A sulfur hexafluoride nitrogen fusion medium isolation device and electrical equipment

Abstract

The present invention provides a sulfur hexafluoride nitrogen fusion medium isolation device and electrical equipment. The sulfur hexafluoride nitrogen fusion medium isolation 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 connecting cavity facing the moving contact assembly is formed in the static contact seat. The static contact is connected to the bottom of the connecting cavity and extends toward the moving contact assembly. One 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. In this way, it can be applied to electrical equipment using a fusion medium of sulfur hexafluoride and nitrogen. The proportion of sulfur hexafluoride is smaller, and it is more low-carbon and environmentally friendly while ensuring the electrical life.

Description

Technical Field

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

[0002] In modern power systems, many busbar switching operations are involved. As a key device in busbar switching operations, the disconnector greatly affects the safety of the power system.

[0003] Currently, disconnect devices typically use a combination of dynamic and static contacts to switch busbar currents. To ensure safety during the switching process, 99.9% pure sulfur hexafluoride gas is typically used as the insulating and arc-extinguishing medium.

[0004] To make power systems more environmentally friendly and less carbon-intensive, the proportion of sulfur hexafluoride in the dielectric medium is minimized. However, this reduction can lead to a number of issues, including reduced insulation performance of disconnect devices, reduced busbar current switching performance, and more severe contact erosion. 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 isolation device is provided. The sulfur hexafluoride nitrogen fusion medium isolation 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 connecting cavity is formed in the static contact seat and faces the opening of the moving contact assembly, the static contact is connected to the cavity bottom of the connecting cavity and extends toward the moving contact assembly, the static contact is slidably connected to the static contact seat, when the static contact is in an extended position relative to the static contact seat, one 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 connecting cavity and contacts and conducts with the static contact.

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

[0007] Exemplarily, the end of the conducting portion facing the moving contact assembly is in an arc shape.

[0008] Exemplarily, the static contact also includes a connecting portion connected between the conductive portion and the bottom of the connecting cavity, and the connecting portion is made of copper material. When the moving contact assembly is in the connecting position, the moving contact assembly is in contact with the conductive portion and is connected, and the moving contact assembly is in contact with the connecting portion and is connected.

[0009] Exemplarily, on the outer peripheral surface of the static contact, along the axial direction of the static contact, the length of the conducting portion accounts for 3% to 40% of the length of the static contact.

[0010] Exemplarily, the connecting portion is cylindrical, and a mounting groove is provided at one end of the connecting portion close to the conducting portion, and a part of the structure of the conducting portion is embedded in the mounting groove.

[0011] Exemplarily, a guide hole is provided at the bottom of the connecting cavity, and the static contact is slidably connected to the guide hole, wherein 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 isolating position, the electromagnetic component is in a power-off state, and the static contact is retracted into the guide hole at the retracted position under the action of the elastic component. When the moving contact assembly is in the connecting position, the electromagnetic component is in a power-on state, and the static contact is extended out of the guide hole and to the extending position under the action of the electromagnetic component.

[0012] Exemplarily, the moving contact assembly includes a moving contact base and a moving contact movable relative to the moving contact base, a contact cavity being formed in the moving contact, and when the moving contact assembly is in the isolating position, the moving contact and the static contact are separated from each other, and when the moving contact assembly is in the connecting position, at least part of the structure of the moving contact extends into the connecting cavity, and the static contact is in contact and conductive with the contact cavity.

[0013] Exemplarily, the moving contact assembly also 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, and when the moving contact assembly is in the connecting position, at least part of the 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 correspond one-to-one to the static contact seats respectively. The moving contact assembly includes N moving contact seats and N moving contacts, and the moving contacts correspond one-to-one to the moving contact seats respectively. The moving contacts correspond one-to-one to the static contacts respectively, and N is a natural number not less than 1.

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

[0016] Exemplarily, N is 3, the static contact assembly includes a first connecting column connected one-to-one with the static contact seat, and a second connecting column is correspondingly provided at the 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, and the end of the second connecting column away from the corresponding first connecting column is used to connect with the external circuit, the three first connecting columns meet 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 direction of the other two second connecting columns.

[0017] Exemplarily, N is 3, the moving contact assembly includes a mounting base, three third connecting columns are provided on the mounting base, each third connecting column is connected to a corresponding moving contact base, the three moving contact bases are all inclined and extended relative to the mounting base, and the extension directions are parallel to each other, and the extension directions of the three sliding cavities are the same as the extension directions of the corresponding moving contact bases.

[0018] Exemplarily, the three third connecting pillars are bent and arranged in an interlaced manner.

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

[0020] Illustratively, a plurality of contact pieces spaced apart from each other are provided in the connecting cavity along the circumferential direction of the connecting cavity. When the moving contact assembly is in the connecting position, the contact pieces are in contact with the outer wall of the moving contact and are in conduction.

[0021] According to another aspect of the present invention, an electrical device is provided. The electrical device includes an outer shell and any one of the aforementioned sulfur hexafluoride-nitrogen fusion medium isolation devices, the sulfur hexafluoride-nitrogen fusion medium isolation device being disposed within the outer shell, and the outer shell being filled with a fusion medium comprising sulfur hexafluoride and nitrogen.

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

[0023] The Summary of the Invention introduces a series of simplified concepts that will be further described in detail in the Detailed Description of the Invention. This Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0024] The sulfur hexafluoride-nitrogen fusion medium isolation device provided in this application, through the provision of a static contact, reduces the ablation of the static contact seat when the moving contact assembly switches between different workstations (i.e., during the device's opening and closing operations), thereby ensuring the overall electrical life of the device. Compared to isolation devices using pure sulfur hexafluoride as the medium, the sulfur hexafluoride-nitrogen fusion medium isolation device provided in this application can be used in electrical equipment using a fusion medium of sulfur hexafluoride and nitrogen. The sulfur hexafluoride content is lower, making it more low-carbon and environmentally friendly while ensuring electrical life.

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

[0026] The following drawings of the present invention are hereby incorporated into the present invention for understanding the present invention. The drawings show embodiments of the present invention and their descriptions, and are used to explain the principles of the present invention. In the drawings,

[0027] Figure 1 A perspective view of a sulfur hexafluoride nitrogen fusion medium isolation device according to an exemplary embodiment of the present invention;

[0028] Figure 2 A side view of a sulfur hexafluoride nitrogen fusion medium isolation device according to an exemplary embodiment of the present invention;

[0029] Figure 3 A perspective view of a sulfur hexafluoride nitrogen fusion medium isolation device according to an exemplary embodiment of the present invention;

[0030] Figure 4 is a cross-sectional view of a stationary contact assembly according to an exemplary embodiment of the present invention;

[0031] Figure 5 2 is a cross-sectional view of a sulfur hexafluoride nitrogen fusion medium isolation device according to an exemplary embodiment of the present invention.

[0032] The above drawings include the following reference numerals:

[0033] 10. Sulfur hexafluoride nitrogen fusion dielectric 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. Connecting cavity; 1212. Contact piece; 1220. Static contact; 1230. First connecting column; 1240. Second connecting column; 1221. Conducting portion; 1222. Connecting portion. DETAILED DESCRIPTION

[0034] In the following description, a large amount of detail is provided to facilitate a thorough understanding of the present invention. However, it will be appreciated by those skilled in the art that the following description merely illustrates preferred embodiments of the present invention, and that the present invention may be practiced without one or more of these details. Furthermore, to avoid confusion with the present invention, some technical features well known in the art have not been described in detail.

[0035] The embodiment of the present invention provides a sulfur hexafluoride nitrogen fusion medium isolation device. Figure 1 、 Figure 2 and Figure 4The sulfur hexafluoride nitrogen fusion 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 connecting cavity 1211 facing 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 connecting cavity 1211 and extends toward 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 movable contact assembly 110 can have a disconnecting position and a connecting position relative to the static contact base 1210. When the movable contact assembly 110 is in the disconnecting position, the movable contact assembly 110 and the static contact 1220 can be separated from each other. When the movable contact assembly 110 is in the connecting position, at least a portion of the structure of the movable contact assembly 110 can extend into the connecting cavity 1211 and make contact and conduction with the static contact 1220. The structure of the connecting cavity 1211 can be adapted to the structure of the portion of the movable contact assembly 110 into which it is inserted. The connecting cavity 1211 can provide an accurate insertion path and position for the movable contact assembly 110, ensuring that the movable contact assembly 110 can accurately contact the static contact assembly 120, ensuring good alignment and reliable connection between the two, and thus achieving stable circuit connectivity. The connecting cavity 1211 isolates the contact portion of the moving contact assembly 110 and the stationary contact assembly 120 from the external environment, preventing impurities such as dust and moisture from entering the gap between them. This prevents impurities from adversely affecting the device's conductivity and contact performance, thereby ensuring the safety and reliability of the device's operation. The sulfur hexafluoride-nitrogen fusion dielectric isolation device 10 can be used in fully enclosed gas-insulated switchgear (GIS).

[0036] 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. Switching between 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, 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. The static contact 1220 can play the role of arc ignition, 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. 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 dielectric isolation device 10. After multiple experimental verifications, the electrical life of the sulfur hexafluoride nitrogen fusion dielectric isolation device 10 provided in this application exceeds the standard 100-time opening and closing electrical life test requirement.

[0037] The sulfur hexafluoride-nitrogen fusion medium isolation device 10 provided herein, through the provision of a static contact 1220, reduces ablation of the static contact holder 1210 during switching between different workstations of the moving contact assembly 110 (i.e., during the device's opening and closing operations), thereby ensuring the overall electrical life of the device. Compared to isolation devices using pure sulfur hexafluoride as the medium, the sulfur hexafluoride-nitrogen fusion medium isolation device 10 provided herein can be used in electrical equipment using a fusion medium of sulfur hexafluoride and nitrogen, with a lower proportion of sulfur hexafluoride, resulting in a more low-carbon and environmentally friendly design while ensuring electrical life.

[0038] For example, with reference to Figure 2 、 Figure 4 and Figure 5, a conducting portion 1221 may be formed at one end of the static contact 1220 close to the moving contact assembly 110, and at least part of the structure of the conducting portion 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 seat 1210, that is, the conducting portion 1221 protrudes from the static contact seat 1210. Nickel-based alloy materials have high impedance characteristics. During the opening and closing process, the high impedance characteristics of the conducting portion 1221 set in this way can reduce the arc current until it is extinguished. Nickel-based alloy materials have good ablation resistance and a high melting point. In the high-temperature environment generated by the arc, they 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 that it can still work reliably during frequent electrical operations. In addition, nickel-based alloy materials have good electrical and thermal conductivity, which can effectively reduce power loss and heat generation. They have high strength, good toughness, excellent wear resistance and corrosion resistance, can withstand frequent on-off operations and harsh environmental influences, are not easily corroded and worn, and can maintain stable contact performance.

[0039] For example, with reference to Figure 3 、 Figure 4 and Figure 5 , the end of the conducting portion 1221 facing the moving contact assembly 110 can be in an arc shape. The arc-shaped setting can make the electric field distribution on the surface of the static contact 1220 more uniform. When the static contact 1220 separates from the moving contact assembly 110 and an arc is generated, the arc-shaped structure is conducive 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, making the static contact 1220 less prone to mechanical damage such as deformation and cracks during long-term use, thereby ensuring the normal operation of the static contact assembly 120 and the stability of the electrical performance.

[0040] For example, with reference to Figure 2 、 Figure 4 and Figure 5 The static contact 1220 may further include a connecting portion 1222 connected between the conducting portion 1221 and the bottom of the connecting cavity 1211. The connecting portion 1222 may be made of copper. When the moving contact assembly 110 is in the connection position, the moving contact assembly 110 is in contact and conduction with the conducting portion 1221, and the moving contact assembly 110 is in contact and conduction with the connecting portion 1222. In other words, the moving contact assembly 110 may be in contact and conduction with both the conducting portion 1221 and the connecting portion 1222. In this way, the contact area between the moving contact assembly 110 and the static contact assembly 120 may be increased, the contact resistance between the moving contact assembly 110 and the static contact assembly 120 may be smaller, and the current carrying capacity may be stronger. For example, the connecting portion 1222 may be made of a copper alloy.

[0041] For example, with reference to Figure 4 and Figure 5On the outer circumference of the static contact 1220, along the axial direction of the static contact 1220, the length of the conductive portion 1221 accounts for 3% to 40% of the length of the static contact 1220. For example, the length of the conductive portion 1221 may account for 3%, 5%, 10%, 20%, 30%, or 40% of the length of the static contact 1220. In this way, the ablation resistance and electrical conductivity of the static contact 1220 can be better ensured.

[0042] For example, with reference to Figure 1 、 Figure 2 and Figure 5 The connecting portion 1222 is cylindrical, with a mounting groove provided at one end of the connecting portion 1222 near the conductive portion 1221. Part of the conductive portion 1221 is embedded within the mounting groove. A protruding mounting rib can be provided at the center of the conductive portion 1221, which inserts into the mounting groove. This ensures a stable connection between the static contact 1220 and the static contact base 1210. This increases the contact area between the static contact 1220 and the static contact base 1210, resulting in better conduction.

[0043] For example, the bottom of the connecting cavity 1211 may be provided with a guide hole, into which the static contact is slidably connected. An electromagnetic component is provided on the static contact base 1210, and an elastic component is further connected between the static contact 1220 and the static contact base 1210. The static contact 1220 has an extended position and a retracted position. When the static contact 1220 is in the extended position, the end of the static contact 1220 proximate to the movable contact assembly 110 protrudes from the static contact base 1210. When the static contact 1220 is in the retracted position, the static contact 1220 retracts into the guide hole, and the end of the static contact 1220 proximate to the movable contact assembly 110 does not protrude from the bottom of the connecting cavity 1211. When the movable contact assembly 110 is in the disconnected position, the electromagnetic component is de-energized, and the static contact 1220 retracts into the guide hole to the retracted position under the action of the elastic component. When the moving contact assembly 110 is in the connection position, the static contact assembly 120 is connected to the moving contact assembly 110. At this time, the circuit is connected and the electromagnetic component is powered, that is, the electromagnetic component is in the energized state. Under the action of the electromagnetic component, the static contact 1220 extends out of the guide hole and extends to the extension position. In other words, both the moving contact assembly 110 and the static contact assembly 120 are movable. During the power-off process, the static contact 1220 can be quickly retracted into the guide hole while the moving contact assembly 110 moves. In this way, the dual motion accelerates the separation process, greatly shortens the power-off time, and effectively improves the circuit disconnection efficiency and safety. When the static contact 1220 is in the retracted position, the static contact 1220 is located in the guide hole, which makes the distance between the moving contact assembly 110 and the static contact 1220 of the partition station farther and the insulation effect better.

[0044] For example, with reference to Figure 1 、 Figure 2 and Figure 5The 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 disconnecting position, the moving contact 1120 and the static contact 1220 are separated from each other. When the moving contact assembly 110 is in the connecting position, at least a portion of the structure of the moving contact 1120 extends into the connecting cavity 1211, and the static contact 1220 is in contact and conductive with the contact cavity. In other words, at least a portion of the structure of the moving contact 1120 can be inserted into the connecting cavity 1211, and at least a portion of the structure of the static contact 1220 can be inserted into the contact cavity. The connecting cavity 1211 can limit the moving contact 1120 to a certain extent, thereby improving the connection stability between the moving contact assembly 110 and the static contact assembly 120. Similarly, the contact cavity can limit the static contact 1220 to a certain extent, further ensuring the connection stability between the movable contact assembly 110 and the static contact assembly 120. The provision of the contact cavity can increase the contact area between the movable contact 1120 and the static contact 1220. For example, the movable contact 1120 can be cylindrical with one end open, and the static contact 1220 can be roughly cylindrical. The movable contact 1120 moves to allow the static contact 1220 to be inserted into or removed from the contact cavity.

[0045] For example, along the circumferential direction of the connecting cavity 1211, a plurality of contact pieces spaced apart from each other can be provided in the connecting cavity 1211. When the moving contact assembly 110 is in the connection position, the contact pieces are in contact and conduction with the outer wall of the moving contact 1120. By rationally setting the structure of the connecting cavity 1211 and the contact pieces, each contact piece can be in contact and conduction with the outer wall of the moving contact 1120. In this way, the contact points can be increased, the contact resistance can be reduced, and the current can be ensured to pass stably and reliably. For example, 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 if subjected to vibration or other external forces, the contact piece and the moving contact 1120 can maintain good contact without poor contact.

[0046] For example, with reference to Figure 1 、 Figure 2 and Figure 3The moving contact assembly 110 may further include a drive assembly. A sliding cavity may be formed within the moving contact base 1110. At least a portion of the drive assembly may extend into the sliding cavity and drive the moving contact 1120 to slide within the sliding cavity. When the moving contact assembly 110 is in the connection position, at least a portion of the moving contact 1120 is located outside the sliding cavity. When the moving contact assembly 110 is in the disconnection position, the moving contact 1120 may be completely located within the sliding cavity. The drive assembly may include a drive member and a transmission member 1130. The transmission member 1130 may extend into the sliding cavity to drive the moving contact 1120 to slide. Thus, through the drive assembly and the sliding cavity, the moving contact 1120 is moved within a predetermined trajectory, thereby achieving circuit connection and disconnection, and enhancing process reliability. 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.

[0047] For example, with reference to Figure 1 and Figure 2 The static contact assembly 120 may include N static contact holders 1210 and N static contacts 1220, and the static contacts 1220 may correspond one-to-one with the static contact holders 1210. The moving contact assembly 110 may include N moving contact holders 1110 and N moving contacts 1120, and the moving contacts 1120 may correspond one-to-one with the moving contact holders 1110. The moving contacts 1120 may correspond one-to-one with the static contacts 1220, and N is a natural number not less than 1. In other words, the sulfur hexafluoride nitrogen fusion dielectric isolation device 10 can control the on / off of multiple circuits, and the multiple circuits can be understood as different phases or different branches. For example, N can be 3. The sulfur hexafluoride nitrogen fusion medium isolation device 10 as a whole can be designed as 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 component 1130 of the drive assembly can be connected to the phase A moving contact, the phase B moving contact, and the phase C moving contact at the same time.

[0048] For example, with reference to Figure 1 and Figure 2The moving contact assembly 110 may also include a drive assembly. A sliding cavity is formed in each moving contact seat 1110. At least part of the structure of the drive assembly extends into each sliding cavity. The drive assembly is connected to each moving contact 1120 and drives N moving contacts 1120 to move together. It is particularly suitable for situations where N is not less than 2. The drive assembly can drive multiple moving contacts 1120 to move together to ensure the consistency and synchronization of the actions of multiple contacts. Each phase or branch can be operated at the same time to avoid the situation of successive on and off, reduce problems such as excessive arcing due to asynchrony, and improve the electrical performance and reliability of the device. The setting of the drive assembly can also simplify the structure of the device, reduce the number of structural parts, reduce costs and equipment volume, make the overall structure of the device more compact, and help improve space utilization and installation convenience.

[0049] For example, with reference to Figure 1 、 Figure 2 and Figure 3 , N is 3, and the static contact assembly 120 may include a first connecting post 1230 connected one-to-one with the static contact base 1210. Each first connecting post 1230 may be provided with a second connecting post 1240 at the end distal from the static contact base 1210. The second connecting post 1240 is arranged at an angle relative to the corresponding first connecting post 1230, and the end distal from the corresponding first connecting post 1230 is configured to communicate with an external circuit. The three first connecting posts 1230 are parallel to each other, and at least one of the three second connecting posts 1240 has a different inclination than the other two second connecting posts 1240. This layout allows for the rational arrangement of the three-phase static contacts 1220 within a limited space, achieving the functionality of a three-phase circuit. This makes the overall structure more compact, saves space, and facilitates miniaturization and integration of the device. Furthermore, this arrangement facilitates connection of the static contact assembly 120 to external circuits in different directions, providing more flexible connections, reducing line crossings and excessively long routing, and reducing losses and the risk of failure.

[0050] For example, with reference to Figure 1 、 Figure 2 and Figure 3, N is 3, the moving contact assembly 110 may include a mounting base 1140, on which three third connecting posts 1150 may be provided, each of which may be connected to a corresponding moving contact base 1110. Each moving contact base 1110 is connected to the other side of the external circuit via the third connecting posts 1150 (i.e., the static contact base 1210 is connected to one side of the external circuit, and the moving contact base 1110 is connected to the other side of the external circuit). The three moving contact bases 1110 may extend obliquely relative to the mounting base 1140, and the extension directions may be parallel to each other. The extension direction of the three sliding cavities is the same as the extension direction of their corresponding moving contact bases 1110. In this way, the moving contact 1120 moves at an angle rather than vertically, which can achieve a larger stroke in a smaller space, increase the opening and closing speed between the moving contact 1120 and the static contact seat 1210, and enhance the arc extinguishing ability. It is also beneficial to optimize the electric field distribution, reduce the arc erosion of the static contact 1220 and the moving contact 1120, and improve the service life and reliability of electrical equipment. The structural design is more compact and easy to install and maintain.

[0051] For example, with reference to Figure 1 、 Figure 2 and Figure 3 , N is 3, and the three third connecting pillars 1150 can be bent and arranged in a staggered manner. This arrangement makes the structure more compact, and the layout is reasonable in a limited space, thereby improving space utilization.

[0052] For example, referring to Figure 2 The moving contact assembly 110 also includes a drive assembly, which is connected to the moving contact base 1110 and drives the moving contact base 1110 to rotate. Specifically, when the moving contact assembly 110 is in the isolation position, the drive member drives the moving contact base 1110 to rotate, causing the angle between the moving contact base 1110 and the mounting base 1140 to gradually increase, thereby increasing the distance between the moving contact 1120 and the static contact assembly 120. In this way, the separation between the moving contact 1120 and the static contact 1220 is accelerated, improving the circuit disconnection efficiency and safety. After rotation, the distance between the moving contact assembly 110 and the static contact 1220 is greater, and the insulation effect is better.

[0053] For example, with reference to Figure 1 、 Figure 4 and Figure 5Multiple contact pieces 1212 can be spaced apart along the circumference of the connection cavity 1211. When the moving contact assembly 110 is in the connection position, the contact pieces 1212 make contact and conduct electricity with the outer wall of the moving contact 1120. The contact pieces 1212 ensure a reliable electrical connection. The contact pieces 1212 maintain close contact with the moving contact 1120, forming a low-resistance conductive path for smooth current flow. The arrangement of the contact pieces 1212 increases the contact area between the two, reducing power loss and heat generation. For example, the contact pieces 1212 can be connected to an elastic structure. This further ensures a tight connection between the contact pieces 1212 and the moving contact 1120, cushioning the impact of closing and opening, reducing mechanical wear, and extending contact life. The elastic structure allows the moving contact 1120 to adapt to pressure and temperature fluctuations under various operating conditions, maintaining consistent contact and ensuring contact reliability. Even if the contact wears, it can compensate through elastic deformation, preventing poor contact and malfunctions.

[0054] Upon receiving the opening command, the drive assembly drives the N moving contacts 1120 to move, which includes the following three stages:

[0055] In the first stage, the moving contact assembly 110 and the static contact assembly 120 separate, and a small current arc is generated between the moving contact 1120 and the static contact 1220. Since the conductive portion 1221 protrudes from the static contact seat 1210, the arc root starts at the end of the conductive portion 1221 facing the moving contact 1120.

[0056] In the second stage, as the gap between the moving contact 1120 and the static contact 1220 gradually increases, the arc gradually lengthens, and the arc shape becomes violently unstable. Under the action of electric force, arc drift is likely to occur. Because the arc root is always at the end of the conductive portion 1221 facing the moving contact 1120, and at least part of the conductive portion 1221 is made of nickel-based alloy material, even if arc drift occurs, the arc can be kept in a controllable range. As the gap increases, the impedance characteristics cause the arc current to gradually decrease until it is extinguished, minimizing the ablation of the static contact base 1210.

[0057] The third stage, such as Figure 1 , the moving contact 1120 is completely retracted into the moving contact seat 1110, the sulfur hexafluoride nitrogen fusion medium isolation device 10 completes the opening, and the busbar current transfer process is completed.

[0058] According to another aspect of the present invention, an electrical device is also provided. The electrical device may include an outer shell and any of the aforementioned sulfur hexafluoride-nitrogen fusion medium isolation devices 10. The sulfur hexafluoride-nitrogen fusion medium isolation device 10 may be disposed within the outer shell, which may be filled with a fusion medium comprising sulfur hexafluoride and nitrogen. The outer shell is completely isolated from the outside. Because the sulfur hexafluoride-nitrogen fusion medium isolation device 10 utilizes the technical solutions of any of the aforementioned embodiments, the electrical device exhibits at least the beneficial effects of the technical solutions of the aforementioned embodiments, which will not be further detailed here.

[0059] Exemplarily, the volume of sulfur hexafluoride accounts for 20% to 40% of the volume of the fusion medium. For example, the volume of sulfur hexafluoride accounts for 20%, 30%, or 40% of the volume of the fusion medium, and so on. Preferably, the volume of sulfur hexafluoride accounts for 30% of the volume of the fusion medium. Multiple busbar switching current interruption tests were conducted for different volume ratios of sulfur hexafluoride. Comparative analysis of arcing time during busbar switching current interruption at different volume ratios was collected, and the ablation of the static contact assembly 120 was analyzed. Combined with low-carbon and environmental protection requirements, it was determined that the optimal volume ratio of sulfur hexafluoride to the volume of the fusion medium was 30%.

[0060] Common isolation devices using pure sulfur hexafluoride on the market have a busbar switching current technical parameter of 30V / 1600A, which cannot meet the technical level of field application. The sulfur hexafluoride nitrogen fusion medium isolation device 10 provided in this application has a busbar switching current technical parameter of 120V / 2000A that can be safely opened and closed when the volume of sulfur hexafluoride accounts for 30% of the volume of the fusion medium, which can meet the technical level of field application.

[0061] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front", "back", "up", "down", "left", "right", "horizontal", "vertical", "vertical", "horizontal", "top", "bottom", etc. are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0062] For ease of description, area-relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the regional positional relationship between one or more components or features shown in the figures and other components or features. It should be understood that area-relative terms include not only the orientation of the components as described in the figures, but also different orientations during use or operation. For example, if the components in the drawings are inverted as a whole, the situation where the components are "above other components or features" or "above other components or features" will include the situation where the components are "below other components or structures" or "below other components or structures". Therefore, 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 (for example, rotated 90 degrees or other angles), and this document is intended to include all of these situations.

[0063] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, parts, components and / or combinations thereof.

[0064] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0065] The present invention has been described through the above-described embodiments. However, it should be understood that the above-described embodiments are for illustrative and illustrative purposes only and are not intended to limit the present invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments and that various variations and modifications may be made based on the teachings of the present invention, all of which fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sulfur hexafluoride nitrogen fusion medium isolation device, characterized in that: The invention comprises a moving contact assembly and a static contact assembly, wherein the static contact assembly comprises a static contact base and a static contact, wherein a connecting cavity facing the opening of the moving contact assembly is formed in the static contact base, the static contact is connected to the cavity bottom of the connecting cavity and extends toward the moving contact assembly, the static contact is slidably connected to the static contact base, and when the static contact is in an extended position relative to the static contact base, one end of the static contact close to the moving contact assembly protrudes from the static contact base. The movable contact assembly has a disconnecting position and a connecting position relative to the static contact assembly. When the movable contact assembly is in the disconnecting position, the movable contact assembly and the static contact are separated from each other. When the movable contact assembly is in the connecting position, at least a portion of the structure of the movable contact assembly extends into the connecting cavity and contacts and conducts with the static contact. The bottom of the connecting cavity is provided with a guide hole, and the static contact is slidably connected to the guide hole. The static contact seat is provided with an electromagnetic member, and an elastic member is further connected between the static contact and the static contact seat. When the moving contact assembly is in the isolating position, the electromagnetic component is in a power-off state, and the static contact is retracted into the guide hole at the retraction position under the action of the elastic component. When the moving contact assembly is in the connecting position, the electromagnetic component is in a power-on state, and the static contact is extended out of the guide hole and to the extension position under the action of the electromagnetic component.

2. The sulfur hexafluoride nitrogen fusion medium isolation device according to claim 1, characterized in that: A conducting portion is formed on one end of the static contact close to the moving contact assembly, and at least a portion of the conducting portion is made of a nickel-based alloy material.

3. The sulfur hexafluoride nitrogen fusion medium isolation device according to claim 2, characterized in that: The end of the conducting portion facing the moving contact assembly is in an arc shape.

4. The sulfur hexafluoride nitrogen fusion medium isolation device according to claim 2, characterized in that: The static contact also includes a connecting portion connected between the conducting portion and the bottom of the connecting cavity, and the connecting portion is made of copper material. When the moving contact assembly is in the connecting position, the moving contact assembly is in contact with the conducting portion and the moving contact assembly is in contact with the connecting portion.

5. The sulfur hexafluoride nitrogen fusion medium isolation device according to claim 4, characterized in that: On the outer peripheral surface of the static contact, along the axial direction of the static contact, the length of the conducting portion accounts for 3% to 40% of the length of the static contact.

6. The sulfur hexafluoride nitrogen fusion medium isolation device according to claim 4, characterized in that: The connecting portion is cylindrical, and an installation groove is provided at one end of the connecting portion close to the conducting portion, and a part of the structure of the conducting portion is embedded in the installation groove.

7. The sulfur hexafluoride nitrogen fusion medium isolation device according to any one of claims 1 to 6, characterized in that: The moving contact assembly includes a moving contact base and a moving contact movable relative to the moving contact base, wherein a contact cavity is formed in the moving contact. When the moving contact assembly is in the isolating position, the moving contact and the static contact are separated from each other. When the moving contact assembly is in the connecting position, at least part of the structure of the moving contact extends into the connecting cavity, and the static contact is in contact and conductive with the contact cavity.

8. The sulfur hexafluoride nitrogen fusion medium isolation device according to claim 7, characterized in that: The moving contact assembly also 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, and when the moving contact assembly is in the connecting position, at least part of the structure of the moving contact is located outside the sliding cavity.

9. The sulfur hexafluoride nitrogen fusion medium isolation device according to claim 7, characterized in that: The static contact assembly includes N static contact seats and N static contacts, and the static contacts correspond to the static contact seats one-to-one. The moving contact assembly includes N moving contact seats and N moving contacts, and the moving contacts correspond to the moving contact seats one-to-one, and the moving contacts correspond to the static contacts one-to-one. N is a natural number not less than 1.

10. The sulfur hexafluoride nitrogen fusion medium isolation device according to claim 9, characterized in that: The moving contact assembly also includes a driving assembly. A sliding cavity is formed in each moving contact seat. At least part of the structure of the driving assembly extends into each sliding cavity. The driving assembly is connected to each moving contact and drives N moving contacts to move together.

11. The sulfur hexafluoride nitrogen fusion medium isolation device according to claim 9, characterized in that: N is 3, the static contact assembly includes a first connecting post connected to the static contact seat in a one-to-one correspondence, each first connecting post is provided with a second connecting post at one end away from the static contact seat, the second connecting post is arranged obliquely relative to the corresponding first connecting post, and the end of the second connecting post away from the corresponding first connecting post is used to communicate with an external circuit, The three first connecting pillars are parallel to each other, and the inclination direction of at least one of the three second connecting pillars is different from the inclination directions of the other two second connecting pillars.

12. 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 base, three third connecting columns are provided on the mounting base, each of the third connecting columns is correspondingly connected to the moving contact base, the three moving contact bases are all inclined and extended relative to the mounting base, and the extension directions are parallel to each other, and the extension directions of the three sliding cavities are the same as the extension directions of the corresponding moving contact bases.

13. The sulfur hexafluoride nitrogen fusion medium isolation device according to claim 12, characterized in that: The three third connecting pillars are all bent and arranged in an interlaced manner.

14. The sulfur hexafluoride nitrogen fusion medium isolation device according to claim 7, characterized in that: The moving contact assembly further includes a driving assembly, which is connected to the moving contact base and drives the moving contact base to rotate.

15. The sulfur hexafluoride nitrogen fusion medium isolation device according to claim 7, characterized in that: Along the circumferential direction of the connecting cavity, a plurality of contact pieces spaced apart from each other are provided in the connecting cavity. When the moving contact assembly is in the connecting position, the contact pieces are in contact and conduction with the outer wall of the moving contact.

16. An electrical device, characterized in that: It comprises an outer shell and a sulfur hexafluoride-nitrogen fusion medium partition device as described in any one of claims 1 to 15, wherein the sulfur hexafluoride-nitrogen fusion medium partition device is arranged in the outer shell, and the outer shell is filled with a fusion medium, and the fusion medium includes sulfur hexafluoride and nitrogen.

17. The electrical device according to claim 16, characterized in that The volume of the sulfur hexafluoride accounts for 20% to 40% of the volume of the fusion medium.

Images