A central range hood system, control method, and readable storage medium

Abstract

This invention belongs to the field of range hood technology, specifically relating to a central range hood system, control method, and readable storage medium. Addressing the shortcomings of existing central range hood systems that are only applicable to the entire unpowered or fully powered system, this invention adopts the following technical solution: a control method for a central range hood system, comprising: S1, initial power coarse adjustment, including: determining the current frequency of the variable frequency fan and determining the initial angle of the valve plate of the electric check valve at the newly opened terminal; S2, power distribution to powered terminals, including: adjusting the ventilation volume of each powered terminal and adjusting the frequency of the variable frequency fan according to the wind pressure value of each powered terminal; S3, power compensation for unpowered terminals, including: adjusting the frequency of the variable frequency fan according to the wind pressure value of each unpowered terminal. The beneficial effect of this invention is that it allows for more targeted adjustments to systems with a mixture of unpowered and powered terminals.

Description

Technical Field

[0001] This invention belongs to the field of range hood technology, specifically relating to a central range hood system, control method, and readable storage medium. Background Technology

[0002] The existing central range hood system in high-rise residential buildings includes a main unit, terminals, and a cloud platform. The main unit is installed at the exit of the common flue on the roof, actively or indirectly removing fumes from the flue. The terminals communicate with the main unit via wired or wireless means and, under the control of the main unit, adjust the exhaust from multiple kitchens through the common flue. The cloud platform collects terminal operation data reported by the main unit and analyzes big data such as user habits.

[0003] There are two main application scenarios for central range hood systems in existing high-rise residential buildings: the first is that the main unit is equipped with a non-powered hood, while each user chooses a regular range hood with power, and the main unit only provides auxiliary smoke exhaust; the second is that the main unit is equipped with a fan, which provides power, and each end user chooses a non-powered hood, and each user's smoke exhaust is achieved through the main unit's fan.

[0004] In the first approach, the terminal uses a powered range hood that automatically adjusts the airflow. However, this method is noisy and does not achieve the low-noise effect of a non-powered terminal. Furthermore, the addition of a power unit after the powered range hood is somewhat redundant, resulting in a higher overall system cost.

[0005] The second method uses a power unit placed at the top of the common flue to generate power, and adjusts the angle of the check valve plate (or other methods) connected to the common flue to achieve a uniform distribution of flow to each floor. This method can achieve smooth smoke exhaust and low noise usage, and is becoming increasingly popular.

[0006] However, one of the problems encountered in actual use is that the fully furnished apartments delivered by the developers are all uniformly equipped with non-powered range hoods. Some users replace them with powered range hoods for aesthetic reasons, personal preferences, etc. The coexistence of non-powered and powered range hoods leads to an imbalance in the exhaust power of the public flue.

[0007] In summary, existing central range hood systems are only suitable for either a single non-powered system or a single powered system. They can achieve good distribution results when the power performance of each terminal is consistent, but they are not effective for systems that combine non-powered and powered systems. Summary of the Invention

[0008] This invention addresses the shortcomings of existing central range hood systems, which are only applicable to either entirely unpowered or entirely powered systems. It provides a central range hood system that is well-suited for scenarios involving a mix of powered and unpowered kitchen exhaust terminals. This ensures that the unpowered terminals have sufficient power to guarantee effective smoke extraction when the powered terminals are operating. This invention also provides a control method for the central range hood system and a computer-readable storage medium.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a central range hood system, the central range hood system comprising:

[0010] Multiple terminals are installed on different floors, and the terminals are divided into powered terminals and unpowered terminals.

[0011] Multiple smoke pipes;

[0012] Multiple electric check valves are installed in each of the flue pipes;

[0013] A common flue, wherein each of the aforementioned terminals is connected to the common flue via its respective flue pipe;

[0014] The main unit is located at the top of the common flue, and the main unit includes a variable frequency fan;

[0015] Terminal information collection system;

[0016] Main control system;

[0017] The terminal information acquisition system collects and sends information from each terminal, including power-on information, floor location, power availability, and wind pressure value, to the main control system. The main control system adjusts the variable frequency fan and the electric check valve based on the received information.

[0018] Compared to existing technologies with either entirely unpowered or entirely powered terminals, the central range hood system of this invention allows for more targeted adjustments to systems that combine unpowered and powered terminals.

[0019] As an improvement to the central range hood system, the main control system first adjusts the frequency of the variable frequency fan and the valve plate angle of the electric check valve according to the information received from the powered terminal, and then adjusts the variable frequency fan according to the information received from the unpowered terminal.

[0020] As an improvement to the central range hood system, the terminal information acquisition system and the main control system use local wireless communication. A metal wire is installed in the common flue to improve transmission capacity.

[0021] As an improvement to the central range hood system, the variable frequency fan is adjusted by changing its frequency, speed, or the total air volume at the outlet.

[0022] A control method for a central range hood system, the control method being applied to the aforementioned central range hood, the control method comprising:

[0023] S1. Initial power coarse adjustment, including: determining the current frequency of the variable frequency fan and determining the initial angle of the valve plate of the electric check valve at each terminal;

[0024] S2. Power distribution to powered terminals, including: adjusting the valve plate angle at each powered terminal and adjusting the frequency of the variable frequency fan according to the wind pressure value of each powered terminal;

[0025] S3. Power compensation for non-powered terminals, including: adjusting the frequency of the variable frequency fan according to the wind pressure value of each non-powered terminal.

[0026] As an improvement to the control method, the control method includes:

[0027] S1. Initial power coarse adjustment, including: based on the frequency F' of the variable frequency fan and the number of non-powered terminals N started at the previous moment. 无 'Number of powered terminals turned on N' 有 '、Unpowered increasing frequency f 无 The frequency f is dynamically increasing. 有 And the number of non-powered terminals N that are currently powered on. 无 Number of powered terminals N 有 Determine the current frequency F of the variable frequency fan; based on the floor angle coefficient C of the newly opened terminal. n Floor-related adjustment angle θ 开 The total number of units N and the related adjustment angle θ 关 Determine the initial angle θ of the valve plate of the electric check valve at each terminal. n , where n is the number of floors;

[0028] S2. Power distribution to powered terminals, including: based on the minimum powered wind pressure value P of the powered terminals. min Maximum dynamic wind pressure value P max Minimum opening angle θ of the powered terminal y The frequency f is dynamically increasing. 有 The wind pressure value P of each powered terminal unit when started. 有n Adjust the valve plate angle and frequency of the variable frequency fan at each powered terminal that is turned on, from the high floor to the low floor.

[0029] S3. Power compensation for powerless terminals, including: based on the highest powerless wind pressure value p and the powerless increment frequency f of the powerless terminal. 无The wind pressure value P of each powered terminal unit when started. 无n The frequency of the variable frequency fan is adjusted sequentially from the high-rise to the low-rise buildings.

[0030] As an improvement to the control method, in step S1, the current frequency of the variable frequency fan is determined according to the following formula:

[0031] F = F' + f 无 *(N 无 -N 无 ')+f 有 *(N 有 -N 有 ')

[0032] Where F is the current frequency of the variable frequency fan, F' is the frequency of the variable frequency fan at the previous moment, and f 无 For unpowered increasing frequency, N 无 N represents the current number of powered terminals. 无 'This represents the number of unpowered terminals that were powered on at the previous moment, f' 有 For a dynamically increasing frequency, N 有 N represents the current number of powered terminals. 有 'This represents the number of powered terminals that were turned on at the previous moment.'

[0033] As an improvement to the control method, in step S1,

[0034] The initial angle of the valve plate of the electric check valve at each terminal is determined according to the following formula:

[0035] θ n =90-C n *θ 开 -N*θ 关

[0036] Where n is the number of floors, θ n C represents the initial angle of the valve disc of the electric check valve at each floor terminal. n θ is the floor angle coefficient. 开 For floor-related adjustment angles, N is the total number of units turned on, and θ is the angle of adjustment. 关 Adjust the angle according to the total number of units started;

[0037] Among them, the initial angle of the valve plate of the powered and unpowered terminal on the same floor is the same, and the initial angle of the valve plate gradually increases as the floor decreases.

[0038] As an improvement to the control method, in step S2,

[0039] When there is a power terminal wind pressure value P 有n Less than the minimum dynamic wind pressure value P min When this occurs, it indicates excess power, which can be adjusted using the angle adjustment formula θ. 有n =θ'有n -M*θ'

[0040] Adjust the valve plate angle of the electric check valve, where θ' 有n Let θ' be the valve plate angle of the electric check valve at the previous moment, θ' be the minimum adjustment angle in a single operation, and M be the number of adjustments.

[0041] When the valve plate angle of the electric check valve is low to the minimum opening angle θ of the powered terminal... y No further adjustments will be made at this time;

[0042] When there is a power terminal wind pressure value P 有n At the lowest dynamic wind pressure value P min With the highest dynamic wind pressure value P max When the time is between, it indicates that the power is sufficient and there is no need to adjust the valve plate angle of the electric check valve;

[0043] When there is a power terminal wind pressure value P 有n Greater than the maximum dynamic wind pressure value P max When the frequency is insufficient, it indicates insufficient power. This can be addressed using the variable frequency fan frequency adjustment formula: F = F' + f. 有 This improves the overall power of the system.

[0044] As an improvement to the control method, in step S3,

[0045] When the wind pressure value P of the non-powered terminal 无n When the pressure exceeds the maximum non-powered wind pressure value p, it indicates insufficient power. This can be addressed by adjusting the frequency of the variable frequency fan using the formula F = F' + f. 无 This improves the overall power of the system;

[0046] When the wind pressure value P of the non-powered terminal 无n When the pressure is less than the maximum non-powered wind pressure value p, it indicates that the power is sufficient and there is no need to adjust the frequency of the variable frequency fan.

[0047] A computer-readable storage medium stores a control program for a central range hood system, which, when executed by a processor, implements the various steps of the aforementioned control method for the central range hood system.

[0048] The beneficial effects of the central range hood system of the present invention are: it allows for more targeted adjustments to a system that combines powered and unpowered terminals. Furthermore, the terminal information acquisition system collects and sends relevant information from powered and unpowered terminals to the main control system. The main control system adjusts the frequency of the variable frequency fan and the valve plate angle of the electric check valve based on the information from the powered and unpowered terminals, ensuring sufficient power for the unpowered terminals on lower floors. Therefore, the entire system, regardless of the floor level or whether it is powered or unpowered, can guarantee sufficient power.

[0049] The beneficial effects of the control method for the central range hood system of the present invention are: it allows for more targeted adjustments to a system that combines powered and unpowered terminals. Furthermore, after initially setting a uniform valve angle at the variable frequency fan, powered terminals, and unpowered terminals, adjusting the variable frequency fan frequency or valve angle separately for each terminal ensures that powered terminals do not have excessive power and unpowered terminals have sufficient power. This guarantees the basic smoke extraction effect of the lower-floor unpowered terminals without sacrificing the smoke extraction effect of the middle and upper floors. Adjusting the powered and unpowered terminals separately yields better results. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the central range hood system according to Embodiment 1 of the present invention.

[0051] Figure 2 This is a flowchart illustrating the steps of the control method for the central range hood system according to Embodiment 2 of the present invention.

[0052] Figure 3 This is a further step diagram of the control method of the central range hood system according to Embodiment 2 of the present invention.

[0053] Figure 4 This is a further step flowchart of the control method of the central range hood system in Embodiment 2 of the present invention.

[0054] In the diagram, 1 represents a powered terminal;

[0055] 2. Non-powered terminal;

[0056] 3. Electric check valve;

[0057] 4. Wind pressure sensor;

[0058] 5. Public smoke exhaust duct;

[0059] 6. Host computer;

[0060] 7. Metal wire. Detailed Implementation

[0061] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0062] Example 1

[0063] See Figure 1According to Embodiment 1 of the present invention, a central range hood system includes:

[0064] Multiple terminals are installed on different floors, and the terminals are divided into powered terminals 1 and unpowered terminals 2.

[0065] Multiple smoke pipes;

[0066] Electric check valve 3, each of the aforementioned flue pipes is respectively installed with the electric check valve 3;

[0067] The common flue 5, and each of the terminals is connected to the common flue 5 through its respective flue pipe;

[0068] The main unit 6 is located at the top of the common flue 5, and the main unit 6 includes a variable frequency fan;

[0069] Terminal information collection system;

[0070] Main control system;

[0071] The terminal information acquisition system collects and sends information from each terminal, including power-on information, floor location, power availability, and wind pressure value, to the main control system. The main control system adjusts the frequency of the variable frequency fan and the valve plate angle of the electric check valve 3 based on the received information.

[0072] In other embodiments, the wind pressure sensor 4 can be replaced by an air volume sensor.

[0073] In this embodiment, the terminal information acquisition system and the main control system communicate via a wireless ad hoc network. This allows the system to integrate with existing broadband networks or operate independently, without relying on existing broadband, thus meeting the communication needs of specific environments. The wireless ad hoc network includes metal wires 7 installed in the public flue to improve transmission capabilities.

[0074] In other embodiments, wired communication or other methods may also be used.

[0075] In this embodiment, the adjustment of the variable frequency fan is achieved by changing its frequency, rotational speed, or total air volume at the outlet.

[0076] In this implementation, the terminal information acquisition system includes a control board mounted on each of the electric check valves 3. The control board stores floor code information, is communicatively connected to the air volume sensor, and is also communicatively connected to the main control system. The control board identifies that the unpowered terminal 2 has been turned on by detecting the gear position information of the unpowered terminal 2, and identifies that the powered terminal 1 has been turned on by detecting the fan power of the powered terminal 1.

[0077] The beneficial effects of the central range hood system in Embodiment 1 of the present invention are as follows: The terminal information acquisition system collects and sends information on whether powered terminals 1 and non-powered terminals 2 are turned on, whether they are powered or not, which floor they are located on, and their wind pressure values ​​to the main control system. The main control system adjusts the frequency of the variable frequency fan and the valve plate angle of the electric check valve 3 according to the wind pressure of powered terminals 1, and adjusts the frequency of the variable frequency fan according to the wind pressure of non-powered terminals 2. This ensures that the power supply to the non-powered terminals on the lower floors is sufficient, so that the entire system can ensure sufficient power regardless of whether it is a high-rise or low-rise building, powered or non-powered.

[0078] Example 2

[0079] See Figures 1 to 4 A control method for a central range hood system, wherein the control method is applied to a central range hood according to Embodiment 1, and the control method includes:

[0080] S1. Initial power coarse adjustment, including: determining the current frequency of the variable frequency fan and determining the initial angle of the valve plate of the electric check valve at each terminal;

[0081] S2. Power distribution to powered terminals, including: adjusting the valve plate angle at each powered terminal and adjusting the frequency of the variable frequency fan according to the wind pressure value of each powered terminal;

[0082] S3. Power compensation for non-powered terminals, including: adjusting the frequency of the variable frequency fan according to the wind pressure value of each non-powered terminal.

[0083] Repeat the above steps when opening a new terminal.

[0084] In existing technologies, only step S1 is typically included, which treats powered and unpowered terminals uniformly. This embodiment adds steps S2 and S3 to specifically adjust the valve angle and frequency of the variable frequency fan at the powered terminal based on the differences between powered and unpowered terminals, thereby achieving better distribution results.

[0085] In this embodiment, the control method includes:

[0086] S1. Initial power coarse adjustment, including: based on the frequency F' of the variable frequency fan and the number of non-powered terminals N started at the previous moment. 无 'Number of powered terminals turned on N' 有 '、Unpowered increasing frequency f 无 The frequency f is dynamically increasing. 有 And the number of non-powered terminals N that are currently powered on. 无 Number of powered terminals N 有 Determine the current frequency F of the variable frequency fan; based on the floor angle coefficient C of the newly opened terminal. n Floor-related adjustment angle θ开 The total number of units N and the related adjustment angle θ 关 Determine the initial angle θ of the valve plate of the electric check valve at each terminal. n , where n is the number of floors;

[0087] S2. Power distribution to powered terminals, including: based on the minimum powered wind pressure value P of the powered terminals. min Maximum dynamic wind pressure value P max Minimum opening angle θ of the powered terminal y The frequency f is dynamically increasing. 有 The wind pressure value P of each powered terminal unit when started. 有n Adjust the valve plate angle and frequency of the variable frequency fan at each powered terminal that is turned on, from the high floor to the low floor.

[0088] S3. Power compensation for powerless terminals, including: based on the highest powerless wind pressure value p and the powerless increment frequency f of the powerless terminal. 无 The wind pressure value P of each powered terminal unit when started. 无n The frequency of the variable frequency fan is adjusted sequentially from the high-rise to the low-rise buildings.

[0089] In this embodiment, in step S1, the current frequency of the variable frequency fan is determined according to the following formula:

[0090] F = F' + f 无 *(N 无 -N 无 ')+f 有 *(N 有 -N 有 ')

[0091] Where F is the current frequency of the variable frequency fan, F' is the frequency of the variable frequency fan at the previous moment, and f 无 For unpowered increasing frequency, N 无 N represents the current number of powered terminals. 无 'This represents the number of unpowered terminals that were powered on at the previous moment, f' 有 For a dynamically increasing frequency, N 有 N represents the current number of powered terminals. 有 'This represents the number of powered terminals that were turned on at the previous moment.'

[0092] Unpowered increasing frequency f 无 To add a new unpowered terminal, the frequency that the variable frequency fan needs to increase is the powered incremental frequency f. 有 To add a new power terminal, the frequency required to increase the frequency of the variable frequency fan is f. 无 Greater than f 有 Unpowered increasing frequency f 无 and the frequency f of the dynamic increase 有The frequency can be theoretically calculated, simulated, and adjusted based on various parameters such as the number of floors in the building, the number of households on each floor, the diameter of the flue, and the variable frequency fan.

[0093] In this embodiment, in step S1,

[0094] The initial angle of the valve plate of the electric check valve at each terminal is determined according to the following formula:

[0095] θ n =90-C n* θ 开 -N*θ 关

[0096] Where, θ n C represents the initial angle of the valve disc of the electric check valve at each floor terminal. n θ is the floor angle coefficient, where n is the floor number and θ is the floor angle coefficient. 开 For floor-related adjustment angles, N is the total number of units turned on, and θ is the angle of adjustment. 关 The adjustment angle is related to the total number of units started, and n is the number of floors.

[0097] When a new terminal is activated, the valve plate angles of the electric check valves at all activated terminals are adjusted according to this formula to unify the initial valve plate angles of the electric check valves at terminals on the same floor. This means that regardless of whether the terminal is powered or not, the initial valve plate angles are the same on the same floor, and further adjustments are made in subsequent steps. The initial valve plate angle gradually increases as the floor level decreases, and the initial valve plate angles of several adjacent floors can be the same.

[0098] For a specific building complex, the floor angle coefficient C n The floor-related adjustment angle θ is a constant that varies with the number of floors. 开 The adjustment angle θ, which varies with the number of floors and is obtained through simulation or actual measurement, is related to the total number of units in operation. 关 The adjustment angle varies depending on the total number of terminals N that are powered on. The total number of terminals N includes the newly powered-on terminal.

[0099] In this embodiment, in step S2,

[0100] When there is a power terminal wind pressure value P 有n Less than the minimum dynamic wind pressure value P min When this occurs, it indicates excess power, which can be adjusted using the angle adjustment formula θ. 有n =θ' 有n -M*θ'

[0101] Adjust the valve plate angle of the electric check valve, where θ' 有n θ' represents the valve plate angle of the electric check valve at the previous moment, θ' represents the minimum adjustment angle in a single operation, and M represents the number of adjustments.

[0102] Powered terminal wind pressure value P 有n The minimum dynamic wind pressure value P is obtained through measurement by a wind pressure sensor. min The minimum adjustment angle θ' for a single operation is obtained through theoretical calculations, simulation experiments, and actual testing.

[0103] When the valve plate angle of the electric check valve is θ 有n Minimum opening angle θ of the powered terminal y No further adjustments will be made. The minimum opening angle θ of the powered terminal is [not specified]. y The result was obtained through theoretical calculations, simulation experiments, and actual testing adjustments. Multiple adjustments were made simultaneously until θ was reached. 有n =θ y For example: if θ' is 0.1°, decrease it by 0.1° each time, and repeat this process multiple times.

[0104] When there is a power terminal wind pressure value P 有n At the lowest dynamic wind pressure value P min With the highest dynamic wind pressure value P max When the value is between these thresholds, it indicates sufficient power, and no adjustment of the electric check valve's valve plate angle is required. Minimum powered air pressure value P min and the highest dynamic wind pressure value P max It was obtained through theoretical calculations, simulation experiments, and adjustments based on actual tests.

[0105] When there is a power terminal wind pressure value P 有n Greater than the maximum dynamic wind pressure value P max When the frequency is insufficient, it indicates insufficient power. This can be addressed using the variable frequency fan frequency adjustment formula: F = F' + f. 有 This improves the overall power of the system.

[0106] As an improvement to the control method, in step S3,

[0107] When the wind pressure value P of the non-powered terminal 无n When the pressure exceeds the maximum non-powered wind pressure value p, it indicates insufficient power. This can be addressed by adjusting the frequency of the variable frequency fan using the formula F = F' + f. 无 This improves the overall power of the system. The wind pressure value P at the unpowered terminal... 无n Measured by a wind pressure sensor. The maximum non-powered wind pressure value p is obtained through theoretical calculations, simulation experiments, and adjustments based on actual tests.

[0108] When the wind pressure value P of the non-powered terminal 无n When the pressure is less than the maximum non-powered wind pressure value p, it indicates that the power is sufficient and there is no need to adjust the frequency of the variable frequency fan.

[0109] The control process of the central range hood system in this embodiment two is as follows: First, the system starts running and detects the number of powered-on terminals. When the number of powered-on terminals is greater than 0, proceed to the next step: check if the number of powered-on terminals at the current time and the previous time are the same (the current time can be triggered by detecting a new powered-on terminal or by a timed trigger). If they are different, proceed to the next step, according to the formula F = F' + f. 无 *(N 无 -N 无 ')+f 有 *(N 有 -N 有 Determine the current frequency F of the variable frequency fan, and then, according to the formula θ n =90-C n *θ 开 -N*θ 关 Determine the initial angle of the valve plate of the electric check valve at each terminal, then check if any power terminal is running. When a power terminal is detected, compare the wind pressure value P of each power terminal from the upper floor to the lower floor. 有n and the lowest dynamic wind pressure value P min Maximum dynamic wind pressure value P max When there is a power terminal wind pressure value P 有n Less than the minimum dynamic wind pressure value P min When this occurs, it indicates excess power, which can be adjusted using the angle adjustment formula θ. 有n =θ' 有n -M*θ' Adjust the valve plate angle of the electric check valve in M ​​steps according to the minimum adjustment angle θ' in a single operation, until the valve plate angle of the electric check valve is θ. 有n Equal to (or less than) the minimum opening angle θ of the powered terminal y When there is a power terminal wind pressure value P 有n Greater than the maximum dynamic wind pressure value P max When the frequency is insufficient, it indicates insufficient power. This can be addressed using the variable frequency fan frequency adjustment formula: F = F' + f. 有 Increase the frequency of the variable frequency fan to increase the overall power of the system until the wind pressure value P at the power terminal is reached. 有n Less than or equal to the highest dynamic wind pressure value P max After all powered terminals have been adjusted from the highest to the lowest floors, check if any unpowered terminals are running. If an unpowered terminal is detected, compare its wind pressure value P with that of the unpowered terminal. 无n And the highest non-powered wind pressure value p, when the wind pressure value P of the non-powered terminal 无n When the pressure exceeds the maximum non-powered wind pressure value p, it indicates insufficient power. This can be addressed by adjusting the frequency of the variable frequency fan using the formula F = F' + f. 无 Increase the frequency of the variable frequency fan to increase the overall power of the system until the wind pressure value P at the unpowered terminal is increased. 无nThe pressure is less than or equal to the highest non-powered wind pressure value p. Once all non-powered terminals have been adjusted from the high floor to the low floor, this operation ends.

[0110] The beneficial effects of the control method for the central range hood system in Embodiment 2 of the present invention are as follows: After initially setting up both powered and non-powered terminals uniformly, adjusting the frequency of the variable frequency fan or the valve angle of each powered and non-powered terminal separately ensures that the powered terminals do not have excessive power and the non-powered terminals have sufficient power. In a mixed system of powered and non-powered terminals, the powered terminals have a significant impact on the smoke exhaust of the non-powered terminals. By monitoring methods such as wind pressure values, the smoke exhaust effect of each terminal is gradually confirmed from the upper floors to the lower floors, ensuring the basic smoke exhaust effect of the lower-floor terminals without sacrificing the smoke exhaust effect of the middle and upper floors. First, the frequency of the variable frequency fan and the valve angle at the powered terminals are adjusted according to the powered terminals, and then the frequency of the variable frequency fan is adjusted according to the non-powered terminals, making the adjustment simpler and faster. If the order of steps two and three is reversed, i.e., non-powered terminals are used first and then powered terminals, the relatively complex powered terminals will affect the allocated non-powered terminals again, resulting in the need for reallocation of non-powered terminals.

[0111] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes, but is not limited to, the content described in the above specific embodiments. Any modifications that do not depart from the functional and structural principles of the present invention will be included within the scope of the claims.

Claims

1. A control method for a central range hood system, characterized by: The control method includes: S1. Initial power coarse adjustment, including: determining the current frequency of the variable frequency fan and determining the initial angle of the valve plate of the electric check valve at each terminal; S2. Power distribution to powered terminals, including: adjusting the valve plate angle at each powered terminal and adjusting the frequency of the variable frequency fan according to the wind pressure value of each powered terminal; S3. Power compensation for non-powered terminals, including: adjusting the frequency of the variable frequency fan according to the wind pressure value of each non-powered terminal; The control method includes: S1. Initial power coarse adjustment, including: based on the frequency F' of the variable frequency fan and the number of non-powered terminals N started at the previous moment. 无 'Number of powered terminals turned on N' 有 '、Unpowered increasing frequency f 无 The frequency f is dynamically increasing. 有 And the number of non-powered terminals N that are currently powered on. 无 Number of powered terminals N 有 Determine the current frequency F of the variable frequency fan; based on the floor angle coefficient Cn of the newly opened terminal and the floor-related adjustment angle θ. 开 The total number of units N and the related adjustment angle θ 关 Determine the initial angle θn of the valve plate of the electric check valve at each terminal; S2. Power distribution to powered terminals, including: based on the minimum powered wind pressure value P of the powered terminals. min Maximum dynamic wind pressure value P max Minimum opening angle of powered terminal The frequency f is dynamically increasing. 有 The wind pressure value P of each powered terminal unit when started. 有n Adjust the valve plate angle and frequency of the variable frequency fan at each powered terminal that is turned on, from the high floor to the low floor. S3. Power compensation for powerless terminals, including: based on the highest powerless wind pressure value p and the powerless increment frequency f of the powerless terminal. 无 Wind pressure values ​​of each powered terminal unit. The frequency of the variable frequency fan is adjusted sequentially from the high-rise to the low-rise buildings.

2. The control method of a central range hood system according to claim 1, characterized in that: In step S1, the current frequency of the variable frequency fan is determined according to the following formula: F = F' + f_no (N_no N_no') + f_yes (N_yes N_yes') Where F is the current frequency of the variable frequency fan, F' is the frequency of the variable frequency fan at the previous moment, f_no is the unpowered incremental frequency, N_no is the current number of unpowered terminals, N_no' is the previous number of unpowered terminals, f_powered is the incremental frequency of powered terminals, N_powered is the current number of powered terminals, and N_powered' is the previous number of powered terminals.

3. A control method for a central range hood system according to claim 2, characterized in that: In step S1, The initial angle of the valve plate of the electric check valve at each terminal is determined according to the following formula: θn= 90 Cn θon N θoff Where θn is the initial angle of the valve plate of the electric check valve at each floor terminal, Cn is the floor angle coefficient, θopen is the floor-related adjustment angle, N is the total number of start-up valves, θclose is the total number of start-up valves-related adjustment angle, and n is the floor number. Among them, the initial angle of the valve plate of the powered and unpowered terminal on the same floor is the same, and the initial angle of the valve plate gradually increases as the floor decreases.

4. The control method of a central range hood system according to claim 1, characterized in that: In step S2, When the powered terminal wind pressure value P has n is less than the minimum powered wind pressure value Pmin, it indicates that power is excessive, and the angle adjustment formula θ has n = θ' has n M θ' Adjust the valve plate angle of the electric check valve, where θ'n is the valve plate angle of the electric check valve at the previous moment, θ'min is the minimum adjustment angle in a single operation, and M is the number of adjustments. When the valve plate angle of the electric check valve is lower than the minimum opening angle θy of the powered terminal, it will no longer be adjusted. When the powered terminal wind pressure value Pn is between the lowest powered wind pressure value Pmin and the highest powered wind pressure value Pmax, it indicates that the power is sufficient and there is no need to adjust the valve plate angle of the electric check valve. When the powered terminal wind pressure value Pn is greater than the maximum powered wind pressure value Pmax, it indicates insufficient power. The overall power of the system can be improved by adjusting the frequency of the variable frequency fan using the formula F = F' + fn.

5. The control method of a central range hood system according to claim 1, characterized in that: In step S3, When the wind pressure value P_n of the unpowered terminal is greater than the maximum unpowered wind pressure value p, it indicates insufficient power. The overall power of the system can be improved by adjusting the frequency of the variable frequency fan using the formula F = F' + f_n. When the wind pressure value P_n of the unpowered terminal is less than the maximum unpowered wind pressure value p, it indicates that the power is sufficient and there is no need to adjust the frequency of the variable frequency fan.

6. A central range hood system, employing the control method described in any one of claims 1 to 5, characterized in that: The central range hood system includes: Multiple terminals are installed on different floors, and the terminals are divided into powered terminals and non-powered terminals. Multiple smoke pipes; Multiple electric check valves are installed in each of the flue pipes; A common flue, wherein each of the aforementioned terminals is connected to the common flue via its respective flue pipe; The main unit is located at the top of the common flue, and the main unit includes a variable frequency fan; A terminal information acquisition system, the terminal information acquisition system including a wind pressure sensor or a wind volume sensor installed at the outlet of each terminal; Main control system; The terminal information acquisition system collects and sends information from each terminal, including power-on information, floor location, power availability, and wind pressure value, to the main control system. The main control system adjusts the variable frequency fan and the electric check valve based on the received information.

7. A central range hood system according to claim 6, characterized in that: The main control system first adjusts the frequency of the variable frequency fan and the valve plate angle of the electric check valve according to the information received from the powered terminal, and then adjusts the frequency of the variable frequency fan according to the information received from the unpowered terminal.

8. A central range hood system according to claim 6, characterized in that: The terminal information acquisition system and the main control system use local wireless communication.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a control program for a central range hood system, which, when executed by a processor, implements the various steps of the control method for the central range hood system as described in any one of claims 1 to 5.

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