Automatic tripping device for circuit breaker

Abstract

The present invention provides an automatic tripping device for a circuit breaker, which belongs to the technical field of low-voltage circuit breaker control. The support frame and the base of the present invention are detachably connected, the pull rod and one end of the push-pull mechanism are movably connected, the limit block is arranged on the side of the pull rod close to the tripping mechanism and is several millimeters away from the pull rod, and is fixed on the base, the other end of the push-pull mechanism is detachably connected to the toggle mechanism, one end of the limit adjustable mechanism is rotatably sleeved with a column fixed on the base, the dial pin passes through the arc-shaped strip hole provided on the base and is inserted into the tripping hole, the outer diameter of the dial pin is adapted to the inner diameter of the tripping hole; the communication interface is electrically connected to the microprocessor, the microprocessor is electrically connected to the drive circuit, and the drive circuit is electrically connected to the coil. Compared with the existing automatic tripping device for circuit breaker, the present invention can transform the existing traditional circuit breaker into an Internet of Things and strengthen its real-time monitoring. In addition, the device has the advantages of simple structure and very short tripping action time.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage circuit breaker control, and in particular to an automatic tripping device for a circuit breaker. Background Art

[0002] Circuit breakers are widely used in civil and industrial electricity applications. Due to the frequent occurrence of circuit failures, it is necessary to cut off the circuit in a timely and effective manner to prevent accidents caused by circuit failures. Therefore, higher requirements are placed on the circuit breaker's rapid disconnection and remote operation capabilities.

[0003] Chinese patent CN201610169276.1 discloses a tripping and closing operation control device, including a housing, a motor, a drive gear, a handle gear, a handle turntable, and a trip rod; a pressure block on the end face of the drive gear can cooperate with one end of the trip rod, the handle turntable is used to set the handle inner shaft, and the handle connecting rod of the handle turntable is located in the receiving groove of the handle gear. When the motor rotates in one direction, the handle gear drives the handle turntable to rotate automatically to close the circuit breaker, and the motor rotates in the opposite direction to drive the handle gear back to the initial position. The handle turntable can rotate freely in the receiving groove to manually open and close the circuit breaker; when the motor rotates in the opposite direction, the pressure block can drive one end of the trip rod, so that the trip linkage shaft drives the trip linkage structure inside the circuit breaker to trip to achieve automatic opening and maintain the open state, so as to achieve functions such as automatic opening and closing, manual opening and closing after automatic closing, and non-manual closing after automatic opening. In addition, the scheme has a simple structure, good synchronous linkage of opening and closing, and fast opening speed. However, this scheme still has disadvantages such as slow opening action response speed, large mechanical impact of mechanism components, and easy damage of the mechanism. Summary of the Invention

[0004] The object of the present invention is to provide an automatic opening device for a circuit breaker in view of the above problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A circuit breaker automatic tripping device comprises a base, a shell cover, a microprocessor, a communication interface, a drive mechanism, a tripping mechanism, a push-pull mechanism and a limit block. The support frame of the drive mechanism is detachably connected to the base. The pull rod of the drive mechanism is movably connected to one end of the push-pull mechanism. The limit block is arranged on the side of the pull rod close to the tripping mechanism and several millimeters away from the pull rod, and is fixed to the base. The other end of the push-pull mechanism is detachably connected to the toggle mechanism of the tripping mechanism. One end of the limit adjustable mechanism of the tripping mechanism is rotatably sleeved with a column fixed to the base. The dial pin of the toggle mechanism passes through an arc-shaped strip hole provided in the base and is inserted into the tripping hole of the circuit breaker. The outer diameter of the dial pin is adapted to the inner diameter of the tripping hole. The communication interface is electrically connected to the microprocessor, the microprocessor is electrically connected to the drive circuit, and the drive circuit is electrically connected to the coil.

[0007] In the above-mentioned automatic tripping device for a circuit breaker, the driving mechanism includes an I-shaped frame, a coil, a support frame and a reciprocating motion mechanism. The bottom plate of the support frame is provided with a plurality of mounting holes that are adapted to the positions of the mounting columns provided on the base. Baffles are respectively provided on both sides of the support frame. The two baffles are respectively fixedly mounted on opposite sides of the bottom plate and are located on the same side of the bottom plate.

[0008] In the above-mentioned automatic tripping device for a circuit breaker, a 1# magnetic circuit hole and a 2# magnetic circuit hole are provided in the middle of the baffle, and the diameter of the 1# magnetic circuit hole is larger than the diameter of the 2# magnetic circuit hole. Mounting grooves are provided at both ends of the baffle away from the bottom plate.

[0009] In the above-mentioned automatic tripping device for a circuit breaker, the coil is detachably wound on the coil support of the I-frame, which is a hollow cylinder. Coil guards are fixed on both sides of the coil support. A through hole corresponding to the coil support is provided in the middle of the coil guard. Fixed blocks are provided on the top of the same side of the two coil guards away from the coil side. The I-frame is placed in the support frame, with the 1# magnetic circuit hole facing the side of the tripping mechanism, the fixed block and the mounting groove are adapted to each other, and the center lines of the 1# magnetic circuit hole, the 2# magnetic circuit hole and the through hole coincide.

[0010] In the above-mentioned automatic tripping device of a circuit breaker, the reciprocating motion mechanism includes a pull rod, an iron core and a spring. The diameter of the spring is larger than the diameter of the 2# magnetic circuit hole. A protrusion with a diameter smaller than the iron core is provided at the end of the iron core away from the pull rod. The diameter of the spring is larger than the diameter of the protrusion but smaller than the diameter of the iron core. One side of the spring is sleeved on the protrusion. The reciprocating motion mechanism is arranged in the coil support. The other side of the spring is in contact with the baffle where the 2# magnetic circuit hole is located. The side of the iron core close to the limit block is fixedly connected to the pull rod. When the spring is not compressed, the side of the iron core close to one end of the pull rod is flush with the side of the support frame close to the limit block. The diameter of the 1# magnetic circuit hole is adapted to the inner diameter of the coil and the diameter of the iron core.

[0011] In the above-mentioned automatic tripping device for a circuit breaker, a protrusion detachably connected to the pull rod is provided at one end of the pull rod away from the iron core. When the spring is not compressed and the reciprocating motion mechanism is placed in the coil support, the protrusion contacts the limit block.

[0012] In the above-mentioned automatic tripping device of a circuit breaker, the push-pull mechanism includes a transmission rod and a pull ring. A pull ring is provided on one side of the transmission rod close to the pull rod, and the other side is detachably connected to the end of the toggle mechanism away from the toggle pin. The transmission rod is flexibly and fixedly connected to the pull ring, and the pull ring is sleeved on the pull rod. The diameter of the pull ring is smaller than the diameter of the protrusion.

[0013] In the above-mentioned automatic tripping device of a circuit breaker, the tripping mechanism includes a toggle mechanism and a limit adjustable mechanism. The limit adjustable mechanism is provided with a long strip limit hole on the side away from the column. The end of the toggle mechanism away from the toggle pin passes through the long strip limit hole and the end of the transmission rod away from the pull ring is detachably connected to the limit adjustable mechanism.

[0014] In the above-mentioned automatic tripping device of a circuit breaker, the toggle mechanism includes a toggle pin, a positioning block and a fastening device. The adjustable limit mechanism and the transmission rod are arranged between the positioning block and the fastening device away from the end of the pull ring, and the fastening device is threadedly connected to one end of the toggle pin.

[0015] In the above-mentioned automatic tripping device for a circuit breaker, the heights of the support frame and the limit block are adapted to the height of the base.

[0016] Compared with the existing technology, the advantages of the present invention are:

[0017] 1. A circuit breaker automatic tripping device is designed. This device has a fast response to the tripping action. It does not require the transmission of a motor and various gears. Instead, the microprocessor directly outputs a signal to energize the coil. After the coil is energized, it immediately drives the push-pull mechanism and the tripping mechanism to operate, causing the circuit breaker to trip. The tripping action is very rapid.

[0018] 2. Compared with the existing circuit breaker tripping mechanism, the technical solution proposed by the present invention has reasonable connections between various components and small mechanical impact, which greatly enhances the service life of the device.

[0019] 3. This device is small in size and has a wide range of applications. In addition, it is very suitable for use in electrical cabinets that need to be automated and intelligentized. Since the space in traditional electrical cabinets is very limited, the miniaturization of the device can accommodate more new equipment.

[0020] 4. This device is suitable for intelligent transformation of traditional circuit breakers. The opening of traditional circuit breakers can only rely on the characteristics of the circuit breaker itself and cannot be automatically monitored. However, this device works with traditional circuit breakers to enable traditional circuit breakers to be connected to the Internet of Things system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the tripping device system;

[0022] Figure 2 It is a schematic diagram of the structure of the shell cover;

[0023] Figure 3 It is a schematic diagram of the support frame;

[0024] Figure 4 It is a structural diagram of an I-shaped frame;

[0025] Figure 5 It is a structural diagram of the opening mechanism;

[0026] Figure 6 It is a schematic diagram of the reciprocating motion mechanism structure;

[0027] Figure 7 It is a schematic diagram of the control system;

[0028] Figure 8 It is a schematic diagram of the circuit breaker's external structure;

[0029] In the figure, base 1, shell cover 2, microprocessor 3, communication interface 4, drive mechanism 5, opening mechanism 6, push-pull mechanism 7, limit block 8, support frame 9, pull rod 10, toggle mechanism 11, limit adjustable mechanism 12, column 13, dial pin 14, arc-shaped strip hole 15, circuit breaker 16, opening hole 17, coil 18, reciprocating motion mechanism 19, I-beam 20, mounting hole 21, mounting column 22, baffle 23, bottom plate 24, 1# magnetic circuit hole 25, 2# magnetic circuit hole 26, mounting groove 27, coil support 28, coil guard plate 29, through hole 30, fixing block 31, iron core 32, spring 33, protrusion 34, protrusion 35, transmission rod 36, pull ring 37, long strip limit hole 38, positioning block 39, fastening device 40. DETAILED DESCRIPTION

[0030] like Figures 1 to 8 As shown, a circuit breaker automatic opening device includes a base 1, a shell cover 2, a microprocessor 3, a communication interface 4, a drive mechanism 5, a tripping mechanism 6, a push-pull mechanism 7 and a limit stop 8. The support frame 9 of the drive mechanism 5 is detachably connected to the base 1, the pull rod 10 of the drive mechanism 5 is movably connected to one end of the push-pull mechanism 7, the limit stop 8 is set on the side of the pull rod 10 close to the tripping mechanism 6 and several millimeters away from the pull rod 10, and is fixed to the base 1. The other end of the push-pull mechanism 7 is connected to the tripping mechanism. 6, the toggle mechanism 11 is detachably connected, one end of the limit adjustable mechanism 12 of the trip mechanism 6 is rotatably connected to the column 13 fixed on the base 1, and the dial pin 14 of the toggle mechanism 11 passes through the arc-shaped strip hole 15 opened on the base 1 and is inserted into the trip hole 17 of the circuit breaker 16. The outer diameter of the dial pin 14 is adapted to the inner diameter of the trip hole 17; the communication interface 4 is electrically connected to the microprocessor 3, the microprocessor 3 is electrically connected to the drive circuit 3a, and the drive circuit 3a is electrically connected to the coil 18.

[0031] In existing automatic closing and opening technologies, a micro motor is used to drive the opening device to achieve opening. The opening speed is slow and often fails to meet the opening requirements in emergency situations, resulting in worsening electrical accidents. In addition, the mechanical impact between the various mechanisms of this solution is relatively small, which extends the life of the mechanical structure. In addition, the existing solution also has disadvantages such as complex structure and difficulty in maintenance.

[0032] Technicians in the relevant technical field should understand that the position of the opening hole 17 of the circuit breaker 16 is different after successful closing and successful opening. After closing is completed, the opening hole 17 is on the side of the arc-shaped strip hole 15 close to the opening mechanism 6. When opening is successful, the opening hole 17 is on the side of the arc-shaped strip hole 15 away from the opening mechanism 6.

[0033] In this embodiment, Figure 1 、 3 As shown in Figures 4 and 6, the microprocessor 3 is electrically connected to the communication interface 4. The microprocessor 3 receives a remote tripping control signal from a control system electrically connected to the communication interface 4. The microprocessor 3 controls the power circuit to supply power to the coil 18. After the coil 18 is energized, magnetism is generated. The iron core 32 of the reciprocating motion mechanism 19 arranged inside the coil 18 moves in a direction away from the limit block 8 under the action of the magnetic field. Because the end of the spring 33 away from the limit block 8 is blocked by the baffle 23 with the 2# magnetic circuit hole 26, and the diameter of the spring 33 is larger than the diameter of the 2# magnetic circuit hole 26, the spring 33 is compressed when the reciprocating motion mechanism 19 moves in a direction away from the limit block 8.

[0034] The pull ring 37 of the push-pull mechanism 7 and the pull rod 10 of the reciprocating motion mechanism 19 are slidingly connected, that is, the pull ring 37 of the push-pull mechanism 7 is sleeved on the pull rod 10 of the reciprocating motion mechanism 19, and the protrusion 35 is arranged at the end of the pull rod 10 away from the iron core 32. Therefore, when the reciprocating motion mechanism 19 moves in the direction away from the limit block 8, the pull rod 10 and the protrusion 35 pull the pull ring 37 to move toward the side of the driving mechanism 5. Therefore, the transmission rod 36 is driven by the pull ring 37 to move toward the side of the driving mechanism 5.

[0035] When the circuit breaker 16 is in the closed state or before opening, the dial pin 14 of the toggle mechanism 11 is inserted into the opening hole 17 of the circuit breaker, and the toggle mechanism 11 is located on the side of the arc-shaped strip hole 15 away from the driving mechanism 5; when the opening is completed, the toggle mechanism 11 is located on the side of the arc-shaped strip hole 15 close to the driving mechanism 5; when the closing is completed, the pull ring 37 is tightly attached to the side of the protrusion 35 close to the driving mechanism 5 and is in a taut state. As long as the driving mechanism 5 pulls the pull ring 5 to the side away from the limit block 8, it can immediately drive the opening mechanism 6 to open. When the opening is completed, the pull ring 37 is on the pull rod 10 and is in a free and untightened state.

[0036] One end of the limit adjustable mechanism 12 of the opening mechanism 6 is detachably connected to the toggle mechanism 11, and the other end is rotatably connected to the column 13 fixed to the base 1. When the transmission rod 36 is pulled toward the side of the driving mechanism 5, the toggle mechanism 11 is driven by the transmission rod 36 to move along the arc-shaped strip hole 15 toward the side of the driving mechanism 5, so that the dial pin 14 drives the circuit breaker's trip device to move toward the direction of the driving mechanism 5, thereby realizing the opening of the circuit breaker. After the opening is completed, the opening state is maintained and the spring 33 is in a compressed state.

[0037] After the microprocessor 3 controls the power circuit to energize the coil 18 for several seconds, the circuit breaker is successfully opened. Then the microprocessor 3 controls the power circuit to disconnect, the coil 18 loses power, and the coil 18 loses its magnetism. Because the iron core 32 and the spring 33 of the reciprocating motion mechanism 19 are movably connected, the iron core 32 moves toward the limit block 8 under the action of the elastic force of the spring 33 until the protrusion 35 of the pull rod 10 contacts the limit block 8. At the same time, the side of the iron core 32 close to one end of the pull rod 10 is flush with the side of the support frame 9 close to the limit block 8. Since the transmission rod 36 and the pull ring 37 are fixedly connected by flexible material, the push-pull mechanism 7 does not move during the movement of the reciprocating motion mechanism 19 toward the limit block 8.

[0038] During the closing process of the circuit breaker 16, the toggle mechanism 11 and the tripping mechanism of the circuit breaker 16 are driven by the closing mechanism of the circuit breaker 16, and the toggle mechanism 11 is pulled from the side of the arc-shaped strip hole 15 close to the driving mechanism 5 to the side close to the opening mechanism 6. The toggle mechanism 11 drives the transmission rod 36 to move in the direction away from the driving mechanism 5. During the closing process, the pull ring 37 has no pulling force on the pull rod 10. After the closing is successful, the flexible material between the pull ring 37 and the transmission rod 36 is in a taut state.

[0039] like Figure 3 and 4 As shown, after the I-shaped frame 20 is placed inside the support frame 9, the side of the baffle 23 away from the bottom plate 24 is adapted to the height of the base 1, and the support frame is mounted on the base 1 through the mounting hole 21 and the mounting column 22, and then the support frame 9 is pressed with the shell cover 2 to ensure that the drive mechanism 5 is stably installed between the base 1 and the shell cover 2. In addition, the height of the limit block 8 is adapted to the height of the base 1, and when the protrusion 35 touches the limit block 8, the protrusion 35 can be completely fitted on the side of the limit block 8.

[0040] A circuit board is provided in the middle of the base 1, and the microprocessor 3 and its auxiliary circuits, power supply circuit and communication circuit are all arranged on the circuit board. The communication interface 4 is electrically connected to the communication function interface of the microprocessor 3, that is, the communication interface 4 is electrically connected to the microprocessor 3. The communication interface 4 is arranged on the shell cover 2, which is convenient for electrical connection with the remote control system.

[0041] like Figure 5 As shown, since a long strip limiting hole 38 is provided in the middle of the limit adjustable mechanism 12, the toggle mechanism 11 can be adjusted according to the position of the gate opening 17, and the positioning block 39 is provided on the lower surface of the limit adjustable mechanism 12. The toggle mechanism 11 passes through the long strip limiting hole 38, and then the toggle mechanism 11 is fixed to the limit adjustable mechanism 12 by a fastening device 40. The inner surface of the fastening device 40 and the dial pin 14 are threadedly connected near one end of the fastening device 40.

[0042] Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them with similar methods, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0043] Although this article uses the base 1, shell cover 2, microprocessor 3, communication interface 4, drive mechanism 5, tripping mechanism 6, push-pull mechanism 7, limit block 8, support frame 9, pull rod 10, toggle mechanism 11, limit adjustable mechanism 12, column 13, dial pin 14, arc-shaped strip hole 15, circuit breaker 16, tripping hole 17, coil 18, reciprocating motion mechanism 19, I-beam 20, mounting hole 21, mounting column 22, baffle 23, bottom plate 24, 1# magnetic circuit hole 25, 2# magnetic circuit hole 26, mounting groove 27, coil support 28, coil guard plate 29, through hole 30, fixing block 31, iron core 32, spring 33, protrusion 34, protrusion 35, transmission rod 36, pull ring 37, long strip limit hole 38, positioning block 39, fastening device 40 more frequently, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; any additional limitation construed in them would be contrary to the spirit of the present invention.

Claims

1. A circuit breaker automatic opening device, comprising a base (1) and a shell cover (2), characterized in that: The invention comprises a microprocessor (3), a communication interface (4), a driving mechanism (5), a tripping mechanism (6), a push-pull mechanism (7) and a limit block (8); a support frame (9) of the driving mechanism (5) and a base (1) are detachably connected; a pull rod (10) of the driving mechanism (5) and one end of the push-pull mechanism (7) are movably connected; the limit block (8) is arranged on a side of the pull rod (10) close to the tripping mechanism (6) and several millimeters away from the pull rod (10), and is fixed on the base (1); the other end of the push-pull mechanism (7) and the toggle mechanism (11) of the tripping mechanism (6) are movably connected; The connection is disassembled, one end of the limit adjustable mechanism (12) of the trip mechanism (6) is rotatably connected to the column (13) fixed on the base (1), the dial pin (14) of the toggle mechanism (11) passes through the arc-shaped strip hole (15) provided on the base (1) and is inserted into the trip hole (17) of the circuit breaker (16), and the outer diameter of the dial pin (14) is adapted to the inner diameter of the trip hole (17); the communication interface (4) is electrically connected to the microprocessor (3), the microprocessor (3) is electrically connected to the drive circuit (3a), and the drive circuit (3a) is electrically connected to the coil (18); The driving mechanism (5) includes an I-shaped frame (20), a coil (18), a support frame (9) and a reciprocating motion mechanism (19); a bottom plate (24) of the support frame (9) is provided with a plurality of mounting holes (21) adapted to the positions of mounting posts (22) provided on the base (1); baffles (23) are respectively provided on both sides of the support frame (9); the two baffles (23) are respectively fixedly mounted on opposite sides of the bottom plate (24) and are located on the same side of the bottom plate (24); A #1 magnetic circuit hole (25) and a #2 magnetic circuit hole (26) are provided in the middle of the baffle (23), and the diameter of the #1 magnetic circuit hole (25) is larger than the diameter of the #2 magnetic circuit hole (26). Mounting grooves (27) are respectively provided at both ends of the side of the baffle (23) away from the bottom plate (24).

2. The circuit breaker automatic opening device according to claim 1, characterized in that: The coil (18) is detachably wound on the coil support (28) of the I-shaped frame (20). The coil support (28) is a hollow cylinder. Coil guard plates (29) are fixed on both sides of the coil support (28). A through hole (30) adapted to the coil support (28) is provided in the middle of the coil guard plate (29). A fixing block (31) is provided on the top of the same side of the two coil guard plates (29) away from the coil (18). The I-shaped frame (20) is placed in the support frame (9), the No. 1 magnetic circuit hole (25) faces the side of the opening mechanism (6), the fixing block (31) is adapted to the mounting groove (27), and the center lines of the No. 1 magnetic circuit hole (25), the No. 2 magnetic circuit hole (26) and the through hole (30) coincide.

3. The circuit breaker automatic opening device according to claim 1, characterized in that: The reciprocating mechanism (19) includes a pull rod (10), an iron core (32) and a spring (33). The diameter of the spring (33) is larger than the diameter of the 2# magnetic circuit hole (26). The iron core (32) is provided with a protrusion (34) with a diameter smaller than that of the iron core (32) at one end away from the pull rod (10). The diameter of the spring (33) is larger than the diameter of the protrusion (34) and smaller than the diameter of the iron core (32). One side of the spring (33) is sleeved on the protrusion (34). The reciprocating mechanism (19) is provided with The spring (33) is placed in the coil support (28), the other side of the spring (33) is in contact with the baffle (23) where the 2# magnetic circuit hole (26) is located, and the side of the iron core (32) close to the limit block (8) is fixedly connected to the pull rod (10). When the spring (33) is not compressed, the side of the iron core (32) close to one end of the pull rod (10) is flush with the side of the support frame (9) close to the limit block (8), and the diameter of the 1# magnetic circuit hole (25) is adapted to the inner diameter of the coil (18) and the diameter of the iron core (32).

4. The automatic tripping device for a circuit breaker according to claim 3, characterized in that: A protrusion (35) detachably connected to the pull rod (10) is provided at one end of the pull rod (10) away from the iron core. When the spring (33) is not compressed and the reciprocating mechanism (19) is placed in the coil support (28), the protrusion (35) contacts the limit block (8).

5. The circuit breaker automatic opening device according to claim 1, characterized in that: The push-pull mechanism (7) comprises a transmission rod (36) and a pull ring (37). The transmission rod (36) is provided with a pull ring (37) on one side close to the pull rod (10), and the other side is detachably connected to the end of the toggle mechanism (11) away from the toggle pin (14). The transmission rod (36) and the pull ring (37) are flexibly fixedly connected. The pull ring (37) is sleeved on the pull rod (10), and the diameter of the pull ring (37) is smaller than the diameter of the protrusion (35).

6. The circuit breaker automatic opening device according to claim 1, characterized in that: The opening mechanism (6) comprises a toggle mechanism (11) and a limit adjustable mechanism (12); a long strip limit hole (38) is provided on the side of the limit adjustable mechanism (12) away from the column (13); an end of the toggle mechanism (11) away from the setting pin (14) passes through the long strip limit hole (38) and an end of the transmission rod (36) away from the pull ring (37) is detachably connected to the limit adjustable mechanism (12).

7. The circuit breaker automatic opening device according to claim 1, characterized in that: The shifting mechanism (11) comprises a shifting pin (14), a positioning block (39) and a fastening device (40); the limit adjustable mechanism (12) and the transmission rod (36) are arranged between the positioning block (39) and the fastening device (40) at one end away from the pull ring (37); and the fastening device (40) is threadedly connected to one end of the shifting pin (14).

8. The circuit breaker automatic opening device according to claim 1, characterized in that: The heights of the support frame (9) and the limit block (8) are adapted to the height of the base (1).

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