Totally-enclosed gas insulated gas-insulated switchgear

Abstract

The utility model discloses a totally-enclosed gas-insulated gas-filled cabinet, and relates to the technical field of power equipment. The SF6 gas recovery device comprises an insulating gas-filled cabinet, wherein an SF6 gas recovery machine is arranged on one side of the insulating gas-filled cabinet. According to the utility model, the temperature and pressure changes of the SF6 gas in the insulated gas-insulated switchgear are monitored in real time through the temperature sensor and the pressure sensor, the gas flow direction is controlled by combining the electromagnetic gas self-control valve, the SF6 gas recovery machine is linked to realize closed-loop regulation, and when pressure abnormity caused by thermal expansion of the gas is detected, the system automatically starts a gas recovery and cooling program, so that the gas recovery efficiency is improved. The pressure and temperature in the cabinet are rapidly reduced, the failure of a sealing structure due to overpressure fatigue is avoided, the design of the U-shaped adjusting pipe and the inclined suction nozzle promotes the formation of stirring airflow during SF6 gas supplementation, the gas density is uniformly distributed, local insulation weak points are eliminated, the stability of the equipment under the frequent thermal load working condition is remarkably improved, the gas leakage risk is reduced, and the service life of the equipment is prolonged. The service life of equipment is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of power equipment technology, and in particular relates to a fully enclosed gas-insulated gas-filled cabinet. Background Technology

[0002] As power systems develop towards higher voltage and more compact designs, fully enclosed gas-insulated switchgear has been widely used in substations, urban power grids, and other fields due to its compact structure and strong environmental adaptability. SF6 gas, as the core insulating medium, has become the preferred medium for gas-insulated equipment due to its excellent insulation performance and arc-extinguishing capability. However, in actual operation, the electrical components inside the switchgear (such as circuit breakers and disconnectors) generate a large amount of heat during switching operations or short-circuit faults. This causes the temperature of the SF6 gas inside the sealed cavity to rise and expand in volume, resulting in a significant increase in internal pressure.

[0003] Traditional gas-insulated switchgear generally suffers from the following technical defects, lacking dynamic monitoring and adaptive adjustment mechanisms: Existing equipment mostly relies on safety valves with fixed pressure thresholds for passive pressure relief, failing to monitor the dynamic relationship between gas temperature and pressure in real time. This leads to pressure fluctuations exceeding design margins under frequent heat loads, causing fatigue failure of the sealing structure and even gas leakage. SF6 gas, as a strong greenhouse gas, not only affects the insulation performance of the equipment but also causes serious environmental problems. Uneven gas distribution and low recovery efficiency: Conventional gas-insulated switchgear often uses unidirectional straight-through pipes for gas replenishment. SF6 gas injection tends to form laminar flow, making uniform diffusion difficult. Insufficient gas density in local areas may lead to weak points in the insulation. To address these issues, we provide a fully enclosed gas-insulated switchgear to solve the problems mentioned above. Utility Model Content

[0004] The purpose of this utility model is to provide a fully enclosed gas-insulated gas filling cabinet. By coordinating the monitoring and adjustment components and the sealing components, it solves the problems in the prior art where equipment mostly relies on safety valves with fixed pressure thresholds for passive pressure relief, making it impossible to monitor the dynamic changes in gas temperature and pressure in real time, and where the gas filling cabinet often uses a unidirectional straight-through pipe, which easily forms laminar flow and makes it difficult to diffuse evenly when SF6 gas is injected.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to a fully enclosed gas-insulated gas-filled cabinet, comprising an insulated gas-filled cabinet, an SF6 gas recovery machine placed on one side of the insulated gas-filled cabinet, an air inlet pipe connected to the rear side of the SF6 gas recovery machine, and a delivery pipe connected to one side of the SF6 gas recovery machine. A monitoring and adjustment assembly is installed inside the insulated gas-filled cabinet. The monitoring and adjustment assembly includes an adjustment pipe fixedly connected inside the insulated gas-filled cabinet, a suction nozzle connected to the surface of the adjustment pipe, a monitoring block installed inside the insulated gas-filled cabinet, a temperature sensor fixedly connected to one side of the monitoring block, and a pressure sensor fixedly connected to one side of the monitoring block. A sealing assembly is installed on the surface of the monitoring block, the sealing assembly including a first sealing strip installed inside the insulated gas-filled cabinet, a second sealing strip fixedly connected to the surface of the monitoring block, and a sealing plate fixedly connected to one side of the monitoring block.

[0007] The present invention is further configured such that the top of the regulating pipe is connected to the air inlet pipe, and the surfaces of the air inlet pipe, the delivery pipe and the regulating pipe are all connected to electromagnetic gas self-control valves.

[0008] The present invention is further configured such that the shape of the regulating tube is U-shaped, and the suction nozzle consists of two rows of longitudinally inclined, uniformly connected to the surface of opposite sides of the regulating tube, with the inclination direction facing left and right.

[0009] The present invention is further configured such that an extension rod is fixedly connected to one side of the monitoring block inside the insulated gas-filled cabinet, and there are two extension rods. The temperature sensor is fixedly connected to the end of the top extension rod away from the monitoring block, and an aluminum alloy protective cover is fitted on the surface of the temperature sensor. The aluminum alloy protective cover is fixedly connected to the extension rod. The pressure sensor is fixedly connected to the end of the bottom extension rod away from the monitoring block. The pressure sensor is of model Yokogawa EJX-A.

[0010] The present invention is further configured such that a first sealing groove is provided inside the insulating gas-filled cabinet, and the first sealing strip is fixedly connected inside the first sealing groove.

[0011] The present invention is further configured such that a second sealing groove is formed on the surface of the monitoring block, the second sealing strip is fixedly connected in the second sealing groove, the second sealing strip is located inside the insulating gas-filled cabinet, and the material of the second sealing strip is a fluororubber expansion sealing strip.

[0012] The present invention is further provided that both the insulating gas-filled cabinet and the sealing plate are provided with fixing through holes, and fixing bolts are threadedly connected inside the fixing through holes.

[0013] The present invention has the following beneficial effects.

[0014] 1. This utility model uses temperature and pressure sensors to monitor the temperature and pressure changes of SF6 gas inside the insulated gas-filled cabinet in real time. Combined with an electromagnetic gas self-control valve to control the gas flow direction, it links with an SF6 gas recovery machine to achieve closed-loop control. When abnormal pressure is detected due to gas expansion caused by heat, the system automatically starts the gas recovery and cooling program to quickly reduce the pressure and temperature inside the cabinet, preventing the sealing structure from failing due to overpressure fatigue. The design of the U-shaped regulating pipe and the inclined suction nozzle promotes the formation of agitated airflow when replenishing SF6 gas, evenly distributing the gas density and eliminating local weak points in insulation. This mechanism significantly improves the stability of the equipment under frequent heat load conditions, reduces the risk of gas leakage, and extends the service life of the equipment.

[0015] 2. This utility model employs a dual-protection sealing component using a first sealing strip and a second fluororubber sealing strip. The first sealing strip is embedded in the cabinet groove to form a preliminary seal, while the fluororubber sealing strip expands through SF6 gas permeation, adaptively enhancing the sealing force and effectively coping with dynamic pressure changes caused by gas thermal expansion. The sealing plate is reinforced by fixing bolts to further resist sealing failure caused by mechanical vibration. This design not only solves the problems of traditional sealing materials being susceptible to corrosion and shrinkage, but also significantly reduces the probability of SF6 gas leakage, reduces greenhouse gas emissions, meets environmental protection requirements, and improves the long-term reliability of the equipment.

[0016] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of a fully enclosed gas-insulated gas-filled switchgear.

[0019] Figure 2 This is a three-dimensional schematic diagram of the regulating pipe in a fully enclosed gas-insulated gas-filled cabinet.

[0020] Figure 3 This is a three-dimensional schematic diagram of a temperature sensor and a pressure sensor in a fully enclosed gas-insulated gas-filled cabinet.

[0021] Figure 4 This is an explosion diagram of a sealing component in a fully enclosed gas-insulated gas-filled cabinet.

[0022] Figure 5 This is a schematic diagram of the sealing components in a fully enclosed gas-insulated gas-filled cabinet.

[0023] In the attached diagram: 1. Insulating gas filling cabinet; 2. SF6 gas recovery machine; 3. Inlet pipe; 4. Delivery pipe; 5. Monitoring and regulating assembly; 501. Regulating pipe; 502. Suction nozzle; 503. Monitoring block; 504. Temperature sensor; 505. Pressure sensor; 6. Sealing assembly; 601. First sealing strip; 602. Second sealing strip; 603. Sealing plate; 7. Electromagnetic gas self-control valve; 8. Extension rod; 9. Aluminum alloy protective cover. Detailed Implementation

[0024] 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 skilled in the art without creative effort are within the protection scope of the present utility model. Specific Implementation Example 1

[0026] Please see Figure 1-5This utility model relates to a fully enclosed gas-insulated gas-filled cabinet, comprising an insulated gas-filled cabinet 1, an SF6 gas recovery machine 2 placed on one side of the insulated gas-filled cabinet 1, an inlet pipe 3 connected to the rear side of the SF6 gas recovery machine 2, and a delivery pipe 4 connected to one side of the SF6 gas recovery machine 2. A cooling system is fixedly connected inside the insulated gas-filled cabinet 1, the cooling system including coolant, pump, cooler, and cooling pipes, etc., the cooling pipes being located inside the insulated gas-filled cabinet 1. The cooling system is a commonly used cooling method in existing fully enclosed gas-insulated gas-filled cabinets and is prior art; therefore, its working principle will not be described in detail here. Through the setting of the cooling system, when SF6 gas... When expansion occurs, the temperature inside the insulating gas filling cabinet 1 is reduced in a timely manner. The insulating gas filling cabinet 1 is equipped with a monitoring and adjustment component 5, which includes an adjustment pipe 501 fixedly connected inside the insulating gas filling cabinet 1, a suction nozzle 502 connected to the surface of the adjustment pipe 501, a monitoring block 503 located inside the insulating gas filling cabinet 1, a temperature sensor 504 fixedly connected to one side of the monitoring block 503, and a pressure sensor 505 fixedly connected to one side of the monitoring block 503. The temperature sensor 504 and the pressure sensor 505 monitor the temperature and pressure changes of the SF6 gas inside the insulating gas filling cabinet 1 in real time to determine whether the gas has increased in pressure due to thermal expansion. In case of an anomaly, the electromagnetic gas self-control valve 7 controls the gas flow direction of the inlet pipe 3, delivery pipe 4, and regulating pipe 501. Combined with the SF6 gas recovery machine 2, it actively recovers or replenishes gas to achieve dynamic pressure balance. The suction nozzle 502 with its inclined surface design on the U-shaped regulating pipe 501 generates agitated airflow during gas replenishment, promoting uniform diffusion of SF6 gas and avoiding localized weak points in insulation. The monitoring and regulating component 5 solves the problem of pressure runaway caused by thermal expansion in traditional gas filling cabinets through real-time monitoring and automatic control, while optimizing gas distribution. The monitoring block 503 is equipped with a sealing component 6, which includes a first sealing strip 60 installed inside the insulating gas filling cabinet 1. 1. A second sealing strip 602 is fixedly connected to the surface of the monitoring block 503, and a sealing plate 603 is fixedly connected to one side of the monitoring block 503. The first sealing strip 601 is embedded in the first sealing groove of the insulating gas-filled cabinet 1 to initially seal the contact surface between the monitoring block 503 and the cabinet. The second sealing strip 602 is made of fluororubber material and is fixedly connected to the second sealing groove of the monitoring block 503. It enhances the sealing force by inducing expansion through gas permeation. The sealing component 6 has a double dynamic sealing design to ensure long-term stable sealing of SF6 gas under high temperature and high pressure environment. The two work together to significantly improve the safety, environmental protection and operational reliability of the equipment. Specific Implementation Example 2

[0028] Please see Figure 1-5Based on specific embodiment 1, the top of the regulating pipe 501 is connected to the inlet pipe 3, and the end of the delivery pipe 4 away from the SF6 gas recovery machine 2 is connected to the inlet pipe 3. Electromagnetic gas self-control valves 7 are connected to the surfaces of the inlet pipe 3, delivery pipe 4, and regulating pipe 501. This is prior art, and this solution will not be elaborated upon further. Those skilled in the art can clearly understand the working principle. The electromagnetic gas self-control valve 7 is used to control the delivery direction of SF6 gas. The regulating pipe 501 is U-shaped, and the suction nozzles 502 are arranged in two rows, longitudinally inclined and evenly connected to the surfaces of opposite sides of the regulating pipe 501, with the inclination direction facing left and right. This inclined design of the suction nozzles 502, when replenishing SF6 gas, can promote the SF6 gas flow in the insulating gas filling cabinet 1. The process generates agitation, allowing the SF6 gas to be evenly distributed within the insulating gas filling cabinet 1. Two extension rods 8 are fixedly connected to one side of the monitoring block 503 inside the insulating gas filling cabinet 1. A temperature sensor 504 is fixedly connected to the end of the top extension rod 8 furthest from the monitoring block 503, and an aluminum alloy protective cover 9 is fitted onto the surface of the temperature sensor 504. The aluminum alloy protective cover 9 is fixedly connected to the extension rod 8. A pressure sensor 505 (Yokogawa EJX-A model) is fixedly connected to the end of the bottom extension rod 8 furthest from the monitoring block 503. The extension rods 8 not only fix the temperature sensor 504 and pressure sensor 505 but also extend them to the axial position of the insulating gas filling cabinet 1, thus providing better monitoring. To measure SF6 gas and determine if it expands due to temperature, an aluminum alloy protective cover 9 is used to protect the temperature sensor 504 from corrosion without affecting its temperature measurement performance. The Yokogawa EJX-A pressure sensor 505 is a dedicated sensor for SF6 gas monitoring, capable of long-term stable operation in SF6 gas environments for pressure monitoring. Both the temperature sensor 504 and pressure sensor 505 are existing technologies and will not be elaborated further in this solution; their working principles are readily understood by technical personnel. The insulating gas filling cabinet 1 has a first sealing groove inside, and a first sealing strip 601 is fixedly connected inside this groove. The first sealing groove and the first sealing strip 601... The system is configured to perform an initial seal at the contact point between the insulating gas-filled cabinet 1 and the sealing block. A second sealing groove is formed on the surface of the monitoring block 503, and a second sealing strip 602 is fixedly connected within this groove. The second sealing strip 602 is located inside the insulating gas-filled cabinet 1 and is made of fluororubber expansion sealing strip. Through the arrangement of the second sealing groove and the second sealing strip 602, the monitoring block 503 is sealed again, preventing SF6 gas leakage from the monitoring block 503. The fluororubber expansion sealing strip has excellent chemical corrosion resistance, allowing SF6 gas molecules to penetrate the microstructure of the fluororubber. The gas molecules interact with the rubber material, causing the rubber to expand in volume. This expansion mechanism increases the sealing force of the sealing strip.To prevent SF6 gas leakage, both the insulating gas filling cabinet 1 and the sealing plate 603 have internal fixing through holes. Fixing bolts are threaded into these through holes, allowing the sealing plate 603 to be securely fixed to the insulating gas filling cabinet 1.

[0029] The working principle of this utility model is as follows: The monitoring block 503 and the extension rod 8 are inserted into the insulating gas filling cabinet 1 through the first sealing groove on the insulating gas filling cabinet 1. The sealing plate 603 is fixed to the insulating gas filling cabinet 1 using fixing bolts. At this time, the temperature sensor 504 and the pressure sensor 505 are both located inside the insulating gas filling cabinet 1. During the use of the insulating gas filling cabinet 1, the temperature sensor 504 monitors the temperature change of SF6 gas, and the pressure sensor 505 monitors the gas pressure change. When both temperature and pressure increase, it indicates that the SF6 gas has expanded. The temperature sensor 504 and the pressure sensor 505 transmit the monitored values ​​to the external control terminal. The external control terminal starts the cooling system inside the SF6 gas recovery machine 2 and the insulating gas filling cabinet 1. The recovery pump in the SF6 gas recovery machine 2 generates suction (at this time, the electromagnetic gas self-control valve 7 on the surface of the inlet pipe 3 and the regulating pipe 501 is in the open state, and the electromagnetic gas self-control valve 7 on the surface of the delivery pipe 4 is in the closed state). At this time, the gas in the insulating gas filling cabinet 1 passes through the suction nozzle 5. 02. The gas enters the regulating pipe 501, then the inlet pipe 3, and finally the purification system in the SF6 gas recovery machine 2. The gas is purified and removed from impurities. After being compressed by the compression system, the purified gas is stored in the storage system. By extracting some of the SF6 gas, the insulating gas filling cabinet 1 is kept at a suitable pressure to prevent the expanded gas from impacting the sealing material and causing gas leakage. Then, the cooling system cools the insulating gas filling cabinet 1 to prevent the temperature from rising continuously. When the internal temperature of the insulating gas filling cabinet 1 and the SF6 gas are stable, the SF6 gas recovery machine 2 delivers the stored gas to the regulating pipe 501 through the delivery pipe 4 (at this time, the electromagnetic gas self-control valve 7 on the surface of the delivery pipe 4 and the regulating pipe 501 is in the open state, and the electromagnetic gas self-control valve 7 on the surface of the inlet pipe 3 is in the closed state). The gas is then replenished into the insulating gas filling cabinet 1 through the suction nozzle 502 on the regulating pipe 501. Since the suction nozzle 502 is designed at an angle, it can evenly distribute the gas into the insulating gas filling cabinet 1.

[0030] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A fully enclosed gas-insulated gas-filled cabinet, comprising an insulated gas-filled cabinet (1), characterized in that; An SF6 gas recovery machine (2) is placed on one side of the insulating gas cabinet (1), an air inlet pipe (3) is connected to the rear side of the SF6 gas recovery machine (2), and a delivery pipe (4) is connected to one side of the SF6 gas recovery machine (2). The insulating gas filling cabinet (1) is equipped with a monitoring and adjustment component (5). The monitoring and adjustment component (5) includes an adjustment pipe (501) fixedly connected inside the insulating gas filling cabinet (1), a suction nozzle (502) connected to the surface of the adjustment pipe (501), a monitoring block (503) set inside the insulating gas filling cabinet (1), a temperature sensor (504) fixedly connected to one side of the monitoring block (503), and a pressure sensor (505) fixedly connected to one side of the monitoring block (503). The surface of the monitoring block (503) is provided with a sealing assembly (6), which includes a first sealing strip (601) disposed inside the insulating gas-filled cabinet (1), a second sealing strip (602) fixedly connected to the surface of the monitoring block (503), and a sealing plate (603) fixedly connected to one side of the monitoring block (503).

2. The fully enclosed gas-insulated gas-filled switchgear according to claim 1, characterized in that, The top of the regulating pipe (501) is connected to the air inlet pipe (3), and the surfaces of the air inlet pipe (3), the delivery pipe (4) and the regulating pipe (501) are all connected to electromagnetic gas self-control valves (7).

3. The fully enclosed gas-insulated gas-filled switchgear according to claim 1, characterized in that, The regulating tube (501) is U-shaped, and the suction nozzle (502) consists of two rows of longitudinally inclined, uniformly connected surfaces on opposite sides of the regulating tube (501), with the inclination direction facing left and right.

4. The fully enclosed gas-insulated gas-filled switchgear according to claim 1, characterized in that, The monitoring block (503) is located inside the insulating gas-filled cabinet (1) and is fixedly connected to an extension rod (8). There are two extension rods (8). The temperature sensor (504) is fixedly connected to the end of the top extension rod (8) away from the monitoring block (503). The surface of the temperature sensor (504) is covered with an aluminum alloy protective cover (9). The aluminum alloy protective cover (9) is fixedly connected to the extension rod (8). The pressure sensor (505) is fixedly connected to the end of the bottom extension rod (8) away from the monitoring block (503). The pressure sensor (505) is a Yokogawa EJX-A.

5. A fully enclosed gas-insulated gas-filled switchgear according to claim 1, characterized in that, The insulating gas-filled cabinet (1) has a first sealing groove inside, and the first sealing strip (601) is fixedly connected inside the first sealing groove.

6. The fully enclosed gas-insulated gas-filled switchgear according to claim 1, characterized in that, The monitoring block (503) has a second sealing groove on its surface. The second sealing strip (602) is fixedly connected in the second sealing groove. The second sealing strip (602) is located inside the insulating gas filling cabinet (1), and the material of the second sealing strip (602) is a fluororubber expansion sealing strip.

7. A fully enclosed gas-insulated gas-filled switchgear according to claim 1, characterized in that, Both the insulating gas-filled cabinet (1) and the sealing plate (603) have fixed through holes inside, and fixed bolts are threaded inside the fixed through holes.

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