Control method, control device, system and storage medium of central range hood system

Abstract

The application discloses a kind of central fume machine system control method, control device, central fume machine system and computer readable storage medium.Control method of central fume machine system includes: obtaining the demand air volume of all opened branch set smoke hood, the branch set smoke hood is connected to public exhaust duct;Using preset control algorithm to calculate the target speed and target opening required to meet the demand air volume, and control the top fan to run at the target speed, control the branch electric control valve to run at the target opening, the branch electric control valve is connected to the branch set smoke hood and the public exhaust duct.The above-mentioned control method, in obtaining the demand air volume of each branch set smoke hood, and determining the target speed of top fan and the target opening of branch electric control valve according to this, and then realize the demand air volume of each branch set smoke hood, without multiple iteration calculation, save the computing resource and improve the calculation speed.

Description

Technical Field

[0001] This invention relates to the field of smoke exhaust equipment technology, and in particular to a control method, control device, central smoke exhaust system, and computer-readable storage medium for a central smoke exhaust system. Background Technology

[0002] In related technologies, central smoke control systems can be applied to buildings with shared smoke ducts. These systems include top-mounted fans installed at the outlet of the shared smoke duct and electrically controlled valves installed in the user smoke ducts. The central smoke control system can employ an open-loop control method to control the top-mounted fans and electrically controlled valves. However, current central smoke control systems rely on multiple iterations for optimization, resulting in high computational resource consumption and slow computation speed. Summary of the Invention

[0003] The present invention provides a control method, control device, central smoke machine system, and computer-readable storage medium for a central smoke machine system.

[0004] A control method for a central smoke machine system according to an embodiment of the present invention includes:

[0005] Obtain the required airflow of all activated branch smoke hoods, which are connected to the common exhaust duct.

[0006] The target speed and target opening degree required to meet the required air volume are calculated using a preset control algorithm, and the top fan is controlled to run at the target speed, and the branch solenoid valves are controlled to run at the target opening degree. The branch solenoid valves are connected to the branch smoke hoods and the common smoke exhaust duct.

[0007] The above control method obtains the required air volume of each branch smoke hood and determines the target speed of the top fan and the target opening of the branch electric control valve accordingly, thereby achieving the required air volume of each branch smoke hood. This eliminates the need for multiple iterative calculations, saving computational resources and improving calculation speed.

[0008] In some implementations, obtaining the required airflow for all open branch smoke hoods includes:

[0009] Get the gear position information of all activated branch smoke hoods;

[0010] Calculate the required airflow of the branch smoke hood based on its setting information.

[0011] In some implementations, obtaining the required airflow for all open branch smoke hoods includes:

[0012] Get the amount of cooking fumes on the floors where all the activated branch fume hoods are located;

[0013] Calculate the required airflow for the branch smoke collection hood based on the amount of oil fume.

[0014] In some implementations, calculating the target opening degree required to meet the demanded air volume using a preset control algorithm includes:

[0015] Set the opening degree of the electrically controlled valve on the U-th floor to a preset opening degree, where the U-th floor is the lowest floor where the opened branch smoke collection hood is located;

[0016] Calculate the total pressure downstream of the public exhaust duct at the tee junction of the U-th floor branch;

[0017] Based on the total downstream pressure of the public smoke exhaust pipe at the tee of the branch on the U-th floor, the opening degree of the electrically controlled valve on each floor is calculated sequentially from the U+1-th floor to the M-th floor, where the M-th floor is the top floor where the smoke collection hood of the branch is located.

[0018] When only the opening degree of the electrically controlled valve in the U-th layer is the preset opening degree, the calculated opening degree of each electrically controlled valve is used as the target opening degree of each branch electrically controlled valve.

[0019] Otherwise, the highest level where the opening degree of the electronically controlled valve is the preset opening degree is obtained, and denoted as the Jth level;

[0020] Obtain the total downstream pressure of the public exhaust pipe at the tee junction of the i-th branch, U<=i<=J;

[0021] Using the total pressure downstream of the public exhaust duct at the tee of the i-th branch, calculate the opening degree of the electrically controlled valve on the i-th floor and use the calculated opening degree of the electrically controlled valve on the i-th floor as the target opening degree of the electrically controlled valve of the branch on the i-th floor.

[0022] In some implementations, calculating the target rotational speed required to meet the demanded airflow using a preset control algorithm includes:

[0023] Obtain the total pressure downstream of the public smoke exhaust pipe at the tee of the branch road on the Mth layer, where the Mth layer is the top layer where the smoke collection hood of the branch road is located;

[0024] The required static pressure rise of the top fan is calculated based on the total pressure downstream of the public exhaust duct at the T-junction of the branch road on the Mth floor.

[0025] The target rotational speed of the top fan is determined based on the aerodynamic characteristics of the top fan and the required static pressure rise.

[0026] In some implementations, obtaining the total downstream pressure of the public exhaust duct at the tee of the Mth layer branch includes:

[0027] Calculate the total upstream pressure of the public smoke exhaust pipe at the tee junction of the i-th branch and the total downstream pressure of the public smoke exhaust pipe at the tee junction of the i-th branch until the total downstream pressure of the public smoke exhaust pipe at the tee junction of the M-th branch is obtained, where U <= i <= M.

[0028] In some implementations, calculating the required static pressure rise of the top fan based on the total downstream pressure of the common exhaust duct at the Mth layer branch tee includes:

[0029] Calculate the total pressure at the outlet of the public smoke exhaust pipe based on the total pressure downstream of the public smoke exhaust pipe at the tee junction of the branch road on the Mth floor.

[0030] The required static pressure rise of the top fan is calculated based on the total pressure at the outlet of the public smoke exhaust duct.

[0031] A control device for a central smoke machine system according to an embodiment of the present invention includes a processor and a memory. The memory stores a computer program, which, when executed by the processor, implements the steps of the control method for the central smoke machine system according to any of the above embodiments.

[0032] A central smoke machine system according to an embodiment of the present invention includes the control device of the central smoke machine system of the above embodiment.

[0033] This invention provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the control method for the central smoke machine system of any of the above embodiments.

[0034] The aforementioned control device, central smoke fan system, and computer-readable storage medium acquire the required air volume of each branch smoke hood and determine the target speed of the top fan and the target opening degree of the branch electric control valve accordingly, thereby achieving the required air volume of each branch smoke hood without multiple iterative calculations, saving computing resources and improving computing speed.

[0035] 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. Attached Figure Description

[0036] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0037] Figure 1 This is a flowchart illustrating the control method of the central smoke machine system according to an embodiment of the present invention;

[0038] Figure 2 This is an installation diagram of the central smoke machine system according to an embodiment of the present invention;

[0039] Figures 3 to 4 This is a flowchart illustrating the control method of the central smoke machine system according to an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of a one-dimensional pneumatic module of the central smoke machine system according to an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the pressure calculation of the one-dimensional pneumatic module of the central smoke machine system according to an embodiment of the present invention;

[0042] Figures 7 to 8 This is a flowchart illustrating the control method of the central smoke machine system according to an embodiment of the present invention;

[0043] Figure 9 This is a schematic diagram of the central smoke machine system according to an embodiment of the present invention;

[0044] Figure 10 This is a structural diagram of a traditional smoke extraction system for high-rise residential buildings in related technologies;

[0045] Figure 11 This is a schematic diagram of a centralized smoke collection hood system in related technologies;

[0046] Figure 12 This is a schematic diagram of a distributed central smoke collection hood system in related technologies. Detailed Implementation

[0047] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0048] In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0050] In this invention, unless otherwise expressly specified and limited, the first feature "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them.

[0051] This disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described herein. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0052] Currently, traditional smoke extraction systems in high-rise residential buildings consist of a public smoke extraction duct and branch lines at each user's end. For example... Figure 10 As shown, the branch lines consist of corrugated pipes, range hoods, and check valves. Fumes from the user end are discharged from the branch lines into the common exhaust duct, then flow upwards along the common exhaust duct and are discharged from the top. For lower-floor users, the exhaust resistance mainly comes from the common exhaust duct, including friction losses along the duct and merging losses when flowing through the exhaust vents of the branch lines of users on upper floors. Therefore, when there are many open floors, the exhaust resistance for lower-floor users is higher, the range hood's suction volume is insufficient, and the actual exhaust effect is poor. Although range hood technology is constantly iterating towards higher airflow and lower noise, in some actual use cases, extremely high exhaust resistance makes it impossible to simultaneously achieve both high airflow and low noise levels. At the same time, due to the significant difference in exhaust resistance between upper-floor and lower-floor users, an awkward situation arises where upper-floor users have excessive actual airflow while lower-floor users have insufficient actual airflow, resulting in poor exhaust performance for lower-floor users and energy waste for upper-floor users. In addition, to prevent backflow of grease from the public exhaust duct into the user's end, a passive flue check valve is usually installed at the interface between the user's branch and the public exhaust duct. When the user's range hood is off, the flue check valve is usually kept closed by the spring force and the weight of the valve plate, preventing grease from the public exhaust duct from flowing into the user's branch. When the user's range hood is on, the fluid discharged from the branch into the public exhaust duct overcomes the spring force and the weight of the valve plate, causing the valve plate to open. However, this type of passive check valve has the following disadvantages: ① When the airflow in the branch is low, the valve plate opening angle is too small, resulting in high exhaust resistance; ② Problems such as aging and failure of the flue check valve spring and grease buildup on the valve plate can affect the sealing performance when the valve plate is closed, leading to backflow of grease.

[0053] Therefore, the smoke extraction problem in high-rise residential buildings is a systemic issue that requires system-level control measures to solve. This is where central smoke extraction systems come in. Central smoke extraction systems typically use a top-mounted fan located at the outlet of the public smoke extraction duct as the main or sole power source. Based on the airflow demand from users, the main unit coordinates and controls the operating status of all components of the entire smoke extraction system in real time, meeting the smoke extraction needs of users under all operating conditions.

[0054] Based on the branch power distribution method, central smoke machine systems can be divided into two categories: centralized and distributed. Schematic diagrams of the two types of central smoke machine systems are shown below. Figure 11 and Figure 12 As shown. In a centralized central exhaust system, each branch has only a smoke collection hood, not a range hood. The entire system uses a top-mounted fan as its sole power source. At the interface between the branch and the common exhaust duct, a electrically controlled valve with an adjustable valve opening angle is installed. During system operation, the airflow distribution within the branch can be achieved by adjusting the valve opening angle. In a distributed central exhaust system, each branch has an adjustable-speed range hood. The entire system uses the top-mounted fan as the primary power source, with the branch range hoods serving as auxiliary power sources. At the branch outlet, a electrically controlled valve with an adjustable valve opening angle is installed. This check valve has only two states: ON / OFF (fully open / fully closed). During system operation, the airflow distribution within the branch can be achieved by adjusting the speed of the branch range hood. The switching of the electrically controlled valve can be linked to the switching of the terminal range hood. When the terminal range hood is on, the electrically controlled valve is in the ON state; when the terminal range hood is off, the electrically controlled valve is in the OFF state.

[0055] Due to differences in system components and operating mechanisms, the two types of central exhaust systems each have their own advantages. The advantages of a centralized central exhaust system are mainly reflected in the following aspects: the public exhaust duct is always under full negative pressure, which can strictly prevent oil fumes from flowing back into the user's kitchen from the public exhaust duct; since there are no exhaust fans in the branch circuits, the noise in the branch circuits is significantly reduced, with a reduction of up to 10dB; in addition, since there are no exhaust fans occupying space in the branch circuits of a centralized central exhaust system, the branch smoke collection hoods occupy a smaller size, and the shape design can be more flexible and aesthetically pleasing. The advantages of a distributed central exhaust fan system are mainly reflected in the following aspects: Because the branch check valves of a distributed central exhaust fan system always keep the system fully open when the branch is working, the system resistance is lower than that of a centralized system under the same operating conditions, thus the overall energy consumption level is also better than that of a centralized system; the branch exhaust fans of a distributed system can achieve the oil-fume separation function of traditional exhaust fans, and it is not easy for dirt to accumulate in the branch exhaust ducts; because the distributed central exhaust fan system has branch exhaust fans as auxiliary power sources, the operating parameters of the top fan are less demanding, and when the top fan fails, the exhaust function can still be achieved by relying on the branch exhaust fans, resulting in high system redundancy and high reliability.

[0056] However, regardless of whether it's a centralized or distributed central exhaust system, achieving efficient and accurate branch airflow distribution is the most critical issue. There are two main types of airflow distribution control methods: one is a closed-loop control system based on feedback control from pressure or flow sensors. However, due to severe oil fume pollution in the exhaust system, sensors are prone to failure, resulting in poor system reliability. Furthermore, the cost of the sensors themselves and subsequent maintenance is a real concern. The other type is an open-loop control method based on a one-dimensional aerodynamic model of the system, which offers lower cost and higher reliability in practical applications.

[0057] For centralized central smoke generator systems, open-loop control based on a one-dimensional aerodynamic model is an optimization problem. Existing technologies use multiple iterations to find the optimal solution, which suffers from high computational resource consumption, slow computation speed, and inability to find the optimal solution. Therefore, this invention proposes a centralized central smoke generator system and corresponding control method based on an open-loop control strategy, which can find the optimal solution for the system without multiple iterations.

[0058] Please refer to Figure 1 and Figure 2 A control method for a central smoke machine system 100 according to an embodiment of the present invention includes:

[0059] Step 101: Obtain the required air volume of all activated branch smoke hoods 12. The branch smoke hoods 12 are connected to the common smoke exhaust duct 14.

[0060] Step 103: Calculate the target speed and target opening required to meet the air volume demand using a preset control algorithm, and control the top fan 16 to run at the target speed and control the branch solenoid valve 18 to run at the target opening. The branch solenoid valve 18 is connected to the branch smoke hood 12 and the common smoke exhaust duct 14.

[0061] The above control method obtains the required air volume of each branch smoke hood 12 and determines the target speed of the top fan 16 and the target opening degree of the branch electric control valve 18 accordingly, thereby achieving the required air volume of each branch smoke hood 12. This eliminates the need for multiple iterative calculations, saving computational resources and improving computational speed.

[0062] Specifically, the central smoke-cooling system 100 in this embodiment of the invention can be a centralized central smoke-cooling system 100, such as... Figure 2As shown, the central smoke extraction system 100 includes: branch smoke hoods 12, bellows 20, branch electrically controlled valves 18, a common smoke exhaust duct 14, a top-mounted fan 16, and a main unit 22. The entire central smoke extraction system 100 is divided into two parts: the smoke exhaust duct and the control system. The smoke exhaust duct includes a branch smoke hood 12 outlet connected to one end of the bellows 20, and the other end of the bellows 20 connected to the electrically controlled valve. The branch smoke hoods 12, bellows 20, and branch electrically controlled valves 18 together form branches, and multiple branches are connected to the side wall of the common smoke exhaust duct 14. The upper outlet of the common smoke exhaust duct 14 is connected to the top-mounted fan 16. The valve plate of the branch electrically controlled valve 18 can be opened and closed by the drive of a motor, and the opening angle θ of the branch electrically controlled valve 18 is adjustable during operation. The control system includes: adjustable speed of top fan 16; data communication between main unit 22 and each branch electric control valve 18; data communication between main unit 22 and top fan 16; main unit 22 includes a control center capable of data reception, data processing and data transmission; and each branch electric control valve 18 can obtain user start-up status and gear information by communicating with the smoke collection hood 12 of that branch.

[0063] In some implementations, please refer to Figure 3 Step 101 includes:

[0064] Step 1011: Obtain the gear information of all activated branch smoke hoods 12;

[0065] Step 1013: Calculate the required air volume of the branch smoke hood 12 based on the gear information of the branch smoke hood 12.

[0066] In this way, the required air volume of the branch smoke hood 12 can be obtained.

[0067] Specifically, after the branch smoke hood 12 is opened, the branch solenoid valve 18 can send the following data information to the main unit 22: floor ID and the airflow level information for that floor. The main unit 22 sends the following data to the branch solenoid valve 18: the required opening angle of each branch solenoid valve 18. The main unit 22 sends the following data to the top fan 16: the rotational speed of the top fan 16. The correspondence between airflow level and airflow can be pre-calibrated and stored.

[0068] When a user opens a branch smoke hood 12, the branch solenoid valve 18 can obtain its gear position information through data communication with the branch smoke hood 12. The branch solenoid valve 18 then uploads this gear position information to the host 22. After collecting the gear position information of each branch smoke hood 12, the host 22 calculates the required speed of the top fan 16 and the required opening angle (degree of opening) of each branch solenoid valve 18 using a preset control algorithm. The host 22 sends the calculation results to the top fan 16 and each branch solenoid valve 18. The top fan 16 and each branch solenoid valve 18 adjust their speed and opening according to the information sent by the host 22, completing the control process. The switching of the solenoid valves can be linked to the switching of the branch smoke hoods 12. When the branch smoke hood 12 is open, the solenoid valve starts, acquiring the gear position information of the branch smoke hood 12; when the branch smoke hood 12 is closed, the solenoid valve closes.

[0069] In some implementations, please refer to Figure 4 Step 101 includes:

[0070] Step 1015: Obtain the amount of oil fume on the floors where all the activated branch smoke hoods 12 are located;

[0071] Step 1017: Calculate the required air volume of the branch smoke collection hood 12 based on the amount of oil fumes.

[0072] In this way, the required air volume of the branch smoke hood 12 can be obtained.

[0073] Specifically, a smoke sensor can be installed at the inlet of the branch solenoid valve 18 or inside the branch smoke hood 12 to monitor the amount of oil fumes at the terminal in real time and provide feedback to the main unit 22. The main unit 22 can set the required airflow of the branch smoke hood 12 according to the preset smoke volume-demand airflow matching relationship, without requiring the user to manually set the speed, thus achieving intelligent smoke extraction.

[0074] A core aspect of this invention is the control algorithm. This control algorithm can be pre-calibrated and stored, and it can find the optimal solution with the lowest system resistance while accurately meeting the airflow requirements of the system users. Under this optimal solution, the static pressure rise and power consumption required by the top fan 16 are minimized. The control algorithm is described below. This control algorithm is an open-loop control algorithm, which requires prior experimental calibration or empirical formula estimation of the aerodynamic characteristics of the system components.

[0075] The flow of the central smoke machine system 100 can be simplified to a one-dimensional aerodynamic model, such as... Figure 5 As shown in the diagram, the pressure calculation diagram for the one-dimensional aerodynamic model is as follows: Figure 6 As shown. In Figure 5The system is divided into the following components: branch smoke hood 12, corrugated pipe 20, tee 24, common smoke exhaust duct 14, and top fan 16. The tee 24 is the area formed by the branch's inlet to the common smoke exhaust duct 14 and the common smoke exhaust duct 14. When the flow from the branch flows into the common smoke exhaust duct 14 through this tee 24 area, a tee confluence loss occurs; when the flow from the common smoke exhaust duct 14 passes through this tee area, a tee direct flow loss occurs. The tee confluence loss coefficient ξ_con and the tee direct flow loss coefficient ξ_dir are jointly determined by the airflow ratio (Q / Q_main) of the branch to the common smoke exhaust duct 14 and the opening angle (θ) of the electrically controlled valve. The aerodynamic characteristics of each component can be estimated through experiments, simulations, or empirical formulas. The aerodynamic characteristics of each component are expressed as follows:

[0076] ΔPt = F1(Q) (Formula 1)

[0077] ξ_b = F2(Q) (Equation 2)

[0078] ξ_con = F3(θ,Q / Q_main) (Formula 3)

[0079] ξ_dir = F4(θ,Q / Q_main) (Formula 4)

[0080] λ = F5(Q_main) (Equation 5)

[0081] Ps_dingduan = F6(N_dingduan,Q_main(M)) (Equation 6)

[0082]

[0083] Where ΔPt is the total pressure rise of the branch smoke hood 12.

[0084] Q — Branch smoke hood 12 requires airflow

[0085] ξ_b — Corrugated pipe resistance coefficient 20

[0086] ξ_con —— Combination loss coefficient of branch tee 24

[0087] ξ_dir — Pressure loss coefficient of the main DC current at 24 branch tees

[0088] λ — Friction loss coefficient along public smoke exhaust duct 14

[0089] Q_main — Demand airflow for the combined public exhaust duct 14

[0090] Ps_dingduan——Top Fan 16 Static Pressure Rise

[0091] N_dingduan - Top fan 16 RPM

[0092] Q_main(i) — Total air demand of the public exhaust duct downstream of the i-th layer (14).

[0093] Q(i) — The required air volume of the branch smoke hood on the i-th layer.

[0094] M — Total number of floors

[0095] i——i-th layer

[0096] Among them, Figure 6 The symbols and physical meanings are shown in Table 1.

[0097] Table 1

[0098]

[0099]

[0100]

[0101] 1) The host 22 receives the gear position information of all currently open branch smoke hoods 12, and determines the required air volume Q(i) for each branch smoke hood 12 based on this gear position information. Then, the pressure value of each node in the branch of all open layers can be calculated according to the following formula:

[0102] Pt_in(i)=-ΔPt(i)=-F1(Q(i)) Equation 8;

[0103] Pt_branch(i)=Pt_in(i)-Δp_b(i) Equation 9;

[0104] Where Pt_in(i) is the total pressure at the outlet of the i-th layer of smoke collection hood;

[0105] Pt_branch(i)——Total inlet pressure of the check valve in the i-th branch;

[0106] Δp_b(i) — Pressure loss of the bellows in the i-th layer, Δp_b(i) = ξ_b(i) * 0.5 * ρ * V(i) 2 ;

[0107] V(i)——Average wind speed of the i-th branch, V(i)=Q(i) / S;

[0108] S—Cross-sectional area of ​​the branch exhaust duct (corrugated pipe 20);

[0109] ρ represents air density;

[0110] 2) Locate the lowest floor (floor U) of the opened branch smoke hood 12, set the opening angle of the electric control valve on floor U to the maximum opening angle, i.e., θ(U) = θmax, and calculate the downstream total pressure Pt_down(U) of the public smoke exhaust pipe 14 at the branch tee 24 on floor U according to the following formula:

[0111] Pt_down(U)=Pt_branch(U)-Δp_con(U) Equation 10;

[0112] Where Pt_down(i) represents the total downstream pressure of the public exhaust pipe at the 24th branch tee on the i-th floor;

[0113] Δp_con(i) — the pressure loss at the 24th branch merging point of the i-th branch tee, Δp_con(i) = ξ_con(i) * 0.5 * ρ * V_main(i) 2 ;

[0114] V_main(i)——The average wind speed of the downstream mainstream at the outlet of the i-th branch, V_main(i)=Q_main(i) / S_main;

[0115] S_main——Cross-sectional area of ​​public smoke exhaust duct 14, in Equation 10, i=U.

[0116] 3) Calculate the opening angle θ(i) of each branch's electrically controlled valve 18 sequentially from the U+1 layer to the top layer (M layer). The specific method is as follows:

[0117] First, calculate the total upstream pressure Pt_up(i) of the public exhaust pipe 14 at the 24th tee of the i-th branch:

[0118] Pt_up(i)=Pt_down(i-1)-Δp_l(i-1) Equation 11;

[0119] Where Δp_l(i) is the pressure loss along the common smoke exhaust pipe 14 from the downstream of the i-th branch to the upstream of the i+1-th branch;

[0120] If the branch smoke hood 12 on the i-th floor is not open, then θ(i) = 0.

[0121] If the branch smoke hood 12 on the i-th floor is already open, then determine whether Pt_up(i) - Δp_dir(i) > Pt_branch(i) - Δp_con(i) when θ(i) = θmax (i.e., when the opening of the electric control valve on the i-th floor is at its maximum, θmax is the maximum opening of the electric control valve):

[0122] If so, then solve the unique unknown θ(i) in the following equation:

[0123] Pt_up(i)-F4(θ(i),Q(i) / Q_main(i))*0.5*ρ*V_main(i) 2 =

[0124] Pt_branch(i)-F3(θ(i),Q(i) / Q_main(i))*0.5*ρ*V_main(i) 2 Equation 12;

[0125] If not, then set θ(i) = θmax.

[0126] 4) The total downstream pressure Pt_down(i) of the public exhaust pipe 14 at the 24th branch tee on the i-th floor is obtained by the following formula:

[0127] Pt_down(i)=Pt_branch(i)-Δp_con(i) Equation 13;

[0128] 5) Repeat steps 3) and 4) above until the top layer (the Mth layer), and calculate the total downstream pressure Pt_down(M) of the public exhaust pipe 14 at the 24 tees of the top layer branch.

[0129] 6) Calculate the total pressure Pt_out at the outlet of the public smoke exhaust duct 14 (i.e., the inlet of the top fan 16) and the required static pressure rise Ps_dingduan of the top fan 16 using the following formula.

[0130] Pt_out=Pt_down(M)–Δp_l(M) Equation 14;

[0131] Ps_dingduan=0.5*ρV_main(N) 2 –Pt_out formula 15;

[0132] 7) Based on the aerodynamic characteristic formula of the top fan 16, calculate the required rotational speed N_dingduan_real of the top fan 16.

[0133] Ps_dingduan=F6(N_dingduan_real,Q_main(M)) Formula 16.

[0134] 8) Find the highest layer that satisfies θ(i) = θmax, and determine whether it is the lowest layer that has been enabled (layer U). If it is, output all θ(i) values ​​and complete the calculation. If not, find the highest layer that satisfies θ(i) = θmax, and denote it as layer J. Proceed to steps 9) and 10).

[0135] 9) Calculate and update the upstream total pressure Pt_up(J) of the public smoke exhaust pipe 14 at the 24th tee of the branch road on the Jth floor according to the following formula:

[0136] Pt_up(J) = Pt_down(J) + Δp_dir(J) Equation 17;

[0137] 10) Starting from layer J and moving towards the bottom layer (layer U) of the opened branch smoke hood 12, calculate and update the pressure values ​​and opening angles of the electrically controlled valves at each node sequentially. The total downstream pressure of the common smoke exhaust pipe 14 at the tee 24 of the layer i branch is:

[0138] Pt_down(i)=Pt_up(i+1)+Δp_l(i) Equation 18;

[0139] For the i-th layer, solve for the unique unknown θ(i) in the equation below.

[0140] Pt_down(i)=Pt_branch(i)-F3(θ(i),Q(i) / Q_main(i))*0.5*ρ*V_main(i) 2 Formula 19

[0141] Finally, output all θ(i) values ​​to complete the calculation.

[0142] In some implementations, please refer to Figure 7 The target opening required to meet the demand for air volume is calculated using a preset control algorithm, including:

[0143] Step 1031: Set the opening degree of the electrically controlled valve on the U-th floor to the preset opening degree. The U-th floor is the lowest floor where the opened branch smoke hood 12 is located.

[0144] Step 1033: Calculate the total pressure downstream of the public exhaust pipe 14 at the 24th branch tee on the U-th floor;

[0145] Step 1035: Based on the total pressure downstream of the public smoke exhaust pipe 14 at the branch tee 24 on the U-th floor, calculate the opening degree of the electrically controlled valve on each floor from the U+1 floor to the M-th floor. The M-th floor is the top floor where the branch smoke hood 12 is located.

[0146] Step 1037: When only the opening degree of the solenoid valve in the Uth layer is the preset opening degree, the calculated opening degree of each solenoid valve is used as the target opening degree of each branch solenoid valve 18.

[0147] Step 1039, otherwise, obtain the highest level where the opening degree of the electronically controlled valve is the preset opening degree, and record it as the Jth level;

[0148] Step 1041: Obtain the total pressure downstream of the public exhaust pipe 14 at the 24th branch tee on the i-th floor, U<=i<=J;

[0149] Step 1043: Using the total pressure downstream of the public exhaust pipe 14 at the tee 24 of the i-th branch, calculate the opening degree of the electrically controlled valve of the i-th layer and use the calculated opening degree of the electrically controlled valve of the i-th layer as the target opening degree of the electrically controlled valve of the i-th branch.

[0150] In this way, the target opening degree of each branch electronic control valve 18 can be obtained.

[0151] Specifically, the total downstream pressure of the public exhaust pipe 14 at the 24th branch tee of the Uth layer can be Pt_down(U), and the total downstream pressure Pt_down(U) of the public exhaust pipe 14 at the 24th branch tee of the Uth layer can be calculated using the above formula 10.

[0152] In one implementation, the preset opening degree can be the maximum opening degree θmax of the branch solenoid valve 18. After calculating the opening degrees of the solenoid valves from layer U+1 to layer M, it can be determined whether only the opening degree of the solenoid valve in layer U is the preset opening degree. If only the opening degree of the solenoid valve in layer U is the preset opening degree, the calculated opening degree of each solenoid valve can be used as the target opening degree of each branch solenoid valve 18 and sent to each branch solenoid valve 18, and each branch solenoid valve 18 operates according to the given target opening degree.

[0153] If the preset opening degree of the electrically controlled valve is not only found in layer U, the highest layer with the preset opening degree of the electrically controlled valve is obtained and denoted as layer J. The total downstream pressure Pt_down(i) of the common smoke exhaust duct 14 at branch tee 24 in layer i is obtained. Using the total downstream pressure Pt_down(i) of the common smoke exhaust duct 14 at branch tee 24 in layer i, the opening degree of the electrically controlled valve in layer i is calculated and used as the target opening degree of the branch electrically controlled valve 18 in layer i. The calculated opening degrees of each electrically controlled valve can be used as the target opening degree of each branch electrically controlled valve 18 and sent to each branch electrically controlled valve 18, which then operates according to the given target opening degree. That is, the target opening degrees of the branch electrically controlled valves 18 from layer J to layer U are recalculated.

[0154] The total downstream pressure of the public exhaust pipe 14 at the tee junction 24 on the i-th floor can be Pt_down(i), which can be calculated using Equation 18, i.e., Pt_down(i) = Pt_up(i+1) + Δp_l(i). In Equation 18, Pt_up(i+1) can be calculated using Equation 17, i.e., Pt_up(i+1) = Pt_down(i+1) + Δp_dir(i+1). In Equation 17, Pt_down(i+1) can be calculated using Equation 13, i.e., Pt_down(i+1) = Pt_branch(i+1) - Δp_con(i+1).

[0155] It is understood that in other embodiments, the preset opening degree may also be other opening degrees of the branch solenoid valve 18, and is not limited to the maximum opening degree.

[0156] In some implementations, please refer to Figure 8 The target rotational speed required to meet the demand for airflow, calculated using control algorithms, includes:

[0157] Step 1045: Obtain the total pressure downstream of the public smoke exhaust pipe 14 at the 24th branch tee on the Mth layer. The Mth layer is the top layer where the branch smoke hood 12 is located.

[0158] Step 1047: Calculate the required static pressure rise of the top fan 16 based on the total pressure downstream of the public smoke exhaust pipe 14 at the 24th branch tee of the Mth layer;

[0159] Step 1049: Determine the target rotational speed of the top fan 16 based on its aerodynamic characteristics and the required static pressure rise.

[0160] In this way, the target rotational speed of the top fan 16 can be determined.

[0161] Specifically, the aerodynamic characteristics of the top fan 16 can be a relational expression, a curve, or a surface. The aerodynamic characteristics of the top fan 16 can be pre-tested, simulated, calibrated, and stored. Combining the aerodynamic characteristics of the top fan 16 and the required static pressure rise, the target rotational speed of the top fan 16 can be calculated.

[0162] In some implementations, step 1045 includes:

[0163] Calculate the total upstream pressure of the public smoke exhaust pipe 14 at the tee junction 24 of the i-th branch and the total downstream pressure of the public smoke exhaust pipe 14 at the tee junction 24 of the i-th branch until the total downstream pressure of the public smoke exhaust pipe 14 at the tee junction 24 of the M-th branch is obtained, where U <= i <= M.

[0164] Thus, the total downstream pressure of the public exhaust pipe 14 at the 24th branch tee of the Mth layer can be calculated.

[0165] Specifically, the total downstream pressure of the public smoke exhaust pipe 14 at the branch tee 24 of the Mth (top) level can be Pt_down(M), which can be calculated using the above formulas 11 and 13.

[0166] In some implementations, step 1047 includes:

[0167] Calculate the total pressure at the outlet of public smoke exhaust pipe 14 based on the total pressure downstream of the 24th branch tee on the Mth layer;

[0168] The required static pressure rise of the top fan 16 is calculated based on the total pressure at the outlet of the public smoke exhaust duct 14.

[0169] Thus, the required static pressure rise of the top fan 16 can be calculated.

[0170] Specifically, the total pressure at the outlet of the public smoke exhaust duct 14 can be Pt_out, which can be calculated using Equation 14. The required static pressure rise of the top fan 16 can be Ps_dingduan, which can be calculated using Equation 15.

[0171] Please refer to Figure 9 According to an embodiment of the present invention, a control device 200 for a central smoke machine system 100 includes a processor 26 and a memory 28. The memory 28 stores a computer program, which, when executed by the processor 26, implements the steps of the control method for the central smoke machine system 100 of any of the above embodiments.

[0172] Specifically, the control device 200 may include a host 22, and the control device 200 may be installed in a suitable location in the building for convenient maintenance by relevant personnel.

[0173] Please refer to Figure 9 A central smoke machine system 100 according to an embodiment of the present invention includes a control device 200 of the central smoke machine system 100 of the above embodiment.

[0174] This invention provides a computer-readable storage medium storing a computer program thereon. When executed by a processor 26, the computer program implements the steps of the control method of the central smoke machine system 100 of any of the above embodiments.

[0175] It should be noted that the explanation of the control method and beneficial effects of the above embodiments also applies to the control device 200, the central smoke machine system 100, and the computer-readable storage medium of the embodiments of the present invention. To avoid redundancy, they will not be elaborated in detail here.

[0176] In one implementation, the control method implemented by the computer program when executed by the processor 2628 includes the following steps:

[0177] Step 101: Obtain the required air volume of all activated branch smoke hoods 12. The branch smoke hoods 12 are connected to the common smoke exhaust duct 14.

[0178] Step 103: Calculate the target speed and target opening required to meet the air volume demand using a preset control algorithm, and control the top fan 16 to run at the target speed and control the branch solenoid valve 18 to run at the target opening. The branch solenoid valve 18 is connected to the branch smoke hood 12 and the common smoke exhaust duct 14.

[0179] The aforementioned control device 200, central smoke machine system 100, and computer-readable storage medium acquire the required air volume of each branch smoke hood 12, and determine the target speed of the top fan 16 and the target opening degree of the branch electric control valve 18 accordingly, thereby achieving the required air volume of each branch smoke hood 12 without multiple iterative calculations, saving computing resources and improving computing speed.

[0180] It is understood that a computer program includes computer program code. Computer program code can be in the form of source code, object code, executable files, or certain intermediate forms. Computer-readable storage media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, external hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution media, etc. The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0181] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0182] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these 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 control method for a central smoke machine system, characterized in that, include: Obtain the required airflow of all activated branch smoke hoods, which are connected to the common exhaust duct. The target speed and target opening degree required to meet the required air volume are calculated using a preset control algorithm, and the top fan is controlled to run at the target speed, and the branch solenoid valve is controlled to run at the target opening degree. The branch solenoid valve is connected to the branch smoke hood and the common smoke exhaust duct. The target opening degree required to meet the demanded air volume is calculated using a preset control algorithm, including: Set the opening degree of the electrically controlled valve on the U-th floor to a preset opening degree, where the U-th floor is the lowest floor where the opened branch smoke collection hood is located; Calculate the total pressure downstream of the public exhaust duct at the tee junction of the U-th floor branch; Based on the total downstream pressure of the public smoke exhaust pipe at the tee of the branch on the U-th floor, the opening degree of the electrically controlled valve on each floor is calculated sequentially from the U+1-th floor to the M-th floor, where the M-th floor is the top floor where the smoke collection hood of the branch is located. When only the opening degree of the electrically controlled valve in the U-th layer is the preset opening degree, the calculated opening degree of each electrically controlled valve is used as the target opening degree of each branch electrically controlled valve. Otherwise, the highest level where the opening degree of the electronically controlled valve is the preset opening degree is obtained, and denoted as the Jth level; Get the total pressure downstream of the public smoke exhaust pipe at the tee junction of the i-th branch, U<=i<=J; Using the total pressure downstream of the public exhaust duct at the tee of the i-th branch, calculate the opening degree of the electrically controlled valve on the i-th floor and use the calculated opening degree of the electrically controlled valve on the i-th floor as the target opening degree of the electrically controlled valve of the branch on the i-th floor.

2. The control method according to claim 1, characterized in that, To obtain the required airflow for all activated branch smoke hoods, the following is included: Get the gear position information of all activated branch smoke hoods; Calculate the required airflow of the branch smoke hood based on its setting information.

3. The control method according to claim 1, characterized in that, To obtain the required airflow for all activated branch smoke hoods, the following is included: Get the amount of cooking fumes on the floors where all the activated branch fume hoods are located; Calculate the required airflow for the branch smoke collection hood based on the amount of oil fume.

4. The control method according to claim 1, characterized in that, The target rotational speed required to meet the desired airflow volume is calculated using a preset control algorithm, including: Obtain the total pressure downstream of the public smoke exhaust pipe at the tee of the branch road on the Mth layer, where the Mth layer is the top layer where the smoke collection hood of the branch road is located; The required static pressure rise of the top fan is calculated based on the total pressure downstream of the public exhaust duct at the T-junction of the branch road on the Mth floor. The target rotational speed of the top fan is determined based on the aerodynamic characteristics of the top fan and the required static pressure rise.

5. The control method according to claim 4, characterized in that, The total downstream pressure of the public exhaust duct at the tee junction of the Mth branch includes: Calculate the total upstream pressure of the public smoke exhaust pipe at the tee junction of the i-th branch and the total downstream pressure of the public smoke exhaust pipe at the tee junction of the i-th branch until the total downstream pressure of the public smoke exhaust pipe at the tee junction of the M-th branch is obtained, U<=i<=M.

6. The control method according to claim 4, characterized in that, The required static pressure rise of the top fan is calculated based on the total pressure downstream of the public exhaust duct at the Mth layer branch tee, including: Calculate the total pressure at the outlet of the public smoke exhaust pipe based on the total pressure downstream of the public smoke exhaust pipe at the tee junction of the branch road on the Mth floor. The required static pressure rise of the top fan is calculated based on the total pressure at the outlet of the public smoke exhaust duct.

7. A control device for a central smoke machine system, characterized in that, include: processor; and A memory storing a computer program that, when executed by the processor, implements the steps of the control method for the central smoke machine system according to any one of claims 1-6.

8. A central smoke-making system, characterized in that, Includes the control device as described in claim 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the control method for the central smoke machine system according to any one of claims 1-6.

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