Transformer cooling device

Abstract

The invention discloses a transformer cooling device, which belongs to the technical field of transformer cooling and comprises a flow guide cover, a heat dissipation assembly and an air inlet pipe. The flow guide cover comprises an air inlet, an air outlet and a flow guide assembly, the flow guide assembly is used for guiding airflow to the air outlet and the side wall of the side, opposite to the air inlet, of the flow guide cover, and a transformer is arranged in the flow guide cover. The heat dissipation assembly is arranged on the periphery of the transformer. And the air inlet pipe is communicated with the air inlet. The airflow input by the air inlet pipe acts on the transformer surface heat dissipation assembly opposite to the air inlet, and the airflow flowing towards the top of the flow guide cover flows in the vertical downward direction and the side wall of the side, opposite to the air inlet, of the flow guide cover under the action of the flow guide assembly. And the air flow is uniformly guided to other side surface heat dissipation assemblies of the transformer. The flowing path of the air flow is relatively clear through the guiding effect, the air flow is effectively and uniformly diffused to each side of the transformer, and the heat dissipation uniformity of the heat dissipation assembly is improved.

Description

Technical Field

[0001] The invention belongs to the field of transformer cooling, in particular to a transformer cooling device. Background Art

[0002] As an important part of the rail transit power supply system, the stable operation of the transformer is crucial to the safety and performance of the train. In order to ensure the reliability of the transformer under high load and long-term operation, the heat dissipation device has become a key part of the transformer design. At present, the widely used heat dissipation method for rail transit transformers mostly uses fans for cooling. By introducing cooling airflow from the side of the heat dissipation device, the airflow flows through the heat dissipation cavity and is discharged from the bottom of the heat dissipation device and discharged to the external rails.

[0003] However, the structural design in the heat dissipation cavity often cannot achieve uniform airflow distribution, resulting in a complex flow path of the cooling airflow in the cavity. Part of the airflow may be discharged directly along the shortest path, while the other part of the airflow will be retained or vortexed in the cavity, reducing the heat dissipation efficiency. Airflow movement and vortex phenomena will cause irregular aerodynamic noise, which affects the ride comfort of rail transit vehicles. In addition, due to the unevenness of airflow guidance, the cooling airflow cannot evenly cover the entire heat dissipation cavity, resulting in poor heat dissipation in some areas of the transformer, which may cause local overheating and affect the service life and stability of the transformer.

[0004] In order to improve the uniformity of heat dissipation, some transformer structures will increase the number and range of fans, but this will significantly increase the space occupied by the heat dissipation device and is not suitable for the extremely compact structural layout of rail vehicles. Some radiator structures will use multiple guide tubes to guide the airflow to achieve full airflow coverage, but too many guide tubes will increase wind resistance, and the resulting vibration and noise will also increase. Summary of the invention

[0005] The object of the present invention is to provide a transformer cooling device to solve the above problems in the prior art.

[0006] A transformer cooling device is provided, comprising:

[0007] A flow guide cover, comprising an air inlet arranged on a side wall, an air outlet arranged on a bottom wall, and a flow guide assembly arranged on a top wall, wherein the flow guide assembly is used to guide the airflow to the air outlet and to the side wall of the flow guide cover opposite to the air inlet, and a transformer is arranged in the flow guide cover;

[0008] A heat dissipation component, wherein the heat dissipation component is arranged at the periphery of the transformer;

[0009] An air inlet pipe is communicated with the air inlet.

[0010] As a further solution of the present invention: the air inlet duct includes a first air duct and a second air duct, the first air duct is used to guide the airflow to the heat dissipation component arranged opposite to the air inlet, and the second air duct is used to guide the airflow to the guide component. The flow diversion design is realized by the first air duct and the second air duct, which effectively solves the problem of airflow concentration, makes the airflow path distinction more obvious, and distributes the airflow in each flow direction, so as to achieve uniform coverage of the cooling airflow on each side surface of the transformer and improve the overall heat dissipation effect.

[0011] As a further solution of the present invention: an arc-shaped guide plate is provided in the air inlet duct, and the first air duct and the second air duct are formed by the isolation of the arc-shaped guide plate, and the arc-shaped guide surface of the arc-shaped guide plate extends toward the flow guide assembly. The arc-shaped guide plate forms two independent airflow paths through isolation, and the arc-shaped guide surface extends to the flow guide assembly to ensure that the airflow is guided in a stable and uniform direction. The airflow distribution path is optimized, airflow movement and vortex phenomena are avoided, aerodynamic noise is reduced, and cooling efficiency and the stability of equipment operation are further improved.

[0012] As a further solution of the present invention: the heat dissipation assembly includes a plurality of heat dissipation fins, and the plurality of heat dissipation fins are arranged in sequence in the horizontal direction of the transformer. These heat dissipation fins are arranged horizontally and spaced to form horizontally arranged gaps, so that the airflow flowing from top to bottom can smoothly pass through each heat dissipation fin, eliminating the blocking structure to the greatest extent, so that the airflow is fully in contact with the entire section of the heat dissipation fin, and the heat dissipation uniformity is ensured.

[0013] As a further solution of the present invention: the four side circumferences of the transformer are all provided with heat dissipation components, and the output end of the air inlet pipe is in a trumpet shape with the diameter extending from small to large. The trumpet-shaped air inlet pipe structure expands the coverage range of the airflow and reduces the flow rate, so that the airflow is evenly distributed, and the four sides of the transformer are fully covered for heat dissipation, further enhancing the uniformity of heat dissipation.

[0014] As a further solution of the present invention: on the heat dissipation assembly on the side opposite to the air inlet pipe of the transformer, the gap size between adjacent heat dissipation fins on the heat dissipation assembly increases in sequence from top to bottom in the vertical direction. When the airflow enters between the heat dissipation fins, the airflow flowing upward will be decompressed in the constriction structure, and will be forced to increase the amount of airflow flowing downward, thereby ensuring full contact between the airflow and the heat dissipation assembly on this side, quickly conducting heat out of the air outlet, increasing the wind speed flowing upward, and thereby reducing the eddy current loss caused by the airflow separation at the upper end of the transformer.

[0015] As a further solution of the present invention: the guide assembly includes a guide wall and a plurality of guide plates, the arc-shaped guide surface of the guide wall extends toward the side wall of the guide cover opposite to the air inlet, and the plurality of guide plates are used to guide the airflow toward the air outlet. The guide wall serves as an arc-shaped main structure for guiding the airflow toward the side wall of the guide cover, and the guide plate serves as an additional structure for guiding part of the airflow toward the air outlet. The airflow flowing toward the side wall of the guide cover opposite to the air inlet is guided to the heat dissipation assembly on the side of the transformer facing away from the air inlet, and the airflow flowing vertically toward the air outlet can act on other heat dissipation assemblies except the side opposite to the air inlet.

[0016] As a further solution of the present invention: the guide plate extends on the guide wall along the central axis of the air inlet pipe, and the gap size between adjacent guide plates decreases successively in the direction away from the air inlet pipe. When the airflow enters between the guide plates, the airflow flowing along the surface of the guide wall will be decompressed in the constriction structure, and part of the airflow is forced to leave the guide wall and flow toward the air outlet, thereby forming a vertically flowing airflow. The constriction diversion method ensures that the airflow flowing along the guide wall will not encounter the laterally protruding forced guide structure, thereby reducing the risk of turbulence formation. Since the diversion process is continuous and uninterrupted, the uniformity of airflow distribution is improved.

[0017] As a further solution of the present invention, the guide plate and / or the guide wall are made of a sound-absorbing material. When the guide wall and the guide plate redirect the airflow, the noise of the airflow can be effectively absorbed, thereby reducing the propagation of the noise.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In addition to acting on the heat dissipation components on the transformer surface opposite to the air inlet, the airflow input from the air inlet pipe will flow to the top of the air deflector in a vertically downward direction and to the side wall of the air deflector opposite to the air inlet under the action of the air deflector, thereby evenly directing the airflow to the heat dissipation components on the other side of the transformer surface. The airflow flowing vertically downward to the air outlet is consistent with the direction of the gap between the heat dissipation components, so that the airflow flows stably and acts on the entire surface of the heat dissipation components. The guiding effect makes the airflow flow path relatively clear, and effectively diffuses the airflow evenly to all sides of the transformer, improving the heat dissipation uniformity of the heat dissipation components. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 It is the overall structural schematic diagram of the transformer cooling device;

[0022] Figure 2 The airflow path layout diagram of the transformer cooling device;

[0023] Figure 3 This is a schematic structural diagram of the flow guide assembly provided by the present invention.

[0024] In the figure: 1. air deflector; 11. air inlet; 12. air outlet; 13. air deflector assembly; 131. air deflector wall; 132. air deflector plate; 2. heat dissipation assembly; 21. heat dissipation fins; 3. air inlet duct; 31. first air deflector duct; 32. second air deflector duct; 33. arc-shaped guide plate; 4. transformer. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0026] Obviously, the drawings described below are only some examples or embodiments of the present invention. For ordinary technicians in this field, the present invention can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed by the present invention, some changes in design, manufacturing or production based on the technical content disclosed by the present invention are just conventional technical means, and should not be understood as insufficient content disclosed by the present invention.

[0027] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present invention and are not intended to limit the subject matter described in the claims.

[0028] See also Figure 1-Figure 2As shown, in an embodiment of the present invention, a transformer cooling device includes a shroud 1, a heat dissipation assembly 2, and an air inlet pipe 3. The shroud 1 includes an air inlet 11 arranged on the side wall, an air outlet 12 arranged on the bottom wall, and a shroud assembly 13 arranged on the top wall. The shroud 13 is used to guide the airflow to the air outlet 12 and the side wall of the shroud 1 opposite to the air inlet 11. A transformer 4 is arranged in the shroud 1. The heat dissipation assembly 2 is arranged on the periphery of the transformer 4.

[0029] The air inlet pipe 3 is connected to the air inlet 11, and the negative pressure generated by the external fan sucks in the airflow and transports it into the air guide cover 1. The heat dissipation component 2 is used to conduct the internal heat of the transformer 4 to the outside of the transformer 4. The airflow flows in the air guide cover 1 and contacts the heat dissipation component 2, takes away the heat on the surface of the heat dissipation component 2 and outputs it through the air outlet 12. Specifically, on the one hand, the input airflow takes away the surface heat of the heat dissipation component 2 opposite to the air inlet 11, and on the other hand, through the guiding effect of the air guide component 13 on the top of the air guide cover 1, the airflow flows to the heat dissipation component 2 on the other side of the transformer 4 and takes away the heat. The air guide cover 1 realizes the guidance and uniform distribution of the cooling airflow inside the air guide cover 1 through the air guide component 13. It ensures the uniform distribution of the cooling airflow on all sides of the transformer 4, eliminates the local overheating phenomenon, improves the efficiency and uniformity of the heat dissipation of the transformer 4, and thus enhances the working stability and service life of the transformer 4.

[0030] The airflow entering the air guide cover 1 is divided into two parts through the air inlet duct 3: the first air guide duct 31 guides the airflow to the heat dissipation component 2 opposite to the air inlet 11, and the second air guide duct 32 guides the airflow to the air guide component 13. The flow diversion design of the first air guide duct 31 and the second air guide duct 32 effectively guides the airflow to different areas, and the airflow flow rate can be distributed by limiting the cross-sectional area of ​​each air guide duct, thereby optimizing the airflow path and avoiding the phenomenon of airflow concentration and unevenness.

[0031] The arc guide plate 33 in the air inlet duct 3 divides the airflow into two independent paths, respectively directing the airflow to the heat dissipation component 2 and the guide component 13. The guiding surface of the arc guide plate 33 extends in the direction of the guide component 13 to ensure that the guiding direction of the airflow is stable and uniform.

[0032] The heat dissipation assembly 2 is composed of a plurality of heat dissipation fins 21, which are arranged in a horizontal direction in sequence and spaced apart to form a channel for airflow to pass through. The airflow flows from top to bottom, smoothly passes through the gaps between the heat dissipation fins 21, and fully contacts the fin surface to take away the heat. The design of the spaced arrangement of the heat dissipation fins 21 minimizes the obstruction of the airflow, ensures that the airflow contacts the fins in full section, reduces the formation of turbulence, optimizes the heat dissipation process, and ensures the heat dissipation uniformity of the transformer 4.

[0033] In one embodiment, the transformer 4 is an oil-immersed transformer, the heat sink 21 is a plate-type radiator, and the heat sink 21 is connected with an oil passage. The bottom of the transformer 4 is connected to the heat sink 21 through a lower oil collecting pipe, and the top of the transformer 4 is connected to the heat sink 21 through an upper oil collecting pipe. The transformer oil circulates through temperature difference and density difference, specifically, it flows upward in the transformer 4, enters the oil passage of the heat sink 21 through the upper oil collecting pipe, and after the heat sink 21 exchanges heat with the cooling airflow, the oil temperature in the oil passage decreases and drops to enter the lower oil collecting pipe, and then returns to the inside of the transformer 4 through the lower oil collecting pipe.

[0034] The heat dissipation components 2 are arranged on the four sides of the transformer 4, and the output end of the air inlet pipe 3 is trumpet-shaped, so that the airflow can be evenly distributed to the four heat dissipation components 2. After the airflow is expanded through the trumpet mouth, the airflow speed is reduced to ensure that the cooling airflow evenly covers the four sides of the transformer 4.

[0035] On the heat dissipation assembly 2 on the side opposite to the transformer 4 and the air inlet pipe 3, the gap size of the heat dissipation fins 21 gradually increases from top to bottom in the vertical direction. This structure optimizes the flow path of the airflow. After the airflow enters the heat dissipation fins 21, the airflow flowing upward first enters the narrow gap area at the top. In this area, the airflow resistance increases and the flow rate decreases. The airflow as a whole is forced to increase the flow through the lower gap. As the airflow flows downward, the gap size gradually increases, and the airflow velocity decreases appropriately, so that the airflow is fully in contact with the surface of the heat dissipation fins 21, thereby improving the heat dissipation effect and avoiding the phenomenon of poor heat dissipation at the bottom of the heat dissipation assembly 2. At the same time, the airflow velocity at the top is increased, the vortex phenomenon caused by the separation of the upper airflow is weakened, and the noise generation is reduced.

[0036] See also Figure 1-Figure 3 As shown, the guide assembly 13 includes a guide wall 131 and a guide plate 132. The arc-shaped guide surface of the guide wall 131 guides the airflow to flow toward the side wall of the guide cover 1, so as to guide the airflow to the heat dissipation assembly 2 on the side of the transformer 4 facing away from the air inlet 11. The guide plate 132 guides the airflow to the direction of the air outlet 12. The guide assembly 13 effectively guides the airflow to each heat dissipation assembly 2, avoids irregular flow of the airflow, ensures that the airflow covers different areas of the transformer 4, and optimizes the airflow distribution path.

[0037] In one embodiment, the guide plates 132 are a plurality of arc-shaped plates distributed on the guide wall 131, and the arc-shaped plates extend on the guide wall 131 along the radial direction of the air inlet 11, and the arc-shaped guiding surface of the arc-shaped plates faces the airflow direction. The arc-shaped plates are arranged at intervals, so that part of the airflow can flow through the gaps between the guide plates 132 to the side wall of the air guide cover 1, and part of the airflow flows toward the air outlet 12 under the forced obstruction of the arc-shaped plates. Although this structure can guide the airflow in different paths, since the arc-shaped plates are arranged at multiple points and the arrangement positions are fixed, the position of the airflow guided downward is fixed, forming a local circulation area, which in turn leads to insufficient heat dissipation uniformity.

[0038] In one embodiment, the guide plates 132 are a plurality of arc-shaped plates distributed on the guide wall 131, and the arc-shaped plates extend on the guide wall 131 along the axial direction of the air inlet 11, and the gap size between the guide plates 132 gradually decreases. After the airflow enters between the guide plates 132, the flow rate will be reduced under the constriction structure and it will be forced to partially detach from the guide wall 131 and flow toward the air outlet 12, thereby forming a vertical airflow. Since the constriction structure can be continuous, the airflow flowing in the vertical direction can also be continuous, so the uniformity of the airflow distribution is improved, turbulence is not easy to occur, and the flow rate of the airflow detached from a certain place can be enhanced by controlling the slope of the constriction, such as the upper part of the heat dissipation component 2, so that the flow path adjustment is more flexible and controllable.

[0039] The guide plate 132 and the guide wall 131 are made of sound-absorbing materials. When the airflow passes through the guide assembly 13, the airflow contacts the sound-absorbing materials, absorbs part of the airflow noise, and reduces the propagation of the noise. The sound-absorbing materials can be foam metal, porous ceramics, sound-absorbing glass, gypsum board, glass wool, etc.

[0040] It should be noted that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present invention are all included in the technical scope of the present invention. In addition, without departing from the scope of the main purpose of the present invention, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present invention.

Claims

1. A transformer cooling device, characterized in that: include: A flow guide cover (1), comprising an air inlet (11) arranged on a side wall, an air outlet (12) arranged on a bottom wall, and a flow guide assembly (13) arranged on a top wall, the flow guide assembly (13) being used to guide airflow to the air outlet (12) and to the side wall of the flow guide cover (1) opposite to the air inlet (11), wherein a transformer (4) is arranged in the flow guide cover (1); A heat dissipation component (2), wherein the heat dissipation component (2) is arranged on the periphery of the transformer (4); An air inlet pipe (3), wherein the air inlet pipe (3) is connected to the air inlet port (11).

2. A transformer cooling device according to claim 1, characterized in that: The air inlet duct (3) comprises a first air guide duct (31) and a second air guide duct (32); the first air guide duct (31) is used to guide the airflow to a heat dissipation component (2) arranged opposite to the air inlet (11); and the second air guide duct (32) is used to guide the airflow to the guide component (13).

3. A transformer cooling device according to claim 2, characterized in that: An arc-shaped guide plate (33) is arranged in the air inlet pipe (3), and a first air guide pipe (31) and a second air guide pipe (32) are formed by the isolation of the arc-shaped guide plate (33), and the arc-shaped guide surface of the arc-shaped guide plate (33) extends toward the direction of the guide assembly (13).

4. A transformer cooling device according to claim 1, characterized in that: The heat dissipation assembly (2) comprises a plurality of heat dissipation fins (21), and the plurality of heat dissipation fins (21) are arranged in sequence and at intervals in the horizontal direction of the transformer (4).

5. A transformer cooling device according to claim 4, characterized in that: The four side circumferences of the transformer (4) are all provided with heat dissipation components (2), and the output end of the air inlet pipe (3) is in the shape of a trumpet with the diameter extending from small to large.

6. A transformer cooling device according to claim 4, characterized in that: On the heat dissipation component (2) on the side opposite to the transformer (4) and the air inlet pipe (3), the gap size between adjacent heat dissipation fins (21) on the heat dissipation component (2) increases sequentially from top to bottom in the vertical direction.

7. The transformer cooling device according to claim 1, characterized in that: The guide assembly (13) comprises a guide wall (131) and a plurality of guide plates (132); the arc-shaped guide surface of the guide wall (131) extends toward the side wall of the guide cover (1) on the side opposite to the air inlet (11); and the plurality of guide plates (132) are used to guide the airflow toward the direction of the air outlet (12).

8. A transformer cooling device according to claim 7, characterized in that: The guide plates (132) extend on the guide wall (131) along the central axis direction of the air inlet pipe (3), and the gap size between adjacent guide plates (132) decreases in a direction away from the air inlet pipe (3).

9. A transformer cooling device according to claim 7, characterized in that: The guide plate (132) and / or the guide wall (131) are made of sound-absorbing material.

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