1、Designation: F884 01 (Reapproved 2011)An American National StandardStandard Test Method forMotor Life Evaluation of a Built-In (Central Vacuum) VacuumCleaner1This standard is issued under the fixed designation F884; the number immediately following the designation indicates the year of originaladopt
2、ion or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method is limited to motor life evaluation ofcentral vacuum cleaner
3、s.1.2 This test method provides a test to determine operatinglife of the motor, before servicing is needed, by an acceleratedlaboratory procedure. The motor is tested while mounted and isoperated in central vacuum cleaner.1.3 The values as stated in inch-pound units are to beregarded as the standard
4、. The values in parentheses are forinformation only.1.4 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
5、 regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E337 Test Method for Measuring Humidity with a Psy-chrometer (the Measurement of Wet- and Dry-Bulb Tem-peratures)F431 Specification for Air Performance Measurement Ple-num Chamber for Vacuum CleanersF608 Test Method for
6、Evaluation of Carpet Embedded DirtRemoval Effectiveness of Household/Commercial VacuumCleaners3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 failuremotor stoppage.3.1.2 motor lifelimited by the failure of the motor. Anyfailure integral with motor, such as armature assembly, f
7、ieldassembly, housing(s), bearings, motor cooling fan and primaryair moving fan, or both, brush assemblies, motormountednonresetable thermal protection devices, or any other compo-nent judged to be integral with the motor, shall be judged asmotor stoppage.4. Significance and Use4.1 The test results
8、provide an indication of the motor life ofan electric vacuum cleaner. The end of the motor life will bejudged in accordance with Section 3.5. Apparatus and Materials5.1 Voltage Regulator Systemto control the input voltageto the vacuum cleaner. The regulator must be capable ofmaintaining the Central
9、Vacuums rated voltage 61 % andrated frequency 61 Hz with a waveform that is essentiallysinusoidal with 3 % maximum harmonic distortion for theduration of the test.5.2 Voltmeter, to provide measurements accurate to within61%5.3 Timer and SwitchThe timer and switch shall have thecapacity to control th
10、e off/on duty cycle of the cleaner duringthe life test.5.4 Sharp Edge Orifice PlateThe orifice, 0.75 in. (19.05mm) in diameter, shall be in accordance with the figureillustrating orifice plate detail in Specification F431.5.5 Wattmeter, to provide measurements accurate to within1%.5.6 Plenum Chamber
11、, in accordance with the plenum cham-ber described in Specification F431.5.7 Water Manometer, or equivalent instrument measuringin increments of 0.1 in. (2.54 mm).5.8 Barometer, with an accuracy to 60.05 in. (1.27 mm)Hg, capable of measuring uncorrected barometric pressure (teststation pressure) wit
12、h scale division 0.02 in. (0.51 mm) or finer.5.9 Thermometer, having a range from 18 to 80F (8 to27C) and graduated in 1F (0.5C) increments.1This test method is under the jurisdiction ofASTM Committee F11 on VacuumCleaners and is the direct responsibility of Subcommittee F11.30 on Durability-Reliabi
13、lity.Current edition approved Nov. 1, 2011. Published March 2012. Originallyapproved in 1990. Last previous edition approved in 2006 as F884 01 (2006).DOI: 10.1520/F0884-01R11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. Fo
14、r 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.5.10 PsychrometerThe psychrometer shall meet the re-quirements of Test
15、 Method E337 with thermometers graduatedin increments of 1F (0.5C).5.11 Test FixtureAny suitable surface that will support thevacuum cleaner in the normal operating position.6. Sampling6.1 Test a minimum of three units (or a larger sample size ifdesired) of similar models using the same motor style
16、andamperage. Select all samples at random in accordance withgood statistical practice. Results shall provide an 80 % confi-dence level within 610 % of the mean value. If not, testadditional samples or reduce the results by the penalty factor ascalculated in 7.9.7. Procedures for Motor Life Evaluatio
17、n7.1 Determine initial performance as follows:7.1.1 Connect the manometer (or equivalent) to the plenumchamber. Install a new filter bag in the test cleaner, if required,before conducting performance tests.7.1.2 With a minimum length of 2 in. inside diameter tubingsealed to the plenum chamber and to
18、 the cleaner, and withoutan orifice plate in the holder, energize the cleaner at its ratedvoltage 61 % and rated frequency 61 Hz for 5 min to stabilizemotor temperatures. For vacuum cleaners with dual nameplatevoltage rating, conduct testing at the highest voltage.7.1.3 With the cleaner operating at
19、 a constant rated voltage,insert the 0.75-in. (19.05-mm) diameter sharp-edge orifice intothe holder on the orifice box.7.1.4 Record the suction and input power in that order assoon as the manometer reading stabilizes.7.1.4.1 Take the manometer reading as soon as the manom-eter reaches a true peak. (
20、On higher manometer readings, theliquid level may peak, drop, and peak a second time. Thesecond peak is the true peak reading. A person conducting thetest for the first time shall observe at least one run beforerecording data. See Specification F431 for instructions on howto minimize the overshoot (
21、first peak) of the liquid level).7.1.4.2 Take all readings within 10 s of the orifice plateinsertion.7.1.5 The input power reading is used to monitor the cleanerload.7.1.6 Monitor the input power, the suction, or both, dailyand measure on the plenum chamber every 168 h to ensure thata load is mainta
22、ined; that no mechanical problem has devel-oped; and that the performance has not degraded by more than40 %. If degradation exceeds 40 %, see 7.7.1 and 7.7.2.7.2 Install the cleaner on the test fixture with a 0.75-in.(19.05-mm) diameter sharp-edge orifice in the cleaner inletopening.7.3 If various s
23、ettings are provided, set the motor speedsetting and the suction regulator, or a combination of these, inaccordance with the manufacturers specified setting for usingthe cleaner on the level loop test carpet. The setting shall be thesame as that which is used for the cleanability of embedded dirtcar
24、pet test in Test Method F608.7.4 If the cleaner under test is equipped with a disposablefilter bag or reusable filter bag, it should be replaced or cleanedevery 168 h of cycling time during the life test. The manufac-turers recommended cleaning procedure is to be used when-ever specified in instruct
25、ion booklets. Where no procedure isspecified, replace reusable filters. When a new or cleaned filteris placed in the cleaner, check the cleaner on the plenumchamber for degradation of performance in accordance with7.7.1 and 7.7.2.7.5 Perform all tests in a controlled ambient atmospherewith a dry-bul
26、b temperature from 68 to 81F (20 to 27C) anda relative humidity of 30 to 50 %.7.6 Operate the cleaner at the voltage specified in 7.1.2 froma remote on/off switch and timer with a duty cycle of 8 min ofoperation, followed by 2 min off.7.7 Test for degradation of performance every 168 h ofcycling tim
27、e.7.7.1 Performance DegradationIn accordance with theprocedure in Annex A1, use the suction at the start of the testas the base for determining the 40 % degradation of perfor-mance (see 7.1.4).7.7.2 If degradation is present, determine and correct thecause. Replace any part, except the motor or its
28、integral partsto bring the system within performance limits, and continue thetest until the motor stops.7.8 Judge the end of the test in conformity with Section 3.Express life in terms of “on” hours only.7.9 Calculate an estimate of the population mean in accor-dance with the following procedure:7.9
29、.1 Calculate sample mean for units tested and confidenceinterval half-width.x 5(i 5 1nxih 5ts=nwhere:x = mean of sample,n = sample size,xi= life, in hours of “on” time, for each sample tested,h = half-width of confidence interval,t = value from t distribution table for 80 % (t0.90) confi-dence level
30、 and df = n1 (see Table 1), ands = standard deviation of sample.7.9.2 Compare sample mean and confidence interval half-width to determine if a penalty factor is required:TABLE 1 Percentiles of the t Distributiondf t0.901 3.0782 1.8863 1.6384 1.5335 1.4766 1.4407 1.4158 1.3979 1.38310 1.37211 1.36312
31、 1.35613 1.35014 1.34515 1.341F884 01 (2011)2A: If h # 0.1 x, use x as published value.B: If h 0.1 x, test additional units to meet confidence level oruse following penalty factor (D):D5h 2 0.1xUse x D as published value.8. Precision and Bias8.1 PrecisionA meaningful precision statement cannot bemad
32、e due to the number of components in the motor, each ofwhich could constitute failure of the motor.8.2 BiasBias does not apply because there is no standardreference for comparison.9. Keywords9.1 central vacuum; degraded; failure; life evaluation; motorANNEXES(Mandatory Information)A1. METHOD FOR DET
33、ERMINING 40 % OF PERFORMANCEA1.1 One requirement for life test is to ensure thatairflow/suction performance at the central vacuum cleaner inlethas not degraded below 40 % of original. This ensures suctionloading on the motor. This degradation can be based on areduction of initial suction since there
34、 is a direct relationshipbetween suction and airflow. Determine the point at whichsteps must be taken to correct the airflow loss based on suctionas follows:h25 0.36 h1where:h2= suction at monitoring point, in. (mm), andh1= initial suction, in. (mm).Therefore, instead of setting up the test unit on
35、the orificebox to determine airflow for calculating degradation of perfor-mance every 168 h during the test, all that is required is tomeasure the suction, correct it, and as long as h2 0.36 h1, thetest requirement for airflow/suction load is maintained.3A1.2 Derivation:Q15 21.844D2K=h1Since D2and K
36、 are constants, then Q1/Q25=h1/=h2andQ25 0.6 Q1at the point when servicing may be required.Therefore, Q1/0.6Q15=h1/=h2,or=h25 0.6=h1orh2= 0.36 h1at the servicing point.A1.3 Terms:Q1= initial airflow,Q2= airflow at servicing point,h1= initial suction,h2= suction at failure point, andD = orifice diame
37、ter.A2. CORRECTION OF DATA TO STANDARD CONDITIONSA2.1 Air Density RatioThe density ratio, Dris the ratioof the air density at the time of test, rtest, to the standard airdensity, rstd= 0.0750 lb/ft3(1.2014 kg/m3). It is used to correctthe vacuum and wattage readings to standard conditions. Findrtest
38、from standard psychrometric charts or ASHRAE tablesand calculate Drfrom the following equation:Dr5rtestrstdAs an alternative use the following equation:Dr5 17.68 Bt2 0.001978 Tw21 0.1064 Tw1 0.002475 BtTd2 Tw! 2 2.741!where:Bt= test station pressure at time of test in. Hg,Td= dry-bulb temperature at
39、 time of test, F, andTw= wet-bulb temperature at time of test, F.NOTE A2.1This equation is intended for use in correcting the ambientconditions where the barometric pressure exceeds 27 in. Hg. and the dry-and wet-bulb temperature are less than 100F (37.8C).A2.2 Corrected SuctionCalculate the correct
40、ed suction,hsas follows, h, times the correction factor Cs, or:hs5 Cs3 h3A suction fixture as shown in Fig. A1.1 can be used for this purpose.F884 01 (2011)3where:h = manometer reading, andCs= correction factor.A2.3 For series universal motors, calculate the correctionfactor, Csas follows:Cs5 1 1 0.
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44、STM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the ab
45、oveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).NOTE 1MATL: AISI 4130 STEEL H.T. to RC 42-47FINISH: BLACK OXIDEALT MATL 316 STAINLESS STEELFIG. A2.1 Suction FixtureF884 01 (2011)4
