Novel non-pressure irrigation rig

Abstract

The invention relates to a novel non-pressure irrigation rig. The water outlet valve of a water supply tank is opened, irrigation water flows into a water level control tank, when the water level of the tank is higher than h1, an intake tube is submerged, air suction is changed into water inflow until the water level in the intake tube is equal to the water level in the water supply tank, the irrigation water does not flow into the water level control tank, the water level of the tank is stabilized at the water level slightly higher than h1, the irrigation water enters into a filling area at the upper part in a U-shaped slot by virtue of a permeable cover plate and a sand inverted filter from the bottom in the U-shaped slot of the irrigator, a soil saturation water layer which is at the same height of the water level of the water level control tank and is lower than the upper edge of the U-shaped slot, water of the saturation water layer rises to the root layer of a crop in a capillary water way, a crop consumes water to cause the water level of the water level control tank to be lower than h1, the intake tube comes out of water surface, air is sucked in air bubbles, the irrigation water flows into the water level control tank, the water level rises to submerge the intake tube again, the crop consumes the water to cause the water supply process to be repeated, the output of supplying water is increased or reduced along with water consumption, irrigation is adaptive, and the irrigation rig is simple to operate and is convenient to use.

Description

Technical field: [0001] The invention relates to a farmland irrigation device, in particular to a novel pressureless irrigation device. Background technique: [0002] The so-called non-pressure irrigation in the present invention is derived from the definition of negative pressure irrigation, that is, the elevation of the irrigation water source is lower than the elevation of the sprinkler, and the water supply head is negative during operation, which is called negative pressure irrigation. It is an irrigation method in which the elevation of the irrigation water source is equal to the elevation of the emitter. Negative pressure irrigation uses the water potential energy difference and capillary action of soil, plants, and atmosphere to irrigate, and is by far the most efficient irrigation method. The irrigation process is carried out automatically, and there is no need to make decisions about irrigation time and irrigation amount, and the amount of water is supplied as muc...

AI Technical Summary

Problems solved by technology

However, it is very difficult to implement negative pressure irrigation. First, there are very strict requirements on the sealing of the water delivery system, and there must be no air leakage. Especially, once the seal of the underground part is damaged, it will be very difficult to find and repair; The gas dissolved in the water will be precipitated, if it is not dealt with in time, it will cause a cut-off

Therefore, regular exhaust is needed, and the exhaust process is very complicated and cumbersome, laborious and time-consuming, and also increases the difficulty of management; the third is the unique structure of the negative pressure sprinkler (the negative pressure sprinkler exchanges with soil water) The prerequisite is that the outer wall can form a permeable and airtight water film) so that the water output is too small and the soil wetting range is limited. The only way to improve the uniformity of humidity is to increase the density of negative pressure sprinklers or increase the water supply surface of a single negative pressure sprinkler. Fourth, the negative pressure sprinkler is different from the soil texture, and there are obvious interfaces with discontinuous pores and inconsistent sizes. Whether the water supply is smooth or not depends on the contact between the negative pressure sprinkler and the soil. degree of tightness, with some uncertainty

Even if the original negative pressure irrigation system can be adjusted to the non-pressure irrigation state, the above problems cannot be solved fundamentally. The development and invention of a new type of non-pressure irrigation device will become an inevitable choice

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