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防爆原理
发布时间:2010/6/22

防爆原理 Principle of explosion-proof


基 本 原 理

基 本 原 理

显 示 图

隔爆型“d”
Flame-proof
“d”
IEC 60 079-1
EN 50 018

将设备在正常运行时,能产生火花电弧的部件置于隔爆外壳体,隔爆外壳能承受内部的爆炸压力而不致损失,并能防止传播到外壳外。
Parts which can ignite an explosive atmosphere are placed in an enclosure which, if there is an ignition of an explosive mixture internally, will withstand the pressure and prevent the explosion being transmitted to the atmosphere around the enclosure.

增安型“e”
Increased safety
“e”
IEC 60 079-7
EN 50 019

在正常运行时不会产生电弧、火花和危险高温,在结构上再进一步采取保护措施,提高设备的安全性 Additional measures are taken to achieve a higher level of safety and avoid the risk of impermissibly high temperatures and the occurrence of sparks and arcs internally or on external parts of electrical equipment, which in normal use produce neither sparks, arcs nor dangerous temperatures.

正压型“P”
Pressurised apparatus
“P”
IEC 60 079-3
EN 50 016

保持内部保护气体的压力高于周围,以免爆炸性混合物进入外壳,或使足量的保护气体通过外壳,使内部的爆炸性混合物的浓度降至爆炸下限以下。保持内部保护气体的压力高于周围,以免爆炸性混合物进入外壳,或使足量的保护气体通过外壳,使内部的爆炸性混合物的浓度降至爆炸下限以下。
The formation of an explosive atmosphere inside an enclosure is prevented by using a protective gas to maintain an internal over pressure relative to the surrounding atmosphere, and if necessary, the interior of the enclosure is permanently supplied with protective gas so that there is dilution of flammable mixtures.

本质安全型“i”Intrinsic safety“i”
IEC 60 079-11 EN 50 020。

设备内部的电路在规定的条件下,正常工作或规定的故障状态下产生的电火花和热效应均不能点燃爆炸性混合物。
The equipment placed in the hazardous area contains only intrinsically safe circuits.A circuit is intrinsically safe if no sparks of thermal effects occur under establishedtest conditions ( including the normal operating and certain fault conditions ), which could lead to the ignition of a given explosive atmosphere.

充油型“O”
Oil immersion“O”
IEC 60 079-6
EN 50 015

将电气设备的部件整个浸在保护液中,使设备不能够点燃液面上或外壳外面的爆炸性气体。
Electrical equipment or parts of electrical equipment are immersed in a protective liquid in such a way that an explosive atmosphere above the surface of outside the enclosure cannot be? ignited.

充砂型“q”
Powder filling“q”
IEC 60 079-5
EN 50 017

电气设备的一种防爆型式,将能点燃爆炸性气体的被固定导电部件完全埋入填充材料中,以防止点燃外部爆炸性气体环境。
Type of protection by which the equipment parts that could become an ignition source are fixed in position and completely surrounded by finely ground solids, so
as to prevent ignition of an external explosive atmosphere.

浇封型“m”
Moulding
“m” IEC 60 079-18EN 50 028

将可能点燃爆炸性混合物的部分浇封在复合物中,使它不能点燃周围的爆炸性气体。
Parts which can ignite an explosive atmosphere are embedded in casting compound so that the explosive atmosphere cannot be ignited.

无火花型“n”
Protection method“n”
IEC60 079-15
EN 50 021

电器设备不能点燃周围的爆炸性气体(在正常的工作条件下和在确定的非正常工作条件下)。
Electrical equipment is not capable of igniting a surrounding explosive atmosphere( in normal operation and under defined abnormal operating conditions ).

2区
n型的几种保护方法Zone 2 Several protection methods of type n are subsumed
under the protection type.


国际防护等级标准 International protection code

防外物进入外壳等级Prevent solid class 

试 验 Test

防护 Protection

0

不做试验
Exempt from testing

本身固有的保护
Inherent protection

1

能防止直径大于50mm的
固体类物进入体内
(如:手的意外接触) Protected against solid bodies larger than50mm(eg:accidental contact with the hand)

2

能防止直径大于12.5mm的固体类物进入体内(如:手指)
Protected against solid bodies
larger than 12.5mm(eg:finger)

3

能防止直径大于2.5mm的固体类物进入体内(如:工具,导线)
Protected against solid bodies larger than 2.5mm
(eg:tools,wires)

4

能防止直径大于1mm的固体类物进入体内(如:小工具,导线)
Protected against solid bodies
larger than 1mm
(eg:fine tools, small wires)

5

防尘,尘埃的进入量不能达到防护设备正常运转的程度
Can not completely protected
against dust,but dust entried
will not effect the normal
running of electrical equipment

6

无尘埃进入
Completely protected
against dust

防水进入外壳等级 Water-proof class
 

试验 Test

防护 Protection

0

不做试验
Exempt from testing

本身固有的保护
Inherent protection

1

滴水(垂直滴水)无害影响
Protected against vertically
-falling drops of water(condensation)

2

当外壳从正常位置倾斜在15°以内时,垂直滴水无有害影响Protected against drops of water
falling at up to 15°from the vertical

3

垂直成60°范围以内的淋水 无有害影响Protected against drops of rainwater at? up to 60°from the vertical

4

任何方向溅水无有害影响Protected against projections of water from all directions

5

任何方向喷水无有害影响Protected against jets of water
from all directions

6

猛烈海浪或强烈喷水时,无有害影响Completely protected against jets of water of similar force to heavy waves

7

防浸水影响Protected against the effects of immersion

8

防潜水影响Protected against the effects of prolonged immersion under specified conditions

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