Oil-immersed transformer based on circulating heat dissipation

Abstract

The application belongs to the technical field of transformer heat dissipation, and particularly relates to an oil-immersed transformer based on circulating heat dissipation, which comprises a coil winding, an inclined flap assembly, an adjusting driving assembly, a box assembly, a forced circulation assembly, a gravity oil supplement assembly and a top accessory. The inclined flap assembly and the adjusting driving assembly are located in the interior of the coil winding, and are distributed along a spiral line. The coil winding is arranged in the box assembly, the inclined flap assembly is arranged in the box assembly, and the adjusting driving assembly is slidingly arranged on the inclined flap assembly. The oil temperature is raised due to heat generation, the lifting support is driven to ascend and the flap body is driven to overturn, the originally vertical channel is changed into a spiral ascending flow channel, the thermal boundary layer with a slow flow rate is destroyed, and the heat dissipation capacity is improved.

Description

Technical Field

[0001] This invention belongs to the field of transformer heat dissipation technology, specifically referring to an oil-immersed transformer based on circulating heat dissipation. Background Technology

[0002] The core and transformer coils of an oil-immersed transformer are completely immersed in insulating oil, which not only provides insulation but also dissipates the heat generated during the transformation process and dissipates it through heat dissipation fins. The most common circulation mode in existing small power transformers is automatic circulation, which uses the decrease in density of the oil after it heats up as a driving source, so that the oil in the tank can circulate slowly. For transformers with higher power and higher heat generation, pumps or impellers are used to force oil circulation. This cooling method has higher power, but it loses the advantages of the natural circulation mode, which has zero power consumption and no noise (the noise of liquid flow is negligible).

[0003] In existing technologies, the application range of natural circulation is relatively narrow, and transformers with slightly higher power require the addition of a forced circulation module. Summary of the Invention

[0004] In response to the above situation, in order to broaden the engineering boundaries of the automatic circulating heat dissipation mode and expand the coverage of effective working conditions, this invention proposes a tilting flap assembly, an adjustment drive assembly, and a housing assembly. By using the oil temperature rise caused by heat generation, the lifting bracket is driven to rise and the flap body is rotated, transforming the original vertical channel into a spiral upward flow channel, thereby breaking the slow-flowing thermal boundary layer and improving heat dissipation capacity. Furthermore, when the flap body is tilted, the increased oil temperature will also increase the upward driving force of the lifting bracket to balance the upward impact force on the flap body when the oil flows, ensuring smooth oil flow.

[0005] The technical solution adopted by the present invention is as follows: The present invention proposes an oil-immersed transformer based on circulating heat dissipation, including a coil winding, a tilting flap assembly, an adjustment drive assembly, a housing assembly, a gravity oil replenishment assembly, and a top accessory. The tilting flap assembly and the adjustment drive assembly are located inside the coil winding and are distributed along a spiral line. The coil winding is disposed in the housing assembly, the tilting flap assembly is disposed in the housing assembly, and the adjustment drive assembly is slidably disposed on the tilting flap assembly. The gravity-assisted oil replenishment component is located on the top of the housing assembly, and the top accessory is located on the top of the housing assembly; The coil winding includes an iron core and a transformer coil. The iron core is located in the housing assembly, and the transformer coil is wound around the iron core.

[0006] Furthermore, the tilting flap assembly includes a flap support, a flip shaft, and a flap body. The flap support is fixedly connected to the housing assembly. The flip shaft is tilted and rotatably located in the flap support. The flap body is fixedly connected to the flip shaft. The two ends of the flap body are symmetrically provided with arc-shaped edges.

[0007] Furthermore, the adjustment drive assembly includes a lifting bracket and a shift fork. The lifting bracket is engaged and slidably disposed on the side of the flip plate bracket. The shift fork is horizontally disposed and rotatably disposed in the lifting bracket. A shift rod is provided on the side of the flip plate body. A central groove is provided in the middle position of the shift fork. The shift rod is slidably disposed in the central groove.

[0008] Preferably, the adjustment drive assembly further includes a temperature control chamber and a telescopic platform. The temperature control chamber is fixedly connected to the iron core, and the telescopic platform is engaged and slidably disposed in the temperature control chamber. The temperature control chamber is filled with a working fluid that can expand when heated. The lifting bracket is fixedly connected to the telescopic platform. When the lifting bracket drives the fork to rise, the flip plate body can change from a vertical state to an inclined state.

[0009] Furthermore, the enclosure assembly includes a base, a housing, and a top cover. The housing is disposed on the base, the top cover is disposed on the housing, and heat dissipation fins are arrayed on the side of the housing.

[0010] Preferably, the iron core is provided with support legs, the iron core is mounted on the base via the support legs, and the bottom of the base is provided with a crossbeam.

[0011] Furthermore, the gravity oil replenishment assembly includes a gravity oil replenishment pipe and a transparent pipe. The gravity oil replenishment pipe is located on the upper cover and communicates with the housing. Observation windows are evenly distributed in a ring on the gravity oil replenishment pipe, and the transparent pipe is located in the gravity oil replenishment pipe.

[0012] Furthermore, the top accessory includes an input cable and an output cable, which are fixed to and pass through the top cover, and are connected to the transformer coil.

[0013] Furthermore, the present invention also includes a forced circulation component, which includes a motor, an impeller, and a guide plate. The motor is located above the upper cover, the impeller is located on the output shaft of the motor, and the guide plate is located below the upper cover.

[0014] The beneficial effects achieved by the present invention using the above structure are as follows: (1) By changing the angle of the flap body, the flow guiding state of the flap body to the liquid can be switched, thereby enabling the heat dissipation circulation mode of the transformer to switch between natural convection and spiral flow.

[0015] (2) The working medium in the temperature control chamber can be a low boiling point medium, so as to ensure that the pressure in the temperature control chamber can change with the temperature of the location, thereby realizing the longitudinal drive of the lifting support.

[0016] (3) When the flap body is in an inclined state, the oil temperature rises, which will also increase the upward driving force of the lifting bracket to balance the upward impact force on the flap body when the oil flows.

[0017] (4) The flip angle of the flip plate body can be controlled by the rise of the fork, and the rise and fall of the fork is driven by the telescopic table; thus, the technical effect of the angle of the flip plate body changing with temperature can be achieved.

[0018] (5) The forced circulation component can further improve the heat dissipation power by forcing the oil to circulate through the rotation of the impeller when the heat dissipation demand exceeds the upper limit of natural flow heat dissipation.

[0019] (6) The gravity oil replenishment component can not only automatically replenish the oil in the tank assembly, but also compensate for the volume of oil due to thermal expansion and contraction caused by temperature changes; the remaining oil in the transparent tube can be observed through the observation window so that it can be replenished in time. Attached Figure Description

[0020] Figure 1 This is a perspective view of an oil-immersed transformer based on circulating heat dissipation proposed in this invention; Figure 2 This is a front view of an oil-immersed transformer based on circulating heat dissipation proposed in this invention; Figure 3 This is a left view of an oil-immersed transformer based on circulating heat dissipation proposed in this invention; Figure 4 for Figure 2 A cross-sectional view along the cutting line AA; Figure 5 for Figure 3 A cross-sectional view along the cutting line BB; Figure 6 for Figure 2 A cross-sectional view along the section line CC; Figure 7 This is an exploded structural diagram of an oil-immersed transformer based on circulating heat dissipation proposed in this invention. Figure 8 for Figure 7 A magnified view of a section at point I; Figure 9 for Figure 5 Enlarged view of a section at point II; Figure 10 for Figure 6 Enlarged view of a section at point III; Figure 11 for Figure 4 A magnified view of a section at point IV.

[0021] The components include: 1. Coil winding; 2. Inclined flap assembly; 3. Adjustment drive assembly; 4. Housing assembly; 5. Forced circulation assembly; 6. Gravity oil replenishment assembly; 7. Top accessories; 11. Iron core; 12. Transformer coil; 21. Flip plate bracket; 22. Flipping shaft; 23. Flip plate body; 31. Temperature control chamber; 32. Telescopic platform; 33. Lifting bracket; 34. Fork; 41. Base; 42. Housing; 43. Top cover; 51. Motor; 52. Impeller; 53. Guide plate; 61. Gravity oil replenishment pipe; 62. Transparent pipe; 71. Input cable; 72. Output cable; 111. Support leg; 231. Arc edge; 232. Lever; 341. Middle slide; 411. Crossbeam; 421. Heat dissipation fins; 611. Observation window.

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., 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 invention 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 limitations on this invention.

[0025] like Figures 1-11 As shown, the present invention proposes an oil-immersed transformer based on circulating heat dissipation, including a coil winding 1, a tilting flap assembly 2, an adjustment drive assembly 3, a housing assembly 4, a gravity oil replenishment assembly 6, and a top accessory 7. The tilting flap assembly 2 and the adjustment drive assembly 3 are located inside the coil winding 1 and are distributed along a spiral line. The coil winding 1 is disposed in the housing assembly 4, the tilting flap assembly 2 is disposed in the housing assembly 4, and the adjustment drive assembly 3 is slidably disposed on the tilting flap assembly 2. The gravity-assisted oil replenishment component 6 is located on the top of the housing component 4, and the top accessory 7 is located on the top of the housing component 4. The coil winding 1 includes an iron core 11 and a transformer coil 12. The iron core 11 is located in the housing assembly 4, and the transformer coil 12 is wound on the iron core 11.

[0026] The tilting flap assembly 2 includes a flap support 21, a flip shaft 22, and a flap body 23. The flap support 21 is fixedly connected to the housing assembly 4. The flip shaft 22 is tilted and rotatably located in the flap support 21. The flap body 23 is fixedly connected to the flip shaft 22. The two ends of the flap body 23 are symmetrically provided with arc-shaped edges 231.

[0027] By changing the angle of the flap body 23, the flow guiding state of the flap body 23 for the liquid flow can be switched, thereby allowing the heat dissipation circulation mode of the transformer to switch between natural convection and spiral flow.

[0028] The adjustment drive assembly 3 includes a lifting bracket 33 and a shift fork 34. The lifting bracket 33 is engaged and slidably disposed on the side of the flip plate bracket 21. The shift fork 34 is horizontally disposed and rotatably disposed in the lifting bracket 33. A shift rod 232 is provided on the side of the flip plate body 23. A middle slide groove 341 is provided in the middle position of the shift fork 34. The shift rod 232 is slidably disposed in the middle slide groove 341.

[0029] The tilting angle of the flap body 23 can be controlled by raising the fork 34, and the lifting and lowering of the fork 34 is driven by the telescopic table 32; thus, the technical effect of the tilting angle of the flap body 23 changing with temperature can be achieved.

[0030] The adjustment drive assembly 3 also includes a temperature control chamber 31 and a telescopic platform 32. The temperature control chamber 31 is fixedly connected to the iron core 11, and the telescopic platform 32 is engaged and slidably disposed in the temperature control chamber 31. The temperature control chamber 31 is filled with a working fluid that can expand when heated. The lifting bracket 33 is fixedly connected to the telescopic platform 32. When the lifting bracket 33 drives the fork 34 to rise, the flap body 23 can change from a vertical state to an inclined state.

[0031] The working fluid in the temperature control chamber 31 can be a low-boiling-point medium, thereby ensuring that the pressure in the temperature control chamber 31 can change with the temperature of the location, thus realizing the longitudinal drive of the lifting bracket 33.

[0032] The enclosure assembly 4 includes a base 41, a housing 42, and a top cover 43. The housing 42 is disposed on the base 41, and the top cover 43 is disposed on the housing 42. Heat dissipation fins 421 are arranged on the side of the housing 42.

[0033] The iron core 11 is provided with a support leg 111, and the iron core 11 is mounted on the base 41 via the support leg 111. The bottom of the base 41 is provided with a crossbeam 411.

[0034] The gravity oil replenishment component 6 includes a gravity oil replenishment pipe 61 and a transparent pipe 62. The gravity oil replenishment pipe 61 is located on the upper cover 43 and is connected to the housing 42. Observation windows 611 are evenly distributed in a ring on the gravity oil replenishment pipe 61, and the transparent pipe 62 is located in the gravity oil replenishment pipe 61.

[0035] The gravity-assisted oil replenishment component 6 can automatically replenish the oil in the housing component 4 and compensate for the volume of the oil due to thermal expansion and contraction caused by temperature changes; the remaining oil level inside the transparent tube 62 can be observed through the observation window 611 so that it can be replenished in time.

[0036] The top accessory 7 includes an input cable 71 and an output cable 72, which are fixed to and pass through the top cover 43. The input cable 71 and the output cable 72 are connected to the transformer coil 12.

[0037] This solution may also include a forced circulation component 5, which includes a motor 51, an impeller 52 and a guide plate 53. The motor 51 is located above the upper cover 43, the impeller 52 is located on the output shaft of the motor 51, and the guide plate 53 is located below the upper cover 43.

[0038] The forced circulation component 5 can further improve the heat dissipation power by forcing the oil to circulate through the rotation of the impeller 52 when the heat dissipation demand exceeds the upper limit of natural flow heat dissipation.

[0039] In practical use, the cooling circulation method of this device is divided into the following three types: First, the natural convection circulation mode: when the heat dissipation pressure of the transformer is low, the oil temperature is also relatively low; the oil inside the core 11 is heated by absorbing the heat of the coil winding 1, and the heated oil flows upward because the density decreases; the heat in the oil outside the core 11 is conducted to the heat dissipation fins 421 and dissipated, and the cooled oil flows downward because the density increases, thus forming a circulation channel; At this time, the flap body 23 is in a vertical position and will not affect the rise of the oil inside the iron core 11.

[0040] Second, spiral circulation mode: When the heat dissipation pressure of the transformer increases, the oil temperature rises to the predetermined temperature, the medium in the temperature control chamber 31 is heated and expands, pushing the telescopic platform 32 to extend, and at the same time driving the lifting bracket 33 to rise. When the lifting bracket 33 drives the fork 34 to rise, the fork 34 will move the lever 232 and cause the flap body 23 to tilt and deflect. During this process, the rotation of the fork 34 and the sliding of the lever 232 in the middle slide groove 341 can prevent the lever 232 and the fork 34 from getting stuck. After the flap body 23 flips over, the oil that was originally flowing vertically upward will flow along the spiral flow channel formed by the flap body 23, thereby destroying the thermal boundary layer between the oil and the heat source (the thermal boundary layer is the main source of thermal resistance for heat transfer, and destroying the thermal boundary layer can significantly reduce thermal resistance), thus making the heat exchange between the oil and the heat source more thorough and improving heat dissipation efficiency.

[0041] In the spiral circulation mode, the tilt angle of the flap body 23 increases when the oil temperature rises. However, the increase in temperature difference also increases the upward driving force of the lifting bracket 33 to balance the upward impact force on the flap body 23 when the oil flows, so that the oil can flow.

[0042] Third, forced circulation mode: When the heat dissipation pressure of the transformer exceeds the heat dissipation limit of the above two modes, the motor 51 is automatically started, and the oil is forcibly driven by the rotation of the impeller 52. In this mode, the oil can be driven to circulate, and a spiral flow path can be formed inside the iron core 11 by the stirring of the impeller 52, which can cooperate with the flap body 23. Depending on the transformer's specifications and power limit, it may be optional to install the forced circulation component 5; for small power transformers where the first and second circulation modes are sufficient for heat dissipation, the forced circulation component 5 may not be required.

[0043] The three modes mentioned above each have their own advantages and disadvantages, as well as their respective applicable working conditions: The first mode is the most commonly used oil circulation method in existing technology. It has the advantages of self-driving, no power consumption, and no noise. However, due to its low heat and small temperature difference, its heat dissipation power is low and it is suitable for low power consumption conditions. The second mode retains the main advantages of the first mode. By guiding the flow through the flap body 23, the originally vertically flowing oil is transformed into a spiral upward flow, which destroys the thermal boundary layer and improves the heat exchange capacity. However, in this mode, the flow of oil will be resisted by the flap body 23. Therefore, it can only provide sufficient self-circulation driving force when the heat generation is high and the oil temperature difference is large. The third mode is to forcibly increase the flow rate of the oil by means of motor 51 when the heat dissipation demand exceeds the heat dissipation limit of natural circulation. This mode consumes power and produces noise, but the upper limit of heat dissipation capacity is higher.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. An oil-immersed transformer based on circulating heat dissipation, comprising a coil winding (1), a tilting flap assembly (2), and an adjustment drive assembly (3), wherein the tilting flap assembly (2) and the adjustment drive assembly (3) are located inside the coil winding (1), and the tilting flap assembly (2) and the adjustment drive assembly (3) are distributed along a spiral line, characterized in that: It also includes a housing assembly (4), a forced circulation assembly (5), a gravity oil replenishment assembly (6), and a top accessory (7). The coil winding (1) is located in the housing assembly (4), the tilting flap assembly (2) is located in the housing assembly (4), the forced circulation assembly (5) is located in the housing assembly (4), and the adjustment drive assembly (3) is slidably located on the tilting flap assembly (2). The gravity oil replenishment component (6) is located on the top of the housing component (4), and the top accessory (7) is located on the top of the housing component (4); The coil winding (1) includes an iron core (11) and a transformer coil (12). The iron core (11) is located in the housing assembly (4), and the transformer coil (12) is wound around the iron core (11). The tilting flap assembly (2) includes a flap support (21), a flip shaft (22), and a flap body (23). The flap support (21) is fixed in the housing assembly (4). The flip shaft (22) is tilted and rotatably disposed in the flap support (21). The flap body (23) is fixed on the flip shaft (22). The flap body (23) has symmetrical arc edges (231) at both ends. The adjustment drive assembly (3) includes a lifting bracket (33) and a shift fork (34). The lifting bracket (33) is engaged and slidably disposed on the side of the flip plate bracket (21). The shift fork (34) is horizontally disposed and rotatably disposed in the lifting bracket (33). The side of the flip plate body (23) is provided with a lever (232). The shift fork (34) is provided with a middle groove (341) at the middle position. The lever (232) is slidably disposed in the middle groove (341). The adjustment drive assembly (3) also includes a temperature control chamber (31) and a telescopic platform (32). The temperature control chamber (31) is fixed to the iron core (11). The telescopic platform (32) is engaged and slidably disposed in the temperature control chamber (31). The temperature control chamber (31) is filled with a working fluid that can expand when heated. The lifting bracket (33) is fixed to the telescopic platform (32). When the lifting bracket (33) drives the fork (34) to rise, the flip plate body (23) can change from a vertical state to an inclined state.

2. The oil-immersed transformer based on circulating heat dissipation according to claim 1, characterized in that: The enclosure assembly (4) includes a base (41), a housing (42) and a top cover (43). The housing (42) is disposed on the base (41), and the top cover (43) is disposed on the housing (42). The side of the housing (42) is provided with heat dissipation fins (421).

3. An oil-immersed transformer based on circulating heat dissipation according to claim 2, characterized in that: The iron core (11) is provided with a support leg (111), and the iron core (11) is mounted on the base (41) via the support leg (111). The bottom of the base (41) is provided with a crossbeam (411).

4. An oil-immersed transformer based on circulating heat dissipation according to claim 3, characterized in that: The forced circulation assembly (5) includes a motor (51), an impeller (52) and a guide plate (53). The motor (51) is located above the upper cover (43), the impeller (52) is located on the output shaft of the motor (51), and the guide plate (53) is located below the upper cover (43).

5. An oil-immersed transformer based on circulating heat dissipation according to claim 4, characterized in that: The gravity oil replenishment assembly (6) includes a gravity oil replenishment pipe (61) and a transparent pipe (62). The gravity oil replenishment pipe (61) is located on the upper cover (43) and is connected to the housing (42). Observation windows (611) are evenly distributed in a ring on the gravity oil replenishment pipe (61). The transparent pipe (62) is located in the gravity oil replenishment pipe (61).

6. An oil-immersed transformer based on circulating heat dissipation according to claim 5, characterized in that: The top accessory (7) includes an input cable (71) and an output cable (72), which are fixed to and pass through the top cover (43) and are connected to the transformer coil (12).

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