【正文】 DongFeng Behr Thermal Systems Co., Ltd. LeakTesting密封性檢測技術The copying, distribution and utilization of this document as well as the munication of its contents to others without expressed authorization is prohibited.Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or ornamental design registration.為什么要進行泄漏測試 ?安全客戶滿意度增加利潤The copying, distribution and utilization of this document as well as the munication of its contents to others without expressed authorization is prohibited.Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or ornamental design registration.什么是泄漏測試v泄漏測試是生產(chǎn)工藝必需的要求。v泄漏測試是為了保證零部件或零部件的某個部位或零部件裝配后無泄漏。v進行泄漏測試的兩個重要原因是：保障安全和質(zhì)量。v質(zhì)量 :保障產(chǎn)品質(zhì)量，防止故障，減少生產(chǎn)差錯導致的高成本和客戶的不滿。v安全 :保證產(chǎn)品滿足關于泄漏的工藝要求。如燃油系統(tǒng)和剎車系統(tǒng)。The copying, distribution and utilization of this document as well as the munication of its contents to others without expressed authorization is prohibited.Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or ornamental design registration.典型的汽車零部件The copying, distribution and utilization of this document as well as the munication of its contents to others without expressed authorization is prohibited.Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or ornamental design registration.如何進行密封測試v最簡單的方法之一就是把零部件投入水中，加壓，觀察氣泡。v這個方法的問題是我們無法知道被測零件的泄漏量。v最先進的泄漏測試方法就是應用電子測漏儀器。v一些最常用的測試方法是：壓降法（直壓法）壓差法大流量法The copying, distribution and utilization of this document as well as the munication of its contents to others without expressed authorization is prohibited.Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or ornamental design registration.v這些方法對密封性測試都很有效。v沒有一種方法對所有的應用而言是最好的。v他們都有各自優(yōu)點和缺點，應用那種方法合適取決于被測零件、工藝要求和技術要求。v你需要和一個能夠全面應用這些技術的公司合作。v泄漏測試系統(tǒng)應根據(jù)具體應用設計，要考慮：測試容積、泄漏率、測試壓力、測試節(jié)拍、以及工藝上為何要求要進行密封性測試。The copying, distribution and utilization of this document as well as the munication of its contents to others without expressed authorization is prohibited.Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or ornamental design registration.為何要密封測試252。 鑄件孔洞252。 零件有裂紋或缺陷252。 裝配是否恰當（空調(diào)裝配）252。 裝配的完整性（散熱器、中冷器、油冷器）252。密封件缺失252。密封件損壞252。 管件或蓋子缺失252。 內(nèi)漏 ,腔體間互漏252。 總裝糾錯The copying, distribution and utilization of this document as well as the munication of its contents to others without expressed authorization is prohibited.Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or ornamental design registration.空氣和液體試漏的對比v很多汽車零部件都是依靠液體來運行，問題是我們?yōu)槭裁床灰砸后w為介質(zhì)進行密封性測試呢？v我們可以對比一下一空氣和液體作為介質(zhì)進行密封性檢測的優(yōu)缺點。空氣有可壓縮性，且黏度相對較低。這意味著空氣通過漏點的速度比液體的要快 100400倍。v空氣本質(zhì)上沒有表面張力。這個特點使它比液體更容易通過小的漏點。v然而 ,也必須考慮到空氣可以通過的泄漏，對液體而言可能并不一定會泄漏。這就是為什么以空氣作為介質(zhì)進行試漏的時候要定義一個最大允許空氣泄漏量。v以空氣為介質(zhì)進行試漏的最大優(yōu)點就是速度快。The copying, distribution and utilization of this document as well as the munication of its contents to others without expressed authorization is prohibited.Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or ornamental design registration.空氣 液體The copying, distribution and utilization of this document as well as the munication of its contents to others without expressed authorization is prohibited.Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or ornamental design registration.關于無泄漏技術要求v有時設計工程師很容易會講： “零件應該無泄漏 ” 然而 ,這就像要求沒有尺寸公差一樣，沒有一點偏差！v例如 :10mm+0=…………v世界上 “無泄漏 ”的概念是不存在的。所有的東西都有泄漏v每個零件都有一定數(shù)量的空氣泄漏點。當我們說零件無液體泄漏時，我們就可以據(jù)此定義一個空氣泄漏率。v然而， 因為我們以空氣為介質(zhì)測試大部分的零配件，以保證無液體泄漏，因此不能定義這些零件不漏空氣或其他氣體。v最大泄漏值通常表示為在一定測試壓力下泄漏率為多少 cc/min。The copying, distribution and utilization of this document as well as the munication of its contents to others without expressed authorization is prohibited.Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or ornamental design registration.什么是泄漏v當我們試圖回答什么是泄漏的時候，我門需要知道零件的材質(zhì)是什么。是鋁的、鑄鐵的還是塑料的。v通常我們會認為泄漏是由零件上僅有的一個圓洞引起的。但這不是事實。v如果我們觀察泄漏的截面，我們會看到泄漏是有很多漏點造成的。v有時是由零件或鑄件上的裂紋造成的。但大多數(shù)情況下是細小的砂眼造成的。The copying, distribution and utilization of this document as well as the munication of its contents to others without expressed authorization is prohibited.Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or ornamental design registration.v假設我們做個泄漏測試，測漏儀顯示的結(jié)果是 10CC/Min.v泄漏有可能來自一個 10CC/Min漏孔 或者兩個 5CC/Min的漏空，或者 10個 1CC/Min的漏空。The copying, distribution and utilization of this document as well as the munication of its contents to others without expressed authorization is prohibited.Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a patent, utility model or ornamental design registration.v假設我們考慮泄漏率為 10CC/Min@1Bar(15PSI)的漏空 ,對有些人來講這是一個大漏 ,(對某些零件而言也是 ),我們假定泄漏來自一個漏孔。v假設零件的厚度或漏孔的長度是 1MM.v一公斤壓力下 10CC/Min的漏孔就是 25微米大小 .v一公斤壓力下 5CC/Min的漏孔就是 17微米 大小 .The copying, distribution and utilization of this document as well as the munication of its contents to others without expressed authorization is prohibited.Offenders will be held liable for the payment of damages. A