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一、前言我们对ＪＢＴ－５２型和ＪＢＴ－６２型防爆轴流式通风机进行了两次技术测定，结果发现，ＪＢＴ系列风机的实际特性曲线与出厂特性曲线比较，差距很大，风量有所减少，风压降低较多，而噪声却大大超过规定标准，高达１０８ｄＢ（Ａ）。针对这种状况，经过认真调查研究?
I. Preface We conducted two technical tests on JBT-52 and JBT-62 explosion-proof axial flow fan and found that the actual characteristic curve and the factory characteristic curve of JBT series fan are quite different, Reduce the wind pressure to reduce more, but the noise is much higher than the required standard, up to 108dB (A). In view of this situation, after careful investigation?