Control methods, control devices, systems, and storage media for central tobacco control systems

Abstract

This invention discloses a control method, control device, central smoke control system, and computer-readable storage medium for a central smoke control system. The control method includes: acquiring the actual required air volume and total pressure rise for each floor; matching the operating conditions of auxiliary fans and terminal smoke control fans based on the actual required air volume and total pressure rise to obtain the target speeds of the auxiliary fans and terminal smoke control fans; the auxiliary fans are installed in the terminal smoke ducts, which connect to the common smoke duct and the terminal smoke control fans; controlling the auxiliary fans to operate at their target speeds, and controlling the fans of the terminal smoke control fans to operate at their target speeds. This control method, by adding auxiliary fans to the terminal smoke control fans, allows the auxiliary fans to provide total pressure rise, reducing the pressure rise at the fans of the terminal smoke control fans, which helps improve noise levels and also widens the coverage of the total pressure difference between two floors, significantly expanding the operating condition coverage of the central smoke control system.

Description

Technical Field

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

[0002] Currently, central exhaust fan systems can be applied in buildings with shared ventilation ducts. A central exhaust fan system can include multiple terminal exhaust fans, which are installed in the user's kitchen. The central exhaust fan system can control the operation of each terminal exhaust fan. However, due to the performance limitations of the terminal exhaust fans, when uniformly controlling the airflow distribution across floors, the relative total pressure difference between the floor with the lowest back pressure and the floor with the highest back pressure should not be too large, otherwise the terminal exhaust fans may not reach the required operating speed even at maximum. Summary of the Invention

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

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

[0005] Obtain the actual required air volume and the required total pressure rise for each floor;

[0006] The operating conditions of the auxiliary fan and the terminal flue are matched based on the actual required air volume and the required total pressure rise to obtain the target speed of the auxiliary fan and the target speed of the terminal flue. The auxiliary fan is installed in the terminal flue, which is connected to the common flue and the terminal flue.

[0007] The auxiliary fan is controlled to operate at its target speed, and the fan of the terminal smoke fan is controlled to operate at its target speed.

[0008] The aforementioned control method, by adding auxiliary fans to the terminal exhaust fans and matching the operating conditions of the auxiliary fans and terminal exhaust fans according to the actual required air volume and total pressure rise of each floor to obtain the appropriate speed, and by ensuring that the auxiliary fans and terminal exhaust fans operate at the corresponding speeds, widens the coverage range of the total pressure difference between the two floors, significantly expanding the operating condition coverage range of the central exhaust fan system. Furthermore, the total pressure rise can also be provided by the auxiliary fans, reducing the pressure rise at the terminal exhaust fan's fan, which helps improve noise levels.

[0009] In some implementations, the step of matching the operating conditions of the auxiliary fan and the terminal smoke hood by combining the actual required air volume and the required total pressure rise to obtain the target speed of the auxiliary fan and the target speed of the terminal smoke hood includes:

[0010] The operating conditions of the auxiliary fan and the terminal smoke fan are matched based on the actual required air volume and the required total pressure rise to minimize the total power of the auxiliary fan and the terminal smoke fan;

[0011] The target speed of the auxiliary fan and the target speed of the terminal smoke fan are determined based on the minimum total power.

[0012] In some implementations, matching the operating conditions of the auxiliary fan and the terminal smoke hood based on the actual required air volume and the required total pressure rise to minimize the total power of the auxiliary fan and the terminal smoke hood includes:

[0013] Based on the actual required air volume for each floor, specify the operating point of the auxiliary fan, and calculate the pressure rise and speed corresponding to the operating point;

[0014] The pressure rise of the terminal smoke hood is determined based on the required total pressure rise of each floor and the pressure rise of the auxiliary fan;

[0015] The rotation speed of the terminal range hood is determined based on the actual air volume required on each floor and the pressure rise of the terminal range hood.

[0016] The total power of the auxiliary fan and the terminal smoke fan is calculated based on the rotational speed of the auxiliary fan and the rotational speed of the terminal smoke fan.

[0017] The operating point of the auxiliary fan is gradually changed, and a cyclic calculation is started to obtain multiple total power values. The multiple total power values ​​are compared to determine the minimum total power value.

[0018] In some embodiments, the process of matching the operating conditions of the auxiliary fan and the terminal flue fan by combining the actual required air volume and the required total pressure rise to obtain the target speed of the auxiliary fan and the target speed of the terminal flue fan, wherein the auxiliary fan is installed in the terminal flue, and the terminal flue connects the common flue and the terminal flue fan includes:

[0019] The operating conditions of the auxiliary fan and the terminal smoke fan are matched based on the actual required air volume and the required total pressure rise to minimize the total noise of the auxiliary fan and the terminal smoke fan;

[0020] The target speed of the auxiliary fan and the target speed of the terminal smoke fan are determined based on the minimum total noise.

[0021] In some implementations, matching the operating conditions of the auxiliary fan and the terminal smoke hood based on the actual required air volume and the required total pressure rise to minimize the total noise of the auxiliary fan and the terminal smoke hood includes:

[0022] Based on the actual required air volume for each floor, specify the operating point of the auxiliary fan, and calculate the pressure rise and speed corresponding to the operating point;

[0023] The pressure rise of the terminal smoke hood is determined based on the required total pressure rise of each floor and the pressure rise of the auxiliary fan;

[0024] The rotation speed of the terminal range hood is determined based on the actual air volume required on each floor and the pressure rise of the terminal range hood.

[0025] The total noise of the auxiliary fan and the terminal smoke fan is calculated based on the rotational speed of the auxiliary fan and the rotational speed of the terminal smoke fan.

[0026] The operating point of the auxiliary fan is gradually changed, and a cyclic calculation is started to obtain multiple total noise levels. The multiple total noise levels are compared to determine the minimum total noise level.

[0027] In some implementations, the step of matching the operating conditions of the auxiliary fan and the terminal smoke hood by combining the actual required air volume and the required total pressure rise to obtain the target speed of the auxiliary fan and the target speed of the terminal smoke hood includes:

[0028] The operating conditions of the auxiliary fan and the terminal smoke fan are matched based on the actual required air volume and the required total pressure rise to maximize the overall efficiency of the auxiliary fan and the terminal smoke fan;

[0029] The target speed of the auxiliary fan and the target speed of the terminal smoke fan are determined based on the maximum overall efficiency.

[0030] In some embodiments, matching the operating conditions of the auxiliary fan and the terminal smoke hood by combining the actual required air volume and the required total pressure rise to maximize the overall efficiency of the auxiliary fan and the terminal smoke hood includes:

[0031] Based on the actual required air volume for each floor, specify the operating point of the auxiliary fan, and calculate the pressure rise and speed corresponding to the operating point;

[0032] When the operating point of the auxiliary fan is within the first preset efficiency range, the pressure rise of the terminal smoke hood is determined according to the required total pressure rise of each floor and the pressure rise of the auxiliary fan;

[0033] The rotation speed of the terminal range hood is determined based on the actual air volume required on each floor and the pressure rise of the terminal range hood.

[0034] When the operating point of the auxiliary fan is within the first preset efficiency range and the operating point of the terminal smoke hood is within the second preset efficiency range, the total efficiency of the auxiliary fan and the terminal smoke hood is determined to be the maximum.

[0035] In some implementations, the step of matching the operating conditions of the auxiliary fan and the terminal smoke hood by combining the actual required air volume and the required total pressure rise to obtain the target speed of the auxiliary fan and the target speed of the terminal smoke hood includes:

[0036] The operating conditions of the auxiliary fan and the terminal smoke fan are matched based on the actual required air volume and the required total pressure rise to minimize the target speed of the terminal smoke fan.

[0037] In some implementations, matching the operating conditions of the auxiliary fan and the terminal exhaust fan by combining the actual required air volume and the required total pressure rise to minimize the target speed of the terminal exhaust fan includes:

[0038] The operating point of the auxiliary fan is determined based on the actual required air volume of each floor and the maximum speed of the auxiliary fan. The operating point includes the maximum pressure rise of the auxiliary fan.

[0039] The minimum total pressure of the terminal exhaust fan is determined based on the actual required air volume of each floor and the operating curve of the terminal exhaust fan.

[0040] If the sum of the maximum pressure rise of the auxiliary fan and the minimum total pressure of the terminal smoke hood is greater than the required total pressure rise of each floor, the target speed of the terminal smoke hood is determined based on the required actual air volume and the minimum total pressure of the terminal smoke hood.

[0041] The total pressure rise of the auxiliary fan is determined based on the required total pressure rise and the minimum total pressure of the terminal smoke hood;

[0042] The target rotational speed of the auxiliary fan is determined based on the total pressure rise of the auxiliary fan and the required actual air volume.

[0043] In some embodiments, the control method further includes:

[0044] If the sum of the maximum pressure rise of the auxiliary fan and the minimum total pressure of the terminal smoke hood is less than the required total pressure rise of each floor, the maximum speed of the auxiliary fan is determined as the target speed of the auxiliary fan, and the total pressure rise of the terminal smoke hood is determined according to the required total pressure rise and the maximum pressure rise of the auxiliary fan.

[0045] The target rotational speed of the terminal range hood is determined based on the actual required air volume and the total pressure rise of the terminal range hood.

[0046] A control device for a central smoke machine system according to an embodiment of the present invention includes:

[0047] processor; and

[0048] The memory stores a computer program that, when executed by the processor, implements the steps of the control method for the central tobacco machine system according to any of the above embodiments.

[0049] A central smoke machine system according to an embodiment of the present invention includes the control device of the central smoke machine system of the above embodiment.

[0050] This invention provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the control method for the central smoke machine system of any of the above embodiments.

[0051] The aforementioned control device, central smoke control system, and computer-readable storage medium, by adding auxiliary fans to the terminal smoke control units and matching the operating conditions of the auxiliary fans and terminal smoke control units to obtain appropriate speeds based on the actual required air volume and total pressure rise of each floor, broaden the coverage of the total pressure difference between the two floors, significantly expanding the operating condition coverage of the central smoke control system. Furthermore, the total pressure rise can also be provided by the auxiliary fans, reducing the pressure rise at the terminal smoke control units and thus improving noise levels.

[0052] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0053] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0054] Figure 1 This is a flowchart illustrating the control method of the central smoke machine system according to an embodiment of the present invention;

[0055] Figure 2 This is an installation diagram of the central smoke machine system according to an embodiment of the present invention;

[0056] Figures 3 to 10 This is a flowchart illustrating the control method according to an embodiment of the present invention;

[0057] Figures 11a to 14b This is a schematic diagram of the performance curves of the auxiliary fan and the terminal smoke fan according to an embodiment of the present invention;

[0058] Figure 15 This is a schematic diagram of the central smoke machine system according to an embodiment of the present invention;

[0059] Figure 16 This is a structural diagram of a traditional smoke extraction system for high-rise residential buildings in related technologies;

[0060] Figure 17 This is a schematic diagram of a centralized central smoke machine system in related technologies;

[0061] Figure 18 This is a schematic diagram of the structure of a distributed central smoke machine system in related technologies.

[0062] Reference numerals: Auxiliary fan 12, terminal smoke fan 14, terminal smoke duct 16, common smoke duct 18, control center 20, top fan 22, check valve 24, processor 26, memory 28, central smoke fan system 100, control device 200. Detailed Implementation

[0063] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0064] In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0065] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0066] In this invention, unless otherwise expressly specified and limited, the first feature "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them.

[0067] This disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described herein. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0068] Currently, traditional smoke extraction systems in high-rise residential buildings consist of a shared smoke duct (also known as a shared smoke exhaust pipe) and branch lines at each user's end. For example... Figure 16 As shown, check valves, range hoods, and corrugated pipes constitute branch lines for each floor. Fumes from the user end are discharged from these branch lines into the common flue, then flow upwards along the common flue and are discharged from the top. For lower-floor users, the exhaust resistance mainly comes from the common flue, including friction losses along the flue and merging losses when passing through the exhaust vents of the branch lines for users on upper floors. Therefore, when there are many open floors, the exhaust resistance for lower-floor users is higher, resulting in insufficient airflow from the range hood and poor actual exhaust performance. Although range hood technology is constantly evolving towards higher airflow and lower noise, extremely high exhaust resistance in some practical applications makes it impossible to simultaneously achieve both high airflow and low noise levels. Furthermore, the significant difference in exhaust resistance between upper and lower floors creates an awkward situation where upper-floor users have excessive airflow while lower-floor users have insufficient airflow, leading to poor exhaust performance for lower-floor users and energy waste for upper-floor users. In addition, to prevent backflow of cooking fumes from the public flue into the user's end, a passive flue check valve is usually installed at the interface between the user's branch circuit and the public flue. When the user's range hood is off, the flue check valve is usually kept closed by the spring force and the weight of the valve plate, preventing cooking fumes from the public flue from flowing into the user's branch circuit. When the user's range hood is on, the fluid discharged from the branch circuit into the public flue overcomes the spring force and the weight of the valve plate, causing the valve plate to open. However, this type of passive check valve has the following disadvantages: ① When the airflow in the branch circuit is low, the valve plate opening angle is too small, resulting in high exhaust resistance; ② Problems such as aging and failure of the flue check valve spring and oil fume adhesion on the valve plate can affect the sealing performance when the valve plate is closed, leading to backflow of cooking fumes.

[0069] Therefore, the smoke extraction problem in high-rise residential buildings is a systemic issue that requires system-level control measures to solve. This is where central smoke extraction systems come in. Central smoke extraction systems typically use top-mounted fans located at the public smoke duct outlet as the main or sole power source. Based on the airflow demand from users, the main unit coordinates and controls the operating status of all components of the entire smoke extraction system in real time, meeting the smoke extraction needs of users under all operating conditions.

[0070] Based on the branch power distribution method, central smoke machine systems can be divided into two categories: centralized and distributed. Schematic diagrams of the two types of central smoke machine systems are shown below. Figure 17 and Figure 18As shown. In a centralized central exhaust system, each branch has only a smoke collection hood, not a range hood. The entire system uses a top-mounted fan as its sole power source. At the interface between a branch and the common exhaust duct, a power-operated check valve (also called an electrically controlled valve) with an adjustable valve opening angle is installed. During system operation, the airflow distribution within the branch can be achieved by adjusting the valve opening angle. In a distributed central exhaust system, each branch has an adjustable-speed range hood. The entire system uses a top-mounted fan as the primary power source, with the branch range hoods serving as auxiliary power sources. At the branch outlet, a power-operated check valve with an adjustable valve opening angle is installed. This check valve has only two states: ON / OFF (fully open / fully closed). During system operation, the airflow distribution within the branch can be achieved by adjusting the speed of the branch range hood. The power check valve's operation is linked to the terminal range hood's operation; when the terminal range hood is on, the power check valve is in the ON state; when the terminal range hood is off, the power check valve is in the OFF state.

[0071] Due to differences in system components and operating mechanisms, the two types of central exhaust fan systems each have their own advantages. The advantages of a centralized central exhaust fan system are mainly reflected in the following aspects: the public exhaust duct is always under full negative pressure, which can strictly prevent oil fumes from flowing back into the user's kitchen from the public exhaust duct; since there are no exhaust fans in the branch circuits, the noise of the branch circuits is significantly reduced, with a reduction of up to 10dB; in addition, since there are no exhaust fans occupying space in the branch circuits of a centralized central exhaust fan system, the smoke collection hoods of the branch circuits occupy a smaller size, and the shape design can be more flexible and aesthetically pleasing. The advantages of a distributed central exhaust fan system are mainly reflected in the following aspects: Because the branch check valves of a distributed central exhaust fan system always keep the system fully open when the branch is working, the system resistance is lower than that of a centralized system under the same operating conditions, thus the overall energy consumption level is also better than that of a centralized system; the branch exhaust fans of a distributed system can achieve the oil-fume separation function of traditional exhaust fans, and it is not easy for dirt to accumulate in the terminal exhaust duct (also called the branch exhaust duct); because the distributed central exhaust fan system has branch exhaust fans as auxiliary power sources, the operating parameters of the top fan are less demanding, and when the top fan fails, the exhaust function can still be achieved by relying on the branch exhaust fans, resulting in high system redundancy and high reliability.

[0072] Distributed central range hood systems offer high reliability and are similar to existing systems, making retrofitting relatively easy. However, the noise from terminal range hoods remains a significant pain point for users. Furthermore, due to performance limitations of these terminal range hoods, the relative total pressure difference between the floors with the lowest and highest back pressure should not be too large when uniformly controlling airflow distribution across floors, lest the terminal range hoods fail to meet operating requirements even at maximum speed. These two factors restrict the operational coverage of distributed central range hoods. This invention proposes a control scheme that adds small fans to the terminal flues of a central range hood system. This reduces user-perceived noise at the terminal level and increases the relative total pressure difference within the system, thereby expanding the freely adjustable operational coverage of the central range hood system.

[0073] Please refer to Figure 1 and Figure 2 A control method for a central smoke machine system 100 according to an embodiment of the present invention includes:

[0074] Step 101: Obtain the actual required air volume and the required total pressure rise for each floor;

[0075] Step 103: Match the operating conditions of the auxiliary fan 12 and the terminal smoke fan 14 with the actual required air volume and the required total pressure rise to obtain the target speed of the auxiliary fan 12 and the target speed of the terminal smoke fan 14. The auxiliary fan 12 is installed in the terminal flue 16, and the terminal flue 16 is connected to the common flue 18 and the terminal smoke fan 14.

[0076] Step 105: Control the auxiliary fan 12 to run at the target speed of the auxiliary fan 12, and control the fan of the terminal smoke fan 14 to run at the target speed of the terminal smoke fan 14.

[0077] The above control method, by adding an auxiliary fan 12 to the terminal smoke hood 14 and matching the operating conditions of the auxiliary fan 12 and the terminal smoke hood 14 fans according to the actual required air volume and total pressure rise of the floors to obtain the corresponding speed, and making the auxiliary fan 12 and the terminal smoke hood 14 fans operate at the corresponding speed, widens the coverage range of the total pressure difference between the two floors, significantly expanding the operating condition coverage range of the central smoke hood system 100. Furthermore, the total pressure rise can also be provided by the auxiliary fan 12, reducing the pressure rise at the fan of the terminal smoke hood 14, which is beneficial to improving noise.

[0078] Specifically, the central smoke control system 100 includes auxiliary fans 12 and terminal smoke control fans 14 for all floors. Each floor is equipped with auxiliary fans 12 and terminal smoke control fans 14. The central smoke control system 100 manages the auxiliary fans 12 and terminal smoke control fans 14 located in the same public smoke duct 18 in a unified manner through the control center 20.

[0079] Specifically, the central smoke machine system 100 in this embodiment of the invention can be a distributed central smoke machine system, and its hardware configuration diagram is shown below. Figure 2 As shown. The central smoke control system 100 includes: terminal smoke fans 14, auxiliary fans 12 (or small fans), electric check valves 24, common smoke ducts 18, top vent caps, and other equipment and a control center 20. The top vent caps and other equipment may include a top fan 22 (distributed central smoke control system - with top fan 22) or may not include a top fan 22 (distributed central smoke control system - without top fan 22).

[0080] The control logic of the distributed central smoke fan system is as follows: 1. Obtain the floor number and speed information of each fan in operation; 2. Determine the specific air volume of each floor based on the correspondence between speed and air volume; 3. Calculate the pressure loss of each section based on the resistance coefficient and specific air volume; 4. Summarize the pressure loss of each section to obtain the pressure loss distribution map of the total floor pipeline. Combined with a certain optimization algorithm (principles such as the lowest terminal speed or the lowest speed of the top fan 22), the total pressure rise that each floor needs to overcome to meet the required air volume can be calculated. The specific calculation steps and optimization algorithm can be referred to here without further details. 5. Combining the total pressure rise and air volume, the corresponding operating point can be found on the fan performance curve, the corresponding speed can be determined, and the corresponding speed of each floor is sent to the terminal smoke fan 14 through the control center 20 for strict and precise control.

[0081] In actual use, if the operating conditions of the terminal range hood 14 are severe, with high total pressure rise and air volume, the speed of the terminal range hood 14 will be very high, and the noise will seriously affect the user experience. Increasing the speed of the top fan 22 to enhance the suction of the flue can alleviate the severe operating conditions of the terminal range hood 14 to some extent. However, the distributed central range hood system involves the operating status of all terminal range hoods 14 in the entire building. Increasing the speed of the top fan 22 may cause negative back pressure on other floors with good operating conditions, causing the range hoods to rotate in reverse, which is detrimental to their use. On the other hand, due to the performance limitations of the terminal range hood 14, the good control range of the motor is limited to the minimum and maximum speeds. If the total pressure difference between two floors is too large, even when the range hoods on the two floors are operating at their maximum and minimum speeds respectively, the required total back pressure difference cannot be achieved, and the central range hood system 100 cannot cover this operating condition. Adding an auxiliary fan 12 to the terminal flue 16 (such as at the electric check valve 24) can solve the two problems mentioned above. The auxiliary fan 12 provides a total pressure rise, reducing the pressure rise at the terminal range hood 14, thus decreasing the rotational speed and noise. Furthermore, the auxiliary fan 12 provides a total pressure rise, widening the coverage of the total pressure difference between the two floors: the maximum value becomes the maximum total pressure rise provided by the auxiliary fan 12 added to the pressure difference between the highest and lowest fan speeds, significantly expanding the operating range of the central range hood system 100. In some embodiments, the terminal range hood 14 can be a range hood or an integrated kitchen appliance. It is understood that in other embodiments, the auxiliary fan 12 can also be installed at other locations on the terminal range hood 14, not limited to the electric check valve 24, for example, between the electric check valve 24 and the air outlet of the terminal range hood 14, and close to the electric check valve 24. In other embodiments, the central smoke hood system 100 may also employ a passive check valve 24, with the auxiliary fan 12 installed near the passive check valve 24.

[0082] In some implementations, after obtaining the actual required air volume and the required total pressure rise for each floor, the corresponding operating point is not directly found from the performance curve of the terminal range hood 14 to issue the target speed. Instead, it is necessary to match the auxiliary fan 12 and the terminal range hood 14. Under the condition of achieving the required air volume for each floor, the total pressure rise is reasonably divided. Based on the actual operating pressure rise of the terminal range hood 14 and the actual operating pressure rise of the auxiliary fan 12, the operating points of the two are confirmed, and the target speeds of the two are issued.

[0083] In one implementation, a matching module can be added to the control center 20 to match the operating conditions of the auxiliary fan 12 and the terminal smoke fan 14.

[0084] In some implementations, please refer to Figure 3 Step 103 includes:

[0085] Step 107: Match the operating conditions of the auxiliary fan 12 and the terminal smoke fan 14 based on the actual required air volume and the required total pressure rise to minimize the total power of the auxiliary fan 12 and the terminal smoke fan 14.

[0086] Step 109: Determine the target speed of the auxiliary fan 12 and the target speed of the terminal smoke fan 14 based on the minimum total power.

[0087] In this way, by matching the operating conditions to determine the target speed of the auxiliary fan 12 and the target speed of the terminal smoke fan 14 based on the minimum total power, and controlling the auxiliary fan 12 and the terminal smoke fan 14 respectively according to the two target speeds, energy consumption can be reduced, energy saving and environmental protection can be achieved, and the total noise will also be relatively low.

[0088] Specifically, in this embodiment, an auxiliary fan 12 is installed on the terminal exhaust fan 14. After obtaining the actual required air volume and total pressure rise for each floor, the operating conditions of the auxiliary fan 12 and the terminal exhaust fan 14 are matched based on the actual required air volume and total pressure rise to minimize the total power of the auxiliary fan 12 and the terminal exhaust fan 14. The target speeds of the auxiliary fan 12 and the terminal exhaust fan 14 are determined under the minimum total power of the auxiliary fan 12 and the terminal exhaust fan 14. Operating the auxiliary fan 12 and the terminal exhaust fan 14 according to the determined target speeds ensures that their energy consumption is minimized, thus reducing energy consumption. Furthermore, fan noise is generally positively correlated with power; with the minimum total power, the total noise generated by the auxiliary fan 12 and the terminal exhaust fan 14 will also be relatively low.

[0089] In some implementations, please refer to Figure 4 Step 107 includes:

[0090] Step 111: Based on the actual required air volume for each floor, specify the operating point of the auxiliary fan 12, and calculate the pressure rise and speed corresponding to the operating point;

[0091] Step 113: Determine the pressure rise of the terminal smoke hood 14 based on the required total pressure rise of each floor and the pressure rise of the auxiliary fan 12;

[0092] Step 115: Determine the rotation speed of the terminal range hood 14 based on the actual required air volume of each floor and the pressure rise of the terminal range hood 14.

[0093] Step 117: Calculate the total power of the auxiliary fan 12 and the terminal smoke fan 14 based on the rotational speed of the auxiliary fan 12 and the rotational speed of the terminal smoke fan 14.

[0094] Step 119: Gradually change the operating point specified by the auxiliary fan 12, start cyclic calculation to obtain multiple total power, compare multiple total power to determine the minimum total power.

[0095] In this way, the minimum total power can be accurately obtained.

[0096] In this embodiment, the control center 20 can specify the operating point of the auxiliary fan 12 based on the actual required air volume of each floor, and calculate the pressure rise P1 and speed n1 corresponding to the operating point. The pressure rise (P-P1) of the terminal exhaust fan 14 can be determined based on the total required pressure rise P of each floor and the total pressure rise P1 of the auxiliary fan 12. The speed of the terminal exhaust fan 14 can be determined based on the actual required air volume of each floor and the pressure rise (P-P1) of the terminal exhaust fan 14. The total power of the auxiliary fan 12 and the terminal exhaust fan 14 is calculated based on the speed of the auxiliary fan 12 and the speed of the terminal exhaust fan 14. The operating point specified by the auxiliary fan 12 is gradually changed, and the calculation is cyclically performed to obtain multiple total power values. The multiple total power values ​​are compared to determine the minimum total power value.

[0097] Specifically, please refer to Figures 11a-11d , Figures 11a-11d These are the performance curves of the auxiliary fan 12 and the terminal smoke fan 14, among which... Figure 11a To support the pressure rise of fan 12 and its corresponding air volume curve (PQ line), Figure 11b To assist the power-to-airflow curve (WQ line) of fan 12, Figure 11c The pressure rise of the terminal range hood 14 corresponds to the air volume curve (PQ line). Figure 11d The power-to-airflow curve (WQ line) for the terminal range hood 14 is shown. In the performance curve, Q0 represents the actual airflow required for each floor. The required airflow may differ or be the same for different floors. The flow rate through the terminal range hood 14 and the auxiliary fan 12 is the same on each floor. In one embodiment, the actual required airflow can be determined by the setting of the terminal range hood 14.

[0098] In this embodiment, the control logic of the matching module between the auxiliary fan 12 and the terminal smoke hood 14 is as follows: Based on the actual required air volume of each floor obtained in step 101, a specified air volume Q0 is assigned to a working point of the auxiliary fan 12. (See [reference]) Figure 11a The operating point (P1, n1, Q0) of the auxiliary fan 12 is obtained by calculating the pressure rise and speed corresponding to the specified air volume Q0 at the operating point. Based on the required total pressure rise P for each floor and the pressure rise P1 of the auxiliary fan 12, the pressure rise P-P1 of the terminal smoke hood 14 is determined. Based on the pressure rise P-P1 of the terminal smoke hood 14, the operating pressure rise of the terminal smoke hood 14 can be obtained as P3* (the sum of P3* and P1 is P). See also... Figure 11c Combining P3* and Q0, the operating speed of the terminal smoke hood 14 can be obtained as n3*. (See reference...) Figure 11b and Figure 11d Based on the specified airflow Q0 and the corresponding speeds n1 of the auxiliary fan 12 and n3* of the terminal smoke hood 14, the corresponding operating points can be found on the power-to-airflow curve (WQ line) of the respective fans. For the auxiliary fan 12, the operating point is Q0-n1-W1; for the terminal smoke hood 14, it is Q0-n3*-W3*. The sum of the power of the two fans is W1+W3*. To change the operating point of the auxiliary fan 12, refer to [reference needed]. Figure 11a and Figure 11c The air volume is Q0, the rotational speed is n2, and the pressure rise is P2. At this time, the auxiliary fan 12 operates at a rotational speed of n2, providing a total pressure rise of P2. Therefore, the total pressure rise provided by the terminal range hood 14 is P2*(P-P2). Combined with the specified air volume Q0, the operating rotational speed of the terminal range hood 14 is n2*. (See also...) Figure 11b and Figure 11d Based on the specified air volume Q0, the corresponding auxiliary fan 12 speed n2, and the corresponding terminal exhaust fan 14 n2*, the corresponding power points are found on the power-to-air volume curve (WQ line): auxiliary fan 12 power W2, terminal exhaust fan 14 power W2*, and the sum of the corresponding power of the two fans is W2 + W2*. Due to motor limitations, auxiliary fan 12 and terminal exhaust fan 14 must have corresponding maximum speed nmax and minimum speed nmin. A certain step size is determined between the maximum and minimum speeds of auxiliary fan 12 (this step size can be determined according to actual conditions, for example, the step size can be 50 rpm), and the specified operating point of auxiliary fan 12 is gradually changed. The calculation is repeated to obtain multiple total power values, and the multiple total power values ​​are compared to determine the minimum total power value.

[0099] In some implementations, please refer to Figure 5 Step 103 includes:

[0100] Step 121: Match the operating conditions of the auxiliary fan 12 and the terminal smoke fan 14 based on the actual required air volume and the required total pressure rise to minimize the total noise of the auxiliary fan 12 and the terminal smoke fan 14.

[0101] Step 123: Determine the target speed of the auxiliary fan 12 and the target speed of the terminal smoke fan 14 based on the minimum total noise.

[0102] In this way, by matching operating conditions to determine the target speed of the auxiliary fan 12 and the target speed of the terminal smoke hood 14 based on the minimum total noise, and controlling the auxiliary fan 12 and the terminal smoke hood 14 with these two target speeds respectively, noise can be reduced and user experience can be improved.

[0103] Specifically, in this embodiment, an auxiliary fan 12 is added to the terminal range hood 14. After obtaining the actual required air volume and total pressure rise for each floor, the operating conditions of the auxiliary fan 12 and the terminal range hood 14 are matched based on the actual required air volume and total pressure rise to minimize the total noise of the auxiliary fan 12 and the terminal range hood 14. The target speeds of the auxiliary fan 12 and the terminal range hood 14 are determined under the minimum total noise level. Operating the auxiliary fan 12 and the terminal range hood 14 according to the determined target speeds ensures minimal noise from both, thus improving the user experience.

[0104] In some implementations, please refer to Figure 6 Step 121 includes:

[0105] Step 125: Based on the actual required air volume of each floor, specify the operating point of the auxiliary fan 12, and calculate the pressure rise and speed corresponding to the operating point;

[0106] Step 127: Determine the pressure rise of the terminal smoke hood 14 based on the required total pressure rise of each floor and the pressure rise of the auxiliary fan 12;

[0107] Step 129: Determine the rotation speed of the terminal range hood 14 based on the actual required air volume of each floor and the pressure rise of the terminal range hood 14;

[0108] Step 131: Calculate the total noise of the auxiliary fan 12 and the terminal smoke fan 14 based on the rotational speed of the auxiliary fan 12 and the rotational speed of the terminal smoke fan 14.

[0109] Step 133: Gradually change the specified operating point of the auxiliary fan 12, start cyclic calculation to obtain multiple total noises, and compare the multiple total noises to determine the minimum total noise.

[0110] In this way, the minimum total noise can be accurately determined.

[0111] In this embodiment, noise can be represented by sound power. The central smoke exhaust system 100, based on the relative positions of the user and the terminal smoke exhaust 14 and auxiliary fan 12, can assess the sound power at the user's location when the terminal smoke exhaust 14 and auxiliary fan 12 are at different operating points. Relevant data can be tested separately in laboratory simulations, and the corresponding characteristic curves are plotted and integrated into the control platform 20 for interpolation in subsequent logic analysis. The control strategy for the matching module of auxiliary fan 12 and terminal smoke exhaust 14 is as follows: An operating point of the auxiliary fan 12 can be specified based on the specific airflow, and the corresponding pressure rise P1 and speed n1 are calculated. Combined with the total pressure rise of the branch, the total pressure rise of the terminal compressor can be determined as (P-P1); the speed of the terminal smoke exhaust 14 can be determined based on the specific airflow and pressure rise P-P1. In the performance curve graph of sound power corresponding to airflow (Lw-Q line), the corresponding operating point is retrieved through the corresponding speed and airflow, the sound power at the user's location is determined, and the two are summed and calculated. This sound power performance curve was obtained beforehand in a simulated scenario by placing microphones at the user's relative position. The sound power can be directly summed from the noise levels of the two fans at the user's position. The specified operating point of the auxiliary fan 12 is gradually changed, and the calculation is repeated cyclically. Finally, the total sound power Lw is compared across all steps, and the condition with the minimum total sound power is selected as the actual operating point.

[0112] In one implementation, noise can be represented by sound pressure level. The sound pressure level test data is related to distance, and the total noise needs to be calculated by superimposing the data after conversion based on the relative positions of the fan and the user.

[0113] Specifically, please refer to Figures 12a-12d , Figures 12a-12d These are the performance curves of the auxiliary fan 12 and the terminal smoke fan 14, among which... Figure 12a To support the pressure rise of fan 12 and its corresponding air volume curve (PQ line), Figure 12b To assist the sound power-to-air volume curve (Lw-Q line) of fan 12, Figure 12c The pressure rise of the terminal range hood 14 corresponds to the air volume curve (PQ line). Figure 12d The sound power-to-airflow curve (Lw-Q line) for the terminal range hood 14 is shown. In the performance curve, Q0 represents the actual airflow required for each floor. The required airflow may differ between floors or may be the same. The flow rate through the terminal range hood 14 and the auxiliary fan 12 is the same on each floor. In one embodiment, the actual required airflow can be determined by the setting of the terminal range hood 14.

[0114] In this embodiment, the control logic of the matching module between the auxiliary fan 12 and the terminal smoke hood 14 is as follows: Based on the actual required air volume of each floor obtained in step 101, a specified air volume Q0 is assigned to a working point of the auxiliary fan 12. (See [reference]) Figure 12aThe operating point (P1, n1, Q0) of the auxiliary fan 12 is obtained by calculating the pressure rise and speed corresponding to the specified air volume Q0 at the operating point. Based on the specified air volume Q0, an operating point (P1, n1, Q0) of the auxiliary fan 12 can be specified. The pressure rise P-P1 of the terminal smoke hood 14 is determined based on the required total pressure rise P of each floor and the pressure rise P1 of the auxiliary fan 12. Based on the pressure rise P-P1 of the terminal smoke hood 14, the operating pressure rise of the terminal smoke hood 14 can be obtained as P3* (the sum of P3* and P1 is P). See also... Figure 12c Combining P3* and Q0, the operating speed of the terminal smoke hood 14 can be obtained as n3*. (See reference...) Figure 12b and Figure 12d Based on the specified airflow Q0 and the corresponding speeds n1 of the auxiliary fan 12 and n3* of the terminal smoke hood 14, the corresponding operating points can be found on the sound power-to-airflow curve (Lw-Q line) of the respective fans. For the auxiliary fan 12, the operating point is Q0-n1-Lw1; for the terminal smoke hood 14, it is Q0-n3*-Lw3*. The sum of the sound power of the two fans is Lw1+Lw3*. To change the operating point of the auxiliary fan 12, refer to [reference needed]. Figure 12a and Figure 12c The air volume is Q0, the rotational speed is n2, and the pressure rise is P2. At this time, the auxiliary fan 12 operates at a rotational speed of n2, providing a total pressure rise of P2. Therefore, the total pressure rise provided by the terminal range hood 14 is P2*(P-P2). Combined with the specified air volume Q0, the operating rotational speed of the terminal range hood 14 is n2*. (See also...) Figure 12b and Figure 12d Based on the specified air volume Q0, the corresponding auxiliary fan 12 speed n2, and the corresponding terminal smoke hood 14 n2*, the corresponding power points are found on the sound power-to-air volume curve (Lw-Q line): the sound power of auxiliary fan 12 is Lw2, the sound power of terminal smoke hood 14 is Lw2*, and the sum of the sound power of the two fans is Lw2 + Lw2*. Due to the limitations of the motors, auxiliary fan 12 and terminal smoke hood 14 must have corresponding maximum speed nmax and minimum speed nmin. A certain step size is determined between the maximum and minimum speeds of auxiliary fan 12 (this step size can be determined according to the actual situation, for example, the step size can be 50 rpm), and the specified operating point of auxiliary fan 12 is gradually changed. The calculation is repeated to obtain multiple total sound power values, and the multiple total sound power values ​​are compared to determine the minimum total sound power.

[0115] In some implementations, please refer to Figure 7 Step 103 includes:

[0116] Step 135: Match the operating conditions of the auxiliary fan 12 and the terminal smoke fan 14 based on the actual required air volume and the required total pressure rise to maximize the total efficiency of the auxiliary fan 12 and the terminal smoke fan 14.

[0117] Step 137: Determine the target speed of the auxiliary fan 12 and the target speed of the terminal smoke fan 14 based on the maximum overall efficiency.

[0118] In this way, by matching operating conditions to determine the target speed of the auxiliary fan 12 and the target speed of the terminal smoke fan 14 based on the maximum overall efficiency, and controlling the auxiliary fan 12 and the terminal smoke fan 14 with these two target speeds respectively, the working efficiency can be improved.

[0119] Specifically, in this embodiment, an auxiliary fan 12 is installed on the terminal exhaust fan 14. After obtaining the actual required air volume and total pressure rise for each floor, the operating conditions of the auxiliary fan 12 and the terminal exhaust fan 14 are matched based on the actual required air volume and total pressure rise to maximize the overall efficiency of the auxiliary fan 12 and the terminal exhaust fan 14. Under the condition of maximizing the overall efficiency of the auxiliary fan 12 and the terminal exhaust fan 14, the target speeds of the auxiliary fan 12 and the terminal exhaust fan 14 are determined. Operating the auxiliary fan 12 and the terminal exhaust fan 14 according to the determined target speeds ensures that their working efficiency is maximized, thus improving the user experience.

[0120] In some implementations, please refer to Figure 8 Step 135 includes:

[0121] Step 139: Based on the actual required air volume of each floor, specify the operating point of the auxiliary fan 12, and calculate the pressure rise and speed corresponding to the operating point;

[0122] Step 141: When the operating point of the auxiliary fan 12 is within the first preset efficiency range, determine the pressure rise of the terminal smoke hood 14 based on the required total pressure rise of each floor and the pressure rise of the auxiliary fan 12.

[0123] Step 143: Determine the rotation speed of the terminal range hood 14 based on the actual required air volume of each floor and the pressure rise of the terminal range hood 14;

[0124] Step 145: When the operating point of the auxiliary fan 12 is within the first preset efficiency range and the operating point of the terminal smoke hood 14 is within the second preset efficiency range, determine that the total efficiency of the auxiliary fan 12 and the terminal smoke hood 14 is maximized.

[0125] In this way, the maximum overall efficiency can be accurately obtained.

[0126] Specifically, based on the specific air volume and the limited range (maximum and minimum speed limits of the auxiliary fan 12 motor), an operating point for the auxiliary fan 12 is specified. The corresponding pressure rise P1 and speed n1 are calculated. The efficiency graph is checked to see if this operating point of the auxiliary fan 12 is within the first preset efficiency range. If so, the next step is to calculate the pressure rise (P-P1) and speed n1* of the terminal smoke hood 14. Otherwise, the process returns to the first step, a new operating point for the auxiliary fan 12 is specified, and the new operating point is checked to see if it is within the first preset efficiency range. After the operating point of the terminal smoke hood 14 is determined, it is also necessary to check if it is within the second preset efficiency range. If so, the speed of the two fans at this time is output as the target speed. Otherwise, the process returns to the first step, a new operating point for the auxiliary fan 12 is specified, and the calculation and logic judgment of whether it is within the preset efficiency range are restarted until a qualified operating point is finally output. The efficiency E-air volume Q curves of the two fans at different speeds are measured in the laboratory beforehand and plotted as curves, which are built into the control platform 20 and directly called during the matching module's calculation. In one embodiment, the first preset efficiency range may be the optimal efficiency range of the auxiliary fan 12, and the second preset efficiency range may be the optimal efficiency range of the fan of the terminal smoke hood 14.

[0127] Specifically, please refer to Figures 13a-13d , Figures 13a-13d These are the performance curves of the auxiliary fan 12 and the terminal smoke fan 14, among which... Figure 13a and Figure 13b To assist the airflow curve (PQ line) and efficiency-to-airflow curve (EQ line) of the fan 12, Figure 13c and Figure 13d The pressure rise corresponding to the air volume curve (PQ line) and the efficiency corresponding to the air volume curve (EQ line) of the terminal range hood 14 are shown.

[0128] In this embodiment, the control logic of the matching module between the auxiliary fan 12 and the terminal smoke hood 14 is as follows: Based on the actual required air volume of each floor obtained in step 101, a specified air volume Q0 is assigned to a working point of the auxiliary fan 12. (See [reference]) Figure 13a The pressure rise and speed corresponding to the specified operating point are calculated using the specified air volume Q0 at that operating point to obtain the operating point (P1, n1, Q0) of the specified auxiliary fan 12. (See reference...) Figure 13b and Figure 13c Select the operating point (Q0, P1, n1) of the auxiliary fan 12, and determine whether Q0 is within the first preset efficiency range Q1 to Q2 (derived from the efficiency-corresponding airflow curve EQ curve at speed n1). If it is within the first preset efficiency range Q1 to Q2, calculate P-P1(P3*), and combine this with the specified airflow Q0 to determine the operating point (Q0, P3*, n3*) of the terminal range hood 14. (See reference...) Figure 13dThe system determines whether Q0 is within the second preset efficiency range Q1*~Q2*. If it is, the operating points n1 and n3* of the two fans are output as the corresponding operating points of Q0. If either of the above two logical judgments is not within the preset efficiency range, the system returns to the first step to reselect the operating point of the auxiliary fan 12, and then performs the calculation of the operating point and the determination of the preset efficiency range until a suitable operating point is finally output.

[0129] In some implementations, step 103 includes:

[0130] The operating conditions of the auxiliary fan 12 and the terminal smoke fan 14 are matched according to the actual required air volume and the required total pressure rise to minimize the target speed of the terminal smoke fan 14.

[0131] In this way, by matching the operating conditions to control the terminal range hood 14 according to the minimum target speed, the noise of the terminal range hood 14 can be reduced and the user experience can be improved.

[0132] Specifically, in this embodiment, an auxiliary fan 12 is installed on the terminal range hood 14. After obtaining the actual required air volume and total pressure rise for each floor, the operating conditions of the auxiliary fan 12 and the terminal range hood 14 are matched based on the actual required air volume and total pressure rise to minimize the target speed of the terminal range hood 14. By matching the operating conditions to control the terminal range hood 14 according to the minimum target speed, the noise at the terminal range hood 14 can be minimized, improving the user experience.

[0133] In some implementations, please refer to Figure 9 The operating conditions of the auxiliary fan 12 and the terminal smoke hood 14 are matched based on the actual required air volume and the required total pressure rise to minimize the target speed of the terminal smoke hood 14, including:

[0134] Step 147: Determine the operating point of the auxiliary fan 12 based on the actual required air volume of each floor and the maximum speed of the auxiliary fan 12. The operating point includes the maximum pressure rise of the auxiliary fan 12.

[0135] Step 149: Determine the minimum total pressure of the terminal range hood 14 based on the actual required air volume of each floor and the operating curve of the terminal range hood 14.

[0136] Step 151: When the sum of the maximum pressure rise of the auxiliary fan 12 and the minimum total pressure of the terminal smoke fan 14 is greater than the required total pressure rise of each floor, the target speed of the terminal smoke fan 14 is determined according to the required actual air volume and the minimum total pressure of the terminal smoke fan 14.

[0137] Step 152: Determine the total pressure rise of the auxiliary fan 12 based on the required total pressure rise and the minimum total pressure of the terminal smoke hood 14;

[0138] Step 153: Determine the target speed of the auxiliary fan 12 based on the total pressure rise of the auxiliary fan 12 and the required actual air volume.

[0139] In this way, the minimum target speed of the terminal range hood 14 can be accurately obtained.

[0140] Due to the limitations of the motor, the fan has maximum and minimum speed restrictions. The operating point of the auxiliary fan 12 is specified as (Q0, Pmax, nmax) based on the specific airflow and the maximum long-term operating speed nmax that the auxiliary fan 12 motor can withstand. Based on the specific airflow and the PQ line of the terminal exhaust fan 14, the operating point with the lowest speed of the terminal exhaust fan 14 is determined, yielding the minimum total pressure P0. The difference between P0 + Pmax and the required pressure rise P for the floor is then compared. If P0 + Pmax > P, it is considered that the auxiliary fan 12 does not need to operate at its maximum speed to meet the condition of the minimum speed of the terminal exhaust fan 14. The operating points of the terminal exhaust fan 14 (P0 and Q0) are fixed, and the pressure difference P - P0 is the required total pressure rise that the auxiliary fan 12 needs to increase. Combined with the airflow Q0, the operating point of the auxiliary fan 12 can be determined. Finally, these two operating points are assigned to the corresponding fans.

[0141] In some implementations, please refer to Figure 10 The control methods also include:

[0142] Step 155: If the sum of the maximum pressure rise of the auxiliary fan 12 and the minimum total pressure of the terminal smoke hood 14 is less than the required total pressure rise of each floor, determine the maximum speed of the auxiliary fan 12 as the target speed of the auxiliary fan 12, and determine the total pressure rise of the terminal smoke hood 14 based on the required total pressure rise and the maximum pressure rise of the auxiliary fan 12.

[0143] Step 157: Determine the target speed of the terminal range hood 14 based on the actual required air volume and the total pressure rise of the terminal range hood 14.

[0144] This allows the terminal range hood 14 to operate at its lowest speed. By controlling the terminal range hood 14 at its lowest speed, noise can be reduced and the user experience can be improved.

[0145] Specifically, the maximum speed of the auxiliary fan 12 is determined as its target speed. Further, the total pressure rise of the terminal flue 14 can be determined, and the final calculated target speed of the terminal flue 14 is the minimum speed required to meet the demand. Operating the terminal flue 14 at this minimum speed significantly reduces noise. Since the auxiliary fan 12 is installed inside the terminal flue 16, far from the terminal flue 14, its noise has a smaller impact on users, thus reducing terminal noise.

[0146] Specifically, if P0 + Pmax < P, it is considered that the auxiliary fan 12 must operate at the maximum speed point, so the operating point of the auxiliary fan 12 is determined as (Q0, Pmax, nmax). The pressure difference P - Pmax is the required pressure lift for the terminal gas turbine 14. Combining with the air volume Q0, the operating speed of the terminal gas turbine 14 can be judged, and the two speeds are sent to the corresponding fans to complete the matching control.

[0147] Specifically, please refer to Figures 14a-14b , Figures 14a-14b which are the performance curves of the auxiliary fan 12 and the terminal gas turbine 14, where Figure 14a is the pressure lift corresponding air volume curve (P - Q curve) of the auxiliary fan 12, Figure 14b is the pressure lift corresponding air volume curve (P - Q curve) of the terminal gas turbine 14.

[0148] The control logic of the matching module for the auxiliary fan 12 and the terminal gas turbine 14 in this embodiment is as follows: According to the P - Q curve of the auxiliary fan 12, the maximum pressure lift of the operating point corresponding to the air volume Q0 and nmax is determined as Pmax; for the terminal gas turbine 14, it needs to be judged according to the specific air volume. Refer to Figure 14b , if Q0 < Q1, it is considered to be in the AB segment. At this time, the minimum speed of the terminal gas turbine 14 is the minimum speed n1 limited by the motor, and the corresponding minimum total pressure P02 can be obtained according to Q0; if Q0 > Q1, it is considered to be in the BC segment. At this time, the minimum speed of the terminal gas turbine 14 only provides the dynamic pressure corresponding to the air volume Q0, and the static pressure is 0 (excluding the test points where the static pressure is negative. When the static pressure is negative, the fan may reverse on some floors, which is not good for the fan). According to the similarity law, the minimum total pressure P01 corresponding to Q0 on the BC line can be obtained. The minimum total pressure P0 of the terminal gas turbine 14 is P01 / P02 according to the relationship between Q0 and Q1. Compare P0 + Pmax with the required P. If P0 + Pmax > P, the terminal gas turbine 14 can operate at a certain operating point on AB or BC. Through Q0, the specific operating speed and the increased total pressure P0 of the terminal gas turbine 14 can be determined. The pressure difference P - P0 = P4 is the operating point of the auxiliary fan 12. Combining with the operating air volume Q0, the speed of the auxiliary fan 12 can be determined as n4. In this way, the corresponding speeds of the two fans can be sent to the corresponding fans. If P0 + Pmax < P, that is, the terminal gas turbine 14 needs to operate on the upper side of the ABC line segment, and the auxiliary fan 12 needs to operate at the maximum speed (Q0, Pmax, nmax). The pressure difference P - Pmax is provided for the terminal gas turbine 14. According to the pressure difference P - Pmax and the specific air volume Q, the corresponding operating point can be determined in Figure 14b , so that the speeds of the two fans are known and the matching is completed.

[0149] Please refer to Figure 15According to an embodiment of the present invention, a control device 200 for a central smoke machine system 100 includes a processor 26 and a memory 28. The memory 28 stores a computer program, which, when executed by the processor 26, implements the steps of the control method for the central smoke machine system 100 of any of the above embodiments.

[0150] Specifically, the control device 200 may include a control center 20. The control device 200 can communicate with the auxiliary fan 12 and the terminal smoke hood 14 wirelessly or via wired means.

[0151] Please refer to Figure 15 A central smoke machine system 100 according to an embodiment of the present invention includes a control device 200 of the central smoke machine system 100 of the above embodiment.

[0152] This invention provides a computer-readable storage medium storing a computer program thereon. When executed by a processor 26, the computer program implements the steps of the control method of the central smoke machine system 100 of any of the above embodiments.

[0153] In one implementation, the steps of the control method for the central smoke machine system 100 implemented by the computer program when executed by the processor 26 include:

[0154] Step 101: Obtain the actual required air volume and the required total pressure rise for each floor;

[0155] Step 103: Match the operating conditions of the auxiliary fan 12 and the terminal smoke fan 14 with the actual required air volume and the required total pressure rise to obtain the target speed of the auxiliary fan 12 and the target speed of the terminal smoke fan 14. The auxiliary fan 12 is installed in the terminal flue 16, and the terminal flue 16 is connected to the common flue 18 and the terminal smoke fan 14.

[0156] Step 105: Control the auxiliary fan 12 to run at the target speed of the auxiliary fan 12, and control the fan of the terminal smoke fan 14 to run at the target speed of the terminal smoke fan 14.

[0157] The aforementioned control device 200, central smoke control system 100, and computer-readable storage medium, by adding an auxiliary fan 12 and matching the operating conditions of the auxiliary fan 12 and the terminal smoke control fans 14 according to the actual required air volume and total pressure rise of each floor, obtain the corresponding speed and enable the auxiliary fan 12 and the terminal smoke control fans 14 to operate at the corresponding speeds. This widens the coverage range of the total pressure difference between the two floors and significantly expands the operating condition coverage range of the central smoke control system 100. Furthermore, the total pressure rise can also be provided by the auxiliary fan 12, reducing the pressure rise at the fans of the terminal smoke control fans 14, which helps to improve noise levels.

[0158] It should be noted that the implementation methods and explanations of the beneficial effects of the above-described detection methods also apply to the control device 200, the central smoke machine system 100, and the computer-readable storage medium in the embodiments of the present invention. To avoid redundancy, they will not be elaborated in detail here.

[0159] In summary, the control method, control device 200, central smoke machine system 100, and computer-readable storage medium of the present invention have at least the following inventive points:

[0160] 1) Clear and specific control logic for matching auxiliary fan 12 and terminal flue hood 14: Minimize the total power of the electronically controlled valve system and terminal flue hood 14.

[0161] When matching the two fans, this embodiment adopts a strategy of minimizing the total power of the electronically controlled valve system and the terminal smoke fan 14. By cyclically traversing all speed operating points within the working range, the power corresponding to each operating point is compared, and the operating point with the minimum total power is selected as the target speed.

[0162] 2) Expand the maximum total pressure difference limit between floors to increase the operating point coverage of the central smoke control system 100:

[0163] Due to the limitations of the motor of the terminal range hood 14, which corresponds to a minimum and maximum speed, the total pressure difference between two floors has a limited range in actual use. If it is too large, it may exceed the capacity of the terminal range hood 14, thus causing the central range hood system 100 to fail to complete the perfect operation of the system under some working conditions. However, after adding the auxiliary fan 12, the additional total pressure increase brought by the auxiliary fan 12 can widen the limited range of the maximum total pressure difference between floors, thereby increasing the operating point coverage of the central range hood system 100 and improving the integrity of the system.

[0164] 3) Reduce the speed of the terminal range hood 14 and lower terminal noise:

[0165] By adding an auxiliary fan 12, the total pressure rise of the branch can be partially provided by the auxiliary fan 12, the operating point of the terminal smoke hood 14 will shift to a lower speed direction, and the noise generated by the terminal smoke hood 14 will be significantly reduced. Since the auxiliary fan 12 is installed at the electric check valve 24, which is far away from the terminal smoke hood 14, the noise of the auxiliary fan 12 has a smaller impact on the user, thereby achieving the purpose of reducing terminal noise.

[0166] 4) Simple to modify and highly operable:

[0167] The modification only requires adding the auxiliary fan 12 to the electric check valve 24, adding a matching module for the auxiliary fan 12 and the terminal smoke hood 14 to the operating logic of the built-in central smoke hood system 100, and adding the relevant performance curves for the auxiliary fan 12. The above operations are completed through the middleware platform. This modification can be easily carried out in the existing distributed central smoke hood system.

[0168] It is understood that a computer program includes computer program code. Computer program code can be in the form of source code, object code, executable files, or certain intermediate forms. Computer-readable storage media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, external hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution media, etc. The processor can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0169] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0170] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A control method for a central smoke machine system, characterized in that, include: Obtain the actual required air volume and the required total pressure rise for each floor; The operating conditions of the auxiliary fan and the terminal flue are matched based on the actual required air volume and the required total pressure rise to obtain the target speed of the auxiliary fan and the target speed of the terminal flue. The auxiliary fan is installed in the terminal flue, which is connected to the common flue and the terminal flue. Control the auxiliary fan to operate at the target speed of the auxiliary fan, and control the fan of the terminal smoke fan to operate at the target speed of the terminal smoke fan; The process of matching the operating conditions of the auxiliary fan and the terminal smoke hood by combining the actual required air volume and the required total pressure rise to obtain the target speed of the auxiliary fan and the target speed of the terminal smoke hood includes: The operating conditions of the auxiliary fan and the terminal smoke fan are matched based on the actual required air volume and the required total pressure rise to minimize the total power of the auxiliary fan and the terminal smoke fan; The target speed of the auxiliary fan and the target speed of the terminal smoke hood are determined based on the minimum total power; the matching of the operating conditions of the auxiliary fan and the terminal smoke hood with the actual required air volume and the required total pressure rise to minimize the total power of the auxiliary fan and the terminal smoke hood includes: Based on the actual required air volume for each floor, specify the operating point of the auxiliary fan, and calculate the pressure rise and speed corresponding to the operating point; The pressure rise of the terminal smoke hood is determined based on the required total pressure rise of each floor and the pressure rise of the auxiliary fan; The rotation speed of the terminal range hood is determined based on the actual air volume required on each floor and the pressure rise of the terminal range hood. The total power of the auxiliary fan and the terminal smoke fan is calculated based on the rotational speed of the auxiliary fan and the rotational speed of the terminal smoke fan. Gradually change the specified operating point of the auxiliary fan, begin iterative calculation to obtain multiple total power values, compare the multiple total power values ​​to determine the minimum total power value; or, The process of matching the operating conditions of the auxiliary fan and the terminal smoke hood by combining the actual required air volume and the required total pressure rise to obtain the target speed of the auxiliary fan and the target speed of the terminal smoke hood includes: The operating conditions of the auxiliary fan and the terminal smoke fan are matched based on the actual required air volume and the required total pressure rise to minimize the total noise of the auxiliary fan and the terminal smoke fan; The target speed of the auxiliary fan and the target speed of the terminal smoke fan are determined based on minimizing the total noise. The process of matching the operating conditions of the auxiliary fan and the terminal smoke fan in conjunction with the actual required air volume and the required total pressure rise to minimize the total noise of the auxiliary fan and the terminal smoke fan includes: Based on the actual required air volume for each floor, specify the operating point of the auxiliary fan, and calculate the pressure rise and speed corresponding to the operating point; The pressure rise of the terminal smoke hood is determined based on the required total pressure rise of each floor and the pressure rise of the auxiliary fan; The rotation speed of the terminal range hood is determined based on the actual required air volume of each floor and the pressure rise of the terminal range hood. The total noise of the auxiliary fan and the terminal smoke fan is calculated based on the rotational speed of the auxiliary fan and the rotational speed of the terminal smoke fan. Gradually change the specified operating point of the auxiliary fan, begin iterative calculations to obtain multiple total noise levels, compare the multiple total noise levels to determine the minimum total noise; or, The process of matching the operating conditions of the auxiliary fan and the terminal smoke hood by combining the actual required air volume and the required total pressure rise to obtain the target speed of the auxiliary fan and the target speed of the terminal smoke hood includes: The operating conditions of the auxiliary fan and the terminal smoke fan are matched based on the actual required air volume and the required total pressure rise to maximize the overall efficiency of the auxiliary fan and the terminal smoke fan; The target speed of the auxiliary fan and the target speed of the terminal smoke hood are determined based on the maximum overall efficiency; the matching of the operating conditions of the auxiliary fan and the terminal smoke hood with the actual required air volume and the required total pressure rise to maximize the overall efficiency of the auxiliary fan and the terminal smoke hood includes: Based on the actual required air volume for each floor, specify the operating point of the auxiliary fan, and calculate the pressure rise and speed corresponding to the operating point; When the operating point of the auxiliary fan is within the first preset efficiency range, the pressure rise of the terminal smoke hood is determined according to the required total pressure rise of each floor and the pressure rise of the auxiliary fan; The rotation speed of the terminal range hood is determined based on the actual required air volume of each floor and the pressure rise of the terminal range hood. When the operating point of the auxiliary fan is within the first preset efficiency range and the operating point of the terminal smoke hood is within the second preset efficiency range, the total efficiency of the auxiliary fan and the terminal smoke hood is determined to be maximized; or, the step of matching the operating conditions of the auxiliary fan and the terminal smoke hood by combining the actual required air volume and the required total pressure rise to obtain the target speed of the auxiliary fan and the target speed of the terminal smoke hood includes: The operating conditions of the auxiliary fan and the terminal exhaust fan are matched based on the actual required air volume and the required total pressure rise to minimize the target speed of the terminal exhaust fan; the matching of operating conditions of the auxiliary fan and the terminal exhaust fan based on the actual required air volume and the required total pressure rise to minimize the target speed of the terminal exhaust fan includes: The operating point of the auxiliary fan is determined based on the actual required air volume of each floor and the maximum speed of the auxiliary fan. The operating point includes the maximum pressure rise of the auxiliary fan. The minimum total pressure of the terminal exhaust fan is determined based on the actual required air volume of each floor and the operating curve of the terminal exhaust fan. If the sum of the maximum pressure rise of the auxiliary fan and the minimum total pressure of the terminal smoke hood is greater than the required total pressure rise of each floor, the target speed of the terminal smoke hood is determined based on the required actual air volume and the minimum total pressure of the terminal smoke hood. The total pressure rise of the auxiliary fan is determined based on the required total pressure rise and the minimum total pressure of the terminal smoke hood; The target rotational speed of the auxiliary fan is determined based on the total pressure rise of the auxiliary fan and the required actual air volume; the control method further includes: If the sum of the maximum pressure rise of the auxiliary fan and the minimum total pressure of the terminal smoke hood is less than the required total pressure rise of each floor, the maximum speed of the auxiliary fan is determined as the target speed of the auxiliary fan, and the total pressure rise of the terminal smoke hood is determined according to the required total pressure rise and the maximum pressure rise of the auxiliary fan. The target rotational speed of the terminal range hood is determined based on the actual required air volume and the total pressure rise of the terminal range hood.

2. A control device for a central smoke machine system, characterized in that, include: processor; and The memory stores a computer program that, when executed by the processor, implements the steps of the control method for the central tobacco machine system according to claim 1.

3. A central smoke-making system, characterized in that, Includes the control device for the central smoke machine system as described in claim 2.

4. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the control method for the central smoke machine system as described in claim 1.

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