Fan blade base and centrifugal fan blade

Abstract

This invention provides a fan blade base and a centrifugal fan blade. The fan blade base includes an air inlet section and an air outlet section, with the air outlet section disposed on the air inlet section. The air inlet section has a windward surface and a leeward surface, and grooves are provided on the windward surface and / or the leeward surface. The fan blade base and centrifugal fan blade provided by this invention, by providing grooves on the windward surface and / or the leeward surface, change the roughness of the windward surface and / or the leeward surface, increasing the contact area between the fan blade base and condensate. Therefore, when condensate forms on the base surface, the condensate is less likely to accumulate and flow, reducing the possibility of condensate dripping. Simultaneously, the grooves can also collect condensate, further reducing the problem of condensate dripping and effectively improving user comfort.

Description

Technical Field

[0001] This invention relates to the field of air handling equipment technology, and in particular to a fan blade base and a centrifugal fan blade. Background Technology

[0002] Existing air conditioning equipment uses centrifugal fan blades to drive gas through a heat exchanger for heat exchange. To ensure that all the gas driven by the fan blades passes through the heat exchanger, the fan blades are positioned on one side of the heat exchanger. A drip tray is installed below the heat exchanger to collect condensate. When the air conditioning unit stops, the condensate that hasn't been drained from the drip tray evaporates onto the fan blades. Because the windward and leeward sides of the fan blade base are smooth surfaces, the condensate that forms on them accumulates and drips, causing the air conditioning unit to drip, which seriously affects user experience. Summary of the Invention

[0003] To address the technical problem of condensation dripping from the fan blades and causing water to drip from the indoor unit in existing technologies, a fan blade base and centrifugal fan blade with grooves on the windward and / or leeward sides to suppress the flow of condensate are provided.

[0004] A fan blade base includes an air inlet section and an air outlet section, the air outlet section being disposed on the air inlet section, the air inlet section having a windward side and a leeward side, and grooves being provided on the windward side and / or the leeward side.

[0005] The groove includes a spiral groove, and the spiral axis of the spiral groove is collinear with the central axis of the air inlet section.

[0006] The groove includes multiple annular grooves, all of which are arranged sequentially along the direction close to the air outlet section, and the central axis of the annular grooves is collinear with the central axis of the air inlet section.

[0007] The maximum width R of the groove is in the range of R≤3mm; and / or the depth L of the groove is in the range of L≤2mm.

[0008] The air outlet section has an air guide surface facing the air inlet section, and a guide groove is provided on the air guide surface.

[0009] There are multiple guide channels, and all the guide channels are distributed in a ring on the air outlet section with the central axis of the air inlet section as the axis.

[0010] The fan blade base includes guide ribs, which are disposed on the air outlet section, and a guide groove is formed between two adjacent guide ribs.

[0011] The fan blade base is provided with a fan blade, and the angle formed by the rotation direction of the guide rib and the position of the guide rib is equal to the outlet installation angle of the fan blade; or, the angle formed by the rotation direction of the guide rib and the position of the guide rib is equal to the inlet installation angle of the fan blade.

[0012] The height H of the guide rib has a numerical range of 1mm ≤ H ≤ 3mm.

[0013] A centrifugal fan blade, including the aforementioned fan blade base.

[0014] The fan blade base and centrifugal fan blade provided by the present invention have grooves on the windward and / or leeward surfaces. The grooves change the roughness of the windward and / or leeward surfaces, increasing the contact area between the fan blade base and the condensate. As a result, when condensate is generated on the surface of the base, the condensate is less likely to accumulate and flow, reducing the possibility of condensate flowing and dripping. At the same time, the grooves can also collect the condensate, further reducing the problem of condensate flowing and dripping, effectively improving user comfort. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the fan blade base provided in an embodiment of the present invention;

[0016] Figure 2 A cross-sectional view of the fan blade base provided in an embodiment of the present invention;

[0017] Figure 3 for Figure 2 A partial schematic diagram of point A;

[0018] Figure 4 for Figure 2 A partial schematic diagram of point B;

[0019] Figure 5 A top view of the fan blade base provided in an embodiment of the present invention;

[0020] In the picture:

[0021] 1. Air inlet section; 2. Air outlet section; 11. Windward side; 12. Leeward side; 13. Groove; 21. Guide groove; 22. Guide rib. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0023] Taking a multi-split air conditioning system as an example, each indoor unit in the system can freely switch between different heat exchange modes. When one indoor unit is in cooling mode, condensation will accumulate in its drip tray. When that indoor unit stops cooling and enters standby mode, and the water in its drip tray is not completely drained, when other indoor units turn on heating mode, a small amount of high-temperature refrigerant will still flow in the heat exchanger of the standby indoor unit, resulting in a high internal temperature. Since the indoor unit is in standby mode and its fan blades are not operating, the water in the drip tray will evaporate onto the fan blades and form condensation. Because the windward and leeward sides of the fan blade base are smooth surfaces, the condensation will accumulate and drip, causing the air conditioning equipment to drip water, seriously affecting user use and comfort. Therefore, if... Figures 1 to 5 The fan blade base shown includes an air inlet section 1 and an air outlet section 2. The air outlet section 2 is disposed on the air inlet section 1. The air inlet section 1 has a windward surface 11 and a leeward surface 12. A groove 13 is provided on the windward surface 11 and / or the leeward surface 12. Grooves 13 are provided on the windward side 11 and / or the leeward side 12. The grooves 13 are used to change the roughness of the windward side 11 and / or the leeward side 12. When the droplet is located on the solid surface, it will form a certain angle (i.e., contact angle) with the surface. The rough structure of the surface will enhance the wettability of the surface. The roughness can be represented by the surface roughness factor, which is the ratio of the actual solid-liquid contact area to the geometrically projected solid-liquid contact area. The liquid will fill the grooves 13 on the rough surface. The existence of the rough surface makes the actual solid-liquid contact area larger than the apparent solid-liquid contact area. Therefore, setting the grooves 13 can increase the contact area between the fan base and the condensate. Thus, when condensate is generated on the surface of the base, the condensate is not easy to accumulate and flow, which can reduce the possibility of condensate flowing and dripping. At the same time, the grooves 13 can also collect the condensate, further reducing the problem of condensate flowing and dripping, effectively improving the user's comfort.

[0024] Along the central axis of the base, the base has a top and a bottom, and from the bottom to the top, the edge of the cross section of the base is arc-shaped. Therefore, along the bottom to the top, the curvature of the groove 13 corresponds to the arc of the arc, that is, the curvature of the groove 13 is different along the bottom to the top.

[0025] In one embodiment, the groove 13 includes a spiral groove, the spiral axis of which is collinear with the central axis of the air inlet section 1. The spiral groove ensures reliable collection of condensate while allowing it to flow along the groove, thus dripping at a designated location for easy collection. Preferably, when the fan blades are installed downwards, the air outlet section 2 is located below the air inlet section 1, and the spiral groove spirals outwards from the installation position of the air outlet section 2, further preventing condensate from flowing towards the air outlet section 2.

[0026] In another embodiment (not shown), the groove 13 includes multiple annular grooves, all of which are arranged sequentially along the direction close to the air outlet section 2, and the central axis of the annular grooves is collinear with the central axis of the air inlet section 1. In this case, the condensate collected in the annular grooves can reliably remain within the grooves, further preventing dripping. When the fan blades operate again, the condensate in the annular grooves is carried away by the fan blades and ultimately collected by the drip tray.

[0027] The maximum width R of the groove 13 is in the range of R ≤ 3mm. When the maximum width R of the groove 13 is greater than 3mm, the change in surface roughness caused by the groove 13 is small, its collection effect on condensate is poor, and condensate easily flows out from the groove 13, resulting in dripping from the fan blades. Only when R ≤ 3mm can the condensate collected inside be prevented from flowing out, effectively avoiding the problem of dripping from the fan blades.

[0028] The depth L of the groove 13 is in the range of L≤2mm. When the depth L of the groove 13 is greater than 2mm, condensate will accumulate inside the groove 13 and cannot be discharged, causing a decrease in the reliability of the fan blade. In particular, when the groove 13 is formed by setting ribs on the windward side 11 and / or the leeward side 12, the height of the ribs constitutes the depth L of the groove 13. In order to avoid interference between the ribs and the fan blades, the height of the ribs must be less than or equal to 2mm.

[0029] The air outlet section 2 has an air guide surface facing the air inlet section 1, and a guide groove 21 is provided on the air guide surface. The guide groove 21 can suppress condensation formation, thereby reducing the problem of water dripping from the fan blades. At the same time, the guide groove 21 can also reduce the formation of eddies inside the fan blades, achieving the effect of improving the efficiency and reducing noise of the fan blades.

[0030] Since the air outlet section 2 of the fan blade is annular, there are multiple guide channels 21. All guide channels 21 are distributed in a ring around the central axis of the air inlet section 1 on the air outlet section 2. That is, the guide channels 21 can be evenly distributed on the annular air outlet section 2, thereby guiding the airflow passing through the air outlet section 2 and ensuring the reliable operation of the fan blade.

[0031] Optionally, the fan blade base includes guide ribs 22, which are disposed on the air outlet section 2, and a guide groove 21 is formed between two adjacent guide ribs 22. The guide ribs 22 facilitate the formation of the guide groove 21 on the air outlet section 2, reducing the design and manufacturing complexity of the fan blade base.

[0032] The fan blade is mounted on the fan blade base. The angle between the direction of rotation of the guide rib 22 and its position is equal to the outlet installation angle of the fan blade. The outlet installation angle refers to the angle between the tangent of the airfoil line at the water outlet edge and the direction of rotation of the blade circumference. In this configuration, the guide rib 22 effectively guides the gas flowing out of the guide channel 21, thereby improving the noise reduction effect of the guide channel 21.

[0033] Alternatively, the angle between the guide rib 22 and the rotation direction of the guide rib 22 is equal to the inlet installation angle of the fan blade. The inlet installation angle refers to the angle between the tangent of the blade airfoil at the inlet and the direction of blade circumferential rotation. In this case, the guide rib 22 can effectively guide the gas entering the guide groove 21, thereby improving the noise reduction effect of the guide groove 21.

[0034] The height H of the guide rib 22 is in the range of 1mm ≤ H ≤ 3mm. When the height H of the guide rib 22 is less than 1mm, the depth of the formed guide groove 21 is small and cannot play the role of preventing condensation and reducing noise; while when the height H of the guide rib 22 is greater than 3mm, the guide rib 22 will interfere with the blade and affect the reliability of the wind turbine blade.

[0035] A centrifugal fan blade includes the aforementioned fan blade base. When the water level on the fan blade exceeds a set value, the fan blade can rotate to prevent condensate from dripping, thereby separating the condensate into a drip tray. Preferably, the fan blade rotates at a minimum speed to avoid excessive speed causing condensate to splash.

[0036] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A fan blade base, characterized in that: It includes an air inlet section (1) and an air outlet section (2), the air outlet section (2) being disposed on the air inlet section (1), the air inlet section (1) having a windward surface (11) and a leeward surface (12), and a groove (13) being disposed on the windward surface (11) and / or the leeward surface (12); the groove (13) includes a spiral groove, the spiral axis of the spiral groove being collinear with the central axis of the air inlet section (1), and the spiral groove is used to change the roughness of the windward surface (11) and / or the leeward surface (12) to reduce the flow and dripping of condensate.

2. The fan blade base according to claim 1, characterized in that: The maximum width R of the groove (13) is in the range of R≤3mm; and / or the depth L of the groove (13) is in the range of L≤2mm.

3. The fan blade base according to claim 1, characterized in that: The air outlet section (2) has an air guide surface facing the air inlet section (1), and a guide groove (21) is provided on the air guide surface.

4. The fan blade base according to claim 3, characterized in that: There are multiple guide channels (21), and all the guide channels (21) are distributed in a ring on the air outlet section (2) with the central axis of the air inlet section (1) as the axis.

5. The fan blade base according to claim 3, characterized in that: The fan blade base includes a guide rib (22), which is disposed on the air outlet section (2), and a guide groove (21) is formed between two adjacent guide ribs (22).

6. The fan blade base according to claim 5, characterized in that: The fan blade base is provided with a fan blade, and the angle between the rotation direction of the guide rib (22) and the position of the guide rib (22) is equal to the outlet installation angle of the fan blade; or, the angle between the rotation direction of the guide rib (22) and the position of the guide rib (22) is equal to the inlet installation angle of the fan blade.

7. The fan blade base according to claim 5 or 6, characterized in that: The height H of the guide rib (22) is in the range of 1mm≤H≤3mm.

8. A centrifugal fan blade, characterized in that: Includes the wind turbine base as described in any one of claims 1 to 7.

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