High-speed grounding switch

Abstract

The invention belongs to the technical field of metal-enclosed switchgear, and discloses a high-speed grounding switch. The high-speed grounding switch comprises a static contact assembly and a moving contact assembly. The static contact assembly comprises a containing oil cylinder and a static contact, insulating oil is arranged in the containing oil cylinder, and the static contact is arranged on one side of the containing oil cylinder and located in the containing oil cylinder. The moving contact assembly comprises a moving contact, the moving contact is arranged on the other side of the containing oil cylinder in a sliding and sealing mode, and the first end, used for being connected with the static contact in an inserted mode, of the moving contact is located in the containing oil cylinder. According to the high-speed grounding switch, the first end of the static contact and the first end of the moving contact can be completely immersed in the insulating oil of the closed accommodating oil cylinder, rapid cooling of electric arcs generated in the opening process is achieved, the rapid arc extinguishing effect based on the insulating oil is achieved, and the opening and closing induction current level and safety of the high-speed grounding switch are improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal-enclosed switch equipment, in particular to a fast grounding switch. Background Art

[0002] At present, in a fast earthing switch, an arc will be generated when the moving contact and the static contact are separated from each other to open the switch. However, since the moving contact and the static contact are in an insulating gas environment, the arc cannot be extinguished quickly, which easily reduces the opening and closing induced current level of the fast earthing switch, making it difficult to ensure the safety of the entire fast earthing switch.

[0003] Therefore, there is an urgent need for a fast grounding switch to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a fast earthing switch, which can realize rapid cooling of the arc generated during the opening process, so as to achieve a rapid arc extinguishing effect based on insulating oil, and improve the opening and closing induced current level and safety of the fast earthing switch.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] Fast earthing switch, including:

[0007] The static contact assembly comprises an oil accommodating cylinder and a static contact, wherein the oil accommodating cylinder is provided with insulating oil, and the static contact is arranged at one side of the oil accommodating cylinder and is located in the oil accommodating cylinder;

[0008] The moving contact assembly comprises a moving contact, which is slidably and sealedly arranged on the other side of the accommodating oil cylinder, and the first end of the moving contact used for plugging with the static contact is located in the accommodating oil cylinder.

[0009] As an optional solution, the moving contact is a rod-shaped structure, the first end of the moving contact is located in the arc extinguishing chamber in the accommodating oil cylinder, the second end of the moving contact is located outside the accommodating oil cylinder, the first end of the moving contact is provided with a plug-in blind hole, the static contact can be inserted in the plug-in blind hole, and the first end of the moving contact is also provided with a docking through hole, and the docking through hole is respectively connected to the arc extinguishing chamber and the plug-in blind hole.

[0010] As an optional solution, the moving contact assembly further includes:

[0011] An insulating cover is arranged at the first end of the moving contact. The insulating cover is in the shape of a hollow cylinder with both ends open and is connected to the plug-in blind hole. One end of the insulating cover serves as a connecting end connected to the first end of the moving contact, and the other end of the insulating cover serves as an open end for the static contact to pass through.

[0012] As an optional solution, the inner diameter of one end of the insulating cover close to the static contact is larger than the inner diameter of the other end and an arc-shaped transition is formed in the middle.

[0013] As an optional solution, the oil receiving cylinder includes:

[0014] Open cylinder;

[0015] A conductive support is connected to the opening side of the open cylinder body, and the open cylinder body and the conductive support are connected to form the arc extinguishing chamber.

[0016] As an optional solution, the stationary contact includes:

[0017] A static contact cylinder, located in the arc extinguishing chamber and connected to the conductive support;

[0018] The static arc contact is located in the static contact cylinder and connected to the conductive support. The moving contact can be moved into the static contact cylinder along the X-axis. The static arc contact is inserted into the plug-in blind hole, and the outer peripheral surface of the moving contact contacts the strap contact finger to conduct with the inner side wall of the static contact cylinder.

[0019] As an optional solution, a first sealing member is provided between the static contact cylinder and the conductive support;

[0020] And / or, a second seal is provided between the static arc contact and the conductive support;

[0021] And / or, a third sealing member is provided between the open cylinder body and the conductive support.

[0022] As an optional solution, a first metal insert is embedded in one end of the open cylinder body close to the conductive support, and the first metal insert is connected to the conductive support via a fastener.

[0023] As an optional solution, a second annular metal insert is embedded in the side of the open cylinder body opposite to the conductive support, one end of the moving contact passes through the second metal insert along the X-axis and is inserted into the arc extinguishing chamber, and a guide and a fourth seal are provided between the second metal insert and the moving contact.

[0024] As an optional solution, the moving contact assembly further includes:

[0025] A driving rod, an insulating connector, a flexible connector and a grounding insulator, wherein the insulating connector is connected to the second end of the moving contact, the driving rod is connected to the insulating connector, the driving rod is used to drive the moving contact to move along the X-axis, and the flexible connector is used to electrically connect the moving contact and the grounding insulator.

[0026] Beneficial effects:

[0027] The rapid earthing switch proposed in the present invention is provided with an oil cylinder containing insulating oil, and the first ends of the static contact and the moving contact are completely immersed in the insulating oil, so as to provide a closed insulating oil environment for the opening operation of the static contact and the moving contact; in the process of separating the static contact and the moving contact from each other to generate a high-temperature arc for opening, compared with placing the moving contact and the static contact in an insulating gas environment, the high-temperature energy of the arc can decompose the insulating oil to release hydrogen, thereby cooling and blowing the arc through hydrogen; and, the energy of the arc can be effectively absorbed through the excellent insulating performance and thermal conductivity of the insulating oil itself; that is, the above method can utilize the high-temperature energy of the arc to decompose the insulating oil and the insulating thermal conductivity characteristics of the insulating oil itself to achieve rapid cooling and blowing of the arc generated in the opening process, thereby improving the opening and closing induced current level of the rapid earthing switch, and ensuring the high safety of the entire rapid earthing switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The assembly cross-section view of the moving contact, the oil cylinder and the static contact provided in the present invention (excluding part of the moving contact structure and when the switch is not closed) Figure 1 ;

[0029] Figure 2 The assembly cross-section view of the moving contact, the oil cylinder and the static contact provided in the present invention (when the switch is closed) Figure 2 ;

[0030] Figure 3 The assembly cross-section view of the moving contact, the oil cylinder and the static contact provided in the present invention (when the switch is open) Figure 3 ;

[0031] Figure 4 It is a cross-sectional view of the fast earthing switch provided in the present invention.

[0032] In the figure:

[0033] 11. Oil-containing cylinder; 111. Arc-extinguishing chamber; 112. Open cylinder body; 1121. Oil filling port; 113. Conductive support; 114. Insulating oil; 115. Third sealing member; 116. First metal insert; 117. Fastener; 118. Second metal insert; 119. Fourth sealing member; 110. Guide member;

[0034] 121, static contact; 1211, static contact cylinder; 1212, static arc contact; 122, moving contact; 1221, plug-in blind hole; 1222, docking through hole; 123, insulation cover; 1231, connecting through hole; 124, first sealing member; 125, connecting bolt; 126, strap contact finger;

[0035] 20. Quick grounding switch;

[0036] 21. driving rod; 22. insulating connector; 23. flexible connector; 231. first connecting end; 232. second connecting end; 24. grounding insulator; 25. connecting plate; 26. bracket. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0041] like Figures 1 to 4 As shown, a fast grounding switch 20 is proposed in this embodiment, and the fast grounding switch 20 can achieve the purpose of fast arc extinguishing, thereby ensuring that the opening and closing induced current level and safety of the fast grounding switch 20 are high.

[0042] Specifically, Figures 1 to 4 As shown, the fast earthing switch 20 includes a static contact assembly and a moving contact assembly; wherein, the static contact assembly includes an accommodating cylinder 11 and a static contact 121, insulating oil 114 is arranged in the accommodating cylinder 11, and the static contact 121 is arranged on one side of the accommodating cylinder 11 and is located in the accommodating cylinder 11; the moving contact assembly includes a moving contact 122, and the moving contact 122 is slidably and sealedly arranged on the other side of the accommodating cylinder 11, and the first end of the moving contact 122 for plugging with the static contact 121 is located in the accommodating cylinder 11.

[0043] Compared with the prior art, the fast grounding switch 20 in this embodiment is additionally provided with an oil accommodating cylinder 11 provided with insulating oil 114; by making the first ends of the static contact 121 and the moving contact 122 completely immersed in the insulating oil 114, a closed insulating oil environment can be provided for the opening operation of the static contact 121 and the moving contact 122; in the process of separating the static contact 121 and the moving contact 122 from each other to open the high-temperature arc, compared with placing the moving contact 122 and the static contact 121 in an insulating gas environment, the high-temperature energy of the arc is reduced. The amount can decompose the insulating oil to release hydrogen, thereby cooling and blowing the arc through hydrogen; and the excellent insulation performance and thermal conductivity of the insulating oil itself can effectively absorb the energy of the arc; that is, the above method can use the high temperature energy of the arc to decompose the insulating oil and the insulating thermal conductivity of the insulating oil itself to achieve rapid cooling and blowing of the arc generated during the opening process, thereby improving the opening and closing induced current level of the fast grounding switch 20 and ensuring the safety of the entire fast grounding switch 20. Among them, an arc extinguishing cavity 111 is formed in the accommodating oil cylinder 11, and the insulating oil 114 is specifically arranged in the arc extinguishing cavity 111.

[0044] Furthermore, if Figures 1 to 3 As shown, the moving contact 122 is a rod-shaped structure, the first end of the moving contact 122 is located in the arc extinguishing chamber 111 in the accommodating cylinder 11, and the second end of the moving contact 122 is located outside the accommodating cylinder 11; a plug-in blind hole 1221 is provided at the first end of the moving contact 122, and the static contact 121 can be plugged into the plug-in blind hole 1221; and a docking through hole 1222 is also provided at the first end of the moving contact 122, and the docking through hole 1222 is respectively connected with the arc extinguishing chamber 111 and the plug-in blind hole 1221, so that the docking through hole 1222 can flow insulating oil 114 into the plug-in blind hole 1221.

[0045] Specifically, the moving contact 122 can move along the X-axis relative to the accommodating cylinder 11, so that part of the static contact 121 can be inserted into or removed from the plug-in blind hole 1221, and part of the static contact 121 can be in contact with or disconnected from the outer peripheral surface of the moving contact 122 to achieve closing and opening, and the docking through hole 1222 is used to flow insulating oil 114 into the plug-in blind hole 1221 when opening the switch.

[0046] By providing a docking through hole 1222 at the first end of the moving contact 122, and making the docking through hole 1222 communicate with the plug-in blind hole 1221 and the arc extinguishing chamber 111 respectively; Figure 3 As shown, in the process of the static contact 121 and the moving contact 122 separating from each other to generate an arc when the switch is opened, the static contact 121 gradually comes out of the plug-in blind hole 1221 to increase the available space of the plug-in blind hole 1221, so that the insulating oil 114 in the arc extinguishing chamber 111 can flow into the plug-in blind hole 1221 through the docking hole 1222, so that the insulating oil 114 cools the arc in the plug-in blind hole 1221, avoids the arc from gathering in the plug-in blind hole 1221, cools the arc in the plug-in blind hole 1221 more quickly, and further achieves the effect of rapid arc extinguishing. Among them, the specific flow direction of the insulating oil 114 in the arc extinguishing chamber 111 into the plug-in blind hole 1221 when the switch is opened is as follows: Figure 3 As shown by arrow B in FIG.

[0047] Specifically, in this embodiment, the insulating oil 114 is specifically mineral oil, so that the hydrogen released by the decomposition of the mineral oil under the action of the high-temperature arc can be the gas with the highest thermal conductivity and the lowest viscosity among all gases. Therefore, the cooling and blowing of the hydrogen can achieve rapid cooling and deionization of the arc to a large extent, ensuring a better effect of rapid arc extinguishing. Among them, mineral oil specifically refers to a liquid hydrocarbon mixture obtained by refining petroleum, and its main components include cycloalkanes and alkyl-substituted aromatic hydrocarbons.

[0048] Specifically, if Figure 2 As shown, when closing the circuit, the moving contact 122 is first moved along the X-axis in the direction close to the static contact 121, so that part of the static contact 121 is inserted into the plug-in blind hole 1221, and part of the static contact 121 is contacted and connected with the outer peripheral surface of the moving contact 122, so as to realize the closing of the moving contact 122 and the static contact 121; wherein, in the process of inserting the static contact 121 into the plug-in blind hole 1221, the available space of the plug-in blind hole 1221 is reduced, so that the insulating oil 114 in the plug-in blind hole 1221 can flow out into the arc extinguishing chamber 111 through the docking hole 1222 at this time, so that the insulating oil 114 in the plug-in blind hole 1221 will not interfere with the insertion of the static contact 121, thereby ensuring the smooth closing of the moving contact 122 and the static contact 121. wherein, the specific flow direction of the insulating oil 114 in the plug-in blind hole 1221 when closing the circuit is as shown in FIG. Figure 2 As shown by arrow A in FIG.

[0049] Furthermore, an insulating gas is provided on the periphery of the oil containment cylinder 11 to insulate the oil containment cylinder 11 from other surrounding conductive structures, thereby ensuring good insulation of the oil containment cylinder 11 and not affecting arc extinguishing in the oil containment cylinder 11, thereby ensuring stability and reliability of arc extinguishing in the oil containment cylinder 11. In this embodiment, the insulating gas may specifically be sulfur hexafluoride (SF6) gas having good insulating properties.

[0050] It is worth noting that when opening the gate, Figure 3 As shown, first the electrical connection between part of the static contact 121 and the outer peripheral surface of the moving contact 122 is disconnected, and then part of the static contact 121 completely disengages from the plug-in blind hole 1221. Therefore, the arc of the opening switch is mainly generated when the static contact 121 is completely disengaged from the plug-in blind hole 1221, that is, the arc involved in this embodiment is mainly concentrated in the plug-in blind hole 1221.

[0051] For this reason, Figures 1 to 3 As shown, the moving contact assembly further includes an insulating cover 123, which is arranged at the first end of the moving contact 122 located in the arc extinguishing chamber 111. The insulating cover 123 is in the shape of a hollow cylinder with both ends open, that is, a connecting through hole 1231 is arranged in the insulating cover 123, so that the connecting through hole 1231 is connected with the plug-in blind hole 1221, one end of the insulating cover 123 is connected to the first end of the moving contact 122 as a connecting end, and the other end of the insulating cover 123 is used as an open end for the static contact 121 to pass through, that is, the connecting through hole 1231 is used for the static contact 121 to pass through; that is, when the circuit breaker is closed, part of the static contact 121 can pass through the connecting through hole 1231 and then be smoothly inserted into the plug-in blind hole 1221. In this embodiment, the connecting end of the insulating cover 123 is threadedly connected to the first end of the moving contact 122 located in the arc extinguishing chamber 111.

[0052] By providing the insulating cover 123, the arc generated when the switch is opened can be prevented from running around in the arc extinguishing chamber 111, so that the arc can be suppressed by the insulating cover 123 in the connecting through hole 1231 and the plug-in blind hole 1221, which is beneficial for quickly cooling the arc in the connecting through hole 1231 and the plug-in blind hole 1221 through the insulating oil 114, so as to better achieve the purpose of rapid arc extinguishing.

[0053] Furthermore, if Figures 1 to 3As shown, the inner diameter of one end of the insulating cover 123 close to the static contact 121 is larger than the inner diameter of the other end and an arc-shaped transition is formed in the middle, so that the area of ​​the connecting through hole 1231 is larger, and the connecting through hole 1231 is expanded toward the static contact 121; on the one hand, it can better prevent the arc generated when the switch is opened from running around in the arc extinguishing chamber 111, so that a large amount of arc can be suppressed by the insulating cover 123 in the connecting through hole 1231 and the plug-in blind hole 1221, thereby better achieving the purpose of rapid arc extinguishing; on the other hand, the conical connecting through hole 1231 can provide a guiding effect for the plugging and disengagement between the static contact 121 and the plug-in blind hole 1221, ensuring that the static contact 121 can be smoothly and accurately inserted into or disengaged from the plug-in blind hole 1221, thereby ensuring the smoothness and accuracy of closing and opening the switch.

[0054] Specifically, Figures 1 to 3 As shown, the oil containing cylinder 11 includes an open cylinder body 112 and a conductive support 113; wherein, an oil filling port 1121 is provided on the open cylinder body 112, so as to inject insulating oil 114 into the arc extinguishing cavity 111 through the oil filling port 1121, and after the injection is completed, the oil filling port 1121 is closed to ensure the sealing of the entire open cylinder body 112; the conductive support 113 is connected to the open side of the open cylinder body 112, and the open cylinder body 112 and the conductive support 113 are connected to each other to form the above-mentioned arc extinguishing cavity 111. In this embodiment, in order to ensure a better arc extinguishing effect, the entire arc extinguishing cavity 111 is filled with insulating oil 114.

[0055] Specifically, the open cylinder body 112 is a barrel-shaped insulating structure, and the specific material of the open cylinder body 112 can be an aramid composite material with high strength, high temperature resistance and good oil resistance; the conductive support 113 is a plate-shaped conductive structure, so that the static contact 121 and the electrical components arranged outside the oil cylinder 11 can be electrically connected through the conductive support 113.

[0056] Furthermore, if Figures 1 to 3As shown, the static contact 121 includes a static contact cylinder 1211 and a static arc contact 1212; wherein, the static contact cylinder 1211 is located in the arc extinguishing chamber 111 and is connected to the conductive support 113; the static arc contact 1212 is located in the static contact cylinder 1211 and is connected to the conductive support 113, that is, there is no direct connection between the static arc contact 1212 and the static contact cylinder 1211; the moving contact 122 can be moved along the X-axis into the static contact cylinder 1211, the static arc contact 1212 is inserted into the plug-in blind hole 1221, and the outer peripheral surface of the moving contact 122 contacts the strap contact finger 126 to be conductive with the inner side wall of the static contact cylinder 1211, so as to realize the closing of the moving contact 122 and the static contact 121 in the arc extinguishing chamber 111. Among them, the static contact cylinder 1211, the static arc contact 1212 and the moving contact 122 are all made of copper, which has good arc erosion resistance; the static contact cylinder 1211 and the conductive support 113 are fastened by connecting bolts 125, and the static arc contact 1212 and the conductive support 113 are threadedly connected.

[0057] Specifically, Figures 1 to 3 As shown, a slot is provided along the circumferential direction on the inner side wall of the static contact cylinder 1211, and the above-mentioned watchband contact finger 126 is provided in the slot, and the watchband contact finger 126 can contact the outer peripheral surface of the moving contact 122, so that the moving contact 122 and the static contact cylinder 1211 can be electrically connected through the watchband contact finger 126, thereby ensuring the conduction between the entire static contact 121 and the moving contact 122. Among them, the watchband contact finger 126, as a conductive medium, is a specially formed elastic connecting element, which can significantly improve the quality of electrical connection and energy transmission.

[0058] Specifically, the conductive connection between the moving contact 122 and the stationary contact cylinder 1211 mainly relies on the strap contact finger 126, that is, as long as the outer peripheral surface of the moving contact 122 is separated from the strap contact finger 126, the electrical connection between the moving contact 122 and the stationary contact cylinder 1211 will be disconnected, which is not limited to the complete disconnection between the moving contact 122 and the stationary contact cylinder 1211.

[0059] It is worth noting that if Figure 3 As shown, due to the provision of the insulating cover 123, a large amount of arc can be suppressed by the insulating cover 123 in the connecting through hole 1231 and the plug-in blind hole 1221, so that during the opening process, the arc can be prevented from overflowing to the strap contact finger 126, thereby preventing the strap contact finger 126 from being burned, and better ensuring the conduction stability and reliability between the static contact 121 and the moving contact 122.

[0060] Furthermore, if Figure 1As shown, a first seal 124 is provided between the static contact cylinder 1211 and the conductive support 113, and / or a second seal (not shown in the figure) is provided between the static arc contact 1212 and the conductive support 113, and / or a third seal 115 is provided between the open cylinder 112 and the conductive support 113, so that the sealing effect between the entire static contact 121 and the conductive support 113 can be ensured by the first seal 124 and / or the second seal, and / or the sealing between the open cylinder 112 and the conductive support 113 can be ensured by the third seal 115, so that the insulating oil 114 can be better sealed in the arc extinguishing chamber 111, and there will be no problem of leakage of the insulating oil 114 through the gap between the static contact cylinder 1211 and the conductive support 113 and / or the gap between the static arc contact 1212 and the conductive support 113 and / or the gap between the open cylinder 112 and the conductive support 113.

[0061] In this embodiment, Figure 1 As shown, a first seal 124 is provided between the static contact cylinder 1211 and the conductive support 113, a second seal is provided between the static arc contact 1212 and the conductive support 113, and a third seal 115 is provided between the opening cylinder 112 and the conductive support 113, so as to better ensure the sealing of the mineral oil 114 in the arc extinguishing chamber 111. The first seal 124, the second seal and the third seal 115 can be specifically a sealing ring, and the sealing ring is made of oil-resistant and high-temperature resistant fluororubber material to achieve a better sealing effect.

[0062] Since the open cylinder body 112 is an insulating structure, that is, the open cylinder body 112 is usually made of non-metallic material; and the conductive support 113 is a conductive structure, that is, the conductive support 113 is usually made of metal; in the process of directly connecting the open cylinder body 112 and the conductive support 113, which have two materials with large differences, problems such as connection difficulties and poor connection stability are likely to occur.

[0063] In order to solve the above problems, in this embodiment, Figure 1 As shown, a first metal insert 116 is embedded in one end of the open cylinder 112 near the conductive support 113, and the first metal insert 116 is directly connected to the conductive support 113 through a fastener 117, so that the connection between the open cylinder 112 and the conductive support 113 can be achieved through the connection between the two metal materials, thereby making the connection simple and having good connection stability. Here, the specific structure of the first metal insert 116 is not limited, as long as the connection between the first metal insert 116 and the conductive support 113 can be achieved.

[0064] Specifically, the first metal insert 116 can be an aluminum part, which has a lower cost and better structural strength; and Figure 1As shown, the first metal insert 116 is threadedly connected to the conductive support 113 by a fastener 117. The number of the first metal insert 116 and the fastener 117 can be respectively set to multiple, so that the reliability connection between the open cylinder body 112 and the conductive support 113 can be achieved through multiple first metal inserts 116 and multiple fasteners 117, ensuring that the connection between the open cylinder body 112 and the conductive support 113 is more stable. In this embodiment, the fastener 117 can be a fastening bolt. Here, the specific number of the first metal insert 116 and the fastener 117 is not limited, as long as one fastener 117 corresponds to one first metal insert 116.

[0065] Furthermore, if Figure 1 As shown, a second annular metal insert 118 is embedded in the side of the open cylinder body 112 opposite to the conductive support 113, and one end of the moving contact 122 passes through the second metal insert 118 along the X-axis and is inserted into the arc extinguishing chamber 111, and a guide 110 and a fourth seal 119 are provided between the second metal insert 118 and the moving contact 122.

[0066] By providing the guide member 110, the movable contact 122 can slide along the X-axis in the guide member 110, so as to provide a relatively stable guiding effect for the sliding of the movable contact 122 along the X-axis, and ensure that the sliding position of the movable contact 122 will not be offset, so as to ensure that the movable contact 122 can make a linear motion along the X-axis. In this embodiment, the guide member 110 can be specifically a guide ring.

[0067] Furthermore, by providing the fourth sealing member 119, the sealing effect between the second metal insert 118 and the moving contact 122 can be ensured, thereby ensuring the sealing performance between the open cylinder 112 and the moving contact 122, further ensuring better sealing performance of the insulating oil 114 in the arc extinguishing chamber 111, and preventing the insulating oil 114 from leaking through the gap between the second metal insert 118 and the moving contact 122. In this embodiment, the fourth sealing member 119 can be specifically a sealing ring, and the sealing ring is made of oil-resistant and high-temperature resistant fluororubber material to achieve a better sealing effect.

[0068] Since the dimensions of the guide member 110 and the fourth seal 119 on the X-axis are relatively small, the dimensions of the annular grooves used to clamp the guide member 110 and the fourth seal 119 along the X-axis are also relatively small. If a smaller annular groove is directly opened in the open cylinder body 112, processing difficulties may easily occur, and the sealing performance of the open cylinder body 112 may be affected.

[0069] In order to solve the above problems, a first annular groove and a second annular groove are respectively arranged on the inner wall of the second metal insert 118 along the circumferential direction. The first annular groove and the second annular groove are spaced apart along the X-axis. The above-mentioned guide member 110 is clamped in the first annular groove, and the above-mentioned fourth seal 119 is clamped in the second annular groove, so that the guide member 110 and the fourth seal 119 can be connected to the open cylinder body 112 through the second metal insert 118.

[0070] By embedding the second metal insert 118 in the open cylinder body 112 and providing the first annular groove and the second annular groove on the second metal insert 118, the first annular groove and the second annular groove of smaller size can be processed more simply and conveniently in the second metal insert 118, thereby reducing the processing cost. Specifically, the second metal insert 118 can be an aluminum part with lower cost and better structural strength.

[0071] like Figure 4 As shown, the moving contact assembly also includes a driving rod 21, an insulating connector 22, a flexible connector 23 and a grounding insulator 24; wherein the insulating connector 22 is connected to the second end of the moving contact 122 located outside the accommodating cylinder 11, and the driving rod 21 is connected to the insulating connector 22, so that the driving rod 21 and the moving contact 122 can be ensured to have a reliable insulation effect through the insulating connector 22, and the driving rod 21 is used to drive the moving contact 122 to move along the X-axis; the grounding insulator 24 is fixedly arranged, and the flexible connector 23 is used to electrically connect the moving contact 122 and the grounding insulator 24, so that the moving contact 122 can be grounded through the grounding insulator 24. wherein the insulating connector 22 can specifically be an insulating plate. the working principle of the fast grounding switch 20 in this embodiment can refer to the working principle of the fast grounding switch 20 in the prior art, and no detailed description is given here.

[0072] like Figure 4 As shown, by providing a flexible connector 23 with a certain degree of flexible deformation ability, the first connection end 231 of the flexible connector 23 can move with the moving contact 122, ensuring that the flexible connector 23 does not interfere with the movement of the moving contact 122 along the X-axis; at the same time, the second connection end 232 of the flexible connector 23 can always maintain a safe connection with the fixed grounding insulator 24, thereby ensuring the grounding insulation requirements of the moving contact 122 and the grounding safety of the entire fast grounding switch 20. In this embodiment, the grounding insulator 24 can adopt a common grounding structure in the existing fast grounding switch 20.

[0073] Specifically, if Figure 4As shown, the flexible connector 23 is specifically a U-shaped flexible copper bar, the first connection end 231 of the U-shaped flexible copper bar is connected to one end of the moving contact 122, and the second connection end 232 of the U-shaped flexible copper bar is electrically connected to the grounding insulator 24 through the connecting plate 25, that is, the connecting plate 25 is connected to one end of the grounding insulator 24, and the second connection end 232 of the U-shaped flexible copper bar is connected to the connecting plate 25. Among them, the driving rod 21, the insulating connector 22, the moving contact 122 and the first connection end 231 of the U-shaped flexible copper bar are threadedly connected to each other through a connecting bolt.

[0074] Furthermore, if Figure 4 As shown, the fast earthing switch 20 further includes a bracket 26, the grounding insulator 24 is fixedly connected to the bracket 26, and the driving rod 21 is slidably disposed on the bracket 26 along the X-axis, so that the bracket 26 can provide installation support. Here, the specific structure of the bracket 26 is not limited, as long as it can provide installation support.

[0075] The specific working process of the fast grounding switch 20 in this embodiment is as follows:

[0076] First, the driving rod 21 drives the moving contact 122 to move, so that the moving contact 122 moves in the direction away from the static contact 121 along the X-axis, so that the outer peripheral surface of the moving contact 122 is completely disengaged from the inner wall of the static contact cylinder 1211. At this time, the static arc contact 1212 is still partially inserted in the plug-in blind hole 1221; then, the moving contact 122 continues to move in the direction away from the static contact 121 along the X-axis, so that the static arc contact 1212 is completely disengaged from the plug-in blind hole 1221, so that the moving contact 122 and the static contact 121 are completely disengaged, so as to realize the opening of the moving contact 122 and the static contact 121, and an arc will be generated between the static arc contact 1212 and the plug-in blind hole 1221 during the opening process.

[0077] Among them, in the process that the static arc contact 1212 gradually disengages from the plug-in blind hole 1221, the available space of the plug-in blind hole 1221 is gradually increased, so that the insulating oil 114 in the arc extinguishing chamber 111 flows into the plug-in blind hole 1221 through the docking through hole 1222, and since a large amount of arc can be suppressed in the connecting through hole 1231 and the plug-in blind hole 1221 by the insulating cover 123, the flowing insulating oil 114 can quickly cool down the arc in the plug-in blind hole 1221 and the connecting through hole 1231; at the same time, since the arc generated in the opening process has a high temperature, the insulating oil 114 is decomposed by the high temperature energy of the arc to release hydrogen, thereby cooling the arc through hydrogen and blowing the air; and, the excellent insulation performance and thermal conductivity of the insulating oil 114 itself can effectively absorb the energy of the arc, so as to better achieve the effect of rapid arc extinguishing.

[0078] The fast earthing switch 20 in this embodiment is provided with an oil cylinder 11 filled with insulating oil 114, and a connecting blind hole 1221 and a docking through hole 1222 are provided on the moving contact 122, and the connecting blind hole 1221 and the docking through hole 1222 are respectively connected to the arc extinguishing cavity 111 in the oil cylinder 11, so that the arc generated in the opening process can be quickly cooled and blown away by utilizing the structural setting of the moving contact 122 itself, the high temperature energy of the arc decomposing the insulating oil 114, and the insulating thermal conductivity characteristics of the insulating oil 114 itself, so as to avoid the arc gathering in the connecting blind hole 1221, so as to achieve the effect of fast arc extinguishing; and the moving contact 122 and the static contact 121 are immersed in the insulating oil 114, so that the insulating oil 114 can effectively absorb the energy of the arc, so as to better achieve the effect of fast arc extinguishing.

[0079] The fast earthing switch 20 in this embodiment is provided with an insulating cover 123 and a conical connecting through hole 1231 in the insulating cover 123, so that a large number of arc guiding covers can be arranged in the connecting through hole 1231 and the plug-in blind hole 1221, so that the insulating oil 114 can quickly cool the arc in the connecting through hole 1231 and the plug-in blind hole 1221, thereby better achieving the effect of rapid arc extinguishing.

[0080] The fast earthing switch 20 in this embodiment is configured with a first seal 124, a second seal, a fourth seal 119 and a third seal 115 that cooperate with each other, so as to achieve a sealing effect for the entire oil cylinder 11 and ensure that the insulating oil 114 has good sealing performance in the arc extinguishing chamber 111.

[0081] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Fast earthing switch, characterized in that: include: A stationary contact assembly comprises an oil accommodating cylinder (11) and a stationary contact (121), wherein insulating oil (114) is arranged in the oil accommodating cylinder (11), and the stationary contact (121) is arranged on one side of the oil accommodating cylinder (11) and is located in the oil accommodating cylinder (11); The moving contact assembly comprises a moving contact (122), wherein the moving contact (122) is slidably and sealedly arranged on the other side of the accommodating oil cylinder (11), and the first end of the moving contact (122) for plugging with the stationary contact (121) is located in the accommodating oil cylinder (11).

2. The fast earthing switch according to claim 1, characterized in that: The moving contact (122) is in a rod-shaped structure. The first end of the moving contact (122) is located in the arc extinguishing chamber (111) in the accommodating oil cylinder (11). The second end of the moving contact (122) is located outside the accommodating oil cylinder (11). The first end of the moving contact (122) is provided with a plug-in blind hole (1221). The static contact (121) can be plugged into the plug-in blind hole (1221). The first end of the moving contact (122) is also provided with a docking through hole (1222). The docking through hole (1222) is respectively connected to the arc extinguishing chamber (111) and the plug-in blind hole (1221).

3. The fast earthing switch according to claim 2, characterized in that: The moving contact assembly also includes: An insulating cover (123) is arranged at the first end of the moving contact (122); the insulating cover (123) is in the shape of a hollow cylinder with both ends open and is connected to the plug-in blind hole (1221); one end of the insulating cover (123) serves as a connecting end connected to the first end of the moving contact (122); and the other end of the insulating cover (123) serves as an open end for the stationary contact (121) to pass through.

4. The fast earthing switch according to claim 3, characterized in that: The inner diameter of one end of the insulating cover (123) close to the static contact (121) is larger than the inner diameter of the other end, and an arc-shaped transition is formed in the middle.

5. The fast earthing switch according to any one of claims 2 to 4, characterized in that: The oil receiving cylinder (11) comprises: An open cylinder (112); A conductive support (113), wherein the conductive support (113) is connected to the open side of the open cylinder (112), and the open cylinder (112) and the conductive support (113) are connected to form the arc extinguishing chamber (111).

6. The fast earthing switch according to claim 5, characterized in that: The stationary contact (121) comprises: A static contact cylinder (1211) is located in the arc extinguishing chamber (111) and is connected to the conductive support (113); The static arc contact (1212) is located in the static contact cylinder (1211) and is connected to the conductive support (113); the moving contact (122) can be moved along the X-axis into the static contact cylinder (1211); the static arc contact (1212) is inserted into the plug-in blind hole (1221), and the outer peripheral surface of the moving contact (122) contacts the strap contact finger (126) to conduct with the inner wall of the static contact cylinder (1211).

7. The fast earthing switch according to claim 6, characterized in that: A first sealing member (124) is provided between the static contact cylinder (1211) and the conductive support (113); And / or, a second seal is provided between the static arc contact (1212) and the conductive support (113); And / or, a third sealing member (115) is provided between the open cylinder body (112) and the conductive support (113).

8. The fast earthing switch according to claim 5, characterized in that: A first metal insert (116) is embedded in one end of the open cylinder body (112) close to the conductive support (113), and the first metal insert (116) is connected to the conductive support (113) via a fastener (117).

9. The fast earthing switch according to claim 5, characterized in that: A second metal insert (118) in the shape of an annulus is embedded in the side of the open cylinder body (112) opposite to the conductive support (113); one end of the moving contact (122) passes through the second metal insert (118) along the X-axis and is inserted into the arc extinguishing chamber (111); a guide member (110) and a fourth sealing member (119) are provided between the second metal insert (118) and the moving contact (122).

10. The fast earthing switch according to any one of claims 2 to 4, characterized in that: The moving contact assembly also includes: A driving rod (21), an insulating connector (22), a flexible connector (23) and a grounding insulator (24), wherein the insulating connector (22) is connected to the second end of the moving contact (122), the driving rod (21) is connected to the insulating connector (22), the driving rod (21) is used to drive the moving contact (122) to move along the X-axis, and the flexible connector (23) is used to electrically connect the moving contact (122) and the grounding insulator (24).

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