An oil-immersed transformer

Abstract

The application provides an oil-immersed transformer, which comprises an oil tank body, a transformer body and a heat dissipation device, the oil tank body is made of aluminum alloy material and comprises an oil tank cover plate, an oil tank shell wall, an oil tank bottom plate and two oil tank fixing seats, the transformer body is arranged inside a space surrounded by the oil tank body, the transformer body comprises a planar winding core, a high-voltage coil, a low-voltage coil, an upper clamp and a lower clamp, the upper clamp and the lower clamp are made of aluminum alloy material, the heat dissipation device is fixed to the outer wall of the oil tank shell wall, and the heat dissipation device has the advantages of small density, light weight, strong heat dissipation capacity, non-magnetic conductivity and high mechanical strength, so that the volume of the transformer is reduced, the weight of the transformer is reduced, the heat dissipation effect is good, and the operation state is stable; and the planar winding core structure is adopted, so that the no-load loss and the no-load current are low, the structure is compact and reasonable, and the operation reliability of the product is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power transformer, and particularly relates to an oil-immersed transformer. BACKGROUND

[0002] At present, the oil tank of the common oil-immersed transformer is made of steel material, such as a frame made of shaped steel, a tank wall made of thick steel plate, and a heat radiator made of corrugated sheet or sheet type and in a rectangular structure. The oil tank with such material and shape has poor heat dissipation capacity, and the steel plate can conduct magnetism, which increases the eddy current loss and other additional losses of the transformer, resulting in more deteriorated temperature rise, load loss and other conditions of the transformer, and has the disadvantages of large volume and heavy weight. Moreover, the core is in a lamination structure, and the core used for the small-capacity single-phase oil-immersed transformer has large process loss, and the core is made of more material and has heavy weight due to the angle iron, so that the total weight and volume of the oil-immersed transformer are large, the material cost of the transformer is increased, and the installation and transportation are not convenient. Moreover, the heat dissipation effect of the transformer is poor due to the poor heat conduction capacity of the steel material, and the operation state of the transformer is unreliable. SUMMARY

[0003] The present application aims at overcoming the deficiencies of the prior art, and provides an oil-immersed transformer, which solves the problems of large volume, heavy weight, poor heat dissipation capacity, poor temperature rise loss, inconvenient installation and transportation, and unreliable operation state of the transformer in the prior art.

[0004] In order to achieve the above-mentioned purpose, the present application provides an oil-immersed transformer, which comprises an oil tank body, a transformer body and a heat dissipation device.

[0005] The oil tank body is made of aluminum alloy material and comprises an oil tank cover plate, an oil tank shell wall, an oil tank bottom plate and two oil tank fixing seats. The oil tank shell wall is open at the upper and lower ends, the oil tank bottom plate is fixed to the lower edge of the oil tank shell wall, the shape of the oil tank bottom plate matches the lower end opening of the oil tank shell wall, the oil tank fixing seats are fixed to the lower part of the oil tank bottom plate, the oil tank cover plate is fixed to the upper edge of the oil tank shell wall, the shape of the oil tank cover plate matches the upper end opening of the oil tank shell wall, and the oil tank cover plate is provided with a high-voltage sleeve and a low-voltage sleeve.

[0006] The transformer body is arranged inside the space surrounded by the oil tank body, and the transformer body comprises a planar wound core, a high-voltage coil, a low-voltage coil, an upper clamp and a lower clamp.

[0007] The heat dissipation device is fixed to the outer wall of the oil tank shell wall.

[0008] Further, the aluminum alloy material is a nano-aluminum alloy composite material, which comprises nano-aluminum alloy and carbon nano-particles, and the carbon nano-particles are arranged in parallel to the surface of the nano-aluminum alloy composite material.

[0009] Further, the cross section of the oil tank shell wall is a long circle.

[0010] Further, the planar wound core is continuously wound by silicon steel sheets with different widths.

[0011] Further, the planar wound core comprises an amorphous alloy core and a cladding layer, the cladding layer is arranged on the outer surface of the amorphous alloy core, the shape of the cladding layer is adapted to the shape of the amorphous alloy core, and a magnetically conductive colloidal layer is further arranged between the cladding layer and the amorphous alloy core, and the magnetically conductive colloidal layer is filled between the cladding layer and the amorphous alloy core.

[0012] Further, the heat dissipation device comprises two groups of heat dissipation fins, the heat dissipation fins comprise a heat dissipation bottom plate and a plurality of heat dissipation fins, the heat dissipation fins are fixed side by side on one side of the heat dissipation bottom plate, the other side of the heat dissipation bottom plate is fixed to the vertical side of the oil tank shell wall, and the two groups of heat dissipation fins are oppositely arranged.

[0013] Further, the heat dissipation device further comprises a plurality of phase change heat pipe radiators, the phase change heat pipe radiators comprise a hot end and a cold end, the cold end of the phase change heat pipe radiator is connected to the heat dissipation fin, the hot end of the phase change heat pipe radiator is connected to a heat dissipation block, and the heat dissipation block is provided with corrugated fin-shaped heat dissipation fins.

[0014] Further, the heat dissipation block is correspondingly provided with a heat dissipation fan.

[0015] Further, the heat dissipation device further comprises a plurality of semiconductor heat exchange units, the semiconductor heat exchange units comprise hot ends and cold ends, the cold ends of the semiconductor heat exchange units are connected to the heat dissipation fins, and the hot ends of the semiconductor heat exchange units are connected to a heat dissipation block, and the heat dissipation block is provided with corrugated and tooth-shaped heat dissipation fins.

[0016] Further, the planar wound core is a single-phase three-column core or a three-phase three-column core.

[0017] The present application has the following beneficial effects:

[0018] 1. The oil-immersed transformer is provided, the oil tank body is made of aluminum alloy material, the upper clamp and the lower clamp are also made of aluminum alloy material, the aluminum alloy material is a nano aluminum alloy composite material, and the nano aluminum alloy composite material has the advantages of small density, light weight, strong heat dissipation capacity, non-magnetic property and high mechanical strength, so that the volume of the transformer is reduced, the weight of the transformer is reduced, the heat dissipation effect of the transformer is good, and the operation state of the transformer is stable.

[0019] 2. The oil-immersed transformer is provided, the planar wound core structure is adopted, a coating layer is arranged on the outer surface of the amorphous alloy core, and a magnetic gel layer is filled in the gap between the coating layer and the amorphous alloy core, so that the debris generated due to damage of the amorphous alloy core in the operation process can not pollute the transformer oil, subsequent maintenance is facilitated, and operation reliability is improved.

[0020] 3. The oil-immersed transformer is provided, the heat dissipation device comprises two groups of heat dissipation fins, a phase change heat pipe radiator or a semiconductor heat exchange unit, the heat dissipation fins are tightly attached to the side of the oil tank shell wall, the heat of the transformer oil in the oil tank body is conducted out, the phase change heat pipe radiator or the semiconductor heat exchange unit is used to enhance the heat dissipation capacity, the cold end is connected to the heat dissipation fins, the hot end is connected to a heat dissipation block, and the heat dissipation fins are connected to the heat dissipation block through forced convection heat exchange, so that the heat conduction of the heat dissipation fins is faster, and the heat dissipation effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application is further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Fig. 1 It is a whole structure schematic diagram of the oil-immersed transformer provided by the present application.

[0023] Fig. 2 It is a whole structure schematic diagram of the oil-immersed transformer provided by the present application.

[0024] Fig. 3 It is a sectional view schematic diagram of the planar wound core in the oil-immersed transformer provided by the present application. DETAILED DESCRIPTION

[0025] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0026] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] Embodiment 1:

[0028] Referring to Figs. 1-2 The present embodiment provides an oil-immersed transformer, which is suitable for single-phase distribution transformer, comprising an oil tank body, a transformer body and a heat dissipation device.

[0029] The oil tank body is made of aluminum alloy material, comprising an oil tank cover plate 11, an oil tank shell wall 12, an oil tank bottom plate 13 and two oil tank fixing seats 14. The oil tank shell wall 12 is open at both ends, the oil tank bottom plate 13 is fixed to the lower edge of the oil tank shell wall 12, the shape of the oil tank bottom plate 13 matches the lower end opening of the oil tank shell wall 12, the oil tank fixing seat 14 is fixed to the lower part of the oil tank bottom plate 13, the oil tank cover plate 11 is fixed to the upper edge of the oil tank shell wall 12 by bolts, the shape of the oil tank cover plate 11 matches the upper end opening of the oil tank shell wall 12, and the oil tank cover plate 11 is provided with a high-voltage bushing 15 and a low-voltage bushing 16. The oil tank cover plate 11, the oil tank shell wall 12 and the oil tank bottom plate 13 form a containing space.

[0030] The transformer body is arranged inside the space surrounded by the oil tank body, and comprises a planar wound core 21, a high-voltage coil 22, a low-voltage coil 23, an upper clamp 24 and a lower clamp 25. The low-voltage coil 23 is sleeved outside the planar wound core 21, and the high-voltage coil 22 is sleeved outside the low-voltage coil 23. The upper clamp 24 is arranged at the upper end of the high-voltage coil 22 and the low-voltage coil 23, and the lower clamp 25 is arranged at the lower end of the high-voltage coil 22 and the low-voltage coil 23. The upper clamp 24 and the lower clamp 25 are fixedly connected through a connecting rod 26. The upper clamp 24 and the lower clamp 25 clamp the high-voltage coil 22 and the low-voltage coil 23 from the upper side and the lower side, respectively. The upper clamp 24 and the lower clamp 25 are made of aluminum alloy material. When the upper clamp 24 and the lower clamp 25 are fixed by the connecting rod 26, the planar wound core 21, the high-voltage coil 22 and the low-voltage coil 23 are also fixed as a whole.

[0031] The heat dissipation device is fixed to the outer wall of the oil tank shell wall 12. The heat dissipation device guides the heat of the transformer oil in the oil tank body to the outside, so that the oil tank body is in a stable and reliable temperature state.

[0032] Through material replacement and reasonable structure layout, the oil-immersed transformer has the advantages of small density, light weight, strong heat dissipation capacity, non-magnetic and high mechanical strength, so that the transformer has the characteristics of small volume, light weight, good heat dissipation effect and stable running state.

[0033] In addition, in the embodiment, the planar wound core 21 is a single-phase three-column core. In other embodiments, the planar wound core can be a three-phase three-column core.

[0034] In the embodiment, the aluminum alloy material is a nano-aluminum alloy composite material, which includes nano-aluminum alloy and carbon nano particles. The nano-aluminum alloy composite material is made by compounding carbon nano particles in nano-aluminum alloy. The carbon nano particles are arranged in parallel to the surface of the nano-aluminum alloy composite material. The nano-aluminum alloy composite material has the characteristics of light weight, high strength, good heat conductivity, good electrical conductivity and good processability. The oil tank cover plate 11, the oil tank shell wall 12, the oil tank bottom plate 13, the two oil tank fixing seats 14, the upper clamp 24, the lower clamp 25 and the cooling fins 30 in the heat dissipation device are all made of the material.

[0035] As a preferred mode, the planar wound core is continuously wound by silicon steel sheets with different widths. More specifically, the planar wound core is wound by special winding equipment, and silicon steel sheets with different widths are continuously wound to the required thickness, and then combined. The planar wound core has the characteristics of low no-load loss and no-load current, compact and reasonable structure, and improved product operation reliability.

[0036] Reference Fig. 3As another preferred mode, the planar roll core 21 comprises an amorphous alloy core 211 and a cladding layer 212, the cladding layer 212 is arranged on the outer surface of the amorphous alloy core 211, the shape of the cladding layer 212 is adapted to the shape of the amorphous alloy core 211, and a magnetic conductive colloidal layer 213 is further arranged between the cladding layer 212 and the amorphous alloy core 211, the magnetic conductive colloidal layer 213 is filled between the cladding layer 212 and the amorphous alloy core 211, and the electromagnetic wires of the high-voltage coil 22 and the low-voltage coil 23 are all coated with phenolic epoxy resin, and the cladding layer 212 is also made of nano-aluminum alloy composite material, which has the advantages of high strength, light weight and good strength; wherein the cladding layer 212 is arranged on the outer layer of the amorphous alloy core 211, which provides a relatively independent space for the amorphous alloy core 211, avoids the debris generated by the amorphous alloy core 211 during operation from polluting the transformer oil, facilitates subsequent maintenance, improves operation reliability, and improves the anti-short-circuit capability of the amorphous alloy core 211.

[0037] In the embodiment, the cross section of the oil tank shell wall 12 is a long circle, which is composed of two semicircles and two straight lines, which is more efficient in the use of internal space and saves transformer oil; preferably, the heat dissipation device comprises two groups of heat dissipation fins 30, the heat dissipation fins 30 are one-time formed by molding, the heat dissipation fins 30 comprise a heat dissipation bottom plate and a plurality of heat dissipation fins, the heat dissipation fins are fixed side by side on one side of the heat dissipation bottom plate, and have a comb-shaped structure, the other side of the heat dissipation bottom plate is fixed to the vertical side of the oil tank shell wall 12, that is, the side where the two straight lines in the cross section are located, and the two groups of heat dissipation fins 30 are oppositely arranged, which is beneficial to the heat dissipation of the transformer in the oil tank. In addition, a plurality of heat dissipation ribs are arranged on the inner wall of the oil tank shell wall 12, the heat dissipation ribs are arranged in the circumferential direction of the inner wall of the oil tank shell wall 12, and the plurality of heat dissipation ribs are distributed side by side from top to bottom, which is helpful for the heat conduction between the transformer oil and the oil tank shell wall 12. In addition, according to actual needs, a plurality of groups of heat dissipation fins can be arranged.

[0038] In order to enhance the heat dissipation effect of the heat dissipation device, the following two implementation modes can be adopted in the embodiment.

[0039] As one implementation mode, the heat dissipation device further comprises a plurality of phase change heat pipe radiators, the phase change heat pipe radiator comprises a hot end and a cold end, the cold end of the phase change heat pipe radiator is connected to the heat dissipation fin, and the hot end of the phase change heat pipe radiator is connected to a heat dissipation block, and the heat dissipation block is provided with corrugated and tooth-shaped heat dissipation ribs.

[0040] It should be noted that the phase change heat pipe radiator is internally provided with a phase change substance, and the phase change of gas and liquid is completed in the heat dissipation pipe, wherein the heat on the heat dissipation fin is absorbed at the cold end and is transferred to the hot end, and then heat is released through the heat dissipation block connected to the hot end, so as to realize the transfer of heat, effectively reduce the temperature of the heat dissipation fin, and further reduce the temperature of the transformer oil.

[0041] Preferably, a heat dissipation fan is arranged on the heat dissipation block, and the heat dissipation fan is used to force the heat dissipation fins to dissipate heat, so that the heat dissipation fins dissipate heat more efficiently.

[0042] As another implementation, the heat dissipation device further comprises a plurality of semiconductor heat exchange units, each of the semiconductor heat exchange units comprises a hot end and a cold end, the cold end of each of the semiconductor heat exchange units is connected to the heat dissipation fins, and the hot end of each of the semiconductor heat exchange units is connected to a heat dissipation block, and the heat dissipation block is provided with corrugated and tooth-shaped heat dissipation fins.

[0043] It should be noted that the semiconductor heat exchange units transfer heat at the cold end and the hot end when powered on, and the cold end is used to absorb heat from the heat dissipation fins and transfer the heat to the hot end, and then the heat is dissipated through the heat dissipation block connected to the hot end, so that the heat is transferred, the temperature of the heat dissipation fins is effectively reduced, and the temperature of the transformer oil is further reduced.

[0044] Preferably, a heat dissipation fan is arranged on the heat dissipation block, and the heat dissipation fan is used to force the heat dissipation fins to dissipate heat, so that the heat dissipation fins dissipate heat more efficiently.

[0045] Compared with the prior art, the oil-immersed transformer provided by the application is made of aluminum alloy material, and the upper clamp 24 and the lower clamp 25 are also made of aluminum alloy material, wherein the aluminum alloy material is a nano aluminum alloy composite material, which has the advantages of small density, light weight, strong heat dissipation capacity, non-magnetic, and high mechanical strength, so that the volume of the transformer is reduced, the weight is reduced, the heat dissipation effect is good, and the running state is stable.

[0046] The oil-immersed transformer provided by the application adopts a planar wound core 21 structure, and a cladding layer 212 is arranged on the outer surface of the amorphous alloy core 211, and a magnetic conductive glue layer 213 is filled in the gap between the cladding layer 212 and the amorphous alloy core 211, so that the debris generated by the amorphous alloy core 211 during operation can not pollute the transformer oil, and the subsequent maintenance is facilitated, and the operation reliability is improved.

[0047] The oil-immersed transformer provided by the application comprises two groups of heat dissipation fins 30, and further comprises a phase change heat pipe radiator or a semiconductor heat exchange unit, wherein the heat dissipation fins 30 are tightly attached to the side surface of the oil tank shell wall 12 to conduct the heat of the transformer oil in the oil tank to the outside, and the phase change heat pipe radiator or the semiconductor heat exchange unit is used to dissipate heat, the cold end is connected to the heat dissipation fins 30, the hot end is connected to a heat dissipation block, and the heat dissipation fins 30 dissipate heat more quickly and effectively through forced convection heat exchange.

[0048] Finally, it should be emphasized that the present application is not limited to the above-described embodiments, which are merely the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An oil-immersed transformer, characterized in that, This includes the tank enclosure, the transformer body, and the cooling system; The fuel tank body is made of aluminum alloy and includes a fuel tank cover plate, a fuel tank shell wall, a fuel tank bottom plate, and two fuel tank fixing seats. The fuel tank shell wall has openings at both the top and bottom ends. The fuel tank bottom plate is fixed to the lower edge of the fuel tank shell wall, and the shape of the fuel tank bottom plate matches the lower opening of the fuel tank shell wall. The fuel tank fixing seats are fixed to the lower part of the fuel tank bottom plate. The fuel tank cover plate is fixed to the upper edge of the fuel tank shell wall, and the shape of the fuel tank cover plate matches the upper opening of the fuel tank shell wall. The fuel tank cover plate is provided with a high-pressure sleeve and a low-pressure sleeve. The transformer body is located inside the space enclosed by the oil tank. The transformer body includes a planar wound core, a high-voltage coil, a low-voltage coil, an upper clamp, and a lower clamp. The low-voltage coil is sleeved outside the planar wound core, and the high-voltage coil is sleeved outside the low-voltage coil. The upper clamp is located at the upper end of the high-voltage coil and the low-voltage coil, and the lower clamp is located at the lower end of the high-voltage coil and the low-voltage coil. The upper clamp and the lower clamp are fixedly connected by a connecting rod. The upper clamp and the lower clamp clamp the high-voltage coil and the low-voltage coil from the upper and lower sides, respectively. The upper clamp and the lower clamp are made of aluminum alloy. The heat dissipation device is fixed to the outer wall of the oil tank shell; The aluminum alloy material is a nano-aluminum alloy composite material, which includes nano-aluminum alloy and carbon nanoparticles, and the carbon nanoparticles are oriented parallel to the surface of the nano-aluminum alloy composite material. The cross-section of the tank shell wall is oblong; The planar wound core is made of silicon steel sheets of different widths continuously wound together; The planar wound core includes an amorphous alloy core and a cladding layer. The cladding layer is disposed on the outer surface of the amorphous alloy core, and the shape of the cladding layer is adapted to the shape of the amorphous alloy core. A magnetically conductive adhesive layer is also provided between the cladding layer and the amorphous alloy core, and the magnetically conductive adhesive layer fills the space between the cladding layer and the amorphous alloy core. The heat dissipation device includes two sets of heat dissipation fins. Each heat dissipation fin includes a heat dissipation base plate and several heat dissipation fins. The heat dissipation fins are fixed side by side to one side of the heat dissipation base plate, and the other side of the heat dissipation base plate is fixed to the vertical side of the oil tank shell wall. The two sets of heat dissipation fins are arranged opposite to each other.

2. The oil-immersed transformer as described in claim 1, characterized in that, The heat dissipation device also includes several phase change heat pipe radiators, each phase change heat pipe radiator having a hot end and a cold end. The cold end of the phase change heat pipe radiator is connected to the heat dissipation fins, and the hot end of the phase change heat pipe radiator is connected to a heat dissipation block, on which corrugated toothed heat dissipation fins are provided.

3. An oil-immersed transformer as described in claim 2, characterized in that, A cooling fan is correspondingly provided on the heat sink.

4. An oil-immersed transformer as described in claim 1, characterized in that, The heat dissipation device also includes several semiconductor heat exchange units, each semiconductor heat exchange unit having a hot end and a cold end. The cold end of the semiconductor heat exchange unit is connected to the heat dissipation fins, and the hot end of the semiconductor heat exchange unit is connected to a heat dissipation block, on which corrugated toothed heat dissipation fins are provided.

5. An oil-immersed transformer as described in any one of claims 1 to 4, characterized in that, The planar wound core is a single-phase three-column core or a three-phase three-column core.

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