Plug-in circuit breaker and control system

Abstract

The invention relates to the technical field of circuit breakers, in particular to a plug-in circuit breaker and a control system.The plug-in circuit breaker comprises a protective shell and a tripping mechanism installed in the protective shell, a moving contact piece is arranged in the tripping mechanism, a static contact is arranged in the protective shell, and the moving contact piece is driven to move through the tripping mechanism; therefore, the moving contact piece and the static contact are in contact conduction or separated disconnection, so that the state switching of the circuit breaker is realized. According to the plug-in circuit breaker, the positive pressure gas can be generated when the circuit breaker trips out, the positive pressure gas is blown out through the gas spraying hole in the moving contact piece, arc blowing guiding is conducted on an electric arc between the moving contact piece and the static contact, the electric arc enters the arc extinguish chamber more efficiently and stably, high temperature of the arc extinguish chamber can be discharged easily, and the service life of the product is prolonged.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, specifically to a pluggable circuit breaker and its control system. Background Technology

[0002] A circuit breaker is a power device used in a power system to connect and disconnect circuits and protect them from overload and short-circuit faults. It mainly consists of an arc-extinguishing system, a tripping mechanism, an electromagnetic system, and a bimetallic strip. During a short circuit, a large instantaneous current drives the electromagnetic system to operate, triggering the tripping mechanism. Under sustained overload, the bimetallic strip bends at high temperatures, causing the tripping mechanism to activate. The arc generated when the circuit breaker trips is extinguished by the arc-extinguishing system. In existing technology, the arc can only be naturally guided into the arc-extinguishing system by an arc-initiating plate. This method is not conducive to venting the high temperatures generated by the arc, and after the surface of the arc-initiating plate oxidizes, its arc-initiating performance becomes unstable, making it difficult for the arc to completely enter the arc-extinguishing chamber. With long-term use, this leads to a faster shortening of the circuit breaker's lifespan. Summary of the Invention

[0003] The purpose of this invention is to provide a pluggable circuit breaker and control system to solve the problems of unstable arc ignition performance and low high-temperature discharge efficiency of circuit breakers mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a plug-in circuit breaker, comprising a protective housing and a tripping mechanism installed inside the protective housing. The tripping mechanism includes a moving contact, and the protective housing includes a stationary contact. The tripping mechanism drives the moving contact to move, causing the moving contact to contact the stationary contact for conduction or separation, thereby achieving state switching of the circuit breaker. The protective housing also includes an arc-extinguishing chamber, a lever, and a rebound gas cylinder unit. The lever is connected to the tripping mechanism to achieve mutual driving. A gas nozzle is provided in the moving contact. When the moving contact and stationary contact are in contact, the lever compresses the rebound gas cylinder unit. When the moving contact and stationary contact separate, the rebound gas cylinder unit simultaneously loses the compression of the lever, generating positive pressure gas which is input into the gas nozzle. This causes the gas nozzle to expel gas, driving the arc generated when the moving contact and stationary contact separate into the arc-extinguishing chamber for arc extinguishing.

[0005] The protective shell has double-sided exhaust holes and a third exhaust hole on its surface, and a side channel is provided inside the protective shell. The double-sided exhaust holes are connected to the arc-extinguishing chamber, and the third exhaust hole is connected to the arc-extinguishing chamber through the side channel.

[0006] The rebound air cylinder unit includes an air cylinder section, an inward-folding pressure lip, and a first piston. The air cylinder section is fixedly mounted on the inner wall surface of the protective shell. An inward-folding pressure lip is provided at the end of the air cylinder section. The first piston is slidably mounted inside the air cylinder section. The first piston and the air cylinder section are in sealed contact. A drive spring is provided between the inward-folding pressure lip and the first piston.

[0007] A piston top shaft is fixedly installed on the first piston. The piston top shaft passes through the side wall of the protective shell and extends to the outside of the protective shell. The piston top shaft and the side wall of the protective shell are in sealed contact. The drive spring provides elastic pressure to the first piston, so that the first piston drives the piston top shaft to have an outward extension tendency. When the moving contact and the stationary contact are in contact and conducting, the handle squeezes the piston top shaft, so that the piston top shaft is in a retracted state. At this time, the drive spring is compressed. A cylinder nozzle communicating with the cylinder is provided on the outside of the air cylinder. The cylinder nozzle is connected to the gas injection hole through a hose.

[0008] The surface of the air cylinder is provided with a movable groove, and a vertical part is provided in the movable groove. A drive pressure rod is fixedly installed on the vertical part. A synchronous outer ring is sleeved on the outside of the air cylinder. The synchronous outer ring is fixedly installed with the vertical part. The axial movement of the synchronous outer ring drives the drive pressure rod to drive the first piston to move axially, thereby causing the piston top shaft to push the lever to trip.

[0009] A magnetic backplate is fixedly installed on the outer ring of the synchronization. A control electromagnet is installed inside the protective shell. By energizing the control electromagnet, the control electromagnet can generate magnetic force, thereby driving the magnetic backplate to move the outer ring of the synchronization axially, causing the lever to trip.

[0010] The air cylinder section is also equipped with a second piston, which is located between the first piston and the drive spring. A conical air nozzle is fixedly provided on the surface of the second piston, and a gap air hole is opened through the surface of the second piston. The conical air nozzle communicates with the gap between the second piston and the first piston through the gap air hole.

[0011] A stage blind groove is provided in the piston top shaft, and a stage sealing shaft is fixedly installed on the second piston. The stage sealing shaft is inserted into the stage blind groove, and a radiation nozzle is provided through the inner wall surface of the stage blind groove. When the stage sealing shaft is pulled out from the stage blind groove, the stage blind groove is connected to the inner cavity of the air cylinder through the radiation nozzle.

[0012] The protective shell also houses a compressed gas cylinder, which is equipped with a temperature-controlled exhaust assembly. The compressed gas cylinder contains compressed gas, and the temperature-controlled exhaust assembly is connected to the conical nozzle via a flexible hose. The temperature-controlled exhaust assembly releases the compressed gas from the compressed gas cylinder into the conical nozzle, driving the first piston and the second piston to move apart.

[0013] A control system for a pluggable circuit breaker is provided. The control system uses a pluggable circuit breaker and also includes an external power supply module. The external power supply module supplies power to the control electromagnet, thereby controlling the pluggable circuit breaker to trip and disconnect.

[0014] Compared with the prior art, the beneficial effects of the present invention are: The plug-in circuit breaker of this invention, through the combination of gas nozzles and rebound gas cylinder units, can generate positive pressure gas at the same time as the circuit breaker trips. The gas is blown out through the gas nozzles on the moving contact to guide the arc between the moving and stationary contacts, so that it enters the arc-extinguishing chamber more efficiently and stably, and is also conducive to venting the high temperature in the arc-extinguishing chamber and improving the product life.

[0015] This invention enables the circuit breaker to have an active tripping function by cooperating with a control electromagnet and a rebound air cylinder unit. Compared with the circuit breakers in the technology that can only trip due to short circuits and overloads, the circuit breaker of this invention can actively control the tripping to adapt to a wider range of application scenarios and improve functionality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is another schematic diagram of the overall structure of the present invention.

[0018] Figure 3 This is a schematic diagram showing the protective casing of the present invention when opened.

[0019] Figure 4 Open the front view of the protective casing of this invention.

[0020] Figure 5 This is a three-dimensional half-sectional schematic diagram of the air cylinder section of the present invention.

[0021] Figure 6 This is a partial three-dimensional cross-sectional view of the air cylinder section of the present invention.

[0022] Figure 7 This is a schematic diagram of the synchronous outer ring structure of the present invention.

[0023] Figure 8 This is a schematic diagram of the moving contact component of the present invention.

[0024] Figure 9 This is a three-dimensional half-section schematic diagram of the compressed gas cylinder of the present invention.

[0025] In the diagram: 1. Protective outer shell; 2. Tripping mechanism; 3. Moving contact; 4. Stationary contact; 5. Handle; 6. Gas nozzle; 7. Compressed gas cylinder; 8. Arc extinguishing chamber; 501. Gas cylinder section; 502. Inward-turning pressure lip; 503. First piston; 504. Drive spring; 505. Piston top shaft; 506. Cylinder nozzle; 507. Movable groove; 508. Vertical section; 509. Drive pressure rod; 510. Synchronous outer ring; 511. Magnetic back plate; 512. Control electromagnet; 701. Second piston; 702. Conical nozzle; 703. Gap air hole; 704. Stage blind groove; 705. Stage sealing shaft; 706. Radiation nozzle; 70 7. Control base; 708. Semi-arc support plate; 709. Insulating sleeve; 710. Conductive heat pipe; 711. Thermal expansion rod; 712. Thermal pad; 713. One-way cone plate; 714. Annular rim; 715. Output nozzle; 716. Expansion top seat; 717. Arc-shaped spring; 9. Insertion slot; 10. Outgoing terminal; 11. Electromagnetic trigger unit; 12. Bimetallic spring; 101. Double-sided exhaust port; 102. Third exhaust port; 103. Side channel; 104. Control terminal block; 105. Air inlet; 201. U-shaped connecting rod; 202. Traction rod; 601. Contact nozzle; 801. Arc blocking plate; 802. Arc ignition plate. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figures 1 to 9 The present invention provides a technical solution: a pluggable circuit breaker, such as... Figure 3 As shown, the protective housing 1 constitutes an insulating protective housing, and a tripping mechanism 2 is provided inside the protective housing 1. The tripping mechanism 2 is a tripping component in the prior art. The tripping mechanism 2 is provided with a moving contact 3, which is made of copper. The protective housing 1 is provided with a stationary contact 4. The contact point between the moving contact 3 and the stationary contact 4 is silver plated. The tripping mechanism 2 drives the moving contact 3 to move.

[0028] The protective casing 1 also includes an arc-extinguishing chamber 8, a lever 5, and a rebound air cylinder unit, such as... Figure 4 As shown, the arc-extinguishing chamber 8 is equipped with an arc-blocking plate 801 and an arc-inducing plate 802, both of which are existing structures. The lever 5 is connected to the tripping mechanism 2 to achieve mutual driving. Figure 3As shown, a U-shaped connecting rod 201 is provided between the lever 5 and the tripping mechanism 2. When the lever 5 is moved, the tripping mechanism 2 can be driven to move through the U-shaped connecting rod 201. When the tripping mechanism 2 moves, it can also drive the lever 5 through the U-shaped connecting rod 201, realizing the action linkage. Inside the protective housing 1, there is also a plug-in slot 9, a wire outlet terminal 10, an electromagnetic trigger unit 11, and a bimetallic spring 12, as shown. Figure 3 As shown, the electromagnetic trigger unit 11 and the bimetallic spring 12 are connected in series between the plug-in slot 9 and the output terminal 10. The plug-in slot 9 is a plug-in connection structure, mainly used in the power distribution systems of users in North America, and the output terminal 10 is a conventional bolt-type crimp terminal.

[0029] When the line is short-circuited, a large instantaneous current passes through the electromagnetic trigger unit 11, causing the electromagnetic trigger unit 11 to activate and drive the tripping mechanism 2 to trip. At this time, the lever 5 trips, and the moving contact 3 and the stationary contact 4 separate.

[0030] When the circuit is overloaded, the electromagnetic trigger unit 11 is not triggered, but the bimetallic spring 12 accumulates heat under overload conditions. The bimetallic spring 12 is made of two metal sheets with different coefficients of thermal expansion, and it will bend at high temperatures, such as... Figure 3 As shown, a traction rod 202 is connected between the bimetallic spring 12 and the tripping mechanism 2. When the bimetallic spring 12 bends, the traction rod 202 pulls the tripping mechanism 2 to move, which in turn drives the moving contact 3 and the stationary contact 4 to separate.

[0031] The moving contact 3 is provided with a gas nozzle 6. When the moving contact 3 and the stationary contact 4 are in contact and conducting, the lever 5 squeezes the rebound air cylinder unit. When the moving contact 3 and the stationary contact 4 are separated, the rebound air cylinder unit simultaneously loses the squeezing of the lever 5, generates positive pressure gas and inputs it into the gas nozzle 6, so that the gas nozzle 6 sprays gas to drive the electric arc generated when the moving contact 3 and the stationary contact 4 are separated and enters the arc extinguishing chamber 8 for arc extinguishing.

[0032] The protective housing 1 has a double-sided exhaust port 101 and a third exhaust port 102 on its surface. The protective housing 1 has a side channel 103 inside. The double-sided exhaust port 101 is connected to the arc-extinguishing chamber 8, and the third exhaust port 102 is connected to the arc-extinguishing chamber 8 through the side channel 103.

[0033] The rebound air cylinder unit includes an air cylinder section 501, an inward-folding pressure plate 502, and a first piston 503. The air cylinder section 501 is embedded and fixedly mounted on the inner wall surface of the protective shell 1. The protective shell 1 is made of insulating materials such as plastic, while the air cylinder section 501 is made of steel tubular material. The two are fixedly connected by embedding. The end of the air cylinder section 501 is provided with an inward-folding pressure plate 502. The first piston 503 is slidably disposed inside the air cylinder section 501, and there is a sealed contact between the first piston 503 and the air cylinder section 501. A drive spring 504 is provided between the inward-folding pressure plate 502 and the first piston 503.

[0034] A piston top shaft 505 is fixedly installed on the first piston 503. The piston top shaft 505 passes through the side wall of the protective housing 1 and extends to the outside of the protective housing 1. The piston top shaft 505 and the side wall of the protective housing 1 are in sealed contact. The drive spring 504 provides elastic pressure to the first piston 503, so that the first piston 503 drives the piston top shaft 505 to have an outward extension tendency. When the moving contact 3 and the stationary contact 4 are in contact and conducting, the handle 5 presses against the piston top shaft 505, causing the piston top shaft 505 to be in a retracted state. At this time, the drive spring 504 is compressed. An external cylinder nozzle 506 is provided on the outside of the cylinder section 501, communicating with the cylinder section 501. The cylinder nozzle 506 is connected to the gas injection port 6 via a flexible hose. Figure 8 As shown, a contact nozzle 601 is welded to the surface of the moving contact 3. The gas nozzle 6 is connected to the contact nozzle 601. When the cylinder nozzle 506 and the gas nozzle 6 are connected, the gas is connected to the gas hose through the contact nozzle 601.

[0035] The surface of the air cylinder part 501 is provided with a movable groove 507, and a vertical part 508 is provided in the movable groove 507. A drive pressure rod 509 is fixedly installed on the vertical part 508. A synchronous outer ring 510 is sleeved on the outside of the air cylinder part 501. The synchronous outer ring 510 is fixedly installed with the vertical part 508. The axial movement of the synchronous outer ring 510 drives the drive pressure rod 509 to drive the first piston 503 to move axially, thereby causing the piston top shaft 505 to push the handle 5 to trip.

[0036] A magnetic backplate 511 is fixedly installed on the outer synchronous ring 510. A control electromagnet 512 is installed inside the protective housing 1. By energizing the control electromagnet 512, it generates magnetic force, thereby driving the magnetic backplate 511 to move the outer synchronous ring 510 axially, causing the lever 5 to trip. Figure 1 As shown, the surface of the protective housing 1 is provided with a control terminal block 104, which is connected to the control electromagnet 512 circuit. An external power supply module is connected to the control terminal block 104 to achieve power supply connection with the control electromagnet 512.

[0037] The air cylinder section 501 is also provided with a second piston 701, which is located between the first piston 503 and the drive spring 504. A conical air nozzle 702 is fixedly provided on the surface of the second piston 701, and a gap air hole 703 is opened through the surface of the second piston 701. The conical air nozzle 702 communicates with the gap between the second piston 701 and the first piston 503 through the gap air hole 703.

[0038] A stage blind groove 704 is provided in the piston top shaft 505. A stage sealing shaft 705 is fixedly installed on the second piston 701. The stage sealing shaft 705 is inserted into the stage blind groove 704. A radiation nozzle 706 is provided through the inner wall surface of the stage blind groove 704. When the stage sealing shaft 705 is pulled out from the stage blind groove 704, the stage blind groove 704 communicates with the inner cavity of the air cylinder part 501 through the radiation nozzle 706.

[0039] The protective casing 1 also houses a compressed gas cylinder 7. The compressed gas cylinder 7 is equipped with a temperature-controlled exhaust assembly. The compressed gas cylinder 7 stores compressed gas, such as... Figure 2 As shown, an inflation nozzle 105 is installed on the surface of the protective shell 1. The inflation nozzle 105 is connected to the compressed gas cylinder 7, and can replenish the compressed gas cylinder 7 with gas through the inflation nozzle 105. The temperature-controlled exhaust assembly is connected to the conical nozzle 702 through a hose. The temperature-controlled exhaust assembly can release the compressed gas in the compressed gas cylinder 7 into the conical nozzle 702, driving the first piston 503 and the second piston 701 to move apart. The temperature-controlled exhaust assembly in this invention, such as Figure 9 As shown, the device includes a control base 707 and a semi-circular support plate 708. The control base 707 is integrally fixedly mounted on the outer surface of the compressed gas cylinder 7, and the semi-circular support plate 708 is fixedly installed on the control base 707. An insulating sleeve 709 is provided in the control base 707, and a conductive heat pipe 710 is provided in the insulating sleeve 709. The insulating sleeve 709 insulates the conductive heat pipe 710 from the control base 707.

[0040] The conductive heat pipe 710 serves as a circuit connection. The conductive heat pipe 710 is connected in series between the plug-in slot 9 and the electromagnetic trigger unit 11. Specifically, one end of the conductive heat pipe 710 is soldered to the plug-in slot 9, and the other end is soldered to one end of the coil of the electromagnetic trigger unit 11. Thus, the circuit connection between the plug-in slot 9 and the electromagnetic trigger unit 11 is achieved through the conductive heat pipe 710. When the circuit is overloaded, the conductive heat pipe 710 can also generate heat.

[0041] A thermal expansion rod 711 is inserted into the conductive heat pipe 710, and a thermally conductive pad 712 is filled between the conductive heat pipe 710 and the thermal expansion rod 711. The thermally conductive pad 712 can conduct heat from the conductive heat pipe 710 to the thermal expansion rod 711. A one-way conical disk 713 is fixedly installed at one end of the thermal expansion rod 711. An annular rim 714 is provided in the control seat 707. The one-way conical disk 713 and the annular rim 714 cooperate to achieve a seal, so that the compressed gas in the compressed gas cylinder 7 will not leak out. An output nozzle 715 is provided externally to the control seat 707. When the one-way conical disk 713 separates from the annular rim 714, the compressed gas in the compressed gas cylinder 7 will be ejected through the output nozzle 715. The output nozzle 715 is connected to the conical nozzle 702 through a flexible air tube.

[0042] An expansion top seat 716 is fixedly installed on the semi-circular support plate 708, and an arc-shaped spring piece 717 is installed between the expansion top seat 716 and the thermal expansion rod 711. Figure 9 As shown, the arc-shaped spring 717 applies an elastic tension to the thermal expansion rod 711, giving the thermal expansion rod 711 an elastic tendency to move towards the expansion top seat 716, thereby enabling the one-way conical disk 713 and the annular rim 714 to make sealing contact. In the initial state, there is a gap between the ends of the thermal expansion rod 711 and the expansion top seat 716.

[0043] When the conductive heat pipe 710 heats the thermal expansion rod 711 through the thermal pad 712, the thermal expansion rod 711 heats up to a certain degree and expands, causing the end of the thermal expansion rod 711 to press against the expansion top seat 716. At this time, as the thermal expansion rod 711 expands and elongates, the one-way cone disk 713 separates from the annular rim 714, allowing the compressed gas in the compressed gas cylinder 7 to be ejected through the output nozzle 715 and enter the conical nozzle 702.

[0044] A control system for a pluggable circuit breaker is disclosed. The control system utilizes a pluggable circuit breaker and includes an external power supply module. This external power supply module supplies power to a control electromagnet 512, thereby controlling the pluggable circuit breaker to trip. The external power supply module only needs to provide sufficient power to the control electromagnet 512. Figure 5 and Figure 6 As shown, when the control electromagnet 512 generates magnetic force, it attracts the magnetic back plate 511 to move to the right, and the outer ring 510 moves to the right axially. Through the vertical part 508, it drives the drive pressure rod 509 to push the second piston 701 and the first piston 503 to move to the right a certain distance. The piston top shaft 505 squeezes the handle 5, causing the handle 5 to pass the dead point position of the tripping mechanism 2, triggering the handle 5 to trip, thereby realizing the circuit breaker's active control circuit breaking.

[0045] When the circuit breaker of this invention is in the closed state, such as Figure 6As shown, the lever 5 presses against the piston top shaft 505, causing the first piston 503 and the second piston 701 to move synchronously to the left. At this time, the first piston 503 and the second piston 701 are in close contact, considered as a single piston structure. Under the pressure of the lever 5, the drive spring 504 is in a compressed state. The dead point position in the tripping mechanism 2 of this invention takes into account the elastic force of the drive spring 504 during design, so that when the lever 5 is in the closed state and compresses the drive spring 504, the triggering of the tripping mechanism 2 is not affected. The dead point position is the critical position where the driving torque is zero when the line of action of the driving force passes through the center of the driven member hinge. At this point, the mechanism cannot move on its own and requires external force intervention to disengage from this position. In the tripping mechanism 2, the dead point is a deliberately designed key structure used to ensure the stability of the closed state.

[0046] When the tripping mechanism 2 trips under the drive of the electromagnetic trigger unit 11 or the bimetallic spring 12, the moving contact 3 separates from the stationary contact 4, and the lever 5 trips synchronously. During the tripping movement of the lever 5, the drive spring 504 pushes the second piston 701 and the first piston 503 to move synchronously to the right through its elastic support, forcing the gas in the gas cylinder section 501 to be output through the cylinder nozzle 506, enter the gas nozzle 6 through the gas hose, and be ejected through the gas nozzle 6. Figure 5 and Figure 8 As shown, the moving contact 3 is sprayed with gas through the gas nozzle 6. When the moving contact 3 and the stationary contact 4 are disconnected and an electric arc is generated, the gas blows the arc and drives it to move into the arc-extinguishing chamber 8, so that the arc enters the arc-extinguishing chamber 8 more stably. The gas is discharged through the double exhaust port 101 and the third exhaust port 102, which can reduce the heat in the arc-extinguishing chamber 8 and extend the life of the arc-extinguishing chamber 8.

[0047] In harsh environments, the tripping mechanism 2 may become stuck due to dust or corrosion. This can lead to two situations where the circuit breaker fails to trip. One situation is that the circuit breaker trips due to overload. Although the bimetallic spring 12 heats up and bends during overload, the tripping mechanism 2 is stuck and does not operate, which will cause heat to accumulate continuously, causing the conductive heat pipe 710 to heat up simultaneously.

[0048] Another scenario is that the circuit breaker trips due to a short circuit. At the moment of the short circuit, the large current drives the electromagnetic trigger unit 11 to operate. The push rod in the electromagnetic trigger unit 11 fails to push the tripping mechanism 2, which is stuck, to trip. At this time, due to the large current of the short circuit, both the bimetallic spring 12 and the conductive heat pipe 710 will heat up in a short time.

[0049] Both of the above situations will cause the conductive heat pipe 710 to heat up. The heating of the conductive heat pipe 710 causes the threshold for opening the temperature-controlled exhaust assembly to be lower than the threshold for triggering the tripping mechanism 2 by bending the bimetallic spring 12 due to heat. This ensures that the bimetallic spring 12 will preferentially trigger the tripping mechanism 2 under normal operating conditions. However, if the tripping mechanism 2 is stuck and the triggering force of the bimetallic spring 12 and the electromagnetic triggering unit 11 fails to drive the tripping mechanism 2, the conductive heat pipe 710 of the present invention will overheat, causing the temperature-controlled exhaust assembly to open and release the compressed gas in the compressed gas cylinder 7 into the conical nozzle 702.

[0050] refer to Figure 6 As shown, compressed gas is introduced between the first piston 503 and the second piston 701. At this time, the second piston 701 is stationary, while the first piston 503 moves to the right under the drive of the compressed gas. Under the forced pushing force of the compressed gas, the piston top shaft 505 drives the lever 5 past the dead point position with a great pushing force, causing the lever 5 to trip, thereby overcoming the jamming problem of the tripping mechanism 2 and improving safety.

[0051] During the process of the piston top shaft 505 pushing the lever 5, as the second piston 701 and the first piston 503 separate, the stage sealing shaft 705 is gradually pulled out from the stage blind groove 704. When the lever 5 passes the dead point position, the stage sealing shaft 705 is also completely pulled out from the stage blind groove 704. At this time, the compressed gas between the second piston 701 and the first piston 503 is injected into the air cylinder 501 through the radial nozzle 706, enters the gas nozzle 6 through the cylinder nozzle 506, and is ejected through the gas nozzle 6, so that the end of the moving contact 3 ejects a stronger airflow for arc blowing and heat dissipation, in order to deal with the serious heat accumulation problem caused by the sticking of the tripping mechanism 2.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pluggable circuit breaker, comprising a protective housing and a tripping mechanism installed inside the protective housing, characterized in that: The tripping mechanism is provided with a moving contact and the protective housing is provided with a stationary contact. The tripping mechanism drives the moving contact to move, so that the moving contact and the stationary contact can make or break contact, thereby realizing the state switching of the circuit breaker. The protective housing is also equipped with an arc-extinguishing chamber, a lever, and a rebound air cylinder unit. The lever is connected to the tripping mechanism to achieve mutual driving. The moving contact is provided with a gas nozzle; when the moving contact and the stationary contact are in contact and conducting, the lever squeezes the rebound gas cylinder unit. When the moving contact and the stationary contact separate, the rebound gas cylinder unit simultaneously loses the squeeze of the lever, generates positive pressure gas and inputs it into the gas nozzle, so that the gas nozzle blows gas to drive the electric arc generated when the moving contact and the stationary contact separate into the arc extinguishing chamber for arc extinguishing.

2. The pluggable circuit breaker according to claim 1, characterized in that: The protective shell has double-sided exhaust holes and a third exhaust hole on its surface, and a side channel is provided inside the protective shell. The double-sided exhaust holes are connected to the arc-extinguishing chamber, and the third exhaust hole is connected to the arc-extinguishing chamber through the side channel.

3. The pluggable circuit breaker according to claim 1, characterized in that: The rebound air cylinder unit includes an air cylinder section, an inward-folding pressure lip, and a first piston. The air cylinder section is fixedly mounted on the inner wall surface of the protective shell. An inward-folding pressure lip is provided at the end of the air cylinder section. The first piston is slidably mounted inside the air cylinder section. The first piston and the air cylinder section are in sealed contact. A drive spring is provided between the inward-folding pressure lip and the first piston.

4. The pluggable circuit breaker according to claim 3, characterized in that: A piston top shaft is fixedly installed on the first piston. The piston top shaft passes through the side wall of the protective shell and extends to the outside of the protective shell. The piston top shaft and the side wall of the protective shell are in sealed contact. The drive spring provides elastic pressure to the first piston, so that the first piston drives the piston top shaft to have an outward extension tendency. When the moving contact and the stationary contact are in contact and conducting, the lever presses against the piston top shaft, causing the piston top shaft to be in a retracted state. At this time, the drive spring is compressed. The outside of the air cylinder is provided with a cylinder nozzle that communicates with the air cylinder. The cylinder nozzle is connected to the gas injection hole through a hose.

5. The pluggable circuit breaker according to claim 4, characterized in that: The surface of the air cylinder is provided with a movable groove, and a vertical part is provided in the movable groove. A drive pressure rod is fixedly installed on the vertical part. A synchronous outer ring is sleeved on the outside of the air cylinder. The synchronous outer ring is fixedly installed with the vertical part. The axial movement of the synchronous outer ring drives the drive pressure rod to drive the first piston to move axially, thereby causing the piston top shaft to push the lever to trip.

6. The pluggable circuit breaker according to claim 5, characterized in that: A magnetic backplate is fixedly installed on the outer ring of the synchronization. A control electromagnet is installed inside the protective shell. By energizing the control electromagnet, the control electromagnet can generate magnetic force, thereby driving the magnetic backplate to move the outer ring of the synchronization axially, causing the lever to trip.

7. The pluggable circuit breaker according to claim 4, characterized in that: The air cylinder section is also equipped with a second piston, which is located between the first piston and the drive spring. A conical nozzle is fixedly provided on the surface of the second piston, and a gap air hole is opened through the surface of the second piston. The conical nozzle is connected to the gap between the second piston and the first piston through the gap air hole.

8. The pluggable circuit breaker according to claim 7, characterized in that: A stage blind groove is provided in the piston top shaft, and a stage sealing shaft is fixedly installed on the second piston. The stage sealing shaft is inserted into the stage blind groove, and a radiation nozzle is provided through the inner wall surface of the stage blind groove. When the stage sealing shaft is pulled out from the stage blind groove, the stage blind groove is connected to the inner cavity of the air cylinder through the radiation nozzle.

9. The pluggable circuit breaker according to claim 8, characterized in that: The protective shell also houses a compressed gas cylinder, which is equipped with a temperature-controlled exhaust assembly. The compressed gas cylinder contains compressed gas, and the temperature-controlled exhaust assembly is connected to the conical nozzle via a flexible hose. The temperature-controlled exhaust assembly releases the compressed gas from the compressed gas cylinder into the conical nozzle, driving the first piston and the second piston to move apart.

10. A control system for a pluggable circuit breaker, wherein the control system employs the pluggable circuit breaker as described in claim 6, characterized in that, The control system also includes an external power supply module, which supplies power to the control electromagnet, thereby controlling the plug-in circuit breaker to trip and disconnect.

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