A disinfection control method for a shared direct drinking water equipment based on an internet of things

Abstract

This invention belongs to the field of equipment disinfection control technology, specifically disclosing a disinfection control method for shared direct drinking water equipment based on the Internet of Things. The method includes: acquiring the length, diameter, current idle time, and cumulative outflow of each branch pipe; normalizing and merging the extreme values ​​of each parameter based on their extreme values ​​to obtain a relative biofilm consumption index; for each branch pipe, using the minimum effective concentration required for sterilization at the end as the initial injection concentration, dynamically determining the concentration compensation step size based on its length and relative biofilm consumption index, gradually increasing the injection concentration and calculating the effective concentration at the end until the end reaches the target, thus obtaining the target injection concentration for that branch; and using the maximum value of the target injection concentration among all branches as the main unit injection concentration for disinfection. This invention can accurately quantify the differences in disinfectant consumption among each branch, eliminate disinfection blind spots, and avoid disinfectant waste.

Description

Technical Field

[0001] This invention belongs to the field of equipment disinfection control technology, and more specifically, relates to a disinfection control method for shared direct drinking water equipment based on the Internet of Things. Background Technology

[0002] Shared drinking water equipment typically consists of a main unit and several branch pipes. Each branch pipe has a water dispensing terminal at the end. To ensure water quality safety, the equipment needs to be disinfected regularly. The common method is to inject disinfectant containing chlorine or other effective ingredients into the pipes.

[0003] The effective components of disinfectant are continuously consumed when they react with the pipe walls, residual biofilm inside the pipes, and reducing substances in the water. The concentration decreases with the flow distance, and biofilm will form on the inner wall of the pipes after long-term use, which has an additional consumption effect on the disinfectant.

[0004] Currently, a disinfection control strategy using a fixed injection concentration is adopted for all branches, without considering the differences in attenuation along the pipeline caused by the differences in the length of each branch and the degree of biofilm accumulation. This results in the actual effective concentration at the end of branches with longer lengths or thicker biofilms being lower than the minimum threshold required for sterilization, thus creating a disinfection blind zone on the inner wall of the end of such branches, making it impossible to guarantee that the end of each branch achieves the expected disinfection effect. Summary of the Invention

[0005] In view of this, in order to solve the above problems, a disinfection control method for shared direct drinking water equipment based on the Internet of Things is proposed.

[0006] The objective of this invention can be achieved through the following technical solution: This invention provides a disinfection control method for shared direct drinking water equipment based on the Internet of Things, the method comprising: obtaining the length, diameter, current idle time and cumulative outflow of each branch pipe corresponding to the shared direct drinking water equipment.

[0007] Using the maximum length, maximum current idle time, minimum pipe diameter, and maximum cumulative outflow rate of all branch pipes as reference benchmarks, the length, pipe diameter, idle time, and cumulative outflow rate of each branch pipe are normalized relative to the reference benchmarks and then fused together to obtain the relative biofilm consumption index of each branch pipe.

[0008] For each branch pipeline, the initial injection concentration is the lowest effective concentration at the end required for sterilization. The concentration compensation step size is dynamically determined based on the length of the branch pipeline and the relative biofilm consumption index. The injection concentration is gradually increased according to this step size. The effective concentration at the end is calculated after each increase until the effective concentration at the end is not lower than the lowest effective concentration at the end for the first time. The cumulative injection concentration is then taken as the target injection concentration.

[0009] The maximum value of the target injection concentration in all branches is used as the host injection concentration for disinfectant injection.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention is based on obtaining the length, diameter, current idle time and cumulative outflow of each branch pipe, and using its extreme value as a reference, and calculates the relative biofilm consumption index of each branch through multi-parameter extreme value normalization. This solves the technical problem that the existing method cannot quantify the difference in disinfectant consumption capacity of different branches under the dual effects of pipe wall geometric decay and biofilm interference, and realizes the personalized quantification of disinfectant consumption characteristics along the pipeline of each branch pipe, providing an accurate basis for subsequent differential concentration compensation.

[0011] (2) Based on the relative biofilm consumption index and length of each branch, this invention achieves adaptive determination of the minimum injection concentration required for each branch pipeline by gradually increasing the injection concentration until the end reaches the standard through a compensation mechanism, providing an independent demand benchmark for each branch for subsequent main unit injection concentration decisions.

[0012] (3) The present invention is based on the target injection concentration determined independently for each branch pipeline, which avoids the waste of disinfectant and unnecessary load on pipeline materials caused by using a uniformly high concentration to ensure that the most unfavorable pipeline meets the standard in the traditional solution. While ensuring the disinfection effect, it is conducive to reducing operation and maintenance costs and extending the service life of equipment. At the same time, by using the maximum value as the main injection concentration for disinfectant injection, the disinfection blind zone caused by insufficient concentration at the end of the most demanding branch is effectively avoided, thereby ensuring that the inner wall of the end of all branch pipelines can achieve the expected disinfection effect. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall implementation process of the present invention;

[0014] Figure 2 This is a schematic diagram of the calculation process for the relative biofilm consumption index of the present invention;

[0015] Figure 3 This is a schematic diagram of the concentration compensation step size determination process of the present invention. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Currently, a fixed injection concentration is typically used for all branch lines. However, when there are branch lines that are long or have thick biofilms, the fixed concentration strategy can lead to the actual effective concentration at the end of the branch being lower than the sterilization threshold, thus creating a disinfection blind zone at the end of such branch lines and failing to guarantee that each branch line achieves the expected disinfection effect.

[0018] This invention discloses a disinfection control method for shared direct drinking water equipment based on the Internet of Things. By calculating the relative biofilm consumption index of each branch pipe and determining the concentration compensation step size in combination with the length of the branch pipe, the maximum target injection concentration required in all branch pipes is used as the main unit injection concentration for disinfection. This method can effectively ensure that the end of each branch pipe reaches an effective sterilization concentration and eliminate disinfection blind spots.

[0019] Please refer to details. Figure 1 As shown, the present invention provides a disinfection control method for shared direct drinking water equipment based on the Internet of Things. The method includes: S1, obtaining the length, diameter, current idle time and cumulative water flow of each branch pipe corresponding to the shared direct drinking water equipment.

[0020] Specifically, the length and diameter of the branch pipes can be directly read from the design drawings or parameter specifications of the shared drinking water equipment.

[0021] The current idle time refers to the length of time between the end of the last water intake event at the water intake terminal at the end of the branch pipeline and the start of the current disinfection. For example, if the water intake terminal at the end of a branch pipeline completes its last water intake at 10:00 AM and the current disinfection start time is 10:30 AM, then the current idle time of that branch pipeline is 30 minutes.

[0022] Furthermore, the cumulative outflow rate is obtained by reading the flow data in real time from the flow meter installed at the outlet of each branch pipe, and accumulating the total water volume flowing out of that branch pipe from the time of completion of the last disinfection to the time of start of the current disinfection. For example, if the total water volume measured by the flow meter at the outlet of a certain branch pipe from the time of completion of the last disinfection to the time of start of the current disinfection is 500 liters, then the cumulative outflow rate of that branch pipe is 500 liters.

[0023] After obtaining the length, diameter, current idle time, and cumulative outflow of each branch pipe according to the above steps, continue with the following steps.

[0024] S2. Using the maximum length, maximum current idle time, minimum pipe diameter, and maximum cumulative outflow rate of all branch pipes as reference benchmarks, the length, pipe diameter, idle time, and cumulative outflow rate of each branch pipe are normalized relative to the reference benchmarks and then fused together to obtain the relative biofilm consumption index of each branch pipe.

[0025] Considering that the effective components of disinfectant are continuously consumed during transmission through branch pipelines due to reactions with the pipe walls, residual biofilm within the pipes, and reducing substances in the water, the concentration decreases exponentially with the flow distance. Different branch pipelines vary in length, diameter, idle time, and cumulative outflow rate, leading to different overall disinfectant consumption rates in each pipeline. If these differences cannot be quantified, it is difficult to determine the appropriate injection concentration for each branch pipeline, potentially resulting in insufficient effective concentration at the ends of longer pipelines or those with thicker biofilm accumulation.

[0026] Based on this, the present invention constructs a relative biofilm consumption index, wherein the relative biofilm consumption index is used to characterize the relative consumption rate of the effective components of disinfectant in each branch pipeline under the combined effects of geometric attenuation (determined by length and pipe diameter) and biofilm interference (determined by idle time and cumulative outflow rate).

[0027] Specifically, please refer to Figure 2 As shown, the specific process for calculating the relative biofilm consumption index of each branch pipeline includes: S21, for each branch pipeline, calculate the ratio of the length of the branch pipeline to the maximum length of all branch pipelines, and the ratio of the minimum diameter of all branch pipelines to the diameter of the branch pipeline, and multiply the two ratios to obtain the geometric attenuation influence coefficient.

[0028] Understandably, the geometric attenuation effect coefficient is used to quantify the contribution of inherent pipeline geometry to the attenuation of disinfectant concentration along the pipeline. The length ratio reflects the difference in the length of the disinfectant's transport path within the pipeline. The longer the pipeline, the longer the total path for the disinfectant to react with the pipe wall and deposits within the pipe, resulting in greater consumption of the active ingredient and a larger attenuation ratio of the terminal concentration relative to the injected concentration. The pipe diameter ratio reflects the specific surface area effect of the pipe wall reaction. At the same flow rate, the smaller the pipe diameter, the larger the surface area of ​​the pipe wall that a unit volume of disinfectant contacts, the higher the rate constant of the wall reaction, and the faster the concentration decreases. This ratio ensures that the branch pipeline with the smallest diameter receives the largest geometric attenuation effect coefficient (equal to 1), while the larger diameter pipelines are proportionally reduced.

[0029] S22. Calculate the ratio of the current idle time of the branch pipe to the maximum current idle time of all branch pipes to obtain the idle ratio. At the same time, calculate the ratio of the cumulative outflow of the branch pipe to the maximum cumulative outflow of all branch pipes to obtain the flow ratio. Subtract the flow ratio from 1 to obtain the outflow ratio. Multiply the idle ratio and the outflow ratio to obtain the biofilm interference factor.

[0030] Understandably, the biofilm interference factor is used to quantify the contribution of biofilm accumulation on the inner wall of pipelines to the additional consumption of disinfectant. Under waterless flow conditions, the longer the idle time, the more easily the biofilm thickens and densifies, enhancing its adsorption and consumption capacity of the effective components in the disinfectant. A lower cumulative outflow indicates a weaker physical flushing effect of water flow on the biofilm, resulting in a higher degree of biofilm accumulation. In other words, the longer the idle time and the lower the cumulative outflow, the more severe the biofilm accumulation in the pipeline, and the higher the biofilm interference factor, indicating a more severe additional consumption of disinfectant by the biofilm in that branch pipeline.

[0031] S23. Using the sum of 1 and the biofilm interference factor as the interference correction factor, calculate the product of the geometrical attenuation influence coefficient and the interference correction factor to obtain the relative biofilm consumption index. .

[0032] The form of a sum of 1 and the biofilm interference factor is adopted, such that when the biofilm interference factor is zero (i.e., both the idle time and cumulative effluent flow rate are at their most favorable conditions), the interference correction factor equals 1. It is entirely determined by the geometrical attenuation effect coefficient. When the biofilm interference factor is greater than zero, The effect of biofilm is superimposed on geometric decay.

[0033] It should be noted that, considering the cumulative effect of biofilm, long-term idleness will result in a thicker biofilm. Relying solely on the current idle time will underestimate its consumption capacity. Therefore, the calculation of the idle ratio also includes a correction step, which specifically includes: obtaining the historical maximum idle time corresponding to the branch pipeline.

[0034] If the current idle time is 0, no correction will be performed.

[0035] If the current idle time is greater than 0 and the historical maximum idle time is greater than the current idle time, calculate the correction factor. , , This represents the longest period of idle time in history. Current idle time, This is the preset maximum correction factor.

[0036] Multiply the idle ratio by the correction factor to obtain the corrected idle ratio, and use it as the final idle ratio. If the corrected idle ratio is greater than 1, then set the final idle ratio to 1.

[0037] It should be noted that the maximum correction factor is determined based on the branch pipe material and biofilm growth patterns, according to the following empirical rules: For plastic pipes (such as UPVC, PE, PPR), their surfaces are relatively rough and lack antibacterial properties, making them prone to biofilm growth, and the effects of historical inactivity are relatively long-lasting. Therefore, the enhancement effect of historical inactivity on biofilm consumption capacity is relatively limited. The value is 2.

[0038] For metal pipes (such as stainless steel and copper), their smooth surfaces have antibacterial properties, biofilm growth is slow, and the effects of historical idle time dissipate more quickly due to the antibacterial effect of metal ions. Therefore, the enhancing effect of historical idle time is more pronounced. The value is 4.

[0039] For materials that fall between the two (such as composite pipes), their properties are between those of plastic and metal. Take 3. This embodiment uses UPVC pipe as an example. The final value is 2.

[0040] It should also be noted that the historical maximum idle time is recorded by the IoT platform as the idle time between the end of each water intake event and the start of the next water intake event for each branch pipeline since the equipment was put into use, and the historical maximum value of that branch pipeline is continuously updated. The historical maximum idle time of each branch pipeline is stored in the non-volatile memory of the cloud server or the local controller, and the corresponding historical maximum idle time can be directly read at the start of each disinfection.

[0041] The above corrections can make subsequent biofilm interference factors more accurately reflect the actual biofilm consumption level in the pipeline, providing a reliable basis for subsequent concentration compensation.

[0042] This step, by constructing a relative biofilm consumption index, can quantify the differences in disinfectant consumption rates caused by differences in geometric dimensions, idle time, and cumulative outflow rate in each branch pipeline, providing a unified quantitative benchmark for subsequent differentiated concentration compensation.

[0043] S3. For each branch pipeline, the minimum effective concentration at the end required for sterilization is taken as the injection concentration (i.e., the initial injection concentration) when the effective concentration at the end is calculated for the first time. The concentration compensation step size is determined by combining the length of the branch pipeline and the relative biofilm consumption index. The injection concentration is gradually increased according to the concentration compensation step size. The effective concentration at the end is calculated after each increase until the calculated effective concentration at the end is not lower than the minimum effective concentration at the end for the first time. The cumulative injection concentration at this moment is taken as the final target injection concentration.

[0044] Because different branch pipelines differ in length and relative biofilm depletion index, applying the same concentration compensation step size to all pipelines may result in insufficient concentration compensation for long pipelines or pipelines with high depletion index, while excessive compensation may occur for short pipelines or pipelines with low depletion index. Therefore, it is necessary to dynamically determine the concentration compensation step size based on the length and relative biofilm depletion index of each branch pipeline.

[0045] Specifically, please refer to Figure 3As shown in the embodiment of the present invention, the specific process for determining the concentration compensation step size is as follows: For the branch pipeline currently being processed, the length of the branch pipeline is compared with the maximum length of all branch pipelines to obtain the length ratio. Simultaneously, the relative biofilm consumption index of the branch pipeline is compared with the maximum relative biofilm consumption index of all branch pipelines to obtain the consumption ratio.

[0046] Multiply the product of the length ratio and the consumption ratio by the minimum effective concentration at the end required for sterilization to obtain the concentration compensation step size for the branch pipeline currently being processed.

[0047] It should be noted that the length ratio reflects the degree of distance attenuation of the branch pipe relative to the longest pipe, while the consumption ratio reflects the degree of additional biofilm consumption of the branch pipe relative to the highest-consuming pipe. The larger the product of the two, the greater the initial concentration increment required for the pipe to reach the effective concentration at the end. Therefore, by using the lowest effective concentration at the end as a baseline and multiplying it by this product, a concentration compensation step size that matches the actual consumption characteristics of the pipe can be obtained.

[0048] Thus, by dynamically determining the concentration compensation step size for each branch pipeline, this invention can avoid insufficient or excessive compensation caused by a uniform step size, making the subsequent gradually increasing injection concentration more accurately approach the target value required by each pipeline.

[0049] After determining the concentration compensation step size, the injection concentration is gradually increased according to the step size. After each increase, the effective concentration at the end is calculated. The specific calculation process includes: obtaining the current cumulative injection concentration, length, pipe diameter, and relative biofilm consumption index of the currently being treated branch pipe, which are denoted as follows: , , as well as terminal effective concentration The calculation formula is: .

[0050] In the formula, Let be the wall reaction rate constant of the effective component of the disinfectant under given pipe material and water flow conditions. Its physical meaning is the logarithmic decay rate of concentration caused by the ratio of unit length to pipe diameter. This represents an exponential function with the natural constant e as its base.

[0051] Among them, the shared direct drinking water equipment used in this invention, its The value should be determined in advance through the following dynamic cyclic calibration experiment: Construct a test pipe section with the same material and inner diameter as the branch pipe to be tested, and record the length as . The pipe diameter is denoted as Use the disinfectant solution actually used by the equipment (e.g., sodium hypochlorite solution) at the rated injection concentration. The disinfectant solution was kept in stable flow within the test pipe section at a flow rate range suitable for normal equipment operation (e.g., 30 mg / L) and ambient temperature. The effective concentration of the disinfectant solution was measured at both the inlet and outlet of the pipe section. and Calculated using the following formula value: Multiple measurements can be taken and the average value obtained.

[0052] This is the geometric decay term, used to characterize the exponential decay of disinfectant concentration along the pipe as it flows through the pipeline due to reaction with the pipe wall. This reflects the ratio of pipeline length to pipe diameter. The longer the pipeline and the smaller the pipe diameter, the longer the total path and the larger the total contact area between the disinfectant and the pipe wall and sediment. This results in more consumption of the effective ingredients and a more obvious geometric decay. Consequently, the rate of decrease in the terminal concentration relative to the initial concentration is greater, meaning the value of the exponential decay term is smaller, and the final terminal effective concentration is smaller.

[0053] This is the biofilm consumption item, which characterizes the additional consumption capacity of disinfectant by the biofilm on the inner wall of the pipeline, relative to the biofilm consumption index. This comprehensively reflects the additional consumption capacity of disinfectant by the biofilm on the inner wall of the branch pipeline. A higher value indicates a more severe biofilm accumulation within the pipeline. Perform index reduction. The higher the value, the lower the value of the biofilm consumption item, and the further the effective concentration at the end decreases.

[0054] Current injection concentration Multiplying by the geometric decay term and the biofilm consumption term in sequence yields the terminal effective concentration under the combined effects of geometric decay and biofilm interference. It can simultaneously characterize the combined effects of geometric decay and biofilm interference.

[0055] It should be noted that the effective components of the disinfectant are continuously consumed during transmission through pipelines due to reactions with the pipe walls and residues within the pipes. Under engineering approximations, their concentration decreases exponentially along the flow direction. Therefore, this invention employs an exponential function to calculate the effective concentration at the end of the pipeline, providing a quantitative basis for determining whether the concentration at the end of each branch pipeline meets the standard and whether further increases in injection concentration are necessary.

[0056] In the above-described gradual increase process, the injection concentration after each increase is the sum of the initial injection concentration (i.e., the minimum effective concentration required for sterilization) and the concentration compensation steps performed so far. When the effective concentration at the end first meets the requirement of not being lower than the minimum effective concentration required for sterilization, this sum is the final target injection concentration for that branch pipeline.

[0057] It should be noted that during the gradual increase of the injection concentration, if the current injection concentration has reached the maximum tolerance concentration allowed by the branch pipe material, and the calculated effective concentration at the end is still lower than the minimum effective concentration at the end required for sterilization, the increase should be stopped, and the maximum tolerance concentration should be used as the target injection concentration for that branch pipe. At the same time, an alarm message indicating that the disinfection of that branch pipe is not up to standard should be generated.

[0058] It should be noted that sodium hypochlorite is used as the disinfectant in this embodiment, and the minimum effective concentration required for sterilization is set at 0.3 mg / L (calculated as free chlorine) according to the drinking water hygiene standards. For commonly used UPVC branch pipes, the maximum tolerable concentration is 50 mg / L (calculated as available chlorine), and this value comes from the chemical corrosion resistance data sheet provided by the pipe material supplier.

[0059] Following the above method, traverse each branch pipeline and determine the target injection concentration for each branch pipeline in turn.

[0060] This invention dynamically determines the concentration compensation step size for each branch pipeline and gradually accumulates it to approach the target injection concentration required for each branch. This avoids insufficient or excessive compensation caused by a uniform step size, ensuring that the target injection concentration of each branch pipeline is precisely matched to its length and biofilm consumption characteristics. This guarantees that the inner wall of the end of all branch pipelines can achieve the expected disinfection effect, breaking the disinfection blind spot.

[0061] S4. Use the maximum value of the target injection concentration in all branches as the host injection concentration for disinfectant injection.

[0062] It should be noted that the shared drinking water equipment includes a disinfectant injection device, which is set with a minimum controllable concentration. This minimum controllable concentration can be directly read from the technical parameters of the disinfectant injection device. Once the target injection concentrations for all branch pipes are determined, the disinfectant injection concentration for the main unit is determined according to the following rules: If the maximum target injection concentration among all branch pipes is lower than the minimum controllable concentration of the disinfectant injection device, then the disinfectant injection concentration for the main unit is set to the minimum controllable concentration. Otherwise, the maximum target injection concentration among all branch pipes is used as the disinfectant injection concentration for the main unit.

[0063] After the disinfectant is injected, to ensure that the end of each branch pipeline reaches an effective sterilization concentration, a post-processing verification step must be performed: S41, Install a concentration sensor at the main unit outlet to detect the concentration of the returned disinfectant. After the disinfectant is injected, read the concentration value of the returned disinfectant through this sensor and compare it with the preset return concentration threshold.

[0064] In this embodiment of the invention, considering that the concentration of disinfectant will experience two decays during the process of flowing from the main unit outlet through the branch pipe to the end and then back to the main unit outlet, and the total decay rate is usually not less than 50%, the preferred setting is 1.5 times the lowest effective concentration at the end, so as to ensure that even if there is a certain decay, if the return concentration is lower than this threshold, it indicates that the effective concentration at the end of at least one branch is not up to standard.

[0065] S42. If the concentration of the returned disinfectant is lower than the preset return concentration threshold, it is determined that the end concentration of one or more branch pipelines is insufficient. At this time, the following sub-steps are executed: S421. Select the branch pipeline with the highest target injection concentration from all branch pipelines, close the valves of other branch pipelines, keep the valve of the selected branch pipeline in the open state, so that the disinfectant injected by the host only circulates in the selected branch pipeline.

[0066] S422. Use the final concentration of the main unit used for this disinfection as the injection concentration of this branch pipeline, perform separate circulation flushing on this branch pipeline, and re-detect the concentration of the returned disinfectant through the concentration sensor at the outlet of the main unit.

[0067] S423. If the retested concentration of the reflux disinfectant is still lower than the reflux concentration threshold, then select the next untreated branch pipeline in descending order of the target injection concentration until the reflux disinfectant concentration is not lower than the reflux concentration threshold or all substandard branches have been treated.

[0068] It should be noted that if all branch pipes identified as potentially having insufficient concentration have been treated, and the retested concentration of the returned disinfectant is still below the return concentration threshold, an unknown fault is identified, a fault warning signal is generated, and subsequent water intake services are stopped, pending manual maintenance.

[0069] It should be noted that prioritizing high-risk branch pipelines can quickly locate and resolve issues of substandard terminal concentrations, thereby improving calibration efficiency.

[0070] It should also be noted that the shared drinking water equipment involved in this invention is pre-configured with a disinfectant circulation loop. Specifically, in addition to the main unit, disinfectant injection device, several branch pipes and their respective water dispensing terminals, the equipment also includes a return main pipe. The end of each branch pipe (i.e., before the water dispensing terminal) is connected to the return main pipe via a three-way valve or an independent return branch. The outlet of the return main pipe is connected to the inlet of the main unit or the disinfectant storage tank. When performing the circulation flushing in the post-treatment verification step, the outlet valves of all water dispensing terminals are closed, and the three-way valves are switched or the return branch is opened. This allows the disinfectant injected by the main unit to flow through the selected branch pipe and no longer exit from the water dispensing terminal, but instead return to the main unit inlet via the return main pipe, thus forming a closed circulation path. This circulation loop design ensures that the disinfectant can flow repeatedly within a single branch pipe, so that the effective concentration at the end of the pipe can be verified by detecting the return concentration.

[0071] The above content is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, and all such modifications and additions should fall within the protection scope of the present invention.

Claims

1. A disinfection control method for shared direct drinking water equipment based on the Internet of Things, characterized in that, The method includes: Obtain the length, diameter, current idle time, and cumulative water flow of each branch pipe corresponding to the shared direct drinking water equipment; Using the maximum length, maximum current idle time, minimum pipe diameter, and maximum cumulative outflow rate of all branch pipes as reference benchmarks, the length, pipe diameter, idle time, and cumulative outflow rate of each branch pipe are normalized relative to the reference benchmarks and then fused together to obtain the relative biofilm consumption index of each branch pipe. For each branch pipeline, the initial injection concentration is the minimum effective concentration at the end required for sterilization. The concentration compensation step size is dynamically determined according to the length of the branch pipeline and the relative biofilm consumption index. The injection concentration is gradually increased according to the step size. The effective concentration at the end is calculated after each increase until the effective concentration at the end is not lower than the minimum effective concentration at the end for the first time. The cumulative injection concentration is taken as the target injection concentration. The maximum value of the target injection concentration in all branches is used as the host injection concentration for disinfectant injection.

2. The disinfection control method for shared direct drinking water equipment based on the Internet of Things as described in claim 1, characterized in that: The current idle time is the length of time between the end of the last water intake event at the water intake terminal at the end of the branch pipeline and the start of the current disinfection.

3. The disinfection control method for shared direct drinking water equipment based on the Internet of Things as described in claim 1, characterized in that: The method for obtaining the cumulative outflow rate is as follows: obtain flow data from the flow meter installed at the outlet of each branch pipe, accumulate the total amount of water flowing out of the branch pipe from the time when the last disinfection was completed to the time when the current disinfection started, and record the accumulated value as the cumulative outflow rate.

4. The disinfection control method for shared direct drinking water equipment based on the Internet of Things as described in claim 1, characterized in that: The specific calculation steps for the relative biofilm consumption index of each branch pipeline are as follows: For each branch pipe, calculate the ratio of the length of the branch pipe to the maximum length of all branch pipes, and the ratio of the minimum diameter of all branch pipes to the diameter of the branch pipe. Multiply the two ratios to obtain the geometric attenuation influence coefficient. Calculate the ratio of the current idle time of this branch pipeline to the maximum current idle time of all branch pipelines to obtain the idle ratio. At the same time, calculate the ratio of the cumulative outflow of this branch pipeline to the maximum cumulative outflow of all branch pipelines to obtain the flow ratio. Subtract the flow ratio from 1 to obtain the outflow ratio. Multiply the idle ratio by the effluent ratio to obtain the biofilm interference factor, and use the sum of 1 and the biofilm interference factor as the interference correction factor. The relative biofilm consumption index is obtained by multiplying the geometrical attenuation influence coefficient and the interference correction factor.

5. The disinfection control method for shared direct drinking water equipment based on the Internet of Things as described in claim 4, characterized in that: When calculating the idle ratio, perform the following correction steps: Get the historical maximum idle time for the branch pipeline; If the current idle time is 0, no correction will be performed; If the current idle time is greater than 0 and the historical maximum idle time is greater than the current idle time, calculate the correction factor. , , This represents the longest period of idle time in history. Current idle time, This is the preset maximum correction factor; Multiply the idle ratio by the correction factor to obtain the corrected idle ratio, and use it as the final idle ratio. If the corrected idle ratio is greater than 1, then set the final idle ratio to 1.

6. The disinfection control method for shared direct drinking water equipment based on the Internet of Things as described in claim 1, characterized in that: The specific process for determining the concentration compensation step size includes: The length ratio is obtained by comparing the length of the currently processed branch pipe with the maximum length of all branch pipes. At the same time, the consumption ratio is obtained by comparing the relative biofilm consumption index of the currently processed branch pipe with the maximum relative biofilm consumption index of all branch pipes. Multiply the product of the length ratio and the consumption ratio by the minimum effective concentration at the end required for sterilization to obtain the concentration compensation step size for the branch pipeline currently being processed.

7. The disinfection control method for shared direct drinking water equipment based on the Internet of Things as described in claim 1, characterized in that: The specific calculation process for the effective terminal concentration includes: Obtain the current cumulative injection concentration, length, diameter, and relative biofilm consumption index of the currently being processed branch pipeline, and record them as follows: , , as well as ; Calculate the effective concentration at the end , , This is the preset empirical attenuation coefficient.

8. The disinfection control method for shared direct drinking water equipment based on the Internet of Things as described in claim 7, characterized in that: If the current injection concentration has reached the maximum tolerance concentration allowed by the branch pipe material, and the calculated effective concentration at the end is still lower than the minimum effective concentration at the end required for sterilization, then the increase will stop, and the maximum tolerance concentration will be used as the target injection concentration for the branch pipe. At the same time, an alarm message indicating that the disinfection of the branch pipe is not up to standard will be generated.

9. The disinfection control method for shared direct drinking water equipment based on the Internet of Things as described in claim 1, characterized in that: The shared drinking water equipment includes a disinfectant injection device, which is set with a minimum controllable concentration; When the maximum value of the target injection concentration among all branch pipelines is lower than the minimum controllable concentration, the disinfectant injection concentration of the main unit is set to the minimum controllable concentration; otherwise, the maximum value of the target injection concentration among all branch pipelines is used as the disinfectant injection concentration of the main unit.

10. The disinfection control method for shared direct drinking water equipment based on the Internet of Things as described in claim 1, characterized in that: After the disinfectant is injected, the following steps are also included: After the disinfectant is injected, the concentration of the returned disinfectant is detected by a concentration sensor installed at the outlet of the main unit. If the concentration of the returned disinfectant is lower than the preset return concentration threshold, it is determined that there is insufficient concentration at the end of the branch pipeline, and the following sub-steps are executed: Select the branch pipeline with the highest target injection concentration from all branch pipelines, close the valves of the other branch pipelines, and keep the valve of the selected branch pipeline in the open state; The final concentration of the main unit used in this disinfection is taken as the concentration of the branch pipeline. The branch pipeline is then individually circulated and flushed, and the concentration of the reflux disinfectant is retested. If the retested concentration of the reflux disinfectant is still lower than the reflux concentration threshold, then select the next untreated branch pipeline in descending order of the target injection concentration, until the reflux disinfectant concentration is not lower than the reflux concentration threshold or all non-compliant branches have been treated.

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