ASTM F922-2001(2006) Standard Test Method for Motor Life Evaluation of an Electric Motorized Nozzle《家用电动喷头的电动机寿命评估的标准试验方法》.pdf

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1、Designation: F 922 01 (Reapproved 2006)An American National StandardStandard Test Method forMotor Life Evaluation of an Electric Motorized Nozzle1This standard is issued under the fixed designation F 922; the number immediately following the designation indicates the year oforiginal adoption or, in

2、the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the motorized nozzle used withhousehold or commercial vacuu

3、m cleaner systems, that is,combination cleaners.1.2 This test method provides a test for determining oper-ating motor life in hours by an accelerated laboratory proce-dure. The motors are tested while mounted and operated in themotorized nozzle.1.3 This test method covers only the motorized nozzle.

4、Thesystem used to provide the airflow source is not underconsideration.1.4 This test method is limited to the determination of motorlife for an electrically powered household or commercialmotorized nozzle.1.5 The values stated in inch-pound units are to be regardedas the standard. The values given i

5、n parentheses are forinformation only.1.6 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory li

6、mitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D75 Practice for Sampling AggregatesE 337 Test Method for Measuring Humidity with a Psy-chrometer (the Measurement of Wet- and Dry-Bulb Tem-peratures)F 431 Specification for Air Performance Measurement Ple-num Chamber for Vacuum Clean

7、ersF 608 Test Method for Evaluation of Carpet Embedded DirtRemoval Effectiveness of Household/Commercial VacuumCleanersF 655 Specification for Test Carpets and Pads for VacuumCleaner Testing3. Terminology3.1 Description of Term Specific to This Standard:3.1.1 motor lifelimited by failure of the moto

8、r. Failure ismotor stoppage.3.1.1.1 DiscussionAny failure integral with the motorsuch as armature assembly, field assembly, housing(s) bear-ings, motor cooling fan, carbon brush assemblies, motor-mounted nonresettable thermal protective devices, or any othercomponent judged to be integral with the m

9、otor shall be judgedas motor stoppage.4. Significance and Use4.1 The test results provide an indication of the motor life ofan electric motorized nozzle. End of motor life will be judgedin accordance with Section 3.5. Apparatus and Materials5.1 Voltage Regulator System, to control the input voltage

10、tothe vacuum cleaner. The regulator system shall be capable ofmaintaining rated voltage 61 % and rated frequency 61Hzofthe motorized nozzle having a wave form that is essentiallysinusoidal with 3 % maximum harmonic distortion for theduration of the test.5.2 Voltmeter, to provide measurements accurat

11、e to within61%.5.3 Timer and Switch, having the capacity to control theoff/on duty cycle of the nozzle and air flow source during thelife test.5.4 Wattmeter, to provide measurements accurate to within1%.5.5 Sharp-Edge Orifice Plate,a114-in. (32-mm) diametershall be in accordance with the orifice pla

12、te illustrated inSpecification F 431.5.6 Plenum Chamber, conforming to the plenum chamberspecifications in Specification F 431.5.7 Water Manometer, or equivalent instrument measuringin increments of 0.1 in. (2.54 mm).1This test method is under the jurisdiction ofASTM Committee F11 on VacuumCleaners

13、and is the direct responsibility of Subcommittee F 11.30 on Durability-Reliability.Current edition approved Jan. 1, 2006. Published January 2006. Originallyapproved in 1988. Last previous edition approved in 2001 as F 922 01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcon

14、tact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.8 Barometer, with a

15、n accuracy of 60.05 in. Hg (1.27 mmHg), capable of measuring uncorrected barometric pressurewith scale divisions of 0.02 in. (0.51 mm) or finer.5.9 Thermometer, having a range of at least 18 to 80F (8to +27C) and graduated in 1F (0.5C) increments.5.10 Psychrometer, meeting the requirements of TestMe

16、thod E 337 with thermometers graduated in increments of1F (0.5C).5.11 Test Carpet, conforming to the level loop carpet asdescribed in Specification F 655.Acarpet that provides equiva-lent nozzle loading results may be used.5.12 Carpet Padding (optional), if used, the test carpetpadding will conform

17、to the padding described in SpecificationF 655.5.13 Test Cleaner or Airflow SourceThe motorized nozzlemotor life evaluation tests shall be conducted using the airflowsource and voltage resulting from the components whichcomprise the combination system with which the motorizednozzle is to be used. If

18、 used with several systems, the one withthe maximum airflow shall be used.5.13.1 OptionA simulated airflow source and adjustedvoltage may be used if they are equal to or exceed thecombination system with which the motorized nozzle is to beused.5.14 Test FixtureA moving surface, covered by the testca

19、rpet supported on the test pad, which moves with a horizon-tal reciprocating motion, for a stroke distance of 27 in. (686mm) in each direction at the average rate of 1.8 ft/s (0.55 mps),which results in 24 cpm (forward and back). This motion shallbe generated by rotating a 13.5-in. (343-mm) radius a

20、rm thatshall be connected to the platform with an arm at least 24 in.(610 mm) long or equivalent. This device shall provide meansto hold the motorized nozzle fixed by its handle stationary inthe operating position while it is in contact with the recipro-cating surface.5.14.1 OptionThe motorized nozz

21、le can be movedthrough the same cycle as stated in 5.14 while the carpetedplatform is held stationary. See Fig. 1. For either option, thereciprocating motion shall follow the same duty cycle asspecified for the vacuum cleaner or airflow source and motor-ized nozzle in 7.7. For the optional test fixt

22、ure of Fig. 1, thereciprocating arm must be at either end of its horizontal motionat the start of each “on” portion of the cycle. The vacuumcleaner or airflow source shall be stationary and positioned sothat the hose will be submitted to minimum stresses.5.15 Test Dirt, Wedron sand/talc mixture. See

23、 Annex A1.6. Sampling6.1 Test a minimum of three units (or a larger sample size ifdesired) of similar models using the same motor style andamperage. Select all samples at random in accordance withgood statistical practice. Results shall provide an 80 % confi-dence level within 610 % of the mean valu

24、e. If not, testadditional samples or reduce the results by the penalty factor ascalculated in 7.12.7. Procedure7.1 Determine initial performance. The suction of thecleaner or airflow source with the motorized nozzle attached isto be determined to ensure that no leaks develop to reduce loadon the noz

25、zle. For the test, the nozzle opening is to be sealedto the ASTM plenum chamber with manometer (or equivalent)connected to the chamber, and with the sharp-edge orifice platein the holder. The motorized nozzle is to have the agitator drivebelt connected and a new filter bag in the cleaner or airflows

26、ource. The agitator shall be operating freely with the handle inoperating position as shown in Fig. 1.7.1.1 With the motorized nozzle opening sealed to theplenum chamber and without an orifice plate in the holder,energize the cleaner and motorized nozzle at rated voltage 1%and rated frequency 1 Hz f

27、or 5 min to stabilize motortemperatures. See 5.13 if an optional airflow source is used.7.1.2 With the motorized nozzle operating at rated voltage61 % and rated frequency 61 Hz and the airflow source at therequired voltage, insert the sharp-edge orifice plate into theholder on the orifice box, in ac

28、cordance with 5.5 and 5.6.7.1.3 Record the manometer reading of the combined powernozzle and airflow source as soon as the reading stabilizes.7.1.4 Record the wattage of the nozzle on the plenumchamber. The wattage reading is used to monitor the nozzleload.7.1.5 Repeat the test, recording the manome

29、ter and wattagereading of the cleaner or airflow source connected only to theplenum chamber.7.1.6 The airflow and wattage reading shall be measuredevery 168 h to determine if some component has failed andFIG. 1 Test FixtureF 922 01 (2006)2degraded performance, reducing the load on the nozzle duringt

30、he life test. If degradation exceeds 40 % see 7.10.7.1.7 Monitor the suction at the motorized nozzle dailyduring the test, in addition to the weekly measurement on theplenum chamber, to maintain loading and to ensure that nomechanical problems exist.7.2 Use a new section of carpet and padding in acc

31、ordancewith 5.11 and 5.12 without holes, tears, or other signs of wearwhen the test is started. Tautly secure the carpet. The lay of thecarpet pile shall be such that during the forward stroke thepowered nozzle moves in the direction of the lay of the carpetpile. See Fig. 1. Measure the carpet pile

32、height to determinecarpet wear in accordance with 7.5.1.7.3 Install the motorized nozzle on the test fixture, as shownin Fig. 1, with the nozzle connected to the airflow source.7.4 If various settings are provided, set the motor speed,suction regulator, nozzle height, or a combination thereof, inacc

33、ordance with the manufacturers specified setting for usingthe nozzle on the level loop test carpet and pad. The settingshall be the same as that used for Test Method F 608.7.5 Keep the load within limits by controlling changes in thecarpet, agitator brush, drive belt, or airflow source or replacingc

34、omponents as determined in 7.5.1-7.5.4.7.5.1 Replace the carpet when one fourth of the pile heightis worn away, as measured in the center one third of the stroke,except at the beginning and end of the stroke path.7.5.2 During the life test, change the agitator brush every168 h of cycling time.7.5.3

35、Change drive belts every 168 h of cycling time or ifthey cease to drive the agitator on the test carpet prior to 168h. Replace positive drive belts if they cease to function asintended.7.5.4 During the life test, change the disposable filter orclean the reusable primary and secondary filter every 16

36、8 h ofcycling time or when the airflow decreases 40 % due to filterclogging.To determine if the filters must be changed or cleanedprior to the 168-h period, an initial dust clogging test shall beconducted in accordance with the procedure described inAnnex A4.7.6 Perform all tests in a controlled amb

37、ient with a dry-bulbtemperature of 68 to 81F (20 to 27C) and with a relativehumidity of 30 to 50 %.7.7 Operate the vacuum cleaner or airflow source (see 5.13)at a required voltage to obtain the desired airflow through themotorized nozzle. Operate the motorized nozzle at its regulatedand applicable v

38、oltage. Operate the vacuum cleaner or airflowsource and motorized nozzle from a remote on-off switch andtime with a duty cycle of 8 min of operation followed by 2 minoff following the cycle condition set forth in 5.14.7.8 Measure the suction of the motorized nozzle with theairflow source initially a

39、nd daily on the test fixture to providea base line for identifying if degradation has occurred. The unitcan then be removed and tested on the plenum chamber todetermine if it exceeds the degradation limitation in accordancewith 7.11.1 and 7.11.2.7.9 Spread 10 g of the standard dirt mixture (Annex A1

40、)atthe start of the test and once every 24 h of cycling time on thetest carpet. Spread evenly over the area traversed by the nozzleopening.7.10 Test for degradation of performance every 168 h ofcycling time.7.10.1 Airflow LossIn accordance with the procedure inAnnexA2, the suction at the start of th

41、e test, 7.1.3, is to be usedas the base for determining the 40 % degradation of perfor-mance. Measure suction with and without the motorized nozzleto ensure degradation is in the motorized nozzle. If degradationis in the airflow source, replace or repair the airflow source andcontinue test. If degra

42、dation is in the motorized nozzle,determine and correct the cause. Replace or repair any part,except the motor, to bring the system within performance limitsand continue the test.7.11 Judge the end of the test in conformance with Section3. Express life in terms of “on” time (hours) only.7.12 Calcula

43、te an estimate of the population mean in accor-dance with the following procedure:7.12.1 Calculate the sample mean for units tested and theconfidence interval half-width:x 5(i 5 1nxi(1)h 5ts=nwhere:x = mean of sample,n = sample size,xi= life, in hours of “on” time, for each sample tested,h = half-wi

44、dth of confidence interval,t = value from t distribution table for 80 % (t0.90) confi-dence level and degrees of freedom = n 1 (see be-low), ands = standard deviation of sample.Percentiles of the t DistributionDegrees of Freedom t0.901 3.0782 1.8863 1.6384 1.5335 1.4766 1.4407 1.4158 1.3979 1.38310

45、1.37211 1.36312 1.35613 1.35014 1.34515 1.3417.12.2 Compare the sample mean and confidence intervalhalf-width to determine whether a penalty factor is required:(1) If h # 0.1 x, use xas the published value.F 922 01 (2006)3(2) If h 0.1 x, test additional units to meet the confidencelevel, or use the

46、following penalty factor (D):D5h 2 0.1 x (2)Use x D as the published value.8. Precision and Bias8.1 PrecisionAmeaningful statement cannot be made dueto the number of components in the motor, each of which couldconstitute failure of the motor.8.2 BiasA bias statement cannot be applied to this testmet

47、hod as there is no standard reference for comparison.9. Keywords9.1 durability; electric motorized nozzle; standard testmethod; vacuum cleanerANNEXES(Mandatory Information)A1. DIRT MIXTUREA1.1 Test DirtA1.1.1 Ten grams of the test dirt consists of the following:90%(wt)9gofsilica sand3and10%(wt)1gofu

48、nscented commercial-grade talcum4A1.2 Analysis of Silica SandSieve Range(U.S. No.)Particle Size (m) Amount Used (g)30 to +40 600 to 425 0.0940 to +50 425 to 300 3.1550 to +70 300 to 212 4.1470 to +100 212 to 150 1.35100 to +140 150 to 106 0.27A1.3 Analysis of Unscented Commercial-Grade TalcumDistrib

49、ution by Weight (%) Particle Size Range (m)0.5 4412.5 20 to 43.927.0 10 to 19.923.0 5 to 9.920.0 2 to 4.98.0 1 to 1.99.0 0.36h1, thetest requirement for airflow/suction load is maintained.A2.2 Derivation:Q15 21.844 D2K=h1(A2.2)Since D2and K are constants, then Q1/Q2=h1/=h2and Q2= 0.6 Q1at the point when servicing may be required.Therefore, Q2/0.6Q1=h1/=h2, or h2= 0.6Q1,orh2= 0.36, h1at the servicing point.3The sole source of supply of silica sand known to the committee at this time isWedron No. 504 Unground Silica Sand, available from Wedro