Hotel air closed-loop disinfection and killing system based on multi-stage physical field cooperation and control method

Abstract

The invention discloses a hotel air closed-loop sterilization system based on multi-stage physical field cooperation and a control method, the system comprises a sealed negative pressure channel, a primary filter layer, an electrostatic sterilization module, a UVC array and a pulse xenon lamp sterilization layer are sequentially arranged in the channel in the airflow direction, a centrifugal fan is matched to maintain a negative pressure environment, and a closed-loop airflow path is formed. The electrostatic module oxidizes and inactivates microorganisms through ROS free radicals, the UVC array breaks DNA / RNA chains of the microorganisms, the pulse xenon lamp achieves end sterilization through photo-thermal synergy, and an action chain of'oxidation-gene disruption-thorough inactivation 'is formed through three-stage synergy. The system further comprises an internet-of-things control module which is linked with a hotel PMS system to automatically trigger disinfection and killing. According to the control method, intelligent operation is achieved through room state detection, negative pressure establishment, sealing detection, graded activation, dynamic duration control and real-time monitoring. The system solves the problems of insufficient safety and efficiency and high manual dependence degree of traditional sterilization, has the characteristics of high inactivation rate, no leakage risk and intelligence, and meets the requirements of hotel scenes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air purification, in particular to a hotel air closed-loop disinfection system based on multi-stage physical field cooperation and a control method. BACKGROUND

[0002] Hotels are closed places with intensive personnel flow, and air disinfection is a key link to ensure public health safety. The traditional hotel air disinfection system has the following problems: 1. Insufficient safety: traditional disinfection methods such as chemical disinfectants can produce harmful residues, causing potential harm to human health and the environment. 2. Low disinfection efficiency: single disinfection technology cannot effectively inactivate various microorganisms, resulting in long disinfection time and poor effect. 3. Low degree of intelligence: the existing system has low integration with the hotel management system, and cannot realize automatic and intelligent control. 4. Poor closedness: open disinfection system may cause pollution diffusion, increasing the risk of cross infection.

[0003] In the prior art, the related air disinfection scheme still has the following shortcomings in adapting to the hotel scene: For example, Chinese patent CN112696773A discloses an air disinfection device, which improves efficiency through the synergistic effect of high-voltage discharge, ultraviolet light source, and high-efficiency filter coated with hypochlorite gelatin microspheres. Although it reduces ozone concentration, it relies on chemicals such as hypochlorite, which has residual risk, and does not set up a closed negative pressure channel, which cannot avoid the leakage of pollutants during disinfection, and is not suitable for hotel rooms and other scenes that require strict closed loop. At the same time, its disinfection trigger relies on manual operation and does not link with the hotel management system, making it difficult to adapt to the operational needs of automatic disinfection after hotel check-out.

[0004] Chinese patent CN113154608A discloses a virus and bacteria killing device using nano-silver primary filter, active / passive electrostatic adsorption, and photocatalysis, which can achieve efficient disinfection, but relies on nano-silver materials and electric heating components, which has high energy consumption, and ozone control requires an additional negative ion generator, which complicates safety regulation in a hotel environment. It does not dynamically adjust the disinfection time for room size, making it difficult to adapt to the disinfection needs of different size rooms.

[0005] Therefore, there is an urgent need for a multi-stage physical field cooperative disinfection scheme that adapts to the hotel scene, eliminates pollution leakage through closed negative pressure design, realizes automatic operation through intelligent linkage, balances disinfection efficiency, safety, and economy, and solves the core pain points of traditional technology in hotel air disinfection, such as weak targeting, high leakage risk, and strong reliance on manual operation. SUMMARY

[0006] The present application overcomes the shortcomings of the above-mentioned technology and provides a hotel air closed-loop disinfection system based on multi-stage physical field cooperation and a control method.

[0007] To achieve the above object, the application adopts the following technical scheme: The first aspect of the embodiment of the application discloses a hotel air closed-loop disinfection system based on multi-stage physical field cooperation, comprising: The hotel air closed-loop disinfection system based on multi-stage physical field cooperation comprises a disinfection system 1, which comprises a sealed negative pressure channel 101 provided with an air return port 11 and an air outlet 12 along the air flow input and output directions; The sealed negative pressure channel 101 is provided with, in sequence along the air flow direction, A primary efficiency filter layer 102 is arranged at the air return port 11 position of the sealed negative pressure channel 101; An electrostatic sterilization module 103 is used for oxidizing and inactivating microorganisms; A UVC array 104 is used for destroying the microorganism structure by irradiation to realize secondary deep inactivation; A pulsed xenon lamp sterilization layer 105 is used for photo-thermal cooperative inactivation of the residual microorganisms after the previous two-stage treatment to realize terminal disinfection; The disinfection system further comprises: A centrifugal fan 106 arranged in the sealed negative pressure channel 101 is used for realizing the air draft function to maintain the negative pressure state of the sealed negative pressure channel 101; An Internet of Things control module 107 is linked with the hotel PMS system to trigger disinfection.

[0008] Preferably, the primary efficiency filter layer 102 has a filtering precision of ≥5 μm; the electrostatic sterilization module 103 is provided with a needle plate electrode, and the working voltage is ±10-15 kV; the UVC array 104 is a deep ultraviolet UVC array, the wavelength is 265±5 nm, and the irradiation intensity is ≥200 μW / cm²; and the pulsed xenon lamp sterilization layer 105 has a spectral range of 200-1100 nm, and a single pulse energy density of 1.0-2.0 J / cm².

[0009] Preferably, the disinfection system further comprises a V-shaped baffle 108 arranged in the sealed negative pressure channel 101; and the V-shaped baffle 108 is arranged after the UVC array 104 along the air flow direction.

[0010] Preferably, the disinfection system further comprises a differential pressure sensor 109 arranged in the sealed negative pressure channel 101, which is used for monitoring the resistance of the primary efficiency filter layer 102 in real time and automatically triggering the backwashing program through the Internet of Things control module 107.

[0011] Preferably, the electrode surface of the electrostatic sterilization module 103 is provided with a TiO2 nano coating.

[0012] Preferably, the sterilization and killing system further comprises a temperature sensor 110 arranged in the sealed negative pressure channel 101 and installed downstream of the pulsed xenon lamp sterilization layer 105, for real-time detection of the sterilization and killing system temperature.

[0013] The second aspect of the embodiment of the present application discloses a control method of a hotel air closed-loop sterilization and killing system based on multi-level physical field cooperation, applied to the hotel air closed-loop sterilization and killing system of the first aspect, which comprises the following steps: Step S1, real-time detection of the hotel room state, if it is detected that the guest has checked out, the hotel PMS system sends a check-out cleaning instruction to the Internet of Things control module 107; if it is detected that the guest has not checked out, the system is in standby state until the room state is updated; Step S2, after the Internet of Things control module 107 receives the check-out cleaning instruction, the centrifugal fan 106 is started, and the static pressure value of the sealed negative pressure channel 101 is maintained at a preset negative pressure threshold; Step S3, monitoring the static pressure stability of the sealed negative pressure channel 101 to determine whether the sealing property is normal; if not, an abnormal alarm instruction is generated and the operation is terminated; if normal, the next step is executed; Step S4, starting the electrostatic sterilization module 103, the UVC array 104 and the pulsed xenon lamp sterilization layer 105 in a preset order; Step S5, calculating the sterilization and killing time T according to the volume of the guest room, and controlling each sterilization and killing unit to continuously operate for the sterilization and killing time T.

[0014] Preferably, the method further comprises the following steps: Step S6, continuously detecting the pressure difference before and after the primary filter layer 102 through the differential pressure sensor 109, and when the pressure difference exceeds the preset threshold, determining that the resistance is abnormal, triggering the backwashing program or replacing the primary filter layer 102.

[0015] Preferably, the method further comprises the following steps: Step S7, continuously collecting temperature data through the temperature sensor 110 installed downstream of the pulsed xenon lamp sterilization layer 105, and when the temperature exceeds 70℃, immediately terminating the operation and closing all sterilization and killing units.

[0016] Preferably, the method further comprises the following steps: Step S8, if neither step S6 nor step S7 triggers an abnormality, after running for the time T, a complete sterilization and killing instruction is generated and all sterilization and killing units are automatically closed, and a sterilization and killing report is uploaded to the cloud; wherein T=0.8×V(min); V is the volume of the guest room of the sterilized hotel room.

[0017] Compared with the prior art, the embodiment of the present application has the following beneficial effects: 1. The sealed negative pressure channel of the hotel air closed-loop disinfection system maintains a stable negative pressure state through a centrifugal fan, and cooperates with the directional airflow design of the air return outlet and the air outlet to ensure that the air containing microorganisms only circulates in the closed channel during the disinfection process, without the risk of leakage, effectively blocking the cross-infection path and reducing the potential safety hazards of public health in hotels. Secondly, the primary filter layer in the case realizes primary filtration, pre-intercepts large particle impurities, and reduces the interference of subsequent disinfection units. Thirdly, the electrostatic sterilization module first destroys the cell membrane and protein of microorganisms through the generated ROS free radicals, achieving the first level of oxidation inactivation; the UVC array further breaks the DNA / RNA chain, achieving the second level of deep inactivation; the pulse xenon lamp sterilization layer finally achieves complete inactivation of residual microorganisms through light-heat synergy; achieving the third level of light-heat synergy inactivation; in this way, through the three levels of disinfection, the progressive action chain of "oxidizing microbial cell membrane and protein → gene damage → terminal inactivation" is formed, achieving the inactivation effect of multi-level physical field synergy, so as to improve the inactivation efficiency of bacteria, viruses, fungi and other types of microorganisms, solving the problem of traditional single disinfection technology "weak targeting and incomplete inactivation". Moreover, the pure physical disinfection method can replace traditional chemical disinfectants, avoiding harmful residues from irritating the respiratory tract and skin of the human body and causing secondary pollution to the environment, especially suitable for high-frequency stay scenes such as hotel rooms. In addition, the Internet of Things control module is linked with the hotel PMS system, which can automatically trigger the disinfection process after the guest checks out, without the need for manual operation, reducing the turnover time of room cleaning, improving the operation efficiency and intelligent level of the hotel, and adapting to the operation needs of the hotel.

[0018] 2. By setting the differential pressure sensor, the resistance of the primary filter layer can be monitored in real time, so that the clogging of the primary filter layer can be found in time, ensuring the filtration efficiency and air flow of the system. Secondly, by setting the differential pressure sensor at the end position, the instantaneous resistance interference of the intermediate module is avoided, which is more in line with the actual operation and maintenance needs of the long-term clogging of the primary filter layer, so as to more accurately reflect the long-term cumulative resistance of the primary filter layer at the front end. In addition, since the differential pressure sensor is set downstream of the V-shaped baffle, the airflow at the end can be stabilized through the synergistic effect of the structure of the V-shaped baffle, reducing the influence of turbulence on pressure monitoring and allowing the sensor to obtain more reliable pressure data. In addition, since the primary filter layer is the first line of defense of the air duct, timely backwashing can prevent the clogging from further aggravating and avoid overloading of the centrifugal machine and efficiency reduction of the disinfection unit due to insufficient airflow. At the same time, through the action of the Internet of Things module, the hotel PMS system is linked, from pressure monitoring to backwashing trigger, without manual intervention, the automatic monitoring and cleaning process reduces the frequency of manual inspection and filter replacement, reduces maintenance costs, improves the intelligent level, and at the same time ensures the continuous and stable operation of the disinfection system.

[0019] 3. The case control method detects the hotel room status in real time and links the PMS system. Only after the guest checks out, the disinfection process is automatically triggered to avoid invalid operation of empty guest rooms or accidental start of guest rooms. The control method realizes on-demand disinfection from instruction reception to fan start, sealing detection, disinfection unit activation, temperature detection, disinfection completion according to the calculated time, and report uploading. The whole process does not require manual intervention and is automatically executed through the Internet of Things control module to avoid substandard disinfection caused by human operation errors and ensure the standardization and consistency of each room disinfection process. Furthermore, the setting of detecting the static pressure stability of the sealed negative pressure channel before starting disinfection avoids leakage operation from the source, ensures the disinfection quality, and ensures sufficient contact between the disinfection unit and microorganisms. In addition, by limiting the disinfection sequence according to the activation of the electrostatic sterilization module, UVC array, and pulsed xenon lamp sterilization layer, the disinfection effect is improved through multi-level physical field synergistic effect to form a progressive disinfection chain. Moreover, the differential pressure sensor continuously monitors the resistance of the primary filter layer during the disinfection process to detect the blockage of the primary filter layer in time, avoid airflow speed reduction and insufficient microbial retention time caused by blockage, and ensure the effective action of UVC irradiation and pulsed xenon lamp sterilization layer photothermal effect. 4. The setting of the temperature sensor of the present case monitors the downstream temperature of the pulsed xenon lamp in real time. When the temperature exceeds 70℃, the operation is immediately terminated and the disinfection unit is closed to realize over-temperature protection and reduce safety risks. Finally, the setting of automatically uploading the report containing the microbial inactivation rate and operation parameters to the cloud after disinfection is completed facilitates the visual supervision and traceability of the disinfection effect by the hotel operator, ensures that the room is put into use after meeting the hygiene standards, and forms a complete closed loop of "disinfection - recording - traceability". BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. Those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0021] Figure 1 is the architecture schematic diagram of the hotel air closed-loop disinfection system of the first embodiment of the present case.

[0022] Figure 2 is the architecture schematic diagram of the hotel air closed-loop disinfection system of the second embodiment of the present case.

[0023] Figure 3 is the flowchart of the third embodiment of the present case. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first," "second," "third," "fourth," etc. in the description and claims of the present invention are used to distinguish different objects rather than to describe a specific order. The terms "including" and "having," as well as any variations thereof, in the embodiments of the present invention, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or are inherent to these processes, methods, products, or apparatuses.

[0026] Example 1 like Figure 1 As shown, a hotel air closed-loop disinfection system based on multi-level physical field collaboration, the disinfection system 1 includes: A sealed negative pressure channel 101 is provided with an air return port 11 and an air outlet 12; The sealed negative pressure channel 101 is provided with the following components in sequence along the airflow direction: The primary filter layer 102 is located at the return air inlet 11 of the sealed negative pressure channel 101 and has a filtration accuracy of 5 μm or higher. As the first barrier for air entering the air duct, the primary filter layer 102, with a filtration accuracy of 5 μm or higher, intercepts large airborne pollutants such as dust, hair, and fibers, preventing them from adhering to the surface of subsequent disinfection units and affecting their effectiveness and service life. In practice, the primary filter layer 102 can be a filter screen.

[0027] The electrostatic sterilization module 103 is provided with a needle plate electrode (for details, refer to the patent document with the patent publication number CN212081756U), and the working voltage is ±10-15kV, which is used to generate ROS (reactive oxygen species) free radicals; the generated ROS free radicals first oxidize and attack microorganisms, destroying their cell membrane structure and / or protein molecules (for viruses, there is no cell membrane). Specifically, when the voltage of the needle plate electrode is lower than 10kV, the ROS free radical yield is insufficient, resulting in a decrease in sterilization efficiency; when the voltage is higher than 15kV, excessive ozone is easily generated, causing secondary pollution, and the energy consumption increases significantly. Therefore, the system sets the working voltage of the needle plate electrode in the range of ±10-15kV, and through this voltage range, the ROS yield and energy consumption can be balanced optimally, and sufficient corona discharge and ROS free radicals can be generated stably; in specific implementation, 12kV can be preferentially selected, which meets the conditions and leaves a safety margin.

[0028] The UVC array 104 is a deep ultraviolet UVC array with a wavelength of 265±5nm, which can be used to emit deep ultraviolet light with a wavelength of about 265nm; its irradiation intensity is ≥200μW / cm², which can destroy the DNA / RNA structure of microorganisms through irradiation, making them lose the ability to reproduce and achieve secondary deep inactivation.

[0029] The pulse xenon lamp sterilization layer 105 has a spectral range of 200-1100nm and a single pulse energy density of 1.0-2.0J / cm², which can completely inactivate the microorganisms remaining after the previous two stages of processing through high-energy-density broadband light and instantaneous high-temperature effects. Specifically, a pulse xenon lamp is used, the broadband light can cover multiple biological inactivation bands, and the instantaneous high temperature (which can reach several hundred degrees Celsius) further destroys the protein structure of microorganisms, achieving terminal sterilization through light-heat synergy.

[0030] Further, the sterilization system also includes a centrifugal fan 106 arranged in the sealed negative pressure channel 101, which is used to realize the function of air extraction, maintain the negative pressure state of the sealed negative pressure air duct, and drive the air to flow through each processing module according to the preset path, and the air volume is adapted to the volume of the guest room (ACH≥5 / h); specifically, the static pressure value of the sealed negative pressure air duct 101 needs to be maintained in the range of -30~-50Pa, so the establishment and stability of this negative pressure state depend on the air extraction function of the centrifugal fan. By continuously extracting air, a negative pressure is formed inside the air duct relative to the outside, ensuring that during the sterilization process, the air in the guest room can only be sucked into the air duct for processing, and there is no risk of contamination leaking from the air duct to the outside, effectively avoiding the risk of contamination and cross infection that may be caused by an open sterilization system, so as to realize closed-loop sterilization.

[0031] Further, the sterilization system also includes: An Internet of Things control module 107 is linked to a hotel PMS system to trigger disinfection. Through the linkage with the hotel PMS system (hotel management system), the disinfection process is automatically triggered after the guest checks out, realizing unmanned intelligent operation; at the same time, the data of various sensors are received to control the start-stop sequence and operating parameters of various modules.

[0032] As described above, the sealed negative pressure channel of the present case maintains a stable negative pressure state through the centrifugal fan, and cooperates with the directional airflow design of the air return port and the air outlet to ensure that the air containing microorganisms in the disinfection process only circulates in the closed channel without the risk of leakage, effectively blocking the cross-infection path and reducing the potential safety hazard of public health in hotels. Secondly, the primary filtration layer 102 of the present case realizes primary filtration and pre-intercepts large-particle impurities, reducing the interference of subsequent disinfection units. Thirdly, the electrostatic sterilization module 103 first destroys the microbial cell membrane through the generated ROS free radicals to realize the first level of oxidation inactivation; the UVC array 104 further breaks the DNA / RNA chain to realize the second level of deep inactivation; the pulsed xenon lamp sterilization layer 105 finally completely inactivates the residual microorganisms through light-heat synergy to realize the third level of light-heat synergy inactivation; in this way, through the three levels of disinfection, the progressive action chain of “oxidation → gene damage → terminal inactivation” is formed, realizing the inactivation effect of multi-level physical field synergy to improve the inactivation efficiency of bacteria, viruses, fungi and other types of microorganisms, solving the problem of traditional single disinfection technology “weak targeting and incomplete inactivation”. Moreover, the pure physical disinfection method is adopted to replace the traditional chemical disinfectant, which can avoid the stimulation of harmful residues to the respiratory tract and skin of human body and the secondary pollution to the environment from the root, especially suitable for hotel rooms and other high-frequency stay scenes. In addition, the Internet of Things control module 107 is linked to the hotel PMS system to automatically trigger the disinfection process after the guest checks out, without the need for manual operation, reducing the turnover time of guest rooms, improving the operation efficiency and intelligent level of hotels, and adapting to the operation needs of hotels.

[0033] In addition, the system limits the key technical parameter range of the primary filter layer, needle plate electrode, UVC array, and pulsed xenon lamp sterilization layer. By limiting the filtering accuracy of the primary filter layer to be greater than or equal to 5 μm, it is ensured that large-particle pollutants such as dust and pollen are effectively intercepted, reducing the burden on the subsequent disinfection unit, while maintaining a reasonable airflow resistance. The working voltage of the needle plate electrode of the electrostatic sterilization module is limited to the range of ±10-15 kV. Through this voltage range, the best balance between ROS yield and energy consumption can be achieved. The wavelength of the UVC array 104 is limited to 265±5 nm, so as to accurately match the absorption peak (260-280 nm) of microbial DNA, avoid the absorption of oxygen in the air due to too short wavelength (such as <240 nm), and avoid the decrease of DNA absorption efficiency due to too long wavelength (such as >280 nm), thereby ensuring efficient inactivation. The irradiation intensity of the UVC array 104 is set to be greater than or equal to 200 μW / cm², so as to meet the minimum disinfection requirement and be compatible with intensity adjustment in different scenarios. The spectral range of the pulsed xenon lamp sterilization layer 105 is set to 200-1100 nm, so as to cover ultraviolet to near-infrared with wide spectrum, and have photochemical and photothermal effects. The single-pulse energy density is set to be in the range of 1.0-2.0 J / cm², which can avoid overuse and reduce light decay, so as to balance the inactivation effect and the service life of the equipment.

[0034] As a preferred embodiment, the disinfection system further comprises a V-shaped baffle 108 arranged in the sealed negative pressure channel 101, which is arranged after the UVC array 104 along the airflow direction. In this way, the airflow path is increased by the V-shaped baffle, and the residence time of microorganisms in the disinfection area is prolonged, so that the residence time of microorganisms is greater than or equal to 3 seconds, and the inactivation rate is improved. In addition, the V-shaped structure can make the airflow more evenly distributed in the disinfection area, reduce airflow dead angles, and ensure that all air is fully treated. In specific implementation, the baffle is made of corrosion-resistant and high-reflectivity aluminum alloy material; the V-shaped angle is 45° to 75°, preferably 60°; in this way, it is avoided that due to too small angle (<45°), the baffle spacing is too dense, and turbulent dead angles are easily formed; and it is avoided that due to too large angle (>75°), the airflow path is shortened, the residence time of microorganisms is less than 3 seconds, and the microorganisms cannot be fully inactivated; in the angle range of 45°-75°, the time requirement of multi-stage disinfection is met; when the angle is 60°, the residence time and airflow resistance reach the best balance.

[0035] As a preferred embodiment, the sealed negative pressure channel 101 is provided with a pressure difference sensor 109 between the V-shaped baffle 108 and the air outlet 12, which is used to monitor the resistance in real time and automatically trigger the backwashing program. Specifically, the pressure difference sensor 109 is located after the V-shaped baffle and close to the air outlet 12, i.e. at the end of the air duct, which can indirectly reflect the clogging degree of the front-end primary filter layer 102 by monitoring the pressure change at the end of the air duct. When the filter screen causes the resistance to increase due to the accumulation of pollutants, the overall airflow resistance of the air duct rises, and the end pressure deviates from the preset range. When the sensor captures this abnormality, it automatically triggers the backwashing program to clean the filter screen. When the pressure difference sensor 109 detects that the end pressure difference exceeds the preset threshold, the Internet of Things control module 107 determines that the front-end primary filter layer has been clogged, and automatically starts the backwashing program (such as reversing the airflow to blow off the surface pollutants of the primary filter layer).

[0036] As described above, first, by setting the pressure difference sensor 109, the resistance of the primary filter layer can be monitored in real time, so that the clogging of the primary filter layer can be found in time, and the filtering efficiency and air flow of the system can be ensured. Second, by setting the pressure difference sensor 109 at the end position, the instantaneous resistance of the intermediate module is avoided, which is more in line with the actual operation and maintenance requirements of the long-term clogging of the primary filter layer, so as to more accurately reflect the long-term cumulative resistance of the front-end primary filter layer. In addition, since the pressure difference sensor 109 is set downstream of the V-shaped baffle, the airflow at the end can be stabilized through the synergistic effect of the structure of the V-shaped baffle 108, reducing the influence of turbulence on pressure monitoring, and allowing the sensor to obtain more reliable pressure data. In addition, since the primary filter layer is the first line of defense of the air duct, timely backwashing can prevent the clogging from further intensifying, and avoid overloading of the centrifuge and efficiency reduction of the disinfection unit (such as static electricity and UVC) due to insufficient airflow. At the same time, through the action of the Internet of Things module, the hotel PMS system is linked, and from pressure monitoring to backwashing triggering, the whole process does not require manual intervention. The automatic monitoring and cleaning process reduces the frequency of manual inspection and filter screen replacement, reduces maintenance costs, improves the intelligent level, and at the same time ensures the continuous and stable operation of the disinfection system.

[0037] As a preferred embodiment, the electrode surface of the static electricity sterilization module 103 is provided with a TiO2 nano coating, which activates the photocatalytic reaction during corona discharge. In a specific implementation, a layer of TiO2 nano coating with a thickness of 100-200 nm is deposited on the surface of the needle-plate electrode of the static electricity sterilization module 103 by sol-gel method. When the electrode working voltage is set to ±12kV, the high-energy electrons generated by corona discharge can activate the TiO2 coating and trigger the photocatalytic reaction. This synergistic effect not only enhances the generation of ROS free radicals, but also continuously decomposes organic pollutants adsorbed on the electrode surface, keeping the electrode surface clean and improving the long-term operation efficiency of the system.

[0038] As mentioned above, the TiO2 nano coating is activated during corona discharge, generating additional active oxygen species such as hydroxyl radicals (OH) and superoxide anions (O2⁻), which have strong oxidizing ability and can more effectively decompose and inactivate microorganisms, enhancing the disinfection effect. Moreover, the photocatalytic effect of TiO2 and the ROS radicals generated by corona discharge form a synergistic effect, further improving the disinfection efficiency. In addition, the TiO2 coating has photocatalytic self-cleaning properties, which can decompose organic pollutants adsorbed on the electrode surface, prolonging the service life of the electrode and reducing maintenance requirements.

[0039] Example Two As Figure 2 shown, on the basis of Example One, the disinfection system further comprises a temperature sensor 110 arranged in the sealed negative pressure channel 101 and installed downstream of the pulsed xenon lamp sterilization layer 105, for real-time detection of the temperature of the disinfection system, comparing the measured temperature with the preset safety threshold (70°C), and sending a signal to the Internet of Things control module 107 when the temperature exceeds the standard, triggering the protection mechanism. In this way, by setting the temperature sensor 110 downstream of the pulsed xenon lamp sterilization layer 105, a system thermal safety protection mechanism is constructed through real-time monitoring and intelligent response, in order to protect the equipment, improve the disinfection effect, and reduce costs through intelligent operation and maintenance, which is in line with the hotel scenario and is one of the core technologies for the efficient and safe operation of the closed-loop disinfection system.

[0040] The working principle of the hotel air closed-loop disinfection system of the present case is as follows: Negative pressure closed-loop drainage: The sealed negative pressure channel 101 serves as the core carrier, maintaining a static pressure environment of -30 to -50 Pa under the action of the centrifugal fan 106, so that the air in the guest room flows into the air duct through the return air inlet 11, forming a closed-loop air flow path of "guest room → air duct and its disinfection unit → air outlet 12 → guest room", and preventing the leakage of pollutants. Pretreatment purification: The air first passes through the primary efficiency filter layer (102) with a filtration precision of ≥5μm, intercepting dust, hair and other large particle impurities, avoiding contamination of the subsequent disinfection module, and reducing air resistance to ensure circulation efficiency. Multi-stage physical field synergistic disinfection: The electrostatic sterilization module 103 generates ROS free radicals through ±10-15kV needle-plate electrodes, preferentially oxidizing and destroying microbial cell membranes to achieve preliminary inactivation; The UVC array 104 has a wavelength of 265±5nm and an irradiation intensity of ≥200μW / cm², emitting deep ultraviolet light to further break the DNA / RNA chains of microorganisms and prevent their reproduction; The pulsed xenon lamp sterilization layer 105 has a spectrum of 200-1100nm and a single pulse energy density of 1.0-2.0J / cm², thereby terminally inactivating residual microorganisms through the synergistic effect of light and heat, forming a progressive disinfection chain of "oxidation → gene destruction → complete inactivation". Efficiency enhancement and guarantee mechanism: The V-shaped baffle 108 prolongs the residence time of microorganisms in the disinfection area (≥3 seconds), improving the efficiency of the physical field; the Internet of Things control module 107 is linked to the hotel PMS system to automatically trigger the disinfection process after the guest checks out. At the same time, the pressure difference sensor 109 and the temperature sensor 110 are used to monitor the resistance of the primary filter layer 102 and the channel temperature in real time. In case of abnormality, backwashing or emergency shutdown is triggered to ensure stable operation of the system. In summary, the system in Example 1 of this case, through the technical architecture of "negative pressure closed-loop drainage + multi-stage physical field progressive disinfection + intelligent monitoring and control," provides an efficient, safe, and controllable hotel air purification solution. This multi-stage coordinated disinfection mechanism addresses the weak targeting and incomplete inactivation issues of traditional single technologies, significantly improving the inactivation rate of microorganisms such as bacteria, viruses, and fungi. The sealed negative pressure design and dynamic monitoring ensure zero leakage of pollutants, eliminating the risk of cross-infection at the source. Combined with intelligent IoT linkage and low-energy design, the system adapts to complex hotel scenarios while balancing disinfection effectiveness and operating costs, providing comprehensive assurance of air hygiene and safety in hotel guest rooms.

[0041] Example 3 like Figure 3 As shown, the control method of the hotel air closed-loop disinfection system based on multi-level physical field collaboration is applied to the hotel air closed-loop disinfection system described in Example 1. Taking a 30m³ standard hotel room as an example, it includes the following steps: Step S1, real-time detection of the room status of the hotel room, when it is detected that the guest has checked out, the hotel PMS system sends a check-out cleaning instruction to the Internet of Things control module 107. If it is detected that the guest has not checked out, it is in standby mode until the room status is updated.

[0042] Step S2: The IoT control module 107 of the hotel's air closed-loop disinfection system receives the check-out cleaning instruction from the hotel's PMS system; the centrifugal fan 106 is started to maintain the static pressure value of the sealed negative pressure channel 101 at -30 to -50 Pa.

[0043] Step S3, detecting the sealing property of the sealed negative pressure channel; specifically, by using the static pressure characteristics of the sealed negative pressure air duct, the pressure retention ability of the air duct in the closed state is monitored to determine whether there is a leakage point. If the static pressure value is always stable in the range of -30 to -50 Pa without abnormal fluctuation, it is determined that the sealing property is qualified, indicating that the system sealing property is normal. If there is abnormal fluctuation, it is determined that the sealing property is unqualified, an abnormal alarm instruction is generated, and the system operation is terminated. If the sealing property is normal, the system each disinfection unit is activated in sequence.

[0044] Step S4, activating each disinfection unit of the system in sequence includes: first activating the electrostatic sterilization module 103, the working voltage is set to ±10-15kV to generate ROS free radicals; after a delay of 2 seconds, starting the UVC array 104, the wavelength is set to 265±5nm, and the irradiation intensity is set to u≥200μW / cm²; then, triggering the pulsed xenon lamp sterilization layer 105; Step S5, after each unit is activated in turn, the running time T of the system is used for disinfection of the hotel room.

[0045] Further, the running time T is obtained by a running time calculation formula: T=0.8×V(min); wherein V is the volume of the hotel room to be disinfected; according to the room volume of 30m³, the disinfection time is automatically calculated as T=0.8×30=24 minutes. The disinfection time is calculated by the formula to realize the precise dynamic regulation of “the larger the volume, the longer the time”, avoiding the waste of energy caused by too long disinfection time of small volume rooms; preventing microbial residues caused by insufficient time of large volume rooms, and ensuring that different size rooms can achieve sufficient disinfection effect.

[0046] Step S6, during the disinfection process, i.e. in the process of 24 minutes, the differential pressure sensor continuously monitors the resistance of the primary filter layer 102 to ensure normal operation of the system; specifically, when the pressure difference exceeds the preset threshold, it is determined that the resistance is abnormal, and the backwashing program is triggered or the primary filter layer 102 is replaced.

[0047] Step S7, at the same time, during the disinfection process, the temperature sensor 110 monitors in real time, if the temperature exceeds 70℃, it is determined that the temperature is too high, the system will immediately terminate the operation, close all disinfection units, and then upload the report; if the temperature does not exceed 70℃, the system continues to run until the time reaches T, i.e. 24 minutes, the disinfection completion instruction is triggered, the system automatically closes all disinfection units, completes the disinfection process and uploads the disinfection report to the cloud, which includes disinfection time, running parameters of each unit, microbial inactivation rate, primary filter layer resistance data and temperature monitoring record.

[0048] As described above, the control method of the present case triggers the disinfection process automatically only after the guest checks out by detecting the hotel room status in real time and linking the PMS system, avoiding the invalid operation of the empty guest room or the mistaken start of the guest room, and realizing disinfection on demand. The control method from instruction receiving → fan starting → sealing detection → disinfection unit activation → temperature detection → disinfection completion according to the calculated time → uploading report full process does not need manual intervention, and is automatically executed through the Internet of Things control module 107, avoiding substandard disinfection caused by human operation errors, and ensuring the standardization and consistency of each room disinfection process. Furthermore, the setting of detecting the static pressure stability of the sealed negative pressure channel before the disinfection starts avoids the running with leakage from the source, ensures the disinfection quality, and ensures the sufficient contact of the disinfection unit and microorganisms. In addition, by limiting the disinfection sequence according to the activation of the electrostatic sterilization module → UVC array → pulsed xenon lamp sterilization layer, the multi-level physical field synergistic effect is realized, the progressive disinfection chain is formed, and the disinfection effect is improved. Moreover, the resistance of the primary filter layer 102 is continuously monitored by the differential pressure sensor during the disinfection process, so that the clogging of the primary filter layer 102 (such as triggering backwashing when the resistance exceeds 1.5 times the initial value) can be found in time, avoiding the decrease of airflow velocity and the insufficient microorganism retention time caused by clogging, and ensuring the effective action of UVC irradiation and pulsed xenon lamp sterilization layer light and heat effect. Further, the temperature sensor monitors the downstream temperature of the pulsed xenon lamp in real time, and when the temperature exceeds 70°C, the operation is immediately terminated and the disinfection unit is closed, realizing over-temperature protection and reducing safety risks. Finally, the setting of automatically uploading the report containing the microorganism inactivation rate and operation parameters to the cloud after disinfection is completed facilitates the visualized supervision and traceability of the disinfection effect of the hotel operator, ensures that the room is put into use after the room hygiene meets the standard, and forms a complete closed loop of “disinfection - recording - traceability”.

[0049] In summary, the control method of the second embodiment of the present case converts the technical advantages of the multi-level physical field synergy, negative pressure sealing, intelligent control, etc. of the hardware system into “high-efficiency inactivation, safe and reliable, and operation adaptation” in actual operation through the full process design of “intelligent triggering → safety pre-checking → hierarchical disinfection → dynamic monitoring → data traceability”, perfectly solves the core pain points of “manual dependence, unstable effect, and high safety risk” in hotel air disinfection, and provides a closed-loop disinfection solution that can be implemented and supervised for hotels.

[0050] Based on the above, the application discloses a hotel air closed-loop disinfection system and control method based on multi-stage physical field cooperation, relating to the technical field of air purification. The system includes a sealed negative pressure channel, which is provided with an initial filter layer, an electrostatic sterilization module, a UVC array, and a pulsed xenon lamp sterilization layer in sequence along the airflow direction. A centrifugal fan is used to maintain a negative pressure environment of -30 to -50 Pa, forming a closed-loop airflow path. The electrostatic module inactivates microorganisms through ROS free radical oxidation, the UVC array breaks its DNA / RNA chain, and the pulsed xenon lamp realizes terminal disinfection through light-heat cooperation. The three-stage cooperation forms an action chain of "oxidation → gene damage → complete inactivation". The system also includes a V-shaped baffle to prolong the residence time, a differential pressure sensor to monitor filter resistance and trigger backwashing, a temperature sensor for over-temperature protection, and an Internet of Things control module to automatically trigger disinfection in conjunction with the hotel PMS system. The control method realizes intelligent operation through room state detection, negative pressure establishment, sealing detection, graded activation, dynamic time length control, and real-time monitoring. The application solves the problems of low safety and efficiency, high dependence on manual operation of traditional disinfection, and has the characteristics of high inactivation rate, no leakage risk, and intelligent energy saving, which is suitable for hotel scene requirements.

[0051] The above describes the hotel air closed-loop disinfection system and control method based on multi-stage physical field cooperation in detail. This article applies specific examples to explain the principles and implementation methods of the application. The above examples are only used to help understand the method and core idea of the application. For those skilled in the art, the specific implementation methods and application scope can be changed according to the idea of the application. In summary, the content of this specification should not be understood as a limitation of the application.

Claims

1. Hotel air closed-loop disinfection system based on multi-level physical field collaboration, including: A disinfection system (1), characterized in that the disinfection system (1) comprises: a sealed negative pressure channel (101), which is provided with a return air port (11) and an air outlet (12) along the air flow input and output directions; The sealed negative pressure channel (101) is provided with the following components in sequence along the airflow direction: A primary filter layer (102) is provided at the return air port (11) of the sealed negative pressure channel (101); An electrostatic sterilization module (103) is used for oxidative inactivation of microorganisms; UVC array (104), used to destroy the microbial structure through irradiation to achieve secondary deep inactivation; The pulse xenon lamp sterilization layer (105) is used to perform photothermal synergistic inactivation on the microorganisms remaining after the first two stages of treatment, thereby achieving terminal sterilization; The disinfecting system also includes: A centrifugal fan (106) is provided in the sealed negative pressure channel (101) and is used to achieve an air extraction function to maintain a negative pressure state in the sealed negative pressure channel (101); The Internet of Things control module (107) is linked to the hotel PMS system to trigger disinfection.

2. The hotel air closed-loop disinfection system according to claim 1 is characterized in that: The primary filter layer (102) has a filtration accuracy of ≥5μm; the electrostatic sterilization module (103) is provided with a needle-plate electrode, and the operating voltage is ±10-15kV; the UVC array (104) is a deep ultraviolet UVC array, the wavelength of which is 265±5nm, and the irradiation intensity is ≥200μW / cm²; the pulse xenon lamp sterilization layer (105) has a spectral range of 200-1100nm, and a single pulse energy density of 1.0-2.0J / cm².

3. The hotel air closed-loop disinfection system according to claim 1 is characterized in that: The disinfection system further comprises a V-shaped baffle (108) arranged in the sealed negative pressure channel (101); the V-shaped baffle (108) is arranged behind the UVC array (104) along the airflow direction.

4. The hotel air closed-loop disinfection system according to claim 1 is characterized in that: The disinfection system further comprises a differential pressure sensor (109) disposed in the sealed negative pressure channel (101) for real-time monitoring of the resistance of the primary filter layer (102) and automatically triggering a backwashing procedure via the Internet of Things control module (107).

5. The hotel air closed-loop disinfection system according to claim 1 is characterized in that: The electrode surface of the electrostatic sterilization module (103) is provided with a TiO2 nano-coating.

6. The hotel air closed-loop disinfection system according to claim 1 is characterized in that: The disinfection system further comprises a temperature sensor (110) disposed in the sealed negative pressure channel (101) and installed downstream of the pulse xenon lamp sterilization layer (105), for detecting the temperature of the disinfection system in real time.

7. A control method for a hotel air closed-loop disinfection system based on multi-level physical field collaboration is characterized in that: The hotel air closed-loop disinfection system according to any one of claims 1 to 6 comprises the following steps: Step S1: Real-time detection of the hotel room status. If it is detected that the guest has checked out, the hotel PMS system sends a check-out cleaning instruction to the Internet of Things control module (107); if it is detected that the guest has not checked out, the system is in standby mode until the room status is updated; Step S2: After receiving the check-out cleaning instruction, the Internet of Things control module (107) starts the centrifugal fan (106) to maintain the static pressure value of the sealed negative pressure channel (101) at a preset negative pressure threshold; Step S3, monitoring the static pressure stability of the sealed negative pressure channel (101) to determine whether the sealing is normal; if abnormal, generating an abnormal alarm instruction and terminating the operation; if normal, executing the next step; Step S4, starting the electrostatic sterilization module (103), the UVC array (104) and the pulsed xenon lamp sterilization layer (105) in a preset order; Step S5: Calculate the disinfection time T based on the volume of the guest room, and control each disinfection unit to continue running for the duration T to perform disinfection.

8. The control method according to claim 7, characterized in that: Also includes the steps: Step S6: Continuously detect the pressure difference before and after the primary filter layer (102) through the pressure difference sensor (109); when the pressure difference exceeds a preset threshold, the resistance is determined to be abnormal, triggering a backwashing procedure or prompting to replace the primary filter layer (102).

9. The control method according to claim 8, characterized in that: Also includes the steps: Step S7: Continuously collect temperature data through a temperature sensor (110) installed downstream of the pulse xenon lamp sterilization layer (105). When the temperature exceeds 70°C, immediately terminate the operation and shut down all disinfection units.

10. The control method according to claim 9, characterized in that: Also includes the steps: Step S8: If no exceptions are triggered in steps S6 and S7, after running for a time period T, a disinfection completion instruction is generated and all disinfection units are automatically shut down, and a disinfection report is uploaded to the cloud; where T = 0.8 × V (min); V is the volume of the disinfected hotel room.

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