A supercharging impeller and a fan thereof

Abstract

The utility model discloses a kind of booster impeller and fan thereof, including hub, and several blades being set on hub, the blade includes leading edge, trailing edge, outer edge, pressure surface and suction surface, the outer edge end face is provided with groove extending from leading edge to trailing edge, the groove is used to increase the damping of backflow from pressure surface to suction surface. The groove of the utility model by outer edge end face structure can make the backflow flowing through be affected by area change to produce local diffuser, so that backflow velocity is weakened, thereby reduce the pressure loss due to backflow, improve the static pressure and efficiency of fan.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a booster impeller and the fan thereof. Background Technology

[0002] A fan is a machine that uses input mechanical energy to increase gas pressure and discharge gas; it is a type of driven fluid machinery. Existing fans mainly consist of an impeller and a casing. During operation, some airflow will flow back from the gap between the outer edge of the impeller blades and the casing to the suction side (inlet side). This backflow will cause pressure drop loss in the fan, thus affecting its efficiency and performance, and there is room for improvement. Utility Model Content

[0003] The present invention aims to overcome the defects in the prior art by providing a booster impeller and its fan. The groove constructed on the outer edge end face of the blade allows the backflow to be affected by the area change, resulting in local diffusion and weakening of the backflow velocity. This reduces the pressure drop loss caused by the backflow and improves the static pressure and efficiency of the fan.

[0004] To achieve the above objectives, this utility model provides a booster impeller, including a hub and a plurality of blades disposed on the hub. The blades include a leading edge, a trailing edge, an outer edge, a pressure surface, and a suction surface. A groove extending from the leading edge to the trailing edge is provided on the end face of the outer edge. The groove is used to increase the damping of the backflow from the pressure surface to the suction surface.

[0005] The groove is further configured such that its depth first increases and then decreases from the pressure side to the suction side.

[0006] Further configuration: the vertical cross-sectional shape of the groove is a V-shaped structure or an inverted trapezoidal structure.

[0007] The groove is further configured such that its width increases first and then decreases from the front edge to the rear edge.

[0008] The groove is further configured such that its depth first increases and then decreases from the front edge to the rear edge.

[0009] The outer edge is further configured such that it bends from the pressure side to the suction side.

[0010] This utility model also provides a fan, including a casing and the aforementioned impeller.

[0011] Compared with the prior art, the present invention has a simple and reasonable structure. The groove constructed on the outer edge end face of the blade allows the backflow to be affected by the change in area from first increasing to decreasing, resulting in local diffusion and weakening of the backflow velocity. This reduces the pressure drop loss caused by the backflow, thereby improving the static pressure and efficiency of the fan. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of a booster impeller according to the present invention; Figure 2 This is a top view of the booster impeller; Figure 3 This is a schematic diagram of the AA cross-sectional structure of the booster impeller; Figure 4 This is a comparison chart of the static pressure and flow rate of the new type of fan in this patent and existing fans; Figure 5 This is a comparison chart of the efficiency and flow rate of the new fan of this patent and existing fans.

[0013] The following reference numerals are marked on the accompanying drawings: 10. Hub; 20. Blade; 21. Leading edge; 22. Trailing edge; 23. Outer edge; 231. Groove; 24. Pressure surface; 25. Suction surface; W, Width; D, Depth. Detailed Implementation

[0014] The following describes a specific embodiment of the present invention in detail with reference to the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0015] This utility model relates to a booster impeller, such as... Figure 1 , Figure 2 and Figure 3 As shown, the fan includes a hub 10 and several blades 20 arranged around the hub 10. Each blade 20 includes a leading edge 21 and a trailing edge 22 distributed along its rotation direction, and an outer edge 23 connected between the leading edge 21 and the trailing edge 22 and located away from the hub 10. The blade 20 also includes a pressure surface 24 near the outlet side (specifically shown as the lower surface in the figure) and a suction surface 25 near the inlet side (specifically shown as the upper surface in the figure). The end face of the outer edge 23 is provided with a groove 231 extending from the leading edge 21 to the trailing edge 22. The groove 231 causes the gap between the outer edge 23 of the blade 20 and the casing to change with a trend of first increasing and then decreasing, preferably approximately normally distributed. As a result, the backflow through the groove 231 will be affected by the area change and generate local diffusion, which increases the damping of the backflow from the pressure surface 24 to the suction surface 25, reduces the backflow velocity, and thus reduces the pressure drop loss caused by the backflow, thereby improving the static pressure and efficiency of the fan.

[0016] In this embodiment, the depth D of the groove 231 is set to increase first and then decrease from the pressure surface 24 side to the suction surface 25 side. Preferably, the vertical cross-sectional shape of the groove 231 is a V-shaped structure or an inverted trapezoidal structure, so that the depth D of the groove 231 changes normally with a trend of gradually increasing first and then gradually decreasing. This can further optimize the area change of the backflow during the process of flowing through the groove 231.

[0017] In this embodiment, the width W of the groove 231 is set to increase first and then decrease from the leading edge 21 to the trailing edge 22, and the depth D of the groove 231 is set to increase first and then decrease from the leading edge 21 to the trailing edge 22. That is, the depth D and width W of the groove 231 are both the largest in the middle between the leading edge 21 and the trailing edge 22 and gradually decrease towards both sides. This can further optimize the area change of the backflow during the process of flowing through the groove 231.

[0018] In this embodiment, the outer edge 23 is bent from the pressure surface 24 side to the suction surface 25 side, which can reduce noise.

[0019] This utility model also provides a fan with the aforementioned booster impeller, including a casing and the aforementioned booster impeller disposed within the casing, effectively improving the static pressure and efficiency of the fan; specifically as follows... Figure 4 and Figure 5 As shown, the static pressure variation curves and efficiency variation curves of the novel fan of this patent and the existing fan at different flow rates (air volume) are disclosed. By comparison, it can be found that: at the same flow rate, the static pressure of the novel fan using the pressurizing impeller of this patent is increased by 2% to 5% compared with the existing fan, and its aerodynamic efficiency is also increased by 0.5% to 1.5% accordingly.

[0020] Compared with the prior art, the present invention has a simple and reasonable structure. The groove constructed on the outer edge end face of the blade allows the backflow to be affected by the change in area from first increasing to decreasing, resulting in local diffusion and weakening of the backflow velocity. This reduces the pressure drop loss caused by the backflow, thereby improving the static pressure and efficiency of the fan.

[0021] The above-disclosed embodiments are merely examples of the present utility model. However, the present utility model is not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A booster impeller, comprising a hub and a plurality of blades disposed on the hub, said blades comprising a leading edge, a trailing edge, an outer edge, a pressure surface, and a suction surface, characterized in that, A groove extending from the front edge to the rear edge is provided on the end face of the outer edge. The groove is used to increase the damping of the backflow from the pressure surface to the suction surface.

2. The booster impeller according to claim 1, characterized in that, The depth of the groove is set to first increase and then decrease from the pressure side to the suction side.

3. A booster impeller according to claim 1 or 2, characterized in that, The vertical cross-sectional shape of the groove is a V-shaped structure or an inverted trapezoidal structure.

4. A booster impeller according to claim 1, characterized in that, The width of the groove is set to first increase and then decrease from the front edge to the rear edge.

5. A booster impeller according to claim 1, characterized in that, The depth of the groove is set to first increase and then decrease from the front edge to the rear edge.

6. A booster impeller according to claim 1, characterized in that, The outer edge is bent from the pressure side to the suction side.

7. A fan, characterized in that, It includes the housing and the impeller as described in any one of claims 1-6.

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