Built-in disconnecting switch type pole-mounted circuit breaker

Abstract

The invention discloses a pole-mounted circuit breaker with a built-in isolating switch, and relates to the technical field of pole-mounted circuit breakers. The pole-mounted circuit breaker with the built-in isolating switch comprises a box body, the box body is internally provided with left and right independent insulating cavities, and the left and right sides of the box body are respectively provided with a power supply access end and a load leading-out end; the isolating switch assembly is arranged in the insulating cavity on the left side and comprises moving contact knives which are arranged in a left-right matched mode, when the isolating switch assembly is switched on, the moving contact knives on the left side and the right side make contact with each other and are in conductive connection, and when the isolating switch assembly is switched off, the moving contact knives on the left side and the right side can rotate anticlockwise at the same time and are rapidly separated from each other to form an obvious electrical isolating gap. By arranging the two movable contact knife structures which can synchronously rotate anticlockwise in a mode of being far away from each other in the opening process, the separation distance between the two movable contact knives can be multiplied within the same time, the establishment process of an electric gap is accelerated, and therefore the opening speed and the isolation efficiency are remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pole-mounted circuit breakers, in particular to a pole-mounted circuit breaker with a built-in isolating switch. Background Art

[0002] The pole-mounted circuit breaker with an internal disconnector is an outdoor power distribution device that integrates a vacuum circuit breaker and disconnector switch in a sealed enclosure. It is primarily used for the protection and control of distribution network lines. Its core design goal is to address the corrosion and flashover issues associated with traditional external disconnectors through internal isolation, while also achieving mechanical linkage between the circuit breaker and disconnector, meeting functional requirements such as rapid reclosing.

[0003] However, the existing built-in isolating switch type column mounted circuit breaker still has the following problems: 1. The traditional disconnector assembly's opening and closing structure usually uses a single moving contact blade rotating relative to a fixed static contact to connect and disconnect the circuit. This structure has many limitations in practical applications. First, during the rotation of the moving contact blade, the contact point between it and the static contact blade changes unevenly, resulting in a slow increase in the electrical gap between the two in the initial opening phase and the presence of "local contact" in the motion trajectory. This unstable distance change not only prolongs the arc duration, but also easily causes local high-temperature ablation, affecting the life of the contact blade.

[0004] 2. In addition, if the traditional circuit breaker assembly separation structure relies solely on a single-directional pushing element to apply separation force to the moving contact, during actual operation, the electromagnetic force may easily cause the contact surface between the moving contact and the static contact to fail to achieve uniform and synchronous separation, resulting in the current channel not being completely cut off, forming a residual conductive path, thereby affecting the overall disconnection effect of the circuit and may even cause abnormal arcing or partial discharge. At the same time, this asynchronous and incomplete separation process will also make it difficult for the arc extinguishing device to suppress the arc in a timely and effective manner, reducing the arc extinguishing efficiency. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a pole-mounted circuit breaker with a built-in isolating switch, which solves the problems raised in the background art.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a pole-mounted circuit breaker with a built-in disconnector, comprising: a housing, wherein left and right independent insulating chambers are provided within the housing, and power supply input terminals and load output terminals are provided on the left and right sides of the housing, respectively; an isolating switch assembly, wherein the isolating switch assembly is disposed within the left insulating chamber, and comprises left and right movable contact blades arranged in cooperation with each other. When the switch is closed, the left and right movable contact blades contact each other and are electrically connected. When the switch is opened, the left and right movable contact blades can simultaneously rotate counterclockwise, quickly separate from each other, and form a clear electrical isolation gap; a circuit breaker assembly, wherein the circuit breaker assembly is disposed within the right insulating chamber, and comprises a movable contact and a stationary contact. The movable contact can move left and right along the circuit breaker body. The stationary contact is disposed within the circuit breaker body and cooperates with the movable contact to connect and disconnect the circuit; and an extrusion plate, wherein the extrusion plate is arranged up and down relative to the movable contact and slides up and down with the circuit breaker body. The upper and lower extrusion plates can move toward each other to isolate the movable contact from the stationary contact, thereby achieving safe separation of the movable contact and the stationary contact.

[0007] Furthermore, the power input end and the load output end are respectively provided with an input pole and an output pole, the movable contact knife located on the left is hinged to the right end of the input pole, and the movable contact knife located on the right is hinged to the left end of a conductive column; push rods are installed on the upper ends of the hinge points of the left and right movable contact knives, and a push slide groove is provided on the upper ends of the push rods. The left and right push rods relative to each other are connected by a cross bar, and the left and right ends of the cross bar are slidably matched with the corresponding push slide grooves through pin shafts, and a vertical rod is installed on the upper end of the cross bar.

[0008] Furthermore, two mounting grooves distributed front and back are opened on the left side of the extrusion plate, a wedge-shaped push plate is provided in the mounting groove for sliding up and down, a mounting rod is installed in the mounting groove for sliding up and down with the wedge-shaped push plate, a support spring mounted on the mounting rod is connected between the mounting groove and the wedge-shaped push plate, and a support plate is connected between the front and rear wedge-shaped push plates.

[0009] Furthermore, a control rod that slides up and down with the circuit breaker body is installed on the side of the support plate away from the extrusion plate, and the end of the control rod away from the support rod is inclined to the left, and a triangular block is provided on the right side of the control rod. The inclined surface of the triangular block slides with the inclined surface of the control rod, and a movable frame is connected between the upper and lower opposite triangular blocks. The lower end of the movable frame slides left and right with the box body, and an elastic telescopic column fixedly connected to the box body is provided on the right side of the triangular block located below.

[0010] Furthermore, the static contact is installed at the left end of the output pole, the circuit breaker body is fixedly sleeved on the output pole, the left end of the moving contact is installed with a conductive column 2, a conductive sleeve fixedly connected to the box body is provided between the left and right insulating chambers, the left end of the conductive column 2 is installed with a conductive disk that slides left and right with the conductive sleeve, the left end of the conductive disk is installed with a conductive rod that slides with the conductive sleeve, a connecting spring sleeved on the outside of the conductive rod is connected between the conductive disk and the left inner wall of the conductive sleeve, and the left end of the conductive rod slides left and right with the conductive column 1.

[0011] Furthermore, a protrusion that is plugged into and matched with the static contact is provided at the right end of the moving contact, and a slot that is matched with the protrusion is provided on one side of the extrusion plate close to the moving contact.

[0012] Furthermore, a slide bar is installed on the right side of the vertical rod and the triangular block respectively, a cam is provided on the right side of the slide bar, a side groove is opened on the outside of the cam for sliding cooperation with the slide bar, a roller is rotatably installed on the outside of the slide bar for rolling contact with the side groove, and the front and rear cams relative to each other are installed on the same rotating shaft.

[0013] Furthermore, a fixed plate rotatably connected to the rotating shaft is installed in the box body, a ratchet is installed after the rotating shaft passes through the fixed plate, an extension plate fixedly connected to the fixed plate is provided on the inner side of the ratchet, a sliding block is installed on the extension plate for sliding back and forth, and the upper end of the sliding block is hinged with a ratchet tooth that cooperates with the ratchet through a torsion spring shaft.

[0014] Furthermore, a control plate is installed on the front side of the sliding block, a sliding column is installed at the lower end of the control plate, and a spiral groove is provided on the outer side of the rotating shaft to slide with the sliding column; a rotating column is rotatably installed at the front end of the ratchet, a fixing bar is installed on the outer side of the rotating column, and a semi-annular groove is provided on the ratchet to rotate with the fixing bar.

[0015] Furthermore, a pulley is installed at the front end of the rotating column, and the left and right opposite pulleys are connected through belt transmission. The front end of the pulley on the left is installed with a control shaft connected to the box body for rotation.

[0016] The present invention has the following beneficial effects: (1) The built-in isolating switch type pole mounted circuit breaker is provided with two movable contact blade structures that can rotate counterclockwise synchronously in a manner away from each other during the opening process. Compared with the traditional opening structure that relies on the movement of a single movable contact blade relative to a fixed static contact blade, this design can double the separation distance between the two movable contact blades in the same time, thereby significantly improving the opening speed and isolation efficiency. The structural setting of the double movable contact blades moving in opposite directions not only speeds up the process of establishing the electrical gap, but also effectively reduces the arc duration during the opening process, thereby improving the safety and reliability of the operation. In addition, this structural form helps to reduce the loss of the contact blade material, extend the service life of the equipment, and still ensure good fracture insulation performance under high voltage or high current conditions, further ensuring the stability of the system operation.

[0017] (2) The built-in isolating switch type pole mounted circuit breaker applies force to the moving contact from both the upper and lower directions by setting an extrusion plate, and inserts it between the moving contact and the static contact to push it away from the static contact, so that the moving contact is subjected to balanced force on the vertical plane, thereby avoiding uneven force on the static contact or unstable phenomena such as deflection and shaking caused by applying a pushing force from only one side. It not only improves the response speed and reliability of the opening action, but also ensures that the contact surface between the moving contact and the static contact is quickly separated and evenly pulled apart, forming a uniform and stable electrical gap, thereby improving the arc extinguishing efficiency and enhancing the circuit breaker's breaking capacity under high current or high voltage conditions.

[0018] (3) The built-in isolating switch type pole-mounted circuit breaker forces the moving contact to move further away from the static contact by setting a wedge-shaped push plate, thereby increasing the safety distance between the moving contact and the static contact on the original basis. This structural design not only realizes the multi-stage push separation mechanism between the moving contact and the static contact, improves the fracture stability and arc extinguishing efficiency during the opening process, but also effectively prevents the disconnection failure problem caused by the rebound of the moving contact or the reignition of the arc.

[0019] (4) The built-in disconnector-type pole-mounted circuit breaker adopts a dual-cam drive structure. By setting left and right cams with different motion states, the action sequence of the disconnector assembly and the circuit breaker assembly during the opening and closing process is controlled respectively, so as to realize the orderly linkage operation between the two. The dual-cam structure design can not only effectively avoid the problems of asynchronous action, stuck or response delay caused by mechanical wear, assembly error and other factors in the traditional rocker transmission mechanism, but also can apply a controllable drive path to the key components during the opening and closing process. In addition, the dual-cam structure has good motion transition characteristics during the action conversion process, which can provide a buffering effect at the moment when the moving contact blade contacts or separates from the static contact, reduce the impact force, and improve the stability and reliability of the overall operation.

[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 Schematic diagram of the half-section plane structure; Figure 3 Schematic diagram of the cross-sectional structure of the box body in the present invention; Figure 4 It is a structural schematic diagram of the isolating switch assembly, the conductive sleeve and the circuit breaker assembly in the present invention; Figure 5Schematic diagram of the cross-sectional structure of the isolating switch assembly of the present invention; Figure 6 For the present invention Figure 5 A magnified schematic diagram of area A in the middle; Figure 7 Schematic diagram of the cross-sectional structure of the conductive sleeve in the present invention; Figure 8 This is a schematic cross-sectional view of the circuit breaker body of the present invention; Figure 9 It is a partial cross-sectional structural diagram of the circuit breaker assembly of the present invention; Figure 10 Schematic diagram of the cross-sectional structure of the movable contact and the static contact in the present invention; Figure 11 Schematic diagram of the structure of the belt, pulley and rotating column in the present invention; Figure 12 Schematic diagram of the structure of the ratchet wheel and ratchet teeth in the present invention; Figure 13 Schematic diagram of the structure of the fixing bar and the semi-annular groove in the present invention.

[0022] In the figure, 1. box; 2. insulating chamber; 21. zero-sequence transformer; 211. input pole; 212. output pole; 213. moving contact blade; 214. conductive pole 1; 215. push rod; 216. push slide; 217. horizontal bar; 218. vertical bar; 22. current transformer; 221. moving contact; 222. static contact; 223. conductive pole 2; 224. conductive sleeve; 225. conductive disk; 226. conductive rod; 227. connecting spring; 228. extrusion plate; 229. slot; 230. mounting slot; 231. wedge-shaped push plate; 232. mounting rod; 233 , support spring; 234, support plate; 235, control rod; 236, triangular block; 237, movable frame; 238, elastic telescopic column; 239, slide bar; 240, cam; 241, side groove; 242, roller; 243, rotating shaft; 244, fixed plate; 245, ratchet; 246, extension plate; 247, sliding block; 248, ratchet; 249, control plate; 250, slide column; 251, spiral groove; 252, rotating column; 253, fixed bar; 254, semi-annular groove; 255, pulley; 256, belt; 3, gas maintenance device; 31, inflation pipe. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] The following is based on Figures 1-13 A pole-mounted circuit breaker with a built-in disconnector provided in an embodiment of the present invention is described.

[0026] See also Figures 1-4 The built-in isolating switch type pole mounted circuit breaker includes a box body 1, which adopts an integral sealed structure and is filled with normal pressure sulfur hexafluoride gas or other high-performance gas medium to build a stable electrical insulation and arc extinguishing environment. The box body 1 is provided with left and right independent insulating chambers 2, and the chambers are respectively equipped with a zero-sequence transformer 21 and a current transformer 22. Among them, the zero-sequence transformer 21 is used to detect the zero-sequence current to achieve ground fault protection, and the current transformer 22 is used to convert the large current in the main circuit into a standard small current signal in proportion. For line monitoring and protection control; the insulating chamber 2 is made of high-strength composite insulating material, which is used to enhance the insulation capacity between phases and the ground, and provide physical protection for the internal conductive components. The left and right sides of the box body 1 are respectively provided with a power input terminal and a load lead-out terminal, wherein the power input terminal is used to connect the input line, and the load lead-out terminal is used to output to the downstream power equipment. The two are controllably connected through a conductive path set in the insulating chamber 2. The power input terminal and the load lead-out terminal are respectively provided with an input pole 211 and an output pole 212.

[0027] See also Figure 3 and Figure 4 It should be noted that in order to ensure that the concentration of sulfur hexafluoride gas or other high-performance insulating gas filled in the box 1 and the left and right insulating chambers 2 therein is stable and evenly distributed, so as to continuously maintain good insulation performance and arc extinguishing capability, a plurality of gas filling pipes 31 are provided in the box 1. The gas filling pipes 31 are reasonably arranged along the internal space of the box 1 to form a multi-point gas supply structure, which helps to quickly and evenly fill the entire box 1 and each insulating chamber 2 with gas, thereby avoiding problems such as insulation failure or arc abnormality caused by local gas thinning. A gas maintenance device 3 in the prior art is also installed in the box 1. The device is connected to the gas filling pipes 31 and has gas pressure monitoring, replenishment and circulation purification functions. It can detect changes in gas concentration in the box 1 in real time and automatically start the gas replenishment program when the gas concentration is lower than the set threshold to maintain the stability and reliability of the gas environment in the box 1.

[0028] See also Figure 2 、 Figure 4 and Figure 5 , wherein, an isolating switch assembly is provided in the insulating chamber 2 on the left, and the isolating switch assembly can form an obvious isolation point when the circuit is disconnected, and is used to isolate the power supply, including left and right movable contact blades 213 arranged in coordination, the movable contact blade 213 on the left is hinged to the right end of the input pole 211 through a torsion spring rod, and the movable contact blade 213 on the right is hinged to the left end of the conductive column 214 through another torsion spring rod. The torsion spring rod causes the left and right movable contact blades 213 to always have a tendency to rotate inward and approach each other, thereby enhancing the contact pressure between the movable contact blades 213 when in the closed position, improving In order to improve the conductivity and connection reliability, the two form a complete conductive path when in the closed position. An insulating bracket for supporting the left and right movable contact blades 213 is also installed in the box 1; when the closing operation is performed, the left and right movable contact blades 213 are close to each other and in close contact, forming a low-resistance conductive path to ensure stable current transmission. In the opening process, the left and right movable contact blades 213 need to overcome the elastic force of the torsion spring rod and synchronously rotate counterclockwise around their respective hinge points, quickly disengage from contact and create a sufficient air gap, thereby forming an obvious and visible electrical isolation fracture in the main circuit.

[0029] During the above process, the two moving contact blades 213 rotate synchronously counterclockwise in a manner of moving away from each other during the opening process. Compared with the traditional opening structure that only relies on the movement of a single moving contact blade 213 relative to a fixed static contact blade, this design can multiply the separation distance between the two moving contact blades 213 within the same time, thereby significantly improving the opening speed and isolation efficiency. Through the structural setting of the opposite movement of the double moving contact blades 213, not only the process of establishing the electrical gap is accelerated, but also the arc duration during the opening process is effectively reduced, thereby improving the safety and reliability of the operation. In addition, this structural form helps to reduce the loss of contact blade material, extend the service life of the equipment, and still ensure good fracture insulation performance under high voltage or high current conditions, further ensuring the stability of the system operation.

[0030] See also Figure 2 and Figures 8-10In addition, a circuit breaker assembly is provided in the insulating chamber 2 on the right. This assembly serves as the core execution unit of circuit control and protection. It is suitable for reliably connecting or disconnecting the current under normal operating conditions and fault conditions, thereby realizing effective protection and orderly control of the power system. It includes a moving contact 221 and a static contact 222, wherein the moving contact 221 can move left and right along the circuit breaker body, and the circuit breaker body is fixedly mounted on the output pole 212. The static contact 222 is arranged in the circuit breaker body and connected to the output pole 212, and is used to provide a stable flow path for the current in the closed state. When the moving contact 221 moves toward and contacts the static contact 222, a low-resistance conductive path is formed between the two to realize circuit closure; and during the opening process, the moving contact 221 quickly separates from the static contact 222, cutting off the current flow, thereby realizing effective circuit disconnection.

[0031] See also Figure 2 、 Figure 4 、 Figure 5 and Figure 7-Figure 9 To achieve electrical connectivity between the disconnector assembly and the circuit breaker assembly and ensure that both maintain a stable current transmission path under different operating conditions, a second conductive post 223 is fixedly mounted on the left end of the moving contact 221. A conductive sleeve 224, fixedly connected to the housing 1, is provided between the left and right insulating chambers 2. A conductive disc 225, which slides left and right with the conductive sleeve 224, is mounted on the left end of the second conductive post 223 to achieve dynamic connection of the conductive path. A conductive rod 226, which slides left and right with the conductive sleeve 224, is mounted on the left end of the conductive disc 225. The left end of the conductive rod 226 forms a sliding connection with the first conductive post 214 on its right side, thereby establishing a complete conductive circuit from the circuit breaker assembly to the disconnector assembly. A connecting spring 227, which is sleeved on the outside of the conductive rod 226, is connected between the conductive disc 225 and the left inner wall of the conductive sleeve 224. The connecting spring 227 serves as a reset and pressure-maintaining element, providing a constant elastic support force during the opening and closing process to ensure good contact between the conductive components.

[0032] When the closing operation is performed, the moving contact 221 moves to the right and fits tightly with the static contact 222 to form a main circuit path; at the same time, the conductive column 223 pushes the conductive disk 225 and the conductive rod 226 to the right, causing them to move synchronously to the right in the conductive sleeve 224. At this time, the connecting spring 227 is in a naturally stretched state and does not affect the establishment of the conductive path; in the opening process, the moving contact 221 moves to the left and separates from the static contact 222, and the conductive column 223 moves to the left together with the moving contact 221, driving the conductive disk 225 and the conductive rod 226 to move synchronously to the left, compressing the connecting spring 227, causing it to store a certain amount of reset potential energy; although the length of the conductive path changes, the conductive rod 226 always maintains a sliding fit with the conductive column 1 214, ensuring the continuity and stability of the circuit during the dynamic process.

[0033] See also Figure 2 、 Figure 4 and Figure 5 In order to realize the synchronous rotation of the left and right movable contact knives 213 during the closing and opening processes, and ensure that they have good coordination and stability when connecting or disconnecting the circuit, a push rod 215 is installed on the upper end of the hinge point of the left and right movable contact knives 213, which is used to effectively transmit the external operating force to the movable contact knife 213, prompting it to rotate around the hinge axis. A push slide 216 is provided on the upper end of the push rod 215, and the push slide 216 extends along the length direction of the push rod 215. The left and right opposite push rods 215 are connected by a cross bar 217. The left and right ends of the cross bar 217 are slidably matched with the corresponding push slide 216 through a pin shaft. At the same time, a vertical rod 218 is installed on the upper end of the cross bar 217. The vertical rod 218 serves as a drive input end and can reciprocate in the left and right directions. When the vertical rod 218 moves to the right, the left and right push rods 215 are driven to move synchronously to the right through the horizontal rod 217. At this time, the lower end of the push rod 215 pushes the movable contact knife 213 to rotate clockwise around the hinge point, so that the left and right movable contact knives 213 approach each other and finally contact and engage, completing the conduction connection of the circuit; conversely, when the vertical rod 218 moves to the left, it drives the horizontal rod 217 and the push rod 215 to move left as a whole, and the lower end of the push rod 215 drives the left and right movable contact knives 213 to rotate synchronously counterclockwise, realizing the rapid separation of the two movable contact knives 213, thereby disconnecting the circuit and forming a clear electrical isolation gap, thereby realizing the synchronous motion control of the left and right movable contact knives 213 during the closing and opening processes, and the operating efficiency and installation performance of the isolating switch assembly are improved.

[0034] See also Figures 8-10 In order to achieve reliable closing and safe opening operations between the moving contact 221 and the static contact 222, two extrusion plates 228 are arranged symmetrically about the moving contact 221. The extrusion plates 228 are semicircular in shape and made of insulating material. The extrusion plates 228 slide up and down with the circuit breaker body. The upper and lower extrusion plates 228 can move toward each other at the same time, that is, they move toward the direction of the moving contact 221 at the same time and apply a lateral extrusion force to the moving contact 221, forcing it to break away from the contact state with the static contact 222, thereby achieving fast and reliable circuit disconnection. A protrusion is provided on the right end of the moving contact 221 for plugging and mating with the static contact 222. The protrusion is inserted into the corresponding socket of the static contact 222 in the closed state, forming an enhanced plug-in structure, which not only improves the conductive area and contact stability between the moving contact 221 and the static contact 222, but also effectively prevents accidental tripping caused by vibration or short-term overcurrent.

[0035] During the closing process, the squeezing plates 228 on the upper and lower sides are in the initial position away from the moving contact 221. At this time, the connecting spring 227 is in a naturally extended state. Under the action of its elastic force, the moving contact 221 automatically moves to the right and fits tightly with the static contact 222 to complete the circuit conduction; during the opening operation, the upper and lower squeezing plates 228 move toward each other, and the side close to the moving contact 221 is provided with a card groove 229 that matches the protrusion of the moving contact 221. When the squeezing plate 228 continues to approach the moving contact 221, the protrusion is embedded in the card groove 229 and is guided to separate from the static contact 222, and the moving contact 221 is squeezed by the squeezing action. The static contact 222 is forced to be pushed away, thereby achieving rapid separation and electrical disconnection between the two; by applying forces in the upper and lower directions at the same time, the moving contact 221 is subjected to balanced force on the vertical plane, thereby avoiding uneven force on the static contact 222 or unstable phenomena such as deflection and shaking caused by applying pushing force from only one side. This not only improves the response speed and reliability of the opening action, but also ensures that the contact surface between the moving contact 221 and the static contact 222 is quickly separated and evenly pulled apart, forming a uniform and stable electrical gap, thereby improving the arc extinguishing efficiency and enhancing the circuit breaker's breaking capacity under high current or high voltage conditions.

[0036] See also Figure 9 and Figure 10 In order to further increase the separation distance between the moving contact 221 and the static contact 222 during the opening process and ensure that a sufficiently large electrical gap is formed between the two to meet the safety disconnection requirements under high voltage and high current conditions, two mounting grooves 230 distributed front and back are opened on the left side of the extrusion plate 228. A wedge-shaped push plate 231 is provided in the mounting groove 230 for sliding up and down. The inclined surface of the wedge-shaped push plate 231 faces the direction of the moving contact 221, which is used to apply additional pushing force to the moving contact 221 in subsequent actions. A mounting rod 232 is installed in 30 and is slidably matched with the wedge-shaped push plate 231 to guide the movement trajectory of the wedge-shaped push plate 231. At the same time, a support spring 233 is connected between the mounting groove 230 and the wedge-shaped push plate 231 and is sleeved on the mounting rod 232. The support spring 233 has a large elastic coefficient and is used to provide initial support force for the wedge-shaped push plate 231 and keep it in a natural position at the initial stage of opening the gate. A support plate 234 is connected between the front and rear wedge-shaped push plates 231 to ensure that the front and rear wedge-shaped push plates 231 move synchronously.

[0037] When the upper and lower extrusion plates 228 move toward each other and gradually approach each other until they contact each other, the support spring 233 is still in an uncompressed state, and the entire structure is in the initial stage at this time; and when the force continues to be applied to the support plate 234, the wedge-shaped push plate 231 will move along the mounting groove 230 toward the moving contact 221 under the guidance of the mounting rod 232, and the support spring 233 will be compressed accordingly to store reset potential energy; in this process, the inclined surface of the wedge-shaped push plate 231 contacts the moving contact 221 and applies lateral thrust, forcing the moving contact 221 to move further away from the static contact 222, thereby increasing the safety distance between the moving contact 221 and the static contact 222 again on the original basis. This structural design not only realizes a multi-stage push separation mechanism between the moving contact 221 and the static contact 222, improves the fracture stability and arc extinguishing efficiency during the opening process, but also effectively prevents the disconnection failure problem caused by the rebound of the moving contact 221 or the reignition of the arc.

[0038] See also Figure 4 、 Figure 5 、 Figure 8 and Figure 9 In order to realize the synchronous relative movement of the upper and lower support rods during the opening or closing process, and to ensure the coordination of the operating action and the stability of the structure, a control rod 235 that slides up and down with the circuit breaker body is installed on the side of the support plate 234 away from the extrusion plate 228. The end of the control rod 235 away from the support plate 234 is tilted to the left as a whole, forming an oblique driving structure. A triangular block 236 is provided on the right side of the control rod 235. A slider that slides with the inclined surface of the control rod 235 is installed on the inclined surface of the triangular block 236, so that when the triangular block 236 moves left and right, the control rod 235 can be driven to move in the up and down direction through the contact between the slider and the control rod 235. Specifically, when the triangular block 236 moves to the left, its inclined surface squeezes the inclined surface of the end of the control rod 235, so that the control rod 235 drives the support plate 234 to move When the upper triangle block 236 is moved to the right, the control rod 235 is reset and the support plate 234 is driven to return to its initial position. In order to ensure the synchronization of the upper and lower triangle blocks 236, a movable frame 237 is connected between the upper and lower relative triangle blocks 236. The lower end of the movable frame 237 slides left and right with the box body 1 to enhance the running stability of the overall structure during the movement. An elastic telescopic column 238 fixedly connected to the box body 1 is provided on the right side of the lower triangle block 236 for providing auxiliary thrust to the lower triangle block 236 during operation. When the upper triangle block 236 is subjected to an external driving force and has a tendency to deviate, the support of the elastic telescopic column 238 can effectively prevent the overall structure from becoming unstable, stuck or moving asynchronously due to uneven force.

[0039] See also Figure 4-Figure 6 and Figure 8 In order to achieve the synchronous left and right movement of the vertical rod 218 and the triangular block 236 during operation, and to ensure that the circuit breaker assembly and the disconnector assembly have a clear action sequence during the closing and opening processes, that is, when closing, the disconnector assembly is closed first, and the circuit breaker assembly is connected subsequently; when opening, the circuit breaker assembly is disconnected first, and the disconnector assembly is separated subsequently, a slide bar 239 is installed on the right side of the vertical rod 218 and the triangular block 236 respectively, and a cam 240 is provided on the right side of the slide bar 239. A side groove 241 is provided on the outer side of the cam 240 to slide with the slide bar 239. When the cam 240 rotates, it can push the corresponding vertical rod 218 or triangular block 236 to move through the cooperation with the slide bar 239. In addition, a roller 242 is rotatably installed on the outer side of the slide bar 239 and is in rolling contact with the side groove 241. The roller 242 is conducive to reducing the friction between the slide bar 239 and the cam 240, thereby reducing the increase in operating force or the phenomenon of action jamming caused by excessive friction.

[0040] In addition, the cams 240 on the left and right sides can rotate synchronously, but the working states of the cams 240 on the left and right sides are different: during the opening process, when the cams 240 rotate counterclockwise as a whole, the raised edge of the right cam 240 first contacts the slide bar 239 on the triangular block 236 and applies a thrust, thereby pushing the triangular block 236 to the left, thereby controlling the moving contact 221 in the circuit breaker assembly to move away from the static contact 222; at this time, the left cam 240 still maintains sliding contact with the slide bar 239 on the vertical rod 218 with its smooth surface, No squeezing effect is produced on the vertical rod 218, so the isolating switch assembly has not yet operated. As the cam 240 continues to rotate counterclockwise, the right cam 240 continues to push the triangular block 236 to move left, while the left cam 240 gradually enters the contact stage between its protruding part and the slide 239 of the vertical rod 218, and begins to apply thrust to the vertical rod 218, causing the vertical rod 218 to move left, driving the isolating switch assembly to complete the opening action, thereby realizing an orderly opening process in which the circuit breaker assembly is disconnected before the isolating switch assembly, and the isolating switch assembly is disconnected subsequently.

[0041] During the closing process, the cam 240 rotates clockwise to reset. At this time, the left cam 240 first returns to the non-extrusion state between its smooth surface and the sliding bar 239 on the vertical rod 218, so that the vertical rod 218 moves right first, driving the disconnector assembly to complete the closing action; while the right cam 240 is still in the state of contact between the raised portion and the sliding bar 239 on the triangular block 236, and continues to apply pressure to the triangular block 236. After the cam 240 rotates further, the triangular block 236 releases the pressure and gradually resets after the sliding bar 239 and cam 240 are out of contact, thereby To achieve the subsequent closure of the circuit breaker assembly. In addition, during the resetting process, the contact between the cam 240 and the triangular block 236 also has a certain buffering effect, which can slow down the resetting speed of the triangular block 236 and prevent mechanical damage or unstable movement due to excessive impact, thereby improving the reliability of the overall structure. This structure realizes the orderly linkage of the circuit breaker assembly and the disconnector assembly during the closing and opening processes by setting a double-sided cam 240 system with different action timings, which not only improves the safety and controllability of the operation, but also effectively avoids the risk of misoperation.

[0042] See also Figure 3 、 Figure 4 and Figure 11-13 The cams 240 are arranged on the same shaft 243 so as to be able to rotate synchronously with each other and to maintain the same state after rotating to the specified position, thereby preventing the cams 240 from rotating incorrectly due to external force or vibration.

[0043] During the opening operation, when the shaft 243 rotates counterclockwise, the cam 240 rotates synchronously therewith. At this time, the ratchet 248, pushed by the tooth surface of the ratchet wheel 245, overcomes the force of the torsion spring and temporarily disengages, allowing the shaft 243 to rotate freely, thereby realizing orderly opening control between the circuit breaker assembly and the disconnector assembly; when the cam 240 rotates to the set angle, the ratchet 248 resets and engages with the ratchet wheel 245, preventing the shaft 243 from continuing to rotate, thereby locking the cam 240 at the current angle position, ensuring that the circuit breaker assembly and the disconnector assembly are maintained. Maintain a stable opening state to avoid abnormal circuit conduction due to rebound or offset; when performing the closing and resetting operation, it is necessary to first move the sliding block 247 forward along the extension plate 246 to disengage the ratchet 248 from the meshing state of the ratchet 245 and release the limit on the rotating shaft 243; at this time, the rotating shaft 243 can drive the cam 240 and the ratchet 245 to rotate clockwise and reset, completing the restoration of the overall structure. After the reset is completed, release the sliding block 247, and the ratchet 248 automatically engages with the ratchet 245 again under the action of the torsion spring, preparing for the next opening operation.

[0044] See also Figure 11-13 In order to realize the forward and backward movement of the sliding block 247 on the extension plate 246 and control the engagement and disengagement state between the ratchet teeth 248 and the ratchet wheel 245, a control plate 249 is installed on the front side of the sliding block 247, and a sliding post 250 is installed at the lower end of the control plate 249. A spiral groove 251 is provided on the outer side of the rotating shaft 243 to slide with the sliding post 250. When the rotating shaft 243 rotates, the sliding post 250 moves synchronously with it under the guidance of the spiral groove 251, and the spiral structure of the spiral groove 251 produces axial displacement, thereby driving the control plate 249 and its connected sliding block 247 to make linear motion in the direction of the extension plate 246. In addition, a rotating post 252 is rotatably installed at the front end of the ratchet wheel 245, and a fixing bar 253 is installed on the outer side of the rotating post 252. A semi-annular groove 254 is provided for rotationally cooperating with the fixing bar 253, so that the fixing bar 253 can rotate freely relative to the ratchet 245 within a certain range. When the ratchet 248 disengages from the ratchet 245, the fixing bar 253 can be driven to rotate a certain angle (for example, half a circle) in the semi-annular groove 254 through the rotating column 252. At this time, the rotating column 252 only drives the fixing bar 253 to rotate without affecting the relative position of the ratchet 245 and the rotating shaft 243, thereby avoiding the accidental triggering of the locking function of the ratchet 245. After the fixing bar 253 rotates to the limit end abutting the semi-annular groove 254, continuing to apply rotational force will drive the ratchet 245 to rotate as a whole through the fixing bar 253, thereby driving the rotating shaft 243 to rotate synchronously, thereby realizing the reset and closing operation of the disconnector assembly and the circuit breaker assembly.

[0045] In addition, a pulley 255 is installed at the front end of the rotating column 252, and the left and right opposite pulleys 255 are connected by belt 256. The engagement transmission between the belt 256 and the left and right pulleys 255 is used to ensure that the left and right rotating columns 252 maintain high synchronization during the rotation process, thereby driving the left and right rotating shafts 243 and cam 240 components connected thereto to rotate synchronously, so as to accurately control the closing and opening operations of the circuit breaker assembly and the disconnector assembly. Among them, the front end of the pulley 255 on the left is installed with a control shaft rotatably connected to the box body 1. After extending out of the box body 1, the control shaft can be connected to an external operating component (such as a manual control handle or an electric drive device). When the operating handle is manually rotated or the electric drive device is started, power is input through the control shaft and the rotational motion is transmitted to the rotating columns 252 on the left and right sides through the belt 256 transmission system, thereby realizing the synchronous linkage of the left and right rotating shafts 243 and the cam 240.

[0046] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0047] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A pole mounted circuit breaker with a built-in isolating switch, characterized in that: include: A box body (1) is provided with left and right independent insulating chambers (2) in the box body (1), and a power supply input terminal and a load output terminal are provided on the left and right sides of the box body (1) respectively; An isolating switch assembly is arranged in the insulating chamber (2) on the left side, and includes movable contact blades (213) arranged in coordination with each other on the left and right sides. When the switch is closed, the movable contact blades (213) on the left and right sides contact each other and are electrically connected. When the switch is opened, the movable contact blades (213) on the left and right sides can rotate counterclockwise at the same time, quickly separate from each other, and form a clear electrical isolation gap. A circuit breaker assembly, the circuit breaker assembly being arranged in the insulating chamber (2) on the right side, comprising a moving contact (221) and a static contact (222), wherein the moving contact (221) is capable of moving left and right along the circuit breaker body, and the static contact (222) is arranged in the circuit breaker body and cooperates with the moving contact (221) to realize the connection and disconnection of the circuit; The squeezing plates (228) are distributed up and down with respect to the moving contact (221) and are slidably matched with the circuit breaker body up and down. The upper and lower squeezing plates (228) can move toward each other and are used to isolate the moving contact (221) and the static contact (222), thereby achieving safe separation of the moving contact (221) and the static contact (222).

2. The pole-mounted circuit breaker with a built-in disconnector according to claim 1, characterized in that: The power supply input terminal and the load output terminal are respectively provided with an input pole (211) and an output pole (212); the movable contact knife (213) located on the left side is hinged to the right end of the input pole (211); and the movable contact knife (213) located on the right side is hinged to the left end of the conductive pole (214); Push rods (215) are installed at the upper ends of the hinge points of the left and right movable touch knives (213), and a push slide (216) is provided at the upper ends of the push rods (215). The left and right push rods (215) opposite to each other are connected by a cross bar (217), and the left and right ends of the cross bar (217) are slidably matched with the corresponding push slide (216) through a pin shaft, and a vertical rod (218) is installed at the upper end of the cross bar (217).

3. The pole-mounted circuit breaker with a built-in disconnector according to claim 1, characterized in that: Two mounting grooves (230) distributed front and back are opened on the left side of the extrusion plate (228), a wedge-shaped push plate (231) is slidably provided in the mounting groove (230), a mounting rod (232) is installed in the mounting groove (230) and is slidably matched with the wedge-shaped push plate (231) in the mounting groove (230), a support spring (233) sleeved on the mounting rod (232) is connected between the mounting groove (230) and the wedge-shaped push plate (231), and a support plate (234) is connected between the front and rear wedge-shaped push plates (231).

4. The pole-mounted circuit breaker with a built-in disconnector according to claim 3, characterized in that: A control rod (235) that slides with the circuit breaker body up and down is installed on the side of the support plate (234) away from the extrusion plate (228). The end of the control rod (235) away from the support rod is tilted to the left. A triangular block (236) is provided on the right side of the control rod (235). The inclined surface of the triangular block (236) slides with the inclined surface of the control rod (235). A movable frame (237) is connected between the upper and lower opposite triangular blocks (236). The lower end of the movable frame (237) slides with the box body (1) left and right. An elastic telescopic column (238) fixedly connected to the box body (1) is provided on the right side of the triangular block (236) located below.

5. The pole-mounted circuit breaker with built-in disconnector according to claim 1, characterized in that: The static contact (222) is mounted on the left end of the output pole (212), the circuit breaker body is fixedly sleeved on the output pole (212), the left end of the movable contact (221) is mounted with a second conductive column (223), a conductive sleeve (224) fixedly connected to the box (1) is provided between the left and right insulating chambers (2), a conductive disk (225) that slides with the conductive sleeve (224) is mounted on the left end of the second conductive column (223), a conductive rod (226) that slides with the conductive sleeve (224) is mounted on the left end of the conductive disk (225), a connecting spring (227) that is sleeved on the outside of the conductive rod (226) is connected between the conductive disk (225) and the left inner wall of the conductive sleeve (224), and the left end of the conductive rod (226) slides with the first conductive column (214) left and right.

6. The pole-mounted circuit breaker with a built-in disconnector according to claim 5, characterized in that: The right end of the movable contact (221) is provided with a protrusion that plugs into and mates with the stationary contact (222), and a slot (229) that mates with the protrusion is provided on one side of the extrusion plate (228) close to the movable contact (221).

7. A pole mounted circuit breaker with a built-in disconnector according to claim 2 or 4, characterized in that: A slide bar (239) is installed on the right side of the vertical rod (218) and the triangular block (236), and a cam (240) is provided on the right side of the slide bar (239). A side groove (241) that slides with the slide bar (239) is provided on the outside of the cam (240). A roller (242) that rolls in contact with the side groove (241) is rotatably installed on the outside of the slide bar (239). The front and rear cams (240) that are opposite to each other are installed on the same rotating shaft (243).

8. The pole-mounted circuit breaker with a built-in disconnector according to claim 7, characterized in that: A fixed plate (244) rotatably connected to the rotating shaft (243) is installed in the box body (1); a ratchet (245) is installed after the rotating shaft (243) passes through the fixed plate (244); an extension plate (246) fixedly connected to the fixed plate (244) is provided inside the ratchet (245); a sliding block (247) is slidably installed on the extension plate (246); and a ratchet (248) that matches the ratchet (245) is hinged on the upper end of the sliding block (247) through a torsion spring shaft.

9. The pole-mounted circuit breaker with a built-in disconnector according to claim 8, characterized in that: A control plate (249) is installed on the front side of the sliding block (247), a sliding column (250) is installed on the lower end of the control plate (249), and a spiral groove (251) is provided on the outer side of the rotating shaft (243) for sliding engagement with the sliding column (250); A rotating column (252) is rotatably mounted on the front end of the ratchet (245), a fixing bar (253) is mounted on the outside of the rotating column (252), and a semi-annular groove (254) is provided on the ratchet (245) for rotationally cooperating with the fixing bar (253).

10. The pole-mounted circuit breaker with a built-in disconnector according to claim 9, characterized in that: A pulley (255) is installed at the front end of the rotating column (252), and the left and right opposite pulleys (255) are connected by a belt (256). A control shaft rotatably connected to the box (1) is installed at the front end of the pulley (255) on the left.

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