CN2623007Y - Constant negative pressure differentia irrigation device - Google Patents

Abstract

The utility model discloses a constant negative pressure difference irrigation device, which comprises a single or a plurality of seepage suction heads, the upper part of the seepage suction head is connected with a gas collection chamber whose upper opening is sealed by a sealing plug through a connecting pipe, the air collection chamber The side wall is connected with a water delivery pipe, which is characterized in that the other end of the water delivery pipe is inserted and connected with a water level regulator lower than the suction head. There is an overflow pipe on the upper side wall of the water level regulator, and an overflow measuring cylinder is placed under the overflow pipe. The water level regulator The upper part corresponds to the height of the overflow pipe, and a water pipe with a water stop is connected on the side wall, and the other end of the water pipe is connected upward with a water supply device with a metering scale. The utility model has the advantages of being able to automatically provide water with a constant negative pressure head to the soil, so that the soil can always be kept at a constant humidity suitable for crop growth, and has the advantages of various uses and a wide range of applications.

Description

Constant negative pressure difference irrigation device

Technical field:

The utility model relates to underground irrigation, in particular to a constant negative pressure difference irrigation device in which a negative pressure difference irrigation system is connected with a water supply device capable of controlling a constant negative pressure water head.

Background technique:

Negative pressure difference irrigation is a new irrigation method invented in Japan. It buries porous pipes into the ground and relies on the negative pressure difference between the water in the pipes and the surrounding soil for automatic irrigation. Automatically adjust the water volume; the seepage irrigation system introduced by the Nanjing Soil Research Institute of the Chinese Academy of Sciences is composed of a seepage head, a water delivery pipe and a water storage device. The water storage device can adjust the water level, and can use fertilizer and water at the same time. The disadvantage of using a water storage device to adjust the water level is that the water level changes during the irrigation process. When the soil humidity is in the low suction range, a small change in the suction can cause a significant nonlinear change in the soil moisture, and sometimes it is difficult to meet the requirements for crop growth. moisture requirements. The above-mentioned irrigation system has the following disadvantages: it cannot be used to accurately measure the short-term evapotranspiration of the soil, and its use and scope of use are relatively small.

Invention content:

The purpose of the utility model is to provide a constant negative pressure water head that can automatically provide soil with constant negative pressure water, so that the soil can always be kept at a constant humidity suitable for crop growth, and has various uses and a wide range of constant negative pressure difference irrigation devices.

The task of this utility model is accomplished in the following manner. This constant negative pressure difference irrigation device includes a single or multiple suction heads, and the upper part of the suction head is connected to a collection with an upper opening sealed by a sealing plug. The air chamber and the side wall of the air collection chamber are connected with a water delivery pipe, which is characterized in that: the other end of the water delivery pipe is inserted into a water level regulator lower than the suction head, and there is an overflow pipe on the upper side wall of the water level regulator. Place the overflow measuring cylinder, the upper part of the water level regulator is connected with a water pipe with a water stopper on the side wall corresponding to the height of the overflow pipe, and the other end of the water pipe is connected upward with a water supply device with a measuring scale, and the upper part of the water supply device is installed with a pressurized Water stop for water pipe connections. The water level regulator is filled with a filter layer that prevents solid particles and certain microorganisms from entering the water pipe. A water stopper is arranged on the water delivery pipe, and a suction liquid filling port with a water stopper is installed on the water delivery pipe at the upper part of the water stopper through a three-way joint. The utility model has the following advantages: 1. As long as the height of the water level controller is adjusted according to the change of the suitable soil humidity for the growth of the crops, the soil can be provided with the required constant negative pressure head water, so that the crops can grow in the soil with suitable humidity. grow. 2. Through the accurate measurement of the water supply device and the overflow measuring cylinder, it is possible to know at any time the amount of evaporation of the soil in different periods and the excess soil moisture discharged above the control humidity, and the solute content discharged in the soil can be measured by testing the discharged water. 3. The soil solution can also be pumped and the soil can be filled with water and infiltrated through the liquid pumping and filling port.

Description of drawings:

Fig. 1 is the structural representation of the utility model. In the figure, 1. Pressurized water pipe, 2. Water stopper, 3. Water supply device, 4. Water pipe, 5. Water stopper, 6. Filter layer, 7. Water level regulator, 8. Overflow bucket, 9. Overflow Water pipe, 10. water stop, 11. pumping liquid filling port, 12. water stop, 13. water delivery pipe, 14. gas collection chamber, 15. suction seepage head.

Detailed ways:

Embodiments are further described in conjunction with the above figures. The constant negative pressure difference irrigation device of the present utility model comprises single or a plurality of seepage suction heads 15, and the top of the seepage suction head 15 communicates with a gas collection chamber 14 through a pipe, and a sealing plug is arranged in the upper mouth of the gas collection chamber. There is a downward bending water pipe 13 connected to the side wall, and a set of constant water level controller is connected to the other end of the water pipe 13 below the suction head. The constant water level controller is based on the inverse ratio between the volume of a certain mass of gas and its pressure. It consists of a pressurized water pipe 1 and a graduated water supply device 3 that can be sealed with a water stopper 2 after adding water. The lower part of the water supply device 3 is connected to the water level regulator through the water pipe 4, and the water delivery pipe 13 is inserted into the water level regulator. There is a certain depth in 7, there is an overflow pipe 9 on the side wall of the top of the water level regulator 7, and an overflow bucket 8 is placed below the overflow pipe 9, and a water stop is connected to the side wall corresponding to the height of the overflow pipe on the top of the water level regulator 5 for water pipes 4. In order to protect the suction head 15, the filter layer 6 that can prevent solid particles and some microorganisms from entering the water pipe is filled around the water pipe in the water level regulator 7. In order to expand the purposes of this device, a water stopper 10 is housed on the water delivery pipe, and a liquid suction and filling port 11 with a water stopper 12 is installed on the top of the water stopper 10 through a three-way joint. When in use, close the water stop 5 on the water pipe 4, open the water stop 2 of the pressurized water pipe 1 to supply water to the water supply 3, close the water stop 2 after the water is full, open the water stop 5, and supply water to the water level regulator 7 And adjust the height of the water level regulator 7 and the overflow pipe 9, adjust to as long as the water level of the water level regulator is lowered to less than one centimeter, the air of the water level regulator will go through the water pipe 4 to replenish the water supply, so that the water of the water supply will be replenished to the water level When the water level behind the regulator rises to less than one centimeter, the overflow pipe 9 seems to be overflowing but does not overflow, and the replenishment stops. After the controller system is adjusted, adjust the water level of the system and the relative height difference between the suction and seepage head 15 to make it equal to the soil The suction value to control the humidity. Then the water stopper 10 on the water delivery pipe 13 is water-stopped, the air-collecting chamber 14 is opened to pump air and reduce pressure and is filled with water to seal, and then the water stopper 10 is opened, and it is to be balanced for a period of time, because the crop consumes water and the soil evaporates. Water loss, when the soil suction is greater than the water level difference between the suction head and the constant water level controller system, that is, the suction maintained by the suction head, the water in the water level regulator 7 flows to the suction head 15 through the water delivery pipe 13, and the water supply is fed into the water supply Water level regulator 7 and water level descends, and descending value is evacuation amount. Because precipitation or flushing salt soil suction is less than the suction that suction seepage head 15 keeps, overflow pipe 9 can have water to flow out to overflow bucket 8, and outflow water can be measured, and can also be used for analyzing its solute type and quantity. If you want to extract the soil solution, connect the soil solution extraction device on the suction liquid filling port 11, open the water stop 12 and close the water stop 10, and depressurize and pump air. If the soil water is to be increased rapidly, the water source pipe can be connected to the pumping liquid filling port 11, the water stop 10 is closed, the water stop 12 is opened, or the water level of the water level regulator is raised to be equal to or higher than the suction head 15 The buried position can realize pressureless irrigation or seepage irrigation.

Claims (3)

1. Constant negative pressure difference irrigation device, which includes a single or multiple suction heads. The upper part of the suction head is connected to a gas collection chamber with an upper opening sealed by a sealing plug through a connecting pipe. The side wall of the gas collection chamber is connected with a The water delivery pipe is characterized in that: the other end of the water delivery pipe is inserted and connected with a water level regulator lower than the suction head, there is an overflow pipe on the side wall of the upper part of the water level regulator, and an overflow measuring cylinder is placed under the overflow pipe, and the height of the upper part of the water level regulator and the overflow pipe is The corresponding side wall is communicated with a water pipe with a water stopper, and the other end of the water pipe is upwardly connected with a water supply device with a measuring scale, and a water stop device connected with a pressurized water pipe is installed on the upper part of the water supply device. 2. The constant negative pressure difference irrigation device according to claim 1, characterized in that: the water level regulator is filled with a filter layer that can prevent solid particles and certain microorganisms from entering the water delivery pipe. 3. The constant negative pressure difference irrigation device according to claim 1, characterized in that a water stop is installed on the above-mentioned water delivery pipe, and a water stop with a water stop is installed on the upper water delivery pipe through a three-way joint. Liquid pumping port.

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