Bladeless air sterilization device based on plasma flow control

Abstract

This invention discloses a bladeless air sterilization device based on plasma flow control, comprising an induced airflow array and a plasma sterilization array arranged sequentially along the airflow direction. The induced airflow array consists of several SDBD (Solid State Difference) units, and the plasma sterilization array consists of several DBD (Deep State Difference) units. Each SDBD unit includes an SDBD unit dielectric layer, within which an SDBD unit high-voltage electrode is embedded, and an SDBD unit grounding electrode is disposed outside the SDBD unit dielectric layer. Each DBD unit includes two DBD unit dielectric layers, within which a DBD unit grounding electrode and a DBD unit high-voltage electrode are respectively embedded. This bladeless air sterilization device uses an induced airflow array instead of a bladed device, simplifying the structure and reducing costs; the high-voltage electrode is embedded in the dielectric layer, increasing safety; and multi-stage sterilization improves the sterilization rate.

Description

Technical Field

[0001] This invention belongs to the field of air purification device technology, and relates to a bladeless air sterilization device based on plasma flow control. Background Technology

[0002] Airborne pathogens are easily spread among people, potentially causing pandemics and posing a threat to society. Therefore, it is essential to develop and improve a highly efficient air sterilization and disinfection device.

[0003] Current sterilization and disinfection technologies can be categorized into static air disinfection and dynamic air purification disinfection methods based on airflow. Static air disinfection mainly includes ultraviolet disinfection, ozone disinfection, and chemical disinfection. These methods are thorough and technologically mature, but require a long sterilization time. Chemical disinfection can damage and corrode items and cannot be used in conjunction with human-machine interaction. Dynamic air purification disinfection allows for human-machine interaction and is more suitable for densely populated areas. It primarily includes laminar flow air purification and plasma air disinfection. Laminar flow air purification offers highly efficient filtration but is too costly for large-scale commercial applications. Plasma air disinfection is a novel sterilization method that, compared to traditional methods, can kill one or even several orders of magnitude more microorganisms in a short time.

[0004] There are various ways to generate plasma, among which dielectric barrier discharge (DBD) has been widely used in sterilization and disinfection because it can produce uniform discharge at atmospheric pressure. In addition, surface dielectric barrier discharge (SDBD), when arranged asymmetrically, can generate induced airflow of up to 10 m / s, attracting much attention in flow control domains. Summary of the Invention

[0005] The purpose of this invention is to provide a bladeless air sterilization device based on plasma flow control, which solves the problems of low efficiency, high cost and low safety in existing air sterilization devices.

[0006] The technical solution adopted in this invention is a bladeless air sterilization device based on plasma flow control, comprising an induced airflow array and a plasma sterilization array arranged sequentially along the airflow direction. The induced airflow array is composed of several SDBD units, and the plasma sterilization array is composed of several DBD units.

[0007] Each SDBD unit includes an SDBD unit dielectric layer, an SDBD unit high voltage electrode is buried inside the SDBD unit dielectric layer, and an SDBD unit grounding electrode is provided outside the SDBD unit dielectric layer.

[0008] Each DBD unit includes two DBD unit dielectric layers, and the DBD unit grounding electrode and the DBD unit high voltage electrode are respectively buried inside the two DBD unit dielectric layers.

[0009] The invention is further characterized by:

[0010] Both the SDBD unit dielectric layer and the DBD unit dielectric layer are made of polytetrachloroethylene.

[0011] The thickness d3 of both the SDBD cell dielectric layer and the DBD cell dielectric layer is 1mm to 4mm.

[0012] The length L2 of the high-voltage electrode of the SDBD unit is not less than 5mm.

[0013] The length L1 of the SDBD unit grounding electrode is 2mm to 10mm.

[0014] The length L3 of both the DBD unit grounding electrode and the DBD unit high-voltage electrode is 5mm to 20mm.

[0015] The distance between two adjacent SDBD cell dielectric layers and the distance d1 between two adjacent DBD cell dielectric layers are both 1mm to 5mm.

[0016] The distance d2 between two adjacent SDBD units is 15mm to 40mm.

[0017] The beneficial effects of this invention are:

[0018] (1) The bladeless air sterilization device of the present invention combines the characteristics of SDBD and DBD, and applies multi-stage sterilization to improve sterilization efficiency.

[0019] (2) The bladeless air sterilization device of the present invention has buried the high voltage electrode and the exposed electrode is the grounding electrode, which improves the safety of the equipment.

[0020] (3) The bladeless air sterilization device of the present invention does not require a fan blade device, which reduces the cost of the device and simplifies the structure of the device. Attached Figure Description

[0021] Figure 1 This is a cross-sectional structural diagram of the bladeless air sterilization device of the present invention.

[0022] In the figure, 1. Induced airflow array, 1-1. SDBD unit ground electrode, 1-2. SDBD unit high voltage electrode, 1-3. SDBD unit, 1-4. SDBD unit dielectric layer;

[0023] 2. Plasma sterilization array, 2-1. DBD unit grounding electrode, 2-2. DBD unit high voltage electrode, 2-3. DBD unit, 2-4. DBD unit dielectric layer, 2-5. Plasma. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0025] This invention relates to a bladeless air sterilization device based on plasma flow control, such as... Figure 1 As shown, the device includes an induced airflow array 1 and a plasma sterilization array 2 arranged sequentially along the airflow direction. The induced airflow array 1 consists of several SDBD units 1-3. Replacing the traditional fan blades with SDBD units 1-3 improves the reliability of the device, simplifies the air sterilization device, and increases the contact time between plasma and air, applying multi-stage sterilization to the air and improving the sterilization rate. The plasma sterilization array 2 is composed of several DBD units 2-3; each SDBD unit 1-3 includes an SDBD unit dielectric layer 1-4, an SDBD unit high-voltage electrode 1-2 is buried inside the SDBD unit dielectric layer 1-4, the SDBD unit high-voltage electrode 1-2 is buried at the center of the SDBD unit dielectric layer 1-4, and an SDBD unit grounding electrode 1-1 is provided outside the SDBD unit dielectric layer 1-4; each DBD unit 2-3 includes two DBD unit dielectric layers 2-4, and a DBD unit grounding electrode 2-1 and a DBD unit high-voltage electrode 2-2 are buried inside the two DBD unit dielectric layers 2-4 respectively, and the DBD unit grounding electrode 2-1 and the DBD unit high-voltage electrode 2-2 are buried at the center of the two DBD unit dielectric layers 2-4 respectively. The SDBD unit high-voltage electrode 1-2 and the DBD unit high-voltage electrode 2-2 are connected to the high-voltage end of the high-voltage AC power supply. The SDBD unit grounding electrode 1-1 and the DBD unit grounding electrode 2-1 are connected to the low-voltage end of the high-voltage AC power supply, and the low-voltage end is grounded. The peak-to-peak value of the applied voltage of the AC power supply is 5kV to 20kV.

[0026] Both SDBD unit dielectric layer 1-4 and DBD unit dielectric layer 2-4 are made of polytetrachloroethylene, or other insulating materials with lower dielectric constants; the thickness d3 of both SDBD unit dielectric layer 1-4 and DBD unit dielectric layer 2-4 is 1mm to 4mm; the distance d1 between two adjacent SDBD unit dielectric layers 1-4 and between two adjacent DBD unit dielectric layers 2-4 is 1mm to 5mm.

[0027] The length L2 of the high-voltage electrode 1-2 of the SDBD unit is not less than 5mm, and the length L1 of the grounding electrode 1-1 of the SDBD unit is 2mm to 10mm. The distance d2 between two adjacent SDBD units 1-3 is 15mm to 40mm.

[0028] The length L3 of both the DBD unit grounding electrode 2-1 and the DBD unit high voltage electrode 2-2 is 5mm to 20mm.

[0029] This invention relates to a bladeless air sterilization device based on plasma flow control, the working process of which is as follows:

[0030] Air enters the bladeless air sterilization device through one end of the induced airflow array 1. The induced airflow array 1 consists of several SDBD units 1-3, which generate an induced airflow from left to right and perform a single sterilization of the air. Each SDBD unit consists of an exposed SDBD unit ground electrode 1-1 and an SDBD unit high-voltage electrode 1-2 buried in an SDBD unit dielectric layer 1-4. The horizontal distance between the SDBD unit ground electrode 1-1 and the SDBD unit high-voltage electrode 1-2 is -1mm to 1mm. The plasma sterilization array 2 consists of several DBD units 2-3. Each DBD unit 2-3 consists of a pair of DBD unit grounding electrodes 2-1 and DBD unit high-voltage electrodes 2-2 of equal length, and the two electrodes are arranged flush. When the device is in the start-up state, a uniformly distributed plasma 2-5 can be generated between the DBD unit grounding electrode 2-1 and the DBD unit high-voltage electrode 2-2. The plasma performs secondary sterilization on the air entering the induced airflow array 1. The fresh air after secondary sterilization is finally discharged from the other end of the plasma sterilization array 2.

[0031] The bladeless air sterilization device of this invention uses multiple sets of SDBD arrays to generate induced airflow, thereby replacing the traditional blade device, simplifying the structure of the sterilization device and improving the reliability of the sterilization system; moreover, all high-voltage electrodes are buried in the dielectric layer, which greatly increases the safety of plasma sterilization and disinfection; and multi-stage sterilization is adopted to further improve the sterilization rate.

Claims

1. A bladeless air sterilization device based on plasma flow control, characterized by, The device comprises an induced air flow array (1) and a plasma sterilization array (2) arranged in sequence along the air flow direction, the induced air flow array (1) is composed of several SDBD units (1-3), and the plasma sterilization array (2) is composed of several DBD units (2-3); Each SDBD unit (1-3) comprises an SDBD unit dielectric layer (1-4) with an SDBD unit high-voltage electrode (1-2) embedded therein, and an SDBD unit grounding electrode (1-1) arranged outside the SDBD unit dielectric layer (1-4); Each DBD unit (2-3) comprises two DBD unit dielectric layers (2-4) with a DBD unit grounding electrode (2-1) and a DBD unit high-voltage electrode (2-2) embedded therein, respectively; The SDBD unit dielectric layer (1-4) and the DBD unit dielectric layer (2-4) are both made of polytetrafluoroethylene material; The thickness d3 of the SDBD unit dielectric layer (1-4) and the DBD unit dielectric layer (2-4) is 1mm~4mm; The length L2 of the SDBD unit high-voltage electrode (1-2) is not less than 5mm; The length L1 of the SDBD unit grounding electrode (1-1) is 2mm~10mm; The length L3 of the DBD unit grounding electrode (2-1) and the DBD unit high-voltage electrode (2-2) is 5mm~20mm.

2. The bladeless air sterilizing apparatus according to claim 1, wherein The distance d1 between the adjacent two SDBD unit dielectric layers (1-4) and the distance between the adjacent two DBD unit dielectric layers (2-4) is 1mm~5mm.

3. The bladeless air sterilizing apparatus according to claim 1, wherein The distance d2 between the adjacent two SDBD units (1-3) is 15mm~40mm.

Images