CN114623481A

CN114623481A - Central range hood system and control method and control device thereof

Info

Publication number: CN114623481A
Application number: CN202210379630.9A
Authority: CN
Inventors: 任富佳; 李富强; 陈晓伟; 杜溢斐
Original assignee: Hangzhou Robam Appliances Co Ltd
Current assignee: Hangzhou Robam Appliances Co Ltd
Priority date: 2022-04-12
Filing date: 2022-04-12
Publication date: 2022-06-14

Abstract

The invention discloses a central range hood system and a control method and a control device thereof. The control method comprises the steps of obtaining current working condition information, wherein the working condition information comprises the gear of the starting terminal machine, the target air exhaust volume of the starting terminal machine under the gear and the number of the starting terminal machines under each gear; determining the maximum exhaust power requirement value of the starting terminal according to the current working condition information; determining the target operation frequency of the main engine according to the maximum exhaust power requirement value; and the control host runs at the target running frequency. The target operation frequency of the host is finally determined according to the gear of the starting terminal, the target air exhaust volume of the starting terminal in the gear and the number of the starting terminals in each gear, so that the host operates at a proper frequency, and the starting terminals in different gears can reach the corresponding target air exhaust volume, thereby meeting the air exhaust requirements of users on various floors in different cooking scenes.

Description

Central range hood system and control method and control device thereof

Technical Field

The invention relates to the technical field of central range hoods, in particular to a central range hood system and a control method and a control device thereof.

Background

The central range hood system realizes smoke discharge of each floor by power generated by a fan arranged at the top end of the public flue and matching with a smoke discharge mode with balanced flow distribution.

In the prior art, a control method of a central range hood system comprises the following steps:

1. the central range hood system sets a system exhaust air volume, and under different working conditions, all the starting floors are controlled to reach the system exhaust air volume, so that the ideal single exhaust air volume is ensured on all the starting floors under different working conditions.

2. The central range hood system determines the effective air exhaust amount corresponding to the current start-up rate according to the current start-up rate, wherein the effective air exhaust amount set by the system is larger under the low start-up rate, the effective air exhaust amount set by the system is smaller under the high start-up rate, and each start-up floor is controlled to reach the effective air exhaust amount corresponding to the current start-up rate under the current start-up rate, so that the start-up floors can reach ideal effective air exhaust amount under different start-up rates.

In the control method, the set air exhaust volume of each floor is the same, but in practical application, different floors may be in different cooking scenes, and different air exhaust volume requirements exist in different cooking scenes, for example, when cooking is performed, the oil smoke volume is small, and the required air exhaust volume is small; when frying and cooking, the oil smoke amount is large, and the required exhaust amount is large. Therefore, the scheme of setting the air discharge quantity to be the same for each floor in the prior art can cause the problem of insufficient or excessive air discharge quantity for partial floors.

Disclosure of Invention

The invention provides a central range hood system, a control method and a control device thereof, which are used for meeting the air exhaust requirements of users on all floors in different cooking scenes.

According to one aspect of the invention, a control method of a central range hood system is provided, which is applied to the central range hood system, the central range hood system comprises a common flue, a host computer positioned at an outlet of the common flue and terminal computers positioned on each floor, and the terminal computers on each floor are connected with the common flue;

the control method comprises the following steps:

acquiring current working condition information, wherein the working condition information comprises the gear of a starting terminal machine, the target air exhaust volume of the starting terminal machine under the gear and the number of the starting terminal machines under each gear;

determining the maximum exhaust power requirement value of the starting terminal machine according to the current working condition information;

determining the target operation frequency of the main engine according to the maximum exhaust power requirement value;

and controlling the host to operate at the target operation frequency.

Optionally, determining the maximum exhaust power requirement value of the starting terminal according to the current working condition information includes:

determining an air exhaust resistance value of each starting-up terminal when the target air exhaust volume of each starting-up terminal is reached according to the current working condition information;

aiming at each starting terminal, determining an exhaust power requirement value of the starting terminal according to the exhaust resistance value of the starting terminal and a wind pressure value provided by the starting terminal under the gear;

and determining the maximum exhaust power requirement value as the maximum exhaust power requirement value.

Optionally, determining the target operating frequency of the main engine according to the maximum exhaust power demand value includes:

when the maximum exhaust power requirement value is larger than 0, determining the working point information of the host according to the maximum exhaust power requirement value and the current working condition information, wherein the working point information comprises an air volume value and an air pressure value of the host at the working point;

and determining the target operation frequency of the host according to the operating point information.

Optionally, determining the target operating frequency of the host according to the operating point information includes:

determining a resistance coefficient of the host at the working point according to the working point information;

and determining the target operating frequency of the host according to the resistance coefficient and the preset reference frequency of the host.

Optionally, the preset reference frequency includes a default reference frequency;

determining a target operating frequency of the host according to the resistance coefficient and a preset reference frequency of the host, wherein the method comprises the following steps:

determining a default reference air volume value of the host at a default reference frequency according to the resistance coefficient;

and determining the target operation frequency of the host according to the air volume value of the host at the working point, the default reference frequency and the default reference air volume value.

Optionally, the preset reference frequency further includes at least one backup reference frequency;

after determining the target operation frequency of the host according to the air volume value of the host at the working point, the default reference frequency and the default reference air volume value, the method further comprises the following steps:

when the target operating frequency is located outside a default effective frequency range corresponding to the default reference frequency, confirming the standby reference frequency according to the target operating frequency;

determining the standby reference air discharge quantity of the host under the standby reference frequency according to the resistance coefficient;

determining the target operation frequency of the host according to the air volume value of the host at the working point, the standby reference frequency and the standby reference air discharge volume;

wherein the alternate reference frequency is outside the default valid frequency range.

and when the maximum exhaust power requirement value is less than or equal to 0, determining that the target operation frequency of the main engine is 0.

Optionally, the central extractor hood system further includes a power distribution valve located on each floor, and the terminal machine on each floor is connected with the common flue through the power distribution valve;

after determining the maximum exhaust power requirement value of the starting terminal machine according to the current working condition information, the method further comprises the following steps:

when the maximum exhaust power requirement value is less than or equal to 0, determining that the target opening degree of the power distribution valve corresponding to the starting terminal machine is 90 degrees;

when the maximum exhaust power requirement value is greater than 0, determining a target resistance coefficient of the power distribution valve corresponding to each starting terminal according to the maximum exhaust power requirement value;

determining a target opening degree of the power distribution valve according to the target resistance coefficient;

and controlling the power distribution valve to execute the target opening degree.

According to another aspect of the present invention, a control device of a central range hood system is provided, which is applied to the central range hood system, the central range hood system includes a common flue, a host located at an outlet of the common flue, and terminal machines located on each floor, and the terminal machines on each floor are connected with the common flue;

the control device includes:

the system comprises a working condition information acquisition module, a data processing module and a data processing module, wherein the working condition information acquisition module is used for acquiring current working condition information, and the working condition information comprises the gear of a starting terminal machine, the target air exhaust volume of the starting terminal machine under the gear and the number of the starting terminal machines under each gear;

the maximum exhaust power requirement value determining module is used for determining the maximum exhaust power requirement value of the starting terminal machine according to the current working condition information;

the target operation frequency determining module is used for determining the target operation frequency of the main machine according to the maximum exhaust power requirement value;

and the control module is used for controlling the host to operate at the target operation frequency.

According to another aspect of the present invention, a central range hood system is provided, which comprises a common flue, a host located at an outlet of the common flue, and terminal machines located on each floor, wherein the terminal machines on each floor are connected with the common flue;

the central range hood system also comprises a control device of the central range hood system.

According to the technical scheme of the embodiment of the invention, the maximum exhaust power requirement value of the starting terminal is determined according to the gear of the starting terminal, the target exhaust air volume of the starting terminal under the gear and the number of the starting terminals under each gear, and the target operation frequency of the host is determined according to the maximum exhaust power requirement value, so that the host operates at a proper frequency, sufficient exhaust power is provided, the starting terminal with the maximum exhaust power requirement value can reach the target exhaust air volume, the starting terminals under different gears can reach the corresponding target exhaust air volume, and the exhaust air requirements of users on all floors under different cooking scenes are met.

It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present invention, nor do they necessarily limit the scope of the invention. Other features of the present invention will become apparent from the following description.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic flow chart of a control method of a central range hood system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a central extractor hood system according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a power performance curve of a terminal according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a power performance curve of a host according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a power performance curve of a host at a predetermined reference frequency according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a power performance curve of another host at a predetermined reference frequency according to an embodiment of the present invention;

FIG. 7 is a schematic diagram illustrating an opening-resistance characteristic relationship of a power distribution valve according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a control method of a central extractor hood system according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a control device of a central extractor hood system according to an embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, 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.

It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present invention and the above-described drawings, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Fig. 1 is a schematic flow chart of a control method of a central extractor hood system according to an embodiment of the present invention, which is applicable to the central extractor hood system in this embodiment. The control method of the central extractor hood system provided by the embodiment of the invention can be executed by a control device in the central extractor hood system, the control device can be realized in a hardware and/or software form, and for example, the control device can be configured in a controller of the central extractor hood system.

Specifically, fig. 2 is a schematic structural diagram of a central range hood system according to an embodiment of the present invention, and as shown in fig. 2, the central range hood system includes a common flue 10, a host 11 located at an outlet of the common flue 10, and terminals 12 located on each floor, and the terminals 12 on each floor may be connected to the common flue 10 through exhaust pipes thereof.

As shown in fig. 2, the terminal 12 is an exhaust device such as a range hood or an integrated kitchen with a built-in exhaust motor, and the terminal 12 can be installed in a kitchen of each floor.

With continued reference to FIG. 2, the common tunnel 10 extends through the entire height of the floors, and the floors of the same common tunnel 10 may be numbered from level 1F₁Begin numbering in sequence until the top floor F_NThen top building F_NIs connected to a common flue 10, floor F_N-1Connected to a common flue 10, … …, floor 1F₁The terminal 12 of each floor is connected with the common flue 10, so that the terminal 12 of each floor can perform centralized smoke exhaust through the common flue 10.

The common flue 10 may be a rectangular parallelepiped structure, but is not limited thereto.

With reference to fig. 2, a main unit 11 may be installed at an air outlet of the common flue 10 on the roof of the residence, and the main unit 11 includes a power fan device therein, which may play a role of assisting in discharging smoke of the oil smoke in the common flue 10.

Further, the main machine 11 may further include a fan frequency conversion control unit and a controller, where the fan frequency conversion control unit is used to adjust the frequency of the power fan device. Meanwhile, the control device of the central range hood system can be integrated in the controller of the main machine 11, and the terminal machines 12 and the main machine 11 on each floor can communicate in a wired or wireless mode.

With continuing reference to fig. 1, the method for controlling the central range hood system provided by the present invention comprises:

s110, obtaining current working condition information, wherein the working condition information comprises the gear of the starting terminal machine, the target air exhaust volume of the starting terminal machine under the gear and the number of the starting terminal machines under each gear.

The working condition information refers to the working state information of the central range hood system.

A powered-on terminal is a terminal 12 that is in an on state.

Specifically, the terminal 12 has a built-in air exhaust motor, and the terminal 12 can have three gears of low, middle and high, and the corresponding gears are respectively a gear X1 (low gear), a gear X2 (middle gear), and a gear X3 (high/quick stir-fry gear). It can be understood that the higher the gear of the terminal 12, the higher the frequency of the built-in exhaust motor, and the higher the wind pressure provided.

Further, the central extractor hood system presets the target air exhaust amount corresponding to the shift position according to the shift position of the terminal 12, and the target air exhaust amount of the terminal 12 under different shift positions is different, and the higher the shift position of the terminal 12 is, the larger the target air exhaust amount corresponding to the shift position is, for example, when the terminal 12 has three shift positions of X1 shift (low shift position), X2 shift position (middle shift position), and X3 shift position (high/quick stir-fry position), the three shift positions respectively correspond to the target air exhaust amount Q of the three terminals 12_Z1、Q_Z2And Q_Z3At this time, Q_Z1Is the target exhaust air volume, Q, corresponding to the X1 gear_Z2Is the target exhaust air volume, Q, corresponding to the X2 gear_Z3Is the target exhaust air volume corresponding to the X3 gear, and Q_Z1＜Q_Z2＜Q_Z3It can be understood that the larger the target air discharge amount is, the better the effect of absorbing the oil smoke is.

Wherein Q may be set_Z1Is 10 cubic meters per minute, Q_Z2Is 11 cubic meters per minute, Q_Z3Is 12 cubic meters per minute, but is not limited thereto, and can be set by those skilled in the art according to actual needs. For example, in order to secure the effect of absorbing the oil smoke, the minimum target air discharge amount may be set to be greater than or equal to 8.3 cubic meters per minute; meanwhile, in order to prevent the power consumption from being too large, the maximum target exhaust air volume may be set to be not more than 14 cubic meters per minute, which is not limited in the embodiment of the present invention.

It should be noted that the gear of each terminal 12 can be selected or input by the user on the control panel of the terminal 12 to obtain different target air discharge amounts, so as to meet different cooking ranges. For example, when the user is cooking, the amount of oil smoke is small, and the amount of exhaust air required is small, the terminal 12 is adjusted to a middle or low gear to meet the requirement of exhaust air, and the power consumption can be reduced; when a user is frying and cooking, the oil smoke amount is large, the required exhaust amount is large, and a high gear can be opened to meet the smoke exhaust requirement, so that different cooking scenes are matched with different target exhaust amounts, and the fresh and healthy cooking environment of a kitchen is kept.

In addition, the embodiment only takes the terminal 12 as an example to set 3 preset gears, but is not limited to this, and technical personnel in the field can set the number of the gears of the terminal 12 according to actual requirements, and under normal conditions, the terminal 12 can be set to have 3-4 gears, so that the gear setting of the terminal 12 is not too complex while different cooking scene requirements of users are met, and the daily use is simple and convenient.

Furthermore, each floor terminal machine 12 sends the on-off signal and the gear signal to the control device of the central range hood system in real time, and the control device can calculate the number of the on-off terminal machines under each gear according to the on-off signal and the gear of each terminal machine 12.

In addition, each terminal machine 12 can also send the target exhaust air volume of the started terminal machine in the current gear to the control device, but not limited to this, in other embodiments, the target exhaust air volume of the terminal machine 12 in each gear can be stored in the control device in advance, so as to reduce the communication data volume.

And S120, determining the maximum exhaust power requirement value of the starting terminal machine according to the current working condition information.

Specifically, for example, the terminal 12 has three gears of X1 (low), X2 (medium), and X3 (high/quick stir-fry), which may be according to the gear of the terminal, the target air exhaust volume of the terminal in the gear, the number m1 of the terminals in X1, the number m2 of the terminals in X2, and the number m2 of the terminals in X3M3, calculating the maximum exhaust power demand value MaxP of the start-up terminal of each floor when reaching the target exhaust air volume_ciWherein the maximum exhaust power requirement value MaxP_ciThe maximum air exhaust resistance is the maximum air exhaust resistance which needs to be overcome when the starting terminal machine of each floor reaches the target air exhaust volume.

It should be noted that, because the public flue 10 has the pressure distribution characteristics of large bottom back pressure and small top back pressure, the air exhaust resistance that the low-floor start-up terminal machine needs to overcome when reaching its target air exhaust volume is usually greater than the air exhaust resistance that the high-floor start-up terminal machine needs to overcome when reaching its target air exhaust volume, so the maximum air exhaust resistance that the start-up terminal machine located at the bottom floor needs to overcome when reaching its target air exhaust volume can be directly calculated as the maximum air exhaust power requirement value MaxP_ciThereby contributing to a reduction in the amount of calculation, but is not limited thereto.

It can be understood that, the more the number of the start-up terminal machines is, the higher the gear of the start-up terminal machine is, the larger the sum of the target air discharge quantities of the start-up terminal machines of each floor is, and the maximum air discharge power demand value MaxP of the start-up terminal machine of each floor when reaching the target air discharge quantity thereof_ciThe larger.

And S130, determining the target operation frequency of the main machine according to the maximum exhaust power requirement value.

Specifically, when the maximum exhaust power demand value MaxP_ciWhen the air discharge resistance is larger than 0, the air discharge resistance which needs to be overcome when at least one starting terminal reaches the target air discharge quantity is a positive value, at the moment, the power fan device of the host 11 is set to work to draw out the oil smoke in the public flue 10, so that the starting terminal is helped to overcome the air discharge resistance, the smoke discharge of each floor is assisted, and the starting terminal of each floor can reach the target air discharge quantity.

Wherein the target operating frequency of the power fan device in the main machine 11 can be set according to the maximum exhaust power demand value MaxP_ciDetermining the maximum exhaust power demand value MaxP_ciWhen smaller, the target operating frequency of the host 11 may be set smaller to reduce power consumption; when the maximum exhaust power demand value MaxP_ciWhen larger, can be setThe target operation frequency of the main unit 11 is relatively high, and sufficient exhaust power is provided, so that the starting terminal with the largest exhaust power requirement value can reach the target exhaust air volume.

It can be understood that, when the power provided by the host 11 can make the power terminal with the largest exhaust power requirement reach the target exhaust air volume, the other power terminals with the smaller exhaust power requirement can also reach the corresponding target exhaust air volume.

And S140, controlling the host to run at the target running frequency.

After the target operation frequency of the main unit 11 is determined, the power fan device of the main unit 11 is controlled to operate at the target operation frequency, so that the power fan device operates at a proper frequency, sufficient exhaust power can be provided, the starting terminal with the largest exhaust power requirement value can reach the target exhaust air quantity, and power consumption cannot be increased due to overlarge power.

In summary, in the control method of the central range hood system provided in the embodiment of the present invention, the maximum exhaust power requirement value of the start-up terminal is determined according to the gear of the start-up terminal, the target exhaust air volume of the start-up terminal in the gear of the start-up terminal, and the number of the start-up terminals in each gear, and the target operation frequency of the host is determined according to the maximum exhaust power requirement value, so that the host operates at a suitable frequency, thereby providing sufficient exhaust power, enabling the start-up terminal with the maximum exhaust power requirement value to reach the target exhaust air volume, further enabling the start-up terminals in different gears to reach the corresponding target exhaust air volume, and further satisfying the exhaust air requirements of users in different cooking scenes.

Optionally, determining the maximum exhaust power requirement value of the terminal machine according to the current working condition information includes:

and determining the air exhaust resistance value of each starting terminal when the target air exhaust volume of each starting terminal is reached according to the current working condition information.

And aiming at each starting terminal, determining the exhaust power requirement value of the starting terminal according to the exhaust resistance value of the starting terminal and the wind pressure value provided by the starting terminal under the gear position.

In which, taking the terminal 12 having three gears of X1 (low), X2 (middle) and X3 (high/quick stir), the number m of the terminal can be determined according to the number of the terminals in X1₁The number m of the starting terminal machines in the X2 grade₂The number m of the starting terminal machines in the X3 grade₃Target exhaust volume Q corresponding to X1 grade of starting terminal machine_Z1And the target exhaust volume Q corresponding to the X2 gear of the startup terminal machine_Z2And the target exhaust volume Q corresponding to the X3 gear of the startup terminal machine_Z3Calculating the air discharge resistance value delta P of each starting terminal when reaching the target air discharge quantity_i＝f(Q_z1，Q_z2，Q_z3，m₁，m₂，m₃) Wherein the exhaust resistance value is delta P_iWhich is the maximum air discharge resistance that must be overcome to achieve its target air discharge when the terminal 12 is not turned on.

It can be understood that, in fact, when the starting terminal machine is at the starting gear, the built-in exhaust motor works according to the gear, and the exhaust power corresponding to the gear is provided, so that the exhaust power requirement value is the exhaust resistance value delta P_iAnd the power provided by the built-in exhaust motor.

Specifically, taking the example that the terminal 12 has three gears of X1 (low gear), X2 (middle gear) and X3 (high/quick stir-fry gear), the power performance curve of the terminal 12 at X1 is f₁(P, Q), from which the target exhaust air quantity Q of the terminal 12 can be obtained_Z1Resistance P overcome_x1I.e. P_x1When the terminal 12 is in the X1 gear, the terminal is internally provided with air exhaust power provided by an air exhaust motor; similarly, the power performance curve of terminal 12 at the X2 gear is f₂(P, Q), from which the target exhaust air quantity Q of the terminal 12 can be obtained_Z2Resistance P overcome_x2I.e. P_x2When the terminal 12 is in the X2 gear, the terminal is internally provided with air exhaust power provided by an air exhaust motor; the power performance curve of terminal 12 at the X3 gear position is f₃(P, Q) obtained from this curveObtaining the target exhaust air quantity Q of the terminal 12_Z3Resistance P overcome_x3I.e. P_x3When the terminal 12 is in the X3 gear position, the exhaust motor is arranged in the terminal to provide the exhaust power.

Wherein the dynamic performance curve P_x＝f_x(Q) is a relationship curve of wind pressure and wind volume of the built-in exhaust motor of the terminal 12, and exemplarily, fig. 3 is a schematic diagram of a power performance curve of the terminal according to an embodiment of the present invention, as shown in fig. 3, an abscissa Q represents wind volume, an ordinate P represents wind pressure, and the power performance curve f of the terminal 12 corresponds to a low level X1₁(P, Q), terminal 12 corresponds to power performance curve f at X2 Low₂(P, Q), terminal 12 corresponds to power performance curve f at X3 Low level₃(P，Q)。

After the exhaust power provided by each starting terminal machine under the gear position is obtained, the exhaust power requirement value P of each starting terminal machine under the target exhaust air volume can be calculated_ci＝ΔP_i-P_xyWherein P is_xyIs P_x1、P_x2、P_x3One of them is determined by the gear of the terminal, for example, when the gear of the terminal is X1 gear, then P is_xyIs P_x1And so on.

Further, determining the exhaust power demand value P_ciExhaust power requirement value P corresponding to maximum starting terminal_ciMaxP for maximum exhaust power demand_ci。

Since the common flue 10 has the pressure distribution characteristics of large bottom back pressure and small top back pressure, in general, the air exhaust resistance to be overcome by the low-rise terminal set when reaching the target air exhaust volume is greater than the air exhaust resistance to be overcome by the high-rise terminal set when reaching the target air exhaust volume, and therefore, the air exhaust power requirement value P of the terminal set at the bottom floor is usually set as the lowest floor_ciMaxP for maximum exhaust power demand_ciIn practical situations, however, there may be disturbances of other factors that result in the exhaust power demand value P_ciThe largest floor is not the bottommost floor, and the embodiment calculates the floorExhaust power requirement value P of starting terminal machine when reaching target exhaust air volume_ciAnd determining the exhaust power demand value P_ciThe maximum value in the air exhaust power requirement value is the maximum value MaxP_ciThe accuracy of the calculation can be improved.

Optionally, the air exhaust resistance value delta P of each starting terminal machine_iAnd the floor position F of each starting terminal machine in the central range hood system_iThe total floor number N, the floor height h, the roughness k of the common flue 10, the specification a × b of the common flue 10, and the inner diameter D of the exhaust pipe of the terminal 12 are related, so that, in order to make the calculation more accurate, the embodiment can also calculate the exhaust resistance value Δ P of each floor terminal when the terminal reaches the target exhaust air volume according to the parameters_i＝f(Q_z1，Q_z2，Q_z3，a，b，D，N，k，m₁，m₂，m₃，F_iH), but is not limited thereto.

Optionally, determining the target operating frequency of the host according to the maximum exhaust power demand value includes:

and when the maximum exhaust power requirement value is larger than 0, determining the working point information of the host according to the maximum exhaust power requirement value and the current working condition information, wherein the working point information comprises the air volume value and the air pressure value of the host at the working point.

And determining the target operating frequency of the host according to the operating point information.

The operating point information of the host computer comprises an air volume value Q and an air pressure value P when the host computer is at the operating point, namely the operating point is expressed as (P)₀，Q₀)。

As described above, when the maximum exhaust power demand value MaxP_ciWhen the value is more than 0, the power fan device of the main machine 11 needs to be started, and at the moment, P is set₀＝MaxP_ci，Q₀＝1.15*(m₁*Q_Z1+m₂*Q_Z2+m₃*Q_Z3) Wherein 1.15 is a system common flue gas leakage rate coefficient, which is not limited to 1.15 and can be set by a person skilled in the art according to actual conditions.

Optionally, the power performance curve f of the power fan device of the main machine 11 at each operating frequency can be used_x(P，Q，R_x) Determining a target operating frequency R of the host machine 11_xAnd controls the power fan device of the main machine 11 at the frequency R_xThe operation, and thus the operation at the appropriate frequency, can provide sufficient exhaust power without causing excessive power to increase power consumption, but is not limited thereto.

Wherein, the dynamic performance curve f_x(P，Q，R_x) Referring to a relationship curve between the wind pressure and the wind volume of the power fan device of the host 11, fig. 4 is a schematic diagram of a power performance curve of the host according to an embodiment of the present invention, as shown in fig. 4, an abscissa Q represents the wind volume, an ordinate P represents the wind pressure, and the terminal is at different frequencies R_x(with R)₁、R₂And R₃For example) corresponding to different dynamic performance curves.

and determining the resistance coefficient of the host at the working point according to the working point information.

And determining the target operating frequency of the main machine according to the resistance coefficient and the preset reference frequency of the main machine.

As mentioned above, the power performance curve f of the power fan device of the main machine 11 at each operating frequency is used_x(P，Q，R_x) Determining a target operating frequency R of the host 11_xIf the central range hood system is required to pre-store the power performance curves f corresponding to a plurality of groups of operating frequencies_x(P，Q，R_x) And occupy more storage space.

However, the inventor found that under different working conditions, the resistance coefficient of the main machine 11 at the working point is constant, and the frequency of the main machine 11 (the rotational speed of the ac motor of the power fan device in the main machine 11) is in a ratio relation with the air exhaust amount of the main machine 11, so that in this embodiment, only one set of power performance curves of the power fan device of the main machine 11 at the preset reference frequency may be prestored, and the power performance curves are obtained according to the working point information (P)₀，Q₀) Determining the drag coefficient of a host at an operating pointP₀/Q₀ ²According to the coefficient of resistance P₀/Q₀ ²The system resistance characteristic curve that the host 11 needs to overcome under the current working condition can be obtained: p ═ P₀/Q₀ ²)*Q²And according to the system resistance characteristic curve P ═ P₀/Q₀ ²)*Q²Determining the resistance coefficient P corresponding to the main engine 11 under the preset reference frequency according to the power performance curve of the power fan equipment of the main engine 11 under the preset reference frequency₀/Q₀ ²And then, the target operating frequency of the host 11 is calculated according to the operating point information of the host 11 under the preset reference frequency. Wherein, because only need prestore the power performance curve of the power fan equipment of a set of host computer 11 under presetting the reference frequency, but greatly reduced storage space helps reduce cost.

For example, fig. 5 is a schematic diagram of a power performance curve of a host under a preset reference frequency according to an embodiment of the present invention, as shown in fig. 5, an abscissa Q represents an air volume, an ordinate P represents a wind pressure, taking the preset reference frequency as 50Hz as an example, and a power performance curve of the host 11 under the preset reference frequency of 50Hz is f₅₀(P, Q), the system resistance characteristic curve that the main engine 11 needs to overcome under the current working condition is P ═ P (P₀/Q₀ ²)*Q²Then, the intersection point of the two curves is calculated, and the corresponding resistance coefficient P of the host 11 at the preset reference frequency of 50Hz can be determined₀/Q₀ ²Working point (P)₅₀，Q₅₀) Further, the operating point (P) of the host 11 at the preset reference frequency of 50Hz can be determined₅₀，Q₅₀) The target operating frequency of the host 11 is estimated.

Optionally, the preset reference frequency includes a default reference frequency.

Determining the target operating frequency of the host according to the resistance coefficient and the preset reference frequency of the host, wherein the method comprises the following steps:

and determining a default reference air quantity value of the host at the default reference frequency according to the resistance coefficient.

And determining the target operating frequency of the host according to the air volume value of the host at the working point, the default reference frequency and the default reference air volume value.

The preset reference frequency may be one or multiple, and when the preset reference frequency is one, the preset reference frequency is the default reference frequency, and at this time, only the power performance curve of the power fan device of the group of hosts 11 under the default reference frequency is prestored. And when the preset reference frequency is a plurality of preset reference frequencies, the preset reference frequency which is preferentially calculated is the default reference frequency.

For example, fig. 6 is a schematic diagram of a power performance curve of another host machine according to an embodiment of the present invention at a preset reference frequency, as shown in fig. 6, the preset reference frequency may include 20Hz, 30Hz, and 50Hz, and the default reference frequency is 50Hz, for example, according to the operating point information (P)₀，Q₀) Determining the drag coefficient P of the host at the operating point₀/Q₀ ²Then, the system resistance characteristic curve P is preferentially equal to (P)₀/Q₀ ²)*Q²And the power performance curve f of the power fan device of the main machine 11 at the default reference frequency of 50Hz₅₀(P, Q) determining the resistance coefficient P corresponding to the default reference frequency 50Hz of the host 11₀/Q₀ ²Operating point information (P) of₅₀，Q₅₀) Wherein P is₅₀The resistance coefficient P is corresponding to the default reference frequency 50Hz for the host machine 11₀/Q₀ ²Default reference wind pressure value, Q₅₀The resistance coefficient P is corresponding to the default reference frequency of 50Hz for the host machine 11₀/Q₀ ²The default reference air volume value.

Further, as mentioned above, the frequency of the main machine 11 (the rotational speed of the ac motor of the power fan device in the main machine 11) is in a ratio relation with the air exhausting amount of the main machine 11, so that, in the present embodiment, the main machine 11 can correspond to the resistance coefficient P at the default reference frequency of 50Hz₀/Q₀ ²Operating point information (P) of₅₀，Q₅₀) Obtaining the corresponding resistance coefficient P of the host 11 at the default reference frequency of 50Hz₀/Q₀ ²Default reference air volume value Q₅₀The relationship between the rotating speed (frequency) of the alternating current motor and the air volume is as follows: r_x/50＝Q₀/Q₅₀Calculating the target operating frequency R of the host 11_xAnd controls the host 11 at a frequency R_xAnd (5) operating.

Optionally, the preset reference frequency further includes at least one backup reference frequency.

After determining the target operating frequency of the host according to the air volume value when the host is at the working point, the default reference frequency and the default reference air volume value, the method further comprises the following steps:

and when the target operating frequency is positioned outside the default effective frequency range corresponding to the default reference frequency, confirming the standby reference frequency according to the target operating frequency.

And determining the standby reference air exhausting quantity of the host at the standby reference frequency according to the resistance coefficient.

And determining the target operation frequency of the host according to the air volume value, the standby reference frequency and the standby reference air exhaust volume of the host at the working point.

Specifically, in practical applications, the inventors found that if the target operating frequency R of the main machine 11 is calculated from the power performance curve of the main machine 11 at the default reference frequency, the target operating frequency R is calculated_xWhen the difference value between the target operating frequency and the default reference frequency is larger, the calculated target operating frequency R is_xThere will be some error, resulting in excess or deficiency of the exhaust power provided by the main unit 11 under ideal conditions.

Therefore, in the present embodiment, the default reference frequency is preset with the corresponding default effective frequency range, and when the target operating frequency R of the host 11 is calculated from the power performance curve of the host 11 under the default reference frequency_xWhen the target operating frequency R of the host 11 is within the default effective frequency range, the target operating frequency R is calculated_xThe method is relatively accurate; and a target operating frequency R of the main machine 11 when calculated from a power performance curve of the main machine 11 at a default reference frequency_xWhen the target operating frequency R is out of the default effective frequency range, the calculated target operating frequency R of the host 11_xThere will be some error.

Wherein the default effective frequency range is determined by a default reference frequency, mayOptionally, the default effective frequency range is a continuous range of values including the default reference frequency, the upper limit of the default effective frequency range may be less than or equal to 150% of the default reference frequency, the lower limit of the default effective frequency range may be greater than or equal to 0, or greater than or equal to 50% of the default reference frequency. For example, taking the default reference frequency of 50Hz as an example, the default effective frequency range may be set to 40 Hz-50 Hz, i.e. when the target operation frequency R of the host machine 11 is calculated from the power performance curve of the host machine 11 at the default reference frequency_xLess than 40Hz, or, more than 50Hz, the target operating frequency R_xThere will be some error.

In this embodiment, the preset reference frequency further includes at least one backup reference frequency, the backup reference frequency is located outside the default effective frequency range, and with reference to fig. 5, taking the default reference frequency as 50Hz, as an example, the default effective frequency range may be set to 40Hz to 50Hz, and the backup reference frequency may include 20Hz and 30Hz, where, as with the default reference frequency, the backup reference frequency may be correspondingly set with a backup effective frequency range, for example, the backup effective frequency range of the backup reference frequency 20Hz is 0 to 20Hz, and the backup effective frequency range of the backup reference frequency 30Hz is 20Hz to 40 Hz.

Further, the target operating frequency R of the main machine 11 when calculated from the power performance curve of the main machine 11 at the default reference frequency_xDetermining a target operating frequency R when outside of the default effective frequency range_xThe standby effective frequency range, and thus the target operating frequency R_xThe backup effective frequency range in which to locate determines the backup reference frequency, e.g., when the target operating frequency R of the host machine 11 is calculated from the power performance curve of the host machine 11 at the default reference frequency_xAt 25Hz, it is in the standby effective frequency range of 20Hz to 40Hz, and the corresponding standby reference frequency is 30 Hz.

Further, after determining the backup reference frequency (30 Hz for example), the system resistance characteristic curve P is given (P ═ P)₀/Q₀ ²)*Q²And the dynamic performance curve f of the power fan device of the main machine 11 under the standby reference frequency of 30Hz₃₀(P, Q) determining the drag coefficient P of the host 11 at the alternate reference frequency of 30Hz₀/Q₀ ²Operating point information (P) of₃₀，Q₃₀) And the relation between the frequency and the air volume is as follows: r_x/30＝Q₀/Q₃₀Calculating the target operating frequency R of the host 11_xThereby more accurately calculating the target running frequency R_x。

The spare effective frequency range may be a continuous range of values including the spare reference frequency, the upper limit value of the spare effective frequency range may be less than or equal to 150% of the spare reference frequency, the lower limit value of the spare effective frequency range may be greater than or equal to 0, or greater than or equal to 50% of the spare reference frequency, but the spare effective frequency range is not limited thereto, and those skilled in the art may set the spare effective frequency range according to actual requirements.

It should be noted that, the default reference frequency and the backup reference frequency, and the corresponding default valid frequency range and the corresponding backup valid frequency range are not limited to the values provided in the above embodiments, in other embodiments, the default reference frequency may also be set to be 50Hz, the corresponding default valid frequency range is 40Hz to 50Hz, the backup reference frequencies include 20Hz, 30Hz, and 40Hz, the backup valid frequency range of the backup reference frequency 20Hz is 0 to 20Hz, the backup valid frequency range of the backup reference frequency 30Hz is 20Hz to 30Hz, and the backup valid frequency range of the backup reference frequency 40Hz is 30Hz to 40Hz, which can be set by a person skilled in the art according to actual requirements.

It should be noted that there should be no overlap between the alternate effective frequency ranges and the default effective frequency ranges, and the set of alternate effective frequency ranges and the default effective frequency ranges may constitute a continuous range of values, for example, the set of 0-20 Hz, 20 Hz-30 Hz, 30 Hz-40 Hz, and 40 Hz-50 Hz may constitute a continuous range of values.

and when the maximum exhaust power requirement value is less than or equal to 0, determining the target operation frequency of the main machine to be 0.

Specifically, when the maximum exhaust power demand value MaxP_ciWhen the air discharge quantity is less than or equal to 0, the starting terminal machine of each floor does not need extra air discharge power when reaching the corresponding target air discharge quantity, and at the moment, the target running frequency of the host 11 can be set to be 0, namely, the power fan equipment of the host 11 is not started, so that the power consumption is reduced.

With continued reference to fig. 2, optionally, the central extractor hood system further includes a power distribution valve 13 located at each floor, and the terminal 12 at each floor is connected to the common flue 10 through the power distribution valve 13.

and when the maximum exhaust power requirement value is less than or equal to 0, determining that the target opening of the power distribution valve corresponding to the starting terminal machine is 90 degrees.

And when the maximum exhaust power requirement value is greater than 0, determining the target resistance coefficient of the power distribution valve corresponding to each starting terminal according to the maximum exhaust power requirement value.

And determining the target opening degree of the power distribution valve according to the target resistance coefficient.

Specifically, as shown in fig. 2, a power distribution valve 13 may be installed at an interface between an outlet of an exhaust duct of the terminal 12 and an inlet of the common flue 10, and the power distribution valve 13 is a device for adjusting an exhaust amount of the terminal 12. The power distribution valve 13 can be composed of a valve plate angle control module and a communication module, the valve plate angle control module can realize the opening and closing of the valve plate by controlling the rotation of the motor, and can control the opening angle of the valve plate; the communication module can realize the wireless communication function.

Illustratively, as shown in FIG. 2, a top floor F_NTerminal 12 through the top floor F_NIs connected to the common flue 10, floor F_N-1Terminal 12 through floor F_N-1 Power distribution valve 13 connected to common flue 10, … …, floor 1F₁Terminal 12 through first floor F₁Power distribution valve of13 are connected to the common tunnel 10.

Meanwhile, the terminal 12 of each floor is in communication connection with the power distribution valve 13 corresponding to the terminal, so that the terminal 12 can send the power on/off signal and the gear signal to the power distribution valve 13 corresponding to the terminal in real time.

Optionally, the control device (not shown in the figure) of the central range hood system is respectively connected with the top floor F_N Power distribution valve 13, floor F_N-1 Power distribution valve 13, … …, floor 1F₁The power distribution valves 13 are in communication connection, so that a control device of the central range hood system can obtain the working condition information sent by the power distribution valves 13 of each floor.

Illustratively, as shown in FIG. 2, the power distribution valves 13 installed in the kitchens on each floor of the same common flue 10 may be numbered from floor 1F₁Begin numbering in sequence until the top floor F_N。

Meanwhile, the control device of the central range hood system can be networked with the power distribution valves 13 of all the floors, so that real-time communication between the control device and the power distribution valves 13 of all the floors is realized. The power distribution valve 13 of each floor detects the power on/off signal of the terminal 12 in real time, and when the power on signal of the terminal 12 is detected, the power distribution valve 13 broadcasts the power on signal and the corresponding gear signal to the networking system, so that the control device in the networking system obtains the power on signal and the gear signal, and the number of the power on terminals in each gear is calculated according to the power on signal and the gear signal sent by the power distribution valve 13 of each floor.

In addition, the power distribution valve 13 can also send the target exhaust air volume corresponding to the gear of the starting terminal machine to the control device.

Wherein, when the maximum exhaust power demand value MaxP_ciWhen the air discharge quantity is less than or equal to 0, the starting terminal machine of each floor does not need extra air discharge power when reaching the target air discharge quantity, and at the moment, the target opening degree of the power distribution valve 13 corresponding to the starting terminal machine is determined to be 90 degrees so as to completely open the power distribution valve 13, so that the power distribution valve 13 is prevented from providing a resistance coefficient to reduce the air discharge quantity, and the reduction of the power consumption is facilitated.

Further, when the maximum exhaust power demand value is MaxP_ciWhen the air exhaust capacity is more than 0, the air exhaust resistance required to be overcome when the starting terminal reaches the target air exhaust capacity is a positive value, and at the moment, the power provided by the host 11 can enable the air exhaust power required value MaxP_ciWhen the maximum terminal reaches its target air exhausting quantity, the other air exhausting power demand value P_ciThe actual exhaust volume of the smaller terminal will be larger than the target exhaust volume.

Therefore, in this embodiment, the maximum exhaust power demand value MaxP is used_ciAnd determining a target resistance coefficient of the power distribution valve 13 corresponding to each starting terminal, determining a target opening degree of the power distribution valve 13 according to the target resistance coefficient, and providing a certain resistance coefficient through the power distribution valve 13 of each floor to adjust resistance, so as to realize the air exhaust quantity adjustment of the starting terminals of each floor. Since the smaller the opening of the power distribution valve 13, the larger the coefficient of resistance that can be provided, the target opening of the power distribution valve 13 at each floor can be adjusted to be different, so that the required value P of the exhaust power at the target exhaust flow rate at each floor can be set to be larger_ciAre all close to the maximum exhaust power requirement value MaxP_ciTherefore, the air exhaust volume of the starting terminal machine of different floors approaches to the target air exhaust volume, and the air exhaust requirements of users of all floors under different cooking scenes are met.

Specifically, for each starting terminal, the exhaust power demand value P can be calculated_ciAnd maximum exhaust power demand value MaxP_ciDifference value MaxP between_ci-P_ciAs a difference in resistance Δ P_ixThen according to the difference value of the resistance delta P_ixCalculating the target exhaust air quantity Q of the power distribution valve 13 at the corresponding starting terminal_zx(Q_zxIs Q_Z1、Q_Z2And Q_Z3Item in) of the target resistance coefficient ξ) to be adjusted_ix＝ΔP_ix/(Q_zx*Q_zx) So as to obtain the target resistance coefficient xi of the starting-up terminal machine_ix。

Furthermore, the opening-resistance characteristics of the power distribution valve of each floor can be determinedRelation f (xi)_iTheta) calculating a target opening degree theta of the power distribution valve_iFor example, fig. 7 is a schematic diagram of an opening-resistance characteristic relationship of a power distribution valve according to an embodiment of the present invention, as shown in fig. 7, an abscissa θ represents an opening, an ordinate ξ represents a resistance coefficient, and the smaller the opening of the power distribution valve 13, the larger the resistance coefficient that can be provided, the maximum opening of the power distribution valve 13 may be 90 °, at which time, the resistance coefficient provided by the power distribution valve 13 is the smallest, and according to the opening-resistance characteristic relationship f (ξ)_iθ), can be represented by a drag coefficient ξ_ixThe opening degree corresponding to the power distribution valve 13 is found as the target opening degree theta_i。

Wherein, the opening degree-resistance characteristic relation f (xi)_iθ) can be obtained by laboratory measurements, but is not limited thereto.

Further, the target opening degree θ is executed by controlling the power distribution valve 13_iSo that the power distribution valve 13 of each floor provides an appropriate drag coefficient to make the exhaust power demand value P of each floor under the target exhaust air volume_ciAre all close to the maximum exhaust power requirement value MaxP_ciThe air exhaust volume of the starting terminal machine of different floors approaches to the target air exhaust volume, and the air exhaust requirements of users of all floors under different cooking scenes are met.

In order to more clearly describe the technical solutions provided by the embodiments of the present invention, the following is a detailed description of the control method of the central range hood system provided by the present invention in a feasible implementation manner, and explanations of the same or corresponding terms as those in the above embodiments are not repeated herein.

Fig. 8 is a schematic structural diagram of a control method of a central extractor hood system according to an embodiment of the present invention, and as shown in fig. 8, the control method of the central extractor hood system includes:

and S1, numbering the power distribution valves installed in kitchens of all floors of the same common flue, and numbering the power distribution valves from floor 1 to top floor N. Meanwhile, the host machine is networked with the power distribution valves of all floors, so that the terminal machine sends the startup and shutdown signals and the gear signals to the power distribution valves in real time.

And S2, acquiring a startup and shutdown signal and a gear change signal of the range hood in real time by the power distribution valves of each floor, and broadcasting the signals to the central range hood networking system by the power distribution valves after the startup and gear signals of the range hood are detected. Wherein, the central range hood system presets the target air output of three terminal machines according to the terminal machine gear: q_Z1、Q_Z2And Q_Z3And corresponds to X1 (low), X2 (middle) and X3 (high/quick frying) of terminal one by one, namely Q_Z1Target exhaust volume, Q, corresponding to X1 gear_Z2Target exhaust volume, Q, corresponding to X2 gear_Z3Corresponding to the target exhaust air quantity of X3 gear, and Q_Z1＜Q_Z2＜Q_Z3。

S3, counting the number m of terminals with X1 gears in the central range hood system₁Number m of X2 grade terminals₂Number m of X3 grade terminals₃And floor position F of each starting terminal machine in central range hood system_iThe total floor number N, the floor height h, the roughness k of the public flue, the specification a multiplied by b of the public flue, the inner diameter D of the exhaust pipe of the terminal, and the exhaust resistance value delta P of the starting terminal of each floor when the starting terminal reaches the target exhaust volume_i＝f(Q_z1，Q_z2，Q_z3，a，b，D，N，k，m₁，m₂，m₃，F_i，h)。

According to the power performance curve f of the terminal machine at the X1 gear₁(P, Q) obtaining the target exhaust volume Q of the terminal machine_Z1Resistance P overcome_x1(ii) a According to the power performance curve f of the terminal machine at the X2 gear₂(P, Q) obtaining the target exhaust volume Q of the terminal machine_Z2Resistance P overcome_x2(ii) a According to the power performance curve f of the terminal machine at the X3 gear₃(P, Q) obtaining the target exhaust volume Q of the terminal machine_Z3Resistance P overcome_x3(ii) a Calculating the exhaust power requirement value P of each starting terminal under the target exhaust air volume_ci＝ΔP_i-P_xy(wherein P is_xyIs P_x1、P_x2、P_x3Is specifically initiated by startingGear of terminal machine), and the required value P of exhaust power is obtained_ciThe maximum value in the air exhaust is taken as the maximum exhaust power demand value MaxP_ci。

S31, when MaxP_ciWhen the temperature is less than or equal to 0, the power fan equipment of the main machine is not started.

S32, MaxP_ciWhen the working pressure is higher than 0, the power fan equipment of the main machine needs to be started, and the power performance working point of the main machine under the current working condition is (P)₀，Q₀) Wherein, the wind pressure value P of the host computer at the working point₀＝MaxP_ciAir quantity value Q of the main engine at the working point₀＝1.15*(m₁*Q_Z1+m₂*Q_Z2+m₃*Q_Z3) (wherein, 1.15 is the air leakage rate coefficient of the system common flue).

S33, calculating the system resistance characteristic curve P (P) to be overcome by the host under the current working condition₀/Q₀ ²)*Q²Combining with the power performance curve f of the host at the default reference frequency of 50Hz₅₀(P, Q), calculating the intersection point of the two curves to further obtain the resistance coefficient P corresponding to the host 11 under the default reference frequency of 50Hz under the current working condition₀/Q₀ ²Default reference air volume value Q₅₀。

S34, according to the relation between the rotating speed (frequency) of the alternating current motor and the air volume: r_x/50＝Q₀/Q₅₀Calculating the target operating frequency R of the host 11_xAnd controls the host 11 at a frequency R_xAnd (5) operating.

Further, the power distribution valve of each starting floor adjusts the angle and adjusts the exhaust power requirement value of the starting terminal machine of each starting floor, wherein the angle control method of the power distribution valve comprises the following steps:

s41, MaxP_ciWhen the opening degree is less than or equal to 0, the target opening degree of the power distribution valves corresponding to all the starting terminal machines is 90 degrees.

S42, MaxP_ciWhen the air exhaust power requirement value is more than 0, calculating the air exhaust power requirement value P_ciAnd maximum exhaust power demand value MaxP_ciDifference value MaxP between_ci-P_ciAs a difference in resistance Δ P_ix。

S43, according to the resistance difference value delta P_ixCalculating the target exhaust air quantity Q of the power distribution valve at the corresponding starting terminal machine_zx(Q_zxIs Q_Z1、Q_Z2And Q_Z3Some of) the target resistance coefficient ξ that needs to be adjusted_ix＝ΔP_ix/(Q_zx*Q_zx)。

S44, opening degree-resistance characteristic relation f (xi) of power distribution valve measured by laboratory_iθ) calculating a target opening θ of the power distribution valve_iAnd controls the power distribution valve to perform the target opening degree theta_i。

The control method of the central range hood system provided by the embodiment of the invention combines the terminal machine performance and the host machine performance of different gears, and adjusts the target operation frequency of the host machine and the target opening of the power distribution valve of each starting floor according to the maximum exhaust power requirement value of each starting terminal machine under the current working condition, so that the starting terminal machines can realize the corresponding target exhaust air volume under different gears. The starting terminal machine has different target air exhaust volumes under different gears, and can meet air exhaust volume requirements under different cooking scenes.

Based on the same invention concept, the embodiment of the invention also provides a control device of the central range hood system, the control device is applied to the central range hood system, the central range hood system comprises a common flue, a host machine positioned at the outlet of the common flue and terminal machines positioned on all floors, and the terminal machines on all floors can be connected with the common flue through exhaust pipes of the terminal machines.

The control device may be implemented in hardware and/or software, and may be configured in a controller of a host, for example.

Fig. 9 is a schematic structural diagram of a control device of a central extractor hood system according to an embodiment of the present invention, and as shown in fig. 9, the control device 20 includes:

the working condition information obtaining module 30 is configured to obtain current working condition information, where the working condition information includes a gear of the start-up terminal, a target air discharge amount of the start-up terminal at the gear, and a number of the start-up terminals at each gear.

And a maximum exhaust power requirement value determining module 31, configured to determine the maximum exhaust power requirement value of the terminal machine according to the current working condition information.

And the target operation frequency determining module 32 is used for determining the target operation frequency of the main machine according to the maximum exhaust power requirement value.

And a control module 33, configured to control the host to operate at the target operating frequency.

The control device of the central range hood system provided by the embodiment of the invention obtains the current working condition information such as the gear of the starting terminal machine, the target air exhaust quantity of the starting terminal machine under the gear of the starting terminal machine, the number of the starting terminal machines under each gear and the like through the working condition information obtaining module 30, determines the maximum air exhaust power demand value of the starting terminal machine according to the current working condition information through the maximum air exhaust power demand value determining module 31, determines the target operating frequency of the host machine according to the maximum air exhaust power demand value through the target operating frequency determining module 32, controls the host machine to operate at the target operating frequency through the control module 33 so as to enable the host machine to operate at a proper frequency, thereby providing enough smoke exhaust power, enabling the starting terminal machine with the maximum air exhaust power demand value to achieve the target air exhaust quantity thereof, further enabling the starting terminal machines under different gears to achieve the corresponding target air exhaust quantities thereof, the air exhaust requirements of users on all floors under different cooking scenes are met.

Optionally, the maximum exhaust power requirement value determining module 31 includes:

and the air exhaust resistance value determining unit is used for determining the air exhaust resistance value of each starting terminal when the target air exhaust volume of each starting terminal is reached according to the current working condition information.

And the exhaust power requirement value determining unit is used for determining the exhaust power requirement value of the starting terminal machine according to the exhaust resistance value of the starting terminal machine and the wind pressure value provided by the starting terminal machine under the gear position of the starting terminal machine aiming at each starting terminal machine.

And the maximum exhaust power requirement calculation unit is used for determining the maximum exhaust power requirement as the maximum exhaust power requirement.

Optionally, the target operating frequency determining module 32 includes:

and the working point information determining unit is used for determining the working point information of the host according to the maximum exhaust power requirement value and the current working condition information when the maximum exhaust power requirement value is greater than 0, wherein the working point information comprises an air volume value and an air pressure value of the host at the working point.

And the target operating frequency calculation unit determines the target operating frequency of the host according to the operating point information.

Optionally, the target operating frequency calculating unit is specifically configured to determine a resistance coefficient of the host at the operating point according to the operating point information, and determine the target operating frequency of the host according to the resistance coefficient and a preset reference frequency of the host.

The target operating frequency calculation unit is specifically further used for determining a default reference air quantity value of the host at the default reference frequency according to the resistance coefficient, and determining the target operating frequency of the host according to the air quantity value of the host at the working point, the default reference frequency and the default reference air quantity value.

Optionally, the preset reference frequency further includes at least one backup reference frequency, where the backup reference frequency is located outside a default valid frequency range corresponding to the default reference frequency.

The target operating frequency determination module 32 is further configured to:

Optionally, the target operating frequency determining module 32 is further configured to:

Optionally, the central range hood system further includes a power distribution valve located on each floor, and the terminal machine on each floor is connected with the common flue through the power distribution valve.

The control device 20 further includes:

the power distribution valve control module is used for determining that the target opening degree of the power distribution valve corresponding to the starting terminal machine is 90 degrees when the maximum exhaust power requirement value is less than or equal to 0; when the maximum exhaust power requirement value is larger than 0, determining a target resistance coefficient of a power distribution valve corresponding to each starting terminal according to the maximum exhaust power requirement value, and determining a target opening degree of the power distribution valve according to the target resistance coefficient; and controls the power distribution valve to perform the target opening degree.

The control device of the central range hood system provided by the embodiment of the invention can execute the control method of the central range hood system provided by any embodiment of the invention, has corresponding functional modules and beneficial effects of the execution method, and the explanations of the structures and the terms which are the same as or corresponding to the embodiments are not repeated herein.

Based on the same invention concept, the embodiment of the invention also provides a central range hood system which comprises a common flue, a host machine positioned at an outlet of the common flue and terminal machines positioned on all floors, wherein the terminal machines on all the floors are connected with the common flue. The central range hood system further comprises a control device of the central range hood system provided by any one of the embodiments, and the control device is in communication connection with the terminal machines and the host computers on all floors respectively.

The central range hood system provided by the embodiment of the invention can execute the control method of the central range hood system provided by any embodiment of the invention, has corresponding functional modules and beneficial effects of the execution method, and the explanation of the same or corresponding structures and terms as the above embodiments is not repeated herein.

It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired result of the technical solution of the present invention can be achieved.

The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method of a central range hood system is characterized by being applied to the central range hood system, wherein the central range hood system comprises a common flue, a host computer positioned at an outlet of the common flue and terminal machines positioned on all floors, and the terminal machines on all the floors are connected with the common flue;

the control method comprises the following steps:

and controlling the host to operate at the target operation frequency.

2. The control method according to claim 1,

determining the maximum exhaust power requirement value of the starting terminal machine according to the current working condition information, comprising the following steps:

determining an air exhaust resistance value of each starting terminal when the target air exhaust volume of each starting terminal is reached according to the current working condition information;

3. The control method according to claim 1,

determining the target operation frequency of the main engine according to the maximum exhaust power demand value, comprising the following steps:

4. The control method according to claim 3,

determining a target operating frequency of the host according to the operating point information, including:

5. The control method according to claim 4,

the preset reference frequency comprises a default reference frequency;

6. The control method according to claim 5,

the preset reference frequency further comprises at least one standby reference frequency;

7. The control method according to claim 1,

8. The control method according to claim 1,

the central range hood system also comprises power distribution valves positioned on all floors, and the terminal machines on all floors are connected with the common flue through the power distribution valves;

9. A control device of a central range hood system is characterized in that the control device is applied to the central range hood system, the central range hood system comprises a common flue, a host machine positioned at an outlet of the common flue and terminal machines positioned on all floors, and the terminal machines on all the floors are connected with the common flue;

the control device includes:

10. A central range hood system is characterized by comprising a common flue, a host machine positioned at an outlet of the common flue and terminal machines positioned on all floors, wherein the terminal machines on all floors are connected with the common flue;

the central extractor hood system further comprises a control device of the central extractor hood system of claim 9.