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.The control method of central fume machine system includes: obtaining the model information and gear information of all opened branch range hood, branch range hood connects public exhaust duct;According to the model information of branch range hood, the physical parameters of all opened branch range hood are obtained by local database and / or server;According to the physical parameters of branch range hood, adjust the aerodynamic parameter in control algorithm;According to the model information and gear information of branch range hood, the required air volume of branch range hood is calculated;The required speed to meet the required air volume is calculated using control algorithm, and the speed is sent to branch range hood to make branch range hood run according to speed.The above control method, even if user replaces range hood model, can more accurately control branch range hood operation, improve user experience.

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, a central range hood system can control the operation of each terminal range hood based on its model and installation location. However, due to usage habits or personal preferences, users may request to change the model of the terminal range hood. This can cause two problems: First, different models of terminal range hoods have different fan performance, which can lead to inaccuracies or even failures in the original control model and corresponding open-loop control algorithm. Second, different models of terminal range hoods have different smoke collection hood structures, so the air volume required to achieve the same smoke extraction effect is not the same. 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 model information and speed information of all activated branch range hoods, which are connected to the common exhaust duct;

[0006] Based on the model information of the branch range hoods, obtain the physical parameters of all activated branch range hoods through a local database and / or server;

[0007] The aerodynamic parameters in the control algorithm are adjusted according to the physical parameters of the branch range hood;

[0008] The required air volume of the branch range hood is calculated based on the model information and the speed setting information of the branch range hood.

[0009] The control algorithm is used to calculate the rotational speed required to meet the required air volume and the rotational speed is then adjusted to the branch range hood so that the branch range hood operates according to the rotational speed.

[0010] The above control method can obtain the physical parameters of all activated branch range hoods through a local database and / or server, and adjust the control algorithm accordingly to obtain the required speed. This allows for relatively accurate control of the branch range hoods even if the user changes the model of the range hood, thus improving the user experience.

[0011] In some implementations, based on the model information of the branch range hoods, obtaining the physical parameters of all activated branch range hoods through a local database and / or server includes:

[0012] The model of the branch range hood is matched with the model of the range hood already stored in the local database;

[0013] If a matching model exists, the physical parameters of the branch range hood are determined based on the local database;

[0014] If a model fails to match, the model that failed to match is sent to the server, and the physical parameters returned by the server are received.

[0015] In some implementations, based on the model information of the branch range hoods, obtaining the physical parameters of all activated branch range hoods through a local database and / or server includes:

[0016] Send the model numbers of all activated branch range hoods to the server, and receive the physical parameters of all activated branch range hoods returned by the server.

[0017] In some embodiments, the control method includes:

[0018] The physical parameters of the range hood stored in the local database are updated using the physical parameters returned by the server.

[0019] In some embodiments, the control method further includes:

[0020] The control algorithm is used to calculate the required rotational speed of the top fan and the required rotational speed is sent to the top fan so that the top fan operates according to the required rotational speed. The top fan is connected to the outlet of the common smoke exhaust duct.

[0021] In some implementations, calculating the rotational speed required to meet the demanded airflow using the control algorithm includes:

[0022] The control algorithm is used to calculate the total pressure of the public exhaust duct downstream of each branch outlet, the tee confluence loss of the branch range hood, and the branch corrugated pipe loss.

[0023] The total pressure rise required for the m-th branch range hood is calculated based on the total pressure of the common exhaust pipe downstream of each branch outlet, the tee confluence loss of the branch range hood on the floor where the branch range hood is located, and the branch corrugated pipe loss.

[0024] Determine the minimum total pressure rise of the branch range hoods on each floor from the calculated total pressure rise, as well as the required air volume of the branch range hoods on that floor. Then, determine the required rotation speed to meet the required air volume based on the preset aerodynamic characteristic relationship of the range hoods, and set the rotation speed as the rotation speed of the branch range hoods on the floor with the minimum total pressure rise.

[0025] In some implementations, the minimum rotational speed required to meet the required airflow is determined from a preset aerodynamic characteristic relationship of the range hood.

[0026] In some embodiments, the total pressure of the common exhaust duct downstream of each branch outlet includes the total pressure downstream of the top-level branch outlet and the total pressure downstream of the m-th layer branch outlet (excluding the top-level branch).

[0027] The total pressure of the public smoke exhaust duct downstream of each branch outlet, calculated using the aforementioned control algorithm, includes:

[0028] The total pressure downstream of the top branch outlet is calculated based on the total pressure at the top fan inlet and the friction loss from the top branch outlet downstream to the top fan inlet.

[0029] The total pressure downstream of the branch outlet of the m+1th layer is calculated based on the total pressure downstream of the branch outlet of the m+1th layer, the friction loss from the downstream of the branch outlet of the m+1th layer to the upstream of the branch outlet of the m+1th layer in the public smoke exhaust duct, and the mainstream DC loss of the m+1th layer.

[0030] In some implementations, the total pressure rise required by the range hood of the m-th branch is obtained by subtracting the tee confluence loss and the branch corrugated pipe loss from the total pressure of the common exhaust duct downstream of the outlet of the m-th branch.

[0031] In some embodiments, the control method includes:

[0032] Based on the rotation speed and required air volume of the range hoods on the floor with the minimum total pressure rise, calculate the actual total pressure rise at the outlet of the range hoods on the floor with the minimum total pressure rise, and the system pressure correction value.

[0033] Based on the system pressure correction value, correct the total pressure rise required by the range hoods on each floor branch except the floor with the minimum total pressure rise and the static pressure rise required by the top fan.

[0034] The rotational speed of each branch range hood is calculated based on the total pressure rise required by each branch range hood and the required air volume of each branch range hood obtained after correction. The rotational speed of the top fan is calculated using the static pressure rise required by the top fan and the air volume of the top fan obtained after correction.

[0035] In some embodiments, the physical parameters include a first relationship between the total pressure rise of the range hood and its rotation speed and air volume, a second relationship between the required air volume of the range hood and its speed setting, a third relationship between the corrugated pipe resistance coefficient and the air volume, a first distance between the top branch outlet and the top fan inlet, and a second distance between the m-th branch outlet and the (m+1)-th branch outlet. The first relationship, the second relationship, the third relationship, the first distance, and the second distance are physical parameters related to the model of the branch range hood.

[0036] In some embodiments, the control method includes:

[0037] After the branch range hood is turned on, the control valve is activated in conjunction with it. The control valve is connected to the branch range hood and the common exhaust duct.

[0038] In some embodiments, the control method includes:

[0039] Obtain the installation location information of the branch range hood;

[0040] The parameters related to the installation location of the branch range hood in the control algorithm are adjusted according to the installation location information.

[0041] A control device for a central tobacco 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 of any of the above embodiments.

[0042] A central smoke machine system according to an embodiment of the present invention includes the control device described in the above embodiment.

[0043] The present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the control method of any of the above embodiments.

[0044] The aforementioned control device, central range hood system, and computer-readable storage medium can obtain the physical parameters of all activated branch range hoods through a local database and / or server, and adjust the control algorithm accordingly to obtain the required speed. This allows for relatively accurate control of the branch range hoods even if the user changes the range hood model, thus improving the user experience.

[0045] 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

[0046] 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:

[0047] Figure 1 This is a flowchart illustrating the control method according to an embodiment of the present invention;

[0048] Figure 2 This is an installation diagram of the central smoke machine system according to an embodiment of the present invention;

[0049] Figure 3 This is a flowchart illustrating the control method according to an embodiment of the present invention;

[0050] Figure 4 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;

[0051] Figures 5 to 6 This is a flowchart illustrating the control method according to an embodiment of the present invention;

[0052] Figure 7 This is a schematic diagram of the central smoke machine system according to an embodiment of the present invention;

[0053] Figure 8 This is a structural diagram of a traditional smoke extraction system for high-rise residential buildings in related technologies;

[0054] Figure 9 This is a structural diagram of a centralized range hood system in related technologies;

[0055] Figure 10 This is a schematic diagram of the structure of a distributed central range hood system in related technologies. Detailed Implementation

[0056] 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.

[0057] In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] In related technologies, traditional smoke extraction systems for high-rise residential buildings consist of a common smoke extraction duct and branch lines at each user end. For example... Figure 8 As shown, cooking fumes from the user end are discharged from the branch exhaust duct to the public exhaust duct, then flow upwards along the public exhaust duct and are discharged from the top of the public exhaust duct. For lower-floor users, the exhaust resistance mainly comes from the public exhaust duct, including friction loss along the duct and merging loss when flowing through the exhaust vents of the branch exhaust vents of users on the upper floors. Therefore, when there are many open floors, the exhaust resistance of lower-floor users is higher, the range hood's suction volume is insufficient, and the actual exhaust effect is poor.

[0062] Although range hood technology continues to evolve towards higher airflow and lower noise levels, extremely high exhaust resistance in some practical applications makes it impossible to simultaneously achieve both. Furthermore, the significant difference in exhaust resistance between high-rise and low-rise users creates an awkward situation where high-rise users experience excessive airflow while low-rise users experience insufficient airflow, resulting in poor exhaust performance for low-rise users and energy waste for high-rise users. In addition, to prevent backflow of fumes from the public exhaust duct into individual user units, passive backflow check valves are typically installed at the interface between the user's branch exhaust and the public exhaust duct. When the branch range hood is off, the backflow check valve usually remains closed due to spring force and valve plate weight, preventing fumes from the public exhaust duct from flowing into the user's branch exhaust. When the branch range hood is on, the fluid discharged from the branch exhaust towards the public exhaust duct overcomes the spring force and valve plate weight, causing the valve to open. However, this type of passive check valve has the following disadvantages: ① When the branch air volume is low, the valve plate opening angle is too small, resulting in a large smoke exhaust resistance; ② Problems such as aging and failure of the flue check valve spring and oil fume adhesion on the valve plate will affect the sealing performance when the valve plate is closed, leading to backflow of oil fumes.

[0063] 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.

[0064] Based on the branch power distribution method, central smoke machine systems can be divided into two categories: centralized and distributed. Schematic diagrams of these two types of central smoke machine systems are shown below. Figure 9 and Figure 10 As shown.

[0065] Please refer to Figure 9 In a centralized central exhaust system, each branch has its own smoke collection hood, not a separate range hood. The entire system is powered solely by a top-mounted fan. At the interface between each branch and the common exhaust duct, an electrically controlled valve with an adjustable valve opening angle is installed. During system operation, the airflow distribution between branches can be adjusted by regulating the valve's opening angle.

[0066] Please refer to Figure 10 The distributed central range hood system has adjustable-speed range hoods in its branch circuits. The entire system uses the top-mounted fan as the main power source, with the branch range hoods serving as auxiliary power sources. Each branch outlet of the distributed central range hood system is equipped with an electrically controlled valve with an adjustable valve opening angle; this check valve has two states: ON / OFF (fully open / fully closed). During system operation, the airflow distribution in each branch circuit can be achieved by adjusting the speed of the branch range hoods.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] For distributed central range hood systems, all branch range hoods in related technologies are of the same model, and the one-dimensional aerodynamic model and corresponding open-loop control strategy are established under this condition. Furthermore, the terminal airflow is uniformly given according to the characteristics of the smoke collection hood of that model of range hood. However, for distributed central range hood systems, users may request to change the model of the terminal range hood due to usage habits or personal preferences. This may cause two problems: First, when changing the range hood model, differences in fan performance and branch corrugated pipe installation status can lead to inaccuracies or even failures in the original one-dimensional aerodynamic model and corresponding open-loop control algorithm. Second, different models of range hoods have different smoke collection hood structures, therefore the airflow required to achieve the same smoke extraction effect is not entirely the same. Based on this, this invention proposes a central range hood system compatible with multiple models of terminal range hoods and a corresponding control method, based on the open-loop control strategy.

[0071] 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:

[0072] Step 101: Obtain the model information and speed information of all activated branch range hoods 12. The branch range hoods 12 are connected to the common exhaust duct 14.

[0073] Step 103: Based on the model information of the branch range hood 12, obtain the physical parameters of all activated branch range hoods 12 through the local database and / or server 24.

[0074] Step 105: Adjust the corresponding aerodynamic parameters in the control algorithm according to the physical parameters of the branch range hood 12;

[0075] Step 107: Calculate the required air volume of the branch range hood 12 based on its model information and speed setting information;

[0076] Step 109: Calculate the required rotational speed to meet the demand for airflow using a control algorithm and send the rotational speed down to the branch range hood 12 so that the branch range hood 12 operates according to the rotational speed.

[0077] The above control method can obtain the physical parameters of all the activated branch range hoods 12 through the local database and / or server 24, and adjust the control algorithm accordingly to obtain the required speed. This ensures that even if the user changes the range hood model, the control method can accurately control the operation of the branch range hoods 12, thus improving the user experience.

[0078] Specifically, the central range hood system 100 in this embodiment can be a distributed central range hood system 100, and the control method is compatible with various models of branch range hoods 12 (terminal range hoods) based on an open-loop control strategy. Please refer to... Figure 2 The central exhaust system 100 includes: branch exhaust hoods 12, corrugated pipes 16, electrically controlled valves 18, a common exhaust duct 14, a top-mounted fan 20, and a main unit 22. The entire central exhaust system 100 is divided into two parts: the exhaust duct and the control system. The exhaust duct includes: the outlet of the branch exhaust hood 12 connected to one end of the corrugated pipe 16, and the other end of the corrugated pipe 16 connected to the electrically controlled valve 18. The branch exhaust hoods 12, corrugated pipes 16, and electrically controlled valve 18 together form a branch. Multiple branch exhaust hoods are connected to the side wall of the common exhaust duct 14; the top outlet of the common exhaust duct 14 is connected to the top-mounted fan 20. The valve plate of the electrically controlled valve 18 can be opened and closed by the motor, and the electrically controlled valve 18 has two states during operation: fully open and fully closed.

[0079] The control system includes: adjustable speeds of branch range hoods 12 and top fan 20; data communication between the main unit 22 and each branch range hood 12; data communication between the main unit 22 and the top fan 20; a control platform in the main unit 22 capable of receiving, processing, and transmitting data; data communication between the main unit 22 and server 24; and the electric control valve 18 in each branch can determine whether the branch range hood 12 is turned on by communicating with it via data or by identifying its power.

[0080] The data information sent from the branch range hood 12 to the main unit 22 includes the range hood ID, model information, and speed setting. The main unit 22 sends the rotation speed of each branch range hood 12 to the main unit 22, and the rotation speed of the top fan 20 to the top fan 20. The main unit 22 sends the model information of the range hoods under its control to the server 24, and the server 24 sends the physical parameters of all range hood models under its control to the main unit 22. These physical parameters include, but are not limited to, the aerodynamic performance, vent position, and the correspondence between speed setting and required airflow for each model of range hood.

[0081] An activated branch range hood 12 refers to a branch range hood 12 whose fan is on, and the fan speed can be any speed. After being activated, the branch range hood 12 can report its model information and speed setting information to the main unit 22 via wired or wireless means. The corresponding electronically controlled valve 18 will then open, allowing the branch range hood 12 to exhaust fumes into the common exhaust duct 14.

[0082] After obtaining the model information of all the activated branch range hoods 12, the host 22 can obtain the physical parameters of all the activated branch range hoods 12 through the local database and / or the server 24.

[0083] In some implementations, please refer to Figure 3 Step 103 includes:

[0084] Step 111: Match the model of the branch range hood 12 with the range hood models stored in the local database;

[0085] Step 113: If a matching model exists, determine the physical parameters of the branch range hood 12 based on the local database;

[0086] Step 115: If a model fails to match, send the model to server 24 and receive the physical parameters returned by server 24. This allows for initial matching in the local database, followed by retrieving the physical parameters of the failed model from server 24, thus improving efficiency.

[0087] Specifically, the local database can be located on host 22, on a branch range hood 12, or part of the local database can be located on host 22 while another part is located on one or more branch range hoods 12. Alternatively, the local database can be distributed across different branch range hoods 12; no specific limitation is made here. By first matching in the local database, latency caused by network problems is reduced, thus improving efficiency.

[0088] Server 24 can be a cloud server 24, which stores the physical parameters of all models of range hoods. Server 24 will return the physical parameters corresponding to the model information of the range hoods controlled by host 22 to host 22, and host 22 can update its local database.

[0089] In some implementations, step 103 includes:

[0090] The system sends the model numbers of all activated branch range hoods 12 to the server 24 and receives the physical parameters of all activated branch range hoods 12 returned by the server 24. In this way, the physical parameters of all activated branch range hoods 12 can be obtained directly from the server 24.

[0091] In one implementation, after obtaining the physical parameters of all activated branch range hoods 12, the current required airflow for each branch range hood 12 can be calculated based on its model information and speed setting information. Specifically, the correspondence between the model information, speed setting information, and required airflow of the branch range hood 12 can be pre-defined and stored. This correspondence can be pre-stored in the branch range hood 12, the host 22, or the server 24. When the model of a branch range hood 12 fails to match in the local database, the host 22 can obtain the corresponding correspondence from the server 24.

[0092] In one implementation, after obtaining the model information and speed information of each branch range hood 12, the current required air volume of each branch range hood 12 can be calculated using the above correspondence.

[0093] In one example, the correspondence is as follows: the branch range hood 12 is model A, with speed settings of 1, 2, and 3, corresponding to airflow of 200 cubic meters per hour, 300 cubic meters per hour, and 400 cubic meters per hour, respectively. When branch range hood 12 (model A) is turned on and the speed setting is 1, the main unit 22 can determine that the required airflow for branch range hood 12 is 200 cubic meters per hour. The speed setting can be selected by the user, or the branch range hood 12 can automatically determine the speed setting based on the amount of cooking fumes. Specifically, branch range hood 12 has a smoke-following function, allowing it to automatically determine the speed setting based on the amount of cooking fumes. The branch range hood 12 with the smoke-following function includes a smoke sensor.

[0094] Each branch range hood 12 and the top fan 20 adjust their speed according to the received speed information to complete the air volume control process. When the branch range hood 12 is turned off, the branch electric control valve 18 can close in conjunction with the range hood after recognizing the shutdown action, and at the same time, the branch range hood 12 no longer uploads information to the main unit 22.

[0095] In some implementations, the control method includes:

[0096] The physical parameters of the range hood stored in the local database are updated using the physical parameters returned by server 24. This allows for the rapid acquisition of the physical parameters of the branch range hood 12 in subsequent operations.

[0097] Specifically, by using the physical parameters returned by the server 24 to update the physical parameters of the range hoods in the local database, when the branch range hood 12 is turned on again, the host 22 can directly and quickly obtain the physical parameters of all branch range hoods 12 from the local database, thus improving efficiency.

[0098] In some implementations, the control method further includes:

[0099] The required rotational speed of the top fan 20 is calculated using a control algorithm, and the rotational speed is then adjusted to the top fan 20 so that it operates according to the specified speed. The top fan 20 is connected to the outlet of the common smoke exhaust duct 14. In this way, the top fan 20 can be controlled.

[0100] Specifically, the above steps can be performed in step 109, simultaneously with step 109, or before or after step 109, without any specific limitation here.

[0101] exist Figure 2 In the illustrated embodiment, the central exhaust system 100 includes a top fan 20. The cooperation between the top fan 20 and the branch exhaust hoods 12 optimizes the smoke extraction effect and reduces noise. For example, when the top fan 20 is turned on, the pressure in the common exhaust duct 14 decreases, reducing the resistance of the branch exhaust hoods 12. To achieve the same required airflow, the branch exhaust hoods 12 can operate at a lower speed, thus reducing noise. Alternatively, at the same branch exhaust hood speed, the branch exhaust hoods 12 provide a larger airflow, improving the smoke extraction effect.

[0102] In this embodiment of the invention, the control algorithm can be an open-loop control algorithm, which allows for pre-testing calibration or empirical formula estimation of the aerodynamic characteristics of system components. The flow of the central smoke machine system 100 can be simplified to a one-dimensional aerodynamic model, such as... Figure 4 As shown, it can be broken down into the following components: branch range hood 12; corrugated pipe 16; tee 26; common exhaust duct 14; and top fan 20. The tee 26 is the three-way area formed by the branch's inlet to the common exhaust duct 14 and the common exhaust duct 14. When the flow from the branch flows into the common exhaust duct 14 through this three-way area, a three-way confluence loss occurs; when the flow from the common exhaust duct 14 passes through this three-way area, a three-way direct flow loss occurs. When the valve opening angle is constant, the three-way confluence loss coefficient and the three-way direct flow loss coefficient are determined by the airflow ratio (Q / Q_main) of the branch and the common exhaust duct 14 (Equation 3-4 below). The aerodynamic characteristics of each component can be determined through experiments, simulations, or estimation using empirical formulas. The aerodynamic characteristics of each component are expressed as follows:

[0103] Pt_yanji=F1(N_yanji,Q)(Formula 1)

[0104] ξ_b=F2(Q)(Equation 2)

[0105] ξ_con=F3(Q / Q_main)(Equation 3)

[0106] ξ_dir=F4(Q / Q_main)(Equation 4)

[0107] λ=F5(Q_main)(Equation 5)

[0108] Ps_dingduan=F6(N_dingduan,Q_total)(Formula 6)

[0109]

[0110]

[0111] Among them, Pt_yanji represents the total pressure rise of the range hood;

[0112] N_yanji — Range hood speed;

[0113] Q—Air volume required for the range hood;

[0114] ξ_b——Belling pipe resistance coefficient 16;

[0115] ξ_con——Branching loss coefficient of branch tees;

[0116] ξ_dir——DC loss coefficient of public smoke exhaust duct 14 tee;

[0117] λ—Friction factor along the public smoke exhaust duct;

[0118] Q_main — The required air volume of the combined public smoke exhaust duct 14;

[0119] Ps_dingduan——Top fan 20 static pressure rise;

[0120] N_dingduan——Top fan speed 20;

[0121] Q_total — Total air volume of public smoke exhaust duct 14 (required air volume of top fan 20);

[0122] Q_main m —Total air volume required for the public smoke exhaust duct 14 downstream of the m-th floor;

[0123] Q i —The required airflow for the branch range hood 12 on the i-th floor;

[0124] M — Total number of floors;

[0125] m — the mth layer;

[0126] i——i-th layer;

[0127] When the system is running, the host 22 receives the model information and speed information of all currently activated branch range hoods 12, and determines the required air volume Q of each branch range hood 12 based on this information. iTherefore, the air volume distribution Q_main of the public smoke exhaust duct 14 can be obtained according to Equations 7 and 8. m And Q_total, and then the system's resistance characteristic parameters ξ_b, ξ_con, ξ_dir, and λ can be obtained through Equation 2-5. Assuming the static pressure rise provided by the top fan 20 is Ps_X, the total pressure at the inlet of the top fan 20 can be expressed as:

[0128] Pt_dingduan=0.5·ρV_fan 2 -Ps_X (Equation 9)

[0129] Wherein, V_fan is the average wind speed at the outlet of the top fan 20, and ρ is the air density, which can be obtained from Q_total and the outlet area of ​​the top fan 20.

[0130] First, calculate the total pressure Pt_down of the common exhaust duct downstream of each branch outlet. The total pressure Pt_down downstream of the top-floor (Mth floor) branch outlet. M It can be obtained by subtracting the friction loss from the outlet of the top layer (Mth layer) branch to the inlet of the top fan 20 from Pt_dingduan (Equation 10).

[0131]

[0132] Where, λ M —The resistance coefficient of the public smoke exhaust duct 14 downstream of the branch outlet of the top floor (Mth floor);

[0133] De—Hydraulic diameter of public exhaust duct 14;

[0134] L M —The distance from the branch outlet of the top floor (Mth floor) to the inlet of the top fan 20;

[0135] ρ—air density;

[0136] V_main M —Average wind speed of the public smoke exhaust duct downstream of the branch outlet of the top floor (Mth floor) 14

[0137] Equivalent to V_fan.

[0138] Excluding the top layer, the total downstream pressure Pt_down at the outlet of the m-th branch is... m The total downstream pressure Pt_down can be determined from the outlet of the branch at level m+1. m+1 The total pressure Pt_down of the public smoke exhaust duct 14 downstream of the branch outlet on the m-th floor to the upstream of the branch outlet on the (m+1)-th floor is obtained by subtracting the friction loss and the direct current loss of the main flow on the (m+1)-th floor. Therefore, the total pressure Pt_down of the public smoke exhaust duct 14 downstream of all branch outlets on all floors can be calculated sequentially.

[0139]

[0140] Where, λ m —The resistance coefficient of the public exhaust duct 14 downstream of the branch outlet on the m-th floor;

[0141] L m —The distance between the branch exits of the m-th floor and the (m+1)-th floor;

[0142] ξ_dir m+1 — DC loss coefficient of the public smoke exhaust duct 14 tee at the exit of the branch road on the (m+1)th floor.

[0143] For example, when there are 10 floors in total, and all 12 branch range hoods on the 10th floors are turned on, equation 10 can be used to calculate the total downstream pressure Pt_down of the branch outlet on the top floor (10th floor). 10 Using Equation 11, based on Pt_down of the 10th layer 10 Calculate the total downstream pressure Pt_down9 of the branch outlet on the 9th floor. Based on the total downstream pressure Pt_down9 of the branch outlet on the 9th floor, the total downstream pressure Pt_down8 of the branch outlet on the 8th floor can be calculated, and so on, up to the lowest floor where the range hood 12 of the branch is turned on.

[0144] Secondly, the total pressure rise Pt_yanji required for the m-th branch range hood 12 m It can be obtained by subtracting the sum of the tee confluence loss and the branch bellows 16 loss from Pt_down (Equation 12).

[0145]

[0146] Where, ξ_con m —The merging loss coefficient of the branch tees on the m-th floor;

[0147] ξ_b m —The drag coefficient of the bellows in the m-th layer;

[0148] V m —The average wind speed of the m-th branch.

[0149] Secondly, based on the optimization principle of minimizing the rotation speed of the branch range hood 12, and according to the calculated total pressure rise (Pt_yanji1, Pt_yanji2…Pt_yanji) required by each branch range hood 12, M Find the minimum total pressure rise (Pt_yanji) j The floor j and the preset air volume Q of that floor are also present. j Find the equation that satisfies Q in the calibrated aerodynamic characteristic curve of the range hood (Equation 1). j Minimum required speed N_yanjij The rotation speed is set to that of the layer. Then, the actual total pressure rise at the range hood outlet of that layer (layer j) is calculated using Equation 1 and denoted as Pt_yanji_real. j The system pressure correction value Δp is

[0150] Δp=Pt_yanji_real j -Pt_yanji j (Equation 13)

[0151] Subsequently, the required total pressure rise of each branch range hood 12 and the required static pressure rise of the top fan 20 were adjusted:

[0152] Pt_yanji_real i =Pt_yanji i +Δp (Equation 14)

[0153] Ps_dingduan_real=Ps_X+Δp(Equation 15)

[0154] Then, using the corrected total pressure rise Pt_yanji_real of each branch range hood, the actual total pressure rise of each branch range hood was calculated. i With the preset air volume Q of each floor i The fan speed N_yanji_real of each branch range hood 12 is obtained using Equation 1. i The rotational speed N_dingduan_real of the top fan 20 is obtained by using the corrected actual static pressure rise Ps_dingduan_real and the air volume Q_total of the top fan 20 through Equation 6.

[0155] In some implementations, please refer to Figure 5 Step 109 includes:

[0156] Step 117: Calculate the total pressure of the public exhaust duct 14 downstream of each branch outlet, the tee confluence loss of the floor where the branch range hood 12 is located, and the branch corrugated pipe 16 loss using a control algorithm; 111

[0157] Step 119: Calculate the total pressure rise required for the m-th floor branch range hood 12 based on the total pressure of the public exhaust duct 14 downstream of each branch outlet, the confluence loss of the tee at the floor where the branch range hood 12 is located, and the loss of the branch corrugated pipe 16; 113

[0158] Step 121: Determine the floor with the minimum total pressure rise and the required air volume Q of the branch range hoods 12 on that floor from the calculated total pressure rise required for each branch range hood 12. j And determine the required air volume Q based on the preset aerodynamic characteristic relationship of the range hood. jThe required rotational speed is set to the speed of range hood 12 in the branch where the total pressure rise is minimum. 115

[0159] In this way, the rotation speed of the branch range hood 12 corresponding to the minimum total pressure rise can be determined.

[0160] Specifically, the floor where the minimum total pressure rise occurs can be the j-th floor, and the total pressure of the common smoke exhaust duct 14 downstream of each branch outlet can be Pt_down. The total pressure Pt_down of the common smoke exhaust duct 14 downstream of each branch outlet can be calculated using Equations 10 and 11 above. The total pressure Pt_down of the common smoke exhaust duct 14 downstream of each branch outlet includes the total pressure Pt_down downstream of the top-level branch outlet. M The total downstream pressure Pt_down of the branch outlet at the mth layer (excluding the top layer) m .

[0161] The aerodynamic characteristic relationship can be an aerodynamic characteristic line, which can be determined by the above formula 1. This aerodynamic characteristic line represents the relationship between the total pressure rise of the branch range hood 12 and the rotation speed and air volume.

[0162] In one implementation, the required air volume Q is determined from a preset aerodynamic characteristic relationship of the range hood. j The required rotation speed is the minimum speed. This further optimizes the noise level of the branch range hood 12. Specifically, the rotation speed of the branch range hood 12 can be the minimum while still meeting the required airflow.

[0163] It is understood that in other embodiments, the rotation speed of the branch range hood 12 corresponding to the minimum total pressure rise can be randomly obtained from the aerodynamic characteristic relationship, or a smaller rotation speed.

[0164] In some implementations, the total pressure rise required by the range hood 12 on the m-th branch is obtained by subtracting the confluence loss of the tee and the loss of the branch corrugated pipe 16 on the m-th branch from the total pressure of the common exhaust duct 14 downstream of the m-th branch outlet. This simplifies the calculation method for the total pressure rise required by the range hood 12 on the m-th branch.

[0165] Specifically, the total pressure rise required for the m-th branch range hood 12 can be Pt_yanji m The total pressure of the public exhaust duct 14 downstream of the branch outlet on the m-th floor can be Pt_ m The total pressure rise Pt_yanji required by the m-th branch range hood 12 can be calculated using Equation 12 above. m .

[0166] In some implementations, the total pressure of the common exhaust duct 14 downstream of each branch outlet includes the total pressure downstream of the top-level branch outlet and the total pressure downstream of the m-th layer branch outlet (excluding the top-level branch).

[0167] Step 117 includes:

[0168] The total pressure downstream of the top branch outlet is calculated based on the total pressure at the inlet of the top blower 20 and the friction loss from the outlet of the top branch to the inlet of the top blower 20.

[0169] The total pressure downstream of the branch outlet at level m+1, the friction loss from downstream of the branch outlet at level m to upstream of the branch outlet at level m+1 in the public smoke exhaust duct 14, and the mainstream DC loss at level m+1 are used to calculate the total pressure downstream of the branch outlet at level m. Thus, the total pressure of the public smoke exhaust duct 14 downstream of each branch outlet is calculated.

[0170] Specifically, the total downstream pressure at the top-level branch outlet can be Pt_down. M The total pressure at the inlet of the top fan 20 can be Pt_dingduan, and the friction loss from the outlet of the top layer (Mth layer) branch to the inlet of the top fan 20 can be... The total downstream pressure Pt_down at the top branch outlet M It can be calculated using Equation 10.

[0171] The total downstream pressure of the m-th layer branch outlet can be Pt_down m The total downstream pressure of the branch outlet at the (m+1)th level can be Pt_ m+1 The friction loss along the path from the downstream of the outlet of the m-th branch in the public smoke exhaust duct 14 to the upstream of the outlet of the (m+1)-th branch can be... The mainstream DC loss of the (m+1)th layer can be The total downstream pressure Pt_down at the outlet of the m-th layer branch is... m It can be calculated using Equation 11 above. V can be determined in a manner similar to that used for V_fan.

[0172] In some implementations, please refer to Figure 6 The control methods include:

[0173] Step 123: Based on the rotation speed and required air volume of the branch range hood 12 on the floor where the minimum total pressure rise is located, calculate the actual total pressure rise at the outlet of the branch range hood 12 on the floor where the minimum total pressure rise is located, and the system pressure correction value.

[0174] Step 125: Based on the system pressure correction value, correct the total pressure rise required by the range hood 12 on each floor except the floor with the minimum total pressure rise and the static pressure rise required by the top fan 20.

[0175] Step 127: Based on the corrected total pressure rise required by each branch range hood 12 and the required air volume Q for each floor... i Calculate the rotational speed N_yanji_real of the range hoods 12 on each floor branch.i The required static pressure rise Ps_dingduan_real of the top fan 20, obtained after correction, and the air volume of the top fan 20 are used to calculate the rotational speed N_dingduan_real of the top fan 20. In this way, the rotational speeds of the branch range hoods 12 and the top fan 20 on other floors can be determined.

[0176] Specifically, the floor containing the minimum total pressure rise can be the j-th floor. After first determining the rotation speed (e.g., minimum speed) of the range hood 12 on the j-th floor corresponding to the minimum total pressure rise, the actual total pressure rise at the outlet of the range hood 12 on the j-th floor can be further determined. The actual total pressure rise at the outlet of the range hood 12 on the j-th floor can be Pt_yanji_real j Pt_yanji_real is determined by Equation 1. j The system pressure correction value Δp can be determined using Equation 13.

[0177] The total pressure rise (actual total pressure rise) required by each branch range hood 12 can be Pt_yanji_real i Pt_yanji_real can be determined using Equation 14. i The static pressure rise (actual total pressure rise) required by the top fan 20 can be Ps_dingduan_real, which can be determined by Equation 15.

[0178] Using the corrected total pressure rise Pt_yanji_real of each branch range hood i Air volume Q required for each floor i The fan speed N_yanji_real of each branch range hood 12 is obtained using Equation 1. i Using the corrected static pressure rise Ps_dingduan_real of the top fan 20 and the air volume Q_total of the top fan 20, the rotational speed N_dingduan_real of the top fan 20 is obtained through Equation 6, and the corresponding rotational speed is sent to the branch range hood 12 and the top fan 20, so that the branch range hood 12 and the top fan 20 operate at the sent rotational speed.

[0179] In one implementation, the speed of the j-th branch range hood 12 corresponding to the minimum total pressure rise is first determined as the minimum speed, and the speed of other branch range hoods 12 is also the minimum speed required to meet the required air volume, thereby optimizing the noise and power consumption of the branch range hoods 12.

[0180] In some implementations, the physical parameters include a first relationship between the total pressure rise and rotational speed of the range hood and its airflow; a second relationship between the required airflow of the range hood and its speed setting; a third relationship between the resistance coefficient of the corrugated pipe 16 and its airflow; a first distance between the outlet of the top branch and the inlet of the top fan 20; and a second distance between the outlets of the m-th and (m+1)-th branch lines. The first, second, and third relationships, as well as the first and second distances, are parameters related to the model of the branch range hood 12. Thus, when the model of the branch range hood 12 changes, the relevant physical parameters can be obtained to achieve accurate control.

[0181] Specifically, when the model of the branch range hood 12 changes, the following four types of physical parameters in the above control algorithm depend on the model of the branch range hood 12, and therefore can be updated through data interaction between the host 22 and the server 24:

[0182] a) The first relationship between the total pressure rise of the range hood, the rotation speed, and the air volume (Equation 1);

[0183] b) The second relationship between the required air volume Q of the range hood and the setting;

[0184] c) The third relationship between the resistance coefficient of the bellows 16 and the air volume: ξ_b=F2(Q)

[0185] d) The first distance L between the top-level (Mth level) branch outlet and the top fan inlet (20 units) M And the second distance L between the branch exits of the m-th floor and the (m+1)-th floor. m .

[0186] In other embodiments, the central range hood system 100 can omit the top fan 20, resulting in Ps_X = 0. Therefore, the actual total pressure rise Pt_yanji_real of each branch range hood 12 can be directly calculated using Equation 9-12, and the fan speed N_yanji_real of each branch range hood 12 can be obtained according to Equation 1. This achieves low cost and simple control for the central range hood system 100. However, this solution cannot optimize for the lowest possible speed of the branch range hood 12. It is worth noting that this solution can serve as a backup emergency plan in case the top fan 20 fails or is under maintenance.

[0187] In some implementations, the control method includes:

[0188] When the branch range hood 12 is turned on, the control valve 18 is opened in conjunction with it. The control valve 18 is connected to the side wall of the branch range hood 12 and the common exhaust duct 14. This prevents backflow of fumes.

[0189] Specifically, when the branch range hood 12 is turned on, the electric control valve 18 is activated in conjunction, enabling the activated branch range hood 12 to exhaust smoke smoothly. Moreover, for the unactivated branch range hood 12, it also prevents the smoke from the public exhaust duct from flowing back into the kitchen where the branch range hood 12 is located.

[0190] In one embodiment, the electrically controlled valve 18 has two states: ON / OFF (fully open / fully closed). In the ON state, the valve plate of the electrically controlled valve 18 fully opens the branch; in the OFF state, the valve plate of the electrically controlled valve 18 fully closes the branch. In one embodiment, the opening angle of the valve plate of the electrically controlled valve 18 is adjustable. In addition to the ON / OFF (fully open / fully closed) states, there is at least one intermediate state between the ON / OFF (fully open / fully closed) states. In the intermediate state, the valve plate of the electrically controlled valve 18 can be in any position between the fully open and fully closed positions.

[0191] Specifically, the valve opening angle of the electrically controlled valve 18 is adjustable, and data communication can be performed between the electrically controlled valve 18 and the main unit 22. In the scheme where the electrically controlled valve 18 only has two states, ON / OFF (fully open / fully closed), under certain extreme operating conditions, the calculated operating speed may exceed the operating range of the branch range hood 12. Since the valve opening angle of the electrically controlled valve 18 is adjustable, airflow distribution can be assisted by adjusting the valve opening angle under such extreme conditions. Accordingly, in this embodiment, the influence of the valve opening angle on the aerodynamic characteristics of the three-way valve needs to be considered in the aerodynamic calibration and control algorithm. In this case, the resistance characteristics of the three-way valve are jointly determined by the airflow ratio (Q / Qmain) of the branch and the common exhaust duct 14 and the valve opening angle (θ), i.e., replacing Equations 3 and 4 with Equations 18 and 19 respectively.

[0192] ξ_con=F3(Q / Q_main,θ)(Formula 18)

[0193] ξ_dir=F4(Q / Q_main,θ)(Formula 19)

[0194] Therefore, the central smoke machine system 100 of this embodiment can expand the range of applicable working conditions.

[0195] In other embodiments, the electrically controlled valve 18 is replaced with a traditional passive flue check valve. In this scheme, the influence of branch air volume on the aerodynamic characteristics of the tee needs to be considered in the aerodynamic characteristic calibration and control algorithm of the tee. In this case, the resistance characteristics of the tee of the system are jointly determined by the ratio of branch air volume to common exhaust duct 14 (Q / Q_mian) and branch air volume (Q), that is, Equations 3 and 4 are replaced with Equations 16 and 17, respectively.

[0196] ξ_con=F3(Q / Q_main,Q)(Formula 16)

[0197] ξ_dir=F4(Q / Q_main,Q)(Formula 17)

[0198] Therefore, calibration and control algorithms are performed in this case. The advantage of this approach is its lower system cost.

[0199] In some implementations, the control method includes:

[0200] Obtain the installation location information of branch range hood 12;

[0201] The parameters related to the installation location of the branch range hood 12 in the control algorithm are adjusted according to the installation location information.

[0202] Specifically, since the installation location of the branch range hood 12 may differ from the default location in actual use, the user can initiate the reporting of the installation location information after the branch range hood 12's installation location changes. Specifically, the branch range hood 12's installation location information can be reported to the server 24 or the local branch range hood 12 via a customized method. Subsequently, the installation location information is sent to the host 22 through data communication between the server 24 or the local branch range hood 12 and the host 22. The host 22 adjusts the corresponding parameters in the control algorithm according to the user-defined installation location, such as the relationship between the corrugated pipe 16 resistance coefficient and airflow ξ_b=F2(Q), and the first distance L between the top-level (Mth layer) branch outlet and the top-level fan 20 inlet. M The second distance L between the branch exits of the m-th floor and the (m+1)-th floor m .

[0203] After the installation location is changed, the aforementioned first and second distances can be measured by the user and reported to the server 24 or the local branch range hood 12. The user measures the horizontal and vertical distances between the smoke outlet of the branch range hood 12 and the interface of the common exhaust duct 14, and reports them to the server 24 or the local branch range hood 12. The host 22 can determine the relationship between the resistance coefficient of the corrugated pipe 16 and the air volume based on the aforementioned horizontal and vertical distances.

[0204] In summary, the control method of the central smoke machine system 100 according to the embodiments of the present invention has the following innovative points:

[0205] ① A control algorithm is built based on a one-dimensional aerodynamic model of the smoke exhaust system:

[0206] The three-dimensional flow of the smoke exhaust system is simplified into a one-dimensional aerodynamic system by reducing the dimension, which greatly improves the calculation efficiency while ensuring the accuracy of air volume control and enables rapid response. At the same time, in the aerodynamic performance calibration of the one-dimensional aerodynamic system, it is proposed to decompose the system into several independent components for aerodynamic performance calibration.

[0207] ② Adopt an open-loop control strategy:

[0208] Because of the high concentration of oil fumes in the exhaust system, sensors are easily contaminated, leading to control failures. Therefore, sensor-based closed-loop control systems have poor reliability and high system and maintenance costs. This invention employs an open-loop control strategy, fundamentally eliminating control failures and offering advantages in system and maintenance costs.

[0209] ③ It can achieve the lowest speed optimization for branch range hoods at speed 12:

[0210] While ensuring the required airflow for users, this control algorithm provides the function of optimizing additional constraints, which can support the optimization of the fan speed of the branch range hood 12, thereby reducing noise at the user end.

[0211] ④ Compatible with various models of range hoods:

[0212] The system can automatically modify the corresponding parameters in the control algorithm according to the different models of the 12 branch range hoods, so as to achieve compatibility with multiple models of range hoods and allow users to choose the range hood model according to their usage habits and personal preferences.

[0213] ⑤ Based on the speed setting and range hood model, the airflow at the user end is set to achieve a good match between the speed setting and the smoke extraction effect:

[0214] Since the structure of the fume hood affects the fume extraction effect, this invention considers the influence of the range hood model on the matching relationship between the fume extraction effect and the required air volume, so as to achieve a good correspondence between the speed setting and the fume extraction effect.

[0215] ⑥ The local database only stores the necessary physical parameters of the range hood. It uses data interaction between the host 22 and the server 24 to automatically update the necessary physical parameters of the range hood, which has lower software and hardware update and maintenance costs while ensuring local response speed.

[0216] The control method of the central smoke machine system 100 according to the embodiments of the present invention can achieve at least the following technical effects:

[0217] ① The flow of the public smoke exhaust system is simplified into a one-dimensional aerodynamic model, the control algorithm has high computational efficiency, and the single-chip microcomputer calculation time is in the millisecond level; it supports users to replace the branch range hoods 12;

[0218] ② An open-loop control strategy is adopted, which eliminates the need for additional sensors, resulting in low system and maintenance costs and high system reliability;

[0219] ③Optimization can be carried out according to the principle of the lowest speed of 12 for branch range hoods, which can significantly reduce noise at the user end while meeting the air volume requirements of the user end;

[0220] ④ Compatible with various models of range hoods;

[0221] ⑤ Based on the gear setting and range hood model, the air volume of the branch range hood is given as 12 to achieve a good match between the gear setting and the smoke extraction effect;

[0222] ⑥ The local database only stores the necessary physical parameters of the range hood. It uses data interaction between the host 22 and the server 24 to automatically update the necessary physical parameters of the range hood, which has lower software and hardware update and maintenance costs while ensuring local response speed.

[0223] Please refer to Figure 7 According to an embodiment of the present invention, a control device 200 for a central smoke machine system 100 includes a processor 28 and a memory 30. The memory 30 stores a computer program, which, when executed by the processor 28, implements the steps of the control method described in any of the above embodiments.

[0224] 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.

[0225] Please refer to Figure 7 A central smoke machine system 100 according to an embodiment of the present invention includes the control device 200 described in the above embodiment.

[0226] The present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the control method of any of the above embodiments.

[0227] 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.

[0228] In one implementation, the steps of the control method implemented by the computer program when executed by the processor 28 include:

[0229] Step 101: Obtain the model information and speed information of all activated branch range hoods 12. The branch range hoods 12 are connected to the common exhaust duct 14.

[0230] Step 103: Based on the model information of the branch range hood 12, obtain the physical parameters of all activated branch range hoods 12 through the local database and / or server 24.

[0231] Step 105: Adjust the corresponding aerodynamic parameters in the control algorithm according to the physical parameters of the branch range hood 12;

[0232] Step 107: Calculate the required air volume of the branch range hood 12 based on its model information and speed setting information;

[0233] Step 109: Calculate the required rotational speed to meet the demand for airflow using a control algorithm and send the rotational speed down to the branch range hood 12 so that the branch range hood 12 operates according to the rotational speed.

[0234] The aforementioned control device 200, central range hood system 100, and computer-readable storage medium can obtain the physical parameters of all activated branch range hoods 12 through a local database and / or server 24, and adjust the control algorithm accordingly to obtain the required speed. This ensures that even if the user changes the range hood model, the control method can accurately control the operation of the branch range hoods 12, thus improving the user experience.

[0235] 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.

[0236] 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.

[0237] 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 of a central range hood system, characterized by, include: Obtain the model information and speed information of all activated branch range hoods, which are connected to the common exhaust duct; Based on the model information of the branch range hoods, obtain the physical parameters of all activated branch range hoods through a local database and / or server; The aerodynamic parameters in the control algorithm are adjusted according to the physical parameters of the branch range hood; The required air volume of the branch range hood is calculated based on the model information and the speed setting information of the branch range hood. The control algorithm is used to calculate the rotational speed required to meet the demand for air volume and the rotational speed is then sent to the branch range hood so that the branch range hood operates according to the rotational speed. The control method further includes: The control algorithm is used to calculate the required rotational speed of the top fan and the required rotational speed is sent to the top fan so that the top fan operates according to the required rotational speed. The top fan is connected to the outlet of the common smoke exhaust duct. The control algorithm is used to calculate the rotational speed required to meet the desired airflow, including: The control algorithm is used to calculate the total pressure of the public exhaust duct downstream of each branch outlet, the tee confluence loss of the branch range hood, and the branch corrugated pipe loss. The total pressure rise required for the m-th branch range hood is calculated based on the total pressure of the common exhaust pipe downstream of each branch outlet, the tee confluence loss of the branch range hood on the floor where the branch range hood is located, and the branch corrugated pipe loss. The control method involves determining the floor with the minimum total pressure rise and the required airflow of the branch range hoods on that floor from the calculated total pressure rise of each branch range hood, and determining the required rotational speed to meet the required airflow based on a preset aerodynamic characteristic relationship of the range hoods, setting the rotational speed as the rotational speed of the branch range hood on the floor with the minimum total pressure rise; the control method includes: Based on the rotation speed and required air volume of the range hoods on the floor with the minimum total pressure rise, calculate the actual total pressure rise at the outlet of the range hoods on the floor with the minimum total pressure rise, and the system pressure correction value. Based on the system pressure correction value, correct the total pressure rise required by the range hoods on each floor branch except the floor with the minimum total pressure rise and the static pressure rise required by the top fan. The rotational speed of each branch range hood is calculated based on the total pressure rise required by each branch range hood and the required air volume of each branch range hood after correction. The rotational speed of the top fan is calculated using the static pressure rise required by the top fan and the air volume of the top fan after correction. The minimum rotational speed is determined in the preset aerodynamic characteristic relationship of the range hood to meet the required air volume.

2. The control method according to claim 1, characterized by, Based on the model information of the branch range hoods, the physical parameters of all activated branch range hoods are obtained through a local database and / or server, including: The model of the branch range hood is matched with the model of the range hood already stored in the local database; If a matching model exists, the physical parameters of the branch range hood are determined based on the local database; If a model fails to match, the model that failed to match is sent to the server, and the physical parameters returned by the server are received.

3. The control method according to claim 1, characterized by, Based on the model information of the branch range hoods, the physical parameters of all activated branch range hoods are obtained through a local database and / or server, including: Send the model numbers of all activated branch range hoods to the server, and receive the physical parameters of all activated branch range hoods returned by the server.

4. The control method according to claim 3, characterized by, The control method includes: The physical parameters of the range hood stored in the local database are updated using the physical parameters returned by the server.

5. The control method according to claim 1, characterized in that, The total pressure of the common exhaust duct downstream of each branch outlet includes the total pressure downstream of the top-level branch outlet and the total pressure downstream of the m-th layer branch outlet (excluding the top-level branch outlet). The total pressure of the public smoke exhaust duct downstream of each branch outlet, calculated using the aforementioned control algorithm, includes: The total pressure downstream of the top branch outlet is calculated based on the total pressure at the top fan inlet and the friction loss from the top branch outlet downstream to the top fan inlet. The total pressure downstream of the branch outlet of the m+1th layer is calculated based on the total pressure downstream of the branch outlet of the m+1th layer, the friction loss from the downstream of the branch outlet of the m+1th layer to the upstream of the branch outlet of the m+1th layer in the public smoke exhaust duct, and the mainstream DC loss of the m+1th layer.

6. The control method according to claim 1, characterized in that, The total pressure rise required by the range hood in the m-th branch is obtained by subtracting the tee confluence loss and the branch corrugated pipe loss from the total pressure of the common exhaust pipe downstream of the m-th branch outlet.

7. The control method according to any one of claims 1-6, characterized in that, The physical parameters include a first relationship between the total pressure rise and rotation speed of the range hood and the air volume, a second relationship between the required air volume of the range hood and the speed setting, a third relationship between the corrugated pipe resistance coefficient and the air volume, a first distance between the top branch outlet and the top fan inlet, and a second distance between the m-th branch outlet and the m+1-th branch outlet. The first relationship, the second relationship, the third relationship, the first distance, and the second distance are physical parameters related to the model of the branch range hood.

8. The control method according to claim 1, characterized in that, The control method includes: After the branch range hood is turned on, the control valve is activated in conjunction with it. The control valve is connected to the branch range hood and the common exhaust duct.

9. The control method according to claim 1, characterized in that, The control method includes: Obtain the installation location information of the branch range hood; The parameters related to the installation location of the branch range hood in the control algorithm are adjusted according to the installation location information.

10. 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 according to any one of claims 1-9.

11. A central smoke-making system, characterized in that, Includes the control device as described in claim 10.

12. 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 according to any one of claims 1-9.

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