Magnetic control type circuit breaker

Abstract

The application relates to the technical field of circuit breakers, and provides a magnetic control type circuit breaker, which comprises a box body, a solid-sealed pole, a magnetic control mechanism and an isolation knife switch mechanism. The solid-sealed pole comprises a pole body arranged at the top of the box body and a vacuum interrupter arranged in the box body. The moving end of the vacuum interrupter is connected with the magnetic control mechanism, so as to control the opening and closing of the vacuum interrupter. The magnetic control mechanism comprises a static iron core, a moving iron core and a closing spring. The moving iron core is connected with the moving end of the vacuum interrupter. The static iron core is fixedly arranged in the box body and located on the side of the moving iron core far away from the vacuum interrupter. The closing spring is arranged between the moving iron core and the static iron core, and is used for forcing the moving iron core to be always far away from the static iron core. At this time, the vacuum interrupter is in a closing state. When the static iron core is in an energized state, the vacuum interrupter is in an opening state. Therefore, the closing state of the vacuum interrupter can be maintained when power is cut off, the consumption of electric energy is reduced, and the power consumption cost is lowered.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, and more particularly to a magnetically controlled circuit breaker. Background Technology

[0002] Magnetic circuit breakers are electrical devices that use electromagnetic principles for circuit control and protection. They play a vital role in power systems and are widely used in all aspects of power generation, transmission, distribution, and consumption.

[0003] Chinese Patent CN118588492A discloses a magnetically controlled vacuum circuit breaker, comprising a housing, a solid-sealed pole, a magnetic control mechanism, and an isolating switch mechanism. The magnetic control mechanism includes a mounting bracket on the housing, a stationary iron core and a moving iron core mounted on the mounting bracket, and a tripping spring positioned between the stationary and moving iron cores. The stationary iron core is mounted above the moving iron core and includes a yoke, a magnet, and a coil, capable of generating a magnetic field when the coil is energized. One end of the tripping spring acts on the stationary iron core, and the other end acts on the moving iron core. When the magnetic control mechanism operates, the upper end of the moving iron core generates an upward attractive force. When this upward magnetic attractive force exceeds the elastic force of the tripping spring, the moving iron core overcomes the elastic force of the tripping spring under the magnetic force and attracts the stationary iron core, causing the upper end of the vacuum interrupter in the solid-sealed pole to move upward, thereby putting the vacuum interrupter in a closed state.

[0004] Regarding the aforementioned technical solutions, it is known that during the operation of the circuit breaker, the coil needs to be continuously energized to generate a magnetic field in order to maintain the attraction between the moving iron core and the stationary iron core, thereby maintaining the closed state of the vacuum interrupter. Based on this, the circuit breaker needs to continuously consume electrical energy during operation, increasing the cost of electricity, and needs to be improved. Utility Model Content

[0005] Based on this, this application provides a magnetically controlled circuit breaker that can maintain the closed state of the vacuum interrupter when power is off, thereby reducing power consumption and lowering electricity costs.

[0006] The magnetically controlled circuit breaker provided in this application adopts the following technical solution:

[0007] A magnetically controlled circuit breaker includes a housing, a solid-sealed pole, a magnetic control mechanism, and an isolating switch mechanism. The solid-sealed pole includes a pole body disposed on the top of the housing and a vacuum interrupter disposed inside the housing. The pole body is provided with an incoming terminal and an outgoing terminal. The stationary end of the vacuum interrupter passes through the pole body and is connected to the incoming terminal. The moving end of the vacuum interrupter is connected to the magnetic control mechanism to control the opening and closing of the vacuum interrupter.

[0008] The magnetic control mechanism includes a stationary iron core, a moving iron core, and a closing spring. The moving iron core is connected to the moving end of the vacuum interrupter. The stationary iron core is fixedly installed inside the housing and located on the side of the moving iron core away from the vacuum interrupter. The closing spring is located between the moving iron core and the stationary iron core to force the moving iron core to normally move away from the stationary iron core, at which time the vacuum interrupter is in the closed state. When the stationary iron core is energized, the vacuum interrupter is in the open state.

[0009] By adopting the above technical solution, this application provides a closing spring between the stationary iron core and the moving iron core. The elastic force of the closing spring acting on the moving iron core can keep the vacuum interrupter in a normally closed state. Based on this, the magnetically controlled circuit breaker does not need to continuously energize the stationary iron core during use, which can reduce energy consumption and lower electricity costs. In addition, when it is necessary to open the vacuum interrupter, the current flows through the coil of the stationary iron core by energizing the stationary iron core. The magnetic field generated inside the stationary iron core acts on the moving iron core, which can force the moving iron core to overcome the elastic force of the closing spring and move towards the stationary iron core, thus successfully realizing the opening action of the vacuum interrupter.

[0010] Optionally, the magnetic control mechanism also includes an upper plate for fixing the moving iron core and a lower plate for fixing the stationary iron core. Several movable pins are fixed on the side of the upper plate near the lower plate, and the lower plate is provided with movable insertion holes for the movable pins to pass through. The closing spring is sleeved on the movable pins and is located between the upper plate and the lower plate.

[0011] By adopting the above technical solution, the movable pin and the movable socket can be used to move the moving iron core vertically towards the stationary iron core, thus playing a guiding role; at the same time, the movable pin also serves as the mounting carrier for the closing spring, so that the closing spring can be smoothly installed between the moving iron core and the stationary iron core.

[0012] Optionally, the magnetic control mechanism also includes a holding mechanism for keeping the vacuum interrupter in the open state. The holding mechanism includes a ratchet plate and a pawl block. The ratchet plate is fixed to the upper base plate, and the side of the ratchet plate is provided with multiple ratchet teeth. The pawl block is rotatably mounted inside the housing, and a torsion spring is provided at the rotatable connection between the pawl block and the lower base plate. When the vacuum interrupter is in the open state, the torsion spring forces the pawl block against the ratchet teeth and is used to limit the retraction of the ratchet plate. The housing is also provided with a reset mechanism for forcing the pawl block to disengage from the ratchet teeth.

[0013] By adopting the above technical solution, when the stationary iron core is charged and the moving iron core moves towards the stationary iron core under the action of magnetic force, the ratchet plate can gradually approach and abut against the pawl block. The pawl block, under the reset action of the torsion spring, can abut and limit the ratchet plate's retraction, thereby restricting the moving iron core from moving away from the stationary iron core, keeping the vacuum interrupter in the open state. Furthermore, by forcing the pawl block to disengage from the ratchet through the reset mechanism, the moving iron core can automatically move away from the stationary iron core under the elastic force of the closing spring, thus achieving the reclosing of the vacuum interrupter.

[0014] Optionally, the reset mechanism includes a rotating shaft rotatably connected to the inside of the housing and a driving component for driving the rotating shaft to rotate. A linkage arm plate is fixedly sleeved on the outer periphery of the rotating shaft, and a moving link is movably connected to the end of the linkage arm plate. A push plate frame is connected to the top of the moving link. A truss rod is erected inside the housing, and the push plate frame is slidably sleeved on the truss rod. The moving direction of the push plate frame is perpendicular to the axial direction of the rotating shaft. When the rotating shaft rotates, the push plate frame forces the pawl block to move laterally and disengage from the ratchet.

[0015] By adopting the above technical solution, when the vacuum interrupter is in the open state, the rotating shaft is driven to rotate by controlling the drive component. Under the drive of the linkage arm plate and the moving link, the push plate frame can move on the truss rod, thereby forcing the pawl block to disengage from the ratchet part. At this time, the moving iron core can automatically move away from the stationary iron core under the elastic force of the closing spring, so that the vacuum interrupter returns to the closed state.

[0016] Optionally, the truss rod is slidably mounted with a sliding seat, and the pawl block and the return spring are both set on the sliding seat; the push plate frame has two side plates, each side plate is provided with a guide hole for the truss rod to pass through, and the two side plates abut against the two opposite sides of the sliding seat respectively.

[0017] By adopting the above technical solution, by having the two side plates on the push plate frame abut against the two opposite sides of the sliding seat, when the push plate frame moves, it can move the sliding seat along the truss rod, thereby allowing the pawl block to smoothly disengage from the ratchet.

[0018] Optionally, the end of the movable insert away from the upper substrate is provided with a threaded portion, and an adjusting nut for adjusting the travel distance of the upper substrate is threaded onto the threaded portion.

[0019] By adopting the above technical solution, the limit distance between the moving iron core and the stationary iron core can be changed by adjusting the threaded connection position of the adjusting nut in the threaded part, thereby adjusting the distance of the closing spring in the normal position. This ensures that the vacuum interrupter can close accurately while keeping the spring force of the closing spring within a suitable range.

[0020] Optionally, the stationary iron core includes a yoke, a magnet, and a coil, with a UPS power supply electrically connected to the coil fixed inside the enclosure.

[0021] By adopting the above technical solution, in the event of an external power outage, the electrical energy stored in the UPS power supply can be used to power the coil inside the static iron core, ensuring the normal opening action of the vacuum interrupter, which facilitates the inspection and maintenance of the line.

[0022] Optionally, the moving end of the vacuum interrupter is fixedly connected to an insulating rod, and the moving iron core is fixedly connected to the lower end of the insulating rod.

[0023] By adopting the above technical solution, the insulating tie rod is used to isolate the current between the moving iron core and the vacuum interrupter, thereby ensuring the normal use of the circuit breaker.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. By setting a closing spring, the elastic force of the closing spring acting on the moving iron core can keep the vacuum interrupter in the closed state under normal conditions, so that the magnetically controlled circuit breaker does not need to continuously energize the stationary iron core during use, which can reduce power consumption and reduce electricity costs.

[0026] 2. The ratchet plate and pawl block work together to restrict the moving iron core from moving away from the stationary iron core, so that the vacuum interrupter is kept in the open state, which facilitates inspection and maintenance when the circuit is de-energized.

[0027] 3. By setting up a push plate frame, when the rotating shaft rotates, the push plate frame is moved by the linkage arm plate and the moving linkage, which can force the pawl block to disengage from the ratchet part, so that the moving iron core can move away from the stationary iron core under the elastic force of the closing spring, so that the vacuum interrupter returns to the closing state. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of this embodiment;

[0029] Figure 2 This is a schematic diagram of the vacuum interrupter and the magnetic control mechanism in this embodiment;

[0030] Figure 3 This is a schematic diagram of the magnetic control mechanism, holding mechanism and reset mechanism in this embodiment;

[0031] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0032] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Truss rod; 12. Sliding seat; 13. Fixed rod; 2. Fixed pole; 21. Pole body; 22. Vacuum interrupter; 23. Incoming terminal; 24. Outgoing terminal; 25. Insulating pull rod; 3. Isolating switch mechanism; 4. Magnetic control mechanism; 41. Stationary iron core; 42. Moving iron core; 43. Closing spring; 44. Upper base plate; 441. Movable insertion post; 442. Screw 443. Adjusting nut; 45. Lower base plate; 451. Movable insertion hole; 5. Holding mechanism; 51. Racket plate; 511. Racket part; 52. Pad block; 521. Torsion spring; 6. Reset mechanism; 61. Rotating shaft; 62. Driving component; 63. Linkage arm plate; 631. Pin; 64. Moving link; 641. Waist-shaped hole; 65. Push plate frame; 651. Side plate part; 652. Guide hole. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0034] This application discloses a magnetically controlled circuit breaker.

[0035] Reference Figure 1 , Figure 2 A magnetically controlled circuit breaker includes a housing 1, a solid-sealed pole 2, a magnetic control mechanism 4, and an isolating switch mechanism 3. The solid-sealed pole 2 includes a pole body 21 fixed to the top of the housing 1 and a vacuum interrupter 22 disposed inside the housing 1. The pole body 21 has an outgoing terminal 24 on its side and an incoming terminal 23 on its top. The top of the vacuum interrupter 22 is the stationary end, which passes through the pole body 21 and is connected to the incoming terminal 23. The bottom of the vacuum interrupter 22 is the moving end, which is connected to an insulating rod 25. The insulating rod 25 is connected to the magnetic control mechanism 4, which controls the opening and closing of the vacuum interrupter 22.

[0036] Reference Figure 3 Specifically, the magnetic control mechanism 4 includes a stationary iron core 41, a moving iron core 42, a closing spring 43, an upper base plate 44, and a lower base plate 45. The upper base plate 44 is fixed to the lower end of the insulating pull rod 25, and the moving iron core 42 is fixed to the bottom of the upper base plate 44. A fixed rod 13 is fixedly mounted inside the housing 1. The axial direction of the fixed rod 13 is the same as the width direction of the housing 1. The lower base plate 45 is fixed to the fixed rod 13, and the stationary iron core 41 is fixed to the top of the lower base plate 45. Based on this, the stationary iron core 41 can be located on the side of the moving iron core 42 away from the vacuum interrupter 22.

[0037] A plurality of movable posts 441 are fixed on the side of the upper substrate 44 near the lower substrate 45. In this embodiment, the number of movable posts 441 is set to 4, and the 4 movable posts 441 are respectively disposed at the four corners of the upper substrate 44. It is understood that in other feasible embodiments, the number of movable posts 441 may also be 1, 2 or 3, and is not limited to the number provided in this embodiment.

[0038] Simultaneously refer to Figure 4 The lower substrate 45 has movable insertion holes 451, the number of which is equal to the number of movable insertion posts 441. Each movable insertion post 441 is inserted into a corresponding movable insertion hole 451. Each movable insertion post 441 has a threaded portion 442 at the end away from the upper substrate 44. The threaded portion 442 is threadedly connected to an adjusting nut 443. By changing the connection position of the adjusting nut 443 at the threaded portion 442, the normal distance between the upper substrate 44 and the lower substrate 45 can be changed, thereby adjusting the travel distance of the upper substrate 44.

[0039] There are four closing springs 43, which are respectively sleeved on four movable inserts 441. Each closing spring 43 is located between the upper base plate 44 and the lower base plate 45. One end of the closing spring 43 is pressed against the upper base plate 44 and the other end is pressed against the lower base plate 45. The closing spring 43 can generate an elastic force acting on the upper base plate 44, thereby forcing the upper base plate 44 to move away from the lower base plate 45 in a normal state, so that the moving iron core 42 is normally away from the stationary iron core 41, and the vacuum interrupter 22 can be normally in the closed state.

[0040] The stationary iron core 41 includes a yoke, a magnet, and a coil. Its specific structure is a conventional design in the field and is not the focus of this case. Therefore, it will not be described in detail here. A UPS power supply (not shown in the figure) is fixed inside the housing 1. The UPS power supply is electrically connected to the coil. When the line is de-energized, the UPS power supply can still charge the coil, thereby generating a magnetic field inside the coil. The bottom end of the moving iron core 42 is subjected to magnetic force in the magnetic field. The magnetic force generated can overcome the elastic force of the closing spring 43 and drive the upper plate 44 to move closer to the lower plate 45, thereby enabling the vacuum interrupter 22 to switch from the closed state to the open state.

[0041] Additionally, refer to Figure 4 The magnetic control mechanism 4 also includes a holding mechanism 5 for keeping the vacuum interrupter 22 in the open state. The holding mechanism 5 includes a ratchet plate 51 and a pawl block 52, wherein the ratchet plate 51 is fixed to the side of the upper base plate 44, and the side of the ratchet plate 51 is provided with a plurality of ratchet portions 511.

[0042] A truss rod 11 is fixedly mounted inside the housing 1. The axis of the truss rod 11 is in the same direction as the width of the housing 1. A sliding seat 12 is slidably mounted on the truss rod 11. A pawl block 52 is rotatably mounted on the sliding seat 12. A torsion spring 521 is installed at the rotatable connection between the pawl block 52 and the sliding seat 12. When the moving iron core 42 moves towards the stationary iron core 41 under the action of magnetic force, each ratchet tooth 511 can abut against the pawl block 52 in sequence. Under the elastic force of the torsion spring 521, the pawl block 52 can be kept at the abutment limit of the ratchet tooth 511 to limit the retraction of the ratchet plate 51 and prevent the vacuum interrupter 22 from being reclosed.

[0043] Back Figure 2 The housing 1 also includes a reset mechanism 6 for forcing the pawl block 52 to disengage from the ratchet tooth 511. The reset mechanism 6 includes a rotating shaft 61 rotatably connected to the inside of the housing 1 and a driving component 62 fixed to the inner wall of the housing 1. In this embodiment, the driving component 62 is a motor, and the driving component 62 is drivenly connected to the rotating shaft 61. (Refer to...) Figure 3 A linkage arm plate 63 is fixedly sleeved on the outer periphery of the rotating shaft 61. A movable connecting rod 64 is movably connected to one end of the linkage arm plate 63 away from the rotating shaft 61. A push plate frame 65 is vertically fixed to the top of the movable connecting rod 64. The push plate frame 65 can drive the sliding seat 12 to move, thereby forcing the pawl block 52 to move laterally and disengage from the ratchet part 511.

[0044] Specific reference Figure 4 The top of the push plate frame 65 is provided with two side plates 651, which are respectively located on two opposite sides of the push plate frame 65 and are integrally formed with the push plate frame 65. Each side plate 651 is provided with a guide hole 652, the inner diameter of which is equal to the outer diameter of the truss rod 11, so that the side plate 651 can be fitted onto the truss rod 11 and move along the axis of the truss rod 11. It should be noted that the two side plates 651 can respectively abut against the two opposite sides of the sliding seat 12, so that when the push plate frame 65 moves, it can drive the sliding seat 12 to move, thereby allowing the pawl block 52 to smoothly disengage from the ratchet part 511.

[0045] The movable connection between the moving link 64 and the linkage arm plate 63 is as follows: a pin 631 is inserted at the end of the linkage arm plate 63 away from the rotating shaft 61, and a waist-shaped hole 641 is provided at the end of the moving link 64 away from the push plate frame 65. The extension direction of the waist-shaped hole 641 is the same as the extension direction of the moving link 64. The pin 631 is inserted into the waist-shaped hole 641 and abuts against the inner wall of the waist-shaped hole 641. When the rotating shaft 61 rotates, the pin 631 can abut against the inner wall of the waist-shaped hole 641 and move the push plate frame 65, thereby driving the sliding seat 12 to move.

[0046] The implementation principle of a magnetically controlled circuit breaker according to an embodiment of this application is as follows:

[0047] In use, the magnetically controlled circuit breaker of this application maintains the vacuum interrupter 22 in a normally closed state through the elastic force of the closing spring 43 acting on the moving iron core 42, eliminating the need for continuous charging of the stationary iron core 41, thus reducing energy consumption and lowering electricity costs. When it is necessary to open the vacuum interrupter 22, current flows through the coil of the stationary iron core 41 by energizing it. The magnetic field generated inside the stationary iron core 41 acts on the moving iron core 42, forcing the moving iron core 42 to overcome the elastic force of the closing spring 43 and move towards the stationary iron core 41, thus smoothly realizing the opening action of the vacuum interrupter 22.

[0048] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A magnetically controlled circuit breaker, comprising a housing (1), a solid-sealed pole (2), a magnetic control mechanism (4), and an isolating switch mechanism (3), wherein the solid-sealed pole (2) comprises a pole body (21) disposed on the top of the housing (1) and a vacuum interrupter (22) disposed inside the housing (1), wherein the pole body (21) is provided with an incoming terminal (23) and an outgoing terminal (24), wherein the stationary end of the vacuum interrupter (22) passes through the pole body (21) and is connected to the incoming terminal (23), and the moving end of the vacuum interrupter (22) is connected to the magnetic control mechanism (4) for controlling the opening and closing of the vacuum interrupter (22); Its features are: The magnetic control mechanism (4) includes a stationary iron core (41), a moving iron core (42), and a closing spring (43). The moving iron core (42) is connected to the moving end of the vacuum interrupter (22). The stationary iron core (41) is fixedly installed inside the housing (1) and located on the side of the moving iron core (42) away from the vacuum interrupter (22). The closing spring (43) is installed between the moving iron core (42) and the stationary iron core (41) to force the moving iron core (42) to normally move away from the stationary iron core (41). At this time, the vacuum interrupter (22) is in the closed state. When the stationary iron core (41) is energized, the vacuum interrupter (22) is in the open state.

2. The magnetically controlled circuit breaker according to claim 1, characterized in that: The magnetic control mechanism (4) further includes an upper base plate (44) for fixing the moving iron core (42) and a lower base plate (45) for fixing the stationary iron core (41). The upper base plate (44) has a plurality of movable pins (441) fixed on the side near the lower base plate (45). The lower base plate (45) has movable insertion holes (451) for the movable pins (441) to pass through. The closing spring (43) is sleeved on the movable pins (441) and the closing spring (43) is located between the upper base plate (44) and the lower base plate (45).

3. The magnetically controlled circuit breaker according to claim 2, characterized in that: The magnetic control mechanism (4) further includes a holding mechanism (5) for keeping the vacuum interrupter (22) in the open state. The holding mechanism (5) includes a ratchet plate (51) and a pawl block (52). The ratchet plate (51) is fixed to the upper base plate (44), and the side of the ratchet plate (51) is provided with a plurality of ratchet portions (511). The pawl block (52) is rotatably mounted inside the housing (1), and a torsion spring (521) is provided at the rotatable connection between the pawl block (52) and the lower base plate (45). When the vacuum interrupter (22) is in the open state, the torsion spring (521) forces the pawl block (52) to abut against the ratchet portion (511) and is used to limit the retraction of the ratchet plate (51). The housing (1) is also provided with a reset mechanism (6) for forcing the pawl block (52) to disengage from the ratchet portion (511).

4. The magnetically controlled circuit breaker according to claim 3, characterized in that: The reset mechanism (6) includes a rotating shaft (61) rotatably connected inside the housing (1) and a driving component (62) for driving the rotating shaft (61) to rotate. A linkage arm plate (63) is fixedly sleeved on the outer periphery of the rotating shaft (61). A moving link (64) is movably connected to the end of the linkage arm plate (63). A push plate frame (65) is connected to the top of the moving link (64). A truss rod (11) is erected inside the housing (1). The push plate frame (65) is slidably sleeved on the truss rod (11), and the moving direction of the push plate frame (65) is perpendicular to the axial direction of the rotating shaft (61). When the rotating shaft (61) rotates, the push plate frame (65) forces the pawl block (52) to move laterally and disengage from the ratchet part (511).

5. The magnetically controlled circuit breaker according to claim 4, characterized in that: The truss rod (11) is slidably mounted with a sliding seat (12), and the pawl block (52) and the return spring are both disposed on the sliding seat (12); the push plate frame (65) has two side plate portions (651), each of the side plate portions (651) is provided with a guide hole (652) for the truss rod (11) to pass through, and the two side plate portions (651) respectively abut against the two opposite sides of the sliding seat (12).

6. The magnetically controlled circuit breaker according to claim 2, characterized in that: The movable insert (441) has a threaded portion (442) at one end away from the upper substrate (44), and the threaded portion (442) is threaded with an adjusting nut (443) for adjusting the travel distance of the upper substrate (44).

7. The magnetically controlled circuit breaker according to claim 1, characterized in that: The static iron core (41) includes a yoke, a magnet and a coil, and a UPS power supply electrically connected to the coil is fixed inside the housing (1).

8. The magnetically controlled circuit breaker according to claim 1, characterized in that: An insulating pull rod (25) is fixedly connected to the moving end of the vacuum interrupter (22), and the moving iron core (42) is fixedly connected to the lower end of the insulating pull rod (25).

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