The difference between axis flow and mixed flow
1. Corresponding fan
Relying on the input mechanical energy to improve the mechanical of gas pressure and gases, it is a kind of mobilized fluid machinery.
Corporation is widely used for::
① The ventilation, dust and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings;
② The ventilation and winding of boilers and industrial furnaces;
③ Cooling and ventilation in air adjustment equipment and household appliances;
④ The drying and selection of grains;
⑤ The inflatable and promotion of wind tunnels and air cushion boats.
2. Bearing fans
It is the airflow in the same direction as the axis of the wind leaves, such as an electric fan, and the air -conditioned aircraft fan is a shaft running fan.The reason why it is called "axis flow" is because the gas flows parallel to the fan shaft.
Axial flow fans are usually used in occasions with high traffic requirements and lower pressure requirements.
The axial fans are fixed and the air moves.
Small axis flowers: low power consumption, fast heat dissipation, low noise, energy saving and environmental protection.Due to the wide size of the size.
Large axis flow fan: It has the characteristics of simple structure, stable reliability, small noise, large air volume, and wide range of functional selection.
3. Cingard fan/mixed flow fan
Fans between the axis fans and the centrifugal fan. The impeller of the oblique fan allows the air to do both centrifugal motion and axial motion.
Combined with the characteristics of axial flow and centrifugal fans, although it looks more like a traditional axial flow fan.Wed the curved plate blades on the tone steel wheels.Change the traffic by changing the angle of the blades in the upstream entrance of the leaf wheel.The shell can have an open entrance, but the more common situation is that it has a right -angle bending shape, so that the motor can be placed outside the pipeline.The excretion shell slowly expands to slow down the speed of air or gas flow, and converts the kinetic energy into useful static pressure.
It is mainly used for ore ventilation and tunnel ventilation.
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 former is more complicated.
3. The former motor and fan are generally driven by the belt to drive the rotor. The latter motor is generally in the fan;
4. The former is often installed at the air -conditioning unit entrance and exit, boiler drums, campaign, and so on.The latter is often installed in the air duct, or the front end of the air duct exit.
5. The former is pressurized after the air income, and the latter is a positive pressure driver.
Crowd (mixed flow) fan:
1. The wind pressure coefficient is higher than the axis flowers, and the flow coefficient is larger than the centrifugal fan.
2. Fill the gap between the axis flow fan and the centrifugal fan.
3. Simple and convenient installation.
The difference between the centrifugal fan and the axis fans when starting:
The operating power of the centrifugal fan increases with the increase of the air volume, so when the centrifugal fan is started, the wind gate must be closed, and then gradually open to avoid burning the motor from the large air current.
The operating power of the axis fans decreases as the air volume increases, so when the axis flower is started, the wind door should be fully turned on, and then gradually close to the required air volume value.
Two types
The role of axis flow fan and centrifugal fan in mechanical ventilation:
1. Due to the difference between temperature and food temperature, a ventilation time must be selected during the day to reduce the gap between the mild temperature and reduce the occurrence of exposure.In the future, the ventilation should be carried out at night, because this ventilation is mainly based on cooling, the atmosphere is relatively high and low at night, and the temperature is low.Essence
2. In the early days of ventilation of centrifugal fans, doors and windows, walls are exposed, and even surface grains are slightly exposed.Just outside the warehouse.With the use of axis flowers for slow ventilation, the phenomenon of knitting will not occur. Only the temperature temperature of the middle and upper layers will rise slowly. As the ventilation continues to continue the grain temperature, it will decrease steadily.
3. When using a bearing fans for slow ventilation, due to the small air volume of the axis fans, in addition, the grain is a bad conductor of the heat. In the early days of ventilation, the ventilation of individual parts is slow.Essence
4. The advantages of slow ventilation with a bearing fans: good cooling effect; low energy consumption, which is especially important today; the ventilation timing is easy to master and it is not easy to expose; it does not need to be equipped with a fan alone, which is convenient and flexible.Disadvantages: Due to the small air volume, long ventilation time; the effect of precipitation is not obvious, and high -water places should not be ventilated with axis flowers.
5. Advantages of centrifugal fan: cooling, precipitation effect, short ventilation time;
Disadvantages: High energy consumption in the unit; the ventilation timing is not easy to show.
Border wall explosion -proof shaft flow fan rainfall and insect -proof edge wall fan
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The side wall of the side wall is strong, thick, material integrated molding