Gas-insulated switchgear plug airtight leak detection tool

Abstract

The utility model relates to the technical field of epoxy resin vacuum impregnated paper solid insulation tubular bus detection, in particular to an airtight leak detection tool for a gas-insulated switchgear plug, which is characterized in that a gas chamber is arranged in a tank body, an opening communicated with the gas chamber is arranged on one side of the tank body, and the opening is provided with a connecting part; the adaptive flange and the connecting part are detachably fixed, a center hole of the adaptive flange is used for providing a channel for a gas-insulated switchgear plug to extend into the gas chamber, a plurality of connecting holes are formed in the adaptive flange in the circumferential direction, and the connecting holes are used for being connected with a pressing ring so that the bonding flange can be detachably fixed to the adaptive flange; the inflating and deflating pipe is connected with the tank body and is communicated with the air chamber; one end of the pressure measuring pipe is connected with the tank body and communicated with the air chamber, and the other end of the pressure measuring pipe is provided with a pressure measuring device to detect the air pressure in the air chamber. The air tightness of the product can be determined before the product leaves the factory, and corresponding finishing is performed, so that the problem that the product needs to be returned to the factory for finishing after air leakage is detected after being transported to the field for installation, time is delayed during back-and-forth transportation, and cost is increased is avoided.

Description

Technical Field

[0001] This utility model relates to the field of epoxy resin vacuum impregnated paper solid insulation tubular busbar testing technology, specifically a gas-tight leak detection tool for gas-filled switchgear plugs. Background Technology

[0002] To reduce size and floor space, switchgear typically uses gas-insulated cabinets. These cabinets require lead-out lines to connect the main transformer to the switchgear, and between switchgear units. When epoxy resin vacuum-impregnated paper solid-insulated tubular busbars are directly inserted into the gas-insulated switchgear's gas-filled chamber as lead-out lines, the busbar body needs to be bonded with flanges for fixation to the switchgear. However, these bonding points may leak air, failing to meet airtightness requirements. Since the epoxy resin vacuum-impregnated paper solid-insulated tubular busbars are part of the switchgear's gas chamber, they must be airtight to prevent leakage of insulating gas during operation, which could lead to decreased insulation capacity, insulation failure, and environmental pollution from gas leaks (such as SF6).

[0003] Current methods for testing airtightness involve transporting the product to the site, installing it, and inflating it before using a pressure gauge or gas detector to determine its airtightness. If the product is found to be airtight, it can be put into normal testing and operation. However, if a leak is detected, it cannot be handled on-site and must be returned to the factory for repair before being sent back for on-site testing. This requires repeated coordination and debugging from the relevant equipment manufacturers, severely impacting the construction schedule, delaying the power plant's commissioning, and causing significant losses to the customer. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides an airtight leak detection tool for gas-filled cabinet plugs, which can determine the airtightness of the product before it leaves the factory and make corresponding repairs, avoiding the need to return the product to the factory for repairs only after it has been transported to the site for installation, thus avoiding delays in transportation and increased costs.

[0005] To achieve the above objectives, the present invention provides a leak-proof testing fixture for a gas-insulated switchgear plug. The gas-insulated switchgear plug includes a busbar body, an adhesive flange bonded to the outside of the busbar body with adhesive, and a pressure ring fitted on the outside of the adhesive flange. It includes a tank, an adapter flange, an inflation / deflation pipe, and a pressure testing pipe. The tank has an internal air chamber, and an opening communicating with the air chamber is provided on one side of the tank. The opening has a connecting portion. The adapter flange is detachably fixed to the connecting portion. The central hole of the adapter flange provides a channel for the gas-insulated switchgear plug to extend into the air chamber. The adapter flange has multiple connecting holes along its circumference, which are used to connect with the pressure ring to detachably fix the adhesive flange to the adapter flange. The inflation / deflation pipe is connected to the tank and communicates with the air chamber. One end of the pressure testing pipe is connected to the tank and communicates with the air chamber, and the other end of the pressure testing pipe is equipped with a pressure testing device to detect the air pressure inside the air chamber.

[0006] Furthermore, the pressure measuring device is a safety valve with a pressure gauge, which releases gas to reduce pressure when the pressure exceeds the limit.

[0007] Furthermore, the inflation / deflation tube is a flexible tube.

[0008] Furthermore, the pressure measuring tube is a flexible tube.

[0009] Furthermore, the inflation / deflation pipe and the pressure measuring pipe are both located on the same side of the tank.

[0010] Furthermore, an annular groove is provided on the surface of the connecting part that contacts the adapter flange, and a sealing ring is provided inside the annular groove.

[0011] Furthermore, the connecting part is a connecting flange disposed on the outside of the opening, and the connecting flange is connected to the adapter flange by bolts and nuts.

[0012] Furthermore, an annular groove is formed on the surface of the connecting flange that contacts the adapter flange, and a sealing ring is provided inside the annular groove.

[0013] During use, connect the plug of the gas chamber to be tested to the fixture using bolts. After connection, place the product into the water tank, ensuring the area to be tested is submerged. Observe the pressure gauge as it pumps air into the specified pressure through the inflation port and lock the inflation / deflation hose. During this process, observe whether any bubbles emerge from the water tank and determine their nature. If the product is leaking air, immediately loosen the inflation / deflation hose until the pressure gauge reads 0. Remove the product and fixture from the water tank and loosen the bolts between the product and the fixture. If the product is not leaking air, after the specified time has elapsed, loosen the inflation / deflation hose again until the pressure gauge reads 0. Remove the product and fixture from the water tank and loosen the bolts between the product and the fixture to proceed to the next product test.

[0014] The advantages of this utility model are: the structure is relatively simple, the detection method is relatively safe, and the airtightness of the product can be determined before the product leaves the factory and corresponding repairs can be made. This avoids the situation where the product is transported to the site and installed, and the leak is detected, which would force the product to be returned to the factory for repair, thus avoiding the delay in transportation and the increase in costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the airtight leak detection tool for the gas-filled cabinet plug in one embodiment of the present invention;

[0016] Figure 2 This is a side view of the airtight leak detection fixture for the gas-filled cabinet plug in one embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of the gas-filled cabinet plug in one embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of the gas-tight leak detection tool for the gas-filled cabinet plug installed on an epoxy resin vacuum-impregnated paper solid insulation tubular busbar in one embodiment of the present invention.

[0019] Figure 5 for Figure 4 A partial enlarged view of the installation position of the vacuum-impregnated paper solid insulation tubular busbar and the gas-filled switchgear plug airtight leak detection tool.

[0020] Figure 6 This is a schematic diagram of the structure of the gas-tight leak detection tool for the gas-filled cabinet plug during use in one embodiment of the present invention;

[0021] In the diagram: 10. Gas-insulated switchgear plug; 11. Busbar body; 12. Adhesive flange; 13. Pressure ring; 14. Adhesive.

[0022] 100. Tank body; 110. Gas chamber; 120. Opening; 130. Connecting part; 131. Sealing ring.

[0023] 200. Fitting flange; 210. Connecting hole; 220. Bolt; 230. Nut; 240. Spring washer; 250. Flat washer.

[0024] 300. Inflation / depression hose.

[0025] 400. Pressure measuring tube; 410. Pressure measuring device. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0027] like Figure 3 As shown, the gas-insulated switchgear plug 10, namely the epoxy resin vacuum impregnated paper solid insulation tubular busbar, includes a busbar body 11, an adhesive flange 12 bonded to the outside of the busbar body 11 by adhesive 14, and a pressure ring 13 sleeved on the outside of the adhesive flange 12.

[0028] See Figure 1The diagram shows a structural schematic of a gas-insulated switchgear plug airtightness testing fixture, used for airtightness testing of the gas-insulated switchgear plug 10. It includes a tank 100, an adapter flange 200, an inflation / deflation pipe 300, and a pressure testing pipe 400. The tank 100 has an internal air chamber 110, and an opening 120 communicating with the air chamber 110 is provided on one side of the tank 100. The opening 120 has a connecting part 130. The adapter flange 200 is detachably fixed to the connecting part 130, and the central hole of the adapter flange 200 is used for the gas-insulated switchgear plug 10 to extend into the air chamber 110. The gas chamber 110 provides space for the installation of the gas filling cabinet plug 10. The adapter flange 200 has multiple connection holes 210 along the circumferential direction. The connection holes 210 are used to connect with the pressure ring 13 to detachably fix the adhesive flange 12 to the adapter flange 200. The gas filling and discharging pipe 300 is connected to the tank body 100 and communicates with the gas chamber 110. One end of the pressure measuring pipe 400 is connected to the tank body 100 and communicates with the gas chamber 110. The other end of the pressure measuring pipe 400 is provided with a pressure measuring device 410 to detect the gas pressure inside the gas chamber 110.

[0029] The aforementioned gas-tightness leak detection fixture for gas-filled cabinet plugs has a simple structure and a safe testing method. It can determine the airtightness of the product before it leaves the factory and make corresponding adjustments, avoiding the need to return the product to the factory for repairs only after it has been installed on-site, which would delay transportation time and increase costs.

[0030] In one embodiment, the pressure measuring device 410 is a safety valve with a pressure gauge to release air and reduce pressure when the air pressure exceeds the limit. This improves the safety of tooling use while enabling real-time monitoring of the internal pressure of the air chamber 110.

[0031] In one embodiment, the inflation / deflation pipe 300 is a flexible hose. The aforementioned gas cabinet plug leak detection fixture uses a flexible hose for the inflation / deflation pipe 300. This design facilitates locking during leak testing; the operator can lock the pipe by pinching it. In other embodiments, a valve can also be installed on the inflation / deflation pipe 300 to control its opening and closing. Furthermore, using a flexible hose for the inflation / deflation pipe 300 promotes miniaturization of the fixture, making it easier to store and use.

[0032] In one embodiment, the pressure measuring tube 400 is a flexible tube. Similarly, making the pressure measuring tube 400 a flexible tube facilitates the miniaturization of the tooling and makes it easier to store and use.

[0033] In one embodiment, the inflation / deflation pipe 300 and the pressure measuring pipe 400 are both located on the same side of the tank 100.

[0034] In one embodiment, an annular groove is provided on the surface of the connecting part 130 that contacts the adapter flange 200, and a sealing ring 131 is provided inside the annular groove.

[0035] In one embodiment, the connecting part 130 is a connecting flange disposed on the outside of the opening, and the connecting flange and the adapter flange 200 are connected by bolts 220 and nuts 230. For specific details, see [reference needed]. Figure 5 The connection position is also equipped with a spring washer 240 and a flat washer 250, making the connection more reliable.

[0036] In one embodiment, an annular groove is formed on the surface of the connecting flange that contacts the adapter flange 200, and a sealing ring 131 is disposed inside the annular groove. This arrangement enhances the sealing effect between the connecting flange and the adapter flange 200 while ensuring a reliable connection, and to a certain extent avoids the sealing performance test results being affected by poor sealing between the connecting flange and the adapter flange 200.

[0037] When using, please refer to Figure 4 , Figure 5 and Figure 6 Connect the product to be inspected, i.e., the gas chamber plug 10, to the fixture using bolts 220. After connection, place the product in the water tank, ensuring the inspected part is submerged. Observe the pressure gauge as it pumps air into the specified pressure through the inflation port and lock the inflation / deflation pipe 300. During this process, observe whether any bubbles emerge from the water tank and determine their nature. If the product is leaking air, immediately loosen the inflation / deflation pipe 300 until the pressure gauge reads 0. Remove the product and fixture from the water tank and loosen the bolts 220 between the product and the fixture. If the product is not leaking air, after the specified time has elapsed, loosen the inflation / deflation pipe 300 again until the pressure gauge reads 0. Remove the product and fixture from the water tank and loosen the bolts 220 between the product and the fixture to proceed to the next product inspection.

[0038] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intermediate element present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "above," "below," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

Claims

1. A gas-tight leak detection fixture for a gas-insulated switchgear plug, the gas-insulated switchgear plug comprising a busbar body, an adhesive flange bonded to the outside of the busbar body by an adhesive, and a pressure ring sleeved on the outside of the adhesive flange, characterized in that: include The tank body has an internal air chamber, and an opening communicating with the air chamber is provided on one side of the tank body. The opening is provided with a connecting part. The adapter flange is detachably fixed to the connecting part. The center hole of the adapter flange is used to provide a channel for the gas cabinet plug to extend into the gas chamber. The adapter flange has multiple connecting holes along the circumferential direction. The connecting holes are used to connect with the pressure ring to detachably fix the adhesive flange to the adapter flange. An inflation / deflation pipe is connected to the tank body and communicates with the air chamber; A pressure measuring tube is connected at one end to the tank body and communicates with the gas chamber. A pressure measuring device is provided at the other end of the pressure measuring tube to detect the gas pressure inside the gas chamber.

2. The gas-tight leak detection fixture for a gas-filled cabinet plug according to claim 1, characterized in that: The pressure measuring device is a safety valve with a pressure gauge, which releases gas to reduce pressure when the pressure exceeds the limit.

3. The gas-tight leak detection fixture for a gas-filled cabinet plug according to claim 1, characterized in that: The inflation / deflation tube is a flexible tube.

4. The gas-tight leak detection fixture for a gas-filled cabinet plug according to claim 1, characterized in that: The pressure measuring tube is a flexible tube.

5. The gas-tight leak detection fixture for a gas-filled cabinet plug according to claim 1, characterized in that: The inflation / deflation pipe and the pressure measuring pipe are both located on the same side of the tank.

6. A leak-proof testing fixture for a gas-insulated switchgear plug according to any one of claims 1-5, characterized in that: An annular groove is provided on the surface of the connecting part that contacts the adapter flange, and a sealing ring is provided inside the annular groove.

7. A leak-proof testing fixture for a gas-insulated switchgear plug according to any one of claims 1-5, characterized in that: The connecting part is a connecting flange located on the outside of the opening, and the connecting flange is connected to the adapter flange by bolts and nuts.

8. The gas-tight leak detection fixture for a gas-insulated switchgear plug according to claim 7, characterized in that: The surface of the connecting flange that contacts the adapter flange has an annular groove, and a sealing ring is provided inside the annular groove.

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