CN117919863A - Dust collection method for fume hood, electronic equipment and storage medium - Google Patents

Abstract

The invention relates to the technical field of intelligent control, in particular to a dust collection method, electronic equipment and a storage medium of a fume hood, wherein the fume hood is provided with a front cavity and a rear cavity which are communicated, and a filter and a pulse dust collector are arranged in the rear cavity; the method comprises the following steps: when the dust concentration is determined to exceed the set maximum concentration threshold, the fume hood is controlled to stop exhausting; controlling an inflator pump to inflate the pulse dust collector, and controlling the pulse dust collector to stop working when the inflation pressure is determined to be lower than the minimum value of the air pressure range; if the concentration difference of the dust concentration before and after the pulse dust collector works is larger than the concentration difference threshold value, determining the blowing interval of the pulse dust collector based on the interval size, the concentration difference and the inflation time length of the air pressure range, and controlling the inflator pump to jump to the step of executing the control of the pulse dust collector to work after the inflator pump is inflated in the blowing interval; according to the invention, the dust collection of the self-adaptive control fume hood is adopted, so that the convenience and efficiency of dust collection can be improved.

Description

Dust collection method for fume hood, electronic equipment and storage medium

Technical Field

The present invention relates to the field of intelligent control technology, and in particular to a dust collection method, electronic equipment and storage medium for a fume hood.

Background technique

In order to prevent laboratory workers from inhaling or swallowing toxic, pathogenic or unknown toxic chemicals and organisms, the laboratory should be well ventilated to meet the laboratory's air quality requirements.

The fume hood is an operating platform for staff and also has ventilation function. In related technologies, the dust generated by the fume hood is generally filtered and collected through a filter net. However, long-term filtering and collection operations can easily cause the mesh to become clogged, and the collection effect is poor, resulting in poor air quality in the laboratory.

In order to maintain a relatively stable air environment in the laboratory, it is necessary to improve the dust collection method of the fume hood to improve the dust removal effect and meet the air quality requirements of the laboratory.

Summary of the invention

The present invention aims to provide a dust collection method, electronic equipment and storage medium for a fume hood, which can improve the dust removal effect of the fume hood and maintain good air quality in the laboratory.

In order to achieve the above object, the present invention provides the following technical solutions:

In a first aspect, an embodiment of the present invention provides a dust collection method for a fume hood, wherein the fume hood has a front chamber and a rear chamber that are connected, the front chamber has a front opening that is open to an indoor environment; a filter is arranged inside the rear chamber, a pulse dust collector is arranged on the top of the rear chamber, and the pulse dust collector faces the filter; a dust collection cabinet and an air pump are arranged at the bottom of the fume hood, the dust collection cabinet is connected to the rear chamber, and the air pump is connected to the pulse dust collector;

The method comprises the following steps:

S100, obtaining the dust concentration below the filter, and when it is determined that the dust concentration exceeds a set maximum concentration threshold, controlling the fume hood to stop exhausting;

S200, determining an air pressure range of the air pump based on the dust concentration, controlling the air pump to inflate the pulse dust collector until the inflation pressure of the air pump reaches a maximum value of the air pressure range, and recording the inflation time of the air pump;

S300, controlling the pulse dust collector to work, recording the inflation pressure of the inflation pump at multiple times at set time intervals, and when it is determined that the inflation pressure is lower than the minimum value of the air pressure range, controlling the pulse dust collector to stop working;

S400, determine the concentration difference of dust concentration before and after the pulse dust collector is working. If it is determined that the concentration difference is greater than the concentration difference threshold, determine the blowing interval of the pulse dust collector based on the interval size of the air pressure range, the concentration difference and the inflation time, and control the inflation pump to inflate within the blowing interval, and then jump to the step of executing the control of the pulse dust collector.

Optionally, in S200, determining the air pressure range of the air pump based on the dust concentration includes:

S210, obtaining the time intervals at which the dust concentration reaches the maximum concentration threshold and a pre-established concentration-air pressure comparison table, wherein the concentration-air pressure comparison table includes multiple dust concentration intervals, each dust concentration interval having a corresponding reference air pressure range;

S220, determining a reference air pressure range corresponding to a dust concentration interval in which the dust concentration is located, and further determining a minimum value and an interval size of the reference air pressure range;

S230, determine the dust removal cycle trend value based on the most recent multiple time intervals, use the product of the dust removal cycle trend value and the interval size as the new interval size, keep the minimum value of the reference air pressure range unchanged, and use the new interval size as the air pressure range of the air pump.

Optionally, in S230, determining the dust removal cycle trend value based on the most recent multiple time intervals includes:

Get the current time interval and the two most recent time intervals, and calculate the dust removal cycle trend value based on the following formula;

;

Wherein, d0 represents the dust removal cycle trend value, t0 represents the current time interval, t1 represents the most recent time interval, and t2 represents the second most recent time interval.

Optionally, the pulse dust collector includes a plurality of air valves arranged side by side, the filter includes a plurality of filter cartridges, and the plurality of air valves are oriented toward the plurality of filter cartridges in a one-to-one correspondence; in S300, the pulse dust collector is controlled to work, and the inflation pressure of the inflation pump at a plurality of times is recorded at a set time interval, and when it is determined that the inflation pressure is lower than the minimum value of the air pressure range, the pulse dust collector is controlled to stop working, including:

S310, obtaining a reference backflush duration of the gas valve, and using the reference backflush duration as the current backflush duration;

S320, controlling the plurality of gas valves to work in turn according to the current back-blowing duration, and determining in real time whether the inflation pressure is lower than the minimum value of the gas pressure range, if so, controlling the pulse dust collector to stop working; if not, making each gas valve work in turn once as a back-blowing cycle, and executing S330;

S330, obtain the inflation pressure curve of the inflation pump in the previous backblowing cycle, determine the inflation pressure and backblowing duration of the inflation pump after the next backblowing cycle based on the inflation pressure curve, and judge whether the inflation pressure of the inflation pump after the next backblowing cycle is lower than the minimum value of the air pressure range. If so, execute S320; otherwise, set the current backblowing duration to the backblowing duration of the air valve in the next backblowing cycle, and then execute S320.

Optionally, in S330, acquiring an inflation pressure curve of the inflation pump in a previous backflush cycle, and determining a predicted inflation pressure and a predicted backflush duration of the inflation pump after a next backflush cycle ends based on the inflation pressure curve, includes:

S331, sampling the inflation pressure of the inflation pump at a set time interval in the previous backflush cycle to obtain an inflation pressure sampling sequence;

S332, fitting the inflation pressure sampling sequence using the least square method to obtain an inflation pressure curve;

S333, multiplying the current blowback time by the absolute value of the first-order derivative of the inflation pressure curve, and accumulating the current blowback time as the predicted blowback time of the air valve in the next blowback cycle;

S334: Determine the inflation pressure after the predicted backflush time based on the inflation pressure curve as the predicted inflation pressure after the next backflush cycle of the inflation pump ends.

Optionally, in S400, determining the spraying interval of the pulse dust collector based on the interval size of the air pressure range, the concentration difference and the inflation time includes:

Obtain the reference air pressure range, concentration difference threshold, concentration difference, inflation time and air pressure range of the inflation pump;

The injection interval of the pulse dust collector is calculated using the formula △T=T*△P/P0*(△C-C0)/C0; where △T represents the injection interval, △P represents the interval size of the air pump pressure range, P0 represents the interval size of the reference air pressure range, T represents the inflation time, △C represents the concentration difference, and C0 represents the concentration difference threshold.

In a second aspect, an embodiment of the present invention provides an electronic device, the electronic device comprising:

at least one processor;

at least one memory for storing at least one program;

When the at least one program is executed by the at least one processor, the at least one processor implements the dust collection method for the fume hood as described in any one of the above.

In a third aspect, an embodiment of the present invention provides a computer-readable storage medium storing a program executable by a processor, wherein the program executable by the processor is used to execute the dust collection method for a fume hood as described in any one of the above when executed by the processor.

The beneficial effects of the present invention are as follows: the present invention discloses a dust collection method, electronic device and storage medium for a fume hood. When it is determined that the dust concentration exceeds a set maximum concentration threshold, the present invention controls the fume hood to stop exhausting to avoid internal gas turbulence in the fume hood; by setting the inflation pressure as the maximum value of the air pressure range, when it is determined that the inflation pressure is lower than the minimum value of the air pressure range, the pulse dust collector is controlled to stop working, thereby ensuring the dust removal effect; the blowing interval of the pulse dust collector is determined based on the interval size of the air pressure range, the concentration difference and the inflation time, and after the inflation pump is cyclically controlled to inflate within the blowing interval, it jumps to the step of executing the control of the pulse dust collector to finally obtain a good dust removal effect; the present invention can improve the convenience and efficiency of dust collection by adopting adaptive control of the dust collection of the fume hood.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

FIG1 is a schematic flow chart of a dust collection method for a fume hood according to an embodiment of the present invention;

FIG2 is a structural diagram of a fume hood in an embodiment of the present invention;

FIG3 is a schematic diagram of the effect of exhaust from a fume hood according to an embodiment of the present invention;

FIG4 is a schematic diagram of the dust removal effect of a fume hood according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of the structure of an electronic device in an embodiment of the present invention.

Detailed ways

The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention, so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

Refer to FIG. 1 , which is a dust collection method for a fume hood provided by the present invention, wherein the fume hood has a front chamber 100 and a rear chamber 200 that are connected, and the front chamber 100 has a front opening that is open to the indoor environment; a filter 300 is arranged inside the rear chamber 200, and a pulse dust collector 400 is arranged on the top of the rear chamber 200, and the pulse dust collector 400 faces the filter 300; a dust collection cabinet 500 and an air pump 600 are arranged at the bottom of the fume hood, and the dust collection cabinet 500 is connected to the rear chamber 200, and the air pump 600 is connected to the pulse dust collector 400;

The method comprises the following steps:

S100, obtaining the dust concentration below the filter 300, and when it is determined that the dust concentration exceeds a set maximum concentration threshold, controlling the fume hood to stop exhausting;

2, 3 and 4, the arrows in the figures indicate the airflow direction. In the embodiment provided by the present invention, an exhaust port 210 is provided on the top of the rear chamber 200, and the gas inside the fume hood is extracted by a fan and then exhausted from the exhaust port 210; a dust concentration sensor 220 is provided inside the rear chamber 200, and the dust concentration sensor 220 is arranged below the filter 300 to detect the dust concentration below the filter 300; according to the requirements of the laboratory, a maximum concentration threshold is set in advance, and when it is determined that the dust concentration reaches the concentration threshold, The air pump 600 outputs compressed air to the pulse dust collector 400. The pulse dust collector 400 generates a pulse instantaneous wind pressure to remove dust by spraying compressed air to the filter 300, which lasts for about 0.5 seconds to 1 second. At this time, the airflow extends from the filter 300 to the collection box to remove the dust attached to the filter 300 and allow the dust to enter the dust collection cabinet 500. According to the Bernoulli principle, the connection between the front chamber 100 and the rear chamber 200 is negative pressure, and the wind flow direction at this point follows the airflow under the filter 300 to flow to the collection box, and will not be blown into the laboratory. Dust removal when the fume hood stops exhausting can avoid internal gas turbulence in the fume hood.

S200, determining the air pressure range of the air pump 600 based on the dust concentration, controlling the air pump 600 to inflate the pulse dust collector 400 until the inflation pressure of the air pump 600 reaches the maximum value of the air pressure range, and recording the inflation time of the air pump 600;

It should be noted that the inflation pressure determines the compressed air pressure of the pulse dust collector 400 for pulse blowing. The greater the inflation pressure, the more secondary airflow is induced, the greater the back-blowing air velocity is formed, and the better the dust removal effect is. If the inflation pressure is too high, excessive dust cleaning will occur, which will affect the purification efficiency. Too low or too high inflation pressure will affect the dust removal effect. The dust concentration in the rear chamber 200 can indirectly reflect the dust content in the filter 300. The higher the dust concentration, the more dust the filter 300 has absorbed, resulting in the remaining dust being dispersed in the rear chamber 200, and a greater inflation pressure is required for dust removal. The dust removal effect can be guaranteed by defining the air pressure range as a key indicator based on the dust concentration, and by setting the inflation pressure to the maximum value of the air pressure range.

S300, controlling the pulse dust collector 400 to work, recording the inflation pressure of the inflation pump 600 at multiple times at set time intervals, and when it is determined that the inflation pressure is lower than the minimum value of the air pressure range, controlling the pulse dust collector 400 to stop working;

Specifically, when the pulse dust collector 400 is backblown, each backblowing will reduce the inflation pressure of the air pump 600, which directly affects the interval size of the air pressure range of the pulse dust collector 400, and further affects the dust removal effect. By controlling the air pump 600 to operate within the air pressure range, the interval size of the air pressure range of the pulse dust collector 400 can be basically maintained in a stable state.

S400, determine the concentration difference of dust concentration before and after the pulse dust collector 400 works. If it is determined that the concentration difference is greater than the concentration difference threshold, determine the blowing interval of the pulse dust collector 400 based on the interval size of the air pressure range, the concentration difference and the inflation time, and control the inflation pump 600 to inflate within the blowing interval, and then jump to the step of executing the control of the pulse dust collector 400 to work.

Specifically, after the pulse dust collector 400 stops working, the current dust concentration is obtained in real time, and the difference between the current dust concentration and the dust concentration obtained when the pulse dust collector 400 starts working is calculated to obtain the concentration difference; this embodiment dynamically adjusts the blowing interval according to the interval size of the air pressure range, the concentration difference and the inflation time, and uses the blowing interval as the next inflation time of the inflation pump 600, thereby dynamically adjusting the inflation pressure of the inflation pump 600 according to the inflation time; by pre-setting the concentration difference threshold, and after each dust removal of the pulse dust collector 400, determining whether the concentration difference is greater than the concentration difference threshold, if the concentration difference is still greater than the concentration difference threshold, the inflation pressure is dynamically adjusted by real-time tracking of the dust concentration, and the step of controlling the operation of the pulse dust collector 400 is cyclically executed; if the concentration difference is reduced to the concentration difference threshold, it means that the dust concentration before and after dust removal does not change much, and the dust removal effect is basically achieved, and the dust collection work of the fume hood can be ended; finally, a good dust removal effect is obtained.

In some embodiments, in S200, determining the air pressure range of the air pump 600 based on the dust concentration includes:

S210, obtaining the time intervals at which the dust concentration reaches the maximum concentration threshold and a pre-established concentration-air pressure comparison table, wherein the concentration-air pressure comparison table includes multiple dust concentration intervals, each dust concentration interval having a corresponding reference air pressure range;

S220, determining a reference air pressure range corresponding to a dust concentration interval in which the dust concentration is located, and further determining a minimum value and an interval size of the reference air pressure range;

S230, determine the dust removal cycle trend value based on the most recent multiple time intervals, use the product of the dust removal cycle trend value and the interval size as the new interval size, keep the minimum value of the reference air pressure range unchanged, and use the new interval size as the air pressure range of the air pump 600.

It should be noted that if the time interval becomes shorter, it means that the dust concentration increases too quickly. Since the laboratory needs to maintain stable air quality, in order to avoid frequent start and stop of the pulse dust collector 400, which affects the exhaust of the fume hood and further affects the experimental operation; after obtaining the corresponding reference air pressure range through the concentration-air pressure comparison table, this embodiment also takes into account the time interval for the dust concentration to reach the maximum concentration threshold, determines the dust removal cycle trend value based on the most recent multiple time intervals, and adjusts the minimum value and interval size of the reference air pressure range; thereby adaptively adjusting the air pressure range of the air pump 600, thereby maintaining the frequent working intervals of the pulse dust collector 400 at a reasonable level, which not only ensures the stability of the laboratory's air quality, but also avoids interference with experimental operations.

In some embodiments, in S230, determining the dust removal cycle trend value based on the most recent multiple time intervals includes:

Get the current time interval and the two most recent time intervals, and calculate the dust removal cycle trend value based on the following formula;

;

Wherein, d0 represents the dust removal cycle trend value, t0 represents the current time interval, t1 represents the most recent time interval, and t2 represents the second most recent time interval.

The smaller the time interval, the faster the dust increases, and more efficient dust removal is needed. By calculating the trend value, the air pressure range of the air pump 600 can be reasonably adjusted according to the speed of dust accumulation to avoid the air quality in the laboratory from deteriorating too quickly.

In some embodiments, the pulse dust collector 400 includes a plurality of air valves 410 arranged side by side, the filter 300 includes a plurality of filter cartridges, and the plurality of air valves 410 are oriented toward the plurality of filter cartridges in a one-to-one correspondence; in S300, the pulse dust collector 400 is controlled to work, and the inflation pressure of the inflation pump 600 at a plurality of times is recorded at a set time interval, and when it is determined that the inflation pressure is lower than the minimum value of the air pressure range, the pulse dust collector 400 is controlled to stop working, including:

S310, obtaining a reference backflush duration of the gas valve 410, and using the reference backflush duration as the current backflush duration;

It should be noted that the reference backflush time of the gas valve 410 is manually set in advance according to actual conditions and experience values. In some embodiments, the reference backflush time is set to 10 seconds to 50 seconds.

S320, control the plurality of gas valves 410 to work in turn according to the current back-blowing duration, and determine in real time whether the inflation pressure is lower than the minimum value of the gas pressure range, if so, control the pulse dust collector 400 to stop working; if not, make each gas valve 410 work in turn once as a back-blowing cycle, and execute S330;

S330, obtain the inflation pressure curve of the inflation pump 600 in the previous backblowing cycle, determine the inflation pressure and backblowing duration of the inflation pump 600 after the next backblowing cycle based on the inflation pressure curve, and judge whether the inflation pressure of the inflation pump 600 after the next backblowing cycle is lower than the minimum value of the air pressure range. If so, execute S320; otherwise, set the current backblowing duration to the backblowing duration of the air valve 410 in the next backblowing cycle, and then execute S320.

It should be noted that the previous backblowing cycle is the backblowing cycle that has just ended. Adjusting the current backblowing duration of the next backblowing cycle based on the inflation pressure curve of the previous backblowing cycle can adapt to the problem of reduced blowing volume caused by the decrease in inflation pressure and maintain the dust removal effect at an effective level.

It should be noted that, due to the large size of the fume hood, it is difficult for one filter cartridge to achieve the dust collection effect. In this embodiment, multiple filter cartridges are arranged. Due to the limited air volume of the air pump 600, it is impossible to provide compressed air that meets the air pressure range to multiple filter cartridges at one time. In this embodiment, multiple air valves 410 are used to face the multiple filter cartridges in a one-to-one correspondence, and the multiple air valves 410 are switched on and off in turn by the air pump 600 to remove dust from the multiple filter cartridges in turn. Specifically, about 2 minutes after the air pump 600 starts working, the inflation pressure of the air pump 600 reaches the maximum value of the air pressure range. At this time, the first air valve 410 is controlled to start working, and the next air valve 410 is turned to start working every 30 seconds until the four air valves 410 work for a backflush cycle, and the cycle continues until the inflation pressure is lower than the minimum value of the air pressure range. This is the working process of the pulse dust collector 400 after the air pump 600 is inflated once.

In some embodiments, in S330, the step of obtaining an inflation pressure curve of the inflation pump 600 in a previous backflush cycle, and determining a predicted inflation pressure and a predicted backflush duration of the inflation pump 600 after a next backflush cycle based on the inflation pressure curve, includes:

S331, sampling the inflation pressure of the inflation pump 600 at a set time interval in the previous backflush cycle to obtain an inflation pressure sampling sequence;

S332, fitting the inflation pressure sampling sequence using the least square method to obtain an inflation pressure curve;

S333, multiplying the current blowback duration by the absolute value of the first-order derivative of the inflation pressure curve, and accumulating the current blowback duration as the predicted blowback duration of the air valve 410 in the next blowback cycle;

Specifically, the predicted blowback duration is calculated using T1=T0*(1+|f|); wherein T1 represents the predicted blowback duration, T0 represents the current blowback duration, and f represents the first-order derivative of the inflation pressure curve.

S334: Determine the inflation pressure after the predicted backflush time based on the inflation pressure curve as the predicted inflation pressure of the inflation pump 600 after the next backflush cycle ends.

It should be noted that as the inflation pressure decreases, the backwashing time of the air valve 410 in the next backwashing cycle will inevitably increase, but the specific increase has not yet been determined. In this embodiment, the sum of the current backwashing times of the multiple air valves 410 in the previous backwashing cycle is used as the predicted time. The inflation pressure of the inflation pump 600 after the next backwashing cycle can be predicted with a more conservative predicted time. If the predicted inflation pressures are all lower than the minimum value of the air pressure range, there is no need to adjust the current backwashing time. In the next backwashing cycle, the pulse dust collector 400 will naturally stop working.

In some embodiments, in S400, the determining of the spraying interval of the pulse dust collector 400 based on the interval size, concentration difference and charging time of the air pressure range includes:

Obtaining a reference air pressure range, a concentration difference threshold, a concentration difference, an inflation time, and an air pressure range of the inflation pump 600;

The injection interval of the pulse dust collector 400 is calculated using the formula △T=T*△P/P0*(△C-C0)/C0; wherein △T represents the injection interval, △P represents the interval size of the air pressure range of the air pump 600, P0 represents the interval size of the reference air pressure range, T represents the inflation time, △C represents the concentration difference, and C0 represents the concentration difference threshold.

This embodiment adjusts the inflation time according to the change in the size of the air pressure range and the change in the concentration difference, which serves as the blowing interval of the pulse dust collector 400, thereby adjusting the next inflation time of the inflation pump 600, thereby dynamically adjusting the inflation pressure of the inflation pump 600 through the inflation time, performing dynamic dust removal, and improving the dust removal effect.

In some embodiments, the fume hood further includes a pulse cleaning start-stop module connected to the pulse dust collector 400 signal. When it is determined that the dust concentration is lower than a set maximum concentration threshold, the pulse cleaning start-stop module controls the pulse dust collector 400 to stop working.

Corresponding to the method of FIG. 1 , referring to FIG. 5 , an embodiment of the present invention provides an electronic device, including:

at least one processor;

at least one memory for storing at least one program;

When the at least one program is executed by the at least one processor, the at least one processor implements the above method.

It can be seen that the contents of the above method embodiments are all applicable to the present system embodiments, the functions specifically implemented by the present system embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

In addition, an embodiment of the present invention further discloses a computer program product or a computer program, which is stored in a computer-readable storage medium. The processor of a computer device can read the computer program from the computer-readable storage medium, and the processor executes the computer program, so that the computer device executes the above method. Similarly, the contents of the above method embodiment are all applicable to the storage medium embodiment, and the functions specifically implemented by the storage medium embodiment are the same as those of the above method embodiment, and the beneficial effects achieved are also the same as those achieved by the above method embodiment.

It will be appreciated by those skilled in the art that all or some of the methods disclosed above and the system may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or transient medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present invention. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present invention.

Claims (8)

1. A dust collection method of a fume hood, characterized in that the fume hood has a front chamber and a rear chamber in communication, the front chamber having a front opening open to an indoor environment; a filter is arranged in the rear chamber, a pulse dust collector is arranged at the top of the rear chamber, and the pulse dust collector faces the filter; the bottom of the ventilation cabinet is provided with a dust collection cabinet and an inflator pump, the dust collection cabinet is communicated with the rear cavity, and the inflator pump is communicated with the pulse dust remover;

The method comprises the following steps:

S100, acquiring the dust concentration below the filter, and controlling the fume hood to stop exhausting when the dust concentration is determined to exceed a set maximum concentration threshold;

S200, determining the air pressure range of an inflator pump based on the dust concentration, controlling the inflator pump to inflate the pulse dust collector until the inflation pressure of the inflator pump reaches the maximum value of the air pressure range, and recording the inflation time of the inflator pump;

s300, controlling the pulse dust collector to work, recording the inflation pressure of an inflator pump at a plurality of moments at set time intervals, and controlling the pulse dust collector to stop working when the inflation pressure is determined to be lower than the minimum value of the air pressure range;

And S400, determining the concentration difference of dust concentration before and after the pulse dust collector works, if the concentration difference is determined to be larger than a concentration difference threshold value, determining the blowing interval of the pulse dust collector based on the interval size, the concentration difference and the inflation time length of the air pressure range, and controlling the inflator pump to perform the step of controlling the pulse dust collector to work after the inflator pump is inflated in the blowing interval.

2. The method for dust collection in a fume hood according to claim 1, wherein in S200, the determining the air pressure range of the inflator based on the dust concentration comprises:

S210, acquiring a time interval when a plurality of nearest dust concentrations reach a maximum concentration threshold value and a pre-established concentration-air pressure comparison table, wherein the concentration-air pressure comparison table comprises a plurality of dust concentration intervals, and each dust concentration interval has a corresponding reference air pressure range;

s220, determining a reference air pressure range corresponding to a dust concentration interval in which the dust concentration is located, and further determining the minimum value and the interval size of the reference air pressure range;

And S230, determining a dust removal period trend value based on a plurality of time intervals, taking the product of the dust removal period trend value and the interval size as a new interval size, keeping the minimum value of the reference air pressure range unchanged, and taking the new interval size as the air pressure range of the inflator pump.

3. A dust collection method for a fume hood according to claim 2, wherein in S230, the determining a dust removal cycle trend value based on a plurality of the time intervals comprises:

Acquiring a current time interval and a latest two time intervals, and calculating to obtain a dust removal period trend value based on the following formula;

；

wherein d0 represents a dust removal period trend value, t0 represents a current time interval, t1 represents a latest time interval, and t2 represents a second closest time interval.

4. The dust collection method of a fume hood according to claim 1, wherein the pulse dust collector comprises a plurality of air valves arranged side by side, the filter comprises a plurality of filter cartridges, and the air valves are oriented to the filter cartridges in a one-to-one correspondence; in S300, the controlling the pulse dust collector to work, recording the inflation pressure of the inflator pump at a plurality of moments at set time intervals, and when determining that the inflation pressure is lower than the minimum value of the air pressure range, controlling the pulse dust collector to stop working, including:

S310, acquiring a reference blowback time length of an air valve, and taking the reference blowback time length as a current blowback time length;

s320, controlling a plurality of air valves to work in turn according to the current back blowing time length, determining whether the inflation pressure is lower than the minimum value of the air pressure range in real time, and if yes, controlling a pulse dust collector to stop working; if not, each air valve works in turn as a back-blowing cycle, and S330 is executed;

S330, acquiring an inflation pressure curve of the inflator in the previous back-blowing cycle, determining the inflation pressure and the back-blowing duration of the inflator after the end of the next back-blowing cycle based on the inflation pressure curve, judging whether the inflation pressure of the inflator after the end of the next back-blowing cycle is lower than the minimum value of the air pressure range, and if so, executing S320; otherwise, after the current blowback time period is set as the blowback time period of the air valve in the next blowback cycle, S320 is executed.

5. The method for dust collection in a fume hood according to claim 4, wherein in S330, the obtaining an inflation pressure curve of the inflator in a previous back-blowing cycle, and determining a predicted inflation pressure and a predicted back-blowing duration of the inflator after a next back-blowing cycle based on the inflation pressure curve, includes:

S331, sampling the inflation pressure of an inflator pump according to a set time interval in the previous back blowing cycle to obtain an inflation pressure sampling sequence;

s332, fitting the inflation pressure sampling sequence by adopting a least square method to obtain an inflation pressure curve;

s333, multiplying the current blowback time length by the absolute value of the first derivative of the inflation pressure curve, and accumulating the current blowback time length to be used as the predicted blowback time length of the air valve in the next blowback cycle;

and S334, determining the inflation pressure after the predicted blowback time period based on the inflation pressure curve, and taking the inflation pressure as the predicted inflation pressure of the inflator after the end of the next blowback cycle.

6. The dust collection method of a fume hood according to claim 2, wherein in S400, the determining the blowing interval of the pulse dust collector based on the interval size, the concentration difference and the inflation time period of the air pressure range includes:

Acquiring a reference air pressure range, a concentration difference threshold value, a concentration difference, an inflation time length and an air pressure range of an inflator pump;

Calculating to obtain the blowing interval of the pulse dust collector by adopting a formula DeltaT=TDeltaP/P0 (DeltaC-C0)/C0; wherein Δt represents the blowing interval, Δp represents the section size of the inflator pressure range, P0 represents the section size of the reference pressure range, T represents the inflation time period, Δc represents the concentration difference, and C0 represents the concentration difference threshold.

7. An electronic device, the electronic device comprising:

At least one processor;

at least one memory for storing at least one program;

When the at least one program is executed by the at least one processor, the at least one processor is caused to implement the dust collection method of the fume hood of any one of claims 1 to 6.

8. A computer readable storage medium, in which a processor executable program is stored, characterized in that the processor executable program is for performing the method according to any one of claims 1 to 6 when being executed by a processor.