CN105325278A - Greenhouse water planting cyclic irrigation system and nutrient solution EC value control method - Google Patents
Greenhouse water planting cyclic irrigation system and nutrient solution EC value control method Download PDFInfo
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- CN105325278A CN105325278A CN201510631387.5A CN201510631387A CN105325278A CN 105325278 A CN105325278 A CN 105325278A CN 201510631387 A CN201510631387 A CN 201510631387A CN 105325278 A CN105325278 A CN 105325278A
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G31/00—Soilless cultivation, e.g. hydroponics
- A01G31/02—Special apparatus therefor
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
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Abstract
The invention discloses a greenhouse water planting cyclic irrigation system and a nutrient solution EC value control method. Through arranging a second EC sensor on a water supply pipeline, arranging a first EC sensor on a water outlet main pipeline, arranging a third EC sensor on a backflow pipeline, EC values are uploaded in real time, so a control device can automatically control concentration of a nutrient solution according to relations of the EC values on the three devices in a circulation loop and the preset EC value. The system and the method solve problems in the prior art of very long time delay when the concentration of the nutrient solutions in a water supply device, a fertilizer mixing device, and an irrigation device in the irrigation circulation loop reaches consistent, caused by using the EC value in a certain nutrient solution as the nutrient solution concentration to control. The system and the method ensure rationality and effectiveness of greenhouse water planting nutrient solution self-circulation EC control, and prevent a problem of inaccuracy of nutrient solution concentration control.
Description
Technical field
The present invention relates to a kind of Greenhouse Water Culture cyclic irrigation system and nutrient solution EC value control method, belong to water planting crops nutrient solution control technology field.
Background technology
Industrialized agriculture is because environment facies are to controlled, under identical cultivated area condition, there is the features such as efficient yield, in occupation of more and more consequence in agricultural development, under the background that China per capita cultivated land is few, industrialized agriculture has become the developing direction of China's agricultural modernization, the cultivated area world rankings first of current China industrialized agriculture, the industrialized agriculture being representative with intelligent greenhouse, plastic tunnel, sun glasshouse is fast-developing, and wherein the Integration of Water into Fertilizer is applied also more and more extensive in crop water supply fertilizer process.
In industrialized agriculture, cultivation technique without soil application fundamentally avoids the series of problems that soil continuous cropping causes, and effectively can utilize space, not by the restriction of land area, simultaneously under the guidance of crop water supply, fertilizer expert system, easily be automated control, reach high-quality, energy-conservation, efficient, high yield, non-harmful target.Under nutrient fluid cultivation pattern, by fertigation machine, crop is supplied water, fertilizer, liquid manure is with nutritive solution automatic cycle in water planting groove, according to crop different growth periods to the needs of nutritive element, fertilizer is become the nutrient solution of respective concentration with irrigation water proportioning by fertigation machine in certain proportion in blending tank, by transport pump to water planting groove, finally flow into cistern, nutrient solution is automatic cycle between blending tank, water planting groove, cistern through pipeline and each filter.In water planting groove, crop root part is immersed in nutrient solution, whole nutrition needed for it are absorbed from nutrient solution by root, reliable for ensureing fertilizer supply, under normal circumstances to monitor the control reference frame of electrical conductivity (EC value) as the concentration of nutrient solution of nutrient solution.
Through retrieval, existing fertigation machine or water-fertilizer integral system are only control reference frame using the EC value of blending tank delivery port or water planting groove place crop root as nutrient solution.The patent No. is the Chinese invention of 200910192912.2, discloses a plant growth and detects and nutrient solution control system and control method thereof, and it is by detecting the control of root system of plant EC value realization to nutrient solution concentration.The patent No. is the Chinese invention of 201010586460.9, disclose a kind of automatic irrigation fertilizer distributor apparatus for monitoring working state and monitoring method, it is by monitoring as realizing automatic irrigation fertilizer distributor course of work status monitoring and ratio of nutrient solution provides reference the EC value in mixed fertile tank.The patent No. is the Chinese invention of 201310374592.9, discloses a kind of many irrigated areas automatic irrigation fertilizer distributor control appliance, and it controls reference frame by being provided with EC value sensor on fertilizer mixing pipeline as nutrient solution.Under above-mentioned water planting pattern, index using EC value as reaction nutrient solution concentration, nutrient solution is be mixed to form with water in blending tank at first, afterwards by transport pump to water planting groove, final arrival cistern, start afterwards at blending tank, water planting groove, automatic cycle between cistern, inhale in fertile process, blending tank will inhale fertile mixing by pipeline from mother liquor tank from the water in cistern and fat absorption device, under normal circumstances, the EC value of blending tank Middle nutrition liquid, nutrient solution EC value in water planting groove, the EC value of the nutrient solution in cistern presents change from high to low, Crop nutrient solution carries out in water planting groove, only control foundation using the EC value of blending tank as fertilising, nutrient solution concentration can be caused to control coarse problem, and the EC value of blending tank Middle nutrition liquid, nutrient solution EC value in water planting groove, the EC value three of the nutrient solution in cistern is reaching in consistent process, if water planting groove is away from blending tank, nutrient solution EC value in water planting groove, stickiness when the EC value of the nutrient solution in cistern and the EC value of blending tank exist long, inhomogeneities.If therefore only control foundation using the EC value of blending tank as fertilising, accurate fertilizer can not be reached, the core of the Integration of Water into Fertilizer is for need to carry out Precision Irrigation and fertilising according to plant growth, according to crop needs, realize accurately controlling nutrient solution concentration, nutrient solution mixes is the Focal point and difficult point problem in this field.
Summary of the invention
Goal of the invention: the EC value only relying on certain nutrient solution in liquid manure loop (mixed tank place, water planting groove place or cistern place) for existing hydroponic system controls according to as nutrient solution concentration and causes the problem of the EC value instability in whole cyclic irrigation system, proposes a kind of Greenhouse Water Culture cyclic irrigation system and nutrient solution EC value control method
,nutrient solution EC value precise control rate, mixture homogeneity can be improved.
Technical scheme: in order to achieve the above object, Greenhouse Water Culture cyclic irrigation system provided by the invention, comprising: described water supply installation is communicated with by supply channel with described Fertilizer mixer; Described fertilizer device is communicated with by fertilizer supplying pipeline with described Fertilizer mixer; Described irrigation rig one end is communicated with described Fertilizer mixer by water outlet main pipe road, and the other end is communicated with water supply installation by return line, is formed and irrigates closed circuit; Described water supply installation is provided with the 2nd EC sensor, described Fertilizer mixer is provided with an EC sensor, described irrigation rig is provided with the 3rd EC sensor, a described EC sensor, the 2nd EC sensor, the 3rd EC sensor are electrically connected with control device respectively.
Wherein, described water supply installation comprises: cistern and be arranged on the moisturizing magnetic valve of water inlet; Supply channel between described water supply installation and described Fertilizer mixer is disposed with self priming pump and fluid level control valve, described self priming pump is electrically connected with described control device.
Wherein, described fertilizer device comprises mother liquor tank, the fertilizer supplying pipeline between described fertilizer device and described Fertilizer mixer is disposed with filter, joins fertile magnetic valve and fat absorption device; Describedly join fertile magnetic valve and be electrically connected with described control device.
Wherein, described Fertilizer mixer comprises blending tank, is provided with float switch in described blending tank, and described float switch is for controlling the water level in blending tank; Described blending tank is also provided with booster pump, and described booster pump is connected with described water outlet main pipe road, and described booster pump is electrically connected with described control device; Described water outlet main pipe road is divided into three branch roads, and the first branch road is connected with described irrigation rig; Second branch road is provided with pressure electromagnetic valve for adjusting, described pressure electromagnetic valve for adjusting is electrically connected with described control device; 3rd branch road is connected with described fat absorption device.
Present invention also offers a kind of nutrient solution EC value control method, comprise step:
The EC value detected is reported control device by an EC sensor in real time that be arranged between Fertilizer mixer and irrigation rig on water outlet main pipe road;
The 2nd EC value detected is reported control device by the 2nd EC sensor in real time that be arranged between water supply installation and Fertilizer mixer on supply channel;
The 3rd EC value detected is reported control device by the 3rd EC sensor in real time that be arranged between irrigation rig and water supply installation on return line;
A described EC value, the 2nd EC value, the 3rd EC value and the EC value that presets compare by described control device respectively, if an EC value, the 2nd EC value, the 3rd EC value three and the relative error of EC value that presets are all lower than the error floor preset, then open and described fertilizer device joins fertile magnetic valve to supplementary fertilizer in described Fertilizer mixer; Otherwise closedown is joined fertile magnetic valve and is terminated supplementary fertilizer.
Wherein, the error floor preset described in is-5%.
Beneficial effect: water planting cyclic irrigation system of the present invention and water nutrition liquid EC value control method, effectively can improve nutrient solution EC mixture homogeneity, control accuracy, reduce the waste of fertilizer, reach precision fertilizing, because the method and system are with the EC value of blending tank place monitoring, the EC value at cistern place, EC value three indexs at cistern place compare with the EC value of setting as with reference to foundation simultaneously, can guarantee that nutrient solution EC monitors reliable, for nutrient solution EC accurately controls to provide reliable basis, thus avoid fertigation machine course of work Middle nutrition liquid uneven concentration, control coarse problem, fertilizer is economized in realization.
Accompanying drawing explanation
Fig. 1 is the structural representation of water planting cyclic irrigation system of the present invention;
In figure: 1 the one EC sensor, 2 the 2nd EC sensors, 3 the 3rd EC sensors, 4 control device, 5 fat absorption devices, 6 join fertile magnetic valve, 7 filters, 8 mother liquor tanks, 9 self priming pumps, 10 cisterns, 11 moisturizing magnetic valves, 12 fluid level control valves, 13 float switches, 14 blending tanks, 15 booster pumps, 16 pressure electromagnetic valve for adjustings, 17 water planting grooves, 18 way solenoid valves.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Water planting cyclic irrigation system in Fig. 1 comprises: water supply installation, fertilizer device, Fertilizer mixer, irrigation rig and control device 4 and accordingly pipeline and circuit; Water supply installation is communicated with by supply channel with Fertilizer mixer; Fertilizer device is communicated with by fertilizer supplying pipeline with Fertilizer mixer; Irrigation rig one end is communicated with Fertilizer mixer by water outlet main pipe road, and the other end is communicated with water supply installation by return line, is formed and irrigates closed circuit; Control device 4 is electrically connected with water supply installation, fertilizer device, Fertilizer mixer, irrigation rig respectively, receives Detection Information and sending controling instruction.
Water supply installation comprises cistern 10 and is arranged on the moisturizing magnetic valve 11 of cistern 10 water inlet; Connecting pipeline between water supply installation and Fertilizer mixer is disposed with self priming pump 9 and fluid level control valve 12, fluid level control valve 12 is connected with the float switch 13 arranged in blending tank 14, and self priming pump 9 is electrically connected with control device 4; The supply channel of water supply installation and Fertilizer mixer is also provided with the 2nd EC sensor the 2, two EC sensor 2 be electrically connected with control device 4.
Fertilizer device comprises mother liquor tank 8, the connecting pipeline between fertilizer device and Fertilizer mixer is disposed with filter 7, joins fertile magnetic valve 6 and fat absorption device 5, and fat absorption device 5 adopts conventional venturi fat absorption device; Join fertile magnetic valve 6 to be electrically connected with control device 4.
Fertilizer mixer comprises blending tank 14, is provided with float switch 13 in blending tank 14, and float switch 13 is for controlling the opening and closing of fluid level control valve 12; Blending tank 14 is also provided with booster pump 15, and booster pump 15 is connected with water outlet main pipe road, and water outlet main pipe road is divided into three branch roads, and the first branch road is fertigation loop, is connected with irrigation rig, for supplying nutrient solution to production area; Second branch road is loop of voltage regulation, this branch road is provided with pressure electromagnetic valve for adjusting 16, and pressure electromagnetic valve for adjusting 16 is electrically connected with control device 4, is used for the pressure of regulating system, in case cause system pressure because of the change of flow in main line cross great fluctuation process; Fertile branch road joined by 3rd branch road, is connected with fat absorption device 5, fat absorption device 5 normally can be worked and be delivered in blending tank 14 by the fertilizer of mother liquor tank 8; Booster pump 15 and pressure electromagnetic valve for adjusting 16 are electrically connected with control device respectively; Water outlet main pipe road between Fertilizer mixer and irrigation rig is also provided with EC sensor the 1, an one EC sensor 1 to be electrically connected with control device 4.
Irrigation rig comprises water planting groove 17 and irrigates branch road, irrigate on branch road and be provided with a way solenoid valve 18, return line between irrigation rig and water supply installation is also provided with the 3rd EC sensor the 3, three EC sensor 3, a way solenoid valve 18 is electrically connected with control device 4 respectively.Production area is divided into multiple irrigated area by this irrigation rig, the fertigation branch road in each irrigated area is provided with a way solenoid valve 18, each branch road can be controlled separately, when crop needs fertigation, open the controlling brancher magnetic valve 18 on this branch road, reduce system energy consumption and improve system availability, thus reaching the object of high-efficient irrigation fertilising.
Utilize this Greenhouse Water Culture nutrient solution EC value when control cyclic irrigation system is irrigated, control device 4 can adopt Programmable Logic Controller or single-chip microcomputer, in the following manner water supply installation, fertilizer device, Fertilizer mixer, irrigation rig are controlled, carry out cyclic irrigation:
(1) to the setting of EC value in advance: control device 4 is connected with computer, pre-setting EC value by program is 2500 μ s, this EC value is theoretical value, that is: for the upper limit of the EC value at water replanishing device, Fertilizer mixer, irrigation rig place, when the EC value of three's part is more close to this higher limit, the nutrient solution concentration of irrigating in closed circuit controls better, therefore presets the EC value of three's part and the error floor of above-mentioned EC theoretical value is-5%, to reach good control effects simultaneously.
(2) to the monitoring for water replanishing device: float switch 13 exports water level signal to control device 4; Self priming pump 9 pairs of Fertilizer mixers that water level outputs control signals to water supply installation lower than lower time limiting controller 4 supply water; Reach then self priming pump 9 stopping water supply in limited time; In 2nd EC sensor 2 pairs cistern 10 EC value carry out Real-Time Monitoring and report control device 4.
(3) to the monitoring of Fertilizer mixer: the EC value of an EC sensor 1 pair of blending tank 14 carries out Real-Time Monitoring, and reports control device 4.
(4) monitoring of irrigation rig: the nutrient solution in blending tank 14 pumps into water outlet main pipe road by booster pump 15, control device 4 outputs control signals to a way solenoid valve 18 in certain filling district thus controls the filling of corresponding filling district; EC value in 3rd EC sensor 3 pairs water planting groove 17 carries out Real-Time Monitoring, and reports control device 4.
(5) to the monitoring of fertilizer device: the EC value of monitoring is uploaded to control device 4 by an EC sensor 1, the 2nd EC sensor 2, the 3rd EC sensor 3 respectively, the EC value that each sensor detects by control device 4 and the EC value preset compare, if an EC value, the 2nd EC sensor 2 that an EC sensor 1 detects detect the 2nd EC value, the 3rd EC sensor 3 the 3rd EC value detected and the EC value relative error that presets in control device 4 within-5%, fertile magnetic valve 6 end suction fertilizer is joined in control device 4 closedown; Otherwise control device 4 is opened and is joined fertile magnetic valve 6, and fat absorption device 5 inhales fertilizer from mother liquor tank 8.
Particularly, this water planting cyclic irrigation system utilize three EC Sensor monitorings to EC value carry out control and join fertile magnetic valve 6 and can open and close, according to crop fertilization control strategy, the EC value preset at control device 4 is 2500 μ s, cycle water is sucked rich water blending tank 14 through filter by self priming pump 9 by cistern 10, nutrient solution in blending tank 14 pumps into water outlet main pipe road by booster pump 15, at cistern 10, blending tank 14, in the closed circuit that water planting groove 17 is formed, the EC value of nutrient solution need keep relative stability, the absorption to fertilizer of crop in water planting groove 17, water planting groove 17 nutrient solution EC value can reduce, the EC value that blending tank 14 place the one EC sensor 1 is monitored is 2350 μ s, the EC value that water planting groove 17 place the 3rd EC sensor 3 is monitored is 2300 μ s, the EC value that cistern 10 place the 2nd EC sensor 2 is monitored is 2280 μ s, the data that EC sensor is uploaded by control device 4 compare with the EC value preset in control device 4 respectively, can show that an EC sensor 1 with the relative error of the EC value preset is: (2350-2500)/2500=-6%, similarly, 2nd EC sensor 2, the relative error of the EC value preset in the 3rd EC sensor 3 and control device 4 is respectively-8%,-8.8%, relative error is all lower than error floor-5%, control device 4 controls to join fertile magnetic valve 6 and opens, fat absorption device 5 inhales fertilizer from mother liquor tank 8.Run a period of time, the EC value that blending tank 14 place the one EC sensor 1 is monitored is 2490 μ s, the EC value that water planting groove 17 place the 3rd EC sensor 3 is monitored is 2450 μ s, the EC value that cistern 10 place the 2nd EC sensor 2 is monitored is 2400 μ s, the data that EC sensor is uploaded by control device 4 compare with the EC value preset in control device 4 respectively, can show that an EC sensor 1 with the relative error of the EC value preset is: (2490-2500)/2500=-0.4%, similarly, 2nd EC sensor 2, the relative error of the EC value preset in the 3rd EC sensor 3 and control device 4 is respectively-4%,-2%, all higher than-5%, the fertile magnetic valve 6 of joining that this timed unit 4 controls cuts out, fat absorption device 5 is not inhaled fertile from mother liquor tank 8.
Claims (7)
1. a Greenhouse Water Culture cyclic irrigation system, comprising: water supply installation, fertilizer device, Fertilizer mixer, irrigation rig and control device; Described water supply installation is communicated with by supply channel with described Fertilizer mixer; Described fertilizer device is communicated with by fertilizer supplying pipeline with described Fertilizer mixer; Described irrigation rig one end is communicated with described Fertilizer mixer by water outlet main pipe road, and the other end is communicated with water supply installation by return line, is formed and irrigates closed circuit; It is characterized in that, described supply channel is provided with the 2nd EC sensor, described water outlet main pipe road is provided with an EC sensor, described return line is provided with the 3rd EC sensor, a described EC sensor, the 2nd EC sensor, the 3rd EC sensor are electrically connected with control device respectively.
2. Greenhouse Water Culture cyclic irrigation system according to claim 1, it is characterized in that, described water supply installation comprises: cistern and be arranged on the moisturizing magnetic valve of water inlet; Supply channel between described water supply installation and described Fertilizer mixer is disposed with self priming pump and fluid level control valve, described self priming pump is electrically connected with described control device.
3. Greenhouse Water Culture cyclic irrigation system according to claim 1, is characterized in that, described fertilizer device comprises mother liquor tank, the fertilizer supplying pipeline between described fertilizer device and described Fertilizer mixer is disposed with filter, joins fertile magnetic valve and fat absorption device; Describedly join fertile magnetic valve and be electrically connected with described control device.
4. Greenhouse Water Culture cyclic irrigation system according to claim 1, it is characterized in that, described Fertilizer mixer comprises blending tank, is provided with float switch in described blending tank, and described float switch is for controlling the water level in blending tank; Described blending tank is also provided with booster pump, and described booster pump is connected with described water outlet main pipe road, and described booster pump is electrically connected with described control device; Described water outlet main pipe road is divided into three branch roads, and the first branch road is connected with described irrigation rig; Second branch road is provided with pressure electromagnetic valve for adjusting, described pressure electromagnetic valve for adjusting is electrically connected with described control device; 3rd branch road is connected with described fat absorption device.
5. Greenhouse Water Culture cyclic irrigation system according to claim 1, is characterized in that, described control device is Programmable Logic Controller or single-chip microcomputer.
6. a nutrient solution EC value control method, is characterized in that, comprise step:
The EC value detected is reported control device by an EC sensor in real time that be arranged between Fertilizer mixer and irrigation rig on water outlet main pipe road;
The 2nd EC value detected is reported control device by the 2nd EC sensor in real time that be arranged between water supply installation and Fertilizer mixer on supply channel;
The 3rd EC value detected is reported control device by the 3rd EC sensor in real time that be arranged between irrigation rig and water supply installation on return line;
A described EC value, the 2nd EC value, the 3rd EC value and the EC value that presets compare by described control device respectively, if an EC value, the 2nd EC value, the 3rd EC value three and the relative error of EC value that presets are all lower than the error floor preset, then open and described fertilizer device joins fertile magnetic valve to supplementary fertilizer in described Fertilizer mixer; Otherwise closedown is joined fertile magnetic valve and is terminated supplementary fertilizer.
7. nutrient solution EC value control method according to claim 6, is characterized in that, described in the error floor that presets be-5%.
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| JP2018033333A (en) * | 2016-08-30 | 2018-03-08 | 株式会社最上川環境技術研究所 | Liquid supply device |
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