Seal-tight fastening device for GIS bushings

Abstract

The utility model relates to the technical field of GIS bushing sealing, specifically sealed fastening device of GIS bushing installation, including the flange ring of installing in the both ends of pipe cover main part, the side away from the pipe cover main part of flange ring is equipped with annular groove, the annular groove is installed with annular sealing element, the flange ring is installed with a plurality of locking bolt close to the circumference, and the flange ring is connected with equipment flange far. In the sealed fastening device of GIS bushing installation, the annular groove of the side away from the pipe cover main part of flange ring is installed with annular sealing element, and the basic sealing structure is formed, the arc convex surface of the front surface of annular sealing element can be tightly combined and resist the flange surface of equipment flange, increase sealing contact area, and the sealing effect is promoted, the ridge of the inside and outside two sides of annular sealing element is along the circumferential direction parallel setting, can effectively fill the tiny gap between flanges in the fastening process, further enhances the sealing performance, prevents insulation gas leakage, and guarantees the insulation performance and operation safety of equipment.

Description

Technical Field

[0001] This utility model relates to the field of GIS sleeve sealing technology, and more specifically, to a sealing and fastening device for GIS sleeve installation. Background Technology

[0002] In the field of GIS (Gas Insulated Metal Enclosed Switchgear) bushing sealing technology, with the increasing demands for power supply reliability and stability in power systems, the sealing performance of GIS bushings is directly related to the safe operation of the equipment. Chinese Patent (Application No.: 201810844387.7) discloses a sealing end cap for GIS outgoing bushings. This sealing end cap includes a sealing end cap body, a support cylinder, a self-sealing valve, a nut, and studs, etc., and is mainly used to ensure the dryness and cleanliness of GIS outgoing bushings during transportation and storage, avoiding conductor impact, moisture, corrosion, and other problems. It also has the advantages of simple structure and convenient installation and disassembly.

[0003] However, the aforementioned patented technologies focus on protection during transportation and storage. In actual installation and use, their sealing structures and fastening methods are insufficient to meet the requirements of long-term stable operation. After the GIS sleeve is installed on the equipment, factors such as equipment vibration, temperature changes, and internal gas pressure fluctuations during operation can cause gaps at the seal, leading to leakage of insulating gas and affecting the equipment's insulation performance. Ordinary fastening structures also cannot guarantee uniform stress distribution across all parts, and uneven sealing pressure further reduces the sealing effect. Furthermore, this technology lacks the function of real-time monitoring of the sealing status, making it impossible to detect sealing problems that occur during operation in a timely manner. Therefore, there is an urgent need to design a sealing and fastening device suitable for the GIS sleeve installation process, which can effectively improve sealing performance, achieve uniform fastening, and has real-time sealing monitoring capabilities. Utility Model Content

[0004] The purpose of this utility model is to provide a sealing and fastening device for GIS sleeve installation, so as to solve the problem mentioned in the background art that the sealing structure and fastening method are difficult to meet the requirements of long-term stable operation during actual installation and use.

[0005] To achieve the above objectives, this utility model provides a sealing and fastening device for GIS sleeve installation, including flange rings installed at both ends of the sleeve body. An annular groove is provided on the side of the flange ring away from the sleeve body, and an annular seal is installed in the annular groove. Several locking bolts are installed on the flange ring near the circumference, and the locking bolts connect the flange ring to the equipment flange.

[0006] This setup involves creating an annular groove on the flange ring away from the main body of the sleeve and installing an annular seal. The elastic deformation of the annular seal fills the microscopic unevenness of the flange connection surface, and the circumferentially distributed locking bolts provide a radially uniform tightening force, forming an initial sealing barrier.

[0007] Preferably, the flange ring has a central hole in its center, which is aligned with the central hole of the equipment flange.

[0008] This setting aligns the center hole of the flange ring with the center hole of the equipment flange to ensure coaxiality when the conductor passes through, and to avoid uneven electric field distribution due to misalignment.

[0009] Preferably, the annular seal has several ribs installed on its inner and outer sides near the inner wall of the annular groove.

[0010] Preferably, the ribs are arranged circumferentially along the annular seal and are parallel to each other.

[0011] These two features include ribs on the inner and outer sides of the annular seal that are parallel to each other along the circumference. When tightened, these ribs are embedded into the flange surface through elastic deformation, increasing the sealing path length and contact stress.

[0012] Preferably, a pressure sensor is installed on the back of the annular seal near the inner wall of the annular groove, and the pressure sensor is connected to an external monitoring device via a circuit.

[0013] This device uses a pressure sensor to monitor the stress state of the annular seal in real time and transmits the data to an external monitoring system via a line.

[0014] Preferably, the annular seal has an arc-shaped convex surface on its front side, which fits tightly against the flange surface of the equipment flange.

[0015] This curved convex surface design allows the seal to form a line contact with the equipment flange surface, improving the local sealing effect by concentrating stress.

[0016] Preferably, the flange ring has a bolt hole near the locking bolt, and the locking bolt passes through the bolt hole and is threadedly connected to the equipment flange.

[0017] Preferably, one end of the locking bolt is fitted with a bolt head, and a sealing ring is fitted near the flange ring surface of the bolt head to seal the gap between the bolt head and the flange ring.

[0018] These two features include a sealing ring at the bolt head to block the leakage path of the bolt hole, forming a double sealing protection.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] In the sealing and fastening device for this GIS bushing, an annular seal is installed in the annular groove on the side of the flange ring away from the main body of the bushing, forming a basic sealing structure. The arc-shaped convex surface on the front of the annular seal can tightly fit against the flange face of the equipment flange, increasing the sealing contact area and improving the sealing effect. The ribs on the inner and outer sides of the annular seal are arranged parallel to each other along the circumference, which can effectively fill the tiny gaps between the flanges during the fastening process, further enhancing the sealing performance, preventing the leakage of insulating gas, and ensuring the insulation performance and operational safety of the equipment.

[0021] Several locking bolts located near the circumference of the flange ring allow for the application of tightening force from multiple points when connecting the flange ring to the equipment flange, compared to traditional single or partial tightening methods. This makes it easier to achieve a uniform distribution of overall tightening force, reduce differences in sealing pressure caused by uneven tightening, and improve the reliability and stability of the sealing tightening.

[0022] A pressure sensor mounted on the back of the annular seal is connected to external monitoring equipment via wiring, enabling real-time monitoring of pressure changes at the seal. In the event of a sealing abnormality, such as pressure fluctuations exceeding the normal range, a signal is promptly transmitted to the external monitoring equipment. This allows staff to quickly identify the problem and take appropriate measures, preventing serious safety accidents caused by sealing failures. This dynamic, real-time monitoring of the GIS sleeve's sealing status significantly improves the safety and reliability of equipment operation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the flange ring structure in this utility model;

[0025] Figure 3 This is a front structural diagram of the flange ring in this utility model;

[0026] Figure 4 This is a schematic diagram of the locking bolt in this utility model;

[0027] Figure 5 This is a schematic diagram of the annular seal in this utility model;

[0028] The meanings of the labels in the diagram are as follows:

[0029] 1. Pipe sleeve body; 2. Flange ring; 21. Center hole; 22. Annular groove; 23. Bolt hole; 3. Locking bolt; 31. Bolt head; 32. Sealing ring; 4. Annular seal; 41. Pressure sensor; 42. Rib; 43. Arc-shaped convex surface. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] This utility model provides a sealing and fastening device for GIS sleeve installation, such as Figure 1 , Figure 2 , Figure 3 As shown, the device includes flange rings 2 installed at both ends of the pipe sleeve body 1. An annular groove 22 is provided on the side of the flange ring 2 away from the pipe sleeve body 1. An annular seal 4 is installed in the annular groove 22. Several locking bolts 3 are installed on the flange ring 2 near the circumference. The locking bolts 3 connect the flange ring 2 to the equipment flange.

[0032] By creating an annular groove 22 on the side of the flange ring 2 away from the main body 1 of the casing and installing an annular seal 4, the elastic deformation of the annular seal fills the microscopic unevenness of the flange connection surface. Combined with circumferentially distributed locking bolts 3, this provides a radially uniform tightening force, forming an initial sealing barrier. This achieves a basic sealed connection between the GIS casing and the equipment flange, preventing SF6 gas leakage and improving structural stability.

[0033] In this embodiment, as Figure 2 , Figure 3 As shown, a central hole 21 is provided in the middle of the flange ring 2, and the central hole 21 is aligned with the central hole of the equipment flange.

[0034] The central hole 21 in the flange ring 2 is aligned with the central hole of the equipment flange to ensure coaxiality when the conductor passes through, avoiding uneven electric field distribution due to misalignment. This ensures the reliability of the electrical connection, reduces the risk of partial discharge, and extends the equipment life.

[0035] Specifically, such as Figure 5 As shown, several ribs 42 are installed on the inner and outer sides of the annular seal 4 near the inner wall of the annular groove 22.

[0036] Furthermore, such as Figure 5 As shown, the ribs 42 are arranged circumferentially along the annular seal 4 and are parallel to each other.

[0037] The inner and outer ribs 42 of the annular seal 4 are arranged parallel to each other along the circumference. When tightened, they are embedded into the flange surface through elastic deformation, increasing the sealing path length and contact stress. This significantly improves sealing performance, especially providing adaptive compensation for minor flange displacements caused by vibration or temperature changes.

[0038] Furthermore, such as Figure 5As shown, a pressure sensor 41 is installed on the back of the annular seal 4 near the inner wall of the annular groove 22. The pressure sensor 41 is connected to an external monitoring device via a line.

[0039] Pressure sensor 41 monitors the stress state of the annular seal 4 in real time and transmits the data to an external monitoring system via a line. This enables online monitoring of the sealing status, provides early warning of leakage risks, and avoids power outages caused by sudden malfunctions.

[0040] Furthermore, such as Figure 5 As shown, the annular seal 4 has an arc-shaped convex surface 43 on its front side, which fits and abuts against the flange surface of the equipment flange.

[0041] The design of the curved convex surface 43 allows the seal to form line contact with the equipment flange face, improving the local sealing effect through stress concentration. Good sealing can be achieved with lower tightening force, reducing the risk of bolt fatigue and decreasing reliance on flange surface flatness.

[0042] Furthermore, such as Figure 3 As shown, a bolt hole 23 is provided on the flange ring 2 near the locking bolt 3. The locking bolt 3 passes through the bolt hole 23 and is threadedly connected to the equipment flange.

[0043] Furthermore, such as Figure 4 As shown, a bolt head 31 is installed at one end of the locking bolt 3, and a sealing ring 32 is installed near the surface of the flange ring 2 on the bolt head 31. The sealing ring 32 seals the gap between the bolt head 31 and the flange ring 2.

[0044] The sealing ring 32 at the bolt head 31 blocks the leakage path of the bolt hole 23, forming a double sealing protection.

[0045] It prevents gas leakage along the bolt axis, and is especially suitable for high-pressure GIS systems, improving overall sealing reliability.

[0046] When using the sealing and fastening device for GIS sleeve installation of this utility model, firstly, when installing the GIS sleeve and the equipment, align the flange rings 2 at both ends of the sleeve body 1 with the equipment flange, so that the central hole 21 in the middle of the flange ring 2 is precisely aligned with the central hole in the equipment flange, ensuring that the conductor can pass through smoothly and remain coaxial, laying the foundation for the stability of the electrical connection.

[0047] Subsequently, the annular seal 4 is installed using the annular groove 22. Due to its elasticity, the annular seal 4's arc-shaped convex surface 43 tightly adheres to the flange face of the equipment flange during the contact process between the flange ring 2 and the equipment flange, forming a line contact seal. This concentrated stress achieves a good initial sealing effect. Simultaneously, the ribs 42 on both the inner and outer sides of the annular seal 4 are distributed parallel to each other along the circumference. When the flange is tightened, the ribs 42 deform elastically and embed into the flange surface, increasing not only the length of the sealing path but also the contact stress, further enhancing the sealing performance. This effectively addresses the micro-displacement of the flange caused by vibration and temperature changes during equipment operation, preventing seal failure.

[0048] Next, several locking bolts 3 are threaded through the bolt holes 23 on the flange ring 2 and connected to the equipment flange, and the bolts are tightened gradually in a diagonal or circumferential sequence. During this process, the circumferentially distributed locking bolts 3 can apply a uniform tightening force from multiple points, making the flange ring 2 and the equipment flange tightly connected, further compressing the annular seal 4, so that it fully fills the microscopic unevenness of the flange connection surface, forming a stable and reliable sealing barrier, effectively preventing SF6 gas leakage. At the same time, the sealing ring 32 installed at the bolt head 31 at one end of the locking bolt 3 will block the leakage path of the bolt hole 23, providing double protection for the seal, which is especially suitable for high-pressure GIS systems and greatly improves the overall sealing reliability.

[0049] During equipment operation, the pressure sensor 41, installed on the back of the annular seal 4 near the inner wall of the annular groove 22, begins to function. It monitors the stress state of the annular seal 4 in real time and transmits the monitored pressure data to external monitoring equipment via a line. If an abnormality occurs at the seal, such as pressure fluctuations exceeding the normal range due to seal aging or flange loosening, the external monitoring equipment can promptly receive the signal and issue an early warning. Based on this, personnel can quickly take measures to avoid serious safety accidents caused by sealing failures, achieving dynamic and real-time monitoring of the GIS sleeve sealing status and ensuring the safe and stable operation of the equipment.

[0050] Finally, it should be noted that the pressure sensor 41 and other electronic components in this embodiment are all general standard parts or parts known to those skilled in the art. Their structure and principle can be known to those skilled in the art through technical manuals or conventional experimental methods. In the idle part of this device, all the above-mentioned electrical components are connected by wires. The specific connection method should refer to the working order of each electrical component in the above working principle to complete the electrical connection. All of these are technologies known in the art.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A sealing and fastening device for GIS sleeve installation, comprising flange rings (2) installed at both ends of the sleeve body (1), characterized in that: The flange ring (2) has an annular groove (22) on the side away from the pipe sleeve body (1). An annular seal (4) is installed in the annular groove (22). Several locking bolts (3) are installed on the flange ring (2) near the circumference. The locking bolts (3) connect the flange ring (2) to the equipment flange. Several ribs (42) are installed on the inner and outer sides of the annular seal (4) near the inner wall of the annular groove (22). The ribs (42) are arranged circumferentially along the annular seal (4) and are parallel to each other; A pressure sensor (41) is installed on the back of the annular seal (4) near the inner wall of the annular groove (22), and the pressure sensor (41) is connected to an external monitoring device via a line. The annular seal (4) has an arc-shaped convex surface (43) on its front side, and the arc-shaped convex surface (43) fits and abuts against the flange surface of the equipment flange. The flange ring (2) has a bolt hole (23) near the locking bolt (3), and the locking bolt (3) passes through the bolt hole (23) and is threaded to the equipment flange; One end of the locking bolt (3) is fitted with a bolt head (31), and a sealing ring (32) is fitted on the bolt head (31) near the surface of the flange ring (2). The sealing ring (32) seals the gap between the bolt head (31) and the flange ring (2).

2. The sealing and fastening device for GIS sleeve installation according to claim 1, characterized in that: The flange ring (2) has a central hole (21) in the middle, which is aligned with the central hole of the equipment flange.

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