An insulating bushing with adjustable axial dimensions

Abstract

This utility model relates to the field of insulating sleeve technology, aiming to solve the problems of existing insulating bushings with fixed dimensions, which are difficult to adapt to the adjustment of field equipment docking dimensions, leading to insulation failure of connecting bolts. Furthermore, the separate design of the bushing and washer results in insufficient fitting precision and easy loosening over long-term operation, increasing the risk of insulation failure and subsequently causing equipment overheating, short circuits, and other malfunctions. This utility model provides an axially adjustable insulating bushing, including a first insulating bushing component and a second insulating bushing component that are nested together. The outer end of the first insulating bushing component has an integrally formed first washer; the outer end of the second insulating bushing component has an integrally formed second washer. The beneficial effects of this utility model are: adapting to the needs of field equipment docking dimension adjustment, improving the stability of the bushing and washer fit, reducing the risk of insulation failure, ensuring the reliable function of the connecting bolt insulation, and effectively avoiding equipment overheating and short circuits.

Description

Technical Field

[0001] This utility model relates to the field of insulating sleeve technology, and more specifically, to an insulating bushing with adjustable axial dimensions. Background Technology

[0002] In power systems, the casing connections of critical equipment such as transformers, high-voltage switches, and busbars are mechanically fixed with bolts. However, if these bolts directly conduct current through the equipment casings, it can easily lead to disordered current flow between different casings, causing electrical faults such as short circuits, equipment overheating, and leakage, seriously threatening the safe and stable operation of the power system. Therefore, to block the current path between casings, the installation of the aforementioned bolts must be accompanied by insulating bushings, which is one of the core measures to ensure the electrical safety of the equipment.

[0003] However, during on-site equipment installation, the actual dimensions of the equipment docking positions often require adjustment due to manufacturing errors, installation accuracy, and operating environment. This necessitates that the insulating bushings possess a certain degree of adaptability. Currently, the industry commonly uses uniformly sized tubular insulating bushings. This structure has revealed several problems in practical applications: First, the conflict between on-site dimensional adjustment requirements and the rigidity of the uniform dimensions often results in insulating bushings being too long or too short, preventing effective insulation coverage of the connecting bolts requiring insulation and leading to insulation failure. Second, existing insulating bushings and insulating washers are mostly separate designs. During assembly, insufficient fitting precision can easily create gaps, and under long-term operation, vibration, thermal expansion and contraction can cause loosening and displacement, further exacerbating the risk of insulation failure. Third, these insulation failures directly lead to the formation of unintended conductive paths between the equipment casings, causing localized overheating, short circuits, and other faults. This not only affects the equipment's service life but also poses a serious threat to the operational safety of the power system. Utility Model Content

[0004] The present invention aims to provide an axially adjustable insulating bushing to solve the problems of fixed insulating bushing dimensions in the prior art, which make it difficult to adapt to the adjustment of the docking dimensions of the equipment on site, resulting in insulation failure of the connecting bolts; and the separate design of the bushing and washer, which results in insufficient fitting accuracy and easy loosening during long-term operation, exacerbating the risk of insulation failure, and thus causing equipment overheating, short circuit and other faults.

[0005] The embodiments of this utility model are implemented as follows:

[0006] This utility model embodiment provides an axially adjustable insulating bushing, which includes a first insulating bushing component and a second insulating bushing component;

[0007] The end of the first insulating bushing component near the second insulating bushing component is sleeved on the end of the second insulating bushing component near the first insulating bushing component;

[0008] The first insulating bushing component has a first washer at the end away from the second insulating bushing component, and the first washer and the first insulating bushing component are integrally formed together.

[0009] The second insulating bushing component has a second washer at the end away from the first insulating bushing component, and the second washer and the second insulating bushing component are integrally formed together.

[0010] In use, the first insulating bushing component is inserted into the mounting hole on one side of the equipment, and the second insulating bushing component is inserted into the mounting hole on the other side of the equipment, so that the mating parts of the first insulating bushing component and the second insulating bushing component are nested together. The screw of the fixing bolt is passed through the central hole of the first insulating bushing component and the second insulating bushing component, and the bolt is tightened to complete the installation.

[0011] The axially adjustable insulating bushing disclosed in this embodiment integrates the first washer and the second washer with the first insulating bushing component and the second insulating bushing component, respectively. This effectively avoids insulation problems caused by improper size or installation fit at the overlap between the washer and the bushing. Consequently, the axially adjustable insulating bushing has the beneficial effects of adapting to the on-site equipment docking size adjustment requirements, improving the stability of the bushing and washer fit, reducing the risk of insulation failure, ensuring the reliable performance of the insulation function of the connecting bolts, and effectively avoiding equipment overheating and short circuits.

[0012] Optionally, the diameters of the first washer and the second washer are larger than those of the first insulating bushing component and the second insulating bushing component.

[0013] This configuration allows the first and second washers to radially limit and edge-wrap the first and second insulating bushing components, effectively restricting their displacement or detachment under vibration, impact, and other operating conditions, thereby enhancing the overall structural assembly stability and fatigue resistance. At the same time, it expands the insulation protection range, covering the edge gap between the bushing and adjacent components, reducing the risks of creepage and arc breakdown, and optimizing insulation and protection performance.

[0014] Optionally: the first insulating bushing component has a mating hole inside at one end near the second insulating bushing component, and the second insulating bushing component has a mating portion at one end near the first insulating bushing component, the mating portion being slidably fitted into the mating hole.

[0015] This configuration allows for a sliding fit between the mating hole of the first insulating bushing component and the slidably fitted mating part of the second insulating bushing component. This provides axial adjustment margin, effectively compensating for assembly errors, thermal expansion and contraction, and vibration stress, preventing cracking or loosening caused by rigid connections, and improving structural stability. Furthermore, radial constraints prevent skewing and ensure overall coaxiality and structural integrity, guaranteeing the reliable realization of insulation and isolation functions.

[0016] Optionally, the inner diameter of the aforementioned mating hole is equal to the diameter of the aforementioned mating portion.

[0017] This configuration, by making the inner diameter of the aforementioned mating hole equal to the diameter of the aforementioned mating part to form an interference fit, enables the aforementioned mating hole and the aforementioned mating part to achieve a tight and rigid connection. This structure, on the one hand, eliminates the gap between the two, avoiding radial wobble or loosening caused by the existence of gaps, and significantly improves the structural stability and overall rigidity of the aforementioned first insulating bushing component and the aforementioned second insulating bushing component after docking. On the other hand, the tight interference fit can reduce the risk of external dust, moisture and other impurities entering through the docking gap, while ensuring the precise maintenance of the coaxiality of the aforementioned first insulating bushing component and the aforementioned second insulating bushing component, providing structural support for the long-term reliable performance of the insulation and isolation function.

[0018] Optionally, the length of the aforementioned mating hole is adapted to the length of the aforementioned mating portion.

[0019] This configuration allows the first and second insulating bushing components to achieve a full-length fit when they are mated. The full-length fit maximizes the contact area between the mating hole and the mating part, effectively dispersing the stress on the mating surface, avoiding wear or deformation caused by localized stress concentration, and extending the service life of the structure. At the same time, the complete length fit enhances the radial constraint effect, ensuring that the first and second insulating bushing components maintain stable coaxiality during axial sliding adjustment or long-term use, reducing the risk of misalignment caused by insufficient local mating length, and also reducing the intrusion of external impurities through the mating gap, thus ensuring insulation performance.

[0020] Optionally: the bottom of the aforementioned mating hole has an annular conical surface, and the end of the aforementioned mating portion has an annular conical head, the aforementioned annular conical head being adapted to the aforementioned annular conical surface.

[0021] This configuration allows the first insulating bushing component and the second insulating bushing component to fit together more closely, increasing the contact area and improving the sealing and stability of the connection between the first insulating bushing component and the second insulating bushing component.

[0022] Optionally, the first insulating bushing component and the second insulating bushing component described above have coaxial through holes.

[0023] With this configuration, the through hole facilitates the insertion of the bolt through the hole, allowing the bolt to be tightened and the installation to be completed, thereby forming an insulating layer between the equipment and the bolt.

[0024] Optionally, the outer diameters of the first insulating bushing component and the second insulating bushing component are the same.

[0025] This design makes the insulating bushing more aesthetically pleasing and also makes it easier to fit the mounting holes on the equipment.

[0026] Optionally, the first insulating bushing component and the second insulating bushing component are made of rigid insulating material or soft composite material.

[0027] This configuration allows for flexible selection of suitable materials for the insulating bushing depending on the scenario. Rigid materials ensure structural rigidity and resistance to deformation, while soft composite materials enhance adaptability to assembly errors and thermal expansion and contraction, all of which meet the core insulation requirements.

[0028] Optionally, the first insulating bushing component and the second insulating bushing component described above are columnar structures.

[0029] This design ensures a regular and symmetrical overall shape, facilitating manufacturing and standardized production. The columnar structure provides uniform radial insulation thickness, ensuring consistent insulation performance in different directions and avoiding weak points in local insulation. At the same time, the regular columnar shape facilitates stable cooperation with other components, simplifies the assembly process, improves installation efficiency, and evenly distributes stress under load, reducing stress concentration problems caused by structural irregularities and ensuring long-term stable insulation performance.

[0030] In summary, the axially adjustable insulating bushing disclosed in this utility model has the beneficial effects of adapting to the on-site equipment docking size adjustment requirements, improving the stability of the bushing and washer fit, reducing the risk of insulation failure, ensuring the reliable performance of the insulation function of the connecting bolts, and effectively avoiding equipment overheating and short circuits. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a three-dimensional perspective view of an insulating bushing with adjustable axial dimensions according to an embodiment of the present utility model.

[0033] Figure 2 This is a cross-sectional view of an insulating bushing with adjustable axial dimensions according to an embodiment of the present invention.

[0034] Icons: 1-First insulating bushing component, 2-Second insulating bushing component, 3-First washer, 4-Second washer, 5-Mating hole, 6-Mating part, 7-Annular conical surface, 8-Annular conical head, 9-Through hole. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] Example

[0038] See Figure 1 and Figure 2 This embodiment proposes an insulating bushing with adjustable axial dimensions, including a first insulating bushing component 1 and a second insulating bushing component 2;

[0039] The end of the first insulating bushing component 1 near the second insulating bushing component 2 is sleeved onto the end of the second insulating bushing component 2 near the first insulating bushing component 1;

[0040] The first insulating bushing component 1 has a first washer 3 at the end away from the second insulating bushing component 2, and the first washer 3 and the first insulating bushing component 1 are integrally formed together.

[0041] The second insulating bushing component 2 has a second washer 4 at the end away from the first insulating bushing component 1, and the second washer 4 and the second insulating bushing component 2 are integrally formed together.

[0042] In use, insert the first insulating bushing component 1 through the mounting hole on one side of the equipment (not shown in the figure), and insert the second insulating bushing component 2 through the mounting hole on the other side of the equipment (not shown in the figure), so that the mating parts of the first insulating bushing component 1 and the second insulating bushing component 2 are nested together. After passing the screw of the fixing bolt through the center hole of the first insulating bushing component 1 and the second insulating bushing component 2, tighten the bolt to complete the installation.

[0043] The axially adjustable insulating bushing disclosed in this embodiment integrates the first washer 3 and the second washer 4 with the first insulating bushing component 1 and the second insulating bushing component 2, respectively. This effectively avoids insulation problems caused by improper size or installation fit at the overlap between the washer and the bushing. As a result, the axially adjustable insulating bushing has the beneficial effects of adapting to the on-site equipment docking size adjustment requirements, improving the stability of the bushing and washer fit, reducing the risk of insulation failure, ensuring the reliable performance of the insulation function of the connecting bolts, and effectively avoiding equipment overheating and short circuits.

[0044] See Figure 1 and Figure 2 The diameters of the first washer 3 and the second washer 4 are larger than those of the first insulating bushing component 1 and the second insulating bushing component 2. This allows the first washer 3 and the second washer 4 to form radial restraint and edge wrapping around the first insulating bushing component 1 and the second insulating bushing component 2, effectively limiting their displacement or detachment under vibration, impact and other working conditions, and enhancing the overall structural assembly stability and fatigue resistance. At the same time, it expands the insulation protection range, covering the edge gap between the bushing and adjacent components, reducing the risk of creepage, arc breakdown and other risks, and optimizing insulation and protection performance.

[0045] The first insulating bushing component 1 has a mating hole 5 inside its end near the second insulating bushing component 2, and the second insulating bushing component 2 has a mating part 6 at its end near the first insulating bushing component 1. The mating part 6 is slidably fitted into the mating hole 5. The mating hole 5 of the first insulating bushing component 1 and the slidably fitted mating part 6 of the second insulating bushing component 2 form a sliding fit. This provides axial adjustment margin, effectively compensates for assembly errors, thermal expansion and contraction and vibration stress, avoids cracking or loosening caused by rigid connection, and improves structural stability. It also prevents skew and wobbling through radial constraint, ensures overall coaxiality and structural integrity, and ensures reliable realization of insulation and isolation functions.

[0046] See Figure 1 and Figure 2The inner diameter of the mating hole 5 is equal to the diameter of the mating part 6. By making the inner diameter of the mating hole 5 equal to the diameter of the mating part 6 to form an interference fit, the mating hole 5 and the mating part 6 can achieve a tight and rigid connection. This structure can eliminate the gap between the two, avoid radial shaking or loosening caused by the gap, and significantly improve the structural stability and overall rigidity of the first insulating bushing component 1 and the second insulating bushing component 2 after docking. On the other hand, the tight interference fit can reduce the risk of external dust, moisture and other impurities entering through the docking gap, while ensuring the accurate maintenance of the coaxiality of the first insulating bushing component 1 and the second insulating bushing component 2, providing structural support for the long-term reliable performance of the insulation and isolation function.

[0047] The length of the mating hole 5 is adapted to the length of the mating part 6, so that the first insulating bushing component 1 and the second insulating bushing component 2 can achieve full-length fit when they are mated. The full-length fit structure maximizes the contact area between the mating hole 5 and the mating part 6, effectively disperses the stress on the mating surface, avoids wear or deformation of components caused by local stress concentration, and extends the service life of the structure. At the same time, the complete length fit can enhance the radial constraint effect, ensure that the first insulating bushing component 1 and the second insulating bushing component 2 always maintain stable coaxiality during axial sliding adjustment or long-term use, reduce the risk of misalignment caused by insufficient local mating length, and reduce the intrusion of external impurities through the mating gap, thus ensuring insulation performance.

[0048] See Figure 1 and Figure 2 The bottom of the mating hole 5 has an annular conical surface 7, and the end of the mating part 6 has an annular conical head 8. The annular conical head 8 is adapted to the annular conical surface 7, which makes the first insulating bushing component 1 and the second insulating bushing component 2 fit together more closely, increases the contact area, and improves the sealing and stability of the connection between the first insulating bushing component 1 and the second insulating bushing component 2.

[0049] The first insulating bushing component 1 and the second insulating bushing component 2 have coaxial through holes 9. The through holes 9 facilitate the thread of the fixing bolt through the through holes 9, and the bolt is tightened to complete the installation, thereby forming an insulating layer between the equipment and the fixing bolt.

[0050] See Figure 1 and Figure 2 The outer diameters of the first insulating bushing component 1 and the second insulating bushing component 2 are the same, which makes the insulating bushing more aesthetically pleasing and also facilitates the fitting of mounting holes on the equipment (not shown in the figure).

[0051] The first insulating bushing component 1 and the second insulating bushing component 2 are made of rigid insulating material or soft composite material. This arrangement allows the insulating bushing to flexibly select appropriate materials according to the scenario. Rigid materials ensure structural rigidity and resistance to deformation, while soft composite materials enhance adaptability to assembly errors and thermal expansion and contraction, both of which can meet the core insulation requirements.

[0052] See Figure 1 and Figure 2 The first insulating bushing component 1 and the second insulating bushing component 2 are columnar structures, which makes the overall shape regular and symmetrical, facilitating processing, manufacturing and standardized production. The columnar structure can provide uniform radial insulation thickness, ensuring consistent insulation performance in different directions and avoiding local insulation weaknesses. At the same time, the regular columnar shape is conducive to forming a stable fit with other components, simplifying the assembly process, improving installation efficiency, and can evenly distribute stress when under force, reducing stress concentration problems caused by structural irregularities, and ensuring long-term stable performance of insulation function.

[0053] See Figure 1 and Figure 2 In this embodiment, the first insulating bushing component 1 and the second insulating bushing component 2 may be made of epoxy insulating material, or they may be made of rubber or plastic composite material.

[0054] See Figure 1 and Figure 2 The specific working principle of the axially adjustable insulating bushing in this embodiment is as follows:

[0055] After assembly, the first insulating bushing component 1 and the second insulating bushing component 2 are installed as a whole in the flange fixing hole or bolt hole of the equipment. Through the structural cooperation between the two, a continuous insulating isolation layer is formed between the equipment shell and the fixing bolt, blocking the current conduction path between the equipment shell and the bolt. The inner diameter of the mating part 6 of the first insulating bushing component 1 is equal to the outer diameter of the mating part 6 of the second insulating bushing component 2, ensuring that the two form a tight fit. In the actual installation process, the mating nesting depth of the first insulating bushing component 1 and the second insulating bushing component 2 can be adaptively adjusted according to the actual depth requirements of the equipment installation hole. The nesting depth increases with the hole depth and decreases with the hole depth, thereby flexibly adapting to the different installation dimensions of different equipment and ensuring that the insulating bushing can effectively insulate the bolts under various working conditions.

[0056] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An insulating bushing with adjustable axial dimensions, characterized in that: It includes a first insulating bushing component (1) and a second insulating bushing component (2); The end of the first insulating bushing component (1) near the second insulating bushing component (2) is sleeved on the end of the second insulating bushing component (2) near the first insulating bushing component (1); The first insulating bushing component (1) has a first washer (3) at the end away from the second insulating bushing component (2), and the first washer (3) and the first insulating bushing component (1) are integrally formed together; The second insulating bushing component (2) has a second washer (4) at the end away from the first insulating bushing component (1), and the second washer (4) and the second insulating bushing component (2) are integrally formed together.

2. The axially adjustable insulating bushing according to claim 1, characterized in that: The diameters of the first washer (3) and the second washer (4) are larger than those of the first insulating bushing component (1) and the second insulating bushing component (2).

3. The axially adjustable insulating bushing according to claim 1, characterized in that: The first insulating bushing component (1) has a mating hole (5) inside one end near the second insulating bushing component (2), and the second insulating bushing component (2) has a mating part (6) at one end near the first insulating bushing component (1), and the mating part (6) is slidably adapted to the mating hole (5).

4. An insulating bushing with adjustable axial dimensions according to claim 3, characterized in that: The inner diameter of the docking hole (5) is equal to the diameter of the docking part (6).

5. An axially adjustable insulating bushing according to claim 3, characterized in that: The length of the docking hole (5) is adapted to the length of the docking part (6).

6. An insulating bushing with adjustable axial dimensions according to claim 3, characterized in that: The bottom of the docking hole (5) has an annular conical surface (7), and the end of the docking part (6) has an annular conical head (8), which is adapted to the annular conical surface (7).

7. An insulating bushing with adjustable axial dimensions according to claim 1, characterized in that: The first insulating bushing component (1) and the second insulating bushing component (2) have coaxial through holes (9).

8. An insulating bushing with adjustable axial dimensions according to claim 1, characterized in that: The outer diameters of the first insulating bushing component (1) and the second insulating bushing component (2) are the same.

9. An insulating bushing with adjustable axial dimensions according to claim 1, characterized in that: The first insulating bushing component (1) and the second insulating bushing component (2) are made of rigid insulating material or soft composite material.

10. An insulating bushing with adjustable axial dimensions according to claim 1, characterized in that: The first insulating bushing component (1) and the second insulating bushing component (2) are columnar structures.

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