Fully-sealed oil-immersed high-capacity power transformer

Abstract

The utility model discloses a full-sealed oil-immersed high-capacity power transformer, which relates to the technical field of transformers and comprises an oil tank, a tank cover is mounted on the top surface of the oil tank, cooling components are assembled on two sides of the top surface of the tank cover, and an oil pump is mounted above the tank cover. The louver adopts a gap type structure and a stepped inclined shape, heat in the radiating fins can be smoothly radiated outwards through gaps among the gap type structures by the aid of the gap type structure, and the stepped inclined shape guides an air flowing path, so that the heat in the radiating fins can be radiated outwards by the aid of the gap type structure regardless of blowing of external natural wind. The air can smoothly penetrate through the protective cover along the inclination angle of the shutter and fully flow through the heat dissipation fins when the transformer is in a power-off state or is in air convection caused by heat dissipation of the transformer, and meanwhile, most dust is effectively blocked through the shutter, so that air circulation can be guaranteed, and most dust can be blocked.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically a fully sealed oil-immersed large-capacity power transformer. Background Technology

[0002] Oil-immersed transformers use transformer oil as the insulating and cooling medium. Transformer oil is characterized by its abundant reserves, excellent performance, and low price. The vast majority of power transformers still use transformer oil as the insulating and cooling medium.

[0003] The applicant discovered through a search that a Chinese patent discloses "A Fully Sealed Oil-Immersed Large-Capacity Power Transformer," with publication (announcement) number "CN212136179U." The oil tank is sealed by a cover located above it. An oil inlet is located below the oil tank. The upper side of the oil tank is connected to the oil inlet via a circulating oil pipe and a condenser pipe. The condenser pipe is seamlessly connected to the circulating oil pipe and is spiral-shaped. The condenser pipe is surrounded by a condensate tank, which is supplied with circulating water from a storage tank via a circulating water pipe. This utility model discloses a fully sealed oil-immersed large-capacity power transformer that circulates and cools the transformer oil during operation, reducing its temperature.

[0004] During the heat dissipation process of transformers, a large number of impurities are generated in the transformer oil due to metal debris and particles from the aging and shedding of insulation materials produced by the long-term operation of the transformer. As a result, the impurities will block the oil passages during the circulating cooling process of the transformer oil, resulting in poor circulation of the transformer oil and thus reducing the heat dissipation efficiency. At the same time, dust is easily accumulated on the surface of the heat dissipation fins, which also reduces the heat dissipation efficiency. To address this, we propose a fully sealed oil-immersed large-capacity power transformer. Utility Model Content

[0005] The purpose of this utility model is to provide a fully sealed oil-immersed large-capacity power transformer.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fully sealed oil-immersed large-capacity power transformer, including an oil tank, a tank cover installed on the top surface of the oil tank, and cooling components mounted on both sides of the top surface of the tank cover. The cooling components include an oil pump, an oil extraction pipe, an oil passage pipe, a filter, a cooler, a fan, and a return pipe. The oil pump is installed above the tank cover, the oil extraction pipe extends through the tank cover to the inner wall of the oil tank, the oil passage pipe is connected to the cooler through the filter, a fan is mounted above the cooler, and the return pipe is connected to one side of the cooler.

[0007] As a further embodiment of this utility model: an insulating sleeve is provided on the top surface of the box cover, and three sets of the insulating sleeve are provided. An oil level gauge is provided on one side of the insulating sleeve.

[0008] As a further embodiment of this utility model: the oil tank is provided with heat dissipation fins on the outside, and there are several heat dissipation fins. The heat dissipation fins are equipped with a protective cover on the outside, and the protective cover is provided with louvers inside. The louvers are in a stepped inclined shape and the louvers are in a gap structure.

[0009] As a further embodiment of this utility model: a controller is installed on one side of the front upper part of the oil tank.

[0010] As a further embodiment of this utility model: the inner wall of the oil tank is provided with an iron core, and the iron core is provided with windings, and the windings are provided in three sets.

[0011] As a further embodiment of this invention, a temperature sensor is installed on one side above the iron core.

[0012] Compared with the prior art, the beneficial effects of this utility model by adopting the above technical solution are as follows:

[0013] 1. This utility model uses an oil pump to extract transformer oil from the oil tank. The transformer oil rises along the oil extraction pipe and then enters the oil passage pipe. Before entering the cooler, the transformer oil passes through a filter, which effectively intercepts various impurities in the transformer oil. The filtered transformer oil flows into the cooler. When the transformer oil flows in it, it exchanges heat with the cooling medium. At the same time, the fan installed above the cooler starts synchronously. The fan rotates at high speed, which causes the air around the cooler to flow rapidly. Hot air is quickly carried away and cold air is replenished in time, which greatly accelerates the heat exchange rate and allows the transformer oil to be fully cooled in a shorter time. The cooled transformer oil flows back to the oil tank through the return pipe, thereby realizing the cooling cycle of the transformer oil.

[0014] 2. This utility model uses a protective cover installed on the outside of the heat dissipation fins. The louvers adopt a gap structure and a stepped inclined shape. The gap structure allows the heat inside the heat dissipation fins to be dissipated smoothly outward through the gaps, while the stepped inclined shape guides the airflow path. Therefore, whether it is the blowing of external natural wind or the air convection caused by the heat dissipation of the transformer itself, the air can smoothly pass through the protective cover along the inclined angle of the louvers and fully flow through the heat dissipation fins. At the same time, the louvers effectively block most of the dust, so as to ensure air circulation while blocking most of the dust.

[0015] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0016] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0017] Figure 2 This is a frontal cross-sectional view of an embodiment of the present utility model;

[0018] Figure 3 This is a front view schematic diagram of an embodiment of this utility model;

[0019] Figure 4 This is a schematic diagram of the protective cover in an embodiment of this utility model.

[0020] In the diagram: 1. Oil tank; 101. Heat dissipation fins; 2. Protective cover; 201. Louver; 3. Tank cover; 4. Cooling assembly; 401. Oil pump; 402. Oil extraction pipe; 403. Oil passage pipe; 404. Filter; 405. Cooler; 406. Fan; 407. Return pipe; 5. Insulating sleeve; 6. Oil level gauge; 7. Controller; 8. Iron core; 9. Winding; 10. Temperature sensor. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that the description of these embodiments is for the purpose of helping to understand this utility model, but does not constitute a limitation on this utility model.

[0022] Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0023] Please see the appendix Figure 1 - Appendix Figure 4 This utility model discloses a fully sealed oil-immersed large-capacity power transformer, including an oil tank 1, with a tank cover 3 installed on the top surface of the oil tank 1. (The rest of the text appears to be a continuation of the previous sentence and can be left as is.) Figure 1 , Figure 2 , Figure 3As shown, cooling components 4 are mounted on both sides of the top surface of the tank cover 3. The cooling components 4 include an oil pump 401, an oil extraction pipe 402, an oil passage pipe 403, a filter 404, a cooler 405, a fan 406, and a return pipe 407. The oil pump 401 is installed above the tank cover 3. The oil extraction pipe 402 extends through the tank cover 3 to the inner wall of the oil tank 1. The oil passage pipe 403 is connected to the cooler 405 through the filter 404. A fan 406 is mounted above the cooler 405. The return pipe 407 is connected to one side of the cooler 405. The oil pump 401 draws transformer oil from the oil tank 1. The transformer oil rises along the oil extraction pipe 402 and then enters the oil passage pipe 403. Before entering the cooler 405, the transformer oil passes through the filter 404, which effectively intercepts various impurities in the transformer oil. After filtration, the transformer oil flows into the cooler 405. As the transformer oil flows through it, it exchanges heat with the cooling medium. At the same time, the fan 406 installed above the cooler 405 starts synchronously. The fan 406 rotates at high speed, causing the air around the cooler 405 to flow rapidly. Hot air is quickly carried away and cold air is replenished in time, which greatly accelerates the rate of heat exchange, allowing the transformer oil to be fully cooled in a shorter time. The cooled transformer oil flows back to the inner ring of the oil tank 1 through the return pipe 407.

[0024] In Example 1, an insulating sleeve 5 is provided on the top surface of the box cover 3, and three sets of insulating sleeves 5 are provided. An oil level gauge 6 is provided on one side of the insulating sleeve 5.

[0025] Specifically, the insulating bushing 5 ensures the insulation performance between the winding 9 and the oil tank 1 as well as the external environment, preventing leakage and breakdown. The oil level gauge 6 on one side of the insulating bushing 5 is used to monitor the level of transformer oil in the oil tank 1. The oil level gauge 6 can visually display the oil level in the oil tank 1, and the staff can understand the amount of transformer oil in a timely manner by observing the oil level gauge 6.

[0026] In embodiment 2, the oil tank 1 is provided with heat dissipation fins 101 on the outside, and there are several heat dissipation fins 101. A protective cover 2 is installed on the outside of the heat dissipation fins 101, and a louver 201 is provided inside the protective cover 2. The louver 201 is in a stepped inclined shape and the louver 201 is in a gap structure.

[0027] Specifically, the contact area between the oil tank 1 and the outside air is increased by several heat dissipation fins 101 on the outside of the oil tank 1. The heat of the transformer oil is conducted to the heat dissipation fins 101 through the inner wall of the oil tank 1. The heat is then dissipated into the surrounding air through the heat dissipation fins 101. Furthermore, the louvers 201 inside the protective cover 2 adopt a gap structure and a stepped inclined shape. The gap structure allows the heat inside the heat dissipation fins 101 to be dissipated smoothly through the gaps, while the stepped inclined shape guides the airflow path. Therefore, whether it is the blowing of the outside natural wind or the air convection caused by the heat dissipation of the transformer itself, the air can smoothly pass through the protective cover 2 along the inclined angle of the louvers 201 and fully flow through the heat dissipation fins 101. At the same time, the louvers 201 effectively block most of the dust, thus ensuring both air circulation and blocking most of the dust.

[0028] In embodiment three, the inner wall of the oil tank 1 is provided with an iron core 8, and the iron core 8 is provided with a winding 9, and the winding 9 is provided with three sets.

[0029] Specifically, through the iron core 8 and winding 9 on the inner wall of the oil tank 1, when alternating current is passed into the winding 9, an alternating magnetic field will be rapidly generated around the winding 9. Due to the high permeability of the iron core 8, the alternating magnetic field will be efficiently conducted inside the iron core 8 and form a closed magnetic circuit.

[0030] Working principle:

[0031] First, during the operation of the transformer, the transformer oil absorbs the heat generated by the iron core 8 and winding 9 and its temperature rises. This heat is gradually conducted to the heat dissipation fins 101 through the inner wall of the oil tank 1. The heat dissipation fins 101, with their large surface area, dissipate the heat to the surrounding air, achieving initial heat dissipation and cooling. The louvers 201 installed in the outer protective cover 2 of the heat dissipation fins 101 allow the heat to flow out through the gaps between the louvers 201. At the same time, the louvers 201 prevent external dust from contacting the heat dissipation fins 101, thus effectively preventing the accumulation of dust on the heat dissipation fins 101.

[0032] Temperature sensor 10 monitors the temperature inside oil tank 1 in real time and transmits the monitored signal to controller 7. Once the temperature inside oil tank 1 reaches the preset start threshold of controller 7, controller 7 immediately starts oil pump 401. At this time, transformer oil in oil tank 1 enters filter 404 and cooler 405 through oil extraction pipe 402 and oil passage pipe 403. Filter 404 filters impurities in transformer oil, and the filtered transformer oil flows into cooler 405 and comes into contact with the internal cooling medium. At the same time, the start of fan 406 improves the cooling effect of cooler 405 on transformer oil. Subsequently, transformer oil flows back into oil tank 1 through return pipe 407. Thus, the entire process ends.

[0033] The terms "front," "back," "left," "right," "top," and "bottom" all refer to the figures in the accompanying drawings. Figure 1 Based on the perspective of the observer, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 limiting the scope of protection of this utility model.

[0035] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments.

[0036] For those skilled in the art, various changes, modifications, substitutions, and alterations to these embodiments without departing from the principles and spirit of this utility model will still fall within the protection scope of this utility model.

Claims

1. A fully sealed oil-immersed large-capacity power transformer, comprising an oil tank (1), wherein a tank cover (3) is installed on the top surface of the oil tank (1), characterized in that: Cooling components (4) are mounted on both sides of the top surface of the cover (3). The cooling components (4) include an oil pump (401), an oil extraction pipe (402), an oil passage pipe (403), a filter (404), a cooler (405), a fan (406), and a return pipe (407). The oil pump (401) is installed above the cover (3). The oil extraction pipe (402) extends through the cover (3) to the inner wall of the oil tank (1). The oil passage pipe (403) is connected to the cooler (405) through the filter (404). A fan (406) is mounted above the cooler (405). The return pipe (407) is connected to one side of the cooler (405).

2. The fully sealed oil-immersed large-capacity power transformer according to claim 1, characterized in that: An insulating sleeve (5) is provided on the top surface of the box cover (3). Three sets of the insulating sleeve (5) are provided. An oil level gauge (6) is provided on one side of the insulating sleeve (5).

3. A fully sealed oil-immersed large-capacity power transformer according to claim 1, characterized in that: The oil tank (1) is provided with heat dissipation fins (101) on the outside. There are several heat dissipation fins (101). A protective cover (2) is installed on the outside of the heat dissipation fins (101). A louver (201) is provided inside the protective cover (2). The louver (201) is in a stepped inclined shape and there is a gap between the louvers (201).

4. A fully sealed oil-immersed large-capacity power transformer according to claim 1, characterized in that: A controller (7) is installed on one side of the front of the oil tank (1).

5. A fully sealed oil-immersed large-capacity power transformer according to claim 1, characterized in that: The inner wall of the oil tank (1) is provided with an iron core (8), and the iron core (8) is provided with a winding (9), and the winding (9) is provided with three sets.

6. A fully sealed oil-immersed large-capacity power transformer according to claim 5, characterized in that: A temperature sensor (10) is installed on the upper side of the iron core (8).

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