CN114440385B - Air purifier rotating speed control method - Google Patents
Air purifier rotating speed control method Download PDFInfo
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- CN114440385B CN114440385B CN202111648370.2A CN202111648370A CN114440385B CN 114440385 B CN114440385 B CN 114440385B CN 202111648370 A CN202111648370 A CN 202111648370A CN 114440385 B CN114440385 B CN 114440385B
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000002245 particle Substances 0.000 claims abstract description 193
- 238000000746 purification Methods 0.000 claims description 52
- 238000012886 linear function Methods 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000010926 purge Methods 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 230000009467 reduction Effects 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 6
- 239000013618 particulate matter Substances 0.000 description 6
- 230000003749 cleanliness Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 241000700605 Viruses Species 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000004088 simulation Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
- F24F8/80—Self-contained air purifiers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/50—Air quality properties
- F24F2110/65—Concentration of specific substances or contaminants
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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 rotating speed control method of an air purifier, which comprises the steps of determining the concentration of initial particles in a room to be C before starting the air purifier A The method comprises the steps of carrying out a first treatment on the surface of the Determining the maximum purifying particle concentration C of T minutes of each gear i The method comprises the steps of carrying out a first treatment on the surface of the According to the initial particle concentration C in the room A Controlling the gear of the rotating speed of a fan of the air purifier; if C A >C N The air purifier is operated at the nth gear for T minutes; if C A <C 1 The air purifier is operated at the 1 st gear for T minutes; if C i >C A >C i‑1 Then according to the initial particle concentration C A With the i-th gear operation time t i The functional relation between the air purifier and the first operating t in the ith gear i Minute, when the running time of the ith gear reaches t i After that, the fan rotating speed of the air purifier is switched to the (i-1) -th gear operation T-T i And (3) minutes. The invention controls the gear and the running time of the air purifier based on the initial particle concentration, thereby ensuring that the rapid reduction of the concentration of surrounding particles has no influence on the air purifier and having better purifying effect.
Description
Technical Field
The invention relates to the technical field of control of the rotating speed of a fan of an air purifier, in particular to a rotating speed control method of the air purifier.
Background
The fan of the air purifier has high, medium and low multi-gear, the conventional fan rotating speed control method is controlled by a threshold value, namely, a particle concentration range is set for each gear, and if the real-time particle concentration is in the particle concentration range of a certain gear, the fan rotating speed of the air purifier is controlled to operate in the gear according to the real-time particle concentration obtained by real-time measurement of a sensor for measuring the particle concentration arranged in the air purifier.
However, this fan speed control method has the following disadvantages: after the air purifier is operated, the concentration of surrounding particles is reduced rapidly, so that the air purifier is quickly lowered to a low-grade operation, and the effect is not exerted.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a rotating speed control method of an air purifier, which controls the gear and the running time of the air purifier based on the initial particle concentration, thereby ensuring that the rapid reduction of the concentration of surrounding particles has no influence on the air purifier and has better purifying effect.
In order to achieve the above purpose, the present invention adopts the following technical scheme, including:
the method for controlling the rotating speed of the air purifier aims at purifying the air, and comprises the following steps: taking initial particles in a room before starting up as purification objects, and reducing the particle number of space particles to a set number D after the air purifier is started up and operated for T minutes;
the fan rotational speed gear of air purifier includes the N shelves, and from 1 st shelves to N shelves, and fan rotational speed increases gradually, through the gear control fan rotational speed of adjusting fan rotational speed, specifically includes following steps:
s1, before the air purifier is started, determining the initial particle concentration in a room as C A The unit is ug/m 3 ；
S2, respectively determining the upper limit value of the concentration of the cleanable particles in the T minutes of each gear, namely the maximum concentration of the cleanable particles in the T minutes of each gear; wherein, the maximum purification particle concentration of the ith grade T minute is C i The unit is ug/m 3 ，i＝1,2,…N；
S3, according to the initial particle concentration C in the room A A gear for controlling the rotating speed of a fan of the air purifier,
if C A >C N The fan speed of the air purifier is always operated in the N-th gear, namely the operation time of the N-th gear is T minutes; wherein C is N Maximum purge particle concentration for T minutes at N-th;
if C A <C 1 The fan speed of the air purifier is always operated in the 1 st gear, namely the operation time of the 1 st gear is T minutes; wherein C is 1 Maximum purge particle concentration for T minutes at grade 1;
if C i >C A >C i-1 The fan speed of the air purifier is operated at the ith gear firstly and according to the initial particle concentration C A With the i-th gear operation time t i The functional relation between the control of the running time t of the ith gear i The unit is min, and when the running time of the ith gear reaches t i After that, the fan speed of the air purifier is switched to the i-1 th gear operation, and the operation time t of the i-1 th gear i-1 ＝T-t i The method comprises the steps of carrying out a first treatment on the surface of the Wherein C is i 、C i-1 The T minute maximum purification particle concentrations of the i th grade and the i-1 th grade are respectively.
Further, in step S2, the T minute maximum purification particle concentration C of the ith stage i The calculation mode of (2) is as follows:
C i ＝f(A i -B i (T))； (2)
wherein B is i (T) represents the number of particles remaining in the room after T minutes of operation in the ith gear in units of one/m 3 ；A i Represents the maximum initial particle number of the ith grade in units of one/m 3 ；p i The purification efficiency corresponding to the ith gear is expressed in units of; e, e i The circulation time required by the air purifier for circulating the room once under the ith grade is expressed as h; q i The purification unevenness corresponding to the ith grade is expressed in units of; w represents the leakage amount of the room, and the unit is that of the room is that of one/min.m 3 ；
Firstly, taking the formula (1)B i (T) =D, and the maximum initial particle number A of the ith grade is calculated i The method comprises the steps of carrying out a first treatment on the surface of the Reusing the calculated maximum initial particle number A of the ith gear i Substituting the obtained product into a formula (2), and calculating to obtain the maximum purification particle concentration C of the ith grade T minutes i ；
Wherein A is i -B i (T) represents the T minute maximum purification particle count of the ith stage in units of one/m 3 The method comprises the steps of carrying out a first treatment on the surface of the f (·) represents a linear function between the number of particles and the concentration of particles.
Further, in step S3, the initial particle concentration C A With the i-th gear operation time t i The construction mode of the functional relation is as follows:
if the initial particle number in the room before the air purifier is started is A, the unit is one/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Then:
the running time of the rotating speed of the fan in the ith gear reaches t i The residual particle number in the room is then B i (t i ) In units of individual/m 3 ；
The rotating speed of the fan of the air purifier is switched to the i-1 th gear operation, and the operation time of the i-1 th gear reaches t i-1 After that, i.e. after the air purifier is operated for T minutes, the residual particle number in the room is B i-1 (t i-1 ) In units of individual/m 3 ；
Wherein p is i 、p i-1 The purification efficiency corresponding to the ith gear and the (i-1) th gear is respectively expressed in units of; e, e i 、e i-1 Respectively representing the circulation time required by the air purifier for circulating the room once under the i-th gear and the i-1 th gear, wherein the unit is h; q i 、q i-1 The purification non-uniformity corresponding to the i-th gear and the i-1 th gear is shown in units; w represents the amount of room leakage, the unit is individual/min·m 3 ；
By exhaustive list to obtain t i All possible values of (1) t i <30, and t i Taking B as an integer i-1 (t i-1 ) =d, respectively to t i Each possible value of (2) is calculated, and the initial particle number A is calculated reversely by the formulas (3) and (4) to obtain t i The initial particle number A, i.e. t, corresponding to each possible value of (a) i A; then according to the linear function f (·) between the particle number and the particle concentration, calculating the initial particle concentration C corresponding to the initial particle number A A =f (a), yielding t i Initial particle concentration C corresponding to each possible value A I.e. t i →A→C A Fitting to obtain initial particle concentration C A With the i-th gear operation time t i A functional relationship between them.
Further, the initial particle concentration C obtained by fitting A With the i-th gear operation time t i The expression of the functional relation is as follows:
wherein x is i 、y i 、z i Are polynomial coefficients; alpha i ＝2。
Further, a cycle time e required for the air cleaner to cycle the room once in the ith gear i ＝V/f i The unit is h; wherein V is the room volume in m 3 ；f i The unit is m for the air quantity corresponding to the ith gear 3 /h。
Further, the initial particle number A in the room before the air purifier is started is measured by a particle counter or calculated by a linear function between the particle number and the particle concentration.
Further, the air purifier is started and operated for T minutes, and after the particle number of the space particles is reduced to the set number D, the fan rotating speed of the air purifier is switched to a threshold value control method.
The invention has the advantages that:
(1) The invention controls the gear and the running time of the air purifier based on the initial particle concentration, thereby ensuring that the rapid reduction of the concentration of surrounding particles has no influence on the air purifier and having better purifying effect.
(2) According to the calculation model, the purification non-uniformity corresponding to each gear of the air purifier and the room leakage are considered, so that the calculation model is more reasonable, the calculation result is more accurate, the rotating speed of the air purifier is controlled based on the calculation result, and the purification effect of the air purifier is further ensured.
Drawings
Fig. 1 is a flowchart of a method for controlling the rotational speed of an air purifier according to the present invention.
Fig. 2 is a graph showing the fit of the 4 th run time of the air purifier of the present embodiment to the initial particle concentration.
Fig. 3 is a graph showing the fit of the 3 rd run time of the air purifier of the present embodiment to the initial particle concentration.
Fig. 4 is a fitted curve of the 2 nd run time and the initial particle concentration of the air purifier of the present embodiment.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The fan rotational speed gear of air purifier includes N shelves, and from 1 st shelves to N shelves, and the fan rotational speed is crescent. Wherein, the fan rotational speed of air purifier in fixed gear is fixed and known, and the wind speed is fixed and known, and the fan rotational speed under different gears is only fan impeller size structure related. The air volume can be obtained by the product of the air speed and the air port area. The purification efficiency is also fixed and known in theory and is only relevant for the processing process.
In the invention, in order to determine the two fixed parameters, namely the wind speed and the purification efficiency under each gear, the air purifier can be actually tested, and the wind speed under each gear can be obtained by measuring the central position of the outlet of the air purifier by adopting an anemometer; the purification efficiency under each gear can be obtained by measuring the air inlet and the air outlet of the air purifier respectively through a particle counter, wherein the purification efficiency is = (inlet particle number-outlet particle number)/the particle number of the particles at the inlet. According to the related specification of the air purifier, the particles are particles with the diameter of more than or equal to 0.5um and PM of more than 0.5 um.
The actual test of the air purifier can be as follows: the wind speed of the fan corresponding to the ith gear is v i The unit is m/s; the air quantity corresponding to the ith gear is f i In m 3 /h; the purification efficiency corresponding to the ith gear is p i ；i＝1,2…N。
In order to obtain the corresponding purification efficiency under each gear, wind speed test can be performed, namely, wind speed measurement is performed at the central position of the outlet of the air purifier by adopting an anemometer.
According to the actual measurement parameters, the method comprises the following steps: in the i th gear, the time required for the air purifier to circulate all the air in the room once is e i ，e i ＝V/f i The unit is h; wherein V is the room volume in m 3 。
Defining the purification unevenness q corresponding to the i-th stage of the air purifier i The unit is; and defining the leakage of the room as w, the unit is individual/min.m 3 ；
The purification non-uniformity refers to that under different gears, due to different wind speeds, the air purifier generates different influences on disturbance of the whole room air, in the embodiment, the non-uniformity index is estimated by combining room flow field simulation and actual test data, the higher the gear is, the higher the fan rotating speed is, the larger the fan air quantity is, the larger the disturbance influence of the air purifier on the whole room air is, and the non-uniformity of the particle distribution is smaller; conversely, the lower the gear is, the lower the fan rotating speed is, the smaller the fan air quantity is, the smaller the disturbance influence of the air purifier on the whole room air is, and the larger the non-uniformity of the particle distribution is.
Room leakage refers to the number of particles leaked in a room per minute. The value of the room leakage is referred to the related description in the GB50073-2013 clean factory building design specification.
According to the specification in ISO14644-1 (international standard) and the design requirement of a clean room, such as a sterile room of a hospital, in order to control the cleanliness below an index, the purification target of an air purifier of the sterile room is to take initial particles in the room before starting up as purification targets, and the requirement of purifying the particles with the diameter of more than 0.5um to the 10-ten thousand-level cleanliness class is that the particle number with the diameter of more than 0.5um in each cubic meter of space is lower than 3520000, that is, the maximum concentration limit of the particles with the diameter of more than 0.5um is 3520000, that is, T=30, D= 3520000, in 30 minutes of starting up the air purifier.
After the purification target is reached, the particle number in the air is very low, viruses and bacteria cannot be carried, and the virus transmission can be effectively controlled.
In order to meet the above purification objectives, the method for controlling the rotational speed of the air purifier according to the present invention is as follows:
s1, determining the initial particle concentration in a room before starting up as C A The unit is ug/m 3 ；
S2, respectively determining the upper limit value of the concentration of the cleanable particles in 30 minutes in each gear, namely the maximum concentration of the cleanable particles in 30 minutes in each gear.
Wherein, the maximum purification particle concentration C of 30 minutes in the ith grade i The calculation mode of (2) is as follows:
C i ＝f(A i -B i (30))； (2)
wherein B is i (30) Indicating the number of particles remaining in the room after 30 minutes of operation in the ith gear in units of one/m 3 The method comprises the steps of carrying out a first treatment on the surface of the In the present invention, the particle count is simply the particulate matter per unit volumeNumber of pieces; a is that i Represents the maximum initial particle number of the ith grade in units of one/m 3 ；p i The purification efficiency corresponding to the ith gear is expressed in units of; e, e i The circulation time required by the air purifier for circulating the room once under the ith grade is expressed as h; q i The purification unevenness corresponding to the ith grade is expressed in units of; w represents the leakage amount of the room, and the unit is that of the room is that of one/min.m 3 ；
Firstly, using the formula (1), taking B i (30) = 3520000, calculating the maximum initial particle number a of the i-th gear i The method comprises the steps of carrying out a first treatment on the surface of the Reusing the calculated maximum initial particle number A of the ith gear i Substituting the obtained product into a formula (2), and calculating to obtain the maximum purification particle concentration C of the ith grade T minutes i The unit is ug/m 3 ；
Wherein A is i -B i (30) Represents the 30 min maximum purification particle number of the i-th grade, and the unit is one/m 3 The method comprises the steps of carrying out a first treatment on the surface of the f (·) represents a linear function between the number of particles and the concentration of particles.
S3, according to the initial particle concentration C in the room A The gear of the fan rotating speed of the air purifier is controlled by the following three conditions:
first, if C A >C N When the fan rotating speed of the air purifier is always the maximum gear, namely the N-th gear, the purification target of the air purifier cannot be met, the fan rotating speed of the air purifier is always operated in the N-th gear, namely the maximum gear, and after the air purifier is operated for 30 minutes, the air purifier is switched to threshold value control. Wherein C is N The maximum purge particle concentration was 30 minutes for the nth gear.
Second, if C A <C 1 When the fan rotating speed of the air purifier is always the minimum gear, namely the 1 st gear, the purification target of the air purifier can be met, the fan rotating speed of the air purifier is always operated in the 1 st gear, namely the minimum gear, and after the air purifier is operated for 30 minutes, the air purifier is switched to threshold value control. Wherein C is 1 The maximum purification particle concentration was 30 minutes for stage 1.
Third, if C i >C A >C i-1 The fan speed of the air purifier is controlled to operate at the ith gear and is controlled according to the initial particle concentration C A With the i-th gear operation time t i The functional relation between the control of the running time t of the ith gear i The unit is min, and when the running time of the ith gear reaches t i After that, the fan speed of the air purifier is switched to the i-1 th gear operation, and after the air purifier is operated for 30 minutes, the operation time t of the i-1 th gear is the time i-1 ＝30-t i The air purifier is switched to the threshold value control. Wherein C is i 、C i-1 The maximum purification particle concentration was 30 minutes in the i-th and i-1 th stages, respectively.
In the present invention, the initial particle concentration C is established A With the i-th gear operation time t i The functional relation between the two is as follows:
if the initial particle number in the room before the air purifier is started is A, the unit is one/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Then:
the running time of the rotating speed of the fan in the ith gear reaches t i The residual particle number in the room is then B i (t i ) =, in units of one/m 3 ；
The rotating speed of the fan of the air purifier is switched to the i-1 th gear operation, and the operation time of the i-1 th gear reaches t i-1 After that, i.e. after the air purifier is operated for 30 minutes, the residual particle number in the room is B i-1 (t i-1 ) In units of individual/m 3 ；
And the remaining particle count B in the room after 30 minutes of operation of the air cleaner i-1 (t i-1 ) Meeting the purification objective, i.e. B i-1 (t i-1 )≤3520000。
Thus, take B i-1 (t i-1 ) = 3520000, using the exhaustive list to obtain t i All possible values of (1) t i <30, and t i Is an integer, t i-1 ＝30-t i Respectively to t i Each possible value of (2) is calculated, and the above formulas (3) and (4) are reversely calculated to obtain an initial particle number A, and t is obtained i The initial particle number A, i.e. t, corresponding to each possible value of (a) i Obtaining initial particle concentration C corresponding to the initial particle number A according to the linear function between the particle number and the particle concentration A =f (a), thereby yielding t i Initial particle concentration C corresponding to each possible value A I.e. t i →A→C A Fitting to obtain initial particle concentration C A With the i-th gear operation time t i The expression of the functional relation is as follows:
wherein x is i 、y i 、z i Are polynomial coefficients; alpha i ＝2。
In the invention, the threshold value control of the air purifier is a control mode in the prior art, namely, the particle concentration range is set for each gear according to the real-time particle concentration obtained by real-time measurement of a sensor for measuring the particle concentration arranged in the air purifier, and if the real-time particle concentration is in the particle concentration range of a certain gear, the fan rotating speed of the air purifier is controlled to operate in the gear.
Example 1,
In this embodiment, the room volume V is 105m 3 The method comprises the steps of carrying out a first treatment on the surface of the Wherein the room area is 35m 2 The height is 3m; the fan rotating speed gear of the air purifier comprises 4 gears, and the fan wind speed v corresponding to each gear i Air volume f i Purification efficiency p i And the cycle time e required for the air cleaner to circulate all the air in the room once in each gear i As shown in table 1 below, i=1, 2 … 4.
TABLE 1
In this embodiment, the air purifier is purifying unevenness q in the i-th stage i And the room leakage amount w, as shown in table 2 below:
TABLE 2
The purification goal of the air purifier is to take the initial particulate matters in the room before starting up as purification objects, purify the particle number with the diameter larger than 0.5um to the requirement of 10 ten thousand-level cleanliness class within 30 minutes of starting up the air purifier, namely the particle number with the diameter larger than 0.5um in each cubic meter of space is lower than 3520000,
in order to meet the above-mentioned purification objectives, the rotational speed control process of the air purifier in this embodiment is specifically as follows:
s11, measuring initial particle concentration C in the room before starting up by using particle concentration sensor such as gas analyzer A . In this embodiment, a particle counter is also used to measure the initial particle count a in the room before start-up.
Particle counts can be measured directly using particle counters, which are expensive. In order to reduce errors, the particle counter is directly adopted to measure the particle number. The particle concentration can be directly used for controlling in actual use, namely, the particle concentration is obtained by measurement, and the particle number is calculated according to the linear relation between the particle number and the particle concentration;
s12, respectively calculating the residual particle number of the room after each gear is operated for 30 minutes by using the formula (1), so as to obtain the maximum purification particle number of each gear for 30 minutes; and (3) respectively calculating by using the formula (2) to obtain the maximum purification particle concentration of each gear for 30 minutes.
Wherein, the maximum purification particle count of 30 minutes for each gear, and the maximum purification particle concentration of 30 minutes for each gear are shown in the following table 3:
TABLE 3 Table 3
S13, according to the initial particle concentration C in the room A The gear of the fan rotating speed of the air purifier is controlled, and the gear is specifically shown as follows:
if the initial particulate matter concentration 534 in the room<C A Controlling the rotating speed of the fan of the air purifier to be always operated at the 4 th gear until the air purifier is switched to threshold value control after 30 minutes;
if the initial particulate matter concentration 113 in the room<C A Not more than 534, according to the initial particle concentration C A With 4 th gear run time t 4 The functional relation between the two components controls the running time t of the fan rotating speed of the air purifier at the 4 th gear 4 When the running time of 4 th gear reaches t 4 After that, the residual time is operated at 3 gears until the air purifier is switched to threshold value control after 30 minutes;
if the initial particulate matter concentration in the room is 20<C A Not more than 113, according to the initial particle concentration C A With 3 rd gear run time t 3 The functional relation between the two components controls the running time t of the fan rotating speed of the air purifier at the 3 rd gear 3 When the running time of the 3 rd gear reaches t 3 Then, the residual time is operated in 2 gears until the air purifier is switched to threshold value control after 30 minutes;
if the initial particulate matter concentration in the room is 7<C A Less than or equal to 20, according to the initial particle concentration C A With run time t of gear 2 2 The functional relation between the two components controls the running time t of the fan rotating speed of the air purifier at the 2 nd gear 2 When the running time of the 2 nd gear reaches t 2 After that, the residual time is operated at 1 gear until the air purifier is switched to the threshold value control after 30 minutes；
If the initial particulate matter concentration C in the room A And if the speed of the fan of the air purifier is less than or equal to 7, controlling the fan speed of the air purifier to always operate in the 1 st gear until the air purifier is switched to threshold value control after 30 minutes.
In the present invention, the initial particle concentration C is established A With the i-th gear operation time t i The functional relation between the two is as follows:
the initial particle number in the room before the air purifier is started is A, and the running time of the fan rotating speed in the ith gear reaches t i The residual particle number in the room is then B i (t i ) In units of individual/m 3 ；
The rotating speed of the fan of the air purifier is switched to the i-1 th gear operation, and the operation time of the i-1 th gear reaches t i-1 After that, i.e. after the air purifier is operated for 30 minutes, the residual particle number in the room is B i-1 (t i-1 ) In units of individual/m 3 ；
And the remaining particle count B in the room after 30 minutes of operation of the air cleaner i-1 (t i-1 ) Meeting the purification objective, i.e. B i-1 (t i-1 )≤3520000。
Thus, take B i-1 (t i-1 ) = 3520000, using the exhaustive list to obtain t i All possible values of (1) t i <30, and t i Is an integer, t i-1 ＝30-t i Respectively to t i Each possible value of (2) is calculated, and the above formulas (3) and (4) are reversely calculated to obtain an initial particle number A, and t is obtained i The initial particle number A, i.e. t, corresponding to each possible value of (a) i Obtaining initial particles according to the linear function between the particle number and the particle concentrationInitial particle concentration C corresponding to number A A =f (a), thereby yielding t i Initial particle concentration C corresponding to each possible value A I.e. t i →A→C A . In the present embodiment, the operation time and the initial particle number A and the initial particle concentration C of each gear A The set of correspondence points between are shown in table 4 below:
TABLE 4 Table 4
Fitting according to the corresponding point set of Table 4 to obtain initial particle concentration C A With the operating time t of each gear i A functional relationship between them. In the present embodiment of the present invention,
initial particle concentration C A With 4 th gear run time t 4 As shown in fig. 2, the functional relationship is as follows:
t 4 ＝-0.000079C A 2.000000 +0.113146C A -10.068323；
initial particle concentration C A With 3 rd gear run time t 3 As shown in fig. 3, the functional relationship is as follows:
t 3 ＝-0.002045C A 2.000000 +0.572576C A -9.287879；
initial particle concentration C A With run time t of gear 2 2 As shown in fig. 4, the functional relationship is as follows:
t 2 ＝-0.057005C A 2.000000 +3.493269C A -18.189560；
in the invention, the threshold value control of the air purifier is a control mode in the prior art, namely, the particle concentration range is set for each gear according to the real-time particle concentration obtained by real-time measurement of a sensor for measuring the particle concentration arranged in the air purifier, and if the real-time particle concentration is in the particle concentration range of a certain gear, the fan rotating speed of the air purifier is controlled to operate in the gear.
The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (3)
1. The method for controlling the rotating speed of the air purifier is characterized in that the purifying target of the air purifier comprises the following steps: taking initial particles in a room before starting up as purification objects, and reducing the particle number of space particles to a set number D after the air purifier is started up and operated for T minutes;
the fan rotational speed gear of air purifier includes the N shelves, and from 1 st shelves to N shelves, and fan rotational speed increases gradually, through the gear control fan rotational speed of adjusting fan rotational speed, specifically includes following steps:
s1, before the air purifier is started, determining the initial particle concentration in a room as C A The unit is ug/m 3 ；
S2, respectively determining the upper limit value of the concentration of the cleanable particles in the T minutes of each gear, namely the maximum concentration of the cleanable particles in the T minutes of each gear; wherein, the maximum purification particle concentration of the ith grade T minute is C i The unit is ug/m 3 ，i＝1,2,...,N；
S3, according to the initial particle concentration C in the room A A gear for controlling the rotating speed of a fan of the air purifier,
if C A >C N The fan speed of the air purifier is always operated in the N-th gear, namely the operation time of the N-th gear is T minutes; wherein C is N Maximum purge particle concentration for T minutes at N-th;
if C A <C 1 The fan speed of the air purifier is always operated in the 1 st gear, namely the operation time of the 1 st gear is T minutes; wherein C is 1 Maximum purge particle concentration for T minutes at grade 1;
if C i >C A >C i-1 The fan speed of the air purifier is operated at the ith gear firstly and according to the initial particle concentration C A With the i-th gear operation time t i The functional relation between the control of the running time t of the ith gear i The unit is min, and when the running time of the ith gear reaches t i After that, the fan speed of the air purifier is switched to the i-1 th gear operation, and the operation time t of the i-1 th gear i-1 ＝T-t i The method comprises the steps of carrying out a first treatment on the surface of the Wherein C is i 、C i-1 Maximum purifying particle concentration in T minutes of the ith grade and the (i-1) th grade respectively;
in step S2, the T minute maximum purification particle concentration C of the ith stage i The calculation mode of (2) is as follows:
C i ＝f(A i -B i (T))； (2)
wherein B is i (T) represents the number of particles remaining in the room after T minutes of operation in the ith gear in units of one/m 3 ；A i Represents the maximum initial particle number of the ith grade in units of one/m 3 ；p i The purification efficiency corresponding to the ith gear is expressed in units of; e, e i The circulation time required by the air purifier for circulating the room once under the ith grade is expressed as h; q i The purification unevenness corresponding to the ith grade is expressed in units of; w represents the leakage amount of the room, and the unit is that of the room is that of one/min.m 3 ；
Firstly, using the formula (1), taking B i (T) =D, and the maximum initial particle number A of the ith grade is calculated i The method comprises the steps of carrying out a first treatment on the surface of the Reusing the calculated maximum initial particle number A of the ith gear i Substituting the obtained product into a formula (2), and calculating to obtain the maximum purification particle concentration C of the ith grade T minutes i ；
Wherein A is i -B i (T) represents the T minute maximum purification particle count of the ith stage in units of one/m 3 The method comprises the steps of carrying out a first treatment on the surface of the f (·) represents a linear function between the number of particles and the concentration of particles;
in step S3, initial particle concentration C A With the i-th gear operation time t i The construction mode of the functional relation is as follows:
if the initial particle number in the room before the air purifier is started is A, the unit is one/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Then:
the running time of the rotating speed of the fan in the ith gear reaches t i The residual particle number in the room is then B i (t i ) In units of individual/m 3 ；
The rotating speed of the fan of the air purifier is switched to the i-1 th gear operation, and the operation time of the i-1 th gear reaches t i-1 After that, i.e. after the air purifier is operated for T minutes, the residual particle number in the room is B i-1 (t i-1 ) In units of individual/m 3 ；
Wherein p is i 、p i-1 The purification efficiency corresponding to the ith gear and the (i-1) th gear is respectively expressed in units of; e, e i 、e i-1 Respectively representing the circulation time required by the air purifier for circulating the room once in the ith gear and the (i-1) th gear, wherein the unit is h; q i 、q i-1 The corresponding purification non-uniformity of the ith gear and the (i-1) th gear is shown in units; w represents the leakage amount of the room, and the unit is that of the room is that of one/min.m 3 ；
By exhaustive list to obtain t i All possible values of (1) t i <30, and t i Taking B as an integer i-1 (t i-1 ) =d, respectively to t i Each possible value of (2) is calculated, and the initial particle number A is calculated reversely by the formulas (3) and (4) to obtain t i The initial particle number A, i.e. t, corresponding to each possible value of (a) i A; based on a linear function between the particle number and the particle concentrationf (·) calculating initial particle concentration C corresponding to initial particle number A A =f (a), yielding t i Initial particle concentration C corresponding to each possible value A I.e. t i →A→C A Fitting to obtain initial particle concentration C A With the i-th gear operation time t i A functional relationship between;
fitting the resulting initial particle concentration C A With the i-th gear operation time t i The expression of the functional relation is as follows:
wherein x is i 、y i 、z i Are polynomial coefficients; alpha (alpha) i ＝2。
2. The method of claim 1, wherein the cycle time e required for the air cleaner to circulate through the room once in the i-th gear is set to i ＝V/f i The unit is h; wherein V is the room volume in m 3 ；f i The unit is m for the air quantity corresponding to the ith gear 3 /h。
3. The method for controlling the rotational speed of an air purifier according to claim 1, wherein the rotational speed of a fan of the air purifier is switched to the threshold value control method after the air purifier is started and operated for T minutes and the particle number of the space particles is reduced to the set number D.
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