CN111417247A - Contact intelligent plasma surface discharge device - Google Patents
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- CN111417247A CN111417247A CN202010207782.1A CN202010207782A CN111417247A CN 111417247 A CN111417247 A CN 111417247A CN 202010207782 A CN202010207782 A CN 202010207782A CN 111417247 A CN111417247 A CN 111417247A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/2406—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/0006—Investigating plasma, e.g. measuring the degree of ionisation or the electron temperature
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Abstract
The invention provides a contactable intelligent plasma creeping discharge device which can simply, conveniently and controllably generate atmospheric pressure low-temperature plasma. The creeping discharge device comprises an insulating shell, and a control board card, a high-voltage module, a heat dissipation module, a plasma generation module and a monitoring module which are packaged in the insulating shell; the input end of the high-voltage module is connected with a standard commercial power, and the output end of the high-voltage module is divided into a high-voltage electrode and a ground electrode and used for providing the required high voltage for the plasma generation module; the heat dissipation module is arranged on the surface of the high-voltage module in a close manner; the monitoring module is used for acquiring the temperature of the high-voltage module, the concentration information of environmental ozone and nitrogen oxide in real time and sending the temperature information to the control board card; the control board card is used for controlling the high-voltage module to drive the plasma generation module to work at regular time and controlling the heat dissipation module to work through temperature negative feedback.
Description
Technical Field
The invention belongs to the technical field of electrical engineering, and relates to a plasma creeping discharge device.
Background
The main current sterilization methods are mainly classified into mechanical sterilization, thermal sterilization, flowing steam sterilization, high-pressure steam sterilization, dry heat sterilization and the like, and the chemical sterilization methods are classified into methods for sterilization by using a coagulating protein disinfectant, a dissolving protein disinfectant, an oxidized protein disinfectant, a cationic surfactant, an alkylating disinfectant and other sterilizing agents such as chlorides according to the action type on pathogen proteins. However, there are significant limitations to either physical sterilization, such as mechanical sterilization and thermal sterilization, which involve the risk that the conditions of use may damage the delicate instruments, with the attendant risk of excessive temperatures and unsafe use. The chemical disinfection method can leave corresponding chemical substances on the surface of the disinfected object, potential chemical risks can exist when medical instruments are used subsequently, part of chemical reagents are difficult to degrade, and the environment can be polluted. Therefore, there is a need in both the scientific and industrial fields for an effective and residue-free disinfection method.
The low-temperature plasma sterilization technology is mainly suitable for sterilization of medical instruments and articles which cannot resist damp and heat, and the like, and the result proves that the technology can effectively reduce the probability of infection of patients due to instruments and the infection rate of hospitals and has very important significance in clinical applicationAnd the electrical conductivity of water are important factors affecting the plasma sterilization efficiency. In addition, they have found that the important reason for plasma sterilization is NO through measurement of ultraviolet emission spectrum and sterilization effect in an underwater quartz tubeβAnd NOγThe third medical university of military Pan Keli, etc. utilizes the principle of plasma sterilization and disinfection to make a multifunctional sterilizer integrating air disinfection, water body disinfection and object surface disinfection into one body, and finds that under the condition of 50% -55% humidity, the three-in-one plasma sterilizer opens an air disinfection component to sterilize for 60min, and the killing rate of white staphylococcus in the air of an aerosol cabinet is higher than 99.90%, and in a simulated polluted water body box (80L), the temperature is 20-25 ℃, the escherichia coli pollution (the concentration of bacteria in the water body is 10)4cfu/ml), the water disinfection component of the plasma sterilizer can reduce the colibacillus in 80L contaminated water to 0cfu/100ml (the killing rate reaches 100%) after running for 10min, and for a water body (500ml, the virus content is more than 5 log levels) environment simulating contaminated poliovirus, the switch of the water disinfection component is started to treat for 10min, 20min and 30min respectively, the virus killing log values are 3.25, 4.5 and 5.25 respectively, in a surface disinfection test, the plasma surface disinfection is started for 30s, the killing rate of the colibacillus and staphylococcus aureus at a position 4.5mm away from the surface of the discharge device reaches 100%, and the killing rate of the bacillus subtilis reaches 100% after 180s disinfection treatment.
The use of atmospheric pressure cold plasma for sterilization and disinfection is generally divided into two aspects in industry, one is for in vitro sterilization, including sterilization of the environment, sterilization of food, sterilization of medical instruments and the like, wherein the sterilization of medical instruments needs to reach sterility as-guarantee level (SA L)<10-6) Namely: allowing only no more than one part per million of microorganisms to survive; secondly, for in vivo sterilization, in particular for anti-infection in clinical treatments, which requires that the plasma has a good selective biological effect, namely: high sterilizing effect and no damage to normal body cells.
Research finds that the atmospheric pressure cold plasma has three advantages for sterilizing the medical instruments:
(1) the antibacterial agent has broad-spectrum antibacterial property, and generally only needs a few minutes to reach the sterility assurance level;
(2) the characteristic that the temperature of the plasma gas is close to the room temperature enables the plasma gas to be used for sterilizing heat-sensitive materials, thereby being hopeful to greatly reduce the usage amount of disposable medical materials and reducing the medical cost;
(3) can effectively inactivate biological substances with strong resistance, including super bacteria with strong drug resistance, prion with strong temperature resistance, bacterial biomembranes with group protection function, and the like.
Traditional pharmaceutical antibiotics have faced serious crisis: on one hand, superbacteria with extremely strong drug resistance are emerging continuously, on the other hand, the research and development difficulty of drug antibiotics is getting bigger and bigger, new drugs are getting fewer, and the crisis of antibiotics becomes one of the most serious challenges facing modern medicine. Research shows that the atmospheric pressure cold plasma can sterilize efficiently in a proper dosage range without damaging body cells, which makes the atmospheric pressure cold plasma expected to become a novel 'plasma antibiotic'. Since plasma sterilization is a synergistic effect of many processes, its chemical activity varies widely and is easy to regulate, and thus, it is difficult for microorganisms to develop "resistance" to plasma. That is to say, the plasma antibiotics are expected to assist or replace the existing drug antibiotics, and become a new defense line for guarding human health.
In addition, the literature suggests that plasma has the effect of promoting wound healing and coagulation. Common wounds can be divided into acute wounds and chronic wounds according to the healing speed, and the treatment of the wounds comprises several links of hemostasis, infection resistance, healing promotion and the like, which can be realized by the atmospheric pressure cold plasma. While hemostasis is the most important segment of acute wound treatment, studies have found that atmospheric cold plasma can rapidly coagulate blood with a very thin crust thickness, which is ideal for thin-walled structural tissues (e.g., respiratory and esophageal regions). The blood coagulation device developed based on the technology can be powered by a battery and carried about, and is convenient for outdoor use. Since chronic wounds are the result of prolonged ischemic hypoxia, and are often associated with profound infections, the healing period can sometimes be as long as several months or even over a year.
The use of atmospheric cold plasma for the treatment of chronic wounds has at least two effects:
(1) eliminating wound infection: bacterial biofilms are found in 60% of chronic wounds, which can delay or even prevent wound healing, and plasma can effectively inactivate biofilms and eliminate wound infection.
(2) The healing speed is improved: the atmospheric pressure cold plasma can promote the proliferation of skin cells such as fibroblasts, blood vessel inner wall cells and the like, which is proved in-vitro cell experiments and in-vivo experiments.
Research reports that the main factor for improving the healing speed of the chronic wound by the plasma is NO in the plasma, and the NO can improve the healing speed of the chronic wound by more than 30%. At present, the chronic wound treatment by the atmospheric pressure cold plasma is in the research stage of the clinical II stage, more than 1300 times of treatment are already carried out on more than 150 patients with skin chronic ulcer, and the effect is good so far.
Therefore, the low-temperature plasma is a novel effective sterilization and disinfection means, has effective killing effect on various bacteria and viruses under the condition of gas or liquid, and has the killing efficiency of over 99 percent under the condition of proper discharge. The important mechanism of plasma sterilization is obtained by measuring the sterilization effect in the ultraviolet emission spectrum and the underwater quartz tube and is NOβAnd NOγUltraviolet radiation generated by free radicals.
At present, the existing plasma surface discharge device has single function and high overall power consumption, and is not beneficial to commercialization.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a contactable intelligent plasma creeping discharge device which can simply, conveniently and controllably generate atmospheric pressure low-temperature plasma.
The technical scheme provided by the invention is as follows:
a contactable intelligent plasma creeping discharge device is characterized in that: the plasma monitoring device comprises an insulating shell, and a control board card, a high-voltage module, a heat dissipation module, a plasma generation module and a monitoring module which are packaged in the insulating shell;
the plasma generating module adopts a creeping discharge structure;
the input end of the high-voltage module is connected with a standard commercial power, and the output end of the high-voltage module is divided into a high-voltage electrode and a ground electrode and used for providing the required high voltage for the plasma generation module;
the heat dissipation module is arranged on the surface of the high-voltage module in a close manner;
the monitoring module is used for acquiring the temperature of the high-voltage module, the concentration information of environmental ozone and nitrogen oxide in real time and sending the temperature information to the control board card;
the control board card is used for controlling the high-voltage module to drive the plasma generation module to work at regular time and controlling the heat dissipation module to work through temperature negative feedback.
Based on the above scheme, the application further performs the following important optimization:
furthermore, the main body of the plasma generation module is formed by sequentially laminating a stainless steel hexagonal grid, ceramic plates and copper foils, and is arranged in an insulating shell with a window frame on one surface for pressing, and the window frame is pressed on the edge of the stainless steel hexagonal grid; the stainless steel hexagonal grids are connected to the binding posts corresponding to the ground electrodes through the conducting wires, and the copper foils are connected to the binding posts corresponding to the high-voltage electrodes through the conducting wires.
Further, the heat dissipation module is an air cooling module (for example, a conventional small fan may be used).
Further, the control board controls the heat dissipation module to work through temperature negative feedback, specifically, the highest temperature T allowing the high-voltage module to work is set1And a minimum temperature T2When the temperature is higher than the maximum temperature T1When the high-voltage module is used, the heat dissipation module is controlled to start working and dissipate heat for the high-voltage module; when the temperature is lower than the minimum temperature T2And when the heat dissipation module stops working, controlling the heat dissipation module to stop working.
Furthermore, the control board card realizes the functions of presetting working time, controlling an on-off circuit at preset time or temperature feedback and displaying working time/remaining time through the relay control module.
Furthermore, the control board card is provided with a nixie tube and is used for displaying set time and residual time; the control board card is also externally connected with a membrane switch for realizing the function of inputting preset time.
Furthermore, the monitoring module comprises a temperature sensor, an ozone and nitrogen oxide sensor, a single chip microcomputer and a display screen for displaying the data measured by the sensors.
Furthermore, the single chip microcomputer is preset with threshold values of temperature, ozone and nitrogen oxide concentration, and when the measured data of any sensor exceeds the threshold values in the using process, an alarm is given out.
Furthermore, the control board card, the high-voltage module, the heat dissipation module, the plasma generation module and the monitoring module are packaged in the insulating shell in a layered mode, and a line interface, a user operation unit interface and a display screen interface are reserved on the insulating shell.
Compared with the prior art, the invention has the following beneficial effects:
the invention utilizes commercial power drive and is provided with the heat dissipation module controlled by temperature negative feedback, thereby avoiding unnecessary power loss; the insulating shell is adopted for packaging, so that the safety problem that the high-voltage plasma device is contacted with an organism is solved; the gas sensor module provides a real-time monitoring function of the creeping discharge process, ensures that the fluctuation of discharge products (mainly the concentration of ozone and nitrogen oxides) in the whole using process is in a reasonable range, and also avoids the influence on an experimental result caused by the aging of a dielectric plate due to the long-term use of the creeping discharge device.
The adjustable knob reserved interfaces of the gas sensor and the timing module provide good human-computer interaction experience, so that the device can meet different scientific research and medical requirements.
The device has a timing control function, can set the discharge time and display the discharge remaining time, and is convenient for a user to manage and intuitively operate.
The invention can be used for various application occasions such as disinfection and hemostasis of wound surfaces and disinfection of various instruments such as medical instruments.
Drawings
FIG. 1 is a schematic diagram of the connection of components of one embodiment of the present invention.
Fig. 2 is a schematic diagram of a timer board implementation.
Fig. 3 is a schematic diagram of a plasma generation module, wherein a is a front schematic diagram and b is a back schematic diagram.
Fig. 4 is a photograph showing the actual effect of plasma generated after power is turned on.
FIG. 5 is a schematic layout of the components of the apparatus; in the figure, 1 is a timer module, 2 is a monitoring module, 3 is a high voltage module, 4 is a heat dissipation fan, and 5 is a plasma generation module.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
The embodiment utilizes the high-voltage module to drive the plasma generation module to generate plasma, the temperature module with negative feedback is used for controlling the fan to dissipate heat for the high-voltage module, the device is internally and additionally provided with the sensors capable of monitoring the concentration and the temperature of ozone and nitric oxide, the discharge state is monitored by monitoring discharge products constantly, and finally, the timer is additionally arranged at the 220V power supply end of the whole device and is used for controlling the single working time of the contactable intelligent plasma surface discharge device.
Fig. 1 is a schematic connection diagram of the contactable intelligent plasma creeping discharge device, and the whole device is divided into four parts, namely a timer module, a high-voltage module (including an air cooling module), a plasma generating module and a monitoring module, and is packaged in a photosensitive resin shell for 3D printing.
The functional requirements of the timer module are: the relay control module is used for presetting working time, switching on and switching off the circuit at preset time and displaying the residual time by the nixie tube. The board card design is carried out through analyzing the functional requirements of the relay control module, the board card comprises a hardware board card and MCU software, a complete digital system hardware control platform is formed, and various functional requirements of the relay control module are met. The board card adopts MCU (STM32F217VGT6) as the core control component of the control module of the relay, and the specified functions of the module are realized by matching with other module circuits. The board card divides into from the function: MCU module, charactron display module, button control module, relay module and clock, power, reset module etc.. A block diagram of the overall implementation of the board card is shown in fig. 2.
As shown in fig. 2, the relay control module is provided by a 12V dc power input, and a power module converts the 12V dc voltage into a 3.3V dc voltage to power the MCU module. The MCU module mainly accomplishes the following two functions: 1) and (3) digital display: the output of the MCU module is connected to the two nixie tubes, and the two seven-pin nixie tubes of minutes and seconds are respectively controlled to display the set time and the residual time. 2) Controlling the on-off: the other output of the MCU module is connected to the relay through an NMOS tube and is used for controlling the relay to open and close the circuit at the set time. The relay is connected on the series circuit of the main circuit and used for controlling the on-off of the subsequent creeping discharge device.
Besides the control function, the board card is also externally connected with a membrane switch for realizing the function of inputting preset time. The switch is mainly used for parameter setting and display control operation, and has the following specific functions: a) setting a button: setting the time displayed by a nixie tube and the action time of a relay; b) a cancel button: realizing zero resetting of the nixie tube and disconnection of the relay; c) numerical +/-operation: the +1 operation and the-1 operation of the corresponding digit tube are realized through a button; d) switching nixie tube positions: when parameters are set, nixie tube position switching operation is realized; the button can replace functions with a setting button, but the software design is relatively complex and is not as simple as hardware switching.
The high voltage module mainly functions to provide the voltage required for discharging for the plasma generation module, and an integrated small-sized step-up transformer is adopted in the embodiment. The low-voltage side is directly connected to 220V mains supply through a plug, and the black and red output terminals of the high-voltage side are respectively a grounded ground electrode and a high-voltage electrode with the output voltage of 6 kV.
At present, the actual output of two output ends of a common miniaturized high-voltage module is high voltage to the ground, taking a certain high-voltage module as an example, the external dimension of the high-voltage module is 50mm × 85mm × 30mm, 220V and 50Hz alternating current input, the output is similar to sine wave, the waveform is in a sawtooth shape, the peak value of one output end is 3.1kV, the peak value of the other output end is 2.9kV, the output frequencies of two ends are the same and are about 15kHz, the directions are opposite, if the potential of a ground electrode is always regarded as zero potential, the high-voltage electrode can be regarded as a high-voltage high-frequency power supply with the frequency of 15kHz and the peak value of 6 kV.
The high-voltage module can support 90W power to operate for 5min under the condition that a radiating fan is not additionally arranged, the temperature rise can reach 130 ℃, after the radiating fan is additionally arranged as an air cooling module, if the temperature rise of the high-voltage module can be maintained to be not more than 60 ℃, the high-voltage module can operate for 24 hours without stop, and the working efficiency is improved.
The heat radiation fan can be used as an air cooling module and additionally arranged on the high-voltage module to cool the high-voltage module. Because the high-voltage module is internally provided with the aluminum radiating fin, heat is transferred to the shell from the inside of the high-voltage module, and the fan is just required to be over against the aluminum radiating fin and is fixed at the shell during installation. The temperature module with negative feedback regulation can set the maximum temperature T that allows the high voltage module to operate1And a minimum temperature T2When the module temperature is higher than the maximum temperature T1When the control circuit is closed, the fan starts to work to radiate heat of the high-voltage module; when the module temperature is lower than the minimum temperature T2When the temperature control circuit is switched off, the fan stops working, and negative feedback adjustment of the temperature is achieved.
The plasma is mainly generated by a plasma generation module, the plasma generation module is formed by a sandwich structure formed by stainless steel hexagonal grids, ceramic plates and copper foils, the sandwich structure is compressed by a shell formed by 3D printing of photosensitive resin materials, the stainless steel grids are connected to the binding posts corresponding to the ground electrodes, the copper foils are connected to the binding posts corresponding to the high-voltage electrodes, and the plasma generation module is formed as shown in figure 3.
Through separating a safe distance with the discharge area of ground electrode and outside, effectively avoid the user to touch by mistake or cause the electric shock or the short circuit with the contact of terminal surface, improved the security, also be favorable to lasting stable work.
After applying a high voltage to the posts, the plasma is generated as shown in fig. 4, and the resulting plasma is in the stainless steel mesh in the figure. And because the stainless steel copper mesh is the grounding electrode, the generated plasma can safely contact the human body and other organisms, and has a wide prospect in the biological application of sterilization and wound hemostasis.
The monitoring module mainly comprises an ozone, temperature and nitrogen oxide sensor and a 51 single chip microcomputer, the L CD1602 liquid crystal display is used for displaying the current concentration of ozone, temperature and nitrogen oxide, a button interaction function is not provided, and only the function of monitoring the whole discharging device is provided.
Finally, the modules are packaged in a 3D printing shell as shown in fig. 5 in a layered mode, and an adjustable timing button (membrane switch) interface and a screen display interface are reserved.
Claims (9)
1. Can contact intelligent plasma creeping discharge device, its characterized in that: the plasma monitoring device comprises an insulating shell, and a control board card, a high-voltage module, a heat dissipation module, a plasma generation module and a monitoring module which are packaged in the insulating shell;
the plasma generating module adopts a creeping discharge structure;
the input end of the high-voltage module is connected with a standard commercial power, and the output end of the high-voltage module is divided into a high-voltage electrode and a ground electrode and used for providing the required high voltage for the plasma generation module;
the heat dissipation module is arranged on the surface of the high-voltage module in a close manner;
the monitoring module is used for acquiring the temperature of the high-voltage module, the concentration information of environmental ozone and nitrogen oxide in real time and sending the temperature information to the control board card;
the control board card is used for controlling the high-voltage module to drive the plasma generation module to work at regular time and controlling the heat dissipation module to work through temperature negative feedback.
2. The contactable intelligent plasma creeping discharge device according to claim 1, wherein: the main body of the plasma generation module is formed by sequentially laminating a stainless steel hexagonal grid, a ceramic plate and a copper foil, and is loaded into an insulating shell with a window frame on one surface for pressing, and the window frame is pressed on the edge of the stainless steel hexagonal grid; the stainless steel hexagonal grids are connected to the binding posts corresponding to the ground electrodes through the conducting wires, and the copper foils are connected to the binding posts corresponding to the high-voltage electrodes through the conducting wires.
3. The contactable intelligent plasma creeping discharge device according to claim 1, wherein: the heat dissipation module is an air cooling module.
4. The contactable intelligent plasma creeping discharge device according to claim 1, wherein: the control board card controls the heat dissipation module to work through temperature negative feedback, specifically, the highest temperature T allowing the high-voltage module to work is set1And a minimum temperature T2When the temperature is higher than the maximum temperature T1When the high-voltage module is used, the heat dissipation module is controlled to start working and dissipate heat for the high-voltage module; when the temperature is lower than the minimum temperature T2And when the heat dissipation module stops working, controlling the heat dissipation module to stop working.
5. The contactable intelligent plasma creeping discharge device according to claim 1, wherein: the control board card realizes the functions of presetting working time, controlling the on-off circuit at preset time or temperature feedback and displaying the working time/residual time through the relay control module.
6. The contactable intelligent plasma creeping discharge device according to claim 5, wherein: the control board card is provided with a nixie tube and is used for displaying set time and residual time; the control board card is also externally connected with a membrane switch for realizing the function of inputting preset time.
7. The contactable intelligent plasma creeping discharge device according to claim 1, wherein: the monitoring module comprises a temperature sensor, an ozone and nitrogen oxide sensor, a single chip microcomputer and a display screen for displaying the measured data of the sensors.
8. The contactable intelligent plasma creeping discharge device according to claim 7, wherein: the single chip microcomputer is preset with threshold values of temperature, ozone and nitrogen oxide concentration, and when the measured data of any sensor exceeds the threshold values in the using process, an alarm is given out.
9. The contactable intelligent plasma creeping discharge device according to claim 1, wherein: the control board card, the high-voltage module, the heat dissipation module, the plasma generation module and the monitoring module are packaged in the insulating shell in a layered mode, and a line interface, a user operation unit interface and a display screen interface are reserved on the insulating shell.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113225888A (en) * | 2021-05-28 | 2021-08-06 | 南京苏曼等离子工程研究院有限公司 | Low-temperature plasma airflow generator |
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