Fan impeller and fan

Abstract

The utility model belongs to the technical field of fans, and discloses a fan impeller and a fan. The fan impeller comprises a hub and a plurality of blades, the blades are arranged at intervals in the circumferential direction of the hub, each blade comprises a windward suction surface and a leeward pressure surface, the pressure surfaces are arranged smoothly, the suction surfaces are wavy, and the waveform function of the suction surfaces is y1 = A1 * (sin omega 1x + phi 1) K1. The fan impeller can effectively improve the performance of a fan and reduce the noise of the fan.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to a fan impeller and a fan. Background Art

[0002] The impeller generally consists of a hub and blades. The hub is where the blades are installed, used to support the blades and transmit torque. The blades are the only part of the impeller that does work on the fluid, and its structure directly determines the performance level of the fan.

[0003] In order to reduce the noise of the fan, some impellers have been improved according to bionics, and the blades are set to be wavy. The impellers using such blades have improved the fan performance and noise. However, the blades of this structure are wavy as a whole, which will cause the actual inlet airflow angle to deviate greatly from the designed airflow angle, which will cause the airflow on the suction side to separate early, causing wind pressure loss. In addition, the airflow on the pressure side will also separate, which will reduce the efficiency of the impeller and increase the noise. Therefore, the overall wavy blades are not ideal in reducing noise, and the improvement of the fan performance is not high.

[0004] Therefore, there is an urgent need to provide a fan impeller and a fan to solve the above technical problems. Utility Model Content

[0005] According to one aspect of the utility model, the utility model provides a fan impeller, which can effectively improve the fan performance and reduce the fan noise.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A fan impeller comprises a hub and a plurality of blades, wherein the plurality of blades are arranged at intervals along the circumference of the hub, wherein the blades comprise a windward suction surface and a leeward pressure surface, wherein the pressure surface is smoothly arranged, and the suction surface is wavy, and the waveform function of the suction surface is: y1=A1×(sinω1x+φ1) K1 .

[0008] As a preferred technical solution for the fan impeller, the value of A1 is 60%-80% of the maximum thickness of the blade, the value of ω1 is 3-6, and the value of K1 is 2-5.

[0009] As a preferred technical solution for the fan impeller, the leading edge of the blade is also wavy.

[0010] As a preferred technical solution for the fan impeller, the waveform function of the leading edge is:

[0011] y2=A2×(sinω2x+φ2) K2 +A2×(sinω3x+φ3) K3 .

[0012] As a preferred technical solution for the fan impeller, the difference between φ3 and φ2 is 0°-45°.

[0013] As a preferred technical solution for the fan impeller, the value of A2 is 5%-25% of the chord length of the blade, the value of ω2 is 3-6, the value of ω3 is 3-6, the value of K2 is 2-5, and the value of K3 is 2-5.

[0014] As a preferred technical solution for the fan impeller, the blade tip away from the hub is bent toward the suction surface to form a blade tip winglet.

[0015] As a preferred technical solution for the fan impeller, the root of each blade is fixed obliquely on the outer peripheral wall of the hub.

[0016] As a preferred technical solution for the fan impeller, the blades are spiral blades.

[0017] According to another aspect of the utility model, the utility model further provides a fan, comprising a drive shaft and a fan impeller as described in any of the above technical solutions, wherein the hub of the fan impeller is connected to the drive shaft.

[0018] Beneficial effects of the utility model:

[0019] The utility model provides a fan impeller, comprising a hub and a plurality of blades. The plurality of blades are arranged at intervals along the circumference of the hub, and the blades include a suction surface and a pressure surface, the pressure surface is arranged smoothly, and the suction surface is wavy. By arranging the suction surface into a wavy shape, the shape of the fin of a humpback whale is simulated, and the disturbance of the flow when the airflow separates from the blades is suppressed, thereby reducing aerodynamic noise. By arranging the pressure surface smoothly, the separation of the airflow on the pressure side can be avoided, thereby improving the efficiency of the fan and reducing aerodynamic noise.

[0020] And, the waveform function of the suction surface is set to y1 = A1 × (sinω1x + φ1) K1 ,Through simulation analysis, the fan impeller using this waveform has better ,efficiency and lower noise than the fan impeller using a sine waveform.

[0021] The utility model also provides a fan, comprising a driving shaft and the above-mentioned fan impeller. The fan has higher fan performance and lower noise because the fan impeller is adopted. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the structure of a fan impeller provided in an embodiment of the utility model at a viewing angle;

[0024] Figure 2 A schematic diagram of the structure of a fan impeller provided by an embodiment of the utility model at another viewing angle;

[0025] Figure 3 A cross-sectional view of a blade provided in an embodiment of the utility model;

[0026] Figure 4 A comparison diagram of the fan performance of the fan impeller provided by the embodiment of the utility model and the fan performance of the fan impeller whose blades are wavy as a whole;

[0027] Figure 5 A comparison diagram of the fan performance of the fan impeller provided in an embodiment of the utility model and the fan performance of a fan impeller whose waveform function is a sine function.

[0028] In the figure:

[0029] 100, hub; 200, blade; 210, suction surface; 220, pressure surface; 230, leading edge; 240, blade tip winglet. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] The blades of the fan impeller include a suction surface and a pressure surface, with the suction surface facing the wind and the pressure surface leeward. When the fan impeller rotates, negative pressure will be formed on the suction surface and positive pressure will be formed on the pressure surface. Therefore, the airflow on the suction surface is easy to separate from the suction surface. The separation of the airflow will reduce the wind pressure performance and also cause noise. Since the pressure on the pressure surface is sufficient, the airflow is not easy to separate from the pressure surface. Therefore, the main factor affecting the performance and noise of the fan lies in the suction surface. In order to reduce the noise of the fan, some impellers have been improved according to bionics, and the blades are set to be wavy as a whole. The impellers using such blades have improved the fan performance and noise. However, the actual inlet airflow angle of the blades of this structure is quite different from the design value, which often causes the airflow on the suction surface to separate in advance, making the effect of improving the fan performance and reducing the fan noise unsatisfactory.

[0035] Based on the above problems, this embodiment provides a fan impeller, which can effectively improve the fan performance and reduce the fan noise.

[0036] Specifically, Figure 1-Figure 3 As shown, the fan impeller includes a hub 100 and a plurality of blades 200, and the plurality of blades 200 are arranged at intervals along the circumference of the hub 100. The number of blades 200 can be set according to actual needs, and can be two, three, four, five, etc.

[0037] The blade 200 includes a suction surface 210 and a pressure surface 220, wherein the suction surface 210 faces the wind and the pressure surface 220 faces the windward. The pressure surface 220 is smoothly arranged, while the suction surface 210 is wavy. Such an arrangement can ensure that the actual inlet airflow attack angle of the blade 200 is not much different from the design value, thereby ensuring that the airflow on the suction surface 210 can be separated according to the design, thereby ensuring the efficiency of the fan impeller and reducing the noise of the fan impeller.

[0038] Furthermore, the waveform function of the suction surface 210 is set to y1=A1×(sinω1x+φ1) K1 ,Through simulation analysis, the fan impeller using this waveform has better ,efficiency and lower noise compared with the fan impeller using a sine waveform.

[0039] Figure 4 A comparison chart of the fan performance of the fan impeller provided in this embodiment and the fan performance of the fan impeller with wavy blades. The horizontal axis is the flow value, in m 3 / h, the left vertical axis is the static pressure value, the unit is pa, and the right vertical axis is the efficiency value, the unit is %.

[0040] Figure 4 The solid line in the middle represents the wind pressure performance of the fan. represents the fan performance curve of the fan impeller provided in this embodiment, It represents the fan performance curve of the fan impeller with wavy blades. Figure 4 It can be seen that under the condition of the same flow rate, the static pressure of the fan impeller provided by this embodiment is greater than the static pressure of the fan impeller whose blades are wavy as a whole.

[0041] Figure 4 The middle dotted line represents the efficiency of the fan. represents the fan performance curve of the fan impeller provided in this embodiment, It represents the fan performance curve of the fan impeller with wavy blades. Figure 4 It can be seen that under the condition of the same flow rate, the efficiency of the fan impeller provided by this embodiment is greater than the efficiency of the fan impeller whose blades are wavy as a whole.

[0042] Figure 5 A comparison chart of the fan performance of the fan impeller provided by the embodiment of the utility model and the fan performance of the fan impeller whose waveform function is a sine function. The horizontal axis is the flow value, in m 3 / h, the left vertical axis is the static pressure value, the unit is pa, and the right vertical axis is the efficiency value, the unit is %.

[0043] It is worth noting that, in the fan impeller whose waveform function is a sine function, only the waveform function of the suction surface is different from that in the present embodiment, and the other structures are the same.

[0044] Figure 5 The solid line in the middle represents the wind pressure performance of the fan. represents the fan performance curve of the fan impeller provided in this embodiment, It represents the fan performance curve of the fan impeller whose waveform function is a sine function. Figure 5 It can be seen that, under the condition of the same flow rate, the static pressure of the fan impeller provided by this embodiment is greater than the static pressure of the fan impeller whose waveform function is a sine function.

[0045] Figure 5 The middle dotted line represents the efficiency of the fan. represents the fan performance curve of the fan impeller provided in this embodiment, It represents the fan performance curve of the fan impeller whose waveform function is a sine function. Figure 5 It can be seen that under the condition of the same flow rate, the efficiency of the fan impeller provided by this embodiment is greater than the efficiency of the fan impeller whose waveform function is a sine function.

[0046] It is worth noting that the fan impeller provided in this embodiment can be used in a centrifugal fan or an axial flow fan.

[0047] Further, in this embodiment, the value of A1 may be 60%-80% of the maximum thickness of the blade 200, the value of ω1 may be 3-6, and the value of K1 may be 2-5. With such settings, the fan impeller has better performance.

[0048] For example, the value of A1 may be 60%, 70% or 80% of the maximum thickness of the blade 200, etc. The value of ω1 may be 3, 4, 5 or 6, etc. The value of K1 may be 2, 3, 4 or 5, etc.

[0049] Further, see Figure 1 and Figure 2 The leading edge 230 of the blade 200 is also wavy. This arrangement can reduce the separation of the airflow from the suction surface 210 to a certain extent, thereby reducing noise.

[0050] Optionally, in this embodiment, the waveform function of the leading edge 230 is:

[0051] y2=A2×(sinω2x+φ2) K2 +A2×(sinω3x+φ3) K3 .

[0052] Through simulation analysis, the leading edge 230 of the waveform has a better noise reduction effect.

[0053] Further, the difference between φ3 and φ2 is 0°-45°. Exemplarily, the difference between φ3 and φ2 can be 0°, 15°, 25°, 35° or 45°.

[0054] Further, the value of A2 can be 5%-25% of the chord length of the blade 200, the value of ω2 can be 3-6, the value of ω3 can be 3-6, the value of K2 can be 2-5, and the value of K3 can be 2-5. According to simulation analysis, such a setting has a better performance of the fan impeller.

[0055] For example, the value of A2 may be 5%, 10%, 15%, 20% or 25% of the chord length, etc. The value of ω2 may be 3, 4, 5 or 6, etc. The value of ω3 may be 3, 4, 5 or 6, etc. The value of K2 may be 2, 3, 4 or 5, etc. The value of K3 may be 2, 3, 4 or 5, etc.

[0056] Further, see Figure 2 The blade tip of the blade 200 away from the hub 100 is bent toward the suction surface 210 to form a blade tip winglet 240. This arrangement can reduce the leakage vortex at the top of the fan blade 200, thereby reducing broadband noise.

[0057] Further, see Figure 2 The root of each blade 200 is fixed obliquely on the outer peripheral wall of the hub 100. According to the aerodynamic principle, the timing of the airflow hitting the leading edge 230 of the blade 200 can be staggered, which can improve the through-band noise caused by the inlet turbulence.

[0058] Optionally, in this embodiment, the blade 200 is a spiral blade. Of course, in other embodiments, the shape of the blade 200 can also be set to other shapes according to actual needs.

[0059] This embodiment further provides a fan, including a drive shaft and the above-mentioned fan impeller, wherein the hub 100 of the fan impeller is connected to the drive shaft.

[0060] Since the fan adopts the above-mentioned fan impeller, the fan performance is higher and the noise is lower.

[0061] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A fan impeller, characterized in that: The invention comprises a hub (100) and a plurality of blades (200), wherein the plurality of blades (200) are arranged at intervals along the circumference of the hub (100), the blades (200) comprise a windward suction surface (210) and a leeward pressure surface (220), the pressure surface (220) is smoothly arranged, the suction surface (210) is wavy, and the waveform function of the suction surface (210) is: y1=A1×(sinω1x+φ1) K1 。 2. The fan impeller according to claim 1, characterized in that: The value of A1 is 60%-80% of the maximum thickness of the blade (200), the value of ω1 is 3-6, and the value of K1 is 2-5.

3. The fan impeller according to claim 1, characterized in that: The leading edge (230) of the blade (200) is also wavy.

4. The fan impeller according to claim 3, characterized in that: The waveform function of the leading edge (230) is: y2=A2×(sinω2x+φ2) K2 +A2×(sinω3x+φ3) K3 .

5. The fan impeller according to claim 4, characterized in that: The difference between φ3 and φ2 is 0°-45°.

6. The fan impeller according to claim 4, characterized in that: The value of A2 is 5%-25% of the chord length of the blade (200), the value of ω2 is 3-6, the value of ω3 is 3-6, the value of K2 is 2-5, and the value of K3 is 2-5.

7. The fan impeller according to any one of claims 1 to 6, characterized in that: The blade (200) is bent at a tip away from the hub (100) toward the suction surface (210) to form a blade tip winglet (240).

8. The fan impeller according to any one of claims 1 to 6, characterized in that: The blade root of each blade (200) is fixed obliquely on the outer peripheral wall of the hub (100).

9. The fan impeller according to claim 1, characterized in that: The blade (200) is a spiral blade.

10. A fan, characterized in that: It comprises a driving shaft and a fan impeller according to any one of claims 1 to 9, wherein a hub (100) of the fan impeller is connected to the driving shaft.

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