CN114811686A - Central range hood system and control method and control device thereof - Google Patents

Central range hood system and control method and control device thereof Download PDF

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Publication number
CN114811686A
CN114811686A CN202210379664.8A CN202210379664A CN114811686A CN 114811686 A CN114811686 A CN 114811686A CN 202210379664 A CN202210379664 A CN 202210379664A CN 114811686 A CN114811686 A CN 114811686A
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exhaust
target
power distribution
distribution valve
value
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CN114811686B (en
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任富佳
李富强
李明
陈晓伟
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Hangzhou Robam Appliances Co Ltd
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Hangzhou Robam Appliances Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2021—Arrangement or mounting of control or safety systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)

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 working condition information of gears of the starting terminal machine, target air exhaust volume of the starting terminal machine under the gears, the number of the starting terminal machines under each gear and the like; determining the maximum exhaust power requirement value of the starting terminal according to the current working condition information; determining the target opening degree of a power distribution valve corresponding to each starting terminal according to the maximum exhaust power requirement value; and the target opening of the power distribution valve is adjusted through the air pressure value of the exhaust pipe acquired by the air pressure sensor. The invention provides a central range hood system, a control method and a control device thereof, which adjust the target opening of a power distribution valve through the wind pressure value in an exhaust pipe fed back by a wind pressure sensor so as to adjust the actual exhaust volume of the exhaust pipe to reach the target exhaust volume of a starting terminal machine connected with the exhaust pipe, thereby meeting the exhaust requirements of users on various floors under 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 same air discharge quantity for each floor in the prior art can cause the problems 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 used for the central range hood system, the central range hood system comprises a common flue, and a power distribution valve, a terminal, an exhaust pipe and a wind pressure sensor which are positioned on each floor, the terminal on each floor is connected with the common flue through the exhaust pipe, and the power distribution valve and the wind pressure sensor are arranged in the exhaust pipe;
the control method comprises the following steps:
s1, 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;
s2, determining the maximum exhaust power requirement value of the starting terminal machine according to the current working condition information;
s3, determining the target opening degree of the power distribution valve corresponding to each starting terminal according to the maximum exhaust power requirement value;
s4, controlling the power distribution valve to execute the target opening degree;
s5, acquiring a wind pressure value of the exhaust duct through the wind pressure sensor;
and S6, adjusting the target opening of the power distribution valve according to the wind pressure value of the exhaust duct.
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, adjusting the target opening of the power distribution valve according to the wind pressure value of the exhaust duct includes:
and when the wind pressure value of the exhaust duct is larger than the exhaust resistance value of the starting terminal machine when the starting terminal machine reaches the target exhaust amount, increasing the target opening of the power distribution valve, and repeating S4-S6.
Alternatively, increasing the target opening degree of the power distribution valve includes:
and increasing the target opening degree of the power distribution valve by a preset opening degree value, wherein the preset opening degree value is theta, and theta is more than or equal to 0.5 degrees and less than or equal to 1.5 degrees.
Optionally, the adjusting the target opening of the power distribution valve according to the wind pressure value of the exhaust duct further includes:
when the wind pressure value of the exhaust duct is smaller than or equal to the exhaust resistance value of the starting terminal machine when the starting terminal machine reaches the target exhaust volume, the target opening of the power distribution valve is unchanged.
Optionally, the central extractor hood system further includes a host, and the host is located in the common flue;
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:
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.
According to another aspect of the present invention, there is provided a control device of a central range hood system, which is applied to the central range hood system, the central range hood system includes a common flue, and a power distribution valve, a terminal, an exhaust duct and a wind pressure sensor which are located on each floor, the terminal on each floor is connected with the common flue through the exhaust duct, and the power distribution valve and the wind pressure sensor are arranged in the exhaust duct;
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 opening determining module is used for determining the target opening of the power distribution valve corresponding to each starting terminal machine according to the maximum exhaust power requirement value;
the target opening control module is used for controlling the power distribution valve to execute the target opening;
the air pressure value acquisition module is used for acquiring the air pressure value of the exhaust pipe through the air pressure sensor;
and the target opening adjusting module is used for adjusting the target opening of the power distribution valve according to the air pressure value of the exhaust pipe.
According to another aspect of the present invention, a central range hood system is provided, which comprises a common flue, and a power distribution valve, a terminal, an exhaust duct and a wind pressure sensor which are located at each floor, wherein the terminal at each floor is connected with the common flue through the exhaust duct, and the power distribution valve and the wind pressure sensor are arranged in the exhaust duct;
the central range hood system also comprises a control device of the central range hood system.
Optionally, the wind pressure sensor is in communication connection with the control device of the central extractor hood system through the power distribution valve.
Optionally, the exhaust pipe includes the craspedodrome section pipeline, wind pressure sensor set up in the craspedodrome section pipeline.
The central range hood system, the control method and the control device thereof provided by the embodiment of the invention determine the maximum exhaust power demand value of the starting terminal machine according to the gear of the starting terminal machine, the target exhaust air volume of the starting terminal machine under the gear and the number of the starting terminal machines under each gear, and determine the target opening of the power distribution valve corresponding to each starting terminal machine according to the maximum exhaust power demand value, so that the power distribution valve of each floor provides a proper resistance coefficient, the exhaust power demand values of each floor under the target exhaust air volume are close to the maximum exhaust power demand value, the exhaust air volume of the starting terminal machines of different floors approaches to the target exhaust air volume, and the exhaust air demand of users of each floor under different cooking scenes is met. Meanwhile, the target opening of the power distribution valve is adjusted through the wind pressure value in the exhaust pipe fed back by the wind pressure sensor to adjust the actual exhaust volume of the exhaust pipe to reach the target exhaust volume of the starting terminal machine connected with the exhaust pipe, so that the requirements of exhaust smoke under different cooking scenes are met more accurately, and the freshness and health of the cooking environment of a kitchen are kept.
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 needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these 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, and a power distribution valve 11, a terminal 12, an exhaust duct 13, and an air pressure sensor 14 located on each floor, the terminal 12 on each floor is connected to the common flue 10 through the exhaust duct 13, and the power distribution valve 11 and the air pressure sensor 14 are disposed in the exhaust duct 13.
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 1F 1 Begin numbering in sequence until the top floor F N Then top floor F N The terminal 12 is connected with a common flue 10 through an exhaust pipe 13, and a floor F N-1 Terminal 12 is connected to common flue 10 through exhaust duct 13, … …, floor 1F 1 The terminal 12 is connected with the common flue 10 through an exhaust duct 13, so that the terminal 12 of each floor performs centralized smoke exhaust through the common flue 10.
The common flue 10 may be a rectangular parallelepiped structure, but is not limited thereto.
With continued reference to fig. 2, power distribution valve 11 may be installed at an interface between an outlet of exhaust duct 13 corresponding to terminal 12 and an inlet of common flue 10, and power distribution valve 11 is a device for adjusting an exhaust amount of terminal 12. The power distribution valve 11 can be composed of a valve plate angle control module and a communication module, the valve plate angle control module can control the rotation of a motor to open and close the valve plate and can control the opening angle of the valve plate; the communication module can realize the wireless communication function.
Optionally, the central range hood system further includes a control device (not shown in the figure), and the control device is respectively connected to the top floor F N Power distribution valve 11, floor F N-1 Power distribution valve 11, … …, floor 1F 1 Is communicatively connected to the power distribution valve 11.
Meanwhile, the terminal 12 of each floor is in communication connection with the power distribution valve 11 of the same floor.
With continuing reference to fig. 1, the method for controlling the central range hood system provided by the present invention comprises:
and S1, acquiring 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, namely, a low gear, a medium gear and a high gear, wherein the corresponding gears are respectively an X1 gear (low gear), an X2 gear (medium gear) and an X3 gear (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 Z2 And Q Z3 At this time, Q Z1 Is the target exhaust air volume, Q, corresponding to the X1 gear Z2 Is the target exhaust air volume, Q, corresponding to the X2 gear Z3 Is the target exhaust air volume corresponding to the X3 gear, and Q Z1 ＜Q Z2 ＜Q Z3 It 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 Z1 Is 10 cubic meters per minute, Q Z2 Is 11 cubic meters per minute, Q Z3 Is 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 air exhaust 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 required exhaust amount is small, the terminal 12 is adjusted to the middle and low gear to meet the requirement of exhaust smoke, 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, above-mentioned embodiment only sets up and predetermines 3 gears with terminating machine 12 as an example, but is not limited to this, and technical personnel in the field can set up the gear quantity of terminating machine 12 according to actual demand, and under the general condition, can set up terminating machine 12 and have 3 ~ 4 gears, when satisfying the different culinary art scene demands of user, can not make the gear setting of terminating machine 12 too complicated, and daily use is simple convenient.
Further, the power distribution valves 11 installed in the kitchens of the same common flue 10 may be numbered from floor 1F 1 Begin numbering in sequence until the top floor F N . Meanwhile, the terminal 12 of each floor is in communication connection with the power distribution valve 11 corresponding thereto, so that the terminal 12 can send the on-off signal and the gear signal to the power distribution valve 11 corresponding thereto in real time. The control device of the central range hood system is networked with the power distribution valves 11 of all the floors, so that real-time communication between the control device and the power distribution valves 11 of all the floors is realized, and the startup and shutdown signals and the gear signals of all the terminal machines 12 are obtained.
Specifically, the power distribution valves 11 of each floor detect the power on/off signals of the terminals 12 in real time, and when the power on signals of the terminals 12 are detected, the power distribution valves 11 broadcast the power on signals and the corresponding gear signals to the networking system, so that the control device in the networking system obtains the power on signals and the gear signals, and further calculates the number of the power on terminals in each gear according to the power on signals and the gear signals sent by the power distribution valves 11 of each floor.
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 through the power distribution valve 11, but the invention is not limited to this, and 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, thereby reducing the communication data volume.
And S2, determining the maximum exhaust power requirement value of the starting terminal machine according to the current working condition information.
Specifically, taking the terminal 12 with three gears of X1 (low), X2 (medium) and X3 (high/quick stir-fry), the maximum exhaust power requirement MaxP of the terminal on each floor when reaching the target exhaust air volume can be calculated according to the gear of the terminal, the target exhaust air volume of the terminal under the gear, the number m1 of the terminal at X1, the number m2 of the terminal at X2 and the number m3 of the terminal at X3 ci Wherein the maximum exhaust power requirement value MaxP ci The 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 ci Thereby 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 ci The larger.
And S3, determining the target opening degree of the power distribution valve corresponding to each starting terminal according to the maximum exhaust power requirement value.
Wherein, the starting terminal machine of different floors and starting different gearsThe starting terminal machines have different exhaust power requirement values, for example, under the same gear, the exhaust power requirement value of the starting terminal machine at a high floor is smaller than that of the starting terminal machine at a low floor, so that the maximum exhaust power requirement value MaxP when the starting terminal machine reaches the target exhaust air volume is met ci In time, there may be a situation where the actual exhaust air volume reached by the terminal machine being started up is greater than its target exhaust air volume.
In this embodiment, MaxP is determined according to the maximum exhaust power demand value ci And determining a target resistance coefficient of the power distribution valve 11 corresponding to each starting-up terminal, determining a target opening degree of the power distribution valve 11 according to the target resistance coefficient, and providing a certain resistance coefficient through the power distribution valve 11 of each floor to adjust the resistance, so as to adjust the air exhaust volume of each floor starting-up terminal. The smaller the opening of the power distribution valve 11, the larger the resistance coefficient can be provided, so by adjusting the target opening of the power distribution valve 11 at different floors, the exhaust power requirement value of each floor under the target exhaust air volume can approach the maximum exhaust power requirement value MaxP ci Therefore, the air exhaust volume of the starting terminal machine on different floors approaches to the target air exhaust volume, and the air exhaust requirements of users on different floors under different cooking scenes are met.
The opening degree refers to an opening angle of the power distribution valve.
And S4, controlling the power distribution valve to execute the target opening degree.
Wherein the target opening degree theta is performed by controlling the power distribution valve 11 i So that the power distribution valves 11 of each floor provide proper drag coefficients to make the exhaust power demand values of each floor under the target exhaust air volume approach to the maximum exhaust power demand value MaxP ci 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.
And S5, acquiring the wind pressure value of the exhaust duct through a wind pressure sensor.
A wind pressure sensor 14 is arranged in the exhaust duct 13 corresponding to each terminal 12, and the wind pressure sensor 14 is used for detecting a wind pressure value in the exhaust duct 13.
Specifically, the wind pressure sensor 14 may be in communication connection with a control device of the central extractor hood system, and the control device may obtain an actual wind pressure value in the exhaust duct 13 through the wind pressure sensor 14.
Wherein, the specific setting position of the wind pressure sensor 14 can be set according to the actual requirement as long as the wind pressure value in the exhaust pipe 13 can be detected. Meanwhile, the wind pressure sensor 14 may be any type of pressure sensor, and those skilled in the art may set the sensor according to actual needs.
And S6, adjusting the target opening of the power distribution valve according to the wind pressure value of the exhaust pipe.
The air pressure value in the exhaust duct 13 is related to the actual exhaust volume of the exhaust duct 13, and the actual exhaust volume of the exhaust duct 13 is the actual exhaust volume of the start-up terminal connected to the exhaust duct 13 because the start-up terminal exhausts air through the exhaust duct 13.
In this embodiment, the target opening of the power distribution valve 11 is adjusted according to the wind pressure value in the exhaust duct 13 fed back by the wind pressure sensor 14, so as to adjust the actual exhaust volume of the exhaust duct 13 to reach the target exhaust volume of the startup terminal connected to the exhaust duct 13, thereby satisfying the exhaust smoke requirements in different cooking scenes and keeping the kitchen cooking environment fresh and healthy.
In summary, the control method of the central range hood system provided in the embodiments of the present invention determines the maximum exhaust power requirement value of the start-up terminal according to the gear of the start-up terminal, the target exhaust air volume of the start-up terminal under the gear, and the number of the start-up terminals under each gear, and determines the target opening of the power distribution valve corresponding to each start-up terminal according to the maximum exhaust power requirement value, so that the power distribution valves of each floor provide appropriate resistance coefficients, so that the exhaust power requirement values of each floor under the target exhaust air volume are close to the maximum exhaust power requirement value, thereby achieving that the exhaust air volumes of the start-up terminals of different floors approach to the target exhaust air volumes, and satisfying the exhaust air requirements of users of each floor under different cooking scenes. Meanwhile, the target opening of the power distribution valve is adjusted through the wind pressure value in the exhaust pipe fed back by the wind pressure sensor, so that the actual exhaust volume of the exhaust pipe is adjusted to reach the target exhaust volume of the starting terminal machine connected with the exhaust pipe, the smoke exhaust requirements under different cooking scenes are met more accurately, and the freshness and health of the cooking environment of a kitchen are kept.
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.
And determining the maximum exhaust power requirement as the maximum exhaust power requirement.
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 X1 1 The number m of the starting terminal machines in the X2 grade 2 The number m of the starting terminal machines in the X3 grade 3 Target exhaust volume Q corresponding to X1 grade of starting terminal machine Z1 Target exhaust volume Q corresponding to X2 grade of starting terminal machine Z2 And the target exhaust volume Q corresponding to the X3 gear of the startup terminal machine Z3 Calculating 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 ，m 1 ，m 2 ，m 3 ) Wherein the exhaust resistance value is delta P i Which 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 terminal is turned on, the built-in exhaust motor works according to the gear to provide the exhaust power corresponding to the gear, and therefore, the exhaust power requirement value is the exhaust resistance value delta P i With provision for built-in exhaust motorsThe difference between the powers.
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 f 1 (P, Q), from which the target exhaust air quantity Q of the terminal 12 can be obtained Z1 Resistance P overcome x1 I.e. P x1 When 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 X2 gear is f 2 (P, Q), from which the target exhaust air quantity Q of the terminal 12 can be obtained Z2 Resistance P overcome x2 I.e. P x2 When 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 X3 gear is f 3 (P, Q), obtaining the target exhaust quantity Q of the terminal 12 from the curve Z3 Resistance P overcome x3 I.e. P x3 When the terminal 12 is in the X3 gear, the exhaust power provided by the exhaust motor is arranged in the terminal.
Wherein the dynamic performance curve P x ＝f x (Q) is a relation curve of wind pressure and wind volume of the built-in exhaust motor of the terminal 12, 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 the wind volume, an ordinate P represents the wind pressure, and the terminal 12 corresponds to the power performance curve f at a low level of X1 1 (P, Q), terminal 12 corresponds to power performance curve f at X2 Low level 2 (P, Q), terminal 12 corresponds to power performance curve f at X3 Low 3 (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 xy Wherein P is xy Is P x1 、P x2 、P x3 One of them is determined by the gear of the terminal, for example, when the gear of the terminal is X1 gear, then P is xy Is P x1 And so on.
Further, doFixed exhaust power demand value P ci Exhaust power requirement value P corresponding to maximum starting terminal ci MaxP 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 ci MaxP for maximum exhaust power demand ci In practical situations, however, there may be disturbances of other factors that result in the exhaust power demand value P ci The largest floor is not the bottom floor, and the exhaust power requirement value P of the starting terminal machine of each floor when the target exhaust air volume is reached is calculated ci And determining the exhaust power demand value P ci The maximum value in the air exhaust power requirement value is the maximum value MaxP ci The accuracy of the calculation can be improved.
Optionally, the air exhaust resistance value delta P of each starting terminal machine i And the floor position F of each starting terminal machine in the central range hood system i The 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，m 1 ，m 2 ，m 3 ，F i H), but is not limited thereto.
Optionally, the adjusting of the target opening of the power distribution valve according to the wind pressure value of the exhaust duct includes:
and when the wind pressure value of the exhaust duct is larger than the exhaust resistance value of the starting terminal when the starting terminal reaches the target exhaust amount, increasing the target opening of the power distribution valve, and repeating the steps from S4 to S6.
Wherein, inThe control device of the central range hood system can obtain the wind pressure value P in the exhaust pipe 13 corresponding to the starting terminal machine in real time through the wind pressure sensor si And apply the wind pressure value P si Comparing the wind pressure value with the wind pressure value corresponding to the target air discharge quantity of the starting terminal machine at the current gear, wherein the wind pressure value corresponding to the target air discharge quantity of the starting terminal machine at the current gear is equal to the air discharge resistance value P of the starting terminal machine when the target air discharge quantity of the starting terminal machine at the current gear is reached xy 。
Further, the larger the wind pressure value in the exhaust duct 13 is, the smaller the actual exhaust amount is, and in this embodiment, when P is si ＞P xy At this time, the target opening degree of the power distribution valve 11 is increased to increase the actual air discharge quantity of the start-up terminal, then the power distribution valve 11 is controlled to execute the increased target opening degree, the wind pressure sensor 14 is continuously used to obtain the wind pressure value of the exhaust pipe 13, and the wind pressure value P in the exhaust pipe 13 is renewed si And the air exhaust resistance value P of the starting terminal machine when the starting terminal machine reaches the target air exhaust volume under the current gear xy Comparing, and judging whether the actual air exhaust volume of the starting terminal machine reaches the target air exhaust volume of the starting terminal machine at the current gear, if P si ＞P xy If the actual air discharge volume of the power distribution valve 11 is still less than the target air discharge volume of the power terminal in the current gear, the target opening of the power distribution valve 11 is increased, i.e., the above steps S4-S6 are repeated until P is reached si ≤P xy At the moment, the actual air exhaust volume of the starting terminal machine reaches the target air exhaust volume of the starting terminal machine at the current gear, so that the smoke exhaust requirements under different cooking scenes are met.
Alternatively, increasing the target opening degree of the power distribution valve 11 includes:
and increasing the target opening degree of the power distribution valve 11 by a preset opening degree value, wherein the preset opening degree value is theta, and theta is more than or equal to 0.5 degrees and less than or equal to 1.5 degrees.
The preset opening value is an added value or a reduced value of the target opening of the power distribution valve 11 in a single adjustment, for example, when the target opening of the power distribution valve 11 is increased, the target opening can be increased by 0.5-1.5 degrees on the basis of the current target opening, and by setting a proper preset opening value, the situation that the target opening of the power distribution valve 11 is adjusted too much due to an overlarge preset opening value is avoided, so that the actual air exhaust volume of the terminal greatly exceeds the target air exhaust volume of the terminal in the starting state after the single adjustment; meanwhile, the reduction of the adjustment efficiency caused by the excessive adjustment times of the target opening of the power distribution valve 11 due to the excessively small preset opening value can be avoided.
It should be noted that the preset opening value is not limited to the above range of values, and those skilled in the art can set the specific value of the preset opening value according to actual requirements, for example, the preset opening value is set to be 1 °, which is not limited in the embodiment of the present invention.
Optionally, the method for adjusting the target opening of the power distribution valve 11 according to the wind pressure value of the exhaust duct 13 further includes:
when the wind pressure value P of the exhaust pipe 13 si Less than or equal to the exhaust resistance value P of the starting-up terminal when reaching the target exhaust volume xy At this time, the target opening degree of the power distribution valve 11 is not changed.
Wherein when P is si ≤P xy At this time, the target opening degree of the power distribution valve 11 may not be corrected to improve the adjustment efficiency of the target opening degree of the power distribution valve 11, but is not limited thereto.
In other embodiments, when P si ＜P xy At this time, the target opening degree of the power distribution valve 11 may also be reduced to make the actual air discharge amount of the start-up terminal approach to the target air discharge amount of the start-up terminal at the current gear. It is to be noted, however, that since the target opening degree of the power distribution valve 11 is increased or decreased by a preset opening degree value each time, the adjustment of the target opening degree of the power distribution valve 11 may not satisfy P si ＝P xy Resulting in the purpose of the power distribution valve 11The target opening degree is repeatedly adjusted around a threshold value all the time.
With continued reference to fig. 2, optionally, the central extractor hood system further comprises a host 15, the host 15 being located in the common flue 10.
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:
and determining the target operation frequency of the main machine according to the maximum exhaust power requirement value.
And the control host runs at the target running frequency.
As shown in fig. 2, a main unit 15 can be installed at an air outlet of the common flue 10 on the roof of the house, and the main unit 15 contains a power fan device, which can perform an auxiliary smoke exhaust function on the oil smoke in the common flue 10.
Further, the main machine 15 may further include a fan frequency conversion control unit and a controller, wherein the fan frequency conversion control unit is used for adjusting 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 host computer 15, and the host computer 15 and the power distribution valves 11 of all floors can be networked, so that the real-time communication between the host computer 15 and the power distribution valves 11 of all floors is realized.
Exemplary, maximum exhaust power demand value MaxP ci When the air discharge capacity of the starting terminal machine is larger than 0, the air discharge resistance which needs to be overcome when at least one starting terminal machine reaches the target air discharge capacity is a positive value, at the moment, the power fan device of the host machine 15 is set to work to draw out the oil smoke in the public flue 10, so that the starting terminal machine is helped to overcome the air discharge resistance of the starting terminal machine and assist each floor in discharging the smoke, and the starting terminal machine of each floor can reach the target air discharge capacity of the starting terminal machine.
Wherein the target operating frequency of the power fan device in the main machine 15 can be set according to the maximum exhaust power demand value MaxP ci Determining the maximum exhaust power demand value MaxP ci When smaller, the target operating frequency of the host 15 may be set smaller to reduce power consumption; when the maximum exhaust power demand value MaxP ci When the target operation frequency of the main machine 15 is higher, the target operation frequency can be set to be higher, and sufficient exhaust power is provided, so that the startup end with the maximum exhaust power requirement value is realizedThe end machine can reach the target air exhaust amount.
It can be understood that, when the power provided by the main machine 15 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.
Further, after the target operation frequency of the main unit 15 is determined, the power fan device of the main unit 15 is controlled to operate at the target operation frequency, so as to operate at a suitable frequency, and not only can enough exhaust power be provided, so that the start-up terminal with the largest exhaust power requirement value can reach the target exhaust air quantity, but also power is not excessively increased to increase power consumption.
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 ，Q 0 )。
As described above, when the maximum exhaust power demand value MaxP ci When the value is larger than 0, the power fan device of the main machine 15 needs to be started, and at the moment, P is set 0 ＝MaxP ci ，Q 0 ＝1.15*(m 1 *Q Z1 +m 2 *Q Z2 +m 3 *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 15 at each operating frequency can be used x (P，Q，R x ) Determining a target operating frequency R of the host 15 x And controls the power fan device of the main machine 15At a frequency R x The 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 computer 15, for example, fig. 4 is a schematic diagram of a power performance curve of the host computer provided by the 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 、R 2 And R 3 For example) corresponding to different dynamic performance curves.
Optionally, determining the target operating frequency of the host according to the operating point information includes:
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.
Wherein, as mentioned above, the power performance curve f of the power fan device of the main machine 15 at each operating frequency is used as the basis x (P，Q，R x ) Determining a target operating frequency R of the host 15 x If 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 more storage space is occupied.
However, the inventor found that under different working conditions, the resistance coefficient of the main unit 151 at the working point is constant, and the frequency of the main unit 15 (the rotation speed of the ac motor of the power fan device in the main unit 15) is in a ratio relation with the air exhaust amount of the main unit 15, so that in this embodiment, only one set of power performance curves of the power fan device of the main unit 15 at the preset reference frequency may be prestored according to the working point information (P) and the power performance curves of the power fan device of the main unit 15 at the preset reference frequency 0 ，Q 0 ) Determining the drag coefficient P of the host at the operating point 0 /Q 0 2 According to the coefficient of resistance P 0 /Q 0 2 The system resistance characteristic curve that the host 15 needs to overcome under the current working condition can be obtained: p ═ P 0 /Q 0 2 )*Q 2 And according to the system resistance characteristic curve P ═ P 0 /Q 0 2 )*Q 2 Determining the resistance coefficient P corresponding to the main engine 15 under the preset reference frequency according to the power performance curve of the power fan equipment of the main engine 15 under the preset reference frequency 0 /Q 0 2 And further, the target operating frequency of the host 15 is calculated according to the operating point information of the host 15 at the preset reference frequency. Wherein, because only need prestore the power performance curve of the power fan equipment of a set of host computer 15 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 15 under the preset reference frequency of 50Hz is f 50 (P, Q), the system resistance characteristic curve that the main engine 15 needs to overcome under the current operating condition is P ═ P (P 0 /Q 0 2 )*Q 2 Then, the intersection point of the two curves is calculated, and the corresponding resistance coefficient P of the host 15 under the preset reference frequency of 50Hz can be determined 0 /Q 0 2 Working point (P) 50 ，Q 50 ) Further, the operating point (P) of the host 15 at the preset reference frequency of 50Hz can be determined 50 ，Q 50 ) The target operating frequency of the host computer 15 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 15 under the default reference frequency is prestored. When there are a plurality of preset reference frequencies, the preset reference frequency that 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 ，Q 0 ) Determining the drag coefficient P of the host at the operating point 0 /Q 0 2 Then, the system resistance characteristic curve P is preferentially equal to (P) 0 /Q 0 2 )*Q 2 And the power performance curve f of the power fan device of the main machine 15 at the default reference frequency of 50Hz 50 (P, Q) determining the resistance coefficient P corresponding to the default reference frequency of 50Hz of the host 15 0 /Q 0 2 Operating point information (P) of 50 ，Q 50 ) Wherein, P 50 The resistance coefficient P is corresponding to the default reference frequency of 50Hz for the host computer 15 0 /Q 0 2 Default reference wind pressure value, Q 50 The resistance coefficient P is corresponding to the default reference frequency of 50Hz for the host computer 15 0 /Q 0 2 The default reference air volume value.
Further, as mentioned above, the frequency of the main machine 15 (the rotational speed of the ac motor of the power fan device in the main machine 15) is in a ratio relation with the air exhausting amount of the main machine 15, so that, in the present embodiment, the main machine 15 can correspond to the resistance coefficient P at the default reference frequency of 50Hz 0 /Q 0 2 Operating point information (P) of 50 ，Q 50 ) Obtaining the corresponding resistance coefficient P of the host 15 at the default reference frequency of 50Hz 0 /Q 0 2 Default reference air volume value Q 50 The relationship between the rotating speed (frequency) of the alternating current motor and the air volume is as follows: r x /50＝Q 0 /Q 50 Calculating the target operating frequency R of the host 15 x And controls the main unit 15 at the frequency R x And (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.
Wherein the alternate reference frequency is outside the default valid frequency range.
Specifically, in practical applications, the inventors have found that the target operating frequency R of the main machine 15 is calculated from the power performance curve of the main machine 15 at the default reference frequency x When the difference value between the target operating frequency and the default reference frequency is larger, the calculated target operating frequency R is x There may be some error that may result in excess or deficiency of the exhaust power provided by the main machine 15 in the ideal case.
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 computer 15 is calculated from the power performance curve of the host computer 15 under the default reference frequency x The calculated target operating frequency R of the host computer 15 is within the default effective frequency range x The accuracy is high; and a target operating frequency R of the main machine 15 when calculated from the power performance curve of the main machine 15 at the default reference frequency x When the target operating frequency R of the host computer 15 is out of the default effective frequency range x There will be some error.
Wherein the default effective frequency range is determined by the default reference frequency, optionally, the default effective frequency range is a continuous numerical range including the default reference frequency, the upper limit value of the default effective frequency range may be less than or equal to 150% of the default reference frequency, and the lower limit value of the default effective frequency range may be greater than or equal toEqual 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 15 is calculated from the power performance curve of the host 15 at the default reference frequency x Less than 40Hz, or, more than 50Hz, the target operating frequency R x There 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 15 when calculated from the power performance curve of the main machine 15 at the default reference frequency x Determining a target operating frequency R when outside of the default effective frequency range x The standby effective frequency range, and thus the target operating frequency R x The alternate effective frequency range in which the alternate effective frequency range is located determines the alternate reference frequency, e.g., when the target operating frequency R of the host 15 is calculated from the power performance curve of the host 15 at the default reference frequency x At 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 /Q 0 2 )*Q 2 And the power performance curve f of the power fan device of the main machine 15 at the standby reference frequency of 30Hz 30 (P, Q) determining the drag coefficient P for the host 15 at the alternate reference frequency of 30Hz 0 /Q 0 2 Operating point information (P) of 30 ，Q 30 ) And the relation between the frequency and the air volume is as follows: r x /30＝Q 0 /Q 30 Calculating the target operating frequency R of the host computer 15 x Thereby 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 those skilled in the art according to actual needs.
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.
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 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 ci When the air volume is less than or equal to 0, the starting terminal machine of each floor does not need additional air exhaust power when reaching the corresponding target air exhaust volume, and at the moment, the starting terminal machine of each floor does not need additional air exhaust powerThe target operating frequency of the host 15 may be set to 0, i.e., the power fan device of the host 15 is not turned on, which helps to reduce power consumption.
Optionally, determining a target opening degree of a power distribution valve corresponding to each starting terminal according to the maximum exhaust power demand value, including:
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.
Wherein, when the maximum exhaust power demand value MaxP ci When 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 11 corresponding to the starting terminal machine is determined to be 90 degrees so as to completely open the power distribution valve 11, so that the power distribution valve 11 is prevented from providing a resistance coefficient to reduce the air discharge quantity, and the power consumption is reduced.
Further, when the maximum exhaust power demand value MaxP ci When 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 15 can enable the air exhaust power required value MaxP ci When the maximum terminal reaches its target air exhausting quantity, the other air exhausting power demand value P ci The 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 ci And determining a target resistance coefficient of the power distribution valve 11 corresponding to each starting-up terminal, determining a target opening degree of the power distribution valve 11 according to the target resistance coefficient, and providing a certain resistance coefficient through the power distribution valve 11 of each floor to adjust the resistance, so as to adjust the air exhaust volume of each floor starting-up terminal. Wherein the power distribution valve 11The smaller the opening degree is, the larger the resistance coefficient can be provided, so that the exhaust power requirement values of all floors under the target exhaust air volume can approach the maximum exhaust power requirement value MaxP by adjusting the target opening degrees of the power distribution valves 11 of different floors to be different ci Therefore, the air exhaust volume of the starting terminal machine on different floors approaches to the target air exhaust volume, and the air exhaust requirements of users on different floors under different cooking scenes are met.
Specifically, for each starting terminal, the exhaust power demand value P can be calculated ci And maximum exhaust power demand value MaxP ci Difference value MaxP between ci -P ci As a difference in resistance Δ P ix Then according to the difference value of the resistance delta P ix Calculating the target exhaust air quantity Q of the power distribution valve 11 at the corresponding starting terminal zx (Q z Is Q Z1 、Q Z2 And Q Z3 Some of) the target resistance coefficient ξ that needs 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 degree-resistance characteristic relation f (xi) of the power distribution valve of each floor can be used i θ) calculating a target opening θ of the power distribution valve i For 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 11, the larger the resistance coefficient that can be provided, the maximum opening of the power distribution valve 11 may be 90 °, at which time, the resistance coefficient provided by the power distribution valve 11 is the smallest, and according to the opening-resistance characteristic relationship f (ξ) i θ), can be represented by a drag coefficient ξ ix The opening degree corresponding to the power distribution valve 11 is found as the target opening degree theta i 。
Wherein, the opening degree-resistance characteristic relation f (xi) i θ) can be obtained by laboratory measurements, but is not limited thereto.
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 S110, numbering power distribution valves installed in kitchens of all floors of the same public flue in sequence 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 S120, acquiring a startup and shutdown signal and a gear change signal of the range hood in real time by the power distribution valves of all floors, and broadcasting the signals to a central range hood set network 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 Z2 And Q Z3 And corresponds to X1 (low), X2 (middle) and X3 (high/quick frying) of terminal one by one, namely Q Z1 Target exhaust volume, Q, corresponding to X1 gear Z2 Target exhaust volume, Q, corresponding to X2 gear Z3 Corresponding to the target exhaust air quantity of X3 gear, and Q Z1 ＜Q Z2 ＜Q Z3 。
S130, counting the number m of terminals with X1 level in the central range hood system 1 Number m of X2 grade terminals 2 Number m of X3 grade terminals 3 And floor position F of each starting terminal machine in central range hood system i The 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，m 1 ，m 2 ，m 3 ，F i ，h)。
According to the power performance curve of the terminal machine at the X1 gearf 1 (P, Q) obtaining the target exhaust volume Q of the terminal machine Z1 Resistance P overcome x1 (ii) a According to the power performance curve f of the terminal machine at the X2 gear 2 (P, Q) obtaining the target exhaust volume Q of the terminal machine Z2 Resistance P overcome x2 (ii) a According to the power performance curve f of the terminal machine at the X3 gear 3 (P, Q) obtaining the target exhaust volume Q of the terminal machine Z3 Resistance 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 xy Is P x1 、P x2 、P x3 One of them is determined by the gear of the starting terminal machine), and the exhaust power requirement value P is obtained ci The maximum value in the air exhaust is taken as the maximum exhaust power demand value MaxP ci 。
S131, when MaxP ci When the temperature is less than or equal to 0, the power fan equipment of the main machine is not started.
S132, when MaxP ci When 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 ,Q 0 ) Wherein the wind pressure value P of the main engine at the working point 0 ＝MaxP ci Air quantity value Q of the main engine at the working point 0 ＝1.15*(m 1 *Q Z1 +m 2 *Q Z2 +m 3 *Q Z3 ) (wherein, 1.15 is the air leakage rate coefficient of the system common flue).
S133, calculating a system resistance characteristic curve P (P) which needs to be overcome by the host machine under the current working condition 0 /Q 0 2 )*Q 2 Combining with the power performance curve f of the host at the default reference frequency of 50Hz 50 (P, Q), calculating the intersection point of the two curves to further obtain the resistance coefficient P corresponding to the host under the default reference frequency of 50Hz under the current working condition 0 /Q 0 2 Default reference air volume value Q 50 。
S134, according to a relation between the rotating speed (frequency) of the alternating current motor and the air volume: r x /50＝Q 0 /Q 50 Calculating the target operating frequency R of the host computer 15 x And controlling the host to frequencyRate R x And (4) 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:
s141, when MaxP ci When 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.
S142, when MaxP ci When the air exhaust power requirement value is more than 0, calculating the air exhaust power requirement value P ci And maximum exhaust power demand value MaxP ci Difference value MaxP between ci -P ci As a difference in resistance Δ P ix 。
S143, according to the resistance difference value delta P ix Calculating the target exhaust air quantity Q of the power distribution valve at the corresponding starting terminal machine zx (Q zx Is Q Z1 、Q Z2 And Q Z3 Some of) the target resistance coefficient ξ that needs to be adjusted ix ＝ΔP ix /(Q zx *Q zx )。
S144, according to the opening-resistance characteristic relation f (xi) of the power distribution valve measured in the laboratory i Theta) calculating a target opening degree theta of the power distribution valve i And controlling the power distribution valve to perform the target opening degree theta i 。
S151, detecting a wind pressure value P inside an exhaust pipe corresponding to the startup terminal machine in real time by a wind pressure sensor si And comparing the wind pressure value with the wind pressure value corresponding to the target air discharge quantity at the current gear of the starting terminal machine to obtain the target opening theta of the power distribution valve i And (5) performing feedback adjustment. Wherein, the wind pressure value corresponding to the target air discharge quantity of the starting terminal machine at the current gear is equal to the air discharge resistance value P when the starting terminal machine reaches the target air discharge quantity at the current gear xy 。
S152, when P si ≤P xy Target opening degree theta of power distribution valve i Without correction, according to the originally calculated target opening theta i And (4) opening.
S153, when P si ＞P xy Opening degree theta of power distribution valve i Increase 1 degree, gather again and exhaustWind pressure value P inside pipe si And judging P again si And P xy Until P si ≤P xy This is true.
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, 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, and performs feedback adjustment through the wind pressure value in the exhaust pipe, 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, and a power distribution valve, a terminal machine, an exhaust pipe and a wind pressure sensor which are positioned on each floor, the terminal machine on each floor is connected with the common flue through the exhaust pipe, and the power distribution valve and the wind pressure sensor are arranged in the exhaust pipe.
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 the maximum exhaust power requirement value determining module 31 is used for determining the maximum exhaust power requirement value of the starting terminal according to the current working condition information.
And the target opening determining module 32 is used for determining the target opening of the power distribution valve corresponding to each starting terminal according to the maximum exhaust power requirement value.
And a target opening executing module 33 for controlling the power distribution valve to execute the target opening.
And the actual wind pressure value acquisition module 34 is used for acquiring the wind pressure value of the exhaust duct through the wind pressure sensor.
And the target opening adjusting module 35 is used for adjusting the target opening of the power distribution valve according to the wind pressure value of the exhaust pipe.
The control device of the central range hood system provided by the embodiment of the invention obtains the gear of the starting terminal machine, the target air exhaust volume of the starting terminal machine under the gear, the number of the starting terminal machines under each gear and other current working condition information 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 opening of the power distribution valve corresponding to each starting terminal machine according to the maximum air exhaust power demand value through the target opening determining module 32, so that the power distribution valves of each floor provide proper resistance coefficients, the air exhaust power demand values of each floor under the target air exhaust volume are close to the maximum air exhaust power demand value, and the air exhaust volumes of the starting terminal machines of different floors are close to the target air exhaust volumes, the air exhaust requirements of users on all floors under different cooking scenes are met. Meanwhile, the actual wind pressure value in the exhaust pipe fed back by the wind pressure sensor is obtained through the actual wind pressure value obtaining module 34, the target opening of the power distribution valve is adjusted through the target opening adjusting module 35 according to the wind pressure value of the exhaust pipe, the actual exhaust volume of the exhaust pipe is adjusted to reach the target exhaust volume of the starting terminal machine connected with the exhaust pipe, and therefore the requirements of exhaust smoke in different cooking scenes are met more accurately, and the kitchen cooking environment is kept fresh and healthy.
Optionally, the maximum exhaust power requirement determining module 31 includes:
and the air exhaust resistance value calculating 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 calculation 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 opening degree adjusting module 35 is specifically configured to:
when the wind pressure value of the exhaust pipe is larger than the exhaust resistance value of the starting terminal machine when the target exhaust amount is reached, the target opening degree of the power distribution valve is increased.
Optionally, the target opening degree adjusting module 35 is further specifically configured to:
when the air pressure value of the exhaust pipe is larger than the exhaust resistance value of the starting terminal machine when the starting terminal machine reaches the target exhaust volume, the target opening of the power distribution valve is increased by a preset opening value, wherein the preset opening value is theta, and theta is larger than or equal to 0.5 degrees and smaller than or equal to 1.5 degrees.
Optionally, the target opening degree adjusting module 35 is further specifically configured to:
when the wind pressure value of the exhaust pipe is less than or equal to the exhaust resistance value of the starting terminal machine when the target exhaust amount is reached, the target opening of the power distribution valve is unchanged.
Optionally, the central extractor hood system further comprises a main machine, and the main machine is located in the common flue.
The control device of the central range hood system further comprises:
and 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 target running frequency execution module is used for controlling the host to run at the target running frequency.
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 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 public flue, and a power distribution valve, a terminal machine, an exhaust pipe and a wind pressure sensor which are positioned on each floor, wherein the terminal machine on each floor is connected with the public flue through the exhaust pipe, and the power distribution valve and the wind pressure sensor are arranged in the exhaust pipe.
The central range hood system further comprises a control device of the central range hood system provided by any one of the embodiments, the terminal machines on all floors are connected with the power distribution valves corresponding to the terminal machines, and the control device is respectively in communication connection with the power distribution valves and the wind pressure sensors on all floors.
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.
Optionally, the wind pressure sensor is in communication connection with a control device of the central extractor hood system through a power distribution valve.
Wherein, the wind pressure sensor through setting up each floor is connected with the power distribution valve that corresponds rather than to carry out real-time communication through the controlling means of power distribution valve with central range hood system, thereby can shorten communication cable length, reduce cost.
With continued reference to fig. 2, optionally, the exhaust duct 13 includes a straight-going duct 131, and the wind pressure sensor 14 is disposed in the straight-going duct 131.
For example, as shown in fig. 2, in order to reduce the occupied space of the exhaust duct 13, the exhaust duct 13 may include a straight duct 131 and a curved duct 132, and by disposing the wind pressure sensor 14 in the straight duct 131, the measurement accuracy of the wind pressure sensor 14 may be improved, and the accuracy of the target opening adjustment of the power distribution valve may be ensured.
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 results 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 (10)

1. A control method of a central range hood system is characterized in that the control method is applied to the central range hood system, the central range hood system comprises a common flue, and a power distribution valve, a terminal, an exhaust pipe and a wind pressure sensor which are positioned on each floor, the terminal on each floor is connected with the common flue through the exhaust pipe, and the power distribution valve and the wind pressure sensor are arranged in the exhaust pipe;
the control method comprises the following steps:
s1, 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;
s2, determining the maximum exhaust power requirement value of the starting terminal machine according to the current working condition information;
s3, determining the target opening degree of the power distribution valve corresponding to each starting terminal according to the maximum exhaust power requirement value;
s4, controlling the power distribution valve to execute the target opening degree;
s5, acquiring a wind pressure value of the exhaust duct through the wind pressure sensor;
and S6, adjusting the target opening of the power distribution valve according to the wind pressure value of the exhaust pipe.
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-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.
3. The control method according to claim 2,
adjusting the target opening degree of the power distribution valve according to the wind pressure value of the exhaust duct, comprising:
and when the wind pressure value of the exhaust duct is larger than the exhaust resistance value of the starting terminal machine when the starting terminal machine reaches the target exhaust amount, increasing the target opening of the power distribution valve, and repeating S4-S6.
4. The control method according to claim 3,
increasing the target opening degree of the power distribution valve includes:
and increasing the target opening degree of the power distribution valve by a preset opening degree value, wherein the preset opening degree value is theta, and theta is more than or equal to 0.5 degrees and less than or equal to 1.5 degrees.
5. The control method according to claim 2,
according to the wind pressure value regulation of exhaust pipe the target aperture of power distribution valve still includes:
when the wind pressure value of the exhaust duct is smaller than or equal to the exhaust resistance value of the starting terminal machine when the starting terminal machine reaches the target exhaust volume, the target opening of the power distribution valve is unchanged.
6. The control method according to claim 1,
the central range hood system also comprises a host machine, and the host machine is positioned in the common flue;
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:
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.
7. 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, and a power distribution valve, a terminal, an exhaust pipe and a wind pressure sensor which are positioned on each floor, the terminal on each floor is connected with the common flue through the exhaust pipe, and the power distribution valve and the wind pressure sensor are arranged in the exhaust pipe;
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 opening determining module is used for determining the target opening of the power distribution valve corresponding to each starting terminal machine according to the maximum exhaust power requirement value;
the target opening control module is used for controlling the power distribution valve to execute the target opening;
the air pressure value acquisition module is used for acquiring the air pressure value of the exhaust pipe through the air pressure sensor;
and the target opening adjusting module is used for adjusting the target opening of the power distribution valve according to the wind pressure value of the exhaust pipe.
8. A central range hood system is characterized by comprising a public flue, and a power distribution valve, a terminal, an exhaust pipe and a wind pressure sensor which are positioned on each floor, wherein the terminal on each floor is connected with the public flue through the exhaust pipe;
the central extractor hood system further comprises a control device of the central extractor hood system of claim 7.
9. The central extractor hood system of claim 8,
and the wind pressure sensor is in communication connection with a control device of the central range hood system through the power distribution valve.
10. The central extractor hood system of claim 8,
the exhaust pipe includes the craspedodrome section pipeline, wind pressure sensor set up in craspedodrome section pipeline.
CN202210379664.8A 2022-04-12 2022-04-12 Central range hood system and control method and control device thereof Active CN114811686B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN211903019U (en) * 2020-03-23 2020-11-10 海信(广东)厨卫系统有限公司 Range hood and building flue system
CN212457040U (en) * 2020-06-19 2021-02-02 杭州老板电器股份有限公司 Central smoke exhaust ventilator
CN113405138A (en) * 2021-07-20 2021-09-17 杭州老板电器股份有限公司 Pipeline flow distribution system and central range hood system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN211903019U (en) * 2020-03-23 2020-11-10 海信(广东)厨卫系统有限公司 Range hood and building flue system
CN212457040U (en) * 2020-06-19 2021-02-02 杭州老板电器股份有限公司 Central smoke exhaust ventilator
CN113405138A (en) * 2021-07-20 2021-09-17 杭州老板电器股份有限公司 Pipeline flow distribution system and central range hood system

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