In brief, fire damper is a kind of equipment to prevent the extension of fire. In general buildings, it is usually installed at the entrance of the fan used for both smoke exhaust system and ventilation and air conditioning system. The fire damper is usually in a normally open state. When a fire occurs, the air flow temperature in the pipeline rises to the fuse and the fuse is easy to fuse. When the temperature occurs, the fusible sheet is fused and the core rod is pushed by the spring to disengage the fork plate, the valve shaft rolls and closes the valve under the action of the torsion spring. Normally, if the air volume needs to be dispatched, the valve opening can be dispatched through the handle linked with the valve shaft. When the requirement is reached, the position is fixed by the butterfly nut. The contact between the fork plate and the handle is provided with ring teeth to prevent sliding after meshing, so as to keep the valve opening unchanged after adjustment. According to the user's requirements, an additional closed electrical signal output device can be used as a fire control valve.
3c fire damper: the equipment is usually open on the air supply and return pipelines of ventilation and air conditioning systems. when the temperature of the gas in the pipeline reaches 70 ℃, it is closed when the fire damper reaches 70 ℃. it can meet the requirements of fire stability and fire resistance within a certain period of time, and has the effect of smoke isolation and fire prevention.
Smoke fire damper: the equipment is on the smoke exhaust pipe road, usually open, closed when the gas temperature in the pipe reaches 280 ℃, and can satisfy the requirements of fire stability and fire resistance within a certain period of time, and the valve with smoke isolation and fire retardant effect.

3C fire valve principle.
In the air duct system of central air conditioning, the working principle of the equipment is to control the temperature of fusible alloy, and use the effect of gravity effect and tension spring organization to close the valve. When a fire breaks out, the flame violates the air duct, and the high temperature melts the fusible alloy on the valve, or the valve is actively closed due to the deformation of the recall alloy, which is used in occasions where the air duct and the fire zone run through.
3C smoke exhaust fire damper product is mainly a smoke exhaust fire damper product used in conjunction with the smoke exhaust fan. Generally, it is installed at the end of the smoke pipe of the fire exhaust valve and the junction between the smoke exhaust fan and the smoke exhaust pipe. When using 3C smoke exhaust fire damper, it should be noted that the smoke exhaust valve and the smoke exhaust fire damper are completely different in function. The smoke exhaust fire damper is normally open and open in case of fire. However, when the smoke temperature reaches 280 ℃, the fan that has been linked to the open has stopped running. Considering the high temperature operation in the kitchen, the fire dampers of other fan pipelines advocate the installation of 150 ℃ fire dampers.
In the air duct system of the central air conditioner, the operating principle is to use the temperature control of the extremely fusible alloy installed on the valve, and to use the gravity effect and the spring organization effect. When a fire occurs, the flame invades the air duct, and the high temperature melts the fusible alloy on the valve, or the memory alloy deforms to actively close the valve, which is used in occasions where the air duct and the fire prevention partition run through.
Safe 3C fire damper products and equipment are in great demand now. Fire dampers are also necessary acquisition equipment under construction, which also reflects the intention of today's shopping malls. Fire 3C certified fire dampers are very popular today. Among them, the application of remote control smoke exhaust fire dampers is more and more well known and is also regarded as a treasure by many industries. We all know that if fire dampers are used as ventilation and air conditioning systems when smoke exhaust systems are used as well, the demand takes into account the air regulation requirements during ventilation, as well as the requirements for agile smoke exhaust and fire prevention in case of fire. Fire dampers are also suitable for occasions where ventilation and air conditioning pipes are installed on suspended ceilings and cannot be manually reset.
The bearing temperature rise is too high: the bearing support seat oscillates sharply, the lubricating grease is of poor quality, disintegration, containing impurities such as dust, sand, dust and dirt, the tightening force of the connecting bolt of the bearing seat is too large or too small, the bearing runs short of oil, the shaft and the bearing device are inclined, the front and rear two-shaft bearings are not concentric, the bearing is damaged or the bearing life has reached, the fan shaft is balanced with the motor shaft, and the belt groove is misaligned.
Shandong Xingheng Environmental Technology Group Co., Ltd. is located in Luquantun Development Zone, Dezhou, Shandong Province, the hometown of glass fiber reinforced plastic in China. The company has three-level qualification for construction mechanical and electrical installation engineering, three-level qualification for environmental protection engineering, and safety production license. It is the first in the industry to pass ISO9001 quality management system certification, ISO14001 environmental management system certification, OHSAS18001 occupational health management system certification, an axial fan invention patent, a fan utility model patent, EIA, three at the same time waiting for complete procedures