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由部第四设计院设计,二局施工的怀化机务段挂瓦间局部机械抽风装置,已开始使用。为了解该通风设备的技术性能和卫生效果,我们于1978年8月做了一次有害物质通风控制效果的卫生鉴定,现将调查结果综述如下: 一、调查内容及方法 1.吸气罩口的流速、流量、控制风速的测定。用热电偶风速仪测定罩口风速,同一罩口各测点数据平均后用公式Q=V×A×3600求出罩口流量。由于室内水平气流影响,吸气罩下的操作台面控制风速不易测出稳定数据,故由下式计算。
Design Department by the Fourth Department of Design, Bureau of the construction of the second Huaihua mechanized section hanging between the mechanical ventilation device, has begun to use. In order to understand the technical performance and hygienic effect of the ventilation equipment, we conducted a hygienic identification of the effectiveness of ventilation control of harmful substances in August 1978. The survey results are summarized as follows: I. Investigation contents and methods 1. Inhalation Flow rate, flow rate, control wind speed determination. Measured with a thermocouple anemometer wind speed, the same hood measured the average point of the data after the formula Q = V × A × 3600 draw mouth flow. Due to the influence of indoor horizontal airflow, the control desk under the suction hood is not easy to measure the stable wind speed control data, so by the following formula.