A sealing device for GIS bolted connections

Abstract

This utility model relates to a sealing device for GIS bolt connections, comprising: a sleeve and a connecting rod. Both ends of the sleeve are equipped with sealing elements. The sleeve is fitted over the GIS bolt and GIS nut 11. One end of the connecting rod passes through one end of the sleeve and is used to connect with the GIS bolt. The other end of the connecting rod is connected to a locking assembly. By setting up a sleeve and providing sealing elements at both ends, the GIS bolt and GIS nut are fitted inside the sleeve, and the remaining portion of the GIS bolt is connected to the connecting rod and locked in place by the locking assembly, forming a stable sealing structure. This eliminates the need for power outages and pressure relief of the GIS equipment to address air leakage at the GIS bolt connection, fundamentally solving the drawback of traditional leak handling requiring equipment shutdown (e.g., causing a complete wind farm shutdown) and avoiding significant economic losses caused by unplanned power outages. Simultaneously, it extends equipment operating time, creating conditions for the site to conduct planned maintenance at appropriate times.

Description

Technical Field

[0001] This utility model relates to the field of power maintenance equipment technology, specifically to a sealing device for GIS bolt connections. Background Technology

[0002] Gas-insulated switchgear (GIS) has become a core component of modern power systems due to its compact structure, high reliability, and minimal susceptibility to environmental influences. The GIS is filled with pressurized SF6 (sulfur hexafluoride) gas as an insulating and arc-quenching medium, and its normal operation is crucial for ensuring the safety and stability of the power grid.

[0003] However, during long-term operation, GIS equipment may leak SF6 gas due to vibration, thermal expansion and contraction, aging of sealing materials, and installation defects. Traditional leak handling requires a series of complex operations, including power outage, SF6 venting, gas recovery, welding or component replacement, vacuuming, and refilling, typically taking 2-3 days. For wind farm GIS equipment, a power outage means a complete shutdown, resulting in significant economic losses. Furthermore, if leaks are not addressed promptly, they can lead to a decline in equipment insulation performance, potentially causing major power outages.

[0004] Therefore, there is an urgent need for a live-lined and pressurized sealing device for leaks at the bolt connections of various sealing surfaces of GIS equipment. This device should be able to quickly and semi-permanently seal leaks without interrupting power or depressurizing the equipment, thereby reducing the risk of leaky operation of GIS equipment and avoiding power grid company electricity assessments due to unauthorized shutdowns of GIS equipment. After sealing, the operating time can be extended, allowing the station to choose an appropriate time to carry out planned maintenance and reduce downtime losses. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a sealing device that can plug the leaks at the connecting bolts of various sealing surfaces of GIS equipment without interrupting power supply or depressurization.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A sealing device for GIS bolt connection includes: a sleeve and a connecting rod. Both ends of the sleeve are provided with sealing elements. The sleeve is used to fit around the outside of the GIS bolt and GIS nut. One end of the connecting rod passes through one end of the sleeve and is used to connect with the GIS bolt. The other end of the connecting rod is connected to a locking assembly. The sealing element at one end of the sleeve is in sealing cooperation with the connecting rod. The sealing element at the other end of the sleeve is used to seal with the sealing surface of the GIS equipment.

[0007] The beneficial effects of this utility model are as follows: By setting a sleeve and providing sealing elements at both ends of the sleeve, the GIS bolts and GIS nuts are fitted inside the sleeve, and the remaining portion of the GIS bolts is connected to the connecting rod and locked in place by a locking assembly. This ensures that the sealing element at one end of the sleeve seals against the connecting rod, and the sealing element at the other end seals against the sealing surface of the GIS equipment, thus forming a stable sealing structure. This eliminates the need to shut down or depressurize the GIS equipment to address air leaks at the GIS bolt connections, fundamentally solving the drawback of traditional leak handling methods that require equipment shutdown (e.g., causing a complete wind farm shutdown) and avoiding significant economic losses caused by unplanned power outages. Simultaneously, it extends equipment operating time, creating conditions for the site to conduct planned maintenance at appropriate times.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the sleeve has sealing grooves at both ends, and the sealing element is placed in the corresponding sealing groove.

[0010] The beneficial effects of adopting the above-mentioned further solution are as follows: By setting sealing grooves at both ends of the sleeve, space is provided for the installation and positioning of the seal, preventing the seal from shifting or falling off during installation or equipment operation vibration, ensuring that the seal is always in the correct sealing position and guaranteeing the sealing effect. At the same time, during the subsequent tightening process, the sealing grooves can guide the seal to deform uniformly, further filling the gaps in the sealing surface and improving the ability to block gas leakage.

[0011] Furthermore, the sealing element is a rubber ring.

[0012] The beneficial effects of adopting the above-mentioned further solution are as follows: the sealing element is a rubber ring, which has excellent elasticity and deformation capacity. When compressed, it can tightly fit the end face of the sleeve and the sealing surface of the GIS equipment or the surface of the clamping part, fully filling the tiny gaps and effectively blocking SF6 gas leakage. At the same time, the rubber material is resistant to SF6 gas corrosion, resistant to certain temperature changes (adapting to thermal expansion and contraction during equipment operation), and has good aging resistance, which can maintain the sealing performance for a long time, matching the needs of long-term operation of GIS equipment and reducing the trouble of frequent replacement of sealing elements.

[0013] Furthermore, a first hole is provided at one end of the sleeve, and a second hole is provided at the other end of the sleeve, with the first hole communicating with the second hole.

[0014] The beneficial effects of adopting the above-mentioned further solution are: the first hole and the second hole at both ends of the sleeve are connected, providing a through-type installation channel for the connecting rod, ensuring that one end of the connecting rod can be smoothly inserted into the sleeve and connected to the GIS bolt, and the other end can extend out of the sleeve to cooperate with the locking component, thus successfully achieving the sealing effect of "bolt connection - sleeve sealing - external locking".

[0015] Furthermore, the diameter of the second hole is larger than the diameter of the first hole.

[0016] The beneficial effect of adopting the above-mentioned further solution is that setting the diameter of the second hole to be larger than that of the first hole adapts to the connection requirements of the overall device and the GIS bolt. The end of the second hole forms a receiving space. When one end of the connecting rod is connected to the GIS bolt (if the size of the connection part (such as the GIS nut or the connection washer) is large), the second hole can accommodate the connection part, thereby allowing the GIS bolt to be smoothly inserted into one end of the sleeve and connected to the connecting rod, avoiding structural interference between the end face of the sleeve and the GIS bolt nut, etc., and ensuring the smooth installation of the sealing device.

[0017] Furthermore, the connecting rod passes through the first hole.

[0018] The beneficial effects of adopting the above-mentioned further solution are as follows: the connecting rod is inserted into the first hole with a smaller diameter, which can reduce the gap between the connecting rod and the sleeve, prevent the connecting rod from shaking inside the sleeve, ensure the positioning effect of the connecting rod on the sleeve (so that the seals at both ends of the sleeve can accurately fit the sealing surface), and improve the stability of the sealing structure; the smaller gap between the first hole and the connecting rod can reduce the risk of SF6 gas leakage from the gap between the connecting rod and the first hole, forming "double protection" with the seals at both ends of the sleeve, and further improving the overall sealing effect.

[0019] Furthermore, one end of the connecting rod is provided with an internal threaded hole, and the GIS bolt is threadedly connected to the internal threaded hole.

[0020] The beneficial effects of adopting the above-mentioned further solution are: the threaded connection between the internal threaded hole and the GIS bolt enables a reliable connection between the connecting rod and the bolt. This connection method has high connection strength and is detachable. It can not only ensure the fixing effect of the connecting rod on the sleeve (avoiding sleeve displacement), but also facilitate the disassembly of the sealing device during subsequent maintenance, thus providing high flexibility.

[0021] Furthermore, it also includes a clamping component, which is sleeved outside the connecting rod and abuts against the sealing component at one end of the sleeve.

[0022] The beneficial effects of adopting the above-mentioned further solution are: the clamping component is sleeved outside the connecting rod and abuts against the sealing component at one end of the sleeve, which can evenly transmit the locking force of the locking assembly to the sealing component, so that the sealing component undergoes uniform deformation, fully fills the gap of the sealing surface, avoids leakage caused by the sealing component not being pressed in a certain area, and improves the sealing reliability.

[0023] Furthermore, the locking assembly includes a washer and a locking nut, the washer abutting against the clamping member, the outer side wall of the other end of the connecting rod is provided with an external thread, and the locking nut is threadedly connected to the other end of the connecting rod and abutting against the washer.

[0024] The beneficial effects of adopting the above-mentioned further solutions are as follows: the setting of the gasket can increase the contact area between the locking nut and the clamping part, avoid the locking nut directly damaging the clamping part, and at the same time, the pressure of the locking nut is evenly transmitted to the clamping part, thereby making the sealing part evenly stressed and ensuring the sealing effect; the threaded connection between the locking nut and the external thread of the connecting rod allows the locking force to be controlled and disassembled, which can not only ensure the long-term stability of the sealing device (avoiding loosening that leads to sealing failure), but also facilitate subsequent adjustment or disassembly, making the operation flexible.

[0025] Furthermore, the outer diameter of the clamping member is greater than or equal to the outer diameter of the sleeve.

[0026] The beneficial effects of adopting the above-mentioned further solution are: the outer diameter of the clamping part is greater than or equal to the outer diameter of the sleeve, which allows the clamping range of the clamping part to cover the entire sealing part (avoiding the sealing edge not being clamped due to the outer diameter of the clamping part being too small, thus forming a leakage channel), ensuring that the sealing part is subjected to uniform force and sufficient deformation, and improving the sealing reliability. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the sealing device of this utility model (showing the connection and installation with GIS bolts).

[0028] Figure 2 This is a schematic diagram showing the fit between the sleeve and the connecting rod of the sealing device of this utility model;

[0029] Figure 3 This is a schematic diagram of the sleeve structure of the sealing device of this utility model.

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 1. Sleeve; 2. Connecting rod; 3. Seal; 4. Sealing groove; 5. Internal threaded hole; 6. Clamping part; 7. Gasket; 8. Locking nut; 9. GIS bolt; 10. GIS equipment sealing surface; 11. GIS nut. Detailed Implementation

[0032] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0033] like Figures 1-3As shown, this embodiment provides a sealing device for GIS bolt connections, including: a sleeve 1 and a connecting rod 2. Both ends of the sleeve 1 are provided with sealing elements 3. The sleeve 1 is used to fit over the outside of the GIS bolt 9 and the GIS nut 11. One end of the connecting rod 2 passes through one end of the sleeve 1 and is used to connect with the GIS bolt 9. The other end of the connecting rod 2 is connected to a locking assembly. The sealing element 3 at one end of the sleeve 1 is in a sealing fit with the connecting rod 2, and the sealing element 3 at the other end of the sleeve 1 is used to seal with the sealing surface 10 of the GIS equipment.

[0034] By setting up a sleeve 1 with sealing elements 3 at both ends, the GIS bolt 9 and GIS nut 11 are fitted into the sleeve 1, and the remaining portion of the GIS bolt 9 is connected to the connecting rod 2 and locked in place by a locking assembly. This ensures that the sealing element 3 at one end of the sleeve 1 seals against the connecting rod 2, and the sealing element 3 at the other end of the sleeve 1 seals against the sealing surface 10 of the GIS equipment, thus forming a stable sealing structure. This eliminates the need for power outages and pressure relief of the GIS equipment to address air leaks at the GIS bolt connection, fundamentally solving the drawback of traditional leak handling requiring equipment shutdown (e.g., causing a complete wind farm shutdown) and avoiding significant economic losses caused by unplanned power outages. Simultaneously, it extends equipment operating time, creating conditions for the site to conduct planned maintenance at appropriate times.

[0035] Based on the above technical solution, the sleeve 1 is provided with sealing grooves 4 at both ends, and the sealing element 3 is placed in the corresponding sealing grooves 4.

[0036] By providing sealing grooves 4 at both ends of the sleeve 1, space is provided for the installation and positioning of the seal 3, preventing the seal 3 from shifting or falling off during installation or equipment operation vibration, ensuring that the seal 3 is always in the correct sealing position and guaranteeing the sealing effect. At the same time, during the subsequent tightening process, the sealing grooves 4 can guide the seal 3 to deform uniformly, further filling the gaps in the sealing surface and improving the ability to block gas leakage.

[0037] Based on the above technical solution, the sealing element 3 is a rubber ring.

[0038] The seal 3 is a rubber ring. The rubber ring has excellent elasticity and deformation capacity. When compressed, it can tightly fit the end face of the sleeve 1 and the sealing surface 10 of the GIS equipment or the surface of the clamping part 6, fully filling the tiny gaps and effectively blocking SF6 gas leakage. At the same time, the rubber material is resistant to SF6 gas corrosion, resistant to certain temperature changes (adapting to thermal expansion and contraction during equipment operation), and has good aging resistance. It can maintain sealing performance for a long time, matching the needs of long-term operation of GIS equipment and reducing the trouble of frequent replacement of seal 3.

[0039] Based on the above technical solution, one end of the sleeve 1 is provided with a first hole, and the other end of the sleeve 1 is provided with a second hole, and the first hole and the second hole are connected.

[0040] The first and second holes at both ends of the sleeve 1 are connected, providing a through-type installation channel for the connecting rod 2. This ensures that one end of the connecting rod 2 can smoothly pass into the sleeve 1 and connect with the GIS bolt 9, while the other end can extend out of the sleeve 1 to cooperate with the locking assembly, thus successfully achieving the sealing effect of "bolt connection - sleeve sealing - external locking".

[0041] Based on the above technical solution, the diameter of the second hole is larger than the diameter of the first hole.

[0042] The diameter of the second hole is set to be larger than that of the first hole to accommodate the connection requirements of the overall device and the GIS bolt 9. The end of the second hole forms a receiving space. When one end of the connecting rod 2 is connected to the GIS bolt 9 (if the size of the connection part (such as the GIS nut 11 or the connection washer) is large), the second hole can accommodate the connection part, so that the GIS bolt 9 can be smoothly inserted into one end of the sleeve 1 and connected to the connecting rod 2, avoiding structural interference between the end face of the sleeve 1 and the GIS bolt nut, etc., and ensuring the smooth installation of the sealing device.

[0043] Based on the above technical solution, the connecting rod 2 is inserted into the first hole.

[0044] The connecting rod 2 is inserted into the smaller diameter first hole, which reduces the gap between the connecting rod 2 and the sleeve 1, prevents the connecting rod 2 from shaking inside the sleeve 1, ensures the positioning function of the connecting rod 2 on the sleeve 1 (so that the sealing parts 3 at both ends of the sleeve 1 are accurately fitted to the sealing surface), and improves the stability of the sealing structure. The smaller gap between the smaller first hole and the connecting rod 2 reduces the risk of SF6 gas leakage from the gap between the connecting rod 2 and the first hole, forming "double protection" with the sealing parts 3 at both ends of the sleeve 1, and further improves the overall sealing effect.

[0045] Based on the above technical solution, one end of the connecting rod 2 is provided with an internal threaded hole 5, and the GIS bolt 9 is threadedly connected to the internal threaded hole 5.

[0046] The threaded connection between the internal threaded hole 5 and the GIS bolt 9 enables a reliable connection between the connecting rod 2 and the GIS bolt 9. This connection method has high connection strength and is detachable. It can not only ensure the fixing effect of the connecting rod 2 on the sleeve 1 (preventing the sleeve 1 from shifting), but also facilitate the disassembly of the sealing device during subsequent maintenance, which is highly flexible.

[0047] Specifically, by adjusting the different specifications (such as pitch and diameter) of the internal threaded hole 5, the sealing device can be adapted to different models of connecting bolts of GIS equipment, thereby improving its versatility.

[0048] Based on the above technical solution, a clamping component 6 is also included, which is sleeved on the outside of the connecting rod 2 and abuts against the sealing component 3 at one end of the sleeve 1.

[0049] The clamping component 6 is sleeved outside the connecting rod 2 and abuts against the sealing component 3 at one end of the sleeve 1. It can evenly transmit the locking force of the locking assembly to the sealing component 3, causing the sealing component 3 to deform evenly, fully filling the gap of the sealing surface, avoiding leakage caused by the sealing component 3 not being pressed tightly in some areas, and improving the sealing reliability.

[0050] Based on the above technical solution, the locking assembly includes a washer 7 and a locking nut 8. The washer 7 abuts against the clamping member 6. The outer side wall of the other end of the connecting rod 2 is provided with an external thread. The locking nut 8 is threadedly connected to the other end of the connecting rod 2 and abuts against the washer 7.

[0051] The gasket 7 increases the contact area between the locking nut 8 and the clamping member 6, preventing the locking nut 8 from directly damaging the clamping member 6. At the same time, it evenly transmits the pressure of the locking nut 8 to the clamping member 6, thereby ensuring that the sealing member 3 is subjected to uniform force and guaranteeing the sealing effect. The threaded connection between the locking nut 8 and the external thread of the connecting rod 2 allows for controllable and removable locking force, which not only ensures the long-term stability of the sealing device (avoiding loosening that could lead to sealing failure) but also facilitates subsequent adjustment or disassembly, making the operation flexible.

[0052] Based on the above technical solution, the outer diameter of the clamping member 6 is greater than or equal to the outer diameter of the sleeve 1.

[0053] The outer diameter of the clamping element 6 is greater than or equal to the outer diameter of the sleeve 1, which allows the clamping range of the clamping element 6 on the seal 3 to cover the entire seal 3 (avoiding the seal 3 edge not being clamped due to the outer diameter of the clamping element 6 being too small, thus forming a leakage channel), ensuring that the seal 3 is subjected to uniform force and sufficient deformation, and improving the sealing reliability.

[0054] In a specific example, when air leakage is detected at the connecting bolts of the sealing surface 10 of the GIS equipment by soapy water, the leak can be plugged through the sealing device without interrupting power or depressurizing, thereby extending the equipment's operating time until subsequent planned maintenance is carried out. The specific installation process is as follows: The connecting rod 2 is inserted into the first hole, and a rubber ring is placed in the sealing groove 4 at the other end of the sleeve 1. The sleeve 1 is then fitted over the GIS bolt 9 and GIS nut 11, with the rubber ring at the other end of the sleeve 1 abutting against the sealing surface 10 of the GIS equipment. Simultaneously, the internal threaded hole 5 of the connecting rod 2 is threadedly connected to the GIS bolt 9. A rubber ring is placed in the sealing groove 4 at one end of the sleeve 1. The other end of the connecting rod 2 is then fitted with a clamping component 6, a washer 7, and a locking nut 8 in sequence. The clamping component 6 abuts against the rubber ring at one end of the sleeve 1, the washer 7 abuts against the clamping component 6, and the locking nut 8 abuts against the washer 7. By tightening the locking nut 8, the other end of the sleeve 1 is pressed tightly against the sealing surface 10 of the GIS equipment, thus preventing further leakage of gas at the GIS bolt 9 connection point and extending the equipment's operating time. Maintenance can then be carried out during planned maintenance.

[0055] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0058] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A sealing device for GIS bolted connections, characterized in that, include: A sleeve (1) and a connecting rod (2) are provided with sealing elements (3) at both ends of the sleeve (1). The sleeve (1) is used to fit on the outside of the GIS bolt (9) and the GIS nut (11). One end of the connecting rod (2) passes through one end of the sleeve (1) and is used to connect with the GIS bolt (9). The other end of the connecting rod (2) is connected to the locking assembly. The sealing element (3) at one end of the sleeve (1) is sealed to the connecting rod (2). The sealing element (3) at the other end of the sleeve (1) is used to seal with the sealing surface (10) of the GIS equipment.

2. The sealing device for GIS bolted connections according to claim 1, characterized in that, The sleeve (1) has sealing grooves (4) at both ends, and the sealing element (3) is placed in the corresponding sealing groove (4).

3. The sealing device for GIS bolted connections according to claim 1, characterized in that, The sealing element (3) is a rubber ring.

4. The sealing device for GIS bolted connections according to claim 1, characterized in that, One end of the sleeve (1) is provided with a first hole, and the other end of the sleeve (1) is provided with a second hole, and the first hole and the second hole are connected.

5. A sealing device for GIS bolted connections according to claim 4, characterized in that, The diameter of the second hole is larger than the diameter of the first hole.

6. A sealing device for GIS bolted connections according to claim 4, characterized in that, The connecting rod (2) passes through the first hole.

7. A sealing device for GIS bolted connections according to claim 1, characterized in that, One end of the connecting rod (2) is provided with an internal threaded hole (5), and the GIS bolt (9) is threadedly connected to the internal threaded hole (5).

8. A sealing device for GIS bolted connections according to claim 1, characterized in that, It also includes a clamping element (6), which is sleeved on the outside of the connecting rod (2) and abuts against the sealing element (3) at one end of the sleeve (1).

9. A sealing device for GIS bolted connections according to claim 8, characterized in that, The locking assembly includes a washer (7) and a locking nut (8). The washer (7) abuts against the clamping member (6). The outer side wall of the other end of the connecting rod (2) is provided with an external thread. The locking nut (8) is threaded to the other end of the connecting rod (2) and abuts against the washer (7).

10. A sealing device for GIS bolted connections according to claim 8, characterized in that, The outer diameter of the clamping member (6) is greater than or equal to the outer diameter of the sleeve (1).

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