Blade, impeller and range hood

Abstract

The blade is provided with an air inlet side edge and an air outlet side edge, in the length direction, the air inlet side edge is sequentially provided with a first air inlet edge, a second air inlet edge and a third air inlet edge, and the air outlet side edge is sequentially provided with a first air outlet edge, a second air outlet edge and a third air outlet edge. The length of the second air outlet edge is smaller than that of the second air inlet edge, a plurality of tooth-shaped structures are formed on the first air inlet edge and the third air inlet edge, and wave-shaped structures are formed on the first air outlet edge and the third air outlet edge. When the blade is applied to the range hood, the air flow of an air inlet and an air outlet of an impeller can be effectively adjusted, turbulent flow is reduced, and therefore periodic impact on a volute tongue is reduced, noise is lowered, the service life of the range hood is prolonged, and the overall performance of the range hood is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of range hood technology, specifically to a blade, an impeller, and a range hood. Background Technology

[0002] During operation, the motor directly drives the impeller to rotate, causing the axially drawn-in fumes and other gases to be thrown radially out from the impeller's center under centrifugal force. However, in traditional designs, the airflow thrown out by the rotating impeller periodically impacts the volute. This periodic impact not only causes significant noise but can also induce vibrations in the range hood, affecting the user experience. Furthermore, long-term periodic impacts can damage the range hood, reducing its lifespan. Utility Model Content

[0003] In order to at least partially solve the problems existing in the prior art, according to one aspect of the present invention, a blade is provided, the technical solution of which is as follows.

[0004] The blade has an inlet side edge and an outlet side edge. In the length direction, the inlet side edge is provided with a first inlet edge, a second inlet edge and a third inlet edge in sequence, and the outlet side edge is provided with a first outlet edge, a second outlet edge and a third outlet edge in sequence. The length of the second outlet edge is shorter than the length of the second inlet edge. Multiple tooth-shaped structures are formed on the first inlet edge and the third inlet edge, and wavy structures are formed on the first outlet edge and the third outlet edge.

[0005] The blade of this invention features multiple toothed structures on both the first and third air inlets and a wavy structure on both the second and third air outlets, as the length of the second air outlet is shorter than the length of the second air inlet. This allows for the adjustment of airflow. When this blade is applied to a range hood, it can effectively adjust the gas flow at the impeller inlet and outlet, reduce turbulence, thereby reducing the periodic impact on the volute tongue, lowering noise, extending the service life of the range hood, and enhancing its overall performance.

[0006] For example, the blade has a length H, and the second inlet edge has a length H1, where H1 ≤ H / 5. This configuration effectively adjusts the airflow at the impeller inlet when applied to the impeller, thereby enhancing the impeller's working efficiency and ultimately improving overall performance.

[0007] For example, the second air outlet flange has a length H2, where H2 ≤ H / 6. This configuration, when applied to the impeller, effectively adjusts the airflow at the impeller outlet, thereby reducing the periodic impact of the impeller on the volute within the range hood, thus lowering noise and improving the user experience.

[0008] For example, the first outlet flange has a length H3, and the third outlet flange has a length H4, with H3 / H4 being 1 to 3. This configuration, when applied to an impeller, significantly reduces the periodic airflow impact on the volute tongue by adjusting the airflow rate at the impeller's outlet, further reducing noise.

[0009] For example, the first air inlet flange has a length of H5, and the third air inlet flange has a length of H6, with H5 / H6 being 1 to 3. This configuration, when applied to an impeller, further enhances the impeller's working efficiency by adjusting the airflow rate at the impeller's inlet, thereby improving overall performance.

[0010] For example, the blade has a thickness T, and the corrugated structure has a wavelength T1, with T1 / T being 3 to 15. This configuration provides the corrugated structure with sufficient structural strength and rigidity, improving its bending resistance and making the blade more stable during high-speed rotation.

[0011] For example, the blade has a thickness T, and the corrugated structure has an amplitude T2, with T2 / T being 15 to 25. This configuration provides better stress distribution, reduces local stress concentration, and thus extends the blade's service life.

[0012] For example, the blade has a thickness T, and the tooth structure has a height T3, with T3 / T being 4 to 10. This configuration improves the stiffness and strength of the tooth structure and extends the service life of the blade.

[0013] For example, along the length direction, multiple toothed structures on the first inlet edge are connected sequentially, and multiple toothed structures on the third inlet edge are connected sequentially. This arrangement, when applied to an impeller, further guides the airflow to enter the impeller more evenly from the inlet, allowing the airflow to flow more smoothly along the blade surface, thereby further reducing turbulence.

[0014] For example, the toothed structure has a width T4, and adjacent toothed structures have a center distance T5, where T3 = T4 = T5. This configuration ensures the rigidity of the toothed structure, improves the blade's resistance to deformation, and allows stress to be evenly distributed among the teeth, effectively extending the blade's service life. Furthermore, when applied to an impeller, each toothed structure has the same impact on the incoming airflow, ensuring that the airflow is guided more evenly and smoothly into the impeller's inlet, thereby enhancing the impeller's efficiency.

[0015] For example, the blade includes a first section, a second section, and a third section, which are connected sequentially along their length. The end of the first section furthest from the second section has an unfolded width K1, and the end of the third section furthest from the second section has an unfolded width K3, where K1 = K3. This configuration, when applied to the impeller, reduces turbulence during air intake and exhaust at the ends of the first and third sections furthest from the second section, thereby reducing noise and improving overall operational stability.

[0016] For example, the second section has an expansion width K2, where K2 / K1 = K2 / K3 = k, and k is 0.7 to 0.9. With this setting, when applied to the impeller, when k is within this range, the turbulence phenomenon occurring during air intake and exhaust at the ends of the first and third sections furthest from the second section is effectively reduced, thereby reducing noise and improving the overall operational stability.

[0017] According to another aspect of this utility model, an impeller is provided, which includes an upper plate, a middle plate, a lower plate, and a plurality of blades as described above. The plurality of blades are arranged circumferentially around the middle plate, each blade passing through the middle plate and connected at both ends to the upper plate and the lower plate, respectively. An airflow channel is formed between two adjacent blades, and the airflow channel forms an air inlet on the air inlet side and an air outlet on the air outlet side. Since the blades described above have the aforementioned beneficial effects, the impeller including the blades described above also has the aforementioned beneficial effects, which will not be elaborated further here.

[0018] For example, the blade has an arc-shaped cross-section. The line connecting the center of the circle opposite the blade and the center of the central disk is defined as the first line, and the line connecting the inlet side edge and the center of the central disk is defined as the second line. An angle r is formed between the first and second lines, and the blade has an inlet angle θ at the inlet side edge, where (4-12)r = θ. This configuration effectively guides the airflow into the inlet, enhancing intake efficiency, improving airflow characteristics, reducing turbulence and impact within the impeller, and thus improving overall operational stability.

[0019] According to another aspect of this utility model, a range hood is provided, which includes a volute and an impeller as described above, the impeller being disposed within the volute. Since the impeller described above has the aforementioned beneficial effects, the range hood including the impeller described above also has the aforementioned beneficial effects, which will not be elaborated further here.

[0020] This utility model description introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This utility model description is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0021] The advantages and features of this utility model will be described in detail below with reference to the accompanying drawings. Attached Figure Description

[0022] The following drawings, which are incorporated herein by reference as part of this invention, are provided for understanding the invention. The drawings illustrate embodiments of the invention and their descriptions, serving to explain the principles of the invention. In the drawings,

[0023] Figure 1 A perspective view of an impeller as an exemplary embodiment of the present invention;

[0024] Figure 2 for Figure 1 The impeller shown is a top view;

[0025] Figure 3 for Figure 1 The exploded view of the impeller shown;

[0026] Figure 4 for Figure 1 The unfolded diagram of the leaf blade;

[0027] Figure 5 for Figure 4 A partially enlarged schematic diagram of the wavy structure on the blade shown;

[0028] Figure 6 for Figure 4 A partially enlarged schematic diagram of the toothed structure on the blade shown.

[0029] The above figures include the following reference numerals:

[0030] 1. Impeller; 10. Blade; 110. Inlet side edge; 111. First inlet edge; 112. Second inlet edge; 113. Third inlet edge; 120. Outlet side edge; 121. First outlet edge; 122. Second outlet edge; 123. Third outlet edge; 130. First section; 140. Second section; 150. Third section; 160. Toothed structure; 170. Wavy structure; 180. First locking part; 190. Second locking part; 20. Upper plate; 210. First locking mating part; 30. Middle plate; 310. Through hole; 40. Lower plate; 410. Second locking mating part; 50. Airflow channel; 510. Air inlet; 520. Air outlet. Detailed Implementation

[0031] In the following description, numerous details are provided to enable a thorough understanding of the present invention. However, those skilled in the art will appreciate that the following description merely illustrates preferred embodiments of the present invention, which may be practiced without one or more of these details. Furthermore, to avoid confusion with the present invention, some technical features well-known in the art have not been described in detail.

[0032] To fully understand the embodiments of this utility model, a detailed structure will be presented in the following description. Obviously, the implementation of the embodiments of this utility model is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0033] An embodiment of this utility model provides a blade. This blade can be applied to an impeller, which can be used in a range hood. The blade according to an embodiment of this utility model will be described in detail below with reference to the accompanying drawings.

[0034] See also Figure 1 and Figure 4 The blade 10 may have an inlet side edge 110 and an outlet side edge 120. Along its length, the inlet side edge 110 may have a first inlet edge 111, a second inlet edge 112, and a third inlet edge 113 arranged sequentially. The outlet side edge 120 may have a first outlet edge 121, a second outlet edge 122, and a third outlet edge 123 arranged sequentially. The length of the second outlet edge 122 may be less than the length of the second inlet edge 112. Multiple toothed structures 160 may be formed on both the first inlet edge 111 and the third inlet edge 113. A wave-shaped structure 170 may be formed on both the first outlet edge 121 and the third outlet edge 123. Specifically, the wave-shaped structure 170 may be a periodically undulating structure, where all parts of the waves may be identical. However, it is also possible that the wave-shaped structure 170 is a partially periodically undulating structure or a non-periodic undulating structure, where all waves may be partially identical or entirely different. It should be noted that when multiple blades 10 are combined to form an impeller 1, the multiple blades 10 are spaced apart in the circumferential direction, and an airflow channel 50 can be formed between two adjacent blades 10. The airflow channel 50 can form an air inlet 510 on the side where the air inlet edge 110 is located, and an air outlet 520 on the side where the air outlet edge 120 is located. The air inlet edge 110 can be the edge of the blade 10 corresponding to the air inlet 510 (the air inlet edge 110 corresponds to the inner side of the impeller 1), and the air outlet edge 120 can be the edge of the blade 10 corresponding to the air outlet 520 (the air outlet edge 120 corresponds to the outer side of the impeller 1).

[0035] The blade 10 of this invention, because the length of the second air outlet 122 is less than the length of the second air inlet 112, has multiple toothed structures 160 formed on both the first air inlet 111 and the third air inlet 113, and wavy structures 170 formed on both the first air outlet 121 and the third air outlet 123, thus achieving adjustment of airflow. When this blade 10 is applied to a range hood, it can effectively adjust the airflow at the air inlet 510 and the air outlet 520 of the impeller 1, reduce turbulence, thereby reducing the periodic impact on the volute tongue, reducing noise, and thus extending the service life of the range hood and enhancing its overall performance.

[0036] In some embodiments, such as Figure 5 Each wave in the wave-shaped structure 170 can be sequentially connected. This enhances the strength and rigidity of the wave-shaped structure 170 itself, making the entire blade 10 more stable. Of course, multiple waves of the wave-shaped structure 170 can be grouped together, and each group of waves can be spaced apart along the air outlet side edge 120. It is also possible that each wave of the wave-shaped structure 170 can be spaced apart along the air outlet side edge 120.

[0037] See also Figure 1 , Figure 3 and Figure 4 The second inlet flange 112 can have a length H1, where H1 ≤ H / 5. When applied to impeller 1, the second inlet flange 112 corresponds to the central disc 30. In this way, the airflow rate at the impeller 1 inlet 510 is effectively adjusted, thereby enhancing the working efficiency of impeller 1 and thus improving overall performance.

[0038] In some embodiments, the second air inlet flange 112 may also be formed into a straight structure, so that it corresponds to other structures (such as the center plate 30), and the straight structure can also reduce the obstruction of airflow by other structures connected to it.

[0039] See again Figure 1 and Figure 4 The blade 10 can have a length H, and the second air outlet 122 can have a length H2, where H2 ≤ H / 6. Thus, when applied to the impeller 1, it effectively adjusts the airflow at the impeller 1 outlet 520, thereby reducing the periodic impact of the impeller 1 on the volute in the range hood, thus reducing noise and improving the user experience.

[0040] In some embodiments, the second air outlet flange 122 can be formed into a straight structure to facilitate connection with other structures, and the straight structure can also reduce the obstruction of airflow by other structures connected to it.

[0041] See again Figure 1 and Figure 4The first outlet flange 121 can have a length H3, and the third outlet flange 123 can have a length H4. The ratio of H3 / H4 can be 1 to 3, for example, H3 / H4 can be 1, 2, 3, etc. Understandably, the length H3 of the first outlet flange 121 can be greater than or equal to the length H4 of the third outlet flange 123. Thus, when applied to impeller 1, by adjusting the airflow rate at the outlet 520 of impeller 1, the periodic airflow impact on the volute tongue is greatly reduced, further reducing noise.

[0042] See again Figure 1 and Figure 4 The first inlet flange 111 can have a length H5, and the third inlet flange 113 can have a length H6. The ratio of H5 to H6 can be 1 to 3, for example, H5 / H6 can be 1, 2, or 3. Understandably, the length H5 of the first inlet flange 111 can be greater than or equal to the length H6 of the third inlet flange 113. Thus, when applied to impeller 1, by adjusting the airflow rate at the impeller 1's inlet 510, the working efficiency of impeller 1 is further enhanced, thereby improving overall performance.

[0043] See also Figures 3 to 5 The blade 10 can have a thickness T, and the corrugated structure 170 can have a wavelength T1, where T1 / T can be 3 to 15, for example, T1 / T can be 3, 9, or 15. Understandably, the wavelength T1 of the corrugated structure 170 can be greater than the thickness T of the blade 10. Thus, the corrugated structure 170 has sufficient structural strength and rigidity, improving its bending resistance and making the blade 10 more stable during high-speed rotation.

[0044] See again Figures 3 to 5 The blade 10 can have a thickness T, and the corrugated structure 170 can have an amplitude T2, where T2 / T can be 15 to 25, for example, 15, 20, or 25. Understandably, the amplitude T2 of the corrugated structure 170 can be greater than the thickness T of the blade 10. This provides better stress distribution, reduces localized stress concentration, and thus extends the service life of the blade 10.

[0045] See also Figure 3 , Figure 4 and Figure 6 The blade 10 can have a thickness T, and the toothed structure 160 can have a height T3. The ratio T3 / T can be 4 to 10, for example, T3 / T can be 4, 7, or 10. Understandably, the height T3 of the toothed structure 160 can be greater than the thickness T of the blade 10. This improves the stiffness and strength of the toothed structure 160 and extends the service life of the blade 10.

[0046] See also Figure 1 , Figure 4 and Figure 6 Along its length, multiple toothed structures 160 on the first inlet flange 111 can be connected sequentially. Similarly, multiple toothed structures 160 on the third inlet flange 113 can be connected sequentially. This allows, when applied to the impeller 1, to further guide the airflow more evenly into the impeller 1 from the inlet 510, enabling the airflow to flow more smoothly along the surface of the blades 10, thereby further reducing turbulence. Of course, each toothed structure 160 can be spaced apart along the inlet flange 110. It is also possible for multiple toothed structures 160 to form a group, with each group of toothed structures 160 spaced apart along the inlet flange 110.

[0047] See again Figure 3 , Figure 4 and Figure 6 The toothed structure 160 can have a width T4, and adjacent toothed structures 160 can have a center distance T5, where T3 = T4 = T5. Understandably, each toothed structure 160 has the same dimensions, and multiple toothed structures 160 are evenly distributed. This ensures, on the one hand, the rigidity of the toothed structure 160, improves the deformation resistance of the blade 10, and allows stress to be evenly distributed among the teeth, effectively extending the service life of the blade 10. On the other hand, when applied to the impeller 1, each toothed structure 160 has the same impact on the incoming airflow, ensuring that the airflow is guided more evenly and smoothly into the impeller 1's inlet 510, thereby enhancing the impeller 1's working efficiency. Of course, it is possible that the dimensions of each toothed structure 160 are partially or entirely different, and that multiple toothed structures 160 are not evenly distributed.

[0048] See again Figure 1 , Figure 3 and Figure 4The blade 10 may include a first segment 130, a second segment 140, and a third segment 150. The first segment 130, second segment 140, and third segment 150 may be sequentially connected in the length direction. The first segment 130 may gradually decrease in size from one end near the second segment 140 to the end far from the second segment 140. Understandably, the width of the first segment 130 may gradually decrease from one end near the second segment 140 to the end far from the second segment 140. The third segment 150 may gradually decrease in size from one end near the second segment 140 to the end far from the second segment 140. The width of the third segment 150 may gradually decrease from one end near the second segment 140 to the end far from the second segment 140. A first air inlet flange 111 and a first air outlet flange 121 may be respectively disposed on both sides of the first segment 130. A second air inlet flange 112 and a second air outlet flange 122 may be respectively disposed on both sides of the second segment 140. A third air inlet flange 113 and a third air outlet flange 123 may be respectively disposed on both sides of the third segment 150. The end of the first section 130 furthest from the second section 140 can have an expansion width K1, and the end of the third section 150 furthest from the second section 140 can have an expansion width K3, where K1 = K3. Thus, when applied to impeller 1, this reduces turbulence during air intake and exhaust at the ends of the first section 130 and the third section 150 furthest from the second section 140, thereby reducing noise and improving overall operational stability.

[0049] See again Figure 1 , Figure 3 and Figure 4 The second segment 140 can have an expansion width K2, where K2 / K1 = K2 / K3 = k, and k can be 0.7 to 0.9, for example, k can be 0.7, 0.8, or 0.9. Thus, when applied to impeller 1, when k is within this range, it effectively reduces turbulence during air intake and exhaust at the ends of the first segment 130 and the third segment 150 that are furthest from the second segment 140, thereby reducing noise and improving overall operational stability.

[0050] According to another aspect of the present invention, an impeller 1 is provided. (See also...) Figures 1 to 3The impeller 1 may include an upper disk 20, a middle disk 30, a lower disk 40, and multiple blades 10 as described above. The multiple blades 10 are spaced apart circumferentially along the middle disk 30, and an airflow channel 50 can be formed between adjacent blades 10. The airflow channel 50 can form an air inlet 510 on the side where the air inlet edge 110 is located, and an air outlet 520 on the side where the air outlet edge 120 is located. It should be noted that the upper disk 20, middle disk 30, and lower disk 40 can all be disc-shaped, with the air inlet edges 110 and the air outlet edges 120 of the multiple blades 10 located on the same circumference. This facilitates uniform airflow, reduces noise, and improves working efficiency. Each blade 10 passes through the middle disk 30, and its two ends are connected to the upper disk 20 and the lower disk 40, respectively. Specifically, the first segment 130 can be connected to the upper disk 20. The second segment 140 can be connected to the middle disk 30. The third segment 150 can be connected to the lower disk 40. Since the blade 10 described above has the aforementioned beneficial effects, the impeller 1 including the blade 10 described above also has the aforementioned beneficial effects, which will not be elaborated further here.

[0051] In some embodiments, in conjunction with reference Figure 3 and Figure 4The first segment 130, at its end furthest from the second segment 140, may have a first locking part 180. The upper plate 20 may have a first locking engagement part 210, which can engage with the first locking part 180. The middle plate 30 may have a through hole 310, through which the second segment 140 can pass. The third segment 150, at its end furthest from the second segment 140, may have a second locking part 190. The lower plate 40 may have a second locking engagement part 410, which can engage with the second locking part 190. Specifically, the first locking part 180 may be a protrusion extending from the end of the first segment 130 furthest from the second segment 140. The first locking engagement part 210 may be a locking groove. The first locking parts 180 and 210 may be provided in a one-to-one correspondence. Since the upper plate 20 needs to connect with multiple blades 10, multiple first locking engagement parts 210 can be provided on the upper plate 20, and the multiple first locking engagement parts 210 are arranged circumferentially on the upper plate 20 at intervals. The second locking part 190 can be a protrusion extending from the end of the third segment 150 away from the second segment 140. The second locking engagement part 410 can be a locking groove. The second locking part 190 and the second locking engagement part 410 can be provided one-to-one. Since the lower plate 40 also needs to connect with multiple blades 10, multiple second locking engagement parts 410 can be provided on the lower plate 40, and the multiple second locking engagement parts 410 are arranged circumferentially on the lower plate 40 at intervals. The first locking parts 180 and the second locking parts 190 can have the same shape to facilitate production and processing. There can be multiple through holes 310, and the multiple through holes 310 can be arranged circumferentially at intervals on the middle plate 30. This not only ensures the stability of the connection between the blade 10 and the upper plate 20, middle plate 30 and lower plate 40, but also facilitates installation or disassembly, and makes it convenient to clean or maintain the blade 10, upper plate 20, middle plate 30 and lower plate 40.

[0052] See also Figure 1 and Figure 2 The cross-section of blade 10 can be arc-shaped. The line connecting the center of the circle opposite blade 10 and the center of the central disk 30 is defined as the first line, and the line connecting the inlet side edge 110 and the center of the central disk 30 is defined as the second line. An angle r is formed between the first and second lines. The relationship between angle r and the inlet angle θ can be: (4~12)r = θ, for example, θ = 4r, θ = 6r, θ = 8r, θ = 12r, etc. Thus, by setting the above relationship between angle r and inlet angle θ, airflow can be effectively guided into the inlet 510, enhancing intake efficiency, improving airflow characteristics, reducing turbulence and impact within the impeller 1, thereby improving overall operational stability. Understandably, the center of the central disk 30 is the center of the impeller 1, and the inlet angle θ is the angle between the tangent of blade 10 and the circumferential tangent of the impeller 1 at the inlet side edge 110. Figure 2The circumferential tangent of impeller 1 can be defined as a tangent line on the circumference formed from the center of impeller 1 to the air inlet side edge 110, passing through the air inlet side edge 110.

[0053] According to another aspect of this utility model, a range hood is provided. The range hood may include a volute and an impeller 1 as described above. The impeller 1 can be disposed within the volute. Specifically, the volute may include a surrounding plate and a side plate, which can be closed to form a receiving cavity, within which the impeller 1 can be disposed. An air inlet may be provided in the middle of the side plate. The air inlet communicates with an air outlet through the receiving cavity. A volute tongue is provided at the air outlet. The volute tongue facilitates connection to an external exhaust pipe. Since the impeller 1 described above has the aforementioned beneficial effects, the range hood including the impeller 1 also has the aforementioned beneficial effects, which will not be elaborated further here.

[0054] In the description of this utility model, it should be understood that the directional terms such as "front", "rear", "up", "down", "left", "right", "horizontal", "vertical", "horizontal", "top", and "bottom" indicate the orientation or positional relationship, which are usually based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0055] For ease of description, relative terms such as "above," "over," "on the upper surface of," and "above" are used here to describe the regional positional relationship of one or more components or features shown in the figures to other components or features. It should be understood that relative terms include not only the orientation of the component as depicted in the figure but also different orientations during use or operation. For example, if the components in the figures are inverted as a whole, "above" or "above other components or features" will include cases where the component is "below" or "under" other components or features. Thus, the exemplary term "above" can include both "above" and "below." Furthermore, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this document intends to include all such cases.

[0056] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, parts, components, and / or combinations thereof.

[0057] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0058] This utility model has been described through the above embodiments. However, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit the utility model to the described embodiments. Furthermore, those skilled in the art will understand that this utility model is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of this utility model, all of which fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A vane, characterized in that The air inlet side edge and the air outlet side edge are sequentially provided with a first air inlet edge, a second air inlet edge and a third air inlet edge in the length direction, and the air outlet side edge is sequentially provided with a first air outlet edge, a second air outlet edge and a third air outlet edge, the length of the second air outlet edge is less than the length of the second air inlet edge, and the first air inlet edge and the third air inlet edge are both formed with a plurality of tooth-shaped structures, and the first air outlet edge and the third air outlet edge are both formed with a wave-shaped structure.

2. The blade of claim 1, wherein The blade has a length H, the second air inlet edge has a length H1, and H1≤H / 5.

3. The blade of claim 1, wherein The blade has a length H, the second air outlet edge has a length H2, and H2≤H / 6.

4. The blade of claim 1, wherein The first air outlet edge has a length H3, the third air outlet edge has a length H4, and H3 / H4 is 1-3.

5. The blade of claim 1, wherein The first air inlet edge has a length H5, the third air inlet edge has a length H6, and H5 / H6 is 1-3.

6. The blade of claim 1, wherein The blade has a thickness T, the wave-shaped structure has a wavelength T1, and T1 / T is 3-15.

7. The blade of claim 1, wherein The blade has a thickness T, the wave-shaped structure has an amplitude T2, and T2 / T is 15-25.

8. The blade of claim 1, wherein The blade has a thickness T, the tooth-shaped structure has a height T3, and T3 / T is 4-10.

9. The blade of claim 8, wherein, In the length direction, the plurality of tooth-shaped structures on the first air inlet edge are sequentially connected, and the plurality of tooth-shaped structures on the third air inlet edge are sequentially connected.

10. The blade of claim 9, wherein, The tooth-shaped structure has a width T4, and adjacent two tooth-shaped structures have a center distance T5, and T3=T4=T5.

11. The blade of claim 1, wherein The blade includes a first section, a second section and a third section, the first section, the second section and the third section are sequentially connected in the length direction, one end of the first section away from the second section has a spread width K1, one end of the third section away from the second section has a spread width K3, and K1=K3.

12. The blade of claim 11, wherein, The second section has a spread width K2, and K2 / K1=K2 / K3=k, and the k is 0.7-0.

9.

13. An impeller, characterized by It comprises an upper disc, a middle disc, a lower disc and a plurality of blades as claimed in any one of claims 1-12, a plurality of the blades are circumferentially spaced apart along the middle disc, each of the blades is arranged through the middle disc and connected with the upper disc and the lower disc at both ends, an air flow channel is formed between adjacent two blades, the air flow channel forms an air inlet on the side of the air inlet side edge and an air outlet on the side of the air outlet side edge.

14. The impeller of claim 13, wherein The cross section of the blade is arc-shaped, a first line is defined between the center of the circle to which the blade is opposite and the center of the middle disc, a second line is defined between the air inlet side edge and the center of the middle disc, an included angle r is formed between the first line and the second line, the blade has an inlet angle θ at the air inlet side edge, and (4-12)r=θ.

15. A range hood characterized by It comprises a volute and an impeller as claimed in any one of claims 13-14, and the impeller is arranged in the volute.

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