Plasma air sterilization device based on external alternating electric field
Through the dielectric barrier discharge structure based on an external alternating electric field and a two-stage high-voltage pole design, the problems of poor sterilization effect and high cost of existing plasma sterilization technology are solved, and an efficient and low-cost air sterilization effect is achieved with a simple structure and easy processing.
Patent Information
- Application Number
- CN202422616058.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-10-29
AI Technical Summary
Existing plasma sterilization technology has problems such as poor sterilization effect, high cost and inconvenient processing. In particular, DC electrostatic field and DC negative high-voltage tip discharge technology have problems of incomplete sterilization and complex processing in actual applications.
It adopts a dielectric barrier discharge structure based on an external alternating electric field and is designed as a two-stage high-voltage pole structure. It uses the alternating electric field to generate plasma in the disinfection air gap, and achieves efficient sterilization through efficient ionized air. Combined with the reasonable layout of stainless steel and insulating materials, a scientific and reasonable device structure is formed.
It achieves an efficient single-time disinfection rate of more than 99.99%, reduces sterilization costs, and has a simple structure, making it easy to process and use.
Smart Images
Figure CN223365948U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of plasma sterilization, in particular to a plasma air sterilization device based on an external alternating electric field. Background Art
[0002] Plasma sterilization technology is a new generation of high-tech sterilization technology. It 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] DC electrostatic field sterilization technology uses negative high voltage to release negative charges into the air to be sterilized. This negative charge adheres to bacteria. When these bacteria pass through the electrostatic field, they are attracted to the positive plate, releasing sterile air. However, due to the limited number of bacteria that can be attracted to the positive plate, this technology has a poor sterilization effect.
[0005] Direct current negative high voltage (tip discharge) sterilization technology: It is necessary to make a tip on the electrode plate, and then apply negative high voltage to make the tip discharge. The electrons released by the tip instantly knock away the outermost electrons of the air, forming 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 effect of sterilization. However, the length of each plasma is limited, and it cannot contact the ground electrode plate, otherwise a short circuit problem will occur. 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 of poor sterilization effect, high cost, and difficulty in implementation in the prior art. Summary of the Invention
[0007] The purpose of the utility model 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, good sterilization effect, low sterilization cost, convenient processing and use, and is easy to implement.
[0008] The utility model 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 electrode shell, an insulating support frame, an insulating medium tube, a high-voltage electrode tube, a high-voltage electrode rod, a high-voltage connecting spring sheet, a high-voltage electrode sealing and fastening insulating nut, a connecting spring, a first high-voltage electrode sealing and fastening nut, an insulating spacer sleeve, a flange, a flange fastening screw, a spacer sleeve fastening nut and a second high-voltage electrode sealing and fastening nut. Air inlets and outlets are respectively provided at both ends of the ground electrode shell. The high-voltage electrode 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 electrode shell by 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 electrode shell forms a disinfection air gap. The shaft is provided with a high-voltage pole, and a high-voltage connecting spring sheet is provided on 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 provided 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 provided 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 electrode shell is a stainless steel one-piece molded structure, which includes an earth electrode tube body, an end plate arranged at one end of the earth electrode tube body, the outer diameter of the end plate is greater than or equal to the outer diameter of the earth electrode 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 electrode tube body, and flange holes connected to the flange plate are arranged at intervals on the flange structure. The air inlet and outlet are arranged at both ends of the tube body of the earth electrode 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 the insulating support frame, and the high-voltage pole top connecting rod body is installed in the 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 provided in the middle thereof, and high-voltage connecting spring sheet fastening nuts threadedly connected to the high-voltage pole are provided 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 includes a sealing gasket, which is sandwiched between the earth electrode shell and the flange, and the sealing gasket is sleeved on the insulating spacer sleeve.
[0015] The advantages and beneficial effects of the utility model are:
[0016] 1. This plasma sterilization device based on an externally applied alternating electric field, by designing 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 AC voltage greater than or equal to 2000V multiplied by the thickness of the disinfection air gap (unit is millimeter), an alternating electric field greater than or equal to 2000v / mm can be formed in the disinfection air gap, and this electric field can ionize the air and generate plasma. When air is passed through the disinfection air gap of this device, under a plasma state, viruses and bacteria in the air will react with the oxygen in the air in an instant, generating carbon dioxide and water, which plays the role of efficient sterilization. The single disinfection rate of the present utility model is greater than 99.99%.
[0017] 2. This plasma air sterilization device based on an external alternating electric field facilitates the assembly of the entire device and improves assembly efficiency by designing the high-voltage pole into a two-section structure consisting of a high-voltage pole body and a second high-voltage pole.
[0018] 3. The structural design of this utility model is scientific and reasonable, and it 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 diagram of the utility model;
[0020] Figure 2 It is a cross-sectional view of the utility model;
[0021] Figure 3 This is a schematic structural diagram of the insulating support frame of the utility model;
[0022] Figure 4 This is a structural diagram of the high-voltage connecting spring sheet of the utility model.
[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 tube, 16-high-voltage pole tube, 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 will be further described in detail below through specific embodiments. The following embodiments are merely illustrative and non-restrictive, and should not be used to limit the scope of protection of the present invention.
[0026] A plasma air sterilization device based on an external alternating electric field, the innovation of which lies in: comprising a ground electrode shell 2, an insulating support frame 12, an insulating medium tube 15, a high-voltage electrode tube 16, a high-voltage electrode rod, a high-voltage connecting spring sheet 14, a high-voltage electrode sealing and fastening insulating nut 11, a connecting spring 10, a first high-voltage electrode 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 electrode sealing and fastening nut 7, air inlets and outlets 3 are respectively provided at both ends of the ground electrode shell for air to enter for sterilization and to be discharged after sterilization, the high-voltage electrode tube and the insulating medium tube are nested inside and outside and coaxially arranged, the insulating medium tube is made of quartz glass, ceramics or other insulating materials, the two ends of the insulating medium tube are coaxially supported and installed inside the ground electrode shell by insulating support frames, the two insulating support frames are located between the two air inlets and outlets, and the insulating medium tube is external to the ground electrode. The gap between the shells forms a sterilization air gap 20, and a high-voltage pole is coaxially installed in the high-voltage pole tube, and a high-voltage connecting spring sheet is installed on the high-voltage pole rod. The outer ring of the high-voltage connecting spring sheet abuts on the high-voltage pole tube, and 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. The high-voltage pole extending at the other end is sequentially installed with a first high-voltage pole sealing and fastening nut abutting the end of the insulating support frame and a T-shaped insulating spacer sleeve from the inside to the outside, and 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, and a flange fastening nut 5 is connected to the 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.
[0027] The earth electrode shell is a stainless steel one-piece structure, which includes an earth electrode tube body, an end plate 1 provided at one end of the earth electrode tube body, the outer diameter of the end plate being greater than or equal to the outer diameter of the earth electrode tube body, a connecting boss for installing a connecting spring provided at the inner middle position of the end plate, an outwardly flanged structure provided at the other end of the earth electrode tube body, flange holes connected to the flange plate provided at intervals on the flange structure, and the air inlet and outlet provided at both ends of the tube body of the earth electrode 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 electrode tube body, and the fastening nut of the fastening clamp is directly grounded or connected to the earth electrode of the power supply; the power supply outputs an AC high-voltage signal, wherein the high-voltage electrode is connected to the high-voltage electrode rod through a wire, and the earth electrode is directly grounded or connected to the earth electrode shell.
[0028] The insulating support frame is made of a material with heat resistance, pressure resistance and good insulation properties, such as polytetrafluoroethylene. It consists 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 and is as corrosion-resistant as possible, such as stainless steel. In order to facilitate assembly, it is designed as a two-section structure, that is, it consists of a high-voltage pole body 13 and a high-voltage pole top connecting rod body 8. The high-voltage pole body is installed on the insulating support frame. The high-voltage pole body has an external threaded structure, which is convenient for connecting the high-voltage pole sealing and fastening insulating nut, the high-voltage connection spring fastening nut and the high-voltage pole sealing and fastening nut; the high-voltage pole top connecting rod body is composed of a top connecting disc and a penetrating rod horizontally arranged at the center position of the rear part of the top connecting disc. The penetrating rod has a structure with a front-end polished rod and a rear-end threaded rod. The top connecting disc of the high-voltage pole top connecting rod body is top-connected to the end face of the high-voltage pole body. The penetrating rod polished rod part of the high-voltage pole top connecting rod body is installed in the insulating spacer sleeve, and the second high-voltage pole sealing and fastening nut is threadedly connected on the threaded part passing through the insulating spacer sleeve.
[0030] This two-stage high-voltage pole structure enables modular assembly of the sterilization device. Specifically, the high-voltage pole body, 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 are assembled into a single unit to form a sterilization module. During overall assembly, the sterilization module is assembled within the pole body housing, followed by the flange, insulating spacer, and second high-voltage pole, which is then connected to the first high-voltage pole via the second high-voltage pole. Furthermore, this two-stage structure facilitates adaption to pole body housings of varying 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 through a through-hole provided in the middle thereof and is installed on the high-voltage pole body of the high-voltage pole. High-voltage connecting spring sheet fastening nuts 21 threadedly connected to the high-voltage pole are provided at both ends of the vertical penetration portion, and the two connecting portions are crimped onto the inner wall of the high-voltage pole tube.
[0032] The device further comprises a sealing gasket 22, which is sandwiched between the earth electrode housing and the flange for sealing the gas. The sealing gasket is sleeved on the insulating spacer sleeve.
[0033] The working principle of this utility model is:
[0034] When the grounding element is forcibly grounded and a high-voltage AC signal is applied to the high-voltage electrode, an alternating electric field (hereinafter referred to as the applied alternating electric field) is formed within the disinfection air gap. When the applied alternating electric field is greater than or equal to 2000V / mm, the air within the disinfection air gap is ionized, generating plasma. If the gas within 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 produce carbon dioxide and water, thereby achieving sterilization.
[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 utility model was used to conduct 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 Staphylococcus aureus (CGMCC 1.0089) in the control group and the test group respectively, the sterilization efficiency of the sterilization device of the present invention could reach 99.996%.
[0039] The present invention was used to test the clearance rate of influenza A virus H1N1 (VR-1469), and the results were as follows:
[0040]
[0041] As can be seen from the table above, the influenza A virus H1N1 (VR-1469) in the control group and the experimental group were sterilized. The experimental group used the sterilization device of the utility model, and after 60 minutes of action, the virus clearance rate could reach 99.99%.
[0042] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will understand that various replacements, 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 utility model comprises a ground electrode shell, an insulating support frame, an insulating medium tube, a high-voltage electrode tube, a high-voltage electrode rod, a high-voltage connecting spring sheet, a high-voltage electrode sealing and fastening insulating nut, a connecting spring, a first high-voltage electrode sealing and fastening nut, an insulating spacer sleeve, a flange, a flange fastening screw, a spacer sleeve fastening nut and a second high-voltage electrode sealing and fastening nut. Air inlets and outlets are respectively provided at both ends of the ground electrode shell. The high-voltage electrode tube and the insulating medium tube are nested inside and outside and coaxially arranged. Both ends of the insulating medium tube are coaxially supported and installed inside the ground electrode shell by 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 electrode shell forms a sterilization air gap. A high-voltage electrode rod is coaxially installed in the high-voltage electrode 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 against the high-voltage electrode tube. Both ends of the high-voltage electrode extend from the insulating support frames at both ends. A high-voltage electrode sealing and fastening insulating nut is installed on the high-voltage electrode extending at one end, and the high-voltage electrode sealing and fastening insulating nut is connected to the earth electrode body shell through a connecting spring. The high-voltage electrode extending at the other end is sequentially installed with a first high-voltage electrode 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 electrode body shell through a flange fastening screw. A second high-voltage electrode sealing and fastening nut installed on the high-voltage electrode 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 electrode shell is a one-piece stainless steel structure, which includes an earth electrode tube body, an end plate arranged at one end of the earth electrode tube body, the outer diameter of the end plate is greater than or equal to the outer diameter of the earth electrode tube body, a connecting boss for installing a connecting spring is arranged in the middle position of the inner side of the end plate, and an outward-flange structure is provided at the other end of the earth electrode tube body. 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 electrode tube body.
3. The plasma air sterilization device based on an external 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 provided in the middle thereof. High-voltage connecting spring sheet fastening nuts threadedly connected to the high-voltage pole are provided 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 external alternating electric field according to claim 1, characterized in that: It also includes a sealing gasket, which is sandwiched between the earth pole shell and the flange, and the sealing gasket is sleeved on the insulating spacer sleeve.