CN107883538A - Method and device for determining service life of filter screen and air purification equipment thereof - Google Patents

Abstract

The present invention relates to the field of gas metering technology, and specifically to a method and device for measuring the purification amount of a filter, a method and device for determining the service life of a filter, air purification equipment and a non-transient computer-readable storage medium. The method for measuring the purification amount of the filter includes obtaining the concentration of substances in the air in a current time period and the actual air volume passing through the filter, wherein the actual air volume is obtained based on the theoretical air volume and the cumulative purification amount of the filter before the current time period; obtaining the purification amount of the current time period based on the concentration of substances in the air in the current time period and the actual air volume; summing the purification amount of the current time period and the cumulative purification amount before the current time period, thereby avoiding errors in the actual air volume value due to the filling of the filter with pollutants, and accurately calculating the purification amount of the filter.

Description

Method and device for determining service life of filter screen and air purification equipment thereof

technical field

The invention relates to the technical field of gas metering, in particular to a method and device for measuring the purification amount of a filter screen, a method and device for determining the service life of a filter screen, air purification equipment, and a non-transient computer-readable storage medium.

Background technique

At present, for air purification equipment, the existing air purification equipment generally uses filters to purify the air. These filters have a certain service life. After the air purification equipment is used for a certain period, the filter will gradually be filtered from the air. When the pollutants are full, the life of the filter screen is over. If it is used again, the filter screen will lose its air purification performance. At this time, the filter screen needs to be replaced.

As for when to replace the filter screen, some filters have a fixed life, for example, the preset life of the filter screen is one year, and the filter screen will be replaced after one year of use; some use the cumulative calculation of the filter screen usage time After the filter is turned on and used for a certain period of time, the filter will be replaced when the preset hour life is reached. However, due to the different environments in which the filter is used and the quality of the air is different, the actual life of the filter is not exactly the same as the fixed or estimated life, and the error is large.

In this regard, the prior art provides a method for measuring substances in the air, by measuring the concentration C of substances in the air in each sampling period T, and measuring the air flow rate V passing through the fixed channel in the period T, and passing the air The concentration C of the substance in the air and the air flow rate are used to calculate the weight W of the substance in the air during the period, and the weight W value is accumulated and summed to obtain the total mass of the substance passing through the channel within a certain period of time. The total mass is compared with the predetermined mass of adsorbable substances in the filter screen, so that the life of the filter screen can be accurately measured.

Although the above measurement method can be used to further accurately measure the life of the filter screen, there are still the following problems: the measurement of the air flow V in the above parameters is by setting the wind speed sensor in the passage between the air inlet and the air outlet. , obtained by calculating the product of the wind speed and the area of the channel, but in actual use, because the filter screen is set in the channel to play a blocking role, the ventilation cross-sectional area of the channel decreases first and then decreases from the air inlet to the air outlet. Large process, and as the filter is used, the filter is filled with pollutants filtered from the air, the cross-sectional area of the screen ventilation will still change continuously, that is, the actual ventilation cross-sectional area in the channel is not a constant value , which leads to inaccurate calculation of the air flow V value, which in turn affects the accurate measurement of the life of the filter screen.

Contents of the invention

The main purpose of the present invention is to provide a method, device and air purification equipment for measuring substances in the air, so as to solve the problem that the service life of the filter screen cannot be accurately measured in the prior art.

In order to achieve the above object, the present invention provides a method for measuring the purification amount of the filter screen, including:

Acquire the concentration of substances in the air within the current time period and the actual air volume passing through the filter, the actual air volume is obtained according to the theoretical air volume and the accumulated purification volume of the filter before the current time period;

Acquiring the purification amount of the current time period according to the concentration of substances in the air within the current time period and the actual air volume;

summing the purification amount in the current time period and the accumulated purification amount before the current time period to obtain the accumulated purification amount in the current time period.

Further, it also includes a database that establishes the corresponding relationship between the actual air volume and the cumulative purification amount of pollutants in the purifier under different theoretical air volumes. The purification amount is obtained from the database.

The present invention also provides a method for determining the service life of the filter screen, including:

Obtain the cumulative purification amount of the filter according to the metering method of the purification amount of the filter as described above;

judging whether the difference between the theoretical purification amount of the filter screen and the cumulative purification amount of the filter screen is less than a predetermined threshold;

When the difference between the theoretical purification amount of the filter screen and the cumulative purification amount of the filter screen is less than a predetermined threshold, it is determined that the filter screen has reached the service life.

The present invention also provides a metering device for the purification amount of the filter screen, comprising:

The concentration and air volume acquisition unit is used to acquire the concentration of substances in the air within the current time period and the actual air volume passing through the filter, the actual air volume is based on the theoretical air volume and the cumulative purification of the filter before the current time period Quantitatively obtained;

A purification amount acquisition unit, configured to acquire the purification amount of the current time period according to the concentration of substances in the air within the current time period and the actual air volume;

A summing unit, configured to sum the purification amount in the current time period and the accumulated purification amount before the current time period to obtain the accumulated purification amount in the current time period.

Further, it also includes a database establishment unit, which is used to establish a database corresponding to the actual air volume and the cumulative purification amount of pollutants in the purifier under different theoretical air volumes. The actual air volume is based on the theoretical air volume and the filter screen in the The cumulative purification amount before the current time period is obtained from the database.

The present invention also provides a device for determining the service life of the filter screen, including:

According to the metering device for the purification amount of the filter screen as described above, it is used to obtain the cumulative purification amount of the filter screen;

A judging unit, configured to judge whether the difference between the theoretical purification amount of the filter screen and the cumulative purification amount of the filter screen is less than a predetermined threshold;

A calculating unit, configured to determine that the filter has reached the service life when the difference between the theoretical purification amount of the filter and the cumulative purification amount of the filter is less than a predetermined threshold.

The present invention also provides an air purification device, comprising:

The substance concentration sensor is used to obtain the substance concentration in the air within the current time period;

The theoretical air volume acquisition device is used to acquire the theoretical air volume passing through the filter screen of the air purification device within the current time period;

A processor, configured to obtain the actual air volume passing through the filter in the current time period according to the theoretical air volume and the accumulated purification volume of the filter before the current time period, and according to the air volume in the current time period The substance concentration and the actual air volume obtain the purification amount of the current time period, and sum the purification amount of the current time period and the accumulated purification amount before the current time period to obtain the cumulative purification amount of the current time period Purification amount.

Further, the theoretical air volume acquisition device is a gear gauge, wherein different gear positions of the gear gauge correspond to different air volumes.

Further, the theoretical air volume acquisition device is an air volume sensor.

Further, the air purification device further includes an information sending unit, configured to output the cumulative purification amount data in the current time period obtained by summing up the processor.

Further, the air purification device further includes a display unit for displaying the summed purification amount.

Further, the air purification device further includes a reminder unit, configured to prompt replacement of the filter when the difference between the theoretical purification amount of the filter and the cumulative purification amount of the filter is less than a predetermined threshold.

Further, the prompt unit is a speaker, a buzzer or a flasher.

The present invention also provides a non-transitory computer-readable storage medium, the non-transitory computer-readable storage medium stores computer instructions, and the computer instructions are used to cause the computer to execute the above-mentioned method.

The technical solution of the present invention has the following advantages:

1. In the metering method and device of the filter screen purification capacity provided by the present invention, by obtaining the substance concentration in the air in the current time period and the actual air volume passing through the filter screen, the actual air volume value is based on the theoretical air volume and the filter screen The cumulative purification volume before the current time period is obtained, which avoids the error of the actual air volume value due to the filling of filter screen pollutants, and then can accurately calculate the purification volume of the filter screen, and the user can clearly and accurately understand the use of the current filter screen At the same time, the actual air volume value only needs to be extracted according to the theoretical air volume value and the accumulated purification volume before the current time period. In practical applications, there is no need to set up a separate complex measuring device for measurement, which simplifies the measurement structure and operation steps.

2. In the method and device for determining the service life of the filter screen provided by the present invention, since the metering method of the purification amount of the filter screen in the present invention is adopted, the purification amount of the filter screen can be accurately calculated, and the user can clearly and accurately understand the current The service life of the filter screen, at the same time, it is not necessary to set up a separate complex measuring device for measurement in practical applications, which simplifies the measurement structure and operation steps.

3. In the air purification equipment provided by the present invention, the purification amount of the filter screen in the equipment can be accurately calculated, and the user can accurately and intuitively understand the life of the current filter screen, and replace the filter screen in a timely manner. For example, you can directly download the relevant APP, measure the concentration of substances in the air during the current time period, the theoretical air volume, and the cumulative purification volume before the current time period, and combine the APP to calculate. The measurement structure and operation steps are simplified, and the cost of air purification equipment is reduced.

4. In the non-transitory computer-readable storage medium provided by the present invention, due to the adoption of the metering method of the purification capacity of the filter screen and the determination method of the service life of the filter screen in the present invention, the purification capacity of the filter screen can be accurately calculated, and the user It can clearly and accurately understand the life of the current filter screen, and at the same time, it is not necessary to set up a separate complicated measuring device for measurement in practical applications, which simplifies the measurement structure and operation steps.

Description of drawings

In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the specific implementation or description of the prior art. Obviously, the accompanying drawings in the following description The drawings show some implementations of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work. In the attached picture:

Fig. 1 is the schematic flow sheet of the metering method of filter screen purification amount in embodiment 1 of the present invention;

Fig. 2 is a corresponding relationship diagram between the actual air volume and the cumulative purification amount of pollutants in the purifier under high-grade air volume;

Fig. 3 is a schematic flow chart of a method for determining the service life of the filter screen in Embodiment 2 of the present invention;

Fig. 4 is a schematic structural view of a metering device for the purification amount of the filter screen in Example 3 of the present invention;

FIG. 5 is a schematic structural view of a device for determining the service life of the filter screen in Embodiment 4 of the present invention;

Fig. 6 is a schematic diagram of the connection of the processor in the air purification device.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

This embodiment provides a method for measuring the purification amount of the filter screen, for example, it can be used to measure the purification amount of the filter screen of the air purification equipment, as shown in Figure 1, the method may include:

S11: Obtain the concentration of substances in the air within the current time period and the actual air volume passing through the filter, the actual air volume is obtained according to the theoretical air volume and the accumulated purification volume of the filter before the current time period.

In this embodiment, the substance concentration in the air can be obtained by measuring the substance concentration sensor, and the substance concentration sensor is arranged at the air inlet before the filter screen to ensure the accuracy of the measurement data. The theoretical air volume can be obtained by using conventional air volume measurement methods in the prior art, for example, by setting the wind speed sensor in the channel between the air inlet and the air outlet, and calculating the product of the wind speed and the area of the channel. It can also be that different air volume gears have been established in advance, such as low wind, middle wind, and high wind, and the theoretical air volume of each wind can be fixed.

For obtaining the actual air volume, for example, it can be obtained by looking up tables, empirical formulas, mathematical models, and the like. The following uses table lookup as an example to describe the embodiment of the present invention in detail.

As shown in Figure 2, specifically, for the same type of filter screen, by pre-establishing the database of the corresponding relationship between the actual air volume and the cumulative purification amount of pollutants in the purifier under different theoretical air volumes, it can be generated as shown in Figure 2 A database composed of charts, the actual air volume is obtained from the database according to the theoretical air volume and the cumulative purification volume of the filter before the current time period, that is, it does not need to be connected to the outside world, and through its own database, it can be obtained according to The theoretical air volume and the cumulative purification volume before the current time period obtain the actual air volume, which is more independent.

Establish a database by storing charts under different theoretical air volumes, such as writing relevant charts, correspondence and other data into the single-chip microcomputer, and then in the current time period, by obtaining the theoretical air volume in the current time period and obtaining the corresponding purification The cumulative purification amount of pollutants in the device allows the corresponding actual air volume to be extracted from charts, models or formulas. Since the corresponding relationship can be pre-measured in the laboratory, accurate actual air volume data can be extracted to compare the theoretical air volume. correct.

For how to generate the graph shown in Figure 2, that is to obtain the corresponding relationship between the actual air volume and the cumulative purification amount of pollutants in the purifier under different theoretical air volumes. It can be obtained by conventional techniques in the laboratory. For example, the same type of filter screen in the laboratory is tested using the conventional test device in GB/T1236. The test device mainly includes: air duct system, pollution source generating device (the air volume test does not need this function) and measuring device 3 parts. The test method is: generally use a standard orifice plate or a standard nozzle and other throttling devices to connect with a micromanometer for measurement. For the installation of the specific test device and the test calculation method, refer to GB/T1236. Put the tested machine into the standard position of the air duct system, adjust the tested machine to the tested state, turn on the fan at the end of the test device, observe the micromanometer readings upstream and downstream of the tested purifier, and calculate its air volume. Its calculation formula is:

Qv=Qm/ρ

Qm＝α*ξ*π*d2/4*√2ρu*△ρ

Qv: air volume

Qm: mass flow rate

ρ: air density

α: flow coefficient of the flowmeter

ξ: coefficient of expansion

d: Orifice or nozzle diameter

ρu: Absolute pressure upstream of the machine under test

△ρ: pressure difference between upstream and downstream

For the above specific calculation algorithm and how to realize the measurement, please refer to GB/T1236 for details, and will not repeat them here.

The above method can be used to obtain the corresponding relationship between the actual air volume and the cumulative purification amount of pollutants in the purifier under a certain theoretical air volume, and then obtain the accurate real value of the actual air volume. The database of the corresponding relationship of the cumulative purification amount of pollutants in the filter, when necessary to obtain the actual air volume passing through the filter, only need to input the obtained parameters.

S12: Obtain the purification amount of the current time period according to the concentration of substances in the air during the current time period and the actual air volume. In this embodiment, the cumulative purification amount of the filter before the current time period can be obtained directly from the storage device, and the initial value of the cumulative purification amount of the filter used for the first time is zero . After completing the acquisition of the concentration of substances in the air and the actual air volume in the current time period, the purification capacity of the filter screen in the current time period can be calculated, and the product of the concentration of substances in the air, the actual air volume and the current time period is The purification amount of the filter in the current time period.

For the current time period, it may be 1 minute, 1 hour, or a day, etc., depending on the required accuracy. The shorter the current time period, the higher the accuracy. The time period for each measurement can be the same or different.

S13: Summing the purification amount in the current time period and the accumulated purification amount before the current time period to obtain the accumulated purification amount in the current time period.

By obtaining the concentration of substances in the air in the current time period and the actual air volume passing through the filter, the actual air volume value is obtained according to the theoretical air volume and the cumulative purification volume of the filter before the current time period, avoiding the actual air volume Value error due to the filling of pollutants in the filter screen, and then the purification amount of the filter screen can be accurately calculated, and the user can clearly and accurately understand the current use of the filter screen, and the actual air volume value can only be obtained according to the theoretical air volume value and the current time It is only necessary to extract the data from the accumulated purification amount before the section. In practical applications, there is no need to set up a separate complex measuring device for measurement, which simplifies the measurement structure and operation steps.

Example 2

As shown in Figure 3, this embodiment provides a method for determining the service life of the filter screen, including:

S21: Obtain the cumulative purification amount of the filter according to the metering method of the purification amount of the filter described in Embodiment 1;

S22: Judging whether the difference between the theoretical purification amount of the filter screen and the accumulated purification amount of the filter screen is less than a predetermined threshold, when the difference between the theoretical purification amount of the filter screen and the cumulative purification amount of the filter screen When the value is less than the predetermined threshold, step S23 is executed, and when the difference between the theoretical purification amount of the filter and the accumulated purification amount of the filter is not less than the predetermined threshold, step S24 is executed.

In step S23: it is determined that the filter screen has reached its service life, and it is determined that the filter screen has reached its service life.

At step 24: no action.

The theoretical purification capacity of the filter is pre-measured. For example, a filter can purify 50,000mg. If it exceeds this amount, the performance of the filter will be greatly reduced, affecting normal use. The predetermined threshold is, for example, It can be set to 1000 mg; when the difference between the theoretical purification amount of the filter screen and the cumulative purification amount of the filter screen is less than a predetermined threshold, for example, when the theoretical purification amount of the filter screen and the cumulative purification amount of the filter screen When the difference between the amounts is less than 1000mg, it is determined that the filter screen has reached its service life.

Using the above method, the purification amount of the filter can be accurately calculated, and the user can clearly and accurately understand the life of the current filter. At the same time, there is no need to set up a separate complicated measuring device for measurement in practical applications, which simplifies the measurement structure and operation steps. .

Example 3

As shown in Figure 4, the present embodiment provides a metering device for filter net cleaning capacity, including:

Concentration and air volume acquisition unit 41, used to acquire the concentration of substances in the air within the current time period and the actual air volume passing through the filter screen, the actual air volume is based on the theoretical air volume and the accumulation of the filter screen before the current time period The purification amount is obtained, for details, please refer to the description of step S11 in Example 1;

The purification amount acquisition unit 42 is used to obtain the purification amount of the current time period according to the concentration of substances in the air in the current time period and the actual air volume, for details, please refer to the description of step S12 in Embodiment 1;

The summing unit 43 is configured to sum the purification amount in the current time period and the cumulative purification amount before the current time period, for details, please refer to the description of step S13 in Embodiment 1.

Furthermore, in this embodiment, the passing concentration and air volume acquisition unit of the metering device for filter screen purification volume acquires the concentration of substances in the air in the current time period and the actual air volume that passes through the filter screen, and obtains the current time through the purification volume acquisition unit The purification amount of the segment, and sum the purification amount of the current time period and the cumulative purification amount before the current time period through the summation unit, because the actual air volume value is based on the theoretical air volume and the filter screen in the current time period The cumulative purification volume before the time period is obtained, which avoids the error of the actual air volume value due to the filling of filter screen pollutants, and then can accurately calculate the purification volume of the filter screen, and the user can clearly and accurately understand the current use of the filter screen.

Further, the metering device for the purification amount of the filter screen also includes a database establishment unit, which is used to establish a database of the corresponding relationship between the actual air volume and the cumulative purification volume of pollutants in the purifier under different theoretical air volumes. The actual air volume is based on the theoretical The air volume and the cumulative purification volume of the filter before the current time period are obtained from the database, and the metering device for the purification volume of the filter does not need to be connected to the outside world, and can be calculated according to the theoretical air volume through its own database. The actual air volume is obtained from the cumulative purification volume before the current time period, and the independence of the device is stronger. It is understandable that the actual air volume may also be obtained from a remote server through a remote connection.

Example 4

As shown in Figure 5, this embodiment provides a device for determining the service life of the filter screen, including:

The metering device 91 of the filter screen purification amount, for example, can be the metering device of the filter screen purification amount described in embodiment 3;

A judging unit 92, configured to judge whether the difference between the theoretical purification amount of the filter screen and the cumulative purification amount of the filter screen is less than a predetermined threshold;

The calculation unit 93 is configured to determine that the filter has reached the service life when the difference between the theoretical purification amount of the filter and the cumulative purification amount of the filter is less than a predetermined threshold.

When the difference between the theoretical purification capacity of the filter and the cumulative purification capacity of the filter is less than a predetermined threshold, for example, when the difference between the theoretical purification capacity of the filter and the cumulative purification capacity of the filter When it is less than 1000 mg, it is determined that the service life of the filter screen is up to determine that the filter screen has reached the service life.

Using the above method, the purification amount of the filter can be accurately calculated, and the user can clearly and accurately understand the life of the current filter. At the same time, there is no need to set up a separate complicated measuring device for measurement in practical applications, which simplifies the measurement structure and operation steps. .

Example 5

Referring to Figure 6, this embodiment provides an air purification device, including a device body, and the air purification device also includes:

The substance concentration sensor 501 is used to obtain the substance concentration in the air within the current time period;

The theoretical air volume obtaining means 504 is configured to obtain the theoretical air volume passing through the filter screen of the air purification device within the current time period. Wherein, the device for acquiring the theoretical air volume may be a gear gauge, wherein different gear positions of the gear gauge correspond to different air volumes, for example, corresponding to 600 cubic meters per hour, 400 cubic meters per hour, and so on. It may be an air volume sensor, which is arranged at the air inlet of the main body of the device, and is used to obtain the theoretical air volume in the current time period.

Memory 503, storing instructions;

Processor 502, configured to obtain the actual air volume passing through the filter in the current time period according to the theoretical air volume in the current time period and the cumulative purification amount of the filter before the current time period, and according to the air volume in the current time period The concentration of substances in the current time period and the actual air volume obtain the purification amount of the current time period, and sum the purification amount of the current time period and the cumulative purification amount before the current time period to obtain the current time period cumulative amount of purification.

The memory 503 can be used to store software programs and modules, and the processor executes various functional applications and data processing of the electronic device by running the software programs and modules stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application program required by a function (such as a sound playback function, an image playback function, etc.); Data created by the use of the device (such as audio data, phonebook, etc.), etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage devices.

The processor 502 is the control center of the electronic equipment, and uses various interfaces and lines to connect various parts of the entire electronic equipment. By running or executing software programs and/or modules stored in the memory, and calling data stored in the memory, execution Various functions and processing data of electronic devices. Optionally, the processor may include one or more processing units; preferably, the processor may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface and application programs, etc., and the modulation The demodulation processor mainly handles wireless communication. It can be understood that the foregoing modem processor may not be integrated into the processor.

Using the above-mentioned air purification equipment, the purification amount of the filter in the equipment can be accurately calculated, and the user can accurately and intuitively understand the life of the current filter, and replace the filter in a timely manner. The measurement device performs measurement, which simplifies the measurement structure and operation steps, and reduces the cost of the air purification equipment.

Preferably, the substance concentration sensor is arranged at the air inlet of the main body of the device, thereby ensuring measurement accuracy.

Preferably, the air volume sensor is arranged at the air inlet of the main body of the device, so as to measure a stable air volume and ensure the accuracy of subsequent calculations.

Preferably, the air purification device in this embodiment may further include a display unit, which is used to display the purification amount obtained by the summation, so as to clearly display the filtering condition and service life of the filter, which improves the user experience.

Preferably, the air purification device may further include a prompting unit for prompting to replace the filter screen when the difference between the theoretical purification amount of the filter screen and the cumulative purification amount of the filter screen is less than a predetermined threshold value, so The prompt unit is a loudspeaker, a buzzer or a flasher, which can remind the user to replace the filter screen in time, and the user experience is higher.

In a modified embodiment of the present invention, the air purification device further includes an information sending unit, configured to output the cumulative purification amount data in the current time period obtained by summing the processor to the mobile device. In addition, it can be viewed remotely, using mobile devices, such as mobile phones and tablet screens to obtain the filter status and life of the filter, and the vibration and speakers of the mobile device can be used to remind the user to replace the filter in time, so that the air purification equipment can be omitted. The unique display unit and prompt unit save the cost of air purification equipment.

Those skilled in the art can understand that all or part of the processes in the methods of the above-mentioned embodiments can be completed by instructing related hardware through computer programs, and the programs can be stored in a computer-readable storage medium. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM) and the like.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (14)

1. A kind of 1. metering method of filter screen purge amount, it is characterised in that including：

   Obtain the material concentration in current slot in air and the actual air volume by the filter screen, the actual air volume root Obtained according to accumulative purge amount of the theoretical air quantity with the filter screen before the current slot；

   Material concentration and the actual air volume in air in the current slot obtain the net of the current slot Change amount；

   The purge amount and the accumulative purge amount before the current slot of the current slot are summed to obtain State the accumulative purge amount of current slot.
2. 2. the metering method of filter screen purge amount according to claim 1, it is characterised in that including：

   Establish under different theories air quantity, actual air volume adds up the data of the corresponding relation of purge amount with pollutant in clarifier Storehouse, the actual air volume is according to theoretical air quantity and accumulative purge amount of the filter screen before the current slot from the number According to being acquired in storehouse.
3. A kind of 3. determination method of filter screen service life, it is characterised in that including：

   The metering method of filter screen purge amount according to claim 1 or 2 obtains the accumulative purge amount of the filter screen；

   Judge whether the difference between the theoretical purge amount of the filter screen and the accumulative purge amount of the filter screen is less than predetermined threshold；

   When the difference between the theoretical purge amount of the filter screen and the accumulative purge amount of the filter screen is less than predetermined threshold, it is determined that The filter screen reaches service life.
4. A kind of 4. metering device of filter screen purge amount, it is characterised in that including：

   Concentration and air quantity acquiring unit, for obtaining material concentration in current slot in air and by the filter screen Actual air volume, the actual air volume obtain according to accumulative purge amount of the theoretical air quantity with the filter screen before the current slot Arrive；

   Purge amount acquiring unit, obtained for the material concentration in air in the current slot and the actual air volume The purge amount of the current slot；

   Sum unit, carried out for the accumulative purge amount before the purge amount to the current slot and the current slot Sum to obtain the accumulative purge amount of the current slot.
5. 5. the metering device of filter screen purge amount according to claim 4, it is characterised in that also include：

   Database unit, for establishing under different theories air quantity, actual air volume and the accumulative purification of pollutant in clarifier The database of the corresponding relation of amount, the actual air volume is according to theoretical air quantity and the filter screen before the current slot Accumulative purge amount acquires out of described database.
6. A kind of 6. determining device of filter screen service life, it is characterised in that including：

   The metering device of filter screen purge amount according to claim 4 or 5, for obtaining the accumulative purge amount of the filter screen；

   Judging unit, for whether judging the difference between the theoretical purge amount of the filter screen and the accumulative purge amount of the filter screen Less than predetermined threshold；

   Computing unit, for being less than in advance when the difference between the theoretical purge amount of the filter screen and the accumulative purge amount of the filter screen When determining threshold value, determine that the filter screen reaches service life.
7. 7. a kind of air cleaning facility, including：

   Material concentration sensor, for obtaining the material concentration in current slot in air；

   Theoretical air quantity acquisition device, for obtaining the theoretical wind of the filter screen in current slot by the air cleaning facility Amount；

   Processor, for being obtained according to accumulative purge amount of the theoretical air quantity with the filter screen before the current slot By the actual air volume of the filter screen in current slot, material concentration in air in the current slot and described Actual air volume obtains the purge amount of the current slot, and the purge amount to the current slot and the current slot Accumulative purge amount before is summed to obtain the accumulative purge amount of the current slot.
8. 8. air cleaning facility according to claim 7, it is characterised in that the theoretical air quantity acquisition device is gear Meter, wherein the different stalls of the gear meter correspond to different air quantity.
9. 9. air cleaning facility according to claim 7, it is characterised in that the theoretical air quantity acquisition device is that air quantity passes Sensor.
10. 10. air cleaning facility according to claim 7, it is characterised in that the air cleaning facility also includes information Transmitting element, the accumulative purge amount data of the current slot for summing to obtain the processor are exported.
11. 11. air cleaning facility according to claim 7, it is characterised in that the air cleaning facility also includes display Unit, the purge amount obtained for showing summation.
12. 12. air cleaning facility according to claim 7, it is characterised in that the air cleaning facility also includes prompting Unit, for being less than predetermined threshold when the difference between the theoretical purge amount of the filter screen and the accumulative purge amount of the filter screen When, prompt to change filter screen.
13. 13. air cleaning facility according to claim 12, it is characterised in that the Tip element is loudspeaker, buzzing Device or flasher.
14. 14. a kind of non-transient computer readable storage medium storing program for executing, the non-transient computer readable storage medium storing program for executing storage computer refers to Order, it is characterised in that the computer instruction is used to make the side any one of the computer perform claim requirement 1 to 3 Method.