Fan assembly and range hood with same

Abstract

The draught fan assembly comprises a volute and an impeller, the volute comprises a volute body and an air outlet, the volute body comprises a side plate, the side plate is provided with an inclined face, the inclined face is formed by bending the side plate from the bending position of the bottom of the side plate to the interior of the volute body, and the impeller is arranged in the volute body. A guide block and an oil dripping hole are arranged on the inner side of the bottom of the volute body, the guide block is provided with a first windward face, a second windward face and a flow guide face, a first protrusion is arranged on the edge, away from the second windward face, of the first windward face, and a second protrusion is formed at the joint of the second windward face and the flow guide face. The bottom of the volute is designed to be the inclined face, compactness of the fan is achieved, the guide block is arranged in the volute, the strength of the volute and the oil stain collecting efficiency can be improved, the flow guide face of the guide block can effectively adsorb flowing substances, stability of overall airflow is ensured, and flowing loss is avoided.

Description

Technical Field

[0001] The present disclosure relates to the technical field of thin fans, and in particular to a fan assembly and a range hood having the same. Background Art

[0002] In thin fans, since the thickness of the volute is limited, in order to maintain enough space to accommodate the impeller, the diameter of the impeller needs to be enlarged. However, due to the limited diameter of the volute, in order to accommodate the enlargement of the impeller, the volute needs to be partially specially designed.

[0003] A common design method is to cut off a part of the volute horizontally at the bottom of the volute to create a larger space to accommodate the impeller. However, this method may affect the strength of the volute, destroy the volute profile, and lead to uneven flow field and flow loss. In addition, because the volute is cut, the airflow will accelerate through the cut part, resulting in the oil pollution not being discharged through the drip hole in time, but being discharged directly into the building pipes, resulting in low oil pollution collection efficiency, thereby increasing the pressure on municipal environmental protection. Utility Model Content

[0004] In order to solve the technical problems that the volute profile is damaged in the above-mentioned thin fan, resulting in flow loss and low oil collection efficiency, the utility model proposes a fan assembly.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A fan assembly, comprising:

[0007] A volute, the volute comprising a volute body and an air outlet, the air outlet being located at any end of the top of the volute body, a volute tongue being provided between the air outlet and the volute body, the volute tongue being located at an end of the volute body opposite to the air outlet;

[0008] The volute body includes a side plate, an air inlet is provided on the side plate, and the side plate has an inclined surface, the inclined surface is formed by bending the side plate from the bending position at the bottom toward the inside of the volute body, and the side plate is located on any side of the volute body;

[0009] A guide block and an oil dripping hole are arranged on the inner side of the bottom of the volute body, the guide block has a first windward surface, a second windward surface and a flow guide surface which are connected in sequence, a first protrusion is arranged on the edge of the first windward surface away from the second windward surface, the first protrusion is located upstream in the direction of airflow, a second protrusion is formed at the connection between the second windward surface and the flow guide surface, and the oil dripping hole is arranged near the second protrusion;

[0010] An impeller is installed inside the volute body, and an air duct is formed between the impeller and the volute body.

[0011] In a further embodiment, the width of the air duct gradually increases from an end where the volute body is connected to the volute tongue to an end away from the volute tongue.

[0012] In a further embodiment, a plurality of small holes are provided on the volute tongue, and the small holes are used to measure the pressure pulsation at the volute tongue.

[0013] In a further embodiment, a first angle is formed between the first windward surface and the direction of airflow, and the angle range of the first angle is between 12 degrees and 30 degrees. A second angle is formed between the second windward surface and the direction of airflow, and the second angle is greater than the first angle and less than 90 degrees. A third angle is formed between the second windward surface and the guide surface, and the angle range of the third angle is between 120 degrees and 135 degrees.

[0014] In a further embodiment, the radial distance between the impeller and the volute body is greater than the axial distance, and the radial distance is less than 1.5 times the axial distance, the axial distance is the distance from the bottom of the impeller to the bending position, and the radial distance is the distance from the edge of the impeller to the volute body in the horizontal direction, the edge is adjacent to the end where the volute body is connected to the volute tongue.

[0015] In a further embodiment, the fan assembly further includes an oil collecting device, which is located at the bottom of the oil dripping hole and is used to collect oil stains.

[0016] In a further embodiment, an angle is formed between the inclined surface and the side panel, and a size of the angle is between 100 degrees and 120 degrees.

[0017] In a further embodiment, the diameter of the oil drip hole is between 2 mm and 5 mm.

[0018] In a further embodiment, the fan assembly further includes a motor, which is installed between the volute body and the impeller and is used to drive the impeller to rotate.

[0019] The utility model also provides a range hood, which comprises the above-mentioned fan assembly.

[0020] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0021] The implementation of this disclosure has the following beneficial effects:

[0022] The utility model realizes the compactness of the fan by designing the bottom of the volute into an inclined surface, and a guide block and an oil dripping hole are arranged on the inner side of the bottom of the volute. The guide block can improve the strength of the volute on the one hand, and can separate the airflow by using the guide block on the other hand, and a layout positive pressure is generated at the guide block, so that the oil in the airflow falls off with the vortex and is quickly discharged into the oil dripping hole, which improves the efficiency of oil collection and also eliminates the need for connecting pipes and other components, simplifying the internal structure of the volute. In addition, through the design of the guide block, the flowing material can be adhered to the guide surface of the guide block, thereby prompting the airflow to adhere to the guide surface again, thereby maintaining the stability of the overall airflow, avoiding the oil from running around in the airflow, reducing flow loss and flow resistance, and improving the efficiency of the fan.

[0023] Further features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions and advantages in the embodiments of this specification or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 An assembly diagram of a fan assembly according to an embodiment of the present disclosure is shown;

[0026] Figure 2 A schematic structural diagram of a volute according to an embodiment of the present disclosure is shown;

[0027] Figure 3 An exploded view of a volute according to an embodiment of the present disclosure is shown;

[0028] Figure 4 A detailed schematic diagram of a guide block according to an embodiment of the present disclosure is shown.

[0029] In the figure: 1. volute; 11. volute body; 12. air outlet; 13. volute tongue; 2. side plate; 21. inclined surface; 211. bending position; 3. guide block; 31. first windward surface; 311. first protrusion; 32. second windward surface; 321. second protrusion; 33. guide surface; 4. oil drip hole; 5. impeller. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of this specification to clearly and completely describe the technical solutions in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0032] Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0033] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0034] The term "and / or" herein is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" herein represents any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C can represent including any one or more elements selected from the set consisting of A, B, and C.

[0035] In addition, in order to better illustrate the present disclosure, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present disclosure can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present disclosure.

[0036] Figure 1The assembly diagram of the fan assembly according to the embodiment of the present disclosure is shown as follows: Figure 1 As shown, in one embodiment of the utility model, a fan assembly is involved, including

[0037] A volute 1, the volute 1 comprising a volute body 11 and an air outlet 12, the air outlet 12 being located at either end of the top of the volute body 11, a volute tongue 13 being provided between the air outlet 12 and the volute body 11, the volute tongue 13 being located at an end of the volute body 11 opposite to the air outlet 12;

[0038] In this embodiment, the volute body 11 is made of galvanized sheet, which can provide good corrosion resistance and mechanical strength. In order to further optimize the performance of the volute 1, the inner surface of the volute body 11 can be coated to reduce friction loss and increase the fluidity of the airflow. In more embodiments, the volute body 11 can also be made of metal materials such as cast iron, aluminum alloy, or plastic to ensure the strength, heat resistance and corrosion resistance of the volute body 11. The shape of the volute body 11 is usually cylindrical, but it can also be designed into other shapes such as square or rectangular according to application requirements and space limitations. The volute body 11 in this embodiment is designed as a cylindrical shape as a whole. The air outlet 12 can be connected to the volute body 11 by welding, bolting or other appropriate methods. The size of the air outlet 12 usually needs to match the size of the specific fan outlet and ensure sufficient air flow. The volute tongue 13 can be connected to the volute body 11 by welding or bolting. By adjusting the shape and angle of the volute tongue 13, it can help improve the efficiency and performance of the fan, so that the airflow can pass through the volute 1 more smoothly.

[0039] Figure 2 and Figure 3 The structural schematic diagram and the exploded diagram of the volute according to the embodiment of the present disclosure are respectively shown as follows: Figure 2 and Figure 3 As shown, the volute body 11 includes a side plate 2, an air inlet is opened on the side plate 2, and the side plate 2 has an inclined surface 21, and the inclined surface 21 is formed by bending the side plate 2 from the bending position 211 at the bottom toward the inside of the volute body 11, and the side plate 2 is located on any side of the volute body 11;

[0040] The air inlet in this embodiment is opened at the central position of the side plate 2, which is used to introduce airflow and guide the airflow to the impeller. In other embodiments, the air inlet can also be opened on one side of the side plate 2 according to design requirements and airflow direction, and the disclosed embodiment is not limited to this. In addition, an air inlet ring is also provided in this embodiment, and the air inlet ring is arranged around the outer ring of the air inlet to further guide and control the airflow entering the volute 1. The air inlet ring can help optimize the entry direction and flow characteristics of the airflow.

[0041] The inner side of the bottom of the volute body 11 is provided with a guide block 3 and an oil drip hole 4. Figure 4 , which shows a detailed schematic diagram of the guide block 3 according to an embodiment of the present disclosure, such as Figure 4 As shown, the guide block 3 has a first windward surface 31, a second windward surface 32 and a guide surface 33 connected in sequence, a first protrusion 311 is provided at an edge of the first windward surface 31 away from the second windward surface 32, the first protrusion 311 is located upstream in the direction of airflow, a second protrusion 321 is formed at the connection between the second windward surface 32 and the guide surface 33, and the oil dripping hole 4 is provided near the second protrusion 321;

[0042] For example, in this embodiment, the airflow flows in the volute body 11 in a clockwise direction. When the airflow passes through the guide block 3, it is intercepted by the first windward surface 31. The first protrusion 311 forces the airflow to separate into free streamlines and turbulent vortices. The turbulent vortex is a violently disturbed flow state that can mix the surrounding materials and bring them into the vortex. Then the mixed free streamlines and turbulent vortices hit the second protrusion 321. The mixed free streamlines and turbulent vortices will further separate to form vortices and free streamlines, and the oil in the airflow will be brought into the vortex. Due to the local sudden change in the airflow velocity, a pressurized flow is formed at the second protrusion 321. The vortex carries the oil into the oil dripping hole 4 near the second protrusion 321. The guide surface 33 can make the flowing material (such as oil droplets) adhere to the guide surface 33, thereby prompting the airflow to adhere to the guide surface 33 again, thereby maintaining the stability of the overall airflow, preventing the oil from running around in the airflow, and reducing the flow loss and flow resistance. The guide surface 33 may be adjusted according to specific applications and requirements. For example, the inclination angle, surface texture and size of the guide surface 33 may be adjusted to achieve better adhesion and flow control effects.

[0043] The shape of the second protrusion 321 can be an obtuse angle or a shape that causes the airflow direction to change, which can cause flow separation and shearing, so that the mixed free streamlines and turbulent vortices are further separated at the second protrusion 321, thereby causing a local mutation in the airflow velocity. In this embodiment, the second protrusion 321 is designed to be an obtuse angle. Preferably, the angle of the second protrusion 321 is between 120° and 135°. In other embodiments, the flow separation and shearing effect can also be achieved by adjusting factors such as the height, angle and shape of the second protrusion 321.

[0044] The impeller 5 is installed inside the volute body 11, and an air duct is formed between the impeller 5 and the volute body 11. The impeller 5 is usually installed inside the volute 1 through a mounting sleeve or a shaft. The impeller 5 can be set at the center position inside the volute 1 so that the airflow is evenly distributed inside the volute 1 and the influence of centrifugal force on the volute 1 is reduced. In other embodiments, the impeller 5 can also be set at a position close to the air inlet, close to the air outlet 12, or at an eccentric position inside the volute 1. In each specific embodiment, the best setting position of the impeller 5 can be determined by numerical simulation, experimental verification, etc. It should be noted that during installation, it is necessary to ensure that there is a suitable gap and connection between the impeller 5 and the volute 1 to ensure that the impeller 5 can rotate smoothly during operation and provide efficient output under the required air flow conditions. In addition, the sealing between the impeller 5 and the volute 1 needs to be considered to prevent air leakage. The air duct is used to guide the air flow to pass through and realize air transportation. In this embodiment, the spiral air duct is adopted, which can better utilize the rotational power of the impeller 5 and make the air flow pass through more smoothly.

[0045] In this embodiment, the width of the air duct gradually increases from the end where the volute body 11 is connected to the volute tongue 13 to the end away from the volute tongue 13. The air duct can be gradually widened by designing the shape of the volute body 11, for example, by adopting a conical or curved volute body 11. When the width of the air duct gradually increases, the volume of the air duct will also gradually increase, which can reduce the resistance of the airflow, improve the airflow flow and transmission efficiency, and the design of gradually increasing width can also help reduce pressure loss. When the airflow passes through the air duct, the gradually increasing width can reduce the flow rate, thereby reducing energy loss and pressure loss, and the appropriate width change design can reduce the turbulence and vortex of the airflow, thereby reducing the possibility of noise and vibration.

[0046] The volute tongue 13 is provided with a plurality of small holes, which are used to measure the pressure pulsation at the volute tongue 13. In this embodiment, the diameter of the small holes is designed to be 1 mm, and the plurality of small holes are evenly distributed on the volute tongue 13, and can be opened according to a certain rule, for example, the small holes can be arranged in a grid shape of a circle, a square or other geometric shapes to ensure uniform coverage of the measurement points. The channel formed by the holes punched at the volute tongue 13 is connected to the pitot tube, which can effectively collect the pressure pulsation signal at the volute tongue 13. When the pressure pulsation occurs at the volute tongue 13, the pulsation signal will be transmitted to the connected pitot tube through the channel. Inside the pitot tube, the pressure pulsation signal will cause the pressure change of the gas, and then generate corresponding electrical signals. By observing and analyzing these signals, the pressure change law and characteristics at the volute tongue 13 can be understood, so as to judge the operating status and performance of the system. On the other hand, the gas pressure in the range hood cavity can be communicated through the small holes connected to the channel at the volute tongue 13. When the pressure pulsation occurs at the volute tongue 13, these signals will not only be transmitted to the pitot tube, but also to the cavity of the range hood. Since the gas pressure in the cavity is relatively stable, it can balance and adjust the pressure pulsation generated at the volute tongue 13, thereby reducing the pressure pulsation amplitude at the volute tongue 13, which can effectively reduce the generation of noise and improve the stability and working efficiency of the system.

[0047] A first angle is formed between the first windward surface 31 and the direction of the airflow, and the angle range of the first angle is between 12 degrees and 30 degrees. If the first angle is too large, the relative speed between the airflow and the first windward surface 31 will increase, resulting in increased wind resistance, energy loss and reduced energy efficiency, increased energy consumption and operating costs; if the first angle is too small, the interception effect will be poor, and pollutants such as particles, eddies and oil stains in the airflow cannot be effectively intercepted and suppressed. A second angle is formed between the second windward surface 32 and the direction of the airflow, and the second angle is greater than the first angle and less than 90 degrees. If the second angle is too large, eddies and oil stains will accumulate here, which will reduce the efficiency of the system, increase energy consumption and maintenance costs, and even increase the risk of failure. Therefore, through appropriate angle design, this embodiment can achieve effective interception of airflow and suppression of pollutants, and improve the performance and efficiency of the system. When determining the specific angle, it can be expanded and optimized according to the design requirements and combined with the actual situation. In addition, it can also be considered to combine other factors, such as material selection, surface treatment, etc., to further optimize the design and achieve better results. A third angle is formed between the second windward surface 32 and the guide surface 33, and the angle range of the third angle is between 120 degrees and 135 degrees, which can change the direction of the airflow, causing flow separation and shearing, so that the mixed free streamlines and turbulent vortices are further separated at the second protrusion 321. In other embodiments, the shape of the second protrusion 321 can be adjusted so that the direction of the airflow can be changed to achieve flow separation and shearing effects.

[0048] The radial distance between the impeller 5 and the volute body 11 is greater than the axial distance, and the radial distance is less than 1.5 times the axial distance, the axial distance is the distance from the bottom of the impeller 5 to the bending position 211, and the radial distance is the distance from the edge of the impeller 5 to the volute body 11 in the horizontal direction, and the edge is close to the end where the volute body 11 is connected to the volute tongue 13. Through such a design, a low noise level can be maintained in a kitchen environment, providing a more comfortable use experience. At the same time, the compact design of the fan also helps to save space and improve the overall efficiency and performance of the equipment.

[0049] For the noise at two moments, when there is no back pressure (maximum air volume), the radial distance is equal to the axial distance or the radial distance is 1.5 times the axial distance, the noise difference is as small as 0.2dB, which has little impact.

[0050] However, for kitchen noise (air volume 12m3 / min), when the radial distance is greater than the axial distance and the radial distance is less than 1.5 times the axial distance, the kitchen noise is lower, and the fan can be made compact without increasing the kitchen noise.

[0051] The fan assembly provided in this embodiment also includes an oil collecting device, which is located at the bottom of the oil dripping hole 4 and is used to collect oil. Common oil collecting devices include oil-water separators, oil recovery barrels, oil collection tanks, etc. The oil collecting device can be fixed under the oil dripping hole 4 and connected thereto to ensure that the seal between the oil collecting device and the oil dripping hole 4 is tight to prevent oil from spilling. The specific installation method can be operated according to the design of the oil collecting device and the manufacturer's instructions to ensure correct installation and normal operation.

[0052] The inclined surface 21 and the side plate 2 form an angle, and the angle is between 100 and 120 degrees. By limiting the angle, the overall size of the fan can be made more compact, the bottom area of ​​the fan can be effectively reduced, the installation space can be saved, the flow of airflow can be improved, and energy loss and pressure loss can be reduced. Smoother airflow helps to improve the operating efficiency and performance of the fan.

[0053] The diameter of the oil drip hole 4 is between 2 mm and 5 mm. Selecting an appropriate diameter of the oil drip hole 4 can reduce the resistance and pressure loss of the oil drip hole 4, which helps to improve the operating efficiency of the fan and avoid blockage caused by too small a diameter and excessive oil discharge caused by too large a diameter.

[0054] The fan assembly also includes a motor, which is installed between the volute body 11 and the impeller 5 to drive the impeller 5 to rotate. Commonly used motors include AC motors and DC motors. The motor is usually tightly connected to the back or bottom of the impeller 5 by bolts or other fixing devices, and is connected to the impeller 5 by the motor shaft, which can ensure a stable installation and transmit the rotational force of the motor. When the motor is started and running, the impeller 5 will rotate, thereby generating air flow. The selection and installation method of the motor will vary according to the specific fan design and application requirements. For example, the power and speed of the motor must match the size and design requirements of the impeller 5. The motor is usually powered by a power supply and is started, stopped and adjusted by an electronic control system, which can achieve efficient and controllable air flow to meet the needs of different application scenarios.

[0055] This embodiment also provides a range hood, which includes the above-mentioned fan assembly.

[0056] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A fan assembly, characterized in that: include: A volute (1), the volute (1) comprising a volute body (11) and an air outlet (12), the air outlet (12) being located at any end of the top of the volute body (11), a volute tongue (13) being provided between the air outlet (12) and the volute body (11), the volute tongue (13) being located at an end of the volute body (11) opposite to the air outlet (12); The volute body (11) comprises a side plate (2), an air inlet is provided on the side plate (2), and the side plate (2) has an inclined surface (21), the inclined surface (21) is formed by bending the side plate (2) from a bending position (211) at the bottom thereof toward the inside of the volute body (11), and the side plate (2) is located on any side of the volute body (11); A guide block (3) and an oil dripping hole (4) are arranged on the inner side of the bottom of the volute body (11); the guide block (3) has a first windward surface (31), a second windward surface (32) and a flow guide surface (33) which are connected in sequence; a first protrusion (311) is arranged on the edge of the first windward surface (31) away from the second windward surface (32); the first protrusion (311) is located upstream in the direction of airflow; a second protrusion (321) is formed at the connection between the second windward surface (32) and the flow guide surface (33); and the oil dripping hole (4) is arranged close to the second protrusion (321); An impeller (5) is installed inside the volute body (11), and an air duct is formed between the impeller (5) and the volute body (11).

2. The fan assembly according to claim 1, characterized in that: The width of the air duct gradually increases from an end where the volute body (11) is connected to the volute tongue (13) to an end away from the volute tongue (13).

3. The fan assembly according to claim 1, characterized in that: The volute tongue (13) is provided with a plurality of small holes, and the small holes are used to measure the pressure pulsation at the volute tongue (13).

4. The fan assembly according to claim 1, characterized in that: A first angle is formed between the first windward surface (31) and the direction of the airflow, and the angle range of the first angle is between 12 degrees and 30 degrees. A second angle is formed between the second windward surface (32) and the direction of the airflow, and the second angle is greater than the first angle and less than 90 degrees. A third angle is formed between the second windward surface (32) and the guide surface (33), and the angle range of the third angle is between 120 degrees and 135 degrees.

5. The fan assembly according to claim 1, characterized in that: The radial distance between the impeller (5) and the volute body (11) is greater than the axial distance, and the radial distance is less than 1.5 times the axial distance, the axial distance is the distance from the bottom of the impeller (5) to the bending position (211), and the radial distance is the distance from the edge of the impeller (5) to the volute body (11) in the horizontal direction, the edge being adjacent to an end where the volute body (11) is connected to the volute tongue (13).

6. The fan assembly according to claim 1, characterized in that: It also comprises an oil collecting device, which is located at the bottom of the oil dripping hole (4) and is used to collect oil stains.

7. The fan assembly according to claim 1, characterized in that: An angle is formed between the inclined surface (21) and the side plate (2), and the size of the angle is between 100 degrees and 120 degrees.

8. The fan assembly according to claim 1, characterized in that: The diameter of the oil dripping hole (4) is between 2 mm and 5 mm.

9. The fan assembly according to claim 1, characterized in that: It also includes a motor, which is installed between the volute body (11) and the impeller (5) and is used to drive the impeller (5) to rotate.

10. A range hood, characterized in that: The range hood comprises the fan assembly according to any one of claims 1 to 9.

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