CN113108337B - Air volume control method and device for range hood - Google Patents
Air volume control method and device for range hood Download PDFInfo
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- CN113108337B CN113108337B CN202010157408.5A CN202010157408A CN113108337B CN 113108337 B CN113108337 B CN 113108337B CN 202010157408 A CN202010157408 A CN 202010157408A CN 113108337 B CN113108337 B CN 113108337B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2021—Arrangement or mounting of control or safety systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
Abstract
The invention discloses an air quantity control method and device of a range hood, wherein the range hood comprises a fan, and the air quantity control method comprises the following steps: acquiring the frequency of a fan and the outlet full pressure of the fan, and acquiring a first fan air quantity value and the public flue pressure according to the fan frequency and the outlet full pressure of the fan; and if the air quantity value of the first fan exceeds the set range of the air quantity set value, determining the target frequency of the fan under the common flue pressure according to the air quantity value of the first fan and the air quantity set value, and adjusting the fan. According to the invention, the adjustment frequency of the smoke machine is controlled through smoke machine outlet full-pressure feedback sensing to realize air volume adjustment, and the air volume adjustment of the fan can be realized under the pressure of the common flue no matter how the pressure of the common flue of the environment where the smoke machine is located changes, so that the actual effective air volume can not change along with the change of the external pressure, the effective air volume required by users under different working conditions is constant, the constant air volume is realized, and the smoking effect is improved.
Description
Technical Field
The invention relates to a smoke treatment technology, in particular to an air volume control method and device of a range hood.
Background
The lampblack absorber is installed in kitchen range upper portion or lateral part, and the integration has the fan, and the operation process of current lampblack absorber makes the kitchen range top form the negative pressure zone for the high-speed rotation of fan, inhales indoor oil smoke inside the lampblack absorber, and oil smoke gas is through purifying and separating for oil dripping and flue gas, and oil dripping is collected the oil cup, and the flue gas is discharged along the flue.
The range hood is provided with a plurality of gears, each gear corresponds to a set air volume, and the air volume of the range hood on the market at present under the nominal gear is an ideal value tested and set under laboratory conditions. In the actual use process, because the resistance of the smoke pipe and the pressure of the common flue exist, the actual effective air volume of the same product and the same gear under different use environments is different. If the pressure of the common flue is higher, the actual effective air volume is lower, the phenomena of oil smoke escape and no smoking can occur, and even the oil smoke of other users flows backwards. The use requirements of users cannot be met.
Disclosure of Invention
The invention provides an air volume control method and device of a range hood, which are used for meeting the use requirements under different working conditions.
The invention provides an air volume control method of a cigarette machine, wherein the cigarette machine comprises a fan, and the air volume control method comprises the following steps:
acquiring the frequency of the fan and the outlet full pressure of the fan, and acquiring a first fan air quantity value and a common flue pressure according to the fan frequency and the outlet full pressure of the fan;
and if the first fan air volume value exceeds the set range of the air volume set value, determining the target frequency of the fan under the pressure of the common flue according to the first fan air volume value and the air volume set value, and adjusting the fan.
The invention also provides an air volume control device of a cigarette machine, the cigarette machine comprises a fan, and the air volume control device comprises:
the operation parameter acquisition module is used for acquiring the frequency of the fan and the outlet full pressure of the fan, and acquiring a first fan air volume value and a common flue pressure according to the fan frequency and the outlet full pressure of the fan;
and the smoke machine air volume adjusting module is used for determining the target frequency of the fan under the pressure of the common flue and adjusting the fan according to the first fan air volume value and the air volume set value if the first fan air volume value exceeds the set range of the air volume set value.
According to the method, the frequency of a fan and the outlet full pressure of the fan are obtained, and a first fan air volume value and the public flue pressure are obtained according to the frequency of the fan and the outlet full pressure of the fan; if the air quantity value of the first fan exceeds the set range of the air quantity set value, the fact that the public flue pressure of the environment where the range hood is located at the current moment has a large influence on the output air quantity of the range hood is shown, the target frequency required by the fan is calculated according to the first fan air quantity value obtained at the current moment and the preset air quantity set value, after adjustment, under the public flue pressure at the current moment, the effective air quantity output by the fan can be in the set range of the air quantity set value, and constant air quantity is achieved. Therefore, in the process that a user uses the cigarette machine, no matter how the load of the environment where the cigarette machine is located changes, the air volume regulation of the fan can be realized, the actual effective air volume can not change along with the change of the external load, the effective air volume meeting the user demands under different working conditions is constant, the constant air volume is realized, and the smoking effect is improved.
Drawings
While the drawings used in the description of the embodiments or prior art will be described briefly to more clearly illustrate the embodiments or prior art, it is obvious that the drawings in the description will be some specific embodiments of the present invention, and it will be obvious to those skilled in the art that the basic concepts of the device structure, the driving method and the manufacturing method disclosed and suggested by the various embodiments of the present invention can be extended and extended to other structures and drawings without doubt being within the scope of the claims of the present invention.
Fig. 1 is a schematic diagram of an air volume control method of a range hood according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an air volume control method of a range hood according to an embodiment of the present invention;
figure 3 is a schematic illustration of an intermediate load curve of a cigarette machine before optimization;
figure 4 is a schematic illustration of an optimized cigarette machine intermediate load curve;
fig. 5 is a schematic view of an air volume control device of a range hood according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail and completely by embodiments with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the basic idea disclosed and suggested by the embodiments of the present invention, fall within the scope of protection of the present invention.
Referring to fig. 1, a schematic diagram of an air volume control method of a range hood according to an embodiment of the present invention is shown. The range hood described in this embodiment includes a fan and also includes an air volume control device that executes an air volume control method, and the air volume control device can be selected to be implemented in a software and/or hardware manner and configured for use in the range hood. For example, the air volume control device is integrated in a main controller of the range hood, so that the intelligence of the control of the range hood is realized.
The air quantity control method of the range hood provided by the embodiment comprises the following steps:
and 110, acquiring the frequency of the fan and the outlet full pressure of the fan, and obtaining a first fan air volume value and a common flue pressure according to the fan frequency and the outlet full pressure of the fan.
As mentioned above, the acquired parameters are the operating parameters of the components of the cigarette making machine at the present moment, and the cigarette making machine includes a blower, which may also be understood as a motor in the cigarette making machine. The frequency of the fan is the actual frequency of the fan collected at the current moment, and the actual frequency of the fan is influenced by the pressure of the smoke machine and possibly changes, so that the frequencies of the fans collected at different moments are possibly different. The frequency of the fan determines the rotating speed of the fan, and the air volume control device can determine the rotating speed of the fan according to the actual frequency of the fan. The outlet full pressure of the fan is the air pressure of the fan, the outlet full pressure of the fan is the actual pressure of the outlet of the fan collected at the current moment, the outlet full pressure of the fan and the rotating speed of the fan influence the air quantity generated by the fan, the air quantity control device can obtain an air quantity actual value according to the outlet full pressure of the fan and the actual rotating speed of the fan, and the air quantity actual value at the current moment is the first fan air quantity value. In addition, the difference between the full pressure of the fan outlet and the common flue pressure is consumed on the branch pipe of the smoke machine, so that the common flue pressure can be obtained according to the full pressure of the fan outlet and the first fan air volume value.
And step 120, if the air volume value of the first fan exceeds the set range of the air volume set value, determining the target frequency of the fan under the common flue pressure according to the air volume value of the first fan and the air volume set value, and adjusting the fan.
In actual use, the performance of the range hood is limited by load, the load changes along with the change of the use environment, the load of the range hood is just the pressure of a public flue under the environment where the range hood is located, the public flue is a public smoke exhaust channel in a building, the higher the pressure of the public flue is, the worse the working condition environment where the range hood is located is shown, the lower the pressure of the public flue is, and the better the working condition environment where the range hood is located is shown. Through detection, the common flue pressure of the smoke machines on lower floors is usually higher than that of the smoke machines on higher floors, and the common flue pressure is influenced by factors of the full pressure of a fan outlet and the actual air volume value of the smoke machines of a user. Based on that, in the embodiment, under the condition that the common flue pressure is determined, the target frequency of the fan is determined according to the first fan air volume value and the air volume set value, and the fan is adjusted, so that the adjusted air volume is within the set range of the air volume set value.
At the current moment, the public flue pressure at the current moment is obtained through the step 110, the public flue pressure is basically stable within a certain time length, the target frequency is determined according to the first fan air volume value and the air volume set value at the current moment based on the public flue pressure determined at the current moment, and when the smoke machine is adjusted, the adjusted parameters take the influence of the public flue pressure at the current moment into consideration, the output air volume after adjustment is more accurate, and the smoking effect of the smoke machine can be improved. The selectable air quantity control device is provided with an air quantity set value, the range formed by the up-and-down floating error of the air quantity set value is the set range of the air quantity set value, the air quantity set value is an ideal constant air quantity value which is predetermined in the actual load range of a user, and for a smoke machine, the user can realize ideal constant air quantity in the actual use no matter how the pressure of an external common flue changes.
As described above, the air volume control device detects whether the first fan air volume value at the current time is within the setting range of the air volume setting value, if so, it indicates that the difference between the first fan air volume value at the current time and the ideal air volume setting value is small, and the effective output air volume of the range hood can be considered as normal, and the process returns to step 110.
If the difference value exceeds the set range, the difference value between the air quantity value of the first fan and the air quantity set value at the current moment is larger, and the effective output air quantity of the range hood is obviously influenced by the pressure of the common flue; therefore, the target frequency required by the fan under the current common flue pressure is calculated according to the first fan air volume value and the air volume set value obtained at the current moment, the fan is adjusted according to the target frequency, the effective air volume of the adjusted fan is in the set range of the air volume set value, and then the step 110 is returned to execute the control flow again. The effective air quantity output by the cigarette machine after adjustment is within the set range of the air quantity set value can be understood as the constant air quantity of the cigarette machine.
Therefore, no matter how the load of the environment where the range hood is located changes, the range hood can automatically adjust the frequency of the fan according to the changed public flue pressure so that the effective output air volume of the range hood is within the set range of the air volume set value, and constant air volume is achieved.
As mentioned above, for the cigarette making machine with poor working condition, the target frequency obtained by the formula reverse operation is greater than the actual frequency of the fan collected at the current moment, so that the fan of the cigarette making machine is controlled to output enough rotating speed, thereby ensuring that the effective air volume is not reduced and improving the smoking effect. For the cigarette machine that the operating mode is better, the target frequency that obtains according to formula reverse operation is less than the actual frequency of the fan of gathering at the present moment, so the fan of control cigarette machine can reduce the rotational speed, when guaranteeing the smoking effect, can also the noise reduction, promotes user experience. The smoking effect of not co-altitude floor installation cigarette machine has been considered to the constant-air-volume cigarette machine, is guaranteeing to satisfy each floor user and uses the basis on, reduces the noise of cigarette machine in the high floor user family, improves the smoking effect of cigarette machine in the low floor user family simultaneously.
In the embodiment, the frequency of the fan and the outlet full pressure of the fan are obtained, and the first fan air volume value and the public flue pressure are obtained according to the frequency of the fan and the outlet full pressure of the fan; if the air quantity value of the first fan exceeds the set range of the air quantity set value, the fact that the public flue pressure of the environment where the range hood is located at the current moment has a large influence on the output air quantity of the range hood is shown, the target frequency required by the fan is calculated according to the first fan air quantity value obtained at the current moment and the preset air quantity set value, after adjustment, under the public flue pressure at the current moment, the effective air quantity output by the fan can be in the set range of the air quantity set value, and constant air quantity is achieved. Consequently, use the cigarette machine in-process at the user, no matter how the load of the environment that the cigarette machine is located changes, the homoenergetic realizes the air regulation to the fan for the actual effective amount of wind can not change along with external load's change, and the effective amount of wind that satisfies user's demand under the different work condition is invariable, realizes the constant amount of wind, has improved the smoking effect.
Illustratively, on the basis of the foregoing technical solution, as shown in fig. 2, the operation of step 110 may be selected, the frequency of the fan and the full outlet pressure of the fan are obtained, and the first fan air volume value and the common flue pressure are obtained according to the fan frequency and the full outlet pressure of the fan, which specifically includes:
and step 111, acquiring an actual frequency f0 of the fan, and obtaining an actual rotating speed n0 of the fan according to a formula (1), wherein n is mu (f) (1). The actual frequency f0 of the fan is collected at the current time t 0. In a mathematical model of a smoke machine, the rotating speed and the frequency of the fan are in a linear relation and have a functional relation shown in formula (1), and the actual rotating speed n0 of the fan at the current moment can be calculated according to the actual frequency f0 at the current moment.
113, according to the full pressure P of the outlet of the fanT0And a first fan air quantity value Q0 according to a formula(3) A common flue pressure P0 is obtained,
wherein xi is the resistance coefficient of the branch pipe of the cigarette machine, and A is the sectional area of the branch pipe of the cigarette machine.
Obtaining the fan outlet full pressure P at the current moment according to the steps 112 and 113T0And a first fan air flow value Q0. In the mathematical model of the smoke machine, the difference between the full pressure of the fan outlet and the pressure of the common flue is consumed on the branch pipe of the smoke machine, and the equation is formula (3). Based on the equation relationship, the full pressure P of the fan outlet is knownT0And the first fan air volume value Q0, the common flue pressure P0 of the range hood at the current moment can be calculated according to the formula (3).
As shown in fig. 2, the operation of optional step 120 is to determine a target frequency of the fan under the common flue pressure according to the first fan air volume value and the air volume setting value, and adjust the fan, which specifically includes:
As described above, it is known that the common flue pressure P0 and the first fan air volume value Q0 of the environment where the range hood is located are obtained at the present time, and the preset air volume setting value Q is obtainedsetThen, according to the formula (3), the preset value Q of the air volume reached at the current moment can be calculatedsetFan outlet full pressure requirement value PT1，PT1Is characterized in that the set value Q of the air volume is reached under the common flue pressure P0 at the current momentsetThe required fan outlet air pressure.
The wind pressure P of the outlet of the fan at the current momentT0The first fan air quantity value Q0 and the common flue pressure P0 satisfy the formula (3) PT0-P0＝αQ02If P0 is equal to PT0-αQ02. Then the set value Q of the air volume is reached at the current momentsetRequired fan outlet wind pressure, i.e. fan outlet full pressure requirement value PT1The wind rate is setConstant value QsetFan outlet full pressure required value PT1And the common flue pressure P0 satisfies formula (3) PT1-P0＝αQ2 setThen P isT1＝P0+αQ2 set。
Thus, P is knownT1＝PT0-αQ02+αQ2 set＝PT0+α(Q2 set-Q02) (4) thus eliminating the influence of the common flue pressure P0 at the present moment, the fan outlet full pressure requirement value PT1The change is only with the wind pressure P of the fan outlet at the current momentT0And a set value Q of air quantitysetAnd the first fan air volume value Q0 at the current moment is related, so that the constant air volume can be realized no matter how the external common flue pressure changes. Based on the method, the wind pressure P of the outlet of the fan at the moment of the formula is directly acquired in the subsequent air volume control processT0A first fan air volume value Q0 and a preset known air volume set value QsetDirectly obtaining the required fan outlet full-pressure required value P according to the formula (4)T1The air quantity control process is simple.
As described above, at the common flue pressure P0 at the present time, it is known that the air volume set value Q is reachedsetThe required fan outlet full-voltage requirement value is PT1Then Q can be obtained according to equation (2)set＝G(n1，PT1) Wherein n1 represents that the set value Q of the air volume is reached under the common flue pressure P0 at the current momentsetSum-pressure fan outlet full-pressure requirement value PT1When the required fan speed is needed, n1 is G-1 Qset(PT1)。
The rotating speed of the fan and the frequency of the fan meet the formula (1), and the air quantity set value Q is reached under the known common flue pressure P0 at the current momentsetSum-pressure fan outlet full-pressure requirement value PT1If the required fan speed is n1, then n1 ═ μ (f1) and f1 ═ μ (f1) can be obtained-1(n1) wherein f1 is characterized in that the set air quantity value Q is reached under the common flue pressure P0 at the current momentsetSum-pressure fan outlet full-pressure requirement value PT1The required fan demand frequency, namely the target frequency.
Adjusting the frequency of the fan according to f1 to enable the frequency of the fan to be equal to the target frequency f1, and after the fan operates according to the adjusted target frequency, the actual air quantity output by the range hood can be at an air quantity set value QsetWithin the set range, constant air volume is realized, and the actual effective air volume of the range hood can not change along with the change of external loads.
As shown in fig. 2, the optional air volume control method further includes: and if the air volume value of the first fan is within the set range of the air volume set value or the fan is regulated according to the target frequency of the fan, restarting the air volume control process after setting the time length. If the first fan air volume value is within the set range of the air volume set value at the current moment, the actual effective air volume output by the range hood is close to the ideal air volume, the smoking effect meets the user requirement, and the process restarts from the step 110 at the next moment t0+ delta t. Alternatively, after the fan has been frequency adjusted at step 120, it is restarted from step 110 after a set time period Δ t.
It can be understood that the set time length delta t can be very small (for example, less than 1 second), and the real-time adjustment of the air quantity of the whole range hood is realized, so that the range hood is always at the air quantity set value Q in the running processsetWithin the set range of (2), user experience is improved. The set time length delta t can be relatively longer (for example, about 2 minutes), timing adjustment of the air quantity of the smoke machine is achieved, the smoke machine is adjusted in timing mode after certain aggregation of smoke is generated, and power consumption can be reduced.
The following description will be made by comparing the existing cigarette making machine with the cigarette making machine described in the embodiments of the present invention.
The air volume that lampblack absorber on the existing market set for is all according to the ideal environment of laboratory, does not consider the influence of in-service use ambient pressure to the air volume, and the user is at the in-process of in-service use cigarette machine, and the actual effective air volume often is on the low side, and the lower floor user is, and public flue pressure is big more, and the actual effective air volume is low more, and the oil smoke escape, the no smoking phenomenon can appear, and other users' oil smoke can appear even and flow backward, reduces user experience. To this problem, this embodiment controls the external pressure's of cigarette machine curve, combines user's in-service use scene, adjusts external pressure's middle load characteristic curve through air volume control procedure, and the effective amount of wind that can satisfy user's demand under the different operating modes is invariable, and the user is in the use, and the effective amount of wind of reality can not reduce along with external load's change, has solved the problem that the cigarette machine does not smoke and flows backward.
Among the prior art, through detecting external load change on the lampblack absorber, and then let the lampblack absorber move different gears, realize the increase amount of wind through the mode of increase wind pressure. The defects of gear switching are that the air volume after adjustment is far larger than the required effective air volume only by increasing the output power and the rotating speed of the motor, so that the noise of the user is large and the experience feeling is poor; or the adjusted air volume can not meet the effective air volume required by a user, so that the smoke suction effect of the range hood is not ideal, and a large amount of oil smoke remains.
In the embodiment of the invention, the frequency of the range hood is adjusted, the characteristic curve of the intermediate load of the range hood is optimized, the constant effective air output of the range hood is ensured, the smoking problem of a user is solved, the noise is reduced, and the user experience is improved.
Referring to figure 3, a graph of the performance of a prior art cigarette making machine is shown. The ordinate is the actual load of the user, namely the pressure of the public flue, the abscissa is the actual output air quantity of the cigarette machine, the pressure of the point A and the air quantity are ideal points for propaganda of the cigarette machine, and obviously, the larger the pressure of the public flue is, the smaller the actual output air quantity of the cigarette machine is, the smaller the pressure of the public flue is, and the larger the actual output air quantity of the cigarette machine is. The reason for this is that the actual operating mode of the cigarette machine in different users' homes is different because of reasons such as flue pipe installation, the public flue position of different floors, cigarette machine simultaneous use opening rate, etc. The actual output air volume of the range hood with poor working conditions is less than the air volume value meeting the user requirements, and the range hood has poor smoking effect and does not smoke. The actual output air volume of the good cigarette machine of operating mode will be greater than the air volume value that satisfies user's demand, and the smoking effect does not have the problem, but the air volume is too big, causes the noise big.
Referring to fig. 4, the performance curve of the optimized constant effective air volume smoke machine is shown. The constant air volume output by the cigarette machine is realized, obviously, the effective air volume output by the cigarette machine is ensured to be constant no matter how the external pressure of the environment where the cigarette machine is located changes, so that the actual effective air volume output by the cigarette machine can not change along with the change of external loads, the effective air volume required by users under different working conditions is constant, and the constant air volume is realized. The specific process is as follows: the air quantity and air pressure parameters are mainly determined by the rotating speed of the fan, the rotating speed of the fan is related to the current and power parameters of the fan, when the external load changes, the current and power of the fan change, the characteristics of the fan change along with the change, the program of the adjusting device judges the air quantity change according to the parameter change, and the new current and power parameters are input into the fan according to the change to correct the change of the air quantity, so that the constant effective air quantity in a certain range is ensured.
After optimization, preferably, the range hood is controlled to keep constant air volume within the user actual load range interval 1, so that the effective air volume output by the range hood is within the user actual air volume range interval 2, the user actual load range interval 1 is the maximum range of the load of users in high and low floors in the region, and the user actual air volume range interval 2 is the set range of the air volume set value. As shown in fig. 4, under the external pressure corresponding to the point B, the air volume of the optimized curve is greater than the original actual output air volume, that is, for the range hood with poor working condition, the obtained target frequency is greater than the actual frequency at the collection time, so that the rotating speed of the fan can be increased to enable the fan to output sufficient rotating speed, and the output effective air volume is increased to enable the output effective air volume to reach the set range of the air volume set value. As shown in figure 4, under the load that C point corresponds, the curved amount of wind after optimizing is less than the actual output amount of wind originally, and for better operating mode cigarette machine promptly, the target frequency who reachs is less than the actual frequency of gathering constantly, then can reduce motor speed, reduces the effective amount of wind of output and makes it be located the settlement within range of amount of wind set point, so can be when guaranteeing cigarette machine smoking effect, noise reduction, promotion user experience.
It should be noted that the load and the common flue pressure can be said to be equivalent concepts, and the fan air pressure is output according to the magnitude of the common flue pressure in the user's home, and the common flue pressure and the fan air pressure have an absolute correlation, so fig. 3 and 4 can also be regarded as the optimized front-back relationship between the fan air pressure and the air volume. As shown in fig. 3, the wind pressure and the wind volume at the point a are ideal values advertised by the range hood, but actually, under a large fan wind pressure, the actual output wind volume of the range hood cannot reach the ideal values. As shown in FIG. 4, the cigarette machine can keep constant air volume no matter under the condition of large fan air pressure or small fan air pressure after optimization as long as the fan air pressure is in the actual air pressure use range.
The embodiment of the invention realizes constant air volume through the constant air volume control logic, and can understand that the parameter control logic can also be applied to other products of the same type. Those skilled in the art will appreciate that the amount of residential kitchen exhaust air is selected with the goal of meeting kitchen exhaust air requirements. The exhaust air volume is too small, the oil smoke can escape, and the kitchen has peculiar smell. However, it is not preferable that the larger the size is, the larger the amount of exhaust air is, and the more the power consumption and noise of the fan in the kitchen will be increased. According to the embodiment of the invention, the fan characteristic curve is optimized through program control according to the actual use requirements of users, on the basis of ensuring that the use requirements of users on each floor are met, the air quantity of high-rise users is reduced, the noise is reduced, and meanwhile, the smoking effect of low-rise users is ensured.
The embodiment of the invention also provides an air volume control device of a range hood, the range hood comprises a fan, and the air volume control device comprises the following components as shown in figure 5: the operation parameter acquisition module 10 is used for acquiring the frequency of the fan and the outlet full pressure of the fan, and acquiring a first fan air volume value and a common flue pressure according to the fan frequency and the outlet full pressure of the fan; and the range hood air volume adjusting module 20 is used for determining the target frequency of the fan under the pressure of the common flue according to the first fan air volume value and the air volume set value and adjusting the fan if the first fan air volume value exceeds the set range of the air volume set value.
The optional operation parameter obtaining module 10 includes:
an operation parameter acquisition submodule for acquiring the actual frequency f0 of the fan and the full pressure P of the fan outletT0；
The operation parameter operation submodule is used for obtaining the actual rotating speed n0 of the fan according to a formula (1), obtaining the first fan air quantity value Q0 according to a formula (2), and obtaining the full pressure P of the fan outlet according to the full pressure PT0And the first fan air quantity value Q0, and obtaining the common flue pressure P0 according to a formula (3);
n＝μ(f) (1)；
Q＝G(n，PT) (2)；
wherein xi is the resistance coefficient of the branch pipe of the cigarette machine, and A is the sectional area of the branch pipe of the cigarette machine.
Optional cigarette machine air regulation module 20 includes:
a demand parameter operation submodule for calculating the air volume according to the first fan air volume value Q0 and the air volume set value QsetAnd the common flue pressure P0, and obtaining a fan outlet full pressure demand value P according to the formula (3)T1，PT1＝P0+αQset 2＝PT0+α(Q2 set-Q02) Then according to the air quantity set value QsetAnd the fan outlet full pressure requirement value PT1Obtaining the required rotating speed n1 of the fan, wherein n1 is G-1 Qset(PT1) And obtaining a target frequency f1 of the fan according to the required rotating speed n1 of the fan, wherein f1 is mu-1(n1)；
And the target parameter adjusting submodule is used for adjusting the operating frequency of the fan to the target frequency.
Optionally, the air volume control device further comprises: and the timing control module 30 is configured to, if the first fan air volume value is within the set range of the air volume set value or the fan is adjusted according to the target frequency of the fan, restart the air volume control process after a set time length.
Accordingly, the control logic of the frequency conversion scheme of the air volume control device is as follows:
step 1: acquiring a frequency f0 at a time t0, and obtaining the fan rotating speed n0 at the time as mu (f0) according to the formula (1);
step 2: collect fan export full pressure P this momentT0The fan airflow Q0 at this time is G (n0, P) according to equation (2)T0) (ii) a Comparing Q0 with the air volume set value Qset:
if the difference value of the two is within the set deviation, the Step is ended, and the Step is restarted from Step1 at the next time t0+ delta t; if the difference value of the two values is outside the set deviation area, Step3 is carried out;
step 3: the common flue pressure P0 at this time is calculated from equation (3) to be PT0-αQ02Thus, the required pressure P to the air flow set value Qset at the outside pressure P0 is obtainedT1＝P0+αQset 2；
Step 4: determining the required rotating speed of the fan under the external pressure as n1 ═ G-1 Qset(PT1) Further, from (1), the target value of the fan frequency adjustment is obtained as f1 ═ μ-1(n1)；
Step 5: at the next time t0+ Δ t, it restarts at Step 1.
In this embodiment, use the cigarette machine in-process at the user, no matter how the load of the environment that the cigarette machine is located changes, all can realize the air regulation to the fan for the effective amount of wind of reality can not change along with the change of external load, and the effective amount of wind that satisfies user demand under the different work condition is invariable, realizes the constant amount of wind, has improved the smoking effect.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (4)
1. The air volume control method of the range hood is characterized in that the range hood comprises a fan, and the air volume control method comprises the following steps:
acquiring the frequency of the fan and the outlet full pressure of the fan, and acquiring a first fan air volume value and a common flue pressure according to the fan frequency and the outlet full pressure of the fan;
if the first fan air volume value exceeds the set range of the air volume set value, determining the target frequency of the fan under the pressure of the common flue according to the first fan air volume value and the air volume set value, and adjusting the fan;
acquiring the frequency of the fan and the outlet full pressure of the fan, and obtaining a first fan air volume value and a public flue pressure according to the fan frequency and the outlet full pressure of the fan, wherein the method comprises the following steps:
acquiring the actual frequency f0 of the fan, and acquiring the actual rotating speed n0 of the fan according to a formula (1);
obtaining the total pressure P of the outlet of the fanT0Obtaining the first fan air quantity value Q0 according to a formula (2);
according to the full pressure P of the outlet of the fanT0And the first fan air quantity value Q0, and obtaining the common flue pressure P0 according to a formula (3);
n＝μ(f) (1)；
Q＝G(n，PT) (2)；
wherein xi is the resistance coefficient of the branch pipe of the cigarette machine, and A is the sectional area of the branch pipe of the cigarette machine; determining the target frequency of the fan under the pressure of the common flue according to the first fan air volume value and the air volume set value, and adjusting the fan, wherein the method comprises the following steps:
according to the first fan air quantity value Q0 and the air quantity set value QsetAnd the common flue pressure P0, and obtaining a fan outlet full pressure demand value P according to the formula (3)T1，PT1＝P0+αQset 2＝PT0+α(Q2 set-Q02)；
According to the set value Q of the air volumesetAnd the fan outlet full pressure requirement value PT1Obtaining the required rotating speed n1 of the fan, wherein n1 is G-1 Qset(PT1) And obtaining a target frequency f1 of the fan according to the required rotating speed n1 of the fan, wherein f1 is mu-1(n1) and adjusting the fan.
2. The air volume control method according to claim 1, characterized by further comprising: and if the first fan air volume value is within the set range of the air volume set value or the fan is regulated according to the target frequency of the fan, restarting the air volume control process after setting the time length.
3. The utility model provides an air volume controlling means of cigarette machine which characterized in that, the cigarette machine includes the fan, and this air volume controlling means includes:
the operation parameter acquisition module is used for acquiring the frequency of the fan and the outlet full pressure of the fan, and acquiring a first fan air volume value and a common flue pressure according to the fan frequency and the outlet full pressure of the fan;
the range hood air volume adjusting module is used for determining the target frequency of the fan under the pressure of the common flue according to the first fan air volume value and the air volume set value and adjusting the fan if the first fan air volume value exceeds the set range of the air volume set value;
the operation parameter acquisition module comprises:
an operation parameter acquisition submodule for acquiring the actual frequency f0 of the fan and the full pressure P of the fan outletT0；
Operation parameter calculationThe submodule is used for obtaining the actual rotating speed n0 of the fan according to a formula (1), obtaining the first fan air volume value Q0 according to a formula (2), and obtaining the full pressure P of the fan outlet according to the full pressure PT0And the first fan air quantity value Q0, and obtaining the common flue pressure P0 according to a formula (3);
n＝μ(f) (1)；
Q＝G(n，PT) (2)；
wherein xi is the resistance coefficient of the branch pipe of the cigarette machine, and A is the sectional area of the branch pipe of the cigarette machine;
the cigarette machine air volume adjusting module comprises:
a demand parameter operation submodule for calculating the air volume according to the first fan air volume value Q0 and the air volume set value QsetAnd the common flue pressure P0, and obtaining a fan outlet full pressure demand value P according to the formula (3)T1，PT1＝P0+αQset 2＝PT0+α(Q2 set-Q02) Then according to the air quantity set value QsetAnd the fan outlet full pressure requirement value PT1Obtaining the required rotating speed n1 of the fan, wherein n1 is G-1 Qset(PT1) And obtaining a target frequency f1 of the fan according to the required rotating speed n1 of the fan, wherein f1 is mu-1(n1)；
And the target parameter adjusting submodule is used for adjusting the operating frequency of the fan to the target frequency.
4. The air volume control device according to claim 3, characterized by further comprising: and the timing control module is used for adjusting the fan if the first fan air volume value is within the set range of the air volume set value or according to the target frequency of the fan, and restarting the air volume control process after the set time length.
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| CN202010157408.5A CN113108337B (en) | 2020-03-09 | 2020-03-09 | Air volume control method and device for range hood |
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| CN102589025B (en) * | 2012-02-17 | 2014-06-11 | 宁波方太厨具有限公司 | Fan speed adaptive regulation device of range hood and control method thereof |
| CN105066209B (en) * | 2015-08-17 | 2017-06-20 | 广东美的厨房电器制造有限公司 | Cigarette machine system and its control method |
| CN107314507B (en) * | 2017-07-20 | 2019-08-23 | 杭州老板电器股份有限公司 | Blower control method and device |
| CN109631120B (en) * | 2019-01-09 | 2020-02-07 | 杭州老板电器股份有限公司 | Centralized variable-frequency smoke discharge control method and device |
| CN110375362B (en) * | 2019-06-28 | 2020-08-11 | 宁波方太厨具有限公司 | Constant air volume control method for range hood |
| CN110500625B (en) * | 2019-07-24 | 2021-02-26 | 宁波方太厨具有限公司 | Building outdoor auxiliary smoke discharging and purifying system and control method thereof |
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