Views: 5 Author: Site Editor Publish Time: 2021-01-06 Origin: Site
Orchard fan is a new type of farm machinery used for fruit trees and other cash crops to return to green and bloom in spring and to solve the problem of low temperature frost. This article will introduce you to working principle of orchard fan.
The following knowledge points are listed below:
Working principle of orchard fan
Anti-frost effect of orchard fan
In the lower atmosphere, temperature generally decreases with height;But under the condition of early spring pollen, the ground because of radiation cooling and cooling, the closer from the ground, the faster the air cooling, and the upper air is affected by the ground the weak, slow cooling, temperature increases with the rise of the height of the trend, this phenomenon is called "inversion phenomenon" under the condition of the germination of fruit trees fight cold ability is reduced, the buds in 0 ℃ or so will be affected by mild cold injury, 39 ℃ ~ - 29 ℃ when severe cold injury ".Orchard fan uses the presence of an inversion layer to artificially alter weather conditions for frost protection.Its working principle is as follows: orchard fan system is used to physically disturb the air in the near-ground area. On the one hand, warm air above the orchard can be transported to the fruit tree canopy, and the cool and warm air can be fully mixed to raise the temperature of the fruit tree canopy and avoid falling below 0℃.On the other hand, the orchard near the ground air after the disturbance, the formation of micro-airflow, blowing water vapor, can reduce the formation of dew, so as to prevent frost;Even if frost is formed, it will also slow down the rate of frost, and reduce the secondary frost damage of buds and leaves.
Orchard fan mainly uses the "temperature inversion phenomenon" to raise the orchard temperature. The power source of orchard fan is agricultural electricity or diesel engine. The gearbox and transmission shaft drive the blades to rotate to generate wind energy.
(1) orchard fan can raise the air temperature on the ground and prevent the tree body temperature from falling below 0°C.
(2) orchard fan can stir up the near-ground air of the orchard to form a local airflow, which can disperse water vapor and air and reduce dew formation, thus preventing frost formation.
(3) even if the formation of frost, can also slow down the rate of frost, so as to reduce the secondary freezing damage of fruit buds.
(4) achieve environmental protection, efficient mechanization, automation of large areas of frost prevention.
1) Effects of tree growth habits on orchard fan effect.Apple tree frost critical temperature is -2c, orchard fan is effective for low temperature above -2°C. Orchard fan is ineffective if low temperature below 2°C lasts for more than 30 minutes and low temperature freeze occurs.The frost critical temperature of large cherry trees is -1°C, and orchard fan is effective for low temperature above -1°C. Orchard fan is ineffective if low temperature below 1°C lasts for more than 30 minutes and low temperature freeze occurs.
2) Effects of topography and orchard microclimate on orchard fan. Sichuan, flat,orchard fan effect is obvious, high fruit setting rate;The effect of orchard fan is not obvious and the fruit setting rate is low.
3) Different orchard fan models have different effects.Orchard fan large wind cover radius 80~100 m, sweep area of about 50 mu, frost prevention effect is good.Small orchard fan has a wind cover radius of 30~40 m and a sweep area of 8~10 mu.
Orchard fan has a certain warming effect with an auxiliary heat source.The large orchard fan is heated with coal, wood and other fuels to increase the orchard temperature by 2°C. Small orchard fan with auxiliary heating can raise the orchard temperature by 1~ 15 °C, effectively increasing the apple fruit setting rate (up to more than 50%).
Our orchard fan is widely used in orchards all over the country and has been well received. If you are looking for a reliable supplier of orchard fan, Press Brake, Shearing Machine please contact us.
