CN111380917A - Air quality monitoring sensor and monitoring system based on nanofiber membrane - Google Patents
Air quality monitoring sensor and monitoring system based on nanofiber membrane Download PDFInfo
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Abstract
The invention relates to an air quality monitoring sensor based on a nanofiber membrane, which at least comprises at least one silver-containing nanofiber membrane (110), a performance monitoring module (120) and a data processing module (130), wherein the performance monitoring module (120) is connected with the silver-containing nanofiber membrane (110) and sends electrical performance parameters of the silver-containing nanofiber membrane (110) to the data processing module (130) in a wired and/or wireless mode so as to form at least one electrical performance parameter change curve related to working state parameters of the silver-containing nanofiber membrane (110), and in the case of applying voltage to the silver-containing nanofiber membrane (110), the data processing module (130) evaluates the air quality based on the working state parameters of the corresponding silver-containing nanofiber membrane (110) determined by the electrical performance parameter change curve. The invention can realize the sterilization of air and monitor the air quality by monitoring the silver loss degree of the silver nanofiber membrane.
Description
Technical Field
The invention relates to the field of air quality monitoring, in particular to an air quality sensor and an air quality monitoring system of a nanofiber membrane.
Background
The nanofiber material has the advantage of high-efficiency filtration. Under the situation that the current air pollution causes great harm to human health, the nanofiber material is applied to the fields of dust emission filtration, automobile exhaust emission filtration, haze masks and the like.
The infectious outbreak of the new coronavirus (COVID-19) at the end of 2019 pushed the importance of hygiene and environmental protection to the unprecedented level. How to protect the public from the aspects of sanitation and environment becomes an important issue of upper and lower focus of the whole society. The transmission pathway of the new coronavirus includes aerosol transmission. In the case of poor air circulation, the air conditioning ventilation system in the building further promotes the spread of viruses. For example, at the end of 1 month, 6 thousands of people are isolated at home due to the occurrence of cases in the Tianjin Diwu department building; day 1 month and 30, the first case appeared in the Japanese "diamond princess" number cruise ship, and 700 cases were confirmed so far; on day 3 and 4, the "honor princess" postal wheel in the united states presented the first new case of coronary death, and 21 cases were confirmed to date. The above and many similar examples indicate that central air conditioning and ventilation systems are important routes to new crown propagation. For this reason, the state department, who was 12 days as early as 2 months, issued a "guide for managing the operation of air-conditioning ventilation systems in office and public places during the epidemic period of new coronary pneumonia" (hereinafter referred to as "management guide") by the comprehensive group of joint defense mechanism for epidemic situation of new coronary pneumonia, which pointed out: the fresh air collecting port and the surrounding environment thereof must be cleaned, so as to ensure that the fresh air is not polluted; for places such as malls and office buildings where people flow greatly, the indoor comprehensive ventilation and air exchange can be ensured no matter whether the air conditioning system is used and operated; the conventional cleaning and disinfection of the air-conditioning ventilation system should meet the requirement of the cleaning and disinfection Specification of the centralized air-conditioning ventilation system of public places (WS/T396-2012). However, the current personnel have the difficulty of operation without quantitative technical indexes; if the situation happens, the ventilation system is not necessarily a good choice to be closed, because the interiors of office buildings and shopping malls are very complicated at present, and the problem of air turbidity inside the places still cannot be solved by windowing and ventilation; the spread of harmful gas and virus can not be avoided from the source, and only the ventilation system can be disinfected afterwards, so that the time cost is very high.
For example, chinese patent CN110075815A discloses a novel haze efficient filtering silver nanowire mesh and MOFs composite porous fiber thin film material and a preparation method thereof. This patent has been proposed in the specification through applying a less voltage, utilizes the long-range electrostatic force of silver nano wire to collect the particulate matter, promotes the filter effect, utilizes the function of disinfecting of silver nano wire itself moreover, realizes the effect of multi-functional filtration haze. That is, current prior art stops and uses the silver nano wire to remove the haze antibiotic, but can't confirm the filtration state and the filtration quality of silver nano wire, can't judge the life who is used for filtered air's silver nano wire net even. Under the condition of silver nanowire congestion or sterilization function failure, obviously, sterilization cannot be realized in the air, and virus propagation cannot be avoided. Therefore, how to monitor the air filtering quality in the air conditioning system and timely replace the nanofiber material ensures the stability of the air quality, which is a technical problem that cannot be solved in the prior art.
Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, since the inventor has studied a lot of documents and patents when making the present invention, but the space is not limited to the details and contents listed in the above, however, the present invention is by no means free of the features of the prior art, but the present invention has been provided with all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.
Disclosure of Invention
In view of the deficiencies of the prior art, the present invention provides an air quality monitoring sensor based on a nanofiber membrane, which is characterized in that the air quality monitoring sensor at least comprises at least one silver-containing nanofiber membrane, a performance monitoring module and a data processing module, wherein the performance monitoring module is connected with the silver-containing nanofiber membrane and sends electrical performance parameters of the silver-containing nanofiber membrane to the data processing module in a wired and/or wireless manner so as to form at least one electrical performance parameter variation curve related to operating state parameters of the silver-containing nanofiber membrane, and in the case of applying a voltage to the silver-containing nanofiber membrane, the data processing module evaluates air quality based on the operating state parameters of the silver-containing nanofiber membrane determined by the electrical performance parameter variation curve. Aiming at the problems that the air quality filtered by the nanofiber membrane cannot be monitored and the service life cannot be predicted in the prior art, the method monitors the electrical property parameters of the silver nanofiber membrane, and monitors and determines the silver loss of the silver nanofiber membrane based on the change of the electrical property parameters, so that the air quality of the air filtered by the silver nanofiber membrane is evaluated.
For the skin effect characteristic of the electrical conductor under the condition of applying alternating current, under the condition of applying alternating voltage to the silver-containing nanofiber membrane, the data processing module determines an oxidation degree parameter and/or a cleanliness degree parameter of the silver-containing nanofiber membrane relevant to evaluating the filtering capacity based on the curve change of at least one electrical property parameter and/or electromagnetic induction parameter relevant to the skin effect. Based on the skin effect, the silver conductor in the nanofiber membrane can realize the conduction of a hollow structure, so that the quality of the nanofiber membrane is reduced, and the monitoring difficulty of vibration parameters is reduced. The air quality monitoring effect of the silver-containing nanofiber membrane is ensured under the condition of reducing the manufacturing cost. Compared with direct current voltage, the alternating current applied voltage has the advantages that the direct current is unidirectional, the anode and the cathode cannot be interchanged, and the electrical performance parameters are easy to cause inaccurate data due to larger data errors in the test mode and the test direction. The alternating current at two ends of the alternating voltage is periodically changed along with time in magnitude and direction, and the alternating current has no positive and negative electrodes, so that the defect of inaccurate electrical property parameter measurement under the condition of unidirectional current is avoided. By adopting alternating voltage, the power supply can be easily connected in daily life, the measured electrical performance parameters are accurate under the condition of current change, and larger data errors are not easy to be generated due to interference of objective test conditions. The alternating current can also generate an inductor and a capacitor, and a measurement mode of the electrical property parameters can be satisfied, so that the measurement of the electrical property parameters is easier to match and adapt to the use environment, and errors and interference caused by matching are further reduced. Particularly, compared with the silver nanowire with a hollow structure, the capacitance voltage of the hollow structure is more stable and is less interfered by impurities with oxidation degree when the alternating voltage is used for measurement. Compared with the silver nanowire with a hollow structure, the direct-current voltage has larger current instability, and the obtained electrical property parameters are inaccurate and high. Preferably, the alternating voltage range of the silver nanofiber membrane is 2-20V, so that the measurement of the idle parameter change formed by the silver oxidation degree is facilitated, and the sensitivity is high.
Based on the characteristics that the current, the voltage and the resistance are uniformly distributed in the conductor under the condition of direct current voltage, the electrical property parameters are more stable and easier to monitor. The data processing module determines an oxidation degree parameter and/or a cleanliness degree parameter of the silver-containing nanofiber membrane based on at least one electrical property parameter monitored by the performance monitoring module and a curve change thereof under the condition that the silver-containing nanofiber membrane applies a direct current voltage. In the case of silver oxidation, there is a certain correlation between the degree of silver oxidation and the electrical performance parameter. According to the invention, the silver oxidation degree parameter and/or the cleanliness degree parameter are/is determined through the correlation between the silver oxidation degree and the electrical property parameter, so that the sterilization efficiency parameter of the silver-containing nanofiber membrane can be evaluated, and the air quality after filtration is further determined.
Based on the flexibility of arrangement of the silver-containing nanofiber membrane, the air quality monitoring sensor further comprises at least one filtering component, a dehumidifying component and/or a speed regulating component arranged upstream or downstream of the air flow of the silver-containing nanofiber membrane. The advantage of so setting up is favorable to reducing the oxidation loss of silver ion or silver nano wire, prolongs the life who contains silver nanofiber membrane. When the skin effect parameters of the silver-containing nanofiber membrane are evaluated, the air humidity has a large influence on parameter fluctuation. Therefore, accurate judgment of the humidity, especially the humidity of the surface of the silver-containing nanofiber membrane, is a technical challenge with high precision. For this reason, the present invention is provided with a forced dehumidifying element which may be interposed as required immediately upstream of the silver-containing nanofiber membrane in the air flow path, in addition to the conventional dehumidifying element provided upstream or downstream of the air flow. The forced dehumidification component can be realized by means of an air conditioning refrigeration cycle, for example, and can not only be periodically inserted into the upstream airflow of the silver-containing nanofiber membrane for eliminating accumulated moisture on the fiber membrane so as to prolong the service life of the fiber membrane; and when at least one working state parameter shows that the service life of the silver-containing nanofiber membrane is about to reach or is expired in a sudden change mode, the forced dehumidification component is intervened at higher working power, so that the silver-containing nanofiber membrane is subjected to secondary monitoring under the condition of obviously drying, and the interference caused by moisture is eliminated more accurately.
The performance monitoring module at least comprises a vibration monitoring component for monitoring vibration parameters of the silver-containing nanofiber membrane, and under the condition that the silver-containing nanofiber membrane is in a working state, the data processing module evaluates the cleanliness parameter and/or the wind resistance parameter of the silver-containing nanofiber membrane based on the vibration parameters sent by the vibration monitoring component. The invention can form the cleanliness parameter estimated by the vibration parameter and the cleanliness parameter determined by the electrical property parameter into mutual reference data, and monitor and correct the performance monitoring module under the condition of larger difference between the two data, thereby being beneficial to finding out the fault of the performance monitoring module and maintaining in time and ensuring the normal operation of the air quality monitoring sensor.
The silver-containing nanofiber membrane is a nanofiber membrane attached with silver ions and/or silver nanowires. The silver nanowires in the silver-containing nanofiber membrane comprise nano silver wires with hollow structures and silver nanowires with non-hollow structures. The arrangement of the silver nanowires with the hollow structures is more beneficial to generating vibration while reducing the quality of the silver-containing nanofiber membrane, so that the vibration parameters are easier to monitor. The silver ion and the silver nano wire have better sterilization efficiency.
Preferably, the silver-containing nanofiber membrane has a pore size range of not more than 0.1 micron. The pore size of less than 0.1 micron is beneficial to filtering viruses with the particle size of 0.1-0.3 micron, such as new coronavirus. Therefore, the invention has better virus sterilization effect and high air quality, and can ensure the health of human body.
The invention also provides an air quality monitoring system, which comprises at least one air quality monitoring sensor and a display device, wherein the at least one air quality monitoring sensor is arranged in the ventilation pipeline or the air inlet/outlet. The air quality monitoring sensor at least comprises at least one silver-containing nanofiber membrane, a performance monitoring module and a data processing module. Wherein the performance monitoring module is connected with the silver-containing nanofiber membrane and transmits the electrical performance parameters of the silver-containing nanofiber membrane to the data processing module in a wired and/or wireless mode so as to form at least one electrical performance parameter change curve related to the working state parameters of the silver-containing nanofiber membrane. Under the condition that the silver-containing nanofiber membrane applies voltage, the data processing module evaluates the air quality based on the working state parameter of the corresponding silver-containing nanofiber membrane determined by the electrical property parameter change curve. The air quality monitoring system of the invention can effectively sterilize air while adjusting air, and particularly can filter and kill viruses, so that the filtered air quality does not contain dust and viruses, and healthy air quality is realized. Furthermore, the invention monitors the sterilization efficiency by monitoring the loss of the silver-containing nanofiber membrane, thereby realizing the supervision of the air quality.
An air quality monitoring system, wherein the data processing module determines an oxidation degree parameter and/or a cleanliness degree parameter of the silver-containing nanofiber membrane related to evaluating filtering capacity based on curve change of at least one electrical property parameter and/or electromagnetic induction parameter related to skin effect under the condition that the silver-containing nanofiber membrane applies alternating voltage. The air quality monitoring system adopts a hollow structure or silver-plated silver nanowires according to the characteristics of the skin effect, so that the quality of the nanofiber membrane is reduced, and the monitoring difficulty of vibration parameters is reduced. The air quality monitoring effect of the silver-containing nanofiber membrane is ensured under the condition of reducing the manufacturing cost.
Drawings
Fig. 1 is a schematic diagram of the basic structure of an air quality monitoring sensor of the present invention.
List of reference numerals
110: a silver-containing nanofiber membrane; 120: a performance monitoring module; 130: and a data processing module.
Detailed Description
The following detailed description is made with reference to the accompanying drawings.
The skin effect in the invention is also called skin effect, when alternating current passes through a conductor, the current is concentrated on the surface of the conductor to flow. When electrons with high frequency are conducted in a conductor, the electrons collect on the surface of the conductor rather than evenly distributed in the cross-sectional area of the whole conductor. For example, in a direct current circuit, the current density is uniform over a uniform conductor cross-section. However, when an alternating current passes through a conductor, the current distribution over the cross-section of the conductor is more and more concentrated towards the surface of the conductor as the frequency increases, so that the small bulb connected to the surface of the conductor is much brighter than the small bulb connected to the middle of the conductor, a phenomenon known as the skin effect.
Therefore, under the condition that alternating current flows at two ends of the silver-containing nanofiber membrane, the electrical property parameters related to the skin effect and the change of the electrical property parameters can be monitored. The silver nanowires in the silver-containing nanofiber membrane are arranged into a hollow structure, and the conductivity of the silver nanowires is not influenced. Under the condition that direct current flows at two ends of the silver-containing nanofiber membrane, the electrical property parameters of silver nanowires or silver ions in the silver-containing nanofiber membrane can be tested through the circuit couple, namely the related component.
The electrical property parameters of the invention include not only resistance, current, voltage, magnetic flux related to electromagnetic induction, and magnetic induction intensity, but also any parameter calculated based on the resistance, current, voltage, magnetic flux, and magnetic induction intensity.
The performance monitoring module 120 in the present invention refers to a circuit, an integrated circuit, or a component capable of directly calculating the required electrical performance parameter of the silver-containing nanofiber membrane 110, such as a current testing component, a voltage testing component, a resistance testing component, a magnetic flux, a magnetic induction intensity testing component, and so on.
The air quality monitoring sensor based on the nanofiber membrane can also be an air conditioning system and equipment, an air quality monitoring system and equipment, an evaluation/prediction device and system of the loss state of the nanofiber membrane, an evaluation device and system of the service life of the nanofiber membrane, or an air conditioning management system based on the nanofiber membrane.
In the silver-containing nanofiber membrane of the present invention, the conductive body is silver. On one hand, the silver surface can easily generate monovalent silver ions Ag when meeting water+On the other hand, the silver oxide AgO is easily oxidized in the air to generate silver oxide AgO, and under the action of water, the silver oxide is hydrolyzed to generate divalent silver ions Ag2+And hydroxyl. The two silver ions can be rapidly combined with enzyme protein in the thallus, so that the enzyme loses activity and the metabolism process of biomolecules is destroyed. After the reaction, a part of silver ions are dissociated from dead bacteria and continue to be sterilized, and meanwhile, a part of silver ions are remained in the dead bacteria and exist in the form of a silver-biomolecule compound. With the continuous contact with the thallus, the silver ions are continuously lost, so the reaction of silver oxidized into silver ions is continuously carried out to realize chemical equilibrium, and the silver content is reduced. Since the conductive main body in the nanofiber membrane is silver, the conductivity of the nanofiber membrane tends to be gradually reduced along with the increase of the oxidation degree of silver and the gradual reduction of the content of silver, and the sterilization efficiency also tends to be reduced. Thus, several tests have been performed to obtain a relationship between electrical performance parameters and the degree of silver oxidation. The degree of silver oxidation can also reflect the degree of silver loss. The silver oxidation degree and the sterilization efficiency have a correlation relationship, and the correlation coefficient can be obtained through testing.
The silver nanowires in the silver-containing nanofiber membrane 110 of the present invention include silver nanowires having a hollow structure and/or silver nanowires having a non-hollow structure. The silver nanowire with the hollow structure is beneficial to obtaining relevant electrical performance parameters of the silver-containing nanofiber membrane according to the skin effect principle under the condition that alternating current passes through, and is beneficial to saving the use of silver materials. The cavity of the silver nanowire with the hollow structure can be filled with conductive materials or non-conductive materials with other structures according to requirements. Or, the silver ions are attached to the silver-containing nanofiber membrane 110, and the silver ions can kill most of bacteria and viruses to play a role in sterilization.
Preferably, the silver ions or silver nanowires in the silver-containing nanofiber membrane can be arranged according to a certain proportion. Silver ions or silver nanowires in the silver-containing nanofiber membrane can coexist, and the ratio of the silver ions to the silver nanowires can be set as required. The advantage of so setting up lies in, through adjusting the ratio of silver ion or silver nano wire, can construct different filtration index and bactericidal index contain silver nanofiber membrane or air quality monitoring sensor, construct the silver nanofiber membrane that contains of different life promptly, and then apply to different air conditioning places. For example, the silver-containing nanofiber membrane is suitable for air quality monitoring sensors composed of silver-ion or silver-nanowire films with high proportion and long service life for intensive places such as hospitals, subways, office buildings, hotels, malls and the like with high air pollution or high virus content. The silver-containing nanofiber membrane is used for an air quality monitoring sensor composed of a silver ion or silver nanowire film with a low proportion and a general service life in a household environment with less air pollution and less dust, or a classroom and a conference room.
Preferably, the pore size of the silver-containing nanofiber membrane 110 can be controlled in a wide range by preparing individual fibers of different diameters. For example, the diameter of silver nanowires can be as low as 50 nanometers 0.05 microns, and nanofiber membranes made from silver nanowires of this diameter can have pore sizes below 0.1 microns, enabling filtration of fine particulate matter from 0.1 to 0.3 microns. I.e., the pore size range of the silver-containing nanofiber membrane 110 is not greater than 0.1 μm. This arrangement has the advantage that a sufficiently small pore size is effective in blocking fine particulate matter of approximately 0.1-0.3 microns in diameter. The fine particles comprise dust and virus particles, and realize the function of virus filtration.
Therefore, the silver-containing nanofiber membrane can detect fine particles such as viruses and bacteria in the air, and the sterilization index and the filtration index of the silver-containing nanofiber membrane to the air are determined according to the silver oxidation degree or the loss degree of the viruses to the silver nanowires. The higher the bactericidal index and filtration index, the higher the air quality index through the silver-containing nanofiber membrane. Therefore, the invention monitors the air quality by monitoring the working state of the silver nanofiber membrane.
Further, sulfur dioxide and nitrogen dioxide present in the air easily react in the air and combine with fine particles to form acidic fumes such as sulfuric acid fumes, photochemical fumes, and the like. After the acid smoke passes through the silver-containing nanofiber membrane, silver is easily oxidized, and then the conductivity of the membrane is reduced. By detecting the change of the electrical property coefficient of the silver-containing nanofiber membrane in a certain time, the index or grade of the air quality can be evaluated.
The working state parameters of the silver-containing nanofiber membrane at least comprise an oxidation degree parameter, a filtering parameter, a wind resistance parameter, a cleaning degree parameter, a vibration parameter and the like.
Example 1
The invention provides an air quality monitoring sensor based on a nanofiber membrane. As shown in fig. 1, the air quality monitoring sensor includes at least one silver-containing nanofiber membrane 110, a performance monitoring module 120, and a data processing module 130. Wherein the performance monitoring module 120 is connected to the silver-containing nanofiber membrane 110 to monitor at least one electrical performance parameter of the silver-containing nanofiber membrane 110. Preferably, the electrical property parameter may be a time-dependent electrical property parameter or a time-dependent electrical property parameter having at least two electrical property parameters.
The data processing module 130 sends the electrical property parameters of the silver-containing nanofiber membrane 110 to the data processing module 130 in a wired and/or wireless manner. The data processing module 130 forms at least one electrical property parameter change curve associated with an operating condition parameter of the silver-containing nanofiber membrane 110 based on the change in the electrical property parameter. In the case where the silver-containing nanofiber membrane 110 is applied with a voltage, the data processing module 130 estimates an air quality parameter based on an operating state parameter of the silver-containing nanofiber membrane 110 calculated from the electrical property parameter or the electrical property parameter change curve. According to the invention, through monitoring and detecting the electrical property parameters of the silver-containing nanofiber membrane, the air quality monitoring sensor can obtain the working state parameters with the correlation, so that the working state of the silver-containing nanofiber membrane is mastered, and the air quality after being filtered by the air quality monitoring sensor is evaluated according to the working state parameters. The air quality monitoring sensor of the invention can also evaluate the service life and the updating time according to the silver oxidation degree or the silver loss degree.
Preferably, under the condition that the silver oxidation index calculated by the data processing module based on the electrical property parameters sent by the property monitoring module 120 reaches the threshold value, the early warning component connected with the data processing module performs replacement early warning prompt in a sound, light or voice mode, so that a manager can replace the silver-containing nanofiber membrane in the air quality monitoring sensor, and the air quality in the air conditioning system is ensured.
Preferably, in the case that the silver-containing nanofiber membrane 110 is applied with a voltage by an alternating current power supply, the data processing module 130 determines the degree of oxidation and/or the degree of cleanliness of the silver-containing nanofiber membrane 110 based on a curve change of at least one electrical property parameter and/or electromagnetic induction parameter related to the skin effect. The electrical performance parameters of the silver nanowires in the silver-containing nanofiber membrane 110 in the skin effect are also related to the degree of silver oxidation at a stable voltage. Under the condition that the silver nanowires are silver-plated nanowires, silver loss degree parameters or silver oxidation degree parameters can be calculated through changes of silver electrical performance parameters on the surfaces of the silver-plated nanowires, and therefore air quality is monitored. The advantages of monitoring the air quality based on the electrical performance parameters of the skin effect of the silver-plated nanowires are that, firstly, the silver content of the silver-plated nanowires is low, and the cost is low; second, the interior material of the silver-plated nanowires can impart new functions. Preferably, the silver-containing nanofiber membrane 110 has a hollow structure, and also has advantages of less silver loss and light weight.
Furthermore, the silver-containing nanofiber membrane with a hollow structure has the advantage that the silver-containing nanofiber membrane is easier to generate membrane resonance when filtering flowing air due to the advantage of light weight. The service life of the silver-containing nanofiber membrane comprises the rise of wind resistance parameters caused by filtering dust and germs, and also comprises the change of silver loss degree parameters and film conductivity parameters in the sterilization process. Under the condition that the silver-containing nanofiber membrane is lighter in weight, resonance parameters are easier to monitor, and therefore the difficulty in representing the cleanliness degree and the wind resistance parameters through monitoring the shift of the film resonance peak is lower.
Preferably, the data processing module 130 determines the degree of oxidation and/or degree of cleanliness of the silver-containing nanofiber membrane 110 in relation to evaluating air quality or filtering capacity based on the correlation between the electrical property parameter variation curve related to the skin effect and the silver oxidation degree parameter or the degree of cleanliness parameter. Under the condition that the proportion of silver ions or silver nanowires of the silver-containing nanofiber membrane is determined, the initial electrical property parameter of the electric conduction is determined. Through multiple tests and calibrations, the corresponding relation between the electrical property parameters and the sterilization efficiency parameters and the cleaning degree parameters can be obtained. Based on the correspondence, after obtaining the electrical property parameters of the silver-containing nanofiber membrane, the degree of oxidation and/or the degree of cleanliness of the silver-containing nanofiber membrane 110 relevant to the evaluation of air quality or filtering capability can be determined. The air quality monitoring sensor can accurately monitor and control the air quality after the filtration of the silver-containing nanofiber membrane according to accurate monitoring data, and even can detect the air quality of a specified air conditioning system within a certain time, so that dust, bacteria and viruses in an air pollution area are purified, and the health of a human body is protected.
Preferably, under the condition that the silver-containing nanofiber membrane 110 is applied with voltage by a direct current power supply, the data processing module determines the sterilization efficiency, the cleanliness degree and the replacement time of the silver-containing nanofiber membrane based on the change of the electrical property parameter curve of the silver ions or the silver nanowires set according to a certain ratio. Specifically, a current of silver ions or silver nanowires having a conductive property flows through both the center and the surface of the conductor. Therefore, the resistance, current and voltage of the silver nanowires can be directly measured, and other electrical property parameters related to the resistance, current and voltage can also be obtained. Through the measurement of electrical property parameters such as resistance, the corresponding relation between the resistance change and the sterilization efficiency parameter and the corresponding relation between the resistance change and the cleanness degree are tested and calibrated, and the time for replacing the silver-containing nanofiber membrane can be determined according to the resistance value change.
Preferably, the air quality monitoring sensor further comprises at least one filtering component, a dehumidifying component and/or a speed regulating component disposed upstream or downstream of the air flow of the silver-containing nanofiber membrane 110. For example, two ends of the silver-containing nanofiber membrane are respectively provided with a coarse filter membrane, large particle dust is subjected to primary filtration, the speed of reducing the silver oxidation degree is favorably reduced, the service life of the silver-containing nanofiber membrane is prolonged, and the monitoring time of the air quality monitoring sensor is prolonged.
Preferably, the performance monitoring module 120 further comprises at least a vibration monitoring component for monitoring a vibration parameter of the silver-containing nanofiber membrane 110. With the silver-containing nanofiber membrane 110 in the operating state, the data processing module 130 evaluates the cleanliness parameter and/or the wind resistance parameter of the silver-containing nanofiber membrane 110 based on the vibration parameter sent by the vibration monitoring component. Preferably, the second degree of cleanliness parameter of the silver-containing nanofiber membrane 110 obtained by the vibration parameter of resonance can be used as the reference data of the first degree of cleanliness parameter determined by the electrical property parameter. Under the condition that the difference value of the first cleanliness parameter and the second cleanliness parameter exceeds the set threshold value, the data processing module reselects the electrical property parameter to determine the numerical value of the first cleanliness parameter, so that the accuracy of monitoring data is guaranteed, and the accuracy and the sensitivity of the air quality monitoring sensor are improved.
Example 2
The invention provides an air quality monitoring system. The air quality monitoring system of the present invention includes at least the air quality monitoring sensor provided with the silver-containing nanofiber membrane 110. Preferably, the air quality monitoring sensor is provided in an air duct, an air outlet or an air inlet of the air conditioning system.
Preferably, in the air quality monitoring system, the air quality monitoring sensor is connected with the video monitoring device and the power monitoring device in a data transmission mode so as to collect and visualize data in the central control system.
The air quality monitoring sensor comprises at least one silver-containing nanofiber membrane 110, a performance monitoring module 120 and a data processing module 130. The performance monitoring module 120 is connected to the silver-containing nanofiber membrane 110 and transmits the skin effect parameters of the silver-containing nanofiber membrane 110 to the data processing module 130 in a wired and/or wireless manner so as to form at least one skin effect parameter variation curve related to the operating state parameters of the silver-containing nanofiber membrane 110. In the case where the silver-containing nanofiber membrane 110 applies a voltage, the data processing module 130 calculates an operating state parameter of the silver-containing nanofiber membrane 110 based on the skin effect parameter variation curve.
Preferably, the data processing module 130 determines the oxidation degree and/or the cleanliness degree of the silver-containing nanofiber membrane 110 related to the evaluation of the filtering capability based on the correlation between the skin effect parameter variation curve and the silver oxidation degree parameter or the cleanliness degree parameter.
By monitoring the air quality in the building, the invention can comprehensively manage the air, the safety image and the electric power in the building, ensure the air quality in the building and improve the life quality in the building.
It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents.
Claims (10)
1. An air quality monitoring sensor based on nanofiber membranes, characterized in that the air quality monitoring sensor comprises at least one silver-containing nanofiber membrane (110), a performance monitoring module (120) and a data processing module (130), wherein,
the performance monitoring module (120) is connected with the silver-containing nanofiber membrane (110) and sends the electrical performance parameters of the silver-containing nanofiber membrane (110) to the data processing module (130) in a wired and/or wireless mode so as to form at least one electrical performance parameter change curve related to the working state parameters of the silver-containing nanofiber membrane (110),
in the case where the silver-containing nanofiber membrane (110) is applied with a voltage, the data processing module (130) evaluates the air quality based on the determination of the operating state parameter of the corresponding silver-containing nanofiber membrane (110) from the electrical property parameter change curve.
2. The nanofiber membrane-based air quality monitoring sensor according to claim 1, wherein, in the case where an alternating voltage is applied to the silver-containing nanofiber membrane (110),
the data processing module (130) determines an oxidation degree parameter and/or a cleanliness degree parameter of the silver-containing nanofiber membrane (110) related to evaluating filtration capacity based on a curve change of at least one electrical property parameter and/or electromagnetic induction parameter related to skin effect.
3. The nanofiber membrane based air quality monitoring sensor according to claim 2, wherein the data processing module (130) determines the oxidation degree parameter and/or the cleanliness degree parameter of the silver-containing nanofiber membrane (110) based on at least one electrical property parameter monitored by the performance monitoring module (120) and a curve change thereof under the condition that the silver-containing nanofiber membrane (110) applies a direct current voltage.
4. The nanofiber membrane based air quality monitoring sensor of claim 3, further comprising at least one filtering component, dehumidifying component and/or speed regulating component disposed upstream or downstream of the air flow of the silver-containing nanofiber membrane (110).
5. The nanofiber membrane based air quality monitoring sensor of claim 4, wherein the performance monitoring module (120) further comprises at least a vibration monitoring component that monitors a vibration parameter of the silver-containing nanofiber membrane (110),
with the silver-containing nanofiber membrane (110) in an operating state, the data processing module (130) evaluates a cleanliness parameter and/or a wind resistance parameter of the silver-containing nanofiber membrane (110) based on the vibration parameter sent by the vibration monitoring component.
6. The nanofiber membrane based air quality monitoring sensor of one of the preceding claims,
the silver-containing nanofiber membrane (110) is a nanofiber membrane attached with silver ions and/or silver nanowires.
7. The nanofiber membrane based air quality monitoring sensor of one of the preceding claims,
the silver nanowires in the silver-containing nanofiber membrane (110) include nano silver wires having a hollow structure and silver nanowires having a non-hollow structure.
8. The nanofiber membrane based air quality monitoring sensor of one of the preceding claims,
the silver-containing nanofiber membrane (110) has a pore size range of no greater than 0.1 microns.
9. An air quality monitoring system comprises at least one air quality monitoring sensor and a display device, and is characterized in that the at least one air quality monitoring sensor is arranged in a ventilation pipeline or an air inlet/outlet, wherein,
the air quality monitoring sensor comprises at least one silver-containing nanofiber membrane (110), a performance monitoring module (120) and a data processing module (130), wherein,
the performance monitoring module (120) is connected with the silver-containing nanofiber membrane (110) and sends the electrical performance parameters of the silver-containing nanofiber membrane (110) to the data processing module (130) in a wired and/or wireless mode so as to form at least one electrical performance parameter change curve related to the working state parameters of the silver-containing nanofiber membrane (110),
in the case where the silver-containing nanofiber membrane (110) is applied with a voltage, the data processing module (130) evaluates the air quality based on the determination of the operating state parameter of the corresponding silver-containing nanofiber membrane (110) from the electrical property parameter change curve.
10. The air quality monitoring system according to claim 9, wherein, in the case where an alternating voltage is applied to the silver-containing nanofiber membrane (110),
the data processing module (130) determines an oxidation degree parameter and/or a cleanliness degree parameter of the silver-containing nanofiber membrane (110) related to evaluating filtration capacity based on a curve change of at least one electrical property parameter and/or electromagnetic induction parameter related to skin effect.
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