Shenhai Kuputika-Uchapupu
Iyo inoputika-yechiratidzo chekumaka mune kuputika-kuvhenekesa mwenje zvigadziriso irabhu inotsanangura giredhi-risingapindire giredhi., tembiricha boka, type, uye nzvimbo dzinoshanda dzechigadziriso chemwenje.
Tsanangudzo yeKuputika-kusingabvumire Kumaka:
Sezvakaita GB 3836 mipimo, kuputika-chiratidzo chekumaka kwezvigadziriso zvemwenje zvinosanganisira:
Kuputika-uchapupu Type + Equipment Category + (Gasi Group) + Temperature Group.
1. Kuputika-uchapupu Type:
Tafura 1 Basic Types of Explosion-Proof
| Explosion proof form | Explosion proof form sign | Explosion proof form | Explosion proof form sign |
|---|---|---|---|
| Flameproof mhando | EX d | Sand filled type | EX q |
| Kuwedzera kuchengeteka mhando | EX e | Encapsulation | EX m |
| Barotropic type | EX p | N-mhando | EX n |
| Intrinsically safe type | EX ia EX i | Special type | EX s |
| Oiri invasion type | EX o | Dust explosion-proof type | EX A EX B |
2. Equipment Category:
Electrical equipment for zvinoputika gas atmospheres is divided into:
Kirasi I: For use in coal mines;
Kirasi II: For use in explosive gas atmospheres other than coal mines.
Class II explosion-proof “d” uye kuchengetedzwa kwemukati “i” electrical equipment are further divided into IIA, IIB, and IIC classes.
Electrical equipment for guruva rinopisa environments is divided into:
Type A dust-tight equipment; Type B dust-tight equipment;
Type A dust-proof equipment; Type B dust-proof equipment.
3. Tsanangudzo yeKuputika-kusingabvumire Kumaka:
The ability of an explosive gas mixture to propagate an explosion indicates its level of explosion hazard. The greater the ability to propagate an explosion, the higher the danger. This ability can be represented by the maximum experimental safe gap. Uyezve, the ease with which explosive gases, vapors, or mists can be akabatidzwa also indicates the level of explosion hazard, represented by the minimum igniting current ratio. Class II explosion-proof or intrinsic safety electrical equipment is further classified into IIA, IIB, and IIC based on their applicable maximum experimental safe gap or minimum igniting current ratio.
Tafura 2 Relationship between the Group of Explosive Gas Mixtures and the Maximum Experimental Safe Gap or Minimum Igniting Current Ratio
| Gasi boka | Maximum test kuchengetedza gap MESG (m m) | Minimum ignition current ratio MICR |
|---|---|---|
| IIA | MESG≥0.9 | MICR＞0.8 |
| IIB | 0.9＞MESG≥0.5 | 0.8≥MICR≥0.45 |
| IIC | 0.5≥MESG | 0.45＞MICR |
4. Temperature Group:
The ignition tembiricha of an explosive gas mixture is the limit temperature at which it can be ignited.
Electrical equipment is classified into T1 to T6 groups based on their highest surface temperature, ensuring that the maximum surface temperature of the equipment does not exceed the permissible value of the corresponding temperature group. The relationship between temperature groups, equipment surface temperature, and the ignition temperature of zvinobvira moto gases or vapors is shown in Table 3.
Tafura 3 Relationship between Temperature Groups, Equipment Surface Temperature, and Ignition Temperature of Flammable Gases or Vapors
| Tembiricha nhanho IEC/EN/GB 3836 | Iyo yakanyanya tembiricha yepamusoro yemidziyo T [℃] | Lgnition tembiricha yezvinhu zvinobvira [℃] |
|---|---|---|
| T1 | 450 | T＞450 |
| T2 | 300 | 450≥T＞300 |
| T3 | 200 | 300≥T＞200 |
| T4 | 135 | 200≥T＞135 |
| T5 | 100 | 135≥T＞100 |
| T6 | 85 | 100≥T＞8 |
5. Requirements for Setting Markings:
(1) Markings should be prominently placed on the main body of the electrical equipment;
(2) The markings must remain clear and durable under potential chemical corrosion. Markings such as Ex, kuputika-uchapupu mhando, category, and temperature group can be embossed or debossed on the visible parts of the casing. The material for the marking plate should be chemically resistant, such as bronze, ndarira, kana simbi isina tsvina.