专注通风管道加工·排烟罩

　　1. There are many ways to classify the ventilation system. According to different ways of classifying, there are different titles.

　　（1）按通风体系的动力来分

　　(1) According to the power of ventilation system

　　通风方法按照空气活动动力的不同，2能够分为天然通风和机械通风两大类。

　　Ventilation methods can be divided into natural ventilation and mechanical ventilation according to the different dynamic forces of air activity.

　　1) 天然通风

　　1) natural ventilation

　　天然通风原理如图2-1所示。天然通风是依托室表里温差所构成的热压，或者室外风力的效果在建筑物上构成的压差，使室内的空气进行交流，从而改善室内空气环境。

　　The principle of natural ventilation is shown in Fig. 2-1. Natural ventilation relies on the thermal pressure formed by the temperature difference between the surface and the inside of the room, or the pressure difference formed by the outdoor wind effect on the building, so that the indoor air can be exchanged and the indoor air environment can be improved.

　　2) 机械通风

　　2) mechanical ventilation

　　使用通风机所发生的动力，使室表里空气进行交流的通风方法为机械通风。其长处是：通风量、风压不受室外气象条件的约束，通风比较稳定，对空气处理比较方便，通风调理比较灵敏。

　　Mechanical ventilation is the ventilation method that uses the power generated by the ventilator to make the air in the room surface communicate. Its advantages are: ventilation volume and pressure are not constrained by outdoor meteorological conditions, ventilation is relatively stable, air treatment is more convenient, ventilation conditioning is more sensitive.

　　2. 按通风体系的效果规模划分

　　2. Classification of ventilation system according to its effect scale

　　按通风体系的效果的巨细，通风方法可分为部分通风和通风。

　　According to the effect of the ventilation system, the ventilation method can be divided into partial ventilation and comprehensive ventilation.

　　1) 部分通风

　　1) partial ventilation

　　使用部分的送、排风操控室内部分地区的污染物的传达或操控部分地区的污染物的传达或操控部分地区的污染物浓度达到卫生标准要求的通风叫做部分通风。部分通风又分为部分排风和部分送风。

　　It is called partial ventilation that uses partial air supply and exhaust to control the transmission of pollutants in some areas of the room or to control the transmission of pollutants in some areas or to control the ventilation whose pollutant concentration meets the requirements of sanitary standards in some areas. Partial ventilation is divided into partial exhaust and partial supply.

　　①部分排风

　　Part of exhaust air

　　部分排风是在集中所发生有害物的部分地址，设置有害物捕集设备，将有害物质就地排走，以操控有害物质向室内分散。部分排风体系如图2-2所示。

　　Part of the exhaust air is located at some sites where harmful substances are concentrated. The equipment for collecting harmful substances is set up to remove harmful substances in situ so as to control the dispersion of harmful substances into the room. Part of the exhaust system is shown in Fig. 2-2.

　　②部分送风

　　Partial air supply

　　部分送风方法是使用通风机和风管，直接将室外新鲜空气或者通过处理后具有一定参数的空气送到作业地址。炼钢、锈造等高温车间常常选用这种通风方法。

　　Part of the air supply method is to use ventilators and ducts to directly send outdoor fresh air or air with certain parameters after treatment to the work address. This ventilation method is often used in high temperature workshops such as steelmaking and rusting.

　　2） 通风

　　2) comprehensive ventilation

　　通风是对整个房间进行通风换气。通风包括排风，送风和送、排风。

　　Full ventilation is to ventilate the whole room. All-round ventilation includes all-round ventilation, all-round air supply and all-round air supply and exhaust.

　　①排风

　　Full ventilation

　　排风是从整个房间扫除有害物质的通风方法，为了使室内发生的有害物尽可能不分散到其它区域或领室去，能够在有害物比较集中发生的区域或房间选用机械排风。图2-4位机械排风体系，图2-4（a）是在墙上装有轴流风机的简略排风体系。

　　Full ventilation is a ventilation method to remove harmful substances from the whole room. In order to prevent harmful substances from dispersing to other areas or Consulates as far as possible, mechanical ventilation can be used in areas or rooms where harmful substances are concentrated. Figure 2-4 is the simplest comprehensive mechanical exhaust system with an axial-flow fan installed on the wall.

　　②送风

　　Full air supply

　　把符合卫生要求的空气送到整个房间各个部位的送风体系称为送风。能够通过天然通风和机械通风来完成。机械送风体系如图2-5所示，通过处理后的空气，在风机的效果下，经风管、送风口送入整个房间的各个部位，而排风可通过排风口或门窗排出。

　　The air supply system that delivers the air that meets the hygienic requirements to all parts of the room is called comprehensive air supply. It can be accomplished by natural ventilation and mechanical ventilation. The comprehensive mechanical air supply system is shown in Figure 2-5. Under the effect of the fan, the treated air is fed into all parts of the room through air ducts and air outlets, and the exhaust air can be discharged through air outlets or doors and windows.

　　③送、排风

　　(3) Full air supply and exhaust

　　在门窗紧闭，天然排风或进风比较困难的房间，常选用图2-4所示排风和图2-5所示的送风相结合的送、排风体系。

　　In rooms where doors and windows are closed and natural ventilation or intake is difficult, a comprehensive air supply and exhaust system combined with comprehensive air supply shown in Figure 2-4 and Figure 2-5 is often used.