A power engineering isolating switch device

Abstract

The application provides a power engineering isolating switch device, and relates to the field of isolating switches, which comprises a base, a static contact, a movable contact, an insulator and an operating mechanism, the movable contact is rotatably arranged on the base, and further comprises a magnetic control arc extinguishing mechanism, the magnetic control arc extinguishing mechanism comprises a permanent magnet group arranged around a contact area, an arc leading piece linked with the movable contact and an elastic driving piece for promoting the movement of the arc leading piece when the isolating switch is opened, the permanent magnet group is used for driving the movement of an electric arc when the contact is broken, and the arc leading piece is used for guiding and stretching the electric arc to an arc extinguishing area; a contact assembly is arranged on the movable contact, and the contact assembly comprises a floating head arranged in a floating mode, an elastic unit for providing contact pressure for the floating head and a limiting structure for limiting the floating stroke of the floating head. The application guides the extinguishing of the electric arc through the magnetic control arc extinguishing mechanism, the contact assembly ensures stable and reliable contact, and the magnetic field design and the positioning mechanism are matched, so that the opening safety, the closing reliability and the overall service life of the isolating switch are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of disconnecting switches, and more particularly to a disconnecting switch device for power engineering. Background Technology

[0002] Disconnecting switches in power engineering are critical equipment used in power systems to isolate circuits and ensure operational safety. Their operational reliability directly affects the stable operation of the power grid and equipment protection. During the opening and closing process, disconnecting switches must effectively control the electric arc and ensure reliable contact of the contacts to cope with the challenges brought by load current, voltage stress, and frequent operation.

[0003] Traditional disconnecting switches still have room for improvement in arc extinguishing and contact aspects. Their arc extinguishing mechanisms often rely on natural cooling of the arc-extinguishing chamber or simple magnetic blowout methods, resulting in insufficient control over the arc's movement speed and direction, potentially leading to prolonged arc extinguishing time or contact erosion. The contact structure often uses a fixed connection, making it difficult to adaptively compensate for contact surface wear or assembly deviations, which can affect the uniformity of contact pressure over long-term use. Furthermore, the coordinated design of the operating mechanism with the arc extinguishing and contact components may not be fully optimized, resulting in lower efficiency in arc control and contact protection during opening and closing. Specifically, common magnetic blowout disconnecting switches often simply arrange permanent magnets on both sides of the contacts, resulting in a relatively dispersed magnetic field and inaccurate control over the arc's driving direction and speed, potentially causing arc retention and exacerbating contact erosion. Simultaneously, their contacts are mostly rigidly connected, unable to adaptively compensate for contact surface deviations caused by long-term electrical wear, mechanical vibration, or thermal deformation of the mounting base, easily leading to uneven contact pressure and increased contact resistance, affecting long-term operational reliability and current-carrying capacity. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a power engineering disconnecting switch device to address the above-mentioned defects in the prior art.

[0005] In order to overcome the above-mentioned defects of the prior art, embodiments of the present invention provide a power engineering disconnecting switch device to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A power engineering disconnecting switch device includes: a base and a stationary contact, a moving contact, an insulator, and an operating mechanism disposed on the base, wherein the moving contact is rotatably disposed on the base, characterized in that it further includes: A magnetically controlled arc extinguishing mechanism includes a permanent magnet assembly disposed in the contact area, an arc-initiating component linked to the moving contact, and an elastic driving component that causes the arc-initiating component to move when the circuit is opened. The permanent magnet assembly is used to drive the arc to move when the contacts are broken, and the arc-initiating component is used to guide and stretch the arc to the arc extinguishing area. A contact assembly is disposed on the moving contact, the contact assembly including a floating head, an elastic unit that provides contact pressure to the floating head, and a limiting structure that restricts the floating stroke of the floating head.

[0007] Preferably, the permanent magnet assembly includes a first permanent magnet, a second permanent magnet, and a magnetically conductive yoke, wherein the first permanent magnet and the second permanent magnet are connected by the magnetically conductive yoke to form a closed magnetic circuit.

[0008] Preferably, the magnetic yoke is provided with a first mounting groove, a second mounting groove, and a magnetically focused protrusion on the side of the magnetic yoke facing the contact area. The first mounting groove and the second mounting groove are respectively used to accommodate the first permanent magnet and the second permanent magnet.

[0009] Preferably, the permanent magnet assembly further includes a first pressure plate, a second pressure plate, and fastening screws. The first pressure plate fixes the first permanent magnet in the first mounting groove by means of the fastening screws, and the second pressure plate fixes the second permanent magnet in the second mounting groove by means of the fastening screws.

[0010] Preferably, the limiting structure includes a stroke baffle connected to the moving contact and a limiting member connected to the moving contact, wherein the stroke baffle and the limiting member cooperate to limit the floating stroke of the floating head.

[0011] Preferably, the travel baffle has a limiting groove and a fixing hole, the limiting member can slide in the limiting groove, and the fixing hole is used to fix the travel baffle.

[0012] Preferably, the limiting component includes a screw and a locking nut, wherein the locking nut is threaded onto the screw.

[0013] Preferably, the operating mechanism includes an operating handle, a transmission plate, and a positioning component. The transmission plate is disposed between the operating handle and the moving contact, and the positioning component is disposed on the base.

[0014] Preferably, the positioning component includes a positioning pin and a positioning hole, the positioning hole being disposed on the transmission plate, and the positioning pin being able to be inserted into the positioning hole to form a plug-in fit.

[0015] Preferably, it further includes a protective cover and an observation window, the protective cover covering the contact area and the observation window disposed on the protective cover.

[0016] The present invention adopts the above technical solution and has the following technical effects compared with the prior art: 1. High-efficiency arc extinguishing: The magnetically controlled arc extinguishing mechanism uses a stable magnetic field to quickly drive the arc away from the contact and into the arc extinguishing zone, significantly reducing the arc dwell time and contact erosion, and improving the safety of circuit breaking and the life of the equipment.

[0017] 2. Reliable contact: The contact assembly automatically compensates for contact surface deviation and wear through a floating structure and elastic pressure, ensuring uniform contact pressure and stable resistance when closing, and reliable long-term operation.

[0018] 3. Stable magnetic field: The closed magnetic circuit design and magnetic focusing structure concentrate the magnetic field and keep its direction constant. The permanent magnet is firmly installed, the magnetic circuit performance is stable, and it is easy to maintain.

[0019] 4. Precise operation: The operating mechanism has reliable transmission, and the positioning component can accurately lock the opening and closing positions; the observation window provides status visibility, which is convenient for monitoring and interlocking.

[0020] 5. Good coordination: The actions of each mechanism are coordinated and matched during the opening and closing process. The overall structure improves the arc extinguishing and contact performance while taking into account the convenience of operation and safety, resulting in high overall reliability.

[0021] In summary, in this invention, the arc-initiating element intervenes immediately when the arc is generated, actively guiding and carrying the arc, thus minimizing the arc's dwell time on the main surface of the contact. Compared to the traditional passive magnetic blowout arc extinguishing, the active, synchronous arc-initiating structure of this application achieves instantaneous capture and efficient guidance of the arc. Combined with the magnetic field of the permanent magnet assembly, it forms a collaborative working chain of circuit breaker triggering, arc-initiating intervention, and magnetic field drive, significantly improving the speed and reliability of arc extinguishing. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the operating mechanism, moving contact, and base of a power engineering disconnecting switch device according to the present invention; Figure 2 This is a schematic diagram of the base, stationary contact, and moving contact of a power engineering disconnecting switch device according to the present invention; Figure 3 This is a schematic diagram of the permanent magnet assembly of a power engineering disconnect switch device according to the present invention; Figure 4 This is a schematic diagram of the moving contact of a power engineering disconnecting switch device according to the present invention; Figure 5 This is a schematic diagram of the moving contact and floating head of a power engineering disconnecting switch device according to the present invention; Figure 6 This is a schematic diagram of the floating head and travel baffle of a power engineering disconnecting switch device according to the present invention; Figure 7 This is a schematic diagram of the moving contact and operating mechanism of a power engineering disconnecting switch device according to the present invention; Figure 8 This is a schematic diagram of the transmission plate and positioning hole of a power engineering disconnecting switch device according to the present invention; Figure 9This is a schematic diagram of a protective cover for a power engineering disconnect switch device according to the present invention.

[0023] The reference numerals in the attached drawings are as follows: 1. Base; 2. Stationary contact; 3. Moving contact; 4. Insulator; 5. Operating mechanism; 501. Operating handle; 502. Transmission plate; 503. Positioning assembly; 5031. Positioning pin; 5032. Positioning hole; 6. Magnetic arc extinguishing mechanism; 601. Permanent magnet assembly; 6011. First permanent magnet; 6012. Second permanent magnet; 6013. Magnetic yoke; 6014. First mounting slot; 6015. Second mounting slot; 60 16. Magnetic boss; 6017. First pressure plate; 6018. Second pressure plate; 6019. Fastening screw; 602. Arc ignition component; 603. Elastic drive component; 7. Contact assembly; 701. Floating head; 702. Elastic unit; 703. Limiting structure; 7031. Stroke baffle; 7032. Limiting component; 7033. Limiting groove; 7034. Fixing hole; 7035. Screw; 7036. Locking nut; 8. Protective cover; 801. Observation window. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1

[0027] As attached Figures 1 to 9The diagram illustrates a power engineering disconnecting switchgear. A base 1 is a rigid frame structure, providing the installation foundation and mechanical support for the entire disconnecting switchgear. Insulators 4 are fixedly installed on the upper surface of the base 1 to electrically isolate live parts from the base 1. A stationary contact 2 is fixedly installed on the top of the insulator 4, forming a stationary contact end through which current flows. A moving contact 3 is rotatably mounted on the base 1 via a rotating shaft, its rotation plane corresponding to the installation position of the stationary contact 2, allowing the moving contact 3 to contact the stationary contact 2 in the closed position and separate from it in the open position. An operating mechanism 5 is installed on the side of the base 1, with its operating handle 501 located outside the device. A transmission plate 502 is rotatably mounted on the base 1 via its own vertical rotating shaft and connected to the rotating shaft of the operating handle 501 via a linkage mechanism. The upper end of the transmission plate 502 is hinged to the root of the moving contact 3 via a horizontally arranged linkage rod. The positioning component 503 is installed near the movement trajectory of the transmission plate 502. When the operator moves the operating handle 501, the operating handle 501 drives the transmission plate 502 to rotate around its own vertical axis through the linkage mechanism. The transmission plate 502 then drives the moving contact 3 to rotate around its own axis through the horizontal linkage, realizing the opening or closing operation. When the moving contact 3 rotates to the end position of opening or closing, the positioning pin 5031 of the positioning component 503 is inserted into the corresponding positioning hole 5032 on the transmission plate 502 under the action of the spring force, locking the transmission plate 502 and the moving contact 3 in the predetermined position to prevent them from malfunctioning due to vibration or external force.

[0028] The magnetically controlled arc extinguishing mechanism 6 is positioned above the contact area between the stationary contact 2 and the moving contact 3. The permanent magnet assembly 601 is fixed to the base 1 or the insulator 4 by its magnetically conductive yoke 6013. The U-shaped magnetically conductive yoke 6013 spans across the contact area in a front-to-back direction. The first permanent magnet 6011 and the second permanent magnet 6012 are embedded in the first mounting groove 6014 and the second mounting groove 6015 on the front and rear sides of the magnetically conductive yoke 6013, respectively, with opposite polarities, and are pressed and fixed by the first pressure plate 6017, the second pressure plate 6018, and the fastening screw 6019. The magnetically concentrating boss 6016 at the middle of the lower edge of the magnetically conductive yoke 6013 is used to concentrate the magnetic lines of force, and its position is directly opposite the contact breaking gap. The arc-initiating element 602 is made of arc-resistant material and is connected to the inner side of the contact finger on the moving contact 3 via a horizontal hinge shaft, that is, to the inner wall of the jaws of the moving contact 3. The elastic drive element 603 is a torsion spring, fitted onto the hinge shaft. During the closing process, when the stationary contact 2 enters the jaws of the moving contact 3, its surface presses against the working end of the arc-initiating element 602, forcing the arc-initiating element 602 to rotate around the hinge shaft towards the inner side of the jaws, thereby causing the torsion spring 603 to torsionally store energy, and the arc-initiating element 602 is housed inside the upper contact finger. When the moving contact 3 begins to open and rotates, separating from the stationary contact 2 to generate an arc, the positioning constraint of the moving contact 3 is released, the torsion spring 603 is quickly released, driving the arc-initiating element 602 to spring open towards the contact gap. The head of the arc-initiating element 602 has a beveled, curved, sharp, or hook-shaped structure and is made of an arc-resistant copper-tungsten alloy. After it bounces off, it quickly cuts into the root of the initial electric arc, using its good conductivity and heat capacity to 'attract' the electric arc and attach it to its surface. At this time, under the action of the transverse magnetic field generated by the permanent magnet assembly 601, the electric arc is subjected to a Lorentz force perpendicular to the magnetic field and the direction of the electric arc, and is driven to move rapidly upward along the surface of the arc-initiating member 602, entering the strong magnetic field region below the magnetic dome 6016 and being further elongated and cooled until it is extinguished.

[0029] The contact assembly 7 is installed entirely inside the end of the lower contact finger of the moving contact 3; the floating head 701 is set inside the moving contact 3 through a vertical sliding pair, and can adaptively float vertically within a certain range; the elastic unit 702 is set as a helical spring, installed below the floating head 701 and between it and the body of the moving contact 3, providing the floating head 701 with a constant upward contact pressure; the stroke baffle 7031 of the limiting structure 703 is fixed to the side of the floating head 701 through the fixing hole 7034, and the screw 7035 of the limiting member 7032 is fixed to the body of the moving contact 3, and the locking nut 7036 is screwed onto the screw 7035; when the moving contact 3 rotates to the position of the stationary contact... When the two contacts, the floating head 701 is first pressed and fitted against the stationary contact 2 by the push of the elastic unit 702. If there is an assembly deviation or thermal expansion and contraction, the floating head 701 will compress the elastic unit 702 and generate a floating displacement, which at the same time drives the stroke baffle 7031 to move, so that the limiting groove 7033 on the stroke baffle 7031 slides relative to the screw 7035. The floating stroke limit of the floating head 701 is determined by the contact between the end of the limiting groove 7033 and the screw 7035 or the locking nut 7036. This design ensures that the floating head 701 and the stationary contact 2 can maintain reliable contact under various working conditions, while avoiding the elastic unit 702 from being over-compressed and damaged.

[0030] The protective cover 8 is made of high-strength insulating material, and its bottom is fixed to the edge of the base 1 by bolts, forming a protective space that completely encloses the stationary contact 2, the moving contact 3, and the magnetic arc extinguishing mechanism 6. The observation window 801 is made of transparent and impact-resistant polycarbonate material and is installed on the front wall of the protective cover 8 in an embedded or cover-type manner, with its edge sealingly fitting the opening of the protective cover 8. The protective cover 8 can effectively prevent external foreign objects, dust, or moisture from entering the contact area, and at the same time prevent personnel from accidentally touching live parts. When the device is in operation or under maintenance, the operator does not need to open the protective cover 8, but can directly observe the position and status of the moving contact 3, the contact condition of the contacts, and the process of arc generation and extinguishing through the observation window 801.

[0031] Example 2

[0032] This embodiment is based on Embodiment 1 and serves as another feasible alternative to the present invention, such as... Figures 1 to 9 As shown below, see details: Furthermore, the magnetic yoke 6013 is configured with a U-shaped structure, with its two open ends used to fix and connect the first permanent magnet 6011 and the second permanent magnet 6012, respectively. The first permanent magnet 6011 and the second permanent magnet 6012 are installed in opposite polarities, thereby generating a transverse magnetic field with a constant direction within the contact area space surrounded by the magnetic yoke 6013. The sidewall of the magnetic yoke 6013 facing this area is constructed as a magnetic pole surface capable of converging magnetic lines of force. When the moving contact 3 separates from the stationary contact 2 and generates an arc, this transverse... The magnetic field acts on the arc column. According to Fleming's left-hand law, the magnetic field generates a Lorentz force on the charged particles in the arc, perpendicular to both the current direction and the magnetic field direction. This force drives the entire arc to move rapidly along the magnetic pole surface of the magnetic yoke 6013 towards the preset arc-extinguishing area. The closed U-shaped path of the magnetic yoke 6013 provides a low magnetic resistance channel for the magnetic lines of force, effectively constraining magnetic field leakage and ensuring that the Lorentz force acts continuously and stably on the arc generated throughout the entire circuit breaker opening process, until the arc is pulled, stretched, and finally extinguished by the arc-initiating component 602.

[0033] Furthermore, the first mounting groove 6014 and the second mounting groove 6015 are respectively formed on both sides of the magnetic yoke 6013 to accurately accommodate and position the first permanent magnet 6011 and the second permanent magnet 6012; a magnetic concentrating boss 6016 is provided on the side of the magnetic yoke 6013 facing the contact area and protrudes into the contact area; when the first permanent magnet 6011 and the second permanent magnet 6012 are respectively placed into the first mounting groove 6014 and the second mounting groove 6015, the magnetic concentrating boss 6016 makes the magnetic flux of the magnetic yoke 6013 in this area more concentrated; when the moving contact 3 and the stationary contact 2 break and generate an arc, the magnetic field strengthened and concentrated by the magnetic concentrating boss 6016 applies a stronger Lorentz force to the arc, thereby driving the arc away from the contact area more quickly and reliably and moving along the surface of the magnetic concentrating boss 6016 towards the arc extinguishing area.

[0034] Furthermore, the first pressure plate 6017 covers the opening of the first mounting groove 6014, and the second pressure plate 6018 covers the opening of the second mounting groove 6015. The fastening screw 6019 passes sequentially through the through holes on the first pressure plate 6017 and the second pressure plate 6018 and is screwed into the threaded hole of the magnetic yoke 6013. When the fastening screw 6019 is tightened, the first pressure plate 6017 moves downward under the pressure of the screw head, pressing and fixing the first permanent magnet 6011 within the first mounting groove 6014. Simultaneously, the second pressure plate 6018 is subjected to pressure from the nut or screw... The head moves downwards, pressing and fixing the second permanent magnet 6012 within the second mounting groove 6015. This fixing process ensures that the first permanent magnet 6011 and the second permanent magnet 6012 are in close contact with the magnetic yoke 6013, forming a stable magnetic circuit. After the first permanent magnet 6011 and the second permanent magnet 6012 are reliably fixed, the magnetic field distribution generated by them together with the magnetic yoke 6013 is more stable. Thus, when the moving contact 3 and the stationary contact 2 break, they can provide a continuous and uniform Lorentz force for the arc, driving it to move towards the arc extinguishing region.

[0035] Furthermore, the stroke baffle 7031 is configured as a plate-like structure and is fixedly connected to the floating head 701, moving synchronously with the floating head 701. The limiting member 7032 is configured as a column-like structure and is fixedly connected to the moving contact 3, with its position corresponding to the moving path of the stroke baffle 7031. When the floating head 701 floats, the stroke baffle 7031 moves linearly relative to the limiting member 7032 until the stroke baffle 7031 contacts and abuts against the limiting member 7032, thereby limiting the floating stroke of the floating head 701 through contact force.

[0036] Furthermore, the stroke baffle 7031 is provided with a limiting groove 7033 and a fixing hole 7034. The limiting groove 7033 is set as an elongated through groove, and its extension direction is consistent with the floating direction of the floating head 701. The fixing hole 7034 is used to fix the stroke baffle 7031 and the floating head 701 through a connector. The limiting member 7032 extends into the limiting groove 7033 and can slide in it. When the floating head 701 floats, it drives the stroke baffle 7031 and the limiting groove 7033 to move synchronously, so that the limiting groove 7033 slides relative to the limiting member 7032 until the inner wall of the end of the limiting groove 7033 contacts and abuts against the limiting member 7032, thereby limiting the floating stroke of the floating head 701 through mechanical interference.

[0037] Furthermore, the limiting component 7032 includes a screw 7035 and a locking nut 7036. One end of the screw 7035 is fixedly connected to the moving contact 3, and the locking nut 7036 is threadedly connected to the shaft of the screw 7035. By tightening the locking nut 7036, it can be moved along the axial direction of the screw 7035 and fixed in a specified position, thereby adjusting the effective limiting length of the limiting component 7032 relative to the stroke baffle 7031. When the floating head 701 floats and drives the stroke baffle 7031 to move, the inner wall of the end of the limiting groove 7033 on the stroke baffle 7031 finally contacts and abuts against the corresponding part of the locking nut 7036 or the screw 7035, thereby achieving stroke limiting.

[0038] Furthermore, the operating handle 501 receives external operating force and generates rotational or linear motion, which is transmitted to the transmission plate 502 connected to it through a linkage mechanism. The transmission plate 502 converts the motion of the operating handle 501 into a motion form suitable for driving the moving contact 3 (such as converting rotation into linear motion or changing the direction and amplitude of motion), and pushes or pulls the moving contact 3 to rotate around its axis, thereby realizing the closing and opening of the disconnecting switch. During this movement, the positioning component 503 set on the base 1 interacts with the transmission plate 502. When the moving contact 3 rotates to the predetermined closing or opening position, the positioning component 503 engages with the corresponding part on the transmission plate 502 to generate positioning force or audible and tactile feedback, thereby locking the position of the transmission plate 502 and the moving contact 3 to prevent accidental displacement due to vibration or external force, and ensuring the stability of the contact state.

[0039] Furthermore, the positioning pin 5031 has an axial movement tendency under spring force or external drive, and the positioning hole 5032 is opened at the position through which the transmission plate 502 passes by a specific movement trajectory; when the operating handle 501 drives the transmission plate 502 to move and drives the moving contact 3 to rotate to the predetermined closing or opening position, the positioning hole 5032 on the transmission plate 502 moves exactly to the position aligned with the axis of the positioning pin 5031; at this time, the positioning pin 5031 is inserted into the positioning hole 5032 under the action of driving force, and the side of the positioning pin 5031... The contact surface of the transmission plate 502 contacts the inner wall of the positioning hole 5032 and forms a tight fit, generating mechanical interference, thereby preventing the transmission plate 502 from continuing to move or from undergoing accidental displacement. This plug-in engagement action transmits the positioning constraint to the moving contact 3 through the transmission plate 502, locking the moving contact 3 in the required working position. When it is necessary to unlock, an initial operating force sufficient to overcome the spring holding force of the positioning pin 5031 is applied by the operating handle 501, causing the positioning pin 5031 to exit from the positioning hole 5032, after which the transmission plate 502 can be driven normally.

[0040] Furthermore, the protective cover 8 is configured as an insulating shell structure and is fixedly installed on the base 1, completely covering the contact area where the stationary contact 2 and the moving contact 3 are located. The observation window 801 is configured as a transparent plate structure and is embedded in the cover wall of the protective cover 8. When the operating mechanism 5 drives the moving contact 3 to perform opening and closing operations, the operator can directly observe the contact and separation status of the moving contact 3 and the stationary contact 2, as well as the working status of the magnetically controlled arc extinguishing mechanism 6, through the observation window 801. The protective cover 8 serves to isolate the external environment and protect personal safety.

[0041] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly, the accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. Finally, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A power engineering disconnecting switch device, comprising: The base (1) and a stationary contact (2), a moving contact (3), an insulator (4), and an operating mechanism (5) disposed on the base (1), wherein the moving contact (3) is rotatably disposed on the base (1), characterized in that it further comprises: The magnetically controlled arc extinguishing mechanism (6) includes a permanent magnet assembly (601) disposed in the contact area, an arc-initiating component (602) linked with the moving contact (3), and an elastic drive component (603) that causes the arc-initiating component (602) to move when the circuit is opened. The permanent magnet assembly (601) is used to drive the arc to move when the contact is broken, and the arc-initiating component (602) is used to guide and stretch the arc to the arc extinguishing area. The contact assembly (7) is disposed on the moving contact (3). The contact assembly (7) includes a floating head (701) that is floatingly disposed, an elastic unit (702) that provides contact pressure to the floating head (701), and a limiting structure (703) that limits the floating stroke of the floating head (701).

2. The power engineering disconnect switch device according to claim 1, characterized in that: The permanent magnet assembly (601) includes a first permanent magnet (6011), a second permanent magnet (6012), and a magnetic yoke (6013). The first permanent magnet (6011) and the second permanent magnet (6012) are connected by the magnetic yoke (6013) to form a closed magnetic circuit.

3. The power engineering disconnect switch device according to claim 2, characterized in that: The magnetic yoke (6013) is provided with a first mounting groove (6014), a second mounting groove (6015) and a magnetic boss (6016) on the side of the magnetic yoke (6013) facing the contact area. The first mounting groove (6014) and the second mounting groove (6015) are respectively used to accommodate the first permanent magnet (6011) and the second permanent magnet (6012).

4. A power engineering disconnecting switch device according to any one of claims 2 to 3, characterized in that: The permanent magnet assembly (601) further includes a first pressure plate (6017), a second pressure plate (6018), and fastening screws (6019). The first pressure plate (6017) fixes the first permanent magnet (6011) in the first mounting groove (6014) by the fastening screws (6019), and the second pressure plate (6018) fixes the second permanent magnet (6012) in the second mounting groove (6015) by the fastening screws (6019).

5. A power engineering disconnecting switch device according to claim 1, characterized in that: The limiting structure (703) includes a stroke baffle (7031) connected to the floating head (701) and a limiting member (7032) connected to the moving contact (3). The stroke baffle (7031) and the limiting member (7032) cooperate with each other to limit the floating stroke of the floating head (701).

6. A power engineering disconnecting switch device according to claim 5, characterized in that: The travel baffle (7031) has a limiting groove (7033) and a fixing hole (7034). The limiting member (7032) can slide in the limiting groove (7033). The fixing hole (7034) is used to fix the travel baffle (7031) to the floating head (701).

7. A power engineering disconnecting switch device according to claim 5, characterized in that: The limiting component (7032) includes a screw (7035) and a locking nut (7036), wherein the locking nut (7036) is threadedly connected to the screw (7035).

8. A power engineering disconnecting switch device according to claim 1, characterized in that: The operating mechanism (5) includes an operating handle (501), a transmission plate (502) and a positioning component (503). The transmission plate (502) is located between the operating handle (501) and the moving contact (3), and the positioning component (503) is located on the base (1).

9. A power engineering disconnecting switch device according to claim 8, characterized in that: The positioning component (503) includes a positioning pin (5031) and a positioning hole (5032). The positioning hole (5032) is disposed on the transmission plate (502). The positioning pin (5031) can be inserted into the positioning hole (5032) to form a plug-in fit.

10. A power engineering disconnecting switch device according to claim 1, characterized in that: It also includes a protective cover (8) and an observation window (801), the protective cover (8) covering the contact area and the observation window (801) disposed on the protective cover (8).

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