An oil-immersed transformer

Abstract

This utility model discloses an oil-immersed transformer, including a transformer casing, an oil conservator, an oil distribution block, an oil inlet pipe, an oil outlet pipe, a first check valve, and a second check valve. An oil outlet hole is provided on the top wall of the transformer casing. The main oil passage, the oil inlet passage, and the oil outlet passage within the oil distribution block are interconnected. The main oil passage is connected to the oil outlet hole. The oil inlet pipe connects to the bottom of the internal cavity of the transformer casing and the oil inlet passage. The oil outlet pipe connects to the oil outlet passage and the upper part of the internal cavity of the casing. The two check valves control the opening and closing of the oil inlet and outlet passages respectively. This oil-immersed transformer, through innovative oil circuit design, extends the oil inlet and outlet path, achieving unidirectional oil circulation. This allows the oil in the oil conservator to fully circulate into the transformer body, effectively solving the problem of poor oil circulation in traditional single-circuit systems. It significantly improves the transformer's heat dissipation performance, delays insulating oil aging, reduces maintenance costs, and improves equipment operational reliability and power supply stability.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically to an oil-immersed transformer. Background Technology

[0002] Oil-immersed transformers, as key equipment in power systems for voltage transformation and power transmission, play an indispensable role in power supply by using insulating oil for cooling and insulation. Among them, the oil conservator, a crucial component of the oil-immersed transformer, primarily compensates for the volume expansion and contraction of the insulating oil due to temperature changes, while also reducing the contact area between the insulating oil and air, thus slowing down the aging process of the insulating oil.

[0003] Currently, in common oil-immersed transformers, the oil conservator and the transformer body are connected only by a single oil passage. This simple connection method makes it difficult for the oil in the conservator to achieve effective circulation and exchange, preventing it from fully penetrating the transformer body to participate in cooling and insulation. On the one hand, insufficient oil circulation leads to heat accumulation inside the transformer, reducing heat dissipation efficiency and affecting the transformer's normal operating performance and service life. On the other hand, insufficiently circulated oil, remaining in a localized area for extended periods, accelerates its aging and performance degradation, increasing maintenance costs and the risk of equipment failure. Therefore, it is urgent to improve the oil passage structure of existing oil-immersed transformers to achieve efficient oil circulation in the conservator and improve the overall performance of the transformer. Utility Model Content

[0004] To address the shortcomings of the prior art, this utility model provides an oil-immersed transformer.

[0005] The technical solution adopted by this utility model is: an oil-immersed transformer, including a transformer shell and an oil conservator fixed on the transformer shell by a bracket, and also including an oil distribution block, an oil inlet pipe, an oil outlet pipe, a first check valve and a second check valve, and an oil outlet hole fixed on the top wall of the transformer shell;

[0006] The oil distribution block is provided with a main oil passage and an inlet oil passage and an outlet oil passage that are connected to the main oil passage. The main oil passage is connected to the outlet hole.

[0007] One end of the oil inlet pipe is connected to the oil inlet channel, and the other end is connected to the bottom of the internal cavity of the transformer casing;

[0008] One end of the oil outlet pipe is connected to the oil outlet channel, and the other end is connected to the upper part of the internal cavity of the transformer casing.

[0009] The first check valve is connected to the oil inlet passage on one side of the oil distribution block and is used to control the opening and closing of the oil inlet passage;

[0010] The second check valve is connected to the oil outlet passage on one side of the oil distribution block and is used to control the opening and closing of the oil outlet passage.

[0011] Furthermore, the oil distribution block is detachably fixed to the top of the transformer casing by bolts, which protrude from the inner wall of the oil conservator and connect to the oil distribution block.

[0012] Furthermore, a filter cover for covering the oil outlet is provided on the inner wall of the oil conservator at the oil outlet, and the filter cover is fixed to the oil conservator by the aforementioned bolts.

[0013] Furthermore, mounting blocks are provided on both side walls inside the oil conservator, and filter plates are connected between the mounting blocks.

[0014] Furthermore, the mounting block is provided with a "T"-shaped connecting groove, and both ends of the filter plate are provided with "T"-shaped connecting ends that connect with the "T"-shaped connecting groove.

[0015] Furthermore, the filter plate has a pore size of 0.5-3mm.

[0016] Furthermore, the filter pore diameter of the filter cover is 0.05 - 0.25 mm.

[0017] The beneficial effects of this utility model are:

[0018] I. This application significantly extends the oil inlet and outlet paths by setting up an oil distribution block, an oil inlet pipe, and an oil outlet pipe, with the oil inlet pipe connected to the bottom of the internal cavity of the transformer casing and the oil outlet pipe connected to the upper part of the internal cavity. Combined with the first and second one-way valves controlling the opening and closing of the oil circuit, unidirectional oil flow is achieved, allowing the oil in the oil conservator to circulate and alternately enter the transformer body, thus solving the problem of poor oil circulation caused by the traditional single oil circuit connection.

[0019] Second, efficient oil circulation greatly improves the transformer's heat dissipation performance. Fully circulated oil can more promptly remove the heat generated during transformer operation, effectively preventing internal heat buildup and ensuring the transformer remains at a stable operating temperature, thereby improving its operational performance and reliability.

[0020] Third, because the oil circulates fully, localized aging of the oil is reduced. This slows down the rate of performance degradation of the insulating oil, lowers transformer maintenance costs, extends the overall service life of the equipment, and also reduces the risk of equipment failure caused by oil aging, thereby improving the stability and security of the power supply.

[0021] In addition to the objectives, features and advantages described above, this utility model has other objectives, features and advantages.

[0022] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 This is a top view of the present invention.

[0025] Figure 3 for Figure 2 A schematic diagram of a partial cross-section at point AA.

[0026] Figure 4 for Figure 2 A schematic diagram of a local cross-section at point DD.

[0027] Figure 5 for Figure 3 A schematic diagram of a partial cross-section at point BB.

[0028] Figure 1-5 In the middle: 1. Transformer casing; 2. Bracket; 3. Oil conservator; 4. Oil distribution block; 5. Oil inlet pipe; 6. Oil outlet pipe; 7. First check valve; 8. Second check valve; 9. Oil outlet hole; 10. Main oil passage; 11. Oil inlet passage; 12. Oil outlet passage; 13. Bolt; 14. Filter cover; 15. Mounting block; 16. Filter plate; 17. "T" type connecting groove; 18. "T" type connecting end. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] This utility model provides an oil-immersed transformer.

[0032] In this embodiment, refer to Figure 1-5 The oil-immersed transformer includes a transformer housing 1 and an oil conservator 3 fixed to the transformer housing 1 by a bracket 2. It also includes an oil distribution block 4, an oil inlet pipe 5, an oil outlet pipe 6, a first check valve 7 and a second check valve 8. An oil outlet hole 9 is fixed on the top wall of the transformer housing.

[0033] The oil distribution block is provided with a main oil passage 10 and an oil inlet passage 11 and an oil outlet passage 12 that are connected to the main oil passage 10. The main oil passage is connected to the oil outlet hole.

[0034] One end of the oil inlet pipe is connected to the oil inlet channel, and the other end is connected to the bottom of the internal cavity of the transformer casing;

[0035] One end of the oil outlet pipe is connected to the oil outlet channel, and the other end is connected to the upper part of the internal cavity of the transformer casing.

[0036] The first check valve is connected to the oil inlet passage on one side of the oil distribution block and is used to control the opening and closing of the oil inlet passage;

[0037] The second check valve is connected to the oil outlet passage on one side of the oil distribution block and is used to control the opening and closing of the oil outlet passage.

[0038] In the above technical solution, a completely new oil circulation system is constructed by setting up oil distribution blocks, oil inlet pipes, and oil outlet pipes. Within the oil distribution blocks, the main oil passage, oil inlet passage, and oil outlet passage are interconnected. The main oil passage is connected to the oil outlet hole on the top wall of the transformer casing. The oil inlet pipe connects the bottom of the internal cavity of the transformer casing to the oil inlet passage, and the oil outlet pipe connects the oil outlet passage to the upper part of the internal cavity of the transformer casing, forming an oil circulation path. A first check valve and a second check valve control the opening and closing of the oil inlet and oil outlet passages, respectively, ensuring unidirectional oil flow.

[0039] This application abandons the single oil circuit connection method and adopts a dual oil pipe to separate the oil inlet and outlet points. This can extend the oil inlet and outlet path, realize the full circulation and alternation of oil in the oil conservator within the transformer body, improve oil utilization, effectively solve the problem of poor oil circulation, and enhance the cooling and insulation performance of the transformer.

[0040] Specifically, the oil distribution block is detachably fixed to the top of the transformer housing by bolts 13, which protrude from the inner wall of the oil conservator and connect to the oil distribution block.

[0041] In this embodiment, the oil distribution block is detachably fixed to the top of the transformer casing with bolts, and the bolts protrude from the inner wall of the oil conservator and connect to the oil distribution block. This connection method places the bolts inside the oil conservator to avoid unauthorized disassembly, and maintenance holes are provided on the outer wall of the oil conservator to allow for the disassembly and assembly of its internal components.

[0042] Specifically, a filter cover 14 for covering the oil outlet is provided on the inner wall of the oil conservator at the oil outlet, and the filter cover 14 is fixed to the oil conservator by the aforementioned bolts 13.

[0043] In this embodiment, a filter cover is installed on the inner wall of the oil conservator at the oil outlet, and the filter cover is fixed to the oil conservator using bolts connecting the oil separator. The filter cover can perform preliminary filtration of the oil entering the oil conservator, intercepting impurities in the oil. This prevents impurities from entering the oil conservator through the oil outlet, avoiding the accumulation of impurities inside the oil conservator and affecting its normal function. The bolt connection method simplifies the installation process of the filter cover and facilitates subsequent cleaning and replacement of the filter cover, ensuring the cleanliness of the oil and extending the service life of the transformer.

[0044] Specifically, mounting blocks 15 are provided on the two side walls inside the oil conservator, and filter plates 16 are connected between the mounting blocks 15.

[0045] In this embodiment, mounting blocks are provided on both sides of the inner sidewall of the oil conservator, and filter plates are connected through the mounting blocks. The filter plates have large filter holes, which can prevent impurities from floating back to the upper layer to a certain extent after they settle to the bottom of the oil conservator.

[0046] Specifically, the mounting block is provided with a "T"-shaped connecting groove 17, and the filter plate is provided with "T"-shaped connecting ends 18 at both ends to connect with the "T"-shaped connecting groove 17.

[0047] In this embodiment, a "T"-shaped connecting groove is provided on the mounting block, and matching "T"-shaped connecting ends are provided at both ends of the filter plate. The filter plate and the mounting block can be quickly installed and fixed through the cooperation of the "T"-shaped structure.

[0048] Specifically, the filter plate has a pore size of 0.5-3mm.

[0049] Specifically, the filter pore diameter of the filter cover is 0.05-0.25mm.

[0050] In this embodiment, the filter pore diameter of the filter cover is set to 0.05-0.25mm, which is smaller than that of the filter plate, so as to perform finer filtration of the oil entering the oil tank and intercept small particulate impurities.

[0051] Please note to 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, comprising a transformer casing and an oil conservator fixed to the transformer casing by a bracket, characterized in that: It also includes an oil distribution block, an oil inlet pipe, an oil outlet pipe, a first check valve, and a second check valve. An oil outlet hole is fixed on the top wall of the transformer casing. The oil distribution block is provided with a main oil passage and an inlet oil passage and an outlet oil passage that are connected to the main oil passage. The main oil passage is connected to the outlet hole. One end of the oil inlet pipe is connected to the oil inlet channel, and the other end is connected to the bottom of the internal cavity of the transformer casing; One end of the oil outlet pipe is connected to the oil outlet channel, and the other end is connected to the upper part of the internal cavity of the transformer casing. The first check valve is connected to the oil inlet passage on one side of the oil distribution block and is used to control the opening and closing of the oil inlet passage; The second check valve is connected to the oil outlet passage on one side of the oil distribution block and is used to control the opening and closing of the oil outlet passage.

2. The oil-immersed transformer according to claim 1, characterized in that: The oil separator is detachably fixed to the top of the transformer housing by bolts, which pass through the inner wall of the oil conservator and connect to the oil separator.

3. The oil-immersed transformer according to claim 2, characterized in that: A filter cover is provided on the inner wall of the oil conservator at the oil outlet, and the filter cover is fixed to the oil conservator by the aforementioned bolts.

4. The oil-immersed transformer according to claim 1, characterized in that: Mounting blocks are provided on both side walls inside the oil conservator, and filter plates are connected between the mounting blocks.

5. The oil-immersed transformer according to claim 4, characterized in that: The mounting block is provided with a "T"-shaped connecting groove, and the filter plate is provided with "T"-shaped connecting ends at both ends to connect with the "T"-shaped connecting groove.

6. The oil-immersed transformer according to claim 4, characterized in that: The filter plate has a pore size of 0.5-3mm.

7. The oil-immersed transformer according to claim 3, characterized in that: The filter pore diameter of the filter cover is 0.05-0.25mm.

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