Oil-immersed transformer with self-responsive oil tank

Abstract

The utility model discloses an oil-immersed transformer with self -response ability oil tank relates to electric power equipment technical field. It includes transformer body and fixed on pressure oil tank, and pressure oil tank is communicated with transformer body oil storage cavity through oil pipe, and is equipped with the floating type isolation membrane in the tank, and the inner chamber is divided into the oil cavity and the air chamber, the outer edge of isolation membrane and the tank body inner wall sliding seal cooperation, can move along the axial movement to respond the oil volume change. The utility model discloses through isolation membrane realizes the physical isolation of oil and air, thoroughly puts an end to oil liquid hygroscopicity, oxidation, delays the oil quality deterioration, and the sliding type response mechanism can instantaneously compensate the tiny change of oil volume, and maintains the stable system pressure, and discards the traditional elastic capsule, and eliminates the breakage pollution risk from the root. Its simple structure is reliable, effectively promotes transformer operation stability and service life, and is applicable to various oil-immersed transformers.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, specifically to an oil-immersed transformer with an oil tank having self-response capability. Background Technology

[0002] Oil-immersed transformers play a crucial role in the conversion and transmission of electrical energy in power systems. The transformer oil inside the transformer not only serves as insulation but also heat dissipation, and the quality of the oil directly affects the operational reliability and service life of the transformer.

[0003] Existing oil-immersed transformers are usually equipped with an oil conservator (expansion tank) to compensate for the volume expansion and contraction of the oil due to temperature changes. Traditional oil conservators are connected to the atmosphere through a breather. This structure inevitably leads to continuous contact between the oil and moisture and oxygen in the air, which can easily cause the oil to absorb moisture and oxidize, resulting in oil quality deterioration. This not only reduces insulation performance but also accelerates the corrosion of internal components, shortening the equipment maintenance cycle and service life.

[0004] To address these issues, some oil conservators employ a capsule-type isolation structure, using an elastic capsule to separate the oil chamber from the gas chamber. However, these capsules are made of fully elastic materials and are subject to fatigue under long-term expansion and contraction cycles caused by changes in oil volume, posing a significant risk of rupture. Once a capsule ruptures, its fragments can directly contaminate the entire oil system, leading to more serious equipment failures, and resulting in extremely high maintenance difficulty and costs.

[0005] Meanwhile, the elastic response of traditional bladders exhibits hysteresis, making it difficult to accurately compensate for minute, instantaneous changes in oil volume. This results in significant internal pressure fluctuations, failing to provide a stable operating environment for the transformer. Therefore, there is an urgent need for an oil volume management solution that can completely isolate the oil from air, possess strong fatigue resistance, and provide timely pressure compensation to address the long-term operational pain points of traditional oil-immersed transformers. Utility Model Content

[0006] To address the shortcomings in the prior art, this utility model provides an oil-immersed transformer with a self-responsive oil tank.

[0007] The technical solution adopted in this utility model is: an oil-immersed transformer with a self-responsive oil tank, including a transformer body and a pressure oil tank fixed on the transformer body. The pressure oil tank is connected to the oil storage cavity of the transformer body through an oil pipeline. A floating isolation membrane is provided inside the pressure oil tank. The isolation membrane divides the inner cavity of the tank into an oil cavity for containing transformer oil and a gas cavity for containing buffer gas. The outer edge of the isolation membrane is slidably sealed with the inner wall of the tank and can move axially along the inner wall of the tank in response to changes in the volume of oil.

[0008] Furthermore, the isolation membrane is composed of a metal foil substrate and a rubber coating covering its surface.

[0009] Furthermore, the outer edge of the isolation membrane is provided with a connecting ring, and the outer edge of the connecting ring is provided with at least one annular sealing groove. An "O"-ring is installed in the annular sealing groove, and the "O"-ring is tightly attached to the inner wall of the tank to form a dynamic seal.

[0010] Furthermore, the O-ring is made of fluororubber.

[0011] Furthermore, the top of the pressure tank is equipped with an inflation valve and a pressure gauge, the inflation valve being used to regulate the gas pressure inside the air chamber.

[0012] Furthermore, the side wall of the pressure tank is provided with a transparent observation window for visual inspection of the position of the isolation membrane.

[0013] Furthermore, it also includes an arched bracket that is bolted to the transformer body. The arched bracket is provided with an oil tank hole. The bottom of the pressure oil tank is provided with a flange. The top of the pressure oil tank passes through the oil tank hole and is fixed to the arched bracket by the flange and fastening bolts. The bottom of the pressure oil tank is provided with an oil outlet hole connected to the oil pipeline. The transformer body below the oil outlet hole is provided with an oil inlet hole.

[0014] The beneficial effects of this utility model are: 1. Blocking oil deterioration pathways and extending equipment life: This invention uses a floating isolation membrane to divide the pressure oil tank into independent oil and air chambers. Combined with a completely sealed system design, it achieves physical isolation between the oil and external air, fundamentally preventing contact between the oil and moisture or oxygen. This structure effectively avoids moisture absorption and oxidation of the oil, significantly slowing down the rate of oil deterioration. It not only maintains the oil's insulation performance and heat dissipation efficiency for a long time but also reduces corrosion and wear on internal components, greatly extending the transformer's maintenance cycle and overall service life.

[0015] 2. Improve structural reliability and eliminate system contamination risk: Compared with the traditional fully elastic capsule structure, the separator in this solution uses a metal substrate, which greatly enhances its fatigue resistance and mechanical strength. It can withstand the axial movement caused by changes in oil volume over a long period of time, effectively reducing the risk of rupture. This fundamentally eliminates the potential for secondary faults caused by capsule rupture, improves the reliability of transformer operation, and reduces maintenance difficulty and cost.

[0016] 3. Achieving dynamic pressure compensation and optimizing the operating environment: The sliding seal between the isolation diaphragm and the inner wall of the tank allows for smooth and immediate axial movement in response to changes in oil volume, providing a precise response to minute fluctuations in oil volume. This dynamic compensation mechanism sustainably maintains stable internal system pressure, avoiding pressure fluctuations caused by the lag in the elastic response of traditional bladders. This provides a stable and superior operating environment for the transformer's internal components, further ensuring the safety and stability of equipment operation.

[0017] In addition to the objectives, features and advantages described above, this utility model has other objectives, features and advantages.

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0019] Fig. 1 This is a schematic diagram of the structure of this utility model.

[0020] Fig. 2 This is a cross-sectional schematic diagram of the present invention.

[0021] Figs. 1-2 In the middle section: 1. Transformer body; 2. Pressure oil tank; 3. Oil pipeline; 4. Isolation membrane; 5. Oil chamber; 6. Gas chamber; 7. Connecting ring; 8. "O" ring seal; 9. Air filling valve; 10. Pressure gauge; 11. Transparent observation window; 12. Arched support; 13. Oil tank hole; 14. Flange; 15. Oil outlet; 16. Oil inlet. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0024] This invention provides an oil-immersed transformer with an oil tank that has self-responsive capability.

[0025] In this embodiment, refer to Figs. 1-2The oil-immersed transformer with a self-responsive oil tank includes a transformer body 1 and a pressure oil tank 2 fixed on the transformer body 1. The pressure oil tank 2 is connected to the oil storage cavity of the transformer body through an oil pipeline 3. A floating isolation membrane 4 is provided inside the pressure oil tank. The isolation membrane 4 divides the inner cavity of the tank into an oil cavity 5 for containing transformer oil and a gas cavity 6 for containing buffer gas. The outer edge of the isolation membrane is slidably sealed with the inner wall of the tank and can move axially along the inner wall of the tank in response to changes in the volume of oil.

[0026] In the above technical solution, the pressure oil tank is connected to the oil storage cavity of the transformer body through the oil pipeline. The floating isolation membrane inside the tank divides the inner cavity into an independent oil cavity (containing transformer oil) and a gas cavity (containing buffer gas). The outer edge of the isolation membrane is fitted with a sliding seal to the inner wall of the tank and can move freely along the axial direction of the tank. Its movement directly responds to the volume change of the transformer oil due to factors such as temperature. When the oil volume expands, it pushes the isolation membrane to move towards the gas cavity side. When the oil volume contracts, the isolation membrane returns to the oil cavity side.

[0027] The above structure constructs a completely closed oil management system. The physical separation of the separator membrane completely isolates the oil from the outside air, eliminating moisture absorption and oxidation of the oil at the source and delaying oil quality deterioration. The sliding response mechanism replaces the expansion and contraction deformation of the traditional elastic capsule, which can make immediate compensation for small changes in oil volume, continuously maintain stable system pressure, and optimize the transformer operating environment. The abandonment of the fully elastic capsule structure lays the foundation for subsequent improvement of the separator membrane's fatigue resistance and solves the pain point of contamination caused by the rupture of traditional capsules.

[0028] Specifically, the isolation membrane is composed of a metal foil substrate and a rubber coating covering its surface.

[0029] In this embodiment, the foil substrate significantly improves the fatigue resistance and mechanical strength of the separator, enabling it to withstand axial reciprocating motion for extended periods without easily breaking, thus solving the fatigue rupture problem of traditional fully elastic capsules. The rubber coating prevents direct contact between the metal substrate and the oil, preventing substrate corrosion and oil contamination, while also improving the overall sealing compatibility of the separator and ensuring reliable separation between the oil and gas chambers. The composite structure achieves dual optimization of "strength and compatibility," further enhancing the service life and operational reliability of the separator.

[0030] Specifically, the outer edge of the isolation membrane is provided with a connecting ring 7, and the outer edge of the connecting ring 7 is provided with at least one annular sealing groove. An "O"-ring seal 8 is installed in the annular sealing groove, and the "O"-ring seal is tightly attached to the inner wall of the tank to form a dynamic seal.

[0031] In this embodiment, a connecting ring is provided on the outer edge of the isolation membrane, and at least one annular sealing groove is formed on the outer edge of the connecting ring. An O-ring is installed in the groove, and the sealing ring is tightly fitted to the inner wall of the tank, forming a dynamic sealing structure that moves axially with the isolation membrane. When the isolation membrane moves, the sealing ring always maintains tight contact with the inner wall of the tank, continuously blocking the medium exchange between the oil cavity and the gas cavity. This improves the sealing reliability and prevents oil and gas from crossing the cavities.

[0032] Specifically, the O-ring is made of fluororubber.

[0033] In this embodiment, the material properties of fluororubber are utilized to maintain stable elasticity and sealing performance in environments with transformer oil immersion, temperature fluctuations, and pressure changes.

[0034] Specifically, the top of the pressure tank is equipped with an inflation valve 9 and a pressure gauge 10. The inflation valve is used to regulate the gas pressure in the air chamber.

[0035] In this embodiment, an inflation valve and a pressure gauge are added to the top of the pressure oil tank: the inflation valve is connected to the air chamber and can be used to fill or discharge buffer gas into the air chamber through external equipment; the pressure gauge monitors the pressure value in the air chamber in real time, providing data for the adjustment of the inflation valve. With the cooperation of the two, the pressure in the air chamber can be maintained within a preset range.

[0036] Specifically, the side wall of the pressure oil tank is provided with a transparent observation window 11 for visually inspecting the position of the isolation membrane.

[0037] In this embodiment, a transparent observation window is provided on the side wall of the pressure oil tank: the observation window is sealed to the tank body, and its position corresponds to the movement range of the isolation membrane. Maintenance personnel can directly observe the axial position of the isolation membrane visually.

[0038] Specifically, it also includes an arched bracket 12 that is bolted to the transformer body. The arched bracket 12 is provided with an oil tank hole 13. The bottom of the pressure oil tank is provided with a flange 14. The top of the pressure oil tank passes through the oil tank hole and is fixed to the arched bracket by the flange and fastening bolts. The bottom of the pressure oil tank is provided with an oil outlet hole 15 that is connected to the oil pipeline. The transformer body below the oil outlet hole is provided with an oil inlet hole 16.

[0039] In this embodiment, the bracket is fixed to the transformer body with bolts. The bracket has an oil tank opening, through which the top of the pressure oil tank passes and is then fixed to the bracket via a bottom flange and fastening bolts. The oil outlet at the bottom of the pressure oil tank is connected to an oil delivery pipe, the other end of which is connected to the oil inlet of the transformer body, forming an oil flow path. The oil outlet is positioned above the oil inlet, effectively shortening the length of the oil delivery pipe, saving costs, and simplifying the structure.

[0040] Attention all technical personnel: Although this utility model has been described according to the specific embodiments above, the concept of this utility model is not limited to this utility model. Any modification that utilizes the concept of this utility model will be included within the scope of protection of this patent right.

Claims

1. An oil-immersed transformer having a self-responsive oil tank, comprising a transformer body and a pressure tank fixed to the transformer body, characterized in that: The pressure oil tank is connected to the oil storage cavity of the transformer body through an oil pipeline. The pressure oil tank is equipped with a floating isolation membrane, which divides the inner cavity of the tank into an oil cavity for containing transformer oil and a gas cavity for containing buffer gas. The outer edge of the isolation membrane is slidably sealed to the inner wall of the tank and can move axially along the inner wall of the tank in response to changes in the volume of oil.

2. The oil immersed transformer with self-responsive oil tank as claimed in claim 1 wherein: The isolation membrane is composed of a metal foil substrate and a rubber coating covering its surface.

3. The oil immersed transformer with self-responsive oil tank as claimed in claim 1 or 2, wherein: The outer edge of the isolation membrane is provided with a connecting ring, and the outer edge of the connecting ring is provided with at least one annular sealing groove. An "O"-ring is installed in the annular sealing groove, and the "O"-ring is tightly attached to the inner wall of the tank to form a dynamic seal.

4. The oil immersed transformer with self-responsive oil tank as claimed in claim 3 wherein: The "O" ring is made of fluororubber.

5. The oil immersed transformer with self-responsive oil tank as claimed in claim 1 wherein: The pressure tank is equipped with an inflation valve and a pressure gauge at the top. The inflation valve is used to regulate the gas pressure in the air chamber.

6. The oil immersed transformer with self-responsive oil tank as claimed in claim 1 wherein: The side wall of the pressure tank is provided with a transparent observation window for visual inspection of the position of the isolation membrane.

7. The oil immersed transformer with self-responsive oil tank as claimed in claim 1 wherein: It also includes an arched bracket that is bolted to the transformer body. The arched bracket has an oil tank hole. The bottom of the pressure oil tank has a flange. The top of the pressure oil tank passes through the oil tank hole and is fixed to the arched bracket by the flange and fastening bolts. The bottom of the pressure oil tank has an oil outlet hole connected to the oil pipeline. The transformer body below the oil outlet hole has an oil inlet hole.

Images