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一、基本情况为避免离心式通风机的启动电流过大,我国的一些技术资料和教材中,都要求离心式通风机装设启动阀。已设计的通风工程也都在离心式通风机的进、出口装有启动阀,目的是在启动风机前先将启动阀关闭,使风机在空载情况下启动,以减少启动电流,保证电动机的安全。这项技术措施普遍应用于国防、民用、矿山和其它各行各业的通风、空调工程。但对全国一些地区的厂矿调查中发现,多数通风系统按设计要求装设的启动阀多没使用。如某钢厂轧钢车间加热炉鼓风机采用9-27-12 12~#高压风机一台,配用JS116-4型155kW电动机,无降压启动设施,启动时不关闭启动阀,运转正常;又如某锰矿烧结厂一台4-72-11 16~#风机,配用75kW电动机,未
First, the basic situation In order to avoid the centrifugal fan starting current is too large, some of our technical information and teaching materials, require the installation of centrifugal fan start valve. Ventilation projects have also been designed in the centrifugal fan inlet and outlet with a start valve, the purpose is to start the fan before the start valve is closed, the fan starts in the case of no load to reduce the starting current to ensure that the motor Safety. The technical measures are widely used in national defense, civil, mining and other industries in ventilation and air conditioning projects. However, surveys of factories and mines in some parts of the country found that most of the start-up valves installed by the ventilation system according to the design requirements were not used much. If a steel rolling mill furnace blower using 9-27-12 12 ~ # a high-pressure blower with JS116-4 155kW motor, no step-down start-up facilities, start the valve does not close the start, the normal operation; another example A manganese ore sintering plant 4-72-11 16 ~ # fan, equipped with 75kW motor, not