A central range hood system, its control method and control device

Abstract

Embodiments of the present invention disclose a central range hood system, a control method, and a control device therefor. The control method includes: receiving power-on / off signals from terminals and identifying terminals in the power-on state as powered-on terminals; obtaining operating condition information of the powered-on terminals and, based on the operating condition information, calculating the actual exhaust resistance of each powered-on terminal at a preset exhaust volume; determining the maximum exhaust resistance among the actual exhaust resistances; and controlling the host to shut down when the maximum exhaust resistance is less than or equal to zero; otherwise, controlling the host to shut down. The technical solutions of the embodiments of the present invention enable the central range hood system to operate more efficiently and energy-efficiently.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of kitchen appliance technology, and in particular to a central range hood system and a control method and control device thereof. Background Art

[0002] A central range hood system consists of a main unit, a terminal, and a power distribution valve. The main unit is installed at the common flue outlet on a residential rooftop, forcing the exhaust of cooking fumes from within the duct and containing a fan. The terminal is an exhaust device such as a range hood or integrated stove. The power distribution valve is installed between the terminal's exhaust duct outlet and the common flue inlet, regulating the terminal's exhaust volume. The terminal, power distribution valve, and main unit communicate via wired or wireless means.

[0003] When the terminal's exhaust resistance is high, the host computer can be turned on to increase exhaust power to assist the terminal's exhaust. However, existing technologies often determine whether the host computer is turned on by judging the number of terminals powered on or the power-on rate. This type of control logic suffers from a mismatch between the system's actual exhaust power requirements and the host computer's power supply, resulting in either excess system power and high power consumption, or insufficient system power and poor exhaust. Summary of the Invention

[0004] An embodiment of the present invention provides a central range hood system and a control method and a control device thereof, so as to enable the central range hood system to operate in a more efficient and energy-saving manner.

[0005] In a first aspect, an embodiment of the present invention provides a control method for a central range hood system, comprising:

[0006] Receiving a power-on / off signal from a terminal, and determining a terminal in a power-on state as a power-on terminal;

[0007] Obtaining the operating condition information of the powered-on terminals and calculating the actual exhaust resistance of each powered-on terminal at a preset exhaust volume based on the operating condition information;

[0008] Determine the maximum exhaust resistance among the actual exhaust resistances;

[0009] When the maximum exhaust resistance is less than or equal to zero, the control host is turned off, otherwise the control host is turned on.

[0010] Optionally, the operating condition information includes: preset exhaust volume, the floor where each powered-on terminal is located, the cross-sectional area of the common flue, the roughness of the common flue, the total number of powered-on terminals, the total number of floors, and the operating gear of each powered-on terminal;

[0011] Calculate the actual exhaust resistance of each powered-on terminal at the preset exhaust volume based on the operating condition information, including:

[0012] Calculate the friction resistance and confluence resistance of the power-on terminals at the preset exhaust volume based on the preset exhaust volume, the floors where each power-on terminal is located, the cross-sectional area of the public flue, the roughness of the public flue, the total number of power-on terminals, and the total number of floors;

[0013] Determining the exhaust power of the powered-on terminal at a preset exhaust volume according to the operating gear of the powered-on terminal;

[0014] The actual exhaust resistance of the powered-on terminal at a preset exhaust volume is calculated based on the friction resistance, confluence resistance, and exhaust power.

[0015] Optionally, after the control host is turned on, the control method further includes:

[0016] Determine and adjust the target operating frequency of the host based on the maximum exhaust resistance and total exhaust volume.

[0017] Optionally, the operating condition information includes a preset exhaust volume and a total number of powered-on terminals;

[0018] Determine and adjust the target operating frequency of the host based on the maximum exhaust resistance and total exhaust volume, including:

[0019] Calculate the total exhaust volume based on the preset exhaust volume and the total number of powered-on terminals;

[0020] According to the maximum exhaust resistance and the total exhaust volume, a target function relationship is determined in a preset functional relationship cluster of operating frequency, host exhaust power and system exhaust volume, and a target operating frequency is determined based on the target function relationship;

[0021] Adjust the host's operating frequency to the target operating frequency.

[0022] Optionally, after the control host is turned on, the control method further includes:

[0023] The target valve opening angle of the power distribution valve corresponding to the terminal is calculated and adjusted according to the maximum exhaust resistance and the actual exhaust resistance of the terminal.

[0024] Optionally, calculating and adjusting a target valve opening angle of a power distribution valve corresponding to the terminal according to the maximum exhaust resistance and the actual exhaust resistance of the terminal includes:

[0025] Calculate the resistance difference between the maximum exhaust resistance and the actual exhaust resistance of the terminal;

[0026] Calculating a target valve opening angle of the power distribution valve corresponding to the terminal based on a preset functional relationship between the relative resistance difference and the valve opening angle and the resistance difference;

[0027] The valve opening angle of the power distribution valve corresponding to the terminal is adjusted to the target valve opening angle.

[0028] Optionally, after the control host is shut down, the control method further includes:

[0029] The opening angle of the power distribution valve corresponding to each power-on terminal is controlled to be 90°.

[0030] In a second aspect, an embodiment of the present invention further provides a control device for a central range hood system, comprising:

[0031] A signal receiving module, configured to receive a power-on / off signal from a terminal and determine a terminal in a power-on state as a power-on terminal;

[0032] A calculation module is used to obtain the working condition information of the powered-on terminals and calculate the actual exhaust resistance of each powered-on terminal under a preset exhaust volume based on the working condition information;

[0033] A comparison module, used for determining a maximum exhaust resistance among the actual exhaust resistances;

[0034] The control module is used to control the host to be turned off when the maximum exhaust resistance is less than or equal to zero, and to control the host to be turned on otherwise.

[0035] Optionally, after the control host is turned on, the control module is further configured to:

[0036] Determine and adjust the target operating frequency of the host based on the maximum exhaust resistance and total exhaust volume; and / or,

[0037] The target valve opening angle of the power distribution valve corresponding to the terminal is calculated and adjusted according to the maximum exhaust resistance and the actual exhaust resistance of the terminal.

[0038] In a third aspect, an embodiment of the present invention further provides a central range hood system, comprising:

[0039] Multiple terminals;

[0040] Multiple power distribution valves are set in one-to-one correspondence with the terminals and are communicatively connected; the power distribution valves are used to detect the working condition information of the terminals;

[0041] The host is connected to communicate with each power distribution valve to obtain working condition information; the host is used to execute the control method provided by the first aspect.

[0042] The control method of the central range hood system provided by the embodiment of the present invention receives the power on and off signals of the terminal, determines the terminal in the power on state as the power on terminal, then obtains the working condition information of the power on terminal, and calculates the actual exhaust resistance of each power on terminal under the preset exhaust volume according to the working condition information, and determines the maximum exhaust resistance among the actual exhaust resistances. When the maximum exhaust resistance is less than or equal to zero, the host is controlled to be turned off, otherwise the host is controlled to be turned on. The actual auxiliary exhaust power demand in the central range hood system can be determined according to the maximum exhaust resistance, and the start and stop of the host's fan can be controlled according to the actual auxiliary exhaust power demand of the system, thereby avoiding the problem of mismatch between the actual auxiliary exhaust power demand and the exhaust power provided by the host, and providing sufficient exhaust power to the system while saving power consumption, thereby achieving energy-saving and high-efficiency effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a structural diagram of a central range hood system provided by an embodiment of the present invention;

[0044] Figure 2 1 is a flow chart of a control method for a central range hood system provided by an embodiment of the present invention;

[0045] Figure 3 1 is a flow chart of another method for controlling a central range hood system provided by an embodiment of the present invention;

[0046] Figure 4 1 is a schematic diagram of a cluster of functional relationships between the host exhaust power, the system exhaust volume, and the host operating frequency provided by an embodiment of the present invention;

[0047] Figure 5 1 is a flow chart of another method for controlling a central range hood system provided by an embodiment of the present invention;

[0048] Figure 6 1 is a schematic diagram of a curve showing a functional relationship between relative resistance difference and valve opening angle provided by an embodiment of the present invention;

[0049] Figure 7 This is a specific flow chart of another control method for a central range hood system provided by an embodiment of the present invention;

[0050] Figure 8 It is a structural schematic diagram of a control device of a central range hood system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0052] Figure 1 Schematic diagram of the structure of a central range hood system provided by an embodiment of the present invention. Figure 1 As shown, the central range hood system includes multiple terminals 1, multiple power distribution valves 2 and a host 3, wherein the terminal 1 can be a range hood or an integrated stove; the power distribution valves 2 are set in a one-to-one correspondence with the terminal 1 and are communicatively connected, and the host 3 is communicatively connected with each power distribution valve 2. The host 3 can provide auxiliary exhaust power when the exhaust power of the terminal 1 is insufficient; the power distribution valve 2 is used to detect the working condition information of the terminal 1 and send the working condition information to the host 3. After obtaining the working condition information, the host 3 can execute the control method provided in any of the following embodiments.

[0053] Specifically, the host 3 includes a memory and a processor. The memory stores a computer program. When the processor runs the program, it can execute the control method provided in any of the following embodiments.

[0054] Specifically, operating condition information includes the terminal's power-on / off status, the preset exhaust volume of terminals in the powered-on state (referred to as powered-on terminals), the floor on which each powered-on terminal is located, the cross-sectional area of the common flue, the roughness of the common flue, the total number of powered-on terminals, the total number of floors, and the operating position of each powered-on terminal. Based on this operating condition information, the host computer can calculate the actual auxiliary exhaust power demand of the central range hood system. It can then control the host computer's start and stop, adjust the host computer's operating frequency, and rationally allocate power to the central range hood system, achieving energy-saving and high-efficiency results.

[0055] The following describes in detail embodiments of a control method for a central range hood system.

[0056] Figure 2 FIG. 1 is a flow chart of a control method of a central range hood system provided by an embodiment of the present invention, such as Figure 2 As shown, the control method includes the following steps:

[0057] S101: Receive a power on / off signal from a terminal, and determine a terminal in a power on state as a power on terminal.

[0058] Specifically, the power distribution valve on each floor can detect the power-on / off signals of the corresponding terminals in real time and transmit them to the host computer. Upon receiving the power-on / off signals, the host computer can identify the terminals that are powered on (i.e., have power-on signals) as powered-on terminals. For example, the power distribution valve can determine the operating status of the terminals by detecting their operating current and determine the power-on / off signals.

[0059] S102: Acquire the operating condition information of the powered-on terminals, and calculate the actual exhaust resistance of each powered-on terminal under a preset exhaust volume according to the operating condition information.

[0060] The preset exhaust volume is a preset target exhaust volume that the terminal is to achieve. In this embodiment, the terminal operates in a constant air volume mode. In other words, the exhaust volume of the terminal remains constant at the preset exhaust volume.

[0061] During ventilation on any floor, the exhaust power provided by the terminal must overcome the resistance encountered during the exhaust process. When the exhaust power provided by the terminal is greater than or equal to the resistance encountered, the preset exhaust volume can be achieved solely by the power provided by the terminal. When the exhaust power provided by the terminal is less than the resistance encountered, the host computer is required to provide exhaust power to assist the terminal in exhausting the preset volume.

[0062] The above-mentioned “actual exhaust resistance” refers to the remaining exhaust resistance experienced by the terminal after removing the exhaust power provided by the terminal. In other words, the actual exhaust resistance is the difference between the exhaust resistance experienced by the terminal and the exhaust power provided by the terminal.

[0063] The operating condition information, which represents the parameters of the terminal's operating environment, allows calculation of the terminal's exhaust resistance and the exhaust power it can provide, ultimately determining the terminal's actual exhaust resistance at a preset exhaust volume. The specific parameters in the operating condition information will be explained in detail later and are not detailed here.

[0064] According to the above analysis, whether the host needs to perform auxiliary exhaust can be determined based on the actual exhaust resistance, so that whether to turn on the host can be determined based on the actual exhaust resistance to achieve energy-saving and high-efficiency effects. See S103 and S104 for details.

[0065] S103: Determine the maximum exhaust resistance among the actual exhaust resistances.

[0066] S104. When the maximum exhaust resistance is less than or equal to zero, the control host is turned off; otherwise, the control host is turned on.

[0067] The maximum exhaust resistance can represent the auxiliary exhaust power requirement of the system (ie, the exhaust power provided by the host), and thus it can be determined whether to turn on the host based on the maximum exhaust resistance.

[0068] Specifically, when the maximum exhaust resistance is less than or equal to zero, it indicates that the actual exhaust resistance of all other powered terminals is also less than or equal to zero. At this point, the exhaust power provided by each terminal can overcome the exhaust resistance it encounters, achieving the preset exhaust volume. There is no need for auxiliary exhaust power, and therefore, there is no need to power on the main unit. Similarly, when the maximum exhaust volume resistance is greater than zero, it indicates that the exhaust power provided by a terminal in the system is insufficient to overcome the exhaust resistance it encounters, requiring auxiliary exhaust power. Therefore, the main unit needs to be powered on for auxiliary exhaust to achieve the preset exhaust volume for each terminal.

[0069] The control method of the central range hood system provided by the embodiment of the present invention receives the power on and off signals of the terminal, determines the terminal in the power on state as the power on terminal, then obtains the working condition information of the power on terminal, and calculates the actual exhaust resistance of each power on terminal under the preset exhaust volume according to the working condition information, and determines the maximum exhaust resistance among the actual exhaust resistances. When the maximum exhaust resistance is less than or equal to zero, the host is controlled to be turned off, otherwise the host is controlled to be turned on. The actual auxiliary exhaust power demand in the central range hood system can be determined according to the maximum exhaust resistance, and the start and stop of the host's fan can be controlled according to the actual auxiliary exhaust power demand of the system, thereby avoiding the problem of mismatch between the actual auxiliary exhaust power demand and the exhaust power provided by the host, and providing sufficient exhaust power to the system while saving power consumption, thereby achieving energy-saving and high-efficiency effects.

[0070] Based on the above embodiment, optionally, the operating condition information includes: preset exhaust volume, the floor on which each powered-on terminal is located, the cross-sectional area of the common flue, the roughness of the common flue, the total number of powered-on terminals, the total number of floors, and the operating gear of each powered-on terminal. The above S102 may specifically include the following steps:

[0071] a. Calculate the frictional resistance and confluence resistance of the terminals at the preset exhaust volume based on the preset exhaust volume, the floor on which each terminal is located, the cross-sectional area of the common flue, the roughness of the common flue, the total number of terminals, and the total number of floors.

[0072] b. According to the running gear of the boot terminal, determine the exhaust power of the boot terminal under the preset exhaust volume;

[0073] c. Calculate the actual exhaust resistance of the powered terminal at the preset exhaust volume based on the friction resistance, confluence resistance, and exhaust power.

[0074] Among them, friction resistance is generated by the public flue, and confluence resistance is generated when the exhaust air from other floors merges into the public flue. Figure 1 As the airflow from a particular floor where a power-on terminal is located flows through the entire public flue 4 and is discharged, it primarily needs to overcome the frictional resistance of the duct and the combined resistance of the exhaust air from terminals on other floors merging into the flue. Frictional resistance and combined resistance can be calculated based on the preset exhaust volume, the floor where each power-on terminal is located, the cross-sectional area of the public flue, the roughness of the public flue, the total number of power-on terminals, and the total number of floors. The calculation formulas for frictional resistance and combined resistance are generally empirically fitted and are not further explained or limited here.

[0075] Generally speaking, terminals on different floors operate at different gears when reaching the preset exhaust volume. This is because terminals on different floors experience different exhaust resistances, and therefore require different exhaust power. When exhaust resistance increases, the terminal's operating gear needs to be increased to increase exhaust power and achieve the preset exhaust volume. Therefore, the exhaust power provided by the terminal can be determined by obtaining the terminal's operating gear. The actual exhaust resistance can then be calculated by calculating the difference between the exhaust resistance (i.e., the sum of friction resistance and combined resistance) and the exhaust power.

[0076] It is understandable that the gears in the terminal are limited. When the exhaust resistance increases, the terminal's operating gear can be increased to the maximum gear at most. If the exhaust resistance is still greater than the terminal's exhaust power at this time, it means that the terminal is still unable to overcome the exhaust resistance when it is increased to the maximum gear. The actual exhaust resistance is greater than zero, and the host needs to be turned on for auxiliary exhaust.

[0077] Figure 3 This is a flow chart of another control method of a central range hood system provided by an embodiment of the present invention, which further supplements the control method after the host is turned on, and the rest of the similarities are not repeated here. Figure 3 As shown, the control method specifically includes the following steps:

[0078] S201: Receive a power on / off signal from a terminal, and determine a terminal in a power on state as a power on terminal.

[0079] S202: Acquire the operating condition information of the powered-on terminals, and calculate the actual exhaust resistance of each powered-on terminal under a preset exhaust volume according to the operating condition information.

[0080] S203: Determine the maximum exhaust resistance among the actual exhaust resistances.

[0081] S204: Determine whether the maximum exhaust air volume is less than or equal to zero. If so, execute S205; if not, execute S207.

[0082] S205: Control the host to shut down and execute S206.

[0083] S206 , controlling the opening angle of the power distribution valve corresponding to each power-on terminal to be 90°.

[0084] Generally, when the power distribution valve's opening angle is 0° (the valve surface is perpendicular to the pipeline's extension direction), the power distribution valve is closed. When the power distribution valve's opening angle is 90° (the valve surface is parallel to the pipeline's extension direction), the power distribution valve is fully open. Controlling the power distribution valve's opening angle allows for resistance adjustment. In this embodiment, when the host computer is turned off, controlling the corresponding valve opening angle of each powered terminal to 90° reduces exhaust resistance, thereby reducing the exhaust power required by the terminal and lowering its power consumption, achieving energy-saving effects.

[0085] S207: Control the host to start up and execute S208.

[0086] S208. Determine and adjust the target operating frequency of the host according to the maximum exhaust resistance and the total exhaust volume.

[0087] Among them, the total exhaust volume is the sum of the exhaust volumes of all powered-on terminals. The target operating frequency is the operating frequency that the host needs to reach while ensuring that the exhaust power (i.e., auxiliary exhaust power) provided by the host can overcome the maximum exhaust resistance and ensure that each terminal can reach the preset exhaust volume. The operating frequency of the host corresponds to the exhaust power provided by the host. By adjusting the operating frequency of the host, the exhaust power provided by the host can be adjusted. According to the above, the maximum exhaust resistance can represent the auxiliary exhaust power demand provided by the host, and specifically can represent the minimum value of the auxiliary exhaust power demand. Therefore, after the host is turned on, the operating frequency of the host can be determined based on the maximum exhaust resistance and the total exhaust volume, so as to save power consumption while meeting the exhaust volume demand.

[0088] Optionally, the operating condition information includes a preset exhaust volume and the total number of powered-on terminals. S208 may specifically include the following steps:

[0089] a. Calculate the total exhaust volume based on the preset exhaust volume and the total number of powered-on terminals;

[0090] b. Determine the target function relationship in the function relationship cluster of the preset operating frequency, host exhaust power and system exhaust volume based on the maximum exhaust resistance and total exhaust volume, and determine the target operating frequency based on the target function relationship;

[0091] c. Adjust the host's operating frequency to the target operating frequency.

[0092] The total exhaust volume is equal to the product of the preset exhaust volume and the total number of powered-on terminals.

[0093] For example, Figure 4 It is a curve diagram of a cluster of functional relationships among the host exhaust power, system exhaust volume, and host operating frequency provided by an embodiment of the present invention. Figure 4 In the figure, the ordinate P represents the main engine exhaust power (i.e., auxiliary exhaust power), and the abscissa Q represents the system exhaust volume, i.e., the total exhaust volume of the system under a given operating condition. As can be seen from the figure, different curves correspond to different main engine operating frequencies (such as R1, R2, and R3). This indicates that a cluster of functional relationships exists between operating frequency, main engine exhaust power, and system exhaust volume. Different functional relationships within this cluster correspond to different curves, i.e., to different operating frequencies.

[0094] Furthermore, the maximum exhaust resistance (ΔP max ) is the exhaust power that the host needs to provide, and the total exhaust volume (M*Qz, M represents the number of powered-on terminals, Qz represents the preset exhaust volume) is the system exhaust volume. Therefore, the coordinate point (M*Qz, ΔP max ) is a point on one of the curves. Therefore, a target curve can be determined according to the maximum exhaust resistance and the total exhaust volume. The target curve corresponds to the target function relationship f(M*Qz, ΔP max , R), and then the target operating frequency of the host can be determined according to the objective function relationship. Figure 4 (M*Qz, ΔP max ) is an example of a point on the curve corresponding to the operating frequency R2. Therefore, the operating frequency of the host can be adjusted to R2.

[0095] It should be noted that different operating frequencies correspond to different curves. Figure 4 The three curves are merely used as examples for illustration and do not constitute a limitation to the present invention.

[0096] After the control host is turned on, the embodiment of the present invention determines and adjusts the target operating frequency of the host according to the maximum exhaust resistance and the total exhaust volume, which can achieve the effect of saving power consumption while meeting the exhaust volume requirement.

[0097] Figure 5 This is a flow chart of another control method of a central range hood system provided by an embodiment of the present invention, which further supplements the control method after the host is turned on, and the rest of the similarities are not repeated here. Figure 5 As shown, the control method specifically includes the following steps:

[0098] S301: Receive a power on / off signal from a terminal, and determine a terminal in a power on state as a power on terminal.

[0099] S302: Acquire the operating condition information of the powered-on terminals, and calculate the actual exhaust resistance of each powered-on terminal under a preset exhaust volume according to the operating condition information.

[0100] S303: Determine the maximum exhaust resistance among the actual exhaust resistances.

[0101] S304: Determine whether the maximum exhaust air volume is less than or equal to zero. If so, execute S305; if not, execute S307.

[0102] S305: Control the host to shut down and execute S306.

[0103] S306 , controlling the opening angle of the power distribution valve corresponding to each power-on terminal to be 90°.

[0104] S307: Control the host to start up and execute S308.

[0105] S308: Calculate and adjust the target valve opening angle of the power distribution valve corresponding to the terminal according to the maximum exhaust resistance and the actual exhaust resistance of the terminal.

[0106] The target valve opening angle is the angle at which the power distribution valve is to be opened under the current working conditions.

[0107] Based on the above content, it can be seen that resistance can be adjusted by controlling the opening angle of the power distribution valve. Therefore, when the host provides auxiliary exhaust power, the opening angle of the power distribution valve corresponding to the terminal can be adjusted according to the maximum exhaust resistance and the actual exhaust resistance of the terminal before the host is turned on, so as to achieve relative balance of exhaust volume for different terminals.

[0108] Specifically, for terminals with a relatively small actual exhaust resistance, the opening angle of the power distribution valve corresponding to the terminal can be made smaller to appropriately increase the exhaust resistance of the terminal, so that the exhaust power corresponding to the terminal (the exhaust power provided by the host and the terminal) is balanced with the exhaust resistance (friction resistance, confluence resistance, and resistance generated by the power distribution valve) to achieve a preset exhaust volume. Similarly, for terminals with a relatively large actual exhaust resistance, the opening angle of the power distribution valve corresponding to the terminal can be made larger to appropriately reduce the exhaust resistance of the terminal, so that the exhaust power and exhaust resistance corresponding to the terminal are balanced to achieve a preset exhaust volume, thereby achieving relative balance in exhaust volume for different terminals.

[0109] It should be noted that when the preset exhaust volume changes, the actual exhaust resistance and the maximum exhaust resistance will change, thereby affecting the value of the valve opening angle. This embodiment is only described by taking the preset exhaust volume as an example.

[0110] Optionally, S308 specifically includes the following steps:

[0111] a. Calculate the difference between the maximum exhaust resistance and the actual exhaust resistance of the terminal;

[0112] b. Based on the preset functional relationship between the relative resistance difference and the valve opening angle, and the resistance difference, the target valve opening angle of the power distribution valve corresponding to the terminal is calculated;

[0113] c. Adjust the valve opening angle of the power distribution valve corresponding to the terminal to the target valve opening angle.

[0114] The relative resistance difference represents the difference between the terminal's actual exhaust resistance and its maximum exhaust resistance. A larger difference indicates a smaller actual exhaust resistance before the host is turned on, while a smaller difference indicates a larger actual exhaust resistance before the host is turned on. Furthermore, as previously mentioned, a larger relative resistance difference indicates a smaller target opening angle for the power distribution valve, and a smaller relative resistance difference indicates a larger target opening angle for the power distribution valve.

[0115] For example, Figure 6 3 is a schematic diagram of a curve showing the functional relationship between the relative resistance difference and the valve opening angle provided by an embodiment of the present invention. The curve or functional relationship can be obtained by pre-fitting. Figure 6 In the equation, the ordinate ΔP represents the relative resistance difference, and the abscissa θ represents the power distribution valve opening angle. Specifically, after calculating the difference between a terminal's actual exhaust resistance and its maximum exhaust resistance, the target opening angle of the corresponding power distribution valve can be calculated based on this functional relationship. The power distribution valve opening angle corresponding to that terminal is then adjusted to the target opening angle.

[0116] After the host is turned on, the embodiment of the present invention calculates and adjusts the target valve opening angle of the power distribution valve corresponding to the terminal according to the maximum exhaust resistance and the exhaust resistance of the terminal. After the host is turned on to provide auxiliary exhaust power, the opening angle of the power distribution valve can be adjusted to achieve relative balance of the exhaust volume of different terminals.

[0117] It should be noted that Figure 3 and Figure 5 Taking adjusting the host operating frequency and adjusting the opening angle of the power distribution valve after turning on the host as examples, the control method of the central range hood system provided by the embodiment of the present invention is further described in detail. In other embodiments, such as Figure 7 The specific flow chart of a control method for a central range hood system provided by an embodiment of the present invention is shown. After the host is turned on, the operating frequency of the host and the opening angle of the power distribution valve can be adjusted.

[0118] Specifically, such as Figure 7As shown, the power distribution valves in the system can be numbered from floor 1 to floor N to simplify the execution of the control method. The host and each power distribution valve can form a network for communication. In this way, after detecting the power on / off signal of the terminal, the power distribution valve can broadcast the power on / off signal of the terminal to the system, allowing the host to determine the powered-on terminal. In addition, the host can also obtain the operating condition information of the terminal through the power distribution valve, and then calculate the system exhaust resistance ΔP of each powered-on terminal at a preset exhaust volume Qz under a certain operating condition. i (i.e. the actual exhaust resistance mentioned above, where i represents the number of the corresponding power distribution valve), and calculate the maximum value ΔP max Furthermore, the maximum exhaust resistance ΔP max Determine whether to turn on the host. Specifically, if ΔP max If the value is less than 0, the host is shut down and the opening angle of the power distribution valves corresponding to all powered-on terminals is controlled to 90°. If not, the power distribution valve is opened and the operating frequency of the host and the opening angle of each power distribution valve are determined. The specific method is not described here, please refer to the above description.

[0119] Based on the same inventive concept, an embodiment of the present invention further provides a control device for a central range hood system. Figure 8 FIG. 1 is a schematic diagram of a control device for a central range hood system according to an embodiment of the present invention. Figure 8 As shown, the control device includes a signal receiving module 401, a calculation module 402, a comparison module 403 and a control module 404, wherein the signal receiving module 401 is used to receive the power on / off signal of the terminal and determine the terminal in the power on state as the powered on terminal; the calculation module 402 is used to obtain the working condition information of the powered on terminal and calculate the actual exhaust resistance of each powered on terminal under a preset exhaust volume based on the working condition information; the comparison module 403 is used to determine the maximum exhaust resistance among the actual exhaust resistances; and the control module 404 is used to control the host to be powered off when the maximum exhaust resistance is less than or equal to zero, otherwise control the host to be powered on.

[0120] The control device for the central range hood system provided by the embodiment of the present invention has the same beneficial effects as the above-mentioned control method, which will not be described in detail here.

[0121] Based on the above embodiment, optionally, after the control host is turned on, the control module 404 is also used to: determine and adjust the target operating frequency of the host according to the maximum exhaust resistance and the total exhaust volume; and / or, calculate and adjust the target valve opening angle of the power distribution valve corresponding to the terminal according to the maximum exhaust resistance and the actual exhaust resistance of the terminal.

[0122] Optionally, the control module 404 includes a first control unit, which is specifically used to: calculate the total exhaust volume based on the preset exhaust volume and the total number of powered-on terminals; determine the target function relationship in the functional relationship cluster of the preset operating frequency, host exhaust power and system exhaust volume based on the maximum exhaust resistance and the total exhaust volume, and determine the target operating frequency based on the target function relationship; and adjust the operating frequency of the host to the target operating frequency.

[0123] Optionally, the control module 404 includes a second control unit, which is specifically used to: calculate the resistance difference between the maximum exhaust resistance and the actual exhaust resistance of the terminal; calculate the target valve opening angle of the power distribution valve corresponding to the terminal based on the preset functional relationship between the relative resistance difference and the valve opening angle, and the resistance difference; and adjust the valve opening angle of the power distribution valve corresponding to the terminal to the target valve opening angle.

[0124] Optionally, after the control host is turned off, the control module 404 is further configured to control the power distribution valve corresponding to each powered-on terminal to open at an angle of 90°.

[0125] Optionally, the operating condition information includes: a preset exhaust volume, the floor where each powered-on terminal is located, the cross-sectional area of the public flue, the roughness of the public flue, the total number of powered-on terminals, the total number of floors, and the operating gear of each powered-on terminal; the calculation module 402 is specifically used to: calculate the friction resistance and confluence resistance of the powered-on terminal at the preset exhaust volume based on the preset exhaust volume, the floor where each powered-on terminal is located, the cross-sectional area of the public flue, the roughness of the public flue, the total number of powered-on terminals, and the total number of floors; determine the exhaust power of the powered-on terminal at the preset exhaust volume based on the operating gear of the powered-on terminal; and calculate the actual exhaust resistance of the powered-on terminal at the preset exhaust volume based on the friction resistance, confluence resistance, and exhaust power.

[0126] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A control method for a central range hood system, characterized in that: include: Receiving a power-on / off signal from a terminal, and determining a terminal in a power-on state as a power-on terminal; Obtaining operating condition information of the powered-on terminals, and calculating, based on the operating condition information, an actual exhaust resistance of each powered-on terminal at a preset exhaust volume; the actual exhaust resistance being the difference between the exhaust resistance experienced by the powered-on terminal and the exhaust power provided by the powered-on terminal; determining a maximum exhaust resistance among the actual exhaust resistances; When the maximum exhaust resistance is less than or equal to zero, the host is controlled to be turned off; otherwise, the host is controlled to be turned on.

2. The control method according to claim 1, characterized in that: The operating condition information includes: the preset exhaust volume, the floor where each of the powered-on terminals is located, the cross-sectional area of the common flue, the roughness of the common flue, the total number of powered-on terminals, the total number of floors, and the operating gear of each of the powered-on terminals; Calculating the actual exhaust resistance of each powered-on terminal at a preset exhaust volume according to the operating condition information includes: Calculate the friction resistance and confluence resistance of the powered-on terminals at the preset exhaust volume according to the preset exhaust volume, the floors where the powered-on terminals are located, the cross-sectional area of the common flue, the roughness of the common flue, the total number of powered-on terminals, and the total number of floors; Determining the exhaust power of the powered-on terminal at the preset exhaust volume according to the operating gear of the powered-on terminal; The actual exhaust resistance of the powered-on terminal at the preset exhaust volume is calculated based on the friction resistance, the confluence resistance, and the exhaust power.

3. The control method according to claim 1, characterized in that: After the control host is turned on, the control method further includes: The target operating frequency of the host is determined and adjusted according to the maximum exhaust resistance and the total exhaust volume.

4. The control method according to claim 3, characterized in that: The working condition information includes the preset exhaust volume and the total number of the powered-on terminals; Determining and adjusting a target operating frequency of the host according to the maximum exhaust resistance and the total exhaust volume includes: Calculating the total exhaust volume according to the preset exhaust volume and the total number of powered-on terminals; Determining a target function relationship in a preset functional relationship cluster of operating frequency, host exhaust power, and system exhaust volume according to the maximum exhaust resistance and the total exhaust volume, and determining the target operating frequency based on the target function relationship; The operating frequency of the host is adjusted to the target operating frequency.

5. The control method according to claim 1, characterized in that: After the control host is turned on, the control method further includes: According to the maximum exhaust resistance and the actual exhaust resistance of the terminal, a target valve opening angle of the power distribution valve corresponding to the terminal is calculated and adjusted.

6. The control method according to claim 5, characterized in that: Calculating and adjusting the valve opening angle of the power distribution valve corresponding to the terminal according to the maximum exhaust resistance and the actual exhaust resistance of the terminal, including: Calculating a resistance difference between the maximum exhaust resistance and the actual exhaust resistance of the terminal; Calculating a target valve opening angle of the power distribution valve corresponding to the terminal based on a preset functional relationship between the relative resistance difference and the valve opening angle and the resistance difference; The valve opening angle of the power distribution valve corresponding to the terminal is adjusted to the target valve opening angle.

7. The control method according to claim 1, characterized in that: After controlling the host to shut down, the control method further includes: The power distribution valve corresponding to each power-on terminal is controlled to open at an angle of 90°.

8. A control device for a central range hood system, characterized in that: include: A signal receiving module, configured to receive a power-on / off signal from a terminal and determine a terminal in a power-on state as a power-on terminal; a calculation module, configured to obtain operating condition information of the powered-on terminals and calculate, based on the operating condition information, an actual exhaust resistance of each powered-on terminal at a preset exhaust volume; the actual exhaust resistance being the difference between the exhaust resistance experienced by the powered-on terminal and the exhaust power provided by the powered-on terminal; a comparison module, configured to determine a maximum exhaust resistance among the actual exhaust resistances; The control module is used to control the host to be turned off when the maximum exhaust resistance is less than or equal to zero, and to control the host to be turned on otherwise.

9. The control device according to claim 8, characterized in that After the control host is turned on, the control module is also used to: determining and adjusting the target operating frequency of the host according to the maximum exhaust resistance and the total exhaust volume; and / or, According to the maximum exhaust resistance and the actual exhaust resistance of the terminal, a target valve opening angle of the power distribution valve corresponding to the terminal is calculated and adjusted.

10. A central range hood system, characterized in that: include: Multiple terminals; A plurality of power distribution valves are provided in a one-to-one correspondence with the terminals and are in communication connection with each other; The power distribution valve is used to detect the working condition information of the terminal; a host computer, connected to the power distribution valves for communication to obtain the operating condition information; The host is used to execute the control method according to any one of claims 1 to 7.

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