Isolation switch and switch equipment

Abstract

The invention belongs to the technical field of electrical equipment, and discloses an isolating switch and switch equipment, the isolating switch comprises a static contact seat, a static contact, a moving contact seat and a moving contact, and the moving contact can slide in the moving contact seat in a reciprocating manner so as to be matched with the static contact to realize opening and closing; a hollow air cavity is formed in the end portion of the moving contact, an air guide hole is formed in the end portion of the air cavity and communicated with the air cavity, and a heat conduction piece is further arranged in the air cavity and connected with the moving contact in a heat conduction mode. When the moving contact is separated from the static contact, an electric arc is generated, heat energy released by the electric arc is conducted into the air cavity through the moving contact and the heat conduction piece, insulating gas in the air cavity is heated and expanded, air pressure in the air cavity is increased, and the gas is jetted out along the gas guide hole under the action of high pressure and quickly blown to the root of the electric arc. And the arc extinguishing performance of the isolating switch is improved, so that the isolating switch obtains shorter arcing time, the contacts are prevented from being ablated by the arc, and the insulation performance of the isolating switch is prevented from being reduced too fast.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to an isolating switch and a switch device. Background Art

[0002] Gas-insulated metal-enclosed switchgear (GIS) includes circuit breakers, disconnectors, grounding switches, mutual inductors, lightning arresters, busbars, connectors and outgoing terminals, etc. These devices or components are all enclosed in a metal grounded casing, which is filled with SF6 insulating gas at a certain pressure, also known as SF6 fully enclosed combination electrical appliances. The disconnector includes a housing, a static contact and a moving contact arranged in the housing. The moving contact can move to separate from the static contact or to conduct electricity under the drive of the operating mechanism, so as to realize the opening and closing action of the disconnector and the conduction and disconnection of the current.

[0003] When the moving contact and the stationary contact are about to touch or just separated, an arc will be generated. Especially when the isolating switch is performing busbar switching and other high current cutting conditions, the arc between the moving contact and the stationary contact will seriously burn the stationary contact and / or the moving contact, and the generated decomposition products will also contaminate the insulating parts in the switch, causing switch insulation failure or reduced insulation performance, affecting the disconnecting performance of the isolating switch. In some existing isolating switches, although a baffle is set on the stationary contact, the baffle blocks and extinguishes the arc between the moving contact and the stationary contact when opening and closing, but the arc extinguishing speed and arc extinguishing effect are not good, which still causes ablation damage to the contact.

[0004] Therefore, there is an urgent need for an isolating switch and a switch device to solve the above problems existing in the prior art. Summary of the invention

[0005] The object of the present invention is to provide a disconnector and a switch device, which can quickly extinguish the arc generated between the static contact and the moving contact, improve the arc extinguishing ability, avoid the arc burning of the static contact and the moving contact, and ensure that the disconnector still has good insulation performance after multiple opening and closing.

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

[0007] On the one hand, a disconnector is provided, comprising a stationary contact seat and a stationary contact, a moving contact seat and a moving contact, wherein the moving contact can slide back and forth in the moving contact seat to cooperate with the stationary contact to realize opening and closing;

[0008] A hollow air cavity is formed at the end of the moving contact, an air guide hole is formed at the end of the air cavity, the air guide hole is communicated with the air cavity, a heat conducting member is further arranged in the air cavity, and the heat conducting member is thermally connected to the moving contact.

[0009] As an optional solution of the isolating switch provided by the present invention, the heat-conducting member includes a heat-conducting cylinder and a heat-conducting end plate provided at one end of the heat-conducting cylinder;

[0010] The heat-conducting end plate is directly or indirectly attached to the moving contact, and a through hole directly facing the air-conducting hole is provided on the heat-conducting end plate; the heat-conducting cylinder extends in a direction away from the air-conducting hole.

[0011] As an optional solution of the isolating switch provided in the present invention, a heat insulating sleeve is embedded in the moving contact, the heat insulating sleeve surrounds the air cavity, and the heat conducting member extends into the heat insulating sleeve.

[0012] As an optional solution of the isolating switch provided by the present invention, the moving contact comprises:

[0013] A conductive rod is slidably matched with the movable contact seat, an end of the conductive rod is provided with an embedding groove, the heat insulating sleeve is arranged in the embedding groove and is in sealing contact with the inner wall of the embedding groove;

[0014] The conductive contact portion is arranged at one end of the conductive rod and covers the notch of the embedding groove, and the air guide hole is arranged through the conductive contact portion.

[0015] As an optional solution of the isolating switch provided by the present invention, the insulation sleeve includes an insulation cylinder and an insulation end plate, the insulation cylinder is in sealing contact with the inner wall of the embedding groove, and the insulation end plate is connected to one end of the insulation cylinder away from the conductive contact part.

[0016] As an optional solution of the isolating switch provided by the present invention, the heat-conducting member includes a heat-conducting cylinder and a heat-conducting end plate provided at one end of the heat-conducting cylinder;

[0017] The heat-conducting cylinder and the heat-insulating cylinder are arranged at intervals; and / or the isolating switch further comprises a connecting piece, which passes through the heat-conducting end plate and is threadedly connected to the conductive contact portion so that the heat-conducting end plate is in close contact with the conductive contact portion.

[0018] As an optional solution of the isolating switch provided by the present invention, a sealing member is provided between the heat insulating sleeve and the inner wall of the embedding groove.

[0019] As an optional solution of the isolating switch provided in the present invention, the conductive rod is provided with a first mounting groove connected to the embedding groove, and the conductive contact portion is arranged in the first mounting groove and connected to the bottom wall of the first mounting groove through a fastener.

[0020] As an optional solution of the disconnector provided by the present invention, the air guide hole includes a first hole segment, a second hole segment and a third hole segment, and the air cavity is connected to the third hole segment through the first hole segment, the second hole segment and the third hole segment in sequence; the cross-sectional area of ​​the first hole segment and the cross-sectional area of ​​the third hole segment both gradually increase in a direction away from the second hole segment;

[0021] And / or, a contact protrusion is convexly provided on one end of the moving contact away from the air cavity, and the air guide hole is through-through arranged at the highest point of the contact protrusion.

[0022] On the other hand, a switch device is provided, comprising a circuit breaker, a linkage mechanism and the disconnector as described above, wherein the linkage mechanism connects the circuit breaker and the disconnector.

[0023] Beneficial effects of the present invention:

[0024] The present invention provides a disconnector and a switch device including the disconnector. When the disconnector is in use, a moving contact and a stationary contact are in an environment filled with insulating gas. By arranging an air cavity at the end of the moving contact and forming an air guide hole at the end of the air cavity, the insulating gas in the environment where the contacts are located can be introduced into the air cavity through the air guide hole. When the moving contact is separated from the stationary contact, an arc is generated, and the arc releases a large amount of heat energy. The heat of the arc is transferred to the heat-conducting member through the end of the moving contact. The heat-conducting member transfers the heat to the air cavity, so that the insulating gas in the air cavity expands due to the heat. The air pressure in the air cavity increases to form a high-pressure chamber. The gas is ejected along the air guide hole under the action of the high pressure in the air cavity, and quickly blows toward the root of the arc to extinguish the arc generated between the moving contact and the stationary contact, thereby improving the arc extinguishing performance of the disconnector, enabling the disconnector to obtain a shorter arc burning time, avoiding arc erosion of the contacts, and ensuring that the disconnector still has good insulation performance after multiple opening and closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0026] Figure 1 is a partial schematic diagram of a moving contact provided in a specific embodiment of the present invention;

[0027] Figure 2 It is a structural schematic diagram of an isolating switch provided in a specific embodiment of the present invention;

[0028] Figure 3 It is a structural schematic diagram of a moving contact assembly of an isolating switch provided in a specific embodiment of the present invention;

[0029] Figure 4 It is a structural schematic diagram of a static contact assembly of an isolating switch provided in a specific embodiment of the present invention;

[0030] Figure 5 It is a first view of the isolating switch from the open state to the closed state provided by the specific embodiment of the present invention;

[0031] Figure 6 is a second view of the isolating switch provided in a specific embodiment of the present invention from an open state to a closed state;

[0032] Figure 7 It is a third view of the isolating switch provided in the specific embodiment of the present invention from the open state to the closed state;

[0033] Figure 8 It is a first view of the isolating switch from the closed state to the open state provided by the specific embodiment of the present invention;

[0034] Fig. 9 is a second view of the isolating switch provided in a specific embodiment of the present invention from a closed state to an open state;

[0035] Fig.10 yes Fig. 9 A partial view of

[0036] Fig.11 It is a third view of the isolating switch provided in the specific embodiment of the present invention from the closed state to the open state.

[0037] In the figure:

[0038] 2. Conductive contact part; 3. Air cavity; 4. Heat conducting part; 5. Connecting part; 6. Fastener; 10. Electric arc;

[0039] 11. Conductive rod; 12. Thermal insulation sleeve; 13. Sealing element;

[0040] 111, embedded groove; 112, first installation groove; 113, second installation groove;

[0041] 21. air guide hole; 22. contact protrusion;

[0042] 211, first hole section; 212, second hole section; 213, third hole section;

[0043] 41. heat-conducting cylinder; 42. heat-conducting end plate; 421. through hole;

[0044] 121. heat-insulating cylinder; 122. heat-insulating end plate;

[0045] 100, housing assembly; 200, stationary contact assembly; 300, moving contact assembly; 400, grounding conductor;

[0046] 101, housing; 102, first pot-type insulator; 103, second pot-type insulator;

[0047] 201, static contact seat; 202, transmission rod; 203, static contact; 204, elastic member; 205, second guide sleeve; 206, guide rod; 207, guide ring; 208, second spring contact finger;

[0048] 2011, accommodating cavity; 2012, second guide hole;

[0049] 2021, stepped inner hole;

[0050] 301, moving contact; 302, moving contact seat; 303, transmission gear; 304, transmission rack; 305, first guide sleeve; 306, first spring contact finger; 307, supporting conductive member;

[0051] 3021, first guide hole;

[0052] 401. A third guide hole; 402. A third spring contact finger. DETAILED DESCRIPTION

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] In this embodiment, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0058] In the embodiments of the present invention, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0059] like Figure 2 As shown, it is a schematic diagram of the structure of the isolating switch provided in this embodiment, and the isolating switch includes a housing assembly 100, a static contact assembly 200 and a moving contact assembly 300. The static contact assembly 200 and the moving contact assembly 300 are both arranged in the housing assembly 100 and can be detachably contacted. The interior of the housing assembly 100 is a closed environment and is filled with insulating gas. The static contact assembly 200 and the moving contact assembly 300 are both in an environment filled with insulating gas.

[0060] The stationary contact assembly 200 includes a stationary contact seat 201 and a stationary contact 203, and the moving contact assembly 300 includes a moving contact seat 302 and a moving contact 301. The moving contact 301 can slide back and forth in the moving contact seat 302 to cooperate with the stationary contact 203 to realize opening and closing. The moving contact 301 of the disconnector has the ability to quickly extinguish the arc generated between the contacts, has excellent arc extinguishing performance, avoids arc erosion of the contacts, and ensures that the switch still has good insulation performance after multiple opening and closing.

[0061] Specifically, see Figure 1 and Figure 3 A hollow air cavity 3 is formed at the end of the moving contact 301 , an air guide hole 21 is formed at the end of the air cavity 3 , the air guide hole 21 is connected to the air cavity 3 , a heat conducting member 4 is also arranged in the air cavity 3 , and the heat conducting member 4 is thermally connected to the moving contact 301 .

[0062] Since the housing assembly 100 of the disconnector is filled with insulating gas, the moving contact 301 and the static contact 203 are in an environment filled with insulating gas when the disconnector is in use. The gas guide hole 21 is configured to introduce or guide the insulating gas into or out of the gas cavity 3. The insulating gas in the housing assembly 100 can be introduced into the gas cavity 3 through the gas guide hole 21, so that the gas cavity 3 is filled with insulating gas. The insulating gas is exemplified by SF6 (sulfur hexafluoride) insulating gas, which has extremely high insulation and arc extinguishing capabilities in a high voltage environment.

[0063] When the moving contact 301 and the stationary contact 203 separate, an arc 10 is generated (see Fig. 9 and Fig.10 ), the arc 10 releases a large amount of heat energy, and the heat of the arc 10 is conducted to the air cavity 3 through the moving contact 301, so that the insulating gas in the air cavity 3 expands due to the heat, and the air pressure in the air cavity 3 increases to form a high-pressure chamber. Under the action of the high pressure in the air cavity 3, the gas is ejected along the air guide hole 21 and blows quickly to the root of the arc 10 to extinguish the arc 10 generated between the moving contact 301 and the static contact 203, thereby improving the arc extinguishing performance of the disconnector, enabling the disconnector to obtain a shorter arcing time, avoiding the arc 10 from burning the contacts, and ensuring that the disconnector still has good insulation performance after multiple opening and closing.

[0064] It should be emphasized that when an arc 10 is generated between the moving contact 301 and the static contact 203, the heat of the arc 10 can be transferred to the air cavity 3, causing the gas in the air cavity 3 to expand and generate high pressure. At this time, the air pressure in the air cavity 3 is higher than the external air pressure, and the insulating gas in the air cavity 3 can only be ejected through the air guide hole 21 to achieve arc extinguishing by gas blowing.

[0065] In this embodiment, see Figure 2 The housing assembly 100 includes a housing 101, a first pot-type insulator 102, and a second pot-type insulator 103. The housing 101 is provided with a first mounting opening and a second mounting opening, the moving contact assembly 300 is mounted on the first pot-type insulator 102, the first pot-type insulator 102 is plugged and mounted at the first mounting opening, the static contact assembly 200 is mounted on the second pot-type insulator 103, and the second pot-type insulator 103 is plugged and mounted at the second mounting opening.

[0066] When assembling the disconnector, the moving contact assembly 300 and the first pot-type insulator 102 can be assembled first, and the static contact assembly 200 and the second pot-type insulator 103 can be assembled, and then the moving contact assembly 300 is extended into the housing 101 through the first installation opening, and the first pot-type insulator 102 is installed at the first installation opening, and the static contact assembly 200 is extended into the housing 101 through the second installation opening, and the second pot-type insulator 103 is installed at the second installation opening. The edge area of ​​the first pot-type insulator 102 and the first installation opening is connected by a flange structure, and the edge area of ​​the second pot-type insulator 103 and the second installation opening is connected by a flange structure.

[0067] Exemplarily, the axis of the first pot-type insulator 102 is perpendicular to the axis of the second pot-type insulator 103 .

[0068] In this embodiment, if Figure 2 and Figure 3 As shown, the moving contact 301 can move up and down in the moving contact seat 302 to approach or move away from the stationary contact assembly 200 to contact or separate from the stationary contact 203 .

[0069] Continue reading Figure 2 and Figure 3 The moving contact assembly 300 further includes a supporting conductive member 307 and a moving contact seat 302. The moving contact seat 302 is connected to the first pot-type insulator 102 of the housing assembly 100 through the supporting conductive member 307, and a first guide hole 3021 is provided on the moving contact seat 302. The moving contact 301 is slidably arranged in the first guide hole 3021 to move along the axial direction of the first guide hole 3021, and during the sliding process, the moving contact 301 is in conductive contact with the inner wall of the first guide hole 3021, so that the current can flow through the supporting conductive member 307, the moving contact seat 302 and the moving contact 301 in sequence.

[0070] A transmission gear 303 is rotatably provided on the supporting conductive member 307, and the transmission gear 303 is configured to be connected to the operating mechanism of the disconnector. A transmission rack 304 is fixedly provided on the moving contact 301, and the transmission rack 304 extends along the axial direction of the first guide hole 3021 and meshes with the transmission gear 303. The operator can drive the transmission gear 303 to rotate relative to the supporting conductive member 307 through the operating mechanism of the disconnector, so as to drive the transmission rack 304 to move linearly along its extension direction, and the transmission rack 304 drives the moving contact 301 to move along the axial direction of the first guide hole 3021, so as to make the moving contact 301 approach or move away from the static contact assembly 200, thereby completing the opening and closing of the disconnector.

[0071] Specifically, a first groove is provided on the supporting conductive member 307, a second groove directly opposite to the first groove is provided on the moving contact seat 302, and the second groove is communicated with the first guide hole 3021. A portion of the transmission gear 303 is located in the first groove, and the other portion passes through the second groove on the moving contact seat 302 and extends into the first guide hole 3021 to engage with the transmission rack 304.

[0072] Exemplarily, the supporting conductive member 307 is connected to the first pot-type insulator 102 via a fixing member such as a bolt or a screw, and the moving contact seat 302 is connected to the supporting conductive member 307 via a fixing member such as a bolt or a screw.

[0073] See also Figure 2 and Figure 3 The first guide hole 3021 is provided with a first guide sleeve 305, and the moving contact 301 is slidably inserted into the first guide sleeve 305. The material of the first guide sleeve 305 is non-metallic. The moving contact 301 is made of a conductive metal material, and the moving contact seat 302 is made of a conductive metal material. The moving contact 301 is in sliding contact with the inner wall of the first guide sleeve 305, so as to avoid the moving contact 301 directly sliding and rubbing with the inner wall of the first guide hole 3021 to generate metal powder, thereby preventing the metal powder from contaminating the insulating gas environment inside the housing assembly 100.

[0074] For example, see Figure 3 The first guide sleeve 305 is made of polytetrafluoroethylene, which can avoid the generation of metal powder when sliding and rubbing with the moving contact 301, and at the same time can reduce the friction force when the moving contact 301 slides in the first guide hole 3021, thereby improving the sliding smoothness of the moving contact 301.

[0075] Furthermore, a first contact finger groove is provided on the inner wall of the first guide hole 3021, and a first spring contact finger 306 is provided in the first contact finger groove, and the first spring contact finger 306 is in conductive contact with the moving contact 301. The first spring contact finger 306 can provide a certain elastic force to abut against the moving contact 301, so that the moving contact 301 always maintains good conductive contact with the moving contact seat 302 during the sliding process in the first guide hole 3021.

[0076] like Figure 2 and Figure 4 As shown, the stationary contact assembly 200 includes a stationary contact seat 201 , a transmission rod 202 , a stationary contact 203 and an elastic member 204 .

[0077] The static contact seat 201 is connected to the housing assembly 100. Specifically, the static contact seat 201 is connected to the second pot-type insulator 103 of the housing assembly 100 through a fixing member such as a bolt or a screw, and the static contact seat 201 is provided with a communicating accommodation cavity 2011 and a second guide hole 2012. The second guide hole 2012 is closer to the first guide hole 3021 than the accommodation cavity 2011, and is arranged opposite to the first guide hole 3021, that is, the axis of the first guide hole 3021 coincides or approximately coincides with the axis of the second guide hole 2012. The transmission rod 202 movably passes through the second guide hole 2012 and is connected to the static contact 203. The elastic member 204 is located between the transmission rod 202 and the inner wall of the accommodation cavity 2011. When the transmission gear 303 is driven to rotate by the operating mechanism, the transmission gear 303 drives the moving contact 301 to move axially along the first guide hole 3021 through the transmission rack 304, and the moving contact 301 can penetrate into the second guide hole 2012, so that the moving contact 301 pushes the static contact 203, and the static contact 203 then compresses the elastic member 204 through the transmission rod 202 until the moving contact 301 moves to the closing position. The compressed elastic member 204 is used to provide elastic contact pressure between the moving contact 301 and the static contact 203, so that the moving and static contacts (i.e., the moving contact 301 and the static contact 203) maintain good contact when the disconnector is closed, thereby reducing the contact resistance.

[0078] See also Figure 4 The static contact assembly 200 further includes a second guide sleeve 205 and a guide rod 206. The second guide sleeve 205 is connected to the second pot-type insulator 103 by means of fixing parts such as bolts or screws. The guide rod 206 is located inside the second guide sleeve 205 and is spaced apart from the inner wall of the second guide sleeve 205. One end of the second guide rod 206 is provided with an external thread structure and is screwed onto the second pot-type insulator 103. The transmission rod 202 is hollow inside and can be slidably inserted into the second guide sleeve 205. The guide rod 206 and the inner cavity of the transmission rod 202 are slidably matched, so that the transmission rod 202 has high movement accuracy. Furthermore, the inner cavity of the transmission rod 202 is a stepped inner hole 2021, and a threaded column is provided on the static contact 203, and the threaded column is screwed on the small diameter section of the stepped inner hole 2021. A part of the elastic member 204 is located in the large diameter section of the stepped inner hole 2021 and abuts against the stepped surface of the stepped inner hole 2021, and the other part is sleeved on the guide rod 206 and abuts against the stop shoulder arranged around the outer wall of the guide rod 206.

[0079] Exemplarily, the elastic member 204 is a spring.

[0080] See also Figure 4, a guide ring 207 is installed on the inner wall of the second guide sleeve 205 and / or the outer wall of the transmission rod 202, and the transmission rod 202 is slidably matched with the second guide sleeve 205 through the guide ring 207. Since the transmission rod 202 and the second guide sleeve 205 are both made of conductive metal materials, if the two are in direct frictional contact, metal powder will be generated, destroying the insulation environment inside the housing assembly 100. The material of the guide ring 207 is a non-metallic material, and the frictional contact between the transmission rod 202 and the guide ring 207 and / or the frictional contact between the second guide sleeve 205 and the guide ring 207 can avoid the generation of metal powder. Exemplarily, the material of the guide ring 207 is polytetrafluoroethylene, which can not only avoid the generation of metal powder by friction, but also reduce friction and improve the sliding smoothness of the transmission rod 202 in the second guide sleeve 205.

[0081] Continue reading Figure 4 A second contact finger groove is provided in the second guide hole 2012, and a second spring contact finger 208 is provided in the second contact finger groove. The second spring contact finger 208 is used for conductive contact with the moving contact 301 inserted into the second guide hole 2012, so that a certain contact pressure is maintained between the moving contact 301 and the static contact seat 201 to ensure stable and good conduction.

[0082] Combination Figure 2 The housing assembly 100 of the isolating switch is also provided with a grounding conductor 400. The grounding conductor 400 and the stationary contact assembly 200 are respectively provided on both sides of the moving contact assembly 300. The grounding conductor 400 is provided with a third guide hole 401, and the third guide hole 401 is arranged opposite to the first guide hole 3021. The moving contact 301 can be driven to move toward the grounding conductor 400 through the transmission gear 303. When the moving contact 301 is inserted into the third guide hole 401 and is in conductive contact with the inner wall of the third guide hole 401, the main circuit of the isolating switch is disconnected, and the moving contact seat 302 is connected to the housing 101 and grounded.

[0083] Furthermore, a third contact finger groove is provided in the grounding conductor 400 , and a third spring contact finger 402 is provided in the third contact finger groove. The third spring contact finger 402 is used to provide a certain elastic pressure to make conductive contact with the moving contact 301 , thereby ensuring good conductive contact between the moving contact 301 and the grounding conductor 400 .

[0084] See also Figure 3 At least one first contact finger groove is provided on the inner wall of the first guide hole 3021 on both sides of the first guide sleeve 305, and a first spring contact finger 306 is provided in each first contact finger groove, ensuring that the moving contact 301 can maintain good contact with the moving contact seat 302 when moving toward the direction approaching the static contact assembly 200 and when moving toward the direction approaching the grounding conductor 400, thereby reducing the contact resistance.

[0085] For example, see Figure 2The axis of the second pot-type insulator 103 is in the same direction as the axis of the static contact assembly 200, the axis of the first pot-type insulator 102 is perpendicular to the axis of the moving contact assembly 300, and the axis of the first pot-type insulator 102 is perpendicular to the axis of the second pot-type insulator 103, so that the static contact assembly 200 and the grounding conductor 400 can be respectively arranged on both sides of the moving contact assembly 300, and the structural arrangement is reasonable and compact.

[0086] In this embodiment, the stationary contact seat 201 is roughly spherical, and the end of the moving contact seat 302 close to the stationary contact assembly 200 and the end close to the grounding conductor 400 are both roughly spherical, and the spherical body has good electric field distribution performance. Figure 1 As shown, a heat-insulating sleeve 12 is embedded in the moving contact 301, and the heat-insulating sleeve 12 surrounds the air cavity 3, and the heat-conducting member 4 extends into the heat-insulating sleeve 12. Further, the moving contact provided in this embodiment includes a conductive rod 11 and a conductive contact portion 2. The conductive rod 11 is slidably inserted into the first guide hole 3021 of the moving contact seat 302, and is in sliding contact with the inner wall of the first guide sleeve 305. During the sliding process, the conductive rod 11 elastically abuts against the first spring contact finger 306. An embedding groove 111 is provided on the conductive rod 11, and the heat-insulating sleeve 12 is provided in the embedding groove 111 and is in sealing contact with the inner wall of the embedding groove 111. The conductive contact portion 2 is conductively connected to one end of the conductive rod 11 and covers the notch of the embedding groove 111 to limit the heat-insulating sleeve 12 inside the embedding groove 111 to prevent the heat-insulating sleeve 12 from moving. The aforementioned air cavity 3 is formed between the conductive contact portion 2 and the inner wall of the heat-insulating sleeve 12. The air conducting hole 21 is provided through the conductive contact part 2. The heat conducting member 4 is connected to the conductive contact part 2 by heat conduction, and the heat conducting member 4 extends to the inner cavity of the heat insulating sleeve 12. The heat conducting member 4 is used to conduct the heat of the arc 10 on the conductive contact part 2 to the inside of the heat insulating sleeve 12, that is, to the air cavity 3, so that the insulating gas in the air cavity 3 is quickly heated and expanded.

[0087] The heat-insulating sleeve 12 is in sealed contact with the inner wall of the embedding groove 111, which can ensure good airtightness of the entire air cavity 3. The heat-insulating sleeve 12 can prevent the heat of the arc 10 from being transferred to the conductive rod 11, prevent the conductive rod 11 from overheating, and protect the movable contact 301. On the other hand, the heat-insulating sleeve 12 blocks the heat of the arc 10 inside the air cavity 3, reduces heat loss, and makes the insulating gas in the air cavity 3 expand rapidly due to heat, so that the air pressure in the air cavity 3 increases rapidly, which is convenient for the insulating gas to be quickly ejected through the air guide hole 21, so as to speed up the air blowing arc extinguishing speed, reduce the arc burning time, and improve the arc extinguishing performance of the disconnector.

[0088] In this embodiment, the heat insulating sleeve 12 is made of insulating and heat insulating materials, such as glass fiber, silicone rubber, polyethylene, etc., but not limited thereto.

[0089] See also Figure 1The conductive rod 11 is provided with a first mounting groove 112 connected to the embedding groove 111, and a stepped groove structure is formed between the first mounting groove 112 and the embedding groove 111, and the cross-sectional area of ​​the first mounting groove 112 is larger than the cross-sectional area of ​​the embedding groove 111. The conductive contact part 2 is arranged in the first mounting groove 112 and connected to the bottom wall of the first mounting groove 112 through the fastener 6. The provision of the first mounting groove 112 not only increases the installation stability of the conductive contact part 2 on the conductive rod 11, but also increases the difficulty of insulating gas leaking through the gap between the conductive contact part 2 and the conductive rod 11, thereby improving the air tightness of the air cavity 3.

[0090] Exemplarily, the fastener 6 is a screw, which ensures a stable connection between the conductive contact portion 2 and the conductive rod 11 and maintains good conductive contact, and is also convenient for installation and removal.

[0091] See also Figure 1 and Figure 3 The conductive rod 11 is provided with a second mounting groove 113 along its length direction, and the transmission rack 304 is installed in the second mounting groove 113 by screws, and does not protrude from the outer wall of the conductive rod 11, so as to prevent the transmission rack 304 from interfering with the first spring contact finger 306. The gear teeth of the transmission gear 303 extend into the second mounting groove 113 to mesh with the transmission rack 304 for transmission.

[0092] In this embodiment, see Figure 1 The heat-insulating sleeve 12 includes a heat-insulating cylinder 121 and a heat-insulating end plate 122. The heat-insulating cylinder 121 is in sealing contact with the inner wall of the embedding groove 111. The heat-insulating end plate 122 is connected to one end of the heat-insulating cylinder 121 away from the conductive contact portion 2, so that an air cavity 3 is formed between the inner wall of the heat-insulating cylinder 121, the inner wall of the heat-insulating end plate 122 and the conductive contact portion 2. The guide rod 206 is also provided with an inner hole, which is connected to one end of the embedding groove 111 away from the first installation groove 112, and forms a stepped structure with the embedding groove 111, and the cross-sectional area of ​​the embedding groove 111 is larger than the cross-sectional area of ​​the inner hole. The heat-insulating end plate 122 abuts against the stepped surface of the stepped structure, which is convenient for positioning the heat-insulating sleeve 12. In addition, the heat insulating sleeve 12 has a simple structure and is easy to manufacture and shape, and the embedding groove 111 can be adaptively set to a structure consistent with the shape and size of the heat insulating cylinder 121, so as to facilitate the sealing contact between the heat insulating sleeve 12 and the embedding groove 111.

[0093] In other embodiments, the shape and structure of the heat insulating sleeve 12 and the shape of the embedding groove 111 can be designed according to requirements, as long as the sealing contact between the heat insulating sleeve 12 and the embedding groove 111 is ensured.

[0094] Furthermore, a seal 13 is provided between the insulation sleeve 12 and the inner wall of the embedding groove 111 to seal the gap between the insulation sleeve 12 and the conductive rod 11 to prevent high-temperature and high-pressure insulating gas from leaking through the gap therebetween, thereby improving the air tightness of the air cavity 3 .

[0095] Specifically, the outer wall of the heat insulating sleeve 12 is provided with a first sealing groove, in which a sealing member 13 is embedded; and / or the inner wall of the embedding groove 111 is provided with a second sealing groove, in which a sealing member 13 is embedded.

[0096] Exemplarily, the sealing member 13 is a sealing rubber ring.

[0097] In the present embodiment, the heat conductive member 4 is inside the heat insulating cylinder 121 and extends toward the heat insulating end plate 122. Exemplarily, the extension length of the heat conductive member 4 is not less than one half of the length of the heat insulating cylinder 121, and further, is not less than three quarters of the length of the heat insulating cylinder 121, thereby ensuring that heat can be conducted to the entire air cavity 3 as much as possible, thereby improving the uniformity of heating and expansion of the gas in the air cavity 3.

[0098] Alternatively, see Figure 1 , a connector 5 is also provided on the moving contact 301. The heat-conducting member 4 includes a heat-conducting cylinder 41 and a heat-conducting end plate 42 provided at one end of the heat-conducting cylinder 41, and the heat-conducting cylinder 41 is open at one end away from the heat-conducting end plate 42. The heat-conducting end plate 42 is directly or indirectly attached to the conductive contact part 2, and is connected to the conductive contact part 2 through the connector 5. A through hole 421 is provided on the heat-conducting end plate 42, which is directly opposite to the air guide hole 21, and the through hole 421 is used to achieve the connection between the air cavity 3 and the air guide hole 21. There is a large contact heat conduction area between the heat-conducting end plate 42 and the conductive contact part 2, which can promptly and quickly conduct the heat on the conductive contact part 2 to the heat-conducting member 4. The heat-conducting cylinder 41 is located in the heat-insulating cylinder 121 of the heat-insulating sleeve 12, and extends in the direction close to the heat-insulating end plate 122, so as to quickly conduct the heat on the heat-conducting end plate 42 to the entire air cavity 3.

[0099] Specifically, the connector 5 passes through the heat-conducting end plate 42 and is threadedly connected to the conductive contact portion 2, so that the heat-conducting end plate 42 is in close contact with the conductive contact portion 2, thereby absorbing the heat generated by the arc on the conductive contact portion 2 and conducting it to the inside of the air cavity 3 through the heat-conducting cylinder 41, so as to heat the gas in the air cavity 3. The above-mentioned connector 5 can be a screw, which is convenient to connect and is stable and reliable. At the same time, the screw can also conduct part of the heat to the heat-conducting member 4 and the inside of the air cavity 3, thereby improving the heat conduction effect.

[0100] The heat-conducting end plate 42 can be directly attached to the surface of the conductive contact part 2 to ensure good heat conduction between the two. Alternatively, a heat-conducting layer can be sandwiched between the heat-conducting end plate 42 and the conductive contact part 2 so that the two are in indirect contact through the heat-conducting layer. The heat-conducting layer is, for example, heat-conducting silica gel, which ensures that there is no gap between the heat-conducting end plate 42 and the conductive contact part 2, thereby improving the heat conduction effect.

[0101] Furthermore, the cross-sections of the heat-conducting cylinder 41 and the heat-insulating cylinder 121 are both circular, so that the inner and outer wall surfaces of the heat-conducting cylinder 41 and the inner wall surface of the heat-insulating cylinder 121 are relatively smooth, thereby reducing the resistance of the insulating gas when flowing.

[0102] In other embodiments, the shape and structure of the heat conductor 4 may include a corrugated plate, etc., which can increase the contact area with the insulating gas in the air cavity 3 and transfer more heat. Of course, the heat conductor 4 may also have other shape and structure, which is not specifically limited.

[0103] Exemplarily, the heat conducting member 4 is made of a metal material having a high thermal conductivity, such as steel material, copper material, etc., but is not limited thereto.

[0104] In this embodiment, see Figure 1 The heat-conducting member 4 is spaced from the inner wall of the heat-insulating sleeve 12, specifically, the heat-conducting cylinder 41 and the heat-insulating cylinder 121 are spaced to avoid direct contact between the heat-conducting member 4 and the heat-insulating sleeve 12, which may cause partial heat loss on the heat-insulating sleeve 12, so that the entire surface of the heat-conducting member 4 is used to contact the insulating gas as much as possible, and the insulating gas is quickly heated to expand. Moreover, there is a gap between the heat-conducting cylinder 41 and the heat-insulating cylinder 121. Since the gap is small, the insulating gas in it can quickly increase the pressure of the gap space after being heated, thereby forcing the insulating gas in the gap space to flow into the heat-conducting cylinder 41, and then smoothly ejected through the through hole 421 and the gas-conducting hole 21, and quickly blow out the arc 10.

[0105] Optionally, the heat conducting member 4 and the heat insulating sleeve 12 are coaxially arranged to improve the uniformity of heating the insulating gas in the air cavity 3 by the heat conducting member 4 .

[0106] See also Figure 1, the air guide hole 21 includes a first hole section 211, a second hole section 212 and a third hole section 213 which are connected in sequence, and the air cavity 3 is connected to the third hole section 213 through the first hole section 211, the second hole section 212 in sequence. The cross-sectional area of ​​the first hole section 211 and the cross-sectional area of ​​the third hole section 213 both gradually increase in the direction away from the second hole section 212, that is, the first hole section 211 and the third hole section 213 are both in the shape of trumpet holes. The opening of the first hole section 211 at one end away from the second hole section 212 is larger to introduce more insulating gas. The inner diameter of the second hole section 212 is the minimum inner diameter of the first hole section 211 and the third hole section 213. The insulating gas is accelerated at the second hole section 212 by shrinking, the blowing speed of the insulating gas is increased, the insulating gas forms a more powerful airflow, and the arc extinguishing ability of the gas blowing is improved. The opening of the third hole section 213 at one end away from the second hole section 212 is larger to expand the diffusion range of the insulating gas to extinguish the arc 10 in a larger area.

[0107] Furthermore, a contact protrusion 22 is convexly provided at one end of the conductive contact portion 2 away from the air cavity 3, and an air guide hole 21 is provided through the highest point of the contact protrusion 22. The arc 10 is easily gathered at the tip position, and the arc 10 generated between the conductive contact portion 2 and the static contact 203 is distributed in the area where the contact protrusion 22 is located. The air guide hole 21 is provided at the highest point of the contact protrusion 22, so that the blown high-voltage insulating gas can blow out the arc just at the concentrated position of the arc 10, thereby achieving precise arc extinguishing, reducing the arc burning time, and accelerating the extinguishing of the arc 10.

[0108] More specifically, the surface of the contact protrusion 22 and the inner wall of the third hole section 213 form an arc transition, so as to avoid turbulence and deceleration of the insulating gas at this position when the insulating gas is ejected.

[0109] The following reference Figure 2 , Figures 5 to 11 The opening and closing process of the isolating switch provided in this embodiment is described.

[0110] (1) Closing operation stage

[0111] like Figure 2 As shown, in the open state, the moving contact 301 of the moving contact assembly 300 is in the first guide hole 3021 and is kept separated from the static contact 203 of the static contact assembly 200. The operator drives the transmission gear 303 along the operating mechanism of the isolating switch. Figure 5 The transmission rack 304, driven by the transmission gear 303, moves the conductive rod 11 and the conductive contact part 2 along the first guide hole 3021, extends out of the first guide hole 3021 and approaches the static contact assembly 200. Figure 5As shown, when the conductive contact part 2 is about to contact the stationary contact 203, an arc 10 is generated between the conductive contact part 2 and the stationary contact 203, reaching a pre-breakdown state, but the pre-breakdown time is very short at this time, and the contact ablation is very small. Figure 6 As shown, the conductive contact portion 2 is in contact with the fixed contact 203, and the arc 10 disappears.

[0112] Transmission gear 303 continues along Figure 6 The conductive rod 11 is driven to continue to move by the transmission rack 304, and the conductive rod 11 extends into the second guide hole 2012 of the static contact seat 201, and maintains conductive contact with the static contact seat 201 through the second spring contact finger 208. The conductive contact part 2 pushes the static contact 203 under the drive of the conductive rod 11, and the static contact 203 compresses the elastic member 204 through the transmission rod 202. When the disconnector reaches the closing position, the static contact 203 is pushed to the limit position in the static contact seat 201 by the conductive contact part 2, and the elastic member 204 is compressed to the maximum elastic force value under the working state, which makes the conductive contact part 2 and the static contact 203 fully contact each other to prevent the conductive contact part 2 and the static contact 203 from arcing again. In addition, the conductive rod 11 is fully in contact with the static contact seat 201 through the second spring contact finger 208, so that the current is turned on.

[0113] (2) Opening operation stage

[0114] When the isolating switch is Figure 7 When the closing state shown in the figure is switched to the opening state, the transmission gear 303 is driven along the Figure 8 The transmission rack 304 rotates clockwise in the direction indicated by the middle arrow, and the transmission gear 303 drives the conductive rod 11 and the static contact 203 to move away from the static contact assembly 200. When the conductive contact portion 2 has not yet escaped from the second guide hole 2012 of the static contact seat 201, the static contact 203 always maintains full contact with the conductive contact portion 2 under the elastic force of the elastic member 204, and the arc 10 is avoided in this stage.

[0115] When the conductive rod 11 and the conductive contact part 2 move to Figure 8 In the state shown, the conductive contact part 2 is about to separate from the stationary contact 203. The transmission gear 303 continues to rotate, so that the conductive contact part 2 continues to move away from the stationary contact 203. Fig. 9 and Fig.10As shown, at the moment when the conductive contact part 2 is separated from the static contact 203, an arc 10 is generated. The energy (mainly heat energy) of the arc 10 is transferred along the conductive contact part 2 to the heat-conducting part 4. The heat-conducting part 4 is heated and transfers the heat energy to the insulating gas (such as SF6 insulating gas) in the air cavity 3 defined by the thermal insulation sleeve 12 and the conductive contact part 2. The insulating gas expands due to the heat, so that the air cavity 3 forms a high-pressure chamber. At the same time, the thermal insulation sleeve 12 plays a role in isolating heat to prevent heat from being lost along the conductive rod 11, and the seal 13 between the thermal insulation sleeve 12 and the conductive rod 11 prevents the high-voltage insulating gas from leaking from the gap between the two, so that the insulating gas can only be quickly ejected from the gas guide hole 21 of the conductive contact part 2 and blown to the root of the arc 10 to achieve arc extinguishing. The flow direction of the insulating gas is as shown in Fig. 9 and Fig.10 As indicated by the arrow at the middle air cavity 3.

[0116] Transmission gear 303 continues along Fig.11 The conductive rod 11 is rotated clockwise in the direction shown to drive the conductive rod 11 back to the opening position, and the disconnector is now switched to the opening state. Because the arc 10 between the conductive contact part 2 and the static contact 203 is blown out by the high-voltage insulating gas before the conductive rod 11 reaches the opening position, the current transmission is cut off, so that the disconnector obtains a shorter arcing time, the arc extinguishing performance is improved, and the ablation of the contact is reduced.

[0117] The present embodiment also provides a switchgear, comprising a circuit breaker, a linkage mechanism and an isolating switch as described above, wherein the linkage mechanism connects the circuit breaker and the isolating switch. For example, the linkage mechanism is used to lock the isolating switch after the circuit breaker is closed. The switchgear may also include a grounding switch, wherein the linkage mechanism connects the circuit breaker, the isolating switch and the grounding switch, and is used to lock the isolating switch and the grounding switch after the circuit breaker is closed. Exemplarily, the switchgear is a GIS (gas-insulated metal-enclosed switchgear). The composition structure and connection of the GIS (such as the linkage between the linkage mechanism and the circuit breaker, the grounding switch and the isolating switch) are existing mature technologies and will not be described in detail here.

[0118] The beneficial effects of the switch device having the isolating switch provided by this embodiment are as described above.

[0119] It can be understood that the isolating switch provided in this embodiment can also be used alone to achieve opening and closing, and can also be used in the above-mentioned switch device and used in conjunction with a circuit breaker and a grounding switch.

[0120] 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. An isolating switch, comprising a stationary contact seat (201) and a stationary contact (203), a moving contact seat (302) and a moving contact (301), wherein the moving contact (301) can slide back and forth in the moving contact seat (302) to cooperate with the stationary contact (203) to realize opening and closing, characterized in that: A hollow air cavity (3) is formed at the end of the moving contact (301), an air guide hole (21) is formed at the end of the air cavity (3), the air guide hole (21) is connected to the air cavity (3), a heat conducting member (4) is also arranged in the air cavity (3), and the heat conducting member (4) is thermally connected to the moving contact (301).

2. The isolating switch according to claim 1, characterized in that: The heat-conducting member (4) comprises a heat-conducting cylinder (41) and a heat-conducting end plate (42) arranged at one end of the heat-conducting cylinder (41); The heat-conducting end plate (42) is directly or indirectly attached to the moving contact (301), and a through hole (421) directly opposite to the air guide hole (21) is provided on the heat-conducting end plate (42); the heat-conducting cylinder (41) extends in a direction away from the air guide hole (21).

3. The isolating switch according to claim 1 or 2, characterized in that: The moving contact (301) is embedded with a heat insulating sleeve (12), the heat insulating sleeve (12) surrounds the air cavity (3), and the heat conducting member (4) extends into the heat insulating sleeve (12).

4. The isolating switch according to claim 3, characterized in that: The moving contact (301) comprises: A conductive rod (11) is slidably matched with the movable contact seat (302), an end of the conductive rod (11) is provided with an embedding groove (111), and the heat insulating sleeve (12) is arranged in the embedding groove (111) and is in sealing contact with the inner wall of the embedding groove (111); The conductive contact portion (2) is arranged at one end of the conductive rod (11) and covers the notch of the embedding groove (111); and the air guide hole (21) is arranged through the conductive contact portion (2).

5. The isolating switch according to claim 4, characterized in that: The heat-insulating sleeve (12) comprises a heat-insulating cylinder (121) and a heat-insulating end plate (122); the heat-insulating cylinder (121) is in sealing contact with the inner wall of the embedding groove (111); and the heat-insulating end plate (122) is connected to an end of the heat-insulating cylinder (121) away from the conductive contact portion (2).

6. The isolating switch according to claim 5, characterized in that: The heat-conducting member (4) comprises a heat-conducting cylinder (41) and a heat-conducting end plate (42) arranged at one end of the heat-conducting cylinder (41); The heat-conducting cylinder (41) and the heat-insulating cylinder (121) are arranged at an interval; and / or the isolating switch further comprises a connecting piece (5), wherein the connecting piece (5) passes through the heat-conducting end plate (42) and is threadedly connected to the conductive contact portion (2) so that the heat-conducting end plate (42) is in close contact with the conductive contact portion (2).

7. The isolating switch according to claim 4, characterized in that: A sealing member (13) is provided between the heat insulating sleeve (12) and the inner wall of the embedding groove (111).

8. The isolating switch according to claim 4, characterized in that: The conductive rod (11) is provided with a first mounting groove (112) connected to the embedding groove (111); the conductive contact portion (2) is arranged in the first mounting groove (112) and connected to the bottom wall of the first mounting groove (112) via a fastener (6).

9. The isolating switch according to claim 1 or 2, characterized in that: The air guide hole (21) comprises a first hole segment (211), a second hole segment (212) and a third hole segment (213); the air cavity (3) is connected to the third hole segment (213) through the first hole segment (211), the second hole segment (212) and the third hole segment (213) in sequence; the cross-sectional area of ​​the first hole segment (211) and the cross-sectional area of ​​the third hole segment (213) both gradually increase in a direction away from the second hole segment (212); And / or, a contact protrusion (22) is protruding from one end of the moving contact (301) away from the air cavity (3), and the air guide hole (21) is arranged through the highest point of the contact protrusion (22).

10. A switchgear, characterized in that It comprises a circuit breaker, a linkage mechanism and an isolating switch according to any one of claims 1 to 9, wherein the linkage mechanism connects the circuit breaker and the isolating switch.

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