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

Abstract

This application discloses a control method, device, system, and computer-readable storage medium for a central range hood system. The method includes: dynamically detecting and determining a target terminal range hood in a preset operating state among each terminal range hood; determining the sub-demand exhaust air volume and total demand exhaust air volume for each target terminal range hood based on the height from the exhaust hood to the smoke source, the suction and capture speed, the duct leakage rate, and the exhaust hood smoking side length of each target terminal range hood; controlling the operating parameters of the main fan to allocate the total demand exhaust air volume for the common flue, and allocating the sub-demand exhaust air volume for each target terminal range hood based on the opening and closing degree of the power distribution valve of each target terminal range hood controlled by a slave controller. This application improves the accuracy of exhaust air volume distribution in the central range hood system and better meets the actual user demand for exhaust air volume from the terminal range hoods.

Description

Technical Field

[0001] The present invention relates to the field of intelligent control of central range hoods, and in particular to a control method, device, system and computer-readable storage medium for a central range hood system. Background Art

[0002] With the improvement of people's living standards, range hoods have become a must-have appliance in every kitchen. Range hoods generally have different exhaust settings to meet different exhaust volume requirements in different kitchen usage scenarios. For example, when cooking soup or steaming food, there is less oil smoke, so the required exhaust volume is smaller and the exhaust setting is lower. However, when stir-frying or frying, there is more oil smoke, so the exhaust volume is larger and the exhaust setting is higher.

[0003] However, as urban residential buildings rise in height, people's demands for residential comfort are becoming increasingly demanding. Newly built high-rise residential buildings generally adopt centralized exhaust systems, meaning a central range hood system within each building provides overall exhaust suction for the building's shared flue. However, current central range hood systems typically determine the overall exhaust volume required by the system based on the activation rate or number of range hoods in each floor's kitchens. This airflow is then evenly distributed among the activated range hoods in each kitchen. This configuration and distribution scheme takes only a limited number of factors into account, leading to inaccurate exhaust volume distribution and technical issues that fail to meet actual user needs. Summary of the Invention

[0004] The main purpose of this application is to provide a control method, device, system and computer-readable storage medium for a central range hood system, aiming to solve the technical problem that the exhaust volume distribution of the central range hood system is inaccurate and does not meet the actual needs of users.

[0005] To achieve the above-mentioned objectives, the present application provides a control method for a central range hood system, the central range hood system comprising a main fan, a terminal range hood, a power distribution valve, a master control module, and a slave controller, wherein the main fan is disposed at the top of a common flue of a building, a plurality of the terminal range hoods are located on each floor of the building and are connected to the common flue, the power distribution valve is disposed in a connection passage between each terminal range hood and the common flue, the slave controller is electrically connected to the power distribution valve, and the master control module is communicatively connected to the main fan and the slave controller respectively;

[0006] The control method of the central range hood system is applied to the main control module, and the method comprises the following steps:

[0007] Dynamically detecting and determining a target terminal range hood in a preset working state among the terminal range hoods;

[0008] Determine the sub-required exhaust air volume and the total required exhaust air volume of each target terminal range hood according to the height from the exhaust hood to the smoke source, the suction and capture speed, the duct leakage rate, and the exhaust hood side length of each target terminal range hood;

[0009] Control the operating parameters of the main fan to configure the total required exhaust air volume for the common flue, and control the opening and closing degree of the power distribution valve of each target terminal range hood based on the slave controller to configure the sub-required exhaust air volume for each target terminal range hood.

[0010] Optionally, after the step of dynamically detecting and determining the target terminal range hood in a preset working state among the terminal range hoods, the method further comprises:

[0011] Based on the distance sensor provided on each of the target terminal range hoods, detecting the height H from the exhaust hood to the smoke source;

[0012] Based on the smoke sensor and temperature sensor provided on each of the target terminal range hoods, respectively detecting the cooking fume concentration and fume temperature of the environment in which each of the target terminal range hoods is located, and determining the suction and capture speed V of each of the target terminal range hoods according to the cooking fume concentration and fume temperature;

[0013] Obtaining the pipeline air leakage rate K of the central range hood system, with a value ranging from 1.1 to 1.2;

[0014] Based on the equipment model of each target terminal range hood, the smoke-absorbing side length P of the exhaust hood of each target terminal range hood is determined, where P is the total length of the outer edge of the exhaust hood not against the wall.

[0015] Optionally, the step of determining the sub-required exhaust air volume and the total required exhaust air volume of each target terminal range hood according to the height from the exhaust hood to the smoke source, the suction and capture speed, the duct leakage rate, and the exhaust hood side length of each target terminal range hood includes:

[0016] Apply the formula Qn = a*V*P*H*K*3600 to obtain the sub-required exhaust air volume Qn of each target terminal range hood. The total required exhaust air volume = Q1 + Q2 + ... + Qn;

[0017] Among them, a takes a value of 1.3 to 1.5; n is the number of range hoods in the current target terminal, and n is a positive integer; Qn is the required exhaust volume of the range hoods in the target terminal, in cubic meters per hour; V is the suction speed of the range hoods in the target terminal, in meters per second; P is the smoke-absorbing side length P of the exhaust hood of the range hood in the target terminal, in meters; H is the height from the exhaust hood of the range hood in the target terminal to the smoke source, in meters; K is the pipe leakage rate of each range hood in the target terminal.

[0018] Optionally, the temperature sensor is multiple and is respectively arranged at the air inlet and outer surface of the exhaust hood of each target terminal range hood to determine the detection point temperature and the ambient temperature, and the fume temperature is the difference between the detection point temperature and the ambient temperature;

[0019] The step of determining the suction speed V of each target terminal range hood according to the cooking fume concentration and the fume temperature includes:

[0020] The cooking fume concentration and fume temperature of each group are input into a preset algorithm model to determine the suction speed V of each target terminal range hood, wherein the greater the cooking fume concentration, the greater the suction speed V; the greater the fume temperature, the greater the suction speed V.

[0021] Optionally, a wind speed sensor and a wind pressure sensor are provided in the connection passage between each of the terminal range hoods and the common flue, for detecting the actual pipe flow velocity and the actual pipe wind pressure in the connection passage;

[0022] After the steps of controlling the operating parameters of the main fan to configure the total required exhaust air volume for the common flue, and controlling the opening and closing degree of the power distribution valve of each target terminal range hood based on the slave controller to configure the sub-required exhaust air volume for each target terminal range hood, the method further includes:

[0023] Divide the sub-required exhaust air volume of each target terminal range hood by the pipe cross-sectional area of ​​the corresponding connecting channel to determine the ideal pipe flow rate;

[0024] comparing the actual pipeline flow rate with the ideal pipeline flow rate, and if the actual pipeline flow rate is less than the ideal pipeline flow rate, increasing the opening of the power distribution valve in the connecting channel where the actual pipeline flow rate is less than the ideal pipeline flow rate, and adaptively increasing the speed of the main fan;

[0025] Alternatively, the sub-required exhaust air volume of each target terminal range hood is divided by the pipe cross-sectional area of ​​the corresponding connecting channel to determine the ideal pipe flow rate;

[0026] Based on the formula wp = 0.5·ro·v1*v1 and the ideal duct flow rate, determine the ideal duct wind pressure, where wp is the ideal duct wind pressure in kN / m2; ro is the air density in kg / m3; and v1 is the ideal duct flow rate in m / s.

[0027] Compare the actual pipeline wind pressure with the ideal pipeline wind pressure. If the actual pipeline wind pressure is lower than the ideal pipeline wind pressure, increase the opening of the power distribution valve in the connecting channel where the actual pipeline wind pressure is lower than the ideal pipeline wind pressure, and increase the speed of the main fan accordingly.

[0028] Optionally, after the step of correspondingly determining the sub-required exhaust air volume and the total required exhaust air volume of each target terminal range hood, the method further comprises:

[0029] Obtaining the floor where each target terminal range hood is located;

[0030] The sub-demand exhaust air volume of the target terminal range hood located in the preset high floor range is corrected downward to update the sub-demand exhaust air volume. The larger the floor, the greater the correction amplitude.

[0031] The sub-demand exhaust air volume of the target terminal range hoods located in the preset lower floor range is corrected upward to update the sub-demand exhaust air volume. The larger the floor, the greater the correction amplitude.

[0032] Optionally, after the step of obtaining the floor on which each of the target terminal range hoods is located, the method further comprises:

[0033] Determine whether the sub-demand exhaust air volume of the target terminal range hood whose floor is in the preset high floor interval is less than or equal to the preset minimum threshold; if so, set the sub-demand exhaust air volume of the target terminal range hood whose floor is in the preset high floor interval to the preset minimum threshold.

[0034] The present application also provides a control device for a central range hood system, which is an implementation carrier of the control module in the control method for the central range hood system, and the control device includes:

[0035] a working state detection module, configured to dynamically detect and determine a target terminal range hood in a preset working state among the terminal range hoods;

[0036] an exhaust volume determination module for determining the sub-required exhaust volume and the total required exhaust volume of each target terminal range hood according to the height from the exhaust hood to the smoke source, the suction and capture speed, the duct leakage rate, and the exhaust hood side length of each target terminal range hood;

[0037] The exhaust volume control module is used to control the operating parameters of the main fan, configure the total required exhaust volume for the common flue, and control the opening and closing degree of the power distribution valve of each target terminal range hood based on the slave controller to configure the sub-required exhaust volume for each target terminal range hood.

[0038] The present application also provides a central range hood system, which includes: a main fan, a terminal range hood, a power distribution valve, a main control module and a slave controller, wherein the main fan is arranged at the top of the public flue of the building, and multiple terminal range hoods are located on each floor of the building and connected to the public flue, the power distribution valve is arranged in the connecting channel between each terminal range hood and the public flue, the slave controller is electrically connected to the power distribution valve, and the main control module is communicatively connected to the main fan and the slave controller respectively; the main control module is a processor, and the central range hood system also includes: a memory, a computer program stored in the memory and executable on the processor, and the computer program is configured to implement the steps of the control method of the central range hood system as described above.

[0039] The present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the control method of the central range hood system as described above are implemented.

[0040] This application dynamically detects the target terminal range hoods in working state to know the number of target terminal range hoods and which specific users are using them. Furthermore, based on the height from the exhaust hood to the smoke source, the suction and capture speed, the pipe air leakage rate and the smoking side length of the exhaust hood in the actual use scenario of each target terminal range hood, the sub-demand exhaust air volume actually required by each target terminal range hood is calculated, and then the total demand exhaust air volume that meets the current actual demand is determined based on each sub-demand exhaust air volume, instead of just considering the number of target terminal range hoods in working state. Multiple important factors that determine the exhaust air volume demand in the actual usage scenarios of the target terminal range hoods are considered more. Then, based on the opening and closing degree of the power distribution valve of each target terminal range hood controlled by the slave controller, a sub-demand exhaust air volume is configured for each target terminal range hood. The exhaust air volume demand in the current actual usage scenarios of each target terminal range hood is considered in a targeted manner, and the current actual exhaust air volume demand of each target terminal range hood is accurately evaluated, which greatly improves the exhaust air volume distribution accuracy of the central range hood system and better meets the actual demand of users for the exhaust air volume of terminal range hoods. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0043] Figure 1 A schematic structural diagram of a central range hood system according to an embodiment of the present application;

[0044] Figure 2 This is a flow chart of an embodiment of a control method for a central range hood system of the present application;

[0045] Figure 3 This is a flow chart of another embodiment of the control method of the central range hood system of the present application;

[0046] Figure 4 This is a schematic diagram of the framework structure of an embodiment of a central range hood system according to an embodiment of the present application;

[0047] Figure 5 This is a schematic diagram of the framework structure of the control device of the central range hood system involved in the embodiment of the present application.

[0048] The purpose, features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0049] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0050] Reference Figure 1 , Figure 1 This is a schematic diagram of the framework structure of the central range hood system involved in the embodiment of the present application. The central range hood system includes a main fan 1, a terminal range hood 2, a power distribution valve 3, a main control module (not shown in the figure) and a slave controller (not shown in the figure); the main fan 1 is set at the top of the public flue 4 of the building, and multiple terminal range hoods 2 are located on each floor of the building and connected to the public flue 4; the power distribution valve 3 is set in the connection channel 5 between each terminal range hood 2 and the public flue 4; the slave controller is electrically connected to the power distribution valve 3, and the main control module is communicated with the main fan 1 and the slave controller respectively. Figure 1 , Fn represents the nth floor of a building, and F1 represents the 1st floor of a building.

[0051] The main fan of the central range hood system is a powerful fan, which is generally integrated with an air purification module. The main fan is installed at the public flue outlet on the roof of the residential building, and provides auxiliary exhaust suction to the public flue. The air purification module filters and purifies the oil fume gas discharged from the public flue through the main fan, and the exhaust gas meets environmental protection requirements.

[0052] A terminal range hood is installed in the kitchen of each renovated suite on each floor. Each terminal range hood is connected to a public flue. For example, the terminal range hood has its own sub-fan. The terminal range hood includes a body and an exhaust hood. The sub-fan is installed in the body, and the exhaust hood is installed at the end of the connecting channel connected to the public flue. A power distribution valve is installed in the connecting channel connected to the public flue. The opening of the power distribution valve determines the exhaust volume of the terminal range hood it is connected to. The larger the opening of the power distribution valve, the greater the exhaust volume supplied to the terminal range hood. The smaller the opening of the power distribution valve, the smaller the exhaust volume supplied to the terminal range hood. The opening of the power distribution valve is controlled by a slave controller, and the slave controller is controlled by the main control module. For example, the slave controller and the main control module form a network to achieve mutual communication.

[0053] The main control module can be an electronic component such as an MCU (Microcontroller Unit) or a CPU (Central Processing Unit), and can be arranged in a control cabinet or an external unit of the central range hood system.

[0054] The present application provides a control method for a central range hood system, which is applied to the main control module. Figure 2 , the control method comprises the following steps:

[0055] Step S10, dynamically detecting and determining a target terminal range hood in a preset working state among the terminal range hoods;

[0056] The main control module continuously detects the equipment status of each terminal range hood in the central range hood system. The equipment status includes a preset working status and a shutdown status. For example, the equipment status can be identified by detecting the power-on current of the terminal range hood. For example, if the power-on current is greater than the preset current value, it is determined that the terminal range hood is in the working state; for example, the airflow speed of the connecting channel to which the terminal range hood is connected can be detected. A small pendulum or a wind speed sensor can be set in the connecting channel and electrically connected to the slave controller. For example, if the airflow speed is greater than the preset speed value, it is determined that the terminal range hood is in the working state.

[0057] Exemplarily, a terminal range hood in a preset working state is set as a target terminal range hood, which turns on the device for the user and is used to exhaust kitchen fumes, rather than using the terminal range hood for lighting and air purification.

[0058] Step S20, determining the sub-demand exhaust air volume and the total demand exhaust air volume of each target terminal range hood according to the height from the exhaust hood to the smoke source, the suction and capture speed, the duct leakage rate, and the exhaust hood smoking side length of each target terminal range hood; Figure 1 The exhaust hood 21 is a part of the terminal range hood 2.

[0059] Exemplarily, the height from the exhaust hood of the target terminal range hood to the smoke source is the distance between the exhaust hood and the cooking utensils currently being used for cooking, such as woks, steamers, and frying pans. Exemplarily, the suction speed is the exhaust airflow speed that the user currently needs to exhaust the oil smoke in the current cooking scene. Exemplarily, the duct leakage rate is difficult to ensure 100% air tightness due to the air tightness issues between the terminal range hood and the connecting channel, the connecting channel and the public flue, and the public flue and the main fan. Generally, there will be a small amount of air leakage in the duct. This duct leakage rate is a correction parameter set for the air tightness problem. Exemplarily, the exhaust hood smoking side length is the sum of the outer edge lengths of the non-wall-facing portion of the exhaust hood of the terminal range hood.

[0060] Optionally, refer to Figure 3 After step S10 and before step S20, the control method of the central range hood system of the present application further includes:

[0061] Step A1: detecting the height H between the exhaust hood and the smoke source based on a distance sensor provided on each of the target terminal range hoods;

[0062] For example, a distance sensor, which can be an infrared distance sensor, is installed on the side of the exhaust hood of the target terminal range hood facing the gas stove. This distance sensor accurately and in real time measures the height H between the exhaust hood of each target terminal range hood and the smoke source. This embodiment specifically considers the differences in the height of terminal range hood installations in each household and the need for height adjustment during use. The actual height H between the exhaust hood and the smoke source serves as an important reference for subsequently determining the sub-demand exhaust air volume and the total required exhaust air volume for each target terminal range hood. For example, the height H between the exhaust hood and the smoke source is directly proportional to the sub-demand exhaust air volume.

[0063] Step A2: Based on the fume sensor and temperature sensor provided on each of the target terminal range hoods, respectively detecting the cooking fume concentration and temperature of the environment in which each of the target terminal range hoods is located, and determining the suction speed V of each of the target terminal range hoods according to the cooking fume concentration and temperature;

[0064] Exemplarily, the smoke sensor and the temperature sensor are arranged on the surface of the exhaust hood of the terminal range hood. For example, the smoke sensor and the temperature sensor can be arranged on the side of the exhaust hood of the terminal range hood facing the gas stove. When the smoke is discharged into the public flue, it will inevitably pass through the location of the smoke sensor and the temperature sensor, thereby improving the detection accuracy of the smoke sensor and the temperature sensor on the cooking fume concentration and the fume temperature.

[0065] For example, a smoke sensor, a type of gas sensor, can be an infrared gas sensor that detects the concentration of cooking fumes between the stove and the exhaust hood. The basic principle of an infrared gas sensor is as follows: a transmitter and a receiver are located within the internal channel of the infrared gas sensor. The transmitter emits infrared light waves, which scatter when they strike cooking fume particles. The receiver collects the light and compares the changes before and after the light to calculate the cooking fume concentration value, thereby obtaining the cooking fume concentration in the environment where the target terminal range hood is located.

[0066] Exemplarily, the smoke sensor is a sieve sensor, which can be set on the air inlet side of the exhaust hood. When the oil fume particles pass through the sensor, they encounter resistance when passing through the holes of the sieve, pushing the sieve, thereby affecting the change of current intensity. The greater the current intensity, the greater the oil fume concentration. According to the comparison curve between the two, the oil fume concentration is calculated using the current intensity, that is, the cooking oil fume concentration of the environment where the target terminal range hood is located is obtained.

[0067] Exemplarily, the temperature sensor is a contact temperature sensor, the detection portion of the temperature sensor is in good contact with the object to be measured, and is used to detect the temperature of the oil smoke passing through the exhaust hood.

[0068] For example, the cooking fume concentration and fume temperature are both directly proportional to the suction speed V of the target terminal range hood. This is because the higher the cooking fume concentration, the more likely the user is to turn on the sub-fan of the target terminal range hood to a higher speed gear, and thus the suction speed of the target terminal range hood is faster. Similarly, a higher fume temperature indicates that the user is currently using high-oil-fume cooking methods such as stir-frying and frying, and the user is more likely to turn on the sub-fan of the target terminal range hood to a higher speed gear, and thus the suction speed of the target terminal range hood is faster.

[0069] Step A3, obtaining the pipeline air leakage rate K of the central range hood system, with a value ranging from 1.1 to 1.2;

[0070] For example, the duct leakage rate is used to compensate for the airtightness problems between the terminal range hood and the connecting channel, the connecting channel and the public flue, and the public flue and the main fan in the central range hood system. That is, even if the central range hood system is installed according to the standards, there will be a certain amount of erroneous air leakage. The duct leakage rate is a compensatory correction for the required exhaust air volume due to this erroneous air leakage.

[0071] Step A4: determining the smoke-intake side length P of the exhaust hood of each target terminal range hood based on the equipment model of each target terminal range hood, where P is the total length of the outer edge of the exhaust hood not against the wall.

[0072] The device model of each terminal range hood is typically stored in a memory associated with the main control module at the location where the central range hood system is installed. The device model is typically associated with and stored in the terminal range hood's exhaust hood side length. Furthermore, based on the device model of each target terminal range hood, the exhaust hood side length P of each target range hood can be determined. P is the total length of the hood's non-wall-facing outer edge. A larger exhaust hood side length P indicates a larger exhaust hood cross-section and greater exhaust potential.

[0073] For example, the height from the exhaust hood to the smoke source, the suction speed, the duct leakage rate and the smoking side length of the exhaust hood of the target terminal range hood are directly proportional to its sub-demand exhaust air volume, and the total demand exhaust air volume is the sum of all sub-demand exhaust air volumes.

[0074] Step S30, controlling the operating parameters of the main fan, configuring the total required exhaust air volume for the common flue, and controlling the opening and closing degree of the power distribution valve of each target terminal range hood based on the slave controller, configuring the sub-required exhaust air volume for each target terminal range hood.

[0075] After determining the sub-demand exhaust air volume of each target terminal range hood and the total demand exhaust air volume of the main fan of the central range hood system, the operating parameters of the main fan are first controlled to provide the total demand exhaust air volume for the public flue; then, based on the functional relationship between the exhaust volume of each target terminal range hood and the connecting channel and the opening and closing degree of the power distribution valve, the opening and closing degree of the power distribution valve of each target terminal range hood is controlled by the slave controller to adapt the sub-demand exhaust air volume corresponding to each target terminal range hood, thereby achieving accurate configuration of the total demand exhaust air volume of the central range hood system and accurate configuration of the sub-demand exhaust air volume of each target terminal range hood.

[0076] In this embodiment, by dynamically detecting the target terminal range hoods in working state, the number of target terminal range hoods and the specific users who are using them are known. Furthermore, the height from the exhaust hood to the smoke source, the suction and capture speed, the pipe air leakage rate and the smoking side length of the exhaust hood in the actual use scenario of each target terminal range hood are combined to calculate the sub-demand exhaust air volume actually required by each target terminal range hood. Then, based on each sub-demand exhaust air volume, the total demand exhaust air volume that fits the current actual demand is determined, instead of just considering the number of target terminal range hoods in working state. , more consideration is given to multiple important factors that determine the exhaust air volume demand in the actual usage scenarios of the target terminal range hoods; then, based on controlling the opening and closing degree of the power distribution valve of each target terminal range hood from the controller, a sub-demand exhaust air volume is configured for each target terminal range hood, and the exhaust air volume demand in the current actual usage scenarios of each target terminal range hood is targeted considered, and the current actual exhaust air volume demand of each target terminal range hood is accurately evaluated, which greatly improves the exhaust air volume distribution accuracy of the central range hood system, and is more in line with the actual demand of users for the exhaust air volume of terminal range hoods.

[0077] Furthermore, in another embodiment of the control method of the central range hood system of the present application, a specific calculation and implementation method of the sub-required exhaust air volume and the total required exhaust air volume of each target terminal range hood is provided. Step S20 includes:

[0078] Apply the formula Qn = a*V*P*H*K*3600 to obtain the sub-required exhaust air volume Qn of each target terminal range hood. The total required exhaust air volume = Q1 + Q2 + ... + Qn;

[0079] Among them, a takes a value of 1.3 to 1.5; n is the number of range hoods in the current target terminal, and n is a positive integer; Qn is the required exhaust volume of the range hoods in the target terminal, in cubic meters per hour; V is the suction speed of the range hoods in the target terminal, in meters per second; P is the smoke-absorbing side length P of the exhaust hood of the range hood in the target terminal, in meters; H is the height from the exhaust hood of the range hood in the target terminal to the smoke source, in meters; K is the pipe leakage rate of each range hood in the target terminal.

[0080] For example, a takes the value of 1.4, H is generally around 0.8 meters, V is between 0.2 and 0.5 meters per second, and K takes the value between 1.1 and 1.2. After repeated tests and experiments, based on the above formula and numerical range, the sub-demand exhaust air volume and the total demand exhaust air volume of each target terminal range hood are obtained, which are more in line with the user's actual demand for the exhaust air volume of the terminal range hood, that is, the exhaust volume distribution of the central range hood system is more accurate.

[0081] Optionally, there are multiple temperature sensors and they are respectively arranged at the air inlet and outer surface of the exhaust hood of each target terminal range hood to determine the detection point temperature and the ambient temperature, and the oil fume temperature is the difference between the detection point temperature and the ambient temperature; that is, the detection point temperature is the temperature of the oil fume entering the exhaust hood, and the ambient temperature is the ambient temperature in the kitchen scene where the target terminal range hood is located.

[0082] For example, the oil fume temperature is the difference between the temperature at the detection point and the ambient temperature, that is, the oil fume temperature is the difference between the temperature of the oil fume particles rising from the ambient temperature to the temperature at the detection point, indicating the temperature change of the oil fume, and also indicating the intensity of the firepower and processing temperature of the food materials caused by the current user's cooking method.

[0083] In step A2, the step of determining the suction speed V of each target terminal range hood according to the cooking fume concentration and the fume temperature includes:

[0084] Step A21: Input the cooking fume concentration and fume temperature of each group into a preset algorithm model to determine the suction speed V of each target terminal range hood, wherein the greater the cooking fume concentration, the greater the suction speed V; the greater the fume temperature, the greater the suction speed V.

[0085] Exemplarily, an empirical data table of the suction speed V and the cooking fume concentration (concentration in Table 1) and the fume temperature (temperature difference in Table 1) is shown in Table 1 below. The fume temperature adopts the difference between the detection point temperature on the air inlet side of the hood and the ambient temperature T = T1 (detection point temperature) - T0 (ambient temperature), and the unit of fume concentration is mg / cubic meter. The suction speed determined by the above method is closer to the actual exhaust air volume demand of the kitchen where the target terminal range hood is located, further meets the actual demand of users for the exhaust air volume of the terminal range hood, and further improves the accuracy of the exhaust volume distribution of the central range hood system.

[0086] Table 1

[0087]

[0088]

[0089] Furthermore, in another embodiment of the control method of the central range hood system of the present application, a wind speed sensor and a wind pressure sensor are provided in the connecting passage between each of the terminal range hoods and the common flue, for detecting the actual duct flow velocity and the actual duct wind pressure in the connecting passage;

[0090] After step S30, the method further includes:

[0091] Step B1: Divide the sub-required exhaust air volume of each target terminal range hood by the pipe cross-sectional area of ​​the corresponding connecting channel to determine the ideal pipe flow rate;

[0092] Step B2, comparing the actual pipeline flow rate with the ideal pipeline flow rate. If the actual pipeline flow rate is less than the ideal pipeline flow rate, increasing the opening of the power distribution valve in the connecting channel where the actual pipeline flow rate is less than the ideal pipeline flow rate, and increasing the speed of the main fan accordingly.

[0093] Because any of the terminal range hoods, connecting passages, and public flues could potentially affect the actual exhaust airflow, we first assume the ideal duct flow rate for the terminal range hoods, connecting passages, and public flues, assuming no additional factors affecting the exhaust airflow. The ideal duct flow rate is the sub-demand exhaust airflow of the target terminal range hood divided by the duct cross-sectional area of ​​the corresponding connecting passage. The exhaust airflow is expressed in cubic meters per hour, and the duct cross-sectional area is expressed in square meters.

[0094] When the actual duct flow rate is lower than the ideal duct flow rate, this indicates that additional factors affecting the exhaust air volume exist within the terminal range hood, connecting passage, and common flue, such as a high flue airflow damping coefficient or additional air leaks. In this case, the exhaust air volume is insufficient. Increase the opening of the power distribution valve in the connecting passage where the actual duct flow rate is lower than the ideal duct flow rate, and simultaneously adaptively increase the main fan speed. This means increasing the sub-demand exhaust air volume in the connecting passage where the actual duct flow rate is lower than the ideal duct flow rate by X units, and simultaneously increasing the total demand exhaust air volume of the main fan by X units. If the actual duct flow rate is equal to the ideal duct flow rate, no processing is required for the sub-demand exhaust air volume and the total demand exhaust air volume.

[0095] In addition, after step S30, the method may further include:

[0096] Step B3: dividing the sub-required exhaust air volume of each target terminal range hood by the pipe cross-sectional area of ​​the corresponding connecting channel to determine the ideal pipe flow rate;

[0097] Step B4: Determine the ideal duct wind pressure based on the formula wp=0.5·ro·v1*v1 and the ideal duct flow rate, where wp is the ideal duct wind pressure in kN / m2; ro is the air density in kg / m3; and v1 is the ideal duct flow rate in m / s.

[0098] Step B5, comparing the actual pipeline wind pressure and the ideal pipeline wind pressure. If the actual pipeline wind pressure is less than the ideal pipeline wind pressure, increasing the opening of the power distribution valve in the connecting channel where the actual pipeline wind pressure is less than the ideal pipeline wind pressure, and increasing the speed of the main fan accordingly.

[0099] Because any of the terminal range hoods, connecting passages, and public flues could potentially affect actual exhaust airflow, we first assume the ideal duct flow rate within the duct, assuming no additional factors influencing exhaust airflow. The ideal duct flow rate is the sub-demand exhaust airflow of the target terminal range hood divided by the duct cross-sectional area of ​​the corresponding connecting passage. The units for exhaust airflow are cubic meters per hour, and the units for duct cross-sectional area are square meters. Then, using the formula for wind speed and pressure: wp = 0.5·ro·v1*v1, using the ideal duct flow rate as v1, we determine the ideal duct pressure, wp.

[0100] If the actual duct pressure is lower than the ideal duct pressure, this indicates that additional factors affecting the exhaust air volume exist within the terminal range hood, connecting passage, and common flue, such as a high flue airflow damping coefficient or additional air leaks. In this case, the exhaust air volume is insufficient. Increase the opening of the power distribution valve in the connecting passage where the actual duct pressure is lower than the ideal duct pressure, and simultaneously adaptively increase the main fan speed. This increases the sub-demand exhaust air volume in the connecting passage where the actual duct pressure is lower than the ideal duct pressure by X units, and simultaneously increases the total demand exhaust air volume of the main fan by X units. If the actual duct pressure equals the ideal duct pressure, no processing is required for the sub-demand exhaust air volume or the total demand exhaust air volume.

[0101] Optionally, after determining the sub-required exhaust air volume and the total required exhaust air volume of each target terminal range hood in step S20, the control method of the central range hood system further includes:

[0102] Step C1, obtaining the floor where each target terminal range hood is located;

[0103] Step C2: performing a downward correction on the sub-demand exhaust air volume of the target terminal range hood located in the preset high floor interval to update the sub-demand exhaust air volume. The larger the floor, the larger the correction amplitude.

[0104] Step C3, performing an upward correction on the sub-demand exhaust air volume of the target terminal range hood located in the preset lower floor interval to update the sub-demand exhaust air volume. The larger the floor, the greater the correction amplitude.

[0105] After determining and obtaining the sub-demand exhaust air volume and the total demand exhaust air volume of each target terminal range hood, the floor where each target terminal range hood is located is further determined and obtained. Since the higher the floor where the target terminal range hood is located, the closer the location where it is connected to the public flue is to the main fan, and the easier it is to obtain the exhaust air volume of the main fan, the sub-demand exhaust air volume of the target terminal range hood located in the preset high-floor interval can be corrected downward to update the sub-demand exhaust air volume. The higher the floor, the greater the correction amplitude. Correspondingly, since the lower the floor where the target terminal range hood is located, the farther the location where it is connected to the public flue is from the main fan, and the more difficult it is to obtain the exhaust air volume of the main fan, the sub-demand exhaust air volume of the target terminal range hood located in the preset low-floor interval can be corrected upward to update the sub-demand exhaust air volume. The higher the floor, the greater the correction amplitude. Therefore, all subsequent steps use the corrected and updated sub-demand exhaust air volume and total demand exhaust air volume, which are closer to the actual exhaust air volume demand of the kitchen where the target terminal range hood is located, further meet the user's actual demand for the exhaust air volume of the terminal range hood, and further improve the accuracy of the exhaust air volume distribution of the central range hood system.

[0106] For example, if the residential building where the central range hood system is installed has a total of 32 floors, the preset high floor range is 20 to 32 floors, the preset low floor range is 1 to 10 floors, and the preset middle floor range is 11 to 19 floors.

[0107] Optionally, after step C1, the control method of the central range hood system further includes:

[0108] Step D, determine whether the sub-demand exhaust air volume of the target terminal range hood in the preset high floor interval is less than or equal to the preset minimum threshold; if so, set the sub-demand exhaust air volume of the target terminal range hood in the preset high floor interval to the preset minimum threshold.

[0109] If the target terminal range hood is in the preset high floor interval, this target terminal range hood can more easily obtain the exhaust air volume of the main fan, that is, the opening of the power distribution valve is smaller, and it can also obtain a larger sub-demand exhaust air volume and a faster exhaust airflow, which is easy to form howling at the power distribution valve. Therefore, in order to avoid howling, the opening of the power distribution valve of the target terminal range hood in the preset high floor interval cannot be too small, that is, the sub-demand exhaust air volume of the target terminal range hood in the preset high floor interval cannot be less than the preset minimum threshold. Therefore, when the sub-demand exhaust air volume of the target terminal range hood in the preset high floor interval is less than or equal to the preset minimum threshold, the sub-demand exhaust air volume of the target terminal range hood in the preset high floor interval is set to the preset minimum threshold to avoid howling at the power distribution valve.

[0110] Furthermore, the present application also provides a control device for a central range hood system, which is a carrier for implementing the control method of the central range hood system. Figure 5 , the control device comprises:

[0111] A working state detection module M1 is used to dynamically detect and determine a target terminal range hood that is in a preset working state among the terminal range hoods;

[0112] The exhaust volume determination module M2 is used to determine the sub-required exhaust volume and the total required exhaust volume of each target terminal range hood according to the height from the exhaust hood to the smoke source, the suction and capture speed, the duct leakage rate, and the exhaust hood side length of each target terminal range hood;

[0113] The exhaust volume control module M3 is used to control the operating parameters of the main fan, configure the total required exhaust volume for the common flue, and control the opening and closing degree of the power distribution valve of each target terminal range hood based on the slave controller to configure the sub-required exhaust volume for each target terminal range hood.

[0114] Furthermore, the present application also provides a central range hood system, which includes: a main fan, a terminal range hood, a power distribution valve, a main control module and a slave controller, the main fan is arranged at the top of the public flue of the building, and multiple terminal range hoods are located on each floor of the building and connected to the public flue, the power distribution valve is arranged in the connecting channel between each terminal range hood and the public flue, the slave controller is electrically connected to the power distribution valve, and the main control module is communicatively connected to the main fan and the slave controller respectively; the main control module is a processor, and the central range hood system also includes: a memory, a computer program stored in the memory and runnable on the processor, and the computer program is configured to implement the steps of the above-mentioned control method of the central range hood system.

[0115] For example, refer to Figure 4 , Figure 4 This is a schematic diagram of the framework structure of the related parts of the central range hood system main control module involved in the embodiment of the present application.

[0116] like Figure 4As shown, the central range hood system is an industrial-grade computer device. The central range hood system may include: a processor 1001 (i.e., a main control module), such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005, wherein the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface. The memory 1005 may be a high-speed random access memory (RAM) memory or a stable non-volatile memory (NVM), such as a disk memory. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0117] Those skilled in the art will understand that Figure 4 The structure shown in the figure does not constitute a limitation on the terminal device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0118] like Figure 4 As shown, the memory 1005 as a storage medium may include an operating system, a data storage module, a network communication module, a user interface module and a computer program.

[0119] exist Figure 4 In the terminal device shown, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the terminal device of the present invention can be set in the terminal device, and the terminal device calls the computer program stored in the memory 1005 through the processor 1001, and executes the control method of the central range hood system of each embodiment provided by the embodiment of the present invention.

[0120] Furthermore, the present application also provides a computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the control method of the central range hood system as described above are implemented.

[0121] The technical development and technical effect derivation related to the control device of the central range hood system, the central range hood system and the computer-readable storage medium of the present application are basically the same as those of the above-mentioned embodiments of the control method of the central range hood system, and therefore will not be repeated here.

[0122] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent processing scope of the present application.

Claims

1. A control method for a central range hood system, characterized in that: The central range hood system includes a main fan, a terminal range hood, a power distribution valve, a master control module, and a slave controller. The main fan is arranged at the top of the public flue of the building. A plurality of the terminal range hoods are located on each floor of the building and are connected to the public flue. The power distribution valve is arranged in the connection passage between each terminal range hood and the public flue. The slave controller is electrically connected to the power distribution valve. The main control module is communicatively connected to the main fan and the slave controller respectively. The control method of the central range hood system is applied to the main control module, and the method comprises the following steps: Dynamically detecting and determining a target terminal range hood in a preset working state among the terminal range hoods; After the step of dynamically detecting and determining the target terminal range hood in the preset working state among the terminal range hoods, the method further includes: Based on the distance sensor provided on each of the target terminal range hoods, detecting the height H from the exhaust hood to the smoke source; Based on the smoke sensor and temperature sensor provided on each of the target terminal range hoods, respectively detecting the cooking fume concentration and fume temperature of the environment in which each of the target terminal range hoods is located, and determining the suction and capture speed V of each of the target terminal range hoods according to the cooking fume concentration and fume temperature; Obtaining the pipeline air leakage rate K of the central range hood system, with a value ranging from 1.1 to 1.2; Determine the smoke-intake side length P of the exhaust hood of each target terminal range hood based on the device model of each target terminal range hood, where P is the total length of the outer edge of the exhaust hood not against the wall; Apply the formula Qn = a*V*P*H*K*3600 to obtain the sub-required exhaust air volume Qn of each target terminal range hood. The total required exhaust air volume = Q1 + Q2 + ... + Qn; Where a is between 1.3 and 1.5; n is the number of range hoods in the current target terminal, and is a positive integer; Qn is the sub-demand exhaust volume of the range hoods in the target terminal, in cubic meters per hour; V is the suction speed of the range hoods in the target terminal, in meters per second; P is the exhaust hood side length P of the range hood in the target terminal, in meters; H is the height from the exhaust hood to the smoke source of the range hood in the target terminal, in meters; K is the air leakage rate of the duct of each range hood in the target terminal; Obtaining the floor where each target terminal range hood is located; The sub-demand exhaust air volume of the target terminal range hood located in the preset high floor range is corrected downward to update the sub-demand exhaust air volume. The larger the floor, the greater the correction amplitude. The sub-demand exhaust air volume of the target terminal range hood located in the preset lower floor interval is corrected upward to update the sub-demand exhaust air volume. The larger the floor, the greater the correction amplitude. Control the operating parameters of the main fan to configure the total required exhaust air volume for the common flue, and control the opening and closing degree of the power distribution valve of each target terminal range hood based on the slave controller to configure the sub-required exhaust air volume for each target terminal range hood.

2. The method according to claim 1, wherein The temperature sensors are multiple and are respectively arranged at the air inlet and outer surface of the exhaust hood of each target terminal range hood to determine the detection point temperature and the ambient temperature, and the fume temperature is the difference between the detection point temperature and the ambient temperature; The step of determining the suction speed V of each target terminal range hood according to the cooking fume concentration and the fume temperature includes: The cooking fume concentration and fume temperature of each group are input into a preset algorithm model to determine the suction speed V of each target terminal range hood, wherein the greater the cooking fume concentration, the greater the suction speed V; the greater the fume temperature, the greater the suction speed V.

3. The method according to claim 2, wherein A wind speed sensor and a wind pressure sensor are provided in the connection passage between each of the terminal range hoods and the common flue, for detecting the actual pipe flow velocity and the actual pipe wind pressure in the connection passage; After the steps of controlling the operating parameters of the main fan to configure the total required exhaust air volume for the common flue, and controlling the opening and closing degree of the power distribution valve of each target terminal range hood based on the slave controller to configure the sub-required exhaust air volume for each target terminal range hood, the method further includes: Divide the sub-required exhaust air volume of each target terminal range hood by the pipe cross-sectional area of ​​the corresponding connecting channel to determine the ideal pipe flow rate; comparing the actual pipeline flow rate with the ideal pipeline flow rate, and if the actual pipeline flow rate is less than the ideal pipeline flow rate, increasing the opening of the power distribution valve in the connecting channel where the actual pipeline flow rate is less than the ideal pipeline flow rate, and adaptively increasing the speed of the main fan; Alternatively, the sub-required exhaust air volume of each target terminal range hood is divided by the pipe cross-sectional area of ​​the corresponding connecting channel to determine the ideal pipe flow rate; Based on the formula wp = 0.5·ro·v1*v1 and the ideal duct flow rate, determine the ideal duct wind pressure, where wp is the ideal duct wind pressure in kN / m2; ro is the air density in kg / m3; and v1 is the ideal duct flow rate in m / s. Compare the actual pipeline wind pressure with the ideal pipeline wind pressure. If the actual pipeline wind pressure is lower than the ideal pipeline wind pressure, increase the opening of the power distribution valve in the connecting channel where the actual pipeline wind pressure is lower than the ideal pipeline wind pressure, and increase the speed of the main fan accordingly.

4. The method according to claim 3, wherein After the step of obtaining the floor on which each of the target terminal range hoods is located, the method further includes: Determine whether the sub-demand exhaust air volume of the target terminal range hood whose floor is in the preset high floor interval is less than or equal to the preset minimum threshold; if so, set the sub-demand exhaust air volume of the target terminal range hood whose floor is in the preset high floor interval to the preset minimum threshold.

5. A control device for a central range hood system, characterized in that: The control device of the central range hood system is a carrier for implementing the control method of the central range hood system according to any one of claims 1 to 4, and the control device comprises: a working state detection module, configured to dynamically detect and determine a target terminal range hood in a preset working state among the terminal range hoods; an exhaust volume determination module for determining the sub-required exhaust volume and the total required exhaust volume of each target terminal range hood according to the height from the exhaust hood to the smoke source, the suction and capture speed, the duct leakage rate, and the exhaust hood side length of each target terminal range hood; The exhaust volume control module is used to control the operating parameters of the main fan, configure the total required exhaust volume for the common flue, and control the opening and closing degree of the power distribution valve of each target terminal range hood based on the slave controller to configure the sub-required exhaust volume for each target terminal range hood.

6. A central range hood system, characterized in that: The central range hood system includes: a main fan, a terminal range hood, a power distribution valve, a main control module and a slave controller, the main fan is arranged at the top of the public flue of the building, and multiple terminal range hoods are located on each floor of the building and connected to the public flue, the power distribution valve is arranged in the connecting channel between each terminal range hood and the public flue, the slave controller is electrically connected to the power distribution valve, and the main control module is communicatively connected to the main fan and the slave controller respectively; the main control module is a processor, and the central range hood system also includes: a memory, a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method of the central range hood system as described in any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the control method of the central range hood system according to any one of claims 1 to 4.

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