Waterway disinfection method, water treatment system, water treatment equipment and storage medium

Abstract

The invention relates to the technical field of water treatment, and provides a waterway disinfection method, a water treatment system, water treatment equipment and a storage medium, the method comprises the following steps: firstly, responding to a starting signal to control a water body UV sterilization device to irradiate water flow; when a preset heating triggering condition is met, a heating device is controlled to heat the water body to a sterilization target temperature based on the real-time water temperature, and a circulating pump set is controlled to enable hot water to circulate in the whole pipeline; when the heating quit condition is met, the heating device is closed, and the drainage valve set is opened to empty the pipeline; and finally, stopping the circulating pump group and closing the drainage valve group. The method realizes ultraviolet and thermal collaborative disinfection, can intelligently trigger deep disinfection and automatically empty the pipeline according to the system state, and has the advantages of thorough disinfection, energy saving, high efficiency and no chemical residue.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment, in particular to a water channel disinfection method, a water treatment system, a water treatment device and a storage medium. BACKGROUND

[0002] Disinfection of water channel system is a key link to ensure the safety of water supply, especially in direct drinking water system, medical water supply pipeline and food and beverage processing pipeline. At present, the common water channel disinfection methods in the industry mainly include ultraviolet disinfection and chemical disinfection.

[0003] Ultraviolet disinfection technology irradiates the flowing water body with ultraviolet light of a specific wavelength to destroy the genetic material of microorganisms, thereby achieving instant sterilization. Although this method has the advantages of no chemical addition and no change in water quality composition, its disinfection efficiency is highly dependent on stable water flow rate and sufficient irradiation dose, and the killing effect on some microorganisms with strong ultraviolet resistance or bacteria hidden in the pipeline biofilm is limited. In addition, this technology does not have sustained bacteriostatic ability, and the disinfection effect stops with the end of irradiation.

[0004] Chemical disinfection is achieved by adding chlorine preparations, hydrogen peroxide and other disinfectants to the water system. Although this method can treat the inner wall of the pipeline and has certain residual disinfection effect, it inevitably introduces chemical substances, which may cause residual odor, form harmful byproducts, corrode pipeline materials, and require subsequent treatment or discharge, and the operation and management are relatively complex.

[0005] Whether it is ultraviolet disinfection alone or chemical disinfection, there are limitations. Current water channel disinfection practices often rely on a single mode of regular and fixed procedures, and it is difficult to achieve a good balance between disinfection thoroughness, operating efficiency and operational convenience. Therefore, the industry expects a more intelligent, efficient and chemical residue-free comprehensive water channel disinfection solution. SUMMARY

[0006] The present application provides a water channel disinfection method, a water treatment system, a water treatment device and a storage medium, which can solve the technical problems of single disinfection method, limited effect and possible secondary pollution in the prior art.

[0007] In a first aspect, a water channel disinfection method is provided, applied to a water treatment system, the water treatment system comprising: a control device, a circulating pump group, a water body UV sterilization device, a temperature sensor, a water body heating device, and a drain valve group; the control device is electrically connected with the circulating pump group, the water body UV sterilization device, the temperature sensor, the water body heating device and the drain valve group, respectively. The water channel disinfection method comprises: in response to a system start-up signal, controlling the water body UV sterilization device to irradiate the water flowing through the water path; when it is detected that the preset heating trigger condition is met, based on the real-time water temperature measured by the temperature sensor, controlling the water body heating device to heat the water in the water path to a preset sterilization target temperature, and controlling the circulating pump group to circulate the heated water in all water path pipelines; when it is detected that the preset heating exit condition is met, turning off the water body heating device, and opening the drain valve group to empty the water in the pipeline; after the water in the pipeline is emptied, controlling the circulating pump group to stop working and closing the drain valve group.

[0008] In a second aspect, a water treatment system is provided, comprising: a control device, a circulating pump group, a water body UV sterilization device, a temperature sensor, a water body heating device, and a drain valve group; the control device is electrically connected with the circulating pump group, the water body UV sterilization device, the temperature sensor, the water body heating device, and the drain valve group, respectively. The control device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor is used to execute the steps of the water path disinfection method.

[0009] In a third aspect, a water treatment device is provided, and the above-mentioned water treatment system.

[0010] In a fourth aspect, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program, and the computer program is executed by a processor to realize the steps of the above-mentioned water path disinfection method.

[0011] The beneficial effects of the present application are: Ultraviolet instant disinfection and thermal deep disinfection are combined in a single path in time. During normal operation, the water body UV sterilization device is relied on for continuous and low-energy microbial inhibition; when the system intelligently determines that deep cleaning is needed, the heating and circulating program is automatically started. This synergistic mechanism overcomes the shortcomings of single ultraviolet disinfection in killing biofilm and resistant microorganisms, and avoids the residual and corrosion problems of single chemical disinfection, providing more thorough and safer physical disinfection protection.

[0012] Through the control device, the high-energy heating disinfection program is intelligently started based on the preset heating trigger condition. This makes deep disinfection only necessary, thereby greatly reducing the energy waste that may be caused by fixed period disinfection, and achieving the balance between on-demand disinfection and energy-saving operation.

[0013] After the completion of the heating disinfection, the automatic opening of the drain valve group to empty the high-temperature water in the pipeline, and finally closing all related equipment. Solve the risk of secondary microbial breeding in the pipeline after the cooling of the residual water body, also avoid the dilution of the residual water to the newly injected clean water, ensure that the entire water system is in a dry and clean standby state after the disinfection cycle is completed.

[0014] The entire disinfection process, from UV irradiation, condition judgment, heating cycle to emptying and resetting, is automatically controlled by the control device to form a closed-loop management. This minimizes the errors that may be caused by manual intervention, and prevents the equipment from overheating or overrunning through the preset heating exit conditions, improving the automation level and operation reliability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0016] Figure 1 The structure schematic diagram of the first embodiment of the water treatment system provided by the embodiments of the present application is provided. Figure 2 The structure schematic diagram of the second embodiment of the water treatment system provided by the embodiments of the present application is provided. Figure 3 The structure schematic diagram of the third embodiment of the water treatment system provided by the embodiments of the present application is provided. Figure 4 The flowchart of the water pipeline disinfection method provided by the embodiments of the present application is provided. Figure 5 The structure block diagram of the control device provided by the embodiments of the present application is provided. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0018] The exemplary embodiments will be described in detail below with reference to the attached drawings. The following description is made with reference to the accompanying drawings, in which like reference numerals refer to like elements, and wherein the illustrated embodiment is merely an example of how the exemplary embodiments can be made and practiced and is not intended to restrict the scope of the present application. The following exemplary embodiments described are not meant to represent all implementations consistent with the present application. Rather, they are simply examples of apparatus and methods consistent with some aspects of the present application as detailed in the appended claims.

[0019] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. It is also possible in the present application that a plurality of structural components, features, elements, or steps are combined into a single structural component, feature, element or step. Conversely, it is possible in the present application that a single structural component, feature, element or step is divided into multiple structural components, features, elements or steps. Such alterations and modifications to the embodiments described herein are well within the scope and spirit of the present application. It is therefore intended that the present application not be limited to the disclosed embodiments, but that the present application include all modifications and alternatives within the scope and spirit of the present application.

[0020] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. It is also possible in the present application that a plurality of structural components, features, elements, or steps are combined into a single structural component, feature, element or step. Conversely, it is possible in the present application that a single structural component, feature, element or step is divided into multiple structural components, features, elements or steps. Such alterations and modifications to the embodiments described herein are well within the scope and spirit of the present application. It is therefore intended that the present application not be limited to the disclosed embodiments, but that the present application include all modifications and alternatives within the scope and spirit of the present application.

[0021] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. It is also possible in the present application that a plurality of structural components, features, elements, or steps are combined into a single structural component, feature, element or step. Conversely, it is possible in the present application that a single structural component, feature, element or step is divided into multiple structural components, features, elements or steps. Such alterations and modifications to the embodiments described herein are well within the scope and spirit of the present application. It is therefore intended that the present application not be limited to the disclosed embodiments, but that the present application include all modifications and alternatives within the scope and spirit of the present application.

[0022] Reference will now be made to Figure 1 , Figure 1 is a structural schematic diagram of a first embodiment of a water treatment system provided by the present application. The water treatment system provided by the present application can specifically include: the water treatment system includes: the control device (not shown in the figure), the circulating pump group 1, the water UV sterilization device 3, the temperature sensor 4, the water heating device 2, and the drain valve group 5; the control device is electrically connected with the circulating pump group 1, the water UV sterilization device 3, the temperature sensor 4, the water heating device 2, and the drain valve group 5, respectively. Figure 1

[0023] ​The water inlet of the circulating pump set 1 is communicated with the water outlet of the water tank, which can be an internal water tank or an external water tank. The water outlet of the circulating pump set 1 is communicated with the water inlet of the water body heating device 2. The water outlet of the water body heating device 2 is communicated with the water inlet of the water body UV (Ultraviolet) sterilization device 3. The water outlet of the water body heating device 2 is communicated with the water inlet of the water body UV sterilization device 3. The drain valve set 5 is arranged at the lowest point of the system water circuit or a suitable branch. The water inlet of the drain valve set 5 is communicated with the pipeline, and the water outlet is connected to the external drain pipe. The temperature sensor 4 is arranged in the pipeline between the water body heating device 2 and the UV water body sterilization. The water outlet of the water body UV sterilization device 3 is communicated with the water inlet of the circulating pump set 1 to form a water circuit connected at the head and tail.

[0024] It should be noted that, Figure 1 The structure diagram of the reclaimed water treatment system is only an example for reference. The positions of various components can be adjusted according to actual needs during specific implementation.

[0025] The control device is responsible for the overall automatic control and logic management of the system, including receiving sensor signals, processing data, and sending control signals to each execution component according to the preset program or user instructions to realize intelligent control of the water circulation, sterilization, heating, and drainage processes.

[0026] The control device can adopt PLC (Programmable Logic Controller), MCU (Microcontroller Unit), or industrial computer, and be configured with corresponding input / output modules, human-computer interaction interface (such as touch screen), and control software. It is connected with each external component through digital or analog interface.

[0027] The circulating pump set 1 provides the power for the water body to circulate in the system, ensuring that the water can flow through each processing unit (such as the water body UV sterilization device and the water body heating device) to achieve uniform treatment and heat exchange.

[0028] The circulating pump set 1 can adopt one or more centrifugal pumps connected in parallel to form a pump set, and can be equipped with a frequency converter to realize flow regulation. The water inlet end is connected to the water source or the return water pipeline, and the water outlet end is connected to the subsequent processing unit (such as the water body UV sterilization device 3 or the water body heating device 2).

[0029] The water body UV sterilization device 3 uses specific wavelength ultraviolet light to irradiate the water flowing through it, destroying the genetic material of bacteria, viruses, and other microorganisms in the water, achieving the purpose of disinfection and sterilization without adding chemical agents.

[0030] The water body UV sterilization device 3 mainly includes a sealed cavity, at least one UV lamp, a quartz sleeve, and a driving control unit. The sealed cavity is a closed pressure-bearing container, which is respectively provided with a water inlet and a water outlet at two ends, and is used for connecting a water system so that the water body to be treated can flow through the inside. The at least one UV lamp is installed in the sealed cavity as an ultraviolet light source. The quartz sleeve is a transparent tubular protective cover made of high-purity quartz glass, which tightly encapsulates the UV lamp, and its function is to allow the ultraviolet light to efficiently pass through while completely isolating the UV lamp from the water flow, thereby ensuring electrical safety and preventing the lamp from being affected by water temperature fluctuations and pollution. The driving control unit usually includes a ballast, a power module, and necessary control circuits, which are electrically connected with the UV lamp, responsible for providing a starting voltage for the UV lamp and maintaining its stable operation. In addition, the driving control unit is electrically connected with the control device and can receive instructions from the control device to turn on or off the UV lamp, or adjust its output power.

[0031] The temperature sensor 4 is used to monitor the temperature of the water body in real time and convert the temperature signal into an electrical signal to be transmitted to the control device, providing feedback for heating control.

[0032] The temperature sensor usually adopts a platinum resistance (such as PT100 graduation) or a thermocouple temperature probe, which is installed in the pipeline or water tank through which the water body flows. Its signal line is connected to the analog input module of the control device.

[0033] The water body heating device 2 is used to quickly and controllably heat the water flowing through its inside, so that it can reach and maintain the preset sterilization target temperature, thereby achieving effective thermal disinfection.

[0034] The water body heating device 2 is provided with a water inlet and a water outlet for connecting in series to the water circulation system, so that the water to be treated can flow into and out of the device body. The core of the device is a heating element, which can be an immersed electric heating tube, a plate heat exchanger, or a shell-and-tube heat exchanger. If an electric heating tube is used, it is usually directly encapsulated in a corrosion-resistant metal sleeve and extends into the water flow channel; if a heat exchanger is used, the water body is indirectly heated by the flow of a heat medium (such as steam or high-temperature hot water) on the other side. The device is designed with a reasonable water flow channel to ensure that the water body is in full contact with the heating element or heat exchange surface.

[0035] The drain valve group 5 is used to open or close the drain passage under the control of the control device, for system drainage, water replacement, or emptying maintenance.

[0036] The drain valve group 5 can be composed of one or more solenoid valves or electric ball valves, which are installed on the drain branch of the system pipeline. The control device controls its on-off through output switching signals.

[0037] Referring to Figure 2As shown in the structural schematic diagram of the second embodiment of the water treatment system provided by the present application.

[0038] On the basis of the above, Figure 1 The water treatment system further comprises a flowmeter 6, which is arranged in the water channel and electrically connected to the control device.

[0039] The function of the flowmeter 6 is to monitor the flow rate of the water in the water channel in real time and convert the physical quantity into a standard electrical signal transmitted to the control device, providing a key flow parameter for dynamic control of the system.

[0040] The flowmeter 6 mainly comprises a sensor body and a signal output unit. The sensor body contains mechanical or electronic sensing components that sense the flow rate of water, such as turbine and bearing assemblies, ultrasonic transducer pairs, or target flow rods. The body is provided with standard pipe interfaces at both ends or sides for series or plug-in installation in the water channel pipe, so that the water flow can flow through the sensing area. The signal output unit is integrated with or connected to the sensor body. The internal circuit of the signal output unit processes the mechanical rotation, frequency difference or deformation displacement signals generated by the sensing components and converts them into standard signals recognizable by the control device, such as voltage and current analog signals or pulse frequency digital signals, and establishes an electrical connection with the control device of the system through a cable.

[0041] Referring to Figure 3 As shown in the structural schematic diagram of the third embodiment of the water treatment system provided by the present application.

[0042] On the basis of the above, Figure 2 The water treatment system further comprises an ice bin UV sterilization device 7 and an ice bin 8. The ice bin UV sterilization device 7 comprises n UV lamps 72 and a driving control unit 71, the driving control unit 71 is electrically connected to the control device and the n UV lamps 72 respectively, and the n UV lamps 72 are arranged at different positions in the ice bin. n is an integer greater than 1.

[0043] The function of the ice bin UV sterilization device 7 is to sterilize the internal cavity and all internal surfaces by high-intensity ultraviolet irradiation when the ice bin 8 is empty and in a closed state. This ensures that the ice made from the purified water prepared by the water treatment system has a highly sanitary final storage environment, killing bacteria, mold and other microorganisms that may be attached to the bin wall or suspended in the air, thereby preventing secondary pollution of the ice during storage and ensuring the cleanliness and safety of the end product.

[0044] The ice bin UV sterilization device 7 mainly includes a drive control unit 71 and n UV lamps 72. The drive control unit 71 is an independent electrical control module, which internally integrates a ballast, a power control circuit and a communication interface. The unit is electrically connected to the main control device of the system through a communication cable, and receives start-stop and power adjustment instructions from the main control device. The n UV lamps 72 serve as ultraviolet light sources, and the number n is an integer greater than 1. Each UV lamp is connected to the drive control unit 71 through low-temperature-resistant wires. These UV lamps 72 are strategically installed and fixed at different geometric positions inside the ice bin 8, such as the top, the side walls and the back wall, forming a cross-illumination network through multi-angle layout to achieve full-coverage sterilization of the interior space of the ice bin.

[0045] The ice bin 8 is used to receive and store ice bodies made of pure water prepared by the water treatment system. It serves as the terminal storage unit of the entire water treatment system, not only providing a heat-insulated, sealed physical storage space for ice bodies to slow down melting, but more importantly, providing a continuous, sterile sanitary storage environment for the processed pure water ice bodies, thereby completing the entire process closed loop from water source purification to terminal product safe storage.

[0046] The structure of the ice bin 8 is designed to achieve the above-mentioned storage and health protection functions. It is a sealed container with excellent thermal insulation performance, mainly composed of a bin body, a bin door, a thermal insulation layer and a special interface. The inner wall of the bin body is made of smooth, corrosion-resistant and easy-to-clean material, and has a sealed interface for mounting and fixing n UV lamps 72. The bin door is equipped with a sealing strip and a door state detection switch to ensure airtightness and state feedback. The thermal insulation layer is filled between the inner and outer shells of the bin body, usually using polyurethane foam material to effectively insulate heat transfer. In addition, the ice bin 8 is provided with a special channel connected to the ice outlet of the ice maker for receiving ice bodies made of pure water, and can also be provided with a drain for draining possible ice melting water.

[0047] Based on this, referring to Figure 4 a flowchart of a water path disinfection method provided by the present application is shown, which specifically includes the following steps: S1, in response to a system startup signal, controlling the water body UV sterilization device to irradiate the water flowing through the water path.

[0048] The control device receives a system start-up signal, which is an initial electrical control instruction to start the entire water treatment process. The start-up signal can come from various physical or logical trigger sources, such as a level change signal generated by a user operating a hardware button, an internal instruction sent by a touch screen interface software, a timing signal generated by a system preset timer reaching a set time, or a remote control signal sent by an upper computer through a communication interface. After receiving the signal, the control device immediately executes the pre-set logic program, the core operation of which is to issue a start command to the driving circuit of the water body UV sterilization device. The essence of the start command is that the control device closes the electrical control switch element connected to it, thereby connecting the working power supply for the water body UV sterilization device. The water body UV sterilization device usually includes an ultraviolet lamp and a ballast or power supply module that provides stable operation for it. After being powered on, the ultraviolet lamp is lit and emits ultraviolet light of a specific wavelength. To achieve the flow of water through the sterilization area, a power source is needed in the water system to drive the water flow. This power source is usually a pump set, such as a water supply pump set or a water delivery pump set that is responsible for transporting the water source to the treatment system. The control device can control the pump set to start synchronously, or make the operation of the pump set one of the necessary conditions for the start of the water body UV sterilization device, to ensure that water flows through the irradiation cavity of the ultraviolet lamp when it is lit, so that the water receives sufficient irradiation of ultraviolet light during the flow, thereby destroying the genetic material of microorganisms in the water and achieving the purpose of sterilization and disinfection. The control device can set the water body UV sterilization device to run continuously during system operation, or control its start and stop based on other parameters such as cumulative running time.

[0049] For example, the user presses the green start button on the control cabinet on site. After the button is pressed, a high-level signal is transmitted to the dedicated digital input port of the control device. The processor in the control device detects the level change of the port and confirms it as a valid start-up signal. Subsequently, the processor controls an intermediate relay to be attracted through its digital output port. The contacts of the intermediate relay are connected in series in the power supply circuit of the water body UV sterilization device, and after the contacts are closed, 220-volt alternating current is sent to the electronic ballast in the device, which drives the ultraviolet lamp to complete lighting within 1 to 2 seconds. At the same time as issuing the lighting instruction, the control device starts the main water delivery pump set of the system through another output signal. The water delivery pump set operates to pump the water to be treated into the sealed cavity where the ultraviolet lamp is located and flows through it. The status indicator light on the operation panel turns green and displays the ultraviolet icon, indicating that step S1 is being executed.

[0050] S2, when the preset heating trigger condition is met, based on the real-time water temperature measured by the temperature sensor, controlling the water body heating device to heat the water in the waterway to the preset sterilization target temperature, and controlling the circulating pump set to circulate the heated water in all waterway pipes.

[0051] The control device continuously monitors the electrical signal from the temperature sensor, which corresponds to the real-time water temperature of the water body in the water circuit during the execution of the process. The control device has a heating trigger condition as a judgment reference preset inside, which usually means that the real-time water temperature is lower than a set sterilization target temperature threshold. The control device cyclically compares the real-time temperature value collected with the threshold. When the comparison result confirms that the real-time water temperature has reached the heating trigger condition, the control device immediately enters the heating control stage. In this stage, the control device first issues a start instruction to the power control unit of the water body heating device. The water body heating device starts working, and the heat energy generated by it is transferred to the water flowing through. At the same time, the control device starts or ensures that the circulating pump set is in operation. The circulating pump set drives the water body to continuously flow in the entire closed water circuit pipeline network including the water body heating device. Based on the real-time water temperature data fed back by the temperature sensor, the control device adopts closed-loop control logic to dynamically adjust the output power of the water body heating device. For example, when the real-time water temperature is far from the sterilization target temperature, the control device instructs the water body heating device to work at a high power; when the water temperature approaches the target temperature, the heating power is reduced to prevent temperature overshoot, and finally the water temperature reaches and stabilizes at the preset sterilization target temperature. During the entire heating and constant temperature process, the circulating pump set continuously works to ensure that the heated water can be fully circulated to all pipelines of the system, realizing uniform heat disinfection effect.

[0052] The determination of the target sterilization temperature is mainly based on the scientific data of heat inactivation of specific pathogenic microorganisms in the target water body, and the safety margin and system working condition in engineering application are considered; specifically, first, according to the published industry standards, technical specifications or experimental data, select the basic temperature and time combination required to achieve effective inactivation of target microorganisms (such as Legionella, Escherichia coli, etc.), then on this basis, further consider the possible unevenness of heat distribution in the actual water treatment system, pipeline heat loss, equipment material temperature limit and control precision, etc., add a reasonable safety margin, and finally through the comprehensive trade-off of sterilization efficiency, system safety and operation energy consumption, determine a clear and stable controlled temperature value as the preset sterilization target temperature.

[0053] For example, the control device is preset with a sterilization target temperature of 85 degrees Celsius, and a heating trigger condition of water temperature below 80 degrees Celsius. The temperature sensor continuously transmits the measured water temperature data, such as 75 degrees Celsius, to the control device. The control device determines that 75 degrees Celsius is below the trigger threshold of 80 degrees Celsius, and the condition is met. Subsequently, the control device outputs a control signal to the solid-state relay of the electric heating pipe, causing it to turn on and start heating. At the same time, the control device sends a start command to the frequency converter of the circulating pump group, causing the circulating pump to operate at a frequency of 50 Hz. The control device adjusts the heating power using a proportional-integral control algorithm based on the data reported by the temperature sensor every minute. When the water temperature rises to 84 degrees Celsius, the control device reduces the heating power to 60% of the rated value; when the water temperature reaches and stabilizes at 85 degrees Celsius, the control device adjusts the heating power to a maintenance power that just compensates for the system heat loss. Throughout this process, the circulating pump is always running, pushing the 85 degrees Celsius hot water to circulate in all pipes of the system.

[0054] S3, when it is detected that the preset heating exit condition is met, the water heating device is turned off, and the drain valve group is opened to empty the water in the pipeline.

[0055] In this process, the control device continuously or periodically determines whether the preset heating exit condition is met. This condition is a set of one or more logical judgments, and its typical form is that the system water temperature reaches and maintains the preset sterilization target temperature, and this state lasts for a preset holding sterilization time. The holding sterilization time is based on the principle of thermal disinfection, and is the shortest duration required to achieve the desired sterilization effect. Its value is preset in the control device together with the sterilization target temperature. In addition, the heating exit condition can also include active stop commands from the user or system monitored fault signals and other logical conditions. When the control device confirms that the current state meets any valid exit condition, it performs two main operations in sequence. First, the control device sends a shutdown command to the power control unit of the water heating device, cutting off its energy supply and stopping the heating process immediately. Then, the control device sends an opening command to the drain valve group. The drain valve group is usually composed of one or more solenoid valves or electric valves, and is installed at the lowest point of the water system or at the end of each branch. After the valve is opened, the system waterway is connected to the external atmosphere or drain pipeline, and the high-temperature water in the pipeline begins to drain under the action of its own gravity or residual pressure in the system. To ensure the emptying effect, the control device can start the circulating pump group for a short time to disturb the water flow and assist drainage, or rely on a preset long enough drainage time to complete the emptying process.

[0056] For example, the preset heating exit condition in the control device is that the water temperature reaches 85 degrees Celsius and continues to circulate for 20 minutes. When the temperature sensor feeds back that the water temperature has stabilized at 85 degrees Celsius and the internal timer of the control device confirms that this constant temperature cycle has been full for 20 minutes, the condition is met. The control device immediately cuts off the power supply of the electric heating tube, and the heating stops. Then, the control device sends a full opening signal to the electric ball valve at the end of the main pipe, and the drain passage is opened. At the same time, the control device can command the circulating pump to run at a low frequency for 5 seconds to push the water in the pipe out. After the drain valve remains open for 30 seconds, the control device determines that the water body has been basically drained, and then sends a command to close the drain valve and stop the circulating pump, and the whole heat sterilization and emptying process is completed. The system status indicator light switches to standby.

[0057] In one possible embodiment, the preset heating trigger condition includes at least one of the following: reaching a preset periodic disinfection time point; cumulative water production or water taking amount reaching a preset threshold; receiving a forced disinfection instruction triggered by the user through the interface; UV water sterilization device continuous working time reaching a first preset length of time.

[0058] The preset heating trigger condition in this embodiment is responsible for monitoring and judging by the control device. These conditions are logically "or", and any condition met can trigger the subsequent heating disinfection program.

[0059] First, reaching a preset periodic disinfection time point.

[0060] The control device is internally configured with a clock module or synchronized with an external time server, and has a timing and calendar function. In the program or parameter storage area of the control device, one or more periodic disinfection time points are preset, such as a certain fixed time every day, a certain day and time every week. During the running process of the control device, the current real time is continuously compared with the preset multiple time points in a loop. When the real time matches one of the preset time points, it is determined that the heating trigger condition is met, and an internal trigger signal is generated to start the subsequent heating and circulation process.

[0061] For example, in the parameter setting menu of the control device, the periodic disinfection time point is set to 2 o'clock every day. The internal real-time clock chip of the control device provides the current date and time information. Every day when the clock information becomes 02:00:00, the software program of the control device recognizes that the time is completely consistent with the preset time point. At this time, the control device immediately sets an internal flag bit as a confirmation signal of meeting the "reaching a preset periodic disinfection time point" condition, and triggers the heating program of step S2.

[0062] Second, the cumulative water production or consumption reaches a preset threshold.

[0063] A flow monitoring device is installed in the system, such as a flow sensor on the water inlet main pipe or the water consumption point pipe. The flow sensor converts the volume signal of water flow into a pulse signal or a digital signal and sends it to the control device. The control device has an accumulator inside for continuously accumulating the flow signal, so as to obtain the cumulative water production or consumption since the last reset. The cumulative value is stored in a non-volatile memory to prevent loss due to power failure. The control device compares the real-time cumulative value with a preset water volume threshold in a loop. When it is detected that the cumulative value reaches or exceeds the preset threshold, it is determined that the heating trigger condition is met. The preset threshold is mainly based on the total volume of the water system, the average daily water consumption, and the water quality pollution risk model. By setting the threshold value as several times the system capacity or the water volume corresponding to the safe water consumption period based on historical data statistics, it is ensured that deep disinfection is triggered before potential microbial breeding.

[0064] For example, the preset cumulative water production threshold is 10 tons. The control device receives the pulse signal from the turbine flow meter on the water inlet pipe, and every 1000 pulses represent 1 ton of water flow. The counter inside the control device accumulates the pulses. When the cumulative value reaches 10000 pulses, corresponding to 10 tons of water, the control device determines that the cumulative amount has reached the threshold. Then, the control device generates a trigger signal to start the heating disinfection program, and the cumulative value can be cleared to prepare for the next cycle count.

[0065] Third, a forced disinfection instruction triggered by the user through the interface is received.

[0066] The control device is connected to a human-machine interface, which provides physical buttons, touch screen virtual buttons or menu options for starting forced disinfection. When the user performs a specific operation through the interface, the interface will generate a specific electrical signal or data packet instruction corresponding to the regular start-up signal and transmit it to the core processing unit of the control device. The program of the control device is configured to specifically recognize this specific instruction. Once this instruction is received, it is directly determined that the heating trigger condition is met without waiting for other conditions.

[0067] For example, a separate "forced high-temperature disinfection" button is provided on the touch screen operation interface. After the user clicks the button, the touch screen controller sends a predefined instruction code, such as the hexadecimal number "AA55", to the main controller of the control device. When the main program of the control device analyzes the communication data, it recognizes the "AA55" code and confirms that the user has issued a forced disinfection instruction. The control device immediately interrupts any standby or low-priority tasks and immediately responds and executes the heating disinfection process of step S2.

[0068] Fourth, the UV sterilization device for water works continuously for the first preset duration.

[0069] The control device is equipped with a timer specifically designed to record the single or cumulative continuous operating time of the UV sterilization device in the water. The timer starts whenever the UV sterilization device is activated and pauses or stops when it is deactivated. The control device compares the timer's value with a pre-stored first preset duration. When the timer value reaches or exceeds this first preset duration, the heating trigger condition is considered met. This condition can be used to initiate deeper thermal sterilization as a supplement or maintenance after a certain level of UV sterilization has been achieved. The first preset duration is set based on the light source attenuation characteristics of the UV sterilization device, the effective cycle of continuous sterilization, and the interval requirements for supplementary thermal sterilization, referencing maintenance recommendations provided by the equipment manufacturer or experimentally verified UV irradiation efficiency degradation points. This cumulative operating time value balances continuous operating efficiency with the need for periodic thermal sterilization.

[0070] For example, the first preset duration is set to 100 hours. A storage unit inside the control device specifically records the operating time of the UV sterilization device. Starting from the device's most recent startup, the control device increments the value in this storage unit by 1 every hour. When the accumulated value reaches 100, the control device determines that the condition has been met. Subsequently, while starting the heating and sterilization program, the control device can clear the timer record to begin the next cycle.

[0071] In one embodiment, the preset heating termination condition includes at least one of the following: The continuous working time from the start of the water heating device reaches the second preset duration; The water temperature in the water system is monitored and maintained above the sterilization target temperature for a period of time up to the third preset time. The cumulative circulation time of the circulating pump unit has reached the fourth preset duration.

[0072] In this embodiment, the preset heating exit conditions are monitored and determined by the control device. These conditions are logically ORed; satisfying any one of them triggers the heating stop and system purging process.

[0073] First, the continuous working time from the start of the water heating device reaches the second preset duration.

[0074] The control device resets and starts a dedicated internal timer when it sends the start command to the water body heating device. The timer is used to accurately record the duration of the current continuous operation of the water body heating device. The control device continuously compares the value of the timer with the second preset time length. The second preset time length is the maximum allowed continuous heating time set according to the safe operation characteristics of the water body heating device, the system heat load, and the general sterilization requirements. Its purpose is to prevent the water body heating device from overheating or wasting energy due to long-time operation. Once the timer value reaches or exceeds the second preset time length, the control device determines that the exit condition is met, regardless of whether the water temperature has reached the sterilization target temperature. The second preset time length is mainly determined by the manufacturer's claimed maximum continuous operation life, system design heat load, and the principle of preventing energy waste, by setting a protective operation time that is less than the safety limit of the device.

[0075] For example, the second preset time length is set to 30 minutes. When the control device starts the electric heating tube, an internal timer starts counting from zero. During the heating process, the control device reads the timer value every second. When the timer value reaches 1800 seconds, i.e., 30 minutes, the control device immediately generates a signal that unconditionally triggers step S3 to execute the operation of closing the water body heating device and opening the drain valve group.

[0076] Second, the water temperature in the waterway is monitored to maintain above the sterilization target temperature for a third preset time length.

[0077] During the heating process, the control device continuously obtains the real-time water temperature in the waterway through the temperature sensor. The control device is provided with a state timer that is specifically used to record the duration of the state that the water temperature continuously meets the condition of "not lower than the sterilization target temperature". Specifically, when the control device determines that the real-time water temperature first reaches the sterilization target temperature, the state timer starts. In subsequent monitoring, if the water temperature occasionally fluctuates slightly but always remains above the sterilization target temperature, the counting continues. If the water temperature drops below the target temperature, the timer resets to zero and starts counting again when the water temperature rises above the target temperature. When the value of this state timer accumulates to the pre-set third preset time length, it is determined that the heating exit condition is met. The third preset time length is a key parameter based on the kinetics of thermal sterilization, ensuring that microorganisms are exposed to effective temperature for a sufficient time to achieve reliable sterilization effect. The core of the third preset time length is the kinetics of microbial inactivation in thermal disinfection, which needs to refer to the scientific data of the minimum exposure time required for the target pathogen to reach the specified kill rate (such as 99.99%) at the sterilization target temperature, and increase the time allowance due to the possible temperature difference between the system temperature monitoring point and the coldest point of the pipeline.

[0078] For example, the sterilization target temperature is 85 degrees Celsius, and the third preset time length is set to 20 minutes. When the temperature sensor first feeds back that the water temperature reaches 85 degrees Celsius, a dedicated holding timer in the control device starts counting from zero. In subsequent monitoring, even if the water temperature fluctuates between 85 degrees Celsius and 87 degrees Celsius, as long as it is not lower than 85 degrees Celsius, the counting continues. When the cumulative value of this timer reaches 20 minutes, the control device determines that the set heat sterilization holding time has been reached, the condition is met, and then performs the operation of exiting heating and draining.

[0079] Third, the cumulative circulation time of the circulating pump set reaches the fourth preset time length.

[0080] An internal cumulative timer is provided in the control device to record the total running time of the circulating pump set in this heating sterilization cycle. This timer starts counting when the circulating pump set starts, and whether the circulating pump set is in continuous operation or intermittent operation mode, the power-on running time will be recorded. The control device compares this cumulative value with the fourth preset time length set in advance. The fourth preset time length is the shortest total circulation time required to ensure that the heated water has enough time to circulate to every corner of the entire waterway system from the perspective of fluid dynamics and heat exchange uniformity. When the cumulative circulation time reaches the fourth preset time length, the control device determines that the system has achieved sufficient heat circulation and meets the heating exit condition. The fourth preset time length is based on the principles of fluid mechanics and heat transfer, and through calculation or testing, the shortest time required for the water in the entire pipe volume of the system to complete at least one complete replacement and sufficient heat exchange under the circulating pump set flow rate, which is usually a multiple of the ratio of the total volume of the system to the circulating flow rate, to ensure the uniformity of heat distribution.

[0081] For example, the fourth preset time length is set to 25 minutes. After the heating program starts, the circulating pump set starts running. A memory unit with power-off holding function in the control device accumulates the running time of the pump set. During the heating process, the circulating pump may be temporarily started and stopped due to control strategy, but the cumulative running time continues to increase. When the control device reads that the cumulative value has reached 25 minutes, it determines that the circulation has been sufficient, and then triggers the subsequent heating exit and drainage process.

[0082] It should be noted that the preset periodic disinfection time point, the preset threshold (cumulative water volume), the first to fourth preset time length and other parameters can be set and optimized by a person skilled in the art according to the actual pipeline volume of the water treatment system, the use frequency, the target water quality health standard (for example, referring to the Drinking Water Health Standard GB5749), the safety operation guide provided by the equipment manufacturer and the limited conventional debugging experiment. For example, the second preset time length (maximum continuous working time of the heating device) can be determined according to the maximum allowed continuous working temperature and time in the product specification of the selected heating element; the third preset time length (holding time) can be determined by referring to the thermal inactivation D value (heat-induced death time) of the target microorganism (for example, Legionella) at the sterilization target temperature multiplied by a safety factor (for example, 3-5 times).

[0083] S4, after the water in the pipeline is emptied, the control circulating pump group stops working and the drain valve group is closed.

[0084] The step is a finishing and resetting operation performed by the control device after the pipeline is drained. The control device needs to first determine whether the water in the pipeline has been emptied as expected. The determination basis can be that the preset drain time has ended, or that there is no water flow continuing to drain through the water level sensor or flow meter signal installed at the lowest point of the pipeline. When the control device determines that the drain process has been completed, two shutdown instructions are sequentially executed. The first instruction is to send a stop command to the driving unit of the circulating pump group, which will cut off the power supply of the pump group motor to stop its operation, thereby ending the hydraulic circulation in the entire water treatment cycle. The second instruction is to send a closing command to the driving mechanism of the drain valve group, which drives the drain valve to reset from its open state to a completely closed state, thereby cutting off the connection between the system waterway and the external drain passage, so that the system returns to a closed standby state ready for the next working cycle. The execution sequence of the two instructions can be set to be executed in sequence or designed to be executed basically synchronously. After execution, the control device can update the overall state of the system to standby or ready.

[0085] For example, according to the program setting, the control device starts a 30-second drain timer after opening the drain valve in step S3. After the timer ends, the control device defaults that the water in the pipeline has been basically emptied, and then executes step S4. The control device first cuts off the control coil loop of the circulating pump group contactor through its digital output port, the contactor is disconnected, and the circulating pump group stops running. Then, the control device sends a power-off instruction to the electromagnetic coil of the drain valve, and the electromagnetic valve resets under the action of the spring, and the valve is closed. The drain state indicator light on the operation panel is turned off, and a prompt information that the system is ready is displayed. The system thus completes a full-automatic processing process from sterilization, heating, circulation to emptying.

[0086] In a possible embodiment, the water treatment system further comprises: a flow rate meter; the flow rate meter is arranged in the water channel and electrically connected with the control device; S1, controlling the water UV sterilization device to irradiate the water flowing through the water channel, comprising: S11, acquiring the real-time water flow rate of the water channel by the flow rate meter.

[0087] The control device reads the signal output by the flow rate meter arranged in the water channel through electrical connection. The flow rate meter senses the flow rate of the water flowing through the measurement section in real time and converts the physical quantity into a standard electrical signal, such as an analog voltage current signal or a digital pulse signal. The control device periodically collects the electrical signal through the built-in analog input module or digital input interface. The original signal collected is processed inside the control device, such as analog-digital conversion calculation, pulse frequency conversion or analysis through a pre-set calibration curve, to finally obtain the real-time water flow rate value expressed in a specific unit. The value is stored in the register or storage area of the control device for subsequent logical judgment and control output.

[0088] For example, a turbine flow sensor is installed in the water channel as the flow rate meter. When the water flow drives the internal impeller to rotate, the magnet on the impeller generates a pulse signal every time it passes through the Hall element. The pulse signal is transmitted to the special high-speed counting port of the control device through the cable. The program of the control device is set to read the pulse number of the port per second. According to the factory calibration parameter of the sensor, 50 pulses per second correspond to a water flow rate of 1 cubic meter per hour. If the control device reads 100 pulses in 1 second, the current real-time water flow rate is calculated to be 2 cubic meters per hour.

[0089] S12, dynamically adjusting the output power or pulse duty cycle of the water UV sterilization device according to the real-time water flow rate, so that the water receives an ultraviolet radiation dose not lower than a pre-set sterilization dose threshold.

[0090] Wherein, the control device obtains the real-time water flow rate, and performs the adjustment operation according to the basic principle of ultraviolet disinfection. The sterilization effect of ultraviolet on water body depends on the total dose of ultraviolet radiation received by the water body, which is the product of the ultraviolet irradiation intensity and the irradiation time of the water body. For a fixed irradiation cavity, the water flow rate determines the time of the water body passing through the cavity, that is, the irradiation time. In order to maintain the sterilization effect, it is necessary to ensure that the radiation dose is not less than the preset sterilization dose threshold. Therefore, the control device internally pre-stores adjustment logic or data table, which establishes the corresponding relationship between the water flow rate and the required ultraviolet output power or pulse operation duty cycle. When the water flow rate increases, the time of the water body passing through the irradiation area is shortened, in order to maintain the same dose, the control device increases the output power of the ultraviolet lamp tube in the water body UV sterilization device or increases the duty cycle of the high-frequency pulse operation according to the above-mentioned corresponding relationship, so as to improve the irradiation intensity. Conversely, when the water flow rate decreases, the output power or duty cycle is correspondingly reduced. The control device realizes the dynamic adjustment by sending corresponding adjustment instructions to the ballast or power driving module of the water body UV sterilization device, so as to continuously ensure the reliability of the sterilization effect under the condition of changing water flow. The determination of the preset sterilization dose threshold is based on the ultraviolet sensitivity data of the key pathogenic microorganisms (such as bacteria, viruses and protozoan cysts) to be inactivated in the target water body, and the engineering safety factors and system performance fluctuations are considered.

[0091] Wherein, the corresponding relationship between the water flow rate and the required ultraviolet output power or pulse operation duty cycle is determined by the following core formula or principle relationship, which ensures that the ultraviolet radiation dose is constant.

[0092] The basic dose relationship required to maintain effective sterilization is: The preset sterilization dose threshold (D) ≤ ultraviolet irradiation intensity (I) × effective irradiation time (T) Wherein, for a fixed length of ultraviolet irradiation cavity, the effective irradiation time (T) is determined by the cavity length (L) and the real-time water flow rate (V), that is, T=L / V.

[0093] Therefore, the relationship can be specified as: D≤I×(L / V).

[0094] In order to always keep the inequality, the required ultraviolet irradiation intensity (I_required) should be at least: I_required≥D×V / L.

[0095] Since the output irradiation intensity (I) of the ultraviolet lamp tube is proportional to its electric power (P) or pulse operation duty cycle (η) (within the range of lamp tube characteristics), that is, I∝P or I∝η, a system proportionality constant (k) can be introduced to obtain the final adjustment relationship: P_required = k x (D x V / L).

[0096] or η_required = k' x (D x V / L).

[0097] P_required: the required regulated UV lamp output power (unit: watt, W) to achieve a constant dose.

[0098] η_required: the required regulated pulse duty cycle (unitless, usually in the range of 0-100%) to achieve a constant dose.

[0099] k or k': the system proportionality constant, determined by the UV lamp characteristics, ballast efficiency, irradiation chamber reflectivity, and optical configuration, and can be obtained by system calibration experiments (unit: k in W-s / m, k' in %-s / m).

[0100] D: the preset disinfection dose threshold, i.e., the minimum UV radiation dose (unit: joule per square meter, J / m2, or millijoule per square centimeter, mJ / cm2) required to ensure disinfection effectiveness.

[0101] V: the real-time water flow velocity obtained by a flow meter (unit: meter per second, m / s).

[0102] L: the effective length of the UV irradiation chamber, i.e., the length of the flow channel where the water body is exposed to UV light (unit: meter, m). For example, the preset disinfection dose threshold is 40 millijoules per square centimeter. The control device internally stores a corresponding table indicating that when the water flow velocity is 1 cubic meter per hour, the water body UV disinfection device needs to be controlled to operate at a rated power of 60%; when the velocity increases to 2 cubic meters per hour, it needs to be increased to a rated power of 95%. The control device calculates a velocity value of 2 cubic meters per hour according to step S11, queries the table, and immediately sends a control voltage signal corresponding to a power level of 95% to the electronic ballast of the UV lamp through the analog output port. After receiving the signal, the ballast adjusts its output to make the UV lamp work in this enhanced mode, thereby ensuring that the high-speed flowing water body can still obtain a radiation dose of not less than 40 millijoules per square centimeter.

[0103] In one possible embodiment, S2, based on the real-time water temperature measured by the temperature sensor, the water body heating device is controlled to heat the water in the waterway to a preset disinfection target temperature, including: S21, calculating the difference between the real-time water temperature and the disinfection target temperature.

[0104] The control device, after obtaining real-time water temperature data from the temperature sensor, performs a subtraction operation. The minuend is a fixed parameter pre-stored in the control device, namely the sterilization target temperature; the subtrahend is the real-time water temperature currently measured and acquired by the temperature sensor. The control device's calculation unit subtracts the two, and the result is the difference between the real-time water temperature and the target temperature. This difference is a positive or negative value; when the real-time water temperature is lower than the target temperature, the difference is positive, indicating that heating is needed; when the real-time water temperature reaches or exceeds the target temperature, the difference is zero or negative. This calculated difference is used as the core input variable of the subsequent power adjustment algorithm, quantifying the distance between the current system state and the desired state.

[0105] For example, the preset sterilization target temperature in the control device is 85 degrees Celsius. In a certain control cycle, the real-time water temperature data transmitted by the temperature sensor is 70 degrees Celsius. The processor of the control device performs a subtraction calculation, subtracting 70 from 85, resulting in a difference of +15 degrees Celsius. This +15 result is stored in a specific data register, indicating that the current water temperature still needs to rise by 15 degrees to reach the target.

[0106] S22. The output power of the water heating device is dynamically adjusted through the PID algorithm so that the water in the water circuit reaches and is maintained at the sterilization target temperature.

[0107] The control device employs a Proportional-Integral-Derivative (PID) algorithm to dynamically and smoothly drive the water heating device. The control device inputs the real-time temperature difference calculated in step S21 into the PID algorithm's calculation module. This algorithm comprises three parts: a proportional unit, an integral unit, and a derivative unit, working together. The proportional unit generates a basic adjustment based on the instantaneous magnitude of the current difference; the larger the difference, the stronger the output adjustment. The integral unit accumulates and sums historical differences, primarily used to eliminate static errors in the system, ensuring the water temperature ultimately stabilizes precisely at the target value. The derivative unit performs predictive adjustment based on the rate of change of the difference, suppressing rapid fluctuations or overshoot in the water temperature and improving the response speed and stability of the control system. The control device repeatedly executes the PID calculation according to a fixed sampling and control cycle, for example, several times per second. Each calculation integrates the outputs of the three units, ultimately synthesizing a real-time, continuous, or stepped control signal. The control signal is sent to the power controller of the water heating device, such as a solid-state relay or voltage regulator module, which linearly or in specific steps adjusts the current or voltage supplied to the heating element, i.e., adjusts its output power. Through this closed-loop feedback and dynamic adjustment, the water in the water circuit can be heated efficiently and ultimately reach and stably maintain within a very small error range near the preset sterilization target temperature.

[0108] For example, the control device executes a PID control loop at a frequency of once per second. When the input difference is positive fifteen degrees Celsius, the proportional unit immediately outputs a large base power command. At the same time, the integral unit begins to accumulate the difference, and the derivative unit monitors the rate of change of the difference. After several cycles, the water temperature rises to eighty degrees Celsius, at which point the difference is positive five degrees. The proportional unit outputs less, but the integral unit continues to output due to the cumulative effect of the previous difference, and the derivative unit can output a suppressive adjustment amount as the rate of temperature rise begins to slow. The PID algorithm synthesizes these factors to calculate a power control value that is lower than the initial stage but still effective, and reduces the actual average power of the heating tube from full three thousand watts to about fifteen hundred watts by adjusting the on-off time ratio of the solid-state relay. When the water temperature reaches eighty-four point nine degrees Celsius, the difference is very small, and the PID algorithm outputs a very small maintenance power that just compensates for the heat loss of the system, so that the water temperature stabilizes at eighty-five degrees Celsius.

[0109] In one possible embodiment, further comprising: S5, during the heating process, if it is detected that the circulating pump group stops working, the water body heating device is controlled to stop heating.

[0110] The step is a key safety protection logic executed by the control device during the heating process. The control device needs to continuously or periodically monitor the working state of the circulating pump group to determine whether it is in an effective operating state. There are various ways to achieve monitoring, such as by detecting the current sensor signal of the power supply circuit connected to the circulating pump group, by reading the running state signal feedback by the frequency converter or contactor driving the pump group motor, or by monitoring the water flow switch, pressure switch, and other sensors closely related to the pump group operation. The control device internally presets a logical judgment that the circulating pump group is in a "stop working" state. This state not only includes the case where the pump group power is actively cut off, but also includes the case where the pump group is abnormally stopped due to failure, stalling, or line problems. Once the control device identifies that the circulating pump group has entered a stop working state through any of the above monitoring methods, regardless of the current water temperature, it will immediately trigger a protection action. The protection action is that the control device sends a forced shutdown command to the power execution unit of the water body heating device. This command has the highest priority and can interrupt the ongoing PID regulation or other heating control program, directly cutting off the power supply to the heating element to immediately terminate the heating behavior. This effectively prevents the safety risks of local water temperature being too high, water body heating device dry burning damage, and even system pipe pressure being too high that may be caused by continuous heating in the absence of water body circulation heat dissipation.

[0111] In one possible embodiment, the water treatment system further comprises: an ice bin UV sterilization device and an ice bin; the ice bin UV sterilization device is electrically connected with the control device, and the ice bin UV sterilization device comprises n UV lamps, the n UV lamps are arranged at different positions in the ice bin, and n is an integer greater than 1; The water path sterilization method further comprises: S6, when it is detected that the preset ice bin sterilization condition is met, controlling the n UV lamps in the ice bin UV sterilization device to emit ultraviolet rays at maximum output power; The ice bin sterilization condition at least comprises: detecting that there is no ice in the ice bin, and the ice bin door is in a closed state.

[0112] Specifically, this step is independently executed by the control device, and is aimed at thoroughly sterilizing the internal space of the ice bin. The control device needs to continuously or periodically monitor two key judgment signals related to the state of the ice bin to determine whether the preset ice bin sterilization condition is met. The first condition is to detect that there is no ice in the ice bin. This is usually achieved by a special sensor installed on the inner wall or a specific position of the ice bin, for example, an infrared thermal imaging sensor analyzes the temperature distribution in the bin to determine the ice-free state, or a photoelectric sensor detects whether the reflection characteristics of the ice surface to the light disappear, or a comprehensive logic of monitoring the working period of the ice maker and the temperature in the bin is used for inference. The second condition is to confirm that the ice bin door is in a reliable closed state. This is achieved by a door state detection switch installed on the door frame of the ice bin, such as a magnetic reed switch or a travel switch, which is triggered when the door is completely closed and sends a level signal to the control device indicating that the door is closed. Only when the control device receives valid “no ice” signals and “door closed” signals at the same time in the same judgment period, it is determined that the ice bin sterilization condition is met. Once the condition is met, the control device immediately sends a start command to the driving circuit of the ice bin UV sterilization device. The command controls all n UV lamps arranged in the ice bin to provide rated working voltage at the same time, or drives the electronic ballast to run in full load mode, so that all UV lamps light up at the maximum output power marked by the manufacturer, emitting strong ultraviolet rays. These UV lamps arranged at different geometric positions such as the top and side wall of the ice bin can form a cross irradiation with no dead angle, ensuring that all surfaces inside the entire ice bin cavity are fully sterilized.

[0113] As a specific embodiment, the working state of the ice maker connected with the ice bin and the temperature in the bin can be monitored to make a comprehensive judgment. When the ice maker is in a non-ice making mode (such as standby or drainage mode) and the temperature sensor in the ice bin reads continuously above 0°C (for example, 2°C) for a preset time (for example, 10 minutes), the control device can determine that there is no ice or only a small amount of residual ice in the ice bin, meeting the ice-free condition.

[0114] For example, an infrared thermal imager is installed in the ice bin as a no-ice detection sensor. Its detection logic is that when the average temperature in the bin is higher than -2 degrees Celsius and the temperature distribution is uniform, it is determined that there is no ice. A normally closed magnetic switch is installed at the bin door. When the door is closed, the switch is closed and outputs a low-level signal. The control device reads these signals every 30 seconds. When the infrared thermal imager data is processed and determined to be in a no-ice state, and the door magnetic switch signal is a continuous low level at the same time, the control device determines that the conditions are met. Subsequently, the control device simultaneously closes three independent relay control circuits, and the three circuits correspond to the three UV lamps installed on the ceiling and two side walls of the ice bin. After the relay is attracted, 220-volt alternating current is directly applied to the input end of the ballast of each UV lamp, and the three UV lamps are immediately turned on at 100% rated power (for example, 30 watts per lamp) to start the 10-minute strong ultraviolet sterilization of the empty ice bin. During the entire sterilization period, the control device continuously locks the bin door closed signal, and as soon as it detects that the door is opened, it immediately cuts off the power supply of the UV lamp to ensure safety.

[0115] In one possible embodiment, the waterway disinfection method of the present application further comprises: When it is detected that the preset ice bin sterilization condition is not met, m UV lamps in the n UV lamps emit ultraviolet light at a preset output power; m is an integer less than n, and the preset output power is less than the maximum output power.

[0116] Specifically, this step is the control logic of the control device for the routine or maintenance disinfection of the ice bin. The control device continuously monitors two key state signals on which the ice bin disinfection condition depends, i.e. the signal of whether there is ice in the ice bin and the signal of the opening and closing state of the ice bin door. When the control device identifies that either condition is not met within the judgment period, for example, it detects that there is ice in the ice bin, or it detects that the ice bin door is in an incompletely closed state, it determines that the condition for performing high-intensity complete disinfection is not met at present. At this time, the control device executes a low-intensity disinfection lighting mode instead. The control device retrieves two preset parameters from its program memory, one is the number m of UV lamps that need to be lit, and the other is the preset output power value that these lamps should adopt. The number m refers to the number of UV lamps authorized to be lit when the complete disinfection condition is not met. Its determination is mainly based on the geometric layout of the ice bin and the routine disinfection requirement. Specifically, among the n UV lamps pre-installed inside the ice bin, a part (m) of the lamps installed in relatively hidden positions that are not easily observed by the user directly but whose irradiation range can still cover the main storage space inside the ice bin are selected. For example, the lamps installed on the top or rear wall of the ice bin are preferentially selected, while the lamps directly opposite the bin door or viewing window are avoided. The purpose of this design is to minimize the risk of visible UV leakage to the outside while maintaining the basic UV illumination in the bin space and inhibiting the activity of microorganisms when the bin door may not be completely closed or there is ice in the bin (which may block or reflect light). The number m is usually fixed and set in advance during the system design stage according to the above layout principles. The preset output power refers to the power level at which the m UV lamps work in the disinfection mode. Its determination is mainly based on the minimum UV dose required to maintain the basic disinfection effect and the safety and energy consumption limits of the equipment. This power value is significantly lower than the maximum output power, for example, it is set to 20% to 50% of the maximum power. The specific value can be set by referring to the following ways: first, determine the lower limit of the UV irradiation intensity required to inhibit the reproduction of common microorganisms (such as mold and common bacteria) in the ice bin under the expected, non-hermetic daily use state through experimental determination or according to industry experience data; second, combined with the product characteristics of the selected UV lamp tube, select a power level that is within the efficient working interval of the lamp tube, can be stably operated for a long time, and has low energy consumption. For example, 30% to 60% of the maximum power. The control device selects specific m UV lamps according to the predetermined rules and issues a start command to their drive circuit. The command contains the setting of the power level, and the drive circuit adjusts the voltage or working current supplied to these m UV lamps or controls them to operate in a specific pulse working mode accordingly, so that they work stably at the set, lower preset output power. This mode provides basic UV disinfection effect when complete disinfection cannot be performed, while reducing energy consumption and the intensity and range of accidental UV leakage when the door is not closed tightly.

[0117] For example, there are four UV lamps installed in the ice bin, two of which are located at the top and the other two are located at the side walls. The preset rule is that when the condition is not met, only the two UV lamps located at the top are started, i.e. m is equal to 2, and run at 50% of the rated power. When the control device detects that there is ice in the bin through the infrared sensor, or detects that the door is not fully attracted through the door magnetic switch, it is determined that the condition is not met. The control device then sends an instruction to the electronic ballast driving the two UV lamps at the top, which contains an analog voltage signal representing 50% power. After receiving the instruction, the ballast adjusts the output to make the two UV lamps at the top light up at half power, while the two UV lamps at the side walls remain off. This state will continue until the condition changes, for example, when the ice is taken out and the door is closed, the system automatically switches back to the full-power sterilization mode of step S6.

[0118] In one embodiment, a control device is provided, the internal structure diagram of which can be as shown in Figure 5 The control device includes a processor, a memory, a network interface and a database connected through a system bus. The processor of the control device is used to provide computing and control capabilities. The memory of the control device includes non-volatile and / or volatile storage media, internal memory. The non-volatile storage media stores an operating system, a computer program and a database. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage media to run. The network interface of the control device is used to communicate with external clients through network connection. The computer program is executed by the processor to implement a function or step based on the water disinfection method.

[0119] In one embodiment, a water treatment device is provided, which includes any of the above water treatment systems.

[0120] In one embodiment, a computer readable storage medium is provided, which stores a computer program, and the computer program is executed by a processor to implement any of the above water disinfection methods.

[0121] It should be noted that the functions or steps that can be achieved by the above-mentioned computer readable storage medium or water treatment device can be referred to the related description in the foregoing method embodiments. To avoid repetition, they will not be described one by one here.

[0122] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by a computer program instructing relevant hardware, and the computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, storage, database or other medium used in the embodiments provided in the present application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0123] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is exemplified, and in actual application, the above-mentioned functions can be completed by different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above.

[0124] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A waterway disinfection method, characterized in that, This device is used in a water treatment system, which includes: a control device, a circulating pump set, a water UV sterilization device, a temperature sensor, a water heating device, and a drain valve set; the control device is electrically connected to the circulating pump set, the water UV sterilization device, the temperature sensor, the water heating device, and the drain valve set, respectively. The waterway disinfection method includes: In response to the system power-on signal, the water UV sterilization device is controlled to irradiate the water flowing through the waterway; When the preset heating trigger condition is detected, the water heating device is controlled to heat the water in the water circuit to the preset sterilization target temperature based on the real-time water temperature measured by the temperature sensor, and the circulating pump group is controlled to circulate the heated water in all water circuit pipes. When the preset heating shutdown conditions are met, the water heating device is turned off, and the drain valve group is opened to drain the water in the pipeline. After the water in the pipeline is drained, the circulating pump group is stopped and the drain valve group is closed.

2. The waterway disinfection method according to claim 1, characterized in that, The preset heating trigger conditions include at least one of the following: Reaching the preset periodic disinfection time point; The cumulative water production or intake has reached the preset threshold; Received a mandatory disinfection command triggered by the user through the interface; The water UV sterilization device operates continuously for a first preset duration.

3. The waterway disinfection method according to claim 1, characterized in that, The preset heating termination conditions include at least one of the following: The continuous working time from the start of the water heating device reaches the second preset duration; The water temperature in the waterway is monitored and maintained above the sterilization target temperature for a period of time that reaches a third preset duration. The cumulative circulation time of the circulating pump set reaches the fourth preset duration.

4. The waterway disinfection method according to claim 1, characterized in that, The water treatment system further includes: a flow meter; the flow meter is installed in the water path and is electrically connected to the control device; The method of controlling the UV sterilization device for water to irradiate the water flowing through the waterway includes: The real-time water flow velocity of the waterway is obtained by a flow meter; Based on the real-time water flow velocity, the output power or pulse duty cycle of the water UV sterilization device is dynamically adjusted to ensure that the ultraviolet radiation dose received by the water body is not lower than the preset sterilization dose threshold.

5. The waterway disinfection method according to claim 1, characterized in that, The method of controlling the water heating device to heat the water in the water circuit to a preset sterilization target temperature based on the real-time water temperature measured by the temperature sensor includes: Calculate the difference between the real-time water temperature and the target sterilization temperature; The output power of the water heating device is dynamically adjusted by a PID algorithm so that the water in the water circuit reaches and is maintained at the target sterilization temperature.

6. The waterway disinfection method according to any one of claims 1 to 5, characterized in that, The water treatment system further includes: an ice storage UV sterilization device and an ice storage; the ice storage UV sterilization device includes n UV lamps and a drive control unit, the drive control unit is electrically connected to the control device and the n UV lamps respectively, and the n UV lamps are arranged at different positions inside the ice storage, where n is an integer greater than 1; The waterway sterilization method further includes: When the preset sterilization conditions for the ice chamber are met, the n UV lamps in the ice chamber UV sterilization device are controlled to emit ultraviolet light at maximum output power. The sterilization conditions for the ice chamber include at least the following: detecting that there is no ice inside the ice chamber and that the ice chamber door is closed.

7. The waterway disinfection method according to claim 6, characterized in that, Also includes: When the sterilization conditions of the ice chamber are not met, control m of the n UV lamps to emit ultraviolet light at a preset output power. m is an integer less than n, and the preset output power is less than the maximum output power.

8. A water treatment system, characterized in that, include: Control device, circulating pump set, water UV sterilization device, temperature sensor, water heating device, drain valve set; The control device is electrically connected to the circulating pump group, the water UV sterilization device, the temperature sensor, the water heating device, and the drain valve group, respectively. The control device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor being used to perform the steps of the waterway disinfection method as described in any one of claims 1 to 7.

9. A water treatment device, characterized in that, Includes the water treatment system as described in claim 8.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the waterway disinfection method as described in any one of claims 1 to 7.

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