Observation window and high-pressure gas insulated switchgear

Abstract

The invention relates to the technical field of parts of shells of switchboards, transformer substations or switching devices for power supply or power distribution, in particular to an observation window and high-pressure gas insulated switchgear. The observation window comprises an observation window flange used for being in bolted connection with a shell of the high-pressure gas insulated switchgear, a gland is connected to the outer side of the observation window flange, the observation window flange and the gland are both annular, a glass plate is pressed on the observation window flange through the gland, and a sealing ring is arranged between the observation window flange and the glass plate. A protective gasket is clamped between the gland and the glass plate; according to the observation window, double sealing is achieved, meanwhile, the glass plate cannot be damaged, the assembly process is simple, and use is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of parts of a switchboard, a transformer substation or a switchgear housing for power supply or distribution, and in particular to an observation window and a high-voltage gas-insulated switchgear. Background Art

[0002] With the sharp increase in people's demand for electricity, the power system has developed rapidly. More and more distribution boards, substations and gas-insulated switchgear have been gradually established, and most of them are located in remote geographical locations and in harsh weather environments. Therefore, the use requirements of distribution boards, substations and gas-insulated switchgear are getting higher and higher. The widely used gas-insulated switchgear is gradually developing in the direction of miniaturization. At the same time, electrical components such as busbars, circuit breakers, disconnectors, mutual inductors, grounding switches, and lightning arresters are all installed inside the gas-insulated switchgear, resulting in a small space inside the gas-insulated switchgear. The electric field generated when the equipment is working is relatively concentrated, and electrical faults are prone to occur. Once a fault occurs, it usually leads to a large-scale power outage for maintenance. At this time, the gas in the equipment needs to be recovered first, and then the equipment needs to be disassembled to find the cause of the fault. The entire maintenance process is very troublesome and time-consuming.

[0003] In order to reduce the failure rate of equipment, an observation window is usually installed on the gas-insulated switchgear. In combination with signal detection, the inside of the gas-insulated switchgear is continuously observed and monitored through the observation window, so that defects inside the equipment can be discovered in time and pre-emptively dealt with, thereby avoiding major accidents. In the prior art, a Chinese utility model patent with authorization announcement number CN202308893U and authorization announcement date 2012.07.04 discloses a visible gas-insulated metal-enclosed switchgear, which includes a cover plate, a viewing window and a ring pressure flange. The viewing window is fixedly assembled between the cover plate and the ring pressure flange. When in use, the cover plate is first assembled on the outer shell of the device by bolts, and then the viewing window is embedded in the ring pressure flange, and the ring pressure flange with the viewing window embedded is assembled to the cover plate by screws. During this process, a gap is formed between the ring pressure flange and the viewing window to prevent the ring pressure flange from directly squeezing the viewing window and causing damage to the viewing window; in addition, sealing rings are respectively provided on the end surface where the cover plate and the outer shell of the device are connected, between the outer peripheral surface of the viewing window and the inner peripheral surface of the ring pressure flange, and between the contact end surfaces of the two to ensure sealing performance.

[0004] In the above solution, there is a gap between the viewing window and the annular pressure flange, and a sealing ring is provided between the contact end faces of the viewing window and the annular pressure flange. During actual assembly, the annular pressure flange is assembled on the cover plate by screws. During this process, it is necessary to ensure that the sealing ring is pressed tightly against the viewing window to achieve sealing, and it is also necessary to ensure that there is a gap between the viewing window and the annular pressure flange, which makes assembly difficult, time-consuming, and inconvenient to use. Summary of the Invention

[0005] The present invention aims to provide an observation window that addresses the existing technical issues of ensuring that the sealing ring is pressed tightly against the observation window to achieve a seal, while also ensuring a gap between the observation window and the pressure flange, resulting in difficulty in assembly, time consumption, and inconvenience. Furthermore, the present invention aims to provide a high-voltage gas-insulated switchgear that, by installing the aforementioned observation window, addresses the existing technical issues of difficulty, time consumption, and inconvenience in assembly of observation windows on switchgear.

[0006] To achieve the above objectives, the observation window of the present invention adopts the following technical solutions: An observation window includes an observation window flange for being bolted to the housing of a high-voltage gas-insulated switchgear. A gland is connected to the outer side of the observation window flange. Both the observation window flange and the gland are annular. The gland presses a glass plate against the observation window flange. A sealing ring is provided between the observation window flange and the glass plate. A protective gasket is sandwiched between the gland and the glass plate.

[0007] Furthermore, a mounting groove adapted to the shape of the glass plate is provided on the observation window flange, and the sealing ring is located at the bottom of the mounting groove.

[0008] Furthermore, the depth of the mounting groove is equal to the thickness of the glass plate.

[0009] Furthermore, the end surface of the pressure cover facing the glass plate is provided with a receiving groove adapted to the shape of the glass plate, and a protective gasket is provided at the bottom of the receiving groove, and the thickness of the protective gasket is greater than the depth of the receiving groove.

[0010] Furthermore, the observation window flange and the gland are respectively provided with mounting through holes, so that bolts can pass through the mounting through holes on the observation window flange and the gland at the same time to connect with the housing of the high-voltage gas-insulated switchgear.

[0011] Beneficial Effects: The observation window of the present invention is a groundbreaking invention. By connecting a gland to the outside of the observation window flange and installing a glass plate between the observation window flange and the gland, the gland compresses the glass plate, preventing movement of the glass plate and improving connection reliability. During use, the observation window flange is bolted to the housing of the high-voltage gas-insulated switchgear, and a sealing ring is provided between the observation window flange and the glass plate. This improves sealing performance and prevents leakage of high-pressure gas within the high-voltage gas-insulated switchgear. A protective gasket is sandwiched between the gland and the glass plate. The protective gasket can contact the glass plate and isolate the glass plate from the gland, preventing damage to the glass plate caused by direct contact and compression between the gland and the glass plate. The present invention achieves sealing without damaging the glass plate, and the assembly process is simple and convenient to use.

[0012] The high-voltage gas-insulated switchgear of the present invention adopts the following technical solutions: A high-voltage gas-insulated switchgear comprises a shell, an observation port is provided on the shell, a connecting flange is provided at the observation port, an observation window is connected to the connecting flange, the observation window comprises an observation window flange for being bolted to the shell, a pressure cover is connected to the outer side of the observation window flange, both the observation window flange and the pressure cover are annular, the pressure cover presses the glass plate onto the observation window flange, a sealing ring is provided between the observation window flange and the glass plate, and a protective gasket is clamped between the pressure cover and the glass plate.

[0013] Furthermore, a mounting groove adapted to the shape of the glass plate is provided on the observation window flange, and the sealing ring is located at the bottom of the mounting groove.

[0014] Furthermore, the depth of the mounting groove is equal to the thickness of the glass plate.

[0015] Furthermore, the end surface of the pressure cover facing the glass plate is provided with a receiving groove adapted to the shape of the glass plate, and a protective gasket is provided at the bottom of the receiving groove, and the thickness of the protective gasket is greater than the depth of the receiving groove.

[0016] Furthermore, the observation window flange and the gland are respectively provided with mounting through holes, so that bolts can pass through the mounting through holes on the observation window flange and the gland at the same time to connect with the housing of the high-voltage gas-insulated switchgear.

[0017] Furthermore, a sealing ring is provided on the connecting surface between the observation window flange and the connecting flange of the observation window.

[0018] Furthermore, the sealing ring is mounted on the observation window flange.

[0019] Furthermore, the inner diameter of the connecting flange is not smaller than the inner diameter of the observation window flange.

[0020] Furthermore, the inner diameter of the observation window flange is not less than the diameter of the observation port on the shell.

[0021] Beneficial Effects: The high-voltage gas-insulated switchgear of the present invention is an improved invention. By connecting a gland to the outside of the observation window flange and installing a glass plate between the observation window flange and the gland, the gland presses the glass plate tightly, thereby preventing the glass plate from moving and improving connection reliability. During use, the observation window flange is bolted to the housing of the high-voltage gas-insulated switchgear, and a sealing ring is provided between the observation window flange and the glass plate. This improves sealing performance and prevents leakage of high-pressure gas within the high-voltage gas-insulated switchgear. A protective gasket is sandwiched between the gland and the glass plate. The protective gasket can contact the glass plate and isolate the glass plate from the gland, preventing the gland from directly contacting and squeezing the glass plate and causing damage to the glass plate. The present invention achieves sealing without damaging the glass plate, and the assembly process is simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the observation window of the present invention; Figure 2 Schematic diagram of the structure of an observation window flange in one embodiment of the observation window of the present invention; Figure 3 This is a schematic structural diagram of a gland in one embodiment of an observation window of the present invention; Figure 4 A schematic diagram of the connection structure between an embodiment of an observation window of the present invention and an embodiment of a high-voltage gas-insulated switchgear; Figure 5 The figure is a schematic diagram of the connection structure between one embodiment of the observation window of the present invention and another embodiment of the high-voltage gas-insulated switchgear.

[0023] In the figure: 1. Shell; 2. Bolt; 3. Observation window flange; 4. Glass plate; 5. Sealing ring; 6. Pressure cover; 7. Protective gasket; 8. Mounting through hole; 9. Observation window; 10. Connecting flange; 11. Mounting groove; 12. Receiving groove; 13. Observation port. DETAILED DESCRIPTION

[0024] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0025] The present invention is directed to the observation window installed on the existing high-voltage gas-insulated switchgear housing. When the glass plate is pressed against the observation window flange by the pressure cover to ensure reliable sealing, the glass plate is easily cracked. In order to avoid cracking the glass plate, a certain pressing force is retained, which leads to a contradiction of reduced sealing reliability. A protective gasket is set between the pressure cover and the glass plate to isolate the two and avoid direct squeezing. At the same time, the protective gasket's own deformation ability acts as a buffer to avoid the problem that the glass plate is easily cracked when the pressure cover applies a large pressing force to the glass plate to ensure sealing. Based on the above inventive concept, the present invention proposes an observation window and a high-voltage gas-insulated switchgear. By setting a protective gasket between the glass plate and the pressure cover, the glass plate is isolated, protected and pressed, forming a good sealing effect.

[0026] Embodiments of the observation window of the present invention: See Figures 1 to 3As a basic embodiment of the present invention, the observation window includes an observation window flange 3 for connecting to the housing 1 of the high-voltage gas-insulated switchgear through bolts 2. A gland 6 is connected to the outside of the observation window flange 3. Both the observation window flange 3 and the gland 6 are annular. The gland 6 presses the glass plate 4 onto the observation window flange 3. A sealing ring 5 is provided between the observation window flange 3 and the glass plate 4. A protective gasket 7 is sandwiched between the gland 6 and the glass plate 4. By connecting the gland 6 to the outside of the observation window flange 3 and sandwiching the glass plate 4 between the observation window flange 3 and the gland 6, the glass plate 4 is pressed by the gland 6 to prevent the glass plate 4 from being swayed. The connection reliability is good; when in use, the observation window flange 3 is connected to the housing 1 of the high-voltage gas-insulated switchgear with bolts 2, and a sealing ring 5 is arranged between the observation window flange 3 and the glass plate 4, which can improve the sealing performance and prevent the high-pressure gas inside the high-voltage gas-insulated switchgear from leaking. At the same time, a protective gasket 7 is clamped between the pressure cover 6 and the glass plate 4. The protective gasket 7 can contact with the glass plate 4 and isolate the glass plate 4 and the pressure cover 6, avoiding direct contact and squeezing between the pressure cover 6 and the glass plate 4 to cause damage to the glass plate 4. The observation window 9 achieves sealing without causing damage to the glass plate 4. The assembly process is simple and easy to use.

[0027] As a preferred embodiment of the present invention, the observation window flange 3 is provided with a mounting groove 11 that matches the shape of the glass plate 4. The sealing ring 5 is located at the bottom of the mounting groove 11. In this embodiment, the glass plate 4 is installed in the mounting groove 11, which can limit the position of the glass plate 4 and prevent it from moving radially along the observation window flange 3. At the same time, the sealing ring 5 forms a seal between the observation window flange 3 and the glass plate 4, preventing high-pressure gas from leaking through the gap between the observation window flange 3 and the glass plate 4. In other embodiments, the glass plate 4 can be directly pre-installed on the observation window flange 3 using adhesive or other means without assembling the glass plate 4 through the mounting groove 11, which can also achieve preliminary positioning of the glass plate 4.

[0028] As a preferred embodiment of the present invention, the groove depth of the mounting groove 11 is equal to the thickness of the glass plate 4. At this time, the glass plate 4 is installed in the mounting groove 11, and the outer side surface of the glass plate 4 is flush with the outer end surface of the observation window flange 3, and the adaptability is good. In other embodiments, the thickness of the glass plate 4 can also be greater than or less than the groove depth of the mounting groove 11. When the thickness of the glass plate 4 is greater than the groove depth of the mounting groove 11, the outer end of the glass plate 4 extends out of the observation window flange 3. At this time, the thickness of the protective gasket 7 can be reduced to ensure that the glass plate 4 and the protective gasket 7 can be stably assembled between the pressure cover 6 and the observation window flange 3. A corresponding avoidance groove is provided on the pressure cover 6 to avoid the end of the glass plate 4 extending outside the observation window flange 3. At the same time, the protective gasket 7 is installed in the avoidance groove to isolate the contact between the glass plate 4 and the pressure cover 6. When the thickness of the glass plate 4 is less than the groove depth of the installation groove 11, the outer end surface of the glass plate 4 is lower than the outer end surface of the observation window flange 3. At this time, the thickness of the protective gasket 7 can be increased to ensure that the protective gasket 7 can still be pressed tightly against the surface of the glass plate 4. A protrusion close to the observation window flange 3 can also be provided on the pressure cover 6, and the protective gasket 7 can be clamped between the glass plate 4 and the protrusion to achieve protection and compression of the glass plate 4.

[0029] As a preferred embodiment of the present invention, the end face of the pressure cover 6 facing the glass plate 4 is provided with a receiving groove 12 adapted to the shape of the glass plate 4, and the protective gasket 7 is provided at the bottom of the receiving groove 12. The thickness of the protective gasket 7 is greater than the groove depth of the receiving groove 12, that is, the end face of the protective gasket 7 will extend out of the pressure cover 6. Since the thickness of the glass plate 4 is equal to the groove depth of the installation groove 11, the end of the protective gasket 7 extending out of the pressure cover 6 will contact and deform with the end face of the glass plate 4, thereby achieving compression, that is, the protective gasket 7 can form isolation protection for the glass plate 4 and the pressure cover 6 while also achieving sealing between the glass plate 4 and the pressure cover 6. In other embodiments, the thickness of the protective gasket 7 may also be smaller than the depth of the accommodating groove 12. In this case, the thickness of the glass plate 4 needs to be greater than the depth of the mounting groove 11 to ensure that the end of the glass plate 4 extending out of the observation window flange 3 can enter the accommodating groove 12 and be pressed tightly against the protective gasket 7; in other embodiments, the accommodating groove 12 may also not be provided, and the protective gasket 7 may be directly clamped between the pressure cover 6 and the glass plate 4 to achieve isolation protection and compression sealing of the pressure cover 6 and the glass plate 4.

[0030] As a preferred embodiment of the present invention, the observation window flange 3 and the gland 6 are respectively provided with mounting holes 8, so that bolts 2 can pass through the mounting holes 8 on the observation window flange 3 and the gland 6 to connect with the housing 1 of the high-voltage gas-insulated switchgear. In this arrangement, only the same bolt 2 is required to achieve a stable connection between the gland 6, the observation window flange 3 and the housing 1 of the high-voltage gas-insulated switchgear, which has high connection reliability, good integrity and easy assembly. In other embodiments, the mounting holes 8 on the observation window flange 3 and the gland 6 can also be staggered. During installation, the observation window flange 3 is first connected to the high-voltage gas-insulated switchgear by bolts 2, and then the gland 6 is connected to the observation window flange 3 by another bolt 2. This can also achieve a stable connection between the gland 6, the observation window flange 3 and the high-voltage gas-insulated switchgear. For example, the connection method of the housing body, cover plate and ring pressure flange in a visible gas-insulated metal-enclosed switchgear cited in the background technology is adopted.

[0031] As a preferred embodiment of the present invention, a sealing ring 5 is also installed on the end face where the observation window flange 3 connects to the housing 1 of the high-voltage gas-insulated switchgear to ensure a sealed connection between the observation window flange 3 and the housing 1, thereby preventing the high-pressure gas in the high-voltage gas-insulated switchgear from leaking from the gap between the observation window flange 3 and the housing 1.

[0032] The installation process of the observation window of the present invention is as follows: first, the glass plate 4 is installed into the installation groove 11 of the observation window flange 3, and the protective gasket 7 is installed into the receiving groove 12 of the pressure cover 6. At this time, the glass plate 4 is flush with the observation window flange 3, and the protective gasket 7 extends out of the pressure cover 6. One end of the pressure cover 6 equipped with the protective gasket 7 is docked with the end of the observation window flange 3 equipped with the glass plate 4, so that the pressure cover 6 is aligned with the installation through hole 8 of the observation window flange 3, and the bolts 2 are simultaneously engaged in the installation through holes 8 of the pressure cover 6 and the observation window flange 3 to form a preliminary connection. Then, the pressure cover 6 and the observation window flange 3, which are preliminarily connected by the bolts 2, are docked with the housing 1 of the high-voltage gas-insulated switchgear and tightened by the bolts 2. During the tightening process of the bolts 2, the pressure cover 6 approaches the observation window flange 3 and presses the protective gasket 7 against the glass plate 4, isolating and protecting the glass plate 4 while achieving sealing. The internal situation of the high-voltage gas-insulated switchgear can be observed and monitored through the observation window 9, which is convenient for timely discovery of defects or faults inside the equipment, so as to preemptively deal with them and avoid major accidents.

[0033] Embodiments of the high-voltage gas-insulated switchgear of the present invention: See Figures 4 and 5The high-voltage gas-insulated switchgear of the present invention includes a housing 1 and the above-mentioned observation window 9. A connecting flange 10 is welded on the housing 1 of the high-voltage gas-insulated switchgear. By installing the observation window flange 3 of the observation window 9 on the connecting flange 10 through bolts 2, the interior of the equipment can be observed and monitored. In other embodiments, a hollow frame can be welded on the housing 1 of the high-voltage gas-insulated switchgear, and the observation window 9 can be installed on the hollow frame, or the observation window 9 can be directly installed on the housing 1 of the equipment, both of which can realize observation and monitoring of the interior of the equipment and ensure the normal operation of the high-voltage gas-insulated switchgear.

[0034] During the specific installation, it is necessary to first open an observation port 13 on the shell 1 of the equipment, and weld the connecting flange 10 to the outside of the observation port 13. Here, the inner aperture of the connecting flange 10 is not less than the inner aperture of the observation window flange 3, and the inner aperture of the observation window flange 3 is not less than the diameter of the observation port 13 to ensure good sealing. Finally, the observation window 9 is installed on the connecting flange 10 through the bolt 2, and the internal working conditions of the equipment can be observed through the glass plate 4. At the same time, a sealing ring 5 is provided on the connecting surface of the observation window flange 3 and the connecting flange 10 to prevent the high-pressure gas inside the equipment from leaking along the gap between the observation window flange 3 and the connecting flange 10. Here, the sealing ring 5 can be installed on the observation window flange 3 or on the connecting flange 10. In addition, the detachable connection through the bolt 2 facilitates the disassembly and maintenance of the observation window 9, and the above-mentioned observation window 9 can be installed on high-voltage gas-insulated switchgear of any shape, and can also be installed on any pressure vessel, and has strong applicability.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Any equivalent structural changes made using the description and drawings of the present invention shall be included in the scope of protection of the present invention.

Claims

1. An observation window, characterized in that: It includes an observation window flange for being bolted to the housing of a high-voltage gas-insulated switchgear. A pressure cover is connected to the outside of the observation window flange. Both the observation window flange and the pressure cover are annular. The pressure cover presses the glass plate onto the observation window flange. A sealing ring is provided between the observation window flange and the glass plate, and a protective gasket is clamped between the pressure cover and the glass plate.

2. The observation window according to claim 1, wherein: The observation window flange is provided with a mounting groove adapted to the shape of the glass plate, and the sealing ring is located at the bottom of the mounting groove.

3. The observation window according to claim 2, characterized in that: The depth of the mounting groove is equal to the thickness of the glass plate.

4. The observation window according to claim 1, wherein: The end surface of the pressure cover facing the glass plate is provided with a receiving groove adapted to the shape of the glass plate, and a protective gasket is arranged at the bottom of the receiving groove, and the thickness of the protective gasket is greater than the depth of the receiving groove.

5. The observation window according to any one of claims 1 to 4, characterized in that: The observation window flange and the gland are respectively provided with mounting through holes, so that bolts can pass through the mounting through holes on the observation window flange and the gland at the same time to connect with the shell of the high-voltage gas-insulated switchgear.

6. A high-voltage gas-insulated switchgear comprising a housing, an observation port being provided on the housing, a connecting flange being provided at the observation port, and an observation window being connected to the connecting flange, wherein: The observation window is the observation window according to any one of claims 1 to 5.

7. The high-voltage gas-insulated switchgear according to claim 6, characterized in that: A sealing ring is provided on the connecting surface between the observation window flange and the connecting flange of the observation window.

8. The high-voltage gas-insulated switchgear according to claim 7, characterized in that: The sealing ring is mounted on the observation window flange.

9. The high-voltage gas-insulated switchgear according to any one of claims 6 to 8, characterized in that: The inner diameter of the connecting flange is not less than the inner diameter of the observation window flange.

10. The high-voltage gas-insulated switchgear according to any one of claims 6 to 8, characterized in that: The inner diameter of the observation window flange is not less than the diameter of the observation port on the shell.

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