按结构需测试，但因0.5J的弹簧冲击器直径太大无法冲到被测物

kendy

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我公司有一款产品，发热元件是石英管，按结构需进行冲击测试，而且肯定会破、会FAIL，但因标准0.5J的弹簧冲击器直径太大无法冲到石英管，是否需要用其它能产生同等力度的仪器进行测试。

seasunsky

什么产品？
取暖器吗？
石英管外面有没有防护罩？

kendy

家用烤箱，没有防护罩。

seasunsky

见下图（引用标准为IEC 60335-2-9:2002+A1:2004）

kinzo

同问

我刚见过这么一个结构,是PTC取暖器,取暖器出风开口看进去,能看见裸导体,导体前面覆盖一个接地了的金属丝网,金属丝网非常软,但是下衬一个塑料框架保证接地丝网和裸导体之间爬电距离和电气间隙,我用30N的压力压丝网,发现还是能保证爬电距离和电气间隙的,但是我现在担心这个接地丝网通不过冲击实验?但是开口又刚好挡住了弹簧冲击器的头

kendy

关键是41号探棒能触到发热元件，但因空间太小挡住了弹簧冲击器，致使它不能冲到石英管，只能冲到它周围的结构件。

seasunsky

一般来说，PTC暖风机的出风口栅格材料都比较脆，因为该处温度比较高，§30章试验对材料的需要。如果接地金属网在出风口栅格之后，而出风口栅格可以经受冲击试验，个人认为没必要再去想着冲击接地金属网了，毕竟弹簧冲击器的头也进不去。主要还是看其爬电距离、电气间隙能否满足，以及接地金属网的接地是否良好，因为有时候企业为了防止金属网生锈，喷漆很厚，接地处未刮漆且不采用梅花垫圈，很难保证接地良好性

seasunsky

刚才发错图勒
你看注2上面那个对冲击区域尺寸的要求
4 j) f# V; ~& L1 w% e3 t1 \看其是否符合

barry

21 Mechanical strength
6 d+ O+ S/ z6 ~- l. r6 B0 v8 z21.1 Appliances shall have adequate mechanical strength and be constructed to withstand such rough handling that may be expected in normal use.
  p& Q% L+ _5 m, S) ^! UCompliance is checked by applying blows to the appliance in accordance with test Ehb of IEC 60068-2-75, the spring hammer test.
5 L+ s" ~2 @5 C1 u( xThe appliance is rigidly supported and three blows, having an impact energy of 0,5 J, are applied to every point of the enclosure that is likely to be weak.
1 g7 L3 \/ [" D1 F% |& I  [NOTE 1 Void.
If necessary, the blows are also applied to handles, levers, knobs and similar parts and to signal lamps and their covers but only if the lamps or covers protrude from the enclosure by more than 10 mm or if their surface area exceeds 4 cm2. Lamps within the appliance and their covers are only tested if they are likely to be damaged in normal use.
NOTE 2 When applying the release cone to the guard of a visibly glowing heating element, care is to be taken that the hammer head passing through the guard does not strike the heating element.
, b) B. Z' p: U+ V+ c+ I$ cAfter the test, the appliance shall show no damage that could impair compliance with this standard and compliance with 8.1, 15.1 and clause 29 shall not be impaired. In case of doubt, supplementary insulation and reinforced insulation are subjected to the electric strength test of 16.3.
" n. u7 O. [  q7 x8 m: A: xNOTE 3 Damage to the finish, small dents that do not reduce clearances or creepage distances below the values specified in clause 29, and small chips that do not adversely affect protection against access to live parts or moisture, are ignored.
NOTE 4 If a decorative cover is protected by an inner cover, fracture of the decorative cover is ignored if the inner cover itself withstands the test.
! c' D9 E5 C3 t9 X3 N# V& HIf there is doubt as to whether a defect has occurred by the application of the preceding blows, this defect is neglected and the group of three blows is applied to the same place on a new sample which shall then withstand the test.
. o- }0 ]; W$ z/ ?, x. rNOTE 5 Cracks not visible to the naked eye and surface cracks in fibre-reinforced mouldings and similar materials are ignored.

hehe, 想和大家讨论一下冲击测试。。。

kendy

现在情况是41号探棒能触到发热元件，冲击区域也大于4平方厘米，只是冲击器正好被内腔稍挡了一点，就冲不到石英管。