CN112161306A - Fume exhaust fan - Google Patents

Abstract

The invention discloses a range hood, which comprises a shell and a panel assembly arranged on the front side of the shell, wherein an air inlet is formed in the panel assembly, a smoke baffle is arranged on the front side of the panel assembly, the range hood also comprises a balancing device, the balancing device comprises a single-fan balancing assembly which can suck oil smoke into the interior, discharge the oil smoke out of the range hood and suck fresh air, a first air curtain assembly which blows air introduced by the single-fan balancing assembly from the top end of the panel assembly to the smoke baffle to form an upper air curtain, and a second air curtain assembly which blows air introduced by the single-fan balancing assembly from the bottom end of the panel assembly to the smoke baffle to form a lower air curtain. Compared with the prior art, the invention has the advantages that: an air flow barrier is formed under the action of the upper air curtain and the lower air curtain, so that air flow is effectively guided to be sucked into the range hood and does not escape outwards, the rest upper air curtain and the rest lower air curtain enter the room to realize air flow supplement and balance, and the indoor and outdoor pressure balance can be realized without opening windows in the cooking process.

Description

Fume exhaust fan

Technical Field

The invention relates to an oil fume purification device, in particular to a range hood.

Background

The range hood has become one of the indispensable kitchen household electrical appliances in modern families. The range hood works by utilizing the fluid dynamics principle, sucks and exhausts oil smoke through a centrifugal fan arranged in the range hood, and filters partial grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, oil smoke below the range hood is sucked into the fan, accelerated by the fan and then collected and guided by the volute to be discharged out of a room.

In the northern weather, the floor heating is laid indoors, the sealing performance is good, and when a user carries out cooking experience, if a fan system of the range hood is not opened, indoor air can be discharged outdoors, so that the indoor atmospheric pressure is gradually lower than that outdoors, the air pressure difference is caused, the oil smoke absorption effect is seriously influenced, and the smoke leakage phenomenon is caused; if the window is opened, indoor air can be exhausted outdoors through the range hood, and outdoor cold air can enter the room to cause the indoor temperature to drop and cause discomfort; the existing range hood cannot solve the problem, so that the range hood which can be used in northern floor heating families is developed, and the range hood has important practical significance.

The oil absorption cigarette effect is range hood's important performance index, and the user can discover after using range hood culinary art at present that top of a kitchen range, wall, range hood fuselage all can be stained with the oil smoke, and it is very hard to experience when not good to clean, and this is because partial oil smoke flees among the culinary art in-process, through wall ceramic tile, glass condensation, so promote range hood oil absorption cigarette effect also extremely important. In addition, the noise is also the important performance index of range hood, and side suction range hood commonly used at present, because the fan system is put down, the air intake is close to the people body, so the noise is generally great, warms up indoor in the north because atmospheric pressure changes leads to air intake pressure unstable, and the noise grow makes user experience not good. The existing method for improving the oil smoke absorption effect and reducing the noise of the range hood is to improve the molded line of a volute of a host fan system, or optimize an internal flow field, or attach sound-absorbing cotton, rarely improve the external flow field, and has little effect on improving the oil smoke absorption effect and reducing the noise.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a range hood aiming at the defects of the prior art, so that the indoor and outdoor pressure balance can be achieved without opening a window in the cooking process, and the oil fume suction effect is improved.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a range hood, includes casing and the panel components of setting in the casing front side, the air intake has been seted up on the panel components, the front side of panel components is provided with the cigarette board that keeps off, keep off cigarette board and air intake interval ground mutual disposition and form the structure of suspension baffle, its characterized in that: the range hood further comprises a balancing device, the balancing device comprises a single-fan balancing component which can suck oil smoke into the interior, discharge the oil smoke out of the range hood and suck fresh air, a first air curtain component which blows air introduced by the single-fan balancing component from the top end of the panel component to the direction of the smoke baffle to form an upper air curtain, and a second air curtain component which blows air introduced by the single-fan balancing component from the bottom end of the panel component to the direction of the smoke baffle to form a lower air curtain.

Further, in order to facilitate the realization of oil smoke absorption and fresh air absorption with a small size and a simple structure, the single fan balance assembly comprises a main impeller, a main motor, a volute and a balance impeller, the volute is axially divided into a first cavity positioned on the front side and a second cavity positioned on the rear side, the main impeller is positioned in the first cavity, the balance impeller is positioned in the second cavity, the main motor is arranged in the volute and can simultaneously drive the main impeller and the balance impeller, so that the main impeller can suck oil smoke and discharge the oil smoke out of the range hood, and the balance impeller can suck fresh air.

Further, in order to facilitate the division of the volute and the fixing of the main motor, a wheel disc is arranged in the volute to divide the volute into two axially independent cavities, and the main motor penetrates through the wheel disc and is fixed.

Further, in order to facilitate oil smoke suction and discharge, air is sucked and discharged, and oil smoke and air are not affected with each other, a fan air inlet is formed in the front end of the first cavity of the volute, the fan air inlet is opposite to the air inlet, an air curtain air outlet enabling the second cavity to be in fluid communication with the first air curtain assembly and the second air curtain assembly respectively is formed in the rear end of the second cavity of the volute, and a fan air outlet corresponding to the first cavity and an air curtain air inlet corresponding to the second cavity are formed in the outlet of the volute respectively.

Further, in order to connect the range hood with an external smoke exhaust pipe conveniently, an air outlet cover is arranged at an outlet of the volute and is a double-cavity cover body matched with the volute.

Further, for being convenient for will introduce two air curtain subassemblies of air escape in the spiral case, the balanced subassembly of single fan still includes the reposition of redundant personnel pipeline, the reposition of redundant personnel pipeline includes the drainage cover, the shunt tubes of being connected with the drainage cover, the opening side cover of drainage cover is on the air curtain air outlet, the one end and the first air curtain subassembly of shunt tubes are connected and make drainage cover and second air curtain subassembly fluid intercommunication, the other end and the second air curtain subassembly of shunt tubes are connected and make drainage cover and second air curtain subassembly fluid intercommunication.

Further, in order to facilitate the downward blowing of the first air curtain assembly, the first air curtain assembly comprises a first shell, the first shell is in a hollow long strip shape, extends in the left-right direction and is arranged at the front end of the top of the shell, the rear side of the first shell is communicated with the single-fan balance assembly in a fluid mode, and a first air outlet for downward blowing is formed in the front end portion of the first shell and located at the front side of the panel assembly.

Further, for being convenient for discharge and filter before indoor at the air, avoid influencing indoor environment and user, first air curtain subassembly still includes first enclosing cover and the first filter screen subassembly of setting in first shell, first shell upper shed, the top at first shell is established to first enclosing cover lid, first filter screen subassembly includes first filter screen and first filter screen support, first spacing chamber has been seted up at first filter screen support's rear portion, first filter screen inserts first spacing intracavity with the detachable mode, first filter screen support and first enclosing cover are connected.

Further, in order to facilitate the second air curtain assembly to blow air upwards, the second air curtain assembly comprises a second shell, the second shell is in a hollow elongated shape, extends in the left-right direction and is arranged at the front end of the bottom in the shell, the top of the second shell is in fluid communication with the single-fan balance assembly, the bottom of the second shell is opened to form a second air outlet for blowing air out, and the second air outlet is in fluid communication with the outside of the shell.

Preferably, the bottom of the housing is further provided with an oil cup, the bottom of the housing is open at a position corresponding to the second air outlet, so that the second air outlet is communicated with the fluid in the oil cup, the front side of the oil cup is located at the front side of the panel assembly, and an air guide channel for guiding air flow is formed between the front side of the oil cup and the front side of the panel assembly.

Further, for being convenient for discharge and filter before indoor at the air, avoid influencing indoor environment and user, second air curtain subassembly still includes the second enclosing cover and sets up the second filter screen subassembly in the second shell, second shell rear side opening, the rear side at the second shell is established to the second enclosing cover lid, second filter screen subassembly includes second filter screen and second filter screen support, the spacing chamber of second has been seted up at the top of second filter screen support, the spacing intracavity of second that the second filter screen inserted second filter screen support with the detachable mode, second filter screen support and second enclosing cover are connected.

Compared with the prior art, the invention has the advantages that: the balance device is arranged to form a downward upper air curtain and an upward lower air curtain, an airflow barrier is formed under the action of the upper air curtain and the lower air curtain, the airflow barrier interacts with the suspension baffle plate to effectively guide airflow to be sucked into the range hood without escaping outwards, the fume suction effect is greatly improved, the air resistance is effectively reduced, the rest upper air curtain and the rest lower air curtain enter the room to realize airflow supplement and balance, the defects of fume leakage or sudden drop of indoor temperature during cooking of northern families are effectively overcome, and the indoor and outdoor pressure balance can be realized without opening windows in the cooking process; the fan system is unique, a double-cavity volute is designed, the power system is unique, double actions of oil smoke extraction and air suction of double impellers are completed by output shafting from two ends of a main motor, the efficiency is high, and the cost is lower; the double-flow air outlet cover is designed, the structure is simple and compact, and the adaptability with the cabinet is high; two sets of filter screens will outdoor muddy air purification and play and fall the effect of making an uproar to the filter screen can independently be dismantled with the magnetism mode of inhaling, and the user can carry out cleanness and change according to the in service behavior, easy operation, convenient and fast make the air purification efficiency who gets into high.

Drawings

FIG. 1 is a schematic view of a range hood according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a range hood in accordance with an embodiment of the present invention;

FIG. 3 is a schematic view of a hidden casing of the range hood according to the embodiment of the present invention;

fig. 4 is a schematic view of a single fan balance assembly of the balance device of the range hood according to the embodiment of the present invention;

fig. 5 is a schematic view of an impeller and a motor of a single fan balance assembly of a balancing device of a range hood according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of a volute of a single fan balance assembly of the balancing device of the range hood according to the embodiment of the present invention;

fig. 7 is a schematic view of a diversion pipeline of a single fan balance assembly of a balancing device of a range hood according to an embodiment of the present invention;

fig. 8 is a schematic view of an air outlet cover of the range hood according to the embodiment of the present invention;

fig. 9 is a cross-sectional view of the first air curtain assembly of the balancing device of the range hood according to the embodiment of the present invention;

fig. 10 is an exploded schematic view of a first air curtain assembly of the balancing device of the range hood according to the embodiment of the present invention;

fig. 11 is a sectional view of a second air curtain assembly of the balancing device of the range hood according to the embodiment of the present invention;

fig. 12 is an exploded schematic view of a second air curtain assembly of the balancing device of the range hood according to the embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1 and 2, a range hood is a side-draft range hood, and includes a housing 1 and a panel assembly 2 disposed at a front side of the housing 1, the panel assembly 2 is provided with an air inlet 21, the panel assembly 2 includes a panel support 22 and a panel 23 fixedly disposed at a front side of the panel support 22, and the panel 23 is generally made of glass. The front side of the panel component 2 is provided with a smoke baffle 4, the smoke baffle 4 and the air inlet 21 are oppositely arranged at intervals, and the periphery of the smoke baffle 4 completely covers the air inlet 21, so that a suspension baffle structure is formed, and the effect of ring suction is achieved. The top of the shell 1 is provided with an air outlet cover 5, and the bottom of the shell 1 is also provided with an oil cup 6 for collecting condensed oil flowing down from the shell 1 and the panel component 2. The above structure may adopt the prior art.

Referring to fig. 2 and 3, in order to balance indoor and outdoor pressure without opening a window during cooking and improve the effect of oil smoke absorption, the range hood further includes a balancing device, which includes a single fan balancing assembly 71, a first air curtain assembly 72, and a second air curtain assembly 73.

Referring to fig. 3-7, the single fan balance assembly 71 includes a main impeller 711, a main motor 712, a volute 713, a balance impeller 714, a splitter duct 715, and two lock nuts 716. The volute 713 is a dual-cavity volute axially divided into two cavities, a disk 717 is arranged in the volute 713, the volute 713 is divided into two axially independent cavities including a first cavity 7131 close to the air inlet 21 and a second cavity 7132 far away from the air inlet 21, and the first cavity 7131 is located on the front side of the second cavity 7132. Main motor 712 is mounted in volute 713, main motor 712 can be fixed with disk 717, and main motor 717 is a dual output shaft motor. The main impeller 711 is mounted in the volute 713 axially on one of the sides of the disk 717 (in the first cavity 7131) and is connected to one of the output shafts of the main motor 712 by one of the retaining nuts 716, and the balance impeller 714 is mounted in the volute 713 axially on the other side of the disk 717 (in the second cavity 7132) and is connected to the other output shaft of the main motor 712 by the other retaining nut 716. The main impeller 711 and the balance impeller 714 are both driven by the main motor 712. The main impeller 711, the main motor 712 and the volute 713 form a fan system of a range hood in a general sense, and are used for sucking oil smoke into the housing 1 from the air inlet 21 and discharging the oil smoke through the air outlet housing 5. A blower inlet 7136 is formed at the front end of the first cavity 7131 of the scroll 713, and the blower inlet 7136 is opposite to the inlet 21, so that the inlet 21 is in fluid communication with the first cavity 7131 of the scroll 713. Similar to the prior art, a screen may be provided at the intake vent 21, and an oil deflector may be provided between the panel assembly 2 and the volute 713. At the outlet of the volute 713, a fan outlet 7134 (corresponding to the first cavity 7131) and a curtain inlet 7135 (corresponding to the second cavity 7132) are respectively formed by being divided by the wheel disc 717, the fan outlet 7134 is used for discharging the sucked oil smoke to the air outlet cover 5, and the curtain inlet 7135 is used for introducing the fresh air from the outside into the second cavity 7132 through the air outlet cover 5.

The rear end of the second cavity 7132 of the volute 713 is provided with an air curtain outlet 7133, and the diversion pipeline 715 is arranged at the rear part of the volute 713 and corresponds to the air curtain outlet 7133. The flow dividing pipe 715 includes a flow guiding cover 7151, a flow dividing pipe 7152 and a connecting pipe 7153, wherein the flow guiding cover 7151 is in a substantially spherical crown shape, an opening side of the flow guiding cover 7151 covers the air curtain outlet 7133, the flow dividing pipe 7152 extends up and down, and the connecting pipe 7153 is connected between the flow guiding cover 7151 and the flow dividing pipe 7152, so that the flow guiding cover 7151 and the flow dividing pipe 7152 are in fluid communication, and fresh air exhausted from the air curtain outlet 7133 can flow to the flow dividing pipe 7152.

Referring to fig. 8, since the volute 713 is a dual-chamber volute, a partition 51 is disposed inside the wind outlet housing 5 to make the wind outlet housing 5 a dual-chamber housing 51, and each chamber of the wind outlet housing 5 corresponds to one of the chambers of the volute 713. One cavity of the air outlet cover 5 corresponds to the fan air outlet 7134, and the other cavity corresponds to the air curtain air inlet 7135.

Referring to fig. 2, 3, 9 and 10, the first air curtain assembly 72 includes a first coupler 721, a first housing 722 and a first outer cover 723. The first housing 722 is formed in a hollow elongated shape extending in the left-right direction and is provided at the top front end of the housing 1, and the rear side of the first housing 722 is connected to the upper end of the shunt tube 7152 through the first coupler 721 to be in fluid communication therewith. The first housing 722 is open at the top, and a first outer cover 723 is provided on the top of the first housing 722. First air curtain subassembly 72 still includes the first filter screen subassembly 724 who sets up in first shell 722, first filter screen subassembly 724 includes first filter screen 7241 and first filter screen support 7242, first filter screen 7241 can include that 3D front net is two-layer with the filter pulp net, first filter screen support 7242 is hollow rectangular shape equally, extend in left and right directions, first spacing chamber 7243 has been seted up to first filter screen support 7242's rear portion, with the inside intercommunication of first filter screen support 7242, first filter screen 7241 inserts in first spacing chamber 7243 of first filter screen support 7242 with removable mode. The first air curtain assembly 72 further includes a first positioning magnetic fastener 725, the first positioning magnetic fastener 725 is located on a side of the first screen support 7242 away from the first outer cover 723, so as to magnetically attract the first outer cover 723, so as to fix the first screen assembly 724 in the first housing 722, and the first screen support 7242 and the first outer cover 723 may be fixedly connected or detachably connected in other manners. This connection makes it very convenient to replace the first screen 7241.

The first housing 722 is formed at a front end portion with a first cover plate 7221 and a second cover plate 7222 bent downward, the first cover plate 7221 is disposed at a front side of the second cover plate 7222 at an interval, so that a first air outlet 726 is formed at a lower end opening of the first cover plate 7221 and the second cover plate 7222.

Referring to fig. 2, 3, 11 and 12, the second air curtain assembly 73 includes a second coupler 731, a second housing 732 and a second cover 733. The second housing 732, which has a hollow elongated shape and extends in the left and right directions, is disposed at the bottom front end inside the housing 1, and the top of the second housing 732 is connected to and fluidly communicated with the lower end of the shunt tube 7152 through a second coupling 731. The second housing 732 is open at the rear side, and a second cover 733 is provided at the rear side of the second housing 732. Second air curtain assembly 73 also includes a second screen assembly 734 disposed in second housing 732, second screen assembly 734 includes a second screen 7341 and a second screen support 7342, second screen 7241 may include two layers of 3D front screen and filter cotton screen, second screen support 7342 is also hollow and elongated and extends in the left-right direction, a second spacing cavity 7343 is opened at the top of second screen support 7342 and communicates with the inside of second screen support 7342, and second screen 7341 is detachably inserted into second spacing cavity 7343 of second screen support 7342. The second air curtain assembly 73 further includes a second positioning magnetic fastener 735, the second positioning magnetic fastener 735 is located at a side of the second screen support 7342 away from the second external cover 733, so as to magnetically attract the second external cover 733, and fix the second screen assembly 734 in the second housing 732, and the second screen support 7342 and the second external cover 733 may be fixedly connected or detachably connected in other manners. This connection facilitates replacement of the second filter mesh 7341.

The second housing 732 has a bottom opened at a front end thereof to form a second outlet 736. The bottom of the casing 1 is open at a position corresponding to the second air outlet 736, so that the second air outlet 736 is communicated with the fluid in the oil cup 6. The front side of the oil cup 6 is located in front of the panel 23, and the front side of the oil cup 6 and the panel 23 are spaced apart from each other to form a wind guide channel 737, so that the second wind outlet 736 is in fluid communication with the outside of the casing 1.

When the range hood works, the main motor 712 works to drive the main impeller 711 to rotate clockwise (or anticlockwise) at a high speed, oil smoke is sucked into the first cavity 7131 of the volute 713, is discharged to the air outlet cover 5 through the fan air outlet 7134, and is discharged to the outside through a smoke discharge pipe connected with the air outlet cover 5. Meanwhile, the main motor 712 drives the balance impeller 714 to rotate at a high speed counterclockwise (or clockwise, which is opposite to the rotation direction of the main impeller 711), so that outdoor fresh air is sucked into the air outlet housing 5 and enters the second cavity 7132 of the scroll 713 through the air curtain air inlet 7135, and airflow collected in the second cavity 7132 passes through the air curtain air outlet 7133 and then enters the first housing 722 and the second housing 732 through the first coupling 721 and the second coupling 731 respectively through the diversion pipeline 715.

The air flow entering the first housing 722 of the first air curtain assembly 72 flows forward, purifies the sucked air through the first filter screen 7141, and sinks along the surface of the panel 23 after being discharged through the first air outlet 726 to form an upper air curtain; the air flow entering the second housing 732 of the second air curtain assembly 73 flows downward, purifies the sucked air through the second filter screen 7241, and rises along the surface of the panel 23 through the second air outlet 736 and the air guide channel 737 to form a lower air curtain; when oil smoke is generated, the hot air of the lower air curtain guides the oil smoke to enter the lower edge of the smoke baffle 4 and is sucked into the first cavity 7131 of the volute 713 of the range hood, the cold air of the upper air curtain guides the rising oil smoke to enter the upper edge of the smoke baffle 4 and is sucked into the first cavity 7131 of the volute 713 of the range hood, and an air flow barrier is formed under the action of the upper air curtain and the lower air curtain, so that the oil smoke is guided in at an accelerated speed and does not escape outwards. The upper air curtain and the lower air curtain form an airflow barrier, the part of the airflow barrier sucked by the fan system occupies a small part of the upper air curtain and the lower air curtain, and the rest part of the airflow barrier enters the room to realize airflow supplement and balance.

In the process, the fan system of the range hood continuously extracts air polluted by oil smoke from the indoor, and the balancing device 7 continuously feeds fresh air from the outdoor for supplement, so that indoor air pressure balance is formed.

The term "fluid communication" as used herein refers to a spatial relationship between two components or portions (hereinafter collectively referred to as a first portion and a second portion, respectively), i.e., a fluid (gas, liquid or a mixture of both) can flow along a flow path from the first portion and/or be transported to the second portion, and may be a direct communication between the first portion and the second portion, or an indirect communication between the first portion and the second portion via at least one third element, such as a fluid channel, e.g., a pipe, a channel, a duct, a flow guide, a hole, a groove, or a chamber that allows a fluid to flow through, or a combination thereof.

Claims (11)

1. The utility model provides a range hood, includes casing (1) and panel components (2) of setting in casing (1) front side, air intake (21) have been seted up on panel components (2), the front side of panel components (2) is provided with keeps off cigarette board (4), keep off cigarette board (4) and air intake (21) interval ground mutual disposition and form the structure of suspension baffle, its characterized in that: the range hood further comprises a balancing device, the balancing device comprises a single-fan balancing component (71) which can suck oil smoke into the range hood and discharge the oil smoke out of the range hood and suck fresh air, a first air curtain component (72) which blows air introduced by the single-fan balancing component (71) from the top end of the panel component (2) to the direction of the smoke baffle (4) to form an upper air curtain, and a second air curtain component (73) which blows air introduced by the single-fan balancing component (71) from the bottom end of the panel component (2) to the direction of the smoke baffle (4) to form a lower air curtain.

2. The range hood of claim 1, wherein: the single fan balance assembly (71) comprises a main impeller (711), a main motor (712), a volute (713) and a balance impeller (714), wherein the volute (713) is axially divided into a first cavity (7131) and a second cavity (7132), the first cavity (7131) is located on the front side, the second cavity (7132) is located on the rear side, the main impeller (711) is located in the first cavity (7131), the balance impeller (714) is located in the second cavity (7132), the main motor (712) is arranged in the volute (713) and can drive the main impeller (711) and the balance impeller (714) simultaneously, so that the main impeller (711) can suck and discharge oil smoke into and out of the range hood, and the balance impeller (714) can suck fresh air.

3. The range hood of claim 2, wherein: a disk (717) is arranged in the volute (713) to divide the volute (713) into two cavities which are independent in the axial direction, and the main motor (712) penetrates through the disk (717) and is fixed.

4. The range hood of claim 2, wherein: the front end of a first cavity (7131) of the volute (713) is provided with a fan air inlet (7136), the fan air inlet (7136) is opposite to the air inlet (21), the rear end of a second cavity (7132) of the volute (713) is provided with an air curtain air outlet (7133) which enables the second cavity (7132) to be respectively communicated with the first air curtain component (72) and the second air curtain component (73), and an outlet of the volute (713) is respectively provided with a fan air outlet (7134) corresponding to the first cavity (7131) and an air curtain air inlet (7135) corresponding to the second cavity (7132).

5. The range hood of claim 4, wherein: an air outlet cover (5) is arranged at an outlet of the volute (713), and the air outlet cover (5) is a double-cavity cover body matched with the volute (713).

6. The range hood of claim 4, wherein: the balanced subassembly of single fan (71) still includes reposition of redundant personnel pipeline (715), reposition of redundant personnel pipeline (715) include drainage cover (7151), shunt tubes (7152) of being connected with drainage cover (7151), the opening side cover of drainage cover (7151) is on air curtain air outlet (7133), the one end and the first air curtain subassembly (72) of shunt tubes (7152) are connected and make drainage cover (7151) and second air curtain subassembly (73) fluid intercommunication, the other end and the second air curtain subassembly (73) of shunt tubes (7152) are connected and make drainage cover (7151) and second air curtain subassembly (73) fluid intercommunication.

7. The range hood of claim 1, wherein: the first air curtain assembly (72) comprises a first shell (722), the first shell (722) is in a hollow elongated shape, extends in the left-right direction and is arranged at the front end of the top of the shell (1), the rear side of the first shell (722) is communicated with the single fan balance assembly (71) in a fluid mode, and the front end part of the first shell (722) located at the front side of the panel assembly (2) forms a first air outlet (726) blowing downwards.

8. The range hood of claim 7, wherein: first air curtain subassembly (72) still include first enclosing cover (723) and set up first filter screen subassembly (724) in first shell (722), first shell (722) upper shed, first enclosing cover (723) lid is established at the top of first shell (722), first filter screen subassembly (724) includes first filter screen (7241) and first filter screen support (7242), first spacing chamber (7243) has been seted up to the rear portion of first filter screen support (7242), first filter screen (7241) are in first spacing chamber (7243) of detachable mode insertion, first filter screen support (7242) and first enclosing cover (723) are connected.

9. The range hood of claim 1, wherein: the second air curtain component (73) comprises a second shell (732), the second shell (732) is in a hollow long strip shape, extends in the left-right direction and is arranged at the front end of the bottom in the shell (1), the top of the second shell (732) is in fluid communication with the single fan balance component (71), the bottom of the second shell (732) is opened to form a second air outlet (736) for blowing air out, and the second air outlet (736) is in fluid communication with the outside of the shell (1).

10. The range hood of claim 9, wherein: the bottom of casing (1) still is provided with oil cup (6), the position opening that casing (1) bottom and second air outlet (736) correspond for second air outlet (736) and interior fluid communication of oil cup (6), the front side of oil cup (6) is located panel components (2) front side, form air ducting channel (737) of guide air current between the front side of oil cup (6) and the front side of panel components (2).

11. The range hood of claim 9, wherein: the second air curtain assembly (73) further comprises a second outer cover (733) and a second filter screen assembly (734) arranged in the second shell (732), the rear side of the second shell (732) is open, the second outer cover (733) is covered on the rear side of the second shell (732), the second filter screen assembly (734) comprises a second filter screen (7341) and a second filter screen support (7342), a second limiting cavity (7343) is formed in the top of the second filter screen support (7342), the second filter screen (7341) is detachably inserted into the second limiting cavity (7343) of the second filter screen support (7342), and the second filter screen support (7342) and the second outer cover (733) are connected.

Images