Grading shield and circuit breaker

Abstract

The invention provides a voltage-sharing cover and a circuit breaker, and belongs to the field of large-current switches. The circuit breaker comprises an operating mechanism mounting bracket, an insulating pull rod, a vacuum arc-extinguishing chamber and a bus extension sleeve, the moving end of the vacuum arc-extinguishing chamber is in flexible connection with the bus extension sleeve, the circuit breaker further comprises a voltage-sharing cover, and the voltage-sharing cover comprises a partition wall and a side wall surrounding the edge of the partition wall. The ends of the flexible connection and fastening assembly are located in a shielding cavity defined by the side enclosure wall and the partition wall. The voltage-sharing cover is the voltage-sharing cover in the circuit breaker. According to the invention, the voltage-sharing cover is configured for the flexible connection, and the partition wall of the voltage-sharing cover is located at one side, facing the operating mechanism mounting bracket, of the flexible connection, so that the electric field distribution is more uniform, and the discharge probability between the flexible connection and the operating mechanism mounting bracket is reduced.

Description

Technical Field

[0001] This invention belongs to the field of high-current switches, and in particular relates to an equalizing cover and a circuit breaker. Background Technology

[0002] A circuit breaker is an important electrical device, mainly consisting of a vacuum interrupter, an operating mechanism, and an insulating rod connecting the output end of the operating mechanism and the moving end of the vacuum interrupter. The operating mechanism can push and pull the vacuum interrupter through the insulating rod to realize the switching on and off of the circuit.

[0003] The moving end of the vacuum interrupter needs to be connected to other equipment outside the circuit breaker cabinet. Usually, a busbar extension bushing is installed on the cabinet, and a copper hose is connected between the busbar extension bushing and the moving end of the vacuum interrupter. For example, the circuit breaker switch disclosed in Chinese Utility Model Patent No. CN220710192U has the same structure.

[0004] Copper foil is made of several layers of copper foil stacked together, and can be easily bent and deformed to allow the movement of the moving end of the vacuum interrupter. In the Chinese utility model patent with authorization announcement number CN220710192U, the copper foil is initially bent into an L-shaped structure. After repeated movement of the moving end, the copper foil is easily stretched and bent, resulting in creases. This can lead to discharge between the copper foil and the mounting bracket of the ground potential operating mechanism.

[0005] See appendix Figure 1 To protect the flexible copper connector (i.e., flexible connection 6) and keep it as far away as possible from the operating mechanism mounting bracket 3, existing technology also sets the busbar extension sleeve 5 in an L-shape, with the end used for connecting to the flexible copper connector facing downwards. This ensures that the flexible copper connector maintains a basically horizontal extension during use. However, since the area between the flexible copper connector and other components consists of dispersed copper foil sheets, and these copper foil sheets are relatively easy to deform under stress, the shape of the flexible copper connector becomes irregular. This results in an uneven electric field distribution between the flexible copper connector and the operating mechanism mounting bracket 3, still posing a high risk of discharge.

[0006] The irregular shape of the copper interrupter is due to two main reasons. First, a certain length allowance needs to be reserved during installation, resulting in some bending in its extension direction. Second, the copper interrupter deforms under stress during use. The connection point between the copper interrupter and the moving end of the vacuum interrupter can be moved by the moving end, causing deformation. Alternatively, it can be driven by the electromagnetic force of adjacent phase copper interrupters, causing it to swing perpendicular to the displacement direction of the moving end of the vacuum interrupter, thus deforming it. Summary of the Invention

[0007] The purpose of this invention is to provide a circuit breaker to solve the technical problem of easy discharge between the copper flexible circuit breaker and the mounting bracket of the operating mechanism in the prior art; Another object of the present invention is to provide a pressure equalization shield to solve the above-mentioned technical problems.

[0008] To achieve the above objectives, the technical solution for the circuit breaker provided by this invention is as follows: A circuit breaker includes an operating mechanism mounting bracket, an insulating tie rod, a vacuum interrupter, and a busbar extension bushing. The moving end of the vacuum interrupter is connected to the busbar extension bushing via a flexible connection. The circuit breaker also includes an equalizing shroud fixedly installed within the circuit breaker and communicating with the flexible connection. The equalizing shroud includes a partition wall and a side wall surrounding the edge of the partition wall. The flexible connection and the fastening assembly for connecting the flexible connection and the busbar extension bushing are both located within the shielded cavity enclosed by the side wall and the partition wall. The partition wall is a flat plate structure and is located on the side of the flexible connection facing the operating mechanism mounting bracket to uniformly distribute the electric field between the flexible connection and the operating mechanism mounting bracket. The partition wall has perforations through which the insulating tie rod and the busbar extension bushing pass.

[0009] As a further improvement, a flexible connection, a busbar extension sleeve, and a fastening assembly for connecting the two constitute a busbar assembly. An equalizing cover is installed on the busbar assembly. One of the equalizing cover and the busbar assembly is provided with a limiting recess, and the other is provided with a limiting protrusion that can be inserted into the limiting recess and stop the limiting recess in a direction perpendicular to the partition wall.

[0010] As a further improvement, the limiting recess is a slot provided on the inner side of the side wall. The fastening assembly includes a screw and a washer that is pressed and fixed to the flexible connection by the screw. The washer partially engages with the slot and blocks and limits the slot side wall in the direction perpendicular to the partition wall. The portion of the washer that is inserted into the slot constitutes the limiting protrusion.

[0011] As a further improvement, the side wall of the card slot is set in the same direction as the length of the pressure equalization cover along the length of the pressure equalization cover.

[0012] As a further improvement, the width of the shielding cavity is adapted to the width of the flexible connection to constrain the flexible connection in the width direction.

[0013] As a further improvement, the perforation on the partition wall through which the busbar expansion bushing passes is a positioning perforation, which is positioned and engaged with the conductive rod of the busbar expansion bushing on the extended plane of the partition wall.

[0014] The beneficial effects are as follows: The circuit breaker provided by this invention is an improvement on the prior art. This circuit breaker is equipped with an equalizing shield for the flexible connection, with the flexible connection located inside the equalizing shield. The flat partition wall on the equalizing shield is positioned on the side of the flexible connection facing the operating mechanism mounting bracket. Thus, regardless of the state of the flexible connection itself, the equalizing shield and the operating mechanism mounting bracket always maintain a plate-to-plate structure, resulting in a more uniform and stable electric field between them, effectively reducing the probability of discharge.

[0015] To achieve the above objectives, the technical solution of the equalizing shield provided by this invention is as follows: An equalizing shield includes a partition wall and a side wall surrounding the edge of the partition wall. The space enclosed by the side wall and the partition wall is a shielding cavity for accommodating the flexible connection and the end of the fastening assembly. In use, the equalizing shield is in communication with the flexible connection. The partition wall has a flat plate structure and is located on the side of the flexible connection facing the operating mechanism mounting bracket in use to equalize the electric field between the flexible connection and the operating mechanism mounting bracket. The partition wall is provided with perforations for insulating tie rods and busbar extension sleeves to pass through.

[0016] As a further improvement, a slot is provided on the inner side of the side wall. When in use, the slot engages with the gasket in the fastening assembly and is stopped and limited by the gasket inserted into the slot in a direction perpendicular to the partition wall.

[0017] As a further improvement, the side wall of the card slot is set in the same direction as the length of the pressure equalization cover along the length of the pressure equalization cover.

[0018] As a further improvement, the perforation on the partition wall through which the busbar expansion bushing passes is a positioning perforation. In use, the positioning perforation and the conductive rod of the busbar expansion bushing are positioned and engaged on the extension plane of the partition wall.

[0019] The beneficial effects are as follows: The voltage equalization shield provided by this invention is a pioneering invention. In use, the flexible connector is installed into the voltage equalization shield, and the voltage equalization shield and the flexible connector are made conductive. Simultaneously, the partition wall of the voltage equalization shield is located on the side of the flexible connector facing the operating mechanism mounting bracket. Thus, regardless of the state of the flexible connector itself, the voltage equalization shield and the operating mechanism mounting bracket always maintain a plate-to-plate structure, resulting in a more uniform and stable electric field between them, effectively reducing the probability of discharge. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an existing circuit breaker; Figure 2 This is a schematic diagram of the circuit breaker in the open state, representing a specific embodiment of the circuit breaker of the present invention. Figure 3 This is a schematic diagram of the circuit breaker in the closed state, representing a specific embodiment of the circuit breaker of the present invention. Figure 4 A schematic diagram of the circuit breaker without its cabinet, representing a specific embodiment of the circuit breaker of the present invention; Figure 5 for Figure 2 A magnified view of a section at point A in the middle; Figure 6 This is a partial structural schematic diagram of a specific embodiment 2 of the circuit breaker of the present invention; Figure 7 This is a partial structural schematic diagram of a specific embodiment 3 of the circuit breaker of the present invention; Figure 8 This is a partial structural diagram of embodiment 4 of the circuit breaker of the present invention.

[0021] Explanation of reference numerals in the attached figures: 1. Cabinet; 2. Vacuum interrupter chamber; 3. Operating mechanism mounting bracket; 4. Insulating tie rod; 5. Busbar extension sleeve; 51. Conductive rod; 52. Insulating shell; 6. Flexible connection; 61. Rigid section; 62. Flexible section; 7. Screw; 8. Washer; 9. Equalizing cover; 91. Partition wall; 92. Side wall; 93. Tie rod perforation; 94. Positioning perforation; 95. Slot; 96. Stepped surface; 10. Elastic washer ring. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to specific embodiments.

[0023] Specific embodiment 1 of the circuit breaker provided by the present invention: See appendix Figure 2 Appendix Figure 3 and appendix Figure 4 The circuit breaker is a gas-insulated switchgear circuit breaker, including a cabinet 1 and three-phase lines installed inside the cabinet 1. Each phase line includes a vacuum interrupter 2. A grounded operating mechanism mounting bracket 3 is installed above the vacuum interrupter 2 inside the cabinet 1. An operating mechanism is installed on the operating mechanism mounting bracket 3 to drive the moving end of the vacuum interrupter 2 to move up and down to realize the opening and closing operation. An insulating pull rod 4 is connected between the output end of the operating mechanism and the moving end of the vacuum interrupter 2.

[0024] Each phase line also includes two busbar expansion bushings 5 ​​installed on both sides of the cabinet 1. The busbar expansion bushings 5 ​​are electrically connected to the moving end of the corresponding vacuum interrupter 2 via flexible connections 6.

[0025] Combined with appendix Figure 5 The busbar extension bushing 5 includes an insulating shell 52 and a conductive rod 51 integrally cast inside the insulating shell 52. The insulating shell 52 is fixed and sealed to the cabinet 1. One end of the conductive rod 51 protrudes from the cabinet 1 and is used to connect with other electrical equipment outside the cabinet 1. The other end of the conductive rod 51 extends into the cabinet 1 and faces downward. The entire conductive rod 51 is L-shaped.

[0026] The flexible connection 6 is specifically made of copper and is formed by stacking multiple layers of conductive copper foil. In order to meet the structural strength required for connection with other components, the conductive foil is fused at the molecular level at both ends and the central area in the extension direction of the flexible connection 6 through diffusion bonding to form a relatively rigid segment 61, while in other areas the conductive foils are kept dispersed to ensure that these areas are relatively soft and flexible segments 62 that are easy to bend.

[0027] Each rigid section 61 is provided with a connection hole. The connecting hole on the middle rigid section 61 is through which a stud on the insulating tie rod 4 is inserted. The stud is threadedly connected to the moving end of the vacuum interrupter 2. In this way, the middle rigid section 61 and the moving end of the vacuum interrupter 2 can be pressed and fixed by the insulating tie rod 4, so as to realize the conductive connection between the flexible connection 6 and the moving end of the vacuum interrupter 2.

[0028] The rigid sections 61 at both ends are connected to the two busbar expansion sleeves 5 via fastening assemblies. The fastening assemblies include screws 7 and washers 8. During installation, the rigid section 61 at the end is placed below the conductive rod 51 of the busbar expansion sleeve 5, and the washer 8 is placed below the rigid section 61. The screw 7 passes through the washer 8 and the rigid section 61 in sequence, and finally connects to the threaded hole on the conductive rod 51. The screw 7 presses and fixes the washer 8, the flexible connection 6, and the conductive rod 51 of the busbar expansion sleeve 5 together, and the three are connected.

[0029] As a matching component of screw 7, washer 8 plays the role of distributing pressure evenly and separating screw head 7 from flexible connection 6, thereby avoiding force concentration on flexible connection 6 and preventing screw head 7 from directly scraping flexible connection 6.

[0030] Each flexible connection 6 in this circuit breaker is equipped with an equalizing shield 9. The equalizing shield 9 is made of conductive material. In use, the equalizing shield 9 is connected to the corresponding flexible connection 6 to make their potentials equal. The equalizing shield 9 can uniformly distribute the electric field around the flexible connection busbar, especially between it and the operating mechanism mounting bracket 3, reducing the risk of discharge. The equalizing shield 9 is made of aluminum to reduce weight, but it can also be made of copper.

[0031] Combined with appendix Figure 5 The equalizing shield 9 includes a partition wall 91 and a side wall 92 located at the edge of the partition wall 91. The space enclosed by the partition wall 91 and the side wall 92 is a shielding cavity, and the flexible connection 6 is always located within the shielding cavity during use. All corners of the equalizing shield 9 are rounded. For example, the two ends of the elongated partition wall 91 are rounded, and the side wall 92 extends along the edge of the partition wall 91, its overall shape resembling the outer contour of the partition wall 91. This design minimizes protrusions and sharp points on the outer surface of the equalizing shield 9, resulting in a more uniform electric field and reduced discharge risk.

[0032] In use, the partition wall 91 of the equalizing shield 9 is located above the flexible connection 6, thereby separating the flexible connection 6 from the operating mechanism mounting bracket 3. The partition wall 91 has a flat plate structure, forming a plate-plate electrode with a uniform electric field between it and the operating mechanism mounting bracket 3, which has good insulation performance and reduces the risk of discharge. The lower surface of the partition wall 91, that is, its inner surface, rests on the upper side of the rigid sections 61 at both ends of the flexible connection 6 and makes contact with the flexible connection 6 for conduction. The rigid sections 61 at both ends of the flexible connection 6 can provide a certain degree of support for the equalizing shield 9.

[0033] The partition wall 91 has perforations at the middle and both ends. The middle perforation is a rod through-hole 93 for the insulating rod 4 to pass through, allowing the insulating rod 4 to move up and down in the hole. The perforations at both ends are for the conductive rods 51 of the busbar extension sleeve 5 to pass through, so that the conductive rods 51 can directly contact and conduct with the flexible busbar. The size of the perforation is adapted to the size of the conductive rod 51, so that the perforation can be used as a positioning perforation 94 to position and cooperate with the corresponding conductive rod 51 on the extension plane of the partition wall 91. By using two conductive rods 51 and two positioning perforations 94, the equalizing cover 9 can be positioned and prevented from rotating in various horizontal directions at the same time.

[0034] The flexible connector 6, the busbar expansion sleeve 5, and the fastening assembly for connecting the two constitute the busbar assembly. The equalizing cover 9 is installed on the busbar assembly. One of the equalizing cover 9 and the busbar assembly is provided with a limiting recess, and the other is provided with a limiting protrusion that can be inserted into the limiting recess and stop the limiting recess in a direction perpendicular to the partition wall 91. The cooperation of the limiting protrusion and the limiting recess can realize the limiting of the equalizing cover 9 in the vertical direction, preventing the equalizing cover 9 from moving up and down.

[0035] Specifically, at both ends of the equalizing shield 9 along its length, the inner side of the side wall 92 is provided with a slot 95. The depth direction of the slot 95 is in the same direction as the length direction of the equalizing shield 9, and the slot 95 constitutes the aforementioned limiting recess. The gasket 8 has an elongated structure, with one end of the gasket 8 protruding from the flexible connection 6 and inserted into the slot 95 along its depth direction. The vertical width of the slot 95 matches the thickness of the gasket 8, so that the gasket 8 can stop and cooperate with the upper and lower side walls of the slot 95 in the vertical direction, respectively, thereby limiting the equalizing shield 9 in the vertical direction and preventing the equalizing shield 9 from moving up and down. In this embodiment, the part of the gasket 8 inserted into the slot 95 constitutes the limiting protrusion. At the same time, the gasket 8 also plays a conductive role between the equalizing shield 9 and the flexible connection 6, increasing the conductive path between the equalizing shield 9 and the flexible connection 6. The gasket 8 is oblong in shape, which can reduce the probability of tip discharge.

[0036] The shielding cavity of the equalizing cover 9 has a certain depth, which ensures that the rigid section 61 and flexible section 62 of the flexible connection 6 remain within the equalizing cover 9 regardless of whether the circuit breaker is in the open or closed state. The width of the shielding cavity of the equalizing cover 9 is adapted to the width of the flexible connection 6, so that the equalizing cover 9 can constrain the flexible connection 6 in its width direction, suppress the swaying of the flexible connection 6 in this direction, and prevent the flexible connection 6 from swaying and tearing under the action of electromagnetic force in this direction.

[0037] The equalizing cover 9 can be directly installed inside the circuit breaker when it leaves the factory, so that the circuit breaker can be put into use as a new type of circuit breaker; the equalizing cover 9 can also be installed on the same type of circuit breaker that has been put into use on the market, so that the circuit breaker can be upgraded and transformed.

[0038] When upgrading existing circuit breakers, simply replacing the gasket 8 in the original circuit breaker with the oblong gasket 8 in this embodiment allows for the installation of the equalizing cover 9, resulting in high efficiency and low cost. Furthermore, during use, the screw heads 7 used to connect the flexible connector 6 and the conductive rod 51, as well as the gasket 8, are all located within the equalizing cover 9, thus receiving shielding protection and reducing the probability of discharge at these locations. This not only facilitates the installation of the equalizing cover 9 without introducing a new installation structure but also improves the electrical performance of the existing installation structure.

[0039] Before installing the equalizing cover 9, it is necessary to disconnect the connection between the flexible connection 6 and the busbar expansion sleeve 5, as well as the connection between the flexible connection 6 and the moving end of the vacuum interrupter 2. Then, place the equalizing cover 9 in place, so that the conductive rod 51 and the insulating pull rod 4 in the busbar expansion sleeve 5 pass through the corresponding through holes on the equalizing cover 9. Finally, install the flexible connection 6. During the installation of the flexible connection 6, the gasket 8 is inserted into the corresponding slot 95. After the flexible connection 6 is installed, the equalizing cover 9 is also fixed at the same time.

[0040] Specific embodiment 2 of the circuit breaker provided by the present invention: This embodiment is based on embodiment 1. The difference between this embodiment and embodiment 1 is that the installation method of the pressure equalization cover 9 has been changed in this embodiment.

[0041] Specifically, see Appendix Figure 6 In this embodiment, the limiting recess is a slot 95 provided on the inner side of the side wall 92. The rigid section 61 at the end of the flexible connection 6 is inserted into the slot 95 and is blocked and limited by the slot side wall of the slot 95 in the direction perpendicular to the insertion. The part of the rigid section 61 used to insert into the slot 95 constitutes the limiting protrusion.

[0042] This embodiment is applicable to situations where a significant portion of the rigid section 61 protrudes beyond the conductive rod 51, in which case a standard gasket 8 can be used.

[0043] Specific embodiment 3 of the circuit breaker provided by the present invention: This embodiment is based on embodiment 1. The difference between this embodiment and embodiment 1 is that the installation method of the pressure equalization cover 9 has been changed in this embodiment.

[0044] Specifically, see Appendix Figure 7 The limiting recess is a slot 95 set on the inner side of the side wall 92. The rigid section 61 at the end of the flexible connection 6 and the gasket 8 are inserted into the corresponding slot 95. The gasket 8 and the rigid section 61 respectively stop and limit the upper and lower side walls of the slot 95 in the vertical direction. The part of the gasket 8 and the rigid section 61 used to insert into the slot 95 together constitute the limiting protrusion.

[0045] Specific embodiment 4 of the circuit breaker provided by the present invention: This embodiment is based on embodiment 1. The difference between this embodiment and embodiment 1 is that the installation method of the pressure equalization cover 9 has been changed in this embodiment.

[0046] In this embodiment, the limiting recess is provided on the busbar assembly, while the limiting protrusion is provided on the equalizing cover 9.

[0047] Specifically, see Appendix Figure 8 Since one end of the gasket 8 protrudes from the conductive rod 51 of the flexible connection 6 and the busbar extension sleeve 5, and there is an insulating shell 52 on the outside of the conductive rod 51, the insulating shell 52, the conductive rod 51 and the gasket 8 can form an annular space, which can constitute a limiting recess.

[0048] Correspondingly, the portion of the equalizing cover 9 located between the gasket 8 and the insulating shell 52 of the busbar expansion bushing 5 can form a limiting protrusion. After the gasket 8 is installed, the limiting protrusion on the equalizing cover 9 is naturally locked in the limiting recess, thereby achieving the limiting of the equalizing cover 9 in the vertical direction.

[0049] Considering that there may be a certain space between the upper side of the equalizing cover 9 and the lower end face of the insulating shell 52 of the busbar expansion bushing 5, in order to ensure the stability of the equalizing cover 9, an insulating elastic gasket 10 can be set in the space so that the elastic gasket 10 is tightly pressed against both the equalizing cover 9 and the busbar expansion bushing 5.

[0050] Compared to embodiment 1, this embodiment does not require machining a slot 95 on the pressure equalization cover 9. Instead, it only requires machining a stepped surface 96 on the corresponding side wall 92 of the pressure equalization cover 9 for the gasket 8 to abut against it, which reduces the machining difficulty of the pressure equalization cover 9. Moreover, no insertion operation is required during assembly, which reduces the assembly difficulty.

[0051] In other embodiments of this implementation, the annular space enclosed by the rigid section 61 at the end of the flexible connection 6, the conductive rod 51 of the busbar extension sleeve 5, and the insulating shell 52 can be used as a limiting recess, and the portion of the equalizing cover 9 located within the annular space can be used as a limiting protrusion.

[0052] Specific embodiment 5 of the circuit breaker provided by the present invention: This embodiment is based on embodiment 1, but the difference between the two is that the installation method of the equalizing cover has been changed in this embodiment.

[0053] Specifically, in this embodiment, a downward-facing flat surface is left on the insulating shell of the busbar expansion bushing as the mounting surface of the equalizing cover. An insert with the mounting surface exposed is pre-embedded in the insulating shell. The length of the equalizing cover is increased so that the equalizing cover can cover the mounting surface on the insulating shell. At the same time, mounting holes are machined on the equalizing cover at the positions corresponding to the inserts. A screw with additional configuration is threaded through the mounting holes and connected to the insert, thereby realizing the installation of the equalizing cover.

[0054] In this embodiment, the structure of the busbar expansion bushing was modified in order to install the equalizing cover. Therefore, it is not applicable to the modification and upgrading of circuit breakers already in use, but is applicable to the production of new circuit breakers.

[0055] In other embodiments, the equalizing shield can also be installed on other insulating components in the circuit breaker in the same manner.

[0056] Specific embodiment 6 of the circuit breaker provided by the present invention: This embodiment is based on embodiment 1. The difference between this embodiment and embodiment 1 is that each perforation on the partition wall in this embodiment is only for the conductive rod and insulating tie rod in the busbar expansion bushing to pass through, and does not serve a positioning function.

[0057] In this embodiment, the slot and the gasket are fitted together very carefully to achieve positioning in all directions.

[0058] Specific embodiment 7 of the circuit breaker provided by the present invention: This embodiment is based on embodiment 1. The difference between this embodiment and embodiment 1 is that the width of the shielding cavity is larger than the width of the flexible connection, so that the equalizing cover only serves to equalize the electric field.

[0059] Specific embodiment 8 of the circuit breaker provided by the present invention: This embodiment is based on embodiment 1. The difference between this embodiment and embodiment 1 is that a buckle plate is also provided at the lower opening of the equalizing hood in this embodiment. A clearance hole is provided in the middle of the buckle plate for the moving end of the vacuum interrupter to pass through. The buckle plate also needs to be placed in place in advance and then buckled to the lower side of the equalizing hood after the flexible connection is installed.

[0060] A snap-fit ​​connection structure is provided between the buckle plate and the equalizing cover. The snap-fit ​​connection structure includes a barbed spring arm set at the edge of the buckle plate and a mating groove set on the inner side of the side wall of the equalizing cover. After the spring arm is snapped into the mating groove, the buckle plate and the equalizing cover can be connected. In this way, the soft connection can be completely covered. Moreover, the outer surfaces of both the buckle plate and the equalizing cover are flat, which is conducive to the uniformity of the electric field.

[0061] Specific embodiment 9 of the circuit breaker provided by the present invention: This embodiment is based on embodiment 1. The difference between this embodiment and embodiment 1 is that the gasket in this embodiment is a perfect circle, but the opening on the gasket is offset, so that one side of the gasket protrudes out of the flexible connection and can be snapped into the slot.

[0062] Specific embodiment 10 of the circuit breaker provided by the present invention: This embodiment is based on embodiment 1. The difference between this embodiment and embodiment 1 is that the length direction of the gasket is perpendicular to the length direction of the pressure equalization cover, and the slots are set on both sides of the width direction of the pressure equalization cover.

[0063] During assembly, first align the length of the gasket with the length of the equalizing cover so that the gasket can enter the equalizing cover. Then rotate the gasket 90 degrees so that both ends of the gasket are respectively inserted into the slots on both sides of the width direction of the equalizing cover. Finally, install the screws to fix it in place.

[0064] This allows both ends of the gasket to engage with the slots, increasing the area where the pressure equalizing cover is restricted, which helps improve the stability of the pressure equalizing cover. However, compared to embodiment 1, in this embodiment, the side walls on both sides of the pressure equalizing cover in the width direction need to be thickened to allow for the processing of the slots, resulting in a greater overall weight for the pressure equalizing cover.

[0065] Specific embodiments of the equalizing shield provided by the present invention: The equalizing cover is the same as the equalizing cover in the above-described embodiment of the circuit breaker, and will not be described again.

[0066] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A circuit breaker comprising an operating mechanism mounting bracket, an insulating link, a vacuum interrupter and a bus expansion bushing, the moving end of the vacuum interrupter and the bus expansion bushing being connected by a flexible connection, characterized in that, The equalizing cover is fixedly installed in the circuit breaker and is in conduction with the flexible connection, the equalizing cover comprises a partition wall and a side wall arranged around the edge of the partition wall, the flexible connection and the end of the fastening assembly for connecting the flexible connection and the busbar extension sleeve are located in a shielding cavity surrounded by the side wall and the partition wall, the partition wall is in a flat plate structure and is located on the side of the flexible connection facing the operating mechanism mounting bracket to uniformly distribute the electric field between the flexible connection and the operating mechanism mounting bracket, and a through hole is arranged on the partition wall for the insulating pull rod and the busbar extension sleeve to pass through.

2. The circuit breaker of claim 1, wherein, The flexible connection, the busbar extension sleeve and the fastening assembly for connecting the two constitute a busbar assembly, the equalizing cover is installed on the busbar assembly, a limiting recess is arranged on one of the equalizing cover and the busbar assembly, and a limiting protrusion capable of being clamped into the limiting recess and limiting the limiting recess in the direction perpendicular to the partition wall is arranged on the other.

3. The circuit breaker of claim 2, wherein, The limiting recess is a clamping groove arranged on the inner side of the side wall, the fastening assembly comprises a screw and a gasket fixedly pressed on the flexible connection by the screw, the gasket is partially in conduction with the clamping groove and is limited and stopped in the direction perpendicular to the partition wall by the groove side wall of the clamping groove, and the part of the gasket inserted into the clamping groove constitutes the limiting protrusion.

4. The circuit breaker of claim 3, wherein, The side wall where the clamping groove is arranged is in the length direction of the equalizing cover, and the groove depth direction of the clamping groove is in the same direction as the length direction of the equalizing cover.

5. The circuit breaker of any one of claims 1-4, wherein, The width dimension of the shielding cavity is matched with the width dimension of the flexible connection to constrain the flexible connection in the width direction.

6. The circuit breaker of any one of claims 1-4, wherein, The through hole on the partition wall for the busbar extension sleeve to pass through is a positioning through hole, and the positioning through hole is in positioning cooperation with the conductive rod of the busbar extension sleeve in the extension plane of the partition wall.

7. An equalizer characterized by, The side wall and the partition wall surround a space for accommodating the flexible connection and the end of the fastening assembly, the equalizing cover is in conduction with the flexible connection in use, the partition wall is in a flat plate structure and is located on the side of the flexible connection facing the operating mechanism mounting bracket in use to uniformly distribute the electric field between the flexible connection and the operating mechanism mounting bracket, and a through hole is arranged on the partition wall for the insulating pull rod and the busbar extension sleeve to pass through.

8. The equalizer of claim 7, wherein, The inner side of the side wall is provided with a clamping groove, and the clamping groove is in insertion cooperation with the gasket in the fastening assembly and is limited and stopped in the direction perpendicular to the partition wall by the gasket inserted into the clamping groove in use.

9. The equalizer of claim 8, wherein, The side wall where the clamping groove is arranged is in the length direction of the equalizing cover, and the groove depth direction of the clamping groove is in the same direction as the length direction of the equalizing cover.

10. The equalizing cage according to any of claims 7-9, characterized in that The through hole on the partition wall for the busbar extension sleeve to pass through is a positioning through hole, and the positioning through hole is in positioning cooperation with the conductive rod of the busbar extension sleeve in the extension plane of the partition wall in use.

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