KR20190028907A - Controll device of supplying nutrient solution and controll method of the same - Google Patents

Abstract

The present invention provides a nutrient solution supply control method capable of precisely controlling and supplying raw water and fertilizer of a nutrient solution when supplying a required amount of nutrient solution for crops from a nutrient solution supplier which is used for cultivation such as water culture or vinyl greenhouse. To achieve the purpose, according to the present invention, the method includes: a first step (S100) of injecting raw water into a mix tank (10); a second step (S200) of enabling a sensor (70) to check the concentration of fertilizer in each fertilizer tank (30); a third step (S300) of mixing each fertilizer with the raw water in the mix tank (10) if the checked concentration is proper; a fourth step (S400) of supplying the nutrient solution mixed with the raw water and each fertilizer in the mix tank (10); and a fifth step (S500) of discharging the supplied nutrient solution to a culture medium through a regional valve (80).

Description

Technical Field [0001] The present invention relates to a nutrient supply control device and a nutrient solution supply control method,

The present invention relates to a nutrient solution supply control device and a nutrient solution supply control method, and more particularly to a nutrient solution supply control device and a nutrient solution supply control method for controlling a nutrient solution used for growing a crop such as a greenhouse or hydroponic cultivation to supply a nutrient solution To a nutrient supply control device and a nutrient solution supply control method.

In general, nutrient solution cultivation is performed by culturing a nutrient solution containing nutrients necessary for the growth of crops (hereinafter abbreviated as "nutrient solution") without using soil, and has been developed to cultivate crops from anywhere regardless of soil And it is widely used because it has the advantage of cultivating crops with high productivity and high quality compared to general land cultivation.

In such a nutrient solution cultivation, a nutrient solution is used in which raw water alone or a nutrient solution prepared by mixing raw water and fertilizer solution in an appropriate ratio is automatically supplied to the crop.

The nutrient solution feeding device can be largely classified into a mixed tank type nutrient solution feeding device and a direct injection type nutrient solution feeding device depending on the feeding method of the fertilizer solution. The mixed tank type nutrient supply system is a system in which a mixed nutrient solution is supplied to the crop by mixing the fertilizer solution and the raw water at a certain ratio in the mixing tank and the direct injection type nutrient solution supply device feeds the appropriate amount of the fertilizer solution directly And the mixture is fed in the tube during feeding and fed to the crop.

In the mixed tank type nutrient supply system of the above-mentioned method, the fertilizer solution and the raw water should be mixed at a certain ratio in the mixing tank.

However, the conventional nutrient feeder is not able to cultivate the nutrient solution in relation to the failure of the nutrient solution cultivation if the fertilizer solution and the raw water are mixed at a certain ratio in the mixing tank, And management of supplying raw water. Accordingly, in recent years, studies have been made to facilitate the maintenance and repair of the nutrient solution supply device in order to increase the service life of the expensive nutrient solution supply device while allowing the nutrient solution and the raw water to be precisely controlled.

Accordingly, the present invention has been proposed in order to overcome the above-mentioned problems, and it is an object of the present invention to provide a nutrient solution feeding apparatus for feeding crops with a nutrient solution, And to provide a nutrient solution supply control device and nutrient solution supply control method for precisely regulating and supplying the fertilizer solution and the raw water.

In order to achieve the above object, a nutrient solution supply control device according to the present invention comprises a plurality of fertilizer tanks (30) for respectively storing a plurality of fertilizer solutions to be a raw material of a nutrient solution, and a sensor A mix tank 10 for storing a nutrient solution in which raw water and a plurality of the fertilizer solutions are mixed and a control unit 70 for controlling the discharge amounts of a plurality of the fertilizer solutions moving from the fertilizer tank 30 to the mix tank 10 And a zone valve 80 for jetting the nutrient liquid from the mix tank 10 to the medium.

The nutrient solution supply control device according to the present invention further comprises a venturi 60 for maintaining a pressure value of each channel constantly when a plurality of the fertilizer solutions are moved to the mix tank 10, And a digital flow meter (40).

In order to achieve the above object, a nutrient solution supply control method according to the present invention includes a first step (S100) in which raw water is supplied to a mix tank (10) (S300) in which the fertilizer solution is mixed with the raw water in the mix tank (10) when the checked fertilizer solution concentration is good, and a third step A fourth step S400 of mixing the raw water and the fertilizer solution in the tank 10 with a nutrient solution containing the nutrient solution, and a fifth step S500 of spraying the nutrient solution to the nutrient solution through the zone valve 80, .

Also, the nutrient solution supply control method according to the present invention is characterized in that, in the second step (S200), when the checked fertilizer solution concentration is not good, the motor valve 50 is operated to adjust the discharge amount of the fertilizer solution, And controlling the concentration of the liquid (S10).

Further, in the nutrient solution supply control method according to the present invention, in step S10, the pressure gauge value of the digital flow meter 40 according to the control of the fertilizer solution concentration of the motor valve 50 is checked, The flow rate of the fertilizer solution is controlled by checking the pressure gauge value of the digital flow meter 40 according to the control of the concentration of the fertilizer solution in the motor valve 50. If the result is not good, And controlling the concentration of the fertilizer solution by regulating the discharge amount of the fertilizer solution by operating the valve (50) again (S20).

According to the present invention, there is an effect of precisely controlling the fertilizer solution and the raw water in the nutrient solution when the nutrient solution is supplied to the crop in an amount required for the crop from the nutrient solution used for growing crops such as vinyl houses and hydroponic cultivation.

1 is a perspective view schematically showing a nutrient supply control device according to an embodiment of the present invention;
2 is a view showing a pipe of a nutrient solution supply control device according to an embodiment of the present invention.
3 is a flowchart showing a flow of a nutrient solution supply control method according to an embodiment of the present invention;
4 is a graph showing a concentration error value (a) of a nutrient solution using a conventional solenoid valve and a concentration error value (b) of a nutrient solution using a motor valve modified according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a perspective view schematically showing a nutrient solution supply apparatus according to an embodiment of the present invention, and Fig. 2 is a view showing a piping of a nutrient solution supply apparatus according to an embodiment of the present invention.

The nutrient solution supply apparatus 100 according to the embodiment of the present invention includes a plurality of fertilizer tanks 30 for storing a plurality of fertilizer solutions to be a raw material of nutrient solution, a sensor 70 for checking the concentration of the plurality of fertilizer solutions, A mix tank 10 for storing a nutrient solution in which raw water and a plurality of fertilizer liquids are mixed and a plurality of motor valves (not shown) for controlling the discharge amount of a plurality of fertilizer liquids moving from the fertilizer tank 30 to the mix tank 10 And a zone valve 80 for ejecting the nutrient solution fed from the mix tank 10 to the medium.

A converter 110 for converting the physical property values of the nutrient solution measured by the sensor 70 into signals and a sub screen 120 for directly displaying the properties of the nutrient solution connected to the converter 110, And a main screen 150 for displaying the properties of the nutrient solution transferred from the converter 110.

The nutrient solution supply device 100 is a device used for cultivating crops using a nutrient solution and is a device for automatically controlling the physical properties of the nutrient solution and supplying the nutrient solutions having the controlled physical properties to the crops. Here, the nutrient solution may be prepared by mixing the raw water and the fertilizer solution, and the property of the nutrient solution measured by the sensor 70 may be displayed on the subscreen 120 and the main screen 150 through the converter 110 have.

The nutrient solution can be prepared by mixing the raw water and the fertilizer solution. The process of discharging the element and the fertilizer solution to the nutrient solution will be briefly described as follows. 2, raw water is provided in a raw water tank (not shown), a fertilizer liquid in a liquid state is provided in the fertilizer tank 30, and raw water and fertilizer liquid can be mixed in the mix tank 10 . A raw water inlet pump is provided at the front end of the raw water tank and a water supply inlet pump is provided at the rear end of the raw water tank to deliver the raw water to the mix tank 10. In addition, the raw water introduced by the raw water intake pump may be introduced into the raw water tank in a state where the impurities are removed through a separate filter. Further, a hydro valve may be separately provided between the water supply inlet pump and the mix tank 10 to control the amount of raw water to be delivered to the mix tank 10.

The fertilizer tank 30 may be provided with one or more fertilizer tanks 31, 32, 33, ... and a fertilizer liquid having different concentrations or concentrations may be provided in the fertilizer tank 30, Can be controlled. A motor valve 50 may be separately provided on the outlet side of the fertilizer tank 30 where the fertilizer liquid is discharged. The fertilizer solution having passed through the motor valve 50 is supplied to the venturi 60 and the digital flow meter 40 And can be introduced into the mix tank 10.

In the mix tank 10, the raw water and the fertilizer solution may be mixed to produce a nutrient solution, and the nutrient solution may be discharged through a separate second filter and through a plurality of zone valves 80. At this time, a sensor 70 for sensing the physical property of the pump, the pressure gauge or the nutrient solution may be provided between the second filter and the zone valve 80. In the present embodiment, the sensor 70 is for measuring the physical properties such as the concentration of the discharged nutrient solution or the operation of the motor 20. The sensor 70 may be provided at a portion where the property value of the nutrient solution in a state of being provided with the crop can be confirmed, The present invention is not limited thereto.

The nutrient solution supply apparatus 100 may include a main screen 150 for displaying the measured physical properties of the nutrient solution with the set physical property values and a sub screen 120 for displaying the measured physical property values. The main screen 150 and the sub screen 120 may display the properties of the nutrient solution, but may use different display devices. For example, the main screen 150 may include a touch screen.

The property values of the nutrient solution may further include EC and pH of the nutrient solution. The main screen 150 and the subscreen 120 display concentrations of nutrients, EC and pH, And pH errors can be checked. The sub screen 120 directly receives and displays the measured concentration of the nutrient solution conveyed through the converter 110 and the EC and the pH and the main screen 150 displays the measured concentration of the nutrient solution delivered from the converter 110 , EC and pH while simultaneously displaying the concentration, EC and pH of the nutrient solution using a touch screen by an operator. The main screen 150 can be used to cross-check the measured concentrations of the nutrient solution, the EC and the pH, the set concentrations, the EC and the pH, together with the measurement of the nutrient solution displayed on the main screen 150 and the sub- Cross-check the concentration, EC, and pH to check for errors. That is, the main screen 150 or the sub-screen 120 may incorrectly display the measured concentration, EC, and pH of the nutrient solution due to malfunction of the display device. At this time, the occupant can immediately check the cross- I can take it.

The nutrient solution supply device 100 may further include a portable sensor capable of measuring the properties of the nutrient solution respectively and a kit box containing one or more tools for detaching and attaching the main screen 150 from the frame 140. The physical properties of the nutrient solution may be varied depending on environmental conditions, crop conditions, etc. At this time, the physical properties of the nutrient solution may be measured through the portable sensor and displayed on the main screen 150 or the subscreen 120 of the nutrient solution supply apparatus 100 This can be confirmed by comparison with the physical properties of the nutrient solution. At this time, by providing the kit box with a portable sensor capable of confirming the physical properties of the nutrient solution, the portable sensor can be easily stored and maintenance and repair of the nutrient solution supply device 100 can be easily performed. In addition, the main screen 150 may be detachably attached to the frame 140, and the kit box may contain one or more tools for detachably attaching the main screen 150.

The nutrient solution supply apparatus 100 may include a frame 140 for housing the main screen 150 and a body part 130 for supporting the frame 140 in the lower part of the frame 140. The body part 130 may include a converter 110 and a sub screen 120. The main screen 150 is accommodated in the frame 120 and can be mounted reversibly detachably.

The nutrient solution supply control device 100 according to the present invention includes a venturi 60 for keeping the pressure value of each channel constant when a plurality of fertilizer liquids are moved to the mix tank 10, And further includes a digital flow meter 40.

Here, the venturi (60) is installed solely between the sensor (70) and the mix tank (10).

In the prior art, a plurality of venturi are provided in the vicinity of the plurality of valves 50, respectively. However, when a plurality of venturi are installed and controlled at the same time as in the conventional method, a pressure deviation occurs.

However, by providing only one venturi 60 between the sensor 70 and the mix tank 10 as in the present invention, it is possible to maintain the pressure of each of the motor valves 51, 52 and 53 constant have.

3 is a flowchart showing the flow of a nutrient solution supply control method according to an embodiment of the present invention.

3, a nutrient solution supply control method according to an embodiment of the present invention includes a first step (S100) in which raw water is supplied (11), a concentration of a fertilizer solution in each fertilizer tank (30) A third step S300 in which the fertilizer solution is mixed with the raw water into the mix tank 10 when the checked fertilizer solution concentration is good, A fourth step (S400) in which irrigation water mixed with the raw water and the fertilizer solution is made, and a fifth step (S500) in which the irrigated nutrient solution is ejected to the medium via the zone valve (80).

First, in the first step S100, raw water contained in a raw water tank (not shown) is received in the mix tank 10.

Next, in the second step (S200), the fertilizer solution concentration of each fertilizer tank 30 is checked. When the fertilizer tank 30 is provided with a liquid fertilizer solution, the sensor 70 checks whether the concentration of the fertilizer liquid is good.

In the third step S300, when the concentration of the fertilizer solution checked by the sensor 70 is good, the raw water and the fertilizer solution are mixed in the mix tank 10.

The fertilizer tank 30 may be provided with one or more fertilizer tanks 31, 32, 33, ..., and a fertilizer liquid having different types or concentrations may be provided in the fertilizer tank 30, And so on. A motor valve 50 may be separately provided on the outlet side of the fertilizer tank 30 where the fertilizer liquid is discharged. The fertilizer solution having passed through the motor valve 50 is supplied to the venturi 60 and the digital flow meter 40 And can be introduced into the mix tank 10.

Next, in the fourth step (S400), the irrigation water mixed with the raw water and the fertilizer solution in the mix tank 10 is made, and in the fifth step (S500), the irrigated nutrient solution is discharged through the zone valve 80 As shown in Fig.

Here, in the mix tank 10, the raw water and the fertilizer solution may be mixed to produce a nutrient solution, and the nutrient solution may be discharged through a separate second filter and through a plurality of zone valves 80.

The method further includes a step (S10) of controlling the concentration of the fertilizer solution by controlling the discharge amount of the fertilizer solution by operating the motor valve (50) when the checked fertilizer solution concentration is not good in the second step (S200). Here, the motor of the motor valve 50 may be a servo motor.

In step S10, the control of the fertilizer solution concentration is performed by controlling the discharge amount of the fertilizer solution by operating the motor valve 50, and the pressure gauge of the digital flow meter 40, which controls the fertilizer solution concentration of the motor valve 50, Value.

At this time, the pressure gauge value of the digital flow meter 40 according to the control of the fertilizer solution concentration of the motor valve 50 is checked, and if it is satisfactory, the third step (S300) If the pressure gauge value of the digital flowmeter 40 is not good by checking the control, the flow returns to step S10 and the motor valve 50 is operated again to control the discharge amount of the fertilizer solution to control the fertilizer solution concentration S20).

4 is a graph showing a concentration error value (a) of a nutrient solution using a conventional solenoid valve and a concentration error value (b) of a nutrient solution using a motor valve modified according to an embodiment of the present invention.

4 (a), in the conventional nutrient solution supply control device, the concentration was controlled using a solenoid valve.

4 is a graph showing a V / V value (a) using a conventional ON / OFF cycle and a V / V value (b) using an ON / OFF cycle changed according to an embodiment of the present invention.

4 (a), the concentration controller is controlled to minimize the deviation, which is the difference between the signal detected and fed back by the concentration detection converter and the output signal of the concentration set value generator which generates the signal corresponding to the concentration value set by the user Signal output by the digital control system. At this time, the method for minimizing the deviation may be implemented with any control technique which is suitable for the control object and can be implemented. Here, the proportional control method is adopted for convenience, and it is a method of determining the adjustment amount in proportion to the deviation.

When the mixing ratio set value generator outputs a signal corresponding to the mixing ratio set by the user and instructs it to the ratio control value, the ratio controller sets the opening amount (0 or 1) to the switch or the multiplier so that the amount of the nutrient solution is inputted by the user, And outputs a signal. The output signal of the duty ratio controller is a pulse-phase signal for each of the adjustments, and the magnitude (0 or 1) and the period of each pulse signal are the same and only the turn-ON period is given differently. Then, the output signal of the switch or multiplier is determined by the product of the output signal of the duty ratio controller and the output signal of the density controller. If the output signal of the duty ratio controller is 0, the adjustment amount, i.e., Is 1, the amount of adjustment, i.e., the amount of liquid, becomes equal to the output signal of the density controller.

As a result, it is possible to manipulate both liquid amounts so that a desired amount of nutrient solution can be introduced into the mixing tank in a desired amount.

However, in FIG. 4 (a), for convenience, only one kind of liquid fertilizer or a proportion of the adjusted amount is shown, but it is generally applicable to a plurality of liquid fertilizers.

Fig. 4 (a) shows a setting signal for controlling the liquid mixing ratio or the liquid mixing ratio in the mixing ratio setting curve of the liquid mixing ratio control function unit.

Here, the height direction is a setting ratio curve, and the horizontal direction is a feeding interval of the nutrient solution.

However, in such a conventional nutrient solution supply control apparatus using a solenoid valve, an open or closed (0 or 1) signal is outputted to a switch or a multiplier so that a nutrient solution amount is inputted by a user at a desired ratio, If the output signal of the rate controller is 0, the amount of adjustment is 0, and if the output signal of the rate controller is 1, the adjustment amount, that is, the amount of liquid becomes equal to the output signal of the density controller, .

However, the nutrient solution supply control device 100 using the servomotor valve 50 according to the present invention using the motor valve 50 stores the best position value of the servomotor valve 50, As shown in Fig. 4 (b), the ON / OFF value gradually converges on the set value. That is, the error range is extremely narrowed.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10: Mix tank
11: Receiving the enemy water
20: Motor
30, 31, 32, 33: fertilizer tank
40, 41, 42, 43: Digital flow meter
50, 51, 52, 53: motor valve
60: Venturi
70: Sensor
80: Section valve
100: nutrient feeder
110: Converter
120: Subscreen
130:
140: frame
150: Main screen
161, 162: Control button

Claims (5)

A plurality of fertilizer tanks (30) for respectively storing a plurality of fertilizer solutions to be a raw material of the nutrient solution,
A sensor (70) for checking the concentration of the plurality of the fertilizer solutions,
A mix tank (10) for storing a nutrient solution in which raw water and a plurality of said fertilizer solutions are mixed,
A plurality of motor valves (50) for controlling a discharge amount of a plurality of the fertilizer liquids moving from the fertilizer tank (30) to the mix tank (10)
And a zone valve (80) for jetting the nutrient solution from the mix tank (10) to the medium. The method according to claim 1,
A venturi (60) for keeping a pressure value of each channel constant when a plurality of the fertilizer liquids are transferred to the mix tank (10)
And a digital flow meter (40) for checking the pressure value of the flow channel. A first step S100 in which raw water is received in the mix tank 10,
A second step S200 in which the sensor 70 checks the concentration of the fertilizer in the respective fertilizer tanks 30,
A third step S300 of mixing the fertilizer solution with the raw water into the mix tank 10 when the checked fertilizer solution concentration is good,
A fourth step (S400) of making irrigation water mixed with the raw water and the fertilizer solution in the mix tank (10)
And a fifth step (S500) in which the irrigated nutrient solution is ejected to the medium via the zone valve (80). The method of claim 3,
In the second step S200,
(S10) controlling the concentration of the fertilizer solution by controlling the discharge amount of the fertilizer solution by operating the motor valve (50) when the checked fertilizer solution concentration is not good. 5. The method of claim 4,
In the step S10,
The pressure gauge value of the digital flow meter 40 according to the control of the concentration of the fertilizer solution in the motor valve 50 is checked, and if it is satisfactory, the third step (S300)
If the value of the pressure gauge of the digital flow meter 40 is checked by the control of the concentration of the fertilizer solution in the motor valve 50 and the operation returns to the step S10 to restart the motor valve 50 (S20) controlling the concentration of the fertilizer solution by adjusting an amount of the fertilizer solution discharged.

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