CN111336566B - Adjustable air curtain, control method and range hood - Google Patents

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

An adjustable air curtain and control method, and a range hood

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 technique

The range hood is an important local exhaust equipment in the kitchen, which plays the role of eliminating cooking fumes in the kitchen and creating a healthy and comfortable indoor living environment. Among them, the collection performance of the range hood is an important index to evaluate the pros and cons of the range hood. There are many ways to improve the capture performance, such as increasing the exhaust air volume of the range hood, changing the form of the suction port of the range hood, and adding side panels, etc. Air curtain range hoods are also a way to improve capture performance. In the design process of the air curtain type range hood in the past, the fixed parameter design method is often used, that is, the same air curtain outflow parameters are used for different range hood exhaust air volume gears. Research and practice have proved that the air curtain parameters designed for a certain exhaust air volume will be ineffective or even have the opposite effect when used for other exhaust air volumes. Control of cooking fumes. At the same time, in practical applications, due to the influence of flue pressure fluctuations in the residential flue, the exhaust air volume of the range hood often deviates from the rated value of the corresponding gear, and the fixed-parameter air curtain cannot adapt to the complex kitchen environment during the cooking process. Therefore, on the basis of designing the air curtain outflow parameters of different exhaust air volumes, it is necessary to monitor the real-time exhaust air volume of the range hood to adjust the air curtain outflow parameters accordingly.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an adjustable air curtain, a control method and a range hood, which can automatically adjust the air curtain outflow parameters according to the real-time exhaust air volume of the range hood to maintain a good kitchen environment.

For achieving the above object, the present invention provides the following scheme:

An adjustable air curtain comprising:

Air volume sensor, air curtain guide vane, speed regulating motor, air curtain fan controller, variable frequency fan and air curtain guide vane motor controller;

The air volume sensor is located in the exhaust duct of the range hood, and is used for real-time detection of the variation parameter of the exhaust air volume; the variation parameter of the exhaust air volume includes: the motor speed, the input voltage and the input current of the exhaust motor in the range hood;

The air curtain guide vane is connected with the speed regulating motor, and the air curtain guide vane is driven to rotate by the speed regulating motor, and an air curtain adjusting slot 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 to control 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 rotational speed of the speed regulating motor.

Optionally, the air curtain further includes:

The air curtain fan box, the air curtain fan controller and the air curtain guide vane motor controller are all integrated in the air curtain fan box.

The present invention additionally provides an adjustable air curtain control method, the control method comprising:

S1: Acquire at least two motor parameters of the exhaust motor of the range hood during operation of the range hood; the motor parameters include: motor speed, motor input current, and motor input voltage;

S2: Obtain the relationship function between the parameters of the exhaust motor and the exhaust air volume of the range hood;

S3: Determine the exhaust air volume of the range hood under the parameters of the exhaust motor described in the step S1 based on the relationship function between the exhaust motor parameters and the exhaust air volume of the range hood;

S4: Obtain the relation function of exhaust air volume-air curtain outflow velocity and the relation function of exhaust air volume-air curtain outflow angle;

S6: Determine the optimal outflow speed and the optimal outflow angle at the corresponding air exhaust volume based on the exhaust air volume-air curtain outflow velocity relationship function and the exhaust air volume-air curtain outflow angle relationship function.

Since the width of the slit formed by the air curtain is fixed, one air volume can be determined to correspond to one air curtain outflow velocity.

S7: Obtain the corresponding function of the air volume-frequency of the air curtain fan and the corresponding function of the rotation speed-angle of the air curtain guide vane controller;

S8: Determine the fan frequency value and the speed value of the adjustable motor under the situation of real-time exhaust air volume change based on the corresponding function of the air volume-frequency of the air curtain fan and the rotation speed-angle corresponding function of the air curtain guide vane controller;

S9: Adjust the fan frequency and the motor speed based on the fan frequency value and the rotational speed value of the adjustable motor in the step S8.

Optionally, the relationship function between the parameters of the exhaust motor and the exhaust air volume of the range hood specifically adopts the following formula:

a _ij =A ₁ U _ij +A ₂

b _ij =B ₁ U _ij +B ₂

c _ij =C ₁ U _ij +C ₂ , where Q represents the exhaust air volume of the range hood in m ³ /h, N represents the motor speed in r/min, U represents the input voltage, i=1,2,3… n, n is the number of working conditions of the motor speed N, j=1, 2, 3...m, m is the number of working conditions of the exhaust air volume Q of the range hood, a, b, c, A ₁ , A ₂ , B ₁ , B ₂ , C ₁ , and C ₂ represent fitting coefficients.

Optionally, the relationship function between the parameters of the exhaust motor and the exhaust air volume of the range hood specifically adopts the following formula:

a _ij =A ₁ I _ij +A ₂

b _ij =B ₁ I _ij +B ₂

c _ij =C ₁ I _ij +C ₂ , where Q represents the exhaust air volume of the range hood in m ³ /h, N represents the motor speed in r/min, I represents the input current, i=1, 2, 3… n, n is the number of working conditions of the motor speed N, j=1, 2, 3...m, m is the number of working conditions of the exhaust air volume Q of the range hood, a, b, c, A ₁ , A ₂ , B ₁ , B ₂ , C ₁ , and C ₂ represent fitting coefficients.

Optionally, the exhaust air volume-air curtain outflow velocity relationship function and the exhaust air volume-air curtain outflow angle relationship function specifically adopt the following formulas:

V _opt =D ₁ Q ² +D ₂ Q+D ₃

α _opt =E ₁ Q ² +E ₂ Q+E ₃ , where V _opt indicates that the unit of the optimal outflow parameter of the range hood air curtain is m/s; Q indicates that the unit of the exhaust air volume of the range hood is m ³ /h, and α _opt indicates that the unit of the optimal outflow angle of the air curtain of the range hood is °, and D ₁ , D ₂ , D ₃ , E ₁ , E ₂ , and E ₃ indicate the fitting coefficients.

Optionally, the corresponding function of the air volume-frequency of the air curtain fan and the corresponding function of the rotation speed-angle of the air curtain guide vane controller specifically adopt the following formula:

Q'=F ₁ f+F ₂

其中，Q′表示空气幕风机风量，单位为m³/h，f表示空气幕风机电机频率，单位为Hz，F₁,F₂表示拟合系数，α表示空气幕出流角度单位为°，N表示空气幕导流叶片电机转速r/min，G₁,G₂,G₃,N₀表示拟合系数。

Among them, Q' represents the air volume of the air curtain fan, the unit is m ³ /h, f is the motor frequency of the air curtain fan, the unit is Hz, F ₁ , F ₂ represent the fitting coefficient, α represents the air curtain outflow angle, the unit is °, N represents the motor speed r/min of the air curtain guide vane, and G ₁ , G ₂ , G ₃ , and N ₀ represent the fitting coefficients.

The present invention further provides a range hood comprising the above-mentioned adjustable air curtain.

According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

The present invention adopts the control method based on the operating exhaust volume of the range hood, adopts the air volume sensor for monitoring, has the advantages of short response time, flexibility, simplicity, stability and reliability; the present invention adopts a complete set of control devices for the air curtain outflow parameters, which can Running the exhaust air volume adjusts the outflow speed and outflow angle of the air curtain in real time, and can find the optimal value of the air curtain outflow parameter corresponding to it under any exhaust air volume, and the air curtain can play the best role at any time. It can effectively control the cooking fumes in the kitchen, maintain a good indoor environment, and effectively improve the quality of life of residents; the invention takes into account the design process of the air curtain outflow parameters of the air curtain type range hood and the real-time operation according to the results of computer simulation and simulation. In the process of adjusting the exhaust air volume, the parameters of the air curtain of the range hood are studied in detail, and the control logic of the adjustable air curtain based on the exhaust air volume is put forward, and it is clarified whether the air curtain is adjusted under different exhaust air volumes and how to adjust it. ” problem, clarifies the mechanism of air curtain controlling cooking fumes, and provides the control direction of the air curtain outflow parameters of the range hood.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative labor.

1 is a schematic structural diagram of a range hood and an adjustable air curtain according to an embodiment of the present invention;

Fig. 2 is the schematic diagram when the air curtain guide vane is closed according to the embodiment of the present invention;

3 is a schematic diagram of the air curtain guide vanes when the embodiment of the present invention is opened;

4 is a schematic diagram of an air curtain fan box according to an embodiment of the present invention;

5 is a flowchart of an adjustable air curtain control method according to an embodiment of the present invention;

6 is a diagram showing the relationship between the motor parameters and the exhaust air volume of the range hood according to the embodiment of the present invention;

7 is a diagram showing the relationship between the optimal outflow velocity and the outflow angle of the range hood under different exhaust air volumes according to the embodiment of the present invention;

8 is a diagram showing the relationship between the rotational speed and frequency of an air curtain fan according to an embodiment of the present invention;

FIG. 9 is a diagram showing the relationship between torque and angle of a motion controller according to an embodiment of the present invention;

FIG. 10(a)-FIG. 10(h) are the concentration distribution diagrams of pollutants in the kitchen under different air curtain outflow velocities according to the embodiment of the present invention.

Symbol description: 1-exhaust duct, 2-range hood, 3-air curtain fan box, 4-air curtain guide vane, 5-air curtain slit outlet, 6-air volume sensor, 7-air curtain fan controller , 8- air curtain guide vane motor controller, 9- frequency conversion fan, 10- square interface.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The purpose of the present invention is to provide an adjustable air curtain, a control method and a range hood, which can automatically adjust the air curtain outflow parameters according to the real-time exhaust air volume of the range hood to maintain a good kitchen environment.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Compared with the traditional range hood, the air curtain type range hood in the prior art adds an air curtain to the front side of the range hood to prevent the cooking heat plume from expanding and spreading at a certain height and creating a good kitchen environment. However, due to the complex air flow characteristics in the kitchen, the boundary layer of the cooking plume is detached, and the thermal expansion effect is significant. Therefore, the outflow parameters of the air curtain (ie, the outflow velocity and the outflow angle of the air curtain) need to be reasonably selected. At the same time, the pressure changes in the centralized exhaust duct of the residential kitchen are complex, which has a considerable impact on the actual exhaust air volume of the range hood. The characteristics will change, and the corresponding air curtain outflow parameters should also be adjusted. In view of the above problems, the present invention aims to propose an adjustable air curtain for a range hood based on the operating exhaust volume, which can monitor the real-time exhaust air volume through a sensor installed in the exhaust duct (or by monitoring the parameters of the range hood exhaust motor). . At the same time, the signal is transmitted to the air curtain controller, and according to the relationship between the input exhaust air volume and the air curtain outflow parameters, the air curtain fan speed and the direction of the guide vanes are adjusted to change the air curtain outflow parameters, that is, the air curtain outflow parameters. Flow speed and angle. Therefore, under the condition that the exhaust air volume of the range hood changes, the outflow parameters of the air curtain can be changed correspondingly, so as to achieve the purpose of better realizing the effect of the air curtain. The specific scheme is as follows:

1 is a schematic structural diagram of a range hood and an adjustable air curtain according to an embodiment of the present invention, FIG. 2 is a schematic diagram of an embodiment of the present invention when the air curtain guide vanes are closed; FIG. 3 is a schematic view of an embodiment of the present invention when the air curtain guide vanes are opened, As shown in Figures 1-3, it specifically includes: a range hood part and an adjustable air curtain part.

Among them, the range hood part includes: exhaust pipe 1, range hood 2;

The adjustable air curtain part includes: air volume sensor 6, air curtain guide vane 4, variable frequency fan, air curtain fan controller 7, speed regulating motor, air curtain guide vane motor controller 8, and air curtain fan box 3.

Specifically, the air volume sensor 6 is located in the exhaust duct 1 of the range hood, and is used to detect the variation parameters of the exhaust air volume in real time; the variation parameters of the exhaust air volume include: the motor speed of the exhaust motor in the range hood, the input voltage and input current.

The air curtain guide vane 4 is connected with the speed regulating motor through a guide shaft, and the air curtain guide vane 4 is driven by the speed regulating motor to rotate, and an air curtain adjustment slot 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 to control the frequency of the variable frequency fan.

The air curtain guide vane motor controller 8 is connected to the speed regulating motor for controlling the rotational speed of the speed regulating motor.

Both the air curtain fan controller 7 and the air curtain guide vane motor controller 8 are integrated in 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: Acquire at least two motor parameters of the exhaust motor of the range hood during operation of the range hood; the motor parameters include: motor speed, motor input current, and motor input voltage.

Specifically, in the present invention, at least two motor parameters of the exhaust motor of the range hood are measured through the air volume sensor.

S2: Obtain the relationship function between the parameters of the exhaust motor and the exhaust air volume of the range hood.

Among them, the corresponding relationship between the motor parameters and the exhaust air volume is obtained through the performance test experiment of the exhaust fan of the range hood. By adjusting the motor speed and the exhaust air volume of the range hood, the input current and input voltage of the motor under different conditions are obtained, and Q-N-U or Q-N-I is obtained by fitting. relationship, the calculation formula is as follows:

a _ij =A ₁ U _ij +A ₂

b _ij =B ₁ U _ij +B ₂

c _ij =C ₁ U _ij +C ₂ , where Q represents the exhaust air volume of the range hood in m ³ /h, N represents the motor speed in r/min, U represents the input voltage, i=1,2,3… n, n is the number of working conditions of the motor speed N, j=1, 2, 3...m, m is the number of working conditions of the exhaust air volume Q of the range hood, a, b, c, A ₁ , A ₂ , B ₁ , B ₂ , C ₁ , and C ₂ represent fitting coefficients.

or,

a _ij =A ₁ I _ij +A ₂

b _ij =B ₁ I _ij +B ₂

c _ij =C ₁ I _ij +C ₂ , where Q represents the exhaust air volume of the range hood in m ³ /h, N represents the motor speed in r/min, I represents the input current, i=1, 2, 3… n, n is the number of working conditions of the motor speed N, j=1, 2, 3...m, m is the number of working conditions of the exhaust air volume Q of the range hood, a, b, c, A ₁ , A ₂ , B ₁ , B ₂ , C ₁ , and C ₂ represent fitting coefficients.

Figure 6 shows the relationship between the motor parameters of a certain type of exhaust motor and the exhaust air volume. According to the data in the figure, the following formula can be obtained by fitting:

Q=(0.0534×N ^1.35 +0.324)×10 ² ×N ^−0.12 .

S3: Determine the exhaust air volume of the range hood under the parameters of the exhaust motor described in the step S1 based on the relationship function between the parameters of the exhaust motor and the exhaust air volume of the range hood.

S4: Obtain the relationship function between the exhaust air volume and the outflow velocity of the air curtain and the relationship function between the exhaust air volume and the outflow angle of the air curtain.

The air volume sensor transmits the monitored air volume changes to the air curtain fan controller and the air curtain guide vane motor controller in the form of electrical signals. After receiving the air volume signal from the air volume sensor, the controller compares it with the relationship function of the exhaust air volume-air curtain outflow velocity and the exhaust air volume-air curtain outflow angle relationship function respectively, and obtains the optimal outflow speed under the corresponding exhaust air volume. and outflow angle. Among them, the relationship between the exhaust air volume of the range hood and the outflow speed and outflow angle of the air curtain needs to be calculated in advance. The calculation process is as follows: use commercial computational fluid dynamics software, such as ANSYS Fluent, STARCCM+, etc., to calculate at least 5 exhaust air volumes (such as 300m ³ /h, 500m ³ /h, 600m ³ /h, 700m ³ /h and 900m ³ /h h) The pollutant capture situation of the range hood corresponding to different air curtain outflow parameters, and the pollutant concentration C _b in the breathing zone of the personnel is used as the evaluation index for evaluation. When the pollutant concentration C _b in the personnel breathing zone is less than 10 ^-4 of the emission concentration C _out , it is considered that the outflow velocity of the air curtain reaches the optimum (V _opt ) under the exhaust air volume; when the pollutant concentration C _b in the personnel breathing zone is less than When the emission concentration C _out is 10 ⁻⁵ , it is considered that the outflow angle of the air curtain reaches the optimum (α _opt ) under the exhaust air volume. The relationship between the exhaust air volume and the optimal outflow velocity and outflow angle of the air curtain is obtained, and the QV and Q-curves are obtained by fitting, and the forms are as follows:

V _opt =D ₁ Q ² +D ₂ Q+D ₃

α _opt =E ₁ Q ² +E ₂ Q+E ₃ , where V _opt indicates that the unit of the optimal outflow parameter of the range hood air curtain is m/s; Q indicates that the unit of the exhaust air volume of the range hood is m ³ /h, and α _opt indicates that the unit of the optimal outflow angle of the air curtain of the range hood is °, and D ₁ , D ₂ , D ₃ , E ₁ , E ₂ , and E ₃ indicate the fitting coefficients.

Figure 7 The simulated situation of a range hood, the formula can be obtained by fitting as follows:

V _opt =0.1071Q ² +0.1071Q+1.3

α _opt = -0.2143Q ² -0.2143Q+6.4

Taking the exhaust air volume of the range hood as 600m ³ /h as an example, the method of first fixing the outflow angle α and changing the outflow velocity V was adopted in the calculation, and the emission concentration was 0.1% in the calculation. When α is constant, the outflow velocity V _opt that minimizes the concentration in the breathing zone of the kitchen personnel can be obtained, as shown in Table 1. When the outflow velocity is 2.5m/s, the concentration in the breathing zone is the lowest, and is less than 10 ^{− 4} . Then, the outflow velocity is fixed as V _opt , and the outflow angle α is changed to obtain the outflow velocity α _opt that minimizes the concentration in the breathing zone of the kitchen staff, as shown in Table 2, where the concentration in the breathing zone is the lowest when the outflow angle is 4°, and less than 10 ^-5 of the emission concentration.

Table 1. The relationship between the exhaust air volume of the range hood at 600m ³ /h, the outflow velocity of the air curtain at an outflow angle of 8° and the concentration in the breathing zone

Table 2. The relationship between the exhaust air volume of the range hood at 600m ³ /h, the outflow angle of the air curtain and the concentration in the breathing zone when the outflow velocity of the air curtain is 2.5m/s

Through the calculation, the corresponding relationship between the exhaust air volume of the range hood and the outflow parameters of the air curtain can be obtained, as shown in Table 3. According to the data in Table 3, the curves of exhaust air volume-outflow velocity and exhaust air volume-outflow angle as shown in Figure 7 can be obtained by fitting, and the outflow parameters at other exhaust air volumes can be obtained from this curve, and Input the two curves into the air curtain fan controller and the air curtain guide vane controller respectively.

Table 3. Optimal outflow parameters of air curtain under different exhaust air volume of range hood

S6: Determine the optimal outflow speed and the optimal outflow angle at the corresponding air exhaust volume based on the exhaust air volume-air curtain outflow velocity relationship function and the exhaust air volume-air curtain outflow angle relationship function.

S7: Obtain the corresponding function of the air volume-frequency of the air curtain fan and the corresponding function of the rotation speed-angle of the air curtain guide vane controller.

After obtaining the optimal outflow speed and outflow angle under the corresponding air volume, the air curtain fan controller and the air curtain guide vane motor controller input the air volume-frequency correspondence of the air curtain fan in advance, and the air curtain guide vane The corresponding relationship between controller speed and angle, to determine the frequency value and motor speed value in this case. Among them, the relationship between the air volume and the frequency of the air curtain fan needs to be measured in advance. At least 5-10 frequency values under the air volume of the air curtain fan are measured for fitting. The calculation formula is as follows:

Q'=F ₁ f+F ₂ , where Q' represents the air volume of the air curtain fan, the unit is m ³ /h, f is the motor frequency of the air curtain fan, the unit is Hz, F ₁ , F ₂ represent the fitting coefficient,

The relationship between the angle and torque of the air curtain guide vane motor controller needs to be measured in advance. The relationship between the motor speed and torque is a linear relationship. At least 5-10 motor speed values corresponding to the air curtain angle are measured, and the angle and speed are calculated. The formula is as follows:

其中，α表示空气幕出流角度单位为°，N表示空气幕导流叶片电机转速r/min，G₁,G₂,G₃,N₀表示拟合系数。

Among them, α represents the air curtain outflow angle in °, N represents the motor speed r/min of the air curtain guide vane, and G ₁ , G ₂ , G ₃ , and N ₀ represent the fitting coefficients.

Figure 8 and Figure 9 respectively show the relationship between the speed and frequency of a fan and the torque and rotation angle of a motor. The fitting formula can be obtained as follows:

Q=20.013f+18.876

α=0.31525e ^0.44 (N-20)+0.3875

S8: Determine the fan frequency value and the rotational speed value of the adjustable motor when the real-time exhaust air volume changes based on the air volume-frequency correspondence function of the air curtain fan and the air curtain guide vane controller rotational speed-angle correspondence function.

S9: Adjust the fan frequency and the motor speed based on the fan frequency value and the rotational speed value of the adjustable motor in the step S8.

For example, the exhaust air volume of the range hood in the market is about 600m ³ /h. In this range, the exhaust air volume is reduced to 400m ³ /h due to the fluctuation of the residential flue pressure. The air volume sensor on the air duct monitors the value of the air volume change and transmits the signal to the air curtain fan and guide vane controller. According to the corresponding functional relationship, the controller finds that under 400m ³ /h, the optimal outflow velocity is 1.8m/s, and the optimal outflow angle is 5.5°. At this time, the corresponding air curtain fan frequency is 110Hz; the torque is 3Nm/㎡, and the corresponding motor speed is 800r/min. Flow blades to achieve the purpose of adjusting the outflow parameters of the air curtain according to the real-time exhaust air volume.

Specifically, the control flow in the present invention can be summarized as follows:

When the pressure in the residential exhaust duct changes and the exhaust air volume of the range hood changes, the exhaust air volume sensor obtains the air volume signal and transmits it to the air curtain fan controller and the air curtain guide vane controller respectively. After the fan controller gets the signal, it will adjust the speed of the fan according to the control logic to change the outflow speed of the air curtain; after the guide vane controller obtains the signal, it also adjusts the angle of the guide vane according to the corresponding control logic, thereby changing the air curtain Outflow angle. Through the joint action of the two controllers, the outflow parameters of the air curtain can reach a reasonable value under the corresponding exhaust air volume.

Figure 10(a)-Figure 10(h) show the concentration distribution of kitchen pollutants under different air curtain flow velocities, the air velocity in Figure 10(a) is 2.0m/s, and the air velocity in Figure 10(b) is 2.5m/s, the air velocity of Fig. 10(c) is 3.0m/s, the air velocity of Fig. 10(d) is 3.5m/s, the air velocity of Fig. 10(e) is 4.0m/s, Fig. 10 The air velocity of (f) is 4.5m/s, the air velocity of Fig. 10(g) is 5.0m/s, and the air velocity of Fig. 10(h) is 5.5m/s; it can be seen that under this exhaust air volume, The outflow speed of 2-2.5m/s has a positive effect on the control of pollutants in the kitchen. The air curtain can effectively prevent the escape of cooking fumes in the kitchen. With the increase of the outflow speed, the air curtain cannot prevent the escape of pollutants. , and even accelerate its escape, making the kitchen environment even worse.

The present invention further provides a range hood, characterized in that the range hood includes the above-mentioned adjustable air curtain.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

In this paper, specific examples are used to illustrate the principles and implementations of the present invention. The descriptions of the above embodiments are only used to help understand the methods and core ideas of the present invention; meanwhile, for those skilled in the art, according to the present invention There will be changes in the specific implementation and application scope. In conclusion, the contents of this specification should not be construed as limiting the present 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:

a_ij＝A₁U_ij+A₂

b_ij＝B₁U_ij+B₂

c_ij＝C₁U_ij+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:

a_ij＝A₁I_ij+A₂

b_ij＝B₁I_ij+B₂

c_ij＝C₁I_ij+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:

V_opt＝D₁Q²+D₂Q+D₃

α_opt＝E₁Q²+E₂Q+E₃wherein V is_optThe 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，α_optThe 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

wherein 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,F₂Expressing the fitting coefficient, alpha expressing the unit of the air curtain outflow angle, N expressing the motor speed r/min and G₁,G₂,G₃,N₀The fitting coefficients are represented.

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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