A rotating plasma seed treatment device

Abstract

The present invention provides a rotating plasma seed processing device, wherein a feed port and a discharge port are provided on the outer glass tube, a metal rod is provided in the inner glass tube, a metal mesh is wrapped around the outer glass tube, two through-hole covers are respectively located at both ends of the outer glass tube, and are tightly connected to the outer glass tube to play a sealing role, a first motor handle passes through the first through-hole cover and is fixedly connected to the inner glass tube, and the other end is connected to the first motor, and the metal rod passes through the second through-hole cover at the other end and enters the inner glass tube. The present invention places seeds in the discharge area, and performs a large amount of seed processing through the inner quartz glass tube. The discharge form is a coaxial dielectric barrier discharge, and the generated VDBD realizes all-round and uniform plasma processing of seeds by rotating, so that the plasma can act more fully. By controlling the direction of the motor, a cyclic processing mode can be realized, the germination rate of seeds can be improved, and the agricultural production efficiency can be improved.

Description

Technical Field

[0001] The invention belongs to the field of seed processing and relates to a rotary plasma seed processing device. Background Art

[0002] Seeds, as living organisms, are the starting materials in crop production. The characteristics of high-quality seeds are high seed vitality, which can ensure rapid germination and make seedlings strong. Seed treatment can enhance seed vitality, improve seedling quality, prevent pests and diseases, promote the vigorous growth of seedlings and improve yield efficiency. Traditional seed treatment methods include physical methods, chemical methods, etc., but these methods have certain limitations. For example, the equipment required for physical treatment is large and the equipment price is relatively expensive. At the same time, physical treatment is also an energy-intensive process, which requires the combustion of a large amount of fossil energy such as oil and natural gas. The energy loss is relatively serious, and greenhouse gases such as CO2 will be produced, causing environmental pollution; chemical treatment is to stimulate seed germination by giving seeds an appropriate environment and enzyme activators, etc. The operation is more cumbersome, and harmful substances and toxic gases may be produced during the treatment process.

[0003] The plasma method is an efficient seed treatment method. Many physical and chemical reactions that cannot be carried out under conventional conditions can occur in the plasma environment. DBD is a common way to produce low-temperature plasma and is widely used in textile surface modification, sterilization and disinfection, and air purification. At present, the structure of traditional DBD is plate-plate DBD. During the application process, there will inevitably be a situation where the active species produced by the reaction diffuse between the plates and the discharge intensity is weak, and the seed treatment effect is not good. The discharge process of DBD occurs between the plates of the high-voltage electrode and the ground electrode. Discharge is easier to occur, but the plasma utilization efficiency is poor, and the seed treatment area is low.

[0004] DBD plasma treatment of seeds, such as the dielectric barrier discharge seed treatment device proposed in patent CN 110036717 A, which uses stainless steel mesh as high-voltage electrode and ground electrode, quartz glass as barrier medium, and the seeds to be treated are placed between the high-voltage electrode and the intermediate medium cover to save its use space. However, the discharge is unstable and the treatment effect is poor, which limits the effect of plasma; the vibration uniform distribution plasma seed treatment machine proposed in patent CN 111924508 A, the distribution process of the device adopts the form of electromagnetic vibration distribution, and a row of seeds are sent into the conveying device, and the seeds are automatically flattened and evenly distributed during the distribution process through adjustment. However, the device is large in size, heavy in weight, and not easy to move as a whole, which greatly limits the use environment, and the equipment is extremely expensive and not economical and practical; patent CN110430653 A proposes a double-layer gas layout large-area dielectric barrier discharge array device, which passes oxygen and argon into the gas chamber respectively during operation, and working substances such as liquid fabrics and seeds are placed in the reaction chamber for treatment. However, it uses solution as the barrier medium, and its pH value will be greatly reduced after the plasma action, and the resulting acidic solution will damage the equipment. Summary of the invention

[0005] 1. Technical problems to be solved:

[0006] The seed treatment method of the existing plasma method is that the structure of the traditional DBD is plate-plate DBD. During the application process, the active species generated by the reaction diffuse between the plates and the discharge intensity is weak, so the seed treatment effect is not good. Discharge is easy to occur, but the plasma utilization efficiency is poor, and the seed treatment area is low.

[0007] 2. Technical solution:

[0008] In order to solve the above problems, the present invention provides a rotating plasma seed processing device, including a coaxial DBD plasma processing device, the coaxial DBD plasma processing device includes an inner glass tube and an outer glass tube, the outer glass tube is provided with a feed port and a discharge port, the inner glass tube is provided with a metal rod connected to a high-voltage excitation source, the outer glass tube is wrapped with a metal mesh, the discharge area is between the inner wall of the outer glass tube and the outer wall of the inner glass tube, and also includes two through-hole covers respectively located at both ends of the outer glass tube, and tightly connected to the outer glass tube to play a sealing role, a first motor handle on one side passes through the first through-hole cover and is fixedly connected to the inner glass tube, the other end of the first motor handle is connected to the first motor, and under the drive of the motor, the first motor handle rotates, driving the inner glass tube to rotate, and the metal rod passes through the second through-hole cover at the other end and enters into the inner glass tube.

[0009] Furthermore, the outer wall of the inner glass tube is spiral-shaped.

[0010] Furthermore, there are two motors, which are arranged in a motor housing and also include a second motor handle. The second motor handle is fixedly connected to the first through-hole cover, and the other end of the second motor handle is connected to the second motor. When driven by the second motor, the second motor handle rotates, driving the outer glass tube to rotate.

[0011] Furthermore, the first motor and the second motor rotate in opposite directions.

[0012] Furthermore, it also includes an elastic iron sheet, one end of which is fixed to the outside of the motor case, and the other end is tightly fitted to the metal mesh, and the elastic iron sheet and the metal mesh together constitute a grounding electrode.

[0013] Furthermore, one end of the elastic iron sheet is a flat head through-shaped screw hole, and the one end of the elastic iron sheet is fixed to the outside of the motor case by screws.

[0014] Furthermore, the material of the metal mesh and the metal rod is a mixture of one or more of brass, tungsten, iron and stainless steel.

[0015] Furthermore, the metal mesh and the metal rod are made of brass.

[0016] Furthermore, the high-voltage excitation source is a nanosecond pulse power supply.

[0017] Furthermore, it also includes a green energy collection module, which converts the collected solar energy into electrical energy and supplies it to the driving power supply and motor module.

[0018] 3. Beneficial effects:

[0019] DBD is used as the discharge form. Compared with the negative pressure drainage sliding arc discharge which only treats one side of the seed, resulting in poor treatment effect and extremely high energy consumption, the present invention has high energy utilization rate, and the discharge occurs between the glass tubes. The special electrode structure produces VDBD, which further improves the treatment effect.

[0020] Air is used as the working gas, and deionized water, air flow pump, etc. are not used. Compared with the high cost of low-temperature plasma activated water seed treatment based on surface dielectric barrier discharge and real-time monitoring and control of the air pump flow rate, it is more economical, reduces the operating difficulty for users, and makes seed processing more convenient.

[0021] Directly treating seeds in the reactor takes a long time compared to using activated water generated by air discharge plasma reaction to treat seeds. The present invention places the seeds between glass tubes for immediate treatment. The treatment process is simple and there is no need to wait for a specific time, thereby improving the efficiency of seed treatment from the source.

[0022] The inner small quartz glass tube can effectively protect the high-voltage electrode copper rod to prevent the surface wear of the electrode caused by the seeds, while the outer quartz glass tube protects the copper mesh. Compared with the plasma activated water treatment of seeds, the electrodes are immersed in acidic solution for a long time, and the electrodes need to be replaced frequently due to solution corrosion, and the replacement of electrodes is cumbersome. The hardware loss of the present invention is greatly reduced, the durability is good, and there is no need to replace the electrodes, which can effectively reduce the difficulty of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a system structure diagram.

[0024] Figure 2 It is a schematic diagram of the coaxial DBD plasma seed treatment device.

[0025] Figure 3 It is a schematic diagram of the processing area of ​​the coaxial DBD plasma treatment seed device.

[0026] Figure 4 It is a schematic diagram of the spiral shape of the outer wall of the inner glass tube.

[0027] Figure 5 This is a schematic diagram of the outer glass tube.

[0028] Figure 6 It is a schematic diagram of the ground electrode iron sheet.

[0029] Figure 7 It is a flow chart of seed processing.

[0030] Explanation of the reference numerals: 1. Motor housing; 101. Feed inlet; 102. Inner glass tube; 103. Outer glass tube; 104. Discharge port; 2. First motor handle; 3. Second motor handle; 4. First through-hole cover; 5. Processing area; 6. Unprocessed seeds; 7. Elastic iron sheet; 8. Metal mesh; 9. Processed seeds; 10. Second through-hole cover; 11. Metal rod; 12. Driving power source; 201. Flat-head through-hole screw hole. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0032] like Figure 2 As shown, a rotary plasma seed processing device includes a coaxial DBD plasma processing device, the coaxial DBD plasma processing device includes an inner glass tube 102 and an outer glass tube 103, and the outer glass tube 103 is provided with a feed port 101 and a discharge port 104, as shown in FIG. Figure 5 shown.

[0033] The inner glass tube 102 is provided with a metal rod 11 connected to a high voltage excitation source 12, the outer glass tube 103 is wrapped with a metal mesh 8, and the discharge region 5 is between the inner wall of the outer glass tube 103 and the outer wall of the inner glass tube 102. Figure 3 shown.

[0034] like Figure 3 As shown, it also includes two through-hole covers respectively located at the two ends of the outer glass tube 103, and tightly connected to the outer glass tube 103 to play a sealing role. The motor handle 2 on one side passes through the first through-hole cover 4 and is fixedly connected to the inner glass tube 102. The other end of the first motor handle 2 is connected to the first motor. Under the drive of the motor, the first motor handle 2 rotates, driving the inner glass tube 102 to rotate, and the metal rod 11 passes through the second through-hole cover 10 at the other end and enters into the inner glass tube 102.

[0035] The present invention adopts the form of a rod-shaped high-voltage electrode and a mesh ground electrode, namely a coaxial DBD. Compared with the plate-plate DBD, a high-intensity electric field can be realized in the discharge space, the discharge intensity can be increased, VDBD can be realized, seeds can be processed efficiently, and it is suitable for large-area and uniform seed processing.

[0036] The discharge process of coaxial DBD occurs between the high voltage electrode and the ground electrode. Discharge is easy to occur, but the plasma utilization efficiency is poor and the seed area that can be treated is low. Coaxial DBD can generate a large amount of plasma, and its rotation form can evenly treat the treated object. This method has low discharge difficulty and high product utilization rate. It achieves low energy consumption, high efficiency, high quality and large-area seed treatment.

[0037] The working gas of the coaxial DBD plasma treatment device is air, which is easy to obtain and does not require deionized water, thereby reducing the use cost. At the same time, the overall cost of the equipment is low and more economical. The seeds are placed in the discharge area 5, and a large number of seed treatments are performed. The discharge form is a coaxial dielectric barrier discharge, which has a mild discharge intensity and will not damage the seed surface. The generated VDBD realizes uniform plasma treatment of the seeds in all directions through rotation.

[0038] In one embodiment, the outer wall of the inner glass tube 102 is spiral. The spiral shape can control the seed processing time and the processing area, and can complete the small seed processing in a short time, and can also meet the processing needs of medium and large seeds. At the same time, the spiral glass tube can be used to transport seeds from the feed port to the discharge port, and at the same time, the seeds are kept rolling during the transportation path to achieve uniform processing.

[0039] The seeds 6 that have not been treated with plasma are placed in the feed port 101 and are placed between the spiral glass tubes. They rotate with the tubes and are continuously pushed forward. At the same time, they can be treated in all directions in the tubes.

[0040] In one embodiment, there are two motors, which are arranged in the motor chassis 1 and also include a second motor handle 3. The second motor handle 3 is fixedly connected to the first through-hole cover 4. The other end of the second motor handle 4 is connected to the second motor. When driven by the second motor, the second motor handle 3 rotates, driving the outer glass tube 103 to rotate.

[0041] In one embodiment, the two motors rotate in opposite directions. The dual motors with counter-rotating directions will respectively drive the metal mesh 8, the outer glass tube 103 and the inner glass tube 102 to rotate, making the seed processing effect more efficient.

[0042] A motor is used to drive the reaction device to rotate, and VDBD is realized between the two electrodes at the same time, which can treat seeds in all directions. The plasma action is mild and can effectively treat the seeds without causing irreversible thermal damage to the seeds, and it has strong reliability.

[0043] In one embodiment, Figure 6 As shown, further, it also includes an elastic iron sheet 7, one end of which is fixed to the outside of the motor case 1, and the other end is tightly attached to the metal mesh 8, and the elastic iron sheet 7 and the metal mesh 8 together constitute a grounding electrode. The elastic iron sheet 7 is attached to the brass mesh to maintain the copper mesh grounded while rotating, thereby ensuring the stability of the device operation.

[0044] In one embodiment, one end of the elastic iron sheet 7 is a flat-head through-shaped screw hole 201 , and one end of the elastic iron sheet 7 is fixed to the outside of the motor case 1 by screws, and the other end is tightly attached to the metal mesh 8 .

[0045] In one embodiment, the metal mesh 8, as a coaxial DBD ground electrode, can be made of brass, iron, stainless steel and other materials. Considering the aesthetics and stability, brass is preferably used. To ensure that the brass mesh completely covers the glass tube, a copper mesh with a size of 20 mesh is selected. The metal rod 11 is a rod-shaped high-voltage electrode, which can be made of brass, tungsten, iron, stainless steel and other materials. Considering the conductivity, durability, stability and economic practicality, brass is preferably used.

[0046] In one embodiment, Figure 1 As shown, a high-voltage AC power supply based on solar energy drive is used for power supply. The solar energy collection module converts the collected solar energy into electrical energy. The inverter converts the electrical energy into AC power. The booster is used to increase the power supply voltage to supply power to the driving power supply. The driving power supply provides high voltage to the reaction device, and the device runs to process seeds.

[0047] In one embodiment, the device can be driven by various types of high-voltage excitation sources, including pulse power sources (nanosecond, microsecond), AC power sources, etc. Relatively speaking, the discharge effect driven by nanosecond pulse power sources is more stable and uniform, with low power and high energy efficiency.

[0048] The rotary coaxial DBD plasma seed processing device of the present invention mainly comprises a plasma reactor, a high voltage power supply and a motor. The electrode structure is a mesh-rod, the discharge form is a VDBD based on air discharge, and the power supply is a high voltage nanosecond pulse power supply.

[0049] The inner glass tube 102 and the outer glass tube 103 are used as the reactor chamber carrier, and the overall sealing performance is excellent, which can ensure that the seeds are evenly placed in the discharge space from the right side of the reactor and are treated by the plasma in all directions. The rod-shaped high-voltage electrode is fixed in the inner small glass tube of the reactor, and the ground electrode is made of iron sheet and copper mesh, and the copper mesh wraps the outer large glass tube. The dual motors with opposite rotation directions will drive the copper mesh, the outer glass tube and the internal spiral conveying glass tube respectively, so that the seed treatment effect is more perfect. At the same time, the elastic iron sheet is tightly attached to the copper mesh, which can ensure that the glass tube and the copper mesh rotate while the copper mesh and the iron sheet are tightly attached, thereby ensuring the conductive connectivity of the ground electrode. The symmetrical electrode structure forms a uniform electric field in the reactor, so that the discharge plasma is evenly generated between the glass tubes, forming a VDBD. It not only greatly reduces the difficulty of discharge and improves the discharge intensity, but also makes the reaction more sufficient, and enhances the effect of plasma treatment of seeds.

[0050] After the circuit is turned on, the motor starts to rotate, and the air in the glass tube of the plasma reaction device is broken down by the strong electric field generated by the high-voltage pulse excitation source to generate excited nitrogen atoms N* and oxygen atoms O*. The plasma mainly composed of active nitrogen and oxygen species, namely ROS and RNS, acts on the seeds between the tubes. Under the continuous action of VDBD, the germination difficulty of the seeds is reduced, the germination time of the seeds is shortened, and the germination rate of the seeds is further improved.

[0051] The working process of the device of the present invention is as follows: Figure 7 As shown, the high-voltage power supply is turned on, and the motor is started first, so that the motor starts working, driving the spiral conveying glass inside the device to rotate. At the same time, the coaxial DBD driven by the pulse power supply begins to generate plasma between the glass tubes. The seeds are placed in the device through the feed port, rotate with the spiral conveying glass tube and continuously move forward. The VDBD generated in the device processes the seeds evenly. In order to accurately process different types of seeds and meet different processing requirements, the direction and working time of the motor can be further controlled by selecting single rapid processing or cyclic continuous processing. The processed seeds 9 will eventually be transported to the discharge port 104 for discharge. After all of them are taken out, the power of the device is turned off.

Claims

1. A rotary plasma seed processing device, comprising a coaxial DBD plasma processing device, the coaxial DBD plasma processing device comprising an inner glass tube (102) and an outer glass tube (103), the outer glass tube (103) being provided with a feed port (101) and a discharge port (104), the inner glass tube (102) being provided with a metal rod (11) connected to a high-voltage excitation source (12), the outer glass tube (103) being wrapped with a metal mesh (8), the discharge region (5) being between the inner wall of the outer glass tube (103) and the outer wall of the inner glass tube (102), characterized in that: It also includes two through-hole covers respectively located at the two ends of the outer glass tube (103), and tightly connected to the outer glass tube (103) to play a sealing role. A first motor handle (2) on one side passes through the first through-hole cover (4) and is fixedly connected to the inner glass tube (102). The other end of the first motor handle (2) is connected to the first motor. When driven by the first motor, the first motor handle (2) rotates, driving the inner glass tube (102) to rotate. The metal rod (11) passes through the second through-hole cover (10) at the other end and enters the inner glass tube (102). The outer wall of the inner glass tube (102) is spiral.

2. The rotary plasma seed treatment device according to claim 1, characterized in that: The motor has two parts, which are arranged in the motor case (1) and also include a second motor handle (3). The second motor handle (3) is fixedly connected to the first through-hole cover (4). The other end of the second motor handle (3) is connected to the second motor. When driven by the second motor, the second motor handle (3) rotates, driving the outer glass tube (103) to rotate.

3. The rotary plasma seed processing device according to claim 2, characterized in that: The first motor and the second motor rotate in opposite directions.

4. The rotary plasma seed treatment device according to claim 2, characterized in that: It also includes an elastic iron sheet (7), one end of which is fixed to the outside of the motor case (1), and the other end of which is tightly fitted to the metal mesh (8), and the iron sheet (7) and the metal mesh (8) together form a grounding electrode.

5. The rotary plasma seed processing device according to claim 4, characterized in that: One end of the elastic iron sheet (7) is a flat-head through-shaped screw hole, and one end of the elastic iron sheet (7) is fixed to the outside of the motor case (1) by means of screws.

6. The rotary plasma seed processing device according to any one of claims 1 to 5, characterized in that: The material of the metal mesh (8) and the metal rod (11) is a mixture of one or more of brass, tungsten, iron and stainless steel.

7. The rotating plasma seed processing device according to claim 5, characterized in that: The metal mesh (8) and the metal rod (11) are made of brass.

8. The rotary plasma seed processing device according to any one of claims 1 to 5, characterized in that: The high-voltage excitation source (12) is one of a nanosecond pulse power supply, a microsecond pulse power supply, and an alternating current power supply.

9. The rotating plasma seed processing device according to claim 8, characterized in that: The high-voltage excitation source (12) is a nanosecond pulse power source.

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