Blade, impeller assembly, fan and range hood

Abstract

The utility model provides a blade, an impeller assembly, a fan and a range hood. Each blade is provided with an inner surface and an outer surface which are opposite to each other, protruding parts protrude from the inner surfaces to the outer surfaces on the blades, sunken parts are sunken from the outer surfaces to the inner surfaces on the blades, the blades extend in the first direction, the protruding parts and the sunken parts are alternately arranged in the first direction, and intervals exist between the protruding parts and the sunken parts in the first direction; each blade is provided with an air flow inlet side and an air flow outlet side, and the protruding parts and the sunken parts extend from the air flow inlet sides to the air flow outlet sides. According to the blade provided by the utility model, the convex parts and the concave parts which are alternately arranged are arranged on the blade, and the convex parts and the concave parts extend from the airflow inlet side to the airflow outlet side of the blade, so that when the blade drives airflow to flow, the convex parts and the concave parts can be used for carding the flowing airflow equivalently; the number of vortexes generated by airflow flowing can be smaller, and therefore aerodynamic noise generated when the blades drive the airflow to flow can be smaller.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen utensils, and particularly, to a blade, an impeller assembly, a fan and a range hood. Background Art

[0002] Range hoods have become one of the indispensable kitchen appliances in people's daily lives. A range hood can quickly extract the oil fumes generated during the user's cooking process, reduce pollution, purify the air, and greatly improve people's quality of life. A fan is usually arranged inside the range hood, and the fan usually includes an impeller assembly. The impeller assembly can include an impeller and a driving member, and the output shaft of the driving member can be connected to the impeller, so that the driving member can drive the impeller to rotate. When the impeller rotates, the multiple blades in the impeller rotate to drive the air flow to generate a negative pressure suction force inside the fan, so that the range hood can realize the function of sucking oil fumes through the fan.

[0003] However, in existing impellers, most of them adopt long strip-shaped blades with an arc-shaped cross-section. When such blades rotate with the impeller, eddy currents and turbulent flows are likely to be generated in the flow path between two adjacent blades, resulting in relatively high noise. Summary of the Utility Model

[0004] To at least partially solve the problems existing in the prior art, according to one aspect of the present utility model, a blade is provided. The blade has opposite inner and outer surfaces, a protruding portion protrudes from the inner surface towards the outer surface of the blade, a recessed portion is recessed from the outer surface towards the inner surface of the blade, the blade extends along a first direction, the protruding portions and the recessed portions are alternately arranged along the first direction and there is a gap between the protruding portions and the recessed portions along the first direction; wherein, the blade has an air inlet side and an air outlet side, and both the protruding portion and the recessed portion extend from the air inlet side to the air outlet side.

[0005] For the blade provided by the present utility model, the protruding portions and the recessed portions are alternately arranged on the blade, and both the protruding portion and the recessed portion extend from the air inlet side to the air outlet side of the blade. When such a blade drives the air flow to flow, the protruding portions and the recessed portions can be regarded as combing the flowing air, and there can be fewer eddy currents generated by the air flow, so that the aerodynamic noise generated when such a blade drives the air flow can be smaller.

[0006] Exemplarily, two adjacent protruding portions are centrosymmetric about the recessed portion between them, and two adjacent recessed portions are centrosymmetric about the protruding portion between them. Such multiple protruding portions and multiple recessed portions are alternately arranged, and the whole is more regular, so that the guiding and combing effect of such a blade on the air flow in the flow path is better.

[0007] Exemplarily, the protruding portion includes a protruding bottom wall away from the inner surface, and the recessed portion includes a recessed bottom wall away from the outer surface. Along the first direction, the length of the protruding bottom wall is equal to the length of the recessed bottom wall. Such a distribution of the protruding and recessed portions on the blade can be more regular, and the guiding and combing effects of multiple protruding and recessed portions on the airflow in the blade passage are better. Moreover, since the length of the protruding bottom wall is equal to the length of the recessed bottom wall, the blade structure is simpler and easier to process and form.

[0008] Exemplarily, the protruding portion includes a protruding bottom wall away from the inner surface, and the recessed portion includes a recessed bottom wall away from the outer surface. In the thickness direction of the blade, the thickness of the protruding bottom wall is equal to the thickness of the recessed bottom wall. Since the protruding and recessed portions can be formed by pressing on the blade, the thicker the thickness of the protruding bottom wall, the deeper the groove formed by the protruding portion. Similarly, the thicker the thickness of the recessed bottom wall, the deeper the groove formed by the recessed portion. When the thickness of the protruding bottom wall is equal to the thickness of the recessed bottom wall, the groove depths formed by the protruding and recessed portions are approximately the same, and the guiding and combing effects of the protruding and recessed portions on the airflow are approximately the same. The overall guiding and combing effect on the airflow in the blade passage can be better, and the guiding of the airflow in the blade passage is more uniform. Moreover, such a blade is easier to process and form, and the overall structure is also simpler and easier to implement.

[0009] Exemplarily, in the thickness direction, the blade has a blade thickness T1, and the thicknesses of both the protruding bottom wall and the recessed bottom wall are the bottom wall thickness T2, and the blade thickness T1 and the bottom wall thickness T2 satisfy T1 = T2. Since the protruding and recessed portions can be formed by pressing on the blade, such a blade structure is simpler, and the overall structure of the impeller is also simpler and easier to implement.

[0010] Exemplarily, along the first direction, the length of the protruding bottom wall is equal to the length of the recessed bottom wall. Such a distribution of the protruding and recessed portions on the blade can be more regular, and the guiding and combing effects of multiple protruding and recessed portions on the airflow in the blade passage are better. Moreover, since the length of the protruding bottom wall is equal to the length of the recessed bottom wall, the blade structure is simpler and easier to process and form.

[0011] Exemplarily, along the first direction, the lengths of both the protruding bottom wall and the recessed bottom wall are the bottom wall length M. In the thickness direction, the blade has a blade thickness T1, and the bottom wall length M and the blade thickness T1 satisfy M ≥ 2T1. When M ≥ 2T1, such a blade can have a better guiding and combing effect on the airflow in the blade passage, and the overall strength of such a blade can be better.

[0012] Exemplarily, the blade includes a profiled section and two connecting sections in the first direction. The two connecting sections are located on opposite sides of the profiled section in the first direction. The protrusions and depressions are both provided on the profiled section. When such a blade is applied to an impeller assembly, it is equivalent to the profiled section being connected to the impeller top plate and the impeller bottom plate respectively through the two connecting sections. Compared with the two ends of the profiled section in the first direction being directly connected to the impeller top plate and the impeller bottom plate, since there are no protrusions and depressions at the connection, the connection can be more stable in this way. Such a blade can be connected to the outside through the two connecting sections, and the profiled section does not need to be directly connected to the outside. There are no protrusions and depressions on the connecting sections, so the connection of the connecting sections to the outside can have better stability, and thus the stability of the blade connected to the outside through the connecting sections can also be better.

[0013] Exemplarily, the profiled section has a profiled length L1 in the first direction, and the blade has a blade length L2 in the first direction. The profiled length L1 and the blade length L2 satisfy L1≥0.8L2. When L1≥0.8L2, it can ensure that the profiled section on the blade has sufficient length, so that it can ensure that the blade can have a better guiding and combing effect on the airflow in the blade passage.

[0014] Exemplarily, the connecting section has a connecting length L3 in the first direction, and the blade has a blade length L2 in the first direction. The connecting length L3 and the blade length L2 satisfy L3≥0.1L2. When L3≥0.1L2, it can ensure that the two connecting sections on the blade have sufficient length. When the blade is connected to the outside through such connecting sections, it can be more stable, and with a certain length of the connecting section, it is also more convenient for the blade to be connected to the outside. When such a blade is applied to an impeller assembly, the two connecting sections in the blade are respectively connected to the impeller top plate and the impeller bottom plate, so that the blade can be more stable when connected to the impeller top plate and the impeller bottom plate, and thus the overall stability of the impeller can be better.

[0015] According to another aspect of the present invention, an impeller assembly is provided. The impeller assembly includes a driving member and an impeller. The impeller includes an impeller bottom plate and a plurality of blades of any one of the above-mentioned types. The plurality of blades are arranged in a ring to form a blade ring, and the blade ring is connected to the impeller bottom plate. The driving member has an output shaft, the impeller bottom plate is vertically connected to the output shaft, and the blade ring is centered on the output shaft.

[0016] Exemplarily, the impeller assembly includes a fairing. A cavity is formed by enclosing the blade ring and the impeller chassis. The fairing is detachably connected to the impeller chassis, and at least part of the fairing is located inside the cavity. The setting of the fairing can reduce the size of the area with a speed difference, so that less turbulent flow is generated when the air flow inside the impeller flows, and less aerodynamic noise is generated by the air flow inside the impeller. Moreover, since the fairing is detachably connected to the impeller chassis, fairings of different sizes and shapes can be replaced as needed, so that the impeller can be applied to a wider range of scenarios. The fairing detachably connected to the impeller chassis is also easier to disassemble, replace, repair, or clean.

[0017] Exemplarily, the fairing includes a top wall away from the impeller chassis. In a plane perpendicular to the first direction, the impeller has an impeller diameter D1, and the diameter of the top wall is D2. The impeller diameter D1 and the diameter D2 of the top wall satisfy D2 ≤ 0.3D1. When D2 ≤ 0.3D1, the interference of the fairing on the external air flow entering the inner cavity of the impeller can be reduced.

[0018] Exemplarily, a through hole is provided in the middle of the impeller chassis, and a shaft sleeve connecting to the output shaft is inserted through the through hole. It is very simple and convenient to connect the impeller chassis to the output shaft of the driving part through the shaft sleeve, so that the connection between the impeller chassis and the output shaft can be simpler, and the overall structure of the impeller assembly can be simpler and easier to implement.

[0019] According to another aspect of the present invention, a fan is provided. The fan includes a volute and any one of the impeller assemblies as described above. The impeller is disposed inside the volute, and the driving part is connected to the volute.

[0020] According to another aspect of the present invention, a range hood is provided. The range hood includes a box body and the fan as described above, and the fan is disposed inside the box body.

[0021] A series of simplified concepts are introduced in the description of the utility model, which will be further described in detail in the detailed implementation section. The description of the utility model does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the protection scope of the claimed technical solution.

[0022] The advantages and features of the present invention will be described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following drawings of the present invention are used as a part of the present invention to understand the present invention. The embodiments and descriptions thereof of the present invention are shown in the drawings to explain the principles of the present invention. In the drawings,

[0024] Figure 1 is a perspective view of an impeller according to an exemplary embodiment of the present invention;

[0025] Figure 2 is Figure 1 a sectional view of the impeller shown in the figure;

[0026] Figure 3 is Figure 1 an exploded view of the impeller shown in the figure;

[0027] Figure 4 is a perspective view of a blade according to an exemplary embodiment of the present utility model;

[0028] Figure 5 is Figure 4 a front view of the blade shown in the figure; and

[0029] Figure 6 is Figure 4 a sectional view of the blade shown in the figure.

[0030] Among them, the above-mentioned drawings include the following reference numerals:

[0031] 11, impeller; 100, blade; 110, inner surface; 120, outer surface; 130, protrusion; 131, protruding bottom wall; 140, recess; 141, recessed bottom wall; 150, air inlet side; 160, air outlet side; 170, pressing section; 180, connecting section; 200, impeller chassis; 210, through hole; 300, guide cover; 310, top wall; 400, shaft sleeve; 500, impeller top plate. Detailed implementation manners

[0032] In the following description, a large number of details are provided to enable a thorough understanding of the present utility model. However, those skilled in the art can understand that the following description only exemplarily shows the preferred embodiments of the present utility model, and the present utility model can be implemented without one or more of such details. In addition, in order to avoid confusion with the present utility model, some well-known technical features in the art are not described in detail.

[0033] According to one aspect of the present utility model, a blade is provided. The blade can be applied to any suitable component, including but not limited to an impeller assembly. Therefore, according to another aspect of the present utility model, an impeller assembly is provided. The impeller assembly can include an impeller and a driving member. The impeller can include a chassis and a plurality of blades of any of the types described below. The impeller assembly can be applied to any suitable device, including but not limited to a blower. Therefore, according to yet another aspect of the present utility model, a blower is provided. The blower can include a volute and any of the impeller assemblies described below, wherein the impeller can be disposed inside the volute and the driving member can be connected to the volute. The blower can be applied to any suitable equipment, including but not limited to a fume extractor. Therefore, according to yet another aspect of the present utility model, a fume extractor is provided. The fume extractor can include a box body and a blower, and the blower can be disposed inside the box body.

[0034] Blades can generally be applied to impeller assemblies. Refer to Figure 1 , Figure 2 and Figure 3 , the impeller assembly can include an impeller 11 and a driving member (not shown in the figure). The impeller 11 can include an impeller chassis 200 and a plurality of blades 100 of any of the types described below. The plurality of blades 100 can be arranged in a ring to form a blade ring, and the blade ring can be connected to the impeller chassis 200. In this way, the impeller 11 can be formed by connecting the blade ring to the impeller chassis 200. The driving member can have an output shaft, the impeller chassis 200 can be vertically connected to the output shaft, and the blade ring can have the output shaft as the central axis (axis C-C shown in the figure). When the output shaft of the driving member in the impeller assembly rotates, it can drive the impeller chassis 200 to rotate synchronously, thereby driving the impeller 11 to rotate. At this time, the plurality of blades 100 in the impeller 11 can rotate synchronously to drive the air flow.

[0035] Refer to Figure 4 , Figure 5 and Figure 6, the blade 100 may have opposite inner surface 110 and outer surface 120. A plurality of blades 100 may surround to form a cavity. The surface of the blade 100 facing the inside of the cavity is the inner surface 110, and the surface of the blade 100 facing the outside of the impeller 11 is the outer surface 120. A protruding portion 130 may protrude from the inner surface 110 of the blade 100 towards the outer surface 120, and a recessed portion 140 may be recessed from the outer surface 120 of the blade 100 towards the inner surface 110. Both the protruding portion 130 and the recessed portion 140 may be formed by press forming on the blade 100. The blade 100 may extend in a first direction (the illustrated direction X-X). For the elongated blade 100, the length direction of the blade 100 may be the first direction X-X. The protruding portion 130 and the recessed portion 140 may be arranged alternately in the first direction X-X, and there may be a gap between the protruding portion 130 and the recessed portion 140 in the first direction X-X. There may be a transition section with any shape and size between the protruding portion 130 and the recessed portion 140. Since the protruding portion 130 and the recessed portion 140 may be formed by press forming on the blade 100, during the processing, after the protruding portion 130 is formed by press forming on the blade 100, the recessed portion 140 may be formed by press forming on the blade 100 after a certain distance in the first direction X-X. The spaced part here may be the transition section, and the transition section here is consistent with the shape of the blade 100 before processing. For the straight blade 100, the transition section may be straight.

[0036] Among them, the blade 100 may have an air inlet flow side 150 and an air outlet flow side 160. When the impeller 11 rotates, it can drive the external gas to form an air flow into the cavity inside the impeller 11, and then flow to the outside of the impeller 11 from the flow path formed between adjacent blades 100 among the plurality of blades 100. When the air flow flows in the flow path, it may flow from the inside of the impeller 11 towards the outside of the impeller 11. Correspondingly, the air inlet flow side 150 on the blade 100 may face the cavity inside the impeller 11, and the air outlet flow side 160 on the blade 100 may be closer to the outside of the impeller 11 than the air inlet flow side 150. Both the protruding portion 130 and the recessed portion 140 may extend from the air inlet flow side 150 to the air outlet flow side 160. Such a protruding portion 130 and a recessed portion 140 may form a combing effect on the air flow flowing in the flow path formed between adjacent blades 100. Moreover, since both the protruding portion 130 and the recessed portion 140 may extend from the air inlet flow side 150 to the air outlet flow side 160, the air flow can be guided and combed by the protruding portion 130 and the recessed portion 140 throughout the whole process of flowing in the flow path. In this way, less eddy current and turbulent flow can be generated when the air flow flows in the flow path. When such an impeller 11 rotates, the aerodynamic noise generated by driving the air flow to flow is also smaller.

[0037] The blade 100 provided by the present utility model is provided with alternately arranged protruding portions 130 and recessed portions 140, and both the protruding portions 130 and the recessed portions 140 extend from the air inlet flow side 150 of the blade 100 to the air outlet flow side 160. When such a blade 100 drives the air flow, the protruding portions 130 and the recessed portions 140 can be regarded as combing the flowing air flow, and there can be fewer eddies generated by the air flow, so that the aerodynamic noise when such a blade 100 drives the air flow can be smaller.

[0038] In an embodiment of the present utility model, refer to Figure 4 , Figure 5 and Figure 6 , two adjacent protruding portions 130 can be centrosymmetric about the recessed portion 140 therebetween, and two adjacent recessed portions 140 can be centrosymmetric about the protruding portion 130 therebetween. Such a plurality of protruding portions 130 and a plurality of recessed portions 140 are alternately arranged, and the whole is more regular, so that the guiding and combing effect of such a blade 100 on the air flow in the blade channel is better.

[0039] In an embodiment of the present utility model, refer to Figure 4 , Figure 5 and Figure 6 , the protruding portion 130 can include a protruding bottom wall 131 away from the inner surface 110, the recessed portion 140 can include a recessed bottom wall 141 away from the outer surface 120, and along the first direction X-X, the length of the protruding bottom wall 131 is equal to the length of the recessed bottom wall 141. As shown in the figure, the length of the protruding bottom wall 131 and the length of the recessed bottom wall 141 can both be the bottom wall length M. The distribution of the protruding portions 130 and the recessed portions 140 on such a blade 100 can be more regular, and the guiding and combing effect of a plurality of protruding portions 130 and a plurality of recessed portions 140 on the air flow in the blade channel is better. Moreover, the length of the protruding bottom wall 131 is equal to the length of the recessed bottom wall 141, so that the structure of the blade 100 is simpler and easier to process and form.

[0040] Exemplarily, refer to Figure 4 , Figure 5 and Figure 6, the protruding portion 130 may include a protruding bottom wall 131 away from the inner surface 110, and the recessed portion 140 may include a recessed bottom wall 141 away from the outer surface 120. In the thickness direction of the blade 100, the thickness of the protruding bottom wall 131 is equal to the thickness of the recessed bottom wall 141. For the blade 100 with an arc-shaped cross-section, any point on the blade 100 may correspond to the center of the circle, and the thickness direction corresponding to this point may be parallel to the normal line passing through this point and the center of the circle. Therefore, the blade 100 with an arc-shaped cross-section may have multiple thickness directions, and it can be considered that each thickness direction is perpendicular to the blade 100. The thickness of the protruding bottom wall 131 may be considered as the distance from the farthest point from the outer surface 120 on the protruding bottom wall 131 to the outer surface 120, and the thickness of the recessed bottom wall 141 may be considered as the distance from the farthest point from the inner surface 110 on the recessed bottom wall 141 to the inner surface 110. As shown in the figure, the thicknesses of the protruding bottom wall 131 and the recessed bottom wall 141 may both be the bottom wall thickness T2. Since the protruding portion 130 and the recessed portion 140 may be formed by pressing on the blade 100, the thicker the thickness of the protruding bottom wall 131, the deeper the groove formed by the protruding portion 130. Similarly, the thicker the thickness of the recessed bottom wall 141, the deeper the groove formed by the recessed portion 140. When the thicknesses of the protruding bottom wall 131 and the recessed bottom wall 141 are equal, the groove depths formed by the protruding portion 130 and the recessed portion 140 are approximately the same, and the guiding and combing effects of the protruding portion 130 and the recessed portion 140 on the air flow are approximately the same. The overall guiding and combing effect on the air flow in the blade passage can be better, and the guiding of the air flow in the blade passage is also more uniform. Moreover, such a blade 100 is easier to process and form, and the overall structure is also simpler and easier to implement.

[0041] Exemplarily, referring to Figure 4 and Figure 5 , in the thickness direction of the blade 100, the blade 100 may have a blade thickness T1, the thicknesses of the protruding bottom wall 131 and the recessed bottom wall 141 may both be the bottom wall thickness T2, and the blade thickness T1 and the bottom wall thickness T2 may satisfy T1 = T2. Since the protruding portion 130 and the recessed portion 140 may be formed by pressing on the blade 100, such a blade 100 has a simpler structure, and the overall structure of the impeller 11 is also simpler and easier to implement.

[0042] Exemplarily, along the first direction X-X, the length of the protruding bottom wall 131 and the length of the recessed bottom wall 141 may be equal. As shown in the figure, the lengths of the protruding bottom wall 131 and the recessed bottom wall 141 may both be the bottom wall length M. The distribution of the protruding portion 130 and the recessed portion 140 on such a blade 100 can be more regular, and the guiding and combing effects of the multiple protruding portions 130 and the multiple recessed portions 140 on the air flow in the blade passage are better. Moreover, since the lengths of the protruding bottom wall 131 and the recessed bottom wall 141 are equal, the structure of the blade 100 is simpler and it is also easier to process and form.

[0043] Exemplarily, refer to Figure 4 and Figure 5 , along the first direction X-X, the lengths of the protruding bottom wall 131 and the recessed bottom wall 141 can both be the bottom wall length M. In the thickness direction, the blade 100 has a blade thickness T1, and the bottom wall length M and the blade thickness T1 satisfy M≥2T1. When M is less than 2T1, the number of the protruding portions 130 and the recessed portions 140 on the blade 100 is excessive, the structure of the blade 100 is too complex, and the positions of the shape changes in the blade passage are too many. As a result, such a blade 100 has a poor guiding and combing effect on the airflow in the blade passage, and such a blade 100 may have a problem of insufficient strength. When M≥2T1, such a blade 100 can have a better guiding and combing effect on the airflow in the blade passage, and the overall strength of such a blade 100 can be better.

[0044] Exemplarily, refer to Figure 4 , Figure 5 and Figure 6 , the blade 100 can include a profiled section 170 and two connecting sections 180 in the first direction X-X. The two connecting sections 180 can be located on opposite sides of the profiled section 170 in the first direction X-X. The protruding portions 130 and the recessed portions 140 can both be provided on the profiled section 170. Refer to Figure 1 , Figure 2 and Figure 3 , the impeller 11 can include an impeller top disc 500 and an impeller bottom disc 200. The blade 100 can be provided between the impeller top disc 500 and the impeller bottom disc 200. One of the two connecting sections 180 on the blade 100 can be connected to the impeller top disc 500, and the other can be connected to the impeller bottom disc 200. When such a blade 100 is applied to an impeller assembly, it is equivalent to that the profiled section 170 is respectively connected to the impeller top disc 500 and the impeller bottom disc 200 through the two connecting sections 180. Compared with the profiled section 170 directly connected to the impeller top disc 500 and the impeller bottom disc 200 at both ends in the first direction X-X, since no protruding portions 130 and recessed portions 140 are provided at the connection, the connection can be more stable. Such a blade 100 can be connected to the outside through the two connecting sections 180, and the profiled section 170 does not need to be directly connected to the outside. No protruding portions 130 and recessed portions 140 are provided on the connecting section 180. Therefore, when the connecting section 180 is connected to the outside, it can have better stability, and thus the stability of the blade 100 connected to the outside through the connecting section 180 can also be better.

[0045] Exemplarily, refer to Figure 4 , Figure 5 and Figure 6, the corrugated section 170 may have a corrugated length L1 in the first direction X-X, the blade 100 may have a blade length L2 in the first direction X-X, and the corrugated length L1 and the blade length L2 may satisfy L1≥0.8L2. When L1≥0.8L2, it can ensure that the corrugated section 170 on the blade 100 has sufficient length, so that it can ensure that the blade 100 can have a better guiding and combing effect on the airflow in the blade passage.

[0046] Exemplarily, referring to Figure 4 , Figure 5 and Figure 6 , the connecting section 180 may have a connecting length L3 in the first direction X-X, the blade 100 may have a blade length L2 in the first direction X-X, and the connecting length L3 and the blade length L2 satisfy L3≥0.1L2. When L3≥0.1L2, it can ensure that the two connecting sections 180 on the blade 100 have sufficient length. When the blade 100 is connected to the outside through such connecting sections 180, it can be more stable, and since the connecting section 180 has a certain length, it is also more convenient when the blade 100 is connected to the outside. When such a blade 100 is applied to the impeller assembly, the two connecting sections 180 in the blade 100 are respectively connected to the impeller top disc 500 and the impeller bottom disc 200, so that the blade 100 can be more stable when connected to the impeller top disc 500 and the impeller bottom disc 200, and thus the overall stability of the impeller 11 can be better.

[0047] For the impeller assembly provided by the present utility model, exemplarily, referring to Figure 1 , Figure 2 and Figure 3 , the impeller assembly may include a fairing 300. The blade ring and the impeller bottom disc 200 may enclose to form a cavity. The fairing 300 may be detachably connected to the impeller bottom disc 200, and at least part of the fairing 300 may be located inside the cavity. After the airflow enters the cavity inside the impeller 11, the airflow velocity in the middle region of the cavity is small, while the airflow velocity near the blade 100 is large. Under such a velocity difference, turbulence is likely to occur. The setting of the fairing 300 can reduce the size of the area with velocity difference, so that less turbulence is generated when the airflow flows inside the impeller 11, and less aerodynamic noise is generated by the airflow flowing inside the impeller 11. Moreover, since the fairing 300 is detachably connected to the impeller bottom disc 200, fairings 300 of different sizes and shapes can be replaced according to needs, so that the applicable range of such an impeller 11 can be wider. The fairing 300 detachably connected to the impeller bottom disc 200 is also easier to disassemble, replace, repair or clean.

[0048] Exemplarily, referring to Figure 1 , Figure 2 and Figure 3, the fairing 300 may include a top wall 310 away from the impeller chassis 200. In a plane perpendicular to the first direction X-X, the impeller 11 may have an impeller diameter D1, the diameter of the top wall 310 may be D2, and the impeller diameter D1 and the diameter D2 of the top wall 310 of the fairing 300 may satisfy D2 ≤ 0.3D1. When the diameter D2 of the top wall 310 of the fairing 300 is too large, it may cause a large interference to the external air flow entering the internal cavity of the impeller 11. When D2 ≤ 0.3D1, the interference of the fairing 300 to the external air flow entering the internal cavity of the impeller 11 can be reduced.

[0049] Exemplarily, refer to Figure 1 、 Figure 2 and Figure 3 , in the first direction X-X, the impeller 11 may have an impeller thickness, the fairing 300 may have a fairing thickness, and the fairing thickness may not be greater than the impeller thickness. When the fairing 300 extends outside the impeller 11, it may cause interference to the external air flow entering the internal cavity of the impeller 11. Moreover, when the impeller 11 is in use, taking the impeller 11 applied to a fan as an example, the impeller 11 may be connected with a wind guiding ring, and the fairing 300 extending outside the impeller 11 may interfere with the wind guiding ring. When the fairing thickness is not greater than the impeller thickness, the fairing 300 can be entirely located within the internal cavity of the impeller 11, thereby avoiding the fairing 300 from interfering with the external air flow entering the internal cavity of the impeller 11 and also avoiding the fairing 300 from interfering with external factors.

[0050] Exemplarily, refer to Figure 3 , a through hole 210 may be provided in the middle of the impeller chassis 200, and a bushing 400 connecting the output shaft may be passed through the through hole 210. Since the through hole 210 is provided on the impeller chassis 200, the bushing 400 can be riveted to the impeller chassis 200 by solid rivets. The bushing 400 can also be connected to the through hole 210 on the impeller chassis 200 in any other suitable form. The connection between the impeller chassis 200 and the output shaft of the driving member through the bushing 400 is very simple and convenient, so that the connection between the impeller chassis 200 and the output shaft can be more simple, and the overall structure of the impeller assembly can be more simple and easy to implement.

[0051] In the description of the present utility model, it should be understood that orientation terms such as "front", "rear", "upper", "lower", "left", "right", "lateral", "vertical", "perpendicular", "horizontal", "top", "bottom", etc. usually indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary explanation, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model; the orientation terms "inner" and "outer" refer to the inside and outside relative to the contour of each component itself.

[0052] For ease of description, regional relative terms such as "above...", "over...", "on the upper surface of...", "upper...", etc. can be used here to describe the regional positional relationship between one or more components or features shown in the drawings and other components or features. It should be understood that regional relative terms not only include the orientation of the components described in the drawings but also different orientations during use or operation. For example, if the components in the drawings are inverted as a whole, the components "above other components or features" or "over other components or features" will include the situation where the components are "below other components or structures" or "under other components or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". In addition, these components or features can also be positioned at other different angles (such as rotated 90 degrees or other angles), and this article is intended to cover all such situations.

[0053] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present utility model. As used here, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, components, assemblies, and / or combinations thereof.

[0054] It should be noted that the terms "first", "second", etc. in the description, claims, and above-mentioned drawings of the present utility model are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described here can be implemented in an order other than those illustrated or described here.

[0055] The present utility model has been described through the above embodiments. However, it should be understood that the above embodiments are only for the purpose of illustration and example, and are not intended to limit the present utility model to the scope of the described embodiments. In addition, those skilled in the art can understand that the present utility model is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present utility model, and these variations and modifications all fall within the scope of protection required by the present utility model. The scope of protection of the present utility model is defined by the appended claims and their equivalent scope.

Claims

1. A blade, characterized in that, The blade has opposite inner and outer surfaces. There are protruding portions protruding from the inner surface towards the outer surface on the blade, and recessed portions recessed from the outer surface towards the inner surface on the blade. The blade extends in a first direction. The protruding portions and the recessed portions are alternately arranged in the first direction and there is a gap between the protruding portions and the recessed portions in the first direction. Wherein, the blade has an air inlet flow side and an air outlet flow side, and both the protruding portion and the recessed portion extend from the air inlet flow side to the air outlet flow side.

2. The blade according to claim 1, characterized in that, Two adjacent protruding portions are centrosymmetric about the recessed portion between them, and two adjacent recessed portions are centrosymmetric about the protruding portion between them.

3. The blade according to claim 1, characterized in that, The protruding portion includes a protruding bottom wall away from the inner surface, and the recessed portion includes a recessed bottom wall away from the outer surface. In the first direction, the length of the protruding bottom wall is equal to the length of the recessed bottom wall.

4. The blade according to claim 1, wherein The protruding portion includes a protruding bottom wall away from the inner surface, and the recessed portion includes a recessed bottom wall away from the outer surface. In the thickness direction of the blade, the thickness of the protruding bottom wall is equal to the thickness of the recessed bottom wall.

5. The blade according to claim 4, characterized in that, In the thickness direction, the blade has a blade thickness T1, and the thicknesses of both the protruding bottom wall and the recessed bottom wall are a bottom wall thickness T2. The blade thickness T1 and the bottom wall thickness T2 satisfy T1 = T2.

6. The blade according to claim 4, characterized in that, In the first direction, the length of the protruding bottom wall is equal to the length of the recessed bottom wall.

7. The blade according to claim 6, characterized in that, In the first direction, the lengths of both the protruding bottom wall and the recessed bottom wall are a bottom wall length M. In the thickness direction, the blade has a blade thickness T1. The bottom wall length M and the blade thickness T1 satisfy M ≥ 2T1.

8. The blade according to claim 1, characterized in that, The blade includes a profiled section and two connecting sections in the first direction. The two connecting sections are located on opposite sides of the profiled section in the first direction, and the protruding portions and the recessed portions are both arranged on the profiled section.

9. The blade according to claim 8, characterized in that, The profiled section has a profiled length L1 in the first direction, and the blade has a blade length L2 in the first direction. The profiled length L1 and the blade length L2 satisfy L1 ≥ 0.8L2.

10. The blade according to claim 8, characterized in that, The connecting section has a connecting length L3 in the first direction, and the blade has a blade length L2 in the first direction. The connecting length L3 and the blade length L2 satisfy L3 ≥ 0.1L2.

11. An impeller assembly, characterized in that, It includes a driving member and an impeller. The impeller includes an impeller chassis and a plurality of blades as described in any one of claims 1-10. The plurality of blades are arranged in a ring to form a blade ring and the blade ring is connected to the impeller chassis. The driving member has an output shaft, the impeller chassis is vertically connected to the output shaft, and the blade ring takes the output shaft as the central axis.

12. The impeller assembly according to claim 11, characterized in that, The impeller assembly further includes a fairing. A cavity is formed by enclosing the blade ring and the impeller chassis. The fairing is detachably connected to the impeller chassis, and at least part of the fairing is located in the cavity.

13. The impeller assembly according to claim 12, wherein The fairing includes a top wall away from the impeller chassis. In a plane perpendicular to the first direction, the impeller has an impeller diameter D1, and the diameter of the top wall is D2. The impeller diameter D1 and the diameter D2 of the top wall satisfy D2 ≤ 0.3D1.

14. The impeller assembly according to claim 12, wherein, A through hole is provided in the middle of the impeller chassis, and a shaft sleeve connecting the output shaft is inserted through the through hole.

15. A fan, characterized in that, It includes a volute and an impeller assembly as described in any one of claims 11-14. The impeller is arranged inside the volute, and the driving member is connected to the volute.

16. A range hood, characterized in that, It includes a box body and a blower as described in claim 15. The blower is arranged inside the box body.

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