CN214408583U - Ventilation is with air cleaner microbiological filtration performance evaluation laboratory bench - Google Patents

Ventilation is with air cleaner microbiological filtration performance evaluation laboratory bench Download PDF

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CN214408583U
CN214408583U CN202022930051.8U CN202022930051U CN214408583U CN 214408583 U CN214408583 U CN 214408583U CN 202022930051 U CN202022930051 U CN 202022930051U CN 214408583 U CN214408583 U CN 214408583U
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filter
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disinfection
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成泽林
李艳菊
王宇
吴东云
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Tianjin Chengjian University
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Abstract

The utility model discloses an air cleaner microbiological filtration performance evaluation laboratory bench for ventilation. The utility model comprises an air volume control system, a microorganism aerosol generating system, a microorganism sampling system, an environmental parameter measuring system, a disinfection and sterilization system and a data recording and collecting system; the fan is positioned at the forefront of the whole experiment table, and the microbial aerosol generating system consists of a generator, a host and a tripod; the environment parameter measuring system comprises a pressure transmitter, a temperature and humidity transmitter and an anemometer, and the disinfection and sterilization system consists of a disinfector and a bypass disinfection pipeline; the data recording and collecting system is composed of a computer. The utility model discloses can test and experimental study performance such as air cleaner's resistance, microbial filtration efficiency, dust holding capacity.

Description

Ventilation is with air cleaner microbiological filtration performance evaluation laboratory bench
Technical Field
The utility model belongs to the technical field of air cleaner performance test, especially, relate to an air cleaner microbiological filtration performance evaluation laboratory bench for ventilation.
Background
Microorganisms are a great threat to human health. The microbial aerosol has wide sources and various types and consists of different microorganisms. The contaminants in the microbial aerosol consist primarily of active particles and inactive biological contaminants. One of the major transmission routes for atypical pneumonia is through droplet transmission. The microorganisms such as virus and bacteria in the atmosphere can easily enter the human body through the respiratory tract, and the human health is seriously threatened. The most widely used today is still the removal of microbial aerosols by air filtration techniques. The microbial aerosol is removed from the air by the trapping effect of the filter on the particulate matter. At present, many studies on the filtration of microorganisms focus on the detection device of the microbial filtration material, and the testing of the filtration performance of microorganisms is not complete. And the aerosol particles intercepted by the filter still have activity, microorganisms can not only generate irritant gas, but also can be resuspended in the air along with the air flow when the pressure at the two ends of the filter is changed or the filter needs to be repaired when a fault is met.
This patent proposes to add microorganism sampling circulation system in the air cleaner microorganism testboard low reaches sampling section for general ventilation, guarantees the detection precision of low reaches microorganism sampling among the different filter performance tests. And a disinfection system is added behind the tail end high-efficiency filter, so that the residual microbial aerosol in the air duct after the test is finished can not pollute the laboratory environment, and the requirement of the air filter on the microbial filtration performance test is met.
SUMMERY OF THE UTILITY MODEL
In order to evaluate all for ventilation air cleaner's microbial filtration performance (resistance, efficiency, dust holding capacity), study the performance parameter of filter, according to the standard that the filter performance that is relevant at home and abroad detected, the utility model relates to a build perfect air cleaner microbial filtration and detect experimental apparatus.
The utility model aims at having built the microbial filtration detection experiment platform of filter according to relevant standard to introduce the principle that should examine test table, introduced to each component, including air control system, microorganism aerosol generating system, microorganism sampling system, environmental parameter measurement system, disinfection and isolation system and data record collection system etc..
The utility model discloses a solve the technical scheme that its technical problem adopted and be:
a microbiological filtering performance evaluation experiment table of an air filter for ventilation comprises an air volume control system, a microbiological aerosol generation system, a microbiological sampling system, an environmental parameter measuring system, a disinfection and sterilization system and a data recording and collecting system; the air quantity control system consists of a fan, a fan box and a nozzle box; the microbial aerosol generating system consists of a microbial aerosol generator, a host and a tripod, wherein the microbial aerosol generator consists of an atomizing chamber containing liquid, a spray nozzle and a spray cap; the microorganism sampling system comprises an upstream sampling pipe, a downstream sampling pipe, an upstream sampling static pressure ring, a downstream sampling static pressure ring and an Anderson sampler; the environment parameter measuring system comprises a pressure transmitter, a temperature and humidity transmitter and an anemometer, wherein the pressure transmitter is arranged below the downstream sampling section box body, and the temperature and humidity transmitter is arranged on the nozzle box body; the temperature and humidity transmitter takes a temperature and humidity integrated probe as a temperature measuring element; the anemometer is arranged on the ventilation pipeline and the air outlet to detect the wind speed; the disinfection and sterilization system consists of a disinfection instrument and a bypass disinfection pipeline; the data recording and collecting system is composed of a computer;
a fan is placed in the fan box 1, an air outlet of the fan is connected with the nozzle box 2 through an air duct, the microbial aerosol generator 3 is arranged outside the box body of the dust generation section 4, and atomized microbial aerosol is generated into the box body of the dust generation section 4 through a connecting pipe; the upper end of a spray nozzle of the microbial aerosol generator is provided with a spray hole, the speed of airflow is increased, the liquid is sprayed by the sprayed airflow to form microbial aerosol which is emitted outwards from a bent pipe at the upper part, the top of a nozzle box is connected with an air inlet of an air pipe 19 provided with a valve 20, and an air outlet of the air pipe 19 is connected with a downstream sampling section 8; the right side of the nozzle box is sequentially provided with a dust generation section 4, an upstream mixing section 5, an upstream sampling section 6, a filter to be tested 7, a downstream sampling section 8, a tail end section 9 and a high-efficiency filter 10, a temperature and humidity sensor 11 is installed on a box body of the nozzle box, an upstream sampling pipe 12 is arranged in the upstream sampling section 6, a downstream sampling pipe 15 is arranged in the downstream sampling section 8, a front static pressure ring 13 and a rear static pressure ring are installed in front of and behind the filter to be tested 7, a pressure transmitter 14 is arranged in the filter to be tested 7, the front static pressure ring 13 and the rear static pressure ring are respectively connected with the pressure transmitter 14, the pressure transmitter 14 transmits the measured resistance and pressure to a computer through electric signals, the upstream sampling pipe 12 is connected with a front Andson sampler, the downstream sampling pipe 15 is connected with a rear Andson sampler 18, and each Andson sampler comprises a timer 16, a flow meter 17 and an impactor 18; the two ends of the bypass disinfection pipeline 21 provided with the disinfector 22 are respectively connected with the fan box and the high-efficiency filter; the environment parameter measuring system comprises a pressure transmitter, a temperature and humidity transmitter and an anemometer; the temperature and humidity transmitter takes a temperature and humidity integrated probe as a temperature measuring element, collects temperature and humidity signals, converts the temperature and humidity signals into current signals or voltage signals which are in linear relation with the temperature and humidity after being processed by circuits such as voltage stabilizing filtering, operational amplification, nonlinear correction, V/I conversion, constant current and reverse protection and the like, and outputs the current signals or voltage signals; the anemometer is an instrument for detecting the wind speeds of a ventilation pipeline and an air outlet, the multipurpose connector in the middle of the probe rod can be bent by 180 degrees, the probe is provided with a protective sleeve, the sensor is prevented from being damaged, the length of the probe is 300mm, and the anemometer is also suitable for large-diameter pipelines.
The utility model discloses can test and experimental study performance such as air cleaner's resistance, efficiency, dust holding capacity. The utility model discloses perfect air cleaner microbiological filtration detection experiment device is built according to the standard design that the filter performance that is relevant at home and abroad detected, and the device can test and experimental research to performance such as air cleaner's resistance, efficiency, dust holding capacity.
Air purification equipment detects mainly to divide into KCL polydisperse solid state aerosol generator, polydisperse liquid aerosol generator and standard artificial dust generator according to the difference of each country's standard with particle pollutant generating equipment, particulate matter generating device design basis standard, take place the particulate matter type and take place the particulate matter, the utility model discloses a chooseing for use is microorganism aerosol generator.
The utility model discloses a resistance test is carried out to control amount of wind or frequency, and we carry out the resistance test through the control amount of wind in the experiment, and the combination is spouted to corresponding mouth in the scope of the amount of wind, avoids the influence of error, generally can not select 50mm combination and 80 110 150 a 2mm combination.
According to the test for the air volume uniformity of the air duct in EN 779: the wind speed uniformity in the test air channel is determined by measuring the wind speed of 9 points at the position, close to the tested filter, of the upstream end of the tested filter, the measurement error can be accepted within +/-10%, the test is respectively carried out under the wind speeds of 1500, 2500, 3400 and 4500, only the wind speed of a fan is ensured during the test, other external disturbance cannot exist, and the relatively stable state is kept. The sampling time of each measurement is not less than 30 seconds. Each point is tested for 5 times, the average value is obtained, and the average value and the standard deviation are respectively calculated according to the measured values of the 9 points.
Drawings
FIG. 1 is a schematic structural view of the test bed of the present invention;
fig. 2 is a flow chart of the system test of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1, a fan is placed in a fan box 1, an air outlet of the fan is connected with a nozzle box 2 through an air duct, a microbial aerosol generator 3 is arranged outside a box body of a dust generation section 4, and atomized microbial aerosol is sent into the box body of the dust generation section 4 through a connecting pipe; the upper end of a spray nozzle of the microbial aerosol generator is provided with a spray hole, the speed of airflow is increased, and the liquid is sprayed by the sprayed airflow to form microbial aerosol which is emitted outwards from the bent pipe at the upper part; the top of the nozzle box is connected with an air inlet of an air pipe 19 provided with a valve 20, and an air outlet of the air pipe 19 is connected with the downstream sampling section 8; the right side of the nozzle box is sequentially provided with a dust generation section 4, an upstream mixing section 5, an upstream sampling section 6, a filter to be tested 7, a downstream sampling section 8, a tail end section 9 and a high-efficiency filter 10, a temperature and humidity sensor 11 is mounted on a box body of the nozzle box, an upstream sampling pipe 12 is arranged in the upstream sampling section 6, a downstream sampling pipe 15 is arranged in the downstream sampling section 8, a front static pressure ring 13 and a rear static pressure ring are mounted in front of and behind the tested filter 7, a pressure transmitter 14 is placed in the filter to be tested 7, the front static pressure ring 13 and the rear static pressure ring are respectively connected with the pressure transmitter 14, the upstream sampling pipe 12 is connected with a front Anderson sampler, the downstream sampling pipe 15 is connected with a rear Anderson sampler 18, and each Anderson sampler comprises a timer 16, a flowmeter 17 and an impactor 18; the two ends of the bypass disinfection pipeline 21 provided with the disinfection instrument 22 are respectively connected with the fan box and the high-efficiency filter.
As shown in fig. 2, the method for testing the microbiological filtration performance evaluation bench using the air filter for ventilation comprises the following specific testing steps:
(1) a fan in the fan box 1 sucks indoor air into the air channel;
(2) the microbial aerosol generated by the microbial aerosol generator 3 is blown into the front and the back of the tested filter 7 along with the air volume through the access pipe;
(3) collecting upstream and downstream microorganisms through an Anderson sampler connected with an upstream sampling pipe 12 and a downstream sampling pipe 15, recording the number of viable bacteria colonies after culture, and calculating the microbial aerosol filtration efficiency of the filter;
(4) two static pressure rings are arranged in front of and behind the tested filter 7, and the static pressure rings are connected with a pressure transmitter 14, so that the filter resistance under the condition of no ventilation can be obtained;
(5) in the process of generating the microbial aerosol, opening a valve 20 of the microbial circulating air pipe 19, and continuously treating the microbial aerosol which is not treated at the downstream;
(6) after the microbial filtration performance test is finished, the bypass disinfection system 21 needs to be started to prevent the microbial aerosol from leaking into the ambient air;
(7) the microorganism aerosol generator 3 is replaced by a load dust generator A2Dust, the quality of the filter when the filter is cleaned and the quality after dust generation are tested, and the difference is the dust holding capacity.
The Anderson sampler connected with the upstream sampling pipe 12 and the downstream sampling pipe 15 is used for collecting upstream and downstream microorganisms, viable bacteria colony number is recorded after culture, and the microbial aerosol filtration efficiency of the filter is calculated.
The filtration efficiency was calculated as follows:
Figure BDA0002826609790000051
for the accuracy of guaranteeing the experimental data, the utility model discloses a be that two anderson sample samplers sample in the low reaches simultaneously, obtain the fungus colony number of living in low reaches respectively.
Two static pressure rings 13 are arranged in front of and behind the tested filter 7, the static pressure rings 13 are connected with a pressure transmitter 14, and the pressure transmitter 14 transmits the measured resistance and pressure to a computer through electric signals and displays the resistance and pressure at the computer end. The pressure transmitter 14 in the experiment is arranged on a bracket, is connected with two static pressure rings 13 in front of and behind the tested filter 7 and is used for testing the pressure difference and the resistance in front of and behind the filter, the pressure transmitter of Rossimont is used, the model is 3051, and the resistance of the filter under the condition of no ventilation can be obtained.
The experimental device and the generation system are constructed and the performance is researched:
the simulation generation of the active spray aerosol generated by the exhalation of a human body is the basic guarantee of the project experiment research. Because the organism has activity, the death is reduced to the maximum extent while the generation efficiency is ensured in the generation process, and therefore, a test bed with an air volume control system, a microorganism aerosol generation system, a microorganism sampling system, an environmental parameter measuring system, a disinfection and sterilization system and a data recording and collecting system is built. Wherein, the microorganism aerosol generating system consists of a generator, a host and a tripod. The generator consists of an atomizing chamber containing liquid, a spray nozzle and a spray cap; the microorganism sampling system comprises an Anderson sampler (capable of realizing multi-level particle size sampling), simulates the anatomical structure and the aerodynamic characteristics of the respiratory tract of a human body, respectively collects microorganism particles suspended in the air on the surface of a sampling medium according to the size grade by adopting the conventional impact principle, and then cultures and carries out further microorganism analysis to obtain the number of the microorganism particles in the air and the characteristics of the size distribution of the microorganism particles in the air; the existing formaldehyde generator is improved, the automatic control of the starting, generating and neutralizing time of the bypass disinfection system can be realized, and 100% sterilization of residual microorganisms after experiments is guaranteed.
The utility model discloses experiment test system constitutes and characteristic:
(1) the fan box: the air quantity required by the detection of a prototype is provided and consists of an inlet coarse filter, a centrifugal fan and a fan box, wherein the fan box is processed and manufactured by adopting a polyurethane plate, and the fan box is ensured to be sealed and airtight.
(2) An air treatment section: purifying, adjusting temperature and humidifying the inlet air to ensure that the cleanliness, temperature and relative humidity of the system air meet the standard requirements; the air inlet air treatment section is provided with equipment such as a high-efficiency filter.
(3) A pollutant generating device: the microorganism filtration efficiency test is to use the prepared original bacterial liquid, and the dust holding test is to use standard artificial dust.
(4) The measurement system comprises: the device comprises an upstream sampling pipe, a downstream sampling pipe, an upstream sampling static pressure ring, a downstream sampling static pressure ring, a switching sampling device and various measuring devices, and can realize the measurement of performance parameters such as efficiency and resistance.
(5) A nozzle box: the air quantity required by the detection platform can be adjusted and measured by combining a plurality of nozzles, and the nozzle box is made of 304 stainless steel with the thickness of 3 mm.
(6) An air duct system: a sample is provided with a test carrier, and the uniformity of the detected wind speed and the uniformity of the aerosol concentration distribution are ensured; the air duct system is made of 304 stainless steel with the thickness of 2.5 mm; the air duct system support is made of aluminum profiles.
(7) Switch board and operation panel: the frequency converter (an element in the control cabinet) and the CPU module are respectively connected with the digital output module, the analog input module, the Ethernet module and the touch screen, so that the automatic monitoring and control of each parameter in the test process can be realized.

Claims (5)

1. A microbiological filtering performance evaluation experiment table of an air filter for ventilation is characterized by comprising an air volume control system, a microbiological aerosol generation system, a microbiological sampling system, an environmental parameter measuring system, a disinfection and sterilization system and a data recording and collecting system; the air quantity control system consists of a fan, a fan box and a nozzle box; the microbial aerosol generating system consists of a microbial aerosol generator, a host and a tripod, wherein the microbial aerosol generator consists of an atomizing chamber containing liquid, a spray nozzle and a spray cap; the microorganism sampling system comprises an upstream sampling pipe, a downstream sampling pipe, an upstream sampling static pressure ring, a downstream sampling static pressure ring and an Anderson sampler; the environment parameter measuring system comprises a pressure transmitter, a temperature and humidity transmitter and an anemometer, wherein the pressure transmitter is arranged below the downstream sampling section box body, and the temperature and humidity transmitter is arranged on the nozzle box body; the temperature and humidity transmitter takes a temperature and humidity integrated probe as a temperature measuring element; the anemometer is arranged on the ventilation pipeline and the air outlet to detect the wind speed; the disinfection and sterilization system consists of a disinfection instrument and a bypass disinfection pipeline; the data recording and collecting system is composed of a computer;
a fan is arranged in the fan box, an air outlet of the fan is connected with the nozzle box through a ventilating pipeline, the microbial aerosol generator is arranged outside the box body of the dust generation section, and atomized microbial aerosol is sent into the box body of the dust generation section through a connecting pipe; the top of the nozzle box is connected with an air inlet of an air pipe provided with a valve, and an air outlet of the air pipe is connected with a downstream sampling section; the right side of the nozzle box is sequentially provided with a dust generation section, an upstream mixing section, an upstream sampling section, a filter to be tested, a downstream sampling section, a tail end section and a high-efficiency filter, a temperature and humidity sensor is mounted on a box body of the nozzle box, an upstream sampling pipe is arranged in the upstream sampling section, a downstream sampling pipe is arranged in the downstream sampling section, a front static pressure ring and a rear static pressure ring are mounted in front of and behind the filter to be tested, a pressure transmitter is placed in the filter to be tested, the front static pressure ring and the rear static pressure ring are respectively connected with the pressure transmitter, the pressure transmitter transmits measured resistance and pressure to a computer through electric signals, the upstream sampling pipe is connected with a front Anderson sampler, the downstream sampling pipe is connected with a rear Anderson sampler, and each Anderson sampler comprises a timer, a flow meter and an impactor; the two ends of the disinfection instrument bypass disinfection pipeline are respectively connected with the fan box and the high-efficiency filter.
2. The experimental bench for evaluating the microbiological filtration performance of an air filter for ventilation according to claim 1, wherein the spray nozzle of the microbial aerosol generator is provided with spray holes at its upper end.
3. The experimental bench for evaluating the microbiological filtering performance of an air filter for ventilation according to claim 1, wherein the nozzle box is formed by combining a plurality of nozzles, and the nozzle box is machined from 304 stainless steel with a thickness of 3 mm.
4. The experimental bench for evaluating the microbiological filtering performance of the air filter for ventilation according to claim 1, wherein the middle part of the probe rod of the anemometer is bent by 180 degrees by a connector, and the probe of the anemometer is provided with a protective sleeve.
5. The microbiological filtering performance evaluation test bed of the air filter for ventilation according to the claim 1, characterized in that the ventilation duct is made of 304 stainless steel with the thickness of 2.5mm, and the fixing bracket of the air duct is made of aluminum section bar.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114377183A (en) * 2021-12-26 2022-04-22 盐城聚德机械零部件有限公司 Sterilization filtering method of air filter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114377183A (en) * 2021-12-26 2022-04-22 盐城聚德机械零部件有限公司 Sterilization filtering method of air filter

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