DIN VDE 0700 T.43-1992 家用及类似用途电器的安全.第2部分:衣服烤干器和毛巾晾晒板的特殊要求
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【英文标准名称】:Safetyofhouseholdandsimilarelectricalappliances;part2:particularrequirementsforclothesdryersandtowelrails(IEC60335-2-43:1984,modified);germanversionEN60335-2-43:1989+A1:1990
【原文标准名称】:家用及类似用途电器的安全.第2部分:衣服烤干器和毛巾晾晒板的特殊要求
【标准号】:DINVDE0700T.43-1992
【标准状态】:作废
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【发布单位】:德国标准化学会(DE-DIN)
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【标准类型】:()
【标准水平】:()
【中文主题词】:
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【摘要】:
【中国标准分类号】:
【国际标准分类号】:
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【英文标准名称】:Drysealpipethreads(inch)
【原文标准名称】:干封管螺纹(英制)
【标准号】:ASMEB1.20.3-1976
【标准状态】:现行
【国别】:美国
【发布日期】:1976-11-18
【实施或试行日期】:
【发布单位】:美国机械工程师协会(US-ASME)
【起草单位】:ASME
【标准类型】:()
【标准水平】:()
【中文主题词】:尺寸;规范;管;螺纹;管螺纹;名称与符号
【英文主题词】:Designations;Dimensions;Pipethreads;Pipes;Specification;Threads
【摘要】:DrysealpipethreadsarebasedontheUSA(American)pipethread,however,theydifferfromtheUSA(American)pipethreadinthattheyaredesignedtosealpressuretightjointswithoutthenecessityofusingsealingcompounds.Toaccomplishthissomemodificationofthreadformandgreateraccuracyinmanufactureisrequired.Therootsofboththeexternalandinternalthreadsaretruncatedslightlymorethanthecrests,Le.rootshavewiderflatsthancrests,sothatmetal-to-metalcontactoccursatthecrestsandrootscoincidentwithorpriortoflankcontact,seeFigure1.Thusasthethreadsareassembledbywrenching,therootsofthethreadscrushthesharpercrestsofthematingthreads.Thissealingactionatboththemajorandminordiameterstendstopreventspiralleakageandmakesthejointspressuretightwithoutthenecessityofusingsealingcompounds,providedthatthematingthreadsareinaccordancewithstandardspecificationsandtolerancesandarenotdamagedbygallinginassembly.Thecontrolofcrestandroottruncationissimplifiedbytheuseofproperlydesignedthreadingtools.Also,itisdesirablethatbothexternalandinternalthreadshavefullthreadheightfortheLIlength.However,wherenotfunctionallyobjectionable,theuseofacompatiblelubricantorsealantmaybeusedtominimizethepossibilityofgalling.ThisisdesirableinassemblingDrysealpipethreadsinrefrigerationandothersystemstoeffectapressuretightseal.1.1.1InordertoobtainapressuretightsealusingDrysealpipethreadswithoutasealer,itisnecessarytoholdcrestandroottruncationofbothinternalandexternalthreadswithinthelimitsspecified.Unlessthisisdonebyuseofthreadingtoolswiththecrestandroottruncationcontrolledsoastoassurerepro-ductionontheproductthreads,itisnecessarytouseasystemofmeasuringorasystemofgagingandmeasuringtodetermineconformance.1.1.2Evenwithouttruncationgages,thestandardpracticeofusingtwoseparatethreadgagesforDrysealpipethreads,eachwithadifferenceintruncation,lengthofengagementandpointofengagement,providesamoredetailedcheckofangle,leadandtaperdeviationsthanisrequiredfornon-drysealtaperpipethreads.1.I.3Onemethodofcheckingcresttruncationisbyusing6stepplaingages.Itshouldberecognizedthatthismethodmaygivemisleadingresultsinthatthecresttruncationoftheproductthreadsisalwaysless(flatnarrower)thanthatindicatedbythepositionofthegages,thedegreeofinconsistencydependingontheangle,leadandtaperdeviationspresentintheproductthread.1.1.4Anothermethodemploysbothcrestandroottruncationcheckgages.Therootcheckgageismadewithathreadformhavinganincludedangleof50degreesandwithasmallergagecrestflatthantherootflattobechecked.Themajordiameterofthisgageiscontrolledinrelationto6gagingstepsinasimilarmannertotheplain6stepcrestcheckgage.Likethecrestcheckgage,theresultsmaybesomewhatmisleadingexceptthatinthecaseoftherootcheckgage,theroottruncationoftheproductthreadisalwaysmore(flatwider)thanisindicatedbythepositionofthegages.1.1.5Unlesslead,angleandtaperofproductthreadsareveiywellcontrolled,useof6stepcrestandrootcheckgageswillresultinproductthreadswithnarrowercrestflatsandwiderrootflatsthanenvisionedbythedrysealtolerances.Useofsuchagagingsystemcouldresultinrejectionofthreadswhichwouldactuallyconformtothedrysealtolerancesspecified.Theonlycompletelyreliablerefereemethodfordeterminingwhethercrestandroottruncationhasbeenheldwithintoleranceisdirectmeasurementoftheexternalthreadflatsandmeasurementoftheseflatsonacastorsectionoftheinternalthread.
【中国标准分类号】:J04
【国际标准分类号】:21_040_20
【页数】:30P.;A4
【正文语种】:英语
基本信息
| 标准名称： | 飞机电气系统飞行试验要求 |
| 中标分类： |
航空、航天 >>
航空器及其附件 >>
电气系统与设备 |
| 替代情况： | 可参见GJB 1397-1992 |
| 发布日期： | 1989-05-13 |
| 实施日期： | 1989-12-01 |
| 首发日期： | |
| 作废日期： | 1993-03-01 |
| 出版日期： | |
| 页数： | 7页 |
适用范围
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前言
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目录
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引用标准
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所属分类： 航空 航天 航空器及其附件 电气系统与设备
