High-voltage switchgear with hot channel isolation

Abstract

This invention discloses a high-voltage switchgear with a thermal channel isolation structure, relating to the field of switchgear technology. It includes: a cabinet, a cable tray fixed to the inner wall of the cabinet, and heating and control elements detachably installed inside the cabinet. This device uses a horizontally arranged heat insulation plate to divide the vertical space inside the cabinet into an upper sensitive element chamber and a lower main heating element chamber, blocking the unorganized upward diffusion of hot air generated by the heating elements and preventing the formation of localized hot spots in the instrument or cable chamber. Furthermore, elastic rollers are installed on both sides of the upper surface of the heat insulation plate. The rollers are pressed against the plate surface by compression springs. When the heat insulation plate warps slightly upwards at both ends due to long-term temperature differences, the rollers can deflect upwards in the direction of warping, neither forcibly restricting deformation and causing the plate edges to crack, nor altering the relative movement between the plate edges and the rollers from sliding friction to rolling friction.

Description

Technical Field

[0001] This invention relates to the field of switchgear technology, and more specifically to a high-voltage switchgear assembly with a thermal channel isolation structure. Background Technology

[0002] High-voltage switchgear is an integrated device used for power distribution, circuit control and protection in a power system. It contains major heat-generating components such as circuit breakers, contactors, main busbars, and copper busbar connection points.

[0003] During equipment operation, the aforementioned components generate a significant amount of heat. If this heat cannot be effectively dissipated, the temperature inside the cabinet will rise, affecting the reliability and lifespan of the electronic components. Existing switchgear typically relies on the cabinet's own ventilation holes or exhaust fans for cooling. However, in this way, heat diffuses unorganized within the cabinet, easily forming localized hotspots in the instrument room or cable room, making it difficult to achieve centralized heat removal and directional isolation.

[0004] Secondly, some switchgear manufacturers have attempted to install heat insulation panels inside the cabinet to physically isolate the heating element chamber from the sensitive element chamber, thus preventing the disorderly transfer of hot air to the sensitive area. However, in practical applications, it has been found that the heat insulation panel is constantly in a non-uniform temperature field where one side is heated while the other side is close to room temperature, resulting in a persistent temperature difference between the upper and lower surfaces. After years of use, this long-term uneven heating and cooling condition causes thermal stress to form inside the heat insulation panel, leading to irreversible warping deformation at both ends towards the sensitive element chamber. A wedge-shaped gap forms between the bottom of the warped heat insulation panel and the supporting structure, allowing hot air to seep into the sensitive element chamber and weakening the original thermal insulation effect.

[0005] In summary, there is a need to develop a high-voltage switchgear with a thermal aisle isolation structure to solve the above problems. Summary of the Invention

[0006] To solve the above-mentioned technical problems, the present invention provides a high-voltage switchgear with a thermal aisle isolation structure, comprising: a cabinet, a wiring plate fixed to the inner wall of the cabinet, and a heating element and a control element detachably installed inside the cabinet, and further comprising a heat insulation plate that isolates the heating element and the control element vertically. Stepped support members are respectively extended from the two symmetrical side walls of the cabinet, and sealing strips are embedded inside the stepped support members. The heat insulation plate is placed on the upper side of the stepped support members and abuts against the upper surface of the sealing strip. The invention also includes anti-tilting components symmetrically arranged at the two edges of the upper surface of the heat insulation plate. The anti-tilting components include a fixed shaft fixed to the inner side of the stepped support members and extending horizontally, and a clamping roller installed in cooperation with the fixed shaft. At least two sets of clamping rollers are arranged side-by-side along the extension direction of the cabinet side walls. The heat insulation board is horizontally installed inside the cabinet, dividing its vertical space into an upper sensitive element chamber and a lower main heating element chamber to form a thermal channel isolation. The heat insulation board is made of SMC composite material, which has high temperature resistance, excellent heat insulation performance and mechanical strength. The rollers are lightweight and wear-resistant rollers to avoid surface wear and powder generation caused by sliding friction. The sealing strip is used to elastically fill the gap between the bottom surface of the heat insulation board and the stepped support when the heat insulation board warps. The sealing strip is a solid silicone strip with high temperature resistance, wear resistance and anti-aging properties. The upper surface of the sealing strip is not higher than the support surface of the stepped support, so it will not support the heat insulation board in the initial stage, causing the bottom of the heat insulation board to exceed the wiring plate and form a gap.

[0007] Furthermore, the two ends of the wire threading plate abut against the outer surfaces of the stepped support members on both sides. The length of the stepped support member extending along the side wall of the cabinet is equal to the length of the side wall of the cabinet. The sealing strip is installed on the upper step surface of the stepped support member and is located directly below the pressing roller.

[0008] Furthermore, the end of the heat insulation board away from the cabinet door abuts against the side of the wiring board facing the cabinet door, and the length of the heat insulation board extending along the side wall of the cabinet is equal to the length of the stepped support member along the same direction minus the width of the wiring board along the same direction.

[0009] Furthermore, the anti-tilting assembly also includes multiple sets of positioning plates sleeved and fixed to the outer surface of the fixed shaft and equidistantly arranged along the axial direction. A horizontal plate is fixed to the outer circumferential surface of the positioning plate near the pressure roller. A fixed sleeve is movably abutted against the upper surface of the horizontal plate. A compression spring with an inclined posture is fixed to the upper surface of the fixed sleeve. A U-shaped locking bar is fixedly inserted through the inner surface of the fixed sleeve. The horizontal plate is located below the bottom of the fixed sleeve, providing support to the bottom of the fixed sleeve in the initial state. When the fixed sleeve rotates upward around the fixed shaft, the upper surface of the horizontal plate disengages from the lower surface of the fixed sleeve. Specifically, the two axial end faces of the fixed sleeve slide against the side surfaces of the adjacent positioning plates, forming a rotational friction pair between them, thereby achieving relative rotation and axial limitation. The side of the horizontal plate near the fixed shaft is slidably connected to the outer surface of the fixed sleeve, which does not interfere with the upward rotation of the fixed sleeve around the fixed shaft, but limits the downward rotation angle of the fixed sleeve.

[0010] Furthermore, the top end of the compression spring is fixedly connected to the outer surface of the positioning plate, the inner wall of the fixing sleeve on one side of the positioning plate is rotatably connected to the outer surface of the fixing shaft, and both axial sides of the fixing sleeve are rotatably connected to the side surface of the positioning plate. The two ends of the clamping bar are respectively fixedly connected to the center of both sides of the pressing roller.

[0011] Furthermore, the inner side of the stepped support member is provided with an auxiliary disassembly assembly. The auxiliary disassembly assembly includes a limiting groove formed on the upper surface of the stepped support member and a lifting plate slidably connected to the inner side of the limiting groove. A lead screw shaft is threadedly connected to the inner side of the center of the lifting plate. Guide shafts that are symmetrically arranged on both sides of the lead screw shaft and slidably connected to the inner side of the lifting plate are provided. The bottom of the lifting plate is also fixedly connected to a first pull rope symmetrically arranged on both sides of the lead screw shaft. The lower surface of the lifting plate is flexibly fixed to the first pull rope through a perforation, and the first pull rope is a rubber rope with a certain degree of hardness and moderate deformation capability.

[0012] Furthermore, the bottom end of the lead screw shaft passes through the interior of the lifting plate and extends downwards, with its extension rotatably connected to the inner wall of the stepped support member. The bottom end of the guide shaft is fixedly connected to the bottom of the inner wall of the limiting groove. The end of the first pull rope away from the lifting plate slides through the inner wall of the stepped support member and is fixedly connected to the upper surface of the fixed sleeve. The guide shafts are symmetrically arranged on both sides of the lead screw shaft to provide guidance and limitation for the up-and-down movement of the lifting plate.

[0013] Furthermore, the lower surface of the sealing strip is provided with a sealing assembly, which includes a placement groove formed on the stepped surface of the stepped support and a base plate slidably connected to the inside of the placement groove.

[0014] Furthermore, symmetrically arranged connecting springs are fixed to the bottom of the base plate, and symmetrically arranged second pull ropes are also fixed to the bottom of the base plate. A limiting tube is slidably fitted onto the outer surface of the second pull rope. The second pull ropes are symmetrically positioned below the base plate. The limiting tube is made of highly smooth polytetrafluoroethylene material with low inner friction, guiding and positioning the second pull rope and significantly reducing sliding wear. It is located at the lower part of the inner wall of the stepped support member, on one side of the connecting spring, and has a curved structure. One end of the tube opens towards the lower surface of the lifting plate, and the other end opens towards the lower surface of the base plate.

[0015] Furthermore, the sealing strip is placed on the upper surface of the base plate, the bottom end of the connecting spring is fixedly connected to the bottom of the inner wall of the placement groove, one end of the second pull rope is fixedly connected to the lower surface of the lifting plate, and the other end is fixedly connected to the lower surface of the base plate, and the outer surface of the limiting tube is fixedly connected to the inner surface of the stepped support.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This device uses horizontally arranged heat insulation panels to vertically divide the cabinet's interior space into an upper sensitive element chamber and a lower main heating element chamber. This prevents the unorganized upward diffusion of hot air generated by the heating elements, avoiding the formation of localized hot spots in the instrument or cable compartments. Furthermore, elastic rollers are installed on both sides of the upper surface of the heat insulation panel. These rollers, supported by compression springs, provide appropriate pressure to adhere to the panel surface. When the heat insulation panel warps slightly upwards at both ends due to long-term temperature differences, the rollers can deflect upwards in the direction of warping. This avoids forcibly restricting deformation and causing edge cracking, while also converting the relative movement between the panel edge and the rollers from sliding friction to rolling friction. This prevents the large amount of wear dust generated by sliding friction from escaping to the circuit breaker or busbar, thus preventing insulation degradation or short circuits.

[0017] This device features a lead screw shaft, a lifting plate, and a first pull rope on the upper surface of the stepped support. When the insulation board needs replacement due to increased warping after years of operation, rotating the lead screw shaft causes the rollers to rotate upwards around a fixed axis, maintaining the raised height thanks to the lead screw's self-locking characteristic. The rollers on both sides of the stepped support can be lifted and locked sequentially, completely releasing the pressure constraint on the upper surface of the insulation board. This structure avoids the problems of scratching and aging powder shedding caused by pressure between the edge of the warped board and the rollers during forced extraction, eliminating extraction resistance.

[0018] This device connects one end of the second pull rope to the lower surface of the lifting plate and the other end to the lower surface of the base plate, enabling the extension and retraction of the sealing strip to be linked with the lifting and lowering of the lifting plate. During normal operation, the lifting plate descends, the second pull rope slackens, and the connecting spring pushes the base plate and sealing strip upwards to adhere to the bottom surface of the insulation board, adaptively filling the wedge-shaped gaps caused by slight warping and blocking the flow of hot air. When the insulation board needs to be replaced, the lifting plate rises and tightens the second pull rope, pulling the base plate downwards and retracting the sealing strip into its placement groove, preventing interference during removal. This linkage structure solves the problem of gaps appearing between the lower surface of the insulation board and the stepped support after warping, causing hot air to escape from these gaps.

[0019] This device places the sealing strip in a groove inside the stepped support, using the groove wall to laterally limit the sealing strip. When the bottom surface of the insulation board presses down on the sealing strip, the groove wall restricts its lateral overflow, ensuring that the sealing strip only undergoes vertical elastic deformation, resulting in uniform stress and a regular shape. Simultaneously, the connecting spring beneath the base plate continuously provides upward elastic support, allowing the sealing strip to maintain its active following ability even under prolonged pressure, constantly rising to fill changing gaps as the insulation board warps. This structure avoids the problems of the sealing strip being flattened and spreading out towards the edges, uneven internal stress distribution, and elastic attenuation caused by the lack of lateral restraint, thus extending the effective service life of the sealing strip. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the cabinet body of the present invention; Figure 3 This is a cross-sectional view of the disassembly assembly of the present invention; Figure 4 This is a schematic diagram of the stepped support member of the present invention; Figure 5 This is a schematic diagram of the positioning plate of the present invention; Figure 6 This is a cross-sectional view of the fixing sleeve of the present invention; Figure 7 This is a schematic diagram of the lifting plate of the present invention; Figure 8 This is a schematic diagram of the structure of the fixing sleeve of the present invention; Figure 9 This is a cross-sectional view of the groove for placing the present invention; Figure 10 This is a cross-sectional view of the stepped support member of the present invention; Figure 11 This is a cross-sectional view of the limiting tube of the present invention.

[0021] In the diagram: 10. Cabinet; 10a. Cable tray; 10b. Heating element; 10c. Control element; 21. Heat insulation board; 22. Stepped support; 23. Sealing strip; 31. Anti-warping assembly; 311. Fixed shaft; 312. Pressing roller; 313. Positioning plate; 314. Horizontal plate; 315. Fixed sleeve; 316. Compression spring; 317. Clamping bar; 32. Auxiliary disassembly assembly; 321. Limiting groove; 322. Lifting plate; 323. Lead screw shaft; 324. Guide shaft; 325. First pull rope; 33. Sealing assembly; 331. Placement groove; 332. Base plate; 333. Connecting spring; 334. Second pull rope; 335. Limiting tube. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0023] For the first embodiment, please refer to... Figures 1-6This invention relates to a high-voltage switchgear with a thermal channel isolation structure, comprising: a cabinet 10, a wiring plate 10a fixed to the inner wall of the cabinet 10, and a heating element 10b and a control element 10c detachably installed on the inner side of the cabinet 10. It also includes a heat insulation plate 21 that isolates the heating element 10b and the control element 10c vertically. Stepped support members 22 extend from the two symmetrical side walls of the cabinet 10, and sealing strips 23 are embedded within the stepped support members 22. The heat insulation plate 21 is placed on the upper side of the stepped support members 22 and abuts against the upper surface of the sealing strip 23. Furthermore, it includes anti-tilting components 31 symmetrically arranged at the two edges of the upper surface of the heat insulation plate 21. The anti-tilting components 31 include a fixed shaft 311 fixed to the inner side of the stepped support members 22 and extending horizontally, and a pressing roller 312 installed in cooperation with the fixed shaft 311. At least two sets of pressing rollers 312 are arranged side-by-side along the extending direction of the side walls of the cabinet 10. The heat insulation board 21 is horizontally installed inside the cabinet 10, abutting against one side of the wiring board 10a, and in conjunction with it, divides the vertical space inside the cabinet 10 into an upper sensitive element chamber and a lower main heating element chamber 10b, thus forming a thermal channel isolation. The heat insulation board 21 is made of SMC. Made of composite materials, it possesses high temperature resistance, excellent thermal insulation performance and mechanical strength. Its length is precisely designed so as not to obstruct the closing of the cabinet 10, and the cabinet 10 can also fit snugly with the door panel after closing to form an effective seal. The rollers are lightweight and wear-resistant rollers to avoid surface wear and powder generation caused by sliding friction. The sealing strip 23 is used to elastically fill the gap between the bottom surface of the heat insulation board 21 and the stepped support member 22 when the heat insulation board 21 warps. The sealing strip 23 is a solid silicone strip with high temperature resistance, wear resistance and anti-aging properties. The upper surface of the sealing strip 23 is not higher than the support surface of the stepped support member 22, so it will not support the heat insulation board 21 in the initial stage, causing the bottom of the heat insulation board 21 to exceed the wiring plate 10a and form a gap.

[0024] The two ends of the cable guide plate 10a abut against the outer surfaces of the stepped support members 22 on both sides. The length of the stepped support member 22 along the side wall of the cabinet 10 is equal to the length of the side wall of the cabinet 10. The sealing strip 23 is installed on the upper step surface of the stepped support member 22 and is located directly below the pressing roller 312.

[0025] The end of the heat insulation board 21 away from the cabinet door abuts against the side of the wiring plate 10a facing the cabinet door. The length of the heat insulation board 21 along the side wall of the cabinet body 10 is equal to the length of the stepped support 22 in the same direction minus the width of the wiring plate 10a in the same direction.

[0026] The anti-tilting assembly 31 also includes multiple sets of positioning plates 313 that are sleeved and fixed to the outer surface of the fixed shaft 311 and are equidistant along the axial direction. A horizontal plate 314 is fixed to the outer peripheral surface of the positioning plate 313 near the pressure roller 312. A fixed sleeve 315 is movably abutted against the upper surface of the horizontal plate 314. A compression spring 316 in an inclined position is fixed to the upper surface of the fixed sleeve 315. A U-shaped locking bar 317 is fixedly inserted through the inner surface of the fixed sleeve 315. The horizontal plate 314 is located below the bottom of the fixed sleeve 315, providing support for the bottom of the fixed sleeve 315 in the initial state. When the fixed sleeve 315 rotates upward around the fixed shaft 311, the upper surface of the horizontal plate 314 disengages from the lower surface of the fixed sleeve 315. Specifically, the two axial end faces of the fixed sleeve 315 slide against the side surfaces of the adjacent positioning plate 313, forming a rotational friction pair between them, thereby achieving relative rotation and axial limitation. The side of the horizontal plate 314 closest to the fixed shaft 311 is slidably connected to the outer surface of the fixed sleeve 315, which does not interfere with the upward rotation of the fixed sleeve 315 around the fixed shaft 311, but limits the downward rotation angle of the fixed sleeve 315.

[0027] The top of the compression spring 316 is fixedly connected to the outer surface of the positioning plate 313. The inner wall of the fixing sleeve 315 on one side of the positioning plate 313 is rotatably connected to the outer surface of the fixing shaft 311, and both axial sides of the fixing sleeve 315 are rotatably connected to the side surfaces of the positioning plate 313. The two ends of the locking bar 317 are fixedly connected to the center of both sides of the pressing roller 312. As can be seen from the figure, the two axial end faces of the fixing sleeve 315 slide against the side surfaces of the adjacent positioning plate 313, forming a rotational friction pair between them, thereby achieving relative rotation and axial limitation. The side of the horizontal plate 314 near the fixing shaft 311 is slidably connected to the outer surface of the fixing sleeve 315, which does not interfere with the upward rotation of the fixing sleeve 315 around the fixing shaft 311, but limits the downward rotation angle of the fixing sleeve 315.

[0028] The specific work process is as follows: During installation, the stepped support members 22 on the left and right sides are fixed to the empty positions inside the cabinet 10 with bolts. The two stepped support members 22 are parallel to each other and at the same horizontal height. They do not occupy the installation space of the main circuit components, nor do they interfere with the original cable routing path. The high-voltage switchgear is a non-standard component and adopts a modular design. The cabinet 10 frame has a large number of reserved mounting holes. The addition of the stepped support members 22 is a standard-permitted modification and does not affect the original function of any components.

[0029] The heat insulation plate 21 is placed horizontally from the front of the cabinet 10, with its bottom ends resting on the upper surfaces of the stepped support members 22 on the left and right sides, respectively. At this time, the heat insulation plate 21 divides the vertical space inside the cabinet into two independent areas: the upper area is the sensitive element chamber, used to install secondary components with low heat generation such as instruments, relays, and control units; the lower area is the main heat-generating element 10b chamber, used to install the main heat-generating elements 10b such as circuit breakers, copper busbar connection points, and contactors.

[0030] In existing equipment, without the heat insulation plate 21, the heat generated by the lower heating element 10b would diffuse uncontrollably within the cabinet. The rising hot air would then directly heat the instrument compartment above, causing localized hot spots and affecting the reliability and lifespan of electronic components. This equipment, through the physical isolation of the heat insulation plate 21, confines the hot air to the lower area, preventing the disorderly transfer of heat to the sensitive component compartment and creating conditions for subsequent centralized heat dissipation.

[0031] After the heat insulation plate 21 is placed in position, it needs to be properly pressed to prevent slight movement due to vibration or transportation. In the initial state, the horizontal plate 314 provides support for the bottom of the fixing sleeve 315, and the compression spring 316 is in a compressed state, so that the roller is just in contact with the upper surface of the heat insulation plate 21. The roller is made of lightweight and wear-resistant material, and the elasticity of the compression spring 316 is designed to provide only appropriate pressure, without leaving indentations or causing damage to the surface of the heat insulation plate 21.

[0032] After the equipment is put into operation, the temperature inside the main heating element 10b chamber will rise significantly. Under full load conditions in summer, the temperature in this area can reach 70℃; while the temperature inside the sensitive element chamber is basically maintained at around 30~40℃ due to the obstruction of the heat insulation plate 21. This condition of long-term temperature difference between the upper and lower surfaces will cause the heat insulation plate 21 to gradually generate thermal stress: the lower surface has a greater tendency to expand due to heat, while the upper surface has a smaller tendency to expand, causing the two ends of the heat insulation plate 21 to gradually warp upwards. This is an inherent characteristic of the heat insulation plate 21 under non-uniform thermal field and cannot be completely avoided.

[0033] When both ends of the heat insulation plate 21 begin to slightly tilt upwards, the tilted edges push the rollers upwards. The rollers, through the locking bar 317, drive the fixing sleeve 315, causing the fixing sleeve 315 to rotate upwards around the outer surface of the fixing shaft 311. During this process, the fixing sleeve 315 overcomes the elastic force of the compression spring 316, and the spring is further compressed. The positioning plates 313 on both sides limit the axial position of the fixing sleeve 315 to prevent it from shifting laterally.

[0034] It should be noted that this device does not attempt to forcibly press down on the insulation plate 21 to prevent it from warping, as this would lead to stress concentration and cause the edges of the insulation plate 21 to crack. The role of the roller is to flexibly follow the warping deformation: when the insulation plate 21 warps slightly, the roller deflects upward accordingly, always maintaining contact with the upper surface of the insulation plate 21, but without generating excessive reverse pressure. This design has two advantages: first, the presence of the roller can detect and limit excessive and rapid warping, slowing down the process of escalating deformation; second, the lifting angle of the roller can be directly observed by maintenance personnel. When the roller is found to be lifting upward, it is known that the insulation plate 21 has undergone significant warping, requiring subsequent inspection or replacement.

[0035] Furthermore, the friction between the pressing roller 312 and the upper surface of the insulation plate 21 is rolling friction. If a fixed plate is used to press the insulation plate 21 from top to bottom, the edge of the plate will slide against the metal plate when the insulation plate 21 warps, inevitably producing a large amount of powder. If this powder falls onto the circuit breaker or busbar, it may cause insulation degradation or even a short circuit. The rolling contact of the roller converts sliding friction into rolling friction, reducing wear and minimizing powder contamination at the source.

[0036] For the second embodiment, please refer to... Figures 1-9 Based on Embodiment 1, the inner side of the stepped support member 22 is provided with a disassembly assembly 32. The disassembly assembly 32 includes a limiting groove 321 formed on the upper surface of the stepped support member 22, and a lifting plate 322 slidably connected to the inner side of the limiting groove 321. A lead screw shaft 323 is threadedly connected to the inner side of the center of the lifting plate 322. Guide shafts 324 are symmetrically arranged on both sides of the lead screw shaft 323 and slidably connected to the inner side of the lifting plate 322. The bottom of the lifting plate 322 is also fixedly connected with first pull ropes 325 symmetrically arranged on both sides of the lead screw shaft 323. The lower surface of the lifting plate 322 is flexibly fixed to the first pull ropes 325 through perforations, and the first pull ropes 325 are rubber ropes with a certain degree of hardness and moderate deformation ability.

[0037] The bottom end of the lead screw shaft 323 passes through the interior of the lifting plate 322 and extends downwards. Its extension is rotatably connected to the inner wall of the stepped support member 22. The bottom end of the guide shaft 324 is fixedly connected to the bottom of the inner wall of the limiting groove 321. The end of the first pull rope 325 away from the lifting plate 322 slides through the inner wall of the stepped support member 22 and is fixedly connected to the upper surface of the fixing sleeve 315. The guide shafts 324 are symmetrically arranged on both sides of the lead screw shaft 323 to provide guidance and limit for the up and down movement of the lifting plate 322.

[0038] The specific work process is as follows: After years of operation, even with the flexible restraint of the pressure rollers 312, the heat insulation panel 21 will still gradually accumulate thermal deformation. When the warping reaches 5mm or more, both ends of the heat insulation panel 21 will noticeably arch upwards. At this point, although the equipment can still be used, it is close to the critical point where it needs to be replaced. Maintenance personnel decide to replace the heat insulation panel 21 based on regular inspections (the lifting of the rollers can be used as an auxiliary reference for judging warping).

[0039] At this point, an operational challenge arises: the heat insulation plate 21 is pressed down from top to bottom by rollers on both sides, creating significant positive pressure between the warped edges of the plate and the pressing rollers 312. Pulling it out by hand is not only laborious, but the warped edges will also scrape against the rollers, generating a large amount of aging powder. Since the heat insulation plate 21 itself is already aged and its surface is prone to powdering, forcibly pulling it out will exacerbate powder formation and contaminate the electrical components below.

[0040] Therefore, this device has a limiting groove 321 on the upper surface of the stepped support member 22, and a lifting plate 322, a guide shaft 324, a lead screw shaft 323, and a first pull rope 325 are installed in the groove. The guide shaft 324 is symmetrically arranged on both sides of the lead screw shaft 323 to ensure the verticality of the lifting plate 322 when it moves up and down. The first pull rope 325 is a rubber rope with a certain degree of hardness and moderate deformation capacity. One end of it is fixed to the bottom of the lifting plate 322, and the other end passes through the inside of the stepped support member 22 and is connected to the upper surface of the fixing sleeve 315.

[0041] The specific steps for replacing heat insulation panel 21 are as follows: The first step is for the maintenance personnel to open the cabinet door and face the lead screw shaft 323 on one side of the stepped support 22. The top of the lead screw shaft 323 is equipped with a rotating plate that can be rotated manually.

[0042] The second step is to rotate the lead screw shaft 323 clockwise. The lead screw shaft 323 is threadedly engaged with the lifting plate 322, and when rotated, it drives the lifting plate 322 to slide upward along the guide shaft 324. The inner wall of the limiting groove 321 guides and limits the outer edge of the lifting plate 322 to prevent it from tilting.

[0043] Thirdly, when the lifting plate 322 rises, the first pull rope 325 fixed at its bottom is pulled upward. The other end of the first pull rope 325 is connected to the upper surface of the fixing sleeve 315, so the fixing sleeve 315 is pulled upward by the pull rope. The fixing sleeve 315 drives the locking bar 317 and the roller to rotate further upward around the fixing shaft 311, so that the roller is completely separated from the upper surface of the heat insulation plate 21. Because the lead screw shaft 323 has a self-locking characteristic, after rotating a certain number of times and releasing the tool, the roller will remain at the raised height and will not fall back automatically.

[0044] To achieve "complete release of the clamping constraint," the lifting height of the rollers should be at least greater than the maximum expected warpage of the heat insulation plate 21. According to long-term operational data, the normal warpage deformation of the heat insulation plate 21 during its lifespan does not exceed 5mm, and under extreme conditions, it does not exceed 8mm. In this embodiment, the thread lead of the lead screw shaft 323 is designed to be 2mm, and the maximum lifting stroke of the lifting plate 322 is 10mm. The corresponding roller lifting angle is approximately 15°, and the lifting height can reach 12mm, which is sufficient to completely release the heat insulation plate 21 from any warped state, ensuring that there is no clamping force during extraction.

[0045] Regarding the synchronization issue after the rollers on both sides are raised, this device does not rely on a mechanical linkage mechanism to ensure absolute synchronization on both sides. Instead, it adopts a "sequential operation, separate locking" work process: the maintenance personnel first fully raise and lock one side's roller, and then operate the other side. Due to the self-locking characteristic of the lead screw shaft 323, the raised side will not automatically fall back, that is, the roller on that side disengages while the other side remains pressed. At this time, the heat insulation plate 21 is in a "one end free, one end pressed" state. Due to the rigidity of the heat insulation plate 21 itself and the contact friction with the bottom of the stepped support 22, it will not produce significant tilting or movement. Moreover, the operation time of the maintenance personnel is short (about 10 seconds for one side), and this temporary state will not cause jamming. This operation process conforms to the conventional operation and maintenance specifications of high-voltage switchgear.

[0046] The effect of "reducing extraction resistance" was quantitatively verified by the following method: On a simulated aging prototype with a warpage of 8mm in the heat insulation plate 21, the extraction resistance was measured using a push-pull force gauge. When the roller was not lifted, the peak extraction resistance was approximately 45N; after lifting the roller, the extraction resistance dropped to approximately 5-10N, which was only the sliding friction between the contact surface of the heat insulation plate 21 and the stepped support 22. Alternatively, if the plate was lifted slightly so that the lower surface of the heat insulation plate 21 was no longer in contact with the upper surface of the stepped support 22 before extraction, there would be virtually no friction.

[0047] Fourth, the maintenance personnel walk to the other side of the cabinet 10 and repeat the above operation on the lead screw shaft 323 on another stepped support 22, so that the roller on that side is also lifted off the heat insulation plate 21.

[0048] Fifth step: At this point, there are no more clamping components above the heat insulation panel 21. The maintenance personnel hold the front end of the heat insulation panel 21 with one hand (note that the heat insulation panel 21 is now warped and deformed; care must be taken to prevent it from suddenly slipping), and use the other hand to help stabilize it, then remove the heat insulation panel 21 horizontally outward. Since there is no longer the clamping force of the rollers, the extraction resistance disappears, and the scraping and wear between the warped edges and the rollers is avoided.

[0049] Step 6: Place the new heat insulation plate 21 in, and then rotate the lead screw shafts 323 on both sides in the opposite direction to lower the lifting plate 322. When the lifting plate 322 lowers, the first pull rope 325 loosens, the fixing sleeve 315 resets under the elastic force of the compression spring 316, and the roller gently presses back onto the upper surface of the heat insulation plate 21, and the equipment returns to standby status.

[0050] The improvement of this device lies in the fact that, by utilizing the self-locking characteristic of the lead screw 323, the roller is actively lifted and locked before replacement, releasing the pressure constraint on the heat insulation plate 21. Compared with direct pulling, this method reduces the extraction force, protects the aging heat insulation plate 21 from secondary damage, and also reduces the generation of friction powder.

[0051] Third embodiment, please refer to Figures 1-11 Based on Embodiment 2, the lower surface of the sealing strip 23 is provided with a sealing component 33. The sealing component 33 includes a placement groove 331 opened on the stepped surface of the stepped support member 22, and a bottom plate 332 slidably connected to the inner side of the placement groove 331.

[0052] A symmetrically arranged connecting spring 333 is fixedly connected to the bottom of the base plate 332, and a symmetrically arranged second pull rope 334 is also fixedly connected to the bottom of the base plate 332. A limiting tube 335 is slidably sleeved on the outer surface of the second pull rope 334. The second pull rope 334 is symmetrically arranged below the base plate 332. The limiting tube 335 is made of high-smooth polytetrafluoroethylene material with low friction on the inner wall. It guides and positions the second pull rope 334 and greatly reduces sliding wear. It is located at the lower part of the inner wall of the stepped support 22, on one side of the connecting spring 333. The structure is curved, with one end opening towards the lower surface of the lifting plate 322 and the other end opening towards the lower surface of the base plate 332.

[0053] The sealing strip 23 is placed on the upper surface of the base plate 332. The bottom end of the connecting spring 333 is fixed to the bottom of the inner wall of the placement groove 331. One end of the second pull rope 334 is fixed to the lower surface of the lifting plate 322, and the other end is fixed to the lower surface of the base plate 332. The outer surface of the limiting tube 335 is fixed to the inner surface of the stepped support 22.

[0054] The specific work process is as follows: In actual operation, the warping of the heat insulation plate 21 is a gradual process. When the warping is still small (e.g., 1-2mm), the roller deflection is not obvious, and maintenance personnel may not even notice it. However, a wedge-shaped gap has already appeared between the bottom of the heat insulation plate 21 and the upper surface of the stepped support 22. This gap is caused by the fact that after the two ends of the heat insulation plate 21 warp upwards, its bottom surface is no longer flat. The area that was originally completely in contact with the stepped support 22 becomes only in edge contact, and it gradually separates from the contact point inwards. Hot air will flow into the sensitive element chamber through this gap, weakening the thermal channel isolation effect. Although most of the heat is still blocked below, the long-term existence of the gap will cause the temperature of the sensitive element chamber to rise slowly, affecting the life of the secondary components.

[0055] If a simple improvement method is adopted, namely, directly pasting an elastic sealing gasket onto the upper surface of the stepped support 22, making its surface protrude from the support surface, the following problems will occur: In the initial stage before the heat insulation board 21 warps, the sealing gasket will be compressed by the bottom surface of the heat insulation board 21 for a long time. Since there is no lateral restraint around the sealing gasket, it will overflow laterally after being compressed, that is, it will be flattened and spread out to the edge, causing irregular deformation. This lateral overflow will cause the stress direction of the sealing gasket to deviate from vertical, and will also lead to uneven distribution of internal stress. Moreover, under long-term continuous pressure, the elasticity of the sealing gasket will gradually decrease. By the time the heat insulation board 21 actually begins to warp and it needs to follow up to fill the gap, it has lost sufficient resilience and cannot effectively fit the warped and irregular bottom surface.

[0056] This device further improves upon the aforementioned structure through the structural design of the sealing component 33. Its core lies in placing the sealing strip 23 within the placement groove 331, using the groove wall to laterally limit the sealing strip 23, ensuring it can only move vertically and preventing lateral overflow. Simultaneously, the lifting plate 322, in conjunction with the second pull rope 334, controls the extension and retraction of the sealing strip 23, ensuring that the sealing strip 23 is only released and adhered after the heat insulation plate 21 is in place.

[0057] The initial installation sequence of the heat insulation panel 21 is as follows: First, before inserting the heat insulation plate 21, rotate the lead screw 323 to bring the lifting plate 322 to its highest position (the same as the state after replacing the heat insulation plate 21 in the second embodiment). At this time, the lifting plate 322 tightens the second pull rope 334 upwards, and the second pull rope 334 pulls the bottom plate 332 downwards, overcoming the elastic force of the connecting spring 333, so that the bottom plate 332 is located at the bottom of the placement groove 331. Thus, the upper surface of the sealing strip 23 is not higher than the support surface of the stepped support member 22, and is completely retracted inside the placement groove 331.

[0058] The second step is to place the new heat insulation board 21 horizontally, so that its bottom surface rests directly on the support surface of the stepped support 22. Since the sealing strip 23 does not protrude, the heat insulation board 21 will not press against the sealing strip 23, so the sealing strip 23 is not significantly compressed in the initial stage and retains its elastic reserve.

[0059] Thirdly, after the heat insulation plate 21 is placed in position, the maintenance personnel reverse the rotation of the lead screw shaft 323 (synchronously with the rotation of the roller) to lower the lifting plate 322 to the designated position. During this process, the second pull rope 334 slides along the inner surface of the limiting tube 335, releasing more rope length into the placement groove 331, thereby releasing the downward pull on the base plate 332. Then, the elastic force of the connecting spring 333 pushes the base plate 332 and the sealing strip 23 upward along the inner wall of the placement groove 331 until the upper surface of the sealing strip 23 adheres to the bottom surface of the heat insulation plate 21. Due to the limiting effect of the groove wall, the sealing strip 23 only undergoes vertical elastic deformation when compressed, without overflowing laterally, resulting in uniform force and a regular shape. At this time, although the sealing strip 23 is also under pressure, its compression is controlled within a reasonable range. As the connecting spring 333 continuously provides upward elastic support, the sealing strip 23 always maintains the ability to actively follow. Even if the heat insulation plate 21 warps later, the sealing strip 23 can continue to rise under the push of the spring, adaptively filling the changing gap.

[0060] After the equipment has been running for a period of time, the heat insulation plate 21 warps slightly due to temperature differences, resulting in a wedge-shaped gap at the bottom. At this time, under the continuous push of the connecting spring 333, the sealing strip 23 will "follow" the shape of the gap as the base plate 332 rises. Solid silicone has good flexibility and can adaptively fill irregular gaps. Even if the gap width is uneven, the sealing strip 23 can achieve a fit through local deformation, thereby blocking most of the hot airflow.

[0061] To address the issue of fitting between the irregular shape of the "wedge-shaped gap" and the rectangular cross-section of the sealing strip 23, this device employs the following structural mechanism to achieve "adaptive filling": First, the sealing strip 23 is made of solid silicone material with a Shore hardness controlled within ± degrees, exhibiting excellent flexibility and a high compression set of ≤10%. When the sealing strip 23 contacts the warped bottom surface of the heat insulation plate 21 under the push of the connecting spring 333, due to the flexibility of the silicone material, the upper surface of the sealing strip 23 will undergo local elastic deformation, closely conforming to the actual contour of the bottom surface of the heat insulation plate 21. Its flexible material will flow into the gap area to fill it, achieving surface-to-irregular surface bonding.

[0062] Second, the sidewall of the placement groove 331 provides horizontal constraint to the sealing strip 23. When the sealing strip 23 is subjected to uneven pressure from the bottom surface of the heat insulation plate 21, the groove wall prevents the sealing strip 23 from being squeezed out laterally in all directions, forcing it to concentrate the compression deformation on the upper surface in the vertical direction, thereby ensuring that the direction of the contact pressure is always perpendicular to the bottom surface of the heat insulation plate 21, and avoiding sealing failure caused by lateral slippage.

[0063] Third, the connecting spring 333 adopts a low-stiffness, long-stroke design with a stiffness K=0.5N / mm, a free length of 15mm, and a working compression of 5-8mm, ensuring that the sealing strip 23 always adheres upwards with an elastic force of approximately 2.5-4N. This elastic force is moderate, ensuring that the contact pressure between the sealing strip 23 and the bottom surface of the heat insulation plate 21 is sufficient to block airflow. Tests show that a contact pressure ≥1.5N can effectively seal gaps smaller than 0.5mm, while avoiding excessive pressure that could lead to over-compression of the sealing strip 23 and accelerate aging.

[0064] Regarding the question of whether the sealing strip 23 will fail due to excessive compression when warping is severe, this device addresses this issue through the following design: When the warping of the insulation board 21 increases, the maximum height of the wedge-shaped gap also increases. However, the sealing strip 23, pushed by the connecting spring 333, moves upward synchronously, maintaining contact with the bottom surface of the insulation board 21, rather than being further compressed. In other words, the compression of the sealing strip 23 mainly originates from the initial installation pressure of the insulation board 21 (approximately 1-2 mm), rather than from changes in the warping gap. During warping, the sealing strip 23 "follows" the warping as a whole rather than being actively "flattened," thus preventing excessive compression failure. After accelerated aging testing at 80℃ for 500 hours, the sealing strip 23, after undergoing 1000 simulated warping-following cycles, still exhibits an elastic recovery rate greater than 90%, with no significant degradation in sealing performance.

[0065] Finally, when the heat insulation board 21 warps further and needs to be replaced, the maintenance personnel follow the steps of the second embodiment to rotate the lead screw shaft 323 to raise the lifting plate 322. At this time, the second pull rope 334 is tightened again, pulling the bottom plate 332 downwards. The sealing strip 23 retracts back into the placement groove 331, without hindering the removal of the heat insulation board 21. After replacing the new board, the above process is repeated.

[0066] The core improvements in this embodiment are as follows: First, the groove wall of the placement groove 331 is used to vertically guide and laterally limit the sealing strip 23, so that it will not overflow laterally when under pressure, and the deformation is uniform and controllable; second, the connecting spring 333 provides a continuous active thrust, so that the sealing strip 23 can always follow the shape change of the bottom surface of the heat insulation plate 21, and will not lose its responsiveness even under long-term pressure; third, the position of the sealing strip 23 in the initial stage is controlled by the lifting plate 322, and it is only released and adhered after the heat insulation plate 21 is installed in place, avoiding meaningless pre-pressure starting in the initial stage, thereby extending the service life of the sealing strip 23.

[0067] Finally, it should be added that the reason why this invention does not directly use fixed partition panels is as follows: If fixed metal or insulating panels are used to divide the cabinet 10 vertically, although preliminary space division can be achieved, the fixed panels cannot be disassembled, which will hinder the maintenance of components inside the cabinet; at the same time, the fixed panels are in a non-uniform temperature field with one side being high temperature and the other side being normal temperature for a long time. Even if the thickness of the panels is increased, they will still deform due to thermal stress caused by the temperature difference between the upper and lower parts. After deformation, gaps will also form at the connection between the panel edge and the cabinet 10, causing hot air to flow through and failing to achieve stable thermal insulation; in addition, thickening the panels will significantly occupy the effective installation space inside the cabinet, reducing the space utilization rate of the cabinet 10, and the panels cannot be replaced individually after deformation and aging, requiring the entire cabinet 10 to be disassembled, resulting in high maintenance costs. In contrast, this invention uses a detachable heat insulation panel 21, together with an anti-warping component 31, an auxiliary disassembly component 32, and a sealing component 33, which not only achieves the function of thermal channel isolation, but also allows for convenient disassembly and maintenance, and the lightweight design does not occupy the effective space of the cabinet 10.

[0068] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A high voltage switchgear assembly having hot aisle isolation, comprising: The cabinet (10), the wiring board (10a) fixed to the inner wall of the cabinet (10), and the heating element (10b) and the control element (10c) detachably installed inside the cabinet (10) are characterized in that: It also includes a heat insulation plate (21) that isolates the heating element (10b) and the control element (10c) from top to bottom. The cabinet (10) has two symmetrical side walls with stepped support members (22) extending from each side, and a sealing strip (23) embedded in the inside of the stepped support member (22). The heat insulation plate (21) is placed on the upper side of the stepped support member (22) and abuts against the upper surface of the sealing strip (23). It also includes anti-warping components (31) symmetrically arranged on both sides of the upper surface of the heat insulation plate (21). The anti-warping components (31) include a fixed shaft (311) fixed to the inside of the stepped support member (22) and extending in the horizontal direction, and a pressing roller (312) installed in cooperation with the fixed shaft (311). At least two sets of pressing rollers (312) are arranged side by side along the extension direction of the side wall of the cabinet (10).

2. The high voltage switchgear with hot channel isolation structure according to claim 1, characterized in that: The two ends of the threading plate (10a) abut against the outer surfaces of the stepped support members (22) on both sides. The length of the stepped support member (22) along the side wall of the cabinet (10) is equal to the length of the side wall of the cabinet (10). The sealing strip (23) is installed on the upper step surface of the stepped support member (22) and is located directly below the pressing roller (312).

3. The high voltage switchgear with hot channel isolation structure according to claim 2, characterized in that: The end of the heat insulation board (21) away from the cabinet door abuts against the side of the wiring board (10a) facing the cabinet door. The length of the heat insulation board (21) along the side wall of the cabinet (10) is equal to the length of the stepped support (22) along the same direction minus the width of the wiring board (10a) along the same direction.

4. The high voltage switchgear assembly with hot aisle isolation structure as claimed in claim 1 wherein: The anti-tilting component (31) also includes multiple sets of positioning plates (313) sleeved and fixed to the outer surface of the fixed shaft (311) and equidistantly arranged along the axial direction. A horizontal plate (314) is fixed to the outer peripheral surface of the positioning plate (313) near the pressing roller (312). A fixed sleeve (315) is movably abutted against the upper surface of the horizontal plate (314). A compression spring (316) arranged in an inclined position is fixed to the upper surface of the fixed sleeve (315). A U-shaped locking bar (317) is fixedly inserted through the inner surface of the fixed sleeve (315).

5. The high voltage switchgear assembly with hot aisle isolation structure as claimed in claim 4 wherein: The top end of the compression spring (316) is fixedly connected to the outer surface of the positioning plate (313). The inner wall of the fixed sleeve (315) on one side of the positioning plate (313) is rotatably connected to the outer surface of the fixed shaft (311). Both axial sides of the fixed sleeve (315) are rotatably connected to the side surface of the positioning plate (313). The two ends of the clamping bar (317) are fixedly connected to the center of both sides of the pressing roller (312).

6. The high voltage switchgear assembly with hot aisle isolation structure as claimed in claim 3 wherein: The inner side of the stepped support (22) is provided with a disassembly assembly (32). The disassembly assembly (32) includes a limiting groove (321) opened on the upper surface of the stepped support (22) and a lifting plate (322) slidably connected to the inner side of the limiting groove (321). A lead screw shaft (323) is threadedly connected to the inner side of the center of the lifting plate (322). Guide shafts (324) that are slidably connected to the inner side of the lifting plate (322) are symmetrically arranged on both sides of the lead screw shaft (323). The bottom of the lifting plate (322) is also fixedly connected with a first pull rope (325) symmetrically arranged on both sides of the lead screw shaft (323).

7. The high voltage switchgear assembly with hot aisle isolation structure as claimed in claim 6 wherein: The bottom end of the lead screw shaft (323) passes through the interior of the lifting plate (322) and extends downward. Its extension is rotatably connected to the inner wall of the stepped support (22). The bottom end of the guide shaft (324) is fixedly connected to the bottom of the inner wall of the limiting groove (321). The end of the first pull rope (325) away from the lifting plate (322) slides through the inner wall of the stepped support (22) and is fixedly connected to the upper surface of the fixing sleeve (315).

8. The high voltage switchgear with hot channel isolation structure according to claim 7, characterized in that: The lower surface of the sealing strip (23) is provided with a sealing component (33), which includes a placement groove (331) opened on the stepped surface of the stepped support (22) and a bottom plate (332) slidably connected to the inside of the placement groove (331).

9. The high voltage switchgear assembly with hot aisle isolation structure as claimed in claim 8 wherein: The bottom of the base plate (332) is fixed with symmetrically arranged connecting springs (333), and the bottom of the base plate (332) is also fixed with symmetrically arranged second pull ropes (334), and the outer surface of the second pull ropes (334) is slidably sleeved with limiting tubes (335).

10. The high voltage switchgear assembly with hot aisle isolation structure as claimed in claim 9 wherein: The sealing strip (23) is placed on the upper surface of the base plate (332), the bottom end of the connecting spring (333) is fixed to the bottom of the inner wall of the placement groove (331), one end of the second pull rope (334) is fixed to the lower surface of the lifting plate (322), and the other end is fixed to the lower surface of the base plate (332). The outer surface of the limiting tube (335) is fixed to the inner surface of the stepped support (22).

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