Plasma air sterilization device based on external alternating electric field

Abstract

The invention belongs to the technical field of plasma sterilization, and relates to a plasma air sterilization device based on an external alternating electric field. Air inlets and outlets are formed in the two ends of an earth pole body shell, a high-voltage pole tube and an insulating medium tube are coaxially arranged inside and outside, and the two ends of the insulating medium tube are installed in the earth pole body shell through insulating supporting frames; a high-voltage pole rod is arranged in the high-voltage pole tube in a penetrating mode, a high-voltage connecting spring piece is arranged on the high-voltage pole rod in a penetrating mode, and a first high-voltage pole sealing fastening nut and an insulating spacer sleeve which abut against the end of the insulating supporting frame are sequentially arranged on the high-voltage pole rod extending out of the other end from inside to outside. The insulating spacer sleeve is sleeved with a flange plate fixed through a spacer sleeve fastening nut, the flange plate is connected with the earth pole body shell through a flange fastening screw, and a second high-voltage pole sealing fastening nut installed on the high-voltage pole rod is arranged outside the insulating spacer sleeve. The device has the advantages of being simple in structure, good in sterilization effect, low in sterilization cost, convenient to process and use and easy to implement.

Description

Technical Field

[0001] The invention belongs to the technical field of plasma sterilization, in particular to a plasma air sterilization device based on an externally applied alternating electric field. Background Art

[0002] Plasma sterilization technology is a new generation of high-tech sterilization technology, which can overcome some limitations and shortcomings of existing sterilization methods and improve the disinfection and sterilization effect.

[0003] The physical principles of existing plasma sterilization technology can be roughly divided into DC electrostatic field sterilization technology and DC negative high voltage (tip discharge) sterilization technology.

[0004] The DC electrostatic field sterilization technology releases negative charges into the air to be sterilized by setting negative high voltage. The negative charges adhere to the bacteria. When they pass through the electrostatic field, the negatively charged bacteria will be adsorbed on the positive plate, thus releasing sterile air. However, due to the limited number of bacteria adsorbed on the positive plate, the sterilization effect of this technology is not good.

[0005] Direct current negative high voltage (tip discharge) sterilization technology: It is necessary to make a tip on the electrode plate, and then discharge the tip by applying negative high voltage. The electrons released by the tip instantly knock away the outermost electrons of the air to form a plasma. We assume that the plasma under each tip is spindle-shaped. When the bacteria in the air pass through the spindle-shaped plasma, the bacteria can instantly react with oxygen to generate carbon dioxide and water, achieving the sterilization effect. However, the length of each plasma is limited, and it cannot contact the ground electrode plate, otherwise there will be a short circuit problem. Therefore, the bacteria passing through its air gap (the gap between the high-voltage electrode plate and the ground electrode plate for air to pass through) cannot be completely disinfected. In order to ensure the sterilization effect, a high-efficiency filter needs to be added to the rear of the sterilization device in the later stage, which increases the sterilization cost; in addition, setting a tip on the electrode plate also has the problem of inconvenient processing.

[0006] In view of this, the present invention proposes a plasma air sterilization device based on an external alternating electric field to solve the problems existing in the prior art such as poor sterilization effect, high cost, and difficulty in implementation. Summary of the invention

[0007] The purpose of the present invention is to provide a plasma air sterilization device based on an external alternating electric field, which has a scientific and reasonable structural design, a simple structure, a good sterilization effect, a low sterilization cost, is convenient to process and use, and is easy to implement.

[0008] The present invention solves the technical problem by the following technical solutions:

[0009] A plasma air sterilization device based on an external alternating electric field is characterized in that it includes a ground pole body shell, an insulating support frame, an insulating medium tube, a high-voltage pole tube, a high-voltage pole rod, a high-voltage connecting spring sheet, a high-voltage pole sealing and fastening insulating nut, a connecting spring, a first high-voltage pole sealing and fastening nut, an insulating spacer sleeve, a flange, a flange fastening screw, a spacer sleeve fastening nut and a second high-voltage pole sealing and fastening nut, air inlets and outlets are respectively arranged at both ends of the ground pole body shell, the high-voltage pole tube and the insulating medium tube are nested inside and outside and coaxially arranged, the two ends of the insulating medium tube are coaxially supported and installed inside the ground pole body shell through the insulating support frame, the two insulating support frames are located between the two air inlets and outlets, the gap between the insulating medium tube and the ground pole body shell forms a disinfection air gap, and the air inlet and outlet are formed in the high-voltage pole tube. A high-voltage pole is passed through the shaft, and a high-voltage connecting spring sheet is passed through the high-voltage pole. The outer ring of the high-voltage connecting spring sheet abuts against the high-voltage pole tube. Both ends of the high-voltage pole extend from the insulating support frames at both ends. A high-voltage pole sealing and fastening insulating nut is installed on the high-voltage pole extending at one end. The high-voltage pole sealing and fastening insulating nut is connected to the earth pole body shell through a connecting spring. The high-voltage pole extending at the other end is sequentially installed with a first high-voltage pole sealing and fastening nut abutting against the end of the insulating support frame and a T-shaped insulating spacer sleeve from the inside to the outside. A flange fixed by a spacer sleeve fastening nut is mounted on the insulating spacer sleeve. The flange is connected to the earth pole body shell through a flange fastening screw. A second high-voltage pole sealing and fastening nut installed on the high-voltage pole is provided on the outside of the insulating spacer sleeve.

[0010] Moreover, the earth pole body shell is a stainless steel one-piece structure, which includes an earth pole tube body, an end plate arranged at one end of the earth pole tube body, the outer diameter of the end plate is greater than or equal to the outer diameter of the earth pole tube body, a connecting boss for installing a connecting spring is arranged at the middle position of the inner side of the end plate, and a flange structure that is flanged outward is provided at the other end of the earth pole tube body, and flange holes connected to the flange plate are arranged at intervals on the flange structure, and the air inlet and outlet are arranged at both ends of the tube body of the earth pole tube body.

[0011] Moreover, the insulating support frame is composed of a disc support part and a cylindrical insertion part. The cylindrical insertion part is coaxially arranged at the inner center position of the disc support part. The cylindrical insertion part is inserted into the end of the high-voltage pole tube. Air-passing notches are arranged at intervals on the outer edge of the disc support part, and a through hole for inserting the high-voltage pole is provided in the middle of the cylindrical insertion part.

[0012] Moreover, the high-voltage pole is composed of a high-voltage pole body and a high-voltage pole top connecting rod body. The high-voltage pole body is installed on an insulating support frame, and the high-voltage pole top connecting rod body is installed in an insulating spacer sleeve.

[0013] Moreover, the high-voltage connecting spring sheet is formed by bending a spring sheet, including a vertical penetration portion and upwardly inclined connecting portions at the upper and lower ends of the vertical penetration portion. The vertical penetration portion is penetrated on the high-voltage pole through a through-hole arranged in the middle thereof, and high-voltage connecting spring sheet fastening nuts threadedly connected to the high-voltage pole are arranged at both ends of the vertical penetration portion, and the two connecting portions are crimped on the inner wall of the high-voltage pole tube.

[0014] Moreover, it also comprises a sealing gasket, which is sandwiched between the earth pole body shell and the flange, and the sealing gasket is sleeved on the insulating spacer sleeve.

[0015] The advantages and beneficial effects of the present invention are:

[0016] 1. This plasma sterilization device based on an applied alternating electric field, by designing the existing DC electrostatic field sterilization technology and DC negative high voltage (tip discharge) sterilization technology as a dielectric barrier discharge structure based on an alternating electric field, when the high voltage pole applies an alternating voltage greater than or equal to 2000V multiplied by the thickness of the disinfection air gap (in millimeters), an alternating electric field greater than or equal to 2000v / mm can be formed in the disinfection air gap, and the electric field can ionize the air to generate plasma. When air passes through the disinfection air gap of this device, under the plasma state, viruses and bacteria in the air will instantly react with oxygen in the air to generate carbon dioxide and water, which plays a role in efficient sterilization. The single disinfection rate of the present invention is greater than 99.99%.

[0017] 2. The plasma air sterilization device based on an external alternating electric field facilitates the assembly of the entire device and improves the assembly efficiency by designing the high-voltage pole as a two-section structure consisting of a high-voltage pole body and a second high-voltage pole.

[0018] 3. The structural design of the present invention is scientific and reasonable, and has the advantages of simple structure, good sterilization effect, low sterilization cost, convenient processing and use, and easy implementation. It is a highly innovative plasma air sterilization device based on an external alternating electric field. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 is a cross-sectional view of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the insulating support frame of the present invention;

[0022] Figure 4 It is a schematic structural diagram of the high-voltage connecting spring sheet of the present invention.

[0023] Reference numerals

[0024] 1-end plate, 2-ground pole body shell, 3-air inlet and outlet, 4-flange, 5-flange fastening nut, 6-spacer sleeve fastening nut, 7-second high-voltage pole sealing fastening nut, 8-high-voltage pole top connecting rod body, 9-connecting boss, 10-connecting spring, 11-high-voltage pole sealing fastening insulating nut, 12-insulating support frame, 13-high-voltage pole body, 14-high-voltage connecting spring sheet, 15-insulating medium pipe, 16-high-voltage pole pipe, 17-flange fastening screw, 18-insulating spacer sleeve, 19-first high-voltage pole sealing fastening nut, 20-disinfection air gap, 21-high-voltage connecting spring sheet fastening nut, 22-sealing gasket, 23-disc support part, 24-cylindrical insertion part, 25-connecting part, 26-vertical penetration part. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0026] A plasma air sterilization device based on an external alternating electric field, the innovation of which lies in: comprising a ground pole body shell 2, an insulating support frame 12, an insulating medium tube 15, a high-voltage pole tube 16, a high-voltage pole rod, a high-voltage connecting spring sheet 14, a high-voltage pole sealing and fastening insulating nut 11, a connecting spring 10, a first high-voltage pole sealing and fastening nut 19, an insulating spacer sleeve 18, a flange 4, a flange fastening screw 17, a spacer sleeve fastening nut 6 and a second high-voltage pole sealing and fastening nut 7, air inlets and outlets 3 are respectively arranged at both ends of the ground pole body shell for air to enter for sterilization and to be discharged after sterilization, the high-voltage pole tube and the insulating medium tube are nested inside and outside and coaxially arranged, the insulating medium tube is made of quartz glass, ceramics and other insulating materials, the two ends of the insulating medium tube are coaxially supported and installed inside the ground pole body shell through insulating support frames, the two insulating support frames are located between the two air inlets and outlets, and the insulating medium tube is outside the ground pole body. The gap between the shells forms a sterilizing air gap 20, a high-voltage pole is coaxially installed in the high-voltage pole tube, a high-voltage connecting spring sheet is installed on the high-voltage pole, the outer ring of the high-voltage connecting spring sheet abuts on the high-voltage pole tube, both ends of the high-voltage pole are extended from the insulating support frames at both ends, a high-voltage pole sealing and fastening insulating nut is installed on the high-voltage pole extending at one end, and the high-voltage pole sealing and fastening insulating nut is connected to the connecting boss 9 made of the earth pole body shell through a connecting spring, and the high-voltage pole extending at the other end is sequentially installed with a first high-voltage pole sealing and fastening nut abutting against the end of the insulating support frame and a T-shaped insulating spacer sleeve from the inside to the outside, a flange fixed by the spacer sleeve fastening nut is mounted on the insulating spacer sleeve, the flange is connected to the earth pole body shell through a flange fastening screw, a flange fastening nut 5 is connected to the flange fastening screw, and a second high-voltage pole sealing and fastening nut installed on the high-voltage pole is provided on the outside of the insulating spacer sleeve.

[0027] The earth pole body shell is a stainless steel one-piece structure, which includes an earth pole tube body, an end plate 1 arranged at one end of the earth pole tube body, the outer diameter of the end plate is greater than or equal to the outer diameter of the earth pole tube body, a connecting boss for installing a connecting spring is arranged at the inner middle position of the end plate, and a flange structure with an outward flange is arranged at the other end of the earth pole tube body, and flange holes connected to the flange plate are arranged at intervals on the flange structure, and the air inlet and outlet are arranged at both ends of the tube body of the earth pole tube body. In order to facilitate the application of the alternating electric field, during the specific assembly, a fastening clamp made of a conductive material (such as stainless steel, etc.) can be installed on the outside of the earth pole tube body, and the fastening nut of the fastening clamp is directly grounded or connected to the ground pole of the power supply; the power supply outputs an AC high-voltage signal, wherein the high-voltage pole is connected to the high-voltage pole rod through a wire, and the ground pole is directly grounded or connected to the earth pole body shell.

[0028] The insulating support frame is made of a material with good heat resistance, pressure resistance and insulation properties, such as polytetrafluoroethylene material. It is composed of a disc support part 23 and a cylindrical insertion part 24. A cylindrical insertion part is coaxially arranged at the inner center position of the disc support part. The cylindrical insertion part is inserted into the end of the high-voltage pole tube. Air-passing notches are arranged at intervals on the outer edge of the disc support part, and a through hole for inserting the high-voltage pole is provided in the middle of the cylindrical insertion part.

[0029] The high-voltage pole is made of a conductive material that is as corrosion-resistant as possible, such as stainless steel. In order to facilitate assembly, it is designed as a two-stage structure, that is, it consists of a high-voltage pole body 13 and a high-voltage pole top connection rod body 8. The high-voltage pole body is installed on an insulating support frame. The high-voltage pole body is a structure with an external thread design, which is convenient for connecting the high-voltage pole sealing and fastening insulating nut, the high-voltage connecting spring fastening nut and the high-voltage pole sealing and fastening nut; the high-voltage pole top connection rod body is composed of a top connection disk and a through rod horizontally arranged at the center position of the rear part of the top connection disk. The through rod is a structure with a front end polished rod and a rear end threaded structure. The top connection disk of the high-voltage pole top connection rod body is top-connected to the end face of the high-voltage pole body. The polished rod part of the through rod of the high-voltage pole top connection rod body is installed in an insulating spacer sleeve, and a second high-voltage pole sealing and fastening nut is threadedly connected on the threaded part that passes through the insulating spacer sleeve.

[0030] The two-stage high-voltage pole structure can realize the modular assembly of the sterilization device, that is, the high-voltage pole body is assembled with the insulating medium tube, the high-voltage pole tube, the high-voltage connecting spring, the insulating support frame, the high-voltage pole sealing and fastening insulating nut and the connecting spring to form a sterilization module. When the whole is assembled, the sterilization module is assembled in the ground pole body shell, and then the flange, the insulating spacer sleeve and the second high-voltage pole are assembled, and the second high-voltage pole is connected to the first high-voltage pole. At the same time, this two-stage structure is also convenient for adapting to ground pole body shells of different lengths to meet sterilization requirements.

[0031] The high-voltage connecting spring sheet is formed by bending a spring sheet, and includes a vertical penetration portion 26 and upwardly inclined connecting portions 25 at the upper and lower ends of the vertical penetration portion. The vertical penetration portion is penetrated on the high-voltage pole body of the high-voltage pole through a through-hole arranged in the middle thereof, and high-voltage connecting spring sheet fastening nuts 21 threadedly connected to the high-voltage pole are arranged at both ends of the vertical penetration portion, and the two connecting portions are crimped on the inner wall of the high-voltage pole tube.

[0032] The device also includes a sealing gasket 22, which is sandwiched between the ground body shell and the flange plate to seal the gas. The sealing gasket is sleeved on the insulating spacer sleeve.

[0033] The working principle of the present invention is:

[0034] When the earth electrode shell is forcibly grounded and the high-voltage pole is connected to a high-voltage AC signal, an alternating electric field (hereinafter referred to as an external alternating electric field) is formed in the disinfection air gap. When the external alternating electric field is greater than or equal to 2000V / mm, the air in the disinfection air gap will be ionized to generate plasma. If the gas in the disinfection air gap contains organisms such as bacteria and viruses, in the plasma state, the organisms will react with oxygen in the air to generate carbon dioxide and water, thereby achieving sterilization and disinfection.

[0035] The higher the working frequency, the higher the electric field strength, and the smaller the airflow speed, the higher the single disinfection rate will be. When the frequency of the alternating electric field is 30K Hz, the electric field strength reaches 2200V / mm, and the airflow speed is 3M / S, the single disinfection rate can reach 99.99%.

[0036] The present invention was used to perform a single purification efficiency test on Staphylococcus aureus (CGMCC 1.0089), and the results were as follows:

[0037]

[0038] As can be seen from the above table, after the purification operation was performed on the Staphylococcus aureus (CGMCC 1.0089) in the control group and the test group respectively, the single purification efficiency could reach 99.996% after being sterilized by the sterilization device of the present invention.

[0039] The present invention was used to detect the clearance rate of influenza A virus H1N1 (VR-1469), and the results were as follows:

[0040]

[0041] As can be seen from the above table, the influenza A virus H1N1 (VR-1469) in the control group and the test group were sterilized, and the test group used the sterilization device of the present invention, and after 60 minutes of action, the virus clearance rate of the test group can reach 99.99%.

[0042] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A plasma air sterilization device based on an external alternating electric field, characterized in that: The invention comprises a ground pole body shell, an insulating support frame, an insulating medium tube, a high-voltage pole tube, a high-voltage pole rod, a high-voltage connecting spring sheet, a high-voltage pole sealing and fastening insulating nut, a connecting spring, a first high-voltage pole sealing and fastening nut, an insulating spacer sleeve, a flange, a flange fastening screw, a spacer sleeve fastening nut and a second high-voltage pole sealing and fastening nut. Air inlets and outlets are respectively arranged at both ends of the ground pole body shell. The high-voltage pole tube and the insulating medium tube are nested inside and outside and are coaxially arranged. Both ends of the insulating medium tube are coaxially supported and installed inside the ground pole body shell through insulating support frames. The two insulating support frames are located between the two air inlets and outlets. The gap between the insulating medium tube and the ground pole body shell forms a sterilizing air gap. A high-voltage pole rod is coaxially installed in the high-voltage pole tube. A high-voltage connecting spring sheet is installed on the upper part, and the outer ring of the high-voltage connecting spring sheet abuts on the high-voltage pole tube. Both ends of the high-voltage pole are extended from the insulating support frames at both ends. A high-voltage pole sealing and fastening insulating nut is installed on the high-voltage pole extending at one end, and the high-voltage pole sealing and fastening insulating nut is connected to the earth pole body shell through a connecting spring. The high-voltage pole extending at the other end is sequentially installed with a first high-voltage pole sealing and fastening nut abutting against the end of the insulating support frame and a T-shaped insulating spacer sleeve from the inside to the outside. A flange plate fixed by a spacer sleeve fastening nut is mounted on the insulating spacer sleeve. The flange plate is connected to the earth pole body shell through a flange fastening screw, and a second high-voltage pole sealing and fastening nut installed on the high-voltage pole is provided on the outside of the insulating spacer sleeve.

2. The plasma air sterilization device based on an external alternating electric field according to claim 1, characterized in that: The earth pole body shell is a stainless steel one-piece structure, which includes an earth pole tube body, an end plate arranged at one end of the earth pole tube body, the outer diameter of the end plate is greater than or equal to the outer diameter of the earth pole tube body, a connecting boss for installing a connecting spring is arranged at the middle position of the inner side of the end plate, and a flange structure with an outward flange is provided at the other end of the earth pole tube body, and flange holes connected to the flange plate are arranged at intervals on the flange structure, and the air inlet and outlet are arranged at both ends of the tube body of the earth pole tube body.

3. The plasma air sterilization device based on an applied alternating electric field according to claim 1, characterized in that: The insulating support frame is composed of a disc support part and a cylindrical insertion part. The cylindrical insertion part is coaxially arranged at the inner center position of the disc support part. The cylindrical insertion part is inserted into the end of the high-voltage pole tube. Air-passing notches are arranged at intervals on the outer edge of the disc support part, and a through hole for inserting the high-voltage pole is provided in the middle of the cylindrical insertion part.

4. The plasma air sterilization device based on an external alternating electric field according to claim 1, characterized in that: The high-voltage pole is composed of a high-voltage pole body and a high-voltage pole top connecting rod body. The high-voltage pole body is installed on an insulating support frame, and the high-voltage pole top connecting rod body is installed in an insulating spacer sleeve.

5. The plasma air sterilization device based on an external alternating electric field according to claim 1, characterized in that: The high-voltage connecting spring sheet is formed by bending a spring sheet, and includes a vertical penetration portion and upwardly inclined connecting portions at the upper and lower ends of the vertical penetration portion. The vertical penetration portion is penetrated on the high-voltage pole through a through hole arranged in the middle thereof, and high-voltage connecting spring sheet fastening nuts threadedly connected to the high-voltage pole are arranged at both ends of the vertical penetration portion, and the two connecting portions are crimped on the inner wall of the high-voltage pole tube.

6. The plasma air sterilization device based on an applied alternating electric field according to claim 1, characterized in that: It also includes a sealing gasket, which is sandwiched between the earth pole body shell and the flange, and the sealing gasket is sleeved on the insulating spacer sleeve.

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