Impeller assembly, fan and range hood
Through the removable connected flow shield design, the cumbersome replacement problem caused by the integrated molding of the flow shield and the chassis in the impeller assembly is solved, and the simplicity of impeller replacement and the flow diversion effect are improved, reducing aerodynamic noise and maintenance difficulties.
Patent Information
- Application Number
- CN202422246578.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-12
AI Technical Summary
In existing impeller components, the flow shield is usually formed integrally with the chassis, which causes the chassis to be reprocessed when replacing the impeller, which is cumbersome and inconvenient for cleaning and maintenance.
Designed with removable connected flow shields, adapted to different impeller forms, independently replaced or cleaned and repaired, the flow shield part is located in the impeller cavity to reduce eddy current and noise.
It simplifies the impeller replacement process, improves the diversion effect, reduces aerodynamic noise, and facilitates the cleaning and maintenance of the diversion cover.
Smart Images
Figure CN223075833U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of kitchen utensils, and particularly to 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. Range hoods can quickly extract the oil fume generated during the user's cooking process, reduce pollution, purify the air, and greatly improve people's quality of life. A fan is usually provided inside the range hood, and the fan usually includes an impeller assembly. The impeller assembly may include an impeller and a driving member, and the output shaft of the driving member may be connected to the impeller, so that the driving member can drive the impeller to rotate. When the impeller rotates, a negative pressure suction force can be generated inside the fan, so that the range hood can achieve the function of sucking oil fume through the fan.
[0003] In the existing impeller assembly, a flow guide cover is usually provided to reduce the eddy current and turbulent flow generated when the impeller rotates, so as to reduce the aerodynamic noise generated by the rotation of the impeller. However, in the existing impeller assembly, the flow guide cover is usually formed by pressing the bottom plate of the impeller. In this way, when replacing the impeller, it is necessary to reprocess the bottom plate of the impeller to form the flow guide cover, which is very troublesome. Summary of the Utility Model
[0004] In order to at least partially solve the problems existing in the prior art, according to one aspect of the present utility model, an impeller assembly is provided. The impeller assembly includes an impeller, a flow guide cover and a driving member. The impeller includes a bottom plate and a plurality of blades. The plurality of blades are arranged in a ring to form a blade ring, and the blade ring is connected to the bottom plate. The driving member has an output shaft, and the bottom plate is vertically connected to the output shaft. The blade ring takes the output shaft as the central axis, and a cavity is formed by enclosing the blade ring and the bottom plate. The flow guide cover is detachably connected to the bottom plate, and at least part of the flow guide cover is located inside the cavity.
[0005] In the impeller assembly provided by the present utility model, since the flow guide cover is detachably connected to the bottom plate, the flow guide cover can be adapted to various forms of impellers, and different flow guide covers can also be assembled on the impeller according to needs. Such a flow guide cover can be produced as a standard part without the need for processing and forming for each impeller. When replacing the impeller according to needs, the flow guide cover can be disassembled and the impeller can be directly replaced alone, without the need for additional processing of the bottom plate of the impeller to form the flow guide cover. Moreover, when it is necessary to clean or repair the inside of the impeller, the connection between the flow guide cover and the bottom plate can be disassembled, so that it is more convenient to clean or repair the inside of the impeller. Since the flow guide cover can be independently taken out from the impeller, the cleaning, repair or replacement of the flow guide cover can also be simpler and more convenient.
[0006] Exemplarily, the impeller has an impeller height L1, the fairing has a fairing height L2, and the impeller height L1 and the fairing height L2 satisfy L2 ≤ L1 + 20 mm. When the fairing height L2 and the impeller height L1 satisfy L2 ≤ L1 + 20 mm, this can reduce the interference between the fairing and external factors, and this can also reduce the blockage of the fairing to the external air flow entering the internal cavity of the impeller.
[0007] Exemplarily, the fairing includes a top wall and an annular side wall. In the height direction, one side of the annular side wall is connected to the top wall, and the other side is detachably connected to the chassis. Both the top wall and the annular side wall are centered on the output shaft. When both the top wall and the annular side wall of the fairing are centered on the output shaft, such a fairing can be more regular, and the guiding effect on the air flow in all directions and regions in the cavity can be better, so that in such an impeller assembly, the aerodynamic noise during the rotation of the impeller can be smaller.
[0008] Exemplarily, in a plane perpendicular to the output shaft, the impeller has an impeller diameter D1, the diameter of the top wall is D2, and the impeller diameter D1 and the diameter D2 of the top wall satisfy D2 ≤ 0.3D1. When D2 ≤ 0.3D1, it is possible to avoid the interference of the fairing to the external air flow entering the internal cavity of the impeller.
[0009] Exemplarily, the annular side wall is inclined to the output shaft and has an inclination angle A2. The blade ring has an inner ring. At the intersection of the inner ring and the blade, there is a tangent line P-P, and at the intersection of the blade and the inner ring, there is a normal line M-M. The blade has an inlet line L-L perpendicular to the normal line M-M. An impeller inlet angle A1 is formed between the tangent line P-P and the inlet line L-L. The inclination angle A2 is not greater than the impeller inlet angle A1. When the inclination angle is not greater than the impeller inlet angle, it can ensure that such a fairing matches the impeller, so that after the fairing is detachably connected to the chassis, the fairing can effectively reduce the aerodynamic noise when the impeller rotates.
[0010] Exemplarily, a flange parallel to the chassis extends outward on the side of the annular side wall close to the chassis, and the flange is threadedly connected to the chassis. By providing a flange on the annular side wall and connecting the flange to the chassis in a threaded connection form, the overall structure is simpler and easier to implement. Moreover, by realizing the detachable connection of the fairing to the chassis in such a form, the connection and disassembly between the fairing and the chassis can be simpler and more convenient, so that it is easier to disassemble, replace, repair or clean the fairing.
[0011] Exemplarily, a through hole is provided in the middle of the chassis. A receiving cavity is formed by enclosing between the top wall, the annular side wall and the chassis. The output shaft passes through the through hole, and at least part of the output shaft is located in the receiving cavity. In this way, the connection of the output shaft to the chassis can be more stable, and the output shaft can drive the impeller to rotate more stably, so that the overall stability of the impeller assembly can be better.
[0012] Exemplarily, a shaft sleeve connecting the output shaft is disposed in the through hole. It is very simple and convenient to connect the chassis to the output shaft of the driving member through the shaft sleeve, so that the connection between the chassis and the output shaft can be simpler, and the overall structure of the impeller assembly can be simpler and easier to implement.
[0013] According to another aspect of the present invention, a blower is provided. The blower includes a volute and any one of the impeller assemblies as described above, the impeller is disposed inside the volute, and the driving member is connected to the volute.
[0014] According to still another aspect of the present invention, a range hood is provided. The range hood includes a box body and the blower as described above, and the blower is disposed inside the box body.
[0015] 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.
[0016] 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
[0017] The following drawings of the present invention are part of the present invention for understanding the present invention. The embodiments and descriptions of the present invention shown in the drawings are used to explain the principles of the present invention. In the drawings,
[0018] Figure 1 is a perspective view of an impeller according to an exemplary embodiment of the present invention;
[0019] Figure 2 is a cross-sectional view of an impeller according to an exemplary embodiment of the present invention;
[0020] Figure 3 is Figure 2 an exploded view of the impeller shown;
[0021] Figure 4 is a cross-sectional view of an impeller according to an exemplary embodiment of the present invention; and
[0022] Figure 5 is a front view of a partial structure of an impeller according to an exemplary embodiment of the present invention.
[0023] Wherein, the above-mentioned drawings include the following reference numerals:
[0024] 11. Impeller; 100. Blade; 200. Chassis; 210. Through hole; 300. Deflector; 310. Top wall; 320. Annular side wall; 321. Flange; 400. Sleeve; 500. Top plate. Detailed implementation manner
[0025] 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 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.
[0026] According to one aspect of the present utility model, an impeller assembly is provided. The impeller assembly may include an impeller and a driving member connected to each other. The impeller assembly can be applied to any suitable device, including but not limited to a blower. Therefore, according to another aspect of the present utility model, a blower is provided. The blower may include a volute and any one of the impeller assemblies described below. The impeller may be disposed inside the volute, and the driving member may 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 still another aspect of the present utility model, a fume extractor is provided. The fume extractor may include a box body and a blower, and the blower may be disposed inside the box body.
[0027] See Figure 1 、 Figure 2 and Figure 3 , the impeller assembly may include an impeller 11, a deflector 300, and a driving member (not shown in the figure). The impeller 11 may include a chassis 200 and a plurality of blades 100. The plurality of blades 100 may be arranged in a ring to form a blade ring, and the blade ring may be connected to the chassis 200 to form the impeller 11. The driving member may have an output shaft. The chassis 200 may be vertically connected to the output shaft. The blade ring may have the output shaft as the central axis, and as shown in the figure, the axis C-C represents the axis of the output shaft. The impeller 11 may include a top plate 500 and a chassis 200, and the blades 100 may be disposed between the top plate 500 and the chassis 200. When the output shaft of the driving member in the impeller assembly rotates, it can drive the 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. 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 from the channels formed between adjacent blades 100 among the plurality of blades 100 to the outside of the impeller 11. When the air flow flows in the channels, it can flow from the inside of the impeller 11 towards the outside of the impeller 11.
[0028] The blade ring and the chassis 200 can enclose to form a cavity. The fairing 300 can be detachably connected to the chassis, and at least part of the fairing 300 can be located inside the cavity. The fairing 300 can be detachably connected to the chassis 200 by snap connection, threaded connection or any other suitable form. The fairing 300 can be entirely located inside the cavity or partially extend outside the cavity, which will be described in detail in combination with specific embodiments below. When the impeller 11 rotates and drives the external gas to form an air flow into the cavity inside the impeller 11, the air flow velocity in the middle region of the cavity is small, while the air flow velocity near the blade 100 is large. Turbulence is likely to occur under such a velocity difference. Since the fairing 300 is provided and at least part of the fairing 300 is located inside the cavity, the air flow entering the cavity will enter the area between the plurality of blades 100 and the fairing 300. Therefore, the setting of the fairing 300 can reduce the size of the area with a velocity difference. Therefore, the setting of the fairing 300 can make the air flow inside the impeller 11 generate less turbulence, and the pneumatic noise generated by the air flow inside the impeller 11 is also less. Moreover, the fairing 300 is detachably connected to the chassis 200, and fairings 300 of different sizes and shapes can be replaced according to needs. The fairing 300 detachably connected to the chassis 200 is also easier to disassemble, replace, repair or clean.
[0029] In the impeller assembly provided by the present utility model, since the fairing 300 is detachably connected to the chassis 200, the fairing 300 can be adapted to various forms of impellers 11, and different fairings 300 can also be assembled to the impeller 11 according to requirements. Such fairings 300 can be produced as standard parts without the need for machining for each impeller 11. When the impeller 11 is replaced according to requirements, the fairing 300 can be disassembled and the impeller 11 can be directly replaced alone without the need for additional machining of the chassis of the impeller 11 to form the fairing 300. Moreover, when it is necessary to clean or repair the inside of the impeller 11, the connection between the fairing 300 and the chassis 200 can be disassembled, so that it is more convenient to clean or repair the inside of the impeller 11. Since the fairing 300 can be independently taken out of the impeller 11, the cleaning, repair or replacement of the fairing 300 can also be simpler and more convenient.
[0030] In an embodiment of the present utility model, the impeller assembly may have an impeller height L1 in the height direction (illustrated direction X-X) of the impeller 11, the flow guide cover 300 may have a flow guide cover height L2 in the height direction X-X, and the height direction X-X may be the length direction of the blades 100 in the impeller 11. The impeller height L1 and the flow guide cover height L2 may satisfy L2 ≤ L1 + 20 mm. The height direction X-X may be parallel to the output shaft. When the flow guide cover height L2 is greater than the impeller height L1 and the difference between the flow guide cover height L2 and the impeller height L1 is greater than 20 mm, the size of the part of the flow guide cover 300 extending out of the cavity is too large, which is likely to interfere with external factors. Moreover, the overall impeller 11 will have too large a size in the height direction X-X and occupy too much space. When the flow guide cover height L2 and the impeller height L1 satisfy L2 ≤ L1 + 20 mm, this can reduce the interference between the flow guide cover 300 and external factors, and this can also reduce the blockage of the flow guide cover 300 to the external air flow entering the internal cavity of the impeller 11.
[0031] In an embodiment of the present utility model, referring to Figure 1 , Figure 2 and Figure 3 , the flow guide cover 300 may include a top wall 310 and an annular side wall 320. In the height direction X-X, one side of the annular side wall 320 may be connected to the top wall 310, and the other side may be detachably connected to the chassis 200. The top wall 310 and the annular side wall 320 may both be centered on the output shaft. The annular side wall 320 may be integrally formed with the top wall 310, or may be separately processed from the top wall 310 and then connected together by welding, clamping or any other form. The annular side wall 320 may be connected to the chassis 200 by clamping, threaded connection or any other form, and the flow guide cover 300 may be detachably connected to the chassis 200 through the detachable connection of the annular side wall 320 to the chassis 200. When the top wall 310 and the annular side wall 320 of the flow guide cover 300 are both centered on the output shaft, such a flow guide cover 300 may be more regular, and the guiding effect on the air flow in various directions and regions in the cavity may be better, so that the pneumatic noise during the rotation of the impeller 11 in such an impeller assembly may be smaller.
[0032] Exemplarily, on a plane perpendicular to the output shaft, 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 may satisfy D2 ≤ 0.3D1. When the diameter D2 of the top wall 310 of the fairing 300 is too large, it may interfere with the entry of external air flow into the internal cavity of the impeller 11. When D2 ≤ 0.3D1, the interference of the fairing 300 with the entry of external air flow into the internal cavity of the impeller 11 can be avoided. Additionally, when D2 ≤ 0.3D1, the top wall 310 may be located within the cavity inside the impeller 11, and at this time, the height L2 of the fairing may not be greater than the height L1 of the impeller. In an embodiment of the present invention, referring to Figure 1 、 Figure 2 and Figure 3 , the height L2 of the fairing may not be greater than the height L1 of the impeller. At this time, the top wall 310 may be located within the cavity inside the impeller 11, and the fairing 300 may be entirely located within the internal cavity of the impeller 11, thereby avoiding the fairing 300 from interfering with the entry of external air flow into the internal cavity of the impeller 11 and also avoiding interference between the fairing 300 and external factors.
[0033] Exemplarily, the height L2 of the fairing may not be less than the height L1 of the impeller, so that a part of the fairing 300 extends out of the cavity. Among them, the top wall 310 of the fairing 300 is located outside the cavity. At this time, the diameter D2 of the top wall 310 needs to be smaller to reduce the blockage of the air flow entering the internal cavity of the impeller 11. Exemplarily, the impeller diameter D1 and the diameter D2 of the top wall 310 may satisfy D2 ≤ 0.2D1. When the diameter D2 of the top wall 310 of the fairing 300 is too large, it may interfere with the entry of external air flow into the internal cavity of the impeller 11. When D2 ≤ 0.2D1, the interference of the fairing 300 with the entry of external air flow into the internal cavity of the impeller 11 can be avoided. Additionally, when D2 ≤ 0.2D1, the diameter D2 of the top wall 310 is smaller, and such a fairing 300 has relatively little interference with the entry of external air flow into the internal cavity of the impeller 11. Thus, the fairing 300 can partially extend out of the impeller 11. In an embodiment of the present invention, referring to Figure 4 , the height L2 of the fairing may not be less than the height L1 of the impeller, and the height direction X-X may be parallel to the central axis C-C. When the height L2 of the fairing is greater than the height L1 of the impeller, the fairing 300 can partially extend out of the cavity, that is, such a fairing 300 can partially extend out of the impeller 11. When such an impeller 11 rotates and drives external air flow into the internal cavity of the impeller 11, the air flow will be guided by the fairing 300 before entering the cavity. Such a fairing 300 has a better guiding effect on the air flow, and the pneumatic noise generated by the air flow during the rotation of such an impeller 11 is smaller.
[0034] In an embodiment of the present invention, referring to Figure 4and Figure 5 , the annular side wall 320 may be inclined to the output shaft with an inclination angle (illustrated angle A2). The vane ring may have an inner ring, and a tangent (illustrated tangent P-P) may be formed at the intersection of the inner ring and the vane 100. A normal line (illustrated normal line M-M) may be formed at the intersection of the vane 100 and the inner ring. The vane 100 may have an inlet line (illustrated line L-L) perpendicular to the normal line M-M. A vane inlet angle A1 is formed between the tangent P-P and the inlet line L-L, and the inclination angle A2 may not be greater than the vane inlet angle A1. The vane inlet angle A1 is generally within a range defined by a standard. For the impeller 11 with different impeller diameters D1, the vane inlet angle A1 may be different. Similarly, for the impeller 11 with different impeller diameters D1, the required inclination angle A2 of the fairing 300 is different. When the inclination angle A2 is not greater than the vane inlet angle A1, it can ensure that such a fairing 300 matches the impeller 11, so that after the fairing 300 is detachably connected to the chassis 200, the fairing 300 can effectively reduce the aerodynamic noise when the impeller 11 rotates.
[0035] In an embodiment of the present utility model, refer to Figure 1 、 Figure 2 and Figure 3 , one end of the annular side wall 320 close to the chassis 200 may extend outward to be provided with a flange 321 parallel to the chassis 200, and the flange 321 may be threadedly connected to the chassis 200. By providing the flange 321 on the annular side wall 320 and connecting the flange 321 to the chassis 200 in a threaded connection form, the overall structure is simpler and easier to implement. Moreover, by such a form, the fairing 300 is detachably connected to the chassis 200, and the connection and disconnection between the fairing 300 and the chassis 200 can be simpler and more convenient, so that it is easier to disassemble, replace, repair or clean the fairing 300.
[0036] In an embodiment of the present utility model, refer to Figure 3, a through hole 210 may be provided in the middle of the chassis 200. An accommodating cavity may be formed by enclosing between the top wall 310, the annular side wall 320 and the chassis 200. The output shaft may pass through the through hole 210, and at least a part of the output shaft may be located in the accommodating cavity. The main body part of the output shaft connected to the driving member may be located outside the accommodating cavity. For example, the main body part of the driving member may be located outside the chassis 200, and the output shaft may pass through the through hole 210 and at least partially extend into the accommodating cavity. By connecting the output shaft to the through hole 210, the output shaft may be connected to the chassis 200. When the output shaft passes through the through hole 210, the contact area between the output shaft and the through hole 210 is the largest, and the connection between the output shaft and the through hole 210 is more stable. Moreover, since at least a part of the output shaft is located in the accommodating cavity, a connecting member may be provided at the through hole 210 and / or in the accommodating cavity to further fix the output shaft. For example, a flange may protrude toward the inside of the accommodating cavity at the edge of the through hole 210, and the part of the output shaft extending into the accommodating cavity may be in contact connection with the flange, so as to further improve the stability of the connection between the output shaft and the chassis 200. That is to say, the connection between the output shaft and the chassis 200 can be more stable in this way, and the output shaft can drive the impeller 11 to rotate more stably when driving the impeller 11, so that the overall stability of the impeller assembly can be better.
[0037] Exemplarily, a shaft sleeve 400 connecting the output shaft may be disposed in the through hole 210. Since the through hole 210 is provided on the chassis 200, the shaft sleeve 400 may be riveted to the chassis 200 by a solid rivet. The shaft sleeve 400 may also be connected to the through hole 210 on the chassis 200 in any other suitable form. The connection between the chassis 200 and the output shaft of the driving member through the shaft sleeve 400 is very simple and convenient, so that the connection between the chassis 200 and the output shaft can be simpler, and the overall structure of the impeller assembly can be simpler and easier to implement.
[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front", "rear", "upper", "lower", "left", "right", "lateral", "vertical", "perpendicular", "horizontal" and "top", "bottom", etc. is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words 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, and therefore cannot be understood as a limitation on the protection scope of the present invention; the orientation words "inside" and "outside" refer to the inside and outside relative to the contour of each component itself.
[0039] For ease of description, regional relative terms such as "above", "over", "on the upper surface", "upper", etc. can be used here to describe the regional positional relationship between one or more components or features shown in the figure and other components or features. It should be understood that regional relative terms not only include the orientation of the components described in the figure but also different orientations during use or operation. For example, if the components in the attached figure 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.
[0040] 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.
[0041] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned attached figures are used to distinguish similar objects and do not necessarily 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.
[0042] The present utility model has been illustrated by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and illustration and are not intended to limit the present utility model within 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 all these variations and modifications 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. An impeller assembly, characterized in that, It includes an impeller, a guide cover and a driving member. The impeller includes a chassis and a plurality of blades. The plurality of blades are arranged in a ring to form a blade ring, and the blade ring is connected to the chassis. The driving member has an output shaft, and the chassis is vertically connected to the output shaft. The blade ring takes the output shaft as the central axis. A cavity is formed by enclosing the blade ring and the chassis. The guide cover is detachably connected to the chassis, and at least part of the guide cover is located inside the cavity.
2. The impeller assembly according to claim 1, wherein, The impeller has an impeller height L1, and the guide cover has a guide cover height L2. The impeller height L1 and the guide cover height L2 satisfy L2 ≤ L1 + 20 mm.
3. The impeller assembly according to claim 1 or 2, wherein The guide cover includes a top wall and an annular side wall. One side of the annular side wall is connected to the top wall, and the other side is detachably connected to the chassis. Both the top wall and the annular side wall take the output shaft as the central axis.
4. The impeller assembly according to claim 3, characterized in that, 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.
5. The impeller assembly according to claim 3, characterized in that, The annular side wall is inclined to the output shaft and has an inclination angle A2. The blade ring has an inner ring. At the intersection of the inner ring and the blade, there is a tangent line P-P. At the intersection of the blade and the inner ring, there is a normal line M-M. The blade has an inlet line L-L perpendicular to the normal line M-M. An impeller inlet angle A1 is formed between the tangent line P-P and the inlet line L-L. The inclination angle A2 is not greater than the impeller inlet angle A1.
6. The impeller assembly according to claim 3, characterized in that On the side of the annular side wall close to the chassis, a flanging parallel to the chassis extends outward, and the flanging is threadedly connected to the chassis.
7. The impeller assembly according to claim 3, characterized in that, A through hole is provided in the middle of the chassis. An accommodating cavity is formed by enclosing the top wall, the annular side wall and the chassis. The output shaft passes through the through hole, and at least part of the output shaft is located inside the accommodating cavity.
8. The impeller assembly according to claim 7, wherein, A shaft sleeve connecting the output shaft is inserted in the through hole.
9. A blower, characterized in that, It includes a volute and an impeller assembly as described in any one of claims 1-8. The impeller is arranged inside the volute, and the driving member is connected to the volute.
10. A range hood, characterized in that, It includes a box body and a blower as described in claim 9. The blower is arranged inside the box body.