Sulfur hexafluoride nitrogen fusion medium isolation device and electrical equipment

Abstract

The invention provides a sulfur hexafluoride nitrogen fusion medium isolation device and electrical equipment. The sulfur hexafluoride nitrogen fusion medium isolation device comprises a moving contact assembly and a static contact assembly, the static contact assembly comprises a static contact seat and a static contact, a connecting cavity facing an opening of the moving contact assembly is formed in the static contact seat, and the static contact is connected with the cavity bottom of the connecting cavity and extends in the direction of the moving contact assembly. The end, close to the moving contact assembly, of the static contact protrudes out of the static contact base, the moving contact assembly is provided with a separation station and a connection station relative to the static contact assembly, when the moving contact assembly is located at the separation station, the moving contact assembly is separated from the static contact, and when the moving contact assembly is located at the connection station, the moving contact assembly is separated from the static contact. And at least part of the structure of the moving contact assembly extends into the connecting cavity and is contacted and conducted with the static contact. Therefore, the sulfur hexafluoride-nitrogen fusion medium can be applied to electrical equipment adopting a fusion medium of sulfur hexafluoride and nitrogen, the proportion of sulfur hexafluoride is less, and the sulfur hexafluoride-nitrogen fusion medium is lower-carbon and more environment-friendly on the premise of ensuring the electrical life.

Description

Technical Field

[0001] The present invention relates to the technical field of partition devices, and particularly to a sulfur hexafluoride-nitrogen fusion medium partition device and an electrical equipment. Background Art

[0002] In modern power systems, there are many bus conversion operations. As a key device in bus conversion operations, the partition device will largely affect the safety of the power system.

[0003] At present, the partition device generally uses the insertion of dynamic contacts and static contacts to realize the opening and closing of the bus conversion current. To ensure the safety of the opening and closing process, 99.9% pure sulfur hexafluoride gas is usually used as the insulating and arc extinguishing medium.

[0004] To make the power system more low-carbon and environmentally friendly, the proportion of sulfur hexafluoride in the medium will be reduced as much as possible. However, the reduction of the proportion of sulfur hexafluoride will lead to many problems such as the decline of the insulation performance of the partition device, the decline of the opening and closing performance of the bus conversion current, and the serious ablation of the contacts. Summary of the Invention

[0005] In order to at least partially solve the problems existing in the prior art, according to one aspect of the present invention, a sulfur hexafluoride-nitrogen fusion medium partition device is provided. The sulfur hexafluoride-nitrogen fusion medium partition device includes a moving contact assembly and a static contact assembly. The static contact assembly includes a static contact seat and a static contact. A connection cavity opening towards the moving contact assembly is formed in the static contact seat. The static contact is connected to the bottom of the connection cavity and extends towards the moving contact assembly. The static contact is slidably connected to the static contact seat. When the static contact is in the extended position relative to the static contact seat, the end of the static contact close to the moving contact assembly protrudes from the static contact seat. The moving contact assembly has a partition position and a communication position relative to the static contact assembly. When the moving contact assembly is in the partition position, the moving contact assembly and the static contact are separated from each other. When the moving contact assembly is in the communication position, at least part of the structure of the moving contact assembly extends into the connection cavity and contacts and conducts with the static contact.

[0006] Exemplarily, a conduction part is formed at the end of the static contact close to the moving contact assembly, and at least part of the structure of the conduction part is made of nickel-based alloy material.

[0007] Exemplarily, the end of the conduction part facing the moving contact assembly is arc-shaped.

[0008] Exemplarily, the static contact further includes a connection part connected between the conduction part and the bottom of the connection cavity. The connection part is made of copper material. When the moving contact assembly is in the communication position, the moving contact assembly contacts and conducts with the conduction part, and the moving contact assembly contacts and conducts with the connection part.

[0009] Exemplarily, on the outer peripheral surface of the static contact, along the radial direction of the static contact, the length of the conduction part accounts for 3% - 40% of the length of the static contact.

[0010] Exemplarily, the connecting part is cylindrical, and an installation groove is provided at one end of the connecting part close to the conduction part, and a partial structure of the conduction part is embedded in the installation groove.

[0011] Exemplarily, a guiding hole is provided at the bottom of the connecting cavity, and the static contact is slidably connected to the guiding hole. Among them, an electromagnetic part is provided on the static contact seat, and an elastic part is also connected between the static contact and the static contact seat. When the moving contact assembly is in the isolation position, the electromagnetic part is in a power-off state, and the static contact retracts into the guiding hole under the action of the elastic part to the retracted position. When the moving contact assembly is in the connection position, the electromagnetic part is in a powered-on state, and the static contact extends out of the guiding hole under the action of the electromagnetic part and extends to the extended position.

[0012] Exemplarily, the moving contact assembly includes a moving contact seat and a moving contact that is movable relative to the moving contact seat. A contact cavity is formed in the moving contact. When the moving contact assembly is in the isolation position, the moving contact and the static contact are separated from each other. When the moving contact assembly is in the connection position, at least a partial structure of the moving contact extends into the connecting cavity, and the static contact contacts and conducts with the contact cavity.

[0013] Exemplarily, the moving contact assembly further includes a driving assembly. A sliding cavity is formed in the moving contact seat. At least a partial structure of the driving assembly extends into the sliding cavity and drives the moving contact to slide in the sliding cavity. When the moving contact assembly is in the connection position, at least a partial structure of the moving contact is located outside the sliding cavity.

[0014] Exemplarily, the static contact assembly includes N static contact seats and N static contacts, and the static contacts and the static contact seats correspond to each other one by one. The moving contact assembly includes N moving contact seats and N moving contacts, and the moving contacts and the moving contact seats are arranged corresponding to each other one by one, and the moving contacts and the static contacts correspond to each other one by one. N is a natural number not less than 1.

[0015] Exemplarily, the moving contact assembly further includes a driving assembly. A sliding cavity is formed in each moving contact seat. At least a partial structure of the driving assembly extends into each sliding cavity. The driving assembly is connected to each moving contact and drives the N moving contacts to move together.

[0016] Exemplarily, N is 3. The static contact assembly includes first connecting columns that are connected to the static contact seats one by one. A second connecting column is correspondingly provided at one end of each first connecting column away from the static contact seat. The second connecting column is inclined relative to the corresponding first connecting column. One end of the second connecting column away from the corresponding first connecting column is used to communicate with an external circuit. The three first connecting columns satisfy the parallel condition with each other, and the inclination direction of at least one of the three second connecting columns is different from the inclination directions of the other two second connecting columns.

[0017] Exemplarily, N is 3. The moving contact assembly includes a mounting base, on which three third connection posts are provided. Each third connection post is correspondingly connected to a moving contact seat. The three moving contact seats all extend obliquely relative to the mounting base and the extending directions thereof satisfy the parallel condition. The extending directions of the three sliding cavities are the same as the extending directions of their corresponding moving contact seats.

[0018] Exemplarily, the three third connection posts are all bent and arranged in an interleaved manner with each other.

[0019] Exemplarily, the moving contact assembly further includes a driving assembly, which is connected to the moving contact seat and drives the moving contact seat to rotate.

[0020] Exemplarily, along the circumferential direction of the connection cavity, a plurality of contact pieces spaced apart from each other are arranged in the connection cavity. When the moving contact assembly is in the connected working position, the contact pieces are in contact with the outer wall of the moving contact to conduct electricity.

[0021] According to another aspect of the present invention, an electrical device is further provided. The electrical device includes a housing and any one of the above-mentioned sulfur hexafluoride-nitrogen fusion medium isolation devices. The sulfur hexafluoride-nitrogen fusion medium isolation device is arranged in the housing, and the housing is filled with a fusion medium, which includes sulfur hexafluoride and nitrogen.

[0022] Exemplarily, the volume of sulfur hexafluoride accounts for 20% - 40% of the volume of the fusion medium.

[0023] A series of simplified concepts are introduced in the summary of the invention, which will be further described in detail in the detailed implementation part. The summary of the invention is not intended to attempt to define the key features and essential technical features of the claimed technical solution, nor is it intended to attempt to determine the protection scope of the claimed technical solution.

[0024] For the sulfur hexafluoride-nitrogen fusion medium isolation device provided by the present application, through the setting of the static contact, the ablation of the static contact seat during the switching of the moving contact assembly at different working positions (i.e., during the opening and closing operation of the device) is reduced, and the overall electrical life of the device is guaranteed. Compared with the isolation device using pure sulfur hexafluoride as the medium, the sulfur hexafluoride-nitrogen fusion medium isolation device provided by the present application can be applied to electrical devices using a fusion medium of sulfur hexafluoride and nitrogen. The proportion of sulfur hexafluoride is less, and it is more low-carbon and environmentally friendly on the premise of ensuring the electrical life.

[0025] The advantages and features of the present invention will be described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following drawings of the present invention are used as a part of the present invention to understand the present invention. The embodiments and descriptions thereof shown in the drawings are used to explain the principles of the present invention. In the drawings, Figure 1 A perspective view of a sulfur hexafluoride-nitrogen fusion medium isolation device according to an exemplary embodiment of the present invention; Figure 2 A side view of a sulfur hexafluoride-nitrogen fusion medium isolation device according to an exemplary embodiment of the present invention; Figure 3 A perspective view of a sulfur hexafluoride-nitrogen fusion medium isolation device according to an exemplary embodiment of the present invention; Figure 4 A sectional view of a static contact assembly according to an exemplary embodiment of the present invention; Figure 5 A sectional view of a sulfur hexafluoride-nitrogen fusion medium isolation device according to an exemplary embodiment of the present invention.

[0027] Wherein, the above-mentioned drawings include the following reference numerals: 10, sulfur hexafluoride-nitrogen fusion medium isolation device; 110, moving contact assembly; 1110, moving contact seat; 1120, moving contact; 1130, transmission member; 1140, mounting seat; 1150, third connecting column; 120, static contact assembly; 1210, static contact seat; 1211, connection cavity; 1212, contact piece; 1220, static contact; 1230, first connecting column; 1240, second connecting column; 1221, conduction part; 1222, connection part. Detailed implementation manners

[0028] In the following description, a large number of details are provided to thoroughly understand the present invention. However, those skilled in the art can understand that the following description only exemplarily shows the preferred embodiments of the present invention, and the present invention can be implemented without one or more such details. In addition, in order to avoid confusion with the present invention, some well-known technical features in the art are not described in detail.

[0029] In the embodiments of the present invention, a sulfur hexafluoride-nitrogen fusion medium isolation device is provided. With reference to Figure 1 , Figure 2 and Figure 4, the sulfur hexafluoride-nitrogen mixed medium isolation device 10 may include a moving contact assembly 110 and a static contact assembly 120. The static contact assembly 120 may include a static contact seat 1210 and a static contact 1220. A connection cavity 1211 opening towards the moving contact assembly 110 may be formed in the static contact seat 1210. The static contact 1220 is connected to the bottom of the connection cavity 1211 and extends towards the moving contact assembly 110. The static contact 1220 is slidably connected to the static contact seat 1210. When the static contact 1220 is in the extended position relative to the static contact seat 1210, the end of the static contact 1220 close to the moving contact assembly 110 protrudes from the static contact seat 1210. The moving contact assembly 110 may have an isolation position and a connection position relative to the static contact seat 1210. When the moving contact assembly 110 is in the isolation position, the moving contact assembly 110 and the static contact 1220 may be separated from each other. When the moving contact assembly 110 is in the connection position, at least part of the structure of the moving contact assembly 110 may extend into the connection cavity 1211 and contact and conduct with the static contact 1220. The structure of the connection cavity 1211 may be adapted to the structure of the part where the moving contact assembly 110 is inserted. The connection cavity 1211 may provide an accurate insertion path and position for the moving contact assembly 110, ensuring that the moving contact assembly 110 can accurately contact the static contact assembly 120, ensuring good alignment and reliable connection between the two, so as to achieve stable circuit connection. The connection cavity 1211 may isolate the contact part of the moving contact assembly 110 and the static contact assembly 120 from the external environment, preventing impurities such as dust and water vapor from entering the gap between the two, avoiding adverse effects of impurities on the conductivity and contact performance of the device, and ensuring the safety and reliability of the device operation. The sulfur hexafluoride-nitrogen mixed medium isolation device 10 may be applied to a fully enclosed gas-insulated switchgear (GIS).

[0030] The static contact assembly 120 is connected to one side of the circuit, and the moving contact assembly 110 is connected to the other side of the circuit. In the connecting position, the static contact 1220 is in contact with the moving contact assembly 110, that is, the circuit is connected. In the disconnecting position, the moving contact assembly 110 is separated from the static contact 1220, that is, the circuits on both sides are disconnected. The switching of different positions can be achieved by moving the moving contact assembly 110 relative to the static contact assembly 120. In the process of switching the moving contact assembly 110 from the connecting position to the disconnecting position, the moving contact assembly 110 and the static contact assembly 120 are gradually separated. Since the static contact 1220 protrudes from the static contact seat 1210, that is, the static contact seat 1210 is first separated from the moving contact assembly 110, and then the static contact 1220 is separated from the moving contact assembly 110. In this way, the arc generated between the static contact assembly 120 and the moving contact assembly 110 is concentrated on the end of the static contact 1220 facing the moving contact assembly 110, and the static contact 1220 can play the role of arc initiation, so that the arc shape is within a reasonable range. The static contact 1220 can be made of a conductive material that is resistant to ablation, and the ablation is concentrated on the static contact 1220, which can reduce the ablation of various parts of the static contact seat 1210 and improve the overall electrical life of the sulfur hexafluoride nitrogen fusion medium isolation device 10. After multiple experimental verifications, the electrical life of the sulfur hexafluoride nitrogen fusion medium isolation device 10 provided in this application is higher than the standard 100 times opening and closing electrical life test requirement.

[0031] The sulfur hexafluoride nitrogen fusion medium partition device 10 provided in the present application reduces the ablation of the static contact seat 1210 when the moving contact assembly 110 switches between different workstations (i.e., the device is in the process of opening and closing) through the setting of the static contact 1220, thereby ensuring the overall electrical life of the device. Compared with the partition device using pure sulfur hexafluoride as the medium, the sulfur hexafluoride nitrogen fusion medium partition device 10 provided in the present application can be applied to electrical equipment using a fusion medium of sulfur hexafluoride and nitrogen, with a smaller proportion of sulfur hexafluoride, which is more low-carbon and environmentally friendly while ensuring the electrical life.

[0032] For example, in conjunction with reference Figure 2 , Figure 4 and Figure 5, one end of the static contact 1220 close to the moving contact assembly 110 may be formed with a conduction part 1221, and at least part of the structure of the conduction part 1221 may be made of a nickel-based alloy material. One end of the static contact 1220 close to the moving contact assembly 110 protrudes from the static contact base 1210, that is, the conduction part 1221 protrudes from the static contact base 1210. The nickel-based alloy material has high impedance characteristics. During the opening and closing process, the high impedance characteristics of the conduction part 1221 arranged in this way can reduce the arc current until it goes out. The nickel-based alloy material has good ablation resistance and a relatively high melting point. In the high-temperature environment generated by the arc, it can maintain good thermal stability, reduce the melting and evaporation of the material, and thus effectively extend the service life of the static contact 1220, ensuring reliable operation even in frequent electrical operations. In addition, the nickel-based alloy material has good electrical conductivity and thermal conductivity, can effectively reduce power loss and heat generation, has high strength, good toughness, excellent wear resistance and corrosion resistance, can withstand frequent on-off operations and the influence of harsh environments, is not easily corroded and worn, and can maintain stable contact performance.

[0033] Exemplarily, with reference to Figure 3 , Figure 4 and Figure 5 , the end of the conduction part 1221 facing the moving contact assembly 110 may be arc-shaped. The arc-shaped setting can make the electric field distribution on the surface of the static contact 1220 more uniform. When an arc is generated when the static contact 1220 is separated from the moving contact assembly 110, the arc-shaped structure is beneficial to the rapid diffusion of the arc on the surface. The static contact 1220 can better withstand the mechanical stress during the opening and closing process, so that the static contact 1220 is not prone to mechanical damages such as deformation and cracks during long-term use, ensuring the normal operation of the static contact assembly 120 and the stability of the electrical performance.

[0034] Exemplarily, with reference to Figure 2 , Figure 4 and Figure 5 , the static contact 1220 may further include a connecting part 1222 connected between the conduction part 1221 and the bottom of the connecting cavity 1211. The connecting part 1222 may be made of copper material. When the moving contact assembly 110 is in the connected working position, the moving contact assembly 110 is in contact and conduction with the conduction part 1221, and the moving contact assembly 110 is in contact and conduction with the connecting part 1222. That is to say, the moving contact assembly 110 can be in contact and conduction with both the conduction part 1221 and the connecting part 1222. In this way, the contact area between the moving contact assembly 110 and the static contact assembly 120 can be increased, the contact resistance between the moving contact assembly 110 and the static contact assembly 120 is smaller, and the current-carrying capacity is stronger. Exemplarily, the connecting part 1222 may be a copper alloy.

[0035] Exemplarily, with reference to Figure 4 and Figure 5, on the outer peripheral surface of the static contact 1220, along the radial direction of the static contact 1220, the length of the conduction part 1221 accounts for 3% - 40% of the length of the static contact 1220. For example, the length of the conduction part 1221 can account for 3%, 5%, 10%, 20%, 30% or 40% etc. of the length of the static contact 1220. In this way, the ablation resistance and conductivity of the static contact 1220 can be better guaranteed.

[0036] Exemplarily, with reference to Figure 1 , Figure 2 and Figure 5 , the connecting part 1222 is cylindrical, and an installation groove is provided at one end of the connecting part 1222 close to the conduction part 1221, and a partial structure of the conduction part 1221 is embedded in the installation groove. A protruding installation rib can be provided at the center of the conduction part 1221, and the installation rib is inserted into the installation groove. To ensure the stable connection between the static contact 1220 and the static contact seat 1210. The contact area between the static contact 1220 and the static contact seat 1210 is larger, and the conduction effect is better.

[0037] Exemplarily, a guiding hole can be provided at the bottom of the connection cavity 1211, and the static contact is slidably connected to the guiding hole. Among them, an electromagnetic component is provided on the static contact seat 1210, and an elastic component is also connected between the static contact 1220 and the static contact seat 1210. The static contact 1220 has an extended working position and a retracted working position. When the static contact 1220 is in the extended working position, one end of the static contact 1220 close to the moving contact assembly 110 protrudes from the static contact seat 1210. When the static contact 1220 is in the retracted working position, the static contact 1220 retracts into the guiding hole, and one end of the static contact 1220 close to the moving contact assembly 110 does not protrude from the bottom of the connection cavity 1211. When the moving contact assembly 110 is in the cut-off working position, the electromagnetic component is in a power-off state, and the static contact 1220 retracts into the guiding hole to the retracted working position under the action of the elastic component. When the moving contact assembly 110 is in the connected working position, the static contact assembly 120 and the moving contact assembly 110 are connected, and at this time the circuit is connected, and power is supplied to the electromagnetic component, that is, the electromagnetic component is in a powered-on state, and the static contact 1220 extends out of the guiding hole and extends to the extended working position under the action of the electromagnetic component. That is to say, both the moving contact assembly 110 and the static contact assembly 120 are designed to be movable. During the power-off process, the static contact 1220 can quickly retract into the guiding hole, and at the same time the moving contact assembly 110 moves. In this way, the double movement accelerates the separation process, greatly shortens the power-off time, and effectively improves the circuit breaking efficiency and safety. When the static contact 1220 is in the retracted empty position, the static contact 1220 is located in the guiding hole, so that the distance between the moving contact assembly 110 in the cut-off working position and the static contact 1220 is farther, and the insulation effect is better.

[0038] Exemplarily, with reference to Figure 1 , Figure 2 and Figure 5, the moving contact assembly 110 includes a moving contact base 1110 and a moving contact 1120 that is movable relative to the moving contact base 1110. A contact cavity is formed in the moving contact 1120. When the moving contact assembly 110 is in the disconnected position, the moving contact 1120 and the static contact 1220 are separated from each other. When the moving contact assembly 110 is in the connected position, at least a part of the structure of the moving contact 1120 extends into the connection cavity 1211, and the static contact 1220 contacts and conducts with the contact cavity. That is to say, at least a part of the structure of the moving contact 1120 can be inserted into the connection cavity 1211, and at least a part of the structure of the static contact 1220 can be inserted into the contact cavity. The connection cavity 1211 can limit the moving contact 1120 to a certain extent, making the connection stability between the moving contact assembly 110 and the static contact assembly 120 better. Similarly, the contact cavity can limit the static contact 1220 to a certain extent, further ensuring the connection stability between the moving contact assembly 110 and the static contact assembly 120. The setting of the contact cavity can increase the contact area between the moving contact 1120 and the static contact 1220. Exemplarily, the moving contact 1120 can be a cylindrical shape with one end open, and the static contact 1220 can be generally cylindrical. The moving contact 1120 moves to insert the static contact 1220 into the contact cavity or withdraw it from the contact cavity. Exemplarily, along the circumferential direction of the connection cavity 1211, a plurality of contact pieces spaced apart from each other can be provided in the connection cavity 1211. When the moving contact assembly 110 is in the connected position, the contact pieces contact and conduct with the outer wall of the moving contact 1120. By reasonably setting the structures of the connection cavity 1211 and the contact pieces, each contact piece can contact and conduct with the outer wall of the moving contact 1120. In this way, the number of contact points can be increased, the contact resistance can be reduced, and it can be ensured that the current can pass stably and reliably. Exemplarily, an elastic member can be connected to the contact piece to maintain the pressure of the contact piece on the moving contact 1120, ensuring that during long-term use, even under the action of vibration or other external forces, a good contact state can be maintained between the contact piece and the moving contact 1120, and there will be no poor contact situation.

[0039] Exemplarily, with reference to Figure 1 、 Figure 2 and Figure 3, the moving contact assembly 110 may further include a driving assembly. A sliding cavity may be formed in the moving contact seat 1110. At least part of the driving assembly may extend into the sliding cavity and drive the moving contact 1120 to slide in the sliding cavity. When the moving contact assembly 110 is in the connected position, at least part of the moving contact 1120 is located outside the sliding cavity. When the moving contact assembly 110 is in the disconnected position, the moving contact 1120 may be completely located inside the sliding cavity. The driving assembly may include a driving member and a transmission member 1130. The transmission member 1130 may extend into the sliding cavity to drive the moving contact 1120 to slide. In this way, through the driving assembly and the sliding cavity, the moving contact 1120 is moved within a predetermined trajectory, thereby realizing the connection and disconnection of the circuit, and the process reliability is higher. The transmission member 1130 may include a gear and a rack. The transmission member 1130 is connected to the end of the moving contact 1120 to drive the moving contact 1120 to move.

[0040] Exemplarily, with reference to Figure 1 and Figure 2 , the static contact assembly 120 may include N static contact seats 1210 and N static contacts 1220. The static contacts 1220 and the static contact seats 1210 may be in one-to-one correspondence respectively. The moving contact assembly 110 may include N moving contact seats 1110 and N moving contacts 1120. The moving contacts 1120 and the moving contact seats 1110 may be arranged in one-to-one correspondence respectively, and the moving contacts 1120 and the static contacts 1220 are in one-to-one correspondence respectively. N is a natural number not less than 1. That is to say, the sulfur hexafluoride-nitrogen fusion medium disconnector 10 can control the on-off of multiple circuits. The multiple circuits can be understood as different phases or different branches. Exemplarily, N may be 3. The sulfur hexafluoride-nitrogen fusion medium disconnector 10 as a whole may be designed with a three-phase structure, specifically including a phase A static contact assembly, a phase B static contact assembly, a phase C static contact assembly, a phase A moving contact assembly, a phase B moving contact assembly, and a phase C moving contact assembly. The transmission member 1130 of the driving assembly may be simultaneously connected to the phase A moving contact, the phase B moving contact, and the phase C moving contact.

[0041] Exemplarily, with reference to Figure 1 and Figure 2, the moving contact assembly 110 may further include a driving assembly. A sliding cavity is formed in each moving contact seat 1110. At least part of the structure of the driving assembly extends into each sliding cavity. The driving assembly is connected to each moving contact 1120 and drives the N moving contacts 1120 to move together. This is especially applicable when N is not less than 2. The driving assembly can drive multiple moving contacts 1120 to move together, ensuring the consistency and synchronism of the actions of multiple contacts. Each phase or each branch can be operated simultaneously, avoiding the situation of sequential on-off, reducing problems such as excessive arc generated due to non-synchronization, and improving the electrical performance and reliability of the device. The setting of the driving assembly can also simplify the structure of the device, reduce the number of structural parts, lower costs and the volume of the device, make the overall structure of the device more compact, and is beneficial to improving space utilization and installation convenience.

[0042] Exemplarily, with reference to Figure 1 , Figure 2 and Figure 3 , when N is 3, the static contact assembly 120 may include first connection columns 1230 connected to the static contact seats 1210 in a one-to-one correspondence. At the end of each first connection column 1230 far from the static contact seat 1210, a second connection column 1240 may be correspondingly provided. The second connection column 1240 is inclined with respect to the corresponding first connection column 1230. The end of the second connection column 1240 far from the corresponding first connection column 1230 is used to communicate with an external circuit. The three first connection columns 1230 satisfy the parallel condition with each other. The inclination direction of at least one of the three second connection columns 1240 is different from the inclination directions of the other two second connection columns 1240. This layout method can reasonably arrange the static contacts 1220 of three phases in a limited space, realize the functions of a three-phase circuit, make the overall structure more compact, save space, and facilitate the miniaturization and integration of the whole device. Moreover, such a setting facilitates the connection of the static contact assembly 120 to external lines in different directions, the connection can be more flexible, reducing line crossing and overlong wiring, and lowering the loss and failure risk.

[0043] Exemplarily, with reference to Figure 1 , Figure 2 and Figure 3, when N is 3, the moving contact assembly 110 may include a mounting base 1140. Three third connecting posts 1150 may be provided on the mounting base 1140, and each third connecting post 1150 may be correspondingly connected to a moving contact seat 1110. Each moving contact seat 1110 is connected to the other side of the external circuit through the third connecting post 1150 (that is, the static contact seat 1210 is connected to one side of the external circuit, and the moving contact seat 1110 is connected to the other side of the external circuit). The three moving contact seats 1110 may all extend obliquely relative to the mounting base 1140 and the extending directions thereof satisfy the parallel condition with each other. The extending directions of the three sliding cavities are the same as the extending directions of their corresponding moving contact seats 1110. In this way, the moving contact 1120 moves obliquely instead of vertically, which can achieve a larger stroke in a smaller space, improve the opening and closing speed between the moving contact 1120 and the static contact seat 1210, enhance the arc extinguishing ability, and at the same time is beneficial to optimizing the electric field distribution, reducing the ablation of the static contact 1220 and the moving contact 1120 by the arc, improving the service life and the reliability of the electrical equipment, and making the structural design more compact, facilitating installation and maintenance.

[0044] Exemplarily, with reference to Figure 1 , Figure 2 and Figure 3 , when N is 3, the three third connecting posts 1150 may all be bent and arranged in an interleaved manner. With such an arrangement, the structure is more compact, reasonably arranged in a limited space, and the space utilization rate is improved.

[0045] Exemplarily, with reference to Figure 2 , the moving contact assembly 110 further includes a driving assembly, and the driving assembly is connected to the moving contact seat 1110 and drives the moving contact seat 1110 to rotate. Specifically, when the moving contact assembly 110 is in the disconnection position, the driving member drives the moving contact seat 1110 to rotate, so that the included angle between the moving contact seat 1110 and the mounting base 1140 gradually increases, and the distance between the moving contact 1120 and the static contact assembly 120 increases. In this way, the separation between the moving contact 1120 and the static contact 1220 is accelerated, and the breaking efficiency and safety of the circuit are improved. The distance between the rotated moving contact assembly 110 and the static contact 1220 is farther, and the insulation effect is better.

[0046] Exemplarily, with reference to Figure 1 , Figure 4 and Figure 5, along the circumferential direction of the connection cavity 1211, a plurality of contact pieces 1212 spaced from each other can be arranged in the connection cavity 1211. When the moving contact assembly 110 is in the connected working position, the contact pieces 1212 are in contact conduction with the outer wall of the moving contact 1120. The contact pieces 1212 can better ensure reliable electrical connection. The contact pieces 1212 are in close contact with the moving contact 1120 to form a low-resistance conductive path, allowing current to pass smoothly. The arrangement of the contact pieces 1212 increases the contact area between the two, reducing power loss and heat generation. Exemplarily, the contact pieces 1212 can be connected with an elastic structure. Further ensuring the tight connection between the contact pieces 1212 and the moving contact 1120, buffering the impact force during closing and opening, reducing mechanical wear, and prolonging the contact life. The setting of the elastic structure enables the moving contact 1120 to adapt to pressure and temperature changes under different working conditions, always maintaining good contact and ensuring the reliability of the contact. Even if the contact has wear or other conditions, it can compensate through its own elastic deformation to prevent contact failure from causing faults.

[0047] When receiving the opening command, the driving assembly drives the N moving contacts 1120 to move, including the following three stages: In the first stage, the moving contact assembly 110 is separated from the static contact assembly 120, and a small current arc is generated between the moving contact 1120 and the static contact 1220. Since the conduction portion 1221 protrudes from the static contact seat 1210, the arc root of the arc starting is at the end of the conduction portion 1221 facing the moving contact 1120. In the second stage, as the gap between the moving contact 1120 and the static contact 1220 gradually increases, the arc gradually elongates, and the arc shape becomes violently unstable. Under the action of the electrodynamic force, a floating arc phenomenon is likely to occur. Since the arc root is always at the end of the conduction portion 1221 facing the moving contact 1120, and at least part of the structure of the conduction portion 1221 is made of nickel-based alloy material, even if a floating arc occurs, the arc can still be in a controllable area. As the gap increases, the impedance characteristic causes the arc current to gradually decrease to extinction, minimizing the ablation of the static contact seat 1210. In the third stage, as Figure 1 , the moving contact 1120 completely retracts into the moving contact seat 1110, the sulfur hexafluoride-nitrogen fusion medium isolation device 10 completes the opening, and the bus transfer current process is completed.

[0048] According to another aspect of the present invention, an electrical device is further provided. The electrical device may include a housing and any one of the above-mentioned sulfur hexafluoride-nitrogen hybrid medium isolation devices 10. The sulfur hexafluoride-nitrogen hybrid medium isolation device 10 may be disposed inside the housing, and the housing may be filled with a hybrid medium, which includes sulfur hexafluoride and nitrogen. The housing is completely isolated from the outside. Since the sulfur hexafluoride-nitrogen hybrid medium isolation device 10 adopts the technical solution of any one of the above embodiments, the electrical device at least has the beneficial effects brought by the technical solution of the above embodiments, which will not be elaborated herein one by one.

[0049] Exemplarily, the volume of sulfur hexafluoride accounts for 20% - 40% of the volume of the hybrid medium. For example, the volume of sulfur hexafluoride accounts for 20%, 30% or 40% of the volume of the hybrid medium, etc. Preferably, the volume of sulfur hexafluoride accounts for 30% of the volume of the hybrid medium. For different volume ratios of sulfur hexafluoride, multiple bus transfer current breaking tests were carried out, the comparative analysis of the arcing time during the bus transfer current breaking process at different volume ratios was collected, and the ablation situation of the static contact assembly 120 was analyzed. Considering the requirements of low-carbon environmental protection, it was determined that when the volume of sulfur hexafluoride accounts for 30% of the volume of the hybrid medium, it is the best.

[0050] For the commonly used isolation devices with pure sulfur hexafluoride in the market, the bus transfer current technical parameter is 30V / 1600A, which cannot meet the on-site application technical level. The sulfur hexafluoride-nitrogen hybrid medium isolation device 10 provided in this application can safely open and close the bus transfer current technical parameter of 120V / 2000A when the volume of sulfur hexafluoride accounts for 30% of the volume of the hybrid medium, which can meet the on-site application technical level.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front", "rear", "upper", "lower", "left", "right", "lateral", "vertical", "perpendicular", "horizontal" and "top", "bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the protection scope of the present invention; the orientation words "inside" and "outside" refer to the inside and outside relative to the contour of each component itself.

[0052] For ease of description, regional relative terms such as "above", "over", "on the upper surface", "upper" etc. can be used here to describe the regional positional relationship of one or more components or features shown in the figures with other components or features. It should be understood that regional relative terms not only include the orientation of components described in the figures, but also different orientations during use or operation. For example, if the components in the attached drawings are inverted as a whole, the components "above other components or features" or "over other components or features" will include the situation where the components are "below other components or structures" or "under other components or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". In addition, these components or features can also be positioned at other different angles (such as rotated 90 degrees or other angles), and this document intends to cover all such situations.

[0053] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, components, assemblies and / or combinations thereof.

[0054] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present application are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0055] The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are only for the purpose of exemplification and illustration, and are not intended to limit the present invention within the scope of the described embodiments. In addition, those skilled in the art can understand that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of protection required by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalent scope.

Claims

1. A sulfur hexafluoride-nitrogen fusion medium isolation device, characterized in that, It includes a moving contact assembly and a static contact assembly. The static contact assembly includes a static contact seat and a static contact. A connection cavity opening towards the moving contact assembly is formed in the static contact seat. The static contact is connected to the bottom of the connection cavity and extends towards the moving contact assembly. The static contact is slidably connected to the static contact seat. When the static contact is in the extended position relative to the static contact seat, the end of the static contact close to the moving contact assembly protrudes from the static contact seat. The moving contact assembly has a disconnection position and a connection position relative to the static contact assembly. When the moving contact assembly is in the disconnection position, the moving contact assembly and the static contact are separated from each other. When the moving contact assembly is in the connection position, at least part of the structure of the moving contact assembly extends into the connection cavity and contacts and conducts with the static contact.

2. The sulfur hexafluoride-nitrogen fusion medium partition device according to claim 1, wherein A conduction part is formed at the end of the static contact close to the moving contact assembly, and at least part of the structure of the conduction part is made of a nickel-based alloy material.

3. The sulfur hexafluoride-nitrogen fusion medium isolation device according to claim 2, wherein, The end of the conduction part facing the moving contact assembly is arc-shaped.

4. The sulfur hexafluoride-nitrogen fusion medium isolation device according to claim 2, characterized in that, The static contact further includes a connection part connected between the conduction part and the bottom of the connection cavity. The connection part is made of copper material. When the moving contact assembly is in the connection position, the moving contact assembly contacts and conducts with the conduction part, and the moving contact assembly also contacts and conducts with the connection part.

5. The sulfur hexafluoride-nitrogen fusion medium partition device according to claim 4, characterized in that, On the outer peripheral surface of the static contact, along the radial direction of the static contact, the length of the conduction part accounts for 3% - 40% of the length of the static contact.

6. The sulfur hexafluoride-nitrogen fusion medium partition device according to claim 4, wherein, The connection part is cylindrical, and an installation groove is provided at one end of the connection part close to the conduction part, and part of the structure of the conduction part is embedded in the installation groove.

7. The sulfur hexafluoride-nitrogen fusion medium isolation device according to claim 1, wherein A guiding hole is provided at the bottom of the connection cavity, and the static contact is slidably connected to the guiding hole. Among them, an electromagnetic component is provided on the static contact seat, and an elastic component is also connected between the static contact and the static contact seat. When the moving contact assembly is in the disconnection position, the electromagnetic component is in a power-off state, and the static contact retracts into the guiding hole to the retracted position under the action of the elastic component. When the moving contact assembly is in the connection position, the electromagnetic component is in a powered-on state, and the static contact extends out of the guiding hole and extends to the extended position under the action of the electromagnetic component.

8. The sulfur hexafluoride-nitrogen fusion medium isolation device according to any one of claims 1 to 7, characterized in that, The moving contact assembly includes a moving contact seat and a moving contact that is movable relative to the moving contact seat. A contact cavity is formed in the moving contact. When the moving contact assembly is in the disconnection position, the moving contact and the static contact are separated from each other. When the moving contact assembly is in the connection position, at least part of the structure of the moving contact extends into the connection cavity, and the static contact contacts and conducts with the contact cavity.

9. The sulfur hexafluoride-nitrogen fusion medium partition device according to claim 8, wherein, The moving contact assembly further includes a driving assembly. A sliding cavity is formed in the moving contact seat. At least part of the structure of the driving assembly extends into the sliding cavity and drives the moving contact to slide in the sliding cavity. When the moving contact assembly is in the connection position, at least part of the structure of the moving contact is located outside the sliding cavity.

10. The sulfur hexafluoride-nitrogen fusion medium partition device according to claim 8, characterized in that, The static contact assembly includes N static contact seats and N static contacts, the static contacts and the static contact seats are in one-to-one correspondence respectively, the moving contact assembly includes N moving contact seats and N moving contacts, the moving contacts and the moving contact seats are in one-to-one correspondence respectively, and the moving contacts and the static contacts are in one-to-one correspondence respectively, where N is a natural number not less than 1.

11. The sulfur hexafluoride-nitrogen fusion medium isolation device according to claim 10, characterized in that, The moving contact assembly further includes a driving assembly. A sliding cavity is formed in each of the moving contact seats, at least part of the structure of the driving assembly extends into each of the sliding cavities, the driving assembly is connected to each of the moving contacts and drives the N moving contacts to move together.

12. The sulfur hexafluoride-nitrogen fusion medium partition device according to claim 10, wherein, N is 3. The static contact assembly includes first connecting columns connected to the static contact seats in one-to-one correspondence. A second connecting column is correspondingly arranged at one end of each first connecting column away from the static contact seat. The second connecting column is inclined with respect to the corresponding first connecting column, and one end of the second connecting column away from the corresponding first connecting column is used for communicating with an external circuit. The three first connecting columns satisfy the parallel condition with each other, and the inclination direction of at least one of the three second connecting columns is different from the inclination directions of the other two second connecting columns.

13. The sulfur hexafluoride-nitrogen fusion medium isolation device according to claim 10, characterized in that, N is 3. The moving contact assembly includes a mounting seat. Three third connecting columns are arranged on the mounting seat. Each third connecting column is correspondingly connected to a moving contact seat. The three moving contact seats all extend obliquely with respect to the mounting seat and the extending directions satisfy the parallel condition with each other. The extending directions of the three sliding cavities are the same as the extending directions of their corresponding moving contact seats.

14. The sulfur hexafluoride-nitrogen fusion medium isolation device according to claim 13, characterized in that, The three third connecting columns are all bent and arranged in a staggered manner with each other.

15. The sulfur hexafluoride-nitrogen fusion medium partition device according to claim 8, wherein, The moving contact assembly further includes a driving assembly. The driving assembly is connected to the moving contact seat and drives the moving contact seat to rotate.

16. The sulfur hexafluoride-nitrogen fusion medium partition device according to claim 8, wherein, Along the circumferential direction of the connection cavity, a plurality of contact pieces are arranged in the connection cavity at intervals. When the moving contact assembly is in the connection working position, the contact pieces are in contact conduction with the outer wall of the moving contact.

17. An electrical device, characterized in that, It includes a housing and the sulfur hexafluoride-nitrogen fusion medium isolation device according to any one of claims 1 to 16. The sulfur hexafluoride-nitrogen fusion medium isolation device is arranged in the housing. The housing is filled with a fusion medium, and the fusion medium includes sulfur hexafluoride and nitrogen.

18. The electrical device according to claim 17, characterized in that, The volume of the sulfur hexafluoride accounts for 20% - 40% of the volume of the fusion medium.

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