CN109780591A - A kind of range hood - Google Patents

Abstract

The invention discloses a kind of range hoods, including exhaust fume collecting hood, cabinet and lampblack filter above exhaust fume collecting hood are set, air inlet is formed on the exhaust fume collecting hood, air duct is formed in the cabinet, the lampblack filter includes the oil network that the air inlet is arranged in, the oil network is integrally in up big and down small, the taper extended downwardly by air inlet, blower fan system is provided in the cabinet, it is characterized by: the blower fan system includes the first ternary blower and the second ternary blower being arranged in series, the lampblack filter further includes being arranged in the cabinet, the rotary sieve of the inlet in air duct.Pass through setting oil network and rotary sieve, oil network can be rectified and be guided to air-flow, rotary sieve is conducive to air-flow and is evenly distributed in air inlet, therefore the two, which combines, can effectively rectify and guidance air-flow, reduce the turbulent flow and sinuous flow in air-flow, smooth air-flow is formed, the whirlpool that air-flow is formed before entering blower fan system is reduced.

Description

A kind of range hood

Technical field

The present invention relates to machine for kitchen use, especially a kind of range hood.

Background technique

Range hood has become one of machine for kitchen use equipment indispensable in Modern Family.Usual range hood includes top Suction and near-absorption type, the principle that the range hood of top suction type utilizes hot gas to rise, suction is generated when cooking to be risen naturally Oil smoke, additionally due to it is clean and tidy light and handy, occupy little space the advantages that, and it is in an increasingly wide range of applications.

Lampblack filter is an important component of range hood, and the technological improvement about lampblack filter is always One hot technology in range hood field.Existing range hood, meeting be to collect the oil smoke generated in cooking, flue dust etc. Purpose and filter screen is installed, a kind of smoke exhaust ventilator as disclosed in the Chinese patent application No. is 201310359754.1, including Oil cleaner screen, swab case and fan assembly are with swab case is arranged below oil cleaner screen, and oil smoke first passes around oil cleaner screen and carries out machinery Formula oil strain, the bulky grain grease filtered out can be fallen into swab case due to gravity；For another example application number 201610642513.1 Chinese patent disclosed in a kind of bionical filter screen on range hood, the cage cigarette of the host lower end of range hood is set At cover, and it is located at the air inlet of lubricating cup upper end, bionical filter screen is up big and down small or up-small and down-big cone or rectangular vertebra Body or the metal thin shell of square centrum.

In recent years, oil network multiple stratification, oil smoke airflow channel are meandering has become a kind of technological trend.Such as application No. is A kind of oil guide structure of novel European type cooker hood disclosed in 201410013980.9 Chinese patent, including outer oil network and positioning The rack being set on the inside of the outer oil network, offered in the outer oil network and rack respectively several perforative first ventilation holes and Third venting hole, and it is all formed with Oil Guide groove on the periphery of several first ventilation holes, the opening of several Oil Guide grooves is all Towards inside range hood, and several Oil Guide grooves also connect to form the dynamic path of a fuel feeding drip, and in outer oil network and Also positioning is provided with the flat interior oil network of muti-piece between rack；For another example application No. is the Chinese patent of 201621013691.X public affairs The compound mesh enclosure of a kind of kitchen ventilator opened, including mesh enclosure ontology, mesh enclosure ontology include side and bottom, and side is integrally formed with a circle The boss of interval setting and ecto-entad protrusion, boss structure in long strip and one end are arranged in side upper end-face edge, the other end Setting constituted oil groove between side lower edge, adjacent two boss of lateral interior surfaces, and gather several mesh at the top of boss.

The vent area of the oil network of these existing multilayers, average each layer of oil network accounts for the ratio of this layer of oil network gross area Maximum does not exceed 50%.And vent area accounts for the ratio of the oil network gross area, will have a direct impact on the smoke evacuation effect of range hood Rate and noise level.And multilayer oil network is only leaned on, enough filterings and rectification can not be played the role of.Therefore, it need It is further improved.

Summary of the invention

The technical problem to be solved by the present invention is in view of the above-mentioned problems of the prior art, providing a kind of raising oil suction Cigarette efficiency, the range hood for reducing noise.

The technical scheme of the invention to solve the technical problem is: a kind of range hood, including exhaust fume collecting hood, setting Cabinet and lampblack filter above exhaust fume collecting hood are formed with air inlet on the exhaust fume collecting hood, are formed with wind in the cabinet Road, the lampblack filter include the oil network that the air inlet is arranged in, the oil network be integrally in it is up big and down small, by entering the wind The taper that extends downwardly at mouthful is provided with blower fan system in the cabinet, it is characterised in that: the blower fan system includes that series connection is set The the first ternary blower and the second ternary blower set, the lampblack filter further include be arranged in the cabinet, air duct The rotary sieve of inlet.

Utmostly to reinforce convenient for carrying out water conservancy diversion to oil smoke so that soot gas smoothly enters range hood The fume-exhausting ability of range hood, and ensure enough incoming air areas, and be avoided that oil droplet directly drops on hearth, it is described Oil network includes internal layer oil network and the outer layer oil network that internal layer oil network periphery is arranged in, and the internal layer oil network includes inner layer net ontology and opens The first ventilation hole being located on inner layer net ontology, the outer layer oil network include outer layer net ontology and are provided on outer layer net ontology Second ventilation hole, first ventilation hole make less than the second ventilation hole, first ventilation hole and the second ventilation hole interlaced arrangement The orthographic projection obtained in same level is partly overlapped.

To reduce the noise that passes through of oil smoke, guarantee enough incoming air areas, and can ensure that preferable filter effect, described the One ventilation hole assumes diamond in shape, and the length of first ventilation hole is 1.0~2.0mm, width is 1.0mm~2.0mm, arbitrary neighborhood two Most short side between a first ventilation hole is away from for 0.3~0.6mm.

It preferably, is the setting convenient for rotary sieve, the rotary sieve includes for the Dropbox of filtering fume excessively and being used for The motor of Dropbox rotation is driven, the output shaft of the motor is inserted into the center of Dropbox and is connected and fixed, and the motor passes through electricity Machine support is connected and fixed with cabinet.

For the rigidity for promoting Dropbox, filter effect is promoted as much as possible, is offered on the surface of the Dropbox along center pair The slot of arc for claiming and being arranged in array, each slot is radially extended along Dropbox, and the slot at least divides along the radial direction of Dropbox It is furnished with two layers.

To make oil smoke with the smallest flow velocity by rotary sieve, the time to contact with each other between the two is longer, to reach To preferable filter effect, the air duct is in diminishing shape from the bottom to top.

To avoid the grease of cabinet and blower from dropping onto below range hood, in the cabinet, it is located at below rotary sieve It is provided with oil drain pan.

For convenient for accepting the grease thrown away along case side wall drippage, blower, the oil drain pan includes disk ontology, the disk The cross-section adaptation of the shape of ontology, size and cabinet, and the edge of disk ontology is located at the lower section of cabinet and extends cabinet Bottom edge and be supported below the air inlet edge of exhaust fume collecting hood.

For convenient for guiding oil smoke air-flow, the intermediate of the disk ontology forms opening, and the disk ontology prolongs upwards in opening It stretches certain distance and forms diversion division, the diversion division is opposite with rotary sieve, and the edge of the rotary sieve exceeds diversion division.

On the basis of not changing Cabinet Size, to increase air quantity, the first ternary blower includes the first 3 d impeller With the first air inlet, the second ternary blower includes the second 3 d impeller and the second air inlet, on oil smoke flow path, institute The downstream that the second air inlet is located at the first air inlet, first air inlet and the second air inlet are stated towards identical direction.

To enable the abundant diffusion of exit flow of first order blower, so that dynamic pressure switchs to static pressure, into second level wind The diameter of machine, the first 3 d impeller and the second 3 d impeller is identical, the distance between first air inlet and the second air inlet With the ratio 0.2~1 of the diameter of the first 3 d impeller.

According to an aspect of the present invention, first air inlet and the second air inlet are downward in horizontal arrangement, institute 1~2 times that the distance between the first air inlet and tunnel inlet of the first ternary blower is the first 3 d impeller diameter is stated, it is described The center of first 3 d impeller is greater than the diameter of the first 3 d impeller at a distance from tunnel inlet.

According to another aspect of the present invention, first air inlet and the second air inlet are obliquely downward in oblique It sets, the vertical range between the first air inlet center of the first ternary blower and the entrance in air duct is the first 3 d impeller 0.5~2 times of diameter.

To promote the flow field of blower and reducing noise, the first air outlet of the first ternary blower and the second ternary blower The second air inlet between pass through guide duct connect.

Compared with the prior art, the advantages of the present invention are as follows: it can be to air-flow by setting oil network and rotary sieve, oil network Rectification and guidance, rotary sieve are conducive to air-flow and are evenly distributed in air inlet, thus the two combine can effectively rectify with Air-flow is guided, turbulent flow and sinuous flow in air-flow are reduced, forms smooth air-flow, reduces the whirlpool that air-flow is formed before entering blower fan system Whirlpool；The oil droplet of intracavitary drippage can be blocked, is made since the ventilation hole of two layers of oil network shifts to install by double-deck oil network of setting Obtaining oil droplet will not directly drop on hearth, by limiting between the arrangement mode of internal layer mesh and the size of mesh, mesh Spacing ensure that the incoming air area of oil network, and outer layer oil network plays guide functions for soot gas, so that soot gas is more smooth Ground enters range hood；Rotary sieve is arranged at the tunnel inlet in cabinet, oil smoke can be made logical with lower flow velocity Rotary sieve is crossed, the time to contact with each other between the two is longer, oil smoke can be made fully to collide with rotary sieve, to reach To preferable filter effect.

Detailed description of the invention

Fig. 1 is the schematic diagram of range hood one embodiment of the invention；

Fig. 2 is the front section view (hiding outlet housing) of the range hood of Fig. 1；

Fig. 3 is the side sectional view of the range hood of Fig. 1；

Fig. 4 is the schematic diagram of the oil network of the range hood of the embodiment of the present invention；

Fig. 5 is the decomposition texture schematic diagram of the oil network of Fig. 4；

Fig. 6 is the schematic diagram of the rotary sieve of the range hood of the embodiment of the present invention；

Fig. 7 is the schematic diagram of the oil drain pan of the range hood of the embodiment of the present invention.

Fig. 8 is the schematic diagram of second embodiment of range hood of the invention；

Fig. 9 is the cross-sectional view of second embodiment of range hood of the invention；

Figure 10 is the schematic diagram of range hood third embodiment of the invention；

Figure 11 is the cross-sectional view of range hood third embodiment of the invention.

Specific embodiment

The present invention will be described in further detail below with reference to the embodiments of the drawings.

Embodiment one

Referring to FIG. 1 to FIG. 3, a kind of range hood, including exhaust fume collecting hood 1, the cabinet 2 being arranged in above exhaust fume collecting hood 1, cabinet 2 Inside it is provided with blower fan system 4.Air inlet 11 is offered on exhaust fume collecting hood 1, the blower fan system 4 in cabinet 2 can aspirate oil smoke as a result, Common flue is discharged into after entering cabinet 2 by air inlet 11.

Air duct 25 is formed in cabinet, air duct 25 is preferably gradually reduced from the bottom to top.

Blower fan system 4 in cabinet 2 uses ternary blower, the prior art can be used, as the applicant application No. is Blower fan structure disclosed in 201620102790.9 patent, the air outlet of blower fan system 4 are provided with outlet housing 5, and being used for will The oil smoke discharge that blower fan system 4 is discharged is to wind pipe.The specific structure of blower fan system 4 will be explained below.

Range hood further includes lampblack filter, in the present embodiment, is filtered using twice, the oil including being located at upstream Net 8 and rotary sieve 6 positioned at downstream.Wherein, rotary sieve 6 is arranged in cabinet 2, positioned at the lower section of blower fan system 4, is located at Bottom in cabinet 2.That is, rotary sieve 6 is arranged in the inlet in above-mentioned air duct 25, and air duct 25 is from the bottom to top gradually It reduces, is then also accelerated without air duct 25 by the oil smoke of rotary sieve 6, at this point, oil smoke passes through rotation filter with the smallest flow velocity Net 6, the time to contact with each other between the two is longer, and oil smoke can be made fully to collide with rotary sieve 6, to reach preferable Filter effect.

The needs of rotary sieve 6 are maintained a certain distance with blower fan system 4, to ensure that oil smoke passes through rotation with lower flow velocity Strainer 6, to fully be filtered, after rotary sieve 6 carries out brokenly whirlpool to oil smoke, so that the flowing that oil smoke passes through certain distance Path side reaches blower fan system 4, to ensure that it is smooth that oil smoke sufficiently achieves；It between the two again cannot be apart from too far, otherwise rotation filter Net 6 will exceed the greatest limit of the negative pressuren zone of blower fan system 4.Structure about rotary sieve 6 will be explained below.

Oil network 8 is then arranged to be set at air inlet 11, and the bottom of oil network 8 is provided with lubricating cup 9.Oil network 8 is whole in up big and down small Taper, extended downwardly by air inlet 11.Referring to fig. 2, Fig. 4 and Fig. 5, oil network 8 include internal layer oil network 81 and are arranged in internal layer The outer layer oil network 82 of 81 periphery of oil network, internal layer oil network 81 and outer layer oil network 82 are in up big and down small taper.

Internal layer oil network 81 includes inner layer net ontology 811 and the first ventilation hole 812 being provided on inner layer net ontology 811, In the present embodiment, the first ventilation hole 812 assumes diamond in shape, the noise generated when reducing oil smoke across internal layer oil network 81, not by size Uniform grease molecules water conservancy diversion is at grease molecules of uniform size, in order to the preferably oil removing of rotary sieve 6 of rear end.Inner layer net The thickness of ontology 81 is preferably 0.3~1mm, the length of the first ventilation hole 812 is 1.0~2.0mm, width (in diagonal line compared with Short one length) be 1.0mm~2.0mm, the most short side between two the first ventilation holes 812 of arbitrary neighborhood away from for 0.3~ Thus 0.6mm both ensure that the incoming air area of internal layer oil network 81, also ensure that preferable filter effect.

Outer layer oil network 82 includes outer layer net ontology 821 and the second ventilation hole 822 being provided on outer layer net ontology 821.Outside Layer net ontology 821 has there are four side wall, is to be in tilted layout, and the water conservancy diversion of four direction can be carried out to oil smoke, so that cooking fume Body smoothly enters range hood, utmostly reinforces the fume-exhausting ability of range hood.Second ventilation hole 822 be it is upper, The rectangle or ellipse of lower extension, width is 6mm~10mm, most short between two the second ventilation holes 822 of arbitrary neighborhood Back gauge is 2mm~5mm.

821 interlaced arrangement of first ventilation hole 811 and the second ventilation hole, i.e. the first ventilation hole 811 and the second ventilation hole 821 exist Orthographic projection in same level is partly overlapped, and forms overlapping portion, and two kinds of ventilation holes is of different sizes, and be staggered part increase Oil smoke traps area, and lap can then block the oil droplet dripped inside range hood, so that oil droplet will not directly drip It falls on hearth.

The oil smoke in negative suction area is first contacted with oil network 8 before entering air intake passage, is attached to bulky grain grease interior In layer oil network 81, prevent bulky grain grease from entering range hood.Oil network 8 is under high-speed flow, superposition and staggered two layers of oil network The separating for several times elaioleucites such as condensation, rectification, shock are formed, oil smoke absorbs cleaner.

Rotary sieve 6 includes the Dropbox 61 for crossing filtering fume and the motor 62 for driving Dropbox 61 to rotate.Referring to fig. 2 And Fig. 6, the slot 611 of the arc along central symmetry and array arrangement is offered on the surface of Dropbox 61, slot 611 is perforation Dropbox 61 Through slot, at least two layers of 611 array of slot radially can be set on the surface of Dropbox 61, since oil smoke is entering draught fan impeller Flue gas is influenced in the concentration distribution of circumference by the revolving speed of blower, the type of impeller and inlet and outlet angular dimensions before, and layering is set After meter, the rigidity of Dropbox 61 is on the one hand improved, it on the other hand, can be dense according to practical flue gas after specific selected blower fan system Distribution character is spent, can more freely be distributed every layer of slot 611 to optimal width dimensions, without the shadow by other layer of slot 611 It rings, as much as possible promotion filter effect.

611 array of slot is arranged to centrosymmetric annular shape, and each slot 611 radially extends, bending direction and arc It spends preferably consistent.By the way that the slot 611 radially extended and with certain radian is arranged, after grease and the contact of Dropbox 61, It can compare and successfully flow from inside to outside, and realize that the grease of higher efficiency is centrifugated after obtaining bigger centrifugal force.

The top of Dropbox 61 is arranged in motor 62, and the output shaft 621 of motor 62 is inserted into the center of Dropbox 61 and company Fixation is connect, thus motor 62 can drive Dropbox 61 to rotate.The arranged on left and right sides of motor 62 passes through electric machine support 622 and cabinet 2 respectively Left side wall and right side wall be connected and fixed, as a result, complete rotary sieve 6 installation.

The bottom end of cabinet 2 extends at the air inlet 11 of exhaust fume collecting hood 1, and sets in cabinet 2, below rotary sieve 6 It is equipped with oil drain pan 7, referring to Fig. 7, oil drain pan 7 includes disk ontology 71 and diversion division 72, shape, size and the cabinet 2 of disk ontology 71 Cross-section adaptation, be arranged in cabinet 2 to horizontal or almost horizontal, and the edge of disk ontology 71 be located at cabinet 2 lower section, And exceeds the bottom edge of cabinet 2 and be supported below 11 edge of air inlet of exhaust fume collecting hood 1.The oil dripped in cabinet 2 as a result, The grease that rouge, blower fan system 4 are thrown away can drop on disk ontology 71.Each side in the air duct 25 of cabinet 2 is inclined, facilitates Oil under blower fan system 4 is got rid of is imported on disk ontology 71.

The intermediate of disk ontology 71 forms opening 711, and disk ontology 71 extends a distance up to form water conservancy diversion at opening 711 The Dropbox 61 of portion 72, diversion division 72 and rotary sieve 6 is opposite, and the cross section of opening 711 and diversion division 72 may be circle, and And the edge of Dropbox 61 can exceed diversion division 72, so that the grease that rotary sieve 6 is thrown away can also drop on disk ontology 71, simultaneously Diversion division 72 also can play the role of water conservancy diversion to the oil smoke entered from exhaust fume collecting hood 1.

Referring back to Fig. 2 and Fig. 3, in the present embodiment, blower fan system 4 include two can independent operation the first ternary blower 41 and the second ternary blower 42, two ternary fans in series settings.It, can be with compared to centrifugal blower by using 3 d impeller Flow efficiency is significantly increased, improves air quantity.

The first 3 d impeller 412 that first ternary blower 41 spiral case 411 and be arranged in the first spiral case 411 including first, The second 3 d impeller 422 that second ternary blower 42 spiral case 421 and be arranged in the second spiral case 421 including second.First spiral case It is formed with the first air inlet 413 on 411, the second air inlet 423, the top shape of the first spiral case 411 are formed on the second spiral case 421 At the first air outlet 414, the top of the second spiral case 421 forms the second air outlet 424.

The prior art can be used in first 3 d impeller 412 and the second 3 d impeller 422, as the applicant application No. is Structure disclosed in 201620102790.9 patent, two 3 d impellers are respectively independent, are respectively provided with independent first and drive Dynamic motor 431 and the second driving motor 432.

First ternary blower 41 (as first order blower) and the second ternary blower 42 (as second level blower) are mutual respectively It is mutually independent, and be in horizontal arrangement, i.e., the air inlet of two ternary blowers is downward.Second ternary blower 42 is located at first The top of ternary blower 41, two ternary blower arranged for interval.When oil smoke enters from exhaust fume collecting hood 1, the first ternary wind is passed sequentially through Machine 41 (upstream of oil smoke flow path) and the second ternary blower 42 (downstream of oil smoke flow path).First ternary blower 41 It is in the first open, i.e., above-mentioned air outlet between first air outlet 414 and the second air inlet 423 of the second ternary blower 42 414 and second are not connected by guide duct between air inlet 423, and oil smoke is directly discharged in cabinet 2 by the first air outlet 414 In air duct 25, the second air inlet 423 sucks oil smoke out of air duct 25 in cabinet 2.

In the present embodiment, the first ternary blower 41 and the second ternary blower 42 are arranged in correspondence with each other, the first ternary blower 41 the first air inlet 413 and the second air inlet 423 of the second ternary blower 42, which can correspond to, (coaxially or same to hang down Histogram is upward), the second air outlet 424 of the second air outlet 414 of the first ternary blower 41 and the second ternary blower 42 can also be with Corresponding (coaxially or in the same vertical direction).It is kept centainly between first air inlet 413 and the second air inlet 423 Distance, distance between the two and the diameter of the first 3 d impeller 412 or the second 3 d impeller 422 (two 3 d impellers are identical) Ratio 0.2~1.Suitable spacing is kept between two-stage blower, enables the abundant diffusion of the exit flow of first order blower, So that dynamic pressure switchs to static pressure, into second level blower；But can not from it is too far, otherwise lose the concatenated meaning of two fans.

First air inlet 413 of the first ternary blower 41 is maintained a certain distance with 25 entrance of air duct, between the two away from From 1~2 times for 412 diameter of the first 3 d impeller, the center of the first 3 d impeller 412 must be big at a distance from 25 entrance of air duct It can just be played a role in the rotary sieve 6 of the diameter of the first 3 d impeller 412, such 25 inlet of air duct, but 2 can not be greater than Times diameter, otherwise apart from negative pressure region apart from too far.

The mode of this arranged in series realizes oil smoke and directly inhales in line, improves static pressure, promote range hood effect；Two Grade blower fan filtering, increases filter effect, improves grease separating degree；Two-stage fans in series, every level-one rotation speed of fan are just not required to It is so high, noise can be effectively reduced.

By setting oil network 8 and rotary sieve 6, oil network 8 can be rectified and be guided to air-flow, and rotary sieve 6 is conducive to gas Stream is evenly distributed in air inlet, thus the two combine can effectively rectify with guidance air-flow, reduce turbulent flow in air-flow and Sinuous flow forms smooth air-flow, reduces the whirlpool that air-flow is formed before entering blower fan system 4.

Embodiment two

Referring to Fig. 8 and Fig. 9, in the present embodiment, with above-described embodiment three the difference is that, the first ternary blower 41 (as first order blower) and second ternary blower 42 (as second level blower) dislocation arrangement, i.e. the first spiral case 411 and second Spiral case 412 is in reversely, and the first air inlet 413 of the first ternary blower 41 is close to right side, the second air inlet of the second ternary blower 42 Mouth 423 is close to left side, and the second air outlet 414 of the first ternary blower 41 is close to left side, the second outlet air of the second ternary blower 42 Mouthfuls 424 close to right side, at this time the second air inlet of the first air outlet 414 of the first ternary blower 41 and the second ternary blower 42 423 corresponding in vertical direction or close correspondences.The distance between first air inlet 413 and the second air inlet 423 are Vertical Square Upward distance.

Embodiment three

Referring to Figure 10 and Figure 11, in the present embodiment, with above-described embodiment three the difference is that, the first ternary blower 41 and the second obliquely upper and lower arranged for interval respectively of ternary blower 42, i.e. the first air inlet 413 and water of the first ternary blower 41 Square to inclinedly downward, the second air inlet 423 of the second ternary blower 42 and horizontal direction are inclinedly downward.

Pass through between first air outlet 414 of the first ternary blower 41 and the second air inlet 423 of the second ternary blower 42 Guide duct 46 connects.Vertical range between 413 center of the first air inlet of first ternary blower 41 and the entrance in air duct 25 is 0.5~2 times of the diameter of first 3 d impeller 412.

The blower whole height of this tilting series system, composition is lower, and fan outlet static pressure is larger, is conducive to overcome The high-rise resistance of ducting, further, since the small size of ternary blower, Wind Volume, solve the problems, such as that floor layer height is limited.

Claims (14)

1. a kind of range hood, cabinet (2) and lampblack filter including exhaust fume collecting hood (1), setting above exhaust fume collecting hood (1), It is formed with air inlet (11) on the exhaust fume collecting hood (1), is formed with air duct (25), the lampblack filter in the cabinet (2) Including being arranged oil network (8) at the air inlet (11), the oil network (8) integrally in it is up big and down small, by air inlet (11) The taper extended downwardly is provided with blower fan system (4) in the cabinet (2), it is characterised in that: the blower fan system (4) includes The the first ternary blower (41) and the second ternary blower (42) being arranged in series, the lampblack filter further include being arranged described The rotary sieve (6) of interior, air duct (25) the inlet of cabinet (2).

2. range hood according to claim 1, it is characterised in that: the oil network (8) includes internal layer oil network (81) and sets The outer layer oil network (82) in internal layer oil network (81) periphery is set, the internal layer oil network (81) includes inner layer net ontology (811) and opens up The first ventilation hole (812) on inner layer net ontology (811), the outer layer oil network (82) include outer layer net ontology (821) and open The second ventilation hole (822) being located on outer layer net ontology (821), first ventilation hole (811) is less than the second ventilation hole (821), first ventilation hole (811) and the second ventilation hole (821) interlaced arrangement make the orthographic projection in same level Partly it is overlapped.

3. range hood according to claim 2, it is characterised in that: first ventilation hole (812) assumes diamond in shape, and described The length of one ventilation hole (812) is 1.0~2.0mm, width is 1.0mm~2.0mm, two the first ventilation holes of arbitrary neighborhood (812) most short side between is away from for 0.3~0.6mm.

4. range hood described in any one of claim 1 to 3, it is characterised in that: the rotary sieve (6) includes using In the Dropbox (61) of filtering fume excessively and the motor (62) for driving Dropbox (61) to rotate, the output shaft of the motor (62) (621) it is inserted into the center of Dropbox (61) and is connected and fixed, the motor (62) is connected by electric machine support (622) and cabinet (2) Connect fixation.

5. range hood according to claim 4, it is characterised in that: offer on the surface of the Dropbox (61) along center The slot (611) of arc that is symmetrical and being arranged in array, each slot (611) radially extending along Dropbox, and the slot (611) edge The radial direction of Dropbox (61) is at least distributed with two layers.

6. range hood according to claim 4, it is characterised in that: the air duct (25) is in diminishing from the bottom to top Shape.

7. range hood described in any one of claim 1 to 3, it is characterised in that: in the cabinet (2), be located at rotation Turn to be provided with oil drain pan (7) below strainer (6).

8. range hood according to claim 7, it is characterised in that: the oil drain pan (7) includes disk ontology (71), described The cross-section adaptation of the shape of disk ontology (71), size and cabinet (2), and the edge of disk ontology (71) is located at cabinet (2) Simultaneously extend the bottom edge of cabinet (2) and be supported below air inlet (11) edge of exhaust fume collecting hood (1) in lower section.

9. range hood according to claim 8, it is characterised in that: the intermediate of the disk ontology (71) forms opening (711), the disk ontology (71) extends a distance up to form diversion division (72), the diversion division at opening (711) (72) relatively with rotary sieve (6), the edge of the rotary sieve (6) exceeds diversion division (72).

10. range hood described in any one of claim 1 to 3, it is characterised in that: the first ternary blower (41) Including the first 3 d impeller (412) and the first air inlet (413), the second ternary blower (42) includes the second 3 d impeller (422) and the second air inlet (423), on oil smoke flow path, second air inlet (423) is located at the first air inlet (413) downstream, first air inlet (413) and the second air inlet (423) are towards identical direction.

11. range hood according to claim 10, it is characterised in that: the first 3 d impeller (412) and the second ternary leaf The diameter for taking turns (422) is identical, the distance between first air inlet (413) and the second air inlet (423) and the first ternary leaf Take turns the ratio 0.2~1 of the diameter of (412).

12. range hood according to claim 10, it is characterised in that: first air inlet (413) and the second air inlet Mouth (413) is downward in horizontal arrangement, the first air inlet (413) and air duct (25) entrance of the first ternary blower (41) The distance between be 1~2 times of the first 3 d impeller (412) diameter, the center and air duct of first 3 d impeller (412) (25) distance of entrance is greater than the diameter of the first 3 d impeller (412).

13. range hood according to claim 10, it is characterised in that: first air inlet (413) and the second air inlet Mouth (423) is obliquely downward in tilting, the first air inlet (413) center and air duct of the first ternary blower (41) (25) the vertical range between entrance is 0.5~2 times of the diameter of the first 3 d impeller (412).

14. range hood according to claim 13, it is characterised in that: the first outlet air of the first ternary blower (41) It is connected between mouth (414) and the second air inlet (423) of the second ternary blower (42) by guide duct (46).