A high-current bushing conductor sealing test fixture

Abstract

This utility model provides a high-current bushing conductor sealing test fixture, belonging to the field of bushing testing equipment. It includes a test cylinder, a transition plate, a base plate, a fixture plate, a conductor, and a pressure monitoring and gas charging / discharging device. The test cylinder is connected to the transition plate on the upper side and the base plate on the lower side to form a closed cavity. The transition plate has a sealing groove and mounting holes, and a sealing ring is placed inside. The conductor is placed on the transition plate, and the fixture plate presses the conductor tightly with bolts. The vent hole at the top of the conductor is equipped with a sealing gasket and a vent plug. The pressure monitoring and gas charging / discharging device includes a pressure gauge, a charging valve, a switch, and a hose. This fixture is highly versatile and suitable for conductors of various specifications. Using gas as the medium, it is simple to operate, can quickly locate leak points, improves testing efficiency and safety, reduces costs, and ensures no leakage at the conductor welding surface.

Description

Technical Field

[0001] This utility model relates to the technical field of high-current bushing testing equipment, and in particular to a high-current bushing conductor sealing test fixture. Background Technology

[0002] During transformer operation, bushing seal problems can lead to transformer oil leakage, affecting normal equipment operation and even causing safety accidents, jeopardizing the stable power supply of the power system. Traditional high-current conductor bushing pressure testing fixtures are typically designed for specific sizes and structures, making them difficult to apply to high-current bushing conductors of different specifications. This results in a wide variety of pressure testing fixtures and high costs. Furthermore, using transformer oil pressure to test bushing sealing performance not only consumes a large amount of transformer oil and incurs high costs for testing equipment and maintenance, but also makes oil treatment and recovery quite cumbersome. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a high-current bushing conductor sealing test fixture, which solves the problems of poor fixture versatility, high cost, cumbersome operation, and troublesome test medium handling in existing technologies.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A high-current bushing conductor sealing test fixture includes a test cylinder, a transition plate, a base plate, a fixture plate, a conductor, and a pressure monitoring and gas charging / discharging device. The upper side of the test cylinder is connected to the transition plate, and the lower side is connected to the base plate to form an integral unit. The transition plate is provided with a sealing groove and a mounting hole, and a sealing ring is provided in the sealing groove. The conductor is placed on the transition plate, and the fixture plate presses on the upper end cap of the conductor and is connected to the transition plate by bolts to achieve compression. A sealing gasket and a vent plug are provided in the vent hole at the top of the conductor. The pressure monitoring and gas charging / discharging device includes a pressure gauge, a charging valve, a charging valve switch, and a charging hose. The pressure gauge and the charging valve are installed on the test cylinder, and the charging valve is provided with a charging valve switch and connected to the charging hose.

[0006] Furthermore, the test cylinder is provided with evenly distributed reinforcing ribs on its side.

[0007] Furthermore, the reinforcing rib is provided with holes for hoisting.

[0008] Furthermore, the bolts are evenly distributed circumferentially along the edge of the transition plate, with a quantity of 4-8.

[0009] Furthermore, the gas flow channel of the inflation valve is equipped with a one-way valve core, which only allows gas to flow unidirectionally from the inflation hose into the test cylinder. The inflation valve switch can force the one-way valve core to open to achieve bidirectional airflow.

[0010] Furthermore, the sealing ring is a ring-shaped structure with a rectangular cross-section, and its material is fluororubber with a Shore hardness of 70-80.

[0011] Furthermore, the height of the sealing ring is 1-2 mm greater than the depth of the sealing groove.

[0012] Furthermore, the sealing gasket is a metal-edged rubber structure, with the inner side of the metal edging fitting against the stepped surface of the vent plug, and the rubber part being interference-fitted with the inner wall of the vent hole.

[0013] Furthermore, the nominal pressure of the inflatable hose is not lower than the design test pressure of the test cylinder, and the hose is provided with a spiral metal protective sleeve on the outer layer.

[0014] Furthermore, the test cylinder, transition plate, and base plate are made of metal and are connected by welding.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. High versatility: By using bolts to tighten the tooling plate and the transition plate, there is no need to pass through the conductor. It can be used for conductors of various sizes, which solves the problem of poor versatility caused by traditional tooling being designed for specific sizes. It also reduces the number of tooling specifications and lowers costs.

[0017] 2. Simple operation: The overall structure is streamlined with fewer parts. The operation steps of each component are simple and do not require professional tools. Ordinary technicians can become proficient after simple training, which simplifies the test operation process and saves labor costs.

[0018] 3. High testing efficiency: From mechanical installation to sealing monitoring preparation, the operation is simplified and efficient, and the overall testing time is shortened compared with traditional tooling, which accelerates the quality inspection process and improves production and operation efficiency.

[0019] 4. High safety: Using gas as the test medium avoids the leakage risk and environmental problems caused by using transformer oil, and can effectively detect gas leakage, thus avoiding safety accidents caused by medium leakage.

[0020] 5. Low maintenance cost: The reasonable structural design makes it easy to install and disassemble, reducing the preparation time before the test and the cleaning work after the test. At the same time, the maintenance cost of the tooling is also low, which is conducive to long-term use. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is a schematic diagram of the test cylinder structure of an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the tooling plate structure in an embodiment of the present utility model;

[0024] Figure 3 This is a schematic diagram of the sealing test structure of an embodiment of this utility model.

[0025] In the above attached figures: 1. Weld joint of welding plate; 2. Sealing ring; 3. Pressure gauge; 4. Test cylinder; 5. Gas; 6. Inflation valve; 7. Inflation valve switch; 8. Inflation hose; 9. Base plate; 10. Conductor; 11. Reinforcing rib; 12. Bolt; 13. Transition plate; 14. Tooling plate; 15. Sealing gasket; 16. Vent plug. Detailed Implementation

[0026] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0027] like Figure 1 , Figure 3 As shown, a high-current bushing conductor sealing test fixture includes a test cylinder 4, a transition plate 13, a base plate 9, a fixture plate 14, a conductor 10, and a pressure monitoring and gas charging / discharging device.

[0028] The test cylinder 4 is welded from carbon steel with a thickness of 10-20mm. Its diameter is designed to be 500-1000mm according to the size of common conductors 10, and its height is 800-1500mm. A transition plate 13 is welded to the upper side of the test cylinder 4. The transition plate 13 is a steel plate with a thickness of 20-30mm. It has a sealing groove and mounting holes machined on it. The cross-sectional size of the sealing groove is 10mm×10mm, which is used to place the sealing ring 2. A bottom plate 9 with a thickness of 15-25mm is welded to the lower side, forming a closed integral structure with the test cylinder 4.

[0029] A sealing ring 2 is placed in the sealing groove on the transition plate 13. The sealing ring 2 is a 10mm diameter nitrile rubber O-ring, which has good oil resistance and wear resistance and meets the test pressure requirements.

[0030] Conductor 10 is placed on transition plate 13, and tooling plate 14 is pressed on the upper end cap of conductor 10. Tooling plate 14 is a steel plate with a thickness of 15-25mm. It is connected to transition plate 13 by bolts 12. Bolts 12 are high-strength bolts of M16-M20, and there are 4-8 bolts. They are evenly distributed at the mounting holes of transition plate 13. The tightening torque is controlled at 300-500N·m to provide sufficient clamping force.

[0031] A sealing gasket 15 is placed in the vent hole at the top of the conductor 10. The sealing gasket 15 is an oil-resistant rubber gasket with a thickness of 5mm and its size matches the vent hole. Then, the vent plug 16 is tightened. The vent plug 16 is an M20-M30 metal bolt with a sealing structure at the end.

[0032] The pressure monitoring and gas charging / discharging device includes a pressure gauge 3, a charging valve 6, a charging valve switch 7, and a charging hose 8. The pressure gauge 3 is a shock-resistant pressure gauge with a range of 0-1.6 MPa and an accuracy class of 1.6. It is installed on the side of the test cylinder 4 for easy observation by the operator. The charging valve 6 is a brass ball valve with a nominal diameter of DN15-DN25. It is equipped with the charging valve switch 7 to control the charging and discharging of gas. The charging valve 6 is connected to the charging hose 8 via a threaded connection. The charging hose 8 is a rubber hose with a pressure resistance of 1.6 MPa or higher, a length of 2-5 m, and the other end can be connected to a gas source.

[0033] The test cylinder has uniformly distributed reinforcing ribs 11 welded on its four sides. The reinforcing ribs 11 are angle steel with a cross-sectional size of 100mm×100mm, and there are 4-6 of them. They are provided with lifting holes with a diameter of 20-30mm for lifting and transporting the tooling.

[0034] During the sealing test, first place the sealing ring 2 into the sealing groove at the top of the transition plate 13, place the conductor 10 on the transition plate 13, press the tooling plate 14 onto the upper end cap of the conductor 10, and tighten it with bolts 12; place the sealing gasket 15 into the vent hole at the top of the conductor 10 and tighten the vent plug 16; evenly apply soapy water to the weld seam 1 of the dotted welding plate; use the inflation valve 6 to fill the test cylinder 4 with an appropriate amount of gas 5 through the inflation hose 8, the gas 5 being 0.4-0.6MPa compressed air; observe the pressure change inside the test cylinder 4 through the pressure gauge 3. If the pressure value remains stable for several hours and no bubbles are generated from the soapy water applied to the weld seam 1 of the welding plate, it indicates that the sealing performance is good; if the pressure drops or bubbles are generated at the weld seam, there is a leakage problem.

[0035] After the test, open the inflation valve 6 through the inflation valve switch 7 to completely release the gas in the test cylinder 4, then loosen the bolt 12, remove the tooling plate 14 and conductor 10, and the test is complete.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A large current bushing conductor seal test fixture characterized by, The test cylinder includes a test cylinder (4), a transition plate (13), a base plate (9), a tooling plate (14), a conductor (10), and a pressure monitoring and gas charging / discharging device. The upper side of the test cylinder (4) is connected to the transition plate (13), and the lower side is connected to the base plate (9) to form a whole. The transition plate (13) is provided with a sealing groove and a mounting hole, and a sealing ring (2) is provided in the sealing groove. The conductor (10) is placed on the transition plate (13), and the tooling plate (14) presses on the upper end cap of the conductor (10). And is connected to the transition plate (13) by bolts (12) to achieve compression; the top vent hole of the conductor (10) is provided with a sealing gasket (15) and a vent plug (16); the pressure monitoring and gas charging and discharging device includes a pressure gauge (3), a charging valve (6), a charging valve switch (7) and a charging hose (8). The pressure gauge (3) and the charging valve (6) are installed on the test cylinder (4). The charging valve (6) is provided with a charging valve switch (7) and is connected to the charging hose (8).

2. A high current bushing conductor seal test fixture as recited in claim 1 wherein, The test cylinder (4) has evenly distributed reinforcing ribs (11) on its side.

3. A high current bushing conductor seal test fixture as recited in claim 2 wherein, The reinforcing rib (11) is provided with holes for hoisting.

4. A high current bushing conductor seal test fixture as recited in claim 1 wherein, The bolts (12) are evenly distributed circumferentially along the edge of the transition plate (13), and the number is 4-8.

5. A high current bushing conductor seal test fixture as recited in claim 1 wherein, The gas flow channel of the inflation valve (6) is provided with a one-way valve core. The one-way valve core only allows gas to flow unidirectionally from the inflation hose (8) to the test cylinder (4). The inflation valve switch (7) can force the one-way valve core to open to achieve bidirectional airflow.

6. A high current bushing conductor seal test fixture as recited in claim 1 wherein, The sealing ring (2) is a ring structure with a rectangular cross section, and its material is fluororubber with a Shore hardness of 70-80.

7. A high current bushing conductor seal test kit as claimed in claim 6, wherein, The height of the sealing ring (2) is 1-2 mm greater than the depth of the sealing groove.

8. A high current bushing conductor seal test fixture as recited in claim 1 wherein, The sealing gasket (15) is a metal-edged rubber structure. The inner side of the metal edge is in contact with the stepped surface of the vent plug (16), and the rubber part is in interference fit with the inner wall of the vent hole.

9. A high current bushing conductor seal test fixture as recited in claim 1 wherein, The nominal pressure of the air-filled hose (8) is not lower than the design test pressure of the test cylinder (4), and the outer layer of the hose is provided with a spiral metal protective sleeve.

10. A high current bushing conductor seal test fixture as recited in claim 1 wherein, The test cylinder (4), transition plate (13) and bottom plate (9) are made of metal and are connected by welding.

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