CN114226276B - Method for screening clean air quantity testing standard prototype of particulate matters of air purifier - Google Patents
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- 238000012360 testing method Methods 0.000 title claims abstract description 74
- 238000012216 screening Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004140 cleaning Methods 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 21
- 238000001914 filtration Methods 0.000 claims description 13
- 238000011161 development Methods 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 7
- 239000013618 particulate matter Substances 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 4
- 238000012795 verification Methods 0.000 abstract description 10
- 238000004887 air purification Methods 0.000 abstract description 2
- 230000005477 standard model Effects 0.000 abstract description 2
- 238000011156 evaluation Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 5
- 238000000746 purification Methods 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 4
- 238000013097 stability assessment Methods 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000011077 uniformity evaluation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000000692 Student's t-test Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000000556 factor analysis Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000007659 motor function Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000012353 t test Methods 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
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Abstract
The invention provides a method for screening a standard model machine for testing the clean air quantity of particulate matters of an air purifier, which relates to the technical field of air purification and comprises the following steps: filter screen screening, prototype body screening and air purifier complete machine screening. The filter element and the sample machine body are screened, and then the matched whole machine is screened, so that finally, a capacity verification sample with higher stability and uniformity can be screened under the condition of less sample size.
Description
Technical Field
The invention relates to the technical field of air purification, in particular to a method for screening a standard model machine for testing the clean air quantity of particulate matters of an air purifier.
Background
An air purifier is an electric appliance used in household or other similar environments and has certain removing capability on one or more pollutants such as particulate matters, gaseous pollutants, microorganisms and the like in the air. Before the air purifier flows into the market, the clean air amount of the air purifier needs to be tested, but the data measured by different detection mechanisms often have differences, so that a test standard prototype needs to be screened in the test process, each detection mechanism tests the standard prototype, and whether the test data of each detection mechanism has consistency is judged quickly by carrying out comparison analysis on the test data of each detection mechanism.
Disclosure of Invention
The invention aims to provide a method for screening a standard sample machine for testing the clean air quantity of particulate matters of an air purifier.
The invention achieves the aim through the following technical scheme: a method of screening a standard prototype for testing the amount of particulate matter and air in an air purifier, the air purifier comprising a prototype body and a filter screen, the method comprising the steps of:
s1: screening the filter screen according to the wind resistance and the single filtering efficiency of the filter screen;
s2: randomly extracting one filter screen from the filter screen screened in the step S1, respectively assembling the filter screen with each sample machine body to form a complete machine, and screening the sample machine bodies according to the air quantity and the power test result of the complete machine;
s3: randomly pairing the filter screen screened in the step S1 and the filter screen screened in the step S2 with the sample machine body to form a plurality of complete machines, carrying out a particle cleaning test on the complete machines, and screening the standard sample machine according to the uniformity and the stability of the particle cleaning air quantity test result.
And step S3, performing a particle cleaning test on the whole machine, acquiring particle cleaning energy efficiency data of the whole machine, and screening the standard prototype according to the uniformity and the stability of the particle cleaning air quantity and the particle cleaning energy efficiency test result, so that the screened prototype can be used for verifying the detection capability of a laboratory on the particle cleaning air quantity and the detection capability of the laboratory on the particle cleaning energy efficiency.
A more typical air purifier is one that contains the following components:
first is the motor. The motor functions to power the air purifier. The motor drives the air flow of the air purifier, and indoor air can be actively introduced into the filtering system of the air purifier for filtering. The good motor not only can effectively save energy, but also can reduce noise and improve the purification performance of the air purifier. The main design parameters of the motor are indexes such as rotating speed, power and noise.
And secondly, a filter screen. Generally, the filter screen of the air cleaner includes two types, one is a HEPA filter screen, which is mainly used for filtering particulate matters; the other is an active carbon filter screen which is used for filtering formaldehyde, volatile organic compounds and other gaseous pollutants.
Thirdly, an air duct structure. The design of the air duct structure of the air purifier has great influence on the air quantity, noise and the like of the air purifier. If the air duct is reasonable in structural design and smooth in streamline design, resistance of air flow can be certainly reduced, and power consumption of the whole machine can be reduced under the condition of the same air quantity. On the contrary, if the structural design of the air duct is not smooth enough and does not accord with the fluid motion rule, a lot of unnecessary air quantity loss is caused, and finally the power consumption of the whole machine is increased.
Through the above description, it is known that the main component structure of an air purifier includes key components such as a motor, a filter screen, an air duct and the like. For the capability verification, because the prototype is produced by an enterprise, the motor assembled inside the air purifier body cannot be disassembled for independent measurement, and the air quantity and the input power of the whole machine are influenced by the air duct structure of the machine and the action of the motor, so that the two components are uniformly considered, and the air quantity and the input power of the air purifier body are checked and screened to achieve the purpose of checking the fan and the air duct structure.
The capability verification is aimed at verifying the detection capability of the laboratory on the clean air quantity of the particulate matters and the clean energy efficiency of the particulate matters. HEPA screens are commonly used for particulate contaminant removal. In order to simplify the model and also to make the air purifier obtained by screening more stable, the invention selects the air purifier adopting a HEPA filter screen as an alternative machine for capability verification.
The invention firstly screens the filter screen, eliminates the filter screen with larger deviation, then adopts the same filter screen to pair with various machine bodies, screens the machine bodies on the premise of eliminating the influence of the filter screen, eliminates the machine bodies with larger deviation, finally tests the combined whole machine, and screens out the machine which can be used as a capability verification sample. The invention is characterized by controlling key components: the performance parameters of the filter screen and the sample machine body enable the final verification sample with higher stability and uniformity to be screened under the condition of less sample size.
The step S1 comprises the following steps: s11) preparing a batch of filter screens with the same model, arranging the filter screens on an air duct system one by one, adjusting the air quantity of the air duct system to the rated air quantity of the filter screens, and testing the windage resistance and single filtering efficiency of each filter screen under the rated air quantity;
s12) calculating the average value of the wind resistance of the batch of filter screens, and reserving the filter screens with the deviation of the wind resistance and the average value within +/-4%;
s13) checking the filter screen screened in the step S12), and reserving the filter screen with single filtering efficiency of more than 90.0%.
The step S2 comprises the following steps:
s21) preparing a batch of prototype bodies which are matched with the filter screen and have the same model;
s22) randomly extracting one piece of filter screen selected in the step S1, respectively assembling with the sample machine body in the step S21), forming a whole machine, and performing the following test:
testing the air quantity of the whole machine;
testing the power of the whole machine;
s23) calculating the air volume average value of the whole machine in the step S22), and reserving all model machine bodies with the deviation of the air volume and the average value within +/-5%;
s24) calculating the power average value of the whole machine corresponding to the sample machine body screened in the step S23), and reserving a plurality of sample machine bodies with power deviation of +/-5% from the average value and closest to the power average value.
The specific process of step S3 is as follows:
1) Performing a particle cleaning test to obtain clean air quantity and clean energy efficiency data, and reserving a complete machine meeting the uniformity requirement;
2) Performing a vibration test on the whole machine reserved in the step 1), then performing a particle cleaning test, obtaining clean air quantity and clean energy efficiency data of the whole machine after the vibration test, comparing uniformity before sample development with stability before sample development after vibration, and reserving the whole machine meeting the stability requirement;
3) Sending the whole machine sample preserved in the step 2) to each laboratory for carrying out a particle cleaning test to obtain the industry deviation of clean air quantity and clean energy efficiency data;
4) Carrying out uniformity analysis screening on the recovered complete machine again in combination with the industry deviation;
5) And (3) carrying out a particulate matter cleaning test on the recovered complete machine, obtaining clean air quantity and clean energy efficiency data, comparing uniformity before sample distribution (before vibration) with stability after actual transportation and recovery, and reserving the complete machine meeting the stability requirement as the standard prototype.
The beneficial effects are that:
1) The invention firstly screens the filter screen, eliminates the filter screen with larger deviation, then adopts the same filter screen to pair with various machine bodies, screens the machine bodies on the premise of eliminating the influence of the filter screen, eliminates the machine bodies with larger deviation, finally tests the combined whole machine, and screens out the machine which can be used as a capability verification sample. The invention is characterized by controlling key components: the performance parameters of the filter screen and the sample machine body enable the final verification sample with higher stability and uniformity to be screened under the condition of less sample size;
2) The filter screen belongs to consumable products, the filter screen is firstly screened to obtain the basic attribute of the filter screen which can meet the requirement of the prototype, the filter screen is selected to be replaced by referring to the attribute when the filter screen is required to be replaced later, and then the complete machine screening is carried out, so that the sample size can be reduced to a great extent, the efficiency of manufacturing a standard prototype is improved, and the cost of preparing an alternative machine is reduced.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
A method of screening a standard prototype of an air purifier particulate clean air quantity test, the air purifier consisting of a filter screen and a prototype body, the method comprising the steps of:
s1: screening with a filter screen
S11) preparing a batch of filter screens with the same model, mounting the batch of filter screens on an air duct system one by one, adjusting the air quantity of the air duct system to the rated air quantity of the filter screens, and testing the windage and single-time filtration efficiency of each filter screen under the rated air quantity;
s12) calculating the average value of the wind resistance of the batch of filter screens, and reserving the filter screens with the deviation of the wind resistance and the average value within +/-4%;
s13) checking the filter screens screened in the step S12), and reserving the filter screens with single filtering efficiency of more than 90.0%.
Thus, the screening of the filter screen is completed. The step selects two most important indexes of the filter screen, excludes the filter screen with larger deviation, and finally keeps the filter screen, so that not only is the wind resistance stable, but also the single filtering efficiency is more than 90.0%.
S2: sample machine body screening
S21) preparing a batch of prototype bodies which are matched with the filter screen and have the same model;
s22) randomly extracting a filter screen from the filter screens screened in the step S1), respectively assembling the filter screen with the sample machine body in the step S21), forming a complete machine, and performing the following test:
(1) measuring the air volume of the assembled complete machine through air volume test equipment, and respectively recording;
(2) the power of the assembled whole machine is measured by a power analyzer and recorded respectively;
s23) calculating the air volume average value of the whole batch of air purifiers, and reserving a prototype body with the deviation of the air volume and the average value within +/-5%;
s24) calculating the power average value of the whole machine of the sample machine body screened in the step S23), and reserving 10 sample machine bodies with power deviation of +/-5% and closest average value.
Thus, the screening of the prototype body is completed. The step adopts the same filter screen to pair with various machine bodies, thereby eliminating the influence of the filter screen. And finally, the air quantity and the power of the reserved sample machine body are stable.
S3: screening after matching filter screen and prototype body
S31) randomly pairing the filter screen screened in the step S1 and the filter screen screened in the step S2 with a prototype body to form a complete machine of 10 air purifiers;
s32) in meeting 30m specified in GB/T18801-2015 Standard appendix A 3 In the test cabin, carrying out a particle cleaning test on the paired air purifier complete machine according to GB/T18801-2015 standard annex B;
s33) analyzing the clean air quantity and clean energy efficiency of the whole batch of air purifiers, wherein the whole batch of air purifiers meeting the requirements of uniformity and stability can meet the requirements of a particulate clean air quantity test standard prototype.
Steps S32), S33) specifically include the following steps:
1) Performing a particle cleaning test to obtain clean air quantity and clean energy efficiency data, and reserving a complete machine meeting the uniformity requirement;
2) Performing a vibration test on the whole machine reserved in the step 1), then performing a particle cleaning test, obtaining clean air quantity and clean energy efficiency data of the whole machine after the vibration test, comparing uniformity before sample development with stability before sample development after vibration, and reserving the whole machine meeting the stability requirement;
3) Sending the whole machine sample preserved in the step 2) to each laboratory for carrying out a particle cleaning test to obtain the industry deviation of clean air quantity and clean energy efficiency data;
4) Carrying out uniformity analysis screening on the recovered complete machine again in combination with the industry deviation;
5) And (3) carrying out a particulate matter cleaning test on the recovered complete machine, obtaining clean air quantity and clean energy efficiency data, comparing uniformity before sample distribution (before vibration) with stability after actual transportation and recovery, and reserving the complete machine meeting the stability requirement as the standard prototype.
If the problem of unstable samples occurs after recovery, new samples are generally purchased and then the process is carried out, but after the actual transportation is replaced by the vibration test and the samples are qualified, the condition of violent transportation in express delivery is eliminated, and the probability of the problem occurring after the samples are recovered is generally not great. Therefore, the vibration test is performed before actual transportation, which is beneficial to shortening the manufacturing period of the standard prototype.
Step S3, demonstration of a screening flow of a prototype:
uniformity determination
1. Pretreatment: taking out the air purifier complete machine (hereinafter referred to as a sample) after the pairing in the step S31), and placing the air purifier complete machine in an atmospheric environment with the temperature of 23+/-2 ℃ and the relative humidity of 45% -75% for 24 hours.
2. The demonstration adopts a sampling mode
3 sets of air purifiers are randomly selected for testing under the working conditions specified by the test operation instruction. The 3 samples were subjected to a total test, 2 times per article.
3. Evaluation method
Single factor analysis of variance
4. Sample uniformity assessment result data
The data of the uniformity evaluation results of the clean air amount of particulate matters are shown in Table 1.
TABLE 1 data on evaluation results of uniformity of clean air quantity of particulate matters (unit: m 3 /h)
The uniformity evaluation result data of the purification energy efficiency are shown in table 2.
Table 2 purification energy efficiency uniformity assessment results data units: m is m 3 /(W·h)
| Sample numbering | Test value 1 | Test value 2 |
| CVC452001-0016 | 8.86 | 8.84 |
| CVC452001-0018 | 8.74 | 8.84 |
| CVC452001-0020 | 8.75 | 8.61 |
Sample (pre-emergence) uniformity assessment analysis results are shown in table 3.
TABLE 3 evaluation of uniformity analysis results
As shown above, F is less than or equal to F0.05 (2, 3), so that the clean air quantity and the clean energy efficiency of the particulate matters of the sample are uniform.
The results of the uniformity evaluation analysis after sample retrieval are shown in table 4 (based on tables 1, 2 and the acquired industry deviation σ).
TABLE 4 evaluation of uniformity after sample retrieval analysis results
As shown in Table 4, the sample was uniform because the amount of particulate matter clean air and the purification energy efficiency of the sample both satisfy Ss.ltoreq.0.3σ criterion.
Note that: ss is the standard deviation of non-uniformity between samples, σ is the standard deviation of testing in the industry.
4. Conclusion(s)
All 3 samples met the uniformity requirement.
Stability determination
1. Sample selection mode
After uniformity testing (before sample development), the samples were subjected to vibration testing and 3 samples were subjected to total inspection, each repeated 2 times.
Random vibration tests were performed according to GB/T4857.23-2012, with test conditions as shown in Table 5.
TABLE 5
2. Evaluation method
The stability of the samples was analyzed using the t-test method.
3. Stability assessment result data
The data of the evaluation results of the stability before sample development of the clean air amount of particulate matters are shown in Table 6.
TABLE 6 evaluation of the stability of the amount of air to clean particulate matter before sample development (unit: m) 3 /h)
| Sample numbering | Test value 1 | Test value 2 |
| CVC452001-0016 | 264.7 | 278.1 |
| CVC452001-0018 | 270.7 | 274.6 |
| CVC452001-0020 | 270.7 | 268.6 |
Table 7 purification energy efficiency stability assessment results data unit prior to sample development: m is m 3 /(W·h)
| Sample numbering | Test value 1 | Test value 2 |
| CVC452001-0016 | 8.48 | 8.97 |
| CVC452001-0018 | 8.65 | 8.80 |
| CVC452001-0020 | 8.70 | 8.66 |
The results of the uniformity before sample development and the stability after sample development after vibration are shown in Table 8, and are used for observing whether the parameters of the samples remain stable.
TABLE 8 evaluation of stability of articles analysis results
From the above table, it can be seen that: all 3 samples met: the calculated t statistic is less than t α(10) Critical.
Stability test after sample recovery:
the stability assessment data after sample recovery are shown in table 9.
TABLE 9
The stability assessment data after sample recovery are shown in table 10.
Table 10
By means ofThe standard method analysis capability verifies the stability of the sample, uniformity before sample distribution and stability comparison analysis after real transportation and recoveryThe results are shown in Table 11 and are used to assess whether the sample continued to stabilize.
TABLE 11
Is the mean value of the test values in tables 1, 2, < >>Is the mean of the test values in tables 9, 10. From the above table, it can be seen that: all 3 items of capability verification satisfy +.>Criteria, sample characteristics meet stability requirements;
4. conclusion(s)
From the above, it is known that the sample characteristics meet the stability requirements.
From the above demonstration example, we can see that the 3 air purifiers to be inspected all meet the conditions of uniformity and stability, and can be used as a standard prototype of the invention, and further prove that the invention controls key components by controlling: the performance parameters of the filter screen and the sample machine body can indeed enable the user to screen out the capability verification sample with higher stability and uniformity under the condition of smaller sample size.
Claims (6)
1. A method for screening a standard prototype for testing the amount of particulate matter and air in an air purifier, wherein the air purifier consists of a prototype body and a filter screen, and a plurality of prototype bodies and a plurality of filter screens are prepared, and the method is characterized by comprising the following steps:
s1: screening the filter screen according to the wind resistance and the single filtering efficiency of the filter screen, and removing the filter screen with larger deviation;
s2: randomly extracting one filter screen from the filter screen screened in the step S1, respectively assembling the filter screen with each sample machine body to form a complete machine, screening the sample machine bodies according to the air quantity and the power test result of the complete machine, and removing sample machine bodies with larger deviation;
s3: randomly pairing the filter screen screened in the step S1 and the filter screen screened in the step S2 with the sample machine body to form a plurality of complete machines, carrying out a particle cleaning test on the complete machines, and screening the standard sample machine according to the uniformity and the stability of the particle cleaning air quantity test result.
2. The method according to claim 1, wherein the step S3 is performed on the whole machine, and the obtained data further include the data of the purifying energy efficiency of the particulate matters, and then the standard prototype is selected according to the amount of the purifying air of the particulate matters and the uniformity and stability of the testing result of the purifying energy efficiency of the particulate matters.
3. The method of claim 2, wherein the screen is a HEPA screen.
4. A method according to claim 3, wherein step S1 comprises: s11) preparing a batch of filter screens with the same model, arranging the filter screens on an air duct system one by one, adjusting the air quantity of the air duct system to the rated air quantity of the filter screens, and testing the windage resistance and single filtering efficiency of each filter screen under the rated air quantity;
s12) calculating the average value of the wind resistance of the batch of filter screens, and reserving the filter screens with the deviation of the wind resistance and the average value within +/-4%;
s13) checking the filter screen screened in the step S12), and reserving the filter screen with single filtering efficiency of more than 90.0%.
5. The method according to claim 4, wherein step S2 comprises: s21) preparing a batch of prototype bodies which are matched with the filter screen and have the same model;
s22) randomly extracting one piece of filter screen selected in the step S1, respectively assembling with the sample machine body in the step S21), forming a whole machine, and performing the following test:
testing the air quantity of the whole machine;
testing the power of the whole machine;
s23) calculating the air volume average value of the whole machine in the step S22), and reserving all model machine bodies with the deviation of the air volume and the average value within +/-5%;
s24) calculating the power average value of the whole machine corresponding to the sample machine body screened in the step S23), and reserving a plurality of sample machine bodies with power deviation of +/-5% from the average value and closest to the power average value.
6. The method according to claim 5, wherein the step S3 is specifically as follows:
1) Performing a particle cleaning test to obtain clean air quantity and clean energy efficiency data, and reserving a complete machine meeting the uniformity requirement;
2) Performing a vibration test on the whole machine reserved in the step 1), then performing a particle cleaning test, obtaining clean air quantity and clean energy efficiency data of the whole machine after the vibration test, comparing uniformity before sample development with stability before sample development after vibration, and reserving the whole machine meeting the stability requirement;
3) Sending the whole machine sample preserved in the step 2) to each laboratory for carrying out a particle cleaning test to obtain the industry deviation of clean air quantity and clean energy efficiency data;
4) Carrying out uniformity analysis screening on the recovered complete machine again in combination with the industry deviation;
5) And carrying out a particle cleaning test on the recovered complete machine, obtaining clean air quantity and clean energy efficiency data, comparing uniformity before sample distribution with stability after actual transportation and recovery, and reserving the complete machine meeting the stability requirement as the standard sample machine.
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