Direct current circuit breaker with short time delay function

Abstract

The application relates to a short-circuit short-delay signal triggering device, in particular discloses a direct-current circuit breaker with a short-delay function, which comprises a base, a magnetic tripping system and a triggering device, the magnetic tripping system comprises a current-carrying conductor, a magnetic yoke, a spring, an armature and an armature support, the triggering device comprises a micro switch, the base is provided with phase interval plates, the micro switch is fixed on the phase interval plates, the armature is provided with a trigger rod, and the trigger rod can drive the micro switch to be turned on or turned off by rotating with the armature. By adopting the above structure, the direct-current circuit breaker with the short-delay function is compact in structure, small in size and capable of accurately and reliably sending a triggering signal.

Description

Technical Field

[0001] This invention relates to a short-circuit short-delay signal triggering device, and more particularly to a DC circuit breaker with a short-delay function. Background Technology

[0002] In order to ensure the continuity of power supply, reliably isolate faults, and minimize the scope of power outages, low-voltage power distribution systems often select low-voltage power distribution products with selective protection to achieve selective protection of power supply lines.

[0003] Selective protection refers to the coordinated operation of two or more protective devices. When a short circuit, ground fault, or other overcurrent occurs within a specified range, the designated device within that range will operate to isolate the fault, while devices outside that range will not operate. In other words, when a fault occurs at a point in a low-voltage power distribution system, the protective electrical systems on that line will selectively disconnect the fault according to a pre-defined sequence of actions; bypassing this sequence is strictly prohibited.

[0004] There are two forms of selective protection for molded case circuit breakers: electromagnetic and electronic. The electronic type is widely used due to its low cost, short development cycle, ability to be directly designed and developed on existing product platforms, and reliable operation. The electronic type works by using a short-circuit short-delay signal triggering device to provide a short-circuit short-delay signal to a short-delay electronic circuit board. The electronic circuit board performs the short delay and outputs a trip signal to the shunt trip unit, which then drives the circuit breaker to trip.

[0005] Currently, all electronic molded case circuit breakers with selective protection on the market are developed based on existing molded case circuit breakers. However, the implementation methods for a key component—the electronic short-circuit short-delay signal triggering device—varie from manufacturer to manufacturer. A common implementation method is to have the initial state as normally open, such as Chinese Patent Application No. 201120364278.9, which discloses a short-circuit short-delay protection device for a circuit breaker, including a bracket, a micro switch, a trigger rod, a bent armature, a conductive busbar, a magnetic yoke, a spring, a control circuit board, a shunt trip unit, and an armature bracket. The bracket is fixed to the base of the circuit breaker; the micro switch is fixed to the upper end of the bracket and connected to the control circuit board; the control circuit board is connected to the shunt trip unit; the shunt trip unit is connected to the circuit breaker; the upper end of the armature bracket has a positioning groove, the upper end of the armature is fixed to the trigger rod, and the lower end is placed in the positioning groove; one end of the spring is fixed to the armature bracket, and the other end is fixed to the upper end of the armature; the magnetic yoke is fixed to the armature bracket and connected to the conductive busbar.

[0006] The aforementioned bracket is a single part with many components, occupying a large space, which is not conducive to the development of miniaturized circuit breakers. Furthermore, its structure is triggered by striking a micro switch to close the circuit, but the bounce at the moment of closing causes a short delay error. The structure is complex and inconvenient to install. Summary of the Invention

[0007] To overcome the shortcomings of the prior art, the present invention provides a DC circuit breaker with a short delay function that is compact in structure, small in size, and ensures that the triggering device accurately and reliably issues trigger signals.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is: a DC circuit breaker with short-delay function, comprising a base, a magnetic tripping system, and a triggering device. The magnetic tripping system includes a current-carrying conductor, a magnetic yoke, a spring, an armature, and an armature support. The triggering device includes a micro switch. A phase spacer is provided on the base, and the micro switch is fixed on the phase spacer. A trigger rod is provided on the armature, and the trigger rod can drive the micro switch to turn on or off as the armature rotates.

[0009] In the above technical solution, the phase spacer is fastened to the base of the circuit breaker or the phase spacer is part of the circuit breaker base, i.e., integrally set. The phase spacer is not only used to fix the triggering device, but also serves as the phase spacer of the circuit breaker, used to isolate the arc between adjacent phases. The triggering device is fastened to the phase spacer, and the magnetic tripping system is fastened to the base of the circuit breaker. Under the action of the spring, the armature causes the trigger rod to abut against the contact of the micro switch. When the main circuit current value reaches the short-delay action value, the magnetic tripping system generates a pull action, the micro switch opens, and a trigger signal is transmitted to the control unit. After a short delay, the control module triggers the trip unit to open the circuit breaker.

[0010] As a further feature of the present invention, the phase spacer is provided with a positioning shaft and a fastening hole, the micro switch is provided with a positioning hole adapted to the positioning shaft and a connecting hole that can be aligned with the fastening hole, and fasteners are inserted through the fastening hole and the connecting hole.

[0011] In the above technical solution, during installation, the positioning shaft passes through the positioning hole of the micro switch, and the fasteners include a screw and a nut. The screw passes through the connecting hole and the fastening hole in sequence, and then is locked with the nut.

[0012] As a further feature of the present invention, the fastening hole is an elongated arc-shaped hole that rotates about the positioning shaft axis.

[0013] In the above technical solution, the preferred fastening hole can be a round hole or an elongated arc-shaped hole that rotates around the positioning shaft. The assembly method is the same as described above. The elongated arc-shaped hole can adjust the position of the micro switch fixed on the phase spacer, adjust the matching position of the micro switch and the magnetic tripping system, and avoid factors such as part deformation affecting the matching between the triggering device and the magnetic tripping system.

[0014] As a further feature of the present invention, the phase spacer plate is provided with two fastening holes, the micro switch is provided with a connection hole corresponding to the two fastening holes, and fasteners are inserted through the fastening holes and the connection holes.

[0015] In the above technical solution, during installation, the screw passes through a set of connecting holes and fastening holes in sequence, and then is tightened with a nut, making the connection convenient and stable.

[0016] As a further feature of the invention, one of the fastening holes is an elongated arc-shaped hole that rotates about the center of the other fastening hole.

[0017] In the above technical solution, one of the preferred fastening holes is a round hole, and the other fastening hole is an elongated arc hole. The elongated arc hole rotates around the center of the round hole. The assembly method is the same as described above. The elongated arc hole can adjust the position of the micro switch fixed on the phase spacer, adjust the matching position of the micro switch and the magnetic tripping system, and avoid the factors such as part deformation affecting the matching of the triggering device and the magnetic tripping system.

[0018] As a further feature of the present invention, a cable management block is provided on the phase spacer plate, one end of the cable management block is fixed on the phase spacer plate, and the other end is hook-shaped and fits with the phase spacer plate to form a cable management groove.

[0019] In the above technical solution, the micro switch transmission wire is soldered to the soldering pin of the micro switch, and the wire passes through the wire management groove to organize the wire and avoid disorderly placement of the wire inside the circuit breaker cavity.

[0020] As a further feature of the present invention, the phase spacer is a PCB board, the phase spacer includes a phase interlocking plate and a positioning plate for mounting the micro switch, and interlocking blocks and slots are provided between the phase interlocking plate and the positioning plate, and mutually compatible soldering points are provided between the interlocking blocks and slots, and the micro switch is fixedly inserted into the positioning plate by soldering feet.

[0021] In the above technical solution, the slot is set on the phase-to-phase plug plate. The side of the slot has a first welding point, and the plug block has a second welding point. During installation, the plug block passes through the slot, and the phase-to-phase plug plate is welded to the first and second welding points on the positioning plate one by one. After the plug block passes through the slot and is welded, a tight fit is formed to ensure phase-to-phase insulation protection. The phase-to-phase plug plate and the positioning plate are fitted at a fixed angle. The welding pin of the micro switch passes through the hole welding point on the positioning plate and is welded to the positioning plate. The positioning plate is wired from the two welding points of the micro switch. The wire extends to near the circuit breaker base, and the wiring terminal has two welding points. The wire is welded to the welding point where the wiring is interrupted. The PCBA wiring replaces the wires in the cavity, avoiding the process of tidying up the wires in the circuit breaker cavity.

[0022] As a further feature of the present invention, a fixing plate is provided on the interphase insert plate, and protrusions and insertion holes are provided between the fixing plate and the interphase insert plate for mutual insertion. Mutually compatible welding points are provided between the protrusions and insertion holes. A through hole is provided on the fixing plate, and the interphase insert plate is connected to the base through the fixing plate.

[0023] In the above technical solution, the socket is set on the phase-to-phase plate, and a third welding point is provided on the side of the socket. A fourth welding point is provided on the protrusion. During installation, the protrusion passes through the socket and welds the phase-to-phase plate to the third and fourth welding points on the fixing plate one by one. After the protrusion passes through the socket and is welded, a tight fit is formed, so that the fixing plate and the phase-to-phase plate are fixedly connected. Preferably, the base is provided with a boss with threaded fasteners. The phase-to-phase plate is inserted into the corresponding groove on the base. After the phase-to-phase plate is assembled in place, the lower surface of the fixing plate just contacts the boss. Select a suitable fastener to secure the entire phase-to-phase plate to the circuit breaker base.

[0024] As a further feature of the present invention, the micro switch is arranged vertically or at an angle relative to the bottom surface of the base. When the armature rotates under the action of short-circuit current, it drives the trigger rod to rotate synchronously, causing the trigger rod to disengage from the contact of the micro switch.

[0025] In the above technical solution, the micro switch is in a normally closed state during use. When the armature rotates under the action of a short-circuit current, the trigger rod rotates synchronously with the armature, causing the trigger rod to disengage from the contact of the micro switch and output a short-circuit short-delay trigger signal. This triggering method adopts a normally closed release mode, which avoids the error caused by bouncing when closing compared with the normally open closing mode, greatly improving the reliability of triggering and the accuracy of delay. At the same time, it maintains the existing 10In action characteristics unchanged, does not require rematching the spring, is easy to adjust, and greatly shortens the research and development cycle.

[0026] As a further feature of the present invention, the phase spacer is fastened to the base or integrally formed therefrom.

[0027] In the above technical solution, when the phase partition plate is fastened to the base, the phase partition plate is provided with a threaded fastening hole with an insert. After the phase partition plate is inserted into the corresponding groove on the base, it is connected to the base through the threaded fastening hole. The structure is simple and the connection is convenient.

[0028] The present invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0029] Appendix Figure 1 This is a diagram illustrating the internal structure of a specific embodiment of the present invention;

[0030] Appendix Figure 2 This is an exploded view of the phase spacer in a specific embodiment of the present invention;

[0031] Appendix Figure 3 This is an exploded view of the phase spacer in a specific embodiment of the present invention;

[0032] Appendix Figure 4 This is a schematic diagram of the installation of the phase spacer in a specific embodiment of the present invention;

[0033] Appendix Figure 5 This is an exploded view of the three-phase spacer structure according to a specific embodiment of the present invention;

[0034] Appendix Figure 6 This is an exploded view of the structure of the four-phase spacer in a specific embodiment of the present invention;

[0035] Appendix Figure 7 This is an exploded view of the structure of the five-phase spacer in a specific embodiment of the present invention;

[0036] Appendix Figure 8 This is an exploded view of the structure of the five-phase spacer in a specific embodiment of the present invention;

[0037] Appendix Figure 9 This is an exploded view of the structure of the five-phase spacer in a specific embodiment of the present invention;

[0038] Appendix Figure 10 This is a schematic diagram of the installation of the five-phase spacer in a specific embodiment of the present invention. Detailed Implementation

[0039] Specific embodiments of the present invention, for example Figure 1-10As shown, a DC circuit breaker with short-delay function includes a base 1, a magnetic tripping system 2, and a triggering device. The magnetic tripping system 2 includes a current-carrying conductor, a magnetic yoke, a spring, an armature, and an armature support. The triggering device includes a micro switch 3. A phase spacer 11 is provided on the base 1, and the micro switch 3 is fixed on the phase spacer 11. A trigger rod 21 is provided on the armature. The trigger rod 21 can drive the micro switch 3 to turn on or off as the armature rotates. The phase spacer 11 is fastened to the base 1 of the circuit breaker or is an integral part of the base 1 of the circuit breaker. The phase spacer 11 is not only used to fix the triggering device, but also serves as the phase spacer 11 of the circuit breaker to isolate the arc between adjacent phases. The triggering device is fastened to the phase spacer 11, and the magnetic tripping system 2 is fastened to the base 1 of the circuit breaker. Under the action of the spring, the armature causes the trigger rod 21 to abut against the contact of the micro switch 3. When the main circuit current value reaches the short delay action value, the magnetic tripping system 2 generates a pull action, the micro switch 3 opens, and a trigger signal is transmitted to the control unit. After a short delay, the control module triggers the trip unit to open the circuit breaker.

[0040] like Figure 2 , 3 As shown, the phase spacer 11 is provided with a positioning shaft 111 and a fastening hole 112. The micro switch 3 is provided with a positioning hole 31 adapted to the positioning shaft 111 and a connecting hole 32 that can be aligned with the fastening hole 112. Fasteners are inserted through the fastening hole 112 and the connecting hole 32. During installation, the positioning shaft 111 is inserted into the positioning hole 31 of the micro switch 3. The fasteners include a screw and a nut. The screw passes through the connecting hole 32 and the fastening hole 112 in sequence, and then is locked with the nut.

[0041] like Figure 3 As shown, the fastening hole 112 is an elongated arc-shaped hole that rotates around the positioning shaft 111. Preferably, the fastening hole 112 can be a round hole or an elongated arc-shaped hole that rotates around the positioning shaft 111. The assembly method is the same as described above. The elongated arc-shaped hole can adjust the position of the micro switch 3 fixed on the phase spacer 11 and adjust the mating position of the micro switch 3 and the magnetic release system 2, so as to avoid the factors such as component deformation affecting the mating of the trigger device and the magnetic release system 2.

[0042] like Figure 5 , 6 As shown, the phase spacer 11 has two fastening holes 112', and the micro switch 3 has connecting holes 32' that correspond one-to-one with the two fastening holes 112'. Fasteners are inserted through the fastening holes 112' and the connecting holes 32'. During installation, the screw passes through a set of connecting holes 32' and fastening holes 112' in sequence, and then is tightened with a nut, making the connection convenient and secure.

[0043] like Figure 6As shown, one of the fastening holes 112' is an elongated arc-shaped hole that rotates around the center of the other fastening hole 112'. Preferably, one of the fastening holes 112' is a circular hole, and the other fastening hole 112' is an elongated arc-shaped hole that rotates around the center of the circular hole. The assembly method is the same as described above. The elongated arc-shaped hole can adjust the position of the micro switch 3 fixed on the phase spacer 11, and adjust the mating position of the micro switch 3 and the magnetic tripping system 2, so as to avoid the influence of factors such as component deformation on the mating of the triggering device and the magnetic tripping system 2.

[0044] A cable management block 113 is provided on the aforementioned phase partition 11. One end of the cable management block 113 is fixed to the phase partition 11, and the other end is hook-shaped and fits with the phase partition 11 with a gap to form a cable management groove 1131. The transmission wire of the micro switch 3 is soldered to the soldering pin of the micro switch 3, and the wire passes through the cable management groove 1131 to organize the wire and prevent the wire from being placed disorderly inside the circuit breaker cavity.

[0045] like Figure 7-10 As shown, the phase spacer 11 is a PCB board. The phase spacer 11 includes a phase interlocking plate 114 and a positioning plate 115 for mounting the micro switch 3. A plug block 1151 and a slot 1141 are provided between the phase interlocking plate 114 and the positioning plate 115. A matching solder joint is provided between the plug block 1151 and the slot 1141. The micro switch 3 is fixedly inserted into the positioning plate 115 by soldering feet. Slot 1141 is set on the phase-to-phase plug plate 114. The side of slot 1141 is provided with a first welding point 1142, and the plug block 1151 is provided with a second welding point 1152. During installation, the plug block 1151 passes through slot 1141, and the phase-to-phase plug plate 114 and the first welding point 1142 and the second welding point 1152 on the positioning plate 115 are welded one-to-one. After the plug block 1151 passes through slot 1141 and is welded, a tight fit is formed to ensure phase-to-phase insulation protection. The phase-to-phase plug plate 114 and the positioning plate 115 are fitted at a fixed angle. The welding foot 34 of the micro switch 3 passes through the hole welding point on the positioning plate 115 and is welded to the positioning plate 115. The positioning plate 115 is wired from the two welding points of the micro switch 3. The wire extends to the circuit breaker base 1, and the wiring terminal is provided with two welding points. The wire is welded to the welding point where the wiring is interrupted. The PCBA wiring replaces the wire in the cavity, avoiding the process of tidying up the wire in the circuit breaker cavity.

[0046] A fixing plate 116 is provided on the aforementioned interphase insert plate 114. A protrusion 1161 and a socket 1143 are provided between the fixing plate 116 and the interphase insert plate 114 for mutual insertion. A matching welding point is provided between the protrusion 1161 and the socket 1143. A through hole 1163 is provided on the fixing plate 116. The interphase spacer 11 is connected to the base 1 through the fixing plate 116. The socket 1143 is provided on the phase-to-phase plate 114. The side of the socket 1143 is provided with a third welding point 1144, and the protrusion 1161 is provided with a fourth welding point 1162. During installation, the protrusion 1161 passes through the socket 1143 and welds the phase-to-phase plate 114 to the third welding point 1144 and the fourth welding point 1162 on the fixing plate 116 one by one. After the protrusion 1161 passes through the socket 1143 and is welded, a tight fit is formed, so that the fixing plate 116 and the phase-to-phase plate 114 are fixedly connected. Preferably, the base 1 is provided with a boss 12 with threaded fasteners. The phase-to-phase plate 114 is inserted into the corresponding groove on the base 1. After the phase-to-phase plate 114 is assembled in place, the lower surface of the fixing plate 116 just contacts the boss 12. Select the appropriate fastener to fix the phase-to-phase plate 11 as a whole on the circuit breaker base 1.

[0047] The aforementioned micro switch 3 is positioned vertically or at an angle relative to the bottom surface of the base 1. When the armature rotates under the action of a short-circuit current, it drives the trigger rod 21 to rotate synchronously, causing the trigger rod 21 to disengage from the contact of the micro switch 3. In use, the micro switch 3 is in a normally closed state. When the armature rotates under the action of a short-circuit current, the trigger rod 21 rotates synchronously with the armature, causing the trigger rod 21 to disengage from the contact of the micro switch 3, outputting a short-circuit short-delay trigger signal. This triggering method adopts a normally closed release mode, which, compared to the normally open closing mode, avoids errors caused by bouncing during closure, greatly improving the reliability of triggering and the accuracy of delay. At the same time, it maintains the existing 10In action characteristics without the need for rematching the spring, facilitating adjustment and greatly shortening the development cycle.

[0048] The aforementioned phase partition 11 is fastened to or integrally formed with the base 1. When the phase partition 11 is fastened to the base 1, the phase partition 11 is provided with a threaded fastening hole 117 with an insert. After the phase partition 11 is inserted into the corresponding groove on the base 1, it is connected to the base 1 through the threaded fastening hole 117. The structure is simple and the connection is convenient.

[0049] This invention is not limited to the specific embodiments described above. Those skilled in the art can implement this invention using various other specific embodiments based on the content disclosed herein. Any simple changes or modifications made to the design structure and concept of this invention fall within the protection scope of this invention.

Claims

1. A DC circuit breaker with short-time delay function, comprising a base, a magnetic tripping system, and a triggering device, wherein the magnetic tripping system comprises a current-carrying conductor, a magnetic yoke, a spring, an armature, and an armature support, characterized in that: The triggering device includes a micro switch. A phase spacer is provided on the base, and the micro switch is fixed on the phase spacer. A trigger rod is provided on the armature. The trigger rod rotates with the armature to drive the micro switch to turn on or off. The phase spacer is a PCB board, and includes a phase interlocking plate and a positioning plate for mounting the micro switch. Interlocking blocks and slots are provided between the phase interlocking plate and the positioning plate, and matching solder points are provided between the blocks and slots. The micro switch is fixedly inserted into the positioning plate by solder feet. A fixing plate is provided on the phase interlocking plate, and interlocking protrusions and holes are provided between the fixing plate and the phase interlocking plate. Matching solder points are provided between the protrusions and holes. A through hole is provided on the fixing plate, and the phase spacer is connected to the base through the fixing plate. The micro switch is set vertically or inclined relative to the bottom surface of the base. When the armature rotates under the action of a short-circuit current, it drives the trigger rod to rotate synchronously. The trigger rod is disengaged from the contact of the micro switch. The slot is set on the phase-to-phase plate. The side of the slot has a first welding point, and the plug has a second welding point. During installation, the plug passes through the slot, and the phase-to-phase plate is welded to the first and second welding points on the positioning plate one by one. After the plug passes through the slot and is welded, a tight fit is formed to ensure phase-to-phase insulation protection. The phase-to-phase plate and the positioning plate are fitted at a fixed angle. The welding feet of the micro switch pass through the perforated welding points on the positioning plate and are welded to the positioning plate. The positioning plate is wired from the two welding points of the micro switch. The wire extends to near the circuit breaker base, and the wire terminal has two welding points. The wire is welded to the welding point where the wire is interrupted. The socket is set on the phase-to-phase plate. The side of the socket has a third welding point, and the protrusion has a fourth welding point. During installation, the protrusion passes through the socket, and the phase-to-phase plate is welded to the third and fourth welding points on the fixing plate one by one. After the protrusion passes through the socket and is welded, a tight fit is formed, and the fixing plate and the phase-to-phase plate are fixedly connected.

2. The DC circuit breaker with short-time delay function according to claim 1, characterized in that: The phase spacer is either securely connected to the base or integrally formed therefrom.

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