Explosion-proof structure of electrical equipment, signs and basic requirements

Shanghai Xie Jin pump production magnetic pump, high temperature magnetic pump, stainless steel magnetic pump, pipe pumps, vertical pipe pumps, horizontal pipe pumps, pneumatic diaphragm pumps, electric diaphragm pumps and other products such as interested, welcome to consult! The basic structure of explosion-proof motor according to GB3836.1-2000 "General Requirements for Explosion-proof Electrical Equipment in Explosive Environment", the main types of explosion-proof are the following: Flameproof "d"; Increased safety "e"; Intrinsically safe "i" ; Positive pressure type "P"; non-sparking "n" and so on. Its characteristics and basic requirements are shown in the following table: Structure Type and English Name Characteristics and Basic Requirements Flameproof Type d Assemble the components capable of igniting the explosive gas mixture in a housing that withstands the explosion of the internal explosive gas mixture, and To prevent the explosion to the explosive atmosphere outside the shell of the mixture increased safety measures to take a higher degree of protection to prevent the electrical equipment inside and outside the components to prevent excessive temperature and electric arcs spark the possibility of normal operation Under the conditions of the device does not appear These phenomena Intrinsically safe i In the electrical equipment within the shell, by supplying a higher than the ambient air pressure protective gas to prevent the surrounding explosive gas mixture into the housing, the protective gas that the housing Maintain positive pressure. Protective gas can be continuously or discontinuously supplied Positive pressure type P Non-sparking electrical equipment can be used under normal conditions without risk or explosive gas mixture exists for a short period of time, explosive gas mixture and the possibility of ignition is low The acceptable level should ensure that there is sufficient reliability in the operation of a predetermined method. This type of explosion-proof is mainly used for those who require the normal operation does not produce arc, sparks or the surface is not overheating electrical equipment Explosive gas environment on the motor selection requirements Explosive gas environment The selection of electrical equipment should meet the following requirements: ① motor explosion Type (structure) shall comply with the requirements of GB 50058--1992 Explosion Hazardous Area Electrical Equipment Explosion-proof structure Zone 1 Zone 2 Explosion-proof d Positive pressure type D Increased safety Explosion-proof type d Positive pressure type P Increased safety type e Non-spark type n Cage Induction Motor Wound Induction Motor Synchronous Motor DC Motor Electromagnetic Slip Clutch (without brush) O △ 0 △ 0 0 △ 0 △ △ △ × × 0 OO 0 0 0 0 O 0 0 0 0 0 0 0 × △ Note: l. Symbol meaning in the table: O-applicable; △ - used with caution; × not applicable. 2. Wound induction motor and synchronous motor with increased safety type, the main body is an increased safety explosion-proof structure, the spark will be part of the explosion-proof or positive pressure explosion-proof structure. 3. Spark-free motors are used with caution in poorly ventilated areas and indoors with flammable substances heavier than air. ② The explosion-proof level and group of the motor should not be lower than the level and group of the explosive gas mixture in the installation site. ③ motor should meet the chemical, mechanical, thermal, mold and wind sand and other environmental conditions of the electrical equipment requirements. Electrical equipment structure should meet the electrical equipment under the specified operating conditions do not reduce the explosion-proof performance requirements. (4) Requirement for Motor Selection in Explosive Dust Environment ① The motor should meet the requirements of electrical equipment under different environmental conditions such as chemical, mechanical, thermal, mold and wind and sand in the surrounding environment. Shanghai Xie Jin pump production magnetic pump, high temperature magnetic pump, stainless steel magnetic pump, pipe pumps, vertical pipe pumps, horizontal pipe pumps, pneumatic diaphragm pumps, electric diaphragm pumps and other products such as interested, welcome to consult!

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