A full ground full shield isolation circuit breaker

Abstract

The application discloses a full-ground full-shield isolated circuit breaker, which comprises a box body and an isolating device; the isolating device comprises a mounting seat, a transmission mechanism, an operating mechanism and a station switching mechanism; the mounting seat is fixed in the box body; the transmission mechanism is arranged in the mounting seat; the operating mechanism comprises a stop sleeve and an operating shaft; the stop sleeve is rotatably arranged in the mounting seat; the operating shaft is sleeved in the stop sleeve; the station switching mechanism comprises a position indicator and a limiting piece; the position indicator moves linearly along the length direction of the mounting seat with the transmission mechanism; the front end of the limiting piece is detachably fixed to the top of the box body; and the rear end extends above the transmission mechanism. The application improves the assembly efficiency, the consistency and accuracy of the mechanism indicating position on the panel, makes the use of the handle more convenient, reduces the use cost of the handle, and realizes the switching between the two stations and the three stations without greatly disassembling the isolating device, so that the isolating device is low in dismounting difficulty and high in efficiency.

Description

Technical Field

[0001] This invention relates to the field of switchgear technology, specifically to a fully grounded and fully shielded isolation circuit breaker. Background Technology

[0002] The primary components of a solid-insulated ring main unit mainly include disconnect switches, busbar systems, circuit breaker modules, etc. Among them, the disconnect switch is the most widely used device in medium and high voltage switchgear. It controls the opening and closing of the circuit under no-load current. Traditional disconnect switches are mostly two-position, while three-position disconnect switches integrate a grounding position on the basis of traditional two-position disconnect switches, so that it has three working positions: closed position, grounding position, and intermediate isolation position. The connection, isolation, and grounding states of electrical equipment are switched by operating the three-position disconnect switch.

[0003] Three-position disconnect switches can generally be classified into knife-switch type and direct-acting type according to their contact movement method. Existing direct-acting three-position disconnect switches are generally available with both manual and electric operation modes. For the manual operation mode, [the switch is] equipped with... Figure 1 and Figure 2 As shown, the disconnect switch includes a mounting base 1, a drive rod 2, a crank handle, a lead screw slider 4, a connecting plate 5, and a sector indicator 6. The drive rod 2 is disposed in the mounting base 1. The crank handle includes a handle 31, a shaft 32, a spring 33, and a sleeve 34 arranged in sequence. When the shaft 32 is inserted into the opening of the drive rod 2, the sleeve 34 moves forward under the pushing force of the shaft 32 and compresses the spring 33. Then, cranking the handle 31 drives the lead screw slider 4 to move. When the lead screw slider 4 moves left and right, the sector indicator 6 is connected to the lead screw slider 4 through the connecting plate 5 and moves together. One end of the sector indicator 6 is hinged to the connecting plate 5. The sector indicator 6 swings and switches the indicating position under the drive of the connecting plate 5, changing the linear motion of the lead screw slider 4 into the rotational motion of the sector indicator 6 to indicate the working status of the disconnect switch.

[0004] It is evident that the operating components of the manual operation mode of the disconnect switch are mainly integrated into the crank handle, making the crank handle complex in structure and inconvenient to use. Furthermore, the crank handle cannot be shared with the energy storage handle of the circuit breaker mechanism, resulting in high operating costs. Additionally, the position indication structure of the disconnect switch is relatively complex, leading to a long debugging and assembly time for the sector indicator 6 on the cabinet or circuit breaker panel. Moreover, the indicated position of the sector indicator 6 must be highly consistent with the operating position of the disconnect mechanism to ensure the consistency and accuracy of the mechanism's indicated position on the panel, resulting in low assembly efficiency and an inability to guarantee the consistency and accuracy of the indicated position.

[0005] Meanwhile, to meet the different needs of customers, the design of disconnect switches usually considers interchangeable three-position / two-position structures. Currently commonly used interchangeable structures include... Figure 1As shown, when the disconnecting switch is working, the lead screw slider 4 moves left and right between the two connecting blocks 7. The movement of the lead screw slider 4 can switch the disconnecting switch between three positions: closing, grounding, and isolation. To switch the disconnecting switch from the third position to the second position, the common practice is to put an upper limit tube 8 on the lead screw between the connecting block 7 and the lead screw slider 4. The limit tube 8 limits the slider, preventing it from moving to the grounding position, thus completing the switch from the third position to the second position. Although this structure can achieve the switch from the third position to the second position, it has the problem of difficult installation and removal. That is, after installing the upper limit tube, if it is necessary to switch from the second position to the third position, the isolation mechanism needs to be disassembled extensively to remove the upper limit tube, which is difficult and inefficient.

[0006] In addition, existing circuit breaker modules have problems such as large product size, inconvenient installation and use, poor scalability, and inability to effectively control the electric field to reduce partial discharge. Summary of the Invention

[0007] The purpose of this invention is to provide a fully grounded and fully shielded isolation circuit breaker, which not only makes the use of the handle more convenient and reduces the cost of using the handle, but also improves assembly efficiency and the consistency and accuracy of the position indication.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A fully grounded and fully shielded isolating circuit breaker includes a housing and an isolating device. The isolating device includes a mounting base, a transmission mechanism, an operating mechanism, and a station switching mechanism. The mounting base is fixed in the housing, and the transmission mechanism is disposed in the mounting base. The operating mechanism includes a stop sleeve and an operating shaft. The stop sleeve is rotatably disposed in the mounting base, and the operating shaft is sleeved in the stop sleeve. Driving the operating shaft can drive the transmission mechanism to move. The station switching mechanism includes a position indicator and a limiting member. The position indicator moves linearly along the length of the mounting base with the transmission mechanism. The front end of the limiting member is detachably fixed to the top of the housing, and the rear end extends above the transmission mechanism to prevent the transmission mechanism from switching to the grounding position.

[0010] Furthermore, the transmission mechanism includes a motor, a screw, a slider, and a chain drive assembly. The motor and screw are disposed in the mounting base. The motor drives the screw. The slider slides with the screw. Driving the operating shaft can drive the screw to move. The position indicator is fixed together with the slider. The isolation device also includes a limiting mechanism disposed in the mounting base to limit the rotation angle of the operating shaft. The chain drive assembly is connected to the operating shaft.

[0011] Furthermore, the operating mechanism also includes a return spring. The operating shaft includes a plug-in section, a connecting section, and a driving section arranged sequentially. The plug-in section has a square cross-sectional shape. The plug-in section and the connecting section are fitted into the stop sleeve. A positioning pin is inserted into the connecting section. The stop sleeve is provided with a guide opening. The positioning pin is located in the guide opening. The stop sleeve is provided with a mounting part on its circumferential surface near the guide opening. A bearing is connected to the mounting part by a pin. The return spring is fitted into the connecting section, and its two ends abut against the driving section and the stop sleeve, respectively.

[0012] Furthermore, the mounting base includes a front fixing plate, a middle fixing plate, a connecting block, and a rear fixing plate arranged side by side. The stop sleeve passes through the front fixing plate and the middle fixing plate. A set of the connecting blocks is fixed between the middle fixing plate and the rear fixing plate. The limiting mechanism is disposed between the middle fixing plate and the rear fixing plate. The screw is disposed on the connecting block. The top of the housing is provided with an opening for the limiting member to pass through. The rear fixing plate is provided with a plug-in interface. The plug-in interface is located below the screw. The front end of the limiting member is detachably fixed by a lock. The rear end of the limiting member is inserted into the plug-in interface.

[0013] Furthermore, a connecting plate is fixed on the slider, the position indicator is fixed to the end of the connecting plate, a guide plate is provided at the bottom of the connecting plate, a front guide opening is provided on the front fixed plate along its length direction, the guide plate can move along the front guide opening, a rear guide opening is provided on the rear fixed plate along its length direction, the connecting plate is inserted into the rear guide opening and can move along the rear guide opening, a guide protrusion is provided on the side of the slider, and a middle guide opening is provided on the middle fixed plate along its length direction, the guide protrusion can move along the middle guide opening.

[0014] Furthermore, the limiting mechanism includes a stop pin, an actuator, and a drive plate. The stop pin passes through the middle fixed plate, and the operating shaft drives the stop pin to move up and down to block or allow the bearing to pass. The actuator includes a first swing plate and a second swing plate. The middle part of the first swing plate is hinged to the rear fixed plate through a first column. A first drive rod, a second drive rod, and a third drive rod are respectively provided on the first swing plate. The first drive rod and the second drive rod are located on both sides of the first column, and the third drive rod is located below the first drive rod. The sides of the first drive rod and the second drive rod are... The first and third pillars are respectively provided on the sides. A first spring and a second spring are respectively connected between the first and second pillars and between the second and third pillars. One end of the second swing plate is hinged to the rear fixed plate through the fourth pillar and connected to its side through the fifth pillar and the third spring. The stop pin is provided at the other end of the second swing plate. The second driving rod abuts against the bottom of the second swing plate. The driving plate is movably provided in the rear fixed plate and is driven by the slider. The first pillar and the first driving rod are respectively inserted in the driving plate.

[0015] Furthermore, the limiting component includes a mounting plate and a plug-in plate. The plug-in plate includes a plug-in body and a plug-in portion. The front end of the plug-in body connects to the mounting plate, and the rear end extends to form the plug-in portion. The access lock includes a lock seat and a locking member. The lock seat is disposed on the top of the mounting plate, and the locking member locks the lock seat and the mounting plate to the top of the housing. The locking member includes a locking rod and a nut. The lock seat is provided with a lock hole, and the mounting plate is provided with a connecting hole. The locking rod passes through the lock hole and the connecting hole, and the mounting plate is locked to the top of the housing by the nut that cooperates with it.

[0016] Furthermore, it also includes a circuit breaker module, which comprises an insulating housing, a disconnecting switch mechanism, a vacuum switch mechanism, and connecting conductors. The insulating housing is made of epoxy resin material and coated with a semiconductor coating. The insulating housing has an upper chamber and a lower chamber. The disconnecting switch mechanism is located on the left side of the upper chamber, and an upper outlet is located on the right side of the upper chamber. The vacuum switch mechanism is located on the left side of the lower chamber, and a lower outlet is located on the right side of the lower chamber. A main circuit interface is located on the side of the lower outlet in the lower chamber. The connecting conductors include an upper conductor and a lower conductor that are electrically connected to each other. The upper conductor is located in the upper chamber, and the lower conductor is located in the lower chamber.

[0017] Furthermore, the disconnecting switch mechanism includes a lead screw mechanism, an isolation cylinder, an upper lead conductor, and an isolation contact disposed in the upper chamber. The lead screw mechanism is connected to a transmission mechanism. The upper and lower conductors are a T-shaped integrated structure. The upper conductor is a hollow cylindrical structure. The isolation cylinder is disposed on the side of the upper conductor. The upper lead conductor is installed in the upper lead outlet. The isolation contact is disposed in the upper conductor and the isolation cylinder, and is driven by the lead screw mechanism to connect or disconnect with the upper lead conductor. The vacuum switch... The mechanism includes a pull rod mechanism, a vacuum interrupter, a moving contact, a stationary contact, a lower lead conductor, and a main circuit conductor, all disposed in the lower chamber. The moving contact and the stationary contact are disposed in the vacuum interrupter. The moving contact is connected to or disconnected from the stationary contact by the pull rod mechanism. The lower lead conductor is installed in the lower lead outlet and is connected to the stationary contact. The main circuit conductor is installed in the main circuit interface and is connected to the lower lead conductor. A flexible connection is provided on the lower conductor, and the pull rod mechanism is connected to the flexible connection.

[0018] Furthermore, a first shielding cover is provided on the side of the upper conductor, a second shielding cover is provided at both ends of the isolation cylinder, a third shielding cover is provided on the side of the upper outgoing conductor, a fourth shielding cover is provided on the side of the lower outgoing conductor, and a fifth shielding cover is provided outside the main circuit conductor. All the first to fifth shielding covers are cylindrical structures. A sixth shielding cover is provided outside the lower conductor and the vacuum interrupter. The sixth shielding cover includes a first cover and a second cover with an integral structure. The first cover covers the lower conductor and the flexible connection, and the second cover covers the side of the vacuum interrupter.

[0019] By adopting the above technical solution, the present invention has the following advantages compared with the prior art:

[0020] 1. This invention changes the position indication of the isolation device from rotational swing to left and right linear movement. That is, the transmission mechanism drives the position indicator to move left and right, and the position indicator moves together with the transmission mechanism, thereby realizing the left and right linear movement of the position indication. This not only greatly reduces the debugging and assembly time of the isolation device position indication on the cabinet or circuit breaker panel and improves the assembly efficiency, but also ensures that the position indicator and the transmission mechanism move in a high degree of consistency, improving the consistency and accuracy of the mechanism indication position on the panel.

[0021] 2. This invention optimizes the manual operation of the isolation device by integrating the components on the original isolation mechanism handle into the isolation device, simplifying the handle structure, making the handle more convenient to use, and allowing it to be shared with the energy storage handle of the circuit breaker mechanism, thus reducing the cost of using the handle.

[0022] 3. The present invention has a limiting component detachably fixed on the top of the housing. The limiting component limits the transmission mechanism, preventing the blocked transmission mechanism from moving to the contact position. At this time, the disconnect switch is in the second position. After the limiting component is removed, the transmission mechanism is no longer limited and can move to the contact position, which is the third position. The switching between the second and third positions can be achieved without extensive disassembly of the isolation device. The isolation device is easy to install and remove and has high efficiency.

[0023] 4. In this invention, the isolating switch mechanism, vacuum switch mechanism and connecting conductor are integrated into an insulating housing to form a single product. The overall structure of the product is more compact, making the product smaller and easier to install and use. The insulating housing is made of epoxy resin material and coated with a semiconductor coating, which makes the product have good insulation and thermal conductivity, a touchable surface, and is safer and maintenance-free to use.

[0024] 5. The present invention has an additional main circuit interface on the side of the lower chamber. The main circuit interface can be used as the power supply port for front-mounted surge arresters, fully enclosed shielded PTs, and for other expansion purposes, so as to realize the diversified application of the switching module function.

[0025] 6. The present invention has a first shielding cover on the side of the upper conductor, a second shielding cover on both ends of the isolation cylinder, a third shielding cover on the side of the upper outgoing conductor, a fourth shielding cover on the side of the lower outgoing conductor, a fifth shielding cover outside the main circuit conductor, and a sixth shielding cover outside the lower conductor and the vacuum arc extinguisher. The installation of shielding covers at various locations makes the electric field in the upper and lower chambers more uniform, and no partial discharge is generated during the use and operation of the product, making the product safer, more reliable, and with a longer service life. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of an existing disconnect switch;

[0027] Figure 2 The operating handle structure is based on the existing disconnect switch;

[0028] Figure 3 This is one of the three-dimensional schematic diagrams of the present invention;

[0029] Figure 4 This is an exploded view of the present invention;

[0030] Figure 5 This is a second three-dimensional schematic diagram of the present invention (partial structure omitted);

[0031] Figure 6 This is the third perspective view of the present invention (partial structure omitted);

[0032] Figure 7This is the fourth three-dimensional schematic diagram of the present invention (partial structure omitted);

[0033] Figure 8 This is the fifth three-dimensional schematic diagram of the present invention (partial structure omitted);

[0034] Figure 9 This is a three-dimensional schematic diagram of the present invention (partial structure omitted);

[0035] Figure 10 This is a schematic diagram of the installation of the location indicator in this invention;

[0036] Figure 11 This is a schematic diagram of the slider and connecting plate in this invention;

[0037] Figure 12 This is a schematic diagram of the operating mechanism in this invention;

[0038] Figure 13 This is an exploded view of the operating mechanism in this invention;

[0039] Figure 14 This is a schematic diagram of the handle structure in this invention;

[0040] Figure 15 This is a schematic diagram of the workstation switching mechanism in this invention;

[0041] Figure 16 In this invention Figure 15 A schematic diagram of the decomposition process;

[0042] Figure 17 This is a schematic diagram showing the installation of the operating mechanism and the limiting mechanism in this invention;

[0043] Figure 18 In this invention Figure 17 A schematic diagram of the decomposition process;

[0044] Figure 19 This is one of the structural schematic diagrams of the limiting mechanism in this invention;

[0045] Figure 20 This is the second schematic diagram of the limiting mechanism in this invention;

[0046] Figure 21 This is one of the structural schematic diagrams of the circuit breaker module of the present invention;

[0047] Figure 22 This is the second schematic diagram of the circuit breaker module of the present invention;

[0048] Figure 23 This is a cross-sectional view of the insulating shell in this invention;

[0049] Figure 24 This is an exploded view of the circuit breaker module of the present invention;

[0050] Figure 25 This is the third schematic diagram of the circuit breaker module of the present invention (insulating housing omitted);

[0051] Figure 26 In this invention Figure 25 A sectional view;

[0052] Figure 27 This is one of the usage state diagrams of the present invention;

[0053] Figure 28 This is the second usage state diagram of the present invention;

[0054] Figure 29 This is the third diagram showing the usage state of the present invention.

[0055] Explanation of reference numerals in the attached figures:

[0056] Mounting base 1, drive rod 2, handle 31, handle shaft 32, spring 33, sleeve 34, lead screw slider 4, connecting plate 5, sector indicator 6, connecting block 7, limit tube 8;

[0057] Box body 10, opening 101, partition 102, bracket 103;

[0058] Isolation device 20;

[0059] Mounting base 100, front fixing plate 110, front guide port 111, middle fixing plate 120, middle guide port 121, limiting port 122, guide groove 123, connecting block 130, rear fixing plate 140, plug interface 141, rear guide port 142;

[0060] Transmission mechanism 200, motor 210, screw 220, slider 230, guide protrusion 231, connecting plate 240, connecting body 241, rear connecting part 242, front connecting part 243, guide plate 244, chain drive assembly 250;

[0061] Operating mechanism 300, stop sleeve 310, guide port 311, mounting part 312, bayonet 313, operating shaft 320, plug section 321, connecting section 322, drive section 323, positioning pin 324, return spring 330, bearing 340;

[0062] Workstation switching mechanism 400, position indicator 410, limit component 420, mounting plate 421, connecting hole 4211, plug-in plate 422, plug-in body 4221, plug-in part 4222, access lock 430, lock seat 431, lock hole 4311, lock rod 432, nut 433, interlocking plate 440, operating hole 441, toggle rod 442;

[0063] Limiting mechanism 500, stop pin 510, first swing plate 520, first column 521, first drive rod 522, second drive rod 523, third drive rod 524, second column 525, third column 526, first spring 527, second spring 528, second swing plate 530, fourth column 531, fifth column 532, third spring 533, drive plate 540, drive part 541, first elongated opening 542, second elongated opening 543, U-shaped opening 544, guide screw 545;

[0064] Circuit breaker module 30;

[0065] Insulating housing 600, upper chamber 610, upper outlet 611, lower chamber 620, lower outlet 621, main circuit interface 622, first observation window 630, second observation window 640, cover plate 650;

[0066] Disconnecting switch mechanism 700, lead screw mechanism 710, lead screw 711, lead screw pair 712, isolation cylinder 720, second shielding cover 721, upper outgoing conductor 730, third shielding cover 731, isolation contact 740;

[0067] Vacuum switch mechanism 800, lever mechanism 810, vacuum interrupter 820, moving contact 830, stationary contact 840, lower lead conductor 850, fourth shielding cover 851, main circuit conductor 860, fifth shielding cover 861;

[0068] Connecting conductor 900, upper conductor 910, first shield 911, lower conductor 920, flexible connection 930, sixth shield 940, first cover 941, and second cover 942. Detailed Implementation

[0069] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, it should be noted that:

[0070] The terms “upper,” “lower,” “left,” “right,” “vertical,” “horizontal,” “inner,” and “outer” are based on the orientation or positional relationship shown in the accompanying drawings and are used merely for the convenience of describing the present invention and simplifying the description. They are not intended to indicate or imply that the device or element of the present invention must have a specific orientation and therefore should not be construed as a limitation of the present invention.

[0071] When an element is referred to as being "fixed to," "set on," or "contained on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to," it can be directly connected to or indirectly connected to that other element.

[0072] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0073] Example

[0074] Cooperate Figures 3 to 5 As shown, the present invention discloses a fully grounded and fully shielded isolation circuit breaker, including a housing 10, an isolation device 20 and a circuit breaker module 30. The isolation device 3 includes a mounting base 100, a transmission mechanism 200, an operating mechanism 300 and a workstation switching mechanism 400.

[0075] Cooperate Figure 7 , Figures 8 to 10 As shown, the mounting base 100 is fixed in the housing 10, and the transmission mechanism 200 is disposed in the mounting base 100. The transmission mechanism 200 includes a motor 210, a screw 220, a slider 230, a connecting plate 240, and a chain drive assembly 250. The motor 210 and the screw 220 are disposed in the mounting base 100. The motor 210 drives the screw 220, and the slider 230 slides with the screw 220. In this embodiment, the connecting plate 240 includes a connecting body 241, a rear connecting portion 242, and a front connecting portion 243. The connecting body 241 extends to the rear end to form the rear connecting portion 242, which is connected to the slider 230. The connecting body 241 bends to the front end to form the front connecting portion 243, which is connected to the position indicator 410.

[0076] Cooperate Figure 7 , Figures 12 to 14As shown, the operating mechanism 300 includes a stop sleeve 310, an operating shaft 320, and a return spring 330. The stop sleeve 310 is rotatably mounted in the mounting base 100. The operating shaft 320 is sleeved in the stop sleeve 310. Driving the operating shaft 320 can drive the screw 220 to move. The operating shaft 320 includes a plug-in section 321, a connecting section 322, and a driving section 323 arranged sequentially. The plug-in section 321 has a square cross-sectional shape. The plug-in section 321 and the connecting section 322 are sleeved in the stop sleeve 310. A positioning pin 324 is inserted in the connecting section 322. The stop sleeve 310 is provided with a guide opening 311. The positioning pin 324 is located in the guide opening 311. In this embodiment, the guide opening 311 is triangular. The stop sleeve 310 has a mounting part 312 on its circumferential surface near the guide port 311. A bearing 340 is connected to the mounting part 312 by a pin. The return spring 330 is sleeved in the connecting section 322, and its two ends abut against the driving section 323 and the stop sleeve 310, respectively. By integrating the components on the original isolation mechanism handle into the operating mechanism 300, the manual operation method of the operating mechanism 300 is optimized, making the handle structure simpler and more convenient to use. Furthermore, the manual operating handle of the operating mechanism 300 can be shared with the energy storage handle of the circuit breaker mechanism, reducing the operating cost of the handle.

[0077] Cooperate Figures 5 to 9 , Figure 15 , Figure 16 As shown, the workstation switching mechanism 400 includes a position indicator 410 and a limiting member 420. The position indicator 410 is fixed together with the slider 230. The position indicator 410 moves linearly along the length of the mounting base 100 with the transmission mechanism 200. The front end of the limiting member 420 is detachably fixed to the top of the housing, and the rear end extends above the transmission mechanism 200. It is used to block the transmission mechanism 200 from switching to the contact position, so that the blocked slider 230 cannot move to the contact position. At this time, the disconnecting switch is in the two-position state. After the limiting member 420 is removed, the slider 230 is not restricted and can move to the contact position. At this time, it is in the three-position state. The switching between the two-position and the three-position can be realized without extensive disassembly of the isolation device.

[0078] By changing the position indicator of the isolating device from a rotary swing to a linear left-right movement, that is, the motor 210 drives the screw 220 to move the position indicator plate 410 left and right, and the position indicator plate 410 moves together with the screw 220, thus realizing the linear left-right movement of the position indicator. This not only significantly reduces the debugging and assembly time of the isolating device position indicator on the circuit breaker panel and improves the assembly efficiency, but also ensures that the position indicator plate 410 and the screw 220 move in a highly consistent manner, improving the consistency and accuracy of the mechanism position indication on the panel.

[0079] The mounting base 100 includes a front fixing plate 110, a middle fixing plate 120, a connecting block 130, and a rear fixing plate 140 arranged side by side. A stop sleeve 310 passes through the front fixing plate 110 and the middle fixing plate 120. A set of connecting blocks 130 is fixed between the middle fixing plate 120 and the rear fixing plate 140. A screw 220 is set on the connecting block 130. The top of the housing 10 is provided with an opening 101 for the insertion of a limiting member 420. The rear fixing plate 140 is provided with a plug-in interface 141, which is located below the screw 220. The front end of the limiting member 420 is detachably fixed by an access lock 430. The rear end of the limiting member 420 is inserted into the plug-in interface 141. The limiting member 420 can only be removed after the access lock 430 is unlocked. That is, only operators with specific permissions can perform the two-station / three-station switching operation, which improves the safety of the isolation device.

[0080] The limiting member 420 includes a mounting plate 421 and a plug-in plate 422. The plug-in plate 422 includes a plug-in body 4221 and a plug-in portion 4222. The front end of the plug-in body 4221 is connected to the mounting plate 421, and the rear end extends to form the plug-in portion 4222. In this embodiment, the width of the plug-in body 4221 is greater than the width of the plug-in interface 141, and the width of the plug-in portion 4222 is less than the width of the plug-in interface 141, so that the plug-in portion 4222 can abut against the plug-in interface 141, ensuring that the plug-in body 4221 stably limits the slider 230.

[0081] The access lock 430 includes a lock base 431 and a locking member. The lock base 431 is located on top of the mounting plate 421. The locking member locks the lock base 431 and the mounting plate 421 to the top of the housing 10. The locking member includes a locking rod 432 and a nut 433. The lock base 431 has a lock hole 4311, and the mounting plate 421 has a connecting hole 4211. The locking rod 432 passes through the lock hole 4311 and the connecting hole 4211, and the mounting plate 421 is locked to the top of the housing 10 by the nut 433 (the nut 433 is welded to the bottom surface of the top of the housing 10). In this embodiment, the locking rod 432 includes a lock head and a threaded rod. The lock head is housed in the lock base 431 and is compatible with an unlocking key. Only authorized personnel with the unlocking key can rotate the lock head to tighten or loosen the locking rod 432. The bottom of the lock head extends to form a threaded rod, which cooperates with the nut 433.

[0082] Cooperate Figures 7 to 11 , Figure 13As shown, the workstation switching mechanism 400 also includes an interlocking plate 440. The front end of the stop sleeve 310 is provided with a bayonet 313. The interlocking plate 440 is movably disposed in the front fixed plate 110. The interlocking plate 440 is provided with an operating hole 441, which is shaped like a gourd with one large and one small hole. By moving the interlocking plate 440, the smaller hole of the operating hole 441 is engaged with the bayonet 313 to lock the stop sleeve 310. The interlocking plate 440 is provided with a toggle rod 442 to facilitate the movement of the interlocking plate 440.

[0083] The position indicator 410 is fixed to the end of the connecting plate 240. A guide plate 244 is provided at the bottom of the connecting plate 240. A front guide opening 111 along its length is provided on the front fixed plate 110, allowing the guide plate 244 to move along the front guide opening 111. A rear guide opening 142 along its length is provided on the rear fixed plate 140, into which the connecting plate 240 is inserted and can move. A guide protrusion 231 is provided on the side of the slider 230, and a middle guide opening 121 along its length is provided on the middle fixed plate 120, allowing the guide protrusion 231 to move along the middle guide opening 121. By providing guide structures on the front fixed plate 110, middle fixed plate 120, rear fixed plate 140, and slider 230, the stability and accuracy of the position indicator 410 as it moves with the screw 220 and slider 230 are improved.

[0084] Cooperate Figure 7 , Figures 17 to 20 As shown, the isolation device also includes a limiting mechanism 500, which is disposed in the mounting base 100 and is used to limit the rotation angle of the operating shaft 320. The chain drive assembly 250 is connected to the operating shaft 320. The limiting mechanism 500 includes a stop pin 510, an actuator, and a drive plate 540. The middle fixed plate 120 is provided with a limiting port 122 above the stop sleeve 310. The stop pin 510 passes through the limiting port 122. The rotation of the operating shaft 320 drives the actuator to move the stop pin 510 up and down in the limiting port 122, so that the stop pin 510 blocks or allows the bearing 340 to move.

[0085] The actuator includes a first swing plate 520 and a second swing plate 530. The middle part of the first swing plate 520 is hinged to the rear fixed plate 140 through a first column 521. A first drive rod 522, a second drive rod 523 and a third drive rod 524 are respectively provided on the first swing plate 520. The first drive rod 522 and the second drive rod 523 are located on both sides of the first column 521. The middle fixed plate 120 is provided with guide grooves 123 on both sides of the limiting port 122. The guide grooves 123 guide the movement of the first drive rod 522 and the second drive rod 523. The third drive rod 524 is located below the first drive rod 522. A second column 525 and a third column 526 are respectively provided on the sides of the first drive rod 522 and the second drive rod 523. A first spring 527 and a second spring 528 are respectively connected between the first drive rod 522 and the second column 525, and between the second drive rod 523 and the third column 526. One end of the second swing plate 530 is hinged to the rear fixed plate 140 via the fourth column 531, and is connected to the side via the fifth column 532 and the third spring 533. The stop pin 510 is provided at the other end of the second swing plate 530. The second drive rod 523 abuts against the bottom of the second swing plate 530. Under the tension of the first spring 527 and the second spring 528, the second drive rod 523 causes the second swing plate 530 to swing upward and compresses the third spring 533.

[0086] The drive plate 540 is movably disposed in the rear fixed plate 140 and is driven by the slider 230. The first column 521 and the first drive rod 522 are respectively inserted into the drive plate 540. The two ends of the drive plate 540 are bent to form drive parts 541. The slider 230 drives the drive parts 541 to move. In this embodiment, the drive plate 540 is provided with a first elongated opening 542, a second elongated opening 543 and a U-shaped opening 544. The first elongated opening 542 and the second elongated opening 543 are respectively arranged along the length direction of the drive plate 540. The first column 521 is inserted into the first elongated opening 542. A guide screw 545 is provided in the second elongated opening 543. The U-shaped opening 544 is located below the first elongated opening 542. The first drive rod 522 is inserted into the U-shaped opening 544.

[0087] Cooperate Figure 3 , Figures 21 to 26As shown, the circuit breaker module 30 includes an insulating housing 600, a disconnecting switch mechanism 700, a vacuum switch mechanism 800, and a connecting conductor 900. The insulating housing 600 is made of epoxy resin material and coated with a semiconductor coating. The insulating housing 600 has an upper chamber 610 and a lower chamber 620. The disconnecting switch mechanism 700 is located on the left side of the upper chamber 610, and an upper outlet 611 is located on the right side of the upper chamber 610. The vacuum switch mechanism 800 is located on the left side of the lower chamber 620, and a lower outlet 621 is located on the right side of the lower outlet 621. A main circuit interface 622 is located on the side of the lower outlet 621 in the lower chamber 620. The connecting conductor 900 includes an upper conductor 910 and a lower conductor 920 that are electrically connected to each other. The upper conductor 910 is located in the upper chamber 610, and the lower conductor 920 is located in the lower chamber 620.

[0088] The disconnecting switch mechanism 700 includes a screw mechanism 710, an isolation cylinder 720, an upper lead conductor 730, and an isolation contact 740 disposed in the upper chamber 610. The screw mechanism 710 is connected to the transmission mechanism 200. The upper conductor 910 and the lower conductor 920 are a T-shaped integrated structure. The upper conductor 910 is a hollow cylindrical structure. The isolation cylinder 720 is disposed on the side of the upper conductor 910. The upper lead conductor 730 is installed in the upper lead outlet 611. The isolation contact 740 is disposed in the upper conductor 910 and the isolation cylinder 720, and is driven by the screw mechanism 710 to connect or disconnect with the upper lead conductor 730.

[0089] In this embodiment, the lead screw mechanism 710 includes a lead screw 711 and a lead screw pair 712. The lead screw 711 is connected to the chain drive assembly 250 and extends into the upper chamber 610. The lead screw pair 712 is disposed in the isolating contact 740 and cooperates with the lead screw 711. The lead screw 711 drives the isolating contact 740 to move through the lead screw pair 712. The movement of the lead screw 711 driving the isolating contact 740 realizes the opening and closing and grounding operation of the isolating switch mechanism 700. The movement is achieved by the rotation of the lead screw 711 driving the lead screw pair 712 and the isolating contact 740 fixed on the lead screw pair 712 to move together. The isolating contact 740 is equipped with watch strap fingers at both ends for conducting the circuit between the isolating contact 740 and other components. When the isolating contact 740 moves to abut against the upper outgoing conductor 730, this position is the conducting state of grounding open and isolating closed; when the isolating contact 740 moves to separate it from the upper outgoing conductor 730, this position is the isolating state of grounding open and isolating open; when the isolating contact 740 moves to the left side of the upper chamber 610, this position is the grounding conducting state of grounding closed and isolating open.

[0090] The vacuum switch mechanism 800 includes a lever mechanism 810, a vacuum interrupter 820, a moving contact 830, a stationary contact 840, a lower lead conductor 850, and a main circuit conductor 860, all disposed in the lower chamber 620. The vacuum interrupter 820 contains the moving contact 830 and the stationary contact 840. The moving contact 830 is connected to or disconnected from the stationary contact 840 by the lever mechanism 810. The lower lead conductor 850 is installed in the lower lead outlet 621 and is connected to the stationary contact 840. The main circuit conductor 860 is installed in the main circuit interface 622 and is connected to the lower lead conductor 850. A flexible connection 930 is provided on the lower conductor 920, and the lever mechanism 810 is connected to the flexible connection 930.

[0091] In this embodiment, the insulating housing 600 is provided with a first observation window 630 and a second observation window 640 for observing the opening and closing of the circuit breaker and grounding. The first observation window 630 and the second observation window 640 are sealed by a transparent cover plate 650. By setting the observation window and the transparent cover plate 650, the switching mode of the three positions inside the disconnecting switch mechanism 700 can be observed, thereby better understanding the isolation and grounding status of the disconnecting switch mechanism 700. Specifically, when the isolating contact 740 moves to the conducting position, the first observation window 630 coincides with the middle section of the isolating contact 740. By applying a paint layer (such as a red paint layer) to the middle section of the isolating contact 740, the red color displayed by the isolating contact 740 in the first observation window 630 indicates that the switch is in the conducting state. When the isolating contact 740 moves to the ground position, the second observation window 640 coincides with the left end of the isolating contact 740. By applying a paint layer (such as a yellow-green paint layer) to the left section of the isolating contact 740, the yellow-green color displayed by the isolating contact 740 in the second observation window 640 indicates that the switch is in the grounding state. If neither red nor yellow-green color is visible, the switch is in the isolating state.

[0092] In this embodiment, the upper chamber 610 and the lower chamber 620 are arranged side by side, with the portion of the upper chamber 610 housing the isolation cylinder 720 and the portion of the lower chamber 620 housing the vacuum interrupter 820 separated from each other. This arrangement isolates the two main heat-generating parts of the insulating housing 600, reducing the product's temperature rise. Simultaneously, there are three circuit breaker modules, corresponding to the three phases. A partition 102 is inserted between each circuit breaker module to separate the isolation cylinder 720 portion and the vacuum interrupter 820 portion. The partition 102 is fixed by a bracket 103. The inserted partition 102 effectively isolates the mutual influence of the magnetic fields generated by each circuit breaker module during use.

[0093] In this embodiment, both the upper chamber 610 and the lower chamber 620 are through-hole structures, and the upper outgoing conductor 730, the lower outgoing conductor 850, and the main circuit conductor 860 are all straight round rod structures. Compared with the curved and irregularly shaped conductor structures of similar solid insulation modules, the straight round rod conductor structure reduces the processing difficulty and cost of the conductor, and also reduces the requirements for the APG process (automatic pressure gelation process of epoxy resin), which greatly improves the production qualification rate of the circuit breaker module 30 and significantly reduces the manufacturing difficulty and cost.

[0094] A first shielding cover 911 is provided on the side of the upper conductor 910, second shielding covers 721 are provided at both ends of the isolation cylinder 720, a third shielding cover 731 is provided on the side of the upper outgoing conductor 730, a fourth shielding cover 851 is provided on the side of the lower outgoing conductor 850, and a fifth shielding cover 861 is provided outside the main circuit conductor 860. All shielding covers 911 to 861 are cylindrical structures. A sixth shielding cover 940 is provided outside the lower conductor 920 and the vacuum interrupter 820. The sixth shielding cover 940 includes a first cover 941 and a second cover 942, both of which are integrally formed. The first cover 941 covers the lower conductor 920 and the flexible connection 930, while the second cover 942 covers the side of the vacuum interrupter 820. The placement of these shielding covers ensures a more uniform electric field within the insulating shell 600, preventing partial discharge during operation, enhancing product safety and reliability, and extending service life.

[0095] The working principle of this invention is as follows:

[0096] Move the interlock plate 440 all the way to the right so that the operating hole 441 is no longer engaged with the bayonet 313, and align the large hole of the operating hole 441 with the stop sleeve 310 so that the operating shaft 320 can be rotated after the handle is inserted (the handle head is designed with a square hole that matches the operating shaft 320).

[0097] When the handle is inserted into the operating shaft 320, the stop sleeve 310 moves forward under the pushing force of the handle, compressing the return spring 330. Then, when the handle is cranked, and the isolation device is operated from the contact position or the conducting position to the intermediate isolation position, the screw 220 drives the drive plate 540. The drive plate 540 causes the first drive rod 522 to move downward along the U-shaped opening 544, causing the first swing plate 520 to swing to one side. The swing of the first swing plate 520 causes the second drive rod 523 to move downward. The second swing plate 530 swings downward under the action of the third spring 533, thereby causing the stop pin 510 to move downward along the limiting opening 122 with the second swing plate 530, and forming a limit on the bearing 340 on the stop sleeve 310. At this time, the handle should not be cranked further (e.g., ...). Figure 27 (As shown).

[0098] After the handle is pulled out, the stop sleeve 310 moves backward under the action of the return spring 330. At the same time, its triangular guide port 311 is limited by the positioning pin 324. The stop sleeve 310 drives the bearing 340 to rotate, avoiding the stop pin 510. At this time, the isolation device has completed its operation to the isolation position (e.g., Figure 28 As shown in the figure, at the same time, the screw mechanism 710 connected to the chain drive assembly 250 also performs synchronous operation to complete the connection or disconnection between the isolation contact 740 and the upper lead conductor 730.

[0099] To move the isolating device from the intermediate isolating position to the conducting or contacting position, the handle must be reinserted into the operating shaft 320 and the handle turned. At this point, the bearing 340 completely avoids the stop pin 510, and the isolating device can be moved to the contacting or conducting position by turning the handle (e.g., ...). Figure 29 As shown in the figure, at the same time, the screw mechanism 710 connected to the chain drive assembly 250 also performs synchronous operation to complete the connection or disconnection between the isolation contact 740 and the upper lead conductor 730.

[0100] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A fully grounded, fully shielded, isolating circuit breaker, characterized in that: The device includes a housing and an isolation device. The isolation device includes a mounting base, a transmission mechanism, an operating mechanism, and a workstation switching mechanism. The mounting base is fixed in the housing, the transmission mechanism is disposed in the mounting base, and the operating mechanism includes a stop sleeve and an operating shaft. The stop sleeve is rotatably disposed in the mounting base, and the operating shaft is sleeved in the stop sleeve. Driving the operating shaft can drive the transmission mechanism to move. The workstation switching mechanism includes a position indicator and a limiting member. The position indicator moves linearly along the length of the mounting base with the transmission mechanism. The front end of the limiting member is detachably fixed to the top of the housing, and the rear end extends above the transmission mechanism to prevent the transmission mechanism from switching to the contact position. The transmission mechanism includes a motor, a screw, a slider, and a chain drive assembly. The motor and screw are disposed in the mounting base. The motor drives the screw. The slider is slidably engaged with the screw. After driving the operating shaft, the slider can drive the screw to move. The position indicator is fixed together with the slider. The isolation device also includes a limiting mechanism disposed in the mounting base to limit the rotation angle of the operating shaft. The chain drive assembly is connected to the operating shaft. The mounting base includes a front fixing plate, a middle fixing plate, a connecting block, and a rear fixing plate arranged side by side. The stop sleeve passes through the front fixing plate and the middle fixing plate. A set of the connecting blocks is fixed between the middle fixing plate and the rear fixing plate. The limiting mechanism is disposed between the middle fixing plate and the rear fixing plate. The screw is disposed on the connecting block. The top of the housing is provided with an opening for the limiting member to pass through. The rear fixing plate is provided with a plug-in interface, which is located below the screw. The front end of the limiting member is detachably fixed by a lock, and the rear end of the limiting member is inserted into the plug-in interface.

2. The fully grounded and fully shielded isolation circuit breaker as described in claim 1, characterized in that: The operating mechanism further includes a return spring. The operating shaft includes a plug-in section, a connecting section, and a driving section arranged sequentially. The plug-in section has a square cross-sectional shape. The plug-in section and the connecting section are fitted into the stop sleeve. A positioning pin is inserted into the connecting section. The stop sleeve is provided with a guide opening. The positioning pin is located in the guide opening. The stop sleeve is provided with a mounting part on its circumferential surface near the guide opening. A bearing is connected to the mounting part by a pin. The return spring is fitted into the connecting section, and its two ends abut against the driving section and the stop sleeve, respectively.

3. The fully grounded and fully shielded isolation circuit breaker as described in claim 1, characterized in that: A connecting plate is fixed to the slider, and the position indicator is fixed to the end of the connecting plate. A guide plate is provided at the bottom of the connecting plate. A front guide opening is provided on the front fixed plate along its length direction, and the guide plate can move along the front guide opening. A rear guide opening is provided on the rear fixed plate along its length direction, and the connecting plate is inserted into the rear guide opening and can move along the rear guide opening. A guide protrusion is provided on the side of the slider, and a middle guide opening is provided on the middle fixed plate along its length direction, and the guide protrusion can move along the middle guide opening.

4. A fully grounded, fully shielded isolation circuit breaker as described in claim 2, characterized in that: The limiting mechanism includes a stop pin, an actuator, and a drive plate. The stop pin passes through the middle fixed plate, and the operating shaft drives the stop pin to move up and down to block or allow the bearing to pass. The actuator includes a first swing plate and a second swing plate. The middle part of the first swing plate is hinged to the rear fixed plate through a first column. A first drive rod, a second drive rod, and a third drive rod are respectively provided on the first swing plate. The first and second drive rods are located on both sides of the first column, and the third drive rod is located below the first drive rod. The sides of the first and second drive rods are respectively... The device is provided with a second column and a third column. A first spring and a second spring are connected between the first drive rod and the second column, and between the second drive rod and the third column, respectively. One end of the second swing plate is hinged to the rear fixed plate through a fourth column, and connected to its side through a fifth column and a third spring. A stop pin is provided at the other end of the second swing plate. The second drive rod abuts against the bottom of the second swing plate. The drive plate is movably provided in the rear fixed plate and is driven by the slider. The first column and the first drive rod are respectively inserted into the drive plate.

5. A fully grounded, fully shielded isolation circuit breaker as described in claim 1, characterized in that: The limiting component includes a mounting plate and a plug-in plate. The plug-in plate includes a plug-in body and a plug-in part. The front end of the plug-in body connects to the mounting plate, and the rear end extends to form the plug-in part. The access lock includes a lock seat and a locking member. The lock seat is disposed on the top of the mounting plate. The locking member locks the lock seat and the mounting plate to the top of the housing. The locking member includes a locking rod and a nut. The lock seat is provided with a lock hole, and the mounting plate is provided with a connecting hole. The locking rod passes through the lock hole and the connecting hole, and the mounting plate is locked to the top of the housing by the nut that cooperates with it.

6. A fully grounded, fully shielded, isolating circuit breaker as described in claim 1, characterized in that: It also includes a circuit breaker module, which comprises an insulating housing, a disconnecting switch mechanism, a vacuum switch mechanism, and connecting conductors. The insulating housing is made of epoxy resin material and coated with a semiconductor coating. The insulating housing has an upper chamber and a lower chamber. The disconnecting switch mechanism is located on the left side of the upper chamber, and an upper outlet is located on the right side of the upper chamber. The vacuum switch mechanism is located on the left side of the lower chamber, and a lower outlet is located on the right side of the lower chamber. A main circuit interface is located on the side of the lower outlet in the lower chamber. The connecting conductors include an upper conductor and a lower conductor that are electrically connected to each other. The upper conductor is located in the upper chamber, and the lower conductor is located in the lower chamber.

7. A fully grounded, fully shielded isolation circuit breaker as described in claim 6, characterized in that: The disconnecting switch mechanism includes a lead screw mechanism, an isolation cylinder, an upper lead conductor, and an isolation contact disposed in the upper chamber. The lead screw mechanism is connected to a transmission mechanism. The upper and lower conductors are a T-shaped integrated structure. The upper conductor is a hollow cylindrical structure. The isolation cylinder is disposed on the side of the upper conductor. The upper lead conductor is installed in the upper lead outlet. The isolation contact is disposed in the upper conductor and the isolation cylinder, and is driven by the lead screw mechanism to connect or disconnect with the upper lead conductor. The vacuum switch mechanism includes... The system includes a pull rod mechanism, a vacuum interrupter, a moving contact, a stationary contact, a lower lead conductor, and a main circuit conductor, all housed in the lower chamber. The vacuum interrupter contains the moving and stationary contacts. The moving contact is connected to or disconnected from the stationary contact via the pull rod mechanism. The lower lead conductor is installed in the lower lead outlet and is connected to the stationary contact. The main circuit conductor is installed in the main circuit interface and is connected to the lower lead conductor. A flexible connection is provided on the lower conductor, and the pull rod mechanism is connected to the flexible connection.

8. A fully grounded, fully shielded isolation circuit breaker as described in claim 7, characterized in that: A first shielding cover is provided on the side of the upper conductor, a second shielding cover is provided at each end of the isolation cylinder, a third shielding cover is provided on the side of the upper outgoing conductor, a fourth shielding cover is provided on the side of the lower outgoing conductor, and a fifth shielding cover is provided outside the main circuit conductor. All the first to fifth shielding covers are cylindrical structures. A sixth shielding cover is provided outside the lower conductor and the vacuum interrupter. The sixth shielding cover includes a first cover and a second cover with an integral structure. The first cover covers the lower conductor and the flexible connection, and the second cover covers the side of the vacuum interrupter.

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