各品牌奶瓶负压对比测试报告.pdf

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1、ComparisonofvacuumpreventioncapabilityofvariousbabyfeedingbottlesShaharSeifer,PhD12Aug2013不同奶瓶防瓶内负压效果对比（仅翻译梗概）ShaharSeifer博士，2013年8月12日AbstractThepressuredifferenceformedinbottlesduringsteadypumpingratewasmeasuredovertime.Differenceswerefoundintheabilitytoreducevacuumam

2、ongvariousbrandsofbabybottles.摘要通过稳定的泵排量来检测瓶内压力的变化，发现不同品牌奶瓶降低瓶内负压的能力有所不同。Method方法ThemeasurementsetupisshowninFig.1.ThepressuresensorisHoneywellControlSystems26PCBFA6D,whichisadifferentialsensorwithonesideopenedtotheair,has0‐5PSIrangeofbestaccuracy,10mV/PSIsensitivity,ma

3、xoverpressureof20PSI(14.7PSIisthehighestvacuumpossibleequalsto1atmosphere).ThesensorisamplifiedwithAnalogDevicesAD626amplifieratgainof10,andtheoutputvoltageissampledbyKeithley2700inDCVoltsandtheresultsareacquiredbyPC.Thepressuredifferenceinthebottle(comparedtooutsideair

4、)withchoiceofsignpositiveforvacuumiscalculatedas:Pressure[PSI]=(Results[Volts] ‐ 0.18)*10测量仪器的设置如下图1，压力传感器是Honeywell26PCBFA6D,一端向外开口，精度达0‐5PSI，灵敏度达10mV/PSI，最大超压20PSI（一个大气压相当于14.7PSI），传感器通过模拟装置AD626放大器放大增益到10，输出为直流电压Keithley2700，通过电脑获取数据。瓶内压力差（与外界气压对比）计算公式为：压力(PSI)=（电压伏‐

5、0.18）*101PCKeithlePowe2700bottlePressurePeristalticsensorpumpwithamplifierFig.1.Measurementsetup测试装置图Thepressuresensorisconnectedwithapipetoasealedconnectorplacedonawallofthebottlenearitsbase,aftermakingaholeof5mmdiameter.Theconnectorismadefromaventileofwhichtheinnerrub

6、berremoved,withtwogasketsandwashers,closedwithamatchingnutontheinnersideofthebottle(Fig.2).Thebottleisfilledwithtapwateratroomtemperatureandthewaterispumpedoutfromtheedgeofthefeedingteatusingasealmadeofaconnectorusedinaninfusionbagandacylinderof11mmoutsidediameterforcou

7、ntersupport(Fig.3).Thetipoftheinfusionbagisforcedinsidethecylinderuptoclosestcontact.Thetipisinsertedviathemainholeinthefeedingteatwhiletherestholesaresealedbythepressedsiliconrubber.Thebottlewasheldupsidedownandthepipeforthepressuresensorwasemptiedofwaterbeforestarting

8、measurements.压力传感器通过管子与密封的连接器联接，在瓶底附近钻个5mm左右的洞后放置好连接器，连接器有两个垫圈和垫片，通过螺母固定在瓶身上，如下图2，瓶子装上常温的自来水，然后用输液袋连接器密封和一个外径1