关于“不漏”的定义:通常人们称为不漏,总是认为绝对不允许有一点泄漏。其实绝对不漏在客观上是不存在的。对于以金属面对金属面作为密封,更是做不到。因此,GE公司工艺研究所制订了一个“不漏”的标准,即:以氦气的工质,压力为大气压,静态,泄漏量不大于10~(-8)厘米~3/秒为不漏。有的单位以10~(-4)到10~(-8) 厘米~3/秒为不漏。关于“泄漏率”:“泄漏率”是一个相对的概念,取多少为宜,尚无定论。一般对贵重的、有毒的、有腐蚀性的、易爆易燃的物品,其泄漏率当然愈少愈好。泄漏率的计量单位是单位时间内漏出的流体体积,一般每一滴大约为0.05厘米~3,即每20滴为1毫升。金属面密封的基本原理 On the “leak” of the definition: Usually people call it leak, always think that absolutely not allow a little leak. In fact, absolutely does not leak objectively does not exist. For the metal to face the metal surface as a seal, it is impossible. Therefore, GE Institute of Technology developed a “no leakage” standard, that is: the working fluid of helium, the pressure of atmospheric pressure, static, leakage of not more than 10 -8 (-8) cm 3 / second as the leak. . Some units to 10 ~ (-4) to 10 ~ (-8) cm ~ 3 / sec is not leaked. About “Leakage Rate”: “Leakage Rate” is a relative concept, whichever is more appropriate. It is inconclusive. Of course, expensive, toxic, corrosive, explosive and flammable items, of course, the less the better the leakage rate. The unit of measurement of the leakage rate is the volume of fluid that leaks out per unit of time. Generally, each droplet is about 0.05 cm-3, that is, every 20 drops is 1 ml. The basic principle of metal surface sealing