KR102454556B1 - Eco-friendly Nutritional Solution Supply device with micro-bubbles - Google Patents

Abstract

In a circulating nutrient solution supplying machine that reprocesses and uses waste nutrient solution supplied to crops, it sterilizes waste nutrient solution using hydroxyl groups (OH-radical) generated when microbubbles having a diameter of 50 μm to 100 μm or less are generated. We propose an eco-friendly circulating nutrient solution supplier with microbubbles that can be processed so that it can be reused by sterilizing the waste nutrient solution through OH-radical generated when microbubbles are generated, including the microbubble generator for processing. characterized in that

Description

Eco-friendly Nutritional Solution Supply device with micro-bubbles

The present invention relates to a nutrient solution supply device, and more particularly, to an eco-friendly circulation type nutrient solution supply device capable of sterilizing and recycling waste nutrient solution through microbubbles.

Explosive population growth due to rapid industrialization is causing serious adverse effects on the natural ecosystem, and in the process of pursuing more harvest in facilities such as plastic houses, long-term fertilizer use and excessive use lead to a sharp drop in soil productivity, deterioration of agricultural products, etc. It causes side effects, especially in rivers and groundwater, and causes serious environmental destruction such as acidification of soil.

In Korea, the nutrient cultivation method has been applied as a way to overcome these side effects, and although it has been a short period so far, the increase in cultivation area, diversification of crops, and introduction of a hydroponics system has been achieved through active national support and investment to improve the agricultural structure. and facility modernization.

In general, nutrient solution cultivation is also referred to as hydroponics, and it is a scientific farming technique that supplies a culture solution containing all the nutrients necessary for plant growth to cultivate various crops, and is intended to grow plants regardless of soil.

Nutrient solution cultivation can prevent pests and diseases of various crops, and it can be said that it is an agricultural method that can produce pollution-free plants through clean cultivation without pesticides.

The nutrient solution supplier, which is essential for nutrient solution cultivation, divides the cultivation area into a number of zones, adjusts the concentration of the nutrient solution according to the electrical conductivity (EC) and acidity (pH) input by the user for each zone, and mixes the mixed nutrient solution into the zone. It is defined as a device that supplies

1 is a schematic diagram of a conventional nutrient solution supplier.

Referring to FIG. 1 , a conventional nutrient solution supplier supplies and mixes a material solution from a plurality of material solution storage units 20 in which various types of material solutions are stored to a mixer 10 through a supply pipe. At this time, the mixer 10 is formed in a cylindrical shape and has a predetermined interval along the circumferential direction on its outer periphery, and the connecting portion 30a of the supply pipe 30 is inclinedly connected.

Through this, each material liquid discharged through the connection part 30a of the supply pipe was mixed while rotating along the inner periphery of the mixer.

On the other hand, nutrient solution cultivation or hydroponic cultivation can be divided into a non-circulating type and a circulating type depending on the method of supplying the nutrient solution.

2 is a view showing a conventional circulating nutrient solution supply.

Referring to FIG. 2 , the nutrient solution supplier adjusts the concentration of the nutrient solution according to the electrical conductivity (EC) and acidity (pH) input by the user and mixes it. In particular, the electrical conductivity sensor and acidity sensor mounted on the conventional nutrient solution supply device Since it is very expensive, when the nutrient solution adheres to the sensor, the lifespan of the sensor decreases rapidly, thereby shortening the replacement cycle of the sensor.

Compared to soil cultivation, nutrient solution cultivation has fewer soil and nutrient disturbances and can produce good crops. It spreads and causes great damage. In addition, waste nutrient solution from hydroponics and nutrient solution cultivation facilities is classified as industrial wastewater under the Water Environment Conservation Act and is regulated as an emission control item (T-N 60mg/L or less, T-P 8mg/L or less), so it is an environmentally friendly waste nutrient solution reprocessing technology development is urgently needed.

That is, in the circulating supply method, it is important to efficiently use the nutrients remaining in the waste nutrient solution discharged after use and to keep the composition of the nutrient solution effective for the growth of various crops constant, as well as to prevent the nutrient solution from being contaminated with pathogenic bacteria. It is important to manage it so that it does not become infected.

There is a heat treatment method as a conventional nutrient solution reprocessing method. Since the nutrient solution is heated up to 70°C, the temperature of the nutrient solution must be lowered to 25°C or less for reuse, and it has disadvantages such as having to mix a high-temperature and low-temperature nutrient solution. have.

In addition, the UV treatment method has a disadvantage in that the sterilization power is lowered to treat the waste nutrient solution with high turbidity.

In addition, the ozone treatment method requires a lot of equipment cost because each process design, such as the raw material air manufacturing process, ozone generation process, and ozone reaction process, is required, and unreacted ozone emitted from the ozone reaction process is absorbed into the lungs. It can have very serious effects on the human body, such as causing respiratory problems.

US 10-2019-0115500 A

The present invention has been proposed to solve the above technical problems, and provides an eco-friendly circulating nutrient solution supplier to which microbubbles are applied to sterilize waste nutrient solution using hydroxyl groups (OH-radical) generated when microbubbles are generated. do.

According to an embodiment of the present invention for solving the above problems, in the circulating nutrient solution supplying device that reprocesses and uses the used waste nutrient solution supplied to crops, when generating microbubbles having a diameter of 50 μm to 100 μm or less Provided is an eco-friendly circulation type nutrient solution supplier to which microbubbles are applied including a microbubble generator that sterilizes waste nutrient solution using the generated hydroxyl group (OH-radical).

In addition, the microbubble generating unit included in the present invention is characterized in that it generates microbubbles with an orifice nozzle while reducing energy consumption by self-suctioning air using a venturi nozzle.

In addition, in the present invention, the electrical conductivity sensor for detecting the electrical conductivity of the nutrient solution, the electrical conductivity sensor and the acidity sensor for detecting the acidity (pH) of the nutrient solution and disposed at a predetermined separation distance using the cleaning solution It characterized in that it further comprises a sensor automatic cleaning unit for washing.

In addition, the sensor automatic washing unit included in the present invention includes an internal space in which an electrical conductivity sensor and an acidity sensor are disposed, a first input valve for selectively supplying a nutrient solution mixed in the internal space, and selectively supplying a washing solution to the internal space a second input valve, a first output valve for selectively outputting the nutrient solution in the internal space, a second output valve for selectively outputting the washing solution in the internal space, and an air component for spraying air at a predetermined pressure into the internal space It characterized in that it comprises a control unit for sequentially controlling the operation of the master and the first and second input valves, the first and second output valves, and the air injection unit according to the setting data.

In addition, the sensor automatic cleaning unit included in the present invention further includes an internal camera for photographing the fixed state of the electrical conductivity sensor and the acidity sensor, and the control unit detects the fixed state of the electrical conductivity sensor and the acidity sensor based on the photographing data of the internal camera. After detection, it is characterized in that the ethanol concentration of the washing solution and the supply pressure of the washing solution are automatically adjusted according to the fixed state.

In addition, the control unit included in the present invention detects the fixed state of the electrical conductivity sensor and the acidity sensor based on the photographing data of the internal camera, and automatically adjusts the ethanol concentration of the washing solution and the supply pressure and temperature of the washing solution according to the fixed state. characterized in that

The eco-friendly circulating nutrient solution supplier according to an embodiment of the present invention can sterilize the waste nutrient solution through OH-radicals generated when microbubbles are generated so that it can be reused. That is, since the microbubble generator can be mounted on a mixing tank, a waste nutrient solution collection tank, etc. to reprocess the waste nutrient solution at low cost, there is an advantage in that environmental pollution can be reduced.

1 is a schematic view of a conventional nutrient solution supplier
Figure 2 is a view showing a conventional circulating nutrient solution supply
3 is a conceptual diagram of an eco-friendly circulation type nutrient solution supplier to which microbubbles are applied according to an embodiment of the present invention;
4 is a block diagram of a nutrient solution supplier according to an embodiment of the present invention;
5 is an exemplary view of a microbubble generator;
5A is an exemplary view of an orifice nozzle;
6 is a detailed block diagram of the sensor automatic cleaning unit of the nutrient solution supply unit of FIG.
7 is a plan view of the sensor automatic cleaning unit of FIG. 6
8 is a front view of the sensor automatic cleaning unit of FIG. 6

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings in order to describe in detail enough that a person of ordinary skill in the art to which the present invention pertains can easily implement the technical idea of the present invention.

3 is a conceptual diagram of an eco-friendly circulation type nutrient solution supplier to which microbubbles are applied according to an embodiment of the present invention.

An eco-friendly circulating nutrient solution supplier is defined as a circulating nutrient solution feeder that reprocesses and uses the used waste nutrient solution supplied to crops.

Referring to FIG. 3 , the eco-friendly circulating nutrient solution supplier includes a raw water tank (1), a nutrient solution tank (2), a first mixing tank (3-1), a second mixing tank (3-2), and a first sensor measuring device (4). -1), second sensor measuring device (4-2), farm crops (5), waste nutrient solution recovery tank (6), waste nutrient solution collection tank (7), waste nutrient solution sterilizer (8), waste nutrient solution storage tank (9) ) is included.

An electrical conductivity sensor, an acidity (pH) sensor, and an automatic sensor cleaning unit are provided in the first mixing tank 3-1 and the second mixing tank 3-2, respectively. The electrical conductivity sensor detects the electrical conductivity of the nutrient solution, and the acidity sensor detects the acidity (pH) of the nutrient solution. A detailed description thereof will be provided later.

The first mixing tank 3-1 is a place for mixing the nutrient solution used for the first time, and a nutrient solution is prepared by mixing the water in the raw water tank 1 and the nutrient solution in the plurality of nutrient solution tanks 2 at a preset ratio. At this time, the concentration of the nutrient solution may be automatically adjusted with reference to the data values sensed by the electrical conductivity sensor and the acidity (pH) sensor provided in the first mixing tank 3-1.

The second mixing tank 3-2 mixes the sterilized waste nutrient solution, water from the raw water tank 1, and the nutrient solution from the plurality of nutrient solution tanks 2 at a preset ratio to prepare a nutrient solution. At this time, the concentration of the nutrient solution may be automatically adjusted with reference to the data values detected by the electrical conductivity sensor and the pH sensor provided in the second mixing tank 3-2.

For reference, the first data value detected by the electrical conductivity sensor and the acidity (pH) sensor provided in the first mixing tank 3-1, and the electrical conductivity sensor and the acidity provided in the second mixing tank 3-2 The second data value sensed by the (pH) sensor may be exchanged for reference.

That is, the mixing ratio of the second mixing tank 3-2 may be adjusted with reference to the first data value, that is, the mixing ratio of the first mixing tank 3-1 may be adjusted with reference to the second data value. can be The order of referring to the first and second data values may be automatically adjusted according to the time order in which the nutrient solution is mixed in each mixing tank.

Although not shown in the drawings, a third mixing tank for mixing the nutrient solution supplied from the first mixing tank 3-1 and the nutrient solution supplied from the second mixing tank 3-2 may be additionally provided. The mixing tank may be provided with an electrical conductivity sensor, an acidity (pH) sensor, and an automatic sensor cleaning unit. The third data value sensed by the electrical conductivity sensor and the pH sensor provided in the third mixing tank are fed back to the first mixing tank 3-1 and the second mixing tank 3-2, and in each mixing tank It can be referred to to automatically adjust the mixing ratio.

On the other hand, the nutrient solution is supplied to the agricultural crops (5) and used, and then becomes a waste nutrient solution and is collected in the waste nutrient solution recovery tank (6).

The waste nutrient solution in the waste nutrient solution recovery tank 6 goes through a process of natural purification while staying in the waste nutrient solution collection tank 7 for a certain period of time. That is, the sludge that has settled in the lower part of the waste nutrient solution collection tank 7 is separately discharged and treated. At this time, the waste nutrient solution collection tank 7 is provided with a filter, so that the suspended matter can be removed more quickly.

The waste nutrient solution naturally purified in the waste nutrient solution collection tank 7 is delivered to the waste nutrient solution sterilizer 8, which generates microbubbles that generate microbubbles having a diameter of 50 μm to 100 μm or less. supplements are provided.

That is, the microbubble generating unit performs an operation of sterilizing the waste nutrient solution by using a hydroxyl group (OH-radical) generated when generating microbubbles having a diameter of 50 μm to 100 μm or less. The sterilized waste nutrient solution is stored in the waste nutrient solution storage tank 9 and is supplied to the second mixing tank 3-2 for recycling.

For reference, the waste nutrient solution sterilization device 8 provided with the microbubble generator may be built in the second mixing tank 3-2 and sterilize simultaneously with the waste nutrient solution mixing.

4 is a block diagram of a nutrient solution supply device according to an embodiment of the present invention.

Referring to FIG. 4 , the eco-friendly circulating nutrient solution supplier includes a waste nutrient solution sterilizer 8 , an electrical conductivity sensor 100 , an acidity sensor 200 , and an automatic sensor cleaning unit 300 .

The waste nutrient solution sterilizer 8 includes a microbubble generator, and the microbubble generator uses a venturi nozzle to suck air by itself, thereby reducing energy consumption and generating microbubbles with an orifice nozzle.

The electrical conductivity sensor 100 detects the electrical conductivity of the nutrient solution, and the acidity sensor 200 detects the acidity (pH) of the nutrient solution while being spaced apart from the electrical conductivity sensor 100 at a predetermined distance.

Electrical conductivity (EC) is the reciprocal of the electrical resistance between electrodes when electrodes with a cross-sectional area of 1 cm2 are 1 cm apart. Although the unit is mho, the electrical conductivity (EC) of the culture medium tends to use mS/cm = dS/m for convenience. The more ions dissolved in the culture medium, the easier it is to conduct electricity. Therefore, a high electrical conductivity (EC) means a large amount of ions and a strong nutrient concentration.

The total concentration of ions dissolved in the nutrient solution can be known through electrical conductivity (EC), but the concentration of individual ions cannot be known. However, since it takes a lot of time and money to figure out the composition of each ion, electrical conductivity (EC) is used as a representative indicator to find out the overall concentration of the nutrient solution.

In the nutrient solution, not only the amount of nutrients, that is, the concentration, but also the hydrogen ion concentration (acidity, pH) is an important factor. Soil becomes acidic, neutral, or alkaline depending on the parent material and climate. This is closely related to the productivity of the soil. If the acidity (pH) is not well suited to the crop to be planted, the growth of the crop is delayed.

Nutrients supplied by hydroponics are also important, but the plants should absorb nutrients well when the acidity is maintained in an appropriate range for the plants. Therefore, it is very important to check that the acidity (pH) is in an appropriate range when preparing the nutrient solution.

Most plants grow well at pH 5-7. Outside this range, nutrients cannot be absorbed, that is, the equilibrium of the chemical reaction shifts, reducing the number of nutrients in the form that can be absorbed.

The solubility of iron, manganese, and boron decreases as the acidity increases and absorption is inhibited. To lower the acidity (pH), use acidic substances such as phosphoric acid, hydrochloric acid, sulfuric acid, and nitric acid. Conversely, to increase the acidity (pH), use alkaline substances such as sodium hydroxide and potassium hydroxide.

Since acidity (pH) changes as plants absorb nutrients, and plant nutrient absorption is affected by temperature, the tendency to change pH (pH) also changes when the temperature changes. Also, the sensing value of the sensor may change according to the temperature.

In particular, in the present invention, the sensor automatic cleaning unit 300 automatically cleans the electrical conductivity sensor 100 and the acidity sensor 200 using a cleaning solution, thereby reducing the replacement cycle of the electrical conductivity sensor 100 and the acidity sensor 200 . can be extended

The sensor automatic cleaning unit 300 may be set to perform automatic cleaning every predetermined cycle, and may be set to automatically clean whenever a fixed material of the electrical conductivity sensor 100 and the acidity sensor 200 is identified. There will be.

For reference, the eco-friendly circulation type nutrient solution supplier according to this embodiment includes only a simple configuration to clearly explain the technical idea to be proposed. That is, although not shown in FIG. 4 , the nutrient solution supply is a device that follows a circulating supply method, and the nutrient solution supply includes a raw water tank, a nutrient solution tank, a mixing tank, a display unit, a touch input unit, an operation unit, and the like.

The raw water tank basically stores distilled water or tap water, and a plurality of nutrient solution tanks are provided for each type of nutrient solution.

It is preferable that the touch input unit is disposed on the front surface of the display unit to receive touch information input by the user. Here, the touch information is detected by dividing the touch information of the user's finger horizontally and vertically, and coordinates it with X and Y. The touch input unit is a means for transmitting a signal by a user's input. In addition, the touch input unit is a touch input device composed of any one of a touch screen, a touch pad, and a tactile sensor. When a touch is made in the touch input unit composed of a touch pad, a change in physical quantities such as resistance and capacitance is detected and the occurrence of the contact is sensed and the converted signal is transmitted to the control circuit.

The control circuit can simultaneously output various state information measured by the sensor and setting data by the user stored in the storage unit according to the control setting screen mode input from the touch input unit, so that the user can conveniently recognize it. The control circuit may be configured to process the nutrient solution supply control by remotely setting the screen mode by interworking through the Internet on a smartphone or computer.

5 is an exemplary view of a microbubble generator, and FIG. 5A is an exemplary view of an orifice nozzle.

Referring to FIGS. 5 and 5A , the microbubble generating unit is formed in a structure that generates microbubbles with an orifice nozzle while reducing energy consumption by self-inhaling air using a venturi nozzle. At this time, an orifice nozzle having a diameter of 23.5 mm and a perforated plate nozzle are installed in combination to further promote the generation of microbubbles.

That is, the waste nutrient solution sterilizer 8 having a microbubble generating unit generates microbubbles through the vortex nozzle system. The vortex nozzle system is composed of a vortex inducing part for generating a vortex flow of the fluid entering the nozzle, an air inlet for introducing air, an air inlet pipe, and a nozzle outlet for generating microbubbles through the nozzle outlet. .

The waste nutrient solution sterilizer 8 is divided into a fluid recirculation unit and a microphone bubble generation unit, and the fluid recirculation unit includes a venturi nozzle, a pump, a pressure gauge, an air flow meter, a flow meter, and a microphone bubble generation unit includes a dissolution tank, an orifice nozzle system, a pressure gauge, It may be composed of a DAF system, a flow meter, a flow control valve, a check valve, and the like.

The microbubble generator can generate 20,000 EA/s or more of microbubble particles containing hydroxyl groups (OH-radica) of 45 μm or less, which have excellent purification and sterilization ability under atmospheric pressure conditions. It is configured to purify the waste nutrient solution by generating microbubbles with an orifice nozzle while minimizing energy consumption by self-inhaling air using a venturi nozzle to efficiently generate bubbles.

By using microbubbles, more than 90% of harmful bacteria such as Staphylococcus aureus or E. coli can be sterilized, and an antibacterial filter can be added to the mixing tank or waste nutrient solution sterilizer to suppress bacterial growth.

Therefore, it is possible to reduce the waste of recyclable active ingredients remaining in the waste liquid, and cost reduction effects such as reducing the cost of fertilizer use of farms are expected when the waste nutrient solution is reused.

In other words, the composition of the nutrient solution is predicted in advance by measuring the acidity (pH) and electrical conductivity (EC) sensor so that the ion imbalance is not lost, and the waste nutrient solution is recycled by adding insufficient components of the nutrient solution and diluting the excess elements. This method can be applied to reduce the amount of wastewater generated.

6 is a detailed block diagram of the sensor automatic cleaning unit 300 of the nutrient solution supply unit of FIG. 4 , FIG. 7 is a plan view of the sensor automatic cleaning unit 300 of FIG. 6 , and FIG. 8 is the sensor automatic cleaning unit of FIG. 6 ( 300) is a front view.

The sensor automatic cleaning unit 300 according to the present embodiment includes only a simple configuration for clearly explaining the proposed technical idea.

6 to 8 , the sensor automatic cleaning unit 300 includes a first input valve 310 , a second input valve 320 , a first output valve 330 , a second output valve 340 , and air. It is configured to include an injection unit 350 and a control unit 360 . In this case, the first and second input valves and the first and second output valves are defined as valves that are automatically operated under the control of the controller 360 .

The detailed configuration and main operation of the sensor automatic cleaning unit 300 configured as described above are as follows.

First, the sensor automatic cleaning unit 300 has an internal space in which the electrical conductivity sensor 100 and the acidity sensor 200 are disposed. The electrical conductivity sensor 100 and the acidity sensor 200 are configured to be replaceable and detachable from the sensor automatic cleaning unit 300 . In this embodiment, the inner space is composed of a pipe-shaped flow path, the inner space may be formed in the form of a tank according to the embodiment.

The first input valve 310 serves to selectively supply the mixed nutrient solution to the internal space, and the second input valve 320 serves to selectively supply the washing solution to the internal space.

The first output valve 330 selectively outputs the nutrient solution in the inner space and delivers it to the plant cultivation area. The second output valve 340 serves to selectively output the cleaning liquid in the internal space and discharge it to the outside.

The air injection unit 350 performs an operation of injecting air into the inner space at a predetermined pressure. Basically, the air injection unit operates when the cleaning function of the electrical conductivity sensor 100 and the acidity sensor 200 is performed.

The controller 360 sequentially controls the operations of the first and second input valves, the first and second output valves, and the air injection unit according to the setting data. That is, the setting data includes the operation time of each of the first and second input valves, the first and second output valves, the operation time of the air injection unit, the air injection pressure, and the injection time information.

The sensor automatic washing unit 300 may operate in a general mode in which the functions of the electrical conductivity sensor 100 and the acidity sensor 200 operate, and in a washing mode in which the nutrient solution supply is stopped and the washing function is operated.

In the normal mode, as the first input valve 310 is opened and the second input valve 320 is closed, the nutrient solution is transferred to the plant cultivation area through the first output valve 330 . At this time, the second output valve 340 is closed, and the electrical conductivity sensor 100 and the acidity sensor 200 detect the nutrient solution and transmit the sensed information to the controller 360 .

In the washing mode, the second input valve 320 is opened, the first input valve 310 is closed, the washing liquid flows into the inner space, and the material adhering to the electrical conductivity sensor 100 and the acidity sensor 200 is removed. The washing liquid is discharged to the outside through the second output valve 340 . The washing liquid may contain from 1 to 70% by weight of ethanol, and the basic washing liquid is composed of 70% by weight of ethanol and 30% by weight of distilled water (water).

After the washing liquid is discharged through the second output valve 340, the air injection unit 350 injects air into the inner space at a preset pressure and temperature for a predetermined time, so that the electrical conductivity sensor 100 and the acidity sensor 200 ), dry the cleaning solution on the surface.

As such, the sensor automatic cleaning unit 300 automatically cleans the electrical conductivity sensor 100 and the acidity sensor 200 using a cleaning solution through the cleaning mode, thereby replacing the electrical conductivity sensor 100 and the acidity sensor 200 cycle can be extended.

The washing mode may be set so that automatic washing is performed at every predetermined cycle, and it may be set to automatically wash whenever a fixed material of the electrical conductivity sensor 100 and the acidity sensor 200 is identified.

On the other hand, the sensor automatic cleaning unit 300 may be configured to further include an internal camera for photographing the fixed state of the electrical conductivity sensor 100 and the acidity sensor 200 .

The internal camera is disposed in the interior space, and transmits the images of the electrical conductivity sensor 100 and the acidity sensor 200 to the control unit 360 after shooting.

The control unit 360 detects the adhesion state (degree of adhesion) of the electrical conductivity sensor 100 and the acidity sensor 200 based on the photographing data of the internal camera, and then, depending on the adhesion state, the ethanol concentration of the washing solution and the supply pressure of the washing solution , the temperature of the washing solution and the washing solution input time can be automatically adjusted.

For reference, the control unit 360 may transmit the requested concentration data to a separate washing solution generator - not shown - in order to control the ethanol concentration. In addition, as another embodiment, a plurality of input valves capable of supplying washing solutions of different ethanol concentrations are provided, and the control unit may be designed to selectively open each input valve.

In addition, the sensor automatic cleaning unit 300 may be configured to further include an ultrasonic vibrator disposed to be adjacent to each other between the electrical conductivity sensor 100 and the acidity sensor 200 .

The control unit 360 detects the fixed state of the electrical conductivity sensor 100 and the acidity sensor 200 based on the photographing data of the internal camera, and then, according to the fixed state, the vibration intensity of the ultrasonic vibrator, the ethanol concentration of the washing solution, and the washing solution supply pressure can be adjusted automatically.

As another embodiment, a first ultrasonic vibrator for the electrical conductivity sensor 100 and a second ultrasonic vibrator for the acidity sensor 200 may be provided.

The first ultrasonic vibrator may output vibration while rotating along the outer periphery of the electrical conductivity sensor 100 to uniformly remove the adherent. In addition, the second ultrasonic vibrator may output vibration while rotating along the periphery of the acidity sensor 200 to uniformly remove the adherent.

In addition, the first ultrasonic vibrator and the second ultrasonic vibrator are controlled by the controller 360 to output vibrations of different intensities at each point of the rotation path based on the degree of fixation and the form of fixation determined based on the photographing data of the internal camera. can be controlled.

Meanwhile, as shown in FIG. 7 , the sensor automatic cleaning unit 300 may further include a first Doppler sensor 371 and a second Doppler sensor 372 .

When the Doppler sensor hits a moving target with a microwave signal, the frequency of this signal changes due to the Doppler effect. If motion occurs, there is a phase change of the microwave signal according to the motion. The Doppler sensor is configured as a pair of a transmitter and a receiver, and may be configured to adjust a sensing distance by adjusting a frequency or output power.

The first Doppler sensor 371 and the second Doppler sensor 372 are provided to sense the flow of the nutrient solution output to the first output valve 330 along the internal space, that is, a pipe-shaped flow path.

That is, since the flow of the nutrient solution may be lowered as the adhesion material accumulates in the electrical conductivity sensor 100 and the acidity sensor 200, the state of being stuck to the electrical conductivity sensor 100 and the acidity sensor 200 is indirectly detected by detecting this. can be grasped as

That is, the control unit 360 indirectly detects the amount of the adhering material to the electrical conductivity sensor 100 and the acidity sensor 200 based on the information of the first Doppler sensor 371 and the second Doppler sensor 372, and then washes the first You can proceed with the mod. If the flow of the nutrient solution is not improved even after the first washing mode has been performed, the controller 360 operates the internal camera to recognize the state of the adhered object and then removes the identified adherent. 2 You can proceed to the cleaning mode again. In the second cleaning mode, the vibration operation of the ultrasonic vibrator may be concurrently performed.

The first Doppler sensor 371 and the second Doppler sensor 372 are respectively arranged in a shape to face the pipe-shaped flow path diagonally to each other, each independently measure the flow of the nutrient solution in the flow path, and transmit the measurement information to the controller 360 . transmit The first Doppler sensor 371 and the second Doppler sensor 372 may use transmission signals having different frequencies.

At this time, the controller 360 collects the information of the two sensors and operates to trust the measurement information only when the flow of the nutrient solution is sensed at the same time. With this configuration, it is possible to prevent erroneous detection of the flow of other adjacent regions within the maximum measurement distance of the Doppler sensor.

The eco-friendly circulating nutrient solution supplier according to an embodiment of the present invention can sterilize the waste nutrient solution through OH-radicals generated when microbubbles are generated so that it can be reused. That is, since the microbubble generator can be mounted on a mixing tank, a waste nutrient solution collection tank, etc. to reprocess the waste nutrient solution at low cost, there is an advantage in that environmental pollution can be reduced.

In addition, the sensor automatic cleaning unit is set to perform automatic cleaning every predetermined cycle, or is set to automatically clean whenever a fixed material of the electrical conductivity sensor and the acidity sensor is identified, thereby reducing the replacement cycle of the electrical conductivity sensor and the acidity sensor can be extended

As such, those skilled in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

1: Raw water tank
2: Nutrient solution tank
3-1: first mixing tank
3-2: second mixing tank
4-1: first sensor measuring instrument
4-2: second sensor measuring device
5: Farm crops
6: Waste nutrient solution recovery tank
7: Waste nutrient solution collection tank
8: Waste nutrient solution sterilizer
9: Waste nutrient solution storage tank
100: electrical conductivity sensor
200: acidity sensor
300: sensor automatic cleaning unit
310: first input valve
320: second input valve
330: first output valve
340: second output valve
350: air injection unit
360: control

Claims (6)

In a circulating nutrient solution supplying device that reprocesses and uses waste nutrient solution supplied to crops,
a microbubble generating unit that sterilizes the waste nutrient solution using a hydroxyl group (OH-radical) generated when generating microbubbles having a diameter of 50 μm to 100 μm or less;
an electrical conductivity sensor for detecting the electrical conductivity of the nutrient solution;
an acidity sensor disposed at a predetermined separation distance from the electrical conductivity sensor and sensing an acidity (pH) of the nutrient solution; and
Including; and a sensor automatic cleaning unit for washing the electrical conductivity sensor and the acidity sensor using a cleaning solution;
The sensor automatic cleaning unit may include: an internal space in which the electrical conductivity sensor and the acidity sensor are disposed; a first input valve for selectively supplying the mixed nutrient solution to the inner space; a second input valve selectively supplying the washing liquid to the inner space; a first output valve selectively outputting the nutrient solution in the inner space; a second output valve selectively outputting the washing liquid in the inner space; an air spraying unit for spraying air at a predetermined pressure into the inner space; a control unit for sequentially controlling operations of the first and second input valves, the first and second output valves, and the air injection unit according to setting data; and an internal camera for photographing the fixed state of the electrical conductivity sensor and the acidity sensor, wherein the control unit detects the fixed state of the electrical conductivity sensor and the acidity sensor based on the photographing data of the internal camera, An eco-friendly circulating nutrient solution supplier to which microbubbles are applied, characterized in that the ethanol concentration of the washing solution and the supply pressure of the washing solution are automatically adjusted according to the state.
According to claim 1,
The microbubble generator,
An eco-friendly circulating nutrient solution supplier to which microbubbles are applied, characterized in that the microbubbles are generated with an orifice nozzle while reducing energy consumption by self-inhaling air using a venturi nozzle.
delete delete delete According to claim 1,
The control unit detects the fixed state of the electrical conductivity sensor and the acidity sensor based on the photographing data of the internal camera, and automatically adjusts the ethanol concentration of the washing solution and the supply pressure and temperature of the washing solution according to the fixed state An eco-friendly circulating nutrient solution supply with microbubbles.

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