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

Abstract

The utility model discloses a double-break switch module of an upper isolation environment-friendly cabinet, which belongs to the technical field of ring main units and comprises an irregular curve convex isolation upper static contact knife, an isolation lower static contact knife and a grounding contact knife. 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 utility model relates to the technical field of ring network cabinets, in particular to a double-break switch module of an upper isolation environmental protection cabinet. Background Art

[0002] Currently, the existing ring main unit (RMU) mainly includes gas-insulated RMU and solid-insulated RMU. With the need for transformation in the power industry, environmental protection cabinets among gas-insulated RMUs are widely used due to their excellent insulation performance, environmental friendliness, and pollution-free nature. Environmental protection cabinets generally use dry air or nitrogen as the gas insulation medium. Compared with traditional SF6 gas insulation, they require 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 RMU will be larger, increasing the floor space of the cabinet and affecting the cost of use. When closing, the isolating movable knife of the existing switch module is prone to over-closing or under-closing, both of which will lead to poor contact at the contact part, causing heat, and thus greatly endangering the normal operation of the RMU. The double-break switch module, because its movable knife needs to close two static knives and one ground knife, is more likely to have poor closing contact and is more likely to cause poor closing contact. Utility Model Content

[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] According to the embodiment of the utility model, the double-break switch module of the upper isolation environmental protection cabinet includes: 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 includes 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 includes 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 includes a grounding contact knife; an isolation main shaft module, the isolation main shaft module includes 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 evenly spaced on the first rotating shaft. Two movable knives are provided in each isolation knife sleeve, and the movable knife and the isolation knife sleeve are fixedly connected by three nylon pins, which pass through the two ends of the movable knife through the first screw and are tightened by the first locking nut. A shaft sleeve is sleeved on the first screw, and the shaft sleeve is located between the two adjacent movable knives. A compression spring is sleeved on the screw head of the first screw, and two raised movable knife contacts are respectively provided at both ends of the movable knife. The first rotating shaft is rotated to make the movable knife contact and separate with the corresponding contact knife. One end of the movable knife moves between the grounding contact knife and the lower isolation static contact knife, and the other end of the movable knife moves between the lower isolation static contact knife and the upper isolation static contact knife. When the movable knife is closed into the corresponding contact knife, the two movable knife contacts 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 movable knives are pressed on the contact knife.

[0005] The double-break switch module for the upper isolation environmental protection cabinet according to the embodiment of the utility model has at least the following beneficial effects: the use of an irregular curved convex shape to isolate the upper static contact blade, the lower static contact blade, and the grounding contact blade, while ensuring clearance for component movement, increases the contact area between the moving blade contact and the contact blade, allowing reliable contact between the contact blades when rotated 58° to 62°, thereby increasing the product's fault tolerance and reliability. While the overall size of the ring network cabinet is relatively small, it can ensure sufficient electrical clearance between the switch blades, thereby improving the product's insulation capacity.

[0006] According to some embodiments of the present invention, the circuit breaker module includes: an arc extinguishing chamber bracket, which is fixed between the front mounting plate and the rear mounting plate, an arc extinguishing chamber is arranged in the arc extinguishing chamber bracket, and the lower isolating static contact knife is arranged at the top of the arc extinguishing chamber; a circuit breaker main shaft, which 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 fracture 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 utility model, the front end of first pivot is equipped with dynamic sealing flange plate, dynamic sealing flange plate is connected with the isolation operating mechanism outside the environmental protection cabinet gas tank, and first pivot is driven to rotate through operating mechanism, insulating umbrella skirt sleeve is arranged on first pivot, insulating umbrella skirt sleeve is located behind first pivot, three isolation knife sheaths are all located behind insulating umbrella skirt sleeve, and one end of first pivot close to rear mounting plate is provided with insulating sleeve.

[0009] According to some embodiments of the utility model, the isolation static knife module comprises an isolation static knife frame, the isolation static knife frame is fixed between the front mounting plate and the rear mounting plate, a plurality of protruding rectangular umbrella skirts are arranged on the isolation static knife frame, three copper bars are arranged on the isolation static knife frame at equal intervals, and an isolation upper static contact knife is fixed at the lower end of the copper bar.

[0010] According to some embodiments of the utility model, the isolation upper static contact knife comprises a second base, a second contact blade and a limiting piece, the second base is fixed on the isolation static knife module, the second contact blade and the limiting piece are integrally formed on the second base, the limiting piece is perpendicular to the second contact blade, and the limiting piece is used for preventing the dynamic knife from excessively rotating and swinging out of the second contact blade.

[0011] According to some embodiments of the utility model, a first buffer pad is arranged on the limiting piece.

[0012] According to some embodiments of the utility model, the grounding module comprises a grounding support, the grounding support is fixed between the front mounting plate and the rear mounting plate, a grounding copper bar is arranged on the grounding support, and a grounding contact knife is fixed at the lower end of the grounding copper bar.

[0013] According to some embodiments of the utility model, the grounding contact knife comprises a third base and a third contact blade, the third base is fixed on the grounding copper bar, and the third contact blade is integrally formed on the third base, and the third base is used for preventing the dynamic knife from excessively rotating and swinging out of the third contact blade.

[0014] According to some embodiments of the utility model, a second buffer pad is arranged on the third base.

[0015] Additional aspects and advantages of the utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model is further explained in connection with the drawings and embodiments as follows:

[0017] Figure 1 It is the structure schematic diagram of the double-break switch module of the upper isolation environmental protection cabinet of the utility model embodiment;

[0018] Figure 2 It is Figure 1 The structure schematic 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 Schematic diagram of the structure 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 Schematic diagram of the structure of the central isolation static knife module;

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

[0026] Figure 10 yes Figure 8 Schematic diagram of the structure of the static contact knife on the middle isolation from another perspective;

[0027] Figure 11 yes Figure 1 Schematic diagram of the structure of the grounding module;

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

[0029] Figure 13 yes Figure 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] First base 104-1; first contact blade 104-2;

[0034] First rotating shaft 201; Isolation knife set 202; Moving knife 203; Moving sealing flange 204; Insulating umbrella skirt 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 bar 303; First buffer pad 304; Second screw 305;

[0038] Second locking nut 306;

[0039] Second base 302-1; Second contact blade 302-2; Limiting piece 302-3;

[0040] Grounding bracket 401; Grounding contact knife 402; Grounding copper bar 403; Second buffer pad 404; Third screw 405; Fourth screw 406;

[0041] Third locking nut 407; Fourth locking nut 408;

[0042] Third base 402-1; Third contact blade 402-2. DETAILED DESCRIPTION

[0043] This part will describe the specific embodiments of the utility model in detail, the preferred embodiments of the utility model are shown in the drawings, the role of the drawings is to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the utility model, but it cannot be understood as the limitation of the protection scope of the utility model.

[0044] In the description of the utility model, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc., is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and it is not indicated or implied that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore it cannot be understood as the limitation of the utility model.

[0045] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are not included in the number, above, below, etc. are understood as including the number.If it is described to the first, the second is only used for distinguishing technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0046] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting 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 The double-break switch module of the upper isolation environmental protection cabinet according to the embodiment of the present utility model 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 is tightened by the first locking nut 210 through the two ends of the movable knife 203. The first screw 209 is covered with a shaft sleeve 211, and the shaft sleeve 211 is located between the two adjacent movable knives 203. The screw head of the first screw 209 is covered with a compression spring 208. Two protruding movable knife contacts 203-1 are respectively provided 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 grounding 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 movable blades 203 are mounted within the isolation blade housing 202. The movable blades 203 are fixedly connected to the isolation blade housing 202 via three nylon pins 207. A first screw 209 passes through each end of the movable blade 203 and is tightened by a first locking nut 210. A sleeve 211 is positioned between the two movable blades 203 to prevent them from merging. A compression spring 208 is mounted on the head of the first screw 209 to firmly press the two movable blades 203 against the sleeve 211. Two raised movable blade contacts 203-1 are designed at each end of the movable blade 203. When the movable blade 203 rotates, such as when it engages the lower isolation static contact blade 104, the two movable blade contacts 203-1 contact the first contact blade 104-2. This contact ensures reliable contact while preventing adhesion between the contact blades, which could prevent them from separating during tripping. 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 blades 203 are only pressed on the isolated lower static contact blade 104, and the contact pressure between the contact blades is about 230N~250N, which ensures the contact reliability between the contact blades and prevents adhesion between the contact blades.

[0050] The first rotating shaft 201 is constructed of epoxy resin and fiberglass, ensuring structural strength and insulation. A dynamic sealing flange 204 is mounted on the top of the first rotating shaft 201, which is connected to the isolation operating mechanism outside the environmental protection cabinet's gas box. This operating mechanism drives the first rotating shaft 201, and thus the entire isolation spindle module 2, to rotate. The default static position is the isolation blade 203 in the open position. At this point, the electrical clearance between the fracture and ground exceeds 135mm, improving the product's insulation performance. From the static position, the isolation spindle module 2 rotates 60° counterclockwise to the isolation-closed state, and 60° clockwise from the static position to the grounded-closed state.

[0051] An insulating shed 205 is mounted on the first rotating shaft 201 and is located at the rear end of the dynamic sealing flange 204. Made of nylon and fiberglass, it increases the insulation distance between the moving blade 203 and the dynamic sealing flange 204, thereby improving the product's insulation capabilities. Three isolation blade sleeves 202 are installed behind the insulating shed 205, mounted on the first rotating shaft 201. The isolation blade sleeves 202 protect the moving blades 203 and increase the insulation distance between the moving blades 203. An insulating sleeve 206 is installed at the rear end of the isolation blade sleeves 202. The other end of the insulating sleeve 206 is a rear mounting plate 5, which is used to hold the three isolation blade sleeves 202 in place, preventing them from sliding on the first rotating shaft 201. This allows the moving blades 203 to align and close into the static contact blade or grounding contact blade 402 when the switch is closed.

[0052] The double-break switch module of the environmental protection cabinet can ensure that the electrical gap between the knife gap is more than 135mm when the width of the environmental protection cabinet is 420mm, greatly improving the insulation capacity of the product. The irregular curve convex isolation upper static contact knife 302, the isolation lower static contact knife 104 and the grounding contact knife 402 scheme is adopted, which can ensure the gap of the component movement while making the movable knife contact point 203-1 and the contactable area of the contact knife larger, so that the contact knives can be reliably contacted when rotating 58°-62°, increasing the fault tolerance of the product and improving the reliability of the product.

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

[0054] As shown in Figures 2 to 4 The circuit breaker module 1 includes a circuit breaker main shaft 101, an arc extinguishing chamber support 102, an arc extinguishing chamber 103 and an isolation lower static contact knife 104. The circuit breaker main shaft 101 is located at the lower end of the circuit breaker module 1, is installed on the arc extinguishing chamber support 102, is connected with the arc extinguishing chamber 103 inside, is connected with the circuit breaker operating mechanism outside, can be driven to rotate by the circuit breaker operating mechanism, and then drives the closing and opening of the break in the arc extinguishing chamber 103, so as to realize the connection and disconnection of the circuit. The arc extinguishing chamber support 102 is located above the circuit breaker main shaft 101, is fixed between the front mounting plate 6 and the rear mounting plate 5, and is made of nylon plus glass fiber, which has sufficient strength and ensures insulation. The arc extinguishing chamber support 102 is internally provided with the arc extinguishing chamber 103, and the arc extinguishing chamber 103 is a core component for realizing the opening and closing of the circuit breaker circuit. The arc extinguishing chamber 103 is provided with the isolation lower static contact knife 104 at the top end, and the two are fixed by the internal hexagonal flat 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 104 of the isolation is composed of a first base 104-1 and a first contact blade 104-2, which are integrally forged to ensure the strength of the structure. The first base 104-1 is provided with a circular counterbore, which can accommodate a hexagonal flat round head screw, so that the screw is installed on the arc extinguishing chamber 103, and the screw head can be sunk into the circular counterbore and will not protrude outside the first base 104-1, thereby optimizing the electric field at the screw connection. The first base 104-1 is clamped on the protruding structure of the arc extinguishing chamber support 102 to prevent the lower static contact 104 of the isolation from rotating and deviating. The edge of the first contact blade 104-2 is designed with a bevel chamfer transition, and all edges are rounded to eliminate the edges, which can make the moving contact 203 more easily cut into the first contact blade 104-2 and reduce the friction resistance. Two large-size rounded corners are designed on both sides of the top end of the first contact blade 104-2 to optimize the local electric field. The width of the top end of the contact blade is greater than the width of the root, and the whole is convex, and the size of each part has a gap of at least 3 mm from the rotating track of the isolation contact sleeve 202, which can maximize the contact area of the moving contact 203-1 on the lower static contact 104 of the isolation during closing, so that the moving contact 203-1 can be uniformly pressed on the lower static contact 104 of the isolation when the isolation main shaft module 2 rotates at an angle of 58°-62°, and there is at least a 4° deviation allowance. The contact stability of the product is ensured.

[0056] As shown in Figures 8 to 10 The isolation static contact module 3 includes an isolation static contact holder 301, an upper static contact 302, a copper bar 303, a first buffer pad 304, a second screw 305, and a second locking nut 306. The isolation static contact module 3 is located at the upper end of the entire double-break switch module, is connected to the main bus copper bar of the ring main unit outside, and is connected to the main circuit inside when the isolation main shaft module 2 is rotated counterclockwise by 60° from the static position, so that the isolation switch is closed and the main circuit is conducted. The isolation static contact holder 301 is fixed on the front mounting plate 6 and the rear mounting plate 5, is a supporting mechanism of the entire isolation static contact module 3, is made of nylon reinforced with glass fiber, and has a plurality of protruding rectangular umbrella skirts on the surface, which can effectively improve the creepage distance between the upper static contacts 302. The isolation static contact holder 301 is provided with three copper bars 303, which are clamped and fixed on the isolation static contact holder 301. The lower end of each copper bar 303 is fixed with an upper static contact 302. The upper static contact 302 includes a second base 302-1, a second contact blade 302-2, and a limiting piece 302-3, which are integrally forged. The second base 302-1 is provided with a circular counterbore, which can accommodate a hexagonal flat round head screw, so that the screw is installed on the copper bar 303, and the screw head can be sunk into the circular counterbore and will not protrude outside the second base 302-1, thereby optimizing the electric field at the screw connection in the area of the upper static contact 302. The second base 302-1 is clamped on the protruding structure of the isolation static contact holder 301 to prevent the upper static contact 302 from rotating and deviating.

[0057] The edges of the second contact blade 302-2 feature a chamfered transition design, and all edges are rounded to eliminate friction. This allows the movable blade 203 to more easily cut into the second contact blade 302-2, reducing frictional resistance. Two large rounded corners are designed on either side of the top of the second contact blade 302-2 to optimize the local electric field. The second contact blade 302-2 has an overall irregular, curved, convex shape. Each component has a minimum clearance of 3mm from the rotational trajectory of the isolation blade housing 202. This ensures that the rotation of the isolation spindle module 2 does not interfere with the rotation, while maximizing the contact area between the movable blade contact 203-1 and the upper static contact blade 302 during closing. This ensures that when the isolation spindle module 2 rotates between 58° and 62°, the movable blade contact 203-1 presses uniformly against the upper static contact blade 302, with a tolerance of at least 4°. This ensures product contact stability. 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 a second screw 305 and a 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 does not exceed the second contact blade 302-2, saving redundant space. Two countersunk through holes are provided on the first buffer pad 304. When fixed with the second screw 305, 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 main shaft module 2 rotates to realize isolation closing, the moving knife contact 203-1 will be in contact with 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 main shaft module 2 is designed to be 60° each time, but after the first rotating shaft 201 drives the isolation main shaft module 2 to rotate 60°, the isolation main shaft module 2 will continue to rotate due to inertia. If there is no limiting piece 302-3 structure, the moving knife 203 is easy to swing out of the two static contact knives. If there is only the limiting piece 302-3 structure, after the isolation knife sleeve 202 collides with the limiting piece 302-3, the entire isolation main shaft module 2 will rotate back. If the contact pressure between the moving and static contact knives is small, the moving knife 203 will be thrown out of the static contact knife, resulting in poor contact. If the contact pressure is too large, the moving contact knife will be stuck after contacting the static contact knife. At this time, the moving knife contact 203-1 has not yet contacted the contact piece, thereby causing poor contact, or during opening, the moving and static contact knives are stuck together and cannot be separated. The double-layer first buffer pad 304 structure is designed in the case. When the isolation knife sleeve 202 rotates 62° with the isolation main shaft module 2, it collides with the first buffer pad 304. At this time, the first buffer pad 304 absorbs energy, absorbs the impact energy brought by the rotation of the isolation main shaft module 2, so that the isolation main shaft module 2 loses most of the rebound potential energy, and the isolation main shaft module 2 stays 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. And due to the irregular curve convex design of the end of the contact piece 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 pieces when rotating counterclockwise by 58°-62°, thereby improving the fault tolerance of the product. Since the isolation upper static contact knife 302 is designed with multiple stacked first buffer pads 304, the energy is fully absorbed, and the isolation knife sleeve 202 collides instead of the moving knife 203 when the ground is closed, which greatly protects the moving knife 203. The isolation knife sleeve 202 is a plastic part itself and has good plasticity. The isolation upper static contact knife 302 collides with the first buffer pad 304 during isolation closing, thereby also protecting the isolation upper static contact knife 302. The main components are not damaged when the isolation closing and opening are performed five thousand times.

[0059] As Figures 11 to 13As shown, the grounding module 4 includes a grounding bracket 401, a grounding contact blade 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. It 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 connected. The grounding bracket 401 is fixed to the front mounting plate 6 and the rear mounting plate 5 by bolts. It is the support 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 blade 402. A third screw 405 sequentially passes through the grounding contact blade 402, the grounding copper bar 403, and the grounding bracket 401, and cooperates with a third locking nut 407 to secure the three grounding contacts 402 and the grounding copper bar 403 to the grounding bracket 401. The end of the grounding copper bar 403 is bent and has a through hole. The grounding copper bar 403 can be connected to the inner wall of the environmental protection cabinet gas box via screws, ensuring continuity of the grounding circuit from the grounding module 4 to the environmental protection cabinet gas box.

[0060] The grounding contact blade 402 comprises a third base 402-1 and a third contact blade 402-2, formed by integral forging. The third base 402-1 has two chamfered countersunk holes for receiving third screws 405. These screws are hexagon socket countersunk screws, with their heads recessed into the chamfered holes and not protruding beyond the third base 402-1. This optimizes the electric field at the screw connection in the area of ​​the grounding contact blade 402. The third base 402-1 acts as a retaining structure during the closing impact of the movable blade 203. Two more circular through-holes are provided in the grounding contact blade 402. A fourth screw 406 passes through the second buffer pad 404, the grounding contact blade 402, the grounding copper busbar 403, and the grounding bracket 401. The fourth screw 406, in conjunction with a fourth locking nut 408, secures the second buffer pad 404, the grounding contact blade 402, and the grounding copper busbar 403 to the grounding bracket 401. The edges of the third contact blade 402-2 feature a chamfered transition design, and all edges are rounded to eliminate friction. This allows the movable blade 203 to more easily cut into the third contact blade 402-2, reducing frictional resistance. Two large rounded corners are designed on either side of the top of the third contact blade 402-2 to optimize the local electric field. The third contact blade 402-2 has an overall irregular, convex shape. Each component has a minimum clearance of 3mm from the rotational trajectory of the isolation blade housing 202. This ensures that the isolation spindle module 2 does not interfere with its rotation while maximizing the contact area of ​​the movable blade contact 203-1 on the grounding contact 402 during grounding. This ensures that the movable blade contact 203-1 remains pressed against the grounding contact 402 evenly when the isolation spindle module 2 rotates between 58° and 62°, with a tolerance of at least 4°. This ensures product contact stability. A second buffer pad 404 is secured to the grounding contact blade 402. The fourth screw 406 is a hexagon socket countersunk screw with two countersunk through-holes in the second buffer pad 404. When secured with the fourth screw 406, the screw head of the fourth screw 406 fully sinks into the second buffer pad 404, allowing the isolated spindle module 2 to directly contact the second buffer pad 404 during forward rotation, achieving more effective collision energy absorption. Next to the grounding contact blade 402, three stacked second buffer pads 404 are secured to the copper tube fourth screw 406. These stacked second buffer pads 404 are aligned with the second buffer pad 404 mounted on the grounding contact blade 402 and are located on either side of the third contact blade 402-2. This ensures that both movable blades 203 simultaneously contact the second buffer pads 404 during grounding. The second buffer pads 404 are constructed of polyurethane, which offers excellent impact resistance and energy absorption. Their cube shape provides a larger contact area with the isolation blade housing 202, absorbing more energy.

[0061] When the isolation spindle module 2 is reversed to realize grounding closing, the moving knife contact 203-1 will be in contact with the grounding contact knife 402 and the isolation lower static contact 104 at the same time. The rotation angle of the isolation spindle module 2 is designed to be 60° each time, but after the first rotating shaft 201 drives the isolation spindle module 2 to rotate 60°, the isolation spindle module 2 will continue to rotate due to inertia. If there is no third base 402-1 as a limiting structure, the moving knife 203 is easy to swing out of the grounding contact knife 402 and the isolation lower static contact 104. If there is only the third base 402-1 structure, the isolation knife sleeve 202 will make the entire isolation spindle module 2 rotate back after being touched. If the contact pressure between the moving knife 203 and the grounding contact knife 402 and the isolation lower static contact 104 is small, the moving knife 203 will be thrown out of the grounding contact knife 402 and the isolation lower static contact 104, resulting in poor contact. If the contact pressure is too large, the moving contact knife will be stuck after being in contact with the grounding contact knife 402 and the isolation lower static contact 104. At this time, the moving knife contact 203-1 has not been in contact with the contact blade, resulting in poor contact. Or when the switch is opened, the moving knife 203 is stuck to the grounding contact knife 402 and the isolation lower static contact 104 and cannot be separated. The second buffer pad 404 structure is designed on both sides of the third contact blade 402-2. When the isolation knife sleeve 202 rotates 62° with the isolation spindle module 2, it will collide with the second buffer pad 404 around the grounding contact knife 402 at the same time. At this time, the second buffer pad 404 absorbs the impact energy brought by the rotation of the isolation spindle module 2, so that the isolation spindle module 2 loses most of the rebound potential energy, and the isolation spindle module 2 stays at about 60°, so that the moving knife contact 203-1 can be reliably stopped on the grounding contact knife 402 and the isolation lower static contact 104, ensuring the reliability of the product. And because of the curve convex design of the end of the contact blade of the grounding contact knife 402 and the isolation lower static contact 104, the moving knife contact 203-1 can reliably contact the two contact blades when rotating clockwise at 58°-62°, improving the fault tolerance of the product and ensuring the reliability of the product when closing. Because multiple stacked second buffer pads 404 are designed near the grounding contact knife 402, the energy is fully absorbed, and the isolation knife sleeve 202 collides instead of the moving knife 203 when grounding, which greatly protects the moving knife 203. The isolation knife sleeve 202 is a plastic part itself and has good plasticity. The second buffer pad 404 near the grounding contact knife 402 collides when grounding, thereby protecting the grounding contact knife 402. The main components are not damaged when grounding and opening five thousand times.

[0062] The cushioning pads on the grounding contact blade 402 and the isolation-mounted static contact blade 302 effectively absorb the energy impact caused by the swinging of the movable blade 203. The swinging stop position of the movable blade 203 can be accurately controlled, ensuring reliable stopping at a designed angle of approximately 60°, ensuring reliable contact between the movable blade, the static contact blade, and the grounding contact blade 402. The combined effect of the cushioning pad structure, the position limiting mechanism, and the contact pressure ensures that the product can withstand 5,000 cycles of isolation and grounding closing and opening without damage, greatly extending its service life.

[0063] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge 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) including a grounding contact knife (402); An isolation spindle module (2), the isolation spindle module (2) includes a first rotating shaft (201), the first rotating shaft (201) is arranged between the front mounting plate (6) and the rear mounting plate (5), three isolation knife sleeves (202) are arranged on the first rotating shaft (201) at equal intervals, each isolation knife sleeve (202) is provided with two movable knives (203), the movable knives (203) and the isolation knife sleeve (202) are fixedly connected by three nylon pins (207), a first screw (209) passes through the two ends of the movable knife (203), and the first screw (209) is tightened by a 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), and the first screw A compression spring (208) is sleeved on the screw head of the nail (209), and two protruding movable knife contacts (203-1) are respectively provided 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 combined with 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.

2. The double-break switch module of the upper isolation environmental protection cabinet according to claim 1, characterized in that: The circuit breaker module (1) comprises: An arc extinguishing chamber bracket (102), the arc extinguishing chamber bracket (102) being fixed between the front mounting plate (6) and the rear mounting plate (5), an arc extinguishing chamber (103) being provided in the arc extinguishing chamber bracket (102), and the isolating lower static contact knife (104) being provided at the top end of the arc extinguishing chamber (103); A 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 rotating the circuit breaker main shaft (101) can drive the opening and closing 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, 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 covered with a dynamic sealing flange (204), and 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 by the operating mechanism. The first rotating shaft (201) is provided with an insulating umbrella skirt (205) sleeve, and the insulating umbrella skirt (205) sleeve is located behind the first rotating shaft (201). The three isolation knife sleeves (202) are all located behind the insulating umbrella skirt (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 provided on the isolation static knife frame (301), three copper rods (303) are provided on the isolation static knife frame (301) at equal intervals, 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 contact knife (302) comprises a second base (302-1), a second contact blade (302-2) and a limiting plate (302-3); the second base (302-1) is fixed on the isolated static knife module (3); the second contact blade (302-2) and the limiting plate (302-3) are integrally formed on the second base (302-1); the limiting plate (302-3) is perpendicular to the second contact blade (302-2); and the limiting plate (302-3) is used to prevent the movable knife (203) from excessively rotating and swinging out of the second contact 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 provided on the grounding bracket (401), and the grounding contact blade (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), wherein the third base (402-1) is fixed on the grounding copper busbar (403), and 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 provided on the third base (402-1).

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