DBD plasma device for producing high-purity lithium oxide

Abstract

The utility model provides a kind of production high-purity lithium oxide's DBD plasma device, belong to plasma device technical field, solve the problem of the precise control of the spacing between upper and lower electrode plate and the precise temperature control of upper electrode plate cannot be realized in prior art.It includes hollow shell, lower electrode plate and upper electrode plate are arranged in parallel and are spaced apart in hollow shell, lifting support is provided on hollow shell, screw rod lifting drive mechanism is installed on lifting support, hollow screw rod is connected with movable seal, and hollow screw rod penetrates through hollow shell, the upper end of hollow screw rod is rotatably connected with first rotary pipe joint.By screw rod lifting drive mechanism drives the lifting of hollow screw rod, to drive the lifting of upper electrode plate, the spacing between upper and lower electrode plate is accurately adjusted, and first rotary pipe joint on hollow screw rod can transport coolant to hollow upper electrode plate, to maintain the stability of upper electrode plate temperature, ensure the generation effect of plasma and material processing efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of plasma device technology, specifically to a DBD plasma device for producing high-purity lithium oxide. Background Technology

[0002] DBD (Dielectric Barrier Discharge) plasma devices work by inserting an insulating medium (such as ceramic, glass, or quartz) between two electrodes and applying a high-frequency AC high voltage (typically AC380V, adjustable from 0-10kHz), causing the gas to break down under normal pressure to form a uniform and stable plasma. Its core mechanisms include: ① Electron avalanche effect: Gas near the cathode ionizes in the electric field, generating electrons. These electrons accelerate and collide with gas molecules, forming a chain reaction that produces a large number of free electrons and positive ions. ② Dielectric barrier effect: The insulating medium restricts the free growth of current, preventing arc or spark discharge, ensuring discharge uniformity, and extending equipment life. ③ Streamer discharge process: The discharge consists of three stages: breakdown, development, and disappearance, forming micro-discharge channels (tens to hundreds of nanometers in diameter), generating high-energy electrons, active particles (such as ozone and hydroxyl radicals), and ultraviolet light.

[0003] In the process of producing high-purity lithium oxide, lithium hydroxide is carried on the lower electrode plate of the DBD plasma device. Lithium hydroxide serves as both a dielectric layer and the material to be processed. Its solid-state insulation (melting point 462℃) allows it to accumulate charge and generate a reverse electric field, suppressing the electric arc and forming a pulsed micro-discharge (lasting 10–100 ns) to maintain the non-equilibrium plasma. High-energy electrons (3–10 eV) in the uniform glow between the positive and negative electrodes of the DBD plasma collide with LiOH, breaking the Li⁺-OH⁻ ionic bond and significantly reducing the decomposition temperature. By utilizing the heat storage of plasma irradiation and the heat conduction of hot oil for synergistic thermal decomposition, high-purity lithium oxide is generated at a lower temperature and lower voltage, with only non-polluting gas (water vapor) being emitted. The process is simple, requires no solvent or catalyst, avoids the generation of lithium peroxide at high temperatures, and produces high-purity products.

[0004] Existing DBD plasma devices cannot achieve precise control over the distance between the upper and lower electrodes, which may lead to uneven discharge, affecting plasma generation and processing efficiency. Furthermore, they cannot effectively control the temperature of the upper electrode. Excessive or insufficient temperature will adversely affect plasma generation and material processing. For example, excessively high temperatures may alter the properties of materials or even damage the device; while excessively low temperatures may fail to meet the conditions for plasma generation, affecting processing efficiency. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this invention is to provide a DBD plasma device for producing high-purity lithium oxide. A lead screw lifting mechanism drives the hollow lead screw to rise and fall, thereby adjusting the distance between the upper and lower electrode plates precisely. A first rotating pipe joint on the hollow lead screw can supply coolant to the hollow upper electrode plate, thus maintaining a stable temperature of the upper electrode plate and ensuring effective plasma generation and efficient material processing.

[0006] The technical solution adopted in this utility model is as follows: A DBD plasma device for producing high-purity lithium oxide includes a hollow shell. A lower electrode plate and an upper electrode plate are disposed parallel to each other within the hollow shell. A lifting support is provided on the hollow shell, and a screw lifting drive mechanism is mounted on the lifting support. The screw lifting drive mechanism is connected to a hollow screw that is movably sealed and penetrates the hollow shell. The upper electrode plate has a hollow structure and communicates with the hollow screw. A first rotary pipe joint is rotatably connected to the upper end of the hollow screw, and a first coolant delivery pipe is provided on the first rotary pipe joint.

[0007] Preferably, the hollow shell is connected to a support frame, and the lower electrode plate is connected to a hollow connecting rod that rotates and seals through the hollow shell. A pulley is fixedly sleeved on the hollow connecting rod, and a pulley motor is installed on the support frame. The pulley motor is connected to the pulley via a belt.

[0008] Preferably, the lower end of the hollow connecting rod is rotatably connected to a second rotary pipe joint, the second rotary pipe joint is provided with a hot oil conveying pipe, and the lower electrode plate is a hollow structure and communicates with the hollow connecting rod.

[0009] Preferably, the hollow shell has a movable seal through which a lead screw feeding tube and a lead screw suction tube extend into the lower electrode plate. The lead screw feeding tube and the lead screw suction tube are connected to a lead screw retraction drive mechanism for driving the lead screw feeding tube and the lead screw suction tube to move and being fixed on the support frame.

[0010] Preferably, the hollow shell is provided with an inert gas chamber, the inert gas chamber is connected to an inert gas delivery pipe, the inner wall of the hollow shell is provided with an arc-shaped gas outlet communicating with the inert gas chamber, the arc-shaped gas outlet is located below the lower electrode plate, and a negative pressure suction pipe located above the upper electrode plate is connected to the hollow shell.

[0011] Preferably, a water vapor sensor is installed in the negative pressure suction tube.

[0012] Preferably, the lower surface of the upper electrode plate is provided with several guide grooves, and the depth of the guide grooves increases sequentially from the axis of the upper electrode plate outward.

[0013] Preferably, the upper surface of the lower electrode plate is provided with a protrusion, which is an Archimedean spiral protrusion or several concentric ring protrusions at equal intervals.

[0014] Preferably, the hollow housing is provided with a temperature sensor for monitoring the temperature of the lower electrode plate.

[0015] Preferably, the hollow shell is provided with a cooling cavity, and the cooling cavity is connected to a second coolant delivery pipe.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: The hollow screw is driven to rise and fall by the screw lifting drive mechanism, thereby driving the upper electrode plate to rise and fall precisely to adjust the distance between the upper and lower electrode plates. The first rotating pipe joint on the hollow screw can deliver coolant to the hollow upper electrode plate, thereby maintaining the stability of the upper electrode plate temperature and ensuring the plasma generation effect and material processing efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model; Figure 2 A schematic diagram of the hollow shell structure provided in this embodiment of the utility model; Figure 3 A schematic diagram of the cross-sectional structure of the hollow shell provided in this embodiment of the utility model; Figure 4 This is a schematic diagram of the lower electrode plate structure provided in an embodiment of the present utility model; Figure 5 This is a schematic diagram of the upper electrode plate structure provided in an embodiment of the present utility model; Figure 6 A schematic diagram of the screw feeding tube and screw suction tube provided in the embodiments of this utility model.

[0019] Reference numerals: 1-Pulley motor; 2-Pulley; 3-Hollow shell; 4-Support frame; 5-Screw feeding pipe; 6-Screw suction pipe; 7-Screw retraction drive mechanism; 8-Observation window; 9-Lifting support; 10-Screw lifting drive mechanism; 11-Hollow screw; 12-Water vapor sensor; 13-Negative pressure suction pipe; 14-Cooling chamber; 15-Second coolant delivery pipe; 16-Second rotary pipe joint; 17-Hot oil delivery pipe; 18-Inert gas chamber; 19-Inert gas delivery pipe; 20-First rotary pipe joint; 21-First coolant delivery pipe; 22-Lower electrode plate; 23-Upper electrode plate; 24-Arc-shaped air outlet; 25-Hollow connecting rod; 26-Temperature sensor; 27-Protrusion; 28-Guide groove; 29-Feeding port; 30-Scraper; 31-Suction port. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] The following is combined Figures 1-6 This utility model will be described in detail.

[0024] Example A DBD plasma device for producing high-purity lithium oxide includes a hollow shell 3. A lower electrode plate 22 and an upper electrode plate 23 are disposed parallel to each other within the hollow shell 3. A lifting support 9 is provided on the hollow shell 3, and a screw lifting drive mechanism 10 is installed on the lifting support 9. The screw lifting drive mechanism 10 is connected to a hollow screw 11 that is movably sealed and penetrates the hollow shell 3. The upper electrode plate 23 has a hollow structure and is connected to the hollow screw 11. A first rotary pipe joint 20 is rotatably connected to the upper end of the hollow screw 11, and a first coolant delivery pipe 21 is provided on the first rotary pipe joint 20.

[0025] The hollow lead screw 11 is driven to rise and fall by the lead screw lifting drive mechanism 10, thereby driving the upper electrode plate 23 to rise and fall precisely to adjust the distance between the upper electrode plate 23 and the lower electrode plate 22. The first rotary pipe joint 20 on the hollow lead screw 11 can supply coolant to the hollow upper electrode plate 23 through the first coolant delivery pipe 21, thereby maintaining the temperature stability of the upper electrode plate 23 (coolant is circulated when the temperature is high, and the supply of coolant is stopped or a small amount is supplied when the temperature is low), ensuring the plasma generation effect and material processing efficiency. The first rotary pipe joint 20 also allows the hollow lead screw 11 to remain connected to the first coolant delivery pipe 21 during the rising and falling process. There are two first coolant delivery pipes 21, one for supplying coolant and the other for supplying coolant. The lower electrode plate 22 and the upper electrode plate 23 are connected to a high-frequency power supply (not shown in the figure) for discharge operation. The side walls of the lower electrode plate 22 and the upper electrode plate 23 are 5-15 cm away from the inner wall of the hollow shell 3.

[0026] The hollow shell 3 is connected to a support frame 4. The lower electrode plate 22 is connected to a hollow connecting rod 25 that passes through the hollow shell 3 and has a rotating seal. A pulley 2 is fixedly sleeved on the hollow connecting rod 25. A pulley motor 1 is installed on the support frame 4. The pulley motor 1 is connected to the pulley 2 via a belt. The pulley motor 1 drives the pulley 2 to rotate via the belt, which causes the hollow connecting rod 25 to drive the lower electrode plate 22 to rotate, thereby facilitating the fabric laying operation.

[0027] The lower end of the hollow connecting rod 25 is rotatably connected to a second rotary pipe joint 16, on which a hot oil delivery pipe 17 is installed. The lower electrode plate 22 is hollow and connected to the hollow connecting rod 25. Two hot oil delivery pipes 17 are provided, one for supplying hot oil and the other for supplying hot oil. The second rotary pipe joint 16 ensures that the hot oil delivery pipe 17 remains connected to the hollow lower electrode plate 22 during the rotation of the hollow connecting rod 25, thereby achieving precise temperature control of the lower electrode plate 22 and avoiding adverse effects on plasma generation and material processing due to temperature issues.

[0028] The hollow shell 3 has a movable seal through its side wall, through which a lead screw feeding tube 5 and a lead screw suction tube 6 extend above the lower electrode plate 22. The lead screw feeding tube 5 and the lead screw suction tube 6 are connected to a lead screw retraction drive mechanism 7, which drives the movement of the lead screw feeding tube 5 and the lead screw suction tube 6 and is fixed to the support frame 4. The lower surface of the lead screw feeding tube 5 has a feeding port 29, and a scraper 30 is also connected to the lower surface of the lead screw feeding tube 5. The scraper 30 can level the lithium hydroxide powder. The lower surface of the lead screw suction tube 6 has a suction port 31. During the rotation of the lower electrode plate 22, the lead screw retraction drive mechanism 7 drives the lead screw feeding tube 5 to move, thereby evenly distributing the lithium hydroxide on the lower electrode plate 22. When outputting lithium oxide, the lead screw retraction drive mechanism 7 drives the lead screw suction tube 6 to move, cooperating with the rotation of the lower electrode plate 22 to suck all the lithium oxide out of the hollow shell 3.

[0029] The aforementioned lead screw retraction drive mechanism 7 and lead screw lifting drive mechanism 10 are both turbine lead screw drive mechanisms (turbine lead screw drive mechanisms are existing technology). During the driving process of the turbine lead screw drive mechanism, the lead screw only moves axially and does not rotate.

[0030] An inert gas chamber 18 is provided on the hollow shell 3, and an inert gas delivery pipe 19 is connected to the inert gas chamber 18. An arc-shaped gas outlet 24 communicating with the inert gas chamber 18 is provided on the inner wall of the hollow shell 3. The arc-shaped gas outlet 24 is located below the lower electrode plate 22. A negative pressure suction pipe 13 located above the upper electrode plate 23 is connected to the hollow shell 3. An intake gas pump (not shown in the figure) delivers inert gas to the hollow shell 3 through the inert gas delivery pipe 19, the inert gas chamber 18 and the arc-shaped gas outlet 24. An exhaust gas pump (not shown in the figure) draws the gas out of the hollow shell 3 through the negative pressure suction pipe 13, thereby maintaining the gas pressure in the hollow shell 3 and timely removing water vapor from the hollow shell 3, reducing the probability of short circuit of the electrode plate due to water vapor accumulation. The inert gas re-enters the hollow shell 3 after dehydration and drying. Among them, the arc-shaped air outlet 24 is located 1-5cm below the lower electrode plate 22 in the vertical direction; there are two arc-shaped air outlets 24 arranged opposite each other, and the arc length of the arc-shaped air outlet 24 is one-third of the arc length of the lower electrode plate 22.

[0031] A water vapor sensor 12 is installed in the negative pressure suction pipe 13. The water vapor sensor 12 can be an AHS01IB type water vapor sensor from Auson Electronics. The water vapor sensor 12 detects the water vapor content in the discharged hollow shell 3. When the water vapor content is high, the intake air pump and the extraction air pump are controlled to change frequency in real time to ensure that the water vapor is extracted in time.

[0032] Several guide grooves 28 are formed on the lower surface of the upper electrode plate 23. The depth of the guide grooves 28 increases sequentially from the axis of the upper electrode plate 23 outwards, that is, the guide grooves 28 are inclined upwards. The guide grooves 28 are arranged radially along the upper electrode plate 23 and 3-5 are evenly distributed circumferentially along the upper electrode plate 23. The guide grooves 28 can guide the airflow to diffuse rapidly, so that the airflow is evenly distributed in the hollow shell 3, thereby improving the contact effect between plasma and materials.

[0033] The upper surface of the lower electrode plate 22 is provided with protrusions 27, which are either Archimedean spiral protrusions or several equally spaced concentric ring protrusions. The Archimedean spiral protrusions or several equally spaced concentric ring protrusions overcome the uniformity bottleneck of traditional DBD through geometrically induced discharge, achieving tangential electric field gain and increasing electron density. Combined with the forced vortex airflow caused by the rotation of the lower electrode plate 22, the residence time of active particles is extended. When using Archimedean spiral protrusions, the height of the protrusion smoothly decreases from the last 10-15cm to 0 at the end of the spiral. The spiral curvature disperses the electric field, significantly increasing the breakdown voltage threshold. The smooth decrease in height at the tail of the spiral avoids excessively high local electron energy density. The Archimedean spiral protrusions or several equally spaced concentric ring protrusions are arranged in 3-10 turns, with a protrusion height of 0-3cm. The spacing of the protrusions 27 is consistent with the width of the fabric opening 29.

[0034] A temperature sensor 26 is installed on the hollow shell 3 to monitor the temperature of the lower electrode plate 22. The temperature sensor 26 monitors the temperature of the lower electrode plate 22 and is linked with the hot oil delivery system of the lower electrode plate 22 (not shown in the figure) to prevent the local temperature of the lower electrode plate 22 from exceeding 450°C and to avoid lithium hydroxide melting.

[0035] A cooling chamber 14 is provided on the hollow shell 3, and the cooling chamber 14 is connected to a second coolant delivery pipe 15. The two second coolant delivery pipes 15 are used for supplying and discharging coolant, respectively; the number and installation position of the cooling chambers 14 can be selected according to requirements. The cooling chambers 14 control the temperature of the hollow shell 3.

[0036] Two observation windows 8 are provided on the hollow shell 3 to facilitate observation of the internal condition of the hollow shell 3.

[0037] The operation of this device is as follows: During the feeding process, the upper electrode plate 23 rises, and the lead screw retraction drive mechanism 7 controls the feeding port 29 of the lead screw feeding tube 5 to move from the outside to the inside along the protrusion line of the lower electrode plate 22. At the same time, the lower electrode plate 22 rotates in coordination. The feeding speed, the rotation speed of the lower electrode plate 22 and the height of the scraper 30 are adjusted to control the feeding thickness. The scraper 30 adjusts the feeding height while ensuring the flatness of the feeding. After the feeding is completed, the upper electrode plate 23 descends to a certain height and, together with the rotation of the lower electrode plate 22, processes the lithium hydroxide. After processing, the upper electrode plate 23 rises, and the lead screw suction tube 6 transports the high-purity lithium oxide to the cooling chamber through the suction port 31.

[0038] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A DBD plasma device for producing high-purity lithium oxide, comprising a hollow shell (3), wherein a lower electrode plate (22) and an upper electrode plate (23) are disposed therein in parallel spaced apart, characterized in that, The hollow shell (3) is provided with a lifting support (9), and a screw lifting drive mechanism (10) is installed on the lifting support (9). The screw lifting drive mechanism (10) is connected to a hollow screw (11) that is movably sealed and penetrates the hollow shell (3). The upper electrode plate (23) is hollow and communicates with the hollow screw (11). The upper end of the hollow screw (11) is rotatably connected to a first rotary pipe joint (20), and a first coolant delivery pipe (21) is provided on the first rotary pipe joint (20).

2. The DBD plasma device for producing high-purity lithium oxide according to claim 1, characterized in that, The hollow shell (3) is connected to a support frame (4), and the lower electrode plate (22) is connected to a hollow connecting rod (25) that rotates and seals through the hollow shell (3). A pulley (2) is fixedly sleeved on the hollow connecting rod (25), and a pulley motor (1) is installed on the support frame (4). The pulley motor (1) is connected to the pulley (2) via a belt.

3. The DBD plasma device for producing high-purity lithium oxide according to claim 2, characterized in that, The lower end of the hollow connecting rod (25) is rotatably connected to a second rotary pipe joint (16), and a hot oil conveying pipe (17) is provided on the second rotary pipe joint (16). The lower electrode plate (22) is a hollow structure and is connected to the hollow connecting rod (25).

4. The DBD plasma apparatus for producing high-purity lithium oxide according to claim 2, characterized in that, The hollow shell (3) has a movable seal through the side wall, through which a screw feeding tube (5) and a screw suction tube (6) extend into the lower electrode plate (22). The screw feeding tube (5) and the screw suction tube (6) are connected to a screw retraction drive mechanism (7) for driving the screw feeding tube (5) and the screw suction tube (6) to move and fixed on the support frame (4).

5. The DBD plasma apparatus for producing high-purity lithium oxide according to claim 1, characterized in that, An inert gas chamber (18) is provided on the hollow shell (3), and an inert gas delivery pipe (19) is connected to the inert gas chamber (18). An arc-shaped gas outlet (24) communicating with the inert gas chamber (18) is provided on the inner wall of the hollow shell (3). The arc-shaped gas outlet (24) is located below the lower electrode plate (22). A negative pressure suction pipe (13) located above the upper electrode plate (23) is connected to the hollow shell (3).

6. The DBD plasma apparatus for producing high-purity lithium oxide according to claim 5, characterized in that, A water vapor sensor (12) is installed in the negative pressure suction tube (13).

7. The DBD plasma apparatus for producing high-purity lithium oxide according to claim 1, characterized in that, The lower surface of the upper electrode plate (23) is provided with several guide grooves (28), and the depth of the guide grooves (28) increases sequentially from the axis of the upper electrode plate (23) outward.

8. The DBD plasma apparatus for producing high-purity lithium oxide according to claim 1, characterized in that, The upper surface of the lower electrode plate (22) is provided with a protrusion (27), which is an Archimedean spiral protrusion or several concentric ring protrusions with equal spacing.

9. A DBD plasma apparatus for producing high-purity lithium oxide according to claim 1, characterized in that, A temperature sensor (26) for monitoring the temperature of the lower electrode plate (22) is provided on the hollow shell (3).

10. A DBD plasma apparatus for producing high-purity lithium oxide according to claim 1, characterized in that, The hollow shell (3) is provided with a cooling chamber (14), and the cooling chamber (14) is connected to a second coolant delivery pipe (15).

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