CN100538322C - A kind of test table for easy penetrating grain size air filter paper property - Google Patents
A kind of test table for easy penetrating grain size air filter paper property Download PDFInfo
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- CN100538322C CN100538322C CNB2006100133704A CN200610013370A CN100538322C CN 100538322 C CN100538322 C CN 100538322C CN B2006100133704 A CNB2006100133704 A CN B2006100133704A CN 200610013370 A CN200610013370 A CN 200610013370A CN 100538322 C CN100538322 C CN 100538322C
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Abstract
The invention discloses a kind of test table for easy penetrating grain size air filter paper property, it comprises: one first filtrator, one second filtrator, anchor clamps, a powder producer, one the 3rd filtrator, first diluter, at least one counter, second diluter, at least one self-purifier, a computing machine, a Temperature Humidity Sensor.Test board of the present invention is that to send out dirt, sampling, dilution, counting be the advanced detection system of one to collection.This system design is rationally advanced, has realized robotization control, and convenient to operation, test data has advantage of wide range of application accurately and reliably.
Description
Technical field
The present invention relates to air filter paper and detect, the invention particularly relates to the detection test board that air filter paper detects usefulness.
Background technology
Along with the progress of science and technology, the especially progress of electronics technology has proposed more and more higher requirement to the lustration class of factory building.The performance of filtering filtrate directly affects filter effect.At present domestic method with the efficient of demarcating the filtration filtrate is not in the world completely unified, and in line with international standards better, just needs the improvement technology, designs a cover and meets distinct Chinese characteristics, can satisfy the test board of international standard again.Domestic before this still do not have this type of proving installation.Have Related product abroad, but external device costs an arm and a leg, and with the filtering material of China production be not very identical.
Summary of the invention
The object of the present invention is to provide a kind of test table for easy penetrating grain size air filter paper property, this system design is rationally advanced, has realized robotization control, and convenient to operation, test data has advantage of wide range of application accurately and reliably.
A kind of test table for easy penetrating grain size air filter paper property of the present invention, it comprises:
(a) one first filtrator, this filtrator is used to receive the air that comes from air pump;
(b) one second filtrator, the import of this second filtrator links to each other with the outlet of first filtrator by first pipeline, on described first pipeline, be connected with vacuum pump, first variable valve successively, on first pipeline between vacuum pump, first variable valve, be connected with second variable valve by arm;
(c) anchor clamps, the entrance point of these anchor clamps links to each other with described second filtrator by second pipeline that is contained in first solenoid valve on it, the other end links to each other with the flowmeter entrance point by the 3rd pipeline, described flowmeter endpiece is connected with the 4th pipeline, is parallel with a differential pressure indicator on the pipeline between the import and export end of these anchor clamps;
(d) powder producer, the endpiece of this powder producer links to each other with described second pipeline by the 5th pipeline that a powder amount regulator is installed on it;
(e) one the 3rd filtrator, the endpiece of the 3rd filtrator links to each other with described the 4th pipeline by the 6th pipeline, and its entrance point links to each other with second pipeline that is positioned at the first solenoid valve entrance point by the 7th pipeline that second solenoid valve is housed on it;
(f) first diluter, this first diluter inlet end links to each other with second pipeline that is positioned at first electromagnetic valve outlet, anchor clamps inlet part by the 8th pipeline;
(g) at least one counter, this counter inlet end link to each other with the endpiece and the 4th pipeline of described first diluter by the 9th pipeline that the 6th solenoid valve is housed on it, the tenth pipeline that the 5th solenoid valve is housed on it respectively;
(h) second diluter, this second diluter inlet end by the 11 pipeline be positioned at described the 6th solenoid valve entrance point and link to each other with the 9th pipeline of the first diluter endpiece, ten two pipeline of its endpiece by the 7th solenoid valve is housed on it with link to each other with the 9th pipeline between the described counter entrance point at the endpiece of described the 6th solenoid valve;
(i) at least one self-purifier, this each self-purifier link to each other with described each counter inlet by the pipeline that solenoid valve is housed on it respectively;
(j) computing machine, this Computer signal input end links to each other with described counter, flowmeter, differential pressure indicator respectively, and its signal output part links to each other with the action of control electromagnetic valve with above-mentioned whole solenoid valves;
(k) Temperature Humidity Sensor is tested indoor temperature and humidity, and signal is passed to computing machine.
Test table for easy penetrating grain size air filter paper property of the present invention is that to send out dirt, sampling, dilution, counting be the advanced detection system of one to collection.This system design is rationally advanced, has realized robotization control, and convenient to operation, test data has advantage of wide range of application accurately and reliably.
Description of drawings
Fig. 1 is that a kind of test table for easy penetrating grain size air filter paper property of the present invention is used the arrangenent diagram that a counter carries out the filter paper measurement;
A kind of test table for easy penetrating grain size air filter paper property of Fig. 2 the present invention is used two counters and is carried out the arrangenent diagram that filter paper is measured.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done to describe in detail.
Embodiment one:
Apparatus of the present invention comprise one first filtrator 1 as shown in Figure 1, and this filtrator 1 is used to receive the air that comes from air pump; One second filtrator 2, the import of this second filtrator 2 links to each other with the outlet of first filtrator 1 by first pipeline, on described first pipeline, be connected with vacuum pump 3, first variable valve 4 successively, on described first pipeline between vacuum pump 3, first variable valve 4, be connected with second variable valve 5 by arm; Anchor clamps 6, the entrance point of these anchor clamps links to each other with described second filtrator 2 by second pipeline that is contained in first solenoid valve 7 on it, the other end links to each other with flowmeter 8 entrance points by the 3rd pipeline, described flowmeter 8 endpiece are connected with the 4th pipeline, are parallel with a differential pressure indicator 9 on the pipeline between the import and export end of these anchor clamps; A powder producer 10, the endpiece of this powder producer links to each other with described second pipeline by the 5th pipeline that a powder amount regulator 11 is installed on it; The endpiece of one the 3rd filtrator 12, the three filtrators links to each other with described the 4th pipeline by the 6th pipeline, and its entrance point links to each other with second pipeline that is positioned at first solenoid valve, 7 entrance points by the 7th pipeline that second solenoid valve 13 is housed on it; First diluter 14, this first diluter inlet end links to each other with second pipeline that is positioned at first electromagnetic valve outlet, anchor clamps inlet part by the 8th pipeline; A counter 15, nine pipeline of this counter inlet end by the 6th solenoid valve 16 is housed on it, link to each other with the endpiece of described first diluter 14, the tenth pipeline one end that the 5th solenoid valve 17 is housed on it in described the 9th pipeline link to each other, the other end links to each other with the 4th pipeline; Second diluter 18, these second diluter, 18 inlet ends by the 11 pipeline be positioned at described the 6th solenoid valve 16 entrance points and link to each other with the 9th pipeline of first diluter, 14 endpiece, ten two pipeline of its endpiece by the 7th solenoid valve 19 is housed on it with link to each other with the 9th pipeline between the described counter entrance point at the endpiece of described the 6th solenoid valve 16; A self-purifier 20, this self-purifier links to each other with described the 9th pipeline by the pipeline that the 3rd solenoid valve 21 is housed on it; This device preferably includes one the 4th solenoid valve 22, and this solenoid valve 22 links to each other with described the 8th pipeline by pipeline one end, and this pipeline other end links to each other with described the tenth pipeline.A computing machine 23, this Computer signal input end links to each other with described counter, flowmeter, differential pressure indicator respectively, and its signal output part links to each other with the action of control electromagnetic valve with first to the 7th solenoid valve; A Temperature Humidity Sensor 24 is tested indoor temperature and humidity, and signal is passed to computing machine, and the system testing flow is revised.Described powder producer is preferably the nozzle type powder producer.Described counter is preferably laser particle counter.
Wherein this test macro comprises 7 solenoid valves altogether.The effect of each solenoid valve is as follows:
First solenoid valve: open first electromagnetic valve, then be mixed with aerocolloidal air and enter chucking appliance system.
Second solenoid valve: when changing filter paper, anchor clamps can be opened, if do not protected then particle in the atmospheric environment will together enter anchor clamps with air-flow, influence last test result.For guarantee to test accurately, by computer program,, and second electromagnetic valve opened first closed electromagnetic valve, pure air is sent from the anchor clamps bottom, guarantee that like this chucking appliance system is in barotropic state, extraneous particle then can not enter anchor clamps.
The 3rd solenoid valve: after counter is started working, must have gas to enter the air pump that counter just can guarantee counter and can not damage.After a filter paper test is finished, need to change filter paper.Do not need this time applicating counter that system's upstream and downstream is tested, then the 3rd electromagnetic valve is opened by program, and the 5th, six, seven electromagnetic valve Close Alls.Enter counter after by self-purifier outside air being purified, counter is protected.
The 4th solenoid valve: 1) when sending out the aerocolloidal concentration of dirt very low the time,, then at this moment can open the 4th solenoid valve, directly gasoloid be sent into counter and measure if, influence measuring accuracy again through diluter then can cause the upstream number concentration low excessively.
2) after test board uses a period of time, system need demarcate the diluter in the system, can open the 4th solenoid valve and close the 6th, the 7th electromagnetic valve this moment by computing machine, with counter measures diluter upstream concentration, open the 6th, the 7th solenoid valve test solenoid valve downstream concentration again, thereby obtain the dilution ratio of diluter.
The 5th solenoid valve: open the 5th electromagnetic valve, close the 4th, six, seven electromagnetic valves, then counter measures anchor clamps downstream particle beams concentration.
The 6th solenoid valve: open the 6th electromagnetic valve, close fourth, fifth, seven electromagnetic valves, then upstream gas colloidal sol enters counter by first diluter.
The 7th solenoid valve: open the 7th electromagnetic valve, close fourth, fifth, six electromagnetic valves, then upstream gas colloidal sol enters counter by the series connection of first diluter, second diluter.
A counter filter paper test board test process:
(1) open air pump, air is a pure air through first filter cleaning, and first solenoid valve is opened, and second closed electromagnetic valve, and pure air mixes mutually with gasoloid that powder producer is taken place after via air pump, first filtrator, and delivers to test filter paper upstream.The flow velocity of air can be regulated by variable valve, and the flow of system is measured by flowmeter.
(2) when measuring the upstream gas collosol concentration of filter paper, should at first open first, six solenoid valves (other solenoid valve state is for closing), gasoloid enters laser particle counter by first diluter, dosing aerosols concentration.And judge by computing machine, if this moment, aerosol concentration was too high, surpass the accurate measurement scope, then close the 6th solenoid valve automatically and open the 7th solenoid valve, this moment, gasoloid entered laser particle counter by the series pipe of first diluter and second diluter.If in this case can't Testing requirement, system-computed chance prompting be automatically answered the manual adjustments powder amount.Send out the dirt regulating device by manual adjustments, to guarantee test aerosol concentration coincide counter measuring accuracy requirement.
(3) when testing the aerosol concentration in filter paper downstream, then solenoid valve automatically switches to first, five solenoid valves and opens other closed electromagnetic valves.Aerosol concentration by counter metering filter paper downstream.
(4) after test is finished, computer system can be handled the data of gathering automatically, calculate the counting efficiency of test filter paper, and draws out gasoloid particle diameter and penetrance relation curve, determines the numerical value of easy penetrating grain size.
When (5) changing filter paper, first closed electromagnetic valve then, and second solenoid valve is opened, and makes that being mixed with aerocolloidal air is pure air through the 3rd filter cleaning, and deliver to the filter paper downstream, and realize the blowback of system, guarantee that outside air does not enter chucking appliance system.
(6) in test process, measure pressure reduction by differential manometer, and test data is sent to computing machine by the filter paper upstream and downstream, show as one of performance index of filter paper.By the temperature in the Hygrothermograph measurement environment, humidity situation.And give computing machine with these data transmission, the flow of flowmeter survey is revised.Because the use of counter has certain humiture requirement, thus can intuitively show humiture from computing machine, to guarantee the normal use of counter.
Embodiment two:
Apparatus of the present invention comprise one first filtrator 1 as shown in Figure 2, and this filtrator 1 is used to receive the air that comes from air pump; One second filtrator 2, the import of this second filtrator 2 links to each other with the outlet of first filtrator 1 by first pipeline, on described first pipeline, be connected with vacuum pump 3, first variable valve 4 successively, on described first pipeline between vacuum pump 3, first variable valve 4, be connected with second variable valve 5; Anchor clamps 6, the entrance point of these anchor clamps links to each other with described second filtrator 2 by second pipeline that is contained in first solenoid valve 7 on it, the other end links to each other with flowmeter 8 entrance points by the 3rd pipeline, described flowmeter 8 endpiece are connected with the 4th pipeline, are parallel with a differential pressure indicator 9 on the pipeline between the import and export end of these anchor clamps; A powder producer 10, the endpiece of this powder producer links to each other with described second pipeline by the 5th pipeline that a powder amount regulator 11 is installed on it; The endpiece of one the 3rd filtrator 12, the three filtrators links to each other with described the 4th pipeline by the 6th pipeline, and its entrance point links to each other with second pipeline that is positioned at first solenoid valve, 7 entrance points by the 7th pipeline that second solenoid valve 13 is housed on it; First diluter 14, this first diluter inlet end links to each other with second pipeline that is positioned at first electromagnetic valve outlet, anchor clamps inlet part by the 8th pipeline; Two counters 15, this counter inlet end of its middle and upper reaches links to each other with the endpiece of described first diluter 14 by the 9th pipeline that the 6th solenoid valve 16 is housed on it, the downstream counter inlet end with its on the 5th solenoid valve 17 is housed the tenth pipeline one end link to each other, the tenth pipeline other end links to each other with described the 4th pipeline; Second diluter 18, these second diluter, 18 inlet ends by the 11 pipeline be positioned at described the 6th solenoid valve 16 entrance points and link to each other with the 9th pipeline of first diluter, 14 endpiece, ten two pipeline of its endpiece by the 7th solenoid valve 19 is housed on it with link to each other with the 9th pipeline between the described counter entrance point at the endpiece of described the 6th solenoid valve 16; 20, one self-purifiers of two self-purifiers link to each other with described the 9th pipeline by the pipeline that the 3rd solenoid valve 21 is housed on it, and another self-purifier 20 is by the 4th solenoid valve 22 and described the tenth pipeline; This device preferably includes one the 8th solenoid valve 23, and this solenoid valve links to each other with described the 8th pipeline by the 14 pipeline one end, and the other end links to each other with described the 9th pipeline.A computing machine 24, this Computer signal input end links to each other with described counter, flowmeter, differential pressure indicator respectively, and its signal output part links to each other with the action of control electromagnetic valve with first to the 8th solenoid valve; A Temperature Humidity Sensor 25 is tested indoor temperature and humidity, and signal is passed to computing machine, and the system testing flow is revised.Described powder producer is preferably the nozzle type powder producer.Described counter is preferably laser particle counter.
Wherein this test macro comprises 8 solenoid valves altogether.The effect of each solenoid valve is as follows:
First solenoid valve: open first electromagnetic valve, then be mixed with aerocolloidal air and enter chucking appliance system.
Second solenoid valve: when changing filter paper, anchor clamps can be opened, if do not protected then particle in the atmospheric environment will together enter anchor clamps with air-flow, influence last test result.For guarantee to test accurately, by computer program,, and second electromagnetic valve opened first closed electromagnetic valve, pure air is sent from the anchor clamps bottom, guarantee that like this chucking appliance system is in barotropic state, extraneous particle then can not enter anchor clamps.
The 3rd solenoid valve: after counter is started working, must have gas to enter the air pump that counter just can guarantee counter and can not damage.After a filter paper test is finished, need to change filter paper.Do not need this time applicating counter that system's upstream and downstream is tested, then the 3rd electromagnetic valve is opened by program, and the 5th, six, seven electromagnetic valve Close Alls.Enter counter after by self-purifier outside air being purified, counter is protected.
The 4th solenoid valve: after counter is started working, must have gas to enter the air pump that counter just can guarantee counter and can not damage.After a filter paper test is finished, need to change filter paper.Do not need this time applicating counter that system's upstream and downstream is tested, then the 4th electromagnetic valve is opened by program, and five, six, seven electromagnetic valve Close Alls.Enter counter after by self-purifier outside air being purified, downstream counter is protected.
The 5th solenoid valve: open the 5th electromagnetic valve, close the 4th, six, seven electromagnetic valves, then counter measures anchor clamps downstream particle beams concentration.
The 6th solenoid valve: open the 6th electromagnetic valve, close fourth, fifth, seven electromagnetic valves, then upstream gas colloidal sol enters counter by first diluter.
The 7th solenoid valve: open the 7th electromagnetic valve, close fourth, fifth, six electromagnetic valves, then upstream gas colloidal sol enters counter by the series connection of first diluter, second diluter.
The 8th solenoid valve: 1) when sending out the aerocolloidal concentration of dirt very low the time,, then at this moment can open the 8th solenoid valve, directly gasoloid be sent into counter and measure if, influence measuring accuracy again through diluter then can cause the upstream number concentration low excessively.
2) after test board uses a period of time, system need demarcate the diluter in the system, can open the 8th solenoid valve and close the 6th, the 7th electromagnetic valve this moment by computing machine, with counter measures diluter upstream concentration, open the 6th, the 7th solenoid valve test solenoid valve downstream concentration again, thereby obtain the dilution ratio of diluter.
The concrete test process of filter paper test board is as follows:
(1) open air pump, air is a pure air through filter cleaning, and the flow velocity of air can regulate by variable valve, and the flow of system is measured by flowmeter.
(2) open and send out a dirt device, add gasoloid in system, gasoloid is tested the filter paper upstream with sending into after pure air mixes.
(3) when measuring the upstream gas collosol concentration of filter paper, should at first open first, six solenoid valves (other solenoid valve state is for closing), gasoloid enters laser particle counter by first diluter, dosing aerosols concentration.And judge by computing machine, if this moment, aerosol concentration was too high, surpass the accurate measurement scope, then close the 6th solenoid valve automatically and open the 7th solenoid valve, this moment, gasoloid entered laser particle counter by the series pipe of first diluter and second diluter.If in this case can't Testing requirement, system-computed chance prompting be automatically answered the manual adjustments powder amount.Send out the dirt regulating device by manual adjustments, to guarantee test aerosol concentration coincide counter measuring accuracy requirement.
(4) when testing the aerosol concentration in filter paper downstream, then solenoid valve automatically switches to first, five solenoid valves and opens other closed electromagnetic valves.Aerosol concentration by counter metering filter paper downstream.
(5) after test is finished, computer system can be handled the data of gathering automatically, calculate the counting efficiency of test filter paper, and draws out gasoloid particle diameter and penetrance relation curve, determines the numerical value of easy penetrating grain size.
When (6) changing filter paper, first closed electromagnetic valve then, and second solenoid valve is opened, and makes that being mixed with aerocolloidal air is pure air through the 3rd filter cleaning, and deliver to the filter paper downstream, and realize the blowback of system, guarantee that outside air does not enter chucking appliance system.
(7) in test process, measure the pressure reduction of filter paper upstream and downstream by differential manometer, and test data is sent to computing machine, show as one of performance index of filter paper.By the temperature in the Hygrothermograph measurement environment, humidity situation.And give computing machine with these data transmission, the flow of flowmeter survey is revised.Because the use of counter has certain humiture requirement, thus can intuitively show humiture from computing machine, to guarantee the normal use of counter.
Require the precision height (error can not surpass 1%) of counter in two kinds of embodiment devices of the present invention, repdocutbility is good, preferably adopts laser particle counter.In order to prevent to produce dirt in pipeline and the solenoid valve, and the test aerosol concentration is exerted an influence, do not produce dirt pipeline and solenoid valve so select for use.The flowmeter that device is selected for use, differential pressure indicator, Hygrothermograph are all selected according to test request.The humiture of measurement environment is measured by the humiture test instrumentation.Because the pressure reduction of the filter paper upstream and downstream under test mode is a test critical data, so adopt accurate differential pressure pickup to measure the pressure reduction at filter paper two ends, directly data presentation is come out on panel by the data presentation instrument that is equipped with.Above-mentioned various instrument all needs precision height (error can not surpass 1%), and repdocutbility is good.
This filter paper Performance Detection pilot system is with the easiest efficient that indicates efficient filter paper through particle diameter efficient.With reference to nearest European Union standard: EN1822, can carry out the detection of easy penetrating grain size (MPPS) efficient to efficient and ultra high efficiency filtrate.
Particle diameter efficient adopts the grain count method to determine by laser particle counter.The test gasoloid (for example DOP (dioctyl phthalate), DEHS liquid particles such as (diethylhexyl sebacates)) of polydispersity can take place in this experiment table, and PSL solia particles such as (polystyrene latex balls) also can take place.Gasoloid is used in test as filtrate, and aerocolloidal grain count concentration can be regulated.In filtrate upstream and downstream air, sample simultaneously, use laser particle counter to measure aerosol concentration in the sampled air, determine the particle counting concentration numerical value of different-grain diameter.Above-mentioned measurement result is used for drawing the efficiency curve of high efficiency filter paper corresponding different-grain diameter under different filtering velocitys, and the grain size of decision during minimum efficiency.This particle diameter is called as " easy penetrating grain size " MPPS.
In addition, can be determined at the drag losses of specifying the filtrate under the high efficiency particulate air filter rated flow.
Claims (4)
1. test table for easy penetrating grain size air filter paper property is characterized in that it comprises:
(a) one first filtrator, this filtrator is used to receive the air that comes from air pump;
(b) one second filtrator, the import of this second filtrator links to each other with the outlet of first filtrator by first pipeline, on described first pipeline, be connected with vacuum pump, first variable valve successively, on first pipeline between vacuum pump, first variable valve, be connected with second variable valve by arm;
(c) anchor clamps, the entrance point of these anchor clamps links to each other with described second filtrator by second pipeline that is contained in first solenoid valve on it, the other end links to each other with the flowmeter entrance point by the 3rd pipeline, described flowmeter endpiece is connected with the 4th pipeline, is parallel with a differential pressure indicator on the pipeline between the import and export end of these anchor clamps;
(d) powder producer, the endpiece of this powder producer links to each other with described second pipeline by the 5th pipeline that a powder amount regulator is installed on it;
(e) one the 3rd filtrator, the endpiece of the 3rd filtrator links to each other with described the 4th pipeline by the 6th pipeline, and its entrance point links to each other with second pipeline that is positioned at the first solenoid valve entrance point by the 7th pipeline that second solenoid valve is housed on it;
(f) first diluter, this first diluter inlet end links to each other with second pipeline that is positioned at first electromagnetic valve outlet, anchor clamps inlet part by the 8th pipeline;
(g) at least one counter, this counter inlet end link to each other with the endpiece and the 4th pipeline of described first diluter by the 9th pipeline that the 6th solenoid valve is housed on it, the tenth pipeline that the 5th solenoid valve is housed on it respectively;
(h) second diluter, this second diluter inlet end by the 11 pipeline be positioned at described the 6th solenoid valve entrance point and link to each other with the 9th pipeline of the first diluter endpiece, ten two pipeline of its endpiece by the 7th solenoid valve is housed on it with link to each other with the 9th pipeline between the described counter entrance point at the endpiece of described the 6th solenoid valve;
(i) at least one self-purifier, this each self-purifier link to each other with described each counter inlet by the pipeline that solenoid valve is housed on it respectively;
(j) computing machine, this Computer signal input end links to each other with described counter, flowmeter, differential pressure indicator respectively, and its signal output part links to each other with the action of control electromagnetic valve with above-mentioned whole solenoid valves;
(k) Temperature Humidity Sensor is tested indoor temperature and humidity, and signal is passed to computing machine.
2. test table for easy penetrating grain size air filter paper property according to claim 1, it is characterized in that: it also comprises one the 8th solenoid valve, the 8th solenoid valve links to each other with described the 8th pipeline by the 14 pipeline one end, and the other end links to each other with described the 9th pipeline.
3. test table for easy penetrating grain size air filter paper property according to claim 1 and 2 is characterized in that: described powder producer is the nozzle type powder producer.
4. test table for easy penetrating grain size air filter paper property according to claim 3 is characterized in that: described counter is a laser particle counter.
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| CNB2006100133704A CN100538322C (en) | 2006-03-24 | 2006-03-24 | A kind of test table for easy penetrating grain size air filter paper property |
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| CNB2006100133704A CN100538322C (en) | 2006-03-24 | 2006-03-24 | A kind of test table for easy penetrating grain size air filter paper property |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101701897B (en) * | 2009-10-22 | 2012-05-09 | 清华大学 | System and method for detecting filter material counting efficiency based on monodispersed aerosol |
| CN101995372B (en) * | 2010-10-19 | 2012-07-18 | 北京市劳动保护科学研究所 | Air filtering material tester |
| CN103499512B (en) * | 2013-09-23 | 2015-06-03 | 同济大学 | Air-pressure-adjustable performance testing device for air filtering material and application thereof |
| CN110180267A (en) * | 2019-06-17 | 2019-08-30 | 北京大学 | A kind of Automatic change film apparatus and method of gas particles object filter membrane |
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2006
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Non-Patent Citations (4)
| Title |
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| 最易穿透粒径在高效超高效过滤器测试中的应用. 李永祥等.洁净与空调技术，第2002年第4期. 2002 |
| 最易穿透粒径在高效超高效过滤器测试中的应用. 李永祥等.洁净与空调技术，第2002年第4期. 2002 * |
| 高效空气滤纸过滤性能测试方法的研究. 李永祥.中国优秀博硕士学位论文全文数据库(硕士) 工程科技II辑，第2004年第4期. 2004 |
| 高效空气滤纸过滤性能测试方法的研究. 李永祥.中国优秀博硕士学位论文全文数据库(硕士) 工程科技II辑，第2004年第4期. 2004 * |
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