CN115789731A

CN115789731A - Control method, control device, system and storage medium of central smoke machine system

Info

Publication number: CN115789731A
Application number: CN202211527721.9A
Authority: CN
Inventors: 李昱澎; 王文煜; 陈志夫; 胡斯特; 李佳阳; 郑志伟
Original assignee: Midea Group Co Ltd; Guangdong Midea White Goods Technology Innovation Center Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea White Goods Technology Innovation Center Co Ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-03-14
Also published as: WO2024113801A1

Abstract

The invention discloses a control method and a control device of a central cigarette machine system, the central cigarette machine system and a computer readable storage medium. The control method of the central cigarette machine system comprises the following steps: acquiring model information and gear information of all opened branch smoke ventilators, wherein the branch smoke ventilators are connected with a common smoke exhaust pipeline; acquiring physical parameters of all opened branch line range hoods through a local database and/or a server according to the model information of the branch line range hoods; adjusting pneumatic parameters in a control algorithm according to physical parameters of the branch-circuit range hood; calculating the required air volume of the branch range hood according to the model information and the gear information of the branch range hood; and calculating the rotating speed required by meeting the required air volume by using a control algorithm and sending the rotating speed to the branch-circuit range hood so as to enable the branch-circuit range hood to operate according to the rotating speed. By the control method, even if the model of the range hood is changed by a user, the branch range hood can be accurately controlled to operate, and user experience is improved.

Description

Control method, control device, system and storage medium of central smoke machine system

Technical Field

The invention relates to the technical field of smoke exhaust equipment, in particular to a control method and a control device of a central smoke exhaust machine system, the central smoke exhaust machine system and a computer readable storage medium.

Background

In the related art, the central cigarette making machine system can control the operation of each terminal cigarette making machine according to the model number of the terminal cigarette making machine and the installation position of the terminal cigarette making machine. However, the user may require the terminal cigarette maker to be changed for reasons such as usage habits or personal preferences, which may cause two problems: firstly, when the models of the terminal cigarette machines are different, the performances of the fans are different, which can cause the misalignment and even the failure of the original control model and the corresponding open-loop control algorithm; secondly, the smoke collecting covers of different types of terminal range hoods have different structures, so that the required air volume is different when the same smoke suction effect is achieved.

Disclosure of Invention

The embodiment of the invention provides a control method and a control device of a central cigarette machine system, the central cigarette machine system and a computer readable storage medium.

The control method of the central cigarette making machine system in the embodiment of the invention comprises the following steps:

acquiring model information and gear information of all opened branch line range hoods, wherein the branch line range hoods are connected with a common smoke exhaust pipeline;

according to the model information of the branch range hoods, acquiring physical parameters of all opened branch range hoods through a local database and/or a server;

adjusting pneumatic parameters in a control algorithm according to the physical parameters of the branch-circuit range hood;

calculating the required air volume of the branch range hood according to the model information and the gear information of the branch range hood;

and calculating the rotating speed required by meeting the required air volume by using the control algorithm and sending the rotating speed to the branch range hood so that the branch range hood runs according to the rotating speed.

According to the control method, the physical parameters of all opened branch line range hoods can be obtained through the local database and/or the server, and the control algorithm is correspondingly adjusted to obtain the required rotating speed, so that even if the model of the range hood is changed by a user, the branch line range hood can be accurately controlled to operate, and the user experience is improved.

In some embodiments, obtaining, by a local database and/or a server, physical parameters of all opened branch range hoods according to the model information of the branch range hoods includes:

matching the models of the branch line range hoods by using the models of the range hoods stored in the local database;

under the condition that the model is successfully matched, determining physical parameters of the branch range hood according to the local database;

and under the condition that the model with the matching failure exists, sending the model with the matching failure to the server, and receiving the physical parameters returned by the server.

and sending the models of all opened branch line range hoods to the server, and receiving the physical parameters of all opened branch line range hoods returned by the server.

In certain embodiments, the control method comprises:

and updating the physical parameters of the range hood stored in the local database by using the physical parameters returned by the server.

In some embodiments, the control method further comprises:

and calculating the rotating speed required by the top end fan by using the control algorithm and sending the rotating speed to the top end fan so as to enable the top end fan to operate according to the rotating speed, wherein the top end fan is communicated with the outlet of the public smoke exhaust pipeline.

In some embodiments, calculating the rotational speed required to meet the required air volume using the control algorithm comprises:

calculating the total pressure of the common smoke exhaust pipeline at the downstream of each branch outlet of the common smoke exhaust pipeline, the three-way confluence loss of the layer where the branch range hood is located and the branch corrugated pipe loss by using the control algorithm;

calculating the total pressure rise required by the branch range hood at the mth layer according to the total pressure of the common smoke exhaust pipeline at the downstream of each branch outlet, the three-way confluence loss of the layer where the branch range hood is located and the branch corrugated pipe loss;

determining the layer where the minimum total pressure rise value is located and the required air volume of the branch range hood of the layer where the minimum total pressure rise value is located in the calculated total pressure rise required by each layer of branch range hoods, determining the rotating speed required by meeting the required air volume in a preset range hood pneumatic characteristic relation, and setting the rotating speed as the rotating speed of the branch range hood of the layer where the minimum total pressure rise value is located.

In some embodiments, the rotating speed required for meeting the required air volume is determined as the lowest rotating speed in a preset aerodynamic characteristic relation of the range hood.

In some embodiments, the common flue gas duct total pressure downstream of each leg outlet comprises a top leg outlet total pressure and an mth leg outlet total pressure downstream of the top leg,

calculating the total pressure of the common smoke exhaust pipeline at the downstream of each branch outlet of the common smoke exhaust pipeline by using the control algorithm comprises the following steps:

calculating the downstream total pressure of the top layer branch outlet according to the total pressure at the inlet of the top end fan and the on-way loss of the downstream of the top layer branch outlet to the inlet of the top end fan;

and calculating to obtain the total downstream pressure of the mth layer of branch outlet according to the total downstream pressure of the mth +1 layer of branch outlet, the on-way loss from the mth layer of branch outlet to the mth +1 layer of branch outlet in the common smoke exhaust pipeline, and the main flow direct current loss of the (m + 1) th layer of branch outlet.

In some embodiments, the total pressure rise required by the mth layer branch range hood is obtained by subtracting the three-way confluence loss of the mth layer from the total pressure of the common smoke exhaust pipeline downstream of the mth layer branch outlet and the branch corrugated pipe loss.

In certain embodiments, the control method comprises:

calculating the real total pressure rise of the outlet of the branch range hood of the layer where the minimum total pressure rise value is located and a system pressure correction value according to the rotating speed and the required air volume of the branch range hood of the layer where the minimum total pressure rise value is located;

correcting the total pressure rise required by the range hood of each layer of branch except the minimum total pressure rise and the static pressure rise required by the top end fan according to the system pressure correction value;

and calculating the rotating speed of each layer of branch range hood according to the total pressure rise required by each layer of branch range hood obtained after correction and the required air volume of each layer of branch range hood, and calculating the rotating speed of the top end fan by using the required static pressure rise of the top end fan obtained after correction and the air volume of the top end fan.

In some embodiments, the physical parameters include a first relation between the total pressure rise and the rotating speed of the range hood and the air volume, a second relation between the required air volume of the range hood and the gear, a third relation between the resistance coefficient of the corrugated pipe and the air volume, a first distance between the outlet of the top branch and the inlet of the top fan, and a second distance between the outlet of the mth branch and the outlet of the (m + 1) th branch, wherein the first relation is a physical parameter related to the model of the branch range hood, the second relation is a third relation, and the first distance and the second distance are physical parameters related to the model of the branch range hood.

In certain embodiments, the control method comprises:

after the branch range hood is opened, the electric control valve is controlled to be opened in a linkage mode, and the electric control valve is connected with the branch range hood and the public smoke exhaust pipeline.

In certain embodiments, the control method comprises:

acquiring the installation position information of the branch-circuit range hood;

and adjusting parameters related to the installation position of the branch range hood in the control algorithm according to the installation position information.

A control device of a central cigarette machine system according to an embodiment of the present invention includes a processor and a memory, the memory storing a computer program that, when executed by the processor, implements the steps of the control method according to any one of the above-described embodiments.

A central cigarette making machine system of the embodiment of the invention comprises the control device of the embodiment.

Embodiments of the present invention provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the control method of any of the above embodiments.

According to the control device, the central range hood system and the computer readable storage medium, all opened physical parameters of the branch range hoods can be obtained through the local database and/or the server, and the control algorithm is correspondingly adjusted to obtain the required rotating speed, so that even if the model of the range hood is changed by a user, the branch range hoods can be accurately controlled to operate, and the user experience is improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic flow diagram of a control method according to an embodiment of the invention;

figure 2 is a schematic illustration of the installation of a central cigarette maker system according to an embodiment of the present invention;

FIG. 3 is a schematic flow chart of a control method of an embodiment of the present invention;

FIG. 4 is a schematic view of a one-dimensional pneumatic module of a central cigarette machine system flow of an embodiment of the present invention;

FIGS. 5 to 6 are schematic flow charts of a control method according to an embodiment of the present invention;

figure 7 is a modular schematic of a central cigarette maker system according to an embodiment of the present invention;

FIG. 8 is a schematic structural view of a conventional smoke evacuation system of a high-rise residential building in the related art;

fig. 9 is a schematic structural diagram of a centralized central extractor hood system in the related art;

fig. 10 is a schematic structural diagram of a distributed central extractor hood system in the related art.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

The disclosure herein provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described herein. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

In the related art, the conventional smoke exhaust system of a high-rise residential building is composed of a common smoke exhaust pipeline and branches of each user terminal. As shown in fig. 8, the oil smoke at the user end is discharged from the branch to the common smoke exhaust duct, then flows upwards along the common smoke exhaust duct and is discharged from the top end of the common smoke exhaust duct. For low-rise users, the smoke discharge resistance mainly comes from a public smoke discharge pipeline, including the on-way loss of the public smoke discharge pipeline and the confluence loss when the smoke flows through the branch smoke discharge ports of the users on the upper opening layers. Therefore, when the number of opening layers is large, the smoke exhaust resistance of a low-layer user is high, the smoke exhaust amount of the range hood is insufficient, and the actual smoke exhaust effect is poor.

Although the prior range hood product technology is iterated towards the direction of large air volume and low noise, the air volume and the noise level cannot be considered due to extremely high smoke discharge resistance under partial actual use conditions. Meanwhile, the embarrassing situation that the actual air volume of a high-rise user is excessive and the actual air volume of a low-rise user is insufficient due to the fact that the smoke discharge resistance of the high-rise user and the smoke discharge resistance of the low-rise user are greatly different from each other is caused, and the waste of energy of the high-rise user is brought while the smoke discharge effect of the low-rise user is poor. In addition, in order to prevent the oil smoke of the public smoke exhaust pipeline from flowing back to the user end, a passive flue check valve is usually additionally arranged at the joint of the branch of the user end and the public smoke exhaust pipeline. When the branch range hood is closed, the flue check valve is normally kept in a closed state under the action of the elastic force of the spring and the gravity of the valve plate, so that the oil smoke of the public smoke exhaust pipeline cannot flow into a branch of a user end; when the branch range hood is opened, the fluid discharged to the public smoke exhaust pipeline in the branch can overcome the spring force of the flue check valve and the gravity of the valve plate to open the valve plate. However, such passive check valves have several disadvantages: (1) when the branch air quantity is low, the opening angle of the valve plate is too small, and the smoke exhaust resistance is very large; (2) the problems of aging failure of a spring of a flue check valve, oil smoke adhesion of a valve plate and the like can influence the sealing property of the valve plate when the valve plate is closed, so that the oil smoke flows backwards.

Therefore, the smoke discharge problem of the high-rise residential building is a systematic problem and needs to be solved by adopting a system-level regulation and control means. Therefore, the central cigarette machine system is produced at the same time. The central smoke exhaust machine system generally takes a top end fan positioned at an outlet of a public smoke exhaust pipeline as a main or only power source, and can cooperatively regulate and control the working state of each part of the whole smoke exhaust system in real time through a host according to the air quantity required by a user side, so that the smoke exhaust requirement of the user side can be met under all working conditions.

The central cigarette machine systems can be divided into two types, a centralized type and a distributed type, according to the branch power distribution mode, and schematic diagrams of the two types of central cigarette machine systems are shown in fig. 9 and 10.

Referring to fig. 9, the branch of the centralized central smoke machine system has no smoke exhaust ventilator but only has one smoke collecting hood, and the whole system uses the top end fan as the only power source. A joint of a branch of the centralized central smoke exhaust system and a public smoke exhaust pipeline is provided with an electric control valve with an adjustable opening angle of a valve plate, and the branch air quantity distribution can be realized by adjusting the opening angle of the valve plate when the system works.

Referring to fig. 10, the branch of the distributed central range hood system is provided with a speed-adjustable range hood, the whole system uses a top end fan as a main power source, and the branch range hood as an auxiliary power source. The branch outlet of the distributed central smoke machine system is provided with an electric control valve with a valve plate opening angle, and the check valve has two states of ON/OFF (fully open/fully closed). When the system works, the branch air quantity distribution can be realized by adjusting the rotating speed of the branch range hood.

Each of the two types of central cigarette machine systems has its own advantages due to differences in system components and operating mechanisms. The advantages of the centralized central cigarette machine system are mainly reflected in that: the public smoke exhaust pipeline is in a full-flue negative pressure state, so that the oil smoke can be strictly prevented from flowing back into a user kitchen from the public smoke exhaust pipeline; because the branch circuit has no range hood, the noise of the branch circuit is greatly reduced, and the amplitude reduction can reach 10dB; in addition, because the branch of the centralized central smoke exhaust system has no occupied space of the range hood, the occupied size of the branch smoke exhaust collecting hood is smaller, and the appearance design can be more flexible and more attractive.

The distributed central smoke machine system has the advantages that: because the branch check valves of the distributed central smoke machine system always keep the fully opened state of the system when branches work, and the system resistance is lower than that of the centralized type under the same working condition, the overall energy consumption level is also better than that of the centralized type; the branch smoke exhaust ventilator of the distributed system can realize the oil-smoke separation function of the traditional smoke exhaust ventilator, and the sewage is not easy to collect in the branch flue; the distributed central smoke machine system has the branch smoke machine as an auxiliary power source, so that the requirement on the working parameters of the top end fan is low, the smoke exhaust function can be realized by the branch smoke machine when the top end fan fails, the system redundancy is high, and the reliability is high.

However, no matter the centralized or distributed central smoke machine system, how to realize efficient and accurate branch air volume distribution is the most critical problem. There are two types of mainstream air volume distribution control methods: one is a closed-loop control system based on feedback control of a pressure sensor or a flow rate sensor, and the sensor is easy to lose efficacy and poor in system reliability due to serious oil smoke pollution in a smoke exhaust system, and the cost of the sensor and the later maintenance cost are also practical problems; and the other type is an open-loop control method based on a system one-dimensional pneumatic model, and has lower cost and higher reliability in practical application.

For a distributed central range hood system, all branch range hoods in the related technology are of the same type, a one-dimensional pneumatic model and a corresponding open-loop control strategy are also established under the condition, and the terminal air volume is uniformly given according to the characteristics of the smoke collecting hood of the range hood of the type. However, for the distributed central range hood system, a user may require to change the model of the terminal range hood due to use habits or personal preferences, which may cause two problems: firstly, when the range hood is in a model, the fan performance and the installation state of branch corrugated pipes are different, which can cause the misalignment and even failure of the original one-dimensional pneumatic model and the corresponding open-loop control algorithm; secondly, the structures of the smoke collecting hoods of the range hoods with different models are different, so that the required air volume is different when the same oil smoke absorption effect is achieved. Based on the open-loop control strategy, the invention provides the terminal range hood with the central range hood system compatible with various models and the corresponding control method.

Referring to fig. 1 and 2, a method for controlling a central cigarette making machine system 100 according to an embodiment of the present invention includes:

101, acquiring model information and gear information of all started branch smoke ventilators 12, wherein the branch smoke ventilators 12 are connected with a common smoke exhaust pipeline 14;

103, acquiring physical parameters of all opened branch line range hoods 12 through a local database and/or a server 24 according to the model information of the branch line range hoods 12;

105, adjusting corresponding aerodynamic parameters in a control algorithm according to the physical parameters of the branch-circuit range hood 12;

step 107, calculating the required air volume of the branch range hood 12 according to the model information and the gear information of the branch range hood 12;

and step 109, calculating the rotating speed required by meeting the required air volume by using a control algorithm and sending the rotating speed to the branch range hood 12 so that the branch range hood 12 operates according to the rotating speed.

According to the control method, the physical parameters of all opened branch line range hoods 12 can be obtained through the local database and/or the server 24, and the control algorithm is correspondingly adjusted to obtain the required rotating speed, so that even if a user changes the model of the range hood, the control method can accurately control the branch line range hood 12 to operate, and the user experience is improved.

Specifically, the central range hood system 100 of the present embodiment may be a distributed central range hood system 100, and the control method is compatible with branch range hoods 12 (terminal range hoods) of various models on the basis of an open-loop control strategy. Referring to fig. 2, a central cigarette making machine system 100 includes: branch lampblack absorber 12, bellows 16, electric control valve 18, public exhaust pipe 14, top fan 20 and host 22. The entire central cigarette machine system 100 is divided into two parts, one being a smoke evacuation flow channel and the other being a control system. The flue gas discharging flow channel comprises: an outlet of the branch range hood 12 is connected with one end of a corrugated pipe 16, the other end of the corrugated pipe 16 is connected with an electric control valve 18, and the branch range hood 12, the corrugated pipe 16 and the electric control valve 18 form a branch together. The plurality of branches are connected with the side wall of the common smoke exhaust duct 14; the upper outlet of the common exhaust duct 14 is connected to a top fan 20. The valve plate of the electric control valve 18 can complete opening and closing actions under the pushing of the motor, and the electric control valve 18 has two states of complete opening and complete closing when working.

The control system includes: the rotating speeds of the branch range hood 12 and the top end fan 20 are adjustable; the host 22 and each branch range hood 12 can carry out data communication; the host 22 and the top fan 20 can perform data communication; the host 22 includes a console capable of performing data reception, data calculation, and data transmission; the host 22 and the server 24 may be in data communication; the electric control valve 18 in each branch can judge whether the branch range hood 12 is started or not by performing data communication with the branch range hood 12 or performing power identification on the branch range hood 12 and the like.

The data information sent by the branch range hood 12 to the host 22 is the range hood ID, the range hood model information and the range hood gear information, the data sent by the host 22 to the range hood is the rotating speed of each branch range hood 12, and the data sent by the host 22 to the top end fan 20 is the rotating speed of the top end fan 20. The data sent by the host 22 to the server 24 is the range hood model information under the control of the host 22, and the data sent by the server 24 to the host 22 is the physical parameters of all the range hood models under the control of the host 22. The physical parameters include, but are not limited to, the corresponding relation between the pneumatic performance, the air outlet position, the gear position and the required air volume of the range hoods of various models and the like.

The opened branch range hood 12 may be the branch range hood 12 in which the fan of the branch range hood 12 is in an opened state, and the rotation speed may be the rotation speed of the fan. After the branch range hood 12 is turned on, the model information and the gear information of the branch range hood can be reported to the host 22 in a wired or wireless manner. The corresponding electrically controlled valve 18 is opened in a linkage manner, so that the branch range hood 12 can discharge the oil smoke into the common smoke exhaust pipeline 14.

After obtaining the model information of all opened branch line range hoods 12, the host 22 may obtain physical parameters of all opened branch line range hoods 12 through the local database and/or the server 24.

In some embodiments, referring to fig. 3, step 103 includes:

step 111, matching the model of the branch-circuit range hood 12 by using the model of the range hood stored in the local database;

step 113, determining physical parameters of the branch-circuit range hood 12 according to a local database under the condition that the successfully matched model exists;

and step 115, in the case that the model with the matching failure exists, sending the model with the matching failure to the server 24, and receiving the physical parameters returned by the server 24. Therefore, matching can be performed on the local database, and then the physical parameters corresponding to the model with failed matching can be obtained through the server 24, so that the efficiency is improved.

Specifically, the local database may be located in the host 22, or may be located in a branch range hood 12, or one part of the local database may be located in the host 22, and another part of the local database may be located in one or some branch range hoods 12, or the local database may be dispersedly located in different branch range hoods 12, which is not limited herein. By first matching the local database, the time delay caused by network problems is reduced, and the efficiency is improved.

The server 24 can be a cloud server 24, and physical parameters of all models of range hoods are stored in the server 24. The server 24 returns the physical parameters corresponding to the range hood model information under the control of the host 22 to the host 22, and the host 22 can update the local database.

In certain embodiments, step 103 comprises:

and sending the models of all opened branch range hoods 12 to the server 24, and receiving the physical parameters of all opened branch range hoods 12 returned by the server 24. In this way, the physical parameters of all opened branch range hoods 12 can be directly obtained through the server 24.

In one embodiment, under the condition of obtaining physical parameters of all opened branch line range hoods 12, the current required air volume of each branch line range hood 12 can be calculated according to the model information and the gear information of each branch line range hood 12. Specifically, the correspondence between the model information of the branch range hood 12 and the gear information and the required air volume may be calibrated and stored in advance. The corresponding relation may be stored in the branch range hood 12, the host 22, or the server 24 in advance. When the model of the branch-circuit range hood 12 fails to be matched with the local database, the host 22 may obtain a corresponding relationship through the server 24.

In one embodiment, after the model information and the gear information of each branch range hood 12 are obtained, the current required air volume of each branch range hood 12 can be calculated by using the corresponding relationship.

In one example, the correspondence is: the model of the branch-circuit range hood 12 is A, gears include 1 gear, 2 gears and 3 gears, and the air volume corresponding to each gear is 200 square/hour, 300 square/hour and 400 square/hour respectively. After the branch range hood 12 of the type a is turned on, and the gear information is 1 gear, the host 22 may determine that the required air volume of the branch range hood 12 is 200 square/hour. The gear can be selected by a user, or the branch range hood 12 can be determined by itself according to the oil smoke amount. Specifically, the branch range hood 12 has a function of sensing smoke, and the branch range hood 12 can automatically determine a gear according to the amount of the smoke. The branch range hood 12 with the smoke following sensing function comprises an oil smoke sensor.

And (4) regulating the rotating speed of each branch range hood 12 and the top end fan 20 according to the received rotating speed information to finish the air volume control process. When the branch range hood 12 is closed, the branch electric control valve 18 can be closed along with the linkage of the range hood after identifying the shutdown action of the range hood, and meanwhile, the branch range hood 12 does not upload information to the host 22 any more.

In some embodiments, a control method comprises:

and updating the physical parameters of the range hood stored in the local database by using the physical parameters returned by the server 24. Therefore, the physical parameters of the branch-circuit range hood 12 can be obtained quickly subsequently.

Specifically, the physical parameters of the range hood in the local database are updated by using the physical parameters returned by the server 24, and when the branch range hood 12 is opened again, the host 22 can directly and quickly obtain the physical parameters of all branch range hoods 12 in the local database, so that the efficiency is improved.

In some embodiments, the control method further comprises:

and calculating the rotating speed required by the top end fan 20 by using a control algorithm and sending the rotating speed to the top end fan 20 so that the top end fan 20 operates according to the rotating speed, wherein the top end fan 20 is communicated with the outlet of the public smoke exhaust pipeline 14. In this manner, the top end fan 20 can be controlled.

Specifically, the step may be performed in step 109, may be performed simultaneously with step 109, may be performed before or after step 109, and is not limited herein.

In the embodiment shown in figure 2, the central cigarette maker system 100 includes a top end blower 20. The top end fan 20 and the branch range hood 12 are matched with each other, so that the smoking effect of the branch range hood 12 can be optimized, and the noise can be improved. For example, after the top end fan 20 is turned on, the pressure of the common smoke exhaust pipeline 14 is reduced, the resistance of the branch range hood 12 is reduced, the rotating speed of the branch range hood 12 can be smaller under the condition that the same required air volume is achieved, and the noise of the branch range hood 12 is reduced. Or under the condition of the same branch range hood 12 rotating speed, the air quantity provided by the branch range hood 12 is larger, and the smoking effect is improved.

In the embodiment of the invention, the control algorithm can be an open-loop control algorithm, and the pneumatic characteristics of the system components can be subjected to test calibration or empirical formula estimation in advance. The flow of the central cigarette machine system 100 can be simplified to a one-dimensional pneumatic model, as shown in figure 4, which can be broken down into several components as follows: a branch range hood 12; a bellows 16; a tee 26; a common exhaust duct 14; a top end fan 20. Wherein, the tee 26 is a tee area formed by the inlet of the branch to the public smoke exhaust 14 and the public smoke exhaust 14: three-way confluence loss occurs when the branch flow flows through the three-way region and flows into the common exhaust flue 14; three-way direct current loss occurs when the common flue gas exhaust duct 14 flows through the three-way region; when the opening angle of the valve plate is fixed, the three-way confluence loss coefficient and the three-way direct current loss coefficient are determined by the air volume ratio (Q/Q _ main) of the branch and the public smoke exhaust pipeline 14 (the following formula 3-4). The aerodynamic characteristics of each component may be determined by experimental, simulation, or empirical formula estimation. The pneumatic characteristic expression of each component is as follows:

Pt_yanji＝F ₁ (N _ yanji, Q) (formula 1)

ξ_b＝F ₂ (Q) (formula 2)

ξ_con＝F ₃ (Q/Q _ main) (formula 3)

ξ_dir＝F ₄ (Q/Q _ main) (formula 4)

λ＝F ₅ (Q _ main) (formula 5)

Ps_dingduan＝F ₆ (N _ dingduan, Q _ total) (formula 6)

Wherein, pt _ yanji is the total pressure rise of the range hood;

n _ yanji-rotational speed of the range hood;

q is the air quantity required by the range hood;

ξ -b-the bellows 16 drag coefficient;

ξ _ con — branch three-way confluence loss coefficient;

ξ _ dir — the three-way direct current loss coefficient of the common smoke exhaust duct 14;

λ -the loss coefficient of the common flue gas duct 14 along the way;

q _ main-the required air volume of the converged public smoke exhaust pipeline 14;

ps _ dingduan — top fan 20 static pressure rise;

n _ dingduan — top fan 20 speed;

q _ total-total air volume of the common smoke exhaust pipeline 14 (air volume required by the top end fan 20);

Q_main _m the total required air volume of the public smoke exhaust pipeline 14 at the downstream of the mth layer;

Q _i the branch range hood 12 on the ith layer requires air volume;

m is the total number of layers;

m-the mth layer;

i-ith layer;

when the system is in operation, the host 22 receives the model information and the gear information of all the branch line range hoods 12 which are started currently, and determines the required air quantity Q of each branch line range hood 12 according to the information _i Therefore, the air quantity distribution Q _ main of the public exhaust flue 14 can be obtained according to the formulas 7 and 8 _m And Q _ total, and further obtaining resistance characteristic parameters xi _ b, xi _ con, xi _ dir and lambda of the system through an equation 2-5. Assuming that the static pressure rise provided by the top fan 20 is Ps _ X, the total pressure at the inlet of the top fan 20 may be expressed as

Pt_dingduan＝0.5·ρV_fan ² -Ps _ X (formula 9)

Wherein V _ fan, the average wind speed at the outlet of the top fan 20, and ρ, the air density, can be obtained according to Q _ total and the outlet area of the top fan 20.

The total pressure Pt _ down of the common smoke exhaust pipeline 14 at the downstream of the outlets of the branches can be obtained firstly. Total pressure Pt _ down at outlet of top layer (Mth layer) branch _M The on-way loss downstream from the top (mth) branch outlet to the inlet of the top fan 20 can be subtracted from Pt _ dingduan (equation 10).

Wherein λ is _M -the drag coefficient of the common flue gas duct 14 downstream of the top (mth) branch outlet;

de-the hydraulic diameter of the common flue gas duct 14;

L _M distance of the top (mth) branch outlet from the inlet of the top blower 20;

ρ -air density;

V_main _M average wind speed of the common flue gas duct 14 downstream of the top (mth) level branch outlet,

corresponding to V _ fan.

The total pressure Pt _ down at the downstream of the branch outlet of the mth layer except the topmost layer _m The total pressure Pt _ down at the downstream of the outlet of the branch with the m +1 layers can be used _m+1 Subtracting the on-way loss from the downstream of the mth layer branch outlet to the upstream of the m +1 layer branch outlet in the common smoke exhaust pipeline 14, and subtracting the main stream direct current loss of the m +1 layer to obtain the (formula 11). Therefore, the total pressure Pt _ down of the common smoke exhaust pipes 14 at the downstream of all the floor branch outlets can be obtained in sequence.

Wherein λ is _m The resistance coefficient of the common flue gas duct 14 downstream of the mth tier branch outlet;

L _m the distance between the mth layer and the branch outlet of the (m + 1) th layer;

ξ_dir _m+1 and a common smoke exhaust pipeline 14 three-way direct current loss coefficient at the outlet of the branch of the (m + 1) th layer.

For example, when the total number of floors is 10 and the branch range hoods 12 of 10 floors are all opened, the total pressure Pt _ down downstream of the branch outlet of the top floor (10 th floor) can be calculated by using the formula 10 ₁₀ Pt _ down according to layer 10 using equation 11 ₁₀ Calculating the downstream total pressure Pt _ down of the branch outlet of the 9 th layer ₉ According to the total pressure Pt _ down of the branch outlet downstream of the 9 th layer ₉ The total pressure Pt _ down at the outlet of the branch at the 8 th layer can be calculated ₈ …, up to the lowest floor where the branch cooker hood 12 is opened, and so on.

Secondly, the total pressure rise Pt _ yanji required by the branch range hood 12 at the mth layer _m The sum of the three-way confluence loss and the branch bellows 16 loss can be subtracted from Pt _ down (equation 12).

Wherein ξ _ con _m -branch three-way confluence loss coefficient of the mth layer;

ξ_b _m the resistance coefficient of the bellows 16 of the mth layer;

V _m -average wind speed of the mth layer branch.

Thirdly, according to the optimization principle of the lowest rotating speed of the branch range hood 12, the required total pressure rise (Pt _ yanji) of each branch range hood 12 can be obtained ₁ 、Pt_yanji ₂ …Pt_yanji _M ) The minimum value of the total pressure rise (Pt _ yanji) is found _j ) The layer j and the preset air quantity Q of the layer _j . Finding the line satisfying Q in the calibrated aerodynamic characteristic line (formula 1) of the range hood _j Minimum required speed N _ yanji _j Set to the layer rotation speed. Then, the real total pressure rise of the layer (jth layer) of the range hood outlet is obtained by the formula 1 and is marked as Pt _ yanji _ real _j The corrected value of the system pressure Δ p is

Δp＝Pt_yanji_real _j －Pt_yanji _j (formula 13)

And then, correcting the total pressure rise required by each layer of branch range hood 12 and the static pressure rise required by the top end fan 20:

Pt_yanji_real _i ＝Pt_yanji _i + Δ p (formula 14)

Ps _ dingduan _ real = Ps _ X + Δ p (formula 15)

And then, utilizing the corrected real total pressure rise Pt _ yanji _ real of each layer of branch range hood 12 _i With preset air quantity Q of each layer _i Calculating the fan rotating speed N _ yanji _ real of each layer of branch range hood 12 by the formula 1 _i (ii) a And calculating the rotating speed N _ dingduon _ real of the top end fan 20 by using the corrected real static pressure rise Ps _ dingduon _ real of the top end fan 20 and the air quantity Q _ total of the top end fan 20 through an equation 6.

In some embodiments, referring to fig. 5, step 109 includes:

step 117, calculating the total pressure of the common smoke exhaust pipeline 14 at the downstream of each branch outlet of the common smoke exhaust pipeline 14, the three-way confluence loss of the layer where the branch range hood 12 is located and the loss of the branch corrugated pipe 16 by using a control algorithm; 111

Step 119, calculating the total pressure rise required by the branch range hood 12 on the mth layer according to the total pressure of the common smoke exhaust pipeline 14 on the downstream of each branch outlet, the three-way confluence loss of the layer where the branch range hood 12 is located and the loss of the branch corrugated pipe 16; 113

Step 121, determining the layer with the minimum total pressure rise value in the calculated total pressure rise required by each layer of branch range hoods 12 and the required air quantity Q of the branch range hood 12 on the layer _j And determining the required air quantity Q in the preset aerodynamic characteristic relation of the range hood _j And setting the required rotating speed as the rotating speed of the branch range hood 12 where the total pressure rise minimum value is located. 115

Therefore, the rotating speed of the branch range hood 12 corresponding to the minimum value of the total pressure rise can be determined.

Specifically, the layer where the minimum total pressure rise is located may be the jth layer, the total pressure of the common smoke exhaust duct 14 downstream of each branch outlet may be Pt _ down, the total pressure of the common smoke exhaust duct 14 downstream of each branch outlet may be calculated by using the above equations 10 and 11, and the total pressure Pt _ down of the common smoke exhaust duct 14 downstream of each branch outlet includes the total pressure Pt _ down of the top branch outlet downstream _M And the total pressure Pt _ down at the downstream of the branch outlet of the mth layer except the top layer _m 。

The pneumatic characteristic relationship may be a pneumatic characteristic line, which may be determined by the above equation 1, and the pneumatic characteristic line represents a corresponding relationship between the total pressure rise of the branch range hood 12 and the rotation speed and the air volume.

In one embodiment, the air quantity Q meeting the requirement is determined in a preset aerodynamic characteristic relation of the range hood _j The required rotational speed is the lowest rotational speed. In this way, the noise of the branch range hood 12 can be further optimized. Specifically, the rotation speed of the branch range hood 12 may be the lowest rotation speed in the case of satisfying the required air volume.

It can be understood that, in other embodiments, the rotation speed of the branch range hood 12 corresponding to the minimum total pressure rise value may randomly obtain one rotation speed or a smaller rotation speed in the pneumatic characteristic relationship.

In some embodiments, the total pressure rise required by the mth layer branch range hood 12 is obtained by subtracting the three-way confluence loss of the mth layer and the branch corrugated pipe 16 loss from the total pressure of the common smoke exhaust pipe 14 downstream of the mth layer branch outlet. Therefore, the method for calculating the total pressure rise required by the m-th layer branch range hood 12 is simple.

Specifically, the total pressure rise required by the mth layer branch range hood 12 may be Pt _ yanji _m The total pressure of the common flue gas duct 14 downstream of the mth layer branch outlet may be Pt _ _m The total pressure rise Pt _ yanji required by the mth layer branch range hood 12 can be calculated by the above formula 12 _m 。

In certain embodiments, the total pressure of the common flue gas duct 14 downstream of each leg outlet comprises the top leg outlet downstream total pressure and the mth leg outlet downstream total pressure except for the top stage,

step 117 comprises:

calculating the downstream total pressure of the top layer branch outlet according to the total pressure at the inlet of the top fan 20 and the on-way loss of the downstream of the top layer branch outlet to the inlet of the top fan 20;

and calculating to obtain the total downstream pressure of the outlet of the mth layer of branch according to the total downstream pressure of the outlet of the mth +1 layer of branch, the on-way loss from the downstream of the outlet of the mth layer of branch to the upstream of the outlet of the mth +1 layer of branch in the common smoke exhaust pipeline 14 and the main flow direct current loss of the (m + 1) th layer of branch. Thus, the total pressure of the common flue gas duct 14 downstream of each branch outlet is calculated.

Specifically, the top leg outlet downstream total pressure may be Pt _ down _M The total pressure at the inlet of the tip blower 20 may be Pt _ dingduan, and the on-way loss downstream of the top (Mth) leg outlet to the inlet of the tip blower 20 may be Pt _ dingduan

Top layer branch outlet downstream total pressure Pt _ down _M Can be calculated by equation 10.

The total pressure at the downstream of the m-th layer branch outlet can be Pt _ down _m The total pressure downstream of the outlet of the branch at the (m + 1) th layer may be Pt_ _m+1 The on-way loss from the m-th level branch outlet to the m + 1-th level branch outlet in the common flue gas exhaust duct 14 may be

The mainstream DC loss of the (m + 1) th layer can be

Total pressure Pt _ down at outlet downstream of branch at mth layer _m Can be calculated by equation 11 above. V may be determined in a manner similar to the V _ fan calculation.

In some embodiments, referring to fig. 6, the control method includes:

step 123, calculating the real total pressure rise of the outlet of the branch range hood 12 on the layer where the minimum total pressure rise is located and a system pressure correction value according to the rotating speed and the required air volume of the branch range hood 12 on the layer where the minimum total pressure rise is located;

step 125, correcting the total pressure rise required by the branch range hood 12 and the static pressure rise required by the top end fan 20 except for the layer where the minimum total pressure rise value is located according to the system pressure correction value;

127, according to the corrected total pressure rise required by each layer of branch line range hood 12 and the air quantity Q required by each layer _i Calculating the rotating speed N _ yanji _ real of each layer of branch range hood 12 _i And calculating the rotating speed N _ dingduon _ real of the top end fan 20 by using the corrected required static pressure rise Ps _ dingduon _ real of the top end fan 20 and the air volume of the top end fan 20. In this way, the rotation speeds of the branch range hood 12 and the top end fan 20 of other layers can be determined.

Specifically, the layer where the minimum total pressure rise value is located may be the jth layer, after the rotation speed (for example, the lowest rotation speed) of the jth layer branch range hood 12 corresponding to the minimum total pressure rise value is determined, the real total pressure rise of the outlet of the jth layer branch range hood 12 may be further determined, and the real total pressure rise of the outlet of the jth layer branch range hood 12 may be Pt _ yanji _ real _j Pt _ yanji _ real is determined by equation 1 _j . The system pressure correction value Δ p can be determined by equation 13.

The total pressure rise (real total pressure rise) required by each layer of branch range hood 12 can be Pt _ yanji _ real _i Pt _ yanji _ real can be determined by equation 14 _i . Static pressure required by the top fan 20The rise (real total pressure rise) may be Ps _ dingduan _ real, which may be determined by equation 15.

Utilizing the corrected real total pressure rise Pt _ yanji _ real of each layer of branch range hood 12 _i The required air quantity Q of each layer _i Calculating the fan rotating speed N _ yanji _ real of each layer of branch range hood 12 by the formula 1 _i And obtaining the rotating speed N _ dingduo _ real of the top end fan 20 by using the corrected real static pressure rise Ps _ dingduo _ real of the top end fan 20 and the air quantity Q _ total of the top end fan 20 through an equation 6, and transmitting the corresponding rotating speed to the branch range hood 12 and the top end fan 20, so that the branch range hood 12 and the top end fan 20 operate at the transmitted rotating speed.

In one embodiment, the rotating speed of the j-th branch range hood 12 corresponding to the minimum value of the total pressure rise is determined to be the lowest rotating speed, and the rotating speeds of other branch range hoods 12 required by meeting the required air volume are also the lowest rotating speeds, so that the noise and the power consumption of the branch range hoods 12 are optimized.

In some embodiments, the physical parameters include a first relation between total pressure rise and rotation speed of the range hood and air volume, a second relation between required air volume of the range hood and gears, a third relation between resistance coefficient of the corrugated pipe 16 and air volume, a first distance between an outlet of the top branch and an inlet of the top fan 20, and a second distance between an outlet of the mth branch and an outlet of the (m + 1) th branch, and the first relation, the second relation, the third relation, the first distance and the second distance are parameters related to 12 models of branch range hoods. Therefore, when the model of the branch-circuit range hood 12 is changed, the relevant physical parameters can be obtained, and accurate control can be realized.

Specifically, when the model of the branch range hood 12 is changed, the following four types of physical parameters in the control algorithm depend on the model of the branch range hood 12, and therefore, the four types of physical parameters can be updated through data interaction between the host 22 and the server 24:

a) The first relation (formula 1) between the total pressure rise of the range hood and the rotating speed and between the total pressure rise of the range hood and the air volume;

b) A second relation between the required air quantity Q of the range hood and the gear;

c) Third relation ξ _ b = F between resistance coefficient of bellows 16 and air volume ₂ (Q)

d) A first distance L between the top layer (Mth layer) branch outlet and the top end fan 20 inlet _M And a second distance L between the mth layer and the (m + 1) th layer branch outlet _m 。

In other embodiments, the central range hood system 100 may omit the top end fan 20, and therefore, ps _ X =0, so that the real total pressure rise Pt _ yanji _ real of each branch range hood 12 can be directly calculated by equations 9-12, and the fan rotation speed N _ yanji _ real of each branch range hood 12 can be obtained according to equation 1. Thus, a low cost, simple control of the central cigarette maker system 100 may be achieved. But the scheme can not optimize the lowest rotating speed of the branch range hood 12. It is noted that this solution may be used as a backup emergency solution when the top end fan 20 of the original solution fails or the top end fan 20 is repaired.

In some embodiments, a control method comprises:

when the branch range hood 12 is opened, the electric control valve 18 is controlled to be opened in a linkage mode, and the electric control valve 18 is connected with the branch range hood 12 and the side wall of the public smoke exhaust pipeline 14. Thus, the oil smoke can be prevented from flowing backwards.

Specifically, when the branch range hood 12 is started, the electric control valve 18 is opened in a linkage manner, so that the opened branch range hood 12 can smoothly discharge smoke, and the branch range hood 12 which is not opened can prevent the smoke in the common flue from flowing backwards to a kitchen where the branch range hood 12 is located.

In one embodiment, the electrically controlled valve 18 has two states, ON/OFF (fully open/fully closed), in which the valve plate of the electrically controlled valve 18 fully opens the bypass, and OFF, in which the valve plate of the electrically controlled valve 18 fully closes the bypass. In one embodiment, the opening angle of the valve plate of the electronic control valve 18 is adjustable, and besides the two states of ON/OFF (full open/full close), the valve plate is in at least one intermediate state between the two states of ON/OFF (full open/full close), and in the intermediate state, the valve plate of the electronic control valve 18 can be in any position between the two positions of full open and full close.

Specifically, the opening angle of the valve plate of the electronic control valve 18 is adjustable, and data communication can be performed between the electronic control valve 18 and the host 22. In the scheme that the electric control valve 18 only has two states of ON/OFF (fully opened/fully closed), the calculated working rotating speed may exceed the working range of the branch range hood 12 under some part of extreme working conditions. The opening angle of the valve plate of the electric control valve 18 can be adjusted, so that the air quantity distribution can be assisted by adjusting the opening angle of the valve plate of the electric control valve 18 under the extreme working conditions. Accordingly, in the present embodiment, the influence of the valve plate opening angle on the pneumatic characteristics of the tee joint needs to be considered in the pneumatic calibration and control algorithm of the tee joint, in which case the tee joint resistance characteristic of the system is determined by two values of the air volume ratio (Q/Qmain) of the branch and the common smoke exhaust pipeline 14 and the valve plate opening angle (θ), that is, formula 3 and formula 4 are respectively replaced by formula 18 and formula 19.

ξ_con＝F ₃ (Q/Q _ main, theta) (formula 18)

ξ_dir＝F ₄ (Q/Q _ main, theta) (formula 19)

Therefore, the central cigarette machine system 100 of the present embodiment can expand the applicable operating condition range.

In other embodiments, the electrically controlled valve 18 is replaced with a conventional passive stack check valve. In the scheme, the influence of branch air volume on the pneumatic characteristic of the tee joint needs to be additionally considered in the pneumatic characteristic calibration and control algorithm of the tee joint, and the tee joint resistance characteristic of the system is determined by two values of 14 air volume ratio (Q/Q _ mean) of the branch and the common smoke exhaust pipeline and branch air volume (Q) together, namely, formula 3 and formula 4 are replaced by formula 16 and formula 17 respectively.

ξ_con＝F ₃ (Q/Q _ main, Q) (formula 16)

ξ_dir＝F ₄ (Q/Q _ main, Q) (formula 17)

Therefore, the calibration work and the control algorithm are performed in this case. The advantage of this solution is a lower system cost.

In some embodiments, a control method comprises:

acquiring the installation position information of the branch-circuit range hood 12;

and adjusting parameters related to the mounting position of the branch-circuit range hood 12 in the control algorithm according to the mounting position information.

Specifically, in actual use scenarios, the branch range hood 12The installation position of the branch-circuit range hood 12 may be different from the default position, so that after the installation position of the branch-circuit range hood 12 is changed, a user can report the installation position information. Specifically, the installation position information of the branch-circuit range hood 12 can be reported to the server 24 or the local branch-circuit range hood 12 in a user-defined manner, and then the installation position information is sent to the host 22 through data communication between the server 24 or the local branch-circuit range hood 12 and the host 22. The host 22 adjusts corresponding parameters in the control algorithm according to the user-defined installation position, such as the relation ξ _ b = F between the resistance coefficient of the corrugated pipe 16 and the air volume ₂ A first distance L between the outlet of the branch (Q) and the inlet of the top layer (Mth layer) and the top end fan 20 _M A second distance L between the mth layer and the branch outlet of the (m + 1) th layer _m 。

After the installation position is changed, the first distance and the second distance may be measured by the user and reported to the server 24 or the local branch range hood 12. The user measures the horizontal distance and the vertical distance between the smoke outlet of the branch-circuit range hood 12 and the interface of the public smoke exhaust pipeline 14, and reports the distance to the server 24 or the local branch-circuit range hood 12, and the host 22 can determine the relationship between the resistance coefficient of the corrugated pipe 16 and the air volume according to the horizontal distance and the vertical distance.

In summary, the control method of the central cigarette making machine system 100 according to the embodiment of the present invention has the following innovation points:

(1) a control algorithm is built based on a one-dimensional aerodynamic model of the smoke exhaust system:

three-dimensional flow of the smoke exhaust system is simplified into a one-dimensional pneumatic system through dimension reduction, so that the calculation efficiency is greatly improved while the air volume control precision is ensured, and quick response can be realized; meanwhile, in the aerodynamic force calibration performance of the one-dimensional aerodynamic system, the system is disassembled into a plurality of mutually independent components for aerodynamic performance calibration.

(2) And (3) adopting an open-loop control strategy:

because the smoke exhaust system has high oil smoke concentration, the sensor is easy to be polluted, and the control failure is caused. The system reliability of the closed-loop control based on the sensor is poor and the system cost and the maintenance cost are high. The invention adopts an open-loop control strategy, fundamentally avoids the problem of control failure, and has more advantages in system cost and maintenance cost.

(3) The lowest optimization of 12 rotating speeds of the branch-circuit range hood can be realized:

the control algorithm provides the function of optimizing the additional limited condition while ensuring the air quantity required by the user side, and can support the optimization of the rotating speed of the fan of the branch-circuit range hood 12 and realize the purpose of reducing the noise of the user side.

(4) Can be compatible with the range hoods of various models:

corresponding parameters in a control algorithm can be automatically modified according to different models of the branch-circuit range hood 12, compatibility of various models of range hoods is achieved, and users can independently select the models of the range hoods according to use habits and personal preferences.

(5) Based on the gear and the model of the range hood, the air quantity of the user side is given, and the good matching of the gear and the oil fume absorption effect is realized:

because the smoke collecting cover structure influences the oil fume absorption effect, the invention considers the influence of the model of the range hood on the matching relation between the oil fume absorption effect and the required air volume, and realizes good correspondence between the gear and the oil fume absorption effect.

(6) The local database only stores the necessary range hood physical parameters, the necessary range hood physical parameters are automatically updated by data interaction of the host computer 22 and the server 24, and the maintenance cost of software and hardware updating is lower on the basis of ensuring the local response speed.

The control method of the central cigarette making machine system 100 of the embodiment of the invention can at least realize the following technical effects:

(1) the flow of the public smoke exhaust system is simplified into a one-dimensional pneumatic model, the calculation efficiency of a control algorithm is high, and the single calculation time of a single chip microcomputer is in the ms level; supporting users to replace the branch range hood 12;

(2) an open-loop control strategy is adopted, an additional sensor is not needed, the system cost and the maintenance cost are low, and the system reliability is high;

(3) optimization can be carried out according to the principle that the rotating speed of the branch-circuit range hood 12 is the lowest, and the noise of a user side is greatly reduced on the basis of meeting the air quantity required by the user side;

(4) the range hood can be compatible with various models of range hoods;

(5) the branch range hood 12 air volume is given based on the gear and the range hood model, so that the gear is well matched with the oil smoke absorption effect;

Referring to fig. 7, a control device 200 of a central cigarette making machine system 100 according to an embodiment of the present invention includes a processor 28 and a memory 30, the memory 30 stores a computer program, and the computer program realizes the steps of the control method according to any one of the above embodiments when executed by the processor 28.

Specifically, the control device 200 may include a host 22, and the control device 200 may be installed at a suitable location in the building to facilitate maintenance by the relevant personnel.

Referring to fig. 7, a central cigarette maker system 100 according to an embodiment of the present invention includes a control device 200 according to the above embodiment.

Embodiments of the present invention provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the control method of any of the above embodiments.

It should be noted that the explanation of the control method and the advantageous effects of the above embodiments also applies to the control device 200, the central cigarette machine system 100 and the computer-readable storage medium used in the embodiments of the present invention, and will not be described in detail herein to avoid redundancy.

In one embodiment, the computer program, when executed by the processor 28, implements a method of controlling comprising:

The control device 200, the central range hood system 100 and the computer readable storage medium can acquire physical parameters of all opened branch range hoods 12 through the local database and/or the server 24, and correspondingly adjust the control algorithm to acquire the required rotating speed, so that even if a user changes the model of the range hood, the control method can accurately control the branch range hood 12 to operate, and the user experience is improved.

It will be appreciated that the computer program comprises computer program code. The computer program code may be in the form of source code, object code, an executable file or some intermediate form, and the like. The computer-readable storage medium may include: any entity or device capable of carrying computer program code, recording medium, U-disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), software distribution medium, and the like. The Processor may be a central processing unit, or may be other general-purpose Processor, digital Signal Processor (DSP), application Specific Integrated Circuit (ASIC), field-Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like.

In the description of the present specification, reference to the description of "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method of controlling a central range hood system, comprising:

obtaining model information and gear information of all opened branch smoke ventilators, wherein the branch smoke ventilators are connected with a common smoke exhaust pipeline;

2. The control method according to claim 1, wherein obtaining physical parameters of all opened branch range hoods through a local database and/or a server according to the model information of the branch range hoods comprises:

matching the models of the branch line range hoods by using the stored range hood models of the local database;

under the condition that the model successfully matched exists, determining physical parameters of the branch-circuit range hood according to the local database;

3. The control method according to claim 1, wherein obtaining physical parameters of all opened branch range hoods through a local database and/or a server according to the model information of the branch range hoods comprises:

4. The control method according to claim 3, characterized by comprising:

5. The control method according to claim 1, characterized by further comprising:

6. The control method according to claim 5, wherein calculating the rotation speed required to satisfy the required air volume using the control algorithm includes:

calculating the total pressure of the public smoke exhaust pipeline at the downstream of each branch outlet of the public smoke exhaust pipeline, the three-way confluence loss and the branch corrugated pipe loss of the layer where the branch range hood is located by using the control algorithm;

7. The control method according to claim 6, characterized in that the rotating speed required for meeting the required air volume is determined as the lowest rotating speed in a preset aerodynamic characteristic relationship of the range hood.

8. The control method according to claim 6, wherein the common flue gas duct total pressure downstream of each branch outlet includes a top tier branch outlet downstream total pressure and an mth tier branch outlet downstream total pressure other than the top tier,

9. The control method according to claim 6, wherein the total pressure rise required by the mth layer branch range hood is obtained by subtracting the three-way confluence loss of the mth layer from the total pressure of the common smoke exhaust pipeline downstream of the mth layer branch outlet and the branch corrugated pipe loss.

10. The control method according to claim 6, characterized by comprising:

according to the system pressure correction value, correcting the total pressure rise required by each layer of branch range hoods except the layer where the minimum total pressure rise is located and the static pressure rise required by the top end fan;

11. The control method according to any one of claims 1 to 10, wherein the physical parameters include a first relation between total pressure rise and rotation speed of the range hood and air volume, a second relation between required air volume of the range hood and gear, a third relation between resistance coefficient of a corrugated pipe and air volume, a first distance between a top layer branch outlet and a top end fan inlet, and a second distance between an m layer branch outlet and an m +1 layer branch outlet, and the first relation, the second relation, the third relation, the first distance and the second distance are physical parameters related to the model of the branch range hood.

12. The control method according to claim 1, characterized by comprising:

13. The control method according to claim 1, characterized by comprising:

14. A control device for a central range hood system, comprising:

a processor; and

memory storing a computer program which, when executed by the processor, implements the steps of the control method of any one of claims 1-13.

15. A central tobacco machine system comprising the control device of claim 14.

16. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the control method according to any one of claims 1 to 13.