CN111609440A

CN111609440A - Air outlet device and internal circulation range hood with same

Info

Publication number: CN111609440A
Application number: CN201910139782.XA
Authority: CN
Inventors: 徐志能; 蔡帆
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2019-02-26
Filing date: 2019-02-26
Publication date: 2020-09-01
Anticipated expiration: 2039-02-26
Also published as: CN111609440B

Abstract

The invention discloses an air outlet device, which comprises a hollow decorative cover and is characterized in that: the air guide plate comprises a top plate, the left side, the right side and the front side of the top plate are respectively tightly attached to corresponding positions of the decoration cover, the top plate gradually inclines upwards from back to front, an air outlet is formed in the decoration cover, and the top end of the air outlet is not higher than the top plate. Also discloses an internal circulation range hood with the air outlet device. By arranging the air guide plate which inclines upwards, the air flow from the bottom of the decorative cover can start to flow forwards along the inclined plane from the contact point of the air guide plate, so that the air flow is prevented from flowing backwards and impacting a back wall to form larger wind resistance noise.

Description

Air outlet device and internal circulation range hood with same

Technical Field

The invention relates to an oil fume purification device, in particular to an air outlet device and an internal circulation range hood applying the air outlet device.

Background

The range hood has become one of the indispensable kitchen household electrical appliances in modern families. According to the oil fume discharge mode, the range hood can be divided into an external exhaust type and an internal circulation type. The current internal circulation range hood mainly sucks oil smoke and air through a fan system, the oil smoke and the air are adsorbed and filtered through a filtering system in the whole machine, and the purified air is discharged into a room.

Referring to fig. 6, a box-shaped air guide box 2 'is disposed above the air outlet of the internal circulation range hood 1', the air guide box 2 'is fixed on the back wall, and the lower end of the air guide box 2' is provided with a circular hole and is connected to the air outlet of the internal circulation range hood 1 'through a connecting pipe 3'. The left and right sides of the air guide box body 2 ' are air outlet areas which are opposite to the air outlet holes 41 ' on the decorative cover 4 '. The air filtered by the internal circulation range hood 1 'is blown out from the air outlet cover 11', passes through the connecting pipe 3 ', is divided into a left beam and a right beam in the air guide box body 2', and is exhausted through the exhaust hole 41 'of the decorative cover 4'.

The existing box type wind guide box body 2 ' utilizes the principle of a right-angle tee joint, when the wind at the wind outlet goes upwards, a right-angle turning phenomenon exists in the box type wind guide box body 2 ', meanwhile, the space structure in the wind guide box body 2 ' is limited, so that the wind outlet resistance in the connecting pipe 3 ' is large, and the local noise is formed at the upper top in the wind guide box body 2 ' of the direct blowing box; in addition, although left-right air outlet is set, because the air speed is high, airflow refraction is actually formed at the upper top part in the air guide box body 2', the phenomenon of downward air filling exists, the user experience is influenced, and meanwhile, turbulent interference is formed on the cooking stove for open fire cooking; meanwhile, the air outlet channels are easily blocked due to the undersize transverse air outlet areas on the left side and the right side, the air exhaust resistance of the fan system is increased, and the noise is also increased.

Disclosure of Invention

The first technical problem to be solved by the present invention is to provide an air outlet device, which aims to solve the problems of the prior art, reduce wind resistance, prevent the problems of unsmooth air outlet and turbulent air outlet, guide the discharged air, and prevent the quick settlement of the front outlet from interfering with the operation of a user.

The second technical problem to be solved by the invention is to provide an internal circulation range hood with the air outlet device.

The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides an air-out device, includes hollow decoration cover, its characterized in that: the air guide plate comprises a top plate, the left side, the right side and the front side of the top plate are respectively tightly attached to corresponding positions of the decoration cover, the top plate gradually inclines upwards from back to front, an air outlet is formed in the decoration cover, and the top end of the air outlet is not higher than the top plate.

In order to facilitate the installation of the air outlet device and an external installation base body, the air deflector further comprises a rear side plate which is arranged below the rear end of the top plate and used for being connected and fixed with the external installation base body.

In order to facilitate connection of the decoration cover and the air guide plate, the decoration cover comprises a left side wall and a right side wall, hanging parts bent inwards are arranged at the top ends of the left side wall and the right side wall respectively, hanging plates extending upwards are arranged on the left side and the right side of the top plate respectively, and the hanging parts are hung on the hanging plates so that the decoration cover is hung on the air guide plate.

In order to facilitate the discharge of oil smoke gas flow and filter the discharged oil smoke gas flow, the decoration cover comprises a front side wall, the air outlet on the decoration cover comprises a front air outlet arranged on the upper part of the front side wall of the decoration cover, and a front filter is arranged at the position of the front air outlet.

Preferably, the front filter comprises a filter grille, and the filter grille is arranged on the front side of the front air outlet and is tightly attached to the front side wall of the decorative cover.

In order to effectively guide part of air discharged from a fan system upwards obliquely and make the air flow move in a slightly upward parabolic manner, and prevent a front air outlet from quickly settling to interfere with the operation of a user, the filtering grille comprises a plurality of grilles, each grille is arranged in the longitudinal direction, the lower end of each grille is provided with a guide wall, the guide wall extends forwards from the lower end of the grille, and the upper surface of the guide wall gradually extends upwards obliquely from back to front.

In order to ensure that the width of the channel is not changed when the gas flows out, thereby reducing unnecessary energy loss generated by the structural shape to the fluid flow, the upper surface of the flow guide wall is parallel to the top plate of the air deflector.

In order to supplement and filter the airflow guided out forwards by the air deflector and adjust the wind speed of the front outlet, the wind speed is homogenized and effectively reduced, so that the noise at the front air outlet is reduced, the front filter also comprises a front filter screen arranged at the rear side of the filter grille, and the front filter screen penetrates through the front air outlet and is partially arranged in the decorative cover.

In order to facilitate the discharge of oil smoke gas flow and filter the discharged oil smoke gas flow, the decoration cover comprises a left side wall and a right side wall, the air outlet on the decoration cover further comprises a side air outlet arranged on the upper part of the left side wall and/or the right side wall of the decoration cover, and a side filter is arranged outside the side air outlet.

In order to effectively release wind pressure formed by the back wall and the upper part of the wind deflector, eliminate the phenomenon of wind speed reduction caused by unsmooth air outlet when the airflow impacts the side wall, and further avoid turbulent flow formed by impacting the side surface of the cabinet to two sides of the airflow when the cabinet exists, eliminate pressure loss generated by the airflow due to change of the flow direction, enable air exhaust to be smoother, avoid residual odor impurities from rapidly settling and blowing to the position near the head of a cook, and simultaneously reduce the attached pollution of the residual odor impurities to the ceiling, a plurality of through holes are formed in the upper part of the left side wall and/or the right side wall of the decorative cover, the through holes are arranged at intervals in the front and rear direction, a bending part which is formed by the front end and gradually and arcuately extends towards the inner part of the decorative cover is arranged in each through hole, the side air outlet is formed between the rear end of the bending part and the rear end of the, The front end contour line is a straight line, the adjacent part of the bending part and the front end contour line of the through hole is in smooth transition, the cross section of the bending part is in a circular arc shape, a transversely extending middle plane S of the bending part is perpendicular to the front end contour line and is parallel to a top plate of the air deflector, and the midpoint connecting lines of the front end contour lines of the through holes are a straight line.

In order to make the gas flowing out from the side air outlet facing the filter medium to the maximum extent, improve the filtering efficiency and reduce the flow direction interference generated to the gas flow, the side filter is an equidistant corrugated filter screen, the ridge line of the corrugated filter screen is parallel to the front end contour line, and a side air outlet is covered between two corrugations of the side filter screen which are contacted with the decorative cover.

The technical scheme adopted by the invention for solving the second technical problem is as follows: the utility model provides an use inner loop range hood as above air-out device, includes the range hood main part, the range hood main part includes fan dustcoat and sets up the fan system in the fan dustcoat, its characterized in that: the bottom of the decorative cover of the air outlet device is connected with the top of the fan outer cover of the range hood main body, so that oil smoke flows into the air outlet device from the bottom of the decorative cover.

In order to form an effective air exhaust buffer zone, the mounting base body for mounting the air guide plate is a back wall, the decorative cover is in a U shape with a rear opening, the opening part of the decorative cover can be tightly attached to the back wall, and a buffer space is formed among the decorative cover, the air guide plate, the top of the fan outer cover of the range hood main body and the back wall.

In order to avoid leakage of oil fume, the bottom of the decorative cover of the air outlet device is nested in the fan outer cover and is compressed.

Compared with the prior art, the invention has the advantages that: 1. by arranging the air guide plate which inclines upwards, the air flow from the bottom of the decorative cover can start to flow forwards along the inclined plane from the contact point of the air guide plate, so that the phenomenon that the air flow flows backwards and impacts a back wall to form larger wind resistance is avoided; 2. meanwhile, due to the structure that the air deflector is inclined upwards, the air flow is reduced to flow towards the back wall, a large amount of air flow is promoted to flow forwards, the pressure at the junction of the back wall and the inner top surface is effectively released by combining the structure of the arc-shaped side hole bent inwards on the decorative cover, the air direction is always kept in a reasonable flowing direction, and the wind resistance and the wind noise are obviously reduced; 3. the installation of the decorative cover can be finished only by connecting the rear part of the air deflector with the back wall and then hanging the decorative cover on the air deflector, the installation is very convenient, and meanwhile, the height of the decorative cover is integrally and conveniently adjusted up and down along with the installation height of the air deflector; 4. The filtering grids arranged at the front air outlet can effectively guide the air obliquely upwards to enable the air flow to move in a slightly upward parabolic manner, so that the front air outlet is prevented from fast settling to interfere with the operation of a user; 5. the arc-shaped and inclined upward air outlet structure which is bent inwards on the decorative cover can effectively discharge the sub-air obliquely forwards after the sub-air is guided at the two sides of the decorative cover, thereby not only effectively releasing the air pressure formed by the back wall and the upper part of the air deflector, eliminating the phenomenon that the air speed is reduced due to unsmooth air outlet when the air flow impacts the side wall, but also avoiding the turbulent flow formed by the air flow impacting the side surface of the cabinet towards the two sides when the cabinet exists; the upward flow direction is parallel to the top plate of the air deflector, so that the upper part of the air flow inside and outside the decorative cover is in a relatively parallel state, the pressure loss caused by the change of the flow direction of the air flow is eliminated, the air exhaust is smoother, meanwhile, the upward flow direction air flow is sprayed out from the side air outlet and then is combined with the gravity action of the air flow, so that the air flow is in a certain arc shape above the kitchen, the residual odor and impurities are prevented from rapidly settling and blowing to the position near the head of a cooker, meanwhile, the arc-shaped flow direction is prevented from violently and directly blowing the ceiling, and the attached pollution of the residual odor and impurities to the ceiling is also reduced; 6. the filter screens are arranged at the front air outlet and the side air outlet of the decorative cover, so that blown air flow is effectively supplemented and filtered again, and the filtering efficiency of the whole machine is improved; 7. the air outlet device does not make hard connection with the outlet of the fan system of the range hood, so the air outlet scheme can adapt to the air outlets of the fan systems with various shapes; 8. through the great surrounding structure that aviation baffle, decoration cover, back wall, range hood top surface have constituteed, the air-out can fully buffer treatment in this surrounding structure among the fan system, has fully effectively reduced wind pressure and wind speed to guaranteed just getting into the lampblack absorber system and treating that filtered gas is at filter medium dwell time, increased the filtration reaction chance, improved the filter effect.

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 an internal circulation air outlet device according to an embodiment of the present invention;

fig. 4 is a sectional view of an internal circulation air outlet device according to an embodiment of the present invention;

FIG. 5 is a cross-sectional view taken along line K-K of FIG. 4;

fig. 6 is a schematic diagram of a range hood in the prior art.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

Referring to fig. 1 to 5, an internal circulation range hood includes a range hood main body 1 and an air outlet device 2, the back surface of the range hood main body 1 is fixedly connected to a back wall 100, the range hood main body 1 includes a fume collecting hood 11, a fan housing 12 disposed above the fume collecting hood 11, and a fan system 13 disposed in the fan housing 12, and the air outlet device 2 is disposed above an air outlet at the top of the fan housing 12 of the range hood main body 1.

The air outlet device 2 comprises a hollow decoration cover 21, an air deflector 22, a front filter 23 and a side filter 24. The decoration cover 21 includes a left side wall 211, a right side wall 212, and a front side wall 213 connected between front ends of the left side wall 211 and the right side wall 212, the left side wall 211 and the right side wall 212 are disposed opposite to each other, preferably in parallel, to form a U-shape with a rear opening, rear ends of the left side wall 211 and the right side wall 212 are respectively attached to the back wall 100 (i.e., the opening of the decoration cover 21 is attached to the back wall 100), and the front side wall 213 is parallel to the back wall 100. The top ends of the left and

right side walls

211 and 212 are respectively provided with hanging parts 214 bent inward so as to be connected with the air deflector 22 to mount the trim cover 21. The front filter 23 is provided on the front sidewall 213, and the side filter 24 includes two, which are provided on the left sidewall 211 and the right sidewall 212, respectively.

The bottom of the decorative cover 21 is open and connected with the top of the fan housing 12 of the range hood main body 1, so that the oil smoke gas flow can enter from the bottom of the decorative cover 21. The length (left-right direction size), the width (fore-and-aft direction size) of the fan dustcoat 12 of range hood main part 1 slightly are greater than decorate the cover 21 for the bottom of decorating the cover 21 can nest in fan dustcoat 12, compress tightly through fan dustcoat 12 and make and decorate cover 21 and range hood main part 1 top trilateral and lean on tightly, avoid getting into the oily flue gas stream leakage in decorating the cover 21 from fan dustcoat 12.

The air deflector 22 is disposed in the top of the trim cover 21 and includes a top plate 221 and a rear side plate 222 disposed below the rear end of the top plate 221, so that the air deflector 22 is substantially L-shaped as a whole, and the top plate 221 and the rear side plate 222 can be integrally formed. The rear side plate 222 is flat and plate-shaped and can be fixed on the back wall 100 right above the range hood body 1 through screws, the top plate 221 extends out in a cantilever shape from back to front, and the top plate 221 gradually inclines upwards from back to front, so that a certain included angle theta is formed between the top plate 221 and the back wall 100 (in the vertical direction), and the included angle theta is preferably greater than or equal to 90 degrees and less than or equal to 125 degrees.

In order to facilitate the connection between the trim cover 21 and the air guide plate 22, the top plate 221 is provided with hanging plates 223 extending upward on the left and right sides thereof, respectively. The hanging portion 214 of the trim cover 21 is hung on the hanging plate 223 of the air guide plate 22, so that the top of the trim cover 21 is hung on the air guide plate 22, and the left, right, and front sides of the top plate 221 are respectively attached to the corresponding positions of the trim cover 21.

Because the outlet of the fan system of the common range hood basically exhausts air upwards, if the fan system directly blows to a ceiling or is arranged in a box-type air outlet system, airflow spreads around by taking a contact point as a center, a large wind resistance is formed on the inner top surfaces of a back wall and the ceiling or the back wall and the box-type air outlet system, and the wind speed surpasses other positions at the junction of the ceiling and the back wall due to the blocking effect of the back wall (or the back of the box-type air outlet system). Therefore, in the present invention, the top plate 221 of the air deflector 22 is disposed to be inclined at a certain angle with the vertical direction, and the wind from the outlet of the range hood main body 1 can flow forward along the inclined plane from the contact point with the air deflector 22, so that the wind resistance and the wind speed of the back wall 100 are greatly reduced, and the noise is also significantly reduced along with the reduction of the wind resistance and the reduction of the wind speed. Meanwhile, the top plate 221 structure of the air deflector 22 which inclines upwards enables the front part of the suspension structure formed by the air deflector and the decoration cover 21 to be more stable, the situation that the front end is sagged is avoided, and the air deflector is used as a support of the decoration cover 21 to be more stable. The arrangement of the hanging plate 223 not only provides a supporting contact position for hanging the decoration cover 21, but also enhances the strength and flatness of the top plate 221.

The decoration cover 21 serves as a decoration component, which can serve as an upwardly extending decoration component of the range hood main body 1. Because the decoration cover 21 and the air deflector 22 are connected in a hanging manner, the decoration cover 21 can be hung and mounted by freely selecting the mounting height of the air deflector 221 above the range hood main body 1, and the distance from the top surface of the decoration cover 21 to the bottom of the range hood main body 1 can be adjusted according to the actual situation in the kitchen of a user.

A closed buffer space 215 is formed between the decorative cover 21, the air deflector 22, the top of the fan housing 12 of the range hood body 1 and the back wall 100, and the buffer space 215 is obviously larger than the existing box-type air guide, so that an effective air exhaust buffer area is formed. Meanwhile, the air outlet device 2 is not structurally connected with an air outlet of the fan system 13 in the range hood main body 1, so that the universality of the fan system 13 is greatly improved.

Preferably, a front outlet 2131 is opened in a position near the top of the front sidewall 213 of the trim cover 21, the front outlet 2131 is a main outlet and has a large area, the top end of the front outlet 2131 is not higher than the top plate 221 of the air deflector 22, and the front filter 23 is disposed at the outlet 2131 of the front sidewall 213. The top end of the pre-filter 23 is flush with and engages the front end of the top plate 221 of the air deflector 22. The front filter 23 includes a filter grid 231 and a front filter screen 232, and the airflow blown out from the fan system 13 of the range hood body 1 is guided by the top plate 221 of the air deflector 22, and is filtered by the front filter screen 232 of the front filter 23, and then is just blown out by the filter grid 231.

The filter grill 231 is disposed in front of the outlet 2131 and is in close contact with the front wall 213 of the decorative cover 21. In order to prevent the airflow discharged from the front outlet 2131 from rapidly falling and being blown to the user, the filter grill 231 of the front filter 23 is divided. The filter grill 231 includes a plurality of grills 2311, and the grills 2311 are arranged in a longitudinal line. The lower end of each grille 2311 is provided with a guide wall 2312, the guide wall 2312 extends forwards from the lower end of the grille 2311, the upper surface of the guide wall 2312 extends upwards gradually from back to front, and the upper surface of the guide wall 2312 is parallel to the top plate 221 of the air deflector 22. The purpose of the parallelism is mainly to ensure that the width of the channel does not change when the gas flows outwards, thereby reducing unnecessary energy loss generated by the structural shape to the fluid flow. In this example, the grating 2311 has three, and the guide wall 2312 extends in the front-rear direction by a length of 30 mm.

The front filter 232 is disposed at the rear side of the filter grill 231 and partially disposed in the trim cover 21 through the front outlet 2131. The front filter screen 232 is mainly used for supplementing and filtering the airflow guided out forwards by the air deflector 22, and meanwhile, the wind speed of the front outlet 2131 is adjusted, so that the wind speed is homogenized and effectively reduced, and the noise at the front air outlet 2131 is reduced.

The upper portion, preferably near the top, of the left sidewall 211 and/or the right sidewall 212 of the trim cover 21 is provided with a side filter 24, in this embodiment, the left sidewall 211 and the right sidewall 212 are both provided with side filters 24, the structure of the two side filters 24 is the same, and the side filter 24 provided on the left sidewall 211 is taken as an example below. A plurality of through holes 2111 are formed in the left side wall 211 and are arranged at intervals in the front-rear direction, a bent portion 2112 gradually extending from the front end to the rear end towards the interior of the decorative cover 21 in an arc-shaped bending manner is arranged in each through hole 2111, a side air outlet 2113 is formed between the rear end of the bent portion 2112 and the rear end of the through hole 2111, and the bent portion 2112 and the left side wall 211 can be integrally formed. The top end of the side outlet 2113 is not higher than the ceiling 221 of the air deflector 22, and the side filter 24 is disposed at the side outlet 2113. In molding, first, a material on the left side wall 211 of the trim cover 21 is cut into a plurality of sets to form a blank (contour line) of the through hole 2111, the rear end contour line 21111 of the through hole 2111 is a half-moon-shaped arc line, the front end contour line 21112 is a straight line, the straight front end contour line 21112 is bent into the trim cover 21 as a bending line to form a bent portion 2112, and the bent portion 2112 and the front end contour line 21112 of the through hole 2112 are smoothly transited to each other.

The cross section of the bent portion 2112 is an arc surface, and a middle plane S (an imaginary plane where a center in the longitudinal direction is located) of the bent portion 2112 extending in the transverse direction is perpendicular to the front end contour line 21112 and is parallel to the top plate 221 of the air deflector 22, that is, the middle plane S is inclined upward from the rear direction to the front direction, so that the side outlet 2113 inclined upward is formed. The midpoints of the front end contour lines 21112 of the through holes 2111 are connected to form a straight line. Through the side air outlet 2113 with the structure, after the wall attachment effect is combined, the air flow can effectively flow to the front side and the inclined upward direction along the arc outer surface of the bent part 2112, so that the air pressure formed by the back wall 100 and the upper part of the air deflector 22 is effectively released, the phenomenon of wind speed reduction caused by unsmooth air outlet when the air flow impacts the side wall is eliminated, and the turbulent flow formed by impacting the side surface of the cabinet to two sides by the air flow when the cabinet exists is also avoided. The upward flow direction is parallel to the top plate 221 of the air deflector 22, so that the upper part of the air flow inside and outside the decorative cover 21 is in a relatively parallel state, the pressure loss caused by the change of the flow direction of the air flow is eliminated, and the air exhaust is smoother. Meanwhile, the upward air flow in the side air outlet 2113 is sprayed out and then is combined with the gravity action of the side air outlet to form a certain arc shape above the kitchen, so that the residual odor and impurities are prevented from rapidly settling and blowing to the position near the head of a cooker. Meanwhile, the arc-shaped flow direction avoids violent direct blowing to the ceiling, and the attached pollution of residual odor and impurities to the ceiling is reduced.

The side filter 24 is a corrugated filter net arranged outside the left side wall 211 at an equal distance, the corrugated ridge line 241 is parallel to the front end contour line 21112, and just one side air outlet 2113 is covered between two corrugations contacting the decoration cover 21. The air flow discharged from the side air outlet 2113 may be directed to the surface of the filter screen, so that each air flow discharged from the side air outlet 2113 is filtered again. The blown air flow is blown to a plurality of corrugated surfaces, and blown residual aerosol pollutants can be uniformly shared. The corrugated structure can enable the gas flowing out of the side air outlet 2113 to face the filter medium to the maximum extent, so that the filtering efficiency is improved, and the flow direction interference generated to the gas flow is reduced. At the same time, a filter net made of the same whole piece of filter material as the pre-filter 23 can be used to increase the re-filtering performance.

In this embodiment, the side filter 24 is made of high-efficiency low-resistance HEPA purification filter paper, the filter paper is bent in a corrugated shape and placed in a protective frame, a sliding groove is formed in the decorative cover 21, and the filter paper can be fixed after being pushed into the sliding groove from front to back.

The air outlet device 2 adopting the structure of the invention abandons the mode of an air outlet pipe and does not restrict the shape of an outlet of a fan system. Besides, the front air outlet 2131 and the side air outlet 2113 on the decorative cover 21 are eliminated, so that the air outlet direction can be effectively ensured to be completely controlled by the structure, and the oil smoke gas exhausted from the range hood main body 1 is subjected to wind direction diversion and secondary auxiliary filtration by the front filter 23 and the side filter 24 and then exhausted.

Claims

1. The utility model provides an air-out device, includes that hollow decorates cover (21), its characterized in that: the bottom opening of the decoration cover (21) is used for air inlet, an air deflector (22) is arranged in the top of the decoration cover (21), the air deflector (22) comprises a top plate (221), the left side, the right side and the front side of the top plate (221) are respectively attached to corresponding positions of the decoration cover (21), the top plate (221) is gradually inclined upwards from back to front, an air outlet is formed in the decoration cover (21), and the top end of the air outlet is not higher than the top plate (221).

2. The air outlet device of claim 1, characterized in that: the air deflector (22) further comprises a rear side plate (222) which is arranged below the rear end of the top plate (221) and used for being connected and fixed with an external installation base body.

3. The air outlet device of claim 2, characterized in that: the decorative cover (21) comprises a left side wall (211) and a right side wall (212), wherein the top ends of the left side wall (211) and the right side wall (212) are respectively provided with a hanging part (214) which is bent inwards, the left side and the right side of the top plate (221) are respectively provided with a hanging plate (223) which extends upwards, and the hanging parts (214) are hung on the hanging plates (223) so that the decorative cover (21) is hung on the air guide plate (22).

4. The air outlet device of claim 1, characterized in that: the decoration cover (21) comprises a front side wall (213), the air outlet on the decoration cover (21) comprises a front air outlet (2131) arranged at the upper part of the front side wall (213) of the decoration cover (21), and a front filter (23) is arranged at the position of the front air outlet (2131).

5. The air outlet device of claim 4, characterized in that: the front filter (23) comprises a filter grille (231), and the filter grille (231) is arranged on the front side of the front air outlet (2131) and is tightly attached to the front side wall (213) of the decorative cover (21).

6. The air outlet device of claim 5, characterized in that: the filtering grill (231) includes a plurality of grills (2311), each grill (2311) is arranged in a longitudinal direction, a lower end of each grill (2311) is provided with a guide wall (2312), the guide wall (2312) extends forward from the lower end of the grill (2311), and an upper surface of the guide wall (2312) extends upward with a gradual inclination from back to front.

7. The air outlet device of claim 6, characterized in that: the upper surface of the flow guide wall (2312) is parallel to the top plate (221) of the air guide plate (22).

8. The air outlet device of claim 7, characterized in that: the front filter (23) further comprises a front filter screen (232) arranged on the rear side of the filter grille (231), and the front filter screen (232) penetrates through the front air outlet (2131) and is partially arranged in the decorative cover (21).

9. The air outlet device of claim 1, characterized in that: decorate cover (21) including left side wall (211) and right side wall (212), decorate air outlet on cover (21) still including offering side air outlet (2113) on left side wall (211) and/or right side wall (212) upper portion of decorating cover (21), side air outlet (2113) outside is provided with side filter (24).

10. The air outlet device of claim 9, characterized in that: the upper portion of the left side wall (211) and/or the right side wall (212) of the decorative cover (21) is provided with a plurality of through holes (2111), the through holes (2111) are arranged at intervals in the front-back direction, a bending portion (2112) which extends from the front end to the back end and gradually extends towards the interior of the decorative cover (21) in an arc shape is arranged in each through hole (2111), a side air outlet (2113) is formed between the back end of the bending portion (2112) and the back end of the through hole (2111), the back end contour line (21111) of the through hole (2111) is a half-moon-shaped arc line, the front end contour line (21112) is a straight line, the adjacent position of the bending portion (2112) and the front end contour line (21112) of the through hole (2112) is in smooth transition, the cross section of the bending portion (2112) is in an arc shape, a middle plane S of the transverse extension of the bending portion (2112) is perpendicular to the front end contour line (21112) and is parallel to a top plate (221) of the top plate (22, the connecting lines of the midpoints of the front end contour lines (21112) of the through holes (2111) are straight lines.

11. The air outlet device of claim 10, characterized in that: side filter (24) are the corrugate filter screen of equidistance, and corrugated crest line (241) are parallel with front end profile line (21112), cover a side air outlet (2113) between two flutes of side filter (24) and decoration cover (21) contact.

12. An internal circulation range hood applying the air outlet device of any one of claims 1 to 11, comprising a range hood main body (1), wherein the range hood main body (1) comprises a fan housing (12), and is characterized in that: the bottom of a decorative cover (21) of the air outlet device is connected with the top of a fan outer cover (12) of the range hood main body (1), so that oil smoke flows into the air outlet device from the bottom of the decorative cover (21).

13. The internal circulation range hood of claim 12, wherein: the mounting base body for mounting the air deflector (22) is a back wall (100), the decorative cover (21) is U-shaped with a rear opening, the opening can be tightly attached to the back wall (100), and a buffer space (215) is formed between the top of the fan outer cover (12) of the range hood main body (1), the decorative cover (21), the air deflector (22) and the back wall (100).

14. The internal circulation range hood of claim 12, wherein: the bottom of the decorative cover (21) of the air outlet device is nested in the fan outer cover (12) and is compressed.