ASPIRATOR-DUST SAMPLER

FIELD: machine building.SUBSTANCE: aspirator-dust sampler consists of a casing, a diaphragm pump with electric drive, a system to stabilise the volume speed of air pumping, systems to measure the volume of the pumped air, a sampling tube and a filter holder with a filter. The diaphragm pump is made as two chambers being set towards each other, rigidly interconnected and driven by an eccentric mechanism. The eccentric mechanism is installed on the electric motor axis so that the front diaphragm position of one chamber corresponds to the opposite diaphragm position of the other chamber. Suction of air into one chamber is accompanied by the discharge of air from the other chamber. Suction valves are set on the movable diaphragms, and the discharge valves - on the stationary chambers' casing. Both chambers are the walls of the air-tight pump casing connected to a suction branch pipe in which a rarefaction sensor is built-in. The two-chamber pump is placed in another external air-tight casing where air from the chambers is discharged to and one wall of which is replaced by a rubber diaphragm serving as a damper together with the inner casing space. An air mass flow metre is built-in in the other wall. The rarefaction sensor and the flow metre are connected to a motor mode control unit and to the unit for the data on air flow, volume of pumped air, weight of dust on the filter and dust concentration.EFFECT: improved accuracy of sampling and measuring the pumped air volume, keeping and measuring the constant volume speed of air pumping through the filter with dust residues, increased reliability of aspirator performance both at dust sampling and in the course of operation, simplified valve design, simplified measuring procedure for pumped air volume reduced to standard conditions.3 cl, 1 dwg Изобретение относится к области охраны труда и техники безопасности в угольной и других областях промышленности, связанных с загрязнением атмосферы (газа) твердыми частицами, и, в частности, к пылеизмерительным приборам - аспираторам воздуха. Техническим результатом является повышение точности отбора и измерения объема прокачанного воздуха, поддержания и измерения постоянной объемной скорости прокачки воздуха через фильтр с пылевым осадком, повышение надежности работы аспиратора как при отборе проб пыли, так и в процессе эксплуатации, упрощение конструкции клапанов, упрощение процесса измерения объема прокачанного воздуха, приведенного к стандартным условиям. Аспиратор-пылепр