Water distribution box and cooling fan

Abstract

This invention provides a water distribution box and a cooling fan. The water distribution box includes: a main body having a receiving tank, an inlet, and an outlet. The inlet is connected to the receiving tank to allow water to enter the tank. The outlet is also connected to the receiving tank to allow water in the tank to flow to the evaporative cooling pad structure. The main body also has a drain outlet connected to the receiving tank. The outlet is inclined relative to the horizontal plane and is higher than the inlet. The drain outlet is located between the top and bottom of the outlet. This invention solves the problem of poor evaporative cooling effect of existing cooling fans.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and more specifically, to a water distribution box and a cooling fan. Background Technology

[0002] Evaporative cooling fans are widely used in homes, greenhouses, livestock sheds, high-temperature workshops, theaters, and other places. Compared with existing air conditioning equipment, evaporative cooling fans have many advantages such as low cost, low energy consumption, simple operation, and reliable operation, making them very popular with consumers. The operation of an evaporative cooling fan can be simply described as follows: a water pump draws water into a distribution box at the top of the evaporative cooling pad, and the water is then sprayed onto the top of the pad through the drain holes at the bottom of the distribution box. As the water flows downwards, it forms a wet film on the surface of the pad. The rotating fan blades generate air pressure, and hot air passing through the pad accelerates the evaporation of the wet film. The sensible heat of the hot air is converted into latent heat, lowering the dry-bulb temperature and achieving a cooling effect.

[0003] Currently, the evaporation rate of most air coolers is around 500 ml / h, which translates to approximately 10 ml per minute. However, the water pumps in existing air coolers typically supply water at a flow rate exceeding 600 ml / min, meaning the water flow supplied to the evaporative cooling pads far exceeds the required flow rate for evaporation. Previous research has shown that reducing the water pump flow rate to the evaporative cooling pads within a certain range can effectively improve the evaporative cooling effect of air coolers.

[0004] Furthermore, previous research revealed that a higher liquid flow rate on the evaporative cooling pad results in a smaller interface between the gas and vapor phases, leading to greater flow resistance. Our design goal is to ensure that the liquid film covers the exposed surface of the evaporative cooling pad within each unit channel, while maintaining a moderate film thickness to prevent severe liquid pooling at the joints of the pad sections. This maximizes the effective evaporation area and effectively reduces the pad's flow resistance. In other words, properly controlling the water flow rate on the evaporative cooling pad can effectively improve the evaporative cooling effect of the evaporative cooling fan.

[0005] However, currently, there is no direct use of a small-flow water pump to supply water to the evaporative cooling pads, with the water volume controlled directly by the pump flow rate. There are two main reasons for this: First, the pump flow rate and head height are directly related; a low flow rate results in a low pump head, which cannot meet the height design requirements of existing evaporative cooling units. Second, if the water flow rate is too low, the water cannot be evenly distributed to all parts of the evaporative cooling pad through the drain holes in the water distribution box above it. The size of the drain holes is designed to be specific, generally around 2mm x 2mm; if they are too small, they will easily become clogged and prevent water from draining. Summary of the Invention

[0006] The main objective of this invention is to provide a water distribution box and a cooling fan to solve the problem of poor evaporative cooling effect of existing cooling fans.

[0007] To achieve the above objectives, according to one aspect of the present invention, a water distribution box is provided, comprising: a water distribution box body having a receiving tank, an inlet and an outlet, the inlet being connected to the receiving tank to allow water to enter the receiving tank through the inlet; the outlet being connected to the receiving tank to allow water in the receiving tank to flow through the outlet to a wet curtain structure; the water distribution box body also having a drain outlet connected to the receiving tank; wherein the outlet is inclined relative to the horizontal plane, the outlet is higher than the inlet, and the drain outlet is located between the top and bottom of the outlet.

[0008] Furthermore, the main body of the water distribution box also has a water inlet channel, the first end of which extends to the wall of the receiving tank to form a water outlet, and the second end of which is used to draw water into the wet curtain structure.

[0009] Furthermore, the water intake channel includes a first channel segment and a second channel segment, which are sequentially connected from the first end to the second end of the water intake channel. The end of the first channel segment away from the second channel segment is the first end of the water intake channel, and the end of the second channel segment away from the first channel segment is the second end of the water intake channel. The first channel segment extends horizontally, and the second channel segment is inclined downward from the first end to the second end of the water intake channel.

[0010] Furthermore, the water inlet channel is inclined downwards from its first end to its second end.

[0011] Furthermore, the main body of the water distribution box has multiple water inlet channels, which are spaced apart along a first preset direction; the main body of the water distribution box also has a drain hole, and the second end of each water inlet channel is connected to the drain hole so that the water in the receiving channel flows sequentially through the water inlet channel and the drain hole to the wet curtain structure; wherein, the drain hole is a strip-shaped hole, which extends along the first preset direction.

[0012] Furthermore, the inlet and outlet are arranged on opposite sides of multiple water intake channels in a first preset direction.

[0013] Furthermore, the minimum height difference between the top of the drain outlet and the top of the outlet is greater than or equal to 10 mm.

[0014] Furthermore, the minimum height difference between the bottom of the drain outlet and the top of the inlet is greater than or equal to 10 mm.

[0015] Furthermore, the width of the water inlet channel is greater than or equal to 2 mm.

[0016] Furthermore, the inlet is located at the bottom of the receiving tank; and / or, the bottom of the receiving tank is provided with a protruding part, and the drain outlet is located on the protruding part.

[0017] According to another aspect of the present invention, a cooling fan is provided, including a water distribution box and a wet curtain structure, wherein the water distribution box is the water distribution box described above.

[0018] Furthermore, the evaporator also includes: a water tank; a water pump, the inlet of which is connected to the water tank, and the outlet of which is connected to the inlet of the water distribution box; wherein the outlet of the water distribution box is connected to the water tank.

[0019] Applying the technical solution of this invention, the water distribution box includes a main body with a receiving tank. Water enters the receiving tank through the inlet, and the water level in the receiving tank continuously rises. When the water level is higher than the bottom of the outlet, the water flows from the receiving tank to the outlet and then to the wet curtain structure of the cooling fan. Since the water inlet speed is greater than the water outlet speed, the water level continues to rise. When the water level in the receiving tank is higher than the drain outlet, the water above the drain outlet will be diverted and discharged from the drain outlet, and the water level stops rising. This ensures that the water level in the receiving tank is only between the top of the outlet and the drain outlet, so that the water in the receiving tank can only flow to the wet curtain structure through the outlet and cannot exceed the top of the outlet. This ensures that the water flowing onto the wet curtain is uniform and appropriate. The water distribution box of this invention effectively improves the evaporative cooling effect of the cooling fan by reasonably controlling the water flow on the wet curtain cloth, thereby solving the problem of poor evaporative cooling effect of the cooling fan in the prior art. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 An isometric view of an embodiment of the water distribution box according to the present invention is shown;

[0022] Figure 2 A schematic diagram of the water inlet channel of the water distribution box according to the present invention is shown;

[0023] Figure 3 A top view of an embodiment of the water distribution box according to the present invention is shown;

[0024] Figure 4 It shows Figure 3 A magnified view of a portion of point B in the middle;

[0025] Figure 5 A cross-sectional view of an embodiment of the water distribution box according to the present invention is shown.

[0026] The above figures include the following reference numerals:

[0027] 10. Main body of water distribution box; 11. Receiving tank; 111. Protrusion; 12. Water inlet; 13. Water guide channel; 131. First channel section; 132. Second channel section; 14. Drain hole; 15. Drain outlet; 16. Water outlet. Detailed Implementation

[0028] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] This invention provides a water distribution box; please refer to [the relevant documentation]. Figures 1 to 5 The system includes: a water distribution box body 10, having a receiving tank 11, a water inlet 12, and a water outlet 16. The water inlet 12 is connected to the receiving tank 11 to allow water to enter the receiving tank 11 through the water inlet 12. The water outlet 16 is connected to the receiving tank 11 to allow water in the receiving tank 11 to flow to the wet curtain structure through the water outlet 16. The water distribution box body 10 also has a drain outlet 15, which is connected to the receiving tank 11. The water outlet 16 is inclined relative to the horizontal plane and is set higher than the water inlet 12. The drain outlet 15 is located between the top and bottom of the water outlet 16.

[0030] The water distribution box of the present invention includes a main body 10 with a receiving tank 11. Water enters the receiving tank 11 through the inlet 12. The water level in the receiving tank 11 continues to rise. When the water level is higher than the bottom of the outlet 16, the water will flow out of the outlet 16 and then flow to the wet curtain structure. Since the water inlet speed of the inlet 12 is greater than the water outlet speed of the outlet 16, the water level continues to rise. When the water level in the receiving tank 11 is higher than the drain outlet 15, the water above the drain outlet 15 will be diverted and discharged from the drain outlet 15, and the water level will stop rising. This ensures that the water level in the receiving tank 11 is only between the top of the outlet 16 and the drain outlet 15, so that the water in the receiving tank 11 can only flow to the wet curtain structure through the outlet 16 and cannot go over the top of the outlet 16. This ensures that the water flowing onto the wet curtain is uniform and appropriate. The water distribution box of the present invention effectively improves the evaporative cooling effect of the evaporative cooling fan by reasonably controlling the water flow on the wet curtain cloth, thereby solving the problem of poor evaporative cooling effect of the evaporative cooling fan in the prior art.

[0031] Alternatively, the water distribution box of the present invention can also be used in the field of humidifiers.

[0032] In this embodiment, the main body 10 of the water distribution box also has a water inlet trough 13. The first end of the water inlet trough 13 extends to the wall of the receiving trough 11 to form a water outlet 16, and the second end of the water inlet trough 13 is used to draw water to the wet curtain structure.

[0033] Specifically, when the water level is higher than the bottom of the water inlet trough 13, the water will flow from the outlet 16 to the second end of the water inlet trough 13, and then to the wet curtain structure of the cooling fan.

[0034] In this embodiment, the water intake channel 13 includes a first channel segment 131 and a second channel segment 132. The first channel segment 131 and the second channel segment 132 are sequentially connected from the first end to the second end of the water intake channel 13. The end of the first channel segment 131 away from the second channel segment 132 is the first end of the water intake channel 13, and the end of the second channel segment 132 away from the first channel segment 131 is the second end of the water intake channel 13. The first channel segment 131 extends horizontally, and the second channel segment 132 is inclined downward from the first end to the second end of the water intake channel 13.

[0035] Specifically, when the water level in the receiving tank 11 is higher than the bottom of the first end of the water inlet trough 13, the water will flow from the first end of the water inlet trough 13 through the first trough section 131 and the second trough section 132 in sequence. The second trough section 132 is inclined downward from the first end to the second end of the water inlet trough 13, so that the water can flow more easily from the first end of the water inlet trough 13 to the second end of the water inlet trough 13.

[0036] In other embodiments, not shown in the figures, the water inlet trough 13 is inclined downwards from its first end to its second end. This arrangement makes it easier for water to flow from the first end of the water inlet trough 13 to the second end of the water inlet trough 13, further enhancing the water inlet effect of the water inlet trough 13.

[0037] In this embodiment, the water distribution box body 10 has multiple water inlet channels 13, which are spaced apart along a first preset direction; the water distribution box body 10 also has a drain hole 14, and the second end of each water inlet channel 13 is connected to the drain hole 14 so that the water in the receiving tank 11 flows sequentially through the water inlet channel 13 and the drain hole 14 to the wet curtain structure; wherein, the drain hole 14 is a strip-shaped hole, which extends along the first preset direction.

[0038] In practice, the first preset direction is Figure 2 The multiple water channels 13 spaced vertically in the middle further enhance the water-guiding effect of the water channels 13, helping to guide the water in the receiving tank 11 to the drain hole 14, and the multiple water channels 13 can improve the uniformity of drainage; the strip-shaped drain hole 14 further enhances the drainage effect of the drain hole 14, helping the water in the drain hole 14 to flow to the wet curtain structure of the air cooler. In addition, the combination of water channels 13 and strip-shaped holes can replace the function of the original drain hole, eliminating the small drain hole, which can effectively avoid the problem of drain hole blockage due to dirt after long-term use.

[0039] In this embodiment, the water inlet 12 and the drain outlet 15 are arranged on opposite sides of the plurality of water guide channels 13 in a first preset direction. This arrangement ensures that the water flowing in from the water inlet 12 will flow out through the drain outlet 15 after passing through the water guide channel 13. This prevents the water flowing in from the water inlet 12 from being unable to be guided to the drain hole 14 by the water guide channel 13, or from having too little water guided to the drain hole 14, which would result in too little water flowing to the wet curtain structure of the cooling fan and affect the evaporative cooling effect of the cooling fan.

[0040] In this embodiment, the minimum height difference between the top of the drain outlet 15 and the top of the outlet 16 is greater than or equal to 10mm. This setting prevents the minimum height between the top of the drain outlet 15 and the top of the outlet 16 from being too small, which would cause the water level in the receiving tank 11 to rise above the drain outlet 15 for too long, and the water in the receiving tank 11 could not be discharged in time. This would make it easy for the water level in the receiving tank 11 to exceed the top of the outlet 16, resulting in an excessive amount of water flowing from the outlet 16 to the drain hole 14, which would affect the evaporative cooling effect of the cooling fan.

[0041] In this embodiment, the minimum height difference between the bottom of the drain outlet 15 and the top of the inlet 12 is greater than or equal to 10mm. This setting prevents the minimum height difference between the bottom of the drain outlet 15 and the top of the inlet 12 from being too small, which would cause the water flowing in from the inlet 12 to easily flow directly out of the drain outlet 15 and no longer flow through the water inlet 13, or the amount of water flowing through the water inlet 13 to be too small, which would cause the amount of water flowing from the water inlet 13 to the drain hole 14 to be too small, thus affecting the evaporative cooling effect of the air cooler.

[0042] In this embodiment, the width of the water inlet trough 13 is greater than or equal to 2mm. This design ensures the water inlet effect of the water inlet trough 13, preventing insufficient water flow from the water inlet trough 13 to the drain hole 14, which would affect the evaporative cooling effect of the air cooler. It also avoids the problem of the water inlet trough 13 becoming clogged with dirt after long-term use. The width direction of the water inlet trough 13 is... Figure 2 The up and down directions in the middle.

[0043] In this embodiment, the water inlet 12 is located at the bottom of the receiving tank 11; and / or, the bottom of the receiving tank 11 is provided with a protrusion 111, and the drain outlet 15 is located on the protrusion 111. This arrangement prevents water flowing in from the water inlet 12 from flowing directly out from the drain outlet 15, thereby reducing the amount of water flowing onto the wet curtain.

[0044] The present invention also provides a cooling fan, including a water distribution box and a wet curtain structure, wherein the water distribution box is the water distribution box in the above embodiment.

[0045] The air cooler of the present invention includes a water distribution box and a wet curtain structure as described in the above embodiments. The water distribution box includes a main body 10 with a receiving groove 11. Water enters the receiving groove 11 through the water inlet 12, and the water level in the receiving groove 11 continuously rises. When the water level is higher than the bottom of the water outlet 16, the water will flow from the water outlet 16 to the second end of the water guide groove 13, and then flow into the drain hole 14 and then into the wet curtain structure of the air cooler. Since the water inlet speed of the water inlet 12 is greater than the water outlet speed of the water outlet 16, the water level continues to rise. When the water level in the receiving groove 11 is higher than the drain outlet 15, Water above the drain outlet 15 will be diverted and discharged from the drain outlet 15, and the water level will stop rising. This ensures that the water level in the receiving tank 11 is only between the top of the outlet 16 and the drain outlet 15, so that the water in the receiving tank 11 can only flow to the wet curtain structure through the drain hole 14 and cannot go over the top of the outlet 16. This ensures that the water flowing onto the wet curtain is uniform and appropriate. The water distribution box of the present invention effectively improves the evaporative cooling effect of the air cooler by reasonably controlling the water flow on the wet curtain cloth, thereby solving the problem of poor evaporative cooling effect of the air cooler in the prior art.

[0046] In this embodiment, the cooling fan further includes: a water tank; a water pump, the inlet of which is connected to the water tank, and the outlet of which is connected to the inlet 12 of the water distribution box; wherein the outlet 15 of the water distribution box is connected to the water tank.

[0047] In practice, the water inlet 12 is connected to the cooling fan water pump. The water pump draws water from the water tank and enters the receiving tank 11 through the water inlet 12. Because the wet curtain structure requires less water, most of the water supplied by the water pump flows back to the water tank through the drain outlet 15 for recycling, which helps to save water.

[0048] In practical implementation, the cooling fan water distribution box of the present invention limits the highest water level in the receiving tank 11 by controlling the height of the drain outlet 15, and limits the lowest water level in the distribution box by controlling the height of the bottom of the water inlet trough 13. The height of the drain outlet 15 is between the top and bottom of the outlet 16. When the water pump pumps water and the water level in the receiving tank 11 is higher than the bottom of the outlet 16, the water will flow from the water inlet trough 13 to the drain hole 14. Since the width of the water inlet trough 13 is small, the water flow is slow. The water pumping speed is greater than the water flow speed of the water inlet trough 13, and the water level continues to rise. When the water level in the receiving tank 11 is higher than that in the drain outlet 15, the water above the drain outlet 15 will be diverted and discharged from the drain outlet 15, stopping the water level rise. This ensures that the water level in the receiving tank 11 is between the top of the outlet 16 and the drain outlet 15, and the water can only flow down to the drain hole 14 through the water inlet 13, unable to exceed the top of the outlet 16. This allows for a continuous, uniform, and appropriate flow of water onto the evaporative cooling pad, ensuring that the liquid film on the surface of the evaporative cooling pad covers the exposed surface of the structure. Simultaneously, the thickness of the liquid film is moderate, guaranteeing optimal evaporation efficiency for the evaporative cooling pad. The combination of the water inlet 13 and the drain hole 14 can replace the function of the drain hole, eliminating the need for a smaller drain hole and effectively preventing the problem of the drain hole becoming clogged due to dirt over long-term use. The water distribution box and cooling fan of the present invention achieve balanced and appropriate control of the water flow from the wet curtain by combining the drain outlet 15, water inlet 13, water outlet 16 and drain hole 14 in the water distribution box, so that the wet curtain is in a better evaporation efficiency, which can effectively improve the evaporative cooling effect of the cooling fan, thereby solving the problem of poor mass and heat transfer between water and air and poor evaporative cooling effect of the cooling fan.

[0049] In practice, the water inlet 12 is connected to the cooling fan water pump. The water pump draws water from the water tank and enters the receiving tank 11 through the water inlet 12. The water level in the receiving tank 11 continues to rise. When the water level is higher than the bottom of the outlet 16, the water will flow out along the water inlet 13 and into the drain hole 14. Because the water inlet trough 13 is narrow and the drainage is slow, the water pump's pumping speed is greater than the drainage speed of the water inlet trough 13. The water inlet trough 13 can only divert a portion of the water, so the water level in the distribution box continues to rise. When the water level rises above the drain outlet 15, the remaining water that cannot be diverted by the water inlet trough 13 will be discharged from the drain outlet 15, and the water level will stop rising. Since the wet curtain requires less water, most of the water supplied by the pump flows back to the water tank for recycling through the drain outlet 15. The outlet 16 is higher than the drain outlet 15. Because the water level cannot rise due to the diversion effect of the water inlet trough and the drain outlet 15, it cannot overflow the top of the outlet 16. Therefore, the highest water level in the distribution box will be lower than the top of the outlet 16 and can only flow down to the drain hole 14 through the water inlet trough. Since the size of the drain hole 14 is much larger than the size of the water inlet trough, it prevents the accumulation of impurities in the water from causing blockages during long-term use. The size of the drain outlet 15 depends on the amount of water required by the evaporative cooling pad. The amount of water diverted by the water inlet trough 13 can be controlled by changing the diameter of the drain outlet 15. Only water with a water level higher than the bottom of the outlet 16 can be diverted through the water inlet trough 13 to the drain hole 14 and then to the evaporative cooling pad. This achieves balanced and appropriate control of the water flow from the evaporative cooling pad, ensuring that the liquid film thickness on the surface of the evaporative cooling pad is moderate, so that the evaporative cooling pad has the best evaporation efficiency and can effectively improve the evaporative cooling effect of the evaporative cooling fan.

[0050] In practice, after the evaporator is turned on for humidification, the water pump draws water from the water tank, which enters the water distribution box through the inlet 12. The water level in the distribution box then rises. When the water level exceeds the bottom of the outlet 16, it flows down the water inlet 13 to the drain hole 14 and onto the evaporative cooling pad. Water that has not completely evaporated after passing through the evaporative cooling pad flows back into the water tank. Because the water pump's pumping speed is greater than the water flow rate through the water inlet 13, the water level continues to rise. When the water level rises above the drain outlet 15, the remaining water that cannot be drawn away by the water inlet 13 will be discharged from the drain outlet 15 and flow back into the water tank, stopping the water level from rising.

[0051] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0052] The water distribution box of the present invention includes a main body 10 with a receiving tank 11. Water enters the receiving tank 11 through the inlet 12, and the water level in the receiving tank 11 continuously rises. When the water level is higher than the bottom of the outlet 16, the water will flow from the outlet 16 to the second end of the water inlet 13, and then flow into the drain hole 14 and then into the wet curtain structure of the cooling fan. Since the water inlet speed of the inlet 12 is greater than the water outlet speed of the outlet 16, the water level continues to rise. When the water level in the receiving tank 11 is higher than the drain outlet 15, the water above the drain outlet 15 will... The water is diverted from the drain outlet 15, and the water level stops rising. This ensures that the water level in the receiving tank 11 is only between the top of the outlet 16 and the drain outlet 15. As a result, the water in the receiving tank 11 can only flow to the wet curtain structure through the drain hole 14 and cannot go over the top of the outlet 16. This ensures that the water flowing onto the wet curtain is uniform and in appropriate quantity. The water distribution box of this invention effectively improves the evaporative cooling effect of the air cooler by reasonably controlling the water flow on the wet curtain cloth, thereby solving the problem of poor evaporative cooling effect of the air cooler in the prior art.

[0053] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A water distribution box, characterized in that, include: The main body (10) of the water distribution box has a receiving tank (11), a water inlet (12) and a water outlet (16). The water inlet (12) is connected to the receiving tank (11) so that water enters the receiving tank (11) through the water inlet (12); the water outlet (16) is connected to the receiving tank (11) so that the water in the receiving tank (11) flows to the wet curtain structure through the water outlet (16). The main body (10) of the water distribution box also has a drain outlet (15), which is connected to the receiving tank (11); The outlet (16) is inclined relative to the horizontal plane, the outlet (16) is higher than the inlet (12), and the drain (15) is located between the top and bottom of the outlet (16). The main body (10) of the water distribution box also has a water inlet channel (13), the first end of the water inlet channel (13) extends to the wall of the receiving tank (11) to form the water outlet (16), and the second end of the water inlet channel (13) is used to draw water to the wet curtain structure. The water intake channel (13) includes a first channel segment (131) and a second channel segment (132). The first channel segment (131) and the second channel segment (132) are connected sequentially from the first end to the second end of the water intake channel (13). The end of the first channel segment (131) away from the second channel segment (132) is the first end of the water intake channel (13), and the end of the second channel segment (132) away from the first channel segment (131) is the second end of the water intake channel (13). The first trough section (131) extends horizontally, and the second trough section (132) is inclined downward from the first end to the second end of the water inlet trough (13).

2. The water distribution box according to claim 1, characterized in that, The water inlet channel (13) is inclined downward from its first end to its second end.

3. The water distribution box according to claim 1, characterized in that, The main body (10) of the water distribution box has a plurality of water inlet channels (13), which are spaced apart along a first preset direction; the main body (10) of the water distribution box also has a drain hole (14), and the second end of each water inlet channel (13) is connected to the drain hole (14) so ​​that the water in the receiving tank (11) flows through the water inlet channel (13) and the drain hole (14) to the wet curtain structure in sequence; wherein, the drain hole (14) is a strip hole, which extends along the first preset direction.

4. The water distribution box according to claim 3, characterized in that, The inlet (12) and the outlet (15) are arranged on opposite sides of the plurality of water inlet channels (13) in the first preset direction.

5. The water distribution box according to any one of claims 1 to 4, characterized in that, The minimum height difference between the top of the drain outlet (15) and the top of the outlet (16) is greater than or equal to 10 mm.

6. The water distribution box according to any one of claims 1 to 4, characterized in that, The minimum height difference between the bottom of the drain outlet (15) and the top of the inlet (12) is greater than or equal to 10 mm.

7. The water distribution box according to any one of claims 1 to 4, characterized in that, The width of the water inlet channel (13) is greater than or equal to 2 mm.

8. The water distribution box according to any one of claims 1 to 4, characterized in that, The inlet (12) is located at the bottom of the receiving tank (11); and / or, The bottom of the receiving groove (11) is provided with a protruding part (111), and the drain outlet (15) is located on the protruding part (111).

9. A cooling fan, comprising a water distribution box and an evaporative cooling pad structure, characterized in that, The water distribution box is the water distribution box according to any one of claims 1 to 8.

10. The air cooler according to claim 9, characterized in that, The cooling fan also includes: Water tank; A water pump, the inlet of which is connected to the water tank, and the outlet of which is connected to the inlet (12) of the water distribution box; The drain outlet (15) of the water distribution box is connected to the water tank.

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