Insulating porcelain bushing of switch circuit breaker

Abstract

The invention belongs to the technical field of insulating porcelain bushings, and particularly relates to a switch circuit breaker insulating porcelain bushing. Comprising a middle guide cylinder, a porcelain skirt edge, an outer bearing structure and an inner supporting structure, outer bearing structures and porcelain skirts in one-to-one correspondence with the outer bearing structures are evenly arranged on the outer wall of the middle guide cylinder from top to bottom, and the porcelain skirts are arranged on the outer wall of the middle guide cylinder in a sleeving mode and arranged on the outer bearing structures in an inserted mode. An inner supporting structure is arranged in the middle guide cylinder and used for penetrating from the interior of the middle guide cylinder to the exterior of the middle guide cylinder to position the outer bearing structure. A three-stage sealing structure is adopted, wherein the first-stage sealing structure is arranged at the inner connecting position of the outer bearing structure, and radial dynamic sealing is achieved; the second-stage seal is arranged on a connecting interface of the porcelain skirt edge, the middle guide cylinder and the outer bearing structure to realize static sealing of the interface; and the third-stage seal is arranged at the joint of the end part of the middle guide cylinder and the inner supporting structure, so that the axial sealing of the end surface is realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of insulating porcelain sleeves, and particularly relates to a switch circuit breaker insulating porcelain sleeve. BACKGROUND

[0002] The insulating porcelain sleeve is a crucial external insulating component in a circuit breaker, and its core function is to isolate the high-potential conductive part (such as a moving contact, a static contact and an arc-extinguishing chamber) inside the circuit breaker from the grounded device shell (such as a circuit breaker support and a tank body) to form sufficient insulation strength, prevent high-voltage breakdown to the ground and ensure the safety of equipment and people; at the same time, as a part exposed outside the device, it must be able to withstand the environmental tests of nature, such as rain, snow, fog and pollution, and maintain stable insulation performance under various adverse weather conditions.

[0003] At present, the insulating porcelain sleeve is mostly one-piece, which is sintered into a shape by clay, then ground and fired, and then assembled and detected, but the one-piece insulating porcelain sleeve has an umbrella-shaped porcelain skirt on the outer wall, which is prone to cracking or fine cracks and other stress damage during transportation, thereby seriously affecting the insulation performance in the subsequent use process; the reason why the current insulating porcelain sleeve adopts a one-piece structure instead of a split assembly is that the sealing performance of the assembled insulating porcelain sleeve is difficult to guarantee, which makes it difficult to maintain stable insulation performance in the external environment.

[0004] Therefore, in order to guarantee the sealing performance of the insulating porcelain sleeve while reducing the probability of stress damage of the insulating porcelain sleeve during transportation and improving the convenience of the insulating porcelain sleeve during transportation, the application provides a switch circuit breaker insulating porcelain sleeve. SUMMARY

[0005] In order to solve the above problems, the application provides a switch circuit breaker insulating porcelain sleeve to solve the problems mentioned in the background.

[0006] In order to achieve the above purpose, the application provides the following technical scheme: the application provides a switch circuit breaker insulating porcelain sleeve, which comprises a middle guide cylinder, a porcelain skirt, an outer support structure and an inner support structure; the outer wall of the middle guide cylinder is uniformly provided from top to bottom with the outer support structure and the porcelain skirt corresponding to the outer support structure one by one, and the porcelain skirt is sleeved on the outer wall of the middle guide cylinder and is inserted and arranged on the outer support structure.

[0007] The inner part of the middle guide cylinder is provided with the inner support structure, which is used for positioning the outer support structure from the inside of the middle guide cylinder to the outside.

[0008] The insulation porcelain sleeve adopts a two-stage fixing structure: the first stage is external radial fixing of the porcelain skirt edge to the outer wall of the middle guide cylinder through the outer support structure; and the second stage is internal axial locking fixing of the outer support structure through the inner support structure penetrating the middle guide cylinder.

[0009] The insulation porcelain sleeve adopts a three-stage sealing structure: the first stage sealing is arranged at the internal connection of the outer support structure to realize radial dynamic sealing; the second stage sealing is arranged at the connection interface of the porcelain skirt edge and the middle guide cylinder and the outer support structure to realize interface static sealing; and the third stage sealing is arranged at the connection of the end of the middle guide cylinder and the inner support structure to realize end surface axial sealing.

[0010] According to an advantageous embodiment, the middle guide cylinder is made of ceramic material, and the upper and lower ends of the middle guide cylinder are both stepped, the middle guide cylinder is provided with a plurality of through holes penetrating the center thereof, and the plurality of through holes are uniformly arranged along the axial direction of the middle guide cylinder.

[0011] According to an advantageous embodiment, the outer support structure comprises a magnetic ring sleeve sleeved on the outer wall of the middle guide cylinder, the upper end of the magnetic ring sleeve is provided with an upper support section for threaded connection with the porcelain skirt edge; the outer support structure further comprises a limiting ring sleeved on the outer wall of the middle guide cylinder and located below the magnetic ring sleeve, the middle of the magnetic ring sleeve is provided with a middle locking section for plug-in locking with the inner support structure; the lower end of the magnetic ring sleeve is provided with a lower connecting section for fixing with the limiting ring; the limiting ring is threadedly connected with the lower connecting section of the lower end of the magnetic ring sleeve, and a sealing rubber ring is further arranged at the connection position of the limiting ring and the lower connecting section.

[0012] According to an advantageous embodiment, the upper side of the limiting ring is provided with an external thread section, the external thread section is composed of a plurality of arc sections uniformly arranged, the external thread section of the limiting ring is internally provided with a rubber sleeve with a straight-angled trapezoidal cross section, the limiting ring is threadedly connected with the lower connecting section of the magnetic ring sleeve, and each arc section is close to the axial direction of the limiting ring, so that the position of the limiting ring is fixed and insulated by deforming and extruding the rubber sleeve through the arc sections.

[0013] According to an advantageous embodiment, the inner support structure comprises a hollow guide rod arranged in the inner part of the middle guide cylinder, both ends of the hollow guide rod are fixed in the inner part of the middle guide cylinder through flanges threadedly connected therewith, and the flanges are provided with rubber gaskets at the stepped positions of the upper and lower ends of the middle guide cylinder.

[0014] The outer wall of the hollow guide rod is uniformly provided with a plurality of limiting grooves corresponding to the through holes on the middle guide cylinder along the axial direction, the limiting grooves penetrate the inside of the hollow guide rod, the outer wall of the hollow guide rod and below each limiting groove is provided with a supporting sleeve, a group of ear seats are arranged on the supporting sleeve corresponding to the position of the limiting groove, and a limiting rod is arranged in each group of ear seats through a torsional spring; the outer wall of the limiting rod is sleeved with a lock rod in sliding cooperation, a limiting spring is arranged in the sliding groove between the lock rod and the limiting rod; a strip-shaped pressing plate is further arranged to penetrate the inside of the limiting groove, the lower end surface of the strip-shaped pressing plate cooperates with one end of the lock rod, a penetrating groove is arranged in the middle part of the strip-shaped pressing plate, the limiting spring is compressed when the strip-shaped pressing plate presses the lock rod, and the other end of the lock rod is gradually penetrated through the through hole on the middle guide cylinder and then locked at the middle locking section position of the magnetic ring sleeve.

[0015] According to an advantageous embodiment, the inner support structure further comprises two threaded fixing rods arranged outside the hollow guide rod, a plurality of uniformly arranged pressing pieces are jointly sleeved between the two threaded fixing rods, the pressing pieces are fixed through nuts arranged on the outer wall of the threaded fixing rods, the spacing between adjacent two pressing pieces is the same as the spacing between adjacent porcelain skirts, and the outer wall of the upper end of the hollow guide rod is provided with an adjusting nut for driving all the pressing pieces to move downward together.

[0016] According to an advantageous embodiment, the sealing rubber ring and the rubber sleeve jointly form the first-stage sealing.

[0017] According to an advantageous embodiment, a rubber sealing ring is arranged at the connection between the porcelain skirt and the magnetic ring sleeve and between the porcelain skirt and the outer wall of the middle guide cylinder, thereby forming the second-stage sealing.

[0018] According to an advantageous embodiment, a rubber gasket arranged between the flange plate and the stepped end surface of the middle guide cylinder forms the third-stage sealing.

[0019] Compared with the prior art, the switch disconnector insulating porcelain sleeve provided by the embodiment of the application has the following beneficial effects: 1. The traditional porcelain sleeve is divided into a middle guide cylinder, a detachable porcelain skirt and a supporting structure matched therewith, so that modular transportation is realized, the risk of damage caused by vibration during transportation is greatly reduced, and the split design reduces the weight of a single piece and improves the convenience of handling and storage.

[0020] 2. This invention addresses the sealing difficulties in split-assembly. It employs a first-level radial seal at the connection between the limiting ring and the magnetic ring sleeve, achieved through the compression of a sealing rubber ring and a rubber sleeve. Simultaneously, rubber sealing rings are placed between the ceramic skirt and the magnetic ring sleeve, and between the outer wall of the central guide cylinder, blocking the path of seepage along the through hole, thus completing a second-level seal. Furthermore, flanges and rubber gaskets at both ends of the hollow guide rod press against the stepped end face of the central guide cylinder, achieving a third-level seal and ensuring internal airtightness. Through the synergistic effect of these multi-level seals, the ceramic sleeve maintains high insulation strength even in harsh environments such as rain, snow, and dirt.

[0021] 3. This invention achieves two-stage fixation of the ceramic skirt through the linkage design of the outer support structure and the inner support structure. In specific fixing, the ceramic skirt is first pressed by the threaded engagement of the magnetic ring sleeve and the limiting ring to provide basic support, forming the first-stage external radial fixation; then, the inner support structure is inserted into the locking section of the magnetic ring sleeve through the through hole of the locking rod, applying radial locking force from the inside out to avoid displacement caused by thermal expansion and contraction or vibration, forming the second-stage internal axial locking fixation. The dual fixation not only improves the anti-displacement ability of the ceramic skirt, but also simplifies the assembly process through integrated operation (rotating the adjusting nut can lock all ceramic skirts simultaneously), ensuring assembly efficiency and consistency. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention from the main view position.

[0023] Figure 2 This is a cross-sectional view of the internal structure of the present invention when the internal support structure is just inserted into the middle guide tube.

[0024] Figure 3 For the present invention Figure 2 Cross-sectional view of the internal structure after the adjusting nut is turned into contact with the top of the pressing part.

[0025] Figure 4 For the present invention Figure 3 A cross-sectional view of the structure after the adjusting nut is turned and locked between the locking rod and the magnetic ring sleeve.

[0026] Figure 5 For the present invention Figure 2 A magnified view of section A in the image.

[0027] Figure 6 This is a perspective view of the support sleeve and the limiting rod of the present invention.

[0028] Figure 7 This is a perspective view of the strip pressure plate of the present invention.

[0029] Figure 8 This is a cross-sectional view of the present invention showing multiple pressing components fixed to a threaded fixing rod by nuts.

[0030] Figure 9 Figure 1 is a perspective view of the limiting ring of the present application.

[0031] In the figure, reference numeral 1 is a middle guide cylinder; 2 is a porcelain skirt; 3 is an outer support structure; 4 is an inner support structure; 5 is a conductive rod; 11 is a through hole; 31 is a magnetic ring sleeve; 311 is an upper support section; 312 is a middle locking section; 313 is a lower connecting section; 32 is a limiting ring; 321 is an arc-shaped section; 33 is a sealing rubber ring; 34 is a rubber sleeve; 41 is a hollow guide rod; 42 is a support sleeve; 43 is an ear seat; 44 is a limiting rod; 45 is a locking rod; 46 is a limiting spring; 47 is a strip-shaped pressing plate; 471 is a through hole; 48 is a threaded fixing rod; 49 is a pressing piece; 410 is an adjusting nut; 411 is a limiting groove; 412 is a flange; 413 is a rubber gasket. DETAILED DESCRIPTION

[0032] The following will be described in detail below with reference to the accompanying drawings. Figure 1 - the accompanying drawings Figure 9 The present application will be further described in detail.

[0033] Please refer to Figure 1 and Figure 3 A switch disconnector insulating porcelain sleeve, comprising a middle guide cylinder 1, a porcelain skirt 2, an outer support structure 3 and an inner support structure 4; the outer wall of the middle guide cylinder 1 is uniformly provided from top to bottom with the outer support structure 3 and the porcelain skirt 2 corresponding to the outer support structure 3 one by one, the porcelain skirt 2 is sleeved on the outer wall of the middle guide cylinder 1 and is inserted and arranged on the outer support structure 3, the inner part of the middle guide cylinder 1 is provided with the inner support structure 4, the inner support structure 4 is used for positioning the outer support structure 3 from the inside of the middle guide cylinder 1 to the outside, and the conductive rod 5 is arranged through the inside of the inner support structure 4.

[0034] During specific assembly, first, a plurality of porcelain skirts 2 are fixed and arranged on the outer wall of the middle guide cylinder 1 through the outer support structure 3 one by one, it should be noted that the distance between the specific adjacent two porcelain skirts 2 is arranged according to the installation standard, then the inner support structure 4 is fixed in the inside of the middle guide cylinder 1, the porcelain skirt 2 fixed outside is positioned and fixed again by operating the inner support structure 4; the stability of the fixed porcelain skirt 2 is ensured by the double inner and outer fixing mode, at the same time, the sealing property between the porcelain skirt 2 and the middle guide cylinder 1, the middle guide cylinder 1 and the outer support structure 3, and the inner support structure 4 and the middle guide cylinder 1 is maintained respectively during the inner and outer fixing, finally, the conductive rod 5 is arranged through the inside of the inner support structure 4, the upper end of the conductive rod 5 is connected with the static contact of the disconnector arc-extinguishing chamber, and the lower end of the conductive rod 5 is connected with the moving contact of the disconnector arc-extinguishing chamber.

[0035] Refer to Figure 2 and Figure 3The middle guide cylinder 1 is made of ceramic material, and the upper and lower ends of the middle guide cylinder 1 are stepped. A plurality of through holes 11 are arranged on the middle guide cylinder 1 and penetrate the center of the middle guide cylinder 1. The plurality of through holes 11 are uniformly arranged along the axial direction of the middle guide cylinder 1. It should be noted that the spacing between the adjacent two through holes 11 is set according to the corresponding production standard of the specific model.

[0036] Referring to Figure 2 and Figure 3 and Figure 5 The outer support structure 3 includes a magnetic ring sleeve 31 sleeved on the outer wall of the middle guide cylinder 1. The upper end of the magnetic ring sleeve 31 is provided with an upper support section 311 for threaded connection with the porcelain skirt 2. The middle part of the magnetic ring sleeve 31 is provided with a middle locking section 312 for plug-in locking with the inner support structure 4. The outer support structure 3 further includes a limiting ring 32 sleeved on the outer wall of the middle guide cylinder 1 and located below the magnetic ring sleeve 31. The lower end of the magnetic ring sleeve 31 is provided with a lower connecting section 313 for fixing with the limiting ring 32. The limiting ring 32 is threadedly connected with the lower connecting section 313 of the lower end of the magnetic ring sleeve 31, and the mating portions of the two are further provided with a sealing rubber ring 33.

[0037] Referring to Figure 5 and Figure 9 The upper side of the limiting ring 32 is provided with an external thread section, which is composed of a plurality of arc sections 321 uniformly arranged. The external thread section of the limiting ring 32 is provided with a rubber sleeve 34 with a straight-angled trapezoidal cross section. The limiting ring 32 is threadedly connected with the lower connecting section 313 of the magnetic ring sleeve 31, and each arc section 321 is close to the axial direction of the limiting ring 32. The position fixation and insulation isolation of the limiting ring 32 are realized by deforming and extruding the rubber sleeve 34 through the arc section 321.

[0038] Before installing the porcelain skirt 2, a rubber sleeve 34 is sleeved in the limiting ring 32, and a sealing rubber ring 33 is sleeved outside the limiting ring 32. Specifically, during the installation of the porcelain skirt 2, the limiting ring 32, the magnetic ring sleeve 31 and the porcelain skirt 2 are sequentially sleeved on the outer wall of the middle guide cylinder 1. Then, the middle locking section 312 of the magnetic ring sleeve 31 is corresponded with the through hole 11 at the installation position. Then, the limiting ring 32 is screwed to cooperate with the magnetic ring sleeve 31, and the position of the magnetic ring sleeve 31 is fixed by the limiting ring 32. During the screwing of the limiting ring 32, the connection position is sealed by the cooperation of the sealing rubber ring 33 and the rubber sleeve 34. After completion, the porcelain skirt 2 is screwed to be fixed on the upper support section 311 of the magnetic ring sleeve 31. It should be noted that, in order to ensure the sealing effect of the porcelain skirt 2 after being fixed on the outer wall of the middle guide cylinder 1, referring to the attached Figure 2Rubber sealing rings are installed at the connection between the ceramic skirt 2 and the magnetic ring sleeve 31, and between the ceramic skirt 2 and the outer wall of the central guide cylinder 1. The rubber sealing rings further prevent rain, snow, fog, dirt and other external environmental elements from entering the interior of the central guide cylinder 1 through the through hole 11, thus avoiding poor sealing performance and affecting insulation performance. Multiple sealing treatments are applied to the upper and lower sides of the connection between the individual ceramic skirt 2 and the central guide cylinder 1, effectively preventing impurities from entering the interior of the central guide cylinder 1 through the through hole 11, thereby effectively ensuring its insulation performance during use. At the same time, the ceramic skirt 2 is designed as a detachable structure, which facilitates its transportation and assembly, avoiding the problems of large-scale breakage during transportation caused by the existing integrated structure.

[0039] To further improve the stability of the magnetic ring sleeve 31 on the central guide cylinder 1, thereby ensuring the fixing effect of the ceramic skirt 2 and preventing relative displacement of the ceramic skirt 2 on the central guide cylinder 1 due to external factors such as thermal expansion and contraction during later use after assembly, the inner support structure 4 further supports and fixes all the ceramic skirts 2 assembled on the central guide cylinder 1 from the inside out; see reference. Figure 4 and Figure 5 The inner support structure 4 includes a hollow guide rod 41 disposed inside the middle guide cylinder 1. The two ends of the hollow guide rod 41 are fixed inside the middle guide cylinder 1 by flanges 412 that are threadedly connected to it. Rubber gaskets 413 are provided at the upper and lower steps of the flanges 412 and the middle guide cylinder 1.

[0040] See Figure 5 , Figure 6 and Figure 7 The outer wall of the hollow guide rod 41 is uniformly provided with a plurality of limiting grooves 411 that correspond one-to-one with and pass through the through holes 11 on the central guide cylinder 1. The limiting grooves 411 penetrate the interior of the hollow guide rod 41. A support sleeve 42 is provided on the outer wall of the hollow guide rod 41 below each limiting groove 411. A set of lugs 43 is provided on the support sleeve 42 at the position corresponding to the limiting groove 411. A limiting rod 44 is rotatably provided in each lug 43 through a torsion spring. The outer wall of the limiting rod 44 is fitted with a sliding fit. The locking rod 45 has a sliding groove between it and the limiting rod 44, and a limiting spring 46 is provided in the groove. A strip-shaped pressure plate 47 is also provided inside the limiting groove 411. The lower end face of the strip-shaped pressure plate 47 cooperates with one end of the locking rod 45. The middle part of the strip-shaped pressure plate 47 is provided with a through hole 471 for the conductive rod 5 to pass through. When the strip-shaped pressure plate 47 presses down on the locking rod 45, the limiting spring 46 is compressed. The other end of the locking rod 45 gradually passes through the through hole 11 on the middle guide cylinder 1 and is locked in the middle locking section 312 of the magnetic ring sleeve 31.

[0041] Continue reading Figure 5 andFigure 8 The inner support structure 4 further comprises two threaded fixing rods 48 arranged outside the hollow guide rod 41, and a plurality of pressing members 49 are arranged uniformly between the two threaded fixing rods 48, and the pressing members 49 are fixed by nuts arranged on the outer wall of the threaded fixing rods 48, the spacing between adjacent two pressing members 49 is the same as the spacing between adjacent ceramic skirt edges 2, and the upper end of the hollow guide rod 41 is provided with an adjusting nut 410 on the outer wall in a threaded manner, which is used to drive all the pressing members 49 to move downward together.

[0042] Specifically, when assembling the inner support structure 4, referring to Figures 2-4 First, a plurality of pressing members 49 on the threaded fixing rod 48 are assembled, and after completion, they are arranged outside the hollow guide rod 41; then a strip-shaped pressing plate 47 is placed in each limiting groove 411, and the adjusting nut 410 is installed on the upper end of the hollow guide rod 41 in a threaded manner.

[0043] Then, after the above assembly is completed, the above whole is inserted into the inside of the middle guide cylinder 1, it should be noted that the inside of the middle guide cylinder 1 is provided with a sliding groove for limiting the pressing members 49, then the adjusting nut 410 is screwed to press the upper end of the threaded fixing rod 48, which drives all the pressing members 49 to move downward together along the sliding groove, and the locking rods 45 are pressed downward at the corresponding positions, the locking rods 45 slide under the limiting of the limiting rods 44 and are twisted at a certain angle, until the locking rods 45 are inserted into the through holes 11 at the corresponding positions and penetrate into the middle locking section 312 of the magnetic ring sleeve 31; thereby further fixing the position of the magnetic ring sleeve 31.

[0044] Finally, after the above locking is completed, the hollow guide rod 41 is fixed at both ends of the middle guide cylinder 1 by the flange plate 412, and the stepped portion is sealed by the rubber gasket 413.

[0045] Through the single operation of the inner support structure 4, all the magnetic ring sleeves 31 can be integrated and fixed synchronously, which simplifies the assembly steps and also ensures the sealing performance of the internal structure after assembly.

[0046] The present application realizes primary sealing insulation through the rubber sleeve 34 sleeved inside the limiting ring 32 and the sealing rubber ring 33 sleeved outside, and realizes secondary sealing insulation through the rubber sealing ring arranged between the connecting part of the porcelain skirt 2 and the magnetic ring sleeve 31 and between the porcelain skirt 2 and the outer wall of the middle guide cylinder 1, and further realizes tertiary sealing through the flange plate 412 cooperating with the rubber ring 413 to extrude at the upper and lower ends of the middle guide cylinder 1; the multi-stage sealing sufficiently guarantees the sealing insulation use effect of the assembled insulation porcelain sleeve, and the porcelain skirt 2 is fixed in the first stage through the cooperation of the magnetic ring sleeve 31 and the limiting ring 32, and is further axially locked through the inner support structure 4, so that the installation position of the porcelain skirt 2 is fixed in the second stage, and the stability of the fixed porcelain skirt 2 is sufficiently guaranteed, and the relative movement of the porcelain skirt 2 on the outer wall of the middle guide cylinder 1 is avoided, so that the stability of the assembled insulation porcelain sleeve is guaranteed.

[0047] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0048] In addition, the terms "first", "second", "one", "two" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "one", "two" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0049] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] The embodiments of the present application are preferred embodiments of the present application, and do not limit the protection scope of the present application, and thus, equivalent changes made on the basis of the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A switchgear insulator comprising a middle section, a porcelain skirt, an outer support structure and an inner support structure; characterized in that: The outer wall of the middle guide cylinder is uniformly provided with an outer supporting structure and a porcelain skirt edge corresponding to the outer supporting structure from top to bottom, and the porcelain skirt edge is sleeved on the outer wall of the middle guide cylinder and is inserted on the outer supporting structure; The inner part of the middle guide cylinder is provided with an inner supporting structure for positioning the outer supporting structure from the inside of the middle guide cylinder to the outside thereof; The insulation porcelain sleeve adopts a two-stage fixing structure: the first stage is the external radial fixing of the porcelain skirt edge on the outer wall of the middle guide cylinder through the outer supporting structure; and the second stage is the internal axial locking fixing of the outer supporting structure through the inner supporting structure penetrating the middle guide cylinder; The insulation porcelain sleeve adopts a three-stage sealing structure: the first stage is the radial dynamic sealing of the inner connecting part of the outer supporting structure; the second stage is the interface static sealing of the connecting interface between the porcelain skirt edge and the middle guide cylinder and the outer supporting structure; and the third stage is the end surface axial sealing of the connecting part between the end part of the middle guide cylinder and the inner supporting structure.

2. A switch disconnect insulator housing according to claim 1, wherein, The middle guide cylinder is made of ceramic material, and the upper and lower ends of the middle guide cylinder are both stepped, the middle guide cylinder is provided with a plurality of through holes penetrating the center thereof, and the plurality of through holes are uniformly arranged along the axial direction of the middle guide cylinder.

3. A switch disconnect insulator housing according to claim 1, wherein, The outer supporting structure includes a magnetic ring sleeve sleeved on the outer wall of the middle guide cylinder, the upper end of the magnetic ring sleeve is provided with an upper supporting section for threaded connection with the porcelain skirt edge; the middle part of the magnetic ring sleeve is provided with a middle locking section for plug-in locking with the inner supporting structure; the outer supporting structure further includes a limiting ring sleeved on the outer wall of the middle guide cylinder and located below the magnetic ring sleeve, the lower end of the magnetic ring sleeve is provided with a lower connecting section for fixing with the limiting ring; the limiting ring is threadedly connected with the lower connecting section of the lower end of the magnetic ring sleeve, and a sealing rubber ring is further arranged at the connection part of the limiting ring and the magnetic ring sleeve.

4. A switch disconnect insulator housing according to claim 3, wherein, The upper side of the limiting ring is provided with an external thread section, the external thread section of the limiting ring is composed of a plurality of arc sections uniformly arranged, the inner side of the external thread section of the limiting ring is provided with a rubber sleeve with a straight-angled trapezoidal cross section, the limiting ring is threadedly connected on the lower connecting section of the magnetic ring sleeve, and each arc section is close to the axial direction of the limiting ring, and the position fixing and insulation isolation of the limiting ring are realized by deforming and extruding the rubber sleeve through the arc sections.

5. A switch disconnect insulator housing according to claim 1 wherein, The inner supporting structure includes a hollow guide rod arranged in the inner part of the middle guide cylinder, both ends of the hollow guide rod are fixed in the inner part of the middle guide cylinder through flanges threadedly connected therewith, and the flanges and the upper and lower stepped parts of the middle guide cylinder are provided with rubber gaskets. The outer wall of the hollow guide rod is uniformly provided with a plurality of limiting grooves corresponding to the through holes on the middle guide cylinder along the axial direction, the limiting grooves penetrate the inside of the hollow guide rod, the outer wall of the hollow guide rod below each limiting groove is provided with a support sleeve, the support sleeve is provided with a group of ear seats at the position corresponding to the limiting groove, and a limiting rod is rotationally arranged in each group of ear seats through a torsional spring; the outer wall of the limiting rod is sleeved with a lock rod in sliding fit, a limiting spring is arranged in the sliding groove between the lock rod and the limiting rod; a strip-shaped pressing plate is further arranged in the limiting groove, the lower end surface of the strip-shaped pressing plate is matched with one end of the lock rod, the middle part of the strip-shaped pressing plate is provided with a through hole, the limiting spring is compressed when the strip-shaped pressing plate presses the lock rod, and the other end of the lock rod is gradually locked in the middle locking section position of the magnetic ring sleeve after penetrating the through hole on the middle guide cylinder.

6. A switch disconnect insulating porcelain housing according to claim 5, characterized in that The inner support structure further comprises two threaded fixing rods arranged outside the hollow guide rod, a plurality of uniformly arranged pressing pieces are sleeved between the two threaded fixing rods, the pressing pieces are fixed through nuts arranged on the outer wall of the threaded fixing rods, the spacing between adjacent two pressing pieces is the same as the spacing between adjacent porcelain skirt edges, and the outer wall of the upper end of the hollow guide rod is provided with an adjusting nut for driving all the pressing pieces to move downward together.

7. A switch disconnect insulating porcelain housing according to claim 4, characterized in that The sealing rubber ring and the rubber sleeve jointly form the first-stage sealing.

8. A switch disconnect insulating porcelain housing according to claim 3, characterized in that A rubber sealing ring is arranged at the connection between the porcelain skirt edge and the magnetic ring sleeve and between the outer wall of the porcelain skirt edge and the middle guide cylinder, so as to form the second-stage sealing.

9. A switch disconnect insulating porcelain housing according to claim 5, characterized in that, A rubber gasket arranged between the flange plate and the stepped end surface of the middle guide cylinder forms the third-stage sealing.

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