CN203501259U - Range hood - Google Patents
Range hood Download PDFInfo
- Publication number
- CN203501259U CN203501259U CN201320356582.8U CN201320356582U CN203501259U CN 203501259 U CN203501259 U CN 203501259U CN 201320356582 U CN201320356582 U CN 201320356582U CN 203501259 U CN203501259 U CN 203501259U
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- CN
- China
- Prior art keywords
- oil smoke
- centrifugal blower
- lampblack absorber
- communicated
- centrifugal
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Abstract
The utility model relates to a range hood which comprises a casing, wherein an oil smoke inlet is formed in the lower part of the casing, and an oil smoke outlet is formed in the upper part of the casing. A fan system is arranged in the casing, wherein an air inlet of the fan system is communicated with the oil smoke inlet, and an air outlet of the fan system is communicated with the oil smoke outlet. The range hood is characterized in that the fan system comprises a first centrifugal fan and a second centrifugal fan; an air inlet of the first centrifugal fan is communicated with the oil smoke inlet; an air inlet of the second centrifugal fan is communicated with an air outlet of the first centrifugal fan through a bent connecting pipeline, and an air outlet of the second centrifugal fan is communicated with the oil smoke outlet. Compared with the prior art, the range hood has the advantages that the air pressure of the fan system is increased by matching the two centrifugal fans, so that when the fan system is in a using state, even if a high-resistance pipe network exists, the fan system can also has relatively high discharge air pressure, the discharge flow is also increased, the rotating speed of the two centrifugal fans is not too high, the noises are lower, and the high-efficiency silent-absorption demand of the range hood can be met.
Description
Technical field
The utility model relates to a kind of lampblack absorber, particularly relates to the lampblack absorber that a kind of fume-exhausting efficiency is high, noise is low.
Background technology
The smoke absorption effect of a range hood depends primarily on it and is using the flow that can discharge under status condition, and flow is larger, and smoke absorption effect is also better.The delivery flow of range hood under use state depends primarily on the blast of range hood fan system, and blast is larger, and delivery flow is also larger.The blast of range hood fan system is the power of motor that depends on blower fan system, and power of motor is larger, and the blast of blower fan system is larger.The lampblack absorber of normal domestic use is when the state of use, oil smoke need to be discharged oil smoke by smoke exhaust pipe, check (non-return) valve, discharge flue, the use of these drag devices, makes oil smoke have certain back pressure at oil smoke outlet place, and the existence of back pressure can affect the delivery flow of lampblack absorber greatly.The blast of blower fan system has a positive effect to the delivery flow of lampblack absorber, and back pressure measures negative consequence to the discharge currents of lampblack absorber, the two is in the use procedure of lampblack absorber, all objective reality, and conflicting, therefore in use, blower fan system meeting automatic governing, makes its duty in a relative equilibrium to a lampblack absorber.The use state operating mode that accompanying drawing 2 is general lampblack absorber, blast-flow performance curve that wherein curve 2 ' is lampblack absorber, curve 1 ' is use state down-off-back pressure curve, intersection point P is the operating point of lampblack absorber under this use state.From accompanying drawing 2, blower fan system flow after 250Pa has the situation of fast-descending, in this region, if the resistance increment of oil smoke discharge line, P point will move down, this kind of situation can cause flow decline too fast, blower fan system is in order to guarantee to get rid of flow, will strengthen blast, after but blast increases, the noise of lampblack absorber also can increase thereupon, simultaneously, because the blast of current lampblack absorber is probably between 300-350pa, therefore operating point P is difficult to avoid this descending branch, although blast has increased, but the flow of getting rid of but improves not quite, increased on the contrary noise.The rotating speed of the blower fan of general lampblack absorber under use state is 1200～1300rpm, if when resistance of pipe system strengthens or common flue internal pressure increases, its rotating speed also will increase, now electric efficiency can decline; When the rotating speed of blower fan is higher, noise is just larger.
General lampblack absorber analysis situation of rotating speed and efficient point under state is all the time as follows: at present, rotating speed 1200～the 1300rpm of general cigarette machine under User Status, as the a-quadrant in Fig. 3, when if resistance of pipe system strengthens or common flue internal pressure increases, its rotating speed also will increase, and A point region can move down, and electric efficiency can decline, when the rotating speed of blower fan is higher, noise is just larger.
Therefore, at present the blower fan system of lampblack absorber is poor to the smoke evacuation of high-drag pipe network, larger impact the suitability of lampblack absorber affect the smoke absorption effect under User Status.And at present, because larger a part of lampblack absorber in city is when being used state, oil smoke is except needs are by the smoke exhaust pipe of itself, after check (non-return) valve and discharge flue, also need to connect firebreak device and common flue could be discharged oil smoke, for the higher residential building of some floors, common flue is often longer, and the outlet of common flue is arranged on the top of floor, like this for the resident family that is positioned at low floor, the back pressure of its lampblack absorber will be very large, the use of so many drag devices, the flow that can make lampblack absorber carve in use significantly reduces, smoke absorption effect variation, noise is larger simultaneously, if want to improve air draft effect, current most way improves power of motor exactly, increasing exhaust flow, though the result of doing like this some increase of flow but noise can increase very large often, attend to one thing and lose sight of another.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned prior art, to provide a kind of can also keep compared with high workload efficiency, more low noise lampblack absorber in high-drag pipe network situation.
The utility model solves the problems of the technologies described above adopted technical scheme: this lampblack absorber, comprise casing, casing below is provided with oil smoke import, casing top is provided with oil smoke outlet, the blower fan system that be provided with in casing that air intake vent is communicated with described oil smoke import, air outlet and the outlet of described oil smoke is communicated with, is characterized in that: described blower fan system comprises:
The first centrifugal blower, the air intake vent of the first centrifugal blower is communicated with described oil smoke import;
The second centrifugal blower, the connecting pipe by a bending between the air outlet of the air intake vent of the second centrifugal blower and the first centrifugal blower is communicated with, and the air outlet of the second centrifugal blower is communicated with described oil smoke outlet;
Described blower fan system is connected with lampblack absorber control system.
Two centrifugal blowers are set, and by the connecting pipe of a bending, both are communicated with, make lampblack absorber under service condition, blower fan system energy self adaptation is by flow, noise, power consumption can match most suitable operating point, thereby accomplish efficient quiet suction, in addition, the blower fan system that the utility model provides also has good fume purifying function, when oil smoke is through oil smoke import, when the first centrifugal blower is discharged, the temperature of oil smoke can reduce, the lower gas of oil smoke the inside freezing point starts to solidify, when arriving the second centrifugal blower, can cover on the impeller and spiral case of the second centrifugal blower, oil smoke on impeller can be thrown to along with the rotation of centrifugal impeller on spiral case, by spiral case, derive again, reach the object of purifying smoke.Crooked connecting pipe design, in the time of making oil smoke through connecting pipe, the drag reduction that can run into, produces less separating force simultaneously, thereby makes reducing noise.
Two centrifugal blowers are set in blower fan system, this can increase the volume of lampblack absorber undoubtedly, as improvement, described the first centrifugal blower and the second centrifugal blower be arranged in parallel up and down, the benefit of doing is like this not guarantee that whole lampblack absorber, thickness direction being installed without doing too large change, only need to increase the length of lampblack absorber.Can guarantee like this neat and artistic of whole kitchen finishing and coordinate, because limited often for the space of lampblack absorber is installed in kitchen, at installation thickness direction, can keep previous level, can be that whole lampblack absorber is unlikely to stretch out the kitchen range top, and distance between lampblack absorber and roof, kitchen is very sufficient mostly, even so lampblack absorber length increases to some extent, can not affect installation and attractive in appearance yet.
Improve again, described the first centrifugal blower and the second centrifugal blower are all obliquely installed, angle between line perpendicular to the ground is 20 degree～40 degree, best with 30 degree positions, so more can make the installation thickness of whole lampblack absorber be unlikely to too thick, can not affect lampblack absorber whole machine installation, can not affect harmony and the aesthetics of kitchen integral installation yet.
Improve, the curvature of the curve each several part of described connecting pipe is identical with gas flow curvature of a curve or approaching again, and the resistance that tube connector can produce like this can be as far as possible little, produces separating force little simultaneously, is more conducive to reduce noise.
Improve, be provided with the detecting unit that gathers flue back pressure in lampblack absorber flue, this detecting unit is connected with lampblack absorber control system.
Compared with prior art, the utility model has the advantage of: the blast that increases blower fan system by mating two centrifugal blowers, make blower fan system when the state of use, even if there is high-drag pipe network, can have equally larger discharge blast, so emission flow also can strengthen, the rotating speed of two centrifugal blowers is without too high, noise is less, can meet the needs of the efficient quiet suction of lampblack absorber.In addition, to wind scale system, adopt the advantage of grading control to be environmental protection and energy saving, effectively utilize resource, make under mal-condition, oil smoke function is responded to smoke evacuation environment automatically, and automatically starts the two blower fan systems of series connection.
Accompanying drawing explanation
Fig. 1 is the structural representation of lampblack absorber in the utility model embodiment.
Fig. 2 is the use state operating mode schematic diagram of general lampblack absorber;
Fig. 3 is general soot motor efficiency and rotation speed relation figure.
The specific embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the utility model.
Lampblack absorber as shown in Figure 1, comprise casing 1, casing 1 below is provided with oil smoke import 2, and casing 1 top is provided with oil smoke outlet 3, in casing 1, be provided with that air intake vent is communicated with described oil smoke import 2, air outlet and described oil smoke outlet 3 blower fan systems that are communicated with, this blower fan system comprises:
The air intake vent of the first centrifugal blower 4, the first centrifugal blowers 4 is communicated with described oil smoke import 2;
Connecting pipe 6 by a bending between second air intake vent of centrifugal blower 5, the second centrifugal blowers 5 and the air outlet of the first centrifugal blower 4 is communicated with, and the air outlet of the second centrifugal blower 5 is communicated with described oil smoke outlet 3.
In the present embodiment, described the first centrifugal blower 4 and the second centrifugal blower 5 be arranged in parallel up and down, and all tilt to install, and the angle between line perpendicular to the ground is 30 degree, and the air intake vent of the first centrifugal blower 4 is relative with described oil smoke import 2.The curvature of the curve each several part of described connecting pipe is identical with gas flow curvature of a curve or approaching.
In addition, blower fan system is connected with lampblack absorber control system, is provided with the detecting unit that gathers flue back pressure in lampblack absorber flue, and this detecting unit is connected with lampblack absorber control system.
Lampblack absorber control system adopts grading control mode to blower fan system, is specially:
Back pressure critical value is set in lampblack absorber control system;
When chimney meatus transmitting smoke smooth and easy, when in the flue that lampblack absorber control system collects, back pressure is less than back pressure critical value, lampblack absorber control system is exported the first control signal, only drives the first centrifugal blower or the second centrifugal blower work, and corresponding the second centrifugal blower or the first centrifugal blower are had a rest;
When flue is obstructed, flue back pressure increases, when in the flue that lampblack absorber control system collects, back pressure is more than or equal to back pressure critical value, lampblack absorber control system is exported the second control signal, drive the first centrifugal blower and the second centrifugal blower work, the first centrifugal blower and the second centrifugal blower are worked simultaneously simultaneously, make the whole blower fan system of lampblack absorber produce large static pressure, opposing flue resistance, so that smooth fume exhaust.
The advantage of such classification: environmental protection and energy saving, effectively utilize resource, make under mal-condition, oil smoke function is responded to smoke evacuation environment automatically, and automatically starts the two blower fan systems of series connection.
Above-mentioned blower fan system can meet the efficient quiet suction of lampblack absorber former because: according to blower fan theory and Bernoulli equation:
P
tf1η
1-h
front 1=P
1+ ρ υ
1 2/ 2;---1.
Formula is middle P 1.
tf1be the total head of the first centrifugal blower, η
1be the efficiency of the first centrifugal blower; h
front 1be the first centrifugal blower front end drag losses, P
1be the first centrifugal blower exit static pressure, ρ is atmospheric density, υ
1it is the first centrifugal blower muzzle velocity;
P
tf2η
2=P
3-P
2+ρ（υ
3 2-υ
2 2）/2；——②
Formula is middle P 2.
tf2be the second centrifugal blower total head, η
2be the second centrifugal blower efficiency, P
3be the second centrifugal blower exit static pressure, P
2be the second centrifugal blower import static pressure, ρ is atmospheric density, υ
3it is the second centrifugal blower muzzle velocity;
P
1+ ρ υ
1 2/ 2-h
connect=P
2+ ρ υ
2 2/ 2;---3.
Formula is middle υ 3.
2be the inlet velocity of the second centrifugal blower 2, h
connectfor the drag losses of connecting pipe, all the other are with above the same.
Will be 3. substitution 1.+2. after, obtain:
P
tf1η
1+ P
tf2η
2=P
3-ρ (υ
1 2-υ
2 2)/2+ (h
connect+ h
front 1)+ρ υ
1 2/ 2+ ρ (υ
3 2-υ
2 2)/2;---4.;
4. formula is simplified:
Because flow is continuous, so A
1υ
1=A
3υ
3, when the first centrifugal blower is equal with the second centrifugal blower discharge area, have υ
1=υ
3
4. equation is reduced to:
P
tf1η
1+ P
tf2η
2=P
3+ (h
connect+ h
front 1)+ρ υ
3 2/ 2---5.;
For the centrifugal blower of appropriate design, efficiency is more approaching, because front end resistance is less, therefore above formula streamline any further into:
(P
tf1+ P
tf2) η=P
3+ h
connect+ ρ υ
3 2/ 2
From above formula, the drag losses of tube connector has much relations to flow and blast, therefore during design tube connector, make the curvature of curve each several part identical with gas flow curvature of a curve or approaching, the resistance that tube connector can be produced is as far as possible little, and generation is simultaneously separated little, and makes reducing noise, when tube connector optimal design, h
connectunder User Status, can ignore, therefore above formula is reduced to:
（P
tf1+P
tf2）η=P
3+ρυ
3 2/2；——⑥；
For general blower fan system, we can be listed as following equation:
P
tfη=P+ρυ
2/2；——⑦；
Analyze:
(1), the blast of blower fan be flow while being zero blower press be multiplied by efficiency, when flow is zero, the load of motor is zero substantially, therefore motor is worked under maximum speed, two centrifugal blowers of the utility model coupling and the speed discrepancy of former blower fan are few, therefore the total pressure efficiency that the blast of the blower fan system that the utility model provides is two centrifugal blowers is added, and general blower fan system is the total pressure efficiency of a blower fan, therefore the blast of new blower fan system is increased;
(2), when cigarette machine, under use state, working is, due to P=ξ υ
2+ C(ξ=resistance of pipe system coefficient, C is the static pressure resistance of other user of high-rise building to it), ξ can be multiple times than ρ very much, so when blower fan system of the present utility model and General System compressor flow equate, can release P
tf1+ P
tf2=P
tfwhen impeller is fixedly time, blower press and rotating speed relation in direct ratio, therefore when the state of use down-off equates, blower fan system rotating speed of the present utility model can be less than former blower fan, user can remove to mate according to efficiency curve above the centrifugal blower of the utility model blower fan system, allow its rotary speed working in optimum working zone section, the flow reaching under User Status is greater than former blower fan, and noise is less than former blower fan, really accomplishes efficient quiet suction;
Use lampblack absorber of the present utility model to have good fume purifying function compared to existing lampblack absorber, when oil smoke is through air inlet, while discharging through first order centrifugal blower, the temperature of oil smoke can reduce, and the lower gas of oil smoke the inside freezing point starts to solidify, when arriving second level centrifugal blower, can cover on the impeller and spiral case of second level centrifugal blower, meeting on impeller is along with the rotation of centrifugal impeller is thrown on spiral case, then derives by spiral case, reaches the object of purifying smoke.
Claims (4)
1. a lampblack absorber, comprise casing, casing below is provided with oil smoke import, and casing top is provided with oil smoke outlet, the blower fan system that be provided with in casing that air intake vent is communicated with described oil smoke import, air outlet and the outlet of described oil smoke is communicated with, is characterized in that: described blower fan system comprises:
The first centrifugal blower, the air intake vent of the first centrifugal blower is communicated with described oil smoke import;
The second centrifugal blower, the connecting pipe by a bending between the air outlet of the air intake vent of the second centrifugal blower and the first centrifugal blower is communicated with, and the air outlet of the second centrifugal blower is communicated with described oil smoke outlet;
Described blower fan system is connected with lampblack absorber control system.
2. lampblack absorber according to claim 1, is characterized in that: described the first centrifugal blower and the second centrifugal blower be arranged in parallel up and down.
3. lampblack absorber according to claim 2, is characterized in that: described the first centrifugal blower and the second centrifugal blower are all obliquely installed, and the angle between line perpendicular to the ground is 20 degree～40 degree.
4. lampblack absorber according to claim 3, is characterized in that: the curvature of the curve each several part of described connecting pipe is identical or approaching with the gas flow curvature of a curve in this connecting pipe of flowing through.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320356582.8U CN203501259U (en) | 2013-06-21 | 2013-06-21 | Range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320356582.8U CN203501259U (en) | 2013-06-21 | 2013-06-21 | Range hood |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203501259U true CN203501259U (en) | 2014-03-26 |
Family
ID=50332235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320356582.8U Withdrawn - After Issue CN203501259U (en) | 2013-06-21 | 2013-06-21 | Range hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203501259U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103363563A (en) * | 2013-06-21 | 2013-10-23 | 宁波方太厨具有限公司 | Range hood and control method thereof |
| CN104048344A (en) * | 2014-07-07 | 2014-09-17 | 安庆市鸿裕工业产品设计有限公司 | Tail end suction reinforcing component of range hood |
| CN105042665A (en) * | 2015-08-31 | 2015-11-11 | 宁波方太厨具有限公司 | Series connection fan type extractor hood |
| CN105910146A (en) * | 2016-05-09 | 2016-08-31 | 王伟 | Double-wind-suction extractor hood |
| CN106524268A (en) * | 2016-12-30 | 2017-03-22 | 宁波方太厨具有限公司 | Range hood with double series fans |
| CN108278643A (en) * | 2017-01-06 | 2018-07-13 | 博西华电器（江苏）有限公司 | Smoke exhaust ventilator and its wind turbine connection tube |
-
2013
- 2013-06-21 CN CN201320356582.8U patent/CN203501259U/en not_active Withdrawn - After Issue
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103363563A (en) * | 2013-06-21 | 2013-10-23 | 宁波方太厨具有限公司 | Range hood and control method thereof |
| CN103363563B (en) * | 2013-06-21 | 2016-05-25 | 宁波方太厨具有限公司 | A kind of lampblack absorber and control method thereof |
| CN104048344A (en) * | 2014-07-07 | 2014-09-17 | 安庆市鸿裕工业产品设计有限公司 | Tail end suction reinforcing component of range hood |
| CN105042665A (en) * | 2015-08-31 | 2015-11-11 | 宁波方太厨具有限公司 | Series connection fan type extractor hood |
| CN105910146A (en) * | 2016-05-09 | 2016-08-31 | 王伟 | Double-wind-suction extractor hood |
| CN105910146B (en) * | 2016-05-09 | 2018-03-13 | 王伟 | A kind of double suction wind range hood |
| CN106524268A (en) * | 2016-12-30 | 2017-03-22 | 宁波方太厨具有限公司 | Range hood with double series fans |
| CN108278643A (en) * | 2017-01-06 | 2018-07-13 | 博西华电器（江苏）有限公司 | Smoke exhaust ventilator and its wind turbine connection tube |
| CN108278643B (en) * | 2017-01-06 | 2020-02-28 | 博西华电器（江苏）有限公司 | Smoke ventilator and fan linking pipe thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140326 Effective date of abandoning: 20160525 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20140326 Effective date of abandoning: 20160525 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |