Fan assembly and air purification device

Abstract

The present invention relates to the technical field of household appliances, and provides a fan assembly and an air purification device. The fan assembly includes: a cross-flow fan; a main volute, provided on one side of the cross-flow fan and extending along the axial direction of the cross-flow fan; first and second volute tongues are respectively formed at both ends of the side of the main volute facing the cross-flow fan along the circumferential direction of the cross-flow fan. The air purification device includes a machine body and the fan assembly. The cross-flow fan and the main volute are both arranged inside the machine body. An air outlet is formed at the upper part of the machine body, and an air inlet is formed at the lower part of the machine body. By restricting the backflow generated at the first and second volute tongues between the first and second volute tongues and limiting the area of the backflow zone, the present invention can not only improve the stability of the air flow in the air duct, but also reduce the influence of the backflow zone on the air inlet flow and the air outlet flow of the cross-flow fan, thereby improving the fan efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and particularly to a fan assembly and an air purification device. Background Art

[0002] A cross-flow fan, also known as a transverse-flow fan, when rotating, the air flow enters between the blades from one side of the cross-flow fan, passes through the interior of the cross-flow fan, and then is discharged into the volute from between the blades on the other side, thereby forming a working air flow. Since the flow condition of the air flow in the cross-flow fan is very complex, the air flow velocity field is unstable, there are vortices in the cross-flow fan, and the center of the vortex is near the volute tongue of the volute, resulting in the existence of backflows at the volute tongue and its nearby inlet passage and outlet passage. The larger the area of the backflow zone occupies the inlet passage and the outlet passage, the more unstable the air flow in the air duct, the less the inlet air flow and the outlet air flow of the cross-flow fan, and thus the fan efficiency will be reduced. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a fan assembly to limit the backflow zone between a first volute tongue and a second volute tongue, thereby reducing the area of the backflow zone and improving the stability of the air flow in the air duct and the fan efficiency.

[0004] The fan assembly according to an embodiment of the present invention includes:

[0005] A cross-flow fan;

[0006] A main volute, provided on one side of the cross-flow fan and extending along the axial direction of the cross-flow fan; at both ends of the main volute facing the cross-flow fan along the circumferential direction of the cross-flow fan, a first volute tongue and a second volute tongue are respectively formed.

[0007] According to the fan assembly of the first aspect of the present invention, by providing a main volute with a first volute tongue and a second volute tongue on one side of the cross-flow fan, when the cross-flow fan operates, the backflows generated at the first volute tongue and the second volute tongue can be constrained between the first volute tongue and the second volute tongue, the area of the backflow zone is limited, and further the area of the air duct occupied by the backflow zone is reduced. Thus, not only can the stability of the air flow in the air duct be improved, but also the influence of the backflow zone on the inlet air flow and the outlet air flow of the cross-flow fan can be reduced, and the fan efficiency can be improved.

[0008] According to an embodiment of the present invention, the distance between the side of the main volute facing the cross-flow fan and the rotation center of the cross-flow fan reaches a minimum value at the first volute tongue and the second volute tongue.

[0009] According to an embodiment of the present invention, the main volute includes a first guide plate, a second guide plate, and a third guide plate disposed between the first guide plate and the second guide plate. A first volute tongue is formed at the connection between the first guide plate and the third guide plate, and a second volute tongue is formed at the connection between the second guide plate and the third guide plate.

[0010] According to an embodiment of the present invention, the third guide plate includes a first arc-shaped plate adjacent to the first volute tongue and a second arc-shaped plate adjacent to the second volute tongue. One end of the first arc-shaped plate away from the first volute tongue is connected to the second arc-shaped plate. The distance between the first arc-shaped plate and the rotation center of the cross-flow fan gradually increases in the direction from the first volute tongue to the second arc-shaped plate, and the distance between the second arc-shaped plate and the rotation center of the cross-flow fan gradually decreases in the direction from the first arc-shaped plate to the second volute tongue.

[0011] According to an embodiment of the present invention, the third guide plate includes an arc-shaped plate centered on the rotation center of the cross-flow fan.

[0012] According to an embodiment of the present invention, the angles of the first volute tongue and the second volute tongue relative to the rotation center of the cross-flow fan are not less than 30° and not more than 160°.

[0013] According to an embodiment of the present invention, the number of cross-flow fans is multiple, and the multiple cross-flow fans are arranged in sequence along the extension direction of the main volute.

[0014] The air purification device according to the second aspect embodiment of the present invention includes a machine body and the above-mentioned fan assembly; the cross-flow fan and the main volute are both disposed inside the machine body. An air outlet is formed at the upper part of the machine body, and an air inlet is formed at the lower part of the machine body.

[0015] According to an embodiment of the present invention, the cross-flow fan is disposed adjacent to the air inlet, the main volute is disposed above the cross-flow fan, and an air inlet passage and an air outlet passage are formed by the enclosure of the main volute and the inner wall of the machine body. The air inlet passage extends from the air inlet to the first volute tongue, and the air outlet passage extends from the second volute tongue to the air outlet.

[0016] According to an embodiment of the present invention, the air outlet is formed on the front side wall of the machine body. An upper volute is disposed in the air outlet passage. The upper volute is located above the air outlet. One end of the upper volute extends to the rear side wall of the machine body, and the other end of the upper volute extends to the upper edge of the air outlet.

[0017] According to an embodiment of the present invention, the air outlet direction of the air outlet is inclined upward, and the angle between the plane where the air outlet is located and the vertical direction is not less than 10° and not more than 45°.

[0018] According to an embodiment of the present invention, the air inlet is an arc-shaped opening extending from top to bottom, and the opening angle of the air inlet is not less than 60° and not greater than 170°.

[0019] According to an embodiment of the present invention, the air inlet is located above the lowest point of the body, and the included angle between the lower edge of the air inlet and the vertical direction is not less than 5° and not greater than 30°.

[0020] According to an embodiment of the present invention, the body includes a front plate, a back plate, and side enclosing plates disposed between the front plate and the back plate; the front plate includes a flat plate and a curved plate disposed below the flat plate, the flat plate is inclined downward and away from the back plate from top to bottom, one end of the curved plate is connected to the lower edge of the flat plate, and the other end of the curved plate is connected to the lower edge of the back plate; the air outlet is formed in the flat plate, and the air inlet is formed in the curved plate.

[0021] According to an embodiment of the present invention, the upper edge of the flat plate extends to the back plate, and the included angle between the flat plate and the vertical direction is not less than 10°.

[0022] According to an embodiment of the present invention, the body is provided with a cover plate that can be opened and closed at the air inlet and / or the air outlet.

[0023] According to an embodiment of the present invention, the air purification device is a range hood.

[0024] One or more of the above technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0025] In the present invention, by providing a main volute with a first volute tongue and a second volute tongue on one side of the cross-flow fan in the fan assembly, the recirculation generated at the first volute tongue and the second volute tongue can be constrained between the first volute tongue and the second volute tongue when the cross-flow fan is running, the area of the recirculation zone is limited, and further the occupied area of the recirculation zone in the air duct is reduced. Thus, not only can the stability of the air flow in the air duct be improved, but also the influence of the recirculation zone on the incoming air flow and the outgoing air flow of the cross-flow fan can be reduced, and the fan efficiency can be improved.

[0026] By adopting the above fan assembly in the air purification device of the present invention, the recirculation generated at the first volute tongue and the second volute tongue can be constrained between the first volute tongue and the second volute tongue, thereby improving the stability of the air flow in the air duct, reducing the influence of the recirculation zone on the incoming air flow and the outgoing air flow of the cross-flow fan, and improving the air purification efficiency.

[0027] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 is a schematic perspective view of a fan assembly provided by an embodiment of the present invention;

[0030] Figure 2 is a left view schematic diagram of a fan assembly provided by an embodiment of the present invention;

[0031] Figure 3 is a left view schematic diagram of an air purification device (without side enclosures) provided by an embodiment of the present invention;

[0032] Figure 4 is one of the schematic perspective views of an air purification device (with the cover plate in the open state) provided by an embodiment of the present invention;

[0033] Figure 5 is another schematic perspective view of an air purification device (with the cover plate in the open state) provided by an embodiment of the present invention;

[0034] Figure 6 is a schematic perspective view of an air purification device (with the cover plate in the closed state) provided by an embodiment of the present invention;

[0035] Figure 7 is a schematic perspective view of a machine body provided by an embodiment of the present invention;

[0036] Figure 8 is a schematic perspective view of an air purification device (without a front plate and side enclosures) provided by an embodiment of the present invention.

[0037] Reference numerals:

[0038] 100, cross-flow fan; 200, main volute; 201, first volute tongue; 202, second volute tongue;

[0039] 210, first guide plate; 220, second guide plate; 230, third guide plate; 300, machine body;

[0040] 301, air inlet; 302, air outlet; 303, air inlet passage; 304, air outlet passage; 310, front plate;

[0041] 311, flat plate; 312, curved plate; 320, back plate; 330, side enclosure; 400, upper volute;

[0042] 500, Cover plate; 600, Protective member; 700, Motor. Detailed implementation manners

[0043] The following further describes in detail the implementation manners of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0044] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0045] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0046] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0047] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0048] Combined with Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a fan assembly, which includes a cross-flow fan 100 and a main volute 200. The main volute 200 is arranged on one side of the cross-flow fan 100 and extends along the axial direction of the cross-flow fan 100; along the circumferential direction of the cross-flow fan 100, at both ends of the side of the main volute 200 facing the cross-flow fan 100, a first volute tongue 201 and a second volute tongue 202 are respectively formed. Thus, when the cross-flow fan 100 operates, the recirculation generated at the first volute tongue 201 and the second volute tongue 202 can be constrained between the first volute tongue 201 and the second volute tongue 202, restricting the area of the recirculation zone, and further reducing the occupied area of the recirculation zone on the air duct. Thereby, not only the stability of the air flow in the air duct can be improved, but also the influence of the recirculation zone on the inlet air flow and the outlet air flow of the cross-flow fan 100 can be reduced to improve the fan efficiency.

[0049] Taking Figure 1 the shown orientation as a reference, the main volute 200 is arranged above the cross-flow fan 100, and the blades of the cross-flow fan 100 extend in the left-right direction.

[0050] Furthermore, the distance between the side of the main volute 200 facing the cross-flow fan 100 and the rotation center of the cross-flow fan 100 reaches a minimum value at the first volute tongue 201 and the second volute tongue 202. That is to say, the distance D between the first volute tongue 201 and the rotation center of the cross-flow fan 100 is equal to the distance between the second volute tongue 202 and the rotation center of the cross-flow fan 100, and the distance between any point of the main volute 200 located between the first volute tongue 201 and the second volute tongue 202 and the rotation center of the cross-flow fan 100 is greater than D.

[0051] The main volute 200 includes a first guide plate 210, a second guide plate 220, and a third guide plate 230. The third guide plate 230 extends in the left-right direction. The first guide plate 210 and the second guide plate 220 are respectively located on the front and rear sides of the third guide plate 230. A first volute tongue 201 is formed at the connection between the third guide plate 230 and the first guide plate 210, and a second volute tongue 202 is formed at the connection between the third guide plate 230 and the second guide plate 220. The included angle α of the first volute tongue 201 and the second volute tongue 202 relative to the rotation center of the cross-flow fan 100, that is, the included angle α between the rotation center of the cross-flow fan 100 and the connecting lines of the first volute tongue 201 and the second volute tongue 202 respectively, is not less than 30° and not greater than 160°. For example, the value range of this included angle α is 80° - 120°.

[0052] Since the distance D between the first volute tongue 201 and the rotation center of the cross-flow fan 100 is equal to the distance between the second volute tongue 202 and the rotation center of the cross-flow fan 100, and for any point on the third guide plate 230 (which is the side of the main volute 200 facing the cross-flow fan 100) between the first volute tongue 201 and the second volute tongue 202, the distance from this point to the rotation center of the cross-flow fan 100 is greater than D. Therefore, the backflows generated at the first volute tongue 201 and the second volute tongue 202 will be restricted between the first volute tongue 201 and the second volute tongue 202. Thus, the area of the backflow region can be limited, and further, the occupied area of the backflow region in the air duct can be reduced. Thereby, not only the stability of the air flow in the air duct can be improved, but also the influence of the backflow region on the inlet air flow and the outlet air flow of the cross-flow fan 100 can be reduced, and the fan efficiency can be improved.

[0053] It should be noted that although the distance between the rotation center of the cross-flow fan 100 and the main volute 200 reaches a minimum value at the first volute tongue 201 and the second volute tongue 202, the distances between each point on the third guide plate 230 between the first volute tongue 201 and the second volute tongue 202 and the rotation center of the cross-flow fan 100 can be either different or the same. For example, as Figure 2 shown, in the direction from the first volute tongue 201 to the second volute tongue 202, the distances between each point on the third guide plate 230 between the first volute tongue 201 and the second volute tongue 202 and the rotation center of the cross-flow fan 100 first increase and then decrease. That is to say, the third guide plate 230 includes a first arc-shaped plate and a second arc-shaped plate. One end of the first arc-shaped plate is adjacent to the first volute tongue 201, the other end of the first arc-shaped plate is connected to the second arc-shaped plate, and the end of the second arc-shaped plate away from the first arc-shaped plate is adjacent to the second volute tongue 202. Among them, for the first arc-shaped plate, in the direction from the first volute tongue 201 to the second arc-shaped plate, that is, Figure 1 the direction from front to back in Figure 1In the front-to-back direction, the distance between the second arc-shaped plate and the rotation center of the cross-flow fan 100 gradually decreases. For another example, the distances between the points of the third guide plate 230 located between the first volute tongue 201 and the second volute tongue 202 and the rotation center of the cross-flow fan 100 are equal. That is to say, the third guide plate 230 includes an arc-shaped plate, and the center of the arc-shaped plate is concentric with the rotation center of the cross-flow fan 100.

[0054] In addition, the fan assembly further includes a fan driving member for driving the cross-flow fan 100 to rotate. Specifically, the fan driving member includes a motor 700. The motor 700 can be directly connected to the cross-flow fan 100 or can be connected to the cross-flow fan 100 through a transmission mechanism. Among them, the transmission mechanism can be, but is not limited to, a pulley mechanism or a gear and chain mechanism. Taking the pulley mechanism as an example, the pulley mechanism includes a driving pulley, a driven pulley and a belt. The driving pulley is fixed to the output shaft of the motor 700, the driven pulley is fixed to the rotating shaft of the cross-flow fan 100, and the driving pulley is drivingly connected to the driven pulley through the belt. Thus, after the motor 700 is started, the driving pulley rotates synchronously, and the driving pulley will drive the driven pulley to rotate through the belt, and then drive the cross-flow fan 100 fixedly connected to the driven pulley to rotate. Since the installation method of the gear and chain mechanism is similar to that of the pulley mechanism, it will not be elaborated here. Compared with the case where the motor 700 is directly connected to the cross-flow fan 100, although the indirect connection of the motor 700 to the cross-flow fan 100 through the transmission mechanism can improve the aerodynamic performance of the cross-flow fan 100, it will also increase the risk of the whole machine vibration. Therefore, in the actual production process, the designer can select the connection method of the motor 700 according to the focus of the actual needs of the user.

[0055] It should be noted that the fan assembly in this embodiment can have only one cross-flow fan 100 or can have multiple cross-flow fans 100. When the fan assembly includes multiple cross-flow fans 100, the multiple cross-flow fans 100 are arranged in sequence along the extension direction of the main volute 200. For example, taking Figure 1 the shown orientation as a reference, when the fan assembly includes two cross-flow fans 100, the fan driving member includes a dual-axis motor. The two cross-flow fans 100 are respectively arranged on the left and right sides of the dual-axis motor. One output shaft of the dual-axis motor is connected to the rotating shaft of one of the cross-flow fans 100, and the other output shaft of the dual-axis motor is connected to the rotating shaft of the remaining cross-flow fan 100. In addition, in order to reduce the influence of the end effect on the airflow of the cross-flow fan 100, the two ends of the cross-flow fan 100 can be respectively covered with fan covers.

[0056] Combined with Figures 3 to 8As shown in the figure, an embodiment of the present invention further provides an air purification device, which includes a body 300 and a fan assembly. The fan assembly, namely the cross-flow fan 100 and the main volute 200, is disposed inside the body 300. An air outlet 302 is formed at the upper part of the body 300, and an air inlet 301 is formed at the lower part of the body 300.

[0057] By adopting the above-mentioned fan assembly in the air purification device of this embodiment, the recirculation generated at the first volute tongue 201 and the second volute tongue 202 can be constrained between the first volute tongue 201 and the second volute tongue 202, thereby improving the stability of the air flow in the air duct, reducing the influence of the recirculation area on the inlet air flow and the outlet air flow of the cross-flow fan 100, and improving the air purification efficiency.

[0058] The air purification device in this embodiment can be, but is not limited to, a range hood. Taking the air purification device as a commonly used range hood in the kitchen as an example, as Figure 3 and Figure 7 shown, the air outlet 302 is formed at the upper part of the front side wall of the body 300, the air inlet 301 is formed at the lower part of the front side wall of the body 300, the cross-flow fan 100 is disposed adjacent to the air inlet 301, and the main volute 200 is disposed above the cross-flow fan 100. The front side wall of the main volute 200, namely the first guide plate 210, and the inner wall of the body 300 enclose to form an air inlet passage 303, and the air inlet passage 303 extends from the air inlet 301 of the body 300 to the first volute tongue 201; the rear side wall of the main volute 200, namely the second guide plate 220, and the inner wall of the body 300 enclose to form an air outlet passage 304, and the air outlet passage 304 extends from the second volute tongue 202 to the air outlet 302 of the body 300. Thus, a negative pressure area will be formed near the air inlet 301 after the cross-flow fan 100 is started, and the cooking fumes generated will be quickly sucked into the air inlet passage 303 under the drive of the pressure difference, and the fumes in the air inlet passage 303 will be discharged from the air outlet 302 along the air outlet passage 304 under the drive of the cross-flow fan 100.

[0059] It should be noted that for the air outlet 302, in addition to being formed on the side wall of the body 300, the air outlet 302 can also be formed on the top surface of the body 300. Compared with setting the air outlet 302 on the top surface of the body 300, when the air outlet 302 is disposed on the side wall of the body 300, the air flow discharged from the air outlet 302 can be prevented from directly impacting the cabinet above the air purification device, thereby not only reducing the air flow resistance, but also reducing the noise. As Figure 3As shown, the air outlet direction of the air outlet 302 is inclined upward, and the angle θ between the plane where the air outlet 302 is located and the vertical direction is not less than 10° and not more than 45°. For example, the value range of the angle between the plane where the air outlet 302 is located and the vertical direction is 20° to 30°. This angle range can avoid the air flow discharged from the air outlet 302 directly blowing on the user's face due to too small an angle between the plane where the air outlet 302 is located and the vertical direction, and can also avoid the air flow discharged from the air outlet 302 directly blowing on the mechanism above the air purification device, such as a cabinet, due to too large an angle between the plane where the air outlet 302 is located and the vertical direction, thereby generating additional resistance and noise. Similarly, for the air inlet 301, the air inlet 301 can be formed at the lower part of the front side wall of the body 300 or on the bottom surface of the body 300. As Figure 3 shown, the air inlet direction of the air inlet 301 is inclined upward, the air inlet 301 is an arc-shaped opening extending from top to bottom, and the opening angle γ of the air inlet 301 is not less than 60° and not more than 170°. This angle range can avoid air return due to too large an opening angle of the air inlet 301 and can also avoid insufficient air intake due to too small an opening angle of the air inlet 301. To prevent the air purification device from dripping oil or water from the air inlet 301, the air inlet 301 is located above the lowest point of the body 300. That is to say, as Figure 3 shown, the entire air inlet 301 is located on the front side of the vertical plane where the lowest point of the body 300 is located, and the angle β between the lower edge of the air inlet 301 and the vertical direction should not be less than 5°. In addition, on the basis of preventing oil and water dripping, to avoid the air inlet direction of the air inlet 301 being too upward to inhale the oil fume generated directly below the body 300, the angle β between the lower edge of the air inlet 301 and the vertical direction should not be greater than 30°.

[0060] Considering that when the air outlet 302 is formed on the front side wall of the body 300, the air flow in the area above the air outlet 302 inside the body 300, that is, the air flow at the top of the body 300, cannot be discharged in time, and the air flow is likely to generate vortices in this area, thereby generating noise. To avoid the above phenomenon and ensure that all the air flow in the air outlet channel 304 is smoothly discharged from the air outlet 302, as Figure 3 and Figure 8As shown, the air purification device further includes an upper volute 400. The upper volute 400 is disposed in the air outlet passage 304 and above the air outlet 302. One end of the upper volute 400 extends to the rear side wall of the body 300, and the other end of the upper volute 400 extends to the upper edge of the air outlet 302. Among them, the upper volute 400 can be integrally formed with the body 300, and of course, the upper volute 400 can also be fixed to the body 300 by welding or fasteners. Thus, when the flue gas discharged from the cross-flow fan 100 flows upward along the air outlet passage 304, the flue gas will be blocked by the upper volute 400 and then flow toward the air outlet 302 along the bottom surface of the upper volute 400. In order to better guide the air flow to turn to the air outlet 302, the bottom surface of the upper volute 400 is inclined upward from the end connected to the rear side wall of the body 300 to the end connected to the air outlet 302. In addition, in order to reduce the flow resistance, the bottom surface of the upper volute 400 is a smooth curved surface. For example, as Figure 3 shown, the bottom surface of the upper volute 400 is a curved surface bulging upward. Of course, the bottom surface of the upper volute 400 can also be composed of multiple planes. For example, the bottom surface of the upper volute 400 includes a first plane and a second plane. One end of the first plane extends to the rear side wall of the body 300, the other end of the first plane extends to one end of the second plane, the other end of the second plane extends to the upper edge of the air outlet 302, and the included angle between the first plane and the second plane is not less than 120°.

[0061] As Figure 4 , Figure 5 and Figure 7 shown, the body 300 includes a front plate 310, a back plate 320 and side enclosing plates 330. The side enclosing plates 330 are located between the front plate 310 and the back plate 320. The front plate 310, the side enclosing plates 330 and the back plate 320 jointly enclose to form the internal space of the body 300; the front plate 310 includes a flat plate 311 and a curved plate 312. The flat plate 311 is disposed above the curved plate 312. An air outlet 302 is formed on the flat plate 311, and an air inlet 301 is formed on the curved plate 312; the flat plate 311 is inclined downward away from the back plate 320 from top to bottom, that is to say, the distance between the flat plate 311 and the back plate 320 gradually increases from top to bottom; one end of the curved plate 312 is connected to the lower edge of the flat plate 311, and the other end of the curved plate 312 is connected to the lower edge of the back plate 320. Among them, the flat plate 311 can be directly connected to the back plate 320, or can be indirectly connected to the back plate 320 through the side enclosing plates 330. For example, as Figure 3As shown, the upper edge of the flat panel 311 extends to the back panel 320, that is, the flat panel 311 and the back panel 320 enclose an inverted V-shaped structure. In this case, the side enclosure panel 330 includes a left side panel and a right side panel. The left edge of the back panel 320 and the left edge of the front panel 310 are respectively connected to the left side panel, and the right edge of the back panel 320 and the right edge of the front panel 310 are respectively connected to the right side panel. Of course, to avoid the air outlet channel 304 being too narrow, the angle between the flat panel 311 and the vertical direction should be not less than 10°. If the upper edge of the flat panel 311 does not extend to the back panel 320, then in addition to the left side panel and the right side panel, the side enclosure panel 330 further includes a top side panel located above the left side panel and the right side panel. The upper edge of the back panel 320 and the upper edge of the front panel 310 are respectively connected to the top side panel. Due to the presence of the top side panel, the air outlet channel 304 will not be too narrow. Therefore, in this case, the angle between the flat panel 311 and the vertical direction can be less than 10°

[0062] As Figure 6 shown, in the direction from the lower edge of the back panel 320 to the lower edge of the flat panel 311, the curved panel 312 extends in an Archimedean spiral. That is to say, taking the orientation shown in Figure 3 as a reference, the left view or the right view of the curved panel 312 is a curve, and this curve is a part of the Archimedean spiral. To improve the aesthetics and at the same time avoid scratching the user by the body 300, the curved panel 312 and the flat panel 311 are in smooth transition. Thus, as Figure 7 shown, the entire body 300 is in a water droplet shape. The advantages of such a setting are as follows: on the one hand, the characteristics that the lower space of the water droplet-shaped structure is large and the upper space is small can be utilized, which can not only ensure the installation of the cross-flow fan 100 in the body 300, but also avoid the waste of the space inside the body 300, making the inside of the body 300 more compact; on the other hand, it can also improve the aesthetics and reduce the occupied space of the body 300.

[0063] To ensure the smoking effect, the blade length of the cross-flow fan 100 is not less than the length of the air inlet 301, that is, taking the orientation shown in Figure 3 as a reference, the blade length of the cross-flow fan 100 is not less than the dimension of the air inlet 301 in the left-right direction.

[0064] In addition, the body 300 is also provided with a cover plate 500 that can be opened and closed at the air inlet 301 and / or the air outlet 302. Taking the air inlet 301 as an example, the cover plate 500 can be rotatably connected to the body 300 or slidably arranged on the body 300. When the cover plate 500 is rotatably connected to the body 300, one end of the cover plate 500 can be rotatably fixed to the body 300 through a rotating shaft, and thus the size of the air inlet 301 can be adjusted by rotating the other end of the cover plate 500; similarly, when the cover plate 500 is slidably connected to the body 300, a sliding groove can be provided in one of the cover plate 500 and the body 300, and a sliding block can be provided in the other, and the sliding block is slidably embedded in the sliding groove, and thus the size of the air inlet 301 can be adjusted by pushing the cover plate 500. It can be seen that in this embodiment, by providing the cover plate 500 at the air inlet 301, not only can the size of the air inlet 301 be adjusted, thereby changing the air intake volume, but also the air inlet 301 can be closed when the cross-flow fan 100 stops running, reducing dust accumulation and improving the aesthetics at the same time. Among them, the installation method of the cover plate 500 at the air outlet 302 is similar to the above, and will not be elaborated here.

[0065] It should be noted that for the air inlet 301, as Figure 3 and Figure 4 shown, when the cover plate 500 is rotatably connected to the body 300, the cover plate 500 is rotatably connected to the upper edge of the air inlet 301. The advantages of such a setting are as follows: on the one hand, after the cover plate 500 opens the air inlet 301, the cooking fumes enter the air inlet 301 from below the cover plate 500, so that the cooking fumes can be prevented from being blocked by the cover plate 500 and unable to quickly enter the body 300 through the air inlet 301; on the other hand, due to the presence of the cover plate 500, when the cooking fumes generated during the cooking process rise to the cover plate 500, the cooking fumes will be blocked by the cover plate 500 and quickly enter the corresponding air inlet 301 along the cover plate 500. In order to prevent the cover plate 500 from affecting the user's line of sight, the distance between the cover plate 500 and the back plate 320 is not less than 200 mm and not more than 450 mm. For example, the distance range between the cover plate 500 and the back plate 320 is between 300 mm and 450 mm. In addition, in order to achieve the effect of trapping fumes, the lower part of the cover plate 500 can be bent downward, that is, the cover plate 500 is generally in an L shape.

[0066] In addition, in order to automatically adjust the sizes of the air inlet 301 and / or the air outlet 302 according to the air volume of the cross-flow fan 100, i.e., the gear position of the fan driving member, the air purification device further includes a driving member corresponding to the cover plate 500. The driving member is installed on the body 300 and is linked with the fan driving member. The driving member can control the opening and closing of the cover plate 500 according to the gear position of the fan driving member. Still taking the air inlet 301 as an example below, when the cover plate 500 at the air inlet 301 is rotatably connected to the body 300, the driving member can be a driving motor connected to the rotating shaft of the cover plate 500, and the driving motor is linked with the fan driving member; when the cover plate 500 at the air inlet 301 is slidably connected to the body 300, the driving member can be, but is not limited to, a micro cylinder or a lead screw mechanism. If the driving member is a micro cylinder, the cylinder body of the micro cylinder is fixed to the body 300, and the piston rod of the micro cylinder extends along the height direction of the air inlet 301 and is connected to the cover plate 500. Thus, when the piston rod moves relative to the cylinder body, the cover plate 500 can be driven to slide relative to the body 300, thereby opening or closing the corresponding air inlet 301. If the driving member is a lead screw mechanism, a chute can be provided on the body 300, a slider can be fixed on the cover plate 500, and the slider is slidably embedded in the chute. At the same time, the lead screw needs to be rotatably installed on the body 300 and be parallel to the chute. The slider is provided with a threaded through hole that is in threaded cooperation with the lead screw. Thus, when the lead screw motor 700 drives the lead screw to rotate, the slider will move along the lead screw, thereby driving the cover plate 500 fixed to it to slide relative to the body 300.

[0067] To improve safety and prevent users from being injured due to accidentally touching the operating cross-flow fan 100, as Figure 4 shown, at least one of the air inlet 301 and the air outlet 302 is provided with a protective member 600, and the protective member 600 is provided with a plurality of ventilation holes. Taking the air inlet 301 as an example, the protective member 600 can be, but is not limited to, a protective grille or a protective net. Of course, in order to facilitate the later cleaning and maintenance of the cross-flow fan 100, the protective member 600 is detachably connected to the body 300. For example, the protective member 600 is snap-connected or thread-connected to the body 300.

[0068] In addition, an air purification component is provided in the air outlet passage 304 to separate the oil fume in the air flow in the air outlet passage 304. Among them, the air purification component can be in a plate-like structure. For example, the air purification component is plate-shaped activated carbon cotton. In order to increase the contact area between the air purification component and the air flow, the air purification component can be an arc-shaped plate. The air purification component bends upward, one end of the air purification component extends to the back plate 320 of the machine body 300, and the other end of the air purification component extends to the second guide plate 220 of the main volute 200. In order to improve the purification efficiency, an air purification component can also be provided in the air inlet passage 303 at the same time. Its installation method and type are similar to those of the air purification component in the air outlet passage 304, which will not be elaborated here. Of course, an air purification component can also be provided only in the air inlet passage 303. It should be noted that, in order to facilitate the replacement of the air purification component, the air purification component can also be directly installed at the air inlet 301 and / or the air outlet 302.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0070] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that various combinations, modifications or equivalent replacements of the technical solutions of the present invention do not deviate from the spirit and scope of the technical solutions of the present invention, and should all be covered by the scope of the claims of the present invention.

Claims

1. An air purification device, characterized in that, it comprises a body and a fan assembly; The fan assembly includes: A cross-flow fan; A main volute, provided on one side of the cross-flow fan and extending along the axial direction of the cross-flow fan; along the circumferential direction of the cross-flow fan, at both ends of the side of the main volute facing the cross-flow fan, a first volute tongue and a second volute tongue are respectively formed; Both the cross-flow fan and the main volute are provided in the body, an air outlet is formed in the upper part of the body, and an air inlet is formed in the lower part of the body; The body includes a front plate, a back plate and side enclosing plates provided between the front plate and the back plate; the front plate includes a flat plate and a curved plate provided below the flat plate, the flat plate is inclined downward and away from the back plate, one end of the curved plate is connected to the lower edge of the flat plate, and the other end of the curved plate is connected to the lower edge of the back plate; the air outlet is formed in the flat plate, and the air inlet is formed in the curved plate.

2. The air purification device according to claim 1, characterized in that, The distance between the side of the main volute facing the cross-flow fan and the rotation center of the cross-flow fan reaches a minimum value at the first volute tongue and the second volute tongue.

3. The air purification device according to claim 1, characterized in that, The main volute includes a first guide plate, a second guide plate and a third guide plate provided between the first guide plate and the second guide plate, the connection between the first guide plate and the third guide plate forms the first volute tongue, and the connection between the second guide plate and the third guide plate forms the second volute tongue.

4. The air purification device according to claim 3, characterized in that, The third guide plate includes a first arc plate adjacent to the first volute tongue and a second arc plate adjacent to the second volute tongue, one end of the first arc plate away from the first volute tongue is connected to the second arc plate, the distance between the first arc plate and the rotation center of the cross-flow fan gradually increases from the direction of the first volute tongue to the second arc plate, and the distance between the second arc plate and the rotation center of the cross-flow fan gradually decreases from the direction of the first arc plate to the second volute tongue.

5. The air purification device according to claim 3, characterized in that, The third guide plate includes an arc plate centered on the rotation center of the cross-flow fan.

6. The air purification device according to claim 1, characterized in that, The included angles of the first volute tongue and the second volute tongue relative to the rotation center of the cross-flow fan are not less than 30° and not more than 160°.

7. The air purification device according to claim 1, characterized in that, The number of the cross-flow fans is multiple, and the multiple cross-flow fans are arranged in sequence along the extension direction of the main volute.

8. The air purification device according to claim 1, characterized in that, The cross-flow fan is arranged adjacent to the air inlet, the main volute is arranged above the cross-flow fan, and the main volute and the inner wall of the machine body enclose an air inlet passage and an air outlet passage. The air inlet passage extends from the air inlet to the first volute tongue, and the air outlet passage extends from the second volute tongue to the air outlet.

9. The air purification device according to claim 8, wherein, the air outlet is formed on the front side wall of the machine body, an upper volute is arranged in the air outlet passage, the upper volute is located above the air outlet, one end of the upper volute extends to the rear side wall of the machine body, and the other end of the upper volute extends to the upper edge of the air outlet.

10. The air purification device according to claim 1, wherein, the air outlet direction of the air outlet is inclined upward, and the included angle between the plane where the air outlet is located and the vertical direction is not less than 10° and not more than 45°.

11. The air purification device according to claim 1, wherein, the air inlet is an arc-shaped opening extending from top to bottom, and the opening angle of the air inlet is not less than 60° and not more than 170°.

12. The air purification device according to claim 11, wherein, the air inlet is located above the lowest point of the machine body, and the included angle between the lower edge of the air inlet and the vertical direction is not less than 5° and not more than 30°.

13. The air purification device according to claim 1, wherein, the upper edge of the flat plate extends to the back plate, and the included angle between the flat plate and the vertical direction is not less than 10°.

14. The air purification device according to any one of claims 1 to 12, wherein, the machine body is provided with a cover plate that can be opened and closed at the air inlet and / or the air outlet.

15. The air purification device according to any one of claims 1 to 12, wherein, the air purification device is a range hood.

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