A vehicle-mounted DC circuit breaker with indirect tripping function

Abstract

This invention discloses a vehicle-mounted DC circuit breaker with indirect tripping function, comprising a circuit breaker body, a closing device, a main circuit, an auxiliary circuit, and a direct tripping device electrically connected to the main circuit. The closing device includes a closing operating mechanism and a closing push rod. The circuit breaker body is equipped with an indirect tripping device, which includes an electromagnet, a power arm, a rotating shaft, an insulating coupling, and a flap. The output end of the electromagnet is provided with a power arm clamp adapted to the power arm along its axial direction. The lower end of the power arm is rotatably connected to the power arm clamp, and the upper end of the power arm is connected to the rotating shaft. The rotating shaft is connected to the flap via the insulating coupling, and the flap is detachably connected to the closing push rod. The vehicle-mounted DC circuit breaker provided by this invention has an indirect tripping function, making it very suitable for the use of rail transit such as light rail, subway, and tram with limited space. Furthermore, this invention has the advantages of convenient disassembly and assembly, and easy maintenance.

Description

Technical Field

[0001] This invention relates to a vehicle-mounted DC circuit breaker with indirect tripping function, belonging to the technical field of vehicle-mounted DC circuit breakers. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and capable of closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. Circuit breakers are divided into DC circuit breakers and AC circuit breakers. DC circuit breakers are widely used in fields such as ships, rail transit, and electric locomotives. For example, on-board DC circuit breakers are widely used in the traction systems of light rail, subways, and trams.

[0003] Existing vehicle-mounted DC circuit breakers typically include a closing device, a main circuit, an auxiliary circuit, and a tripping device. In use, the closing device drives the main circuit and auxiliary circuit to achieve the opening and closing operations, and the tripping device can trip and trip when an overcurrent occurs in the main circuit.

[0004] Tripping devices are generally divided into direct tripping devices and indirect tripping devices. Currently, the tripping devices used in vehicle-mounted DC circuit breakers are usually electromagnetic direct tripping devices. Since this type of direct tripping device achieves current protection by matching the magnitude of the electromagnetic force generated by the iron core and coil with the spring force of the iron core, it has disadvantages such as large size, poor precision, and the tendency for the spring force value to decay due to the temperature rise of the circuit breaker. Therefore, in order to achieve the function of fast tripping, the traction systems of rail transit such as light rail, subway and tram usually need to be equipped with indirect tripping devices to meet the tripping function of vehicle-mounted DC circuit breakers.

[0005] Existing indirect tripping devices mainly include latching type (see patent CN201310065245.8 for latching device of circuit breaker), gear type (see patent CN202022571188.9 for opening and closing device of intelligent circuit breaker), and screw or linkage type (see patent CN201711119599.0 for tripping device and residual current circuit breaker for residual current circuit breaker). However, these indirect tripping devices all have problems such as complex structure, large space occupation, and inability to be directly installed on vehicle-mounted DC circuit breakers. As a result, currently, only corresponding external linkage interfaces can be provided for vehicle-mounted DC circuit breakers to connect with external indirect tripping devices to realize the indirect tripping function of vehicle-mounted DC circuit breakers. This not only occupies a lot of limited space in the vehicle, but also has defects such as insensitive opening and closing speed and the installation position can easily affect the reliability of operation, which cannot well meet the application requirements of vehicle-mounted DC circuit breakers. Summary of the Invention

[0006] To address the aforementioned problems in the existing technology, the purpose of this invention is to provide a vehicle-mounted DC circuit breaker with indirect tripping function.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A vehicle-mounted DC circuit breaker with indirect tripping function includes a circuit breaker body. The circuit breaker body includes a closing device, a main circuit, an auxiliary circuit, and a direct tripping device electrically connected to the main circuit. The closing device includes a closing operating mechanism and a closing push rod. The main circuit includes a stationary contact and a moving contact. The moving contact is connected to a pull rod, and the pull rod is connected to a opening spring. The auxiliary circuit includes an auxiliary contact. The closing push rod is connected to the closing operating mechanism and the moving contact respectively, and the opening spring is connected to the auxiliary contact. The circuit breaker is characterized in that:

[0009] The circuit breaker body is equipped with an indirect tripping device, which includes an electromagnet, a power arm, a rotating shaft, an insulating coupling, and a flap. The output end of the electromagnet is provided with a power arm clamp adapted to the power arm along its axial direction. The lower end of the power arm is rotatably connected to the power arm clamp, and the upper end of the power arm is connected to the rotating shaft. The rotating shaft is connected to the flap via an insulating coupling. The flap is detachably connected to the closing push rod, that is: when the electromagnet is not energized, the flap can be separated from the closing push rod; when the electromagnet is energized, the flap can contact the closing push rod.

[0010] In one embodiment, the circuit breaker body is further provided with a microprocessor unit, a communication interface module, and a capacitor energy storage module. The microprocessor unit is electrically connected to the main circuit. The communication interface module is connected to the microprocessor unit and the capacitor energy storage module respectively via cables. The output terminal of the capacitor energy storage module is connected to the electromagnet of the indirect tripping device via a tripping output wire.

[0011] In one embodiment, the circuit breaker body further includes a left side plate, a right side plate, a closing mechanism cover plate, and a busbar support plate. The indirect tripping device is installed on the right side plate, the microprocessor unit is fixed on the busbar support plate, the communication interface module is installed on the left side plate, and the capacitor energy storage module is fixed on the closing mechanism cover plate.

[0012] In a preferred embodiment, the indirect tripping device further includes a mounting bracket disposed on the circuit breaker body, the power arm clamp passing through the mounting bracket and connected to the lower end of the power arm, and the rotating shaft passing through the mounting bracket and connected to the upper end of the power arm.

[0013] In a preferred embodiment, the microprocessor unit includes a Hall current sensor and a digital relay protection device, wherein the digital relay protection device is connected to the Hall current sensor via a cable, and the Hall current sensor is electrically connected to the main circuit.

[0014] In a preferred embodiment, the microprocessor unit further includes a control MCU and a communication processor. The control MCU is connected to the digital relay protection device and the communication processor respectively via cables, and the communication processor is connected to the communication interface module via a cable.

[0015] In a preferred embodiment, the operating power for both the microprocessor unit and the capacitor energy storage module comes from the communication interface module.

[0016] In a preferred embodiment, the communication interface module includes a power interface, a signal interface, and a communication interface.

[0017] In a preferred embodiment, the cable connecting the communication interface module and the microprocessor unit includes an action contact signal line, an indicator light signal line, a fast trip signal line, and an Ethernet connection line.

[0018] In a preferred embodiment, the capacitor energy storage module includes an energy storage capacitor, a charging control circuit, a trigger discharge circuit, and a power failure protection circuit. The charging control circuit, the trigger discharge circuit, and the power failure protection circuit are all connected to the energy storage capacitor via cables. The energy storage capacitor is connected to the electromagnet of an indirect tripping device, and the trigger discharge circuit is connected to a communication interface module.

[0019] In a preferred embodiment, the cable connecting the capacitor energy storage module and the communication interface module includes a fast trip signal line and a capacitor charging status signal line.

[0020] In a preferred embodiment, the vehicle-mounted DC circuit breaker with indirect tripping function is further provided with an external cable protection cover and an internal cable protection cover.

[0021] In one embodiment, the insulated coupling includes a connector A, a connector B, and an intermediate connecting piece disposed between connector A and connector B. Connecting shaft sleeve A and connecting shaft sleeve B are respectively provided in the middle portion of the side of connector A and connector B away from the intermediate connecting piece. Connecting pin A and connecting pin B are respectively provided at both ends of the side of connector A and connector B facing the intermediate connecting piece. Metal adapter A connected to the rotating shaft and metal adapter B connected to the flap are respectively axially provided inside connecting shaft sleeve A and connecting shaft sleeve B. The intermediate connecting piece has four symmetrical notches arranged in a cross shape. Connecting pin A and connecting pin B can be respectively engaged into the corresponding notches and can be interference-fitted with the notches. The central axes of connecting shaft sleeve A and connecting shaft sleeve B coincide. Furthermore, the parts of connector A (excluding metal adapter A), the parts of connector B (excluding metal adapter B), and the intermediate connecting piece are all made of insulating material.

[0022] In a preferred embodiment, the notch is a U-shaped notch.

[0023] In a preferred embodiment, both connecting pin A and connecting pin B are cylindrical pins with limiting ends.

[0024] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0025] Because the vehicle-mounted DC circuit breaker provided by the present invention is equipped with an indirect tripping device, the vehicle-mounted DC circuit breaker itself has an indirect tripping function, and can quickly cut off the fault current without the need for an external linkage interface. It is very suitable for the use requirements of rail transit such as light rail, subway and tram with limited space. In addition, the present invention also has the advantages of convenient disassembly and assembly and easy maintenance, and has obvious practical value. Attached Figure Description

[0026] Figure 1 The diagram shown is a structural schematic of a vehicle-mounted DC circuit breaker with indirect tripping function provided in an embodiment of the present invention.

[0027] Figure 2 The diagram shown is a schematic representation of the vehicle-mounted DC circuit breaker with indirect tripping function provided in an embodiment of the present invention from another perspective.

[0028] Figure 3 The diagram shown is a schematic diagram of the connection structure between the closing device and the main circuit, auxiliary circuit and direct tripping device in an embodiment of the present invention.

[0029] Figure 4 What is shown is Figure 3 A schematic diagram of the structure after removing the heat sink and stationary contact assembly board;

[0030] Figure 5 The diagram shown is a schematic diagram of the connection structure between the microprocessor unit, the communication interface module, the capacitor energy storage module, and the indirect tripping device described in an embodiment of the present invention.

[0031] Figure 6 What is shown is Figure 5 A schematic diagram of the structure after installing external and internal cable protection covers;

[0032] Figure 7 The diagram shown is a schematic representation of the logical relationship between the microprocessor unit, the communication interface module, the capacitor energy storage module, and the indirect tripping device described in this embodiment of the invention.

[0033] Figure 8 The diagram shown is a schematic block diagram of the microprocessor unit described in an embodiment of the present invention.

[0034] Figure 9 The diagram shown is a schematic block diagram of the communication interface module described in an embodiment of the present invention.

[0035] Figure 10 The diagram shown is a schematic block diagram of the capacitor energy storage module described in an embodiment of the present invention.

[0036] Figure 11 The diagram shown is a structural schematic of the indirect tripping device described in an embodiment of the present invention;

[0037] Figure 12 The diagram shown is a schematic representation of the indirect tripping device described in this embodiment of the invention after the mounting bracket has been removed.

[0038] Figure 13 The diagram shown is a schematic representation of the positional relationship between the indirect tripping device and the closing push rod in an embodiment of the present invention.

[0039] Figure 14 The figure shown is a structural schematic diagram of the insulating coupling described in an embodiment of the present invention;

[0040] Figure 15 The diagram shown is an exploded view of the insulated coupling described in an embodiment of the present invention.

[0041] Figure 16 The figure shown is a structural schematic diagram of connector A according to an embodiment of the present invention;

[0042] Figure 17 The diagram shown is a structural schematic of connector B according to an embodiment of the present invention;

[0043] Figure 18 The diagram shown is a structural schematic of the intermediate connecting piece described in an embodiment of the present invention;

[0044] The following labels are used to indicate the components in the diagram: 1. Circuit breaker body; 11. Closing device; 111. Closing operating mechanism; 112. Closing push rod; 113. Closing mechanism housing; 114. Closing mechanism cover plate; 12. Main circuit; 121. Stationary contact; 122. Moving contact; 123. Pull rod; 124. Opening spring; 125. Busbar support plate; 126. Lower busbar; 127. Gantry frame; 128. Moving contact arc eliminator; 129. Stationary contact arc eliminator; 1210. Stationary contact assembly plate; 1211. Radiator; 13. Auxiliary circuit; 131. Auxiliary contact; 14. Direct tripping device; 15. Arc extinguishing chamber assembly; 16. Mounting plate; 161. Left side plate; 162. Right side plate; 163. Base plate;

[0045] 2. Indirect tripping device; 21. Electromagnet; 22. Power arm; 23. Rotating shaft; 24. Insulating coupling; 241. Connecting part A; 2411. Connecting bushing part A; 2412. Connecting pin part A; 2413. Metal adapter A; 2414. Reinforcing rib A; 242. Connecting part B; 2421. Connecting bushing part B; 2422. Connecting pin part B; 2423. Metal adapter B; 2424. Reinforcing rib B; 243. Intermediate connecting piece; 2431. Notch; 25. Flip plate; 26. Power arm clamp; 27. Mounting bracket;

[0046] 3. Microprocessor unit; 31. Hall current sensor; 32. Digital relay protection device; 33. Control MCU; 34. Communication processor;

[0047] 4. Communication interface module; 41. Power interface; 42. Signal interface; 43. Communication interface;

[0048] 5. Capacitor energy storage module; 51. Energy storage capacitor; 52. Charging control circuit; 53. Trigger discharge circuit; 54. Power failure protection circuit;

[0049] 6. External cable protection cover; 7. Internal cable protection cover. Detailed Implementation

[0050] The technical solution of the present invention will be further described clearly and completely below with reference to the accompanying drawings and embodiments.

[0051] Example

[0052] Please see Figure 1 , Figure 3 and Figure 4 As shown: This embodiment provides a vehicle-mounted DC circuit breaker with indirect tripping function, including a circuit breaker body 1. The circuit breaker body 1 includes a closing device 11, a main circuit 12, an auxiliary circuit 13, and a direct tripping device 14 electrically connected to the main circuit 12. The closing device 11 includes a closing operating mechanism 111 and a closing push rod 112. The main circuit 12 includes a stationary contact 121 and a moving contact 122. The moving contact 122 is connected to a pull rod 123, and the pull rod 123 is connected to a opening spring 124. The auxiliary circuit 13 includes an auxiliary contact 131. The closing push rod 112 is connected to the closing operating mechanism 111 and the moving contact 122 respectively. The opening spring 124 is connected to the auxiliary contact 131. The circuit breaker body 1 is provided with an indirect tripping device 2.

[0053] Please refer to the following: Figures 11 to 13As shown, the indirect tripping device 2 includes an electromagnet 21, a power arm 22, a rotating shaft 23, an insulating coupling 24, and a flap 25. The output end of the electromagnet 21 is provided with a power arm chuck 26 adapted to the power arm 22 along its axial direction. The lower end of the power arm 22 is rotatably connected to the power arm chuck 26, and the upper end of the power arm 22 is connected to the rotating shaft 23. The rotating shaft 23 is connected to the flap 25 through the insulating coupling 24. The flap 25 is detachably connected to the closing push rod 112, that is: when the electromagnet 21 is not energized, the flap 25 can be separated from the closing push rod 112; when the electromagnet 21 is energized, the flap 25 can contact the closing push rod 112.

[0054] The working principle of the vehicle-mounted DC circuit breaker with indirect tripping function described in this invention is as follows:

[0055] 1) The opening and closing operations are achieved by driving the main circuit 12 and auxiliary circuit 13 through the closing device 11. Please also consider... Figure 3 and Figure 4 As shown, specifically:

[0056] Closing: Apply a closing pulse current to the coil in the closing operation mechanism 111 (this part is common knowledge). The closing operation mechanism 111 pushes the closing push rod 112, which in turn pushes the moving contact 122 until the moving contact 122 closes with the stationary contact 121. At the same time, the auxiliary contact 131 is driven to move through the pull rod 123 connected to the moving contact 122.

[0057] Opening: When the coil current in the closing operation mechanism 111 is cut off, the closing push rod 112 returns, and the moving contact 122 returns to the opening position under the action of the opening spring 124 and the pull rod 123. At the same time, the auxiliary contact 131 is activated.

[0058] 2) Direct overcurrent tripping via direct tripping device 14. The circuit breaker body 1 has a preset tripping current threshold. When the current in the main circuit 12 reaches the threshold, the direct tripping device 14 operates, and the circuit breaker trips.

[0059] When the circuit breaker is in the closed state, the closing push rod 112 applies a pushing force to the moving contact 122, which can overcome the pulling force of the opening spring 124 on the moving contact 122, thereby keeping the moving contact 122 in the closed position;

[0060] When the current in the main circuit 12 reaches the trip current threshold, the direct trip device 14 applies a force to the closing push rod 112 to disengage the closing push rod 112 from the moving contact 122 (this part can be done using existing technology and is common knowledge). At this time, the moving contact 122 no longer bears the pushing force of the closing push rod 112, and can then return to the open position under the action of the opening spring 124.

[0061] 3) Indirect tripping via indirect tripping device 2, please combine with... Figures 11 to 13 As shown, specifically:

[0062] Non-operating state: When the current in the main circuit 12 is normal, the circuit breaker is in the closed state and no power is supplied to the electromagnet 21. The indirect tripping device 2 is in the non-operating state. The electromagnet 21 does not apply force to the power arm 22 through the power arm clamp 26. The power arm 22 is in a vertical state. The flap 25 is in a horizontal state and there is a gap between it and the closing push rod 112. That is, the flap 25 is separated from the closing push rod 112. The flap 25 does not apply force to the closing push rod 112. At this time, the indirect tripping device 2 has no effect on the closing push rod 112.

[0063] Operating state: When the current in the main circuit 12 is abnormal, the electromagnet 21 is energized, and the indirect tripping device 2 is in the operating state. The energized electromagnet 21 applies a force to the power arm 22 through the power arm clamp 26. The power arm 22 rotates under this force, and the rotation of the power arm 22 drives the rotating shaft 23 to rotate. The rotating shaft 23 drives the flap 25 to rotate through the insulating coupling 24. After the flap 25 rotates, it comes into contact with the closing push rod 112, thereby acting on the closing push rod 112. The closing push rod 112 rotates under the action of the flap 25 and then disengages from the moving contact 122. Then, the moving contact 122 quickly opens under the action of the opening spring 124, realizing the tripping trip.

[0064] Please combine Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, in this invention, the circuit breaker body 1 is further provided with a microprocessor unit 3, a communication interface module 4, and a capacitor energy storage module 5. The microprocessor unit 3 is electrically connected to the main circuit 12. The communication interface module 4 is connected to the microprocessor unit 3 and the capacitor energy storage module 5 respectively via cables. The output terminal of the capacitor energy storage module 5 is connected to the electromagnet 21 of the indirect tripping device 2 via a tripping output wire. The indirect tripping device 2, microprocessor unit 3, communication interface module 4, and capacitor energy storage module 5 together constitute an intelligent tripping device, enabling the circuit breaker to intelligently and automatically trip quickly, thus providing better protection for the circuit breaker. The microprocessor unit 3 can monitor the current in the main circuit 12 in real time. The communication interface module 4 is the external interface of the intelligent tripping device. The capacitor energy storage module 5 stores the electrical energy required for the indirect tripping device to operate. When the microprocessor unit 3 detects an abnormal current in the main circuit 12, it sends a protection action command to the capacitor energy storage module 5 through the communication interface module 4. Upon receiving the command, the capacitor energy storage module 5 releases the stored electrical energy to the electromagnet 21 of the indirect tripping device 2, activating the indirect tripping device 2 and achieving rapid tripping.

[0065] Please refer to the following: Figure 8 As shown, in this embodiment, the microprocessor unit 3 includes a Hall current sensor 31 and a digital relay protection device 32. The digital relay protection device 32 is connected to the Hall current sensor 31 via a cable. The Hall current sensor 31 is electrically connected to the main circuit 12 to monitor the current in the main circuit 12 in real time and transmits the measured current information to the digital relay protection device 32, which provides relay protection. This design enables the microprocessor unit 3 to have current protection / monitoring functions, thereby enabling the intelligent tripping device to have dual functions of relay protection and indirect tripping. Both the Hall current sensor 31 and the digital relay protection device 32 can be based on existing technologies.

[0066] In addition, the microprocessor unit 3 also includes a control MCU 33 and a communication processor 34. The control MCU 33 is connected to the digital relay protection device 32 and the communication processor 34 via cables, and the communication processor 34 is connected to the communication interface module 4 via a cable. The Hall current sensor 31 detects the current in the main circuit 12 in real time and transmits the measured current information to the digital relay protection device 32. The digital relay protection device 32 analyzes and processes the received current information. When the analysis result shows an abnormal current, the control MCU 33 sends a protection action command to the capacitor energy storage module 5 through the communication processor 34 and the communication interface module 4.

[0067] In a preferred embodiment, the current protection / monitoring function of the microprocessor unit 3 includes current rise rate (di / dt) protection / monitoring function, current increment (ΔI) protection / monitoring function, and instantaneous overcurrent (Imax) protection / monitoring function.

[0068] In this embodiment, the operating power of the microprocessor unit 3 and the capacitor energy storage module 5 both come from the communication interface module 4, and the operating current is integrated into the communication interface module 4, eliminating the need to provide separate operating power, which simplifies the device structure.

[0069] Please refer to the following: Figure 9 As shown, in this embodiment, the communication interface module 4 includes a power interface 41, a signal interface 42, and a communication interface 43. Specifically, the communication interface module 4 includes a panel with two electrical connectors. One connector serves as both the power interface 41 and the signal interface 42, while the other connector serves as the communication interface 43. The power interface 41 is used to connect to a power source, the signal interface 42 is used to connect to the capacitor energy storage module 5, and the communication interface 43 is used to connect to the microprocessor unit 3 (specifically, the communication processor 34 of the microprocessor unit 3). The communication interface can be a standard Ethernet interface.

[0070] The cable connecting the communication interface module 4 and the microprocessor unit 3 includes an action contact signal line, an indicator light signal line, a fast trip signal line, and an Ethernet connection line. The action contact signal line, indicator light signal line, and fast trip signal line are connected to the signal interface 42, and the Ethernet connection line is connected to the communication interface 43.

[0071] Please refer to the following: Figure 10 As shown, in this embodiment, the capacitor energy storage module 5 includes an energy storage capacitor 51, a charging control circuit 52, a trigger discharge circuit 53, and a power failure protection circuit 54. The charging control circuit 52, the trigger discharge circuit 53, and the power failure protection circuit 54 are all connected to the energy storage capacitor 51 via cables. The energy storage capacitor 51 is connected to the electromagnet 21 of the indirect tripping device 2, and the trigger discharge circuit 53 is connected to the communication interface module 4. Specifically, the charging control circuit 52 controls the charging of the energy storage capacitor 51, including charging to the operating voltage and maintaining the capacitor's float charge; the trigger discharge circuit 53 initiates rapid discharge of the energy storage capacitor 51 to the indirect tripping device 2 upon receiving a protection action signal from the microprocessor unit 3 via the communication interface module 4; and the power failure protection circuit 54 quickly dissipates the stored energy in the energy storage capacitor 51 through an internal resistor when the input power to the capacitor energy storage module 5 fails, to prevent electric shock.

[0072] The cable connecting the capacitor energy storage module 5 and the communication interface module 4 includes a fast trip signal line and a capacitor charging status signal line.

[0073] Please refer to the following: Figure 11 and Figure 13 As shown, in this invention, the indirect tripping device 2 further includes a mounting bracket 27 disposed on the circuit breaker body 1. The power arm clamp 26 passes through the mounting bracket 27 and is connected to the lower end of the power arm 22. The rotating shaft 23 passes through the mounting bracket 27 and is connected to the upper end of the power arm 22. This can enhance the connection stability between the electromagnet 21 and the power arm clamp 26, the power arm 22, and the rotating shaft 23.

[0074] Please refer to the following: Figures 14 to 18As shown, in this invention, the insulating coupling 24 includes a connector A 241, a connector B 242, and an intermediate connecting piece 243 disposed between the connector A 241 and the connector B 242. Connecting bushing A 2411 and connecting bushing B 242 are respectively provided in the middle portion of the side of the connector A 241 and the side of the connector B 242 away from the intermediate connecting piece 243. Connecting pin A 2412 and connecting pin B 2422 are respectively provided at both ends of the side of the connector A 241 and the side of the connector B 242 facing the intermediate connecting piece 243. Metal adapter A 2413, connected to the rotating shaft 23, and metal adapter B, connected to the flap 25, are respectively axially disposed within the connecting bushing A 2411 and the connecting bushing B 2421. 2423, The intermediate connecting piece 243 is symmetrically provided with four notches 2431, the four notches 2431 are arranged in a cross shape, the connecting pin A 2412 and the connecting pin B 2422 can be respectively inserted into the notches 2431 at the corresponding positions, and can be interference-fitted with the notches 2431. The central axes of the connecting bushing A 2412 and the connecting bushing B 2422 coincide. In addition, the parts of the connecting piece A 241 except for the metal adapter A 2413, the parts of the connecting piece B 242 except for the metal adapter B 2423, and the intermediate connecting piece 243 are all made of insulating material.

[0075] During assembly, the insulated coupling 24 only requires inserting the corresponding connecting pins A 2412 and B 2422 of connector A 241 and connector B 242 into their respective notches 2431. When connector A 241 rotates, torque is transmitted to connector B 242 via the intermediate connecting piece 243. Since the connecting pins A 2412 and B 2422 of connector A 241 and connector B 242 can move freely within the notches 2431 of the intermediate connecting piece 243, the misalignment of the two rotating shafts can be compensated, thereby reducing assembly difficulty and improving operational reliability. Furthermore, the insulated coupling 24 has a simple structure, requires no fasteners for assembly, and is easy to assemble and maintain. In addition, because the parts of connector A 241 other than the metal adapter A2413 and connector B 242 other than the metal adapter B2412 are all incompatible, the coupling can be easily assembled and maintained. All parts except 2423 and intermediate connecting piece 243 are made of insulating material, which enables the air gap and creepage distance of the insulating coupling 24 to meet the electrical insulation strength requirements in GB / T 21413.1, with an electrical gap > 22mm and an impulse voltage rating of over 18kV. It has excellent electrical insulation level and can fully meet the application requirements of electrical equipment.

[0076] In this embodiment, the notch 2431 is preferably a U-shaped notch, which facilitates the free movement of connecting pin A 2412 and connecting pin B 2422 within the notch 2431.

[0077] Furthermore, both connecting pin A 2412 and connecting pin B 2422 are preferably cylindrical pins with limiting ends, which can enhance the connection stability between connector A 241 and connector B 242 and intermediate connecting piece 243.

[0078] As a preferred embodiment, both sides of the connecting bushing A 2411 and the connecting bushing B 2421 are provided with reinforcing ribs A 2414 and B 2424 respectively to provide reinforcement.

[0079] Please refer to the following: Figure 6 As shown in this embodiment, the vehicle-mounted DC circuit breaker with indirect tripping function is also provided with an external cable protection cover 6 and an internal cable protection cover 7 to protect the internal and external cables and prevent the cables from being damaged by insulation breakdown and mechanical damage.

[0080] Please refer to the following: Figures 1 to 4 As shown, the circuit breaker body 1 also includes an arc-extinguishing chamber assembly 15 and a mounting plate 16 disposed below the arc-extinguishing chamber assembly 15. The mounting plate 16 includes a left side plate 161, a right side plate 162, and a bottom plate 163. The closing device 11, the main circuit 12, the auxiliary circuit 13, and the direct tripping device 14 are all installed inside the mounting plate 16. In the closing device 11, the closing operation mechanism 111 is provided with a closing mechanism housing 113 outside, and a closing mechanism cover plate 114 is provided on the outside of the closing mechanism housing 113. The main circuit 12 includes vertically arranged... The busbar support plate 125 has a lower busbar 126 and an upper busbar containing a stationary contact 121 respectively at its lower and upper parts. In addition, the main circuit 12 also includes a portal frame 127 located outside the moving contact 122 and connected to the moving contact 122. The top of the portal frame 127 is connected to the moving contact arc-guiding strip 128, and the top of the upper busbar is connected to the stationary contact arc-guiding strip 129. The top of the portal frame 127 and the busbar support plate 125 are provided with a stationary contact assembly plate 1210, and the lower outer side of the moving contact 122 is provided with a radiator 1211.

[0081] The indirect tripping device 2 is installed on the right side plate 162. The flap 25 of the indirect tripping device 2 passes through the right side plate 162 and is detachably connected to the closing push rod 112 of the closing operation mechanism 111. The microprocessor unit 3 is fixed on the busbar support plate 125 (and the lower busbar 126 on the busbar support plate 125 passes through the Hall current sensor 31 in the microprocessor unit 3). The communication interface module 4 is installed on the left side plate 161. The capacitor energy storage module 5 is fixed on the closing mechanism cover plate 114. Thus, a vehicle-mounted DC circuit breaker with indirect tripping function is formed, possessing advantages such as compact structure, small footprint, complete functions, and high level of intelligence.

[0082] Finally, it should be pointed out that the above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A vehicle-mounted DC circuit breaker with indirect tripping function, comprising a circuit breaker body, the circuit breaker body including a closing device, a main circuit, an auxiliary circuit, and a direct tripping device electrically connected to the main circuit, the closing device including a closing operating mechanism and a closing push rod, the main circuit including a stationary contact and a moving contact, the moving contact being connected to a pull rod, the pull rod being connected to a opening spring, the auxiliary circuit including an auxiliary contact, the closing push rod being connected to the closing operating mechanism and the moving contact respectively, and the opening spring being connected to the auxiliary contact; characterized in that: The circuit breaker body is equipped with an indirect tripping device, which includes an electromagnet, a power arm, a rotating shaft, an insulating coupling, and a flap. The output end of the electromagnet is provided with a power arm clamp adapted to the power arm along its axial direction. The lower end of the power arm is rotatably connected to the power arm clamp, and the upper end of the power arm is connected to the rotating shaft. The rotating shaft is connected to the flap via an insulating coupling. The flap is detachably connected to the closing push rod, that is: when the electromagnet is not energized, the flap can be separated from the closing push rod; when the electromagnet is energized, the flap can contact the closing push rod.

2. The vehicle-mounted DC circuit breaker with indirect tripping function according to claim 1, characterized in that: The circuit breaker body is also equipped with a microprocessor unit, a communication interface module and a capacitor energy storage module. The microprocessor unit is electrically connected to the main circuit. The communication interface module is connected to the microprocessor unit and the capacitor energy storage module respectively through cables. The output terminal of the capacitor energy storage module is connected to the electromagnet of the indirect tripping device through a trip output wire.

3. The vehicle-mounted DC circuit breaker with indirect tripping function according to claim 2, characterized in that: The circuit breaker body also includes a left side plate, a right side plate, a closing mechanism cover plate, and a busbar support plate. The indirect tripping device is installed on the right side plate, the microprocessor unit is fixed on the busbar support plate, the communication interface module is installed on the left side plate, and the capacitor energy storage module is fixed on the closing mechanism cover plate.

4. The vehicle-mounted DC circuit breaker with indirect tripping function according to claim 2, characterized in that: The microprocessor unit includes a Hall current sensor and a digital relay protection device. The digital relay protection device is connected to the Hall current sensor via a cable, and the Hall current sensor is electrically connected to the main circuit.

5. The vehicle-mounted DC circuit breaker with indirect tripping function according to claim 4, characterized in that: The microprocessor unit also includes a control MCU and a communication processor. The control MCU is connected to the digital relay protection device and the communication processor respectively via cables, and the communication processor is connected to the communication interface module via cables.

6. The vehicle-mounted DC circuit breaker with indirect tripping function according to claim 2, characterized in that: The microprocessor unit and the capacitor energy storage module are both powered by the communication interface module.

7. The vehicle-mounted DC circuit breaker with indirect tripping function according to claim 2, characterized in that: The communication interface module includes a power interface, a signal interface, and a communication interface.

8. The vehicle-mounted DC circuit breaker with indirect tripping function according to claim 2, characterized in that: The capacitor energy storage module includes an energy storage capacitor, a charging control circuit, a trigger discharge circuit, and a power failure protection circuit. The charging control circuit, the trigger discharge circuit, and the power failure protection circuit are all connected to the energy storage capacitor via cables. The energy storage capacitor is connected to the electromagnet of the indirect tripping device. The trigger discharge circuit is connected to the communication interface module.

9. The vehicle-mounted DC circuit breaker with indirect tripping function according to claim 1, characterized in that: The indirect tripping device also includes a mounting bracket on the circuit breaker body, the power arm clamp passes through the mounting bracket and is connected to the lower end of the power arm, and the rotating shaft passes through the mounting bracket and is connected to the upper end of the power arm.

10. The vehicle-mounted DC circuit breaker with indirect tripping function according to claim 1, characterized in that: The insulated coupling includes a connector A, a connector B, and an intermediate connecting piece between connector A and connector B. Connecting sleeve A and connecting sleeve B are respectively provided in the middle of the side of connector A and connector B away from the intermediate connecting piece. Connecting pin A and connecting pin B are respectively provided at both ends of the side of connector A and connector B facing the intermediate connecting piece. Metal adapter A connected to the rotating shaft and metal adapter B connected to the flap are respectively provided axially within connecting sleeve A and connecting sleeve B. The intermediate connecting piece has four symmetrical notches arranged in a cross shape. Connecting pin A and connecting pin B can be inserted into the corresponding notches and can be press-fitted with the notches. The central axes of connecting sleeve A and connecting sleeve B coincide. All parts of connector A except for metal adapter A, all parts of connector B except for metal adapter B, and the intermediate connecting piece are made of insulating material.

Images