A bushing for a power capacitor

Abstract

The utility model belongs to capacitor bush technical field especially relates to a bush for power capacitor, include: bush body, the bush body lower extreme is installed with the connecting disc, the connecting disc lower extreme is detachably installed with the fixed ring, the fixed ring lower extreme is used for connecting with capacitor body, the bush body upper end is provided with the wiring guide post of penetrating, and the wiring guide post and bush body between keep insulating cooperation, the connecting disc lower extreme is installed with the stranded wire, the lower end surface of connecting disc is installed with annular sealing washer no. 1 and annular sealing washer no. 2, annular sealing washer no. 1 and annular sealing washer no. 2 along the axis of connecting disc are concentric ring distribution, annular sealing washer no. 2 and annular sealing washer no. 1 all are inlayed and are inserted into the fixed ring, the inner chamber of fixed ring is filled with sealing oil. The utility model has the advantages of being convenient for bush body installation and dismounting, and the connecting gap between bush body and capacitor body can be sealed.

Description

Technical Field

[0001] This utility model belongs to the field of capacitor sleeve technology, and particularly relates to a sleeve for power capacitors. Background Technology

[0002] The bushing of a power capacitor is an important component. It is an insulating part that passes through the capacitor casing and reliably leads the electrode leads of the internal components to the outside for electrical connection. It not only ensures smooth current conduction but, more importantly, provides insulation under high voltage, effectively preventing breakdown and short circuits between the live electrodes and the grounded capacitor casing. Bushings are typically installed on power capacitors via welding or flange connections.

[0003] Chinese patent discloses a capacitor (authorization announcement number CN205680549U). The patent technology mainly includes: a housing that houses the capacitor element; and an insulating sleeve that includes a lead-out terminal and a body. The lead-out terminal is fixed to the upper end of the body by high-frequency welding, and the lower end of the body is fixed to the upper cover of the housing by high-frequency welding. The lower end of the body is electrically connected to the capacitor element.

[0004] However, existing technologies have the following problems when used: Firstly, existing sleeves are usually installed by welding or flange connection. When using welding, it is inconvenient to install and disassemble the sleeve. When using flange connection, multiple bolts need to be installed and disassembled, which is time-consuming and labor-intensive. Secondly, the current connection is made using flanges, which creates a large gap between the sleeve flange and the power capacitor flange, allowing external moisture, dust, and other impurities to enter the power capacitor, resulting in poor sealing. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned technical problems by providing a bushing for power capacitors, which facilitates the installation and disassembly of the bushing body and seals the connection gap between the bushing body and the capacitor body.

[0006] In view of this, the present invention provides a bushing for a power capacitor, comprising: The sleeve body has a connecting plate installed at its lower end, and a fixing ring is detachably installed at the lower end of the connecting plate. The lower end of the fixing ring is used to connect with the capacitor body. A wiring guide rod is provided through the upper end of the sleeve body, and the wiring guide rod is insulated from the sleeve body. A stranded wire is installed at the lower end of the connecting plate, and the top end of the stranded wire extends into the sleeve body to electrically connect with the wiring guide rod. The end of the stranded wire away from the connecting plate passes through the capacitor body and extends into the inner cavity of the capacitor body. An annular sealing gasket one and an annular sealing gasket two are installed on the lower end face of the connecting plate. The annular sealing gasket one and the annular sealing gasket two are distributed in concentric rings along the axis of the connecting plate. The annular sealing gasket one and the annular sealing gasket two are both fitted into the fixing ring. The inner cavity of the fixing ring is filled with sealing oil. The sealing oil fills the sealing space formed by the annular sealing gasket one, the annular sealing gasket two and the inner wall of the fixing ring, and is used to seal the gap between the connecting plate and the capacitor body.

[0007] Furthermore, an annular disk one is sleeved on the outer wall of the fixing ring, and an annular screw groove is opened at the upper end of the annular disk one. An annular disk two is sleeved on the outer wall of the connecting disk, and a threaded ring is fixed at the lower end of the annular disk two, and the threaded ring extends into the annular screw groove for threaded connection.

[0008] Furthermore, a spring is fixed to the lower end of the connecting plate, and the bottom end of the spring is set to fit against the upper end of the capacitor body.

[0009] Furthermore, a through hole is provided at the upper end of the capacitor body, and the through hole is connected to the inner cavity of the capacitor body. The bottom end of the stranded wire passes through the through hole and extends into the inner cavity of the capacitor body.

[0010] Furthermore, the through hole at the upper end of the capacitor body is coaxial with the vertical axis of the stranded wire.

[0011] Furthermore, the upper end of the fixing ring is provided with an annular sealing groove 2, the upper end of the fixing ring is provided with an annular sealing groove 1, the annular sealing gasket 1 is fitted into the annular sealing groove 1, and the annular sealing gasket 2 is fitted into the annular screw groove.

[0012] Furthermore, an annular holding groove is provided at the upper end of the fixing ring, and a pipe is installed on the side wall of the fixing ring, and the pipe is connected to the annular holding groove.

[0013] Furthermore, a control valve is installed at the upper end of the pipe.

[0014] Compared with the prior art, the bushing for power capacitors described in this utility model has the following advantages: When the sleeve body needs to be installed, the threaded ring is inserted into the annular threaded groove for threaded connection. At the same time, the spring is elastically compressed, and the bottom end of the stranded wire passes through the through hole and extends into the inner cavity of the capacitor body. Annular sealing gasket one is inserted into annular sealing groove one, and annular sealing gasket two is inserted into annular sealing groove two. Then, sealing oil is introduced into the annular holding groove through the pipe. This achieves the effect of facilitating the installation and disassembly of the sleeve body, and at the same time, sealing the connection gap between the sleeve body and the capacitor body. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a top view of the capacitor body of this utility model; Figure 4 This is a cross-sectional view of the connection between the fixing ring and the annular disk of this utility model; Figure 5 This is a cross-sectional view of the connection between the fixing ring, the connecting disc, and the sleeve body of this utility model; Figure 6 This is the utility model Figure 5 Enlarged view of point A; Figure 7 This is a cross-sectional view of the connection between the connecting disc and the sleeve body of this utility model; Figure 8 This is the utility model Figure 7 Enlarged view of point B; The markings in the diagram are as follows: 1. Capacitor body; 2. Fixing ring; 3. Connecting disc; 4. Sleeve body; 5. Wiring guide rod; 6. Stranded wire; 7. Through hole; 8. Annular holding groove; 9. Pipe; 10. Annular disc one; 11. Annular threaded groove; 12. Annular sealing groove one; 13. Annular sealing groove two; 14. Spring; 15. Annular sealing gasket one; 16. Annular disc two; 17. Threaded ring; 18. Annular sealing gasket two. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0017] It should be noted that all directional and positional terms used in this utility model, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connection arrangements between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0018] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0020] Please see Figures 1 to 8 The embodiments provided by this utility model are as follows: Example: A bushing for a power capacitor, comprising: The sleeve body 4 has a connecting plate 3 installed at its lower end. A fixing ring 2 is detachably installed at the lower end of the connecting plate 3. The lower end of the fixing ring 2 is used to connect with the capacitor body 1. A wiring guide rod 5 is provided through the upper end of the sleeve body 4, and the wiring guide rod 5 and the sleeve body 4 are insulated from each other. A stranded wire 6 is installed at the lower end of the connecting plate 3, and the top end of the stranded wire 6 extends into the sleeve body 4 to electrically connect with the wiring guide rod 5. The end of the stranded wire 6 away from the connecting plate 3 passes through the capacitor body 1 and extends into the inner cavity of the capacitor body 1. An annular sealing gasket 15 and an annular sealing gasket 2 18 are installed on the lower end face of the connecting plate 3. The annular sealing gasket 15 and the annular sealing gasket 2 18 are distributed in concentric rings along the axis of the connecting plate 3. The annular sealing gasket 2 18 and the annular sealing gasket 15 are both fitted into the fixing ring 2. The inner cavity of the fixing ring 2 is filled with sealing oil. The sealing oil fills the sealing space formed by the annular sealing gasket 15, the annular sealing gasket 2 18 and the inner wall of the fixing ring 2, and is used to seal the gap between the connecting plate 3 and the capacitor body 1.

[0021] In the example of this application, the stranded wire 6 installed at the lower end of the connecting plate 3 serves to electrically connect the connecting rod 5 to the inner cavity of the capacitor body 1. The top end of the stranded wire 6 extends into the sleeve body 4 and is electrically connected to the connecting rod 5, while the end away from the connecting plate 3 passes through the capacitor body 1 and extends into its inner cavity. This not only ensures that the power can be stably and efficiently transmitted from the connecting rod 5 to the inside of the capacitor body 1, but also that the stranded wire 6 itself has a certain degree of flexibility, which can adapt to certain vibrations and displacements during installation and use, reducing the risk of component damage caused by rigid connections. The annular sealing gaskets 15 and 18, mounted on the lower end face of the connecting plate 3, play a crucial role. They are concentrically arranged along the axis of the connecting plate 3, forming a sealing barrier and improving sealing reliability. Both annular sealing gaskets 15 and 18 are fitted into the fixing ring 2, resulting in a tighter fit between the gaskets and the fixing ring 2, effectively blocking the intrusion of external impurities and moisture. Simultaneously, the inner cavity of the fixing ring 2 is filled with sealing oil, which fills the sealing space formed by the annular sealing gaskets 15 and 18 and the inner wall of the fixing ring 2. This sealing oil fully fills the tiny gaps within the sealing space, further enhancing the sealing effect and providing a comprehensive and effective seal between the connecting plate 3 and the capacitor body 1. This prevents external humid air and dust from entering the capacitor body 1, ensuring the normal operation of the capacitor and extending its service life.

[0022] Furthermore, an annular disc 10 is sleeved on the outer wall of the fixing ring 2. An annular screw groove 11 is opened at the upper end of the annular disc 10. An annular disc 2 16 is sleeved on the outer wall of the connecting disc 3. A threaded ring 17 is fixed at the lower end of the annular disc 2 16, and the threaded ring 17 extends into the annular screw groove 11 for threaded connection.

[0023] As a preferred example of this utility model, the annular disc 10, which is sleeved on the outer wall of the retaining ring 2, has an annular threaded groove 11 at its upper end providing an assembly position for connection. The annular disc 16, which is sleeved on the outer wall of the connecting disc 3, has a threaded ring 17 fixed at its lower end that can extend into the annular threaded groove 11 to achieve a threaded connection. The threaded connection method features a strong connection and convenient disassembly. During installation, by rotating the connecting disc 3 or the retaining ring 2, the threaded ring 17 can be gradually tightened within the annular threaded groove 11, thereby making the fit between the connecting disc 3 and the retaining ring 2 tighter, effectively eliminating the gap between them and reducing the risk of seal failure due to loose connection.

[0024] Furthermore, the mating structure of the annular disc 10, annular disc 2 16, and threaded ring 17 provides a certain degree of protection for the connection between the connecting disc 3 and the fixing ring 2, preventing direct impact from external mechanical collisions and thus protecting the connection structure from damage. Simultaneously, it provides better support for the subsequent installation of sealing components, enabling the annular sealing gasket 15 and annular sealing gasket 2 18 to perform their sealing function more stably, further improving the overall sealing reliability of the bushing and ensuring the stability of the capacitor during long-term operation.

[0025] Furthermore, a spring 14 is fixed to the lower end of the connecting plate 3, and the bottom end of the spring 14 is attached to the upper end of the capacitor body 1.

[0026] As a preferred example of this utility model, when the sleeve body 4 needs to be disassembled for maintenance or replacement, the operator first applies a rotational force to the sleeve body 4. Since the sleeve body 4 is connected to the connecting disc 3, the connecting disc 3 will rotate synchronously with the rotation of the sleeve body 4. At this time, the threaded ring 17 fixed at the lower end of the annular disc 16 sleeved on the outer wall of the connecting disc 3 will undergo relative spiral movement within the annular threaded groove 11 opened at the upper end of the annular disc 10 sleeved on the outer wall of the fixing ring 2. As the rotation operation continues, the threaded ring 17 gradually exits from the annular threaded groove 11, releasing the connection limit for the upward movement of the sleeve body 4.

[0027] As the threaded ring 17 gradually moves out of the annular threaded groove 11, the spring 14 fixed at the lower end of the connecting disc 3 begins to elastically deform. When the sleeve body 4 is not disassembled, the spring 14 is in a compressed state, with its bottom end attached to the upper end of the capacitor body 1, storing a certain amount of elastic potential energy. As the threaded connection constraint between the threaded ring 17 and the annular threaded groove 11 gradually weakens until it disappears, the elastic potential energy stored in the spring 14 begins to release, pushing the connecting disc 3 upwards. The sleeve body 4, being fixedly connected to the connecting disc 3, moves upwards synchronously under the influence of the connecting disc 3. The upward pushing force generated by the elastic deformation of the spring 14 effectively assists the operator in separating the sleeve body 4 from the assembly structure of the fixing ring 2 and the capacitor body 1, avoiding disassembly difficulties caused by excessive tightness or slight adhesion between components after long-term use. It eliminates the need for the operator to apply a large upward pulling force, significantly reducing the labor intensity of the disassembly operation.

[0028] Furthermore, a through hole 7 is provided at the upper end of the capacitor body 1, and the through hole 7 is connected to the inner cavity of the capacitor body 1. The bottom end of the stranded wire 6 passes through the through hole 7 and extends into the inner cavity of the capacitor body 1.

[0029] As a preferred example of this utility model, the bottom end of the stranded wire 6 passes through the through hole 7 and extends into the inner cavity of the capacitor body 1. The through hole 7 allows the stranded wire 6 to extend into the inside of the capacitor body 1 along a fixed path during installation, avoiding the stranded wire 6 from shifting or misaligning during installation. This ensures that the stranded wire 6 can be accurately connected to the corresponding component in the inner cavity of the capacitor body 1, guaranteeing the smoothness of power transmission.

[0030] Meanwhile, the through hole 7 also provides some protection for the stranded wire 6, preventing it from rubbing against the edge of the capacitor body 1 during use. This prevents damage to the insulation or conductor of the stranded wire 6 due to friction, thereby reducing the risk of power transmission failure. Furthermore, the through hole 7 connects to the inner cavity of the capacitor body 1, allowing the stranded wire 6 to directly connect to the core components inside the capacitor. This shortens the power transmission path, reduces power loss during transmission, and improves the capacitor's operating efficiency.

[0031] Furthermore, the through hole 7 at the upper end of the capacitor body 1 is coaxial with the vertical axis of the stranded wire 6.

[0032] As a preferred example of this utility model, when the through hole 7 and the stranded wire 6 are coaxial with the vertical axis, the stranded wire 6 can always remain in the center position during the process of passing through the through hole 7, avoiding unnecessary friction and compression between the stranded wire 6 and the inner wall of the through hole 7, reducing the possibility of damage to the stranded wire 6, and especially for the insulation layer of the stranded wire 6, it can effectively protect its integrity and prevent leakage accidents caused by insulation layer damage. In addition, the coaxial line ensures that the stranded wire 6 can accurately mate with the connecting parts in the inner cavity after it extends into the inner cavity of the capacitor body 1, avoiding poor connection problems caused by the misalignment of the stranded wire 6, and ensuring the stability and efficiency of power transmission.

[0033] Furthermore, the upper end of the fixing ring 2 is provided with an annular sealing groove 2 13, the upper end of the fixing ring 2 is provided with an annular sealing groove 12, the annular sealing gasket 15 is fitted into the annular sealing groove 12, and the annular sealing gasket 2 18 is fitted into the annular screw groove 11.

[0034] As a preferred example of this utility model, the configuration of the annular sealing groove 12 and the annular sealing groove 13 provides installation and positioning space for the annular sealing gasket 15 and the annular sealing gasket 18, enabling the sealing gasket to be accurately and stably installed on the fixing ring 2, avoiding the sealing gasket from shifting or misaligning during installation, and ensuring a tight fit between the sealing gasket and the fixing ring 2. When the annular sealing gasket 15 is fitted into the annular sealing groove 12 and the annular sealing gasket 28 is fitted into the annular sealing groove 23, the sidewalls of the sealing grooves effectively limit the gaskets, preventing them from shifting under pressure or vibration, thus ensuring the stability of the sealing effect. Simultaneously, the sealing grooves increase the contact area between the gasket and the retaining ring 2, allowing the gasket to more fully fill the gaps in the sealing area, further enhancing the sealing performance. This effectively prevents external moisture, dust, and other impurities from entering the sleeve, and also prevents leakage of sealing oil from the inner cavity of the retaining ring 2, ensuring the normal operating environment of the internal components of the sleeve and extending its service life.

[0035] In addition, the mating structure of the sealing groove and the sealing gasket makes installation and disassembly more convenient. Simply remove or insert the sealing gasket from the sealing groove, which facilitates the replacement and maintenance of the sealing gasket and reduces the cost and difficulty of later maintenance.

[0036] Furthermore, an annular holding groove 8 is provided at the upper end of the fixing ring 2, and a pipe 9 is installed on the side wall of the fixing ring 2, and the pipe 9 is connected to the annular holding groove 8.

[0037] As a preferred example of this utility model, the annular holding groove 8 serves as a storage space for sealing oil, capable of holding a certain amount of sealing oil, ensuring that the sealing oil can fully fill the sealing space formed by the annular sealing gasket 15, the annular sealing gasket 28, and the inner wall of the fixing ring 2, thereby achieving effective sealing. The connection between pipe 9 and the annular reservoir 8 allows workers to inject sealing oil into the annular reservoir 8 through pipe 9. During installation, the filling operation can be completed without disassembling components such as the fixing ring 2, greatly simplifying the installation process and improving efficiency. During long-term use of the sleeve, if the sealing oil is depleted or deteriorates, workers can also drain the old sealing oil from the annular reservoir 8 through pipe 9 and inject new sealing oil, thus replenishing and replacing the sealing oil. This ensures the sealing effect remains optimal and prevents seal failure due to insufficient or deteriorated sealing oil.

[0038] Furthermore, a control valve is installed at the upper end of pipe 9.

[0039] As a preferred example of this utility model, the control valve is configured to control the opening and closing of the pipe 9. When injecting sealing oil into the annular holding tank 8, the operator can open the control valve to allow the sealing oil to flow smoothly into the annular holding tank 8 through the pipe 9. When the sealing oil is filled to an appropriate amount, the control valve is closed to prevent the sealing oil from continuing to flow in, thus avoiding leakage and waste and pollution. At the same time, it can also ensure that the liquid level of the sealing oil in the annular holding tank 8 is kept within a reasonable range to ensure the sealing effect. The control valve also plays a crucial role during the replenishment or replacement of sealing oil. When it is necessary to drain the old sealing oil, the control valve is opened, allowing the old sealing oil to drain through pipe 9. After draining, the control valve is closed, and new sealing oil is then injected. This effectively prevents external impurities from entering the annular collection tank 8 during operation, thus preventing contamination of the sealing oil and the internal environment of the casing. Furthermore, when the casing is operating normally, the control valve is in the closed state, effectively preventing leakage of sealing oil from the annular collection tank 8 through pipe 9, ensuring the sufficiency of sealing oil and guaranteeing stable sealing performance.

[0040] In this embodiment, when installing the bushing body 4 of the power capacitor, the operator first aligns the threaded ring 17 at the lower end of the annular disk 16 corresponding to the connecting disk 3 at the lower end of the bushing body 4 with the annular groove 11 opened at the upper end of the annular disk 10 on the outer wall of the fixing ring 2. Then, downward pressure is applied to the bushing body 4 and rotated synchronously, so that the threaded ring 17 is gradually screwed into the annular groove 11, thereby realizing the threaded connection between the connecting disk 3 and the fixing ring 2. As the threaded ring 17 is screwed into the annular threaded groove 11, the spring 14 fixed at the lower end of the connecting disc 3 gradually contacts and compresses the upper end of the capacitor body 1, resulting in elastic compression. The elastic compression of the spring 14 not only provides a buffer for the downward movement of the sleeve body 4, but also prevents hard impact damage to the connecting disc 3 or the upper end of the capacitor body 1 due to excessive pressure during installation. Simultaneously, as the bushing body 4 moves downwards synchronously with the connecting plate 3, the stranded wire 6 installed at the lower end of the connecting plate 3 also moves downwards. Its bottom end passes through the through hole 7 opened at the upper end of the capacitor body 1 and extends into the inner cavity of the capacitor body 1. Since the through hole 7 and the stranded wire 6 are coaxial with each other, the stranded wire 6 will not deviate or get stuck during the process of passing through the through hole 7, and can smoothly connect with the corresponding component in the inner cavity of the capacitor body 1, ensuring the stable and smooth flow of the subsequent power transmission channel and avoiding power transmission failures caused by misalignment of the stranded wire 6. As the connecting disc 3 continues to move downwards until it comes into contact with the upper surface of the fixing ring 2, the annular sealing gasket 15 and annular sealing gasket 28 installed on the lower surface of the connecting disc 3 will align with the annular sealing groove 12 and annular sealing groove 23 respectively opened at the upper end of the fixing ring 2, and under the pressure of the downward movement of the connecting disc 3, they will fit into the corresponding sealing grooves. The tight fit of annular sealing gasket 15 with annular sealing groove 12 and the tight fit of annular sealing gasket 28 with annular sealing groove 23 form a sealing structure. The seal can effectively prevent moisture, dust and other impurities in the external air from entering the interior of the fixing ring 2, and at the same time create a sealed space for the subsequent filling of sealing oil, ensuring that the sealing oil can fully exert its sealing function. Workers slowly introduce sealing oil into the annular reservoir 8 at the upper end of the fixed ring 2 through the pipe 9 installed on the side wall of the fixed ring 2. Since the annular reservoir 8 is connected to the sealing space inside the fixed ring 2, the sealing oil gradually fills the entire sealing space under gravity, namely the area formed by the annular sealing gasket 15, the annular sealing gasket 2 18, and the inner wall of the fixed ring 2. The filling of the sealing oil not only enhances the sealing effect and fills any tiny gaps between the sealing components through the oil film, but also provides some rust protection for the metal components at the connection points, extending their service life. During this process, a control valve is installed at the upper end of the pipe 9. Workers can adjust the control valve to control the introduction speed and amount of sealing oil, avoiding overflow and waste, while ensuring that the sealing oil level in the annular reservoir 8 is maintained within a reasonable range to achieve the best sealing effect. Throughout the installation process, the threaded connection between the threaded ring 17 and the annular threaded groove 11 provides a basic installation and fixation for the bushing body 4. The elastic compression of the spring 14 provides buffering and pre-tightening for the installation. The stranded wire 6 passing through the through hole 7 ensures unobstructed power transmission. The fitting of the annular sealing gasket and the annular sealing groove provides a structural basis for sealing. The introduction of sealing oil into the pipe 9 completes the final construction of the sealing system. The coordinated operation between the various structural components not only makes the installation process clear, convenient, and efficient, but also ensures the overall stability, sealing performance, and power transmission reliability of the bushing after installation, fully demonstrating the scientific and practical nature of the bushing structure design. This achieves the effect of facilitating the installation and disassembly of the bushing body 4 while sealing the connection gap between the bushing body 4 and the capacitor body 1.

[0041] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A bushing for a power capacitor, characterized in that, include: The sleeve body (4) has a connecting plate (3) installed at its lower end. A fixing ring (2) is detachably installed at the lower end of the connecting plate (3). The lower end of the fixing ring (2) is used to connect with the capacitor body (1). A wiring guide (5) is provided through the upper end of the sleeve body (4). The wiring guide (5) and the sleeve body (4) are kept insulated from each other. A stranded wire (6) is installed at the lower end of the connecting plate (3). The top end of the stranded wire (6) extends into the sleeve body (4) and is electrically connected to the wiring guide (5). The end of the stranded wire (6) away from the connecting plate (3) passes through the capacitor body (1) and extends into the inner cavity of the capacitor body (1). An annular sealing gasket assembly is installed on the lower end face of the connecting plate (3). The annular sealing gasket assembly is fitted into the fixing ring (2). The inner cavity of the fixing ring (2) is filled with sealing oil. The sealing oil fills the sealing space formed by the annular sealing gasket assembly and the inner wall of the fixing ring (2) to seal the gap between the connecting plate (3) and the capacitor body (1).

2. A bushing for a power capacitor according to claim 1, characterized in that, The annular sealing gasket assembly includes annular sealing gasket one (15) and annular sealing gasket two (18), both of which are fitted into the fixing ring (2).

3. A bushing for a power capacitor according to claim 2, characterized in that, The first annular sealing gasket (15) and the second annular sealing gasket (18) are arranged in concentric rings along the axis of the connecting disc (3).

4. A bushing for a power capacitor according to claim 1, characterized in that, The outer wall of the fixed ring (2) is fitted with an annular disk one (10), the upper end of the annular disk one (10) is provided with an annular screw groove (11), the outer wall of the connecting disk (3) is fitted with an annular disk two (16), the lower end of the annular disk two (16) is fixed with a threaded ring (17), and the threaded ring (17) extends into the annular screw groove (11) for threaded connection.

5. A bushing for a power capacitor according to claim 4, characterized in that, A spring (14) is fixed at the lower end of the connecting plate (3), and the bottom end of the spring (14) is attached to the upper end of the capacitor body (1).

6. A bushing for a power capacitor according to claim 5, characterized in that, The capacitor body (1) has a through hole (7) at its upper end, and the through hole (7) is connected to the inner cavity of the capacitor body (1). The bottom end of the stranded wire (6) passes through the through hole (7) and extends into the inner cavity of the capacitor body (1).

7. A bushing for a power capacitor according to claim 6, characterized in that, The through hole (7) at the upper end of the capacitor body (1) is coaxial with the vertical axis of the stranded wire (6).

8. A bushing for a power capacitor according to claim 7, characterized in that, The upper end of the fixed ring (2) is provided with an annular sealing groove 2 (13) and the upper end of the fixed ring (2) is provided with an annular sealing groove 1 (12). The annular sealing gasket 1 (15) is fitted into the annular sealing groove 1 (12) and the annular sealing gasket 2 (18) is fitted into the annular screw groove (11).

9. A bushing for a power capacitor according to claim 1, characterized in that, The upper end of the fixed ring (2) is provided with an annular holding groove (8), and a pipe (9) is installed on the side wall of the fixed ring (2), and the pipe (9) is connected to the annular holding groove (8).

10. A bushing for a power capacitor according to claim 9, characterized in that, A control valve is installed at the upper end of the pipe (9).

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