CN104542545B - A kind of sprinkling diseases prevention device of low temperature normal atmosphere plasma activated water crops - Google Patents

Abstract

The invention discloses the sprinkling diseases prevention device of a kind of low temperature normal atmosphere plasma activated water crops.Spray pistol is connected with main frame by water pipe；In main frame, accumulator is connected with high voltage power supply, air pump and water pump respectively, and high voltage power supply is connected with plasma generator, and air pump is connected with gas flowmeter, and water pump is connected with fluid flowmeter, and milliampere ammeter is connected with plasma generator；Water pump is connected with storage tank and spray pistol respectively, and air pump is connected with plasma generator, and plasma generator extend into inside storage tank.The present invention can reduce crops and catch an illness probability, is applied to farmland, reduces the usage amount of pesticide, can decompose and will not remain in fungicide active ingredient a period of time in activated water simultaneously；Need not dielectric barrier discharge, reduce discharge voltage, structure is relatively simple and reliable, and can carry with use.

Description

A spraying and disease prevention device for crops with low temperature and atmospheric pressure plasma active water

technical field

The invention relates to a disease prevention device for crops, in particular to a disease prevention device for spraying crops with low-temperature atmospheric-pressure plasma active water, which uses the action of low-temperature atmospheric-pressure plasma and water to generate active water with bactericidal effect for spraying, Realize crop disease prevention.

Background technique

In the process of agricultural production, the prevention and control of crop diseases is usually achieved by spraying pesticides. However, this method of using pesticides will cause pesticide residues in agricultural products, soil compaction, and water pollution. Studies at home and abroad have shown that low temperature and atmospheric pressure plasma active water can kill bacteria and microorganisms. In this way, the low-temperature and atmospheric-pressure plasma active water has a good application in the field of crop disease prevention.

Many documents have proved that hydroxide ions and hydronium ions in plasma are the most effective bactericidal ions. Patent CN101156955A discloses a non-equilibrium plasma spray sterilizing disinfectant generating device, wherein the electric arc reacts with water mist to generate hydrogen peroxide, ozone, hydroxyl radicals, oxygen radicals, hydroxide ions and hydronium ions . These ingredients are mixed with the water mist to make the water mist produce a bactericidal and disinfecting effect.

The above-mentioned patented technology has problems such as uneven dynamic reaction between arc and water vapor, inconsistent atomization sterilization effect, and easy arc extinguishing.

Contents of the invention

In order to solve the problems existing in the background technology, the object of the present invention is to provide a low-temperature atmospheric-pressure plasma active water spraying and disease prevention device for crops, which aims to prevent and treat crop diseases, and utilizes the interaction of low-temperature atmospheric-pressure plasma and water to produce a bactericidal effect. Spraying with active water reduces the use of pesticides and environmental pollution.

The technical scheme adopted in the present invention is:

The invention comprises a spray gun and a main machine, the spray gun is connected with the main machine through a water pipe; the main machine is equipped with an air pump, a water pump, a water storage tank, a high-voltage power supply, a storage battery, a mA ammeter, a gas flow meter, a liquid flow meter and a plasma generator; The battery is connected to the high-voltage power supply, air pump and water pump through cables, the high-voltage power supply is connected to the plasma generator through high-voltage cables, the air pump is connected to the gas flowmeter, the water pump is connected to the liquid flowmeter, and the mA ammeter is connected to the plasma generator The input end and the output end of the water pump are respectively connected with the water storage tank and the spray gun through the water pipe, and the air pump is connected with the plasma generator through the air pipe, and the plasma generator extends into the inside of the water storage tank through the opening above the water storage tank.

The plasma generator includes a high-voltage tungsten electrode, an insulating layer, a one-way valve, an insulating seat and a stainless steel electrode; the insulating seat is installed in the opening on the upper end of the stainless steel electrode, and the high-voltage tungsten electrode extends through the air inlet hole in the center of the insulating seat. Into the opening of the upper end of the stainless steel electrode, an insulating layer is installed between the bottom of the insulating seat and the bottom of the upper opening of the stainless steel electrode, the outer diameter of the insulating layer is the same as the inner diameter of the stainless steel electrode, and the bottom of the stainless steel electrode is drilled with an air outlet, a one-way valve Installed on the air outlet of the stainless steel electrode.

The high-voltage tungsten electrode is tubular, and the end of the high-voltage tungsten electrode extending into the stainless steel electrode is tapered.

The high-voltage tungsten electrode is in interference fit with the air inlet hole in the center of the insulating seat.

The insulating layer is tubular, and the outer diameter of the insulating layer is the same as the inner diameter of the stainless steel electrode.

The air outlet at the bottom of the stainless steel electrode is fixedly connected with the one-way valve through threads.

The high-voltage power supply includes a DC conversion circuit, a rectifier circuit, a trigger circuit, an energy storage circuit and a transformer boost circuit; The output is connected to the plasma generator, and the trigger circuit is respectively connected to the energy storage circuit and the DC conversion circuit.

The DC conversion circuit includes a bipolar transistor Q1, a bipolar transistor Q3 and a closed magnetic ring pulse transformer T5; the emitters of the bipolar transistor Q1 and the bipolar transistor Q3 are connected to the positive pole of the battery, and the bipolar transistor Q1 and the The collectors of the transistor Q3 are respectively connected to the primary coils L1 and L2 of the closed magnetic ring pulse transformer, and the bases of the bipolar transistor Q1 and the bipolar transistor Q3 are respectively connected to the secondary coils L4 and L5 of the closed magnetic ring pulse transformer T5. The non-identical ends of the secondary coils L4 and L5 of the magnetic ring pulse transformer T5 are respectively connected to one end of the switch S1 and the negative pole of the capacitor C2 through the resistor R2, and the other end of the switch S1 is connected to the negative pole of the storage battery;

The rectification circuit: comprises a rectification bridge D3 and a capacitor C2; the rectification bridge D3, the secondary coil L3 of the closed magnetic ring pulse transformer T5 and the capacitor C2 form a bridge rectification circuit;

The energy storage circuit: includes a one-way thyristor Q2, a capacitor C1 and a resistor R1; the positive pole of the capacitor C2 is connected in parallel with the one-way thyristor Q2 and the current storage diode D2 respectively after passing through the diode D1 and the resistor R1 in turn, and the positive pole of the diode D1 is connected with the capacitor The positive pole of C2 is connected, the negative pole of diode D1 is connected with resistor R1, and the negative pole of current storage diode D2 is connected with the positive pole of capacitor C1;

The transformer step-up circuit includes three closed magnetic ring pulse transformers T2-T4 and a voltage regulating transformer T1; the current storage diode D2 and the capacitor C1 are connected in series with the primary coils of the three closed magnetic ring pulse transformers T2-T4 respectively 1. The primary coil of a voltage regulating transformer T1 is connected in parallel, the voltage regulating transformer T1, the closed magnetic ring pulse transformer T2, the closed magnetic ring pulse transformer T3 and the secondary coil of the closed magnetic ring pulse transformer T4 are sequentially connected in series, and the high voltage tungsten of the plasma generator The top of the electrode is connected to the terminal with the same name of the secondary coil of the closed magnetic ring pulse transformer T4 after passing through the mA ammeter, and the terminal with the same name of the secondary coil of the voltage regulating transformer T1 is connected to one end of the switch S1;

The trigger circuit: includes a single-chip microcomputer U1, a single-way inverter U2, an optocoupler U3, a resistor R3, a resistor R4, and a capacitor C3; pin 1 of the single-chip microcomputer U1 passes through the negative pole of the single-chip inverter U2 and the photocoupler U3 light emitter Connected, pin 2 of MCU U1 is grounded, pin 7 of MCU U1 is grounded after capacitor C3, pin 4 of MCU U1 is grounded through variable resistor R5, the positive pole of optocoupler U3 light emitter is connected to 5V power supply through resistor R3, optocoupler U3 The positive pole of the photoreceiver is connected to the power supply voltage, the negative pole of the photocoupler U3 is connected to the ground after the resistor R4, and the negative pole of the photocoupler U3 is connected to the gate of the one-way thyristor Q2.

The active water generated by the plasma generator is sprayed to the diseased part on the crops through a spray gun.

The beneficial effects that the present invention has are:

The device of the invention uses the plasma gas generated by the low-temperature plasma generator to react with water through a one-way valve to produce active water with bactericidal effect, and then sprays the generated active water on the crops through a water pump. The invention solves the problem of arc and water vapor dynamics There are problems such as uneven reaction, inconsistent atomization sterilization effect and easy arc extinguishing.

Moreover, the present invention does not need to obtain plasma through dielectric barrier discharge, and reduces the required discharge voltage. pollute.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is an enlarged sectional view of a plasma generator.

Fig. 3 is a schematic diagram of the structure of the host.

Figure 4 is a block diagram of the basic circuit of the high-voltage power supply.

Fig. 5 is a circuit diagram of a high voltage power supply.

Fig. 6 is a schematic diagram of the implementation of the present invention.

In the figure: 1. Spray gun, 2. Crops, 3. Host, 4. Diseased area, 5. Active water, 31. Air pump, 32. Water pump, 33. Water storage tank, 34. High voltage power supply, 35. Battery, 36. mA ammeter, 37. Gas flowmeter, 38. Liquid flowmeter, 39. Plasma generator, 391. High-voltage tungsten electrode, 392. Insulation layer, 393. Check valve, 394. Insulation seat, 395. Stainless steel electrode.

detailed description

The present invention will be further described below in conjunction with drawings and embodiments.

As shown in Figure 1, the present invention comprises spray gun 1 and host 3, and spray gun 1 is connected with host 3 through water pipe; As shown in Figure 3, air pump 31, water pump 32, water storage tank 33, high voltage power supply are installed in host 3 34. Storage battery 35, mA ammeter 36, gas flowmeter 37, liquid flowmeter 38 and plasma generator 39; storage battery 35 is connected with high-voltage power supply 34, air pump 31 and water pump 32 through cables respectively, and high-voltage power supply 34 is connected through high-voltage cables Link to each other with plasma generator 39, air pump 31 links to each other with gas flow meter 37, water pump 32 links to each other with liquid flow meter 38, milliampere meter 36 links to each other with plasma generator 39; The water storage tank 33 is connected to the spray gun 1, the air pump 31 is connected to the plasma generator 39 through the air pipe, and the plasma generator 39 extends into the water storage tank 33 through the opening on the water storage tank 33. The mode is that the active water 5 generated by the plasma generator 39 is sprayed to the diseased part above the crops 2 by the spray gun 1 .

As shown in Figure 2, the plasma generator 39 comprises a high-voltage tungsten electrode 391, an insulating layer 392, a one-way valve 393, an insulating seat 394 and a stainless steel electrode 395; Electrode 391 stretches in the perforation of stainless steel electrode 395 upper ends through the inlet hole of insulating seat 394 center, and insulating layer 392 is housed between the bottom of insulating seat 394 bottom and the bottom of stainless steel electrode 395 upper end opening, and insulating layer 392 external diameters Identical with the inner diameter of the stainless steel electrode 395, an air outlet is drilled at the bottom of the stainless steel electrode 395, and the check valve 393 is installed on the air outlet of the stainless steel electrode 395.

The high-voltage tungsten electrode 391 is tubular, and the end of the high-voltage tungsten electrode 391 protruding into the stainless steel electrode 395 is tapered.

The high-voltage tungsten electrode 391 is in interference fit with the air inlet hole at the center of the insulating seat 394 .

The insulating layer 392 is tubular, and the outer diameter of the insulating layer 392 is the same as the inner diameter of the stainless steel electrode 395 . The insulating layer 392 is embedded between the high-voltage tungsten electrode 391 and the stainless steel electrode 395, and the axial distance between the end of the high-voltage tungsten electrode 391 near the air outlet and the end of the air outlet of the stainless steel electrode 395 is 2 mm.

The air outlet at the bottom of the stainless steel electrode 395 is fixedly connected with the one-way valve 393 by threads.

As shown in Figure 4, the high-voltage power supply 34 includes a DC conversion circuit, a rectification circuit, a trigger circuit, an energy storage circuit, and a transformer boost circuit; the storage battery 35 is connected to the transformer boost circuit after being sequentially passed through a DC conversion circuit, a rectification circuit, and an energy storage circuit. , the output of the transformer step-up circuit is connected to the plasma generator 39, and the trigger circuit is connected to the energy storage circuit and the DC conversion circuit respectively.

As shown in Figure 5, the above-mentioned DC conversion circuit includes bipolar transistor Q1, bipolar transistor Q3 and closed magnetic ring pulse transformer T5; the emitters of bipolar transistor Q1 and bipolar transistor Q3 are connected to the positive pole of storage battery 35, bipolar The collectors of the transistor Q1 and the bipolar transistor Q3 are respectively connected to the primary coils L1 and L2 of the closed magnetic ring pulse transformer, and the bases of the bipolar transistor Q1 and the bipolar transistor Q3 are respectively connected to the secondary coil L4 of the closed magnetic ring pulse transformer T5 Connected to L5, the non-identical ends of the secondary coils L4 and L5 of the closed magnetic ring pulse transformer T5 are respectively connected to one end of the switch S1 and the negative pole of the capacitor C2 through the resistor R2, and the other end of the switch S1 is connected to the negative pole of the storage battery 35 .

As shown in FIG. 5 , the above-mentioned rectification circuit: includes a rectification bridge D3 and a capacitor C2; the rectification bridge D3, the secondary coil L3 of the closed magnetic ring pulse transformer T5 and the capacitor C2 form a bridge rectification circuit.

As shown in Figure 5, the above-mentioned energy storage circuit: includes a one-way thyristor Q2, a capacitor C1 and a resistor R1; the anode of the capacitor C2 is respectively connected in parallel with the one-way thyristor Q2 and the current storage diode D2 through the diode D1 and the resistor R1 in turn, and the diode D1 The positive pole of the diode D1 is connected to the positive pole of the capacitor C2, the negative pole of the diode D1 is connected to the resistor R1, and the negative pole of the current storage diode D2 is connected to the positive pole of the capacitor C1.

As shown in Figure 5, the above-mentioned transformer step-up circuit: includes three closed magnetic ring pulse transformers T2 ~ T4 and a voltage regulating transformer T1; the current storage diode D2 is connected in series with the capacitor C1 and connected with the three closed magnetic ring pulse transformers T2 ~ The primary coil of T4 and the primary coil of a voltage regulating transformer T1 are connected in parallel, the voltage regulating transformer T1, the closed magnetic ring pulse transformer T2, the closed magnetic ring pulse transformer T3 and the secondary coil of the closed magnetic ring pulse transformer T4 are connected in series in sequence, and the plasma is generated The top of the high-voltage tungsten electrode 391 of the device 39 is connected with the same-named end of the secondary coil of the closed magnetic ring pulse transformer T4 after passing through the mA ammeter 36, and the non-identical end of the secondary coil of the voltage regulating transformer T1 is connected with one end of the switch S1.

As shown in Figure 5, the above-mentioned trigger circuit: includes single-chip microcomputer U1, single-way inverter U2, optocoupler U3, resistor R3, resistor R4 and capacitor C3; pin 1 of single-chip microcomputer U1 passes through single-way inverter U2 and optocoupler U3 The negative pole of the light emitter is connected, the 2-pin of the single-chip microcomputer U1 is grounded, the 7-pin of the single-chip microcomputer U1 is grounded after passing through the capacitor C3, the 4-pin of the single-chip microcomputer U1 is grounded through the variable resistor R5, and the positive pole of the optocoupler U3 light emitter is connected to the 5V power supply through the resistor R3 , the positive pole of the optocoupler U3 light receiver is connected to the power supply voltage, the negative pole of the optocoupler U3 light receiver is grounded after the resistor R4, and the negative pole of the optocoupler U3 light receiver is connected to the gate of the one-way thyristor Q2.

The model of the preferred microcontroller U1 can be ATtiny5, and the model of the single-way inverter U2 can be SN74AHCT1G04.

The high-voltage tungsten electrode 391 of the present invention is connected to the output end of the high-voltage power supply 35 of the host, and the stainless steel electrode 395 is grounded, so that a strong electric field will be generated between the two electrodes. The high-voltage tungsten electrode 11 is tubular, and the end close to the gas outlet of the stainless steel electrode 395 is conical, which will generate an extremely uneven electric field, thereby generating corona, which is beneficial to the generation of plasma. One end of the gas outlet of the stainless steel electrode 395 is connected to the one-way valve through threads. Due to the existence of the one-way valve, water will not flow into the plasma generator 39 in reverse, and the place where the plasma is directly generated will not contact the outside water, thus ensuring The stability of the reaction; the generated plasma is ejected from the one-way valve by the pressure of the air pump 31, and reacts with the outside water to generate active water 5 with bactericidal effect. The generated active water 5 flows out from the water storage tank 33 through the water pump 32 , enters the spray gun 1 and is sprayed on the surface of the crops 2 .

The mA ammeter 36 in the host 3 is used to monitor the discharge intensity between the electrodes; the gas flowmeter 37 is used to monitor the flow rate of the plasma flow ejected from the gas outlet; the high voltage power supply is adjusted by adjusting the ratio of the voltage regulating transformer T1 34 output voltage. Through these three aspects and the adjustment of the reaction time, the intensity of the reaction between the low-temperature plasma and water and the concentration of the generated active water 5 can be adjusted to meet different needs.

Figure 4 is the basic principle block diagram of a portable high-voltage power supply. The 6V DC generated by the battery passes through the DC conversion circuit to form a high-frequency oscillation to generate an AC square wave voltage, which is then boosted by a closed magnetic ring pulse transformer, and then passed through the rectifier bridge D3 The alternating pulse voltage is rectified into direct current, the trigger circuit controls the turn-on and turn-off of the one-way thyristor Q2, and then controls the energy storage state of the capacitor in the energy storage circuit, and finally outputs high-voltage pulse power through the closed magnetic ring transformer boost circuit to On the high voltage tungsten electrode 391 in the plasma generator 39.

In the DC conversion circuit, when the switch S1 is closed, the emitters of the bipolar transistor Q1 and the bipolar transistor Q3 are connected to the DC power supply, and under the action of the secondary coils L4 and L5 of the closed magnetic ring pulse transformer T5, the bipolar transistor Q1 and the bipolar transistor Q3 The bipolar transistor Q3 is turned on in turn, and an alternating pulse voltage is obtained on the secondary coil L3 of the transformer T5.

The pulse control signal output by the trigger circuit turns on or off the optocoupler U3 through the single inverter, and then controls the one-way thyristor Q2 in the energy storage circuit to turn on and off.

In the energy storage circuit, the capacitor C1 is charged and discharged by turning on and off the one-way thyristor Q2. When the trigger circuit outputs a low level, the one-way thyristor Q2 is turned off, and the capacitor C1 is in a charging state. When the trigger circuit outputs a high level, the one-way thyristor Q2 is turned on, and the capacitor C1 is in a discharging state. When the discharge of the capacitor C1 is completed , when the anode current of the one-way thyristor Q2 is lower than the holding current, the one-way thyristor Q2 is turned off, and at this time the circuit starts to charge the capacitor C1 again to complete a capacitor charging and discharging cycle. The period of the output signal of the trigger circuit is the time constant of discharging or charging the capacitor C1.

In the transformer step-up circuit, such an alternating pulse voltage is stepped up step by step through three closed magnetic ring pulse transformers and a voltage regulating transformer to finally achieve the purpose of outputting high-voltage pulse electricity.

As shown in Figure 5, it is a circuit diagram of a high-voltage power supply. The 6V DC is converted into an alternating pulse voltage by the bipolar transistors Q1 and Q3 in the DC conversion circuit, boosted by the closed magnetic ring pulse transformer T5, and then rectified by the rectifier bridge D3. , to form a direct current, at this time the trigger circuit generates a pulse control signal to control the one-way thyristor Q2 in the energy storage circuit to turn on and off, so as to realize the charging and discharging of the capacitor C1 in the energy storage circuit, and then through the voltage regulation of the transformer step-up circuit The transformer and the closed magnetic ring pulse transformer generate 5~30kV high-voltage pulse electricity, and the low-temperature plasma generator outputs 5~30kV high-voltage pulse electricity through the power line.

As shown in Fig. 6, it is a working diagram of the device of the present invention. When the crops 2 are infected, aim the isospray gun 1 at the diseased part 4 on the leaves of the crops 2, and adjust the generation rate and concentration of the active water 5 by adjusting the output voltage and the speed of the air pump. Concentration of active water 5, flexible use. When the crops 2 are not diseased, the low-concentration active water 5 can be sprayed on the crops 2 to prevent crop diseases.

Thus, the device of the present invention generates active water with bactericidal effect and sprays it on the crops, which solves the problems of uneven dynamic response, atomized bactericidal effect, and arc extinguishing, and has a relatively simple and reliable structure, reducing the amount of pesticide used. It can reduce pesticide residues and environmental pollution, and has outstanding technical effects.

The above specific embodiments are used to explain the present invention, rather than to limit the present invention. Within the spirit of the present invention and the protection scope of the claims, any modification and change made to the present invention will fall into the protection scope of the present invention.

Claims (8)

1. a spraying disease prevention device of low temperature atmospheric pressure plasma active water crops, it is characterized in that: comprise spray gun (1) and main frame (3), spray gun (1) links to each other with main frame (3) by water pipe; Main frame ( 3) An air pump (31), a water pump (32), a water storage tank (33), a high-voltage power supply (34), a storage battery (35), a mA ammeter (36), a gas flowmeter (37), and a liquid flowmeter are installed inside (38) and plasma generator (39); Storage battery (35) links to each other with high-voltage power supply (34), air pump (31) and water pump (32) by cable respectively, and high-voltage power supply (34) generates plasma by high-voltage cable device (39), the air pump (31) is connected to the gas flow meter (37), the water pump (32) is connected to the liquid flow meter (38), and the mA ammeter (36) is connected to the plasma generator (39); the water pump The input end and the output end of (32) link to each other with water storage tank (33) and spray gun (1) by water pipe respectively, and air pump (31) links to each other with plasma generator (39) by air pipe, and plasma generator (39) ) into the inside of the water storage tank (33) through the opening above the water storage tank (33); Described plasma generator (39) comprises high voltage tungsten electrode (391), insulating layer (392), one-way valve (393), insulating seat (394) and stainless steel electrode (395); insulating seat (394) is contained in In the opening of the stainless steel electrode (395) upper end, the high-voltage tungsten electrode (391) passes through the air inlet at the center of the insulating seat (394) and stretches into the opening at the upper end of the stainless steel electrode (395), and the bottom of the insulating seat (394) is connected to the upper end of the stainless steel electrode (395). An insulating layer (392) is installed between the bottoms of the openings at the upper end of the stainless steel electrode (395), the outer diameter of the insulating layer (392) is the same as the inner diameter of the stainless steel electrode (395), and an air outlet is drilled at the bottom of the stainless steel electrode (395). Valve (393) is installed on the air outlet of stainless steel electrode (395). 2. A kind of low-temperature and atmospheric-pressure plasma active water spraying disease prevention device for crops according to claim 1, characterized in that: the high-voltage tungsten electrode (391) is tubular, and the high-voltage tungsten electrode (391) extends into the One end inside the stainless steel electrode (395) is tapered. 3. The spraying and disease prevention device of a kind of low temperature atmospheric pressure plasma active water crops according to claim 1, is characterized in that: described high voltage tungsten electrode (391) passes through the air inlet hole of insulating seat (394) center surplus cooperation. 4. The spraying and disease prevention device of a kind of low temperature atmospheric pressure plasma active water crops according to claim 1, is characterized in that: described insulating layer (392) is tubular, and insulating layer (392) outer diameter and stainless steel electrode (395) same inner diameter. 5. The spraying and disease prevention device of a kind of low-temperature and atmospheric-pressure plasma active water crops according to claim 1, characterized in that: the air outlet at the bottom of the stainless steel electrode (395) passes through the screw thread and the one-way valve (393) Fixed connection. 6. The spraying and disease prevention device for low-temperature and atmospheric-pressure plasma active water crops according to claim 1, characterized in that: the high-voltage power supply (34) includes a DC conversion circuit, a rectifier circuit, a trigger circuit, an energy storage circuit and transformer step-up circuit; the storage battery (35) is connected with the transformer step-up circuit after passing through the DC conversion circuit, the rectifier circuit and the energy storage circuit in turn, and the output of the transformer step-up circuit is connected to the plasma generator (39), and the trigger circuit They are respectively connected with the energy storage circuit and the DC conversion circuit. 7. A low-temperature and atmospheric-pressure plasma active water spraying and disease prevention device for crops according to claim 6, characterized in that: the DC conversion circuit includes a bipolar transistor Q1, a bipolar transistor Q3 and a closed magnetic ring Pulse transformer T5; the emitters of bipolar transistor Q1 and bipolar transistor Q3 are connected to the positive pole of storage battery (35), and the collectors of bipolar transistor Q1 and bipolar transistor Q3 are respectively connected to the primary coil L1 and L2 of the closed magnetic ring pulse transformer The bases of the bipolar transistor Q1 and the bipolar transistor Q3 are respectively connected to the secondary coils L4 and L5 of the closed magnetic ring pulse transformer T5, and the non-identical ends of the secondary coils L4 and L5 of the closed magnetic ring pulse transformer T5 are sequentially passed through The resistor R2 is connected to one end of the switch S1 and the negative pole of the capacitor C2 respectively, and the other end of the switch S1 is connected to the negative pole of the storage battery (35); The rectification circuit: comprises a rectification bridge D3 and a capacitor C2; the rectification bridge D3, the secondary coil L3 of the closed magnetic ring pulse transformer T5 and the capacitor C2 form a bridge rectification circuit; The energy storage circuit: comprises a one-way thyristor Q2, a capacitor C1 and a resistor R1; the anode of the capacitor C2 is respectively connected in parallel with the one-way thyristor Q2 and the freewheeling diode D2 after passing through the diode D1 and the resistor R1 in turn, and the anode of the diode D1 is connected in parallel with the capacitor The positive pole of C2 is connected, the negative pole of diode D1 is connected with resistor R1, the negative pole of freewheeling diode D2 is connected with the positive pole of capacitor C1; The transformer step-up circuit includes three closed magnetic ring pulse transformers T2-T4 and a voltage regulating transformer T1; the freewheeling diode D2 and the capacitor C1 are connected in series with the primary coils of the three closed magnetic ring pulse transformers T2-T4 respectively 1. The primary coil of a voltage regulating transformer T1 is connected in parallel, the secondary coil of the voltage regulating transformer T1, the closed magnetic ring pulse transformer T2, the closed magnetic ring pulse transformer T3 and the closed magnetic ring pulse transformer T4 are sequentially connected in series, and the plasma generator (39) The top of the high-voltage tungsten electrode (391) is connected to the terminal with the same name of the secondary coil of the closed magnetic ring pulse transformer T4 after passing through the mA ammeter (36), and the terminal with the same name of the secondary coil of the voltage regulating transformer T1 is connected to one end of the switch S1 ; The trigger circuit: includes a single-chip microcomputer U1, a single-way inverter U2, an optocoupler U3, a resistor R3, a resistor R4, and a capacitor C3; pin 1 of the single-chip microcomputer U1 passes through the negative pole of the single-chip inverter U2 and the photocoupler U3 light emitter Connected, pin 2 of MCU U1 is grounded, pin 7 of MCU U1 is grounded after capacitor C3, pin 4 of MCU U1 is grounded through variable resistor R5, the positive pole of optocoupler U3 light emitter is connected to 5V power supply through resistor R3, optocoupler U3 The positive pole of the photoreceiver is connected to the power supply voltage, the negative pole of the photocoupler U3 is connected to the ground after the resistor R4, and the negative pole of the photocoupler U3 is connected to the gate of the one-way thyristor Q2. 8. A kind of low temperature atmospheric pressure plasma active water crops spraying disease prevention device according to claim 1, is characterized in that: the active water (5) that described plasma generator (39) generates passes spray gun ( 1) Spray on the diseased part above the crops (2).