Online oil storage and purification device for oil-immersed transformer

Abstract

The utility model belongs to the field of auxiliary equipment of oil-immersed transformers, and discloses an on-line oil storage and purification device of an oil-immersed transformer, which comprises an oil storage shell, an oil inlet and an oil outlet, a carrier ring; a plurality of suspension support rods; a fixed frame; the attachment pipes are obliquely arranged in the oil storage shell and located in an inner cavity of the fixing frame, the attachment pipes are welded to one another, and the attachment pipes on the outermost ring are welded to the inner wall of the fixing frame; the attachment pipes are used for enabling oil sludge and fiber impurities in the insulating oil entering the oil storage shell from the oil inlet pipe to be attached to the inner walls of the attachment pipes; the filtering and defoaming mechanism is positioned above each attachment pipe and is used for eliminating and filtering bubbles and suspended matters in the insulating oil passing through the attachment pipes; on the premise of not influencing normal work of the oil-immersed transformer, not interrupting power supply and not changing operation conditions of equipment, oil sludge, fiber impurities and bubbles in insulating oil are removed, aging of the insulating oil is delayed, and the service life of the oil-immersed transformer is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of auxiliary equipment for oil-immersed transformers, and particularly relates to an online oil storage and purification device for oil-immersed transformers. Background Technology

[0002] During the storage, transportation, and installation of oil-immersed transformers, inadequate protection can lead to dust, impurities, rust, fibers, and other contaminants remaining inside the transformer. Consequently, the insulating oil in oil-immersed transformers contains many fibers among its solid impurities, and the presence of dust can also generate sludge.

[0003] Existing technologies require the oil-immersed transformer to be shut down, de-energized, and in a non-operating state before filtering and purifying the insulating oil can be carried out; they cannot perform online filtering and purification of the insulating oil. Furthermore, existing technologies lack de-bubbling capabilities; insulating oil is highly susceptible to generating microbubbles during circulation, filtration, and temperature changes, which cannot be effectively removed during flow.

[0004] Fibers, sludge, and air bubbles can significantly reduce the breakdown voltage and insulation strength of insulating oil, exacerbate partial discharge, and affect the heat dissipation efficiency of the oil. Long-term operation can damage the insulation performance of transformer windings, cores, and other components, shorten the service life of the transformer, and even cause safety accidents such as insulation breakdown and short circuits. Utility Model Content

[0005] The purpose of this invention is to provide an online oil storage and purification device for oil-immersed transformers to solve the problem that existing technologies cannot filter and purify fibers, sludge, and air bubbles in insulating oil online.

[0006] This utility model adopts the following technical solution: an online oil storage and purification device for oil-immersed transformers, comprising:

[0007] The oil storage shell is vertically arranged and is a cylindrical structure with an open top. Its lower end is conical and has a slag outlet. Its upper end is fixedly connected to a flange end cap. The lower end of the oil storage shell is connected to the oil outlet of the oil-immersed transformer tank through an oil inlet pipe. The upper half of the oil storage shell is connected to the oil inlet of the oil-immersed transformer tank through an oil outlet pipe.

[0008] The bearing ring is a ring-shaped structure located between the oil storage shell and the flange end cover, with its lower side resting on the upper opening of the oil storage shell;

[0009] Multiple L-shaped suspension support rods are vertically installed inside the oil storage shell. Each suspension support rod includes a vertical section and a horizontal section. The upper end of the vertical section of the suspension support rod is fixedly connected to the lower side of the bearing ring, and the horizontal section of the suspension support rod extends towards the center of the oil storage shell.

[0010] The fixed frame is a frame structure located inside the oil storage shell, and its outer wall is fixedly connected to the end of the horizontal section of each suspension support rod.

[0011] Multiple attachment tubes are inclinedly arranged inside the oil storage shell and gathered in the inner cavity of the fixed frame. The attachment tubes are welded to each other, and the outermost attachment tubes are welded to the inner wall of the fixed frame. Each attachment tube is used to prevent sludge and fibrous impurities in the insulating oil entering the oil storage shell from the oil inlet pipe from adhering to the inner wall of the attachment tube.

[0012] The filtration and defoaming mechanism is located inside the oil storage shell and above each attachment pipe. It is used to eliminate and filter air bubbles and suspended matter in the insulating oil passing through the attachment pipe. This allows the insulating oil entering the oil storage shell from the oil inlet pipe to be recycled back into the oil-immersed transformer tank through the oil outlet pipe after sequentially undergoing attachment, filtration and defoaming, thus completing the online purification of the insulating oil.

[0013] The beneficial effects of this utility model are:

[0014] This invention uses an inclined attachment pipe to allow sludge and fibrous impurities to adhere to the inner wall of the attachment pipe as the insulating oil rises. This effectively removes deteriorated impurities from the insulating oil, improves its insulation performance and heat dissipation efficiency, and ensures the long-term stable operation of the transformer.

[0015] This utility model filters and defoams suspended matter and air bubbles in the insulating oil passing through the attachment tube by setting a filter plate and a defoaming plate.

[0016] This utility model, by setting a flexible bladder on the lower side of the flange end cover, can effectively prevent the insulating oil in the oil storage shell from rising to near the flange end cover and entering the silicone breather valve and escaping. At the same time, it can assist the air pressure balance of the silicone breather valve and also take into account the moisture-proof function.

[0017] The bearing ring, suspension support rod, fixing frame, attachment pipe and filter defoaming mechanism of this utility model are connected as one unit. When cleaning is required, only the flange end cover needs to be removed to take out all the integrated components from the oil storage shell. The components do not need to be disassembled one by one, which greatly simplifies the disassembly process, makes it easier for staff to complete the cleaning operation quickly, further reduces the maintenance difficulty and labor intensity, and avoids damage to each component during the disassembly process.

[0018] This invention removes sludge, fibrous impurities, and air bubbles from the insulating oil without affecting the normal operation of the oil-immersed transformer, without interrupting power supply, and without changing the operating conditions of the equipment, thereby delaying the aging of the insulating oil and extending the service life of the oil-immersed transformer. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0021] The components are: 10. Suspension support rod; 11. Oil inlet pipe; 12. Attachment pipe; 13. Oil outlet pipe; 14. Filter disc; 15. Defoaming disc; 16. Silicone breather valve; 17. Flange end cap; 18. Flexible bladder; 19. Fixed column; 20. Oil storage shell; 21. Slag outlet; 22. Fixed frame; 23. Bearing ring. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. In this invention, "direction" refers to the orientation of the present invention. Figure 1 Description of the state's progression.

[0023] This utility model discloses an online oil storage and purification device for oil-immersed transformers, such as... Figure 1 and Figure 2 As shown, it includes an oil storage shell 20, a bearing ring 23, multiple suspension support rods 10, a fixing frame 22, multiple attachment pipes 12, and a filtration and defoaming mechanism.

[0024] The oil storage shell 20 is vertically arranged and is a cylindrical structure with an open top. The lower end of the oil storage shell 20 is conical and has a slag outlet 21, which is equipped with a sealing valve. A flange end cap 17 is fixedly connected to the upper end of the oil storage shell 20. The lower end of the oil storage shell 20 is connected to the oil outlet of the oil-immersed transformer tank through an oil inlet pipe 11. The upper half of the oil storage shell 20 is connected to the oil inlet of the oil-immersed transformer tank through an oil outlet pipe 13.

[0025] Preferably, the oil storage shell 20 is made of stainless steel. The upper end of the oil storage shell 20 is fixedly connected to the flange end cover 17 by bolts. A sealing gasket is provided at the connection between the flange end cover 17 and the oil storage shell 20 to ensure the sealing of the oil storage shell 20.

[0026] The bearing ring 23 is a ring structure and is made of the same stainless steel as the oil storage shell 20. The bearing ring 23 is located between the oil storage shell 20 and the flange end cover 17. The lower side of the bearing ring 23 rests on the upper opening of the oil storage shell 20. The flange end cover 17 is tightened with bolts to ensure the stability of the bearing ring 23.

[0027] Multiple suspension support rods 10 are L-shaped and made of stainless steel round rods. The multiple suspension support rods 10 are vertically arranged inside the oil storage shell 20. Each suspension support rod 10 includes a vertical section and a horizontal section. The upper end of the vertical section of each suspension support rod 10 is fixedly connected to the lower side of the bearing ring 23 by welding. The horizontal section of the suspension support rod 10 extends towards the center of the oil storage shell 20. Preferably, there are 4 suspension support rods 10, which are evenly distributed on the lower side of the bearing ring 23 to ensure bearing stability.

[0028] The fixed frame 22 is a frame structure. The size of the fixed frame 22 matches the contour formed by the bending of the suspension support rod 10. The outer wall of the fixed frame 22 is fixedly connected to the end of the horizontal section of each suspension support rod 10 by welding.

[0029] Multiple attachment tubes 12 are made of copper tubes and are inclinedly arranged inside the oil storage shell 20 and gathered in the inner cavity of the fixed frame 22. The attachment tubes 12 are welded to each other, and the outermost attachment tubes 12 are welded to the inner wall of the fixed frame 22. The inclination angle of the attachment tubes 12 is 20°-30°. This angle can ensure that the insulating oil rises smoothly and that impurities adhere to the inner wall of the attachment tubes 12.

[0030] By setting multiple attachment pipes 12, sludge and fibrous impurities in the insulating oil can be attached to the inner wall of the attachment pipe 12. As the insulating oil rises, it climbs along the inner wall of the attachment pipe 12, causing the sludge and fibrous impurities to adhere to the inner wall of the attachment pipe 12. If larger particulate impurities are encountered, these particulate impurities will automatically fall to the bottom of the oil storage shell 20 due to gravity and be discharged from the oil storage shell 20 through the slag outlet 21.

[0031] The filtration and defoaming mechanism is located inside the oil storage shell 20 and above each attachment pipe 12. The filtration and defoaming mechanism is used to eliminate and filter the air bubbles and suspended matter in the insulating oil passing through the attachment pipe 12, so that the insulating oil entering the oil storage shell 20 from the oil inlet pipe 11 can be recycled back into the oil-immersed transformer tank through the oil outlet pipe 13 after sequentially passing through attachment, filtration and defoaming, thus completing the online purification of the insulating oil.

[0032] The filtration and defoaming mechanism includes a filter disc 14, a defoaming disc 15, and a fixed column 19. Both the filter disc 14 and the defoaming disc 15 are made of stainless steel and are umbrella-shaped structures with downward openings. The filter disc 14 has multiple vertically penetrating filter holes. The defoaming disc 15 is located inside the oil storage shell 20 and above the filter disc 14. The defoaming disc 15 has multiple vertically penetrating defoaming holes. The diameter of each defoaming hole is smaller than the diameter of each filter hole. The diameter of the filter holes is preferably 81-100 μm, and the diameter of the defoaming holes is preferably 60-80 μm.

[0033] The fixed column 19 is a stainless steel round rod. The fixed column 19 is vertically set between the filter plate 14 and the defoaming plate 15. The upper end of the fixed column 19 is fixedly connected to the center position of the defoaming plate 15 by welding, and the lower end of the fixed column 19 is fixedly connected to the center position of the filter plate 14 by welding, thus fixing the filter plate 14 and the defoaming plate 15 into a whole.

[0034] The edge of the filter disc 14 is connected to each of the suspension support rods 10 by welding, so that the filter disc 14 is above the attachment tube 12. Preferably, the vertical distance between the center of the filter disc 14 and the upper end of the attachment tube 12 is 15-20cm.

[0035] The edge of the defoaming plate 15 is also connected to each of the suspension support rods 10 by welding. The defoaming plate 15 is located above the filter plate 14. Preferably, the vertical distance between the center of the defoaming plate 15 and the center of the filter plate 14 is 15-20cm.

[0036] The filter disc 14 is used to filter suspended matter in the insulating oil passing through the attachment pipe 12, and the defoaming disc 15 is used to filter out air bubbles in the insulating oil passing through the filter disc 14.

[0037] A silicone breather valve 16 is installed on the flange end cover 17 via a threaded connection. The silicone breather valve 16 is a conventional product used to balance the air pressure inside and outside the oil storage shell 20. A flexible bladder 18 is provided on the lower side of the flange end cover 17. The flexible bladder 18 is made of oil-resistant rubber and is circular. The edge of the flexible bladder 18 is fixedly connected to the lower side of the flange end cover 17, so that the center of the flexible bladder 18 hangs down naturally and downwards into the inner cavity of the oil storage shell 20. When the level of insulating oil in the oil storage shell 20 rises, the center of the flexible bladder 18 will move upward under the buoyancy of the insulating oil, blocking the connection between the silicone breather valve 16 and the inner cavity of the oil storage shell 20, preventing the insulating oil from entering the silicone breather valve 16.

[0038] The filter plate 14, defoaming plate 15, and attachment pipe 12 are all located in the lower half of the inner cavity of the oil storage shell 20. The upper half of the inner cavity of the oil storage shell 20 is the storage area for purified insulating oil, ensuring that the insulating oil has reached the purification standard when it rises to the oil outlet pipe 13.

[0039] The bearing ring 23, suspension support rod 10, fixing frame 22, filter disc 14, and defoaming disc 15 adopt an integrated connection structure, specifically forming a complete assembly through welding. This assembly is fixed inside the oil storage shell 20 by the clamping action of the bearing ring 23 and the flange end cover 17. When cleaning and maintenance of the attachment pipe 12, filter disc 14, and defoaming disc 15 are required, only the flange end cover 17 needs to be removed to take the entire assembly out of the oil storage shell 20. Components do not need to be disassembled one by one, greatly simplifying the disassembly process and facilitating quick cleaning operations. Preferably, an exhaust port is provided on the oil storage shell 20 near the oil outlet pipe 13, and an exhaust valve is installed at the exhaust port.

[0040] The working process of this utility model is as follows:

[0041] When the load or temperature changes in an oil-immersed transformer cause the insulating oil in the transformer tank to expand, the excess insulating oil enters the oil storage shell 20 through the oil inlet pipe 11. The insulating oil continuously accumulates in the oil storage shell 20. As the oil level rises, the insulating oil enters the attachment pipe 12 from its lower end. Due to the design of the attachment pipe 12, the contact area between the insulating oil and the inner wall of the attachment pipe 12 increases exponentially, causing sludge and fibrous impurities in the insulating oil to adhere to the inner wall of the attachment pipe 12. When the insulating oil passes through the filter disc 14, it passes through the filter holes on the filter disc 14, thus filtering out suspended matter in the insulating oil. When the insulating oil passes through the defoaming disc 15, it passes through the defoaming holes on the defoaming disc 15, thus dividing the insulating oil into countless fine oil streams and filtering out air bubbles. Finally, the insulating oil enters the oil-immersed transformer through the oil outlet pipe 13 of the oil storage shell 20 for reuse, completing the online purification of the insulating oil.

[0042] During operation, the silicone breather valve 16 balances the air pressure inside and outside the oil storage shell 20. When the level of insulating oil in the oil storage shell 20 rises due to temperature increase or circulation fluctuation, the center of the flexible bladder 18 moves upward under the buoyancy of the insulating oil, blocking the connection between the silicone breather valve 16 and the inner cavity of the oil storage shell 20, thus preventing the insulating oil from entering the silicone breather valve 16 and escaping.

[0043] In addition, in extreme cases, when the flexible bladder 18 is damaged, the silicone breather valve 16 will absorb the moisture in the air that enters the oil storage shell 20 from the outside. The use of the silicone breather valve ensures that the moisture content of the insulating oil in the oil storage shell 20 meets the requirements.

[0044] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An online oil storage and purification device for oil-immersed transformers, characterized in that, include: The oil storage shell (20) is vertically arranged and is a cylindrical structure with an open top. Its lower end is conical and has a slag outlet (21). Its upper end is fixedly connected to a flange end cap (17). The lower end of the oil storage shell (20) is connected to the oil outlet of the oil-immersed transformer tank through an oil inlet pipe (11). The upper half of the oil storage shell (20) is connected to the oil inlet of the oil-immersed transformer tank through an oil outlet pipe (13). The bearing ring (23) is a ring-shaped structure located between the oil storage shell (20) and the flange end cap (17), with its lower side resting on the upper opening of the oil storage shell (20); Multiple suspension support rods (10) are L-shaped and vertically arranged inside the oil storage shell (20). Each suspension support rod (10) includes a vertical section and a horizontal section. The upper end of the vertical section of the suspension support rod (10) is fixedly connected to the lower side of the bearing ring (23), and the horizontal section of the suspension support rod (10) extends toward the center of the oil storage shell (20). The fixed frame (22) is a frame structure located in the inner cavity of the oil storage shell (20), and its outer wall is fixedly connected to the end of the horizontal section of each of the suspension support rods (10); Multiple attachment tubes (12) are inclinedly arranged inside the oil storage shell (20) and gathered in the inner cavity of the fixed frame (22). The attachment tubes (12) are welded to each other, and the outermost attachment tubes (12) are welded to the inner wall of the fixed frame (22). Each attachment tube (12) is used to allow sludge and fiber impurities in the insulating oil entering the oil storage shell (20) from the oil inlet pipe (11) to adhere to the inner wall of the attachment tube (12). The filtration and defoaming mechanism is located inside the oil storage shell (20) and above each attachment pipe (12). It is used to eliminate and filter the air bubbles and suspended matter in the insulating oil passing through the attachment pipe (12), so that the insulating oil entering the oil storage shell (20) from the oil inlet pipe (11) can be recycled back into the oil-immersed transformer tank through the oil outlet pipe (13) after sequentially passing through attachment, filtration and defoaming, thus completing the online purification of the insulating oil.

2. The online oil storage and purification device for an oil-immersed transformer according to claim 1, characterized in that, The filtration and defoaming mechanism includes: The filter disc (14) is located inside the oil storage shell (20); it is an umbrella-shaped structure with an opening facing downwards, and multiple filter holes are vertically opened through it; The defoaming plate (15) is located inside the oil storage shell (20) and above the filter plate (14); it is an umbrella-shaped structure with an opening facing downwards, and multiple defoaming holes are vertically opened through it; the diameter of each defoaming hole is smaller than the diameter of each filter hole. A fixed column (19) is set vertically between the filter plate (14) and the defoaming plate (15). Its upper end is fixedly connected to the center of the defoaming plate (15), and its lower end is fixedly connected to the center of the filter plate (14). The edges of the filter disc (14) are welded to each of the suspension support rods (10), so that the filter disc (14) is above the attachment pipe (12) and filters the suspended matter in the insulating oil passing through the attachment pipe (12). The edges of the defoaming disc (15) are welded to each of the suspension support rods (10), so that the defoaming disc (15) is above the filter disc (14) and filters out the air bubbles in the insulating oil passing through the filter disc (14).

3. The online oil storage and purification device for an oil-immersed transformer according to claim 1 or 2, characterized in that, A silicone breather valve (16) is installed on the flange end cap (17). A flexible bladder (18) is provided on the lower side of the flange end cap (17). The flexible bladder (18) is in the shape of a disc. The edges of the flexible bladder (18) are fixedly connected to the lower side of the flange end cap (17), so that the center of the flexible bladder (18) hangs down naturally and descends into the inner cavity of the oil storage shell (20). The flexible bladder (18) is used to prevent the insulating oil in the oil storage shell (20) from rising to near the flange end cap (17) and entering the silicone breather valve (16) and escaping.

4. The online oil storage and purification device for an oil-immersed transformer according to claim 2, characterized in that, The filter disc (14), defoaming disc (15), and attachment pipe (12) are all located in the lower half of the inner cavity of the oil storage shell (20).

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