CN103363563A - Range hood and control method thereof - Google Patents
Range hood and control method thereof Download PDFInfo
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- CN103363563A CN103363563A CN2013102484368A CN201310248436A CN103363563A CN 103363563 A CN103363563 A CN 103363563A CN 2013102484368 A CN2013102484368 A CN 2013102484368A CN 201310248436 A CN201310248436 A CN 201310248436A CN 103363563 A CN103363563 A CN 103363563A
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- lampblack absorber
- centrifugal blower
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Abstract
The invention relates to a range hood. The range hood comprises an enclosure, wherein a lampblack inlet is arranged below the enclosure; a lampblack outlet is arranged above the enclosure; the enclosure is internally provided with a fan system; an air inlet of the fan system is communicated with the lampblack inlet; an air outlet of the fan system is communicated with the lampblack outlet. The range hood is characterized in that the fan system comprises a first centrifugal fan and a second centrifugal fan, wherein an air inlet of the first centrifugal fan is communicated with the lampblack inlet; an air inlet of the second centrifugal fan is communicated with an air outlet of the first centrifugal fan through a bent connection pipeline; an air outlet of the second centrifugal fan is communicated with the lampblack outlet. Compared with the prior art, the range hood disclosed by the invention has the advantages that the two matched centrifugal fans are used for increasing air pressure of the fan system so that the fan system can have the greater discharging air pressure even if a high-resistance pipe net exists when the fan system is used; therefore, the discharging flow is also increased. The rotary speeds of the two centrifugal fans do not need to be too high and noises are low; and the requirement of efficient static suction of the range good can be met.
Description
Technical field
The present invention relates to a kind of lampblack absorber and control method thereof, particularly relate to the lampblack absorber that a kind of fume-exhausting efficient is high, noise is low.
Background technology
The smoke absorption effect of a range hood depends primarily on it and is using lower the flow that can discharge of status condition, and flow is larger, and smoke absorption effect is also better.The delivery flow of range hood under the 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 then 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, so that there is certain back pressure in oil smoke at oil smoke outlet place, 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 be objective reality, and conflicting, so a lampblack absorber in use, and blower fan system meeting automatic governing makes it be in the duty of a relative equilibrium.Accompanying drawing 2 is the use state operating mode of general lampblack absorber, and wherein curve 2 ' is the blast-flow performance curve of lampblack absorber, and curve 1 ' is use state down-off-back pressure curve, and intersection point P is the operating point of lampblack absorber under this use state.By accompanying drawing 2 as can be known, blower fan system flow after 250Pa has the situation of fast-descending, in this zone, if the resistance increment of oil smoke discharge line, then the P point will move down, it is too fast that this kind situation can cause flow to descend, and blower fan system will strengthen blast in order to guarantee to get rid of flow, after but blast increases, the noise of lampblack absorber also can increase thereupon, simultaneously, because the blast of present lampblack absorber is probably between 300-350pa, therefore operating point P is difficult to avoid this descending branch, although blast has increased, the flow of getting rid of but improves not quite, has increased on the contrary noise.The rotating speed of blower fan under the use state of general lampblack absorber is 1200～1300rpm, if when resistance of pipe system increasing or common flue internal pressure increased, its rotating speed also will increase, this moment, electric efficiency can descend; 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 all the time is as follows: at present, the general rotating speed 1200～1300rpm of cigarette machine under User Status, such as the a-quadrant among Fig. 3, when if resistance of pipe system increasing or common flue internal pressure increase, its rotating speed also will increase, and A point zone can move down, and electric efficiency can descend, when the rotating speed of blower fan is higher, noise is just larger.
Therefore, at present the blower fan system of lampblack absorber is relatively poor to the smoke evacuation of high-drag pipe network, larger impact the suitability of lampblack absorber affect smoke absorption effect under the User Status.And at present, because larger a part of lampblack absorber is when the state of use in the city, oil smoke is except the smoke exhaust pipe of needs by itself, after check (non-return) valve and the 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 decrease that lampblack absorber is carved in use, smoke absorption effect variation, noise is larger simultaneously, if want to improve the air draft effect, present most way improves power of motor exactly, the increasing exhaust flow, though the result who does so often some increase of flow but noise can increase very greatly, attends to one thing and lose sight of another.
Summary of the invention
Primary technical problem to be solved by this invention is to provide a kind of for above-mentioned prior art can also keep than high workload efficient, more low noise lampblack absorber in high-drag pipe network situation.
The technical problem that the present invention further will solve provides a kind of controlling party of above-mentioned lampblack absorber.
The present invention solves the technical scheme that above-mentioned technology matter of utmost importance adopts: this lampblack absorber, comprise casing, the casing below is provided with the oil smoke import, the casing top is provided with the oil smoke outlet, be provided with the blower fan system that air intake vent is communicated with described oil smoke import, air outlet is communicated with described oil smoke outlet in the casing, it 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 the lampblack absorber control system.
Two centrifugal blowers are set, and by the connecting pipe of a bending both are communicated with, so that lampblack absorber is under service condition, blower fan system energy self adaptation is with flow, noise, power consumption can match only operating point, thereby accomplish efficient quiet suction, in addition, blower fan system provided by the invention also has preferably fume purifying function, when the import of oil smoke process oil smoke, when the first centrifugal blower is discharged, the temperature of oil smoke can reduce, and the lower gas of oil smoke the inside freezing point begins to solidify, when arriving the second centrifugal blower, can cover on the impeller and spiral case of the second centrifugal blower, oil smoke on the impeller can be thrown to along with the rotation of centrifugal impeller on the spiral case, derives by spiral case again, reaches the purpose 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 simultaneously less separating force, thereby makes reducing noise.
Two centrifugal blowers are set in the 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 like this is not guarantee that whole lampblack absorber need not to do too large change at the installation thickness direction, only needs to increase the length of lampblack absorber.Can guarantee so the neat and artistic and coordination of whole kitchen finishing, because it is limited often to be used for the space of installation lampblack absorber in the kitchen, can keep previous level at the installation thickness direction, can be that whole lampblack absorber is unlikely to stretch out the kitchen range top, and the distance between lampblack absorber and the 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 all are obliquely installed, angle between the 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 the lampblack absorber whole machine installation, can not affect harmony and the aesthetics of kitchen integral installation yet.
Improve, the slope of the curve each several part of described connecting pipe is identical or approaching with the slope of gas streamline again, and the tube connector resistance that can produce can be as far as possible little like this, produces simultaneously separating force little, more is conducive to reduce noise.
Improve, be provided with the detecting unit that gathers the flue back pressure in the lampblack absorber flue, this detecting unit is connected with the lampblack absorber control system.
The present invention solves the technical scheme that further technical problem adopts: have the lampblack absorber of said structure, the lampblack absorber control system adopts the grading control mode to blower fan system, is specially:
The back pressure critical value is set in the lampblack absorber control system;
When chimney meatus transmitting smoke smooth and easy, when back pressure is less than the back pressure critical value in the flue that the lampblack absorber control system collects, the 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, when back pressure was more than or equal to the back pressure critical value in the flue that the lampblack absorber control system collects, the lampblack absorber control system was exported the second control signal, drives simultaneously the first centrifugal blower and the second centrifugal blower work.
Compared with prior art, the invention has the advantages that: the blast that increases blower fan system by mating two centrifugal blowers, make blower fan system when the state of use, even there is the high-drag pipe network, can have equally larger discharging blast, so emission flow can strengthen also, the rotating speed of two centrifugal blowers need not too high, noise is less, can satisfy the needs of the efficient quiet suction of lampblack absorber.In addition, adopt the advantage of grading control to be environmental protection and energy saving to the wind scale system, effectively utilize resource, so that under mal-condition, the oil smoke function is responded to the smoke evacuation environment automatically, and automatically start the two blower fan systems of series connection.
Description of drawings
Fig. 1 is the structural representation of lampblack absorber in the embodiment of the invention.
Fig. 2 is the use state operating mode schematic diagram of general lampblack absorber;
Fig. 3 is general soot motor efficient and rotation speed relation figure.
The specific embodiment
Embodiment is described in further detail the present invention below in conjunction with accompanying drawing.
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, be provided with in the casing 1 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 the air intake vent of the second 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 the 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 slope of the curve each several part of described connecting pipe is identical or approaching with the slope of gas streamline.
In addition, blower fan system is connected with the lampblack absorber control system, is provided with the detecting unit that gathers the flue back pressure in the lampblack absorber flue, and this detecting unit is connected with the lampblack absorber control system.
The lampblack absorber control system adopts the grading control mode to blower fan system, is specially:
The back pressure critical value is set in the lampblack absorber control system;
When chimney meatus transmitting smoke smooth and easy, when back pressure is less than the back pressure critical value in the flue that the lampblack absorber control system collects, the 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, the flue back pressure increases, when back pressure is more than or equal to the back pressure critical value in the flue that the lampblack absorber control system collects, the lampblack absorber control system is exported the second control signal, drive simultaneously the first centrifugal blower and the second centrifugal blower work, the first centrifugal blower and the second centrifugal blower are worked simultaneously, so that the whole blower fan system of lampblack absorber produces large static pressure, the opposing flue resistance is so that smooth fume exhaust.
The advantage of such classification: environmental protection and energy saving, effectively utilize resource, so that under mal-condition, the oil smoke function is responded to the smoke evacuation environment automatically, and automatically start the two blower fan systems of series connection.
Above-mentioned blower fan system can satisfy 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 efficient 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 efficient, 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
ConnectBe the drag losses of connecting pipe, all the other are with above the same.
3. after the substitution 1.+2., 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, υ is arranged
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, efficient is more approaching because front end resistance is less, therefore following formula streamline any further into:
(P
Tf1+ P
Tf2) η=P
3+ h
Connect+ ρ υ
3 2/ 2
By following formula as can be known, the drag losses of tube connector has much relations to flow and blast, therefore during the design tube connector, make the curvature of curve each several part identical with the gas flow curvature of a curve or approaching, the resistance that tube connector can be produced is as far as possible little, and simultaneously generation separates little, and makes reducing noise, when the tube connector optimal design, h
ConnectUnder User Status, can ignore, therefore following 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 when being zero blower press multiply by efficient, when flow is zero, the load of motor is zero substantially, therefore motor is worked under maximum speed, two centrifugal blowers of the present invention's coupling and the speed discrepancy of former blower fan are few, therefore the blast of blower fan system provided by the invention is the total pressure efficiency addition of two centrifugal blowers, 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), working under the use state when the cigarette machine is, because P=ξ υ
2+ C(ξ=resistance of pipe system coefficient, C are that other user of high-rise building is to its static pressure resistance), ξ can be multiple times than ρ very much, so when blower fan system of the present invention and General System compressor flow equate, then can release P
Tf1+ P
Tf2=P
TfWhen impeller fixedly the time, blower press and rotating speed relation in direct ratio, therefore when the state of use down-off equated, blower fan system rotating speed of the present invention can be less than former blower fan, the user can remove to mate according to top efficiency curve the centrifugal blower of blower fan system of the present invention, allow its rotary speed working in the optimum working zone section, reach flow under User Status greater than former blower fan, noise is really accomplished efficient quiet suction less than former blower fan;
Use lampblack absorber of the present invention compared to existing lampblack absorber preferably fume purifying function to be arranged, when oil smoke process air inlet, when discharging through first order centrifugal blower, the temperature of oil smoke can reduce, and the lower gas of oil smoke the inside freezing point begins to solidify, when arriving second level centrifugal blower, can cover on the impeller and spiral case of second level centrifugal blower, meeting on the impeller is derived by spiral case along with the rotation of centrifugal impeller is thrown on the spiral case again, reaches the purpose of purifying smoke.
Claims (6)
1. lampblack absorber, comprise casing, the casing below is provided with the oil smoke import, and the casing top is provided with the oil smoke outlet, be provided with the blower fan system that air intake vent is communicated with described oil smoke import, air outlet is communicated with described oil smoke outlet in the casing, it 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 the lampblack absorber control system.
2. lampblack absorber according to claim 1, it 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, it is characterized in that: described the first centrifugal blower and the second centrifugal blower all are obliquely installed, and the angle between the line perpendicular to the ground is 20 degree～40 degree.
4. lampblack absorber according to claim 3 is characterized in that: the slope of the gas streamline in the slope of the curve each several part of described connecting pipe and this connecting pipe of flowing through is identical or approaching.
5. according to claim 1 and 2 or 3 or 4 described lampblack absorbers, it is characterized in that: be provided with the detecting unit that gathers the flue back pressure in the lampblack absorber flue, this detecting unit is connected with the lampblack absorber control system.
6. control method of lampblack absorber as claimed in claim 5, it is characterized in that: the lampblack absorber control system adopts the grading control mode to blower fan system, is specially:
The back pressure critical value is set in the lampblack absorber control system;
When chimney meatus transmitting smoke smooth and easy, when back pressure is less than the back pressure critical value in the flue that the lampblack absorber control system collects, the 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, when back pressure was more than or equal to the back pressure critical value in the flue that the lampblack absorber control system collects, the lampblack absorber control system was exported the second control signal, drives simultaneously the first centrifugal blower and the second centrifugal blower work.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310248436.8A CN103363563B (en) | 2013-06-21 | 2013-06-21 | A kind of lampblack absorber and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310248436.8A CN103363563B (en) | 2013-06-21 | 2013-06-21 | A kind of lampblack absorber and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN103363563A true CN103363563A (en) | 2013-10-23 |
| CN103363563B CN103363563B (en) | 2016-05-25 |
Family
ID=49365494
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|---|---|---|---|
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103629721A (en) * | 2013-12-20 | 2014-03-12 | 谢卓 | Household smoke-free range hood |
| CN104121615A (en) * | 2014-07-31 | 2014-10-29 | 章志军 | Air purification functional box |
| CN104949172A (en) * | 2014-03-27 | 2015-09-30 | 宁波方太厨具有限公司 | Serial double-fan-type range hood |
| CN104949175A (en) * | 2014-03-27 | 2015-09-30 | 宁波方太厨具有限公司 | Tandem double-fan structure for extractor hood |
| CN104949171A (en) * | 2014-03-27 | 2015-09-30 | 宁波方太厨具有限公司 | Extractor hood provided with lengthened fan outer cover |
| CN106051870A (en) * | 2016-07-22 | 2016-10-26 | 宁波方太厨具有限公司 | Top suction and side suction mixed range hood |
| CN108006761A (en) * | 2017-06-30 | 2018-05-08 | 宁波方太厨具有限公司 | A kind of frequency conversion range hood and its method for controlling frequency conversion |
| CN109595632A (en) * | 2017-09-30 | 2019-04-09 | 宁波方太厨具有限公司 | A kind of near-suction type oil smoke suction machine |
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| CN106051870A (en) * | 2016-07-22 | 2016-10-26 | 宁波方太厨具有限公司 | Top suction and side suction mixed range hood |
| CN108006761A (en) * | 2017-06-30 | 2018-05-08 | 宁波方太厨具有限公司 | A kind of frequency conversion range hood and its method for controlling frequency conversion |
| CN109595632A (en) * | 2017-09-30 | 2019-04-09 | 宁波方太厨具有限公司 | A kind of near-suction type oil smoke suction machine |
| CN109595632B (en) * | 2017-09-30 | 2023-11-17 | 宁波方太厨具有限公司 | Near-suction type range hood |
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|---|---|
| CN103363563B (en) | 2016-05-25 |
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