CN117073136B - Filter screen cleaning reminding method and system based on safety value verification - Google Patents
Filter screen cleaning reminding method and system based on safety value verification Download PDFInfo
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- 238000004140 cleaning Methods 0.000 title claims abstract description 144
- 238000012795 verification Methods 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 46
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 118
- 231100000719 pollutant Toxicity 0.000 claims abstract description 116
- 238000009423 ventilation Methods 0.000 claims abstract description 45
- 238000012544 monitoring process Methods 0.000 claims abstract description 22
- 238000012423 maintenance Methods 0.000 claims abstract description 15
- 238000007781 pre-processing Methods 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims description 84
- 239000000356 contaminant Substances 0.000 claims description 30
- 230000008569 process Effects 0.000 claims description 16
- 230000002159 abnormal effect Effects 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 3
- 230000036541 health Effects 0.000 description 4
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- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000013618 particulate matter Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 238000010438 heat treatment Methods 0.000 description 2
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/39—Monitoring filter performance
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/50—Air quality properties
- F24F2110/64—Airborne particle content
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a filter screen cleaning reminding method and system based on safety value verification, which relate to the technical field of filter screens of ventilation equipment, and comprise the following steps: s1, arranging an air quality sensor outside a filter screen of ventilation equipment, and collecting pollutant data; s2, setting differential pressure meters on two sides of the filter screen, and collecting differential pressure data on two sides of the filter screen; s3, setting safety values for the pollutant data and the differential pressure data respectively, checking the safety values, and selecting to execute operation of continuous monitoring, overhauling maintenance or cleaning prediction according to the checking result; s4, when the cleaning prediction operation is selected to be executed, preprocessing pollutant data and differential pressure data; s5, feeding back a predicted result of the duration to be cleaned to the management center to realize cleaning reminding of the filter screen. The invention realizes the cleaning reminding and cleaning alarm reminding of the filter screen, jointly monitors different data parameters, more accurately judges the cleaning state of the filter screen and predicts the time length to be cleaned.
Description
Technical Field
The invention relates to the technical field of filter screens of ventilation equipment, in particular to a filter screen cleaning reminding method and system based on safety value verification.
Background
Ventilation devices are used to circulate air and supply fresh air through air flows in buildings, vehicle interiors or other enclosed environments, thereby improving indoor air quality and removing dirty air. They are devices that exchange indoor air with outdoor air, ensure ventilation and clean air, thereby maintaining indoor air ventilation, freshness and helping to maintain indoor air quality. These devices may be used in a variety of environments including residential, commercial building, industrial setting, and the like. The main objective of the ventilation device is to expel the indoor dirty air and introduce fresh outside air to ensure that people breathe good air indoors. Common types of ventilation devices include:
air handling Systems (HVAC Systems): the heating ventilation air conditioning system not only can adjust indoor temperature, but also can perform air filtration and circulation in the heating or cooling process, thereby improving indoor air quality.
Fresh air system (Fresh Air Systems): specially for introducing outside air to ensure freshness of indoor air. They can be used alone or in combination with existing hvac systems.
Air purifier (Air purifier): the air purifier can filter and remove pollutants such as particles, pollen, bacteria and the like in indoor air, thereby improving indoor air quality.
Roof ventilation system (Roof Ventilation Systems): these systems may be mounted on roofs with air flow promoted through vents in the roofs to facilitate heat removal and moisture regulation.
Among them, a filter screen is an important component in a ventilation apparatus for filtering and removing particulate matter, pollutants and microorganisms in the air, thereby providing cleaner and healthy indoor air. The filter screen is generally made of fiber materials, paper, cloth and the like, and can be divided into various types according to different filter efficiency, such as a common filter screen, a high-efficiency filter screen, a HEPA filter screen and the like.
The cleaning of the filter screen is an important link in maintenance of the ventilation equipment, because dust, particulate matters, pollutants and the like can be accumulated on the filter screen over time, which can affect the filtering efficiency of the filter screen and the normal operation of the ventilation system. Reasons for the need to clean the filter screen regularly include: maintaining ventilation system performance, contaminants accumulated on the filter screen can impede air flow, reduce ventilation system efficiency, and affect air circulation and indoor air quality. The indoor air quality is maintained, and the uncleaned filter screen can allow pollutants to reenter the indoor air, so that the air quality is reduced, and the health problems such as allergy, asthma and the like can be possibly caused.
The existing cleaning reminding technology can help users to pay attention to cleaning of the filter screen in time, so that the ventilation system and indoor air quality are maintained. Common cleaning reminding techniques include:
1. and (5) periodically reminding: the ventilation device can be provided with a regular reminder to prompt the user to clean and replace the filter screen. The periodic reminding of the burning heat may not consider the actual use condition, and the cleaning requirement of the filter screen can be influenced by the pollution degree and the use frequency.
2. And (3) monitoring a sensor: a sensor is installed in the ventilation system to monitor the differential pressure or air flow of the filter screen, and once a threshold is exceeded, the system will issue a cleaning alert. However, the data monitored by the sensor may be limited by environmental influences or the accuracy of the sensor itself, resulting in reduced accuracy of the cleaning reminder.
3. Smart phone application: the mobile phone is connected to the ventilation system, the state of the filter screen is monitored in real time, and cleaning reminding and maintenance advice are provided. But the user may ignore or forget to clean the reminder, especially when busy.
Disclosure of Invention
Based on the above, it is necessary to provide a filter screen cleaning reminding method and system based on safety value verification for the above technical problems.
In a first aspect, the invention provides a filter screen cleaning reminding method based on safety value verification, which comprises the following steps:
s1, arranging an air quality sensor outside a filter screen of ventilation equipment, and collecting pollutant data;
s2, setting differential pressure meters on two sides of the filter screen, and collecting differential pressure data on two sides of the filter screen;
s3, setting safety values for the pollutant data and the differential pressure data respectively, checking the safety values, and selecting to execute operation of continuous monitoring, overhauling maintenance or cleaning prediction according to the checking result;
s4, when the cleaning prediction operation is selected to be executed, preprocessing pollutant data and differential pressure data, and inputting the pollutant data and differential pressure data into a filter screen cleaning prediction algorithm to predict the duration to be cleaned;
s5, feeding back a predicted result of the duration to be cleaned to the management center to realize cleaning reminding of the filter screen, and feeding back cleaning alarm reminding when the duration to be cleaned is smaller than the cleaning safety limit value.
In one embodiment, setting safety values for the pollutant data and the differential pressure data, and performing safety value verification, and selecting to perform operations of continuing monitoring, overhauling maintenance or cleaning prediction according to a verification result, wherein the operations comprise the following steps:
s31, setting an air quality safety value of pollutant data in the process of acquisition and monitoring;
s32, setting a differential pressure safety value of the differential pressure data in the process of acquisition and monitoring;
s33, setting a unified check period for the air quality sensor and the differential pressure meter;
s34, checking the pollutant data and the differential pressure data according to a checking period;
s35, if the checking result is normal, executing and continuing to monitor until the next checking period is checked;
s36, if the verification result is abnormal, overhauling and maintaining are carried out, and abnormal conditions are checked;
and S37, if the verification result is to be cleaned, cleaning prediction is executed, and the duration to be cleaned is predicted.
In one embodiment, verifying the contaminant data and the differential pressure data according to a verification period includes the steps of:
s341, acquiring the numerical values of pollutant data and differential pressure data in the current verification period, and judging the size relationship between the numerical values and the air quality safety value and the differential pressure safety value respectively;
s342, if the pollutant data are smaller than the air quality safety value and the pressure difference data are smaller than the pressure difference safety value, judging that the verification result of the current verification period is normal;
s343, if the pollutant data is greater than or equal to the air quality safety value or the differential pressure data is greater than or equal to the differential pressure safety value, calculating the change rate of the pollutant data or the differential pressure data, and judging the size relation between the calculation result and the preset change rate safety value;
s344, if the change rate of the pollutant data or the differential pressure data in the current verification period is greater than or equal to the change rate safety value, judging that the verification result of the current verification period is abnormal;
s345, if the change rate of the pollutant data or the differential pressure data in the current verification period is smaller than the change rate safety value, judging that the verification result of the current verification period is to be cleaned.
In one embodiment, calculating the rate of change of the contaminant data or the differential pressure data comprises the steps of:
s3431, respectively calculating a sliding average value of pollutant data and pressure difference data detected in the last n check periods, wherein the sliding average value has a calculation formula:
in the method, in the process of the invention,x n indicating the latestnThe number of contaminant data or differential pressure data over a number of verification cycles;MAindicating that contaminant data or differential pressure data was recentnA running average over each verification period;
s3432, setting a change rate safety value for the pollutant data and the differential pressure data respectively, and then calculating the change rate of the pollutant data and the differential pressure data in the current verification period, wherein a change rate calculation formula is as follows:
in the method, in the process of the invention,CRrepresenting a rate of change of the contaminant data or the differential pressure data;x 0 a value representing contaminant data or differential pressure data during the current verification period.
In one embodiment, when the cleaning prediction operation is selected to be executed, preprocessing the pollutant data and the differential pressure data, and inputting the preprocessed pollutant data and the differential pressure data into the filter screen cleaning prediction algorithm to predict the duration to be cleaned, wherein the method comprises the following steps of:
s41, when the checking result is to be cleaned, integrating the current checking period and the latestnPollutant data and differential pressure data acquired in a plurality of verification periods;
s42, acquiring pollutant data, pressure difference data and cleaning time data acquired in the historical operation process of the same type of ventilation equipment and the filter screen to form a historical database;
s43, preprocessing pollutant data and differential pressure data;
s44, setting a highest limit value for the differential pressure data as a threshold value for cleaning the filter screen;
s45, using pollutant data as an associated variable, and establishing a filter screen cleaning prediction algorithm which takes differential pressure data as an independent variable and takes a history database as a basis;
s46, pollutant data and pressure difference data in the current verification period are used as input, and the filter screen cleaning prediction algorithm is utilized to predict the cleaning time.
In one embodiment, preprocessing the contaminant data and differential pressure data includes the steps of:
s431, sorting according to the time sequence of the verification period, and aligning the time stamp information between the two data sequences of the pollutant data and the differential pressure data;
s432, checking the integrity of pollutant data and differential pressure data respectively, and filling missing values in the two data sequences in a median mode.
In one embodiment, the filter screen cleaning prediction algorithm based on the historical database and using the contaminant data as the associated variable to establish the differential pressure data as the independent variable comprises the following steps:
s451, drawing a change curve of pressure difference data in an initial check period to a current check period, and searching a historical change curve which is the same as the current pressure difference data in a historical database;
s452, using pollutant data as related variables affecting the change of the differential pressure data, and searching a predicted change curve most similar to the current filter screen in the historical change curve;
s453, predicting the cleaning time of the current filter screen according to the cleaning time data stored in the prediction change curve, and taking the prediction result as the cleaning time of the filter screen.
In one embodiment, using the contaminant data as an associated variable affecting the change in differential pressure data, searching the historical change curve for a predicted change curve that is most similar to the current filter screen includes the steps of:
s4521 to the nearest current verification periodnThe weight value w is given to each check period 1 To the nearestnAll check periods before the check period are given weight value w 2 Calculating an actual measurement weighted average of pollutant data in an initial check period to a current check period;
s4522, acquiring historical pollutant data corresponding to the historical change curve and utilizing the historical pollutant data to the latestnCalculating historical weighted average in a mode of giving different weight values to each verification period;
and S4523, searching a historical weighted average closest to the numerical value of the actually measured weighted average in all the historical weighted averages, and taking a historical change curve corresponding to the historical weighted average as a prediction change curve.
In one embodiment, predicting the cleaning time of the current filter screen according to the cleaning time data stored in the predicted variation curve, and taking the predicted result as the cleaning time duration of the filter screen includes the following steps:
s4531, acquiring coordinates of a node corresponding to current differential pressure data in a prediction change curve, and acquiring a period interval from the node to a node corresponding to the highest limit value;
s4532, converting the period interval between two nodes into a time value in combination with the check period, and taking the time value as the time length to be cleaned of the current filter screen.
In a second aspect, the present invention further provides a filter screen cleaning reminding system based on security value verification, the system comprising: the system comprises a filter screen monitoring module, a safety value checking module, a cleaning prediction module, a cleaning reminding module and a management center;
the filter screen monitoring module is used for arranging an air quality sensor and a differential pressure meter on two sides of a filter screen of the ventilation equipment to collect pollutant data and differential pressure data;
the safety value verification module is used for setting an air quality safety value and a pressure difference safety value, verifying the safety value of the pollutant data and the pressure difference data, and allocating and issuing an operation instruction;
the cleaning prediction module is used for running a filter screen cleaning prediction algorithm to predict the time length to be cleaned of the filter screen according to the historical database, the pollutant data and the pressure difference data;
and the cleaning reminding module is used for feeding back a predicted result of the time length to be cleaned to the management center to realize cleaning reminding of the filter screen and feeding back cleaning alarm.
And the management center is used for receiving and managing cleaning reminding of the filter screen in each ventilation device.
The beneficial effects of the invention are as follows:
1. the method comprises the steps of respectively collecting pollutant data and filter screen pressure difference data by arranging an air quality sensor and a pressure difference meter in ventilation equipment, checking the pollutant data and the filter screen pressure difference data with preset safety values, and determining whether cleaning prediction or other operations are needed by using a checking result; when the cleaning prediction operation is selected to be executed, the pollutant data and the differential pressure data are preprocessed and input into a filter screen cleaning prediction algorithm, the duration to be cleaned is predicted, and the prediction result is fed back to a management center, so that filter screen cleaning reminding and cleaning alarm reminding are realized; therefore, different data parameters can be monitored in a combined mode, the cleaning state of the filter screen can be judged more accurately, the cleaning duration is predicted, maintenance personnel are effectively reminded of taking necessary measures, the performance of ventilation equipment and the indoor air quality are maintained, and the health and comfort of the indoor environment are improved.
2. Establishing a model on the basis of historical data by constructing a filter screen cleaning prediction algorithm based on a historical database, taking pollutant data as an associated variable and pressure difference data as an independent variable, accurately predicting the filter screen cleaning duration, and inputting the pollutant data and the pressure difference data of the current verification period into the model to obtain a cleaning time prediction result; the filter screen maintenance is more timeliness and accuracy, so that the performance of the ventilation equipment is improved, the indoor air quality is ensured, the intelligent maintenance optimization effect is realized, and a higher level of guarantee is provided for the operation of the ventilation equipment and the indoor environment.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a flow chart of a filter screen cleaning reminding method based on safety value verification according to an embodiment of the invention;
fig. 2 is a system schematic diagram of a filter screen cleaning reminding system based on safety value verification according to an embodiment of the invention.
Reference numerals: 1. a filter screen monitoring module; 2. a security value checking module; 3. a cleaning prediction module; 4. a cleaning reminding module; 5. and a management center.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a filter screen cleaning reminding method based on safety value verification is provided, and the method comprises the following steps:
s1, an air quality sensor is arranged on the outer side of a filter screen of the ventilation equipment, and pollutant data are collected.
An air quality sensor is arranged outside a filter screen of the ventilation equipment. The sensors can measure various pollutants in the air, such as particulate matter (PM 2.5, PM 10), volatile Organic Compounds (VOCs), carbon dioxide (CO 2 ) Carbon monoxide (CO), and the like. By collecting contaminant data, the sensor can provide real-time information about the indoor air quality, help the user to understand the environmental conditions, and take timely action to maintain and improve the indoor air quality.
S2, setting differential pressure meters on two sides of the filter screen, and collecting differential pressure data on two sides of the filter screen.
The differential pressure meter can measure the gas differential pressure at two sides of the filter screen, namely the pressure difference between the air inlet side and the air outlet side of the ventilation system. Collecting differential pressure data across the filter screen can provide information about the degree of blockage and efficiency of the filter screen, helping to determine when the filter screen needs to be cleaned or replaced.
Differential pressure data is an important parameter that indicates the condition of the filter screen. Over time, the filter screen may become clogged by trapped particulate matter, resulting in a gradual increase in the pressure differential across the inlet and outlet sides. By monitoring the change of the pressure difference, whether the filter screen needs cleaning or replacement can be judged.
S3, setting safety values for the pollutant data and the differential pressure data respectively, checking the safety values, and selecting to execute operation of continuous monitoring, overhauling maintenance or cleaning prediction according to the checking result.
In the description of the present invention, safety values are set for contaminant data and differential pressure data, and safety value verification is performed, and operations for continuing monitoring, overhauling maintenance or cleaning prediction are selectively performed according to the verification result, including the following steps:
s31, setting an air quality safety value of pollutant data in the process of collection and monitoring.
The air quality safety value of the pollutant data is set to define a reasonable range of indoor air quality, and when the pollutant data exceeds the safety value, corresponding measures are needed to improve the indoor air environment. The setting of the safety value is typically based on relevant health standards, regulations or guidelines to ensure the health and comfort of people in an indoor environment.
S32, setting a differential pressure safety value of the differential pressure data in the process of acquisition and monitoring.
The differential pressure safety value of the differential pressure data is set to ensure the normal operation of the ventilation system and the effectiveness of the filter screen. By setting the pressure difference safety value, the blocking condition of the filter screen and the working state of the ventilation system can be early warned in advance.
S33, setting a unified check period for the air quality sensor and the differential pressure meter.
S34, checking the pollutant data and the differential pressure data according to the checking period.
In the description of the present invention, verifying the contaminant data and the differential pressure data according to a verification period includes the steps of:
s341, acquiring the values of pollutant data and differential pressure data in the current verification period, and judging the magnitude relation between the values and the air quality safety value and the differential pressure safety value respectively.
S342, if the pollutant data are smaller than the air quality safety value and the pressure difference data are smaller than the pressure difference safety value, judging that the verification result of the current verification period is normal.
S343, if the pollutant data is greater than or equal to the air quality safety value or the differential pressure data is greater than or equal to the differential pressure safety value, calculating the change rate of the pollutant data or the differential pressure data, and judging the size relation between the calculation result and the preset change rate safety value.
In the description of the present invention, calculating the rate of change of contaminant data or differential pressure data includes the steps of:
s3431, respectively calculating a sliding average value of pollutant data and pressure difference data detected in the last n check periods, wherein the sliding average value has a calculation formula:
in the method, in the process of the invention,x n indicating the latestnThe values of the contaminant data or differential pressure data over the individual verification cycles,MAindicating that contaminant data or differential pressure data was recentnA running average over each verification period.
S3432, setting a change rate safety value for the pollutant data and the differential pressure data respectively, and then calculating the change rate of the pollutant data and the differential pressure data in the current verification period, wherein a change rate calculation formula is as follows:
in the method, in the process of the invention,CRindicating the rate of change of the contaminant data or differential pressure data,x 0 a value representing contaminant data or differential pressure data during the current verification period.
And S344, if the change rate of the pollutant data or the differential pressure data in the current verification period is greater than or equal to the change rate safety value, judging that the verification result of the current verification period is abnormal.
S345, if the change rate of the pollutant data or the differential pressure data in the current verification period is smaller than the change rate safety value, judging that the verification result of the current verification period is to be cleaned.
And S35, if the verification result is normal, executing and continuing to monitor until the next verification period is verified.
If both the contaminant data and the differential pressure data are within safe values, indicating that the ventilation device is functioning properly, the next verification cycle may be continued to be monitored.
And S36, if the verification result is abnormal, overhauling and maintaining are carried out, and the abnormal condition is checked.
If the pollutant data or the differential pressure data exceeds the safety value, problems may occur, and overhauling and maintenance are needed to check abnormal conditions, so that the normal operation of the equipment is ensured.
And S37, if the verification result is to be cleaned, cleaning prediction is executed, and the duration to be cleaned is predicted.
If the contaminant data or differential pressure data exceeds a safe value, but the rate of change is low, it may be desirable to predict the timing of the filter screen cleaning to maintain performance of the device.
S4, when the cleaning prediction operation is selected to be executed, preprocessing pollutant data and differential pressure data, and inputting the pollutant data and differential pressure data into a filter screen cleaning prediction algorithm to predict the duration to be cleaned.
In the description of the present invention, when a cleaning prediction operation is selected to be performed, preprocessing contaminant data and differential pressure data, and inputting the preprocessed contaminant data and differential pressure data into a filter screen cleaning prediction algorithm to predict a cleaning time period includes the steps of:
s41, when the checking result is to be cleaned, integrating the current checking period and the latestnPollutant data and differential pressure data acquired in each verification period.
S42, acquiring pollutant data, pressure difference data and cleaning time data acquired in the historical operation process of the same type of ventilation equipment and the filter screen, and forming a historical database.
S43, preprocessing pollutant data and differential pressure data.
In the description of the present invention, preprocessing contaminant data and differential pressure data includes the steps of:
s431, sorting according to the time sequence of the verification period, and aligning the time stamp information between the two data sequences of the pollutant data and the differential pressure data.
S432, checking the integrity of pollutant data and differential pressure data respectively, and filling missing values in the two data sequences in a median mode.
Wherein, for missing values in the contaminant data and the differential pressure data, a median filling method can be adopted for processing. The method comprises the following specific steps:
for contaminant data, the median of all valid data is calculated and the missing values are filled in with the median.
For differential pressure data, the median of the effective data is also calculated and the missing values are filled in with the median.
S44, setting the highest limit value for the differential pressure data as a threshold value for cleaning the filter screen.
S45, using pollutant data as related variables, and establishing a filter screen cleaning prediction algorithm which takes differential pressure data as independent variables and is based on a historical database.
In the description of the present invention, the filter screen cleaning prediction algorithm which uses pollutant data as related variables, establishes differential pressure data as independent variables and is based on a historical database comprises the following steps:
s451, drawing a change curve of the differential pressure data in an initial check period to a current check period, and searching a historical change curve which is the same as the current differential pressure data in a historical database.
And drawing a change curve of the differential pressure data by using the collected differential pressure data and the time stamp. The abscissa may be time and the ordinate is the value of the differential pressure data. A graph is drawn using a data visualization tool (e.g., matplotlib, excel, etc.).
Searching historical data: and searching historical data similar to the current differential pressure data change curve in the historical database. Historical differential pressure data and corresponding time stamps are extracted, and a historical time period with the same length as the current verification period is covered. And constructing a historical change curve according to the historical pressure difference data with the same or smaller pressure difference data than the similar threshold value.
And calculating the similarity between the current differential pressure data change curve and the historical differential pressure data change curve, and measuring the similarity by using methods such as a correlation coefficient, euclidean distance and the like.
S452, using the pollutant data as a related variable affecting the change of the differential pressure data, and searching a predicted change curve most similar to the current filter screen in the history change curve.
In the description of the invention, using the pollutant data as the related variable affecting the change of the differential pressure data, searching the predicted change curve most similar to the current filter screen in the history change curve comprises the following steps:
s4521 to the nearest current verification periodnThe weight value w is given to each check period 1 To the nearestnAll check periods before the check period are given weight value w 2 And calculating the actual measurement weighted average of the pollutant data in the initial check period to the current check period.
S4522, acquiring historical pollutant data corresponding to the historical change curve and utilizing the historical pollutant data to the latestnThe historical weighted average is calculated in such a way that different weight values are assigned to each verification period.
And S4523, searching a historical weighted average closest to the numerical value of the actually measured weighted average in all the historical weighted averages, and taking a historical change curve corresponding to the historical weighted average as a prediction change curve.
S453, predicting the cleaning time of the current filter screen according to the cleaning time data stored in the prediction change curve, and taking the prediction result as the cleaning time of the filter screen.
In the description of the present invention, the cleaning time of the current filter screen is predicted according to the cleaning time data stored in the predicted change curve, and the predicted result is used as the duration to be cleaned of the filter screen, including the following steps:
s4531, acquiring coordinates of a node corresponding to current pressure difference data in the prediction change curve, and acquiring a period interval from the node to a node corresponding to the highest limit value.
S4532, converting the period interval between two nodes into a time value in combination with the check period, and taking the time value as the time length to be cleaned of the current filter screen. The method comprises the following specific steps:
obtaining the node coordinates of a predicted change curve: and on the predicted change curve, a node corresponding to the current differential pressure data is found, and coordinates of the node are acquired, wherein the coordinates comprise time and differential pressure data values.
Obtaining a highest limit value corresponding node: and on the predicted change curve, finding a node with the pressure difference data reaching the highest limit value, and acquiring the coordinates of the node, wherein the coordinates also comprise time and pressure difference data values.
Calculating a period interval: and calculating the period interval between the current pressure difference data corresponding node and the highest limit value corresponding node, namely the difference of the node numbers. Each node represents a check period.
Converting into a time value: the period interval is multiplied by the length of the verification period to obtain a time value representing the time required from the current time to the time required for the differential pressure data to reach the maximum limit.
S46, pollutant data and pressure difference data in the current verification period are used as input, and the filter screen cleaning prediction algorithm is utilized to predict the cleaning time.
S5, feeding back a predicted result of the duration to be cleaned to the management center to realize cleaning reminding of the filter screen, and feeding back cleaning alarm reminding when the duration to be cleaned is smaller than the cleaning safety limit value.
Referring to fig. 2, a filter screen cleaning reminding system based on safety value verification is also provided, and the system comprises: the system comprises a filter screen monitoring module 1, a safety value checking module 2, a cleaning prediction module 3, a cleaning reminding module 4 and a management center 5.
The filter screen monitoring module 1 is used for arranging an air quality sensor and a differential pressure meter on two sides of a filter screen of the ventilation equipment to collect pollutant data and differential pressure data.
The safety value verification module 2 is used for setting an air quality safety value and a pressure difference safety value, verifying the safety value of the pollutant data and the pressure difference data, and allocating and issuing an operation instruction.
And the cleaning prediction module 3 is used for running a filter screen cleaning prediction algorithm to predict the time length to be cleaned of the filter screen according to the historical database, the pollutant data and the pressure difference data.
And the cleaning reminding module 4 is used for feeding back the predicted result of the time length to be cleaned to the management center to realize filter screen cleaning reminding and feeding back cleaning alarm.
And the management center 5 is used for receiving and managing cleaning reminding of the filter screen in each ventilation device.
In summary, by means of the above technical solution of the present invention, by setting an air quality sensor and a differential pressure meter in a ventilation device, pollutant data and differential pressure data of a filter screen are respectively collected and checked with a preset safety value, and whether cleaning prediction or other operations are required is determined by using a check result; when the cleaning prediction operation is selected to be executed, the pollutant data and the differential pressure data are preprocessed and input into a filter screen cleaning prediction algorithm, the duration to be cleaned is predicted, and the prediction result is fed back to a management center, so that filter screen cleaning reminding and cleaning alarm reminding are realized; therefore, different data parameters can be monitored in a combined mode, the cleaning state of the filter screen can be judged more accurately, the cleaning duration is predicted, maintenance personnel are effectively reminded of taking necessary measures, the performance of ventilation equipment and the indoor air quality are maintained, and the health and comfort of the indoor environment are improved. Establishing a model on the basis of historical data by constructing a filter screen cleaning prediction algorithm based on a historical database, taking pollutant data as an associated variable and pressure difference data as an independent variable, accurately predicting the filter screen cleaning duration, and inputting the pollutant data and the pressure difference data of the current verification period into the model to obtain a cleaning time prediction result; the filter screen maintenance is more timeliness and accuracy, so that the performance of the ventilation equipment is improved, the indoor air quality is ensured, the intelligent maintenance optimization effect is realized, and a higher level of guarantee is provided for the operation of the ventilation equipment and the indoor environment.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the flowcharts of the figures may include a plurality of sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily being sequential, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
Claims (5)
1. The filter screen cleaning reminding method based on the safety value verification is characterized by comprising the following steps of:
s1, arranging an air quality sensor outside a filter screen of ventilation equipment, and collecting pollutant data;
s2, setting differential pressure meters on two sides of the filter screen, and collecting differential pressure data on two sides of the filter screen;
s3, setting safety values for the pollutant data and the differential pressure data respectively, checking the safety values, and selecting to execute operation of continuous monitoring, overhauling maintenance or cleaning prediction according to a checking result;
s4, when the cleaning prediction operation is selected to be executed, preprocessing the pollutant data and the pressure difference data, and inputting the pollutant data and the pressure difference data into a filter screen cleaning prediction algorithm to predict the duration to be cleaned;
s5, feeding back a predicted result of the duration to be cleaned to a management center to realize cleaning reminding of the filter screen, and feeding back cleaning alarm reminding when the duration to be cleaned is smaller than a cleaning safety limit value;
the operation of continuously monitoring, overhauling, maintaining or cleaning and predicting is selected according to the verification result, and comprises the following steps:
s31, setting an air quality safety value of the pollutant data in the process of acquisition and monitoring;
s32, setting a differential pressure safety value of the differential pressure data in the process of acquisition and monitoring;
s33, setting a unified check period for the air quality sensor and the differential pressure meter;
s34, checking the pollutant data and the pressure difference data according to the checking period;
s35, if the verification result is normal, executing and continuing to monitor until the next verification period is verified;
s36, if the verification result is abnormal, overhauling and maintaining are carried out, and abnormal conditions are checked;
s37, if the verification result is to be cleaned, cleaning prediction is executed, and the duration to be cleaned is predicted;
when the cleaning prediction operation is selected to be executed, preprocessing the pollutant data and the pressure difference data, and inputting the pollutant data and the pressure difference data into a filter screen cleaning prediction algorithm for predicting the duration to be cleaned, wherein the method comprises the following steps of:
s41, when the checking result is to be cleaned, integrating the current checking period and the latestnThe pollutant data and the pressure difference data acquired in the verification period;
s42, acquiring pollutant data, pressure difference data and cleaning time data acquired in the same type of ventilation equipment and the filter screen historical operation process to form a historical database;
s43, preprocessing the pollutant data and the differential pressure data;
s44, setting a highest limit value for the differential pressure data as a threshold value for cleaning the filter screen;
s45, establishing a filter screen cleaning prediction algorithm which takes the pollutant data as an associated variable, takes the pressure difference data as an independent variable and takes the history database as a basis;
s46, taking the pollutant data and the pressure difference data in the current verification period as input, and predicting the cleaning duration by using the filter screen cleaning prediction algorithm;
the filter screen cleaning prediction algorithm taking the pollutant data as an associated variable, the differential pressure data as an independent variable and the history database as a base comprises the following steps of:
s451, drawing a change curve of the differential pressure data in an initial check period to a current check period, and searching a historical change curve which is the same as the current differential pressure data in the historical database;
s452, taking the pollutant data as a related variable affecting the change of the differential pressure data, and searching a predicted change curve most similar to the current filter screen in the historical change curve;
s453, predicting the current cleaning time of the filter screen according to the cleaning time data stored in the prediction change curve, and taking the prediction result as the duration of the filter screen to be cleaned;
the method for searching the predicted change curve most similar to the current filter screen in the historical change curve by taking the pollutant data as the related variable affecting the change of the differential pressure data comprises the following steps of:
s4521 to the nearest current verification periodnGiving weight value w to each checking period 1 To the nearestnAll the check periods before each check period are given weight value w 2 Calculating an actual measurement weighted average of the pollutant data in the initial check period to the current check period;
s4522, acquiring historical pollutant data corresponding to the historical change curve, and utilizing the historical pollutant data to the latestnCalculating historical weighted average in a mode of giving different weight values to each verification period;
s4523, searching the historical weighted average closest to the numerical value of the measured weighted average in all the historical weighted averages, and taking the historical change curve corresponding to the historical weighted average as a prediction change curve;
predicting the current cleaning time of the filter screen according to the cleaning time data stored in the prediction change curve, and taking the prediction result as the cleaning time length of the filter screen, wherein the method comprises the following steps of:
s4531, acquiring coordinates of a node corresponding to the current differential pressure data in the prediction change curve, and acquiring a period interval between the node and a node corresponding to the highest limit value;
s4532, converting the period interval between two nodes into a time value in combination with the verification period, and taking the time value as the current time length of the filter screen to be cleaned.
2. The filter screen cleaning reminding method based on safety value verification according to claim 1, wherein the verification of the pollutant data and the pressure difference data according to the verification period comprises the following steps:
s341, acquiring the numerical values of the pollutant data and the differential pressure data in the current verification period, and judging the size relationship between the numerical values and the air quality safety value and the differential pressure safety value respectively;
s342, if the pollutant data are smaller than the air quality safety value and the pressure difference data are smaller than the pressure difference safety value, judging that the verification result of the current verification period is normal;
s343, if the pollutant data is greater than or equal to the air quality safety value or the pressure difference data is greater than or equal to the pressure difference safety value, calculating the change rate of the pollutant data or the pressure difference data, and judging the magnitude relation between the calculation result and a preset change rate safety value;
s344, if the change rate of the pollutant data or the pressure difference data in the current verification period is greater than or equal to the change rate safety value, judging that the verification result of the current verification period is abnormal;
s345, if the change rate of the pollutant data or the pressure difference data in the current verification period is smaller than the change rate safety value, judging that the verification result of the current verification period is to be cleaned.
3. The filter screen cleaning reminding method based on safety value verification according to claim 2, wherein the calculating of the change rate of the pollutant data or the differential pressure data comprises the following steps:
s3431, acquiring the pollutant data and the pressure difference data detected in the last n check periods, and respectively calculating a sliding average value, wherein a calculation formula of the sliding average value is as follows:；
in the method, in the process of the invention,x n indicating the latestnThe number of contaminant data or differential pressure data over a number of verification cycles;
MAindicating that contaminant data or differential pressure data was recentnA running average over each verification period;
s3432, setting a change rate safety value for the pollutant data and the pressure difference data respectively, and then calculating the change rate of the pollutant data and the pressure difference data in the current verification period, wherein a change rate calculation formula is as follows:；
in the method, in the process of the invention,CRrepresenting a rate of change of the contaminant data or the differential pressure data;
x 0 a value representing contaminant data or differential pressure data during the current verification period.
4. A method of filter screen cleaning reminder based on a safe value check as recited in claim 3, wherein the preprocessing of the contaminant data and the differential pressure data comprises the steps of:
s431, sorting according to the time sequence of the verification period, and aligning the time stamp information between the two data sequences of the pollutant data and the differential pressure data;
s432, checking the integrity of the pollutant data and the integrity of the differential pressure data respectively, and filling missing values in the two data sequences in a median mode.
5. A filter screen cleaning reminding system based on a security value check, for implementing the filter screen cleaning reminding method based on the security value check as claimed in any one of claims 1 to 4, characterized in that the system comprises: the system comprises a filter screen monitoring module, a safety value checking module, a cleaning prediction module, a cleaning reminding module and a management center;
the filter screen monitoring module is used for arranging an air quality sensor and a differential pressure meter on two sides of a filter screen of the ventilation equipment to collect pollutant data and differential pressure data;
the safety value verification module is used for setting an air quality safety value and a pressure difference safety value, verifying the safety value of the pollutant data and the pressure difference data, and allocating and issuing an operation instruction;
the cleaning prediction module is used for running a filter screen cleaning prediction algorithm to predict the time length to be cleaned of the filter screen according to the historical database, the pollutant data and the pressure difference data;
the cleaning reminding module is used for feeding back the predicted result of the duration to be cleaned to a management center to realize cleaning reminding of the filter screen and feeding back cleaning alarm;
the management center is used for receiving and managing cleaning reminding of the filter screen in each ventilation device.
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