Anti-clogging oil-immersed transformer

Abstract

This utility model discloses an anti-clogging oil-immersed transformer. The transformer includes an oil tank with several heat exchange tubes arranged in an array on both sides. A filter assembly is located at the inlet of each heat exchange tube above the tank. The filter assembly includes a first tube body and a second tube body. The first tube body has a first oil inlet channel, and at least one second oil inlet channel is evenly distributed around its central point. The filter assembly at the heat exchange tube inlet effectively blocks aging impurities in the insulating oil, ensuring cleanliness inside the tube, preventing clogging, and ensuring efficient oil circulation and heat exchange. Its multi-layered, staggered filter structure guides uniform oil flow, reduces resistance, and possesses corrosion resistance and high-temperature resistance. Multiple oil inlet channels increase flow rate without changing the tube diameter. This design achieves a comprehensive effect of preventing clogging, maintaining efficiency, improving heat dissipation, and ensuring stable operation, providing an effective solution to technical problems.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to an anti-clogging oil-immersed transformer. Background Technology

[0002] The casing of an oil-immersed transformer contains insulating oil to absorb the heat generated during operation. This heat is then transferred to the heat sink on the casing for dissipation. The oil conservator in an oil-immersed transformer regulates the oil level in the transformer tank, ensuring the transformer remains fully filled with oil under all temperature and operating conditions. When the transformer oil temperature rises, the oil expands, and excess oil flows into the conservator; conversely, when the oil temperature drops, the oil shrinks, and the oil in the conservator flows back into the tank, thus automatically adjusting the oil level.

[0003] According to the authorized publication number CN118711956B, "An Oil-Immersed Transformer for Easy Temperature Regulation," a transformer is disclosed that includes an oil tank, an iron core, windings, heat dissipation pipes, an impeller, an adjustment assembly, guide vanes, a diversion assembly, and a diversion plate. The heat dissipation pipes are arrayed on the oil tank, and are divided into fixed heat dissipation pipes and swinging heat dissipation pipes. The impeller is located inside the oil tank and is rotatably mounted with the oil tank. An adjustment assembly is located below the impeller, and guide vanes are located in front of the adjustment assembly. When the temperature inside the oil tank rises, the fixed heat dissipation pipes drive the impeller to rotate through the oil, and the impeller drives the guide vanes and swinging heat dissipation pipes to swing left and right through the adjustment assembly. Diversion assemblies are located on both sides of the adjustment assembly, and a diversion plate is located at the top of the oil tank. When the guide vanes swing left and right, the adjustment assembly pushes the diversion plate to slide horizontally through the diversion assembly. This invention achieves uniform distribution of oil inside the oil tank through reciprocating motion, thereby improving heat dissipation efficiency and ensuring the uniformity of the horizontal temperature inside the oil tank.

[0004] The aforementioned technical solutions have the following drawbacks: During long-term operation, the insulating oil ages and decomposes, producing solid impurities such as fibers, carbon compounds, and metal particles. These impurities easily deposit on the inner wall of the heat dissipation pipes, forming physical blockages. Simultaneously, the sludge and moisture produced during aging react with the impurities to form a gel-like substance that adheres to the pipe wall, further exacerbating the blockage. This blockage inside the heat dissipation pipes significantly reduces the oil circulation efficiency and the heat exchange capacity of the heat dissipation pipes, ultimately leading to a decline in the overall heat dissipation performance of the transformer, affecting its safe and stable operation and service life. Therefore, this application proposes a new solution to the technical problem of heat dissipation pipe blockage and reduced heat dissipation efficiency caused by insulating oil aging in the prior art. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the above-mentioned technical solutions and provide a product that avoids blockages and operates stably.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A clog-resistant oil-immersed transformer includes an oil tank. Several heat exchange tubes are arranged in an array on both sides of the oil tank. A filter assembly is provided at the inlet of each heat exchange tube located above the oil tank. The filter assembly includes a first tube body and a second tube body. The first tube body has a first oil inlet channel. At least one second oil inlet channel is evenly distributed around the first oil inlet channel with its center point as the axis. The second tube body is threadedly connected to the first and second oil inlet channels. Multiple stacked and staggered first filter screens are provided at the inlet of the second tube body, and a second filter screen is provided at the outlet of the second tube body.

[0008] Preferably, the oil tank has oil holes on both sides for heat exchange tubes to pass through, a settling groove is provided at the inlet of the oil hole, and sealing sleeves are provided at both ends of the settling groove and the inlet of the heat exchange tubes, with O-rings on the inner wall of the sealing sleeves.

[0009] Preferably, the heat exchange tube is provided with a flange and is connected and fixed to the oil tank by screws, and the outer wall of the heat exchange tube is provided with a number of equally spaced heat dissipation fins.

[0010] Preferably, the outlet of the heat exchange tube is provided with a threaded connection to a third tube body, the third tube body is provided with an outwardly expanding oil outlet, and the end face of the oil outlet is provided with a plurality of equally spaced and inclined oil outlet holes evenly distributed around its axis.

[0011] Preferably, the first tube body is provided with a nut portion, the nut portion is provided with a connecting portion, and is threadedly connected to the heat exchange tube.

[0012] Preferably, the inlet of the second tube is provided with a first recessed hole for accommodating the first filter screen, and the outlet of the second tube is provided with a second recessed hole for accommodating the second filter screen.

[0013] Preferably, the first filter screen is a porous metal plate, and the second filter screen is a metal fiber mesh.

[0014] Beneficial effects:

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This invention, by installing a filter assembly at the inlet of the heat exchange tube, effectively blocks solid impurities such as fibers, carbon compounds, and metal particles generated by the aging and decomposition of insulating oil from entering the interior of the heat exchange tube. This not only ensures the cleanliness of the inner wall of the heat exchange tube, avoiding the adhesion of gel-like substances and potential physical blockage, but also provides a reliable guarantee for the smooth circulation of oil and efficient heat exchange within the tube. Furthermore, the first filter screen adopts a multi-layered, staggered filter structure, which not only helps guide the insulating oil to pass through evenly and reduces local flow resistance, but also ensures excellent corrosion resistance and high-temperature resistance, adapting to the harsh working environment of oil-immersed transformers. By setting multiple oil inlet channels, this design significantly increases the flow rate of insulating oil entering the heat exchange tube while maintaining the original diameter of the heat exchange tube, and maintains good oil flow capacity even after the filter assembly is installed. In summary, this design, through the above innovative structure, achieves the technical effects of effectively avoiding blockage, ensuring oil circulation efficiency, improving heat dissipation performance, and ensuring stable equipment operation, providing a beneficial solution to existing technical problems. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an anti-clogging oil-immersed transformer according to the present invention;

[0018] Figure 2 This is a side cross-sectional view of an anti-clogging oil-immersed transformer according to the present invention.

[0019] Figure 3 This utility model Figure 2 A magnified view of part A of an anti-clogging oil-immersed transformer;

[0020] Figure 4 This utility model Figure 2 A magnified view of part B of an anti-clogging oil-immersed transformer;

[0021] Figure 5 This is an exploded view of an anti-clogging oil-immersed transformer according to the present invention.

[0022] The correspondence between the labels and component names in the attached figures is as follows:

[0023] Reference numerals: 1. Oil tank; 2. Heat exchange tube; 3. Filter assembly; 4. First tube body; 5. Second tube body; 6. First filter screen; 7. Second filter screen; 8. O-ring seal; 9. Sealing sleeve; 11. Oil hole; 12. Countersunk groove; 21. Flange; 22. Heat dissipation fins; 23. Third tube body; 231. Oil outlet; 232. Oil outlet hole; 41. First oil inlet channel; 42. Second oil inlet channel; 43. Nut part; 44. Connecting part; 51. First countersunk hole; 52. Second countersunk hole. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0027] Reference example Figures 1 to 5 A clog-resistant oil-immersed transformer includes an oil tank 1. Several heat exchange tubes 2 are arranged in an array on both sides of the oil tank 1. A filter assembly 3 is provided at the inlet of the heat exchange tubes 2 located above the oil tank 1. The filter assembly 3 includes a first tube body 4 and a second tube body 5. The first tube body 4 is provided with a first oil inlet channel 41. At least one second oil inlet channel 42 is evenly distributed around the first oil inlet channel 41 with its center point as the axis. The second tube body 5 is threaded to the first oil inlet channel 41 and the second oil inlet channel 42. Multiple stacked and staggered first filter screens 6 are provided at the inlet of the second tube body 5. A second filter screen 7 is provided at the outlet of the second tube body 5.

[0028] By installing a filter assembly 3 at the inlet of heat exchange tube 2, solid impurities such as fibers, carbon compounds, and metal particles generated by the aging and decomposition of insulating oil can be effectively blocked from entering the interior of heat exchange tube 2. This not only ensures the cleanliness of the inner wall of heat exchange tube 2, avoiding the adhesion of gel-like substances and potential physical blockage, but also provides a reliable guarantee for the smooth circulation of oil and efficient heat exchange within the tube. In addition, the first filter screen 6 adopts a multi-layered stacked and staggered filter screen structure, which not only helps guide the insulating oil to pass through evenly and reduces local flow resistance, but also ensures excellent corrosion resistance and high temperature resistance in its material selection, adapting to the harsh working environment of oil-immersed transformers. By setting multiple oil inlet channels, this design significantly increases the flow rate of insulating oil entering heat exchange tube 2 while maintaining the original diameter of heat exchange tube 2, and can still maintain good oil flow capacity even after installing filter assembly 3. In summary, this design, through the above innovative structure, achieves the technical effects of effectively avoiding blockage, ensuring oil circulation efficiency, improving heat dissipation performance, and ensuring stable operation of equipment, providing a beneficial solution to existing technical problems.

[0029] It is worth mentioning that oil holes 11 are provided on both sides of the oil tank 1 for the heat exchange tube 2 to pass through. A groove 12 is provided at the inlet of the oil hole 11. Sealing sleeves 9 are provided at both ends of the groove 12 and the inlet of the heat exchange tube 2. The inner wall of the sealing sleeve 9 is provided with O-ring seals 8. When the sealing sleeve 9 abuts against the heat exchange tube 2, it works with the O-ring seals 8 to prevent the insulating oil from penetrating to the outside. When the sealing sleeve 9 abuts against the first tube body 4 or the third tube body 23, it works with the O-ring seals 8 to prevent the external insulating oil from penetrating into the heat exchange tube 2.

[0030] It is worth mentioning that the heat exchange tube 2 is equipped with a flange 21 and is connected and fixed to the oil tank 1 by screws. The outer wall of the heat exchange tube 2 is provided with several equally spaced heat dissipation fins 22. The insulating oil carrying heat flows through the heat exchange tube 2 and transfers heat to the heat dissipation fins 22 through heat conduction. The heat dissipation fins 22 exchange heat with the outside cold air to reduce the temperature of the insulating oil. After the temperature of the insulating oil drops, its density increases and it falls naturally under the action of gravity and is discharged from the oil outlet 232, forming a continuous natural circulation cooling process.

[0031] It is worth mentioning that the outlet of the heat exchange tube 2 is provided with a threaded connection to a third tube body 23. The third tube body 23 is provided with an outwardly expanding oil outlet 231. The end face of the oil outlet 231 is provided with several equally spaced and inclined oil outlet holes 232 evenly distributed around its axis. The oil outlet 231 adopts a trumpet-shaped design to increase the oil output. At the same time, the inclined oil outlet holes 232 guide the insulating oil to flow away from the axis of the oil outlet 231, thereby avoiding turbulence and accumulation in the area of ​​the oil outlet holes 232.

[0032] It is worth mentioning that the first tube body 4 is provided with a nut part 43, the nut part 43 is provided with a connecting part 44, and is threadedly connected to the heat exchange tube 2;

[0033] It is worth mentioning that the inlet of the second tube 5 is provided with a first countersunk hole 51 to accommodate the first filter screen 6, and the outlet of the second tube 5 is provided with a second countersunk hole 52 to accommodate the second filter screen 7.

[0034] It is worth mentioning that the first filter screen 6 is a porous metal plate, and the second filter screen 7 is a metal fiber mesh. The porous metal plate mainly intercepts solids with larger pore sizes, while the metal fiber mesh mainly intercepts solids and particles with smaller pore sizes. The multiple stacked first filter screens 6 are connected and fixed to each other through a sintering process.

[0035] The above design scheme enables the product to achieve the advantages of avoiding blockages and stable operation.

[0036] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A clog-resistant oil-immersed transformer, comprising an oil tank (1), wherein a plurality of heat exchange tubes (2) are arranged in an array on both sides of the oil tank (1), and a filter assembly (3) is provided at the inlet of the heat exchange tubes (2) located above the oil tank (1), characterized in that: The filter assembly (3) includes a first tube (4) and a second tube (5). The first tube (4) is provided with a first oil inlet channel (41). The first oil inlet channel (41) is provided with at least one second oil inlet channel (42) evenly distributed around its center point. The second tube (5) is threadedly connected to the first oil inlet channel (41) and the second oil inlet channel (42). The inlet of the second tube (5) is provided with a plurality of stacked and staggered first filter screens (6). The outlet of the second tube (5) is provided with a second filter screen (7).

2. The anti-clogging oil-immersed transformer according to claim 1, characterized in that: The oil tank (1) has oil holes (11) on both sides for the heat exchange tube (2) to pass through. The inlet of the oil hole (11) is provided with a sink (12). The sink (12) and the inlets at both ends of the heat exchange tube (2) are provided with sealing sleeves (9). The inner wall of the sealing sleeve (9) is provided with an O-ring (8).

3. The anti-clogging oil-immersed transformer according to claim 1, characterized in that: The heat exchange tube (2) is provided with a flange (21) and is connected and fixed to the oil tank (1) by screws. The outer wall of the heat exchange tube (2) is provided with a number of equally spaced heat dissipation fins (22).

4. The anti-clogging oil-immersed transformer according to claim 1, characterized in that: The heat exchange tube (2) is provided with a threaded connection to a third tube body (23) at its outlet. The third tube body (23) is provided with an outwardly extending oil outlet (231). The end face of the oil outlet (231) is provided with a number of equally spaced and inclined oil outlet holes (232) evenly distributed around its axis.

5. The anti-clogging oil-immersed transformer according to claim 1, characterized in that: The first tube body (4) is provided with a nut part (43), and the nut part (43) is provided with a connecting part (44) and is threadedly connected to the heat exchange tube (2).

6. The anti-clogging oil-immersed transformer according to claim 1, characterized in that: The second tube (5) has a first recessed hole (51) at its inlet to accommodate the first filter screen (6), and a second recessed hole (52) at its outlet to accommodate the second filter screen (7).

7. The anti-clogging oil-immersed transformer according to any one of claims 2 to 6, characterized in that: The first filter screen (6) is a porous metal plate, and the second filter screen (7) is a metal fiber mesh.

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