An oil-immersed transformer oil guide device

Abstract

The present invention discloses an oil-immersed transformer oil guide device, which relates to the technical field of oil-immersed transformer heat dissipation. The oil-immersed transformer oil guide device includes an oil guide plate, three mounting components, and an oil channel. The oil guide plate is provided with three holes at equal intervals. The mounting components penetrate the holes and are clamped to the oil guide plate. All mounting components are clamped between the coils of the oil-immersed transformer winding, and the oil guide plate is parallel to the coils. The oil guide plate is provided with oil channels along the radial direction. The oil channels include a main oil channel and an auxiliary oil channel. The head end of the auxiliary oil channel is connected to the main oil channel near the center of the oil guide plate, and the end end of the auxiliary oil channel is connected to the main oil channel away from the center of the oil guide plate. The current technology mainly solves the technical problem that the oil flow velocity in the oil-immersed transformer is limited to a lower speed to avoid the accumulation of charge on the surface of the insulating medium, but the slow oil flow velocity makes it difficult for the oil in some areas to flow, thereby reducing the heat dissipation effect of the oil-immersed transformer.

Description

Technical Field

[0001] The invention relates to the technical field of heat dissipation of oil-immersed transformers, and in particular to an oil-guiding device for an oil-immersed transformer. Background Art

[0002] During operation, oil-immersed transformers, due to their large size and difficulty dissipating heat naturally, often require an oil guide mechanism to rapidly circulate the transformer oil within the tank to dissipate heat. However, as the oil flows, it rubs against the oil channels of the oil guide mechanism, causing the oil flow and the channels to become charged with positive and negative charges, respectively. This in turn causes charge accumulation on the surface of the insulating medium, ultimately leading to discharges that can endanger the safe operation of power equipment and even affect the stability of the power system.

[0003] At present, the current technology mainly limits the oil flow velocity in the oil-immersed transformer to a lower speed to avoid the accumulation of charge on the surface of the insulating medium. However, due to the slow oil flow velocity, the oil in some areas is difficult to flow, which reduces the heat dissipation effect of the oil-immersed transformer. Summary of the Invention

[0004] The present invention provides an oil-immersed transformer oil guide device, which solves the technical problem that the current technology mainly limits the oil flow velocity in the oil-immersed transformer to a lower speed to avoid the accumulation of charge on the surface of the insulating medium, but the slow oil flow velocity makes it difficult for the oil to flow in some areas, thereby reducing the heat dissipation effect of the oil-immersed transformer.

[0005] A first aspect of the present invention provides an oil-immersed transformer oil guide device, comprising an oil guide plate, three mounting assemblies, and an oil channel;

[0006] The oil guide plate is provided with three holes at equal intervals, and the mounting assembly passes through the holes and is clamped to the oil guide plate;

[0007] All the mounting components are clamped between the coils of the oil-immersed transformer winding, and the oil guide plate is parallel to the coils;

[0008] The oil guide plate is provided with the oil passages in the radial direction, and the oil passages include main oil passages and auxiliary oil passages;

[0009] The auxiliary oil passage is connected to the main oil passage at a position close to the center of the oil guide plate at a head end, and is connected to the main oil passage at a position away from the center of the oil guide plate at a tail end.

[0010] Optionally, the mounting assembly includes a first spacer, a second spacer, and a spacer nut;

[0011] The top of the first cushion block passes through the hole and is engaged with the bottom of the second cushion block;

[0012] The spacer nut is threadedly connected to the first spacer, and the top of the spacer nut abuts against the bottom of the oil guide plate.

[0013] Optionally, the main oil channel is not perpendicular to the plane of the oil guide plate;

[0014] The main oil channel is a through structure;

[0015] The main oil channel is connected to the bottom of the oil guide plate near the center of the oil guide plate and the top of the oil guide plate away from the center of the oil guide plate.

[0016] Optionally, the first cushion block includes a clamping block, a screw and a chassis;

[0017] The bottom of the clamping block is fixedly connected to the top of the screw, and the top of the screw passes through the hole and is clamped with the bottom of the second cushion block through the clamping block;

[0018] The bottom of the screw is fixedly connected to the top of the chassis, and the bottom of the chassis abuts against one side of the wire cake;

[0019] The top of the screw rod is provided with an external thread which is threadedly connected to the spacer nut.

[0020] Optionally, the spacer nut includes a nut washer and a nut body;

[0021] The top of the nut body abuts against the bottom of the nut washer, and the top of the nut washer abuts against the bottom of the oil guide plate;

[0022] The nut body is provided with an internal threaded hole, the top of the screw rod passes through the internal threaded hole, and is threadedly connected to the internal threaded hole through the external thread.

[0023] Optionally, the second cushion block is provided with a slot;

[0024] The card block is arranged inside the card slot.

[0025] Optionally, a plurality of grooves are provided on the top of the oil guide plate;

[0026] The depth of the groove is 2 to 5 times the diameter of the groove.

[0027] Optionally, the groove is circular;

[0028] The diameter of the groove is 1 mm to 25 mm, and the diameter of the groove gradually increases along the radial direction.

[0029] Optionally, the oil guide plate and the mounting assembly are both made of polytetrafluoroethylene.

[0030] Optionally, the oil guide plate is in the shape of a hollow circular arc.

[0031] It can be seen from the above technical solutions that the present invention has the following advantages:

[0032] The present invention utilizes an assembly to clamp an oil deflector plate between the coils of a transformer winding. Oil channels are provided throughout the oil deflector plate. The provision of these channels allows oil in dead zones to flow unidirectionally through the oil deflector plate, overcoming the technical problem of existing technologies that primarily limit the oil flow rate within the oil-immersed transformer to a low velocity to prevent charge accumulation on the surface of the insulating medium. However, this slow flow makes it difficult for the oil to flow in certain areas, reducing the transformer's heat dissipation. Compared to conventional oil deflectors, the oil channels of the present invention allow the oil flow within the transformer to reach a higher velocity, thereby improving the transformer's heat dissipation capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 A schematic diagram of the installation of an oil-immersed transformer oil guide device and transformer windings provided in an embodiment of the present application;

[0035] Figure 2 A schematic structural diagram of an oil-immersed transformer oil guide device provided in an embodiment of the present application;

[0036] Figure 3 A schematic structural diagram of a first cushion block provided in an embodiment of the present application;

[0037] Figure 4 A schematic structural diagram of a second spacer and a spacer nut provided in an embodiment of the present application;

[0038] Figure 5 A schematic structural diagram of the oil guide plate provided in an embodiment of the present application;

[0039] Figure 6 A schematic diagram of the structure of the oil channel provided in an embodiment of the present application;

[0040] The accompanying drawings are numerals as follows:

[0041] 1. Oil guide plate; 2. First gasket; 3. Second gasket; 4. Gasket nut; 5. Hole; 6. Screw; 7. Block; 8. Slot; 9. Chassis; 10. Nut body; 11. Nut washer; 12. External thread; 13. Internal threaded hole; 14. Oil channel; 15. Main oil channel; 16. Auxiliary oil channel; 17. Groove; 18. Coil; 19. Iron core. DETAILED DESCRIPTION

[0042] An embodiment of the present invention provides an oil-immersed transformer oil guide device for solving the technical problem that current technology mainly limits the oil flow velocity in the oil-immersed transformer to a lower speed to avoid charge accumulation on the surface of the insulating medium. However, due to the slow oil flow velocity, the oil in some areas is difficult to flow, which reduces the heat dissipation effect of the oil-immersed transformer.

[0043] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0044] For easier understanding, see Figure 1-6 , an oil-immersed transformer oil guide device, comprising an oil guide plate 1, three mounting components and an oil channel 14;

[0045] The oil guide plate 1 is provided with three holes 5 at equal intervals, and the mounting assembly passes through the holes 5 and is engaged with the oil guide plate 1;

[0046] All the mounting components are clamped between the coils 18 of the oil-immersed transformer winding, and the oil guide plate 1 is parallel to the coils 18;

[0047] The oil guide plate 1 is provided with an oil passage 14 in the radial direction, and the oil passage includes a main oil passage 15 and an auxiliary oil passage 16;

[0048] The head end of the auxiliary oil passage 16 is connected to the main oil passage 15 near the center of the oil guide plate 1 , and the tail end of the auxiliary oil passage 16 is connected to the main oil passage 15 away from the center of the oil guide plate 1 .

[0049] In this embodiment of the present invention, an oil-immersed transformer oil guide device 1 comprises an oil guide plate 1, multiple mounting components, and an oil passage 14. The oil guide plate 1 is provided with a plurality of equally spaced holes 5 extending through it, each of which is fitted with a mounting component. The oil guide plate 1 is secured to the coil 18 of the oil-immersed transformer winding via the mounting components, with the oil guide plate 1 positioned parallel to the coil 18. The center of the oil guide plate 1 faces the transformer core 19, and the oil passage 14 is provided through it.

[0050] See Figure 1-3As shown, the mounting assembly includes a first gasket 2, a second gasket 3 and a gasket nut 4; the top of the first gasket 2 passes through a hole 5 and is clamped with the bottom of the second gasket 3; the gasket nut 4 is threadedly connected to the first gasket 2, and the top of the gasket nut 4 abuts against the bottom of the oil guide plate 1.

[0051] In this embodiment of the present invention, the mounting assembly includes a first spacer 2, a second spacer 3, and a spacer nut 4. A hole 5 extends through the top of the first spacer 2 and connects to the bottom of the second spacer 3 via a mortise and tenon joint. The spacer nut 4 then reinforces the first spacer 2, securing the mounting assembly to the hole 5 in the oil deflector 1.

[0052] See Figure 1-2 As shown in 5-6, the main oil channel 15 is not perpendicular to the plane of the oil guide plate 1; the main oil channel 15 is a through structure, and the main oil channel 15 connects the bottom of the oil guide plate 1 close to the center of the oil guide plate 1 and the top of the oil guide plate 1 away from the center of the oil guide plate 1.

[0053] In an embodiment of the present invention, the oil channel 14 includes a main oil channel 15 and an auxiliary oil channel 16. Auxiliary oil channels 16 are provided on both sides of the main oil channel 15. When the transformer oil flows through the oil channel 14 on the surface of the oil guide plate 1, a portion of the oil flows into the main oil channel 15, passes through the oil guide plate 1, and the other portion enters the end bend of the auxiliary oil channel 16. Due to the influence of its pressure and flow rate, the oil entering the auxiliary oil channel 16 flows out of the auxiliary oil channel 16 from the other end of the auxiliary oil channel 16 in the opposite direction of the oil flow in the main oil channel 15, preventing the oil in the main oil channel 15 from entering the auxiliary oil channel 16 from this end, thereby achieving one-way oil flow. By providing auxiliary oil channels 16 on both sides of the main oil channel 15, the transformer oil is evenly guided to various parts of the transformer winding and other key components, avoiding local overheating and ensuring uniform temperature distribution throughout the transformer. At the same time, the contact area between the oil and the winding surface is increased, accelerating heat transfer, thereby improving cooling efficiency.

[0054] In another embodiment, the oil passage 14 includes a main oil passage 15, an auxiliary oil passage 16 and a filter. The main oil passage 15 is provided with a filter to remove solid particles in the transformer oil, such as metal chips, fibers, dust, etc., thereby avoiding the formation of sludge due to long-term operation, which may cause blockage of the oil passage 14, extending the service life of the oil, and improving the reliability of transformer operation.

[0055] In another embodiment, a plurality of oil channels 14 are provided at equal intervals through the surface of the oil guide plate 1 .

[0056] See Figure 1-3As shown, the first cushion block 2 includes a clamping block 7, a screw 6 and a chassis 9; the bottom of the clamping block 7 is fixedly connected to the top of the screw 6, and the top of the screw 6 passes through the hole 5 and is clamped with the bottom of the second cushion block 3 through the clamping block 7; the bottom of the screw 6 is fixedly connected to the top of the chassis 9, and the bottom of the chassis 9 abuts against one side of the wire cake 18; the top of the screw 6 is provided with an external thread 12 which is threadedly connected to the cushion block nut 4.

[0057] In this embodiment of the present invention, the first spacer 2 includes a block 7, a screw 6, and a chassis 9 with a mortise and tenon structure. The bottom of the block 7 is fixedly connected to the top of the screw 6, and the block 7 is located at the center of the top of the screw 6. The bottom of the screw 6 is fixedly connected to the top of the chassis 9, and the screw 6 is located at the center of the top of the chassis 9. The hole 5 at the top of the screw 6 is connected to the slot 8 provided at the bottom of the second spacer 3 through the block 7. The bottom of the chassis 9 abuts against one side of the wire coil 18. The top of the screw 6 is provided with an external thread 12, which is threadedly connected to the spacer nut 4.

[0058] See Figure 1-2 As shown in Figure 4, the spacer nut 4 includes a nut washer 11 and a nut body 10; the top of the nut body 10 abuts against the bottom of the nut washer 11, and the top of the nut washer 11 abuts against the bottom of the oil guide plate 1; the nut body 10 is provided with an internal threaded hole 13, the top of the screw rod 6 passes through the internal threaded hole 13, and is threadedly connected to the internal threaded hole 13 through the external thread 12.

[0059] In this embodiment of the present invention, the first spacer 2 is fixed to the oil deflector 1 via the nut body 10. The nut body 10 is then used to fine-tune the mounting assembly so that both ends of the mounting assembly abut against the wire coil 18. By placing a nut washer 11 between the nut body 10 and the oil deflector 1, the pressure exerted by the nut body 10 on the oil deflector 1 is dispersed, preventing localized stress concentration and minimizing damage to the oil deflector 1. Furthermore, the friction between the nut and the oil deflector 1 is increased, helping to prevent the nut from loosening due to vibration.

[0060] See Figure 1-2 As shown in , 4 , the second cushion block 3 is provided with a card slot 8 ; the card block 7 is arranged inside the card slot 8 .

[0061] In the embodiment of the present invention, the second cushion block 3 is provided with a clamping groove 8 of a mortise and tenon structure, which is connected to the clamping block 7 adapted to the first cushion block 2 through mortise and tenon.

[0062] See Figure 5 As shown, a plurality of grooves 17 are provided on the top of the oil guide plate 1 ; the depth of the grooves 17 is 2 to 5 times the diameter of the grooves 17 .

[0063] In an embodiment of the present invention, the top of the oil guide plate 1 is provided with multiple grooves 17. During transformer operation, the grooves 17 absorb sound waves with a frequency less than 1000 Hz generated by the vibration of the iron core 19, reducing transformer operating noise. This allows large oil-immersed power transformers to achieve higher oil flow rates than before, thereby increasing heat dissipation efficiency. The depth of the grooves 17 is 2 to 5 times the diameter of the grooves 17. Deeper grooves 17 provide larger oil flow channels, facilitating even distribution of transformer oil on the oil guide plate 1. This ensures that the oil flow covers more of the winding surface, improving cooling efficiency. Furthermore, this prevents the oil flow from short-circuiting on the oil guide plate 1 (i.e., oil flowing directly from one groove 17 to another without passing through the winding surface), thereby ensuring that the oil flow effectively cools the winding.

[0064] It should be noted that the groove 17 is circular; the diameter of the groove 17 is 1 mm to 25 mm, and the diameter of the groove 17 gradually increases along the radial direction.

[0065] In the embodiment of the present invention, the groove 17 is circular, the diameter of the groove 17 is 1 mm to 25 mm, and the diameter of the groove 17 follows a gradient exponential distribution along the radial direction (i.e., assuming that the diameter of the smallest groove 17 is r, the diameter of the i-th hole 5 is r i =r×k i , k is any real number ranging from 1 to 5). The radially increasing grooves 17 increase the contact area between the oil and the oil guide plate 1, optimizing the heat exchange process and improving cooling efficiency. Furthermore, the oil guide plate 1 can adapt to radial temperature gradients, ensuring consistent cooling.

[0066] In another embodiment, the grooves 17 are arranged in order from small to large along a ray with the center of the oil guide plate 1 as the vertex.

[0067] It should be noted that the oil guide plate 1 and the mounting assembly are both made of polytetrafluoroethylene.

[0068] In this embodiment of the present invention, the oil deflector plate 1 and mounting assembly are made of polytetrafluoroethylene (PTFE). Friction between PTFE and transformer oil produces virtually no charge transfer, effectively preventing electrical discharge failures caused by friction between the oil flow and the oil deflector plate 1. PTFE also maintains its physical and chemical properties over a wide temperature range, typically operating within a temperature range of -200°C to 260°C. This allows the oil deflector plate 1 to adapt to temperature fluctuations during transformer operation.

[0069] It should be noted that the oil guide plate 1 is in the shape of a hollow arc.

[0070] In the embodiment of the present invention, the oil guide plate 1 is hollow arc-shaped, which can provide a continuous oil flow channel, helping to evenly distribute the transformer oil on the oil guide plate 1. At the same time, it can reduce the resistance of the oil flow on the oil guide plate 1, making the oil flow smoother.

[0071] In an embodiment of the present invention, an oil deflector plate is clamped between the coils of a transformer winding using an installation assembly, and an oil channel is provided through the oil deflector plate. The provision of the oil channel allows oil in the dead zone to flow unidirectionally through the oil deflector plate, thereby overcoming the technical problem that existing technologies, which primarily limit the oil flow velocity within the oil-immersed transformer to a low speed to prevent charge accumulation on the surface of the insulating medium, but the slow oil flow makes it difficult for the oil to flow in some areas, thereby reducing the heat dissipation effect of the oil-immersed transformer. Compared with traditional oil deflectors, the oil channel of the present invention allows the oil flow within the transformer to have a higher flow rate, thereby improving the heat dissipation capacity of the oil-immersed transformer.

[0072] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0073] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0074] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0075] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An oil-immersed transformer oil guide device, characterized in that: Includes oil deflector, three mounting assemblies and oil passages; The oil guide plate is provided with three holes at equal intervals, and the mounting assembly passes through the holes and is clamped to the oil guide plate; All the mounting components are clamped between the coils of the oil-immersed transformer winding, and the oil guide plate is parallel to the coils; The oil guide plate is provided with the oil passages in the radial direction, and the oil passages include main oil passages and auxiliary oil passages; The auxiliary oil passage is connected at its head end to the main oil passage near the center of the oil guide plate, and the auxiliary oil passage is connected at its tail end to the main oil passage away from the center of the oil guide plate. The main oil channel is not perpendicular to the plane of the oil guide plate; The main oil channel is a through structure; The main oil channel is connected to the bottom of the oil guide plate near the center of the oil guide plate and the top of the oil guide plate away from the center of the oil guide plate.

2. The oil-immersed transformer oil guide device according to claim 1, characterized in that: The mounting assembly includes a first spacer, a second spacer and a spacer nut; The top of the first cushion block passes through the hole and is engaged with the bottom of the second cushion block; The spacer nut is threadedly connected to the first spacer, and the top of the spacer nut abuts against the bottom of the oil guide plate.

3. The oil-immersed transformer oil guide device according to claim 2, characterized in that: The first cushion block includes a clamping block, a screw and a base plate; The bottom of the clamping block is fixedly connected to the top of the screw, and the top of the screw passes through the hole and is clamped with the bottom of the second cushion block through the clamping block; The bottom of the screw is fixedly connected to the top of the chassis, and the bottom of the chassis abuts against one side of the wire cake; The top of the screw rod is provided with an external thread which is threadedly connected to the spacer nut.

4. The oil-immersed transformer oil guide device according to claim 3, characterized in that: The spacer nut includes a nut washer and a nut body; The top of the nut body abuts against the bottom of the nut washer, and the top of the nut washer abuts against the bottom of the oil guide plate; The nut body is provided with an internal threaded hole, the top of the screw rod passes through the internal threaded hole, and is threadedly connected to the internal threaded hole through the external thread.

5. The oil-immersed transformer oil guide device according to claim 3, characterized in that: The second cushion block is provided with a slot; The card block is arranged inside the card slot.

6. The oil-immersed transformer oil guide device according to claim 1, characterized in that: The top of the oil guide plate is provided with a plurality of grooves; The depth of the groove is 2 to 5 times the diameter of the groove.

7. The oil-immersed transformer oil guide device according to claim 6, characterized in that: The groove is circular; The diameter of the groove is 1 mm to 25 mm, and the diameter of the groove gradually increases along the radial direction.

8. The oil-immersed transformer oil guide device according to claim 1, characterized in that: The oil guide plate and the mounting assembly are both made of polytetrafluoroethylene.

9. The oil-immersed transformer oil guide device according to claim 1, characterized in that: The oil guide plate is in a hollow arc shape.

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