System for cool water curtain in agricultural greenhouse

Abstract

A system for cool water curtain in agricultural greenhouse Including greenhouse frame, canopy roof frame, curtain rolling mechanism, water curtain device and fan, a large shed roof frame is connectedwith that top of the shed frame, A roll-up shutter mechanism is composed of angle iron, Motor, reel, seat bearing, A suspension curtain and a lifting rod are for, A water curtain device comprises a water curtain frame, water inlet pipe, made of paper strips and triangular cardboard, the paper strip has a continuous "S"-shaped structure, and the protrusions of the adjacent "S" type structure are bonded to each other, so that the water curtain is formed into a plurality of groups of waterfall-type outlet water, and the fan is convenient to quickly pump the moist air from one end of the greenhouse to the other end, and then discharges the moist air to the outside of the greenhouse so as to realize cooling, meanwhile, the humidity in the greenhouse is not high, and microbial growth is avoided.

Description

technical field [0001] The invention belongs to the technical field of greenhouse planting, in particular, the invention relates to an agricultural greenhouse water curtain cooling system. Background technique [0002] When using agricultural greenhouses for planting, it is often necessary to control the temperature in the agricultural greenhouses so that fruits and vegetables have a more suitable growth temperature. The cooling methods currently used are: [0003] 1. Greenhouse ventilation: It can reduce the indoor temperature and make it close to the external temperature. The natural ventilation of top opening windows and side opening windows can achieve good results. When the window opening area is 15%-30% of the greenhouse area, it is considered sufficient, and the portion exceeding 30% has little effect on the cooling effect. The anti-insect net installed in the ventilation window will significantly reduce the airflow velocity and increase the temperature gradient in ...

AI Technical Summary

Problems solved by technology

In tropical windless areas where the external ambient temperature is higher than 35°C and the internal temperature of the greenhouse is higher than 42°C, the cooling effect of the natural ventilation system is not significant, and the room temperature can only be reduced by 2-3°C during the period of plant flowering and fruit setting. Far from being able to meet the requirements of plant growth

[0004] 2. Greenhouse mechanical ventilation: Although it can greatly increase the air exchange volume in the greenhouse, in the extremely hot summer conditions, it is far from achieving a significant cooling effect by only using fan equipment to move out the indoor hot air, and the basic ventilation is normal. Volume over 0.05m 3 / ㎡-s, the fan cooling effect is no longer obvious

In addition, too high humidity in the greenhouse can easily cause microorganisms to grow and increase the chance of plants being infected with germs

[0006] 4. Greenhouse atomization system: it can lower the room temperature by 3-8°C, and can provide a relatively stable temperature and humidity distribution in the greenhouse. However, the system needs to be equipped with a high-pressure atomized water droplet nozzle and a nozzle network, and the cost is too high. High, and there are the same problems as the wet curtain-fan system that make the humidity inside the greenhouse too high, which causes the growth of microorganisms and increases the chance of plants being infected with germs, etc.

In addition, when the external humidity is too high (such as the rainy season), the cooling effect of the atomization system will be significantly reduced.

[0007] 5. Greenhouse roof spraying system: Compared with evaporative cooling systems such as wet curtain-fan and atomization, the roof spraying system increases the relative humidity of the roof and does not affect the indoor humidity, so it avoids the former two to promote the growth of microorganisms problem, but usually only lowers the room temperature by 3-5°C

Since the sprinkler system is installed on the top of the greenhouse, it can only reduce the air temperature at the top

[0008] 6. Mechanical refrigeration: Generally, in addition to the temperature of the nutrient solution used in special environments (such as tissue culture and controlled hydroponics), in large greenhouses or greenhouses due to their large area and high heat load, mechanical refrigeration equipment and high operating costs, it is extremely uneconomical to use

[0009] 7. Soil-air heat exchange cooling system: Compared with the control greenhouse, it can reduce the room temperature by 3-5°C, but its biggest disadvantage is that it costs a lot, and a lot of money needs to be used for digging and burying underground pipelines

This method uses the sensible heat of water to increase the temperature of the indoor air, but the sensible heat of water is small, the cooling capacity is poor, and a large amount of low-temperature water is consumed.

[0011] Compared with the above-mentioned cooling methods for agricultural greenhouses, it is better to install a cooling curtain-fan system in the greenhouse, but the current greenhouse installation of the cooling curtain-fan system makes the humidity in the greenhouse too high, which is easy to cause microorganisms to grow and increase chance of plant infection

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