A fully sealed autotransformer

Abstract

The present invention discloses a fully sealed autotransformer, comprising a transformer body, a radiator, a bushing mounting base, a plurality of pluggable bushings fixed to the bushing mounting base, a protective device box, a wiring device, and a protective box; the bushing mounting base and the protective device box are both fixed to the front outer wall of the oil tank; the bushing mounting base, the pluggable bushings, and the protective device box are arranged within the protective box; a grid support plate is fixed to the upper end of the inner wall of the oil tank via a bracket support plate; a capsule is placed on the grid support plate; when the transformer oil volume is at its minimum, 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 air inlet is provided in the center of the upper end wall of the capsule, to which an air inlet pipe is sealed; the air inlet pipe is connected to an air guide pipe. The present invention has a low overall height, a small overall volume, a compact structure, simple external wiring, and good cleanliness, and can meet the needs of special areas with limited space, such as tunnels along railways and underground.

Description

Technical Field

[0001] The invention belongs to the field of transformer manufacturing and relates to a fully sealed autotransformer. Background Art

[0002] At present, autotransformers are equipped with external oil conservators to ensure compensation for oil volume changes caused by temperature changes. The oil conservator and bushing are installed on the top of the autotransformer. The overall size of the autotransformer is relatively large, and the external wiring is relatively complex, making it difficult to operate 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 provide a fully sealed autotransformer with low overall height, small overall volume, compact structure, simple external wiring, good cleanliness, and can meet the needs of special areas with limited space such as tunnels along railways and underground.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: a fully sealed autotransformer, comprising a transformer body, a radiator, a bushing mounting base, a plurality of pluggable bushings, a protection device box, a wiring device, and a protection box provided with a detection door; the protection box is sealed and fixed to the front outer wall of the oil tank, and the radiator is fixed to the rear outer wall of the oil tank; the bushing mounting base and the protection device box are both fixed to the front outer wall of the oil tank, and the pluggable bushings are fixed to the bushing mounting base; the bushing mounting base, the pluggable bushings, and the protection device box are arranged in the protection box; and the wiring device is fixed to the lower portion of the protection box;

[0005] The transformer body comprises an oil tank, a device body, a box cover, a capsule, a grid support plate, a bracket support plate and an oil level gauge; the device body is fixed in the oil tank, the oil tank is filled with transformer oil, and the box cover is fixed to the upper end face of the oil tank; the bracket support plate is fixed to the upper end portion of the inner wall of the 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 face is connected to the bottom face of the box cover by a connector, and 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 face of the grid support plate; the capsule is filled with 1 atmospheres of air. When the volume of transformer oil is the smallest, 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 on the side wall of the oil tank near the upper end of the mesh 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 box cover. The air inlet pipe is connected to the air guide pipe, and the air guide pipe is connected to the desiccant. The desiccant has an air inlet hole connected to the atmosphere.

[0006] Further preferably, the side surface of the capsule is a rounded strip, and the upper and lower end surfaces are rounded rectangles.

[0007] 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.

[0008] Further preferably, the air inlet pipe is a connecting flange.

[0009] The present invention arranges a capsule in a transformer main body 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 the smallest. At this time, the bottom surface of the grid support plate contacts the transformer oil, and the capsule contacts the grid support plate; when the temperature rises, the transformer oil expands and the volume increases. The transformer oil enters the upper cavity of the oil tank through the grid 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 the volume decreases, 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 fills back into the capsule until the pressure inside and outside the capsule is balanced, and the capsule no longer fills back into air. Only when the temperature drops again, the capsule will be filled back into air again. In short, after eliminating the external oil storage cabinet of the transformer, the present invention can still absorb the changes in the volume of the transformer oil caused by temperature changes to ensure compensation. The use of the built-in oil storage device integrates the function of the oil storage device with the transformer body, reduces the overall height of the transformer, and reduces the overall volume of the transformer. It also has a simple, compact and reasonable structure. In addition, the present invention uses multiple plug-in bushings for wiring with the outside, which simplifies the external wiring, makes the overall structure of the autotransformer more compact, and avoids problems such as short circuits that often occur in the circuit due to the complexity of the wiring; the setting of the protection box fully encloses the bushing mounting seat, multiple plug-in bushings and the protection device box, reduces the contact between these devices and the outside, is cleaner, reduces the occurrence of short circuits, and extends the service life. The present invention can be well applied to special areas with limited space such as tunnels along railways and underground. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0011] Figure 2 This is the main view of the present invention after removing the protective box

[0012] Figure 3 Schematic diagram of the internal structure of the transformer body in the present invention;

[0013] Figure 4 This is a front view of the capsule of the present invention;

[0014] Figure 51 is a top view of the capsule of the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the accompanying drawings and specific implementations.

[0016] like Figures 1 to 5 As shown, this embodiment includes a transformer body, a radiator 4, a bushing mounting base 6, multiple (three in this embodiment) pluggable bushings 5, a protective device box 11, a wiring device 12, and a protective box 7 equipped with a detection door. The protective box 7 is sealed and fixed to the front outer wall of the oil tank 2, while the radiator 4 is fixed to the rear outer wall of the oil tank. The bushing mounting base 5 and the protective device box 11 are both fixed to the front outer wall of the oil tank 2, and the pluggable bushings 5 ​​are fixed to the bushing mounting base 6. The bushing mounting base 6, the pluggable bushings 5, and the protective device box 11 are disposed within the protective box 7. The wiring device 12 is fixed to the lower portion of the protective box 7. The transformer body includes the oil tank 2, the transformer body 3, the cover 1, the bladder 8, the grid support plate 9, the bracket support plate 10, and the oil level gauge 15. The transformer body 3 is fixed within the oil tank 2, which contains transformer oil. The cover 1 is fixed to the upper end surface of the oil tank 2. Bracket support plate 10 is fixed to the upper end of the inner wall of the oil tank, and the outer edge of mesh support plate 9 is fixed to bracket support plate 10. Capsule 8 is placed on mesh support plate 9, its upper end surface connected to the bottom surface of tank cover 1 by a connector. An oil level gauge 15, connected to the oil tank, is sealed and fixed to the side wall of oil tank 2 near the upper end of mesh support plate 9. Capsule 8 is filled with air at 1 atmosphere of pressure. When the transformer oil volume is at its lowest, the bottom surface of mesh support plate 9 contacts the transformer oil, and capsule 8 contacts mesh support plate 9, filling oil tank 2 above the transformer oil with nitrogen. An oil level gauge 15, connected to oil tank 2, is sealed and fixed to the side wall of oil tank 2 near the upper end of mesh support plate 4. An air inlet is opened in the center of the upper end wall of capsule 8, and an air inlet pipe 18 is sealed and mounted on the air inlet. An air inlet pipe 18 seals and passes through the center hole of the lid 1. It is connected to the air duct 13, which in turn connects to the desiccant 14. The desiccant 14 has an air inlet hole that communicates with the atmosphere. Preferably, the side surfaces of the capsule 8 are elongated and rounded, with the upper and lower end surfaces being rectangular and rounded. Preferably, the connector includes a lifting ring 17 integral with the upper end surface of the capsule 8 and a hook 17 integrally fixed to the lower end surface of the lid 1 for use with the lifting ring 16. Preferably, the air inlet pipe 18 is a connecting flange.

[0017] 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. A fully sealed autotransformer, comprising a transformer body, a radiator, a protection device box and a wiring device; characterized in that: It also includes a sleeve mounting seat, multiple plug-in sleeves and a protection box provided with a detection door; the protection box is sealed and fixed to the front outer wall of the fuel tank, and the radiator is fixed to the rear outer wall of the fuel tank; the sleeve mounting seat and the protection device box are both fixed to the front outer wall of the fuel tank, and the plug-in sleeves are fixed to the sleeve mounting seat; the sleeve mounting seat, the plug-in sleeves and the protection device box are arranged in the protection box; the wiring device is fixed to the lower part of the protection box; The transformer body comprises an oil tank, a device body, a box cover, a capsule, a grid support plate, a bracket support plate and an oil level gauge; the device body is fixed in the oil tank, the oil tank is filled with transformer oil, and the box cover is fixed to the upper end face of the oil tank; the bracket support plate is fixed to the upper end portion of the inner wall of the 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 face is connected to the bottom face of the box cover by a connector, and 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 face of the grid support plate; the capsule is filled with 1 atmospheres of air. When the volume of transformer oil is the smallest, 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 on the side wall of the oil tank near the upper end of the mesh 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 box cover. The air inlet pipe is connected to the air guide pipe, and the air guide pipe is connected to the desiccant. The desiccant has an air inlet hole connected to the atmosphere.

2. The fully sealed autotransformer 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 fully sealed autotransformer 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 fully sealed autotransformer according to claim 3, characterized in that: The air inlet is a connected flange.

5. The fully sealed autotransformer according to claim 1 or 2, characterized in that: The air inlet is a connected flange.

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