Commonly used respiratory protective equipment is divided into two types: filter type (purification type) and isolated type (air supply type)
the filter respirator can only be used in the environment without oxygen deficiency (i.e. the oxygen content in the ambient air is not less than 18%) and the environment with low concentration of toxic pollution. Generally, it can not be used for the protection of workers in closed narrow containers such as tanks and tanks
filter respirator is divided into filter dust respirator and filter gas respirator. The former is mainly used to prevent particle size less than 5 μ The respirable dust is harmful when inhaled through respiratory tract, which is usually called dust mask and dust mask; The latter is used to prevent the inhalation of toxic gases, vapors and smoke through the respiratory tract. 1t is usually called gas mask and gas mask, which can be divided into self-priming and air supply type. At present, the self-priming gas respirator is mainly used
the isolated respirator can isolate the user’s respiratory organs from the polluted environment, and supply air or oxygen from the respirator itself, or introduce air from the clean environment to maintain the normal breathing of the human body. 1t can be used in anoxic, seriously polluted and unidentified workplaces with life-threatening conditions, and is generally not limited by environmental conditions. According to the form of gas supply, it can be divided into gas supply type and gas carrying type. The portable respirator has its own gas source, which belongs to the portable type. According to the different gas sources, it can be divided into oxygen respirator, air respirator and chemical oxygen respirator; Air supply type is only suitable for fixed post operation and operation with small flow range
when choosing respiratory protective equipment, we should consider the nature of hazardous chemicals, the maximum concentration of pollutants in the workplace, the oxygen content in the workplace, the user’s face and environmental conditions
respirators can be divided into the following categories according to their functions:
filter type respiratory protective equipment: respiratory protective equipment that can remove harmful substances from the inhaled working environment air through the adsorption, absorption, catalysis or filtration of purification components
self priming filtering respiratory protective equipment: it is a kind of filtering respiratory protective equipment that can overcome the resistance of components by breathing of the wearer
supply air filter respiratory protective equipment: filter respiratory protective equipment which can overcome the resistance of components by power (such as electric fan or manual fan)
close fitting face mask: a face mask that can cover the nose and mouth, or a face mask that can cover the eyes, nose and mouth. Close fitting face mask is divided into half face mask and full face mask
isolated respiratory protective equipment: it can isolate the wearer’s respiratory organs from the working environment, and lead them into the clean air source outside the working environment by their own air source or airway
air supply respiratory protective equipment: it is an isolated respiratory protective equipment that the wearer uses breathing or mechanical force to introduce clean air through the airway
air carrying respiratory protective equipment: the wearer carries air bottle, oxygen bottle or oxygen generator as the air source of isolated respiratory protective equipment
negative pressure respiratory protective equipment: a kind of respiratory protective equipment, in which the pressure in the mask is less than the ambient pressure in any breathing cycle
positive pressure respiratory protective equipment: a kind of respiratory protective equipment, the pressure in the mask is greater than the ambient pressure during any breathing cycle
open face mask: it is used as the air delivery device of positive pressure respiratory protective equipment, covering only eyes, nose and mouth, and closely fitting with the face
aspirating headgear: it is applied to the aspirating and guiding device of positive pressure respiratory protective equipment, which can completely cover the head, eyes, nose, mouth and neck, and can also cover part of the shoulder or be used with protective clothing
escape type respiratory protective equipment: it is only used to escape from harmful environment in emergency
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