A pole-mounted circuit breaker with a built-in rotary disconnect switch

Abstract

A pole-mounted circuit breaker with a built-in rotary disconnector, wherein the circuit breaker includes a sealed pole assembly, a disconnector assembly, an isolating knife static contact support, an outlet bushing, an incoming bushing, a housing, a spring operating mechanism, and a transmission assembly; the outlet bushing and the incoming bushing are arranged on the outside of the housing, and pass through the housing to be connected to the sealed pole assembly and the isolating knife static contact support, respectively; the spring operating mechanism is connected to the transmission assembly and the disconnector assembly, and drives the insulating pull rod and directly drives the isolating switch assembly to move in a directional manner through the transmission assembly; during the directional movement, the movement of the moving contact and the isolating knife of the vacuum interrupter is driven, and the opening and closing operations between the moving contact and the static contact of the vacuum interrupter and between the isolating knife and the incoming conductive rod on the isolating knife static contact support are realized. The pole-mounted circuit breaker of the present invention has a simple structure, a small size, a small number of components, high reliability, and a long service life.

Description

Technical Field

[0001] The present invention relates to the field of power grid equipment, and more particularly to a pole-mounted circuit breaker with a built-in rotary disconnect switch. Background Art

[0002] Conventional circuit breakers are often overly large, with complex component structures, including multi-layered isolation shells. These components also require ample space between each other for convenient and accurate assembly. For example, in background document CN109065402A, to prevent current leakage, a circuit breaker structure is provided, including an aluminum alloy housing 13, an insulating box 28, a first insulating box specifically for housing the knife holder and rotary knife switch, and a second insulating box specifically for housing the knife switch contacts and right conductive member 17. This structure significantly hinders reducing the size of the circuit breaker.

[0003] Furthermore, to achieve precise separation and connection between the isolating blade and the blade holder, if the circuit breaker is too small, the assembly process will be significantly inconvenient, wasting both time and labor costs. During the assembly process, multiple disassembly and assembly may be necessary, yet ensuring the effective operation of the circuit breaker remains difficult. Consequently, reducing the size of the circuit breaker also introduces inconveniences in installation and significantly increases costs.

[0004] In order to solve the problems in the prior art, a new pole-mounted circuit breaker with a built-in rotary disconnect switch is urgently needed. Summary of the Invention

[0005] In order to address the deficiencies in the prior art, the purpose of the present invention is to provide a pole-mounted circuit breaker with a built-in rotary disconnector, which realizes the closing and opening of the vacuum interrupter for rated current and short-circuit current, and the isolation of the disconnector for high voltage through the connection relationship between the sealed pole assembly, the disconnector assembly, the transmission assembly and the spring operating mechanism.

[0006] The present invention adopts the following technical solutions.

[0007] A pole-mounted circuit breaker with a built-in rotary disconnector, the circuit breaker comprising a sealed pole assembly, a disconnector assembly, an isolating knife static contact support, an outgoing line bushing, an incoming line bushing, a housing, a spring operating mechanism and a transmission assembly; wherein the outgoing line bushing and the incoming line bushing are arranged on the outside of the housing and pass through the housing to be connected to the sealed pole assembly and the isolating knife static contact support arranged inside the housing respectively; the spring operating mechanism is connected to the transmission assembly and the disconnector assembly respectively, and drives the insulating pull rod in the sealed pole assembly for directional movement through the transmission assembly, and directly drives the isolating switch assembly for directional movement; during the directional movement, the insulating pull rod in the sealed pole assembly and the disconnector assembly respectively drive the movement of the moving contact and the isolating knife of the vacuum interrupter, and realize the opening and closing operations between the moving contact and the static contact of the vacuum interrupter, and between the isolating knife and the incoming line conductive rod on the isolating knife static contact support.

[0008] Preferably, the circuit breaker further comprises a current transformer, which is sleeved on the portion of the outlet bushing located inside the housing and fixed to the housing.

[0009] Preferably, the sealed pole assembly includes an upper outlet, a lower outlet, a flexible connection, an insulating pull rod, an epoxy resin cast shell, a vacuum arc chamber and a conductive rod; wherein, a moving contact and a static contact are provided in the vacuum arc chamber, the moving contact passes through the top of the vacuum arc chamber, and the static contact passes through the bottom of the vacuum arc chamber; the upper outlet is fixedly connected to the static contact through a bolt, and the insulating pull rod passes through the hole at one end of the flexible connection and is fixedly connected to the moving contact; the lower outlet is connected to the other end of the flexible connection through a bolt to be arranged on the side of the vacuum arc chamber and the insulating pull rod, thereby supporting the access of the conductive rod; the epoxy resin cast shell wraps the vacuum arc chamber and partially wraps the upper outlet and the lower outlet.

[0010] Preferably, one end of the upper outgoing line away from the vacuum interrupter is set to a hollow flat shape to achieve an articulated connection with one end of the isolating knife in the disconnector assembly; the insulating pull rod in the sealed pole assembly drives the opening and closing operations of the moving contact and the static contact in the vacuum interrupter based on directional movement.

[0011] Preferably, the top end of the insulating pull rod is located outside the epoxy resin casting shell and passes through the pin of the three-phase crank arm in the transmission assembly to achieve directional movement under the transmission of the transmission assembly.

[0012] Preferably, the isolating switch assembly includes multiple groups of symmetrically arranged isolating knives, operating shafts, limit blocks, equalizing bolts and compression springs; wherein, the multiple groups of isolating knives are fixed on the operating shaft to achieve relative position fixation with the shell; each group of isolating knives includes two isolating knives placed in a symmetrical structure, and the symmetrically placed isolating knives are symmetrically grouped by equalizing bolts and compression springs arranged at the head and tail ends; wherein, the equalizing bolt at the head end passes through the symmetrically placed isolating knives and the limit block placed between the isolating knives; the equalizing bolt at the tail end passes through the symmetrically placed isolating knives and the end of the upper outlet between the isolating knives.

[0013] Preferably, the operating shaft is clamped on the housing through two shaft ends; a plurality of trapezoidal cavities with hollow interiors are provided on the top of the operating shaft, and each set of symmetrically placed isolation blades passes through a trapezoidal cavity.

[0014] Preferably, the outlet bushing includes an outlet conductive core, an outlet epoxy resin casting, an outlet silicone rubber jacket, an outlet high-voltage shielding net and an outlet low-voltage shielding net; wherein, the outlet conductive core is provided with a cup-shaped structure on one end close to the shell, for accommodating the contact finger connected to one end of the conductive rod on the sealed pole assembly.

[0015] Preferably, the static contact support for the isolating blade includes a voltage sensor, an incoming line conductive rod, and an epoxy support. The epoxy support is fixed to the bottom of the housing. One end of the incoming line conductive rod is transversely positioned within the epoxy support, and the other end is fixed to the inside of the incoming line bushing. The rod is configured to function as a static contact when the isolating blade is moved closest to the epoxy support. The voltage sensor is encapsulated within the epoxy support and connected to the incoming line conductive rod via a wire.

[0016] Preferably, the incoming line bushing includes an incoming line conductive core, an incoming line epoxy resin casting, an incoming line silicone rubber jacket, and an incoming line low-voltage shielding net; wherein, the end of the incoming line conductive core close to the shell is set as a cup-shaped structure for accommodating the incoming line conductive rod and its contact fingers on the isolating knife static contact support.

[0017] Preferably, the transmission assembly includes a spline main shaft, a three-phase transmission crank arm, a trip spring crank arm, a trip spring, a bracket, and a pin; wherein, the spline main shaft is fixed to the housing through the bracket, and the three-phase transmission crank arm and the trip spring crank arm are alternately sleeved on the spline main shaft in sequence; the pin on the three-phase transmission crank arm is used to pass through the insulating pull rod on the sealed pole assembly; the pin of the trip spring crank arm passes through the trip spring, and the other end of the trip spring is hung on the housing.

[0018] The beneficial effects of the present invention are that, compared with the prior art, the pole-mounted circuit breaker with a built-in rotary disconnector can, through the connections between the sealed pole assembly, the disconnector assembly, the transmission assembly, and the spring operating mechanism, achieve the closing and opening of the vacuum interrupter for rated current and short-circuit current, as well as the isolation of the disconnector for high voltage. The pole-mounted circuit breaker of the present invention has a simple structure, a small size, a small number of components, high reliability, and a long service life.

[0019] The beneficial effects of the present invention also include:

[0020] 1. By adjusting the connecting bolts of the transmission assembly and the insulating pull rod, the present invention allows for quick adjustment of the circuit breaker's open distance and overtravel, improving assembly and adjustment efficiency while reducing maintenance and operating costs. Furthermore, the integrated design of the operating shaft of the disconnector assembly avoids the dimensional errors and reduced strength associated with separate designs, improving assembly efficiency.

[0021] 2. In the present invention, one or more layers of shielding nets, such as a high-voltage shielding net and a low-voltage shielding net, are built into the outlet bushing, which reduces the local electric field strength of the circuit breaker and the size of the circuit breaker housing, so that a small-sized circuit breaker can also have good working performance and reduce the manufacturing cost of the product.

[0022] 3. The present invention incorporates a voltage sensor into the static contact support of the isolating blade, eliminating the need for a separate voltage sensor inside the housing. This reduces the space occupied by electrical components within the housing and reduces product manufacturing costs. By integrating the voltage sensor into the static contact support of the isolating blade, the voltage sensor is integrated, protecting it from interference from external electromagnetic radiation and providing a favorable operating environment, thereby improving the testing accuracy of the voltage sensor.

[0023] 4. In the present invention, grounding points are provided on both sides of the isolating switch and the isolating switch static contact support. For example, one side of the isolating switch is connected to the equipment housing through the sealed pole assembly, while the other side of the isolating switch static contact support is also connected to the equipment housing through the epoxy support. Since the charge on the equipment housing can be grounded, the "false break" problem caused by installing the isolating switch and the isolating switch static contact support on the same insulator during opening and closing operations is prevented, thereby improving the safety of the circuit breaker.

[0024] 5. In the prior art, insulating rods are typically arranged horizontally, requiring parameter adjustments during circuit breaker assembly. In contrast, in the present invention, the insulating rods are arranged vertically, with one end positioned at the top of the housing's interior. This allows installers to easily and accurately determine the relative positions of the insulating rods, vacuum interrupter, and other components, ensuring proper circuit breaker operation with a single installation. This significantly reduces labor costs for both maintenance and installation personnel and enables mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the overall assembly structure of a pole-mounted circuit breaker with a built-in rotary disconnect switch according to the present invention;

[0026] Figure 2 This is a schematic diagram of the main circuit assembly structure of a pole-mounted circuit breaker with a built-in rotary disconnect switch according to the present invention;

[0027] Figure 3 This is a structural schematic diagram of a sealed pole assembly in a pole-mounted circuit breaker with a built-in rotary disconnect switch according to the present invention;

[0028] Figure 4 This is a structural schematic diagram of an isolating switch assembly in a pole-mounted circuit breaker with a built-in rotary isolating switch according to the present invention;

[0029] Figure 5 This is a structural schematic diagram of an outlet bushing in a pole-mounted circuit breaker with a built-in rotary disconnect switch according to the present invention;

[0030] Figure 6 This is a structural schematic diagram of a static contact support of an isolating knife in a column-mounted circuit breaker with a built-in rotary isolating switch according to the present invention;

[0031] Figure 7 This is a structural schematic diagram of an incoming bushing in a pole-mounted circuit breaker with a built-in rotary disconnect switch according to the present invention;

[0032] Figure 8 The present invention is a structural schematic diagram of a transmission assembly in a pole-mounted circuit breaker with a built-in rotary disconnect switch.

[0033] Reference numerals:

[0034] 1-sealed pole assembly, 2-isolating switch assembly, 3-spring operating mechanism, 4-outlet bushing, 5-isolating knife static contact, 6-housing, 7-inlet bushing, 8-current transformer, 9-transmission assembly;

[0035] 11-upper outlet, 12-lower outlet, 13-flexible connection, 14-insulating pull rod, 15-epoxy resin casting shell, 16-vacuum interrupter, 17-conducting rod;

[0036] 21-isolating knife, 22-operating shaft, 23-limiting block, 24-equalizing bolt, 25-compression spring;

[0037] 41-outgoing line conductive rod, 42-outgoing line epoxy resin casting, 43-outgoing line silicone rubber jacket, 44-outgoing line high-voltage shielding net, 45-outgoing line low-voltage shielding net;

[0038] 51-voltage sensor, 52-conductive rod, 53-epoxy support;

[0039] 71-incoming wire conductive rod, 72-incoming wire epoxy resin casting, 73, incoming wire silicone rubber jacket, 74-incoming wire shielding net;

[0040] 91-spline main shaft, 92-three-phase transmission crank arm, 93-opening spring crank arm, 94-opening spring, 95-spacer, 96-bracket, 97-pin, 98-nut. DETAILED DESCRIPTION

[0041] The present application will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present application.

[0042] Figure 1 The figure is a schematic diagram of the overall assembly structure of a pole-mounted circuit breaker with a built-in rotary disconnect switch according to the present invention. Figure 2 This is a schematic diagram of the main circuit assembly structure of a column mounted circuit breaker with a built-in rotary isolating switch according to the present invention. Figure 1 and Figure 2 As shown, a pole-mounted circuit breaker with a built-in rotary disconnector, wherein the circuit breaker includes a sealed pole assembly 1, an disconnector assembly 2, an isolating knife static contact support 5, an outgoing bushing 4, an incoming bushing 7, a shell 6, a spring operating mechanism 3 and a transmission assembly 9; wherein the outgoing bushing 4 and the incoming bushing 7 are arranged on the outside of the shell 6, and pass through the shell 6 and are fixedly connected to the sealed pole assembly 1 and the isolating knife static contact support 5 arranged inside the shell 6; the spring operating mechanism 3 is connected to the transmission assembly 9 and the disconnector assembly 2, and drives the insulating pull rod 14 in the sealed pole assembly 1 to move in a directional manner through the transmission assembly 9, and directly drives the isolating switch assembly 2 to move in a directional manner; during the directional movement, the insulating pull rod 14 in the sealed pole assembly 1 and the disconnector assembly 2 respectively drive the movement of the moving contact and the isolating knife 21 of the vacuum interrupter, and realize the opening and closing operations between the moving contact and the static contact of the vacuum interrupter, and between the isolating knife 21 and the incoming conductive rod 52 on the isolating knife static contact support 5.

[0043] It is understandable that the pole-mounted circuit breaker used in the present invention can integrate the functions of the pole-mounted circuit breaker and the disconnector into one, thereby enabling the circuit breaker to perform opening and closing operations for rated current and short-circuit current, and the disconnector to perform isolation operations for high voltage.

[0044] Specifically, in the present invention, the components constituting the circuit breaker and the disconnector can be arranged inside the housing structure. The housing 6 used in the present invention can be an assembled or integrally formed structure. Specifically, the housing 6 in the present invention can be made of a metal that is not easily deformed and has a conductive function. Figure 2 As shown, the exterior of the housing 6, for example, the exterior of one side, may further be fixedly mounted with a spring operating mechanism 3 to control the transmission mechanism 9 and the disconnector assembly 2 within the housing. A base bracket may be provided at the bottom of the housing to set the height of the housing or the contact method between the housing and the ground or other equipment.

[0045] In order to realize the function of the circuit breaker in the present invention, one or more bushings can be respectively provided on two opposite sides of the housing 6, serving as the incoming bushing 7 and the outgoing bushing 4, respectively. Figure 2 As shown in the figure, the bushing on the left side of the housing is the incoming wire bushing, and the bushing on the right side of the housing is the outgoing wire bushing. After the two bushings pass through the housing, they are connected to the components inside the housing.

[0046] It is understood that the spring operating mechanism 3 of the present invention is primarily composed of two parts: a circuit breaker operating mechanism and an isolating operating mechanism. The circuit breaker operating mechanism can be connected to the splined main shaft 91 in the transmission assembly 9 via a sealing flange, thereby driving the splined main shaft 91 and other components in the transmission assembly 9 in directional rotation. The isolating mechanism can be connected to the operating shaft 22 in the isolating switch assembly 2 via a sealing flange, thereby driving its directional rotation.

[0047] Specifically, both of the above-mentioned operating mechanisms include an energy storage spring and a spring retaining system. The energy storage spring can be compressed and stored energy under manual or motor drive. After the energy storage is completed, the energy storage spring is kept in a compressed state under the action of the spring retaining system. When the circuit breaker needs to be closed, the spring retaining system rotates to release the energy stored in the energy storage spring.

[0048] It should be noted that a specific operating sequence is achieved between the two operating mechanisms in the spring operating mechanism 3 through structural design. For example, the circuit breaker operating mechanism can only close the circuit breaker after the isolating switch in the isolating operating mechanism has closed the circuit breaker; and the isolating operating mechanism can only open the circuit breaker after the circuit breaker operating mechanism has opened the circuit breaker.

[0049] Regarding the circuit breaker operating mechanism, when the circuit breaker needs to be closed, the stored energy spring releases energy, and the operating mechanism, under the action of the stored energy spring, drives the transmission assembly 9 to move in a certain direction. At this time, the opening spring 94 in the transmission assembly will be in a stretched state. When the circuit breaker needs to be opened, the spring retention system will rotate, and the transmission component 9 will return to the open state under the tension of the opening spring 94.

[0050] For the isolation operating mechanism, a spring is provided inside. When the closing operation or the opening operation occurs, the closing and opening shaft can be rotated to drive the crank arm welded on the closing and opening shaft to compress the spring storage capacity and make the spring rotate around the crank arm. When the spring rotates to a certain angle and the crank arm can no longer compress the spring, the spring releases its capacity and drives the sealing flange to rotate. The sealing flange drives the operating shaft of the isolation switch assembly to rotate, thereby realizing the closing and opening of the isolation switch. In the present invention, the incoming bushing 7 is fixedly connected to the isolation knife static contact support 5 arranged inside the shell and fixed to the bottom of the shell. The outgoing bushing 4 is fixedly connected to the sealed pole assembly 1. Among them, the part of the structure where the outgoing bushing 4 passes through the shell and enters the interior of the shell can also be provided with a current transformer 8.

[0051] Preferably, the circuit breaker further includes a current transformer 8 , which is sleeved on the portion of the outlet bushing 4 located inside the housing 6 and fixed on the housing 6 .

[0052] By fixing the current transformer and the outlet bushing in this manner, the current transformer 8 can measure the current in the conductive core inside the outlet bushing 4 .

[0053] Figure 3 This is a structural diagram of a sealed pole assembly in a pole-mounted circuit breaker with a built-in rotary disconnector according to the present invention. Figure 3 As shown, preferably, the sealed pole assembly 1 includes an upper outlet 11, a lower outlet 12, a flexible connection 13, an insulating rod 14, an epoxy resin cast shell 15, a vacuum interrupter 16 and a conductive rod 17; wherein, a moving contact and a static contact are provided in the vacuum interrupter 16, the moving contact passes through the top of the vacuum interrupter 16, and the static contact passes through the bottom center of the vacuum interrupter 16; the upper outlet 11 is fixedly connected to the static contact passing through the bottom of the vacuum interrupter 16 through a bolt, and the insulating rod 14 passes through the hole at one end of the flexible connection 13 and is fixedly connected to the moving contact; the lower outlet 12 is connected to the other end of the flexible connection 13 through a bolt to be arranged on the side of the vacuum interrupter 16 and the insulating rod 14, thereby supporting the access of the conductive rod 17; the epoxy resin cast shell 15 wraps the vacuum interrupter 16, and partially wraps the upper outlet 11 and the lower outlet 12.

[0054] Specifically, the epoxy resin cast shell 15 can isolate the components inside it from the dry air or nitrogen in the external environment. Since the interior of the epoxy resin cast shell 15 includes components such as the upper outlet line 11, the lower outlet line 12, the insulating pull rod 14, etc. where leakage may occur, the leakage generated inside the sealed pole assembly 1 can also be isolated within the epoxy resin cast shell 15 in this way.

[0055] It's important to note that the "encapsulation" mentioned here doesn't imply a vacuum-tight enclosure; the interior of the epoxy resin-cast housing 15 may also include a cavity that doesn't contact its internal components. Specifically, the flexible connector 13 and insulating rod 14 are located within the cavity formed during the casting of the epoxy resin-cast housing 15, rather than being encapsulated by it. Due to the flexible connector's position, when the insulating rod 14 moves the arc extinguishing chamber's moving contact, the flexible connector also undergoes directional movement, allowing it to move up and down.

[0056] It is understood that, due to the presence of a flexible connection 13 between the insulating rod 14 and the vacuum interrupter 16, when the insulating rod 14 and the moving contact of the vacuum interrupter 16 undergo directional movement under the action of the transmission assembly 9, the flexible connection can bend, thereby ensuring that the lower outlet is fixed to the epoxy resin casting housing 15 and its relative position with respect to the outlet bushing 4 remains unchanged.

[0057] In the present invention, due to the functions of the insulating pull rod 14 and the vacuum interrupter 16, the electrical components in the circuit breaker are insulated from the housing 6, thereby ensuring the safety of the equipment and the accuracy of the outgoing line signal.

[0058] Preferably, one end of the upper outlet 11 away from the vacuum interrupter 16 is set to a hollow flat shape to achieve an articulated connection with one end of the isolating knife 21 in the disconnector assembly 2; the directional movement of the insulating pull rod 14 in the sealed pole assembly 1 drives the opening and closing operations of the moving contact and the static contact in the vacuum interrupter 16.

[0059] Specifically, when the insulating rod 14 moves downward, the moving contact in the vacuum interrupter 16, to which one side of its bottom end is connected, moves downward accordingly, making contact with the stationary contact in the vacuum interrupter 16, thereby closing the circuit breaker. Conversely, when the insulating rod 14 drives the moving contact in the vacuum interrupter upward, the moving and stationary contacts in the vacuum interrupter separate, and the circuit breaker opens.

[0060] Preferably, the top end of the insulating pull rod 14 is located outside the epoxy resin casting shell 15 and passes through the pin 97 of the three-phase crank arm 92 in the transmission assembly 9 to achieve directional movement under the transmission of the transmission assembly 9.

[0061] It is understood that the insulating pull rod 14 is fixed to the transmission assembly 9, and the transmission assembly 9 drives the moving contact of the vacuum interrupter 16 to move up and down, thereby achieving the opening and closing operations of the circuit breaker. During the directional movement of the disconnector assembly 2, the incoming conductive rod 52 on the disconnector static contact support 5 and the disconnector 21 on the disconnector assembly 2 are opened and closed.

[0062] Figure 4 This is a structural diagram of the isolating switch assembly in a column mounted circuit breaker with a built-in rotary isolating switch according to the present invention. Figure 4 As shown, preferably, the isolating switch assembly 2 includes multiple groups of symmetrically arranged isolating knives 21, operating shafts 22, limit blocks 23, equalizing bolts 24 and compression springs 25; wherein, the multiple groups of isolating knives 21 are fixed on the operating shafts 22 to achieve relative position fixation with the housing 6; each group of isolating knives 21 includes two isolating knives 21 placed in a symmetrical structure, and the symmetrically placed isolating knives 21 are symmetrically grouped by equalizing bolts 24 and compression springs 25 arranged at the head and tail ends; the equalizing bolt 24 at the head end passes through the symmetrically placed isolating knives 21 and the limit block 23 placed between the isolating knives 21; the equalizing bolt 24 at the tail end passes through the symmetrically placed isolating knives 21 and the end of the upper outlet line 11 between the isolating knives 21.

[0063] Each set of spacer blades 21 includes two blades, positioned parallel and symmetrically. Since each set of blades typically has an opening at the head and tail ends, equalizing bolts can be placed in these openings to group the two blades together. To provide preload between the two blades, a compression spring 25 can be placed on the outside of each blade.

[0064] At the same time, the end of the blade close to the sealed pole assembly 1 can be called the blade tail end, and the end close to the isolating knife static contact pillar 5 can be called the blade head end. Since the head end of the blade should be used to accommodate the incoming conductive rod 52 on the isolating knife static contact pillar 5, a limit block can be set between the blades at the head end. The limit block makes the distance between the two symmetrically arranged isolating knives slightly smaller than the thickness of the incoming conductive rod, so that when the isolating knife is in the closed position, the isolating knife and the incoming conductive rod have sufficient contact pressure under the action of the compression spring. At the tail end of the blade, the end of the upper outlet 11 can be set between the two isolating knives. A protrusion can also be set at the hinged part of the isolating knife and the upper outlet so that sufficient contact pressure is maintained between the isolating knife and the upper outlet under the action of the compression spring. Since the end of the upper outlet 11 is set to a hollow flat shape, the equalizing bolt at the tail end of the isolating knife can pass through the end of the upper outlet between the blades, so that the isolating knife and the upper outlet are hinged.

[0065] Typically, because the end of the upper conductor is thin, an arc-shaped protrusion can be provided around the opening at the blade's rear end to accommodate the width of the stopper, thereby maintaining relative stability. Once articulated, the disconnector assembly 2 can rotate around the hole at the upper conductor end. When the disconnector rotates until it contacts the static contact support 5, the circuit breaker is closed; when it rotates to a separated position, the circuit breaker is opened.

[0066] Preferably, the operating shaft 22 is clamped on the housing 6 through its two shaft ends; a plurality of trapezoidal cavities with hollow interiors are provided on the top of the operating shaft 22, and each set of symmetrically placed isolation blades 21 passes through a trapezoidal cavity.

[0067] By providing multiple trapezoidal cavities and passing multiple sets of isolation blades through them, the operating shaft's strength is increased. It also prevents the isolation blades 21 from contacting the housing 6 during directional movement. Furthermore, shielding between the multiple isolation blades is enhanced, thereby strengthening the insulation between them. This approach ensures the isolation blades' insulation performance, simplifies the prior art approach of placing the isolation blades within an insulating housing, makes them easier to install, and effectively reduces the overall size of the device.

[0068] Figure 5 This is a structural diagram of the outlet bushing in a column mounted circuit breaker with a built-in rotary isolating switch according to the present invention. Figure 5 As shown, preferably, the outlet bushing 4 includes an outlet conductive core 41, an outlet epoxy resin casting 42, an outlet silicone rubber jacket 43, an outlet high-voltage shielding net 44 and an outlet low-voltage shielding net 45; wherein, the outlet conductive core 41 is provided with a cup-shaped structure on one end close to the shell 6 for accommodating a contact finger connected to one end of the conductive rod 17 on the sealed pole assembly 1.

[0069] The main feature that distinguishes the outlet bushing 7 of the present invention from the prior art is that it has a two-layer shielding net. Specifically, the shielding net includes a high-voltage shielding net and a low-voltage shielding net. Both the high-voltage shielding net and the low-voltage shielding net are cylindrical in structure and are wrapped by epoxy resin structural parts. One end of the high-voltage shielding net is fixed to the conductive core, and the low-voltage shielding net is welded and fixed to the low-voltage shielding net insert, and is fixed to the inside of the outlet bushing 7 by pouring the epoxy resin structural part. In addition, the low-voltage shielding net insert can be partially wrapped by the epoxy resin structural part. In this way, the unwrapped part of the low-voltage shielding net insert can contact the inner side of the flange, thereby realizing the release of the charge in the low-voltage shielding net. Of course, the charge release can also be achieved by connecting the low-voltage shielding net and the shell with a wire.

[0070] It is understandable that, since the double-layer shielding mesh structure enables the bushing to have better performance in isolating electromagnetic radiation and uniform electric field, the allowable spacing distance between the bushings in the present invention is smaller, so that the bushing can be used in smaller circuit breakers.

[0071] In one embodiment of the present invention, the radius of the cylindrical structure of the high-voltage shielding mesh is smaller than the radius of the cylindrical structure of the low-voltage shielding mesh; the high-voltage shielding mesh 16 is partially sleeved inside the low-voltage shielding mesh. The low-voltage shielding mesh can be fixed and connected to the outside of the sleeve by a low-voltage shielding mesh insert. In order to ensure that the low-voltage shielding mesh can provide a uniform and good shielding effect on the conductive core in all directions, it should be ensured that the cylindrical structure of the low-voltage shielding mesh coincides with the axis of the conductive core. The inner end of the cylindrical structure of the high-voltage shielding mesh is sleeved inside the low-voltage shielding mesh; the outer end of the cylindrical structure of the high-voltage shielding mesh exceeds the outer edge of the low-voltage shielding mesh. In this way, the surface electric field strength of the epoxy resin structural component can be reduced.

[0072] In addition, both ends of the low-voltage shielding mesh's cylindrical structure are provided with curling edges facing outward, making the electric field inside the bushing more uniform and reducing the field strength inside the bushing. The inner end of the high-voltage shielding mesh's cylindrical structure is also provided with an arc-shaped closing edge facing inward before being welded to the cup-shaped structure at the end of the conductive core. The outer end of the high-voltage shielding mesh's cylindrical structure is provided with curling edges facing inward, which increases the inner volume of the high-voltage shielding mesh, thereby increasing the distance between the high-voltage and low-voltage shielding meshes, improving the bushing's ability to withstand high voltages, and reducing radiation caused by discharge from the conductive rod to the surface of the epoxy resin structural component.

[0073] Figure 6 This is a structural diagram of the isolating knife static contact support in a column-mounted circuit breaker with a built-in rotary isolating switch according to the present invention. Figure 6 As shown, the static contact support 5 of the isolation knife includes a voltage sensor 51, an incoming conductive rod 52 and an epoxy support 53; wherein, the epoxy support 53 is arranged at the bottom of the shell 6, one end of the incoming conductive rod 52 is horizontally arranged inside the epoxy support 53, and the other end is fixed to the inside of the incoming bushing 4, and is arranged to contact and connect with the isolation knife 21 as a static contact when the isolation knife 21 moves to the closest to the epoxy support 53, and the voltage sensor 51 is encapsulated inside the epoxy support 53 and connected to the incoming conductive rod 52 through a wire.

[0074] It is understandable that the epoxy support can fix the position of the conductive rod 52 inside the housing, so that the conductive rod 52 acts as a static contact to receive the opening and closing signals from the isolation knife 21.

[0075] Figure 7 This is a structural diagram of the incoming bushing in a pole mounted circuit breaker with a built-in rotary isolating switch according to the present invention. Figure 7As shown, the incoming line bushing 7 preferably includes an incoming line conductive core 71, an incoming line epoxy resin casting 72, an incoming line silicone rubber jacket 73, and an incoming line low-voltage shielding mesh 74. The end of the incoming line conductive core 71 near the housing 6 is configured as a cup-shaped structure for accommodating the incoming line conductive rod 52 and its contact fingers on the isolating blade static contact support 5. The structure of the incoming line bushing in the present invention can be similar to that of the outgoing line bushing. However, since the shielding requirements for the incoming line bushing are not as high as those for the outgoing line bushing, it is also possible to provide only one layer of shielding mesh for the incoming line bushing to meet the shielding requirements for the power signal.

[0076] Figure 8 This is a schematic diagram of the structure of the transmission assembly in a column mounted circuit breaker with a built-in rotary isolating switch according to the present invention. Figure 8 As shown, preferably, the transmission assembly 9 includes a spline main shaft 91, a three-phase transmission crank arm 92, a trip spring crank arm 93, a trip spring 94, a spacer 95, a bracket 96, and a pin 97; wherein, the spline main shaft 91 is fixed to the housing 6 through the bracket 96, and the three-phase transmission crank arm 92 and the trip spring crank arm 93 are alternately sleeved on the spline main shaft 91 in sequence; the pin 97 on the three-phase transmission crank arm 92 is used to pass through the insulating pull rod 14 on the sealed pole assembly 1; the pin 97 of the trip spring crank arm 93 passes through the trip spring 94, and the other end of the trip spring is hung on the housing 6.

[0077] Specifically, the opening spring 94 passes through the pin 97 of the opening spring arm 93 and is fixed by a nut 98. As the spline main shaft 91 rotates, the three-phase transmission arm 92 and the opening spring arm 93 fixed on the main shaft 91 will also rotate. When the spring operating mechanism 3 issues a closing command, as shown in FIG. Figure 8 The main shaft 91 described in the circuit breaker will rotate counterclockwise. At the same time, the trip spring arm 93 will stretch the trip spring 94, so that the trip spring 94 stores energy. The insulating pull rod 14 moves downward under the drive of the three-phase transmission arm 92. On the other hand, when the spring operating mechanism 3 issues a trip command, the main shaft 91 will rotate clockwise under the action of the trip spring 94, so that the three-phase transmission arm 92 drives the insulating pull rod 14 to move upward. The beneficial effect of the present invention is that, compared with the prior art, the pole-mounted circuit breaker with a built-in rotary disconnector in the present invention can realize the closing and opening of the vacuum interrupter for rated current and short-circuit current, and the isolation of the disconnector for high voltage through the connection relationship between the sealed pole assembly, the disconnector assembly, the transmission assembly and the spring operating mechanism. The pole-mounted circuit breaker in the present invention has a simple structure, a small size, a small number of components, high reliability, and a long service life.

[0078] The applicant of the present invention has made a detailed explanation and description of the implementation examples of the present invention in conjunction with the drawings in the specification. However, those skilled in the art should understand that the above implementation examples are only preferred implementation plans of the present invention, and the detailed description is only to help readers better understand the spirit of the present invention, and is not a limitation on the scope of protection of the present invention. On the contrary, any improvements or modifications based on the inventive spirit of the present invention should fall within the scope of protection of the present invention.

Claims

1. A pole-mounted circuit breaker with a built-in rotary disconnect switch, characterized in that: The circuit breaker comprises a sealed pole assembly (1), an isolating switch assembly (2), an isolating knife static contact support (5), an outlet bushing (4), an inlet bushing (7), a housing (6), a spring operating mechanism (3) and a transmission assembly (9); wherein, The outlet bushing (4) and the inlet bushing (7) are arranged outside the housing (6); the outlet bushing passes through the housing (6) and is connected to the sealed pole assembly (1) arranged inside the housing (6); the inlet bushing passes through the housing and is connected to the isolating blade static contact support (5) arranged inside the housing; In the sealed pole assembly (1), the epoxy resin casting shell (15) wraps the vacuum interrupter (16) and partially wraps the upper outlet (11) and the lower outlet (12); the flexible connection (13) between the insulating pull rod (14) and the vacuum interrupter (16) can be bent to ensure that the lower outlet is fixed to the epoxy resin casting shell (15) and its relative position relative to the outlet bushing (4) remains unchanged; The isolating knife static contact support (5) fixed to the bottom of the housing includes a voltage sensor (51), an incoming line conductive rod (52) and an epoxy support (53); the epoxy support (53) is fixed to the bottom of the housing (6); one end of the incoming line conductive rod (52) is transversely arranged inside the epoxy support (53), and the other end is fixed inside the incoming line bushing (7), and is arranged to contact and connect with the isolating knife (21) of the isolating switch assembly as a static contact when the isolating knife (21) moves closest to the epoxy support (53); the voltage sensor (51) is encapsulated inside the epoxy support (53) and connected to the incoming line conductive rod (52) through a wire; The spring operating mechanism (3) is connected to the transmission assembly (9) and the isolating switch assembly (2) respectively, and drives the insulating pull rod (14) in the sealed pole assembly (1) to move in a directional manner through the transmission assembly (9), and directly drives the isolating switch assembly (2) to move in a directional manner; The transmission assembly (9) comprises a spline main shaft (91), a three-phase transmission crank arm (92), a trip spring crank arm (93), a trip spring (94), a bracket (96), and a pin (97); wherein, The spline main shaft (91) is fixed to the housing (6) via a bracket (96), and the spline main shaft (91) is alternately sleeved with a three-phase transmission crank arm (92) and a trip spring crank arm (93); The pin (97) on the three-phase transmission crank arm (92) is used to pass through the insulating pull rod (14) on the sealed pole assembly (1); One end of the opening spring is hung on the housing (6); The pin (97) of the opening spring arm (93) passes through the opening spring (94) and is fixed; The insulating pull rod (14) in the sealed pole assembly (1) drives the moving contact of the vacuum interrupter to move during the directional movement, and the isolating switch assembly (2) in the sealed pole assembly (1) drives the isolating knife (21) of the vacuum interrupter to move during the directional movement, thereby realizing the opening and closing operations between the moving contact and the static contact of the vacuum interrupter, and between the isolating knife (21) and the incoming conductive rod (52) on the isolating knife static contact support (5).

2. A pole-mounted circuit breaker with a built-in rotary disconnect switch according to claim 1, characterized in that: The circuit breaker further comprises a current transformer (8), which is sleeved on the portion of the outlet bushing (4) located inside the housing (6) and fixed on the housing (6).

3. The pole-mounted circuit breaker with a built-in rotary disconnect switch according to claim 1, characterized in that: The sealed pole assembly (1) comprises an upper outlet (11), a lower outlet (12), a flexible connection (13), an insulating pull rod (14), an epoxy resin casting shell (15), a vacuum interrupter (16) and a conductive rod (17); wherein, A moving contact and a static contact are provided in the vacuum arc chamber (16), the moving contact passes through the top of the vacuum arc chamber (16), and the static contact passes through the bottom of the vacuum arc chamber (16); the upper outlet (11) is fixedly connected to the static contact through a bolt, and the insulating pull rod (14) passes through a hole at one end of the soft connection (13) and is fixedly connected to the moving contact; the lower outlet (12) is connected to the other end of the soft connection (13) through a bolt to be arranged on the side of the vacuum arc chamber (16) and the insulating pull rod (14), thereby supporting the conductive rod (17) to be connected to the interior of the epoxy resin cast shell (15) including a cavity that does not contact its internal components; the soft connection (13) and the insulating pull rod (14) are located inside the cavity formed when the epoxy resin cast shell (15) is cast, rather than being wrapped by the epoxy resin cast shell (15).

4. A pole-mounted circuit breaker with a built-in rotary disconnect switch according to claim 3, characterized in that: One end of the upper outlet (11) away from the vacuum interrupter (16) is configured to be hollow and flat, so as to achieve hinged connection with one end of the isolating knife (21) in the isolating switch assembly (2); The insulating pull rod (14) in the sealed pole assembly (1) drives the opening and closing operations of the moving contact and the static contact in the vacuum interrupter (16) based on directional movement.

5. The pole-mounted circuit breaker with a built-in rotary disconnect switch according to claim 1, characterized in that: The top end of the insulating pull rod (14) is located outside the epoxy resin casting shell (15).

6. The pole-mounted circuit breaker with a built-in rotary disconnect switch according to claim 1, characterized in that: The isolating switch assembly (2) comprises a plurality of symmetrically arranged isolating blades (21), operating shafts (22), limit blocks (23), equalizing bolts (24) and compression springs (25); wherein, The plurality of isolation blades (21) are fixed on the operating shaft (22) to achieve relative position fixation with the housing (6); Each group of the isolation knives (21) includes two symmetrically placed isolation knives (21), and the symmetrically placed isolation knives (21) are symmetrically grouped by means of pressure-equalizing bolts (24) and compression springs (25) arranged at both ends. The pressure-equalizing bolt (24) at the head end passes through the symmetrically placed isolation knives (21) and the limit block (23) placed between the isolation knives (21); and the pressure-equalizing bolt (24) at the tail end passes through the symmetrically placed isolation knives (21) and the end of the upper outlet line (11) between the isolation knives (21).

7. The pole-mounted circuit breaker with a built-in rotary disconnect switch according to claim 6, characterized in that: The operating shaft (22) is clamped on the housing (6) via two shaft ends. The top of the operating shaft (22) is provided with a plurality of trapezoidal cavities with hollow interiors, and each group of symmetrically placed isolation knives (21) passes through a trapezoidal cavity.

8. The pole-mounted circuit breaker with a built-in rotary disconnect switch according to claim 1, characterized in that: The outlet bushing (4) comprises an outlet conductive core (41), an outlet epoxy resin casting (42), an outlet silicone rubber jacket (43), an outlet high-voltage shielding net (44) and an outlet low-voltage shielding net (45); One cylindrical end of the outgoing line high voltage shielding net (44) is fixed on the outgoing line conductive core; The outgoing line low-voltage shielding net (45) is fixed to the outgoing line low-voltage shielding net insert by welding, and is fixed to the inside of the outgoing line casing by pouring the outgoing line epoxy resin pouring piece (42); The unwrapped part of the outlet low-voltage shielding mesh insert contacts the inner side of the flange of the outlet bushing; The inner end of the cylindrical structure of the outgoing high-voltage shielding net (44) is sleeved inside the outgoing low-voltage shielding net (45); the outer end of the cylindrical structure of the outgoing high-voltage shielding net (44) is arranged beyond the outer edge of the outgoing low-voltage shielding net (45); The end of the outgoing conductive core (41) close to the housing (6) is provided with a cup-shaped structure for accommodating a contact finger on the sealed pole assembly (1) connected to one end of the conductive rod (17).

9. The pole-mounted circuit breaker with a built-in rotary disconnect switch according to claim 1, characterized in that: The incoming line bushing comprises an incoming line conductive core (71), an incoming line epoxy resin casting (72), an incoming line silicone rubber jacket (73), and an incoming line low-voltage shielding net (74); The incoming line low-voltage shielding net (74) is fixed to the low-voltage shielding net insert by welding, and is fixed to the inside of the incoming line casing (7) by pouring the incoming line epoxy resin casting (72); The unwrapped portion of the incoming low-voltage shielding mesh insert contacts the inner side of the flange of the incoming bushing (7); The end of the incoming conductive core (71) close to the housing (6) is configured as a cup-shaped structure for accommodating the incoming conductive rod (52) and its contact fingers on the isolation blade static contact support (5).

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