A double-break disconnector

Abstract

The application relates to the technical field of disconnectors, in particular to a double-break disconnector, which comprises a switch main body, the switch main body comprises a shell, and a contact mechanism is arranged in the shell; the contact mechanism comprises: a moving contact, one end of the moving contact is provided with an inwardly-extending cavity, and a contact finger for connection is fixedly connected in the cavity; one end of the contact finger is detachably connected with an end head; the outer surface of the connection position of the end head and the contact finger is provided with a groove, and a scraping ring is detachably connected in the groove; and a static contact is formed by stacking two cylinders, a gap is arranged between the moving contact and the contact finger, the gap is matched with the wall thickness of the static contact when the static contact is inserted into the gap, the scraping ring is made of elastic metal material, and in the whole stroke of insertion and extraction of the static contact, the scraping ring can continuously tightly adhere to the inner wall of the static contact by virtue of the excellent elasticity of the scraping ring, the oxide film and impurities generated in the operation of the inner wall of the static contact are scraped, and the inner wall of the static contact can always keep a good conductive contact state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of disconnectors, in particular to a double-break disconnector. BACKGROUND

[0002] The disconnector is a key electrical device for realizing circuit isolation and forming a visible break in the power system, and the reliability of its performance is directly related to the operation safety and maintenance efficiency of the power grid. The traditional double-break disconnector realizes the conduction and isolation of the circuit through the insertion and separation of the moving and static contacts.

[0003] In the actual operation scenario of electrical equipment, the contact, as the core executive component of current on-off, often faces the dual harsh working conditions of large current impact and frequent opening and closing operations. When the equipment is in such working conditions, at the moment of each break and closure, due to the potential difference between the moving and static contacts, an arc will be generated, causing a dense and high-resistivity oxide film to be generated on the surface of the contact.

[0004] This layer of oxide film will greatly damage the good electrical contact state between the contacts, causing the originally low-resistance metal contact interface to change to a high-resistance oxide layer interface, resulting in a sharp rise in contact resistance and an increase in local temperature. This abnormal heating will cause serious power loss, making the contact more prone to deformation and wear during opening and closing operations, further expanding the contact gap and forming a vicious cycle.

[0005] When this cycle develops to a certain extent, it may cause the device to run less efficiently, the local circuit voltage to drop, and the associated load to work abnormally. In severe cases, it may cause the contact metal to melt, the insulating components to carbonize, and even ignite the surrounding combustible materials, ultimately causing high-temperature ablation, short-circuit tripping and other serious faults, which not only causes huge economic losses, but also poses a direct threat to the personal safety of operating personnel.

[0006] Therefore, there is an urgent need for a double-break disconnector to improve the deficiencies of the prior art. SUMMARY

[0007] The purpose of the present application is to provide a double-break disconnector, which uses a scraper ring made of elastic metal material, whose trapezoidal cross-section design is parallel to the inner wall of the static contact. During the entire stroke of the static contact insertion and extraction, the scraper ring can continuously adhere to the inner wall of the static contact by virtue of its excellent elasticity, scraping off the oxide film and impurities generated during operation on the inner wall of the static contact, and ensuring that the inner wall of the static contact always maintains a good conductive contact state, thereby solving the problems raised in the above background art, i.e.

[0008] In the actual operation scene of the electrical equipment, the contact will generate arc at the moment of each breaking and closing due to the potential difference between the moving contact and the static contact, so that a dense and high-resistivity characteristic oxide film is generated on the surface of the contact, and a safety accident may occur during long-term use.

[0009] To achieve the above object, the application provides a double-break isolation switch, comprising a switch main body, the switch main body comprising a shell, the shell being internally provided with a contact mechanism, the contact mechanism comprising:

[0010] a moving contact, one end of the moving contact being provided with an inwardly extending cavity, and a contact finger for connection being fixedly connected inside the cavity;

[0011] One end of the contact finger is detachably connected with an end head;

[0012] The outer surface of the connection between the end head and the contact finger is provided with a groove, and a scraping ring is detachably connected in the groove;

[0013] a static contact, the static contact being formed by stacking two cylinders, and the diameter of the outer cylinder being greater than the diameter of the inner cylinder;

[0014] A gap is provided between the moving contact and the contact finger, and when the static contact is inserted into the gap, the static contact is extruded and fitted to the contact finger by the inner wall of the gap, and the gap is matched with the wall thickness of the static contact.

[0015] In the above technical solution, when the switch needs to be closed and conducted, the moving contact as the current access end moves towards the static contact, so that the static contact is inserted into the cavity extending inwardly at one end of the moving contact. Since the gap is reserved between the moving contact and the contact finger fixedly connected in the cavity, and the size of the gap is matched with the wall thickness of the static contact, the static contact is extruded by the inner wall of the gap during the insertion process, so that the contact finger is tightly fitted to the surface of the static contact, thereby forming a stable electric contact channel and realizing smooth transmission of the current. At the same time, the outer surface of the connection between the contact finger and the detachably connected end head is provided with a groove, and the detachable scraping ring installed in the groove can scrape and clean the oxide film and impurities that may be generated on the surface of the static contact during the reciprocating action of the insertion and extraction of the static contact, thereby further ensuring the reliability of the contact between the contact finger and the static contact and avoiding abnormal heating caused by the increase of the contact resistance; when the switch needs to be broken, the static contact is withdrawn from the cavity of the moving contact, the contact finger returns to the original position, the electric contact channel is disconnected, and the isolation operation of the circuit is completed.

[0016] On this basis, the driving mechanism drives the gear to rotate through the insulating rod; since the moving contact has a rack at one end which is engaged with the gear, the rotating movement of the gear is converted into the linear movement of the moving contact, so that it can smoothly slide laterally along the first contact seat, thereby realizing the plugging with the static contact. In the closing process, the end of the static contact can be accurately inserted into the gap between the moving contact and the contact finger, the gap size is matched with the static contact wall, which ensures the maximization of the contact area and the stability of the contact, thereby completing the reliable connection of the circuit.

[0017] When the switch needs to be closed, the arc-shaped end head first plays a guiding role, assisting the moving contact as the current access end to move accurately towards the static contact. Meanwhile, the outer surface groove of the contact finger and the end head is installed with a scraping ring made of elastic metal material and having a trapezoidal cross section, and the outer surface thereof is parallel to the inner wall of the static contact. In the reciprocating action of the static contact insertion and extraction, the scraping ring closely adheres to the inner wall of the static contact by virtue of elasticity, efficiently scrapes the surface oxide film and impurities, further guarantees the contact reliability, and avoids abnormal heating caused by increased contact resistance.

[0018] In another technical solution, the second contact seat is fixedly connected to the end of the shell, and the static contact is fixedly connected to the second contact seat; and the static contact is provided with a plurality of notches at one end, which can be contracted to reduce the diameter of the static contact at one end under extrusion.

[0019] When the moving contact moves towards and is inserted into the static contact, the end of the moving contact extrudes the end of the static contact provided with a plurality of notches. Under the action of the extrusion force, each divided unit of the end of the static contact elastically deforms to contract in the radial direction, so as to tightly adhere to the moving contact. This elastic contraction design increases the contact pressure between the two, ensures low contact resistance, compensates for the size deviation caused by machining or wear, realizes tighter and more reliable elastic contact, and effectively avoids virtual connection and discharge phenomenon.

[0020] Compared with the prior art, the beneficial effects of the present application are:

[0021] The scraping ring made of elastic metal material has a trapezoidal cross section design which is parallel to the inner wall of the static contact. In the whole stroke of the insertion and extraction of the static contact, the scraping ring can continuously and closely adhere to the inner wall of the static contact by virtue of its excellent elasticity, scrapes the oxide film and impurities generated in the running of the inner wall of the static contact, and ensures that the inner wall of the static contact always maintains a good conductive contact state.

[0022] When the outer wall of the static contact is extruded by the inner wall of the gap during the insertion process, the friction can further clean the oxide layer that may be attached to the outer wall of the static contact and the outer wall of the contact finger, and the oxide layer on the surfaces of the two components is scraped off to avoid the formation of an oxide film barrier at the contact interface.

[0023] The double cleaning synergistic effect enables the dynamic contact and the static contact to clean the oxide layer during each docking, significantly reduces the contact resistance, reduces the power loss and local high temperature caused by excessive resistance, and avoids the deformation and wear of the contact caused by long-term heating, effectively prolongs the service life of the contact, and provides a core guarantee for the stable operation of the disconnector under large current and frequent operation conditions. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the embodiment;

[0025] Figure 2 It is a schematic diagram of the front view of the embodiment;

[0026] Figure 3 It is a schematic diagram of the side view of the embodiment;

[0027] Figure 4 It is a schematic diagram of the local enlarged structure of the embodiment;

[0028] Figure 5 It is a schematic diagram of the static contact of the embodiment;

[0029] Figure 6 It is a schematic diagram of the dynamic contact structure of the embodiment;

[0030] Figure 7 It is a schematic diagram of the scraping ring structure of the embodiment;

[0031] Figure 8 It is a schematic diagram of the closing structure of the embodiment;

[0032] Figure 9 It is a schematic diagram of the connection structure of the end and the dynamic contact of the embodiment.

[0033] The meanings of the various reference numbers in the figure are as follows:

[0034] 100, switch body; 110, housing; 120, driving mechanism; 121, driving box; 122, insulating rod; 123, gear;

[0035] 200, contact mechanism; 210, first contact seat; 220, dynamic contact; 221, contact finger; 230, second contact seat; 231, static contact; 232, ring groove; 233, chip removal groove; 240, scraping ring; 250, end. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0037] For the conventional contact surface, a high-resistivity oxide film is generated due to frequent opening and closing operations and inevitable arc effect. The oxide film greatly increases the contact resistance between the moving contact 220 and the stationary contact 231, causing abnormal heating during power conduction, resulting in unnecessary loss of electric energy, accelerating aging of the contact material, and even triggering a vicious cycle of high-temperature ablation, which seriously threatens the safety of the equipment. Please refer to Figures 1-9 The embodiment provides a double-break isolation switch, which comprises a switch main body 100, and the switch main body 100 comprises a shell 110, and the shell 110 is internally provided with a contact mechanism 200, and the contact mechanism 200 comprises:

[0038] The moving contact 220 is provided with a cavity extending inward at one end, and a contact finger 221 for connection is fixedly connected in the cavity;

[0039] One end of the contact finger 221 is detachably connected with an end head 250;

[0040] The outer surface of the connection position of the end head 250 and the contact finger 221 is provided with a groove, and a scraping ring 240 is detachably connected in the groove;

[0041] The stationary contact 231 is formed by stacking two cylinders, and the diameter of the outer cylinder is greater than that of the inner cylinder;

[0042] A gap is arranged between the moving contact 220 and the contact finger 221, and when the stationary contact 231 is inserted into the gap, the stationary contact 231 is pressed and fitted to the contact finger 221 by the inner wall of the gap, and the gap is matched with the wall thickness of the stationary contact 231.

[0043] In the implementation, when the switch needs to conduct the circuit, the moving contact 220 moves towards the stationary contact 231 along the set trajectory, at this time, the arc-shaped end head 250 connected with the contact finger 221 in the cavity at one end of the moving contact 220 first contacts the stationary contact 231, and the arc structure provides accurate guidance for the movement of the moving contact 220, ensuring that the moving contact 220 is accurately aligned with the stationary contact 231. With the continuous movement of the moving contact 220, the stationary contact 231 designed by stacking two cylinders is gradually inserted into the gap reserved between the moving contact 220 and the contact finger 221, and since the gap is matched with the wall thickness of the stationary contact 231, the stationary contact 231 is pressed by the inner wall of the gap when being inserted, so that the contact finger 221 is tightly fitted to the outer wall of the stationary contact 231, and a stable electric contact channel is initially formed.

[0044] In the process of moving the moving contact 220 to the stationary contact 231 and completing the butt joint, the scraping ring 240 installed in the groove at the connection between the end head 250 and the contact finger 221 closely adheres to the inner wall of the stationary contact 231 by virtue of its elasticity, and in the process of gradually inserting the stationary contact 231 with the moving contact 220, the oxidation film and impurities on the inner wall of the stationary contact 231 are scraped off efficiently; at the same time, when the stationary contact 231 is inserted into the gap, the friction between the outer wall of the stationary contact 231 and the inner wall of the gap further scrapes off the oxidation layer on the outer wall of the stationary contact 231 and the outer wall of the contact finger 221, and completely removes the oxidation impurities affecting the contact. Finally, after the moving contact 220 is moved into position, the contact finger 221 and the stationary contact 231 form a close fit without the interference of the oxidation layer, realizing stable conduction of the circuit, effectively avoiding the problems of increased contact resistance and abnormal heating caused by oxidation film in traditional contacts, and ensuring safe operation of the equipment.

[0045] Referring to Figures 2-3 As shown, the driving box 121 in the driving mechanism 120 drives the rotation of the insulating rod 122, and the insulating rod 122 not only transmits torque but also ensures electrical insulation with the inside of the shell 110 during the process of penetrating the shell 110. Since the gear 123 is fixedly connected to the end of the insulating rod 122, the rotation of the insulating rod 122 directly drives the synchronous rotation of the gear 123 inside the first contact seat 210.

[0046] In addition, the rotational motion of the gear 123 is converted into the linear motion of the moving contact 220 through the rack engaged with the gear 123. Specifically, the moving contact 220 is engaged with the gear 123 through the rack thereon, and under the guidance and constraint of the first contact seat 210, the rotational force of the gear 123 is converted into precise horizontal linear displacement, thereby reliably driving the moving contact 220 to insert or separate from the stationary contact 231, and realizing the on-off operation of the circuit.

[0047] Figures 4-7 In the process of moving the moving contact 220 to the stationary contact 231 and completing the butt joint, the scraping ring 240 installed in the groove at the connection between the end head 250 and the contact finger 221 closely adheres to the inner wall of the stationary contact 231 by virtue of its elasticity, and in the process of gradually inserting the stationary contact 231 with the moving contact 220, the oxidation film and impurities on the inner wall of the stationary contact 231 are scraped off efficiently; at the same time, when the stationary contact 231 is inserted into the gap, the friction between the outer wall of the stationary contact 231 and the inner wall of the gap further scrapes off the oxidation layer on the outer wall of the stationary contact 231 and the outer wall of the contact finger 221, and completely removes the oxidation impurities affecting the contact. Finally, after the moving contact 220 is moved into position, the contact finger 221 and the stationary contact 231 form a close fit without the interference of the oxidation layer, realizing stable conduction of the circuit, effectively avoiding the problems of increased contact resistance and abnormal heating caused by oxidation film in traditional contacts, and ensuring safe operation of the equipment.

[0048] Secondly, as the moving contact 220 continues to move, the static contact 231 gradually inserts into the gap between the moving contact 220 and the contact finger 221, at this time the wiper ring 240 in the groove at the connection between the contact finger 221 and the end head 250 starts to work, the wiper ring 240 is made of elastic metal material, and the cross section is trapezoidal, the outer surface is parallel to the inner wall of the static contact 231, and the wiper ring 240 can tightly fit the inner wall of the static contact 231 by virtue of its elasticity, and can synchronously scrape off the oxide film and impurities generated on the inner wall of the static contact 231 during the insertion of the static contact 231, so as to prevent the oxide layer from affecting the contact effect; when the moving contact 220 moves to the position and the static contact 231 is completely inserted into the gap, the wiper ring 240 will be accurately embedded in the ring groove 232 inside the static contact 231 and matched with the ring groove 232, the ring groove 232 provides a stable placement space for the wiper ring 240, avoiding displacement of the wiper ring 240 during equipment operation, resulting in failure of the cleaning function, and at the same time, the contact finger 221 is tightly fitted with the outer wall of the static contact 231 under the extrusion of the inner wall of the gap, and finally a stable electrical contact without the interference of the oxide layer is formed, realizing reliable conduction of the circuit.

[0049] When the moving contact 220 moves towards and inserts into the static contact 231, the end of the moving contact 220 will extrude the end of the static contact 231 which is provided with a plurality of notches. Under the action of extrusion force, each divided unit of the end of the static contact 231 elastically deforms, so that the caliber of each divided unit contracts radially, so that the caliber of each divided unit tightly fits the moving contact 220. The elastic contraction design increases the contact pressure of the two, ensures low contact resistance, and also compensates for the size deviation caused by processing or wear, realizes tighter and more reliable elastic contact, and effectively avoids virtual connection and discharge phenomenon.

[0050] Referring to Figure 8 When the moving contact 220 moves towards the static contact 231 fixed to the second contact seat 230, the wiper ring 240 in the groove at the connection between the contact finger 221 and the end head 250 tightly fits the inner wall of the static contact 231, and efficiently scrapes off the oxide layer debris generated on the surface of the static contact 231 during the reciprocating action of insertion and extraction of the static contact 231.

[0051] The scraped off oxide layer debris will naturally fall into the ring groove 232 inside the static contact 231 during the insertion and extraction action of the static contact 231, and a plurality of chip removal grooves 233 pre-provided on the ring groove 232 become a channel for the debris to be removed. Since the inner surface of the static contact 231 adopts a downward inclined structure design, the oxide layer debris falling into the ring groove 232 will smoothly slide down to the bottom of the shell 110 along the chip removal groove 233 under the action of gravity, avoiding the problems of poor fit of the wiper ring 240, increase of contact resistance of the contact finger 221 and the like caused by accumulation of the debris in the ring groove 232 or the contact area.

[0052] When maintenance cleaning is needed, the shell 110 is simply opened, and the accumulated oxide layer debris at the bottom of the shell 110 can be directly poured out without disassembling the complex contact mechanism 200, simplifying the maintenance process, ensuring the reliability of the long-term contact between the moving and static contacts 231, and avoiding the risk of abnormal heating caused by residual oxide layer.

[0053] Referring to Figure 9 As shown, the end head 250 is fixed on the moving contact 220 by threaded connection, which is stable and convenient for later disassembly and replacement; at the same time, the outer surface of the connection between the moving contact 220 and the end head 250 is concave downward, and the thread structure is arranged in the concave part, and the scraping ring 240 is tightly installed on the contact finger 221 through the thread connection. When the scraping ring 240 is worn out due to long-term use and the cleaning efficiency is reduced, the old scraping ring 240 can be directly unscrewed and replaced with a new one.

[0054] In the oxide layer discharge link, the oxide layer debris scraped by the scraping ring 240 falls into the internal ring groove 232 of the static contact 231 through the plugging action of the static contact 231, and then slides smoothly to the bottom of the shell 110 under the action of gravity through the chip removal groove 233 on the ring groove 232. In addition, the contact finger 221 and the end head 250 are replaceable parts. When the contact finger 221 is deformed due to long-term extrusion and the end head 250 arc guide structure is worn out and affects the plugging accuracy, they can be replaced separately by disassembling the thread, without replacing the entire contact mechanism 200.

[0055] In use, the drive box 121 drives the insulating rod 122 to rotate, and the insulating rod 122 rotates together with the gear 123 fixed at the end of the shell 110 in the first contact seat 210; the rotating motion of the gear 123 is converted into the linear motion of the moving contact 220 along the transverse direction of the first contact seat 210 through the gear rack of the moving contact 220, so that the moving contact 220 accurately approaches the static contact 231 fixed to the second contact seat 230. During this process, the arc-shaped end head 250 connected to the contact finger 221 in the cavity at one end of the moving contact 220 first contacts the static contact 231, and the arc structure guides the accurate alignment of the moving contact 220 and the static contact 231, avoiding plugging deviation. When the moving contact 220 moves towards the static contact 231 and is inserted, the end of the moving contact 220 will extrude the end of the static contact 231 with multiple notches. Under the action of the extrusion force, each segmented unit at the end of the static contact 231 elastically deforms, so that its caliber shrinks radially, thereby tightly abutting the moving contact 220. This elastic contraction design increases the contact pressure between the two, ensures low contact resistance, compensates for the size deviation caused by processing or wear, realizes tighter and more reliable elastic contact, and effectively avoids virtual connection and discharge phenomenon.

[0056] With the continuous movement of the moving contact 220, the static contact 231 with a double-cylinder stacking design is gradually inserted into the gap between the moving contact 220 and the contact finger 221, and the inner wall of the gap extrudes the static contact 231 to make the contact finger 221 tightly fit the outer wall thereof; at the same time, the scraping ring 240 with an elastic metal material and a trapezoidal cross section in the groove at the connection between the contact finger 221 and the end head 250 is tightly pressed against the inner wall of the static contact 231 under the action of the spring radial thrust, and moves relatively with the insertion of the moving contact 220, efficiently scrapes off the oxide film and impurities on the inner wall of the static contact 231, and the friction between the outer wall of the static contact 231 and the inner wall of the gap also removes the oxide layer on the outer wall of the static contact 231 and the contact finger 221; when the moving contact 220 moves to the position, the scraping ring 240 is precisely embedded in the ring groove 232 inside the static contact 231 to realize positioning, the contact finger 221 and the static contact 231 form stable electrical contact without the interference of the oxide layer, and the circuit conduction is completed.

[0057] In terms of oxide layer treatment and later maintenance, the oxide layer debris scraped off by the scraping ring 240 falls into the ring groove 232 with the plugging action of the static contact 231, passes through the chip removal groove 233 on the ring groove 232, and slides to the bottom of the shell 110 under the action of gravity with the help of the downward inclined structure of the inner surface of the static contact 231; when maintaining, the bottom debris can be poured out by only opening the shell 110, without disassembling the contact mechanism 200. In addition, the end head 250 is connected with the moving contact 220 through threads, the contact finger 221 is connected with the scraping ring 240 through threads in the recess, and the contact finger 221, the end head 250 and the scraping ring 240 are all replaceable parts, when the scraping ring 240 is worn, the contact finger 221 is deformed or the guide structure of the end head 250 is damaged, they can be replaced separately by disassembling the threads, which greatly reduces the maintenance cost and downtime.

[0058] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A double-break disconnector comprising a switch body (100) comprising a housing (110), characterized in that: The shell (110) is internally provided with a contact mechanism (200), the contact mechanism (200) comprises: A movable contact (220) is internally provided with a cavity extending inward, and a contact finger (221) for connection is fixedly connected inside the cavity; One end of the contact finger (221) is detachably connected with an end head (250); The outer surface of the connection between the end head (250) and the contact finger (221) is provided with a groove, and the groove is detachably connected with a scraping ring (240); The static contact (231) is formed by stacking two cylinders, and the diameter of the outer cylinder is larger than that of the inner cylinder; The static contact (231) is internally provided with a ring groove (232) matched with the scraping ring (240), and the ring groove (232) is used for placing the scraping ring (240) after the contact finger (221) is inserted; A plurality of chip removal grooves (233) for removing the oxide layer are arranged on the ring groove (232); The movable contact (220) and the contact finger (221) are provided with a gap, and when the static contact (231) is inserted into the gap, the static contact (231) is pressed and fitted with the contact finger (221) by the inner wall of the gap, and the gap is matched with the wall thickness of the static contact (231).

2. Double-break disconnector according to claim 1, characterized in that The shell (110) is internally provided with a first contact seat (210), and the first contact seat (210) is rotatably connected with a gear (123) inside.

3. Double-break disconnector according to claim 2, characterized in that The shell (110) is provided with a driving mechanism (120), which is used for driving the opening and closing of the movable contact (220) and the static contact (231), and the driving mechanism (120) comprises a driving box (121), which is fixedly connected with the outside of the shell (110), and the side of the driving box (121) close to the shell (110) is fixedly connected with an insulating rod (122) penetrating through the shell (110), and the gear (123) is fixedly connected with the insulating rod (122).

4. Double-break disconnector according to claim 3, characterized in that The movable contact (220) is slidably connected with the first contact seat (210), one end of the movable contact (220) is provided with a rack engaged with the gear (123), and the gear (123) is rotated to drive the movable contact (220) to move transversely along the first contact seat (210).

5. The double-break disconnector according to claim 1, characterized in that: The scraping ring (240) is made of a metal material with elasticity.

6. The double-break disconnector according to claim 1, characterized in that: The cross section of the scraping ring (240) is trapezoidal, and the outer surface of the scraping ring (240) is parallel to the inner wall of the static contact (231).

7. The double-break disconnector according to claim 1, characterized in that: One end of the end head (250) is arc-shaped, and the end head (250) is used for guiding the insertion of the movable contact (220) into the static contact (231).

8. The double-break disconnector according to claim 1, characterized in that: The end of the shell (110) is fixedly connected with a second contact seat (230), and the static contact (231) is fixedly connected with the second contact seat (230).

9. The double-break disconnector according to claim 1, characterized in that: One end of the static contact (231) is provided with a plurality of notches, which can be contracted when pressed to reduce the diameter of one end of the static contact (231).

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