CN108738443B

CN108738443B - Irrigation system

Info

Publication number: CN108738443B
Application number: CN201810928035.XA
Authority: CN
Inventors: 周兆媛; 韩德梁; 赵立敏; 田超; 王鹤立; 赵欣胜; 李云飞
Original assignee: Beautiful Land Beijing Ecological Environment Engineering Technology Research Institute Co ltd
Current assignee: Beautiful Land Beijing Ecological Environment Engineering Technology Research Institute Co ltd
Priority date: 2018-08-15
Filing date: 2018-08-15
Publication date: 2023-06-09
Anticipated expiration: 2038-08-15
Also published as: CN108738443A

Abstract

The invention provides an irrigation system, which relates to the technical field of soil irrigation restoration, and the irrigation device provided by the invention comprises: the water tank, the water pump and the restoration material jar are provided with feed liquor pipe and drain pipe on the water pump, the feed liquor pipe and the water tank fluid intercommunication of water pump are provided with the material export on the restoration material jar, the material export and the drain pipe fluid intercommunication of water pump of restoration material jar can realize the restoration to saline and alkaline soil when irrigating, reduce soil salt content, adjust soil pH value, improve soil structure, be favorable to promoting irrigation effect, promote vegetation, and soil restoration agent can avoid the water pump to be corroded or to block up by the water pump, also can be according to the delivery volume of rivers flow automatically regulated soil restoration agent.

Description

Irrigation system

Technical Field

The invention relates to the technical field of soil irrigation restoration, in particular to an irrigation system.

Background

The saline-alkali soil area in China exceeds 5 hundred million mu, and the development and utilization potential is huge. Water is the carrier of salt, and the salt in the soil moves with the water, "salt comes with water, salt goes with water". The irrigation salt washing is to utilize the water-salt migration law of the saline-alkali soil, irrigate water into the saline-alkali soil to fully dissolve salt in the soil, drain soluble salt in the surface soil layer into deep soil or rinse out through infiltration, thereby reducing the salt content of the soil and controlling the salt content in the soil within a range suitable for plant growth. The traditional irrigation method for leaching the salt is mainly characterized in that large water flood irrigation is used, on one hand, water sources are wasted, the soil humidity is saturated, aggregates are broken, dispersed soil particles move downwards along with water flow, part of soil pores are blocked, the soil water conductivity is further reduced, and therefore the salt leaching effect is affected; on the other hand, the ground water level is raised, and after the water is evaporated, the salt on the surface layer of the soil is increased, so that the soil is subjected to secondary salinization. Therefore, how to timely regulate the moisture and salinity of soil (especially plant root layer soil) through irrigation, which is beneficial to plant growth, reduces the loss of evaporation, leakage and the like, avoids the initiation of secondary salinization of the soil, and improves the saline-alkali soil, thereby being a difficult problem to be solved in realizing sustainable utilization of the saline-alkali soil.

For example, patent document CN106332742a discloses an automatic intelligent irrigation system. The signal output part of the controller is respectively and electrically connected with the signal input parts of the motor, the suspension arm and the water pump, a plurality of groups of sensor assemblies are uniformly distributed and embedded in the saline-alkali soil, each group of sensor assemblies comprises a salinity sensor, a humidity sensor and a GPS (global positioning system) positioner, and a wireless signal receiver for receiving transmission signals of the salinity sensor, the humidity sensor and the GPS positioner is arranged in the controller. The controller judges whether the area needs irrigation according to the humidity and salinity signals in the sensor assembly, and the controller controls the motor through the GPS positioner to enable the patrol car to move to the area for irrigation.

Disclosure of Invention

The invention aims to provide an irrigation device to solve the technical problems that the traditional irrigation device cannot repair saline-alkali soil and is easy to cause excessive soil humidity and secondary salinization of soil.

In a first aspect, the present invention provides an irrigation device comprising: the water tank, the water pump and the restoration material jar are provided with feed liquor pipe and drain pipe on the water pump, and the feed liquor pipe and the water tank fluid communication of water pump are provided with the material export on the restoration material jar, and the material export of restoration material jar and the drain pipe fluid communication of water pump.

With reference to the first aspect, the present invention provides a first possible implementation manner of the first aspect, wherein the material outlet of the repair material tank and the liquid outlet pipe of the water pump are both in fluid communication with the mixing pipe, the mixing pipe includes a mixing pipe body, a branch pipe, a side pipe, a terminal pipe and an impeller, the branch pipe is fixedly connected at one axial end of the mixing pipe body, the terminal pipe is detachably connected at the other axial end of the mixing pipe body, the side pipe is fixedly connected at an outer side wall of the mixing pipe body, the branch pipe, the side pipe and the terminal pipe are both in communication with the mixing pipe body, the impeller is rotatably connected in the mixing pipe body, the side pipe is in fluid communication with the material outlet of the repair material tank, and the branch pipe is in fluid communication with the liquid outlet pipe of the water pump.

With reference to the first possible implementation manner of the first aspect, the present invention provides a second possible implementation manner of the first aspect, wherein the impeller includes a bushing, blades and a side through groove, the inner side of the bushing is fixedly connected with a plurality of blades, the plurality of blades are uniformly distributed along the circumferential direction of the bushing, and the side through groove is arranged on the bushing.

With reference to the second possible implementation manner of the first aspect, the present invention provides a third possible implementation manner of the first aspect, wherein a spring is inserted into the mixing tube body, and the spring is located between the bushing and the end tube.

With reference to the third possible implementation manner of the first aspect, the present invention provides a fourth possible implementation manner of the first aspect, wherein the side through groove is disposed along an axial direction of the liner, and a width of the side through groove increases from an end close to the water pump to an end far from the water pump.

In a second aspect, the present invention provides an irrigation system comprising: the irrigation device provided by the first aspect, the collection module, the controller and the water pump are connected with each other.

With reference to the second aspect, the present invention provides a first possible implementation of the second aspect, wherein the substance outlet of the repair substance tank is provided with a control valve, the control valve being connected to the controller.

With reference to the first possible implementation manner of the second aspect, the present invention provides a second possible implementation manner of the second aspect, wherein the acquisition module includes a humidity sensor and a salinity sensor, and the humidity sensor and the salinity sensor are respectively connected with the controller.

With reference to the second aspect, the present invention provides a third possible implementation manner of the second aspect, wherein the humidity sensor is a wireless humidity sensor, the wireless humidity sensor is connected to the controller through wireless communication, the salinity sensor is a wireless salinity sensor, and the wireless salinity sensor is connected to the controller through wireless communication.

With reference to the second aspect, the present invention provides a fourth possible implementation manner of the second aspect, wherein the collecting module and the irrigation device are provided in plurality, and the collecting modules are provided in a one-to-one correspondence with the irrigation devices.

The embodiment of the invention has the following beneficial effects: the water pump is provided with the liquid inlet pipe and the liquid outlet pipe, the liquid inlet pipe of the water pump is in fluid communication with the water tank, the material outlet of the material repairing tank is in fluid communication with the liquid outlet pipe of the water pump, the soil repairing agent is stored in the material repairing tank and is output through the material outlet of the material repairing tank, so that the soil repairing agent is mixed with irrigation water and finally irrigated into saline-alkali soil, the saline-alkali soil is repaired while irrigation is carried out, the salt content of the soil can be reduced, the pH value of the soil is regulated, the soil structure is improved, the irrigation effect is improved, and the plant growth is promoted. Can set up a plurality of irrigation equipments according to the land parcel area to set up the interval between the adjacent irrigation equipments according to the saline and alkaline degree, and then realize targeted irrigation and soil improvement, reach accurate irrigation and improvement saline and alkaline land's purpose. In addition, the material outlet of the repairing material tank is in fluid communication with the liquid outlet pipe of the water pump, and when the liquid outlet pipe of the water pump is used for delivering water, water flow impacts the material outlet of the repairing material tank, so that the soil repairing agent in the repairing material tank is beneficial to mixing with water, the soil repairing agent cannot flow through the water pump, and the water pump can be prevented from being corroded or blocked.

In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the related art, the drawings that are required to be used in the description of the embodiments or the related art will be briefly described, and it is apparent that the drawings in the description below are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

FIG. 1 is a cross-sectional view of an irrigation device provided by an embodiment of the present invention;

FIG. 2 is a cross-sectional view of a mixing tube of an irrigation device according to an embodiment of the present invention;

FIG. 3 is a schematic view of an impeller of an irrigation device according to an embodiment of the present invention;

FIG. 4 is a schematic illustration of an irrigation system provided by an embodiment of the present invention;

fig. 5 is a schematic view of an irrigation device according to an embodiment of the present invention.

Icon: 1-a water tank; 2-a water pump; 3-repairing a material tank; 4-mixing tube; 41-a mixing tube body; 42-branch pipes; 43-side tube; 44-end tube; 45-springs; 46-impeller; 461-bushings; 462—leaf; 463-side through slots; 5-an acquisition module; 51-humidity sensor; 52-salinity sensor; 6-a controller.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Example 1

As shown in fig. 1, an irrigation device provided in an embodiment of the present invention includes: the water tank 1, the water pump 2 and the restoration material jar 3 are provided with feed liquor pipe and drain pipe on the water pump 2, the feed liquor pipe and the water tank 1 fluid communication of water pump 2 are provided with the material export on the restoration material jar 3, the material export and the drain pipe fluid communication of water pump 2 of restoration material jar 3.

Specifically, the upper end of the water tank 1 is provided with a water filling port, and a liquid inlet pipe of the water pump 2 is communicated to the lower end of the water tank 1 to suck out water in the water tank 1. The liquid outlet pipe of the water pump 2 is in fluid communication with the material outlet of the repairing material tank 3, so that when water flows out through the liquid outlet pipe of the water pump 2, the water can be mixed with the soil repairing agent discharged through the material outlet of the repairing material tank 3, and the soil repairing agent and the water can be irrigated into the soil together, thereby realizing the irrigation and improvement of the soil.

If the soil remediation agent is liquid, the material outlet is arranged at the lower end of the remediation material tank 3, so that the liquid soil remediation agent flows out through the material outlet, and the liquid soil remediation agent and water can be mixed; if the soil restoration agent is solid powder, the water flow impacts the material outlet of the restoration material tank 3, so that the solid soil restoration agent in the restoration material tank 3 is discharged through the material outlet, and the solid soil restoration agent and the water are mixed. In addition, if the soil restoration agent is solid, a stirring rod or a spiral conveying impeller can be added in the restoration material tank 3, and the solid soil restoration agent is stirred by driving the stirring rod or the spiral conveying impeller through a motor, so that the solid soil restoration agent is discharged through a material outlet.

The material outlet of the repairing material tank 3 is in fluid communication with the liquid outlet pipe of the water pump 2, and water flows through the water pump 2 and then is mixed with the soil repairing agent and finally irrigates the soil to be irrigated, so that the soil repairing agent or the solution mixed with the soil repairing agent does not flow through the water pump 2, and corrosion or blockage of the water pump 2 can be avoided.

As shown in fig. 2, in the embodiment of the present invention, the material outlet of the repair material tank 3 and the liquid outlet pipe of the water pump 2 are both in fluid communication with the mixing pipe 4, the mixing pipe 4 includes a mixing pipe body 41, a branch pipe 42, a side pipe 43, a tip pipe 44, and an impeller 46, the branch pipe 42 is fixedly connected to one axial end of the mixing pipe body 41, the tip pipe 44 is detachably connected to the other axial end of the mixing pipe body 41, the side pipe 43 is fixedly connected to the outer side wall of the mixing pipe body 41, the branch pipe 42, the side pipe 43, and the tip pipe 44 are all in communication with the mixing pipe body 41, the impeller 46 is rotatably connected within the mixing pipe body 41, the side pipe 43 is in fluid communication with the material outlet of the repair material tank 3, and the branch pipe 42 is in fluid communication with the liquid outlet pipe of the water pump 2. Wherein the pipe diameter of the branch pipe 42 is smaller than that of the mixing pipe body 41, so that the impeller 46 is axially fixed by the branch pipe 42 and the end pipe 44. The water in the water tank 1 flows through the water pump 2, the branch pipe 42 and the mixing pipe body 41 in this order, and is discharged through the end pipe 44, and finally irrigated into the soil. The side pipe 43 is in fluid communication with the material outlet of the repair material tank 3, and the soil remediation agent within the repair material tank 3 may enter the mixing pipe body 41 through the side pipe 43, thereby mixing the soil remediation agent with water in the mixing pipe body 41. When water flows through the mixing pipe body 41, the water flows impact the impeller 46, so that the impeller 46 rotates, and the rotating impeller 46 can accelerate the mixing of the soil restoration agent and water, so that not only can the delamination of the soil restoration agent and water different from the water be avoided, but also the solid powdery soil restoration agent can be prevented from being deposited in the mixing pipe body 41.

As shown in fig. 3, the impeller 46 includes a bushing 461, a plurality of vanes 462 fixedly connected to the inner side of the bushing 461, and side through grooves 463 provided in the bushing 461, wherein the plurality of vanes 462 are uniformly distributed along the circumferential direction of the bushing 461.

The plurality of blades 462 are each inclined such that when the water flows along the axial direction of the mixing tube body 41, the water flows to impinge on the plurality of blades 462, thereby rotating the impeller 46 about the axis of the mixing tube body 41. The orientation and configuration of the vanes 462 may be understood with reference to the configuration of the fan blades. The side through groove 463 on the bushing 461 intermittently communicates with the side pipe 43 when the impeller 46 rotates. When the side through groove 463 is communicated with the side pipe 43, the soil restoration agent in the restoration material tank 3 sequentially enters the mixing pipe main body 41 through the side pipe 43 and the side through groove 463, and under the turbulent flow action of the plurality of blades 462, the full mixing of the soil restoration agent and water is realized. When the lining 461 rotates to the position where the side through groove 463 is dislocated with the side pipe 43, the lining 461 seals the side pipe 43, so that the soil restoration agent is limited to enter the mixing pipe main body 41, and in the rotating process of the lining 461, the side through groove 463 is intermittently communicated with the side pipe 43, so that the soil restoration agent is intermittently introduced into the mixing pipe main body 41, and further, the full mixing of the soil restoration agent and water is facilitated, and the uneven mixing caused by a large amount of soil restoration agent entering the mixing pipe main body 41 is avoided.

A spring 45 is inserted into the mixing tube body 41, the spring 45 being located between the bushing 461 and the tip tube 44. When the water flow hits the leaf 462, the impeller 46 slides in the axial direction of the mixing tube body 41 toward the end away from the branch tube 42 by the water flow, thereby pressing the spring 45 between the bushing 461 and the tip tube 44. When the water pump 2 outputs unstable water pressure, the force of the water flow striking the leaf 462 changes accordingly, and the impact force of the impeller 46 is buffered by the spring 45, so that the impeller 46 is prevented from being damaged by the water flow. In addition, the bush 461 slides in the axial direction of the mixing tube body 41, and the bush 461 scrapes the inner side wall of the mixing tube body 41, so that scale and soil remediation agent deposited in the mixing tube body 41 can be removed.

As shown in fig. 3, the side through groove 463 is provided along the axial direction of the bushing 461, and the width of the side through groove 463 increases from the end close to the water pump 2 to the end far from the water pump 2. As the sleeve 461 slides in the axial direction of the mixing tube main body 41, the width of the side through groove 463 communicating with the side tube 43 is changed, so that the flow rate of the soil restoration agent between the side tube 43 and the side through groove 463 is changed accordingly. When the flow rate of the water increases, the force of the water striking the impeller 46 increases, and the bushing 461 slides along the axial direction of the mixing tube main body 41 toward the end close to the end tube 44, so that the width of the side through groove 463 communicated with the side tube 43 increases, and the flow rate of the soil restoration agent between the side tube 43 and the side through groove 463 increases accordingly, so that the flow rate of the soil restoration agent is automatically increased when the flow rate of the water increases, and the mixing concentration balance of the soil restoration agent and the water is maintained. When the water flow rate decreases, the spring 45 pushes the impeller 46 to slide toward the end far away from the end pipe 44, so that the width of the side through groove 463 communicated with the side pipe 43 is reduced, and the soil restoration agent flow rate between the side pipe 43 and the side through groove 463 is reduced, so that the soil restoration agent flow rate is automatically reduced when the water flow rate decreases. When the inner diameter of the side pipe 43 is equal to or larger than the maximum width of the side through groove 463 to ensure that the side pipe 43 communicates with the side through groove 463, the side through groove 463 is partially blocked by the bushing 461, and the flow rate of the soil remediation agent between the side pipe 43 and the side through groove 463 depends on the width of the side through groove 463.

Example two

As shown in fig. 4, an irrigation system according to an embodiment of the present invention includes: the irrigation device provided by the first embodiment, the collection module 5, the controller 6 and the controller 6 are connected, and the controller 6 is connected with the water pump 2.

Specifically, the collection module 5 is used for collecting the humidity of the soil to be irrigated, and the controller 6 controls the working time length or water flow of the water pump 2 according to the soil humidity, so that quantitative irrigation is realized according to the drought degree of the soil, and the condition that the irrigation water quantity is inconsistent with the soil humidity is avoided. In addition, when the soil humidity reaches the set humidity value, the controller 6 controls the water pump 2 to stop working, so that the water resource waste caused by excessive irrigation can be avoided. The controller 6 can be a PLC controller, and the working time of the water pump 2 is inversely proportional to the measured soil humidity; or when the measured soil humidity is lower than the set humidity value, the PLC controller controls the water pump 2 to start, and when the measured soil humidity is higher than or equal to the set humidity value, the PLC controller controls the water pump 2 to turn off.

As shown in fig. 5, in the embodiment of the present invention, the substance outlet of the repair substance tank 3 is provided with a control valve 31, and the control valve 31 is connected to the controller 6. The opening degree of the control valve 31 can adjust the flow and the opening and closing of a material outlet of the repair material tank 3, the acquisition module 5 is additionally provided with a function of detecting the salinity of soil, and the PLC controller controls the opening and closing and the opening degree of the control valve 31 according to the salinity and the alkalinity of the soil, so that the quantitative supply of the soil repair agent is realized.

The acquisition module 5 comprises a humidity sensor 51 and a salinity sensor 52, and the humidity sensor 51 and the salinity sensor 52 are respectively connected with the controller 6. The humidity sensor 51 is used for detecting the water content in the soil, so that the controller 6 controls whether the water pump 2 irrigates or not according to the water content of the soil; the salinity sensor 52 may detect the saline-alkali degree of the soil by detecting the salt ion content in the soil, and the controller 6 controls the supply amount of the soil restoration agent according to the salt content of the soil. For dry soil, water can be delivered by the water pump 2 to form a solution to be tested in the soil, and the salinity sensor 52 can detect the salinity of the soil by detecting the conductivity of the solution to be tested.

The humidity sensor 51 is a wireless humidity sensor, the wireless humidity sensor is connected with the controller 6 through wireless communication, the salinity sensor 52 is a wireless salinity sensor, and the wireless salinity sensor is connected with the controller 6 through wireless communication. The optional model of the wireless salinity sensor is TPSBR-SEC, and the wireless salinity sensor is used for detecting the salinity content of soil; the optional model of the wireless humidity sensor is NHSF48-WX and is used for detecting the moisture content in the soil; the controller 6 includes a wireless communication module that receives the humidity data of the wireless humidity sensor and the salinity data of the wireless salinity sensor using wireless 232 data communication or wireless 485 data communication.

The collection module 5 and the irrigation equipment all are provided with a plurality of, a plurality of collection module 5 and a plurality of irrigation equipment one-to-one set up, during the use, can set up the interval and the quantity of collection module 5 and irrigation equipment according to the parcel size, soil humidity and soil salinity, when the parcel area is great or soil humidity is lower or soil saline and alkaline degree distributes unevenly, should suitably increase the quantity of collection module 5 and irrigation equipment and reduce the interval to improve the efficiency of soil irrigation and improvement, and then reach purposeful and regional irrigation and improvement, realize the accurate irrigation and the improvement of soil. The acquisition module 5 can also be added with a pH value detection sensor for detecting the pH value of the soil, and the purpose of regulating the pH value of the soil is realized by adding a soil restoration agent for regulating the pH value of the soil into the restoration material tank 3.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. An irrigation system, comprising: acquisition module (5), controller (6) and irrigation equipment, irrigation equipment includes: the water pump comprises a water tank (1), a water pump (2) and a repairing substance tank (3), wherein a liquid inlet pipe and a liquid outlet pipe are arranged on the water pump (2), the liquid inlet pipe of the water pump (2) is in fluid communication with the water tank (1), a substance outlet is arranged on the repairing substance tank (3), and the substance outlet of the repairing substance tank (3) is in fluid communication with the liquid outlet pipe of the water pump (2);

the acquisition module (5) is connected with the controller (6), and the controller (6) is connected with the water pump (2);

the material outlet of the repair material tank (3) and the liquid outlet pipe of the water pump (2) are in fluid communication with a mixing pipe (4), the mixing pipe (4) comprises a mixing pipe main body (41), a branch pipe (42), a side pipe (43), a tail pipe (44) and an impeller (46), the branch pipe (42) is fixedly connected to one axial end of the mixing pipe main body (41), and the tail pipe (44) is detachably connected to the other axial end of the mixing pipe main body (41);

the pipe diameter of the branch pipe (42) is smaller than that of the mixing pipe main body (41);

the side pipe (43) is fixedly connected to the outer side wall of the mixing pipe main body (41), the branch pipe (42), the side pipe (43) and the tail end pipe (44) are communicated with the mixing pipe main body (41), the impeller (46) is rotatably connected in the mixing pipe main body (41), the side pipe (43) is in fluid communication with a material outlet of the repairing material tank (3), and the branch pipe (42) is in fluid communication with a liquid outlet pipe of the water pump (2);

the impeller (46) comprises a lining (461), blades (462) and side through grooves (463), wherein the inner side of the lining (461) is fixedly connected with a plurality of blades (462), the blades (462) are uniformly distributed along the circumferential direction of the lining (461), and the side through grooves (463) are formed in the lining (461);

a spring (45) is inserted into the mixing tube main body (41), and the spring (45) is positioned between the bushing (461) and the tail end tube (44);

the side through groove (463) is arranged along the axial direction of the bushing (461), and increases in width from one end close to the water pump (2) to one end far away from the water pump (2).

2. Irrigation system according to claim 1, wherein the material outlet of the repair material tank (3) is provided with a control valve (31), the control valve (31) being connected to the controller (6).

3. Irrigation system according to claim 2, wherein the acquisition module (5) comprises a humidity sensor (51) and a salinity sensor (52), the humidity sensor (51) and the salinity sensor (52) being connected to the controller (6), respectively.

4. An irrigation system according to claim 3, wherein the humidity sensor (51) is a wireless humidity sensor connected to the controller (6) by wireless communication, and the salinity sensor (52) is a wireless salinity sensor connected to the controller (6) by wireless communication.

5. Irrigation system according to claim 1, wherein the collection module (5) and the irrigation device are each provided in plurality, and wherein a plurality of the collection modules (5) are provided in one-to-one correspondence with a plurality of the irrigation devices.