这个有意思,我公司是做低温UV机的,不过也做气压检漏仪,上次去个公司就是测试扬声器内的其他流量用的我们的设备,检测这个产品的气密性的话,应该也是可以实现的。
我自己想了个方案,愚见,盼高手补充
采用气压检漏,这个产品如果说是需要达到ipx的标准,一般百度上面查到也是用水检,的确是可以行的,但是首先水检,对产品是否有很大的损坏,上面有朋友说道装满水的箱子底部开一个喇叭外径一样的孔,膜片朝里放置堵住这个孔,水不能渗透出来为合格,那这个漏水会不会只有很微量的?很难察觉,还有漏了多少,没法知道根本没数据,而且最终也是靠人眼来判断是否有泄漏,做出口的客户如果是老外,老外是否认可人的判断?而且速度慢,检测一个产品需要多久?能满足产线要求么?操作复杂么?
采用气压检漏,就需要对产品进行气压加压,然后稳定一段时间,排除温度湿度的影响,最后测试,看是否有泄漏,漏了多少气体,时间是多少,流量是多少,都是可以有具体参数的,但是传统的气压衰减测试,市面上很多都需要有加压孔去给产品加压,那如果是防水喇叭成型后怎么检测呢?就要考虑包装气密性检测,这个一般用来测试产品包装,比如化妆品瓶子,各种医疗用的瓶子,这样的话,就需要 定制一个夹具,然后配合检漏仪对产品进行检测,这样检漏仪需要一个参数,一个能区分好品或者坏品的参数(比如单位时间内漏掉多少气体算是合格,超过这个泄漏率就判断为不合格)气体是先充到检漏仪内部,然后打到密封夹具里面,两边平衡,如果产品是坏品有泄漏,那么气压就会有很大的变化,如果没泄漏,那就没有超过预先在检漏仪里设置的参数,系统可以自动判断为合格品,仪器有红灯绿灯显示
对应扬声器这种体积很小的产品,一般如果要求不是特别高,可以做到10S每个左右,具体情况有可能更短。
气压测试Pressure decay testing measures the change in pressure between atmospheric pressure and your pressurized test sample. Unlike some other current methods of leak testing, this test method yields quantitative information, hard data points that can be recorded and upon which decisions can be made. This removes the dependency upon the operator and allows specific accept/reject criteria to be set, and this method is quite simple to use. It is fast; 2-4 second cycles are achievable, keeping in mind that test time is volume dependent. Pressure decay testing is as sensitive as the time available for the test.
流量测试Mass flow testing uses intrinsic properties of air to directly measure the amount of air escaping a closed system. While pressure decay testing is often the method of choice for leak testing, mass flow testing has several advantages, including speed of test (1-2 seconds, rather than the longer time required for the pressure decay cycle described above). In addition the mass flow test is not dependent on temperature or air density, which may be a difficulty for the pressure decay test.
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[此贴子已经被作者于2010-11-03 10:16:34编辑过]