inserted into the mounting hole, and the supporting portion is connected to the shell.

3. The fast earthing switch according to claim 2, characterized in that: One end of the cylinder barrel close to the static end support is open, and one end of the cylinder barrel close to the static end support is at least partially arranged in the accommodating cavity.

4. The fast grounding switch according to claim 1, characterized in that: The support portion and the cylinder barrel are an integrated structure.

5. The fast earthing switch according to any one of claims 1 to 4, characterized in that: The flow channel includes a first portion and a second portion, the second portion is in communication with the air channel, the first portion is in communication with the accommodating cavity and the second portion, wherein a cross-sectional area of ​​the second portion is greater than a cross-sectional area of ​​the first portion.

6. The fast grounding switch according to claim 1, characterized in that: The driving mechanism includes a crank box, a connecting rod and a crank arm. The crank box is installed on the supporting structure. The crank box has a accommodating cavity. The pull rod, the connecting rod and the crank arm are arranged in the accommodating cavity. The crank arm drives the pull rod to move through the connecting rod.

7. The fast earthing switch according to claim 6, characterized in that: The crank box is provided with a notch, and the driving mechanism further comprises a cover plate, and the cover plate is sealed and connected to the notch.

8. The fast earthing switch according to claim 1, characterized in that: A connecting hole is provided at one end of the pull rod close to the moving contact, and the moving contact is threadedly connected to the connecting hole.

9. The fast grounding switch according to claim 1, characterized in that: The flow channel is arranged through the upper end surface and the lower end surface of the moving contact.

10. A high voltage switchgear, characterized in that: It comprises the fast earthing switch according to any one of claims 1 to 9.

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