Impeller, fan and range hood

Abstract

The utility model provides an impeller, a fan and a range hood, and relates to the field of electric appliances, the impeller comprises a middle disc assembly and a plurality of blades which are uniformly arranged on the middle disc assembly around the circumferential direction of the middle disc assembly; each blade comprises a first air inlet section and a second air inlet section which are distributed at the two axial ends of the middle disc assembly and protrude inwards in the radial direction of the middle disc assembly. The blade inlet angle alpha of the first section of the air inlet is gradually increased in the axial direction of the middle disc assembly from the end away from the middle disc assembly to the middle disc assembly. The fan comprises a volute and the impeller. The range hood comprises the fan. By optimizing the blade form, the pneumatic efficiency of the fan is improved, the air volume is increased, and the effect of optimizing the performance of the fan is achieved.

Description

Technical Field

[0001] The utility model relates to the field of electrical appliances, in particular to an impeller, a fan and a range hood. Background Art

[0002] As the core component of a range hood, the centrifugal fan plays a crucial role in the aerodynamic performance of the entire unit. The impeller of a centrifugal fan primarily consists of a center disk assembly (primarily the central hub) and multiple blades evenly mounted around the disk assembly. Blades are key components influencing centrifugal fan performance, and optimizing blade form can improve airflow within the blade flow path.

[0003] When the airflow flows through the impeller, it has some important parameters, including the blade inlet, blade outlet, blade flow channel, blade inlet angle, blade outlet angle and airflow angle of attack. Among them: the blade inlet refers to the position where the airflow begins to interact with the blade, the blade outlet refers to the position where the airflow completes the interaction with the blade and leaves the blade, and the blade flow channel refers to the entire area from the blade inlet to the blade outlet. The blade inlet angle refers to the angle between the airflow and the surface at the blade inlet when it enters the blade flow channel. It can be specifically expressed as the angle between the inlet side tangent line 1 and the inlet side circumferential tangent line 2 of the radial section of the blade along the mid-disk assembly. The blade outlet angle refers to the angle between the airflow and the blade inlet surface when it leaves the blade flow channel. The airflow angle of attack refers to the angle between the airflow direction line and the blade chord line.

[0004] Through experimental verification, it was found that the flow near the blade flow channel of the centrifugal fan presents a three-dimensional flow state. When the airflow enters the blade flow channel of the centrifugal fan, the airflow attack angle is unevenly distributed along the impeller axis, resulting in: (1) In the impeller axis, the suction surface of the blade produces different degrees of flow separation (flow separation refers to the airflow in the boundary layer separating from the solid surface, forming a low-speed or stagnant airflow area), which will reduce the lift of the blade and increase the resistance, thereby reducing the aerodynamic efficiency of the centrifugal fan; (2) Secondary flow is generated at the outlet of the blade flow channel (secondary flow is a lateral flow perpendicular to the mainstream), causing the airflow to form vortices at the blade outlet. These vortices will increase the turbulence intensity, resulting in energy loss and increased noise, and will also reduce the aerodynamic efficiency of the centrifugal fan.

[0005] The blade design of traditional centrifugal fans adopts a two-dimensional design method. The blade inlet angle and blade outlet angle are fixed and the blades are straight. They cannot adapt to the three-dimensional flow state near the blade flow channel of the centrifugal fan, resulting in low aerodynamic efficiency of the centrifugal fan and difficulty in increasing the air volume. Utility Model Content

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides an impeller comprising a center disk assembly and a plurality of blades uniformly mounted on the center disk assembly around the circumference of the center disk assembly. The blades include a first inlet section and a second inlet section, distributed at axial ends of the center disk assembly, and projecting radially inward along the center disk assembly. The angle between a first tangent line on the inlet side of the blade and a second tangent line on the inlet side of a radial cross-section of the blade along the center disk assembly is defined as a blade inlet angle α. The blade inlet angle α of the first inlet section gradually increases along the axial direction of the center disk assembly from the end distal to the center disk assembly toward the center disk assembly.

[0008] In the impeller provided by the present invention, optionally, the blade inlet angle α of the second section of the air inlet gradually increases along the axial direction of the center disk assembly from the end away from the center disk assembly toward the center disk assembly.

[0009] In the above optional implementation manner, optionally, 45°≤α≤85°, preferably, 55°≤α≤75°.

[0010] In addition, in the impeller provided by the present invention, optionally, the inlet side of the blade is inclined in the direction away from the axis of the center disk assembly, and the angle between the inlet side of the blade and the radial plane of the center disk assembly is the sweep angle β, and the sweep angle β satisfies: 55°≤β<90°, preferably, 65°≤β<90°.

[0011] Optionally, the axial direction of the center disk assembly is taken as the height direction of the blade, the total height of the blade is h, and the height of the blade at the air inlet section is h1, then:

[0012] Optionally, an inclination angle ε is formed between the outlet side of the blade and the axial direction of the center disk assembly, and the inclination angle ε satisfies: 0°<ε≤25°, preferably, 0°<ε≤18°.

[0013] Optionally, a side of the blade radially facing away from the center disk assembly is parallel to the axis of the center disk assembly.

[0014] In a second aspect, the present invention provides a fan comprising a volute and an impeller according to any of the aforementioned embodiments. The volute has a first air inlet and a second air inlet; the impeller is mounted within the volute, with one axial end of the center disk assembly facing the first air inlet and the other end facing the second air inlet.

[0015] In the fan provided by the present invention, optionally, a motor is further installed inside the volute, and the motor is arranged on a side of the middle disk assembly facing the second air inlet and is transmission-connected to the rotating shaft of the middle disk assembly.

[0016] In a third aspect, the present invention provides a range hood comprising the fan of any one of the aforementioned embodiments.

[0017] Since the range hood and the fan provided by the present invention both include the impeller provided by the first aspect, the range hood and the fan provided by the present invention can achieve all the beneficial effects that can be achieved by the impeller provided by the first aspect.

[0018] In particular, in the content of the present utility model, the technical features before "and / or" and the technical features after "and / or" are designed simultaneously or selectively.

[0019] The impeller provided by the utility model and the fan and range hood including the impeller can at least reduce the flow separation phenomenon in the blade flow channel compared with traditional impellers, fans and range hoods, thereby reducing the separation bubble area, increasing the effective flow area of ​​the blade flow channel, and further improving the aerodynamic efficiency of the fan, increasing the air volume, and optimizing the fan performance.

[0020] In addition, the impeller, fan and range hood have other beneficial effects, which will be explained in detail in the specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 An axonometric view of the overall structure of the impeller provided in an embodiment of the utility model;

[0023] Figure 2 A side view of the overall structure of the impeller provided in an embodiment of the utility model;

[0024] Figure 3 An axonometric diagram of the overall structure of the fan provided in an embodiment of the utility model;

[0025] Figure 4 A half-section view of the overall structure of the fan provided by an embodiment of the utility model;

[0026] Figure 5 Schematic diagram of the blade inlet angle of the impeller provided in the embodiment of the utility model Figure 1 ;

[0027] Figure 6 for Figure 5 A partial enlarged view of area A in the middle;

[0028] Figure 7 Schematic diagram of the blade inlet angle of the impeller provided in the embodiment of the utility model Figure 2 ;

[0029] Figure 8 The principle of changing the blade inlet angle of the impeller provided by the embodiment of the utility model Figure 1 ;

[0030] Figure 9 The principle of changing the blade inlet angle of the impeller provided by the embodiment of the utility model Figure 2 ;

[0031] Figure 10 for Figure 9 Schematic diagram of the airflow angle of attack when the middle blade inlet angle is large;

[0032] Figure 11 for Figure 9 Schematic diagram of the airflow angle of attack when the middle blade inlet angle is small;

[0033] Figure 12 A schematic diagram of the blade height and blade inlet side sweep angle of the impeller provided in an embodiment of the utility model;

[0034] Figure 13 Schematic diagram of the impeller vortex simulation results of traditional straight blades;

[0035] Figure 14 Schematic diagram of the impeller vortex simulation results of the swept-back blade provided in an embodiment of the present invention.

[0036] Icons: 1-impeller; 2-middisk assembly; 3-blades; 31-air inlet section 1; 32-air inlet section 2; 301-blade inlet side; 302-inlet side circular line; 3011-inlet side tangent line 1; 3021-inlet side circular tangent line 2; 303-blade outlet side; 4-volute; 41-air inlet 1; 42-air inlet 2; 5-motor; 6-motor bracket. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0039] It should be noted that like reference numerals and letters denote similar items in the drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0040] In the description of this utility model, it should be noted that the terms "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] Furthermore, the terms "horizontal" and "vertical" do not imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0042] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0043] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0044] The first aspect of the present application provides an impeller 1, referring to Figure 1 、 Figure 2 as well as Figures 5 to 7 The impeller 1 includes a center disk assembly 2 and a plurality of blades 3 evenly mounted on the center disk assembly 2 in a circumferential direction. The plurality of blades 3 constitute a blade assembly. Each blade 3 includes an air inlet section 1 31 and an air inlet section 2 32 distributed at both axial ends of the center disk assembly 2 and protrudes radially inwardly along the center disk assembly 2. Figures 1 to 6As shown, each blade 3 has a blade inlet side 301 and a blade outlet side 303. On the radial cross-section of each blade 3 along the middle disk assembly 2, the blade assembly has an inlet side circumferential line 302. On the radial cross-section of each blade 3 along the middle disk assembly 2, an inlet side tangent line 1 3011 and an inlet side circumferential tangent line 2 3021 of each blade 3 are made. Then, the angle between the inlet side tangent line 1 3011 and the inlet side circumferential tangent line 2 3021 of each blade 3 along the radial cross-section of the middle disk assembly 2 is the blade inlet angle α. In this application, the blade inlet angle α of the air inlet section 31 of each blade 3 is set to gradually increase along the axial direction of the middle disk assembly 2 from the end away from the middle disk assembly 2 toward the middle disk assembly 2.

[0045] The second aspect of the present application provides a fan, referring to Figure 3 、 Figure 4 as well as Figures 8 to 12 , and combined Figure 1 、 Figure 2 as well as Figures 5 to 7 The fan includes a volute 4 and the aforementioned impeller 1. The volute 4 has an air inlet 1 41 and an air inlet 2 42. The aforementioned impeller 1 is mounted within the volute 4, with one axial end of the center disk assembly 2 facing the air inlet 1 41 and the other end facing the air inlet 2 42. In this fan, a motor 5 is also mounted within the volute 4. The motor 5 is located on the side of the center disk assembly 2 facing the air inlet 2 42 and is in transmission connection with the rotating shaft of the center disk assembly 2. The specific installation method for the motor 5 within the volute 4 includes, but is not limited to, fixing a motor bracket 6 within the volute 4 and then fixing the motor 5 to the motor bracket 6.

[0046] Refer to the following Figures 1 to 12 , the beneficial effects that can be achieved by the impeller 1 provided in this application and the fan including the impeller 1 are described:

[0047] like Figures 8 to 11As shown, since the blade design of the traditional fan adopts a two-dimensional design method, its blade inlet angle and blade outlet angle are fixed and unchanged, and the blade is a straight blade, and the three-dimensional flow state of the airflow along the blade axis is not considered. Therefore, in the actual working state of the traditional fan, due to the three-dimensional turbulence of the gas flow, when the airflow enters the blade inlet, it flows along the axial direction of the impeller 1 from the volute air inlet 41 to the middle disk component 2, and the airflow attack angle γ gradually decreases, and the separation of the airflow in the blade flow channel gradually weakens, that is, the larger the airflow attack angle γ, the stronger the airflow separation phenomenon, and the separation bubble formed by the airflow separation in the blade flow channel blocks the flow channel, resulting in a decrease in air volume and aerodynamic efficiency; therefore, the present application sets the blade inlet angle α of the air inlet section 31 of each blade 3 to gradually increase along the axial direction of the middle disk component 2 from the end away from the middle disk component 2 toward the middle disk component 2, that is, the blade inlet angle α is reduced on the side close to the volute air inlet 41, the airflow attack angle γ when the airflow enters the blade 3 is reduced, the flow separation phenomenon is weakened, and the effective flow area of ​​the blade flow channel is ensured to improve the aerodynamic efficiency. The simulation experiment results are just as shown. Figures 9 to 11 As shown, combined Figure 8 , Figure 11 The blade inlet angle α2 of the middle blade 3 on the side close to the volute air inlet 41 is less than Figure 10 The blade inlet angle α1 of the middle blade 3 on the side close to the volute air inlet 41 corresponds to: Figure 11 The airflow attack angle γ2 when the middle airflow enters blade 3 is also smaller than Figure 10 The airflow attack angle γ1 when the middle airflow enters blade 3, Figure 11 There are significantly fewer vesicles in the Figure 10 .

[0048] Therefore, the impeller 1 provided in the present application and the fan including the impeller 1 adopt a blade inlet angle α that is non-uniformly distributed along the axial direction. Compared with traditional impellers and fans, it can reduce the flow separation phenomenon in the blade flow channel, thereby reducing the separation bubble area, increasing the effective flow area of ​​the blade flow channel, and then improving the aerodynamic efficiency of the fan, increasing the air volume, and optimizing the fan performance.

[0049] In this application, a more specific embodiment structure of the impeller 1 is described as follows. The fan adaptability adopts the impeller 1 with the following specific structure:

[0050] This embodiment provides an impeller 1. Based on the impeller structure described above, this impeller 1 further optionally has a blade inlet angle α of the second air inlet section 32 of each blade 3 that gradually increases along the axial direction of the center disk assembly 2, from the end distal to the center disk assembly 2 toward the center disk assembly 2. This structure allows each blade 3 to form an angle between the first air inlet section 31 and the second air inlet section 32, which bulge inward along the center disk assembly 2. This allows the structure of the second air inlet section 32 of each blade 3 to be compatible with the first air inlet section 31. Furthermore, space is reserved for mounting the motor 5 within the fan volute 4.

[0051] After multiple simulation tests, the applicant confirmed that for the air inlet section 1 31 and / or the air inlet section 2 32 of each blade 3, the blade inlet angle α involved can be, optionally, Figure 7 As shown, 45°≤α≤85°, specifically, the blade inlet angle α is 45°, 55°, 58°, 60°, 65°, 70°, 75°, 85°, or any angle between 45° and 85°, wherein, further preferably, 55°≤α≤75°, for example, the blade inlet angle α is 55°, 60°, 65°, 70°, 75° or any angle between 55° and 75°, to ensure that the impeller 1 and the fan can significantly increase the effective flow area of ​​the blade flow channel compared to traditional impellers and fans, thereby improving the aerodynamic efficiency of the fan, increasing the air volume, and optimizing the fan performance.

[0052] In addition, in the impeller 1 provided in this embodiment, optionally, as Figure 12 As shown, the blade inlet side 301 of each blade 3 is inclined toward the axial direction away from the center disk assembly 2, and the angle between the blade inlet side 301 and the radial plane of the center disk assembly 2 is the sweep angle β, then, the sweep angle β satisfies: 55°≤β<90°, specifically, the sweep angle β is 55°, 65°, 68°, 70°, 75°, 80°, 89° or any angle between 55° and 90° (excluding 90°), wherein, further preferably, 65°≤β<90°, for example, the sweep angle β is 65°, 70°, 80°, 89° or any angle between 65° and 90° (excluding 90°). In this optional embodiment, the blade 3 is set as a swept blade, similar to the wing of an airplane. After the airflow passes through the swept leading edge of the blade 3 (i.e., the blade inlet side 301), the change in the cross-section of the blade 3 causes an uneven pressure gradient in the axial direction, generating a force from the large cross-section to the small cross-section flow channel in the blade flow channel, pushing the airflow to generate a three-dimensional flow along the axial direction, thereby compressing the vortex area and improving the aerodynamic efficiency. The simulation results can be referred to Figure 13 and Figure 14 Obtain, among which, Figure 13 This is a schematic diagram of the flow simulation results of the inlet side section of a traditional straight blade. Figure 14 This is a schematic diagram of the flow simulation results for the swept-blade inlet side of this optional embodiment. It shows that the vortex area on the main inlet side of the swept-blade provided in this optional embodiment is significantly reduced compared to the vortex area on the inlet side of a traditional straight blade. In other words, by adopting the swept-wing principle and optimizing the structure of the blade inlet side 301 of blade 3, the vortex area is compressed, further improving aerodynamic efficiency.

[0053] In addition, if Figure 12As shown, optionally, the axial direction of the center disk assembly 2 is the height direction of the blade 3, the total height of the blade 3 is h, and the height of the blade at the air inlet section 31 of the blade 3 is h1, then: Since the second air inlet section 32 of the blade 3 is affected by the motor 5 and its air inlet area is reduced, the working capacity of the blade 3 should be lower than that of the first air inlet section 31, so that the flow of the air inlets on both sides of the impeller 1 can be effectively distributed.

[0054] Alternatively, as Figure 2 As shown, there is an inclination angle ε between the blade outlet side 303 of each blade 3 and the axial direction of the center disk assembly 2, and the inclination angle ε satisfies: 0°<ε≤25°. Specifically, the inclination angle ε is 1°, 5°, 10°, 15°, 18°, 20°, 25°, or any angle between 0° and 25° (excluding 0°). Among them, further preferably, 0°<ε≤18°, for example, the inclination angle ε is 1°, 5°, 10°, 15°, 18°, or any angle between 0° and 18° (excluding 0°). The above inclination angle is beneficial for reducing the impact of the airflow on the inner wall of the volute 4 when the airflow flows out of the blade flow channel, thereby reducing aerodynamic noise.

[0055] Optionally, the side of the blades 3 of the impeller 1 radially facing away from the center disk assembly 2 is parallel to the axis of the center disk assembly 2 , that is, the blades 3 of the impeller 1 form inward-swept blades.

[0056] In addition, the third aspect of the present application also provides a range hood, which includes the aforementioned fan.

[0057] Since the fan and range hood provided in this application both include an impeller 1, the fan and range hood provided in this application can achieve all the beneficial effects that the impeller 1 can achieve, and their specific structures and achievable effects can be obtained by referring to the various optional or preferred implementations of the impeller 1.

[0058] Finally, it should be noted that:

[0059] 1. In this specification, the technical features before “and / or” and the technical features after “and / or” are designed simultaneously or selectively;

[0060] 2. The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other; the above embodiments in this specification are only used to illustrate the technical solutions of the utility model, rather than to limit it; although the utility model is described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some or all of the technical features therein with equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the utility model.

Claims

1. An impeller, characterized in that: It comprises a center disk assembly (2) and a plurality of blades (3) uniformly mounted on the center disk assembly (2) in a circumferential direction around the center disk assembly (2); The blade (3) comprises an air inlet section (31) and an air inlet section (32) distributed at both axial ends of the center disk assembly (2) and protrudes inwardly in the radial direction of the center disk assembly (2); The included angle between the inlet side tangent line 1 (3011) and the inlet side circumferential tangent line 2 (3021) of the blade (3) along the radial section of the middle disk assembly (2) is taken as the blade inlet angle α, and the blade inlet angle α of the air inlet section (31) gradually increases along the axial direction of the middle disk assembly (2) from one end away from the middle disk assembly (2) toward the middle disk assembly (2).

2. The impeller according to claim 1, characterized in that: The blade inlet angle α of the second air inlet section (32) gradually increases along the axial direction of the center disk assembly (2) from one end away from the center disk assembly (2) toward the center disk assembly (2).

3. The impeller according to claim 1 or 2, characterized in that: 45°≤α≤85°。 4. The impeller according to claim 1, characterized in that: The inlet side of the blade (3) is inclined in a direction away from the axis of the center disk assembly (2), and the included angle between the inlet side of the blade (3) and the radial plane of the center disk assembly (2) is a sweep angle β, and the sweep angle β satisfies: 55°≤β<90°.

5. The impeller according to claim 1, characterized in that: The axial direction of the middle disk assembly (2) is the height direction of the blade (3), the total height of the blade (3) is h, and the blade height of the air inlet section (31) is h1, then: ≥ .

6. The impeller according to claim 1, characterized in that: There is an inclination angle ε between the outlet side of the blade (3) and the axial direction of the center disc assembly (2), and the inclination angle ε satisfies: 0°<ε≤25°.

7. The impeller according to claim 1, characterized in that: The side of the blade (3) radially away from the center disc assembly (2) is parallel to the axis of the center disc assembly (2).

8. A fan, characterized in that: It comprises a volute (4) and an impeller (1) according to any one of claims 1 to 7; the volute (4) has an air inlet 1 (41) and an air inlet 2 (42); the impeller (1) is installed in the volute (4), and one axial end of the center disk assembly (2) faces the air inlet 1 (41) and the other end faces the air inlet 2 (42).

9. The fan according to claim 8, characterized in that: A motor (5) is also installed inside the volute (4). The motor (5) is arranged on the side of the middle disk assembly (2) facing the second air inlet (42) and is transmission-connected to the rotating shaft of the middle disk assembly (2).

10. A range hood, characterized in that: Including the fan described in claim 8 or 9.

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