CN116727401A - Self-adaptive control system and method for fume hood - Google Patents

Abstract

The invention discloses a self-adaptive control system and method for a fume hood, and relates to the technical field of fume hoods. The system comprises a main control module which is in communication connection and is used for generating control instructions and detecting internal and external environments, an internal environment detection module which is used for detecting the internal environments and generating internal detection results, an external environment detection module which is used for detecting the external environments and generating external detection results, a ventilation control module which is used for ventilating according to the internal detection results and/or the external detection results, and a self-checking operation and maintenance module which is used for periodic self-checking and maintenance. According to the invention, the internal and external environments of the ventilation cabinet are detected to effectively inhibit the generation and diffusion of bacterial and viruses in the cabinet, prevent unsmooth ventilation and equipment performance damage caused by high temperature and high humidity, prevent the health of personnel from being damaged due to overhigh concentration of harmful gas and prevent air circulation from being blocked due to low air pressure, and ensure the timeliness of pollutant and harmful gas treatment; the performance of the fume hood is ensured by periodic self-inspection and maintenance of equipment in the fume hood.

Description

Self-adaptive control system and method for fume hood

Technical Field

The invention belongs to the technical field of fume hoods, and particularly relates to a fume hood self-adaptive control system and a fume hood self-adaptive control method.

Background

A fume hood is a safety device for laboratory and industrial environments that protects operators from harmful gases, chemicals and microbial contaminants; the fume hood effectively prevents harmful substances from escaping by providing a negative pressure environment and exhausting air from the working area using a ventilation device such as a fan.

Chinese patent CN114273372B provides a control system of an intelligent fume hood, which includes a detection module for detecting whether personnel exist in an experimental operation area; the acquisition module is used for starting the temperature measurement in the fume hood when personnel exist in the experimental operation area, and acquiring at intervals based on preset time to determine the inner temperature of the fume hood; the control module is used for judging whether the internal temperature of the fume hood is greater than a maximum temperature threshold value; when the internal temperature of the fume hood is greater than the maximum temperature threshold, the ventilation valve of the fume hood is adjusted to cool. The invention has the beneficial effects that: when detecting that the detection area has personnel, through the open condition of control ventilation valve and then according to real-time temperature, adjust the ventilation valve, and then realize wind-force regulation, effectively reduce the temperature of fume chamber.

The invention detects the experimental area, avoids the situation of misoperation of the ventilation system when non-experimental personnel appear, and ventilates according to the real-time temperature. Said invention can detect real-time temperature and regulate ventilation, but does not implement biological detection of fume hood, such as bacteria and microbe, etc., and can not prevent bacterial pollution; the fume hood is not subjected to gas detection, so that harmful gas cannot be prevented in time; meanwhile, the existing fume hood does not have noise and interference detection, and operators cannot be effectively guaranteed to be in a comfortable and quiet operating environment.

Disclosure of Invention

The application aims to provide a self-adaptive control system and a self-adaptive control method for a fume hood, which are used for effectively inhibiting the generation and diffusion of bacterial and viruses in the fume hood, preventing unsmooth ventilation and equipment performance damage caused by high temperature and high humidity, preventing the health of personnel from being damaged due to excessive harmful gas concentration and preventing the air circulation blocking caused by low air pressure in the fume hood by detecting the internal environment and the external environment of the fume hood, so that the timeliness of pollutant and harmful gas treatment is improved; and detecting and ventilating control are carried out aiming at different influencing factors, and self-checking and maintenance are carried out on equipment in the ventilating cabinet at regular intervals, so that the performance of the ventilating cabinet is not influenced.

The aim of the application can be achieved by the following technical scheme:

in a first aspect, an embodiment of the present application provides a self-adaptive control system for a fume hood, including a main control module, an internal environment detection module, an external environment detection module, a ventilation control module, and a self-checking operation and maintenance module;

the main control module and the ventilation control module are respectively in communication connection with the internal environment detection module and the external environment detection module; the self-checking operation and maintenance module is in communication connection with the ventilation control module;

The main control module is used for generating a control instruction and controlling the internal environment detection module and the external environment detection module to carry out environment detection;

the internal environment detection module is used for detecting the internal environment of the fume hood according to the control instruction and generating an internal detection result;

the external environment detection module is used for detecting the external environment of the fume hood according to the control instruction and generating an external detection result;

the ventilation control module is used for controlling the ventilation cabinet to ventilate according to the internal detection result and/or the external detection result;

the self-checking operation and maintenance module is used for regularly carrying out self-checking and maintenance on the fume hood;

wherein the control instruction includes an internal detection instruction and an external detection instruction.

Preferably, the internal environment detection module comprises an internal detection unit, an internal acquisition unit and an internal analysis unit which are sequentially in communication connection;

the internal detection unit is used for detecting the internal environment according to the internal detection instruction and acquiring an internal detection factor;

the internal acquisition unit is used for acquiring internal environment data of the fume hood according to the internal detection factors;

The internal analysis unit is used for analyzing the internal environment data and generating the internal detection result;

wherein the internal detection factors include microorganisms, temperature, humidity, gas and air pressure.

Preferably, if the internal detection factor is a microorganism, the analysis of the microorganism comprises the steps of:

setting a content threshold of microorganisms in the fume hood;

collecting microorganism particles in air by adopting an air sampling method;

taking the microorganism particles as a sample and adopting an analysis method to analyze the microorganism particles to determine the microorganism content;

comparing the microorganism content with the content threshold value to obtain an analysis result;

wherein the analysis method comprises one or more of a culture counting method, a molecular biological method and a protein detection method;

wherein the method of air sampling includes one or more of multipoint sampling, timing sampling and parallel sampling.

Preferably, if the internal detection factor is the temperature and the humidity, the temperature and the humidity are detected and analyzed, and one or more of a temperature and humidity sensor, a data recorder and a thermal infrared imager are adopted for detection and analysis.

Preferably, if the internal detection factor is the gas, the detection of the gas includes a gas sensor and a gas chromatograph; the gas chromatograph is used for analyzing the gas components in the fume hood to obtain harmful gases; the gas sensor is used for monitoring the concentration of harmful gas in real time.

Preferably, if the internal detection factor is the air pressure, the detection of the air pressure includes a pressure sensor and a differential pressure sensor; the pressure sensor is used for monitoring the internal air pressure of the fume hood; the differential pressure sensor is used for measuring the air pressure difference between the inside and the outside of the fume hood.

Preferably, the external environment detection module comprises an external acquisition unit, an external detection unit and an external analysis unit which are sequentially in communication connection;

the external detection unit is used for detecting the external environment according to the external detection instruction and acquiring an external detection factor;

the external acquisition unit is used for acquiring external environment data of the fume hood according to the external detection factors;

the external analysis unit is used for analyzing the external environment data and generating the external detection result;

Wherein the external detection factors include air flow rate and sound decibels;

the external detection unit comprises a sound decibel detection unit and an air flow rate detection unit which are in communication connection;

the sound detection unit is used for acquiring sound decibels when the fume hood operates and judging whether the sound decibels are noise or not;

the air flow rate detection unit is used for detecting the external air flow rate of the fume hood.

Preferably, the ventilation control module includes an internal control unit and an external control unit;

the internal control unit is used for carrying out ventilation treatment on the internal environment of the ventilation cabinet according to the internal detection result;

and the external control unit is used for carrying out ventilation treatment on the external environment of the fume hood according to the external detection result.

Preferably, the self-checking operation and maintenance module comprises an environment self-checking unit, an equipment self-checking unit and a cleaning and maintenance unit; the cleaning maintenance unit is respectively in communication connection with the environment self-checking unit and the equipment self-checking unit;

the environment self-checking unit is used for periodically performing self-checking on the internal environment and the external environment of the fume hood to generate an environment self-checking report;

the equipment self-checking unit is used for carrying out self-checking on the operation equipment of the fume hood at regular intervals to generate an equipment self-checking report;

And the cleaning and maintaining unit is used for cleaning and maintaining according to the environment self-checking report and the equipment self-checking report.

In a second aspect, an embodiment of the present application provides a method for adaptively controlling a fume hood, including the following steps:

s1, a control instruction is generated by a fume hood through a main control module; the control instruction comprises an internal detection instruction and an external detection instruction;

s2, detecting the internal environment of the fume hood according to the internal detection instruction to generate an internal detection result;

s3, detecting the external environment of the fume hood according to the external detection instruction to generate an external detection result;

s4, controlling the ventilation cabinet to ventilate according to the internal detection result and/or the external detection result;

s5, carrying out self-inspection and maintenance on the fume hood regularly;

in the step S2, the internal environment is detected according to the internal detection instruction, and an internal detection factor is obtained;

the internal detection factors include microorganisms, temperature, humidity, gas and air pressure;

in the step S3, detecting the external environment according to the external detection instruction, and obtaining an external detection factor;

the external detection factors include air flow rate and sound decibels.

The beneficial effects of the invention are as follows:

(1) According to the invention, by detecting the internal environment and the external environment of the ventilation cabinet, the generation and the diffusion of bacterial viruses in the cabinet are effectively inhibited, unsmooth ventilation and equipment performance damage caused by high temperature and high humidity are prevented, the health of personnel is prevented from being damaged due to the too high concentration of harmful gas, the air circulation blockage caused by low air pressure in the cabinet is prevented, and the timeliness of pollutant and harmful gas treatment is improved; and detecting and ventilating control are carried out aiming at different influencing factors, and self-checking and maintenance are carried out on equipment in the ventilating cabinet at regular intervals, so that the performance of the ventilating cabinet is not influenced.

(2) According to the invention, the main control module generates the control instruction, so that the internal environment detection module and the external environment detection module are respectively controlled to detect the internal environment and the external environment of the fume hood, and then the ventilation control is performed through the ventilation control module according to the detection results of the two modules, so that the ventilation performance of the fume hood is prevented from being influenced by the internal environment and/or the external environment of the fume hood, and the safety of operators and the suitability of the internal environment of the fume hood are further ensured.

(3) In the internal environment detection module, the microbial contamination caused by the too high bacterial and virus content is prevented by detecting the microbial content in the fume hood; the problems that the performance of the ventilating cabinet is affected due to high temperature and high humidity are prevented by detecting the temperature and the humidity in the cabinet, so that discomfort of operators is avoided; the harmful gas and the content thereof in the cabinet are detected, so that the environment in the cabinet is prevented from being polluted by the high-concentration harmful gas, and the health of operators is further prevented from being endangered; through detecting the internal air pressure of cabinet, prevent effectively that the leakage and the propagation of harmful substance that lead to because of the atmospheric pressure is too low to prevent to influence ventilation effect and working area's security because of the air current disturbance, the unsmooth scheduling problem of airing exhaust.

(4) In the external environment detection module, the air flow rate of the external environment of the cabinet is also detected, so that excessive diffusion of biological pollution caused by too low air flow rate is avoided, and the protection effect and the filtering efficiency of the ventilation cabinet are influenced; and the noise is divided and timely protected and processed by detecting the sound decibels, so that the situation that operators cannot be in a comfortable and quiet operating environment due to noise and interference is prevented.

(5) In the ventilation control module, the ventilation cabinet is ventilated according to the detection results of the internal environment detection and/or the external environment detection, and because the internal environment and the external environment of the ventilation cabinet have various influence factors, the ventilation control module can selectively perform ventilation control according to the detection results, and if a plurality of influence factors are detected to exist simultaneously, the module can perform ventilation control on the internal environment and the external environment of the cabinet, so that the multiple selectivity and the effectiveness of the ventilation control are ensured, and the timeliness and the high efficiency of ventilation are further ensured.

(6) In the self-checking operation and maintenance module, the self-checking of the fume hood can be carried out regularly, including but not limited to the self-checking of the internal and external environment, the operation equipment and the ventilation effect of the fume hood, and the module prevents the equipment performance and the ventilation efficiency of the fume hood from being reduced due to old and damaged fume hood ventilation equipment through regular self-checking and timely cleaning maintenance, so that the ventilation efficiency of the fume hood is further improved.

(7) According to the application, different detection methods and means are adopted in the detection of the internal environment aiming at different influencing factors such as microorganisms, temperature, humidity, gas, air pressure and the like, so that the detection result of the internal environment is more accurate and reliable, and the ventilation control module is more rapid and timely, thereby improving the ventilation efficiency.

Drawings

For a better understanding and implementation, the technical solution of the present application is described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a self-adaptive control system of a fume hood according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of an internal environment detection module according to an embodiment of the present application;

FIG. 3 is a flowchart showing the steps of analysis when the internal detection factor is a microorganism according to an embodiment of the present application;

FIG. 4 is a flowchart illustrating an analysis step when the internal detection factor is temperature and humidity according to an embodiment of the present application;

FIG. 5 is a flowchart illustrating an analysis step when the internal detection factor is gas according to an embodiment of the present application;

FIG. 6 is a flowchart illustrating an analysis step when the internal detection factor is air pressure according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of an external environment detection module according to an embodiment of the present application;

Fig. 8 is a schematic structural diagram of a self-checking operation and maintenance module according to an embodiment of the present application;

fig. 9 is a flowchart of steps of a self-adaptive control method for a fume hood according to an embodiment of the present application.

Detailed Description

For further explanation of the technical means and effects adopted by the present application for achieving the intended purpose, exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of methods and systems that are consistent with aspects of the application as detailed in the accompanying claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to any or all possible combinations including one or more of the associated listed items.

The following detailed description of specific embodiments, features and effects according to the present application is provided with reference to the accompanying drawings and preferred embodiments.

Example 1

Referring to fig. 1, an embodiment of the present application provides a self-adaptive control system for a fume hood, including a main control module, an internal environment detection module, an external environment detection module, a ventilation control module, and a self-checking operation and maintenance module;

the main control module and the ventilation control module are respectively in communication connection with the internal environment detection module and the external environment detection module; the self-checking operation and maintenance module is in communication connection with the ventilation control module;

the main control module is used for generating a control instruction and controlling the internal environment detection module and the external environment detection module to carry out environment detection;

the internal environment detection module is used for detecting the internal environment of the fume hood according to the control instruction and generating an internal detection result;

the external environment detection module is used for detecting the external environment of the fume hood according to the control instruction and generating an external detection result;

the ventilation control module is used for controlling the ventilation cabinet to ventilate according to the internal detection result and/or the external detection result;

The self-checking operation and maintenance module is used for regularly carrying out self-checking and maintenance on the fume hood;

wherein the control instruction includes an internal detection instruction and an external detection instruction.

Specifically, the main control module generates the control instruction and uses the control instruction to control the internal environment detection module and the external environment detection module to detect the environment of the fume hood, and in the embodiment, the control instruction comprises the internal detection instruction and the external detection instruction, and the control instruction is used for controlling the fume hood so that the fume hood has more maneuverability and directivity; the internal environment detection module detects the internal environment of the fume hood according to the internal detection instruction, and generates an internal detection report which can embody the internal environment of the fume hood; the external environment detection module detects the external environment of the fume hood according to the external detection instruction, and generates an external detection report which can embody the external environment of the fume hood; the ventilation control module controls the ventilation cabinet to ventilate according to the internal detection report and/or the external detection report, so that when the ventilation cabinet detects that the internal environment has factors influencing the balance in the cabinet, ventilation treatment can be timely performed, and the influence of the internal environment influence factors and the external environment influence factors on the normal operation of the ventilation cabinet is avoided; finally, the fume hood can carry out periodic self-check and periodic maintenance on equipment, ventilation conditions and the like of the fume hood through the self-check operation and maintenance module, so that the fume hood can be ensured that the performance of the fume hood is not affected while the fume hood is in normal operation.

As shown in fig. 2, in one embodiment provided by the present application, the internal environment detection module includes an internal detection unit, an internal acquisition unit, and an internal analysis unit that are sequentially connected in communication;

the internal detection unit is used for detecting the internal environment according to the internal detection instruction and acquiring an internal detection factor;

the internal acquisition unit is used for acquiring internal environment data of the fume hood according to the internal detection factors;

the internal analysis unit is used for analyzing the internal environment data and generating the internal detection result;

wherein the internal detection factors include microorganisms, temperature, humidity, gas and air pressure.

Specifically, in the internal environment detection module of the present application, the internal detection unit detects the internal environment according to the internal detection instruction generated by the main control module to obtain the internal detection factor, where the internal detection factor includes, but is not limited to, a microorganism, a temperature, a humidity, a gas, and an air pressure, and the microorganism includes a virus, a bacterium, and the like; the internal detection factor in this embodiment is expressed as a factor that affects the internal environment of the fume hood; after the internal detection factors are acquired, the internal acquisition unit acquires the data of the internal environment according to the internal detection factors, so that the internal environment data which can reflect the internal environment condition of the fume hood is acquired; and finally, the internal analysis module analyzes the internal environment data so as to generate an internal detection result. It should be noted that, the internal detection factor may be one or more (two or more) internal detection factors, and each internal detection factor may generate an analysis result related to the detection factor, so when only one internal detection factor affecting the fume hood exists in the internal environment, the analysis report of the factor is the internal detection result finally output by the internal analysis unit; if two or two internal detection factors affecting the fume hood exist, the final internal detection result output by the internal analysis unit is the detection result output by the analysis results of the internal detection factors.

Further, as shown in fig. 3, if the internal detection factor is a microorganism, the analysis of the microorganism includes the steps of:

s31, setting a content threshold value of microorganisms in the fume hood;

s32, collecting microorganism particles in the air by adopting an air sampling method;

s33, taking the microorganism particles as a sample, and analyzing by an analysis method to determine the microorganism content;

s34, comparing the microorganism content with the content threshold value to obtain an analysis result;

wherein the analysis method comprises one or more of a culture counting method, a molecular biological method and a protein detection method;

wherein the method of air sampling includes one or more of multipoint sampling, timing sampling and parallel sampling.

Specifically, if the above-mentioned internal detection factor is a microorganism, that is, a bacterium, a virus, or the like, the microorganism is analyzed and judged; firstly, setting a content threshold value of microorganisms in a fume hood, wherein the content threshold value is expressed as: if the content of microorganisms in the fume hood does not exceed the content threshold, the environment in the fume hood is safe, the safety of operators is not jeopardized, and cross contamination is not caused; if the content of microorganisms in the fume hood exceeds the content threshold, the environment in the fume hood is polluted by the microorganisms, so that the safety and the health of operators are influenced; secondly, collecting microorganism particles in the air by adopting an air sampling method, wherein the air sampling in the embodiment is to collect microorganism particle samples in the air in the fume hood by using a proper air sampler; next, the collected sample is analyzed to determine the content of the microorganism, and in this embodiment, the analysis method used includes one or more of a culture counting method, a molecular biology method and a protein detection method, either alone or in combination of two or more of them; finally, the actual detected microorganism content is compared and analyzed with a set content threshold, and if the microorganism content is above the set threshold, the microorganism content in the fume hood has exceeded the expected limit, and corresponding treatment measures, such as enhanced cleaning and disinfection, adjustment of the fume hood or replacement of the filter, etc., are required.

In the above analysis method, the culture counting method is to culture a sample on a suitable medium and count the formed microbial colonies; by counting the number of colonies, it can be estimated whether the content of microorganisms exceeds a set threshold; the molecular biology method is to directly detect DNA or RNA of microorganism by utilizing molecular biology technologies such as PCR (Polymerase Chain Reaction ), real-time fluorescence quantitative PCR (qPCR), nucleic acid sequencing and the like, and can judge whether the content of the microorganism exceeds a set threshold value according to the detection result; protein detection is to detect specific protein markers of microorganisms by using a protein detection method such as ELISA (Enzyme Linked Immunosorbent Assay, enzyme-linked immunosorbent assay), and these markers can be correlated with the content of microorganisms, and by detecting the concentration of the markers, it is determined whether the content of microorganisms exceeds a set threshold.

Regarding the above air sampling, which has various defects such as variability, loss of vitality, various possibilities of hybridization, and merely representative of transient states, one or more of combination sampling of multi-point sampling, timing sampling, and parallel sampling may be employed in the present embodiment to avoid the above defects. The multipoint sampling is that a plurality of sampling points are arranged in the fume hood, so that the representativeness and the reliability of sampling can be improved, and the sampling points at different positions can cover different areas of the space in the fume hood, so that the distribution condition of microorganisms can be more comprehensively known; the timing sampling is carried out continuously in a certain time range, so that the change trend of the concentration of microorganisms in the air can be obtained, and the seasonal and periodic fluctuation of the microorganisms and the difference in different time periods can be known; parallel sampling is to perform multiple parallel samples simultaneously, and repeated sampling is performed at the same time and position using the same sampling method and apparatus, and by comparing the results of parallel sampling, the accuracy and repeatability of sampling can be evaluated. The method can effectively overcome some defects of air sampling and obtain more accurate and comprehensive microorganism detection results.

Further, as shown in fig. 4, if the internal detection factor is the temperature and the humidity, the temperature and the humidity are detected and analyzed, and one or more of a temperature and humidity sensor, a data recorder and a thermal infrared imager are used for the detection and the analysis.

In a preferred embodiment of the present application, the temperature and humidity sensor is combined with the thermal infrared imager and applied to detect the temperature and the humidity, comprising the steps of:

s41, detecting the temperature and the humidity through the temperature and humidity sensor, and obtaining a first temperature and a first humidity;

s42, detecting the temperature through the thermal infrared imager, and obtaining a second temperature;

s43, constructing a classification model according to the first temperature and the first humidity;

s44, constructing a temperature distribution model according to the second temperature;

s45, acquiring real-time temperature and real-time humidity, inputting the real-time temperature and the real-time humidity into the two classification models, judging whether the real-time temperature and the real-time humidity exceed a set temperature threshold and a set humidity threshold, and acquiring a two-classification judgment result;

s46, inputting the real-time temperature into the temperature distribution model to obtain a real-time temperature fluctuation map;

S47, analyzing the temperature and the humidity according to the classification judgment result and the real-time temperature fluctuation graph.

Specifically, if the internal detection factor is temperature and humidity, the temperature and humidity are analyzed and judged, and in the embodiment, one or more of a temperature and humidity sensor, a data recorder and a thermal infrared imager are adopted to detect and analyze the temperature and the humidity; the method comprises the following steps: firstly, detecting the temperature and the humidity in the fume hood through a temperature and humidity sensor to obtain a first temperature and a first humidity, and secondly, detecting the temperature through a thermal infrared imager to obtain a second temperature; constructing a classification model according to the first temperature and the first humidity, and constructing a temperature distribution model according to the second temperature; acquiring real-time temperature and real-time humidity in the fume hood, inputting the real-time temperature and the real-time humidity into the two classification models, judging whether the real-time temperature and the real-time humidity exceed a set temperature threshold value and a set humidity threshold value, and acquiring a two-classification judgment result; inputting the real-time temperature into the temperature distribution model to obtain a real-time temperature fluctuation diagram; and finally, analyzing whether the temperature and the humidity in the fume hood exceed the temperature threshold and the humidity threshold set in the hood according to the combination of the classification judgment result and the real-time temperature fluctuation diagram. According to the application, the temperature and humidity in the cabinet are detected by adopting the mode of combining the plurality of detection devices, and the output results of the two models are combined to analyze and judge the environment in the cabinet, so that the accuracy of temperature and humidity detection in the cabinet and the reliability of analysis of the detection results can be ensured.

Further, as shown in fig. 5, if the internal detection factor is the gas, the detection of the gas includes a gas sensor and a gas chromatograph; the gas chromatograph is used for analyzing the gas components in the fume hood to obtain harmful gases; the gas sensor is used for monitoring the concentration of harmful gas in real time;

the detection of the gas comprises the following steps:

s51, acquiring the internal environment data of the fume hood;

s52, analyzing the gas components according to the gas chromatograph to obtain harmful gases therein;

s53, monitoring the concentration of the harmful gas according to the gas sensor;

s54, establishing a time sequence analysis model according to the concentration of the harmful gas;

s55, analyzing the change rule of the concentration of the harmful gas according to the time sequence analysis model;

s56, acquiring the real-time concentration of harmful gases in the fume hood;

s57, judging whether the real-time concentration exceeds a set concentration threshold value of the harmful gas according to the change rule, and obtaining a concentration judgment result;

and S58, carrying out ventilation treatment on the fume hood according to the concentration judgment result.

Specifically, if the internal detection factor is a gas, the gas is analyzed and judged, and in the embodiment, a gas sensor and a gas chromatograph are used for detecting the gas, wherein the gas chromatograph is used for analyzing the gas components in the fume hood and detecting harmful gases in the fume hood; the gas sensor is used for monitoring the concentration of harmful gas in real time; the method comprises the following steps: firstly, acquiring internal environment data of a fume hood, and analyzing gas components in the internal environment data by adopting a gas chromatograph to acquire harmful gases in the internal environment data; monitoring the concentration of the harmful gas based on the gas sensor; further, a concentration analysis model based on time sequence is established according to the concentration of the harmful gas; analyzing the change rule of the concentration of the harmful gas according to the time sequence analysis model; the method comprises the steps of obtaining real-time concentration of harmful gas in a fume hood, judging whether the real-time concentration exceeds a set concentration threshold of the harmful gas according to a change rule, and if the real-time concentration exceeds the concentration threshold, carrying out ventilation treatment on the fume hood; if not, no ventilation treatment is performed.

It should be noted that, regarding the above gas sensor, it can monitor the concentration of harmful gas in the fume hood in real time; common gas sensors include combustible gas sensors, toxic gas sensors, volatile organic compound sensors, and the like, and in this embodiment, the gas sensors can sense a specific gas and convert the specific gas into an electrical signal, and then analyze and process the signal to further obtain concentration information of the harmful gas.

With respect to gas chromatographs, which can be used for accurate analysis of gas components in a fume hood, it can determine the concentration and relative content of different gases by sample injection, separation and detection of gas samples; can also detect various harmful gases such as toxic gases and volatile organic compounds, and is widely used in laboratories and industrial environments.

Regarding the time series analysis model, which may be used in the present embodiment to model and predict the trend and the periodic variation of the harmful gas concentration data, the above models include ARIMA (Autoregressive Integrated Moving Average Model, autoregressive integral moving average model), SARIMA (Seasonal Autoregressive Integrated Moving Average, seasonal autoregressive integral moving average model), ARMA (Autoregressive Integrated Moving Average model, autoregressive moving average model), and the like, information such as trend and periodicity may be obtained by analyzing the historical concentration data, thereby predicting the future concentration variation.

In this embodiment, since there may be various influencing factors such as temperature, humidity, microorganism, air pressure, etc., the present embodiment may also establish a linear regression model for establishing a relationship between the concentration of harmful gas and other related factors, by collecting and analyzing data of various variables (such as temperature, humidity, microorganism, air pressure, etc.), it may be possible to determine factors related to the concentration of harmful gas, and construct a linear regression model to describe the relationship between them, which may include temperature, humidity, air speed, the duration of use of the fume hood, etc.; the linear regression model may provide the extent and direction of influence of the correlation factors on the concentration of the harmful gas.

Further, as shown in fig. 6, if the internal detection factor is the air pressure, the detection of the air pressure includes a pressure sensor and a differential pressure sensor; the pressure sensor is used for monitoring the internal air pressure of the fume hood; the differential pressure sensor is used for measuring the air pressure difference between the inside and the outside of the fume hood.

Specifically, the detection of the air pressure includes the steps of:

s61, collecting and recording historical data of air pressure in the fume hood;

the change trend and the rule of the air pressure can be known by analyzing the data; in the embodiment, a statistical method and a visualization tool are used, such as drawing a change curve of air pressure along with time, calculating statistical indexes such as average air pressure and standard deviation, and the like, so that the characteristics such as periodicity and trend of the air pressure in the fume hood can be disclosed;

S62, setting a reasonable air pressure range and setting an alarm mechanism;

when the air pressure in the fume hood exceeds a preset range, an alarm is triggered, the abnormal condition of the air pressure can be analyzed through real-time monitoring and alarm recording, and measures are timely taken to adjust and repair so as to ensure the normal operation of the fume hood;

s63, calibrating and verifying the pressure sensor in the fume hood regularly; regular calibration is carried out to ensure the accuracy of the measurement result, and reasonable correction and adjustment are carried out by comparing the deviation between the measured value of the sensor and the known standard value; calibration and verification can ensure the accuracy of air pressure analysis;

s64, establishing an air pressure regression model based on historical air pressure data; future barometric pressure changes are predicted using the model, which may optimize prediction accuracy based on other relevant factors (e.g., temperature, humidity, wind speed, etc.), and help predict barometric pressure trends within the fume hood for corresponding adjustments and controls.

Through the analysis method, the air pressure condition in the fume hood can be better understood, the change rule of the air pressure condition is known, the abnormal condition is timely detected, and the normal operation and the safety of the fume hood are ensured through necessary adjustment and control.

As shown in fig. 7, in one embodiment provided by the present application, the external environment detection module includes an external acquisition unit, an external detection unit, and an external analysis unit that are sequentially connected in communication;

the external detection unit is used for detecting the external environment according to the external detection instruction and acquiring an external detection factor;

the external acquisition unit is used for acquiring external environment data of the fume hood according to the external detection factors;

the external analysis unit is used for analyzing the external environment data and generating the external detection result;

wherein the external detection factors include air flow rate and sound decibels;

the external detection unit comprises a sound decibel detection unit and an air flow rate detection unit which are in communication connection;

the sound detection unit is used for acquiring sound decibels when the fume hood operates and judging whether the sound decibels are noise or not;

the air flow rate detection unit is used for detecting the external air flow rate of the fume hood.

Specifically, in the external environment detection module of the present application, the external detection unit detects the external environment according to the external detection instruction generated by the main control module, and obtains the external detection factor, and in this embodiment, the internal detection factor includes but is not limited to the air flow rate and the sound decibel; the external detection factor in this embodiment is expressed as a factor that affects the external environment of the fume hood; after the external detection factors are acquired, the external acquisition unit acquires the data of the external environment according to the external detection factors, so that the external environment data which can reflect the external environment condition of the fume hood is acquired; finally, the external analysis module analyzes the external environment data so as to generate an external detection result. It should be noted that, the external detection factor may be one or more (two or more) external detection factors, and each external detection factor may generate an analysis result related to the detection factor, so when only one external detection factor affecting the fume hood exists in the external environment, the analysis report of the factor is the external detection result finally output by the external analysis unit; if two or two external detection factors affecting the fume hood exist, the final external detection result output by the external analysis unit is the detection result output by the analysis results of the external detection factors.

It should be noted that, in this embodiment, the detection of the sound decibels in the external detection factor is mainly to ensure that appropriate comfort is provided for the operator in the working environment of the fume hood, so as to improve the working efficiency thereof. The detection of the air flow rate in the embodiment is to ensure that the air flow rate in the fume hood is in a proper range, because the proper air flow rate can improve the protection effect of the fume hood; the fume hood reduces the potential exposure risk to operators by venting air outwardly from the work area, while higher air flow rates can more effectively control the diffusion of hazardous gases, particulates, and biological samples, thereby reducing the risk of the operator being infected or contaminated. On the other hand, the higher air flow rate can increase the trapping efficiency of the filter to pollutants in the air, and the trapping effect of the filter to harmful gases and particulate matters can be improved by increasing the air flow rate of the air inlet, so that the air quality in a working area is maintained.

In one embodiment provided by the application, the ventilation control module comprises an internal control unit and an external control unit;

the internal control unit is used for carrying out ventilation treatment on the internal environment of the ventilation cabinet according to the internal detection result;

And the external control unit is used for carrying out ventilation treatment on the external environment of the fume hood according to the external detection result.

Specifically, the ventilation control module of the embodiment of the application comprises the internal control unit for performing ventilation treatment on the internal environment and the external control unit for performing ventilation treatment on the external environment; the internal control unit ventilates the internal environment of the fume hood according to the internal detection result output by the internal environment detection module; and the external control unit carries out ventilation treatment on the external environment of the fume hood according to the external detection result output by the external environment detection module.

As shown in fig. 8, in one embodiment provided by the present application, the self-checking operation and maintenance module includes an environment self-checking unit, an equipment self-checking unit and a cleaning maintenance unit; the cleaning maintenance unit is respectively in communication connection with the environment self-checking unit and the equipment self-checking unit;

the environment self-checking unit is used for periodically performing self-checking on the internal environment and the external environment of the fume hood to generate an environment self-checking report;

the equipment self-checking unit is used for carrying out self-checking on the operation equipment of the fume hood at regular intervals to generate an equipment self-checking report;

And the cleaning and maintaining unit is used for cleaning and maintaining according to the environment self-checking report and the equipment self-checking report.

Specifically, in the self-checking operation and maintenance module of the embodiment, the environment self-checking unit is used for periodically and self-checking the internal environment and the external environment of the fume hood, so as to generate an environment self-checking report; the equipment self-checking unit is used for carrying out periodic self-checking on the equipment of the fume hood, so that an equipment self-checking report is generated; and finally, cleaning and maintaining the fume hood through a cleaning and maintaining unit according to the environment self-checking report and the equipment self-checking report.

In this embodiment, the self-test operation and maintenance module includes, but is not limited to, periodic cleaning of the inside and outside surfaces and fittings of the fume hood, filter replacement, fan and exhaust duct cleaning, electrical connection and troubleshooting checking, airflow balance and speed checking, system calibration and testing, and maintenance records and documents; the method specifically comprises the following steps:

the filters in the fume hood need to be periodically checked and replaced to ensure the filtering effect and air quality;

fans and exhaust ducts in the fume hood also need to be cleaned periodically to maintain their operational efficiency and to prevent the impact of accumulated dust or dirt on system performance;

Regularly checking the electrical connection of the fume hood, ensuring the safety and reliability of the fume hood, and timely taking measures to remove and repair the fault if any electrical fault or abnormal condition is found;

by using proper detection equipment, the air flow balance and speed of the fume hood are checked regularly to ensure the normal operation of the fume hood;

performing system calibration and testing regularly to verify the performance and accuracy of the fume hood; testing for air flow uniformity, filtration efficiency, noise level, etc. can be performed using appropriate testing equipment;

maintaining detailed records and documents, including information on maintenance operations, inspection results, date and type of replacement parts, etc., helps track maintenance history and performance of the fume hood and takes necessary action in time.

In summary, by detecting the internal environment and the external environment of the fume hood, the application effectively inhibits the generation and diffusion of bacterial viruses in the fume hood, prevents unsmooth ventilation and equipment performance damage caused by high temperature and high humidity, prevents the health of personnel from being damaged by excessive harmful gas concentration and prevents the air circulation from being blocked caused by low air pressure in the fume hood, thereby improving the timeliness of pollutant and harmful gas treatment; and detecting and ventilating control are carried out aiming at different influencing factors, and self-checking and maintenance are carried out on equipment in the ventilating cabinet at regular intervals, so that the performance of the ventilating cabinet is not influenced.

The application also has the following beneficial effects:

(1) According to the application, the main control module generates the control instruction, so that the internal environment detection module and the external environment detection module are respectively controlled to detect the internal environment and the external environment of the fume hood, and then the ventilation control is performed through the ventilation control module according to the detection results of the two modules, so that the ventilation performance of the fume hood is prevented from being influenced by the internal environment and/or the external environment of the fume hood, and the safety of operators and the suitability of the internal environment of the fume hood are further ensured.

(2) In the internal environment detection module, the microbial contamination caused by the too high bacterial and virus content is prevented by detecting the microbial content in the fume hood; the problems that the performance of the ventilating cabinet is affected due to high temperature and high humidity are prevented by detecting the temperature and the humidity in the cabinet, so that discomfort of operators is avoided; the harmful gas and the content thereof in the cabinet are detected, so that the environment in the cabinet is prevented from being polluted by the high-concentration harmful gas, and the health of operators is further prevented from being endangered; through detecting the internal air pressure of cabinet, prevent effectively that the leakage and the propagation of harmful substance that lead to because of the atmospheric pressure is too low to prevent to influence ventilation effect and working area's security because of the air current disturbance, the unsmooth scheduling problem of airing exhaust.

(3) In the external environment detection module, the air flow rate of the external environment of the cabinet is also detected, so that excessive diffusion of biological pollution caused by too low air flow rate is avoided, and the protection effect and the filtering efficiency of the ventilation cabinet are influenced; and the noise is divided and timely protected and processed by detecting the sound decibels, so that the situation that operators cannot be in a comfortable and quiet operating environment due to noise and interference is prevented.

(4) In the ventilation control module, the ventilation cabinet is ventilated according to the detection results of the internal environment detection and/or the external environment detection, and because the internal environment and the external environment of the ventilation cabinet have various influence factors, the ventilation control module can selectively perform ventilation control according to the detection results, and if a plurality of influence factors are detected to exist simultaneously, the module can perform ventilation control on the internal environment and the external environment of the cabinet, so that the multiple selectivity and the effectiveness of the ventilation control are ensured, and the timeliness and the high efficiency of ventilation are further ensured.

(5) In the self-checking operation and maintenance module, the self-checking of the fume hood can be carried out regularly, including but not limited to the self-checking of the internal and external environment, the operation equipment and the ventilation effect of the fume hood, and the module prevents the equipment performance and the ventilation efficiency of the fume hood from being reduced due to old and damaged fume hood ventilation equipment through regular self-checking and timely cleaning maintenance, so that the ventilation efficiency of the fume hood is further improved.

(6) According to the application, different detection methods and means are adopted in the detection of the internal environment aiming at different influencing factors such as microorganisms, temperature, humidity, gas, air pressure and the like, so that the detection result of the internal environment is more accurate and reliable, and the ventilation control module is more rapid and timely, thereby improving the ventilation efficiency.

Example 2

Referring to fig. 9, an embodiment of the present application provides a self-adaptive control method for a fume hood, including the following steps:

s1, a control instruction is generated by a fume hood through a main control module; the control instruction comprises an internal detection instruction and an external detection instruction;

s2, detecting the internal environment of the fume hood according to the internal detection instruction to generate an internal detection result;

s3, detecting the external environment of the fume hood according to the external detection instruction to generate an external detection result;

s4, controlling the ventilation cabinet to ventilate according to the internal detection result and/or the external detection result;

s5, carrying out self-inspection and maintenance on the fume hood regularly;

in the step S2, the internal environment is detected according to the internal detection instruction, and an internal detection factor is obtained;

The internal detection factors include microorganisms, temperature, humidity, gas and air pressure;

in the step S3, detecting the external environment according to the external detection instruction, and obtaining an external detection factor;

the external detection factors include air flow rate and sound decibels.

Specifically, the application generates the control instruction and uses the control instruction to control the fume hood to perform environment detection, and in the embodiment, the control instruction comprises an internal detection instruction and an external detection instruction, and the control instruction is used for controlling the fume hood, so that the control of the fume hood has more maneuverability and directivity; detecting the internal environment of the fume hood according to the internal detection instruction to generate an internal detection report, wherein the internal detection report can reflect the internal environment of the fume hood; detecting the external environment of the fume hood according to the external detection instruction to generate an external detection report, wherein the external detection report can reflect the external environment of the fume hood; the ventilation cabinet is controlled to ventilate according to the internal detection report and/or the external detection report, so that when the internal environment is detected to have factors influencing the balance in the cabinet, ventilation treatment can be timely carried out, and the influence of the internal environment influence factors and the external environment influence factors on the normal operation of the ventilation cabinet is avoided; finally, the fume hood can carry out periodic self-check and periodic maintenance on equipment, ventilation conditions and the like of the fume hood, so that the fume hood can be normally operated and the performance of the fume hood can be ensured not to be influenced.

According to the application, by detecting the internal environment and the external environment of the ventilation cabinet, the generation and the diffusion of bacterial viruses in the cabinet are effectively inhibited, unsmooth ventilation and equipment performance damage caused by high temperature and high humidity are prevented, the health of personnel is prevented from being damaged due to the too high concentration of harmful gas, the air circulation blockage caused by low air pressure in the cabinet is prevented, and the timeliness of pollutant and harmful gas treatment is improved; and detecting and ventilating control are carried out aiming at different influencing factors, and self-checking and maintenance are carried out on equipment in the ventilating cabinet at regular intervals, so that the performance of the ventilating cabinet is not influenced.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the system is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The present application is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present application.

Claims (10)

1. A fume chamber self-adaptation control system, its characterized in that: the system comprises a main control module, an internal environment detection module, an external environment detection module, a ventilation control module and a self-checking operation and maintenance module;

the main control module and the ventilation control module are respectively in communication connection with the internal environment detection module and the external environment detection module; the self-checking operation and maintenance module is in communication connection with the ventilation control module;

the main control module is used for generating a control instruction and controlling the internal environment detection module and the external environment detection module to carry out environment detection;

the internal environment detection module is used for detecting the internal environment of the fume hood according to the control instruction and generating an internal detection result;

the external environment detection module is used for detecting the external environment of the fume hood according to the control instruction and generating an external detection result;

the ventilation control module is used for controlling the ventilation cabinet to ventilate according to the internal detection result and/or the external detection result;

the self-checking operation and maintenance module is used for regularly carrying out self-checking and maintenance on the fume hood;

wherein the control instruction includes an internal detection instruction and an external detection instruction.

2. A fume hood adaptive control system according to claim 1, wherein: the internal environment detection module comprises an internal detection unit, an internal acquisition unit and an internal analysis unit which are sequentially connected in a communication way;

the internal detection unit is used for detecting the internal environment according to the internal detection instruction and acquiring an internal detection factor;

the internal acquisition unit is used for acquiring internal environment data of the fume hood according to the internal detection factors;

the internal analysis unit is used for analyzing the internal environment data and generating the internal detection result;

wherein the internal detection factors include microorganisms, temperature, humidity, gas and air pressure.

3. A fume hood adaptive control system according to claim 2, wherein: if the internal detection factor is a microorganism, the analysis of the microorganism comprises the steps of:

setting a content threshold of microorganisms in the fume hood;

collecting microorganism particles in air by adopting an air sampling method;

taking the microorganism particles as a sample and adopting an analysis method to analyze the microorganism particles to determine the microorganism content;

Comparing the microorganism content with the content threshold value to obtain an analysis result;

wherein the analysis method comprises one or more of a culture counting method, a molecular biological method and a protein detection method;

wherein the method of air sampling includes one or more of multipoint sampling, timing sampling and parallel sampling.

4. A fume hood adaptive control system according to claim 2, wherein: and if the internal detection factors are the temperature and the humidity, detecting and analyzing the temperature and the humidity, wherein the detection and the analysis adopt one or more of a temperature and humidity sensor, a data recorder and a thermal infrared imager.

5. A fume hood adaptive control system according to claim 2, wherein: if the internal detection factor is the gas, detecting the gas comprises a gas sensor and a gas chromatograph; the gas chromatograph is used for analyzing the gas components in the fume hood to obtain harmful gases; the gas sensor is used for monitoring the concentration of harmful gas in real time.

6. A fume hood adaptive control system according to claim 2, wherein: if the internal detection factor is the air pressure, detecting the air pressure comprises a pressure sensor and a differential pressure sensor; the pressure sensor is used for monitoring the internal air pressure of the fume hood; the differential pressure sensor is used for measuring the air pressure difference between the inside and the outside of the fume hood.

7. A fume hood adaptive control system according to claim 1, wherein: the external environment detection module comprises an external acquisition unit, an external detection unit and an external analysis unit which are sequentially in communication connection;

the external detection unit is used for detecting the external environment according to the external detection instruction and acquiring an external detection factor;

the external acquisition unit is used for acquiring external environment data of the fume hood according to the external detection factors;

the external analysis unit is used for analyzing the external environment data and generating the external detection result;

wherein the external detection factors include air flow rate and sound decibels;

the external detection unit comprises a sound decibel detection unit and an air flow rate detection unit which are in communication connection;

the sound detection unit is used for acquiring sound decibels when the fume hood operates and judging whether the sound decibels are noise or not;

the air flow rate detection unit is used for detecting the external air flow rate of the fume hood.

8. A fume hood adaptive control system according to claim 1, wherein: the ventilation control module comprises an internal control unit and an external control unit;

The internal control unit is used for carrying out ventilation treatment on the internal environment of the ventilation cabinet according to the internal detection result;

and the external control unit is used for carrying out ventilation treatment on the external environment of the fume hood according to the external detection result.

9. A fume hood adaptive control system according to claim 1, wherein: the self-checking operation and maintenance module comprises an environment self-checking unit, an equipment self-checking unit and a cleaning and maintenance unit; the cleaning maintenance unit is respectively in communication connection with the environment self-checking unit and the equipment self-checking unit;

the environment self-checking unit is used for periodically performing self-checking on the internal environment and the external environment of the fume hood to generate an environment self-checking report;

the equipment self-checking unit is used for carrying out self-checking on the operation equipment of the fume hood at regular intervals to generate an equipment self-checking report;

and the cleaning and maintaining unit is used for cleaning and maintaining according to the environment self-checking report and the equipment self-checking report.

10. A self-adaptive control method for a fume hood is characterized by comprising the following steps of: the method comprises the following steps:

s1, a control instruction is generated by a fume hood through a main control module; the control instruction comprises an internal detection instruction and an external detection instruction;

S2, detecting the internal environment of the fume hood according to the internal detection instruction to generate an internal detection result;

s3, detecting the external environment of the fume hood according to the external detection instruction to generate an external detection result;

s4, controlling the ventilation cabinet to ventilate according to the internal detection result and/or the external detection result;

s5, carrying out self-inspection and maintenance on the fume hood regularly;

in the step S2, the internal environment is detected according to the internal detection instruction, and an internal detection factor is obtained;

the internal detection factors include microorganisms, temperature, humidity, gas and air pressure;

in the step S3, detecting the external environment according to the external detection instruction, and obtaining an external detection factor;

the external detection factors include air flow rate and sound decibels.