A flexible insulation structure for joints of switchgear and switchgear

Abstract

The application relates to the technical field of power systems, and relates to a flexible insulation structure for a joint of a switch cabinet and a switch cabinet. The insulation structure comprises a dynamic side connecting piece, a static side connecting piece and a flexible insulation piece. The dynamic side connecting piece comprises a movable arm and a driving part; the static side connecting piece comprises a base and a fixed arm, and the two are hinged through a movable joint. The upper end and the lower end of the flexible insulation piece are respectively provided with openings, the upper end is sealingly fixed to the outer periphery of the dynamic side connecting piece, and the lower end sealingly abuts against the base, so that the movable joint is completely surrounded. The flexible insulation piece can elastically deform in the axial direction and / or the radial direction to adapt to the rotation of the movable arm. The scheme is locally sealed and insulated, accurately covers the high-risk area of the joint, uses the air in the cabinet or existing insulation gas, avoids the use of sulfur hexafluoride gas, ensures insulation reliability, has the advantages of environmental protection and miniaturization, the flexible structure guarantees the integrity of the insulation during the joint movement, and facilitates the integration and maintenance of electrical connection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, and particularly relates to a flexible insulation structure for a joint of a switch cabinet and the switch cabinet. BACKGROUND

[0002] The switch cabinet is a key device for power distribution, control and protection in the power system. Its internal part usually contains movable components such as disconnecting switches, grounding switches, etc. For example, the rotating joint of the disconnecting switch and the operating joint of the grounding switch. These joints need to move during operation, so their insulation treatment has always been a difficulty and focus in the design of the switch cabinet.

[0003] The switch cabinet is a key device for power distribution, control and protection in the power system. Its internal part usually contains movable components such as disconnecting switches, grounding switches, etc. For example, the rotating joint of the disconnecting switch and the operating joint of the grounding switch. These joints need to move during operation, so their insulation treatment has always been a difficulty and focus in the design of the switch cabinet.

[0004] At present, the insulation treatment for the joint of the switch cabinet in the industry mainly exists in the following two technical solutions:

[0005] The first solution is to keep the joint directly exposed. This is the way adopted by many traditional switch cabinets (such as the commonly used KYN28 type switch cabinet). In this solution, the joint part has no additional insulation covering or sealing, and completely relies on air as the insulation medium. In order to ensure sufficient safe insulation distance and prevent breakdown under high voltage, a very large electrical gap and creepage distance must be reserved during design. The direct consequence of this approach is that the overall size of the switch cabinet is large, the floor area is increased, thereby increasing the manufacturing cost and space occupation cost. With the development trend of miniaturization and compactness of power equipment, this solution of trading space for safety has gradually been difficult to meet market demand.

[0006] The second solution is to seal the entire disconnector module as a whole. In order to overcome the shortcomings of the first solution, a more complex insulation mode appears. This solution is to design a large sealed shell, which completely encapsulates the entire disconnector module (including the static contact, the dynamic contact and the joint thereof) therein. Then, the shell is filled with sulfur hexafluoride gas or other insulating gas with a certain pressure, and the insulation capacity is enhanced by using these high dielectric strength gases, so as to realize the miniaturization of the device. However, this solution also has significant shortcomings: first, sulfur hexafluoride gas is identified as a strong greenhouse gas with a very high global warming potential, and leakage will have adverse effects on the environment, which does not meet the current green and environmentally friendly development requirements of power equipment. Secondly, the structure is complex and maintenance is extremely inconvenient. If internal components fail, the entire sealed cavity needs to be opened for maintenance, and the process is tedious. Most importantly, this solution has the inherent risk of insulation failure: once the sealed shell is damaged due to aging, vibration or accidental damage, the insulation strength in the cavity will decrease sharply, which can easily cause internal insulation breakdown and other serious faults, threatening the safety of the power grid.

[0007] In summary, the existing insulation solution for the joint of the switch cabinet in the prior art either causes the device to be bulky due to being kept exposed, or faces the problems of poor environmental friendliness, difficult maintenance and potential insulation failure risk due to overall gas sealing, and needs to be further improved. SUMMARY

[0008] The first invention of the present application aims to overcome the shortcomings of the prior art and provide a flexible insulation structure for the joint of the switch cabinet, which can balance miniaturization, high reliability, environmental friendliness and easy maintenance.

[0009] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0010] The flexible insulation structure for the joint of the switch cabinet comprises a dynamic side connecting piece, a static side connecting piece and a flexible insulation piece. The dynamic side connecting piece comprises a movable arm and a dynamic arm driving part for driving the movable arm. The static side connecting piece comprises a base and a fixed arm, the fixed arm is installed on the base, and the fixed arm and the movable arm are hinged through a movable joint. The upper end of the flexible insulation piece is provided with a first opening and is sealingly fixed to the outer periphery of the dynamic side connecting piece, and the lower end is provided with a second opening and sealingly abuts the base, so as to enclose the movable joint and form a sealed insulation space. The upper end of the movable arm and the dynamic arm driving part extend outward from the first opening. Furthermore, the flexible insulation piece is configured to elastically deform in its axial and / or radial direction to adapt to the rotation of the movable arm relative to the fixed arm.

[0011] The application constructs a sealed and insulated space isolated from the outside by sleeving and sealing the flexible insulation member with both ends of the flexible insulation member to the outer periphery of the dynamic side connecting piece and the static side connecting piece in a cover shape, and the flexible insulation member is configured to be elastically deformed in the axial and / or radial directions. The scheme has the following beneficial effects: first, by accurately limiting the insulation protection range to the high-risk joint area and using the air in the cabinet or the existing insulation gas as the medium, the risk of leakage of sulfur hexafluoride gas is avoided, the environmental protection and reliability are improved, and the core technical foundation for the miniaturization of the switch cabinet is laid; second, the flexible deformation characteristic guarantees the integrity of the dynamic insulation of the joint during the whole operation process, and solves the industry problem that the moving joint is difficult to reliably insulate; in addition, the exposed part of the connecting end is designed outside the sealed space, which ensures that the structure is easy to integrate and does not affect the normal electrical connection.

[0012] Further, the flexible insulation member includes an integrally formed upper connecting part, a special-shaped wave connecting part, and a lower connecting part, the first opening is provided at the upper connecting part, and the second opening is provided at the lower connecting part; the upper end of the base is provided with a connecting groove matched with the lower connecting part, the upper connecting part is sealed and wrapped outside the middle part of the movable arm, the lower connecting part is inserted and connected with the connecting groove, the lower part of the movable arm and the fixed arm are located inside the special-shaped wave connecting part, and the special-shaped wave connecting part has a preset activity space; the special-shaped wave connecting part is in the shape of a bellows, and the wave shapes on the opposite sides thereof are designed to be asymmetric. The scheme realizes the unity of connection reliability and movement flexibility by specifically configuring the flexible insulation member into a three-section structure composed of the integrally formed upper connecting part, the special-shaped wave connecting part, and the lower connecting part. The upper and lower connecting parts mainly provide stable and sealed connection with the dynamic side connecting piece and the static side connecting piece, and the special-shaped wave connecting part undertakes the movement deformation function. Further, the special-shaped wave connecting part is designed to be in the shape of a bellows and the wave shapes on the opposite sides thereof are asymmetric, and this structure is directionally optimized according to the different mechanical properties of the two sides of the joint during movement, i.e., stretching and compression deformation. During the movement of the joint, the asymmetric wave shape can more reasonably guide and distribute the deformation, which helps to relieve local stress concentration, thereby improving the fatigue resistance of the material and the service life of the structure, and enhancing the reliability and durability of the insulation protection of the joint under frequent and large-angle operation.

[0013] Further, the special-shaped wave connecting part is divided into a tensile side and a compressive side arranged oppositely along the axis of the flexible insulation part; wherein the tensile side comprises a plurality of tensile corrugated parts, and the compressive side comprises a plurality of compressive corrugated parts; and at least one of the wave crest height, the wave steepness and the spacing of adjacent corrugated parts of the tensile corrugated part and the compressive corrugated part is different. The present scheme realizes precise control and optimization of deformation by dividing the special-shaped wave connecting part into a tensile side and a compressive side along the axis of the flexible insulation part, and differentiating the design of at least one of the wave crest height, the wave steepness and the spacing of the tensile corrugated part and the compressive corrugated part on the two sides. The division and differentiation design enables the flexible insulation part to respond to the two different deformation modes of stretching and compression during joint movement: the tensile side corrugated part mainly optimizes the tensile resistance to prevent excessive elongation from causing wall thickness thinning or rupture; and the compressive side corrugated part mainly optimizes the compression resistance to ensure stable buffering during deformation and avoid instability.

[0014] Further, the number of the tensile corrugated parts and the compressive corrugated parts is at least three, and from top to bottom, the tensile corrugated parts include a first tensile corrugated part, a second tensile corrugated part and a third tensile corrugated part in sequence, and the compressive corrugated parts include a first compressive corrugated part, a second compressive corrugated part and a third compressive corrugated part in sequence; and the third tensile corrugated part and the third compressive corrugated part are in the same horizontal plane and have the same wave shape and wave crest height. The present scheme realizes cooperative control and stress optimization of the deformation process by setting the number of corrugated parts on the tensile and compressive sides to at least three, constructing an ordered hierarchical structure from top to bottom, and setting the third tensile corrugated part and the third compressive corrugated part in the same horizontal plane and with the same wave shape and wave crest height at the bottom. Specifically, the setting of three or more corrugated parts provides multi-level and progressive buffering and adjustment capability for deformation, making the deformation process more stable and orderly. The third tensile and compressive corrugated parts at the bottom are structurally symmetrically corresponding, and together form a stable deformation reference plane in the initial upright state of the joint, ensuring that the forces on both sides are balanced in the initial stage of joint movement; during joint movement, the pair of symmetric corrugated parts can deform in coordination, effectively sharing the stress generated by movement, and avoiding local twisting or jamming caused by inconsistent responses on both sides. This structural design helps to prolong the mechanical life of the flexible insulation part and improve its insulation reliability and motion consistency in complex motion states.

[0015] Further, the peak height of the second stretch corrugated part is smaller than that of the third stretch corrugated part, and the waveform is steeper than that of the third stretch corrugated part; the peak height of the first stretch corrugated part is smaller than that of the second stretch corrugated part. In this scheme, the first and second stretch corrugated parts on the upper side have steeper waveforms, which is beneficial to providing effective support and dispersing stress in the initial stage of deformation; the third stretch corrugated part on the lower side has higher peak and slower waveform, which provides the main deformation stroke and buffer space for large-angle stretching. The differentiated structure from top to bottom, from steep to slow, and from low to high, enables the stretching shape to be sequentially transmitted according to the designed gradient, effectively avoids excessive stress concentration in local areas, significantly improves the material fatigue resistance and the service life of the structure under repeated action, and further enhances the reliability of the insulation protection.

[0016] Further, the spacing between the first compression corrugated part and the second compression corrugated part is greater than the spacing between the second compression corrugated part and the third compression corrugated part; and the peak height of the first compression corrugated part is lower than that of the first stretch corrugated part, and the axial height of the peak top is higher than that of the first stretch corrugated part. It should be noted that the "peak height" of the present application refers to the waveform amplitude, and the "axial height" refers to the coordinate of the peak top along the axis direction of the flexible insulation part. The differentiated design realizes the optimal control of compression deformation through the cooperation of spacing and waveform: the larger corrugated spacing on the upper side reserves more sufficient deformation stroke and buffer capacity, enabling the deformation to be transmitted smoothly from bottom to top, effectively avoiding premature stress concentration; at the same time, the higher axial position and slower waveform of the peak on the compression side enable it to participate in deformation at the initial stage of joint action, and together with the asymmetric stretch side structure, it forms a high-efficiency deformation response characteristic. This structure is particularly suitable for large-angle joint action of up to 120 degrees, and by providing ample and leading deformation space on the compression side, it ensures that the flexible material will not be excessively squeezed in a large range of deformation, thereby ensuring the action reliability and durability of the insulation structure.

[0017] Further, the second opening and the base are sealingly connected by epoxy glue. Moreover, the material of the flexible insulation part is silicone rubber. This scheme realizes the synergistic optimization of material performance and sealing process by further limiting the use of epoxy glue for sealing connection and silicone rubber as the material of the flexible insulation part. The selected silicone rubber material has good surface adsorption, which can form a reliable sealing connection with the matching surface treatment technology and epoxy glue, ensuring the integrity of the sealed insulation space. This material has good electrical insulation performance and can meet the insulation requirements of the switch cabinet operation. At the same time, silicone rubber has excellent elasticity and can deform accordingly with high-speed joint action, and its anti-mechanical fatigue characteristics remain intact after 10,000 repeated actions, thereby ensuring the reliability and durability of the insulation structure under long-term dynamic operation conditions.

[0018] Further, the movable arm driving part is connected to the middle side of the movable arm, the first opening is arranged on the top and the side of the upper connecting part, the movable arm driving part is triangular, and has a first driving end and a second driving end connected with the movable arm and a driven end connected with the external driving structure.

[0019] Further, the average distance between adjacent corrugated parts on the stretching side is greater than the average distance between adjacent corrugated parts on the compression side. The present scheme realizes more fine control and optimization of the articulation deformation by setting the average distance between adjacent corrugated parts on the stretching side to be greater than that on the compression side. This design fully considers the different characteristics of the two deformation modes of stretching and compression: stretching deformation mainly shows material extension, which needs longer deformation stroke to disperse stress, while compression deformation needs to maintain structural stability. The larger distance between adjacent corrugated parts on the stretching side provides more sufficient deformation buffer space for the material, effectively reducing the risk of stress concentration in the stretching process; the relatively denser distance between adjacent corrugated parts on the compression side enhances the structural stiffness of this side, ensuring more uniform and controllable compression deformation.

[0020] Another object of the present application is to provide a switch cabinet provided with a flexible insulation structure; wherein the flexible insulation structure is arranged at the joint of the disconnecting switch or the grounding switch of the switch cabinet. Compared with the prior art, the switch cabinet of the present application has all the advantages of the above-mentioned flexible insulation structure. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the flexible insulation structure;

[0022] Figure 2 is a structural schematic diagram of the flexible insulation structure Figure 1 ;

[0023] Figure 3 is a structural schematic diagram of the flexible insulation structure Figure 2 .

[0024] Figure 4 is a structural schematic diagram of the flexible insulation structure Figure 3 ;

[0025] Figure 5 is a sectional view of the flexible insulation structure.

[0026] LABEL EXPLANATION:

[0027] Movable side connecting piece 1, movable arm 11, movable arm driving part 13, first driving end 131, second driving end 132, driven end 133, static side connecting piece 2, base 22, connecting groove 221, fixed arm 21, movable joint 12, flexible insulation piece 3, upper connecting part 4, first opening 41, special-shaped wave connecting part 5, lower connecting part 6, second opening 61, stretch wave part 7, first stretch wave part 71, second stretch wave part 72, third stretch wave part 73, compression wave part 8, first compression wave part 81, second compression wave part 82, third compression wave part 83. DETAILED DESCRIPTION

[0028] Embodiments of the present application will be described below with reference to the accompanying drawings:

[0029] Referring to Figures 1-5 As shown in the drawings, the present application discloses a flexible insulation structure for the joint of a switch cabinet, comprising a movable side connecting piece 1, a static side connecting piece 2 and a flexible insulation piece 3; the movable side connecting piece 1 comprises a movable arm 11 and a movable arm driving part 13 for driving the movable arm 11; the static side connecting piece 2 comprises a base 22 and a fixed arm 21, the fixed arm 21 being mounted on the base 22 and being hinged to the movable arm 11 through a movable joint 12; the upper end of the flexible insulation piece 3 is provided with a first opening 41 and is sealingly fixed to the outer periphery of the movable side connecting piece 1, and the lower end is provided with a second opening 61 and is sealingly abutted to the base 22, so as to enclose the movable joint 12 and form a sealed insulation space; wherein the upper end of the movable arm 11 and the movable arm driving part 13 extend outward from the first opening 41; and the flexible insulation piece 3 is configured to be elastically deformed in its axial and / or radial direction to adapt to the rotation of the movable arm 11 relative to the fixed arm 21.

[0030] Further, the flexible insulation piece 3 comprises an integrally formed upper connecting portion 4, a special-shaped wave connecting portion 5 and a lower connecting portion 6, the first opening 41 is arranged at the upper connecting portion 4, the second opening 61 is arranged at the lower connecting portion 6, and the upper end of the base 22 is provided with a connecting groove 221 matched with the lower connecting portion 6; the upper connecting portion 4 is sealed and wrapped outside the middle part of the movable arm 11, the lower connecting portion 6 is inserted and connected with the connecting groove 221, the lower part of the movable arm 11 and the fixed arm 21 are located inside the special-shaped wave connecting portion 5, and the special-shaped wave connecting portion 5 has a preset movable space; the special-shaped wave connecting portion 5 is in the shape of a bellows, and the wave shapes on the opposite sides thereof are designed to be asymmetric. According to the scheme, the flexible insulation piece 3 is specifically constructed as a three-section structure composed of the integrally formed upper connecting portion 4, the special-shaped wave connecting portion 5 and the lower connecting portion 6, thereby realizing the unity of connection reliability and movement flexibility. Among them, the upper connecting portion 4 and the lower connecting portion 6 mainly provide stable and sealed connection with the movable side connecting piece 1 and the static side connecting piece 2, and the special-shaped wave connecting portion 5 bears the movement deformation function. Further, the special-shaped wave connecting portion 5 is designed to be in the shape of a bellows and the wave shapes on the opposite sides thereof are asymmetric, and this structure is directionally optimized according to the different mechanical properties of the two sides respectively bearing tensile and compressive deformation during joint movement. During joint movement, the asymmetric wave shape can more reasonably guide and distribute deformation, which helps to relieve local stress concentration, thereby improving the fatigue resistance of the material and the service life of the structure, and enhancing the reliability and durability of the insulation protection of the joint under frequent and large-angle operation.

[0031] Further, the special-shaped wave connecting portion 5 is divided into oppositely arranged tensile side and compressive side along the axis L of the flexible insulation piece 3; wherein the tensile side comprises a plurality of tensile wave portions 7, and the compressive side comprises a plurality of compressive wave portions 8; and at least one of the wave crest height, the wave shape steepness and the spacing of adjacent wave portions of the tensile wave portions 7 and the compressive wave portions 8 is different from each other. According to the scheme, the special-shaped wave connecting portion 5 is divided into tensile side and compressive side along the axis L of the flexible insulation piece 3, and at least one of the wave crest height, the wave shape steepness and the spacing of the tensile wave portions 7 and the compressive wave portions 8 on the two sides is designed to be different, thereby realizing precise control and optimization of deformation. The division and differential design enable the flexible insulation piece 3 to directionally respond to the two different deformation modes of tensile and compression during joint movement: the tensile side wave portion mainly optimizes the tensile resistance performance to prevent excessive elongation from causing wall thickness thinning or rupture; and the compressive side wave portion mainly optimizes the compression resistance performance to ensure stable buffering and avoid instability during deformation.

[0032] Further, the number of the stretching corrugated sections 7 and the compressing corrugated sections 8 is at least three, and from top to bottom, they respectively include the first stretching corrugated section 71, the second stretching corrugated section 72 and the third stretching corrugated section 73, and the first compressing corrugated section 81, the second compressing corrugated section 82 and the third compressing corrugated section 83; and the third stretching corrugated section 73 and the third compressing corrugated section 83 are in the same horizontal plane and have the same wave shape and wave crest height. The scheme realizes the coordinated control of the deformation process and the stress optimization by setting the number of the corrugated sections on the stretching and compressing sides to be at least three, constructing the ordered hierarchical structure from top to bottom, and setting the third stretching corrugated section 73 and the third compressing corrugated section 83 in the same horizontal plane and having the same wave shape and wave crest height at the bottom. Specifically, the setting of three or more corrugated sections provides multi-stage and gradual buffering and adjusting capacity for the deformation, making the deformation process more stable and orderly. The third stretching and compressing corrugated sections at the bottom are symmetrically corresponding in structure and jointly form a stable deformation reference plane in the initial upright state of the joint, ensuring that the forces on both sides of the joint are balanced in the initial stage of movement; in the joint movement process, the pair of symmetric corrugated sections can deform in coordination, effectively sharing the stress generated by the movement and avoiding local twisting or jamming caused by inconsistent responses on both sides. This structural design helps to prolong the mechanical life of the flexible insulation piece 3 and improve its insulation reliability and movement consistency in complex movement states.

[0033] Further, the wave crest height of the second stretching corrugated section 72 is smaller than that of the third stretching corrugated section 73, and the wave shape of the second stretching corrugated section 72 is steeper than that of the third stretching corrugated section 73. In the scheme, the first stretching corrugated section 71 and the second stretching corrugated section 72 located above have steeper wave shape, which is conducive to providing effective support and dispersing stress in the initial stage of deformation; the third stretching corrugated section 73 located below has higher wave crest and slower wave shape, which provides the main deformation stroke and buffer space for large-angle stretching. This differentiated structure from top to bottom, from steep to slow and from low to high, makes the stretching deformation orderly transfer according to the designed gradient, effectively avoiding excessive concentration of stress in local areas, thereby significantly improving the material fatigue resistance and the service life of the structure under repeated action, and further enhancing the reliability of insulation protection.

[0034] Further, the spacing between the first compressing corrugated section 81 and the second compressing corrugated section 82 is greater than the spacing between the second compressing corrugated section 82 and the third compressing corrugated section 83; the wave crest height of the first compressing corrugated section 81 is lower than that of the first stretching corrugated section 71, but the axial height of the wave crest vertex of the first compressing corrugated section 81 is higher than that of the first stretching corrugated section 71. This design makes the deformation transfer from bottom to top when the joint moves and generates compressive deformation, and the first compressing corrugated section 81 and the second compressing corrugated section 82 located above reserve more sufficient deformation stroke and buffer capacity due to the larger spacing, effectively avoiding the premature concentration of compressive stress in local areas, so that the entire compression process is more stable and controllable.

[0035] Further, the second opening 61 is sealed and connected to the base 22 by epoxy glue; and the material of the flexible insulation piece 3 is silicone rubber. This scheme realizes the synergistic optimization of material performance and sealing process by further limiting the use of epoxy glue for sealing and connection and the use of silicone rubber as the material of the flexible insulation piece 3. The selected silicone rubber material has good surface adsorption, can form a reliable sealing connection with the epoxy glue through a matching surface treatment technology, and ensures the integrity of the sealed insulation space. This material has good electrical insulation performance and can meet the insulation requirements of the switch cabinet operation. At the same time, the silicone rubber has excellent elasticity and can deform correspondingly with the high-speed operation of the joint. Its anti-mechanical fatigue characteristics do not break after 10,000 reciprocating operations, thereby ensuring the reliability and durability of the insulation structure under long-term dynamic operation conditions.

[0036] Further, the movable arm driving part 13 is connected to the middle side of the movable arm 11, the first opening 41 is arranged on the top and side of the upper connecting part 4, and the movable arm driving part 13 is triangular and has a first driving end 131 and a second driving end 132 connected to the movable arm 11 and a driven end 133 connected to an external driving structure.

[0037] Further, the average distance between adjacent corrugated parts on the stretching side is greater than the average distance between adjacent corrugated parts on the compression side. This scheme realizes more refined control and optimization of joint motion deformation by setting the average distance between adjacent corrugated parts on the stretching side to be greater than that on the compression side. This design fully considers the different characteristics of the two deformation modes of stretching and compression: stretching deformation mainly shows material extension, which needs a longer deformation stroke to disperse stress, while compression deformation needs to maintain structural stability. The larger distance on the stretching side provides more sufficient deformation buffer space for the material, effectively reducing the risk of stress concentration in the stretching process; the relatively denser distance on the compression side enhances the structural stiffness on this side, ensuring more uniform and controllable compression deformation.

[0038] In a preferred embodiment of the present application, the special-shaped wave connecting part 5 is integrally designed in a shape gradually expanding from top to bottom. This design realizes comprehensive improvement of technical effects in three dimensions: in terms of electrical performance, the expanding structure forms a natural stress cone, effectively optimizing the electric field distribution and preventing electric field concentration; in terms of mechanical performance, its ample lower space completely avoids motion interference and the resulting eccentric wear risk, while enhancing structural stability; in terms of space layout, this shape realizes the compactness of the structure by precisely optimizing the internal space under the premise of ensuring the necessary safety clearance, providing key support for the miniaturization design of the switch cabinet as a whole, thereby realizing synergistic improvement in insulation reliability, mechanical life and space utilization efficiency.

[0039] As a preferred embodiment of the present application, in order to further optimize the adaptability to large-angle movement of up to 120 degrees and the insulation reliability, the corrugated design of the special-shaped wave connecting part 5 has a precise spatial and morphological matching relationship with the hinge point of the movable joint 12, i.e. the hinge axis of the movable joint 12. Specifically:

[0040] The axial height of the peak vertex of the first compression corrugated part 81 is set to be lower than the hinge point of the movable joint 12, while the axial height of the peak vertex of the first stretching corrugated part 71 is set to be slightly higher than the hinge point of the movable joint 12. This spatial position relationship enables the first stretching corrugated part 71 to timely approach the movable arm 11 when the joint is rotating, thereby effectively limiting the excessive stretching and preventing the material from being damaged due to excessive deformation.

[0041] In terms of spacing design, the spacing between the first stretching corrugated part 71 and the second stretching corrugated part 72 is set to be greater than the spacing between the second stretching corrugated part 72 and the third stretching corrugated part 73. Meanwhile, on the compression side, the spacing between the first compression corrugated part 81 and the second compression corrugated part 82 is set to be much greater than the spacing between the second compression corrugated part 82 and the third compression corrugated part 83.

[0042] The above-mentioned large-spacing design on the compression side, combined with the first compression corrugated part 81 which is located higher and has a more gentle wave shape, together ensures that when the joint moves and generates compression deformation, the deformation occurs and is smoothly transmitted in the order of first compression corrugated part 81 → second compression corrugated part 82 → third compression corrugated part 83. In this process, the peak deformation of the first compression corrugated part 81 and the valley deformation between the first compression corrugated part 81 and the second compression corrugated part 82 cooperatively offset most of the initial compression amount. This hierarchical and orderly deformation mechanism makes the entire compression process extremely controllable, thereby ensuring continuous and reliable insulation safety even when facing extreme angle movements.

[0043] The present application sets the two ends of the flexible insulation part 3 in the form of a cover to the outer periphery of the dynamic side connecting part 1 and the static side connecting part 2 respectively, and seals and fixes them, thereby constructing a sealed and insulated space isolated from the outside. At the same time, the flexible insulation part 3 is constructed to be able to elastically deform axially and / or radially. This scheme achieves the following beneficial effects: first, by accurately limiting the insulation protection range to the high-risk joint area and using the air in the cabinet or the existing insulation gas as the medium, the risk of sulfur hexafluoride gas leakage is avoided, the environmental protection and reliability are improved, and a core technical foundation is laid for the miniaturization of the switch cabinet; second, the flexible deformation characteristic guarantees the integrity of the dynamic insulation of the joint during the entire operation process, solving the industry problem of reliable insulation of the movable joint; in addition, the exposed part of the connecting end is designed outside the sealed space, ensuring that the structure is easy to integrate and does not affect normal electrical connection.

[0044] The application further discloses a switch cabinet (not shown in the figure) provided with the flexible insulation structure; wherein the flexible insulation structure is arranged at a disconnecting switch joint or a grounding switch joint of the switch cabinet.

[0045] According to the disclosure and teaching of the above description, those skilled in the art of the present application can also make changes and modifications to the above embodiments. Therefore, the present application is not limited to the specific embodiments disclosed and described above, and some modifications and changes of the present application should fall within the protection scope of the claims of the present application. In addition, although some specific terms are used in the specification, these terms are only for convenience of description and do not constitute any limitation on the present application.

Claims

1. A flexible insulation structure for a switchgear joint, characterized in that, The flexible insulation structure comprises: a moving side connecting member (1) comprising a movable arm (11) and a movable arm driving part (13) for driving the movable arm (11); a static side connecting member (2) comprising a base (22) and a fixed arm (21) mounted on the base (22), and the fixed arm (21) is hinged with the movable arm (11) through a movable joint (12); a flexible insulation member (3) having a first opening (41) at its upper end and being sealingly fixed on the outer periphery of the moving side connecting member (1), and having a second opening (61) at its lower end and being sealingly connected with the base (22), so as to enclose the movable joint (12) and form a sealed insulation space; the upper end of the movable arm (11) and the movable arm driving part (13) extend outward from the first opening (41); and the flexible insulation member (3) is configured to be elastically deformed in its axial and / or radial direction to adapt to the rotation of the movable arm (11) relative to the fixed arm (21); the flexible insulation member (3) comprises an integrally formed upper connecting part (4), a special-shaped wave connecting part (5) and a lower connecting part (6), the first opening (41) is arranged at the upper connecting part (4), the second opening (61) is arranged at the lower connecting part (6), and the upper end of the base (22) is provided with a connecting groove (221) matched with the lower connecting part (6); the upper connecting part (4) is sealingly wrapped outside the middle part of the movable arm (11), the lower connecting part (6) is insertedly connected with the connecting groove (221), the lower part of the movable arm (11) and the fixed arm (21) are located inside the special-shaped wave connecting part (5), and the special-shaped wave connecting part (5) has a preset movable space; the special-shaped wave connecting part (5) is in the shape of a bellows, and the wave shapes of the opposite sides thereof are designed to be asymmetric.

2. The flexible insulation structure according to claim 1, wherein the special-shaped wave connecting part (5) is divided into opposite stretching side and compression side along the axis of the flexible insulation member (3); the stretching side comprises a plurality of stretching wave parts (7), and the compression side comprises a plurality of compression wave parts (8); and at least one of the wave crest height, the wave steepness and the spacing between adjacent wave parts of the stretching wave parts (7) and the compression wave parts (8) are different from each other.

3. The flexible insulation structure of claim 2, wherein, the number of the stretching wave parts (7) and the compression wave parts (8) is at least three respectively, and they sequentially comprise a first stretching wave part (71), a second stretching wave part (72) and a third stretching wave part (73), and a first compression wave part (81), a second compression wave part (82) and a third compression wave part (83) from top to bottom; and the third stretching wave part (73) and the third compression wave part (83) are at the same horizontal plane and have the same wave shape and wave crest height.

4. The flexible insulation structure of claim 3, wherein, the wave crest height of the second stretching wave part (72) is smaller than that of the third stretching wave part (73), and the wave shape of the second stretching wave part (72) is steeper than that of the third stretching wave part (73); and the wave crest height of the first stretching wave part (71) is smaller than that of the second stretching wave part (72).

5. The flexible insulation structure of claim 3, wherein, The interval between the first compression corrugated part (81) and the second compression corrugated part (82) is greater than the interval between the second compression corrugated part (82) and the third compression corrugated part (83); the crest height of the first compression corrugated part (81) is lower than the first stretching corrugated part (71), and the axial height of the crest top point is higher than the first stretching corrugated part (71).

6. The flexible insulation structure according to any one of claims 1 to 5, wherein, The second opening (61) and the base (22) are connected by epoxy glue sealing; and the material of the flexible insulation part (3) is silicone rubber.

7. The flexible insulation structure according to claim 1, wherein, The movable arm driving part (13) is connected to the middle side of the movable arm (11), and the first opening (41) is arranged on the top and side of the upper connecting part (4); The movable arm driving part (13) is triangular, which has a first driving end (131) and a second driving end (132) connected to the movable arm (11), and a driven end (133) connected to an external driving structure.

8. The flexible insulation structure according to any one of claims 2 to 5, wherein, The average interval between adjacent corrugated parts on the stretching side is greater than the average interval between adjacent corrugated parts on the compression side.

9. Switchgear cabinet, characterized in that The flexible insulation structure according to any one of claims 1 to 8; The flexible insulation structure is arranged at the isolating switch joint of the switch cabinet; and / or the flexible insulation structure is arranged at the grounding switch joint of the switch cabinet.

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