As the name suggests, fire dampers are valves that block the passage of fumes and flames from fire zones and meet fire resistance and fire integrity requirements for a certain period of time. In the event of a fire in a building, the fire spread rapidly along the pipes of the ventilation and air-conditioning systems, and there are many cases of significant losses.
1 Overview As the name suggests, fire dampers are valves used to block the passage of fumes and flames from fire zones and to meet fire resistance and fire integrity requirements for a certain period of time. In the event of a fire in a building, the fire spread rapidly along the pipes of the ventilation and air-conditioning systems, and there are many cases of significant losses. In order to minimize the damage caused by fire, effective fire prevention and smoke prevention measures must be taken to control the spread of fire, and the reasonable setting of fire dampers in ventilation, air conditioning and smoke control systems plays an important role. effect. However, in many design projects, the selection of fire dampers is wrong, and the setting of the position is unreasonable.
2 Structure and working principle of fire damper The structure of fire damper is shown in Figure 1. It consists mainly of valve body and actuator. The valve body is composed of a casing, a flange, a blade and a blade linkage mechanism. The actuator is composed of a casing, a blade adjusting mechanism, a clutch, a temperature fuse, and the like. The actuator of the fire damper controls the rotation of the blade through a metal fusible sheet and a clutch mechanism.
When the temperature of the gas conveyed in the pipe reaches the melting temperature of the fusible metal piece, the fusible piece is blown, and the compression spring and the spring pin on the mandrel quickly lay down the clutch pad, and at this time, the clutch and the blade adjusting mechanism are disengaged. Since the valve body is provided with two torsion springs, the blades are subjected to a torque to rotate. It can be seen that the actuator of the fire damper adopts the mechanical transmission principle and does not require electricity, gas and other energy sources, so that it can ensure the fire prevention effect under any circumstances. The opening and closing of the fire damper is in accordance with the requirements of the system. The system is in the open state when the system is deactivated and in normal operation. If the temperature of the conveying gas in the pipe is lower than the melting point of the selected metal fusible piece, it is in normal operation and the valve is open. of. Only when the operating conditions exceed the normal use state, the valve will automatically close to achieve the role of security.
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Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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