Mute photovoltaic direct-current isolating switch

Abstract

The invention relates to the technical field of isolating switches, and discloses a mute photovoltaic direct-current isolating switch. The circuit breaker comprises an operating assembly and an electric contact assembly arranged below the operating assembly, the electric contact assembly comprises a shell and a plurality of wiring terminals arranged on the two sides of the shell, and the plurality of wiring terminals are all provided with static contact pieces which are sequentially arranged from top to bottom. An outer contact piece cylinder electrically contacted with the static contact pieces and an inner contact piece cylinder which is located in the outer contact piece cylinder, electrically contacted with the outer contact piece cylinder and in reverse transmission are rotatably installed in the shell, the inner contact piece cylinder is in transmission connection with the operating assembly, and the outer contact piece cylinder and the inner contact piece cylinder serve as media to achieve conductive connection of the wiring terminals on the two sides. And two arc extinguish chambers are arranged on the inner contact cylinder. Initial resistance after the rebound mechanism is released can be increased through reverse transmission of the inner contact piece cylinder and the outer contact piece cylinder, so that the rotation speed of the rebound mechanism is reduced, and impact generated when the rebound mechanism collides with a limiting piece is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of isolating switches, and in particular to a silent photovoltaic direct current isolating switch. Background Art

[0002] Photovoltaic DC isolating switches are mainly used to disconnect DC current in photovoltaic systems. The DC side current of photovoltaic systems is usually high, and DC current has no natural zero crossing point, which makes it difficult to extinguish the arc. The isolating switch can disconnect high DC voltage or current to ensure safe circuit disconnection. DC isolating switches usually use manual disconnection. Compared with circuit breakers, isolating switches themselves do not provide overcurrent protection and generally need to be used in conjunction with fuses or DC circuit breakers.

[0003] Most isolating switches are composed of a moving contact, a stationary contact, an arc extinguishing assembly, and an operating assembly for controlling the connection or separation of the moving contact and the stationary contact. The operating assembly is generally provided with a manually rotatable adjustment member rebound mechanism (generally a torsion spring or some other energy storage rebound mechanism), and the moving contact and the stationary contact are quickly separated by the energy storage and release of the rebound mechanism. (In order to ensure rapid arc extinguishing, in addition to the arc extinguishing assistance of the arc extinguishing assembly, the moving contact and the stationary contact can be quickly pulled apart and the arc broken to achieve the purpose of rapid arc extinguishing. Therefore, the rebound mechanism is generally used to store energy and rebound to allow the moving contact and the stationary contact to quickly move away after separation).

[0004] However, after the rebound mechanism is released, a limiter is required to limit its travel. Therefore, after the isolating switch is isolated, the rebound mechanism will collide violently with the limiter, which will not only make a sound and generate noise, but also easily cause the rebound mechanism and the limiter to break or deform over time, affecting the service life of the isolating switch. Therefore, it is necessary to propose a silent photovoltaic DC isolating switch. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a silent photovoltaic DC isolating switch.

[0006] The present invention is implemented by the following technical solutions: an operating component and an electric contact component arranged below the operating component; The operating assembly includes a top shell and a rebound mechanism, a card slot and a limit block arranged in the top cover. The rebound mechanism includes a twist wheel rotatably mounted on the top shell, a hexagonal slot is arranged at the bottom of the twist wheel, a torsion spring abutting against the top cover of the shell is arranged at the bottom of the twist wheel, a retractable card rod and a trigger rod connected to the card rod are arranged in the twist wheel, one end of the card rod extends into the card slot and abuts against it, and a spring abutting against the card rod is also arranged in the twist wheel; 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 and an inner contact piece cylinder that is in electrical contact with the outer contact piece cylinder and drives in reverse are rotatably installed in the housing. A hexagonal rod extending into a hexagonal groove is arranged at the top of the inner contact piece cylinder. The inner contact piece cylinder is in transmission connection with an operating component. The plurality of terminal blocks on both sides are conductively connected 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; When the operating component drives the inner contact piece cylinder to rotate, the outer contact piece cylinder is used to increase the initial resistance during the rotation of the inner contact piece cylinder, weaken the collision impact between the spring-back mechanism and the limiting part 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 and the inner contact piece cylinder are separated to be quickly broken.

[0007] 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, two outer toothed rings are fixedly arranged outside the inner contact piece cylinder, and two transmission gears are rotatably installed in the housing. The two inner toothed rings, the two outer toothed rings and the two transmission gears are meshed with each other.

[0008] 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.

[0009] 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.

[0010] 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. In this way, 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.

[0011] As a further improvement of the above solution, iron protrusions are arranged on the static contact piece, and two permanent magnets cooperating with the iron protrusions are also arranged on the outer contact piece cylinder. In this way, when the outer contact piece cylinder drives the permanent magnets to rotate and approach the iron protrusions, the iron protrusions and the static contact piece are pulled by 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 part in the operating component.

[0012] As a further improvement of the above solution, an insulating area is arranged between the iron protrusion 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.

[0013] 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.

[0014] 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.

[0015] As a further improvement of the above solution, the multiple arc-shaped steel blocks are longitudinally staggered with the multiple first moving contacts and the multiple second moving contacts respectively, so that they will not affect the arc extinguishing chamber.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 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, etc. 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 part. 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 them to be quickly increased, so that the arc generated during separation can be quickly broken. Moreover, 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; 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 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 clamping rod is about to approach the limiting block, avoiding the violent collision between the clamping rod and the limiting 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 realizing the braking and speed reduction, it will not affect the normal separation of the first moving contact and the second moving contact; 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. Brief Description of the Drawings

[0017] Figure 1 This is an overall display diagram of the silent photovoltaic DC disconnector of the present invention; 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; Figure 3 This is a front view cutaway housing display diagram of the silent photovoltaic DC disconnector of the present invention; Figure 4 This is a cutaway display diagram of the silent photovoltaic DC disconnector of the present invention; Figure 5 This is a top view cutaway housing display diagram of the silent photovoltaic DC disconnector of the present invention; Figure 6 This is a top view plane cutaway view and a rebound demonstration diagram of the silent photovoltaic DC disconnector of the present invention; Figure 7 This is a disassembled display diagram of the housing, the terminal block, and the static contact piece; Figure 8 This is a disassembled housing display diagram of the operating component and the electrical contact component; Figure 9 This is a disassembled display diagram of the operating component and the electrical contact component; Figure 10 This is a bottom view perspective display diagram and a bottom view plane display diagram of the operating component; Figure 11 This is a separate display diagram of the static contact piece.

[0018] Main Symbol Explanation: 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 block; 10. Static contact piece; 101. Iron convex piece; 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 Embodiment

[0019] Next, in combination with the drawings and the specific embodiments, the present invention will be further described.

[0020] Please refer to Figures 1 to 11 , the silent photovoltaic DC disconnector includes: an operating component and an electrical contact component arranged below the operating component; 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. 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; 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.

[0021] 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 release of the spring-back mechanism, thereby reducing the rotation speed of the spring-back mechanism and the impact when it hits the limiting piece. 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.

[0022] 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 ends of the plurality of first moving contact pieces 12 all extend into the insulating cylinder. 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 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.

[0023] Through the above technical solution, when the first moving contact piece 12 and the second moving contact piece 14 that generate arcs during separation separate, they will both rotate and move, which can force convective heat dissipation and also enable them to come into full contact with air during separation to achieve a better cooling effect.

[0024] The static contact piece 10 is in the shape of an arc-shaped long strip. 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.

[0025] The static contact piece 10 is provided with iron lugs 101, and two permanent magnets 16 cooperating with the iron lugs 101 are also provided on the outer contact piece cylinder 11. In this way, when the outer contact piece cylinder 11 drives the permanent magnets 16 to rotate and approach the iron lugs 101, the iron lugs 101 and the static contact piece 10 are pulled by magnetic suction force, and the static contact piece 10 restricts the outer contact piece cylinder 11 in a pressing manner to avoid the violent collision between the spring-back mechanism in the operating assembly and the limiting piece. An insulating area 102 is provided between the iron lugs 101 and the static contact piece 10, and the insulating area 102 corresponds to the position of the permanent magnets 16 to avoid the interference of the permanent magnets 16 on the current on the static contact piece 10. In the connected state, the two permanent magnets 16 are relatively 90 degrees 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 far away from the conductive contact area and avoid the influence of the magnetic field on the current. In this application, the permanent magnets 16 adopt ferrite magnets with less influence on the current, and the volume is 5*2*2 cm. (After calculation, for the ferrite magnets with this volume, the influence distance on the current is 1 - 3 cm, and in this 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).

[0026] 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 arc extinguishing is completed, the permanent magnet 16 can pull the static contact piece 10, forcing the static contact piece 10 to tightly limit the conductive wheel structure 121 on the first moving contact piece 12. In this way, when the clamping rod 4 is about to approach the limit block 111, the entire rebound mechanism is braked to avoid violent collision between the clamping rod 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 completed the separation and arc extinguishing work. Therefore, this speed reduction mechanism only targets the latter 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 piece 12 and the second moving contact piece 14.

[0027] A plurality of 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 plurality of second moving contact pieces 14 thereon are not restricted by the permanent magnet 16.

[0028] A plurality of arc-shaped steel blocks 17 which are spaced apart and affected by the 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 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.

[0029] Through the above technical solution, the permanent magnet 16 can not only cooperate with the static contact piece 10 to reduce the speed of the rebound mechanism, but also cooperate with the arc extinguishing chamber 15 to further limit the speed of the latter half of the stroke of the rebound mechanism and the impact generated after contacting the limit block 111.

[0030] The implementation principle of a silent photovoltaic DC disconnector in the embodiment of the present application is as follows: The angle between the limit block 111 and the card slot 6 is 90 degrees. 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 angle 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, so it is necessary to cooperate in advance to use magnetic force for speed reduction), and the angle 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); When the disconnector needs to be closed, press the trigger rod 7. The trigger rod 7 drives the locking 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 appendix Figure 6 ) The inner contact piece cylinder 13 will synchronously drive the outer contact piece cylinder 11 to rotate reversely synchronously through two transmission gears, so as to increase the initial resistance of the torsion wheel 2 to rebound and reduce the impact when the locking rod 4 on it collides with the limiting 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 electric 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 the initial resistance between the two causes the initial separation speed not to be fast enough, the distance between the first moving contact piece 12 and the second moving contact piece 14 can still be quickly increased, so as to reduce the existence time of the electric 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. In this way, the electric arc can be quickly introduced into the arc extinguishing chamber 15; At the same time, when the outer contact piece cylinder 11 drives the permanent magnet 16 to transfer to the iron lug 101, the permanent magnet 16 will pull the static contact piece 10 through the iron lug 101. And at this time, the first moving contact piece 12 also follows the outer contact piece cylinder 11 to transfer to a position close to the insulation area 102 (the locking rod 4 also transfers close to the limiting 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 press against the conductive wheel structure 121 of the first moving contact piece 12, so as to further limit it before the locking rod 4 hits the limiting block 111 and reduce the impact when the two collide; 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 affect the reverse rotation between the outer contact piece cylinder 11 and the inner contact piece cylinder 13, thereby further reducing the rotation speed of the torsion wheel 2 and reducing the impact when the locking rod 4 hits the limiting block 111, so as to achieve the purpose of buffering.

[0031] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention belong to the scope of protection required by the present invention.

Claims

1. A silent photovoltaic DC isolating switch, comprising an operating assembly and an electric contact assembly arranged below the operating assembly, characterized in that: The electric contact assembly comprises a housing (8) and a plurality of wiring terminals (9) arranged on both sides of the housing (8), the plurality of wiring terminals (9) being provided with static contacts (10) arranged in sequence up and down, an outer contact cylinder (11) being rotatably mounted in the housing (8) and being in electrical contact with the plurality of static contacts (10), and an inner contact cylinder (13) being located in the outer contact cylinder (11) and being in electrical contact with the outer contact cylinder (11) and being driven in reverse, the inner contact cylinder (13) being in driving connection with the operating assembly, and realizing conductive connection of the plurality of wiring terminals (9) on both sides by using the outer contact cylinder (11) and the inner contact cylinder (13) as a medium, and two arc extinguishing chambers (15) being provided on the inner contact cylinder (13); When the operating assembly drives the inner contact cylinder (13) to rotate, the outer contact cylinder (11) is used to increase the initial resistance of the inner contact cylinder (13) during rotation, thereby reducing the collision impact between the rebound mechanism in the operating assembly and the limiter. At the same time, the reverse rotation of the two also allows the arc generated when the outer contact cylinder (11) and the inner contact cylinder (13) are separated to be quickly broken.

2. The silent photovoltaic DC isolating switch according to claim 1, characterized in that: Two upper and lower inner toothed rings are fixedly arranged on the inner wall of the outer contact cylinder (11), two upper and lower outer toothed rings are fixedly arranged outside the inner contact cylinder (13), and two upper and lower transmission gears are rotatably mounted inside the outer shell (8), and the two inner toothed rings and the two outer toothed rings are meshed with the two transmission gears.

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

4. The silent photovoltaic DC isolating switch according to claim 3, characterized in that: The inner contact piece cylinder (13) is composed of an insulating cylinder and a plurality of second movable contact pieces (14) penetrating the insulating cylinder, and two ends of the plurality of second movable contact pieces (14) are respectively in electrical contact with the plurality of first movable contact pieces (12).

5. The silent photovoltaic DC isolating switch according to claim 4, characterized in that: The stationary contact piece (10) is in the shape of an arc-shaped long strip, and the end of the first moving contact piece (12) that contacts the stationary contact piece (10) is a conductive wheel structure (121), so that when the outer contact piece tube (11) drives the first moving contact piece (12) to rotate, it will not be disconnected from the stationary contact piece (10), allowing an electric arc to be generated between the first moving contact piece (12) and the second moving contact piece (14).

6. The silent photovoltaic DC isolating switch according to claim 1, characterized in that: The stationary contact piece (10) is provided with an iron protrusion (101), and the outer contact piece tube (11) is also provided with two permanent magnets (16) cooperating with the iron protrusion (101), so that when the outer contact piece tube (11) drives the permanent magnet (16) to rotate and approaches the iron protrusion (101), the iron protrusion (101) and the stationary contact piece (10) are pulled by magnetic attraction, so that the stationary contact piece (10) is restricted to the outer contact piece tube (11) in a tight manner, thereby avoiding a violent collision between the rebound mechanism in the operating component and the limit member.

7. The silent photovoltaic DC isolating switch according to claim 6, characterized in that: An insulating area (102) is provided between the iron protrusion (101) and the stationary contact piece (10), and the insulating area (102) corresponds to the position of the permanent magnet (16), thereby preventing the permanent magnet (16) from interfering with the current on the stationary contact piece (10).

8. The silent photovoltaic DC isolating switch according to claim 6, characterized in that: The portion of the permanent magnet (16) extending into the outer contact sheet barrel (11) is provided with a plurality of notches (161) adapted to the second movable contact sheets (14), so that when the outer contact sheet barrel (11) rotates, the plurality of second movable contact sheets (14) thereon will not be restricted by the permanent magnet (16).

9. The silent photovoltaic DC isolating switch according to claim 1, characterized in that: A plurality of arc-shaped steel blocks (17) are arranged in the arc extinguishing chamber (15) and are distributed at intervals and are influenced by the permanent magnet (16), so that after the permanent magnet (16) is driven by the outer contact blade barrel (11) to approach the arc extinguishing chamber (15) on the inner contact blade barrel (13), the magnetic attraction force is used to reduce the rotation speed of the operating component.

10. The silent photovoltaic DC isolating switch according to claim 1, characterized in that: The plurality of arc-shaped steel blocks (17) are respectively distributed with the plurality of first movable contact pieces (12) and the plurality of second movable contact pieces (14) in a longitudinally displaced manner, so that they will not affect the arc extinguishing chamber (15).

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