Plug-in circuit breaker switch

Abstract

The invention provides a plug-in type circuit breaker switch, and belongs to the technical field of circuit breakers, the plug-in type circuit breaker switch comprises a switch module and a mounting rack, the switch module comprises a circuit breaker body and a base, and the plug-in type circuit breaker switch further comprises a sealing gas guide assembly and an induction arc extinguishing assembly; when the circuit breaker is connected and disconnected, air pressure in the movable cavity is changed by moving the arc extinguishing cover, airflow is guided through the air guide channel to extinguish arcs and clean the conducting rod, the trapezoidal air guide channel optimizes the airflow effect, arc extinguishing is timely and effective, meanwhile, when the circuit breaker is disconnected, the arc extinguishing cover shields the conducting rod to prevent electric shock, and the limiting plate triggers the tripping switch to protect circuit equipment, so that the circuit breaker is protected. The combination of arc extinguishing and protection functions is realized, and miniaturization and integrated design of the circuit breaker is also facilitated; the SF6 gas arc extinguishing function and the opening and closing action are combined, and the SF6 gas is quickly sent to the arc position by utilizing the movable cavity and the gas guide channel according to the induction of the temperature sensor to the arc temperature change, so that quick and accurate arc extinguishing is realized, and the opening and closing performance and reliability of the circuit breaker are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and more particularly, to a plug-in circuit breaker switch. Background Art

[0002] In the field of power systems, as a key electrical device, the plug-in circuit breaker is widely used in various low-voltage switch cabinets, undertaking the important responsibilities of controlling and protecting circuits. After long-term development, the traditional plug-in circuit breaker technology has formed a relatively mature system. It usually adopts the method of fixedly connecting the plug-in circuit breaker to the base, and realizes the opening and closing operations of the circuit breaker by installing a special handle mechanism.

[0003] The handle mechanism adopted by the traditional plug-in circuit breaker is used for opening and closing operations. This design requires additional space in the low-voltage switch cabinet. With the continuous improvement of the integration degree of power equipment, the internal space of the low-voltage switch cabinet becomes increasingly tight. The existence of the handle mechanism makes the originally limited space even narrower. For example, in some compact low-voltage switch cabinets, the handle mechanism may interfere with other electrical components, affecting the wiring and component installation in the switch cabinet, reducing the space utilization rate, and being unfavorable to the miniaturization and integration development of the electrical system; the existing protection measures of the plug-in circuit breaker mainly rely on the conventional housing, and the protection effect against external impurities such as dust and water vapor is limited. In some harsh working environments, such as humid basements and dusty industrial workshops, dust and water vapor are easy to enter the interior of the circuit breaker through the gaps in the housing and accumulate on the surface of the conductive components. Dust may affect the conductivity, and water vapor may cause a decrease in electrical insulation performance, increasing the risk of electrical faults such as short circuits, seriously threatening the normal operation and service life of power equipment.

[0004] How to invent a plug-in circuit breaker switch to solve these problems has become an urgent problem for those skilled in the art. Summary of the Invention

[0005] To make up for the above deficiencies, the present invention provides a plug-in circuit breaker switch, aiming to solve the problems mentioned in the above background.

[0006] The present invention is implemented as follows: The present invention provides a plug-in circuit breaker switch, including a switch module and a mounting bracket. The switch module includes a circuit breaker body and a base. A conductive sleeve and an outgoing board are installed on the base. A protective cover is snap-fitted on the circuit breaker body. A circuit breaker operating handle is provided on the front side of the circuit breaker body. A conductive rod matching the conductive sleeve is installed on the circuit breaker body. The base is installed on the mounting bracket through mounting bolts. A closing and opening mechanism is provided on the rear side of the base. It further includes: A sealed air guiding assembly: The sealed air guiding assembly is arranged on the circuit breaker body and surrounds the conductive rod; Arc induction extinguishing component: The arc induction extinguishing component is arranged inside the sealed air guiding component.

[0007] Preferably, the opening and closing mechanism includes a micro electric cylinder fixed to the rear side of the base. A piston rod is arranged inside the micro electric cylinder. A through hole matching the piston rod is arranged on the base. A receiving cavity is formed at the end of the piston rod. A fixed magnetic plate is fixedly arranged in the middle of the receiving cavity. An active magnetic plate is arranged in each of the receiving cavities above and below the fixed magnetic plate. A positioning hole matching the end of the piston rod and the active magnetic plate is arranged on the rear side of the circuit breaker body.

[0008] Preferably, the two active magnetic plates are symmetrically distributed. The magnetic properties of the opposite surfaces of the active magnetic plates and the fixed magnetic plate are the same. The cross section of the active magnetic plate is arranged in a U-shaped manner.

[0009] Preferably, the sealed air guiding component includes an arc extinguishing cover, an active cavity arranged inside the circuit breaker body, and an inner support sleeve fixedly arranged in the active cavity. One end of the arc extinguishing cover is located inside the active cavity, and the other end is located outside the circuit breaker body. A limiting plate is fixedly connected to the end of the arc extinguishing cover located inside the active cavity. The limiting plate matches the cross section of the inner cavity of the active cavity. A positioning ring is fixedly connected to the outer side of the end of the arc extinguishing cover located outside the circuit breaker body. An annular airbag is fixedly installed inside the positioning ring. A spring I is fixedly connected to the inner wall of the active cavity. The end of the spring I is fixedly connected to the limiting plate. A plurality of air guiding channels are annularly arranged on the inner wall of the arc extinguishing cover. The cross section of the air guiding channel is a trapezoidal structure without a bottom. The outer end of the air guiding channel faces the side wall of the conductive rod.

[0010] Preferably, the outer end of the inner support sleeve is flush with the rear side of the circuit breaker body. The conductive rod passes through the inside of the inner support sleeve. The arc extinguishing cover is arranged in a cylindrical shape. A notch matching the arc extinguishing cover is arranged on the rear side of the circuit breaker body. The inner support sleeve is located at the exact center of the notch. The arc extinguishing cover passes through the gap between the inner support sleeve and the notch. The arc extinguishing cover is slidably and sealingly connected with the inner support sleeve and the notch. When the spring I is in the initial state, the arc extinguishing cover can completely cover the outer end of the conductive rod, and the limiting plate abuts against the inner wall of the active cavity.

[0011] Preferably, a plurality of jacks are arranged on the rear side of the positioning ring corresponding to the annular airbag. The plurality of jacks are annularly and equidistantly distributed. A convex column matching the jacks is fixedly arranged on the rear side wall of the circuit breaker body. The length of the convex column is greater than the length of the jack.

[0012] Preferably, one side of the positioning ring when the circuit breaker body is connected to the base abuts against the side wall of the base, and the other side abuts against the side wall of the circuit breaker body, and the annular airbag is in a saturated state. The inner end of the air guide channel when the circuit breaker body is connected to the base is inside the movable cavity, and the inner end of the air guide channel when the circuit breaker body is disconnected from the base is blocked by the inner support sleeve.

[0013] Preferably, the sealed air guide assembly further includes an installation cavity opened in the side wall of the movable cavity near the convex post. A trip switch and a second spring are fixedly installed inside the installation cavity. The trip switch is electrically connected to the operating mechanism of the circuit breaker operating handle. The end of the second spring is fixedly connected to a pressure rod. The pressure rod in the initial state of the first spring contacts the trip switch under the push of the limit plate.

[0014] Preferably, the induction arc extinguishing assembly includes a gas storage box fixedly installed in the movable cavity. A temperature sensor is installed inside the gas storage box. The limit plate is provided with a through hole matching the contour of the gas storage box. A solenoid valve is installed on the side wall of the gas storage box. The side wall of the gas storage box facing the base is provided with an air supplement port. A plug is inserted and installed in the air supplement port. The inside of the gas storage box is pre-filled with high-pressure SF6 gas.

[0015] Preferably, the solenoid valve is electrically connected to the temperature sensor. The housing of the gas storage box and the inner support sleeve are both made of high thermal conductivity alloy material.

[0016] The beneficial effects of the present invention are: 1. The arc extinguishing process is closely combined with the connection operation of the circuit breaker. By using the movement of the arc extinguishing cover and the gas in the movable cavity during the connection and disconnection processes to generate an air flow, the entire arc extinguishing device has a compact structure, which not only realizes the arc extinguishing function but also does not increase excessive structural complexity and equipment volume, facilitating the miniaturization and integration design of the circuit breaker and meeting the requirements of modern electrical equipment for space utilization. During the connection and disconnection processes of the circuit breaker, the movement of the arc extinguishing cover causes a change in the air pressure in the movable cavity, and then the air flow is guided through the air guide channel to extinguish the arc around the conductive rod, accelerating the arc extinguishing, while cleaning the impurities on the surface of the conductive rod, improving the working performance and lifespan of the conductive rod. The trapezoidal structure of the air guide channel optimizes the air flow direction and the effect on the arc, and has high timeliness and effectiveness of arc extinguishing. When the circuit breaker is disconnected, the limit plate will also push the pressure rod to trigger the trip switch, automatically cutting off the circuit in time to protect the circuit and equipment from the influence of faults, improving the safety of the equipment. And when the circuit breaker is disconnected, the arc extinguishing cover blocks the outer end of the conductive rod under the action of the spring, preventing accidental electric shock during personnel maintenance.

[0017] 2. The arc extinguishing function of SF6 gas is closely combined with the opening and closing actions of the circuit breaker, forming an efficient arc extinguishing system. This system can automatically sense the temperature change generated by the arc and respond quickly. By using the movable cavity and the gas guiding channel to direct the gas flow, it can deliver SF6 gas with good arc extinguishing performance to the designated position at the moment the arc is generated, achieving rapid and effective arc extinguishing, protecting the conductive components from arc ablation, improving the opening and closing performance and reliability of the circuit breaker, and ensuring the normal operation of the circuit breaker.

[0018] 3. The opening and closing mechanism driven by a micro electric cylinder for the piston rod does not require the installation of a traditional opening and closing handle mechanism, making the space layout in the low-voltage switchgear more reasonable, effectively avoiding the problem of narrow space, and having obvious advantages in space utilization. Users do not need to directly apply a large force to plug and unplug the circuit breaker, reducing the effort of plugging and unplugging, avoiding inaccuracies caused by difficult operation, and improving the operation experience and accuracy. The sealing structure composed of an arc extinguishing cover, a positioning ring, an annular airbag, convex columns, and jacks can effectively block dust and water vapor from entering the conductive connection, prevent insulation performance degradation from causing failures, extend the service life of the equipment, and this sealing structure utilizes the elasticity of the annular airbag to adapt to different installation situations and dimensional deviations, with simple maintenance and convenient replacement of the airbag. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0020] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the rear structural schematic diagram of the present invention; Figure 3 is the sectional structural schematic diagram when the circuit breaker body of the present invention is connected to the base; Figure 4 is the Figure 3 enlarged structural schematic diagram at position A in the present invention; Figure 5 is the Figure 4 enlarged structural schematic diagram at position B in the present invention; Figure 6 is the sectional right view structural schematic diagram when the circuit breaker body of the present invention is connected to the base; Figure 7 is the structural schematic diagram when the circuit breaker body of the present invention is disconnected from the base; Figure 8 is the structural schematic diagram of the circuit breaker body of the present invention; Figure 9 It is a schematic structural view of the base of the present invention; Figure 10 It is a schematic cross-sectional structural view when the circuit breaker body of the present invention is disconnected from the base; Figure 11 It is of the present invention Figure 10 Schematic enlarged view of part C; Figure 12 It is a schematic right cross-sectional structural view when the circuit breaker body of the present invention is connected to the base; Figure 13 It is a schematic cross-sectional structural view of the circuit breaker body of the present invention; Figure 14 It is a schematic structural view of the arc extinguishing cover of the present invention.

[0021] In the figure: 1. Circuit breaker body; 2. Base; 3. Mounting frame; 4. Protective cover; 5. Arc extinguishing cover; 6. Air storage box; 7. Temperature sensor; 8. Micro electric cylinder; 9. Annular airbag; 10. Switch module; 11. Circuit breaker operating handle; 12. Activity cavity; 13. Inner support sleeve; 14. Conductive rod; 15. Convex column; 21. Conductive sleeve; 22. Power output plate; 31. Mounting bolt; 51. Air guide channel; 52. Spring I; 53. Limiting plate; 54. Positioning ring; 61. Solenoid valve; 62. Air replenishing port; 81. Piston rod; 82. Positioning hole; 121. Mounting cavity; 531. Through port; 541. Insertion hole; 621. Plug; 811. Accommodation cavity; 812. Fixed magnetic plate; 813. Movable magnetic plate; 1211. Tripping switch; 1212. Spring II; 1213. Pressing rod. Specific embodiments

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Example 1, refer to Figures 1 - 12, A pluggable circuit breaker switch, comprising a switch module 10 and a mounting bracket 3. The switch module 10 includes a circuit breaker body 1 and a base 2. A conductive sleeve 21 and a power output board 22 are mounted on the base 2. A protective cover 4 is snap-fitted and mounted on the circuit breaker body 1. A circuit breaker operating handle 11 is provided on the front side of the circuit breaker body 1. A conductive rod 14 matching the conductive sleeve 21 is mounted on the circuit breaker body 1. Through the contact between the conductive rod 14 and the conductive sleeve 21, effective electrical connection is achieved. The base 2 is mounted on the mounting bracket 3 through mounting bolts 31. A closing and opening mechanism is provided on the rear side of the base 2. Through the closing and opening mechanism, the connection and disconnection between the circuit breaker body 1 and the base 2 are realized. It further includes: A sealed air guiding component: The sealed air guiding component is arranged on the circuit breaker body 1 and surrounds the conductive rod 14; An induction arc extinguishing component: The induction arc extinguishing component is arranged inside the sealed air guiding component.

[0024] Furthermore, the closing and opening mechanism includes a micro electric cylinder 8 fixed on the rear side of the base 2. A piston rod 81 is arranged inside the micro electric cylinder 8. A through hole matching the piston rod 81 is provided on the base 2. A receiving cavity 811 is opened at the end of the piston rod 81. A fixed magnetic plate 812 is fixedly arranged in the middle of the receiving cavity 811. An active magnetic plate 813 is arranged in each of the receiving cavities 811 above and below the fixed magnetic plate 812. A positioning hole 82 matching the end of the piston rod 81 and the active magnetic plate 813 is provided on the rear side of the circuit breaker body 1.

[0025] It should be noted that the two active magnetic plates 813 are symmetrically distributed. The magnetic properties of the opposite surfaces of the active magnetic plates 813 and the fixed magnetic plate 812 are the same. The cross-section of the active magnetic plate 813 is arranged in a U-shaped manner. Due to the same magnetic properties of the opposite surfaces of the active magnetic plates 813 and the fixed magnetic plate 812, the two active magnetic plates 813 will be pushed apart to both sides under the action of magnetic force and tightly cooperate with the positioning hole 82 to realize the stable connection between the circuit breaker body 1 and the piston rod 81. When it is necessary to disassemble and replace the circuit breaker body 1, the operator presses the active magnetic plate 813, overcomes the magnetic repulsion force, makes the active magnetic plate 813 return to the receiving cavity 811, releases the tight cooperation with the positioning hole 82, and thus easily unlocks and removes the circuit breaker body 1 from the piston rod 81; when it is necessary to disconnect, the micro electric cylinder 8 drives the piston rod 81 to extend, and the piston rod 81 drives the circuit breaker body 1 to separate from the base 2. When it is necessary to connect, only need to control the micro electric cylinder 8 to contract the piston rod 81.

[0026] Further, the airtight air guiding assembly includes an arc extinguishing cover 5, a movable cavity 12 arranged inside the circuit breaker body 1, and an inner support sleeve 13 fixedly arranged inside the movable cavity 12. One end of the arc extinguishing cover 5 is located inside the movable cavity 12, and the other end is located outside the circuit breaker body 1. A limiting plate 53 is fixedly connected to the end of the arc extinguishing cover 5 located inside the movable cavity 12. The limiting plate 53 matches the cross-section of the inner cavity of the movable cavity 12. A positioning ring 54 is fixedly connected to the outer side of the end of the arc extinguishing cover 5 located outside the circuit breaker body 1. An annular airbag 9 is fixedly installed inside the positioning ring 54. A first spring 52 is fixedly connected to the inner wall of the movable cavity 12. The end of the first spring 52 is fixedly connected to the limiting plate 53. A plurality of air guiding channels 51 are annularly formed on the inner wall of the arc extinguishing cover 5. The cross-section of the air guiding channel 51 is a trapezoidal structure without a bottom. The outer end of the air guiding channel 51 faces the side wall of the conductive rod 14. The function of the arc extinguishing cover 5 is to guide the airflow to blow the arc around the conductive rod 14 during the opening and closing of the circuit breaker, assist in arc extinguishing, and at the same time play a role in protecting the conductive rod 14 to a certain extent.

[0027] It should be noted that the outer end of the inner support sleeve 13 is flush with the rear side of the circuit breaker body 1. The conductive rod 14 passes through the inside of the inner support sleeve 13. The arc extinguishing cover 5 is arranged in a cylindrical shape. A notch matching the arc extinguishing cover 5 is provided on the rear side of the circuit breaker body 1. The inner support sleeve 13 is located at the exact center of the notch. The arc extinguishing cover 5 passes through the gap between the inner support sleeve 13 and the notch. The arc extinguishing cover 5 is slidably and hermetically connected with the inner support sleeve 13 and the notch. The arc extinguishing cover 5 in the initial state of the first spring 52 can completely cover the outer end of the conductive rod 14 to play a protective role, and the limiting plate 53 abuts against the inner wall of the movable cavity 12.

[0028] A plurality of jacks 541 are provided on the rear side of the positioning ring 54 corresponding to the annular airbag 9. The plurality of jacks 541 are annularly and equidistantly distributed. A convex column 15 matching the jacks 541 is fixedly provided on the rear side wall of the circuit breaker body 1. The length of the convex column 15 is greater than the length of the jacks 541 to ensure that the part of the convex column 15 exposed from the jacks 541 can effectively act on the annular airbag 9, so that it can be effectively inflated, thereby improving the sealing performance at the connection between the conductive sleeve 21 and the conductive rod 14. When the circuit breaker body 1 is connected to the base 2, one side of the positioning ring 54 abuts against the side wall of the base 2, and the other side abuts against the side wall of the circuit breaker body 1. And the annular airbag 9 is in a saturated state to play a good sealing role, preventing dust, water vapor, etc. from entering the connection between the conductive sleeve 21 and the conductive rod 14. When the circuit breaker body 1 is connected to the base 2, the inner end of the air guiding channel 51 is located inside the movable cavity 12. When the circuit breaker body 1 is disconnected from the base 2, the inner end of the air guiding channel 51 is blocked by the inner support sleeve 13. The inner support sleeve 13 not only provides support and protection for the conductive rod 14, but also blocks the inner end of the air guiding channel 51 when the circuit breaker is disconnected to prevent foreign impurities from entering the movable cavity 12.

[0029] Further, the sealed air guiding assembly further includes an installation cavity 121 formed inside the side wall of the movable cavity 12 near the convex column 15. A trip switch 1211 and a second spring 1212 are fixedly installed inside the installation cavity 121. The trip switch 1211 is electrically connected to the operating mechanism of the circuit breaker operating handle 11. The end of the second spring 1212 is fixedly connected to a pressure rod 1213. When the first spring 52 is in the initial state, the pressure rod 1213 is pushed by the limit plate 53 to contact the trip switch 1211, thereby automatically triggering a tripping operation to protect the safety of the circuit and equipment.

[0030] In this embodiment, first, disconnect the power supply, fix the base 2 to the mounting bracket 3 through the mounting bolts 31, then connect the power output board 22 to the corresponding components, control the micro electric cylinder 8 to extend the piston rod 81, and the operator presses the movable magnetic plate 813 to overcome the magnetic repulsion force between the movable magnetic plate 813 and the fixed magnetic plate 812, so that the movable magnetic plate 813 returns to the receiving cavity 811. Install the circuit breaker body 1 at the end of the piston rod 81, align the positioning hole 82 with the end of the piston rod 81. Since the opposite surfaces of the movable magnetic plate 813 and the fixed magnetic plate 812 have the same magnetism, the magnetic force of like poles repelling each other causes the two movable magnetic plates 813 to expand to both sides and closely fit the inner wall of the positioning hole 82. In this way, the fixation between the circuit breaker body 1 and the piston rod 81 is completed. At this time, control the micro electric cylinder 8 to contract, and the conductive rod 14 can be inserted into the conductive sleeve 21 to achieve electrical connection, completing the connection between the circuit breaker body 1 and the base 2.

[0031] When it is necessary to disconnect the connection, control the micro electric cylinder 8 to drive the piston rod 81 to extend. The piston rod 81 drives the circuit breaker body 1 to separate from the base 2. During this process, the conductive rod 14 is pulled out of the conductive sleeve 21, thus cutting off the electrical connection. However, at this time, the end of the piston rod 81 is still inserted into the positioning hole 82 at the rear of the circuit breaker body 1. Only through the extension of the piston rod 81, the relative separation between the circuit breaker body 1 and the base 2 is realized, maintaining the connection state between the piston rod 81 and the circuit breaker body 1.

[0032] When it is necessary to disassemble and replace the circuit breaker body 1, control the piston rod 81 to extend, disconnect the connection between the circuit breaker body 1 and the base 2, and then the operator presses the movable magnetic plate 813 again to overcome the magnetic repulsion force between the movable magnetic plate 813 and the fixed magnetic plate 812, so that the movable magnetic plate 813 returns to the receiving cavity 811, releasing the cooperation between the movable magnetic plate 813 and the positioning hole 82. At this time, the circuit breaker body 1 can be easily removed from the piston rod 81 to complete the disassembly of the circuit breaker body 1 for replacement operation.

[0033] The plug-in circuit breaker switch of the present application adopts a breaking and closing mechanism driven by a micro electric cylinder 8 for the piston rod 81 to realize the connection and disconnection between the circuit breaker body 1 and the base 2. Compared with the traditional method of using a handle mechanism to switch the circuit breaker, it does not require additional space to install the handle mechanism, which makes the space layout in the low-voltage switchgear more reasonable and will not cause narrow space due to the handle mechanism. Therefore, it has obvious advantages in space utilization. Moreover, it does not require the user to directly apply a large force to plug and unplug the circuit breaker, greatly reducing the effort of plugging and unplugging and avoiding operation difficulties and inaccuracies caused by the strenuous plugging and unplugging.

[0034] The arc extinguishing cover 5, the positioning ring 54, the annular airbag 9, the convex column 15 and the jack 541 together form a sealing structure. When the circuit breaker body 1 is connected to the base 2, the convex column 15 is inserted into the jack 541 and squeezes the annular airbag 9 to make it in a saturated state. At this time, one side of the positioning ring 54 abuts against the side wall of the base 2, and the other side abuts against the side wall of the circuit breaker body 1, forming a sealed space. This sealing method can effectively prevent external impurities such as dust and water vapor from entering the connection between the conductive sleeve 21 and the conductive rod 14. The entry of dust and water vapor may cause a decrease in the insulation performance of the electrical connection part, leading to short circuits or other electrical faults. Good sealing can ensure the long-term stable operation of the connection part and extend the service life of the equipment. Compared with some traditional sealing methods, the elastic sealing of the annular airbag 9 in the present invention can better adapt to different installation situations and slight dimensional deviations. Even if the surface of the base 2 is somewhat uneven, the compression deformation of the annular airbag 9 can ensure the sealing effect. The maintenance of this sealing structure is relatively simple. If the annular airbag 9 ages or is damaged, it is relatively convenient to replace, and it does not require large-scale disassembly and adjustment of the entire circuit breaker structure.

[0035] During the connection process between the circuit breaker body 1 and the base 2, one end of the arc extinguishing cover 5 contacts the side wall of the base 2. As the conducting rod 14 is inserted, the other end of the arc extinguishing cover 5 continuously squeezes the first spring 52, and compresses the space inside the movable cavity 12 through the limit plate 53. The gas inside the movable cavity 12 flows out through the air guide channel 51 after being compressed. During this process, the air flow moves along with the arc extinguishing cover 5, and can comprehensively blow the possible arc on the conducting rod 14. This comprehensive blowing method ensures that all parts of the arc can be affected by the air flow, making it fully stretched and cooled, accelerating the arc extinguishing process, improving the arc extinguishing effect, and at the same time, can also clean the surface of the conducting rod 14. During the process of blowing and extinguishing the arc, the air flow can also clean the surface of the conducting rod 14, and can remove possible impurities, dust, etc. on the surface of the conducting rod 14, keeping the surface of the conducting rod 14 clean, which helps to maintain good electrical contact, reduce problems such as increased contact resistance and heat generation caused by surface impurities, and thus improves the working performance and service life of the conducting rod 14; the cross-section of the air guide channel 51 is a trapezoidal structure without a bottom. This design helps to guide the direction of the air flow and enhance the effect of the air flow on the arc. This arc extinguishing method is carried out in real time during the connection process of the circuit breaker, and can suppress and extinguish the arc at the initial stage of its generation, improving the timeliness and effectiveness of arc extinguishing.

[0036] When the circuit breaker body 1 is disconnected from the base 2, the first spring 52 returns to its initial state. Under the action of the first spring 52, the arc extinguishing cover 5 completely shields the outer end of the conducting rod 14, playing a physical protection role to prevent accidental electric shock to personnel and ensuring operation safety. During this reset process, during the reset process of the arc extinguishing cover 5, the internal space of the movable cavity 12 increases for the suction action. This suction action will suck away ions, heat, and some tiny particles generated by the residual arc near the conducting rod 14, helping to further clean the environment around the conducting rod 14. Even in the disconnected state, it can deal with the possible residual influence of the arc, reducing the risk of arc reignition or electrical failure caused by residual substances during the next connection. At the same time, the suction action may also take away heat to a certain extent, playing a cooling role for the conducting rod 14 and helping it to maintain a good working state. At this time, the inner end of the air guide channel 51 is blocked by the inner support sleeve 13 to prevent external impurities from entering the movable cavity 12. At the same time, under the push of the first spring 52, the limit plate 53 pushes the pressure rod 1213 into contact with the trip switch 1211, triggering the trip operation to cut off the circuit and protect the safety of the circuit and equipment.

[0037] The arc extinguishing process is closely combined with the connection operation of the circuit breaker. By utilizing the movement of the arc extinguishing cover 5 and the gas in the movable cavity 12 during the connection and disconnection processes to generate an air current, there is no need for an additional complex power device to drive the generation of the air current. This makes the entire arc extinguishing device structurally compact, achieving both the arc extinguishing function without adding excessive structural complexity and equipment volume, which is beneficial to the miniaturization and integrated design of the circuit breaker and meets the requirements of modern electrical equipment for space utilization. The design of the air guiding channel 51 can guide the air current to blow the arc and impurities around the conducting rod 14 during the opening and closing processes, assisting in arc extinguishing, reducing the ablation of the conducting rod 14 and the conducting sleeve 21 by the arc, and improving the opening and closing performance and reliability of the circuit breaker. When the circuit breaker is disconnected, the limiting plate 53 pushes the pressure rod 1213 to trigger the trip switch 1211, automatically cutting off the circuit, which can promptly protect the circuit and equipment from the influence of faults and improve the safety of the equipment.

[0038] Embodiment 2. Refer to Figures 3 - 14 , the induction arc extinguishing assembly includes a gas storage box 6 fixedly installed in the movable cavity 12. A temperature sensor 7 is installed inside the gas storage box 6 to monitor the temperature change inside the gas storage box 6 in real time. The change in temperature can reflect whether there is abnormal heat generation inside the circuit breaker, and abnormal heat generation is often related to the generation and existence of the arc. A through hole 531 matching the contour of the gas storage box 6 is provided on the limiting plate 53. A solenoid valve 61 is installed on the side wall of the gas storage box 6. A gas replenishing port 62 is provided on the side wall of the gas storage box 6 facing the base 2 for replenishing SF6 gas into the gas storage box 6 when necessary to maintain the pressure and quantity of the gas inside the gas storage box 6. A plug 621 is inserted and installed in the gas replenishing port 62 to play a sealing role and prevent gas leakage. The inside of the gas storage box 6 is pre-filled with high-pressure SF6 gas.

[0039] It should be noted that the solenoid valve 61 is electrically connected to the temperature sensor 7 and decides whether to open according to the signal transmitted by the temperature sensor 7, thereby controlling the release of SF6 gas. The housing of the gas storage box 6 and the inner support sleeve 13 are both made of high thermal conductivity alloy materials (such as high thermal conductivity copper-nickel alloy, etc.), which helps to quickly conduct heat, enabling the temperature sensor 7 to more timely and accurately sense the temperature change related to the arc.

[0040] In this embodiment, during the opening and closing processes of the circuit breaker, if an arc is generated, the conducting rod 14 will generate high temperature due to arc discharge. This high temperature is transmitted to the inner support sleeve 13 and then through the inner support sleeve 13 to the movable cavity 12. At this time, the heat is quickly conducted to the inside of the gas storage box 6. After the temperature sensor 7 in the gas storage box 6 senses the temperature rise and reaches the preset threshold, it sends a signal to the solenoid valve 61. After receiving the signal, the solenoid valve 61 opens, and the high-pressure SF6 gas in the gas storage box 6 flows out. The flowing SF6 gas enters the movable cavity 12 and flows through the gas guiding channel 51 to the connection between the conducting rod 14 and the conducting sleeve 21 together with the original gas. With its excellent arc extinguishing performance, such as high electrical insulation strength, good heat conductivity, and strong electro-negativity (able to adsorb electrons to form negative ions and accelerate the deionization of the arc), the SF6 gas quickly suppresses the development of the arc. Through effects such as cooling and deionization, the arc is quickly extinguished, thereby protecting the conducting components and ensuring the normal operation of the circuit breaker. During and after the arc extinguishing process, the SF6 gas can form a good insulating medium between the conducting components to maintain the electrical insulation performance. Even after the arc is extinguished, the SF6 gas can still continue to isolate the conducting components to prevent re-discharge caused by residual charges or other factors, ensuring the electrical safety after the opening and closing operations of the circuit breaker.

[0041] The arc extinguishing function of the SF6 gas is closely combined with the opening and closing actions of the circuit breaker to form an efficient arc extinguishing system. It can automatically sense the temperature change generated by the arc and respond quickly. By using the movable cavity 12 and the gas guiding channel 51 to guide the gas flow direction, the SF6 gas with good arc extinguishing performance can be transported to the designated position at the moment the arc is generated, achieving fast and effective arc extinguishing, protecting the conducting components from arc ablation, improving the opening and closing performance and reliability of the circuit breaker, ensuring the normal operation of the circuit breaker, and guaranteeing the safety and stability of the power system; the SF6 gas itself has excellent arc extinguishing characteristics. Combined with the design of this component, the gas can be accurately transported to the position where the arc is generated, enhancing the arc extinguishing effect and improving the reliability and service life of the circuit breaker.

[0042] It should be noted that the specific model and specification of the electric cylinder need to be selected and determined according to the actual specifications of the device, etc. The specific selection calculation method adopts the existing technology in this field, so it will not be elaborated in detail.

[0043] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pluggable circuit breaker switch, comprising a switch module (10) and a mounting bracket (3), wherein the switch module (10) includes a circuit breaker body (1) and a base (2), a conductive sleeve (21) and a power output board (22) are mounted on the base (2), a protective cover (4) is snap-fitted and mounted on the circuit breaker body (1), a circuit breaker operating handle (11) is provided on the front side of the circuit breaker body (1), a conductive rod (14) matching the conductive sleeve (21) is mounted on the circuit breaker body (1), the base (2) is mounted on the mounting bracket (3) through a mounting bolt (31), and a breaking and closing mechanism is provided on the rear side of the base (2), characterized in that, The make-and-break mechanism includes a micro electric cylinder (8) fixed to the rear side of the base (2). A piston rod (81) is provided inside the micro electric cylinder (8). An accommodation cavity (811) is formed at the end of the piston rod (81). A fixed magnetic plate (812) is fixedly provided in the middle of the accommodation cavity (811). An active magnetic plate (813) is provided in each of the accommodation cavities (811) above and below the fixed magnetic plate (812). It further includes: A sealing and gas guiding assembly: The sealing and gas guiding assembly is arranged on the circuit breaker body (1) and surrounds the conducting rod (14). The sealing and gas guiding assembly includes an arc extinguishing cover (5), a moving cavity (12) arranged inside the circuit breaker body (1), and an inner support sleeve (13) fixedly arranged in the moving cavity (12). A plurality of gas guiding channels (51) are annularly formed on the inner wall of the arc extinguishing cover (5). An induction arc extinguishing assembly: The induction arc extinguishing assembly is arranged inside the sealing and gas guiding assembly.

2. The pluggable circuit breaker switch according to claim 1, wherein, A through hole matching the piston rod (81) is provided on the base (2). A positioning hole (82) matching the end of the piston rod (81) and the active magnetic plate (813) is provided on the rear side of the circuit breaker body (1).

3. The pluggable circuit breaker switch according to claim 2, characterized in that, The two active magnetic plates (813) are symmetrically distributed. The magnetic properties of the opposite surfaces of the active magnetic plates (813) and the fixed magnetic plate (812) are the same. The cross section of the active magnetic plate (813) is arranged in a U-like shape.

4. A pluggable circuit breaker switch according to claim 1, characterized in that, One end of the arc extinguishing cover (5) is located inside the moving cavity (12), and the other end is located outside the circuit breaker body (1). A limiting plate (53) is fixedly connected to the end of the arc extinguishing cover (5) located inside the moving cavity (12). The limiting plate (53) matches the cross section of the inner cavity of the moving cavity (12). A positioning ring (54) is fixedly connected to the outside of the end of the arc extinguishing cover (5) located outside the circuit breaker body (1). An annular airbag (9) is fixedly installed inside the positioning ring (54). A first spring (52) is fixedly connected to the inner wall of the moving cavity (12). The end of the first spring (52) is fixedly connected to the limiting plate (53). The cross section of the gas guiding channel (51) is a trapezoidal structure without a bottom. The outer end of the gas guiding channel (51) faces the side wall of the conducting rod (14).

5. The plug-in circuit breaker switch according to claim 4, characterized in that The outer end of the inner support sleeve (13) is flush with the rear side of the circuit breaker body (1). The conducting rod (14) passes through the inside of the inner support sleeve (13). The arc extinguishing cover (5) is arranged in a cylindrical shape. A notch matching the arc extinguishing cover (5) is provided on the rear side of the circuit breaker body (1). The inner support sleeve (13) is at the center of the notch. The arc extinguishing cover (5) passes through the gap between the inner support sleeve (13) and the notch. The arc extinguishing cover (5) is slidably and sealingly connected with the inner support sleeve (13) and the notch. When the first spring (52) is in the initial state, the arc extinguishing cover (5) can completely block the outer end of the conducting rod (14), and the limiting plate (53) abuts against the inner wall of the moving cavity (12).

6. The pluggable circuit breaker switch according to claim 4, characterized in that, A plurality of jacks (541) are provided at the rear side of the positioning ring (54) corresponding to the annular airbag (9). The plurality of jacks (541) are evenly distributed in a ring shape at equal intervals. A convex column (15) matching the jack (541) is fixedly provided on the rear side wall of the circuit breaker body (1). The length of the convex column (15) is greater than the length of the jack (541).

7. A plug-in circuit breaker switch according to claim 6, characterized in that, When the circuit breaker body (1) is connected to the base (2), one side of the positioning ring (54) abuts against the side wall of the base (2), and the other side abuts against the side wall of the circuit breaker body (1), and the annular airbag (9) is in a saturated state. When the circuit breaker body (1) is connected to the base (2), the inner end of the air guide channel (51) is inside the moving cavity (12). When the circuit breaker body (1) is disconnected from the base (2), the inner end of the air guide channel (51) is blocked by the inner support sleeve (13).

8. A pluggable circuit breaker switch according to claim 4, characterized in that, The sealed air guide assembly further includes an installation cavity (121) provided inside the side wall of the moving cavity (12) close to the convex column (15). A trip switch (1211) and a second spring (1212) are fixedly installed inside the installation cavity (121). The trip switch (1211) is electrically connected to the operating mechanism of the circuit breaker operating handle (11). The end of the second spring (1212) is fixedly connected to a pressure rod (1213). When the first spring (52) is in an initial state, the pressure rod (1213) contacts the trip switch (1211) under the push of the limit plate (53).

9. The plug-in circuit breaker switch according to claim 4, characterized in that, The induction arc extinguishing assembly includes a gas storage box (6) fixedly installed inside the moving cavity (12). A temperature sensor (7) is installed inside the gas storage box (6). The limit plate (53) is provided with a through port (531) matching the contour of the gas storage box (6). An electromagnetic valve (61) is installed on the side wall of the gas storage box (6). A gas filling port (62) is provided on the side wall of the gas storage box (6) facing the base (2). A plug (621) is inserted and installed inside the gas filling port (62). The inside of the gas storage box (6) is pre-filled with high-pressure SF6 gas.

10. A pluggable circuit breaker switch according to claim 9, characterized in that, The electromagnetic valve (61) is electrically connected to the temperature sensor (7). The housing of the gas storage box (6) and the inner support sleeve (13) are both made of high thermal conductivity alloy material.

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