A double-breakpoint DC circuit breaker

Abstract

The present invention discloses a double-breakpoint DC circuit breaker, comprising: a frame; a conductive system, the conductive system is used to connect to an external circuit; a contact operating system, the contact operating system is arranged in the conductive system, the lower end of the contact operating system passes through the conductive system, the contact operating system is used to perform opening and closing operations on the conductive system; a tripping operating system, the tripping operating system is arranged at the lower end of the contact operating system, the tripping operating system is used to control the opening and closing operations of the contact operating system; an electromagnetic closing system, the electromagnetic closing system drives the contact operating system to perform closing operations through the tripping operating system. The present invention has a simple structure, reliable operation and convenient maintenance; it adopts a mechanical holding method, does not consume a large amount of electric energy during use, and the opening process is not affected by voltage changes; the closing power is small, no additional rectification equipment is required, and the operation is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a double-breakpoint DC circuit breaker. Background Art

[0002] With the continuous development of technology, DC power systems have been more and more widely used in industries such as electrified railways, urban traction, mining, steel rolling and chemical industry. As an important device in DC circuits, double-breakpoint DC circuit breakers have also become a top priority. Double-breakpoint DC circuit breakers play a protective role against short circuits and overloads in DC circuits. However, DC circuit breakers in the prior art are often complex in structure, difficult to maintain, and require additional rectification equipment during use. Summary of the invention

[0003] In view of this, in order to solve the above problems, the object of the present invention is to provide a double-breakpoint DC circuit breaker, comprising:

[0004] A rack, the rack comprising a rack base, a first bracket platform, a second bracket platform and four support columns, the first bracket platform and the second bracket platform are respectively arranged at two ends of the upper surface of the rack base, and the four support columns are respectively arranged around the upper surface of the first bracket platform;

[0005] A conductive system, the conductive system is arranged at the upper ends of the four support columns, and the conductive system is used to connect to an external circuit;

[0006] A contact operating system, wherein the contact operating system is arranged in the conductive system, the lower end of the contact operating system passes through the conductive system, and the contact operating system is used to perform opening and closing operations on the conductive system;

[0007] A tripping operating system, wherein the tripping operating system is arranged at the lower end of the contact operating system, the tripping operating system is installed on the first bracket platform, and the tripping operating system is used to control the opening and closing operations of the contact operating system;

[0008] An electromagnetic closing system is installed on the second bracket platform, and the electromagnetic closing system drives the contact operating system to perform a closing operation through a tripping operating system.

[0009] In another preferred embodiment, the conductive system comprises:

[0010] Two outgoing line rows, one of which is arranged at the upper ends of the two supporting columns, and the other of which is arranged at the upper ends of the other two supporting columns, the two outgoing line rows are respectively connected to the input end and the output end of the external circuit, and the surfaces of the two outgoing line rows close to each other are each provided with a second contact point;

[0011] An outlet connection seat, the outlet connection seat is arranged between the two outlet rows, and a lifting hole is provided in the middle position of the outlet connection seat along the vertical direction;

[0012] Two arc static contacts, the two arc static contacts are respectively arranged at the upper ends of the two outgoing line rows, the two arc static contacts are respectively arranged at both sides of the outgoing line connection seat, the upper ends of the two arc static contacts are both facing the other side relative to the outgoing line connection seat, and the two arc static contacts are each provided with a first contact point on one side close to the outgoing line connection seat;

[0013] An arc extinguishing chamber is provided at the upper ends of the two outgoing line rows, and the two arc static contacts are both provided in the arc extinguishing chamber.

[0014] In another preferred embodiment, the contact operating system comprises: a contact rod, an arc-moving contact, an active contact and a disconnecting spring structure, the contact rod is installed in the lifting hole in a liftable manner, the arc-moving contact, the active contact and the disconnecting spring structure are sequentially arranged on the contact rod from top to bottom, the arc-moving contact is arranged above the outlet connection seat, the active contact is arranged below the outlet connection seat, and the disconnecting spring structure is arranged at the lower end of the active contact;

[0015] The contact rod is operable to be in a raised state or a lowered state;

[0016] When the contact rod is in the raised state, the two sides of the upper end of the arc moving contact are respectively connected to the two first contacts, and the two sides of the upper end of the active contact are respectively connected to the two second contacts;

[0017] When the contact rod is in a descending state, the arc moving contact is disconnected from the two first contacts, and the active contact is disconnected from the two second contacts.

[0018] In another preferred embodiment, the opening spring structure includes: a spring upper mounting plate, a spring lower mounting plate and a spring, wherein the spring upper mounting plate is fixedly arranged at the lower end of the active contact, the upper end of the spring is arranged at the lower end of the spring upper mounting plate, the spring lower mounting plate is arranged below the spring, and there is a certain gap between the spring lower mounting plate and the bottom end of the contact rod, and the spring lower mounting plate performs an ascending action or a descending action under the action of the tripping operating system. In another preferred embodiment, the tripping operating system includes:

[0019] A trip magnet, the trip magnet is fixedly mounted on one of the outgoing line rows, and the trip magnet generates greater magnetism when an external circuit is overloaded or short-circuited;

[0020] An impact armature, wherein the impact armature is arranged directly below the release magnet, and a certain gap is arranged between the impact armature and the release magnet;

[0021] A holding magnet, wherein the holding magnet is fixedly arranged at the lower end of the impact armature, and when an external circuit is overloaded or short-circuited, the holding magnet is attracted by the tripping magnet;

[0022] A magnet support, on which the retaining magnet is fixedly mounted;

[0023] a first lever mounting seat, the first lever mounting seat being disposed at one end of the upper surface of the first bracket platform;

[0024] A trip lever, wherein the middle position of the trip lever is rotatably mounted on the first lever mounting seat, one end of the trip lever is rotatably mounted on the lower end of the magnet support, and one end of the trip lever is raised or lowered under the action of the trip magnet and the holding magnet;

[0025] A bolt, wherein the bolt is arranged at the other end of the tripping lever along the vertical direction;

[0026] a second lever mounting seat, the second lever mounting seat being disposed at a middle position of an upper surface of the first bracket platform;

[0027] A transmission lever, the transmission lever is mounted on the second lever mounting seat, one end of the transmission lever is arranged below the bolt, and when an external circuit is overloaded or short-circuited, the one end of the transmission lever moves downward under the pressing action of the bolt;

[0028] A mounting plate, the mounting plate being mounted on the other end of the upper surface of the first bracket platform along the vertical direction;

[0029] A round shaft rod, the round shaft rod is arranged at the lower part of one end of the mounting plate close to the second lever mounting seat, a locking groove is arranged in the middle position of the round shaft rod, when the double-breakpoint DC circuit breaker is in a closed state, the locking groove is arranged toward the second lever mounting seat, when the double-breakpoint DC circuit breaker is in an open state, the locking groove faces upward;

[0030] A contact piece, the contact piece is arranged on one side of the round shaft rod, and the contact piece is arranged above the other end of the transmission lever. When an external circuit is overloaded or short-circuited, the contact piece drives the round shaft rod to rotate under the downward pressure of the other end of the transmission lever, so that the direction of the lock slot rotates to the top;

[0031] A support lever, the support lever is rotatably mounted on the upper portion of one end of the mounting plate close to the second lever mounting seat, one end of the support lever is disposed on the lower surface of the spring lower mounting plate, and the spring lower mounting plate is lifted up and lowered under the action of the support lever;

[0032] A right-angle limit rod, the right-angle limit rod is a right-angle structure, the bending part of the right-angle limit rod is rotatably mounted on the upper part of the mounting plate relative to the other end of the round shaft rod, and one end of the right-angle limit rod is arranged above the other end of the support lever;

[0033] A first connecting rod, one end of which is rotatably mounted on the other end of the right-angle limit rod, and a linkage shaft is rotatably mounted on the other end of the first connecting rod;

[0034] a second connecting rod, one end of which is rotatably mounted on the linkage shaft;

[0035] A locking plate is arranged at the other end of the second connecting rod, and the locking plate matches the locking groove.

[0036] In another preferred embodiment, the electromagnetic closing system comprises:

[0037] An electromagnetic tube, the electromagnetic tube is installed on the upper surface of the second bracket platform;

[0038] A magnetic rod, the magnetic rod is installed in the electromagnetic cylinder in a liftable manner;

[0039] A third lever mounting seat, the third lever mounting seat is arranged on the frame base, and the third lever mounting seat is located between the first bracket platform and the second bracket platform;

[0040] A closing lever, wherein the closing lever is mounted on the third lever mounting seat, and one end of the closing lever is rotatably connected to the lower end of the magnetic rod;

[0041] A transmission push rod, the lower end of which is rotatably mounted on the other end of the closing lever, and the upper end of which is rotatably mounted on the linkage shaft.

[0042] In another preferred embodiment, the active contact is made of silver alloy material.

[0043] In another preferred embodiment, the arc moving contact and the two arc static contacts are both made of copper.

[0044] In another preferred embodiment, a current indicator plate is further provided on one of the outgoing line banks, and the current indicator plate is used to observe the magnitude of the current passing through the two outgoing line banks.

[0045] Due to the adoption of the above technical solution, the present invention has the following positive effects compared with the prior art:

[0046] (1) The present invention has a simple structure, reliable operation and convenient maintenance;

[0047] (2) The present invention adopts a mechanical holding method, which does not consume a large amount of electric energy during use and the opening process is not affected by voltage changes;

[0048] (3) The present invention has a small closing power, does not require additional rectification equipment and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic diagram of a double-breakpoint DC circuit breaker of the present invention;

[0050] Figure 2 It is a structural diagram of a double-breakpoint DC circuit breaker of the present invention;

[0051] Figure 3 It is a partial schematic diagram of a double-breakpoint DC circuit breaker of the present invention.

[0052] In the attached drawings: 100, frame; 101, frame base; 102, first bracket platform; 103, second bracket platform; 104, support column; 200, conductive system; 300, contact operating system; 400, tripping operating system; 500, electromagnetic closing system; 201, outlet row; 202, outlet connection seat; 203, arc static contact; 204, arc extinguishing chamber; 310, contact rod; 320, arc moving contact; 330, active contact; 340, opening spring structure; 341, spring upper mounting plate; 343, spring lower mounting plate; 342, spring; 401, tripping magnet ; 402, impact armature; 403, holding magnet; 404, magnet support; 405, first lever mounting seat; 406, release lever; 407, bolt; 408, second lever mounting seat; 409, transmission lever; 410, mounting plate; 411, round shaft rod; 412, contact piece; 413, support lever; 414, right-angle limit rod; 415, first connecting rod; 416, second connecting rod; 417, locking plate; 501, electromagnetic tube; 502, magnetic rod; 503, third lever mounting seat; 504, closing lever; 505, transmission top rod; 600, current indicator plate. DETAILED DESCRIPTION

[0053] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0054] like Figures 1 to 3 As shown, a double breakpoint DC circuit breaker of a preferred embodiment is shown, comprising:

[0055] The rack 100 includes a rack base 101, a first support platform 102, a second support platform 103 and four support columns 104. The first support platform 102 and the second support platform 103 are respectively arranged at two ends of the upper surface of the rack base 101, and the four support columns 104 are respectively arranged around the upper surface of the first support platform 102;

[0056] Conductive system 200, the conductive system 200 is disposed at the upper ends of the four support pillars 104, and the conductive system 200 is used to connect to an external circuit;

[0057] A contact operating system 300, wherein the contact operating system 300 is disposed in the conductive system 200, and the lower end of the contact operating system 300 penetrates the conductive system 200, and the contact operating system 300 is used to perform opening and closing operations on the conductive system 200;

[0058] A tripping operating system 400, which is disposed at the lower end of the contact operating system 300, and is mounted on the first bracket platform 102, and is used to control the opening and closing operations of the contact operating system 300;

[0059] The electromagnetic closing system 500 is installed on the second bracket platform 103. The electromagnetic closing system 500 drives the contact operating system 300 to perform a closing operation through the trip operating system 400. Further, the double-breakpoint DC circuit breaker completes the function of opening and breaking the circuit when the external circuit is short-circuited or overloaded through the conductive system 200, the contact operating system 300 and the trip operating system 400, and then completes the closing operation after the breaking operation is completed through the electromagnetic closing system 500.

[0060] In another preferred embodiment, the conductive system 200 includes: two outgoing wire rows 201, one outgoing wire row 201 is disposed at the upper ends of the two supporting columns 104, and the other outgoing wire row 201 is disposed at the upper ends of the other two supporting columns 104, the two outgoing wire rows 201 are respectively connected to the input end and the output end of the external circuit, and the surfaces of the two outgoing wire rows 201 close to each other are each provided with a second contact point;

[0061] An outlet connection seat 202, the outlet connection seat 202 is arranged between the two outlet rows 201, and a lifting hole is provided in the middle position of the outlet connection seat 202 along the vertical direction;

[0062] Two arc static contacts 203, the two arc static contacts 203 are respectively arranged at the upper ends of the two outgoing line rows 201, the two arc static contacts 203 are respectively arranged on both sides of the outgoing line connection seat 202, the upper ends of the two arc static contacts 203 are both facing the other side relative to the outgoing line connection seat 202, and the two arc static contacts 203 are each provided with a first contact point on one side close to the outgoing line connection seat 202;

[0063] An arc extinguishing chamber 204 is provided at the upper end of the two outgoing wire rows 201, and two arc static contacts 203 are both provided in the arc extinguishing chamber 204. Further, the outgoing wire connection base 202 is made of insulating material, and the external circuit is connected to the above-mentioned conductive system 200 through the two outgoing wire rows 201. The arc static contacts 203 are made of copper material, and an arc is generated between the two arc static contacts 203, and the upper ends of the two arc static contacts 203 are away from each other relative to the lower ends. When a short circuit occurs in the circuit, the arc between the two arc static contacts 203 moves rapidly and stretches to enter the arc extinguishing chamber 204 to form a larger arc voltage, thereby limiting the continued rise of the short-circuit current. After the current enters the arc extinguishing chamber 204, it continues to accelerate to the final extinguishing position, and a magnetic conductive material is added to the arc extinguishing chamber 204 to generate an attraction for the arc. Furthermore, a magnetic blow-out circuit is also provided on the arc extinguishing chamber 204, and the magnetic blow-out circuit is used to accelerate the arc generated on the two arc static contacts 203 to move upward quickly, thereby accelerating the arc extinguishing process.

[0064] Further, as a preferred embodiment, the contact operating system 300 includes:

[0065] The contact rod 310, the arc-moving contact 320, the active contact 330 and the opening spring structure 340 are provided on the contact rod 310 in a manner that the arc-moving contact 320, the active contact 330 and the opening spring structure 340 can be lifted and lowered in the lifting hole. The arc-moving contact 320, the active contact 330 and the opening spring structure 340 are provided on the contact rod 310 in sequence from top to bottom. The arc-moving contact 320 is provided above the outlet connection seat 202, the active contact 330 is provided below the outlet connection seat 202, and the opening spring structure 340 is provided at the lower end of the active contact 330.

[0066] The contact rod 310 is operable to be in a raised state or a lowered state;

[0067] When the contact rod 310 is in the raised state, the two sides of the upper end of the arc moving contact 320 are respectively connected to the two first contacts, and the two sides of the upper end of the active contact 330 are respectively connected to the two second contacts;

[0068] When the contact rod 310 is in the descending state, the arc contact 320 is disconnected from the two first contacts, and the active contact 330 is disconnected from the two second contacts.

[0069] Furthermore, the above-mentioned fast DC circuit breaker is connected to the active contact 330 through two second contacts to connect the current circuit, and is connected to the arc contact 320 through two first contacts to form another current circuit. The above-mentioned contact operating system 300 adopts a double-breakpoint contact form, eliminating the soft connection, thereby reducing the movement inertia during the circuit breaker action and increasing the breaking speed, which is beneficial to preventing the temperature rise of the above-mentioned double-breakpoint DC circuit breaker. For circuit breakers with larger current specifications, a smaller heat sink should be added to further improve the heat dissipation conditions to ensure that the above-mentioned double-breakpoint DC circuit breaker has sufficient temperature rise margin.

[0070] Further, as a preferred embodiment, the opening spring structure 340 includes: a spring upper mounting plate 341, a spring lower mounting plate 343 and a spring 342, the spring upper mounting plate 341 is fixedly arranged at the lower end of the active contact 330, the upper end of the spring 342 is arranged at the lower end of the spring upper mounting plate 341, the spring lower mounting plate 343 is arranged below the spring 342, and there is a certain gap between the spring lower mounting plate 343 and the bottom end of the contact rod 310, and the spring lower mounting plate 343 performs an ascending action or a descending action under the action of the tripping operating system 400;

[0071] When the spring lower mounting plate 343 performs an ascending action, the spring lower mounting plate 343 pushes up the contact rod 310, and the contact rod 310 is in an ascending state;

[0072] When the mounting plate 343 under the spring moves downward, the contact rod 310 moves downward along with the mounting plate 343 under the spring, and the contact rod 310 is in a descending state.

[0073] Further, as a preferred embodiment, the tripping operation system 400 includes:

[0074] A trip magnet 401, the trip magnet 401 is fixedly mounted on an outgoing line row 201, and the trip magnet 401 generates a stronger magnetism when an external circuit is overloaded or short-circuited;

[0075] The impact armature 402 is arranged directly below the release magnet 401, and a certain gap is arranged between the impact armature 402 and the release magnet 401;

[0076] A holding magnet 403, which is fixed to the lower end of the impact armature 402. When an external circuit is overloaded or short-circuited, the holding magnet 403 is attracted by the tripping magnet 401;

[0077] A magnet support 404, which keeps the magnet 403 fixedly mounted on the magnet support 404;

[0078] A first lever mounting seat 405, the first lever mounting seat 405 is disposed at one end of the upper surface of the first bracket platform 102;

[0079] A trip lever 406, wherein the middle position of the trip lever 406 is rotatably mounted on the first lever mounting seat 405, one end of the trip lever 406 is rotatably mounted on the lower end of the magnet support 404, and one end of the trip lever 406 is raised or lowered under the action of the trip magnet 401 and the holding magnet 403;

[0080] Bolt 407, bolt 407 is arranged at the other end of the trip lever 406 along the vertical direction;

[0081] A second lever mounting seat 408, the second lever mounting seat 408 is disposed at a middle position of the upper surface of the first bracket platform 102;

[0082] A transmission lever 409, the transmission lever 409 is mounted on the second lever mounting seat 408, one end of the transmission lever 409 is arranged below the bolt 407, when the external circuit is overloaded or short-circuited, one end of the transmission lever 409 moves downward under the pressing action of the bolt 407;

[0083] A mounting plate 410, the mounting plate 410 is mounted on the other end of the upper surface of the first bracket platform 102 along the vertical direction;

[0084] A round shaft rod 411, which is disposed at the lower part of one end of the mounting plate 410 close to the second lever mounting seat 408, and a locking groove is provided in the middle of the round shaft rod 411. When the double-breakpoint DC circuit breaker is in a closed state, the locking groove is disposed toward the second lever mounting seat 408, and when the double-breakpoint DC circuit breaker is in an open state, the locking groove is directed upward;

[0085] The contact piece 412 is disposed on one side of the round shaft rod 411 and above the other end of the transmission lever 409. When an external circuit is overloaded or short-circuited, the contact piece 412 drives the round shaft rod 411 to rotate under the downward pressure of the other end of the transmission lever 409, so that the direction of the lock slot rotates to the top.

[0086] A support lever 413, the support lever 413 is rotatably mounted on the upper portion of one end of the mounting plate 410 close to the second lever mounting seat 408, one end of the support lever 413 is disposed on the lower surface of the spring lower mounting plate 343, and the spring lower mounting plate 343 performs an ascending action to lift the contact rod 310 and a descending action under the action of the support lever 413;

[0087] A right-angle limit rod 414, which is a right-angle structure. The bend of the right-angle limit rod 414 is rotatably mounted on the upper part of the other end of the mounting plate 410 relative to the round shaft rod 411. One end of the right-angle limit rod 414 is arranged above the other end of the support lever 413.

[0088] A first connecting rod 415, one end of which is rotatably mounted on the other end of the right-angle limiting rod 414, and a linkage shaft is rotatably mounted on the other end of the first connecting rod 415;

[0089] A second connecting rod 416, one end of which is rotatably mounted on the linkage shaft;

[0090] A locking plate 417, which is disposed at the other end of the second connecting rod 416, and matches the locking groove;

[0091] When the double-breakpoint DC circuit breaker is closed, one end of the support lever 413 moves upward, and the one end of the support lever 413 pushes up the spring lower mounting plate 343, and the spring lower mounting plate 343 moves upward, and the other end of the support lever 413 is limited to the inner side of one end of the right-angle limit rod 414, and at this time, the locking piece 417 is against the arc surface of the round shaft rod 411;

[0092] When the double-breakpoint DC circuit breaker is opened, one end of the trip lever 406 moves upward under the attraction of the holding magnet 403 and the trip magnet 401, and the bolt 407 on the trip lever 406 presses one end of the transmission lever 409 downward, and the other end of the transmission lever 409 drives the round shaft rod 411 to rotate upward. At this time, the direction of the lock groove on the round shaft rod 411 rotates to the top, so that the lock plate 417 falls into the lock groove, and the linkage shaft moves downward and drives the first connecting rod 415 and the right-angle limit rod 414 to make the other end of the support lever 413 move upward, and one end of the support lever 413 drives the mounting plate under the spring to descend. Furthermore, when the current on the two outgoing line rows 201 is short-circuited or overloaded, when the current flowing through is greater than the static setting value, the impact armature 402 is sucked upward toward the tripping magnet 401, and the impact armature 402 drives the tripping lever 406. The tripping lever 406 further drives the round shaft rod 411 to rotate, so that the upper locking groove is opposite to the locking plate 417, so that the locking plate 417 falls, and then drives the contact operating system 300 to perform a tripping operation, so that the contact rod 310 falls and drives the active contact 330 to disconnect from the two second contacts, and drives the two first contacts of the arc contact 320 to disconnect, thereby completing the tripping operation, and completing the reset under the drive of the electromagnetic closing system 500, preparing for the next closing.

[0093] In another preferred embodiment, the electromagnetic closing system 500 includes:

[0094] The electromagnetic tube 501 is installed on the upper surface of the second support platform 103;

[0095] A magnetic rod 502, the magnetic rod 502 is installed in the electromagnetic tube 501 in a liftable manner;

[0096] A third lever mounting seat 503, the third lever mounting seat 503 is disposed on the frame base 101, and the third lever mounting seat 503 is located between the first bracket platform 102 and the second bracket platform 103;

[0097] A closing lever 504, the closing lever 504 is mounted on the third lever mounting seat 503, and one end of the closing lever 504 is rotatably connected to the lower end of the magnetic rod 502;

[0098] The transmission push rod 505 has a lower end rotatably mounted on the other end of the closing lever 504, and an upper end of the transmission push rod 505 is rotatably mounted on the linkage shaft.

[0099] Furthermore, the electromagnetic closing system 500 drives the closing operation, and the electromagnetic cylinder 501 drives the magnetic rod 502 to move, thereby driving the transmission push rod 505 to rise and drive the locking plate 417 to reset.

[0100] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation and protection scope of the present invention.

[0101] The present invention also has the following implementation modes based on the above:

[0102] In a further embodiment of the present invention, the active contact 330 is made of a silver alloy material, thereby enhancing the electrical conductivity between the active contact 330 and the two second contacts.

[0103] In a further embodiment of the present invention, the arc moving contact 320 and the two arc stationary contacts 203 are both made of copper.

[0104] In a further embodiment of the present invention, a current indicator plate 600 is further provided on one of the outlet lines 201, and the current indicator plate 600 is used to observe the magnitude of the current passing through the two outlet lines 201. Further, it is convenient for the user to judge the current flowing through the two outlet lines 201.

[0105] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A double-breakpoint DC circuit breaker, characterized in that: include: A rack, the rack comprising a rack base, a first bracket platform, a second bracket platform and four support columns, the first bracket platform and the second bracket platform are respectively arranged at two ends of the upper surface of the rack base, and the four support columns are respectively arranged around the upper surface of the first bracket platform; A conductive system, the conductive system is arranged at the upper ends of the four support columns, and the conductive system is used to connect to an external circuit; A contact operating system, wherein the contact operating system is arranged in the conductive system, the lower end of the contact operating system passes through the conductive system, and the contact operating system is used to perform opening and closing operations on the conductive system; A tripping operating system, wherein the tripping operating system is arranged at the lower end of the contact operating system, the tripping operating system is installed on the first bracket platform, and the tripping operating system is used to control the opening and closing operations of the contact operating system; An electromagnetic closing system, the electromagnetic closing system is installed on the second bracket platform, and the electromagnetic closing system drives the contact operating system to perform a closing operation through a tripping operating system; The conductive system comprises: Two outgoing line rows, one of which is arranged at the upper ends of the two supporting columns, and the other of which is arranged at the upper ends of the other two supporting columns, the two outgoing line rows are respectively connected to the input end and the output end of the external circuit, and the surfaces of the two outgoing line rows close to each other are each provided with a second contact point; An outlet connection seat, the outlet connection seat is arranged between the two outlet rows, and a lifting hole is provided in the middle position of the outlet connection seat along the vertical direction; Two arc static contacts, the two arc static contacts are respectively arranged at the upper ends of the two outgoing line rows, the two arc static contacts are respectively arranged at both sides of the outgoing line connection seat, the upper ends of the two arc static contacts are both facing the other side relative to the outgoing line connection seat, and the two arc static contacts are each provided with a first contact point on one side close to the outgoing line connection seat; An arc extinguishing chamber, the arc extinguishing chamber is arranged at the upper ends of the two outgoing line rows, and the two arc static contacts are both arranged in the arc extinguishing chamber; The contact operating system comprises: a contact rod, an arc-moving contact, an active contact and a switch-off spring structure, wherein the contact rod is installed in the lifting hole in a liftable manner, the arc-moving contact, the active contact and the switch-off spring structure are arranged on the contact rod in sequence from top to bottom, the arc-moving contact is arranged above the outlet connection seat, the active contact is arranged below the outlet connection seat, and the switch-off spring structure is arranged at the lower end of the active contact; The contact rod is operable to be in a raised state or a lowered state; When the contact rod is in the raised state, the two sides of the upper end of the arc moving contact are respectively connected to the two first contacts, and the two sides of the upper end of the active contact are respectively connected to the two second contacts; When the contact rod is in a descending state, the arc moving contact is disconnected from the two first contacts, and the active contact is disconnected from the two second contacts; The opening spring structure comprises: a spring upper mounting plate, a spring lower mounting plate and a spring, wherein the spring upper mounting plate is fixedly arranged at the lower end of the active contact, the upper end of the spring is arranged at the lower end of the spring upper mounting plate, the spring lower mounting plate is arranged below the spring, and there is a certain gap between the spring lower mounting plate and the bottom end of the contact rod, and the spring lower mounting plate performs an ascending action or a descending action under the action of the tripping operating system; The tripping operating system comprises: A trip magnet, the trip magnet is fixedly mounted on one of the outgoing line rows, and the trip magnet generates greater magnetism when an external circuit is overloaded or short-circuited; An impact armature, wherein the impact armature is arranged directly below the release magnet, and a certain gap is arranged between the impact armature and the release magnet; A holding magnet, wherein the holding magnet is fixedly arranged at the lower end of the impact armature, and when an external circuit is overloaded or short-circuited, the holding magnet is attracted by the tripping magnet; A magnet support, on which the retaining magnet is fixedly mounted; a first lever mounting seat, the first lever mounting seat being disposed at one end of the upper surface of the first bracket platform; A trip lever, wherein the middle position of the trip lever is rotatably mounted on the first lever mounting seat, one end of the trip lever is rotatably mounted on the lower end of the magnet support, and one end of the trip lever is raised or lowered under the action of the trip magnet and the holding magnet; A bolt, wherein the bolt is arranged at the other end of the tripping lever along the vertical direction; a second lever mounting seat, the second lever mounting seat being disposed at a middle position of an upper surface of the first bracket platform; A transmission lever, the transmission lever is mounted on the second lever mounting seat, one end of the transmission lever is arranged below the bolt, and when an external circuit is overloaded or short-circuited, the one end of the transmission lever moves downward under the pressing action of the bolt; A mounting plate, the mounting plate being mounted on the other end of the upper surface of the first bracket platform along the vertical direction; A round shaft rod, the round shaft rod is arranged at the lower part of one end of the mounting plate close to the second lever mounting seat, a locking groove is arranged in the middle position of the round shaft rod, when the double-breakpoint DC circuit breaker is in a closed state, the locking groove is arranged toward the second lever mounting seat, when the double-breakpoint DC circuit breaker is in an open state, the locking groove faces upward; A contact piece, the contact piece is arranged on one side of the round shaft rod, and the contact piece is arranged above the other end of the transmission lever. When an external circuit is overloaded or short-circuited, the contact piece drives the round shaft rod to rotate under the downward pressure of the other end of the transmission lever, so that the direction of the lock slot rotates to the top; A support lever, the support lever is rotatably mounted on the upper portion of one end of the mounting plate close to the second lever mounting seat, one end of the support lever is disposed on the lower surface of the spring lower mounting plate, and the spring lower mounting plate is lifted up and lowered under the action of the support lever; A right-angle limit rod, the right-angle limit rod is a right-angle structure, the bending part of the right-angle limit rod is rotatably mounted on the upper part of the mounting plate relative to the other end of the round shaft rod, and one end of the right-angle limit rod is arranged above the other end of the support lever; A first connecting rod, one end of which is rotatably mounted on the other end of the right-angle limit rod, and a linkage shaft is rotatably mounted on the other end of the first connecting rod; a second connecting rod, one end of which is rotatably mounted on the linkage shaft; A locking plate is arranged at the other end of the second connecting rod, and the locking plate matches the locking groove.

2. The double-breakpoint DC circuit breaker according to claim 1, characterized in that: The electromagnetic closing system comprises: An electromagnetic tube, the electromagnetic tube is installed on the upper surface of the second bracket platform; A magnetic rod, the magnetic rod is installed in the electromagnetic cylinder in a liftable manner; A third lever mounting seat, the third lever mounting seat is arranged on the frame base, and the third lever mounting seat is located between the first bracket platform and the second bracket platform; A closing lever, wherein the closing lever is mounted on the third lever mounting seat, and one end of the closing lever is rotatably connected to the lower end of the magnetic rod; A transmission push rod, the lower end of which is rotatably mounted on the other end of the closing lever, and the upper end of which is rotatably mounted on the linkage shaft.

3. The double-breakpoint DC circuit breaker according to claim 1, characterized in that: The active contact is made of silver alloy material.

4. The double-breakpoint DC circuit breaker according to claim 1, characterized in that: The arc moving contact and the two arc static contacts are both made of copper material.

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