Oil storage device for transformer

Abstract

The present invention discloses an oil storage device for a transformer. A bracket support plate is fixed to the upper end of the inner wall of the transformer oil tank, and the outer edge of a mesh support plate is fixed to the bracket support plate. A capsule is placed on the mesh support plate, and its upper end surface is connected to the bottom surface of the transformer tank cover by a connector. The capsule is filled with air at 1 atmosphere of pressure. When the transformer oil volume is at its lowest, the bottom surface of the mesh support plate contacts the transformer oil, the capsule contacts the mesh support plate, and the oil tank above the transformer oil is filled with nitrogen. An oil level gauge connected to the oil tank is sealed and fixed to the side wall of the oil tank near the upper end surface of the mesh support plate. An air inlet is sealed and mounted with an air inlet pipe at the center of the upper end wall of the capsule. The air inlet pipe is sealed and extends through the center hole of the transformer tank cover, then connects to an air duct, which is then connected to a desiccant having an air inlet hole. The present invention integrates the functions of the oil storage cabinet with the transformer body, reducing the overall height of the transformer, resulting in a small size, simple, compact, and reasonable structure.

Description

Technical Field

[0001] The invention belongs to the field of transformer manufacturing and relates to an oil storage device for a transformer. Background Art

[0002] At present, oil-immersed transformers must be equipped with external oil conservators to compensate for changes in the transformer oil volume caused by temperature changes. However, the oil conservator will increase the overall height of the transformer and make the overall volume large, making it difficult to use in special areas with limited space, such as tunnels along railways and underground. Summary of the Invention

[0003] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art and to provide an oil storage device for a transformer that can absorb and compensate for changes in the volume of transformer oil caused by temperature changes. The use of this oil storage device reduces the overall height of the transformer, the overall volume becomes smaller, and the structure is simple, compact and reasonable.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: an oil storage device for a transformer, comprising a capsule, a grid support plate, a bracket support plate and an oil level gauge; the bracket support plate is fixed to the upper end portion of the inner wall of the transformer oil tank, and the outer edge of the grid support plate is fixed to the bracket support plate; the capsule is placed on the grid support plate, and its upper end surface is connected to the bottom surface of the transformer box cover by a connecting piece; the capsule is filled with air at 1 atmosphere of pressure, and when the volume of the transformer oil is the smallest, the bottom surface of the grid support plate contacts the transformer oil, the capsule contacts the grid support plate, and the oil tank above the transformer oil is filled with nitrogen; an oil level gauge connected to the oil tank is sealed and fixed on the side wall of the oil tank near the upper end surface of the grid support plate; an air inlet is opened in the center of the upper end wall of the capsule, and an air inlet pipe is sealed and installed on the air inlet; the air inlet pipe seals and passes through the center hole of the transformer box cover, the air inlet pipe is connected to the air guide pipe, and the air guide pipe is connected to the desiccant, and the desiccant has an air inlet connected to the atmosphere.

[0005] Further preferably, the side surface of the capsule is a rounded strip, and the upper and lower end surfaces are rounded rectangles.

[0006] Further preferably, the connecting member includes a hanging ring integral with the upper end surface of the capsule and a hanging hook fixed integrally on the lower end surface of the box cover and used in conjunction with the hanging ring.

[0007] Further preferably, the air inlet pipe is a connecting flange.

[0008] The present invention arranges a capsule in an oil tank, and the oil tank at the upper end of the transformer oil is filled with nitrogen. When the temperature is lowest, the volume of the transformer oil is smallest. At this time, the bottom surface of the mesh support plate contacts the transformer oil, and the capsule contacts the mesh support plate. When the temperature rises, the transformer oil expands and increases in volume. The transformer oil enters the upper cavity of the oil tank through the mesh support plate, lifts the capsule, the volume of the nitrogen decreases, the air pressure outside the capsule increases, the capsule is squeezed, and the capsule is connected to the atmosphere. The air in the capsule is discharged, the volume of the capsule decreases, the volume of the nitrogen gradually increases, and the pressure gradually decreases until the pressure inside and outside the capsule is balanced, and the capsule no longer discharges air. Only when the temperature rises again, the capsule will discharge air again. When the temperature drops, the transformer oil contracts and decreases in volume, the volume of the nitrogen increases, the pressure outside the capsule decreases, the air inside begins to expand, resulting in negative pressure, and the air in the atmosphere automatically refills the capsule until the pressure inside and outside the capsule is balanced, and the capsule no longer refills with air. Only when the temperature drops further, the capsule will be refilled with air again. In summary, while eliminating the need for an external transformer oil conservator, the present invention still ensures compensation for changes in transformer oil volume due to temperature fluctuations. The use of an internal oil reservoir integrates its functionality with the transformer itself, reducing the overall height and volume of the transformer. Its simple, compact, and rational structure makes it ideally suited for use in limited space, such as in railway tunnels and underground locations. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Schematic diagram of the internal structure of the present invention;

[0010] Figure 2 This is a front view of the capsule of the present invention;

[0011] Figure 3 1 is a top view of the capsule of the present invention. DETAILED DESCRIPTION

[0012] The present invention will be further described below with reference to the accompanying drawings and specific implementations.

[0013] like Figure 1 、 Figure 2 and Figure 3As shown, this embodiment includes a capsule 3, a mesh support plate 4, a bracket support plate 5, and an oil level gauge 11. The bracket support plate 5 is fixed to the upper end of the inner wall of the transformer oil tank 2, and the outer edge of the mesh support plate 4 is fixed to the bracket support plate 5. The capsule 3 is placed on the mesh support plate 4, and its upper end surface is connected to the bottom surface of the transformer tank cover 1 by a connector. The capsule 3 is filled with air at 1 atmosphere of pressure. When the transformer oil volume is minimum, the bottom surface of the mesh support plate 4 contacts the transformer oil, the capsule 3 contacts the mesh support plate 4, and the oil tank 2 above the transformer oil is filled with nitrogen. An oil level gauge 11 connected to the oil tank 2 is sealed and fixed to the side wall of the oil tank 2 near the upper end surface of the mesh support plate 4. An air inlet is opened in the center of the upper end wall of the capsule 3, and an air inlet pipe 7 is sealed and mounted on the air inlet. The air inlet pipe 7 seals and passes through the center hole of the transformer cover 1. It is connected to an air duct 8, which in turn connects to a desiccant 9. The desiccant 9 has an air inlet hole that connects to the atmosphere. Preferably, the side surface of the capsule 3 is a long, rounded strip, with rounded rectangular upper and lower end surfaces. Preferably, the connector includes a lifting ring 6 integral with the upper end surface of the capsule 3 and a hook 10 integrally fixed to the lower end surface of the fuel tank cover 1 for use with the lifting ring 6. Preferably, the air inlet pipe 7 is a connecting flange.

[0014] Of course, the present invention has many other embodiments. Without violating the spirit and essence of the present invention, those skilled in the art may make corresponding changes and modifications based on the present invention. However, these corresponding changes and modifications should be regarded as improvements of equivalent technologies and fall within the scope of protection of the claims of the present invention.

Claims

1. An oil storage device for a transformer, characterized in that: It includes a capsule, a grid support plate, a bracket support plate and an oil level gauge; the bracket support plate is fixed to the upper end of the inner wall of the transformer oil tank, and the outer edge of the grid support plate is fixed to the bracket support plate; the capsule is placed on the grid support plate, and its upper end surface is connected to the bottom surface of the transformer box cover by a connector; the capsule is filled with air at 1 atmosphere of pressure, and when the volume of the transformer oil is the smallest, the bottom surface of the grid support plate contacts the transformer oil, the capsule contacts the grid support plate, and the oil tank above the transformer oil is filled with nitrogen; an oil level gauge connected to the oil tank is sealed and fixed on the side wall of the oil tank near the upper end surface of the grid support plate; an air inlet is opened in the center of the upper end wall of the capsule, and an air inlet pipe is sealed and installed on the air inlet; the air inlet pipe seals and passes through the center hole of the transformer box cover, the air inlet pipe is connected to the air guide pipe, and the air guide pipe is connected to the desiccant, and the desiccant has an air inlet connected to the atmosphere.

2. The transformer oil storage device according to claim 1, characterized in that: The side surface of the capsule is a rounded strip, and the upper and lower end surfaces are rounded rectangles.

3. The transformer oil storage device according to claim 1 or 2, characterized in that: The connecting piece comprises a lifting ring which is integrated with the upper end surface of the capsule and a lifting hook which is fixed on the lower end surface of the fuel tank cover and is used in conjunction with the lifting ring.

4. The transformer oil storage device according to claim 3, characterized in that: The air inlet pipe is a connecting flange.

5. The transformer oil storage device according to claim 1 or 2, characterized in that: The air inlet pipe is a connecting flange.

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