Direct-current bus quick-break switch device with self-diagnosis function

Abstract

The invention belongs to the technical field of quick-break switches, and particularly relates to a direct-current bus quick-break switch device with a self-diagnosis function, the direct-current bus quick-break switch device comprises a main shell, a self-diagnosis mechanism, an arc isolation mechanism and a locking mechanism, and the main shell is internally provided with a mounting cavity; the self-diagnosis mechanism is arranged in the mounting cavity and used for monitoring the real-time magnitude of the current passing through the working line and disconnecting the working line when the current passing through the working line instantly increases, the self-diagnosis mechanism comprises an electromagnet fixedly arranged at the bottom of an inner cavity of the mounting cavity, and a vertical insulating elastic piece is fixedly arranged on the top wall of the electromagnet; a magnetic suction plate is fixedly arranged at the top end of the insulating elastic piece. According to the invention, the current of the working line of the direct-current bus can be effectively monitored, and the circuit can be quickly and automatically disconnected when the current instantly increases and exceeds a threshold value, thereby realizing overcurrent protection; the self-diagnosis mechanism is tightly matched with the arc isolation mechanism, and the arc isolation plate obstructs a conductive part in time at the moment of circuit breaking, thereby preventing arc generation and guaranteeing equipment safety.

Description

Technical Field

[0001] The invention relates to the technical field of quick-break switches, in particular to a DC bus quick-break switch device with a self-diagnosis function. Background Art

[0002] In a DC bus system, abnormal changes in current may cause a series of line faults and even damage to the equipment. Traditional switch devices usually lack effective self-diagnosis functions and rapid response mechanisms, which makes them often unable to cut off the circuit in time to prevent potential damage when faced with sudden changes in current. In addition, these devices have insufficient protection measures for arcs generated after the circuit is disconnected and cannot provide adequate protection, which increases the risk of arc accidents. At the same time, it is not conducive to properly restricting improper operations by non-professionals, which further increases the safety risks of the DC bus system. Therefore, it is necessary to develop a DC bus quick-break switch device with self-diagnosis function. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0005] A DC bus quick-break switch device with a self-diagnosis function, comprising:

[0006] A main housing, wherein a mounting cavity is provided inside the main housing;

[0007] A self-diagnosis mechanism is arranged in the installation cavity to monitor the real-time size of the current passing through the working circuit, and when the current passing through the working circuit becomes larger instantaneously, the working circuit is disconnected. The self-diagnosis mechanism includes an electromagnet fixedly arranged at the bottom of the inner cavity of the installation cavity, a vertical insulating elastic member is fixedly arranged on the top wall of the electromagnet, a magnetic suction plate is fixedly arranged on the top of the insulating elastic member, and the magnetic suction plate is located directly above the electromagnet. A lifting block is fixedly arranged on the top of the magnetic suction plate through an insulating plate, and a conductive block is fixedly arranged on the right side wall of the lifting block through two fixed frames arranged at intervals. The top of the conductive block is concavely provided with a transverse arc groove, and a transverse conductive rod located directly above the arc groove is fixedly arranged on the right side wall of the inner cavity of the installation cavity. One end of the conductive rod is fixedly connected to a first wiring, and the other end of the first wiring is located outside the main shell. The left side of the conductive block is fixedly connected to a second wiring, and the electromagnet forms a series circuit with the other end of the second wiring and one end of the third wiring, and the other end of the third wiring is located outside the main shell; the other end of the first wiring and the other end of the third wiring are connected in series to the working circuit;

[0008] The arc isolation mechanism is symmetrically arranged in the installation cavity and is used to isolate the conductive rod and the arc groove from objects when the distance between the conductive rod and the arc groove is set. The arc isolation mechanism includes a follower rod arranged on one side of the fixing frame, and a vertical rack is fixedly arranged on the other end of the follower rod. The inner cavity of the installation cavity is located at the front and rear sides of the conductive block and is rotatably provided with a driving rod. When the lifting block descends, the rack drives the driving rod to rotate through the speed change gear set. The two driving rods are provided with movable plates through threaded screw transmission. The two movable plates move toward each other and are provided with arc isolation plates at the bottom for isolating the conductive rod and the arc groove from objects.

[0009] The locking mechanism is arranged on each of the driving rods and is used to limit the rotation direction of the driving rod, so that the driving rod can only rotate in one direction as the rack descends, thereby achieving self-locking.

[0010] As a preferred solution of the DC bus quick-break switch device with self-diagnosis function described in the present invention, the main housing has an open top wall, and a device cover is provided on the top of the main housing which is disassembled and assembled by screws.

[0011] As a preferred solution of the DC bus quick-break switch device with self-diagnosis function described in the present invention, wherein: the insulating elastic member is a spring and is made of a non-magnetic material, and the insulating elastic member pushes the conductive block to rise through the magnetic suction plate, the insulating plate, the lifting block and the fixing frame, so that the arc-shaped groove presses against the conductive rod;

[0012] When the current passing through the working circuit does not exceed the threshold value, the magnetic force applied by the electromagnet to the magnetic suction plate is not greater than the elastic force of the insulating elastic member, the insulating elastic member pushes the conductive block to maintain a relative height, the conductive rod contacts the groove located in the arc groove, and the working circuit is in a normal power-on state;

[0013] When the real-time magnitude of the current passing through the working circuit exceeds a threshold value, the magnetic force exerted by the electromagnet on the magnetic suction plate is greater than the elastic force of the insulating elastic part, the electromagnet adsorbs the magnetic suction plate and the insulating elastic part is compressed, the conductive block drops accordingly, the conductive rod is spaced apart from the arc-shaped slot, the first connection and the second connection are disconnected, and the working circuit is in an open circuit state.

[0014] As a preferred solution of a DC bus quick-break switch device with self-diagnosis function described in the present invention, the conductive rod is in the shape of a circular strip, the arc groove is opened in a semicircular shape with a smooth upper edge, and the outer diameter of the conductive rod is equal to the inner diameter of the arc groove.

[0015] As a preferred solution of a DC bus quick-break switch device with self-diagnosis function described in the present invention, the top of the lifting block slides through the top wall of the equipment cover, and a manual emergency button is provided at the top of the lifting block.

[0016] As a preferred solution of a DC bus quick-break switch device with self-diagnosis function described in the present invention, the arc isolation mechanism includes a follower rod arranged on one side of a fixed frame, a vertical rack is fixedly arranged on the other end of the follower rod, the inner cavity of the installation cavity is located on the front and rear sides of the conductive block and a driving rod is rotatably arranged, and the rack drives the driving rod to rotate through a speed change gear set as the lifting block descends, and movable plates are arranged on the two driving rods through threaded screw transmission, the two movable plates move toward each other and the bottom is provided with arc isolation plates for object blocking of the conductive rod and the arc groove.

[0017] As a preferred solution of a DC bus quick-break switch device with self-diagnosis function described in the present invention, the arc isolation mechanism also includes two support frames fixedly arranged on the bottom wall of the installation cavity, each of the support frames is provided with a first opening on one side for the follower rod to be lifted and lowered, and a second opening on one side for the transmission of the rack and the speed change gear set, a vertical limit guide rod is fixedly arranged between the upper and lower inner side walls of the second opening, and the upper and lower ends of the rack are vertically slid through by the rod body of the limit guide rod through a linear bearing.

[0018] As a preferred solution of a DC bus quick-break switch device with self-diagnosis function described in the present invention, wherein: the right side wall of the second opening is fixedly installed with a first side plate at the rear and a second side plate at the front, the speed gear set includes a first transmission rod and a second transmission rod which are rotatably arranged on the side wall of the first side plate through a bearing seat, the rod body of the second transmission rod rotates and slides in a close fit through the side wall of the movable plate, the rod body of the first transmission rod is fixedly provided with a first speed gear engaging with a rack, the rod body of the second transmission rod is fixedly provided with a second speed gear engaging with the first speed gear and a third speed gear located on one side of the second speed gear, the rod body of the drive rod is rotated through the side wall of the second side plate through a bearing sleeve and a fourth speed gear engaging with the third speed gear is fixedly provided at one end, and the outer diameters of the first speed gear and the third speed gear are both larger than the outer diameters of the second speed gear and the fourth speed gear.

[0019] As a preferred solution of a DC bus quick-break switch device with self-diagnosis function described in the present invention, one end of the arc isolation plate close to the conductive rod is protruding with a convex strip, and the other end of the arc isolation plate close to the conductive rod is concave with a groove aligned with the convex strip, and the convex strip is made of rubber material and the convex strip and the groove have an interference fit.

[0020] As a preferred solution of a DC bus quick-break switch device with self-diagnosis function described in the present invention, the locking mechanism includes a ratchet fixed on the rod body of the driving rod, a mounting plate is fixedly provided on the top of the second side plate, a rotating shaft is rotatably provided on the side wall of the mounting plate through a bearing seat, a non-return pawl adapted to the ratchet is provided at the end of the rotating shaft, a torsion spring is provided between the mounting plate and the non-return pawl, the torsion spring is sleeved on the outside of the rotating shaft, and the torsion spring pushes the lower end of the non-return pawl to be stuck in the tooth groove between adjacent teeth of the ratchet.

[0021] The beneficial effects of the present invention are as follows: the device can effectively monitor the current of the DC bus working line, and when the current instantaneously increases and exceeds the threshold, the circuit can be automatically disconnected quickly to achieve overcurrent protection;

[0022] The self-diagnosis mechanism and arc isolation mechanism are closely coordinated. At the moment of circuit breaking, the arc isolation plate will timely block the conductive parts to prevent arcing and ensure the safety of the equipment.

[0023] The locking mechanism provided appropriately restricts the random operation by non-professionals, which is beneficial to ensuring the safe operation and standardization, and improves the stability and safety of the DC bus circuit as a whole, and reduces the risk of failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in combination with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a schematic structural diagram of the cross-section internal components of the main housing and the device cover of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the internal components of the installation chamber of the present invention;

[0028] Figure 4 For the present invention Figure 3 A schematic diagram of the structure from a side view;

[0029] Figure 5 It is a structural schematic diagram of the arc isolation mechanism of the present invention;

[0030] Figure 6 For the present invention Figure 5 Exploded diagram of

[0031] Figure 7 It is a schematic diagram of the structure of the speed change gear set of the present invention when viewed from above;

[0032] Figure 8 It is a structural schematic diagram of the locking mechanism of the present invention;

[0033] Fig. 9 For the present invention Figure 4 Schematic diagram of the structure when the middle arc isolation plate blocks the conductive rod and the arc groove.

[0034] In the figure: main housing 100, installation cavity 101, device cover 102, screw 103, self-diagnosis mechanism 200, electromagnet 201, insulating elastic member 202, magnetic suction plate 203, insulating plate 204, lifting block 205, fixing frame 206, conductive block 207, arc groove 208, conductive rod 209, first connection 210, second connection 211, third connection 212, manual emergency button 213, arc isolation mechanism 300 , follower rod 301, rack 302, drive rod 303, movable plate 304, arc isolation plate 305, support frame 306, first opening 307, second opening 308, limiting guide rod 309, first side plate 310, second side plate 311, first transmission rod 312, second transmission rod 313, first speed change gear 314, second speed change gear 315, third speed change gear 316, fourth speed change gear 317, convex strip 318,

[0035] Locking mechanism 400 , ratchet 401 , mounting plate 402 , rotating shaft 403 , non-return pawl 404 , torsion spring 405 . DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0039] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] See also Figure 1-Figure 9 , which shows a schematic diagram of the structure of a DC busbar quick-break switch device with a self-diagnosis function according to the present invention, please refer to Figure 1-Figure 9 , a DC bus quick-break switch device with self-diagnosis function is introduced in detail.

[0041] A DC bus quick-break switch device with a self-diagnosis function, comprising:

[0042] The main housing 100 has an installation cavity 101 disposed therein. The main housing 100 is open at the top wall, and a device cover 102 is disposed on the top of the main housing 100 for assembly and disassembly by means of screws 103. The screws 103 are special-shaped screws, and the ends of the screws need to be screwed with corresponding tools to open the device cover 102.

[0043] The self-diagnosis mechanism 200 is arranged in the installation cavity 101 to monitor the real-time size of the current passing through the working circuit, and when the current passing through the working circuit becomes instantaneously large, the working circuit is disconnected. The self-diagnosis mechanism 200 includes an electromagnet 201 fixedly arranged at the bottom of the inner cavity of the installation cavity 101, and the top wall of the electromagnet 201 is fixedly provided with a vertical insulating elastic member 202, and the top of the insulating elastic member 202 is fixedly provided with a magnetic suction plate 203, and the magnetic suction plate 203 is located directly above the electromagnet 201. The top of the magnetic suction plate 203 is fixedly provided with a lifting block 205 through an insulating plate 204, and the right side wall of the lifting block 205 is fixedly provided with a conductive block through two fixed frames 206 arranged at intervals. 207, the top of the conductive block 207 is concavely provided with a transverse arc groove 208, the right side wall of the inner cavity of the installation cavity 101 is fixedly provided with a transverse conductive rod 209 located just above the arc groove 208, one end of the conductive rod 209 is fixedly connected to a first wiring 210, the other end of the first wiring 210 is located outside the main housing 100, the left side of the conductive block 207 is fixedly connected to a second wiring 211, the electromagnet 201 forms a series circuit with the other end of the second wiring 211 and one end of the third wiring 212, the other end of the third wiring 212 is located outside the main housing 100; the other end of the first wiring 210 and the other end of the third wiring 212 are connected in series on the working circuit;

[0044] The arc isolation mechanism 300 is symmetrically arranged in the installation cavity 101 and is used to isolate the conductive rod 209 and the arc groove 208 from objects when the conductive rod 209 and the arc groove 208 are spaced apart. The arc isolation mechanism 300 includes a follower rod 301 arranged on one side of the fixing frame 206, and a vertical rack 302 is fixedly arranged on the other end of the follower rod 301. The inner cavity of the installation cavity 101 is located at the front and rear sides of the conductive block 207 and is rotatably provided with a driving rod 303. The rack 302 drives the driving rod 303 to rotate through a speed change gear set as the lifting block 205 descends. A movable plate 304 is arranged on the two driving rods 303 through a threaded screw transmission. The two movable plates 304 move toward each other and are both provided with arc isolation plates 305 at the bottom for isolating the conductive rod 209 and the arc groove 208 from objects.

[0045] The locking mechanism 400 is disposed on each of the driving rods 303 to limit the rotation direction of the driving rods 303 , so that the driving rods 303 can only rotate in one direction as the rack 302 descends, thereby achieving self-locking.

[0046] The insulating elastic member 202 is a spring and is made of a non-magnetic material. The insulating elastic member 202 pushes the conductive block 207 upward through the magnetic suction plate 203, the insulating plate 204, the lifting block 205 and the fixing frame 206, so that the arc groove 208 presses against the conductive rod 209. The insulating elastic member 202 made of a non-magnetic material can reduce the influence of the electromagnet 201 on the insulating elastic member 202.

[0047] When the current passing through the working circuit does not exceed the threshold value, the magnetic force exerted by the electromagnet 201 on the magnetic suction plate 203 is not greater than the elastic force of the insulating elastic member 202, the insulating elastic member 202 pushes the conductive block 207 to maintain a relative height, the conductive rod 209 abuts against the groove located in the arc groove 208, and the working circuit is in a normal power-on state;

[0048] When the current passing through the working circuit exceeds the threshold value, the magnetic force applied by the electromagnet 201 to the magnetic suction plate 203 is greater than the elastic force of the insulating elastic member 202, the electromagnet 201 adsorbs the magnetic suction plate 203 and the insulating elastic member 202 is compressed, the conductive block 207 is lowered accordingly, the conductive rod 209 is spaced apart from the arc groove 208, the first connection 210 and the second connection 211 are disconnected, and the working circuit is in an open circuit state;

[0049] It should be noted that the threshold value in this embodiment can be set by the manufacturer according to the elastic force of the insulating elastic member and the current specified in the circuit to be used by the device;

[0050] The conductive rod 209 is in the shape of a circular strip, the arc groove 208 is in the shape of a semicircle and has a smooth upper edge, and the outer diameter of the conductive rod 209 is equal to the inner diameter of the arc groove 208. Since the outer diameter of the conductive rod 209 is equal to the inner diameter of the arc groove 208, when the insulating elastic member 202 pushes the conductive block 207, the contact area between the circular conductive rod 209 and the semicircular arc groove 208 is larger, and the power supply is more stable. The circular conductive rod 209 and the arc groove 208 with a smooth upper edge enable the conductive rod 209 to better enter the arc groove 208 when the conductive block 207 rises;

[0051] The top of the lifting block 205 slides through the top wall of the equipment cover 102, and a manual emergency button 213 is provided on the top of the lifting block 205. When an emergency occurs and the working line needs to be disconnected, the lifting block 205 can be manually pressed down by the manual emergency button 213. Similarly, due to the locking mechanism 400, the lifting block 205 needs to be reset by a professional after being manually pressed down.

[0052] Embodiment 2: Based on Embodiment 1, the arc isolation mechanism 300 further comprises two support frames 306 fixedly arranged on the bottom wall of the inner cavity of the installation cavity 101, and each of the support frames 306 has a first opening 307 for lifting and lowering the follower rod 301 on one side and a second opening 308 for transmission between the rack 302 and the speed change gear set on the other side;

[0053] A vertical limiting guide rod 309 is fixedly disposed between the upper and lower inner side walls of the second opening 308, and the upper and lower ends of the rack 302 are vertically slidably penetrated by the rod body of the limiting guide rod 309 through linear bearings. The setting of the limiting guide rod 309 can ensure that the rack 302 can vertically descend or ascend along the limiting guide rod 309;

[0054] The right side wall of the second opening 308 is fixedly mounted with a first side plate 310 at the rear and a second side plate 311 at the front. The speed change gear set includes a first transmission rod 312 and a second transmission rod 313 which are rotatably mounted on the side wall of the first side plate 310 through a bearing seat. The rod body of the second transmission rod 313 rotates and fits and slides through the side wall of the movable plate 304. The rod body of the first transmission rod 312 is fixedly mounted with a first speed change gear 314 which meshes with the rack 302. The second transmission rod 313 is fixedly mounted with a first transmission gear 314 which meshes with the rack 302. A second speed gear 315 meshing with the first speed gear 314 and a third speed gear 316 located at one side of the second speed gear 315 are fixedly arranged on the rod body of the driving rod 303. The rod body of the driving rod 303 rotates through the side wall of the second side plate 311 through the bearing sleeve and a fourth speed gear 317 meshing with the third speed gear 316 is fixedly arranged at one end. The outer diameters of the first speed gear 314 and the third speed gear 316 are larger than the outer diameters of the second speed gear 315 and the fourth speed gear 317. Since the lifting block 205 has a short descending distance, which is not enough to control the driving rod 303 to rotate more times to adjust the distance between the two movable plates 304, a speed gear set is provided to increase the number of rotations of the driving rod 303. When the lifting block 205 descends, the rack 302 is driven to descend synchronously through the fixed frame 206 and the follower rod 301. The rack 302 drives the second transmission rod 313 to rotate rapidly through the first speed gear 314 and the second speed gear 315. Then, the third speed gear 316 and the fourth speed gear 317 are used to drive the second transmission rod 313 to rotate rapidly. The speed gear 317 drives the driving rod 303 to rotate faster. Since the movable plate 304 is respectively threaded and rotated through the driving rod 303 and the second transmission rod 313, the movable plate 304 can only move gradually toward the position where the conductive rod 209 and the arc groove 208 are located along the rod body of the driving rod 303 and the second transmission rod 313. When the lifting block 205 is completely lowered, the ends of the two movable plates 304 touch each other, thereby blocking the conductive rod 209 and the arc groove 208, thereby preventing the formation of an electric arc.

[0055] One end of the arc isolation plate 305 close to the conductive rod 209 is provided with a convex strip 318, and the other end of the arc isolation plate 305 close to the conductive rod 209 is provided with a groove aligned with the convex strip 318, and the convex strip 318 is made of rubber material and the convex strip 318 and the groove are interference fit. The convex strip 318 has a certain elasticity and is interference fit with the groove, so that the two arc isolation plates 305 are more stable after being connected, which is conducive to blocking the arc.

[0056] Embodiment 3: On the basis of Embodiment 2, the locking mechanism 400 includes a ratchet 401 fixed on the rod body of the driving rod 303, a mounting plate 402 is fixedly provided on the top of the second side plate 311, a rotating shaft 403 is rotatably provided on the side wall of the mounting plate 402 through a bearing seat, a non-return pawl 404 adapted to the ratchet 401 is provided at the end of the rotating shaft 403, a torsion spring 405 is provided between the mounting plate 402 and the non-return pawl 404, the torsion spring 405 is sleeved on the outside of the rotating shaft 403, and the torsion spring 405 pushes the lower end of the non-return pawl 404 to be stuck in the tooth groove between adjacent teeth of the ratchet 401;

[0057] When the current passing through the working circuit of the device exceeds the threshold value and the working circuit is disconnected, due to the internal locking mechanism 400, the device can only be reset by professionals with professional tools. Before resetting, the main switch of the entire circuit is disconnected first, thereby completely disconnecting the power supply of the working circuit to ensure safety when resuming operations. The professional then opens the special-sex screw with a special tool, manually pulls the non-return pawl 404 so that the lower end of the non-return pawl 404 is temporarily away from the tooth groove of the ratchet 401, and the conductive block 207 can be reset and raised through the insulating elastic member 202. After resetting, the non-return pawl 404 is released, and the torsion spring 405 pushes the lower end of the non-return pawl 404 to continue to be stuck in the tooth groove of the ratchet 401, and then the equipment cover 102 is installed, the main switch of the entire circuit is turned on, and the power supply of the working circuit is restored, which appropriately prevents non-professionals from privately opening the working circuit after the circuit is disconnected.

[0058] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A DC bus quick-break switch device with self-diagnosis function, characterized in that: include: A main housing (100), wherein a mounting cavity (101) is provided inside the main housing (100); The self-diagnosis mechanism (200) is arranged in the installation cavity (101) and is used to monitor the real-time magnitude of the current passing through the working circuit, and disconnect the working circuit when the current passing through the working circuit increases instantaneously. The self-diagnosis mechanism (200) comprises an electromagnet (201) fixedly arranged at the bottom of the inner cavity of the installation cavity (101), a vertical insulating elastic member (202) fixedly arranged on the top wall of the electromagnet (201), a magnetic suction plate (203) fixedly arranged on the top of the insulating elastic member (202), the magnetic suction plate (203) being located directly above the electromagnet (201), a lifting block (205) fixedly arranged on the top of the magnetic suction plate (203) via an insulating plate (204), and a conductive block (206) fixedly arranged on the right side wall of the lifting block (205) via two fixed frames (206) arranged at intervals. 07), the top of the conductive block (207) is inwardly concave with a transverse arc groove (208), the right side wall of the inner cavity of the installation cavity (101) is fixedly provided with a transverse conductive rod (209) located directly above the arc groove (208), one end of the conductive rod (209) is fixedly connected to a first wiring (210), the other end of the first wiring (210) is located outside the main shell (100), the left side of the conductive block (207) is fixedly connected to a second wiring (211), the electromagnet (201) forms a series circuit with the other end of the second wiring (211) and one end of the third wiring (212), the other end of the third wiring (212) is located outside the main shell (100); the other end of the first wiring (210) and the other end of the third wiring (212) are connected in series on the working circuit; An arc isolation mechanism (300) is symmetrically arranged in the installation cavity (101) and is used to isolate the conductive rod (209) and the arc-shaped groove (208) from each other when the conductive rod (209) and the arc-shaped groove (208) are spaced apart from each other; The locking mechanism (400) is arranged on each of the driving rods (303) and is used to limit the rotation direction of the driving rod (303), so that the driving rod (303) can only rotate in one direction as the rack (302) descends.

2. A DC bus quick-break switch device with self-diagnosis function according to claim 1, characterized in that: The main housing (100) is in an open top wall shape, and a device cover (102) is provided on the top of the main housing (100) for assembly and disassembly via screws (103).

3. A DC bus quick-break switch device with self-diagnosis function according to claim 1, characterized in that: The insulating elastic member (202) is a spring and is made of a non-magnetic material. The insulating elastic member (202) pushes the conductive block (207) to rise through the magnetic suction plate (203), the insulating plate (204), the lifting block (205) and the fixing frame (206), so that the arc groove (208) presses upward to contact the conductive rod (209); When the current passing through the working circuit is not greater than a threshold value, the magnetic force applied by the electromagnet (201) to the magnetic suction plate (203) is not greater than the elastic force of the insulating elastic member (202), the insulating elastic member (202) pushes the conductive block (207) to maintain a relative height, the conductive rod (209) contacts the groove located in the arc groove (208), and the working circuit is in a normal power-on state; When the real-time magnitude of the current passing through the working circuit exceeds a threshold value, the magnetic force exerted by the electromagnet (201) on the magnetic suction plate (203) is greater than the elastic force of the insulating elastic member (202), the electromagnet (201) adsorbs the magnetic suction plate (203) and the insulating elastic member (202) is compressed, the conductive block (207) descends accordingly, the conductive rod (209) is spaced apart from the arc-shaped groove (208), the first connection (210) and the second connection (211) are disconnected, and the working circuit is in an open circuit state.

4. A DC bus quick-break switch device with self-diagnosis function according to claim 1, characterized in that: The conductive rod (209) is in the shape of a circular strip, the arc-shaped groove (208) is opened in a semicircular shape and has a smooth upper edge, and the outer diameter of the conductive rod (209) is equal to the inner diameter of the arc-shaped groove (208).

5. A DC bus quick-break switch device with self-diagnosis function according to claim 2, characterized in that: The top of the lifting block (205) slides through the top wall of the equipment cover (102), and a manual emergency button (213) is provided at the top of the lifting block (205).

6. A DC bus quick-break switch device with self-diagnosis function according to claim 1, characterized in that: The arc isolation mechanism (300) comprises a follower rod (301) arranged on one side of a fixing frame (206); a vertical rack (302) is fixedly arranged on the other end of the follower rod (301); a driving rod (303) is rotatably arranged in the inner cavity of the installation cavity (101) located at the front and rear sides of the conductive block (207); the rack (302) drives the driving rod (303) to rotate through a speed change gear set as the lifting block (205) descends; movable plates (304) are arranged on the two driving rods (303) through threaded screw connection transmission; the two movable plates (304) move towards each other and are both provided with arc isolation plates (305) at the bottom for object blocking of the conductive rod (209) and the arc-shaped groove (208).

7. A DC bus quick-break switch device with self-diagnosis function according to claim 6, characterized in that: The arc isolation mechanism (300) also includes two support frames (306) fixedly arranged on the bottom wall of the inner cavity of the installation cavity (101), one side of each support frame (306) is provided with a first opening (307) for the follower rod (301) to be lifted and lowered, and one side is provided with a second opening (308) for the rack (302) and the transmission gear set to be driven, a vertical limiting guide rod (309) is fixedly arranged between the upper and lower inner side walls of the second opening (308), and the upper and lower ends of the rack (302) are vertically slidably penetrated by the rod body of the limiting guide rod (309) through a linear bearing.

8. A DC bus quick-break switch device with self-diagnosis function according to claim 6, characterized in that: The right side wall of the second opening (308) is fixedly mounted with a first side plate (310) at the rear and with a second side plate (311) at the front. The speed change gear set comprises a first transmission rod (312) and a second transmission rod (313) which are rotatably mounted on the side wall of the first side plate (310) through a bearing seat. The rod body of the second transmission rod (313) rotates and fits and slides through the side wall of the movable plate (304). The rod body of the first transmission rod (312) is fixedly mounted with a first speed change gear (314) which meshes with the rack (302). The second transmission rod (313) is fixedly mounted with a first transmission gear (314) which meshes with the rack (302). A second speed gear (315) meshing with the first speed gear (314) and a third speed gear (316) spaced apart from one side of the second speed gear (315) are fixedly arranged on the rod body of the driving rod (303); the rod body of the driving rod (303) rotates through the side wall of the second side plate (311) through the bearing sleeve and a fourth speed gear (317) meshing with the third speed gear (316) is fixedly arranged at one end; the outer diameters of the first speed gear (314) and the third speed gear (316) are both larger than the outer diameters of the second speed gear (315) and the fourth speed gear (317).

9. A DC bus quick-break switch device with self-diagnosis function according to claim 1, characterized in that: One end of the arc isolation plate (305) close to the conductive rod (209) is protrudingly provided with a convex strip (318), and one end of the other arc isolation plate (305) close to the conductive rod (209) is concavely provided with a groove aligned with the convex strip (318), the convex strip (318) is made of rubber material, and the convex strip (318) and the groove are interference fit.

10. A DC bus quick-break switch device with self-diagnosis function according to claim 8, characterized in that: The locking mechanism (400) comprises a ratchet (401) fixed on the rod body of the driving rod (303); a mounting plate (402) is fixedly arranged on the top of the second side plate (311); a rotating shaft (403) is rotatably arranged on the side wall of the mounting plate (402) through a bearing seat; a non-return pawl (404) adapted to the ratchet (401) is arranged at the end of the rotating shaft (403); a torsion spring (405) is arranged between the mounting plate (402) and the non-return pawl (404); the torsion spring (405) is sleeved on the outside of the rotating shaft (403), and the torsion spring (405) pushes the lower end of the non-return pawl (404) to be clamped into the tooth groove between adjacent teeth of the ratchet (401).

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