Three-dimensional wound core transformer

Abstract

The invention belongs to the field of transformers, and particularly provides a three-dimensional wound core transformer. The transformer comprises a box body, an air cooling heat dissipation structure is arranged on the side wall of the box body, an inner liquid cooling flow channel used for conducting cooling heat exchange on components in the box body is arranged in the box body and comprises a liquid inlet and a liquid outlet, a heat dissipation flow channel is arranged in the cooling liquid heat dissipation structure, and the heat dissipation flow channel is provided with an inlet allowing cooling liquid to enter and an outlet allowing cooling liquid to flow out. The inlet is communicated with the liquid outlet, the outlet is communicated with the liquid inlet, cooling liquid can circularly flow in the inner liquid cooling flow channel and the heat dissipation flow channel, the cooling liquid heat dissipation structure directly faces the side, away from the box body, of the air cooling heat dissipation structure, and air generated by the air cooling heat dissipation structure directly blows the cooling liquid heat dissipation structure. In the normal operation process, the inner liquid cooling flow channel can conduct heat dissipation on the interior of the box body, the air cooling heat dissipation structure can also conduct heat dissipation on the transformer, air blown out by the air cooling heat dissipation structure directly blows the cooling liquid heat dissipation structure, heat of the cooling liquid heat dissipation structure can also be taken away, and cooling liquid is prevented from being overheated.

Description

Technical Field

[0001] The invention belongs to the field of transformers, and in particular relates to a three-dimensional wound core transformer. Background Art

[0002] The three-dimensional wound core transformer is composed of three wound core single frames with the same geometric dimensions assembled into a triangular three-dimensional arrangement, and the three-phase magnetic circuit lengths are completely equal and completely symmetrical. Compared with the traditional laminated core, there are no seams between the layers, the magnetic circuit is evenly distributed, there is no obvious high-resistance area, and the performance is more stable. During continuous operation, due to the inevitable existence of core loss, winding loss, and stray loss, the transformer will continue to generate a certain amount of heat. At present, three-dimensional wound core transformers generally only use one heat dissipation method (water cooling or air cooling) for heat dissipation and cooling. For transformers with higher power, the more heat they generate, it is difficult to dissipate the heat quickly by using only one heat dissipation method, which can easily cause the internal temperature of the transformer to be too high and cause failures.

[0003] After searching, the patent application with application publication number CN118571613A discloses an oil-immersed three-dimensional wound core transformer, which integrates a water-cooled heat dissipation structure and an air-cooled heat dissipation structure. Specifically, the water-cooled heat dissipation structure includes a cooling circulation pipe located in the transformer box, and the cooling circulation pipe can be circulated with a coolant. During the flow of the coolant, the coolant can exchange heat with the transformer oil in the box to remove the heat in the box. The air-cooled heat dissipation structure includes a heat dissipation corrugated sheet arranged on the side wall of the transformer box, and a mounting plate is arranged above the heat dissipation corrugated sheet. A hair dryer is arranged on the mounting plate. The hair dryer can be controlled to rotate to generate a vertical downward airflow to remove the heat from the heat dissipation corrugated sheet. In addition, the transformer is also equipped with a controller and a temperature sensor, which can control the water-cooled heat dissipation structure and the air-cooled heat dissipation structure to operate simultaneously according to the actual temperature conditions in the box.

[0004] Compared with the solution of a single heat dissipation method, the above transformer improves the heat dissipation effect by configuring two heat dissipation methods. However, the coolant in the water-cooled heat dissipation structure will also be heated into "hot water" during long-term operation, and the heat dissipation capacity will decrease. The above patent application does not disclose the relevant means of cooling and dissipating the coolant. When used for a long time, the coolant temperature rises and the cooling effect decreases significantly. Summary of the invention

[0005] The object of the present invention is to provide a three-dimensional wound core transformer to solve the technical problem that the cooling liquid of the three-dimensional wound core transformer with two heat dissipation modes of cooling liquid and air cooling in the prior art cannot effectively cool down.

[0006] To achieve the above purpose, the technical solution of the three-dimensional wound core transformer provided by the present invention is: A three-dimensional wound core transformer, the transformer comprises a box body, a side wall of the box body is provided with an air-cooled heat dissipation structure, the air-cooled heat dissipation structure comprises a fan, an inner liquid-cooled flow channel for cooling and exchanging heat for components inside the box body is provided inside the box body, the inner liquid-cooled flow channel comprises a liquid inlet and a liquid discharge port, the transformer also comprises a coolant heat dissipation structure located outside the box body, the coolant heat dissipation structure has a heat dissipation flow channel inside, the heat dissipation flow channel has an inlet for coolant to enter and an outlet for coolant to flow out, the inlet is connected with the liquid discharge port, and the outlet is connected with the liquid inlet, so that the coolant can circulate in the inner liquid-cooled flow channel and the heat dissipation flow channel, and the coolant heat dissipation structure is directly opposite to the side of the air-cooled heat dissipation structure away from the box body, so that the wind generated by the fan can directly blow the coolant heat dissipation structure.

[0007] As a further improvement, the air-cooled heat dissipation structure includes a protective cover, the fan is located in the protective cover, and the coolant heat dissipation structure is installed on a side of the protective cover away from the box body.

[0008] As a further improvement, the airflow direction caused by the wind generated by the fan is defined as a front-to-back direction, and the coolant heat dissipation structure includes a plurality of heat dissipation intervals extending vertically and penetrating front to back.

[0009] As a further improvement, the transformer is also provided with a cleaning mechanism, which includes a cleaning member that can reciprocate back and forth in the heat dissipation interval to clean dust in the interval.

[0010] As a further improvement, the fan is an axial flow fan, and the power output end of the fan is transmission-connected with a rotatable reciprocating screw. The cleaning frame on which the cleaning member is installed is sleeved outside the reciprocating screw and threadedly connected to the reciprocating screw to drive the cleaning member to reciprocate under the drive of the reciprocating screw.

[0011] As a further improvement, the fan is an axial flow fan, which includes a rotatable and hollow impeller, with more than three evenly distributed blades installed on the circumference of the impeller, a control motor installed inside the impeller, the power output shaft of the control motor is fixedly connected with a driving bevel gear, one end of the blade is inserted into the impeller and a driven bevel gear meshing with the driving bevel gear is installed on this end, so that the angle of the blade can be controlled by the control motor.

[0012] As a further improvement, the impellers are provided with two impellers spaced apart from each other, and the two impellers rotate in the same direction.

[0013] As a further improvement, the same driving motor drives the two impellers to rotate, and the two impellers are connected by a ring-shaped traction member.

[0014] As a further improvement, the transformer comprises a vibration-damping base, the box body is mounted on the vibration-damping base, and a damping spring is provided on the vibration-damping base.

[0015] As a further improvement, the vibration-damping base includes a mounting seat, and more than three evenly distributed sliding grooves are provided on the top of the mounting seat. A sliding support body that can slide along the sliding groove is installed in the sliding groove. At least part of the damping spring is a compression spring that is supported between the sliding support body and the mounting seat. The end of the sliding support body that is away from the compression spring is higher than the mounting seat and supports the box body.

[0016] The present invention belongs to a combination of inventions and creations, and its beneficial effects are: during the normal operation of the three-dimensional wound core transformer in the present invention, the coolant can flow between the internal liquid cooling channel and the heat dissipation channel in the coolant heat dissipation structure, wherein the heat can be dissipated outwards when flowing in the heat dissipation channel to reduce the temperature of the coolant. After the fan in the air-cooled heat dissipation structure is started, it can not only directly dissipate heat from the transformer, but also directly blow the coolant heat dissipation structure to take out the heat of the coolant flowing in the heat dissipation channel, which helps the coolant to cool down quickly, achieving the effect of "1+1>2", thereby avoiding long-term high-temperature operation of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of a three-dimensional wound core transformer in the present invention; Figure 2 for Figure 1 Structural schematic diagram of the middle vibration damping base; Figure 3 for Figure 1 Exploded diagram of the air cooling structure, coolant cooling structure and cleaning mechanism; Figure 4 An exploded view of the impeller and blades of the three-dimensional wound core transformer embodiment of the present invention; Figure 5 for Figure 1 A schematic diagram of the structure of the cooling liquid heat dissipation structure; Figure 6 It is a transmission relationship diagram of the cleaning mechanism and the air-cooling heat dissipation structure of the three-dimensional wound core transformer embodiment of the present invention; Figure 7 for Figure 6 A partial enlarged view of point A in the middle.

[0018] Description of reference numerals: 1. Box body; 2. Air-cooled heat dissipation structure; 21. Protective cover; 22. Driving motor; 23. Impeller; 24. Control motor; 25. Power output shaft; 26. Active bevel gear; 27. Driven shaft; 28. Driven bevel gear; 29. ​​Blade; 3. Coolant heat dissipation structure; 31. Support plate; 32. Connecting plate; 33. Heat dissipation plate; 34. Outlet; 35. Inlet; 4. Vibration reduction base; 41. Mounting seat; 42. Mounting groove; 43. Damper; 44. Slide; 45. Damping spring; 46. Slider; 47. Support column; 48. Mounting plate; 5. Cleaning mechanism; 51. Fixed plate; 52. Cleaning parts; 53. Connecting rod; 54. Reciprocating screw; 55. Threaded sleeve; 6. Sprocket. DETAILED DESCRIPTION

[0019] In order to provide a three-dimensional wound core transformer with stronger heat dissipation capability, the basic technical concept of the present invention is to combine air cooling and liquid cooling, and the cooling air can dissipate the liquid cooling to form a combined heat dissipation structure to avoid excessively high coolant temperature of the liquid cooling.

[0020] Based on the above concept, the present invention is further described in detail below in conjunction with embodiments.

[0021] As a most basic embodiment, Figure 1 As shown, the three-dimensional wound core transformer provided in this embodiment includes a box body 1. The structure of the core, coil, etc. inside the box body 1 is consistent with the prior art and will not be expanded here. The following only describes the heat dissipation related structure. An air-cooled heat dissipation structure 2 is provided on the side wall of the box body 1. The so-called air-cooled heat dissipation structure 2 refers to a heat dissipation structure that can blow out cooling air. Basically, it should include a fan. Preferably, as Figure 1 As shown, air-cooling heat dissipation structures 2 can be provided on the side walls of three sides of the box body 1, but it should be emphasized that in some alternative embodiments, air-cooling heat dissipation structures 2 can also be provided only on the side walls of two sides. The box body 1 is provided with an internal liquid cooling channel (not shown in the figure) for cooling and exchanging heat for the components inside the box body 1. The internal liquid cooling channel can be a liquid cooling plate or a heat exchange plate type channel or a liquid cooling channel consistent with the document cited in the background technology. The specific type is not limited, and there is a circulating coolant (generally water) inside. A coolant heat dissipation structure 3 is provided outside the box body 1, and a heat dissipation channel is provided inside the coolant heat dissipation structure 3. The heat dissipation channel here is connected to the internal liquid cooling channel. Specifically, as Figure 1 , Figure 3 and Figure 5As shown, the internal liquid cooling channel includes a liquid inlet and a liquid discharge port, and the heat dissipation channel has an inlet 35 for the coolant to enter and an outlet 34 for the coolant to flow out. The inlet 35 is connected to the liquid discharge port, and the outlet 34 is connected to the liquid inlet. The coolant can circulate between the internal liquid cooling channel and the heat dissipation channel. Naturally, the transformer is also equipped with a pump to drive the coolant to circulate. When the coolant flows in the coolant heat dissipation structure 3, the heat dissipation effect can be achieved. The coolant heat dissipation mechanism is directly opposite to the side of the air-cooled heat dissipation structure 2 that is away from the box body 1, so that the wind generated by the fan directly blows the coolant heat dissipation structure 3.

[0022] From the analysis of the above structure, it can be known that in the present embodiment, during normal operation, firstly, the internal liquid cooling channel can dissipate the heat inside the box body 1, and the coolant can dissipate the heat in the coolant heat dissipation structure 3 during the circulation process. Secondly, the air-cooled heat dissipation structure 2 can also dissipate the heat of the transformer. At the same time, the wind blown out by the air-cooled heat dissipation structure 2 directly blows the coolant heat dissipation structure 3 and can also take away the heat of the coolant heat dissipation structure 3, thereby enhancing the cooling and heat dissipation effect of the coolant and avoiding overheating of the coolant.

[0023] As a preferred embodiment, Figure 1 and Figure 3 As shown, the air-cooled heat dissipation structure 2 includes a protective cover 21, the fan is located in the protective cover 21, and the coolant heat dissipation structure 3 is installed on the side of the protective cover 21 away from the box body 1. The protective cover 21 can protect the fan on the one hand, and on the other hand, it serves as an installation base for installing the coolant heat dissipation structure 3, which can save a separate installation bracket for installing the coolant heat dissipation structure 3, and can directly ensure that the wind generated by the fan blows directly to the coolant heat dissipation structure 3.

[0024] As a preferred embodiment, the fan is an axial flow fan, such as Figure 4 As shown, it specifically includes a driving motor 22 and an impeller 23 that can rotate under the drive of the driving motor 22. The impeller 23 is equipped with blades 29. At least three blades 29 should be provided and evenly distributed around the impeller 23. Compared with the centrifugal fan, the axial flow fan has a simple structure and is more flexible to use.

[0025] Preferably, Figure 4 As shown, the impeller 23 is a hollow structure, a control motor 24 is installed inside the impeller 23, a power output shaft 25 of the control motor 24 is connected to a driving bevel gear 26, and one end of the blade 29 is inserted into the impeller 23 and a driven bevel gear 28 meshing with the driving bevel gear 26 is installed on the end. In order to facilitate the installation of the driven bevel gear 28, a driven shaft 27 can be installed on the impeller 23. By controlling the control motor 24, the angle of the blade 29 can be changed, thereby changing the air volume. In this way, the air volume can be flexibly controlled according to the temperature of the transformer. When the temperature of the transformer is low, the air volume can be reduced, which has an energy-saving effect.

[0026] In order to increase the air outlet area of ​​the air-cooling heat dissipation structure 2, in a more preferred embodiment, Figure 6 Locked, there are two impellers 23, and the two impellers 23 are arranged at intervals up and down, and the rotation directions of the two impellers 23 are the same. Compared with only one impeller 23, the two impellers 23 can be superimposed, and the air output and air output area are both larger.

[0027] Furthermore, the same driving motor 22 can be used to drive the two impellers 23 to rotate. Specifically, the two impellers 23 are connected to each other through an annular traction member. Figure 6 and Figure 7 As shown, the annular traction member can be a chain, and a sprocket 6 is installed on both impellers 23, so that the two impellers 23 can rotate synchronously. Of course, in other embodiments, the annular traction member can also be a synchronous belt. This method can save a driving motor 22, has a lower cost (generally speaking, the cost of the motor is higher than that of the transmission member), and is also convenient for control.

[0028] In order to enhance the heat dissipation capability of the coolant heat dissipation structure 3, as Figure 5 As shown, the coolant heat dissipation structure 3 includes a plurality of heat dissipation intervals extending vertically and penetrating front to back. The front-to-back direction here can be defined as the flow direction of the wind generated by the fan. For an axial flow fan, the front-to-back direction refers to the axial direction. In fact, the coolant heat dissipation structure 3 at this time is consistent with the general heat sink (radiator) structure. Specifically, it is composed of support plates 31 on the left and right sides, connecting plates 32 at the top and bottom ends, and heat dissipation plates 33 located between the connecting plates 32. The intervals between the heat dissipation plates 33 constitute the heat dissipation intervals. Compared with the plate-shaped heat dissipation structure without heat dissipation intervals, it is obvious that this structure has a larger heat dissipation area and a stronger heat dissipation capacity.

[0029] Considering that the heat dissipation interval of the coolant heat dissipation structure 3 may be blocked by impurities, dust, etc. after long-term use, in a more preferred embodiment, the transformer is further provided with a cleaning mechanism 5, which includes a cleaning member 52 that can reciprocate back and forth in the heat dissipation interval to clean the dust in the interval. The cleaning member 52 can be a cleaning brush or a sponge brush, etc. During the reciprocating movement of the cleaning member 52, the impurities and dust in the heat dissipation interval can be taken out by the cleaning member 52, thereby preventing the heat dissipation interval from being blocked.

[0030] In addition to configuring the cleaning mechanism 5 with an independent driving device (such as a cylinder or an electric push rod) for driving the cleaning member 52 to reciprocate, in a preferred embodiment, the cleaning mechanism 5 and the fan can be linked to each other so that the rotation of the axial flow fan is linked to the cleaning member 52 to reciprocate back and forth. Specifically, Figure 6 and Figure 7As shown, the power output end of the fan is connected to a rotatable reciprocating screw 54. According to the actual layout of each part, the reciprocating screw 54 can be rotatably installed on the air-cooled heat dissipation structure 2 and connected to any rotating shaft in the fan. The cleaning mechanism 5 includes a cleaning frame. Specifically, the cleaning frame can include two parts, namely a fixed plate 51 (fixing the cleaning member 52) and a connecting rod 53 (supporting and transmitting). The cleaning frame is sleeved outside the reciprocating screw 54 and is threadedly connected to the reciprocating screw 54. Specifically, a threaded sleeve 55 can be installed on the cleaning frame or a threaded hole can be processed to drive the cleaning member 52 to reciprocate under the drive of the reciprocating screw 54. In this way, a set of driving devices can be omitted, and the cleaning operation can be completed while ensuring air-cooled heat dissipation, which is convenient for control. Correspondingly, a through hole is provided on the protective cover 21 for the connecting rod 53 to pass through.

[0031] Considering that vibration is inevitable during the operation of the transformer, in some embodiments, such as Figure 1 and Figure 2 As shown, the transformer also includes a vibration reduction base 4, and the box body 1 is mounted on the vibration reduction base 4. In order to play a basic vibration reduction role, the vibration reduction base is provided with a damping spring 45. In this way, when installing the transformer, there is no need to install a vibration reduction structure on the corresponding installation foundation, which is convenient and efficient.

[0032] As a preferred embodiment of the shock-absorbing base, Figure 2 As shown, the shock-absorbing base includes a mounting seat 41, and the mounting seat 41 serves as a supporting mounting base. The top of the mounting seat 41 is provided with more than three (four in the figure) evenly distributed slide grooves 44, and the slide grooves 44 are equipped with a sliding support body that can slide along the slide grooves 44. Part of the damping spring 45 is a compression spring and is placed between the sliding support body and the mounting seat 41. The end of the sliding support body that is away from the compression spring is higher than the mounting seat 41 and supports the box body 1. Specifically, the sliding support body can be an assembly composed of multiple parts, specifically including a slider 46, a support column 47 and a mounting plate 48. Of course, the sliding support body can also be an independent workpiece formed in one piece. This structure can ensure that the compression spring is stably subjected to axial force and has better stability.

[0033] In addition to the above-mentioned vibration reduction structure, the axis of another part of the damping spring 45 extends vertically, and cooperates with the vibration reduction guide column to form a damper 43. Correspondingly, the mounting seat 41 is also provided with a vertically extending mounting groove 42, and the damper 43 is arranged in the mounting groove 42. The damper 43 and the sliding support body cooperate together to achieve a better vibration reduction effect. However, it should be noted that those skilled in the art understand that in other embodiments, the damper 43 may not be provided.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A three-dimensional wound core transformer, characterized in that: The transformer comprises a box body, a side wall of the box body is provided with an air-cooled heat dissipation structure, the air-cooled heat dissipation structure comprises a fan, an inner liquid-cooled flow channel for cooling and exchanging heat with components inside the box body is provided inside the box body, the inner liquid-cooled flow channel comprises a liquid inlet and a liquid discharge port, the transformer also comprises a coolant heat dissipation structure outside the box body, the coolant heat dissipation structure has a heat dissipation flow channel inside, the heat dissipation flow channel has an inlet for coolant to enter and an outlet for coolant to flow out, the inlet is connected with the liquid discharge port, and the outlet is connected with the liquid inlet, so that the coolant can circulate in the inner liquid-cooled flow channel and the heat dissipation flow channel, and the coolant heat dissipation structure is directly opposite to the side of the air-cooled heat dissipation structure away from the box body, so that the wind generated by the fan can directly blow the coolant heat dissipation structure.

2. The three-dimensional wound core transformer according to claim 1, characterized in that: The air-cooled heat dissipation structure comprises a protective cover, a fan is located in the protective cover, and a coolant heat dissipation structure is installed on a side of the protective cover away from the box body.

3. The three-dimensional wound core transformer according to claim 1 or 2, characterized in that: The airflow direction caused by the wind generated by the fan is defined as a front-to-back direction, and the coolant heat dissipation structure includes a plurality of heat dissipation intervals extending vertically and penetrating front to back.

4. The three-dimensional wound core transformer according to claim 3 is characterized in that: The transformer is also equipped with a cleaning mechanism, which includes a cleaning member that can reciprocate back and forth in the heat dissipation interval to clean dust in the interval.

5. The three-dimensional wound core transformer according to claim 4, characterized in that: The fan is an axial flow fan, and a rotatable reciprocating screw is connected to the power output end of the fan. The cleaning frame on which the cleaning member is installed is sleeved outside the reciprocating screw and is threadedly connected to the reciprocating screw to drive the cleaning member to reciprocate under the drive of the reciprocating screw.

6. The three-dimensional wound core transformer according to claim 1 or 2, characterized in that: The fan is an axial flow fan, which includes a rotatable and hollow impeller, with more than three evenly distributed blades installed on the circumference of the impeller, a control motor installed inside the impeller, a power output shaft of the control motor is fixedly connected with a driving bevel gear, one end of the blade is inserted into the impeller and a driven bevel gear meshing with the driving bevel gear is installed on this end, so that the angle of the blade can be controlled by the control motor.

7. The three-dimensional wound core transformer according to claim 6, characterized in that: The impellers are provided with two impellers spaced apart from each other, and the two impellers rotate in the same direction.

8. The three-dimensional wound core transformer according to claim 7, characterized in that: The same driving motor drives the two impellers to rotate, and the two impellers are connected by a ring-shaped traction member.

9. The three-dimensional wound core transformer according to claim 1 or 2, characterized in that: The transformer comprises a vibration reduction base, a box body is arranged on the vibration reduction base, and a damping spring is arranged on the vibration reduction base.

10. The three-dimensional wound core transformer according to claim 9, characterized in that: The vibration-damping base includes a mounting seat, and more than three evenly distributed sliding grooves are provided on the top of the mounting seat. A sliding support body that can slide along the sliding groove is installed in the sliding groove. At least part of the damping spring is a compression spring that is pressed between the sliding support body and the mounting seat. The end of the sliding support body that is away from the compression spring is higher than the mounting seat and supports the box body.

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