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防爆等级,防爆原理

行业标准


防爆基本知识之防爆原理

防爆基本知识防爆原理:介绍防爆标准的基本常识,原理如:
1、隔爆型代号“d”,与增安型“e”,本质安全型“i”,正压型“p”,油浸型“o”,充砂型“q”等区别;
2、增安型代号“e”,与隔爆型“d”,本质安本型“i”,正压型“p”,油浸型“o”,充砂型“q”等区别;
3、本质安全型代号“i”,与与隔爆型“d”,与增安型“e”,正压型“p”,油浸型“o”,充砂型“q”等区别;

防爆标准
Standard
 
防爆原理
Principle of explosion-proof
图解
IIIustration
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面不致损失,并能防止爆炸传播到外壳外。
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.

 

 

隔爆型
 
增安型 e
Increased safely 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.

 

 

增安型
 
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。
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.

 

 

正压型
 
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 established test
conditions (including the normal operating and certain faule conditions), which could lead to
the ignition of a given explosive atmosphere.

 

 

本质安全型
 
充油型 O
Oil immersion O
IEC 60 079-5
EN 50 017

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个壳处面的爆炸性气体。
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.

 

 

充油型
 
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 ignigion
source are fixed in position and completely surrounded by finely ground solids, so
as to prevent ignition of an external explosive atmosphere.

 

 

充砂型
 
浇封型 m
Moulding m
IEC 60 079-18
EN 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 a casting compound
so that the explosive atmosphere cannot be ignited.

 

浇封型
 
无火花型 n
Protection method n
IEC 60 079-15
EN 50 021
电气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 Zone 2
n 型的几种保护方法
Several protection
methods are subsumed
under the protection type

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