Double-break switch module of upper isolation environment-friendly cabinet

Abstract

The invention discloses a double-break switch module of an upper isolation environment-friendly cabinet, and belongs to the technical field of ring main units, the double-break switch module of the upper isolation environment-friendly cabinet comprises an upper isolation static contact knife, a lower isolation static contact knife and a grounding contact knife which adopt irregular curve outer convex shapes, and the grounding contact knife is arranged on the upper isolation environment-friendly cabinet while the movement gap of parts is ensured. The contactable area of the moving knife contact and the contact knife is larger, the error-tolerant rate of the product is increased, and the reliability of the product is improved. On the premise that the overall size of the ring main unit is small, it can be guaranteed that the electrical gap between the disconnecting links is large enough, and the insulation capacity of products is improved. Buffering pad structures are designed on the grounding contact knife and the isolation upper static contact knife, so that energy impact caused by swinging of the moving knife can be effectively absorbed, and the stopping position of swinging of the moving knife can be accurately controlled. The service life of the product can be prolonged under the combined action and cooperation of the buffer pad structure, the limiting structure and the contact pressure.

Description

Technical Field

[0001] The invention relates to the technical field of ring network cabinets, and in particular to a double-break switch module of an upper isolation environmental protection cabinet. Background Art

[0002] At present, the existing ring main unit mainly includes gas insulated ring main unit, solid insulated ring main unit, etc. With the transformation of the power industry and the need for dual carbon goals, the environmental protection cabinet in the gas insulated ring main unit is widely used because of its good insulation performance, environmental friendliness and pollution-free. The environmental protection cabinet generally uses dry air or nitrogen as the gas insulation medium. Compared with the traditional SF6 gas insulation, it requires a larger insulation distance, requiring the electrical clearance distance between the break and the ground to be greater than 120mm. If a single-break switch is used, the overall size of the ring main unit will be larger, increasing the floor space of the cabinet and affecting the cost of use. When closing the switch, the isolation moving knife of the existing switch module is prone to over-closing or under-closing, which will lead to poor contact at the contact part, causing heat, and then causing great harm to the normal operation of the ring main unit. The double-break switch module has a greater possibility of poor closing contact because its moving knife needs to close two static knives and one ground knife, which is more likely to cause poor closing contact and more likely to cause poor closing contact. Summary of the invention

[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a double-break switch module for an upper isolation environmental protection cabinet, which can ensure that the electrical gap between the knife switches is large enough under the premise that the overall size of the ring network cabinet is small, thereby improving the insulation capacity of the product.

[0004] The double-break switch module of the upper isolation environmental protection cabinet according to the embodiment of the present invention comprises: a front mounting plate and a rear mounting plate, the front mounting plate and the rear mounting plate are arranged parallel to each other; a circuit breaker module, the circuit breaker module is arranged between the front mounting plate and the rear mounting plate, and the upper end of the circuit breaker module comprises an isolation lower static contact knife; an isolation static knife module, the isolation static knife module is arranged between the front mounting plate and the rear mounting plate, and the lower end of the isolation static knife module comprises an isolation upper static contact knife; a grounding module, the grounding module is arranged between the front mounting plate and the rear mounting plate, the outside of the grounding module is connected to the environmental protection cabinet gas box, and the grounding module comprises a grounding contact knife; an isolation spindle module, the isolation spindle module comprises a first rotating shaft, the first rotating shaft is arranged between the front mounting plate and the rear mounting plate, and three isolation knife sleeves are arranged on the first rotating shaft at equal intervals, Two moving knives are arranged in each isolation knife sleeve. The moving knife and the isolation knife sleeve are fixedly connected by three nylon pins. The first screw passes through the two ends of the moving knife and is tightened by the first locking nut. A shaft sleeve is sleeved on the first screw, and the shaft sleeve is located between two adjacent moving knives. A compression spring is sleeved on the screw head of the first screw. Two raised moving knife contacts are respectively arranged at the two ends of the moving knife. The first rotating shaft is rotated to make the moving knife contact and separate with the corresponding contact knife. One end of the moving knife moves between the grounding contact knife and the lower isolation static contact knife, and the other end of the moving knife moves between the lower isolation static contact knife and the upper isolation static contact knife. When the moving knife is closed into the corresponding contact knife, the two moving knife contacts are in contact with the corresponding contact knife. The thickness of the corresponding contact knife is slightly thicker than the length of the shaft sleeve. Under the action of the compression spring, the two moving knives are pressed on the contact knife.

[0005] The double-break switch module of the upper isolation environmental protection cabinet according to the embodiment of the present invention has at least the following beneficial effects: the scheme of isolating the upper static contact knife, isolating the lower static contact knife and the grounding contact knife by using an irregular curve convex shape, while ensuring the clearance for the movement of the components, making the contact area between the moving knife contact and the contact knife larger, so that the contact knives can be reliably contacted when rotating 58° to 62°, increasing the fault tolerance of the product and improving the reliability of the product. It can ensure that the electrical gap between the knife switches is large enough under the premise that the overall size of the ring network cabinet is small, thereby improving the insulation capacity of the product.

[0006] According to some embodiments of the present invention, the circuit breaker module includes: an arc extinguishing chamber bracket, the arc extinguishing chamber bracket is fixed between the front mounting plate and the rear mounting plate, the arc extinguishing chamber is arranged in the arc extinguishing chamber bracket, and the isolating lower static contact knife is arranged at the top of the arc extinguishing chamber; a circuit breaker main shaft, the circuit breaker main shaft is installed on the arc extinguishing chamber bracket, the circuit breaker main shaft is connected to the arc extinguishing chamber, and rotating the circuit breaker main shaft can drive the closing and opening of the break in the arc extinguishing chamber.

[0007] According to some embodiments of the present invention, the isolating lower static contact blade includes a first base and a first contact blade, the first base is fixed on the arc extinguishing chamber bracket, and the first contact blade is integrally formed on the first base.

[0008] According to some embodiments of the present invention, a dynamic sealing flange is sleeved on the front end of the first rotating shaft, and the dynamic sealing flange is connected to an isolation operating mechanism outside the air box of the environmental protection cabinet, and the first rotating shaft is driven to rotate through the operating mechanism. An insulating umbrella skirt sleeve is provided on the first rotating shaft, and the insulating umbrella skirt sleeve is located behind the first rotating shaft. Three isolation knife sleeves are all located behind the insulating umbrella skirt sleeve, and an insulating sleeve is provided at one end of the first rotating shaft close to the rear mounting plate.

[0009] According to some embodiments of the present invention, the isolation static knife module includes an isolation static knife frame, which is fixed between a front mounting plate and a rear mounting plate, and is provided with a plurality of raised rectangular umbrella skirts, and three copper rods are evenly spaced and penetrated on the isolation static knife frame, and the isolation upper static contact knife is fixed at the lower end of the copper rod.

[0010] According to some embodiments of the present invention, the isolation upper static touch knife includes a second base, a second touch blade and a limit plate. The second base is fixed on the isolation static knife module. The second touch blade and the limit plate are integrally formed on the second base. The limit plate is perpendicular to the second touch blade. The limit plate is used to prevent the movable knife from excessively rotating and swinging out the second touch blade.

[0011] According to some embodiments of the present invention, a first buffer pad is provided on the limiting piece.

[0012] According to some embodiments of the present invention, the grounding module includes a grounding bracket fixed between the front mounting plate and the rear mounting plate, a grounding copper bar is arranged on the grounding bracket, and a grounding contact is fixed at the lower end of the grounding copper bar.

[0013] According to some embodiments of the present invention, the grounding contact knife includes a third base and a third contact blade. The third base is fixed on the grounding copper busbar. The third contact blade is integrally formed on the third base. The third base is used to prevent the movable knife from excessively rotating and swinging out the third contact blade.

[0014] According to some embodiments of the present invention, a second buffer pad is disposed on the third base.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0017] Figure 1 It is a structural schematic diagram of a double-break switch module of an upper isolation environmental protection cabinet according to an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 Structural diagram of the circuit breaker module;

[0019] Figure 3 yes Figure 2 Schematic diagram of the internal structure of the circuit breaker module;

[0020] Figure 4 yes Figure 2 Structural diagram of the static contact knife under the middle isolation;

[0021] Figure 5 yes Figure 1 Schematic diagram of the structure of the isolated spindle module;

[0022] Figure 6 yes Figure 5 Schematic diagram of the internal structure of the isolated spindle module;

[0023] Figure 7 yes Figure 6 Schematic diagram of the structure of the middle moving knife;

[0024] Figure 8 yes Figure 1 Structural diagram of the middle isolation static knife module;

[0025] Fig. 9 yes Figure 8 Structural diagram of the static contact knife on the middle isolation;

[0026] Fig.10 yes Figure 8 A structural diagram of the static contact knife on the middle isolation from another perspective;

[0027] Fig.11 yes Figure 1 The structural diagram of the grounding module;

[0028] Fig.12 yes Figure 1 A structural diagram of the grounding module from another perspective;

[0029] Fig.13 yes Fig.11 Schematic diagram of the structure of the middle ground contact knife.

[0030] Reference numerals:

[0031] Circuit breaker module 1; isolation spindle module 2; isolation static knife module 3; grounding module 4; rear mounting plate 5; front mounting plate 6;

[0032] Circuit breaker main shaft 101; arc extinguishing chamber bracket 102; arc extinguishing chamber 103; isolating lower static contact knife 104;

[0033] A first base 104-1; a first contact blade 104-2;

[0034] First rotating shaft 201; isolation knife sleeve 202; moving knife 203; dynamic sealing flange 204; insulating shed 205; insulating sleeve 206;

[0035] Nylon pin 207; compression spring 208; first screw 209; first locking nut 210; shaft sleeve 211;

[0036] Moving knife contact 203-1;

[0037] Isolation static knife holder 301; isolation upper static contact knife 302; copper rod 303; first buffer pad 304; second screw 305;

[0038] A second locking nut 306;

[0039] A second base 302-1; a second contact blade 302-2; a limiting piece 302-3;

[0040] Grounding bracket 401; grounding contact blade 402; grounding copper bar 403; second buffer pad 404; third screw 405; fourth screw 406;

[0041] A third locking nut 407; a fourth locking nut 408;

[0042] The third base 402-1; the third contact blade 402-2. DETAILED DESCRIPTION

[0043] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0044] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0046] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0047] refer to Figures 1 to 13 A double-break switch module of an upper isolation environmental protection cabinet according to an embodiment of the present invention is described.

[0048] like Figures 1 to 13 As shown, the double-break switch module of the upper isolation environmental protection cabinet according to an embodiment of the present invention includes: a circuit breaker module 1, an isolation static knife module 3, a grounding module 4, an isolation spindle module 2, a front mounting plate 6 and a rear mounting plate 5. The front mounting plate 6 and the rear mounting plate 5 are arranged parallel to each other; the circuit breaker module 1 is arranged between the front mounting plate 6 and the rear mounting plate 5, and the upper end of the circuit breaker module 1 includes an isolating lower static contact knife 104; the isolating static knife module 3 is arranged between the front mounting plate 6 and the rear mounting plate 5, and the lower end of the isolating static knife module 3 includes an isolating upper static contact knife 302; the grounding module 4 is arranged between the front mounting plate 6 and the rear mounting plate 5, and the outside of the grounding module 4 is connected to the environmental protection cabinet gas box, and the grounding module 4 includes a grounding contact knife 402; the isolating spindle module 2 includes a first rotating shaft 201, and the first rotating shaft 201 is arranged between the front mounting plate 6 and the rear mounting plate 5, and three isolating knife sleeves 202 are evenly spaced on the first rotating shaft 201, and each isolating knife sleeve 202 is provided with two moving knives 203, and the moving knife 203 is fixedly connected to the isolating knife sleeve 202 by three nylon pins 207, and is fixedly connected by a first screw 209. The first screw 209 passes through both ends of the movable knife 203 and is tightened by the first locking nut 210. A shaft sleeve 211 is sleeved on the first screw 209, and the shaft sleeve 211 is located between two adjacent movable knives 203. A compression spring 208 is sleeved on the screw head of the first screw 209. Two protruding movable knife contacts 203-1 are respectively arranged at both ends of the movable knife 203. The first rotating shaft 201 is rotated to make the movable knife 203 contact and separate with the corresponding contact knife. One end of the movable knife 203 moves between the ground contact knife 402 and the lower isolated static contact knife 104, and the other end of the movable knife 203 moves between the lower isolated static contact knife 104 and the upper isolated static contact knife 302. When the movable knife 203 is closed into the corresponding contact knife, the two movable knife contacts 203-1 contact with the corresponding contact knife. The thickness of the corresponding contact knife is slightly thicker than the length of the shaft sleeve 211. Under the action of the compression spring 208, the two movable knives 203 are pressed on the contact knife.

[0049] like Figures 5 to 7As shown, two moving knives 203 are installed inside the isolation knife sleeve 202. The moving knives 203 and the isolation knife sleeve 202 are fixedly connected by three nylon pins 207. The first screw 209 passes through the two ends of the moving knives 203 and is tightened by the first locking nut 210. Between the two moving knives 203, the first screw 209 is sleeved with a shaft sleeve 211 to prevent the two moving knives 203 from merging. The screw head of the first screw 209 is sleeved with a compression spring 208, which can make the two moving knives 203 tightly pressed on the shaft sleeve 211. Two protruding moving knife contacts 203-1 are designed at both ends of the moving knife 203. When the moving knife 203 rotates, such as when the moving knife 203 is closed into the isolation lower static contact knife 104, the two moving knife contacts 203-1 contact with the first contact blade 104-2. The use of contact contact ensures contact reliability while preventing adhesion between the contact knives, resulting in the inability to separate when opening the switch. The thickness of the first contact blade 104-2 is slightly thicker than the length of the sleeve 211. Under the action of the compression spring 208, the two movable knives 203 are only pressed on the isolated lower static contact blade 104, and the contact pressure between the contact knives is about 230N~250N, which ensures the contact reliability between the contact knives and prevents adhesion between the contact knives.

[0050] The material of the first rotating shaft 201 is epoxy resin plus glass fiber, which ensures the structural strength and insulation capacity. The top of the first rotating shaft 201 is covered with a dynamic sealing flange 204, which is connected to the isolation operating mechanism outside the environmental protection cabinet gas box. The first rotating shaft 201 is driven by the operating mechanism to drive the entire isolation spindle module 2 to rotate. The default static position is the isolation moving knife 203 split state. At this time, the electrical clearance distance between the fracture and the relative ground exceeds 135mm, which improves the insulation performance of the product. The isolation spindle module 2 rotates 60° counterclockwise from the static position to the isolation closing state, and rotates 60° clockwise from the static position to the grounding closing state.

[0051] The insulating umbrella skirt 205 is sleeved on the first rotating shaft 201 and is located at the rear end of the dynamic sealing flange 204. The material is nylon plus glass fiber, which is used to increase the insulation distance from the moving knife 203 to the dynamic sealing flange 204, and improve the insulation capacity of the product. Behind the insulating umbrella skirt 205, three isolation knife sleeves 202 are installed respectively, which are installed on the first rotating shaft 201. The isolation knife sleeves 202 are used to protect the moving knife 203 and increase the insulation distance between the moving knives 203. At the rear end of the isolation knife sleeve 202, an insulating sleeve 206 is installed. The other end of the insulating sleeve 206 is a rear mounting plate 5, which is used to clamp the three isolation knife sleeves 202 to prevent the isolation knife sleeves 202 from sliding on the first rotating shaft 201, so that the moving knife 203 can be aligned and closed into the static contact knife or the grounding contact knife 402 when closing the switch.

[0052] The double-break switch module of the upper isolation environmental protection cabinet can ensure that the electrical clearance between the knife switches exceeds 135mm when the width of the environmental protection cabinet is 420mm, which greatly improves the insulation capacity of the product. The scheme of isolating the upper static contact knife 302, isolating the lower static contact knife 104 and the grounding contact knife 402 with an irregular curve convex shape is adopted. While ensuring the clearance for the movement of the components, the contact area between the moving knife contact 203-1 and the contact knife is larger, so that the contact knives can be reliably contacted when rotating 58° to 62°, which increases the fault tolerance rate of the product and improves the reliability of the product.

[0053] like Figure 1 As shown, the front mounting plate 6 and the rear mounting plate 5 are the frame structure of the double-break switch module, which can be installed with various modules. The thickness is at least 5 mm and 304 stainless steel plate is used to ensure sufficient structural strength.

[0054] like Figures 2 to 4 As shown, the circuit breaker module 1 includes a circuit breaker main shaft 101, an arc extinguishing chamber bracket 102, an arc extinguishing chamber 103, and an isolating lower static contact knife 104. The circuit breaker main shaft 101 is located at the lower end of the circuit breaker module 1, and is mounted on the arc extinguishing chamber bracket 102. It is connected to the arc extinguishing chamber 103 internally and to the circuit breaker operating mechanism externally. It can be driven to rotate by the circuit breaker operating mechanism, and then drive the closing and opening of the break in the arc extinguishing chamber 103 to achieve the connection and disconnection of the circuit. The arc extinguishing chamber bracket 102 is located above the circuit breaker main shaft 101 and is fixed between the front mounting plate 6 and the rear mounting plate 5. The material is nylon plus glass fiber, which has sufficient strength and guaranteed insulation. The arc extinguishing chamber 103 is installed inside the arc extinguishing chamber bracket 102. The arc extinguishing chamber 103 is the core component for realizing the circuit breaking of the circuit breaker. An isolating lower static contact blade 104 is installed at the top of the arc extinguishing chamber 103, and the two are fixed by a hexagon socket round head screw, which can effectively optimize the local electric field and improve the partial discharge performance of the module.

[0055] The lower static contact blade 104 for isolation includes a first base 104-1 and a first contact blade 104-2, which are formed by integral forging to ensure the strength of the structure. A circular countersunk hole is provided on the first base 104-1, in which a hexagon socket flat round head screw can be placed so that it can be installed on the arc extinguishing chamber 103, and the screw head can be sunk into the circular countersunk hole and will not protrude outside the first base 104-1, thereby optimizing the electric field at the screw connection. In addition, the first base 104-1 is positioned on the raised structure of the arc extinguishing chamber bracket 102 to prevent the lower static contact blade 104 for isolation from rotating and deviating. The edge of the first contact blade 104-2 adopts a beveled chamfer transition design, and all edges are rounded to eliminate the corners, which can make it easier for the moving blade 203 to cut into the first contact blade 104-2 and reduce friction resistance. Two large-sized rounded corners are designed on both sides of the top of the first contact blade 104-2 to optimize the local electric field. The width of the top of the contact blade is greater than the width of the root, and the overall shape is convex. The size of each part has at least 3mm clearance from the rotation track of the isolation blade sleeve 202. While ensuring that the rotation of the isolation spindle module 2 does not interfere, the contact area of ​​the moving blade contact 203-1 on the isolation lower static contact blade 104 is increased to the maximum extent when the switch is closed. When the rotation angle of the isolation spindle module 2 is 58° to 62°, the moving blade contact 203-1 is pressed on the isolation lower static contact blade 104, and at least 4° of deviation is allowed. The contact stability of the product is guaranteed.

[0056] like Figures 8 to 10 As shown, the isolation static knife module 3 includes an isolation static knife holder 301, an isolation upper static contact knife 302, a copper rod 303, a first buffer pad 304, a second screw 305, and a second locking nut 306. The isolation static knife module 3 is located at the upper end of the entire double-break switch module, and is externally connected to the main busbar copper bar of the ring network cabinet. When the isolation spindle module 2 rotates 60° counterclockwise from the static position, the isolation switch is closed and the main circuit is turned on. The isolation static knife holder 301 is fixed on the front mounting plate 6 and the rear mounting plate 5. It is the supporting mechanism of the entire isolation static knife module 3. The material is nylon plus glass fiber, and there are multiple raised rectangular umbrella skirts on the surface, which can effectively increase the creepage distance between the isolation upper static contact knife 302. Three copper rods 303 are installed on the isolation static knife holder 301, and the copper rods 303 are fixed on the isolation static knife holder 301. An isolation upper static contact knife 302 is fixed at the lower end of each copper rod 303. The isolation upper static contact knife 302 includes a second base 302-1, a second contact blade 302-2, and a limit plate 302-3. It is formed by integral forging. A circular countersunk hole is provided on the second base 302-1, and a hexagon socket flat round head screw can be placed to install it on the copper rod 303. The screw head can sink into the circular countersunk hole and will not protrude outside the second base 302-1, thereby optimizing the electric field at the screw connection in the isolation upper static contact knife 302 area. The second base 302-1 is clamped on the raised structure of the isolation static knife holder 301 to prevent the isolation upper static contact knife 302 from rotating and deviating.

[0057] The edge of the second contact blade 302-2 adopts a beveled chamfer transition design, and all edges are rounded to eliminate the corners, which can make it easier for the moving knife 203 to cut into the second contact blade 302-2 and reduce friction resistance. Two large-sized rounded corners are designed on both sides of the top of the second contact blade 302-2 to optimize the local electric field. The second contact blade 302-2 is an irregular curved convex shape as a whole, and the size of each part has a gap of at least 3mm with the rotation trajectory of the isolation knife sleeve 202. While ensuring that the rotation of the isolation spindle module 2 does not interfere, the contact area of ​​the moving knife contact 203-1 on the isolation upper static contact knife 302 is maximized when the switch is closed, so that when the rotation angle of the isolation spindle module 2 is 58° to 62°, the moving knife contact 203-1 is pressed on the isolation upper static contact knife 302, and there is at least 4° of deviation allowed. The contact stability of the product is guaranteed. At the rear end of the second contact blade 302-2, a limit plate 302-3 structure is designed, which is perpendicular to the second base 302-1 and the second contact blade 302-2. The limit plate 302-3 is provided with two vertical holes on both sides of the second contact blade 302-2. On each side of the second contact blade 302-2, facing the direction in which the movable knife 203 swings when the switch is closed, two first buffer pads 304 are installed, which are fixed to the second contact blade 302-2 by the second screw 305 and the second locking nut 306. The second screw 305 is a hexagon socket countersunk screw. The structural material of the first buffer pad 304 is polyurethane, which has good impact resistance and energy absorption functions. The first buffer pad 304 is in the shape of a long strip, which can have more contact area with the isolation knife sleeve 202 and absorb more energy. After installation, its width direction does not exceed the second contact blade 302-2, saving redundant space. The first buffer pad 304 is provided with two countersunk through holes. When the second screw 305 is used for fixing, the screw head of the second screw 305 can be completely sunk into the first buffer pad 304, so that when the isolation spindle module 2 rotates to close, it directly hits the first buffer pad 304, thereby achieving more effective collision energy absorption.

[0058] When the isolation spindle module 2 rotates to realize isolation closing, the moving knife contact 203-1 will contact the isolation upper static contact knife 302 and the isolation lower static contact knife 104 at the same time. The rotation angle of the isolation spindle module 2 is designed to be 60° each time. However, after the first rotating shaft 201 drives the isolation spindle module 2 to rotate 60°, due to inertia, the isolation spindle module 2 will continue to rotate. If there is no limit plate 302-3 structure, the moving knife 203 is easy to swing out two static contact knives. If there is only a limit plate 3 02-3 structure, after the isolation knife sleeve 202 touches the limit plate 302-3, the entire isolation spindle module 2 will rotate back. If the contact pressure between the dynamic and static contact knives is small, the dynamic knife 203 will be thrown out of the static contact knife, resulting in poor contact. If the contact pressure is too large, the dynamic contact knife will be stuck after contacting the static contact knife. At this time, the dynamic knife contact 203-1 has not yet contacted the blade, resulting in poor contact, or when the switch is opened, the dynamic and static contact knives are stuck and cannot be separated. This case designs a double-layer first buffer pad 304 structure, which can collide with the first buffer pad 304 when the isolation knife sleeve 202 follows the isolation spindle module 2 to rotate 62°. At this time, the first buffer pad 304 absorbs energy and absorbs the impact energy caused by the rotation of the isolation spindle module 2, so that the isolation spindle module 2 loses most of the rebound potential energy and stops at about 60°, so that the moving knife contact 203-1 can be reliably stopped on the isolation upper static contact knife 302 and the isolation lower static contact knife 104, ensuring the reliability of the product. In addition, due to the irregular curved convex design of the contact blade ends of the isolation upper static contact knife 302 and the isolation lower static contact knife 104, the moving knife contact 203-1 can reliably contact the two contact blades when rotating 58° to 62° counterclockwise, improving the fault tolerance of the product. Since the upper static contact blade 302 of the isolation is designed with multiple stacked first buffer pads 304, it can fully absorb energy, and when the grounding is closed, it collides with the isolation blade cover 202 instead of the moving blade 203, which greatly protects the moving blade 203. The isolation blade cover 202 itself is a plastic part and has good plasticity. When the isolation is closed, the upper static contact blade 302 of the isolation collides with the first buffer pad 304, thereby protecting the upper static contact blade 302 of the isolation. It can achieve isolation closing and opening for 5,000 times without damage to the main components.

[0059] like Figures 11 to 13As shown, the grounding module 4 includes a grounding bracket 401, a grounding contact knife 402, a grounding copper busbar 403, a second buffer pad 404, a third screw 405, a fourth screw 406, a third locking nut 407, and a fourth locking nut 408. The grounding module 4 is located at the left end of the entire double-break switch module, and is externally connected to the environmental protection cabinet gas box. When the isolation spindle module 2 rotates 60° clockwise from the static position, the grounding switch is closed and the grounding circuit is turned on. The grounding bracket 401 is fixed to the front mounting plate 6 and the rear mounting plate 5 by bolts, and is the supporting mechanism of the entire grounding module 4. The material is stainless steel with a thickness of more than 5 mm to ensure structural strength. The grounding copper busbar 403 is located on the lower side of the grounding bracket 401, between the grounding bracket 401 and the grounding contact knife 402. The third screw 405 passes through the grounding contact blade 402, the grounding copper bar 403 and the grounding bracket 401 in sequence, and cooperates with the third locking nut 407 to fix the three grounding contact blades 402 and the grounding copper bar 403 on the grounding bracket 401. The end of the grounding copper bar 403 is bent and provided with a through hole, and the grounding copper bar 403 can be connected to the inner wall of the environmental protection cabinet gas box by screw connection, so as to realize the conduction of the grounding loop from the grounding module 4 to the environmental protection cabinet gas box.

[0060] The grounding contact blade 402 includes a third base 402-1 and a third contact blade 402-2, which are formed by integral forging. Two inverted circular countersunk holes are provided on the third base 402-1, which can be used to place the third screw 405. The third screw 405 is a hexagon socket countersunk screw, and the screw head can be sunk into the inverted circular countersunk hole and will not protrude outside the third base 402-1, thereby optimizing the electric field at the screw connection in the grounding contact blade 402 area. The third base 402-1 serves as a limiting structure when the moving blade 203 is impacted by closing the switch. Two circular through holes are also provided on the grounding contact blade 402, and the fourth screw 406 passes through the second buffer pad 404, the grounding contact blade 402, the grounding copper bar 403 and the grounding bracket 401 in sequence, and cooperates with the fourth locking nut 408 to fix the second buffer pad 404, the grounding contact blade 402 and the grounding copper bar 403 on the grounding bracket 401. The edge of the third contact blade 402-2 adopts a beveled chamfer transition design, and all edges are rounded to eliminate the corners, which can make it easier for the moving knife 203 to cut into the third contact blade 402-2 and reduce friction resistance. Two large-sized rounded corners are designed on both sides of the top of the third contact blade 402-2 to optimize the local electric field. The third contact blade 402-2 is an irregular curved convex shape as a whole, and the size of each part has a gap of at least 3mm with the rotation trajectory of the isolation knife sleeve 202. While ensuring that the rotation of the isolation spindle module 2 does not interfere, the contact area of ​​the moving knife contact 203-1 on the grounding contact blade 402 is maximized when the grounding switch is closed, so that when the rotation angle of the isolation spindle module 2 is 58° to 62°, the moving knife contact 203-1 is pressed on the grounding contact blade 402, and there is at least 4° of deviation allowed. The contact stability of the product is guaranteed. A second buffer pad 404 is fixed on the grounding contact blade 402, and the fourth screw 406 is a hexagon socket countersunk screw. The second buffer pad 404 is provided with two countersunk through holes. When the fourth screw 406 is used for fixing, the screw head of the fourth screw 406 can be completely sunk into the second buffer pad 404, so that when the isolation spindle module 2 rotates forward to close the switch, it directly touches the second buffer pad 404, thereby achieving more effective collision energy absorption. Next to the grounding contact blade 402, the copper tube fourth screw 406 fixes three superimposed second buffer pads 404. The horizontal height of the three superimposed second buffer pads 404 is consistent with the horizontal height of the second buffer pad 404 installed on the grounding contact blade 402, and is distributed on both sides of the third contact blade 402-2, so that when the grounding switch is closed, the two moving blades 203 touch the second buffer pad 404 at the same time. The structural material of the second buffer pad 404 is polyurethane, which has good impact resistance and energy absorption functions. The second buffer pad 404 is in the shape of a cube, which can have more contact area with the isolation blade sleeve 202 and absorb more energy.

[0061] When the isolation spindle module 2 rotates in the reverse direction to achieve grounding and closing, the moving knife contact 203-1 will contact the grounding contact knife 402 and the lower isolation static contact knife 104 at the same time. The rotation angle of the isolation spindle module 2 is designed to be 60° each time. However, after the first rotating shaft 201 drives the isolation spindle module 2 to rotate 60°, due to inertia, the isolation spindle module 2 will continue to rotate. If there is no third base 402-1 as a limiting structure, the moving knife 203 will easily swing out of the grounding contact knife 402 and the lower isolation static contact knife 104. If there is only the third base 402-1 structure, the isolation knife sleeve 202 will be in contact with the grounding contact knife 402 and the lower isolation static contact knife 104. , the entire isolation spindle module 2 will rotate backward. If the contact pressure between the moving knife 203 and the grounding contact knife 402 and the isolation lower static contact knife 104 is small, the moving knife 203 will be thrown out of the grounding contact knife 402 and the isolation lower static contact knife 104, resulting in poor contact. If the contact pressure is too large, the moving knife 203 will be stuck after contacting the grounding contact knife 402 and the isolation lower static contact knife 104. At this time, the moving knife contact 203-1 has not yet contacted the blade contact, resulting in poor contact, or when opening the switch, the moving knife 203 and the grounding contact knife 402 and the isolation lower static contact knife 104 are adhered and cannot be separated. In this case, a second buffer pad 404 structure is designed on both sides of the third contact blade 402-2. When the isolation blade sleeve 202 rotates 62° following the isolation spindle module 2, it can collide with the second buffer pad 404 around the grounding contact blade 402 at the same time. At this time, the second buffer pad 404 absorbs energy and absorbs the impact energy caused by the rotation of the isolation spindle module 2, so that the isolation spindle module 2 loses most of the rebound potential energy and makes the isolation spindle module 2 stay at about 60°, so that the moving blade contact 203-1 can be reliably stopped on the grounding contact blade 402 and the isolation lower static contact blade 104, ensuring the reliability of the product. In addition, due to the curved convex design of the contact blade ends of the grounding contact blade 402 and the isolation lower static contact blade 104, the moving blade contact 203-1 can reliably contact the two contact blades when rotating clockwise at 58° to 62°, which improves the fault tolerance of the product and ensures the reliability of the product when closing. Since multiple stacked second buffer pads 404 are designed near the grounding contact blade 402, they can fully absorb energy, and when the grounding switch is closed, it collides with the isolation blade cover 202 instead of the moving blade 203, which greatly protects the moving blade 203. The isolation blade cover 202 itself is a plastic part and has good plasticity. When the grounding switch is closed, it is the second buffer pad 404 that collides near the grounding contact blade 402, thereby protecting the grounding contact blade 402. It can achieve 5,000 grounding closing and opening times without damage to the main components.

[0062] By setting the buffer pad on the grounding contact blade 402 and the isolation static contact blade 302, the energy impact caused by the swing of the moving blade 203 can be effectively absorbed, and the stop position of the swing of the moving blade 203 can be accurately controlled so that it can stop reliably at a designed angle of about 60°, ensuring reliable contact between the moving blade and the static contact blade and the grounding contact blade 402. With the combined action of the buffer pad structure, the limit structure, and the contact pressure, the product can be made to be damageless for 5,000 times when isolating or grounding, greatly improving the service life of the product.

[0063] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A double-break switch module for an upper isolation environmental protection cabinet, characterized in that: include: A front mounting plate (6) and a rear mounting plate (5), wherein the front mounting plate (6) and the rear mounting plate (5) are arranged parallel to each other; A circuit breaker module (1), the circuit breaker module (1) being arranged between the front mounting plate (6) and the rear mounting plate (5), the upper end of the circuit breaker module (1) comprising an isolating lower static contact knife (104); An isolation static knife module (3), the isolation static knife module (3) being arranged between the front mounting plate (6) and the rear mounting plate (5), the lower end of the isolation static knife module (3) comprising an isolation upper static contact knife (302); A grounding module (4), the grounding module (4) being arranged between the front mounting plate (6) and the rear mounting plate (5), the grounding module (4) being externally connected to the environmental protection cabinet gas box, and the grounding module (4) comprising a grounding contact knife (402); An isolation spindle module (2), the isolation spindle module (2) comprising a first rotating shaft (201), the first rotating shaft (201) being arranged between the front mounting plate (6) and the rear mounting plate (5), three isolation knife sleeves (202) being arranged on the first rotating shaft (201) at equal intervals, two movable knives (203) being arranged in each of the isolation knife sleeves (202), the movable knives (203) being fixedly connected to the isolation knife sleeves (202) by three nylon pins (207), a first screw (209) passing through both ends of the movable knives (203), and the first screw (209) being tightened by a first locking nut (210), a shaft sleeve (211) being sleeved on the first screw (209), the shaft sleeve (211) being located between two adjacent movable knives (203), the first screw A compression spring (208) is sleeved on the screw head of the nail (209), and two protruding moving knife contacts (203-1) are respectively arranged at both ends of the moving knife (203). The first rotating shaft (201) is rotated to make the moving knife (203) contact and separate with the corresponding contact knife. One end of the moving knife (203) moves between the grounding contact knife (402) and the lower isolated static contact knife (104), and the other end of the moving knife (203) moves between the lower isolated static contact knife (104) and the upper isolated static contact knife (302). When the moving knife (203) is combined with the corresponding contact knife, the two moving knife contacts (203-1) contact with the corresponding contact knife. The thickness of the corresponding contact knife is slightly thicker than the length of the shaft sleeve (211). Under the action of the compression spring (208), the two moving knives (203) are pressed on the contact knife.

2. The double-break switch module of the upper isolation environmental protection cabinet according to claim 1 is characterized in that: The circuit breaker module (1) comprises: An arc extinguishing chamber support (102), the arc extinguishing chamber support (102) being fixed between the front mounting plate (6) and the rear mounting plate (5), an arc extinguishing chamber (103) being arranged in the arc extinguishing chamber support (102), and the lower isolating static contact knife (104) being arranged at the top end of the arc extinguishing chamber (103); A circuit breaker main shaft (101), the circuit breaker main shaft (101) is mounted on the arc extinguishing chamber bracket (102), the circuit breaker main shaft (101) is connected to the arc extinguishing chamber (103), and the rotation of the circuit breaker main shaft (101) can drive the closing and opening of the break in the arc extinguishing chamber (103).

3. The double-break switch module of the upper isolation environmental protection cabinet according to claim 2 is characterized in that: The isolating lower static contact blade (104) comprises a first base (104-1) and a first contact blade (104-2); the first base (104-1) is fixed on the arc extinguishing chamber bracket (102); and the first contact blade (104-2) is integrally formed on the first base (104-1).

4. The double-break switch module of the upper isolation environmental protection cabinet according to claim 1, characterized in that: The front end of the first rotating shaft (201) is sleeved with a dynamic sealing flange (204), the dynamic sealing flange (204) is connected to an isolation operating mechanism outside the environmental protection cabinet gas box, and the first rotating shaft (201) is driven to rotate through the operating mechanism. The first rotating shaft (201) is provided with an insulating shed (205) sleeve, the insulating shed (205) sleeve is located behind the first rotating shaft (201), and the three isolation knife sleeves (202) are all located behind the insulating shed (205) sleeve. An insulating sleeve (206) is provided at one end of the first rotating shaft (201) close to the rear mounting plate (5).

5. The double-break switch module of the upper isolation environmental protection cabinet according to claim 1, characterized in that: The isolation static knife module (3) comprises an isolation static knife frame (301), the isolation static knife frame (301) is fixed between the front mounting plate (6) and the rear mounting plate (5), a plurality of raised rectangular umbrella skirts are arranged on the isolation static knife frame (301), three copper rods (303) are equidistantly arranged on the isolation static knife frame (301), and the isolation upper static contact knife (302) is fixed to the lower end of the copper rod (303).

6. The double-break switch module of the upper isolation environmental protection cabinet according to claim 5, characterized in that: The isolated upper static touch knife (302) comprises a second base (302-1), a second touch blade (302-2) and a limit plate (302-3); the second base (302-1) is fixed on the isolated static knife module (3); the second touch blade (302-2) and the limit plate (302-3) are integrally formed on the second base (302-1); the limit plate (302-3) is perpendicular to the second touch blade (302-2); the limit plate (302-3) is used to prevent the movable knife (203) from excessively rotating and swinging out of the second touch blade (302-2).

7. The double-break switch module of the upper isolation environmental protection cabinet according to claim 6, characterized in that: A first buffer pad (304) is provided on the limiting piece (302-3).

8. The double-break switch module of the upper isolation environmental protection cabinet according to claim 1, characterized in that: The grounding module (4) comprises a grounding bracket (401), the grounding bracket (401) is fixed between the front mounting plate (6) and the rear mounting plate (5), a grounding copper bar (403) is arranged on the grounding bracket (401), and the grounding contact knife (402) is fixed to the lower end of the grounding copper bar (403).

9. The double-break switch module of the upper isolation environmental protection cabinet according to claim 8, characterized in that: The grounding contact blade (402) comprises a third base (402-1) and a third contact blade (402-2); the third base (402-1) is fixed on the grounding copper busbar (403); the third contact blade (402-2) is integrally formed on the third base (402-1); and the third base (402-1) is used to prevent the movable blade (203) from excessively rotating and swinging out the third contact blade (402-2).

10. The double-break switch module of the upper isolation environmental protection cabinet according to claim 9, characterized in that: A second buffer pad (404) is arranged on the third base (402-1).

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