A passive automatic control device for farmland irrigation

Abstract

The invention discloses an automatic control device for passive farmland irrigation. The automatic control device mainly comprises a water storage tank, a pressure boosting mechanism, a valve flap, a floating ball guide mechanism and a buffer supporting part, wherein the buffer supporting part comprises a buffer plate and a pair of supporting columns installed on the buffer plate; each supporting column consists of a threaded connection screw rod in a threaded sleeve; the top end of each screw rod is provided with a supporting block or a supporting ball which supports the water storage tank; the water storage tank is of a fully-sealed structure, and is formed by connecting a water storage tank bottom plate and a water storage tank shell. The automatic control device has the advantages that the lifting of a floating ball in the floating ball guide mechanism is controlled by using the depth of a water layer in a farmland, so that the action of the valve flap in the water storage tank is further driven to realize water supply or discharge; when the valve flap is closed, the floating ball is used for guiding, and finally, the valve is closed by using water pressure; under the demand of shallow water supply, good sealing can still be realized; moreover, whole or independent height adjustment can be implemented in combination with the height of the floating ball of the floating ball guide mechanism, so that the depth of water level can be freely adjusted within the scope of 1-7cm to meet the demands of different-depth water supply.

Description

technical field [0001] The invention relates to a passive automatic control device for farmland irrigation, in particular to a passive automatic control device for farmland irrigation with wide water adjustment range and accurate irrigation. Background technique [0002] Agricultural irrigation mainly refers to the irrigation of agricultural farming areas. Agricultural irrigation methods can generally be divided into traditional surface irrigation, ordinary sprinkler irrigation and micro-irrigation. In the traditional ground irrigation method, water enters the field from the ground surface and infiltrates the soil by gravity and capillary action, so it is also called gravity irrigation. This method is the oldest and is currently the most widely used and most important irrigation method. At present, in rural areas, submerged irrigation, that is, the traditional gravity irrigation method, is generally used. [0003] According to statistics, my country's agricultural irrigati...

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Problems solved by technology

[0006] However, there are still certain defects: the buoyancy of the buoyancy tank is used to control the closing of the valve clack, and the buoyancy requirement is relatively large when closing, otherwise the valve clack will not be closed tightly, causing leakage, and then there will be continuous small flow uninterrupted water supply. Phenomenon, and paddy field irrigation requires intermittent water supply to avoid rice seedlings being submerged and airless for a long time, so this problem has a fatal impact on paddy field irrigation;

[0007] However, if the closure is to be completely realized, the buoyancy tank needs to be made very large; in addition, when a small amount of water is supplied, since the liquid level changes little and the buoyancy is not sensitive to changes, this structure cannot accurately realize the small amount of water supply, satisfying The application of paddy shallow wet irrigation planting technology

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