A core type low temperature plasma cloud purifying element

Abstract

This utility model discloses a core-electrode type low-temperature plasma cloud purification element, relating to the field of air purification technology. It includes an inner electrode, an outer electrode, a dielectric layer, and a high-voltage power supply. The inner and outer electrodes are coaxially arranged, with the dielectric layer located between them. The inner electrode is made of stainless steel wire and serves as the high-voltage electrode. The outer electrode is a thin-walled aluminum alloy electrode and serves as the grounding electrode, and it has a gas flow channel. The high-voltage power supply is an AC power supply, electrically connected to the inner electrode. This utility model, through its single-element structure, achieves a uniform electric field and long lifespan: the coaxial arrangement of the inner and outer electrodes, combined with the air dielectric layer, makes the electric field distribution more uniform, avoiding electrode damage caused by excessive local discharge; the dielectric layer isolates the electrodes from direct contact, further extending the element's lifespan; and ozone concentration is controllable: the dielectric barrier discharge precisely controls electron energy, suppressing ozone generation.

Description

Technical Field

[0001] This utility model belongs to the field of air purification technology, specifically relating to a core-type purification element based on low-temperature plasma technology. Background Technology

[0002] As people's demands for air quality increase, air purification technology has been widely adopted. Currently, mainstream air purification technologies include HEPA filtration, activated carbon adsorption, and UV photocatalysis. However, these technologies have significant drawbacks: HEPA filters rely on consumables, requiring frequent replacement and cannot decompose volatile organic compounds (VOCs); activated carbon adsorption is easily saturated, posing a risk of secondary pollution; and UV photocatalysis has low efficiency and limited effectiveness in treating complex pollutants.

[0003] Low-temperature plasma technology generates plasma clouds by ionizing air with a high-voltage electric field, which can efficiently decompose pollutants such as bacteria, viruses, formaldehyde, and benzene. It boasts advantages such as requiring no consumables and low energy consumption, making it a research hotspot in the field of air purification. However, existing low-temperature plasma purification elements have the following problems:

[0004] 1. An unreasonable electrode layout and uneven electric field distribution lead to excessive partial discharge, making the electrodes prone to corrosion, shortening their service life, and resulting in high ozone generation that exceeds indoor air quality standards and harms human health.

[0005] 2. The structure is fixed and cannot be adapted to purification equipment with different air volumes. It has poor versatility and high discharge temperature, posing a safety hazard. It is not suitable for highly flammable environments.

[0006] Therefore, there is an urgent need for a low-temperature plasma purification element that can solve the above problems. Utility Model Content

[0007] The purpose of this invention is to provide a core-type low-temperature plasma cloud purification element to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a core-electrode type low-temperature plasma cloud purification element, comprising an inner electrode, an outer electrode, a dielectric layer, and a high-voltage power supply; the inner electrode and the outer electrode are arranged coaxially, and the dielectric layer is located between the inner electrode and the outer electrode; the inner electrode is a stainless steel wire, serving as a high-voltage electrode; the outer electrode is a thin-walled aluminum alloy electrode, serving as a grounding electrode, and the outer electrode has a gas flow channel; the high-voltage power supply is an AC power supply, and the high-voltage power supply is electrically connected to the inner electrode, generating a low-temperature plasma cloud in the dielectric layer region through dielectric barrier discharge.

[0009] Furthermore, the dielectric layer is an air layer, used to prevent direct discharge between the inner and outer electrodes and to prevent the formation of an electric field.

[0010] Furthermore, the purified air flows axially through the medium layer to prolong the contact time between the air and the low-temperature plasma cloud.

[0011] Furthermore, the solution also includes a support assembly comprising a main support and a secondary support for fixing the relative positions of the inner and outer electrodes.

[0012] Furthermore, the discharge temperature of the low-temperature plasma cloud is 50°C.

[0013] Furthermore, the high-voltage power supply controls electron energy through dielectric barrier discharge, ensuring that ozone generation meets national indoor air quality standards.

[0014] Furthermore, the purification elements can be combined in series and / or parallel to form a purification module, which can be adapted to purification equipment with different air volumes.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] Through the structural design of individual components, this purification element has a uniform electric field and a long lifespan: the inner and outer electrodes are coaxially arranged, and together with the air dielectric layer, the electric field distribution is more uniform, avoiding electrode wear caused by excessive local discharge; the dielectric layer isolates the electrodes from direct contact, further extending the element's lifespan, and the ozone concentration is controllable: the electron energy is precisely controlled through dielectric barrier discharge to suppress ozone generation, meeting the GB / T18883-2022 indoor air quality standard, with no secondary pollution;

[0017] High versatility: The modular design allows for series / parallel connection, adapting to purification equipment with different air volumes. It is suitable for everything from small household equipment to large public equipment, and is safe and reliable. It can operate at low temperatures up to 50 degrees Celsius, making it suitable for highly flammable environments. The stainless steel and aluminum alloy electrode materials have strong corrosion resistance and are adaptable to complex environments.

[0018] The optimized gas flow channel design allows for full contact between air and the plasma cloud, where high-energy electrons and free radicals can efficiently oxidize and decompose pollutant molecules. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a single module structure of the purification element of this utility model;

[0020] Figure 2 This is a schematic diagram of the purification component module structure of this utility model.

[0021] In the diagram: 1. Main support; 2. Secondary support; 3. External electrode; 4. Internal electrode; 5. Electrode connection line; 6. Medium layer; 7. Main support end; 8. Secondary support end; 9. Return air section; 10. Purification element; 11. Air supply section. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] This utility model provides a core-type low-temperature plasma cloud purification element, including an inner electrode 4, an outer electrode 3, a dielectric layer 6, and a high-voltage power supply; the inner electrode 4 is made of stainless steel wire and serves as a high-voltage electrode, which has the characteristics of corrosion resistance and long service life; the outer electrode 3 is made of thin-walled aluminum alloy electrode and serves as a grounding electrode, which forms a gas flow channel inside, resulting in low wind resistance and improved purification efficiency.

[0024] The inner electrode 4 and the outer electrode 3 are arranged coaxially, and the dielectric layer 6 between them is made of air. It is used to block the direct discharge between the inner electrode 4 and the outer electrode 3 and to form a uniform electric field. The high voltage power supply is an AC power supply, and its output terminal is electrically connected to the inner electrode 4. A uniform low-temperature plasma cloud is generated in the region of the dielectric layer 6 through dielectric barrier discharge. The purified air flows through the dielectric layer 6 along the axis, so that the air can fully contact the low-temperature plasma cloud, prolong the residence time, and ensure thorough purification.

[0025] It should also be noted that the purification element 10 also includes a support assembly, which includes a main support 1 and a secondary support 2, used to fix the relative positions of the inner electrode 4 and the outer electrode 3 to ensure coaxiality. A single purification element is set between the main support end 7 and the secondary support end 8. The secondary support end 8 is provided with a return air section 9, and the main support end 7 is provided with an air supply section 11 to achieve airflow, which is powered by a fan.

[0026] It is also important to know about the above solutions that purification components can be combined in series and / or parallel to form purification modules, which can be adapted to purification equipment with different air volumes, such as small household purifiers, large public purification equipment, air conditioning and fresh air systems.

[0027] It is also important to know about the above solution that the discharge temperature of the purification element is <50℃ to avoid safety hazards caused by high temperature, and it is suitable for highly flammable environments.

[0028] It is also important to know about the above scheme that the high-voltage power supply controls the electron energy through dielectric barrier discharge, so that the ozone generation meets the GB / T18883-2022 indoor air quality standard.

[0029] Example 1:

[0030] The inner electrode 4 of the purification element is a stainless steel wire with a diameter of 0.5 mm, and the outer electrode 3 is an aluminum alloy tube with a wall thickness of 0.3 mm. The inner electrode 4 and the outer electrode 3 are arranged coaxially, and the dielectric layer 6 has a thickness of 5 mm. The high voltage power supply is an AC power supply with an output voltage of 7-10 kV.

[0031] The above-mentioned purification elements are integrated into the air duct of a household air purifier, with each element handling an air volume of 2-3 m³ / h. 3 / h, total air volume handled: 100-150m³ 3 / h. Test results show that PM2.5 removal rate >95%, formaldehyde decomposition rate >85%, and ozone concentration <0.05ppm, which meets the GB / T18883-2022 indoor air quality standard.

[0032] Example 2:

[0033] In this embodiment, the inner electrode 4 of the purification element is a stainless steel wire with a diameter of 0.8 mm, the outer electrode 3 is an aluminum alloy tube with a wall thickness of 0.5 mm, and the dielectric layer 6 has a thickness of 8 mm; the high voltage power supply parameters are the same as in Embodiment 1.

[0034] 400 of the above-mentioned purification elements are connected in series to form a purification module of 605×605×120mm, which is arranged in the duct section of a large commercial purification equipment. Each element can handle an air volume of 4-7m³. 3 / h, total air volume handled 3000m³ 3 / h. This module is compatible with central air conditioning systems in public spaces such as airports, train stations, and office buildings, and can effectively reduce the risk of disease transmission.

[0035] Example 3:

[0036] In this embodiment, the outer electrode 3 is made of stainless steel (suitable for high temperature, high humidity, acid and alkaline gas environments), the inner electrode 4 is a stainless steel wire with a diameter of 1.0 mm, and the dielectric layer 6 is 10 mm thick; multiple sets of elements are connected in series to form a purification assembly, which works with a catalytic filter to treat VOCs.

[0037] This component is suitable for heavily polluted environments such as biopharmaceutical plants, chemical enterprises, and welding stations, and has a processing efficiency of >90% for oxides, benzene, and strong special odors.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended embodiments and their equivalents.

Claims

1. A core-type low-temperature plasma cloud purification element, characterized by comprising: It includes an inner electrode, an outer electrode (3), a dielectric layer (6), and a high-voltage power supply; the inner electrode and the outer electrode (3) are arranged coaxially, and the dielectric layer (6) is located between the inner electrode and the outer electrode (3); The internal electrode is made of stainless steel wire and serves as a high-voltage electrode. The external electrode (3) is a thin-walled aluminum alloy electrode, which serves as a grounding electrode, and the external electrode (3) has a gas flow channel; The high-voltage power supply is an AC power supply, which is electrically connected to the inner electrode. It generates a low-temperature plasma cloud in the dielectric layer (6) region through dielectric barrier discharge.

2. The core-type low-temperature plasma cloud purification element according to claim 1, characterized by The dielectric layer (6) is an air layer, which is used to block the direct discharge between the inner electrode and the outer electrode (3) and to form an electric field.

3. The core-type low-temperature plasma cloud purification element according to claim 1, characterized by The purified air flows axially through the medium layer (6) to prolong the contact time between the air and the low-temperature plasma cloud.

4. The core-type low-temperature plasma cloud purification element according to claim 1, characterized by It also includes a support assembly, which includes a main support (1) and a secondary support (2) for fixing the relative positions of the inner electrode and the outer electrode (3).

5. The core-type low-temperature plasma cloud purification element according to claim 1, characterized by The discharge temperature of the low-temperature plasma cloud is <50℃.

6. The core-type low-temperature plasma cloud purification element according to claim 1, characterized by The high-voltage power supply controls electron energy through dielectric barrier discharge, ensuring that ozone generation meets national indoor air quality standards.

7. The core-type low-temperature plasma cloud purification element according to claim 1, characterized by The purification elements can be combined in series and / or in parallel to form a purification module, which can be adapted to purification equipment with different air volumes.

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