JPH05304845A - Underground irrigator with solar water heater - Google Patents

Abstract

PURPOSE:To reutilize water by carrying out the underground irrigation using hot water and circulating irrigating water. CONSTITUTION:A solar water heater 1, a hot water tank 2 and a water storage tank 3 are installed and a mixer 16 and a control means 4 for mixing the hot water from the hot water tank 2 with water from the water storage tank 3 and regulating the water to a prescribed temperature are installed. Furthermore, a water supply pump 5 and a water supply pipe 6 for supplying the hot water into soil are provided. A water feeder 8 is provided in the course of the water supply pipe 6. A water holding wall 7 for surrounding the water feeder 8 and the soil is installed and equipped with a water drain port 71 for keeping the water level of irrigating water constant. A water drain tank 11 for storing the irrigating water from the water drain port 71 is installed and a recycling pump 10 and a return pipe 12 for returning the irrigating water in the water drain tank 11 to the water storage tank 3 are provided. Thereby, the raising of a plant can be controlled by underground heating with the hot water. The water can effectively be utilized by reutilizing the irrigating water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground irrigation system for supplying water to the roots of cultivated plants from the soil,
In particular, the present invention relates to an underground irrigation system that supplies hot water heated by a solar water heater.

[0002]

2. Description of the Related Art As a conventional irrigation method for agricultural crops and flowers, a method of sprinkling water from the upper surface of a cultivated plant using a sprinkler has been the main method. However, the method of sprinkling water from the upper surface of this cultivated plant, only a small part of the sprinkled water is absorbed by the root part of the cultivated plant, and most of it is evaporated. Will be lost. Further, as means for solving the problem of loss due to evaporation from the surface of the cultivated soil described above, Japanese Patent Laid-Open No. 54-
A method of supplying water to the root portion of a cultivated plant from a water permeable pipe buried in soil as described in Japanese Patent No. 60137 has already been devised and known.

[0003]

As shown in FIGS. 5 and 6, this is a water supply pipe 500 buried in the cultivated soil 100 and a water permeable pipe 300 provided at an appropriate position of the water supply pipe 500. It consists of by the way,
Part of the water supplied from the water permeable pipe 300 into the soil 100 is absorbed by the roots of the cultivated plant 200, but most of it is evaporated from the soil surface or diffused into the surrounding soil. Etc. will be dissipated. Therefore,
It is insufficient in terms of effective use of irrigation water. Moreover, in the said underground irrigation system, when the said water permeable pipe 300 is brought too close to the root part of the cultivated plant 200, the said water permeable pipe 300.
Due to the water supply from the above, the soil around the root of the cultivated plant 200 is washed away, and there is a problem that the root cannot be normally stretched.

Further, in the underground irrigation system, if the amount of water supplied from the water permeable pipe 300 is erroneously adjusted, the cultivated plant 200 will die if it is too small, and root rot will occur if it is too large. Furthermore, if too much inorganic fertilizer is applied to both the sprinkler method and the underground irrigation method, cultivated plants 2
The fertilizer not consumed at 00 accumulates in the soil and is deposited on the surface layer to cause salt damage. It is an object of the present invention to solve these problems and to provide an underground irrigation device that can control the growth of cultivated plants by heating the cultivated soil regardless of the natural environment ( Issue).

[0005]

In order to solve the above-mentioned problems, the following means are taken in the present invention. That is, in the underground irrigation system of the method of supplying water from the soil to the root part of the plant by the water supply device buried underground, etc., having a solar water heater utilizing solar heat, while supplying water for supplying water to the plant It has a water storage tank for storing, mixes the water in the water storage tank with the hot water from the solar water heater, and has a control means for adjusting these to a predetermined temperature, and the hot water adjusted to the predetermined temperature is already stored. It has a water supply pump and a water supply pipe for supplying to a water supply device buried underground, and surrounds the water supply device and the soil in which the water supply device is buried in a liquid-tight state, and from the water supply device to the above The hot water level supplied to the soil has a water retaining wall that is provided with a drainage port that controls the water level so that it is maintained at a constant value, and excess warm water (irrigation water) discharged from the drainage port is removed. In the water tank above It was decided to adopt a configuration having a recycling pump and a return pipe Sutame.

[0006]

In the present invention, the hot water heated by the solar water heater 1 is accumulated in the hot water tank 2 while the water storage tank 3 is provided with irrigation water as shown in FIG. Is stored. These water and hot water are introduced into the mixing device 16 and mixed so as to reach a predetermined temperature based on the operation of the control means 4. The hot water adjusted to this predetermined temperature is guided to the water supply pipe 6 by the water supply pump 5, and is further supplied to the water supply device 8 buried in the soil. The hot water supplied to the water supply device 8 is supplied to the soil from here. By the way, the soil in which the plant 9 is cultivated has three layers as shown in FIG. That is, the buried portion of the water supply device 8 forms a crushed stone layer 15 in which crushed stones having a relatively large diameter are spread, and an upper portion thereof forms a sand layer in which sand having a small diameter is spread. The upper part, that is, the part where the plants are planted forms a corrosive soil layer in which corrosive soil or the like is spread. The warm water supplied into the soil having such a soil structure gradually rises between the layers based on the so-called capillary phenomenon, reaches the root of the plant 9, and is absorbed by the plant 9 there.

On the other hand, hot water other than the hot water (irrigation water) absorbed by the plants 9 stays around the water supply device 8, but the soil in which the water supply device 8 is buried is Since the surroundings are surrounded by the water retaining wall 7 and the water retaining wall 7 is provided with the drainage port 71,
Excess irrigation water is discharged to the drainage tank 11 via the drainage port 71. Then, the surplus irrigation water discharged to the drainage tank 11 is sent out by the recycle pump 10 and returned to the water storage tank 3 through the return pipe 12. As described above, in the present invention, the irrigation water once used for irrigation is stored in the drainage tank 11, returned to the original state by the recycling pump 10 and the return pipe 12, and reused.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the configuration of the present embodiment is such that a solar water heater 1 utilizing solar heat, a hot water tank 2 for accumulating hot water generated by the solar water heater 1, ground water, rainwater, etc. are stored. The water storage tank 3, a mixing device 16 for mixing the hot water in the hot water tank 2 and the water in the water storage tank 3, a control means 4 for adjusting the temperature of the hot water mixed in the mixing device 16, Water supply pump 5 that sends hot water adjusted to a predetermined temperature into the soil
And a water supply pipe 6 and a water supply device 8 for supplying hot water from the water supply pump 5 into the soil, and a water retaining wall 7 surrounding the water supply device 8 and the soil in which the water supply device 8 is buried in a liquid-tight state. A drainage tank 11 for storing excess irrigation water that is hot water (irrigation water) supplied from the water supply device 8; a recycling pump 10 for returning drainage in the drainage tank 11 to the water storage tank 3; It is basically composed of a return pipe 12.

In these basic constructions, the water heater 1 is of a heat exchange system formed by a double vacuum glass pipe or the like, and the hot water tank 2 stores heat by these heat exchangers or the like. It is configured to store hot water (hot water). The hot water tank 2 and the mixing device 16 are connected by a hot water pipe 17. Further, the soil in which the water supply device 8 is buried is basically composed of three layers as shown in FIG. That is, a portion of the lowermost layer in which the water supply device 8 is buried forms a crushed stone layer 15 made of gravel or the like having a relatively large diameter, and an upper portion thereof forms a sand layer 14 made of small-grained sand or the like. Is configured to form a corrosive soil layer 13 made of corrosive soil or the like.

Further, a water-retaining member made of a liquid-tight plastic sheet or the like so that the warm water supplied from the water supply device 8 does not diffuse infinitely around the water supply device 8 and the soil in which they are buried. There is a wall 7,
As shown in FIG. 1, the water retaining wall 7 is provided with a drainage port 71 for keeping the water level of the warm water supplied from the water supplying device 8 at a constant value H. Further, the drainage tank 71 is provided with a drainage tank 11 which stores the excess hot water (irrigation water) discharged from the drainage outlet 71 continuously. In addition, in the soil in which the water supply device 8 is buried, there is provided a sensor 18 for detecting the temperature and humidity in the soil, and further the water level of hot water. Various data such as temperature, humidity and water level are fed back to the control means 4.

Next, the detailed configuration of the water supply device 8 used in this embodiment will be described. The water supply device 8 is
As shown in FIG. 3 and FIG. 4, it has a cylindrical shape provided in a part of the water supply pipe 6. That is, as shown in FIG. 3, a socket-shaped cap 86 is provided on a part of the water supply pipe 6 by screwing, the screwed caps 86 are provided on both sides, and a bellows tube 88 is provided between them.
Is provided, and the mesh screens 85, 87, 89 are provided on the outside thereof.
Are provided over three layers, and the end of the mesh screen 85 provided at the outermost layer of these mesh screens is provided with a circumferential groove 861 provided at the end of the cap 86 using a tightening band 81. In addition, it is configured to be tightened so as to be engaged. In this embodiment, each component forming the water supply device 8 is basically made of resin in consideration of corrosion resistance in soil.

Further, the bellows tube 88 provided in the water supply device 8 is provided with a plurality of small holes 84 radially in the valley portion, and the water is supplied from the water supply pipe 6 via the small holes 84. The warmed water will be supplied to the soil. An underground irrigation system is formed by providing an appropriate number of such water supply devices 8 in a part of the water supply pipe 6 which is buried in the soil.

An operation mode of the present embodiment having the above-mentioned structure will be described. In FIG. 1, the warm water warmed by the solar water heater 1 and accumulated in the warm water tank 2 is guided to the mixing device 16 via the warm water pipe 17. Here, the hot water, which has been mixed with an appropriate amount of water stored in the water storage tank 3 and adjusted to a predetermined temperature by the control means 4, is supplied to the water supply device 8 via the water supply pipe 6 by the water supply pump 5. Supplied. Here, the hot water is the bellows tube 8 as shown in FIGS.
8 through the small holes 84, through the gap 83 provided between the valley portion of the bellows tube 88 and the mesh screen 87, and further through the mesh screens 87, 89,
Water is passed through the 85 mesh part and fed into the soil. The hot water supplied to the soil stays in the crushed stone layer 15 in the soil as shown in FIG. After that, the hot water permeates the sand layer 14 and the corrosive soil layer 13 by the capillary phenomenon and is absorbed by the roots of the plant 9.

On the other hand, hot water other than the hot water absorbed by the plants 9 will be retained around the crushed stone layer 15, but the water retaining wall 7 provided around the soil is shown in FIG. As shown, since the drainage port 71 is provided, excess hot water is discharged from the drainage port 71 to the drainage tank 11 side, and the water level of the hot water is the value of H shown in FIG. It is maintained at a constant value without exceeding it. As a result, the soil is kept at a constant temperature by the action of the retained hot water kept at the constant water level, and it becomes possible to control the growth of the plant 9 and the like. In addition, excess water is not supplied to the root portion of the plant 9, and it is possible to avoid inconvenience such as root rot.

As shown in FIGS. 3 and 4, the water supply device 8 has a structure in which three layers of mesh screens 87, 89 and 85 are provided outside the bellows tube 88, such as earth and sand. In addition to the prevention of clogging due to the above, a suitable gap 83 is provided between the trough where the small holes 84 through which the warm water flows is provided and the mesh screen 87. Since this space serves as an air reservoir, warm water flows into the soil (water supply).
Will be performed efficiently. The surplus of the warm water supplied in this way, or rainwater that has penetrated into the soil due to a large amount of rainfall, etc., is discharged to the drainage tank 11 through the drainage port 71, and then the recycling pump 10 is used.
Then, the water is returned to the water storage tank 3 via the return pipe 12 and the irrigation water is reused.

[0016]

EFFECTS OF THE INVENTION According to the present invention, an underground irrigation system for supplying water from the soil to the root portion of a plant, a solar water heater utilizing solar heat, and water for supplying water to the root portion of the plant are stored. A storage tank to be placed, a mixing device and control means for mixing the water in the storage tank with the hot water from the solar water heater and adjusting the temperature to a predetermined temperature, and for sending the hot water adjusted by the control means to the underground. Water supply pump and water supply pipe, a water supply device embedded in the soil in the middle of the water supply pipe, a water retention wall surrounding the water supply device and the soil around the water supply device in a liquid-tight state, and the water retention From the drainage tank that stores the excess irrigation water discharged from the drainage port provided on the wall, and the recycling pump and the return pipe for returning the excess irrigation water stored in the drainage tank to the water storage tank. Na Since it has a configuration, it is possible to control the temperature in the soil rooted by the plant to a predetermined temperature, and thereby it is possible to control the growth of the cultivated plant, other than the water absorbed from the root portion of the plant. It has become possible to collect and reuse irrigation water.

Further, the soil according to the present invention has a three-layer structure, and the water retaining wall surrounding the soil is provided with a drainage port, whereby the water level of the irrigation water is kept constant. As a result, the roots of plants are constantly replenished with a certain amount of water based on the capillary phenomenon, which makes it possible to replenish water in an optimal state for growing plants. Further, the present invention has a configuration in which the upper side of the soil in which the plant is cultivated is open to the natural space, so the soil is washed by natural rainfall and the like, and the salt content accumulated in the soil, It will be dissolved in the irrigation water that stays in the crushed stone layer at the bottom, and then discharged to the drainage tank and neutralized there, so it is possible to prevent the occurrence of salt damage in the so-called soil surface layer. Became. Furthermore, the water supply device according to the present invention is based on a bellows tube and has a structure in which a multi-layer mesh screen is provided on the outside thereof, so that the water supply device may be clogged during use. It became possible to always supply a fixed amount of water.

[Brief description of drawings]

FIG. 1 is a skeleton structure diagram showing an overall configuration of the present invention.

FIG. 2 is a partial cross-sectional view showing the relationship between the water supply device according to the present invention and the soil in which the water supply device is buried.

FIG. 3 is a vertical sectional view showing the structure of the water supply device according to the present invention.

4 is a cross-sectional view showing the structure of the water supply device according to the present invention, which is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a diagram showing an arrangement state of a water supply device (water permeable pipe) in soil in a conventional example.

FIG. 6 is a diagram showing a positional relationship between a root of a cultivated plant and a water supply device (water permeable pipe) in a conventional example.

[Explanation of symbols]

 1 Solar water heater 2 Hot water tank 3 Water storage tank 4 Control means 5 Water supply pump 6 Water supply pipe 7 Water retaining wall 8 Water supply device 9 Plant 10 Recycle pump 11 Drainage tank 12 Return pipe 13 Corrosion soil layer 14 Sand layer 15 Mixing device 16 Mixing device 17 Hot water Pipe 18 Sensor 71 Drainage port 81 Band 82 Gap 83 Gap 84 Small hole 85 Mesh screen 86 Cap 87 Mesh screen 88 Bellows tube 89 Mesh screen 861 Circumferential groove

Claims (2)

[Claims] 1. An underground irrigation system in which water is supplied to the roots of plants from the soil by means of a water supply device buried underground, etc., which has a solar water heater utilizing solar heat, while supplying water to plants. A water storage tank for storing the water, the water in the water storage tank and hot water from the solar water heater are mixed, and a control means for adjusting them to a predetermined temperature is provided, and the temperature is adjusted to the predetermined temperature. It has a water supply pump and a water supply pipe for supplying hot water to a water supply device already buried underground, and surrounds the water supply device and the soil in which the water supply device is buried in a liquid-tight state, and There is a water retaining wall that is provided with a drainage port that controls so that the water level of the warm water supplied from the device to the soil is maintained at a constant value, and excess warm water discharged from the drainage port (irrigation water ) To the above water tank An underground irrigation system with a solar water heater, characterized by comprising a recycling pump for returning and a return pipe. 2. A bellows tube having a plurality of small holes in a trough and a plurality of layers outside the bellows tube, which is a part of a water supply pipe for guiding hot water underground from a water supply pump and which is buried underground. The underground irrigation system with a solar water heater according to claim 1, wherein a water supply device including a mesh screen provided is appropriately arranged at a plurality of locations.