CN113108333B - Wind pressure control method and device for range hood - Google Patents
Wind pressure control method and device for range hood Download PDFInfo
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- CN113108333B CN113108333B CN202010157027.7A CN202010157027A CN113108333B CN 113108333 B CN113108333 B CN 113108333B CN 202010157027 A CN202010157027 A CN 202010157027A CN 113108333 B CN113108333 B CN 113108333B
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention discloses a wind pressure control method and a device of a cigarette machine, wherein the cigarette machine comprises a fan, and the wind pressure control method comprises the following steps: acquiring the frequency of a fan and the outlet air speed of the fan, and determining an actual air quantity value, the outlet air pressure of the fan and the pressure of a common flue according to the frequency of the fan and the outlet air speed of the fan; and if the wind pressure of the outlet of the fan exceeds the set range of the wind pressure set value, calculating the target frequency of the fan under the pressure of the common flue according to the wind pressure of the outlet of the fan, the wind pressure set value and the actual value of the wind volume, and adjusting the fan. In the invention, the smoke machine is controlled by wind speed feedback sensing to realize constant effective wind pressure.
Description
Technical Field
The invention relates to a smoke treatment technology, in particular to a method and a device for controlling wind pressure 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 has set wind pressure and wind volume, and the nominal wind pressure and wind volume of the range hood on the market at present are ideal values tested and set under laboratory conditions. However, in the actual use process, because loads such as the resistance of the smoke pipe exist, the actual effective wind pressure of the product under different use environments is different, so that the smoke exhaust effect is poor, and the use requirements of users cannot be met.
Disclosure of Invention
The invention provides a method and a device for controlling wind pressure of a cigarette machine, which are used for effectively controlling the wind pressure.
The invention provides a wind pressure control method of a cigarette machine, wherein the cigarette machine comprises a fan, and the wind pressure control method comprises the following steps:
acquiring the frequency of the fan and the outlet air speed of the fan, and determining an actual air quantity value, the outlet air pressure of the fan and the pressure of a common flue according to the frequency of the fan and the outlet air speed of the fan;
and if the wind pressure of the fan outlet exceeds the set range of the wind pressure set value, calculating the target frequency of the fan under the pressure of the common flue according to the wind pressure of the fan outlet, the wind pressure set value and the actual wind volume value, and adjusting the fan.
The invention also provides a wind pressure control device of a cigarette machine, the cigarette machine comprises a fan, and the wind pressure control device comprises:
the operation parameter acquisition module is used for acquiring the frequency of the fan and the outlet air speed of the fan, and determining an actual air quantity value, the outlet air pressure of the fan and the pressure of a common flue according to the frequency of the fan and the outlet air speed of the fan;
and the smoke machine parameter adjusting module is used for calculating the target frequency of the fan under the pressure of the common flue and adjusting the fan according to the wind pressure of the fan outlet, the wind pressure set value and the actual wind volume value if the wind pressure of the fan outlet exceeds the set range of the wind pressure set value.
According to the invention, after the wind pressure is adjusted according to the wind pressure control program, for the range hood with poor working condition, the effective wind pressure is always within the set range of the wind pressure set value, the output effective wind volume is ensured to reach the required value, at the moment, the rotating speed is improved, and the smoke exhaust effect can be improved; to better operating mode cigarette machine, make effective wind pressure be located the set range of wind pressure setting value all the time, guarantee that the effective amount of wind of output reaches the required value, reduce the rotational speed this moment, when guaranteeing the smoke exhaust effect, the noise is reduced, promotes user experience. Obviously, no matter how the external pressure changes, the effective wind pressure is within the set range of the wind pressure set value and is not influenced by the change of the external pressure, and the constant wind pressure is realized. According to the actual use requirements of users, the fan characteristic curve is optimized through the constant wind pressure control logic, and the constant wind pressure is realized on the basis of guaranteeing the use requirements of users on each floor.
Drawings
To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description, although being some specific embodiments of the present invention, can be extended and extended to other structures and drawings by those skilled in the art according to 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, without making sure that these should be within the scope of the claims of the present invention.
Fig. 1 is a schematic view of a wind pressure control method of a range hood according to an embodiment of the present invention;
fig. 2 is a schematic view of a wind pressure 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 a wind pressure 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 clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, 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 a method for controlling wind pressure of a range hood according to an embodiment of the present invention is shown. The cigarette machine described in this embodiment includes a fan, and further includes a wind pressure control device for executing the wind pressure control method, and optionally, the wind pressure control device is implemented in a software and/or hardware manner, and is configured for use in a cigarette machine. For example, the wind pressure control device is integrated in a main controller of the cigarette machine, and the intelligence of the control of the cigarette machine is realized.
The wind pressure control method of the cigarette making machine provided by the embodiment comprises the following steps:
and 110, acquiring the frequency of the fan and the outlet air speed of the fan, and determining an actual air quantity value, the outlet air pressure of the fan and the pressure of a common flue according to the frequency of the fan and the outlet air speed 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 range hood 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 wind pressure control device can determine the rotating speed of the fan according to the actual frequency of the fan. The outlet air speed of the fan is the actual air speed output by an air pipe at the outlet of the fan, which is acquired by the sensor at the current moment, the outlet air speed of the fan and the air quantity of the fan have a functional relation, and the air pressure control device can calculate the actual value of the air quantity at the current moment according to the outlet air speed of the fan. Under the condition that the air speed of the air pipe is determined, the air pressure of the outlet of the fan can be determined through the fitting of the rotating speed of the fan and the air quantity of the fan, and the air pressure of the outlet of the fan at the current moment can be obtained according to the actual rotating speed and the actual value of the air quantity of the fan. The difference between the air pressure of the fan outlet and the pressure of the common flue is consumed on the branch pipe of the range hood, so that the pressure of the common flue at the current moment can be obtained according to the actual values of the air pressure and the air quantity of the fan outlet.
And 120, if the wind pressure of the outlet of the fan exceeds the set range of the wind pressure set value, calculating the target frequency of the fan under the pressure of the common flue according to the wind pressure of the outlet of the fan, the wind pressure set value and the actual value of the wind volume, and adjusting the fan.
In this step, a wind pressure set value is set in a wind pressure control device of the range hood, and the wind pressure set value is selected in combination with the actual use scene of the user. The loads of different floors are different, and detection shows that the wind pressure of a low floor is large, the wind pressure of a high floor is small, a node is set according to the height of the floor to be a wind pressure set value, and the range formed by the up-and-down floating error of the wind pressure set value is the set range of the wind pressure set value.
For example, 400Pa is used as the wind pressure setting value, wherein the wind pressure error is ± 50Pa, the setting range of the wind pressure setting value is [350, 450 ]. Based on the above example, the specific implementation procedure of this step is: after the wind pressure of the outlet of the fan is obtained, whether the wind pressure of the outlet of the fan exceeds the set range [350, 450] of a wind pressure set value is detected; if not, returning to execute the step 110; and if so, calculating the target frequency of the fan. If the wind pressure at the outlet of the fan is 375Pa, obviously, the wind pressure value is [350, 450], and the step 110 is determined to be executed again. If the outlet wind pressure of the fan is 330Pa, obviously, the wind pressure value exceeds 350, 450, and the target frequency of the fan is calculated. It can be understood that the value of the wind pressure setting value is an example, a manufacturer can adjust the wind pressure setting value according to different products and market areas used by the products, and when the same product is applied to different market areas, the parameters of the product may be different. Not limited thereto.
As described above, when the outlet wind pressure of the fan exceeds the set range of the wind pressure set value, the target frequency of the fan under the common flue pressure is calculated according to the outlet wind pressure of the fan, the wind pressure set value and the actual value of the wind volume, and the fan is adjusted. Obviously, the determined target frequency considers the influence of the external pressure on the range hood, the outlet air pressure of the fan which is adjusted according to the target frequency under the pressure of the common flue is necessarily within the set range of the air pressure set value, and therefore, no matter how the operation parameters such as the air volume and the like of a user change, the adjustment can be carried out according to the air pressure control logic, the outlet air pressure of the fan is maintained within the set range of the air pressure set value, and the constant air pressure is realized.
As mentioned above, for the cigarette 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 machine can be controlled to output enough rotating speed, effective wind pressure is not reduced, and smoking effect is improved. 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-wind pressure cigarette machine, is guaranteeing to satisfy each floor user and uses the basis on, reduces the noise of high floor user cigarette machine in the family, improves the smoking effect of low floor user cigarette machine in the family simultaneously.
In the embodiment, after the wind pressure is adjusted according to the wind pressure control program, for the range hood with poor working conditions, the effective wind pressure is always within the set range of the wind pressure set value, the output effective wind volume is ensured to reach the required value, at the moment, the rotating speed is increased, and the smoke exhaust effect can be improved; to better operating mode cigarette machine, make effective wind pressure be located the set range of wind pressure setting value all the time, guarantee that the effective amount of wind of output reaches the required value, reduce the rotational speed this moment, when guaranteeing the smoke exhaust effect, the noise is reduced, promotes user experience. Obviously, no matter how the external pressure changes, the effective wind pressure is within the set range of the wind pressure set value and is not influenced by the change of the external pressure, and the constant wind pressure is realized. According to the actual use requirements of users, the fan characteristic curve is optimized through the constant wind pressure control logic, and the constant wind pressure is realized on the basis of guaranteeing the use requirements of users on each floor.
For example, 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 outlet wind speed of the fan are obtained, and the actual value of the wind volume, the outlet wind pressure of the fan, and the common flue pressure are determined according to the frequency of the fan and the outlet wind speed of the fan, which specifically includes:
and step 111, acquiring the actual frequency f0 of the fan and the outlet wind speed v0 of the fan.
n＝μ(f) (1)；
PT＝H(Q，n) (3)；
and xi is the resistance coefficient of the branch pipe of the cigarette machine, A is the sectional area of the branch pipe of the cigarette machine, and D is the diameter of the branch pipe of the cigarette machine at the outlet of the cigarette machine.
As described above, the actual frequency f0 of the fan is collected at the current time t 0. In a mathematical model of a range hood, the rotation speed and the frequency of a fan are in a linear relation and have a functional relation shown in formula (1), and the actual rotation speed n0 of the fan at the current time is calculated to be mu (f0) according to the actual frequency f0 at the current time.
The fan outlet wind speed v0 is collected at the current time t 0. In the mathematical model of the smoke machine, under the determination of the wind speed of the wind pipe, the wind quantity and the wind speed of the fan have the functional relationship as the formula (2), and then the wind speed and the wind speed are calculated to obtain the wind speed and the wind speed
According to the P-Q characteristic performance test data of the fan, the wind pressure P of the fan can be determined by fitting the fan rotating speed n and the wind quantity Q, the functional relation of the wind pressure P meets the formula (3), the fan rotating speed n0 and the wind quantity Q0 at the current moment are known, and the wind pressure P at the outlet of the fan at the current moment can be obtained according to the formula (3)T0＝H(Q0，n0)。
The wind pressure P of the fan outlet at the current moment can be obtainedT0And an actual value of air quantity Q0. In the mathematical model of the cigarette machine, the difference between the wind pressure at the outlet of the fan and the pressure of the common flue is consumed on the branch pipe of the cigarette machine, and the equation is formula (4). Then based on the equation relationship, the wind pressure P of the outlet of the fan is knownT0And the actual value Q0 of the air volume of the fan, the common flue pressure P0 of the cigarette machine at the current time can be calculated according to the formula (4)T0-αQ02。
As shown in fig. 2, the operation of optional step 120, if the fan outlet air pressure exceeds the set range of the air pressure set value, calculating the target frequency of the fan under the common flue pressure according to the fan outlet air pressure, the air pressure set value and the actual value of the air volume, and adjusting the fan specifically includes:
as described above, in the case where the wind pressure at the outlet of the fan exceeds the setting range of the wind pressure setting value, the common flue pressure P0 of the environment where the current range hood is located is known, and the fan setting value P is knownTsetThen, the fan air volume demand value Q1 can be calculated according to the formula (4), and the calculated fan air volume demand value Q1 is characterized in that the set value P of the air pressure is reached under the external pressure P0TsetThe required air quantity of the fan.
Specifically, the known fan air volume demand value Q1 is characterized in that the set value P of the air pressure is reached under the outside pressure P0TsetThe required air quantity of the fan satisfies the formula (4) PTset-P0＝αQ12. And a common flue pressure P0 ═ PT0-αQ02Then the operation yields Q1.
Based on the method, in the follow-up wind pressure control process, under the condition that the wind pressure at the outlet of the fan exceeds the set range of the wind pressure set value, the wind pressure P at the outlet of the fan at the moment is directly collectedT0Actual value Q0 of fan air volume and pre-known set value P of wind pressureTsetAnd the required air quantity Q1 of the fan is directly obtained according to the formula (4), and the air pressure control process is simple.
As described above, at the common tunnel pressure P0 at the present time, it is known that the wind pressure set value P is reachedTsetThe required fan required air quantity is Q1, soP can be obtained from the formula (3)TsetH (Q1, n1), where n1 is characterized as the wind pressure set point P is reached at the common flue pressure P0 at the current timeTsetAnd when the required air quantity of the fan is Q1, the required rotating speed of the fan is n1 ═ H-1 Q1(PTset)。
The rotating speed of the fan and the frequency of the fan meet the formula (1), and the wind pressure set value P is reached under the known common flue pressure P0 at the current momentTsetIf the required fan speed is n1 when the required fan air volume is Q1, then n1 ═ μ (f1) and f1 ═ μ (f1) can be obtained-1(n1), wherein f1 is characterized in that the wind pressure set value P is reached under the common flue pressure P0 at the current momentTsetAnd the required frequency of the fan, namely the target frequency, is required when the required air quantity of the fan is Q1.
Adjusting the frequency of the fan according to f1 to make the frequency of the fan equal to the target frequency f1, so that the actual wind pressure output by the range hood can be at a wind pressure set value P after the fan operates according to the adjusted target frequencyTsetThe set range of the range realizes constant wind pressure, and the actual effective wind pressure of the range hood can not change along with the change of the external load.
As shown in fig. 2, the optional wind pressure control method further includes: further comprising: if the wind pressure at the outlet of the fan is within the set range of the wind pressure set value, or the fan is adjusted according to the target frequency of the fan, and the wind pressure control process is restarted after the set time length. If the wind pressure at the outlet of the fan is within the set range of the wind pressure set value at the current moment, the actual effective wind pressure output by the cigarette making machine is close to the ideal wind pressure, the smoking effect meets the requirement of a user, 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 wind pressure of the whole range hood is realized, so that the range hood is always in the set range of the wind pressure set value in the operation process, and the user experience is improved. The set time length delta t can be relatively large (about 2 minutes, for example), timing adjustment of the wind pressure of the range hood is achieved, the range hood is adjusted in timing after certain gathering 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 pressure and the air volume that lampblack absorber on the existing market set for are all according to the ideal environment of laboratory, do not consider the influence of in-service use ambient pressure to air pressure and 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, public flue pressure is big more, and the actual effective air volume is low more, can appear the oil smoke escape, not smoke the phenomenon, can appear other users' oil smoke backward flow even, reduce 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 the wind pressure control procedure, and the effective wind pressure that can satisfy user's demand under the different work condition is invariable, and the user is in the use, and the effective wind pressure of reality can not change along with external load's change.
The following ordinate is the actual load of the user, namely the pressure of the common flue, the abscissa is the actual output air volume of the cigarette machine, the rising curve is the impedance curve of the cigarette machine, the falling curve is the pressure-air volume curve, and the straight line segment is the air pressure line segment.
Referring to figure 3, a graph of the performance of a prior art cigarette making machine is shown. According to the formula (4), under the condition that the air pressure at the outlet of the fan of the range hood is determined, the larger the pressure of the common flue is, the smaller the actual output air volume of the range hood is; under the condition that the outlet air pressure of the smoke machine is determined, the smaller the pressure of the common flue is, the larger the actual output air quantity of the smoke machine is. The smoke machine with poor working condition has large pressure of the common flue, so that the actual output air volume under an ideal air pressure gear is smaller than the air volume value meeting the user requirement, and the smoke machine has poor smoking effect and does not smoke. For a smoke machine with a good working condition, the pressure of a common flue of the smoke machine is small, the actual output air volume under an ideal air pressure gear is larger than the air volume value meeting the requirements of users, the smoking effect is not problematic, but the air volume is too large, so that the noise is large.
Referring to fig. 4, the performance curve of the optimized constant effective wind pressure cigarette maker is shown. As long as the cigarette machine wind pressure surpasss the wind pressure setting value and just carries out frequency control to the cigarette machine for the effective wind pressure of cigarette machine reality is invariable, and this effective wind pressure of reality can not change along with external load's change, and the effective wind pressure that satisfies the user demand is invariable, realizes permanent wind pressure. The wind pressure control program can maintain the wind pressure of a user's cigarette machine within the set range of 450Pa, namely [400, 500], the required wind volume and the target frequency are obtained by calculation in the wind pressure interval, after the regulation is carried out according to the target frequency, the wind pressure of the cigarette machine is within the set range of the wind pressure set value, the wind volume reaches the required wind volume, the wind pressure is not influenced by the factors such as the wind volume, the external pressure and the like, and the stable output of the wind pressure is realized.
According to the embodiment of the invention, the constant wind pressure is realized through the constant wind pressure control logic, and it can be understood 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.
An embodiment of the present invention further provides a wind pressure control device for a cigarette making machine, where the cigarette making machine includes a fan, and as shown in fig. 5, the wind pressure control device includes: an operation parameter obtaining module 10, configured to obtain a frequency of the fan and an outlet air speed of the fan, and determine an actual value of an air volume, an outlet air pressure of the fan, and a common flue pressure according to the frequency of the fan and the outlet air speed of the fan; and the smoke machine parameter adjusting module 20 is configured to calculate a target frequency of the fan under the pressure of the common flue and adjust the fan according to the outlet wind pressure of the fan, the wind pressure set value and the actual wind volume value if the outlet wind pressure of the fan exceeds the set range of the wind pressure set value.
The optional operation parameter obtaining module 10 includes:
the operation parameter acquisition submodule is used for acquiring the actual frequency f0 of the fan and the outlet wind speed v0 of the fan;
the operation parameter operation submodule is used for calculating the actual rotating speed n0 of the fan according to the formula (1) according to the actual frequency f0 of the fan, calculating the actual air volume value Q0 according to the formula (2) and the outlet air speed v0 of the fan, and calculating the outlet air pressure P of the fan according to the formula (3) and the actual rotating speed n0 and the actual air volume value Q0 of the fanT0According to the wind pressure P of the fan outletT0And the actual air volume value Q0, calculating the common flue pressure P0 according to the formula (4),
n＝μ(f) (1)；
PT＝H(Q，n) (3)；
and xi is the resistance coefficient of the branch pipe of the cigarette machine, A is the sectional area of the branch pipe of the cigarette machine, and D is the diameter of the branch pipe of the cigarette machine at the outlet of the cigarette machine.
The optional cigarette machine parameter adjustment module 20 includes:
a demand parameter operation submodule for calculating the wind pressure P at the outlet of the fanT0The wind pressure set value PTsetAnd the actual air quantity value Q0 is calculated to reach the set air pressure value P under the pressure of the common flueTsetThe required air volume demand value Q1,
and determining that the set value P of the wind pressure is reached according to the required value Q1 of the wind volumeTsetThe required rotating speed n1, n1 ═ H of the fan-1 Q1(PTset) According to the requirements of the fanThe target frequency f1 of the fan is obtained by the rotating speed n1, and 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 method further comprises: a timing control module 30, configured to, if the outlet wind pressure of the fan is within the set range of the wind pressure set value, or complete the adjustment of the fan according to the target frequency of the fan, and restart the wind pressure control process after a set time length
Accordingly, the control logic of the frequency conversion scheme of the wind pressure 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: the wind speed v0 at the outlet of the fan at the moment is collected, and the wind volume of the fan at the moment can be obtained by the formula (2)
The wind pressure P of the outlet of the fan can be obtained by the formula (3)T0(ii) a Wind pressure P of the outlet of the fanT0With the pre-stored wind pressure set value PTsetAnd (3) comparison:
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 (4) to be PT0-αQ02Therefore, the external pressure P0 can be obtained, and the wind pressure set value P is reachedTsetRequired air volume of
Step 4: determining the required rotating speed of the fan under the external pressure as n1 ═ H-1 Q1(PTset) 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, the wind pressure that all can realize the fan is adjusted for the effective wind pressure of reality is not influenced by external load, satisfies the invariable effective wind pressure of user's demand under the different work condition, realizes permanent wind pressure, 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 some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.
Claims (4)
1. A wind pressure control method of a cigarette making machine is characterized in that the cigarette making machine comprises a fan, and the wind pressure control method comprises the following steps:
acquiring the frequency of the fan and the outlet air speed of the fan, and determining an actual air quantity value, the outlet air pressure of the fan and the pressure of a common flue according to the frequency of the fan and the outlet air speed of the fan;
if the wind pressure of the fan outlet exceeds the set range of a wind pressure set value, calculating the target frequency of the fan under the pressure of the common flue according to the wind pressure of the fan outlet, the wind pressure set value and the actual value of the wind volume, and adjusting the fan;
wherein, the frequency of obtaining the fan with the export wind speed of fan, confirm amount of wind actual value, fan export wind pressure and public flue pressure according to this fan frequency and fan export wind speed, include:
acquiring the actual frequency f0 of the fan and the outlet wind speed v0 of the fan;
calculating the actual rotating speed n0 of the fan according to the formula (1) according to the actual frequency f0 of the fan,
calculating the actual value Q0 of the air volume according to a formula (2) and the outlet air speed v0 of the fan,
calculating the wind pressure P of the outlet of the fan according to the formula (3) according to the actual rotating speed n0 of the fan and the actual value Q0 of the wind volumeT0，
According to the wind pressure P of the fan outletT0And the actual air volume value Q0, calculating the common flue pressure P0 according to the formula (4),
n＝μ(f) (1)；
PT＝H(Q，n) (3)；
wherein xi is the resistance coefficient of the branch pipe of the cigarette machine, A is the sectional area of the branch pipe of the cigarette machine, and D is the diameter of the branch pipe of the cigarette machine at the outlet of the cigarette machine;
if the wind pressure of the fan outlet exceeds the set range of the wind pressure set value, calculating the target frequency of the fan under the pressure of the common flue according to the wind pressure of the fan outlet, the wind pressure set value and the actual value of the wind volume, and adjusting the fan, wherein the method comprises the following steps:
according to the wind pressure P of the fan outletT0The wind pressure set value PTsetAnd the actual air quantity value Q0 is calculated to reach the set air pressure value P under the pressure of the common flueTsetThe required air volume demand value Q1,
according to the air quantity demand value Q1, the wind pressure set value P is determined to be reachedTsetThe required rotating speed n1, n1 ═ H of the fan-1 Q1(PTset) 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 wind pressure control method according to claim 1, further comprising: and if the wind pressure of the outlet of the fan is within the set range of the wind pressure set value, or the fan is adjusted according to the target frequency of the fan, and the wind pressure control process is restarted after the set time length.
3. The utility model provides a wind pressure controlling means of cigarette machine which characterized in that, the cigarette machine includes the fan, and this wind pressure controlling means includes:
the operation parameter acquisition module is used for acquiring the frequency of the fan and the outlet air speed of the fan, and determining an actual air quantity value, the outlet air pressure of the fan and the pressure of a common flue according to the frequency of the fan and the outlet air speed of the fan;
the smoke machine parameter adjusting module is used for calculating the target frequency of the fan under the pressure of the common flue and adjusting the fan according to the wind pressure of the fan outlet, the wind pressure set value and the wind volume actual value if the wind pressure of the fan outlet exceeds the set range of the wind pressure set value;
wherein, the operation parameter acquisition module comprises:
the operation parameter acquisition submodule is used for acquiring the actual frequency f0 of the fan and the outlet wind speed v0 of the fan;
the operation parameter operation submodule is used for calculating the actual rotating speed n0 of the fan according to the formula (1) according to the actual frequency f0 of the fan, calculating the actual air volume value Q0 according to the formula (2) and the outlet air speed v0 of the fan, and calculating the outlet air pressure P of the fan according to the formula (3) and the actual rotating speed n0 and the actual air volume value Q0 of the fanT0According to the wind pressure P of the fan outletT0And the actual air volume value Q0, calculating the common flue pressure P0 according to the formula (4),
n＝μ(f) (1)；
PT＝H(Q，n) (3)；
wherein xi is the resistance coefficient of the branch pipe of the cigarette machine, A is the sectional area of the branch pipe of the cigarette machine, and D is the diameter of the branch pipe of the cigarette machine at the outlet of the cigarette machine;
the cigarette machine parameter adjustment module comprises:
a demand parameter operation submodule for calculating the wind pressure P at the outlet of the fanT0The wind pressure set value PTsetAnd the actual air quantity value Q0 is calculated to reach the set air pressure value P under the pressure of the common flueTsetThe required air volume demand value Q1,
and determining that the set value P of the wind pressure is reached according to the required value Q1 of the wind volumeTsetThe required rotating speed n1, n1 ═ H of the fan-1 Q1(PTset) 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 wind pressure control apparatus according to claim 3, further comprising: and the timing control module is used for finishing the adjustment of the fan according to the target frequency of the fan if the wind pressure of the fan outlet is within the set range of the wind pressure set value, and restarting a wind pressure control process after the set time length.
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| 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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