A silent photovoltaic DC disconnector

Abstract

The present invention relates to the technical field of disconnect switches, and discloses a silent photovoltaic DC disconnect switch. The present invention includes an operating component and an electrical contact component arranged below the operating component. The electrical contact component includes a housing and a plurality of terminal blocks arranged on both sides of the housing. Static contact pieces arranged in sequence from top to bottom are provided on each of the plurality of terminal blocks. An outer contact piece cylinder that is in electrical contact with the plurality of static contact pieces is rotatably installed in the housing, and an inner contact piece cylinder that is in electrical contact with the outer contact piece cylinder and drives in the reverse direction is arranged inside the outer contact piece cylinder. The inner contact piece cylinder is in transmission connection with the operating component, and the conductive connection of the plurality of terminal blocks on both sides is realized through the outer contact piece cylinder and the inner contact piece cylinder as a medium. Two arc extinguishing chambers are arranged on the inner contact piece cylinder. The present invention can utilize the reverse transmission of the inner contact piece cylinder and the outer contact piece cylinder to increase the initial resistance after the rebound mechanism is released, thereby reducing the rotation speed of the rebound mechanism and reducing the impact when it hits the limiting piece.

Description

Technical Field

[0001] The present invention relates to the technical field of disconnectors, and particularly to a silent photovoltaic DC disconnector. Background Art

[0002] The photovoltaic DC disconnector is mainly used to disconnect the DC current in the photovoltaic system. The DC side current in the photovoltaic system is usually relatively high, and there is no natural zero-crossing point for direct current, resulting in the arc not being easily extinguished. The disconnector can disconnect the high DC voltage or current to ensure safe circuit interruption. The DC disconnector usually adopts the manual disconnection method. Compared with the circuit breaker, the disconnector itself does not provide overcurrent protection and generally needs to be used in cooperation with a fuse or a DC circuit breaker.

[0003] Most disconnectors are composed of a moving contact piece, a static contact piece, an arc extinguishing component, and an operating component for controlling the connection or separation of the moving contact piece and the static contact piece. The operating component is generally provided with a rebound mechanism of an adjustable part that can be manually rotated (generally a torsion spring or some other energy storage and rebound mechanism). Through the energy storage and energy release of the rebound mechanism, the moving contact piece and the static contact piece are quickly separated (in order to ensure quick arc extinguishing, in addition to assisting arc extinguishing through the arc extinguishing component, quickly pulling the moving contact piece and the static contact piece apart and breaking the arc can also achieve the purpose of quick arc extinguishing. Therefore, the energy storage and rebound method of the rebound mechanism is generally used to enable the moving contact piece and the static contact piece to quickly move away after separation).

[0004] However, after the rebound mechanism is released, a limiting part is required to limit its stroke. Therefore, after the disconnector is isolated, the rebound mechanism will collide violently with the limiting part, not only making a sound and generating noise, but also easily causing component fracture or deformation of the rebound mechanism and the limiting part over time, affecting the service life of the disconnector. Therefore, it is necessary to propose a silent photovoltaic DC disconnector. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a silent photovoltaic DC disconnector.

[0006] The present invention is implemented by the following technical solutions: an operating component and an electrical contact component arranged below the operating component;

[0007] The operating component includes a top shell and a rebound mechanism, a card slot, and a limiting block arranged in the top cover. The rebound mechanism includes a torsion wheel rotatably installed on the top shell. A hexagonal groove is arranged at the bottom of the torsion wheel. A torsion spring that abuts against the top cover of the shell is arranged at the bottom of the torsion wheel. A retractable clamping rod and a trigger rod connected to the clamping rod are arranged in the torsion wheel. One end of the clamping rod extends into the card slot and abuts against it. A spring that abuts against the clamping rod is also arranged in the torsion wheel.

[0008] The electrical contact component includes a housing and a plurality of terminal blocks arranged on both sides of the housing. Static contact pieces are arranged in sequence from top to bottom on each of the plurality of terminal blocks. An outer contact piece cylinder that is in electrical contact with the plurality of static contact pieces is rotatably installed inside the housing, and an inner contact piece cylinder that is in electrical contact with the outer contact piece cylinder and drives in reverse is located inside the outer contact piece cylinder. A hexagonal rod extending into a hexagonal groove is provided at the top of the inner contact piece cylinder. The inner contact piece cylinder is in transmission connection with the actuating component, and the conductive connection of the plurality of terminal blocks on both sides is realized through the outer contact piece cylinder and the inner contact piece cylinder as a medium. Two arc extinguishing chambers are provided on the inner contact piece cylinder;

[0009] When the actuating component drives the inner contact piece cylinder to rotate, by means of the outer contact piece cylinder, the initial resistance during the rotation of the inner contact piece cylinder is increased, the collision impact between the spring-back mechanism and the limiting member in the actuating component is weakened. At the same time, the reverse rotation of the two also enables the arc generated when the outer contact piece cylinder and the inner contact piece cylinder are separated to be quickly broken.

[0010] As a further improvement of the above solution, two inner toothed rings are fixedly arranged on the inner wall of the outer contact piece cylinder from top to bottom, two outer toothed rings are fixedly arranged outside the inner contact piece cylinder from top to bottom, and two driving gears are rotatably installed inside the housing. The two inner toothed rings and the two outer toothed rings are engaged with the two driving gears.

[0011] As a further improvement of the above solution, the outer contact piece cylinder is composed of an insulating cylinder and a plurality of first moving contact pieces arranged on both sides of the insulating cylinder. One end of each of the plurality of first moving contact pieces extends into the insulating cylinder, and the end of the first moving contact piece outside the insulating cylinder is in electrical contact with the static contact piece.

[0012] As a further improvement of the above solution, the inner contact piece cylinder is composed of an insulating cylinder and a plurality of second moving contact pieces penetrating the insulating cylinder. Both ends of the plurality of second moving contact pieces are in electrical contact with the plurality of first moving contact pieces respectively.

[0013] As a further improvement of the above solution, the static contact piece is in the shape of an arc-shaped long strip, and the end of the first moving contact piece in contact with the static contact piece is a conductive wheel structure, so that when the outer contact piece cylinder drives the first moving contact piece to rotate, it will not be disconnected from the static contact piece, and the arc is generated between the first moving contact piece and the second moving contact piece.

[0014] As a further improvement of the above solution, iron convex pieces are provided on the static contact piece, and two permanent magnets cooperating with the iron convex pieces are also provided on the outer contact piece cylinder. Thus, when the outer contact piece cylinder drives the permanent magnets to rotate and approach the iron convex pieces, the iron convex pieces and the static contact piece are pulled by the magnetic suction force, and the static contact piece restricts the outer contact piece cylinder in a pressing manner, so as to avoid the violent collision between the spring-back mechanism and the limiting member in the actuating component.

[0015] As a further improvement of the above solution, an insulating area is provided between the iron convex piece and the static contact piece, and the insulating area corresponds to the position of the permanent magnet, so as to avoid the permanent magnet interfering with the current on the static contact piece.

[0016] As a further improvement of the above solution, multiple notches adapted to the second moving contact are provided on the part of the permanent magnet extending into the outer contact piece cylinder, so that the multiple second moving contacts on the outer contact piece cylinder will not be restricted by the permanent magnet when the outer contact piece cylinder rotates.

[0017] As a further improvement of the above solution, multiple arc-shaped steel blocks are arranged in the arc extinguishing chamber at intervals and affected by the permanent magnet, so that after the permanent magnet approaches the arc extinguishing chamber on the inner contact piece cylinder driven by the outer contact piece cylinder, the magnetic suction force is used to reduce the rotation speed of the operating component.

[0018] As a further improvement of the above solution, the multiple arc-shaped steel blocks are longitudinally misaligned with the multiple first moving contacts and the multiple second moving contacts respectively, so that they will not affect the arc extinguishing chamber.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] By improving the electrical contact component of the disconnector, the original electrical contact component composed of a static contact piece and a moving contact piece is improved into a new type of electrical contact component composed of a static contact piece, an outer contact piece cylinder, an inner contact piece cylinder and other structures. Compared with the existing electrical contact component of the disconnector, the reverse transmission of the inner contact piece cylinder and the outer contact piece cylinder can be used to increase the initial (front-end stroke) resistance after the rebound mechanism is released, so as to reduce the rotation speed of the rebound mechanism and reduce the impact when it hits the limiting piece. And although the initial separation speed between the first moving contact and the second moving contact is reduced, the reverse separation method between the two also enables the distance between the two to be quickly widened, so that the arc generated during separation can be quickly broken. And the first moving contact and the second moving contact that generate arcs during separation will rotate and move during separation, which can force convective heat dissipation, and also enables the two to fully contact with air during movement to achieve a better cooling effect;

[0021] By setting the static contact piece as an arc-shaped long strip and providing an iron convex piece at its end, and at the same time providing a permanent magnet on the outer contact piece cylinder that can cooperate with the iron convex piece, when the outer contact piece cylinder rotates, after the first moving contact and the second moving contact are completely separated and the arc extinguishing is completed, the permanent magnet can be used to pull the static contact piece, forcing the static contact piece to tightly limit the conductive wheel structure on the first moving contact, so as to brake the entire rebound mechanism when the latch is about to approach the limit block, avoiding violent collision between the latch and the limit block. And when the permanent magnet approaches the iron convex piece, the first moving contact and the second moving contact have completed the separation and arc extinguishing work. Therefore, this speed reduction mechanism only targets the second half of the stroke of the rebound mechanism. Therefore, while achieving braking and speed reduction, it will not affect the normal separation of the first moving contact and the second moving contact;

[0022] By arranging an arc-shaped steel block that can be affected by a permanent magnet in the arc extinguishing chamber, the permanent magnet can not only cooperate with the static contact piece to reduce the speed of the rebound mechanism, but also cooperate with the arc extinguishing chamber to further limit the speed of the latter half of the rebound mechanism and the impact generated after contacting the limit block. Description of the Drawings

[0023] Figure 1 This is an overall display diagram of the silent photovoltaic DC disconnector of the present invention;

[0024] Figure 2 This is a disassembled display diagram of the operating component and the electrical contact component in the silent photovoltaic DC disconnector of the present invention;

[0025] Figure 3 This is a front view sectional housing display diagram of the silent photovoltaic DC disconnector of the present invention;

[0026] Figure 4 This is a sectional display diagram of the silent photovoltaic DC disconnector of the present invention;

[0027] Figure 5 This is a top view sectional housing display diagram of the silent photovoltaic DC disconnector of the present invention;

[0028] Figure 6 This is a top view plane sectional view and a rebound demonstration diagram of the silent photovoltaic DC disconnector of the present invention;

[0029] Figure 7 This is a disassembled display diagram of the housing, the terminal and the static contact piece;

[0030] Figure 8 This is a housing-removed display diagram of the operating component and the electrical contact component;

[0031] Figure 9 This is a disassembled display diagram of the operating component and the electrical contact component;

[0032] Figure 10 This is a bottom view perspective display diagram and a bottom view plane display diagram of the operating component;

[0033] Figure 11 This is a separate display diagram of the static contact piece.

[0034] Main Symbol Explanation:

[0035] 1. Top shell; 111. Limit block; 2. Torsion wheel; 3. Torsion spring; 4. Clamping rod; 5. Spring; 6. Card slot; 7. Trigger rod; 8. Housing; 9. Terminal; 10. Static contact piece; 101. Iron lug; 102. Insulating area; 11. Outer contact piece cylinder; 12. First moving contact piece; 121. Conductive wheel structure; 13. Inner contact piece cylinder; 14. Second moving contact piece; 15. Arc extinguishing chamber; 16. Permanent magnet; 161. Notch; 17. Arc-shaped steel block. DETAILED DESCRIPTION

[0036] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0037] Please combine Figures 1 to 11 , a silent photovoltaic DC isolating switch, comprising: an operating component and an electric contact component arranged below the operating component;

[0038] The operating assembly includes a top shell 1 and a rebound mechanism, a card slot 6 and a limit block 111 arranged in the top cover. The rebound mechanism includes a twist wheel 2 rotatably mounted on the top shell 1. The twist wheel 2 consists of an upper and lower part. The upper part is located on the upper part of the top shell 1, and the lower part is located in the top shell 1. The two are fixed by screws and are rotatably mounted on the top shell 1 in a clamping manner. A hexagonal groove is arranged at the bottom of the twist wheel 2. A torsion spring 3 that abuts against the top cover of the shell 8 is arranged at the bottom of the twist wheel 2. A retractable clamping rod 4 and a trigger rod 7 connected to the clamping rod 4 are arranged in the twist wheel 2. One end of the clamping rod 4 extends into the card slot 6 and abuts against it. A spring 5 that abuts against the clamping rod 4 is also arranged in the twist wheel 2. When the operating assembly performs a current isolation operation, it needs to be triggered by the trigger rod 7. Compared with the method of directly switching through the twist wheel 2, it has the function of preventing accidental touch.

[0039] The electric contact assembly includes a shell 8 and a plurality of terminal blocks 9 fixedly mounted on both sides of the shell 8. The shell 8 is composed of a top cover, a shell body and a bottom cover below. The top shell 1 is fixedly connected to the top cover by screws. The plurality of terminal blocks 9 are fixedly connected with static contact pieces 10 arranged in sequence up and down. An outer contact piece cylinder 11 electrically contacting with the plurality of static contact pieces 10 and an inner contact piece cylinder 13 in the outer contact piece cylinder 11 electrically contacting with the outer contact piece cylinder 11 and driving in reverse are rotatably mounted in the shell 8. Two upper and lower inner tooth rings are fixedly arranged on the inner wall of the outer contact piece cylinder 11. Two upper and lower outer tooth rings are fixedly arranged outside the inner contact piece cylinder 13. The shell 8 has an inner wall. Two upper and lower transmission gears are rotatably installed, two inner gear rings and two outer gear rings are meshed with the two transmission gears, annular rotation grooves are provided on the top cover and the bottom cover, the two ends of the outer contact tube 11 and the inner contact tube 13 are respectively in the corresponding annular rotation grooves for stable rotation, the two transmission gears are rotatably installed on the top cover and the bottom cover respectively, the top of the inner contact tube 13 is provided with a hexagonal rod extending into the hexagonal groove, the inner contact tube 13 is transmission-connected with the operating assembly, and the outer contact tube 11 and the inner contact tube 13 are used as a medium to realize the conductive connection of the multiple wiring terminals 9 on both sides, and two arc extinguishing chambers 15 are fixedly connected to the inner contact tube 13;

[0040] When the operating assembly drives the inner contact tube 13 to rotate, the outer contact tube 11 increases the initial resistance of the inner contact tube 13 during rotation, thereby reducing the collision impact between the rebound mechanism and the limiter in the operating assembly. At the same time, the reverse rotation of the two also enables the arc generated when the outer contact tube 11 and the inner contact tube 13 are separated to be quickly broken.

[0041] Through the above technical solution, compared with the existing disconnector electrical contact assembly, the reverse transmission of the inner contact piece cylinder 13 and the outer contact piece cylinder 11 can be utilized to increase the initial (front-end stroke) resistance after the rebound mechanism is released, thereby reducing the rotation speed of the rebound mechanism and minimizing the impact when it hits the limit member. Moreover, although the initial separation speed between the first moving contact piece 12 and the second moving contact piece 14 is reduced, the reverse separation method between the two also enables the distance between them to be quickly widened, allowing the arc generated during separation to be quickly broken.

[0042] The outer contact piece cylinder 11 is composed of an insulating cylinder and a plurality of first moving contact pieces 12 arranged on both sides of the insulating cylinder. One end of each of the plurality of first moving contact pieces 12 extends into the insulating cylinder, and the end of the first moving contact piece 12 outside the insulating cylinder is in electrical contact with the static contact piece 10. The inner contact piece cylinder 13 is composed of an insulating cylinder and a plurality of second moving contact pieces 14 penetrating through the insulating cylinder. Both ends of the plurality of second moving contact pieces 14 are in electrical contact with the plurality of first moving contact pieces 12 respectively.

[0043] Through the above technical solution, when the first moving contact piece 12 and the second moving contact piece 14 that generate an arc during separation are separated, they will both rotate and move, which can force convective heat dissipation and also enables them to come into full contact with air during separation to achieve a better cooling effect.

[0044] The static contact piece 10 is in the shape of an arc-shaped long strip, and the end of the first moving contact piece 12 in contact with the static contact piece 10 is a conductive wheel structure 121. In this way, when the outer contact piece cylinder 11 drives the first moving contact piece 12 to rotate, it will not be disconnected from the static contact piece 10, and the arc is generated between the first moving contact piece 12 and the second moving contact piece 14.

[0045] The static contact piece 10 is provided with an iron lug 101, and two permanent magnets 16 that cooperate with the iron lug 101 are also provided on the outer contact piece cylinder 11. In this way, when the outer contact piece cylinder 11 drives the permanent magnet 16 to rotate and approach the iron lug 101, the iron lug 101 and the static contact piece 10 are pulled by magnetic attraction, and the static contact piece 10 restricts the outer contact piece cylinder 11 in a pressing manner, so as to avoid the violent collision between the rebound mechanism and the limiting member in the operating component. An insulating area 102 is provided between the iron lug 101 and the static contact piece 10, and the insulating area 102 corresponds to the position of the permanent magnet 16, so as to avoid the permanent magnet 16 interfering with the current on the static contact piece 10. In the connected state, the two permanent magnets 16 are relatively disposed at a 90-degree angle with respect to the conductive contact points (the docking points of the first moving contact piece 12, the second moving contact piece 14, and the static contact piece 10), so as to be away from the conductive contact area and avoid the magnetic field affecting the current. In the present application, the permanent magnet 16 is a ferrite magnet with less influence on the current, and its volume is 5*2*2 cm. (After calculation, for the ferrite magnet with this volume, the influence distance on the current is 1-3 cm, and in the present application, the designed distances of the first moving contact piece 12, the second moving contact piece 14, and the static contact piece 10 are all greater than 5 cm).

[0046] Through the above technical solution, when the outer contact piece cylinder 11 rotates, after the first moving contact piece 12 and the second moving contact piece 14 are completely separated and the arc extinguishing is completed, the static contact piece 10 can be pulled by the permanent magnet 16, forcing the static contact piece 10 to press and limit the conductive wheel structure 121 on the first moving contact piece 12. In this way, when the latch 4 is about to approach the limit block 111, the entire rebound mechanism can be braked to avoid the violent collision between the latch 4 and the limit block 111. And when the permanent magnet 16 approaches the iron lug 101, the first moving contact piece 12 and the second moving contact piece 14 have already completed the separation and arc extinguishing work. Therefore, this deceleration mechanism only acts on the latter half of the stroke of the rebound mechanism. Therefore, while achieving braking and deceleration, it will not affect the normal separation of the first moving contact piece 12 and the second moving contact piece 14.

[0047] Multiple notches 161 adapted to the second moving contact piece 14 are provided on the part of the permanent magnet 16 extending into the outer contact piece cylinder 11, so that when the outer contact piece cylinder 11 rotates, the multiple second moving contact pieces 14 thereon will not be restricted by the permanent magnet 16.

[0048] A plurality of arc-shaped steel blocks 17 that are spaced apart and affected by the permanent magnet 16 are provided in the arc extinguishing chamber 15. In this way, after the permanent magnet 16 approaches the arc extinguishing chamber 15 on the inner contact piece cylinder 13 driven by the outer contact piece cylinder 11, the magnetic attraction is used to reduce the rotation speed of the operating component. The plurality of arc-shaped steel blocks 17 are longitudinally staggered with respect to the plurality of first moving contact pieces 12, the plurality of second moving contact pieces 14, respectively, so that they will not affect the arc extinguishing chamber 15.

[0049] Through the above technical solution, the permanent magnet 16 can not only cooperate with the static contact piece 10 to slow down the rebound mechanism, but also cooperate with the arc extinguishing chamber 15 to further limit the speed of the second half of the rebound mechanism and the impact generated after contacting the limit block 111.

[0050] The implementation principle of a silent photovoltaic DC disconnector in the embodiment of the present application is as follows:

[0051] The limit block 111 and the card slot 6 form a 90-degree angle. Therefore, the rotation angles of the torsion wheel 2 and the inner contact piece cylinder 13 are 90 degrees. At the same time, the circumference of the internal gear ring on the outer contact piece cylinder 11 is 1.5 times the circumference of the external gear ring on the inner contact piece cylinder 13. When the inner contact piece cylinder 13 rotates 90 degrees clockwise, the outer contact piece cylinder 11 rotates 60 degrees counterclockwise. The angular interval between the permanent magnet 16 and the arc extinguishing chamber 15 that can cooperate with it is about 140 degrees (the two rotate towards each other, one rotates 90 degrees, and the other rotates 60 degrees. Therefore, it is necessary to cooperate in advance to limit the speed using magnetic force), and the angular interval with the iron lug 101 is about 50 degrees (the permanent magnet 16 rotates at most 60 degrees. Therefore, when it rotates to a 50-degree angle, it is necessary to limit the speed of the first moving contact piece 12);

[0052] When it is necessary to close the disconnector, press the trigger rod 7. The trigger rod 7 drives the latch rod 4 to squeeze the spring 5 and withdraw from the card slot 6. Subsequently, after losing the limitation of the card slot 6, the torsion wheel 2 rotates clockwise driven by the torsion spring 3 and drives the inner contact piece cylinder 13 to rotate clockwise (refer to the attached Figure 6 )

[0053] The inner contact piece cylinder 13 will drive the outer contact piece cylinder 11 to rotate synchronously and reversely through two transmission gears, so as to increase the initial resistance of the torsion wheel 2 to rebound and reduce the impact when the latch rod 4 on it collides with the limit block 111. During this process, although the positions of the multiple first moving contact pieces 12 on the outer contact piece cylinder 11 are transferred, they still maintain electrical contact with the static contact piece 10, while the multiple second moving contact pieces 14 on the inner contact piece cylinder 13 are disconnected from the multiple first moving contact pieces 12 on the outer contact piece cylinder 11. Therefore, an arc will be generated between the two. And because the inner contact piece cylinder 13 and the outer contact piece cylinder 11 rotate reversely, although there is an initial resistance between the two, resulting in a not-fast-enough initial separation speed, the first moving contact piece 12 and the second moving contact piece 14 can still quickly widen the distance between the two, thereby reducing the existence time of the arc. When the first moving contact piece 12 is separated from the second moving contact piece 14, it is aligned with the arc extinguishing chamber 15 on the inner contact piece cylinder 13. Thus, the arc can be quickly introduced into the arc extinguishing chamber 15;

[0054] Meanwhile, when the outer contact piece cylinder 11 drives the permanent magnet 16 to move to the iron lug 101, the permanent magnet 16 will pull the static contact piece 10 through the iron lug 101. At this time, the first moving contact piece 12 also follows the outer contact piece cylinder 11 to move to a position close to the insulation area 102 (the clamping rod 4 also moves close to the position of the limit block 111, and the permanent magnet 16 is also opposite to the arc extinguishing chamber 15). At this time, the static contact piece 10 will become a stop member to tightly press the conductive wheel structure 121 of the first moving contact piece 12, so as to further limit before the clamping rod 4 hits the limit block 111 and reduce the impact when the two collide;

[0055] Moreover, when the permanent magnet 16 is opposite to the arc extinguishing chamber 15, the arc-shaped steel block 17 on the arc extinguishing chamber 15 is affected by the permanent magnet 16, which will cause the reverse rotation between the outer contact piece cylinder 11 and the inner contact piece cylinder 13 to be affected, thereby further reducing the rotation speed of the torsion wheel 2 and reducing the impact when the clamping rod 4 hits the limit block 111, so as to achieve the purpose of buffering.

[0056] The above embodiments are only the preferred embodiments of the present invention, and the scope of protection of the present invention cannot be limited thereby. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present invention belong to the scope of protection required by the present invention.

Claims

1. A silent photovoltaic DC disconnector, comprising an operating component and an electrical contact component arranged below the operating component, characterized in that: The electrical contact component includes a housing (8) and a plurality of terminal blocks (9) arranged on both sides of the housing (8). Static contact pieces (10) arranged one above the other are provided on each of the plurality of terminal blocks (9). An outer contact piece cylinder (11) that is in electrical contact with the plurality of static contact pieces (10) is rotatably installed in the housing (8), and an inner contact piece cylinder (13) that is in electrical contact with the outer contact piece cylinder (11) and drives in the reverse direction is arranged inside the outer contact piece cylinder (11). The inner contact piece cylinder (13) is in transmission connection with the operating component, and the plurality of terminal blocks (9) on both sides are conductively connected through the outer contact piece cylinder (11) and the inner contact piece cylinder (13) as a medium. Two arc extinguishing chambers (15) are provided on the inner contact piece cylinder (13); A plurality of arc-shaped steel blocks (17) that are spaced apart and affected by a permanent magnet (16) are arranged in the arc extinguishing chamber (15). In this way, after the permanent magnet (16) approaches the arc extinguishing chamber (15) on the inner contact piece cylinder (13) driven by the outer contact piece cylinder (11), the magnetic suction force is used to reduce the rotation speed of the operating component. The plurality of arc-shaped steel blocks (17) are longitudinally misaligned with a plurality of first moving contact pieces (12) and a plurality of second moving contact pieces (14) respectively, so that they will not affect the arc extinguishing chamber (15); Iron tabs (101) are provided on the static contact piece (10), and two permanent magnets (16) that cooperate with the iron tabs (101) are further provided on the outer contact piece cylinder (11). In this way, when the outer contact piece cylinder (11) drives the permanent magnet (16) to rotate and approach the iron tab (101), the iron tab (101) and the static contact piece (10) are pulled by the magnetic suction force, and the static contact piece (10) restricts the outer contact piece cylinder (11) in a pressing manner, so as to avoid violent collision between the spring-back mechanism and the limiting member in the operating component; When the operating component drives the inner contact piece cylinder (13) to rotate, the outer contact piece cylinder (11) is used to increase the initial resistance when the inner contact piece cylinder (13) rotates, weaken the collision impact between the spring-back mechanism and the limiting member in the operating component. At the same time, the reverse rotation of the two also enables the arc generated when the outer contact piece cylinder (11) and the inner contact piece cylinder (13) are separated to be quickly broken.

2. The silent photovoltaic DC disconnector according to claim 1, characterized in that, Two inner toothed rings are fixedly arranged on the inner wall of the outer contact piece cylinder (11) up and down, two outer toothed rings are fixedly arranged outside the inner contact piece cylinder (13), and two transmission gears are rotatably installed in the housing (8). The two inner toothed rings, the two outer toothed rings and the two transmission gears are meshed.

3. The silent photovoltaic DC disconnector according to claim 1, characterized in that, The outer contact piece cylinder (11) is composed of an insulating cylinder and a plurality of first moving contact pieces (12) arranged on both sides of the insulating cylinder. One end of each of the plurality of first moving contact pieces (12) extends into the insulating cylinder, and the end of the first moving contact piece (12) outside the insulating cylinder is in electrical contact with the static contact piece (10).

4. The silent photovoltaic DC disconnector according to claim 3, wherein The inner contact piece cylinder (13) is composed of an insulating cylinder and a plurality of second moving contact pieces (14) penetrating the insulating cylinder. The two ends of each of the plurality of second moving contact pieces (14) are in electrical contact with a plurality of first moving contact pieces (12).

5. The silent photovoltaic DC disconnector according to claim 4, wherein The static contact piece (10) is in an arc-shaped long strip shape, and one end of the first moving contact piece (12) in contact with the static contact piece (10) is a conductive wheel structure (121), so that when the outer contact piece cylinder (11) drives the first moving contact piece (12) to rotate, it will not be disconnected from the static contact piece (10), and an arc is generated between the first moving contact piece (12) and the second moving contact piece (14).

6. The silent photovoltaic DC disconnector according to claim 1, characterized in that, An insulating area (102) is provided between the iron lug (101) and the static contact piece (10), and the insulating area (102) corresponds to the position of the permanent magnet (16), so as to prevent the permanent magnet (16) from interfering with the current on the static contact piece (10).

7. The silent photovoltaic DC disconnector according to claim 1, characterized in that, A plurality of notches (161) adapted to the second moving contact pieces (14) are provided on the part of the permanent magnet (16) extending into the outer contact piece cylinder (11), so that when the outer contact piece cylinder (11) rotates, the plurality of second moving contact pieces (14) thereon are not restricted by the permanent magnet (16).

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