CN111336566B - Adjustable air curtain, control method and range hood - Google Patents
Adjustable air curtain, control method and range hood Download PDFInfo
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- CN111336566B CN111336566B CN202010273413.2A CN202010273413A CN111336566B CN 111336566 B CN111336566 B CN 111336566B CN 202010273413 A CN202010273413 A CN 202010273413A CN 111336566 B CN111336566 B CN 111336566B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000008859 change Effects 0.000 claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 230000000241 respiratory effect Effects 0.000 claims description 11
- 230000001276 controlling effect Effects 0.000 claims description 10
- 239000003344 environmental pollutant Substances 0.000 claims description 9
- 231100000719 pollutant Toxicity 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 238000004364 calculation method Methods 0.000 description 6
- 239000008162 cooking oil Substances 0.000 description 5
- 238000010411 cooking Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003517 fume Substances 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 2
- 238000012938 design process Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
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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
- 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
- F24C15/2028—Removing cooking fumes using an air curtain
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Abstract
The invention relates to an adjustable air curtain, a control method and a range hood, which monitor real-time exhaust air quantity through a sensor arranged in an exhaust pipe or monitoring motor parameters of the range hood, transmit a signal to an air curtain controller, and adjust the rotating speed of an air curtain fan and the direction of a guide vane to change outflow parameters of the air curtain, namely the outflow speed and the angle of the air curtain according to the relationship between the input exhaust air quantity and the outflow parameters of the air curtain. Therefore, the air curtain outflow parameters are correspondingly changed under the condition that the exhaust air volume of the range hood is changed, and the purpose of better realizing the air curtain effect can be achieved.
Description
Technical Field
The invention relates to the field of intelligent control, in particular to an adjustable air curtain, a control method and a range hood.
Background
The range hood is an important local exhaust device in a kitchen and plays a role in removing cooking oil smoke in the kitchen and creating a healthy and comfortable indoor living environment. The trapping performance of the range hood is an important index for evaluating the quality degree of the range hood. There are many methods for improving the trapping performance, such as improving the exhaust amount of the range hood, changing the suction port form of the range hood, and adding a side plate, etc. Air curtain type range hoods are also one way to improve trapping performance. In the design process of the conventional air curtain type range hood, a design method of a fixed parameter type is often adopted, namely the same air curtain outflow parameters are adopted for different exhaust air volume gears of the range hood. Research and practice prove that the air curtain parameters designed aiming at a certain exhaust volume can have the phenomenon that the air curtain is invalid or even has opposite effects when used for other exhaust volumes, cannot play the role of the air curtain and is not beneficial to controlling cooking oil fume in a kitchen. Meanwhile, in practical application, due to the influence of residence flue pressure fluctuation, the exhaust volume of the range hood often deviates from a rated value under a corresponding gear, and the fixed parameter type air curtain cannot adapt to a complex kitchen environment in the cooking process. Therefore, on the basis of designing the air curtain outflow parameters of different exhaust air volumes, the real-time exhaust air volume monitoring range hood is necessary to correspondingly adjust the air curtain outflow parameters.
Disclosure of Invention
The invention aims to provide an adjustable air curtain, a control method and a range hood, which can automatically adjust the outflow parameters of the air curtain according to the real-time exhaust volume of the range hood and maintain a good kitchen environment.
In order to achieve the purpose, the invention provides the following scheme:
an adjustable air curtain, the air curtain comprising:
the air curtain control system comprises an air quantity sensor, an air curtain guide vane, a speed regulating motor, an air curtain fan controller, a variable frequency fan and an air curtain guide vane motor controller;
the air volume sensor is positioned in an exhaust pipeline of the range hood and is used for detecting exhaust volume change parameters in real time; the air exhaust amount variation parameters comprise: the motor speed, the input voltage and the input current of an exhaust motor in the range hood;
the air curtain guide vane is connected with the speed regulating motor, the speed regulating motor drives the air curtain guide vane to rotate, and an air curtain seam adjusting outlet is formed at the front end of the range hood;
the air curtain fan controller is connected with the variable frequency fan and is used for controlling the frequency of the variable frequency fan;
the air curtain guide vane motor controller is connected with the speed regulating motor and is used for controlling the rotating speed of the speed regulating motor.
Optionally, the air curtain further includes:
the air curtain fan controller and the air curtain guide vane motor controller are integrated in the air curtain fan box.
The present invention further provides an adjustable air curtain control method, comprising:
s1: acquiring at least two motor parameters of an exhaust motor of the range hood in the operation process of the range hood; the motor parameters include: the motor speed, the motor input current and the motor input voltage;
s2: acquiring a relation function of the parameters of an exhaust motor and the exhaust volume of the range hood;
s3: determining the exhaust volume of the range hood under the exhaust motor parameter in the step S1 based on the exhaust motor parameter-range hood exhaust volume relation function;
s4: acquiring a relation function of air discharge quantity-air curtain outflow speed and a relation function of air discharge quantity-air curtain outflow angle;
s6: and determining the optimal outflow speed and the optimal outflow angle under the corresponding air discharge quantity based on the air discharge quantity-air curtain outflow speed relation function and the air discharge quantity-air curtain outflow angle relation function.
Since the width of the slit formed by the air curtain is fixed, one air quantity can correspond to the outflow speed of one air curtain.
S7: acquiring a corresponding function of air quantity-frequency of an air curtain fan and a corresponding function of rotating speed-angle of an air curtain guide vane controller;
s8: determining a fan frequency value and a rotating speed value of an adjustable motor under the condition of real-time exhaust volume change based on the corresponding function of the air curtain fan air volume-frequency and the corresponding function of the air curtain guide vane controller rotating speed-angle;
s9: and adjusting the fan frequency and the motor speed based on the fan frequency value and the adjustable motor speed value in the step S8.
Optionally, the relationship function between the exhaust motor parameter and the exhaust volume of the range hood specifically adopts the following formula:
aij＝A1Uij+A2
bij＝B1Uij+B2
cij＝C1Uij+C2wherein Q represents the unit of exhaust volume of the range hood as m3N represents the unit of the motor speed as r/min, U represents the input voltage, i is 1,2,3 … N, N is the number of operating conditions of the motor speed N, j is 1,2,3 … m, and m represents oilWorking condition number, a, b, c, A, of exhaust quantity Q of range hood1,A2,B1,B2,C1,C2The fitting coefficients are represented.
Optionally, the relationship function between the exhaust motor parameter and the exhaust volume of the range hood specifically adopts the following formula:
aij＝A1Iij+A2
bij＝B1Iij+B2
cij＝C1Iij+C2wherein Q represents the unit of exhaust volume of the range hood as m3N represents the unit of the motor speed as r/min, I represents the input current, I is 1,2,3 … N, N represents the number of working conditions of the motor speed N, j is 1,2,3 … m, m represents the number of working conditions of the exhaust air quantity Q of the range hood, a, b, c, a1,A2,B1,B2,C1,C2The fitting coefficients are represented.
Optionally, the relationship function between the air discharge amount and the air curtain outflow speed and the relationship function between the air discharge amount and the air curtain outflow angle specifically adopt the following formulas:
Vopt＝D1Q2+D2Q+D3
αopt＝E1Q2+E2Q+E3wherein V isoptThe unit of the optimal outflow parameter of the air curtain of the range hood is represented as m/s; q represents the unit of exhaust volume of the range hood as m3/h，αoptThe unit of the optimal outflow angle of the air curtain of the range hood is shown as DEG D1,D2,D3,E1,E2,E3The fitting coefficients are represented.
Optionally, the following formula is specifically adopted for the corresponding function of the air quantity-frequency of the air curtain fan and the corresponding function of the rotating speed-angle of the air curtain guide vane controller:
Q′＝F1f+F2
The invention further provides a range hood, which comprises the adjustable air curtain.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention adopts a control mode based on the operation exhaust air volume of the range hood, adopts the air volume sensor for monitoring, has short response time, and has the advantages of flexibility, simplicity, stability and reliability; the invention adopts a set of control device for the air curtain outflow parameters, can adjust the outflow speed and the outflow angle of the air curtain in real time according to the running exhaust air volume, can find the optimal value of the corresponding air curtain outflow parameters under any exhaust air volume, can play the best role in any time, can effectively control the cooking oil fume in a kitchen, maintain good indoor environment and effectively improve the life quality of residents; according to the results of computer simulation and the like, the invention considers the design process of the air curtain outflow parameter of the air curtain type range hood and the adjusting process of the exhaust flow running in real time, carries out detailed research on the air curtain parameter of the range hood, provides the control logic of the adjustable air curtain based on the exhaust flow, solves the problem of adjusting the air curtain under different exhaust flows, explains the mechanism of controlling cooking oil smoke by the air curtain, and provides the control direction of the air curtain outflow parameter of the range hood.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic view of a range hood and an adjustable air curtain according to an embodiment of the present invention;
FIG. 2 is a schematic view of an air curtain guide vane of an embodiment of the present invention as it is closed;
FIG. 3 is a schematic view of an air curtain guide vane of an embodiment of the present invention as it is opened;
FIG. 4 is a simplified schematic of an air curtain fan box according to an embodiment of the present invention;
FIG. 5 is a flow chart of a method for controlling an adjustable air curtain in accordance with an embodiment of the present invention;
FIG. 6 is a diagram showing the relationship between the motor parameters and the exhaust amount of the range hood according to the embodiment of the present invention;
FIG. 7 is a diagram showing a relationship between an optimal outflow speed and an outflow angle for a range hood according to an embodiment of the present invention;
FIG. 8 is a graph of air curtain fan speed versus frequency in accordance with an embodiment of the present invention;
FIG. 9 is a graph of the relationship of torque and angle of a motion controller according to an embodiment of the present invention;
fig. 10(a) -10 (h) are graphs showing kitchen contaminant concentration profiles at different air curtain outflow velocities according to embodiments of the present invention.
Description of the symbols: the device comprises an exhaust pipe 1, an exhaust hood 2, an air curtain fan box 3, an air curtain guide vane 4, an air curtain strip seam outlet 5, an air quantity sensor 6, an air curtain fan controller 7, an air curtain guide vane motor controller 8, a variable frequency fan 9 and a square interface 10.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an adjustable air curtain, a control method and a range hood, which can automatically adjust the outflow parameters of the air curtain according to the real-time exhaust volume of the range hood and maintain a good kitchen environment.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Compared with the traditional range hood, the air curtain type range hood in the prior art has the advantages that an air curtain is additionally arranged on the front side of the range hood, so that the cooking heat plume is prevented from being expanded and scattered at a certain height, and a good kitchen environment is created. However, because of the complex air flow characteristics in the kitchen, the boundary layer of the cooking plume is detached, and the thermal expansion effect is significant, the air curtain outflow parameters (i.e. the air curtain outflow speed and the outflow angle) need to be reasonably selected. Meanwhile, the pressure change situation in the centralized exhaust flue of the residential kitchen is complex, the actual exhaust amount of the range hood is influenced considerably, the actual exhaust amount value may deviate from the set value, the cooking plume characteristics can change corresponding to the exhaust amounts of different range hoods, and the corresponding air curtain outflow parameters also need to be adjusted. The invention aims to solve the problems and provides an adjustable air curtain of a range hood based on operation exhaust volume, which monitors the real-time exhaust volume through a sensor arranged in an exhaust pipe (or through monitoring the parameters of an exhaust motor of the range hood). Meanwhile, the signal is transmitted to an air curtain controller, and the outflow parameters of the air curtain, namely the outflow speed and the angle of the air curtain are changed by adjusting the rotating speed of an air curtain fan and the direction of a guide vane according to the relationship between the input air discharge and the outflow parameters of the air curtain. Therefore, the air curtain outflow parameter is correspondingly changed under the condition that the exhaust air quantity of the range hood is changed, the purpose of better realizing the effect of the air curtain is achieved, and the specific scheme is as follows:
fig. 1 is a schematic structural view of a range hood and an adjustable air curtain according to an embodiment of the invention, and fig. 2 is a schematic structural view of an air curtain guide vane according to an embodiment of the invention when closed; fig. 3 is a schematic view of an air curtain guide vane according to an embodiment of the present invention when opened, as shown in fig. 1 to 3, specifically including: a range hood portion and an adjustable air curtain portion.
Wherein, range hood part includes: an exhaust pipe 1 and a range hood 2;
the adjustable air curtain portion comprises: the air curtain air guide vane type air conditioner comprises an air quantity sensor 6, an air curtain air guide vane 4, a variable frequency fan, an air curtain fan controller 7, a speed regulating motor, an air curtain air guide vane motor controller 8 and an air curtain fan box 3.
Specifically, the air volume sensor 6 is positioned in an exhaust pipe 1 of the range hood and is used for detecting the variation parameter of the exhaust air volume in real time; the air exhaust amount variation parameters comprise: the motor speed, input voltage and input current of the exhaust motor in the range hood.
The air curtain guide vane 4 is connected with the speed regulating motor through a guide rotating shaft, the speed regulating motor drives the air curtain guide vane 4 to rotate, and an air curtain seam adjusting outlet 5 is formed at the front end of the range hood.
The air curtain fan controller 7 is connected with the variable frequency fan and is used for controlling the frequency of the variable frequency fan.
The air curtain guide vane motor controller 8 is connected with the speed regulating motor and is used for controlling the rotating speed of the speed regulating motor.
The air curtain fan controller 7 and the air curtain guide vane motor controller 8 are both integrated into the air curtain fan box 3, as shown in fig. 4.
Fig. 5 is a flowchart of an adjustable air curtain control method according to an embodiment of the present invention, as shown in fig. 5, the method includes:
s1: acquiring at least two motor parameters of an exhaust motor of the range hood in the operation process of the range hood; the motor parameters include: motor speed, motor input current, and motor input voltage.
Specifically, the invention measures at least two motor parameters of the exhaust motor of the range hood through the air volume sensor.
S2: and acquiring a relation function of the parameters of the air exhaust motor and the air exhaust amount of the range hood.
The corresponding relation between the motor parameters and the air exhaust amount is obtained through a performance test experiment of an air exhaust motor of the range hood, the input current and the input voltage of the motor under different conditions are obtained by adjusting the rotating speed of the motor and the air exhaust amount of the range hood, and the relation of Q-N-U or Q-N-I is obtained through fitting, wherein the calculation formula is as follows:
aij＝A1Uij+A2
bij＝B1Uij+B2
cij＝C1Uij+C2wherein Q represents the unit of exhaust volume of the range hood as m3N represents the unit of the motor speed as r/min, U represents the input voltage, i is 1,2,3 … N, N represents the number of operating conditions of the motor speed N, j is 1,2,3 … m, m represents the number of operating conditions of the exhaust air quantity Q of the range hood, a, b, c, a1,A2,B1,B2,C1,C2The fitting coefficients are represented.
Or,
aij＝A1Iij+A2
bij＝B1Iij+B2
cij＝C1Iij+C2wherein Q represents the unit of exhaust volume of the range hood as m3N represents the unit of the motor speed as r/min, I represents the input current, I is 1,2,3 … N, N represents the number of working conditions of the motor speed N, j is 1,2,3 … m, m represents the number of working conditions of the exhaust air quantity Q of the range hood, a, b, c, a1,A2,B1,B2,C1,C2The fitting coefficients are represented.
Fig. 6 is a diagram showing a relationship between motor parameters and an air discharge amount of an air discharge motor of a certain model, and according to data in the diagram, the following formula can be obtained by fitting:
Q＝(0.0534×N1.35+0.324)×102×N-0.12。
s3: and determining the exhaust volume of the range hood under the exhaust motor parameter in the step S1 based on the exhaust motor parameter-range hood exhaust volume relation function.
S4: and acquiring a relation function of air discharge quantity-air curtain outflow speed and a relation function of air discharge quantity-air curtain outflow angle.
The air quantity sensor transmits the monitored air quantity change condition to the air curtain fan controller and the air curtain guide vane motor controller in an electric signal mode. After receiving the air volume signal of the air volume sensor, the controller respectively compares the air volume signal with an air volume-air curtain outflow speed relation function and an air volume-air curtain outflow angle relation function to obtain the optimal outflow speed and outflow angle under the corresponding air volume. The relationship between the exhaust volume of the range hood and the outflow speed and the outflow angle of the air curtain needs to be calculated in advance. The calculation process is as follows: calculating at least 5 air displacement (e.g., 300 m) using commercially available computational fluid dynamics software, such as ANSYS Fluent, STARCCM +, or the like3/h、500m3/h、600m3/h、700m3H and 900m3/h) the condition of pollutant capture of the range hood corresponding to different air curtain outflow parameters, and the pollutant concentration C in the respiratory region of the personbAnd the evaluation is performed as an evaluation index. When the concentration of pollutants in the respiratory region of a person is CbLess than emission concentration C out10 of-4When the air curtain outflow speed is considered to reach the optimum (V) under the exhaust air quantityopt) (ii) a When the concentration of pollutants in the respiratory region of a person is CbLess than emission concentration C out10 of-5When the air curtain outflow angle reaches the optimum (alpha) under the exhaust air quantityopt). Obtaining the relation between the air exhaust volume and the optimal outflow speed and outflow angle of the air curtain, and fitting to obtain Q-V and Q-curves in the following forms:
Vopt＝D1Q2+D2Q+D3
αopt＝E1Q2+E2Q+E3wherein V isoptThe unit of the optimal outflow parameter of the air curtain of the range hood is represented as m/s; q represents the unit of exhaust volume of the range hood as m3/h，αoptAir curtain for indicating range hoodThe optimum outflow angle has the unit of DEG, D1,D2,D3,E1,E2,E3The fitting coefficients are represented.
Fig. 7 shows a simulation of a certain range hood, which can be fit to obtain the following formula:
Vopt＝0.1071Q2+0.1071Q+1.3
αopt＝-0.2143Q2-0.2143Q+6.4
the exhaust volume of the range hood is 600m3For example,/h, the calculation is performed by fixing the outflow angle α and changing the outflow speed V, and the emission concentration is 0.1%. When alpha is not changed, the outflow speed V which can minimize the concentration of the respiratory region of kitchen staff can be obtainedoptAs shown in Table 1, the concentration in the respiratory region was the lowest at an outflow rate of 2.5m/s and was less than 10 of the emission concentration-4. Then the outflow speed is fixed to VoptBy changing the outflow angle alpha, the outflow speed alpha with the lowest concentration in the respiratory region of the kitchen staff can be obtainedoptAs shown in Table 2, the respiratory zone concentration was lowest at an outflow angle of 4 and was less than 10 of the emitted concentration-5。
TABLE 1 Range hood 600m3Relationship between exhaust air volume, outflow speed of air curtain at outflow angle of 8 degrees and concentration of respiratory region
TABLE 2 Range hood 600m3The relationship between the discharge air volume/h, the outflow angle of the air curtain when the outflow speed is 2.5m/s, and the concentration of the respiratory region
Through calculation, the corresponding relation between the exhaust air volume of the range hood and the air curtain outflow parameters can be obtained, as shown in table 3. According to the data in table 3, the curves of the discharge volume-discharge velocity and discharge volume-discharge angle shown in fig. 7 can be obtained by fitting, and the discharge parameters for the remaining discharge volumes can be obtained by the curves, and the two curves are respectively input to the air curtain fan controller and the air curtain guide vane controller.
TABLE 3 optimal discharge parameters of air curtain for different exhaust air volume of range hood
S6: and determining the optimal outflow speed and the optimal outflow angle under the corresponding air discharge quantity based on the air discharge quantity-air curtain outflow speed relation function and the air discharge quantity-air curtain outflow angle relation function.
S7: and acquiring a corresponding function of the air quantity-frequency of the air curtain fan and a corresponding function of the rotating speed-angle of the air curtain guide vane controller.
After the optimal outflow speed and the optimal outflow angle under the corresponding air quantity are obtained, the air curtain fan controller and the air curtain guide vane motor controller determine the frequency value and the motor rotating speed value under the condition through the corresponding relation between the air quantity and the frequency of the air curtain fan and the corresponding relation between the rotating speed and the angle of the air curtain guide vane controller which are input in advance. The relationship between the air quantity and the frequency of the air curtain fan needs to be measured in advance, the frequency value of 5-10 air curtain fans under the outflow air quantity is measured for fitting, and the calculation formula is as follows:
Q′＝F1f+F2wherein Q' represents the air quantity of the air curtain fan and the unit is m3H, F represents the frequency of the air curtain fan motor in Hz, F1,F2The coefficient of fit is represented by the value of,
the relationship between the angle and the torque of the air curtain guide vane motor controller needs to be measured in advance, the relationship between the motor rotating speed and the torque is a linear relationship, the corresponding motor rotating speed values under 5-10 air curtain angles are measured at least, and the angle and rotating speed calculation formula is obtained as follows:
Fig. 8 and 9 are relationships between a certain fan rotation speed and frequency and a certain motor torque and rotation angle, respectively, and fitting equations can be obtained as follows:
Q＝20.013f+18.876
α＝0.31525e0.44(N-20)+0.3875
s8: and determining a fan frequency value and a rotating speed value of the adjustable motor under the condition of real-time exhaust volume change based on the corresponding function of the air curtain fan air volume-frequency and the corresponding function of the air curtain guide vane controller rotating speed-angle.
S9: and adjusting the fan frequency and the motor speed based on the fan frequency value and the adjustable motor speed value in the step S8.
For example, the exhaust air volume of the gears in the range hood on the market is about 600m3At the gear, the exhaust air volume of the residence flue is reduced to 400m due to the pressure fluctuation of the residence flue3And h, monitoring the air volume change value by an air volume sensor arranged on an exhaust pipe of the range hood at the moment, and transmitting signals to the air curtain fan and the guide vane controller. The controller finds 400m according to the corresponding functional relation3At/h, the optimal outflow speed is 1.8m/s, and the optimal outflow angle is 5.5 degrees. At the moment, the frequency of the corresponding air curtain fan is 110 Hz; the torque is 3 Nm/square meter, the corresponding motor rotating speed is 800r/min, the fan frequency converter and the guide vane coupling are correspondingly adjusted, the outflow air speed of the air curtain is reduced, and the guide vane is rotated, so that the aim of adjusting the outflow parameters of the air curtain according to the real-time exhaust air quantity is fulfilled.
Specifically, the control flow in the present invention can be summarized as follows:
when the pressure in the exhaust duct of the house changes to cause the exhaust volume of the range hood to change, the exhaust air volume sensor acquires air volume signals and respectively transmits the air volume signals to the air curtain fan controller and the air curtain guide vane controller. After the fan controller obtains the signal, the rotating speed of the fan is adjusted according to the control logic to change the outflow speed of the air curtain; after the guide vane controller obtains the signal, the angle of the guide vane is adjusted according to the corresponding control logic, so that the outflow angle of the air curtain is changed. The air curtain outflow parameter reaches a reasonable value under the corresponding air discharge amount through the combined action of the two controllers.
FIGS. 10(a) -10 (h) are graphs showing the concentration profiles of the kitchen contaminants at different air curtain outflow speeds, with the air flow rate of 2.0m/s in FIG. 10(a), 2.5m/s in FIG. 10(b), 3.0m/s in FIG. 10(c), 3.5m/s in FIG. 10(d), 4.0m/s in FIG. 10(e), 4.5m/s in FIG. 10(f), 5.0m/s in FIG. 10(g), and 5.5m/s in FIG. 10 (h); under the exhaust air volume, the outflow speed of 2-2.5m/s has a positive effect on controlling kitchen pollutants, the air curtain can effectively prevent cooking oil fume in a kitchen from overflowing, and along with the increase of the outflow speed, the air curtain can not prevent the pollutants from escaping, even accelerate the pollutants to escape, so that the kitchen environment is worse.
The invention also provides a range hood which is characterized by comprising the adjustable air curtain.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. An adjustable air curtain, said air curtain comprising:
the air curtain control system comprises an air quantity sensor, an air curtain guide vane, a speed regulating motor, an air curtain fan controller, a variable frequency fan and an air curtain guide vane motor controller;
the air volume sensor is positioned in an exhaust pipeline of the range hood and is used for detecting exhaust volume change parameters in real time; the air exhaust amount variation parameters comprise: the motor speed, the input voltage and the input current of an exhaust motor in the range hood;
the air curtain guide vane is connected with the speed regulating motor through a guide rotating shaft, the speed regulating motor drives the air curtain guide vane to rotate, and an air curtain seam adjusting outlet is formed at the front end of the range hood;
the air curtain fan controller is connected with the variable frequency fan and is used for controlling the frequency of the variable frequency fan;
the air curtain guide vane motor controller is connected with the speed regulating motor and is used for controlling the rotating speed of the speed regulating motor;
the air curtain fan controller and the air curtain guide vane motor controller are both used for acquiring at least two motor parameters of an exhaust motor of the range hood in the operation process of the range hood; acquiring a relation function of the parameters of an exhaust motor and the exhaust volume of the range hood; determining the exhaust volume of the range hood under the exhaust motor parameter based on the exhaust motor parameter-range hood exhaust volume relation function; acquiring a relation function of air discharge quantity-air curtain outflow speed and a relation function of air discharge quantity-air curtain outflow angle; determining the optimal outflow speed and the optimal outflow angle under the corresponding air discharge quantity based on the air discharge quantity-air curtain outflow speed relation function and the air discharge quantity-air curtain outflow angle relation function; acquiring a corresponding function of air quantity-frequency of an air curtain fan and a corresponding function of rotating speed-angle of an air curtain guide vane controller; determining a fan frequency value and a rotating speed value of an adjustable motor under the condition of real-time exhaust volume change based on the corresponding function of the air curtain fan air volume-frequency and the corresponding function of the air curtain guide vane controller rotating speed-angle; adjusting the fan frequency and the motor rotating speed based on the fan frequency value and the rotating speed value of the adjustable motor;
the relation function of the air discharge quantity-air curtain outflow speed and the relation function of the air discharge quantity-air curtain outflow angle are determined according to the pollutant concentration in the respiratory region of a person.
2. The adjustable air curtain of claim 1 further comprising:
the air curtain fan controller and the air curtain guide vane motor controller are integrated in the air curtain fan box.
3. An adjustable air curtain control method, comprising:
s1: acquiring at least two motor parameters of an exhaust motor of the range hood in the operation process of the range hood; the motor parameters include: the motor speed, the motor input current and the motor input voltage;
s2: acquiring a relation function of the parameters of an exhaust motor and the exhaust volume of the range hood;
s3: determining the exhaust volume of the range hood under the exhaust motor parameter in the step S1 based on the exhaust motor parameter-range hood exhaust volume relation function;
s4: acquiring a relation function of air discharge quantity-air curtain outflow speed and a relation function of air discharge quantity-air curtain outflow angle; the air discharge quantity-air curtain outflow speed relation function and the air discharge quantity-air curtain outflow angle relation function are determined according to the pollutant concentration in the respiratory region of a person;
s5: determining the optimal outflow speed and the optimal outflow angle under the corresponding air discharge quantity based on the air discharge quantity-air curtain outflow speed relation function and the air discharge quantity-air curtain outflow angle relation function;
s6: acquiring a corresponding function of air quantity-frequency of an air curtain fan and a corresponding function of rotating speed-angle of an air curtain guide vane controller;
s7: determining a fan frequency value and a rotating speed value of an adjustable motor under the condition of real-time exhaust volume change based on the corresponding function of the air curtain fan air volume-frequency and the corresponding function of the air curtain guide vane controller rotating speed-angle;
s8: and adjusting the fan frequency and the motor speed based on the fan frequency value and the adjustable motor speed value in the step S7.
4. The adjustable air curtain control method according to claim 3, wherein the relationship function between the parameters of the exhaust motor and the exhaust volume of the range hood specifically adopts the following formula:
aij＝A1Uij+A2
bij＝B1Uij+B2
cij＝C1Uij+C2wherein Q represents the unit of exhaust volume of the range hood as m3N represents the unit of the motor speed as r/min, U represents the input voltage, i is 1,2,3 … N, N represents the number of operating conditions of the motor speed N, j is 1,2,3 … m, m represents the number of operating conditions of the exhaust air quantity Q of the range hood, a, b, c, a1,A2,B1,B2,C1,C2The fitting coefficients are represented.
5. The adjustable air curtain control method according to claim 3, wherein the relationship function between the parameters of the exhaust motor and the exhaust volume of the range hood specifically adopts the following formula:
aij＝A1Iij+A2
bij＝B1Iij+B2
cij＝C1Iij+C2wherein Q represents the unit of exhaust volume of the range hood as m3N represents the unit of the motor speed as r/min, I represents the input current, I is 1,2,3 … N, N is the number of operating conditions of the motor speed N, and j is 1,2,3 … mM represents the working condition number of the exhaust quantity Q of the range hood, a, b, c, A1,A2,B1,B2,C1,C2The fitting coefficients are represented.
6. The adjustable air curtain control method of claim 3, wherein the relationship function of discharge air volume-air curtain outflow velocity and the relationship function of discharge air volume-air curtain outflow angle are defined by the following equations:
Vopt＝D1Q2+D2Q+D3
αopt＝E1Q2+E2Q+E3wherein V isoptThe unit of the optimal outflow parameter of the air curtain of the range hood is represented as m/s; q represents the unit of exhaust volume of the range hood as m3/h，αoptThe unit of the optimal outflow angle of the air curtain of the range hood is shown as DEG D1,D2,D3,E1,E2,E3The fitting coefficients are represented.
7. The adjustable air curtain control method of claim 3, wherein the corresponding function of air curtain fan air volume-frequency and the corresponding function of air curtain guide vane controller rotational speed-angle are specifically defined by the following equations:
Q′＝F1f+F2
8. A range hood, characterized in that it comprises an adjustable air curtain as claimed in any one of claims 1-2.
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