Patent Publication Number: US-2023144096-A1

Title: Slim range hood

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS 
     The present application claims benefit of Chinese patent application No. 202111315348.6, filed with CNIPA on Nov. 8, 2021, the contents of which are hereby incorporated by reference in its entirety. 
     FIELD 
     The present disclosure relates to the field of range hood technologies, and more particularly, to a slim range hood. 
     BACKGROUND 
     A slim range hood is mainly featured with its slimness and mounting under a cupboard. Due to differentiated user needs, such products have different appearances and different sizes. 
     SUMMARY 
     Embodiments of the present disclosure provide a slim range hood. 
     A slim range hood according to an embodiment of the present disclosure includes: a box body having an internal circulation air outlet; and a fan assembly arranged in the box body and including a volute and an air guide cover. The volute includes an air inlet part and a first air outlet part connected to an air outlet of the air inlet part. The air guide cover is detachably mounted at an air outlet of the first air outlet part and is configured to guide an air flow sucked in by the fan assembly to the internal circulation air outlet. 
     With the slim range hood, a design of matching the volute with different air guide covers is realized by mounting the detachable air guide cover on the first air outlet part, different product structure sizes and air outlets of different sizes are satisfied, and different types of products can have the same core component. Therefore, high standardization is provided, the development investment is low, and the development cycle is short, which are conducive to expansion of product series and iterative upgrade of product performance. 
     Additional embodiments of the present disclosure will be given in part in the following description, or become apparent at least in part from the following description, or can be learned from practicing of the present disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and/or additional embodiments of the present disclosure will become apparent and readily understandable from the following description of embodiments taken in conjunction with the accompanying drawings, in which: 
         FIG.  1    to  FIG.  4    are schematic diagrams showing structures of slim range hoods according to embodiments of the present disclosure; 
         FIG.  5    is a schematic bottom view of a slim range hood according to some embodiments of the present disclosure; 
         FIG.  6    is a schematic diagram showing a partial interior of a slim range hood according to some embodiments of the present disclosure; 
         FIG.  7    is a schematic bottom view of a slim range hood according to some embodiments of the present disclosure; 
         FIG.  8    is a schematic diagram showing a partial interior of a slim range hood according to some embodiments of the present disclosure; 
         FIG.  9    is a schematic bottom view of a slim range hood according to some embodiments of the present disclosure; 
         FIG.  10    is a schematic diagram showing a partial interior of a slim range hood according to some embodiments of the present disclosure; 
         FIG.  11    and  FIG.  12    are schematic cross-sectional views of a slim range hood according to some embodiments of the present disclosure; 
         FIGS.  13  to  15    are each a schematic diagram of an oil fume path of a slim range hood according to some embodiments of the present disclosure; 
         FIG.  16    is a schematic diagram showing a connection between a fan assembly and an air guide cover according to some embodiments of the present disclosure; 
         FIG.  17    and  FIG.  18    are each an exploded schematic diagram of a fan assembly and an air guide cover according to some embodiments of the present disclosure; 
         FIG.  19    is another schematic diagram showing a connection between a fan assembly and an air guide cover according to some embodiments of the present disclosure; 
         FIG.  20    and  FIG.  21    are each another exploded schematic diagram of a fan assembly and an air guide cover according to some embodiments of the present disclosure; 
         FIG.  22    is yet another schematic diagram showing a connection between a fan assembly and an air guide cover according to some embodiments of the present disclosure; 
         FIG.  23    and  FIG.  24    are each yet another exploded schematic diagram of a fan assembly and an air guide cover according to some embodiments of the present disclosure; 
         FIG.  25    is a schematic diagram showing a disconnection between a fan assembly and an air guide cover according to some embodiments of the present disclosure; 
         FIG.  26    is a partially enlarged schematic diagram showing a disconnection between a fan assembly and an air guide cover according to some embodiments of the present disclosure; 
         FIG.  27    is a schematic diagram showing a connection between a fan assembly and an air guide cover according to some embodiments of the present disclosure; 
         FIG.  28    is a partially enlarged schematic diagram showing a connection between a fan assembly and an air guide cover according to some embodiments of the present disclosure; 
         FIG.  29    is a schematic diagram showing a disconnection between a fan assembly and an active filtering assembly according to some embodiments of the present disclosure; 
         FIG.  30    is a schematic cross-sectional view of a fan assembly and an active filtering assembly according to some embodiments of the present disclosure; and 
         FIG.  31    is a schematic diagram showing a structure of an active filtering assembly according to some embodiments of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION OF THE DISCLOSURE 
     The embodiments of the present disclosure will be described in detail below with reference to examples thereof as illustrated in the accompanying drawings, throughout which same or similar elements, or elements having same or similar functions, are denoted by same or similar reference numerals. The embodiments described below with reference to the drawings are illustrative only, and are intended to explain rather than limit the present disclosure. 
     In the description of the present disclosure, it should be understood that the orientation or position relationship indicated by the term “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, or “counterclockwise”, etc. is based on the orientation or position relationship shown in the drawing, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the pointed device or element must have a specific orientation, or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. In the description of the present disclosure, “plurality” means at least two, unless otherwise specifically defined. 
     It should be noted that, in the description of the present disclosure, unless otherwise clearly specified and limited, terms such as “mount”, “connected”, and “connect” should be understood in a broad sense. For example, it may be a fixed connection or a detachable connection or an integral connection; a mechanical connection or electrical connection; a direct connection or an indirect connection through an intermediate; and internal communication of two components or an interaction relationship between two components. The specific meaning of the above-mentioned terms in the present disclosure can be understood according to specific circumstances. 
     In the present disclosure, unless expressly stipulated and defined otherwise, the first feature being “on” or “under” the second feature may include the first feature being in direct contact with the second feature, or the first feature being not in direct contact with the second feature, but being in contact with the second feature through another feature therebetween. In one embodiment, the first feature being “above” the second feature includes the first feature being directly above or obliquely above the second feature, or simply mean that a level of the first feature is higher than a level of the second feature. The first feature being “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply mean that a level of the first feature is lower than a level of the second feature. 
     A variety of different embodiments or examples for implementing different structures of the present disclosure are provided. In order to simplify the disclosure, components and arrangements of specific examples are described herein. Of course, the specific examples are exemplary only and are not intended to limit the present disclosure. Furthermore, reference numerals and/or reference letters may be repeated in different examples of the present disclosure for the purpose of simplicity and clarity, without indicating a relationship between different embodiments and/or arrangements under discussion. 
     Slim range hood products have different appearances and different sizes. As a result, it is necessary to develop, based on appearance and sizes of specific products, air passage assemblies that match structural sizes of the specific products and have relevant performances, to require many different air passage-related fan assembly parts. A large number of parts leads to high investment, various development contents, and low standardization, which are not conducive to expansion of product series and iterative upgrade of product performance. In view of this, the inventors provide the embodiments of the present disclosure, in order to provide a slim range hood with high standardization, small development investment, and short development cycle, facilitating expansion of product series and iterative upgrade of product performance. 
     Referring to  FIG.  1    to  FIG.  16   , a slim range hood  100  according to embodiments of the present disclosure includes a box body  12  and a fan assembly  14 . The box body  12  has an internal circulation air outlet  16 . The fan assembly  14  is arranged in the box body  12  and includes a volute  18  and an air guide cover  20 . The volute  18  includes an air inlet part  22  and a first air outlet part  24  connected to an air outlet  221  of the air inlet part  22 . The air guide cover  20  is detachably mounted at an air outlet of the first air outlet part  24  and is configured to guide an air flow sucked in by the fan assembly  14  to the internal circulation air outlet  16 . 
     With the slim range hood  100 , a design of matching the volute  18  with different air guide covers  20  is realized by mounting the detachable air guide cover  20  on the first air outlet part  24 , different product structure sizes and air outlets of different sizes are satisfied, and different types of products can have the same core component. Therefore, high standardization is provided, the development investment is small, and the development cycle is short, which are conducive to expansion of product series, iterative upgrade of product performance, and company operation. 
     In some embodiments, when the slim range hood  100  is mounted, the fan assembly  14  is arranged horizontally. In this way, an overall thickness of the range hood is small, and an air inlet of the air inlet part  22  is directed downwards to suck air. 
     The box body  12  can serve as a housing of the range hood and may be made of metals, such as stainless steel. In the embodiment illustrated in  FIG.  1   , the box body  12  includes a top plate  26 , a rear plate  28 , a front plate  30 , and side plates  32 . The side plates  32  include a left side plate and a right side plate. The side plates  32  are connected to the front plate  30 , the top plate  26 , and the rear plate  28 , and the top plate  26  is connected to the rear plate  28  and the front plate  30 . The front plate  30  is inclined downwardly from the top plate  26 , and the internal circulation air outlet  16  is provided on the front plate  30 , and the air flow can exit upwardly, to avoid discomfort caused by direct blowing to a user. 
     Referring to  FIG.  1    to  FIG.  5   , the slim range hood  100  illustrated in  FIG.  1    has a small overall structure size (e.g., a small thickness), the internal circulation air outlet  16  is small (e.g., an air outlet region has a small width), and an air outlet of the air guide cover  20  is also relatively small (e.g., a width of the air outlet is small). The slim range hood  100  illustrated in  FIG.  2    has a large overall structure size (e.g., a large thickness), the internal circulation air outlet  16  is large (e.g., an air outlet region has a large width), and the air outlet of the air guide cover  20  is also relatively large (e.g., the width of the air outlet is large). Both the slim range hood  100  illustrated in  FIG.  3    and the slim range hood  100  illustrated in  FIG.  4    have a larger overall structure size (e.g., a larger thickness), the internal circulation air outlet  16  is larger (e.g., the air outlet region has a larger width), and the air outlet of the air guide cover  20  is also larger (e.g., the width of the air outlet is larger). The thickness of the slim range hood  100  illustrated in  FIG.  4    is greater than the thickness of the slim range hood  100  illustrated in  FIG.  3   . 
     In  FIG.  2    and  FIG.  3   , a lower end of the front plate  30  of the slim range hood  100  is connected to an arc-shaped plate  34 . In  FIG.  1    and  FIG.  4   , the lower end of the front plate  30  of the slim range hood  100  is connected to a flat plate  36 . The two have different front side configurations, which can be adapted to more needs. It can be understood that the slim range hood  100  may have other front side configurations in other embodiments. 
     In some embodiments, keys and/or a display screen may be provided on the arc-shaped plate  34  or the flat plate  36  for user operations. The keys may include a knob, a press key, a sliding key, and the like. The display screen can display information such as gears of a fan  40 , frying pan temperature, etc. In addition, the display screen may be a touch display screen that may display virtual keys, and the user may control the operation of the range hood through the virtual keys. 
       FIG.  1   ,  FIG.  5   , and  FIG.  6    illustrate slim range hoods  100  having the same appearance dimension.  FIG.  2   ,  FIG.  7   , and  FIG.  8    illustrate slim range hoods  100  having the same appearance dimension.  FIG.  3   ,  FIG.  9   , and  FIG.  10    illustrate slim range hoods  100  having the same appearance dimension. 
       FIGS.  16  to  24    illustrate air guide covers  20  suitable for different sizes of range hoods. The air guide covers  20  illustrated in  FIGS.  16  to  18    are suitable for the slim range hood  100  illustrated in  FIG.  1   , the air guide covers  20  illustrated in  FIGS.  19  to  21    are suitable for the slim range hood  100  illustrated in  FIG.  2   , and the air guide covers  20  illustrated in  FIG.  22    to  FIG.  24    are suitable for the slim range hoods  100  illustrated in  FIG.  3    and  FIG.  4   . 
     The fan assembly  14  further includes the fan  40  arranged in the air inlet part  22  of the volute  18 . When the fan  40  rotates, the air flow (oil fume) is sucked in from the air inlet of the air inlet part  22 , and can be discharged from the internal circulation air outlet  16  through the first air outlet part  24  and the air guide cover  20 . 
     In some embodiments, the box body  12  has an external circulation air outlet  42 , the volute  18  includes a second air outlet part  44  connected to the air outlet of the air inlet part  22 , and the second air outlet part  44  is configured to guide the air flow sucked in by the fan assembly  14  to the external circulation air outlet  42 . In this case, operation modes of the slim range hood  100  can be increased. 
     In some embodiments, in the embodiments, since the box body  12  has the external circulation air outlet  42  and the internal circulation air outlet  16 , the slim range hood  100  can choose to operate in an external circulation operation mode or an internal circulation operation mode. In the external circulation operation mode, the air flow sucked in by the fan assembly  14  is discharged from the external circulation air outlet  42 . In the internal circulation operation mode, the air flow sucked in by the fan assembly  14  is discharged from the internal circulation air outlet  16 . 
     It can be understood that, in other embodiments, the slim range hood  100  can choose to operate under both the external circulation operation mode and the internal circulation operation mode 
     In some embodiments, a detachable sealing plate  46  is provided at the external circulation air outlet  42 . In this way, when the slim range hood  100  operates in a non-external circulation operation mode, leakage of the oil fume can be avoided. 
     In some embodiments, during the mounting of the slim range hood  100 , whether the slim range hood  100  operates in the external circulation condition or the internal circulation condition in the future can be selected. In a case where the slim range hood  100  operates in the external circulation operation mode, the sealing plate  46  can be removed, and a fume pipe can be connected to the external circulation air outlet  42 . In a case where the slim range hood  100  operates in a non-external circulation operation mode (e.g., the internal circulation operation mode), the sealing plate  46  can be kept at the external circulation air outlet  42  to avoid accidental leakage of the oil fume. 
     In some embodiments, the external circulation air outlet  42  includes an upper air outlet  48  and/or a rear air outlet. In this way, the slim range hood  100  can be suitable for more user mounting sites. 
     In some embodiments, in some embodiments, the external circulation air outlet  42  includes the upper air outlet  48  opened on the top plate  26  and the rear air outlet opened on the rear plate  28 . When leaving the factory, both the upper air outlet  48  and the rear air outlet are mounted with the detachable sealing plate  46 . When the slim range hood  100  is mounted for use, the air outlet can be selected based on a mounting site of the user. For example, when the user&#39;s fume exhaust pipe is arranged above the slim range hood  100 , the sealing plate  46  of the upper air outlet  48  can be removed, the sealing plate  46  of the rear air outlet can be retained, and the fume exhaust pipe can be connected to the upper air outlet  48 . When the user&#39;s fume exhaust pipe is arranged at the rear of the slim range hood  100 , the sealing plate  46  of the rear air outlet can be removed, the sealing plate  46  of the upper air outlet  48  can be retained, and the fume exhaust pipe can be connected to the rear air outlet. 
     It can be understood that, in other embodiments, the external circulation air outlet  42  includes the upper air outlet  48  or the rear air outlet. The user can make a choice based on conditions of his/her mounting site. 
     In some embodiments, the first air outlet part  24  is connected to the air outlet of the air inlet part  22  through the second air outlet part  44 . In this way, the use of components can be reduced. 
     In some embodiments, the air flow discharged from the air inlet part  22  can enter an air flow passage of the first air outlet part  24  through an air flow passage of the second air outlet part  44 , to avoid setting too many air outlets at the air inlet part  22 . 
     In the embodiments, the air outlet of the air inlet part  22  is deviated from a rotation center of the fan  40 , one end of the second air outlet part  44  is connected to the air outlet of the air inlet part  22 , and the first air outlet part  24  is connected to the other end (an end facing away from the air outlet of the air inlet part  22 ) of the second air outlet part  44 . When air exits from the air inlet part  22 , the air flow can change its direction from the air inlet part  22  and pass through a long path before entering the first air outlet part  24 , to reduce noises of the air flow. 
     In some embodiments, the fan assembly  14  includes a movable baffle plate  50  configured to open or close the air flow passage of the first air outlet part  24 . In this way, the operation mode of the slim range hood  100  can be selected. 
     In some embodiments, when the internal circulation operation mode is selected, the baffle plate  50  opens the air flow passage of the first air outlet part  24 . Therefore, the air flow discharged from the air inlet part  22  can enter the first air outlet part  24 , and then be discharged from the internal circulation air outlet  16 . When a non-internal circulation operation mode (e.g., the external circulation operation mode) is selected, the baffle plate  50  closes the air flow passage of the first air outlet part  24 . Therefore, the air flow discharged from the air inlet part  22  cannot enter the first air outlet part  24 , but can be discharged from the external circulation air outlet  42  (e.g., the upper air outlet and/or the rear air outlet). 
       FIG.  13    to  FIG.  15    illustrate a flow path of the air flow (oil fume) when the range hood  100  operates in the internal circulation operation mode, e.g., a flow path indicated by lines with arrows. In some embodiments, when the fan  40  is working, the oil fume is sucked in from the air inlet of the air inlet part  22 , and discharged from the air outlet  221  of the air inlet part  22  to the second air outlet part  44 , enters the first air outlet part  24 , and then enters the air guide cover  20 , and the air guide cover  20  diffuses the oil fume to the entire internal circulation air outlet  16 . 
     In addition to a factor of the user&#39;s selection, the operation mode of the slim range hood  100  may be related to another factor, relevant regulations of a region or a country. For example, in some regions or countries, it is stipulated that the oil fume cannot be discharged outdoors, and the operation mode of the slim range hood  100  may be therefore limited to the internal circulation operation mode. In this case, the baffle plate  50  is opened, and the sealing plate  46  is kept at the external circulation air outlet  42 , and the slim range hood  100  can operate in the internal circulation operation mode. 
     In the embodiments illustrated in the figures, the baffle plate  50  is rotatably arranged in the volute  18 . It can be understood that, in other embodiments. In one embodiment, the baffle plate  50  is slidably arranged in the volute  18 , or arranged in the volute  18  in a compound motion manner of rotation and translation, which is not specifically limited in the present disclosure. 
     In some embodiments, referring to  FIG.  16   , the volute  18  includes a volute tongue part  52 , the volute tongue part  52  has a limiting groove  54  defined on an outer wall thereof, and the limiting groove  54  is configured to limit a closing position of the baffle plate  50 . In this way, operations of the baffle plate  50  can be facilitated. 
     In some embodiments, the limiting groove  54  can limit the closing position of the baffle plate  50 . During a closing process of the baffle plate  50 , an end of the baffle plate  50  enters the limiting groove  54 , and will be restricted by a groove wall of the limiting groove  54  when the closing of the baffle plate  50  continues, to prompt that the baffle plate  50  is in the closing position. A maximum opening position of the baffle plate  50  may be limited by inner walls of the first air outlet part  24 . 
     In the embodiments illustrated in the figures, the first air outlet part  24  uses a partial arc-shaped wall of the air inlet part  22  as a wall of the first air outlet part  24 , and a structural size of the slim range hood  100  can be reduced. 
     In addition, defining the limiting groove  54  on the outer wall of the volute tongue part  52  fully utilizes the structural element of the volute  18  to limit a position of the baffle plate  50 , and avoids an increase in the size and cost of the slim range hood  100  caused by addition of additional structural elements. 
     In some embodiments, referring to  FIG.  5   , the fan assembly  14  includes an operating member  56  mounted outside the volute  18 , and the operating member  56  is connected to the baffle plate  50  and is configured to drive the baffle plate  50  to move. In this way, the selection of the operation mode of the slim range hood  100  can be facilitated. 
     In some embodiments, in some embodiments, the operating member  56  may be a lever located on a lower surface of the first air outlet part  24 . The baffle plate  50  can be rotated by moving the lever, and thus the air flow passage of the first air outlet part  24  can be opened or closed. 
     It can be understood that, in other embodiments, an electric drive device may be used to drive movements of the baffle plate  50 . 
     As an illustration,  FIG.  5    is a schematic bottom view of the slim range hood  100  illustrated in  FIG.  1   . In order to display the air guide cover  20 , a portion of the box body  12  is hidden. 
     In some embodiments, the first air outlet part  24  has a shape that first contracts and then flares along an air flowing direction. In this way, the air flow can be accelerated first and then decelerated. 
     In some embodiments, the first air outlet part  24  may include a first part  58  and a second part  60 . The first part  58  connects the second air outlet part  44  with the second part  60 , and the second part  60  is connected to the air guide cover  20 . When the air flow is discharged from the air inlet part  22  and enters the first part  58  through the second air outlet part  44 , the air flow can decelerate and have its direction changed to reduce the noises of the air flow. When the air flow enters the first part  58  which has a contracting shape, the air flow is accelerated to shorten residence time of the air flow in the first part  58 . When the air flow enters the second part  60  which has a flaring shape, the air flow is diffused to the entire region of the internal circulation air outlet  16  as much as possible while being decelerated to reduce the noises, to ensure the air discharging efficiency. 
     In some embodiments, referring to  FIGS.  25  to  28   , the first air outlet part  24  has a first snap portion  62  provided at an air outlet end thereof, the air guide cover  20  has a second snap portion  64  provided at an air inlet end thereof, and the first snap portion  62  is connected to the second snap portion  64 . In this way, a detachable connection between the air guide cover  20  and the first air outlet part  24  can be realized by means of a snap connection. 
     In some embodiments, the first air outlet part  24  having an air outlet provided at an air outlet end thereof is universal to slim range hoods  100  of different sizes. For the slim range hoods  100  of different sizes, the internal circulation air outlets  16  have different sizes. On the one hand, the air inlet end of the air guide cover  20  matches the air outlet end of the first air outlet part  24 . On the other hand, changing the size of the air outlet end of the air guide cover  20  to match the internal circulation air outlets  16  of different sizes realizes a design of matching the volute  18 , a core component of the fan assembly  14 , with different air guide covers, and different product structure sizes and internal circulation air outlets  16  of different sizes can be satisfied, and the core component is the same for different types of products, thus providing high standardization. 
     In some embodiments, the first snap portion  62  includes two snapping hooks  66  arranged on two outer sides of the air outlet end of the first air outlet part  24  respectively, the second snap portion  64  includes two snapping blocks  68  arranged on two outer sides of the air inlet end of the air guide cover  20  respectively, and the two snapping hooks  66  snap at the two snapping blocks  68 . In this way, a snap connection between the first air outlet part  24  and the air guide cover  20  can be realized. 
     In some embodiments, the snapping hook  66  has a hook that faces towards the first air outlet part  24 , and the snapping block  68  is a convex block. When mounted, the air guide cover  20  can be mounted towards the first air outlet part  24  and the snapping hook  66  is guided to a side wall of the snapping block  68  along an inclined surface of the snapping block, and finally hooks the side wall of the snapping block  68 , and the snapping block  68  is located between the snapping hook  66  and an outer wall of the air guide cover  20 . In addition, the snapping block  68  has a limiting part provided on a top thereof. During mounting, when the snapping hook  66  encounters the limiting part and the mounting is interrupted, it means that the air guide cover  20  is mounted in place. 
     It can be understood that, in other embodiments, the snap connection between the first snap portion  62  and the second snap portion  64  may be in other manners. For example, the first snap portion  62  includes the snapping block  68  and the second snap portion  64  includes the snapping hook  66 ; or the first snap portion  62  includes the snapping hook  66  and the second snap portion  64  includes a snapping groove; or the first snap portion  62  includes the snapping hook  66  and the snapping block  68 , and the second snap portion  64  include the snapping block  68  and the snapping hook  66 ; etc. 
     In addition, the detachable connection between the air guide cover  20  and the first air outlet part  24  is not limited to the snap connection. In one embodiment, the detachable connection may be a screw connection. 
     In some embodiments, a width of an air outlet end of the air guide cover  20  is greater than a width of an air inlet end of the air guide cover  20 . In this way, diffusion of the air flow can be achieved. 
     In some embodiments, the air outlet of the air guide cover  20  is provided at the air outlet end of the air guide cover  20 , and the air inlet of the air guide cover  20  is provided at the air inlet end of the air guide cover  20 . Referring to  FIGS.  19  to  24   , when a size of the internal circulation air outlet  16  is large, in order to diffuse the air flow to the entire region of the internal circulation air outlet  16  as much as possible, the width of the air outlet end of the air guide cover  20  is large to adapt to the internal circulation air outlet  16  of a large size. 
     In some embodiments, referring to  FIG.  11    and  FIG.  12   , an upwardly-inclined flow guide slope  70  is provided inside the air guide cover  20  and extends towards the internal circulation air outlet  16 . In this way, the air flow can smoothly exit obliquely upwards from the slim range hood  100 . 
     In some embodiments, the upwardly-inclined flow guide slope  70  lifts the air flow entering the air guide cover  20 , and along with the downwardly-inclined front plate  30 , smoothly discharges the air flow emitted from the air guide cover  20  upwardly, to avoid discomfort to the user caused by directly blowing the air flow to the user.  FIG.  11    is a schematic cross-sectional view of the slim range hood  100  illustrated in  FIG.  1   , and  FIG.  12    is a schematic cross-sectional view of the slim range hood  100  illustrated in  FIG.  3    or  FIG.  4   . 
     In some embodiments, referring to  FIG.  21    and  FIGS.  29  to  31   , the air inlet part  22  has a mounting structure  72  provided at an air inlet thereof, and the mounting structure  72  is used for mounting an active filtering assembly  74 . In this way, the oil fume can be filtered. 
     In some embodiments, in the internal circulation operation mode of the slim range hood  100 , the oil fume is discharged indoors from the internal circulation air outlet  16 . When the mounting structure  72  is mounted with the active filtering assembly  74 , the active filtering assembly  74  can filter the oil fume to remove odor, which on the one hand, is beneficial to the user health and user experience, and on the other hand, increases selling points of the product. 
     In addition, a filtering screen is mounted at the air inlet of the air inlet part  22 . The filtering screen and the active filtering assembly  74  form dual filtering, to improve the user experience. 
     In an example, the active filtering assembly  74  may include activated carbon. Of course, the active filtering assembly  74  may include other types of active filtering assemblies  74 . 
     The mounting structure  72  on the volute  18  can be molded by a same set of molds having a mounting structure  72 , and the active filtering assembly  74  can be mounted for products having a great thickness, or the active filtering assembly  74  is not mounted for products having a small thickness, and the same volute  18  mold can meet needs of different products. Therefore, the investment is small, and the differentiated needs of different products can be satisfied. 
     In some embodiments, the active filtering assembly  74  is detachably mounted on the mounting structure  72 . In this way, the use of the active filtering assembly  74  may be increased or decreased according to needs. 
     In some embodiments, if the external circulation operation mode is selected when the slim range hood  100  is mounted, since the oil fume is discharged outdoors, the active filtering assembly  74  may not be mounted at the air inlet of the air inlet part  22 . In this case, the filtering screen at the air inlet of the air inlet part  22  filters the oil fume. It can be understood that even if the external circulation operation mode is selected when the slim range hood  100  is mounted. In one embodiment, the active filtering assembly  74  is mounted. 
     If the internal circulation operation mode is selected when the slim range hood  100  is mounted, since the oil fume is discharged indoors, the active filtering assembly  74  can be mounted at the air inlet of the air inlet part  22 . In this case, the filtering screen and the active filtering assembly at the air inlet of the air inlet part  22  filter the oil fume. It can be understood that even if the internal circulation operation mode is selected when the slim range hood  100  is mounted, the active filtering assembly  74  may not be mounted. 
     It should be noted that the active filtering assembly  74  can be mounted on an outer side of the filtering screen, which facilitates mounting and removal of the active filtering assembly  74 . 
     In the embodiments illustrated in the figures, a detachable mounting manner of the active filtering assembly  74  is a rotation-snap manner. In one embodiment, the mounting structure  72  includes a columnar portion  76 . The columnar portion  76  has a snapping groove  78  defined on a circumferential side surface thereof. One end of the snapping groove  78  has an opening, and the other end of the snapping groove  78  is closed. The active filtering assembly  74  has a protruding block  80  provided at a middle portion thereof. During mounting of the active filtering assembly  74 , the protruding block  80  is rotated into the snapping groove  78  from the opening of the snapping groove  78  and abuts against the closed end of the snapping groove  78 , to implement the mounting of the active filtering assembly  74 . During removal of the active filtering assembly  74 , the active filtering assembly  74  is rotated in an opposite direction to detach the protruding block  80  from the snapping groove  78 , to implement the removal of the active filtering assembly  74 . In  FIG.  31   , a clockwise direction in which the active filtering assembly  74  is rotated is a mounting direction, and a counterclockwise direction in which the active filtering assembly  74  is rotated is a removal direction. 
     In the description of this specification, descriptions with reference to the terms “an embodiment”, “some embodiments”, “illustrative embodiments”, “examples”, “specific examples”, or “some examples”, etc., mean that specific features, structure, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. In one embodiment, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner.