CN100538322C - A kind of test table for easy penetrating grain size air filter paper property - Google Patents

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

A Performance Test Bench for Air Filter Paper with the Most Penetrable Particle Size

technical field

The invention relates to the detection of air filter paper, in particular to a detection and testing platform for the detection of air filter paper.

Background technique

With the progress of science and technology, especially the progress and development of electronic technology, higher and higher requirements are put forward for the cleanliness level of the factory building. The performance of the filter material directly affects the filtering effect. At present, the domestic and international methods for calibrating the efficiency of filter media are not completely unified. In order to better integrate with international standards, it is necessary to improve technology and design a set of test benches that meet Chinese characteristics and meet international standards. There was no such test device in China before. There are related products abroad, but the foreign devices are expensive, and they are not very consistent with the filter materials produced in China.

Contents of the invention

The purpose of the present invention is to provide a performance testing platform for air filter paper with the easiest particle size to penetrate. The system is advanced and reasonable in design, realizes automatic control, convenient and fast operation, accurate and reliable test data, and has the characteristics of wide application range.

A kind of most easily penetrable particle size air filter paper performance test bench of the present invention, it comprises:

(a) a first filter for receiving air from the air pump;

(b) a second filter, the inlet of the second filter is connected to the outlet of the first filter through the first pipeline, a vacuum pump and a first regulating valve are connected in series on the first pipeline, and the vacuum pump is located 1. A second regulating valve is connected to the first pipeline between the first regulating valves through a branch pipe;

(c) a fixture, the inlet end of the fixture is connected to the second filter through the second pipeline with the first electromagnetic valve installed on it, and the other end is connected to the inlet end of the flowmeter through the third pipeline, and the flowmeter The outlet end is connected with a fourth pipeline, and a differential pressure gauge is connected in parallel on the pipeline between the inlet and outlet ends of the fixture;

(d) a dust generator, the outlet end of the dust generator is connected to the second pipeline through a fifth pipeline on which a dust generation regulator is installed;

(e) a third filter, the outlet of the third filter is connected to the fourth pipeline through the sixth pipeline, and its inlet is connected to the first solenoid valve through the seventh pipeline on which the second solenoid valve is installed. The second pipeline at the inlet end is connected;

(f) a first diluter, the inlet port of the first diluter is connected to the second pipeline located at the outlet of the first electromagnetic valve and the inlet part of the fixture through the eighth pipeline;

(g) at least one counter, the inlet port of which passes through the ninth line on which the sixth solenoid valve is installed, the tenth line on which the fifth solenoid valve is installed, and the outlet port of the first diluter and the fourth pipeline connection;

(h) the second diluter, the inlet port of the second diluter is connected with the ninth pipeline located at the inlet port of the sixth electromagnetic valve and the outlet port of the first diluter through the eleventh pipeline, and the outlet port of the second diluter is connected with the ninth pipeline installed on it through the eleventh pipeline. The twelfth pipeline of the seventh solenoid valve is connected to the ninth pipeline between the outlet port of the sixth solenoid valve and the inlet port of the counter;

(i) at least one self-cleaning device, each self-cleaning device is connected to each counter inlet by a pipeline equipped with a solenoid valve thereon;

(j) a computer, the signal input end of the computer is respectively connected with the counter, the flow meter, and the differential pressure gauge, and its signal output end is connected with all the above-mentioned solenoid valves to control the action of the solenoid valves;

(k) A temperature and humidity sensor, which tests the indoor temperature and humidity, and sends the signal to the computer.

The air filter paper performance test platform with the easiest particle size to penetrate is an advanced detection system integrating dust generation, sampling, dilution and counting. The system is advanced and reasonable in design, realizes automatic control, convenient and fast operation, accurate and reliable test data, and has the characteristics of wide application range.

Description of drawings

Fig. 1 is a kind of most easily penetrable particle diameter air filter paper performance test bench of the present invention uses a counter to carry out the layout drawing of filter paper measurement;

Fig. 2 is a layout diagram of the air filter paper performance test bench with the most penetrable particle size of the present invention using two counters to measure the filter paper.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Embodiment one:

As shown in Figure 1, the device of the present invention includes a first filter 1, which is used to receive air from the air pump; a second filter 2, whose inlet passes through the first pipeline and the second filter. The outlet of a filter 1 is connected, and a vacuum pump 3 and a first regulating valve 4 are sequentially connected in series on the first pipeline, and the first pipeline between the vacuum pump 3 and the first regulating valve 4 is connected by a branch pipe There is a second regulating valve 5; a fixture 6, the inlet end of the fixture is connected to the second filter 2 through the second pipeline on which the first electromagnetic valve 7 is installed, and the other end is connected to the flow meter 8 through the third pipeline The inlet end is connected, and the outlet end of the flow meter 8 is connected with a fourth pipeline, and a differential pressure gauge 9 is connected in parallel on the pipeline between the inlet and outlet ends of the fixture; a dust generator 10, the outlet end of the dust generator A fifth pipeline through which a dust generation regulator 11 is installed is connected to the second pipeline; a third filter 12, the outlet end of the third filter is connected to the fourth pipeline through the sixth pipeline, Its inlet end is connected with the second pipeline at the inlet end of the first electromagnetic valve 7 through the seventh pipeline on which the second solenoid valve 13 is housed; the first diluter 14, the inlet port of the first diluter is connected with the second pipeline at the first solenoid valve 7 inlet port through the eighth pipeline A solenoid valve outlet is connected to the second pipeline of the clamp inlet part; a counter 15, the inlet end of the counter is connected to the outlet end of the first diluter 14 through the ninth pipeline on which the sixth solenoid valve 16 is housed, One end of the tenth pipeline on which the fifth solenoid valve 17 is installed is connected to the ninth pipeline, and the other end is connected to the fourth pipeline; the second diluter 18, the inlet port of the second diluter 18 passes through the eleventh pipeline and is located at The inlet end of the sixth electromagnetic valve 16 is connected to the ninth pipeline at the outlet end of the first diluter 14, and its outlet end is connected to the outlet of the sixth electromagnetic valve 16 through the twelfth pipeline on which the seventh electromagnetic valve 19 is installed. end and the ninth pipeline between the inlet port of the counter; a self-cleaner 20, the self-cleaner is connected to the ninth pipeline by a pipeline on which the third electromagnetic valve 21 is housed; the device preferably includes a first Four solenoid valves 22, one end of the solenoid valve 22 is connected to the eighth pipeline, and the other end of the pipeline is connected to the tenth pipeline. A computer 23, the signal input end of the computer is connected with the counter, the flowmeter, and the differential pressure gauge respectively, and its signal output end is connected with the first to the seventh solenoid valves to control the action of the solenoid valves; a temperature and humidity sensor 24, Test the indoor temperature and humidity, and send the signal to the computer to correct the system test flow. The said dust generator is preferably a nozzle type dust generator. Said counter is preferably a laser particle counter.

Among them, the test system includes a total of 7 solenoid valves. The role of each solenoid valve is as follows:

The first solenoid valve: open the first solenoid valve, then the air mixed with aerosol enters the fixture system.

The second solenoid valve: when changing the filter paper, the fixture will open, if it is not protected, the particles in the atmospheric environment will enter the fixture along with the air flow, affecting the final test results. In order to ensure the accuracy of the test, through the computer program, the first solenoid valve is closed, and the second solenoid valve is opened to send clean air from the lower part of the fixture, so as to ensure that the fixture system is in a positive pressure state, and external particles will not enter the fixture. .

The third solenoid valve: After the counter starts to work, gas must enter the counter to ensure that the air pump of the counter will not be damaged. When a piece of filter paper is tested, the filter paper needs to be replaced. At this time, there is no need to use the counter to test the upstream and downstream of the system, so the third electromagnetic valve is opened through the program, and the fifth, sixth, and seventh electromagnetic valves are all closed. The outside air is purified by the self-purifier and enters the counter to protect the counter.

The fourth solenoid valve: 1) When the concentration of the dust-generating aerosol is very low, if it passes through the diluter again, the upstream counting concentration will be too low, which will affect the test accuracy. The sol is sent to a counter for measurement.

2) After the test bench has been used for a period of time, the system needs to calibrate the diluter in the system. At this time, the fourth solenoid valve can be opened by the computer and the sixth and seventh solenoid valves can be closed. Measure the upstream concentration of the diluter with a counter, and then open The sixth and seventh solenoid valves test the concentration downstream of the solenoid valve to obtain the dilution ratio of the diluter.

Fifth electromagnetic valve: open the fifth electromagnetic valve, close the fourth, sixth, and seventh electromagnetic valves, then the counter measures the concentration of the particle beam downstream of the fixture.

Sixth solenoid valve: open the sixth solenoid valve, close the fourth, fifth and seventh solenoid valves, then the upstream aerosol enters the counter through the first diluter.

Seventh solenoid valve: open the seventh solenoid valve, close the fourth, fifth and sixth solenoid valves, then the upstream aerosol enters the counter through the series connection of the first diluter and the second diluter.

A counter filter paper test bench test process:

(1) Turn on the air pump, the air is purified into clean air through the first filter, the first solenoid valve is opened, and the second solenoid valve is closed, the clean air interacts with the aerosol generated by the dust generator after passing through the air pump and the first filter Mixed and sent upstream of the test filter paper. The flow rate of the air can be adjusted by the regulating valve, and the flow rate of the system is measured by the flow meter.

(2) When measuring the aerosol concentration upstream of the filter paper, the first and sixth solenoid valves should be opened first (other solenoid valves are closed), and the aerosol enters the laser particle counter through the first diluter to measure the aerosol concentration. And judged by the computer, if the aerosol concentration is too high at this time, exceeding the accurate measurement range, the sixth solenoid valve will be automatically closed and the seventh solenoid valve will be opened. At this time, the aerosol passes through the series connection of the first diluter and the second diluter. The tubing enters the laser particle counter. If the measurement requirements cannot be met in this case, the system computer will automatically prompt that the dust generation amount should be adjusted manually. By manually adjusting the dust generation regulating device to ensure that the test aerosol concentration meets the measurement accuracy requirements of the counter.

(3) When testing the aerosol concentration downstream of the filter paper, the solenoid valves are automatically switched to open the first and fifth solenoid valves, and the other solenoid valves are closed. The aerosol concentration downstream of the filter paper is metered by a counter.

(4) After the test is completed, the computer system will process the automatically collected data, calculate the counting efficiency of the test filter paper, and draw the relationship curve between the aerosol particle size and the penetration rate to determine the value of the most penetrable particle size.

(5) When replacing the filter paper, the first solenoid valve is closed, while the second solenoid valve is opened, so that the air mixed with aerosol is purified into clean air through the third filter, and sent to the downstream of the filter paper to realize the reverse of the system. Blow to ensure that outside air does not enter the fixture system.

(6) During the test, the pressure difference between the upstream and downstream of the filter paper is measured by the differential pressure gauge, and the test data is sent to the computer to be displayed as one of the performance indicators of the filter paper. Measure the temperature and humidity in the environment with a thermo-hygrometer. And transmit these data to the computer to correct the flow measured by the flow meter. Since the use of the counter has certain temperature and humidity requirements, the temperature and humidity can be displayed directly from the computer to ensure the normal use of the counter.

Embodiment two:

As shown in Figure 2, the device of the present invention includes a first filter 1, which is used to receive air from the air pump; a second filter 2, whose inlet passes through the first pipeline and the second filter. The outlet of a filter 1 is connected, a vacuum pump 3 and a first regulating valve 4 are sequentially connected in series on the first pipeline, and a first pipeline between the vacuum pump 3 and the first regulating valve 4 is connected to the first pipeline. Two regulating valves 5; a fixture 6, the inlet end of the fixture is connected to the second filter 2 through the second pipeline on which the first electromagnetic valve 7 is installed, and the other end is connected to the inlet end of the flowmeter 8 through the third pipeline The outlet end of the flow meter 8 is connected with a fourth pipeline, and a differential pressure gauge 9 is connected in parallel on the pipeline between the inlet and outlet ends of the fixture; a dust generator 10, the outlet end of the dust generator passes through its A fifth pipeline with a dust generation regulator 11 installed on it is connected to the second pipeline; a third filter 12, the outlet end of the third filter is connected to the fourth pipeline through the sixth pipeline, and its inlet The end is connected with the second pipeline located at the inlet end of the first electromagnetic valve 7 through the seventh pipeline on which the second solenoid valve 13 is installed; the first diluter 14, the inlet port of the first diluter is connected with the second pipeline located at the first electromagnetic valve through the eighth pipeline. The valve outlet and the second pipeline of the clamp inlet part are connected; two counters 15, wherein the upstream inlet of the counter is connected with the outlet of the first diluter 14 through the ninth pipeline on which the sixth electromagnetic valve 16 is installed, and the downstream The inlet end of the counter is connected to one end of the tenth pipeline on which the fifth electromagnetic valve 17 is installed, and the other end of the tenth pipeline is connected to the fourth pipeline; the second diluter 18, the inlet end of the second diluter 18 passes through the eleventh pipeline It is connected with the ninth pipeline located at the inlet end of the sixth electromagnetic valve 16 and the outlet end of the first diluter 14, and its outlet end passes through the twelfth pipeline equipped with the seventh electromagnetic valve 19 and is located at the sixth electromagnetic valve 16. The outlet port of the outlet is connected with the ninth pipeline between the counter inlet; two self-cleaners 20, one self-cleaner is connected with the ninth pipeline through the pipeline on which the third solenoid valve 21 is housed, and the other self-cleaner The device 20 is connected to the tenth pipeline through the fourth solenoid valve 22; the device preferably includes an eighth solenoid valve 23, and the solenoid valve is connected to the eighth pipeline through one end of the fourteenth pipeline, and the other end is connected to the eighth pipeline through the fourteenth pipeline. Nine pipelines are connected. A computer 24, the computer signal input end is connected with the counter, flowmeter, differential pressure gauge respectively, and its signal output end is connected with the first to the eighth solenoid valve to control the action of the solenoid valve; a temperature and humidity sensor 25, Test the indoor temperature and humidity, and send the signal to the computer to correct the system test flow. The said dust generator is preferably a nozzle type dust generator. Said counter is preferably a laser particle counter.

Among them, the test system includes a total of 8 solenoid valves. The role of each solenoid valve is as follows:

The first solenoid valve: open the first solenoid valve, then the air mixed with aerosol enters the fixture system.

The second solenoid valve: when changing the filter paper, the fixture will open, if it is not protected, the particles in the atmospheric environment will enter the fixture along with the air flow, affecting the final test results. In order to ensure the accuracy of the test, through the computer program, the first solenoid valve is closed, and the second solenoid valve is opened to send clean air from the lower part of the fixture, so as to ensure that the fixture system is in a positive pressure state, and external particles will not enter the fixture. .

The third solenoid valve: After the counter starts to work, gas must enter the counter to ensure that the air pump of the counter will not be damaged. When a piece of filter paper is tested, the filter paper needs to be replaced. At this time, there is no need to use the counter to test the upstream and downstream of the system, so the third electromagnetic valve is opened through the program, and the fifth, sixth, and seventh electromagnetic valves are all closed. The outside air is purified by the self-purifier and enters the counter to protect the counter.

Fourth solenoid valve: After the counter starts to work, gas must enter the counter to ensure that the air pump of the counter will not be damaged. When a piece of filter paper is tested, the filter paper needs to be replaced. At this time, there is no need to use the counter to test the upstream and downstream of the system, and the fourth electromagnetic valve is opened through the program, and the fifth, sixth, and seventh electromagnetic valves are all closed. The outside air is purified by the self-purifier and enters the counter to protect the downstream counter.

Fifth electromagnetic valve: open the fifth electromagnetic valve, close the fourth, sixth, and seventh electromagnetic valves, then the counter measures the concentration of the particle beam downstream of the fixture.

Sixth solenoid valve: open the sixth solenoid valve, close the fourth, fifth and seventh solenoid valves, then the upstream aerosol enters the counter through the first diluter.

Seventh solenoid valve: open the seventh solenoid valve, close the fourth, fifth and sixth solenoid valves, then the upstream aerosol enters the counter through the series connection of the first diluter and the second diluter.

The eighth solenoid valve: 1) When the concentration of the dust-generating aerosol is very low, if it passes through the diluter again, the upstream counting concentration will be too low, which will affect the test accuracy. The sol is sent to a counter for measurement.

2) After the test bench has been used for a period of time, the system needs to calibrate the diluter in the system. At this time, the eighth solenoid valve can be opened by the computer and the sixth and seventh solenoid valves can be closed. Use a counter to measure the upstream concentration of the diluter, and then open The sixth and seventh solenoid valves test the concentration downstream of the solenoid valve to obtain the dilution ratio of the diluter.

The specific test process of the filter paper test bench is as follows:

(1) Turn on the air pump, the air is purified into clean air through the filter, and the flow rate of the air can be adjusted by the regulating valve, and the flow rate of the system is measured by the flow meter.

(2) Turn on the dust generating device, add aerosol to the system, mix the aerosol with clean air and send it to the upstream of the test filter paper.

(3) When measuring the aerosol concentration upstream of the filter paper, the first and sixth solenoid valves should be opened first (other solenoid valves are closed), and the aerosol enters the laser particle counter through the first diluter to measure the aerosol concentration. And judged by the computer, if the aerosol concentration is too high at this time, exceeding the accurate measurement range, the sixth solenoid valve will be automatically closed and the seventh solenoid valve will be opened. At this time, the aerosol passes through the series connection of the first diluter and the second diluter. The tubing enters the laser particle counter. If the measurement requirements cannot be met in this case, the system computer will automatically prompt that the dust generation amount should be adjusted manually. By manually adjusting the dust generation regulating device to ensure that the test aerosol concentration meets the measurement accuracy requirements of the counter.

(4) When testing the aerosol concentration downstream of the filter paper, the solenoid valves are automatically switched to open the first and fifth solenoid valves, and the other solenoid valves are closed. The aerosol concentration downstream of the filter paper is metered by a counter.

(5) After the test is completed, the computer system will process the automatically collected data, calculate the counting efficiency of the test filter paper, and draw the relationship curve between the aerosol particle size and the penetration rate to determine the value of the most penetrable particle size.

(6) When replacing the filter paper, the first solenoid valve is closed, and the second solenoid valve is opened, so that the air mixed with aerosols is purified into clean air through the third filter, and sent to the downstream of the filter paper to realize the system's reaction Blow to ensure that outside air does not enter the fixture system.

(7) During the test process, the pressure difference between the upstream and downstream of the filter paper is measured by a differential pressure gauge, and the test data is sent to the computer, which is displayed as one of the performance indicators of the filter paper. Measure the temperature and humidity in the environment with a thermo-hygrometer. And transmit these data to the computer to correct the flow measured by the flow meter. Since the use of the counter has certain temperature and humidity requirements, the temperature and humidity can be displayed directly from the computer to ensure the normal use of the counter.

In the devices of the two embodiments of the present invention, the counters are required to have high precision (the error cannot exceed 1%) and good reproducibility, and laser particle counters are preferably used. In order to prevent dust production in pipelines and solenoid valves from affecting the test aerosol concentration, dust-free pipelines and solenoid valves are selected. The flow meter, differential pressure meter, and temperature and humidity meter selected by the device are all selected according to the test requirements. The temperature and humidity of the measurement environment are measured by a temperature and humidity test instrument. Since the pressure difference between the upstream and downstream of the filter paper in the test state is a key test data, an accurate pressure difference sensor is used to measure the pressure difference between the two ends of the filter paper, and the data is directly displayed on the panel through the equipped data display device. All the above-mentioned instruments need to have high precision (the error cannot exceed 1%) and good reproducibility.

This filter paper performance test system uses the most permeable particle size efficiency to indicate the efficiency of high-efficiency filter paper. With reference to the latest EU standard: EN1822, it is possible to test the efficiency of the most penetrable particle size (MPPS) for high-efficiency and ultra-high-efficiency filter materials.

The particle size efficiency was determined by a laser particle counter using the particle counting method. This test bench can produce polydispersity test aerosol (such as DOP (dioctyl phthalate), DEHS (diethylhexyl sebacate) and other liquid particles), and can also produce PSL (polystyrene latex balls) and other solid particles. As an aerosol for filter material testing, the particle count concentration of the aerosol can be adjusted. Simultaneously sample the upstream and downstream air of the filter material, use a laser particle counter to measure the aerosol concentration in the sampled air, and determine the particle count concentration values of different particle sizes. The above measurement results are used to draw the efficiency curve of high-efficiency filter paper corresponding to different particle sizes at different filtration rates, and determine the particle size at the minimum efficiency. This particle size is referred to as the "most penetrating particle size" MPPS.

In addition, the resistance loss of the filter material at the specified high-efficiency filter rated flow rate can be determined.

Claims (4)

1. A performance test bench for air filter paper with the easiest particle size to penetrate is characterized in that it comprises: (a) a first filter for receiving air from the air pump; (b) a second filter, the inlet of the second filter is connected to the outlet of the first filter through the first pipeline, a vacuum pump and a first regulating valve are connected in series on the first pipeline, and the vacuum pump is located 1. A second regulating valve is connected to the first pipeline between the first regulating valves through a branch pipe; (c) a fixture, the inlet end of the fixture is connected to the second filter through the second pipeline with the first electromagnetic valve installed on it, and the other end is connected to the inlet end of the flowmeter through the third pipeline, and the flowmeter The outlet end is connected with a fourth pipeline, and a differential pressure gauge is connected in parallel on the pipeline between the inlet and outlet ends of the fixture; (d) a dust generator, the outlet end of the dust generator is connected to the second pipeline through a fifth pipeline on which a dust generation regulator is installed; (e) a third filter, the outlet of the third filter is connected to the fourth pipeline through the sixth pipeline, and its inlet is connected to the first solenoid valve through the seventh pipeline on which the second solenoid valve is installed. The second pipeline at the inlet end is connected; (f) a first diluter, the inlet port of the first diluter is connected to the second pipeline located at the outlet of the first electromagnetic valve and the inlet part of the fixture through the eighth pipeline; (g) at least one counter, the inlet port of which passes through the ninth line on which the sixth solenoid valve is installed, the tenth line on which the fifth solenoid valve is installed, and the outlet port of the first diluter and the fourth pipeline connection; (h) the second diluter, the inlet port of the second diluter is connected with the ninth pipeline located at the inlet port of the sixth electromagnetic valve and the outlet port of the first diluter through the eleventh pipeline, and the outlet port of the second diluter is connected with the ninth pipeline installed on it through the eleventh pipeline. The twelfth pipeline of the seventh solenoid valve is connected to the ninth pipeline between the outlet port of the sixth solenoid valve and the inlet port of the counter; (i) at least one self-cleaning device, each self-cleaning device is connected to each counter inlet by a pipeline equipped with a solenoid valve thereon; (j) a computer, the signal input end of the computer is respectively connected with the counter, the flow meter, and the differential pressure gauge, and its signal output end is connected with all the above-mentioned solenoid valves to control the action of the solenoid valves; (k) A temperature and humidity sensor, which tests the indoor temperature and humidity, and sends the signal to the computer. 2. The air filter paper performance test bench with the most penetrable particle size according to claim 1, characterized in that: it also includes an eighth solenoid valve, and the eighth solenoid valve is connected to the first solenoid valve through one end of the fourteenth pipeline. Eight pipelines are connected, and the other end is connected with the ninth pipeline. 3. The most penetrable particle size air filter paper performance test bench according to claim 1 or 2, characterized in that: said dust generator is a nozzle type dust generator. 4. The air filter paper performance test bench with the most penetrable particle size according to claim 3, characterized in that: said counter is a laser particle counter.

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