Turbine Centrifugal Fan
Features: Turbine centrifugal fan impeller adopts the international standard backward design, the perfect streamline structure, large openings into the center of the impeller inlet wind, the wind through the center port into the wind, resulting in a strong centrifugal force, by the backward tilt fan blades thrown off quickly Turbine structure design makes the wind turbine has a strong wind, wind pressure.
Highlights: Turbine centrifugal fan by the overload thermal motor protection of the outer rotor, high efficiency after the circular arc-shaped centrifugal impeller of two parts. All impeller mold production, high precision dynamic balancing machine calibration, with small size, high efficiency, air volume, small vibration, low noise, superior performance, easy installation and commissioning.
Application: Material: Made of PA6 plastic, plastic one molding process. Diameter size 155mm ~ 250mm.
Applications: Air purification equipment, factory equipment (printing equipment, chemical fiber equipment, etc.), medical equipment, fresh food cabinets, refrigeration cabinets, servo motors, inverters, pipe ventilation, dehumidifiers, etc.
Volute centrifugal fan:
Features: Volute centrifugal fan impeller driven by the motor rotation, the impeller blades forcing gas rotation, the gas to work, to increase its energy, the centrifugal force in the gas around the impeller thrown through the scroll casing will speed Can be converted into pressure energy, when the impeller gas is discharged, the impeller pressure is lower than the pressure inside the inlet, the new gas in the pressure difference under the action of inhalation impeller, the gas is continuously exported from the outlet.
Highlights: The fan is designed with a reasonable impeller angle according to the aerodynamics of air flow. Without any mechanical friction during operation, a reasonable blade shape line minimizes the noise. The optimized impeller minimizes the axial force and has an efficient impeller , And the static and dynamic balance correction, the machine running smoothly, without any damping device, the bearing amplitude is relatively small.
Application: Material: Aluminum die-casting frame, wind wheel made of galvanized sheet, surface black electrophoresis, size Diameter: 120mm ~ 160mm
Applications: Sterilizers, heat exchange systems, clean benches, air shower, laboratory equipment, etc.
choose the suitable fan
1, the first parameter to note are: air volume, total pressure, efficiency, sound pressure level, speed and motor power.
2, Centrifugal fan pressure can be divided into three categories: high pressure centrifugal fan P> 3000Pa, medium pressure centrifugal fan 1000≤P≤3000Pa and low pressure centrifugal fan P <1000Pa. Depending on the stupid physicality and chemical properties of the delivered gas and the use, etc., different types of centrifugal fans are selected.
3, taking into account the loss of air leakage pipeline system, calculation error, as well as the actual fan fan, wind pressure negative deviation, centrifugal fan selection, the general use of air flow rate of 1,05 ~ 1,1, wind pressure of 1,10 ~ 1,15 safety factor. In order to prevent long-term fan in low-efficiency operation, it is not appropriate to use excessive safety factor.
4, in order to make the fan stable operation, should make the fan work in the vicinity of its efficiency, the fan operating point is located in the performance curve of the full pressure peak point on the right (ie, gales side, and is generally located at full pressure peak 80%). Fan design efficiency of the selected conditions, not less than 90% of the fan efficiency.
5, the use of variable frequency fan, the total pressure loss should be calculated as the system rated pressure, but the fan motor power should be calculated on the additional 15% to 20%.
Turbo-Blower,Electric Turbo-Blower,Professional Turbo-Blower,Turbo Fan Shenzhen Fu Sheng Electric Co., LTD. , http://www.fushengfan.com
The search and rescue team of the British Fire Department repeatedly participated in international rescue missions and summed up some experiences and lessons in earthquake rescue .
1. Correctly understand survivors' survival time
Some people believe that people buried under pressure after 2 days of major earthquakes still hope to survive. Six or seven days later, survivors can be found to be "miraculous." However, professional search and rescue personnel do not think so. In their eyes, buildings damaged or even collapsed are filled with honeycomb-like spaces. Due to various factors, many disaster victims can tenaciously persist for many days. There are countless examples. For example, in 1985, only about one infant was rescued a week after the earthquake in Mexico, and even a 9-year-old boy was rescued 15 days after the earthquake. Therefore, as long as there is still little hope, search and rescue work should not be suspended.
2, as many as possible to send professional search and rescue personnel and emergency training of non-professionals
In many cases, non-professional rescue personnel lacked the know-how of survivors in the collapsed buildings, resulting in the loss of optimal rescue time for some victims. In addition, there are many known and unknown risk factors in the ruins of buildings. The lack of awareness of these risk factors by non-professional rescue workers can easily lead to further collapse of buildings. Professional search and rescue personnel have the right search and rescue knowledge and skills, have professional search and rescue tools and rich experience in search and rescue, can minimize the risk, and increase the survival rate of the affected people. Therefore, as many as possible experienced professionals should be involved in search and rescue work after the earthquake, and on-site emergency training for non-professional rescue workers should be strengthened.
3, search and rescue operations should continue
Search and rescue after the earthquake to a certain extent, need to selectively clean up the ruins little by little. This is a very dangerous job because of the aftershock and the instability of damaged buildings. Be extra careful. What needs to be emphasized is that while the rubble is being cleared, it is necessary to continue the search work and be ready to rescue survivors who have not been discovered before. Therefore, search and rescue work should be continuous until all damaged buildings are inspected, the rubble clean-up work is completed, and the hope of finding survivors disappears completely. Search and rescue work should be declared ended. 
British professional rescue team share experiences in earthquake rescue
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