CN207554420U

CN207554420U - A kind of backward centrifugal blower and range hood for range hood

Info

Publication number: CN207554420U
Application number: CN201721275451.1U
Authority: CN
Inventors: 刘逸; 梁雪斐; 周佳杰; 茅忠群; 诸永定; 刘戈
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2017-09-30
Filing date: 2017-09-30
Publication date: 2018-06-29
Anticipated expiration: 2027-09-30

Abstract

The utility model discloses a kind of backward centrifugal blowers for range hood, and including impeller, the impeller includes shroud, hub disk and the multiple blades being arranged between shroud and hub disk, it is characterised in that：The blade is prismatic blade.Also disclosing a kind of application has the range hood of the backward centrifugal blower.By the way that the deep arc shaped blade of backward wind turbine is changed to prismatic blade, it is not easy to long-pending oil, it is also insensitive to long-pending oil, therefore it is highly suitable for the environment of range hood；By setting small number of blade, with reference to the shape (prismatic blade) of blade so that backward wind turbine is without the spiral case in impeller outer setting diffusion, cleaning, maintenance convenient for wind turbine；And blade quantity is less, and leaf road is wider, and separation vortex is not easy to plug channel, can improve flow efficiency, is more conform with pollutant flow direction, and dust stratification is also less, is convenient to clean incrustation.

Description

A kind of backward centrifugal blower and range hood for range hood

Technical field

The utility model is related to machine for kitchen use, especially a kind of backward centrifugal blower and application for range hood There is the range hood of the backward centrifugal blower.

Background technology

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 range hood of top suction type utilize the principle that hot gas rises, and 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, it is and in an increasingly wide range of applications, but since it is dynamic Power source from hearth farther out, makes the suction effect of power source reduce, and oil smoke cannot exhaust completely；The range hood of near-absorption type utilizes whirlpool It is separate to flow wind pressure, the major part oil smoke nearer apart from hearth with form of arcs is absorbed, the bad shadow to health can be reduced Ring, and power source is nearer from hearth, will not substantially reduce the suction effect of power source, but due to the oil smoke rate of climb compared with The oil smoke escaped upwards soon or to minority is helpless.

Existing range hood, a kind of range hood as disclosed in the Chinese patent application No. is 201420665919.8, Including casing, exhaust fume collecting hood, centrifugal blower, panel, oil network, deflector and oil-containing groove, exhaust fume collecting hood is arranged on the top of casing, centrifugation Wind turbine is arranged in exhaust fume collecting hood, and the air inlet of centrifugal blower is facing forward；For another example application No. is 201610738828.6 Chinese patent The water conservancy diversion sound-absorbing solid noise reduction system of disclosed a kind of kitchen ventilator, including host shell, the air duct system being arranged in host shell System, the ducting system includes blower housing, the air inlet being arranged on blower housing, opposite with the air inlet The medial surface of host shell be equipped with the major flow noise reduction body that extends up and down, air inlet is towards host shell by left side Or right side.

Centrifugal blower is divided into forward centrifugal wind turbine and backward centrifugal blower, and air quantity is larger in oil smoke ventilation, the effect of wind turbine Rate can become an important factor for system operation economy.Traditional range hood uses forward centrifugal wind turbine, and there are many blade quantity, Dust stratification can be several times as much as the thickness of blade, the Severe blockage air inlet of impeller；Secondly, referring to Fig. 7, deep arc shaped blade easily dust stratification, So as to destroy the molded line of impeller channel, wind turbine air quantity and pressure after short-term operation can be greatly reduced, and lead to wind turbine function Failure, forward centrifugal wind turbine is because its own structure and principle make its efficiency low, and declared working condition point static pressure efficiency is below 50%.

Referring to Fig. 8, forward centrifugal blower press plateau is in be horizontally orientated to more, and static pressure gradient is smaller, system resistance Variation can lead to the large change of air quantity.As the preceding fluctuation ± 30Pa to centrifugal blower static pressure, air quantity is then in ± 1200m³/h In the range of fluctuate.With " shape of a saddle " unstable characteristic be forward centrifugal wind turbine it is intrinsic the characteristics of, show as pressure reach most Reduce and pressure decline with air quantity after high point, then rise again, curve tendency is showed in horse-saddle figure, forward centrifugal wind turbine Pressure curve, if running operating point at the left side of highest static pressure force A points, wind turbine enter unstable region work, operation Point can be from the small air quantity direction drift of trend.Once into " shape of a saddle " region of pressure curve, air quantity can drastically decline, straight to cause to slide Fall on " shape of a saddle " bottom B points.

And for centrifugal blower compared with forward centrifugal wind turbine, characteristic curve is much steeper backward.Equally, when pressure oscillation ± During 30Pa, the air quantity of backward centrifugal blower is in ± 500m³/ h is fluctuated.The characteristic of backward centrifugal blower is to reduce pressure with air quantity to be in Monotone increasing trend, the region that can be run is broader, without apparent " shape of a saddle " region, therefore can steadily run.

Backward centrifugal blower has had application in fields such as some air-conditionings, air purification at present, such as application No. is A kind of backward centrifugal blower fan blade wheel disclosed in 201510428558.4 Chinese patent, including impeller front disc, impeller hub disk, with And the more blades between disk and impeller hub disk, the interior of blade arcuately before go out before the impeller, i.e., blade include blade outer and Edge is arc in blade；For another example application No. is 201310217396.0 Chinese patent disclosed in a kind of strong backward centrifugation wind Machine including volute of blower, has wind turbine leaf dish chamber, into and out of air port, wind turbine leaf dish includes the left and right fixed disk of blade and one group of circle Arc blade, one group of curved blade are fixed on the left and right fixation of blade around the circumferencial direction of the left and right fixed disk of blade with space state Between disk, and it is corresponding with air outlet.

However, since range hood internal grease is more, if above-mentioned backward centrifugal blower is applied directly to oil suction In smoke machine, it will as the blade of forward centrifugal wind turbine, cause long-pending oil, dust stratification serious or even destroy runner-type line, lead to wind The failure of machine function.Therefore, it need to be further improved.

Utility model content

First technical problem to be solved in the utility model is in view of the above-mentioned problems of the prior art, providing one Kind improves the backward centrifugal blower for range hood of flow efficiency.

Second technical problem to be solved in the utility model is in view of the above-mentioned problems of the prior art, providing one Kind application has the range hood of above-mentioned backward centrifugal blower.

First technical solution is used by the utility model solves above-mentioned technical problem：It is a kind of for range hood Backward centrifugal blower, including impeller, the impeller includes shroud, hub disk and the multiple leaves being arranged between shroud and hub disk Piece, it is characterised in that：The blade is prismatic blade.

It in order to make up the deficiency of prismatic blade acting ability, and is avoided that impeller stall in high rotating speed, causes impeller operation It is unstable.Each blade has blade outer, and the blade outer of each blade is on same circumference, each blade and circle Contour intersection has tangent line, and the angle between each blade and corresponding tangent line is α, and the value range of α is 40 °~65 °.

To give full play to the acting ability of prismatic blade, and so that leaf road channel is wider, separation vortex is not easy to plug channel, Flow efficiency is improved, is convenient to clean incrustation, the quantity of the blade is 12~18.

In order to make up the acting scarce capacity of prismatic blade, while avoid rotating speed is excessively high from causing noise excessive, the impeller Rotating speed is 1500~2800rpm.

In order to air-flow is guided to enter in wind turbine, further include air inlet mouth circle, the centre of the shroud offers opening, it is described into Air port circle is arranged on side of the shroud far from hub disk, and the centre of the air inlet mouth circle offers opening to form backward centrifugal blower Air inlet, the air inlet edge is inserted into opening.

In order to be suitble to be embedded into the range hood in cabinet, convenient for being hidden in cabinet, the spacing of the shroud and hub disk Maximum is d, and the value range of d is 40~60mm.

Second technical solution is used by the utility model solves above-mentioned technical problem：A kind of application has as described above Backward centrifugal blower range hood, the cabinet including exhaust fume collecting hood and above exhaust fume collecting hood, the backward centrifugal blower sets It puts in cabinet.

In order to reduce noise of the wind turbine to front transfer, the backward centrifugal blower is close to the rear side and air inlet of cabinet Forward, the front side of the cabinet inside, the position opposite with backward centrifugal blower are provided with noise reduction module.

For ease of wind turbine is arranged in cabinet, the backward centrifugal blower further includes the driving for impeller to be driven to rotate Motor, fan supporter is provided in the cabinet, and the fan supporter includes fore-stock and after-poppet, the air inlet mouth circle and wind The fore-stock connection of machine support is fixed, and the impeller is placed between fore-stock and after-poppet, the output shaft of the driving motor from Side of the hub disk far from shroud is inserted between hub disk and shroud and fixation is connect with hub disk.

Compared with prior art, the utility model has the advantage of：By the way that the deep arc shaped blade of backward wind turbine is changed to directly Blade, it is not easy to long-pending oil, it is also insensitive to long-pending oil, therefore it is highly suitable for the environment of range hood；By setting lesser amt Blade, with reference to the shape (prismatic blade) of blade so that backward wind turbine is without the spiral case in impeller outer setting diffusion, convenient for wind turbine Cleaning, safeguard；And blade quantity is less, and leaf road is wider, and separation vortex is not easy to plug channel, can improve flow efficiency, Pollutant flow direction is more conform with, dust stratification is also less, is convenient to clean incrustation.

Description of the drawings

Fig. 1 is the schematic diagram of the range hood of the utility model；

Fig. 2 is the sectional view of the range hood of the utility model；

Fig. 3 is the blower rack of range hood of the utility model and the assembling schematic diagram of wind turbine；

Fig. 4 is the blower rack of Fig. 3 and the decomposition texture schematic diagram of wind turbine；

Fig. 5 is the side view of the impeller of the range hood of the utility model；

Fig. 6 is the sectional view of the impeller of the range hood of the utility model；

Fig. 7 is the forward centrifugal fan impeller structure of the prior art and vane dust deposition schematic diagram；

Fig. 8 is the forward centrifugal wind turbine of the prior art and backward centrifugal blower performance comparison schematic diagram.

Specific embodiment

The utility model is described in further detail below in conjunction with attached drawing embodiment.

Referring to Fig. 1~Fig. 6, a kind of range hood, the cabinet 2 including exhaust fume collecting hood 1 and above exhaust fume collecting hood 1, for ease of Description, hereinafter, "front", "rear", "left", "right", " on ", " under " each mean user when using range hood, oil suction Smoke machine and does not limit structure relative to the orientation of user.

Blower fan system 3 is provided in cabinet 2, in the present embodiment, blower fan system 3 uses backward centrifugal blower, including leaf Wheel 31, air inlet mouth circle 32 and driving motor 33.Wherein, impeller 31 includes shroud 311, hub disk 312 and is arranged on 311 and of shroud Multiple blades 313 between hub disk 312, the as shown by the arrows in Figure 6 as direction of rotation of impeller 31.

Shroud 311 is disc-shaped, and the centre of shroud 311 offers opening 3111, so as to oil smoke air-flow from opening 3111 at into Enter into impeller 31.Shroud 311 can be the disk of plane or have certain thickness in far from 312 direction of hub disk protrusion Round platform, and at this time size of the shroud 311 far from 312 one end of hub disk be less than close to 312 one end of hub disk size.Hub disk 312 It is similary disc-shaped, it is preferred that in the disk of plane.

Air inlet mouth circle 32 is arranged on side of the shroud 311 far from hub disk 312, and the centre of air inlet mouth circle 32 equally offers out For mouth to form the air inlet 321 of blower fan system 3, air inlet 321 is corresponding with opening 3111, is rotated for ease of impeller 31, air inlet The shroud 311 of circle 32 and impeller 31 is simultaneously not fixed, and 321 edge of air inlet can suitably be inserted into a part in opening 3111.

Spacing between shroud 311 and hub disk 312 is that (when shroud 311 is prominent forward, d is 311 front end of shroud to d With the spacing between hub disk 312), i.e. d is shroud 311 and the maximum spacing of hub disk 312, and the value range of d is 40~60mm, thus So that impeller 31 is whole very thin, it is suitble to be embedded into the range hood in cabinet, convenient for being hidden in cabinet.

Blade 313 uses prismatic blade, it is not easy to which long-pending oil, the influence to impeller 31 long-pending oil is insensitive, thus can fit For the environment of range hood.Each blade 313 has outside the blade outer 3131 in exit, the blade of each blade 313 Along 3131 on same circumference 3132.Each blade 313 also has along 3133 in blade, and blade is interior along 3133 and opening 3111 edge corresponds to, and blade outer 3131 can be corresponding with the edge of hub disk 312.

Since the acting ability of prismatic blade is not as good as the arc shaped blade of bending, it is therefore desirable to the angle of stringent control blade. In the present embodiment, the angle between 3132 intersection tangent line L of each blade 313 and circumference is α, the value range of α for 40 °~ 65°.Only angle α is enough big, just can overcome the disadvantages that the deficiency of prismatic blade acting ability, but if α is too big, also results in impeller 31 in height Stall during rotating speed causes impeller 31 to operate unstable.

The quantity of blade 313 is 12~18, and the blade 313 set in this way counts less, can give full play to prismatic blade Acting ability, and the leaf road Q channels between adjacent blades 313 are wider, and separation vortex is not easy to plug channel, can improve flowing Efficiency；And leaf road Q long and slowly expansion, be more conform with pollutant flow direction, dust stratification is also less；Further, since blade 313 Arrangement is more sparse, is convenient to clean incrustation.

In order to make up the acting scarce capacity of prismatic blade, rotating speed cannot be too low, therefore the rotating speed of impeller 31 is controlled 1500 ~2800rpm, but the rotating speed of impeller 31 can not be too high, it is no excessive it will cause noise.

Backward centrifugal blower using prismatic blade, and prismatic blade arrangement (leaf road is wider, and leaf road internal vortex is reduced, Exit flow is more smooth), in the present embodiment, backward centrifugal blower without setting spiral case again.The top of cabinet 2 is provided with out Fan housing 5, when impeller 31 rotates, the air-flow of upstream pushes the air-flow in downstream to be discharged from outlet housing 5 after the acting of impeller 31.This nothing The structure of spiral case, convenient for maintenance management, without removing blower fan system 3, the dimensions such as grease can be purged by opening the chamber door of cabinet 2 Shield.

Fan supporter 4 is provided in cabinet 2, fan supporter 4 includes fore-stock 41 and after-poppet 42, enters the wind mouth circle 32 and wind The connection of fore-stock 41 of machine support 4 is fixed, and impeller 31 is placed between fore-stock 41 and after-poppet 42.The output shaft of driving motor 33 331 are inserted between hub disk 312 and shroud 311 from side of the hub disk 312 far from shroud 311 and connect fixation with hub disk 312, So as to which driving motor 33 can drive impeller 31 to rotate.The rear side of driving motor 33 is fixed with after-poppet 42.Blower fan system 3 as a result, It is arranged in cabinet 2 by fan supporter 4 and the rear side of relatively close cabinet 2, the air inlet 321 of blower fan system 3 is facing forward.Machine Front side inside case 2, the position opposite with blower fan system 3 are provided with noise reduction module 21, and acoustical cotton or resonant cavity etc. may be used, To reduce the noise that blower fan system 3 is propagated forward.The top of cabinet 2, blower fan system 3 air outlet be provided with outlet housing 5, wind turbine system The oil smoke of 3 discharge of system is drained into common flue by outlet housing 5.

The efficiency of backward centrifugal blower is higher by forward centrifugal wind turbine 15%~20% generally more than 80%, backward to centrifuge Fan induced draught is efficient, noise is low, stability of characteristics, efficient, dynamic pressure composition smaller, avoids that noise is big, bulky shortcoming, With better aeroperformance, it is more suitable for Chinese kitchen environment；And Voluteless fan case is managed for oil smoke air draft convenient for safeguarding Reason, without removing wind turbine, the maintenances such as grease can be purged by opening chamber door.

Claims

1. a kind of backward centrifugal blower for range hood, including impeller (31), the impeller (31) including shroud (311), Hub disk (312) and the multiple blades (313) being arranged between shroud (311) and hub disk (312), it is characterised in that：The leaf Piece (313) is prismatic blade.

2. the backward centrifugal blower according to claim 1 for range hood, it is characterised in that：Each blade (313) With blade outer (3131), the blade outer (3131) of each blade (313) is on same circumference (3132), each Blade (313) has tangent line (L), the angle between each blade (313) and corresponding tangent line (L) with circumference (3132) intersection For α, the value range of α is 40 °~65 °.

3. the backward centrifugal blower according to claim 1 for range hood, it is characterised in that：The blade (313) Quantity be 12~18.

4. the backward centrifugal blower according to claim 1 for range hood, it is characterised in that：The impeller (31) Rotating speed is 1500~2800rpm.

5. the backward centrifugal blower according to claim 1 for range hood, it is characterised in that：Further include air inlet mouth circle (32), the centre of the shroud (311) offers opening (3111), and it is separate that the air inlet mouth circle (32) is arranged on shroud (311) The side of hub disk (312), the centre of the air inlet mouth circle (32) offer opening to form the air inlet of backward centrifugal blower (321), air inlet (321) edge is inserted into opening (3111).

6. the backward centrifugal blower according to any one of claims 1 to 4 for range hood, it is characterised in that：Institute The spacing maximum for stating shroud (311) and hub disk (312) is d, and the value range of d is 40~60mm.

7. a kind of range hood using with good grounds backward centrifugal blower according to any one of claims 1 to 6, including collecting cigarette (1) and the cabinet (2) above exhaust fume collecting hood (1) are covered, the backward centrifugal blower is arranged in cabinet (2).

8. range hood according to claim 7, it is characterised in that：The backward centrifugal blower is after cabinet (2) Side and air inlet (321) is forward, the internal front side of the cabinet (2), the position opposite with backward centrifugal blower are provided with drop Module of making an uproar (21).

9. range hood according to claim 7 or 8, it is characterised in that：The backward centrifugal blower further includes to drive The driving motor (33) of movable vane wheel (31) rotation, the cabinet (2) is interior to be provided with fan supporter (4), fan supporter (4) packet Fore-stock (41) and after-poppet (42) are included, is arranged on air inlet mouth circle (32) and wind turbine of the shroud (311) far from hub disk (312) side Fore-stock (41) connection of stent (4) is fixed, and the impeller (31) is placed between fore-stock (41) and after-poppet (42), the drive The output shaft (331) of dynamic motor (33) is inserted into hub disk (312) and shroud from side of the hub disk (312) far from shroud (311) (311) fixation is connect between and with hub disk (312).