Tobacco axis flow is generally used for fire protection. At the beginning of the fire, it is used for smoke and high temperature resistance. The general design standard is running normally at 280 degrees temperature for half an hour.
Fire shaft flowers include smoke axis flowers and air supply air supply stream fans (the structural direction of the two is symmetrical).Essence
The axis flow fan is very wide, that is, the airflow in the same direction as the axis of the wind leaves, such as an electric fan, the air -conditioned aircraft fan is the axis flow method.The reason why it is called "axis flow" is because the gas flows parallel to the fan shaft.
When the leaves are rotated, the gas enters the impeller from the inlet axis, which is pushed by the leaves of the impeller to increase the energy of the gas, and then flow into the guidance.The guide leaves turn the deflection air into axial flow. At the same time, the gas is introduced into the voltage, which further converts the gas kinetic energy into pressure energy, and finally introduces the working pipeline.The working method of the shaft fan blade is similar to the wing of the aircraft.However, the latter uses the upward force to the wing and supports the weight of the aircraft, while the axial flow fan is fixed and the air moves.The cross section of the axial fans is generally winged.The blades can be fixed or rotated around its vertical axis.The angle of the blade and the airflow or the spacing of the blades can be adjusted or adjustable.Change the blade angle or spacing is one of the main advantages of axial flow fan.The distance between the small leaves generates lower the flow, and the increase can generate higher traffic.
Second, the difference between axial flow fan and centrifugal fan
1. Fortune fan changes the flow of the medium in the air duct, and the shaft flow fan does not change the flow of the medium in the air duct;
2. The formers air volume and wind pressure are very large, and the latters air volume and wind pressure are very low;
3. The former installation is more complicated, and the latter installation is simpler;
4. The former motor and fan are generally connected through the axis, and the latter motor is generally in the fan;
5. The former is often installed at the air -conditioning unit entrance and exit, boiler drums, campaign, etc., the latter is often installed in the duct, or the front end of the air duct exit.
3. How to solve the increase in the temperature of the bearing of the bearing machine
1. Ensure that there is a suitable gap between the bearing of the neck and the bearing of the bearing.The bearing gap directly affects the effect of the use of the fan. The shaft and the neck are too small. The amount of oil in the bearing in the bearing is reduced, the friction increases, and the heat produced cannot be taken away.Large, although it can reduce the resistance of the lubricating oil cycle. By increasing the amount of oil in the upper part of the neck, the heat generated by the friction of the neck and fan bearings is taken away to reduce the temperature of the fan bearings.The neck is 2.5/1000, and the effect is better.
2. Strictly control the alloy material of the bearing of the bearing of the bearing fans.If it does not meet the material standards, the fan bearings are prone to fatigue and wear, and the temperature will cause the temperature to increase.Generally, you can judge by listening and vibration measurement.
3. The bearing and the neck must have an appropriate contact angle and contact point.The bearings rely on high -speed rotating shafts to drive lubricating oil to lubricate the stress oil membrane with the fan bearings.Whether the contact point and contact angle between the bearing of the bearing of the bearing and the neck directly determine the height of the bearing temperature.Generally, when the contact angle is adjusted at 55 ° ~ 60 °, when the contact point of 2 to 4 contact points/CM3 is scraped within the contact range, the friction force is the least, the temperature is low, and the effect is good.
After understanding the analysis of changes in the temperature changes caused by the bearing of the axis flow machine, we can find a solution to solve this adverse phenomenon, thereby avoiding the temperature abnormal temperature of the entire device.