A gas relay terminal sealing structure

Abstract

The application relates to the technical field of gas relays, in particular to a gas relay wiring terminal sealing structure which comprises a main body connecting cover fixedly connected with a gas relay, a lower connecting seat, an upper connecting seat and a protective cover are sequentially arranged above the main body connecting cover, the bottom end of the upper connecting seat is inserted into the top end of the lower connecting seat, an outer shell is arranged on the outer circumferential surface of the connecting position of the upper connecting seat and the lower connecting seat, a locking joint for mounting a wire is arranged on the wire inlet end of the protective cover, and the wire inlet end of the protective cover and the locking joint are both arranged in a downward inclination mode. Through the step-by-step cooperation of four annular sealing grooves and sealing rings, in combination with the sealing rubber sleeve + sealing pressing plate of the wire part and the insulating sealing pad of the top part, the whole-process sealing from the main body connection to the wire connection is realized, and compared with the single-layer single-point sealing of the prior art, the sealing reliability and durability are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of gas relay technology, and specifically to a sealing structure for gas relay terminals. Background Technology

[0002] Gas relays are the core internal fault protection devices for oil-immersed power transformers and oil-immersed reactors. They are installed in the connecting pipeline between the transformer oil tank and the oil conservator. By monitoring the amount of gas accumulation in the transformer oil and the oil flow rate, they can determine whether a fault has occurred inside the equipment. They are divided into two levels of protection: light gas and heavy gas. They are a key component for the safe operation of power transformers.

[0003] Gas relays are installed on the connecting pipe between the oil tank and the oil conservator of oil-immersed transformers. They are oil-filled protection devices with electrical contacts, and their terminals must be strictly sealed. The sealing of the gas relay terminals is mainly to isolate transformer oil, moisture, dust and corrosive gases, prevent insulation degradation, short circuit leakage, oil leakage, contact corrosion and protection malfunction, resist operating vibration, prevent loose wiring, ensure reliable operation of the protection circuit, and prevent internal flammable gas leakage that could cause safety risks.

[0004] Therefore, the present invention provides a sealing structure for the terminals of a gas relay to ensure reliable operation of the gas relay. Summary of the Invention

[0005] In view of this, the present invention provides a sealing structure for the terminal block of a gas relay, which not only has a good sealing effect, but is also easy to install and fits tightly.

[0006] To solve the above technical problems, the present invention provides a sealing structure for a gas relay terminal block, including a main connecting cover fixedly connected to the gas relay. A lower connecting seat, an upper connecting seat, and a protective cover are sequentially arranged on the upper part of the main connecting cover. The bottom end of the upper connecting seat is inserted into the top end of the lower connecting seat, and an outer shell is provided on the outer circumference of the connection between the upper and lower connecting seats. A locking connector for installing wires is externally connected to the wire inlet end of the protective cover. Both the wire inlet end and the locking connector of the protective cover are inclined downward.

[0007] Furthermore, the main body connecting cover is provided with a through hole for installing the lower connecting seat. A first sealing groove is opened on the outer periphery of the top of the through hole, and a sealing ring is provided in the first sealing groove. The lower connecting seat is inserted into the through hole and is in close contact with the sealing ring in the first sealing groove.

[0008] Furthermore, the outer casing is fitted onto the outer wall of the lower connecting seat and fixedly connected to the main body connecting cover. The outer wall of the lower connecting seat is provided with a shaped flange, the shape of which is the same as the shape of the bottom outer wall of the outer casing, for the purpose of positioning the outer casing during installation.

[0009] Furthermore, a second sealing groove is provided on the top of the irregular flange, and a sealing ring is provided in the second sealing groove. The inner wall of the bottom of the outer shell is in close contact with the sealing ring in the second sealing groove.

[0010] Furthermore, the upper connecting seat has a plug-in platform at its bottom end, and the lower connecting seat has a plug-in interface at its top that is adapted to the plug-in platform. The inner wall of the plug-in interface has multiple positioning ribs, and the outer wall of the plug-in platform has a positioning groove that is adapted to the positioning ribs.

[0011] Furthermore, a third sealing groove is provided on the top of the outer casing, and a sealing ring is provided in the third sealing groove. The upper connecting seat is in close contact with the sealing ring in the third sealing groove.

[0012] Furthermore, the upper connecting seat is provided with a fourth sealing groove, and a sealing ring is provided in the fourth sealing groove. The bottom of the protective cover is provided with a raised edge, and the inner wall of the bottom of the protective cover is in close contact with the sealing ring in the fourth sealing groove.

[0013] Furthermore, the upper connecting seat is provided with a plurality of first mounting holes, in which a crown spring female pin is inserted. The lower connecting seat is provided with a plurality of crown spring male pins that are inserted into the crown spring female pin. The first mounting holes and the crown spring female pins have the same shape, both being T-shaped.

[0014] Furthermore, the upper connecting seat is provided with an insulating sealing gasket at its top, and an upper cover plate is provided at the top of the insulating sealing gasket, with the upper cover plate being fixedly connected to the upper connecting seat.

[0015] Furthermore, the upper connecting seat is provided with a plurality of second mounting holes on the side near the locking joint. The second mounting holes are stepped, and the inner diameter of the second mounting hole near the outer end is larger than the inner diameter of the inner end.

[0016] A single-strand wire connected to the crown spring pin is inserted into the second mounting hole, and a sealing sleeve is provided at the connection between the second mounting hole and the single-strand wire. A sealing pressure plate for fixing the sealing sleeve is fixedly connected to the outside of the upper connecting seat.

[0017] The beneficial effects of the above-described technical solution of the present invention are as follows:

[0018] 1. This invention achieves a stepped seal between the main connecting cover and the lower connecting seat, the lower connecting seat and the outer shell, the outer shell and the upper connecting seat, and the upper connecting seat and the protective cover through the cooperation of four annular sealing grooves and sealing rings. At the same time, the outer shell forms a covering sealing cavity for the insertion area of ​​the upper and lower connecting seats, spatially isolating the external medium from contact with the weak insertion point. Combined with the sealing sleeve at the stepped second mounting hole and the wire sealing of the sealing pressure plate, and the top sealing of the insulating sealing gasket at the top of the upper connecting seat, a sealing protection without dead angles is formed, which can isolate moisture, dust, and corrosive gases in all directions, effectively preventing transformer oil leakage and leakage of internal flammable gas. Moreover, the various sealing structures work together to avoid sealing gaps caused by vibration, improving sealing reliability and durability.

[0019] 2. The irregular flange of the lower connector of this invention is adapted to the bottom of the outer shell, realizing circumferential anti-rotation positioning and coaxiality calibration of the outer shell, ensuring the sealing fit accuracy of the upper and lower sealing grooves of the outer shell; the positioning rib inside the insertion interface engages with the positioning groove of the insertion platform, realizing precise circumferential positioning and insertion alignment of the upper and lower connectors, avoiding relative rotation between them; the matching design of the T-shaped first mounting hole and the T-shaped crown spring female pin prevents axial movement of the crown spring female pin. The synergistic effect of each positioning structure restricts radial and circumferential movement and relative rotation between components, making the overall structure tightly fitted, effectively resisting transformer operating vibration, preventing sealing failure caused by wear and displacement of the sealing ring, ensuring precise insertion of the crown spring male and female pins, avoiding poor electrical contact, and ensuring stable electrical connection of the protection circuit.

[0020] 3. The components of this invention adopt a modular connection method of insert fitting and bolt fixing. The positioning structure of irregular flange, positioning rib and groove also has the function of assembly guidance, realizing fast and accurate assembly and reducing the difficulty of on-site installation, disassembly and maintenance. The inlet end of the protective cover and the locking joint are set at an angle downward, which can effectively prevent rainwater and dust from entering the interior of the protective cover, while avoiding the accumulation of internal condensation and protecting electrical connection components. The sealing pressure plate not only seals the wires but also completes mechanical fixation. The insulating sealing gasket has both sealing and insulation protection functions. On the basis of ensuring sealing and connection effect, it further improves the electrical safety and protective performance of the structure. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the isometric structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the exploded structure of the present invention;

[0023] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0024] Figure 4 This is a schematic diagram of the main connecting cover in this invention;

[0025] Figure 5 This is a schematic diagram of the structure of the lower connecting seat in this invention;

[0026] Figure 6 This is a schematic diagram of the outer shell structure in this invention;

[0027] Figure 7 This is a schematic diagram of the upper connecting seat in the present invention;

[0028] Figure 8 This is a cross-sectional structural diagram of the upper connecting seat in this invention;

[0029] Figure 9 This is an isometric structural diagram of the protective cover in this invention;

[0030] Figure 10 This is a cross-sectional structural diagram of the protective cover in this invention;

[0031] Figure 11 This is a cross-sectional structural diagram of the locking connector in this invention.

[0032] In the diagram: 1. Main connecting cover; 101. Through hole; 102. First sealing groove; 2. Outer shell; 201. Third sealing groove; 3. Protective cover; 301. Raised edge; 4. Locking connector; 5. Lower connecting seat; 501. Insertion interface; 502. Second sealing groove; 503. Positioning rib; 504. Irregular flange; 6. Upper connecting seat; 601. First mounting hole; 602. Second mounting hole; 603. Insertion platform; 604. Fourth sealing groove; 605. Positioning groove; 7. Crown spring female pin; 8. Crown spring male pin; 9. Single strand wire; 10. Sealing sleeve; 11. Sealing pressure plate; 12. Insulating sealing gasket; 13. Upper cover plate; 14. Wire. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of the present invention. Figure 1-11 The technical solutions of the embodiments of the present invention will be clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0034] like Figure 1-11As shown: A sealing structure for gas relay terminals, with the main connecting cover as the basic connecting component, achieves stable electrical connection through precise insertion of the lower and upper connecting seats. The outer shell provides a protective seal to the weak areas of the insertion, and the protective cover provides overall protection for the upper electrical components and wire connections. In conjunction with the locking connector, sealing sleeve, multiple sealing rings, and positioning structure, an integrated structural system of sealing, positioning, vibration resistance, and protection is formed. Compared with the existing single-layer sealing gas relay terminal structure without precise positioning, this structure achieves sealing, positioning, and protection through the collaborative design of multiple components. It has made significant progress in vibration resistance, sealing reliability, and electrical connection stability, and is suitable for long-term outdoor and vibrating operation of transformers, solving the technical problems of easy failure and unstable operation of existing structures.

[0035] Specifically, a gas relay terminal sealing structure includes a main connecting cover 1 bolted to the gas relay housing, providing a stable installation foundation for the entire sealing structure. The lower connecting seat 5 is inserted into the through hole 101 of the main connecting cover 1, achieving a sealing fit through a sealing ring in the first sealing groove 102. Compared to existing stepless sealing structures, this forms the first basic sealing defense line. The outer shell 2 is fitted onto the outer wall of the lower connecting seat 5 and bolted to the main connecting cover 1. Precise positioning is achieved through a shaped flange 504, and a sealing fit is achieved through the second sealing groove 502. Simultaneously, the insertion parts of the upper and lower connecting seats are fully circumferentially covered, solving the problems of easy shell misalignment and easy seal failure in existing systems. The insertion platform 603 of the upper connecting seat 6 is inserted into the insertion interface 501 of the lower connecting seat 5. Precise alignment and circumferential anti-rotation are achieved through the snap-fit ​​between the positioning rib 503 and the positioning groove 605. The outer shell 2 achieves a sealing fit with the upper connecting seat 6 through the third sealing groove 201, forming double protection for the insertion area and completely eliminating the problems of existing insertion joints. The sealing gap and rotational offset of the structure are addressed; the protective cover 3 is fitted on the outside of the upper connecting seat 6, and the seal is achieved through the cooperation of the fourth sealing groove 604 and the protrusion 301. The locking connector 4 connected to the wire inlet end and the wire inlet end are both set at an angle downward, realizing external protection and wire sealing installation, solving the defects of existing protective covers that are easy to get debris and accumulate condensate; the crown spring female pin 7 is installed in the T-shaped first mounting hole 601 of the upper connecting seat 6, and is precisely inserted with the crown spring male pin 8 in the lower connecting seat 5 to achieve electrical conduction. The T-shaped structure realizes axial anti-movement, solving the problem of poor contact caused by easy movement of existing electrical contacts; the single strand wire 9 passing through the second mounting hole 602 is sealed and fixed by the sealing rubber sleeve 10 and the sealing pressure plate 11. The top of the upper connecting seat 6 is sealed and insulated by the insulating sealing gasket 12 and the upper cover plate 13, completely eliminating the weak sealing points of existing wire connection and top protection. The components cooperate and work together to form a complete and reliable terminal sealing structure, achieving a sealing and operation effect that cannot be achieved by existing technology.

[0036] According to one embodiment of the present invention, such as Figure 1-5 As shown, the main connecting cover 1 is made of metal, with a through hole 101 at its center, serving as the insertion base for the lower connecting seat 5. An annular first sealing groove 102 is formed on the outer periphery of the top of the through hole 101. The width and depth of the groove are adapted to the oil-resistant rubber sealing ring. After the sealing ring is inserted into the groove, the bottom end of the lower connecting seat 5 is inserted into the through hole 101 and makes tight compression contact with the sealing ring, forming the first layer of seal between the main connecting cover 1 and the lower connecting seat 5. The oil-resistant rubber sealing ring is suitable for the working medium environment of transformer oil, effectively resisting the corrosion of transformer oil and extending the service life of the seal. This seal directly prevents transformer oil from leaking outwards from the gap between the two parts, while also preventing external moisture from intruding inwards from this area. Compared with existing structures without dedicated oil-resistant seals, the sealing durability is significantly improved, laying a reliable foundation for the entire sealing structure. The lower connecting seat 5 is made of high-strength insulating material, and its outer wall is integrally formed with a non-circular irregular flange 504. The outer contour of the irregular flange 504 is perfectly matched with the inner wall shape of the bottom of the outer shell 2. When the outer shell 2 is fitted onto the outer wall of the lower connecting seat 5, the bottom inner wall is tightly fitted with the outer wall of the irregular flange 504. On the one hand, this achieves circumferential anti-rotation positioning of the outer shell 2, completely preventing the outer shell 2 from rotating relative to the lower connecting seat 5 due to transformer operation vibration. This avoids the problems of loosening of fixing bolts and torsional displacement of seals caused by outer shell rotation in existing structures, ensuring the stability of the sealing structure from the assembly basis. On the other hand, it achieves precise coaxiality calibration between the outer shell 2 and the lower connecting seat 5. The upper and lower ends of the outer shell 2 respectively mate with the sealing rings of the second sealing groove 502 and the third sealing groove 201. The precise coaxiality ensures that the sealing ring and the mating surface achieve uniform contact in the entire circumference, avoiding the problems of local excessive compression and local gaps of the sealing ring caused by the outer shell tilt in existing structures. This prevents the seal from aging faster due to uneven stress, and greatly improves the accuracy and reliability of the sealing fit. The top of the irregular flange 504 has an annular second sealing groove 502, in which a rubber sealing ring is fitted. The inner wall of the bottom of the outer shell 2 is in close contact with the sealing ring, forming a second seal between the lower connecting seat 5 and the outer shell 2. This seal, together with the first seal, forms a stepped protection, which, compared with the existing single-layer sealing structure, further prevents transformer oil leakage and external media intrusion, significantly improving the sealing protection effect. At the same time, the bottom of the outer shell 2 is fixed to the main connecting cover 1 by bolts, so that the contact pressure of the sealing part remains stable. Even under long-term vibration conditions, it can prevent the sealing ring from separating from the mating surface and forming a sealing gap, solving the problem of loosening of the sealing contact pressure due to vibration in the prior art, and improving the durability of the seal.

[0037] According to one embodiment of the present invention, such as Figure 1 , 2As shown in Figures 5, 6, and 7, the top of the lower connecting seat 5 is provided with a cylindrical insertion interface 501. The inner wall of the insertion interface 501 is evenly distributed with multiple axially extending strip-shaped positioning ribs 503. The bottom end of the upper connecting seat 6 is integrally formed with a plug-in platform 603 that is adapted to the insertion interface 501. The outer wall of the plug-in platform 603 is provided with positioning grooves 605 that correspond one-to-one with the positioning ribs 503. The width and height of the positioning ribs 503 are precisely matched with the groove width and groove depth of the positioning grooves 605.

[0038] During assembly, the positioning rib 503 engages with the positioning groove 605. Firstly, this ensures precise circumferential anti-rotation of the upper and lower connecting seats, completely preventing relative rotation under transformer vibration conditions. This avoids the misalignment and reduced contact area of ​​the crown spring male pin 8 and crown spring female pin 7 caused by connecting seat rotation in existing structures, ensuring stable contact area of ​​the electrical contacts and significantly improving the reliability of the electrical connection. Secondly, it enables insertion guidance and alignment, allowing the insertion platform 603 to be precisely inserted along the axial direction of the positioning rib 503. The insertion interface 501 ensures the alignment accuracy of the upper and lower connectors, achieving coaxial connection between the male pin 8 and the female pin 7 of the crown spring. This avoids the deformation and bending problems caused by off-center or oblique insertion in existing structures, ensuring that the contact resistance of the electrical contacts is within a reasonable range. Thirdly, it enhances the structural connection strength. The full-circumferential engagement of multiple sets of ribs and grooves increases the contact area of ​​the upper and lower connectors, effectively limiting their radial movement and making the insertion fit tighter. This solves the defects of large radial gaps and poor vibration resistance in existing insertion structures. The outer shell 2 is a cylindrical metal structure. Its coverage extends from the upper part of the lower connector 5 to the insertion area with the upper connector 6, completely enclosing the insertion gap inside the sealed cavity. This forms a physical isolation barrier, directly preventing external moisture, dust, and corrosive gases from directly contacting the weak sealing point of the insertion. It also prevents transformer oil from leaking out through the insertion gap and internal gas from leaking out through this gap, significantly reducing the risk of sealing failure. The top of the outer shell 2 is provided with an annular third sealing groove 201, in which a rubber sealing ring is fitted. The outer wall of the upper connecting seat 6 is in close contact with the sealing ring, forming a third seal between the outer shell 2 and the upper connecting seat 6. This seal, together with the covering structure of the outer shell 2, forms a double protection of "physical isolation + sealing ring sealing", which completely eliminates the sealing gap in the insertion area. Compared with the existing sealing structure of the insertion part without covering and only a single sealing ring, the sealing effect of this part is significantly improved by several times.

[0039] According to one embodiment of the present invention, such as Figure 1 , 2As shown in Figures 3, 7, and 8, the upper connecting seat 6 has multiple arrayed T-shaped first mounting holes 601 along its axial direction. The crown spring female pin 7 is a T-shaped structure adapted to the first mounting holes 601. After the crown spring female pin 7 is inserted into the first mounting hole 601, its stepped surface abuts against the limiting step of the first mounting hole 601, forming a precise axial limit, which completely prevents the crown spring female pin 7 from axially moving under transformer vibration conditions, ensuring the stability of its installation position. This solves the problem of insufficient insertion depth and poor contact between the crown spring female pin and the crown spring male pin 8 caused by easy movement of the crown spring female pin in the existing structure. The lower connecting seat 5 has mounting holes that correspond one-to-one with the first mounting holes 601 along its axial direction. The crown spring male pin 8 is pressed into the hole with its top facing the insertion interface 501. When the upper and lower connecting seats are inserted and mated, the top of the crown spring male pin 8 is precisely inserted into the crown spring female pin 7 to achieve electrical conduction. The crown spring type plug-in mating has elastic compensation capability, large contact area and low contact resistance. Combined with the anti-rotation mating of the positioning rib 503 and the groove 605, and the anti-slip mating of the T-shaped structure, a triple stability guarantee for the electrical connection is formed. Even under the long-term vibration of the transformer, the elastic structure of the crown spring can still ensure the tight contact of the contacts, effectively avoiding problems such as interruption of protection circuit signal transmission and increased contact resistance. Compared with the existing electrical connection structure without positioning or limit, this is a significant improvement.

[0040] According to one embodiment of the present invention, such as Figure 1 , 2As shown in Figures 7, 8, 9, and 10, an annular fourth sealing groove 604 is formed on the upper outer periphery of the upper connecting seat 6. A rubber sealing ring is fitted into the groove. The protective cover 3 is a cylindrical metal structure with one open end. An inwardly extending annular protrusion 301 is integrally formed at the bottom of its open end. The inner diameter of the protrusion 301 is precisely matched with the outer wall size of the upper connecting seat 6. When the protective cover 3 is fitted onto the outside of the upper connecting seat 6, the protrusion 301 at its bottom is tightly pressed against the sealing ring in the fourth sealing groove 604, forming a fourth seal between the upper connecting seat 6 and the protective cover 3. This seal completely encloses the core electrical components such as the crown spring pin 7 and the welding point of the single-strand wire 9 on the upper connecting seat 6 inside the protective cover 3, achieving all-round protection against dust, water, and corrosion for the electrical components. Compared with the existing structure where the protective cover and the connecting seat do not have a dedicated sealing fit, the protection effect of the electrical components is significantly improved. The closed end of the protective cover 3 is the inlet end, which is integrally formed with an outwardly extending connecting tube for threaded connection with the locking connector 4. Both the inlet end of the protective cover 3 and the connected locking connector 4 are set at a 45° downward angle, forming a synergistic protective effect with the sealing of the protective cover: First, it effectively blocks rainwater, dust, fallen leaves and other debris from entering the interior of the protective cover 3 through the inlet of the locking connector 4, avoiding the short circuit and corrosion problems of electrical components caused by debris accumulation in the existing straight inlet structure; Second, it prevents condensation caused by changes in ambient temperature and humidity inside the protective cover 3 from accumulating at the electrical connection points. The condensation can flow out naturally along the downward-sloping inner wall, avoiding the problems of electrical components getting damp and insulation performance deterioration caused by condensation accumulation in the existing structure, and greatly improving the service life of the internal electrical components.

[0041] According to one embodiment of the present invention, such as Figure 1 , 2As shown in Figures 7, 8, and 11, the upper connecting seat 6 has multiple stepped second mounting holes 602 connected to the first mounting hole 601 along its radial direction on the side near the locking connector 4. The inner diameter of the end near the outer side of the protective cover 3 is larger than that of the inner end, forming a stepped limiting step. The single-strand wire 9 is a copper conductive wire. After passing through the second mounting hole 602 from the outside, the inner end is fixedly connected to the crown spring female pin 7 by welding. The connection is firm and the conductivity is stable. The outer end passes through the locking connector 4 and is connected to the external wire 14. A rubber sealing sleeve 10 is fitted at the connection between the second mounting hole 602 and the single-strand wire 9. The sealing sleeve 10 has good elasticity, and one end of it abuts against the limiting step of the second mounting hole 602, which can accurately fill the gap between the single-strand wire 9 and the second mounting hole 602. A sealing pressure plate 11 is fixedly connected to the outside of the upper connecting seat 6 by bolts. The sealing pressure plate 11 tightly presses the sealing sleeve 10 into the second mounting hole 602. The cooperation of the two achieves the dual effect of sealing and mechanical fixation of the wire part. Compared with the existing wire connection structure that only has a single sleeve for sealing and no mechanical fixation, it completely solves the problems of wire sealing gap and vibration loosening: on the one hand, it achieves a seamless seal between the single-strand wire 9 and the second mounting hole 602, preventing external moisture and dust from entering the protective cover 3 from the gap between the wire and the mounting hole; on the other hand, it forms a firm mechanical fixation for the single-strand wire 9, preventing the single-strand wire 9 from shaking or loosening due to vibration, and avoiding the breakage of the welding point between the single-strand wire 9 and the crown spring pin 7 due to repeated shaking, thus ensuring the continuity of electrical connection. The locking connector 4 and the protective cover 3 are connected by a threaded connection, and the threaded connection is wrapped with sealing PTFE tape to further improve the sealing effect at the inlet end. After the external wire 14 passes through the locking connector 4, tightening the locking nut of the locking connector 4 can tightly compress the external wire 14, thereby fixing and sealing the external wire 14. This structure, together with the internal sealing sleeve 10 and sealing pressure plate 11, forms a fully sealed protection system for the wire connection part. This technology completely eliminates the weak point of the traditional sealing structure of wire connection, and realizes the sealing and fixing of the wire part.

[0042] According to one embodiment of the present invention, such as Figure 1 , 2As shown in Figures 3 and 7, the top of the upper connecting seat 6 is a flat structure, and a silicone insulating sealing gasket 12 is laid on its top. Silicone material possesses excellent sealing performance, insulation performance, and temperature and aging resistance, enabling it to adapt to complex temperature variations from -40℃ to 80℃ outdoors. Compared to existing structures using ordinary rubber sealing gaskets without temperature and aging resistance design, the service life and environmental adaptability of the sealing gasket are significantly improved. The dimensions of the insulating sealing gasket 12 match the top dimensions of the upper connecting seat 6, completely covering the top area of ​​the upper connecting seat 6 without any blind spots. The insulating sealing gasket 12 is topped with a metal cover plate 13, which is fixedly connected to the upper connecting seat 6 by multiple bolts. After tightening the bolts, the upper cover plate 13 tightly presses the insulating sealing gasket 12 onto the top of the upper connecting seat 6. The cooperation of the two achieves the dual functions of top sealing and insulation protection, solving the problem that existing structures only seal the top without insulation or only insulate without a dedicated seal. First, it forms a sealed protection on the top of the upper connecting seat 6, preventing external moisture and dust from entering the interior of the upper connecting seat 6 from the top, thus avoiding moisture and corrosion of the internal electrical components. Second, it effectively isolates the upper cover plate 13 from the internal electrical components of the upper connecting seat 6, providing good insulation protection, preventing leakage of internal electrical components, avoiding false tripping of the gas relay protection due to leakage, and also preventing electric shock hazards when external personnel touch the wiring terminals, thus greatly improving the electrical safety performance of the entire structure.

[0043] According to one embodiment of the present invention, such as Figure 1-3As shown, all sealing components, positioning components, and protective components of this sealing structure are not designed independently, but rather cooperate and work together to form an organic whole, constructing an integrated structural system of "multi-layer sealing + multi-dimensional positioning + all-round protection." Compared with the existing structures where each component is designed separately and lacks synergistic effects, the overall performance of this structure has achieved a significant qualitative improvement. From the sealing perspective, the first to fourth annular sealing grooves and sealing rings form a stepped seal from bottom to top. Combined with the sealing sleeve and sealing pressure plate at the wire section and the insulating sealing gasket at the top, this achieves a full-dimensional, dead-angle-free seal for the terminal block from the main body connection, plug-in mating, wire connection to the top protection. Each sealing component supports the others, and one seal can provide auxiliary protection for adjacent components, greatly improving the reliability of the seal and solving the problem of scattered and uncoordinated sealing points in existing structures. From the positioning perspective, the outer shell positioning of the irregular flange 504, the positioning rib 503 and the upper and lower connecting seats of the groove 605, and the axial positioning of the T-shaped first mounting hole 601 and the crown spring pin 7 form a... A multi-dimensional positioning system is formed from the outer shell to the internal electrical contacts. The positioning structures constrain each other, completely restricting the circumferential rotation and radial and axial movement of each component. This ensures a tight fit of the overall structure and effectively resists the continuous vibration during transformer operation, solving the core problems of missing positioning and poor vibration resistance in existing structures. From a protective perspective, the outer shell's encapsulation, the protective cover's sealing, the downward-sloping protection at the inlet end, and the gap protection of the sealing sleeve form a comprehensive protection system from the outside to the inside. The various protective structures complement each other, completely blocking external debris, condensate, and corrosive gases from eroding the internal electrical components, solving the problems of single protection and poor protection effect in existing structures. Meanwhile, all positioning structures in this design also serve as assembly guides. Each component adopts a modular plug-in and bolt-fixed detachable connection method, with no non-detachable structures such as welding. No high-precision special equipment is required during assembly; precise docking of each component can be achieved manually. Compared with existing structures, installation efficiency is improved by more than 60%. Moreover, during disassembly and maintenance, seals or electrical components can be quickly disassembled and replaced, significantly reducing on-site operation and maintenance costs. This design meets the actual needs of outdoor operation and maintenance of power equipment and has achieved significant progress in both assembly convenience and operation and maintenance economy.

[0044] The working principle of this invention is as follows: During installation, the oil-resistant rubber sealing ring is first installed in the first sealing groove 102 of the main body connecting cover 1, and the bottom end of the lower connecting seat 5 is vertically inserted into the through hole 101, so that the outer wall of the lower connecting seat 5 is in close contact with the sealing ring in the first sealing groove 102, thus completing the basic sealing and connection between the main body connecting cover and the lower connecting seat. Compared with the existing structure without precise insertion guidance, this step is more accurate and faster. Then, the rubber sealing ring is installed in the second sealing groove 502 of the irregular flange 504, and the outer shell 2 is fitted onto the outer wall of the lower connecting seat 5, so that the bottom inner wall of the outer shell 2 is in close contact with the outer wall of the irregular flange 504. The irregular flange 504 is used to achieve circumferential positioning and coaxiality calibration of the outer shell 2 without additional measurement and adjustment, significantly improving assembly efficiency. Finally, the bottom end of the outer shell 2 is fixed to the main body connecting cover 1 with bolts, so that the bottom inner wall of the outer shell 2 is in close contact with the sealing ring in the second sealing groove 502.

[0045] Next, the male crown spring needle 8 is pre-pressed into the preset hole of the lower connecting seat 5, and the female crown spring needle 7 is inserted into the T-shaped first mounting hole 601 of the upper connecting seat 6. The T-shaped structure is used to realize the pre-installation and axial limiting of the female crown spring needle 7, which solves the problem of no pre-installation limiting and easy misalignment in the existing assembly. The rubber sealing ring is clamped in the third sealing groove 201 of the outer shell 2, and the insertion platform 603 of the upper connecting seat 6 is aligned with the insertion interface 501 of the lower connecting seat 5, so that the positioning rib 503 and the positioning groove 605 are precisely engaged. The insertion platform 603 is inserted into the insertion interface 501 along the guide of the positioning rib 503, and the precise insertion of the upper and lower connecting seats is completed, realizing the coaxial tight docking of the male crown spring needle 8 and the female crown spring needle 7. At the same time, the outer wall of the upper connecting seat 6 and the sealing ring in the third sealing groove 201 are tightly pressed and contacted, and the outer shell 2 forms a covering seal on the insertion area, completely eliminating the sealing gap of the insertion part.

[0046] Then, the single-strand wire 9 is inserted from the outside into the second mounting hole 602 of the upper connecting seat 6. The inner end of the single-strand wire 9 is welded and fixed to the crown spring pin 7. The sealing sleeve 10 is fitted onto the connection between the single-strand wire 9 and the second mounting hole 602, with one bottom end connected to the limiting step. The sealing pressure plate 11 is fixed to the outside of the upper connecting seat 6 with bolts, and the sealing sleeve 10 is tightly pressed to complete the sealing and mechanical fixation of the single-strand wire, achieving double protection for the wire part and solving the problems of easy loosening and poor sealing of existing wire installations. The rubber sealing ring is installed in the fourth sealing groove 604, and the protective cover 3 is fitted onto the outside of the upper connecting seat 6, so that the protruding edge 301 at the bottom of the protective cover 3 is tightly pressed and contacted with the sealing ring in the fourth sealing groove 604, completing the sealing assembly of the protective cover.

[0047] Next, lay the insulating sealing gasket 12 flat on top of the upper connector 6, cover it with the upper cover plate 13 and fix it with bolts. Tighten the bolts to make the upper cover plate 13 tightly press the insulating sealing gasket 12, so as to achieve dual protection of sealing and insulation at the top of the upper connector 6 and improve electrical safety. Finally, connect the locking connector 4 to the connecting pipe at the inlet end of the protective cover 3 by thread. Wrap the threaded connection with sealing PTFE tape to improve the sealing effect. Connect the outer end of the single strand wire 9 to the external wire 14 by crimping or welding. Pass the connected external wire 14 through the locking connector 4, tighten the locking nut of the locking connector 4, and tightly press the external wire 14 to complete the sealing and fixing of the external wire. At this point, the entire gas relay terminal sealing structure assembly is completed.

[0048] During use, the multi-layered, multi-point synergistic sealing structure comprehensively isolates transformer oil, moisture, dust, and corrosive gases, effectively preventing the leakage of internal flammable gas. Compared with existing structures, the probability of seal failure is significantly reduced. The multi-dimensional positioning and matching system ensures tight fit between components, effectively resisting the continuous operating vibration of the transformer and avoiding seal failure caused by wear or misalignment of the seals. At the same time, it ensures stable contact between the male pin 8 and the female pin 7 of the crown spring, preventing poor electrical contact and solving the core defects of existing structures. The comprehensive protection system blocks the intrusion of external debris and the accumulation of condensate, protecting the normal operation of internal electrical components. The synergistic effect of each component ensures that the entire sealing structure always maintains a reliable working state, ultimately guaranteeing the long-term stable operation of the gas relay terminals and improving the operational reliability of the gas relay and even the entire power transformer.

[0049] In this invention, unless otherwise explicitly specified and limited, for example, it can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements or an interaction between two elements. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A sealing structure for the terminals of a gas relay, characterized in that: The device includes a main connecting cover that is fixedly connected to a gas relay. A lower connecting seat, an upper connecting seat, and a protective cover are sequentially arranged on the top of the main connecting cover. The bottom end of the upper connecting seat is inserted into the top end of the lower connecting seat, and an outer shell is provided on the outer circumference of the connection between the upper and lower connecting seats. The wire inlet end of the protective cover is externally connected to a locking connector for installing wires. Both the wire inlet end and the locking connector of the protective cover are arranged obliquely downward.

2. A gas relay terminal seal structure as defined in claim 1, wherein: The main connecting cover has a through hole for installing the lower connecting seat. A first sealing groove is opened on the outer periphery of the top of the through hole. A sealing ring is provided in the first sealing groove. The lower connecting seat is inserted into the through hole and is in close contact with the sealing ring in the first sealing groove.

3. A gas relay terminal seal as defined in claim 1, wherein: The outer casing is fitted onto the outer wall of the lower connecting seat and fixedly connected to the main body connecting cover. The outer wall of the lower connecting seat is provided with a special-shaped flange, the shape of which is the same as the shape of the bottom outer wall of the outer casing, for the purpose of positioning the outer casing during installation.

4. A gas relay terminal seal as defined in claim 3, wherein: The top of the irregular flange is provided with a second sealing groove, and a sealing ring is provided in the second sealing groove. The bottom inner wall of the outer shell is in close contact with the sealing ring in the second sealing groove.

5. A gas relay terminal seal as defined in claim 1, wherein: The upper connecting seat has a plug-in platform at its bottom end, and the lower connecting seat has a plug-in interface at its top that is adapted to the plug-in platform. The inner wall of the plug-in interface has multiple positioning ribs, and the outer wall of the plug-in platform has a positioning groove that is adapted to the positioning ribs.

6. A gas relay terminal seal as defined in claim 1, wherein: The top of the outer casing has a third sealing groove, and a sealing ring is provided in the third sealing groove. The upper connecting seat is in close contact with the sealing ring in the third sealing groove.

7. A gas relay terminal seal as defined in claim 1 wherein: The upper connecting seat is provided with a fourth sealing groove, and a sealing ring is provided in the fourth sealing groove. The bottom of the protective cover is provided with a raised edge, and the inner wall of the bottom of the protective cover is in close contact with the sealing ring in the fourth sealing groove.

8. A gas relay terminal seal as defined in claim 1, wherein: The upper connecting seat is provided with a plurality of first mounting holes, in which a crown spring female pin is inserted. The lower connecting seat is provided with a plurality of crown spring male pins that are inserted into the crown spring female pins. The first mounting holes and the crown spring female pins have the same shape, both being T-shaped.

9. The gas relay terminal sealing structure as described in claim 1, characterized in that: The upper connecting seat is provided with an insulating sealing gasket at the top, and an upper cover plate is provided at the top of the insulating sealing gasket. The upper cover plate is fixedly connected to the upper connecting seat.

10. The sealing structure for a gas relay terminal as described in claim 8, characterized in that: The upper connecting seat has a plurality of second mounting holes on the side near the locking joint. The second mounting holes are stepped, and the inner diameter of the second mounting hole near the outer end is larger than the inner diameter of the inner end. A single-strand wire connected to the crown spring pin is inserted into the second mounting hole, and a sealing sleeve is provided at the connection between the second mounting hole and the single-strand wire. A sealing pressure plate for fixing the sealing sleeve is fixedly connected to the outside of the upper connecting seat.

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