There is a lot of confusion about the ranking of IPxx ratings. The truth is there is no such ranking at all...

1. IPXX
防护等级
IS IPX7 A STRICTER IPX6?
IPX7是不是更严格的IPX6？

2. IPXX
防护等级
©HENNING RICHTER 2018
There is a lot of
confusion about
the ranking of
IPxx ratings. The
truth is there is
no real ranking
at all, since each
group forms a
class of its own.
IP的排名造成很
多混乱。实际
上系统不存在
任何排名。每
个IP的类目都是
独立的。

3. IPXX dynamicpressureeffect
防护等级 动压力影响
a) The dynamic pressure
equivalent of an unseparated
water jet’s impact force of
both IPx5 (0.3bar nozzle
pressure) and IPx6 (1bar
nozzle pressure) is greater
than the maximum absolute
pressure under IPx7
conditions (0.1bar at 1m
depth).
a）IPx5和IPx6的动压力
比IPx7的最大绝对压力大。
©HENNING RICHTER 2018

4. IPXX coverstrippingeffect
防护等级 盖拆开的影响
b) The IPx7-8 immersion results in force vectors
that are perpendicular to every surface
segment while the above mentioned dynamic
nature of an IPx5-6 water surge causes a
predominant direction of the water particle’s
force vectors. So the impact of a water jet may
pull a cover open (e.g. a connector cap) that
would otherwise stay in place during
submersion.
b）IPx7-8的淹没造成在到处竖直的力矢量。
IPx5-6的洪流有主方向的力矢量。所以喷射
的冲击可能拆开盖子。IPx7-8的时候,同一盖
子待在原地。
©HENNING RICHTER 2018

5. IPXX deformationeffect
防护等级 变形的影响
c) Projecting geometry
portions, for example
mounting ears are subjected
to force from the surge’s
impact, causing elastic
deformation that may affect
an adjacent seal’s
performance.
c）受到喷射冲击力的凸出
部分造成弹性变形，这样
影响相邻密封片的功能。
©HENNING RICHTER 2018

6. IPXX obstructedventeffect
防护等级 阻塞透气阀的影响
d) In the process of chilling, a vent
that is submerged under IPx1-IPx4
conditions will cause a vacuum in
the housing that can draw air and
water through the gaskets. This
way, a specimen that does pass
IPx5-IPx6 may actually fail the
“lower” drip and spray tests.
d）进行冷却过程时， 淹没的透
气阀造成壳体里面的真空,以此
穿密封片的气流和水流。这样
来说，一个通过IPx5-IPx6测试的
样本可以在IPx1-IPx4的实测不及
格。
©HENNING RICHTER 2018